diff options
Diffstat (limited to 'drivers/nvme')
30 files changed, 27887 insertions, 0 deletions
diff --git a/drivers/nvme/Kconfig b/drivers/nvme/Kconfig new file mode 100644 index 000000000..04008e0bb --- /dev/null +++ b/drivers/nvme/Kconfig @@ -0,0 +1,6 @@ +menu "NVME Support" + +source "drivers/nvme/host/Kconfig" +source "drivers/nvme/target/Kconfig" + +endmenu diff --git a/drivers/nvme/Makefile b/drivers/nvme/Makefile new file mode 100644 index 000000000..0096a7fd1 --- /dev/null +++ b/drivers/nvme/Makefile @@ -0,0 +1,3 @@ + +obj-y += host/ +obj-y += target/ diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig new file mode 100644 index 000000000..88a8b5916 --- /dev/null +++ b/drivers/nvme/host/Kconfig @@ -0,0 +1,59 @@ +config NVME_CORE + tristate + +config BLK_DEV_NVME + tristate "NVM Express block device" + depends on PCI && BLOCK + select NVME_CORE + ---help--- + The NVM Express driver is for solid state drives directly + connected to the PCI or PCI Express bus. If you know you + don't have one of these, it is safe to answer N. + + To compile this driver as a module, choose M here: the + module will be called nvme. + +config NVME_MULTIPATH + bool "NVMe multipath support" + depends on NVME_CORE + ---help--- + This option enables support for multipath access to NVMe + subsystems. If this option is enabled only a single + /dev/nvmeXnY device will show up for each NVMe namespaces, + even if it is accessible through multiple controllers. + +config NVME_FABRICS + tristate + +config NVME_RDMA + tristate "NVM Express over Fabrics RDMA host driver" + depends on INFINIBAND && INFINIBAND_ADDR_TRANS && BLOCK + select NVME_CORE + select NVME_FABRICS + select SG_POOL + help + This provides support for the NVMe over Fabrics protocol using + the RDMA (Infiniband, RoCE, iWarp) transport. This allows you + to use remote block devices exported using the NVMe protocol set. + + To configure a NVMe over Fabrics controller use the nvme-cli tool + from https://github.com/linux-nvme/nvme-cli. + + If unsure, say N. + +config NVME_FC + tristate "NVM Express over Fabrics FC host driver" + depends on BLOCK + depends on HAS_DMA + select NVME_CORE + select NVME_FABRICS + select SG_POOL + help + This provides support for the NVMe over Fabrics protocol using + the FC transport. This allows you to use remote block devices + exported using the NVMe protocol set. + + To configure a NVMe over Fabrics controller use the nvme-cli tool + from https://github.com/linux-nvme/nvme-cli. + + If unsure, say N. diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile new file mode 100644 index 000000000..aea459c65 --- /dev/null +++ b/drivers/nvme/host/Makefile @@ -0,0 +1,23 @@ +# SPDX-License-Identifier: GPL-2.0 + +ccflags-y += -I$(src) + +obj-$(CONFIG_NVME_CORE) += nvme-core.o +obj-$(CONFIG_BLK_DEV_NVME) += nvme.o +obj-$(CONFIG_NVME_FABRICS) += nvme-fabrics.o +obj-$(CONFIG_NVME_RDMA) += nvme-rdma.o +obj-$(CONFIG_NVME_FC) += nvme-fc.o + +nvme-core-y := core.o +nvme-core-$(CONFIG_TRACING) += trace.o +nvme-core-$(CONFIG_NVME_MULTIPATH) += multipath.o +nvme-core-$(CONFIG_NVM) += lightnvm.o +nvme-core-$(CONFIG_FAULT_INJECTION_DEBUG_FS) += fault_inject.o + +nvme-y += pci.o + +nvme-fabrics-y += fabrics.o + +nvme-rdma-y += rdma.o + +nvme-fc-y += fc.o diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c new file mode 100644 index 000000000..a0a805a5a --- /dev/null +++ b/drivers/nvme/host/core.c @@ -0,0 +1,3875 @@ +/* + * NVM Express device driver + * Copyright (c) 2011-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/blkdev.h> +#include <linux/blk-mq.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/hdreg.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/list_sort.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/pr.h> +#include <linux/ptrace.h> +#include <linux/nvme_ioctl.h> +#include <linux/t10-pi.h> +#include <linux/pm_qos.h> +#include <asm/unaligned.h> + +#define CREATE_TRACE_POINTS +#include "trace.h" + +#include "nvme.h" +#include "fabrics.h" + +#define NVME_MINORS (1U << MINORBITS) + +unsigned int admin_timeout = 60; +module_param(admin_timeout, uint, 0644); +MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); +EXPORT_SYMBOL_GPL(admin_timeout); + +unsigned int nvme_io_timeout = 30; +module_param_named(io_timeout, nvme_io_timeout, uint, 0644); +MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); +EXPORT_SYMBOL_GPL(nvme_io_timeout); + +static unsigned char shutdown_timeout = 5; +module_param(shutdown_timeout, byte, 0644); +MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown"); + +static u8 nvme_max_retries = 5; +module_param_named(max_retries, nvme_max_retries, byte, 0644); +MODULE_PARM_DESC(max_retries, "max number of retries a command may have"); + +static unsigned long default_ps_max_latency_us = 100000; +module_param(default_ps_max_latency_us, ulong, 0644); +MODULE_PARM_DESC(default_ps_max_latency_us, + "max power saving latency for new devices; use PM QOS to change per device"); + +static bool force_apst; +module_param(force_apst, bool, 0644); +MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off"); + +static bool streams; +module_param(streams, bool, 0644); +MODULE_PARM_DESC(streams, "turn on support for Streams write directives"); + +/* + * nvme_wq - hosts nvme related works that are not reset or delete + * nvme_reset_wq - hosts nvme reset works + * nvme_delete_wq - hosts nvme delete works + * + * nvme_wq will host works such are scan, aen handling, fw activation, + * keep-alive error recovery, periodic reconnects etc. nvme_reset_wq + * runs reset works which also flush works hosted on nvme_wq for + * serialization purposes. nvme_delete_wq host controller deletion + * works which flush reset works for serialization. + */ +struct workqueue_struct *nvme_wq; +EXPORT_SYMBOL_GPL(nvme_wq); + +struct workqueue_struct *nvme_reset_wq; +EXPORT_SYMBOL_GPL(nvme_reset_wq); + +struct workqueue_struct *nvme_delete_wq; +EXPORT_SYMBOL_GPL(nvme_delete_wq); + +static DEFINE_IDA(nvme_subsystems_ida); +static LIST_HEAD(nvme_subsystems); +static DEFINE_MUTEX(nvme_subsystems_lock); + +static DEFINE_IDA(nvme_instance_ida); +static dev_t nvme_chr_devt; +static struct class *nvme_class; +static struct class *nvme_subsys_class; + +static void nvme_ns_remove(struct nvme_ns *ns); +static int nvme_revalidate_disk(struct gendisk *disk); +static void nvme_put_subsystem(struct nvme_subsystem *subsys); +static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, + unsigned nsid); + +static void nvme_set_queue_dying(struct nvme_ns *ns) +{ + /* + * Revalidating a dead namespace sets capacity to 0. This will end + * buffered writers dirtying pages that can't be synced. + */ + if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags)) + return; + blk_set_queue_dying(ns->queue); + /* Forcibly unquiesce queues to avoid blocking dispatch */ + blk_mq_unquiesce_queue(ns->queue); + /* + * Revalidate after unblocking dispatchers that may be holding bd_butex + */ + revalidate_disk(ns->disk); +} + +static void nvme_queue_scan(struct nvme_ctrl *ctrl) +{ + /* + * Only new queue scan work when admin and IO queues are both alive + */ + if (ctrl->state == NVME_CTRL_LIVE) + queue_work(nvme_wq, &ctrl->scan_work); +} + +int nvme_reset_ctrl(struct nvme_ctrl *ctrl) +{ + if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) + return -EBUSY; + if (!queue_work(nvme_reset_wq, &ctrl->reset_work)) + return -EBUSY; + return 0; +} +EXPORT_SYMBOL_GPL(nvme_reset_ctrl); + +int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl) +{ + int ret; + + ret = nvme_reset_ctrl(ctrl); + if (!ret) { + flush_work(&ctrl->reset_work); + if (ctrl->state != NVME_CTRL_LIVE && + ctrl->state != NVME_CTRL_ADMIN_ONLY) + ret = -ENETRESET; + } + + return ret; +} +EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync); + +static void nvme_delete_ctrl_work(struct work_struct *work) +{ + struct nvme_ctrl *ctrl = + container_of(work, struct nvme_ctrl, delete_work); + + dev_info(ctrl->device, + "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn); + + flush_work(&ctrl->reset_work); + nvme_stop_ctrl(ctrl); + nvme_remove_namespaces(ctrl); + ctrl->ops->delete_ctrl(ctrl); + nvme_uninit_ctrl(ctrl); + nvme_put_ctrl(ctrl); +} + +int nvme_delete_ctrl(struct nvme_ctrl *ctrl) +{ + if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING)) + return -EBUSY; + if (!queue_work(nvme_delete_wq, &ctrl->delete_work)) + return -EBUSY; + return 0; +} +EXPORT_SYMBOL_GPL(nvme_delete_ctrl); + +int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl) +{ + int ret = 0; + + /* + * Keep a reference until the work is flushed since ->delete_ctrl + * can free the controller. + */ + nvme_get_ctrl(ctrl); + ret = nvme_delete_ctrl(ctrl); + if (!ret) + flush_work(&ctrl->delete_work); + nvme_put_ctrl(ctrl); + return ret; +} +EXPORT_SYMBOL_GPL(nvme_delete_ctrl_sync); + +static inline bool nvme_ns_has_pi(struct nvme_ns *ns) +{ + return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple); +} + +static blk_status_t nvme_error_status(struct request *req) +{ + switch (nvme_req(req)->status & 0x7ff) { + case NVME_SC_SUCCESS: + return BLK_STS_OK; + case NVME_SC_CAP_EXCEEDED: + return BLK_STS_NOSPC; + case NVME_SC_LBA_RANGE: + return BLK_STS_TARGET; + case NVME_SC_BAD_ATTRIBUTES: + case NVME_SC_ONCS_NOT_SUPPORTED: + case NVME_SC_INVALID_OPCODE: + case NVME_SC_INVALID_FIELD: + case NVME_SC_INVALID_NS: + return BLK_STS_NOTSUPP; + case NVME_SC_WRITE_FAULT: + case NVME_SC_READ_ERROR: + case NVME_SC_UNWRITTEN_BLOCK: + case NVME_SC_ACCESS_DENIED: + case NVME_SC_READ_ONLY: + case NVME_SC_COMPARE_FAILED: + return BLK_STS_MEDIUM; + case NVME_SC_GUARD_CHECK: + case NVME_SC_APPTAG_CHECK: + case NVME_SC_REFTAG_CHECK: + case NVME_SC_INVALID_PI: + return BLK_STS_PROTECTION; + case NVME_SC_RESERVATION_CONFLICT: + return BLK_STS_NEXUS; + default: + return BLK_STS_IOERR; + } +} + +static inline bool nvme_req_needs_retry(struct request *req) +{ + if (blk_noretry_request(req)) + return false; + if (nvme_req(req)->status & NVME_SC_DNR) + return false; + if (nvme_req(req)->retries >= nvme_max_retries) + return false; + return true; +} + +void nvme_complete_rq(struct request *req) +{ + blk_status_t status = nvme_error_status(req); + + trace_nvme_complete_rq(req); + + if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) { + if ((req->cmd_flags & REQ_NVME_MPATH) && nvme_failover_req(req)) + return; + + if (!blk_queue_dying(req->q)) { + nvme_req(req)->retries++; + blk_mq_requeue_request(req, true); + return; + } + } + blk_mq_end_request(req, status); +} +EXPORT_SYMBOL_GPL(nvme_complete_rq); + +void nvme_cancel_request(struct request *req, void *data, bool reserved) +{ + dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device, + "Cancelling I/O %d", req->tag); + + nvme_req(req)->status = NVME_SC_ABORT_REQ; + blk_mq_complete_request(req); + +} +EXPORT_SYMBOL_GPL(nvme_cancel_request); + +bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, + enum nvme_ctrl_state new_state) +{ + enum nvme_ctrl_state old_state; + unsigned long flags; + bool changed = false; + + spin_lock_irqsave(&ctrl->lock, flags); + + old_state = ctrl->state; + switch (new_state) { + case NVME_CTRL_ADMIN_ONLY: + switch (old_state) { + case NVME_CTRL_CONNECTING: + changed = true; + /* FALLTHRU */ + default: + break; + } + break; + case NVME_CTRL_LIVE: + switch (old_state) { + case NVME_CTRL_NEW: + case NVME_CTRL_RESETTING: + case NVME_CTRL_CONNECTING: + changed = true; + /* FALLTHRU */ + default: + break; + } + break; + case NVME_CTRL_RESETTING: + switch (old_state) { + case NVME_CTRL_NEW: + case NVME_CTRL_LIVE: + case NVME_CTRL_ADMIN_ONLY: + changed = true; + /* FALLTHRU */ + default: + break; + } + break; + case NVME_CTRL_CONNECTING: + switch (old_state) { + case NVME_CTRL_NEW: + case NVME_CTRL_RESETTING: + changed = true; + /* FALLTHRU */ + default: + break; + } + break; + case NVME_CTRL_DELETING: + switch (old_state) { + case NVME_CTRL_LIVE: + case NVME_CTRL_ADMIN_ONLY: + case NVME_CTRL_RESETTING: + case NVME_CTRL_CONNECTING: + changed = true; + /* FALLTHRU */ + default: + break; + } + break; + case NVME_CTRL_DEAD: + switch (old_state) { + case NVME_CTRL_DELETING: + changed = true; + /* FALLTHRU */ + default: + break; + } + break; + default: + break; + } + + if (changed) + ctrl->state = new_state; + + spin_unlock_irqrestore(&ctrl->lock, flags); + if (changed && ctrl->state == NVME_CTRL_LIVE) + nvme_kick_requeue_lists(ctrl); + return changed; +} +EXPORT_SYMBOL_GPL(nvme_change_ctrl_state); + +static void nvme_free_ns_head(struct kref *ref) +{ + struct nvme_ns_head *head = + container_of(ref, struct nvme_ns_head, ref); + + nvme_mpath_remove_disk(head); + ida_simple_remove(&head->subsys->ns_ida, head->instance); + list_del_init(&head->entry); + cleanup_srcu_struct_quiesced(&head->srcu); + nvme_put_subsystem(head->subsys); + kfree(head); +} + +static void nvme_put_ns_head(struct nvme_ns_head *head) +{ + kref_put(&head->ref, nvme_free_ns_head); +} + +static void nvme_free_ns(struct kref *kref) +{ + struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); + + if (ns->ndev) + nvme_nvm_unregister(ns); + + put_disk(ns->disk); + nvme_put_ns_head(ns->head); + nvme_put_ctrl(ns->ctrl); + kfree(ns); +} + +static void nvme_put_ns(struct nvme_ns *ns) +{ + kref_put(&ns->kref, nvme_free_ns); +} + +static inline void nvme_clear_nvme_request(struct request *req) +{ + if (!(req->rq_flags & RQF_DONTPREP)) { + nvme_req(req)->retries = 0; + nvme_req(req)->flags = 0; + req->rq_flags |= RQF_DONTPREP; + } +} + +struct request *nvme_alloc_request(struct request_queue *q, + struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid) +{ + unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN; + struct request *req; + + if (qid == NVME_QID_ANY) { + req = blk_mq_alloc_request(q, op, flags); + } else { + req = blk_mq_alloc_request_hctx(q, op, flags, + qid ? qid - 1 : 0); + } + if (IS_ERR(req)) + return req; + + req->cmd_flags |= REQ_FAILFAST_DRIVER; + nvme_clear_nvme_request(req); + nvme_req(req)->cmd = cmd; + + return req; +} +EXPORT_SYMBOL_GPL(nvme_alloc_request); + +static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable) +{ + struct nvme_command c; + + memset(&c, 0, sizeof(c)); + + c.directive.opcode = nvme_admin_directive_send; + c.directive.nsid = cpu_to_le32(NVME_NSID_ALL); + c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE; + c.directive.dtype = NVME_DIR_IDENTIFY; + c.directive.tdtype = NVME_DIR_STREAMS; + c.directive.endir = enable ? NVME_DIR_ENDIR : 0; + + return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0); +} + +static int nvme_disable_streams(struct nvme_ctrl *ctrl) +{ + return nvme_toggle_streams(ctrl, false); +} + +static int nvme_enable_streams(struct nvme_ctrl *ctrl) +{ + return nvme_toggle_streams(ctrl, true); +} + +static int nvme_get_stream_params(struct nvme_ctrl *ctrl, + struct streams_directive_params *s, u32 nsid) +{ + struct nvme_command c; + + memset(&c, 0, sizeof(c)); + memset(s, 0, sizeof(*s)); + + c.directive.opcode = nvme_admin_directive_recv; + c.directive.nsid = cpu_to_le32(nsid); + c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1); + c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM; + c.directive.dtype = NVME_DIR_STREAMS; + + return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s)); +} + +static int nvme_configure_directives(struct nvme_ctrl *ctrl) +{ + struct streams_directive_params s; + int ret; + + if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES)) + return 0; + if (!streams) + return 0; + + ret = nvme_enable_streams(ctrl); + if (ret) + return ret; + + ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL); + if (ret) + return ret; + + ctrl->nssa = le16_to_cpu(s.nssa); + if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) { + dev_info(ctrl->device, "too few streams (%u) available\n", + ctrl->nssa); + nvme_disable_streams(ctrl); + return 0; + } + + ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1); + dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams); + return 0; +} + +/* + * Check if 'req' has a write hint associated with it. If it does, assign + * a valid namespace stream to the write. + */ +static void nvme_assign_write_stream(struct nvme_ctrl *ctrl, + struct request *req, u16 *control, + u32 *dsmgmt) +{ + enum rw_hint streamid = req->write_hint; + + if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE) + streamid = 0; + else { + streamid--; + if (WARN_ON_ONCE(streamid > ctrl->nr_streams)) + return; + + *control |= NVME_RW_DTYPE_STREAMS; + *dsmgmt |= streamid << 16; + } + + if (streamid < ARRAY_SIZE(req->q->write_hints)) + req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9; +} + +static inline void nvme_setup_flush(struct nvme_ns *ns, + struct nvme_command *cmnd) +{ + memset(cmnd, 0, sizeof(*cmnd)); + cmnd->common.opcode = nvme_cmd_flush; + cmnd->common.nsid = cpu_to_le32(ns->head->ns_id); +} + +static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req, + struct nvme_command *cmnd) +{ + unsigned short segments = blk_rq_nr_discard_segments(req), n = 0; + struct nvme_dsm_range *range; + struct bio *bio; + + /* + * Some devices do not consider the DSM 'Number of Ranges' field when + * determining how much data to DMA. Always allocate memory for maximum + * number of segments to prevent device reading beyond end of buffer. + */ + static const size_t alloc_size = sizeof(*range) * NVME_DSM_MAX_RANGES; + + range = kzalloc(alloc_size, GFP_ATOMIC | __GFP_NOWARN); + if (!range) { + /* + * If we fail allocation our range, fallback to the controller + * discard page. If that's also busy, it's safe to return + * busy, as we know we can make progress once that's freed. + */ + if (test_and_set_bit_lock(0, &ns->ctrl->discard_page_busy)) + return BLK_STS_RESOURCE; + + range = page_address(ns->ctrl->discard_page); + } + + __rq_for_each_bio(bio, req) { + u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector); + u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift; + + if (n < segments) { + range[n].cattr = cpu_to_le32(0); + range[n].nlb = cpu_to_le32(nlb); + range[n].slba = cpu_to_le64(slba); + } + n++; + } + + if (WARN_ON_ONCE(n != segments)) { + if (virt_to_page(range) == ns->ctrl->discard_page) + clear_bit_unlock(0, &ns->ctrl->discard_page_busy); + else + kfree(range); + return BLK_STS_IOERR; + } + + memset(cmnd, 0, sizeof(*cmnd)); + cmnd->dsm.opcode = nvme_cmd_dsm; + cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id); + cmnd->dsm.nr = cpu_to_le32(segments - 1); + cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); + + req->special_vec.bv_page = virt_to_page(range); + req->special_vec.bv_offset = offset_in_page(range); + req->special_vec.bv_len = alloc_size; + req->rq_flags |= RQF_SPECIAL_PAYLOAD; + + return BLK_STS_OK; +} + +static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns, + struct request *req, struct nvme_command *cmnd) +{ + struct nvme_ctrl *ctrl = ns->ctrl; + u16 control = 0; + u32 dsmgmt = 0; + + if (req->cmd_flags & REQ_FUA) + control |= NVME_RW_FUA; + if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD)) + control |= NVME_RW_LR; + + if (req->cmd_flags & REQ_RAHEAD) + dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; + + memset(cmnd, 0, sizeof(*cmnd)); + cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read); + cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id); + cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); + cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); + + if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams) + nvme_assign_write_stream(ctrl, req, &control, &dsmgmt); + + if (ns->ms) { + /* + * If formated with metadata, the block layer always provides a + * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled. Else + * we enable the PRACT bit for protection information or set the + * namespace capacity to zero to prevent any I/O. + */ + if (!blk_integrity_rq(req)) { + if (WARN_ON_ONCE(!nvme_ns_has_pi(ns))) + return BLK_STS_NOTSUPP; + control |= NVME_RW_PRINFO_PRACT; + } else if (req_op(req) == REQ_OP_WRITE) { + t10_pi_prepare(req, ns->pi_type); + } + + switch (ns->pi_type) { + case NVME_NS_DPS_PI_TYPE3: + control |= NVME_RW_PRINFO_PRCHK_GUARD; + break; + case NVME_NS_DPS_PI_TYPE1: + case NVME_NS_DPS_PI_TYPE2: + control |= NVME_RW_PRINFO_PRCHK_GUARD | + NVME_RW_PRINFO_PRCHK_REF; + cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req)); + break; + } + } + + cmnd->rw.control = cpu_to_le16(control); + cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); + return 0; +} + +void nvme_cleanup_cmd(struct request *req) +{ + if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ && + nvme_req(req)->status == 0) { + struct nvme_ns *ns = req->rq_disk->private_data; + + t10_pi_complete(req, ns->pi_type, + blk_rq_bytes(req) >> ns->lba_shift); + } + if (req->rq_flags & RQF_SPECIAL_PAYLOAD) { + struct nvme_ns *ns = req->rq_disk->private_data; + struct page *page = req->special_vec.bv_page; + + if (page == ns->ctrl->discard_page) + clear_bit_unlock(0, &ns->ctrl->discard_page_busy); + else + kfree(page_address(page) + req->special_vec.bv_offset); + } +} +EXPORT_SYMBOL_GPL(nvme_cleanup_cmd); + +blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req, + struct nvme_command *cmd) +{ + blk_status_t ret = BLK_STS_OK; + + nvme_clear_nvme_request(req); + + switch (req_op(req)) { + case REQ_OP_DRV_IN: + case REQ_OP_DRV_OUT: + memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd)); + break; + case REQ_OP_FLUSH: + nvme_setup_flush(ns, cmd); + break; + case REQ_OP_WRITE_ZEROES: + /* currently only aliased to deallocate for a few ctrls: */ + case REQ_OP_DISCARD: + ret = nvme_setup_discard(ns, req, cmd); + break; + case REQ_OP_READ: + case REQ_OP_WRITE: + ret = nvme_setup_rw(ns, req, cmd); + break; + default: + WARN_ON_ONCE(1); + return BLK_STS_IOERR; + } + + cmd->common.command_id = req->tag; + trace_nvme_setup_cmd(req, cmd); + return ret; +} +EXPORT_SYMBOL_GPL(nvme_setup_cmd); + +/* + * Returns 0 on success. If the result is negative, it's a Linux error code; + * if the result is positive, it's an NVM Express status code + */ +int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, + union nvme_result *result, void *buffer, unsigned bufflen, + unsigned timeout, int qid, int at_head, + blk_mq_req_flags_t flags) +{ + struct request *req; + int ret; + + req = nvme_alloc_request(q, cmd, flags, qid); + if (IS_ERR(req)) + return PTR_ERR(req); + + req->timeout = timeout ? timeout : ADMIN_TIMEOUT; + + if (buffer && bufflen) { + ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); + if (ret) + goto out; + } + + blk_execute_rq(req->q, NULL, req, at_head); + if (result) + *result = nvme_req(req)->result; + if (nvme_req(req)->flags & NVME_REQ_CANCELLED) + ret = -EINTR; + else + ret = nvme_req(req)->status; + out: + blk_mq_free_request(req); + return ret; +} +EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd); + +int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, + void *buffer, unsigned bufflen) +{ + return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0, + NVME_QID_ANY, 0, 0); +} +EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd); + +static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf, + unsigned len, u32 seed, bool write) +{ + struct bio_integrity_payload *bip; + int ret = -ENOMEM; + void *buf; + + buf = kmalloc(len, GFP_KERNEL); + if (!buf) + goto out; + + ret = -EFAULT; + if (write && copy_from_user(buf, ubuf, len)) + goto out_free_meta; + + bip = bio_integrity_alloc(bio, GFP_KERNEL, 1); + if (IS_ERR(bip)) { + ret = PTR_ERR(bip); + goto out_free_meta; + } + + bip->bip_iter.bi_size = len; + bip->bip_iter.bi_sector = seed; + ret = bio_integrity_add_page(bio, virt_to_page(buf), len, + offset_in_page(buf)); + if (ret == len) + return buf; + ret = -ENOMEM; +out_free_meta: + kfree(buf); +out: + return ERR_PTR(ret); +} + +static int nvme_submit_user_cmd(struct request_queue *q, + struct nvme_command *cmd, void __user *ubuffer, + unsigned bufflen, void __user *meta_buffer, unsigned meta_len, + u32 meta_seed, u32 *result, unsigned timeout) +{ + bool write = nvme_is_write(cmd); + struct nvme_ns *ns = q->queuedata; + struct gendisk *disk = ns ? ns->disk : NULL; + struct request *req; + struct bio *bio = NULL; + void *meta = NULL; + int ret; + + req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY); + if (IS_ERR(req)) + return PTR_ERR(req); + + req->timeout = timeout ? timeout : ADMIN_TIMEOUT; + nvme_req(req)->flags |= NVME_REQ_USERCMD; + + if (ubuffer && bufflen) { + ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, + GFP_KERNEL); + if (ret) + goto out; + bio = req->bio; + bio->bi_disk = disk; + if (disk && meta_buffer && meta_len) { + meta = nvme_add_user_metadata(bio, meta_buffer, meta_len, + meta_seed, write); + if (IS_ERR(meta)) { + ret = PTR_ERR(meta); + goto out_unmap; + } + req->cmd_flags |= REQ_INTEGRITY; + } + } + + blk_execute_rq(req->q, disk, req, 0); + if (nvme_req(req)->flags & NVME_REQ_CANCELLED) + ret = -EINTR; + else + ret = nvme_req(req)->status; + if (result) + *result = le32_to_cpu(nvme_req(req)->result.u32); + if (meta && !ret && !write) { + if (copy_to_user(meta_buffer, meta, meta_len)) + ret = -EFAULT; + } + kfree(meta); + out_unmap: + if (bio) + blk_rq_unmap_user(bio); + out: + blk_mq_free_request(req); + return ret; +} + +static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status) +{ + struct nvme_ctrl *ctrl = rq->end_io_data; + unsigned long flags; + bool startka = false; + + blk_mq_free_request(rq); + + if (status) { + dev_err(ctrl->device, + "failed nvme_keep_alive_end_io error=%d\n", + status); + return; + } + + spin_lock_irqsave(&ctrl->lock, flags); + if (ctrl->state == NVME_CTRL_LIVE || + ctrl->state == NVME_CTRL_CONNECTING) + startka = true; + spin_unlock_irqrestore(&ctrl->lock, flags); + if (startka) + schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); +} + +static int nvme_keep_alive(struct nvme_ctrl *ctrl) +{ + struct request *rq; + + rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED, + NVME_QID_ANY); + if (IS_ERR(rq)) + return PTR_ERR(rq); + + rq->timeout = ctrl->kato * HZ; + rq->end_io_data = ctrl; + + blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io); + + return 0; +} + +static void nvme_keep_alive_work(struct work_struct *work) +{ + struct nvme_ctrl *ctrl = container_of(to_delayed_work(work), + struct nvme_ctrl, ka_work); + + if (nvme_keep_alive(ctrl)) { + /* allocation failure, reset the controller */ + dev_err(ctrl->device, "keep-alive failed\n"); + nvme_reset_ctrl(ctrl); + return; + } +} + +static void nvme_start_keep_alive(struct nvme_ctrl *ctrl) +{ + if (unlikely(ctrl->kato == 0)) + return; + + schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); +} + +void nvme_stop_keep_alive(struct nvme_ctrl *ctrl) +{ + if (unlikely(ctrl->kato == 0)) + return; + + cancel_delayed_work_sync(&ctrl->ka_work); +} +EXPORT_SYMBOL_GPL(nvme_stop_keep_alive); + +/* + * In NVMe 1.0 the CNS field was just a binary controller or namespace + * flag, thus sending any new CNS opcodes has a big chance of not working. + * Qemu unfortunately had that bug after reporting a 1.1 version compliance + * (but not for any later version). + */ +static bool nvme_ctrl_limited_cns(struct nvme_ctrl *ctrl) +{ + if (ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS) + return ctrl->vs < NVME_VS(1, 2, 0); + return ctrl->vs < NVME_VS(1, 1, 0); +} + +static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) +{ + struct nvme_command c = { }; + int error; + + /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ + c.identify.opcode = nvme_admin_identify; + c.identify.cns = NVME_ID_CNS_CTRL; + + *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); + if (!*id) + return -ENOMEM; + + error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, + sizeof(struct nvme_id_ctrl)); + if (error) + kfree(*id); + return error; +} + +static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid, + struct nvme_ns_ids *ids) +{ + struct nvme_command c = { }; + int status; + void *data; + int pos; + int len; + + c.identify.opcode = nvme_admin_identify; + c.identify.nsid = cpu_to_le32(nsid); + c.identify.cns = NVME_ID_CNS_NS_DESC_LIST; + + data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL); + if (!data) + return -ENOMEM; + + status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data, + NVME_IDENTIFY_DATA_SIZE); + if (status) + goto free_data; + + for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) { + struct nvme_ns_id_desc *cur = data + pos; + + if (cur->nidl == 0) + break; + + switch (cur->nidt) { + case NVME_NIDT_EUI64: + if (cur->nidl != NVME_NIDT_EUI64_LEN) { + dev_warn(ctrl->device, + "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n", + cur->nidl); + goto free_data; + } + len = NVME_NIDT_EUI64_LEN; + memcpy(ids->eui64, data + pos + sizeof(*cur), len); + break; + case NVME_NIDT_NGUID: + if (cur->nidl != NVME_NIDT_NGUID_LEN) { + dev_warn(ctrl->device, + "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n", + cur->nidl); + goto free_data; + } + len = NVME_NIDT_NGUID_LEN; + memcpy(ids->nguid, data + pos + sizeof(*cur), len); + break; + case NVME_NIDT_UUID: + if (cur->nidl != NVME_NIDT_UUID_LEN) { + dev_warn(ctrl->device, + "ctrl returned bogus length: %d for NVME_NIDT_UUID\n", + cur->nidl); + goto free_data; + } + len = NVME_NIDT_UUID_LEN; + uuid_copy(&ids->uuid, data + pos + sizeof(*cur)); + break; + default: + /* Skip unnkown types */ + len = cur->nidl; + break; + } + + len += sizeof(*cur); + } +free_data: + kfree(data); + return status; +} + +static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list) +{ + struct nvme_command c = { }; + + c.identify.opcode = nvme_admin_identify; + c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST; + c.identify.nsid = cpu_to_le32(nsid); + return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, + NVME_IDENTIFY_DATA_SIZE); +} + +static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl, + unsigned nsid) +{ + struct nvme_id_ns *id; + struct nvme_command c = { }; + int error; + + /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ + c.identify.opcode = nvme_admin_identify; + c.identify.nsid = cpu_to_le32(nsid); + c.identify.cns = NVME_ID_CNS_NS; + + id = kmalloc(sizeof(*id), GFP_KERNEL); + if (!id) + return NULL; + + error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id)); + if (error) { + dev_warn(ctrl->device, "Identify namespace failed\n"); + kfree(id); + return NULL; + } + + return id; +} + +static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, + void *buffer, size_t buflen, u32 *result) +{ + union nvme_result res = { 0 }; + struct nvme_command c; + int ret; + + memset(&c, 0, sizeof(c)); + c.features.opcode = nvme_admin_set_features; + c.features.fid = cpu_to_le32(fid); + c.features.dword11 = cpu_to_le32(dword11); + + ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res, + buffer, buflen, 0, NVME_QID_ANY, 0, 0); + if (ret >= 0 && result) + *result = le32_to_cpu(res.u32); + return ret; +} + +int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count) +{ + u32 q_count = (*count - 1) | ((*count - 1) << 16); + u32 result; + int status, nr_io_queues; + + status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0, + &result); + if (status < 0) + return status; + + /* + * Degraded controllers might return an error when setting the queue + * count. We still want to be able to bring them online and offer + * access to the admin queue, as that might be only way to fix them up. + */ + if (status > 0) { + dev_err(ctrl->device, "Could not set queue count (%d)\n", status); + *count = 0; + } else { + nr_io_queues = min(result & 0xffff, result >> 16) + 1; + *count = min(*count, nr_io_queues); + } + + return 0; +} +EXPORT_SYMBOL_GPL(nvme_set_queue_count); + +#define NVME_AEN_SUPPORTED \ + (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | NVME_AEN_CFG_ANA_CHANGE) + +static void nvme_enable_aen(struct nvme_ctrl *ctrl) +{ + u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED; + int status; + + if (!supported_aens) + return; + + status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens, + NULL, 0, &result); + if (status) + dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n", + supported_aens); +} + +static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) +{ + struct nvme_user_io io; + struct nvme_command c; + unsigned length, meta_len; + void __user *metadata; + + if (copy_from_user(&io, uio, sizeof(io))) + return -EFAULT; + if (io.flags) + return -EINVAL; + + switch (io.opcode) { + case nvme_cmd_write: + case nvme_cmd_read: + case nvme_cmd_compare: + break; + default: + return -EINVAL; + } + + length = (io.nblocks + 1) << ns->lba_shift; + meta_len = (io.nblocks + 1) * ns->ms; + metadata = (void __user *)(uintptr_t)io.metadata; + + if (ns->ext) { + length += meta_len; + meta_len = 0; + } else if (meta_len) { + if ((io.metadata & 3) || !io.metadata) + return -EINVAL; + } + + memset(&c, 0, sizeof(c)); + c.rw.opcode = io.opcode; + c.rw.flags = io.flags; + c.rw.nsid = cpu_to_le32(ns->head->ns_id); + c.rw.slba = cpu_to_le64(io.slba); + c.rw.length = cpu_to_le16(io.nblocks); + c.rw.control = cpu_to_le16(io.control); + c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); + c.rw.reftag = cpu_to_le32(io.reftag); + c.rw.apptag = cpu_to_le16(io.apptag); + c.rw.appmask = cpu_to_le16(io.appmask); + + return nvme_submit_user_cmd(ns->queue, &c, + (void __user *)(uintptr_t)io.addr, length, + metadata, meta_len, io.slba, NULL, 0); +} + +static u32 nvme_known_admin_effects(u8 opcode) +{ + switch (opcode) { + case nvme_admin_format_nvm: + return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC | + NVME_CMD_EFFECTS_CSE_MASK; + case nvme_admin_sanitize_nvm: + return NVME_CMD_EFFECTS_CSE_MASK; + default: + break; + } + return 0; +} + +static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns, + u8 opcode) +{ + u32 effects = 0; + + if (ns) { + if (ctrl->effects) + effects = le32_to_cpu(ctrl->effects->iocs[opcode]); + if (effects & ~NVME_CMD_EFFECTS_CSUPP) + dev_warn(ctrl->device, + "IO command:%02x has unhandled effects:%08x\n", + opcode, effects); + return 0; + } + + if (ctrl->effects) + effects = le32_to_cpu(ctrl->effects->acs[opcode]); + else + effects = nvme_known_admin_effects(opcode); + + /* + * For simplicity, IO to all namespaces is quiesced even if the command + * effects say only one namespace is affected. + */ + if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) { + mutex_lock(&ctrl->scan_lock); + mutex_lock(&ctrl->subsys->lock); + nvme_mpath_start_freeze(ctrl->subsys); + nvme_mpath_wait_freeze(ctrl->subsys); + nvme_start_freeze(ctrl); + nvme_wait_freeze(ctrl); + } + return effects; +} + +static void nvme_update_formats(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) + if (ns->disk && nvme_revalidate_disk(ns->disk)) + nvme_set_queue_dying(ns); + up_read(&ctrl->namespaces_rwsem); + + nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL); +} + +static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects) +{ + /* + * Revalidate LBA changes prior to unfreezing. This is necessary to + * prevent memory corruption if a logical block size was changed by + * this command. + */ + if (effects & NVME_CMD_EFFECTS_LBCC) + nvme_update_formats(ctrl); + if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) { + nvme_unfreeze(ctrl); + nvme_mpath_unfreeze(ctrl->subsys); + mutex_unlock(&ctrl->subsys->lock); + mutex_unlock(&ctrl->scan_lock); + } + if (effects & NVME_CMD_EFFECTS_CCC) + nvme_init_identify(ctrl); + if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC)) + nvme_queue_scan(ctrl); +} + +static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, + struct nvme_passthru_cmd __user *ucmd) +{ + struct nvme_passthru_cmd cmd; + struct nvme_command c; + unsigned timeout = 0; + u32 effects; + int status; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (copy_from_user(&cmd, ucmd, sizeof(cmd))) + return -EFAULT; + if (cmd.flags) + return -EINVAL; + + memset(&c, 0, sizeof(c)); + c.common.opcode = cmd.opcode; + c.common.flags = cmd.flags; + c.common.nsid = cpu_to_le32(cmd.nsid); + c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); + c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); + c.common.cdw10[0] = cpu_to_le32(cmd.cdw10); + c.common.cdw10[1] = cpu_to_le32(cmd.cdw11); + c.common.cdw10[2] = cpu_to_le32(cmd.cdw12); + c.common.cdw10[3] = cpu_to_le32(cmd.cdw13); + c.common.cdw10[4] = cpu_to_le32(cmd.cdw14); + c.common.cdw10[5] = cpu_to_le32(cmd.cdw15); + + if (cmd.timeout_ms) + timeout = msecs_to_jiffies(cmd.timeout_ms); + + effects = nvme_passthru_start(ctrl, ns, cmd.opcode); + status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, + (void __user *)(uintptr_t)cmd.addr, cmd.data_len, + (void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len, + 0, &cmd.result, timeout); + nvme_passthru_end(ctrl, effects); + + if (status >= 0) { + if (put_user(cmd.result, &ucmd->result)) + return -EFAULT; + } + + return status; +} + +/* + * Issue ioctl requests on the first available path. Note that unlike normal + * block layer requests we will not retry failed request on another controller. + */ +static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk, + struct nvme_ns_head **head, int *srcu_idx) +{ +#ifdef CONFIG_NVME_MULTIPATH + if (disk->fops == &nvme_ns_head_ops) { + struct nvme_ns *ns; + + *head = disk->private_data; + *srcu_idx = srcu_read_lock(&(*head)->srcu); + ns = nvme_find_path(*head); + if (!ns) + srcu_read_unlock(&(*head)->srcu, *srcu_idx); + return ns; + } +#endif + *head = NULL; + *srcu_idx = -1; + return disk->private_data; +} + +static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx) +{ + if (head) + srcu_read_unlock(&head->srcu, idx); +} + +static int nvme_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + struct nvme_ns_head *head = NULL; + void __user *argp = (void __user *)arg; + struct nvme_ns *ns; + int srcu_idx, ret; + + ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); + if (unlikely(!ns)) + return -EWOULDBLOCK; + + /* + * Handle ioctls that apply to the controller instead of the namespace + * seperately and drop the ns SRCU reference early. This avoids a + * deadlock when deleting namespaces using the passthrough interface. + */ + if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) { + struct nvme_ctrl *ctrl = ns->ctrl; + + nvme_get_ctrl(ns->ctrl); + nvme_put_ns_from_disk(head, srcu_idx); + + if (cmd == NVME_IOCTL_ADMIN_CMD) + ret = nvme_user_cmd(ctrl, NULL, argp); + else + ret = sed_ioctl(ctrl->opal_dev, cmd, argp); + + nvme_put_ctrl(ctrl); + return ret; + } + + switch (cmd) { + case NVME_IOCTL_ID: + force_successful_syscall_return(); + ret = ns->head->ns_id; + break; + case NVME_IOCTL_IO_CMD: + ret = nvme_user_cmd(ns->ctrl, ns, argp); + break; + case NVME_IOCTL_SUBMIT_IO: + ret = nvme_submit_io(ns, argp); + break; + default: + if (ns->ndev) + ret = nvme_nvm_ioctl(ns, cmd, arg); + else + ret = -ENOTTY; + } + + nvme_put_ns_from_disk(head, srcu_idx); + return ret; +} + +static int nvme_open(struct block_device *bdev, fmode_t mode) +{ + struct nvme_ns *ns = bdev->bd_disk->private_data; + +#ifdef CONFIG_NVME_MULTIPATH + /* should never be called due to GENHD_FL_HIDDEN */ + if (WARN_ON_ONCE(ns->head->disk)) + goto fail; +#endif + if (!kref_get_unless_zero(&ns->kref)) + goto fail; + if (!try_module_get(ns->ctrl->ops->module)) + goto fail_put_ns; + + return 0; + +fail_put_ns: + nvme_put_ns(ns); +fail: + return -ENXIO; +} + +static void nvme_release(struct gendisk *disk, fmode_t mode) +{ + struct nvme_ns *ns = disk->private_data; + + module_put(ns->ctrl->ops->module); + nvme_put_ns(ns); +} + +static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + /* some standard values */ + geo->heads = 1 << 6; + geo->sectors = 1 << 5; + geo->cylinders = get_capacity(bdev->bd_disk) >> 11; + return 0; +} + +#ifdef CONFIG_BLK_DEV_INTEGRITY +static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type) +{ + struct blk_integrity integrity; + + memset(&integrity, 0, sizeof(integrity)); + switch (pi_type) { + case NVME_NS_DPS_PI_TYPE3: + integrity.profile = &t10_pi_type3_crc; + integrity.tag_size = sizeof(u16) + sizeof(u32); + integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; + break; + case NVME_NS_DPS_PI_TYPE1: + case NVME_NS_DPS_PI_TYPE2: + integrity.profile = &t10_pi_type1_crc; + integrity.tag_size = sizeof(u16); + integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; + break; + default: + integrity.profile = NULL; + break; + } + integrity.tuple_size = ms; + blk_integrity_register(disk, &integrity); + blk_queue_max_integrity_segments(disk->queue, 1); +} +#else +static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type) +{ +} +#endif /* CONFIG_BLK_DEV_INTEGRITY */ + +static void nvme_set_chunk_size(struct nvme_ns *ns) +{ + u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9)); + blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size)); +} + +static void nvme_config_discard(struct nvme_ns *ns) +{ + struct nvme_ctrl *ctrl = ns->ctrl; + struct request_queue *queue = ns->queue; + u32 size = queue_logical_block_size(queue); + + if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) { + blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue); + return; + } + + if (ctrl->nr_streams && ns->sws && ns->sgs) + size *= ns->sws * ns->sgs; + + BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) < + NVME_DSM_MAX_RANGES); + + queue->limits.discard_alignment = 0; + queue->limits.discard_granularity = size; + + /* If discard is already enabled, don't reset queue limits */ + if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue)) + return; + + blk_queue_max_discard_sectors(queue, UINT_MAX); + blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES); + + if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES) + blk_queue_max_write_zeroes_sectors(queue, UINT_MAX); +} + +static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid, + struct nvme_id_ns *id, struct nvme_ns_ids *ids) +{ + memset(ids, 0, sizeof(*ids)); + + if (ctrl->vs >= NVME_VS(1, 1, 0)) + memcpy(ids->eui64, id->eui64, sizeof(id->eui64)); + if (ctrl->vs >= NVME_VS(1, 2, 0)) + memcpy(ids->nguid, id->nguid, sizeof(id->nguid)); + if (ctrl->vs >= NVME_VS(1, 3, 0)) { + /* Don't treat error as fatal we potentially + * already have a NGUID or EUI-64 + */ + if (nvme_identify_ns_descs(ctrl, nsid, ids)) + dev_warn(ctrl->device, + "%s: Identify Descriptors failed\n", __func__); + } +} + +static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids) +{ + return !uuid_is_null(&ids->uuid) || + memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) || + memchr_inv(ids->eui64, 0, sizeof(ids->eui64)); +} + +static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b) +{ + return uuid_equal(&a->uuid, &b->uuid) && + memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 && + memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0; +} + +static void nvme_update_disk_info(struct gendisk *disk, + struct nvme_ns *ns, struct nvme_id_ns *id) +{ + sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9); + unsigned short bs = 1 << ns->lba_shift; + + if (ns->lba_shift > PAGE_SHIFT) { + /* unsupported block size, set capacity to 0 later */ + bs = (1 << 9); + } + blk_mq_freeze_queue(disk->queue); + blk_integrity_unregister(disk); + + blk_queue_logical_block_size(disk->queue, bs); + blk_queue_physical_block_size(disk->queue, bs); + blk_queue_io_min(disk->queue, bs); + + if (ns->ms && !ns->ext && + (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)) + nvme_init_integrity(disk, ns->ms, ns->pi_type); + if ((ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) || + ns->lba_shift > PAGE_SHIFT) + capacity = 0; + + set_capacity(disk, capacity); + nvme_config_discard(ns); + + if (id->nsattr & (1 << 0)) + set_disk_ro(disk, true); + else + set_disk_ro(disk, false); + + blk_mq_unfreeze_queue(disk->queue); +} + +static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id) +{ + struct nvme_ns *ns = disk->private_data; + + /* + * If identify namespace failed, use default 512 byte block size so + * block layer can use before failing read/write for 0 capacity. + */ + ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds; + if (ns->lba_shift == 0) + ns->lba_shift = 9; + ns->noiob = le16_to_cpu(id->noiob); + ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms); + ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); + /* the PI implementation requires metadata equal t10 pi tuple size */ + if (ns->ms == sizeof(struct t10_pi_tuple)) + ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK; + else + ns->pi_type = 0; + + if (ns->noiob) + nvme_set_chunk_size(ns); + nvme_update_disk_info(disk, ns, id); + if (ns->ndev) + nvme_nvm_update_nvm_info(ns); +#ifdef CONFIG_NVME_MULTIPATH + if (ns->head->disk) { + nvme_update_disk_info(ns->head->disk, ns, id); + blk_queue_stack_limits(ns->head->disk->queue, ns->queue); + nvme_mpath_update_disk_size(ns->head->disk); + } +#endif +} + +static int nvme_revalidate_disk(struct gendisk *disk) +{ + struct nvme_ns *ns = disk->private_data; + struct nvme_ctrl *ctrl = ns->ctrl; + struct nvme_id_ns *id; + struct nvme_ns_ids ids; + int ret = 0; + + if (test_bit(NVME_NS_DEAD, &ns->flags)) { + set_capacity(disk, 0); + return -ENODEV; + } + + id = nvme_identify_ns(ctrl, ns->head->ns_id); + if (!id) + return -ENODEV; + + if (id->ncap == 0) { + ret = -ENODEV; + goto out; + } + + __nvme_revalidate_disk(disk, id); + nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids); + if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) { + dev_err(ctrl->device, + "identifiers changed for nsid %d\n", ns->head->ns_id); + ret = -ENODEV; + } + +out: + kfree(id); + return ret; +} + +static char nvme_pr_type(enum pr_type type) +{ + switch (type) { + case PR_WRITE_EXCLUSIVE: + return 1; + case PR_EXCLUSIVE_ACCESS: + return 2; + case PR_WRITE_EXCLUSIVE_REG_ONLY: + return 3; + case PR_EXCLUSIVE_ACCESS_REG_ONLY: + return 4; + case PR_WRITE_EXCLUSIVE_ALL_REGS: + return 5; + case PR_EXCLUSIVE_ACCESS_ALL_REGS: + return 6; + default: + return 0; + } +}; + +static int nvme_pr_command(struct block_device *bdev, u32 cdw10, + u64 key, u64 sa_key, u8 op) +{ + struct nvme_ns_head *head = NULL; + struct nvme_ns *ns; + struct nvme_command c; + int srcu_idx, ret; + u8 data[16] = { 0, }; + + ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); + if (unlikely(!ns)) + return -EWOULDBLOCK; + + put_unaligned_le64(key, &data[0]); + put_unaligned_le64(sa_key, &data[8]); + + memset(&c, 0, sizeof(c)); + c.common.opcode = op; + c.common.nsid = cpu_to_le32(ns->head->ns_id); + c.common.cdw10[0] = cpu_to_le32(cdw10); + + ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16); + nvme_put_ns_from_disk(head, srcu_idx); + return ret; +} + +static int nvme_pr_register(struct block_device *bdev, u64 old, + u64 new, unsigned flags) +{ + u32 cdw10; + + if (flags & ~PR_FL_IGNORE_KEY) + return -EOPNOTSUPP; + + cdw10 = old ? 2 : 0; + cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0; + cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */ + return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register); +} + +static int nvme_pr_reserve(struct block_device *bdev, u64 key, + enum pr_type type, unsigned flags) +{ + u32 cdw10; + + if (flags & ~PR_FL_IGNORE_KEY) + return -EOPNOTSUPP; + + cdw10 = nvme_pr_type(type) << 8; + cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0); + return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire); +} + +static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new, + enum pr_type type, bool abort) +{ + u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1); + return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire); +} + +static int nvme_pr_clear(struct block_device *bdev, u64 key) +{ + u32 cdw10 = 1 | (key ? 1 << 3 : 0); + return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register); +} + +static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type) +{ + u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0); + return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release); +} + +static const struct pr_ops nvme_pr_ops = { + .pr_register = nvme_pr_register, + .pr_reserve = nvme_pr_reserve, + .pr_release = nvme_pr_release, + .pr_preempt = nvme_pr_preempt, + .pr_clear = nvme_pr_clear, +}; + +#ifdef CONFIG_BLK_SED_OPAL +int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len, + bool send) +{ + struct nvme_ctrl *ctrl = data; + struct nvme_command cmd; + + memset(&cmd, 0, sizeof(cmd)); + if (send) + cmd.common.opcode = nvme_admin_security_send; + else + cmd.common.opcode = nvme_admin_security_recv; + cmd.common.nsid = 0; + cmd.common.cdw10[0] = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8); + cmd.common.cdw10[1] = cpu_to_le32(len); + + return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len, + ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0); +} +EXPORT_SYMBOL_GPL(nvme_sec_submit); +#endif /* CONFIG_BLK_SED_OPAL */ + +static const struct block_device_operations nvme_fops = { + .owner = THIS_MODULE, + .ioctl = nvme_ioctl, + .compat_ioctl = nvme_ioctl, + .open = nvme_open, + .release = nvme_release, + .getgeo = nvme_getgeo, + .revalidate_disk= nvme_revalidate_disk, + .pr_ops = &nvme_pr_ops, +}; + +#ifdef CONFIG_NVME_MULTIPATH +static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode) +{ + struct nvme_ns_head *head = bdev->bd_disk->private_data; + + if (!kref_get_unless_zero(&head->ref)) + return -ENXIO; + return 0; +} + +static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode) +{ + nvme_put_ns_head(disk->private_data); +} + +const struct block_device_operations nvme_ns_head_ops = { + .owner = THIS_MODULE, + .open = nvme_ns_head_open, + .release = nvme_ns_head_release, + .ioctl = nvme_ioctl, + .compat_ioctl = nvme_ioctl, + .getgeo = nvme_getgeo, + .pr_ops = &nvme_pr_ops, +}; +#endif /* CONFIG_NVME_MULTIPATH */ + +static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled) +{ + unsigned long timeout = + ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; + u32 csts, bit = enabled ? NVME_CSTS_RDY : 0; + int ret; + + while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { + if (csts == ~0) + return -ENODEV; + if ((csts & NVME_CSTS_RDY) == bit) + break; + + msleep(100); + if (fatal_signal_pending(current)) + return -EINTR; + if (time_after(jiffies, timeout)) { + dev_err(ctrl->device, + "Device not ready; aborting %s\n", enabled ? + "initialisation" : "reset"); + return -ENODEV; + } + } + + return ret; +} + +/* + * If the device has been passed off to us in an enabled state, just clear + * the enabled bit. The spec says we should set the 'shutdown notification + * bits', but doing so may cause the device to complete commands to the + * admin queue ... and we don't know what memory that might be pointing at! + */ +int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap) +{ + int ret; + + ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; + ctrl->ctrl_config &= ~NVME_CC_ENABLE; + + ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); + if (ret) + return ret; + + if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY) + msleep(NVME_QUIRK_DELAY_AMOUNT); + + return nvme_wait_ready(ctrl, cap, false); +} +EXPORT_SYMBOL_GPL(nvme_disable_ctrl); + +int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap) +{ + /* + * Default to a 4K page size, with the intention to update this + * path in the future to accomodate architectures with differing + * kernel and IO page sizes. + */ + unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12; + int ret; + + if (page_shift < dev_page_min) { + dev_err(ctrl->device, + "Minimum device page size %u too large for host (%u)\n", + 1 << dev_page_min, 1 << page_shift); + return -ENODEV; + } + + ctrl->page_size = 1 << page_shift; + + ctrl->ctrl_config = NVME_CC_CSS_NVM; + ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT; + ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE; + ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; + ctrl->ctrl_config |= NVME_CC_ENABLE; + + ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); + if (ret) + return ret; + return nvme_wait_ready(ctrl, cap, true); +} +EXPORT_SYMBOL_GPL(nvme_enable_ctrl); + +int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl) +{ + unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ); + u32 csts; + int ret; + + ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; + ctrl->ctrl_config |= NVME_CC_SHN_NORMAL; + + ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); + if (ret) + return ret; + + while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { + if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT) + break; + + msleep(100); + if (fatal_signal_pending(current)) + return -EINTR; + if (time_after(jiffies, timeout)) { + dev_err(ctrl->device, + "Device shutdown incomplete; abort shutdown\n"); + return -ENODEV; + } + } + + return ret; +} +EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl); + +static void nvme_set_queue_limits(struct nvme_ctrl *ctrl, + struct request_queue *q) +{ + bool vwc = false; + + if (ctrl->max_hw_sectors) { + u32 max_segments = + (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1; + + max_segments = min_not_zero(max_segments, ctrl->max_segments); + blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors); + blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX)); + } + if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && + is_power_of_2(ctrl->max_hw_sectors)) + blk_queue_chunk_sectors(q, ctrl->max_hw_sectors); + blk_queue_virt_boundary(q, ctrl->page_size - 1); + if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) + vwc = true; + blk_queue_write_cache(q, vwc, vwc); +} + +static int nvme_configure_timestamp(struct nvme_ctrl *ctrl) +{ + __le64 ts; + int ret; + + if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP)) + return 0; + + ts = cpu_to_le64(ktime_to_ms(ktime_get_real())); + ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts), + NULL); + if (ret) + dev_warn_once(ctrl->device, + "could not set timestamp (%d)\n", ret); + return ret; +} + +static int nvme_configure_apst(struct nvme_ctrl *ctrl) +{ + /* + * APST (Autonomous Power State Transition) lets us program a + * table of power state transitions that the controller will + * perform automatically. We configure it with a simple + * heuristic: we are willing to spend at most 2% of the time + * transitioning between power states. Therefore, when running + * in any given state, we will enter the next lower-power + * non-operational state after waiting 50 * (enlat + exlat) + * microseconds, as long as that state's exit latency is under + * the requested maximum latency. + * + * We will not autonomously enter any non-operational state for + * which the total latency exceeds ps_max_latency_us. Users + * can set ps_max_latency_us to zero to turn off APST. + */ + + unsigned apste; + struct nvme_feat_auto_pst *table; + u64 max_lat_us = 0; + int max_ps = -1; + int ret; + + /* + * If APST isn't supported or if we haven't been initialized yet, + * then don't do anything. + */ + if (!ctrl->apsta) + return 0; + + if (ctrl->npss > 31) { + dev_warn(ctrl->device, "NPSS is invalid; not using APST\n"); + return 0; + } + + table = kzalloc(sizeof(*table), GFP_KERNEL); + if (!table) + return 0; + + if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) { + /* Turn off APST. */ + apste = 0; + dev_dbg(ctrl->device, "APST disabled\n"); + } else { + __le64 target = cpu_to_le64(0); + int state; + + /* + * Walk through all states from lowest- to highest-power. + * According to the spec, lower-numbered states use more + * power. NPSS, despite the name, is the index of the + * lowest-power state, not the number of states. + */ + for (state = (int)ctrl->npss; state >= 0; state--) { + u64 total_latency_us, exit_latency_us, transition_ms; + + if (target) + table->entries[state] = target; + + /* + * Don't allow transitions to the deepest state + * if it's quirked off. + */ + if (state == ctrl->npss && + (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) + continue; + + /* + * Is this state a useful non-operational state for + * higher-power states to autonomously transition to? + */ + if (!(ctrl->psd[state].flags & + NVME_PS_FLAGS_NON_OP_STATE)) + continue; + + exit_latency_us = + (u64)le32_to_cpu(ctrl->psd[state].exit_lat); + if (exit_latency_us > ctrl->ps_max_latency_us) + continue; + + total_latency_us = + exit_latency_us + + le32_to_cpu(ctrl->psd[state].entry_lat); + + /* + * This state is good. Use it as the APST idle + * target for higher power states. + */ + transition_ms = total_latency_us + 19; + do_div(transition_ms, 20); + if (transition_ms > (1 << 24) - 1) + transition_ms = (1 << 24) - 1; + + target = cpu_to_le64((state << 3) | + (transition_ms << 8)); + + if (max_ps == -1) + max_ps = state; + + if (total_latency_us > max_lat_us) + max_lat_us = total_latency_us; + } + + apste = 1; + + if (max_ps == -1) { + dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n"); + } else { + dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n", + max_ps, max_lat_us, (int)sizeof(*table), table); + } + } + + ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste, + table, sizeof(*table), NULL); + if (ret) + dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret); + + kfree(table); + return ret; +} + +static void nvme_set_latency_tolerance(struct device *dev, s32 val) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + u64 latency; + + switch (val) { + case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT: + case PM_QOS_LATENCY_ANY: + latency = U64_MAX; + break; + + default: + latency = val; + } + + if (ctrl->ps_max_latency_us != latency) { + ctrl->ps_max_latency_us = latency; + if (ctrl->state == NVME_CTRL_LIVE) + nvme_configure_apst(ctrl); + } +} + +struct nvme_core_quirk_entry { + /* + * NVMe model and firmware strings are padded with spaces. For + * simplicity, strings in the quirk table are padded with NULLs + * instead. + */ + u16 vid; + const char *mn; + const char *fr; + unsigned long quirks; +}; + +static const struct nvme_core_quirk_entry core_quirks[] = { + { + /* + * This Toshiba device seems to die using any APST states. See: + * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11 + */ + .vid = 0x1179, + .mn = "THNSF5256GPUK TOSHIBA", + .quirks = NVME_QUIRK_NO_APST, + } +}; + +/* match is null-terminated but idstr is space-padded. */ +static bool string_matches(const char *idstr, const char *match, size_t len) +{ + size_t matchlen; + + if (!match) + return true; + + matchlen = strlen(match); + WARN_ON_ONCE(matchlen > len); + + if (memcmp(idstr, match, matchlen)) + return false; + + for (; matchlen < len; matchlen++) + if (idstr[matchlen] != ' ') + return false; + + return true; +} + +static bool quirk_matches(const struct nvme_id_ctrl *id, + const struct nvme_core_quirk_entry *q) +{ + return q->vid == le16_to_cpu(id->vid) && + string_matches(id->mn, q->mn, sizeof(id->mn)) && + string_matches(id->fr, q->fr, sizeof(id->fr)); +} + +static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl, + struct nvme_id_ctrl *id) +{ + size_t nqnlen; + int off; + + nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE); + if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) { + strncpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE); + return; + } + + if (ctrl->vs >= NVME_VS(1, 2, 1)) + dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n"); + + /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */ + off = snprintf(subsys->subnqn, NVMF_NQN_SIZE, + "nqn.2014.08.org.nvmexpress:%04x%04x", + le16_to_cpu(id->vid), le16_to_cpu(id->ssvid)); + memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn)); + off += sizeof(id->sn); + memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn)); + off += sizeof(id->mn); + memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off); +} + +static void __nvme_release_subsystem(struct nvme_subsystem *subsys) +{ + ida_simple_remove(&nvme_subsystems_ida, subsys->instance); + kfree(subsys); +} + +static void nvme_release_subsystem(struct device *dev) +{ + __nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev)); +} + +static void nvme_destroy_subsystem(struct kref *ref) +{ + struct nvme_subsystem *subsys = + container_of(ref, struct nvme_subsystem, ref); + + mutex_lock(&nvme_subsystems_lock); + list_del(&subsys->entry); + mutex_unlock(&nvme_subsystems_lock); + + ida_destroy(&subsys->ns_ida); + device_del(&subsys->dev); + put_device(&subsys->dev); +} + +static void nvme_put_subsystem(struct nvme_subsystem *subsys) +{ + kref_put(&subsys->ref, nvme_destroy_subsystem); +} + +static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn) +{ + struct nvme_subsystem *subsys; + + lockdep_assert_held(&nvme_subsystems_lock); + + /* + * Fail matches for discovery subsystems. This results + * in each discovery controller bound to a unique subsystem. + * This avoids issues with validating controller values + * that can only be true when there is a single unique subsystem. + * There may be multiple and completely independent entities + * that provide discovery controllers. + */ + if (!strcmp(subsysnqn, NVME_DISC_SUBSYS_NAME)) + return NULL; + + list_for_each_entry(subsys, &nvme_subsystems, entry) { + if (strcmp(subsys->subnqn, subsysnqn)) + continue; + if (!kref_get_unless_zero(&subsys->ref)) + continue; + return subsys; + } + + return NULL; +} + +#define SUBSYS_ATTR_RO(_name, _mode, _show) \ + struct device_attribute subsys_attr_##_name = \ + __ATTR(_name, _mode, _show, NULL) + +static ssize_t nvme_subsys_show_nqn(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct nvme_subsystem *subsys = + container_of(dev, struct nvme_subsystem, dev); + + return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn); +} +static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn); + +#define nvme_subsys_show_str_function(field) \ +static ssize_t subsys_##field##_show(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct nvme_subsystem *subsys = \ + container_of(dev, struct nvme_subsystem, dev); \ + return sprintf(buf, "%.*s\n", \ + (int)sizeof(subsys->field), subsys->field); \ +} \ +static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show); + +nvme_subsys_show_str_function(model); +nvme_subsys_show_str_function(serial); +nvme_subsys_show_str_function(firmware_rev); + +static struct attribute *nvme_subsys_attrs[] = { + &subsys_attr_model.attr, + &subsys_attr_serial.attr, + &subsys_attr_firmware_rev.attr, + &subsys_attr_subsysnqn.attr, + NULL, +}; + +static struct attribute_group nvme_subsys_attrs_group = { + .attrs = nvme_subsys_attrs, +}; + +static const struct attribute_group *nvme_subsys_attrs_groups[] = { + &nvme_subsys_attrs_group, + NULL, +}; + +static int nvme_active_ctrls(struct nvme_subsystem *subsys) +{ + int count = 0; + struct nvme_ctrl *ctrl; + + mutex_lock(&subsys->lock); + list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { + if (ctrl->state != NVME_CTRL_DELETING && + ctrl->state != NVME_CTRL_DEAD) + count++; + } + mutex_unlock(&subsys->lock); + + return count; +} + +static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) +{ + struct nvme_subsystem *subsys, *found; + int ret; + + subsys = kzalloc(sizeof(*subsys), GFP_KERNEL); + if (!subsys) + return -ENOMEM; + ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL); + if (ret < 0) { + kfree(subsys); + return ret; + } + subsys->instance = ret; + mutex_init(&subsys->lock); + kref_init(&subsys->ref); + INIT_LIST_HEAD(&subsys->ctrls); + INIT_LIST_HEAD(&subsys->nsheads); + nvme_init_subnqn(subsys, ctrl, id); + memcpy(subsys->serial, id->sn, sizeof(subsys->serial)); + memcpy(subsys->model, id->mn, sizeof(subsys->model)); + memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev)); + subsys->vendor_id = le16_to_cpu(id->vid); + subsys->cmic = id->cmic; + + subsys->dev.class = nvme_subsys_class; + subsys->dev.release = nvme_release_subsystem; + subsys->dev.groups = nvme_subsys_attrs_groups; + dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance); + device_initialize(&subsys->dev); + + mutex_lock(&nvme_subsystems_lock); + found = __nvme_find_get_subsystem(subsys->subnqn); + if (found) { + /* + * Verify that the subsystem actually supports multiple + * controllers, else bail out. + */ + if (!(ctrl->opts && ctrl->opts->discovery_nqn) && + nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) { + dev_err(ctrl->device, + "ignoring ctrl due to duplicate subnqn (%s).\n", + found->subnqn); + nvme_put_subsystem(found); + ret = -EINVAL; + goto out_unlock; + } + + __nvme_release_subsystem(subsys); + subsys = found; + } else { + ret = device_add(&subsys->dev); + if (ret) { + dev_err(ctrl->device, + "failed to register subsystem device.\n"); + goto out_unlock; + } + ida_init(&subsys->ns_ida); + list_add_tail(&subsys->entry, &nvme_subsystems); + } + + ctrl->subsys = subsys; + mutex_unlock(&nvme_subsystems_lock); + + if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj, + dev_name(ctrl->device))) { + dev_err(ctrl->device, + "failed to create sysfs link from subsystem.\n"); + /* the transport driver will eventually put the subsystem */ + return -EINVAL; + } + + mutex_lock(&subsys->lock); + list_add_tail(&ctrl->subsys_entry, &subsys->ctrls); + mutex_unlock(&subsys->lock); + + return 0; + +out_unlock: + mutex_unlock(&nvme_subsystems_lock); + put_device(&subsys->dev); + return ret; +} + +int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, + void *log, size_t size, u64 offset) +{ + struct nvme_command c = { }; + unsigned long dwlen = size / 4 - 1; + + c.get_log_page.opcode = nvme_admin_get_log_page; + c.get_log_page.nsid = cpu_to_le32(nsid); + c.get_log_page.lid = log_page; + c.get_log_page.lsp = lsp; + c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1)); + c.get_log_page.numdu = cpu_to_le16(dwlen >> 16); + c.get_log_page.lpol = cpu_to_le32(lower_32_bits(offset)); + c.get_log_page.lpou = cpu_to_le32(upper_32_bits(offset)); + + return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size); +} + +static int nvme_get_effects_log(struct nvme_ctrl *ctrl) +{ + int ret; + + if (!ctrl->effects) + ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL); + + if (!ctrl->effects) + return 0; + + ret = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CMD_EFFECTS, 0, + ctrl->effects, sizeof(*ctrl->effects), 0); + if (ret) { + kfree(ctrl->effects); + ctrl->effects = NULL; + } + return ret; +} + +/* + * Initialize the cached copies of the Identify data and various controller + * register in our nvme_ctrl structure. This should be called as soon as + * the admin queue is fully up and running. + */ +int nvme_init_identify(struct nvme_ctrl *ctrl) +{ + struct nvme_id_ctrl *id; + u64 cap; + int ret, page_shift; + u32 max_hw_sectors; + bool prev_apst_enabled; + + ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs); + if (ret) { + dev_err(ctrl->device, "Reading VS failed (%d)\n", ret); + return ret; + } + + ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap); + if (ret) { + dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret); + return ret; + } + page_shift = NVME_CAP_MPSMIN(cap) + 12; + + if (ctrl->vs >= NVME_VS(1, 1, 0)) + ctrl->subsystem = NVME_CAP_NSSRC(cap); + + ret = nvme_identify_ctrl(ctrl, &id); + if (ret) { + dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret); + return -EIO; + } + + if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) { + ret = nvme_get_effects_log(ctrl); + if (ret < 0) + goto out_free; + } + + if (!ctrl->identified) { + int i; + + ret = nvme_init_subsystem(ctrl, id); + if (ret) + goto out_free; + + /* + * Check for quirks. Quirk can depend on firmware version, + * so, in principle, the set of quirks present can change + * across a reset. As a possible future enhancement, we + * could re-scan for quirks every time we reinitialize + * the device, but we'd have to make sure that the driver + * behaves intelligently if the quirks change. + */ + for (i = 0; i < ARRAY_SIZE(core_quirks); i++) { + if (quirk_matches(id, &core_quirks[i])) + ctrl->quirks |= core_quirks[i].quirks; + } + } + + if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) { + dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n"); + ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS; + } + + ctrl->oacs = le16_to_cpu(id->oacs); + ctrl->oncs = le16_to_cpup(&id->oncs); + ctrl->oaes = le32_to_cpu(id->oaes); + atomic_set(&ctrl->abort_limit, id->acl + 1); + ctrl->vwc = id->vwc; + ctrl->cntlid = le16_to_cpup(&id->cntlid); + if (id->mdts) + max_hw_sectors = 1 << (id->mdts + page_shift - 9); + else + max_hw_sectors = UINT_MAX; + ctrl->max_hw_sectors = + min_not_zero(ctrl->max_hw_sectors, max_hw_sectors); + + nvme_set_queue_limits(ctrl, ctrl->admin_q); + ctrl->sgls = le32_to_cpu(id->sgls); + ctrl->kas = le16_to_cpu(id->kas); + ctrl->max_namespaces = le32_to_cpu(id->mnan); + + if (id->rtd3e) { + /* us -> s */ + u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000; + + ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time, + shutdown_timeout, 60); + + if (ctrl->shutdown_timeout != shutdown_timeout) + dev_info(ctrl->device, + "Shutdown timeout set to %u seconds\n", + ctrl->shutdown_timeout); + } else + ctrl->shutdown_timeout = shutdown_timeout; + + ctrl->npss = id->npss; + ctrl->apsta = id->apsta; + prev_apst_enabled = ctrl->apst_enabled; + if (ctrl->quirks & NVME_QUIRK_NO_APST) { + if (force_apst && id->apsta) { + dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n"); + ctrl->apst_enabled = true; + } else { + ctrl->apst_enabled = false; + } + } else { + ctrl->apst_enabled = id->apsta; + } + memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd)); + + if (ctrl->ops->flags & NVME_F_FABRICS) { + ctrl->icdoff = le16_to_cpu(id->icdoff); + ctrl->ioccsz = le32_to_cpu(id->ioccsz); + ctrl->iorcsz = le32_to_cpu(id->iorcsz); + ctrl->maxcmd = le16_to_cpu(id->maxcmd); + + /* + * In fabrics we need to verify the cntlid matches the + * admin connect + */ + if (ctrl->cntlid != le16_to_cpu(id->cntlid)) { + ret = -EINVAL; + goto out_free; + } + + if (!ctrl->opts->discovery_nqn && !ctrl->kas) { + dev_err(ctrl->device, + "keep-alive support is mandatory for fabrics\n"); + ret = -EINVAL; + goto out_free; + } + } else { + ctrl->cntlid = le16_to_cpu(id->cntlid); + ctrl->hmpre = le32_to_cpu(id->hmpre); + ctrl->hmmin = le32_to_cpu(id->hmmin); + ctrl->hmminds = le32_to_cpu(id->hmminds); + ctrl->hmmaxd = le16_to_cpu(id->hmmaxd); + } + + ret = nvme_mpath_init(ctrl, id); + kfree(id); + + if (ret < 0) + return ret; + + if (ctrl->apst_enabled && !prev_apst_enabled) + dev_pm_qos_expose_latency_tolerance(ctrl->device); + else if (!ctrl->apst_enabled && prev_apst_enabled) + dev_pm_qos_hide_latency_tolerance(ctrl->device); + + ret = nvme_configure_apst(ctrl); + if (ret < 0) + return ret; + + ret = nvme_configure_timestamp(ctrl); + if (ret < 0) + return ret; + + ret = nvme_configure_directives(ctrl); + if (ret < 0) + return ret; + + ctrl->identified = true; + + return 0; + +out_free: + kfree(id); + return ret; +} +EXPORT_SYMBOL_GPL(nvme_init_identify); + +static int nvme_dev_open(struct inode *inode, struct file *file) +{ + struct nvme_ctrl *ctrl = + container_of(inode->i_cdev, struct nvme_ctrl, cdev); + + switch (ctrl->state) { + case NVME_CTRL_LIVE: + case NVME_CTRL_ADMIN_ONLY: + break; + default: + return -EWOULDBLOCK; + } + + nvme_get_ctrl(ctrl); + if (!try_module_get(ctrl->ops->module)) { + nvme_put_ctrl(ctrl); + return -EINVAL; + } + + file->private_data = ctrl; + return 0; +} + +static int nvme_dev_release(struct inode *inode, struct file *file) +{ + struct nvme_ctrl *ctrl = + container_of(inode->i_cdev, struct nvme_ctrl, cdev); + + module_put(ctrl->ops->module); + nvme_put_ctrl(ctrl); + return 0; +} + +static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp) +{ + struct nvme_ns *ns; + int ret; + + down_read(&ctrl->namespaces_rwsem); + if (list_empty(&ctrl->namespaces)) { + ret = -ENOTTY; + goto out_unlock; + } + + ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list); + if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) { + dev_warn(ctrl->device, + "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n"); + ret = -EINVAL; + goto out_unlock; + } + + dev_warn(ctrl->device, + "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n"); + kref_get(&ns->kref); + up_read(&ctrl->namespaces_rwsem); + + ret = nvme_user_cmd(ctrl, ns, argp); + nvme_put_ns(ns); + return ret; + +out_unlock: + up_read(&ctrl->namespaces_rwsem); + return ret; +} + +static long nvme_dev_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct nvme_ctrl *ctrl = file->private_data; + void __user *argp = (void __user *)arg; + + switch (cmd) { + case NVME_IOCTL_ADMIN_CMD: + return nvme_user_cmd(ctrl, NULL, argp); + case NVME_IOCTL_IO_CMD: + return nvme_dev_user_cmd(ctrl, argp); + case NVME_IOCTL_RESET: + dev_warn(ctrl->device, "resetting controller\n"); + return nvme_reset_ctrl_sync(ctrl); + case NVME_IOCTL_SUBSYS_RESET: + return nvme_reset_subsystem(ctrl); + case NVME_IOCTL_RESCAN: + nvme_queue_scan(ctrl); + return 0; + default: + return -ENOTTY; + } +} + +static const struct file_operations nvme_dev_fops = { + .owner = THIS_MODULE, + .open = nvme_dev_open, + .release = nvme_dev_release, + .unlocked_ioctl = nvme_dev_ioctl, + .compat_ioctl = nvme_dev_ioctl, +}; + +static ssize_t nvme_sysfs_reset(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + int ret; + + ret = nvme_reset_ctrl_sync(ctrl); + if (ret < 0) + return ret; + return count; +} +static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); + +static ssize_t nvme_sysfs_rescan(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + + nvme_queue_scan(ctrl); + return count; +} +static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan); + +static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev) +{ + struct gendisk *disk = dev_to_disk(dev); + + if (disk->fops == &nvme_fops) + return nvme_get_ns_from_dev(dev)->head; + else + return disk->private_data; +} + +static ssize_t wwid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct nvme_ns_head *head = dev_to_ns_head(dev); + struct nvme_ns_ids *ids = &head->ids; + struct nvme_subsystem *subsys = head->subsys; + int serial_len = sizeof(subsys->serial); + int model_len = sizeof(subsys->model); + + if (!uuid_is_null(&ids->uuid)) + return sprintf(buf, "uuid.%pU\n", &ids->uuid); + + if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) + return sprintf(buf, "eui.%16phN\n", ids->nguid); + + if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) + return sprintf(buf, "eui.%8phN\n", ids->eui64); + + while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' || + subsys->serial[serial_len - 1] == '\0')) + serial_len--; + while (model_len > 0 && (subsys->model[model_len - 1] == ' ' || + subsys->model[model_len - 1] == '\0')) + model_len--; + + return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id, + serial_len, subsys->serial, model_len, subsys->model, + head->ns_id); +} +static DEVICE_ATTR_RO(wwid); + +static ssize_t nguid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid); +} +static DEVICE_ATTR_RO(nguid); + +static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids; + + /* For backward compatibility expose the NGUID to userspace if + * we have no UUID set + */ + if (uuid_is_null(&ids->uuid)) { + printk_ratelimited(KERN_WARNING + "No UUID available providing old NGUID\n"); + return sprintf(buf, "%pU\n", ids->nguid); + } + return sprintf(buf, "%pU\n", &ids->uuid); +} +static DEVICE_ATTR_RO(uuid); + +static ssize_t eui_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64); +} +static DEVICE_ATTR_RO(eui); + +static ssize_t nsid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id); +} +static DEVICE_ATTR_RO(nsid); + +static struct attribute *nvme_ns_id_attrs[] = { + &dev_attr_wwid.attr, + &dev_attr_uuid.attr, + &dev_attr_nguid.attr, + &dev_attr_eui.attr, + &dev_attr_nsid.attr, +#ifdef CONFIG_NVME_MULTIPATH + &dev_attr_ana_grpid.attr, + &dev_attr_ana_state.attr, +#endif + NULL, +}; + +static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids; + + if (a == &dev_attr_uuid.attr) { + if (uuid_is_null(&ids->uuid) && + !memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) + return 0; + } + if (a == &dev_attr_nguid.attr) { + if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) + return 0; + } + if (a == &dev_attr_eui.attr) { + if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) + return 0; + } +#ifdef CONFIG_NVME_MULTIPATH + if (a == &dev_attr_ana_grpid.attr || a == &dev_attr_ana_state.attr) { + if (dev_to_disk(dev)->fops != &nvme_fops) /* per-path attr */ + return 0; + if (!nvme_ctrl_use_ana(nvme_get_ns_from_dev(dev)->ctrl)) + return 0; + } +#endif + return a->mode; +} + +const struct attribute_group nvme_ns_id_attr_group = { + .attrs = nvme_ns_id_attrs, + .is_visible = nvme_ns_id_attrs_are_visible, +}; + +const struct attribute_group *nvme_ns_id_attr_groups[] = { + &nvme_ns_id_attr_group, +#ifdef CONFIG_NVM + &nvme_nvm_attr_group, +#endif + NULL, +}; + +#define nvme_show_str_function(field) \ +static ssize_t field##_show(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \ + return sprintf(buf, "%.*s\n", \ + (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \ +} \ +static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); + +nvme_show_str_function(model); +nvme_show_str_function(serial); +nvme_show_str_function(firmware_rev); + +#define nvme_show_int_function(field) \ +static ssize_t field##_show(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \ + return sprintf(buf, "%d\n", ctrl->field); \ +} \ +static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); + +nvme_show_int_function(cntlid); + +static ssize_t nvme_sysfs_delete(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + + /* Can't delete non-created controllers */ + if (!ctrl->created) + return -EBUSY; + + if (device_remove_file_self(dev, attr)) + nvme_delete_ctrl_sync(ctrl); + return count; +} +static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete); + +static ssize_t nvme_sysfs_show_transport(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + + return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name); +} +static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL); + +static ssize_t nvme_sysfs_show_state(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + static const char *const state_name[] = { + [NVME_CTRL_NEW] = "new", + [NVME_CTRL_LIVE] = "live", + [NVME_CTRL_ADMIN_ONLY] = "only-admin", + [NVME_CTRL_RESETTING] = "resetting", + [NVME_CTRL_CONNECTING] = "connecting", + [NVME_CTRL_DELETING] = "deleting", + [NVME_CTRL_DEAD] = "dead", + }; + + if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) && + state_name[ctrl->state]) + return sprintf(buf, "%s\n", state_name[ctrl->state]); + + return sprintf(buf, "unknown state\n"); +} + +static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL); + +static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + + return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn); +} +static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL); + +static ssize_t nvme_sysfs_show_address(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + + return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE); +} +static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL); + +static struct attribute *nvme_dev_attrs[] = { + &dev_attr_reset_controller.attr, + &dev_attr_rescan_controller.attr, + &dev_attr_model.attr, + &dev_attr_serial.attr, + &dev_attr_firmware_rev.attr, + &dev_attr_cntlid.attr, + &dev_attr_delete_controller.attr, + &dev_attr_transport.attr, + &dev_attr_subsysnqn.attr, + &dev_attr_address.attr, + &dev_attr_state.attr, + NULL +}; + +static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct nvme_ctrl *ctrl = dev_get_drvdata(dev); + + if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl) + return 0; + if (a == &dev_attr_address.attr && !ctrl->ops->get_address) + return 0; + + return a->mode; +} + +static struct attribute_group nvme_dev_attrs_group = { + .attrs = nvme_dev_attrs, + .is_visible = nvme_dev_attrs_are_visible, +}; + +static const struct attribute_group *nvme_dev_attr_groups[] = { + &nvme_dev_attrs_group, + NULL, +}; + +static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys, + unsigned nsid) +{ + struct nvme_ns_head *h; + + lockdep_assert_held(&subsys->lock); + + list_for_each_entry(h, &subsys->nsheads, entry) { + if (h->ns_id == nsid && kref_get_unless_zero(&h->ref)) + return h; + } + + return NULL; +} + +static int __nvme_check_ids(struct nvme_subsystem *subsys, + struct nvme_ns_head *new) +{ + struct nvme_ns_head *h; + + lockdep_assert_held(&subsys->lock); + + list_for_each_entry(h, &subsys->nsheads, entry) { + if (nvme_ns_ids_valid(&new->ids) && + !list_empty(&h->list) && + nvme_ns_ids_equal(&new->ids, &h->ids)) + return -EINVAL; + } + + return 0; +} + +static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, + unsigned nsid, struct nvme_id_ns *id) +{ + struct nvme_ns_head *head; + int ret = -ENOMEM; + + head = kzalloc(sizeof(*head), GFP_KERNEL); + if (!head) + goto out; + ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL); + if (ret < 0) + goto out_free_head; + head->instance = ret; + INIT_LIST_HEAD(&head->list); + ret = init_srcu_struct(&head->srcu); + if (ret) + goto out_ida_remove; + head->subsys = ctrl->subsys; + head->ns_id = nsid; + kref_init(&head->ref); + + nvme_report_ns_ids(ctrl, nsid, id, &head->ids); + + ret = __nvme_check_ids(ctrl->subsys, head); + if (ret) { + dev_err(ctrl->device, + "duplicate IDs for nsid %d\n", nsid); + goto out_cleanup_srcu; + } + + ret = nvme_mpath_alloc_disk(ctrl, head); + if (ret) + goto out_cleanup_srcu; + + list_add_tail(&head->entry, &ctrl->subsys->nsheads); + + kref_get(&ctrl->subsys->ref); + + return head; +out_cleanup_srcu: + cleanup_srcu_struct(&head->srcu); +out_ida_remove: + ida_simple_remove(&ctrl->subsys->ns_ida, head->instance); +out_free_head: + kfree(head); +out: + return ERR_PTR(ret); +} + +static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid, + struct nvme_id_ns *id) +{ + struct nvme_ctrl *ctrl = ns->ctrl; + bool is_shared = id->nmic & (1 << 0); + struct nvme_ns_head *head = NULL; + int ret = 0; + + mutex_lock(&ctrl->subsys->lock); + if (is_shared) + head = __nvme_find_ns_head(ctrl->subsys, nsid); + if (!head) { + head = nvme_alloc_ns_head(ctrl, nsid, id); + if (IS_ERR(head)) { + ret = PTR_ERR(head); + goto out_unlock; + } + } else { + struct nvme_ns_ids ids; + + nvme_report_ns_ids(ctrl, nsid, id, &ids); + if (!nvme_ns_ids_equal(&head->ids, &ids)) { + dev_err(ctrl->device, + "IDs don't match for shared namespace %d\n", + nsid); + ret = -EINVAL; + goto out_unlock; + } + } + + list_add_tail(&ns->siblings, &head->list); + ns->head = head; + +out_unlock: + mutex_unlock(&ctrl->subsys->lock); + return ret; +} + +static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) +{ + struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); + struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); + + return nsa->head->ns_id - nsb->head->ns_id; +} + +static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid) +{ + struct nvme_ns *ns, *ret = NULL; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) { + if (ns->head->ns_id == nsid) { + if (!kref_get_unless_zero(&ns->kref)) + continue; + ret = ns; + break; + } + if (ns->head->ns_id > nsid) + break; + } + up_read(&ctrl->namespaces_rwsem); + return ret; +} + +static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns) +{ + struct streams_directive_params s; + int ret; + + if (!ctrl->nr_streams) + return 0; + + ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id); + if (ret) + return ret; + + ns->sws = le32_to_cpu(s.sws); + ns->sgs = le16_to_cpu(s.sgs); + + if (ns->sws) { + unsigned int bs = 1 << ns->lba_shift; + + blk_queue_io_min(ns->queue, bs * ns->sws); + if (ns->sgs) + blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs); + } + + return 0; +} + +static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) +{ + struct nvme_ns *ns; + struct gendisk *disk; + struct nvme_id_ns *id; + char disk_name[DISK_NAME_LEN]; + int node = dev_to_node(ctrl->dev), flags = GENHD_FL_EXT_DEVT; + + ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); + if (!ns) + return; + + ns->queue = blk_mq_init_queue(ctrl->tagset); + if (IS_ERR(ns->queue)) + goto out_free_ns; + blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue); + ns->queue->queuedata = ns; + ns->ctrl = ctrl; + + kref_init(&ns->kref); + ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ + + blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); + nvme_set_queue_limits(ctrl, ns->queue); + + id = nvme_identify_ns(ctrl, nsid); + if (!id) + goto out_free_queue; + + if (id->ncap == 0) + goto out_free_id; + + if (nvme_init_ns_head(ns, nsid, id)) + goto out_free_id; + nvme_setup_streams_ns(ctrl, ns); + nvme_set_disk_name(disk_name, ns, ctrl, &flags); + + if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) { + if (nvme_nvm_register(ns, disk_name, node)) { + dev_warn(ctrl->device, "LightNVM init failure\n"); + goto out_unlink_ns; + } + } + + disk = alloc_disk_node(0, node); + if (!disk) + goto out_unlink_ns; + + disk->fops = &nvme_fops; + disk->private_data = ns; + disk->queue = ns->queue; + disk->flags = flags; + memcpy(disk->disk_name, disk_name, DISK_NAME_LEN); + ns->disk = disk; + + __nvme_revalidate_disk(disk, id); + + down_write(&ctrl->namespaces_rwsem); + list_add_tail(&ns->list, &ctrl->namespaces); + up_write(&ctrl->namespaces_rwsem); + + nvme_get_ctrl(ctrl); + + device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups); + + nvme_mpath_add_disk(ns, id); + nvme_fault_inject_init(ns); + kfree(id); + + return; + out_unlink_ns: + mutex_lock(&ctrl->subsys->lock); + list_del_rcu(&ns->siblings); + mutex_unlock(&ctrl->subsys->lock); + out_free_id: + kfree(id); + out_free_queue: + blk_cleanup_queue(ns->queue); + out_free_ns: + kfree(ns); +} + +static void nvme_ns_remove(struct nvme_ns *ns) +{ + if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags)) + return; + + nvme_fault_inject_fini(ns); + + mutex_lock(&ns->ctrl->subsys->lock); + list_del_rcu(&ns->siblings); + mutex_unlock(&ns->ctrl->subsys->lock); + synchronize_rcu(); /* guarantee not available in head->list */ + nvme_mpath_clear_current_path(ns); + synchronize_srcu(&ns->head->srcu); /* wait for concurrent submissions */ + + if (ns->disk && ns->disk->flags & GENHD_FL_UP) { + del_gendisk(ns->disk); + blk_cleanup_queue(ns->queue); + if (blk_get_integrity(ns->disk)) + blk_integrity_unregister(ns->disk); + } + + down_write(&ns->ctrl->namespaces_rwsem); + list_del_init(&ns->list); + up_write(&ns->ctrl->namespaces_rwsem); + + nvme_mpath_check_last_path(ns); + nvme_put_ns(ns); +} + +static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid) +{ + struct nvme_ns *ns; + + ns = nvme_find_get_ns(ctrl, nsid); + if (ns) { + if (ns->disk && revalidate_disk(ns->disk)) + nvme_ns_remove(ns); + nvme_put_ns(ns); + } else + nvme_alloc_ns(ctrl, nsid); +} + +static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, + unsigned nsid) +{ + struct nvme_ns *ns, *next; + LIST_HEAD(rm_list); + + down_write(&ctrl->namespaces_rwsem); + list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) { + if (ns->head->ns_id > nsid || test_bit(NVME_NS_DEAD, &ns->flags)) + list_move_tail(&ns->list, &rm_list); + } + up_write(&ctrl->namespaces_rwsem); + + list_for_each_entry_safe(ns, next, &rm_list, list) + nvme_ns_remove(ns); + +} + +static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn) +{ + struct nvme_ns *ns; + __le32 *ns_list; + unsigned i, j, nsid, prev = 0; + unsigned num_lists = DIV_ROUND_UP_ULL((u64)nn, 1024); + int ret = 0; + + ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL); + if (!ns_list) + return -ENOMEM; + + for (i = 0; i < num_lists; i++) { + ret = nvme_identify_ns_list(ctrl, prev, ns_list); + if (ret) + goto free; + + for (j = 0; j < min(nn, 1024U); j++) { + nsid = le32_to_cpu(ns_list[j]); + if (!nsid) + goto out; + + nvme_validate_ns(ctrl, nsid); + + while (++prev < nsid) { + ns = nvme_find_get_ns(ctrl, prev); + if (ns) { + nvme_ns_remove(ns); + nvme_put_ns(ns); + } + } + } + nn -= j; + } + out: + nvme_remove_invalid_namespaces(ctrl, prev); + free: + kfree(ns_list); + return ret; +} + +static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn) +{ + unsigned i; + + for (i = 1; i <= nn; i++) + nvme_validate_ns(ctrl, i); + + nvme_remove_invalid_namespaces(ctrl, nn); +} + +static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl) +{ + size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32); + __le32 *log; + int error; + + log = kzalloc(log_size, GFP_KERNEL); + if (!log) + return; + + /* + * We need to read the log to clear the AEN, but we don't want to rely + * on it for the changed namespace information as userspace could have + * raced with us in reading the log page, which could cause us to miss + * updates. + */ + error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CHANGED_NS, 0, log, + log_size, 0); + if (error) + dev_warn(ctrl->device, + "reading changed ns log failed: %d\n", error); + + kfree(log); +} + +static void nvme_scan_work(struct work_struct *work) +{ + struct nvme_ctrl *ctrl = + container_of(work, struct nvme_ctrl, scan_work); + struct nvme_id_ctrl *id; + unsigned nn; + + if (ctrl->state != NVME_CTRL_LIVE) + return; + + WARN_ON_ONCE(!ctrl->tagset); + + if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) { + dev_info(ctrl->device, "rescanning namespaces.\n"); + nvme_clear_changed_ns_log(ctrl); + } + + if (nvme_identify_ctrl(ctrl, &id)) + return; + + mutex_lock(&ctrl->scan_lock); + nn = le32_to_cpu(id->nn); + if (!nvme_ctrl_limited_cns(ctrl)) { + if (!nvme_scan_ns_list(ctrl, nn)) + goto out_free_id; + } + nvme_scan_ns_sequential(ctrl, nn); +out_free_id: + mutex_unlock(&ctrl->scan_lock); + kfree(id); + down_write(&ctrl->namespaces_rwsem); + list_sort(NULL, &ctrl->namespaces, ns_cmp); + up_write(&ctrl->namespaces_rwsem); +} + +/* + * This function iterates the namespace list unlocked to allow recovery from + * controller failure. It is up to the caller to ensure the namespace list is + * not modified by scan work while this function is executing. + */ +void nvme_remove_namespaces(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns, *next; + LIST_HEAD(ns_list); + + /* prevent racing with ns scanning */ + flush_work(&ctrl->scan_work); + + /* + * The dead states indicates the controller was not gracefully + * disconnected. In that case, we won't be able to flush any data while + * removing the namespaces' disks; fail all the queues now to avoid + * potentially having to clean up the failed sync later. + */ + if (ctrl->state == NVME_CTRL_DEAD) + nvme_kill_queues(ctrl); + + down_write(&ctrl->namespaces_rwsem); + list_splice_init(&ctrl->namespaces, &ns_list); + up_write(&ctrl->namespaces_rwsem); + + list_for_each_entry_safe(ns, next, &ns_list, list) + nvme_ns_remove(ns); +} +EXPORT_SYMBOL_GPL(nvme_remove_namespaces); + +static void nvme_aen_uevent(struct nvme_ctrl *ctrl) +{ + char *envp[2] = { NULL, NULL }; + u32 aen_result = ctrl->aen_result; + + ctrl->aen_result = 0; + if (!aen_result) + return; + + envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result); + if (!envp[0]) + return; + kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp); + kfree(envp[0]); +} + +static void nvme_async_event_work(struct work_struct *work) +{ + struct nvme_ctrl *ctrl = + container_of(work, struct nvme_ctrl, async_event_work); + + nvme_aen_uevent(ctrl); + + /* + * The transport drivers must guarantee AER submission here is safe by + * flushing ctrl async_event_work after changing the controller state + * from LIVE and before freeing the admin queue. + */ + if (ctrl->state == NVME_CTRL_LIVE) + ctrl->ops->submit_async_event(ctrl); +} + +static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl) +{ + + u32 csts; + + if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) + return false; + + if (csts == ~0) + return false; + + return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP)); +} + +static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl) +{ + struct nvme_fw_slot_info_log *log; + + log = kmalloc(sizeof(*log), GFP_KERNEL); + if (!log) + return; + + if (nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_FW_SLOT, 0, log, + sizeof(*log), 0)) + dev_warn(ctrl->device, "Get FW SLOT INFO log error\n"); + kfree(log); +} + +static void nvme_fw_act_work(struct work_struct *work) +{ + struct nvme_ctrl *ctrl = container_of(work, + struct nvme_ctrl, fw_act_work); + unsigned long fw_act_timeout; + + if (ctrl->mtfa) + fw_act_timeout = jiffies + + msecs_to_jiffies(ctrl->mtfa * 100); + else + fw_act_timeout = jiffies + + msecs_to_jiffies(admin_timeout * 1000); + + nvme_stop_queues(ctrl); + while (nvme_ctrl_pp_status(ctrl)) { + if (time_after(jiffies, fw_act_timeout)) { + dev_warn(ctrl->device, + "Fw activation timeout, reset controller\n"); + nvme_reset_ctrl(ctrl); + break; + } + msleep(100); + } + + if (ctrl->state != NVME_CTRL_LIVE) + return; + + nvme_start_queues(ctrl); + /* read FW slot information to clear the AER */ + nvme_get_fw_slot_info(ctrl); +} + +static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result) +{ + switch ((result & 0xff00) >> 8) { + case NVME_AER_NOTICE_NS_CHANGED: + set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events); + nvme_queue_scan(ctrl); + break; + case NVME_AER_NOTICE_FW_ACT_STARTING: + queue_work(nvme_wq, &ctrl->fw_act_work); + break; +#ifdef CONFIG_NVME_MULTIPATH + case NVME_AER_NOTICE_ANA: + if (!ctrl->ana_log_buf) + break; + queue_work(nvme_wq, &ctrl->ana_work); + break; +#endif + default: + dev_warn(ctrl->device, "async event result %08x\n", result); + } +} + +void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status, + volatile union nvme_result *res) +{ + u32 result = le32_to_cpu(res->u32); + + if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS) + return; + + switch (result & 0x7) { + case NVME_AER_NOTICE: + nvme_handle_aen_notice(ctrl, result); + break; + case NVME_AER_ERROR: + case NVME_AER_SMART: + case NVME_AER_CSS: + case NVME_AER_VS: + ctrl->aen_result = result; + break; + default: + break; + } + queue_work(nvme_wq, &ctrl->async_event_work); +} +EXPORT_SYMBOL_GPL(nvme_complete_async_event); + +void nvme_stop_ctrl(struct nvme_ctrl *ctrl) +{ + nvme_mpath_stop(ctrl); + nvme_stop_keep_alive(ctrl); + flush_work(&ctrl->async_event_work); + cancel_work_sync(&ctrl->fw_act_work); + if (ctrl->ops->stop_ctrl) + ctrl->ops->stop_ctrl(ctrl); +} +EXPORT_SYMBOL_GPL(nvme_stop_ctrl); + +void nvme_start_ctrl(struct nvme_ctrl *ctrl) +{ + if (ctrl->kato) + nvme_start_keep_alive(ctrl); + + if (ctrl->queue_count > 1) { + nvme_queue_scan(ctrl); + nvme_enable_aen(ctrl); + queue_work(nvme_wq, &ctrl->async_event_work); + nvme_start_queues(ctrl); + } + ctrl->created = true; +} +EXPORT_SYMBOL_GPL(nvme_start_ctrl); + +void nvme_uninit_ctrl(struct nvme_ctrl *ctrl) +{ + dev_pm_qos_hide_latency_tolerance(ctrl->device); + cdev_device_del(&ctrl->cdev, ctrl->device); +} +EXPORT_SYMBOL_GPL(nvme_uninit_ctrl); + +static void nvme_free_ctrl(struct device *dev) +{ + struct nvme_ctrl *ctrl = + container_of(dev, struct nvme_ctrl, ctrl_device); + struct nvme_subsystem *subsys = ctrl->subsys; + + ida_simple_remove(&nvme_instance_ida, ctrl->instance); + kfree(ctrl->effects); + nvme_mpath_uninit(ctrl); + __free_page(ctrl->discard_page); + + if (subsys) { + mutex_lock(&subsys->lock); + list_del(&ctrl->subsys_entry); + mutex_unlock(&subsys->lock); + sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device)); + } + + ctrl->ops->free_ctrl(ctrl); + + if (subsys) + nvme_put_subsystem(subsys); +} + +/* + * Initialize a NVMe controller structures. This needs to be called during + * earliest initialization so that we have the initialized structured around + * during probing. + */ +int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, + const struct nvme_ctrl_ops *ops, unsigned long quirks) +{ + int ret; + + ctrl->state = NVME_CTRL_NEW; + spin_lock_init(&ctrl->lock); + mutex_init(&ctrl->scan_lock); + INIT_LIST_HEAD(&ctrl->namespaces); + init_rwsem(&ctrl->namespaces_rwsem); + ctrl->dev = dev; + ctrl->ops = ops; + ctrl->quirks = quirks; + INIT_WORK(&ctrl->scan_work, nvme_scan_work); + INIT_WORK(&ctrl->async_event_work, nvme_async_event_work); + INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work); + INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work); + + INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work); + memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd)); + ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive; + + BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) > + PAGE_SIZE); + ctrl->discard_page = alloc_page(GFP_KERNEL); + if (!ctrl->discard_page) { + ret = -ENOMEM; + goto out; + } + + ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL); + if (ret < 0) + goto out; + ctrl->instance = ret; + + device_initialize(&ctrl->ctrl_device); + ctrl->device = &ctrl->ctrl_device; + ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance); + ctrl->device->class = nvme_class; + ctrl->device->parent = ctrl->dev; + ctrl->device->groups = nvme_dev_attr_groups; + ctrl->device->release = nvme_free_ctrl; + dev_set_drvdata(ctrl->device, ctrl); + ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance); + if (ret) + goto out_release_instance; + + cdev_init(&ctrl->cdev, &nvme_dev_fops); + ctrl->cdev.owner = ops->module; + ret = cdev_device_add(&ctrl->cdev, ctrl->device); + if (ret) + goto out_free_name; + + /* + * Initialize latency tolerance controls. The sysfs files won't + * be visible to userspace unless the device actually supports APST. + */ + ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance; + dev_pm_qos_update_user_latency_tolerance(ctrl->device, + min(default_ps_max_latency_us, (unsigned long)S32_MAX)); + + return 0; +out_free_name: + kfree_const(ctrl->device->kobj.name); +out_release_instance: + ida_simple_remove(&nvme_instance_ida, ctrl->instance); +out: + if (ctrl->discard_page) + __free_page(ctrl->discard_page); + return ret; +} +EXPORT_SYMBOL_GPL(nvme_init_ctrl); + +/** + * nvme_kill_queues(): Ends all namespace queues + * @ctrl: the dead controller that needs to end + * + * Call this function when the driver determines it is unable to get the + * controller in a state capable of servicing IO. + */ +void nvme_kill_queues(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + + /* Forcibly unquiesce queues to avoid blocking dispatch */ + if (ctrl->admin_q && !blk_queue_dying(ctrl->admin_q)) + blk_mq_unquiesce_queue(ctrl->admin_q); + + list_for_each_entry(ns, &ctrl->namespaces, list) + nvme_set_queue_dying(ns); + + up_read(&ctrl->namespaces_rwsem); +} +EXPORT_SYMBOL_GPL(nvme_kill_queues); + +void nvme_unfreeze(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) + blk_mq_unfreeze_queue(ns->queue); + up_read(&ctrl->namespaces_rwsem); +} +EXPORT_SYMBOL_GPL(nvme_unfreeze); + +void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) { + timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout); + if (timeout <= 0) + break; + } + up_read(&ctrl->namespaces_rwsem); +} +EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout); + +void nvme_wait_freeze(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) + blk_mq_freeze_queue_wait(ns->queue); + up_read(&ctrl->namespaces_rwsem); +} +EXPORT_SYMBOL_GPL(nvme_wait_freeze); + +void nvme_start_freeze(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) + blk_freeze_queue_start(ns->queue); + up_read(&ctrl->namespaces_rwsem); +} +EXPORT_SYMBOL_GPL(nvme_start_freeze); + +void nvme_stop_queues(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) + blk_mq_quiesce_queue(ns->queue); + up_read(&ctrl->namespaces_rwsem); +} +EXPORT_SYMBOL_GPL(nvme_stop_queues); + +void nvme_start_queues(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) + blk_mq_unquiesce_queue(ns->queue); + up_read(&ctrl->namespaces_rwsem); +} +EXPORT_SYMBOL_GPL(nvme_start_queues); + +int __init nvme_core_init(void) +{ + int result = -ENOMEM; + + nvme_wq = alloc_workqueue("nvme-wq", + WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); + if (!nvme_wq) + goto out; + + nvme_reset_wq = alloc_workqueue("nvme-reset-wq", + WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); + if (!nvme_reset_wq) + goto destroy_wq; + + nvme_delete_wq = alloc_workqueue("nvme-delete-wq", + WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); + if (!nvme_delete_wq) + goto destroy_reset_wq; + + result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme"); + if (result < 0) + goto destroy_delete_wq; + + nvme_class = class_create(THIS_MODULE, "nvme"); + if (IS_ERR(nvme_class)) { + result = PTR_ERR(nvme_class); + goto unregister_chrdev; + } + + nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem"); + if (IS_ERR(nvme_subsys_class)) { + result = PTR_ERR(nvme_subsys_class); + goto destroy_class; + } + return 0; + +destroy_class: + class_destroy(nvme_class); +unregister_chrdev: + unregister_chrdev_region(nvme_chr_devt, NVME_MINORS); +destroy_delete_wq: + destroy_workqueue(nvme_delete_wq); +destroy_reset_wq: + destroy_workqueue(nvme_reset_wq); +destroy_wq: + destroy_workqueue(nvme_wq); +out: + return result; +} + +void nvme_core_exit(void) +{ + ida_destroy(&nvme_subsystems_ida); + class_destroy(nvme_subsys_class); + class_destroy(nvme_class); + unregister_chrdev_region(nvme_chr_devt, NVME_MINORS); + destroy_workqueue(nvme_delete_wq); + destroy_workqueue(nvme_reset_wq); + destroy_workqueue(nvme_wq); +} + +MODULE_LICENSE("GPL"); +MODULE_VERSION("1.0"); +module_init(nvme_core_init); +module_exit(nvme_core_exit); diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c new file mode 100644 index 000000000..3ae800e87 --- /dev/null +++ b/drivers/nvme/host/fabrics.c @@ -0,0 +1,1132 @@ +/* + * NVMe over Fabrics common host code. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/init.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/parser.h> +#include <linux/seq_file.h> +#include "nvme.h" +#include "fabrics.h" + +static LIST_HEAD(nvmf_transports); +static DECLARE_RWSEM(nvmf_transports_rwsem); + +static LIST_HEAD(nvmf_hosts); +static DEFINE_MUTEX(nvmf_hosts_mutex); + +static struct nvmf_host *nvmf_default_host; + +static struct nvmf_host *__nvmf_host_find(const char *hostnqn) +{ + struct nvmf_host *host; + + list_for_each_entry(host, &nvmf_hosts, list) { + if (!strcmp(host->nqn, hostnqn)) + return host; + } + + return NULL; +} + +static struct nvmf_host *nvmf_host_add(const char *hostnqn) +{ + struct nvmf_host *host; + + mutex_lock(&nvmf_hosts_mutex); + host = __nvmf_host_find(hostnqn); + if (host) { + kref_get(&host->ref); + goto out_unlock; + } + + host = kmalloc(sizeof(*host), GFP_KERNEL); + if (!host) + goto out_unlock; + + kref_init(&host->ref); + strlcpy(host->nqn, hostnqn, NVMF_NQN_SIZE); + + list_add_tail(&host->list, &nvmf_hosts); +out_unlock: + mutex_unlock(&nvmf_hosts_mutex); + return host; +} + +static struct nvmf_host *nvmf_host_default(void) +{ + struct nvmf_host *host; + + host = kmalloc(sizeof(*host), GFP_KERNEL); + if (!host) + return NULL; + + kref_init(&host->ref); + uuid_gen(&host->id); + snprintf(host->nqn, NVMF_NQN_SIZE, + "nqn.2014-08.org.nvmexpress:uuid:%pUb", &host->id); + + mutex_lock(&nvmf_hosts_mutex); + list_add_tail(&host->list, &nvmf_hosts); + mutex_unlock(&nvmf_hosts_mutex); + + return host; +} + +static void nvmf_host_destroy(struct kref *ref) +{ + struct nvmf_host *host = container_of(ref, struct nvmf_host, ref); + + mutex_lock(&nvmf_hosts_mutex); + list_del(&host->list); + mutex_unlock(&nvmf_hosts_mutex); + + kfree(host); +} + +static void nvmf_host_put(struct nvmf_host *host) +{ + if (host) + kref_put(&host->ref, nvmf_host_destroy); +} + +/** + * nvmf_get_address() - Get address/port + * @ctrl: Host NVMe controller instance which we got the address + * @buf: OUTPUT parameter that will contain the address/port + * @size: buffer size + */ +int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size) +{ + int len = 0; + + if (ctrl->opts->mask & NVMF_OPT_TRADDR) + len += snprintf(buf, size, "traddr=%s", ctrl->opts->traddr); + if (ctrl->opts->mask & NVMF_OPT_TRSVCID) + len += snprintf(buf + len, size - len, "%strsvcid=%s", + (len) ? "," : "", ctrl->opts->trsvcid); + if (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR) + len += snprintf(buf + len, size - len, "%shost_traddr=%s", + (len) ? "," : "", ctrl->opts->host_traddr); + len += snprintf(buf + len, size - len, "\n"); + + return len; +} +EXPORT_SYMBOL_GPL(nvmf_get_address); + +/** + * nvmf_reg_read32() - NVMe Fabrics "Property Get" API function. + * @ctrl: Host NVMe controller instance maintaining the admin + * queue used to submit the property read command to + * the allocated NVMe controller resource on the target system. + * @off: Starting offset value of the targeted property + * register (see the fabrics section of the NVMe standard). + * @val: OUTPUT parameter that will contain the value of + * the property after a successful read. + * + * Used by the host system to retrieve a 32-bit capsule property value + * from an NVMe controller on the target system. + * + * ("Capsule property" is an "PCIe register concept" applied to the + * NVMe fabrics space.) + * + * Return: + * 0: successful read + * > 0: NVMe error status code + * < 0: Linux errno error code + */ +int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) +{ + struct nvme_command cmd; + union nvme_result res; + int ret; + + memset(&cmd, 0, sizeof(cmd)); + cmd.prop_get.opcode = nvme_fabrics_command; + cmd.prop_get.fctype = nvme_fabrics_type_property_get; + cmd.prop_get.offset = cpu_to_le32(off); + + ret = __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, &res, NULL, 0, 0, + NVME_QID_ANY, 0, 0); + + if (ret >= 0) + *val = le64_to_cpu(res.u64); + if (unlikely(ret != 0)) + dev_err(ctrl->device, + "Property Get error: %d, offset %#x\n", + ret > 0 ? ret & ~NVME_SC_DNR : ret, off); + + return ret; +} +EXPORT_SYMBOL_GPL(nvmf_reg_read32); + +/** + * nvmf_reg_read64() - NVMe Fabrics "Property Get" API function. + * @ctrl: Host NVMe controller instance maintaining the admin + * queue used to submit the property read command to + * the allocated controller resource on the target system. + * @off: Starting offset value of the targeted property + * register (see the fabrics section of the NVMe standard). + * @val: OUTPUT parameter that will contain the value of + * the property after a successful read. + * + * Used by the host system to retrieve a 64-bit capsule property value + * from an NVMe controller on the target system. + * + * ("Capsule property" is an "PCIe register concept" applied to the + * NVMe fabrics space.) + * + * Return: + * 0: successful read + * > 0: NVMe error status code + * < 0: Linux errno error code + */ +int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) +{ + struct nvme_command cmd; + union nvme_result res; + int ret; + + memset(&cmd, 0, sizeof(cmd)); + cmd.prop_get.opcode = nvme_fabrics_command; + cmd.prop_get.fctype = nvme_fabrics_type_property_get; + cmd.prop_get.attrib = 1; + cmd.prop_get.offset = cpu_to_le32(off); + + ret = __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, &res, NULL, 0, 0, + NVME_QID_ANY, 0, 0); + + if (ret >= 0) + *val = le64_to_cpu(res.u64); + if (unlikely(ret != 0)) + dev_err(ctrl->device, + "Property Get error: %d, offset %#x\n", + ret > 0 ? ret & ~NVME_SC_DNR : ret, off); + return ret; +} +EXPORT_SYMBOL_GPL(nvmf_reg_read64); + +/** + * nvmf_reg_write32() - NVMe Fabrics "Property Write" API function. + * @ctrl: Host NVMe controller instance maintaining the admin + * queue used to submit the property read command to + * the allocated NVMe controller resource on the target system. + * @off: Starting offset value of the targeted property + * register (see the fabrics section of the NVMe standard). + * @val: Input parameter that contains the value to be + * written to the property. + * + * Used by the NVMe host system to write a 32-bit capsule property value + * to an NVMe controller on the target system. + * + * ("Capsule property" is an "PCIe register concept" applied to the + * NVMe fabrics space.) + * + * Return: + * 0: successful write + * > 0: NVMe error status code + * < 0: Linux errno error code + */ +int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) +{ + struct nvme_command cmd; + int ret; + + memset(&cmd, 0, sizeof(cmd)); + cmd.prop_set.opcode = nvme_fabrics_command; + cmd.prop_set.fctype = nvme_fabrics_type_property_set; + cmd.prop_set.attrib = 0; + cmd.prop_set.offset = cpu_to_le32(off); + cmd.prop_set.value = cpu_to_le64(val); + + ret = __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, NULL, 0, 0, + NVME_QID_ANY, 0, 0); + if (unlikely(ret)) + dev_err(ctrl->device, + "Property Set error: %d, offset %#x\n", + ret > 0 ? ret & ~NVME_SC_DNR : ret, off); + return ret; +} +EXPORT_SYMBOL_GPL(nvmf_reg_write32); + +/** + * nvmf_log_connect_error() - Error-parsing-diagnostic print + * out function for connect() errors. + * + * @ctrl: the specific /dev/nvmeX device that had the error. + * + * @errval: Error code to be decoded in a more human-friendly + * printout. + * + * @offset: For use with the NVMe error code NVME_SC_CONNECT_INVALID_PARAM. + * + * @cmd: This is the SQE portion of a submission capsule. + * + * @data: This is the "Data" portion of a submission capsule. + */ +static void nvmf_log_connect_error(struct nvme_ctrl *ctrl, + int errval, int offset, struct nvme_command *cmd, + struct nvmf_connect_data *data) +{ + int err_sctype = errval & (~NVME_SC_DNR); + + switch (err_sctype) { + + case (NVME_SC_CONNECT_INVALID_PARAM): + if (offset >> 16) { + char *inv_data = "Connect Invalid Data Parameter"; + + switch (offset & 0xffff) { + case (offsetof(struct nvmf_connect_data, cntlid)): + dev_err(ctrl->device, + "%s, cntlid: %d\n", + inv_data, data->cntlid); + break; + case (offsetof(struct nvmf_connect_data, hostnqn)): + dev_err(ctrl->device, + "%s, hostnqn \"%s\"\n", + inv_data, data->hostnqn); + break; + case (offsetof(struct nvmf_connect_data, subsysnqn)): + dev_err(ctrl->device, + "%s, subsysnqn \"%s\"\n", + inv_data, data->subsysnqn); + break; + default: + dev_err(ctrl->device, + "%s, starting byte offset: %d\n", + inv_data, offset & 0xffff); + break; + } + } else { + char *inv_sqe = "Connect Invalid SQE Parameter"; + + switch (offset) { + case (offsetof(struct nvmf_connect_command, qid)): + dev_err(ctrl->device, + "%s, qid %d\n", + inv_sqe, cmd->connect.qid); + break; + default: + dev_err(ctrl->device, + "%s, starting byte offset: %d\n", + inv_sqe, offset); + } + } + break; + + case NVME_SC_CONNECT_INVALID_HOST: + dev_err(ctrl->device, + "Connect for subsystem %s is not allowed, hostnqn: %s\n", + data->subsysnqn, data->hostnqn); + break; + + case NVME_SC_CONNECT_CTRL_BUSY: + dev_err(ctrl->device, + "Connect command failed: controller is busy or not available\n"); + break; + + case NVME_SC_CONNECT_FORMAT: + dev_err(ctrl->device, + "Connect incompatible format: %d", + cmd->connect.recfmt); + break; + + case NVME_SC_HOST_PATH_ERROR: + dev_err(ctrl->device, + "Connect command failed: host path error\n"); + break; + + default: + dev_err(ctrl->device, + "Connect command failed, error wo/DNR bit: %d\n", + err_sctype); + break; + } /* switch (err_sctype) */ +} + +/** + * nvmf_connect_admin_queue() - NVMe Fabrics Admin Queue "Connect" + * API function. + * @ctrl: Host nvme controller instance used to request + * a new NVMe controller allocation on the target + * system and establish an NVMe Admin connection to + * that controller. + * + * This function enables an NVMe host device to request a new allocation of + * an NVMe controller resource on a target system as well establish a + * fabrics-protocol connection of the NVMe Admin queue between the + * host system device and the allocated NVMe controller on the + * target system via a NVMe Fabrics "Connect" command. + * + * Return: + * 0: success + * > 0: NVMe error status code + * < 0: Linux errno error code + * + */ +int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl) +{ + struct nvme_command cmd; + union nvme_result res; + struct nvmf_connect_data *data; + int ret; + + memset(&cmd, 0, sizeof(cmd)); + cmd.connect.opcode = nvme_fabrics_command; + cmd.connect.fctype = nvme_fabrics_type_connect; + cmd.connect.qid = 0; + cmd.connect.sqsize = cpu_to_le16(NVME_AQ_DEPTH - 1); + + /* + * Set keep-alive timeout in seconds granularity (ms * 1000) + * and add a grace period for controller kato enforcement + */ + cmd.connect.kato = ctrl->opts->discovery_nqn ? 0 : + cpu_to_le32((ctrl->kato + NVME_KATO_GRACE) * 1000); + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + uuid_copy(&data->hostid, &ctrl->opts->host->id); + data->cntlid = cpu_to_le16(0xffff); + strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE); + strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE); + + ret = __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, &res, + data, sizeof(*data), 0, NVME_QID_ANY, 1, + BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT); + if (ret) { + nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32), + &cmd, data); + goto out_free_data; + } + + ctrl->cntlid = le16_to_cpu(res.u16); + +out_free_data: + kfree(data); + return ret; +} +EXPORT_SYMBOL_GPL(nvmf_connect_admin_queue); + +/** + * nvmf_connect_io_queue() - NVMe Fabrics I/O Queue "Connect" + * API function. + * @ctrl: Host nvme controller instance used to establish an + * NVMe I/O queue connection to the already allocated NVMe + * controller on the target system. + * @qid: NVMe I/O queue number for the new I/O connection between + * host and target (note qid == 0 is illegal as this is + * the Admin queue, per NVMe standard). + * + * This function issues a fabrics-protocol connection + * of a NVMe I/O queue (via NVMe Fabrics "Connect" command) + * between the host system device and the allocated NVMe controller + * on the target system. + * + * Return: + * 0: success + * > 0: NVMe error status code + * < 0: Linux errno error code + */ +int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid) +{ + struct nvme_command cmd; + struct nvmf_connect_data *data; + union nvme_result res; + int ret; + + memset(&cmd, 0, sizeof(cmd)); + cmd.connect.opcode = nvme_fabrics_command; + cmd.connect.fctype = nvme_fabrics_type_connect; + cmd.connect.qid = cpu_to_le16(qid); + cmd.connect.sqsize = cpu_to_le16(ctrl->sqsize); + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + uuid_copy(&data->hostid, &ctrl->opts->host->id); + data->cntlid = cpu_to_le16(ctrl->cntlid); + strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE); + strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE); + + ret = __nvme_submit_sync_cmd(ctrl->connect_q, &cmd, &res, + data, sizeof(*data), 0, qid, 1, + BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT); + if (ret) { + nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32), + &cmd, data); + } + kfree(data); + return ret; +} +EXPORT_SYMBOL_GPL(nvmf_connect_io_queue); + +bool nvmf_should_reconnect(struct nvme_ctrl *ctrl) +{ + if (ctrl->opts->max_reconnects == -1 || + ctrl->nr_reconnects < ctrl->opts->max_reconnects) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(nvmf_should_reconnect); + +/** + * nvmf_register_transport() - NVMe Fabrics Library registration function. + * @ops: Transport ops instance to be registered to the + * common fabrics library. + * + * API function that registers the type of specific transport fabric + * being implemented to the common NVMe fabrics library. Part of + * the overall init sequence of starting up a fabrics driver. + */ +int nvmf_register_transport(struct nvmf_transport_ops *ops) +{ + if (!ops->create_ctrl) + return -EINVAL; + + down_write(&nvmf_transports_rwsem); + list_add_tail(&ops->entry, &nvmf_transports); + up_write(&nvmf_transports_rwsem); + + return 0; +} +EXPORT_SYMBOL_GPL(nvmf_register_transport); + +/** + * nvmf_unregister_transport() - NVMe Fabrics Library unregistration function. + * @ops: Transport ops instance to be unregistered from the + * common fabrics library. + * + * Fabrics API function that unregisters the type of specific transport + * fabric being implemented from the common NVMe fabrics library. + * Part of the overall exit sequence of unloading the implemented driver. + */ +void nvmf_unregister_transport(struct nvmf_transport_ops *ops) +{ + down_write(&nvmf_transports_rwsem); + list_del(&ops->entry); + up_write(&nvmf_transports_rwsem); +} +EXPORT_SYMBOL_GPL(nvmf_unregister_transport); + +static struct nvmf_transport_ops *nvmf_lookup_transport( + struct nvmf_ctrl_options *opts) +{ + struct nvmf_transport_ops *ops; + + lockdep_assert_held(&nvmf_transports_rwsem); + + list_for_each_entry(ops, &nvmf_transports, entry) { + if (strcmp(ops->name, opts->transport) == 0) + return ops; + } + + return NULL; +} + +/* + * For something we're not in a state to send to the device the default action + * is to busy it and retry it after the controller state is recovered. However, + * if the controller is deleting or if anything is marked for failfast or + * nvme multipath it is immediately failed. + * + * Note: commands used to initialize the controller will be marked for failfast. + * Note: nvme cli/ioctl commands are marked for failfast. + */ +blk_status_t nvmf_fail_nonready_command(struct nvme_ctrl *ctrl, + struct request *rq) +{ + if (ctrl->state != NVME_CTRL_DELETING && + ctrl->state != NVME_CTRL_DEAD && + !blk_noretry_request(rq) && !(rq->cmd_flags & REQ_NVME_MPATH)) + return BLK_STS_RESOURCE; + + nvme_req(rq)->status = NVME_SC_HOST_PATH_ERROR; + blk_mq_start_request(rq); + nvme_complete_rq(rq); + return BLK_STS_OK; +} +EXPORT_SYMBOL_GPL(nvmf_fail_nonready_command); + +bool __nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq, + bool queue_live) +{ + struct nvme_request *req = nvme_req(rq); + + /* + * If we are in some state of setup or teardown only allow + * internally generated commands. + */ + if (!blk_rq_is_passthrough(rq) || (req->flags & NVME_REQ_USERCMD)) + return false; + + /* + * Only allow commands on a live queue, except for the connect command, + * which is require to set the queue live in the appropinquate states. + */ + switch (ctrl->state) { + case NVME_CTRL_CONNECTING: + if (req->cmd->common.opcode == nvme_fabrics_command && + req->cmd->fabrics.fctype == nvme_fabrics_type_connect) + return true; + break; + default: + break; + case NVME_CTRL_DEAD: + return false; + } + + return queue_live; +} +EXPORT_SYMBOL_GPL(__nvmf_check_ready); + +static const match_table_t opt_tokens = { + { NVMF_OPT_TRANSPORT, "transport=%s" }, + { NVMF_OPT_TRADDR, "traddr=%s" }, + { NVMF_OPT_TRSVCID, "trsvcid=%s" }, + { NVMF_OPT_NQN, "nqn=%s" }, + { NVMF_OPT_QUEUE_SIZE, "queue_size=%d" }, + { NVMF_OPT_NR_IO_QUEUES, "nr_io_queues=%d" }, + { NVMF_OPT_RECONNECT_DELAY, "reconnect_delay=%d" }, + { NVMF_OPT_CTRL_LOSS_TMO, "ctrl_loss_tmo=%d" }, + { NVMF_OPT_KATO, "keep_alive_tmo=%d" }, + { NVMF_OPT_HOSTNQN, "hostnqn=%s" }, + { NVMF_OPT_HOST_TRADDR, "host_traddr=%s" }, + { NVMF_OPT_HOST_ID, "hostid=%s" }, + { NVMF_OPT_DUP_CONNECT, "duplicate_connect" }, + { NVMF_OPT_ERR, NULL } +}; + +static int nvmf_parse_options(struct nvmf_ctrl_options *opts, + const char *buf) +{ + substring_t args[MAX_OPT_ARGS]; + char *options, *o, *p; + int token, ret = 0; + size_t nqnlen = 0; + int ctrl_loss_tmo = NVMF_DEF_CTRL_LOSS_TMO; + uuid_t hostid; + + /* Set defaults */ + opts->queue_size = NVMF_DEF_QUEUE_SIZE; + opts->nr_io_queues = num_online_cpus(); + opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY; + opts->kato = NVME_DEFAULT_KATO; + opts->duplicate_connect = false; + + options = o = kstrdup(buf, GFP_KERNEL); + if (!options) + return -ENOMEM; + + uuid_gen(&hostid); + + while ((p = strsep(&o, ",\n")) != NULL) { + if (!*p) + continue; + + token = match_token(p, opt_tokens, args); + opts->mask |= token; + switch (token) { + case NVMF_OPT_TRANSPORT: + p = match_strdup(args); + if (!p) { + ret = -ENOMEM; + goto out; + } + kfree(opts->transport); + opts->transport = p; + break; + case NVMF_OPT_NQN: + p = match_strdup(args); + if (!p) { + ret = -ENOMEM; + goto out; + } + kfree(opts->subsysnqn); + opts->subsysnqn = p; + nqnlen = strlen(opts->subsysnqn); + if (nqnlen >= NVMF_NQN_SIZE) { + pr_err("%s needs to be < %d bytes\n", + opts->subsysnqn, NVMF_NQN_SIZE); + ret = -EINVAL; + goto out; + } + opts->discovery_nqn = + !(strcmp(opts->subsysnqn, + NVME_DISC_SUBSYS_NAME)); + break; + case NVMF_OPT_TRADDR: + p = match_strdup(args); + if (!p) { + ret = -ENOMEM; + goto out; + } + kfree(opts->traddr); + opts->traddr = p; + break; + case NVMF_OPT_TRSVCID: + p = match_strdup(args); + if (!p) { + ret = -ENOMEM; + goto out; + } + kfree(opts->trsvcid); + opts->trsvcid = p; + break; + case NVMF_OPT_QUEUE_SIZE: + if (match_int(args, &token)) { + ret = -EINVAL; + goto out; + } + if (token < NVMF_MIN_QUEUE_SIZE || + token > NVMF_MAX_QUEUE_SIZE) { + pr_err("Invalid queue_size %d\n", token); + ret = -EINVAL; + goto out; + } + opts->queue_size = token; + break; + case NVMF_OPT_NR_IO_QUEUES: + if (match_int(args, &token)) { + ret = -EINVAL; + goto out; + } + if (token <= 0) { + pr_err("Invalid number of IOQs %d\n", token); + ret = -EINVAL; + goto out; + } + if (opts->discovery_nqn) { + pr_debug("Ignoring nr_io_queues value for discovery controller\n"); + break; + } + + opts->nr_io_queues = min_t(unsigned int, + num_online_cpus(), token); + break; + case NVMF_OPT_KATO: + if (match_int(args, &token)) { + ret = -EINVAL; + goto out; + } + + if (token < 0) { + pr_err("Invalid keep_alive_tmo %d\n", token); + ret = -EINVAL; + goto out; + } else if (token == 0 && !opts->discovery_nqn) { + /* Allowed for debug */ + pr_warn("keep_alive_tmo 0 won't execute keep alives!!!\n"); + } + opts->kato = token; + + if (opts->discovery_nqn && opts->kato) { + pr_err("Discovery controllers cannot accept KATO != 0\n"); + ret = -EINVAL; + goto out; + } + + break; + case NVMF_OPT_CTRL_LOSS_TMO: + if (match_int(args, &token)) { + ret = -EINVAL; + goto out; + } + + if (token < 0) + pr_warn("ctrl_loss_tmo < 0 will reconnect forever\n"); + ctrl_loss_tmo = token; + break; + case NVMF_OPT_HOSTNQN: + if (opts->host) { + pr_err("hostnqn already user-assigned: %s\n", + opts->host->nqn); + ret = -EADDRINUSE; + goto out; + } + p = match_strdup(args); + if (!p) { + ret = -ENOMEM; + goto out; + } + nqnlen = strlen(p); + if (nqnlen >= NVMF_NQN_SIZE) { + pr_err("%s needs to be < %d bytes\n", + p, NVMF_NQN_SIZE); + kfree(p); + ret = -EINVAL; + goto out; + } + nvmf_host_put(opts->host); + opts->host = nvmf_host_add(p); + kfree(p); + if (!opts->host) { + ret = -ENOMEM; + goto out; + } + break; + case NVMF_OPT_RECONNECT_DELAY: + if (match_int(args, &token)) { + ret = -EINVAL; + goto out; + } + if (token <= 0) { + pr_err("Invalid reconnect_delay %d\n", token); + ret = -EINVAL; + goto out; + } + opts->reconnect_delay = token; + break; + case NVMF_OPT_HOST_TRADDR: + p = match_strdup(args); + if (!p) { + ret = -ENOMEM; + goto out; + } + kfree(opts->host_traddr); + opts->host_traddr = p; + break; + case NVMF_OPT_HOST_ID: + p = match_strdup(args); + if (!p) { + ret = -ENOMEM; + goto out; + } + ret = uuid_parse(p, &hostid); + if (ret) { + pr_err("Invalid hostid %s\n", p); + ret = -EINVAL; + kfree(p); + goto out; + } + kfree(p); + break; + case NVMF_OPT_DUP_CONNECT: + opts->duplicate_connect = true; + break; + default: + pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n", + p); + ret = -EINVAL; + goto out; + } + } + + if (opts->discovery_nqn) { + opts->kato = 0; + opts->nr_io_queues = 0; + opts->duplicate_connect = true; + } + if (ctrl_loss_tmo < 0) + opts->max_reconnects = -1; + else + opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo, + opts->reconnect_delay); + + if (!opts->host) { + kref_get(&nvmf_default_host->ref); + opts->host = nvmf_default_host; + } + + uuid_copy(&opts->host->id, &hostid); + +out: + kfree(options); + return ret; +} + +static int nvmf_check_required_opts(struct nvmf_ctrl_options *opts, + unsigned int required_opts) +{ + if ((opts->mask & required_opts) != required_opts) { + int i; + + for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) { + if ((opt_tokens[i].token & required_opts) && + !(opt_tokens[i].token & opts->mask)) { + pr_warn("missing parameter '%s'\n", + opt_tokens[i].pattern); + } + } + + return -EINVAL; + } + + return 0; +} + +static int nvmf_check_allowed_opts(struct nvmf_ctrl_options *opts, + unsigned int allowed_opts) +{ + if (opts->mask & ~allowed_opts) { + int i; + + for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) { + if ((opt_tokens[i].token & opts->mask) && + (opt_tokens[i].token & ~allowed_opts)) { + pr_warn("invalid parameter '%s'\n", + opt_tokens[i].pattern); + } + } + + return -EINVAL; + } + + return 0; +} + +void nvmf_free_options(struct nvmf_ctrl_options *opts) +{ + nvmf_host_put(opts->host); + kfree(opts->transport); + kfree(opts->traddr); + kfree(opts->trsvcid); + kfree(opts->subsysnqn); + kfree(opts->host_traddr); + kfree(opts); +} +EXPORT_SYMBOL_GPL(nvmf_free_options); + +#define NVMF_REQUIRED_OPTS (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN) +#define NVMF_ALLOWED_OPTS (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \ + NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \ + NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT) + +static struct nvme_ctrl * +nvmf_create_ctrl(struct device *dev, const char *buf, size_t count) +{ + struct nvmf_ctrl_options *opts; + struct nvmf_transport_ops *ops; + struct nvme_ctrl *ctrl; + int ret; + + opts = kzalloc(sizeof(*opts), GFP_KERNEL); + if (!opts) + return ERR_PTR(-ENOMEM); + + ret = nvmf_parse_options(opts, buf); + if (ret) + goto out_free_opts; + + + request_module("nvme-%s", opts->transport); + + /* + * Check the generic options first as we need a valid transport for + * the lookup below. Then clear the generic flags so that transport + * drivers don't have to care about them. + */ + ret = nvmf_check_required_opts(opts, NVMF_REQUIRED_OPTS); + if (ret) + goto out_free_opts; + opts->mask &= ~NVMF_REQUIRED_OPTS; + + down_read(&nvmf_transports_rwsem); + ops = nvmf_lookup_transport(opts); + if (!ops) { + pr_info("no handler found for transport %s.\n", + opts->transport); + ret = -EINVAL; + goto out_unlock; + } + + if (!try_module_get(ops->module)) { + ret = -EBUSY; + goto out_unlock; + } + up_read(&nvmf_transports_rwsem); + + ret = nvmf_check_required_opts(opts, ops->required_opts); + if (ret) + goto out_module_put; + ret = nvmf_check_allowed_opts(opts, NVMF_ALLOWED_OPTS | + ops->allowed_opts | ops->required_opts); + if (ret) + goto out_module_put; + + ctrl = ops->create_ctrl(dev, opts); + if (IS_ERR(ctrl)) { + ret = PTR_ERR(ctrl); + goto out_module_put; + } + + module_put(ops->module); + return ctrl; + +out_module_put: + module_put(ops->module); + goto out_free_opts; +out_unlock: + up_read(&nvmf_transports_rwsem); +out_free_opts: + nvmf_free_options(opts); + return ERR_PTR(ret); +} + +static struct class *nvmf_class; +static struct device *nvmf_device; +static DEFINE_MUTEX(nvmf_dev_mutex); + +static ssize_t nvmf_dev_write(struct file *file, const char __user *ubuf, + size_t count, loff_t *pos) +{ + struct seq_file *seq_file = file->private_data; + struct nvme_ctrl *ctrl; + const char *buf; + int ret = 0; + + if (count > PAGE_SIZE) + return -ENOMEM; + + buf = memdup_user_nul(ubuf, count); + if (IS_ERR(buf)) + return PTR_ERR(buf); + + mutex_lock(&nvmf_dev_mutex); + if (seq_file->private) { + ret = -EINVAL; + goto out_unlock; + } + + ctrl = nvmf_create_ctrl(nvmf_device, buf, count); + if (IS_ERR(ctrl)) { + ret = PTR_ERR(ctrl); + goto out_unlock; + } + + seq_file->private = ctrl; + +out_unlock: + mutex_unlock(&nvmf_dev_mutex); + kfree(buf); + return ret ? ret : count; +} + +static int nvmf_dev_show(struct seq_file *seq_file, void *private) +{ + struct nvme_ctrl *ctrl; + int ret = 0; + + mutex_lock(&nvmf_dev_mutex); + ctrl = seq_file->private; + if (!ctrl) { + ret = -EINVAL; + goto out_unlock; + } + + seq_printf(seq_file, "instance=%d,cntlid=%d\n", + ctrl->instance, ctrl->cntlid); + +out_unlock: + mutex_unlock(&nvmf_dev_mutex); + return ret; +} + +static int nvmf_dev_open(struct inode *inode, struct file *file) +{ + /* + * The miscdevice code initializes file->private_data, but doesn't + * make use of it later. + */ + file->private_data = NULL; + return single_open(file, nvmf_dev_show, NULL); +} + +static int nvmf_dev_release(struct inode *inode, struct file *file) +{ + struct seq_file *seq_file = file->private_data; + struct nvme_ctrl *ctrl = seq_file->private; + + if (ctrl) + nvme_put_ctrl(ctrl); + return single_release(inode, file); +} + +static const struct file_operations nvmf_dev_fops = { + .owner = THIS_MODULE, + .write = nvmf_dev_write, + .read = seq_read, + .open = nvmf_dev_open, + .release = nvmf_dev_release, +}; + +static struct miscdevice nvmf_misc = { + .minor = MISC_DYNAMIC_MINOR, + .name = "nvme-fabrics", + .fops = &nvmf_dev_fops, +}; + +static int __init nvmf_init(void) +{ + int ret; + + nvmf_default_host = nvmf_host_default(); + if (!nvmf_default_host) + return -ENOMEM; + + nvmf_class = class_create(THIS_MODULE, "nvme-fabrics"); + if (IS_ERR(nvmf_class)) { + pr_err("couldn't register class nvme-fabrics\n"); + ret = PTR_ERR(nvmf_class); + goto out_free_host; + } + + nvmf_device = + device_create(nvmf_class, NULL, MKDEV(0, 0), NULL, "ctl"); + if (IS_ERR(nvmf_device)) { + pr_err("couldn't create nvme-fabris device!\n"); + ret = PTR_ERR(nvmf_device); + goto out_destroy_class; + } + + ret = misc_register(&nvmf_misc); + if (ret) { + pr_err("couldn't register misc device: %d\n", ret); + goto out_destroy_device; + } + + return 0; + +out_destroy_device: + device_destroy(nvmf_class, MKDEV(0, 0)); +out_destroy_class: + class_destroy(nvmf_class); +out_free_host: + nvmf_host_put(nvmf_default_host); + return ret; +} + +static void __exit nvmf_exit(void) +{ + misc_deregister(&nvmf_misc); + device_destroy(nvmf_class, MKDEV(0, 0)); + class_destroy(nvmf_class); + nvmf_host_put(nvmf_default_host); + + BUILD_BUG_ON(sizeof(struct nvmf_connect_command) != 64); + BUILD_BUG_ON(sizeof(struct nvmf_property_get_command) != 64); + BUILD_BUG_ON(sizeof(struct nvmf_property_set_command) != 64); + BUILD_BUG_ON(sizeof(struct nvmf_connect_data) != 1024); +} + +MODULE_LICENSE("GPL v2"); + +module_init(nvmf_init); +module_exit(nvmf_exit); diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h new file mode 100644 index 000000000..aa2fdb2a2 --- /dev/null +++ b/drivers/nvme/host/fabrics.h @@ -0,0 +1,179 @@ +/* + * NVMe over Fabrics common host code. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#ifndef _NVME_FABRICS_H +#define _NVME_FABRICS_H 1 + +#include <linux/in.h> +#include <linux/inet.h> + +#define NVMF_MIN_QUEUE_SIZE 16 +#define NVMF_MAX_QUEUE_SIZE 1024 +#define NVMF_DEF_QUEUE_SIZE 128 +#define NVMF_DEF_RECONNECT_DELAY 10 +/* default to 600 seconds of reconnect attempts before giving up */ +#define NVMF_DEF_CTRL_LOSS_TMO 600 + +/* + * Define a host as seen by the target. We allocate one at boot, but also + * allow the override it when creating controllers. This is both to provide + * persistence of the Host NQN over multiple boots, and to allow using + * multiple ones, for example in a container scenario. Because we must not + * use different Host NQNs with the same Host ID we generate a Host ID and + * use this structure to keep track of the relation between the two. + */ +struct nvmf_host { + struct kref ref; + struct list_head list; + char nqn[NVMF_NQN_SIZE]; + uuid_t id; +}; + +/** + * enum nvmf_parsing_opts - used to define the sysfs parsing options used. + */ +enum { + NVMF_OPT_ERR = 0, + NVMF_OPT_TRANSPORT = 1 << 0, + NVMF_OPT_NQN = 1 << 1, + NVMF_OPT_TRADDR = 1 << 2, + NVMF_OPT_TRSVCID = 1 << 3, + NVMF_OPT_QUEUE_SIZE = 1 << 4, + NVMF_OPT_NR_IO_QUEUES = 1 << 5, + NVMF_OPT_TL_RETRY_COUNT = 1 << 6, + NVMF_OPT_KATO = 1 << 7, + NVMF_OPT_HOSTNQN = 1 << 8, + NVMF_OPT_RECONNECT_DELAY = 1 << 9, + NVMF_OPT_HOST_TRADDR = 1 << 10, + NVMF_OPT_CTRL_LOSS_TMO = 1 << 11, + NVMF_OPT_HOST_ID = 1 << 12, + NVMF_OPT_DUP_CONNECT = 1 << 13, +}; + +/** + * struct nvmf_ctrl_options - Used to hold the options specified + * with the parsing opts enum. + * @mask: Used by the fabrics library to parse through sysfs options + * on adding a NVMe controller. + * @transport: Holds the fabric transport "technology name" (for a lack of + * better description) that will be used by an NVMe controller + * being added. + * @subsysnqn: Hold the fully qualified NQN subystem name (format defined + * in the NVMe specification, "NVMe Qualified Names"). + * @traddr: The transport-specific TRADDR field for a port on the + * subsystem which is adding a controller. + * @trsvcid: The transport-specific TRSVCID field for a port on the + * subsystem which is adding a controller. + * @host_traddr: A transport-specific field identifying the NVME host port + * to use for the connection to the controller. + * @queue_size: Number of IO queue elements. + * @nr_io_queues: Number of controller IO queues that will be established. + * @reconnect_delay: Time between two consecutive reconnect attempts. + * @discovery_nqn: indicates if the subsysnqn is the well-known discovery NQN. + * @kato: Keep-alive timeout. + * @host: Virtual NVMe host, contains the NQN and Host ID. + * @max_reconnects: maximum number of allowed reconnect attempts before removing + * the controller, (-1) means reconnect forever, zero means remove + * immediately; + */ +struct nvmf_ctrl_options { + unsigned mask; + char *transport; + char *subsysnqn; + char *traddr; + char *trsvcid; + char *host_traddr; + size_t queue_size; + unsigned int nr_io_queues; + unsigned int reconnect_delay; + bool discovery_nqn; + bool duplicate_connect; + unsigned int kato; + struct nvmf_host *host; + int max_reconnects; +}; + +/* + * struct nvmf_transport_ops - used to register a specific + * fabric implementation of NVMe fabrics. + * @entry: Used by the fabrics library to add the new + * registration entry to its linked-list internal tree. + * @module: Transport module reference + * @name: Name of the NVMe fabric driver implementation. + * @required_opts: sysfs command-line options that must be specified + * when adding a new NVMe controller. + * @allowed_opts: sysfs command-line options that can be specified + * when adding a new NVMe controller. + * @create_ctrl(): function pointer that points to a non-NVMe + * implementation-specific fabric technology + * that would go into starting up that fabric + * for the purpose of conneciton to an NVMe controller + * using that fabric technology. + * + * Notes: + * 1. At minimum, 'required_opts' and 'allowed_opts' should + * be set to the same enum parsing options defined earlier. + * 2. create_ctrl() must be defined (even if it does nothing) + * 3. struct nvmf_transport_ops must be statically allocated in the + * modules .bss section so that a pure module_get on @module + * prevents the memory from beeing freed. + */ +struct nvmf_transport_ops { + struct list_head entry; + struct module *module; + const char *name; + int required_opts; + int allowed_opts; + struct nvme_ctrl *(*create_ctrl)(struct device *dev, + struct nvmf_ctrl_options *opts); +}; + +static inline bool +nvmf_ctlr_matches_baseopts(struct nvme_ctrl *ctrl, + struct nvmf_ctrl_options *opts) +{ + if (ctrl->state == NVME_CTRL_DELETING || + ctrl->state == NVME_CTRL_DEAD || + strcmp(opts->subsysnqn, ctrl->opts->subsysnqn) || + strcmp(opts->host->nqn, ctrl->opts->host->nqn) || + memcmp(&opts->host->id, &ctrl->opts->host->id, sizeof(uuid_t))) + return false; + + return true; +} + +int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val); +int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val); +int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val); +int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl); +int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid); +int nvmf_register_transport(struct nvmf_transport_ops *ops); +void nvmf_unregister_transport(struct nvmf_transport_ops *ops); +void nvmf_free_options(struct nvmf_ctrl_options *opts); +int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size); +bool nvmf_should_reconnect(struct nvme_ctrl *ctrl); +blk_status_t nvmf_fail_nonready_command(struct nvme_ctrl *ctrl, + struct request *rq); +bool __nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq, + bool queue_live); + +static inline bool nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq, + bool queue_live) +{ + if (likely(ctrl->state == NVME_CTRL_LIVE || + ctrl->state == NVME_CTRL_ADMIN_ONLY)) + return true; + return __nvmf_check_ready(ctrl, rq, queue_live); +} + +#endif /* _NVME_FABRICS_H */ diff --git a/drivers/nvme/host/fault_inject.c b/drivers/nvme/host/fault_inject.c new file mode 100644 index 000000000..02632266a --- /dev/null +++ b/drivers/nvme/host/fault_inject.c @@ -0,0 +1,79 @@ +/* + * fault injection support for nvme. + * + * Copyright (c) 2018, Oracle and/or its affiliates + * + */ + +#include <linux/moduleparam.h> +#include "nvme.h" + +static DECLARE_FAULT_ATTR(fail_default_attr); +/* optional fault injection attributes boot time option: + * nvme_core.fail_request=<interval>,<probability>,<space>,<times> + */ +static char *fail_request; +module_param(fail_request, charp, 0000); + +void nvme_fault_inject_init(struct nvme_ns *ns) +{ + struct dentry *dir, *parent; + char *name = ns->disk->disk_name; + struct nvme_fault_inject *fault_inj = &ns->fault_inject; + struct fault_attr *attr = &fault_inj->attr; + + /* set default fault injection attribute */ + if (fail_request) + setup_fault_attr(&fail_default_attr, fail_request); + + /* create debugfs directory and attribute */ + parent = debugfs_create_dir(name, NULL); + if (!parent) { + pr_warn("%s: failed to create debugfs directory\n", name); + return; + } + + *attr = fail_default_attr; + dir = fault_create_debugfs_attr("fault_inject", parent, attr); + if (IS_ERR(dir)) { + pr_warn("%s: failed to create debugfs attr\n", name); + debugfs_remove_recursive(parent); + return; + } + ns->fault_inject.parent = parent; + + /* create debugfs for status code and dont_retry */ + fault_inj->status = NVME_SC_INVALID_OPCODE; + fault_inj->dont_retry = true; + debugfs_create_x16("status", 0600, dir, &fault_inj->status); + debugfs_create_bool("dont_retry", 0600, dir, &fault_inj->dont_retry); +} + +void nvme_fault_inject_fini(struct nvme_ns *ns) +{ + /* remove debugfs directories */ + debugfs_remove_recursive(ns->fault_inject.parent); +} + +void nvme_should_fail(struct request *req) +{ + struct gendisk *disk = req->rq_disk; + struct nvme_ns *ns = NULL; + u16 status; + + /* + * make sure this request is coming from a valid namespace + */ + if (!disk) + return; + + ns = disk->private_data; + if (ns && should_fail(&ns->fault_inject.attr, 1)) { + /* inject status code and DNR bit */ + status = ns->fault_inject.status; + if (ns->fault_inject.dont_retry) + status |= NVME_SC_DNR; + nvme_req(req)->status = status; + } +} +EXPORT_SYMBOL_GPL(nvme_should_fail); diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c new file mode 100644 index 000000000..ed88d5021 --- /dev/null +++ b/drivers/nvme/host/fc.c @@ -0,0 +1,3410 @@ +/* + * Copyright (c) 2016 Avago Technologies. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful. + * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, + * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A + * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO + * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID. + * See the GNU General Public License for more details, a copy of which + * can be found in the file COPYING included with this package + * + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/module.h> +#include <linux/parser.h> +#include <uapi/scsi/fc/fc_fs.h> +#include <uapi/scsi/fc/fc_els.h> +#include <linux/delay.h> + +#include "nvme.h" +#include "fabrics.h" +#include <linux/nvme-fc-driver.h> +#include <linux/nvme-fc.h> + + +/* *************************** Data Structures/Defines ****************** */ + + +enum nvme_fc_queue_flags { + NVME_FC_Q_CONNECTED = 0, + NVME_FC_Q_LIVE, +}; + +#define NVME_FC_DEFAULT_DEV_LOSS_TMO 60 /* seconds */ + +struct nvme_fc_queue { + struct nvme_fc_ctrl *ctrl; + struct device *dev; + struct blk_mq_hw_ctx *hctx; + void *lldd_handle; + size_t cmnd_capsule_len; + u32 qnum; + u32 rqcnt; + u32 seqno; + + u64 connection_id; + atomic_t csn; + + unsigned long flags; +} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ + +enum nvme_fcop_flags { + FCOP_FLAGS_TERMIO = (1 << 0), + FCOP_FLAGS_AEN = (1 << 1), +}; + +struct nvmefc_ls_req_op { + struct nvmefc_ls_req ls_req; + + struct nvme_fc_rport *rport; + struct nvme_fc_queue *queue; + struct request *rq; + u32 flags; + + int ls_error; + struct completion ls_done; + struct list_head lsreq_list; /* rport->ls_req_list */ + bool req_queued; +}; + +enum nvme_fcpop_state { + FCPOP_STATE_UNINIT = 0, + FCPOP_STATE_IDLE = 1, + FCPOP_STATE_ACTIVE = 2, + FCPOP_STATE_ABORTED = 3, + FCPOP_STATE_COMPLETE = 4, +}; + +struct nvme_fc_fcp_op { + struct nvme_request nreq; /* + * nvme/host/core.c + * requires this to be + * the 1st element in the + * private structure + * associated with the + * request. + */ + struct nvmefc_fcp_req fcp_req; + + struct nvme_fc_ctrl *ctrl; + struct nvme_fc_queue *queue; + struct request *rq; + + atomic_t state; + u32 flags; + u32 rqno; + u32 nents; + + struct nvme_fc_cmd_iu cmd_iu; + struct nvme_fc_ersp_iu rsp_iu; +}; + +struct nvme_fc_lport { + struct nvme_fc_local_port localport; + + struct ida endp_cnt; + struct list_head port_list; /* nvme_fc_port_list */ + struct list_head endp_list; + struct device *dev; /* physical device for dma */ + struct nvme_fc_port_template *ops; + struct kref ref; + atomic_t act_rport_cnt; +} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ + +struct nvme_fc_rport { + struct nvme_fc_remote_port remoteport; + + struct list_head endp_list; /* for lport->endp_list */ + struct list_head ctrl_list; + struct list_head ls_req_list; + struct device *dev; /* physical device for dma */ + struct nvme_fc_lport *lport; + spinlock_t lock; + struct kref ref; + atomic_t act_ctrl_cnt; + unsigned long dev_loss_end; +} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ + +enum nvme_fcctrl_flags { + FCCTRL_TERMIO = (1 << 0), +}; + +struct nvme_fc_ctrl { + spinlock_t lock; + struct nvme_fc_queue *queues; + struct device *dev; + struct nvme_fc_lport *lport; + struct nvme_fc_rport *rport; + u32 cnum; + + bool ioq_live; + bool assoc_active; + atomic_t err_work_active; + u64 association_id; + + struct list_head ctrl_list; /* rport->ctrl_list */ + + struct blk_mq_tag_set admin_tag_set; + struct blk_mq_tag_set tag_set; + + struct delayed_work connect_work; + struct work_struct err_work; + + struct kref ref; + u32 flags; + u32 iocnt; + wait_queue_head_t ioabort_wait; + + struct nvme_fc_fcp_op aen_ops[NVME_NR_AEN_COMMANDS]; + + struct nvme_ctrl ctrl; +}; + +static inline struct nvme_fc_ctrl * +to_fc_ctrl(struct nvme_ctrl *ctrl) +{ + return container_of(ctrl, struct nvme_fc_ctrl, ctrl); +} + +static inline struct nvme_fc_lport * +localport_to_lport(struct nvme_fc_local_port *portptr) +{ + return container_of(portptr, struct nvme_fc_lport, localport); +} + +static inline struct nvme_fc_rport * +remoteport_to_rport(struct nvme_fc_remote_port *portptr) +{ + return container_of(portptr, struct nvme_fc_rport, remoteport); +} + +static inline struct nvmefc_ls_req_op * +ls_req_to_lsop(struct nvmefc_ls_req *lsreq) +{ + return container_of(lsreq, struct nvmefc_ls_req_op, ls_req); +} + +static inline struct nvme_fc_fcp_op * +fcp_req_to_fcp_op(struct nvmefc_fcp_req *fcpreq) +{ + return container_of(fcpreq, struct nvme_fc_fcp_op, fcp_req); +} + + + +/* *************************** Globals **************************** */ + + +static DEFINE_SPINLOCK(nvme_fc_lock); + +static LIST_HEAD(nvme_fc_lport_list); +static DEFINE_IDA(nvme_fc_local_port_cnt); +static DEFINE_IDA(nvme_fc_ctrl_cnt); + +static struct workqueue_struct *nvme_fc_wq; + +/* + * These items are short-term. They will eventually be moved into + * a generic FC class. See comments in module init. + */ +static struct class *fc_class; +static struct device *fc_udev_device; + + +/* *********************** FC-NVME Port Management ************************ */ + +static void __nvme_fc_delete_hw_queue(struct nvme_fc_ctrl *, + struct nvme_fc_queue *, unsigned int); + +static void +nvme_fc_free_lport(struct kref *ref) +{ + struct nvme_fc_lport *lport = + container_of(ref, struct nvme_fc_lport, ref); + unsigned long flags; + + WARN_ON(lport->localport.port_state != FC_OBJSTATE_DELETED); + WARN_ON(!list_empty(&lport->endp_list)); + + /* remove from transport list */ + spin_lock_irqsave(&nvme_fc_lock, flags); + list_del(&lport->port_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + ida_simple_remove(&nvme_fc_local_port_cnt, lport->localport.port_num); + ida_destroy(&lport->endp_cnt); + + put_device(lport->dev); + + kfree(lport); +} + +static void +nvme_fc_lport_put(struct nvme_fc_lport *lport) +{ + kref_put(&lport->ref, nvme_fc_free_lport); +} + +static int +nvme_fc_lport_get(struct nvme_fc_lport *lport) +{ + return kref_get_unless_zero(&lport->ref); +} + + +static struct nvme_fc_lport * +nvme_fc_attach_to_unreg_lport(struct nvme_fc_port_info *pinfo, + struct nvme_fc_port_template *ops, + struct device *dev) +{ + struct nvme_fc_lport *lport; + unsigned long flags; + + spin_lock_irqsave(&nvme_fc_lock, flags); + + list_for_each_entry(lport, &nvme_fc_lport_list, port_list) { + if (lport->localport.node_name != pinfo->node_name || + lport->localport.port_name != pinfo->port_name) + continue; + + if (lport->dev != dev) { + lport = ERR_PTR(-EXDEV); + goto out_done; + } + + if (lport->localport.port_state != FC_OBJSTATE_DELETED) { + lport = ERR_PTR(-EEXIST); + goto out_done; + } + + if (!nvme_fc_lport_get(lport)) { + /* + * fails if ref cnt already 0. If so, + * act as if lport already deleted + */ + lport = NULL; + goto out_done; + } + + /* resume the lport */ + + lport->ops = ops; + lport->localport.port_role = pinfo->port_role; + lport->localport.port_id = pinfo->port_id; + lport->localport.port_state = FC_OBJSTATE_ONLINE; + + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + return lport; + } + + lport = NULL; + +out_done: + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + return lport; +} + +/** + * nvme_fc_register_localport - transport entry point called by an + * LLDD to register the existence of a NVME + * host FC port. + * @pinfo: pointer to information about the port to be registered + * @template: LLDD entrypoints and operational parameters for the port + * @dev: physical hardware device node port corresponds to. Will be + * used for DMA mappings + * @lport_p: pointer to a local port pointer. Upon success, the routine + * will allocate a nvme_fc_local_port structure and place its + * address in the local port pointer. Upon failure, local port + * pointer will be set to 0. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvme_fc_register_localport(struct nvme_fc_port_info *pinfo, + struct nvme_fc_port_template *template, + struct device *dev, + struct nvme_fc_local_port **portptr) +{ + struct nvme_fc_lport *newrec; + unsigned long flags; + int ret, idx; + + if (!template->localport_delete || !template->remoteport_delete || + !template->ls_req || !template->fcp_io || + !template->ls_abort || !template->fcp_abort || + !template->max_hw_queues || !template->max_sgl_segments || + !template->max_dif_sgl_segments || !template->dma_boundary) { + ret = -EINVAL; + goto out_reghost_failed; + } + + /* + * look to see if there is already a localport that had been + * deregistered and in the process of waiting for all the + * references to fully be removed. If the references haven't + * expired, we can simply re-enable the localport. Remoteports + * and controller reconnections should resume naturally. + */ + newrec = nvme_fc_attach_to_unreg_lport(pinfo, template, dev); + + /* found an lport, but something about its state is bad */ + if (IS_ERR(newrec)) { + ret = PTR_ERR(newrec); + goto out_reghost_failed; + + /* found existing lport, which was resumed */ + } else if (newrec) { + *portptr = &newrec->localport; + return 0; + } + + /* nothing found - allocate a new localport struct */ + + newrec = kmalloc((sizeof(*newrec) + template->local_priv_sz), + GFP_KERNEL); + if (!newrec) { + ret = -ENOMEM; + goto out_reghost_failed; + } + + idx = ida_simple_get(&nvme_fc_local_port_cnt, 0, 0, GFP_KERNEL); + if (idx < 0) { + ret = -ENOSPC; + goto out_fail_kfree; + } + + if (!get_device(dev) && dev) { + ret = -ENODEV; + goto out_ida_put; + } + + INIT_LIST_HEAD(&newrec->port_list); + INIT_LIST_HEAD(&newrec->endp_list); + kref_init(&newrec->ref); + atomic_set(&newrec->act_rport_cnt, 0); + newrec->ops = template; + newrec->dev = dev; + ida_init(&newrec->endp_cnt); + newrec->localport.private = &newrec[1]; + newrec->localport.node_name = pinfo->node_name; + newrec->localport.port_name = pinfo->port_name; + newrec->localport.port_role = pinfo->port_role; + newrec->localport.port_id = pinfo->port_id; + newrec->localport.port_state = FC_OBJSTATE_ONLINE; + newrec->localport.port_num = idx; + + spin_lock_irqsave(&nvme_fc_lock, flags); + list_add_tail(&newrec->port_list, &nvme_fc_lport_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + if (dev) + dma_set_seg_boundary(dev, template->dma_boundary); + + *portptr = &newrec->localport; + return 0; + +out_ida_put: + ida_simple_remove(&nvme_fc_local_port_cnt, idx); +out_fail_kfree: + kfree(newrec); +out_reghost_failed: + *portptr = NULL; + + return ret; +} +EXPORT_SYMBOL_GPL(nvme_fc_register_localport); + +/** + * nvme_fc_unregister_localport - transport entry point called by an + * LLDD to deregister/remove a previously + * registered a NVME host FC port. + * @localport: pointer to the (registered) local port that is to be + * deregistered. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvme_fc_unregister_localport(struct nvme_fc_local_port *portptr) +{ + struct nvme_fc_lport *lport = localport_to_lport(portptr); + unsigned long flags; + + if (!portptr) + return -EINVAL; + + spin_lock_irqsave(&nvme_fc_lock, flags); + + if (portptr->port_state != FC_OBJSTATE_ONLINE) { + spin_unlock_irqrestore(&nvme_fc_lock, flags); + return -EINVAL; + } + portptr->port_state = FC_OBJSTATE_DELETED; + + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + if (atomic_read(&lport->act_rport_cnt) == 0) + lport->ops->localport_delete(&lport->localport); + + nvme_fc_lport_put(lport); + + return 0; +} +EXPORT_SYMBOL_GPL(nvme_fc_unregister_localport); + +/* + * TRADDR strings, per FC-NVME are fixed format: + * "nn-0x<16hexdigits>:pn-0x<16hexdigits>" - 43 characters + * udev event will only differ by prefix of what field is + * being specified: + * "NVMEFC_HOST_TRADDR=" or "NVMEFC_TRADDR=" - 19 max characters + * 19 + 43 + null_fudge = 64 characters + */ +#define FCNVME_TRADDR_LENGTH 64 + +static void +nvme_fc_signal_discovery_scan(struct nvme_fc_lport *lport, + struct nvme_fc_rport *rport) +{ + char hostaddr[FCNVME_TRADDR_LENGTH]; /* NVMEFC_HOST_TRADDR=...*/ + char tgtaddr[FCNVME_TRADDR_LENGTH]; /* NVMEFC_TRADDR=...*/ + char *envp[4] = { "FC_EVENT=nvmediscovery", hostaddr, tgtaddr, NULL }; + + if (!(rport->remoteport.port_role & FC_PORT_ROLE_NVME_DISCOVERY)) + return; + + snprintf(hostaddr, sizeof(hostaddr), + "NVMEFC_HOST_TRADDR=nn-0x%016llx:pn-0x%016llx", + lport->localport.node_name, lport->localport.port_name); + snprintf(tgtaddr, sizeof(tgtaddr), + "NVMEFC_TRADDR=nn-0x%016llx:pn-0x%016llx", + rport->remoteport.node_name, rport->remoteport.port_name); + kobject_uevent_env(&fc_udev_device->kobj, KOBJ_CHANGE, envp); +} + +static void +nvme_fc_free_rport(struct kref *ref) +{ + struct nvme_fc_rport *rport = + container_of(ref, struct nvme_fc_rport, ref); + struct nvme_fc_lport *lport = + localport_to_lport(rport->remoteport.localport); + unsigned long flags; + + WARN_ON(rport->remoteport.port_state != FC_OBJSTATE_DELETED); + WARN_ON(!list_empty(&rport->ctrl_list)); + + /* remove from lport list */ + spin_lock_irqsave(&nvme_fc_lock, flags); + list_del(&rport->endp_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + ida_simple_remove(&lport->endp_cnt, rport->remoteport.port_num); + + kfree(rport); + + nvme_fc_lport_put(lport); +} + +static void +nvme_fc_rport_put(struct nvme_fc_rport *rport) +{ + kref_put(&rport->ref, nvme_fc_free_rport); +} + +static int +nvme_fc_rport_get(struct nvme_fc_rport *rport) +{ + return kref_get_unless_zero(&rport->ref); +} + +static void +nvme_fc_resume_controller(struct nvme_fc_ctrl *ctrl) +{ + switch (ctrl->ctrl.state) { + case NVME_CTRL_NEW: + case NVME_CTRL_CONNECTING: + /* + * As all reconnects were suppressed, schedule a + * connect. + */ + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: connectivity re-established. " + "Attempting reconnect\n", ctrl->cnum); + + queue_delayed_work(nvme_wq, &ctrl->connect_work, 0); + break; + + case NVME_CTRL_RESETTING: + /* + * Controller is already in the process of terminating the + * association. No need to do anything further. The reconnect + * step will naturally occur after the reset completes. + */ + break; + + default: + /* no action to take - let it delete */ + break; + } +} + +static struct nvme_fc_rport * +nvme_fc_attach_to_suspended_rport(struct nvme_fc_lport *lport, + struct nvme_fc_port_info *pinfo) +{ + struct nvme_fc_rport *rport; + struct nvme_fc_ctrl *ctrl; + unsigned long flags; + + spin_lock_irqsave(&nvme_fc_lock, flags); + + list_for_each_entry(rport, &lport->endp_list, endp_list) { + if (rport->remoteport.node_name != pinfo->node_name || + rport->remoteport.port_name != pinfo->port_name) + continue; + + if (!nvme_fc_rport_get(rport)) { + rport = ERR_PTR(-ENOLCK); + goto out_done; + } + + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + spin_lock_irqsave(&rport->lock, flags); + + /* has it been unregistered */ + if (rport->remoteport.port_state != FC_OBJSTATE_DELETED) { + /* means lldd called us twice */ + spin_unlock_irqrestore(&rport->lock, flags); + nvme_fc_rport_put(rport); + return ERR_PTR(-ESTALE); + } + + rport->remoteport.port_role = pinfo->port_role; + rport->remoteport.port_id = pinfo->port_id; + rport->remoteport.port_state = FC_OBJSTATE_ONLINE; + rport->dev_loss_end = 0; + + /* + * kick off a reconnect attempt on all associations to the + * remote port. A successful reconnects will resume i/o. + */ + list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) + nvme_fc_resume_controller(ctrl); + + spin_unlock_irqrestore(&rport->lock, flags); + + return rport; + } + + rport = NULL; + +out_done: + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + return rport; +} + +static inline void +__nvme_fc_set_dev_loss_tmo(struct nvme_fc_rport *rport, + struct nvme_fc_port_info *pinfo) +{ + if (pinfo->dev_loss_tmo) + rport->remoteport.dev_loss_tmo = pinfo->dev_loss_tmo; + else + rport->remoteport.dev_loss_tmo = NVME_FC_DEFAULT_DEV_LOSS_TMO; +} + +/** + * nvme_fc_register_remoteport - transport entry point called by an + * LLDD to register the existence of a NVME + * subsystem FC port on its fabric. + * @localport: pointer to the (registered) local port that the remote + * subsystem port is connected to. + * @pinfo: pointer to information about the port to be registered + * @rport_p: pointer to a remote port pointer. Upon success, the routine + * will allocate a nvme_fc_remote_port structure and place its + * address in the remote port pointer. Upon failure, remote port + * pointer will be set to 0. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvme_fc_register_remoteport(struct nvme_fc_local_port *localport, + struct nvme_fc_port_info *pinfo, + struct nvme_fc_remote_port **portptr) +{ + struct nvme_fc_lport *lport = localport_to_lport(localport); + struct nvme_fc_rport *newrec; + unsigned long flags; + int ret, idx; + + if (!nvme_fc_lport_get(lport)) { + ret = -ESHUTDOWN; + goto out_reghost_failed; + } + + /* + * look to see if there is already a remoteport that is waiting + * for a reconnect (within dev_loss_tmo) with the same WWN's. + * If so, transition to it and reconnect. + */ + newrec = nvme_fc_attach_to_suspended_rport(lport, pinfo); + + /* found an rport, but something about its state is bad */ + if (IS_ERR(newrec)) { + ret = PTR_ERR(newrec); + goto out_lport_put; + + /* found existing rport, which was resumed */ + } else if (newrec) { + nvme_fc_lport_put(lport); + __nvme_fc_set_dev_loss_tmo(newrec, pinfo); + nvme_fc_signal_discovery_scan(lport, newrec); + *portptr = &newrec->remoteport; + return 0; + } + + /* nothing found - allocate a new remoteport struct */ + + newrec = kmalloc((sizeof(*newrec) + lport->ops->remote_priv_sz), + GFP_KERNEL); + if (!newrec) { + ret = -ENOMEM; + goto out_lport_put; + } + + idx = ida_simple_get(&lport->endp_cnt, 0, 0, GFP_KERNEL); + if (idx < 0) { + ret = -ENOSPC; + goto out_kfree_rport; + } + + INIT_LIST_HEAD(&newrec->endp_list); + INIT_LIST_HEAD(&newrec->ctrl_list); + INIT_LIST_HEAD(&newrec->ls_req_list); + kref_init(&newrec->ref); + atomic_set(&newrec->act_ctrl_cnt, 0); + spin_lock_init(&newrec->lock); + newrec->remoteport.localport = &lport->localport; + newrec->dev = lport->dev; + newrec->lport = lport; + newrec->remoteport.private = &newrec[1]; + newrec->remoteport.port_role = pinfo->port_role; + newrec->remoteport.node_name = pinfo->node_name; + newrec->remoteport.port_name = pinfo->port_name; + newrec->remoteport.port_id = pinfo->port_id; + newrec->remoteport.port_state = FC_OBJSTATE_ONLINE; + newrec->remoteport.port_num = idx; + __nvme_fc_set_dev_loss_tmo(newrec, pinfo); + + spin_lock_irqsave(&nvme_fc_lock, flags); + list_add_tail(&newrec->endp_list, &lport->endp_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + nvme_fc_signal_discovery_scan(lport, newrec); + + *portptr = &newrec->remoteport; + return 0; + +out_kfree_rport: + kfree(newrec); +out_lport_put: + nvme_fc_lport_put(lport); +out_reghost_failed: + *portptr = NULL; + return ret; +} +EXPORT_SYMBOL_GPL(nvme_fc_register_remoteport); + +static int +nvme_fc_abort_lsops(struct nvme_fc_rport *rport) +{ + struct nvmefc_ls_req_op *lsop; + unsigned long flags; + +restart: + spin_lock_irqsave(&rport->lock, flags); + + list_for_each_entry(lsop, &rport->ls_req_list, lsreq_list) { + if (!(lsop->flags & FCOP_FLAGS_TERMIO)) { + lsop->flags |= FCOP_FLAGS_TERMIO; + spin_unlock_irqrestore(&rport->lock, flags); + rport->lport->ops->ls_abort(&rport->lport->localport, + &rport->remoteport, + &lsop->ls_req); + goto restart; + } + } + spin_unlock_irqrestore(&rport->lock, flags); + + return 0; +} + +static void +nvme_fc_ctrl_connectivity_loss(struct nvme_fc_ctrl *ctrl) +{ + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: controller connectivity lost. Awaiting " + "Reconnect", ctrl->cnum); + + switch (ctrl->ctrl.state) { + case NVME_CTRL_NEW: + case NVME_CTRL_LIVE: + /* + * Schedule a controller reset. The reset will terminate the + * association and schedule the reconnect timer. Reconnects + * will be attempted until either the ctlr_loss_tmo + * (max_retries * connect_delay) expires or the remoteport's + * dev_loss_tmo expires. + */ + if (nvme_reset_ctrl(&ctrl->ctrl)) { + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: Couldn't schedule reset.\n", + ctrl->cnum); + nvme_delete_ctrl(&ctrl->ctrl); + } + break; + + case NVME_CTRL_CONNECTING: + /* + * The association has already been terminated and the + * controller is attempting reconnects. No need to do anything + * futher. Reconnects will be attempted until either the + * ctlr_loss_tmo (max_retries * connect_delay) expires or the + * remoteport's dev_loss_tmo expires. + */ + break; + + case NVME_CTRL_RESETTING: + /* + * Controller is already in the process of terminating the + * association. No need to do anything further. The reconnect + * step will kick in naturally after the association is + * terminated. + */ + break; + + case NVME_CTRL_DELETING: + default: + /* no action to take - let it delete */ + break; + } +} + +/** + * nvme_fc_unregister_remoteport - transport entry point called by an + * LLDD to deregister/remove a previously + * registered a NVME subsystem FC port. + * @remoteport: pointer to the (registered) remote port that is to be + * deregistered. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *portptr) +{ + struct nvme_fc_rport *rport = remoteport_to_rport(portptr); + struct nvme_fc_ctrl *ctrl; + unsigned long flags; + + if (!portptr) + return -EINVAL; + + spin_lock_irqsave(&rport->lock, flags); + + if (portptr->port_state != FC_OBJSTATE_ONLINE) { + spin_unlock_irqrestore(&rport->lock, flags); + return -EINVAL; + } + portptr->port_state = FC_OBJSTATE_DELETED; + + rport->dev_loss_end = jiffies + (portptr->dev_loss_tmo * HZ); + + list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) { + /* if dev_loss_tmo==0, dev loss is immediate */ + if (!portptr->dev_loss_tmo) { + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: controller connectivity lost.\n", + ctrl->cnum); + nvme_delete_ctrl(&ctrl->ctrl); + } else + nvme_fc_ctrl_connectivity_loss(ctrl); + } + + spin_unlock_irqrestore(&rport->lock, flags); + + nvme_fc_abort_lsops(rport); + + if (atomic_read(&rport->act_ctrl_cnt) == 0) + rport->lport->ops->remoteport_delete(portptr); + + /* + * release the reference, which will allow, if all controllers + * go away, which should only occur after dev_loss_tmo occurs, + * for the rport to be torn down. + */ + nvme_fc_rport_put(rport); + + return 0; +} +EXPORT_SYMBOL_GPL(nvme_fc_unregister_remoteport); + +/** + * nvme_fc_rescan_remoteport - transport entry point called by an + * LLDD to request a nvme device rescan. + * @remoteport: pointer to the (registered) remote port that is to be + * rescanned. + * + * Returns: N/A + */ +void +nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport) +{ + struct nvme_fc_rport *rport = remoteport_to_rport(remoteport); + + nvme_fc_signal_discovery_scan(rport->lport, rport); +} +EXPORT_SYMBOL_GPL(nvme_fc_rescan_remoteport); + +int +nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *portptr, + u32 dev_loss_tmo) +{ + struct nvme_fc_rport *rport = remoteport_to_rport(portptr); + unsigned long flags; + + spin_lock_irqsave(&rport->lock, flags); + + if (portptr->port_state != FC_OBJSTATE_ONLINE) { + spin_unlock_irqrestore(&rport->lock, flags); + return -EINVAL; + } + + /* a dev_loss_tmo of 0 (immediate) is allowed to be set */ + rport->remoteport.dev_loss_tmo = dev_loss_tmo; + + spin_unlock_irqrestore(&rport->lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(nvme_fc_set_remoteport_devloss); + + +/* *********************** FC-NVME DMA Handling **************************** */ + +/* + * The fcloop device passes in a NULL device pointer. Real LLD's will + * pass in a valid device pointer. If NULL is passed to the dma mapping + * routines, depending on the platform, it may or may not succeed, and + * may crash. + * + * As such: + * Wrapper all the dma routines and check the dev pointer. + * + * If simple mappings (return just a dma address, we'll noop them, + * returning a dma address of 0. + * + * On more complex mappings (dma_map_sg), a pseudo routine fills + * in the scatter list, setting all dma addresses to 0. + */ + +static inline dma_addr_t +fc_dma_map_single(struct device *dev, void *ptr, size_t size, + enum dma_data_direction dir) +{ + return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L; +} + +static inline int +fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return dev ? dma_mapping_error(dev, dma_addr) : 0; +} + +static inline void +fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir) +{ + if (dev) + dma_unmap_single(dev, addr, size, dir); +} + +static inline void +fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir) +{ + if (dev) + dma_sync_single_for_cpu(dev, addr, size, dir); +} + +static inline void +fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir) +{ + if (dev) + dma_sync_single_for_device(dev, addr, size, dir); +} + +/* pseudo dma_map_sg call */ +static int +fc_map_sg(struct scatterlist *sg, int nents) +{ + struct scatterlist *s; + int i; + + WARN_ON(nents == 0 || sg[0].length == 0); + + for_each_sg(sg, s, nents, i) { + s->dma_address = 0L; +#ifdef CONFIG_NEED_SG_DMA_LENGTH + s->dma_length = s->length; +#endif + } + return nents; +} + +static inline int +fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction dir) +{ + return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents); +} + +static inline void +fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction dir) +{ + if (dev) + dma_unmap_sg(dev, sg, nents, dir); +} + +/* *********************** FC-NVME LS Handling **************************** */ + +static void nvme_fc_ctrl_put(struct nvme_fc_ctrl *); +static int nvme_fc_ctrl_get(struct nvme_fc_ctrl *); + + +static void +__nvme_fc_finish_ls_req(struct nvmefc_ls_req_op *lsop) +{ + struct nvme_fc_rport *rport = lsop->rport; + struct nvmefc_ls_req *lsreq = &lsop->ls_req; + unsigned long flags; + + spin_lock_irqsave(&rport->lock, flags); + + if (!lsop->req_queued) { + spin_unlock_irqrestore(&rport->lock, flags); + return; + } + + list_del(&lsop->lsreq_list); + + lsop->req_queued = false; + + spin_unlock_irqrestore(&rport->lock, flags); + + fc_dma_unmap_single(rport->dev, lsreq->rqstdma, + (lsreq->rqstlen + lsreq->rsplen), + DMA_BIDIRECTIONAL); + + nvme_fc_rport_put(rport); +} + +static int +__nvme_fc_send_ls_req(struct nvme_fc_rport *rport, + struct nvmefc_ls_req_op *lsop, + void (*done)(struct nvmefc_ls_req *req, int status)) +{ + struct nvmefc_ls_req *lsreq = &lsop->ls_req; + unsigned long flags; + int ret = 0; + + if (rport->remoteport.port_state != FC_OBJSTATE_ONLINE) + return -ECONNREFUSED; + + if (!nvme_fc_rport_get(rport)) + return -ESHUTDOWN; + + lsreq->done = done; + lsop->rport = rport; + lsop->req_queued = false; + INIT_LIST_HEAD(&lsop->lsreq_list); + init_completion(&lsop->ls_done); + + lsreq->rqstdma = fc_dma_map_single(rport->dev, lsreq->rqstaddr, + lsreq->rqstlen + lsreq->rsplen, + DMA_BIDIRECTIONAL); + if (fc_dma_mapping_error(rport->dev, lsreq->rqstdma)) { + ret = -EFAULT; + goto out_putrport; + } + lsreq->rspdma = lsreq->rqstdma + lsreq->rqstlen; + + spin_lock_irqsave(&rport->lock, flags); + + list_add_tail(&lsop->lsreq_list, &rport->ls_req_list); + + lsop->req_queued = true; + + spin_unlock_irqrestore(&rport->lock, flags); + + ret = rport->lport->ops->ls_req(&rport->lport->localport, + &rport->remoteport, lsreq); + if (ret) + goto out_unlink; + + return 0; + +out_unlink: + lsop->ls_error = ret; + spin_lock_irqsave(&rport->lock, flags); + lsop->req_queued = false; + list_del(&lsop->lsreq_list); + spin_unlock_irqrestore(&rport->lock, flags); + fc_dma_unmap_single(rport->dev, lsreq->rqstdma, + (lsreq->rqstlen + lsreq->rsplen), + DMA_BIDIRECTIONAL); +out_putrport: + nvme_fc_rport_put(rport); + + return ret; +} + +static void +nvme_fc_send_ls_req_done(struct nvmefc_ls_req *lsreq, int status) +{ + struct nvmefc_ls_req_op *lsop = ls_req_to_lsop(lsreq); + + lsop->ls_error = status; + complete(&lsop->ls_done); +} + +static int +nvme_fc_send_ls_req(struct nvme_fc_rport *rport, struct nvmefc_ls_req_op *lsop) +{ + struct nvmefc_ls_req *lsreq = &lsop->ls_req; + struct fcnvme_ls_rjt *rjt = lsreq->rspaddr; + int ret; + + ret = __nvme_fc_send_ls_req(rport, lsop, nvme_fc_send_ls_req_done); + + if (!ret) { + /* + * No timeout/not interruptible as we need the struct + * to exist until the lldd calls us back. Thus mandate + * wait until driver calls back. lldd responsible for + * the timeout action + */ + wait_for_completion(&lsop->ls_done); + + __nvme_fc_finish_ls_req(lsop); + + ret = lsop->ls_error; + } + + if (ret) + return ret; + + /* ACC or RJT payload ? */ + if (rjt->w0.ls_cmd == FCNVME_LS_RJT) + return -ENXIO; + + return 0; +} + +static int +nvme_fc_send_ls_req_async(struct nvme_fc_rport *rport, + struct nvmefc_ls_req_op *lsop, + void (*done)(struct nvmefc_ls_req *req, int status)) +{ + /* don't wait for completion */ + + return __nvme_fc_send_ls_req(rport, lsop, done); +} + +/* Validation Error indexes into the string table below */ +enum { + VERR_NO_ERROR = 0, + VERR_LSACC = 1, + VERR_LSDESC_RQST = 2, + VERR_LSDESC_RQST_LEN = 3, + VERR_ASSOC_ID = 4, + VERR_ASSOC_ID_LEN = 5, + VERR_CONN_ID = 6, + VERR_CONN_ID_LEN = 7, + VERR_CR_ASSOC = 8, + VERR_CR_ASSOC_ACC_LEN = 9, + VERR_CR_CONN = 10, + VERR_CR_CONN_ACC_LEN = 11, + VERR_DISCONN = 12, + VERR_DISCONN_ACC_LEN = 13, +}; + +static char *validation_errors[] = { + "OK", + "Not LS_ACC", + "Not LSDESC_RQST", + "Bad LSDESC_RQST Length", + "Not Association ID", + "Bad Association ID Length", + "Not Connection ID", + "Bad Connection ID Length", + "Not CR_ASSOC Rqst", + "Bad CR_ASSOC ACC Length", + "Not CR_CONN Rqst", + "Bad CR_CONN ACC Length", + "Not Disconnect Rqst", + "Bad Disconnect ACC Length", +}; + +static int +nvme_fc_connect_admin_queue(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_queue *queue, u16 qsize, u16 ersp_ratio) +{ + struct nvmefc_ls_req_op *lsop; + struct nvmefc_ls_req *lsreq; + struct fcnvme_ls_cr_assoc_rqst *assoc_rqst; + struct fcnvme_ls_cr_assoc_acc *assoc_acc; + int ret, fcret = 0; + + lsop = kzalloc((sizeof(*lsop) + + ctrl->lport->ops->lsrqst_priv_sz + + sizeof(*assoc_rqst) + sizeof(*assoc_acc)), GFP_KERNEL); + if (!lsop) { + ret = -ENOMEM; + goto out_no_memory; + } + lsreq = &lsop->ls_req; + + lsreq->private = (void *)&lsop[1]; + assoc_rqst = (struct fcnvme_ls_cr_assoc_rqst *) + (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); + assoc_acc = (struct fcnvme_ls_cr_assoc_acc *)&assoc_rqst[1]; + + assoc_rqst->w0.ls_cmd = FCNVME_LS_CREATE_ASSOCIATION; + assoc_rqst->desc_list_len = + cpu_to_be32(sizeof(struct fcnvme_lsdesc_cr_assoc_cmd)); + + assoc_rqst->assoc_cmd.desc_tag = + cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD); + assoc_rqst->assoc_cmd.desc_len = + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_cr_assoc_cmd)); + + assoc_rqst->assoc_cmd.ersp_ratio = cpu_to_be16(ersp_ratio); + assoc_rqst->assoc_cmd.sqsize = cpu_to_be16(qsize - 1); + /* Linux supports only Dynamic controllers */ + assoc_rqst->assoc_cmd.cntlid = cpu_to_be16(0xffff); + uuid_copy(&assoc_rqst->assoc_cmd.hostid, &ctrl->ctrl.opts->host->id); + strncpy(assoc_rqst->assoc_cmd.hostnqn, ctrl->ctrl.opts->host->nqn, + min(FCNVME_ASSOC_HOSTNQN_LEN, NVMF_NQN_SIZE)); + strncpy(assoc_rqst->assoc_cmd.subnqn, ctrl->ctrl.opts->subsysnqn, + min(FCNVME_ASSOC_SUBNQN_LEN, NVMF_NQN_SIZE)); + + lsop->queue = queue; + lsreq->rqstaddr = assoc_rqst; + lsreq->rqstlen = sizeof(*assoc_rqst); + lsreq->rspaddr = assoc_acc; + lsreq->rsplen = sizeof(*assoc_acc); + lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; + + ret = nvme_fc_send_ls_req(ctrl->rport, lsop); + if (ret) + goto out_free_buffer; + + /* process connect LS completion */ + + /* validate the ACC response */ + if (assoc_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC) + fcret = VERR_LSACC; + else if (assoc_acc->hdr.desc_list_len != + fcnvme_lsdesc_len( + sizeof(struct fcnvme_ls_cr_assoc_acc))) + fcret = VERR_CR_ASSOC_ACC_LEN; + else if (assoc_acc->hdr.rqst.desc_tag != + cpu_to_be32(FCNVME_LSDESC_RQST)) + fcret = VERR_LSDESC_RQST; + else if (assoc_acc->hdr.rqst.desc_len != + fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst))) + fcret = VERR_LSDESC_RQST_LEN; + else if (assoc_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_CREATE_ASSOCIATION) + fcret = VERR_CR_ASSOC; + else if (assoc_acc->associd.desc_tag != + cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) + fcret = VERR_ASSOC_ID; + else if (assoc_acc->associd.desc_len != + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_assoc_id))) + fcret = VERR_ASSOC_ID_LEN; + else if (assoc_acc->connectid.desc_tag != + cpu_to_be32(FCNVME_LSDESC_CONN_ID)) + fcret = VERR_CONN_ID; + else if (assoc_acc->connectid.desc_len != + fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_conn_id))) + fcret = VERR_CONN_ID_LEN; + + if (fcret) { + ret = -EBADF; + dev_err(ctrl->dev, + "q %d connect failed: %s\n", + queue->qnum, validation_errors[fcret]); + } else { + ctrl->association_id = + be64_to_cpu(assoc_acc->associd.association_id); + queue->connection_id = + be64_to_cpu(assoc_acc->connectid.connection_id); + set_bit(NVME_FC_Q_CONNECTED, &queue->flags); + } + +out_free_buffer: + kfree(lsop); +out_no_memory: + if (ret) + dev_err(ctrl->dev, + "queue %d connect admin queue failed (%d).\n", + queue->qnum, ret); + return ret; +} + +static int +nvme_fc_connect_queue(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, + u16 qsize, u16 ersp_ratio) +{ + struct nvmefc_ls_req_op *lsop; + struct nvmefc_ls_req *lsreq; + struct fcnvme_ls_cr_conn_rqst *conn_rqst; + struct fcnvme_ls_cr_conn_acc *conn_acc; + int ret, fcret = 0; + + lsop = kzalloc((sizeof(*lsop) + + ctrl->lport->ops->lsrqst_priv_sz + + sizeof(*conn_rqst) + sizeof(*conn_acc)), GFP_KERNEL); + if (!lsop) { + ret = -ENOMEM; + goto out_no_memory; + } + lsreq = &lsop->ls_req; + + lsreq->private = (void *)&lsop[1]; + conn_rqst = (struct fcnvme_ls_cr_conn_rqst *) + (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); + conn_acc = (struct fcnvme_ls_cr_conn_acc *)&conn_rqst[1]; + + conn_rqst->w0.ls_cmd = FCNVME_LS_CREATE_CONNECTION; + conn_rqst->desc_list_len = cpu_to_be32( + sizeof(struct fcnvme_lsdesc_assoc_id) + + sizeof(struct fcnvme_lsdesc_cr_conn_cmd)); + + conn_rqst->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); + conn_rqst->associd.desc_len = + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_assoc_id)); + conn_rqst->associd.association_id = cpu_to_be64(ctrl->association_id); + conn_rqst->connect_cmd.desc_tag = + cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD); + conn_rqst->connect_cmd.desc_len = + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_cr_conn_cmd)); + conn_rqst->connect_cmd.ersp_ratio = cpu_to_be16(ersp_ratio); + conn_rqst->connect_cmd.qid = cpu_to_be16(queue->qnum); + conn_rqst->connect_cmd.sqsize = cpu_to_be16(qsize - 1); + + lsop->queue = queue; + lsreq->rqstaddr = conn_rqst; + lsreq->rqstlen = sizeof(*conn_rqst); + lsreq->rspaddr = conn_acc; + lsreq->rsplen = sizeof(*conn_acc); + lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; + + ret = nvme_fc_send_ls_req(ctrl->rport, lsop); + if (ret) + goto out_free_buffer; + + /* process connect LS completion */ + + /* validate the ACC response */ + if (conn_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC) + fcret = VERR_LSACC; + else if (conn_acc->hdr.desc_list_len != + fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc))) + fcret = VERR_CR_CONN_ACC_LEN; + else if (conn_acc->hdr.rqst.desc_tag != cpu_to_be32(FCNVME_LSDESC_RQST)) + fcret = VERR_LSDESC_RQST; + else if (conn_acc->hdr.rqst.desc_len != + fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst))) + fcret = VERR_LSDESC_RQST_LEN; + else if (conn_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_CREATE_CONNECTION) + fcret = VERR_CR_CONN; + else if (conn_acc->connectid.desc_tag != + cpu_to_be32(FCNVME_LSDESC_CONN_ID)) + fcret = VERR_CONN_ID; + else if (conn_acc->connectid.desc_len != + fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_conn_id))) + fcret = VERR_CONN_ID_LEN; + + if (fcret) { + ret = -EBADF; + dev_err(ctrl->dev, + "q %d connect failed: %s\n", + queue->qnum, validation_errors[fcret]); + } else { + queue->connection_id = + be64_to_cpu(conn_acc->connectid.connection_id); + set_bit(NVME_FC_Q_CONNECTED, &queue->flags); + } + +out_free_buffer: + kfree(lsop); +out_no_memory: + if (ret) + dev_err(ctrl->dev, + "queue %d connect command failed (%d).\n", + queue->qnum, ret); + return ret; +} + +static void +nvme_fc_disconnect_assoc_done(struct nvmefc_ls_req *lsreq, int status) +{ + struct nvmefc_ls_req_op *lsop = ls_req_to_lsop(lsreq); + + __nvme_fc_finish_ls_req(lsop); + + /* fc-nvme iniator doesn't care about success or failure of cmd */ + + kfree(lsop); +} + +/* + * This routine sends a FC-NVME LS to disconnect (aka terminate) + * the FC-NVME Association. Terminating the association also + * terminates the FC-NVME connections (per queue, both admin and io + * queues) that are part of the association. E.g. things are torn + * down, and the related FC-NVME Association ID and Connection IDs + * become invalid. + * + * The behavior of the fc-nvme initiator is such that it's + * understanding of the association and connections will implicitly + * be torn down. The action is implicit as it may be due to a loss of + * connectivity with the fc-nvme target, so you may never get a + * response even if you tried. As such, the action of this routine + * is to asynchronously send the LS, ignore any results of the LS, and + * continue on with terminating the association. If the fc-nvme target + * is present and receives the LS, it too can tear down. + */ +static void +nvme_fc_xmt_disconnect_assoc(struct nvme_fc_ctrl *ctrl) +{ + struct fcnvme_ls_disconnect_rqst *discon_rqst; + struct fcnvme_ls_disconnect_acc *discon_acc; + struct nvmefc_ls_req_op *lsop; + struct nvmefc_ls_req *lsreq; + int ret; + + lsop = kzalloc((sizeof(*lsop) + + ctrl->lport->ops->lsrqst_priv_sz + + sizeof(*discon_rqst) + sizeof(*discon_acc)), + GFP_KERNEL); + if (!lsop) + /* couldn't sent it... too bad */ + return; + + lsreq = &lsop->ls_req; + + lsreq->private = (void *)&lsop[1]; + discon_rqst = (struct fcnvme_ls_disconnect_rqst *) + (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); + discon_acc = (struct fcnvme_ls_disconnect_acc *)&discon_rqst[1]; + + discon_rqst->w0.ls_cmd = FCNVME_LS_DISCONNECT; + discon_rqst->desc_list_len = cpu_to_be32( + sizeof(struct fcnvme_lsdesc_assoc_id) + + sizeof(struct fcnvme_lsdesc_disconn_cmd)); + + discon_rqst->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); + discon_rqst->associd.desc_len = + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_assoc_id)); + + discon_rqst->associd.association_id = cpu_to_be64(ctrl->association_id); + + discon_rqst->discon_cmd.desc_tag = cpu_to_be32( + FCNVME_LSDESC_DISCONN_CMD); + discon_rqst->discon_cmd.desc_len = + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_disconn_cmd)); + discon_rqst->discon_cmd.scope = FCNVME_DISCONN_ASSOCIATION; + discon_rqst->discon_cmd.id = cpu_to_be64(ctrl->association_id); + + lsreq->rqstaddr = discon_rqst; + lsreq->rqstlen = sizeof(*discon_rqst); + lsreq->rspaddr = discon_acc; + lsreq->rsplen = sizeof(*discon_acc); + lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; + + ret = nvme_fc_send_ls_req_async(ctrl->rport, lsop, + nvme_fc_disconnect_assoc_done); + if (ret) + kfree(lsop); + + /* only meaningful part to terminating the association */ + ctrl->association_id = 0; +} + + +/* *********************** NVME Ctrl Routines **************************** */ + +static void nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg); + +static void +__nvme_fc_exit_request(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_fcp_op *op) +{ + fc_dma_unmap_single(ctrl->lport->dev, op->fcp_req.rspdma, + sizeof(op->rsp_iu), DMA_FROM_DEVICE); + fc_dma_unmap_single(ctrl->lport->dev, op->fcp_req.cmddma, + sizeof(op->cmd_iu), DMA_TO_DEVICE); + + atomic_set(&op->state, FCPOP_STATE_UNINIT); +} + +static void +nvme_fc_exit_request(struct blk_mq_tag_set *set, struct request *rq, + unsigned int hctx_idx) +{ + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + + return __nvme_fc_exit_request(set->driver_data, op); +} + +static int +__nvme_fc_abort_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_fcp_op *op) +{ + unsigned long flags; + int opstate; + + spin_lock_irqsave(&ctrl->lock, flags); + opstate = atomic_xchg(&op->state, FCPOP_STATE_ABORTED); + if (opstate != FCPOP_STATE_ACTIVE) + atomic_set(&op->state, opstate); + else if (ctrl->flags & FCCTRL_TERMIO) + ctrl->iocnt++; + spin_unlock_irqrestore(&ctrl->lock, flags); + + if (opstate != FCPOP_STATE_ACTIVE) + return -ECANCELED; + + ctrl->lport->ops->fcp_abort(&ctrl->lport->localport, + &ctrl->rport->remoteport, + op->queue->lldd_handle, + &op->fcp_req); + + return 0; +} + +static void +nvme_fc_abort_aen_ops(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_fcp_op *aen_op = ctrl->aen_ops; + int i; + + /* ensure we've initialized the ops once */ + if (!(aen_op->flags & FCOP_FLAGS_AEN)) + return; + + for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) + __nvme_fc_abort_op(ctrl, aen_op); +} + +static inline void +__nvme_fc_fcpop_chk_teardowns(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_fcp_op *op, int opstate) +{ + unsigned long flags; + + if (opstate == FCPOP_STATE_ABORTED) { + spin_lock_irqsave(&ctrl->lock, flags); + if (ctrl->flags & FCCTRL_TERMIO) { + if (!--ctrl->iocnt) + wake_up(&ctrl->ioabort_wait); + } + spin_unlock_irqrestore(&ctrl->lock, flags); + } +} + +static void +nvme_fc_fcpio_done(struct nvmefc_fcp_req *req) +{ + struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req); + struct request *rq = op->rq; + struct nvmefc_fcp_req *freq = &op->fcp_req; + struct nvme_fc_ctrl *ctrl = op->ctrl; + struct nvme_fc_queue *queue = op->queue; + struct nvme_completion *cqe = &op->rsp_iu.cqe; + struct nvme_command *sqe = &op->cmd_iu.sqe; + __le16 status = cpu_to_le16(NVME_SC_SUCCESS << 1); + union nvme_result result; + bool terminate_assoc = true; + int opstate; + + /* + * WARNING: + * The current linux implementation of a nvme controller + * allocates a single tag set for all io queues and sizes + * the io queues to fully hold all possible tags. Thus, the + * implementation does not reference or care about the sqhd + * value as it never needs to use the sqhd/sqtail pointers + * for submission pacing. + * + * This affects the FC-NVME implementation in two ways: + * 1) As the value doesn't matter, we don't need to waste + * cycles extracting it from ERSPs and stamping it in the + * cases where the transport fabricates CQEs on successful + * completions. + * 2) The FC-NVME implementation requires that delivery of + * ERSP completions are to go back to the nvme layer in order + * relative to the rsn, such that the sqhd value will always + * be "in order" for the nvme layer. As the nvme layer in + * linux doesn't care about sqhd, there's no need to return + * them in order. + * + * Additionally: + * As the core nvme layer in linux currently does not look at + * every field in the cqe - in cases where the FC transport must + * fabricate a CQE, the following fields will not be set as they + * are not referenced: + * cqe.sqid, cqe.sqhd, cqe.command_id + * + * Failure or error of an individual i/o, in a transport + * detected fashion unrelated to the nvme completion status, + * potentially cause the initiator and target sides to get out + * of sync on SQ head/tail (aka outstanding io count allowed). + * Per FC-NVME spec, failure of an individual command requires + * the connection to be terminated, which in turn requires the + * association to be terminated. + */ + + opstate = atomic_xchg(&op->state, FCPOP_STATE_COMPLETE); + + fc_dma_sync_single_for_cpu(ctrl->lport->dev, op->fcp_req.rspdma, + sizeof(op->rsp_iu), DMA_FROM_DEVICE); + + if (opstate == FCPOP_STATE_ABORTED) + status = cpu_to_le16(NVME_SC_ABORT_REQ << 1); + else if (freq->status) + status = cpu_to_le16(NVME_SC_INTERNAL << 1); + + /* + * For the linux implementation, if we have an unsuccesful + * status, they blk-mq layer can typically be called with the + * non-zero status and the content of the cqe isn't important. + */ + if (status) + goto done; + + /* + * command completed successfully relative to the wire + * protocol. However, validate anything received and + * extract the status and result from the cqe (create it + * where necessary). + */ + + switch (freq->rcv_rsplen) { + + case 0: + case NVME_FC_SIZEOF_ZEROS_RSP: + /* + * No response payload or 12 bytes of payload (which + * should all be zeros) are considered successful and + * no payload in the CQE by the transport. + */ + if (freq->transferred_length != + be32_to_cpu(op->cmd_iu.data_len)) { + status = cpu_to_le16(NVME_SC_INTERNAL << 1); + goto done; + } + result.u64 = 0; + break; + + case sizeof(struct nvme_fc_ersp_iu): + /* + * The ERSP IU contains a full completion with CQE. + * Validate ERSP IU and look at cqe. + */ + if (unlikely(be16_to_cpu(op->rsp_iu.iu_len) != + (freq->rcv_rsplen / 4) || + be32_to_cpu(op->rsp_iu.xfrd_len) != + freq->transferred_length || + op->rsp_iu.status_code || + sqe->common.command_id != cqe->command_id)) { + status = cpu_to_le16(NVME_SC_INTERNAL << 1); + goto done; + } + result = cqe->result; + status = cqe->status; + break; + + default: + status = cpu_to_le16(NVME_SC_INTERNAL << 1); + goto done; + } + + terminate_assoc = false; + +done: + if (op->flags & FCOP_FLAGS_AEN) { + nvme_complete_async_event(&queue->ctrl->ctrl, status, &result); + __nvme_fc_fcpop_chk_teardowns(ctrl, op, opstate); + atomic_set(&op->state, FCPOP_STATE_IDLE); + op->flags = FCOP_FLAGS_AEN; /* clear other flags */ + nvme_fc_ctrl_put(ctrl); + goto check_error; + } + + __nvme_fc_fcpop_chk_teardowns(ctrl, op, opstate); + nvme_end_request(rq, status, result); + +check_error: + if (terminate_assoc) + nvme_fc_error_recovery(ctrl, "transport detected io error"); +} + +static int +__nvme_fc_init_request(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_queue *queue, struct nvme_fc_fcp_op *op, + struct request *rq, u32 rqno) +{ + struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; + int ret = 0; + + memset(op, 0, sizeof(*op)); + op->fcp_req.cmdaddr = &op->cmd_iu; + op->fcp_req.cmdlen = sizeof(op->cmd_iu); + op->fcp_req.rspaddr = &op->rsp_iu; + op->fcp_req.rsplen = sizeof(op->rsp_iu); + op->fcp_req.done = nvme_fc_fcpio_done; + op->fcp_req.first_sgl = (struct scatterlist *)&op[1]; + op->fcp_req.private = &op->fcp_req.first_sgl[SG_CHUNK_SIZE]; + op->ctrl = ctrl; + op->queue = queue; + op->rq = rq; + op->rqno = rqno; + + cmdiu->scsi_id = NVME_CMD_SCSI_ID; + cmdiu->fc_id = NVME_CMD_FC_ID; + cmdiu->iu_len = cpu_to_be16(sizeof(*cmdiu) / sizeof(u32)); + + op->fcp_req.cmddma = fc_dma_map_single(ctrl->lport->dev, + &op->cmd_iu, sizeof(op->cmd_iu), DMA_TO_DEVICE); + if (fc_dma_mapping_error(ctrl->lport->dev, op->fcp_req.cmddma)) { + dev_err(ctrl->dev, + "FCP Op failed - cmdiu dma mapping failed.\n"); + ret = -EFAULT; + goto out_on_error; + } + + op->fcp_req.rspdma = fc_dma_map_single(ctrl->lport->dev, + &op->rsp_iu, sizeof(op->rsp_iu), + DMA_FROM_DEVICE); + if (fc_dma_mapping_error(ctrl->lport->dev, op->fcp_req.rspdma)) { + dev_err(ctrl->dev, + "FCP Op failed - rspiu dma mapping failed.\n"); + ret = -EFAULT; + } + + atomic_set(&op->state, FCPOP_STATE_IDLE); +out_on_error: + return ret; +} + +static int +nvme_fc_init_request(struct blk_mq_tag_set *set, struct request *rq, + unsigned int hctx_idx, unsigned int numa_node) +{ + struct nvme_fc_ctrl *ctrl = set->driver_data; + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0; + struct nvme_fc_queue *queue = &ctrl->queues[queue_idx]; + + nvme_req(rq)->ctrl = &ctrl->ctrl; + return __nvme_fc_init_request(ctrl, queue, op, rq, queue->rqcnt++); +} + +static int +nvme_fc_init_aen_ops(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_fcp_op *aen_op; + struct nvme_fc_cmd_iu *cmdiu; + struct nvme_command *sqe; + void *private; + int i, ret; + + aen_op = ctrl->aen_ops; + for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) { + private = kzalloc(ctrl->lport->ops->fcprqst_priv_sz, + GFP_KERNEL); + if (!private) + return -ENOMEM; + + cmdiu = &aen_op->cmd_iu; + sqe = &cmdiu->sqe; + ret = __nvme_fc_init_request(ctrl, &ctrl->queues[0], + aen_op, (struct request *)NULL, + (NVME_AQ_BLK_MQ_DEPTH + i)); + if (ret) { + kfree(private); + return ret; + } + + aen_op->flags = FCOP_FLAGS_AEN; + aen_op->fcp_req.first_sgl = NULL; /* no sg list */ + aen_op->fcp_req.private = private; + + memset(sqe, 0, sizeof(*sqe)); + sqe->common.opcode = nvme_admin_async_event; + /* Note: core layer may overwrite the sqe.command_id value */ + sqe->common.command_id = NVME_AQ_BLK_MQ_DEPTH + i; + } + return 0; +} + +static void +nvme_fc_term_aen_ops(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_fcp_op *aen_op; + int i; + + cancel_work_sync(&ctrl->ctrl.async_event_work); + aen_op = ctrl->aen_ops; + for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) { + if (!aen_op->fcp_req.private) + continue; + + __nvme_fc_exit_request(ctrl, aen_op); + + kfree(aen_op->fcp_req.private); + aen_op->fcp_req.private = NULL; + } +} + +static inline void +__nvme_fc_init_hctx(struct blk_mq_hw_ctx *hctx, struct nvme_fc_ctrl *ctrl, + unsigned int qidx) +{ + struct nvme_fc_queue *queue = &ctrl->queues[qidx]; + + hctx->driver_data = queue; + queue->hctx = hctx; +} + +static int +nvme_fc_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_fc_ctrl *ctrl = data; + + __nvme_fc_init_hctx(hctx, ctrl, hctx_idx + 1); + + return 0; +} + +static int +nvme_fc_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_fc_ctrl *ctrl = data; + + __nvme_fc_init_hctx(hctx, ctrl, hctx_idx); + + return 0; +} + +static void +nvme_fc_init_queue(struct nvme_fc_ctrl *ctrl, int idx) +{ + struct nvme_fc_queue *queue; + + queue = &ctrl->queues[idx]; + memset(queue, 0, sizeof(*queue)); + queue->ctrl = ctrl; + queue->qnum = idx; + atomic_set(&queue->csn, 0); + queue->dev = ctrl->dev; + + if (idx > 0) + queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16; + else + queue->cmnd_capsule_len = sizeof(struct nvme_command); + + /* + * Considered whether we should allocate buffers for all SQEs + * and CQEs and dma map them - mapping their respective entries + * into the request structures (kernel vm addr and dma address) + * thus the driver could use the buffers/mappings directly. + * It only makes sense if the LLDD would use them for its + * messaging api. It's very unlikely most adapter api's would use + * a native NVME sqe/cqe. More reasonable if FC-NVME IU payload + * structures were used instead. + */ +} + +/* + * This routine terminates a queue at the transport level. + * The transport has already ensured that all outstanding ios on + * the queue have been terminated. + * The transport will send a Disconnect LS request to terminate + * the queue's connection. Termination of the admin queue will also + * terminate the association at the target. + */ +static void +nvme_fc_free_queue(struct nvme_fc_queue *queue) +{ + if (!test_and_clear_bit(NVME_FC_Q_CONNECTED, &queue->flags)) + return; + + clear_bit(NVME_FC_Q_LIVE, &queue->flags); + /* + * Current implementation never disconnects a single queue. + * It always terminates a whole association. So there is never + * a disconnect(queue) LS sent to the target. + */ + + queue->connection_id = 0; + atomic_set(&queue->csn, 0); +} + +static void +__nvme_fc_delete_hw_queue(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_queue *queue, unsigned int qidx) +{ + if (ctrl->lport->ops->delete_queue) + ctrl->lport->ops->delete_queue(&ctrl->lport->localport, qidx, + queue->lldd_handle); + queue->lldd_handle = NULL; +} + +static void +nvme_fc_free_io_queues(struct nvme_fc_ctrl *ctrl) +{ + int i; + + for (i = 1; i < ctrl->ctrl.queue_count; i++) + nvme_fc_free_queue(&ctrl->queues[i]); +} + +static int +__nvme_fc_create_hw_queue(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_queue *queue, unsigned int qidx, u16 qsize) +{ + int ret = 0; + + queue->lldd_handle = NULL; + if (ctrl->lport->ops->create_queue) + ret = ctrl->lport->ops->create_queue(&ctrl->lport->localport, + qidx, qsize, &queue->lldd_handle); + + return ret; +} + +static void +nvme_fc_delete_hw_io_queues(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_queue *queue = &ctrl->queues[ctrl->ctrl.queue_count - 1]; + int i; + + for (i = ctrl->ctrl.queue_count - 1; i >= 1; i--, queue--) + __nvme_fc_delete_hw_queue(ctrl, queue, i); +} + +static int +nvme_fc_create_hw_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize) +{ + struct nvme_fc_queue *queue = &ctrl->queues[1]; + int i, ret; + + for (i = 1; i < ctrl->ctrl.queue_count; i++, queue++) { + ret = __nvme_fc_create_hw_queue(ctrl, queue, i, qsize); + if (ret) + goto delete_queues; + } + + return 0; + +delete_queues: + for (; i >= 0; i--) + __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[i], i); + return ret; +} + +static int +nvme_fc_connect_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize) +{ + int i, ret = 0; + + for (i = 1; i < ctrl->ctrl.queue_count; i++) { + ret = nvme_fc_connect_queue(ctrl, &ctrl->queues[i], qsize, + (qsize / 5)); + if (ret) + break; + ret = nvmf_connect_io_queue(&ctrl->ctrl, i); + if (ret) + break; + + set_bit(NVME_FC_Q_LIVE, &ctrl->queues[i].flags); + } + + return ret; +} + +static void +nvme_fc_init_io_queues(struct nvme_fc_ctrl *ctrl) +{ + int i; + + for (i = 1; i < ctrl->ctrl.queue_count; i++) + nvme_fc_init_queue(ctrl, i); +} + +static void +nvme_fc_ctrl_free(struct kref *ref) +{ + struct nvme_fc_ctrl *ctrl = + container_of(ref, struct nvme_fc_ctrl, ref); + unsigned long flags; + + if (ctrl->ctrl.tagset) { + blk_cleanup_queue(ctrl->ctrl.connect_q); + blk_mq_free_tag_set(&ctrl->tag_set); + } + + /* remove from rport list */ + spin_lock_irqsave(&ctrl->rport->lock, flags); + list_del(&ctrl->ctrl_list); + spin_unlock_irqrestore(&ctrl->rport->lock, flags); + + blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); + blk_cleanup_queue(ctrl->ctrl.admin_q); + blk_mq_free_tag_set(&ctrl->admin_tag_set); + + kfree(ctrl->queues); + + put_device(ctrl->dev); + nvme_fc_rport_put(ctrl->rport); + + ida_simple_remove(&nvme_fc_ctrl_cnt, ctrl->cnum); + if (ctrl->ctrl.opts) + nvmf_free_options(ctrl->ctrl.opts); + kfree(ctrl); +} + +static void +nvme_fc_ctrl_put(struct nvme_fc_ctrl *ctrl) +{ + kref_put(&ctrl->ref, nvme_fc_ctrl_free); +} + +static int +nvme_fc_ctrl_get(struct nvme_fc_ctrl *ctrl) +{ + return kref_get_unless_zero(&ctrl->ref); +} + +/* + * All accesses from nvme core layer done - can now free the + * controller. Called after last nvme_put_ctrl() call + */ +static void +nvme_fc_nvme_ctrl_freed(struct nvme_ctrl *nctrl) +{ + struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); + + WARN_ON(nctrl != &ctrl->ctrl); + + nvme_fc_ctrl_put(ctrl); +} + +static void +nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg) +{ + int active; + + /* + * if an error (io timeout, etc) while (re)connecting, + * it's an error on creating the new association. + * Start the error recovery thread if it hasn't already + * been started. It is expected there could be multiple + * ios hitting this path before things are cleaned up. + */ + if (ctrl->ctrl.state == NVME_CTRL_CONNECTING) { + active = atomic_xchg(&ctrl->err_work_active, 1); + if (!active && !queue_work(nvme_fc_wq, &ctrl->err_work)) { + atomic_set(&ctrl->err_work_active, 0); + WARN_ON(1); + } + return; + } + + /* Otherwise, only proceed if in LIVE state - e.g. on first error */ + if (ctrl->ctrl.state != NVME_CTRL_LIVE) + return; + + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: transport association error detected: %s\n", + ctrl->cnum, errmsg); + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: resetting controller\n", ctrl->cnum); + + nvme_reset_ctrl(&ctrl->ctrl); +} + +static enum blk_eh_timer_return +nvme_fc_timeout(struct request *rq, bool reserved) +{ + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_ctrl *ctrl = op->ctrl; + + /* + * we can't individually ABTS an io without affecting the queue, + * thus killing the queue, and thus the association. + * So resolve by performing a controller reset, which will stop + * the host/io stack, terminate the association on the link, + * and recreate an association on the link. + */ + nvme_fc_error_recovery(ctrl, "io timeout error"); + + /* + * the io abort has been initiated. Have the reset timer + * restarted and the abort completion will complete the io + * shortly. Avoids a synchronous wait while the abort finishes. + */ + return BLK_EH_RESET_TIMER; +} + +static int +nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq, + struct nvme_fc_fcp_op *op) +{ + struct nvmefc_fcp_req *freq = &op->fcp_req; + enum dma_data_direction dir; + int ret; + + freq->sg_cnt = 0; + + if (!blk_rq_payload_bytes(rq)) + return 0; + + freq->sg_table.sgl = freq->first_sgl; + ret = sg_alloc_table_chained(&freq->sg_table, + blk_rq_nr_phys_segments(rq), freq->sg_table.sgl); + if (ret) + return -ENOMEM; + + op->nents = blk_rq_map_sg(rq->q, rq, freq->sg_table.sgl); + WARN_ON(op->nents > blk_rq_nr_phys_segments(rq)); + dir = (rq_data_dir(rq) == WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; + freq->sg_cnt = fc_dma_map_sg(ctrl->lport->dev, freq->sg_table.sgl, + op->nents, dir); + if (unlikely(freq->sg_cnt <= 0)) { + sg_free_table_chained(&freq->sg_table, true); + freq->sg_cnt = 0; + return -EFAULT; + } + + /* + * TODO: blk_integrity_rq(rq) for DIF + */ + return 0; +} + +static void +nvme_fc_unmap_data(struct nvme_fc_ctrl *ctrl, struct request *rq, + struct nvme_fc_fcp_op *op) +{ + struct nvmefc_fcp_req *freq = &op->fcp_req; + + if (!freq->sg_cnt) + return; + + fc_dma_unmap_sg(ctrl->lport->dev, freq->sg_table.sgl, op->nents, + ((rq_data_dir(rq) == WRITE) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE)); + + nvme_cleanup_cmd(rq); + + sg_free_table_chained(&freq->sg_table, true); + + freq->sg_cnt = 0; +} + +/* + * In FC, the queue is a logical thing. At transport connect, the target + * creates its "queue" and returns a handle that is to be given to the + * target whenever it posts something to the corresponding SQ. When an + * SQE is sent on a SQ, FC effectively considers the SQE, or rather the + * command contained within the SQE, an io, and assigns a FC exchange + * to it. The SQE and the associated SQ handle are sent in the initial + * CMD IU sents on the exchange. All transfers relative to the io occur + * as part of the exchange. The CQE is the last thing for the io, + * which is transferred (explicitly or implicitly) with the RSP IU + * sent on the exchange. After the CQE is received, the FC exchange is + * terminaed and the Exchange may be used on a different io. + * + * The transport to LLDD api has the transport making a request for a + * new fcp io request to the LLDD. The LLDD then allocates a FC exchange + * resource and transfers the command. The LLDD will then process all + * steps to complete the io. Upon completion, the transport done routine + * is called. + * + * So - while the operation is outstanding to the LLDD, there is a link + * level FC exchange resource that is also outstanding. This must be + * considered in all cleanup operations. + */ +static blk_status_t +nvme_fc_start_fcp_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, + struct nvme_fc_fcp_op *op, u32 data_len, + enum nvmefc_fcp_datadir io_dir) +{ + struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; + struct nvme_command *sqe = &cmdiu->sqe; + int ret, opstate; + + /* + * before attempting to send the io, check to see if we believe + * the target device is present + */ + if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE) + return BLK_STS_RESOURCE; + + if (!nvme_fc_ctrl_get(ctrl)) + return BLK_STS_IOERR; + + /* format the FC-NVME CMD IU and fcp_req */ + cmdiu->connection_id = cpu_to_be64(queue->connection_id); + cmdiu->data_len = cpu_to_be32(data_len); + switch (io_dir) { + case NVMEFC_FCP_WRITE: + cmdiu->flags = FCNVME_CMD_FLAGS_WRITE; + break; + case NVMEFC_FCP_READ: + cmdiu->flags = FCNVME_CMD_FLAGS_READ; + break; + case NVMEFC_FCP_NODATA: + cmdiu->flags = 0; + break; + } + op->fcp_req.payload_length = data_len; + op->fcp_req.io_dir = io_dir; + op->fcp_req.transferred_length = 0; + op->fcp_req.rcv_rsplen = 0; + op->fcp_req.status = NVME_SC_SUCCESS; + op->fcp_req.sqid = cpu_to_le16(queue->qnum); + + /* + * validate per fabric rules, set fields mandated by fabric spec + * as well as those by FC-NVME spec. + */ + WARN_ON_ONCE(sqe->common.metadata); + sqe->common.flags |= NVME_CMD_SGL_METABUF; + + /* + * format SQE DPTR field per FC-NVME rules: + * type=0x5 Transport SGL Data Block Descriptor + * subtype=0xA Transport-specific value + * address=0 + * length=length of the data series + */ + sqe->rw.dptr.sgl.type = (NVME_TRANSPORT_SGL_DATA_DESC << 4) | + NVME_SGL_FMT_TRANSPORT_A; + sqe->rw.dptr.sgl.length = cpu_to_le32(data_len); + sqe->rw.dptr.sgl.addr = 0; + + if (!(op->flags & FCOP_FLAGS_AEN)) { + ret = nvme_fc_map_data(ctrl, op->rq, op); + if (ret < 0) { + nvme_cleanup_cmd(op->rq); + nvme_fc_ctrl_put(ctrl); + if (ret == -ENOMEM || ret == -EAGAIN) + return BLK_STS_RESOURCE; + return BLK_STS_IOERR; + } + } + + fc_dma_sync_single_for_device(ctrl->lport->dev, op->fcp_req.cmddma, + sizeof(op->cmd_iu), DMA_TO_DEVICE); + + atomic_set(&op->state, FCPOP_STATE_ACTIVE); + + if (!(op->flags & FCOP_FLAGS_AEN)) + blk_mq_start_request(op->rq); + + cmdiu->csn = cpu_to_be32(atomic_inc_return(&queue->csn)); + ret = ctrl->lport->ops->fcp_io(&ctrl->lport->localport, + &ctrl->rport->remoteport, + queue->lldd_handle, &op->fcp_req); + + if (ret) { + /* + * If the lld fails to send the command is there an issue with + * the csn value? If the command that fails is the Connect, + * no - as the connection won't be live. If it is a command + * post-connect, it's possible a gap in csn may be created. + * Does this matter? As Linux initiators don't send fused + * commands, no. The gap would exist, but as there's nothing + * that depends on csn order to be delivered on the target + * side, it shouldn't hurt. It would be difficult for a + * target to even detect the csn gap as it has no idea when the + * cmd with the csn was supposed to arrive. + */ + opstate = atomic_xchg(&op->state, FCPOP_STATE_COMPLETE); + __nvme_fc_fcpop_chk_teardowns(ctrl, op, opstate); + + if (!(op->flags & FCOP_FLAGS_AEN)) + nvme_fc_unmap_data(ctrl, op->rq, op); + + nvme_fc_ctrl_put(ctrl); + + if (ctrl->rport->remoteport.port_state == FC_OBJSTATE_ONLINE && + ret != -EBUSY) + return BLK_STS_IOERR; + + return BLK_STS_RESOURCE; + } + + return BLK_STS_OK; +} + +static blk_status_t +nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct nvme_ns *ns = hctx->queue->queuedata; + struct nvme_fc_queue *queue = hctx->driver_data; + struct nvme_fc_ctrl *ctrl = queue->ctrl; + struct request *rq = bd->rq; + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; + struct nvme_command *sqe = &cmdiu->sqe; + enum nvmefc_fcp_datadir io_dir; + bool queue_ready = test_bit(NVME_FC_Q_LIVE, &queue->flags); + u32 data_len; + blk_status_t ret; + + if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE || + !nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready)) + return nvmf_fail_nonready_command(&queue->ctrl->ctrl, rq); + + ret = nvme_setup_cmd(ns, rq, sqe); + if (ret) + return ret; + + data_len = blk_rq_payload_bytes(rq); + if (data_len) + io_dir = ((rq_data_dir(rq) == WRITE) ? + NVMEFC_FCP_WRITE : NVMEFC_FCP_READ); + else + io_dir = NVMEFC_FCP_NODATA; + + return nvme_fc_start_fcp_op(ctrl, queue, op, data_len, io_dir); +} + +static struct blk_mq_tags * +nvme_fc_tagset(struct nvme_fc_queue *queue) +{ + if (queue->qnum == 0) + return queue->ctrl->admin_tag_set.tags[queue->qnum]; + + return queue->ctrl->tag_set.tags[queue->qnum - 1]; +} + +static int +nvme_fc_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) + +{ + struct nvme_fc_queue *queue = hctx->driver_data; + struct nvme_fc_ctrl *ctrl = queue->ctrl; + struct request *req; + struct nvme_fc_fcp_op *op; + + req = blk_mq_tag_to_rq(nvme_fc_tagset(queue), tag); + if (!req) + return 0; + + op = blk_mq_rq_to_pdu(req); + + if ((atomic_read(&op->state) == FCPOP_STATE_ACTIVE) && + (ctrl->lport->ops->poll_queue)) + ctrl->lport->ops->poll_queue(&ctrl->lport->localport, + queue->lldd_handle); + + return ((atomic_read(&op->state) != FCPOP_STATE_ACTIVE)); +} + +static void +nvme_fc_submit_async_event(struct nvme_ctrl *arg) +{ + struct nvme_fc_ctrl *ctrl = to_fc_ctrl(arg); + struct nvme_fc_fcp_op *aen_op; + unsigned long flags; + bool terminating = false; + blk_status_t ret; + + spin_lock_irqsave(&ctrl->lock, flags); + if (ctrl->flags & FCCTRL_TERMIO) + terminating = true; + spin_unlock_irqrestore(&ctrl->lock, flags); + + if (terminating) + return; + + aen_op = &ctrl->aen_ops[0]; + + ret = nvme_fc_start_fcp_op(ctrl, aen_op->queue, aen_op, 0, + NVMEFC_FCP_NODATA); + if (ret) + dev_err(ctrl->ctrl.device, + "failed async event work\n"); +} + +static void +nvme_fc_complete_rq(struct request *rq) +{ + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_ctrl *ctrl = op->ctrl; + + atomic_set(&op->state, FCPOP_STATE_IDLE); + + nvme_fc_unmap_data(ctrl, rq, op); + nvme_complete_rq(rq); + nvme_fc_ctrl_put(ctrl); +} + +/* + * This routine is used by the transport when it needs to find active + * io on a queue that is to be terminated. The transport uses + * blk_mq_tagset_busy_itr() to find the busy requests, which then invoke + * this routine to kill them on a 1 by 1 basis. + * + * As FC allocates FC exchange for each io, the transport must contact + * the LLDD to terminate the exchange, thus releasing the FC exchange. + * After terminating the exchange the LLDD will call the transport's + * normal io done path for the request, but it will have an aborted + * status. The done path will return the io request back to the block + * layer with an error status. + */ +static void +nvme_fc_terminate_exchange(struct request *req, void *data, bool reserved) +{ + struct nvme_ctrl *nctrl = data; + struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(req); + + __nvme_fc_abort_op(ctrl, op); +} + + +static const struct blk_mq_ops nvme_fc_mq_ops = { + .queue_rq = nvme_fc_queue_rq, + .complete = nvme_fc_complete_rq, + .init_request = nvme_fc_init_request, + .exit_request = nvme_fc_exit_request, + .init_hctx = nvme_fc_init_hctx, + .poll = nvme_fc_poll, + .timeout = nvme_fc_timeout, +}; + +static int +nvme_fc_create_io_queues(struct nvme_fc_ctrl *ctrl) +{ + struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; + unsigned int nr_io_queues; + int ret; + + nr_io_queues = min(min(opts->nr_io_queues, num_online_cpus()), + ctrl->lport->ops->max_hw_queues); + ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); + if (ret) { + dev_info(ctrl->ctrl.device, + "set_queue_count failed: %d\n", ret); + return ret; + } + + ctrl->ctrl.queue_count = nr_io_queues + 1; + if (!nr_io_queues) + return 0; + + nvme_fc_init_io_queues(ctrl); + + memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); + ctrl->tag_set.ops = &nvme_fc_mq_ops; + ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; + ctrl->tag_set.reserved_tags = 1; /* fabric connect */ + ctrl->tag_set.numa_node = NUMA_NO_NODE; + ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; + ctrl->tag_set.cmd_size = sizeof(struct nvme_fc_fcp_op) + + (SG_CHUNK_SIZE * + sizeof(struct scatterlist)) + + ctrl->lport->ops->fcprqst_priv_sz; + ctrl->tag_set.driver_data = ctrl; + ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; + ctrl->tag_set.timeout = NVME_IO_TIMEOUT; + + ret = blk_mq_alloc_tag_set(&ctrl->tag_set); + if (ret) + return ret; + + ctrl->ctrl.tagset = &ctrl->tag_set; + + ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); + if (IS_ERR(ctrl->ctrl.connect_q)) { + ret = PTR_ERR(ctrl->ctrl.connect_q); + goto out_free_tag_set; + } + + ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize + 1); + if (ret) + goto out_cleanup_blk_queue; + + ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize + 1); + if (ret) + goto out_delete_hw_queues; + + ctrl->ioq_live = true; + + return 0; + +out_delete_hw_queues: + nvme_fc_delete_hw_io_queues(ctrl); +out_cleanup_blk_queue: + blk_cleanup_queue(ctrl->ctrl.connect_q); +out_free_tag_set: + blk_mq_free_tag_set(&ctrl->tag_set); + nvme_fc_free_io_queues(ctrl); + + /* force put free routine to ignore io queues */ + ctrl->ctrl.tagset = NULL; + + return ret; +} + +static int +nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl) +{ + struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; + unsigned int nr_io_queues; + int ret; + + nr_io_queues = min(min(opts->nr_io_queues, num_online_cpus()), + ctrl->lport->ops->max_hw_queues); + ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); + if (ret) { + dev_info(ctrl->ctrl.device, + "set_queue_count failed: %d\n", ret); + return ret; + } + + ctrl->ctrl.queue_count = nr_io_queues + 1; + /* check for io queues existing */ + if (ctrl->ctrl.queue_count == 1) + return 0; + + ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize + 1); + if (ret) + goto out_free_io_queues; + + ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize + 1); + if (ret) + goto out_delete_hw_queues; + + blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues); + + return 0; + +out_delete_hw_queues: + nvme_fc_delete_hw_io_queues(ctrl); +out_free_io_queues: + nvme_fc_free_io_queues(ctrl); + return ret; +} + +static void +nvme_fc_rport_active_on_lport(struct nvme_fc_rport *rport) +{ + struct nvme_fc_lport *lport = rport->lport; + + atomic_inc(&lport->act_rport_cnt); +} + +static void +nvme_fc_rport_inactive_on_lport(struct nvme_fc_rport *rport) +{ + struct nvme_fc_lport *lport = rport->lport; + u32 cnt; + + cnt = atomic_dec_return(&lport->act_rport_cnt); + if (cnt == 0 && lport->localport.port_state == FC_OBJSTATE_DELETED) + lport->ops->localport_delete(&lport->localport); +} + +static int +nvme_fc_ctlr_active_on_rport(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_rport *rport = ctrl->rport; + u32 cnt; + + if (ctrl->assoc_active) + return 1; + + ctrl->assoc_active = true; + cnt = atomic_inc_return(&rport->act_ctrl_cnt); + if (cnt == 1) + nvme_fc_rport_active_on_lport(rport); + + return 0; +} + +static int +nvme_fc_ctlr_inactive_on_rport(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_rport *rport = ctrl->rport; + struct nvme_fc_lport *lport = rport->lport; + u32 cnt; + + /* ctrl->assoc_active=false will be set independently */ + + cnt = atomic_dec_return(&rport->act_ctrl_cnt); + if (cnt == 0) { + if (rport->remoteport.port_state == FC_OBJSTATE_DELETED) + lport->ops->remoteport_delete(&rport->remoteport); + nvme_fc_rport_inactive_on_lport(rport); + } + + return 0; +} + +/* + * This routine restarts the controller on the host side, and + * on the link side, recreates the controller association. + */ +static int +nvme_fc_create_association(struct nvme_fc_ctrl *ctrl) +{ + struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; + int ret; + bool changed; + + ++ctrl->ctrl.nr_reconnects; + + if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE) + return -ENODEV; + + if (nvme_fc_ctlr_active_on_rport(ctrl)) + return -ENOTUNIQ; + + /* + * Create the admin queue + */ + + ret = __nvme_fc_create_hw_queue(ctrl, &ctrl->queues[0], 0, + NVME_AQ_DEPTH); + if (ret) + goto out_free_queue; + + ret = nvme_fc_connect_admin_queue(ctrl, &ctrl->queues[0], + NVME_AQ_DEPTH, (NVME_AQ_DEPTH / 4)); + if (ret) + goto out_delete_hw_queue; + + blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); + + ret = nvmf_connect_admin_queue(&ctrl->ctrl); + if (ret) + goto out_disconnect_admin_queue; + + set_bit(NVME_FC_Q_LIVE, &ctrl->queues[0].flags); + + /* + * Check controller capabilities + * + * todo:- add code to check if ctrl attributes changed from + * prior connection values + */ + + ret = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); + if (ret) { + dev_err(ctrl->ctrl.device, + "prop_get NVME_REG_CAP failed\n"); + goto out_disconnect_admin_queue; + } + + ctrl->ctrl.sqsize = + min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); + + ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); + if (ret) + goto out_disconnect_admin_queue; + + ctrl->ctrl.max_hw_sectors = + (ctrl->lport->ops->max_sgl_segments - 1) << (PAGE_SHIFT - 9); + + ret = nvme_init_identify(&ctrl->ctrl); + if (ret) + goto out_disconnect_admin_queue; + + /* sanity checks */ + + /* FC-NVME does not have other data in the capsule */ + if (ctrl->ctrl.icdoff) { + dev_err(ctrl->ctrl.device, "icdoff %d is not supported!\n", + ctrl->ctrl.icdoff); + goto out_disconnect_admin_queue; + } + + /* FC-NVME supports normal SGL Data Block Descriptors */ + + if (opts->queue_size > ctrl->ctrl.maxcmd) { + /* warn if maxcmd is lower than queue_size */ + dev_warn(ctrl->ctrl.device, + "queue_size %zu > ctrl maxcmd %u, reducing " + "to queue_size\n", + opts->queue_size, ctrl->ctrl.maxcmd); + opts->queue_size = ctrl->ctrl.maxcmd; + } + + if (opts->queue_size > ctrl->ctrl.sqsize + 1) { + /* warn if sqsize is lower than queue_size */ + dev_warn(ctrl->ctrl.device, + "queue_size %zu > ctrl sqsize %u, clamping down\n", + opts->queue_size, ctrl->ctrl.sqsize + 1); + opts->queue_size = ctrl->ctrl.sqsize + 1; + } + + ret = nvme_fc_init_aen_ops(ctrl); + if (ret) + goto out_term_aen_ops; + + /* + * Create the io queues + */ + + if (ctrl->ctrl.queue_count > 1) { + if (!ctrl->ioq_live) + ret = nvme_fc_create_io_queues(ctrl); + else + ret = nvme_fc_recreate_io_queues(ctrl); + if (ret) + goto out_term_aen_ops; + } + + changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); + + ctrl->ctrl.nr_reconnects = 0; + + if (changed) + nvme_start_ctrl(&ctrl->ctrl); + + return 0; /* Success */ + +out_term_aen_ops: + nvme_fc_term_aen_ops(ctrl); +out_disconnect_admin_queue: + /* send a Disconnect(association) LS to fc-nvme target */ + nvme_fc_xmt_disconnect_assoc(ctrl); +out_delete_hw_queue: + __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0); +out_free_queue: + nvme_fc_free_queue(&ctrl->queues[0]); + ctrl->assoc_active = false; + nvme_fc_ctlr_inactive_on_rport(ctrl); + + return ret; +} + +/* + * This routine stops operation of the controller on the host side. + * On the host os stack side: Admin and IO queues are stopped, + * outstanding ios on them terminated via FC ABTS. + * On the link side: the association is terminated. + */ +static void +nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl) +{ + unsigned long flags; + + if (!ctrl->assoc_active) + return; + ctrl->assoc_active = false; + + spin_lock_irqsave(&ctrl->lock, flags); + ctrl->flags |= FCCTRL_TERMIO; + ctrl->iocnt = 0; + spin_unlock_irqrestore(&ctrl->lock, flags); + + /* + * If io queues are present, stop them and terminate all outstanding + * ios on them. As FC allocates FC exchange for each io, the + * transport must contact the LLDD to terminate the exchange, + * thus releasing the FC exchange. We use blk_mq_tagset_busy_itr() + * to tell us what io's are busy and invoke a transport routine + * to kill them with the LLDD. After terminating the exchange + * the LLDD will call the transport's normal io done path, but it + * will have an aborted status. The done path will return the + * io requests back to the block layer as part of normal completions + * (but with error status). + */ + if (ctrl->ctrl.queue_count > 1) { + nvme_stop_queues(&ctrl->ctrl); + blk_mq_tagset_busy_iter(&ctrl->tag_set, + nvme_fc_terminate_exchange, &ctrl->ctrl); + } + + /* + * Other transports, which don't have link-level contexts bound + * to sqe's, would try to gracefully shutdown the controller by + * writing the registers for shutdown and polling (call + * nvme_shutdown_ctrl()). Given a bunch of i/o was potentially + * just aborted and we will wait on those contexts, and given + * there was no indication of how live the controlelr is on the + * link, don't send more io to create more contexts for the + * shutdown. Let the controller fail via keepalive failure if + * its still present. + */ + + /* + * clean up the admin queue. Same thing as above. + * use blk_mq_tagset_busy_itr() and the transport routine to + * terminate the exchanges. + */ + blk_mq_quiesce_queue(ctrl->ctrl.admin_q); + blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, + nvme_fc_terminate_exchange, &ctrl->ctrl); + + /* kill the aens as they are a separate path */ + nvme_fc_abort_aen_ops(ctrl); + + /* wait for all io that had to be aborted */ + spin_lock_irq(&ctrl->lock); + wait_event_lock_irq(ctrl->ioabort_wait, ctrl->iocnt == 0, ctrl->lock); + ctrl->flags &= ~FCCTRL_TERMIO; + spin_unlock_irq(&ctrl->lock); + + nvme_fc_term_aen_ops(ctrl); + + /* + * send a Disconnect(association) LS to fc-nvme target + * Note: could have been sent at top of process, but + * cleaner on link traffic if after the aborts complete. + * Note: if association doesn't exist, association_id will be 0 + */ + if (ctrl->association_id) + nvme_fc_xmt_disconnect_assoc(ctrl); + + if (ctrl->ctrl.tagset) { + nvme_fc_delete_hw_io_queues(ctrl); + nvme_fc_free_io_queues(ctrl); + } + + __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0); + nvme_fc_free_queue(&ctrl->queues[0]); + + /* re-enable the admin_q so anything new can fast fail */ + blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); + + /* resume the io queues so that things will fast fail */ + nvme_start_queues(&ctrl->ctrl); + + nvme_fc_ctlr_inactive_on_rport(ctrl); +} + +static void +nvme_fc_delete_ctrl(struct nvme_ctrl *nctrl) +{ + struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); + + cancel_work_sync(&ctrl->err_work); + cancel_delayed_work_sync(&ctrl->connect_work); + /* + * kill the association on the link side. this will block + * waiting for io to terminate + */ + nvme_fc_delete_association(ctrl); +} + +static void +nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status) +{ + struct nvme_fc_rport *rport = ctrl->rport; + struct nvme_fc_remote_port *portptr = &rport->remoteport; + unsigned long recon_delay = ctrl->ctrl.opts->reconnect_delay * HZ; + bool recon = true; + + if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) + return; + + if (portptr->port_state == FC_OBJSTATE_ONLINE) + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: reset: Reconnect attempt failed (%d)\n", + ctrl->cnum, status); + else if (time_after_eq(jiffies, rport->dev_loss_end)) + recon = false; + + if (recon && nvmf_should_reconnect(&ctrl->ctrl)) { + if (portptr->port_state == FC_OBJSTATE_ONLINE) + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: Reconnect attempt in %ld " + "seconds\n", + ctrl->cnum, recon_delay / HZ); + else if (time_after(jiffies + recon_delay, rport->dev_loss_end)) + recon_delay = rport->dev_loss_end - jiffies; + + queue_delayed_work(nvme_wq, &ctrl->connect_work, recon_delay); + } else { + if (portptr->port_state == FC_OBJSTATE_ONLINE) + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: Max reconnect attempts (%d) " + "reached.\n", + ctrl->cnum, ctrl->ctrl.nr_reconnects); + else + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: dev_loss_tmo (%d) expired " + "while waiting for remoteport connectivity.\n", + ctrl->cnum, portptr->dev_loss_tmo); + WARN_ON(nvme_delete_ctrl(&ctrl->ctrl)); + } +} + +static void +__nvme_fc_terminate_io(struct nvme_fc_ctrl *ctrl) +{ + /* + * if state is connecting - the error occurred as part of a + * reconnect attempt. The create_association error paths will + * clean up any outstanding io. + * + * if it's a different state - ensure all pending io is + * terminated. Given this can delay while waiting for the + * aborted io to return, we recheck adapter state below + * before changing state. + */ + if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) { + nvme_stop_keep_alive(&ctrl->ctrl); + + /* will block will waiting for io to terminate */ + nvme_fc_delete_association(ctrl); + } + + if (ctrl->ctrl.state != NVME_CTRL_CONNECTING && + !nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) + dev_err(ctrl->ctrl.device, + "NVME-FC{%d}: error_recovery: Couldn't change state " + "to CONNECTING\n", ctrl->cnum); +} + +static void +nvme_fc_reset_ctrl_work(struct work_struct *work) +{ + struct nvme_fc_ctrl *ctrl = + container_of(work, struct nvme_fc_ctrl, ctrl.reset_work); + int ret; + + __nvme_fc_terminate_io(ctrl); + + nvme_stop_ctrl(&ctrl->ctrl); + + if (ctrl->rport->remoteport.port_state == FC_OBJSTATE_ONLINE) + ret = nvme_fc_create_association(ctrl); + else + ret = -ENOTCONN; + + if (ret) + nvme_fc_reconnect_or_delete(ctrl, ret); + else + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: controller reset complete\n", + ctrl->cnum); +} + +static void +nvme_fc_connect_err_work(struct work_struct *work) +{ + struct nvme_fc_ctrl *ctrl = + container_of(work, struct nvme_fc_ctrl, err_work); + + __nvme_fc_terminate_io(ctrl); + + atomic_set(&ctrl->err_work_active, 0); + + /* + * Rescheduling the connection after recovering + * from the io error is left to the reconnect work + * item, which is what should have stalled waiting on + * the io that had the error that scheduled this work. + */ +} + +static const struct nvme_ctrl_ops nvme_fc_ctrl_ops = { + .name = "fc", + .module = THIS_MODULE, + .flags = NVME_F_FABRICS, + .reg_read32 = nvmf_reg_read32, + .reg_read64 = nvmf_reg_read64, + .reg_write32 = nvmf_reg_write32, + .free_ctrl = nvme_fc_nvme_ctrl_freed, + .submit_async_event = nvme_fc_submit_async_event, + .delete_ctrl = nvme_fc_delete_ctrl, + .get_address = nvmf_get_address, +}; + +static void +nvme_fc_connect_ctrl_work(struct work_struct *work) +{ + int ret; + + struct nvme_fc_ctrl *ctrl = + container_of(to_delayed_work(work), + struct nvme_fc_ctrl, connect_work); + + ret = nvme_fc_create_association(ctrl); + if (ret) + nvme_fc_reconnect_or_delete(ctrl, ret); + else + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: controller connect complete\n", + ctrl->cnum); +} + + +static const struct blk_mq_ops nvme_fc_admin_mq_ops = { + .queue_rq = nvme_fc_queue_rq, + .complete = nvme_fc_complete_rq, + .init_request = nvme_fc_init_request, + .exit_request = nvme_fc_exit_request, + .init_hctx = nvme_fc_init_admin_hctx, + .timeout = nvme_fc_timeout, +}; + + +/* + * Fails a controller request if it matches an existing controller + * (association) with the same tuple: + * <Host NQN, Host ID, local FC port, remote FC port, SUBSYS NQN> + * + * The ports don't need to be compared as they are intrinsically + * already matched by the port pointers supplied. + */ +static bool +nvme_fc_existing_controller(struct nvme_fc_rport *rport, + struct nvmf_ctrl_options *opts) +{ + struct nvme_fc_ctrl *ctrl; + unsigned long flags; + bool found = false; + + spin_lock_irqsave(&rport->lock, flags); + list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) { + found = nvmf_ctlr_matches_baseopts(&ctrl->ctrl, opts); + if (found) + break; + } + spin_unlock_irqrestore(&rport->lock, flags); + + return found; +} + +static struct nvme_ctrl * +nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, + struct nvme_fc_lport *lport, struct nvme_fc_rport *rport) +{ + struct nvme_fc_ctrl *ctrl; + unsigned long flags; + int ret, idx; + + if (!(rport->remoteport.port_role & + (FC_PORT_ROLE_NVME_DISCOVERY | FC_PORT_ROLE_NVME_TARGET))) { + ret = -EBADR; + goto out_fail; + } + + if (!opts->duplicate_connect && + nvme_fc_existing_controller(rport, opts)) { + ret = -EALREADY; + goto out_fail; + } + + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) { + ret = -ENOMEM; + goto out_fail; + } + + idx = ida_simple_get(&nvme_fc_ctrl_cnt, 0, 0, GFP_KERNEL); + if (idx < 0) { + ret = -ENOSPC; + goto out_free_ctrl; + } + + ctrl->ctrl.opts = opts; + ctrl->ctrl.nr_reconnects = 0; + INIT_LIST_HEAD(&ctrl->ctrl_list); + ctrl->lport = lport; + ctrl->rport = rport; + ctrl->dev = lport->dev; + ctrl->cnum = idx; + ctrl->ioq_live = false; + ctrl->assoc_active = false; + atomic_set(&ctrl->err_work_active, 0); + init_waitqueue_head(&ctrl->ioabort_wait); + + get_device(ctrl->dev); + kref_init(&ctrl->ref); + + INIT_WORK(&ctrl->ctrl.reset_work, nvme_fc_reset_ctrl_work); + INIT_DELAYED_WORK(&ctrl->connect_work, nvme_fc_connect_ctrl_work); + INIT_WORK(&ctrl->err_work, nvme_fc_connect_err_work); + spin_lock_init(&ctrl->lock); + + /* io queue count */ + ctrl->ctrl.queue_count = min_t(unsigned int, + opts->nr_io_queues, + lport->ops->max_hw_queues); + ctrl->ctrl.queue_count++; /* +1 for admin queue */ + + ctrl->ctrl.sqsize = opts->queue_size - 1; + ctrl->ctrl.kato = opts->kato; + ctrl->ctrl.cntlid = 0xffff; + + ret = -ENOMEM; + ctrl->queues = kcalloc(ctrl->ctrl.queue_count, + sizeof(struct nvme_fc_queue), GFP_KERNEL); + if (!ctrl->queues) + goto out_free_ida; + + nvme_fc_init_queue(ctrl, 0); + + memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); + ctrl->admin_tag_set.ops = &nvme_fc_admin_mq_ops; + ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; + ctrl->admin_tag_set.reserved_tags = 2; /* fabric connect + Keep-Alive */ + ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; + ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_fc_fcp_op) + + (SG_CHUNK_SIZE * + sizeof(struct scatterlist)) + + ctrl->lport->ops->fcprqst_priv_sz; + ctrl->admin_tag_set.driver_data = ctrl; + ctrl->admin_tag_set.nr_hw_queues = 1; + ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; + ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; + + ret = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); + if (ret) + goto out_free_queues; + ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; + + ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); + if (IS_ERR(ctrl->ctrl.admin_q)) { + ret = PTR_ERR(ctrl->ctrl.admin_q); + goto out_free_admin_tag_set; + } + + /* + * Would have been nice to init io queues tag set as well. + * However, we require interaction from the controller + * for max io queue count before we can do so. + * Defer this to the connect path. + */ + + ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_fc_ctrl_ops, 0); + if (ret) + goto out_cleanup_admin_q; + + /* at this point, teardown path changes to ref counting on nvme ctrl */ + + spin_lock_irqsave(&rport->lock, flags); + list_add_tail(&ctrl->ctrl_list, &rport->ctrl_list); + spin_unlock_irqrestore(&rport->lock, flags); + + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING) || + !nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { + dev_err(ctrl->ctrl.device, + "NVME-FC{%d}: failed to init ctrl state\n", ctrl->cnum); + goto fail_ctrl; + } + + nvme_get_ctrl(&ctrl->ctrl); + + if (!queue_delayed_work(nvme_wq, &ctrl->connect_work, 0)) { + nvme_put_ctrl(&ctrl->ctrl); + dev_err(ctrl->ctrl.device, + "NVME-FC{%d}: failed to schedule initial connect\n", + ctrl->cnum); + goto fail_ctrl; + } + + flush_delayed_work(&ctrl->connect_work); + + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: new ctrl: NQN \"%s\"\n", + ctrl->cnum, ctrl->ctrl.opts->subsysnqn); + + return &ctrl->ctrl; + +fail_ctrl: + nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING); + cancel_work_sync(&ctrl->ctrl.reset_work); + cancel_work_sync(&ctrl->err_work); + cancel_delayed_work_sync(&ctrl->connect_work); + + ctrl->ctrl.opts = NULL; + + /* initiate nvme ctrl ref counting teardown */ + nvme_uninit_ctrl(&ctrl->ctrl); + + /* Remove core ctrl ref. */ + nvme_put_ctrl(&ctrl->ctrl); + + /* as we're past the point where we transition to the ref + * counting teardown path, if we return a bad pointer here, + * the calling routine, thinking it's prior to the + * transition, will do an rport put. Since the teardown + * path also does a rport put, we do an extra get here to + * so proper order/teardown happens. + */ + nvme_fc_rport_get(rport); + + return ERR_PTR(-EIO); + +out_cleanup_admin_q: + blk_cleanup_queue(ctrl->ctrl.admin_q); +out_free_admin_tag_set: + blk_mq_free_tag_set(&ctrl->admin_tag_set); +out_free_queues: + kfree(ctrl->queues); +out_free_ida: + put_device(ctrl->dev); + ida_simple_remove(&nvme_fc_ctrl_cnt, ctrl->cnum); +out_free_ctrl: + kfree(ctrl); +out_fail: + /* exit via here doesn't follow ctlr ref points */ + return ERR_PTR(ret); +} + + +struct nvmet_fc_traddr { + u64 nn; + u64 pn; +}; + +static int +__nvme_fc_parse_u64(substring_t *sstr, u64 *val) +{ + u64 token64; + + if (match_u64(sstr, &token64)) + return -EINVAL; + *val = token64; + + return 0; +} + +/* + * This routine validates and extracts the WWN's from the TRADDR string. + * As kernel parsers need the 0x to determine number base, universally + * build string to parse with 0x prefix before parsing name strings. + */ +static int +nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen) +{ + char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1]; + substring_t wwn = { name, &name[sizeof(name)-1] }; + int nnoffset, pnoffset; + + /* validate it string one of the 2 allowed formats */ + if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH && + !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) && + !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET], + "pn-0x", NVME_FC_TRADDR_OXNNLEN)) { + nnoffset = NVME_FC_TRADDR_OXNNLEN; + pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET + + NVME_FC_TRADDR_OXNNLEN; + } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH && + !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) && + !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET], + "pn-", NVME_FC_TRADDR_NNLEN))) { + nnoffset = NVME_FC_TRADDR_NNLEN; + pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN; + } else + goto out_einval; + + name[0] = '0'; + name[1] = 'x'; + name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0; + + memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN); + if (__nvme_fc_parse_u64(&wwn, &traddr->nn)) + goto out_einval; + + memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN); + if (__nvme_fc_parse_u64(&wwn, &traddr->pn)) + goto out_einval; + + return 0; + +out_einval: + pr_warn("%s: bad traddr string\n", __func__); + return -EINVAL; +} + +static struct nvme_ctrl * +nvme_fc_create_ctrl(struct device *dev, struct nvmf_ctrl_options *opts) +{ + struct nvme_fc_lport *lport; + struct nvme_fc_rport *rport; + struct nvme_ctrl *ctrl; + struct nvmet_fc_traddr laddr = { 0L, 0L }; + struct nvmet_fc_traddr raddr = { 0L, 0L }; + unsigned long flags; + int ret; + + ret = nvme_fc_parse_traddr(&raddr, opts->traddr, NVMF_TRADDR_SIZE); + if (ret || !raddr.nn || !raddr.pn) + return ERR_PTR(-EINVAL); + + ret = nvme_fc_parse_traddr(&laddr, opts->host_traddr, NVMF_TRADDR_SIZE); + if (ret || !laddr.nn || !laddr.pn) + return ERR_PTR(-EINVAL); + + /* find the host and remote ports to connect together */ + spin_lock_irqsave(&nvme_fc_lock, flags); + list_for_each_entry(lport, &nvme_fc_lport_list, port_list) { + if (lport->localport.node_name != laddr.nn || + lport->localport.port_name != laddr.pn || + lport->localport.port_state != FC_OBJSTATE_ONLINE) + continue; + + list_for_each_entry(rport, &lport->endp_list, endp_list) { + if (rport->remoteport.node_name != raddr.nn || + rport->remoteport.port_name != raddr.pn || + rport->remoteport.port_state != FC_OBJSTATE_ONLINE) + continue; + + /* if fail to get reference fall through. Will error */ + if (!nvme_fc_rport_get(rport)) + break; + + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + ctrl = nvme_fc_init_ctrl(dev, opts, lport, rport); + if (IS_ERR(ctrl)) + nvme_fc_rport_put(rport); + return ctrl; + } + } + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + pr_warn("%s: %s - %s combination not found\n", + __func__, opts->traddr, opts->host_traddr); + return ERR_PTR(-ENOENT); +} + + +static struct nvmf_transport_ops nvme_fc_transport = { + .name = "fc", + .module = THIS_MODULE, + .required_opts = NVMF_OPT_TRADDR | NVMF_OPT_HOST_TRADDR, + .allowed_opts = NVMF_OPT_RECONNECT_DELAY | NVMF_OPT_CTRL_LOSS_TMO, + .create_ctrl = nvme_fc_create_ctrl, +}; + +static int __init nvme_fc_init_module(void) +{ + int ret; + + nvme_fc_wq = alloc_workqueue("nvme_fc_wq", WQ_MEM_RECLAIM, 0); + if (!nvme_fc_wq) + return -ENOMEM; + + /* + * NOTE: + * It is expected that in the future the kernel will combine + * the FC-isms that are currently under scsi and now being + * added to by NVME into a new standalone FC class. The SCSI + * and NVME protocols and their devices would be under this + * new FC class. + * + * As we need something to post FC-specific udev events to, + * specifically for nvme probe events, start by creating the + * new device class. When the new standalone FC class is + * put in place, this code will move to a more generic + * location for the class. + */ + fc_class = class_create(THIS_MODULE, "fc"); + if (IS_ERR(fc_class)) { + pr_err("couldn't register class fc\n"); + ret = PTR_ERR(fc_class); + goto out_destroy_wq; + } + + /* + * Create a device for the FC-centric udev events + */ + fc_udev_device = device_create(fc_class, NULL, MKDEV(0, 0), NULL, + "fc_udev_device"); + if (IS_ERR(fc_udev_device)) { + pr_err("couldn't create fc_udev device!\n"); + ret = PTR_ERR(fc_udev_device); + goto out_destroy_class; + } + + ret = nvmf_register_transport(&nvme_fc_transport); + if (ret) + goto out_destroy_device; + + return 0; + +out_destroy_device: + device_destroy(fc_class, MKDEV(0, 0)); +out_destroy_class: + class_destroy(fc_class); +out_destroy_wq: + destroy_workqueue(nvme_fc_wq); + + return ret; +} + +static void __exit nvme_fc_exit_module(void) +{ + /* sanity check - all lports should be removed */ + if (!list_empty(&nvme_fc_lport_list)) + pr_warn("%s: localport list not empty\n", __func__); + + nvmf_unregister_transport(&nvme_fc_transport); + + ida_destroy(&nvme_fc_local_port_cnt); + ida_destroy(&nvme_fc_ctrl_cnt); + + device_destroy(fc_class, MKDEV(0, 0)); + class_destroy(fc_class); + destroy_workqueue(nvme_fc_wq); +} + +module_init(nvme_fc_init_module); +module_exit(nvme_fc_exit_module); + +MODULE_LICENSE("GPL v2"); diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c new file mode 100644 index 000000000..d10257b9c --- /dev/null +++ b/drivers/nvme/host/lightnvm.c @@ -0,0 +1,1294 @@ +/* + * nvme-lightnvm.c - LightNVM NVMe device + * + * Copyright (C) 2014-2015 IT University of Copenhagen + * Initial release: Matias Bjorling <mb@lightnvm.io> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, + * USA. + * + */ + +#include "nvme.h" + +#include <linux/nvme.h> +#include <linux/bitops.h> +#include <linux/lightnvm.h> +#include <linux/vmalloc.h> +#include <linux/sched/sysctl.h> +#include <uapi/linux/lightnvm.h> + +enum nvme_nvm_admin_opcode { + nvme_nvm_admin_identity = 0xe2, + nvme_nvm_admin_get_bb_tbl = 0xf2, + nvme_nvm_admin_set_bb_tbl = 0xf1, +}; + +enum nvme_nvm_log_page { + NVME_NVM_LOG_REPORT_CHUNK = 0xca, +}; + +struct nvme_nvm_ph_rw { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd2; + __le64 metadata; + __le64 prp1; + __le64 prp2; + __le64 spba; + __le16 length; + __le16 control; + __le32 dsmgmt; + __le64 resv; +}; + +struct nvme_nvm_erase_blk { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd[2]; + __le64 prp1; + __le64 prp2; + __le64 spba; + __le16 length; + __le16 control; + __le32 dsmgmt; + __le64 resv; +}; + +struct nvme_nvm_identity { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd[2]; + __le64 prp1; + __le64 prp2; + __u32 rsvd11[6]; +}; + +struct nvme_nvm_getbbtbl { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd[2]; + __le64 prp1; + __le64 prp2; + __le64 spba; + __u32 rsvd4[4]; +}; + +struct nvme_nvm_setbbtbl { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __le64 rsvd[2]; + __le64 prp1; + __le64 prp2; + __le64 spba; + __le16 nlb; + __u8 value; + __u8 rsvd3; + __u32 rsvd4[3]; +}; + +struct nvme_nvm_command { + union { + struct nvme_common_command common; + struct nvme_nvm_ph_rw ph_rw; + struct nvme_nvm_erase_blk erase; + struct nvme_nvm_identity identity; + struct nvme_nvm_getbbtbl get_bb; + struct nvme_nvm_setbbtbl set_bb; + }; +}; + +struct nvme_nvm_id12_grp { + __u8 mtype; + __u8 fmtype; + __le16 res16; + __u8 num_ch; + __u8 num_lun; + __u8 num_pln; + __u8 rsvd1; + __le16 num_chk; + __le16 num_pg; + __le16 fpg_sz; + __le16 csecs; + __le16 sos; + __le16 rsvd2; + __le32 trdt; + __le32 trdm; + __le32 tprt; + __le32 tprm; + __le32 tbet; + __le32 tbem; + __le32 mpos; + __le32 mccap; + __le16 cpar; + __u8 reserved[906]; +} __packed; + +struct nvme_nvm_id12_addrf { + __u8 ch_offset; + __u8 ch_len; + __u8 lun_offset; + __u8 lun_len; + __u8 pln_offset; + __u8 pln_len; + __u8 blk_offset; + __u8 blk_len; + __u8 pg_offset; + __u8 pg_len; + __u8 sec_offset; + __u8 sec_len; + __u8 res[4]; +} __packed; + +struct nvme_nvm_id12 { + __u8 ver_id; + __u8 vmnt; + __u8 cgrps; + __u8 res; + __le32 cap; + __le32 dom; + struct nvme_nvm_id12_addrf ppaf; + __u8 resv[228]; + struct nvme_nvm_id12_grp grp; + __u8 resv2[2880]; +} __packed; + +struct nvme_nvm_bb_tbl { + __u8 tblid[4]; + __le16 verid; + __le16 revid; + __le32 rvsd1; + __le32 tblks; + __le32 tfact; + __le32 tgrown; + __le32 tdresv; + __le32 thresv; + __le32 rsvd2[8]; + __u8 blk[0]; +}; + +struct nvme_nvm_id20_addrf { + __u8 grp_len; + __u8 pu_len; + __u8 chk_len; + __u8 lba_len; + __u8 resv[4]; +}; + +struct nvme_nvm_id20 { + __u8 mjr; + __u8 mnr; + __u8 resv[6]; + + struct nvme_nvm_id20_addrf lbaf; + + __le32 mccap; + __u8 resv2[12]; + + __u8 wit; + __u8 resv3[31]; + + /* Geometry */ + __le16 num_grp; + __le16 num_pu; + __le32 num_chk; + __le32 clba; + __u8 resv4[52]; + + /* Write data requirements */ + __le32 ws_min; + __le32 ws_opt; + __le32 mw_cunits; + __le32 maxoc; + __le32 maxocpu; + __u8 resv5[44]; + + /* Performance related metrics */ + __le32 trdt; + __le32 trdm; + __le32 twrt; + __le32 twrm; + __le32 tcrst; + __le32 tcrsm; + __u8 resv6[40]; + + /* Reserved area */ + __u8 resv7[2816]; + + /* Vendor specific */ + __u8 vs[1024]; +}; + +struct nvme_nvm_chk_meta { + __u8 state; + __u8 type; + __u8 wi; + __u8 rsvd[5]; + __le64 slba; + __le64 cnlb; + __le64 wp; +}; + +/* + * Check we didn't inadvertently grow the command struct + */ +static inline void _nvme_nvm_check_size(void) +{ + BUILD_BUG_ON(sizeof(struct nvme_nvm_identity) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_ph_rw) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_erase_blk) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_getbbtbl) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_setbbtbl) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_id12_grp) != 960); + BUILD_BUG_ON(sizeof(struct nvme_nvm_id12_addrf) != 16); + BUILD_BUG_ON(sizeof(struct nvme_nvm_id12) != NVME_IDENTIFY_DATA_SIZE); + BUILD_BUG_ON(sizeof(struct nvme_nvm_bb_tbl) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_id20_addrf) != 8); + BUILD_BUG_ON(sizeof(struct nvme_nvm_id20) != NVME_IDENTIFY_DATA_SIZE); + BUILD_BUG_ON(sizeof(struct nvme_nvm_chk_meta) != 32); + BUILD_BUG_ON(sizeof(struct nvme_nvm_chk_meta) != + sizeof(struct nvm_chk_meta)); +} + +static void nvme_nvm_set_addr_12(struct nvm_addrf_12 *dst, + struct nvme_nvm_id12_addrf *src) +{ + dst->ch_len = src->ch_len; + dst->lun_len = src->lun_len; + dst->blk_len = src->blk_len; + dst->pg_len = src->pg_len; + dst->pln_len = src->pln_len; + dst->sec_len = src->sec_len; + + dst->ch_offset = src->ch_offset; + dst->lun_offset = src->lun_offset; + dst->blk_offset = src->blk_offset; + dst->pg_offset = src->pg_offset; + dst->pln_offset = src->pln_offset; + dst->sec_offset = src->sec_offset; + + dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset; + dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset; + dst->blk_mask = ((1ULL << dst->blk_len) - 1) << dst->blk_offset; + dst->pg_mask = ((1ULL << dst->pg_len) - 1) << dst->pg_offset; + dst->pln_mask = ((1ULL << dst->pln_len) - 1) << dst->pln_offset; + dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset; +} + +static int nvme_nvm_setup_12(struct nvme_nvm_id12 *id, + struct nvm_geo *geo) +{ + struct nvme_nvm_id12_grp *src; + int sec_per_pg, sec_per_pl, pg_per_blk; + + if (id->cgrps != 1) + return -EINVAL; + + src = &id->grp; + + if (src->mtype != 0) { + pr_err("nvm: memory type not supported\n"); + return -EINVAL; + } + + /* 1.2 spec. only reports a single version id - unfold */ + geo->major_ver_id = id->ver_id; + geo->minor_ver_id = 2; + + /* Set compacted version for upper layers */ + geo->version = NVM_OCSSD_SPEC_12; + + geo->num_ch = src->num_ch; + geo->num_lun = src->num_lun; + geo->all_luns = geo->num_ch * geo->num_lun; + + geo->num_chk = le16_to_cpu(src->num_chk); + + geo->csecs = le16_to_cpu(src->csecs); + geo->sos = le16_to_cpu(src->sos); + + pg_per_blk = le16_to_cpu(src->num_pg); + sec_per_pg = le16_to_cpu(src->fpg_sz) / geo->csecs; + sec_per_pl = sec_per_pg * src->num_pln; + geo->clba = sec_per_pl * pg_per_blk; + + geo->all_chunks = geo->all_luns * geo->num_chk; + geo->total_secs = geo->clba * geo->all_chunks; + + geo->ws_min = sec_per_pg; + geo->ws_opt = sec_per_pg; + geo->mw_cunits = geo->ws_opt << 3; /* default to MLC safe values */ + + /* Do not impose values for maximum number of open blocks as it is + * unspecified in 1.2. Users of 1.2 must be aware of this and eventually + * specify these values through a quirk if restrictions apply. + */ + geo->maxoc = geo->all_luns * geo->num_chk; + geo->maxocpu = geo->num_chk; + + geo->mccap = le32_to_cpu(src->mccap); + + geo->trdt = le32_to_cpu(src->trdt); + geo->trdm = le32_to_cpu(src->trdm); + geo->tprt = le32_to_cpu(src->tprt); + geo->tprm = le32_to_cpu(src->tprm); + geo->tbet = le32_to_cpu(src->tbet); + geo->tbem = le32_to_cpu(src->tbem); + + /* 1.2 compatibility */ + geo->vmnt = id->vmnt; + geo->cap = le32_to_cpu(id->cap); + geo->dom = le32_to_cpu(id->dom); + + geo->mtype = src->mtype; + geo->fmtype = src->fmtype; + + geo->cpar = le16_to_cpu(src->cpar); + geo->mpos = le32_to_cpu(src->mpos); + + geo->pln_mode = NVM_PLANE_SINGLE; + + if (geo->mpos & 0x020202) { + geo->pln_mode = NVM_PLANE_DOUBLE; + geo->ws_opt <<= 1; + } else if (geo->mpos & 0x040404) { + geo->pln_mode = NVM_PLANE_QUAD; + geo->ws_opt <<= 2; + } + + geo->num_pln = src->num_pln; + geo->num_pg = le16_to_cpu(src->num_pg); + geo->fpg_sz = le16_to_cpu(src->fpg_sz); + + nvme_nvm_set_addr_12((struct nvm_addrf_12 *)&geo->addrf, &id->ppaf); + + return 0; +} + +static void nvme_nvm_set_addr_20(struct nvm_addrf *dst, + struct nvme_nvm_id20_addrf *src) +{ + dst->ch_len = src->grp_len; + dst->lun_len = src->pu_len; + dst->chk_len = src->chk_len; + dst->sec_len = src->lba_len; + + dst->sec_offset = 0; + dst->chk_offset = dst->sec_len; + dst->lun_offset = dst->chk_offset + dst->chk_len; + dst->ch_offset = dst->lun_offset + dst->lun_len; + + dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset; + dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset; + dst->chk_mask = ((1ULL << dst->chk_len) - 1) << dst->chk_offset; + dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset; +} + +static int nvme_nvm_setup_20(struct nvme_nvm_id20 *id, + struct nvm_geo *geo) +{ + geo->major_ver_id = id->mjr; + geo->minor_ver_id = id->mnr; + + /* Set compacted version for upper layers */ + geo->version = NVM_OCSSD_SPEC_20; + + geo->num_ch = le16_to_cpu(id->num_grp); + geo->num_lun = le16_to_cpu(id->num_pu); + geo->all_luns = geo->num_ch * geo->num_lun; + + geo->num_chk = le32_to_cpu(id->num_chk); + geo->clba = le32_to_cpu(id->clba); + + geo->all_chunks = geo->all_luns * geo->num_chk; + geo->total_secs = geo->clba * geo->all_chunks; + + geo->ws_min = le32_to_cpu(id->ws_min); + geo->ws_opt = le32_to_cpu(id->ws_opt); + geo->mw_cunits = le32_to_cpu(id->mw_cunits); + geo->maxoc = le32_to_cpu(id->maxoc); + geo->maxocpu = le32_to_cpu(id->maxocpu); + + geo->trdt = le32_to_cpu(id->trdt); + geo->trdm = le32_to_cpu(id->trdm); + geo->tprt = le32_to_cpu(id->twrt); + geo->tprm = le32_to_cpu(id->twrm); + geo->tbet = le32_to_cpu(id->tcrst); + geo->tbem = le32_to_cpu(id->tcrsm); + + nvme_nvm_set_addr_20(&geo->addrf, &id->lbaf); + + return 0; +} + +static int nvme_nvm_identity(struct nvm_dev *nvmdev) +{ + struct nvme_ns *ns = nvmdev->q->queuedata; + struct nvme_nvm_id12 *id; + struct nvme_nvm_command c = {}; + int ret; + + c.identity.opcode = nvme_nvm_admin_identity; + c.identity.nsid = cpu_to_le32(ns->head->ns_id); + + id = kmalloc(sizeof(struct nvme_nvm_id12), GFP_KERNEL); + if (!id) + return -ENOMEM; + + ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, (struct nvme_command *)&c, + id, sizeof(struct nvme_nvm_id12)); + if (ret) { + ret = -EIO; + goto out; + } + + /* + * The 1.2 and 2.0 specifications share the first byte in their geometry + * command to make it possible to know what version a device implements. + */ + switch (id->ver_id) { + case 1: + ret = nvme_nvm_setup_12(id, &nvmdev->geo); + break; + case 2: + ret = nvme_nvm_setup_20((struct nvme_nvm_id20 *)id, + &nvmdev->geo); + break; + default: + dev_err(ns->ctrl->device, "OCSSD revision not supported (%d)\n", + id->ver_id); + ret = -EINVAL; + } + +out: + kfree(id); + return ret; +} + +static int nvme_nvm_get_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr ppa, + u8 *blks) +{ + struct request_queue *q = nvmdev->q; + struct nvm_geo *geo = &nvmdev->geo; + struct nvme_ns *ns = q->queuedata; + struct nvme_ctrl *ctrl = ns->ctrl; + struct nvme_nvm_command c = {}; + struct nvme_nvm_bb_tbl *bb_tbl; + int nr_blks = geo->num_chk * geo->num_pln; + int tblsz = sizeof(struct nvme_nvm_bb_tbl) + nr_blks; + int ret = 0; + + c.get_bb.opcode = nvme_nvm_admin_get_bb_tbl; + c.get_bb.nsid = cpu_to_le32(ns->head->ns_id); + c.get_bb.spba = cpu_to_le64(ppa.ppa); + + bb_tbl = kzalloc(tblsz, GFP_KERNEL); + if (!bb_tbl) + return -ENOMEM; + + ret = nvme_submit_sync_cmd(ctrl->admin_q, (struct nvme_command *)&c, + bb_tbl, tblsz); + if (ret) { + dev_err(ctrl->device, "get bad block table failed (%d)\n", ret); + ret = -EIO; + goto out; + } + + if (bb_tbl->tblid[0] != 'B' || bb_tbl->tblid[1] != 'B' || + bb_tbl->tblid[2] != 'L' || bb_tbl->tblid[3] != 'T') { + dev_err(ctrl->device, "bbt format mismatch\n"); + ret = -EINVAL; + goto out; + } + + if (le16_to_cpu(bb_tbl->verid) != 1) { + ret = -EINVAL; + dev_err(ctrl->device, "bbt version not supported\n"); + goto out; + } + + if (le32_to_cpu(bb_tbl->tblks) != nr_blks) { + ret = -EINVAL; + dev_err(ctrl->device, + "bbt unsuspected blocks returned (%u!=%u)", + le32_to_cpu(bb_tbl->tblks), nr_blks); + goto out; + } + + memcpy(blks, bb_tbl->blk, geo->num_chk * geo->num_pln); +out: + kfree(bb_tbl); + return ret; +} + +static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr *ppas, + int nr_ppas, int type) +{ + struct nvme_ns *ns = nvmdev->q->queuedata; + struct nvme_nvm_command c = {}; + int ret = 0; + + c.set_bb.opcode = nvme_nvm_admin_set_bb_tbl; + c.set_bb.nsid = cpu_to_le32(ns->head->ns_id); + c.set_bb.spba = cpu_to_le64(ppas->ppa); + c.set_bb.nlb = cpu_to_le16(nr_ppas - 1); + c.set_bb.value = type; + + ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, (struct nvme_command *)&c, + NULL, 0); + if (ret) + dev_err(ns->ctrl->device, "set bad block table failed (%d)\n", + ret); + return ret; +} + +/* + * Expect the lba in device format + */ +static int nvme_nvm_get_chk_meta(struct nvm_dev *ndev, + struct nvm_chk_meta *meta, + sector_t slba, int nchks) +{ + struct nvm_geo *geo = &ndev->geo; + struct nvme_ns *ns = ndev->q->queuedata; + struct nvme_ctrl *ctrl = ns->ctrl; + struct nvme_nvm_chk_meta *dev_meta = (struct nvme_nvm_chk_meta *)meta; + struct ppa_addr ppa; + size_t left = nchks * sizeof(struct nvme_nvm_chk_meta); + size_t log_pos, offset, len; + int ret, i, max_len; + + /* + * limit requests to maximum 256K to avoid issuing arbitrary large + * requests when the device does not specific a maximum transfer size. + */ + max_len = min_t(unsigned int, ctrl->max_hw_sectors << 9, 256 * 1024); + + /* Normalize lba address space to obtain log offset */ + ppa.ppa = slba; + ppa = dev_to_generic_addr(ndev, ppa); + + log_pos = ppa.m.chk; + log_pos += ppa.m.pu * geo->num_chk; + log_pos += ppa.m.grp * geo->num_lun * geo->num_chk; + + offset = log_pos * sizeof(struct nvme_nvm_chk_meta); + + while (left) { + len = min_t(unsigned int, left, max_len); + + ret = nvme_get_log(ctrl, ns->head->ns_id, + NVME_NVM_LOG_REPORT_CHUNK, 0, dev_meta, len, + offset); + if (ret) { + dev_err(ctrl->device, "Get REPORT CHUNK log error\n"); + break; + } + + for (i = 0; i < len; i += sizeof(struct nvme_nvm_chk_meta)) { + meta->state = dev_meta->state; + meta->type = dev_meta->type; + meta->wi = dev_meta->wi; + meta->slba = le64_to_cpu(dev_meta->slba); + meta->cnlb = le64_to_cpu(dev_meta->cnlb); + meta->wp = le64_to_cpu(dev_meta->wp); + + meta++; + dev_meta++; + } + + offset += len; + left -= len; + } + + return ret; +} + +static inline void nvme_nvm_rqtocmd(struct nvm_rq *rqd, struct nvme_ns *ns, + struct nvme_nvm_command *c) +{ + c->ph_rw.opcode = rqd->opcode; + c->ph_rw.nsid = cpu_to_le32(ns->head->ns_id); + c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa); + c->ph_rw.metadata = cpu_to_le64(rqd->dma_meta_list); + c->ph_rw.control = cpu_to_le16(rqd->flags); + c->ph_rw.length = cpu_to_le16(rqd->nr_ppas - 1); +} + +static void nvme_nvm_end_io(struct request *rq, blk_status_t status) +{ + struct nvm_rq *rqd = rq->end_io_data; + + rqd->ppa_status = le64_to_cpu(nvme_req(rq)->result.u64); + rqd->error = nvme_req(rq)->status; + nvm_end_io(rqd); + + kfree(nvme_req(rq)->cmd); + blk_mq_free_request(rq); +} + +static struct request *nvme_nvm_alloc_request(struct request_queue *q, + struct nvm_rq *rqd, + struct nvme_nvm_command *cmd) +{ + struct nvme_ns *ns = q->queuedata; + struct request *rq; + + nvme_nvm_rqtocmd(rqd, ns, cmd); + + rq = nvme_alloc_request(q, (struct nvme_command *)cmd, 0, NVME_QID_ANY); + if (IS_ERR(rq)) + return rq; + + rq->cmd_flags &= ~REQ_FAILFAST_DRIVER; + + if (rqd->bio) + blk_init_request_from_bio(rq, rqd->bio); + else + rq->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, IOPRIO_NORM); + + return rq; +} + +static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) +{ + struct request_queue *q = dev->q; + struct nvme_nvm_command *cmd; + struct request *rq; + + cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL); + if (!cmd) + return -ENOMEM; + + rq = nvme_nvm_alloc_request(q, rqd, cmd); + if (IS_ERR(rq)) { + kfree(cmd); + return PTR_ERR(rq); + } + + rq->end_io_data = rqd; + + blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io); + + return 0; +} + +static int nvme_nvm_submit_io_sync(struct nvm_dev *dev, struct nvm_rq *rqd) +{ + struct request_queue *q = dev->q; + struct request *rq; + struct nvme_nvm_command cmd; + int ret = 0; + + memset(&cmd, 0, sizeof(struct nvme_nvm_command)); + + rq = nvme_nvm_alloc_request(q, rqd, &cmd); + if (IS_ERR(rq)) + return PTR_ERR(rq); + + /* I/Os can fail and the error is signaled through rqd. Callers must + * handle the error accordingly. + */ + blk_execute_rq(q, NULL, rq, 0); + if (nvme_req(rq)->flags & NVME_REQ_CANCELLED) + ret = -EINTR; + + rqd->ppa_status = le64_to_cpu(nvme_req(rq)->result.u64); + rqd->error = nvme_req(rq)->status; + + blk_mq_free_request(rq); + + return ret; +} + +static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name) +{ + struct nvme_ns *ns = nvmdev->q->queuedata; + + return dma_pool_create(name, ns->ctrl->dev, PAGE_SIZE, PAGE_SIZE, 0); +} + +static void nvme_nvm_destroy_dma_pool(void *pool) +{ + struct dma_pool *dma_pool = pool; + + dma_pool_destroy(dma_pool); +} + +static void *nvme_nvm_dev_dma_alloc(struct nvm_dev *dev, void *pool, + gfp_t mem_flags, dma_addr_t *dma_handler) +{ + return dma_pool_alloc(pool, mem_flags, dma_handler); +} + +static void nvme_nvm_dev_dma_free(void *pool, void *addr, + dma_addr_t dma_handler) +{ + dma_pool_free(pool, addr, dma_handler); +} + +static struct nvm_dev_ops nvme_nvm_dev_ops = { + .identity = nvme_nvm_identity, + + .get_bb_tbl = nvme_nvm_get_bb_tbl, + .set_bb_tbl = nvme_nvm_set_bb_tbl, + + .get_chk_meta = nvme_nvm_get_chk_meta, + + .submit_io = nvme_nvm_submit_io, + .submit_io_sync = nvme_nvm_submit_io_sync, + + .create_dma_pool = nvme_nvm_create_dma_pool, + .destroy_dma_pool = nvme_nvm_destroy_dma_pool, + .dev_dma_alloc = nvme_nvm_dev_dma_alloc, + .dev_dma_free = nvme_nvm_dev_dma_free, +}; + +static int nvme_nvm_submit_user_cmd(struct request_queue *q, + struct nvme_ns *ns, + struct nvme_nvm_command *vcmd, + void __user *ubuf, unsigned int bufflen, + void __user *meta_buf, unsigned int meta_len, + void __user *ppa_buf, unsigned int ppa_len, + u32 *result, u64 *status, unsigned int timeout) +{ + bool write = nvme_is_write((struct nvme_command *)vcmd); + struct nvm_dev *dev = ns->ndev; + struct gendisk *disk = ns->disk; + struct request *rq; + struct bio *bio = NULL; + __le64 *ppa_list = NULL; + dma_addr_t ppa_dma; + __le64 *metadata = NULL; + dma_addr_t metadata_dma; + DECLARE_COMPLETION_ONSTACK(wait); + int ret = 0; + + rq = nvme_alloc_request(q, (struct nvme_command *)vcmd, 0, + NVME_QID_ANY); + if (IS_ERR(rq)) { + ret = -ENOMEM; + goto err_cmd; + } + + rq->timeout = timeout ? timeout : ADMIN_TIMEOUT; + + if (ppa_buf && ppa_len) { + ppa_list = dma_pool_alloc(dev->dma_pool, GFP_KERNEL, &ppa_dma); + if (!ppa_list) { + ret = -ENOMEM; + goto err_rq; + } + if (copy_from_user(ppa_list, (void __user *)ppa_buf, + sizeof(u64) * (ppa_len + 1))) { + ret = -EFAULT; + goto err_ppa; + } + vcmd->ph_rw.spba = cpu_to_le64(ppa_dma); + } else { + vcmd->ph_rw.spba = cpu_to_le64((uintptr_t)ppa_buf); + } + + if (ubuf && bufflen) { + ret = blk_rq_map_user(q, rq, NULL, ubuf, bufflen, GFP_KERNEL); + if (ret) + goto err_ppa; + bio = rq->bio; + + if (meta_buf && meta_len) { + metadata = dma_pool_alloc(dev->dma_pool, GFP_KERNEL, + &metadata_dma); + if (!metadata) { + ret = -ENOMEM; + goto err_map; + } + + if (write) { + if (copy_from_user(metadata, + (void __user *)meta_buf, + meta_len)) { + ret = -EFAULT; + goto err_meta; + } + } + vcmd->ph_rw.metadata = cpu_to_le64(metadata_dma); + } + + bio->bi_disk = disk; + } + + blk_execute_rq(q, NULL, rq, 0); + + if (nvme_req(rq)->flags & NVME_REQ_CANCELLED) + ret = -EINTR; + else if (nvme_req(rq)->status & 0x7ff) + ret = -EIO; + if (result) + *result = nvme_req(rq)->status & 0x7ff; + if (status) + *status = le64_to_cpu(nvme_req(rq)->result.u64); + + if (metadata && !ret && !write) { + if (copy_to_user(meta_buf, (void *)metadata, meta_len)) + ret = -EFAULT; + } +err_meta: + if (meta_buf && meta_len) + dma_pool_free(dev->dma_pool, metadata, metadata_dma); +err_map: + if (bio) + blk_rq_unmap_user(bio); +err_ppa: + if (ppa_buf && ppa_len) + dma_pool_free(dev->dma_pool, ppa_list, ppa_dma); +err_rq: + blk_mq_free_request(rq); +err_cmd: + return ret; +} + +static int nvme_nvm_submit_vio(struct nvme_ns *ns, + struct nvm_user_vio __user *uvio) +{ + struct nvm_user_vio vio; + struct nvme_nvm_command c; + unsigned int length; + int ret; + + if (copy_from_user(&vio, uvio, sizeof(vio))) + return -EFAULT; + if (vio.flags) + return -EINVAL; + + memset(&c, 0, sizeof(c)); + c.ph_rw.opcode = vio.opcode; + c.ph_rw.nsid = cpu_to_le32(ns->head->ns_id); + c.ph_rw.control = cpu_to_le16(vio.control); + c.ph_rw.length = cpu_to_le16(vio.nppas); + + length = (vio.nppas + 1) << ns->lba_shift; + + ret = nvme_nvm_submit_user_cmd(ns->queue, ns, &c, + (void __user *)(uintptr_t)vio.addr, length, + (void __user *)(uintptr_t)vio.metadata, + vio.metadata_len, + (void __user *)(uintptr_t)vio.ppa_list, vio.nppas, + &vio.result, &vio.status, 0); + + if (ret && copy_to_user(uvio, &vio, sizeof(vio))) + return -EFAULT; + + return ret; +} + +static int nvme_nvm_user_vcmd(struct nvme_ns *ns, int admin, + struct nvm_passthru_vio __user *uvcmd) +{ + struct nvm_passthru_vio vcmd; + struct nvme_nvm_command c; + struct request_queue *q; + unsigned int timeout = 0; + int ret; + + if (copy_from_user(&vcmd, uvcmd, sizeof(vcmd))) + return -EFAULT; + if ((vcmd.opcode != 0xF2) && (!capable(CAP_SYS_ADMIN))) + return -EACCES; + if (vcmd.flags) + return -EINVAL; + + memset(&c, 0, sizeof(c)); + c.common.opcode = vcmd.opcode; + c.common.nsid = cpu_to_le32(ns->head->ns_id); + c.common.cdw2[0] = cpu_to_le32(vcmd.cdw2); + c.common.cdw2[1] = cpu_to_le32(vcmd.cdw3); + /* cdw11-12 */ + c.ph_rw.length = cpu_to_le16(vcmd.nppas); + c.ph_rw.control = cpu_to_le16(vcmd.control); + c.common.cdw10[3] = cpu_to_le32(vcmd.cdw13); + c.common.cdw10[4] = cpu_to_le32(vcmd.cdw14); + c.common.cdw10[5] = cpu_to_le32(vcmd.cdw15); + + if (vcmd.timeout_ms) + timeout = msecs_to_jiffies(vcmd.timeout_ms); + + q = admin ? ns->ctrl->admin_q : ns->queue; + + ret = nvme_nvm_submit_user_cmd(q, ns, + (struct nvme_nvm_command *)&c, + (void __user *)(uintptr_t)vcmd.addr, vcmd.data_len, + (void __user *)(uintptr_t)vcmd.metadata, + vcmd.metadata_len, + (void __user *)(uintptr_t)vcmd.ppa_list, vcmd.nppas, + &vcmd.result, &vcmd.status, timeout); + + if (ret && copy_to_user(uvcmd, &vcmd, sizeof(vcmd))) + return -EFAULT; + + return ret; +} + +int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case NVME_NVM_IOCTL_ADMIN_VIO: + return nvme_nvm_user_vcmd(ns, 1, (void __user *)arg); + case NVME_NVM_IOCTL_IO_VIO: + return nvme_nvm_user_vcmd(ns, 0, (void __user *)arg); + case NVME_NVM_IOCTL_SUBMIT_VIO: + return nvme_nvm_submit_vio(ns, (void __user *)arg); + default: + return -ENOTTY; + } +} + +void nvme_nvm_update_nvm_info(struct nvme_ns *ns) +{ + struct nvm_dev *ndev = ns->ndev; + struct nvm_geo *geo = &ndev->geo; + + if (geo->version == NVM_OCSSD_SPEC_12) + return; + + geo->csecs = 1 << ns->lba_shift; + geo->sos = ns->ms; +} + +int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node) +{ + struct request_queue *q = ns->queue; + struct nvm_dev *dev; + + _nvme_nvm_check_size(); + + dev = nvm_alloc_dev(node); + if (!dev) + return -ENOMEM; + + dev->q = q; + memcpy(dev->name, disk_name, DISK_NAME_LEN); + dev->ops = &nvme_nvm_dev_ops; + dev->private_data = ns; + ns->ndev = dev; + + return nvm_register(dev); +} + +void nvme_nvm_unregister(struct nvme_ns *ns) +{ + nvm_unregister(ns->ndev); +} + +static ssize_t nvm_dev_attr_show(struct device *dev, + struct device_attribute *dattr, char *page) +{ + struct nvme_ns *ns = nvme_get_ns_from_dev(dev); + struct nvm_dev *ndev = ns->ndev; + struct nvm_geo *geo = &ndev->geo; + struct attribute *attr; + + if (!ndev) + return 0; + + attr = &dattr->attr; + + if (strcmp(attr->name, "version") == 0) { + if (geo->major_ver_id == 1) + return scnprintf(page, PAGE_SIZE, "%u\n", + geo->major_ver_id); + else + return scnprintf(page, PAGE_SIZE, "%u.%u\n", + geo->major_ver_id, + geo->minor_ver_id); + } else if (strcmp(attr->name, "capabilities") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->cap); + } else if (strcmp(attr->name, "read_typ") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->trdt); + } else if (strcmp(attr->name, "read_max") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->trdm); + } else { + return scnprintf(page, + PAGE_SIZE, + "Unhandled attr(%s) in `%s`\n", + attr->name, __func__); + } +} + +static ssize_t nvm_dev_attr_show_ppaf(struct nvm_addrf_12 *ppaf, char *page) +{ + return scnprintf(page, PAGE_SIZE, + "0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", + ppaf->ch_offset, ppaf->ch_len, + ppaf->lun_offset, ppaf->lun_len, + ppaf->pln_offset, ppaf->pln_len, + ppaf->blk_offset, ppaf->blk_len, + ppaf->pg_offset, ppaf->pg_len, + ppaf->sec_offset, ppaf->sec_len); +} + +static ssize_t nvm_dev_attr_show_12(struct device *dev, + struct device_attribute *dattr, char *page) +{ + struct nvme_ns *ns = nvme_get_ns_from_dev(dev); + struct nvm_dev *ndev = ns->ndev; + struct nvm_geo *geo = &ndev->geo; + struct attribute *attr; + + if (!ndev) + return 0; + + attr = &dattr->attr; + + if (strcmp(attr->name, "vendor_opcode") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->vmnt); + } else if (strcmp(attr->name, "device_mode") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->dom); + /* kept for compatibility */ + } else if (strcmp(attr->name, "media_manager") == 0) { + return scnprintf(page, PAGE_SIZE, "%s\n", "gennvm"); + } else if (strcmp(attr->name, "ppa_format") == 0) { + return nvm_dev_attr_show_ppaf((void *)&geo->addrf, page); + } else if (strcmp(attr->name, "media_type") == 0) { /* u8 */ + return scnprintf(page, PAGE_SIZE, "%u\n", geo->mtype); + } else if (strcmp(attr->name, "flash_media_type") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->fmtype); + } else if (strcmp(attr->name, "num_channels") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_ch); + } else if (strcmp(attr->name, "num_luns") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_lun); + } else if (strcmp(attr->name, "num_planes") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_pln); + } else if (strcmp(attr->name, "num_blocks") == 0) { /* u16 */ + return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_chk); + } else if (strcmp(attr->name, "num_pages") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_pg); + } else if (strcmp(attr->name, "page_size") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->fpg_sz); + } else if (strcmp(attr->name, "hw_sector_size") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->csecs); + } else if (strcmp(attr->name, "oob_sector_size") == 0) {/* u32 */ + return scnprintf(page, PAGE_SIZE, "%u\n", geo->sos); + } else if (strcmp(attr->name, "prog_typ") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->tprt); + } else if (strcmp(attr->name, "prog_max") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->tprm); + } else if (strcmp(attr->name, "erase_typ") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->tbet); + } else if (strcmp(attr->name, "erase_max") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->tbem); + } else if (strcmp(attr->name, "multiplane_modes") == 0) { + return scnprintf(page, PAGE_SIZE, "0x%08x\n", geo->mpos); + } else if (strcmp(attr->name, "media_capabilities") == 0) { + return scnprintf(page, PAGE_SIZE, "0x%08x\n", geo->mccap); + } else if (strcmp(attr->name, "max_phys_secs") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", NVM_MAX_VLBA); + } else { + return scnprintf(page, PAGE_SIZE, + "Unhandled attr(%s) in `%s`\n", + attr->name, __func__); + } +} + +static ssize_t nvm_dev_attr_show_20(struct device *dev, + struct device_attribute *dattr, char *page) +{ + struct nvme_ns *ns = nvme_get_ns_from_dev(dev); + struct nvm_dev *ndev = ns->ndev; + struct nvm_geo *geo = &ndev->geo; + struct attribute *attr; + + if (!ndev) + return 0; + + attr = &dattr->attr; + + if (strcmp(attr->name, "groups") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_ch); + } else if (strcmp(attr->name, "punits") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_lun); + } else if (strcmp(attr->name, "chunks") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_chk); + } else if (strcmp(attr->name, "clba") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->clba); + } else if (strcmp(attr->name, "ws_min") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->ws_min); + } else if (strcmp(attr->name, "ws_opt") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->ws_opt); + } else if (strcmp(attr->name, "maxoc") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->maxoc); + } else if (strcmp(attr->name, "maxocpu") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->maxocpu); + } else if (strcmp(attr->name, "mw_cunits") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->mw_cunits); + } else if (strcmp(attr->name, "write_typ") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->tprt); + } else if (strcmp(attr->name, "write_max") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->tprm); + } else if (strcmp(attr->name, "reset_typ") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->tbet); + } else if (strcmp(attr->name, "reset_max") == 0) { + return scnprintf(page, PAGE_SIZE, "%u\n", geo->tbem); + } else { + return scnprintf(page, PAGE_SIZE, + "Unhandled attr(%s) in `%s`\n", + attr->name, __func__); + } +} + +#define NVM_DEV_ATTR_RO(_name) \ + DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show, NULL) +#define NVM_DEV_ATTR_12_RO(_name) \ + DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show_12, NULL) +#define NVM_DEV_ATTR_20_RO(_name) \ + DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show_20, NULL) + +/* general attributes */ +static NVM_DEV_ATTR_RO(version); +static NVM_DEV_ATTR_RO(capabilities); + +static NVM_DEV_ATTR_RO(read_typ); +static NVM_DEV_ATTR_RO(read_max); + +/* 1.2 values */ +static NVM_DEV_ATTR_12_RO(vendor_opcode); +static NVM_DEV_ATTR_12_RO(device_mode); +static NVM_DEV_ATTR_12_RO(ppa_format); +static NVM_DEV_ATTR_12_RO(media_manager); +static NVM_DEV_ATTR_12_RO(media_type); +static NVM_DEV_ATTR_12_RO(flash_media_type); +static NVM_DEV_ATTR_12_RO(num_channels); +static NVM_DEV_ATTR_12_RO(num_luns); +static NVM_DEV_ATTR_12_RO(num_planes); +static NVM_DEV_ATTR_12_RO(num_blocks); +static NVM_DEV_ATTR_12_RO(num_pages); +static NVM_DEV_ATTR_12_RO(page_size); +static NVM_DEV_ATTR_12_RO(hw_sector_size); +static NVM_DEV_ATTR_12_RO(oob_sector_size); +static NVM_DEV_ATTR_12_RO(prog_typ); +static NVM_DEV_ATTR_12_RO(prog_max); +static NVM_DEV_ATTR_12_RO(erase_typ); +static NVM_DEV_ATTR_12_RO(erase_max); +static NVM_DEV_ATTR_12_RO(multiplane_modes); +static NVM_DEV_ATTR_12_RO(media_capabilities); +static NVM_DEV_ATTR_12_RO(max_phys_secs); + +/* 2.0 values */ +static NVM_DEV_ATTR_20_RO(groups); +static NVM_DEV_ATTR_20_RO(punits); +static NVM_DEV_ATTR_20_RO(chunks); +static NVM_DEV_ATTR_20_RO(clba); +static NVM_DEV_ATTR_20_RO(ws_min); +static NVM_DEV_ATTR_20_RO(ws_opt); +static NVM_DEV_ATTR_20_RO(maxoc); +static NVM_DEV_ATTR_20_RO(maxocpu); +static NVM_DEV_ATTR_20_RO(mw_cunits); +static NVM_DEV_ATTR_20_RO(write_typ); +static NVM_DEV_ATTR_20_RO(write_max); +static NVM_DEV_ATTR_20_RO(reset_typ); +static NVM_DEV_ATTR_20_RO(reset_max); + +static struct attribute *nvm_dev_attrs[] = { + /* version agnostic attrs */ + &dev_attr_version.attr, + &dev_attr_capabilities.attr, + &dev_attr_read_typ.attr, + &dev_attr_read_max.attr, + + /* 1.2 attrs */ + &dev_attr_vendor_opcode.attr, + &dev_attr_device_mode.attr, + &dev_attr_media_manager.attr, + &dev_attr_ppa_format.attr, + &dev_attr_media_type.attr, + &dev_attr_flash_media_type.attr, + &dev_attr_num_channels.attr, + &dev_attr_num_luns.attr, + &dev_attr_num_planes.attr, + &dev_attr_num_blocks.attr, + &dev_attr_num_pages.attr, + &dev_attr_page_size.attr, + &dev_attr_hw_sector_size.attr, + &dev_attr_oob_sector_size.attr, + &dev_attr_prog_typ.attr, + &dev_attr_prog_max.attr, + &dev_attr_erase_typ.attr, + &dev_attr_erase_max.attr, + &dev_attr_multiplane_modes.attr, + &dev_attr_media_capabilities.attr, + &dev_attr_max_phys_secs.attr, + + /* 2.0 attrs */ + &dev_attr_groups.attr, + &dev_attr_punits.attr, + &dev_attr_chunks.attr, + &dev_attr_clba.attr, + &dev_attr_ws_min.attr, + &dev_attr_ws_opt.attr, + &dev_attr_maxoc.attr, + &dev_attr_maxocpu.attr, + &dev_attr_mw_cunits.attr, + + &dev_attr_write_typ.attr, + &dev_attr_write_max.attr, + &dev_attr_reset_typ.attr, + &dev_attr_reset_max.attr, + + NULL, +}; + +static umode_t nvm_dev_attrs_visible(struct kobject *kobj, + struct attribute *attr, int index) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct gendisk *disk = dev_to_disk(dev); + struct nvme_ns *ns = disk->private_data; + struct nvm_dev *ndev = ns->ndev; + struct device_attribute *dev_attr = + container_of(attr, typeof(*dev_attr), attr); + + if (!ndev) + return 0; + + if (dev_attr->show == nvm_dev_attr_show) + return attr->mode; + + switch (ndev->geo.major_ver_id) { + case 1: + if (dev_attr->show == nvm_dev_attr_show_12) + return attr->mode; + break; + case 2: + if (dev_attr->show == nvm_dev_attr_show_20) + return attr->mode; + break; + } + + return 0; +} + +const struct attribute_group nvme_nvm_attr_group = { + .name = "lightnvm", + .attrs = nvm_dev_attrs, + .is_visible = nvm_dev_attrs_visible, +}; diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c new file mode 100644 index 000000000..022e03643 --- /dev/null +++ b/drivers/nvme/host/multipath.c @@ -0,0 +1,609 @@ +/* + * Copyright (c) 2017-2018 Christoph Hellwig. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/backing-dev.h> +#include <linux/moduleparam.h> +#include <trace/events/block.h> +#include "nvme.h" + +static bool multipath = true; +module_param(multipath, bool, 0444); +MODULE_PARM_DESC(multipath, + "turn on native support for multiple controllers per subsystem"); + +void nvme_mpath_unfreeze(struct nvme_subsystem *subsys) +{ + struct nvme_ns_head *h; + + lockdep_assert_held(&subsys->lock); + list_for_each_entry(h, &subsys->nsheads, entry) + if (h->disk) + blk_mq_unfreeze_queue(h->disk->queue); +} + +void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys) +{ + struct nvme_ns_head *h; + + lockdep_assert_held(&subsys->lock); + list_for_each_entry(h, &subsys->nsheads, entry) + if (h->disk) + blk_mq_freeze_queue_wait(h->disk->queue); +} + +void nvme_mpath_start_freeze(struct nvme_subsystem *subsys) +{ + struct nvme_ns_head *h; + + lockdep_assert_held(&subsys->lock); + list_for_each_entry(h, &subsys->nsheads, entry) + if (h->disk) + blk_freeze_queue_start(h->disk->queue); +} + +/* + * If multipathing is enabled we need to always use the subsystem instance + * number for numbering our devices to avoid conflicts between subsystems that + * have multiple controllers and thus use the multipath-aware subsystem node + * and those that have a single controller and use the controller node + * directly. + */ +void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns, + struct nvme_ctrl *ctrl, int *flags) +{ + if (!multipath) { + sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance); + } else if (ns->head->disk) { + sprintf(disk_name, "nvme%dc%dn%d", ctrl->subsys->instance, + ctrl->cntlid, ns->head->instance); + *flags = GENHD_FL_HIDDEN; + } else { + sprintf(disk_name, "nvme%dn%d", ctrl->subsys->instance, + ns->head->instance); + } +} + +bool nvme_failover_req(struct request *req) +{ + struct nvme_ns *ns = req->q->queuedata; + u16 status = nvme_req(req)->status; + unsigned long flags; + + switch (status & 0x7ff) { + case NVME_SC_ANA_TRANSITION: + case NVME_SC_ANA_INACCESSIBLE: + case NVME_SC_ANA_PERSISTENT_LOSS: + /* + * If we got back an ANA error we know the controller is alive, + * but not ready to serve this namespaces. The spec suggests + * we should update our general state here, but due to the fact + * that the admin and I/O queues are not serialized that is + * fundamentally racy. So instead just clear the current path, + * mark the the path as pending and kick of a re-read of the ANA + * log page ASAP. + */ + nvme_mpath_clear_current_path(ns); + if (ns->ctrl->ana_log_buf) { + set_bit(NVME_NS_ANA_PENDING, &ns->flags); + queue_work(nvme_wq, &ns->ctrl->ana_work); + } + break; + case NVME_SC_HOST_PATH_ERROR: + /* + * Temporary transport disruption in talking to the controller. + * Try to send on a new path. + */ + nvme_mpath_clear_current_path(ns); + break; + default: + /* This was a non-ANA error so follow the normal error path. */ + return false; + } + + spin_lock_irqsave(&ns->head->requeue_lock, flags); + blk_steal_bios(&ns->head->requeue_list, req); + spin_unlock_irqrestore(&ns->head->requeue_lock, flags); + blk_mq_end_request(req, 0); + + kblockd_schedule_work(&ns->head->requeue_work); + return true; +} + +void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) { + if (ns->head->disk) + kblockd_schedule_work(&ns->head->requeue_work); + } + up_read(&ctrl->namespaces_rwsem); +} + +static const char *nvme_ana_state_names[] = { + [0] = "invalid state", + [NVME_ANA_OPTIMIZED] = "optimized", + [NVME_ANA_NONOPTIMIZED] = "non-optimized", + [NVME_ANA_INACCESSIBLE] = "inaccessible", + [NVME_ANA_PERSISTENT_LOSS] = "persistent-loss", + [NVME_ANA_CHANGE] = "change", +}; + +static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head) +{ + struct nvme_ns *ns, *fallback = NULL; + + list_for_each_entry_rcu(ns, &head->list, siblings) { + if (ns->ctrl->state != NVME_CTRL_LIVE || + test_bit(NVME_NS_ANA_PENDING, &ns->flags)) + continue; + switch (ns->ana_state) { + case NVME_ANA_OPTIMIZED: + rcu_assign_pointer(head->current_path, ns); + return ns; + case NVME_ANA_NONOPTIMIZED: + fallback = ns; + break; + default: + break; + } + } + + if (fallback) + rcu_assign_pointer(head->current_path, fallback); + return fallback; +} + +static inline bool nvme_path_is_optimized(struct nvme_ns *ns) +{ + return ns->ctrl->state == NVME_CTRL_LIVE && + ns->ana_state == NVME_ANA_OPTIMIZED; +} + +inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head) +{ + struct nvme_ns *ns = srcu_dereference(head->current_path, &head->srcu); + + if (unlikely(!ns || !nvme_path_is_optimized(ns))) + ns = __nvme_find_path(head); + return ns; +} + +static blk_qc_t nvme_ns_head_make_request(struct request_queue *q, + struct bio *bio) +{ + struct nvme_ns_head *head = q->queuedata; + struct device *dev = disk_to_dev(head->disk); + struct nvme_ns *ns; + blk_qc_t ret = BLK_QC_T_NONE; + int srcu_idx; + + srcu_idx = srcu_read_lock(&head->srcu); + ns = nvme_find_path(head); + if (likely(ns)) { + bio->bi_disk = ns->disk; + bio->bi_opf |= REQ_NVME_MPATH; + trace_block_bio_remap(bio->bi_disk->queue, bio, + disk_devt(ns->head->disk), + bio->bi_iter.bi_sector); + ret = direct_make_request(bio); + } else if (!list_empty_careful(&head->list)) { + dev_warn_ratelimited(dev, "no path available - requeuing I/O\n"); + + spin_lock_irq(&head->requeue_lock); + bio_list_add(&head->requeue_list, bio); + spin_unlock_irq(&head->requeue_lock); + } else { + dev_warn_ratelimited(dev, "no path - failing I/O\n"); + + bio->bi_status = BLK_STS_IOERR; + bio_endio(bio); + } + + srcu_read_unlock(&head->srcu, srcu_idx); + return ret; +} + +static bool nvme_ns_head_poll(struct request_queue *q, blk_qc_t qc) +{ + struct nvme_ns_head *head = q->queuedata; + struct nvme_ns *ns; + bool found = false; + int srcu_idx; + + srcu_idx = srcu_read_lock(&head->srcu); + ns = srcu_dereference(head->current_path, &head->srcu); + if (likely(ns && nvme_path_is_optimized(ns))) + found = ns->queue->poll_fn(q, qc); + srcu_read_unlock(&head->srcu, srcu_idx); + return found; +} + +static void nvme_requeue_work(struct work_struct *work) +{ + struct nvme_ns_head *head = + container_of(work, struct nvme_ns_head, requeue_work); + struct bio *bio, *next; + + spin_lock_irq(&head->requeue_lock); + next = bio_list_get(&head->requeue_list); + spin_unlock_irq(&head->requeue_lock); + + while ((bio = next) != NULL) { + next = bio->bi_next; + bio->bi_next = NULL; + + /* + * Reset disk to the mpath node and resubmit to select a new + * path. + */ + bio->bi_disk = head->disk; + generic_make_request(bio); + } +} + +int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) +{ + struct request_queue *q; + bool vwc = false; + + mutex_init(&head->lock); + bio_list_init(&head->requeue_list); + spin_lock_init(&head->requeue_lock); + INIT_WORK(&head->requeue_work, nvme_requeue_work); + + /* + * Add a multipath node if the subsystems supports multiple controllers. + * We also do this for private namespaces as the namespace sharing data could + * change after a rescan. + */ + if (!(ctrl->subsys->cmic & (1 << 1)) || !multipath) + return 0; + + q = blk_alloc_queue_node(GFP_KERNEL, NUMA_NO_NODE, NULL); + if (!q) + goto out; + q->queuedata = head; + blk_queue_make_request(q, nvme_ns_head_make_request); + q->poll_fn = nvme_ns_head_poll; + blk_queue_flag_set(QUEUE_FLAG_NONROT, q); + /* set to a default value for 512 until disk is validated */ + blk_queue_logical_block_size(q, 512); + blk_set_stacking_limits(&q->limits); + + /* we need to propagate up the VMC settings */ + if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) + vwc = true; + blk_queue_write_cache(q, vwc, vwc); + + head->disk = alloc_disk(0); + if (!head->disk) + goto out_cleanup_queue; + head->disk->fops = &nvme_ns_head_ops; + head->disk->private_data = head; + head->disk->queue = q; + head->disk->flags = GENHD_FL_EXT_DEVT; + sprintf(head->disk->disk_name, "nvme%dn%d", + ctrl->subsys->instance, head->instance); + return 0; + +out_cleanup_queue: + blk_cleanup_queue(q); +out: + return -ENOMEM; +} + +static void nvme_mpath_set_live(struct nvme_ns *ns) +{ + struct nvme_ns_head *head = ns->head; + + lockdep_assert_held(&ns->head->lock); + + if (!head->disk) + return; + + if (!(head->disk->flags & GENHD_FL_UP)) + device_add_disk(&head->subsys->dev, head->disk, + nvme_ns_id_attr_groups); + + synchronize_srcu(&ns->head->srcu); + kblockd_schedule_work(&ns->head->requeue_work); +} + +static int nvme_parse_ana_log(struct nvme_ctrl *ctrl, void *data, + int (*cb)(struct nvme_ctrl *ctrl, struct nvme_ana_group_desc *, + void *)) +{ + void *base = ctrl->ana_log_buf; + size_t offset = sizeof(struct nvme_ana_rsp_hdr); + int error, i; + + lockdep_assert_held(&ctrl->ana_lock); + + for (i = 0; i < le16_to_cpu(ctrl->ana_log_buf->ngrps); i++) { + struct nvme_ana_group_desc *desc = base + offset; + u32 nr_nsids = le32_to_cpu(desc->nnsids); + size_t nsid_buf_size = nr_nsids * sizeof(__le32); + + if (WARN_ON_ONCE(desc->grpid == 0)) + return -EINVAL; + if (WARN_ON_ONCE(le32_to_cpu(desc->grpid) > ctrl->anagrpmax)) + return -EINVAL; + if (WARN_ON_ONCE(desc->state == 0)) + return -EINVAL; + if (WARN_ON_ONCE(desc->state > NVME_ANA_CHANGE)) + return -EINVAL; + + offset += sizeof(*desc); + if (WARN_ON_ONCE(offset > ctrl->ana_log_size - nsid_buf_size)) + return -EINVAL; + + error = cb(ctrl, desc, data); + if (error) + return error; + + offset += nsid_buf_size; + if (WARN_ON_ONCE(offset > ctrl->ana_log_size - sizeof(*desc))) + return -EINVAL; + } + + return 0; +} + +static inline bool nvme_state_is_live(enum nvme_ana_state state) +{ + return state == NVME_ANA_OPTIMIZED || state == NVME_ANA_NONOPTIMIZED; +} + +static void nvme_update_ns_ana_state(struct nvme_ana_group_desc *desc, + struct nvme_ns *ns) +{ + mutex_lock(&ns->head->lock); + ns->ana_grpid = le32_to_cpu(desc->grpid); + ns->ana_state = desc->state; + clear_bit(NVME_NS_ANA_PENDING, &ns->flags); + + if (nvme_state_is_live(ns->ana_state)) + nvme_mpath_set_live(ns); + mutex_unlock(&ns->head->lock); +} + +static int nvme_update_ana_state(struct nvme_ctrl *ctrl, + struct nvme_ana_group_desc *desc, void *data) +{ + u32 nr_nsids = le32_to_cpu(desc->nnsids), n = 0; + unsigned *nr_change_groups = data; + struct nvme_ns *ns; + + dev_info(ctrl->device, "ANA group %d: %s.\n", + le32_to_cpu(desc->grpid), + nvme_ana_state_names[desc->state]); + + if (desc->state == NVME_ANA_CHANGE) + (*nr_change_groups)++; + + if (!nr_nsids) + return 0; + + down_read(&ctrl->namespaces_rwsem); + list_for_each_entry(ns, &ctrl->namespaces, list) { + unsigned nsid; +again: + nsid = le32_to_cpu(desc->nsids[n]); + if (ns->head->ns_id < nsid) + continue; + if (ns->head->ns_id == nsid) + nvme_update_ns_ana_state(desc, ns); + if (++n == nr_nsids) + break; + if (ns->head->ns_id > nsid) + goto again; + } + up_read(&ctrl->namespaces_rwsem); + return 0; +} + +static int nvme_read_ana_log(struct nvme_ctrl *ctrl, bool groups_only) +{ + u32 nr_change_groups = 0; + int error; + + mutex_lock(&ctrl->ana_lock); + error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_ANA, + groups_only ? NVME_ANA_LOG_RGO : 0, + ctrl->ana_log_buf, ctrl->ana_log_size, 0); + if (error) { + dev_warn(ctrl->device, "Failed to get ANA log: %d\n", error); + goto out_unlock; + } + + error = nvme_parse_ana_log(ctrl, &nr_change_groups, + nvme_update_ana_state); + if (error) + goto out_unlock; + + /* + * In theory we should have an ANATT timer per group as they might enter + * the change state at different times. But that is a lot of overhead + * just to protect against a target that keeps entering new changes + * states while never finishing previous ones. But we'll still + * eventually time out once all groups are in change state, so this + * isn't a big deal. + * + * We also double the ANATT value to provide some slack for transports + * or AEN processing overhead. + */ + if (nr_change_groups) + mod_timer(&ctrl->anatt_timer, ctrl->anatt * HZ * 2 + jiffies); + else + del_timer_sync(&ctrl->anatt_timer); +out_unlock: + mutex_unlock(&ctrl->ana_lock); + return error; +} + +static void nvme_ana_work(struct work_struct *work) +{ + struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, ana_work); + + nvme_read_ana_log(ctrl, false); +} + +static void nvme_anatt_timeout(struct timer_list *t) +{ + struct nvme_ctrl *ctrl = from_timer(ctrl, t, anatt_timer); + + dev_info(ctrl->device, "ANATT timeout, resetting controller.\n"); + nvme_reset_ctrl(ctrl); +} + +void nvme_mpath_stop(struct nvme_ctrl *ctrl) +{ + if (!nvme_ctrl_use_ana(ctrl)) + return; + del_timer_sync(&ctrl->anatt_timer); + cancel_work_sync(&ctrl->ana_work); +} + +static ssize_t ana_grpid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", nvme_get_ns_from_dev(dev)->ana_grpid); +} +DEVICE_ATTR_RO(ana_grpid); + +static ssize_t ana_state_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct nvme_ns *ns = nvme_get_ns_from_dev(dev); + + return sprintf(buf, "%s\n", nvme_ana_state_names[ns->ana_state]); +} +DEVICE_ATTR_RO(ana_state); + +static int nvme_lookup_ana_group_desc(struct nvme_ctrl *ctrl, + struct nvme_ana_group_desc *desc, void *data) +{ + struct nvme_ana_group_desc *dst = data; + + if (desc->grpid != dst->grpid) + return 0; + + *dst = *desc; + return -ENXIO; /* just break out of the loop */ +} + +void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id) +{ + if (nvme_ctrl_use_ana(ns->ctrl)) { + struct nvme_ana_group_desc desc = { + .grpid = id->anagrpid, + .state = 0, + }; + + mutex_lock(&ns->ctrl->ana_lock); + ns->ana_grpid = le32_to_cpu(id->anagrpid); + nvme_parse_ana_log(ns->ctrl, &desc, nvme_lookup_ana_group_desc); + mutex_unlock(&ns->ctrl->ana_lock); + if (desc.state) { + /* found the group desc: update */ + nvme_update_ns_ana_state(&desc, ns); + } else { + /* group desc not found: trigger a re-read */ + set_bit(NVME_NS_ANA_PENDING, &ns->flags); + queue_work(nvme_wq, &ns->ctrl->ana_work); + } + } else { + mutex_lock(&ns->head->lock); + ns->ana_state = NVME_ANA_OPTIMIZED; + nvme_mpath_set_live(ns); + mutex_unlock(&ns->head->lock); + } + + if (bdi_cap_stable_pages_required(ns->queue->backing_dev_info)) { + struct gendisk *disk = ns->head->disk; + + if (disk) + disk->queue->backing_dev_info->capabilities |= + BDI_CAP_STABLE_WRITES; + } +} + +void nvme_mpath_remove_disk(struct nvme_ns_head *head) +{ + if (!head->disk) + return; + if (head->disk->flags & GENHD_FL_UP) + del_gendisk(head->disk); + blk_set_queue_dying(head->disk->queue); + /* make sure all pending bios are cleaned up */ + kblockd_schedule_work(&head->requeue_work); + flush_work(&head->requeue_work); + blk_cleanup_queue(head->disk->queue); + put_disk(head->disk); +} + +int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) +{ + int error; + + /* check if multipath is enabled and we have the capability */ + if (!multipath || !ctrl->subsys || !(ctrl->subsys->cmic & (1 << 3))) + return 0; + + ctrl->anacap = id->anacap; + ctrl->anatt = id->anatt; + ctrl->nanagrpid = le32_to_cpu(id->nanagrpid); + ctrl->anagrpmax = le32_to_cpu(id->anagrpmax); + + mutex_init(&ctrl->ana_lock); + timer_setup(&ctrl->anatt_timer, nvme_anatt_timeout, 0); + ctrl->ana_log_size = sizeof(struct nvme_ana_rsp_hdr) + + ctrl->nanagrpid * sizeof(struct nvme_ana_group_desc); + ctrl->ana_log_size += ctrl->max_namespaces * sizeof(__le32); + + if (ctrl->ana_log_size > ctrl->max_hw_sectors << SECTOR_SHIFT) { + dev_err(ctrl->device, + "ANA log page size (%zd) larger than MDTS (%d).\n", + ctrl->ana_log_size, + ctrl->max_hw_sectors << SECTOR_SHIFT); + dev_err(ctrl->device, "disabling ANA support.\n"); + return 0; + } + + INIT_WORK(&ctrl->ana_work, nvme_ana_work); + kfree(ctrl->ana_log_buf); + ctrl->ana_log_buf = kmalloc(ctrl->ana_log_size, GFP_KERNEL); + if (!ctrl->ana_log_buf) { + error = -ENOMEM; + goto out; + } + + error = nvme_read_ana_log(ctrl, false); + if (error) + goto out_free_ana_log_buf; + return 0; +out_free_ana_log_buf: + kfree(ctrl->ana_log_buf); + ctrl->ana_log_buf = NULL; +out: + return error; +} + +void nvme_mpath_uninit(struct nvme_ctrl *ctrl) +{ + kfree(ctrl->ana_log_buf); + ctrl->ana_log_buf = NULL; +} + diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h new file mode 100644 index 000000000..276975506 --- /dev/null +++ b/drivers/nvme/host/nvme.h @@ -0,0 +1,618 @@ +/* + * Copyright (c) 2011-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef _NVME_H +#define _NVME_H + +#include <linux/nvme.h> +#include <linux/cdev.h> +#include <linux/pci.h> +#include <linux/kref.h> +#include <linux/blk-mq.h> +#include <linux/lightnvm.h> +#include <linux/sed-opal.h> +#include <linux/fault-inject.h> +#include <linux/rcupdate.h> + +extern unsigned int nvme_io_timeout; +#define NVME_IO_TIMEOUT (nvme_io_timeout * HZ) + +extern unsigned int admin_timeout; +#define ADMIN_TIMEOUT (admin_timeout * HZ) + +#define NVME_DEFAULT_KATO 5 +#define NVME_KATO_GRACE 10 + +extern struct workqueue_struct *nvme_wq; +extern struct workqueue_struct *nvme_reset_wq; +extern struct workqueue_struct *nvme_delete_wq; + +enum { + NVME_NS_LBA = 0, + NVME_NS_LIGHTNVM = 1, +}; + +/* + * List of workarounds for devices that required behavior not specified in + * the standard. + */ +enum nvme_quirks { + /* + * Prefers I/O aligned to a stripe size specified in a vendor + * specific Identify field. + */ + NVME_QUIRK_STRIPE_SIZE = (1 << 0), + + /* + * The controller doesn't handle Identify value others than 0 or 1 + * correctly. + */ + NVME_QUIRK_IDENTIFY_CNS = (1 << 1), + + /* + * The controller deterministically returns O's on reads to + * logical blocks that deallocate was called on. + */ + NVME_QUIRK_DEALLOCATE_ZEROES = (1 << 2), + + /* + * The controller needs a delay before starts checking the device + * readiness, which is done by reading the NVME_CSTS_RDY bit. + */ + NVME_QUIRK_DELAY_BEFORE_CHK_RDY = (1 << 3), + + /* + * APST should not be used. + */ + NVME_QUIRK_NO_APST = (1 << 4), + + /* + * The deepest sleep state should not be used. + */ + NVME_QUIRK_NO_DEEPEST_PS = (1 << 5), + + /* + * Supports the LighNVM command set if indicated in vs[1]. + */ + NVME_QUIRK_LIGHTNVM = (1 << 6), + + /* + * Set MEDIUM priority on SQ creation + */ + NVME_QUIRK_MEDIUM_PRIO_SQ = (1 << 7), +}; + +/* + * Common request structure for NVMe passthrough. All drivers must have + * this structure as the first member of their request-private data. + */ +struct nvme_request { + struct nvme_command *cmd; + union nvme_result result; + u8 retries; + u8 flags; + u16 status; + struct nvme_ctrl *ctrl; +}; + +/* + * Mark a bio as coming in through the mpath node. + */ +#define REQ_NVME_MPATH REQ_DRV + +enum { + NVME_REQ_CANCELLED = (1 << 0), + NVME_REQ_USERCMD = (1 << 1), +}; + +static inline struct nvme_request *nvme_req(struct request *req) +{ + return blk_mq_rq_to_pdu(req); +} + +static inline u16 nvme_req_qid(struct request *req) +{ + if (!req->rq_disk) + return 0; + return blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(req)) + 1; +} + +/* The below value is the specific amount of delay needed before checking + * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the + * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was + * found empirically. + */ +#define NVME_QUIRK_DELAY_AMOUNT 2300 + +enum nvme_ctrl_state { + NVME_CTRL_NEW, + NVME_CTRL_LIVE, + NVME_CTRL_ADMIN_ONLY, /* Only admin queue live */ + NVME_CTRL_RESETTING, + NVME_CTRL_CONNECTING, + NVME_CTRL_DELETING, + NVME_CTRL_DEAD, +}; + +struct nvme_ctrl { + enum nvme_ctrl_state state; + bool identified; + spinlock_t lock; + struct mutex scan_lock; + const struct nvme_ctrl_ops *ops; + struct request_queue *admin_q; + struct request_queue *connect_q; + struct device *dev; + int instance; + struct blk_mq_tag_set *tagset; + struct blk_mq_tag_set *admin_tagset; + struct list_head namespaces; + struct rw_semaphore namespaces_rwsem; + struct device ctrl_device; + struct device *device; /* char device */ + struct cdev cdev; + struct work_struct reset_work; + struct work_struct delete_work; + + struct nvme_subsystem *subsys; + struct list_head subsys_entry; + + struct opal_dev *opal_dev; + + char name[12]; + u16 cntlid; + + u32 ctrl_config; + u16 mtfa; + u32 queue_count; + + u64 cap; + u32 page_size; + u32 max_hw_sectors; + u32 max_segments; + u16 oncs; + u16 oacs; + u16 nssa; + u16 nr_streams; + u32 max_namespaces; + atomic_t abort_limit; + u8 vwc; + u32 vs; + u32 sgls; + u16 kas; + u8 npss; + u8 apsta; + u32 oaes; + u32 aen_result; + unsigned int shutdown_timeout; + unsigned int kato; + bool subsystem; + unsigned long quirks; + struct nvme_id_power_state psd[32]; + struct nvme_effects_log *effects; + struct work_struct scan_work; + struct work_struct async_event_work; + struct delayed_work ka_work; + struct nvme_command ka_cmd; + struct work_struct fw_act_work; + unsigned long events; + bool created; + +#ifdef CONFIG_NVME_MULTIPATH + /* asymmetric namespace access: */ + u8 anacap; + u8 anatt; + u32 anagrpmax; + u32 nanagrpid; + struct mutex ana_lock; + struct nvme_ana_rsp_hdr *ana_log_buf; + size_t ana_log_size; + struct timer_list anatt_timer; + struct work_struct ana_work; +#endif + + /* Power saving configuration */ + u64 ps_max_latency_us; + bool apst_enabled; + + /* PCIe only: */ + u32 hmpre; + u32 hmmin; + u32 hmminds; + u16 hmmaxd; + + /* Fabrics only */ + u16 sqsize; + u32 ioccsz; + u32 iorcsz; + u16 icdoff; + u16 maxcmd; + int nr_reconnects; + struct nvmf_ctrl_options *opts; + + struct page *discard_page; + unsigned long discard_page_busy; +}; + +struct nvme_subsystem { + int instance; + struct device dev; + /* + * Because we unregister the device on the last put we need + * a separate refcount. + */ + struct kref ref; + struct list_head entry; + struct mutex lock; + struct list_head ctrls; + struct list_head nsheads; + char subnqn[NVMF_NQN_SIZE]; + char serial[20]; + char model[40]; + char firmware_rev[8]; + u8 cmic; + u16 vendor_id; + struct ida ns_ida; +}; + +/* + * Container structure for uniqueue namespace identifiers. + */ +struct nvme_ns_ids { + u8 eui64[8]; + u8 nguid[16]; + uuid_t uuid; +}; + +/* + * Anchor structure for namespaces. There is one for each namespace in a + * NVMe subsystem that any of our controllers can see, and the namespace + * structure for each controller is chained of it. For private namespaces + * there is a 1:1 relation to our namespace structures, that is ->list + * only ever has a single entry for private namespaces. + */ +struct nvme_ns_head { +#ifdef CONFIG_NVME_MULTIPATH + struct gendisk *disk; + struct nvme_ns __rcu *current_path; + struct bio_list requeue_list; + spinlock_t requeue_lock; + struct work_struct requeue_work; + struct mutex lock; +#endif + struct list_head list; + struct srcu_struct srcu; + struct nvme_subsystem *subsys; + unsigned ns_id; + struct nvme_ns_ids ids; + struct list_head entry; + struct kref ref; + int instance; +}; + +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS +struct nvme_fault_inject { + struct fault_attr attr; + struct dentry *parent; + bool dont_retry; /* DNR, do not retry */ + u16 status; /* status code */ +}; +#endif + +struct nvme_ns { + struct list_head list; + + struct nvme_ctrl *ctrl; + struct request_queue *queue; + struct gendisk *disk; +#ifdef CONFIG_NVME_MULTIPATH + enum nvme_ana_state ana_state; + u32 ana_grpid; +#endif + struct list_head siblings; + struct nvm_dev *ndev; + struct kref kref; + struct nvme_ns_head *head; + + int lba_shift; + u16 ms; + u16 sgs; + u32 sws; + bool ext; + u8 pi_type; + unsigned long flags; +#define NVME_NS_REMOVING 0 +#define NVME_NS_DEAD 1 +#define NVME_NS_ANA_PENDING 2 + u16 noiob; + +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS + struct nvme_fault_inject fault_inject; +#endif + +}; + +struct nvme_ctrl_ops { + const char *name; + struct module *module; + unsigned int flags; +#define NVME_F_FABRICS (1 << 0) +#define NVME_F_METADATA_SUPPORTED (1 << 1) + int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val); + int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val); + int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val); + void (*free_ctrl)(struct nvme_ctrl *ctrl); + void (*submit_async_event)(struct nvme_ctrl *ctrl); + void (*delete_ctrl)(struct nvme_ctrl *ctrl); + int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size); + void (*stop_ctrl)(struct nvme_ctrl *ctrl); +}; + +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS +void nvme_fault_inject_init(struct nvme_ns *ns); +void nvme_fault_inject_fini(struct nvme_ns *ns); +void nvme_should_fail(struct request *req); +#else +static inline void nvme_fault_inject_init(struct nvme_ns *ns) {} +static inline void nvme_fault_inject_fini(struct nvme_ns *ns) {} +static inline void nvme_should_fail(struct request *req) {} +#endif + +static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl) +{ + u32 val = 0; + + if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val)) + return false; + return val & NVME_CSTS_RDY; +} + +static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl) +{ + if (!ctrl->subsystem) + return -ENOTTY; + return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65); +} + +static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector) +{ + return (sector >> (ns->lba_shift - 9)); +} + +static inline void nvme_end_request(struct request *req, __le16 status, + union nvme_result result) +{ + struct nvme_request *rq = nvme_req(req); + + rq->status = le16_to_cpu(status) >> 1; + rq->result = result; + /* inject error when permitted by fault injection framework */ + nvme_should_fail(req); + blk_mq_complete_request(req); +} + +static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl) +{ + get_device(ctrl->device); +} + +static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl) +{ + put_device(ctrl->device); +} + +void nvme_complete_rq(struct request *req); +void nvme_cancel_request(struct request *req, void *data, bool reserved); +bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, + enum nvme_ctrl_state new_state); +int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap); +int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap); +int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl); +int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, + const struct nvme_ctrl_ops *ops, unsigned long quirks); +void nvme_uninit_ctrl(struct nvme_ctrl *ctrl); +void nvme_start_ctrl(struct nvme_ctrl *ctrl); +void nvme_stop_ctrl(struct nvme_ctrl *ctrl); +void nvme_put_ctrl(struct nvme_ctrl *ctrl); +int nvme_init_identify(struct nvme_ctrl *ctrl); + +void nvme_remove_namespaces(struct nvme_ctrl *ctrl); + +int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len, + bool send); + +void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status, + volatile union nvme_result *res); + +void nvme_stop_queues(struct nvme_ctrl *ctrl); +void nvme_start_queues(struct nvme_ctrl *ctrl); +void nvme_kill_queues(struct nvme_ctrl *ctrl); +void nvme_unfreeze(struct nvme_ctrl *ctrl); +void nvme_wait_freeze(struct nvme_ctrl *ctrl); +void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout); +void nvme_start_freeze(struct nvme_ctrl *ctrl); + +#define NVME_QID_ANY -1 +struct request *nvme_alloc_request(struct request_queue *q, + struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid); +void nvme_cleanup_cmd(struct request *req); +blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req, + struct nvme_command *cmd); +int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, + void *buf, unsigned bufflen); +int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, + union nvme_result *result, void *buffer, unsigned bufflen, + unsigned timeout, int qid, int at_head, + blk_mq_req_flags_t flags); +int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count); +void nvme_stop_keep_alive(struct nvme_ctrl *ctrl); +int nvme_reset_ctrl(struct nvme_ctrl *ctrl); +int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl); +int nvme_delete_ctrl(struct nvme_ctrl *ctrl); +int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl); + +int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, + void *log, size_t size, u64 offset); + +extern const struct attribute_group *nvme_ns_id_attr_groups[]; +extern const struct block_device_operations nvme_ns_head_ops; + +#ifdef CONFIG_NVME_MULTIPATH +static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl) +{ + return ctrl->ana_log_buf != NULL; +} + +void nvme_mpath_unfreeze(struct nvme_subsystem *subsys); +void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys); +void nvme_mpath_start_freeze(struct nvme_subsystem *subsys); +void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns, + struct nvme_ctrl *ctrl, int *flags); +bool nvme_failover_req(struct request *req); +void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl); +int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head); +void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id); +void nvme_mpath_remove_disk(struct nvme_ns_head *head); +int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id); +void nvme_mpath_uninit(struct nvme_ctrl *ctrl); +void nvme_mpath_stop(struct nvme_ctrl *ctrl); + +static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns) +{ + struct nvme_ns_head *head = ns->head; + + if (head && ns == rcu_access_pointer(head->current_path)) + rcu_assign_pointer(head->current_path, NULL); +} +struct nvme_ns *nvme_find_path(struct nvme_ns_head *head); + +static inline void nvme_mpath_check_last_path(struct nvme_ns *ns) +{ + struct nvme_ns_head *head = ns->head; + + if (head->disk && list_empty(&head->list)) + kblockd_schedule_work(&head->requeue_work); +} + +static inline void nvme_mpath_update_disk_size(struct gendisk *disk) +{ + struct block_device *bdev = bdget_disk(disk, 0); + + if (bdev) { + bd_set_size(bdev, get_capacity(disk) << SECTOR_SHIFT); + bdput(bdev); + } +} + +extern struct device_attribute dev_attr_ana_grpid; +extern struct device_attribute dev_attr_ana_state; + +#else +static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl) +{ + return false; +} +/* + * Without the multipath code enabled, multiple controller per subsystems are + * visible as devices and thus we cannot use the subsystem instance. + */ +static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns, + struct nvme_ctrl *ctrl, int *flags) +{ + sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance); +} + +static inline bool nvme_failover_req(struct request *req) +{ + return false; +} +static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) +{ +} +static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, + struct nvme_ns_head *head) +{ + return 0; +} +static inline void nvme_mpath_add_disk(struct nvme_ns *ns, + struct nvme_id_ns *id) +{ +} +static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head) +{ +} +static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns) +{ +} +static inline void nvme_mpath_check_last_path(struct nvme_ns *ns) +{ +} +static inline int nvme_mpath_init(struct nvme_ctrl *ctrl, + struct nvme_id_ctrl *id) +{ + if (ctrl->subsys->cmic & (1 << 3)) + dev_warn(ctrl->device, +"Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n"); + return 0; +} +static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl) +{ +} +static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl) +{ +} +static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys) +{ +} +static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys) +{ +} +static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys) +{ +} +static inline void nvme_mpath_update_disk_size(struct gendisk *disk) +{ +} +#endif /* CONFIG_NVME_MULTIPATH */ + +#ifdef CONFIG_NVM +void nvme_nvm_update_nvm_info(struct nvme_ns *ns); +int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node); +void nvme_nvm_unregister(struct nvme_ns *ns); +extern const struct attribute_group nvme_nvm_attr_group; +int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg); +#else +static inline void nvme_nvm_update_nvm_info(struct nvme_ns *ns) {}; +static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, + int node) +{ + return 0; +} + +static inline void nvme_nvm_unregister(struct nvme_ns *ns) {}; +static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, + unsigned long arg) +{ + return -ENOTTY; +} +#endif /* CONFIG_NVM */ + +static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev) +{ + return dev_to_disk(dev)->private_data; +} + +int __init nvme_core_init(void); +void nvme_core_exit(void); + +#endif /* _NVME_H */ diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c new file mode 100644 index 000000000..b06d2b6bd --- /dev/null +++ b/drivers/nvme/host/pci.c @@ -0,0 +1,2775 @@ +/* + * NVM Express device driver + * Copyright (c) 2011-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/aer.h> +#include <linux/async.h> +#include <linux/blkdev.h> +#include <linux/blk-mq.h> +#include <linux/blk-mq-pci.h> +#include <linux/dmi.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/once.h> +#include <linux/pci.h> +#include <linux/t10-pi.h> +#include <linux/types.h> +#include <linux/io-64-nonatomic-lo-hi.h> +#include <linux/sed-opal.h> + +#include "nvme.h" + +#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) +#define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) + +#define SGES_PER_PAGE (PAGE_SIZE / sizeof(struct nvme_sgl_desc)) + +/* + * These can be higher, but we need to ensure that any command doesn't + * require an sg allocation that needs more than a page of data. + */ +#define NVME_MAX_KB_SZ 4096 +#define NVME_MAX_SEGS 127 + +static int use_threaded_interrupts; +module_param(use_threaded_interrupts, int, 0); + +static bool use_cmb_sqes = true; +module_param(use_cmb_sqes, bool, 0444); +MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); + +static unsigned int max_host_mem_size_mb = 128; +module_param(max_host_mem_size_mb, uint, 0444); +MODULE_PARM_DESC(max_host_mem_size_mb, + "Maximum Host Memory Buffer (HMB) size per controller (in MiB)"); + +static unsigned int sgl_threshold = SZ_32K; +module_param(sgl_threshold, uint, 0644); +MODULE_PARM_DESC(sgl_threshold, + "Use SGLs when average request segment size is larger or equal to " + "this size. Use 0 to disable SGLs."); + +static int io_queue_depth_set(const char *val, const struct kernel_param *kp); +static const struct kernel_param_ops io_queue_depth_ops = { + .set = io_queue_depth_set, + .get = param_get_int, +}; + +static int io_queue_depth = 1024; +module_param_cb(io_queue_depth, &io_queue_depth_ops, &io_queue_depth, 0644); +MODULE_PARM_DESC(io_queue_depth, "set io queue depth, should >= 2"); + +struct nvme_dev; +struct nvme_queue; + +static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown); + +/* + * Represents an NVM Express device. Each nvme_dev is a PCI function. + */ +struct nvme_dev { + struct nvme_queue *queues; + struct blk_mq_tag_set tagset; + struct blk_mq_tag_set admin_tagset; + u32 __iomem *dbs; + struct device *dev; + struct dma_pool *prp_page_pool; + struct dma_pool *prp_small_pool; + unsigned online_queues; + unsigned max_qid; + unsigned int num_vecs; + int q_depth; + u32 db_stride; + void __iomem *bar; + unsigned long bar_mapped_size; + struct work_struct remove_work; + struct mutex shutdown_lock; + bool subsystem; + void __iomem *cmb; + pci_bus_addr_t cmb_bus_addr; + u64 cmb_size; + u32 cmbsz; + u32 cmbloc; + struct nvme_ctrl ctrl; + struct completion ioq_wait; + + mempool_t *iod_mempool; + + /* shadow doorbell buffer support: */ + u32 *dbbuf_dbs; + dma_addr_t dbbuf_dbs_dma_addr; + u32 *dbbuf_eis; + dma_addr_t dbbuf_eis_dma_addr; + + /* host memory buffer support: */ + u64 host_mem_size; + u32 nr_host_mem_descs; + dma_addr_t host_mem_descs_dma; + struct nvme_host_mem_buf_desc *host_mem_descs; + void **host_mem_desc_bufs; +}; + +static int io_queue_depth_set(const char *val, const struct kernel_param *kp) +{ + int n = 0, ret; + + ret = kstrtoint(val, 10, &n); + if (ret != 0 || n < 2) + return -EINVAL; + + return param_set_int(val, kp); +} + +static inline unsigned int sq_idx(unsigned int qid, u32 stride) +{ + return qid * 2 * stride; +} + +static inline unsigned int cq_idx(unsigned int qid, u32 stride) +{ + return (qid * 2 + 1) * stride; +} + +static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl) +{ + return container_of(ctrl, struct nvme_dev, ctrl); +} + +/* + * An NVM Express queue. Each device has at least two (one for admin + * commands and one for I/O commands). + */ +struct nvme_queue { + struct device *q_dmadev; + struct nvme_dev *dev; + spinlock_t sq_lock; + struct nvme_command *sq_cmds; + struct nvme_command __iomem *sq_cmds_io; + spinlock_t cq_lock ____cacheline_aligned_in_smp; + volatile struct nvme_completion *cqes; + struct blk_mq_tags **tags; + dma_addr_t sq_dma_addr; + dma_addr_t cq_dma_addr; + u32 __iomem *q_db; + u16 q_depth; + s16 cq_vector; + u16 sq_tail; + u16 cq_head; + u16 last_cq_head; + u16 qid; + u8 cq_phase; + u32 *dbbuf_sq_db; + u32 *dbbuf_cq_db; + u32 *dbbuf_sq_ei; + u32 *dbbuf_cq_ei; +}; + +/* + * The nvme_iod describes the data in an I/O, including the list of PRP + * entries. You can't see it in this data structure because C doesn't let + * me express that. Use nvme_init_iod to ensure there's enough space + * allocated to store the PRP list. + */ +struct nvme_iod { + struct nvme_request req; + struct nvme_queue *nvmeq; + bool use_sgl; + int aborted; + int npages; /* In the PRP list. 0 means small pool in use */ + int nents; /* Used in scatterlist */ + int length; /* Of data, in bytes */ + dma_addr_t first_dma; + struct scatterlist meta_sg; /* metadata requires single contiguous buffer */ + struct scatterlist *sg; + struct scatterlist inline_sg[0]; +}; + +/* + * Check we didin't inadvertently grow the command struct + */ +static inline void _nvme_check_size(void) +{ + BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); + BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); + BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); + BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); + BUILD_BUG_ON(sizeof(struct nvme_features) != 64); + BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); + BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); + BUILD_BUG_ON(sizeof(struct nvme_command) != 64); + BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != NVME_IDENTIFY_DATA_SIZE); + BUILD_BUG_ON(sizeof(struct nvme_id_ns) != NVME_IDENTIFY_DATA_SIZE); + BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); + BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); + BUILD_BUG_ON(sizeof(struct nvme_dbbuf) != 64); +} + +static inline unsigned int nvme_dbbuf_size(u32 stride) +{ + return ((num_possible_cpus() + 1) * 8 * stride); +} + +static int nvme_dbbuf_dma_alloc(struct nvme_dev *dev) +{ + unsigned int mem_size = nvme_dbbuf_size(dev->db_stride); + + if (dev->dbbuf_dbs) + return 0; + + dev->dbbuf_dbs = dma_alloc_coherent(dev->dev, mem_size, + &dev->dbbuf_dbs_dma_addr, + GFP_KERNEL); + if (!dev->dbbuf_dbs) + return -ENOMEM; + dev->dbbuf_eis = dma_alloc_coherent(dev->dev, mem_size, + &dev->dbbuf_eis_dma_addr, + GFP_KERNEL); + if (!dev->dbbuf_eis) { + dma_free_coherent(dev->dev, mem_size, + dev->dbbuf_dbs, dev->dbbuf_dbs_dma_addr); + dev->dbbuf_dbs = NULL; + return -ENOMEM; + } + + return 0; +} + +static void nvme_dbbuf_dma_free(struct nvme_dev *dev) +{ + unsigned int mem_size = nvme_dbbuf_size(dev->db_stride); + + if (dev->dbbuf_dbs) { + dma_free_coherent(dev->dev, mem_size, + dev->dbbuf_dbs, dev->dbbuf_dbs_dma_addr); + dev->dbbuf_dbs = NULL; + } + if (dev->dbbuf_eis) { + dma_free_coherent(dev->dev, mem_size, + dev->dbbuf_eis, dev->dbbuf_eis_dma_addr); + dev->dbbuf_eis = NULL; + } +} + +static void nvme_dbbuf_init(struct nvme_dev *dev, + struct nvme_queue *nvmeq, int qid) +{ + if (!dev->dbbuf_dbs || !qid) + return; + + nvmeq->dbbuf_sq_db = &dev->dbbuf_dbs[sq_idx(qid, dev->db_stride)]; + nvmeq->dbbuf_cq_db = &dev->dbbuf_dbs[cq_idx(qid, dev->db_stride)]; + nvmeq->dbbuf_sq_ei = &dev->dbbuf_eis[sq_idx(qid, dev->db_stride)]; + nvmeq->dbbuf_cq_ei = &dev->dbbuf_eis[cq_idx(qid, dev->db_stride)]; +} + +static void nvme_dbbuf_free(struct nvme_queue *nvmeq) +{ + if (!nvmeq->qid) + return; + + nvmeq->dbbuf_sq_db = NULL; + nvmeq->dbbuf_cq_db = NULL; + nvmeq->dbbuf_sq_ei = NULL; + nvmeq->dbbuf_cq_ei = NULL; +} + +static void nvme_dbbuf_set(struct nvme_dev *dev) +{ + struct nvme_command c; + unsigned int i; + + if (!dev->dbbuf_dbs) + return; + + memset(&c, 0, sizeof(c)); + c.dbbuf.opcode = nvme_admin_dbbuf; + c.dbbuf.prp1 = cpu_to_le64(dev->dbbuf_dbs_dma_addr); + c.dbbuf.prp2 = cpu_to_le64(dev->dbbuf_eis_dma_addr); + + if (nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0)) { + dev_warn(dev->ctrl.device, "unable to set dbbuf\n"); + /* Free memory and continue on */ + nvme_dbbuf_dma_free(dev); + + for (i = 1; i <= dev->online_queues; i++) + nvme_dbbuf_free(&dev->queues[i]); + } +} + +static inline int nvme_dbbuf_need_event(u16 event_idx, u16 new_idx, u16 old) +{ + return (u16)(new_idx - event_idx - 1) < (u16)(new_idx - old); +} + +/* Update dbbuf and return true if an MMIO is required */ +static bool nvme_dbbuf_update_and_check_event(u16 value, u32 *dbbuf_db, + volatile u32 *dbbuf_ei) +{ + if (dbbuf_db) { + u16 old_value; + + /* + * Ensure that the queue is written before updating + * the doorbell in memory + */ + wmb(); + + old_value = *dbbuf_db; + *dbbuf_db = value; + + /* + * Ensure that the doorbell is updated before reading the event + * index from memory. The controller needs to provide similar + * ordering to ensure the envent index is updated before reading + * the doorbell. + */ + mb(); + + if (!nvme_dbbuf_need_event(*dbbuf_ei, value, old_value)) + return false; + } + + return true; +} + +/* + * Max size of iod being embedded in the request payload + */ +#define NVME_INT_PAGES 2 +#define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size) + +/* + * Will slightly overestimate the number of pages needed. This is OK + * as it only leads to a small amount of wasted memory for the lifetime of + * the I/O. + */ +static int nvme_npages(unsigned size, struct nvme_dev *dev) +{ + unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size, + dev->ctrl.page_size); + return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); +} + +/* + * Calculates the number of pages needed for the SGL segments. For example a 4k + * page can accommodate 256 SGL descriptors. + */ +static int nvme_pci_npages_sgl(unsigned int num_seg) +{ + return DIV_ROUND_UP(num_seg * sizeof(struct nvme_sgl_desc), PAGE_SIZE); +} + +static unsigned int nvme_pci_iod_alloc_size(struct nvme_dev *dev, + unsigned int size, unsigned int nseg, bool use_sgl) +{ + size_t alloc_size; + + if (use_sgl) + alloc_size = sizeof(__le64 *) * nvme_pci_npages_sgl(nseg); + else + alloc_size = sizeof(__le64 *) * nvme_npages(size, dev); + + return alloc_size + sizeof(struct scatterlist) * nseg; +} + +static unsigned int nvme_pci_cmd_size(struct nvme_dev *dev, bool use_sgl) +{ + unsigned int alloc_size = nvme_pci_iod_alloc_size(dev, + NVME_INT_BYTES(dev), NVME_INT_PAGES, + use_sgl); + + return sizeof(struct nvme_iod) + alloc_size; +} + +static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_dev *dev = data; + struct nvme_queue *nvmeq = &dev->queues[0]; + + WARN_ON(hctx_idx != 0); + WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); + WARN_ON(nvmeq->tags); + + hctx->driver_data = nvmeq; + nvmeq->tags = &dev->admin_tagset.tags[0]; + return 0; +} + +static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) +{ + struct nvme_queue *nvmeq = hctx->driver_data; + + nvmeq->tags = NULL; +} + +static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_dev *dev = data; + struct nvme_queue *nvmeq = &dev->queues[hctx_idx + 1]; + + if (!nvmeq->tags) + nvmeq->tags = &dev->tagset.tags[hctx_idx]; + + WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); + hctx->driver_data = nvmeq; + return 0; +} + +static int nvme_init_request(struct blk_mq_tag_set *set, struct request *req, + unsigned int hctx_idx, unsigned int numa_node) +{ + struct nvme_dev *dev = set->driver_data; + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + int queue_idx = (set == &dev->tagset) ? hctx_idx + 1 : 0; + struct nvme_queue *nvmeq = &dev->queues[queue_idx]; + + BUG_ON(!nvmeq); + iod->nvmeq = nvmeq; + + nvme_req(req)->ctrl = &dev->ctrl; + return 0; +} + +static int nvme_pci_map_queues(struct blk_mq_tag_set *set) +{ + struct nvme_dev *dev = set->driver_data; + + return blk_mq_pci_map_queues(set, to_pci_dev(dev->dev), + dev->num_vecs > 1 ? 1 /* admin queue */ : 0); +} + +/** + * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell + * @nvmeq: The queue to use + * @cmd: The command to send + */ +static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) +{ + spin_lock(&nvmeq->sq_lock); + if (nvmeq->sq_cmds_io) + memcpy_toio(&nvmeq->sq_cmds_io[nvmeq->sq_tail], cmd, + sizeof(*cmd)); + else + memcpy(&nvmeq->sq_cmds[nvmeq->sq_tail], cmd, sizeof(*cmd)); + + if (++nvmeq->sq_tail == nvmeq->q_depth) + nvmeq->sq_tail = 0; + if (nvme_dbbuf_update_and_check_event(nvmeq->sq_tail, + nvmeq->dbbuf_sq_db, nvmeq->dbbuf_sq_ei)) + writel(nvmeq->sq_tail, nvmeq->q_db); + spin_unlock(&nvmeq->sq_lock); +} + +static void **nvme_pci_iod_list(struct request *req) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + return (void **)(iod->sg + blk_rq_nr_phys_segments(req)); +} + +static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + int nseg = blk_rq_nr_phys_segments(req); + unsigned int avg_seg_size; + + if (nseg == 0) + return false; + + avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req), nseg); + + if (!(dev->ctrl.sgls & ((1 << 0) | (1 << 1)))) + return false; + if (!iod->nvmeq->qid) + return false; + if (!sgl_threshold || avg_seg_size < sgl_threshold) + return false; + return true; +} + +static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(rq); + int nseg = blk_rq_nr_phys_segments(rq); + unsigned int size = blk_rq_payload_bytes(rq); + + iod->use_sgl = nvme_pci_use_sgls(dev, rq); + + if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { + iod->sg = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); + if (!iod->sg) + return BLK_STS_RESOURCE; + } else { + iod->sg = iod->inline_sg; + } + + iod->aborted = 0; + iod->npages = -1; + iod->nents = 0; + iod->length = size; + + return BLK_STS_OK; +} + +static void nvme_free_iod(struct nvme_dev *dev, struct request *req) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + const int last_prp = dev->ctrl.page_size / sizeof(__le64) - 1; + dma_addr_t dma_addr = iod->first_dma, next_dma_addr; + + int i; + + if (iod->npages == 0) + dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], + dma_addr); + + for (i = 0; i < iod->npages; i++) { + void *addr = nvme_pci_iod_list(req)[i]; + + if (iod->use_sgl) { + struct nvme_sgl_desc *sg_list = addr; + + next_dma_addr = + le64_to_cpu((sg_list[SGES_PER_PAGE - 1]).addr); + } else { + __le64 *prp_list = addr; + + next_dma_addr = le64_to_cpu(prp_list[last_prp]); + } + + dma_pool_free(dev->prp_page_pool, addr, dma_addr); + dma_addr = next_dma_addr; + } + + if (iod->sg != iod->inline_sg) + mempool_free(iod->sg, dev->iod_mempool); +} + +static void nvme_print_sgl(struct scatterlist *sgl, int nents) +{ + int i; + struct scatterlist *sg; + + for_each_sg(sgl, sg, nents, i) { + dma_addr_t phys = sg_phys(sg); + pr_warn("sg[%d] phys_addr:%pad offset:%d length:%d " + "dma_address:%pad dma_length:%d\n", + i, &phys, sg->offset, sg->length, &sg_dma_address(sg), + sg_dma_len(sg)); + } +} + +static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, + struct request *req, struct nvme_rw_command *cmnd) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + struct dma_pool *pool; + int length = blk_rq_payload_bytes(req); + struct scatterlist *sg = iod->sg; + int dma_len = sg_dma_len(sg); + u64 dma_addr = sg_dma_address(sg); + u32 page_size = dev->ctrl.page_size; + int offset = dma_addr & (page_size - 1); + __le64 *prp_list; + void **list = nvme_pci_iod_list(req); + dma_addr_t prp_dma; + int nprps, i; + + length -= (page_size - offset); + if (length <= 0) { + iod->first_dma = 0; + goto done; + } + + dma_len -= (page_size - offset); + if (dma_len) { + dma_addr += (page_size - offset); + } else { + sg = sg_next(sg); + dma_addr = sg_dma_address(sg); + dma_len = sg_dma_len(sg); + } + + if (length <= page_size) { + iod->first_dma = dma_addr; + goto done; + } + + nprps = DIV_ROUND_UP(length, page_size); + if (nprps <= (256 / 8)) { + pool = dev->prp_small_pool; + iod->npages = 0; + } else { + pool = dev->prp_page_pool; + iod->npages = 1; + } + + prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); + if (!prp_list) { + iod->first_dma = dma_addr; + iod->npages = -1; + return BLK_STS_RESOURCE; + } + list[0] = prp_list; + iod->first_dma = prp_dma; + i = 0; + for (;;) { + if (i == page_size >> 3) { + __le64 *old_prp_list = prp_list; + prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); + if (!prp_list) + return BLK_STS_RESOURCE; + list[iod->npages++] = prp_list; + prp_list[0] = old_prp_list[i - 1]; + old_prp_list[i - 1] = cpu_to_le64(prp_dma); + i = 1; + } + prp_list[i++] = cpu_to_le64(dma_addr); + dma_len -= page_size; + dma_addr += page_size; + length -= page_size; + if (length <= 0) + break; + if (dma_len > 0) + continue; + if (unlikely(dma_len < 0)) + goto bad_sgl; + sg = sg_next(sg); + dma_addr = sg_dma_address(sg); + dma_len = sg_dma_len(sg); + } + +done: + cmnd->dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); + cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma); + + return BLK_STS_OK; + + bad_sgl: + WARN(DO_ONCE(nvme_print_sgl, iod->sg, iod->nents), + "Invalid SGL for payload:%d nents:%d\n", + blk_rq_payload_bytes(req), iod->nents); + return BLK_STS_IOERR; +} + +static void nvme_pci_sgl_set_data(struct nvme_sgl_desc *sge, + struct scatterlist *sg) +{ + sge->addr = cpu_to_le64(sg_dma_address(sg)); + sge->length = cpu_to_le32(sg_dma_len(sg)); + sge->type = NVME_SGL_FMT_DATA_DESC << 4; +} + +static void nvme_pci_sgl_set_seg(struct nvme_sgl_desc *sge, + dma_addr_t dma_addr, int entries) +{ + sge->addr = cpu_to_le64(dma_addr); + if (entries < SGES_PER_PAGE) { + sge->length = cpu_to_le32(entries * sizeof(*sge)); + sge->type = NVME_SGL_FMT_LAST_SEG_DESC << 4; + } else { + sge->length = cpu_to_le32(PAGE_SIZE); + sge->type = NVME_SGL_FMT_SEG_DESC << 4; + } +} + +static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, + struct request *req, struct nvme_rw_command *cmd, int entries) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + struct dma_pool *pool; + struct nvme_sgl_desc *sg_list; + struct scatterlist *sg = iod->sg; + dma_addr_t sgl_dma; + int i = 0; + + /* setting the transfer type as SGL */ + cmd->flags = NVME_CMD_SGL_METABUF; + + if (entries == 1) { + nvme_pci_sgl_set_data(&cmd->dptr.sgl, sg); + return BLK_STS_OK; + } + + if (entries <= (256 / sizeof(struct nvme_sgl_desc))) { + pool = dev->prp_small_pool; + iod->npages = 0; + } else { + pool = dev->prp_page_pool; + iod->npages = 1; + } + + sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); + if (!sg_list) { + iod->npages = -1; + return BLK_STS_RESOURCE; + } + + nvme_pci_iod_list(req)[0] = sg_list; + iod->first_dma = sgl_dma; + + nvme_pci_sgl_set_seg(&cmd->dptr.sgl, sgl_dma, entries); + + do { + if (i == SGES_PER_PAGE) { + struct nvme_sgl_desc *old_sg_desc = sg_list; + struct nvme_sgl_desc *link = &old_sg_desc[i - 1]; + + sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); + if (!sg_list) + return BLK_STS_RESOURCE; + + i = 0; + nvme_pci_iod_list(req)[iod->npages++] = sg_list; + sg_list[i++] = *link; + nvme_pci_sgl_set_seg(link, sgl_dma, entries); + } + + nvme_pci_sgl_set_data(&sg_list[i++], sg); + sg = sg_next(sg); + } while (--entries > 0); + + return BLK_STS_OK; +} + +static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, + struct nvme_command *cmnd) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + struct request_queue *q = req->q; + enum dma_data_direction dma_dir = rq_data_dir(req) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE; + blk_status_t ret = BLK_STS_IOERR; + int nr_mapped; + + sg_init_table(iod->sg, blk_rq_nr_phys_segments(req)); + iod->nents = blk_rq_map_sg(q, req, iod->sg); + if (!iod->nents) + goto out; + + ret = BLK_STS_RESOURCE; + nr_mapped = dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir, + DMA_ATTR_NO_WARN); + if (!nr_mapped) + goto out; + + if (iod->use_sgl) + ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw, nr_mapped); + else + ret = nvme_pci_setup_prps(dev, req, &cmnd->rw); + + if (ret != BLK_STS_OK) + goto out_unmap; + + ret = BLK_STS_IOERR; + if (blk_integrity_rq(req)) { + if (blk_rq_count_integrity_sg(q, req->bio) != 1) + goto out_unmap; + + sg_init_table(&iod->meta_sg, 1); + if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1) + goto out_unmap; + + if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir)) + goto out_unmap; + } + + if (blk_integrity_rq(req)) + cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); + return BLK_STS_OK; + +out_unmap: + dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); +out: + return ret; +} + +static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + enum dma_data_direction dma_dir = rq_data_dir(req) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE; + + if (iod->nents) { + dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); + if (blk_integrity_rq(req)) + dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); + } + + nvme_cleanup_cmd(req); + nvme_free_iod(dev, req); +} + +/* + * NOTE: ns is NULL when called on the admin queue. + */ +static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct nvme_ns *ns = hctx->queue->queuedata; + struct nvme_queue *nvmeq = hctx->driver_data; + struct nvme_dev *dev = nvmeq->dev; + struct request *req = bd->rq; + struct nvme_command cmnd; + blk_status_t ret; + + /* + * We should not need to do this, but we're still using this to + * ensure we can drain requests on a dying queue. + */ + if (unlikely(nvmeq->cq_vector < 0)) + return BLK_STS_IOERR; + + ret = nvme_setup_cmd(ns, req, &cmnd); + if (ret) + return ret; + + ret = nvme_init_iod(req, dev); + if (ret) + goto out_free_cmd; + + if (blk_rq_nr_phys_segments(req)) { + ret = nvme_map_data(dev, req, &cmnd); + if (ret) + goto out_cleanup_iod; + } + + blk_mq_start_request(req); + nvme_submit_cmd(nvmeq, &cmnd); + return BLK_STS_OK; +out_cleanup_iod: + nvme_free_iod(dev, req); +out_free_cmd: + nvme_cleanup_cmd(req); + return ret; +} + +static void nvme_pci_complete_rq(struct request *req) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + + nvme_unmap_data(iod->nvmeq->dev, req); + nvme_complete_rq(req); +} + +/* We read the CQE phase first to check if the rest of the entry is valid */ +static inline bool nvme_cqe_pending(struct nvme_queue *nvmeq) +{ + return (le16_to_cpu(nvmeq->cqes[nvmeq->cq_head].status) & 1) == + nvmeq->cq_phase; +} + +static inline void nvme_ring_cq_doorbell(struct nvme_queue *nvmeq) +{ + u16 head = nvmeq->cq_head; + + if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db, + nvmeq->dbbuf_cq_ei)) + writel(head, nvmeq->q_db + nvmeq->dev->db_stride); +} + +static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, u16 idx) +{ + volatile struct nvme_completion *cqe = &nvmeq->cqes[idx]; + struct request *req; + + if (unlikely(cqe->command_id >= nvmeq->q_depth)) { + dev_warn(nvmeq->dev->ctrl.device, + "invalid id %d completed on queue %d\n", + cqe->command_id, le16_to_cpu(cqe->sq_id)); + return; + } + + /* + * AEN requests are special as they don't time out and can + * survive any kind of queue freeze and often don't respond to + * aborts. We don't even bother to allocate a struct request + * for them but rather special case them here. + */ + if (unlikely(nvmeq->qid == 0 && + cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { + nvme_complete_async_event(&nvmeq->dev->ctrl, + cqe->status, &cqe->result); + return; + } + + req = blk_mq_tag_to_rq(*nvmeq->tags, cqe->command_id); + nvme_end_request(req, cqe->status, cqe->result); +} + +static void nvme_complete_cqes(struct nvme_queue *nvmeq, u16 start, u16 end) +{ + while (start != end) { + nvme_handle_cqe(nvmeq, start); + if (++start == nvmeq->q_depth) + start = 0; + } +} + +static inline void nvme_update_cq_head(struct nvme_queue *nvmeq) +{ + if (nvmeq->cq_head == nvmeq->q_depth - 1) { + nvmeq->cq_head = 0; + nvmeq->cq_phase = !nvmeq->cq_phase; + } else { + nvmeq->cq_head++; + } +} + +static inline bool nvme_process_cq(struct nvme_queue *nvmeq, u16 *start, + u16 *end, int tag) +{ + bool found = false; + + *start = nvmeq->cq_head; + while (!found && nvme_cqe_pending(nvmeq)) { + if (nvmeq->cqes[nvmeq->cq_head].command_id == tag) + found = true; + nvme_update_cq_head(nvmeq); + } + *end = nvmeq->cq_head; + + if (*start != *end) + nvme_ring_cq_doorbell(nvmeq); + return found; +} + +static irqreturn_t nvme_irq(int irq, void *data) +{ + struct nvme_queue *nvmeq = data; + irqreturn_t ret = IRQ_NONE; + u16 start, end; + + spin_lock(&nvmeq->cq_lock); + if (nvmeq->cq_head != nvmeq->last_cq_head) + ret = IRQ_HANDLED; + nvme_process_cq(nvmeq, &start, &end, -1); + nvmeq->last_cq_head = nvmeq->cq_head; + spin_unlock(&nvmeq->cq_lock); + + if (start != end) { + nvme_complete_cqes(nvmeq, start, end); + return IRQ_HANDLED; + } + + return ret; +} + +static irqreturn_t nvme_irq_check(int irq, void *data) +{ + struct nvme_queue *nvmeq = data; + if (nvme_cqe_pending(nvmeq)) + return IRQ_WAKE_THREAD; + return IRQ_NONE; +} + +static int __nvme_poll(struct nvme_queue *nvmeq, unsigned int tag) +{ + u16 start, end; + bool found; + + if (!nvme_cqe_pending(nvmeq)) + return 0; + + spin_lock_irq(&nvmeq->cq_lock); + found = nvme_process_cq(nvmeq, &start, &end, tag); + spin_unlock_irq(&nvmeq->cq_lock); + + nvme_complete_cqes(nvmeq, start, end); + return found; +} + +static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) +{ + struct nvme_queue *nvmeq = hctx->driver_data; + + return __nvme_poll(nvmeq, tag); +} + +static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl) +{ + struct nvme_dev *dev = to_nvme_dev(ctrl); + struct nvme_queue *nvmeq = &dev->queues[0]; + struct nvme_command c; + + memset(&c, 0, sizeof(c)); + c.common.opcode = nvme_admin_async_event; + c.common.command_id = NVME_AQ_BLK_MQ_DEPTH; + nvme_submit_cmd(nvmeq, &c); +} + +static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) +{ + struct nvme_command c; + + memset(&c, 0, sizeof(c)); + c.delete_queue.opcode = opcode; + c.delete_queue.qid = cpu_to_le16(id); + + return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); +} + +static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, + struct nvme_queue *nvmeq, s16 vector) +{ + struct nvme_command c; + int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; + + /* + * Note: we (ab)use the fact that the prp fields survive if no data + * is attached to the request. + */ + memset(&c, 0, sizeof(c)); + c.create_cq.opcode = nvme_admin_create_cq; + c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); + c.create_cq.cqid = cpu_to_le16(qid); + c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); + c.create_cq.cq_flags = cpu_to_le16(flags); + c.create_cq.irq_vector = cpu_to_le16(vector); + + return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); +} + +static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, + struct nvme_queue *nvmeq) +{ + struct nvme_ctrl *ctrl = &dev->ctrl; + struct nvme_command c; + int flags = NVME_QUEUE_PHYS_CONTIG; + + /* + * Some drives have a bug that auto-enables WRRU if MEDIUM isn't + * set. Since URGENT priority is zeroes, it makes all queues + * URGENT. + */ + if (ctrl->quirks & NVME_QUIRK_MEDIUM_PRIO_SQ) + flags |= NVME_SQ_PRIO_MEDIUM; + + /* + * Note: we (ab)use the fact that the prp fields survive if no data + * is attached to the request. + */ + memset(&c, 0, sizeof(c)); + c.create_sq.opcode = nvme_admin_create_sq; + c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); + c.create_sq.sqid = cpu_to_le16(qid); + c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); + c.create_sq.sq_flags = cpu_to_le16(flags); + c.create_sq.cqid = cpu_to_le16(qid); + + return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); +} + +static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) +{ + return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); +} + +static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) +{ + return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); +} + +static void abort_endio(struct request *req, blk_status_t error) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + struct nvme_queue *nvmeq = iod->nvmeq; + + dev_warn(nvmeq->dev->ctrl.device, + "Abort status: 0x%x", nvme_req(req)->status); + atomic_inc(&nvmeq->dev->ctrl.abort_limit); + blk_mq_free_request(req); +} + +static bool nvme_should_reset(struct nvme_dev *dev, u32 csts) +{ + + /* If true, indicates loss of adapter communication, possibly by a + * NVMe Subsystem reset. + */ + bool nssro = dev->subsystem && (csts & NVME_CSTS_NSSRO); + + /* If there is a reset/reinit ongoing, we shouldn't reset again. */ + switch (dev->ctrl.state) { + case NVME_CTRL_RESETTING: + case NVME_CTRL_CONNECTING: + return false; + default: + break; + } + + /* We shouldn't reset unless the controller is on fatal error state + * _or_ if we lost the communication with it. + */ + if (!(csts & NVME_CSTS_CFS) && !nssro) + return false; + + return true; +} + +static void nvme_warn_reset(struct nvme_dev *dev, u32 csts) +{ + /* Read a config register to help see what died. */ + u16 pci_status; + int result; + + result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS, + &pci_status); + if (result == PCIBIOS_SUCCESSFUL) + dev_warn(dev->ctrl.device, + "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n", + csts, pci_status); + else + dev_warn(dev->ctrl.device, + "controller is down; will reset: CSTS=0x%x, PCI_STATUS read failed (%d)\n", + csts, result); +} + +static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + struct nvme_queue *nvmeq = iod->nvmeq; + struct nvme_dev *dev = nvmeq->dev; + struct request *abort_req; + struct nvme_command cmd; + bool shutdown = false; + u32 csts = readl(dev->bar + NVME_REG_CSTS); + + /* If PCI error recovery process is happening, we cannot reset or + * the recovery mechanism will surely fail. + */ + mb(); + if (pci_channel_offline(to_pci_dev(dev->dev))) + return BLK_EH_RESET_TIMER; + + /* + * Reset immediately if the controller is failed + */ + if (nvme_should_reset(dev, csts)) { + nvme_warn_reset(dev, csts); + nvme_dev_disable(dev, false); + nvme_reset_ctrl(&dev->ctrl); + return BLK_EH_DONE; + } + + /* + * Did we miss an interrupt? + */ + if (__nvme_poll(nvmeq, req->tag)) { + dev_warn(dev->ctrl.device, + "I/O %d QID %d timeout, completion polled\n", + req->tag, nvmeq->qid); + return BLK_EH_DONE; + } + + /* + * Shutdown immediately if controller times out while starting. The + * reset work will see the pci device disabled when it gets the forced + * cancellation error. All outstanding requests are completed on + * shutdown, so we return BLK_EH_DONE. + */ + switch (dev->ctrl.state) { + case NVME_CTRL_DELETING: + shutdown = true; + case NVME_CTRL_CONNECTING: + case NVME_CTRL_RESETTING: + dev_warn_ratelimited(dev->ctrl.device, + "I/O %d QID %d timeout, disable controller\n", + req->tag, nvmeq->qid); + nvme_dev_disable(dev, shutdown); + nvme_req(req)->flags |= NVME_REQ_CANCELLED; + return BLK_EH_DONE; + default: + break; + } + + /* + * Shutdown the controller immediately and schedule a reset if the + * command was already aborted once before and still hasn't been + * returned to the driver, or if this is the admin queue. + */ + if (!nvmeq->qid || iod->aborted) { + dev_warn(dev->ctrl.device, + "I/O %d QID %d timeout, reset controller\n", + req->tag, nvmeq->qid); + nvme_dev_disable(dev, false); + nvme_reset_ctrl(&dev->ctrl); + + nvme_req(req)->flags |= NVME_REQ_CANCELLED; + return BLK_EH_DONE; + } + + if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) { + atomic_inc(&dev->ctrl.abort_limit); + return BLK_EH_RESET_TIMER; + } + iod->aborted = 1; + + memset(&cmd, 0, sizeof(cmd)); + cmd.abort.opcode = nvme_admin_abort_cmd; + cmd.abort.cid = req->tag; + cmd.abort.sqid = cpu_to_le16(nvmeq->qid); + + dev_warn(nvmeq->dev->ctrl.device, + "I/O %d QID %d timeout, aborting\n", + req->tag, nvmeq->qid); + + abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd, + BLK_MQ_REQ_NOWAIT, NVME_QID_ANY); + if (IS_ERR(abort_req)) { + atomic_inc(&dev->ctrl.abort_limit); + return BLK_EH_RESET_TIMER; + } + + abort_req->timeout = ADMIN_TIMEOUT; + abort_req->end_io_data = NULL; + blk_execute_rq_nowait(abort_req->q, NULL, abort_req, 0, abort_endio); + + /* + * The aborted req will be completed on receiving the abort req. + * We enable the timer again. If hit twice, it'll cause a device reset, + * as the device then is in a faulty state. + */ + return BLK_EH_RESET_TIMER; +} + +static void nvme_free_queue(struct nvme_queue *nvmeq) +{ + dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), + (void *)nvmeq->cqes, nvmeq->cq_dma_addr); + if (nvmeq->sq_cmds) + dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), + nvmeq->sq_cmds, nvmeq->sq_dma_addr); +} + +static void nvme_free_queues(struct nvme_dev *dev, int lowest) +{ + int i; + + for (i = dev->ctrl.queue_count - 1; i >= lowest; i--) { + dev->ctrl.queue_count--; + nvme_free_queue(&dev->queues[i]); + } +} + +/** + * nvme_suspend_queue - put queue into suspended state + * @nvmeq - queue to suspend + */ +static int nvme_suspend_queue(struct nvme_queue *nvmeq) +{ + int vector; + + spin_lock_irq(&nvmeq->cq_lock); + if (nvmeq->cq_vector == -1) { + spin_unlock_irq(&nvmeq->cq_lock); + return 1; + } + vector = nvmeq->cq_vector; + nvmeq->dev->online_queues--; + nvmeq->cq_vector = -1; + spin_unlock_irq(&nvmeq->cq_lock); + + /* + * Ensure that nvme_queue_rq() sees it ->cq_vector == -1 without + * having to grab the lock. + */ + mb(); + + if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) + blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q); + + pci_free_irq(to_pci_dev(nvmeq->dev->dev), vector, nvmeq); + + return 0; +} + +static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown) +{ + struct nvme_queue *nvmeq = &dev->queues[0]; + u16 start, end; + + if (shutdown) + nvme_shutdown_ctrl(&dev->ctrl); + else + nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap); + + spin_lock_irq(&nvmeq->cq_lock); + nvme_process_cq(nvmeq, &start, &end, -1); + spin_unlock_irq(&nvmeq->cq_lock); + + nvme_complete_cqes(nvmeq, start, end); +} + +static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, + int entry_size) +{ + int q_depth = dev->q_depth; + unsigned q_size_aligned = roundup(q_depth * entry_size, + dev->ctrl.page_size); + + if (q_size_aligned * nr_io_queues > dev->cmb_size) { + u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); + mem_per_q = round_down(mem_per_q, dev->ctrl.page_size); + q_depth = div_u64(mem_per_q, entry_size); + + /* + * Ensure the reduced q_depth is above some threshold where it + * would be better to map queues in system memory with the + * original depth + */ + if (q_depth < 64) + return -ENOMEM; + } + + return q_depth; +} + +static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, + int qid, int depth) +{ + /* CMB SQEs will be mapped before creation */ + if (qid && dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) + return 0; + + nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), + &nvmeq->sq_dma_addr, GFP_KERNEL); + if (!nvmeq->sq_cmds) + return -ENOMEM; + return 0; +} + +static int nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth) +{ + struct nvme_queue *nvmeq = &dev->queues[qid]; + + if (dev->ctrl.queue_count > qid) + return 0; + + nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), + &nvmeq->cq_dma_addr, GFP_KERNEL); + if (!nvmeq->cqes) + goto free_nvmeq; + + if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) + goto free_cqdma; + + nvmeq->q_dmadev = dev->dev; + nvmeq->dev = dev; + spin_lock_init(&nvmeq->sq_lock); + spin_lock_init(&nvmeq->cq_lock); + nvmeq->cq_head = 0; + nvmeq->cq_phase = 1; + nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; + nvmeq->q_depth = depth; + nvmeq->qid = qid; + nvmeq->cq_vector = -1; + dev->ctrl.queue_count++; + + return 0; + + free_cqdma: + dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, + nvmeq->cq_dma_addr); + free_nvmeq: + return -ENOMEM; +} + +static int queue_request_irq(struct nvme_queue *nvmeq) +{ + struct pci_dev *pdev = to_pci_dev(nvmeq->dev->dev); + int nr = nvmeq->dev->ctrl.instance; + + if (use_threaded_interrupts) { + return pci_request_irq(pdev, nvmeq->cq_vector, nvme_irq_check, + nvme_irq, nvmeq, "nvme%dq%d", nr, nvmeq->qid); + } else { + return pci_request_irq(pdev, nvmeq->cq_vector, nvme_irq, + NULL, nvmeq, "nvme%dq%d", nr, nvmeq->qid); + } +} + +static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) +{ + struct nvme_dev *dev = nvmeq->dev; + + spin_lock_irq(&nvmeq->cq_lock); + nvmeq->sq_tail = 0; + nvmeq->cq_head = 0; + nvmeq->cq_phase = 1; + nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; + memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); + nvme_dbbuf_init(dev, nvmeq, qid); + dev->online_queues++; + spin_unlock_irq(&nvmeq->cq_lock); +} + +static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) +{ + struct nvme_dev *dev = nvmeq->dev; + int result; + s16 vector; + + if (dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) { + unsigned offset = (qid - 1) * roundup(SQ_SIZE(nvmeq->q_depth), + dev->ctrl.page_size); + nvmeq->sq_dma_addr = dev->cmb_bus_addr + offset; + nvmeq->sq_cmds_io = dev->cmb + offset; + } + + /* + * A queue's vector matches the queue identifier unless the controller + * has only one vector available. + */ + vector = dev->num_vecs == 1 ? 0 : qid; + result = adapter_alloc_cq(dev, qid, nvmeq, vector); + if (result) + return result; + + result = adapter_alloc_sq(dev, qid, nvmeq); + if (result < 0) + return result; + else if (result) + goto release_cq; + + /* + * Set cq_vector after alloc cq/sq, otherwise nvme_suspend_queue will + * invoke free_irq for it and cause a 'Trying to free already-free IRQ + * xxx' warning if the create CQ/SQ command times out. + */ + nvmeq->cq_vector = vector; + nvme_init_queue(nvmeq, qid); + result = queue_request_irq(nvmeq); + if (result < 0) + goto release_sq; + + return result; + +release_sq: + nvmeq->cq_vector = -1; + dev->online_queues--; + adapter_delete_sq(dev, qid); +release_cq: + adapter_delete_cq(dev, qid); + return result; +} + +static const struct blk_mq_ops nvme_mq_admin_ops = { + .queue_rq = nvme_queue_rq, + .complete = nvme_pci_complete_rq, + .init_hctx = nvme_admin_init_hctx, + .exit_hctx = nvme_admin_exit_hctx, + .init_request = nvme_init_request, + .timeout = nvme_timeout, +}; + +static const struct blk_mq_ops nvme_mq_ops = { + .queue_rq = nvme_queue_rq, + .complete = nvme_pci_complete_rq, + .init_hctx = nvme_init_hctx, + .init_request = nvme_init_request, + .map_queues = nvme_pci_map_queues, + .timeout = nvme_timeout, + .poll = nvme_poll, +}; + +static void nvme_dev_remove_admin(struct nvme_dev *dev) +{ + if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) { + /* + * If the controller was reset during removal, it's possible + * user requests may be waiting on a stopped queue. Start the + * queue to flush these to completion. + */ + blk_mq_unquiesce_queue(dev->ctrl.admin_q); + blk_cleanup_queue(dev->ctrl.admin_q); + blk_mq_free_tag_set(&dev->admin_tagset); + } +} + +static int nvme_alloc_admin_tags(struct nvme_dev *dev) +{ + if (!dev->ctrl.admin_q) { + dev->admin_tagset.ops = &nvme_mq_admin_ops; + dev->admin_tagset.nr_hw_queues = 1; + + dev->admin_tagset.queue_depth = NVME_AQ_MQ_TAG_DEPTH; + dev->admin_tagset.timeout = ADMIN_TIMEOUT; + dev->admin_tagset.numa_node = dev_to_node(dev->dev); + dev->admin_tagset.cmd_size = nvme_pci_cmd_size(dev, false); + dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED; + dev->admin_tagset.driver_data = dev; + + if (blk_mq_alloc_tag_set(&dev->admin_tagset)) + return -ENOMEM; + dev->ctrl.admin_tagset = &dev->admin_tagset; + + dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); + if (IS_ERR(dev->ctrl.admin_q)) { + blk_mq_free_tag_set(&dev->admin_tagset); + dev->ctrl.admin_q = NULL; + return -ENOMEM; + } + if (!blk_get_queue(dev->ctrl.admin_q)) { + nvme_dev_remove_admin(dev); + dev->ctrl.admin_q = NULL; + return -ENODEV; + } + } else + blk_mq_unquiesce_queue(dev->ctrl.admin_q); + + return 0; +} + +static unsigned long db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) +{ + return NVME_REG_DBS + ((nr_io_queues + 1) * 8 * dev->db_stride); +} + +static int nvme_remap_bar(struct nvme_dev *dev, unsigned long size) +{ + struct pci_dev *pdev = to_pci_dev(dev->dev); + + if (size <= dev->bar_mapped_size) + return 0; + if (size > pci_resource_len(pdev, 0)) + return -ENOMEM; + if (dev->bar) + iounmap(dev->bar); + dev->bar = ioremap(pci_resource_start(pdev, 0), size); + if (!dev->bar) { + dev->bar_mapped_size = 0; + return -ENOMEM; + } + dev->bar_mapped_size = size; + dev->dbs = dev->bar + NVME_REG_DBS; + + return 0; +} + +static int nvme_pci_configure_admin_queue(struct nvme_dev *dev) +{ + int result; + u32 aqa; + struct nvme_queue *nvmeq; + + result = nvme_remap_bar(dev, db_bar_size(dev, 0)); + if (result < 0) + return result; + + dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1, 0) ? + NVME_CAP_NSSRC(dev->ctrl.cap) : 0; + + if (dev->subsystem && + (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO)) + writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS); + + result = nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap); + if (result < 0) + return result; + + result = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH); + if (result) + return result; + + nvmeq = &dev->queues[0]; + aqa = nvmeq->q_depth - 1; + aqa |= aqa << 16; + + writel(aqa, dev->bar + NVME_REG_AQA); + lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ); + lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ); + + result = nvme_enable_ctrl(&dev->ctrl, dev->ctrl.cap); + if (result) + return result; + + nvmeq->cq_vector = 0; + nvme_init_queue(nvmeq, 0); + result = queue_request_irq(nvmeq); + if (result) { + nvmeq->cq_vector = -1; + return result; + } + + return result; +} + +static int nvme_create_io_queues(struct nvme_dev *dev) +{ + unsigned i, max; + int ret = 0; + + for (i = dev->ctrl.queue_count; i <= dev->max_qid; i++) { + if (nvme_alloc_queue(dev, i, dev->q_depth)) { + ret = -ENOMEM; + break; + } + } + + max = min(dev->max_qid, dev->ctrl.queue_count - 1); + for (i = dev->online_queues; i <= max; i++) { + ret = nvme_create_queue(&dev->queues[i], i); + if (ret) + break; + } + + /* + * Ignore failing Create SQ/CQ commands, we can continue with less + * than the desired amount of queues, and even a controller without + * I/O queues can still be used to issue admin commands. This might + * be useful to upgrade a buggy firmware for example. + */ + return ret >= 0 ? 0 : ret; +} + +static ssize_t nvme_cmb_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct nvme_dev *ndev = to_nvme_dev(dev_get_drvdata(dev)); + + return scnprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz : x%08x\n", + ndev->cmbloc, ndev->cmbsz); +} +static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL); + +static u64 nvme_cmb_size_unit(struct nvme_dev *dev) +{ + u8 szu = (dev->cmbsz >> NVME_CMBSZ_SZU_SHIFT) & NVME_CMBSZ_SZU_MASK; + + return 1ULL << (12 + 4 * szu); +} + +static u32 nvme_cmb_size(struct nvme_dev *dev) +{ + return (dev->cmbsz >> NVME_CMBSZ_SZ_SHIFT) & NVME_CMBSZ_SZ_MASK; +} + +static void nvme_map_cmb(struct nvme_dev *dev) +{ + u64 size, offset; + resource_size_t bar_size; + struct pci_dev *pdev = to_pci_dev(dev->dev); + int bar; + + if (dev->cmb_size) + return; + + dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); + if (!dev->cmbsz) + return; + dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC); + + if (!use_cmb_sqes) + return; + + size = nvme_cmb_size_unit(dev) * nvme_cmb_size(dev); + offset = nvme_cmb_size_unit(dev) * NVME_CMB_OFST(dev->cmbloc); + bar = NVME_CMB_BIR(dev->cmbloc); + bar_size = pci_resource_len(pdev, bar); + + if (offset > bar_size) + return; + + /* + * Controllers may support a CMB size larger than their BAR, + * for example, due to being behind a bridge. Reduce the CMB to + * the reported size of the BAR + */ + if (size > bar_size - offset) + size = bar_size - offset; + + dev->cmb = ioremap_wc(pci_resource_start(pdev, bar) + offset, size); + if (!dev->cmb) + return; + dev->cmb_bus_addr = pci_bus_address(pdev, bar) + offset; + dev->cmb_size = size; + + if (sysfs_add_file_to_group(&dev->ctrl.device->kobj, + &dev_attr_cmb.attr, NULL)) + dev_warn(dev->ctrl.device, + "failed to add sysfs attribute for CMB\n"); +} + +static inline void nvme_release_cmb(struct nvme_dev *dev) +{ + if (dev->cmb) { + iounmap(dev->cmb); + dev->cmb = NULL; + sysfs_remove_file_from_group(&dev->ctrl.device->kobj, + &dev_attr_cmb.attr, NULL); + dev->cmbsz = 0; + } +} + +static int nvme_set_host_mem(struct nvme_dev *dev, u32 bits) +{ + u64 dma_addr = dev->host_mem_descs_dma; + struct nvme_command c; + int ret; + + memset(&c, 0, sizeof(c)); + c.features.opcode = nvme_admin_set_features; + c.features.fid = cpu_to_le32(NVME_FEAT_HOST_MEM_BUF); + c.features.dword11 = cpu_to_le32(bits); + c.features.dword12 = cpu_to_le32(dev->host_mem_size >> + ilog2(dev->ctrl.page_size)); + c.features.dword13 = cpu_to_le32(lower_32_bits(dma_addr)); + c.features.dword14 = cpu_to_le32(upper_32_bits(dma_addr)); + c.features.dword15 = cpu_to_le32(dev->nr_host_mem_descs); + + ret = nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); + if (ret) { + dev_warn(dev->ctrl.device, + "failed to set host mem (err %d, flags %#x).\n", + ret, bits); + } + return ret; +} + +static void nvme_free_host_mem(struct nvme_dev *dev) +{ + int i; + + for (i = 0; i < dev->nr_host_mem_descs; i++) { + struct nvme_host_mem_buf_desc *desc = &dev->host_mem_descs[i]; + size_t size = le32_to_cpu(desc->size) * dev->ctrl.page_size; + + dma_free_attrs(dev->dev, size, dev->host_mem_desc_bufs[i], + le64_to_cpu(desc->addr), + DMA_ATTR_NO_KERNEL_MAPPING | DMA_ATTR_NO_WARN); + } + + kfree(dev->host_mem_desc_bufs); + dev->host_mem_desc_bufs = NULL; + dma_free_coherent(dev->dev, + dev->nr_host_mem_descs * sizeof(*dev->host_mem_descs), + dev->host_mem_descs, dev->host_mem_descs_dma); + dev->host_mem_descs = NULL; + dev->nr_host_mem_descs = 0; +} + +static int __nvme_alloc_host_mem(struct nvme_dev *dev, u64 preferred, + u32 chunk_size) +{ + struct nvme_host_mem_buf_desc *descs; + u32 max_entries, len; + dma_addr_t descs_dma; + int i = 0; + void **bufs; + u64 size, tmp; + + tmp = (preferred + chunk_size - 1); + do_div(tmp, chunk_size); + max_entries = tmp; + + if (dev->ctrl.hmmaxd && dev->ctrl.hmmaxd < max_entries) + max_entries = dev->ctrl.hmmaxd; + + descs = dma_zalloc_coherent(dev->dev, max_entries * sizeof(*descs), + &descs_dma, GFP_KERNEL); + if (!descs) + goto out; + + bufs = kcalloc(max_entries, sizeof(*bufs), GFP_KERNEL); + if (!bufs) + goto out_free_descs; + + for (size = 0; size < preferred && i < max_entries; size += len) { + dma_addr_t dma_addr; + + len = min_t(u64, chunk_size, preferred - size); + bufs[i] = dma_alloc_attrs(dev->dev, len, &dma_addr, GFP_KERNEL, + DMA_ATTR_NO_KERNEL_MAPPING | DMA_ATTR_NO_WARN); + if (!bufs[i]) + break; + + descs[i].addr = cpu_to_le64(dma_addr); + descs[i].size = cpu_to_le32(len / dev->ctrl.page_size); + i++; + } + + if (!size) + goto out_free_bufs; + + dev->nr_host_mem_descs = i; + dev->host_mem_size = size; + dev->host_mem_descs = descs; + dev->host_mem_descs_dma = descs_dma; + dev->host_mem_desc_bufs = bufs; + return 0; + +out_free_bufs: + while (--i >= 0) { + size_t size = le32_to_cpu(descs[i].size) * dev->ctrl.page_size; + + dma_free_attrs(dev->dev, size, bufs[i], + le64_to_cpu(descs[i].addr), + DMA_ATTR_NO_KERNEL_MAPPING | DMA_ATTR_NO_WARN); + } + + kfree(bufs); +out_free_descs: + dma_free_coherent(dev->dev, max_entries * sizeof(*descs), descs, + descs_dma); +out: + dev->host_mem_descs = NULL; + return -ENOMEM; +} + +static int nvme_alloc_host_mem(struct nvme_dev *dev, u64 min, u64 preferred) +{ + u32 chunk_size; + + /* start big and work our way down */ + for (chunk_size = min_t(u64, preferred, PAGE_SIZE * MAX_ORDER_NR_PAGES); + chunk_size >= max_t(u32, dev->ctrl.hmminds * 4096, PAGE_SIZE * 2); + chunk_size /= 2) { + if (!__nvme_alloc_host_mem(dev, preferred, chunk_size)) { + if (!min || dev->host_mem_size >= min) + return 0; + nvme_free_host_mem(dev); + } + } + + return -ENOMEM; +} + +static int nvme_setup_host_mem(struct nvme_dev *dev) +{ + u64 max = (u64)max_host_mem_size_mb * SZ_1M; + u64 preferred = (u64)dev->ctrl.hmpre * 4096; + u64 min = (u64)dev->ctrl.hmmin * 4096; + u32 enable_bits = NVME_HOST_MEM_ENABLE; + int ret; + + preferred = min(preferred, max); + if (min > max) { + dev_warn(dev->ctrl.device, + "min host memory (%lld MiB) above limit (%d MiB).\n", + min >> ilog2(SZ_1M), max_host_mem_size_mb); + nvme_free_host_mem(dev); + return 0; + } + + /* + * If we already have a buffer allocated check if we can reuse it. + */ + if (dev->host_mem_descs) { + if (dev->host_mem_size >= min) + enable_bits |= NVME_HOST_MEM_RETURN; + else + nvme_free_host_mem(dev); + } + + if (!dev->host_mem_descs) { + if (nvme_alloc_host_mem(dev, min, preferred)) { + dev_warn(dev->ctrl.device, + "failed to allocate host memory buffer.\n"); + return 0; /* controller must work without HMB */ + } + + dev_info(dev->ctrl.device, + "allocated %lld MiB host memory buffer.\n", + dev->host_mem_size >> ilog2(SZ_1M)); + } + + ret = nvme_set_host_mem(dev, enable_bits); + if (ret) + nvme_free_host_mem(dev); + return ret; +} + +static int nvme_setup_io_queues(struct nvme_dev *dev) +{ + struct nvme_queue *adminq = &dev->queues[0]; + struct pci_dev *pdev = to_pci_dev(dev->dev); + int result, nr_io_queues; + unsigned long size; + + struct irq_affinity affd = { + .pre_vectors = 1 + }; + + nr_io_queues = num_possible_cpus(); + result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues); + if (result < 0) + return result; + + if (nr_io_queues == 0) + return 0; + + if (dev->cmb && (dev->cmbsz & NVME_CMBSZ_SQS)) { + result = nvme_cmb_qdepth(dev, nr_io_queues, + sizeof(struct nvme_command)); + if (result > 0) + dev->q_depth = result; + else + nvme_release_cmb(dev); + } + + do { + size = db_bar_size(dev, nr_io_queues); + result = nvme_remap_bar(dev, size); + if (!result) + break; + if (!--nr_io_queues) + return -ENOMEM; + } while (1); + adminq->q_db = dev->dbs; + + /* Deregister the admin queue's interrupt */ + pci_free_irq(pdev, 0, adminq); + + /* + * If we enable msix early due to not intx, disable it again before + * setting up the full range we need. + */ + pci_free_irq_vectors(pdev); + result = pci_alloc_irq_vectors_affinity(pdev, 1, nr_io_queues + 1, + PCI_IRQ_ALL_TYPES | PCI_IRQ_AFFINITY, &affd); + if (result <= 0) + return -EIO; + dev->num_vecs = result; + dev->max_qid = max(result - 1, 1); + + /* + * Should investigate if there's a performance win from allocating + * more queues than interrupt vectors; it might allow the submission + * path to scale better, even if the receive path is limited by the + * number of interrupts. + */ + + result = queue_request_irq(adminq); + if (result) { + adminq->cq_vector = -1; + return result; + } + return nvme_create_io_queues(dev); +} + +static void nvme_del_queue_end(struct request *req, blk_status_t error) +{ + struct nvme_queue *nvmeq = req->end_io_data; + + blk_mq_free_request(req); + complete(&nvmeq->dev->ioq_wait); +} + +static void nvme_del_cq_end(struct request *req, blk_status_t error) +{ + struct nvme_queue *nvmeq = req->end_io_data; + u16 start, end; + + if (!error) { + unsigned long flags; + + spin_lock_irqsave(&nvmeq->cq_lock, flags); + nvme_process_cq(nvmeq, &start, &end, -1); + spin_unlock_irqrestore(&nvmeq->cq_lock, flags); + + nvme_complete_cqes(nvmeq, start, end); + } + + nvme_del_queue_end(req, error); +} + +static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode) +{ + struct request_queue *q = nvmeq->dev->ctrl.admin_q; + struct request *req; + struct nvme_command cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.delete_queue.opcode = opcode; + cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid); + + req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT, NVME_QID_ANY); + if (IS_ERR(req)) + return PTR_ERR(req); + + req->timeout = ADMIN_TIMEOUT; + req->end_io_data = nvmeq; + + blk_execute_rq_nowait(q, NULL, req, false, + opcode == nvme_admin_delete_cq ? + nvme_del_cq_end : nvme_del_queue_end); + return 0; +} + +static void nvme_disable_io_queues(struct nvme_dev *dev) +{ + int pass, queues = dev->online_queues - 1; + unsigned long timeout; + u8 opcode = nvme_admin_delete_sq; + + for (pass = 0; pass < 2; pass++) { + int sent = 0, i = queues; + + reinit_completion(&dev->ioq_wait); + retry: + timeout = ADMIN_TIMEOUT; + for (; i > 0; i--, sent++) + if (nvme_delete_queue(&dev->queues[i], opcode)) + break; + + while (sent--) { + timeout = wait_for_completion_io_timeout(&dev->ioq_wait, timeout); + if (timeout == 0) + return; + if (i) + goto retry; + } + opcode = nvme_admin_delete_cq; + } +} + +/* + * return error value only when tagset allocation failed + */ +static int nvme_dev_add(struct nvme_dev *dev) +{ + int ret; + + if (!dev->ctrl.tagset) { + dev->tagset.ops = &nvme_mq_ops; + dev->tagset.nr_hw_queues = dev->online_queues - 1; + dev->tagset.timeout = NVME_IO_TIMEOUT; + dev->tagset.numa_node = dev_to_node(dev->dev); + dev->tagset.queue_depth = + min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; + dev->tagset.cmd_size = nvme_pci_cmd_size(dev, false); + if ((dev->ctrl.sgls & ((1 << 0) | (1 << 1))) && sgl_threshold) { + dev->tagset.cmd_size = max(dev->tagset.cmd_size, + nvme_pci_cmd_size(dev, true)); + } + dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; + dev->tagset.driver_data = dev; + + ret = blk_mq_alloc_tag_set(&dev->tagset); + if (ret) { + dev_warn(dev->ctrl.device, + "IO queues tagset allocation failed %d\n", ret); + return ret; + } + dev->ctrl.tagset = &dev->tagset; + + nvme_dbbuf_set(dev); + } else { + blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1); + + /* Free previously allocated queues that are no longer usable */ + nvme_free_queues(dev, dev->online_queues); + } + + return 0; +} + +static int nvme_pci_enable(struct nvme_dev *dev) +{ + int result = -ENOMEM; + struct pci_dev *pdev = to_pci_dev(dev->dev); + + if (pci_enable_device_mem(pdev)) + return result; + + pci_set_master(pdev); + + if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && + dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) + goto disable; + + if (readl(dev->bar + NVME_REG_CSTS) == -1) { + result = -ENODEV; + goto disable; + } + + /* + * Some devices and/or platforms don't advertise or work with INTx + * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll + * adjust this later. + */ + result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); + if (result < 0) + return result; + + dev->ctrl.cap = lo_hi_readq(dev->bar + NVME_REG_CAP); + + dev->q_depth = min_t(int, NVME_CAP_MQES(dev->ctrl.cap) + 1, + io_queue_depth); + dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap); + dev->dbs = dev->bar + 4096; + + /* + * Temporary fix for the Apple controller found in the MacBook8,1 and + * some MacBook7,1 to avoid controller resets and data loss. + */ + if (pdev->vendor == PCI_VENDOR_ID_APPLE && pdev->device == 0x2001) { + dev->q_depth = 2; + dev_warn(dev->ctrl.device, "detected Apple NVMe controller, " + "set queue depth=%u to work around controller resets\n", + dev->q_depth); + } else if (pdev->vendor == PCI_VENDOR_ID_SAMSUNG && + (pdev->device == 0xa821 || pdev->device == 0xa822) && + NVME_CAP_MQES(dev->ctrl.cap) == 0) { + dev->q_depth = 64; + dev_err(dev->ctrl.device, "detected PM1725 NVMe controller, " + "set queue depth=%u\n", dev->q_depth); + } + + nvme_map_cmb(dev); + + pci_enable_pcie_error_reporting(pdev); + pci_save_state(pdev); + return 0; + + disable: + pci_disable_device(pdev); + return result; +} + +static void nvme_dev_unmap(struct nvme_dev *dev) +{ + if (dev->bar) + iounmap(dev->bar); + pci_release_mem_regions(to_pci_dev(dev->dev)); +} + +static void nvme_pci_disable(struct nvme_dev *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev->dev); + + pci_free_irq_vectors(pdev); + + if (pci_is_enabled(pdev)) { + pci_disable_pcie_error_reporting(pdev); + pci_disable_device(pdev); + } +} + +static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown) +{ + int i; + bool dead = true; + struct pci_dev *pdev = to_pci_dev(dev->dev); + + mutex_lock(&dev->shutdown_lock); + if (pci_is_enabled(pdev)) { + u32 csts = readl(dev->bar + NVME_REG_CSTS); + + if (dev->ctrl.state == NVME_CTRL_LIVE || + dev->ctrl.state == NVME_CTRL_RESETTING) + nvme_start_freeze(&dev->ctrl); + dead = !!((csts & NVME_CSTS_CFS) || !(csts & NVME_CSTS_RDY) || + pdev->error_state != pci_channel_io_normal); + } + + /* + * Give the controller a chance to complete all entered requests if + * doing a safe shutdown. + */ + if (!dead) { + if (shutdown) + nvme_wait_freeze_timeout(&dev->ctrl, NVME_IO_TIMEOUT); + } + + nvme_stop_queues(&dev->ctrl); + + if (!dead && dev->ctrl.queue_count > 0) { + nvme_disable_io_queues(dev); + nvme_disable_admin_queue(dev, shutdown); + } + for (i = dev->ctrl.queue_count - 1; i >= 0; i--) + nvme_suspend_queue(&dev->queues[i]); + + nvme_pci_disable(dev); + + blk_mq_tagset_busy_iter(&dev->tagset, nvme_cancel_request, &dev->ctrl); + blk_mq_tagset_busy_iter(&dev->admin_tagset, nvme_cancel_request, &dev->ctrl); + + /* + * The driver will not be starting up queues again if shutting down so + * must flush all entered requests to their failed completion to avoid + * deadlocking blk-mq hot-cpu notifier. + */ + if (shutdown) { + nvme_start_queues(&dev->ctrl); + if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) + blk_mq_unquiesce_queue(dev->ctrl.admin_q); + } + mutex_unlock(&dev->shutdown_lock); +} + +static int nvme_setup_prp_pools(struct nvme_dev *dev) +{ + dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, + PAGE_SIZE, PAGE_SIZE, 0); + if (!dev->prp_page_pool) + return -ENOMEM; + + /* Optimisation for I/Os between 4k and 128k */ + dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, + 256, 256, 0); + if (!dev->prp_small_pool) { + dma_pool_destroy(dev->prp_page_pool); + return -ENOMEM; + } + return 0; +} + +static void nvme_release_prp_pools(struct nvme_dev *dev) +{ + dma_pool_destroy(dev->prp_page_pool); + dma_pool_destroy(dev->prp_small_pool); +} + +static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl) +{ + struct nvme_dev *dev = to_nvme_dev(ctrl); + + nvme_dbbuf_dma_free(dev); + put_device(dev->dev); + if (dev->tagset.tags) + blk_mq_free_tag_set(&dev->tagset); + if (dev->ctrl.admin_q) + blk_put_queue(dev->ctrl.admin_q); + kfree(dev->queues); + free_opal_dev(dev->ctrl.opal_dev); + mempool_destroy(dev->iod_mempool); + kfree(dev); +} + +static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status) +{ + dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status); + + nvme_get_ctrl(&dev->ctrl); + nvme_dev_disable(dev, false); + nvme_kill_queues(&dev->ctrl); + if (!queue_work(nvme_wq, &dev->remove_work)) + nvme_put_ctrl(&dev->ctrl); +} + +static void nvme_reset_work(struct work_struct *work) +{ + struct nvme_dev *dev = + container_of(work, struct nvme_dev, ctrl.reset_work); + bool was_suspend = !!(dev->ctrl.ctrl_config & NVME_CC_SHN_NORMAL); + int result; + enum nvme_ctrl_state new_state = NVME_CTRL_LIVE; + + if (dev->ctrl.state != NVME_CTRL_RESETTING) { + dev_warn(dev->ctrl.device, "ctrl state %d is not RESETTING\n", + dev->ctrl.state); + result = -ENODEV; + goto out; + } + + /* + * If we're called to reset a live controller first shut it down before + * moving on. + */ + if (dev->ctrl.ctrl_config & NVME_CC_ENABLE) + nvme_dev_disable(dev, false); + + mutex_lock(&dev->shutdown_lock); + result = nvme_pci_enable(dev); + if (result) + goto out_unlock; + + result = nvme_pci_configure_admin_queue(dev); + if (result) + goto out_unlock; + + result = nvme_alloc_admin_tags(dev); + if (result) + goto out_unlock; + + /* + * Limit the max command size to prevent iod->sg allocations going + * over a single page. + */ + dev->ctrl.max_hw_sectors = NVME_MAX_KB_SZ << 1; + dev->ctrl.max_segments = NVME_MAX_SEGS; + mutex_unlock(&dev->shutdown_lock); + + /* + * Introduce CONNECTING state from nvme-fc/rdma transports to mark the + * initializing procedure here. + */ + if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_CONNECTING)) { + dev_warn(dev->ctrl.device, + "failed to mark controller CONNECTING\n"); + result = -EBUSY; + goto out; + } + + result = nvme_init_identify(&dev->ctrl); + if (result) + goto out; + + if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) { + if (!dev->ctrl.opal_dev) + dev->ctrl.opal_dev = + init_opal_dev(&dev->ctrl, &nvme_sec_submit); + else if (was_suspend) + opal_unlock_from_suspend(dev->ctrl.opal_dev); + } else { + free_opal_dev(dev->ctrl.opal_dev); + dev->ctrl.opal_dev = NULL; + } + + if (dev->ctrl.oacs & NVME_CTRL_OACS_DBBUF_SUPP) { + result = nvme_dbbuf_dma_alloc(dev); + if (result) + dev_warn(dev->dev, + "unable to allocate dma for dbbuf\n"); + } + + if (dev->ctrl.hmpre) { + result = nvme_setup_host_mem(dev); + if (result < 0) + goto out; + } + + result = nvme_setup_io_queues(dev); + if (result) + goto out; + + /* + * Keep the controller around but remove all namespaces if we don't have + * any working I/O queue. + */ + if (dev->online_queues < 2) { + dev_warn(dev->ctrl.device, "IO queues not created\n"); + nvme_kill_queues(&dev->ctrl); + nvme_remove_namespaces(&dev->ctrl); + new_state = NVME_CTRL_ADMIN_ONLY; + } else { + nvme_start_queues(&dev->ctrl); + nvme_wait_freeze(&dev->ctrl); + /* hit this only when allocate tagset fails */ + if (nvme_dev_add(dev)) + new_state = NVME_CTRL_ADMIN_ONLY; + nvme_unfreeze(&dev->ctrl); + } + + /* + * If only admin queue live, keep it to do further investigation or + * recovery. + */ + if (!nvme_change_ctrl_state(&dev->ctrl, new_state)) { + dev_warn(dev->ctrl.device, + "failed to mark controller state %d\n", new_state); + result = -ENODEV; + goto out; + } + + nvme_start_ctrl(&dev->ctrl); + return; + + out_unlock: + mutex_unlock(&dev->shutdown_lock); + out: + nvme_remove_dead_ctrl(dev, result); +} + +static void nvme_remove_dead_ctrl_work(struct work_struct *work) +{ + struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work); + struct pci_dev *pdev = to_pci_dev(dev->dev); + + if (pci_get_drvdata(pdev)) + device_release_driver(&pdev->dev); + nvme_put_ctrl(&dev->ctrl); +} + +static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) +{ + *val = readl(to_nvme_dev(ctrl)->bar + off); + return 0; +} + +static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) +{ + writel(val, to_nvme_dev(ctrl)->bar + off); + return 0; +} + +static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) +{ + *val = lo_hi_readq(to_nvme_dev(ctrl)->bar + off); + return 0; +} + +static int nvme_pci_get_address(struct nvme_ctrl *ctrl, char *buf, int size) +{ + struct pci_dev *pdev = to_pci_dev(to_nvme_dev(ctrl)->dev); + + return snprintf(buf, size, "%s", dev_name(&pdev->dev)); +} + +static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { + .name = "pcie", + .module = THIS_MODULE, + .flags = NVME_F_METADATA_SUPPORTED, + .reg_read32 = nvme_pci_reg_read32, + .reg_write32 = nvme_pci_reg_write32, + .reg_read64 = nvme_pci_reg_read64, + .free_ctrl = nvme_pci_free_ctrl, + .submit_async_event = nvme_pci_submit_async_event, + .get_address = nvme_pci_get_address, +}; + +static int nvme_dev_map(struct nvme_dev *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev->dev); + + if (pci_request_mem_regions(pdev, "nvme")) + return -ENODEV; + + if (nvme_remap_bar(dev, NVME_REG_DBS + 4096)) + goto release; + + return 0; + release: + pci_release_mem_regions(pdev); + return -ENODEV; +} + +static unsigned long check_vendor_combination_bug(struct pci_dev *pdev) +{ + if (pdev->vendor == 0x144d && pdev->device == 0xa802) { + /* + * Several Samsung devices seem to drop off the PCIe bus + * randomly when APST is on and uses the deepest sleep state. + * This has been observed on a Samsung "SM951 NVMe SAMSUNG + * 256GB", a "PM951 NVMe SAMSUNG 512GB", and a "Samsung SSD + * 950 PRO 256GB", but it seems to be restricted to two Dell + * laptops. + */ + if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.") && + (dmi_match(DMI_PRODUCT_NAME, "XPS 15 9550") || + dmi_match(DMI_PRODUCT_NAME, "Precision 5510"))) + return NVME_QUIRK_NO_DEEPEST_PS; + } else if (pdev->vendor == 0x144d && pdev->device == 0xa804) { + /* + * Samsung SSD 960 EVO drops off the PCIe bus after system + * suspend on a Ryzen board, ASUS PRIME B350M-A, as well as + * within few minutes after bootup on a Coffee Lake board - + * ASUS PRIME Z370-A + */ + if (dmi_match(DMI_BOARD_VENDOR, "ASUSTeK COMPUTER INC.") && + (dmi_match(DMI_BOARD_NAME, "PRIME B350M-A") || + dmi_match(DMI_BOARD_NAME, "PRIME Z370-A"))) + return NVME_QUIRK_NO_APST; + } + + return 0; +} + +static void nvme_async_probe(void *data, async_cookie_t cookie) +{ + struct nvme_dev *dev = data; + + flush_work(&dev->ctrl.reset_work); + flush_work(&dev->ctrl.scan_work); + nvme_put_ctrl(&dev->ctrl); +} + +static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + int node, result = -ENOMEM; + struct nvme_dev *dev; + unsigned long quirks = id->driver_data; + size_t alloc_size; + + node = dev_to_node(&pdev->dev); + if (node == NUMA_NO_NODE) + set_dev_node(&pdev->dev, first_memory_node); + + dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); + if (!dev) + return -ENOMEM; + + dev->queues = kcalloc_node(num_possible_cpus() + 1, + sizeof(struct nvme_queue), GFP_KERNEL, node); + if (!dev->queues) + goto free; + + dev->dev = get_device(&pdev->dev); + pci_set_drvdata(pdev, dev); + + result = nvme_dev_map(dev); + if (result) + goto put_pci; + + INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work); + INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work); + mutex_init(&dev->shutdown_lock); + init_completion(&dev->ioq_wait); + + result = nvme_setup_prp_pools(dev); + if (result) + goto unmap; + + quirks |= check_vendor_combination_bug(pdev); + + /* + * Double check that our mempool alloc size will cover the biggest + * command we support. + */ + alloc_size = nvme_pci_iod_alloc_size(dev, NVME_MAX_KB_SZ, + NVME_MAX_SEGS, true); + WARN_ON_ONCE(alloc_size > PAGE_SIZE); + + dev->iod_mempool = mempool_create_node(1, mempool_kmalloc, + mempool_kfree, + (void *) alloc_size, + GFP_KERNEL, node); + if (!dev->iod_mempool) { + result = -ENOMEM; + goto release_pools; + } + + result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops, + quirks); + if (result) + goto release_mempool; + + dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev)); + + nvme_reset_ctrl(&dev->ctrl); + nvme_get_ctrl(&dev->ctrl); + async_schedule(nvme_async_probe, dev); + + return 0; + + release_mempool: + mempool_destroy(dev->iod_mempool); + release_pools: + nvme_release_prp_pools(dev); + unmap: + nvme_dev_unmap(dev); + put_pci: + put_device(dev->dev); + free: + kfree(dev->queues); + kfree(dev); + return result; +} + +static void nvme_reset_prepare(struct pci_dev *pdev) +{ + struct nvme_dev *dev = pci_get_drvdata(pdev); + nvme_dev_disable(dev, false); +} + +static void nvme_reset_done(struct pci_dev *pdev) +{ + struct nvme_dev *dev = pci_get_drvdata(pdev); + nvme_reset_ctrl_sync(&dev->ctrl); +} + +static void nvme_shutdown(struct pci_dev *pdev) +{ + struct nvme_dev *dev = pci_get_drvdata(pdev); + nvme_dev_disable(dev, true); +} + +/* + * The driver's remove may be called on a device in a partially initialized + * state. This function must not have any dependencies on the device state in + * order to proceed. + */ +static void nvme_remove(struct pci_dev *pdev) +{ + struct nvme_dev *dev = pci_get_drvdata(pdev); + + nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING); + pci_set_drvdata(pdev, NULL); + + if (!pci_device_is_present(pdev)) { + nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD); + nvme_dev_disable(dev, true); + } + + flush_work(&dev->ctrl.reset_work); + nvme_stop_ctrl(&dev->ctrl); + nvme_remove_namespaces(&dev->ctrl); + nvme_dev_disable(dev, true); + nvme_release_cmb(dev); + nvme_free_host_mem(dev); + nvme_dev_remove_admin(dev); + nvme_free_queues(dev, 0); + nvme_uninit_ctrl(&dev->ctrl); + nvme_release_prp_pools(dev); + nvme_dev_unmap(dev); + nvme_put_ctrl(&dev->ctrl); +} + +#ifdef CONFIG_PM_SLEEP +static int nvme_suspend(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct nvme_dev *ndev = pci_get_drvdata(pdev); + + nvme_dev_disable(ndev, true); + return 0; +} + +static int nvme_resume(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct nvme_dev *ndev = pci_get_drvdata(pdev); + + nvme_reset_ctrl(&ndev->ctrl); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); + +static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + struct nvme_dev *dev = pci_get_drvdata(pdev); + + /* + * A frozen channel requires a reset. When detected, this method will + * shutdown the controller to quiesce. The controller will be restarted + * after the slot reset through driver's slot_reset callback. + */ + switch (state) { + case pci_channel_io_normal: + return PCI_ERS_RESULT_CAN_RECOVER; + case pci_channel_io_frozen: + dev_warn(dev->ctrl.device, + "frozen state error detected, reset controller\n"); + nvme_dev_disable(dev, false); + return PCI_ERS_RESULT_NEED_RESET; + case pci_channel_io_perm_failure: + dev_warn(dev->ctrl.device, + "failure state error detected, request disconnect\n"); + return PCI_ERS_RESULT_DISCONNECT; + } + return PCI_ERS_RESULT_NEED_RESET; +} + +static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev) +{ + struct nvme_dev *dev = pci_get_drvdata(pdev); + + dev_info(dev->ctrl.device, "restart after slot reset\n"); + pci_restore_state(pdev); + nvme_reset_ctrl(&dev->ctrl); + return PCI_ERS_RESULT_RECOVERED; +} + +static void nvme_error_resume(struct pci_dev *pdev) +{ + struct nvme_dev *dev = pci_get_drvdata(pdev); + + flush_work(&dev->ctrl.reset_work); + pci_cleanup_aer_uncorrect_error_status(pdev); +} + +static const struct pci_error_handlers nvme_err_handler = { + .error_detected = nvme_error_detected, + .slot_reset = nvme_slot_reset, + .resume = nvme_error_resume, + .reset_prepare = nvme_reset_prepare, + .reset_done = nvme_reset_done, +}; + +static const struct pci_device_id nvme_id_table[] = { + { PCI_VDEVICE(INTEL, 0x0953), + .driver_data = NVME_QUIRK_STRIPE_SIZE | + NVME_QUIRK_DEALLOCATE_ZEROES, }, + { PCI_VDEVICE(INTEL, 0x0a53), + .driver_data = NVME_QUIRK_STRIPE_SIZE | + NVME_QUIRK_DEALLOCATE_ZEROES, }, + { PCI_VDEVICE(INTEL, 0x0a54), + .driver_data = NVME_QUIRK_STRIPE_SIZE | + NVME_QUIRK_DEALLOCATE_ZEROES, }, + { PCI_VDEVICE(INTEL, 0x0a55), + .driver_data = NVME_QUIRK_STRIPE_SIZE | + NVME_QUIRK_DEALLOCATE_ZEROES, }, + { PCI_VDEVICE(INTEL, 0xf1a5), /* Intel 600P/P3100 */ + .driver_data = NVME_QUIRK_NO_DEEPEST_PS | + NVME_QUIRK_MEDIUM_PRIO_SQ }, + { PCI_VDEVICE(INTEL, 0x5845), /* Qemu emulated controller */ + .driver_data = NVME_QUIRK_IDENTIFY_CNS, }, + { PCI_DEVICE(0x1bb1, 0x0100), /* Seagate Nytro Flash Storage */ + .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, + { PCI_DEVICE(0x1c58, 0x0003), /* HGST adapter */ + .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, + { PCI_DEVICE(0x1c58, 0x0023), /* WDC SN200 adapter */ + .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, + { PCI_DEVICE(0x1c5f, 0x0540), /* Memblaze Pblaze4 adapter */ + .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, + { PCI_DEVICE(0x144d, 0xa821), /* Samsung PM1725 */ + .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, + { PCI_DEVICE(0x144d, 0xa822), /* Samsung PM1725a */ + .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, + { PCI_DEVICE(0x1d1d, 0x1f1f), /* LighNVM qemu device */ + .driver_data = NVME_QUIRK_LIGHTNVM, }, + { PCI_DEVICE(0x1d1d, 0x2807), /* CNEX WL */ + .driver_data = NVME_QUIRK_LIGHTNVM, }, + { PCI_DEVICE(0x1d1d, 0x2601), /* CNEX Granby */ + .driver_data = NVME_QUIRK_LIGHTNVM, }, + { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, + { PCI_DEVICE(0x2646, 0x2263), /* KINGSTON A2000 NVMe SSD */ + .driver_data = NVME_QUIRK_NO_DEEPEST_PS, }, + { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) }, + { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) }, + { 0, } +}; +MODULE_DEVICE_TABLE(pci, nvme_id_table); + +static struct pci_driver nvme_driver = { + .name = "nvme", + .id_table = nvme_id_table, + .probe = nvme_probe, + .remove = nvme_remove, + .shutdown = nvme_shutdown, + .driver = { + .pm = &nvme_dev_pm_ops, + }, + .sriov_configure = pci_sriov_configure_simple, + .err_handler = &nvme_err_handler, +}; + +static int __init nvme_init(void) +{ + return pci_register_driver(&nvme_driver); +} + +static void __exit nvme_exit(void) +{ + pci_unregister_driver(&nvme_driver); + flush_workqueue(nvme_wq); + _nvme_check_size(); +} + +MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("1.0"); +module_init(nvme_init); +module_exit(nvme_exit); diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c new file mode 100644 index 000000000..55f499952 --- /dev/null +++ b/drivers/nvme/host/rdma.c @@ -0,0 +1,2121 @@ +/* + * NVMe over Fabrics RDMA host code. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <rdma/mr_pool.h> +#include <linux/err.h> +#include <linux/string.h> +#include <linux/atomic.h> +#include <linux/blk-mq.h> +#include <linux/blk-mq-rdma.h> +#include <linux/types.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/scatterlist.h> +#include <linux/nvme.h> +#include <asm/unaligned.h> + +#include <rdma/ib_verbs.h> +#include <rdma/rdma_cm.h> +#include <linux/nvme-rdma.h> + +#include "nvme.h" +#include "fabrics.h" + + +#define NVME_RDMA_CONNECT_TIMEOUT_MS 3000 /* 3 second */ + +#define NVME_RDMA_MAX_SEGMENTS 256 + +#define NVME_RDMA_MAX_INLINE_SEGMENTS 4 + +struct nvme_rdma_device { + struct ib_device *dev; + struct ib_pd *pd; + struct kref ref; + struct list_head entry; + unsigned int num_inline_segments; +}; + +struct nvme_rdma_qe { + struct ib_cqe cqe; + void *data; + u64 dma; +}; + +struct nvme_rdma_queue; +struct nvme_rdma_request { + struct nvme_request req; + struct ib_mr *mr; + struct nvme_rdma_qe sqe; + union nvme_result result; + __le16 status; + refcount_t ref; + struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS]; + u32 num_sge; + int nents; + struct ib_reg_wr reg_wr; + struct ib_cqe reg_cqe; + struct nvme_rdma_queue *queue; + struct sg_table sg_table; + struct scatterlist first_sgl[]; +}; + +enum nvme_rdma_queue_flags { + NVME_RDMA_Q_ALLOCATED = 0, + NVME_RDMA_Q_LIVE = 1, + NVME_RDMA_Q_TR_READY = 2, +}; + +struct nvme_rdma_queue { + struct nvme_rdma_qe *rsp_ring; + int queue_size; + size_t cmnd_capsule_len; + struct nvme_rdma_ctrl *ctrl; + struct nvme_rdma_device *device; + struct ib_cq *ib_cq; + struct ib_qp *qp; + + unsigned long flags; + struct rdma_cm_id *cm_id; + int cm_error; + struct completion cm_done; +}; + +struct nvme_rdma_ctrl { + /* read only in the hot path */ + struct nvme_rdma_queue *queues; + + /* other member variables */ + struct blk_mq_tag_set tag_set; + struct work_struct err_work; + + struct nvme_rdma_qe async_event_sqe; + + struct delayed_work reconnect_work; + + struct list_head list; + + struct blk_mq_tag_set admin_tag_set; + struct nvme_rdma_device *device; + + u32 max_fr_pages; + + struct sockaddr_storage addr; + struct sockaddr_storage src_addr; + + struct nvme_ctrl ctrl; + struct mutex teardown_lock; + bool use_inline_data; +}; + +static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl) +{ + return container_of(ctrl, struct nvme_rdma_ctrl, ctrl); +} + +static LIST_HEAD(device_list); +static DEFINE_MUTEX(device_list_mutex); + +static LIST_HEAD(nvme_rdma_ctrl_list); +static DEFINE_MUTEX(nvme_rdma_ctrl_mutex); + +/* + * Disabling this option makes small I/O goes faster, but is fundamentally + * unsafe. With it turned off we will have to register a global rkey that + * allows read and write access to all physical memory. + */ +static bool register_always = true; +module_param(register_always, bool, 0444); +MODULE_PARM_DESC(register_always, + "Use memory registration even for contiguous memory regions"); + +static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event); +static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc); + +static const struct blk_mq_ops nvme_rdma_mq_ops; +static const struct blk_mq_ops nvme_rdma_admin_mq_ops; + +/* XXX: really should move to a generic header sooner or later.. */ +static inline void put_unaligned_le24(u32 val, u8 *p) +{ + *p++ = val; + *p++ = val >> 8; + *p++ = val >> 16; +} + +static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue) +{ + return queue - queue->ctrl->queues; +} + +static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue) +{ + return queue->cmnd_capsule_len - sizeof(struct nvme_command); +} + +static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe, + size_t capsule_size, enum dma_data_direction dir) +{ + ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir); + kfree(qe->data); +} + +static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe, + size_t capsule_size, enum dma_data_direction dir) +{ + qe->data = kzalloc(capsule_size, GFP_KERNEL); + if (!qe->data) + return -ENOMEM; + + qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir); + if (ib_dma_mapping_error(ibdev, qe->dma)) { + kfree(qe->data); + qe->data = NULL; + return -ENOMEM; + } + + return 0; +} + +static void nvme_rdma_free_ring(struct ib_device *ibdev, + struct nvme_rdma_qe *ring, size_t ib_queue_size, + size_t capsule_size, enum dma_data_direction dir) +{ + int i; + + for (i = 0; i < ib_queue_size; i++) + nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir); + kfree(ring); +} + +static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev, + size_t ib_queue_size, size_t capsule_size, + enum dma_data_direction dir) +{ + struct nvme_rdma_qe *ring; + int i; + + ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL); + if (!ring) + return NULL; + + for (i = 0; i < ib_queue_size; i++) { + if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir)) + goto out_free_ring; + } + + return ring; + +out_free_ring: + nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir); + return NULL; +} + +static void nvme_rdma_qp_event(struct ib_event *event, void *context) +{ + pr_debug("QP event %s (%d)\n", + ib_event_msg(event->event), event->event); + +} + +static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue) +{ + wait_for_completion_interruptible_timeout(&queue->cm_done, + msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1); + return queue->cm_error; +} + +static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor) +{ + struct nvme_rdma_device *dev = queue->device; + struct ib_qp_init_attr init_attr; + int ret; + + memset(&init_attr, 0, sizeof(init_attr)); + init_attr.event_handler = nvme_rdma_qp_event; + /* +1 for drain */ + init_attr.cap.max_send_wr = factor * queue->queue_size + 1; + /* +1 for drain */ + init_attr.cap.max_recv_wr = queue->queue_size + 1; + init_attr.cap.max_recv_sge = 1; + init_attr.cap.max_send_sge = 1 + dev->num_inline_segments; + init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; + init_attr.qp_type = IB_QPT_RC; + init_attr.send_cq = queue->ib_cq; + init_attr.recv_cq = queue->ib_cq; + + ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr); + + queue->qp = queue->cm_id->qp; + return ret; +} + +static void nvme_rdma_exit_request(struct blk_mq_tag_set *set, + struct request *rq, unsigned int hctx_idx) +{ + struct nvme_rdma_ctrl *ctrl = set->driver_data; + struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); + int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0; + struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx]; + struct nvme_rdma_device *dev = queue->device; + + nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command), + DMA_TO_DEVICE); +} + +static int nvme_rdma_init_request(struct blk_mq_tag_set *set, + struct request *rq, unsigned int hctx_idx, + unsigned int numa_node) +{ + struct nvme_rdma_ctrl *ctrl = set->driver_data; + struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); + int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0; + struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx]; + struct nvme_rdma_device *dev = queue->device; + struct ib_device *ibdev = dev->dev; + int ret; + + nvme_req(rq)->ctrl = &ctrl->ctrl; + ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command), + DMA_TO_DEVICE); + if (ret) + return ret; + + req->queue = queue; + + return 0; +} + +static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_rdma_ctrl *ctrl = data; + struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1]; + + BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); + + hctx->driver_data = queue; + return 0; +} + +static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_rdma_ctrl *ctrl = data; + struct nvme_rdma_queue *queue = &ctrl->queues[0]; + + BUG_ON(hctx_idx != 0); + + hctx->driver_data = queue; + return 0; +} + +static void nvme_rdma_free_dev(struct kref *ref) +{ + struct nvme_rdma_device *ndev = + container_of(ref, struct nvme_rdma_device, ref); + + mutex_lock(&device_list_mutex); + list_del(&ndev->entry); + mutex_unlock(&device_list_mutex); + + ib_dealloc_pd(ndev->pd); + kfree(ndev); +} + +static void nvme_rdma_dev_put(struct nvme_rdma_device *dev) +{ + kref_put(&dev->ref, nvme_rdma_free_dev); +} + +static int nvme_rdma_dev_get(struct nvme_rdma_device *dev) +{ + return kref_get_unless_zero(&dev->ref); +} + +static struct nvme_rdma_device * +nvme_rdma_find_get_device(struct rdma_cm_id *cm_id) +{ + struct nvme_rdma_device *ndev; + + mutex_lock(&device_list_mutex); + list_for_each_entry(ndev, &device_list, entry) { + if (ndev->dev->node_guid == cm_id->device->node_guid && + nvme_rdma_dev_get(ndev)) + goto out_unlock; + } + + ndev = kzalloc(sizeof(*ndev), GFP_KERNEL); + if (!ndev) + goto out_err; + + ndev->dev = cm_id->device; + kref_init(&ndev->ref); + + ndev->pd = ib_alloc_pd(ndev->dev, + register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY); + if (IS_ERR(ndev->pd)) + goto out_free_dev; + + if (!(ndev->dev->attrs.device_cap_flags & + IB_DEVICE_MEM_MGT_EXTENSIONS)) { + dev_err(&ndev->dev->dev, + "Memory registrations not supported.\n"); + goto out_free_pd; + } + + ndev->num_inline_segments = min(NVME_RDMA_MAX_INLINE_SEGMENTS, + ndev->dev->attrs.max_send_sge - 1); + list_add(&ndev->entry, &device_list); +out_unlock: + mutex_unlock(&device_list_mutex); + return ndev; + +out_free_pd: + ib_dealloc_pd(ndev->pd); +out_free_dev: + kfree(ndev); +out_err: + mutex_unlock(&device_list_mutex); + return NULL; +} + +static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue) +{ + struct nvme_rdma_device *dev; + struct ib_device *ibdev; + + if (!test_and_clear_bit(NVME_RDMA_Q_TR_READY, &queue->flags)) + return; + + dev = queue->device; + ibdev = dev->dev; + + ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs); + + /* + * The cm_id object might have been destroyed during RDMA connection + * establishment error flow to avoid getting other cma events, thus + * the destruction of the QP shouldn't use rdma_cm API. + */ + ib_destroy_qp(queue->qp); + ib_free_cq(queue->ib_cq); + + nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size, + sizeof(struct nvme_completion), DMA_FROM_DEVICE); + + nvme_rdma_dev_put(dev); +} + +static int nvme_rdma_get_max_fr_pages(struct ib_device *ibdev) +{ + return min_t(u32, NVME_RDMA_MAX_SEGMENTS, + ibdev->attrs.max_fast_reg_page_list_len); +} + +static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue) +{ + struct ib_device *ibdev; + const int send_wr_factor = 3; /* MR, SEND, INV */ + const int cq_factor = send_wr_factor + 1; /* + RECV */ + int comp_vector, idx = nvme_rdma_queue_idx(queue); + int ret; + + queue->device = nvme_rdma_find_get_device(queue->cm_id); + if (!queue->device) { + dev_err(queue->cm_id->device->dev.parent, + "no client data found!\n"); + return -ECONNREFUSED; + } + ibdev = queue->device->dev; + + /* + * Spread I/O queues completion vectors according their queue index. + * Admin queues can always go on completion vector 0. + */ + comp_vector = (idx == 0 ? idx : idx - 1) % ibdev->num_comp_vectors; + + /* +1 for ib_stop_cq */ + queue->ib_cq = ib_alloc_cq(ibdev, queue, + cq_factor * queue->queue_size + 1, + comp_vector, IB_POLL_SOFTIRQ); + if (IS_ERR(queue->ib_cq)) { + ret = PTR_ERR(queue->ib_cq); + goto out_put_dev; + } + + ret = nvme_rdma_create_qp(queue, send_wr_factor); + if (ret) + goto out_destroy_ib_cq; + + queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size, + sizeof(struct nvme_completion), DMA_FROM_DEVICE); + if (!queue->rsp_ring) { + ret = -ENOMEM; + goto out_destroy_qp; + } + + ret = ib_mr_pool_init(queue->qp, &queue->qp->rdma_mrs, + queue->queue_size, + IB_MR_TYPE_MEM_REG, + nvme_rdma_get_max_fr_pages(ibdev)); + if (ret) { + dev_err(queue->ctrl->ctrl.device, + "failed to initialize MR pool sized %d for QID %d\n", + queue->queue_size, idx); + goto out_destroy_ring; + } + + set_bit(NVME_RDMA_Q_TR_READY, &queue->flags); + + return 0; + +out_destroy_ring: + nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size, + sizeof(struct nvme_completion), DMA_FROM_DEVICE); +out_destroy_qp: + rdma_destroy_qp(queue->cm_id); +out_destroy_ib_cq: + ib_free_cq(queue->ib_cq); +out_put_dev: + nvme_rdma_dev_put(queue->device); + return ret; +} + +static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl, + int idx, size_t queue_size) +{ + struct nvme_rdma_queue *queue; + struct sockaddr *src_addr = NULL; + int ret; + + queue = &ctrl->queues[idx]; + queue->ctrl = ctrl; + init_completion(&queue->cm_done); + + if (idx > 0) + queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16; + else + queue->cmnd_capsule_len = sizeof(struct nvme_command); + + queue->queue_size = queue_size; + + queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue, + RDMA_PS_TCP, IB_QPT_RC); + if (IS_ERR(queue->cm_id)) { + dev_info(ctrl->ctrl.device, + "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id)); + return PTR_ERR(queue->cm_id); + } + + if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR) + src_addr = (struct sockaddr *)&ctrl->src_addr; + + queue->cm_error = -ETIMEDOUT; + ret = rdma_resolve_addr(queue->cm_id, src_addr, + (struct sockaddr *)&ctrl->addr, + NVME_RDMA_CONNECT_TIMEOUT_MS); + if (ret) { + dev_info(ctrl->ctrl.device, + "rdma_resolve_addr failed (%d).\n", ret); + goto out_destroy_cm_id; + } + + ret = nvme_rdma_wait_for_cm(queue); + if (ret) { + dev_info(ctrl->ctrl.device, + "rdma connection establishment failed (%d)\n", ret); + goto out_destroy_cm_id; + } + + set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags); + + return 0; + +out_destroy_cm_id: + rdma_destroy_id(queue->cm_id); + nvme_rdma_destroy_queue_ib(queue); + return ret; +} + +static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue) +{ + if (!test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags)) + return; + + rdma_disconnect(queue->cm_id); + ib_drain_qp(queue->qp); +} + +static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue) +{ + if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags)) + return; + + nvme_rdma_destroy_queue_ib(queue); + rdma_destroy_id(queue->cm_id); +} + +static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl) +{ + int i; + + for (i = 1; i < ctrl->ctrl.queue_count; i++) + nvme_rdma_free_queue(&ctrl->queues[i]); +} + +static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl) +{ + int i; + + for (i = 1; i < ctrl->ctrl.queue_count; i++) + nvme_rdma_stop_queue(&ctrl->queues[i]); +} + +static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx) +{ + int ret; + + if (idx) + ret = nvmf_connect_io_queue(&ctrl->ctrl, idx); + else + ret = nvmf_connect_admin_queue(&ctrl->ctrl); + + if (!ret) + set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[idx].flags); + else + dev_info(ctrl->ctrl.device, + "failed to connect queue: %d ret=%d\n", idx, ret); + return ret; +} + +static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl) +{ + int i, ret = 0; + + for (i = 1; i < ctrl->ctrl.queue_count; i++) { + ret = nvme_rdma_start_queue(ctrl, i); + if (ret) + goto out_stop_queues; + } + + return 0; + +out_stop_queues: + for (i--; i >= 1; i--) + nvme_rdma_stop_queue(&ctrl->queues[i]); + return ret; +} + +static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl) +{ + struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; + struct ib_device *ibdev = ctrl->device->dev; + unsigned int nr_io_queues; + int i, ret; + + nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); + + /* + * we map queues according to the device irq vectors for + * optimal locality so we don't need more queues than + * completion vectors. + */ + nr_io_queues = min_t(unsigned int, nr_io_queues, + ibdev->num_comp_vectors); + + ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); + if (ret) + return ret; + + if (nr_io_queues == 0) { + dev_err(ctrl->ctrl.device, + "unable to set any I/O queues\n"); + return -ENOMEM; + } + + ctrl->ctrl.queue_count = nr_io_queues + 1; + dev_info(ctrl->ctrl.device, + "creating %d I/O queues.\n", nr_io_queues); + + for (i = 1; i < ctrl->ctrl.queue_count; i++) { + ret = nvme_rdma_alloc_queue(ctrl, i, + ctrl->ctrl.sqsize + 1); + if (ret) + goto out_free_queues; + } + + return 0; + +out_free_queues: + for (i--; i >= 1; i--) + nvme_rdma_free_queue(&ctrl->queues[i]); + + return ret; +} + +static void nvme_rdma_free_tagset(struct nvme_ctrl *nctrl, + struct blk_mq_tag_set *set) +{ + struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); + + blk_mq_free_tag_set(set); + nvme_rdma_dev_put(ctrl->device); +} + +static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl, + bool admin) +{ + struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); + struct blk_mq_tag_set *set; + int ret; + + if (admin) { + set = &ctrl->admin_tag_set; + memset(set, 0, sizeof(*set)); + set->ops = &nvme_rdma_admin_mq_ops; + set->queue_depth = NVME_AQ_MQ_TAG_DEPTH; + set->reserved_tags = 2; /* connect + keep-alive */ + set->numa_node = NUMA_NO_NODE; + set->cmd_size = sizeof(struct nvme_rdma_request) + + SG_CHUNK_SIZE * sizeof(struct scatterlist); + set->driver_data = ctrl; + set->nr_hw_queues = 1; + set->timeout = ADMIN_TIMEOUT; + set->flags = BLK_MQ_F_NO_SCHED; + } else { + set = &ctrl->tag_set; + memset(set, 0, sizeof(*set)); + set->ops = &nvme_rdma_mq_ops; + set->queue_depth = nctrl->sqsize + 1; + set->reserved_tags = 1; /* fabric connect */ + set->numa_node = NUMA_NO_NODE; + set->flags = BLK_MQ_F_SHOULD_MERGE; + set->cmd_size = sizeof(struct nvme_rdma_request) + + SG_CHUNK_SIZE * sizeof(struct scatterlist); + set->driver_data = ctrl; + set->nr_hw_queues = nctrl->queue_count - 1; + set->timeout = NVME_IO_TIMEOUT; + } + + ret = blk_mq_alloc_tag_set(set); + if (ret) + goto out; + + /* + * We need a reference on the device as long as the tag_set is alive, + * as the MRs in the request structures need a valid ib_device. + */ + ret = nvme_rdma_dev_get(ctrl->device); + if (!ret) { + ret = -EINVAL; + goto out_free_tagset; + } + + return set; + +out_free_tagset: + blk_mq_free_tag_set(set); +out: + return ERR_PTR(ret); +} + +static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl, + bool remove) +{ + if (remove) { + blk_cleanup_queue(ctrl->ctrl.admin_q); + nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset); + } + if (ctrl->async_event_sqe.data) { + cancel_work_sync(&ctrl->ctrl.async_event_work); + nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe, + sizeof(struct nvme_command), DMA_TO_DEVICE); + ctrl->async_event_sqe.data = NULL; + } + nvme_rdma_free_queue(&ctrl->queues[0]); +} + +static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl, + bool new) +{ + int error; + + error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH); + if (error) + return error; + + ctrl->device = ctrl->queues[0].device; + + ctrl->max_fr_pages = nvme_rdma_get_max_fr_pages(ctrl->device->dev); + + error = nvme_rdma_alloc_qe(ctrl->device->dev, &ctrl->async_event_sqe, + sizeof(struct nvme_command), DMA_TO_DEVICE); + if (error) + goto out_free_queue; + + if (new) { + ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true); + if (IS_ERR(ctrl->ctrl.admin_tagset)) { + error = PTR_ERR(ctrl->ctrl.admin_tagset); + goto out_free_async_qe; + } + + ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); + if (IS_ERR(ctrl->ctrl.admin_q)) { + error = PTR_ERR(ctrl->ctrl.admin_q); + goto out_free_tagset; + } + } + + error = nvme_rdma_start_queue(ctrl, 0); + if (error) + goto out_cleanup_queue; + + error = ctrl->ctrl.ops->reg_read64(&ctrl->ctrl, NVME_REG_CAP, + &ctrl->ctrl.cap); + if (error) { + dev_err(ctrl->ctrl.device, + "prop_get NVME_REG_CAP failed\n"); + goto out_stop_queue; + } + + ctrl->ctrl.sqsize = + min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); + + error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); + if (error) + goto out_stop_queue; + + ctrl->ctrl.max_hw_sectors = + (ctrl->max_fr_pages - 1) << (ilog2(SZ_4K) - 9); + + error = nvme_init_identify(&ctrl->ctrl); + if (error) + goto out_stop_queue; + + return 0; + +out_stop_queue: + nvme_rdma_stop_queue(&ctrl->queues[0]); +out_cleanup_queue: + if (new) + blk_cleanup_queue(ctrl->ctrl.admin_q); +out_free_tagset: + if (new) + nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset); +out_free_async_qe: + if (ctrl->async_event_sqe.data) { + nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe, + sizeof(struct nvme_command), DMA_TO_DEVICE); + ctrl->async_event_sqe.data = NULL; + } +out_free_queue: + nvme_rdma_free_queue(&ctrl->queues[0]); + return error; +} + +static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl, + bool remove) +{ + if (remove) { + blk_cleanup_queue(ctrl->ctrl.connect_q); + nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset); + } + nvme_rdma_free_io_queues(ctrl); +} + +static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new) +{ + int ret; + + ret = nvme_rdma_alloc_io_queues(ctrl); + if (ret) + return ret; + + if (new) { + ctrl->ctrl.tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, false); + if (IS_ERR(ctrl->ctrl.tagset)) { + ret = PTR_ERR(ctrl->ctrl.tagset); + goto out_free_io_queues; + } + + ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); + if (IS_ERR(ctrl->ctrl.connect_q)) { + ret = PTR_ERR(ctrl->ctrl.connect_q); + goto out_free_tag_set; + } + } else { + blk_mq_update_nr_hw_queues(&ctrl->tag_set, + ctrl->ctrl.queue_count - 1); + } + + ret = nvme_rdma_start_io_queues(ctrl); + if (ret) + goto out_cleanup_connect_q; + + return 0; + +out_cleanup_connect_q: + if (new) + blk_cleanup_queue(ctrl->ctrl.connect_q); +out_free_tag_set: + if (new) + nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset); +out_free_io_queues: + nvme_rdma_free_io_queues(ctrl); + return ret; +} + +static void nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl *ctrl, + bool remove) +{ + mutex_lock(&ctrl->teardown_lock); + blk_mq_quiesce_queue(ctrl->ctrl.admin_q); + nvme_rdma_stop_queue(&ctrl->queues[0]); + if (ctrl->ctrl.admin_tagset) + blk_mq_tagset_busy_iter(ctrl->ctrl.admin_tagset, + nvme_cancel_request, &ctrl->ctrl); + blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); + nvme_rdma_destroy_admin_queue(ctrl, remove); + mutex_unlock(&ctrl->teardown_lock); +} + +static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl, + bool remove) +{ + mutex_lock(&ctrl->teardown_lock); + if (ctrl->ctrl.queue_count > 1) { + nvme_stop_queues(&ctrl->ctrl); + nvme_rdma_stop_io_queues(ctrl); + if (ctrl->ctrl.tagset) + blk_mq_tagset_busy_iter(ctrl->ctrl.tagset, + nvme_cancel_request, &ctrl->ctrl); + if (remove) + nvme_start_queues(&ctrl->ctrl); + nvme_rdma_destroy_io_queues(ctrl, remove); + } + mutex_unlock(&ctrl->teardown_lock); +} + +static void nvme_rdma_stop_ctrl(struct nvme_ctrl *nctrl) +{ + struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); + + cancel_work_sync(&ctrl->err_work); + cancel_delayed_work_sync(&ctrl->reconnect_work); +} + +static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl) +{ + struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); + + if (list_empty(&ctrl->list)) + goto free_ctrl; + + mutex_lock(&nvme_rdma_ctrl_mutex); + list_del(&ctrl->list); + mutex_unlock(&nvme_rdma_ctrl_mutex); + + nvmf_free_options(nctrl->opts); +free_ctrl: + kfree(ctrl->queues); + kfree(ctrl); +} + +static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl) +{ + /* If we are resetting/deleting then do nothing */ + if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) { + WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW || + ctrl->ctrl.state == NVME_CTRL_LIVE); + return; + } + + if (nvmf_should_reconnect(&ctrl->ctrl)) { + dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n", + ctrl->ctrl.opts->reconnect_delay); + queue_delayed_work(nvme_wq, &ctrl->reconnect_work, + ctrl->ctrl.opts->reconnect_delay * HZ); + } else { + nvme_delete_ctrl(&ctrl->ctrl); + } +} + +static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new) +{ + int ret = -EINVAL; + bool changed; + + ret = nvme_rdma_configure_admin_queue(ctrl, new); + if (ret) + return ret; + + if (ctrl->ctrl.icdoff) { + ret = -EOPNOTSUPP; + dev_err(ctrl->ctrl.device, "icdoff is not supported!\n"); + goto destroy_admin; + } + + if (!(ctrl->ctrl.sgls & (1 << 2))) { + ret = -EOPNOTSUPP; + dev_err(ctrl->ctrl.device, + "Mandatory keyed sgls are not supported!\n"); + goto destroy_admin; + } + + if (ctrl->ctrl.opts->queue_size > ctrl->ctrl.sqsize + 1) { + dev_warn(ctrl->ctrl.device, + "queue_size %zu > ctrl sqsize %u, clamping down\n", + ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1); + } + + if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) { + dev_warn(ctrl->ctrl.device, + "sqsize %u > ctrl maxcmd %u, clamping down\n", + ctrl->ctrl.sqsize + 1, ctrl->ctrl.maxcmd); + ctrl->ctrl.sqsize = ctrl->ctrl.maxcmd - 1; + } + + if (ctrl->ctrl.sgls & (1 << 20)) + ctrl->use_inline_data = true; + + if (ctrl->ctrl.queue_count > 1) { + ret = nvme_rdma_configure_io_queues(ctrl, new); + if (ret) + goto destroy_admin; + } + + changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); + if (!changed) { + /* state change failure is ok if we're in DELETING state */ + WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING); + ret = -EINVAL; + goto destroy_io; + } + + nvme_start_ctrl(&ctrl->ctrl); + return 0; + +destroy_io: + if (ctrl->ctrl.queue_count > 1) + nvme_rdma_destroy_io_queues(ctrl, new); +destroy_admin: + nvme_rdma_stop_queue(&ctrl->queues[0]); + nvme_rdma_destroy_admin_queue(ctrl, new); + return ret; +} + +static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work) +{ + struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work), + struct nvme_rdma_ctrl, reconnect_work); + + ++ctrl->ctrl.nr_reconnects; + + if (nvme_rdma_setup_ctrl(ctrl, false)) + goto requeue; + + dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n", + ctrl->ctrl.nr_reconnects); + + ctrl->ctrl.nr_reconnects = 0; + + return; + +requeue: + dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n", + ctrl->ctrl.nr_reconnects); + nvme_rdma_reconnect_or_remove(ctrl); +} + +static void nvme_rdma_error_recovery_work(struct work_struct *work) +{ + struct nvme_rdma_ctrl *ctrl = container_of(work, + struct nvme_rdma_ctrl, err_work); + + nvme_stop_keep_alive(&ctrl->ctrl); + flush_work(&ctrl->ctrl.async_event_work); + nvme_rdma_teardown_io_queues(ctrl, false); + nvme_start_queues(&ctrl->ctrl); + nvme_rdma_teardown_admin_queue(ctrl, false); + + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { + /* state change failure is ok if we're in DELETING state */ + WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING); + return; + } + + nvme_rdma_reconnect_or_remove(ctrl); +} + +static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl) +{ + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING)) + return; + + queue_work(nvme_wq, &ctrl->err_work); +} + +static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc, + const char *op) +{ + struct nvme_rdma_queue *queue = cq->cq_context; + struct nvme_rdma_ctrl *ctrl = queue->ctrl; + + if (ctrl->ctrl.state == NVME_CTRL_LIVE) + dev_info(ctrl->ctrl.device, + "%s for CQE 0x%p failed with status %s (%d)\n", + op, wc->wr_cqe, + ib_wc_status_msg(wc->status), wc->status); + nvme_rdma_error_recovery(ctrl); +} + +static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc) +{ + if (unlikely(wc->status != IB_WC_SUCCESS)) + nvme_rdma_wr_error(cq, wc, "MEMREG"); +} + +static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct nvme_rdma_request *req = + container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe); + struct request *rq = blk_mq_rq_from_pdu(req); + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + nvme_rdma_wr_error(cq, wc, "LOCAL_INV"); + return; + } + + if (refcount_dec_and_test(&req->ref)) + nvme_end_request(rq, req->status, req->result); + +} + +static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue, + struct nvme_rdma_request *req) +{ + struct ib_send_wr wr = { + .opcode = IB_WR_LOCAL_INV, + .next = NULL, + .num_sge = 0, + .send_flags = IB_SEND_SIGNALED, + .ex.invalidate_rkey = req->mr->rkey, + }; + + req->reg_cqe.done = nvme_rdma_inv_rkey_done; + wr.wr_cqe = &req->reg_cqe; + + return ib_post_send(queue->qp, &wr, NULL); +} + +static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue, + struct request *rq) +{ + struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); + struct nvme_rdma_device *dev = queue->device; + struct ib_device *ibdev = dev->dev; + + if (!blk_rq_payload_bytes(rq)) + return; + + if (req->mr) { + ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr); + req->mr = NULL; + } + + ib_dma_unmap_sg(ibdev, req->sg_table.sgl, + req->nents, rq_data_dir(rq) == + WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); + + nvme_cleanup_cmd(rq); + sg_free_table_chained(&req->sg_table, true); +} + +static int nvme_rdma_set_sg_null(struct nvme_command *c) +{ + struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; + + sg->addr = 0; + put_unaligned_le24(0, sg->length); + put_unaligned_le32(0, sg->key); + sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4; + return 0; +} + +static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue, + struct nvme_rdma_request *req, struct nvme_command *c, + int count) +{ + struct nvme_sgl_desc *sg = &c->common.dptr.sgl; + struct scatterlist *sgl = req->sg_table.sgl; + struct ib_sge *sge = &req->sge[1]; + u32 len = 0; + int i; + + for (i = 0; i < count; i++, sgl++, sge++) { + sge->addr = sg_dma_address(sgl); + sge->length = sg_dma_len(sgl); + sge->lkey = queue->device->pd->local_dma_lkey; + len += sge->length; + } + + sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff); + sg->length = cpu_to_le32(len); + sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET; + + req->num_sge += count; + return 0; +} + +static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue, + struct nvme_rdma_request *req, struct nvme_command *c) +{ + struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; + + sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl)); + put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length); + put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key); + sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4; + return 0; +} + +static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue, + struct nvme_rdma_request *req, struct nvme_command *c, + int count) +{ + struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; + int nr; + + req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs); + if (WARN_ON_ONCE(!req->mr)) + return -EAGAIN; + + /* + * Align the MR to a 4K page size to match the ctrl page size and + * the block virtual boundary. + */ + nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, SZ_4K); + if (unlikely(nr < count)) { + ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr); + req->mr = NULL; + if (nr < 0) + return nr; + return -EINVAL; + } + + ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey)); + + req->reg_cqe.done = nvme_rdma_memreg_done; + memset(&req->reg_wr, 0, sizeof(req->reg_wr)); + req->reg_wr.wr.opcode = IB_WR_REG_MR; + req->reg_wr.wr.wr_cqe = &req->reg_cqe; + req->reg_wr.wr.num_sge = 0; + req->reg_wr.mr = req->mr; + req->reg_wr.key = req->mr->rkey; + req->reg_wr.access = IB_ACCESS_LOCAL_WRITE | + IB_ACCESS_REMOTE_READ | + IB_ACCESS_REMOTE_WRITE; + + sg->addr = cpu_to_le64(req->mr->iova); + put_unaligned_le24(req->mr->length, sg->length); + put_unaligned_le32(req->mr->rkey, sg->key); + sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) | + NVME_SGL_FMT_INVALIDATE; + + return 0; +} + +static int nvme_rdma_map_data(struct nvme_rdma_queue *queue, + struct request *rq, struct nvme_command *c) +{ + struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); + struct nvme_rdma_device *dev = queue->device; + struct ib_device *ibdev = dev->dev; + int count, ret; + + req->num_sge = 1; + refcount_set(&req->ref, 2); /* send and recv completions */ + + c->common.flags |= NVME_CMD_SGL_METABUF; + + if (!blk_rq_payload_bytes(rq)) + return nvme_rdma_set_sg_null(c); + + req->sg_table.sgl = req->first_sgl; + ret = sg_alloc_table_chained(&req->sg_table, + blk_rq_nr_phys_segments(rq), req->sg_table.sgl); + if (ret) + return -ENOMEM; + + req->nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl); + + count = ib_dma_map_sg(ibdev, req->sg_table.sgl, req->nents, + rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); + if (unlikely(count <= 0)) { + ret = -EIO; + goto out_free_table; + } + + if (count <= dev->num_inline_segments) { + if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) && + queue->ctrl->use_inline_data && + blk_rq_payload_bytes(rq) <= + nvme_rdma_inline_data_size(queue)) { + ret = nvme_rdma_map_sg_inline(queue, req, c, count); + goto out; + } + + if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) { + ret = nvme_rdma_map_sg_single(queue, req, c); + goto out; + } + } + + ret = nvme_rdma_map_sg_fr(queue, req, c, count); +out: + if (unlikely(ret)) + goto out_unmap_sg; + + return 0; + +out_unmap_sg: + ib_dma_unmap_sg(ibdev, req->sg_table.sgl, + req->nents, rq_data_dir(rq) == + WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); +out_free_table: + sg_free_table_chained(&req->sg_table, true); + return ret; +} + +static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct nvme_rdma_qe *qe = + container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe); + struct nvme_rdma_request *req = + container_of(qe, struct nvme_rdma_request, sqe); + struct request *rq = blk_mq_rq_from_pdu(req); + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + nvme_rdma_wr_error(cq, wc, "SEND"); + return; + } + + if (refcount_dec_and_test(&req->ref)) + nvme_end_request(rq, req->status, req->result); +} + +static int nvme_rdma_post_send(struct nvme_rdma_queue *queue, + struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge, + struct ib_send_wr *first) +{ + struct ib_send_wr wr; + int ret; + + sge->addr = qe->dma; + sge->length = sizeof(struct nvme_command), + sge->lkey = queue->device->pd->local_dma_lkey; + + wr.next = NULL; + wr.wr_cqe = &qe->cqe; + wr.sg_list = sge; + wr.num_sge = num_sge; + wr.opcode = IB_WR_SEND; + wr.send_flags = IB_SEND_SIGNALED; + + if (first) + first->next = ≀ + else + first = ≀ + + ret = ib_post_send(queue->qp, first, NULL); + if (unlikely(ret)) { + dev_err(queue->ctrl->ctrl.device, + "%s failed with error code %d\n", __func__, ret); + } + return ret; +} + +static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue, + struct nvme_rdma_qe *qe) +{ + struct ib_recv_wr wr; + struct ib_sge list; + int ret; + + list.addr = qe->dma; + list.length = sizeof(struct nvme_completion); + list.lkey = queue->device->pd->local_dma_lkey; + + qe->cqe.done = nvme_rdma_recv_done; + + wr.next = NULL; + wr.wr_cqe = &qe->cqe; + wr.sg_list = &list; + wr.num_sge = 1; + + ret = ib_post_recv(queue->qp, &wr, NULL); + if (unlikely(ret)) { + dev_err(queue->ctrl->ctrl.device, + "%s failed with error code %d\n", __func__, ret); + } + return ret; +} + +static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue) +{ + u32 queue_idx = nvme_rdma_queue_idx(queue); + + if (queue_idx == 0) + return queue->ctrl->admin_tag_set.tags[queue_idx]; + return queue->ctrl->tag_set.tags[queue_idx - 1]; +} + +static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc) +{ + if (unlikely(wc->status != IB_WC_SUCCESS)) + nvme_rdma_wr_error(cq, wc, "ASYNC"); +} + +static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg) +{ + struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg); + struct nvme_rdma_queue *queue = &ctrl->queues[0]; + struct ib_device *dev = queue->device->dev; + struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe; + struct nvme_command *cmd = sqe->data; + struct ib_sge sge; + int ret; + + ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE); + + memset(cmd, 0, sizeof(*cmd)); + cmd->common.opcode = nvme_admin_async_event; + cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH; + cmd->common.flags |= NVME_CMD_SGL_METABUF; + nvme_rdma_set_sg_null(cmd); + + sqe->cqe.done = nvme_rdma_async_done; + + ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd), + DMA_TO_DEVICE); + + ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL); + WARN_ON_ONCE(ret); +} + +static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue, + struct nvme_completion *cqe, struct ib_wc *wc, int tag) +{ + struct request *rq; + struct nvme_rdma_request *req; + int ret = 0; + + rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id); + if (!rq) { + dev_err(queue->ctrl->ctrl.device, + "tag 0x%x on QP %#x not found\n", + cqe->command_id, queue->qp->qp_num); + nvme_rdma_error_recovery(queue->ctrl); + return ret; + } + req = blk_mq_rq_to_pdu(rq); + + req->status = cqe->status; + req->result = cqe->result; + + if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { + if (unlikely(wc->ex.invalidate_rkey != req->mr->rkey)) { + dev_err(queue->ctrl->ctrl.device, + "Bogus remote invalidation for rkey %#x\n", + req->mr->rkey); + nvme_rdma_error_recovery(queue->ctrl); + } + } else if (req->mr) { + ret = nvme_rdma_inv_rkey(queue, req); + if (unlikely(ret < 0)) { + dev_err(queue->ctrl->ctrl.device, + "Queueing INV WR for rkey %#x failed (%d)\n", + req->mr->rkey, ret); + nvme_rdma_error_recovery(queue->ctrl); + } + /* the local invalidation completion will end the request */ + return 0; + } + + if (refcount_dec_and_test(&req->ref)) { + if (rq->tag == tag) + ret = 1; + nvme_end_request(rq, req->status, req->result); + } + + return ret; +} + +static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag) +{ + struct nvme_rdma_qe *qe = + container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe); + struct nvme_rdma_queue *queue = cq->cq_context; + struct ib_device *ibdev = queue->device->dev; + struct nvme_completion *cqe = qe->data; + const size_t len = sizeof(struct nvme_completion); + int ret = 0; + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + nvme_rdma_wr_error(cq, wc, "RECV"); + return 0; + } + + ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE); + /* + * AEN requests are special as they don't time out and can + * survive any kind of queue freeze and often don't respond to + * aborts. We don't even bother to allocate a struct request + * for them but rather special case them here. + */ + if (unlikely(nvme_rdma_queue_idx(queue) == 0 && + cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) + nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, + &cqe->result); + else + ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag); + ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE); + + nvme_rdma_post_recv(queue, qe); + return ret; +} + +static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) +{ + __nvme_rdma_recv_done(cq, wc, -1); +} + +static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue) +{ + int ret, i; + + for (i = 0; i < queue->queue_size; i++) { + ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]); + if (ret) + goto out_destroy_queue_ib; + } + + return 0; + +out_destroy_queue_ib: + nvme_rdma_destroy_queue_ib(queue); + return ret; +} + +static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue, + struct rdma_cm_event *ev) +{ + struct rdma_cm_id *cm_id = queue->cm_id; + int status = ev->status; + const char *rej_msg; + const struct nvme_rdma_cm_rej *rej_data; + u8 rej_data_len; + + rej_msg = rdma_reject_msg(cm_id, status); + rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len); + + if (rej_data && rej_data_len >= sizeof(u16)) { + u16 sts = le16_to_cpu(rej_data->sts); + + dev_err(queue->ctrl->ctrl.device, + "Connect rejected: status %d (%s) nvme status %d (%s).\n", + status, rej_msg, sts, nvme_rdma_cm_msg(sts)); + } else { + dev_err(queue->ctrl->ctrl.device, + "Connect rejected: status %d (%s).\n", status, rej_msg); + } + + return -ECONNRESET; +} + +static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue) +{ + int ret; + + ret = nvme_rdma_create_queue_ib(queue); + if (ret) + return ret; + + ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS); + if (ret) { + dev_err(queue->ctrl->ctrl.device, + "rdma_resolve_route failed (%d).\n", + queue->cm_error); + goto out_destroy_queue; + } + + return 0; + +out_destroy_queue: + nvme_rdma_destroy_queue_ib(queue); + return ret; +} + +static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue) +{ + struct nvme_rdma_ctrl *ctrl = queue->ctrl; + struct rdma_conn_param param = { }; + struct nvme_rdma_cm_req priv = { }; + int ret; + + param.qp_num = queue->qp->qp_num; + param.flow_control = 1; + + param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom; + /* maximum retry count */ + param.retry_count = 7; + param.rnr_retry_count = 7; + param.private_data = &priv; + param.private_data_len = sizeof(priv); + + priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); + priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue)); + /* + * set the admin queue depth to the minimum size + * specified by the Fabrics standard. + */ + if (priv.qid == 0) { + priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH); + priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1); + } else { + /* + * current interpretation of the fabrics spec + * is at minimum you make hrqsize sqsize+1, or a + * 1's based representation of sqsize. + */ + priv.hrqsize = cpu_to_le16(queue->queue_size); + priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize); + } + + ret = rdma_connect(queue->cm_id, ¶m); + if (ret) { + dev_err(ctrl->ctrl.device, + "rdma_connect failed (%d).\n", ret); + goto out_destroy_queue_ib; + } + + return 0; + +out_destroy_queue_ib: + nvme_rdma_destroy_queue_ib(queue); + return ret; +} + +static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, + struct rdma_cm_event *ev) +{ + struct nvme_rdma_queue *queue = cm_id->context; + int cm_error = 0; + + dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n", + rdma_event_msg(ev->event), ev->event, + ev->status, cm_id); + + switch (ev->event) { + case RDMA_CM_EVENT_ADDR_RESOLVED: + cm_error = nvme_rdma_addr_resolved(queue); + break; + case RDMA_CM_EVENT_ROUTE_RESOLVED: + cm_error = nvme_rdma_route_resolved(queue); + break; + case RDMA_CM_EVENT_ESTABLISHED: + queue->cm_error = nvme_rdma_conn_established(queue); + /* complete cm_done regardless of success/failure */ + complete(&queue->cm_done); + return 0; + case RDMA_CM_EVENT_REJECTED: + cm_error = nvme_rdma_conn_rejected(queue, ev); + break; + case RDMA_CM_EVENT_ROUTE_ERROR: + case RDMA_CM_EVENT_CONNECT_ERROR: + case RDMA_CM_EVENT_UNREACHABLE: + nvme_rdma_destroy_queue_ib(queue); + /* fall through */ + case RDMA_CM_EVENT_ADDR_ERROR: + dev_dbg(queue->ctrl->ctrl.device, + "CM error event %d\n", ev->event); + cm_error = -ECONNRESET; + break; + case RDMA_CM_EVENT_DISCONNECTED: + case RDMA_CM_EVENT_ADDR_CHANGE: + case RDMA_CM_EVENT_TIMEWAIT_EXIT: + dev_dbg(queue->ctrl->ctrl.device, + "disconnect received - connection closed\n"); + nvme_rdma_error_recovery(queue->ctrl); + break; + case RDMA_CM_EVENT_DEVICE_REMOVAL: + /* device removal is handled via the ib_client API */ + break; + default: + dev_err(queue->ctrl->ctrl.device, + "Unexpected RDMA CM event (%d)\n", ev->event); + nvme_rdma_error_recovery(queue->ctrl); + break; + } + + if (cm_error) { + queue->cm_error = cm_error; + complete(&queue->cm_done); + } + + return 0; +} + +static enum blk_eh_timer_return +nvme_rdma_timeout(struct request *rq, bool reserved) +{ + struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); + struct nvme_rdma_queue *queue = req->queue; + struct nvme_rdma_ctrl *ctrl = queue->ctrl; + + dev_warn(ctrl->ctrl.device, "I/O %d QID %d timeout\n", + rq->tag, nvme_rdma_queue_idx(queue)); + + if (ctrl->ctrl.state != NVME_CTRL_LIVE) { + /* + * Teardown immediately if controller times out while starting + * or we are already started error recovery. all outstanding + * requests are completed on shutdown, so we return BLK_EH_DONE. + */ + flush_work(&ctrl->err_work); + nvme_rdma_teardown_io_queues(ctrl, false); + nvme_rdma_teardown_admin_queue(ctrl, false); + return BLK_EH_DONE; + } + + dev_warn(ctrl->ctrl.device, "starting error recovery\n"); + nvme_rdma_error_recovery(ctrl); + + return BLK_EH_RESET_TIMER; +} + +static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct nvme_ns *ns = hctx->queue->queuedata; + struct nvme_rdma_queue *queue = hctx->driver_data; + struct request *rq = bd->rq; + struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); + struct nvme_rdma_qe *sqe = &req->sqe; + struct nvme_command *c = sqe->data; + struct ib_device *dev; + bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags); + blk_status_t ret; + int err; + + WARN_ON_ONCE(rq->tag < 0); + + if (!nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready)) + return nvmf_fail_nonready_command(&queue->ctrl->ctrl, rq); + + dev = queue->device->dev; + ib_dma_sync_single_for_cpu(dev, sqe->dma, + sizeof(struct nvme_command), DMA_TO_DEVICE); + + ret = nvme_setup_cmd(ns, rq, c); + if (ret) + return ret; + + blk_mq_start_request(rq); + + err = nvme_rdma_map_data(queue, rq, c); + if (unlikely(err < 0)) { + dev_err(queue->ctrl->ctrl.device, + "Failed to map data (%d)\n", err); + nvme_cleanup_cmd(rq); + goto err; + } + + sqe->cqe.done = nvme_rdma_send_done; + + ib_dma_sync_single_for_device(dev, sqe->dma, + sizeof(struct nvme_command), DMA_TO_DEVICE); + + err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge, + req->mr ? &req->reg_wr.wr : NULL); + if (unlikely(err)) { + nvme_rdma_unmap_data(queue, rq); + goto err; + } + + return BLK_STS_OK; +err: + if (err == -ENOMEM || err == -EAGAIN) + return BLK_STS_RESOURCE; + return BLK_STS_IOERR; +} + +static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) +{ + struct nvme_rdma_queue *queue = hctx->driver_data; + struct ib_cq *cq = queue->ib_cq; + struct ib_wc wc; + int found = 0; + + while (ib_poll_cq(cq, 1, &wc) > 0) { + struct ib_cqe *cqe = wc.wr_cqe; + + if (cqe) { + if (cqe->done == nvme_rdma_recv_done) + found |= __nvme_rdma_recv_done(cq, &wc, tag); + else + cqe->done(cq, &wc); + } + } + + return found; +} + +static void nvme_rdma_complete_rq(struct request *rq) +{ + struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); + + nvme_rdma_unmap_data(req->queue, rq); + nvme_complete_rq(rq); +} + +static int nvme_rdma_map_queues(struct blk_mq_tag_set *set) +{ + struct nvme_rdma_ctrl *ctrl = set->driver_data; + + return blk_mq_rdma_map_queues(set, ctrl->device->dev, 0); +} + +static const struct blk_mq_ops nvme_rdma_mq_ops = { + .queue_rq = nvme_rdma_queue_rq, + .complete = nvme_rdma_complete_rq, + .init_request = nvme_rdma_init_request, + .exit_request = nvme_rdma_exit_request, + .init_hctx = nvme_rdma_init_hctx, + .poll = nvme_rdma_poll, + .timeout = nvme_rdma_timeout, + .map_queues = nvme_rdma_map_queues, +}; + +static const struct blk_mq_ops nvme_rdma_admin_mq_ops = { + .queue_rq = nvme_rdma_queue_rq, + .complete = nvme_rdma_complete_rq, + .init_request = nvme_rdma_init_request, + .exit_request = nvme_rdma_exit_request, + .init_hctx = nvme_rdma_init_admin_hctx, + .timeout = nvme_rdma_timeout, +}; + +static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown) +{ + nvme_rdma_teardown_io_queues(ctrl, shutdown); + if (shutdown) + nvme_shutdown_ctrl(&ctrl->ctrl); + else + nvme_disable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); + nvme_rdma_teardown_admin_queue(ctrl, shutdown); +} + +static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl) +{ + nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true); +} + +static void nvme_rdma_reset_ctrl_work(struct work_struct *work) +{ + struct nvme_rdma_ctrl *ctrl = + container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work); + + nvme_stop_ctrl(&ctrl->ctrl); + nvme_rdma_shutdown_ctrl(ctrl, false); + + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { + /* state change failure should never happen */ + WARN_ON_ONCE(1); + return; + } + + if (nvme_rdma_setup_ctrl(ctrl, false)) + goto out_fail; + + return; + +out_fail: + ++ctrl->ctrl.nr_reconnects; + nvme_rdma_reconnect_or_remove(ctrl); +} + +static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { + .name = "rdma", + .module = THIS_MODULE, + .flags = NVME_F_FABRICS, + .reg_read32 = nvmf_reg_read32, + .reg_read64 = nvmf_reg_read64, + .reg_write32 = nvmf_reg_write32, + .free_ctrl = nvme_rdma_free_ctrl, + .submit_async_event = nvme_rdma_submit_async_event, + .delete_ctrl = nvme_rdma_delete_ctrl, + .get_address = nvmf_get_address, + .stop_ctrl = nvme_rdma_stop_ctrl, +}; + +static inline bool +__nvme_rdma_options_match(struct nvme_rdma_ctrl *ctrl, + struct nvmf_ctrl_options *opts) +{ + char *stdport = __stringify(NVME_RDMA_IP_PORT); + + + if (!nvmf_ctlr_matches_baseopts(&ctrl->ctrl, opts) || + strcmp(opts->traddr, ctrl->ctrl.opts->traddr)) + return false; + + if (opts->mask & NVMF_OPT_TRSVCID && + ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) { + if (strcmp(opts->trsvcid, ctrl->ctrl.opts->trsvcid)) + return false; + } else if (opts->mask & NVMF_OPT_TRSVCID) { + if (strcmp(opts->trsvcid, stdport)) + return false; + } else if (ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) { + if (strcmp(stdport, ctrl->ctrl.opts->trsvcid)) + return false; + } + /* else, it's a match as both have stdport. Fall to next checks */ + + /* + * checking the local address is rough. In most cases, one + * is not specified and the host port is selected by the stack. + * + * Assume no match if: + * local address is specified and address is not the same + * local address is not specified but remote is, or vice versa + * (admin using specific host_traddr when it matters). + */ + if (opts->mask & NVMF_OPT_HOST_TRADDR && + ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR) { + if (strcmp(opts->host_traddr, ctrl->ctrl.opts->host_traddr)) + return false; + } else if (opts->mask & NVMF_OPT_HOST_TRADDR || + ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR) + return false; + /* + * if neither controller had an host port specified, assume it's + * a match as everything else matched. + */ + + return true; +} + +/* + * Fails a connection request if it matches an existing controller + * (association) with the same tuple: + * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN> + * + * if local address is not specified in the request, it will match an + * existing controller with all the other parameters the same and no + * local port address specified as well. + * + * The ports don't need to be compared as they are intrinsically + * already matched by the port pointers supplied. + */ +static bool +nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts) +{ + struct nvme_rdma_ctrl *ctrl; + bool found = false; + + mutex_lock(&nvme_rdma_ctrl_mutex); + list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) { + found = __nvme_rdma_options_match(ctrl, opts); + if (found) + break; + } + mutex_unlock(&nvme_rdma_ctrl_mutex); + + return found; +} + +static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev, + struct nvmf_ctrl_options *opts) +{ + struct nvme_rdma_ctrl *ctrl; + int ret; + bool changed; + char *port; + + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + return ERR_PTR(-ENOMEM); + ctrl->ctrl.opts = opts; + INIT_LIST_HEAD(&ctrl->list); + mutex_init(&ctrl->teardown_lock); + + if (opts->mask & NVMF_OPT_TRSVCID) + port = opts->trsvcid; + else + port = __stringify(NVME_RDMA_IP_PORT); + + ret = inet_pton_with_scope(&init_net, AF_UNSPEC, + opts->traddr, port, &ctrl->addr); + if (ret) { + pr_err("malformed address passed: %s:%s\n", opts->traddr, port); + goto out_free_ctrl; + } + + if (opts->mask & NVMF_OPT_HOST_TRADDR) { + ret = inet_pton_with_scope(&init_net, AF_UNSPEC, + opts->host_traddr, NULL, &ctrl->src_addr); + if (ret) { + pr_err("malformed src address passed: %s\n", + opts->host_traddr); + goto out_free_ctrl; + } + } + + if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) { + ret = -EALREADY; + goto out_free_ctrl; + } + + INIT_DELAYED_WORK(&ctrl->reconnect_work, + nvme_rdma_reconnect_ctrl_work); + INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work); + INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work); + + ctrl->ctrl.queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */ + ctrl->ctrl.sqsize = opts->queue_size - 1; + ctrl->ctrl.kato = opts->kato; + + ret = -ENOMEM; + ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues), + GFP_KERNEL); + if (!ctrl->queues) + goto out_free_ctrl; + + ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops, + 0 /* no quirks, we're perfect! */); + if (ret) + goto out_kfree_queues; + + changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING); + WARN_ON_ONCE(!changed); + + ret = nvme_rdma_setup_ctrl(ctrl, true); + if (ret) + goto out_uninit_ctrl; + + dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n", + ctrl->ctrl.opts->subsysnqn, &ctrl->addr); + + nvme_get_ctrl(&ctrl->ctrl); + + mutex_lock(&nvme_rdma_ctrl_mutex); + list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list); + mutex_unlock(&nvme_rdma_ctrl_mutex); + + return &ctrl->ctrl; + +out_uninit_ctrl: + nvme_uninit_ctrl(&ctrl->ctrl); + nvme_put_ctrl(&ctrl->ctrl); + if (ret > 0) + ret = -EIO; + return ERR_PTR(ret); +out_kfree_queues: + kfree(ctrl->queues); +out_free_ctrl: + kfree(ctrl); + return ERR_PTR(ret); +} + +static struct nvmf_transport_ops nvme_rdma_transport = { + .name = "rdma", + .module = THIS_MODULE, + .required_opts = NVMF_OPT_TRADDR, + .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY | + NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO, + .create_ctrl = nvme_rdma_create_ctrl, +}; + +static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data) +{ + struct nvme_rdma_ctrl *ctrl; + struct nvme_rdma_device *ndev; + bool found = false; + + mutex_lock(&device_list_mutex); + list_for_each_entry(ndev, &device_list, entry) { + if (ndev->dev == ib_device) { + found = true; + break; + } + } + mutex_unlock(&device_list_mutex); + + if (!found) + return; + + /* Delete all controllers using this device */ + mutex_lock(&nvme_rdma_ctrl_mutex); + list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) { + if (ctrl->device->dev != ib_device) + continue; + nvme_delete_ctrl(&ctrl->ctrl); + } + mutex_unlock(&nvme_rdma_ctrl_mutex); + + flush_workqueue(nvme_delete_wq); +} + +static struct ib_client nvme_rdma_ib_client = { + .name = "nvme_rdma", + .remove = nvme_rdma_remove_one +}; + +static int __init nvme_rdma_init_module(void) +{ + int ret; + + ret = ib_register_client(&nvme_rdma_ib_client); + if (ret) + return ret; + + ret = nvmf_register_transport(&nvme_rdma_transport); + if (ret) + goto err_unreg_client; + + return 0; + +err_unreg_client: + ib_unregister_client(&nvme_rdma_ib_client); + return ret; +} + +static void __exit nvme_rdma_cleanup_module(void) +{ + nvmf_unregister_transport(&nvme_rdma_transport); + ib_unregister_client(&nvme_rdma_ib_client); +} + +module_init(nvme_rdma_init_module); +module_exit(nvme_rdma_cleanup_module); + +MODULE_LICENSE("GPL v2"); diff --git a/drivers/nvme/host/trace.c b/drivers/nvme/host/trace.c new file mode 100644 index 000000000..25b0e310f --- /dev/null +++ b/drivers/nvme/host/trace.c @@ -0,0 +1,141 @@ +/* + * NVM Express device driver tracepoints + * Copyright (c) 2018 Johannes Thumshirn, SUSE Linux GmbH + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <asm/unaligned.h> +#include "trace.h" + +static const char *nvme_trace_create_sq(struct trace_seq *p, u8 *cdw10) +{ + const char *ret = trace_seq_buffer_ptr(p); + u16 sqid = get_unaligned_le16(cdw10); + u16 qsize = get_unaligned_le16(cdw10 + 2); + u16 sq_flags = get_unaligned_le16(cdw10 + 4); + u16 cqid = get_unaligned_le16(cdw10 + 6); + + + trace_seq_printf(p, "sqid=%u, qsize=%u, sq_flags=0x%x, cqid=%u", + sqid, qsize, sq_flags, cqid); + trace_seq_putc(p, 0); + + return ret; +} + +static const char *nvme_trace_create_cq(struct trace_seq *p, u8 *cdw10) +{ + const char *ret = trace_seq_buffer_ptr(p); + u16 cqid = get_unaligned_le16(cdw10); + u16 qsize = get_unaligned_le16(cdw10 + 2); + u16 cq_flags = get_unaligned_le16(cdw10 + 4); + u16 irq_vector = get_unaligned_le16(cdw10 + 6); + + trace_seq_printf(p, "cqid=%u, qsize=%u, cq_flags=0x%x, irq_vector=%u", + cqid, qsize, cq_flags, irq_vector); + trace_seq_putc(p, 0); + + return ret; +} + +static const char *nvme_trace_admin_identify(struct trace_seq *p, u8 *cdw10) +{ + const char *ret = trace_seq_buffer_ptr(p); + u8 cns = cdw10[0]; + u16 ctrlid = get_unaligned_le16(cdw10 + 2); + + trace_seq_printf(p, "cns=%u, ctrlid=%u", cns, ctrlid); + trace_seq_putc(p, 0); + + return ret; +} + + + +static const char *nvme_trace_read_write(struct trace_seq *p, u8 *cdw10) +{ + const char *ret = trace_seq_buffer_ptr(p); + u64 slba = get_unaligned_le64(cdw10); + u16 length = get_unaligned_le16(cdw10 + 8); + u16 control = get_unaligned_le16(cdw10 + 10); + u32 dsmgmt = get_unaligned_le32(cdw10 + 12); + u32 reftag = get_unaligned_le32(cdw10 + 16); + + trace_seq_printf(p, + "slba=%llu, len=%u, ctrl=0x%x, dsmgmt=%u, reftag=%u", + slba, length, control, dsmgmt, reftag); + trace_seq_putc(p, 0); + + return ret; +} + +static const char *nvme_trace_dsm(struct trace_seq *p, u8 *cdw10) +{ + const char *ret = trace_seq_buffer_ptr(p); + + trace_seq_printf(p, "nr=%u, attributes=%u", + get_unaligned_le32(cdw10), + get_unaligned_le32(cdw10 + 4)); + trace_seq_putc(p, 0); + + return ret; +} + +static const char *nvme_trace_common(struct trace_seq *p, u8 *cdw10) +{ + const char *ret = trace_seq_buffer_ptr(p); + + trace_seq_printf(p, "cdw10=%*ph", 24, cdw10); + trace_seq_putc(p, 0); + + return ret; +} + +const char *nvme_trace_parse_admin_cmd(struct trace_seq *p, + u8 opcode, u8 *cdw10) +{ + switch (opcode) { + case nvme_admin_create_sq: + return nvme_trace_create_sq(p, cdw10); + case nvme_admin_create_cq: + return nvme_trace_create_cq(p, cdw10); + case nvme_admin_identify: + return nvme_trace_admin_identify(p, cdw10); + default: + return nvme_trace_common(p, cdw10); + } +} + +const char *nvme_trace_parse_nvm_cmd(struct trace_seq *p, + u8 opcode, u8 *cdw10) +{ + switch (opcode) { + case nvme_cmd_read: + case nvme_cmd_write: + case nvme_cmd_write_zeroes: + return nvme_trace_read_write(p, cdw10); + case nvme_cmd_dsm: + return nvme_trace_dsm(p, cdw10); + default: + return nvme_trace_common(p, cdw10); + } +} + +const char *nvme_trace_disk_name(struct trace_seq *p, char *name) +{ + const char *ret = trace_seq_buffer_ptr(p); + + if (*name) + trace_seq_printf(p, "disk=%s, ", name); + trace_seq_putc(p, 0); + + return ret; +} diff --git a/drivers/nvme/host/trace.h b/drivers/nvme/host/trace.h new file mode 100644 index 000000000..a490790d6 --- /dev/null +++ b/drivers/nvme/host/trace.h @@ -0,0 +1,167 @@ +/* + * NVM Express device driver tracepoints + * Copyright (c) 2018 Johannes Thumshirn, SUSE Linux GmbH + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM nvme + +#if !defined(_TRACE_NVME_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_NVME_H + +#include <linux/nvme.h> +#include <linux/tracepoint.h> +#include <linux/trace_seq.h> + +#include "nvme.h" + +#define nvme_admin_opcode_name(opcode) { opcode, #opcode } +#define show_admin_opcode_name(val) \ + __print_symbolic(val, \ + nvme_admin_opcode_name(nvme_admin_delete_sq), \ + nvme_admin_opcode_name(nvme_admin_create_sq), \ + nvme_admin_opcode_name(nvme_admin_get_log_page), \ + nvme_admin_opcode_name(nvme_admin_delete_cq), \ + nvme_admin_opcode_name(nvme_admin_create_cq), \ + nvme_admin_opcode_name(nvme_admin_identify), \ + nvme_admin_opcode_name(nvme_admin_abort_cmd), \ + nvme_admin_opcode_name(nvme_admin_set_features), \ + nvme_admin_opcode_name(nvme_admin_get_features), \ + nvme_admin_opcode_name(nvme_admin_async_event), \ + nvme_admin_opcode_name(nvme_admin_ns_mgmt), \ + nvme_admin_opcode_name(nvme_admin_activate_fw), \ + nvme_admin_opcode_name(nvme_admin_download_fw), \ + nvme_admin_opcode_name(nvme_admin_ns_attach), \ + nvme_admin_opcode_name(nvme_admin_keep_alive), \ + nvme_admin_opcode_name(nvme_admin_directive_send), \ + nvme_admin_opcode_name(nvme_admin_directive_recv), \ + nvme_admin_opcode_name(nvme_admin_dbbuf), \ + nvme_admin_opcode_name(nvme_admin_format_nvm), \ + nvme_admin_opcode_name(nvme_admin_security_send), \ + nvme_admin_opcode_name(nvme_admin_security_recv), \ + nvme_admin_opcode_name(nvme_admin_sanitize_nvm)) + +#define nvme_opcode_name(opcode) { opcode, #opcode } +#define show_nvm_opcode_name(val) \ + __print_symbolic(val, \ + nvme_opcode_name(nvme_cmd_flush), \ + nvme_opcode_name(nvme_cmd_write), \ + nvme_opcode_name(nvme_cmd_read), \ + nvme_opcode_name(nvme_cmd_write_uncor), \ + nvme_opcode_name(nvme_cmd_compare), \ + nvme_opcode_name(nvme_cmd_write_zeroes), \ + nvme_opcode_name(nvme_cmd_dsm), \ + nvme_opcode_name(nvme_cmd_resv_register), \ + nvme_opcode_name(nvme_cmd_resv_report), \ + nvme_opcode_name(nvme_cmd_resv_acquire), \ + nvme_opcode_name(nvme_cmd_resv_release)) + +#define show_opcode_name(qid, opcode) \ + (qid ? show_nvm_opcode_name(opcode) : show_admin_opcode_name(opcode)) + +const char *nvme_trace_parse_admin_cmd(struct trace_seq *p, u8 opcode, + u8 *cdw10); +const char *nvme_trace_parse_nvm_cmd(struct trace_seq *p, u8 opcode, + u8 *cdw10); + +#define parse_nvme_cmd(qid, opcode, cdw10) \ + (qid ? \ + nvme_trace_parse_nvm_cmd(p, opcode, cdw10) : \ + nvme_trace_parse_admin_cmd(p, opcode, cdw10)) + +const char *nvme_trace_disk_name(struct trace_seq *p, char *name); +#define __print_disk_name(name) \ + nvme_trace_disk_name(p, name) + +#ifndef TRACE_HEADER_MULTI_READ +static inline void __assign_disk_name(char *name, struct gendisk *disk) +{ + if (disk) + memcpy(name, disk->disk_name, DISK_NAME_LEN); + else + memset(name, 0, DISK_NAME_LEN); +} +#endif + +TRACE_EVENT(nvme_setup_cmd, + TP_PROTO(struct request *req, struct nvme_command *cmd), + TP_ARGS(req, cmd), + TP_STRUCT__entry( + __array(char, disk, DISK_NAME_LEN) + __field(int, ctrl_id) + __field(int, qid) + __field(u8, opcode) + __field(u8, flags) + __field(u16, cid) + __field(u32, nsid) + __field(u64, metadata) + __array(u8, cdw10, 24) + ), + TP_fast_assign( + __entry->ctrl_id = nvme_req(req)->ctrl->instance; + __entry->qid = nvme_req_qid(req); + __entry->opcode = cmd->common.opcode; + __entry->flags = cmd->common.flags; + __entry->cid = cmd->common.command_id; + __entry->nsid = le32_to_cpu(cmd->common.nsid); + __entry->metadata = le64_to_cpu(cmd->common.metadata); + __assign_disk_name(__entry->disk, req->rq_disk); + memcpy(__entry->cdw10, cmd->common.cdw10, + sizeof(__entry->cdw10)); + ), + TP_printk("nvme%d: %sqid=%d, cmdid=%u, nsid=%u, flags=0x%x, meta=0x%llx, cmd=(%s %s)", + __entry->ctrl_id, __print_disk_name(__entry->disk), + __entry->qid, __entry->cid, __entry->nsid, + __entry->flags, __entry->metadata, + show_opcode_name(__entry->qid, __entry->opcode), + parse_nvme_cmd(__entry->qid, __entry->opcode, __entry->cdw10)) +); + +TRACE_EVENT(nvme_complete_rq, + TP_PROTO(struct request *req), + TP_ARGS(req), + TP_STRUCT__entry( + __array(char, disk, DISK_NAME_LEN) + __field(int, ctrl_id) + __field(int, qid) + __field(int, cid) + __field(u64, result) + __field(u8, retries) + __field(u8, flags) + __field(u16, status) + ), + TP_fast_assign( + __entry->ctrl_id = nvme_req(req)->ctrl->instance; + __entry->qid = nvme_req_qid(req); + __entry->cid = req->tag; + __entry->result = le64_to_cpu(nvme_req(req)->result.u64); + __entry->retries = nvme_req(req)->retries; + __entry->flags = nvme_req(req)->flags; + __entry->status = nvme_req(req)->status; + __assign_disk_name(__entry->disk, req->rq_disk); + ), + TP_printk("nvme%d: %sqid=%d, cmdid=%u, res=%llu, retries=%u, flags=0x%x, status=%u", + __entry->ctrl_id, __print_disk_name(__entry->disk), + __entry->qid, __entry->cid, __entry->result, + __entry->retries, __entry->flags, __entry->status) + +); + +#endif /* _TRACE_NVME_H */ + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE trace + +/* This part must be outside protection */ +#include <trace/define_trace.h> diff --git a/drivers/nvme/target/Kconfig b/drivers/nvme/target/Kconfig new file mode 100644 index 000000000..3c7b61ddb --- /dev/null +++ b/drivers/nvme/target/Kconfig @@ -0,0 +1,62 @@ + +config NVME_TARGET + tristate "NVMe Target support" + depends on BLOCK + depends on CONFIGFS_FS + help + This enabled target side support for the NVMe protocol, that is + it allows the Linux kernel to implement NVMe subsystems and + controllers and export Linux block devices as NVMe namespaces. + You need to select at least one of the transports below to make this + functionality useful. + + To configure the NVMe target you probably want to use the nvmetcli + tool from http://git.infradead.org/users/hch/nvmetcli.git. + +config NVME_TARGET_LOOP + tristate "NVMe loopback device support" + depends on NVME_TARGET + select NVME_CORE + select NVME_FABRICS + select SG_POOL + help + This enables the NVMe loopback device support, which can be useful + to test NVMe host and target side features. + + If unsure, say N. + +config NVME_TARGET_RDMA + tristate "NVMe over Fabrics RDMA target support" + depends on INFINIBAND && INFINIBAND_ADDR_TRANS + depends on NVME_TARGET + select SGL_ALLOC + help + This enables the NVMe RDMA target support, which allows exporting NVMe + devices over RDMA. + + If unsure, say N. + +config NVME_TARGET_FC + tristate "NVMe over Fabrics FC target driver" + depends on NVME_TARGET + depends on HAS_DMA + select SGL_ALLOC + help + This enables the NVMe FC target support, which allows exporting NVMe + devices over FC. + + If unsure, say N. + +config NVME_TARGET_FCLOOP + tristate "NVMe over Fabrics FC Transport Loopback Test driver" + depends on NVME_TARGET + select NVME_CORE + select NVME_FABRICS + select SG_POOL + depends on NVME_FC + depends on NVME_TARGET_FC + help + This enables the NVMe FC loopback test support, which can be useful + to test NVMe-FC transport interfaces. + + If unsure, say N. diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile new file mode 100644 index 000000000..8118c9339 --- /dev/null +++ b/drivers/nvme/target/Makefile @@ -0,0 +1,14 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_NVME_TARGET) += nvmet.o +obj-$(CONFIG_NVME_TARGET_LOOP) += nvme-loop.o +obj-$(CONFIG_NVME_TARGET_RDMA) += nvmet-rdma.o +obj-$(CONFIG_NVME_TARGET_FC) += nvmet-fc.o +obj-$(CONFIG_NVME_TARGET_FCLOOP) += nvme-fcloop.o + +nvmet-y += core.o configfs.o admin-cmd.o fabrics-cmd.o \ + discovery.o io-cmd-file.o io-cmd-bdev.o +nvme-loop-y += loop.o +nvmet-rdma-y += rdma.o +nvmet-fc-y += fc.o +nvme-fcloop-y += fcloop.o diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c new file mode 100644 index 000000000..a8eb8784e --- /dev/null +++ b/drivers/nvme/target/admin-cmd.c @@ -0,0 +1,842 @@ +/* + * NVMe admin command implementation. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/module.h> +#include <linux/rculist.h> + +#include <generated/utsrelease.h> +#include <asm/unaligned.h> +#include "nvmet.h" + +/* + * This helper allows us to clear the AEN based on the RAE bit, + * Please use this helper when processing the log pages which are + * associated with the AEN. + */ +static inline void nvmet_clear_aen(struct nvmet_req *req, u32 aen_bit) +{ + int rae = le32_to_cpu(req->cmd->common.cdw10[0]) & 1 << 15; + + if (!rae) + clear_bit(aen_bit, &req->sq->ctrl->aen_masked); +} + +u32 nvmet_get_log_page_len(struct nvme_command *cmd) +{ + u32 len = le16_to_cpu(cmd->get_log_page.numdu); + + len <<= 16; + len += le16_to_cpu(cmd->get_log_page.numdl); + /* NUMD is a 0's based value */ + len += 1; + len *= sizeof(u32); + + return len; +} + +static void nvmet_execute_get_log_page_noop(struct nvmet_req *req) +{ + nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->data_len)); +} + +static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req, + struct nvme_smart_log *slog) +{ + struct nvmet_ns *ns; + u64 host_reads, host_writes, data_units_read, data_units_written; + + ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid); + if (!ns) { + pr_err("nvmet : Could not find namespace id : %d\n", + le32_to_cpu(req->cmd->get_log_page.nsid)); + return NVME_SC_INVALID_NS; + } + + /* we don't have the right data for file backed ns */ + if (!ns->bdev) + goto out; + + host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]); + data_units_read = DIV_ROUND_UP(part_stat_read(ns->bdev->bd_part, + sectors[READ]), 1000); + host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]); + data_units_written = DIV_ROUND_UP(part_stat_read(ns->bdev->bd_part, + sectors[WRITE]), 1000); + + put_unaligned_le64(host_reads, &slog->host_reads[0]); + put_unaligned_le64(data_units_read, &slog->data_units_read[0]); + put_unaligned_le64(host_writes, &slog->host_writes[0]); + put_unaligned_le64(data_units_written, &slog->data_units_written[0]); +out: + nvmet_put_namespace(ns); + + return NVME_SC_SUCCESS; +} + +static u16 nvmet_get_smart_log_all(struct nvmet_req *req, + struct nvme_smart_log *slog) +{ + u64 host_reads = 0, host_writes = 0; + u64 data_units_read = 0, data_units_written = 0; + struct nvmet_ns *ns; + struct nvmet_ctrl *ctrl; + + ctrl = req->sq->ctrl; + + rcu_read_lock(); + list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) { + /* we don't have the right data for file backed ns */ + if (!ns->bdev) + continue; + host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]); + data_units_read += DIV_ROUND_UP( + part_stat_read(ns->bdev->bd_part, sectors[READ]), 1000); + host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]); + data_units_written += DIV_ROUND_UP( + part_stat_read(ns->bdev->bd_part, sectors[WRITE]), 1000); + + } + rcu_read_unlock(); + + put_unaligned_le64(host_reads, &slog->host_reads[0]); + put_unaligned_le64(data_units_read, &slog->data_units_read[0]); + put_unaligned_le64(host_writes, &slog->host_writes[0]); + put_unaligned_le64(data_units_written, &slog->data_units_written[0]); + + return NVME_SC_SUCCESS; +} + +static void nvmet_execute_get_log_page_smart(struct nvmet_req *req) +{ + struct nvme_smart_log *log; + u16 status = NVME_SC_INTERNAL; + + if (req->data_len != sizeof(*log)) + goto out; + + log = kzalloc(sizeof(*log), GFP_KERNEL); + if (!log) + goto out; + + if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL)) + status = nvmet_get_smart_log_all(req, log); + else + status = nvmet_get_smart_log_nsid(req, log); + if (status) + goto out_free_log; + + status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log)); +out_free_log: + kfree(log); +out: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_get_log_cmd_effects_ns(struct nvmet_req *req) +{ + u16 status = NVME_SC_INTERNAL; + struct nvme_effects_log *log; + + log = kzalloc(sizeof(*log), GFP_KERNEL); + if (!log) + goto out; + + log->acs[nvme_admin_get_log_page] = cpu_to_le32(1 << 0); + log->acs[nvme_admin_identify] = cpu_to_le32(1 << 0); + log->acs[nvme_admin_abort_cmd] = cpu_to_le32(1 << 0); + log->acs[nvme_admin_set_features] = cpu_to_le32(1 << 0); + log->acs[nvme_admin_get_features] = cpu_to_le32(1 << 0); + log->acs[nvme_admin_async_event] = cpu_to_le32(1 << 0); + log->acs[nvme_admin_keep_alive] = cpu_to_le32(1 << 0); + + log->iocs[nvme_cmd_read] = cpu_to_le32(1 << 0); + log->iocs[nvme_cmd_write] = cpu_to_le32(1 << 0); + log->iocs[nvme_cmd_flush] = cpu_to_le32(1 << 0); + log->iocs[nvme_cmd_dsm] = cpu_to_le32(1 << 0); + log->iocs[nvme_cmd_write_zeroes] = cpu_to_le32(1 << 0); + + status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log)); + + kfree(log); +out: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_get_log_changed_ns(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + u16 status = NVME_SC_INTERNAL; + size_t len; + + if (req->data_len != NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32)) + goto out; + + mutex_lock(&ctrl->lock); + if (ctrl->nr_changed_ns == U32_MAX) + len = sizeof(__le32); + else + len = ctrl->nr_changed_ns * sizeof(__le32); + status = nvmet_copy_to_sgl(req, 0, ctrl->changed_ns_list, len); + if (!status) + status = nvmet_zero_sgl(req, len, req->data_len - len); + ctrl->nr_changed_ns = 0; + nvmet_clear_aen(req, NVME_AEN_CFG_NS_ATTR); + mutex_unlock(&ctrl->lock); +out: + nvmet_req_complete(req, status); +} + +static u32 nvmet_format_ana_group(struct nvmet_req *req, u32 grpid, + struct nvme_ana_group_desc *desc) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + struct nvmet_ns *ns; + u32 count = 0; + + if (!(req->cmd->get_log_page.lsp & NVME_ANA_LOG_RGO)) { + rcu_read_lock(); + list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) + if (ns->anagrpid == grpid) + desc->nsids[count++] = cpu_to_le32(ns->nsid); + rcu_read_unlock(); + } + + desc->grpid = cpu_to_le32(grpid); + desc->nnsids = cpu_to_le32(count); + desc->chgcnt = cpu_to_le64(nvmet_ana_chgcnt); + desc->state = req->port->ana_state[grpid]; + memset(desc->rsvd17, 0, sizeof(desc->rsvd17)); + return sizeof(struct nvme_ana_group_desc) + count * sizeof(__le32); +} + +static void nvmet_execute_get_log_page_ana(struct nvmet_req *req) +{ + struct nvme_ana_rsp_hdr hdr = { 0, }; + struct nvme_ana_group_desc *desc; + size_t offset = sizeof(struct nvme_ana_rsp_hdr); /* start beyond hdr */ + size_t len; + u32 grpid; + u16 ngrps = 0; + u16 status; + + status = NVME_SC_INTERNAL; + desc = kmalloc(sizeof(struct nvme_ana_group_desc) + + NVMET_MAX_NAMESPACES * sizeof(__le32), GFP_KERNEL); + if (!desc) + goto out; + + down_read(&nvmet_ana_sem); + for (grpid = 1; grpid <= NVMET_MAX_ANAGRPS; grpid++) { + if (!nvmet_ana_group_enabled[grpid]) + continue; + len = nvmet_format_ana_group(req, grpid, desc); + status = nvmet_copy_to_sgl(req, offset, desc, len); + if (status) + break; + offset += len; + ngrps++; + } + for ( ; grpid <= NVMET_MAX_ANAGRPS; grpid++) { + if (nvmet_ana_group_enabled[grpid]) + ngrps++; + } + + hdr.chgcnt = cpu_to_le64(nvmet_ana_chgcnt); + hdr.ngrps = cpu_to_le16(ngrps); + nvmet_clear_aen(req, NVME_AEN_CFG_ANA_CHANGE); + up_read(&nvmet_ana_sem); + + kfree(desc); + + /* copy the header last once we know the number of groups */ + status = nvmet_copy_to_sgl(req, 0, &hdr, sizeof(hdr)); +out: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_identify_ctrl(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + struct nvme_id_ctrl *id; + u16 status = 0; + const char model[] = "Linux"; + + id = kzalloc(sizeof(*id), GFP_KERNEL); + if (!id) { + status = NVME_SC_INTERNAL; + goto out; + } + + /* XXX: figure out how to assign real vendors IDs. */ + id->vid = 0; + id->ssvid = 0; + + memset(id->sn, ' ', sizeof(id->sn)); + bin2hex(id->sn, &ctrl->subsys->serial, + min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2)); + memcpy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1, ' '); + memcpy_and_pad(id->fr, sizeof(id->fr), + UTS_RELEASE, strlen(UTS_RELEASE), ' '); + + id->rab = 6; + + /* + * XXX: figure out how we can assign a IEEE OUI, but until then + * the safest is to leave it as zeroes. + */ + + /* we support multiple ports, multiples hosts and ANA: */ + id->cmic = (1 << 0) | (1 << 1) | (1 << 3); + + /* no limit on data transfer sizes for now */ + id->mdts = 0; + id->cntlid = cpu_to_le16(ctrl->cntlid); + id->ver = cpu_to_le32(ctrl->subsys->ver); + + /* XXX: figure out what to do about RTD3R/RTD3 */ + id->oaes = cpu_to_le32(NVMET_AEN_CFG_OPTIONAL); + id->ctratt = cpu_to_le32(1 << 0); + + id->oacs = 0; + + /* + * We don't really have a practical limit on the number of abort + * comands. But we don't do anything useful for abort either, so + * no point in allowing more abort commands than the spec requires. + */ + id->acl = 3; + + id->aerl = NVMET_ASYNC_EVENTS - 1; + + /* first slot is read-only, only one slot supported */ + id->frmw = (1 << 0) | (1 << 1); + id->lpa = (1 << 0) | (1 << 1) | (1 << 2); + id->elpe = NVMET_ERROR_LOG_SLOTS - 1; + id->npss = 0; + + /* We support keep-alive timeout in granularity of seconds */ + id->kas = cpu_to_le16(NVMET_KAS); + + id->sqes = (0x6 << 4) | 0x6; + id->cqes = (0x4 << 4) | 0x4; + + /* no enforcement soft-limit for maxcmd - pick arbitrary high value */ + id->maxcmd = cpu_to_le16(NVMET_MAX_CMD); + + id->nn = cpu_to_le32(ctrl->subsys->max_nsid); + id->mnan = cpu_to_le32(NVMET_MAX_NAMESPACES); + id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM | + NVME_CTRL_ONCS_WRITE_ZEROES); + + /* XXX: don't report vwc if the underlying device is write through */ + id->vwc = NVME_CTRL_VWC_PRESENT; + + /* + * We can't support atomic writes bigger than a LBA without support + * from the backend device. + */ + id->awun = 0; + id->awupf = 0; + + id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */ + if (ctrl->ops->has_keyed_sgls) + id->sgls |= cpu_to_le32(1 << 2); + if (req->port->inline_data_size) + id->sgls |= cpu_to_le32(1 << 20); + + strcpy(id->subnqn, ctrl->subsys->subsysnqn); + + /* Max command capsule size is sqe + single page of in-capsule data */ + id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) + + req->port->inline_data_size) / 16); + /* Max response capsule size is cqe */ + id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16); + + id->msdbd = ctrl->ops->msdbd; + + id->anacap = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4); + id->anatt = 10; /* random value */ + id->anagrpmax = cpu_to_le32(NVMET_MAX_ANAGRPS); + id->nanagrpid = cpu_to_le32(NVMET_MAX_ANAGRPS); + + /* + * Meh, we don't really support any power state. Fake up the same + * values that qemu does. + */ + id->psd[0].max_power = cpu_to_le16(0x9c4); + id->psd[0].entry_lat = cpu_to_le32(0x10); + id->psd[0].exit_lat = cpu_to_le32(0x4); + + id->nwpc = 1 << 0; /* write protect and no write protect */ + + status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id)); + + kfree(id); +out: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_identify_ns(struct nvmet_req *req) +{ + struct nvmet_ns *ns; + struct nvme_id_ns *id; + u16 status = 0; + + if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) { + status = NVME_SC_INVALID_NS | NVME_SC_DNR; + goto out; + } + + id = kzalloc(sizeof(*id), GFP_KERNEL); + if (!id) { + status = NVME_SC_INTERNAL; + goto out; + } + + /* return an all zeroed buffer if we can't find an active namespace */ + ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid); + if (!ns) + goto done; + + /* + * nuse = ncap = nsze isn't always true, but we have no way to find + * that out from the underlying device. + */ + id->ncap = id->nsze = cpu_to_le64(ns->size >> ns->blksize_shift); + switch (req->port->ana_state[ns->anagrpid]) { + case NVME_ANA_INACCESSIBLE: + case NVME_ANA_PERSISTENT_LOSS: + break; + default: + id->nuse = id->nsze; + break; + } + + /* + * We just provide a single LBA format that matches what the + * underlying device reports. + */ + id->nlbaf = 0; + id->flbas = 0; + + /* + * Our namespace might always be shared. Not just with other + * controllers, but also with any other user of the block device. + */ + id->nmic = (1 << 0); + id->anagrpid = cpu_to_le32(ns->anagrpid); + + memcpy(&id->nguid, &ns->nguid, sizeof(id->nguid)); + + id->lbaf[0].ds = ns->blksize_shift; + + if (ns->readonly) + id->nsattr |= (1 << 0); + nvmet_put_namespace(ns); +done: + status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id)); + kfree(id); +out: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_identify_nslist(struct nvmet_req *req) +{ + static const int buf_size = NVME_IDENTIFY_DATA_SIZE; + struct nvmet_ctrl *ctrl = req->sq->ctrl; + struct nvmet_ns *ns; + u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid); + __le32 *list; + u16 status = 0; + int i = 0; + + list = kzalloc(buf_size, GFP_KERNEL); + if (!list) { + status = NVME_SC_INTERNAL; + goto out; + } + + rcu_read_lock(); + list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) { + if (ns->nsid <= min_nsid) + continue; + list[i++] = cpu_to_le32(ns->nsid); + if (i == buf_size / sizeof(__le32)) + break; + } + rcu_read_unlock(); + + status = nvmet_copy_to_sgl(req, 0, list, buf_size); + + kfree(list); +out: + nvmet_req_complete(req, status); +} + +static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len, + void *id, off_t *off) +{ + struct nvme_ns_id_desc desc = { + .nidt = type, + .nidl = len, + }; + u16 status; + + status = nvmet_copy_to_sgl(req, *off, &desc, sizeof(desc)); + if (status) + return status; + *off += sizeof(desc); + + status = nvmet_copy_to_sgl(req, *off, id, len); + if (status) + return status; + *off += len; + + return 0; +} + +static void nvmet_execute_identify_desclist(struct nvmet_req *req) +{ + struct nvmet_ns *ns; + u16 status = 0; + off_t off = 0; + + ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid); + if (!ns) { + status = NVME_SC_INVALID_NS | NVME_SC_DNR; + goto out; + } + + if (memchr_inv(&ns->uuid, 0, sizeof(ns->uuid))) { + status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID, + NVME_NIDT_UUID_LEN, + &ns->uuid, &off); + if (status) + goto out_put_ns; + } + if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) { + status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID, + NVME_NIDT_NGUID_LEN, + &ns->nguid, &off); + if (status) + goto out_put_ns; + } + + if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off, + off) != NVME_IDENTIFY_DATA_SIZE - off) + status = NVME_SC_INTERNAL | NVME_SC_DNR; +out_put_ns: + nvmet_put_namespace(ns); +out: + nvmet_req_complete(req, status); +} + +/* + * A "minimum viable" abort implementation: the command is mandatory in the + * spec, but we are not required to do any useful work. We couldn't really + * do a useful abort, so don't bother even with waiting for the command + * to be exectuted and return immediately telling the command to abort + * wasn't found. + */ +static void nvmet_execute_abort(struct nvmet_req *req) +{ + nvmet_set_result(req, 1); + nvmet_req_complete(req, 0); +} + +static u16 nvmet_write_protect_flush_sync(struct nvmet_req *req) +{ + u16 status; + + if (req->ns->file) + status = nvmet_file_flush(req); + else + status = nvmet_bdev_flush(req); + + if (status) + pr_err("write protect flush failed nsid: %u\n", req->ns->nsid); + return status; +} + +static u16 nvmet_set_feat_write_protect(struct nvmet_req *req) +{ + u32 write_protect = le32_to_cpu(req->cmd->common.cdw10[1]); + struct nvmet_subsys *subsys = req->sq->ctrl->subsys; + u16 status = NVME_SC_FEATURE_NOT_CHANGEABLE; + + req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->rw.nsid); + if (unlikely(!req->ns)) + return status; + + mutex_lock(&subsys->lock); + switch (write_protect) { + case NVME_NS_WRITE_PROTECT: + req->ns->readonly = true; + status = nvmet_write_protect_flush_sync(req); + if (status) + req->ns->readonly = false; + break; + case NVME_NS_NO_WRITE_PROTECT: + req->ns->readonly = false; + status = 0; + break; + default: + break; + } + + if (!status) + nvmet_ns_changed(subsys, req->ns->nsid); + mutex_unlock(&subsys->lock); + return status; +} + +static void nvmet_execute_set_features(struct nvmet_req *req) +{ + struct nvmet_subsys *subsys = req->sq->ctrl->subsys; + u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]); + u32 val32; + u16 status = 0; + + switch (cdw10 & 0xff) { + case NVME_FEAT_NUM_QUEUES: + nvmet_set_result(req, + (subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16)); + break; + case NVME_FEAT_KATO: + val32 = le32_to_cpu(req->cmd->common.cdw10[1]); + req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000); + nvmet_set_result(req, req->sq->ctrl->kato); + break; + case NVME_FEAT_ASYNC_EVENT: + val32 = le32_to_cpu(req->cmd->common.cdw10[1]); + if (val32 & ~NVMET_AEN_CFG_ALL) { + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + + WRITE_ONCE(req->sq->ctrl->aen_enabled, val32); + nvmet_set_result(req, val32); + break; + case NVME_FEAT_HOST_ID: + status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; + break; + case NVME_FEAT_WRITE_PROTECT: + status = nvmet_set_feat_write_protect(req); + break; + default: + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + + nvmet_req_complete(req, status); +} + +static u16 nvmet_get_feat_write_protect(struct nvmet_req *req) +{ + struct nvmet_subsys *subsys = req->sq->ctrl->subsys; + u32 result; + + req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->common.nsid); + if (!req->ns) + return NVME_SC_INVALID_NS | NVME_SC_DNR; + + mutex_lock(&subsys->lock); + if (req->ns->readonly == true) + result = NVME_NS_WRITE_PROTECT; + else + result = NVME_NS_NO_WRITE_PROTECT; + nvmet_set_result(req, result); + mutex_unlock(&subsys->lock); + + return 0; +} + +static void nvmet_execute_get_features(struct nvmet_req *req) +{ + struct nvmet_subsys *subsys = req->sq->ctrl->subsys; + u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]); + u16 status = 0; + + switch (cdw10 & 0xff) { + /* + * These features are mandatory in the spec, but we don't + * have a useful way to implement them. We'll eventually + * need to come up with some fake values for these. + */ +#if 0 + case NVME_FEAT_ARBITRATION: + break; + case NVME_FEAT_POWER_MGMT: + break; + case NVME_FEAT_TEMP_THRESH: + break; + case NVME_FEAT_ERR_RECOVERY: + break; + case NVME_FEAT_IRQ_COALESCE: + break; + case NVME_FEAT_IRQ_CONFIG: + break; + case NVME_FEAT_WRITE_ATOMIC: + break; +#endif + case NVME_FEAT_ASYNC_EVENT: + nvmet_set_result(req, READ_ONCE(req->sq->ctrl->aen_enabled)); + break; + case NVME_FEAT_VOLATILE_WC: + nvmet_set_result(req, 1); + break; + case NVME_FEAT_NUM_QUEUES: + nvmet_set_result(req, + (subsys->max_qid-1) | ((subsys->max_qid-1) << 16)); + break; + case NVME_FEAT_KATO: + nvmet_set_result(req, req->sq->ctrl->kato * 1000); + break; + case NVME_FEAT_HOST_ID: + /* need 128-bit host identifier flag */ + if (!(req->cmd->common.cdw10[1] & cpu_to_le32(1 << 0))) { + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + + status = nvmet_copy_to_sgl(req, 0, &req->sq->ctrl->hostid, + sizeof(req->sq->ctrl->hostid)); + break; + case NVME_FEAT_WRITE_PROTECT: + status = nvmet_get_feat_write_protect(req); + break; + default: + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + + nvmet_req_complete(req, status); +} + +static void nvmet_execute_async_event(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + + mutex_lock(&ctrl->lock); + if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) { + mutex_unlock(&ctrl->lock); + nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR); + return; + } + ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req; + mutex_unlock(&ctrl->lock); + + schedule_work(&ctrl->async_event_work); +} + +static void nvmet_execute_keep_alive(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + + pr_debug("ctrl %d update keep-alive timer for %d secs\n", + ctrl->cntlid, ctrl->kato); + + mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ); + nvmet_req_complete(req, 0); +} + +u16 nvmet_parse_admin_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + u16 ret; + + ret = nvmet_check_ctrl_status(req, cmd); + if (unlikely(ret)) + return ret; + + switch (cmd->common.opcode) { + case nvme_admin_get_log_page: + req->data_len = nvmet_get_log_page_len(cmd); + + switch (cmd->get_log_page.lid) { + case NVME_LOG_ERROR: + /* + * We currently never set the More bit in the status + * field, so all error log entries are invalid and can + * be zeroed out. This is called a minum viable + * implementation (TM) of this mandatory log page. + */ + req->execute = nvmet_execute_get_log_page_noop; + return 0; + case NVME_LOG_SMART: + req->execute = nvmet_execute_get_log_page_smart; + return 0; + case NVME_LOG_FW_SLOT: + /* + * We only support a single firmware slot which always + * is active, so we can zero out the whole firmware slot + * log and still claim to fully implement this mandatory + * log page. + */ + req->execute = nvmet_execute_get_log_page_noop; + return 0; + case NVME_LOG_CHANGED_NS: + req->execute = nvmet_execute_get_log_changed_ns; + return 0; + case NVME_LOG_CMD_EFFECTS: + req->execute = nvmet_execute_get_log_cmd_effects_ns; + return 0; + case NVME_LOG_ANA: + req->execute = nvmet_execute_get_log_page_ana; + return 0; + } + break; + case nvme_admin_identify: + req->data_len = NVME_IDENTIFY_DATA_SIZE; + switch (cmd->identify.cns) { + case NVME_ID_CNS_NS: + req->execute = nvmet_execute_identify_ns; + return 0; + case NVME_ID_CNS_CTRL: + req->execute = nvmet_execute_identify_ctrl; + return 0; + case NVME_ID_CNS_NS_ACTIVE_LIST: + req->execute = nvmet_execute_identify_nslist; + return 0; + case NVME_ID_CNS_NS_DESC_LIST: + req->execute = nvmet_execute_identify_desclist; + return 0; + } + break; + case nvme_admin_abort_cmd: + req->execute = nvmet_execute_abort; + req->data_len = 0; + return 0; + case nvme_admin_set_features: + req->execute = nvmet_execute_set_features; + req->data_len = 0; + return 0; + case nvme_admin_get_features: + req->execute = nvmet_execute_get_features; + req->data_len = 0; + return 0; + case nvme_admin_async_event: + req->execute = nvmet_execute_async_event; + req->data_len = 0; + return 0; + case nvme_admin_keep_alive: + req->execute = nvmet_execute_keep_alive; + req->data_len = 0; + return 0; + } + + pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode, + req->sq->qid); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; +} diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c new file mode 100644 index 000000000..b37a8e3e3 --- /dev/null +++ b/drivers/nvme/target/configfs.c @@ -0,0 +1,1276 @@ +/* + * Configfs interface for the NVMe target. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/ctype.h> + +#include "nvmet.h" + +static const struct config_item_type nvmet_host_type; +static const struct config_item_type nvmet_subsys_type; + +static const struct nvmet_transport_name { + u8 type; + const char *name; +} nvmet_transport_names[] = { + { NVMF_TRTYPE_RDMA, "rdma" }, + { NVMF_TRTYPE_FC, "fc" }, + { NVMF_TRTYPE_LOOP, "loop" }, +}; + +/* + * nvmet_port Generic ConfigFS definitions. + * Used in any place in the ConfigFS tree that refers to an address. + */ +static ssize_t nvmet_addr_adrfam_show(struct config_item *item, + char *page) +{ + switch (to_nvmet_port(item)->disc_addr.adrfam) { + case NVMF_ADDR_FAMILY_IP4: + return sprintf(page, "ipv4\n"); + case NVMF_ADDR_FAMILY_IP6: + return sprintf(page, "ipv6\n"); + case NVMF_ADDR_FAMILY_IB: + return sprintf(page, "ib\n"); + case NVMF_ADDR_FAMILY_FC: + return sprintf(page, "fc\n"); + default: + return sprintf(page, "\n"); + } +} + +static ssize_t nvmet_addr_adrfam_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + + if (port->enabled) { + pr_err("Cannot modify address while enabled\n"); + pr_err("Disable the address before modifying\n"); + return -EACCES; + } + + if (sysfs_streq(page, "ipv4")) { + port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IP4; + } else if (sysfs_streq(page, "ipv6")) { + port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IP6; + } else if (sysfs_streq(page, "ib")) { + port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IB; + } else if (sysfs_streq(page, "fc")) { + port->disc_addr.adrfam = NVMF_ADDR_FAMILY_FC; + } else { + pr_err("Invalid value '%s' for adrfam\n", page); + return -EINVAL; + } + + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_adrfam); + +static ssize_t nvmet_addr_portid_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%d\n", + le16_to_cpu(port->disc_addr.portid)); +} + +static ssize_t nvmet_addr_portid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + u16 portid = 0; + + if (kstrtou16(page, 0, &portid)) { + pr_err("Invalid value '%s' for portid\n", page); + return -EINVAL; + } + + if (port->enabled) { + pr_err("Cannot modify address while enabled\n"); + pr_err("Disable the address before modifying\n"); + return -EACCES; + } + port->disc_addr.portid = cpu_to_le16(portid); + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_portid); + +static ssize_t nvmet_addr_traddr_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%s\n", + port->disc_addr.traddr); +} + +static ssize_t nvmet_addr_traddr_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + + if (count > NVMF_TRADDR_SIZE) { + pr_err("Invalid value '%s' for traddr\n", page); + return -EINVAL; + } + + if (port->enabled) { + pr_err("Cannot modify address while enabled\n"); + pr_err("Disable the address before modifying\n"); + return -EACCES; + } + + if (sscanf(page, "%s\n", port->disc_addr.traddr) != 1) + return -EINVAL; + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_traddr); + +static ssize_t nvmet_addr_treq_show(struct config_item *item, + char *page) +{ + switch (to_nvmet_port(item)->disc_addr.treq) { + case NVMF_TREQ_NOT_SPECIFIED: + return sprintf(page, "not specified\n"); + case NVMF_TREQ_REQUIRED: + return sprintf(page, "required\n"); + case NVMF_TREQ_NOT_REQUIRED: + return sprintf(page, "not required\n"); + default: + return sprintf(page, "\n"); + } +} + +static ssize_t nvmet_addr_treq_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + + if (port->enabled) { + pr_err("Cannot modify address while enabled\n"); + pr_err("Disable the address before modifying\n"); + return -EACCES; + } + + if (sysfs_streq(page, "not specified")) { + port->disc_addr.treq = NVMF_TREQ_NOT_SPECIFIED; + } else if (sysfs_streq(page, "required")) { + port->disc_addr.treq = NVMF_TREQ_REQUIRED; + } else if (sysfs_streq(page, "not required")) { + port->disc_addr.treq = NVMF_TREQ_NOT_REQUIRED; + } else { + pr_err("Invalid value '%s' for treq\n", page); + return -EINVAL; + } + + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_treq); + +static ssize_t nvmet_addr_trsvcid_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%s\n", + port->disc_addr.trsvcid); +} + +static ssize_t nvmet_addr_trsvcid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + + if (count > NVMF_TRSVCID_SIZE) { + pr_err("Invalid value '%s' for trsvcid\n", page); + return -EINVAL; + } + if (port->enabled) { + pr_err("Cannot modify address while enabled\n"); + pr_err("Disable the address before modifying\n"); + return -EACCES; + } + + if (sscanf(page, "%s\n", port->disc_addr.trsvcid) != 1) + return -EINVAL; + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_trsvcid); + +static ssize_t nvmet_param_inline_data_size_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + + return snprintf(page, PAGE_SIZE, "%d\n", port->inline_data_size); +} + +static ssize_t nvmet_param_inline_data_size_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + int ret; + + if (port->enabled) { + pr_err("Cannot modify inline_data_size while port enabled\n"); + pr_err("Disable the port before modifying\n"); + return -EACCES; + } + ret = kstrtoint(page, 0, &port->inline_data_size); + if (ret) { + pr_err("Invalid value '%s' for inline_data_size\n", page); + return -EINVAL; + } + return count; +} + +CONFIGFS_ATTR(nvmet_, param_inline_data_size); + +static ssize_t nvmet_addr_trtype_show(struct config_item *item, + char *page) +{ + struct nvmet_port *port = to_nvmet_port(item); + int i; + + for (i = 0; i < ARRAY_SIZE(nvmet_transport_names); i++) { + if (port->disc_addr.trtype != nvmet_transport_names[i].type) + continue; + return sprintf(page, "%s\n", nvmet_transport_names[i].name); + } + + return sprintf(page, "\n"); +} + +static void nvmet_port_init_tsas_rdma(struct nvmet_port *port) +{ + port->disc_addr.tsas.rdma.qptype = NVMF_RDMA_QPTYPE_CONNECTED; + port->disc_addr.tsas.rdma.prtype = NVMF_RDMA_PRTYPE_NOT_SPECIFIED; + port->disc_addr.tsas.rdma.cms = NVMF_RDMA_CMS_RDMA_CM; +} + +static ssize_t nvmet_addr_trtype_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *port = to_nvmet_port(item); + int i; + + if (port->enabled) { + pr_err("Cannot modify address while enabled\n"); + pr_err("Disable the address before modifying\n"); + return -EACCES; + } + + for (i = 0; i < ARRAY_SIZE(nvmet_transport_names); i++) { + if (sysfs_streq(page, nvmet_transport_names[i].name)) + goto found; + } + + pr_err("Invalid value '%s' for trtype\n", page); + return -EINVAL; +found: + memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE); + port->disc_addr.trtype = nvmet_transport_names[i].type; + if (port->disc_addr.trtype == NVMF_TRTYPE_RDMA) + nvmet_port_init_tsas_rdma(port); + return count; +} + +CONFIGFS_ATTR(nvmet_, addr_trtype); + +/* + * Namespace structures & file operation functions below + */ +static ssize_t nvmet_ns_device_path_show(struct config_item *item, char *page) +{ + return sprintf(page, "%s\n", to_nvmet_ns(item)->device_path); +} + +static ssize_t nvmet_ns_device_path_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + struct nvmet_subsys *subsys = ns->subsys; + size_t len; + int ret; + + mutex_lock(&subsys->lock); + ret = -EBUSY; + if (ns->enabled) + goto out_unlock; + + ret = -EINVAL; + len = strcspn(page, "\n"); + if (!len) + goto out_unlock; + + kfree(ns->device_path); + ret = -ENOMEM; + ns->device_path = kstrndup(page, len, GFP_KERNEL); + if (!ns->device_path) + goto out_unlock; + + mutex_unlock(&subsys->lock); + return count; + +out_unlock: + mutex_unlock(&subsys->lock); + return ret; +} + +CONFIGFS_ATTR(nvmet_ns_, device_path); + +static ssize_t nvmet_ns_device_uuid_show(struct config_item *item, char *page) +{ + return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->uuid); +} + +static ssize_t nvmet_ns_device_uuid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + struct nvmet_subsys *subsys = ns->subsys; + int ret = 0; + + + mutex_lock(&subsys->lock); + if (ns->enabled) { + ret = -EBUSY; + goto out_unlock; + } + + + if (uuid_parse(page, &ns->uuid)) + ret = -EINVAL; + +out_unlock: + mutex_unlock(&subsys->lock); + return ret ? ret : count; +} + +CONFIGFS_ATTR(nvmet_ns_, device_uuid); + +static ssize_t nvmet_ns_device_nguid_show(struct config_item *item, char *page) +{ + return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->nguid); +} + +static ssize_t nvmet_ns_device_nguid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + struct nvmet_subsys *subsys = ns->subsys; + u8 nguid[16]; + const char *p = page; + int i; + int ret = 0; + + mutex_lock(&subsys->lock); + if (ns->enabled) { + ret = -EBUSY; + goto out_unlock; + } + + for (i = 0; i < 16; i++) { + if (p + 2 > page + count) { + ret = -EINVAL; + goto out_unlock; + } + if (!isxdigit(p[0]) || !isxdigit(p[1])) { + ret = -EINVAL; + goto out_unlock; + } + + nguid[i] = (hex_to_bin(p[0]) << 4) | hex_to_bin(p[1]); + p += 2; + + if (*p == '-' || *p == ':') + p++; + } + + memcpy(&ns->nguid, nguid, sizeof(nguid)); +out_unlock: + mutex_unlock(&subsys->lock); + return ret ? ret : count; +} + +CONFIGFS_ATTR(nvmet_ns_, device_nguid); + +static ssize_t nvmet_ns_ana_grpid_show(struct config_item *item, char *page) +{ + return sprintf(page, "%u\n", to_nvmet_ns(item)->anagrpid); +} + +static ssize_t nvmet_ns_ana_grpid_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + u32 oldgrpid, newgrpid; + int ret; + + ret = kstrtou32(page, 0, &newgrpid); + if (ret) + return ret; + + if (newgrpid < 1 || newgrpid > NVMET_MAX_ANAGRPS) + return -EINVAL; + + down_write(&nvmet_ana_sem); + oldgrpid = ns->anagrpid; + nvmet_ana_group_enabled[newgrpid]++; + ns->anagrpid = newgrpid; + nvmet_ana_group_enabled[oldgrpid]--; + nvmet_ana_chgcnt++; + up_write(&nvmet_ana_sem); + + nvmet_send_ana_event(ns->subsys, NULL); + return count; +} + +CONFIGFS_ATTR(nvmet_ns_, ana_grpid); + +static ssize_t nvmet_ns_enable_show(struct config_item *item, char *page) +{ + return sprintf(page, "%d\n", to_nvmet_ns(item)->enabled); +} + +static ssize_t nvmet_ns_enable_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + bool enable; + int ret = 0; + + if (strtobool(page, &enable)) + return -EINVAL; + + if (enable) + ret = nvmet_ns_enable(ns); + else + nvmet_ns_disable(ns); + + return ret ? ret : count; +} + +CONFIGFS_ATTR(nvmet_ns_, enable); + +static ssize_t nvmet_ns_buffered_io_show(struct config_item *item, char *page) +{ + return sprintf(page, "%d\n", to_nvmet_ns(item)->buffered_io); +} + +static ssize_t nvmet_ns_buffered_io_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + bool val; + + if (strtobool(page, &val)) + return -EINVAL; + + mutex_lock(&ns->subsys->lock); + if (ns->enabled) { + pr_err("disable ns before setting buffered_io value.\n"); + mutex_unlock(&ns->subsys->lock); + return -EINVAL; + } + + ns->buffered_io = val; + mutex_unlock(&ns->subsys->lock); + return count; +} + +CONFIGFS_ATTR(nvmet_ns_, buffered_io); + +static struct configfs_attribute *nvmet_ns_attrs[] = { + &nvmet_ns_attr_device_path, + &nvmet_ns_attr_device_nguid, + &nvmet_ns_attr_device_uuid, + &nvmet_ns_attr_ana_grpid, + &nvmet_ns_attr_enable, + &nvmet_ns_attr_buffered_io, + NULL, +}; + +static void nvmet_ns_release(struct config_item *item) +{ + struct nvmet_ns *ns = to_nvmet_ns(item); + + nvmet_ns_free(ns); +} + +static struct configfs_item_operations nvmet_ns_item_ops = { + .release = nvmet_ns_release, +}; + +static const struct config_item_type nvmet_ns_type = { + .ct_item_ops = &nvmet_ns_item_ops, + .ct_attrs = nvmet_ns_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_ns_make(struct config_group *group, + const char *name) +{ + struct nvmet_subsys *subsys = namespaces_to_subsys(&group->cg_item); + struct nvmet_ns *ns; + int ret; + u32 nsid; + + ret = kstrtou32(name, 0, &nsid); + if (ret) + goto out; + + ret = -EINVAL; + if (nsid == 0 || nsid == NVME_NSID_ALL) + goto out; + + ret = -ENOMEM; + ns = nvmet_ns_alloc(subsys, nsid); + if (!ns) + goto out; + config_group_init_type_name(&ns->group, name, &nvmet_ns_type); + + pr_info("adding nsid %d to subsystem %s\n", nsid, subsys->subsysnqn); + + return &ns->group; +out: + return ERR_PTR(ret); +} + +static struct configfs_group_operations nvmet_namespaces_group_ops = { + .make_group = nvmet_ns_make, +}; + +static const struct config_item_type nvmet_namespaces_type = { + .ct_group_ops = &nvmet_namespaces_group_ops, + .ct_owner = THIS_MODULE, +}; + +static int nvmet_port_subsys_allow_link(struct config_item *parent, + struct config_item *target) +{ + struct nvmet_port *port = to_nvmet_port(parent->ci_parent); + struct nvmet_subsys *subsys; + struct nvmet_subsys_link *link, *p; + int ret; + + if (target->ci_type != &nvmet_subsys_type) { + pr_err("can only link subsystems into the subsystems dir.!\n"); + return -EINVAL; + } + subsys = to_subsys(target); + link = kmalloc(sizeof(*link), GFP_KERNEL); + if (!link) + return -ENOMEM; + link->subsys = subsys; + + down_write(&nvmet_config_sem); + ret = -EEXIST; + list_for_each_entry(p, &port->subsystems, entry) { + if (p->subsys == subsys) + goto out_free_link; + } + + if (list_empty(&port->subsystems)) { + ret = nvmet_enable_port(port); + if (ret) + goto out_free_link; + } + + list_add_tail(&link->entry, &port->subsystems); + nvmet_genctr++; + up_write(&nvmet_config_sem); + return 0; + +out_free_link: + up_write(&nvmet_config_sem); + kfree(link); + return ret; +} + +static void nvmet_port_subsys_drop_link(struct config_item *parent, + struct config_item *target) +{ + struct nvmet_port *port = to_nvmet_port(parent->ci_parent); + struct nvmet_subsys *subsys = to_subsys(target); + struct nvmet_subsys_link *p; + + down_write(&nvmet_config_sem); + list_for_each_entry(p, &port->subsystems, entry) { + if (p->subsys == subsys) + goto found; + } + up_write(&nvmet_config_sem); + return; + +found: + list_del(&p->entry); + nvmet_genctr++; + if (list_empty(&port->subsystems)) + nvmet_disable_port(port); + up_write(&nvmet_config_sem); + kfree(p); +} + +static struct configfs_item_operations nvmet_port_subsys_item_ops = { + .allow_link = nvmet_port_subsys_allow_link, + .drop_link = nvmet_port_subsys_drop_link, +}; + +static const struct config_item_type nvmet_port_subsys_type = { + .ct_item_ops = &nvmet_port_subsys_item_ops, + .ct_owner = THIS_MODULE, +}; + +static int nvmet_allowed_hosts_allow_link(struct config_item *parent, + struct config_item *target) +{ + struct nvmet_subsys *subsys = to_subsys(parent->ci_parent); + struct nvmet_host *host; + struct nvmet_host_link *link, *p; + int ret; + + if (target->ci_type != &nvmet_host_type) { + pr_err("can only link hosts into the allowed_hosts directory!\n"); + return -EINVAL; + } + + host = to_host(target); + link = kmalloc(sizeof(*link), GFP_KERNEL); + if (!link) + return -ENOMEM; + link->host = host; + + down_write(&nvmet_config_sem); + ret = -EINVAL; + if (subsys->allow_any_host) { + pr_err("can't add hosts when allow_any_host is set!\n"); + goto out_free_link; + } + + ret = -EEXIST; + list_for_each_entry(p, &subsys->hosts, entry) { + if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host))) + goto out_free_link; + } + list_add_tail(&link->entry, &subsys->hosts); + nvmet_genctr++; + up_write(&nvmet_config_sem); + return 0; +out_free_link: + up_write(&nvmet_config_sem); + kfree(link); + return ret; +} + +static void nvmet_allowed_hosts_drop_link(struct config_item *parent, + struct config_item *target) +{ + struct nvmet_subsys *subsys = to_subsys(parent->ci_parent); + struct nvmet_host *host = to_host(target); + struct nvmet_host_link *p; + + down_write(&nvmet_config_sem); + list_for_each_entry(p, &subsys->hosts, entry) { + if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host))) + goto found; + } + up_write(&nvmet_config_sem); + return; + +found: + list_del(&p->entry); + nvmet_genctr++; + up_write(&nvmet_config_sem); + kfree(p); +} + +static struct configfs_item_operations nvmet_allowed_hosts_item_ops = { + .allow_link = nvmet_allowed_hosts_allow_link, + .drop_link = nvmet_allowed_hosts_drop_link, +}; + +static const struct config_item_type nvmet_allowed_hosts_type = { + .ct_item_ops = &nvmet_allowed_hosts_item_ops, + .ct_owner = THIS_MODULE, +}; + +static ssize_t nvmet_subsys_attr_allow_any_host_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%d\n", + to_subsys(item)->allow_any_host); +} + +static ssize_t nvmet_subsys_attr_allow_any_host_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item); + bool allow_any_host; + int ret = 0; + + if (strtobool(page, &allow_any_host)) + return -EINVAL; + + down_write(&nvmet_config_sem); + if (allow_any_host && !list_empty(&subsys->hosts)) { + pr_err("Can't set allow_any_host when explicit hosts are set!\n"); + ret = -EINVAL; + goto out_unlock; + } + + subsys->allow_any_host = allow_any_host; +out_unlock: + up_write(&nvmet_config_sem); + return ret ? ret : count; +} + +CONFIGFS_ATTR(nvmet_subsys_, attr_allow_any_host); + +static ssize_t nvmet_subsys_attr_version_show(struct config_item *item, + char *page) +{ + struct nvmet_subsys *subsys = to_subsys(item); + + if (NVME_TERTIARY(subsys->ver)) + return snprintf(page, PAGE_SIZE, "%d.%d.%d\n", + (int)NVME_MAJOR(subsys->ver), + (int)NVME_MINOR(subsys->ver), + (int)NVME_TERTIARY(subsys->ver)); + else + return snprintf(page, PAGE_SIZE, "%d.%d\n", + (int)NVME_MAJOR(subsys->ver), + (int)NVME_MINOR(subsys->ver)); +} + +static ssize_t nvmet_subsys_attr_version_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item); + int major, minor, tertiary = 0; + int ret; + + + ret = sscanf(page, "%d.%d.%d\n", &major, &minor, &tertiary); + if (ret != 2 && ret != 3) + return -EINVAL; + + down_write(&nvmet_config_sem); + subsys->ver = NVME_VS(major, minor, tertiary); + up_write(&nvmet_config_sem); + + return count; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_version); + +static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item, + char *page) +{ + struct nvmet_subsys *subsys = to_subsys(item); + + return snprintf(page, PAGE_SIZE, "%llx\n", subsys->serial); +} + +static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item); + + down_write(&nvmet_config_sem); + sscanf(page, "%llx\n", &subsys->serial); + up_write(&nvmet_config_sem); + + return count; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_serial); + +static struct configfs_attribute *nvmet_subsys_attrs[] = { + &nvmet_subsys_attr_attr_allow_any_host, + &nvmet_subsys_attr_attr_version, + &nvmet_subsys_attr_attr_serial, + NULL, +}; + +/* + * Subsystem structures & folder operation functions below + */ +static void nvmet_subsys_release(struct config_item *item) +{ + struct nvmet_subsys *subsys = to_subsys(item); + + nvmet_subsys_del_ctrls(subsys); + nvmet_subsys_put(subsys); +} + +static struct configfs_item_operations nvmet_subsys_item_ops = { + .release = nvmet_subsys_release, +}; + +static const struct config_item_type nvmet_subsys_type = { + .ct_item_ops = &nvmet_subsys_item_ops, + .ct_attrs = nvmet_subsys_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_subsys_make(struct config_group *group, + const char *name) +{ + struct nvmet_subsys *subsys; + + if (sysfs_streq(name, NVME_DISC_SUBSYS_NAME)) { + pr_err("can't create discovery subsystem through configfs\n"); + return ERR_PTR(-EINVAL); + } + + subsys = nvmet_subsys_alloc(name, NVME_NQN_NVME); + if (!subsys) + return ERR_PTR(-ENOMEM); + + config_group_init_type_name(&subsys->group, name, &nvmet_subsys_type); + + config_group_init_type_name(&subsys->namespaces_group, + "namespaces", &nvmet_namespaces_type); + configfs_add_default_group(&subsys->namespaces_group, &subsys->group); + + config_group_init_type_name(&subsys->allowed_hosts_group, + "allowed_hosts", &nvmet_allowed_hosts_type); + configfs_add_default_group(&subsys->allowed_hosts_group, + &subsys->group); + + return &subsys->group; +} + +static struct configfs_group_operations nvmet_subsystems_group_ops = { + .make_group = nvmet_subsys_make, +}; + +static const struct config_item_type nvmet_subsystems_type = { + .ct_group_ops = &nvmet_subsystems_group_ops, + .ct_owner = THIS_MODULE, +}; + +static ssize_t nvmet_referral_enable_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%d\n", to_nvmet_port(item)->enabled); +} + +static ssize_t nvmet_referral_enable_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent); + struct nvmet_port *port = to_nvmet_port(item); + bool enable; + + if (strtobool(page, &enable)) + goto inval; + + if (enable) + nvmet_referral_enable(parent, port); + else + nvmet_referral_disable(port); + + return count; +inval: + pr_err("Invalid value '%s' for enable\n", page); + return -EINVAL; +} + +CONFIGFS_ATTR(nvmet_referral_, enable); + +/* + * Discovery Service subsystem definitions + */ +static struct configfs_attribute *nvmet_referral_attrs[] = { + &nvmet_attr_addr_adrfam, + &nvmet_attr_addr_portid, + &nvmet_attr_addr_treq, + &nvmet_attr_addr_traddr, + &nvmet_attr_addr_trsvcid, + &nvmet_attr_addr_trtype, + &nvmet_referral_attr_enable, + NULL, +}; + +static void nvmet_referral_release(struct config_item *item) +{ + struct nvmet_port *port = to_nvmet_port(item); + + nvmet_referral_disable(port); + kfree(port); +} + +static struct configfs_item_operations nvmet_referral_item_ops = { + .release = nvmet_referral_release, +}; + +static const struct config_item_type nvmet_referral_type = { + .ct_owner = THIS_MODULE, + .ct_attrs = nvmet_referral_attrs, + .ct_item_ops = &nvmet_referral_item_ops, +}; + +static struct config_group *nvmet_referral_make( + struct config_group *group, const char *name) +{ + struct nvmet_port *port; + + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!port) + return ERR_PTR(-ENOMEM); + + INIT_LIST_HEAD(&port->entry); + config_group_init_type_name(&port->group, name, &nvmet_referral_type); + + return &port->group; +} + +static struct configfs_group_operations nvmet_referral_group_ops = { + .make_group = nvmet_referral_make, +}; + +static const struct config_item_type nvmet_referrals_type = { + .ct_owner = THIS_MODULE, + .ct_group_ops = &nvmet_referral_group_ops, +}; + +static struct { + enum nvme_ana_state state; + const char *name; +} nvmet_ana_state_names[] = { + { NVME_ANA_OPTIMIZED, "optimized" }, + { NVME_ANA_NONOPTIMIZED, "non-optimized" }, + { NVME_ANA_INACCESSIBLE, "inaccessible" }, + { NVME_ANA_PERSISTENT_LOSS, "persistent-loss" }, + { NVME_ANA_CHANGE, "change" }, +}; + +static ssize_t nvmet_ana_group_ana_state_show(struct config_item *item, + char *page) +{ + struct nvmet_ana_group *grp = to_ana_group(item); + enum nvme_ana_state state = grp->port->ana_state[grp->grpid]; + int i; + + for (i = 0; i < ARRAY_SIZE(nvmet_ana_state_names); i++) { + if (state != nvmet_ana_state_names[i].state) + continue; + return sprintf(page, "%s\n", nvmet_ana_state_names[i].name); + } + + return sprintf(page, "\n"); +} + +static ssize_t nvmet_ana_group_ana_state_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_ana_group *grp = to_ana_group(item); + int i; + + for (i = 0; i < ARRAY_SIZE(nvmet_ana_state_names); i++) { + if (sysfs_streq(page, nvmet_ana_state_names[i].name)) + goto found; + } + + pr_err("Invalid value '%s' for ana_state\n", page); + return -EINVAL; + +found: + down_write(&nvmet_ana_sem); + grp->port->ana_state[grp->grpid] = nvmet_ana_state_names[i].state; + nvmet_ana_chgcnt++; + up_write(&nvmet_ana_sem); + + nvmet_port_send_ana_event(grp->port); + return count; +} + +CONFIGFS_ATTR(nvmet_ana_group_, ana_state); + +static struct configfs_attribute *nvmet_ana_group_attrs[] = { + &nvmet_ana_group_attr_ana_state, + NULL, +}; + +static void nvmet_ana_group_release(struct config_item *item) +{ + struct nvmet_ana_group *grp = to_ana_group(item); + + if (grp == &grp->port->ana_default_group) + return; + + down_write(&nvmet_ana_sem); + grp->port->ana_state[grp->grpid] = NVME_ANA_INACCESSIBLE; + nvmet_ana_group_enabled[grp->grpid]--; + up_write(&nvmet_ana_sem); + + nvmet_port_send_ana_event(grp->port); + kfree(grp); +} + +static struct configfs_item_operations nvmet_ana_group_item_ops = { + .release = nvmet_ana_group_release, +}; + +static const struct config_item_type nvmet_ana_group_type = { + .ct_item_ops = &nvmet_ana_group_item_ops, + .ct_attrs = nvmet_ana_group_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_ana_groups_make_group( + struct config_group *group, const char *name) +{ + struct nvmet_port *port = ana_groups_to_port(&group->cg_item); + struct nvmet_ana_group *grp; + u32 grpid; + int ret; + + ret = kstrtou32(name, 0, &grpid); + if (ret) + goto out; + + ret = -EINVAL; + if (grpid <= 1 || grpid > NVMET_MAX_ANAGRPS) + goto out; + + ret = -ENOMEM; + grp = kzalloc(sizeof(*grp), GFP_KERNEL); + if (!grp) + goto out; + grp->port = port; + grp->grpid = grpid; + + down_write(&nvmet_ana_sem); + nvmet_ana_group_enabled[grpid]++; + up_write(&nvmet_ana_sem); + + nvmet_port_send_ana_event(grp->port); + + config_group_init_type_name(&grp->group, name, &nvmet_ana_group_type); + return &grp->group; +out: + return ERR_PTR(ret); +} + +static struct configfs_group_operations nvmet_ana_groups_group_ops = { + .make_group = nvmet_ana_groups_make_group, +}; + +static const struct config_item_type nvmet_ana_groups_type = { + .ct_group_ops = &nvmet_ana_groups_group_ops, + .ct_owner = THIS_MODULE, +}; + +/* + * Ports definitions. + */ +static void nvmet_port_release(struct config_item *item) +{ + struct nvmet_port *port = to_nvmet_port(item); + + kfree(port->ana_state); + kfree(port); +} + +static struct configfs_attribute *nvmet_port_attrs[] = { + &nvmet_attr_addr_adrfam, + &nvmet_attr_addr_treq, + &nvmet_attr_addr_traddr, + &nvmet_attr_addr_trsvcid, + &nvmet_attr_addr_trtype, + &nvmet_attr_param_inline_data_size, + NULL, +}; + +static struct configfs_item_operations nvmet_port_item_ops = { + .release = nvmet_port_release, +}; + +static const struct config_item_type nvmet_port_type = { + .ct_attrs = nvmet_port_attrs, + .ct_item_ops = &nvmet_port_item_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_ports_make(struct config_group *group, + const char *name) +{ + struct nvmet_port *port; + u16 portid; + u32 i; + + if (kstrtou16(name, 0, &portid)) + return ERR_PTR(-EINVAL); + + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!port) + return ERR_PTR(-ENOMEM); + + port->ana_state = kcalloc(NVMET_MAX_ANAGRPS + 1, + sizeof(*port->ana_state), GFP_KERNEL); + if (!port->ana_state) { + kfree(port); + return ERR_PTR(-ENOMEM); + } + + for (i = 1; i <= NVMET_MAX_ANAGRPS; i++) { + if (i == NVMET_DEFAULT_ANA_GRPID) + port->ana_state[1] = NVME_ANA_OPTIMIZED; + else + port->ana_state[i] = NVME_ANA_INACCESSIBLE; + } + + INIT_LIST_HEAD(&port->entry); + INIT_LIST_HEAD(&port->subsystems); + INIT_LIST_HEAD(&port->referrals); + port->inline_data_size = -1; /* < 0 == let the transport choose */ + + port->disc_addr.portid = cpu_to_le16(portid); + config_group_init_type_name(&port->group, name, &nvmet_port_type); + + config_group_init_type_name(&port->subsys_group, + "subsystems", &nvmet_port_subsys_type); + configfs_add_default_group(&port->subsys_group, &port->group); + + config_group_init_type_name(&port->referrals_group, + "referrals", &nvmet_referrals_type); + configfs_add_default_group(&port->referrals_group, &port->group); + + config_group_init_type_name(&port->ana_groups_group, + "ana_groups", &nvmet_ana_groups_type); + configfs_add_default_group(&port->ana_groups_group, &port->group); + + port->ana_default_group.port = port; + port->ana_default_group.grpid = NVMET_DEFAULT_ANA_GRPID; + config_group_init_type_name(&port->ana_default_group.group, + __stringify(NVMET_DEFAULT_ANA_GRPID), + &nvmet_ana_group_type); + configfs_add_default_group(&port->ana_default_group.group, + &port->ana_groups_group); + + return &port->group; +} + +static struct configfs_group_operations nvmet_ports_group_ops = { + .make_group = nvmet_ports_make, +}; + +static const struct config_item_type nvmet_ports_type = { + .ct_group_ops = &nvmet_ports_group_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group nvmet_subsystems_group; +static struct config_group nvmet_ports_group; + +static void nvmet_host_release(struct config_item *item) +{ + struct nvmet_host *host = to_host(item); + + kfree(host); +} + +static struct configfs_item_operations nvmet_host_item_ops = { + .release = nvmet_host_release, +}; + +static const struct config_item_type nvmet_host_type = { + .ct_item_ops = &nvmet_host_item_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *nvmet_hosts_make_group(struct config_group *group, + const char *name) +{ + struct nvmet_host *host; + + host = kzalloc(sizeof(*host), GFP_KERNEL); + if (!host) + return ERR_PTR(-ENOMEM); + + config_group_init_type_name(&host->group, name, &nvmet_host_type); + + return &host->group; +} + +static struct configfs_group_operations nvmet_hosts_group_ops = { + .make_group = nvmet_hosts_make_group, +}; + +static const struct config_item_type nvmet_hosts_type = { + .ct_group_ops = &nvmet_hosts_group_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group nvmet_hosts_group; + +static const struct config_item_type nvmet_root_type = { + .ct_owner = THIS_MODULE, +}; + +static struct configfs_subsystem nvmet_configfs_subsystem = { + .su_group = { + .cg_item = { + .ci_namebuf = "nvmet", + .ci_type = &nvmet_root_type, + }, + }, +}; + +int __init nvmet_init_configfs(void) +{ + int ret; + + config_group_init(&nvmet_configfs_subsystem.su_group); + mutex_init(&nvmet_configfs_subsystem.su_mutex); + + config_group_init_type_name(&nvmet_subsystems_group, + "subsystems", &nvmet_subsystems_type); + configfs_add_default_group(&nvmet_subsystems_group, + &nvmet_configfs_subsystem.su_group); + + config_group_init_type_name(&nvmet_ports_group, + "ports", &nvmet_ports_type); + configfs_add_default_group(&nvmet_ports_group, + &nvmet_configfs_subsystem.su_group); + + config_group_init_type_name(&nvmet_hosts_group, + "hosts", &nvmet_hosts_type); + configfs_add_default_group(&nvmet_hosts_group, + &nvmet_configfs_subsystem.su_group); + + ret = configfs_register_subsystem(&nvmet_configfs_subsystem); + if (ret) { + pr_err("configfs_register_subsystem: %d\n", ret); + return ret; + } + + return 0; +} + +void __exit nvmet_exit_configfs(void) +{ + configfs_unregister_subsystem(&nvmet_configfs_subsystem); +} diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c new file mode 100644 index 000000000..1a35d73c3 --- /dev/null +++ b/drivers/nvme/target/core.c @@ -0,0 +1,1260 @@ +/* + * Common code for the NVMe target. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/module.h> +#include <linux/random.h> +#include <linux/rculist.h> + +#include "nvmet.h" + +struct workqueue_struct *buffered_io_wq; +static const struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX]; +static DEFINE_IDA(cntlid_ida); + +/* + * This read/write semaphore is used to synchronize access to configuration + * information on a target system that will result in discovery log page + * information change for at least one host. + * The full list of resources to protected by this semaphore is: + * + * - subsystems list + * - per-subsystem allowed hosts list + * - allow_any_host subsystem attribute + * - nvmet_genctr + * - the nvmet_transports array + * + * When updating any of those lists/structures write lock should be obtained, + * while when reading (popolating discovery log page or checking host-subsystem + * link) read lock is obtained to allow concurrent reads. + */ +DECLARE_RWSEM(nvmet_config_sem); + +u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1]; +u64 nvmet_ana_chgcnt; +DECLARE_RWSEM(nvmet_ana_sem); + +static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port, + const char *subsysnqn); + +u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf, + size_t len) +{ + if (sg_pcopy_from_buffer(req->sg, req->sg_cnt, buf, len, off) != len) + return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR; + return 0; +} + +u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len) +{ + if (sg_pcopy_to_buffer(req->sg, req->sg_cnt, buf, len, off) != len) + return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR; + return 0; +} + +u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len) +{ + if (sg_zero_buffer(req->sg, req->sg_cnt, len, off) != len) + return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR; + return 0; +} + +static unsigned int nvmet_max_nsid(struct nvmet_subsys *subsys) +{ + struct nvmet_ns *ns; + + if (list_empty(&subsys->namespaces)) + return 0; + + ns = list_last_entry(&subsys->namespaces, struct nvmet_ns, dev_link); + return ns->nsid; +} + +static u32 nvmet_async_event_result(struct nvmet_async_event *aen) +{ + return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16); +} + +static void nvmet_async_events_free(struct nvmet_ctrl *ctrl) +{ + struct nvmet_req *req; + + while (1) { + mutex_lock(&ctrl->lock); + if (!ctrl->nr_async_event_cmds) { + mutex_unlock(&ctrl->lock); + return; + } + + req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds]; + mutex_unlock(&ctrl->lock); + nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR); + } +} + +static void nvmet_async_event_work(struct work_struct *work) +{ + struct nvmet_ctrl *ctrl = + container_of(work, struct nvmet_ctrl, async_event_work); + struct nvmet_async_event *aen; + struct nvmet_req *req; + + while (1) { + mutex_lock(&ctrl->lock); + aen = list_first_entry_or_null(&ctrl->async_events, + struct nvmet_async_event, entry); + if (!aen || !ctrl->nr_async_event_cmds) { + mutex_unlock(&ctrl->lock); + return; + } + + req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds]; + nvmet_set_result(req, nvmet_async_event_result(aen)); + + list_del(&aen->entry); + kfree(aen); + + mutex_unlock(&ctrl->lock); + nvmet_req_complete(req, 0); + } +} + +static void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type, + u8 event_info, u8 log_page) +{ + struct nvmet_async_event *aen; + + aen = kmalloc(sizeof(*aen), GFP_KERNEL); + if (!aen) + return; + + aen->event_type = event_type; + aen->event_info = event_info; + aen->log_page = log_page; + + mutex_lock(&ctrl->lock); + list_add_tail(&aen->entry, &ctrl->async_events); + mutex_unlock(&ctrl->lock); + + schedule_work(&ctrl->async_event_work); +} + +static bool nvmet_aen_disabled(struct nvmet_ctrl *ctrl, u32 aen) +{ + if (!(READ_ONCE(ctrl->aen_enabled) & aen)) + return true; + return test_and_set_bit(aen, &ctrl->aen_masked); +} + +static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid) +{ + u32 i; + + mutex_lock(&ctrl->lock); + if (ctrl->nr_changed_ns > NVME_MAX_CHANGED_NAMESPACES) + goto out_unlock; + + for (i = 0; i < ctrl->nr_changed_ns; i++) { + if (ctrl->changed_ns_list[i] == nsid) + goto out_unlock; + } + + if (ctrl->nr_changed_ns == NVME_MAX_CHANGED_NAMESPACES) { + ctrl->changed_ns_list[0] = cpu_to_le32(0xffffffff); + ctrl->nr_changed_ns = U32_MAX; + goto out_unlock; + } + + ctrl->changed_ns_list[ctrl->nr_changed_ns++] = nsid; +out_unlock: + mutex_unlock(&ctrl->lock); +} + +void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid) +{ + struct nvmet_ctrl *ctrl; + + list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { + nvmet_add_to_changed_ns_log(ctrl, cpu_to_le32(nsid)); + if (nvmet_aen_disabled(ctrl, NVME_AEN_CFG_NS_ATTR)) + continue; + nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, + NVME_AER_NOTICE_NS_CHANGED, + NVME_LOG_CHANGED_NS); + } +} + +void nvmet_send_ana_event(struct nvmet_subsys *subsys, + struct nvmet_port *port) +{ + struct nvmet_ctrl *ctrl; + + mutex_lock(&subsys->lock); + list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { + if (port && ctrl->port != port) + continue; + if (nvmet_aen_disabled(ctrl, NVME_AEN_CFG_ANA_CHANGE)) + continue; + nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, + NVME_AER_NOTICE_ANA, NVME_LOG_ANA); + } + mutex_unlock(&subsys->lock); +} + +void nvmet_port_send_ana_event(struct nvmet_port *port) +{ + struct nvmet_subsys_link *p; + + down_read(&nvmet_config_sem); + list_for_each_entry(p, &port->subsystems, entry) + nvmet_send_ana_event(p->subsys, port); + up_read(&nvmet_config_sem); +} + +int nvmet_register_transport(const struct nvmet_fabrics_ops *ops) +{ + int ret = 0; + + down_write(&nvmet_config_sem); + if (nvmet_transports[ops->type]) + ret = -EINVAL; + else + nvmet_transports[ops->type] = ops; + up_write(&nvmet_config_sem); + + return ret; +} +EXPORT_SYMBOL_GPL(nvmet_register_transport); + +void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops) +{ + down_write(&nvmet_config_sem); + nvmet_transports[ops->type] = NULL; + up_write(&nvmet_config_sem); +} +EXPORT_SYMBOL_GPL(nvmet_unregister_transport); + +int nvmet_enable_port(struct nvmet_port *port) +{ + const struct nvmet_fabrics_ops *ops; + int ret; + + lockdep_assert_held(&nvmet_config_sem); + + ops = nvmet_transports[port->disc_addr.trtype]; + if (!ops) { + up_write(&nvmet_config_sem); + request_module("nvmet-transport-%d", port->disc_addr.trtype); + down_write(&nvmet_config_sem); + ops = nvmet_transports[port->disc_addr.trtype]; + if (!ops) { + pr_err("transport type %d not supported\n", + port->disc_addr.trtype); + return -EINVAL; + } + } + + if (!try_module_get(ops->owner)) + return -EINVAL; + + ret = ops->add_port(port); + if (ret) { + module_put(ops->owner); + return ret; + } + + /* If the transport didn't set inline_data_size, then disable it. */ + if (port->inline_data_size < 0) + port->inline_data_size = 0; + + port->enabled = true; + return 0; +} + +void nvmet_disable_port(struct nvmet_port *port) +{ + const struct nvmet_fabrics_ops *ops; + + lockdep_assert_held(&nvmet_config_sem); + + port->enabled = false; + + ops = nvmet_transports[port->disc_addr.trtype]; + ops->remove_port(port); + module_put(ops->owner); +} + +static void nvmet_keep_alive_timer(struct work_struct *work) +{ + struct nvmet_ctrl *ctrl = container_of(to_delayed_work(work), + struct nvmet_ctrl, ka_work); + + pr_err("ctrl %d keep-alive timer (%d seconds) expired!\n", + ctrl->cntlid, ctrl->kato); + + nvmet_ctrl_fatal_error(ctrl); +} + +static void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl) +{ + if (unlikely(ctrl->kato == 0)) + return; + + pr_debug("ctrl %d start keep-alive timer for %d secs\n", + ctrl->cntlid, ctrl->kato); + + INIT_DELAYED_WORK(&ctrl->ka_work, nvmet_keep_alive_timer); + schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); +} + +static void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl) +{ + if (unlikely(ctrl->kato == 0)) + return; + + pr_debug("ctrl %d stop keep-alive\n", ctrl->cntlid); + + cancel_delayed_work_sync(&ctrl->ka_work); +} + +static struct nvmet_ns *__nvmet_find_namespace(struct nvmet_ctrl *ctrl, + __le32 nsid) +{ + struct nvmet_ns *ns; + + list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) { + if (ns->nsid == le32_to_cpu(nsid)) + return ns; + } + + return NULL; +} + +struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid) +{ + struct nvmet_ns *ns; + + rcu_read_lock(); + ns = __nvmet_find_namespace(ctrl, nsid); + if (ns) + percpu_ref_get(&ns->ref); + rcu_read_unlock(); + + return ns; +} + +static void nvmet_destroy_namespace(struct percpu_ref *ref) +{ + struct nvmet_ns *ns = container_of(ref, struct nvmet_ns, ref); + + complete(&ns->disable_done); +} + +void nvmet_put_namespace(struct nvmet_ns *ns) +{ + percpu_ref_put(&ns->ref); +} + +static void nvmet_ns_dev_disable(struct nvmet_ns *ns) +{ + nvmet_bdev_ns_disable(ns); + nvmet_file_ns_disable(ns); +} + +int nvmet_ns_enable(struct nvmet_ns *ns) +{ + struct nvmet_subsys *subsys = ns->subsys; + int ret; + + mutex_lock(&subsys->lock); + ret = -EMFILE; + if (subsys->nr_namespaces == NVMET_MAX_NAMESPACES) + goto out_unlock; + ret = 0; + if (ns->enabled) + goto out_unlock; + + ret = nvmet_bdev_ns_enable(ns); + if (ret == -ENOTBLK) + ret = nvmet_file_ns_enable(ns); + if (ret) + goto out_unlock; + + ret = percpu_ref_init(&ns->ref, nvmet_destroy_namespace, + 0, GFP_KERNEL); + if (ret) + goto out_dev_put; + + if (ns->nsid > subsys->max_nsid) + subsys->max_nsid = ns->nsid; + + /* + * The namespaces list needs to be sorted to simplify the implementation + * of the Identify Namepace List subcommand. + */ + if (list_empty(&subsys->namespaces)) { + list_add_tail_rcu(&ns->dev_link, &subsys->namespaces); + } else { + struct nvmet_ns *old; + + list_for_each_entry_rcu(old, &subsys->namespaces, dev_link) { + BUG_ON(ns->nsid == old->nsid); + if (ns->nsid < old->nsid) + break; + } + + list_add_tail_rcu(&ns->dev_link, &old->dev_link); + } + subsys->nr_namespaces++; + + nvmet_ns_changed(subsys, ns->nsid); + ns->enabled = true; + ret = 0; +out_unlock: + mutex_unlock(&subsys->lock); + return ret; +out_dev_put: + nvmet_ns_dev_disable(ns); + goto out_unlock; +} + +void nvmet_ns_disable(struct nvmet_ns *ns) +{ + struct nvmet_subsys *subsys = ns->subsys; + + mutex_lock(&subsys->lock); + if (!ns->enabled) + goto out_unlock; + + ns->enabled = false; + list_del_rcu(&ns->dev_link); + if (ns->nsid == subsys->max_nsid) + subsys->max_nsid = nvmet_max_nsid(subsys); + mutex_unlock(&subsys->lock); + + /* + * Now that we removed the namespaces from the lookup list, we + * can kill the per_cpu ref and wait for any remaining references + * to be dropped, as well as a RCU grace period for anyone only + * using the namepace under rcu_read_lock(). Note that we can't + * use call_rcu here as we need to ensure the namespaces have + * been fully destroyed before unloading the module. + */ + percpu_ref_kill(&ns->ref); + synchronize_rcu(); + wait_for_completion(&ns->disable_done); + percpu_ref_exit(&ns->ref); + + mutex_lock(&subsys->lock); + subsys->nr_namespaces--; + nvmet_ns_changed(subsys, ns->nsid); + nvmet_ns_dev_disable(ns); +out_unlock: + mutex_unlock(&subsys->lock); +} + +void nvmet_ns_free(struct nvmet_ns *ns) +{ + nvmet_ns_disable(ns); + + down_write(&nvmet_ana_sem); + nvmet_ana_group_enabled[ns->anagrpid]--; + up_write(&nvmet_ana_sem); + + kfree(ns->device_path); + kfree(ns); +} + +struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid) +{ + struct nvmet_ns *ns; + + ns = kzalloc(sizeof(*ns), GFP_KERNEL); + if (!ns) + return NULL; + + INIT_LIST_HEAD(&ns->dev_link); + init_completion(&ns->disable_done); + + ns->nsid = nsid; + ns->subsys = subsys; + + down_write(&nvmet_ana_sem); + ns->anagrpid = NVMET_DEFAULT_ANA_GRPID; + nvmet_ana_group_enabled[ns->anagrpid]++; + up_write(&nvmet_ana_sem); + + uuid_gen(&ns->uuid); + ns->buffered_io = false; + + return ns; +} + +static void __nvmet_req_complete(struct nvmet_req *req, u16 status) +{ + u32 old_sqhd, new_sqhd; + u16 sqhd; + + if (status) + nvmet_set_status(req, status); + + if (req->sq->size) { + do { + old_sqhd = req->sq->sqhd; + new_sqhd = (old_sqhd + 1) % req->sq->size; + } while (cmpxchg(&req->sq->sqhd, old_sqhd, new_sqhd) != + old_sqhd); + } + sqhd = req->sq->sqhd & 0x0000FFFF; + req->rsp->sq_head = cpu_to_le16(sqhd); + req->rsp->sq_id = cpu_to_le16(req->sq->qid); + req->rsp->command_id = req->cmd->common.command_id; + + if (req->ns) + nvmet_put_namespace(req->ns); + req->ops->queue_response(req); +} + +void nvmet_req_complete(struct nvmet_req *req, u16 status) +{ + __nvmet_req_complete(req, status); + percpu_ref_put(&req->sq->ref); +} +EXPORT_SYMBOL_GPL(nvmet_req_complete); + +void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, + u16 qid, u16 size) +{ + cq->qid = qid; + cq->size = size; + + ctrl->cqs[qid] = cq; +} + +void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, + u16 qid, u16 size) +{ + sq->sqhd = 0; + sq->qid = qid; + sq->size = size; + + ctrl->sqs[qid] = sq; +} + +static void nvmet_confirm_sq(struct percpu_ref *ref) +{ + struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref); + + complete(&sq->confirm_done); +} + +void nvmet_sq_destroy(struct nvmet_sq *sq) +{ + /* + * If this is the admin queue, complete all AERs so that our + * queue doesn't have outstanding requests on it. + */ + if (sq->ctrl && sq->ctrl->sqs && sq->ctrl->sqs[0] == sq) + nvmet_async_events_free(sq->ctrl); + percpu_ref_kill_and_confirm(&sq->ref, nvmet_confirm_sq); + wait_for_completion(&sq->confirm_done); + wait_for_completion(&sq->free_done); + percpu_ref_exit(&sq->ref); + + if (sq->ctrl) { + nvmet_ctrl_put(sq->ctrl); + sq->ctrl = NULL; /* allows reusing the queue later */ + } +} +EXPORT_SYMBOL_GPL(nvmet_sq_destroy); + +static void nvmet_sq_free(struct percpu_ref *ref) +{ + struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref); + + complete(&sq->free_done); +} + +int nvmet_sq_init(struct nvmet_sq *sq) +{ + int ret; + + ret = percpu_ref_init(&sq->ref, nvmet_sq_free, 0, GFP_KERNEL); + if (ret) { + pr_err("percpu_ref init failed!\n"); + return ret; + } + init_completion(&sq->free_done); + init_completion(&sq->confirm_done); + + return 0; +} +EXPORT_SYMBOL_GPL(nvmet_sq_init); + +static inline u16 nvmet_check_ana_state(struct nvmet_port *port, + struct nvmet_ns *ns) +{ + enum nvme_ana_state state = port->ana_state[ns->anagrpid]; + + if (unlikely(state == NVME_ANA_INACCESSIBLE)) + return NVME_SC_ANA_INACCESSIBLE; + if (unlikely(state == NVME_ANA_PERSISTENT_LOSS)) + return NVME_SC_ANA_PERSISTENT_LOSS; + if (unlikely(state == NVME_ANA_CHANGE)) + return NVME_SC_ANA_TRANSITION; + return 0; +} + +static inline u16 nvmet_io_cmd_check_access(struct nvmet_req *req) +{ + if (unlikely(req->ns->readonly)) { + switch (req->cmd->common.opcode) { + case nvme_cmd_read: + case nvme_cmd_flush: + break; + default: + return NVME_SC_NS_WRITE_PROTECTED; + } + } + + return 0; +} + +static u16 nvmet_parse_io_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + u16 ret; + + ret = nvmet_check_ctrl_status(req, cmd); + if (unlikely(ret)) + return ret; + + req->ns = nvmet_find_namespace(req->sq->ctrl, cmd->rw.nsid); + if (unlikely(!req->ns)) + return NVME_SC_INVALID_NS | NVME_SC_DNR; + ret = nvmet_check_ana_state(req->port, req->ns); + if (unlikely(ret)) + return ret; + ret = nvmet_io_cmd_check_access(req); + if (unlikely(ret)) + return ret; + + if (req->ns->file) + return nvmet_file_parse_io_cmd(req); + else + return nvmet_bdev_parse_io_cmd(req); +} + +bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, + struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops) +{ + u8 flags = req->cmd->common.flags; + u16 status; + + req->cq = cq; + req->sq = sq; + req->ops = ops; + req->sg = NULL; + req->sg_cnt = 0; + req->transfer_len = 0; + req->rsp->status = 0; + req->ns = NULL; + + /* no support for fused commands yet */ + if (unlikely(flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND))) { + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + goto fail; + } + + /* + * For fabrics, PSDT field shall describe metadata pointer (MPTR) that + * contains an address of a single contiguous physical buffer that is + * byte aligned. + */ + if (unlikely((flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METABUF)) { + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + goto fail; + } + + if (unlikely(!req->sq->ctrl)) + /* will return an error for any Non-connect command: */ + status = nvmet_parse_connect_cmd(req); + else if (likely(req->sq->qid != 0)) + status = nvmet_parse_io_cmd(req); + else if (req->cmd->common.opcode == nvme_fabrics_command) + status = nvmet_parse_fabrics_cmd(req); + else if (req->sq->ctrl->subsys->type == NVME_NQN_DISC) + status = nvmet_parse_discovery_cmd(req); + else + status = nvmet_parse_admin_cmd(req); + + if (status) + goto fail; + + if (unlikely(!percpu_ref_tryget_live(&sq->ref))) { + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + goto fail; + } + + return true; + +fail: + __nvmet_req_complete(req, status); + return false; +} +EXPORT_SYMBOL_GPL(nvmet_req_init); + +void nvmet_req_uninit(struct nvmet_req *req) +{ + percpu_ref_put(&req->sq->ref); + if (req->ns) + nvmet_put_namespace(req->ns); +} +EXPORT_SYMBOL_GPL(nvmet_req_uninit); + +void nvmet_req_execute(struct nvmet_req *req) +{ + if (unlikely(req->data_len != req->transfer_len)) + nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR); + else + req->execute(req); +} +EXPORT_SYMBOL_GPL(nvmet_req_execute); + +static inline bool nvmet_cc_en(u32 cc) +{ + return (cc >> NVME_CC_EN_SHIFT) & 0x1; +} + +static inline u8 nvmet_cc_css(u32 cc) +{ + return (cc >> NVME_CC_CSS_SHIFT) & 0x7; +} + +static inline u8 nvmet_cc_mps(u32 cc) +{ + return (cc >> NVME_CC_MPS_SHIFT) & 0xf; +} + +static inline u8 nvmet_cc_ams(u32 cc) +{ + return (cc >> NVME_CC_AMS_SHIFT) & 0x7; +} + +static inline u8 nvmet_cc_shn(u32 cc) +{ + return (cc >> NVME_CC_SHN_SHIFT) & 0x3; +} + +static inline u8 nvmet_cc_iosqes(u32 cc) +{ + return (cc >> NVME_CC_IOSQES_SHIFT) & 0xf; +} + +static inline u8 nvmet_cc_iocqes(u32 cc) +{ + return (cc >> NVME_CC_IOCQES_SHIFT) & 0xf; +} + +static void nvmet_start_ctrl(struct nvmet_ctrl *ctrl) +{ + lockdep_assert_held(&ctrl->lock); + + /* + * Only I/O controllers should verify iosqes,iocqes. + * Strictly speaking, the spec says a discovery controller + * should verify iosqes,iocqes are zeroed, however that + * would break backwards compatibility, so don't enforce it. + */ + if (ctrl->subsys->type != NVME_NQN_DISC && + (nvmet_cc_iosqes(ctrl->cc) != NVME_NVM_IOSQES || + nvmet_cc_iocqes(ctrl->cc) != NVME_NVM_IOCQES)) { + ctrl->csts = NVME_CSTS_CFS; + return; + } + + if (nvmet_cc_mps(ctrl->cc) != 0 || + nvmet_cc_ams(ctrl->cc) != 0 || + nvmet_cc_css(ctrl->cc) != 0) { + ctrl->csts = NVME_CSTS_CFS; + return; + } + + ctrl->csts = NVME_CSTS_RDY; + + /* + * Controllers that are not yet enabled should not really enforce the + * keep alive timeout, but we still want to track a timeout and cleanup + * in case a host died before it enabled the controller. Hence, simply + * reset the keep alive timer when the controller is enabled. + */ + if (ctrl->kato) + mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ); +} + +static void nvmet_clear_ctrl(struct nvmet_ctrl *ctrl) +{ + lockdep_assert_held(&ctrl->lock); + + /* XXX: tear down queues? */ + ctrl->csts &= ~NVME_CSTS_RDY; + ctrl->cc = 0; +} + +void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new) +{ + u32 old; + + mutex_lock(&ctrl->lock); + old = ctrl->cc; + ctrl->cc = new; + + if (nvmet_cc_en(new) && !nvmet_cc_en(old)) + nvmet_start_ctrl(ctrl); + if (!nvmet_cc_en(new) && nvmet_cc_en(old)) + nvmet_clear_ctrl(ctrl); + if (nvmet_cc_shn(new) && !nvmet_cc_shn(old)) { + nvmet_clear_ctrl(ctrl); + ctrl->csts |= NVME_CSTS_SHST_CMPLT; + } + if (!nvmet_cc_shn(new) && nvmet_cc_shn(old)) + ctrl->csts &= ~NVME_CSTS_SHST_CMPLT; + mutex_unlock(&ctrl->lock); +} + +static void nvmet_init_cap(struct nvmet_ctrl *ctrl) +{ + /* command sets supported: NVMe command set: */ + ctrl->cap = (1ULL << 37); + /* CC.EN timeout in 500msec units: */ + ctrl->cap |= (15ULL << 24); + /* maximum queue entries supported: */ + ctrl->cap |= NVMET_QUEUE_SIZE - 1; +} + +u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid, + struct nvmet_req *req, struct nvmet_ctrl **ret) +{ + struct nvmet_subsys *subsys; + struct nvmet_ctrl *ctrl; + u16 status = 0; + + subsys = nvmet_find_get_subsys(req->port, subsysnqn); + if (!subsys) { + pr_warn("connect request for invalid subsystem %s!\n", + subsysnqn); + req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn); + return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + } + + mutex_lock(&subsys->lock); + list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { + if (ctrl->cntlid == cntlid) { + if (strncmp(hostnqn, ctrl->hostnqn, NVMF_NQN_SIZE)) { + pr_warn("hostnqn mismatch.\n"); + continue; + } + if (!kref_get_unless_zero(&ctrl->ref)) + continue; + + *ret = ctrl; + goto out; + } + } + + pr_warn("could not find controller %d for subsys %s / host %s\n", + cntlid, subsysnqn, hostnqn); + req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid); + status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + +out: + mutex_unlock(&subsys->lock); + nvmet_subsys_put(subsys); + return status; +} + +u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd) +{ + if (unlikely(!(req->sq->ctrl->cc & NVME_CC_ENABLE))) { + pr_err("got cmd %d while CC.EN == 0 on qid = %d\n", + cmd->common.opcode, req->sq->qid); + return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; + } + + if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) { + pr_err("got cmd %d while CSTS.RDY == 0 on qid = %d\n", + cmd->common.opcode, req->sq->qid); + return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; + } + return 0; +} + +static bool __nvmet_host_allowed(struct nvmet_subsys *subsys, + const char *hostnqn) +{ + struct nvmet_host_link *p; + + if (subsys->allow_any_host) + return true; + + list_for_each_entry(p, &subsys->hosts, entry) { + if (!strcmp(nvmet_host_name(p->host), hostnqn)) + return true; + } + + return false; +} + +static bool nvmet_host_discovery_allowed(struct nvmet_req *req, + const char *hostnqn) +{ + struct nvmet_subsys_link *s; + + list_for_each_entry(s, &req->port->subsystems, entry) { + if (__nvmet_host_allowed(s->subsys, hostnqn)) + return true; + } + + return false; +} + +bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys, + const char *hostnqn) +{ + lockdep_assert_held(&nvmet_config_sem); + + if (subsys->type == NVME_NQN_DISC) + return nvmet_host_discovery_allowed(req, hostnqn); + else + return __nvmet_host_allowed(subsys, hostnqn); +} + +static void nvmet_fatal_error_handler(struct work_struct *work) +{ + struct nvmet_ctrl *ctrl = + container_of(work, struct nvmet_ctrl, fatal_err_work); + + pr_err("ctrl %d fatal error occurred!\n", ctrl->cntlid); + ctrl->ops->delete_ctrl(ctrl); +} + +u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, + struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp) +{ + struct nvmet_subsys *subsys; + struct nvmet_ctrl *ctrl; + int ret; + u16 status; + + status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + subsys = nvmet_find_get_subsys(req->port, subsysnqn); + if (!subsys) { + pr_warn("connect request for invalid subsystem %s!\n", + subsysnqn); + req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn); + goto out; + } + + status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + down_read(&nvmet_config_sem); + if (!nvmet_host_allowed(req, subsys, hostnqn)) { + pr_info("connect by host %s for subsystem %s not allowed\n", + hostnqn, subsysnqn); + req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(hostnqn); + up_read(&nvmet_config_sem); + status = NVME_SC_CONNECT_INVALID_HOST | NVME_SC_DNR; + goto out_put_subsystem; + } + up_read(&nvmet_config_sem); + + status = NVME_SC_INTERNAL; + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + goto out_put_subsystem; + mutex_init(&ctrl->lock); + + nvmet_init_cap(ctrl); + + ctrl->port = req->port; + + INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work); + INIT_LIST_HEAD(&ctrl->async_events); + INIT_WORK(&ctrl->fatal_err_work, nvmet_fatal_error_handler); + + memcpy(ctrl->subsysnqn, subsysnqn, NVMF_NQN_SIZE); + memcpy(ctrl->hostnqn, hostnqn, NVMF_NQN_SIZE); + + kref_init(&ctrl->ref); + ctrl->subsys = subsys; + WRITE_ONCE(ctrl->aen_enabled, NVMET_AEN_CFG_OPTIONAL); + + ctrl->changed_ns_list = kmalloc_array(NVME_MAX_CHANGED_NAMESPACES, + sizeof(__le32), GFP_KERNEL); + if (!ctrl->changed_ns_list) + goto out_free_ctrl; + + ctrl->cqs = kcalloc(subsys->max_qid + 1, + sizeof(struct nvmet_cq *), + GFP_KERNEL); + if (!ctrl->cqs) + goto out_free_changed_ns_list; + + ctrl->sqs = kcalloc(subsys->max_qid + 1, + sizeof(struct nvmet_sq *), + GFP_KERNEL); + if (!ctrl->sqs) + goto out_free_cqs; + + ret = ida_simple_get(&cntlid_ida, + NVME_CNTLID_MIN, NVME_CNTLID_MAX, + GFP_KERNEL); + if (ret < 0) { + status = NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR; + goto out_free_sqs; + } + ctrl->cntlid = ret; + + ctrl->ops = req->ops; + if (ctrl->subsys->type == NVME_NQN_DISC) { + /* Don't accept keep-alive timeout for discovery controllers */ + if (kato) { + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + goto out_remove_ida; + } + + /* + * Discovery controllers use some arbitrary high value in order + * to cleanup stale discovery sessions + * + * From the latest base diff RC: + * "The Keep Alive command is not supported by + * Discovery controllers. A transport may specify a + * fixed Discovery controller activity timeout value + * (e.g., 2 minutes). If no commands are received + * by a Discovery controller within that time + * period, the controller may perform the + * actions for Keep Alive Timer expiration". + */ + ctrl->kato = NVMET_DISC_KATO; + } else { + /* keep-alive timeout in seconds */ + ctrl->kato = DIV_ROUND_UP(kato, 1000); + } + nvmet_start_keep_alive_timer(ctrl); + + mutex_lock(&subsys->lock); + list_add_tail(&ctrl->subsys_entry, &subsys->ctrls); + mutex_unlock(&subsys->lock); + + *ctrlp = ctrl; + return 0; + +out_remove_ida: + ida_simple_remove(&cntlid_ida, ctrl->cntlid); +out_free_sqs: + kfree(ctrl->sqs); +out_free_cqs: + kfree(ctrl->cqs); +out_free_changed_ns_list: + kfree(ctrl->changed_ns_list); +out_free_ctrl: + kfree(ctrl); +out_put_subsystem: + nvmet_subsys_put(subsys); +out: + return status; +} + +static void nvmet_ctrl_free(struct kref *ref) +{ + struct nvmet_ctrl *ctrl = container_of(ref, struct nvmet_ctrl, ref); + struct nvmet_subsys *subsys = ctrl->subsys; + + mutex_lock(&subsys->lock); + list_del(&ctrl->subsys_entry); + mutex_unlock(&subsys->lock); + + nvmet_stop_keep_alive_timer(ctrl); + + flush_work(&ctrl->async_event_work); + cancel_work_sync(&ctrl->fatal_err_work); + + ida_simple_remove(&cntlid_ida, ctrl->cntlid); + + kfree(ctrl->sqs); + kfree(ctrl->cqs); + kfree(ctrl->changed_ns_list); + kfree(ctrl); + + nvmet_subsys_put(subsys); +} + +void nvmet_ctrl_put(struct nvmet_ctrl *ctrl) +{ + kref_put(&ctrl->ref, nvmet_ctrl_free); +} + +void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl) +{ + mutex_lock(&ctrl->lock); + if (!(ctrl->csts & NVME_CSTS_CFS)) { + ctrl->csts |= NVME_CSTS_CFS; + schedule_work(&ctrl->fatal_err_work); + } + mutex_unlock(&ctrl->lock); +} +EXPORT_SYMBOL_GPL(nvmet_ctrl_fatal_error); + +static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port, + const char *subsysnqn) +{ + struct nvmet_subsys_link *p; + + if (!port) + return NULL; + + if (!strncmp(NVME_DISC_SUBSYS_NAME, subsysnqn, + NVMF_NQN_SIZE)) { + if (!kref_get_unless_zero(&nvmet_disc_subsys->ref)) + return NULL; + return nvmet_disc_subsys; + } + + down_read(&nvmet_config_sem); + list_for_each_entry(p, &port->subsystems, entry) { + if (!strncmp(p->subsys->subsysnqn, subsysnqn, + NVMF_NQN_SIZE)) { + if (!kref_get_unless_zero(&p->subsys->ref)) + break; + up_read(&nvmet_config_sem); + return p->subsys; + } + } + up_read(&nvmet_config_sem); + return NULL; +} + +struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, + enum nvme_subsys_type type) +{ + struct nvmet_subsys *subsys; + + subsys = kzalloc(sizeof(*subsys), GFP_KERNEL); + if (!subsys) + return NULL; + + subsys->ver = NVME_VS(1, 3, 0); /* NVMe 1.3.0 */ + /* generate a random serial number as our controllers are ephemeral: */ + get_random_bytes(&subsys->serial, sizeof(subsys->serial)); + + switch (type) { + case NVME_NQN_NVME: + subsys->max_qid = NVMET_NR_QUEUES; + break; + case NVME_NQN_DISC: + subsys->max_qid = 0; + break; + default: + pr_err("%s: Unknown Subsystem type - %d\n", __func__, type); + kfree(subsys); + return NULL; + } + subsys->type = type; + subsys->subsysnqn = kstrndup(subsysnqn, NVMF_NQN_SIZE, + GFP_KERNEL); + if (!subsys->subsysnqn) { + kfree(subsys); + return NULL; + } + + kref_init(&subsys->ref); + + mutex_init(&subsys->lock); + INIT_LIST_HEAD(&subsys->namespaces); + INIT_LIST_HEAD(&subsys->ctrls); + INIT_LIST_HEAD(&subsys->hosts); + + return subsys; +} + +static void nvmet_subsys_free(struct kref *ref) +{ + struct nvmet_subsys *subsys = + container_of(ref, struct nvmet_subsys, ref); + + WARN_ON_ONCE(!list_empty(&subsys->namespaces)); + + kfree(subsys->subsysnqn); + kfree(subsys); +} + +void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys) +{ + struct nvmet_ctrl *ctrl; + + mutex_lock(&subsys->lock); + list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) + ctrl->ops->delete_ctrl(ctrl); + mutex_unlock(&subsys->lock); +} + +void nvmet_subsys_put(struct nvmet_subsys *subsys) +{ + kref_put(&subsys->ref, nvmet_subsys_free); +} + +static int __init nvmet_init(void) +{ + int error; + + nvmet_ana_group_enabled[NVMET_DEFAULT_ANA_GRPID] = 1; + + buffered_io_wq = alloc_workqueue("nvmet-buffered-io-wq", + WQ_MEM_RECLAIM, 0); + if (!buffered_io_wq) { + error = -ENOMEM; + goto out; + } + + error = nvmet_init_discovery(); + if (error) + goto out_free_work_queue; + + error = nvmet_init_configfs(); + if (error) + goto out_exit_discovery; + return 0; + +out_exit_discovery: + nvmet_exit_discovery(); +out_free_work_queue: + destroy_workqueue(buffered_io_wq); +out: + return error; +} + +static void __exit nvmet_exit(void) +{ + nvmet_exit_configfs(); + nvmet_exit_discovery(); + ida_destroy(&cntlid_ida); + destroy_workqueue(buffered_io_wq); + + BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_entry) != 1024); + BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_hdr) != 1024); +} + +module_init(nvmet_init); +module_exit(nvmet_exit); + +MODULE_LICENSE("GPL v2"); diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c new file mode 100644 index 000000000..eae29f493 --- /dev/null +++ b/drivers/nvme/target/discovery.c @@ -0,0 +1,242 @@ +/* + * Discovery service for the NVMe over Fabrics target. + * Copyright (C) 2016 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/slab.h> +#include <generated/utsrelease.h> +#include "nvmet.h" + +struct nvmet_subsys *nvmet_disc_subsys; + +u64 nvmet_genctr; + +void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port) +{ + down_write(&nvmet_config_sem); + if (list_empty(&port->entry)) { + list_add_tail(&port->entry, &parent->referrals); + port->enabled = true; + nvmet_genctr++; + } + up_write(&nvmet_config_sem); +} + +void nvmet_referral_disable(struct nvmet_port *port) +{ + down_write(&nvmet_config_sem); + if (!list_empty(&port->entry)) { + port->enabled = false; + list_del_init(&port->entry); + nvmet_genctr++; + } + up_write(&nvmet_config_sem); +} + +static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr, + struct nvmet_port *port, char *subsys_nqn, char *traddr, + u8 type, u32 numrec) +{ + struct nvmf_disc_rsp_page_entry *e = &hdr->entries[numrec]; + + e->trtype = port->disc_addr.trtype; + e->adrfam = port->disc_addr.adrfam; + e->treq = port->disc_addr.treq; + e->portid = port->disc_addr.portid; + /* we support only dynamic controllers */ + e->cntlid = cpu_to_le16(NVME_CNTLID_DYNAMIC); + e->asqsz = cpu_to_le16(NVME_AQ_DEPTH); + e->subtype = type; + memcpy(e->trsvcid, port->disc_addr.trsvcid, NVMF_TRSVCID_SIZE); + memcpy(e->traddr, traddr, NVMF_TRADDR_SIZE); + memcpy(e->tsas.common, port->disc_addr.tsas.common, NVMF_TSAS_SIZE); + strncpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE); +} + +/* + * nvmet_set_disc_traddr - set a correct discovery log entry traddr + * + * IP based transports (e.g RDMA) can listen on "any" ipv4/ipv6 addresses + * (INADDR_ANY or IN6ADDR_ANY_INIT). The discovery log page traddr reply + * must not contain that "any" IP address. If the transport implements + * .disc_traddr, use it. this callback will set the discovery traddr + * from the req->port address in case the port in question listens + * "any" IP address. + */ +static void nvmet_set_disc_traddr(struct nvmet_req *req, struct nvmet_port *port, + char *traddr) +{ + if (req->ops->disc_traddr) + req->ops->disc_traddr(req, port, traddr); + else + memcpy(traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE); +} + +static void nvmet_execute_get_disc_log_page(struct nvmet_req *req) +{ + const int entry_size = sizeof(struct nvmf_disc_rsp_page_entry); + struct nvmet_ctrl *ctrl = req->sq->ctrl; + struct nvmf_disc_rsp_page_hdr *hdr; + size_t data_len = nvmet_get_log_page_len(req->cmd); + size_t alloc_len = max(data_len, sizeof(*hdr)); + int residual_len = data_len - sizeof(*hdr); + struct nvmet_subsys_link *p; + struct nvmet_port *r; + u32 numrec = 0; + u16 status = 0; + + /* + * Make sure we're passing at least a buffer of response header size. + * If host provided data len is less than the header size, only the + * number of bytes requested by host will be sent to host. + */ + hdr = kzalloc(alloc_len, GFP_KERNEL); + if (!hdr) { + status = NVME_SC_INTERNAL; + goto out; + } + + down_read(&nvmet_config_sem); + list_for_each_entry(p, &req->port->subsystems, entry) { + if (!nvmet_host_allowed(req, p->subsys, ctrl->hostnqn)) + continue; + if (residual_len >= entry_size) { + char traddr[NVMF_TRADDR_SIZE]; + + nvmet_set_disc_traddr(req, req->port, traddr); + nvmet_format_discovery_entry(hdr, req->port, + p->subsys->subsysnqn, traddr, + NVME_NQN_NVME, numrec); + residual_len -= entry_size; + } + numrec++; + } + + list_for_each_entry(r, &req->port->referrals, entry) { + if (residual_len >= entry_size) { + nvmet_format_discovery_entry(hdr, r, + NVME_DISC_SUBSYS_NAME, + r->disc_addr.traddr, + NVME_NQN_DISC, numrec); + residual_len -= entry_size; + } + numrec++; + } + + hdr->genctr = cpu_to_le64(nvmet_genctr); + hdr->numrec = cpu_to_le64(numrec); + hdr->recfmt = cpu_to_le16(0); + + up_read(&nvmet_config_sem); + + status = nvmet_copy_to_sgl(req, 0, hdr, data_len); + kfree(hdr); +out: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_identify_disc_ctrl(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + struct nvme_id_ctrl *id; + u16 status = 0; + + id = kzalloc(sizeof(*id), GFP_KERNEL); + if (!id) { + status = NVME_SC_INTERNAL; + goto out; + } + + memset(id->fr, ' ', sizeof(id->fr)); + strncpy((char *)id->fr, UTS_RELEASE, sizeof(id->fr)); + + /* no limit on data transfer sizes for now */ + id->mdts = 0; + id->cntlid = cpu_to_le16(ctrl->cntlid); + id->ver = cpu_to_le32(ctrl->subsys->ver); + id->lpa = (1 << 2); + + /* no enforcement soft-limit for maxcmd - pick arbitrary high value */ + id->maxcmd = cpu_to_le16(NVMET_MAX_CMD); + + id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */ + if (ctrl->ops->has_keyed_sgls) + id->sgls |= cpu_to_le32(1 << 2); + if (req->port->inline_data_size) + id->sgls |= cpu_to_le32(1 << 20); + + strcpy(id->subnqn, ctrl->subsys->subsysnqn); + + status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id)); + + kfree(id); +out: + nvmet_req_complete(req, status); +} + +u16 nvmet_parse_discovery_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) { + pr_err("got cmd %d while not ready\n", + cmd->common.opcode); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + + switch (cmd->common.opcode) { + case nvme_admin_get_log_page: + req->data_len = nvmet_get_log_page_len(cmd); + + switch (cmd->get_log_page.lid) { + case NVME_LOG_DISC: + req->execute = nvmet_execute_get_disc_log_page; + return 0; + default: + pr_err("unsupported get_log_page lid %d\n", + cmd->get_log_page.lid); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + case nvme_admin_identify: + req->data_len = NVME_IDENTIFY_DATA_SIZE; + switch (cmd->identify.cns) { + case NVME_ID_CNS_CTRL: + req->execute = + nvmet_execute_identify_disc_ctrl; + return 0; + default: + pr_err("unsupported identify cns %d\n", + cmd->identify.cns); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + default: + pr_err("unsupported cmd %d\n", cmd->common.opcode); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + + pr_err("unhandled cmd %d\n", cmd->common.opcode); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; +} + +int __init nvmet_init_discovery(void) +{ + nvmet_disc_subsys = + nvmet_subsys_alloc(NVME_DISC_SUBSYS_NAME, NVME_NQN_DISC); + if (!nvmet_disc_subsys) + return -ENOMEM; + return 0; +} + +void nvmet_exit_discovery(void) +{ + nvmet_subsys_put(nvmet_disc_subsys); +} diff --git a/drivers/nvme/target/fabrics-cmd.c b/drivers/nvme/target/fabrics-cmd.c new file mode 100644 index 000000000..d84ae004c --- /dev/null +++ b/drivers/nvme/target/fabrics-cmd.c @@ -0,0 +1,260 @@ +/* + * NVMe Fabrics command implementation. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/blkdev.h> +#include "nvmet.h" + +static void nvmet_execute_prop_set(struct nvmet_req *req) +{ + u16 status = 0; + + if (!(req->cmd->prop_set.attrib & 1)) { + u64 val = le64_to_cpu(req->cmd->prop_set.value); + + switch (le32_to_cpu(req->cmd->prop_set.offset)) { + case NVME_REG_CC: + nvmet_update_cc(req->sq->ctrl, val); + break; + default: + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + } else { + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } + + nvmet_req_complete(req, status); +} + +static void nvmet_execute_prop_get(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + u16 status = 0; + u64 val = 0; + + if (req->cmd->prop_get.attrib & 1) { + switch (le32_to_cpu(req->cmd->prop_get.offset)) { + case NVME_REG_CAP: + val = ctrl->cap; + break; + default: + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + } else { + switch (le32_to_cpu(req->cmd->prop_get.offset)) { + case NVME_REG_VS: + val = ctrl->subsys->ver; + break; + case NVME_REG_CC: + val = ctrl->cc; + break; + case NVME_REG_CSTS: + val = ctrl->csts; + break; + default: + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + } + + req->rsp->result.u64 = cpu_to_le64(val); + nvmet_req_complete(req, status); +} + +u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + switch (cmd->fabrics.fctype) { + case nvme_fabrics_type_property_set: + req->data_len = 0; + req->execute = nvmet_execute_prop_set; + break; + case nvme_fabrics_type_property_get: + req->data_len = 0; + req->execute = nvmet_execute_prop_get; + break; + default: + pr_err("received unknown capsule type 0x%x\n", + cmd->fabrics.fctype); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + + return 0; +} + +static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req) +{ + struct nvmf_connect_command *c = &req->cmd->connect; + u16 qid = le16_to_cpu(c->qid); + u16 sqsize = le16_to_cpu(c->sqsize); + struct nvmet_ctrl *old; + + old = cmpxchg(&req->sq->ctrl, NULL, ctrl); + if (old) { + pr_warn("queue already connected!\n"); + return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR; + } + if (!sqsize) { + pr_warn("queue size zero!\n"); + return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + } + + /* note: convert queue size from 0's-based value to 1's-based value */ + nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1); + nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1); + return 0; +} + +static void nvmet_execute_admin_connect(struct nvmet_req *req) +{ + struct nvmf_connect_command *c = &req->cmd->connect; + struct nvmf_connect_data *d; + struct nvmet_ctrl *ctrl = NULL; + u16 status = 0; + + d = kmalloc(sizeof(*d), GFP_KERNEL); + if (!d) { + status = NVME_SC_INTERNAL; + goto complete; + } + + status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d)); + if (status) + goto out; + + /* zero out initial completion result, assign values as needed */ + req->rsp->result.u32 = 0; + + if (c->recfmt != 0) { + pr_warn("invalid connect version (%d).\n", + le16_to_cpu(c->recfmt)); + status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; + goto out; + } + + if (unlikely(d->cntlid != cpu_to_le16(0xffff))) { + pr_warn("connect attempt for invalid controller ID %#x\n", + d->cntlid); + status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid); + goto out; + } + + status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req, + le32_to_cpu(c->kato), &ctrl); + if (status) + goto out; + uuid_copy(&ctrl->hostid, &d->hostid); + + status = nvmet_install_queue(ctrl, req); + if (status) { + nvmet_ctrl_put(ctrl); + goto out; + } + + pr_info("creating controller %d for subsystem %s for NQN %s.\n", + ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn); + req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid); + +out: + kfree(d); +complete: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_io_connect(struct nvmet_req *req) +{ + struct nvmf_connect_command *c = &req->cmd->connect; + struct nvmf_connect_data *d; + struct nvmet_ctrl *ctrl = NULL; + u16 qid = le16_to_cpu(c->qid); + u16 status = 0; + + d = kmalloc(sizeof(*d), GFP_KERNEL); + if (!d) { + status = NVME_SC_INTERNAL; + goto complete; + } + + status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d)); + if (status) + goto out; + + /* zero out initial completion result, assign values as needed */ + req->rsp->result.u32 = 0; + + if (c->recfmt != 0) { + pr_warn("invalid connect version (%d).\n", + le16_to_cpu(c->recfmt)); + status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; + goto out; + } + + status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn, + le16_to_cpu(d->cntlid), + req, &ctrl); + if (status) + goto out; + + if (unlikely(qid > ctrl->subsys->max_qid)) { + pr_warn("invalid queue id (%d)\n", qid); + status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + req->rsp->result.u32 = IPO_IATTR_CONNECT_SQE(qid); + goto out_ctrl_put; + } + + status = nvmet_install_queue(ctrl, req); + if (status) { + /* pass back cntlid that had the issue of installing queue */ + req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid); + goto out_ctrl_put; + } + + pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid); + +out: + kfree(d); +complete: + nvmet_req_complete(req, status); + return; + +out_ctrl_put: + nvmet_ctrl_put(ctrl); + goto out; +} + +u16 nvmet_parse_connect_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + if (cmd->common.opcode != nvme_fabrics_command) { + pr_err("invalid command 0x%x on unconnected queue.\n", + cmd->fabrics.opcode); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + if (cmd->fabrics.fctype != nvme_fabrics_type_connect) { + pr_err("invalid capsule type 0x%x on unconnected queue.\n", + cmd->fabrics.fctype); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + + req->data_len = sizeof(struct nvmf_connect_data); + if (cmd->connect.qid == 0) + req->execute = nvmet_execute_admin_connect; + else + req->execute = nvmet_execute_io_connect; + return 0; +} diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c new file mode 100644 index 000000000..77e4d184b --- /dev/null +++ b/drivers/nvme/target/fc.c @@ -0,0 +1,2576 @@ +/* + * Copyright (c) 2016 Avago Technologies. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful. + * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, + * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A + * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO + * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID. + * See the GNU General Public License for more details, a copy of which + * can be found in the file COPYING included with this package + * + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/blk-mq.h> +#include <linux/parser.h> +#include <linux/random.h> +#include <uapi/scsi/fc/fc_fs.h> +#include <uapi/scsi/fc/fc_els.h> + +#include "nvmet.h" +#include <linux/nvme-fc-driver.h> +#include <linux/nvme-fc.h> + + +/* *************************** Data Structures/Defines ****************** */ + + +#define NVMET_LS_CTX_COUNT 256 + +/* for this implementation, assume small single frame rqst/rsp */ +#define NVME_FC_MAX_LS_BUFFER_SIZE 2048 + +struct nvmet_fc_tgtport; +struct nvmet_fc_tgt_assoc; + +struct nvmet_fc_ls_iod { + struct nvmefc_tgt_ls_req *lsreq; + struct nvmefc_tgt_fcp_req *fcpreq; /* only if RS */ + + struct list_head ls_list; /* tgtport->ls_list */ + + struct nvmet_fc_tgtport *tgtport; + struct nvmet_fc_tgt_assoc *assoc; + + u8 *rqstbuf; + u8 *rspbuf; + u16 rqstdatalen; + dma_addr_t rspdma; + + struct scatterlist sg[2]; + + struct work_struct work; +} __aligned(sizeof(unsigned long long)); + +/* desired maximum for a single sequence - if sg list allows it */ +#define NVMET_FC_MAX_SEQ_LENGTH (256 * 1024) + +enum nvmet_fcp_datadir { + NVMET_FCP_NODATA, + NVMET_FCP_WRITE, + NVMET_FCP_READ, + NVMET_FCP_ABORTED, +}; + +struct nvmet_fc_fcp_iod { + struct nvmefc_tgt_fcp_req *fcpreq; + + struct nvme_fc_cmd_iu cmdiubuf; + struct nvme_fc_ersp_iu rspiubuf; + dma_addr_t rspdma; + struct scatterlist *next_sg; + struct scatterlist *data_sg; + int data_sg_cnt; + u32 offset; + enum nvmet_fcp_datadir io_dir; + bool active; + bool abort; + bool aborted; + bool writedataactive; + spinlock_t flock; + + struct nvmet_req req; + struct work_struct work; + struct work_struct done_work; + struct work_struct defer_work; + + struct nvmet_fc_tgtport *tgtport; + struct nvmet_fc_tgt_queue *queue; + + struct list_head fcp_list; /* tgtport->fcp_list */ +}; + +struct nvmet_fc_tgtport { + + struct nvmet_fc_target_port fc_target_port; + + struct list_head tgt_list; /* nvmet_fc_target_list */ + struct device *dev; /* dev for dma mapping */ + struct nvmet_fc_target_template *ops; + + struct nvmet_fc_ls_iod *iod; + spinlock_t lock; + struct list_head ls_list; + struct list_head ls_busylist; + struct list_head assoc_list; + struct ida assoc_cnt; + struct nvmet_port *port; + struct kref ref; + u32 max_sg_cnt; +}; + +struct nvmet_fc_defer_fcp_req { + struct list_head req_list; + struct nvmefc_tgt_fcp_req *fcp_req; +}; + +struct nvmet_fc_tgt_queue { + bool ninetypercent; + u16 qid; + u16 sqsize; + u16 ersp_ratio; + __le16 sqhd; + int cpu; + atomic_t connected; + atomic_t sqtail; + atomic_t zrspcnt; + atomic_t rsn; + spinlock_t qlock; + struct nvmet_port *port; + struct nvmet_cq nvme_cq; + struct nvmet_sq nvme_sq; + struct nvmet_fc_tgt_assoc *assoc; + struct nvmet_fc_fcp_iod *fod; /* array of fcp_iods */ + struct list_head fod_list; + struct list_head pending_cmd_list; + struct list_head avail_defer_list; + struct workqueue_struct *work_q; + struct kref ref; +} __aligned(sizeof(unsigned long long)); + +struct nvmet_fc_tgt_assoc { + u64 association_id; + u32 a_id; + struct nvmet_fc_tgtport *tgtport; + struct list_head a_list; + struct nvmet_fc_tgt_queue *queues[NVMET_NR_QUEUES + 1]; + struct kref ref; + struct work_struct del_work; +}; + + +static inline int +nvmet_fc_iodnum(struct nvmet_fc_ls_iod *iodptr) +{ + return (iodptr - iodptr->tgtport->iod); +} + +static inline int +nvmet_fc_fodnum(struct nvmet_fc_fcp_iod *fodptr) +{ + return (fodptr - fodptr->queue->fod); +} + + +/* + * Association and Connection IDs: + * + * Association ID will have random number in upper 6 bytes and zero + * in lower 2 bytes + * + * Connection IDs will be Association ID with QID or'd in lower 2 bytes + * + * note: Association ID = Connection ID for queue 0 + */ +#define BYTES_FOR_QID sizeof(u16) +#define BYTES_FOR_QID_SHIFT (BYTES_FOR_QID * 8) +#define NVMET_FC_QUEUEID_MASK ((u64)((1 << BYTES_FOR_QID_SHIFT) - 1)) + +static inline u64 +nvmet_fc_makeconnid(struct nvmet_fc_tgt_assoc *assoc, u16 qid) +{ + return (assoc->association_id | qid); +} + +static inline u64 +nvmet_fc_getassociationid(u64 connectionid) +{ + return connectionid & ~NVMET_FC_QUEUEID_MASK; +} + +static inline u16 +nvmet_fc_getqueueid(u64 connectionid) +{ + return (u16)(connectionid & NVMET_FC_QUEUEID_MASK); +} + +static inline struct nvmet_fc_tgtport * +targetport_to_tgtport(struct nvmet_fc_target_port *targetport) +{ + return container_of(targetport, struct nvmet_fc_tgtport, + fc_target_port); +} + +static inline struct nvmet_fc_fcp_iod * +nvmet_req_to_fod(struct nvmet_req *nvme_req) +{ + return container_of(nvme_req, struct nvmet_fc_fcp_iod, req); +} + + +/* *************************** Globals **************************** */ + + +static DEFINE_SPINLOCK(nvmet_fc_tgtlock); + +static LIST_HEAD(nvmet_fc_target_list); +static DEFINE_IDA(nvmet_fc_tgtport_cnt); + + +static void nvmet_fc_handle_ls_rqst_work(struct work_struct *work); +static void nvmet_fc_handle_fcp_rqst_work(struct work_struct *work); +static void nvmet_fc_fcp_rqst_op_done_work(struct work_struct *work); +static void nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work); +static void nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc); +static int nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc); +static void nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue); +static int nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue); +static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport); +static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport); +static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_fcp_iod *fod); +static void nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc); + + +/* *********************** FC-NVME DMA Handling **************************** */ + +/* + * The fcloop device passes in a NULL device pointer. Real LLD's will + * pass in a valid device pointer. If NULL is passed to the dma mapping + * routines, depending on the platform, it may or may not succeed, and + * may crash. + * + * As such: + * Wrapper all the dma routines and check the dev pointer. + * + * If simple mappings (return just a dma address, we'll noop them, + * returning a dma address of 0. + * + * On more complex mappings (dma_map_sg), a pseudo routine fills + * in the scatter list, setting all dma addresses to 0. + */ + +static inline dma_addr_t +fc_dma_map_single(struct device *dev, void *ptr, size_t size, + enum dma_data_direction dir) +{ + return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L; +} + +static inline int +fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return dev ? dma_mapping_error(dev, dma_addr) : 0; +} + +static inline void +fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir) +{ + if (dev) + dma_unmap_single(dev, addr, size, dir); +} + +static inline void +fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir) +{ + if (dev) + dma_sync_single_for_cpu(dev, addr, size, dir); +} + +static inline void +fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir) +{ + if (dev) + dma_sync_single_for_device(dev, addr, size, dir); +} + +/* pseudo dma_map_sg call */ +static int +fc_map_sg(struct scatterlist *sg, int nents) +{ + struct scatterlist *s; + int i; + + WARN_ON(nents == 0 || sg[0].length == 0); + + for_each_sg(sg, s, nents, i) { + s->dma_address = 0L; +#ifdef CONFIG_NEED_SG_DMA_LENGTH + s->dma_length = s->length; +#endif + } + return nents; +} + +static inline int +fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction dir) +{ + return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents); +} + +static inline void +fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction dir) +{ + if (dev) + dma_unmap_sg(dev, sg, nents, dir); +} + + +/* *********************** FC-NVME Port Management ************************ */ + + +static int +nvmet_fc_alloc_ls_iodlist(struct nvmet_fc_tgtport *tgtport) +{ + struct nvmet_fc_ls_iod *iod; + int i; + + iod = kcalloc(NVMET_LS_CTX_COUNT, sizeof(struct nvmet_fc_ls_iod), + GFP_KERNEL); + if (!iod) + return -ENOMEM; + + tgtport->iod = iod; + + for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { + INIT_WORK(&iod->work, nvmet_fc_handle_ls_rqst_work); + iod->tgtport = tgtport; + list_add_tail(&iod->ls_list, &tgtport->ls_list); + + iod->rqstbuf = kcalloc(2, NVME_FC_MAX_LS_BUFFER_SIZE, + GFP_KERNEL); + if (!iod->rqstbuf) + goto out_fail; + + iod->rspbuf = iod->rqstbuf + NVME_FC_MAX_LS_BUFFER_SIZE; + + iod->rspdma = fc_dma_map_single(tgtport->dev, iod->rspbuf, + NVME_FC_MAX_LS_BUFFER_SIZE, + DMA_TO_DEVICE); + if (fc_dma_mapping_error(tgtport->dev, iod->rspdma)) + goto out_fail; + } + + return 0; + +out_fail: + kfree(iod->rqstbuf); + list_del(&iod->ls_list); + for (iod--, i--; i >= 0; iod--, i--) { + fc_dma_unmap_single(tgtport->dev, iod->rspdma, + NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE); + kfree(iod->rqstbuf); + list_del(&iod->ls_list); + } + + kfree(iod); + + return -EFAULT; +} + +static void +nvmet_fc_free_ls_iodlist(struct nvmet_fc_tgtport *tgtport) +{ + struct nvmet_fc_ls_iod *iod = tgtport->iod; + int i; + + for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { + fc_dma_unmap_single(tgtport->dev, + iod->rspdma, NVME_FC_MAX_LS_BUFFER_SIZE, + DMA_TO_DEVICE); + kfree(iod->rqstbuf); + list_del(&iod->ls_list); + } + kfree(tgtport->iod); +} + +static struct nvmet_fc_ls_iod * +nvmet_fc_alloc_ls_iod(struct nvmet_fc_tgtport *tgtport) +{ + struct nvmet_fc_ls_iod *iod; + unsigned long flags; + + spin_lock_irqsave(&tgtport->lock, flags); + iod = list_first_entry_or_null(&tgtport->ls_list, + struct nvmet_fc_ls_iod, ls_list); + if (iod) + list_move_tail(&iod->ls_list, &tgtport->ls_busylist); + spin_unlock_irqrestore(&tgtport->lock, flags); + return iod; +} + + +static void +nvmet_fc_free_ls_iod(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_ls_iod *iod) +{ + unsigned long flags; + + spin_lock_irqsave(&tgtport->lock, flags); + list_move(&iod->ls_list, &tgtport->ls_list); + spin_unlock_irqrestore(&tgtport->lock, flags); +} + +static void +nvmet_fc_prep_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_tgt_queue *queue) +{ + struct nvmet_fc_fcp_iod *fod = queue->fod; + int i; + + for (i = 0; i < queue->sqsize; fod++, i++) { + INIT_WORK(&fod->work, nvmet_fc_handle_fcp_rqst_work); + INIT_WORK(&fod->done_work, nvmet_fc_fcp_rqst_op_done_work); + INIT_WORK(&fod->defer_work, nvmet_fc_fcp_rqst_op_defer_work); + fod->tgtport = tgtport; + fod->queue = queue; + fod->active = false; + fod->abort = false; + fod->aborted = false; + fod->fcpreq = NULL; + list_add_tail(&fod->fcp_list, &queue->fod_list); + spin_lock_init(&fod->flock); + + fod->rspdma = fc_dma_map_single(tgtport->dev, &fod->rspiubuf, + sizeof(fod->rspiubuf), DMA_TO_DEVICE); + if (fc_dma_mapping_error(tgtport->dev, fod->rspdma)) { + list_del(&fod->fcp_list); + for (fod--, i--; i >= 0; fod--, i--) { + fc_dma_unmap_single(tgtport->dev, fod->rspdma, + sizeof(fod->rspiubuf), + DMA_TO_DEVICE); + fod->rspdma = 0L; + list_del(&fod->fcp_list); + } + + return; + } + } +} + +static void +nvmet_fc_destroy_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_tgt_queue *queue) +{ + struct nvmet_fc_fcp_iod *fod = queue->fod; + int i; + + for (i = 0; i < queue->sqsize; fod++, i++) { + if (fod->rspdma) + fc_dma_unmap_single(tgtport->dev, fod->rspdma, + sizeof(fod->rspiubuf), DMA_TO_DEVICE); + } +} + +static struct nvmet_fc_fcp_iod * +nvmet_fc_alloc_fcp_iod(struct nvmet_fc_tgt_queue *queue) +{ + struct nvmet_fc_fcp_iod *fod; + + lockdep_assert_held(&queue->qlock); + + fod = list_first_entry_or_null(&queue->fod_list, + struct nvmet_fc_fcp_iod, fcp_list); + if (fod) { + list_del(&fod->fcp_list); + fod->active = true; + /* + * no queue reference is taken, as it was taken by the + * queue lookup just prior to the allocation. The iod + * will "inherit" that reference. + */ + } + return fod; +} + + +static void +nvmet_fc_queue_fcp_req(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_tgt_queue *queue, + struct nvmefc_tgt_fcp_req *fcpreq) +{ + struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; + + /* + * put all admin cmds on hw queue id 0. All io commands go to + * the respective hw queue based on a modulo basis + */ + fcpreq->hwqid = queue->qid ? + ((queue->qid - 1) % tgtport->ops->max_hw_queues) : 0; + + if (tgtport->ops->target_features & NVMET_FCTGTFEAT_CMD_IN_ISR) + queue_work_on(queue->cpu, queue->work_q, &fod->work); + else + nvmet_fc_handle_fcp_rqst(tgtport, fod); +} + +static void +nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work) +{ + struct nvmet_fc_fcp_iod *fod = + container_of(work, struct nvmet_fc_fcp_iod, defer_work); + + /* Submit deferred IO for processing */ + nvmet_fc_queue_fcp_req(fod->tgtport, fod->queue, fod->fcpreq); + +} + +static void +nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue, + struct nvmet_fc_fcp_iod *fod) +{ + struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; + struct nvmet_fc_tgtport *tgtport = fod->tgtport; + struct nvmet_fc_defer_fcp_req *deferfcp; + unsigned long flags; + + fc_dma_sync_single_for_cpu(tgtport->dev, fod->rspdma, + sizeof(fod->rspiubuf), DMA_TO_DEVICE); + + fcpreq->nvmet_fc_private = NULL; + + fod->active = false; + fod->abort = false; + fod->aborted = false; + fod->writedataactive = false; + fod->fcpreq = NULL; + + tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq); + + /* release the queue lookup reference on the completed IO */ + nvmet_fc_tgt_q_put(queue); + + spin_lock_irqsave(&queue->qlock, flags); + deferfcp = list_first_entry_or_null(&queue->pending_cmd_list, + struct nvmet_fc_defer_fcp_req, req_list); + if (!deferfcp) { + list_add_tail(&fod->fcp_list, &fod->queue->fod_list); + spin_unlock_irqrestore(&queue->qlock, flags); + return; + } + + /* Re-use the fod for the next pending cmd that was deferred */ + list_del(&deferfcp->req_list); + + fcpreq = deferfcp->fcp_req; + + /* deferfcp can be reused for another IO at a later date */ + list_add_tail(&deferfcp->req_list, &queue->avail_defer_list); + + spin_unlock_irqrestore(&queue->qlock, flags); + + /* Save NVME CMD IO in fod */ + memcpy(&fod->cmdiubuf, fcpreq->rspaddr, fcpreq->rsplen); + + /* Setup new fcpreq to be processed */ + fcpreq->rspaddr = NULL; + fcpreq->rsplen = 0; + fcpreq->nvmet_fc_private = fod; + fod->fcpreq = fcpreq; + fod->active = true; + + /* inform LLDD IO is now being processed */ + tgtport->ops->defer_rcv(&tgtport->fc_target_port, fcpreq); + + /* + * Leave the queue lookup get reference taken when + * fod was originally allocated. + */ + + queue_work(queue->work_q, &fod->defer_work); +} + +static int +nvmet_fc_queue_to_cpu(struct nvmet_fc_tgtport *tgtport, int qid) +{ + int cpu, idx, cnt; + + if (tgtport->ops->max_hw_queues == 1) + return WORK_CPU_UNBOUND; + + /* Simple cpu selection based on qid modulo active cpu count */ + idx = !qid ? 0 : (qid - 1) % num_active_cpus(); + + /* find the n'th active cpu */ + for (cpu = 0, cnt = 0; ; ) { + if (cpu_active(cpu)) { + if (cnt == idx) + break; + cnt++; + } + cpu = (cpu + 1) % num_possible_cpus(); + } + + return cpu; +} + +static struct nvmet_fc_tgt_queue * +nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc, + u16 qid, u16 sqsize) +{ + struct nvmet_fc_tgt_queue *queue; + unsigned long flags; + int ret; + + if (qid > NVMET_NR_QUEUES) + return NULL; + + queue = kzalloc((sizeof(*queue) + + (sizeof(struct nvmet_fc_fcp_iod) * sqsize)), + GFP_KERNEL); + if (!queue) + return NULL; + + if (!nvmet_fc_tgt_a_get(assoc)) + goto out_free_queue; + + queue->work_q = alloc_workqueue("ntfc%d.%d.%d", 0, 0, + assoc->tgtport->fc_target_port.port_num, + assoc->a_id, qid); + if (!queue->work_q) + goto out_a_put; + + queue->fod = (struct nvmet_fc_fcp_iod *)&queue[1]; + queue->qid = qid; + queue->sqsize = sqsize; + queue->assoc = assoc; + queue->port = assoc->tgtport->port; + queue->cpu = nvmet_fc_queue_to_cpu(assoc->tgtport, qid); + INIT_LIST_HEAD(&queue->fod_list); + INIT_LIST_HEAD(&queue->avail_defer_list); + INIT_LIST_HEAD(&queue->pending_cmd_list); + atomic_set(&queue->connected, 0); + atomic_set(&queue->sqtail, 0); + atomic_set(&queue->rsn, 1); + atomic_set(&queue->zrspcnt, 0); + spin_lock_init(&queue->qlock); + kref_init(&queue->ref); + + nvmet_fc_prep_fcp_iodlist(assoc->tgtport, queue); + + ret = nvmet_sq_init(&queue->nvme_sq); + if (ret) + goto out_fail_iodlist; + + WARN_ON(assoc->queues[qid]); + spin_lock_irqsave(&assoc->tgtport->lock, flags); + assoc->queues[qid] = queue; + spin_unlock_irqrestore(&assoc->tgtport->lock, flags); + + return queue; + +out_fail_iodlist: + nvmet_fc_destroy_fcp_iodlist(assoc->tgtport, queue); + destroy_workqueue(queue->work_q); +out_a_put: + nvmet_fc_tgt_a_put(assoc); +out_free_queue: + kfree(queue); + return NULL; +} + + +static void +nvmet_fc_tgt_queue_free(struct kref *ref) +{ + struct nvmet_fc_tgt_queue *queue = + container_of(ref, struct nvmet_fc_tgt_queue, ref); + unsigned long flags; + + spin_lock_irqsave(&queue->assoc->tgtport->lock, flags); + queue->assoc->queues[queue->qid] = NULL; + spin_unlock_irqrestore(&queue->assoc->tgtport->lock, flags); + + nvmet_fc_destroy_fcp_iodlist(queue->assoc->tgtport, queue); + + nvmet_fc_tgt_a_put(queue->assoc); + + destroy_workqueue(queue->work_q); + + kfree(queue); +} + +static void +nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue) +{ + kref_put(&queue->ref, nvmet_fc_tgt_queue_free); +} + +static int +nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue) +{ + return kref_get_unless_zero(&queue->ref); +} + + +static void +nvmet_fc_delete_target_queue(struct nvmet_fc_tgt_queue *queue) +{ + struct nvmet_fc_tgtport *tgtport = queue->assoc->tgtport; + struct nvmet_fc_fcp_iod *fod = queue->fod; + struct nvmet_fc_defer_fcp_req *deferfcp, *tempptr; + unsigned long flags; + int i, writedataactive; + bool disconnect; + + disconnect = atomic_xchg(&queue->connected, 0); + + spin_lock_irqsave(&queue->qlock, flags); + /* about outstanding io's */ + for (i = 0; i < queue->sqsize; fod++, i++) { + if (fod->active) { + spin_lock(&fod->flock); + fod->abort = true; + writedataactive = fod->writedataactive; + spin_unlock(&fod->flock); + /* + * only call lldd abort routine if waiting for + * writedata. other outstanding ops should finish + * on their own. + */ + if (writedataactive) { + spin_lock(&fod->flock); + fod->aborted = true; + spin_unlock(&fod->flock); + tgtport->ops->fcp_abort( + &tgtport->fc_target_port, fod->fcpreq); + } + } + } + + /* Cleanup defer'ed IOs in queue */ + list_for_each_entry_safe(deferfcp, tempptr, &queue->avail_defer_list, + req_list) { + list_del(&deferfcp->req_list); + kfree(deferfcp); + } + + for (;;) { + deferfcp = list_first_entry_or_null(&queue->pending_cmd_list, + struct nvmet_fc_defer_fcp_req, req_list); + if (!deferfcp) + break; + + list_del(&deferfcp->req_list); + spin_unlock_irqrestore(&queue->qlock, flags); + + tgtport->ops->defer_rcv(&tgtport->fc_target_port, + deferfcp->fcp_req); + + tgtport->ops->fcp_abort(&tgtport->fc_target_port, + deferfcp->fcp_req); + + tgtport->ops->fcp_req_release(&tgtport->fc_target_port, + deferfcp->fcp_req); + + /* release the queue lookup reference */ + nvmet_fc_tgt_q_put(queue); + + kfree(deferfcp); + + spin_lock_irqsave(&queue->qlock, flags); + } + spin_unlock_irqrestore(&queue->qlock, flags); + + flush_workqueue(queue->work_q); + + if (disconnect) + nvmet_sq_destroy(&queue->nvme_sq); + + nvmet_fc_tgt_q_put(queue); +} + +static struct nvmet_fc_tgt_queue * +nvmet_fc_find_target_queue(struct nvmet_fc_tgtport *tgtport, + u64 connection_id) +{ + struct nvmet_fc_tgt_assoc *assoc; + struct nvmet_fc_tgt_queue *queue; + u64 association_id = nvmet_fc_getassociationid(connection_id); + u16 qid = nvmet_fc_getqueueid(connection_id); + unsigned long flags; + + if (qid > NVMET_NR_QUEUES) + return NULL; + + spin_lock_irqsave(&tgtport->lock, flags); + list_for_each_entry(assoc, &tgtport->assoc_list, a_list) { + if (association_id == assoc->association_id) { + queue = assoc->queues[qid]; + if (queue && + (!atomic_read(&queue->connected) || + !nvmet_fc_tgt_q_get(queue))) + queue = NULL; + spin_unlock_irqrestore(&tgtport->lock, flags); + return queue; + } + } + spin_unlock_irqrestore(&tgtport->lock, flags); + return NULL; +} + +static void +nvmet_fc_delete_assoc(struct work_struct *work) +{ + struct nvmet_fc_tgt_assoc *assoc = + container_of(work, struct nvmet_fc_tgt_assoc, del_work); + + nvmet_fc_delete_target_assoc(assoc); + nvmet_fc_tgt_a_put(assoc); +} + +static struct nvmet_fc_tgt_assoc * +nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport) +{ + struct nvmet_fc_tgt_assoc *assoc, *tmpassoc; + unsigned long flags; + u64 ran; + int idx; + bool needrandom = true; + + assoc = kzalloc(sizeof(*assoc), GFP_KERNEL); + if (!assoc) + return NULL; + + idx = ida_simple_get(&tgtport->assoc_cnt, 0, 0, GFP_KERNEL); + if (idx < 0) + goto out_free_assoc; + + if (!nvmet_fc_tgtport_get(tgtport)) + goto out_ida_put; + + assoc->tgtport = tgtport; + assoc->a_id = idx; + INIT_LIST_HEAD(&assoc->a_list); + kref_init(&assoc->ref); + INIT_WORK(&assoc->del_work, nvmet_fc_delete_assoc); + + while (needrandom) { + get_random_bytes(&ran, sizeof(ran) - BYTES_FOR_QID); + ran = ran << BYTES_FOR_QID_SHIFT; + + spin_lock_irqsave(&tgtport->lock, flags); + needrandom = false; + list_for_each_entry(tmpassoc, &tgtport->assoc_list, a_list) + if (ran == tmpassoc->association_id) { + needrandom = true; + break; + } + if (!needrandom) { + assoc->association_id = ran; + list_add_tail(&assoc->a_list, &tgtport->assoc_list); + } + spin_unlock_irqrestore(&tgtport->lock, flags); + } + + return assoc; + +out_ida_put: + ida_simple_remove(&tgtport->assoc_cnt, idx); +out_free_assoc: + kfree(assoc); + return NULL; +} + +static void +nvmet_fc_target_assoc_free(struct kref *ref) +{ + struct nvmet_fc_tgt_assoc *assoc = + container_of(ref, struct nvmet_fc_tgt_assoc, ref); + struct nvmet_fc_tgtport *tgtport = assoc->tgtport; + unsigned long flags; + + spin_lock_irqsave(&tgtport->lock, flags); + list_del(&assoc->a_list); + spin_unlock_irqrestore(&tgtport->lock, flags); + ida_simple_remove(&tgtport->assoc_cnt, assoc->a_id); + kfree(assoc); + nvmet_fc_tgtport_put(tgtport); +} + +static void +nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc) +{ + kref_put(&assoc->ref, nvmet_fc_target_assoc_free); +} + +static int +nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc) +{ + return kref_get_unless_zero(&assoc->ref); +} + +static void +nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc) +{ + struct nvmet_fc_tgtport *tgtport = assoc->tgtport; + struct nvmet_fc_tgt_queue *queue; + unsigned long flags; + int i; + + spin_lock_irqsave(&tgtport->lock, flags); + for (i = NVMET_NR_QUEUES; i >= 0; i--) { + queue = assoc->queues[i]; + if (queue) { + if (!nvmet_fc_tgt_q_get(queue)) + continue; + spin_unlock_irqrestore(&tgtport->lock, flags); + nvmet_fc_delete_target_queue(queue); + nvmet_fc_tgt_q_put(queue); + spin_lock_irqsave(&tgtport->lock, flags); + } + } + spin_unlock_irqrestore(&tgtport->lock, flags); + + nvmet_fc_tgt_a_put(assoc); +} + +static struct nvmet_fc_tgt_assoc * +nvmet_fc_find_target_assoc(struct nvmet_fc_tgtport *tgtport, + u64 association_id) +{ + struct nvmet_fc_tgt_assoc *assoc; + struct nvmet_fc_tgt_assoc *ret = NULL; + unsigned long flags; + + spin_lock_irqsave(&tgtport->lock, flags); + list_for_each_entry(assoc, &tgtport->assoc_list, a_list) { + if (association_id == assoc->association_id) { + ret = assoc; + nvmet_fc_tgt_a_get(assoc); + break; + } + } + spin_unlock_irqrestore(&tgtport->lock, flags); + + return ret; +} + + +/** + * nvme_fc_register_targetport - transport entry point called by an + * LLDD to register the existence of a local + * NVME subystem FC port. + * @pinfo: pointer to information about the port to be registered + * @template: LLDD entrypoints and operational parameters for the port + * @dev: physical hardware device node port corresponds to. Will be + * used for DMA mappings + * @portptr: pointer to a local port pointer. Upon success, the routine + * will allocate a nvme_fc_local_port structure and place its + * address in the local port pointer. Upon failure, local port + * pointer will be set to NULL. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo, + struct nvmet_fc_target_template *template, + struct device *dev, + struct nvmet_fc_target_port **portptr) +{ + struct nvmet_fc_tgtport *newrec; + unsigned long flags; + int ret, idx; + + if (!template->xmt_ls_rsp || !template->fcp_op || + !template->fcp_abort || + !template->fcp_req_release || !template->targetport_delete || + !template->max_hw_queues || !template->max_sgl_segments || + !template->max_dif_sgl_segments || !template->dma_boundary) { + ret = -EINVAL; + goto out_regtgt_failed; + } + + newrec = kzalloc((sizeof(*newrec) + template->target_priv_sz), + GFP_KERNEL); + if (!newrec) { + ret = -ENOMEM; + goto out_regtgt_failed; + } + + idx = ida_simple_get(&nvmet_fc_tgtport_cnt, 0, 0, GFP_KERNEL); + if (idx < 0) { + ret = -ENOSPC; + goto out_fail_kfree; + } + + if (!get_device(dev) && dev) { + ret = -ENODEV; + goto out_ida_put; + } + + newrec->fc_target_port.node_name = pinfo->node_name; + newrec->fc_target_port.port_name = pinfo->port_name; + newrec->fc_target_port.private = &newrec[1]; + newrec->fc_target_port.port_id = pinfo->port_id; + newrec->fc_target_port.port_num = idx; + INIT_LIST_HEAD(&newrec->tgt_list); + newrec->dev = dev; + newrec->ops = template; + spin_lock_init(&newrec->lock); + INIT_LIST_HEAD(&newrec->ls_list); + INIT_LIST_HEAD(&newrec->ls_busylist); + INIT_LIST_HEAD(&newrec->assoc_list); + kref_init(&newrec->ref); + ida_init(&newrec->assoc_cnt); + newrec->max_sg_cnt = template->max_sgl_segments; + + ret = nvmet_fc_alloc_ls_iodlist(newrec); + if (ret) { + ret = -ENOMEM; + goto out_free_newrec; + } + + spin_lock_irqsave(&nvmet_fc_tgtlock, flags); + list_add_tail(&newrec->tgt_list, &nvmet_fc_target_list); + spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); + + *portptr = &newrec->fc_target_port; + return 0; + +out_free_newrec: + put_device(dev); +out_ida_put: + ida_simple_remove(&nvmet_fc_tgtport_cnt, idx); +out_fail_kfree: + kfree(newrec); +out_regtgt_failed: + *portptr = NULL; + return ret; +} +EXPORT_SYMBOL_GPL(nvmet_fc_register_targetport); + + +static void +nvmet_fc_free_tgtport(struct kref *ref) +{ + struct nvmet_fc_tgtport *tgtport = + container_of(ref, struct nvmet_fc_tgtport, ref); + struct device *dev = tgtport->dev; + unsigned long flags; + + spin_lock_irqsave(&nvmet_fc_tgtlock, flags); + list_del(&tgtport->tgt_list); + spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); + + nvmet_fc_free_ls_iodlist(tgtport); + + /* let the LLDD know we've finished tearing it down */ + tgtport->ops->targetport_delete(&tgtport->fc_target_port); + + ida_simple_remove(&nvmet_fc_tgtport_cnt, + tgtport->fc_target_port.port_num); + + ida_destroy(&tgtport->assoc_cnt); + + kfree(tgtport); + + put_device(dev); +} + +static void +nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport) +{ + kref_put(&tgtport->ref, nvmet_fc_free_tgtport); +} + +static int +nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport) +{ + return kref_get_unless_zero(&tgtport->ref); +} + +static void +__nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport) +{ + struct nvmet_fc_tgt_assoc *assoc, *next; + unsigned long flags; + + spin_lock_irqsave(&tgtport->lock, flags); + list_for_each_entry_safe(assoc, next, + &tgtport->assoc_list, a_list) { + if (!nvmet_fc_tgt_a_get(assoc)) + continue; + spin_unlock_irqrestore(&tgtport->lock, flags); + nvmet_fc_delete_target_assoc(assoc); + nvmet_fc_tgt_a_put(assoc); + spin_lock_irqsave(&tgtport->lock, flags); + } + spin_unlock_irqrestore(&tgtport->lock, flags); +} + +/* + * nvmet layer has called to terminate an association + */ +static void +nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl) +{ + struct nvmet_fc_tgtport *tgtport, *next; + struct nvmet_fc_tgt_assoc *assoc; + struct nvmet_fc_tgt_queue *queue; + unsigned long flags; + bool found_ctrl = false; + + /* this is a bit ugly, but don't want to make locks layered */ + spin_lock_irqsave(&nvmet_fc_tgtlock, flags); + list_for_each_entry_safe(tgtport, next, &nvmet_fc_target_list, + tgt_list) { + if (!nvmet_fc_tgtport_get(tgtport)) + continue; + spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); + + spin_lock_irqsave(&tgtport->lock, flags); + list_for_each_entry(assoc, &tgtport->assoc_list, a_list) { + queue = assoc->queues[0]; + if (queue && queue->nvme_sq.ctrl == ctrl) { + if (nvmet_fc_tgt_a_get(assoc)) + found_ctrl = true; + break; + } + } + spin_unlock_irqrestore(&tgtport->lock, flags); + + nvmet_fc_tgtport_put(tgtport); + + if (found_ctrl) { + schedule_work(&assoc->del_work); + return; + } + + spin_lock_irqsave(&nvmet_fc_tgtlock, flags); + } + spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); +} + +/** + * nvme_fc_unregister_targetport - transport entry point called by an + * LLDD to deregister/remove a previously + * registered a local NVME subsystem FC port. + * @tgtport: pointer to the (registered) target port that is to be + * deregistered. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *target_port) +{ + struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); + + /* terminate any outstanding associations */ + __nvmet_fc_free_assocs(tgtport); + + nvmet_fc_tgtport_put(tgtport); + + return 0; +} +EXPORT_SYMBOL_GPL(nvmet_fc_unregister_targetport); + + +/* *********************** FC-NVME LS Handling **************************** */ + + +static void +nvmet_fc_format_rsp_hdr(void *buf, u8 ls_cmd, __be32 desc_len, u8 rqst_ls_cmd) +{ + struct fcnvme_ls_acc_hdr *acc = buf; + + acc->w0.ls_cmd = ls_cmd; + acc->desc_list_len = desc_len; + acc->rqst.desc_tag = cpu_to_be32(FCNVME_LSDESC_RQST); + acc->rqst.desc_len = + fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst)); + acc->rqst.w0.ls_cmd = rqst_ls_cmd; +} + +static int +nvmet_fc_format_rjt(void *buf, u16 buflen, u8 ls_cmd, + u8 reason, u8 explanation, u8 vendor) +{ + struct fcnvme_ls_rjt *rjt = buf; + + nvmet_fc_format_rsp_hdr(buf, FCNVME_LSDESC_RQST, + fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_rjt)), + ls_cmd); + rjt->rjt.desc_tag = cpu_to_be32(FCNVME_LSDESC_RJT); + rjt->rjt.desc_len = fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rjt)); + rjt->rjt.reason_code = reason; + rjt->rjt.reason_explanation = explanation; + rjt->rjt.vendor = vendor; + + return sizeof(struct fcnvme_ls_rjt); +} + +/* Validation Error indexes into the string table below */ +enum { + VERR_NO_ERROR = 0, + VERR_CR_ASSOC_LEN = 1, + VERR_CR_ASSOC_RQST_LEN = 2, + VERR_CR_ASSOC_CMD = 3, + VERR_CR_ASSOC_CMD_LEN = 4, + VERR_ERSP_RATIO = 5, + VERR_ASSOC_ALLOC_FAIL = 6, + VERR_QUEUE_ALLOC_FAIL = 7, + VERR_CR_CONN_LEN = 8, + VERR_CR_CONN_RQST_LEN = 9, + VERR_ASSOC_ID = 10, + VERR_ASSOC_ID_LEN = 11, + VERR_NO_ASSOC = 12, + VERR_CONN_ID = 13, + VERR_CONN_ID_LEN = 14, + VERR_NO_CONN = 15, + VERR_CR_CONN_CMD = 16, + VERR_CR_CONN_CMD_LEN = 17, + VERR_DISCONN_LEN = 18, + VERR_DISCONN_RQST_LEN = 19, + VERR_DISCONN_CMD = 20, + VERR_DISCONN_CMD_LEN = 21, + VERR_DISCONN_SCOPE = 22, + VERR_RS_LEN = 23, + VERR_RS_RQST_LEN = 24, + VERR_RS_CMD = 25, + VERR_RS_CMD_LEN = 26, + VERR_RS_RCTL = 27, + VERR_RS_RO = 28, +}; + +static char *validation_errors[] = { + "OK", + "Bad CR_ASSOC Length", + "Bad CR_ASSOC Rqst Length", + "Not CR_ASSOC Cmd", + "Bad CR_ASSOC Cmd Length", + "Bad Ersp Ratio", + "Association Allocation Failed", + "Queue Allocation Failed", + "Bad CR_CONN Length", + "Bad CR_CONN Rqst Length", + "Not Association ID", + "Bad Association ID Length", + "No Association", + "Not Connection ID", + "Bad Connection ID Length", + "No Connection", + "Not CR_CONN Cmd", + "Bad CR_CONN Cmd Length", + "Bad DISCONN Length", + "Bad DISCONN Rqst Length", + "Not DISCONN Cmd", + "Bad DISCONN Cmd Length", + "Bad Disconnect Scope", + "Bad RS Length", + "Bad RS Rqst Length", + "Not RS Cmd", + "Bad RS Cmd Length", + "Bad RS R_CTL", + "Bad RS Relative Offset", +}; + +static void +nvmet_fc_ls_create_association(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_ls_iod *iod) +{ + struct fcnvme_ls_cr_assoc_rqst *rqst = + (struct fcnvme_ls_cr_assoc_rqst *)iod->rqstbuf; + struct fcnvme_ls_cr_assoc_acc *acc = + (struct fcnvme_ls_cr_assoc_acc *)iod->rspbuf; + struct nvmet_fc_tgt_queue *queue; + int ret = 0; + + memset(acc, 0, sizeof(*acc)); + + /* + * FC-NVME spec changes. There are initiators sending different + * lengths as padding sizes for Create Association Cmd descriptor + * was incorrect. + * Accept anything of "minimum" length. Assume format per 1.15 + * spec (with HOSTID reduced to 16 bytes), ignore how long the + * trailing pad length is. + */ + if (iod->rqstdatalen < FCNVME_LSDESC_CRA_RQST_MINLEN) + ret = VERR_CR_ASSOC_LEN; + else if (be32_to_cpu(rqst->desc_list_len) < + FCNVME_LSDESC_CRA_RQST_MIN_LISTLEN) + ret = VERR_CR_ASSOC_RQST_LEN; + else if (rqst->assoc_cmd.desc_tag != + cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD)) + ret = VERR_CR_ASSOC_CMD; + else if (be32_to_cpu(rqst->assoc_cmd.desc_len) < + FCNVME_LSDESC_CRA_CMD_DESC_MIN_DESCLEN) + ret = VERR_CR_ASSOC_CMD_LEN; + else if (!rqst->assoc_cmd.ersp_ratio || + (be16_to_cpu(rqst->assoc_cmd.ersp_ratio) >= + be16_to_cpu(rqst->assoc_cmd.sqsize))) + ret = VERR_ERSP_RATIO; + + else { + /* new association w/ admin queue */ + iod->assoc = nvmet_fc_alloc_target_assoc(tgtport); + if (!iod->assoc) + ret = VERR_ASSOC_ALLOC_FAIL; + else { + queue = nvmet_fc_alloc_target_queue(iod->assoc, 0, + be16_to_cpu(rqst->assoc_cmd.sqsize)); + if (!queue) + ret = VERR_QUEUE_ALLOC_FAIL; + } + } + + if (ret) { + dev_err(tgtport->dev, + "Create Association LS failed: %s\n", + validation_errors[ret]); + iod->lsreq->rsplen = nvmet_fc_format_rjt(acc, + NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd, + FCNVME_RJT_RC_LOGIC, + FCNVME_RJT_EXP_NONE, 0); + return; + } + + queue->ersp_ratio = be16_to_cpu(rqst->assoc_cmd.ersp_ratio); + atomic_set(&queue->connected, 1); + queue->sqhd = 0; /* best place to init value */ + + /* format a response */ + + iod->lsreq->rsplen = sizeof(*acc); + + nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, + fcnvme_lsdesc_len( + sizeof(struct fcnvme_ls_cr_assoc_acc)), + FCNVME_LS_CREATE_ASSOCIATION); + acc->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); + acc->associd.desc_len = + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_assoc_id)); + acc->associd.association_id = + cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, 0)); + acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID); + acc->connectid.desc_len = + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_conn_id)); + acc->connectid.connection_id = acc->associd.association_id; +} + +static void +nvmet_fc_ls_create_connection(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_ls_iod *iod) +{ + struct fcnvme_ls_cr_conn_rqst *rqst = + (struct fcnvme_ls_cr_conn_rqst *)iod->rqstbuf; + struct fcnvme_ls_cr_conn_acc *acc = + (struct fcnvme_ls_cr_conn_acc *)iod->rspbuf; + struct nvmet_fc_tgt_queue *queue; + int ret = 0; + + memset(acc, 0, sizeof(*acc)); + + if (iod->rqstdatalen < sizeof(struct fcnvme_ls_cr_conn_rqst)) + ret = VERR_CR_CONN_LEN; + else if (rqst->desc_list_len != + fcnvme_lsdesc_len( + sizeof(struct fcnvme_ls_cr_conn_rqst))) + ret = VERR_CR_CONN_RQST_LEN; + else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) + ret = VERR_ASSOC_ID; + else if (rqst->associd.desc_len != + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_assoc_id))) + ret = VERR_ASSOC_ID_LEN; + else if (rqst->connect_cmd.desc_tag != + cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD)) + ret = VERR_CR_CONN_CMD; + else if (rqst->connect_cmd.desc_len != + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_cr_conn_cmd))) + ret = VERR_CR_CONN_CMD_LEN; + else if (!rqst->connect_cmd.ersp_ratio || + (be16_to_cpu(rqst->connect_cmd.ersp_ratio) >= + be16_to_cpu(rqst->connect_cmd.sqsize))) + ret = VERR_ERSP_RATIO; + + else { + /* new io queue */ + iod->assoc = nvmet_fc_find_target_assoc(tgtport, + be64_to_cpu(rqst->associd.association_id)); + if (!iod->assoc) + ret = VERR_NO_ASSOC; + else { + queue = nvmet_fc_alloc_target_queue(iod->assoc, + be16_to_cpu(rqst->connect_cmd.qid), + be16_to_cpu(rqst->connect_cmd.sqsize)); + if (!queue) + ret = VERR_QUEUE_ALLOC_FAIL; + + /* release get taken in nvmet_fc_find_target_assoc */ + nvmet_fc_tgt_a_put(iod->assoc); + } + } + + if (ret) { + dev_err(tgtport->dev, + "Create Connection LS failed: %s\n", + validation_errors[ret]); + iod->lsreq->rsplen = nvmet_fc_format_rjt(acc, + NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd, + (ret == VERR_NO_ASSOC) ? + FCNVME_RJT_RC_INV_ASSOC : + FCNVME_RJT_RC_LOGIC, + FCNVME_RJT_EXP_NONE, 0); + return; + } + + queue->ersp_ratio = be16_to_cpu(rqst->connect_cmd.ersp_ratio); + atomic_set(&queue->connected, 1); + queue->sqhd = 0; /* best place to init value */ + + /* format a response */ + + iod->lsreq->rsplen = sizeof(*acc); + + nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, + fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc)), + FCNVME_LS_CREATE_CONNECTION); + acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID); + acc->connectid.desc_len = + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_conn_id)); + acc->connectid.connection_id = + cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, + be16_to_cpu(rqst->connect_cmd.qid))); +} + +static void +nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_ls_iod *iod) +{ + struct fcnvme_ls_disconnect_rqst *rqst = + (struct fcnvme_ls_disconnect_rqst *)iod->rqstbuf; + struct fcnvme_ls_disconnect_acc *acc = + (struct fcnvme_ls_disconnect_acc *)iod->rspbuf; + struct nvmet_fc_tgt_queue *queue = NULL; + struct nvmet_fc_tgt_assoc *assoc; + int ret = 0; + bool del_assoc = false; + + memset(acc, 0, sizeof(*acc)); + + if (iod->rqstdatalen < sizeof(struct fcnvme_ls_disconnect_rqst)) + ret = VERR_DISCONN_LEN; + else if (rqst->desc_list_len != + fcnvme_lsdesc_len( + sizeof(struct fcnvme_ls_disconnect_rqst))) + ret = VERR_DISCONN_RQST_LEN; + else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) + ret = VERR_ASSOC_ID; + else if (rqst->associd.desc_len != + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_assoc_id))) + ret = VERR_ASSOC_ID_LEN; + else if (rqst->discon_cmd.desc_tag != + cpu_to_be32(FCNVME_LSDESC_DISCONN_CMD)) + ret = VERR_DISCONN_CMD; + else if (rqst->discon_cmd.desc_len != + fcnvme_lsdesc_len( + sizeof(struct fcnvme_lsdesc_disconn_cmd))) + ret = VERR_DISCONN_CMD_LEN; + else if ((rqst->discon_cmd.scope != FCNVME_DISCONN_ASSOCIATION) && + (rqst->discon_cmd.scope != FCNVME_DISCONN_CONNECTION)) + ret = VERR_DISCONN_SCOPE; + else { + /* match an active association */ + assoc = nvmet_fc_find_target_assoc(tgtport, + be64_to_cpu(rqst->associd.association_id)); + iod->assoc = assoc; + if (assoc) { + if (rqst->discon_cmd.scope == + FCNVME_DISCONN_CONNECTION) { + queue = nvmet_fc_find_target_queue(tgtport, + be64_to_cpu( + rqst->discon_cmd.id)); + if (!queue) { + nvmet_fc_tgt_a_put(assoc); + ret = VERR_NO_CONN; + } + } + } else + ret = VERR_NO_ASSOC; + } + + if (ret) { + dev_err(tgtport->dev, + "Disconnect LS failed: %s\n", + validation_errors[ret]); + iod->lsreq->rsplen = nvmet_fc_format_rjt(acc, + NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd, + (ret == VERR_NO_ASSOC) ? + FCNVME_RJT_RC_INV_ASSOC : + (ret == VERR_NO_CONN) ? + FCNVME_RJT_RC_INV_CONN : + FCNVME_RJT_RC_LOGIC, + FCNVME_RJT_EXP_NONE, 0); + return; + } + + /* format a response */ + + iod->lsreq->rsplen = sizeof(*acc); + + nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, + fcnvme_lsdesc_len( + sizeof(struct fcnvme_ls_disconnect_acc)), + FCNVME_LS_DISCONNECT); + + + /* are we to delete a Connection ID (queue) */ + if (queue) { + int qid = queue->qid; + + nvmet_fc_delete_target_queue(queue); + + /* release the get taken by find_target_queue */ + nvmet_fc_tgt_q_put(queue); + + /* tear association down if io queue terminated */ + if (!qid) + del_assoc = true; + } + + /* release get taken in nvmet_fc_find_target_assoc */ + nvmet_fc_tgt_a_put(iod->assoc); + + if (del_assoc) + nvmet_fc_delete_target_assoc(iod->assoc); +} + + +/* *********************** NVME Ctrl Routines **************************** */ + + +static void nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req); + +static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops; + +static void +nvmet_fc_xmt_ls_rsp_done(struct nvmefc_tgt_ls_req *lsreq) +{ + struct nvmet_fc_ls_iod *iod = lsreq->nvmet_fc_private; + struct nvmet_fc_tgtport *tgtport = iod->tgtport; + + fc_dma_sync_single_for_cpu(tgtport->dev, iod->rspdma, + NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE); + nvmet_fc_free_ls_iod(tgtport, iod); + nvmet_fc_tgtport_put(tgtport); +} + +static void +nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_ls_iod *iod) +{ + int ret; + + fc_dma_sync_single_for_device(tgtport->dev, iod->rspdma, + NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE); + + ret = tgtport->ops->xmt_ls_rsp(&tgtport->fc_target_port, iod->lsreq); + if (ret) + nvmet_fc_xmt_ls_rsp_done(iod->lsreq); +} + +/* + * Actual processing routine for received FC-NVME LS Requests from the LLD + */ +static void +nvmet_fc_handle_ls_rqst(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_ls_iod *iod) +{ + struct fcnvme_ls_rqst_w0 *w0 = + (struct fcnvme_ls_rqst_w0 *)iod->rqstbuf; + + iod->lsreq->nvmet_fc_private = iod; + iod->lsreq->rspbuf = iod->rspbuf; + iod->lsreq->rspdma = iod->rspdma; + iod->lsreq->done = nvmet_fc_xmt_ls_rsp_done; + /* Be preventative. handlers will later set to valid length */ + iod->lsreq->rsplen = 0; + + iod->assoc = NULL; + + /* + * handlers: + * parse request input, execute the request, and format the + * LS response + */ + switch (w0->ls_cmd) { + case FCNVME_LS_CREATE_ASSOCIATION: + /* Creates Association and initial Admin Queue/Connection */ + nvmet_fc_ls_create_association(tgtport, iod); + break; + case FCNVME_LS_CREATE_CONNECTION: + /* Creates an IO Queue/Connection */ + nvmet_fc_ls_create_connection(tgtport, iod); + break; + case FCNVME_LS_DISCONNECT: + /* Terminate a Queue/Connection or the Association */ + nvmet_fc_ls_disconnect(tgtport, iod); + break; + default: + iod->lsreq->rsplen = nvmet_fc_format_rjt(iod->rspbuf, + NVME_FC_MAX_LS_BUFFER_SIZE, w0->ls_cmd, + FCNVME_RJT_RC_INVAL, FCNVME_RJT_EXP_NONE, 0); + } + + nvmet_fc_xmt_ls_rsp(tgtport, iod); +} + +/* + * Actual processing routine for received FC-NVME LS Requests from the LLD + */ +static void +nvmet_fc_handle_ls_rqst_work(struct work_struct *work) +{ + struct nvmet_fc_ls_iod *iod = + container_of(work, struct nvmet_fc_ls_iod, work); + struct nvmet_fc_tgtport *tgtport = iod->tgtport; + + nvmet_fc_handle_ls_rqst(tgtport, iod); +} + + +/** + * nvmet_fc_rcv_ls_req - transport entry point called by an LLDD + * upon the reception of a NVME LS request. + * + * The nvmet-fc layer will copy payload to an internal structure for + * processing. As such, upon completion of the routine, the LLDD may + * immediately free/reuse the LS request buffer passed in the call. + * + * If this routine returns error, the LLDD should abort the exchange. + * + * @tgtport: pointer to the (registered) target port the LS was + * received on. + * @lsreq: pointer to a lsreq request structure to be used to reference + * the exchange corresponding to the LS. + * @lsreqbuf: pointer to the buffer containing the LS Request + * @lsreqbuf_len: length, in bytes, of the received LS request + */ +int +nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *target_port, + struct nvmefc_tgt_ls_req *lsreq, + void *lsreqbuf, u32 lsreqbuf_len) +{ + struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); + struct nvmet_fc_ls_iod *iod; + + if (lsreqbuf_len > NVME_FC_MAX_LS_BUFFER_SIZE) + return -E2BIG; + + if (!nvmet_fc_tgtport_get(tgtport)) + return -ESHUTDOWN; + + iod = nvmet_fc_alloc_ls_iod(tgtport); + if (!iod) { + nvmet_fc_tgtport_put(tgtport); + return -ENOENT; + } + + iod->lsreq = lsreq; + iod->fcpreq = NULL; + memcpy(iod->rqstbuf, lsreqbuf, lsreqbuf_len); + iod->rqstdatalen = lsreqbuf_len; + + schedule_work(&iod->work); + + return 0; +} +EXPORT_SYMBOL_GPL(nvmet_fc_rcv_ls_req); + + +/* + * ********************** + * Start of FCP handling + * ********************** + */ + +static int +nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod) +{ + struct scatterlist *sg; + unsigned int nent; + + sg = sgl_alloc(fod->req.transfer_len, GFP_KERNEL, &nent); + if (!sg) + goto out; + + fod->data_sg = sg; + fod->data_sg_cnt = nent; + fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent, + ((fod->io_dir == NVMET_FCP_WRITE) ? + DMA_FROM_DEVICE : DMA_TO_DEVICE)); + /* note: write from initiator perspective */ + fod->next_sg = fod->data_sg; + + return 0; + +out: + return NVME_SC_INTERNAL; +} + +static void +nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod) +{ + if (!fod->data_sg || !fod->data_sg_cnt) + return; + + fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt, + ((fod->io_dir == NVMET_FCP_WRITE) ? + DMA_FROM_DEVICE : DMA_TO_DEVICE)); + sgl_free(fod->data_sg); + fod->data_sg = NULL; + fod->data_sg_cnt = 0; +} + + +static bool +queue_90percent_full(struct nvmet_fc_tgt_queue *q, u32 sqhd) +{ + u32 sqtail, used; + + /* egad, this is ugly. And sqtail is just a best guess */ + sqtail = atomic_read(&q->sqtail) % q->sqsize; + + used = (sqtail < sqhd) ? (sqtail + q->sqsize - sqhd) : (sqtail - sqhd); + return ((used * 10) >= (((u32)(q->sqsize - 1) * 9))); +} + +/* + * Prep RSP payload. + * May be a NVMET_FCOP_RSP or NVMET_FCOP_READDATA_RSP op + */ +static void +nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_fcp_iod *fod) +{ + struct nvme_fc_ersp_iu *ersp = &fod->rspiubuf; + struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common; + struct nvme_completion *cqe = &ersp->cqe; + u32 *cqewd = (u32 *)cqe; + bool send_ersp = false; + u32 rsn, rspcnt, xfr_length; + + if (fod->fcpreq->op == NVMET_FCOP_READDATA_RSP) + xfr_length = fod->req.transfer_len; + else + xfr_length = fod->offset; + + /* + * check to see if we can send a 0's rsp. + * Note: to send a 0's response, the NVME-FC host transport will + * recreate the CQE. The host transport knows: sq id, SQHD (last + * seen in an ersp), and command_id. Thus it will create a + * zero-filled CQE with those known fields filled in. Transport + * must send an ersp for any condition where the cqe won't match + * this. + * + * Here are the FC-NVME mandated cases where we must send an ersp: + * every N responses, where N=ersp_ratio + * force fabric commands to send ersp's (not in FC-NVME but good + * practice) + * normal cmds: any time status is non-zero, or status is zero + * but words 0 or 1 are non-zero. + * the SQ is 90% or more full + * the cmd is a fused command + * transferred data length not equal to cmd iu length + */ + rspcnt = atomic_inc_return(&fod->queue->zrspcnt); + if (!(rspcnt % fod->queue->ersp_ratio) || + sqe->opcode == nvme_fabrics_command || + xfr_length != fod->req.transfer_len || + (le16_to_cpu(cqe->status) & 0xFFFE) || cqewd[0] || cqewd[1] || + (sqe->flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND)) || + queue_90percent_full(fod->queue, le16_to_cpu(cqe->sq_head))) + send_ersp = true; + + /* re-set the fields */ + fod->fcpreq->rspaddr = ersp; + fod->fcpreq->rspdma = fod->rspdma; + + if (!send_ersp) { + memset(ersp, 0, NVME_FC_SIZEOF_ZEROS_RSP); + fod->fcpreq->rsplen = NVME_FC_SIZEOF_ZEROS_RSP; + } else { + ersp->iu_len = cpu_to_be16(sizeof(*ersp)/sizeof(u32)); + rsn = atomic_inc_return(&fod->queue->rsn); + ersp->rsn = cpu_to_be32(rsn); + ersp->xfrd_len = cpu_to_be32(xfr_length); + fod->fcpreq->rsplen = sizeof(*ersp); + } + + fc_dma_sync_single_for_device(tgtport->dev, fod->rspdma, + sizeof(fod->rspiubuf), DMA_TO_DEVICE); +} + +static void nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq); + +static void +nvmet_fc_abort_op(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_fcp_iod *fod) +{ + struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; + + /* data no longer needed */ + nvmet_fc_free_tgt_pgs(fod); + + /* + * if an ABTS was received or we issued the fcp_abort early + * don't call abort routine again. + */ + /* no need to take lock - lock was taken earlier to get here */ + if (!fod->aborted) + tgtport->ops->fcp_abort(&tgtport->fc_target_port, fcpreq); + + nvmet_fc_free_fcp_iod(fod->queue, fod); +} + +static void +nvmet_fc_xmt_fcp_rsp(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_fcp_iod *fod) +{ + int ret; + + fod->fcpreq->op = NVMET_FCOP_RSP; + fod->fcpreq->timeout = 0; + + nvmet_fc_prep_fcp_rsp(tgtport, fod); + + ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq); + if (ret) + nvmet_fc_abort_op(tgtport, fod); +} + +static void +nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_fcp_iod *fod, u8 op) +{ + struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; + struct scatterlist *sg = fod->next_sg; + unsigned long flags; + u32 remaininglen = fod->req.transfer_len - fod->offset; + u32 tlen = 0; + int ret; + + fcpreq->op = op; + fcpreq->offset = fod->offset; + fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC; + + /* + * for next sequence: + * break at a sg element boundary + * attempt to keep sequence length capped at + * NVMET_FC_MAX_SEQ_LENGTH but allow sequence to + * be longer if a single sg element is larger + * than that amount. This is done to avoid creating + * a new sg list to use for the tgtport api. + */ + fcpreq->sg = sg; + fcpreq->sg_cnt = 0; + while (tlen < remaininglen && + fcpreq->sg_cnt < tgtport->max_sg_cnt && + tlen + sg_dma_len(sg) < NVMET_FC_MAX_SEQ_LENGTH) { + fcpreq->sg_cnt++; + tlen += sg_dma_len(sg); + sg = sg_next(sg); + } + if (tlen < remaininglen && fcpreq->sg_cnt == 0) { + fcpreq->sg_cnt++; + tlen += min_t(u32, sg_dma_len(sg), remaininglen); + sg = sg_next(sg); + } + if (tlen < remaininglen) + fod->next_sg = sg; + else + fod->next_sg = NULL; + + fcpreq->transfer_length = tlen; + fcpreq->transferred_length = 0; + fcpreq->fcp_error = 0; + fcpreq->rsplen = 0; + + /* + * If the last READDATA request: check if LLDD supports + * combined xfr with response. + */ + if ((op == NVMET_FCOP_READDATA) && + ((fod->offset + fcpreq->transfer_length) == fod->req.transfer_len) && + (tgtport->ops->target_features & NVMET_FCTGTFEAT_READDATA_RSP)) { + fcpreq->op = NVMET_FCOP_READDATA_RSP; + nvmet_fc_prep_fcp_rsp(tgtport, fod); + } + + ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq); + if (ret) { + /* + * should be ok to set w/o lock as its in the thread of + * execution (not an async timer routine) and doesn't + * contend with any clearing action + */ + fod->abort = true; + + if (op == NVMET_FCOP_WRITEDATA) { + spin_lock_irqsave(&fod->flock, flags); + fod->writedataactive = false; + spin_unlock_irqrestore(&fod->flock, flags); + nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); + } else /* NVMET_FCOP_READDATA or NVMET_FCOP_READDATA_RSP */ { + fcpreq->fcp_error = ret; + fcpreq->transferred_length = 0; + nvmet_fc_xmt_fcp_op_done(fod->fcpreq); + } + } +} + +static inline bool +__nvmet_fc_fod_op_abort(struct nvmet_fc_fcp_iod *fod, bool abort) +{ + struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; + struct nvmet_fc_tgtport *tgtport = fod->tgtport; + + /* if in the middle of an io and we need to tear down */ + if (abort) { + if (fcpreq->op == NVMET_FCOP_WRITEDATA) { + nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); + return true; + } + + nvmet_fc_abort_op(tgtport, fod); + return true; + } + + return false; +} + +/* + * actual done handler for FCP operations when completed by the lldd + */ +static void +nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod) +{ + struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; + struct nvmet_fc_tgtport *tgtport = fod->tgtport; + unsigned long flags; + bool abort; + + spin_lock_irqsave(&fod->flock, flags); + abort = fod->abort; + fod->writedataactive = false; + spin_unlock_irqrestore(&fod->flock, flags); + + switch (fcpreq->op) { + + case NVMET_FCOP_WRITEDATA: + if (__nvmet_fc_fod_op_abort(fod, abort)) + return; + if (fcpreq->fcp_error || + fcpreq->transferred_length != fcpreq->transfer_length) { + spin_lock_irqsave(&fod->flock, flags); + fod->abort = true; + spin_unlock_irqrestore(&fod->flock, flags); + + nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); + return; + } + + fod->offset += fcpreq->transferred_length; + if (fod->offset != fod->req.transfer_len) { + spin_lock_irqsave(&fod->flock, flags); + fod->writedataactive = true; + spin_unlock_irqrestore(&fod->flock, flags); + + /* transfer the next chunk */ + nvmet_fc_transfer_fcp_data(tgtport, fod, + NVMET_FCOP_WRITEDATA); + return; + } + + /* data transfer complete, resume with nvmet layer */ + nvmet_req_execute(&fod->req); + break; + + case NVMET_FCOP_READDATA: + case NVMET_FCOP_READDATA_RSP: + if (__nvmet_fc_fod_op_abort(fod, abort)) + return; + if (fcpreq->fcp_error || + fcpreq->transferred_length != fcpreq->transfer_length) { + nvmet_fc_abort_op(tgtport, fod); + return; + } + + /* success */ + + if (fcpreq->op == NVMET_FCOP_READDATA_RSP) { + /* data no longer needed */ + nvmet_fc_free_tgt_pgs(fod); + nvmet_fc_free_fcp_iod(fod->queue, fod); + return; + } + + fod->offset += fcpreq->transferred_length; + if (fod->offset != fod->req.transfer_len) { + /* transfer the next chunk */ + nvmet_fc_transfer_fcp_data(tgtport, fod, + NVMET_FCOP_READDATA); + return; + } + + /* data transfer complete, send response */ + + /* data no longer needed */ + nvmet_fc_free_tgt_pgs(fod); + + nvmet_fc_xmt_fcp_rsp(tgtport, fod); + + break; + + case NVMET_FCOP_RSP: + if (__nvmet_fc_fod_op_abort(fod, abort)) + return; + nvmet_fc_free_fcp_iod(fod->queue, fod); + break; + + default: + break; + } +} + +static void +nvmet_fc_fcp_rqst_op_done_work(struct work_struct *work) +{ + struct nvmet_fc_fcp_iod *fod = + container_of(work, struct nvmet_fc_fcp_iod, done_work); + + nvmet_fc_fod_op_done(fod); +} + +static void +nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq) +{ + struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; + struct nvmet_fc_tgt_queue *queue = fod->queue; + + if (fod->tgtport->ops->target_features & NVMET_FCTGTFEAT_OPDONE_IN_ISR) + /* context switch so completion is not in ISR context */ + queue_work_on(queue->cpu, queue->work_q, &fod->done_work); + else + nvmet_fc_fod_op_done(fod); +} + +/* + * actual completion handler after execution by the nvmet layer + */ +static void +__nvmet_fc_fcp_nvme_cmd_done(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_fcp_iod *fod, int status) +{ + struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common; + struct nvme_completion *cqe = &fod->rspiubuf.cqe; + unsigned long flags; + bool abort; + + spin_lock_irqsave(&fod->flock, flags); + abort = fod->abort; + spin_unlock_irqrestore(&fod->flock, flags); + + /* if we have a CQE, snoop the last sq_head value */ + if (!status) + fod->queue->sqhd = cqe->sq_head; + + if (abort) { + nvmet_fc_abort_op(tgtport, fod); + return; + } + + /* if an error handling the cmd post initial parsing */ + if (status) { + /* fudge up a failed CQE status for our transport error */ + memset(cqe, 0, sizeof(*cqe)); + cqe->sq_head = fod->queue->sqhd; /* echo last cqe sqhd */ + cqe->sq_id = cpu_to_le16(fod->queue->qid); + cqe->command_id = sqe->command_id; + cqe->status = cpu_to_le16(status); + } else { + + /* + * try to push the data even if the SQE status is non-zero. + * There may be a status where data still was intended to + * be moved + */ + if ((fod->io_dir == NVMET_FCP_READ) && (fod->data_sg_cnt)) { + /* push the data over before sending rsp */ + nvmet_fc_transfer_fcp_data(tgtport, fod, + NVMET_FCOP_READDATA); + return; + } + + /* writes & no data - fall thru */ + } + + /* data no longer needed */ + nvmet_fc_free_tgt_pgs(fod); + + nvmet_fc_xmt_fcp_rsp(tgtport, fod); +} + + +static void +nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req) +{ + struct nvmet_fc_fcp_iod *fod = nvmet_req_to_fod(nvme_req); + struct nvmet_fc_tgtport *tgtport = fod->tgtport; + + __nvmet_fc_fcp_nvme_cmd_done(tgtport, fod, 0); +} + + +/* + * Actual processing routine for received FC-NVME LS Requests from the LLD + */ +static void +nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, + struct nvmet_fc_fcp_iod *fod) +{ + struct nvme_fc_cmd_iu *cmdiu = &fod->cmdiubuf; + u32 xfrlen = be32_to_cpu(cmdiu->data_len); + int ret; + + /* + * Fused commands are currently not supported in the linux + * implementation. + * + * As such, the implementation of the FC transport does not + * look at the fused commands and order delivery to the upper + * layer until we have both based on csn. + */ + + fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done; + + if (cmdiu->flags & FCNVME_CMD_FLAGS_WRITE) { + fod->io_dir = NVMET_FCP_WRITE; + if (!nvme_is_write(&cmdiu->sqe)) + goto transport_error; + } else if (cmdiu->flags & FCNVME_CMD_FLAGS_READ) { + fod->io_dir = NVMET_FCP_READ; + if (nvme_is_write(&cmdiu->sqe)) + goto transport_error; + } else { + fod->io_dir = NVMET_FCP_NODATA; + if (xfrlen) + goto transport_error; + } + + fod->req.cmd = &fod->cmdiubuf.sqe; + fod->req.rsp = &fod->rspiubuf.cqe; + fod->req.port = fod->queue->port; + + /* clear any response payload */ + memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf)); + + fod->data_sg = NULL; + fod->data_sg_cnt = 0; + + ret = nvmet_req_init(&fod->req, + &fod->queue->nvme_cq, + &fod->queue->nvme_sq, + &nvmet_fc_tgt_fcp_ops); + if (!ret) { + /* bad SQE content or invalid ctrl state */ + /* nvmet layer has already called op done to send rsp. */ + return; + } + + fod->req.transfer_len = xfrlen; + + /* keep a running counter of tail position */ + atomic_inc(&fod->queue->sqtail); + + if (fod->req.transfer_len) { + ret = nvmet_fc_alloc_tgt_pgs(fod); + if (ret) { + nvmet_req_complete(&fod->req, ret); + return; + } + } + fod->req.sg = fod->data_sg; + fod->req.sg_cnt = fod->data_sg_cnt; + fod->offset = 0; + + if (fod->io_dir == NVMET_FCP_WRITE) { + /* pull the data over before invoking nvmet layer */ + nvmet_fc_transfer_fcp_data(tgtport, fod, NVMET_FCOP_WRITEDATA); + return; + } + + /* + * Reads or no data: + * + * can invoke the nvmet_layer now. If read data, cmd completion will + * push the data + */ + nvmet_req_execute(&fod->req); + return; + +transport_error: + nvmet_fc_abort_op(tgtport, fod); +} + +/* + * Actual processing routine for received FC-NVME LS Requests from the LLD + */ +static void +nvmet_fc_handle_fcp_rqst_work(struct work_struct *work) +{ + struct nvmet_fc_fcp_iod *fod = + container_of(work, struct nvmet_fc_fcp_iod, work); + struct nvmet_fc_tgtport *tgtport = fod->tgtport; + + nvmet_fc_handle_fcp_rqst(tgtport, fod); +} + +/** + * nvmet_fc_rcv_fcp_req - transport entry point called by an LLDD + * upon the reception of a NVME FCP CMD IU. + * + * Pass a FC-NVME FCP CMD IU received from the FC link to the nvmet-fc + * layer for processing. + * + * The nvmet_fc layer allocates a local job structure (struct + * nvmet_fc_fcp_iod) from the queue for the io and copies the + * CMD IU buffer to the job structure. As such, on a successful + * completion (returns 0), the LLDD may immediately free/reuse + * the CMD IU buffer passed in the call. + * + * However, in some circumstances, due to the packetized nature of FC + * and the api of the FC LLDD which may issue a hw command to send the + * response, but the LLDD may not get the hw completion for that command + * and upcall the nvmet_fc layer before a new command may be + * asynchronously received - its possible for a command to be received + * before the LLDD and nvmet_fc have recycled the job structure. It gives + * the appearance of more commands received than fits in the sq. + * To alleviate this scenario, a temporary queue is maintained in the + * transport for pending LLDD requests waiting for a queue job structure. + * In these "overrun" cases, a temporary queue element is allocated + * the LLDD request and CMD iu buffer information remembered, and the + * routine returns a -EOVERFLOW status. Subsequently, when a queue job + * structure is freed, it is immediately reallocated for anything on the + * pending request list. The LLDDs defer_rcv() callback is called, + * informing the LLDD that it may reuse the CMD IU buffer, and the io + * is then started normally with the transport. + * + * The LLDD, when receiving an -EOVERFLOW completion status, is to treat + * the completion as successful but must not reuse the CMD IU buffer + * until the LLDD's defer_rcv() callback has been called for the + * corresponding struct nvmefc_tgt_fcp_req pointer. + * + * If there is any other condition in which an error occurs, the + * transport will return a non-zero status indicating the error. + * In all cases other than -EOVERFLOW, the transport has not accepted the + * request and the LLDD should abort the exchange. + * + * @target_port: pointer to the (registered) target port the FCP CMD IU + * was received on. + * @fcpreq: pointer to a fcpreq request structure to be used to reference + * the exchange corresponding to the FCP Exchange. + * @cmdiubuf: pointer to the buffer containing the FCP CMD IU + * @cmdiubuf_len: length, in bytes, of the received FCP CMD IU + */ +int +nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *target_port, + struct nvmefc_tgt_fcp_req *fcpreq, + void *cmdiubuf, u32 cmdiubuf_len) +{ + struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); + struct nvme_fc_cmd_iu *cmdiu = cmdiubuf; + struct nvmet_fc_tgt_queue *queue; + struct nvmet_fc_fcp_iod *fod; + struct nvmet_fc_defer_fcp_req *deferfcp; + unsigned long flags; + + /* validate iu, so the connection id can be used to find the queue */ + if ((cmdiubuf_len != sizeof(*cmdiu)) || + (cmdiu->scsi_id != NVME_CMD_SCSI_ID) || + (cmdiu->fc_id != NVME_CMD_FC_ID) || + (be16_to_cpu(cmdiu->iu_len) != (sizeof(*cmdiu)/4))) + return -EIO; + + queue = nvmet_fc_find_target_queue(tgtport, + be64_to_cpu(cmdiu->connection_id)); + if (!queue) + return -ENOTCONN; + + /* + * note: reference taken by find_target_queue + * After successful fod allocation, the fod will inherit the + * ownership of that reference and will remove the reference + * when the fod is freed. + */ + + spin_lock_irqsave(&queue->qlock, flags); + + fod = nvmet_fc_alloc_fcp_iod(queue); + if (fod) { + spin_unlock_irqrestore(&queue->qlock, flags); + + fcpreq->nvmet_fc_private = fod; + fod->fcpreq = fcpreq; + + memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len); + + nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq); + + return 0; + } + + if (!tgtport->ops->defer_rcv) { + spin_unlock_irqrestore(&queue->qlock, flags); + /* release the queue lookup reference */ + nvmet_fc_tgt_q_put(queue); + return -ENOENT; + } + + deferfcp = list_first_entry_or_null(&queue->avail_defer_list, + struct nvmet_fc_defer_fcp_req, req_list); + if (deferfcp) { + /* Just re-use one that was previously allocated */ + list_del(&deferfcp->req_list); + } else { + spin_unlock_irqrestore(&queue->qlock, flags); + + /* Now we need to dynamically allocate one */ + deferfcp = kmalloc(sizeof(*deferfcp), GFP_KERNEL); + if (!deferfcp) { + /* release the queue lookup reference */ + nvmet_fc_tgt_q_put(queue); + return -ENOMEM; + } + spin_lock_irqsave(&queue->qlock, flags); + } + + /* For now, use rspaddr / rsplen to save payload information */ + fcpreq->rspaddr = cmdiubuf; + fcpreq->rsplen = cmdiubuf_len; + deferfcp->fcp_req = fcpreq; + + /* defer processing till a fod becomes available */ + list_add_tail(&deferfcp->req_list, &queue->pending_cmd_list); + + /* NOTE: the queue lookup reference is still valid */ + + spin_unlock_irqrestore(&queue->qlock, flags); + + return -EOVERFLOW; +} +EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_req); + +/** + * nvmet_fc_rcv_fcp_abort - transport entry point called by an LLDD + * upon the reception of an ABTS for a FCP command + * + * Notify the transport that an ABTS has been received for a FCP command + * that had been given to the transport via nvmet_fc_rcv_fcp_req(). The + * LLDD believes the command is still being worked on + * (template_ops->fcp_req_release() has not been called). + * + * The transport will wait for any outstanding work (an op to the LLDD, + * which the lldd should complete with error due to the ABTS; or the + * completion from the nvmet layer of the nvme command), then will + * stop processing and call the nvmet_fc_rcv_fcp_req() callback to + * return the i/o context to the LLDD. The LLDD may send the BA_ACC + * to the ABTS either after return from this function (assuming any + * outstanding op work has been terminated) or upon the callback being + * called. + * + * @target_port: pointer to the (registered) target port the FCP CMD IU + * was received on. + * @fcpreq: pointer to the fcpreq request structure that corresponds + * to the exchange that received the ABTS. + */ +void +nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *target_port, + struct nvmefc_tgt_fcp_req *fcpreq) +{ + struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; + struct nvmet_fc_tgt_queue *queue; + unsigned long flags; + + if (!fod || fod->fcpreq != fcpreq) + /* job appears to have already completed, ignore abort */ + return; + + queue = fod->queue; + + spin_lock_irqsave(&queue->qlock, flags); + if (fod->active) { + /* + * mark as abort. The abort handler, invoked upon completion + * of any work, will detect the aborted status and do the + * callback. + */ + spin_lock(&fod->flock); + fod->abort = true; + fod->aborted = true; + spin_unlock(&fod->flock); + } + spin_unlock_irqrestore(&queue->qlock, flags); +} +EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_abort); + + +struct nvmet_fc_traddr { + u64 nn; + u64 pn; +}; + +static int +__nvme_fc_parse_u64(substring_t *sstr, u64 *val) +{ + u64 token64; + + if (match_u64(sstr, &token64)) + return -EINVAL; + *val = token64; + + return 0; +} + +/* + * This routine validates and extracts the WWN's from the TRADDR string. + * As kernel parsers need the 0x to determine number base, universally + * build string to parse with 0x prefix before parsing name strings. + */ +static int +nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen) +{ + char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1]; + substring_t wwn = { name, &name[sizeof(name)-1] }; + int nnoffset, pnoffset; + + /* validate it string one of the 2 allowed formats */ + if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH && + !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) && + !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET], + "pn-0x", NVME_FC_TRADDR_OXNNLEN)) { + nnoffset = NVME_FC_TRADDR_OXNNLEN; + pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET + + NVME_FC_TRADDR_OXNNLEN; + } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH && + !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) && + !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET], + "pn-", NVME_FC_TRADDR_NNLEN))) { + nnoffset = NVME_FC_TRADDR_NNLEN; + pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN; + } else + goto out_einval; + + name[0] = '0'; + name[1] = 'x'; + name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0; + + memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN); + if (__nvme_fc_parse_u64(&wwn, &traddr->nn)) + goto out_einval; + + memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN); + if (__nvme_fc_parse_u64(&wwn, &traddr->pn)) + goto out_einval; + + return 0; + +out_einval: + pr_warn("%s: bad traddr string\n", __func__); + return -EINVAL; +} + +static int +nvmet_fc_add_port(struct nvmet_port *port) +{ + struct nvmet_fc_tgtport *tgtport; + struct nvmet_fc_traddr traddr = { 0L, 0L }; + unsigned long flags; + int ret; + + /* validate the address info */ + if ((port->disc_addr.trtype != NVMF_TRTYPE_FC) || + (port->disc_addr.adrfam != NVMF_ADDR_FAMILY_FC)) + return -EINVAL; + + /* map the traddr address info to a target port */ + + ret = nvme_fc_parse_traddr(&traddr, port->disc_addr.traddr, + sizeof(port->disc_addr.traddr)); + if (ret) + return ret; + + ret = -ENXIO; + spin_lock_irqsave(&nvmet_fc_tgtlock, flags); + list_for_each_entry(tgtport, &nvmet_fc_target_list, tgt_list) { + if ((tgtport->fc_target_port.node_name == traddr.nn) && + (tgtport->fc_target_port.port_name == traddr.pn)) { + tgtport->port = port; + ret = 0; + break; + } + } + spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); + return ret; +} + +static void +nvmet_fc_remove_port(struct nvmet_port *port) +{ + /* nothing to do */ +} + +static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = { + .owner = THIS_MODULE, + .type = NVMF_TRTYPE_FC, + .msdbd = 1, + .add_port = nvmet_fc_add_port, + .remove_port = nvmet_fc_remove_port, + .queue_response = nvmet_fc_fcp_nvme_cmd_done, + .delete_ctrl = nvmet_fc_delete_ctrl, +}; + +static int __init nvmet_fc_init_module(void) +{ + return nvmet_register_transport(&nvmet_fc_tgt_fcp_ops); +} + +static void __exit nvmet_fc_exit_module(void) +{ + /* sanity check - all lports should be removed */ + if (!list_empty(&nvmet_fc_target_list)) + pr_warn("%s: targetport list not empty\n", __func__); + + nvmet_unregister_transport(&nvmet_fc_tgt_fcp_ops); + + ida_destroy(&nvmet_fc_tgtport_cnt); +} + +module_init(nvmet_fc_init_module); +module_exit(nvmet_fc_exit_module); + +MODULE_LICENSE("GPL v2"); diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c new file mode 100644 index 000000000..291f4121f --- /dev/null +++ b/drivers/nvme/target/fcloop.c @@ -0,0 +1,1389 @@ +/* + * Copyright (c) 2016 Avago Technologies. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful. + * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, + * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A + * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO + * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID. + * See the GNU General Public License for more details, a copy of which + * can be found in the file COPYING included with this package + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/module.h> +#include <linux/parser.h> +#include <uapi/scsi/fc/fc_fs.h> + +#include "../host/nvme.h" +#include "../target/nvmet.h" +#include <linux/nvme-fc-driver.h> +#include <linux/nvme-fc.h> + + +enum { + NVMF_OPT_ERR = 0, + NVMF_OPT_WWNN = 1 << 0, + NVMF_OPT_WWPN = 1 << 1, + NVMF_OPT_ROLES = 1 << 2, + NVMF_OPT_FCADDR = 1 << 3, + NVMF_OPT_LPWWNN = 1 << 4, + NVMF_OPT_LPWWPN = 1 << 5, +}; + +struct fcloop_ctrl_options { + int mask; + u64 wwnn; + u64 wwpn; + u32 roles; + u32 fcaddr; + u64 lpwwnn; + u64 lpwwpn; +}; + +static const match_table_t opt_tokens = { + { NVMF_OPT_WWNN, "wwnn=%s" }, + { NVMF_OPT_WWPN, "wwpn=%s" }, + { NVMF_OPT_ROLES, "roles=%d" }, + { NVMF_OPT_FCADDR, "fcaddr=%x" }, + { NVMF_OPT_LPWWNN, "lpwwnn=%s" }, + { NVMF_OPT_LPWWPN, "lpwwpn=%s" }, + { NVMF_OPT_ERR, NULL } +}; + +static int +fcloop_parse_options(struct fcloop_ctrl_options *opts, + const char *buf) +{ + substring_t args[MAX_OPT_ARGS]; + char *options, *o, *p; + int token, ret = 0; + u64 token64; + + options = o = kstrdup(buf, GFP_KERNEL); + if (!options) + return -ENOMEM; + + while ((p = strsep(&o, ",\n")) != NULL) { + if (!*p) + continue; + + token = match_token(p, opt_tokens, args); + opts->mask |= token; + switch (token) { + case NVMF_OPT_WWNN: + if (match_u64(args, &token64)) { + ret = -EINVAL; + goto out_free_options; + } + opts->wwnn = token64; + break; + case NVMF_OPT_WWPN: + if (match_u64(args, &token64)) { + ret = -EINVAL; + goto out_free_options; + } + opts->wwpn = token64; + break; + case NVMF_OPT_ROLES: + if (match_int(args, &token)) { + ret = -EINVAL; + goto out_free_options; + } + opts->roles = token; + break; + case NVMF_OPT_FCADDR: + if (match_hex(args, &token)) { + ret = -EINVAL; + goto out_free_options; + } + opts->fcaddr = token; + break; + case NVMF_OPT_LPWWNN: + if (match_u64(args, &token64)) { + ret = -EINVAL; + goto out_free_options; + } + opts->lpwwnn = token64; + break; + case NVMF_OPT_LPWWPN: + if (match_u64(args, &token64)) { + ret = -EINVAL; + goto out_free_options; + } + opts->lpwwpn = token64; + break; + default: + pr_warn("unknown parameter or missing value '%s'\n", p); + ret = -EINVAL; + goto out_free_options; + } + } + +out_free_options: + kfree(options); + return ret; +} + + +static int +fcloop_parse_nm_options(struct device *dev, u64 *nname, u64 *pname, + const char *buf) +{ + substring_t args[MAX_OPT_ARGS]; + char *options, *o, *p; + int token, ret = 0; + u64 token64; + + *nname = -1; + *pname = -1; + + options = o = kstrdup(buf, GFP_KERNEL); + if (!options) + return -ENOMEM; + + while ((p = strsep(&o, ",\n")) != NULL) { + if (!*p) + continue; + + token = match_token(p, opt_tokens, args); + switch (token) { + case NVMF_OPT_WWNN: + if (match_u64(args, &token64)) { + ret = -EINVAL; + goto out_free_options; + } + *nname = token64; + break; + case NVMF_OPT_WWPN: + if (match_u64(args, &token64)) { + ret = -EINVAL; + goto out_free_options; + } + *pname = token64; + break; + default: + pr_warn("unknown parameter or missing value '%s'\n", p); + ret = -EINVAL; + goto out_free_options; + } + } + +out_free_options: + kfree(options); + + if (!ret) { + if (*nname == -1) + return -EINVAL; + if (*pname == -1) + return -EINVAL; + } + + return ret; +} + + +#define LPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN) + +#define RPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN | \ + NVMF_OPT_LPWWNN | NVMF_OPT_LPWWPN) + +#define TGTPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN) + + +static DEFINE_SPINLOCK(fcloop_lock); +static LIST_HEAD(fcloop_lports); +static LIST_HEAD(fcloop_nports); + +struct fcloop_lport { + struct nvme_fc_local_port *localport; + struct list_head lport_list; + struct completion unreg_done; +}; + +struct fcloop_lport_priv { + struct fcloop_lport *lport; +}; + +struct fcloop_rport { + struct nvme_fc_remote_port *remoteport; + struct nvmet_fc_target_port *targetport; + struct fcloop_nport *nport; + struct fcloop_lport *lport; +}; + +struct fcloop_tport { + struct nvmet_fc_target_port *targetport; + struct nvme_fc_remote_port *remoteport; + struct fcloop_nport *nport; + struct fcloop_lport *lport; +}; + +struct fcloop_nport { + struct fcloop_rport *rport; + struct fcloop_tport *tport; + struct fcloop_lport *lport; + struct list_head nport_list; + struct kref ref; + u64 node_name; + u64 port_name; + u32 port_role; + u32 port_id; +}; + +struct fcloop_lsreq { + struct fcloop_tport *tport; + struct nvmefc_ls_req *lsreq; + struct work_struct work; + struct nvmefc_tgt_ls_req tgt_ls_req; + int status; +}; + +enum { + INI_IO_START = 0, + INI_IO_ACTIVE = 1, + INI_IO_ABORTED = 2, + INI_IO_COMPLETED = 3, +}; + +struct fcloop_fcpreq { + struct fcloop_tport *tport; + struct nvmefc_fcp_req *fcpreq; + spinlock_t reqlock; + u16 status; + u32 inistate; + bool active; + bool aborted; + struct kref ref; + struct work_struct fcp_rcv_work; + struct work_struct abort_rcv_work; + struct work_struct tio_done_work; + struct nvmefc_tgt_fcp_req tgt_fcp_req; +}; + +struct fcloop_ini_fcpreq { + struct nvmefc_fcp_req *fcpreq; + struct fcloop_fcpreq *tfcp_req; + spinlock_t inilock; +}; + +static inline struct fcloop_lsreq * +tgt_ls_req_to_lsreq(struct nvmefc_tgt_ls_req *tgt_lsreq) +{ + return container_of(tgt_lsreq, struct fcloop_lsreq, tgt_ls_req); +} + +static inline struct fcloop_fcpreq * +tgt_fcp_req_to_fcpreq(struct nvmefc_tgt_fcp_req *tgt_fcpreq) +{ + return container_of(tgt_fcpreq, struct fcloop_fcpreq, tgt_fcp_req); +} + + +static int +fcloop_create_queue(struct nvme_fc_local_port *localport, + unsigned int qidx, u16 qsize, + void **handle) +{ + *handle = localport; + return 0; +} + +static void +fcloop_delete_queue(struct nvme_fc_local_port *localport, + unsigned int idx, void *handle) +{ +} + + +/* + * Transmit of LS RSP done (e.g. buffers all set). call back up + * initiator "done" flows. + */ +static void +fcloop_tgt_lsrqst_done_work(struct work_struct *work) +{ + struct fcloop_lsreq *tls_req = + container_of(work, struct fcloop_lsreq, work); + struct fcloop_tport *tport = tls_req->tport; + struct nvmefc_ls_req *lsreq = tls_req->lsreq; + + if (!tport || tport->remoteport) + lsreq->done(lsreq, tls_req->status); +} + +static int +fcloop_ls_req(struct nvme_fc_local_port *localport, + struct nvme_fc_remote_port *remoteport, + struct nvmefc_ls_req *lsreq) +{ + struct fcloop_lsreq *tls_req = lsreq->private; + struct fcloop_rport *rport = remoteport->private; + int ret = 0; + + tls_req->lsreq = lsreq; + INIT_WORK(&tls_req->work, fcloop_tgt_lsrqst_done_work); + + if (!rport->targetport) { + tls_req->status = -ECONNREFUSED; + tls_req->tport = NULL; + schedule_work(&tls_req->work); + return ret; + } + + tls_req->status = 0; + tls_req->tport = rport->targetport->private; + ret = nvmet_fc_rcv_ls_req(rport->targetport, &tls_req->tgt_ls_req, + lsreq->rqstaddr, lsreq->rqstlen); + + return ret; +} + +static int +fcloop_xmt_ls_rsp(struct nvmet_fc_target_port *tport, + struct nvmefc_tgt_ls_req *tgt_lsreq) +{ + struct fcloop_lsreq *tls_req = tgt_ls_req_to_lsreq(tgt_lsreq); + struct nvmefc_ls_req *lsreq = tls_req->lsreq; + + memcpy(lsreq->rspaddr, tgt_lsreq->rspbuf, + ((lsreq->rsplen < tgt_lsreq->rsplen) ? + lsreq->rsplen : tgt_lsreq->rsplen)); + tgt_lsreq->done(tgt_lsreq); + + schedule_work(&tls_req->work); + + return 0; +} + +static void +fcloop_tfcp_req_free(struct kref *ref) +{ + struct fcloop_fcpreq *tfcp_req = + container_of(ref, struct fcloop_fcpreq, ref); + + kfree(tfcp_req); +} + +static void +fcloop_tfcp_req_put(struct fcloop_fcpreq *tfcp_req) +{ + kref_put(&tfcp_req->ref, fcloop_tfcp_req_free); +} + +static int +fcloop_tfcp_req_get(struct fcloop_fcpreq *tfcp_req) +{ + return kref_get_unless_zero(&tfcp_req->ref); +} + +static void +fcloop_call_host_done(struct nvmefc_fcp_req *fcpreq, + struct fcloop_fcpreq *tfcp_req, int status) +{ + struct fcloop_ini_fcpreq *inireq = NULL; + + if (fcpreq) { + inireq = fcpreq->private; + spin_lock(&inireq->inilock); + inireq->tfcp_req = NULL; + spin_unlock(&inireq->inilock); + + fcpreq->status = status; + fcpreq->done(fcpreq); + } + + /* release original io reference on tgt struct */ + fcloop_tfcp_req_put(tfcp_req); +} + +static void +fcloop_fcp_recv_work(struct work_struct *work) +{ + struct fcloop_fcpreq *tfcp_req = + container_of(work, struct fcloop_fcpreq, fcp_rcv_work); + struct nvmefc_fcp_req *fcpreq = tfcp_req->fcpreq; + int ret = 0; + bool aborted = false; + + spin_lock(&tfcp_req->reqlock); + switch (tfcp_req->inistate) { + case INI_IO_START: + tfcp_req->inistate = INI_IO_ACTIVE; + break; + case INI_IO_ABORTED: + aborted = true; + break; + default: + spin_unlock(&tfcp_req->reqlock); + WARN_ON(1); + return; + } + spin_unlock(&tfcp_req->reqlock); + + if (unlikely(aborted)) + ret = -ECANCELED; + else + ret = nvmet_fc_rcv_fcp_req(tfcp_req->tport->targetport, + &tfcp_req->tgt_fcp_req, + fcpreq->cmdaddr, fcpreq->cmdlen); + if (ret) + fcloop_call_host_done(fcpreq, tfcp_req, ret); + + return; +} + +static void +fcloop_fcp_abort_recv_work(struct work_struct *work) +{ + struct fcloop_fcpreq *tfcp_req = + container_of(work, struct fcloop_fcpreq, abort_rcv_work); + struct nvmefc_fcp_req *fcpreq; + bool completed = false; + + spin_lock(&tfcp_req->reqlock); + fcpreq = tfcp_req->fcpreq; + switch (tfcp_req->inistate) { + case INI_IO_ABORTED: + break; + case INI_IO_COMPLETED: + completed = true; + break; + default: + spin_unlock(&tfcp_req->reqlock); + WARN_ON(1); + return; + } + spin_unlock(&tfcp_req->reqlock); + + if (unlikely(completed)) { + /* remove reference taken in original abort downcall */ + fcloop_tfcp_req_put(tfcp_req); + return; + } + + if (tfcp_req->tport->targetport) + nvmet_fc_rcv_fcp_abort(tfcp_req->tport->targetport, + &tfcp_req->tgt_fcp_req); + + spin_lock(&tfcp_req->reqlock); + tfcp_req->fcpreq = NULL; + spin_unlock(&tfcp_req->reqlock); + + fcloop_call_host_done(fcpreq, tfcp_req, -ECANCELED); + /* call_host_done releases reference for abort downcall */ +} + +/* + * FCP IO operation done by target completion. + * call back up initiator "done" flows. + */ +static void +fcloop_tgt_fcprqst_done_work(struct work_struct *work) +{ + struct fcloop_fcpreq *tfcp_req = + container_of(work, struct fcloop_fcpreq, tio_done_work); + struct nvmefc_fcp_req *fcpreq; + + spin_lock(&tfcp_req->reqlock); + fcpreq = tfcp_req->fcpreq; + tfcp_req->inistate = INI_IO_COMPLETED; + spin_unlock(&tfcp_req->reqlock); + + fcloop_call_host_done(fcpreq, tfcp_req, tfcp_req->status); +} + + +static int +fcloop_fcp_req(struct nvme_fc_local_port *localport, + struct nvme_fc_remote_port *remoteport, + void *hw_queue_handle, + struct nvmefc_fcp_req *fcpreq) +{ + struct fcloop_rport *rport = remoteport->private; + struct fcloop_ini_fcpreq *inireq = fcpreq->private; + struct fcloop_fcpreq *tfcp_req; + + if (!rport->targetport) + return -ECONNREFUSED; + + tfcp_req = kzalloc(sizeof(*tfcp_req), GFP_KERNEL); + if (!tfcp_req) + return -ENOMEM; + + inireq->fcpreq = fcpreq; + inireq->tfcp_req = tfcp_req; + spin_lock_init(&inireq->inilock); + + tfcp_req->fcpreq = fcpreq; + tfcp_req->tport = rport->targetport->private; + tfcp_req->inistate = INI_IO_START; + spin_lock_init(&tfcp_req->reqlock); + INIT_WORK(&tfcp_req->fcp_rcv_work, fcloop_fcp_recv_work); + INIT_WORK(&tfcp_req->abort_rcv_work, fcloop_fcp_abort_recv_work); + INIT_WORK(&tfcp_req->tio_done_work, fcloop_tgt_fcprqst_done_work); + kref_init(&tfcp_req->ref); + + schedule_work(&tfcp_req->fcp_rcv_work); + + return 0; +} + +static void +fcloop_fcp_copy_data(u8 op, struct scatterlist *data_sg, + struct scatterlist *io_sg, u32 offset, u32 length) +{ + void *data_p, *io_p; + u32 data_len, io_len, tlen; + + io_p = sg_virt(io_sg); + io_len = io_sg->length; + + for ( ; offset; ) { + tlen = min_t(u32, offset, io_len); + offset -= tlen; + io_len -= tlen; + if (!io_len) { + io_sg = sg_next(io_sg); + io_p = sg_virt(io_sg); + io_len = io_sg->length; + } else + io_p += tlen; + } + + data_p = sg_virt(data_sg); + data_len = data_sg->length; + + for ( ; length; ) { + tlen = min_t(u32, io_len, data_len); + tlen = min_t(u32, tlen, length); + + if (op == NVMET_FCOP_WRITEDATA) + memcpy(data_p, io_p, tlen); + else + memcpy(io_p, data_p, tlen); + + length -= tlen; + + io_len -= tlen; + if ((!io_len) && (length)) { + io_sg = sg_next(io_sg); + io_p = sg_virt(io_sg); + io_len = io_sg->length; + } else + io_p += tlen; + + data_len -= tlen; + if ((!data_len) && (length)) { + data_sg = sg_next(data_sg); + data_p = sg_virt(data_sg); + data_len = data_sg->length; + } else + data_p += tlen; + } +} + +static int +fcloop_fcp_op(struct nvmet_fc_target_port *tgtport, + struct nvmefc_tgt_fcp_req *tgt_fcpreq) +{ + struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq); + struct nvmefc_fcp_req *fcpreq; + u32 rsplen = 0, xfrlen = 0; + int fcp_err = 0, active, aborted; + u8 op = tgt_fcpreq->op; + + spin_lock(&tfcp_req->reqlock); + fcpreq = tfcp_req->fcpreq; + active = tfcp_req->active; + aborted = tfcp_req->aborted; + tfcp_req->active = true; + spin_unlock(&tfcp_req->reqlock); + + if (unlikely(active)) + /* illegal - call while i/o active */ + return -EALREADY; + + if (unlikely(aborted)) { + /* target transport has aborted i/o prior */ + spin_lock(&tfcp_req->reqlock); + tfcp_req->active = false; + spin_unlock(&tfcp_req->reqlock); + tgt_fcpreq->transferred_length = 0; + tgt_fcpreq->fcp_error = -ECANCELED; + tgt_fcpreq->done(tgt_fcpreq); + return 0; + } + + /* + * if fcpreq is NULL, the I/O has been aborted (from + * initiator side). For the target side, act as if all is well + * but don't actually move data. + */ + + switch (op) { + case NVMET_FCOP_WRITEDATA: + xfrlen = tgt_fcpreq->transfer_length; + if (fcpreq) { + fcloop_fcp_copy_data(op, tgt_fcpreq->sg, + fcpreq->first_sgl, tgt_fcpreq->offset, + xfrlen); + fcpreq->transferred_length += xfrlen; + } + break; + + case NVMET_FCOP_READDATA: + case NVMET_FCOP_READDATA_RSP: + xfrlen = tgt_fcpreq->transfer_length; + if (fcpreq) { + fcloop_fcp_copy_data(op, tgt_fcpreq->sg, + fcpreq->first_sgl, tgt_fcpreq->offset, + xfrlen); + fcpreq->transferred_length += xfrlen; + } + if (op == NVMET_FCOP_READDATA) + break; + + /* Fall-Thru to RSP handling */ + /* FALLTHRU */ + + case NVMET_FCOP_RSP: + if (fcpreq) { + rsplen = ((fcpreq->rsplen < tgt_fcpreq->rsplen) ? + fcpreq->rsplen : tgt_fcpreq->rsplen); + memcpy(fcpreq->rspaddr, tgt_fcpreq->rspaddr, rsplen); + if (rsplen < tgt_fcpreq->rsplen) + fcp_err = -E2BIG; + fcpreq->rcv_rsplen = rsplen; + fcpreq->status = 0; + } + tfcp_req->status = 0; + break; + + default: + fcp_err = -EINVAL; + break; + } + + spin_lock(&tfcp_req->reqlock); + tfcp_req->active = false; + spin_unlock(&tfcp_req->reqlock); + + tgt_fcpreq->transferred_length = xfrlen; + tgt_fcpreq->fcp_error = fcp_err; + tgt_fcpreq->done(tgt_fcpreq); + + return 0; +} + +static void +fcloop_tgt_fcp_abort(struct nvmet_fc_target_port *tgtport, + struct nvmefc_tgt_fcp_req *tgt_fcpreq) +{ + struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq); + + /* + * mark aborted only in case there were 2 threads in transport + * (one doing io, other doing abort) and only kills ops posted + * after the abort request + */ + spin_lock(&tfcp_req->reqlock); + tfcp_req->aborted = true; + spin_unlock(&tfcp_req->reqlock); + + tfcp_req->status = NVME_SC_INTERNAL; + + /* + * nothing more to do. If io wasn't active, the transport should + * immediately call the req_release. If it was active, the op + * will complete, and the lldd should call req_release. + */ +} + +static void +fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport, + struct nvmefc_tgt_fcp_req *tgt_fcpreq) +{ + struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq); + + schedule_work(&tfcp_req->tio_done_work); +} + +static void +fcloop_ls_abort(struct nvme_fc_local_port *localport, + struct nvme_fc_remote_port *remoteport, + struct nvmefc_ls_req *lsreq) +{ +} + +static void +fcloop_fcp_abort(struct nvme_fc_local_port *localport, + struct nvme_fc_remote_port *remoteport, + void *hw_queue_handle, + struct nvmefc_fcp_req *fcpreq) +{ + struct fcloop_ini_fcpreq *inireq = fcpreq->private; + struct fcloop_fcpreq *tfcp_req; + bool abortio = true; + + spin_lock(&inireq->inilock); + tfcp_req = inireq->tfcp_req; + if (tfcp_req) + fcloop_tfcp_req_get(tfcp_req); + spin_unlock(&inireq->inilock); + + if (!tfcp_req) + /* abort has already been called */ + return; + + /* break initiator/target relationship for io */ + spin_lock(&tfcp_req->reqlock); + switch (tfcp_req->inistate) { + case INI_IO_START: + case INI_IO_ACTIVE: + tfcp_req->inistate = INI_IO_ABORTED; + break; + case INI_IO_COMPLETED: + abortio = false; + break; + default: + spin_unlock(&tfcp_req->reqlock); + WARN_ON(1); + return; + } + spin_unlock(&tfcp_req->reqlock); + + if (abortio) + /* leave the reference while the work item is scheduled */ + WARN_ON(!schedule_work(&tfcp_req->abort_rcv_work)); + else { + /* + * as the io has already had the done callback made, + * nothing more to do. So release the reference taken above + */ + fcloop_tfcp_req_put(tfcp_req); + } +} + +static void +fcloop_nport_free(struct kref *ref) +{ + struct fcloop_nport *nport = + container_of(ref, struct fcloop_nport, ref); + unsigned long flags; + + spin_lock_irqsave(&fcloop_lock, flags); + list_del(&nport->nport_list); + spin_unlock_irqrestore(&fcloop_lock, flags); + + kfree(nport); +} + +static void +fcloop_nport_put(struct fcloop_nport *nport) +{ + kref_put(&nport->ref, fcloop_nport_free); +} + +static int +fcloop_nport_get(struct fcloop_nport *nport) +{ + return kref_get_unless_zero(&nport->ref); +} + +static void +fcloop_localport_delete(struct nvme_fc_local_port *localport) +{ + struct fcloop_lport_priv *lport_priv = localport->private; + struct fcloop_lport *lport = lport_priv->lport; + + /* release any threads waiting for the unreg to complete */ + complete(&lport->unreg_done); +} + +static void +fcloop_remoteport_delete(struct nvme_fc_remote_port *remoteport) +{ + struct fcloop_rport *rport = remoteport->private; + + fcloop_nport_put(rport->nport); +} + +static void +fcloop_targetport_delete(struct nvmet_fc_target_port *targetport) +{ + struct fcloop_tport *tport = targetport->private; + + fcloop_nport_put(tport->nport); +} + +#define FCLOOP_HW_QUEUES 4 +#define FCLOOP_SGL_SEGS 256 +#define FCLOOP_DMABOUND_4G 0xFFFFFFFF + +static struct nvme_fc_port_template fctemplate = { + .localport_delete = fcloop_localport_delete, + .remoteport_delete = fcloop_remoteport_delete, + .create_queue = fcloop_create_queue, + .delete_queue = fcloop_delete_queue, + .ls_req = fcloop_ls_req, + .fcp_io = fcloop_fcp_req, + .ls_abort = fcloop_ls_abort, + .fcp_abort = fcloop_fcp_abort, + .max_hw_queues = FCLOOP_HW_QUEUES, + .max_sgl_segments = FCLOOP_SGL_SEGS, + .max_dif_sgl_segments = FCLOOP_SGL_SEGS, + .dma_boundary = FCLOOP_DMABOUND_4G, + /* sizes of additional private data for data structures */ + .local_priv_sz = sizeof(struct fcloop_lport_priv), + .remote_priv_sz = sizeof(struct fcloop_rport), + .lsrqst_priv_sz = sizeof(struct fcloop_lsreq), + .fcprqst_priv_sz = sizeof(struct fcloop_ini_fcpreq), +}; + +static struct nvmet_fc_target_template tgttemplate = { + .targetport_delete = fcloop_targetport_delete, + .xmt_ls_rsp = fcloop_xmt_ls_rsp, + .fcp_op = fcloop_fcp_op, + .fcp_abort = fcloop_tgt_fcp_abort, + .fcp_req_release = fcloop_fcp_req_release, + .max_hw_queues = FCLOOP_HW_QUEUES, + .max_sgl_segments = FCLOOP_SGL_SEGS, + .max_dif_sgl_segments = FCLOOP_SGL_SEGS, + .dma_boundary = FCLOOP_DMABOUND_4G, + /* optional features */ + .target_features = 0, + /* sizes of additional private data for data structures */ + .target_priv_sz = sizeof(struct fcloop_tport), +}; + +static ssize_t +fcloop_create_local_port(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct nvme_fc_port_info pinfo; + struct fcloop_ctrl_options *opts; + struct nvme_fc_local_port *localport; + struct fcloop_lport *lport; + struct fcloop_lport_priv *lport_priv; + unsigned long flags; + int ret = -ENOMEM; + + lport = kzalloc(sizeof(*lport), GFP_KERNEL); + if (!lport) + return -ENOMEM; + + opts = kzalloc(sizeof(*opts), GFP_KERNEL); + if (!opts) + goto out_free_lport; + + ret = fcloop_parse_options(opts, buf); + if (ret) + goto out_free_opts; + + /* everything there ? */ + if ((opts->mask & LPORT_OPTS) != LPORT_OPTS) { + ret = -EINVAL; + goto out_free_opts; + } + + memset(&pinfo, 0, sizeof(pinfo)); + pinfo.node_name = opts->wwnn; + pinfo.port_name = opts->wwpn; + pinfo.port_role = opts->roles; + pinfo.port_id = opts->fcaddr; + + ret = nvme_fc_register_localport(&pinfo, &fctemplate, NULL, &localport); + if (!ret) { + /* success */ + lport_priv = localport->private; + lport_priv->lport = lport; + + lport->localport = localport; + INIT_LIST_HEAD(&lport->lport_list); + + spin_lock_irqsave(&fcloop_lock, flags); + list_add_tail(&lport->lport_list, &fcloop_lports); + spin_unlock_irqrestore(&fcloop_lock, flags); + } + +out_free_opts: + kfree(opts); +out_free_lport: + /* free only if we're going to fail */ + if (ret) + kfree(lport); + + return ret ? ret : count; +} + + +static void +__unlink_local_port(struct fcloop_lport *lport) +{ + list_del(&lport->lport_list); +} + +static int +__wait_localport_unreg(struct fcloop_lport *lport) +{ + int ret; + + init_completion(&lport->unreg_done); + + ret = nvme_fc_unregister_localport(lport->localport); + + wait_for_completion(&lport->unreg_done); + + kfree(lport); + + return ret; +} + + +static ssize_t +fcloop_delete_local_port(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fcloop_lport *tlport, *lport = NULL; + u64 nodename, portname; + unsigned long flags; + int ret; + + ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf); + if (ret) + return ret; + + spin_lock_irqsave(&fcloop_lock, flags); + + list_for_each_entry(tlport, &fcloop_lports, lport_list) { + if (tlport->localport->node_name == nodename && + tlport->localport->port_name == portname) { + lport = tlport; + __unlink_local_port(lport); + break; + } + } + spin_unlock_irqrestore(&fcloop_lock, flags); + + if (!lport) + return -ENOENT; + + ret = __wait_localport_unreg(lport); + + return ret ? ret : count; +} + +static struct fcloop_nport * +fcloop_alloc_nport(const char *buf, size_t count, bool remoteport) +{ + struct fcloop_nport *newnport, *nport = NULL; + struct fcloop_lport *tmplport, *lport = NULL; + struct fcloop_ctrl_options *opts; + unsigned long flags; + u32 opts_mask = (remoteport) ? RPORT_OPTS : TGTPORT_OPTS; + int ret; + + opts = kzalloc(sizeof(*opts), GFP_KERNEL); + if (!opts) + return NULL; + + ret = fcloop_parse_options(opts, buf); + if (ret) + goto out_free_opts; + + /* everything there ? */ + if ((opts->mask & opts_mask) != opts_mask) { + ret = -EINVAL; + goto out_free_opts; + } + + newnport = kzalloc(sizeof(*newnport), GFP_KERNEL); + if (!newnport) + goto out_free_opts; + + INIT_LIST_HEAD(&newnport->nport_list); + newnport->node_name = opts->wwnn; + newnport->port_name = opts->wwpn; + if (opts->mask & NVMF_OPT_ROLES) + newnport->port_role = opts->roles; + if (opts->mask & NVMF_OPT_FCADDR) + newnport->port_id = opts->fcaddr; + kref_init(&newnport->ref); + + spin_lock_irqsave(&fcloop_lock, flags); + + list_for_each_entry(tmplport, &fcloop_lports, lport_list) { + if (tmplport->localport->node_name == opts->wwnn && + tmplport->localport->port_name == opts->wwpn) + goto out_invalid_opts; + + if (tmplport->localport->node_name == opts->lpwwnn && + tmplport->localport->port_name == opts->lpwwpn) + lport = tmplport; + } + + if (remoteport) { + if (!lport) + goto out_invalid_opts; + newnport->lport = lport; + } + + list_for_each_entry(nport, &fcloop_nports, nport_list) { + if (nport->node_name == opts->wwnn && + nport->port_name == opts->wwpn) { + if ((remoteport && nport->rport) || + (!remoteport && nport->tport)) { + nport = NULL; + goto out_invalid_opts; + } + + fcloop_nport_get(nport); + + spin_unlock_irqrestore(&fcloop_lock, flags); + + if (remoteport) + nport->lport = lport; + if (opts->mask & NVMF_OPT_ROLES) + nport->port_role = opts->roles; + if (opts->mask & NVMF_OPT_FCADDR) + nport->port_id = opts->fcaddr; + goto out_free_newnport; + } + } + + list_add_tail(&newnport->nport_list, &fcloop_nports); + + spin_unlock_irqrestore(&fcloop_lock, flags); + + kfree(opts); + return newnport; + +out_invalid_opts: + spin_unlock_irqrestore(&fcloop_lock, flags); +out_free_newnport: + kfree(newnport); +out_free_opts: + kfree(opts); + return nport; +} + +static ssize_t +fcloop_create_remote_port(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct nvme_fc_remote_port *remoteport; + struct fcloop_nport *nport; + struct fcloop_rport *rport; + struct nvme_fc_port_info pinfo; + int ret; + + nport = fcloop_alloc_nport(buf, count, true); + if (!nport) + return -EIO; + + memset(&pinfo, 0, sizeof(pinfo)); + pinfo.node_name = nport->node_name; + pinfo.port_name = nport->port_name; + pinfo.port_role = nport->port_role; + pinfo.port_id = nport->port_id; + + ret = nvme_fc_register_remoteport(nport->lport->localport, + &pinfo, &remoteport); + if (ret || !remoteport) { + fcloop_nport_put(nport); + return ret; + } + + /* success */ + rport = remoteport->private; + rport->remoteport = remoteport; + rport->targetport = (nport->tport) ? nport->tport->targetport : NULL; + if (nport->tport) { + nport->tport->remoteport = remoteport; + nport->tport->lport = nport->lport; + } + rport->nport = nport; + rport->lport = nport->lport; + nport->rport = rport; + + return count; +} + + +static struct fcloop_rport * +__unlink_remote_port(struct fcloop_nport *nport) +{ + struct fcloop_rport *rport = nport->rport; + + if (rport && nport->tport) + nport->tport->remoteport = NULL; + nport->rport = NULL; + + return rport; +} + +static int +__remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport) +{ + if (!rport) + return -EALREADY; + + return nvme_fc_unregister_remoteport(rport->remoteport); +} + +static ssize_t +fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fcloop_nport *nport = NULL, *tmpport; + static struct fcloop_rport *rport; + u64 nodename, portname; + unsigned long flags; + int ret; + + ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf); + if (ret) + return ret; + + spin_lock_irqsave(&fcloop_lock, flags); + + list_for_each_entry(tmpport, &fcloop_nports, nport_list) { + if (tmpport->node_name == nodename && + tmpport->port_name == portname && tmpport->rport) { + nport = tmpport; + rport = __unlink_remote_port(nport); + break; + } + } + + spin_unlock_irqrestore(&fcloop_lock, flags); + + if (!nport) + return -ENOENT; + + ret = __remoteport_unreg(nport, rport); + + return ret ? ret : count; +} + +static ssize_t +fcloop_create_target_port(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct nvmet_fc_target_port *targetport; + struct fcloop_nport *nport; + struct fcloop_tport *tport; + struct nvmet_fc_port_info tinfo; + int ret; + + nport = fcloop_alloc_nport(buf, count, false); + if (!nport) + return -EIO; + + tinfo.node_name = nport->node_name; + tinfo.port_name = nport->port_name; + tinfo.port_id = nport->port_id; + + ret = nvmet_fc_register_targetport(&tinfo, &tgttemplate, NULL, + &targetport); + if (ret) { + fcloop_nport_put(nport); + return ret; + } + + /* success */ + tport = targetport->private; + tport->targetport = targetport; + tport->remoteport = (nport->rport) ? nport->rport->remoteport : NULL; + if (nport->rport) + nport->rport->targetport = targetport; + tport->nport = nport; + tport->lport = nport->lport; + nport->tport = tport; + + return count; +} + + +static struct fcloop_tport * +__unlink_target_port(struct fcloop_nport *nport) +{ + struct fcloop_tport *tport = nport->tport; + + if (tport && nport->rport) + nport->rport->targetport = NULL; + nport->tport = NULL; + + return tport; +} + +static int +__targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport) +{ + if (!tport) + return -EALREADY; + + return nvmet_fc_unregister_targetport(tport->targetport); +} + +static ssize_t +fcloop_delete_target_port(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fcloop_nport *nport = NULL, *tmpport; + struct fcloop_tport *tport = NULL; + u64 nodename, portname; + unsigned long flags; + int ret; + + ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf); + if (ret) + return ret; + + spin_lock_irqsave(&fcloop_lock, flags); + + list_for_each_entry(tmpport, &fcloop_nports, nport_list) { + if (tmpport->node_name == nodename && + tmpport->port_name == portname && tmpport->tport) { + nport = tmpport; + tport = __unlink_target_port(nport); + break; + } + } + + spin_unlock_irqrestore(&fcloop_lock, flags); + + if (!nport) + return -ENOENT; + + ret = __targetport_unreg(nport, tport); + + return ret ? ret : count; +} + + +static DEVICE_ATTR(add_local_port, 0200, NULL, fcloop_create_local_port); +static DEVICE_ATTR(del_local_port, 0200, NULL, fcloop_delete_local_port); +static DEVICE_ATTR(add_remote_port, 0200, NULL, fcloop_create_remote_port); +static DEVICE_ATTR(del_remote_port, 0200, NULL, fcloop_delete_remote_port); +static DEVICE_ATTR(add_target_port, 0200, NULL, fcloop_create_target_port); +static DEVICE_ATTR(del_target_port, 0200, NULL, fcloop_delete_target_port); + +static struct attribute *fcloop_dev_attrs[] = { + &dev_attr_add_local_port.attr, + &dev_attr_del_local_port.attr, + &dev_attr_add_remote_port.attr, + &dev_attr_del_remote_port.attr, + &dev_attr_add_target_port.attr, + &dev_attr_del_target_port.attr, + NULL +}; + +static struct attribute_group fclopp_dev_attrs_group = { + .attrs = fcloop_dev_attrs, +}; + +static const struct attribute_group *fcloop_dev_attr_groups[] = { + &fclopp_dev_attrs_group, + NULL, +}; + +static struct class *fcloop_class; +static struct device *fcloop_device; + + +static int __init fcloop_init(void) +{ + int ret; + + fcloop_class = class_create(THIS_MODULE, "fcloop"); + if (IS_ERR(fcloop_class)) { + pr_err("couldn't register class fcloop\n"); + ret = PTR_ERR(fcloop_class); + return ret; + } + + fcloop_device = device_create_with_groups( + fcloop_class, NULL, MKDEV(0, 0), NULL, + fcloop_dev_attr_groups, "ctl"); + if (IS_ERR(fcloop_device)) { + pr_err("couldn't create ctl device!\n"); + ret = PTR_ERR(fcloop_device); + goto out_destroy_class; + } + + get_device(fcloop_device); + + return 0; + +out_destroy_class: + class_destroy(fcloop_class); + return ret; +} + +static void __exit fcloop_exit(void) +{ + struct fcloop_lport *lport; + struct fcloop_nport *nport; + struct fcloop_tport *tport; + struct fcloop_rport *rport; + unsigned long flags; + int ret; + + spin_lock_irqsave(&fcloop_lock, flags); + + for (;;) { + nport = list_first_entry_or_null(&fcloop_nports, + typeof(*nport), nport_list); + if (!nport) + break; + + tport = __unlink_target_port(nport); + rport = __unlink_remote_port(nport); + + spin_unlock_irqrestore(&fcloop_lock, flags); + + ret = __targetport_unreg(nport, tport); + if (ret) + pr_warn("%s: Failed deleting target port\n", __func__); + + ret = __remoteport_unreg(nport, rport); + if (ret) + pr_warn("%s: Failed deleting remote port\n", __func__); + + spin_lock_irqsave(&fcloop_lock, flags); + } + + for (;;) { + lport = list_first_entry_or_null(&fcloop_lports, + typeof(*lport), lport_list); + if (!lport) + break; + + __unlink_local_port(lport); + + spin_unlock_irqrestore(&fcloop_lock, flags); + + ret = __wait_localport_unreg(lport); + if (ret) + pr_warn("%s: Failed deleting local port\n", __func__); + + spin_lock_irqsave(&fcloop_lock, flags); + } + + spin_unlock_irqrestore(&fcloop_lock, flags); + + put_device(fcloop_device); + + device_destroy(fcloop_class, MKDEV(0, 0)); + class_destroy(fcloop_class); +} + +module_init(fcloop_init); +module_exit(fcloop_exit); + +MODULE_LICENSE("GPL v2"); diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c new file mode 100644 index 000000000..1096dd01c --- /dev/null +++ b/drivers/nvme/target/io-cmd-bdev.c @@ -0,0 +1,249 @@ +/* + * NVMe I/O command implementation. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/blkdev.h> +#include <linux/module.h> +#include "nvmet.h" + +int nvmet_bdev_ns_enable(struct nvmet_ns *ns) +{ + int ret; + + ns->bdev = blkdev_get_by_path(ns->device_path, + FMODE_READ | FMODE_WRITE, NULL); + if (IS_ERR(ns->bdev)) { + ret = PTR_ERR(ns->bdev); + if (ret != -ENOTBLK) { + pr_err("failed to open block device %s: (%ld)\n", + ns->device_path, PTR_ERR(ns->bdev)); + } + ns->bdev = NULL; + return ret; + } + ns->size = i_size_read(ns->bdev->bd_inode); + ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev)); + return 0; +} + +void nvmet_bdev_ns_disable(struct nvmet_ns *ns) +{ + if (ns->bdev) { + blkdev_put(ns->bdev, FMODE_WRITE | FMODE_READ); + ns->bdev = NULL; + } +} + +static void nvmet_bio_done(struct bio *bio) +{ + struct nvmet_req *req = bio->bi_private; + + nvmet_req_complete(req, + bio->bi_status ? NVME_SC_INTERNAL | NVME_SC_DNR : 0); + + if (bio != &req->b.inline_bio) + bio_put(bio); +} + +static void nvmet_bdev_execute_rw(struct nvmet_req *req) +{ + int sg_cnt = req->sg_cnt; + struct bio *bio = &req->b.inline_bio; + struct scatterlist *sg; + sector_t sector; + blk_qc_t cookie; + int op, op_flags = 0, i; + + if (!req->sg_cnt) { + nvmet_req_complete(req, 0); + return; + } + + if (req->cmd->rw.opcode == nvme_cmd_write) { + op = REQ_OP_WRITE; + op_flags = REQ_SYNC | REQ_IDLE; + if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA)) + op_flags |= REQ_FUA; + } else { + op = REQ_OP_READ; + } + + sector = le64_to_cpu(req->cmd->rw.slba); + sector <<= (req->ns->blksize_shift - 9); + + bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec)); + bio_set_dev(bio, req->ns->bdev); + bio->bi_iter.bi_sector = sector; + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + bio_set_op_attrs(bio, op, op_flags); + + for_each_sg(req->sg, sg, req->sg_cnt, i) { + while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) + != sg->length) { + struct bio *prev = bio; + + bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES)); + bio_set_dev(bio, req->ns->bdev); + bio->bi_iter.bi_sector = sector; + bio_set_op_attrs(bio, op, op_flags); + + bio_chain(bio, prev); + submit_bio(prev); + } + + sector += sg->length >> 9; + sg_cnt--; + } + + cookie = submit_bio(bio); + + blk_poll(bdev_get_queue(req->ns->bdev), cookie); +} + +static void nvmet_bdev_execute_flush(struct nvmet_req *req) +{ + struct bio *bio = &req->b.inline_bio; + + bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec)); + bio_set_dev(bio, req->ns->bdev); + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; + + submit_bio(bio); +} + +u16 nvmet_bdev_flush(struct nvmet_req *req) +{ + if (blkdev_issue_flush(req->ns->bdev, GFP_KERNEL, NULL)) + return NVME_SC_INTERNAL | NVME_SC_DNR; + return 0; +} + +static u16 nvmet_bdev_discard_range(struct nvmet_ns *ns, + struct nvme_dsm_range *range, struct bio **bio) +{ + int ret; + + ret = __blkdev_issue_discard(ns->bdev, + le64_to_cpu(range->slba) << (ns->blksize_shift - 9), + le32_to_cpu(range->nlb) << (ns->blksize_shift - 9), + GFP_KERNEL, 0, bio); + if (ret && ret != -EOPNOTSUPP) + return NVME_SC_INTERNAL | NVME_SC_DNR; + return 0; +} + +static void nvmet_bdev_execute_discard(struct nvmet_req *req) +{ + struct nvme_dsm_range range; + struct bio *bio = NULL; + int i; + u16 status; + + for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) { + status = nvmet_copy_from_sgl(req, i * sizeof(range), &range, + sizeof(range)); + if (status) + break; + + status = nvmet_bdev_discard_range(req->ns, &range, &bio); + if (status) + break; + } + + if (bio) { + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + if (status) { + bio->bi_status = BLK_STS_IOERR; + bio_endio(bio); + } else { + submit_bio(bio); + } + } else { + nvmet_req_complete(req, status); + } +} + +static void nvmet_bdev_execute_dsm(struct nvmet_req *req) +{ + switch (le32_to_cpu(req->cmd->dsm.attributes)) { + case NVME_DSMGMT_AD: + nvmet_bdev_execute_discard(req); + return; + case NVME_DSMGMT_IDR: + case NVME_DSMGMT_IDW: + default: + /* Not supported yet */ + nvmet_req_complete(req, 0); + return; + } +} + +static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req) +{ + struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes; + struct bio *bio = NULL; + u16 status = NVME_SC_SUCCESS; + sector_t sector; + sector_t nr_sector; + + sector = le64_to_cpu(write_zeroes->slba) << + (req->ns->blksize_shift - 9); + nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) << + (req->ns->blksize_shift - 9)); + + if (__blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector, + GFP_KERNEL, &bio, 0)) + status = NVME_SC_INTERNAL | NVME_SC_DNR; + + if (bio) { + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + submit_bio(bio); + } else { + nvmet_req_complete(req, status); + } +} + +u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + switch (cmd->common.opcode) { + case nvme_cmd_read: + case nvme_cmd_write: + req->execute = nvmet_bdev_execute_rw; + req->data_len = nvmet_rw_len(req); + return 0; + case nvme_cmd_flush: + req->execute = nvmet_bdev_execute_flush; + req->data_len = 0; + return 0; + case nvme_cmd_dsm: + req->execute = nvmet_bdev_execute_dsm; + req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) * + sizeof(struct nvme_dsm_range); + return 0; + case nvme_cmd_write_zeroes: + req->execute = nvmet_bdev_execute_write_zeroes; + req->data_len = 0; + return 0; + default: + pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode, + req->sq->qid); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } +} diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c new file mode 100644 index 000000000..ad6263cf7 --- /dev/null +++ b/drivers/nvme/target/io-cmd-file.c @@ -0,0 +1,349 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * NVMe Over Fabrics Target File I/O commands implementation. + * Copyright (c) 2017-2018 Western Digital Corporation or its + * affiliates. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/uio.h> +#include <linux/falloc.h> +#include <linux/file.h> +#include "nvmet.h" + +#define NVMET_MAX_MPOOL_BVEC 16 +#define NVMET_MIN_MPOOL_OBJ 16 + +void nvmet_file_ns_disable(struct nvmet_ns *ns) +{ + if (ns->file) { + if (ns->buffered_io) + flush_workqueue(buffered_io_wq); + mempool_destroy(ns->bvec_pool); + ns->bvec_pool = NULL; + kmem_cache_destroy(ns->bvec_cache); + ns->bvec_cache = NULL; + fput(ns->file); + ns->file = NULL; + } +} + +int nvmet_file_ns_enable(struct nvmet_ns *ns) +{ + int flags = O_RDWR | O_LARGEFILE; + struct kstat stat; + int ret; + + if (!ns->buffered_io) + flags |= O_DIRECT; + + ns->file = filp_open(ns->device_path, flags, 0); + if (IS_ERR(ns->file)) { + ret = PTR_ERR(ns->file); + pr_err("failed to open file %s: (%d)\n", + ns->device_path, ret); + ns->file = NULL; + return ret; + } + + ret = vfs_getattr(&ns->file->f_path, + &stat, STATX_SIZE, AT_STATX_FORCE_SYNC); + if (ret) + goto err; + + ns->size = stat.size; + ns->blksize_shift = file_inode(ns->file)->i_blkbits; + + ns->bvec_cache = kmem_cache_create("nvmet-bvec", + NVMET_MAX_MPOOL_BVEC * sizeof(struct bio_vec), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!ns->bvec_cache) { + ret = -ENOMEM; + goto err; + } + + ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab, + mempool_free_slab, ns->bvec_cache); + + if (!ns->bvec_pool) { + ret = -ENOMEM; + goto err; + } + + return ret; +err: + ns->size = 0; + ns->blksize_shift = 0; + nvmet_file_ns_disable(ns); + return ret; +} + +static void nvmet_file_init_bvec(struct bio_vec *bv, struct sg_page_iter *iter) +{ + bv->bv_page = sg_page_iter_page(iter); + bv->bv_offset = iter->sg->offset; + bv->bv_len = PAGE_SIZE - iter->sg->offset; +} + +static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos, + unsigned long nr_segs, size_t count) +{ + struct kiocb *iocb = &req->f.iocb; + ssize_t (*call_iter)(struct kiocb *iocb, struct iov_iter *iter); + struct iov_iter iter; + int ki_flags = 0, rw; + ssize_t ret; + + if (req->cmd->rw.opcode == nvme_cmd_write) { + if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA)) + ki_flags = IOCB_DSYNC; + call_iter = req->ns->file->f_op->write_iter; + rw = WRITE; + } else { + call_iter = req->ns->file->f_op->read_iter; + rw = READ; + } + + iov_iter_bvec(&iter, ITER_BVEC | rw, req->f.bvec, nr_segs, count); + + iocb->ki_pos = pos; + iocb->ki_filp = req->ns->file; + iocb->ki_flags = ki_flags | iocb_flags(req->ns->file); + + ret = call_iter(iocb, &iter); + + if (ret != -EIOCBQUEUED && iocb->ki_complete) + iocb->ki_complete(iocb, ret, 0); + + return ret; +} + +static void nvmet_file_io_done(struct kiocb *iocb, long ret, long ret2) +{ + struct nvmet_req *req = container_of(iocb, struct nvmet_req, f.iocb); + + if (req->f.bvec != req->inline_bvec) { + if (likely(req->f.mpool_alloc == false)) + kfree(req->f.bvec); + else + mempool_free(req->f.bvec, req->ns->bvec_pool); + } + + nvmet_req_complete(req, ret != req->data_len ? + NVME_SC_INTERNAL | NVME_SC_DNR : 0); +} + +static void nvmet_file_execute_rw(struct nvmet_req *req) +{ + ssize_t nr_bvec = DIV_ROUND_UP(req->data_len, PAGE_SIZE); + struct sg_page_iter sg_pg_iter; + unsigned long bv_cnt = 0; + bool is_sync = false; + size_t len = 0, total_len = 0; + ssize_t ret = 0; + loff_t pos; + + if (!req->sg_cnt || !nr_bvec) { + nvmet_req_complete(req, 0); + return; + } + + pos = le64_to_cpu(req->cmd->rw.slba) << req->ns->blksize_shift; + if (unlikely(pos + req->data_len > req->ns->size)) { + nvmet_req_complete(req, NVME_SC_LBA_RANGE | NVME_SC_DNR); + return; + } + + if (nr_bvec > NVMET_MAX_INLINE_BIOVEC) + req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec), + GFP_KERNEL); + else + req->f.bvec = req->inline_bvec; + + req->f.mpool_alloc = false; + if (unlikely(!req->f.bvec)) { + /* fallback under memory pressure */ + req->f.bvec = mempool_alloc(req->ns->bvec_pool, GFP_KERNEL); + req->f.mpool_alloc = true; + if (nr_bvec > NVMET_MAX_MPOOL_BVEC) + is_sync = true; + } + + memset(&req->f.iocb, 0, sizeof(struct kiocb)); + for_each_sg_page(req->sg, &sg_pg_iter, req->sg_cnt, 0) { + nvmet_file_init_bvec(&req->f.bvec[bv_cnt], &sg_pg_iter); + len += req->f.bvec[bv_cnt].bv_len; + total_len += req->f.bvec[bv_cnt].bv_len; + bv_cnt++; + + WARN_ON_ONCE((nr_bvec - 1) < 0); + + if (unlikely(is_sync) && + (nr_bvec - 1 == 0 || bv_cnt == NVMET_MAX_MPOOL_BVEC)) { + ret = nvmet_file_submit_bvec(req, pos, bv_cnt, len); + if (ret < 0) + goto out; + pos += len; + bv_cnt = 0; + len = 0; + } + nr_bvec--; + } + + if (WARN_ON_ONCE(total_len != req->data_len)) + ret = -EIO; +out: + if (unlikely(is_sync || ret)) { + nvmet_file_io_done(&req->f.iocb, ret < 0 ? ret : total_len, 0); + return; + } + req->f.iocb.ki_complete = nvmet_file_io_done; + nvmet_file_submit_bvec(req, pos, bv_cnt, total_len); +} + +static void nvmet_file_buffered_io_work(struct work_struct *w) +{ + struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); + + nvmet_file_execute_rw(req); +} + +static void nvmet_file_execute_rw_buffered_io(struct nvmet_req *req) +{ + INIT_WORK(&req->f.work, nvmet_file_buffered_io_work); + queue_work(buffered_io_wq, &req->f.work); +} + +u16 nvmet_file_flush(struct nvmet_req *req) +{ + if (vfs_fsync(req->ns->file, 1) < 0) + return NVME_SC_INTERNAL | NVME_SC_DNR; + return 0; +} + +static void nvmet_file_flush_work(struct work_struct *w) +{ + struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); + + nvmet_req_complete(req, nvmet_file_flush(req)); +} + +static void nvmet_file_execute_flush(struct nvmet_req *req) +{ + INIT_WORK(&req->f.work, nvmet_file_flush_work); + schedule_work(&req->f.work); +} + +static void nvmet_file_execute_discard(struct nvmet_req *req) +{ + int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; + struct nvme_dsm_range range; + loff_t offset, len; + u16 ret; + int i; + + for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) { + ret = nvmet_copy_from_sgl(req, i * sizeof(range), &range, + sizeof(range)); + if (ret) + break; + + offset = le64_to_cpu(range.slba) << req->ns->blksize_shift; + len = le32_to_cpu(range.nlb); + len <<= req->ns->blksize_shift; + if (offset + len > req->ns->size) { + ret = NVME_SC_LBA_RANGE | NVME_SC_DNR; + break; + } + + if (vfs_fallocate(req->ns->file, mode, offset, len)) { + ret = NVME_SC_INTERNAL | NVME_SC_DNR; + break; + } + } + + nvmet_req_complete(req, ret); +} + +static void nvmet_file_dsm_work(struct work_struct *w) +{ + struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); + + switch (le32_to_cpu(req->cmd->dsm.attributes)) { + case NVME_DSMGMT_AD: + nvmet_file_execute_discard(req); + return; + case NVME_DSMGMT_IDR: + case NVME_DSMGMT_IDW: + default: + /* Not supported yet */ + nvmet_req_complete(req, 0); + return; + } +} + +static void nvmet_file_execute_dsm(struct nvmet_req *req) +{ + INIT_WORK(&req->f.work, nvmet_file_dsm_work); + schedule_work(&req->f.work); +} + +static void nvmet_file_write_zeroes_work(struct work_struct *w) +{ + struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); + struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes; + int mode = FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE; + loff_t offset; + loff_t len; + int ret; + + offset = le64_to_cpu(write_zeroes->slba) << req->ns->blksize_shift; + len = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) << + req->ns->blksize_shift); + + if (unlikely(offset + len > req->ns->size)) { + nvmet_req_complete(req, NVME_SC_LBA_RANGE | NVME_SC_DNR); + return; + } + + ret = vfs_fallocate(req->ns->file, mode, offset, len); + nvmet_req_complete(req, ret < 0 ? NVME_SC_INTERNAL | NVME_SC_DNR : 0); +} + +static void nvmet_file_execute_write_zeroes(struct nvmet_req *req) +{ + INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work); + schedule_work(&req->f.work); +} + +u16 nvmet_file_parse_io_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + switch (cmd->common.opcode) { + case nvme_cmd_read: + case nvme_cmd_write: + if (req->ns->buffered_io) + req->execute = nvmet_file_execute_rw_buffered_io; + else + req->execute = nvmet_file_execute_rw; + req->data_len = nvmet_rw_len(req); + return 0; + case nvme_cmd_flush: + req->execute = nvmet_file_execute_flush; + req->data_len = 0; + return 0; + case nvme_cmd_dsm: + req->execute = nvmet_file_execute_dsm; + req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) * + sizeof(struct nvme_dsm_range); + return 0; + case nvme_cmd_write_zeroes: + req->execute = nvmet_file_execute_write_zeroes; + req->data_len = 0; + return 0; + default: + pr_err("unhandled cmd for file ns %d on qid %d\n", + cmd->common.opcode, req->sq->qid); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } +} diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c new file mode 100644 index 000000000..08b52f3ed --- /dev/null +++ b/drivers/nvme/target/loop.c @@ -0,0 +1,744 @@ +/* + * NVMe over Fabrics loopback device. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/scatterlist.h> +#include <linux/blk-mq.h> +#include <linux/nvme.h> +#include <linux/module.h> +#include <linux/parser.h> +#include "nvmet.h" +#include "../host/nvme.h" +#include "../host/fabrics.h" + +#define NVME_LOOP_MAX_SEGMENTS 256 + +struct nvme_loop_iod { + struct nvme_request nvme_req; + struct nvme_command cmd; + struct nvme_completion rsp; + struct nvmet_req req; + struct nvme_loop_queue *queue; + struct work_struct work; + struct sg_table sg_table; + struct scatterlist first_sgl[]; +}; + +struct nvme_loop_ctrl { + struct nvme_loop_queue *queues; + + struct blk_mq_tag_set admin_tag_set; + + struct list_head list; + struct blk_mq_tag_set tag_set; + struct nvme_loop_iod async_event_iod; + struct nvme_ctrl ctrl; + + struct nvmet_ctrl *target_ctrl; + struct nvmet_port *port; +}; + +static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) +{ + return container_of(ctrl, struct nvme_loop_ctrl, ctrl); +} + +enum nvme_loop_queue_flags { + NVME_LOOP_Q_LIVE = 0, +}; + +struct nvme_loop_queue { + struct nvmet_cq nvme_cq; + struct nvmet_sq nvme_sq; + struct nvme_loop_ctrl *ctrl; + unsigned long flags; +}; + +static LIST_HEAD(nvme_loop_ports); +static DEFINE_MUTEX(nvme_loop_ports_mutex); + +static LIST_HEAD(nvme_loop_ctrl_list); +static DEFINE_MUTEX(nvme_loop_ctrl_mutex); + +static void nvme_loop_queue_response(struct nvmet_req *nvme_req); +static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); + +static const struct nvmet_fabrics_ops nvme_loop_ops; + +static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) +{ + return queue - queue->ctrl->queues; +} + +static void nvme_loop_complete_rq(struct request *req) +{ + struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); + + nvme_cleanup_cmd(req); + sg_free_table_chained(&iod->sg_table, true); + nvme_complete_rq(req); +} + +static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) +{ + u32 queue_idx = nvme_loop_queue_idx(queue); + + if (queue_idx == 0) + return queue->ctrl->admin_tag_set.tags[queue_idx]; + return queue->ctrl->tag_set.tags[queue_idx - 1]; +} + +static void nvme_loop_queue_response(struct nvmet_req *req) +{ + struct nvme_loop_queue *queue = + container_of(req->sq, struct nvme_loop_queue, nvme_sq); + struct nvme_completion *cqe = req->rsp; + + /* + * AEN requests are special as they don't time out and can + * survive any kind of queue freeze and often don't respond to + * aborts. We don't even bother to allocate a struct request + * for them but rather special case them here. + */ + if (unlikely(nvme_loop_queue_idx(queue) == 0 && + cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { + nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, + &cqe->result); + } else { + struct request *rq; + + rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); + if (!rq) { + dev_err(queue->ctrl->ctrl.device, + "tag 0x%x on queue %d not found\n", + cqe->command_id, nvme_loop_queue_idx(queue)); + return; + } + + nvme_end_request(rq, cqe->status, cqe->result); + } +} + +static void nvme_loop_execute_work(struct work_struct *work) +{ + struct nvme_loop_iod *iod = + container_of(work, struct nvme_loop_iod, work); + + nvmet_req_execute(&iod->req); +} + +static enum blk_eh_timer_return +nvme_loop_timeout(struct request *rq, bool reserved) +{ + struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq); + + /* queue error recovery */ + nvme_reset_ctrl(&iod->queue->ctrl->ctrl); + + /* fail with DNR on admin cmd timeout */ + nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR; + + return BLK_EH_DONE; +} + +static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct nvme_ns *ns = hctx->queue->queuedata; + struct nvme_loop_queue *queue = hctx->driver_data; + struct request *req = bd->rq; + struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); + bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); + blk_status_t ret; + + if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready)) + return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req); + + ret = nvme_setup_cmd(ns, req, &iod->cmd); + if (ret) + return ret; + + blk_mq_start_request(req); + iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; + iod->req.port = queue->ctrl->port; + if (!nvmet_req_init(&iod->req, &queue->nvme_cq, + &queue->nvme_sq, &nvme_loop_ops)) + return BLK_STS_OK; + + if (blk_rq_nr_phys_segments(req)) { + iod->sg_table.sgl = iod->first_sgl; + if (sg_alloc_table_chained(&iod->sg_table, + blk_rq_nr_phys_segments(req), + iod->sg_table.sgl)) + return BLK_STS_RESOURCE; + + iod->req.sg = iod->sg_table.sgl; + iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); + iod->req.transfer_len = blk_rq_payload_bytes(req); + } + + schedule_work(&iod->work); + return BLK_STS_OK; +} + +static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) +{ + struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); + struct nvme_loop_queue *queue = &ctrl->queues[0]; + struct nvme_loop_iod *iod = &ctrl->async_event_iod; + + memset(&iod->cmd, 0, sizeof(iod->cmd)); + iod->cmd.common.opcode = nvme_admin_async_event; + iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; + iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; + + if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, + &nvme_loop_ops)) { + dev_err(ctrl->ctrl.device, "failed async event work\n"); + return; + } + + schedule_work(&iod->work); +} + +static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, + struct nvme_loop_iod *iod, unsigned int queue_idx) +{ + iod->req.cmd = &iod->cmd; + iod->req.rsp = &iod->rsp; + iod->queue = &ctrl->queues[queue_idx]; + INIT_WORK(&iod->work, nvme_loop_execute_work); + return 0; +} + +static int nvme_loop_init_request(struct blk_mq_tag_set *set, + struct request *req, unsigned int hctx_idx, + unsigned int numa_node) +{ + struct nvme_loop_ctrl *ctrl = set->driver_data; + + nvme_req(req)->ctrl = &ctrl->ctrl; + return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), + (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); +} + +static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_loop_ctrl *ctrl = data; + struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; + + BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); + + hctx->driver_data = queue; + return 0; +} + +static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_loop_ctrl *ctrl = data; + struct nvme_loop_queue *queue = &ctrl->queues[0]; + + BUG_ON(hctx_idx != 0); + + hctx->driver_data = queue; + return 0; +} + +static const struct blk_mq_ops nvme_loop_mq_ops = { + .queue_rq = nvme_loop_queue_rq, + .complete = nvme_loop_complete_rq, + .init_request = nvme_loop_init_request, + .init_hctx = nvme_loop_init_hctx, + .timeout = nvme_loop_timeout, +}; + +static const struct blk_mq_ops nvme_loop_admin_mq_ops = { + .queue_rq = nvme_loop_queue_rq, + .complete = nvme_loop_complete_rq, + .init_request = nvme_loop_init_request, + .init_hctx = nvme_loop_init_admin_hctx, + .timeout = nvme_loop_timeout, +}; + +static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) +{ + if (!test_and_clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags)) + return; + nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); + blk_cleanup_queue(ctrl->ctrl.admin_q); + blk_mq_free_tag_set(&ctrl->admin_tag_set); +} + +static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) +{ + struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); + + if (list_empty(&ctrl->list)) + goto free_ctrl; + + mutex_lock(&nvme_loop_ctrl_mutex); + list_del(&ctrl->list); + mutex_unlock(&nvme_loop_ctrl_mutex); + + if (nctrl->tagset) { + blk_cleanup_queue(ctrl->ctrl.connect_q); + blk_mq_free_tag_set(&ctrl->tag_set); + } + kfree(ctrl->queues); + nvmf_free_options(nctrl->opts); +free_ctrl: + kfree(ctrl); +} + +static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) +{ + int i; + + for (i = 1; i < ctrl->ctrl.queue_count; i++) { + clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); + nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); + } + ctrl->ctrl.queue_count = 1; +} + +static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) +{ + struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; + unsigned int nr_io_queues; + int ret, i; + + nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); + ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); + if (ret || !nr_io_queues) + return ret; + + dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); + + for (i = 1; i <= nr_io_queues; i++) { + ctrl->queues[i].ctrl = ctrl; + ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); + if (ret) + goto out_destroy_queues; + + ctrl->ctrl.queue_count++; + } + + return 0; + +out_destroy_queues: + nvme_loop_destroy_io_queues(ctrl); + return ret; +} + +static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) +{ + int i, ret; + + for (i = 1; i < ctrl->ctrl.queue_count; i++) { + ret = nvmf_connect_io_queue(&ctrl->ctrl, i); + if (ret) + return ret; + set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); + } + + return 0; +} + +static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) +{ + int error; + + memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); + ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; + ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; + ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ + ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; + ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + + SG_CHUNK_SIZE * sizeof(struct scatterlist); + ctrl->admin_tag_set.driver_data = ctrl; + ctrl->admin_tag_set.nr_hw_queues = 1; + ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; + ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; + + ctrl->queues[0].ctrl = ctrl; + error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); + if (error) + return error; + ctrl->ctrl.queue_count = 1; + + error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); + if (error) + goto out_free_sq; + ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; + + ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); + if (IS_ERR(ctrl->ctrl.admin_q)) { + error = PTR_ERR(ctrl->ctrl.admin_q); + goto out_free_tagset; + } + + error = nvmf_connect_admin_queue(&ctrl->ctrl); + if (error) + goto out_cleanup_queue; + + set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); + + error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); + if (error) { + dev_err(ctrl->ctrl.device, + "prop_get NVME_REG_CAP failed\n"); + goto out_cleanup_queue; + } + + ctrl->ctrl.sqsize = + min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); + + error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); + if (error) + goto out_cleanup_queue; + + ctrl->ctrl.max_hw_sectors = + (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); + + error = nvme_init_identify(&ctrl->ctrl); + if (error) + goto out_cleanup_queue; + + return 0; + +out_cleanup_queue: + clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); + blk_cleanup_queue(ctrl->ctrl.admin_q); +out_free_tagset: + blk_mq_free_tag_set(&ctrl->admin_tag_set); +out_free_sq: + nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); + return error; +} + +static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) +{ + if (ctrl->ctrl.queue_count > 1) { + nvme_stop_queues(&ctrl->ctrl); + blk_mq_tagset_busy_iter(&ctrl->tag_set, + nvme_cancel_request, &ctrl->ctrl); + nvme_loop_destroy_io_queues(ctrl); + } + + if (ctrl->ctrl.state == NVME_CTRL_LIVE) + nvme_shutdown_ctrl(&ctrl->ctrl); + + blk_mq_quiesce_queue(ctrl->ctrl.admin_q); + blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, + nvme_cancel_request, &ctrl->ctrl); + blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); + nvme_loop_destroy_admin_queue(ctrl); +} + +static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) +{ + nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); +} + +static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) +{ + struct nvme_loop_ctrl *ctrl; + + mutex_lock(&nvme_loop_ctrl_mutex); + list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { + if (ctrl->ctrl.cntlid == nctrl->cntlid) + nvme_delete_ctrl(&ctrl->ctrl); + } + mutex_unlock(&nvme_loop_ctrl_mutex); +} + +static void nvme_loop_reset_ctrl_work(struct work_struct *work) +{ + struct nvme_loop_ctrl *ctrl = + container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); + bool changed; + int ret; + + nvme_stop_ctrl(&ctrl->ctrl); + nvme_loop_shutdown_ctrl(ctrl); + + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { + /* state change failure should never happen */ + WARN_ON_ONCE(1); + return; + } + + ret = nvme_loop_configure_admin_queue(ctrl); + if (ret) + goto out_disable; + + ret = nvme_loop_init_io_queues(ctrl); + if (ret) + goto out_destroy_admin; + + ret = nvme_loop_connect_io_queues(ctrl); + if (ret) + goto out_destroy_io; + + blk_mq_update_nr_hw_queues(&ctrl->tag_set, + ctrl->ctrl.queue_count - 1); + + changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); + WARN_ON_ONCE(!changed); + + nvme_start_ctrl(&ctrl->ctrl); + + return; + +out_destroy_io: + nvme_loop_destroy_io_queues(ctrl); +out_destroy_admin: + nvme_loop_destroy_admin_queue(ctrl); +out_disable: + dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); + nvme_uninit_ctrl(&ctrl->ctrl); + nvme_put_ctrl(&ctrl->ctrl); +} + +static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { + .name = "loop", + .module = THIS_MODULE, + .flags = NVME_F_FABRICS, + .reg_read32 = nvmf_reg_read32, + .reg_read64 = nvmf_reg_read64, + .reg_write32 = nvmf_reg_write32, + .free_ctrl = nvme_loop_free_ctrl, + .submit_async_event = nvme_loop_submit_async_event, + .delete_ctrl = nvme_loop_delete_ctrl_host, + .get_address = nvmf_get_address, +}; + +static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) +{ + int ret; + + ret = nvme_loop_init_io_queues(ctrl); + if (ret) + return ret; + + memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); + ctrl->tag_set.ops = &nvme_loop_mq_ops; + ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; + ctrl->tag_set.reserved_tags = 1; /* fabric connect */ + ctrl->tag_set.numa_node = NUMA_NO_NODE; + ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; + ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + + SG_CHUNK_SIZE * sizeof(struct scatterlist); + ctrl->tag_set.driver_data = ctrl; + ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; + ctrl->tag_set.timeout = NVME_IO_TIMEOUT; + ctrl->ctrl.tagset = &ctrl->tag_set; + + ret = blk_mq_alloc_tag_set(&ctrl->tag_set); + if (ret) + goto out_destroy_queues; + + ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); + if (IS_ERR(ctrl->ctrl.connect_q)) { + ret = PTR_ERR(ctrl->ctrl.connect_q); + goto out_free_tagset; + } + + ret = nvme_loop_connect_io_queues(ctrl); + if (ret) + goto out_cleanup_connect_q; + + return 0; + +out_cleanup_connect_q: + blk_cleanup_queue(ctrl->ctrl.connect_q); +out_free_tagset: + blk_mq_free_tag_set(&ctrl->tag_set); +out_destroy_queues: + nvme_loop_destroy_io_queues(ctrl); + return ret; +} + +static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) +{ + struct nvmet_port *p, *found = NULL; + + mutex_lock(&nvme_loop_ports_mutex); + list_for_each_entry(p, &nvme_loop_ports, entry) { + /* if no transport address is specified use the first port */ + if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && + strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) + continue; + found = p; + break; + } + mutex_unlock(&nvme_loop_ports_mutex); + return found; +} + +static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, + struct nvmf_ctrl_options *opts) +{ + struct nvme_loop_ctrl *ctrl; + bool changed; + int ret; + + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + return ERR_PTR(-ENOMEM); + ctrl->ctrl.opts = opts; + INIT_LIST_HEAD(&ctrl->list); + + INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); + + ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, + 0 /* no quirks, we're perfect! */); + if (ret) + goto out_put_ctrl; + + ret = -ENOMEM; + + ctrl->ctrl.sqsize = opts->queue_size - 1; + ctrl->ctrl.kato = opts->kato; + ctrl->port = nvme_loop_find_port(&ctrl->ctrl); + + ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), + GFP_KERNEL); + if (!ctrl->queues) + goto out_uninit_ctrl; + + ret = nvme_loop_configure_admin_queue(ctrl); + if (ret) + goto out_free_queues; + + if (opts->queue_size > ctrl->ctrl.maxcmd) { + /* warn if maxcmd is lower than queue_size */ + dev_warn(ctrl->ctrl.device, + "queue_size %zu > ctrl maxcmd %u, clamping down\n", + opts->queue_size, ctrl->ctrl.maxcmd); + opts->queue_size = ctrl->ctrl.maxcmd; + } + + if (opts->nr_io_queues) { + ret = nvme_loop_create_io_queues(ctrl); + if (ret) + goto out_remove_admin_queue; + } + + nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); + + dev_info(ctrl->ctrl.device, + "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); + + nvme_get_ctrl(&ctrl->ctrl); + + changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); + WARN_ON_ONCE(!changed); + + mutex_lock(&nvme_loop_ctrl_mutex); + list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); + mutex_unlock(&nvme_loop_ctrl_mutex); + + nvme_start_ctrl(&ctrl->ctrl); + + return &ctrl->ctrl; + +out_remove_admin_queue: + nvme_loop_destroy_admin_queue(ctrl); +out_free_queues: + kfree(ctrl->queues); +out_uninit_ctrl: + nvme_uninit_ctrl(&ctrl->ctrl); +out_put_ctrl: + nvme_put_ctrl(&ctrl->ctrl); + if (ret > 0) + ret = -EIO; + return ERR_PTR(ret); +} + +static int nvme_loop_add_port(struct nvmet_port *port) +{ + mutex_lock(&nvme_loop_ports_mutex); + list_add_tail(&port->entry, &nvme_loop_ports); + mutex_unlock(&nvme_loop_ports_mutex); + return 0; +} + +static void nvme_loop_remove_port(struct nvmet_port *port) +{ + mutex_lock(&nvme_loop_ports_mutex); + list_del_init(&port->entry); + mutex_unlock(&nvme_loop_ports_mutex); + + /* + * Ensure any ctrls that are in the process of being + * deleted are in fact deleted before we return + * and free the port. This is to prevent active + * ctrls from using a port after it's freed. + */ + flush_workqueue(nvme_delete_wq); +} + +static const struct nvmet_fabrics_ops nvme_loop_ops = { + .owner = THIS_MODULE, + .type = NVMF_TRTYPE_LOOP, + .add_port = nvme_loop_add_port, + .remove_port = nvme_loop_remove_port, + .queue_response = nvme_loop_queue_response, + .delete_ctrl = nvme_loop_delete_ctrl, +}; + +static struct nvmf_transport_ops nvme_loop_transport = { + .name = "loop", + .module = THIS_MODULE, + .create_ctrl = nvme_loop_create_ctrl, + .allowed_opts = NVMF_OPT_TRADDR, +}; + +static int __init nvme_loop_init_module(void) +{ + int ret; + + ret = nvmet_register_transport(&nvme_loop_ops); + if (ret) + return ret; + + ret = nvmf_register_transport(&nvme_loop_transport); + if (ret) + nvmet_unregister_transport(&nvme_loop_ops); + + return ret; +} + +static void __exit nvme_loop_cleanup_module(void) +{ + struct nvme_loop_ctrl *ctrl, *next; + + nvmf_unregister_transport(&nvme_loop_transport); + nvmet_unregister_transport(&nvme_loop_ops); + + mutex_lock(&nvme_loop_ctrl_mutex); + list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) + nvme_delete_ctrl(&ctrl->ctrl); + mutex_unlock(&nvme_loop_ctrl_mutex); + + flush_workqueue(nvme_delete_wq); +} + +module_init(nvme_loop_init_module); +module_exit(nvme_loop_cleanup_module); + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h new file mode 100644 index 000000000..ec9af4ee0 --- /dev/null +++ b/drivers/nvme/target/nvmet.h @@ -0,0 +1,442 @@ +/* + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef _NVMET_H +#define _NVMET_H + +#include <linux/dma-mapping.h> +#include <linux/types.h> +#include <linux/device.h> +#include <linux/kref.h> +#include <linux/percpu-refcount.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/uuid.h> +#include <linux/nvme.h> +#include <linux/configfs.h> +#include <linux/rcupdate.h> +#include <linux/blkdev.h> + +#define NVMET_ASYNC_EVENTS 4 +#define NVMET_ERROR_LOG_SLOTS 128 + +/* + * Supported optional AENs: + */ +#define NVMET_AEN_CFG_OPTIONAL \ + (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_ANA_CHANGE) + +/* + * Plus mandatory SMART AENs (we'll never send them, but allow enabling them): + */ +#define NVMET_AEN_CFG_ALL \ + (NVME_SMART_CRIT_SPARE | NVME_SMART_CRIT_TEMPERATURE | \ + NVME_SMART_CRIT_RELIABILITY | NVME_SMART_CRIT_MEDIA | \ + NVME_SMART_CRIT_VOLATILE_MEMORY | NVMET_AEN_CFG_OPTIONAL) + +/* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM + * The 16 bit shift is to set IATTR bit to 1, which means offending + * offset starts in the data section of connect() + */ +#define IPO_IATTR_CONNECT_DATA(x) \ + (cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x)))) +#define IPO_IATTR_CONNECT_SQE(x) \ + (cpu_to_le32(offsetof(struct nvmf_connect_command, x))) + +struct nvmet_ns { + struct list_head dev_link; + struct percpu_ref ref; + struct block_device *bdev; + struct file *file; + bool readonly; + u32 nsid; + u32 blksize_shift; + loff_t size; + u8 nguid[16]; + uuid_t uuid; + u32 anagrpid; + + bool buffered_io; + bool enabled; + struct nvmet_subsys *subsys; + const char *device_path; + + struct config_group device_group; + struct config_group group; + + struct completion disable_done; + mempool_t *bvec_pool; + struct kmem_cache *bvec_cache; +}; + +static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item) +{ + return container_of(to_config_group(item), struct nvmet_ns, group); +} + +struct nvmet_cq { + u16 qid; + u16 size; +}; + +struct nvmet_sq { + struct nvmet_ctrl *ctrl; + struct percpu_ref ref; + u16 qid; + u16 size; + u32 sqhd; + struct completion free_done; + struct completion confirm_done; +}; + +struct nvmet_ana_group { + struct config_group group; + struct nvmet_port *port; + u32 grpid; +}; + +static inline struct nvmet_ana_group *to_ana_group(struct config_item *item) +{ + return container_of(to_config_group(item), struct nvmet_ana_group, + group); +} + +/** + * struct nvmet_port - Common structure to keep port + * information for the target. + * @entry: Entry into referrals or transport list. + * @disc_addr: Address information is stored in a format defined + * for a discovery log page entry. + * @group: ConfigFS group for this element's folder. + * @priv: Private data for the transport. + */ +struct nvmet_port { + struct list_head entry; + struct nvmf_disc_rsp_page_entry disc_addr; + struct config_group group; + struct config_group subsys_group; + struct list_head subsystems; + struct config_group referrals_group; + struct list_head referrals; + struct config_group ana_groups_group; + struct nvmet_ana_group ana_default_group; + enum nvme_ana_state *ana_state; + void *priv; + bool enabled; + int inline_data_size; +}; + +static inline struct nvmet_port *to_nvmet_port(struct config_item *item) +{ + return container_of(to_config_group(item), struct nvmet_port, + group); +} + +static inline struct nvmet_port *ana_groups_to_port( + struct config_item *item) +{ + return container_of(to_config_group(item), struct nvmet_port, + ana_groups_group); +} + +struct nvmet_ctrl { + struct nvmet_subsys *subsys; + struct nvmet_cq **cqs; + struct nvmet_sq **sqs; + + struct mutex lock; + u64 cap; + u32 cc; + u32 csts; + + uuid_t hostid; + u16 cntlid; + u32 kato; + + struct nvmet_port *port; + + u32 aen_enabled; + unsigned long aen_masked; + struct nvmet_req *async_event_cmds[NVMET_ASYNC_EVENTS]; + unsigned int nr_async_event_cmds; + struct list_head async_events; + struct work_struct async_event_work; + + struct list_head subsys_entry; + struct kref ref; + struct delayed_work ka_work; + struct work_struct fatal_err_work; + + const struct nvmet_fabrics_ops *ops; + + __le32 *changed_ns_list; + u32 nr_changed_ns; + + char subsysnqn[NVMF_NQN_FIELD_LEN]; + char hostnqn[NVMF_NQN_FIELD_LEN]; +}; + +struct nvmet_subsys { + enum nvme_subsys_type type; + + struct mutex lock; + struct kref ref; + + struct list_head namespaces; + unsigned int nr_namespaces; + unsigned int max_nsid; + + struct list_head ctrls; + + struct list_head hosts; + bool allow_any_host; + + u16 max_qid; + + u64 ver; + u64 serial; + char *subsysnqn; + + struct config_group group; + + struct config_group namespaces_group; + struct config_group allowed_hosts_group; +}; + +static inline struct nvmet_subsys *to_subsys(struct config_item *item) +{ + return container_of(to_config_group(item), struct nvmet_subsys, group); +} + +static inline struct nvmet_subsys *namespaces_to_subsys( + struct config_item *item) +{ + return container_of(to_config_group(item), struct nvmet_subsys, + namespaces_group); +} + +struct nvmet_host { + struct config_group group; +}; + +static inline struct nvmet_host *to_host(struct config_item *item) +{ + return container_of(to_config_group(item), struct nvmet_host, group); +} + +static inline char *nvmet_host_name(struct nvmet_host *host) +{ + return config_item_name(&host->group.cg_item); +} + +struct nvmet_host_link { + struct list_head entry; + struct nvmet_host *host; +}; + +struct nvmet_subsys_link { + struct list_head entry; + struct nvmet_subsys *subsys; +}; + +struct nvmet_req; +struct nvmet_fabrics_ops { + struct module *owner; + unsigned int type; + unsigned int msdbd; + bool has_keyed_sgls : 1; + void (*queue_response)(struct nvmet_req *req); + int (*add_port)(struct nvmet_port *port); + void (*remove_port)(struct nvmet_port *port); + void (*delete_ctrl)(struct nvmet_ctrl *ctrl); + void (*disc_traddr)(struct nvmet_req *req, + struct nvmet_port *port, char *traddr); +}; + +#define NVMET_MAX_INLINE_BIOVEC 8 + +struct nvmet_req { + struct nvme_command *cmd; + struct nvme_completion *rsp; + struct nvmet_sq *sq; + struct nvmet_cq *cq; + struct nvmet_ns *ns; + struct scatterlist *sg; + struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC]; + union { + struct { + struct bio inline_bio; + } b; + struct { + bool mpool_alloc; + struct kiocb iocb; + struct bio_vec *bvec; + struct work_struct work; + } f; + }; + int sg_cnt; + /* data length as parsed from the command: */ + size_t data_len; + /* data length as parsed from the SGL descriptor: */ + size_t transfer_len; + + struct nvmet_port *port; + + void (*execute)(struct nvmet_req *req); + const struct nvmet_fabrics_ops *ops; +}; + +extern struct workqueue_struct *buffered_io_wq; + +static inline void nvmet_set_status(struct nvmet_req *req, u16 status) +{ + req->rsp->status = cpu_to_le16(status << 1); +} + +static inline void nvmet_set_result(struct nvmet_req *req, u32 result) +{ + req->rsp->result.u32 = cpu_to_le32(result); +} + +/* + * NVMe command writes actually are DMA reads for us on the target side. + */ +static inline enum dma_data_direction +nvmet_data_dir(struct nvmet_req *req) +{ + return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; +} + +struct nvmet_async_event { + struct list_head entry; + u8 event_type; + u8 event_info; + u8 log_page; +}; + +u16 nvmet_parse_connect_cmd(struct nvmet_req *req); +u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req); +u16 nvmet_file_parse_io_cmd(struct nvmet_req *req); +u16 nvmet_parse_admin_cmd(struct nvmet_req *req); +u16 nvmet_parse_discovery_cmd(struct nvmet_req *req); +u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req); + +bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, + struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops); +void nvmet_req_uninit(struct nvmet_req *req); +void nvmet_req_execute(struct nvmet_req *req); +void nvmet_req_complete(struct nvmet_req *req, u16 status); + +void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid, + u16 size); +void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid, + u16 size); +void nvmet_sq_destroy(struct nvmet_sq *sq); +int nvmet_sq_init(struct nvmet_sq *sq); + +void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl); + +void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new); +u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, + struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp); +u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid, + struct nvmet_req *req, struct nvmet_ctrl **ret); +void nvmet_ctrl_put(struct nvmet_ctrl *ctrl); +u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd); + +struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, + enum nvme_subsys_type type); +void nvmet_subsys_put(struct nvmet_subsys *subsys); +void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys); + +struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid); +void nvmet_put_namespace(struct nvmet_ns *ns); +int nvmet_ns_enable(struct nvmet_ns *ns); +void nvmet_ns_disable(struct nvmet_ns *ns); +struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid); +void nvmet_ns_free(struct nvmet_ns *ns); + +void nvmet_send_ana_event(struct nvmet_subsys *subsys, + struct nvmet_port *port); +void nvmet_port_send_ana_event(struct nvmet_port *port); + +int nvmet_register_transport(const struct nvmet_fabrics_ops *ops); +void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops); + +int nvmet_enable_port(struct nvmet_port *port); +void nvmet_disable_port(struct nvmet_port *port); + +void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port); +void nvmet_referral_disable(struct nvmet_port *port); + +u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf, + size_t len); +u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, + size_t len); +u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len); + +u32 nvmet_get_log_page_len(struct nvme_command *cmd); + +#define NVMET_QUEUE_SIZE 1024 +#define NVMET_NR_QUEUES 128 +#define NVMET_MAX_CMD NVMET_QUEUE_SIZE + +/* + * Nice round number that makes a list of nsids fit into a page. + * Should become tunable at some point in the future. + */ +#define NVMET_MAX_NAMESPACES 1024 + +/* + * 0 is not a valid ANA group ID, so we start numbering at 1. + * + * ANA Group 1 exists without manual intervention, has namespaces assigned to it + * by default, and is available in an optimized state through all ports. + */ +#define NVMET_MAX_ANAGRPS 128 +#define NVMET_DEFAULT_ANA_GRPID 1 + +#define NVMET_KAS 10 +#define NVMET_DISC_KATO 120 + +int __init nvmet_init_configfs(void); +void __exit nvmet_exit_configfs(void); + +int __init nvmet_init_discovery(void); +void nvmet_exit_discovery(void); + +extern struct nvmet_subsys *nvmet_disc_subsys; +extern u64 nvmet_genctr; +extern struct rw_semaphore nvmet_config_sem; + +extern u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1]; +extern u64 nvmet_ana_chgcnt; +extern struct rw_semaphore nvmet_ana_sem; + +bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys, + const char *hostnqn); + +int nvmet_bdev_ns_enable(struct nvmet_ns *ns); +int nvmet_file_ns_enable(struct nvmet_ns *ns); +void nvmet_bdev_ns_disable(struct nvmet_ns *ns); +void nvmet_file_ns_disable(struct nvmet_ns *ns); +u16 nvmet_bdev_flush(struct nvmet_req *req); +u16 nvmet_file_flush(struct nvmet_req *req); +void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid); + +static inline u32 nvmet_rw_len(struct nvmet_req *req) +{ + return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) << + req->ns->blksize_shift; +} +#endif /* _NVMET_H */ diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c new file mode 100644 index 000000000..cfd26437a --- /dev/null +++ b/drivers/nvme/target/rdma.c @@ -0,0 +1,1691 @@ +/* + * NVMe over Fabrics RDMA target. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/atomic.h> +#include <linux/ctype.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/nvme.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/wait.h> +#include <linux/inet.h> +#include <asm/unaligned.h> + +#include <rdma/ib_verbs.h> +#include <rdma/rdma_cm.h> +#include <rdma/rw.h> + +#include <linux/nvme-rdma.h> +#include "nvmet.h" + +/* + * We allow at least 1 page, up to 4 SGEs, and up to 16KB of inline data + */ +#define NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE PAGE_SIZE +#define NVMET_RDMA_MAX_INLINE_SGE 4 +#define NVMET_RDMA_MAX_INLINE_DATA_SIZE max_t(int, SZ_16K, PAGE_SIZE) + +struct nvmet_rdma_cmd { + struct ib_sge sge[NVMET_RDMA_MAX_INLINE_SGE + 1]; + struct ib_cqe cqe; + struct ib_recv_wr wr; + struct scatterlist inline_sg[NVMET_RDMA_MAX_INLINE_SGE]; + struct nvme_command *nvme_cmd; + struct nvmet_rdma_queue *queue; +}; + +enum { + NVMET_RDMA_REQ_INLINE_DATA = (1 << 0), + NVMET_RDMA_REQ_INVALIDATE_RKEY = (1 << 1), +}; + +struct nvmet_rdma_rsp { + struct ib_sge send_sge; + struct ib_cqe send_cqe; + struct ib_send_wr send_wr; + + struct nvmet_rdma_cmd *cmd; + struct nvmet_rdma_queue *queue; + + struct ib_cqe read_cqe; + struct rdma_rw_ctx rw; + + struct nvmet_req req; + + bool allocated; + u8 n_rdma; + u32 flags; + u32 invalidate_rkey; + + struct list_head wait_list; + struct list_head free_list; +}; + +enum nvmet_rdma_queue_state { + NVMET_RDMA_Q_CONNECTING, + NVMET_RDMA_Q_LIVE, + NVMET_RDMA_Q_DISCONNECTING, +}; + +struct nvmet_rdma_queue { + struct rdma_cm_id *cm_id; + struct ib_qp *qp; + struct nvmet_port *port; + struct ib_cq *cq; + atomic_t sq_wr_avail; + struct nvmet_rdma_device *dev; + spinlock_t state_lock; + enum nvmet_rdma_queue_state state; + struct nvmet_cq nvme_cq; + struct nvmet_sq nvme_sq; + + struct nvmet_rdma_rsp *rsps; + struct list_head free_rsps; + spinlock_t rsps_lock; + struct nvmet_rdma_cmd *cmds; + + struct work_struct release_work; + struct list_head rsp_wait_list; + struct list_head rsp_wr_wait_list; + spinlock_t rsp_wr_wait_lock; + + int idx; + int host_qid; + int recv_queue_size; + int send_queue_size; + + struct list_head queue_list; +}; + +struct nvmet_rdma_device { + struct ib_device *device; + struct ib_pd *pd; + struct ib_srq *srq; + struct nvmet_rdma_cmd *srq_cmds; + size_t srq_size; + struct kref ref; + struct list_head entry; + int inline_data_size; + int inline_page_count; +}; + +static bool nvmet_rdma_use_srq; +module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444); +MODULE_PARM_DESC(use_srq, "Use shared receive queue."); + +static DEFINE_IDA(nvmet_rdma_queue_ida); +static LIST_HEAD(nvmet_rdma_queue_list); +static DEFINE_MUTEX(nvmet_rdma_queue_mutex); + +static LIST_HEAD(device_list); +static DEFINE_MUTEX(device_list_mutex); + +static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp); +static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc); +static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc); +static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc); +static void nvmet_rdma_qp_event(struct ib_event *event, void *priv); +static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue); +static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_rsp *r); +static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_rsp *r); + +static const struct nvmet_fabrics_ops nvmet_rdma_ops; + +static int num_pages(int len) +{ + return 1 + (((len - 1) & PAGE_MASK) >> PAGE_SHIFT); +} + +/* XXX: really should move to a generic header sooner or later.. */ +static inline u32 get_unaligned_le24(const u8 *p) +{ + return (u32)p[0] | (u32)p[1] << 8 | (u32)p[2] << 16; +} + +static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp) +{ + return nvme_is_write(rsp->req.cmd) && + rsp->req.transfer_len && + !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA); +} + +static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp) +{ + return !nvme_is_write(rsp->req.cmd) && + rsp->req.transfer_len && + !rsp->req.rsp->status && + !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA); +} + +static inline struct nvmet_rdma_rsp * +nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue) +{ + struct nvmet_rdma_rsp *rsp; + unsigned long flags; + + spin_lock_irqsave(&queue->rsps_lock, flags); + rsp = list_first_entry_or_null(&queue->free_rsps, + struct nvmet_rdma_rsp, free_list); + if (likely(rsp)) + list_del(&rsp->free_list); + spin_unlock_irqrestore(&queue->rsps_lock, flags); + + if (unlikely(!rsp)) { + int ret; + + rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); + if (unlikely(!rsp)) + return NULL; + ret = nvmet_rdma_alloc_rsp(queue->dev, rsp); + if (unlikely(ret)) { + kfree(rsp); + return NULL; + } + + rsp->allocated = true; + } + + return rsp; +} + +static inline void +nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp) +{ + unsigned long flags; + + if (unlikely(rsp->allocated)) { + nvmet_rdma_free_rsp(rsp->queue->dev, rsp); + kfree(rsp); + return; + } + + spin_lock_irqsave(&rsp->queue->rsps_lock, flags); + list_add_tail(&rsp->free_list, &rsp->queue->free_rsps); + spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags); +} + +static void nvmet_rdma_free_inline_pages(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_cmd *c) +{ + struct scatterlist *sg; + struct ib_sge *sge; + int i; + + if (!ndev->inline_data_size) + return; + + sg = c->inline_sg; + sge = &c->sge[1]; + + for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) { + if (sge->length) + ib_dma_unmap_page(ndev->device, sge->addr, + sge->length, DMA_FROM_DEVICE); + if (sg_page(sg)) + __free_page(sg_page(sg)); + } +} + +static int nvmet_rdma_alloc_inline_pages(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_cmd *c) +{ + struct scatterlist *sg; + struct ib_sge *sge; + struct page *pg; + int len; + int i; + + if (!ndev->inline_data_size) + return 0; + + sg = c->inline_sg; + sg_init_table(sg, ndev->inline_page_count); + sge = &c->sge[1]; + len = ndev->inline_data_size; + + for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) { + pg = alloc_page(GFP_KERNEL); + if (!pg) + goto out_err; + sg_assign_page(sg, pg); + sge->addr = ib_dma_map_page(ndev->device, + pg, 0, PAGE_SIZE, DMA_FROM_DEVICE); + if (ib_dma_mapping_error(ndev->device, sge->addr)) + goto out_err; + sge->length = min_t(int, len, PAGE_SIZE); + sge->lkey = ndev->pd->local_dma_lkey; + len -= sge->length; + } + + return 0; +out_err: + for (; i >= 0; i--, sg--, sge--) { + if (sge->length) + ib_dma_unmap_page(ndev->device, sge->addr, + sge->length, DMA_FROM_DEVICE); + if (sg_page(sg)) + __free_page(sg_page(sg)); + } + return -ENOMEM; +} + +static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_cmd *c, bool admin) +{ + /* NVMe command / RDMA RECV */ + c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL); + if (!c->nvme_cmd) + goto out; + + c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd, + sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); + if (ib_dma_mapping_error(ndev->device, c->sge[0].addr)) + goto out_free_cmd; + + c->sge[0].length = sizeof(*c->nvme_cmd); + c->sge[0].lkey = ndev->pd->local_dma_lkey; + + if (!admin && nvmet_rdma_alloc_inline_pages(ndev, c)) + goto out_unmap_cmd; + + c->cqe.done = nvmet_rdma_recv_done; + + c->wr.wr_cqe = &c->cqe; + c->wr.sg_list = c->sge; + c->wr.num_sge = admin ? 1 : ndev->inline_page_count + 1; + + return 0; + +out_unmap_cmd: + ib_dma_unmap_single(ndev->device, c->sge[0].addr, + sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); +out_free_cmd: + kfree(c->nvme_cmd); + +out: + return -ENOMEM; +} + +static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_cmd *c, bool admin) +{ + if (!admin) + nvmet_rdma_free_inline_pages(ndev, c); + ib_dma_unmap_single(ndev->device, c->sge[0].addr, + sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); + kfree(c->nvme_cmd); +} + +static struct nvmet_rdma_cmd * +nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev, + int nr_cmds, bool admin) +{ + struct nvmet_rdma_cmd *cmds; + int ret = -EINVAL, i; + + cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL); + if (!cmds) + goto out; + + for (i = 0; i < nr_cmds; i++) { + ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin); + if (ret) + goto out_free; + } + + return cmds; + +out_free: + while (--i >= 0) + nvmet_rdma_free_cmd(ndev, cmds + i, admin); + kfree(cmds); +out: + return ERR_PTR(ret); +} + +static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin) +{ + int i; + + for (i = 0; i < nr_cmds; i++) + nvmet_rdma_free_cmd(ndev, cmds + i, admin); + kfree(cmds); +} + +static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_rsp *r) +{ + /* NVMe CQE / RDMA SEND */ + r->req.rsp = kmalloc(sizeof(*r->req.rsp), GFP_KERNEL); + if (!r->req.rsp) + goto out; + + r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.rsp, + sizeof(*r->req.rsp), DMA_TO_DEVICE); + if (ib_dma_mapping_error(ndev->device, r->send_sge.addr)) + goto out_free_rsp; + + r->send_sge.length = sizeof(*r->req.rsp); + r->send_sge.lkey = ndev->pd->local_dma_lkey; + + r->send_cqe.done = nvmet_rdma_send_done; + + r->send_wr.wr_cqe = &r->send_cqe; + r->send_wr.sg_list = &r->send_sge; + r->send_wr.num_sge = 1; + r->send_wr.send_flags = IB_SEND_SIGNALED; + + /* Data In / RDMA READ */ + r->read_cqe.done = nvmet_rdma_read_data_done; + return 0; + +out_free_rsp: + kfree(r->req.rsp); +out: + return -ENOMEM; +} + +static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_rsp *r) +{ + ib_dma_unmap_single(ndev->device, r->send_sge.addr, + sizeof(*r->req.rsp), DMA_TO_DEVICE); + kfree(r->req.rsp); +} + +static int +nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue) +{ + struct nvmet_rdma_device *ndev = queue->dev; + int nr_rsps = queue->recv_queue_size * 2; + int ret = -EINVAL, i; + + queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp), + GFP_KERNEL); + if (!queue->rsps) + goto out; + + for (i = 0; i < nr_rsps; i++) { + struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; + + ret = nvmet_rdma_alloc_rsp(ndev, rsp); + if (ret) + goto out_free; + + list_add_tail(&rsp->free_list, &queue->free_rsps); + } + + return 0; + +out_free: + while (--i >= 0) { + struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; + + list_del(&rsp->free_list); + nvmet_rdma_free_rsp(ndev, rsp); + } + kfree(queue->rsps); +out: + return ret; +} + +static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue) +{ + struct nvmet_rdma_device *ndev = queue->dev; + int i, nr_rsps = queue->recv_queue_size * 2; + + for (i = 0; i < nr_rsps; i++) { + struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; + + list_del(&rsp->free_list); + nvmet_rdma_free_rsp(ndev, rsp); + } + kfree(queue->rsps); +} + +static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev, + struct nvmet_rdma_cmd *cmd) +{ + int ret; + + ib_dma_sync_single_for_device(ndev->device, + cmd->sge[0].addr, cmd->sge[0].length, + DMA_FROM_DEVICE); + + if (ndev->srq) + ret = ib_post_srq_recv(ndev->srq, &cmd->wr, NULL); + else + ret = ib_post_recv(cmd->queue->qp, &cmd->wr, NULL); + + if (unlikely(ret)) + pr_err("post_recv cmd failed\n"); + + return ret; +} + +static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue) +{ + spin_lock(&queue->rsp_wr_wait_lock); + while (!list_empty(&queue->rsp_wr_wait_list)) { + struct nvmet_rdma_rsp *rsp; + bool ret; + + rsp = list_entry(queue->rsp_wr_wait_list.next, + struct nvmet_rdma_rsp, wait_list); + list_del(&rsp->wait_list); + + spin_unlock(&queue->rsp_wr_wait_lock); + ret = nvmet_rdma_execute_command(rsp); + spin_lock(&queue->rsp_wr_wait_lock); + + if (!ret) { + list_add(&rsp->wait_list, &queue->rsp_wr_wait_list); + break; + } + } + spin_unlock(&queue->rsp_wr_wait_lock); +} + + +static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp) +{ + struct nvmet_rdma_queue *queue = rsp->queue; + + atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail); + + if (rsp->n_rdma) { + rdma_rw_ctx_destroy(&rsp->rw, queue->qp, + queue->cm_id->port_num, rsp->req.sg, + rsp->req.sg_cnt, nvmet_data_dir(&rsp->req)); + } + + if (rsp->req.sg != rsp->cmd->inline_sg) + sgl_free(rsp->req.sg); + + if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list))) + nvmet_rdma_process_wr_wait_list(queue); + + nvmet_rdma_put_rsp(rsp); +} + +static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue) +{ + if (queue->nvme_sq.ctrl) { + nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl); + } else { + /* + * we didn't setup the controller yet in case + * of admin connect error, just disconnect and + * cleanup the queue + */ + nvmet_rdma_queue_disconnect(queue); + } +} + +static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct nvmet_rdma_rsp *rsp = + container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe); + struct nvmet_rdma_queue *queue = cq->cq_context; + + nvmet_rdma_release_rsp(rsp); + + if (unlikely(wc->status != IB_WC_SUCCESS && + wc->status != IB_WC_WR_FLUSH_ERR)) { + pr_err("SEND for CQE 0x%p failed with status %s (%d).\n", + wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status); + nvmet_rdma_error_comp(queue); + } +} + +static void nvmet_rdma_queue_response(struct nvmet_req *req) +{ + struct nvmet_rdma_rsp *rsp = + container_of(req, struct nvmet_rdma_rsp, req); + struct rdma_cm_id *cm_id = rsp->queue->cm_id; + struct ib_send_wr *first_wr; + + if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) { + rsp->send_wr.opcode = IB_WR_SEND_WITH_INV; + rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey; + } else { + rsp->send_wr.opcode = IB_WR_SEND; + } + + if (nvmet_rdma_need_data_out(rsp)) + first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp, + cm_id->port_num, NULL, &rsp->send_wr); + else + first_wr = &rsp->send_wr; + + nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd); + + ib_dma_sync_single_for_device(rsp->queue->dev->device, + rsp->send_sge.addr, rsp->send_sge.length, + DMA_TO_DEVICE); + + if (unlikely(ib_post_send(cm_id->qp, first_wr, NULL))) { + pr_err("sending cmd response failed\n"); + nvmet_rdma_release_rsp(rsp); + } +} + +static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct nvmet_rdma_rsp *rsp = + container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe); + struct nvmet_rdma_queue *queue = cq->cq_context; + + WARN_ON(rsp->n_rdma <= 0); + atomic_add(rsp->n_rdma, &queue->sq_wr_avail); + rdma_rw_ctx_destroy(&rsp->rw, queue->qp, + queue->cm_id->port_num, rsp->req.sg, + rsp->req.sg_cnt, nvmet_data_dir(&rsp->req)); + rsp->n_rdma = 0; + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + nvmet_req_uninit(&rsp->req); + nvmet_rdma_release_rsp(rsp); + if (wc->status != IB_WC_WR_FLUSH_ERR) { + pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n", + wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status); + nvmet_rdma_error_comp(queue); + } + return; + } + + nvmet_req_execute(&rsp->req); +} + +static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len, + u64 off) +{ + int sg_count = num_pages(len); + struct scatterlist *sg; + int i; + + sg = rsp->cmd->inline_sg; + for (i = 0; i < sg_count; i++, sg++) { + if (i < sg_count - 1) + sg_unmark_end(sg); + else + sg_mark_end(sg); + sg->offset = off; + sg->length = min_t(int, len, PAGE_SIZE - off); + len -= sg->length; + if (!i) + off = 0; + } + + rsp->req.sg = rsp->cmd->inline_sg; + rsp->req.sg_cnt = sg_count; +} + +static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp) +{ + struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl; + u64 off = le64_to_cpu(sgl->addr); + u32 len = le32_to_cpu(sgl->length); + + if (!nvme_is_write(rsp->req.cmd)) + return NVME_SC_INVALID_FIELD | NVME_SC_DNR; + + if (off + len > rsp->queue->dev->inline_data_size) { + pr_err("invalid inline data offset!\n"); + return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR; + } + + /* no data command? */ + if (!len) + return 0; + + nvmet_rdma_use_inline_sg(rsp, len, off); + rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA; + rsp->req.transfer_len += len; + return 0; +} + +static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp, + struct nvme_keyed_sgl_desc *sgl, bool invalidate) +{ + struct rdma_cm_id *cm_id = rsp->queue->cm_id; + u64 addr = le64_to_cpu(sgl->addr); + u32 len = get_unaligned_le24(sgl->length); + u32 key = get_unaligned_le32(sgl->key); + int ret; + + /* no data command? */ + if (!len) + return 0; + + rsp->req.sg = sgl_alloc(len, GFP_KERNEL, &rsp->req.sg_cnt); + if (!rsp->req.sg) + return NVME_SC_INTERNAL; + + ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num, + rsp->req.sg, rsp->req.sg_cnt, 0, addr, key, + nvmet_data_dir(&rsp->req)); + if (ret < 0) + return NVME_SC_INTERNAL; + rsp->req.transfer_len += len; + rsp->n_rdma += ret; + + if (invalidate) { + rsp->invalidate_rkey = key; + rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY; + } + + return 0; +} + +static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp) +{ + struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl; + + switch (sgl->type >> 4) { + case NVME_SGL_FMT_DATA_DESC: + switch (sgl->type & 0xf) { + case NVME_SGL_FMT_OFFSET: + return nvmet_rdma_map_sgl_inline(rsp); + default: + pr_err("invalid SGL subtype: %#x\n", sgl->type); + return NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } + case NVME_KEY_SGL_FMT_DATA_DESC: + switch (sgl->type & 0xf) { + case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE: + return nvmet_rdma_map_sgl_keyed(rsp, sgl, true); + case NVME_SGL_FMT_ADDRESS: + return nvmet_rdma_map_sgl_keyed(rsp, sgl, false); + default: + pr_err("invalid SGL subtype: %#x\n", sgl->type); + return NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } + default: + pr_err("invalid SGL type: %#x\n", sgl->type); + return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR; + } +} + +static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp) +{ + struct nvmet_rdma_queue *queue = rsp->queue; + + if (unlikely(atomic_sub_return(1 + rsp->n_rdma, + &queue->sq_wr_avail) < 0)) { + pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n", + 1 + rsp->n_rdma, queue->idx, + queue->nvme_sq.ctrl->cntlid); + atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail); + return false; + } + + if (nvmet_rdma_need_data_in(rsp)) { + if (rdma_rw_ctx_post(&rsp->rw, queue->qp, + queue->cm_id->port_num, &rsp->read_cqe, NULL)) + nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR); + } else { + nvmet_req_execute(&rsp->req); + } + + return true; +} + +static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue, + struct nvmet_rdma_rsp *cmd) +{ + u16 status; + + ib_dma_sync_single_for_cpu(queue->dev->device, + cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length, + DMA_FROM_DEVICE); + ib_dma_sync_single_for_cpu(queue->dev->device, + cmd->send_sge.addr, cmd->send_sge.length, + DMA_TO_DEVICE); + + if (!nvmet_req_init(&cmd->req, &queue->nvme_cq, + &queue->nvme_sq, &nvmet_rdma_ops)) + return; + + status = nvmet_rdma_map_sgl(cmd); + if (status) + goto out_err; + + if (unlikely(!nvmet_rdma_execute_command(cmd))) { + spin_lock(&queue->rsp_wr_wait_lock); + list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list); + spin_unlock(&queue->rsp_wr_wait_lock); + } + + return; + +out_err: + nvmet_req_complete(&cmd->req, status); +} + +static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct nvmet_rdma_cmd *cmd = + container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe); + struct nvmet_rdma_queue *queue = cq->cq_context; + struct nvmet_rdma_rsp *rsp; + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + if (wc->status != IB_WC_WR_FLUSH_ERR) { + pr_err("RECV for CQE 0x%p failed with status %s (%d)\n", + wc->wr_cqe, ib_wc_status_msg(wc->status), + wc->status); + nvmet_rdma_error_comp(queue); + } + return; + } + + if (unlikely(wc->byte_len < sizeof(struct nvme_command))) { + pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n"); + nvmet_rdma_error_comp(queue); + return; + } + + cmd->queue = queue; + rsp = nvmet_rdma_get_rsp(queue); + if (unlikely(!rsp)) { + /* + * we get here only under memory pressure, + * silently drop and have the host retry + * as we can't even fail it. + */ + nvmet_rdma_post_recv(queue->dev, cmd); + return; + } + rsp->queue = queue; + rsp->cmd = cmd; + rsp->flags = 0; + rsp->req.cmd = cmd->nvme_cmd; + rsp->req.port = queue->port; + rsp->n_rdma = 0; + + if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) { + unsigned long flags; + + spin_lock_irqsave(&queue->state_lock, flags); + if (queue->state == NVMET_RDMA_Q_CONNECTING) + list_add_tail(&rsp->wait_list, &queue->rsp_wait_list); + else + nvmet_rdma_put_rsp(rsp); + spin_unlock_irqrestore(&queue->state_lock, flags); + return; + } + + nvmet_rdma_handle_command(queue, rsp); +} + +static void nvmet_rdma_destroy_srq(struct nvmet_rdma_device *ndev) +{ + if (!ndev->srq) + return; + + nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false); + ib_destroy_srq(ndev->srq); +} + +static int nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev) +{ + struct ib_srq_init_attr srq_attr = { NULL, }; + struct ib_srq *srq; + size_t srq_size; + int ret, i; + + srq_size = 4095; /* XXX: tune */ + + srq_attr.attr.max_wr = srq_size; + srq_attr.attr.max_sge = 1 + ndev->inline_page_count; + srq_attr.attr.srq_limit = 0; + srq_attr.srq_type = IB_SRQT_BASIC; + srq = ib_create_srq(ndev->pd, &srq_attr); + if (IS_ERR(srq)) { + /* + * If SRQs aren't supported we just go ahead and use normal + * non-shared receive queues. + */ + pr_info("SRQ requested but not supported.\n"); + return 0; + } + + ndev->srq_cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false); + if (IS_ERR(ndev->srq_cmds)) { + ret = PTR_ERR(ndev->srq_cmds); + goto out_destroy_srq; + } + + ndev->srq = srq; + ndev->srq_size = srq_size; + + for (i = 0; i < srq_size; i++) { + ret = nvmet_rdma_post_recv(ndev, &ndev->srq_cmds[i]); + if (ret) + goto out_free_cmds; + } + + return 0; + +out_free_cmds: + nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false); +out_destroy_srq: + ib_destroy_srq(srq); + return ret; +} + +static void nvmet_rdma_free_dev(struct kref *ref) +{ + struct nvmet_rdma_device *ndev = + container_of(ref, struct nvmet_rdma_device, ref); + + mutex_lock(&device_list_mutex); + list_del(&ndev->entry); + mutex_unlock(&device_list_mutex); + + nvmet_rdma_destroy_srq(ndev); + ib_dealloc_pd(ndev->pd); + + kfree(ndev); +} + +static struct nvmet_rdma_device * +nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id) +{ + struct nvmet_port *port = cm_id->context; + struct nvmet_rdma_device *ndev; + int inline_page_count; + int inline_sge_count; + int ret; + + mutex_lock(&device_list_mutex); + list_for_each_entry(ndev, &device_list, entry) { + if (ndev->device->node_guid == cm_id->device->node_guid && + kref_get_unless_zero(&ndev->ref)) + goto out_unlock; + } + + ndev = kzalloc(sizeof(*ndev), GFP_KERNEL); + if (!ndev) + goto out_err; + + inline_page_count = num_pages(port->inline_data_size); + inline_sge_count = max(cm_id->device->attrs.max_sge_rd, + cm_id->device->attrs.max_recv_sge) - 1; + if (inline_page_count > inline_sge_count) { + pr_warn("inline_data_size %d cannot be supported by device %s. Reducing to %lu.\n", + port->inline_data_size, cm_id->device->name, + inline_sge_count * PAGE_SIZE); + port->inline_data_size = inline_sge_count * PAGE_SIZE; + inline_page_count = inline_sge_count; + } + ndev->inline_data_size = port->inline_data_size; + ndev->inline_page_count = inline_page_count; + ndev->device = cm_id->device; + kref_init(&ndev->ref); + + ndev->pd = ib_alloc_pd(ndev->device, 0); + if (IS_ERR(ndev->pd)) + goto out_free_dev; + + if (nvmet_rdma_use_srq) { + ret = nvmet_rdma_init_srq(ndev); + if (ret) + goto out_free_pd; + } + + list_add(&ndev->entry, &device_list); +out_unlock: + mutex_unlock(&device_list_mutex); + pr_debug("added %s.\n", ndev->device->name); + return ndev; + +out_free_pd: + ib_dealloc_pd(ndev->pd); +out_free_dev: + kfree(ndev); +out_err: + mutex_unlock(&device_list_mutex); + return NULL; +} + +static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue) +{ + struct ib_qp_init_attr qp_attr; + struct nvmet_rdma_device *ndev = queue->dev; + int comp_vector, nr_cqe, ret, i; + + /* + * Spread the io queues across completion vectors, + * but still keep all admin queues on vector 0. + */ + comp_vector = !queue->host_qid ? 0 : + queue->idx % ndev->device->num_comp_vectors; + + /* + * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND. + */ + nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size; + + queue->cq = ib_alloc_cq(ndev->device, queue, + nr_cqe + 1, comp_vector, + IB_POLL_WORKQUEUE); + if (IS_ERR(queue->cq)) { + ret = PTR_ERR(queue->cq); + pr_err("failed to create CQ cqe= %d ret= %d\n", + nr_cqe + 1, ret); + goto out; + } + + memset(&qp_attr, 0, sizeof(qp_attr)); + qp_attr.qp_context = queue; + qp_attr.event_handler = nvmet_rdma_qp_event; + qp_attr.send_cq = queue->cq; + qp_attr.recv_cq = queue->cq; + qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; + qp_attr.qp_type = IB_QPT_RC; + /* +1 for drain */ + qp_attr.cap.max_send_wr = queue->send_queue_size + 1; + qp_attr.cap.max_rdma_ctxs = queue->send_queue_size; + qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd, + ndev->device->attrs.max_send_sge); + + if (ndev->srq) { + qp_attr.srq = ndev->srq; + } else { + /* +1 for drain */ + qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size; + qp_attr.cap.max_recv_sge = 1 + ndev->inline_page_count; + } + + ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr); + if (ret) { + pr_err("failed to create_qp ret= %d\n", ret); + goto err_destroy_cq; + } + queue->qp = queue->cm_id->qp; + + atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr); + + pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n", + __func__, queue->cq->cqe, qp_attr.cap.max_send_sge, + qp_attr.cap.max_send_wr, queue->cm_id); + + if (!ndev->srq) { + for (i = 0; i < queue->recv_queue_size; i++) { + queue->cmds[i].queue = queue; + ret = nvmet_rdma_post_recv(ndev, &queue->cmds[i]); + if (ret) + goto err_destroy_qp; + } + } + +out: + return ret; + +err_destroy_qp: + rdma_destroy_qp(queue->cm_id); +err_destroy_cq: + ib_free_cq(queue->cq); + goto out; +} + +static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue) +{ + ib_drain_qp(queue->qp); + if (queue->cm_id) + rdma_destroy_id(queue->cm_id); + ib_destroy_qp(queue->qp); + ib_free_cq(queue->cq); +} + +static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue) +{ + pr_debug("freeing queue %d\n", queue->idx); + + nvmet_sq_destroy(&queue->nvme_sq); + + nvmet_rdma_destroy_queue_ib(queue); + if (!queue->dev->srq) { + nvmet_rdma_free_cmds(queue->dev, queue->cmds, + queue->recv_queue_size, + !queue->host_qid); + } + nvmet_rdma_free_rsps(queue); + ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx); + kfree(queue); +} + +static void nvmet_rdma_release_queue_work(struct work_struct *w) +{ + struct nvmet_rdma_queue *queue = + container_of(w, struct nvmet_rdma_queue, release_work); + struct nvmet_rdma_device *dev = queue->dev; + + nvmet_rdma_free_queue(queue); + + kref_put(&dev->ref, nvmet_rdma_free_dev); +} + +static int +nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn, + struct nvmet_rdma_queue *queue) +{ + struct nvme_rdma_cm_req *req; + + req = (struct nvme_rdma_cm_req *)conn->private_data; + if (!req || conn->private_data_len == 0) + return NVME_RDMA_CM_INVALID_LEN; + + if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0) + return NVME_RDMA_CM_INVALID_RECFMT; + + queue->host_qid = le16_to_cpu(req->qid); + + /* + * req->hsqsize corresponds to our recv queue size plus 1 + * req->hrqsize corresponds to our send queue size + */ + queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1; + queue->send_queue_size = le16_to_cpu(req->hrqsize); + + if (!queue->host_qid && queue->recv_queue_size > NVME_AQ_DEPTH) + return NVME_RDMA_CM_INVALID_HSQSIZE; + + /* XXX: Should we enforce some kind of max for IO queues? */ + + return 0; +} + +static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id, + enum nvme_rdma_cm_status status) +{ + struct nvme_rdma_cm_rej rej; + + pr_debug("rejecting connect request: status %d (%s)\n", + status, nvme_rdma_cm_msg(status)); + + rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); + rej.sts = cpu_to_le16(status); + + return rdma_reject(cm_id, (void *)&rej, sizeof(rej)); +} + +static struct nvmet_rdma_queue * +nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev, + struct rdma_cm_id *cm_id, + struct rdma_cm_event *event) +{ + struct nvmet_rdma_queue *queue; + int ret; + + queue = kzalloc(sizeof(*queue), GFP_KERNEL); + if (!queue) { + ret = NVME_RDMA_CM_NO_RSC; + goto out_reject; + } + + ret = nvmet_sq_init(&queue->nvme_sq); + if (ret) { + ret = NVME_RDMA_CM_NO_RSC; + goto out_free_queue; + } + + ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue); + if (ret) + goto out_destroy_sq; + + /* + * Schedules the actual release because calling rdma_destroy_id from + * inside a CM callback would trigger a deadlock. (great API design..) + */ + INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work); + queue->dev = ndev; + queue->cm_id = cm_id; + + spin_lock_init(&queue->state_lock); + queue->state = NVMET_RDMA_Q_CONNECTING; + INIT_LIST_HEAD(&queue->rsp_wait_list); + INIT_LIST_HEAD(&queue->rsp_wr_wait_list); + spin_lock_init(&queue->rsp_wr_wait_lock); + INIT_LIST_HEAD(&queue->free_rsps); + spin_lock_init(&queue->rsps_lock); + INIT_LIST_HEAD(&queue->queue_list); + + queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL); + if (queue->idx < 0) { + ret = NVME_RDMA_CM_NO_RSC; + goto out_destroy_sq; + } + + ret = nvmet_rdma_alloc_rsps(queue); + if (ret) { + ret = NVME_RDMA_CM_NO_RSC; + goto out_ida_remove; + } + + if (!ndev->srq) { + queue->cmds = nvmet_rdma_alloc_cmds(ndev, + queue->recv_queue_size, + !queue->host_qid); + if (IS_ERR(queue->cmds)) { + ret = NVME_RDMA_CM_NO_RSC; + goto out_free_responses; + } + } + + ret = nvmet_rdma_create_queue_ib(queue); + if (ret) { + pr_err("%s: creating RDMA queue failed (%d).\n", + __func__, ret); + ret = NVME_RDMA_CM_NO_RSC; + goto out_free_cmds; + } + + return queue; + +out_free_cmds: + if (!ndev->srq) { + nvmet_rdma_free_cmds(queue->dev, queue->cmds, + queue->recv_queue_size, + !queue->host_qid); + } +out_free_responses: + nvmet_rdma_free_rsps(queue); +out_ida_remove: + ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx); +out_destroy_sq: + nvmet_sq_destroy(&queue->nvme_sq); +out_free_queue: + kfree(queue); +out_reject: + nvmet_rdma_cm_reject(cm_id, ret); + return NULL; +} + +static void nvmet_rdma_qp_event(struct ib_event *event, void *priv) +{ + struct nvmet_rdma_queue *queue = priv; + + switch (event->event) { + case IB_EVENT_COMM_EST: + rdma_notify(queue->cm_id, event->event); + break; + default: + pr_err("received IB QP event: %s (%d)\n", + ib_event_msg(event->event), event->event); + break; + } +} + +static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id, + struct nvmet_rdma_queue *queue, + struct rdma_conn_param *p) +{ + struct rdma_conn_param param = { }; + struct nvme_rdma_cm_rep priv = { }; + int ret = -ENOMEM; + + param.rnr_retry_count = 7; + param.flow_control = 1; + param.initiator_depth = min_t(u8, p->initiator_depth, + queue->dev->device->attrs.max_qp_init_rd_atom); + param.private_data = &priv; + param.private_data_len = sizeof(priv); + priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); + priv.crqsize = cpu_to_le16(queue->recv_queue_size); + + ret = rdma_accept(cm_id, ¶m); + if (ret) + pr_err("rdma_accept failed (error code = %d)\n", ret); + + return ret; +} + +static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event) +{ + struct nvmet_rdma_device *ndev; + struct nvmet_rdma_queue *queue; + int ret = -EINVAL; + + ndev = nvmet_rdma_find_get_device(cm_id); + if (!ndev) { + nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC); + return -ECONNREFUSED; + } + + queue = nvmet_rdma_alloc_queue(ndev, cm_id, event); + if (!queue) { + ret = -ENOMEM; + goto put_device; + } + queue->port = cm_id->context; + + if (queue->host_qid == 0) { + /* Let inflight controller teardown complete */ + flush_scheduled_work(); + } + + ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn); + if (ret) { + /* + * Don't destroy the cm_id in free path, as we implicitly + * destroy the cm_id here with non-zero ret code. + */ + queue->cm_id = NULL; + goto free_queue; + } + + mutex_lock(&nvmet_rdma_queue_mutex); + list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list); + mutex_unlock(&nvmet_rdma_queue_mutex); + + return 0; + +free_queue: + nvmet_rdma_free_queue(queue); +put_device: + kref_put(&ndev->ref, nvmet_rdma_free_dev); + + return ret; +} + +static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue) +{ + unsigned long flags; + + spin_lock_irqsave(&queue->state_lock, flags); + if (queue->state != NVMET_RDMA_Q_CONNECTING) { + pr_warn("trying to establish a connected queue\n"); + goto out_unlock; + } + queue->state = NVMET_RDMA_Q_LIVE; + + while (!list_empty(&queue->rsp_wait_list)) { + struct nvmet_rdma_rsp *cmd; + + cmd = list_first_entry(&queue->rsp_wait_list, + struct nvmet_rdma_rsp, wait_list); + list_del(&cmd->wait_list); + + spin_unlock_irqrestore(&queue->state_lock, flags); + nvmet_rdma_handle_command(queue, cmd); + spin_lock_irqsave(&queue->state_lock, flags); + } + +out_unlock: + spin_unlock_irqrestore(&queue->state_lock, flags); +} + +static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue) +{ + bool disconnect = false; + unsigned long flags; + + pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state); + + spin_lock_irqsave(&queue->state_lock, flags); + switch (queue->state) { + case NVMET_RDMA_Q_CONNECTING: + case NVMET_RDMA_Q_LIVE: + queue->state = NVMET_RDMA_Q_DISCONNECTING; + disconnect = true; + break; + case NVMET_RDMA_Q_DISCONNECTING: + break; + } + spin_unlock_irqrestore(&queue->state_lock, flags); + + if (disconnect) { + rdma_disconnect(queue->cm_id); + schedule_work(&queue->release_work); + } +} + +static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue) +{ + bool disconnect = false; + + mutex_lock(&nvmet_rdma_queue_mutex); + if (!list_empty(&queue->queue_list)) { + list_del_init(&queue->queue_list); + disconnect = true; + } + mutex_unlock(&nvmet_rdma_queue_mutex); + + if (disconnect) + __nvmet_rdma_queue_disconnect(queue); +} + +static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id, + struct nvmet_rdma_queue *queue) +{ + WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING); + + mutex_lock(&nvmet_rdma_queue_mutex); + if (!list_empty(&queue->queue_list)) + list_del_init(&queue->queue_list); + mutex_unlock(&nvmet_rdma_queue_mutex); + + pr_err("failed to connect queue %d\n", queue->idx); + schedule_work(&queue->release_work); +} + +/** + * nvme_rdma_device_removal() - Handle RDMA device removal + * @cm_id: rdma_cm id, used for nvmet port + * @queue: nvmet rdma queue (cm id qp_context) + * + * DEVICE_REMOVAL event notifies us that the RDMA device is about + * to unplug. Note that this event can be generated on a normal + * queue cm_id and/or a device bound listener cm_id (where in this + * case queue will be null). + * + * We registered an ib_client to handle device removal for queues, + * so we only need to handle the listening port cm_ids. In this case + * we nullify the priv to prevent double cm_id destruction and destroying + * the cm_id implicitely by returning a non-zero rc to the callout. + */ +static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id, + struct nvmet_rdma_queue *queue) +{ + struct nvmet_port *port; + + if (queue) { + /* + * This is a queue cm_id. we have registered + * an ib_client to handle queues removal + * so don't interfear and just return. + */ + return 0; + } + + port = cm_id->context; + + /* + * This is a listener cm_id. Make sure that + * future remove_port won't invoke a double + * cm_id destroy. use atomic xchg to make sure + * we don't compete with remove_port. + */ + if (xchg(&port->priv, NULL) != cm_id) + return 0; + + /* + * We need to return 1 so that the core will destroy + * it's own ID. What a great API design.. + */ + return 1; +} + +static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event) +{ + struct nvmet_rdma_queue *queue = NULL; + int ret = 0; + + if (cm_id->qp) + queue = cm_id->qp->qp_context; + + pr_debug("%s (%d): status %d id %p\n", + rdma_event_msg(event->event), event->event, + event->status, cm_id); + + switch (event->event) { + case RDMA_CM_EVENT_CONNECT_REQUEST: + ret = nvmet_rdma_queue_connect(cm_id, event); + break; + case RDMA_CM_EVENT_ESTABLISHED: + nvmet_rdma_queue_established(queue); + break; + case RDMA_CM_EVENT_ADDR_CHANGE: + case RDMA_CM_EVENT_DISCONNECTED: + case RDMA_CM_EVENT_TIMEWAIT_EXIT: + nvmet_rdma_queue_disconnect(queue); + break; + case RDMA_CM_EVENT_DEVICE_REMOVAL: + ret = nvmet_rdma_device_removal(cm_id, queue); + break; + case RDMA_CM_EVENT_REJECTED: + pr_debug("Connection rejected: %s\n", + rdma_reject_msg(cm_id, event->status)); + /* FALLTHROUGH */ + case RDMA_CM_EVENT_UNREACHABLE: + case RDMA_CM_EVENT_CONNECT_ERROR: + nvmet_rdma_queue_connect_fail(cm_id, queue); + break; + default: + pr_err("received unrecognized RDMA CM event %d\n", + event->event); + break; + } + + return ret; +} + +static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl) +{ + struct nvmet_rdma_queue *queue; + +restart: + mutex_lock(&nvmet_rdma_queue_mutex); + list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) { + if (queue->nvme_sq.ctrl == ctrl) { + list_del_init(&queue->queue_list); + mutex_unlock(&nvmet_rdma_queue_mutex); + + __nvmet_rdma_queue_disconnect(queue); + goto restart; + } + } + mutex_unlock(&nvmet_rdma_queue_mutex); +} + +static int nvmet_rdma_add_port(struct nvmet_port *port) +{ + struct rdma_cm_id *cm_id; + struct sockaddr_storage addr = { }; + __kernel_sa_family_t af; + int ret; + + switch (port->disc_addr.adrfam) { + case NVMF_ADDR_FAMILY_IP4: + af = AF_INET; + break; + case NVMF_ADDR_FAMILY_IP6: + af = AF_INET6; + break; + default: + pr_err("address family %d not supported\n", + port->disc_addr.adrfam); + return -EINVAL; + } + + if (port->inline_data_size < 0) { + port->inline_data_size = NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE; + } else if (port->inline_data_size > NVMET_RDMA_MAX_INLINE_DATA_SIZE) { + pr_warn("inline_data_size %u is too large, reducing to %u\n", + port->inline_data_size, + NVMET_RDMA_MAX_INLINE_DATA_SIZE); + port->inline_data_size = NVMET_RDMA_MAX_INLINE_DATA_SIZE; + } + + ret = inet_pton_with_scope(&init_net, af, port->disc_addr.traddr, + port->disc_addr.trsvcid, &addr); + if (ret) { + pr_err("malformed ip/port passed: %s:%s\n", + port->disc_addr.traddr, port->disc_addr.trsvcid); + return ret; + } + + cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port, + RDMA_PS_TCP, IB_QPT_RC); + if (IS_ERR(cm_id)) { + pr_err("CM ID creation failed\n"); + return PTR_ERR(cm_id); + } + + /* + * Allow both IPv4 and IPv6 sockets to bind a single port + * at the same time. + */ + ret = rdma_set_afonly(cm_id, 1); + if (ret) { + pr_err("rdma_set_afonly failed (%d)\n", ret); + goto out_destroy_id; + } + + ret = rdma_bind_addr(cm_id, (struct sockaddr *)&addr); + if (ret) { + pr_err("binding CM ID to %pISpcs failed (%d)\n", + (struct sockaddr *)&addr, ret); + goto out_destroy_id; + } + + ret = rdma_listen(cm_id, 128); + if (ret) { + pr_err("listening to %pISpcs failed (%d)\n", + (struct sockaddr *)&addr, ret); + goto out_destroy_id; + } + + pr_info("enabling port %d (%pISpcs)\n", + le16_to_cpu(port->disc_addr.portid), (struct sockaddr *)&addr); + port->priv = cm_id; + return 0; + +out_destroy_id: + rdma_destroy_id(cm_id); + return ret; +} + +static void nvmet_rdma_remove_port(struct nvmet_port *port) +{ + struct rdma_cm_id *cm_id = xchg(&port->priv, NULL); + + if (cm_id) + rdma_destroy_id(cm_id); +} + +static void nvmet_rdma_disc_port_addr(struct nvmet_req *req, + struct nvmet_port *port, char *traddr) +{ + struct rdma_cm_id *cm_id = port->priv; + + if (inet_addr_is_any((struct sockaddr *)&cm_id->route.addr.src_addr)) { + struct nvmet_rdma_rsp *rsp = + container_of(req, struct nvmet_rdma_rsp, req); + struct rdma_cm_id *req_cm_id = rsp->queue->cm_id; + struct sockaddr *addr = (void *)&req_cm_id->route.addr.src_addr; + + sprintf(traddr, "%pISc", addr); + } else { + memcpy(traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE); + } +} + +static const struct nvmet_fabrics_ops nvmet_rdma_ops = { + .owner = THIS_MODULE, + .type = NVMF_TRTYPE_RDMA, + .msdbd = 1, + .has_keyed_sgls = 1, + .add_port = nvmet_rdma_add_port, + .remove_port = nvmet_rdma_remove_port, + .queue_response = nvmet_rdma_queue_response, + .delete_ctrl = nvmet_rdma_delete_ctrl, + .disc_traddr = nvmet_rdma_disc_port_addr, +}; + +static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data) +{ + struct nvmet_rdma_queue *queue, *tmp; + struct nvmet_rdma_device *ndev; + bool found = false; + + mutex_lock(&device_list_mutex); + list_for_each_entry(ndev, &device_list, entry) { + if (ndev->device == ib_device) { + found = true; + break; + } + } + mutex_unlock(&device_list_mutex); + + if (!found) + return; + + /* + * IB Device that is used by nvmet controllers is being removed, + * delete all queues using this device. + */ + mutex_lock(&nvmet_rdma_queue_mutex); + list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list, + queue_list) { + if (queue->dev->device != ib_device) + continue; + + pr_info("Removing queue %d\n", queue->idx); + list_del_init(&queue->queue_list); + __nvmet_rdma_queue_disconnect(queue); + } + mutex_unlock(&nvmet_rdma_queue_mutex); + + flush_scheduled_work(); +} + +static struct ib_client nvmet_rdma_ib_client = { + .name = "nvmet_rdma", + .remove = nvmet_rdma_remove_one +}; + +static int __init nvmet_rdma_init(void) +{ + int ret; + + ret = ib_register_client(&nvmet_rdma_ib_client); + if (ret) + return ret; + + ret = nvmet_register_transport(&nvmet_rdma_ops); + if (ret) + goto err_ib_client; + + return 0; + +err_ib_client: + ib_unregister_client(&nvmet_rdma_ib_client); + return ret; +} + +static void __exit nvmet_rdma_exit(void) +{ + nvmet_unregister_transport(&nvmet_rdma_ops); + ib_unregister_client(&nvmet_rdma_ib_client); + WARN_ON_ONCE(!list_empty(&nvmet_rdma_queue_list)); + ida_destroy(&nvmet_rdma_queue_ida); +} + +module_init(nvmet_rdma_init); +module_exit(nvmet_rdma_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */ |