diff options
Diffstat (limited to 'drivers/vhost/scsi.c')
| -rw-r--r-- | drivers/vhost/scsi.c | 2151 |
1 files changed, 2151 insertions, 0 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c new file mode 100644 index 000000000..5e298d928 --- /dev/null +++ b/drivers/vhost/scsi.c @@ -0,0 +1,2151 @@ +/******************************************************************************* + * Vhost kernel TCM fabric driver for virtio SCSI initiators + * + * (C) Copyright 2010-2013 Datera, Inc. + * (C) Copyright 2010-2012 IBM Corp. + * + * Licensed to the Linux Foundation under the General Public License (GPL) version 2. + * + * Authors: Nicholas A. Bellinger <nab@daterainc.com> + * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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. + * + ****************************************************************************/ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <generated/utsrelease.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/kthread.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/configfs.h> +#include <linux/ctype.h> +#include <linux/compat.h> +#include <linux/eventfd.h> +#include <linux/fs.h> +#include <linux/vmalloc.h> +#include <linux/miscdevice.h> +#include <asm/unaligned.h> +#include <scsi/scsi_common.h> +#include <scsi/scsi_proto.h> +#include <target/target_core_base.h> +#include <target/target_core_fabric.h> +#include <linux/vhost.h> +#include <linux/virtio_scsi.h> +#include <linux/llist.h> +#include <linux/bitmap.h> + +#include "vhost.h" + +#define VHOST_SCSI_VERSION "v0.1" +#define VHOST_SCSI_NAMELEN 256 +#define VHOST_SCSI_MAX_CDB_SIZE 32 +#define VHOST_SCSI_DEFAULT_TAGS 256 +#define VHOST_SCSI_PREALLOC_SGLS 2048 +#define VHOST_SCSI_PREALLOC_UPAGES 2048 +#define VHOST_SCSI_PREALLOC_PROT_SGLS 2048 + +/* Max number of requests before requeueing the job. + * Using this limit prevents one virtqueue from starving others with + * request. + */ +#define VHOST_SCSI_WEIGHT 256 + +struct vhost_scsi_inflight { + /* Wait for the flush operation to finish */ + struct completion comp; + /* Refcount for the inflight reqs */ + struct kref kref; +}; + +struct vhost_scsi_cmd { + /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ + int tvc_vq_desc; + /* virtio-scsi initiator task attribute */ + int tvc_task_attr; + /* virtio-scsi response incoming iovecs */ + int tvc_in_iovs; + /* virtio-scsi initiator data direction */ + enum dma_data_direction tvc_data_direction; + /* Expected data transfer length from virtio-scsi header */ + u32 tvc_exp_data_len; + /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ + u64 tvc_tag; + /* The number of scatterlists associated with this cmd */ + u32 tvc_sgl_count; + u32 tvc_prot_sgl_count; + /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ + u32 tvc_lun; + /* Pointer to the SGL formatted memory from virtio-scsi */ + struct scatterlist *tvc_sgl; + struct scatterlist *tvc_prot_sgl; + struct page **tvc_upages; + /* Pointer to response header iovec */ + struct iovec tvc_resp_iov; + /* Pointer to vhost_scsi for our device */ + struct vhost_scsi *tvc_vhost; + /* Pointer to vhost_virtqueue for the cmd */ + struct vhost_virtqueue *tvc_vq; + /* Pointer to vhost nexus memory */ + struct vhost_scsi_nexus *tvc_nexus; + /* The TCM I/O descriptor that is accessed via container_of() */ + struct se_cmd tvc_se_cmd; + /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ + struct work_struct work; + /* Copy of the incoming SCSI command descriptor block (CDB) */ + unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; + /* Sense buffer that will be mapped into outgoing status */ + unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; + /* Completed commands list, serviced from vhost worker thread */ + struct llist_node tvc_completion_list; + /* Used to track inflight cmd */ + struct vhost_scsi_inflight *inflight; +}; + +struct vhost_scsi_nexus { + /* Pointer to TCM session for I_T Nexus */ + struct se_session *tvn_se_sess; +}; + +struct vhost_scsi_tpg { + /* Vhost port target portal group tag for TCM */ + u16 tport_tpgt; + /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ + int tv_tpg_port_count; + /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ + int tv_tpg_vhost_count; + /* Used for enabling T10-PI with legacy devices */ + int tv_fabric_prot_type; + /* list for vhost_scsi_list */ + struct list_head tv_tpg_list; + /* Used to protect access for tpg_nexus */ + struct mutex tv_tpg_mutex; + /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ + struct vhost_scsi_nexus *tpg_nexus; + /* Pointer back to vhost_scsi_tport */ + struct vhost_scsi_tport *tport; + /* Returned by vhost_scsi_make_tpg() */ + struct se_portal_group se_tpg; + /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ + struct vhost_scsi *vhost_scsi; +}; + +struct vhost_scsi_tport { + /* SCSI protocol the tport is providing */ + u8 tport_proto_id; + /* Binary World Wide unique Port Name for Vhost Target port */ + u64 tport_wwpn; + /* ASCII formatted WWPN for Vhost Target port */ + char tport_name[VHOST_SCSI_NAMELEN]; + /* Returned by vhost_scsi_make_tport() */ + struct se_wwn tport_wwn; +}; + +struct vhost_scsi_evt { + /* event to be sent to guest */ + struct virtio_scsi_event event; + /* event list, serviced from vhost worker thread */ + struct llist_node list; +}; + +enum { + VHOST_SCSI_VQ_CTL = 0, + VHOST_SCSI_VQ_EVT = 1, + VHOST_SCSI_VQ_IO = 2, +}; + +/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ +enum { + VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | + (1ULL << VIRTIO_SCSI_F_T10_PI) +}; + +#define VHOST_SCSI_MAX_TARGET 256 +#define VHOST_SCSI_MAX_VQ 128 +#define VHOST_SCSI_MAX_EVENT 128 + +struct vhost_scsi_virtqueue { + struct vhost_virtqueue vq; + /* + * Reference counting for inflight reqs, used for flush operation. At + * each time, one reference tracks new commands submitted, while we + * wait for another one to reach 0. + */ + struct vhost_scsi_inflight inflights[2]; + /* + * Indicate current inflight in use, protected by vq->mutex. + * Writers must also take dev mutex and flush under it. + */ + int inflight_idx; +}; + +struct vhost_scsi { + /* Protected by vhost_scsi->dev.mutex */ + struct vhost_scsi_tpg **vs_tpg; + char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; + + struct vhost_dev dev; + struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; + + struct vhost_work vs_completion_work; /* cmd completion work item */ + struct llist_head vs_completion_list; /* cmd completion queue */ + + struct vhost_work vs_event_work; /* evt injection work item */ + struct llist_head vs_event_list; /* evt injection queue */ + + bool vs_events_missed; /* any missed events, protected by vq->mutex */ + int vs_events_nr; /* num of pending events, protected by vq->mutex */ +}; + +static struct workqueue_struct *vhost_scsi_workqueue; + +/* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ +static DEFINE_MUTEX(vhost_scsi_mutex); +static LIST_HEAD(vhost_scsi_list); + +static void vhost_scsi_done_inflight(struct kref *kref) +{ + struct vhost_scsi_inflight *inflight; + + inflight = container_of(kref, struct vhost_scsi_inflight, kref); + complete(&inflight->comp); +} + +static void vhost_scsi_init_inflight(struct vhost_scsi *vs, + struct vhost_scsi_inflight *old_inflight[]) +{ + struct vhost_scsi_inflight *new_inflight; + struct vhost_virtqueue *vq; + int idx, i; + + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { + vq = &vs->vqs[i].vq; + + mutex_lock(&vq->mutex); + + /* store old infight */ + idx = vs->vqs[i].inflight_idx; + if (old_inflight) + old_inflight[i] = &vs->vqs[i].inflights[idx]; + + /* setup new infight */ + vs->vqs[i].inflight_idx = idx ^ 1; + new_inflight = &vs->vqs[i].inflights[idx ^ 1]; + kref_init(&new_inflight->kref); + init_completion(&new_inflight->comp); + + mutex_unlock(&vq->mutex); + } +} + +static struct vhost_scsi_inflight * +vhost_scsi_get_inflight(struct vhost_virtqueue *vq) +{ + struct vhost_scsi_inflight *inflight; + struct vhost_scsi_virtqueue *svq; + + svq = container_of(vq, struct vhost_scsi_virtqueue, vq); + inflight = &svq->inflights[svq->inflight_idx]; + kref_get(&inflight->kref); + + return inflight; +} + +static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) +{ + kref_put(&inflight->kref, vhost_scsi_done_inflight); +} + +static int vhost_scsi_check_true(struct se_portal_group *se_tpg) +{ + return 1; +} + +static int vhost_scsi_check_false(struct se_portal_group *se_tpg) +{ + return 0; +} + +static char *vhost_scsi_get_fabric_name(void) +{ + return "vhost"; +} + +static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) +{ + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + struct vhost_scsi_tport *tport = tpg->tport; + + return &tport->tport_name[0]; +} + +static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) +{ + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + return tpg->tport_tpgt; +} + +static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) +{ + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + + return tpg->tv_fabric_prot_type; +} + +static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) +{ + return 1; +} + +static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) +{ + struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, + struct vhost_scsi_cmd, tvc_se_cmd); + struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; + int i; + + if (tv_cmd->tvc_sgl_count) { + for (i = 0; i < tv_cmd->tvc_sgl_count; i++) + put_page(sg_page(&tv_cmd->tvc_sgl[i])); + } + if (tv_cmd->tvc_prot_sgl_count) { + for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) + put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); + } + + vhost_scsi_put_inflight(tv_cmd->inflight); + target_free_tag(se_sess, se_cmd); +} + +static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) +{ + return 0; +} + +static int vhost_scsi_write_pending(struct se_cmd *se_cmd) +{ + /* Go ahead and process the write immediately */ + target_execute_cmd(se_cmd); + return 0; +} + +static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) +{ + return 0; +} + +static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) +{ + return; +} + +static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) +{ + return 0; +} + +static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) +{ + struct vhost_scsi *vs = cmd->tvc_vhost; + + llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); + + vhost_work_queue(&vs->dev, &vs->vs_completion_work); +} + +static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) +{ + struct vhost_scsi_cmd *cmd = container_of(se_cmd, + struct vhost_scsi_cmd, tvc_se_cmd); + vhost_scsi_complete_cmd(cmd); + return 0; +} + +static int vhost_scsi_queue_status(struct se_cmd *se_cmd) +{ + struct vhost_scsi_cmd *cmd = container_of(se_cmd, + struct vhost_scsi_cmd, tvc_se_cmd); + vhost_scsi_complete_cmd(cmd); + return 0; +} + +static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) +{ + return; +} + +static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) +{ + return; +} + +static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) +{ + vs->vs_events_nr--; + kfree(evt); +} + +static struct vhost_scsi_evt * +vhost_scsi_allocate_evt(struct vhost_scsi *vs, + u32 event, u32 reason) +{ + struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; + struct vhost_scsi_evt *evt; + + if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { + vs->vs_events_missed = true; + return NULL; + } + + evt = kzalloc(sizeof(*evt), GFP_KERNEL); + if (!evt) { + vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); + vs->vs_events_missed = true; + return NULL; + } + + evt->event.event = cpu_to_vhost32(vq, event); + evt->event.reason = cpu_to_vhost32(vq, reason); + vs->vs_events_nr++; + + return evt; +} + +static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) +{ + struct se_cmd *se_cmd = &cmd->tvc_se_cmd; + + /* TODO locking against target/backend threads? */ + transport_generic_free_cmd(se_cmd, 0); + +} + +static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) +{ + return target_put_sess_cmd(se_cmd); +} + +static void +vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) +{ + struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; + struct virtio_scsi_event *event = &evt->event; + struct virtio_scsi_event __user *eventp; + unsigned out, in; + int head, ret; + + if (!vq->private_data) { + vs->vs_events_missed = true; + return; + } + +again: + vhost_disable_notify(&vs->dev, vq); + head = vhost_get_vq_desc(vq, vq->iov, + ARRAY_SIZE(vq->iov), &out, &in, + NULL, NULL); + if (head < 0) { + vs->vs_events_missed = true; + return; + } + if (head == vq->num) { + if (vhost_enable_notify(&vs->dev, vq)) + goto again; + vs->vs_events_missed = true; + return; + } + + if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { + vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", + vq->iov[out].iov_len); + vs->vs_events_missed = true; + return; + } + + if (vs->vs_events_missed) { + event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); + vs->vs_events_missed = false; + } + + eventp = vq->iov[out].iov_base; + ret = __copy_to_user(eventp, event, sizeof(*event)); + if (!ret) + vhost_add_used_and_signal(&vs->dev, vq, head, 0); + else + vq_err(vq, "Faulted on vhost_scsi_send_event\n"); +} + +static void vhost_scsi_evt_work(struct vhost_work *work) +{ + struct vhost_scsi *vs = container_of(work, struct vhost_scsi, + vs_event_work); + struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; + struct vhost_scsi_evt *evt, *t; + struct llist_node *llnode; + + mutex_lock(&vq->mutex); + llnode = llist_del_all(&vs->vs_event_list); + llist_for_each_entry_safe(evt, t, llnode, list) { + vhost_scsi_do_evt_work(vs, evt); + vhost_scsi_free_evt(vs, evt); + } + mutex_unlock(&vq->mutex); +} + +/* Fill in status and signal that we are done processing this command + * + * This is scheduled in the vhost work queue so we are called with the owner + * process mm and can access the vring. + */ +static void vhost_scsi_complete_cmd_work(struct vhost_work *work) +{ + struct vhost_scsi *vs = container_of(work, struct vhost_scsi, + vs_completion_work); + DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); + struct virtio_scsi_cmd_resp v_rsp; + struct vhost_scsi_cmd *cmd, *t; + struct llist_node *llnode; + struct se_cmd *se_cmd; + struct iov_iter iov_iter; + int ret, vq; + + bitmap_zero(signal, VHOST_SCSI_MAX_VQ); + llnode = llist_del_all(&vs->vs_completion_list); + llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { + se_cmd = &cmd->tvc_se_cmd; + + pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, + cmd, se_cmd->residual_count, se_cmd->scsi_status); + + memset(&v_rsp, 0, sizeof(v_rsp)); + v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); + /* TODO is status_qualifier field needed? */ + v_rsp.status = se_cmd->scsi_status; + v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, + se_cmd->scsi_sense_length); + memcpy(v_rsp.sense, cmd->tvc_sense_buf, + se_cmd->scsi_sense_length); + + iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, + cmd->tvc_in_iovs, sizeof(v_rsp)); + ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); + if (likely(ret == sizeof(v_rsp))) { + struct vhost_scsi_virtqueue *q; + vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); + q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); + vq = q - vs->vqs; + __set_bit(vq, signal); + } else + pr_err("Faulted on virtio_scsi_cmd_resp\n"); + + vhost_scsi_free_cmd(cmd); + } + + vq = -1; + while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) + < VHOST_SCSI_MAX_VQ) + vhost_signal(&vs->dev, &vs->vqs[vq].vq); +} + +static struct vhost_scsi_cmd * +vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, + unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, + u32 exp_data_len, int data_direction) +{ + struct vhost_scsi_cmd *cmd; + struct vhost_scsi_nexus *tv_nexus; + struct se_session *se_sess; + struct scatterlist *sg, *prot_sg; + struct page **pages; + int tag, cpu; + + tv_nexus = tpg->tpg_nexus; + if (!tv_nexus) { + pr_err("Unable to locate active struct vhost_scsi_nexus\n"); + return ERR_PTR(-EIO); + } + se_sess = tv_nexus->tvn_se_sess; + + tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); + if (tag < 0) { + pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); + return ERR_PTR(-ENOMEM); + } + + cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; + sg = cmd->tvc_sgl; + prot_sg = cmd->tvc_prot_sgl; + pages = cmd->tvc_upages; + memset(cmd, 0, sizeof(*cmd)); + cmd->tvc_sgl = sg; + cmd->tvc_prot_sgl = prot_sg; + cmd->tvc_upages = pages; + cmd->tvc_se_cmd.map_tag = tag; + cmd->tvc_se_cmd.map_cpu = cpu; + cmd->tvc_tag = scsi_tag; + cmd->tvc_lun = lun; + cmd->tvc_task_attr = task_attr; + cmd->tvc_exp_data_len = exp_data_len; + cmd->tvc_data_direction = data_direction; + cmd->tvc_nexus = tv_nexus; + cmd->inflight = vhost_scsi_get_inflight(vq); + + memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); + + return cmd; +} + +/* + * Map a user memory range into a scatterlist + * + * Returns the number of scatterlist entries used or -errno on error. + */ +static int +vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, + struct iov_iter *iter, + struct scatterlist *sgl, + bool write) +{ + struct page **pages = cmd->tvc_upages; + struct scatterlist *sg = sgl; + ssize_t bytes; + size_t offset; + unsigned int npages = 0; + + bytes = iov_iter_get_pages(iter, pages, LONG_MAX, + VHOST_SCSI_PREALLOC_UPAGES, &offset); + /* No pages were pinned */ + if (bytes <= 0) + return bytes < 0 ? bytes : -EFAULT; + + iov_iter_advance(iter, bytes); + + while (bytes) { + unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); + sg_set_page(sg++, pages[npages++], n, offset); + bytes -= n; + offset = 0; + } + return npages; +} + +static int +vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) +{ + int sgl_count = 0; + + if (!iter || !iter->iov) { + pr_err("%s: iter->iov is NULL, but expected bytes: %zu" + " present\n", __func__, bytes); + return -EINVAL; + } + + sgl_count = iov_iter_npages(iter, 0xffff); + if (sgl_count > max_sgls) { + pr_err("%s: requested sgl_count: %d exceeds pre-allocated" + " max_sgls: %d\n", __func__, sgl_count, max_sgls); + return -EINVAL; + } + return sgl_count; +} + +static int +vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, + struct iov_iter *iter, + struct scatterlist *sg, int sg_count) +{ + struct scatterlist *p = sg; + int ret; + + while (iov_iter_count(iter)) { + ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); + if (ret < 0) { + while (p < sg) { + struct page *page = sg_page(p++); + if (page) + put_page(page); + } + return ret; + } + sg += ret; + } + return 0; +} + +static int +vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, + size_t prot_bytes, struct iov_iter *prot_iter, + size_t data_bytes, struct iov_iter *data_iter) +{ + int sgl_count, ret; + bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); + + if (prot_bytes) { + sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, + VHOST_SCSI_PREALLOC_PROT_SGLS); + if (sgl_count < 0) + return sgl_count; + + sg_init_table(cmd->tvc_prot_sgl, sgl_count); + cmd->tvc_prot_sgl_count = sgl_count; + pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, + cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); + + ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, + cmd->tvc_prot_sgl, + cmd->tvc_prot_sgl_count); + if (ret < 0) { + cmd->tvc_prot_sgl_count = 0; + return ret; + } + } + sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, + VHOST_SCSI_PREALLOC_SGLS); + if (sgl_count < 0) + return sgl_count; + + sg_init_table(cmd->tvc_sgl, sgl_count); + cmd->tvc_sgl_count = sgl_count; + pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, + cmd->tvc_sgl, cmd->tvc_sgl_count); + + ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, + cmd->tvc_sgl, cmd->tvc_sgl_count); + if (ret < 0) { + cmd->tvc_sgl_count = 0; + return ret; + } + return 0; +} + +static int vhost_scsi_to_tcm_attr(int attr) +{ + switch (attr) { + case VIRTIO_SCSI_S_SIMPLE: + return TCM_SIMPLE_TAG; + case VIRTIO_SCSI_S_ORDERED: + return TCM_ORDERED_TAG; + case VIRTIO_SCSI_S_HEAD: + return TCM_HEAD_TAG; + case VIRTIO_SCSI_S_ACA: + return TCM_ACA_TAG; + default: + break; + } + return TCM_SIMPLE_TAG; +} + +static void vhost_scsi_submission_work(struct work_struct *work) +{ + struct vhost_scsi_cmd *cmd = + container_of(work, struct vhost_scsi_cmd, work); + struct vhost_scsi_nexus *tv_nexus; + struct se_cmd *se_cmd = &cmd->tvc_se_cmd; + struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; + int rc; + + /* FIXME: BIDI operation */ + if (cmd->tvc_sgl_count) { + sg_ptr = cmd->tvc_sgl; + + if (cmd->tvc_prot_sgl_count) + sg_prot_ptr = cmd->tvc_prot_sgl; + else + se_cmd->prot_pto = true; + } else { + sg_ptr = NULL; + } + tv_nexus = cmd->tvc_nexus; + + se_cmd->tag = 0; + rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, + cmd->tvc_cdb, &cmd->tvc_sense_buf[0], + cmd->tvc_lun, cmd->tvc_exp_data_len, + vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), + cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, + sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, + cmd->tvc_prot_sgl_count); + if (rc < 0) { + transport_send_check_condition_and_sense(se_cmd, + TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); + transport_generic_free_cmd(se_cmd, 0); + } +} + +static void +vhost_scsi_send_bad_target(struct vhost_scsi *vs, + struct vhost_virtqueue *vq, + int head, unsigned out) +{ + struct virtio_scsi_cmd_resp __user *resp; + struct virtio_scsi_cmd_resp rsp; + int ret; + + memset(&rsp, 0, sizeof(rsp)); + rsp.response = VIRTIO_SCSI_S_BAD_TARGET; + resp = vq->iov[out].iov_base; + ret = __copy_to_user(resp, &rsp, sizeof(rsp)); + if (!ret) + vhost_add_used_and_signal(&vs->dev, vq, head, 0); + else + pr_err("Faulted on virtio_scsi_cmd_resp\n"); +} + +static void +vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) +{ + struct vhost_scsi_tpg **vs_tpg, *tpg; + struct virtio_scsi_cmd_req v_req; + struct virtio_scsi_cmd_req_pi v_req_pi; + struct vhost_scsi_cmd *cmd; + struct iov_iter out_iter, in_iter, prot_iter, data_iter; + u64 tag; + u32 exp_data_len, data_direction; + unsigned int out = 0, in = 0; + int head, ret, prot_bytes, c = 0; + size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp); + size_t out_size, in_size; + u16 lun; + u8 *target, *lunp, task_attr; + bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); + void *req, *cdb; + + mutex_lock(&vq->mutex); + /* + * We can handle the vq only after the endpoint is setup by calling the + * VHOST_SCSI_SET_ENDPOINT ioctl. + */ + vs_tpg = vq->private_data; + if (!vs_tpg) + goto out; + + vhost_disable_notify(&vs->dev, vq); + + do { + head = vhost_get_vq_desc(vq, vq->iov, + ARRAY_SIZE(vq->iov), &out, &in, + NULL, NULL); + pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", + head, out, in); + /* On error, stop handling until the next kick. */ + if (unlikely(head < 0)) + break; + /* Nothing new? Wait for eventfd to tell us they refilled. */ + if (head == vq->num) { + if (unlikely(vhost_enable_notify(&vs->dev, vq))) { + vhost_disable_notify(&vs->dev, vq); + continue; + } + break; + } + /* + * Check for a sane response buffer so we can report early + * errors back to the guest. + */ + if (unlikely(vq->iov[out].iov_len < rsp_size)) { + vq_err(vq, "Expecting at least virtio_scsi_cmd_resp" + " size, got %zu bytes\n", vq->iov[out].iov_len); + break; + } + /* + * Setup pointers and values based upon different virtio-scsi + * request header if T10_PI is enabled in KVM guest. + */ + if (t10_pi) { + req = &v_req_pi; + req_size = sizeof(v_req_pi); + lunp = &v_req_pi.lun[0]; + target = &v_req_pi.lun[1]; + } else { + req = &v_req; + req_size = sizeof(v_req); + lunp = &v_req.lun[0]; + target = &v_req.lun[1]; + } + /* + * FIXME: Not correct for BIDI operation + */ + out_size = iov_length(vq->iov, out); + in_size = iov_length(&vq->iov[out], in); + + /* + * Copy over the virtio-scsi request header, which for a + * ANY_LAYOUT enabled guest may span multiple iovecs, or a + * single iovec may contain both the header + outgoing + * WRITE payloads. + * + * copy_from_iter() will advance out_iter, so that it will + * point at the start of the outgoing WRITE payload, if + * DMA_TO_DEVICE is set. + */ + iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size); + + if (unlikely(!copy_from_iter_full(req, req_size, &out_iter))) { + vq_err(vq, "Faulted on copy_from_iter\n"); + vhost_scsi_send_bad_target(vs, vq, head, out); + continue; + } + /* virtio-scsi spec requires byte 0 of the lun to be 1 */ + if (unlikely(*lunp != 1)) { + vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp); + vhost_scsi_send_bad_target(vs, vq, head, out); + continue; + } + + tpg = READ_ONCE(vs_tpg[*target]); + if (unlikely(!tpg)) { + /* Target does not exist, fail the request */ + vhost_scsi_send_bad_target(vs, vq, head, out); + continue; + } + /* + * Determine data_direction by calculating the total outgoing + * iovec sizes + incoming iovec sizes vs. virtio-scsi request + + * response headers respectively. + * + * For DMA_TO_DEVICE this is out_iter, which is already pointing + * to the right place. + * + * For DMA_FROM_DEVICE, the iovec will be just past the end + * of the virtio-scsi response header in either the same + * or immediately following iovec. + * + * Any associated T10_PI bytes for the outgoing / incoming + * payloads are included in calculation of exp_data_len here. + */ + prot_bytes = 0; + + if (out_size > req_size) { + data_direction = DMA_TO_DEVICE; + exp_data_len = out_size - req_size; + data_iter = out_iter; + } else if (in_size > rsp_size) { + data_direction = DMA_FROM_DEVICE; + exp_data_len = in_size - rsp_size; + + iov_iter_init(&in_iter, READ, &vq->iov[out], in, + rsp_size + exp_data_len); + iov_iter_advance(&in_iter, rsp_size); + data_iter = in_iter; + } else { + data_direction = DMA_NONE; + exp_data_len = 0; + } + /* + * If T10_PI header + payload is present, setup prot_iter values + * and recalculate data_iter for vhost_scsi_mapal() mapping to + * host scatterlists via get_user_pages_fast(). + */ + if (t10_pi) { + if (v_req_pi.pi_bytesout) { + if (data_direction != DMA_TO_DEVICE) { + vq_err(vq, "Received non zero pi_bytesout," + " but wrong data_direction\n"); + vhost_scsi_send_bad_target(vs, vq, head, out); + continue; + } + prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); + } else if (v_req_pi.pi_bytesin) { + if (data_direction != DMA_FROM_DEVICE) { + vq_err(vq, "Received non zero pi_bytesin," + " but wrong data_direction\n"); + vhost_scsi_send_bad_target(vs, vq, head, out); + continue; + } + prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); + } + /* + * Set prot_iter to data_iter and truncate it to + * prot_bytes, and advance data_iter past any + * preceeding prot_bytes that may be present. + * + * Also fix up the exp_data_len to reflect only the + * actual data payload length. + */ + if (prot_bytes) { + exp_data_len -= prot_bytes; + prot_iter = data_iter; + iov_iter_truncate(&prot_iter, prot_bytes); + iov_iter_advance(&data_iter, prot_bytes); + } + tag = vhost64_to_cpu(vq, v_req_pi.tag); + task_attr = v_req_pi.task_attr; + cdb = &v_req_pi.cdb[0]; + lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; + } else { + tag = vhost64_to_cpu(vq, v_req.tag); + task_attr = v_req.task_attr; + cdb = &v_req.cdb[0]; + lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; + } + /* + * Check that the received CDB size does not exceeded our + * hardcoded max for vhost-scsi, then get a pre-allocated + * cmd descriptor for the new virtio-scsi tag. + * + * TODO what if cdb was too small for varlen cdb header? + */ + if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { + vq_err(vq, "Received SCSI CDB with command_size: %d that" + " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", + scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); + vhost_scsi_send_bad_target(vs, vq, head, out); + continue; + } + cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, + exp_data_len + prot_bytes, + data_direction); + if (IS_ERR(cmd)) { + vq_err(vq, "vhost_scsi_get_tag failed %ld\n", + PTR_ERR(cmd)); + vhost_scsi_send_bad_target(vs, vq, head, out); + continue; + } + cmd->tvc_vhost = vs; + cmd->tvc_vq = vq; + cmd->tvc_resp_iov = vq->iov[out]; + cmd->tvc_in_iovs = in; + + pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", + cmd->tvc_cdb[0], cmd->tvc_lun); + pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" + " %d\n", cmd, exp_data_len, prot_bytes, data_direction); + + if (data_direction != DMA_NONE) { + ret = vhost_scsi_mapal(cmd, + prot_bytes, &prot_iter, + exp_data_len, &data_iter); + if (unlikely(ret)) { + vq_err(vq, "Failed to map iov to sgl\n"); + vhost_scsi_release_cmd(&cmd->tvc_se_cmd); + vhost_scsi_send_bad_target(vs, vq, head, out); + continue; + } + } + /* + * Save the descriptor from vhost_get_vq_desc() to be used to + * complete the virtio-scsi request in TCM callback context via + * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() + */ + cmd->tvc_vq_desc = head; + /* + * Dispatch cmd descriptor for cmwq execution in process + * context provided by vhost_scsi_workqueue. This also ensures + * cmd is executed on the same kworker CPU as this vhost + * thread to gain positive L2 cache locality effects. + */ + INIT_WORK(&cmd->work, vhost_scsi_submission_work); + queue_work(vhost_scsi_workqueue, &cmd->work); + } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); +out: + mutex_unlock(&vq->mutex); +} + +static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) +{ + pr_debug("%s: The handling func for control queue.\n", __func__); +} + +static void +vhost_scsi_send_evt(struct vhost_scsi *vs, + struct vhost_scsi_tpg *tpg, + struct se_lun *lun, + u32 event, + u32 reason) +{ + struct vhost_scsi_evt *evt; + + evt = vhost_scsi_allocate_evt(vs, event, reason); + if (!evt) + return; + + if (tpg && lun) { + /* TODO: share lun setup code with virtio-scsi.ko */ + /* + * Note: evt->event is zeroed when we allocate it and + * lun[4-7] need to be zero according to virtio-scsi spec. + */ + evt->event.lun[0] = 0x01; + evt->event.lun[1] = tpg->tport_tpgt; + if (lun->unpacked_lun >= 256) + evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; + evt->event.lun[3] = lun->unpacked_lun & 0xFF; + } + + llist_add(&evt->list, &vs->vs_event_list); + vhost_work_queue(&vs->dev, &vs->vs_event_work); +} + +static void vhost_scsi_evt_handle_kick(struct vhost_work *work) +{ + struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, + poll.work); + struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); + + mutex_lock(&vq->mutex); + if (!vq->private_data) + goto out; + + if (vs->vs_events_missed) + vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); +out: + mutex_unlock(&vq->mutex); +} + +static void vhost_scsi_handle_kick(struct vhost_work *work) +{ + struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, + poll.work); + struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); + + vhost_scsi_handle_vq(vs, vq); +} + +static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) +{ + vhost_poll_flush(&vs->vqs[index].vq.poll); +} + +/* Callers must hold dev mutex */ +static void vhost_scsi_flush(struct vhost_scsi *vs) +{ + struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; + int i; + + /* Init new inflight and remember the old inflight */ + vhost_scsi_init_inflight(vs, old_inflight); + + /* + * The inflight->kref was initialized to 1. We decrement it here to + * indicate the start of the flush operation so that it will reach 0 + * when all the reqs are finished. + */ + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) + kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); + + /* Flush both the vhost poll and vhost work */ + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) + vhost_scsi_flush_vq(vs, i); + vhost_work_flush(&vs->dev, &vs->vs_completion_work); + vhost_work_flush(&vs->dev, &vs->vs_event_work); + + /* Wait for all reqs issued before the flush to be finished */ + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) + wait_for_completion(&old_inflight[i]->comp); +} + +/* + * Called from vhost_scsi_ioctl() context to walk the list of available + * vhost_scsi_tpg with an active struct vhost_scsi_nexus + * + * The lock nesting rule is: + * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex + */ +static int +vhost_scsi_set_endpoint(struct vhost_scsi *vs, + struct vhost_scsi_target *t) +{ + struct se_portal_group *se_tpg; + struct vhost_scsi_tport *tv_tport; + struct vhost_scsi_tpg *tpg; + struct vhost_scsi_tpg **vs_tpg; + struct vhost_virtqueue *vq; + int index, ret, i, len; + bool match = false; + + mutex_lock(&vhost_scsi_mutex); + mutex_lock(&vs->dev.mutex); + + /* Verify that ring has been setup correctly. */ + for (index = 0; index < vs->dev.nvqs; ++index) { + /* Verify that ring has been setup correctly. */ + if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { + ret = -EFAULT; + goto out; + } + } + + len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; + vs_tpg = kzalloc(len, GFP_KERNEL); + if (!vs_tpg) { + ret = -ENOMEM; + goto out; + } + if (vs->vs_tpg) + memcpy(vs_tpg, vs->vs_tpg, len); + + list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { + mutex_lock(&tpg->tv_tpg_mutex); + if (!tpg->tpg_nexus) { + mutex_unlock(&tpg->tv_tpg_mutex); + continue; + } + if (tpg->tv_tpg_vhost_count != 0) { + mutex_unlock(&tpg->tv_tpg_mutex); + continue; + } + tv_tport = tpg->tport; + + if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { + if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { + kfree(vs_tpg); + mutex_unlock(&tpg->tv_tpg_mutex); + ret = -EEXIST; + goto out; + } + /* + * In order to ensure individual vhost-scsi configfs + * groups cannot be removed while in use by vhost ioctl, + * go ahead and take an explicit se_tpg->tpg_group.cg_item + * dependency now. + */ + se_tpg = &tpg->se_tpg; + ret = target_depend_item(&se_tpg->tpg_group.cg_item); + if (ret) { + pr_warn("configfs_depend_item() failed: %d\n", ret); + kfree(vs_tpg); + mutex_unlock(&tpg->tv_tpg_mutex); + goto out; + } + tpg->tv_tpg_vhost_count++; + tpg->vhost_scsi = vs; + vs_tpg[tpg->tport_tpgt] = tpg; + smp_mb__after_atomic(); + match = true; + } + mutex_unlock(&tpg->tv_tpg_mutex); + } + + if (match) { + memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, + sizeof(vs->vs_vhost_wwpn)); + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { + vq = &vs->vqs[i].vq; + mutex_lock(&vq->mutex); + vq->private_data = vs_tpg; + vhost_vq_init_access(vq); + mutex_unlock(&vq->mutex); + } + ret = 0; + } else { + ret = -EEXIST; + } + + /* + * Act as synchronize_rcu to make sure access to + * old vs->vs_tpg is finished. + */ + vhost_scsi_flush(vs); + kfree(vs->vs_tpg); + vs->vs_tpg = vs_tpg; + +out: + mutex_unlock(&vs->dev.mutex); + mutex_unlock(&vhost_scsi_mutex); + return ret; +} + +static int +vhost_scsi_clear_endpoint(struct vhost_scsi *vs, + struct vhost_scsi_target *t) +{ + struct se_portal_group *se_tpg; + struct vhost_scsi_tport *tv_tport; + struct vhost_scsi_tpg *tpg; + struct vhost_virtqueue *vq; + bool match = false; + int index, ret, i; + u8 target; + + mutex_lock(&vhost_scsi_mutex); + mutex_lock(&vs->dev.mutex); + /* Verify that ring has been setup correctly. */ + for (index = 0; index < vs->dev.nvqs; ++index) { + if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { + ret = -EFAULT; + goto err_dev; + } + } + + if (!vs->vs_tpg) { + ret = 0; + goto err_dev; + } + + for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { + target = i; + tpg = vs->vs_tpg[target]; + if (!tpg) + continue; + + mutex_lock(&tpg->tv_tpg_mutex); + tv_tport = tpg->tport; + if (!tv_tport) { + ret = -ENODEV; + goto err_tpg; + } + + if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { + pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" + " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", + tv_tport->tport_name, tpg->tport_tpgt, + t->vhost_wwpn, t->vhost_tpgt); + ret = -EINVAL; + goto err_tpg; + } + tpg->tv_tpg_vhost_count--; + tpg->vhost_scsi = NULL; + vs->vs_tpg[target] = NULL; + match = true; + mutex_unlock(&tpg->tv_tpg_mutex); + /* + * Release se_tpg->tpg_group.cg_item configfs dependency now + * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. + */ + se_tpg = &tpg->se_tpg; + target_undepend_item(&se_tpg->tpg_group.cg_item); + } + if (match) { + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { + vq = &vs->vqs[i].vq; + mutex_lock(&vq->mutex); + vq->private_data = NULL; + mutex_unlock(&vq->mutex); + } + } + /* + * Act as synchronize_rcu to make sure access to + * old vs->vs_tpg is finished. + */ + vhost_scsi_flush(vs); + kfree(vs->vs_tpg); + vs->vs_tpg = NULL; + WARN_ON(vs->vs_events_nr); + mutex_unlock(&vs->dev.mutex); + mutex_unlock(&vhost_scsi_mutex); + return 0; + +err_tpg: + mutex_unlock(&tpg->tv_tpg_mutex); +err_dev: + mutex_unlock(&vs->dev.mutex); + mutex_unlock(&vhost_scsi_mutex); + return ret; +} + +static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) +{ + struct vhost_virtqueue *vq; + int i; + + if (features & ~VHOST_SCSI_FEATURES) + return -EOPNOTSUPP; + + mutex_lock(&vs->dev.mutex); + if ((features & (1 << VHOST_F_LOG_ALL)) && + !vhost_log_access_ok(&vs->dev)) { + mutex_unlock(&vs->dev.mutex); + return -EFAULT; + } + + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { + vq = &vs->vqs[i].vq; + mutex_lock(&vq->mutex); + vq->acked_features = features; + mutex_unlock(&vq->mutex); + } + mutex_unlock(&vs->dev.mutex); + return 0; +} + +static int vhost_scsi_open(struct inode *inode, struct file *f) +{ + struct vhost_scsi *vs; + struct vhost_virtqueue **vqs; + int r = -ENOMEM, i; + + vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL); + if (!vs) { + vs = vzalloc(sizeof(*vs)); + if (!vs) + goto err_vs; + } + + vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL); + if (!vqs) + goto err_vqs; + + vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); + vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); + + vs->vs_events_nr = 0; + vs->vs_events_missed = false; + + vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; + vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; + vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; + vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; + for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { + vqs[i] = &vs->vqs[i].vq; + vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; + } + vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ, UIO_MAXIOV, + VHOST_SCSI_WEIGHT, 0); + + vhost_scsi_init_inflight(vs, NULL); + + f->private_data = vs; + return 0; + +err_vqs: + kvfree(vs); +err_vs: + return r; +} + +static int vhost_scsi_release(struct inode *inode, struct file *f) +{ + struct vhost_scsi *vs = f->private_data; + struct vhost_scsi_target t; + + mutex_lock(&vs->dev.mutex); + memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); + mutex_unlock(&vs->dev.mutex); + vhost_scsi_clear_endpoint(vs, &t); + vhost_dev_stop(&vs->dev); + vhost_dev_cleanup(&vs->dev); + /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ + vhost_scsi_flush(vs); + kfree(vs->dev.vqs); + kvfree(vs); + return 0; +} + +static long +vhost_scsi_ioctl(struct file *f, + unsigned int ioctl, + unsigned long arg) +{ + struct vhost_scsi *vs = f->private_data; + struct vhost_scsi_target backend; + void __user *argp = (void __user *)arg; + u64 __user *featurep = argp; + u32 __user *eventsp = argp; + u32 events_missed; + u64 features; + int r, abi_version = VHOST_SCSI_ABI_VERSION; + struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; + + switch (ioctl) { + case VHOST_SCSI_SET_ENDPOINT: + if (copy_from_user(&backend, argp, sizeof backend)) + return -EFAULT; + if (backend.reserved != 0) + return -EOPNOTSUPP; + + return vhost_scsi_set_endpoint(vs, &backend); + case VHOST_SCSI_CLEAR_ENDPOINT: + if (copy_from_user(&backend, argp, sizeof backend)) + return -EFAULT; + if (backend.reserved != 0) + return -EOPNOTSUPP; + + return vhost_scsi_clear_endpoint(vs, &backend); + case VHOST_SCSI_GET_ABI_VERSION: + if (copy_to_user(argp, &abi_version, sizeof abi_version)) + return -EFAULT; + return 0; + case VHOST_SCSI_SET_EVENTS_MISSED: + if (get_user(events_missed, eventsp)) + return -EFAULT; + mutex_lock(&vq->mutex); + vs->vs_events_missed = events_missed; + mutex_unlock(&vq->mutex); + return 0; + case VHOST_SCSI_GET_EVENTS_MISSED: + mutex_lock(&vq->mutex); + events_missed = vs->vs_events_missed; + mutex_unlock(&vq->mutex); + if (put_user(events_missed, eventsp)) + return -EFAULT; + return 0; + case VHOST_GET_FEATURES: + features = VHOST_SCSI_FEATURES; + if (copy_to_user(featurep, &features, sizeof features)) + return -EFAULT; + return 0; + case VHOST_SET_FEATURES: + if (copy_from_user(&features, featurep, sizeof features)) + return -EFAULT; + return vhost_scsi_set_features(vs, features); + default: + mutex_lock(&vs->dev.mutex); + r = vhost_dev_ioctl(&vs->dev, ioctl, argp); + /* TODO: flush backend after dev ioctl. */ + if (r == -ENOIOCTLCMD) + r = vhost_vring_ioctl(&vs->dev, ioctl, argp); + mutex_unlock(&vs->dev.mutex); + return r; + } +} + +#ifdef CONFIG_COMPAT +static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, + unsigned long arg) +{ + return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); +} +#endif + +static const struct file_operations vhost_scsi_fops = { + .owner = THIS_MODULE, + .release = vhost_scsi_release, + .unlocked_ioctl = vhost_scsi_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = vhost_scsi_compat_ioctl, +#endif + .open = vhost_scsi_open, + .llseek = noop_llseek, +}; + +static struct miscdevice vhost_scsi_misc = { + MISC_DYNAMIC_MINOR, + "vhost-scsi", + &vhost_scsi_fops, +}; + +static int __init vhost_scsi_register(void) +{ + return misc_register(&vhost_scsi_misc); +} + +static void vhost_scsi_deregister(void) +{ + misc_deregister(&vhost_scsi_misc); +} + +static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) +{ + switch (tport->tport_proto_id) { + case SCSI_PROTOCOL_SAS: + return "SAS"; + case SCSI_PROTOCOL_FCP: + return "FCP"; + case SCSI_PROTOCOL_ISCSI: + return "iSCSI"; + default: + break; + } + + return "Unknown"; +} + +static void +vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, + struct se_lun *lun, bool plug) +{ + + struct vhost_scsi *vs = tpg->vhost_scsi; + struct vhost_virtqueue *vq; + u32 reason; + + if (!vs) + return; + + mutex_lock(&vs->dev.mutex); + + if (plug) + reason = VIRTIO_SCSI_EVT_RESET_RESCAN; + else + reason = VIRTIO_SCSI_EVT_RESET_REMOVED; + + vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; + mutex_lock(&vq->mutex); + if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) + vhost_scsi_send_evt(vs, tpg, lun, + VIRTIO_SCSI_T_TRANSPORT_RESET, reason); + mutex_unlock(&vq->mutex); + mutex_unlock(&vs->dev.mutex); +} + +static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) +{ + vhost_scsi_do_plug(tpg, lun, true); +} + +static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) +{ + vhost_scsi_do_plug(tpg, lun, false); +} + +static int vhost_scsi_port_link(struct se_portal_group *se_tpg, + struct se_lun *lun) +{ + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + + mutex_lock(&vhost_scsi_mutex); + + mutex_lock(&tpg->tv_tpg_mutex); + tpg->tv_tpg_port_count++; + mutex_unlock(&tpg->tv_tpg_mutex); + + vhost_scsi_hotplug(tpg, lun); + + mutex_unlock(&vhost_scsi_mutex); + + return 0; +} + +static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, + struct se_lun *lun) +{ + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + + mutex_lock(&vhost_scsi_mutex); + + mutex_lock(&tpg->tv_tpg_mutex); + tpg->tv_tpg_port_count--; + mutex_unlock(&tpg->tv_tpg_mutex); + + vhost_scsi_hotunplug(tpg, lun); + + mutex_unlock(&vhost_scsi_mutex); +} + +static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess) +{ + struct vhost_scsi_cmd *tv_cmd; + unsigned int i; + + if (!se_sess->sess_cmd_map) + return; + + for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { + tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; + + kfree(tv_cmd->tvc_sgl); + kfree(tv_cmd->tvc_prot_sgl); + kfree(tv_cmd->tvc_upages); + } +} + +static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( + struct config_item *item, const char *page, size_t count) +{ + struct se_portal_group *se_tpg = attrib_to_tpg(item); + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + unsigned long val; + int ret = kstrtoul(page, 0, &val); + + if (ret) { + pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); + return ret; + } + if (val != 0 && val != 1 && val != 3) { + pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); + return -EINVAL; + } + tpg->tv_fabric_prot_type = val; + + return count; +} + +static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( + struct config_item *item, char *page) +{ + struct se_portal_group *se_tpg = attrib_to_tpg(item); + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + + return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); +} + +CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); + +static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { + &vhost_scsi_tpg_attrib_attr_fabric_prot_type, + NULL, +}; + +static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg, + struct se_session *se_sess, void *p) +{ + struct vhost_scsi_cmd *tv_cmd; + unsigned int i; + + for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { + tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; + + tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS, + sizeof(struct scatterlist), + GFP_KERNEL); + if (!tv_cmd->tvc_sgl) { + pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); + goto out; + } + + tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES, + sizeof(struct page *), + GFP_KERNEL); + if (!tv_cmd->tvc_upages) { + pr_err("Unable to allocate tv_cmd->tvc_upages\n"); + goto out; + } + + tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS, + sizeof(struct scatterlist), + GFP_KERNEL); + if (!tv_cmd->tvc_prot_sgl) { + pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); + goto out; + } + } + return 0; +out: + vhost_scsi_free_cmd_map_res(se_sess); + return -ENOMEM; +} + +static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, + const char *name) +{ + struct vhost_scsi_nexus *tv_nexus; + + mutex_lock(&tpg->tv_tpg_mutex); + if (tpg->tpg_nexus) { + mutex_unlock(&tpg->tv_tpg_mutex); + pr_debug("tpg->tpg_nexus already exists\n"); + return -EEXIST; + } + + tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); + if (!tv_nexus) { + mutex_unlock(&tpg->tv_tpg_mutex); + pr_err("Unable to allocate struct vhost_scsi_nexus\n"); + return -ENOMEM; + } + /* + * Since we are running in 'demo mode' this call with generate a + * struct se_node_acl for the vhost_scsi struct se_portal_group with + * the SCSI Initiator port name of the passed configfs group 'name'. + */ + tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, + VHOST_SCSI_DEFAULT_TAGS, + sizeof(struct vhost_scsi_cmd), + TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, + (unsigned char *)name, tv_nexus, + vhost_scsi_nexus_cb); + if (IS_ERR(tv_nexus->tvn_se_sess)) { + mutex_unlock(&tpg->tv_tpg_mutex); + kfree(tv_nexus); + return -ENOMEM; + } + tpg->tpg_nexus = tv_nexus; + + mutex_unlock(&tpg->tv_tpg_mutex); + return 0; +} + +static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) +{ + struct se_session *se_sess; + struct vhost_scsi_nexus *tv_nexus; + + mutex_lock(&tpg->tv_tpg_mutex); + tv_nexus = tpg->tpg_nexus; + if (!tv_nexus) { + mutex_unlock(&tpg->tv_tpg_mutex); + return -ENODEV; + } + + se_sess = tv_nexus->tvn_se_sess; + if (!se_sess) { + mutex_unlock(&tpg->tv_tpg_mutex); + return -ENODEV; + } + + if (tpg->tv_tpg_port_count != 0) { + mutex_unlock(&tpg->tv_tpg_mutex); + pr_err("Unable to remove TCM_vhost I_T Nexus with" + " active TPG port count: %d\n", + tpg->tv_tpg_port_count); + return -EBUSY; + } + + if (tpg->tv_tpg_vhost_count != 0) { + mutex_unlock(&tpg->tv_tpg_mutex); + pr_err("Unable to remove TCM_vhost I_T Nexus with" + " active TPG vhost count: %d\n", + tpg->tv_tpg_vhost_count); + return -EBUSY; + } + + pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" + " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), + tv_nexus->tvn_se_sess->se_node_acl->initiatorname); + + vhost_scsi_free_cmd_map_res(se_sess); + /* + * Release the SCSI I_T Nexus to the emulated vhost Target Port + */ + target_remove_session(se_sess); + tpg->tpg_nexus = NULL; + mutex_unlock(&tpg->tv_tpg_mutex); + + kfree(tv_nexus); + return 0; +} + +static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) +{ + struct se_portal_group *se_tpg = to_tpg(item); + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + struct vhost_scsi_nexus *tv_nexus; + ssize_t ret; + + mutex_lock(&tpg->tv_tpg_mutex); + tv_nexus = tpg->tpg_nexus; + if (!tv_nexus) { + mutex_unlock(&tpg->tv_tpg_mutex); + return -ENODEV; + } + ret = snprintf(page, PAGE_SIZE, "%s\n", + tv_nexus->tvn_se_sess->se_node_acl->initiatorname); + mutex_unlock(&tpg->tv_tpg_mutex); + + return ret; +} + +static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_portal_group *se_tpg = to_tpg(item); + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + struct vhost_scsi_tport *tport_wwn = tpg->tport; + unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; + int ret; + /* + * Shutdown the active I_T nexus if 'NULL' is passed.. + */ + if (!strncmp(page, "NULL", 4)) { + ret = vhost_scsi_drop_nexus(tpg); + return (!ret) ? count : ret; + } + /* + * Otherwise make sure the passed virtual Initiator port WWN matches + * the fabric protocol_id set in vhost_scsi_make_tport(), and call + * vhost_scsi_make_nexus(). + */ + if (strlen(page) >= VHOST_SCSI_NAMELEN) { + pr_err("Emulated NAA Sas Address: %s, exceeds" + " max: %d\n", page, VHOST_SCSI_NAMELEN); + return -EINVAL; + } + snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); + + ptr = strstr(i_port, "naa."); + if (ptr) { + if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { + pr_err("Passed SAS Initiator Port %s does not" + " match target port protoid: %s\n", i_port, + vhost_scsi_dump_proto_id(tport_wwn)); + return -EINVAL; + } + port_ptr = &i_port[0]; + goto check_newline; + } + ptr = strstr(i_port, "fc."); + if (ptr) { + if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { + pr_err("Passed FCP Initiator Port %s does not" + " match target port protoid: %s\n", i_port, + vhost_scsi_dump_proto_id(tport_wwn)); + return -EINVAL; + } + port_ptr = &i_port[3]; /* Skip over "fc." */ + goto check_newline; + } + ptr = strstr(i_port, "iqn."); + if (ptr) { + if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { + pr_err("Passed iSCSI Initiator Port %s does not" + " match target port protoid: %s\n", i_port, + vhost_scsi_dump_proto_id(tport_wwn)); + return -EINVAL; + } + port_ptr = &i_port[0]; + goto check_newline; + } + pr_err("Unable to locate prefix for emulated Initiator Port:" + " %s\n", i_port); + return -EINVAL; + /* + * Clear any trailing newline for the NAA WWN + */ +check_newline: + if (i_port[strlen(i_port)-1] == '\n') + i_port[strlen(i_port)-1] = '\0'; + + ret = vhost_scsi_make_nexus(tpg, port_ptr); + if (ret < 0) + return ret; + + return count; +} + +CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); + +static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { + &vhost_scsi_tpg_attr_nexus, + NULL, +}; + +static struct se_portal_group * +vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name) +{ + struct vhost_scsi_tport *tport = container_of(wwn, + struct vhost_scsi_tport, tport_wwn); + + struct vhost_scsi_tpg *tpg; + u16 tpgt; + int ret; + + if (strstr(name, "tpgt_") != name) + return ERR_PTR(-EINVAL); + if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) + return ERR_PTR(-EINVAL); + + tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); + if (!tpg) { + pr_err("Unable to allocate struct vhost_scsi_tpg"); + return ERR_PTR(-ENOMEM); + } + mutex_init(&tpg->tv_tpg_mutex); + INIT_LIST_HEAD(&tpg->tv_tpg_list); + tpg->tport = tport; + tpg->tport_tpgt = tpgt; + + ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); + if (ret < 0) { + kfree(tpg); + return NULL; + } + mutex_lock(&vhost_scsi_mutex); + list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); + mutex_unlock(&vhost_scsi_mutex); + + return &tpg->se_tpg; +} + +static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) +{ + struct vhost_scsi_tpg *tpg = container_of(se_tpg, + struct vhost_scsi_tpg, se_tpg); + + mutex_lock(&vhost_scsi_mutex); + list_del(&tpg->tv_tpg_list); + mutex_unlock(&vhost_scsi_mutex); + /* + * Release the virtual I_T Nexus for this vhost TPG + */ + vhost_scsi_drop_nexus(tpg); + /* + * Deregister the se_tpg from TCM.. + */ + core_tpg_deregister(se_tpg); + kfree(tpg); +} + +static struct se_wwn * +vhost_scsi_make_tport(struct target_fabric_configfs *tf, + struct config_group *group, + const char *name) +{ + struct vhost_scsi_tport *tport; + char *ptr; + u64 wwpn = 0; + int off = 0; + + /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) + return ERR_PTR(-EINVAL); */ + + tport = kzalloc(sizeof(*tport), GFP_KERNEL); + if (!tport) { + pr_err("Unable to allocate struct vhost_scsi_tport"); + return ERR_PTR(-ENOMEM); + } + tport->tport_wwpn = wwpn; + /* + * Determine the emulated Protocol Identifier and Target Port Name + * based on the incoming configfs directory name. + */ + ptr = strstr(name, "naa."); + if (ptr) { + tport->tport_proto_id = SCSI_PROTOCOL_SAS; + goto check_len; + } + ptr = strstr(name, "fc."); + if (ptr) { + tport->tport_proto_id = SCSI_PROTOCOL_FCP; + off = 3; /* Skip over "fc." */ + goto check_len; + } + ptr = strstr(name, "iqn."); + if (ptr) { + tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; + goto check_len; + } + + pr_err("Unable to locate prefix for emulated Target Port:" + " %s\n", name); + kfree(tport); + return ERR_PTR(-EINVAL); + +check_len: + if (strlen(name) >= VHOST_SCSI_NAMELEN) { + pr_err("Emulated %s Address: %s, exceeds" + " max: %d\n", name, vhost_scsi_dump_proto_id(tport), + VHOST_SCSI_NAMELEN); + kfree(tport); + return ERR_PTR(-EINVAL); + } + snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); + + pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" + " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); + + return &tport->tport_wwn; +} + +static void vhost_scsi_drop_tport(struct se_wwn *wwn) +{ + struct vhost_scsi_tport *tport = container_of(wwn, + struct vhost_scsi_tport, tport_wwn); + + pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" + " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), + tport->tport_name); + + kfree(tport); +} + +static ssize_t +vhost_scsi_wwn_version_show(struct config_item *item, char *page) +{ + return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" + "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, + utsname()->machine); +} + +CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); + +static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { + &vhost_scsi_wwn_attr_version, + NULL, +}; + +static const struct target_core_fabric_ops vhost_scsi_ops = { + .module = THIS_MODULE, + .name = "vhost", + .get_fabric_name = vhost_scsi_get_fabric_name, + .tpg_get_wwn = vhost_scsi_get_fabric_wwn, + .tpg_get_tag = vhost_scsi_get_tpgt, + .tpg_check_demo_mode = vhost_scsi_check_true, + .tpg_check_demo_mode_cache = vhost_scsi_check_true, + .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, + .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, + .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, + .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, + .release_cmd = vhost_scsi_release_cmd, + .check_stop_free = vhost_scsi_check_stop_free, + .sess_get_index = vhost_scsi_sess_get_index, + .sess_get_initiator_sid = NULL, + .write_pending = vhost_scsi_write_pending, + .write_pending_status = vhost_scsi_write_pending_status, + .set_default_node_attributes = vhost_scsi_set_default_node_attrs, + .get_cmd_state = vhost_scsi_get_cmd_state, + .queue_data_in = vhost_scsi_queue_data_in, + .queue_status = vhost_scsi_queue_status, + .queue_tm_rsp = vhost_scsi_queue_tm_rsp, + .aborted_task = vhost_scsi_aborted_task, + /* + * Setup callers for generic logic in target_core_fabric_configfs.c + */ + .fabric_make_wwn = vhost_scsi_make_tport, + .fabric_drop_wwn = vhost_scsi_drop_tport, + .fabric_make_tpg = vhost_scsi_make_tpg, + .fabric_drop_tpg = vhost_scsi_drop_tpg, + .fabric_post_link = vhost_scsi_port_link, + .fabric_pre_unlink = vhost_scsi_port_unlink, + + .tfc_wwn_attrs = vhost_scsi_wwn_attrs, + .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, + .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, +}; + +static int __init vhost_scsi_init(void) +{ + int ret = -ENOMEM; + + pr_debug("TCM_VHOST fabric module %s on %s/%s" + " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, + utsname()->machine); + + /* + * Use our own dedicated workqueue for submitting I/O into + * target core to avoid contention within system_wq. + */ + vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); + if (!vhost_scsi_workqueue) + goto out; + + ret = vhost_scsi_register(); + if (ret < 0) + goto out_destroy_workqueue; + + ret = target_register_template(&vhost_scsi_ops); + if (ret < 0) + goto out_vhost_scsi_deregister; + + return 0; + +out_vhost_scsi_deregister: + vhost_scsi_deregister(); +out_destroy_workqueue: + destroy_workqueue(vhost_scsi_workqueue); +out: + return ret; +}; + +static void vhost_scsi_exit(void) +{ + target_unregister_template(&vhost_scsi_ops); + vhost_scsi_deregister(); + destroy_workqueue(vhost_scsi_workqueue); +}; + +MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); +MODULE_ALIAS("tcm_vhost"); +MODULE_LICENSE("GPL"); +module_init(vhost_scsi_init); +module_exit(vhost_scsi_exit); |