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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/infiniband/ulp/srpt
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/infiniband/ulp/srpt')
-rw-r--r--drivers/infiniband/ulp/srpt/Kconfig13
-rw-r--r--drivers/infiniband/ulp/srpt/Makefile2
-rw-r--r--drivers/infiniband/ulp/srpt/ib_dm_mad.h139
-rw-r--r--drivers/infiniband/ulp/srpt/ib_srpt.c3958
-rw-r--r--drivers/infiniband/ulp/srpt/ib_srpt.h469
5 files changed, 4581 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/srpt/Kconfig b/drivers/infiniband/ulp/srpt/Kconfig
new file mode 100644
index 000000000..4b5d9b792
--- /dev/null
+++ b/drivers/infiniband/ulp/srpt/Kconfig
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config INFINIBAND_SRPT
+ tristate "InfiniBand SCSI RDMA Protocol target support"
+ depends on INFINIBAND && INFINIBAND_ADDR_TRANS && TARGET_CORE
+ help
+
+ Support for the SCSI RDMA Protocol (SRP) Target driver. The
+ SRP protocol is a protocol that allows an initiator to access
+ a block storage device on another host (target) over a network
+ that supports the RDMA protocol. Currently the RDMA protocol is
+ supported by InfiniBand and by iWarp network hardware. More
+ information about the SRP protocol can be found on the website
+ of the INCITS T10 technical committee (http://www.t10.org/).
diff --git a/drivers/infiniband/ulp/srpt/Makefile b/drivers/infiniband/ulp/srpt/Makefile
new file mode 100644
index 000000000..2d137928a
--- /dev/null
+++ b/drivers/infiniband/ulp/srpt/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_INFINIBAND_SRPT) += ib_srpt.o
diff --git a/drivers/infiniband/ulp/srpt/ib_dm_mad.h b/drivers/infiniband/ulp/srpt/ib_dm_mad.h
new file mode 100644
index 000000000..fb1de1f6f
--- /dev/null
+++ b/drivers/infiniband/ulp/srpt/ib_dm_mad.h
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifndef IB_DM_MAD_H
+#define IB_DM_MAD_H
+
+#include <linux/types.h>
+
+#include <rdma/ib_mad.h>
+
+enum {
+ /*
+ * See also section 13.4.7 Status Field, table 115 MAD Common Status
+ * Field Bit Values and also section 16.3.1.1 Status Field in the
+ * InfiniBand Architecture Specification.
+ */
+ DM_MAD_STATUS_UNSUP_METHOD = 0x0008,
+ DM_MAD_STATUS_UNSUP_METHOD_ATTR = 0x000c,
+ DM_MAD_STATUS_INVALID_FIELD = 0x001c,
+ DM_MAD_STATUS_NO_IOC = 0x0100,
+
+ /*
+ * See also the Device Management chapter, section 16.3.3 Attributes,
+ * table 279 Device Management Attributes in the InfiniBand
+ * Architecture Specification.
+ */
+ DM_ATTR_CLASS_PORT_INFO = 0x01,
+ DM_ATTR_IOU_INFO = 0x10,
+ DM_ATTR_IOC_PROFILE = 0x11,
+ DM_ATTR_SVC_ENTRIES = 0x12
+};
+
+struct ib_dm_hdr {
+ u8 reserved[28];
+};
+
+/*
+ * Structure of management datagram sent by the SRP target implementation.
+ * Contains a management datagram header, reliable multi-packet transaction
+ * protocol (RMPP) header and ib_dm_hdr. Notes:
+ * - The SRP target implementation does not use RMPP or ib_dm_hdr when sending
+ * management datagrams.
+ * - The header size must be exactly 64 bytes (IB_MGMT_DEVICE_HDR), since this
+ * is the header size that is passed to ib_create_send_mad() in ib_srpt.c.
+ * - The maximum supported size for a management datagram when not using RMPP
+ * is 256 bytes -- 64 bytes header and 192 (IB_MGMT_DEVICE_DATA) bytes data.
+ */
+struct ib_dm_mad {
+ struct ib_mad_hdr mad_hdr;
+ struct ib_rmpp_hdr rmpp_hdr;
+ struct ib_dm_hdr dm_hdr;
+ u8 data[IB_MGMT_DEVICE_DATA];
+};
+
+/*
+ * IOUnitInfo as defined in section 16.3.3.3 IOUnitInfo of the InfiniBand
+ * Architecture Specification.
+ */
+struct ib_dm_iou_info {
+ __be16 change_id;
+ u8 max_controllers;
+ u8 op_rom;
+ u8 controller_list[128];
+};
+
+/*
+ * IOControllerprofile as defined in section 16.3.3.4 IOControllerProfile of
+ * the InfiniBand Architecture Specification.
+ */
+struct ib_dm_ioc_profile {
+ __be64 guid;
+ __be32 vendor_id;
+ __be32 device_id;
+ __be16 device_version;
+ __be16 reserved1;
+ __be32 subsys_vendor_id;
+ __be32 subsys_device_id;
+ __be16 io_class;
+ __be16 io_subclass;
+ __be16 protocol;
+ __be16 protocol_version;
+ __be16 service_conn;
+ __be16 initiators_supported;
+ __be16 send_queue_depth;
+ u8 reserved2;
+ u8 rdma_read_depth;
+ __be32 send_size;
+ __be32 rdma_size;
+ u8 op_cap_mask;
+ u8 svc_cap_mask;
+ u8 num_svc_entries;
+ u8 reserved3[9];
+ u8 id_string[64];
+};
+
+struct ib_dm_svc_entry {
+ u8 name[40];
+ __be64 id;
+};
+
+/*
+ * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
+ * Specification. See also section B.7, table B.8 in the T10 SRP r16a document.
+ */
+struct ib_dm_svc_entries {
+ struct ib_dm_svc_entry service_entries[4];
+};
+
+#endif
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
new file mode 100644
index 000000000..25e799dba
--- /dev/null
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -0,0 +1,3958 @@
+/*
+ * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
+ * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/ctype.h>
+#include <linux/kthread.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/atomic.h>
+#include <linux/inet.h>
+#include <rdma/ib_cache.h>
+#include <scsi/scsi_proto.h>
+#include <scsi/scsi_tcq.h>
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+#include "ib_srpt.h"
+
+/* Name of this kernel module. */
+#define DRV_NAME "ib_srpt"
+
+#define SRPT_ID_STRING "Linux SRP target"
+
+#undef pr_fmt
+#define pr_fmt(fmt) DRV_NAME " " fmt
+
+MODULE_AUTHOR("Vu Pham and Bart Van Assche");
+MODULE_DESCRIPTION("SCSI RDMA Protocol target driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+/*
+ * Global Variables
+ */
+
+static u64 srpt_service_guid;
+static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */
+static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */
+
+static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
+module_param(srp_max_req_size, int, 0444);
+MODULE_PARM_DESC(srp_max_req_size,
+ "Maximum size of SRP request messages in bytes.");
+
+static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
+module_param(srpt_srq_size, int, 0444);
+MODULE_PARM_DESC(srpt_srq_size,
+ "Shared receive queue (SRQ) size.");
+
+static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp)
+{
+ return sprintf(buffer, "0x%016llx\n", *(u64 *)kp->arg);
+}
+module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
+ 0444);
+MODULE_PARM_DESC(srpt_service_guid,
+ "Using this value for ioc_guid, id_ext, and cm_listen_id instead of using the node_guid of the first HCA.");
+
+static struct ib_client srpt_client;
+/* Protects both rdma_cm_port and rdma_cm_id. */
+static DEFINE_MUTEX(rdma_cm_mutex);
+/* Port number RDMA/CM will bind to. */
+static u16 rdma_cm_port;
+static struct rdma_cm_id *rdma_cm_id;
+static void srpt_release_cmd(struct se_cmd *se_cmd);
+static void srpt_free_ch(struct kref *kref);
+static int srpt_queue_status(struct se_cmd *cmd);
+static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
+static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
+static void srpt_process_wait_list(struct srpt_rdma_ch *ch);
+
+/*
+ * The only allowed channel state changes are those that change the channel
+ * state into a state with a higher numerical value. Hence the new > prev test.
+ */
+static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new)
+{
+ unsigned long flags;
+ enum rdma_ch_state prev;
+ bool changed = false;
+
+ spin_lock_irqsave(&ch->spinlock, flags);
+ prev = ch->state;
+ if (new > prev) {
+ ch->state = new;
+ changed = true;
+ }
+ spin_unlock_irqrestore(&ch->spinlock, flags);
+
+ return changed;
+}
+
+/**
+ * srpt_event_handler - asynchronous IB event callback function
+ * @handler: IB event handler registered by ib_register_event_handler().
+ * @event: Description of the event that occurred.
+ *
+ * Callback function called by the InfiniBand core when an asynchronous IB
+ * event occurs. This callback may occur in interrupt context. See also
+ * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
+ * Architecture Specification.
+ */
+static void srpt_event_handler(struct ib_event_handler *handler,
+ struct ib_event *event)
+{
+ struct srpt_device *sdev =
+ container_of(handler, struct srpt_device, event_handler);
+ struct srpt_port *sport;
+ u8 port_num;
+
+ pr_debug("ASYNC event= %d on device= %s\n", event->event,
+ dev_name(&sdev->device->dev));
+
+ switch (event->event) {
+ case IB_EVENT_PORT_ERR:
+ port_num = event->element.port_num - 1;
+ if (port_num < sdev->device->phys_port_cnt) {
+ sport = &sdev->port[port_num];
+ sport->lid = 0;
+ sport->sm_lid = 0;
+ } else {
+ WARN(true, "event %d: port_num %d out of range 1..%d\n",
+ event->event, port_num + 1,
+ sdev->device->phys_port_cnt);
+ }
+ break;
+ case IB_EVENT_PORT_ACTIVE:
+ case IB_EVENT_LID_CHANGE:
+ case IB_EVENT_PKEY_CHANGE:
+ case IB_EVENT_SM_CHANGE:
+ case IB_EVENT_CLIENT_REREGISTER:
+ case IB_EVENT_GID_CHANGE:
+ /* Refresh port data asynchronously. */
+ port_num = event->element.port_num - 1;
+ if (port_num < sdev->device->phys_port_cnt) {
+ sport = &sdev->port[port_num];
+ if (!sport->lid && !sport->sm_lid)
+ schedule_work(&sport->work);
+ } else {
+ WARN(true, "event %d: port_num %d out of range 1..%d\n",
+ event->event, port_num + 1,
+ sdev->device->phys_port_cnt);
+ }
+ break;
+ default:
+ pr_err("received unrecognized IB event %d\n", event->event);
+ break;
+ }
+}
+
+/**
+ * srpt_srq_event - SRQ event callback function
+ * @event: Description of the event that occurred.
+ * @ctx: Context pointer specified at SRQ creation time.
+ */
+static void srpt_srq_event(struct ib_event *event, void *ctx)
+{
+ pr_debug("SRQ event %d\n", event->event);
+}
+
+static const char *get_ch_state_name(enum rdma_ch_state s)
+{
+ switch (s) {
+ case CH_CONNECTING:
+ return "connecting";
+ case CH_LIVE:
+ return "live";
+ case CH_DISCONNECTING:
+ return "disconnecting";
+ case CH_DRAINING:
+ return "draining";
+ case CH_DISCONNECTED:
+ return "disconnected";
+ }
+ return "???";
+}
+
+/**
+ * srpt_qp_event - QP event callback function
+ * @event: Description of the event that occurred.
+ * @ch: SRPT RDMA channel.
+ */
+static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
+{
+ pr_debug("QP event %d on ch=%p sess_name=%s-%d state=%s\n",
+ event->event, ch, ch->sess_name, ch->qp->qp_num,
+ get_ch_state_name(ch->state));
+
+ switch (event->event) {
+ case IB_EVENT_COMM_EST:
+ if (ch->using_rdma_cm)
+ rdma_notify(ch->rdma_cm.cm_id, event->event);
+ else
+ ib_cm_notify(ch->ib_cm.cm_id, event->event);
+ break;
+ case IB_EVENT_QP_LAST_WQE_REACHED:
+ pr_debug("%s-%d, state %s: received Last WQE event.\n",
+ ch->sess_name, ch->qp->qp_num,
+ get_ch_state_name(ch->state));
+ break;
+ default:
+ pr_err("received unrecognized IB QP event %d\n", event->event);
+ break;
+ }
+}
+
+/**
+ * srpt_set_ioc - initialize a IOUnitInfo structure
+ * @c_list: controller list.
+ * @slot: one-based slot number.
+ * @value: four-bit value.
+ *
+ * Copies the lowest four bits of value in element slot of the array of four
+ * bit elements called c_list (controller list). The index slot is one-based.
+ */
+static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
+{
+ u16 id;
+ u8 tmp;
+
+ id = (slot - 1) / 2;
+ if (slot & 0x1) {
+ tmp = c_list[id] & 0xf;
+ c_list[id] = (value << 4) | tmp;
+ } else {
+ tmp = c_list[id] & 0xf0;
+ c_list[id] = (value & 0xf) | tmp;
+ }
+}
+
+/**
+ * srpt_get_class_port_info - copy ClassPortInfo to a management datagram
+ * @mad: Datagram that will be sent as response to DM_ATTR_CLASS_PORT_INFO.
+ *
+ * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
+ * Specification.
+ */
+static void srpt_get_class_port_info(struct ib_dm_mad *mad)
+{
+ struct ib_class_port_info *cif;
+
+ cif = (struct ib_class_port_info *)mad->data;
+ memset(cif, 0, sizeof(*cif));
+ cif->base_version = 1;
+ cif->class_version = 1;
+
+ ib_set_cpi_resp_time(cif, 20);
+ mad->mad_hdr.status = 0;
+}
+
+/**
+ * srpt_get_iou - write IOUnitInfo to a management datagram
+ * @mad: Datagram that will be sent as response to DM_ATTR_IOU_INFO.
+ *
+ * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
+ * Specification. See also section B.7, table B.6 in the SRP r16a document.
+ */
+static void srpt_get_iou(struct ib_dm_mad *mad)
+{
+ struct ib_dm_iou_info *ioui;
+ u8 slot;
+ int i;
+
+ ioui = (struct ib_dm_iou_info *)mad->data;
+ ioui->change_id = cpu_to_be16(1);
+ ioui->max_controllers = 16;
+
+ /* set present for slot 1 and empty for the rest */
+ srpt_set_ioc(ioui->controller_list, 1, 1);
+ for (i = 1, slot = 2; i < 16; i++, slot++)
+ srpt_set_ioc(ioui->controller_list, slot, 0);
+
+ mad->mad_hdr.status = 0;
+}
+
+/**
+ * srpt_get_ioc - write IOControllerprofile to a management datagram
+ * @sport: HCA port through which the MAD has been received.
+ * @slot: Slot number specified in DM_ATTR_IOC_PROFILE query.
+ * @mad: Datagram that will be sent as response to DM_ATTR_IOC_PROFILE.
+ *
+ * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
+ * Architecture Specification. See also section B.7, table B.7 in the SRP
+ * r16a document.
+ */
+static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
+ struct ib_dm_mad *mad)
+{
+ struct srpt_device *sdev = sport->sdev;
+ struct ib_dm_ioc_profile *iocp;
+ int send_queue_depth;
+
+ iocp = (struct ib_dm_ioc_profile *)mad->data;
+
+ if (!slot || slot > 16) {
+ mad->mad_hdr.status
+ = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
+ return;
+ }
+
+ if (slot > 2) {
+ mad->mad_hdr.status
+ = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
+ return;
+ }
+
+ if (sdev->use_srq)
+ send_queue_depth = sdev->srq_size;
+ else
+ send_queue_depth = min(MAX_SRPT_RQ_SIZE,
+ sdev->device->attrs.max_qp_wr);
+
+ memset(iocp, 0, sizeof(*iocp));
+ strcpy(iocp->id_string, SRPT_ID_STRING);
+ iocp->guid = cpu_to_be64(srpt_service_guid);
+ iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
+ iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);
+ iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);
+ iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
+ iocp->subsys_device_id = 0x0;
+ iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
+ iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
+ iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
+ iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
+ iocp->send_queue_depth = cpu_to_be16(send_queue_depth);
+ iocp->rdma_read_depth = 4;
+ iocp->send_size = cpu_to_be32(srp_max_req_size);
+ iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
+ 1U << 24));
+ iocp->num_svc_entries = 1;
+ iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
+ SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
+
+ mad->mad_hdr.status = 0;
+}
+
+/**
+ * srpt_get_svc_entries - write ServiceEntries to a management datagram
+ * @ioc_guid: I/O controller GUID to use in reply.
+ * @slot: I/O controller number.
+ * @hi: End of the range of service entries to be specified in the reply.
+ * @lo: Start of the range of service entries to be specified in the reply..
+ * @mad: Datagram that will be sent as response to DM_ATTR_SVC_ENTRIES.
+ *
+ * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
+ * Specification. See also section B.7, table B.8 in the SRP r16a document.
+ */
+static void srpt_get_svc_entries(u64 ioc_guid,
+ u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
+{
+ struct ib_dm_svc_entries *svc_entries;
+
+ WARN_ON(!ioc_guid);
+
+ if (!slot || slot > 16) {
+ mad->mad_hdr.status
+ = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
+ return;
+ }
+
+ if (slot > 2 || lo > hi || hi > 1) {
+ mad->mad_hdr.status
+ = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
+ return;
+ }
+
+ svc_entries = (struct ib_dm_svc_entries *)mad->data;
+ memset(svc_entries, 0, sizeof(*svc_entries));
+ svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
+ snprintf(svc_entries->service_entries[0].name,
+ sizeof(svc_entries->service_entries[0].name),
+ "%s%016llx",
+ SRP_SERVICE_NAME_PREFIX,
+ ioc_guid);
+
+ mad->mad_hdr.status = 0;
+}
+
+/**
+ * srpt_mgmt_method_get - process a received management datagram
+ * @sp: HCA port through which the MAD has been received.
+ * @rq_mad: received MAD.
+ * @rsp_mad: response MAD.
+ */
+static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
+ struct ib_dm_mad *rsp_mad)
+{
+ u16 attr_id;
+ u32 slot;
+ u8 hi, lo;
+
+ attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
+ switch (attr_id) {
+ case DM_ATTR_CLASS_PORT_INFO:
+ srpt_get_class_port_info(rsp_mad);
+ break;
+ case DM_ATTR_IOU_INFO:
+ srpt_get_iou(rsp_mad);
+ break;
+ case DM_ATTR_IOC_PROFILE:
+ slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
+ srpt_get_ioc(sp, slot, rsp_mad);
+ break;
+ case DM_ATTR_SVC_ENTRIES:
+ slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
+ hi = (u8) ((slot >> 8) & 0xff);
+ lo = (u8) (slot & 0xff);
+ slot = (u16) ((slot >> 16) & 0xffff);
+ srpt_get_svc_entries(srpt_service_guid,
+ slot, hi, lo, rsp_mad);
+ break;
+ default:
+ rsp_mad->mad_hdr.status =
+ cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
+ break;
+ }
+}
+
+/**
+ * srpt_mad_send_handler - MAD send completion callback
+ * @mad_agent: Return value of ib_register_mad_agent().
+ * @mad_wc: Work completion reporting that the MAD has been sent.
+ */
+static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
+ struct ib_mad_send_wc *mad_wc)
+{
+ rdma_destroy_ah(mad_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE);
+ ib_free_send_mad(mad_wc->send_buf);
+}
+
+/**
+ * srpt_mad_recv_handler - MAD reception callback function
+ * @mad_agent: Return value of ib_register_mad_agent().
+ * @send_buf: Not used.
+ * @mad_wc: Work completion reporting that a MAD has been received.
+ */
+static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
+ struct ib_mad_send_buf *send_buf,
+ struct ib_mad_recv_wc *mad_wc)
+{
+ struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
+ struct ib_ah *ah;
+ struct ib_mad_send_buf *rsp;
+ struct ib_dm_mad *dm_mad;
+
+ if (!mad_wc || !mad_wc->recv_buf.mad)
+ return;
+
+ ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
+ mad_wc->recv_buf.grh, mad_agent->port_num);
+ if (IS_ERR(ah))
+ goto err;
+
+ BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
+
+ rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
+ mad_wc->wc->pkey_index, 0,
+ IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
+ GFP_KERNEL,
+ IB_MGMT_BASE_VERSION);
+ if (IS_ERR(rsp))
+ goto err_rsp;
+
+ rsp->ah = ah;
+
+ dm_mad = rsp->mad;
+ memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad));
+ dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
+ dm_mad->mad_hdr.status = 0;
+
+ switch (mad_wc->recv_buf.mad->mad_hdr.method) {
+ case IB_MGMT_METHOD_GET:
+ srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
+ break;
+ case IB_MGMT_METHOD_SET:
+ dm_mad->mad_hdr.status =
+ cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
+ break;
+ default:
+ dm_mad->mad_hdr.status =
+ cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
+ break;
+ }
+
+ if (!ib_post_send_mad(rsp, NULL)) {
+ ib_free_recv_mad(mad_wc);
+ /* will destroy_ah & free_send_mad in send completion */
+ return;
+ }
+
+ ib_free_send_mad(rsp);
+
+err_rsp:
+ rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
+err:
+ ib_free_recv_mad(mad_wc);
+}
+
+static int srpt_format_guid(char *buf, unsigned int size, const __be64 *guid)
+{
+ const __be16 *g = (const __be16 *)guid;
+
+ return snprintf(buf, size, "%04x:%04x:%04x:%04x",
+ be16_to_cpu(g[0]), be16_to_cpu(g[1]),
+ be16_to_cpu(g[2]), be16_to_cpu(g[3]));
+}
+
+/**
+ * srpt_refresh_port - configure a HCA port
+ * @sport: SRPT HCA port.
+ *
+ * Enable InfiniBand management datagram processing, update the cached sm_lid,
+ * lid and gid values, and register a callback function for processing MADs
+ * on the specified port.
+ *
+ * Note: It is safe to call this function more than once for the same port.
+ */
+static int srpt_refresh_port(struct srpt_port *sport)
+{
+ struct ib_mad_agent *mad_agent;
+ struct ib_mad_reg_req reg_req;
+ struct ib_port_modify port_modify;
+ struct ib_port_attr port_attr;
+ int ret;
+
+ ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
+ if (ret)
+ return ret;
+
+ sport->sm_lid = port_attr.sm_lid;
+ sport->lid = port_attr.lid;
+
+ ret = rdma_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
+ if (ret)
+ return ret;
+
+ srpt_format_guid(sport->guid_name, ARRAY_SIZE(sport->guid_name),
+ &sport->gid.global.interface_id);
+ snprintf(sport->gid_name, ARRAY_SIZE(sport->gid_name),
+ "0x%016llx%016llx",
+ be64_to_cpu(sport->gid.global.subnet_prefix),
+ be64_to_cpu(sport->gid.global.interface_id));
+
+ if (rdma_protocol_iwarp(sport->sdev->device, sport->port))
+ return 0;
+
+ memset(&port_modify, 0, sizeof(port_modify));
+ port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
+ port_modify.clr_port_cap_mask = 0;
+
+ ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
+ if (ret) {
+ pr_warn("%s-%d: enabling device management failed (%d). Note: this is expected if SR-IOV is enabled.\n",
+ dev_name(&sport->sdev->device->dev), sport->port, ret);
+ return 0;
+ }
+
+ if (!sport->mad_agent) {
+ memset(&reg_req, 0, sizeof(reg_req));
+ reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
+ reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
+ set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
+ set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
+
+ mad_agent = ib_register_mad_agent(sport->sdev->device,
+ sport->port,
+ IB_QPT_GSI,
+ &reg_req, 0,
+ srpt_mad_send_handler,
+ srpt_mad_recv_handler,
+ sport, 0);
+ if (IS_ERR(mad_agent)) {
+ pr_err("%s-%d: MAD agent registration failed (%ld). Note: this is expected if SR-IOV is enabled.\n",
+ dev_name(&sport->sdev->device->dev), sport->port,
+ PTR_ERR(mad_agent));
+ sport->mad_agent = NULL;
+ memset(&port_modify, 0, sizeof(port_modify));
+ port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
+ ib_modify_port(sport->sdev->device, sport->port, 0,
+ &port_modify);
+ return 0;
+ }
+
+ sport->mad_agent = mad_agent;
+ }
+
+ return 0;
+}
+
+/**
+ * srpt_unregister_mad_agent - unregister MAD callback functions
+ * @sdev: SRPT HCA pointer.
+ * @port_cnt: number of ports with registered MAD
+ *
+ * Note: It is safe to call this function more than once for the same device.
+ */
+static void srpt_unregister_mad_agent(struct srpt_device *sdev, int port_cnt)
+{
+ struct ib_port_modify port_modify = {
+ .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
+ };
+ struct srpt_port *sport;
+ int i;
+
+ for (i = 1; i <= port_cnt; i++) {
+ sport = &sdev->port[i - 1];
+ WARN_ON(sport->port != i);
+ if (sport->mad_agent) {
+ ib_modify_port(sdev->device, i, 0, &port_modify);
+ ib_unregister_mad_agent(sport->mad_agent);
+ sport->mad_agent = NULL;
+ }
+ }
+}
+
+/**
+ * srpt_alloc_ioctx - allocate a SRPT I/O context structure
+ * @sdev: SRPT HCA pointer.
+ * @ioctx_size: I/O context size.
+ * @buf_cache: I/O buffer cache.
+ * @dir: DMA data direction.
+ */
+static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
+ int ioctx_size,
+ struct kmem_cache *buf_cache,
+ enum dma_data_direction dir)
+{
+ struct srpt_ioctx *ioctx;
+
+ ioctx = kzalloc(ioctx_size, GFP_KERNEL);
+ if (!ioctx)
+ goto err;
+
+ ioctx->buf = kmem_cache_alloc(buf_cache, GFP_KERNEL);
+ if (!ioctx->buf)
+ goto err_free_ioctx;
+
+ ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf,
+ kmem_cache_size(buf_cache), dir);
+ if (ib_dma_mapping_error(sdev->device, ioctx->dma))
+ goto err_free_buf;
+
+ return ioctx;
+
+err_free_buf:
+ kmem_cache_free(buf_cache, ioctx->buf);
+err_free_ioctx:
+ kfree(ioctx);
+err:
+ return NULL;
+}
+
+/**
+ * srpt_free_ioctx - free a SRPT I/O context structure
+ * @sdev: SRPT HCA pointer.
+ * @ioctx: I/O context pointer.
+ * @buf_cache: I/O buffer cache.
+ * @dir: DMA data direction.
+ */
+static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
+ struct kmem_cache *buf_cache,
+ enum dma_data_direction dir)
+{
+ if (!ioctx)
+ return;
+
+ ib_dma_unmap_single(sdev->device, ioctx->dma,
+ kmem_cache_size(buf_cache), dir);
+ kmem_cache_free(buf_cache, ioctx->buf);
+ kfree(ioctx);
+}
+
+/**
+ * srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures
+ * @sdev: Device to allocate the I/O context ring for.
+ * @ring_size: Number of elements in the I/O context ring.
+ * @ioctx_size: I/O context size.
+ * @buf_cache: I/O buffer cache.
+ * @alignment_offset: Offset in each ring buffer at which the SRP information
+ * unit starts.
+ * @dir: DMA data direction.
+ */
+static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
+ int ring_size, int ioctx_size,
+ struct kmem_cache *buf_cache,
+ int alignment_offset,
+ enum dma_data_direction dir)
+{
+ struct srpt_ioctx **ring;
+ int i;
+
+ WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) &&
+ ioctx_size != sizeof(struct srpt_send_ioctx));
+
+ ring = kvmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL);
+ if (!ring)
+ goto out;
+ for (i = 0; i < ring_size; ++i) {
+ ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, buf_cache, dir);
+ if (!ring[i])
+ goto err;
+ ring[i]->index = i;
+ ring[i]->offset = alignment_offset;
+ }
+ goto out;
+
+err:
+ while (--i >= 0)
+ srpt_free_ioctx(sdev, ring[i], buf_cache, dir);
+ kvfree(ring);
+ ring = NULL;
+out:
+ return ring;
+}
+
+/**
+ * srpt_free_ioctx_ring - free the ring of SRPT I/O context structures
+ * @ioctx_ring: I/O context ring to be freed.
+ * @sdev: SRPT HCA pointer.
+ * @ring_size: Number of ring elements.
+ * @buf_cache: I/O buffer cache.
+ * @dir: DMA data direction.
+ */
+static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
+ struct srpt_device *sdev, int ring_size,
+ struct kmem_cache *buf_cache,
+ enum dma_data_direction dir)
+{
+ int i;
+
+ if (!ioctx_ring)
+ return;
+
+ for (i = 0; i < ring_size; ++i)
+ srpt_free_ioctx(sdev, ioctx_ring[i], buf_cache, dir);
+ kvfree(ioctx_ring);
+}
+
+/**
+ * srpt_set_cmd_state - set the state of a SCSI command
+ * @ioctx: Send I/O context.
+ * @new: New I/O context state.
+ *
+ * Does not modify the state of aborted commands. Returns the previous command
+ * state.
+ */
+static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
+ enum srpt_command_state new)
+{
+ enum srpt_command_state previous;
+
+ previous = ioctx->state;
+ if (previous != SRPT_STATE_DONE)
+ ioctx->state = new;
+
+ return previous;
+}
+
+/**
+ * srpt_test_and_set_cmd_state - test and set the state of a command
+ * @ioctx: Send I/O context.
+ * @old: Current I/O context state.
+ * @new: New I/O context state.
+ *
+ * Returns true if and only if the previous command state was equal to 'old'.
+ */
+static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
+ enum srpt_command_state old,
+ enum srpt_command_state new)
+{
+ enum srpt_command_state previous;
+
+ WARN_ON(!ioctx);
+ WARN_ON(old == SRPT_STATE_DONE);
+ WARN_ON(new == SRPT_STATE_NEW);
+
+ previous = ioctx->state;
+ if (previous == old)
+ ioctx->state = new;
+
+ return previous == old;
+}
+
+/**
+ * srpt_post_recv - post an IB receive request
+ * @sdev: SRPT HCA pointer.
+ * @ch: SRPT RDMA channel.
+ * @ioctx: Receive I/O context pointer.
+ */
+static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,
+ struct srpt_recv_ioctx *ioctx)
+{
+ struct ib_sge list;
+ struct ib_recv_wr wr;
+
+ BUG_ON(!sdev);
+ list.addr = ioctx->ioctx.dma + ioctx->ioctx.offset;
+ list.length = srp_max_req_size;
+ list.lkey = sdev->lkey;
+
+ ioctx->ioctx.cqe.done = srpt_recv_done;
+ wr.wr_cqe = &ioctx->ioctx.cqe;
+ wr.next = NULL;
+ wr.sg_list = &list;
+ wr.num_sge = 1;
+
+ if (sdev->use_srq)
+ return ib_post_srq_recv(sdev->srq, &wr, NULL);
+ else
+ return ib_post_recv(ch->qp, &wr, NULL);
+}
+
+/**
+ * srpt_zerolength_write - perform a zero-length RDMA write
+ * @ch: SRPT RDMA channel.
+ *
+ * A quote from the InfiniBand specification: C9-88: For an HCA responder
+ * using Reliable Connection service, for each zero-length RDMA READ or WRITE
+ * request, the R_Key shall not be validated, even if the request includes
+ * Immediate data.
+ */
+static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
+{
+ struct ib_rdma_wr wr = {
+ .wr = {
+ .next = NULL,
+ { .wr_cqe = &ch->zw_cqe, },
+ .opcode = IB_WR_RDMA_WRITE,
+ .send_flags = IB_SEND_SIGNALED,
+ }
+ };
+
+ pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
+ ch->qp->qp_num);
+
+ return ib_post_send(ch->qp, &wr.wr, NULL);
+}
+
+static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct srpt_rdma_ch *ch = wc->qp->qp_context;
+
+ pr_debug("%s-%d wc->status %d\n", ch->sess_name, ch->qp->qp_num,
+ wc->status);
+
+ if (wc->status == IB_WC_SUCCESS) {
+ srpt_process_wait_list(ch);
+ } else {
+ if (srpt_set_ch_state(ch, CH_DISCONNECTED))
+ schedule_work(&ch->release_work);
+ else
+ pr_debug("%s-%d: already disconnected.\n",
+ ch->sess_name, ch->qp->qp_num);
+ }
+}
+
+static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
+ struct srp_direct_buf *db, int nbufs, struct scatterlist **sg,
+ unsigned *sg_cnt)
+{
+ enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
+ struct srpt_rdma_ch *ch = ioctx->ch;
+ struct scatterlist *prev = NULL;
+ unsigned prev_nents;
+ int ret, i;
+
+ if (nbufs == 1) {
+ ioctx->rw_ctxs = &ioctx->s_rw_ctx;
+ } else {
+ ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs),
+ GFP_KERNEL);
+ if (!ioctx->rw_ctxs)
+ return -ENOMEM;
+ }
+
+ for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) {
+ struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
+ u64 remote_addr = be64_to_cpu(db->va);
+ u32 size = be32_to_cpu(db->len);
+ u32 rkey = be32_to_cpu(db->key);
+
+ ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false,
+ i < nbufs - 1);
+ if (ret)
+ goto unwind;
+
+ ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port,
+ ctx->sg, ctx->nents, 0, remote_addr, rkey, dir);
+ if (ret < 0) {
+ target_free_sgl(ctx->sg, ctx->nents);
+ goto unwind;
+ }
+
+ ioctx->n_rdma += ret;
+ ioctx->n_rw_ctx++;
+
+ if (prev) {
+ sg_unmark_end(&prev[prev_nents - 1]);
+ sg_chain(prev, prev_nents + 1, ctx->sg);
+ } else {
+ *sg = ctx->sg;
+ }
+
+ prev = ctx->sg;
+ prev_nents = ctx->nents;
+
+ *sg_cnt += ctx->nents;
+ }
+
+ return 0;
+
+unwind:
+ while (--i >= 0) {
+ struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
+
+ rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
+ ctx->sg, ctx->nents, dir);
+ target_free_sgl(ctx->sg, ctx->nents);
+ }
+ if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
+ kfree(ioctx->rw_ctxs);
+ return ret;
+}
+
+static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch,
+ struct srpt_send_ioctx *ioctx)
+{
+ enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
+ int i;
+
+ for (i = 0; i < ioctx->n_rw_ctx; i++) {
+ struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
+
+ rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
+ ctx->sg, ctx->nents, dir);
+ target_free_sgl(ctx->sg, ctx->nents);
+ }
+
+ if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
+ kfree(ioctx->rw_ctxs);
+}
+
+static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
+{
+ /*
+ * The pointer computations below will only be compiled correctly
+ * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
+ * whether srp_cmd::add_data has been declared as a byte pointer.
+ */
+ BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&
+ !__same_type(srp_cmd->add_data[0], (u8)0));
+
+ /*
+ * According to the SRP spec, the lower two bits of the 'ADDITIONAL
+ * CDB LENGTH' field are reserved and the size in bytes of this field
+ * is four times the value specified in bits 3..7. Hence the "& ~3".
+ */
+ return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3);
+}
+
+/**
+ * srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request
+ * @recv_ioctx: I/O context associated with the received command @srp_cmd.
+ * @ioctx: I/O context that will be used for responding to the initiator.
+ * @srp_cmd: Pointer to the SRP_CMD request data.
+ * @dir: Pointer to the variable to which the transfer direction will be
+ * written.
+ * @sg: [out] scatterlist for the parsed SRP_CMD.
+ * @sg_cnt: [out] length of @sg.
+ * @data_len: Pointer to the variable to which the total data length of all
+ * descriptors in the SRP_CMD request will be written.
+ * @imm_data_offset: [in] Offset in SRP_CMD requests at which immediate data
+ * starts.
+ *
+ * This function initializes ioctx->nrbuf and ioctx->r_bufs.
+ *
+ * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
+ * -ENOMEM when memory allocation fails and zero upon success.
+ */
+static int srpt_get_desc_tbl(struct srpt_recv_ioctx *recv_ioctx,
+ struct srpt_send_ioctx *ioctx,
+ struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
+ struct scatterlist **sg, unsigned int *sg_cnt, u64 *data_len,
+ u16 imm_data_offset)
+{
+ BUG_ON(!dir);
+ BUG_ON(!data_len);
+
+ /*
+ * The lower four bits of the buffer format field contain the DATA-IN
+ * buffer descriptor format, and the highest four bits contain the
+ * DATA-OUT buffer descriptor format.
+ */
+ if (srp_cmd->buf_fmt & 0xf)
+ /* DATA-IN: transfer data from target to initiator (read). */
+ *dir = DMA_FROM_DEVICE;
+ else if (srp_cmd->buf_fmt >> 4)
+ /* DATA-OUT: transfer data from initiator to target (write). */
+ *dir = DMA_TO_DEVICE;
+ else
+ *dir = DMA_NONE;
+
+ /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
+ ioctx->cmd.data_direction = *dir;
+
+ if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
+ ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
+ struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd);
+
+ *data_len = be32_to_cpu(db->len);
+ return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt);
+ } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
+ ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
+ struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd);
+ int nbufs = be32_to_cpu(idb->table_desc.len) /
+ sizeof(struct srp_direct_buf);
+
+ if (nbufs >
+ (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
+ pr_err("received unsupported SRP_CMD request type (%u out + %u in != %u / %zu)\n",
+ srp_cmd->data_out_desc_cnt,
+ srp_cmd->data_in_desc_cnt,
+ be32_to_cpu(idb->table_desc.len),
+ sizeof(struct srp_direct_buf));
+ return -EINVAL;
+ }
+
+ *data_len = be32_to_cpu(idb->len);
+ return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs,
+ sg, sg_cnt);
+ } else if ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_IMM) {
+ struct srp_imm_buf *imm_buf = srpt_get_desc_buf(srp_cmd);
+ void *data = (void *)srp_cmd + imm_data_offset;
+ uint32_t len = be32_to_cpu(imm_buf->len);
+ uint32_t req_size = imm_data_offset + len;
+
+ if (req_size > srp_max_req_size) {
+ pr_err("Immediate data (length %d + %d) exceeds request size %d\n",
+ imm_data_offset, len, srp_max_req_size);
+ return -EINVAL;
+ }
+ if (recv_ioctx->byte_len < req_size) {
+ pr_err("Received too few data - %d < %d\n",
+ recv_ioctx->byte_len, req_size);
+ return -EIO;
+ }
+ /*
+ * The immediate data buffer descriptor must occur before the
+ * immediate data itself.
+ */
+ if ((void *)(imm_buf + 1) > (void *)data) {
+ pr_err("Received invalid write request\n");
+ return -EINVAL;
+ }
+ *data_len = len;
+ ioctx->recv_ioctx = recv_ioctx;
+ if ((uintptr_t)data & 511) {
+ pr_warn_once("Internal error - the receive buffers are not aligned properly.\n");
+ return -EINVAL;
+ }
+ sg_init_one(&ioctx->imm_sg, data, len);
+ *sg = &ioctx->imm_sg;
+ *sg_cnt = 1;
+ return 0;
+ } else {
+ *data_len = 0;
+ return 0;
+ }
+}
+
+/**
+ * srpt_init_ch_qp - initialize queue pair attributes
+ * @ch: SRPT RDMA channel.
+ * @qp: Queue pair pointer.
+ *
+ * Initialized the attributes of queue pair 'qp' by allowing local write,
+ * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
+ */
+static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
+{
+ struct ib_qp_attr *attr;
+ int ret;
+
+ WARN_ON_ONCE(ch->using_rdma_cm);
+
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+ if (!attr)
+ return -ENOMEM;
+
+ attr->qp_state = IB_QPS_INIT;
+ attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;
+ attr->port_num = ch->sport->port;
+
+ ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port,
+ ch->pkey, &attr->pkey_index);
+ if (ret < 0)
+ pr_err("Translating pkey %#x failed (%d) - using index 0\n",
+ ch->pkey, ret);
+
+ ret = ib_modify_qp(qp, attr,
+ IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
+ IB_QP_PKEY_INDEX);
+
+ kfree(attr);
+ return ret;
+}
+
+/**
+ * srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR)
+ * @ch: channel of the queue pair.
+ * @qp: queue pair to change the state of.
+ *
+ * Returns zero upon success and a negative value upon failure.
+ *
+ * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
+ * If this structure ever becomes larger, it might be necessary to allocate
+ * it dynamically instead of on the stack.
+ */
+static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
+{
+ struct ib_qp_attr qp_attr;
+ int attr_mask;
+ int ret;
+
+ WARN_ON_ONCE(ch->using_rdma_cm);
+
+ qp_attr.qp_state = IB_QPS_RTR;
+ ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);
+ if (ret)
+ goto out;
+
+ qp_attr.max_dest_rd_atomic = 4;
+
+ ret = ib_modify_qp(qp, &qp_attr, attr_mask);
+
+out:
+ return ret;
+}
+
+/**
+ * srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS)
+ * @ch: channel of the queue pair.
+ * @qp: queue pair to change the state of.
+ *
+ * Returns zero upon success and a negative value upon failure.
+ *
+ * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
+ * If this structure ever becomes larger, it might be necessary to allocate
+ * it dynamically instead of on the stack.
+ */
+static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
+{
+ struct ib_qp_attr qp_attr;
+ int attr_mask;
+ int ret;
+
+ qp_attr.qp_state = IB_QPS_RTS;
+ ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);
+ if (ret)
+ goto out;
+
+ qp_attr.max_rd_atomic = 4;
+
+ ret = ib_modify_qp(qp, &qp_attr, attr_mask);
+
+out:
+ return ret;
+}
+
+/**
+ * srpt_ch_qp_err - set the channel queue pair state to 'error'
+ * @ch: SRPT RDMA channel.
+ */
+static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
+{
+ struct ib_qp_attr qp_attr;
+
+ qp_attr.qp_state = IB_QPS_ERR;
+ return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
+}
+
+/**
+ * srpt_get_send_ioctx - obtain an I/O context for sending to the initiator
+ * @ch: SRPT RDMA channel.
+ */
+static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
+{
+ struct srpt_send_ioctx *ioctx;
+ int tag, cpu;
+
+ BUG_ON(!ch);
+
+ tag = sbitmap_queue_get(&ch->sess->sess_tag_pool, &cpu);
+ if (tag < 0)
+ return NULL;
+
+ ioctx = ch->ioctx_ring[tag];
+ BUG_ON(ioctx->ch != ch);
+ ioctx->state = SRPT_STATE_NEW;
+ WARN_ON_ONCE(ioctx->recv_ioctx);
+ ioctx->n_rdma = 0;
+ ioctx->n_rw_ctx = 0;
+ ioctx->queue_status_only = false;
+ /*
+ * transport_init_se_cmd() does not initialize all fields, so do it
+ * here.
+ */
+ memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
+ memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
+ ioctx->cmd.map_tag = tag;
+ ioctx->cmd.map_cpu = cpu;
+
+ return ioctx;
+}
+
+/**
+ * srpt_abort_cmd - abort a SCSI command
+ * @ioctx: I/O context associated with the SCSI command.
+ */
+static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
+{
+ enum srpt_command_state state;
+
+ BUG_ON(!ioctx);
+
+ /*
+ * If the command is in a state where the target core is waiting for
+ * the ib_srpt driver, change the state to the next state.
+ */
+
+ state = ioctx->state;
+ switch (state) {
+ case SRPT_STATE_NEED_DATA:
+ ioctx->state = SRPT_STATE_DATA_IN;
+ break;
+ case SRPT_STATE_CMD_RSP_SENT:
+ case SRPT_STATE_MGMT_RSP_SENT:
+ ioctx->state = SRPT_STATE_DONE;
+ break;
+ default:
+ WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
+ __func__, state);
+ break;
+ }
+
+ pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state,
+ ioctx->state, ioctx->cmd.tag);
+
+ switch (state) {
+ case SRPT_STATE_NEW:
+ case SRPT_STATE_DATA_IN:
+ case SRPT_STATE_MGMT:
+ case SRPT_STATE_DONE:
+ /*
+ * Do nothing - defer abort processing until
+ * srpt_queue_response() is invoked.
+ */
+ break;
+ case SRPT_STATE_NEED_DATA:
+ pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);
+ transport_generic_request_failure(&ioctx->cmd,
+ TCM_CHECK_CONDITION_ABORT_CMD);
+ break;
+ case SRPT_STATE_CMD_RSP_SENT:
+ /*
+ * SRP_RSP sending failed or the SRP_RSP send completion has
+ * not been received in time.
+ */
+ transport_generic_free_cmd(&ioctx->cmd, 0);
+ break;
+ case SRPT_STATE_MGMT_RSP_SENT:
+ transport_generic_free_cmd(&ioctx->cmd, 0);
+ break;
+ default:
+ WARN(1, "Unexpected command state (%d)", state);
+ break;
+ }
+
+ return state;
+}
+
+/**
+ * srpt_rdma_read_done - RDMA read completion callback
+ * @cq: Completion queue.
+ * @wc: Work completion.
+ *
+ * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
+ * the data that has been transferred via IB RDMA had to be postponed until the
+ * check_stop_free() callback. None of this is necessary anymore and needs to
+ * be cleaned up.
+ */
+static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct srpt_rdma_ch *ch = wc->qp->qp_context;
+ struct srpt_send_ioctx *ioctx =
+ container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
+
+ WARN_ON(ioctx->n_rdma <= 0);
+ atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
+ ioctx->n_rdma = 0;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
+ ioctx, wc->status);
+ srpt_abort_cmd(ioctx);
+ return;
+ }
+
+ if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
+ SRPT_STATE_DATA_IN))
+ target_execute_cmd(&ioctx->cmd);
+ else
+ pr_err("%s[%d]: wrong state = %d\n", __func__,
+ __LINE__, ioctx->state);
+}
+
+/**
+ * srpt_build_cmd_rsp - build a SRP_RSP response
+ * @ch: RDMA channel through which the request has been received.
+ * @ioctx: I/O context associated with the SRP_CMD request. The response will
+ * be built in the buffer ioctx->buf points at and hence this function will
+ * overwrite the request data.
+ * @tag: tag of the request for which this response is being generated.
+ * @status: value for the STATUS field of the SRP_RSP information unit.
+ *
+ * Returns the size in bytes of the SRP_RSP response.
+ *
+ * An SRP_RSP response contains a SCSI status or service response. See also
+ * section 6.9 in the SRP r16a document for the format of an SRP_RSP
+ * response. See also SPC-2 for more information about sense data.
+ */
+static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
+ struct srpt_send_ioctx *ioctx, u64 tag,
+ int status)
+{
+ struct se_cmd *cmd = &ioctx->cmd;
+ struct srp_rsp *srp_rsp;
+ const u8 *sense_data;
+ int sense_data_len, max_sense_len;
+ u32 resid = cmd->residual_count;
+
+ /*
+ * The lowest bit of all SAM-3 status codes is zero (see also
+ * paragraph 5.3 in SAM-3).
+ */
+ WARN_ON(status & 1);
+
+ srp_rsp = ioctx->ioctx.buf;
+ BUG_ON(!srp_rsp);
+
+ sense_data = ioctx->sense_data;
+ sense_data_len = ioctx->cmd.scsi_sense_length;
+ WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
+
+ memset(srp_rsp, 0, sizeof(*srp_rsp));
+ srp_rsp->opcode = SRP_RSP;
+ srp_rsp->req_lim_delta =
+ cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
+ srp_rsp->tag = tag;
+ srp_rsp->status = status;
+
+ if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
+ if (cmd->data_direction == DMA_TO_DEVICE) {
+ /* residual data from an underflow write */
+ srp_rsp->flags = SRP_RSP_FLAG_DOUNDER;
+ srp_rsp->data_out_res_cnt = cpu_to_be32(resid);
+ } else if (cmd->data_direction == DMA_FROM_DEVICE) {
+ /* residual data from an underflow read */
+ srp_rsp->flags = SRP_RSP_FLAG_DIUNDER;
+ srp_rsp->data_in_res_cnt = cpu_to_be32(resid);
+ }
+ } else if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
+ if (cmd->data_direction == DMA_TO_DEVICE) {
+ /* residual data from an overflow write */
+ srp_rsp->flags = SRP_RSP_FLAG_DOOVER;
+ srp_rsp->data_out_res_cnt = cpu_to_be32(resid);
+ } else if (cmd->data_direction == DMA_FROM_DEVICE) {
+ /* residual data from an overflow read */
+ srp_rsp->flags = SRP_RSP_FLAG_DIOVER;
+ srp_rsp->data_in_res_cnt = cpu_to_be32(resid);
+ }
+ }
+
+ if (sense_data_len) {
+ BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
+ max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
+ if (sense_data_len > max_sense_len) {
+ pr_warn("truncated sense data from %d to %d bytes\n",
+ sense_data_len, max_sense_len);
+ sense_data_len = max_sense_len;
+ }
+
+ srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
+ srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
+ memcpy(srp_rsp->data, sense_data, sense_data_len);
+ }
+
+ return sizeof(*srp_rsp) + sense_data_len;
+}
+
+/**
+ * srpt_build_tskmgmt_rsp - build a task management response
+ * @ch: RDMA channel through which the request has been received.
+ * @ioctx: I/O context in which the SRP_RSP response will be built.
+ * @rsp_code: RSP_CODE that will be stored in the response.
+ * @tag: Tag of the request for which this response is being generated.
+ *
+ * Returns the size in bytes of the SRP_RSP response.
+ *
+ * An SRP_RSP response contains a SCSI status or service response. See also
+ * section 6.9 in the SRP r16a document for the format of an SRP_RSP
+ * response.
+ */
+static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
+ struct srpt_send_ioctx *ioctx,
+ u8 rsp_code, u64 tag)
+{
+ struct srp_rsp *srp_rsp;
+ int resp_data_len;
+ int resp_len;
+
+ resp_data_len = 4;
+ resp_len = sizeof(*srp_rsp) + resp_data_len;
+
+ srp_rsp = ioctx->ioctx.buf;
+ BUG_ON(!srp_rsp);
+ memset(srp_rsp, 0, sizeof(*srp_rsp));
+
+ srp_rsp->opcode = SRP_RSP;
+ srp_rsp->req_lim_delta =
+ cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
+ srp_rsp->tag = tag;
+
+ srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
+ srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
+ srp_rsp->data[3] = rsp_code;
+
+ return resp_len;
+}
+
+static int srpt_check_stop_free(struct se_cmd *cmd)
+{
+ struct srpt_send_ioctx *ioctx = container_of(cmd,
+ struct srpt_send_ioctx, cmd);
+
+ return target_put_sess_cmd(&ioctx->cmd);
+}
+
+/**
+ * srpt_handle_cmd - process a SRP_CMD information unit
+ * @ch: SRPT RDMA channel.
+ * @recv_ioctx: Receive I/O context.
+ * @send_ioctx: Send I/O context.
+ */
+static void srpt_handle_cmd(struct srpt_rdma_ch *ch,
+ struct srpt_recv_ioctx *recv_ioctx,
+ struct srpt_send_ioctx *send_ioctx)
+{
+ struct se_cmd *cmd;
+ struct srp_cmd *srp_cmd;
+ struct scatterlist *sg = NULL;
+ unsigned sg_cnt = 0;
+ u64 data_len;
+ enum dma_data_direction dir;
+ int rc;
+
+ BUG_ON(!send_ioctx);
+
+ srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
+ cmd = &send_ioctx->cmd;
+ cmd->tag = srp_cmd->tag;
+
+ switch (srp_cmd->task_attr) {
+ case SRP_CMD_SIMPLE_Q:
+ cmd->sam_task_attr = TCM_SIMPLE_TAG;
+ break;
+ case SRP_CMD_ORDERED_Q:
+ default:
+ cmd->sam_task_attr = TCM_ORDERED_TAG;
+ break;
+ case SRP_CMD_HEAD_OF_Q:
+ cmd->sam_task_attr = TCM_HEAD_TAG;
+ break;
+ case SRP_CMD_ACA:
+ cmd->sam_task_attr = TCM_ACA_TAG;
+ break;
+ }
+
+ rc = srpt_get_desc_tbl(recv_ioctx, send_ioctx, srp_cmd, &dir,
+ &sg, &sg_cnt, &data_len, ch->imm_data_offset);
+ if (rc) {
+ if (rc != -EAGAIN) {
+ pr_err("0x%llx: parsing SRP descriptor table failed.\n",
+ srp_cmd->tag);
+ }
+ goto busy;
+ }
+
+ rc = target_init_cmd(cmd, ch->sess, &send_ioctx->sense_data[0],
+ scsilun_to_int(&srp_cmd->lun), data_len,
+ TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF);
+ if (rc != 0) {
+ pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,
+ srp_cmd->tag);
+ goto busy;
+ }
+
+ if (target_submit_prep(cmd, srp_cmd->cdb, sg, sg_cnt, NULL, 0, NULL, 0,
+ GFP_KERNEL))
+ return;
+
+ target_submit(cmd);
+ return;
+
+busy:
+ target_send_busy(cmd);
+}
+
+static int srp_tmr_to_tcm(int fn)
+{
+ switch (fn) {
+ case SRP_TSK_ABORT_TASK:
+ return TMR_ABORT_TASK;
+ case SRP_TSK_ABORT_TASK_SET:
+ return TMR_ABORT_TASK_SET;
+ case SRP_TSK_CLEAR_TASK_SET:
+ return TMR_CLEAR_TASK_SET;
+ case SRP_TSK_LUN_RESET:
+ return TMR_LUN_RESET;
+ case SRP_TSK_CLEAR_ACA:
+ return TMR_CLEAR_ACA;
+ default:
+ return -1;
+ }
+}
+
+/**
+ * srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit
+ * @ch: SRPT RDMA channel.
+ * @recv_ioctx: Receive I/O context.
+ * @send_ioctx: Send I/O context.
+ *
+ * Returns 0 if and only if the request will be processed by the target core.
+ *
+ * For more information about SRP_TSK_MGMT information units, see also section
+ * 6.7 in the SRP r16a document.
+ */
+static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
+ struct srpt_recv_ioctx *recv_ioctx,
+ struct srpt_send_ioctx *send_ioctx)
+{
+ struct srp_tsk_mgmt *srp_tsk;
+ struct se_cmd *cmd;
+ struct se_session *sess = ch->sess;
+ int tcm_tmr;
+ int rc;
+
+ BUG_ON(!send_ioctx);
+
+ srp_tsk = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
+ cmd = &send_ioctx->cmd;
+
+ pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n",
+ srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, ch,
+ ch->sess);
+
+ srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
+ send_ioctx->cmd.tag = srp_tsk->tag;
+ tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
+ rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,
+ scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,
+ GFP_KERNEL, srp_tsk->task_tag,
+ TARGET_SCF_ACK_KREF);
+ if (rc != 0) {
+ send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
+ cmd->se_tfo->queue_tm_rsp(cmd);
+ }
+ return;
+}
+
+/**
+ * srpt_handle_new_iu - process a newly received information unit
+ * @ch: RDMA channel through which the information unit has been received.
+ * @recv_ioctx: Receive I/O context associated with the information unit.
+ */
+static bool
+srpt_handle_new_iu(struct srpt_rdma_ch *ch, struct srpt_recv_ioctx *recv_ioctx)
+{
+ struct srpt_send_ioctx *send_ioctx = NULL;
+ struct srp_cmd *srp_cmd;
+ bool res = false;
+ u8 opcode;
+
+ BUG_ON(!ch);
+ BUG_ON(!recv_ioctx);
+
+ if (unlikely(ch->state == CH_CONNECTING))
+ goto push;
+
+ ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
+ recv_ioctx->ioctx.dma,
+ recv_ioctx->ioctx.offset + srp_max_req_size,
+ DMA_FROM_DEVICE);
+
+ srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
+ opcode = srp_cmd->opcode;
+ if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) {
+ send_ioctx = srpt_get_send_ioctx(ch);
+ if (unlikely(!send_ioctx))
+ goto push;
+ }
+
+ if (!list_empty(&recv_ioctx->wait_list)) {
+ WARN_ON_ONCE(!ch->processing_wait_list);
+ list_del_init(&recv_ioctx->wait_list);
+ }
+
+ switch (opcode) {
+ case SRP_CMD:
+ srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
+ break;
+ case SRP_TSK_MGMT:
+ srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
+ break;
+ case SRP_I_LOGOUT:
+ pr_err("Not yet implemented: SRP_I_LOGOUT\n");
+ break;
+ case SRP_CRED_RSP:
+ pr_debug("received SRP_CRED_RSP\n");
+ break;
+ case SRP_AER_RSP:
+ pr_debug("received SRP_AER_RSP\n");
+ break;
+ case SRP_RSP:
+ pr_err("Received SRP_RSP\n");
+ break;
+ default:
+ pr_err("received IU with unknown opcode 0x%x\n", opcode);
+ break;
+ }
+
+ if (!send_ioctx || !send_ioctx->recv_ioctx)
+ srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);
+ res = true;
+
+out:
+ return res;
+
+push:
+ if (list_empty(&recv_ioctx->wait_list)) {
+ WARN_ON_ONCE(ch->processing_wait_list);
+ list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
+ }
+ goto out;
+}
+
+static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct srpt_rdma_ch *ch = wc->qp->qp_context;
+ struct srpt_recv_ioctx *ioctx =
+ container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
+
+ if (wc->status == IB_WC_SUCCESS) {
+ int req_lim;
+
+ req_lim = atomic_dec_return(&ch->req_lim);
+ if (unlikely(req_lim < 0))
+ pr_err("req_lim = %d < 0\n", req_lim);
+ ioctx->byte_len = wc->byte_len;
+ srpt_handle_new_iu(ch, ioctx);
+ } else {
+ pr_info_ratelimited("receiving failed for ioctx %p with status %d\n",
+ ioctx, wc->status);
+ }
+}
+
+/*
+ * This function must be called from the context in which RDMA completions are
+ * processed because it accesses the wait list without protection against
+ * access from other threads.
+ */
+static void srpt_process_wait_list(struct srpt_rdma_ch *ch)
+{
+ struct srpt_recv_ioctx *recv_ioctx, *tmp;
+
+ WARN_ON_ONCE(ch->state == CH_CONNECTING);
+
+ if (list_empty(&ch->cmd_wait_list))
+ return;
+
+ WARN_ON_ONCE(ch->processing_wait_list);
+ ch->processing_wait_list = true;
+ list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list,
+ wait_list) {
+ if (!srpt_handle_new_iu(ch, recv_ioctx))
+ break;
+ }
+ ch->processing_wait_list = false;
+}
+
+/**
+ * srpt_send_done - send completion callback
+ * @cq: Completion queue.
+ * @wc: Work completion.
+ *
+ * Note: Although this has not yet been observed during tests, at least in
+ * theory it is possible that the srpt_get_send_ioctx() call invoked by
+ * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
+ * value in each response is set to one, and it is possible that this response
+ * makes the initiator send a new request before the send completion for that
+ * response has been processed. This could e.g. happen if the call to
+ * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
+ * if IB retransmission causes generation of the send completion to be
+ * delayed. Incoming information units for which srpt_get_send_ioctx() fails
+ * are queued on cmd_wait_list. The code below processes these delayed
+ * requests one at a time.
+ */
+static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct srpt_rdma_ch *ch = wc->qp->qp_context;
+ struct srpt_send_ioctx *ioctx =
+ container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
+ enum srpt_command_state state;
+
+ state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
+
+ WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
+ state != SRPT_STATE_MGMT_RSP_SENT);
+
+ atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
+
+ if (wc->status != IB_WC_SUCCESS)
+ pr_info("sending response for ioctx 0x%p failed with status %d\n",
+ ioctx, wc->status);
+
+ if (state != SRPT_STATE_DONE) {
+ transport_generic_free_cmd(&ioctx->cmd, 0);
+ } else {
+ pr_err("IB completion has been received too late for wr_id = %u.\n",
+ ioctx->ioctx.index);
+ }
+
+ srpt_process_wait_list(ch);
+}
+
+/**
+ * srpt_create_ch_ib - create receive and send completion queues
+ * @ch: SRPT RDMA channel.
+ */
+static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
+{
+ struct ib_qp_init_attr *qp_init;
+ struct srpt_port *sport = ch->sport;
+ struct srpt_device *sdev = sport->sdev;
+ const struct ib_device_attr *attrs = &sdev->device->attrs;
+ int sq_size = sport->port_attrib.srp_sq_size;
+ int i, ret;
+
+ WARN_ON(ch->rq_size < 1);
+
+ ret = -ENOMEM;
+ qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);
+ if (!qp_init)
+ goto out;
+
+retry:
+ ch->cq = ib_cq_pool_get(sdev->device, ch->rq_size + sq_size, -1,
+ IB_POLL_WORKQUEUE);
+ if (IS_ERR(ch->cq)) {
+ ret = PTR_ERR(ch->cq);
+ pr_err("failed to create CQ cqe= %d ret= %d\n",
+ ch->rq_size + sq_size, ret);
+ goto out;
+ }
+ ch->cq_size = ch->rq_size + sq_size;
+
+ qp_init->qp_context = (void *)ch;
+ qp_init->event_handler
+ = (void(*)(struct ib_event *, void*))srpt_qp_event;
+ qp_init->send_cq = ch->cq;
+ qp_init->recv_cq = ch->cq;
+ qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
+ qp_init->qp_type = IB_QPT_RC;
+ /*
+ * We divide up our send queue size into half SEND WRs to send the
+ * completions, and half R/W contexts to actually do the RDMA
+ * READ/WRITE transfers. Note that we need to allocate CQ slots for
+ * both both, as RDMA contexts will also post completions for the
+ * RDMA READ case.
+ */
+ qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr);
+ qp_init->cap.max_rdma_ctxs = sq_size / 2;
+ qp_init->cap.max_send_sge = attrs->max_send_sge;
+ qp_init->cap.max_recv_sge = 1;
+ qp_init->port_num = ch->sport->port;
+ if (sdev->use_srq)
+ qp_init->srq = sdev->srq;
+ else
+ qp_init->cap.max_recv_wr = ch->rq_size;
+
+ if (ch->using_rdma_cm) {
+ ret = rdma_create_qp(ch->rdma_cm.cm_id, sdev->pd, qp_init);
+ ch->qp = ch->rdma_cm.cm_id->qp;
+ } else {
+ ch->qp = ib_create_qp(sdev->pd, qp_init);
+ if (!IS_ERR(ch->qp)) {
+ ret = srpt_init_ch_qp(ch, ch->qp);
+ if (ret)
+ ib_destroy_qp(ch->qp);
+ } else {
+ ret = PTR_ERR(ch->qp);
+ }
+ }
+ if (ret) {
+ bool retry = sq_size > MIN_SRPT_SQ_SIZE;
+
+ if (retry) {
+ pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n",
+ sq_size, ret);
+ ib_cq_pool_put(ch->cq, ch->cq_size);
+ sq_size = max(sq_size / 2, MIN_SRPT_SQ_SIZE);
+ goto retry;
+ } else {
+ pr_err("failed to create queue pair with sq_size = %d (%d)\n",
+ sq_size, ret);
+ goto err_destroy_cq;
+ }
+ }
+
+ atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
+
+ pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n",
+ __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
+ qp_init->cap.max_send_wr, ch);
+
+ if (!sdev->use_srq)
+ for (i = 0; i < ch->rq_size; i++)
+ srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]);
+
+out:
+ kfree(qp_init);
+ return ret;
+
+err_destroy_cq:
+ ch->qp = NULL;
+ ib_cq_pool_put(ch->cq, ch->cq_size);
+ goto out;
+}
+
+static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
+{
+ ib_destroy_qp(ch->qp);
+ ib_cq_pool_put(ch->cq, ch->cq_size);
+}
+
+/**
+ * srpt_close_ch - close a RDMA channel
+ * @ch: SRPT RDMA channel.
+ *
+ * Make sure all resources associated with the channel will be deallocated at
+ * an appropriate time.
+ *
+ * Returns true if and only if the channel state has been modified into
+ * CH_DRAINING.
+ */
+static bool srpt_close_ch(struct srpt_rdma_ch *ch)
+{
+ int ret;
+
+ if (!srpt_set_ch_state(ch, CH_DRAINING)) {
+ pr_debug("%s: already closed\n", ch->sess_name);
+ return false;
+ }
+
+ kref_get(&ch->kref);
+
+ ret = srpt_ch_qp_err(ch);
+ if (ret < 0)
+ pr_err("%s-%d: changing queue pair into error state failed: %d\n",
+ ch->sess_name, ch->qp->qp_num, ret);
+
+ ret = srpt_zerolength_write(ch);
+ if (ret < 0) {
+ pr_err("%s-%d: queuing zero-length write failed: %d\n",
+ ch->sess_name, ch->qp->qp_num, ret);
+ if (srpt_set_ch_state(ch, CH_DISCONNECTED))
+ schedule_work(&ch->release_work);
+ else
+ WARN_ON_ONCE(true);
+ }
+
+ kref_put(&ch->kref, srpt_free_ch);
+
+ return true;
+}
+
+/*
+ * Change the channel state into CH_DISCONNECTING. If a channel has not yet
+ * reached the connected state, close it. If a channel is in the connected
+ * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
+ * the responsibility of the caller to ensure that this function is not
+ * invoked concurrently with the code that accepts a connection. This means
+ * that this function must either be invoked from inside a CM callback
+ * function or that it must be invoked with the srpt_port.mutex held.
+ */
+static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
+{
+ int ret;
+
+ if (!srpt_set_ch_state(ch, CH_DISCONNECTING))
+ return -ENOTCONN;
+
+ if (ch->using_rdma_cm) {
+ ret = rdma_disconnect(ch->rdma_cm.cm_id);
+ } else {
+ ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0);
+ if (ret < 0)
+ ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0);
+ }
+
+ if (ret < 0 && srpt_close_ch(ch))
+ ret = 0;
+
+ return ret;
+}
+
+/* Send DREQ and wait for DREP. */
+static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)
+{
+ DECLARE_COMPLETION_ONSTACK(closed);
+ struct srpt_port *sport = ch->sport;
+
+ pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
+ ch->state);
+
+ ch->closed = &closed;
+
+ mutex_lock(&sport->mutex);
+ srpt_disconnect_ch(ch);
+ mutex_unlock(&sport->mutex);
+
+ while (wait_for_completion_timeout(&closed, 5 * HZ) == 0)
+ pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
+ ch->sess_name, ch->qp->qp_num, ch->state);
+
+}
+
+static void __srpt_close_all_ch(struct srpt_port *sport)
+{
+ struct srpt_nexus *nexus;
+ struct srpt_rdma_ch *ch;
+
+ lockdep_assert_held(&sport->mutex);
+
+ list_for_each_entry(nexus, &sport->nexus_list, entry) {
+ list_for_each_entry(ch, &nexus->ch_list, list) {
+ if (srpt_disconnect_ch(ch) >= 0)
+ pr_info("Closing channel %s-%d because target %s_%d has been disabled\n",
+ ch->sess_name, ch->qp->qp_num,
+ dev_name(&sport->sdev->device->dev),
+ sport->port);
+ srpt_close_ch(ch);
+ }
+ }
+}
+
+/*
+ * Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if
+ * it does not yet exist.
+ */
+static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport,
+ const u8 i_port_id[16],
+ const u8 t_port_id[16])
+{
+ struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n;
+
+ for (;;) {
+ mutex_lock(&sport->mutex);
+ list_for_each_entry(n, &sport->nexus_list, entry) {
+ if (memcmp(n->i_port_id, i_port_id, 16) == 0 &&
+ memcmp(n->t_port_id, t_port_id, 16) == 0) {
+ nexus = n;
+ break;
+ }
+ }
+ if (!nexus && tmp_nexus) {
+ list_add_tail_rcu(&tmp_nexus->entry,
+ &sport->nexus_list);
+ swap(nexus, tmp_nexus);
+ }
+ mutex_unlock(&sport->mutex);
+
+ if (nexus)
+ break;
+ tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
+ if (!tmp_nexus) {
+ nexus = ERR_PTR(-ENOMEM);
+ break;
+ }
+ INIT_LIST_HEAD(&tmp_nexus->ch_list);
+ memcpy(tmp_nexus->i_port_id, i_port_id, 16);
+ memcpy(tmp_nexus->t_port_id, t_port_id, 16);
+ }
+
+ kfree(tmp_nexus);
+
+ return nexus;
+}
+
+static void srpt_set_enabled(struct srpt_port *sport, bool enabled)
+ __must_hold(&sport->mutex)
+{
+ lockdep_assert_held(&sport->mutex);
+
+ if (sport->enabled == enabled)
+ return;
+ sport->enabled = enabled;
+ if (!enabled)
+ __srpt_close_all_ch(sport);
+}
+
+static void srpt_drop_sport_ref(struct srpt_port *sport)
+{
+ if (atomic_dec_return(&sport->refcount) == 0 && sport->freed_channels)
+ complete(sport->freed_channels);
+}
+
+static void srpt_free_ch(struct kref *kref)
+{
+ struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);
+
+ srpt_drop_sport_ref(ch->sport);
+ kfree_rcu(ch, rcu);
+}
+
+/*
+ * Shut down the SCSI target session, tell the connection manager to
+ * disconnect the associated RDMA channel, transition the QP to the error
+ * state and remove the channel from the channel list. This function is
+ * typically called from inside srpt_zerolength_write_done(). Concurrent
+ * srpt_zerolength_write() calls from inside srpt_close_ch() are possible
+ * as long as the channel is on sport->nexus_list.
+ */
+static void srpt_release_channel_work(struct work_struct *w)
+{
+ struct srpt_rdma_ch *ch;
+ struct srpt_device *sdev;
+ struct srpt_port *sport;
+ struct se_session *se_sess;
+
+ ch = container_of(w, struct srpt_rdma_ch, release_work);
+ pr_debug("%s-%d\n", ch->sess_name, ch->qp->qp_num);
+
+ sdev = ch->sport->sdev;
+ BUG_ON(!sdev);
+
+ se_sess = ch->sess;
+ BUG_ON(!se_sess);
+
+ target_stop_session(se_sess);
+ target_wait_for_sess_cmds(se_sess);
+
+ target_remove_session(se_sess);
+ ch->sess = NULL;
+
+ if (ch->using_rdma_cm)
+ rdma_destroy_id(ch->rdma_cm.cm_id);
+ else
+ ib_destroy_cm_id(ch->ib_cm.cm_id);
+
+ sport = ch->sport;
+ mutex_lock(&sport->mutex);
+ list_del_rcu(&ch->list);
+ mutex_unlock(&sport->mutex);
+
+ if (ch->closed)
+ complete(ch->closed);
+
+ srpt_destroy_ch_ib(ch);
+
+ srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
+ ch->sport->sdev, ch->rq_size,
+ ch->rsp_buf_cache, DMA_TO_DEVICE);
+
+ kmem_cache_destroy(ch->rsp_buf_cache);
+
+ srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
+ sdev, ch->rq_size,
+ ch->req_buf_cache, DMA_FROM_DEVICE);
+
+ kmem_cache_destroy(ch->req_buf_cache);
+
+ kref_put(&ch->kref, srpt_free_ch);
+}
+
+/**
+ * srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED
+ * @sdev: HCA through which the login request was received.
+ * @ib_cm_id: IB/CM connection identifier in case of IB/CM.
+ * @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM.
+ * @port_num: Port through which the REQ message was received.
+ * @pkey: P_Key of the incoming connection.
+ * @req: SRP login request.
+ * @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted
+ * the login request.
+ *
+ * Ownership of the cm_id is transferred to the target session if this
+ * function returns zero. Otherwise the caller remains the owner of cm_id.
+ */
+static int srpt_cm_req_recv(struct srpt_device *const sdev,
+ struct ib_cm_id *ib_cm_id,
+ struct rdma_cm_id *rdma_cm_id,
+ u8 port_num, __be16 pkey,
+ const struct srp_login_req *req,
+ const char *src_addr)
+{
+ struct srpt_port *sport = &sdev->port[port_num - 1];
+ struct srpt_nexus *nexus;
+ struct srp_login_rsp *rsp = NULL;
+ struct srp_login_rej *rej = NULL;
+ union {
+ struct rdma_conn_param rdma_cm;
+ struct ib_cm_rep_param ib_cm;
+ } *rep_param = NULL;
+ struct srpt_rdma_ch *ch = NULL;
+ char i_port_id[36];
+ u32 it_iu_len;
+ int i, tag_num, tag_size, ret;
+ struct srpt_tpg *stpg;
+
+ WARN_ON_ONCE(irqs_disabled());
+
+ it_iu_len = be32_to_cpu(req->req_it_iu_len);
+
+ pr_info("Received SRP_LOGIN_REQ with i_port_id %pI6, t_port_id %pI6 and it_iu_len %d on port %d (guid=%pI6); pkey %#04x\n",
+ req->initiator_port_id, req->target_port_id, it_iu_len,
+ port_num, &sport->gid, be16_to_cpu(pkey));
+
+ nexus = srpt_get_nexus(sport, req->initiator_port_id,
+ req->target_port_id);
+ if (IS_ERR(nexus)) {
+ ret = PTR_ERR(nexus);
+ goto out;
+ }
+
+ ret = -ENOMEM;
+ rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
+ rej = kzalloc(sizeof(*rej), GFP_KERNEL);
+ rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);
+ if (!rsp || !rej || !rep_param)
+ goto out;
+
+ ret = -EINVAL;
+ if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
+ rej->reason = cpu_to_be32(
+ SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
+ pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n",
+ it_iu_len, 64, srp_max_req_size);
+ goto reject;
+ }
+
+ if (!sport->enabled) {
+ rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+ pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n",
+ dev_name(&sport->sdev->device->dev), port_num);
+ goto reject;
+ }
+
+ if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
+ || *(__be64 *)(req->target_port_id + 8) !=
+ cpu_to_be64(srpt_service_guid)) {
+ rej->reason = cpu_to_be32(
+ SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
+ pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n");
+ goto reject;
+ }
+
+ ret = -ENOMEM;
+ ch = kzalloc(sizeof(*ch), GFP_KERNEL);
+ if (!ch) {
+ rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+ pr_err("rejected SRP_LOGIN_REQ because out of memory.\n");
+ goto reject;
+ }
+
+ kref_init(&ch->kref);
+ ch->pkey = be16_to_cpu(pkey);
+ ch->nexus = nexus;
+ ch->zw_cqe.done = srpt_zerolength_write_done;
+ INIT_WORK(&ch->release_work, srpt_release_channel_work);
+ ch->sport = sport;
+ if (rdma_cm_id) {
+ ch->using_rdma_cm = true;
+ ch->rdma_cm.cm_id = rdma_cm_id;
+ rdma_cm_id->context = ch;
+ } else {
+ ch->ib_cm.cm_id = ib_cm_id;
+ ib_cm_id->context = ch;
+ }
+ /*
+ * ch->rq_size should be at least as large as the initiator queue
+ * depth to avoid that the initiator driver has to report QUEUE_FULL
+ * to the SCSI mid-layer.
+ */
+ ch->rq_size = min(MAX_SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr);
+ spin_lock_init(&ch->spinlock);
+ ch->state = CH_CONNECTING;
+ INIT_LIST_HEAD(&ch->cmd_wait_list);
+ ch->max_rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
+
+ ch->rsp_buf_cache = kmem_cache_create("srpt-rsp-buf", ch->max_rsp_size,
+ 512, 0, NULL);
+ if (!ch->rsp_buf_cache)
+ goto free_ch;
+
+ ch->ioctx_ring = (struct srpt_send_ioctx **)
+ srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
+ sizeof(*ch->ioctx_ring[0]),
+ ch->rsp_buf_cache, 0, DMA_TO_DEVICE);
+ if (!ch->ioctx_ring) {
+ pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n");
+ rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+ goto free_rsp_cache;
+ }
+
+ for (i = 0; i < ch->rq_size; i++)
+ ch->ioctx_ring[i]->ch = ch;
+ if (!sdev->use_srq) {
+ u16 imm_data_offset = req->req_flags & SRP_IMMED_REQUESTED ?
+ be16_to_cpu(req->imm_data_offset) : 0;
+ u16 alignment_offset;
+ u32 req_sz;
+
+ if (req->req_flags & SRP_IMMED_REQUESTED)
+ pr_debug("imm_data_offset = %d\n",
+ be16_to_cpu(req->imm_data_offset));
+ if (imm_data_offset >= sizeof(struct srp_cmd)) {
+ ch->imm_data_offset = imm_data_offset;
+ rsp->rsp_flags |= SRP_LOGIN_RSP_IMMED_SUPP;
+ } else {
+ ch->imm_data_offset = 0;
+ }
+ alignment_offset = round_up(imm_data_offset, 512) -
+ imm_data_offset;
+ req_sz = alignment_offset + imm_data_offset + srp_max_req_size;
+ ch->req_buf_cache = kmem_cache_create("srpt-req-buf", req_sz,
+ 512, 0, NULL);
+ if (!ch->req_buf_cache)
+ goto free_rsp_ring;
+
+ ch->ioctx_recv_ring = (struct srpt_recv_ioctx **)
+ srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
+ sizeof(*ch->ioctx_recv_ring[0]),
+ ch->req_buf_cache,
+ alignment_offset,
+ DMA_FROM_DEVICE);
+ if (!ch->ioctx_recv_ring) {
+ pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n");
+ rej->reason =
+ cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+ goto free_recv_cache;
+ }
+ for (i = 0; i < ch->rq_size; i++)
+ INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list);
+ }
+
+ ret = srpt_create_ch_ib(ch);
+ if (ret) {
+ rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+ pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n");
+ goto free_recv_ring;
+ }
+
+ strscpy(ch->sess_name, src_addr, sizeof(ch->sess_name));
+ snprintf(i_port_id, sizeof(i_port_id), "0x%016llx%016llx",
+ be64_to_cpu(*(__be64 *)nexus->i_port_id),
+ be64_to_cpu(*(__be64 *)(nexus->i_port_id + 8)));
+
+ pr_debug("registering src addr %s or i_port_id %s\n", ch->sess_name,
+ i_port_id);
+
+ tag_num = ch->rq_size;
+ tag_size = 1; /* ib_srpt does not use se_sess->sess_cmd_map */
+
+ if (sport->guid_id) {
+ mutex_lock(&sport->guid_id->mutex);
+ list_for_each_entry(stpg, &sport->guid_id->tpg_list, entry) {
+ if (!IS_ERR_OR_NULL(ch->sess))
+ break;
+ ch->sess = target_setup_session(&stpg->tpg, tag_num,
+ tag_size, TARGET_PROT_NORMAL,
+ ch->sess_name, ch, NULL);
+ }
+ mutex_unlock(&sport->guid_id->mutex);
+ }
+
+ if (sport->gid_id) {
+ mutex_lock(&sport->gid_id->mutex);
+ list_for_each_entry(stpg, &sport->gid_id->tpg_list, entry) {
+ if (!IS_ERR_OR_NULL(ch->sess))
+ break;
+ ch->sess = target_setup_session(&stpg->tpg, tag_num,
+ tag_size, TARGET_PROT_NORMAL, i_port_id,
+ ch, NULL);
+ if (!IS_ERR_OR_NULL(ch->sess))
+ break;
+ /* Retry without leading "0x" */
+ ch->sess = target_setup_session(&stpg->tpg, tag_num,
+ tag_size, TARGET_PROT_NORMAL,
+ i_port_id + 2, ch, NULL);
+ }
+ mutex_unlock(&sport->gid_id->mutex);
+ }
+
+ if (IS_ERR_OR_NULL(ch->sess)) {
+ WARN_ON_ONCE(ch->sess == NULL);
+ ret = PTR_ERR(ch->sess);
+ ch->sess = NULL;
+ pr_info("Rejected login for initiator %s: ret = %d.\n",
+ ch->sess_name, ret);
+ rej->reason = cpu_to_be32(ret == -ENOMEM ?
+ SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES :
+ SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
+ goto destroy_ib;
+ }
+
+ /*
+ * Once a session has been created destruction of srpt_rdma_ch objects
+ * will decrement sport->refcount. Hence increment sport->refcount now.
+ */
+ atomic_inc(&sport->refcount);
+
+ mutex_lock(&sport->mutex);
+
+ if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
+ struct srpt_rdma_ch *ch2;
+
+ list_for_each_entry(ch2, &nexus->ch_list, list) {
+ if (srpt_disconnect_ch(ch2) < 0)
+ continue;
+ pr_info("Relogin - closed existing channel %s\n",
+ ch2->sess_name);
+ rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
+ }
+ } else {
+ rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
+ }
+
+ list_add_tail_rcu(&ch->list, &nexus->ch_list);
+
+ if (!sport->enabled) {
+ rej->reason = cpu_to_be32(
+ SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+ pr_info("rejected SRP_LOGIN_REQ because target %s_%d is not enabled\n",
+ dev_name(&sdev->device->dev), port_num);
+ mutex_unlock(&sport->mutex);
+ ret = -EINVAL;
+ goto reject;
+ }
+
+ mutex_unlock(&sport->mutex);
+
+ ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rtr(ch, ch->qp);
+ if (ret) {
+ rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+ pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n",
+ ret);
+ goto reject;
+ }
+
+ pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch->sess,
+ ch->sess_name, ch);
+
+ /* create srp_login_response */
+ rsp->opcode = SRP_LOGIN_RSP;
+ rsp->tag = req->tag;
+ rsp->max_it_iu_len = cpu_to_be32(srp_max_req_size);
+ rsp->max_ti_iu_len = req->req_it_iu_len;
+ ch->max_ti_iu_len = it_iu_len;
+ rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
+ SRP_BUF_FORMAT_INDIRECT);
+ rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
+ atomic_set(&ch->req_lim, ch->rq_size);
+ atomic_set(&ch->req_lim_delta, 0);
+
+ /* create cm reply */
+ if (ch->using_rdma_cm) {
+ rep_param->rdma_cm.private_data = (void *)rsp;
+ rep_param->rdma_cm.private_data_len = sizeof(*rsp);
+ rep_param->rdma_cm.rnr_retry_count = 7;
+ rep_param->rdma_cm.flow_control = 1;
+ rep_param->rdma_cm.responder_resources = 4;
+ rep_param->rdma_cm.initiator_depth = 4;
+ } else {
+ rep_param->ib_cm.qp_num = ch->qp->qp_num;
+ rep_param->ib_cm.private_data = (void *)rsp;
+ rep_param->ib_cm.private_data_len = sizeof(*rsp);
+ rep_param->ib_cm.rnr_retry_count = 7;
+ rep_param->ib_cm.flow_control = 1;
+ rep_param->ib_cm.failover_accepted = 0;
+ rep_param->ib_cm.srq = 1;
+ rep_param->ib_cm.responder_resources = 4;
+ rep_param->ib_cm.initiator_depth = 4;
+ }
+
+ /*
+ * Hold the sport mutex while accepting a connection to avoid that
+ * srpt_disconnect_ch() is invoked concurrently with this code.
+ */
+ mutex_lock(&sport->mutex);
+ if (sport->enabled && ch->state == CH_CONNECTING) {
+ if (ch->using_rdma_cm)
+ ret = rdma_accept(rdma_cm_id, &rep_param->rdma_cm);
+ else
+ ret = ib_send_cm_rep(ib_cm_id, &rep_param->ib_cm);
+ } else {
+ ret = -EINVAL;
+ }
+ mutex_unlock(&sport->mutex);
+
+ switch (ret) {
+ case 0:
+ break;
+ case -EINVAL:
+ goto reject;
+ default:
+ rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+ pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n",
+ ret);
+ goto reject;
+ }
+
+ goto out;
+
+destroy_ib:
+ srpt_destroy_ch_ib(ch);
+
+free_recv_ring:
+ srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
+ ch->sport->sdev, ch->rq_size,
+ ch->req_buf_cache, DMA_FROM_DEVICE);
+
+free_recv_cache:
+ kmem_cache_destroy(ch->req_buf_cache);
+
+free_rsp_ring:
+ srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
+ ch->sport->sdev, ch->rq_size,
+ ch->rsp_buf_cache, DMA_TO_DEVICE);
+
+free_rsp_cache:
+ kmem_cache_destroy(ch->rsp_buf_cache);
+
+free_ch:
+ if (rdma_cm_id)
+ rdma_cm_id->context = NULL;
+ else
+ ib_cm_id->context = NULL;
+ kfree(ch);
+ ch = NULL;
+
+ WARN_ON_ONCE(ret == 0);
+
+reject:
+ pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason));
+ rej->opcode = SRP_LOGIN_REJ;
+ rej->tag = req->tag;
+ rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
+ SRP_BUF_FORMAT_INDIRECT);
+
+ if (rdma_cm_id)
+ rdma_reject(rdma_cm_id, rej, sizeof(*rej),
+ IB_CM_REJ_CONSUMER_DEFINED);
+ else
+ ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
+ rej, sizeof(*rej));
+
+ if (ch && ch->sess) {
+ srpt_close_ch(ch);
+ /*
+ * Tell the caller not to free cm_id since
+ * srpt_release_channel_work() will do that.
+ */
+ ret = 0;
+ }
+
+out:
+ kfree(rep_param);
+ kfree(rsp);
+ kfree(rej);
+
+ return ret;
+}
+
+static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id,
+ const struct ib_cm_req_event_param *param,
+ void *private_data)
+{
+ char sguid[40];
+
+ srpt_format_guid(sguid, sizeof(sguid),
+ &param->primary_path->dgid.global.interface_id);
+
+ return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port,
+ param->primary_path->pkey,
+ private_data, sguid);
+}
+
+static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ struct srpt_device *sdev;
+ struct srp_login_req req;
+ const struct srp_login_req_rdma *req_rdma;
+ struct sa_path_rec *path_rec = cm_id->route.path_rec;
+ char src_addr[40];
+
+ sdev = ib_get_client_data(cm_id->device, &srpt_client);
+ if (!sdev)
+ return -ECONNREFUSED;
+
+ if (event->param.conn.private_data_len < sizeof(*req_rdma))
+ return -EINVAL;
+
+ /* Transform srp_login_req_rdma into srp_login_req. */
+ req_rdma = event->param.conn.private_data;
+ memset(&req, 0, sizeof(req));
+ req.opcode = req_rdma->opcode;
+ req.tag = req_rdma->tag;
+ req.req_it_iu_len = req_rdma->req_it_iu_len;
+ req.req_buf_fmt = req_rdma->req_buf_fmt;
+ req.req_flags = req_rdma->req_flags;
+ memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16);
+ memcpy(req.target_port_id, req_rdma->target_port_id, 16);
+ req.imm_data_offset = req_rdma->imm_data_offset;
+
+ snprintf(src_addr, sizeof(src_addr), "%pIS",
+ &cm_id->route.addr.src_addr);
+
+ return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num,
+ path_rec ? path_rec->pkey : 0, &req, src_addr);
+}
+
+static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,
+ enum ib_cm_rej_reason reason,
+ const u8 *private_data,
+ u8 private_data_len)
+{
+ char *priv = NULL;
+ int i;
+
+ if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,
+ GFP_KERNEL))) {
+ for (i = 0; i < private_data_len; i++)
+ sprintf(priv + 3 * i, " %02x", private_data[i]);
+ }
+ pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
+ ch->sess_name, ch->qp->qp_num, reason, private_data_len ?
+ "; private data" : "", priv ? priv : " (?)");
+ kfree(priv);
+}
+
+/**
+ * srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event
+ * @ch: SRPT RDMA channel.
+ *
+ * An RTU (ready to use) message indicates that the connection has been
+ * established and that the recipient may begin transmitting.
+ */
+static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
+{
+ int ret;
+
+ ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp);
+ if (ret < 0) {
+ pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name,
+ ch->qp->qp_num);
+ srpt_close_ch(ch);
+ return;
+ }
+
+ /*
+ * Note: calling srpt_close_ch() if the transition to the LIVE state
+ * fails is not necessary since that means that that function has
+ * already been invoked from another thread.
+ */
+ if (!srpt_set_ch_state(ch, CH_LIVE)) {
+ pr_err("%s-%d: channel transition to LIVE state failed\n",
+ ch->sess_name, ch->qp->qp_num);
+ return;
+ }
+
+ /* Trigger wait list processing. */
+ ret = srpt_zerolength_write(ch);
+ WARN_ONCE(ret < 0, "%d\n", ret);
+}
+
+/**
+ * srpt_cm_handler - IB connection manager callback function
+ * @cm_id: IB/CM connection identifier.
+ * @event: IB/CM event.
+ *
+ * A non-zero return value will cause the caller destroy the CM ID.
+ *
+ * Note: srpt_cm_handler() must only return a non-zero value when transferring
+ * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
+ * a non-zero value in any other case will trigger a race with the
+ * ib_destroy_cm_id() call in srpt_release_channel().
+ */
+static int srpt_cm_handler(struct ib_cm_id *cm_id,
+ const struct ib_cm_event *event)
+{
+ struct srpt_rdma_ch *ch = cm_id->context;
+ int ret;
+
+ ret = 0;
+ switch (event->event) {
+ case IB_CM_REQ_RECEIVED:
+ ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd,
+ event->private_data);
+ break;
+ case IB_CM_REJ_RECEIVED:
+ srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,
+ event->private_data,
+ IB_CM_REJ_PRIVATE_DATA_SIZE);
+ break;
+ case IB_CM_RTU_RECEIVED:
+ case IB_CM_USER_ESTABLISHED:
+ srpt_cm_rtu_recv(ch);
+ break;
+ case IB_CM_DREQ_RECEIVED:
+ srpt_disconnect_ch(ch);
+ break;
+ case IB_CM_DREP_RECEIVED:
+ pr_info("Received CM DREP message for ch %s-%d.\n",
+ ch->sess_name, ch->qp->qp_num);
+ srpt_close_ch(ch);
+ break;
+ case IB_CM_TIMEWAIT_EXIT:
+ pr_info("Received CM TimeWait exit for ch %s-%d.\n",
+ ch->sess_name, ch->qp->qp_num);
+ srpt_close_ch(ch);
+ break;
+ case IB_CM_REP_ERROR:
+ pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
+ ch->qp->qp_num);
+ break;
+ case IB_CM_DREQ_ERROR:
+ pr_info("Received CM DREQ ERROR event.\n");
+ break;
+ case IB_CM_MRA_RECEIVED:
+ pr_info("Received CM MRA event\n");
+ break;
+ default:
+ pr_err("received unrecognized CM event %d\n", event->event);
+ break;
+ }
+
+ return ret;
+}
+
+static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ struct srpt_rdma_ch *ch = cm_id->context;
+ int ret = 0;
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ ret = srpt_rdma_cm_req_recv(cm_id, event);
+ break;
+ case RDMA_CM_EVENT_REJECTED:
+ srpt_cm_rej_recv(ch, event->status,
+ event->param.conn.private_data,
+ event->param.conn.private_data_len);
+ break;
+ case RDMA_CM_EVENT_ESTABLISHED:
+ srpt_cm_rtu_recv(ch);
+ break;
+ case RDMA_CM_EVENT_DISCONNECTED:
+ if (ch->state < CH_DISCONNECTING)
+ srpt_disconnect_ch(ch);
+ else
+ srpt_close_ch(ch);
+ break;
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ srpt_close_ch(ch);
+ break;
+ case RDMA_CM_EVENT_UNREACHABLE:
+ pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
+ ch->qp->qp_num);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ break;
+ default:
+ pr_err("received unrecognized RDMA CM event %d\n",
+ event->event);
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * srpt_write_pending - Start data transfer from initiator to target (write).
+ */
+static int srpt_write_pending(struct se_cmd *se_cmd)
+{
+ struct srpt_send_ioctx *ioctx =
+ container_of(se_cmd, struct srpt_send_ioctx, cmd);
+ struct srpt_rdma_ch *ch = ioctx->ch;
+ struct ib_send_wr *first_wr = NULL;
+ struct ib_cqe *cqe = &ioctx->rdma_cqe;
+ enum srpt_command_state new_state;
+ int ret, i;
+
+ if (ioctx->recv_ioctx) {
+ srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
+ target_execute_cmd(&ioctx->cmd);
+ return 0;
+ }
+
+ new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
+ WARN_ON(new_state == SRPT_STATE_DONE);
+
+ if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) {
+ pr_warn("%s: IB send queue full (needed %d)\n",
+ __func__, ioctx->n_rdma);
+ ret = -ENOMEM;
+ goto out_undo;
+ }
+
+ cqe->done = srpt_rdma_read_done;
+ for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
+ struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
+
+ first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port,
+ cqe, first_wr);
+ cqe = NULL;
+ }
+
+ ret = ib_post_send(ch->qp, first_wr, NULL);
+ if (ret) {
+ pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
+ __func__, ret, ioctx->n_rdma,
+ atomic_read(&ch->sq_wr_avail));
+ goto out_undo;
+ }
+
+ return 0;
+out_undo:
+ atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
+ return ret;
+}
+
+static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
+{
+ switch (tcm_mgmt_status) {
+ case TMR_FUNCTION_COMPLETE:
+ return SRP_TSK_MGMT_SUCCESS;
+ case TMR_FUNCTION_REJECTED:
+ return SRP_TSK_MGMT_FUNC_NOT_SUPP;
+ }
+ return SRP_TSK_MGMT_FAILED;
+}
+
+/**
+ * srpt_queue_response - transmit the response to a SCSI command
+ * @cmd: SCSI target command.
+ *
+ * Callback function called by the TCM core. Must not block since it can be
+ * invoked on the context of the IB completion handler.
+ */
+static void srpt_queue_response(struct se_cmd *cmd)
+{
+ struct srpt_send_ioctx *ioctx =
+ container_of(cmd, struct srpt_send_ioctx, cmd);
+ struct srpt_rdma_ch *ch = ioctx->ch;
+ struct srpt_device *sdev = ch->sport->sdev;
+ struct ib_send_wr send_wr, *first_wr = &send_wr;
+ struct ib_sge sge;
+ enum srpt_command_state state;
+ int resp_len, ret, i;
+ u8 srp_tm_status;
+
+ state = ioctx->state;
+ switch (state) {
+ case SRPT_STATE_NEW:
+ case SRPT_STATE_DATA_IN:
+ ioctx->state = SRPT_STATE_CMD_RSP_SENT;
+ break;
+ case SRPT_STATE_MGMT:
+ ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
+ break;
+ default:
+ WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
+ ch, ioctx->ioctx.index, ioctx->state);
+ break;
+ }
+
+ if (WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))
+ return;
+
+ /* For read commands, transfer the data to the initiator. */
+ if (ioctx->cmd.data_direction == DMA_FROM_DEVICE &&
+ ioctx->cmd.data_length &&
+ !ioctx->queue_status_only) {
+ for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
+ struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
+
+ first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,
+ ch->sport->port, NULL, first_wr);
+ }
+ }
+
+ if (state != SRPT_STATE_MGMT)
+ resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
+ cmd->scsi_status);
+ else {
+ srp_tm_status
+ = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
+ resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
+ ioctx->cmd.tag);
+ }
+
+ atomic_inc(&ch->req_lim);
+
+ if (unlikely(atomic_sub_return(1 + ioctx->n_rdma,
+ &ch->sq_wr_avail) < 0)) {
+ pr_warn("%s: IB send queue full (needed %d)\n",
+ __func__, ioctx->n_rdma);
+ goto out;
+ }
+
+ ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len,
+ DMA_TO_DEVICE);
+
+ sge.addr = ioctx->ioctx.dma;
+ sge.length = resp_len;
+ sge.lkey = sdev->lkey;
+
+ ioctx->ioctx.cqe.done = srpt_send_done;
+ send_wr.next = NULL;
+ send_wr.wr_cqe = &ioctx->ioctx.cqe;
+ send_wr.sg_list = &sge;
+ send_wr.num_sge = 1;
+ send_wr.opcode = IB_WR_SEND;
+ send_wr.send_flags = IB_SEND_SIGNALED;
+
+ ret = ib_post_send(ch->qp, first_wr, NULL);
+ if (ret < 0) {
+ pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
+ __func__, ioctx->cmd.tag, ret);
+ goto out;
+ }
+
+ return;
+
+out:
+ atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
+ atomic_dec(&ch->req_lim);
+ srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
+ target_put_sess_cmd(&ioctx->cmd);
+}
+
+static int srpt_queue_data_in(struct se_cmd *cmd)
+{
+ srpt_queue_response(cmd);
+ return 0;
+}
+
+static void srpt_queue_tm_rsp(struct se_cmd *cmd)
+{
+ srpt_queue_response(cmd);
+}
+
+/*
+ * This function is called for aborted commands if no response is sent to the
+ * initiator. Make sure that the credits freed by aborting a command are
+ * returned to the initiator the next time a response is sent by incrementing
+ * ch->req_lim_delta.
+ */
+static void srpt_aborted_task(struct se_cmd *cmd)
+{
+ struct srpt_send_ioctx *ioctx = container_of(cmd,
+ struct srpt_send_ioctx, cmd);
+ struct srpt_rdma_ch *ch = ioctx->ch;
+
+ atomic_inc(&ch->req_lim_delta);
+}
+
+static int srpt_queue_status(struct se_cmd *cmd)
+{
+ struct srpt_send_ioctx *ioctx;
+
+ ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
+ BUG_ON(ioctx->sense_data != cmd->sense_buffer);
+ if (cmd->se_cmd_flags &
+ (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
+ WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
+ ioctx->queue_status_only = true;
+ srpt_queue_response(cmd);
+ return 0;
+}
+
+static void srpt_refresh_port_work(struct work_struct *work)
+{
+ struct srpt_port *sport = container_of(work, struct srpt_port, work);
+
+ srpt_refresh_port(sport);
+}
+
+/**
+ * srpt_release_sport - disable login and wait for associated channels
+ * @sport: SRPT HCA port.
+ */
+static int srpt_release_sport(struct srpt_port *sport)
+{
+ DECLARE_COMPLETION_ONSTACK(c);
+ struct srpt_nexus *nexus, *next_n;
+ struct srpt_rdma_ch *ch;
+
+ WARN_ON_ONCE(irqs_disabled());
+
+ sport->freed_channels = &c;
+
+ mutex_lock(&sport->mutex);
+ srpt_set_enabled(sport, false);
+ mutex_unlock(&sport->mutex);
+
+ while (atomic_read(&sport->refcount) > 0 &&
+ wait_for_completion_timeout(&c, 5 * HZ) <= 0) {
+ pr_info("%s_%d: waiting for unregistration of %d sessions ...\n",
+ dev_name(&sport->sdev->device->dev), sport->port,
+ atomic_read(&sport->refcount));
+ rcu_read_lock();
+ list_for_each_entry(nexus, &sport->nexus_list, entry) {
+ list_for_each_entry(ch, &nexus->ch_list, list) {
+ pr_info("%s-%d: state %s\n",
+ ch->sess_name, ch->qp->qp_num,
+ get_ch_state_name(ch->state));
+ }
+ }
+ rcu_read_unlock();
+ }
+
+ mutex_lock(&sport->mutex);
+ list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) {
+ list_del(&nexus->entry);
+ kfree_rcu(nexus, rcu);
+ }
+ mutex_unlock(&sport->mutex);
+
+ return 0;
+}
+
+struct port_and_port_id {
+ struct srpt_port *sport;
+ struct srpt_port_id **port_id;
+};
+
+static struct port_and_port_id __srpt_lookup_port(const char *name)
+{
+ struct ib_device *dev;
+ struct srpt_device *sdev;
+ struct srpt_port *sport;
+ int i;
+
+ list_for_each_entry(sdev, &srpt_dev_list, list) {
+ dev = sdev->device;
+ if (!dev)
+ continue;
+
+ for (i = 0; i < dev->phys_port_cnt; i++) {
+ sport = &sdev->port[i];
+
+ if (strcmp(sport->guid_name, name) == 0) {
+ kref_get(&sdev->refcnt);
+ return (struct port_and_port_id){
+ sport, &sport->guid_id};
+ }
+ if (strcmp(sport->gid_name, name) == 0) {
+ kref_get(&sdev->refcnt);
+ return (struct port_and_port_id){
+ sport, &sport->gid_id};
+ }
+ }
+ }
+
+ return (struct port_and_port_id){};
+}
+
+/**
+ * srpt_lookup_port() - Look up an RDMA port by name
+ * @name: ASCII port name
+ *
+ * Increments the RDMA port reference count if an RDMA port pointer is returned.
+ * The caller must drop that reference count by calling srpt_port_put_ref().
+ */
+static struct port_and_port_id srpt_lookup_port(const char *name)
+{
+ struct port_and_port_id papi;
+
+ spin_lock(&srpt_dev_lock);
+ papi = __srpt_lookup_port(name);
+ spin_unlock(&srpt_dev_lock);
+
+ return papi;
+}
+
+static void srpt_free_srq(struct srpt_device *sdev)
+{
+ if (!sdev->srq)
+ return;
+
+ ib_destroy_srq(sdev->srq);
+ srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
+ sdev->srq_size, sdev->req_buf_cache,
+ DMA_FROM_DEVICE);
+ kmem_cache_destroy(sdev->req_buf_cache);
+ sdev->srq = NULL;
+}
+
+static int srpt_alloc_srq(struct srpt_device *sdev)
+{
+ struct ib_srq_init_attr srq_attr = {
+ .event_handler = srpt_srq_event,
+ .srq_context = (void *)sdev,
+ .attr.max_wr = sdev->srq_size,
+ .attr.max_sge = 1,
+ .srq_type = IB_SRQT_BASIC,
+ };
+ struct ib_device *device = sdev->device;
+ struct ib_srq *srq;
+ int i;
+
+ WARN_ON_ONCE(sdev->srq);
+ srq = ib_create_srq(sdev->pd, &srq_attr);
+ if (IS_ERR(srq)) {
+ pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq));
+ return PTR_ERR(srq);
+ }
+
+ pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size,
+ sdev->device->attrs.max_srq_wr, dev_name(&device->dev));
+
+ sdev->req_buf_cache = kmem_cache_create("srpt-srq-req-buf",
+ srp_max_req_size, 0, 0, NULL);
+ if (!sdev->req_buf_cache)
+ goto free_srq;
+
+ sdev->ioctx_ring = (struct srpt_recv_ioctx **)
+ srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
+ sizeof(*sdev->ioctx_ring[0]),
+ sdev->req_buf_cache, 0, DMA_FROM_DEVICE);
+ if (!sdev->ioctx_ring)
+ goto free_cache;
+
+ sdev->use_srq = true;
+ sdev->srq = srq;
+
+ for (i = 0; i < sdev->srq_size; ++i) {
+ INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list);
+ srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]);
+ }
+
+ return 0;
+
+free_cache:
+ kmem_cache_destroy(sdev->req_buf_cache);
+
+free_srq:
+ ib_destroy_srq(srq);
+ return -ENOMEM;
+}
+
+static int srpt_use_srq(struct srpt_device *sdev, bool use_srq)
+{
+ struct ib_device *device = sdev->device;
+ int ret = 0;
+
+ if (!use_srq) {
+ srpt_free_srq(sdev);
+ sdev->use_srq = false;
+ } else if (use_srq && !sdev->srq) {
+ ret = srpt_alloc_srq(sdev);
+ }
+ pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__,
+ dev_name(&device->dev), sdev->use_srq, ret);
+ return ret;
+}
+
+static void srpt_free_sdev(struct kref *refcnt)
+{
+ struct srpt_device *sdev = container_of(refcnt, typeof(*sdev), refcnt);
+
+ kfree(sdev);
+}
+
+static void srpt_sdev_put(struct srpt_device *sdev)
+{
+ kref_put(&sdev->refcnt, srpt_free_sdev);
+}
+
+/**
+ * srpt_add_one - InfiniBand device addition callback function
+ * @device: Describes a HCA.
+ */
+static int srpt_add_one(struct ib_device *device)
+{
+ struct srpt_device *sdev;
+ struct srpt_port *sport;
+ int ret;
+ u32 i;
+
+ pr_debug("device = %p\n", device);
+
+ sdev = kzalloc(struct_size(sdev, port, device->phys_port_cnt),
+ GFP_KERNEL);
+ if (!sdev)
+ return -ENOMEM;
+
+ kref_init(&sdev->refcnt);
+ sdev->device = device;
+ mutex_init(&sdev->sdev_mutex);
+
+ sdev->pd = ib_alloc_pd(device, 0);
+ if (IS_ERR(sdev->pd)) {
+ ret = PTR_ERR(sdev->pd);
+ goto free_dev;
+ }
+
+ sdev->lkey = sdev->pd->local_dma_lkey;
+
+ sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
+
+ srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq);
+
+ if (!srpt_service_guid)
+ srpt_service_guid = be64_to_cpu(device->node_guid);
+
+ if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND)
+ sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
+ if (IS_ERR(sdev->cm_id)) {
+ pr_info("ib_create_cm_id() failed: %ld\n",
+ PTR_ERR(sdev->cm_id));
+ ret = PTR_ERR(sdev->cm_id);
+ sdev->cm_id = NULL;
+ if (!rdma_cm_id)
+ goto err_ring;
+ }
+
+ /* print out target login information */
+ pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,pkey=ffff,service_id=%016llx\n",
+ srpt_service_guid, srpt_service_guid, srpt_service_guid);
+
+ /*
+ * We do not have a consistent service_id (ie. also id_ext of target_id)
+ * to identify this target. We currently use the guid of the first HCA
+ * in the system as service_id; therefore, the target_id will change
+ * if this HCA is gone bad and replaced by different HCA
+ */
+ ret = sdev->cm_id ?
+ ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid)) :
+ 0;
+ if (ret < 0) {
+ pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret,
+ sdev->cm_id->state);
+ goto err_cm;
+ }
+
+ INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
+ srpt_event_handler);
+ ib_register_event_handler(&sdev->event_handler);
+
+ for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
+ sport = &sdev->port[i - 1];
+ INIT_LIST_HEAD(&sport->nexus_list);
+ mutex_init(&sport->mutex);
+ sport->sdev = sdev;
+ sport->port = i;
+ sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
+ sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
+ sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
+ sport->port_attrib.use_srq = false;
+ INIT_WORK(&sport->work, srpt_refresh_port_work);
+
+ ret = srpt_refresh_port(sport);
+ if (ret) {
+ pr_err("MAD registration failed for %s-%d.\n",
+ dev_name(&sdev->device->dev), i);
+ i--;
+ goto err_port;
+ }
+ }
+
+ spin_lock(&srpt_dev_lock);
+ list_add_tail(&sdev->list, &srpt_dev_list);
+ spin_unlock(&srpt_dev_lock);
+
+ ib_set_client_data(device, &srpt_client, sdev);
+ pr_debug("added %s.\n", dev_name(&device->dev));
+ return 0;
+
+err_port:
+ srpt_unregister_mad_agent(sdev, i);
+ ib_unregister_event_handler(&sdev->event_handler);
+err_cm:
+ if (sdev->cm_id)
+ ib_destroy_cm_id(sdev->cm_id);
+err_ring:
+ srpt_free_srq(sdev);
+ ib_dealloc_pd(sdev->pd);
+free_dev:
+ srpt_sdev_put(sdev);
+ pr_info("%s(%s) failed.\n", __func__, dev_name(&device->dev));
+ return ret;
+}
+
+/**
+ * srpt_remove_one - InfiniBand device removal callback function
+ * @device: Describes a HCA.
+ * @client_data: The value passed as the third argument to ib_set_client_data().
+ */
+static void srpt_remove_one(struct ib_device *device, void *client_data)
+{
+ struct srpt_device *sdev = client_data;
+ int i;
+
+ srpt_unregister_mad_agent(sdev, sdev->device->phys_port_cnt);
+
+ ib_unregister_event_handler(&sdev->event_handler);
+
+ /* Cancel any work queued by the just unregistered IB event handler. */
+ for (i = 0; i < sdev->device->phys_port_cnt; i++)
+ cancel_work_sync(&sdev->port[i].work);
+
+ if (sdev->cm_id)
+ ib_destroy_cm_id(sdev->cm_id);
+
+ ib_set_client_data(device, &srpt_client, NULL);
+
+ /*
+ * Unregistering a target must happen after destroying sdev->cm_id
+ * such that no new SRP_LOGIN_REQ information units can arrive while
+ * destroying the target.
+ */
+ spin_lock(&srpt_dev_lock);
+ list_del(&sdev->list);
+ spin_unlock(&srpt_dev_lock);
+
+ for (i = 0; i < sdev->device->phys_port_cnt; i++)
+ srpt_release_sport(&sdev->port[i]);
+
+ srpt_free_srq(sdev);
+
+ ib_dealloc_pd(sdev->pd);
+
+ srpt_sdev_put(sdev);
+}
+
+static struct ib_client srpt_client = {
+ .name = DRV_NAME,
+ .add = srpt_add_one,
+ .remove = srpt_remove_one
+};
+
+static int srpt_check_true(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static int srpt_check_false(struct se_portal_group *se_tpg)
+{
+ return 0;
+}
+
+static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg)
+{
+ return tpg->se_tpg_wwn->priv;
+}
+
+static struct srpt_port_id *srpt_wwn_to_sport_id(struct se_wwn *wwn)
+{
+ struct srpt_port *sport = wwn->priv;
+
+ if (sport->guid_id && &sport->guid_id->wwn == wwn)
+ return sport->guid_id;
+ if (sport->gid_id && &sport->gid_id->wwn == wwn)
+ return sport->gid_id;
+ WARN_ON_ONCE(true);
+ return NULL;
+}
+
+static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
+{
+ struct srpt_tpg *stpg = container_of(tpg, typeof(*stpg), tpg);
+
+ return stpg->sport_id->name;
+}
+
+static u16 srpt_get_tag(struct se_portal_group *tpg)
+{
+ return 1;
+}
+
+static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static void srpt_release_cmd(struct se_cmd *se_cmd)
+{
+ struct srpt_send_ioctx *ioctx = container_of(se_cmd,
+ struct srpt_send_ioctx, cmd);
+ struct srpt_rdma_ch *ch = ioctx->ch;
+ struct srpt_recv_ioctx *recv_ioctx = ioctx->recv_ioctx;
+
+ WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE &&
+ !(ioctx->cmd.transport_state & CMD_T_ABORTED));
+
+ if (recv_ioctx) {
+ WARN_ON_ONCE(!list_empty(&recv_ioctx->wait_list));
+ ioctx->recv_ioctx = NULL;
+ srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);
+ }
+
+ if (ioctx->n_rw_ctx) {
+ srpt_free_rw_ctxs(ch, ioctx);
+ ioctx->n_rw_ctx = 0;
+ }
+
+ target_free_tag(se_cmd->se_sess, se_cmd);
+}
+
+/**
+ * srpt_close_session - forcibly close a session
+ * @se_sess: SCSI target session.
+ *
+ * Callback function invoked by the TCM core to clean up sessions associated
+ * with a node ACL when the user invokes
+ * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
+ */
+static void srpt_close_session(struct se_session *se_sess)
+{
+ struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
+
+ srpt_disconnect_ch_sync(ch);
+}
+
+/**
+ * srpt_sess_get_index - return the value of scsiAttIntrPortIndex (SCSI-MIB)
+ * @se_sess: SCSI target session.
+ *
+ * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
+ * This object represents an arbitrary integer used to uniquely identify a
+ * particular attached remote initiator port to a particular SCSI target port
+ * within a particular SCSI target device within a particular SCSI instance.
+ */
+static u32 srpt_sess_get_index(struct se_session *se_sess)
+{
+ return 0;
+}
+
+static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
+{
+}
+
+/* Note: only used from inside debug printk's by the TCM core. */
+static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
+{
+ struct srpt_send_ioctx *ioctx;
+
+ ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
+ return ioctx->state;
+}
+
+static int srpt_parse_guid(u64 *guid, const char *name)
+{
+ u16 w[4];
+ int ret = -EINVAL;
+
+ if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4)
+ goto out;
+ *guid = get_unaligned_be64(w);
+ ret = 0;
+out:
+ return ret;
+}
+
+/**
+ * srpt_parse_i_port_id - parse an initiator port ID
+ * @name: ASCII representation of a 128-bit initiator port ID.
+ * @i_port_id: Binary 128-bit port ID.
+ */
+static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
+{
+ const char *p;
+ unsigned len, count, leading_zero_bytes;
+ int ret;
+
+ p = name;
+ if (strncasecmp(p, "0x", 2) == 0)
+ p += 2;
+ ret = -EINVAL;
+ len = strlen(p);
+ if (len % 2)
+ goto out;
+ count = min(len / 2, 16U);
+ leading_zero_bytes = 16 - count;
+ memset(i_port_id, 0, leading_zero_bytes);
+ ret = hex2bin(i_port_id + leading_zero_bytes, p, count);
+
+out:
+ return ret;
+}
+
+/*
+ * configfs callback function invoked for mkdir
+ * /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
+ *
+ * i_port_id must be an initiator port GUID, GID or IP address. See also the
+ * target_alloc_session() calls in this driver. Examples of valid initiator
+ * port IDs:
+ * 0x0000000000000000505400fffe4a0b7b
+ * 0000000000000000505400fffe4a0b7b
+ * 5054:00ff:fe4a:0b7b
+ * 192.168.122.76
+ */
+static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
+{
+ struct sockaddr_storage sa;
+ u64 guid;
+ u8 i_port_id[16];
+ int ret;
+
+ ret = srpt_parse_guid(&guid, name);
+ if (ret < 0)
+ ret = srpt_parse_i_port_id(i_port_id, name);
+ if (ret < 0)
+ ret = inet_pton_with_scope(&init_net, AF_UNSPEC, name, NULL,
+ &sa);
+ if (ret < 0)
+ pr_err("invalid initiator port ID %s\n", name);
+ return ret;
+}
+
+static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,
+ char *page)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+
+ return sysfs_emit(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
+}
+
+static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+ unsigned long val;
+ int ret;
+
+ ret = kstrtoul(page, 0, &val);
+ if (ret < 0) {
+ pr_err("kstrtoul() failed with ret: %d\n", ret);
+ return -EINVAL;
+ }
+ if (val > MAX_SRPT_RDMA_SIZE) {
+ pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
+ MAX_SRPT_RDMA_SIZE);
+ return -EINVAL;
+ }
+ if (val < DEFAULT_MAX_RDMA_SIZE) {
+ pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
+ val, DEFAULT_MAX_RDMA_SIZE);
+ return -EINVAL;
+ }
+ sport->port_attrib.srp_max_rdma_size = val;
+
+ return count;
+}
+
+static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,
+ char *page)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+
+ return sysfs_emit(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
+}
+
+static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+ unsigned long val;
+ int ret;
+
+ ret = kstrtoul(page, 0, &val);
+ if (ret < 0) {
+ pr_err("kstrtoul() failed with ret: %d\n", ret);
+ return -EINVAL;
+ }
+ if (val > MAX_SRPT_RSP_SIZE) {
+ pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
+ MAX_SRPT_RSP_SIZE);
+ return -EINVAL;
+ }
+ if (val < MIN_MAX_RSP_SIZE) {
+ pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
+ MIN_MAX_RSP_SIZE);
+ return -EINVAL;
+ }
+ sport->port_attrib.srp_max_rsp_size = val;
+
+ return count;
+}
+
+static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,
+ char *page)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+
+ return sysfs_emit(page, "%u\n", sport->port_attrib.srp_sq_size);
+}
+
+static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+ unsigned long val;
+ int ret;
+
+ ret = kstrtoul(page, 0, &val);
+ if (ret < 0) {
+ pr_err("kstrtoul() failed with ret: %d\n", ret);
+ return -EINVAL;
+ }
+ if (val > MAX_SRPT_SRQ_SIZE) {
+ pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
+ MAX_SRPT_SRQ_SIZE);
+ return -EINVAL;
+ }
+ if (val < MIN_SRPT_SRQ_SIZE) {
+ pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
+ MIN_SRPT_SRQ_SIZE);
+ return -EINVAL;
+ }
+ sport->port_attrib.srp_sq_size = val;
+
+ return count;
+}
+
+static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item,
+ char *page)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+
+ return sysfs_emit(page, "%d\n", sport->port_attrib.use_srq);
+}
+
+static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+ struct srpt_device *sdev = sport->sdev;
+ unsigned long val;
+ bool enabled;
+ int ret;
+
+ ret = kstrtoul(page, 0, &val);
+ if (ret < 0)
+ return ret;
+ if (val != !!val)
+ return -EINVAL;
+
+ ret = mutex_lock_interruptible(&sdev->sdev_mutex);
+ if (ret < 0)
+ return ret;
+ ret = mutex_lock_interruptible(&sport->mutex);
+ if (ret < 0)
+ goto unlock_sdev;
+ enabled = sport->enabled;
+ /* Log out all initiator systems before changing 'use_srq'. */
+ srpt_set_enabled(sport, false);
+ sport->port_attrib.use_srq = val;
+ srpt_use_srq(sdev, sport->port_attrib.use_srq);
+ srpt_set_enabled(sport, enabled);
+ ret = count;
+ mutex_unlock(&sport->mutex);
+unlock_sdev:
+ mutex_unlock(&sdev->sdev_mutex);
+
+ return ret;
+}
+
+CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);
+CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);
+CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);
+CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq);
+
+static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
+ &srpt_tpg_attrib_attr_srp_max_rdma_size,
+ &srpt_tpg_attrib_attr_srp_max_rsp_size,
+ &srpt_tpg_attrib_attr_srp_sq_size,
+ &srpt_tpg_attrib_attr_use_srq,
+ NULL,
+};
+
+static struct rdma_cm_id *srpt_create_rdma_id(struct sockaddr *listen_addr)
+{
+ struct rdma_cm_id *rdma_cm_id;
+ int ret;
+
+ rdma_cm_id = rdma_create_id(&init_net, srpt_rdma_cm_handler,
+ NULL, RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(rdma_cm_id)) {
+ pr_err("RDMA/CM ID creation failed: %ld\n",
+ PTR_ERR(rdma_cm_id));
+ goto out;
+ }
+
+ ret = rdma_bind_addr(rdma_cm_id, listen_addr);
+ if (ret) {
+ char addr_str[64];
+
+ snprintf(addr_str, sizeof(addr_str), "%pISp", listen_addr);
+ pr_err("Binding RDMA/CM ID to address %s failed: %d\n",
+ addr_str, ret);
+ rdma_destroy_id(rdma_cm_id);
+ rdma_cm_id = ERR_PTR(ret);
+ goto out;
+ }
+
+ ret = rdma_listen(rdma_cm_id, 128);
+ if (ret) {
+ pr_err("rdma_listen() failed: %d\n", ret);
+ rdma_destroy_id(rdma_cm_id);
+ rdma_cm_id = ERR_PTR(ret);
+ }
+
+out:
+ return rdma_cm_id;
+}
+
+static ssize_t srpt_rdma_cm_port_show(struct config_item *item, char *page)
+{
+ return sysfs_emit(page, "%d\n", rdma_cm_port);
+}
+
+static ssize_t srpt_rdma_cm_port_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct sockaddr_in addr4 = { .sin_family = AF_INET };
+ struct sockaddr_in6 addr6 = { .sin6_family = AF_INET6 };
+ struct rdma_cm_id *new_id = NULL;
+ u16 val;
+ int ret;
+
+ ret = kstrtou16(page, 0, &val);
+ if (ret < 0)
+ return ret;
+ ret = count;
+ if (rdma_cm_port == val)
+ goto out;
+
+ if (val) {
+ addr6.sin6_port = cpu_to_be16(val);
+ new_id = srpt_create_rdma_id((struct sockaddr *)&addr6);
+ if (IS_ERR(new_id)) {
+ addr4.sin_port = cpu_to_be16(val);
+ new_id = srpt_create_rdma_id((struct sockaddr *)&addr4);
+ if (IS_ERR(new_id)) {
+ ret = PTR_ERR(new_id);
+ goto out;
+ }
+ }
+ }
+
+ mutex_lock(&rdma_cm_mutex);
+ rdma_cm_port = val;
+ swap(rdma_cm_id, new_id);
+ mutex_unlock(&rdma_cm_mutex);
+
+ if (new_id)
+ rdma_destroy_id(new_id);
+ ret = count;
+out:
+ return ret;
+}
+
+CONFIGFS_ATTR(srpt_, rdma_cm_port);
+
+static struct configfs_attribute *srpt_da_attrs[] = {
+ &srpt_attr_rdma_cm_port,
+ NULL,
+};
+
+static int srpt_enable_tpg(struct se_portal_group *se_tpg, bool enable)
+{
+ struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
+
+ mutex_lock(&sport->mutex);
+ srpt_set_enabled(sport, enable);
+ mutex_unlock(&sport->mutex);
+
+ return 0;
+}
+
+/**
+ * srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg
+ * @wwn: Corresponds to $driver/$port.
+ * @name: $tpg.
+ */
+static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
+ const char *name)
+{
+ struct srpt_port_id *sport_id = srpt_wwn_to_sport_id(wwn);
+ struct srpt_tpg *stpg;
+ int res = -ENOMEM;
+
+ stpg = kzalloc(sizeof(*stpg), GFP_KERNEL);
+ if (!stpg)
+ return ERR_PTR(res);
+ stpg->sport_id = sport_id;
+ res = core_tpg_register(wwn, &stpg->tpg, SCSI_PROTOCOL_SRP);
+ if (res) {
+ kfree(stpg);
+ return ERR_PTR(res);
+ }
+
+ mutex_lock(&sport_id->mutex);
+ list_add_tail(&stpg->entry, &sport_id->tpg_list);
+ mutex_unlock(&sport_id->mutex);
+
+ return &stpg->tpg;
+}
+
+/**
+ * srpt_drop_tpg - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port/$tpg
+ * @tpg: Target portal group to deregister.
+ */
+static void srpt_drop_tpg(struct se_portal_group *tpg)
+{
+ struct srpt_tpg *stpg = container_of(tpg, typeof(*stpg), tpg);
+ struct srpt_port_id *sport_id = stpg->sport_id;
+ struct srpt_port *sport = srpt_tpg_to_sport(tpg);
+
+ mutex_lock(&sport_id->mutex);
+ list_del(&stpg->entry);
+ mutex_unlock(&sport_id->mutex);
+
+ sport->enabled = false;
+ core_tpg_deregister(tpg);
+ kfree(stpg);
+}
+
+/**
+ * srpt_make_tport - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port
+ * @tf: Not used.
+ * @group: Not used.
+ * @name: $port.
+ */
+static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
+ struct config_group *group,
+ const char *name)
+{
+ struct port_and_port_id papi = srpt_lookup_port(name);
+ struct srpt_port *sport = papi.sport;
+ struct srpt_port_id *port_id;
+
+ if (!papi.port_id)
+ return ERR_PTR(-EINVAL);
+ if (*papi.port_id) {
+ /* Attempt to create a directory that already exists. */
+ WARN_ON_ONCE(true);
+ return &(*papi.port_id)->wwn;
+ }
+ port_id = kzalloc(sizeof(*port_id), GFP_KERNEL);
+ if (!port_id) {
+ srpt_sdev_put(sport->sdev);
+ return ERR_PTR(-ENOMEM);
+ }
+ mutex_init(&port_id->mutex);
+ INIT_LIST_HEAD(&port_id->tpg_list);
+ port_id->wwn.priv = sport;
+ memcpy(port_id->name, port_id == sport->guid_id ? sport->guid_name :
+ sport->gid_name, ARRAY_SIZE(port_id->name));
+
+ *papi.port_id = port_id;
+
+ return &port_id->wwn;
+}
+
+/**
+ * srpt_drop_tport - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port
+ * @wwn: $port.
+ */
+static void srpt_drop_tport(struct se_wwn *wwn)
+{
+ struct srpt_port_id *port_id = container_of(wwn, typeof(*port_id), wwn);
+ struct srpt_port *sport = wwn->priv;
+
+ if (sport->guid_id == port_id)
+ sport->guid_id = NULL;
+ else if (sport->gid_id == port_id)
+ sport->gid_id = NULL;
+ else
+ WARN_ON_ONCE(true);
+
+ srpt_sdev_put(sport->sdev);
+ kfree(port_id);
+}
+
+static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)
+{
+ return sysfs_emit(buf, "\n");
+}
+
+CONFIGFS_ATTR_RO(srpt_wwn_, version);
+
+static struct configfs_attribute *srpt_wwn_attrs[] = {
+ &srpt_wwn_attr_version,
+ NULL,
+};
+
+static const struct target_core_fabric_ops srpt_template = {
+ .module = THIS_MODULE,
+ .fabric_name = "srpt",
+ .tpg_get_wwn = srpt_get_fabric_wwn,
+ .tpg_get_tag = srpt_get_tag,
+ .tpg_check_demo_mode = srpt_check_false,
+ .tpg_check_demo_mode_cache = srpt_check_true,
+ .tpg_check_demo_mode_write_protect = srpt_check_true,
+ .tpg_check_prod_mode_write_protect = srpt_check_false,
+ .tpg_get_inst_index = srpt_tpg_get_inst_index,
+ .release_cmd = srpt_release_cmd,
+ .check_stop_free = srpt_check_stop_free,
+ .close_session = srpt_close_session,
+ .sess_get_index = srpt_sess_get_index,
+ .sess_get_initiator_sid = NULL,
+ .write_pending = srpt_write_pending,
+ .set_default_node_attributes = srpt_set_default_node_attrs,
+ .get_cmd_state = srpt_get_tcm_cmd_state,
+ .queue_data_in = srpt_queue_data_in,
+ .queue_status = srpt_queue_status,
+ .queue_tm_rsp = srpt_queue_tm_rsp,
+ .aborted_task = srpt_aborted_task,
+ /*
+ * Setup function pointers for generic logic in
+ * target_core_fabric_configfs.c
+ */
+ .fabric_make_wwn = srpt_make_tport,
+ .fabric_drop_wwn = srpt_drop_tport,
+ .fabric_make_tpg = srpt_make_tpg,
+ .fabric_enable_tpg = srpt_enable_tpg,
+ .fabric_drop_tpg = srpt_drop_tpg,
+ .fabric_init_nodeacl = srpt_init_nodeacl,
+
+ .tfc_discovery_attrs = srpt_da_attrs,
+ .tfc_wwn_attrs = srpt_wwn_attrs,
+ .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
+};
+
+/**
+ * srpt_init_module - kernel module initialization
+ *
+ * Note: Since ib_register_client() registers callback functions, and since at
+ * least one of these callback functions (srpt_add_one()) calls target core
+ * functions, this driver must be registered with the target core before
+ * ib_register_client() is called.
+ */
+static int __init srpt_init_module(void)
+{
+ int ret;
+
+ ret = -EINVAL;
+ if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
+ pr_err("invalid value %d for kernel module parameter srp_max_req_size -- must be at least %d.\n",
+ srp_max_req_size, MIN_MAX_REQ_SIZE);
+ goto out;
+ }
+
+ if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
+ || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
+ pr_err("invalid value %d for kernel module parameter srpt_srq_size -- must be in the range [%d..%d].\n",
+ srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
+ goto out;
+ }
+
+ ret = target_register_template(&srpt_template);
+ if (ret)
+ goto out;
+
+ ret = ib_register_client(&srpt_client);
+ if (ret) {
+ pr_err("couldn't register IB client\n");
+ goto out_unregister_target;
+ }
+
+ return 0;
+
+out_unregister_target:
+ target_unregister_template(&srpt_template);
+out:
+ return ret;
+}
+
+static void __exit srpt_cleanup_module(void)
+{
+ if (rdma_cm_id)
+ rdma_destroy_id(rdma_cm_id);
+ ib_unregister_client(&srpt_client);
+ target_unregister_template(&srpt_template);
+}
+
+module_init(srpt_init_module);
+module_exit(srpt_cleanup_module);
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.h b/drivers/infiniband/ulp/srpt/ib_srpt.h
new file mode 100644
index 000000000..4c46b301e
--- /dev/null
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.h
@@ -0,0 +1,469 @@
+/*
+ * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
+ * Copyright (C) 2009 - 2010 Bart Van Assche <bvanassche@acm.org>.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifndef IB_SRPT_H
+#define IB_SRPT_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/wait.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_sa.h>
+#include <rdma/ib_cm.h>
+#include <rdma/rdma_cm.h>
+#include <rdma/rw.h>
+
+#include <scsi/srp.h>
+
+#include "ib_dm_mad.h"
+
+/*
+ * The prefix the ServiceName field must start with in the device management
+ * ServiceEntries attribute pair. See also the SRP specification.
+ */
+#define SRP_SERVICE_NAME_PREFIX "SRP.T10:"
+
+struct srpt_nexus;
+
+enum {
+ /*
+ * SRP IOControllerProfile attributes for SRP target ports that have
+ * not been defined in <scsi/srp.h>. Source: section B.7, table B.7
+ * in the SRP specification.
+ */
+ SRP_PROTOCOL = 0x0108,
+ SRP_PROTOCOL_VERSION = 0x0001,
+ SRP_IO_SUBCLASS = 0x609e,
+ SRP_SEND_TO_IOC = 0x01,
+ SRP_SEND_FROM_IOC = 0x02,
+ SRP_RDMA_READ_FROM_IOC = 0x08,
+ SRP_RDMA_WRITE_FROM_IOC = 0x20,
+
+ /*
+ * srp_login_cmd.req_flags bitmasks. See also table 9 in the SRP
+ * specification.
+ */
+ SRP_MTCH_ACTION = 0x03, /* MULTI-CHANNEL ACTION */
+ SRP_LOSOLNT = 0x10, /* logout solicited notification */
+ SRP_CRSOLNT = 0x20, /* credit request solicited notification */
+ SRP_AESOLNT = 0x40, /* asynchronous event solicited notification */
+
+ /*
+ * srp_cmd.sol_nt / srp_tsk_mgmt.sol_not bitmasks. See also tables
+ * 18 and 20 in the SRP specification.
+ */
+ SRP_SCSOLNT = 0x02, /* SCSOLNT = successful solicited notification */
+ SRP_UCSOLNT = 0x04, /* UCSOLNT = unsuccessful solicited notification */
+
+ /*
+ * srp_rsp.sol_not / srp_t_logout.sol_not bitmasks. See also tables
+ * 16 and 22 in the SRP specification.
+ */
+ SRP_SOLNT = 0x01, /* SOLNT = solicited notification */
+
+ /* See also table 24 in the SRP specification. */
+ SRP_TSK_MGMT_SUCCESS = 0x00,
+ SRP_TSK_MGMT_FUNC_NOT_SUPP = 0x04,
+ SRP_TSK_MGMT_FAILED = 0x05,
+
+ /* See also table 21 in the SRP specification. */
+ SRP_CMD_SIMPLE_Q = 0x0,
+ SRP_CMD_HEAD_OF_Q = 0x1,
+ SRP_CMD_ORDERED_Q = 0x2,
+ SRP_CMD_ACA = 0x4,
+
+ SRPT_DEF_SG_TABLESIZE = 128,
+
+ MIN_SRPT_SQ_SIZE = 16,
+ DEF_SRPT_SQ_SIZE = 4096,
+ MAX_SRPT_RQ_SIZE = 128,
+ MIN_SRPT_SRQ_SIZE = 4,
+ DEFAULT_SRPT_SRQ_SIZE = 4095,
+ MAX_SRPT_SRQ_SIZE = 65535,
+ MAX_SRPT_RDMA_SIZE = 1U << 24,
+ MAX_SRPT_RSP_SIZE = 1024,
+
+ SRP_MAX_ADD_CDB_LEN = 16,
+ SRP_MAX_IMM_DATA_OFFSET = 80,
+ SRP_MAX_IMM_DATA = 8 * 1024,
+ MIN_MAX_REQ_SIZE = 996,
+ DEFAULT_MAX_REQ_SIZE_1 = sizeof(struct srp_cmd)/*48*/ +
+ SRP_MAX_ADD_CDB_LEN +
+ sizeof(struct srp_indirect_buf)/*20*/ +
+ 128 * sizeof(struct srp_direct_buf)/*16*/,
+ DEFAULT_MAX_REQ_SIZE_2 = SRP_MAX_IMM_DATA_OFFSET +
+ sizeof(struct srp_imm_buf) + SRP_MAX_IMM_DATA,
+ DEFAULT_MAX_REQ_SIZE = DEFAULT_MAX_REQ_SIZE_1 > DEFAULT_MAX_REQ_SIZE_2 ?
+ DEFAULT_MAX_REQ_SIZE_1 : DEFAULT_MAX_REQ_SIZE_2,
+
+ MIN_MAX_RSP_SIZE = sizeof(struct srp_rsp)/*36*/ + 4,
+ DEFAULT_MAX_RSP_SIZE = 256, /* leaves 220 bytes for sense data */
+
+ DEFAULT_MAX_RDMA_SIZE = 65536,
+};
+
+/**
+ * enum srpt_command_state - SCSI command state managed by SRPT
+ * @SRPT_STATE_NEW: New command arrived and is being processed.
+ * @SRPT_STATE_NEED_DATA: Processing a write or bidir command and waiting
+ * for data arrival.
+ * @SRPT_STATE_DATA_IN: Data for the write or bidir command arrived and is
+ * being processed.
+ * @SRPT_STATE_CMD_RSP_SENT: SRP_RSP for SRP_CMD has been sent.
+ * @SRPT_STATE_MGMT: Processing a SCSI task management command.
+ * @SRPT_STATE_MGMT_RSP_SENT: SRP_RSP for SRP_TSK_MGMT has been sent.
+ * @SRPT_STATE_DONE: Command processing finished successfully, command
+ * processing has been aborted or command processing
+ * failed.
+ */
+enum srpt_command_state {
+ SRPT_STATE_NEW = 0,
+ SRPT_STATE_NEED_DATA = 1,
+ SRPT_STATE_DATA_IN = 2,
+ SRPT_STATE_CMD_RSP_SENT = 3,
+ SRPT_STATE_MGMT = 4,
+ SRPT_STATE_MGMT_RSP_SENT = 5,
+ SRPT_STATE_DONE = 6,
+};
+
+/**
+ * struct srpt_ioctx - shared SRPT I/O context information
+ * @cqe: Completion queue element.
+ * @buf: Pointer to the buffer.
+ * @dma: DMA address of the buffer.
+ * @offset: Offset of the first byte in @buf and @dma that is actually used.
+ * @index: Index of the I/O context in its ioctx_ring array.
+ */
+struct srpt_ioctx {
+ struct ib_cqe cqe;
+ void *buf;
+ dma_addr_t dma;
+ uint32_t offset;
+ uint32_t index;
+};
+
+/**
+ * struct srpt_recv_ioctx - SRPT receive I/O context
+ * @ioctx: See above.
+ * @wait_list: Node for insertion in srpt_rdma_ch.cmd_wait_list.
+ * @byte_len: Number of bytes in @ioctx.buf.
+ */
+struct srpt_recv_ioctx {
+ struct srpt_ioctx ioctx;
+ struct list_head wait_list;
+ int byte_len;
+};
+
+struct srpt_rw_ctx {
+ struct rdma_rw_ctx rw;
+ struct scatterlist *sg;
+ unsigned int nents;
+};
+
+/**
+ * struct srpt_send_ioctx - SRPT send I/O context
+ * @ioctx: See above.
+ * @ch: Channel pointer.
+ * @recv_ioctx: Receive I/O context associated with this send I/O context.
+ * Only used for processing immediate data.
+ * @s_rw_ctx: @rw_ctxs points here if only a single rw_ctx is needed.
+ * @rw_ctxs: RDMA read/write contexts.
+ * @imm_sg: Scatterlist for immediate data.
+ * @rdma_cqe: RDMA completion queue element.
+ * @state: I/O context state.
+ * @cmd: Target core command data structure.
+ * @sense_data: SCSI sense data.
+ * @n_rdma: Number of work requests needed to transfer this ioctx.
+ * @n_rw_ctx: Size of rw_ctxs array.
+ * @queue_status_only: Send a SCSI status back to the initiator but no data.
+ * @sense_data: Sense data to be sent to the initiator.
+ */
+struct srpt_send_ioctx {
+ struct srpt_ioctx ioctx;
+ struct srpt_rdma_ch *ch;
+ struct srpt_recv_ioctx *recv_ioctx;
+
+ struct srpt_rw_ctx s_rw_ctx;
+ struct srpt_rw_ctx *rw_ctxs;
+
+ struct scatterlist imm_sg;
+
+ struct ib_cqe rdma_cqe;
+ enum srpt_command_state state;
+ struct se_cmd cmd;
+ u8 n_rdma;
+ u8 n_rw_ctx;
+ bool queue_status_only;
+ u8 sense_data[TRANSPORT_SENSE_BUFFER];
+};
+
+/**
+ * enum rdma_ch_state - SRP channel state
+ * @CH_CONNECTING: QP is in RTR state; waiting for RTU.
+ * @CH_LIVE: QP is in RTS state.
+ * @CH_DISCONNECTING: DREQ has been sent and waiting for DREP or DREQ has
+ * been received.
+ * @CH_DRAINING: DREP has been received or waiting for DREP timed out
+ * and last work request has been queued.
+ * @CH_DISCONNECTED: Last completion has been received.
+ */
+enum rdma_ch_state {
+ CH_CONNECTING,
+ CH_LIVE,
+ CH_DISCONNECTING,
+ CH_DRAINING,
+ CH_DISCONNECTED,
+};
+
+/**
+ * struct srpt_rdma_ch - RDMA channel
+ * @nexus: I_T nexus this channel is associated with.
+ * @qp: IB queue pair used for communicating over this channel.
+ * @ib_cm: See below.
+ * @ib_cm.cm_id: IB CM ID associated with the channel.
+ * @rdma_cm: See below.
+ * @rdma_cm.cm_id: RDMA CM ID associated with the channel.
+ * @cq: IB completion queue for this channel.
+ * @cq_size: Number of CQEs in @cq.
+ * @zw_cqe: Zero-length write CQE.
+ * @rcu: RCU head.
+ * @kref: kref for this channel.
+ * @closed: Completion object that will be signaled as soon as a new
+ * channel object with the same identity can be created.
+ * @rq_size: IB receive queue size.
+ * @max_rsp_size: Maximum size of an RSP response message in bytes.
+ * @sq_wr_avail: number of work requests available in the send queue.
+ * @sport: pointer to the information of the HCA port used by this
+ * channel.
+ * @max_ti_iu_len: maximum target-to-initiator information unit length.
+ * @req_lim: request limit: maximum number of requests that may be sent
+ * by the initiator without having received a response.
+ * @req_lim_delta: Number of credits not yet sent back to the initiator.
+ * @imm_data_offset: Offset from start of SRP_CMD for immediate data.
+ * @spinlock: Protects free_list and state.
+ * @state: channel state. See also enum rdma_ch_state.
+ * @using_rdma_cm: Whether the RDMA/CM or IB/CM is used for this channel.
+ * @processing_wait_list: Whether or not cmd_wait_list is being processed.
+ * @rsp_buf_cache: kmem_cache for @ioctx_ring.
+ * @ioctx_ring: Send ring.
+ * @req_buf_cache: kmem_cache for @ioctx_recv_ring.
+ * @ioctx_recv_ring: Receive I/O context ring.
+ * @list: Node in srpt_nexus.ch_list.
+ * @cmd_wait_list: List of SCSI commands that arrived before the RTU event. This
+ * list contains struct srpt_ioctx elements and is protected
+ * against concurrent modification by the cm_id spinlock.
+ * @pkey: P_Key of the IB partition for this SRP channel.
+ * @sess: Session information associated with this SRP channel.
+ * @sess_name: Session name.
+ * @release_work: Allows scheduling of srpt_release_channel().
+ */
+struct srpt_rdma_ch {
+ struct srpt_nexus *nexus;
+ struct ib_qp *qp;
+ union {
+ struct {
+ struct ib_cm_id *cm_id;
+ } ib_cm;
+ struct {
+ struct rdma_cm_id *cm_id;
+ } rdma_cm;
+ };
+ struct ib_cq *cq;
+ u32 cq_size;
+ struct ib_cqe zw_cqe;
+ struct rcu_head rcu;
+ struct kref kref;
+ struct completion *closed;
+ int rq_size;
+ u32 max_rsp_size;
+ atomic_t sq_wr_avail;
+ struct srpt_port *sport;
+ int max_ti_iu_len;
+ atomic_t req_lim;
+ atomic_t req_lim_delta;
+ u16 imm_data_offset;
+ spinlock_t spinlock;
+ enum rdma_ch_state state;
+ struct kmem_cache *rsp_buf_cache;
+ struct srpt_send_ioctx **ioctx_ring;
+ struct kmem_cache *req_buf_cache;
+ struct srpt_recv_ioctx **ioctx_recv_ring;
+ struct list_head list;
+ struct list_head cmd_wait_list;
+ uint16_t pkey;
+ bool using_rdma_cm;
+ bool processing_wait_list;
+ struct se_session *sess;
+ u8 sess_name[40];
+ struct work_struct release_work;
+};
+
+/**
+ * struct srpt_nexus - I_T nexus
+ * @rcu: RCU head for this data structure.
+ * @entry: srpt_port.nexus_list list node.
+ * @ch_list: struct srpt_rdma_ch list. Protected by srpt_port.mutex.
+ * @i_port_id: 128-bit initiator port identifier copied from SRP_LOGIN_REQ.
+ * @t_port_id: 128-bit target port identifier copied from SRP_LOGIN_REQ.
+ */
+struct srpt_nexus {
+ struct rcu_head rcu;
+ struct list_head entry;
+ struct list_head ch_list;
+ u8 i_port_id[16];
+ u8 t_port_id[16];
+};
+
+/**
+ * struct srpt_port_attrib - attributes for SRPT port
+ * @srp_max_rdma_size: Maximum size of SRP RDMA transfers for new connections.
+ * @srp_max_rsp_size: Maximum size of SRP response messages in bytes.
+ * @srp_sq_size: Shared receive queue (SRQ) size.
+ * @use_srq: Whether or not to use SRQ.
+ */
+struct srpt_port_attrib {
+ u32 srp_max_rdma_size;
+ u32 srp_max_rsp_size;
+ u32 srp_sq_size;
+ bool use_srq;
+};
+
+/**
+ * struct srpt_tpg - information about a single "target portal group"
+ * @entry: Entry in @sport_id->tpg_list.
+ * @sport_id: Port name this TPG is associated with.
+ * @tpg: LIO TPG data structure.
+ *
+ * Zero or more target portal groups are associated with each port name
+ * (srpt_port_id). With each TPG an ACL list is associated.
+ */
+struct srpt_tpg {
+ struct list_head entry;
+ struct srpt_port_id *sport_id;
+ struct se_portal_group tpg;
+};
+
+/**
+ * struct srpt_port_id - LIO RDMA port information
+ * @mutex: Protects @tpg_list changes.
+ * @tpg_list: TPGs associated with the RDMA port name.
+ * @wwn: WWN associated with the RDMA port name.
+ * @name: ASCII representation of the port name.
+ *
+ * Multiple sysfs directories can be associated with a single RDMA port. This
+ * data structure represents a single (port, name) pair.
+ */
+struct srpt_port_id {
+ struct mutex mutex;
+ struct list_head tpg_list;
+ struct se_wwn wwn;
+ char name[64];
+};
+
+/**
+ * struct srpt_port - SRPT RDMA port information
+ * @sdev: backpointer to the HCA information.
+ * @mad_agent: per-port management datagram processing information.
+ * @enabled: Whether or not this target port is enabled.
+ * @port: one-based port number.
+ * @sm_lid: cached value of the port's sm_lid.
+ * @lid: cached value of the port's lid.
+ * @gid: cached value of the port's gid.
+ * @work: work structure for refreshing the aforementioned cached values.
+ * @guid_name: port name in GUID format.
+ * @guid_id: LIO target port information for the port name in GUID format.
+ * @gid_name: port name in GID format.
+ * @gid_id: LIO target port information for the port name in GID format.
+ * @port_attrib: Port attributes that can be accessed through configfs.
+ * @refcount: Number of objects associated with this port.
+ * @freed_channels: Completion that will be signaled once @refcount becomes 0.
+ * @mutex: Protects nexus_list.
+ * @nexus_list: Nexus list. See also srpt_nexus.entry.
+ */
+struct srpt_port {
+ struct srpt_device *sdev;
+ struct ib_mad_agent *mad_agent;
+ bool enabled;
+ u8 port;
+ u32 sm_lid;
+ u32 lid;
+ union ib_gid gid;
+ struct work_struct work;
+ char guid_name[64];
+ struct srpt_port_id *guid_id;
+ char gid_name[64];
+ struct srpt_port_id *gid_id;
+ struct srpt_port_attrib port_attrib;
+ atomic_t refcount;
+ struct completion *freed_channels;
+ struct mutex mutex;
+ struct list_head nexus_list;
+};
+
+/**
+ * struct srpt_device - information associated by SRPT with a single HCA
+ * @refcnt: Reference count for this device.
+ * @device: Backpointer to the struct ib_device managed by the IB core.
+ * @pd: IB protection domain.
+ * @lkey: L_Key (local key) with write access to all local memory.
+ * @srq: Per-HCA SRQ (shared receive queue).
+ * @cm_id: Connection identifier.
+ * @srq_size: SRQ size.
+ * @sdev_mutex: Serializes use_srq changes.
+ * @use_srq: Whether or not to use SRQ.
+ * @req_buf_cache: kmem_cache for @ioctx_ring buffers.
+ * @ioctx_ring: Per-HCA SRQ.
+ * @event_handler: Per-HCA asynchronous IB event handler.
+ * @list: Node in srpt_dev_list.
+ * @port: Information about the ports owned by this HCA.
+ */
+struct srpt_device {
+ struct kref refcnt;
+ struct ib_device *device;
+ struct ib_pd *pd;
+ u32 lkey;
+ struct ib_srq *srq;
+ struct ib_cm_id *cm_id;
+ int srq_size;
+ struct mutex sdev_mutex;
+ bool use_srq;
+ struct kmem_cache *req_buf_cache;
+ struct srpt_recv_ioctx **ioctx_ring;
+ struct ib_event_handler event_handler;
+ struct list_head list;
+ struct srpt_port port[];
+};
+
+#endif /* IB_SRPT_H */