2 * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
3 * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/err.h>
39 #include <linux/ctype.h>
40 #include <linux/kthread.h>
41 #include <linux/string.h>
42 #include <linux/delay.h>
43 #include <linux/atomic.h>
44 #include <scsi/scsi_proto.h>
45 #include <scsi/scsi_tcq.h>
46 #include <target/configfs_macros.h>
47 #include <target/target_core_base.h>
48 #include <target/target_core_fabric_configfs.h>
49 #include <target/target_core_fabric.h>
52 /* Name of this kernel module. */
53 #define DRV_NAME "ib_srpt"
54 #define DRV_VERSION "2.0.0"
55 #define DRV_RELDATE "2011-02-14"
57 #define SRPT_ID_STRING "Linux SRP target"
60 #define pr_fmt(fmt) DRV_NAME " " fmt
62 MODULE_AUTHOR("Vu Pham and Bart Van Assche");
63 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
64 "v" DRV_VERSION " (" DRV_RELDATE ")");
65 MODULE_LICENSE("Dual BSD/GPL");
71 static u64 srpt_service_guid;
72 static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */
73 static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */
75 static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
76 module_param(srp_max_req_size, int, 0444);
77 MODULE_PARM_DESC(srp_max_req_size,
78 "Maximum size of SRP request messages in bytes.");
80 static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
81 module_param(srpt_srq_size, int, 0444);
82 MODULE_PARM_DESC(srpt_srq_size,
83 "Shared receive queue (SRQ) size.");
85 static int srpt_get_u64_x(char *buffer, struct kernel_param *kp)
87 return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
89 module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
91 MODULE_PARM_DESC(srpt_service_guid,
92 "Using this value for ioc_guid, id_ext, and cm_listen_id"
93 " instead of using the node_guid of the first HCA.");
95 static struct ib_client srpt_client;
96 static void srpt_release_channel(struct srpt_rdma_ch *ch);
97 static int srpt_queue_status(struct se_cmd *cmd);
100 * opposite_dma_dir() - Swap DMA_TO_DEVICE and DMA_FROM_DEVICE.
103 enum dma_data_direction opposite_dma_dir(enum dma_data_direction dir)
106 case DMA_TO_DEVICE: return DMA_FROM_DEVICE;
107 case DMA_FROM_DEVICE: return DMA_TO_DEVICE;
113 * srpt_sdev_name() - Return the name associated with the HCA.
115 * Examples are ib0, ib1, ...
117 static inline const char *srpt_sdev_name(struct srpt_device *sdev)
119 return sdev->device->name;
122 static enum rdma_ch_state srpt_get_ch_state(struct srpt_rdma_ch *ch)
125 enum rdma_ch_state state;
127 spin_lock_irqsave(&ch->spinlock, flags);
129 spin_unlock_irqrestore(&ch->spinlock, flags);
133 static enum rdma_ch_state
134 srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new_state)
137 enum rdma_ch_state prev;
139 spin_lock_irqsave(&ch->spinlock, flags);
141 ch->state = new_state;
142 spin_unlock_irqrestore(&ch->spinlock, flags);
147 * srpt_test_and_set_ch_state() - Test and set the channel state.
149 * Returns true if and only if the channel state has been set to the new state.
152 srpt_test_and_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state old,
153 enum rdma_ch_state new)
156 enum rdma_ch_state prev;
158 spin_lock_irqsave(&ch->spinlock, flags);
162 spin_unlock_irqrestore(&ch->spinlock, flags);
167 * srpt_event_handler() - Asynchronous IB event callback function.
169 * Callback function called by the InfiniBand core when an asynchronous IB
170 * event occurs. This callback may occur in interrupt context. See also
171 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
172 * Architecture Specification.
174 static void srpt_event_handler(struct ib_event_handler *handler,
175 struct ib_event *event)
177 struct srpt_device *sdev;
178 struct srpt_port *sport;
180 sdev = ib_get_client_data(event->device, &srpt_client);
181 if (!sdev || sdev->device != event->device)
184 pr_debug("ASYNC event= %d on device= %s\n", event->event,
185 srpt_sdev_name(sdev));
187 switch (event->event) {
188 case IB_EVENT_PORT_ERR:
189 if (event->element.port_num <= sdev->device->phys_port_cnt) {
190 sport = &sdev->port[event->element.port_num - 1];
195 case IB_EVENT_PORT_ACTIVE:
196 case IB_EVENT_LID_CHANGE:
197 case IB_EVENT_PKEY_CHANGE:
198 case IB_EVENT_SM_CHANGE:
199 case IB_EVENT_CLIENT_REREGISTER:
200 case IB_EVENT_GID_CHANGE:
201 /* Refresh port data asynchronously. */
202 if (event->element.port_num <= sdev->device->phys_port_cnt) {
203 sport = &sdev->port[event->element.port_num - 1];
204 if (!sport->lid && !sport->sm_lid)
205 schedule_work(&sport->work);
209 pr_err("received unrecognized IB event %d\n",
216 * srpt_srq_event() - SRQ event callback function.
218 static void srpt_srq_event(struct ib_event *event, void *ctx)
220 pr_info("SRQ event %d\n", event->event);
224 * srpt_qp_event() - QP event callback function.
226 static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
228 pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n",
229 event->event, ch->cm_id, ch->sess_name, srpt_get_ch_state(ch));
231 switch (event->event) {
232 case IB_EVENT_COMM_EST:
233 ib_cm_notify(ch->cm_id, event->event);
235 case IB_EVENT_QP_LAST_WQE_REACHED:
236 if (srpt_test_and_set_ch_state(ch, CH_DRAINING,
238 srpt_release_channel(ch);
240 pr_debug("%s: state %d - ignored LAST_WQE.\n",
241 ch->sess_name, srpt_get_ch_state(ch));
244 pr_err("received unrecognized IB QP event %d\n", event->event);
250 * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure.
252 * @slot: one-based slot number.
253 * @value: four-bit value.
255 * Copies the lowest four bits of value in element slot of the array of four
256 * bit elements called c_list (controller list). The index slot is one-based.
258 static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
265 tmp = c_list[id] & 0xf;
266 c_list[id] = (value << 4) | tmp;
268 tmp = c_list[id] & 0xf0;
269 c_list[id] = (value & 0xf) | tmp;
274 * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram.
276 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
279 static void srpt_get_class_port_info(struct ib_dm_mad *mad)
281 struct ib_class_port_info *cif;
283 cif = (struct ib_class_port_info *)mad->data;
284 memset(cif, 0, sizeof *cif);
285 cif->base_version = 1;
286 cif->class_version = 1;
287 cif->resp_time_value = 20;
289 mad->mad_hdr.status = 0;
293 * srpt_get_iou() - Write IOUnitInfo to a management datagram.
295 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
296 * Specification. See also section B.7, table B.6 in the SRP r16a document.
298 static void srpt_get_iou(struct ib_dm_mad *mad)
300 struct ib_dm_iou_info *ioui;
304 ioui = (struct ib_dm_iou_info *)mad->data;
305 ioui->change_id = cpu_to_be16(1);
306 ioui->max_controllers = 16;
308 /* set present for slot 1 and empty for the rest */
309 srpt_set_ioc(ioui->controller_list, 1, 1);
310 for (i = 1, slot = 2; i < 16; i++, slot++)
311 srpt_set_ioc(ioui->controller_list, slot, 0);
313 mad->mad_hdr.status = 0;
317 * srpt_get_ioc() - Write IOControllerprofile to a management datagram.
319 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
320 * Architecture Specification. See also section B.7, table B.7 in the SRP
323 static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
324 struct ib_dm_mad *mad)
326 struct srpt_device *sdev = sport->sdev;
327 struct ib_dm_ioc_profile *iocp;
329 iocp = (struct ib_dm_ioc_profile *)mad->data;
331 if (!slot || slot > 16) {
333 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
339 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
343 memset(iocp, 0, sizeof *iocp);
344 strcpy(iocp->id_string, SRPT_ID_STRING);
345 iocp->guid = cpu_to_be64(srpt_service_guid);
346 iocp->vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
347 iocp->device_id = cpu_to_be32(sdev->dev_attr.vendor_part_id);
348 iocp->device_version = cpu_to_be16(sdev->dev_attr.hw_ver);
349 iocp->subsys_vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
350 iocp->subsys_device_id = 0x0;
351 iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
352 iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
353 iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
354 iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
355 iocp->send_queue_depth = cpu_to_be16(sdev->srq_size);
356 iocp->rdma_read_depth = 4;
357 iocp->send_size = cpu_to_be32(srp_max_req_size);
358 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
360 iocp->num_svc_entries = 1;
361 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
362 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
364 mad->mad_hdr.status = 0;
368 * srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
370 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
371 * Specification. See also section B.7, table B.8 in the SRP r16a document.
373 static void srpt_get_svc_entries(u64 ioc_guid,
374 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
376 struct ib_dm_svc_entries *svc_entries;
380 if (!slot || slot > 16) {
382 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
386 if (slot > 2 || lo > hi || hi > 1) {
388 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
392 svc_entries = (struct ib_dm_svc_entries *)mad->data;
393 memset(svc_entries, 0, sizeof *svc_entries);
394 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
395 snprintf(svc_entries->service_entries[0].name,
396 sizeof(svc_entries->service_entries[0].name),
398 SRP_SERVICE_NAME_PREFIX,
401 mad->mad_hdr.status = 0;
405 * srpt_mgmt_method_get() - Process a received management datagram.
406 * @sp: source port through which the MAD has been received.
407 * @rq_mad: received MAD.
408 * @rsp_mad: response MAD.
410 static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
411 struct ib_dm_mad *rsp_mad)
417 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
419 case DM_ATTR_CLASS_PORT_INFO:
420 srpt_get_class_port_info(rsp_mad);
422 case DM_ATTR_IOU_INFO:
423 srpt_get_iou(rsp_mad);
425 case DM_ATTR_IOC_PROFILE:
426 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
427 srpt_get_ioc(sp, slot, rsp_mad);
429 case DM_ATTR_SVC_ENTRIES:
430 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
431 hi = (u8) ((slot >> 8) & 0xff);
432 lo = (u8) (slot & 0xff);
433 slot = (u16) ((slot >> 16) & 0xffff);
434 srpt_get_svc_entries(srpt_service_guid,
435 slot, hi, lo, rsp_mad);
438 rsp_mad->mad_hdr.status =
439 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
445 * srpt_mad_send_handler() - Post MAD-send callback function.
447 static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
448 struct ib_mad_send_wc *mad_wc)
450 ib_destroy_ah(mad_wc->send_buf->ah);
451 ib_free_send_mad(mad_wc->send_buf);
455 * srpt_mad_recv_handler() - MAD reception callback function.
457 static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
458 struct ib_mad_recv_wc *mad_wc)
460 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
462 struct ib_mad_send_buf *rsp;
463 struct ib_dm_mad *dm_mad;
465 if (!mad_wc || !mad_wc->recv_buf.mad)
468 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
469 mad_wc->recv_buf.grh, mad_agent->port_num);
473 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
475 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
476 mad_wc->wc->pkey_index, 0,
477 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
479 IB_MGMT_BASE_VERSION);
486 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof *dm_mad);
487 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
488 dm_mad->mad_hdr.status = 0;
490 switch (mad_wc->recv_buf.mad->mad_hdr.method) {
491 case IB_MGMT_METHOD_GET:
492 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
494 case IB_MGMT_METHOD_SET:
495 dm_mad->mad_hdr.status =
496 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
499 dm_mad->mad_hdr.status =
500 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
504 if (!ib_post_send_mad(rsp, NULL)) {
505 ib_free_recv_mad(mad_wc);
506 /* will destroy_ah & free_send_mad in send completion */
510 ib_free_send_mad(rsp);
515 ib_free_recv_mad(mad_wc);
519 * srpt_refresh_port() - Configure a HCA port.
521 * Enable InfiniBand management datagram processing, update the cached sm_lid,
522 * lid and gid values, and register a callback function for processing MADs
523 * on the specified port.
525 * Note: It is safe to call this function more than once for the same port.
527 static int srpt_refresh_port(struct srpt_port *sport)
529 struct ib_mad_reg_req reg_req;
530 struct ib_port_modify port_modify;
531 struct ib_port_attr port_attr;
534 memset(&port_modify, 0, sizeof port_modify);
535 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
536 port_modify.clr_port_cap_mask = 0;
538 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
542 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
546 sport->sm_lid = port_attr.sm_lid;
547 sport->lid = port_attr.lid;
549 ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
553 if (!sport->mad_agent) {
554 memset(®_req, 0, sizeof reg_req);
555 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
556 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
557 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
558 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
560 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
564 srpt_mad_send_handler,
565 srpt_mad_recv_handler,
567 if (IS_ERR(sport->mad_agent)) {
568 ret = PTR_ERR(sport->mad_agent);
569 sport->mad_agent = NULL;
578 port_modify.set_port_cap_mask = 0;
579 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
580 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
588 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
590 * Note: It is safe to call this function more than once for the same device.
592 static void srpt_unregister_mad_agent(struct srpt_device *sdev)
594 struct ib_port_modify port_modify = {
595 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
597 struct srpt_port *sport;
600 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
601 sport = &sdev->port[i - 1];
602 WARN_ON(sport->port != i);
603 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
604 pr_err("disabling MAD processing failed.\n");
605 if (sport->mad_agent) {
606 ib_unregister_mad_agent(sport->mad_agent);
607 sport->mad_agent = NULL;
613 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
615 static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
616 int ioctx_size, int dma_size,
617 enum dma_data_direction dir)
619 struct srpt_ioctx *ioctx;
621 ioctx = kmalloc(ioctx_size, GFP_KERNEL);
625 ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
629 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
630 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
644 * srpt_free_ioctx() - Free an SRPT I/O context structure.
646 static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
647 int dma_size, enum dma_data_direction dir)
652 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
658 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
659 * @sdev: Device to allocate the I/O context ring for.
660 * @ring_size: Number of elements in the I/O context ring.
661 * @ioctx_size: I/O context size.
662 * @dma_size: DMA buffer size.
663 * @dir: DMA data direction.
665 static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
666 int ring_size, int ioctx_size,
667 int dma_size, enum dma_data_direction dir)
669 struct srpt_ioctx **ring;
672 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
673 && ioctx_size != sizeof(struct srpt_send_ioctx));
675 ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
678 for (i = 0; i < ring_size; ++i) {
679 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
688 srpt_free_ioctx(sdev, ring[i], dma_size, dir);
696 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
698 static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
699 struct srpt_device *sdev, int ring_size,
700 int dma_size, enum dma_data_direction dir)
704 for (i = 0; i < ring_size; ++i)
705 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
710 * srpt_get_cmd_state() - Get the state of a SCSI command.
712 static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx)
714 enum srpt_command_state state;
719 spin_lock_irqsave(&ioctx->spinlock, flags);
720 state = ioctx->state;
721 spin_unlock_irqrestore(&ioctx->spinlock, flags);
726 * srpt_set_cmd_state() - Set the state of a SCSI command.
728 * Does not modify the state of aborted commands. Returns the previous command
731 static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
732 enum srpt_command_state new)
734 enum srpt_command_state previous;
739 spin_lock_irqsave(&ioctx->spinlock, flags);
740 previous = ioctx->state;
741 if (previous != SRPT_STATE_DONE)
743 spin_unlock_irqrestore(&ioctx->spinlock, flags);
749 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
751 * Returns true if and only if the previous command state was equal to 'old'.
753 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
754 enum srpt_command_state old,
755 enum srpt_command_state new)
757 enum srpt_command_state previous;
761 WARN_ON(old == SRPT_STATE_DONE);
762 WARN_ON(new == SRPT_STATE_NEW);
764 spin_lock_irqsave(&ioctx->spinlock, flags);
765 previous = ioctx->state;
768 spin_unlock_irqrestore(&ioctx->spinlock, flags);
769 return previous == old;
773 * srpt_post_recv() - Post an IB receive request.
775 static int srpt_post_recv(struct srpt_device *sdev,
776 struct srpt_recv_ioctx *ioctx)
779 struct ib_recv_wr wr, *bad_wr;
782 wr.wr_id = encode_wr_id(SRPT_RECV, ioctx->ioctx.index);
784 list.addr = ioctx->ioctx.dma;
785 list.length = srp_max_req_size;
786 list.lkey = sdev->mr->lkey;
792 return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
796 * srpt_post_send() - Post an IB send request.
798 * Returns zero upon success and a non-zero value upon failure.
800 static int srpt_post_send(struct srpt_rdma_ch *ch,
801 struct srpt_send_ioctx *ioctx, int len)
804 struct ib_send_wr wr, *bad_wr;
805 struct srpt_device *sdev = ch->sport->sdev;
808 atomic_inc(&ch->req_lim);
811 if (unlikely(atomic_dec_return(&ch->sq_wr_avail) < 0)) {
812 pr_warn("IB send queue full (needed 1)\n");
816 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len,
819 list.addr = ioctx->ioctx.dma;
821 list.lkey = sdev->mr->lkey;
824 wr.wr_id = encode_wr_id(SRPT_SEND, ioctx->ioctx.index);
827 wr.opcode = IB_WR_SEND;
828 wr.send_flags = IB_SEND_SIGNALED;
830 ret = ib_post_send(ch->qp, &wr, &bad_wr);
834 atomic_inc(&ch->sq_wr_avail);
835 atomic_dec(&ch->req_lim);
841 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
842 * @ioctx: Pointer to the I/O context associated with the request.
843 * @srp_cmd: Pointer to the SRP_CMD request data.
844 * @dir: Pointer to the variable to which the transfer direction will be
846 * @data_len: Pointer to the variable to which the total data length of all
847 * descriptors in the SRP_CMD request will be written.
849 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
851 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
852 * -ENOMEM when memory allocation fails and zero upon success.
854 static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
855 struct srp_cmd *srp_cmd,
856 enum dma_data_direction *dir, u64 *data_len)
858 struct srp_indirect_buf *idb;
859 struct srp_direct_buf *db;
860 unsigned add_cdb_offset;
864 * The pointer computations below will only be compiled correctly
865 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
866 * whether srp_cmd::add_data has been declared as a byte pointer.
868 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0)
869 && !__same_type(srp_cmd->add_data[0], (u8)0));
878 * The lower four bits of the buffer format field contain the DATA-IN
879 * buffer descriptor format, and the highest four bits contain the
880 * DATA-OUT buffer descriptor format.
883 if (srp_cmd->buf_fmt & 0xf)
884 /* DATA-IN: transfer data from target to initiator (read). */
885 *dir = DMA_FROM_DEVICE;
886 else if (srp_cmd->buf_fmt >> 4)
887 /* DATA-OUT: transfer data from initiator to target (write). */
888 *dir = DMA_TO_DEVICE;
891 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
892 * CDB LENGTH' field are reserved and the size in bytes of this field
893 * is four times the value specified in bits 3..7. Hence the "& ~3".
895 add_cdb_offset = srp_cmd->add_cdb_len & ~3;
896 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
897 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
899 ioctx->rbufs = &ioctx->single_rbuf;
901 db = (struct srp_direct_buf *)(srp_cmd->add_data
903 memcpy(ioctx->rbufs, db, sizeof *db);
904 *data_len = be32_to_cpu(db->len);
905 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
906 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
907 idb = (struct srp_indirect_buf *)(srp_cmd->add_data
910 ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof *db;
913 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
914 pr_err("received unsupported SRP_CMD request"
915 " type (%u out + %u in != %u / %zu)\n",
916 srp_cmd->data_out_desc_cnt,
917 srp_cmd->data_in_desc_cnt,
918 be32_to_cpu(idb->table_desc.len),
925 if (ioctx->n_rbuf == 1)
926 ioctx->rbufs = &ioctx->single_rbuf;
929 kmalloc(ioctx->n_rbuf * sizeof *db, GFP_ATOMIC);
938 memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof *db);
939 *data_len = be32_to_cpu(idb->len);
946 * srpt_init_ch_qp() - Initialize queue pair attributes.
948 * Initialized the attributes of queue pair 'qp' by allowing local write,
949 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
951 static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
953 struct ib_qp_attr *attr;
956 attr = kzalloc(sizeof *attr, GFP_KERNEL);
960 attr->qp_state = IB_QPS_INIT;
961 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
962 IB_ACCESS_REMOTE_WRITE;
963 attr->port_num = ch->sport->port;
964 attr->pkey_index = 0;
966 ret = ib_modify_qp(qp, attr,
967 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
975 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
976 * @ch: channel of the queue pair.
977 * @qp: queue pair to change the state of.
979 * Returns zero upon success and a negative value upon failure.
981 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
982 * If this structure ever becomes larger, it might be necessary to allocate
983 * it dynamically instead of on the stack.
985 static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
987 struct ib_qp_attr qp_attr;
991 qp_attr.qp_state = IB_QPS_RTR;
992 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
996 qp_attr.max_dest_rd_atomic = 4;
998 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1005 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1006 * @ch: channel of the queue pair.
1007 * @qp: queue pair to change the state of.
1009 * Returns zero upon success and a negative value upon failure.
1011 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1012 * If this structure ever becomes larger, it might be necessary to allocate
1013 * it dynamically instead of on the stack.
1015 static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1017 struct ib_qp_attr qp_attr;
1021 qp_attr.qp_state = IB_QPS_RTS;
1022 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1026 qp_attr.max_rd_atomic = 4;
1028 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1035 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1037 static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1039 struct ib_qp_attr qp_attr;
1041 qp_attr.qp_state = IB_QPS_ERR;
1042 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1046 * srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list.
1048 static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1049 struct srpt_send_ioctx *ioctx)
1051 struct scatterlist *sg;
1052 enum dma_data_direction dir;
1056 BUG_ON(ioctx->n_rdma && !ioctx->rdma_ius);
1058 while (ioctx->n_rdma)
1059 kfree(ioctx->rdma_ius[--ioctx->n_rdma].sge);
1061 kfree(ioctx->rdma_ius);
1062 ioctx->rdma_ius = NULL;
1064 if (ioctx->mapped_sg_count) {
1067 dir = ioctx->cmd.data_direction;
1068 BUG_ON(dir == DMA_NONE);
1069 ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt,
1070 opposite_dma_dir(dir));
1071 ioctx->mapped_sg_count = 0;
1076 * srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list.
1078 static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1079 struct srpt_send_ioctx *ioctx)
1081 struct ib_device *dev = ch->sport->sdev->device;
1083 struct scatterlist *sg, *sg_orig;
1085 enum dma_data_direction dir;
1086 struct rdma_iu *riu;
1087 struct srp_direct_buf *db;
1088 dma_addr_t dma_addr;
1100 dir = cmd->data_direction;
1101 BUG_ON(dir == DMA_NONE);
1103 ioctx->sg = sg = sg_orig = cmd->t_data_sg;
1104 ioctx->sg_cnt = sg_cnt = cmd->t_data_nents;
1106 count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt,
1107 opposite_dma_dir(dir));
1108 if (unlikely(!count))
1111 ioctx->mapped_sg_count = count;
1113 if (ioctx->rdma_ius && ioctx->n_rdma_ius)
1114 nrdma = ioctx->n_rdma_ius;
1116 nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE
1119 ioctx->rdma_ius = kzalloc(nrdma * sizeof *riu, GFP_KERNEL);
1120 if (!ioctx->rdma_ius)
1123 ioctx->n_rdma_ius = nrdma;
1127 tsize = cmd->data_length;
1128 dma_len = ib_sg_dma_len(dev, &sg[0]);
1129 riu = ioctx->rdma_ius;
1132 * For each remote desc - calculate the #ib_sge.
1133 * If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then
1134 * each remote desc rdma_iu is required a rdma wr;
1136 * we need to allocate extra rdma_iu to carry extra #ib_sge in
1140 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1141 rsize = be32_to_cpu(db->len);
1142 raddr = be64_to_cpu(db->va);
1144 riu->rkey = be32_to_cpu(db->key);
1147 /* calculate how many sge required for this remote_buf */
1148 while (rsize > 0 && tsize > 0) {
1150 if (rsize >= dma_len) {
1159 dma_len = ib_sg_dma_len(
1171 if (rsize > 0 && riu->sge_cnt == SRPT_DEF_SG_PER_WQE) {
1174 kmalloc(riu->sge_cnt * sizeof *riu->sge,
1182 riu->rkey = be32_to_cpu(db->key);
1187 riu->sge = kmalloc(riu->sge_cnt * sizeof *riu->sge,
1194 tsize = cmd->data_length;
1195 riu = ioctx->rdma_ius;
1197 dma_len = ib_sg_dma_len(dev, &sg[0]);
1198 dma_addr = ib_sg_dma_address(dev, &sg[0]);
1200 /* this second loop is really mapped sg_addres to rdma_iu->ib_sge */
1202 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1203 rsize = be32_to_cpu(db->len);
1207 while (rsize > 0 && tsize > 0) {
1208 sge->addr = dma_addr;
1209 sge->lkey = ch->sport->sdev->mr->lkey;
1211 if (rsize >= dma_len) {
1213 (tsize < dma_len) ? tsize : dma_len;
1221 dma_len = ib_sg_dma_len(
1223 dma_addr = ib_sg_dma_address(
1228 sge->length = (tsize < rsize) ? tsize : rsize;
1236 if (k == riu->sge_cnt && rsize > 0 && tsize > 0) {
1240 } else if (rsize > 0 && tsize > 0)
1248 srpt_unmap_sg_to_ib_sge(ch, ioctx);
1254 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1256 static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1258 struct srpt_send_ioctx *ioctx;
1259 unsigned long flags;
1264 spin_lock_irqsave(&ch->spinlock, flags);
1265 if (!list_empty(&ch->free_list)) {
1266 ioctx = list_first_entry(&ch->free_list,
1267 struct srpt_send_ioctx, free_list);
1268 list_del(&ioctx->free_list);
1270 spin_unlock_irqrestore(&ch->spinlock, flags);
1275 BUG_ON(ioctx->ch != ch);
1276 spin_lock_init(&ioctx->spinlock);
1277 ioctx->state = SRPT_STATE_NEW;
1279 ioctx->rbufs = NULL;
1281 ioctx->n_rdma_ius = 0;
1282 ioctx->rdma_ius = NULL;
1283 ioctx->mapped_sg_count = 0;
1284 init_completion(&ioctx->tx_done);
1285 ioctx->queue_status_only = false;
1287 * transport_init_se_cmd() does not initialize all fields, so do it
1290 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1291 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1297 * srpt_abort_cmd() - Abort a SCSI command.
1298 * @ioctx: I/O context associated with the SCSI command.
1299 * @context: Preferred execution context.
1301 static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1303 enum srpt_command_state state;
1304 unsigned long flags;
1309 * If the command is in a state where the target core is waiting for
1310 * the ib_srpt driver, change the state to the next state. Changing
1311 * the state of the command from SRPT_STATE_NEED_DATA to
1312 * SRPT_STATE_DATA_IN ensures that srpt_xmit_response() will call this
1313 * function a second time.
1316 spin_lock_irqsave(&ioctx->spinlock, flags);
1317 state = ioctx->state;
1319 case SRPT_STATE_NEED_DATA:
1320 ioctx->state = SRPT_STATE_DATA_IN;
1322 case SRPT_STATE_DATA_IN:
1323 case SRPT_STATE_CMD_RSP_SENT:
1324 case SRPT_STATE_MGMT_RSP_SENT:
1325 ioctx->state = SRPT_STATE_DONE;
1330 spin_unlock_irqrestore(&ioctx->spinlock, flags);
1332 if (state == SRPT_STATE_DONE) {
1333 struct srpt_rdma_ch *ch = ioctx->ch;
1335 BUG_ON(ch->sess == NULL);
1337 target_put_sess_cmd(&ioctx->cmd);
1341 pr_debug("Aborting cmd with state %d and tag %lld\n", state,
1345 case SRPT_STATE_NEW:
1346 case SRPT_STATE_DATA_IN:
1347 case SRPT_STATE_MGMT:
1349 * Do nothing - defer abort processing until
1350 * srpt_queue_response() is invoked.
1352 WARN_ON(!transport_check_aborted_status(&ioctx->cmd, false));
1354 case SRPT_STATE_NEED_DATA:
1355 /* DMA_TO_DEVICE (write) - RDMA read error. */
1357 /* XXX(hch): this is a horrible layering violation.. */
1358 spin_lock_irqsave(&ioctx->cmd.t_state_lock, flags);
1359 ioctx->cmd.transport_state &= ~CMD_T_ACTIVE;
1360 spin_unlock_irqrestore(&ioctx->cmd.t_state_lock, flags);
1362 case SRPT_STATE_CMD_RSP_SENT:
1364 * SRP_RSP sending failed or the SRP_RSP send completion has
1365 * not been received in time.
1367 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
1368 target_put_sess_cmd(&ioctx->cmd);
1370 case SRPT_STATE_MGMT_RSP_SENT:
1371 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1372 target_put_sess_cmd(&ioctx->cmd);
1375 WARN(1, "Unexpected command state (%d)", state);
1384 * srpt_handle_send_err_comp() - Process an IB_WC_SEND error completion.
1386 static void srpt_handle_send_err_comp(struct srpt_rdma_ch *ch, u64 wr_id)
1388 struct srpt_send_ioctx *ioctx;
1389 enum srpt_command_state state;
1392 atomic_inc(&ch->sq_wr_avail);
1394 index = idx_from_wr_id(wr_id);
1395 ioctx = ch->ioctx_ring[index];
1396 state = srpt_get_cmd_state(ioctx);
1398 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
1399 && state != SRPT_STATE_MGMT_RSP_SENT
1400 && state != SRPT_STATE_NEED_DATA
1401 && state != SRPT_STATE_DONE);
1403 /* If SRP_RSP sending failed, undo the ch->req_lim change. */
1404 if (state == SRPT_STATE_CMD_RSP_SENT
1405 || state == SRPT_STATE_MGMT_RSP_SENT)
1406 atomic_dec(&ch->req_lim);
1408 srpt_abort_cmd(ioctx);
1412 * srpt_handle_send_comp() - Process an IB send completion notification.
1414 static void srpt_handle_send_comp(struct srpt_rdma_ch *ch,
1415 struct srpt_send_ioctx *ioctx)
1417 enum srpt_command_state state;
1419 atomic_inc(&ch->sq_wr_avail);
1421 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1423 if (WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
1424 && state != SRPT_STATE_MGMT_RSP_SENT
1425 && state != SRPT_STATE_DONE))
1426 pr_debug("state = %d\n", state);
1428 if (state != SRPT_STATE_DONE) {
1429 srpt_unmap_sg_to_ib_sge(ch, ioctx);
1430 transport_generic_free_cmd(&ioctx->cmd, 0);
1432 pr_err("IB completion has been received too late for"
1433 " wr_id = %u.\n", ioctx->ioctx.index);
1438 * srpt_handle_rdma_comp() - Process an IB RDMA completion notification.
1440 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1441 * the data that has been transferred via IB RDMA had to be postponed until the
1442 * check_stop_free() callback. None of this is necessary anymore and needs to
1445 static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch,
1446 struct srpt_send_ioctx *ioctx,
1447 enum srpt_opcode opcode)
1449 WARN_ON(ioctx->n_rdma <= 0);
1450 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1452 if (opcode == SRPT_RDMA_READ_LAST) {
1453 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1454 SRPT_STATE_DATA_IN))
1455 target_execute_cmd(&ioctx->cmd);
1457 pr_err("%s[%d]: wrong state = %d\n", __func__,
1458 __LINE__, srpt_get_cmd_state(ioctx));
1459 } else if (opcode == SRPT_RDMA_ABORT) {
1460 ioctx->rdma_aborted = true;
1462 WARN(true, "unexpected opcode %d\n", opcode);
1467 * srpt_handle_rdma_err_comp() - Process an IB RDMA error completion.
1469 static void srpt_handle_rdma_err_comp(struct srpt_rdma_ch *ch,
1470 struct srpt_send_ioctx *ioctx,
1471 enum srpt_opcode opcode)
1473 enum srpt_command_state state;
1475 state = srpt_get_cmd_state(ioctx);
1477 case SRPT_RDMA_READ_LAST:
1478 if (ioctx->n_rdma <= 0) {
1479 pr_err("Received invalid RDMA read"
1480 " error completion with idx %d\n",
1481 ioctx->ioctx.index);
1484 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1485 if (state == SRPT_STATE_NEED_DATA)
1486 srpt_abort_cmd(ioctx);
1488 pr_err("%s[%d]: wrong state = %d\n",
1489 __func__, __LINE__, state);
1491 case SRPT_RDMA_WRITE_LAST:
1494 pr_err("%s[%d]: opcode = %u\n", __func__, __LINE__, opcode);
1500 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1501 * @ch: RDMA channel through which the request has been received.
1502 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1503 * be built in the buffer ioctx->buf points at and hence this function will
1504 * overwrite the request data.
1505 * @tag: tag of the request for which this response is being generated.
1506 * @status: value for the STATUS field of the SRP_RSP information unit.
1508 * Returns the size in bytes of the SRP_RSP response.
1510 * An SRP_RSP response contains a SCSI status or service response. See also
1511 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1512 * response. See also SPC-2 for more information about sense data.
1514 static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1515 struct srpt_send_ioctx *ioctx, u64 tag,
1518 struct srp_rsp *srp_rsp;
1519 const u8 *sense_data;
1520 int sense_data_len, max_sense_len;
1523 * The lowest bit of all SAM-3 status codes is zero (see also
1524 * paragraph 5.3 in SAM-3).
1526 WARN_ON(status & 1);
1528 srp_rsp = ioctx->ioctx.buf;
1531 sense_data = ioctx->sense_data;
1532 sense_data_len = ioctx->cmd.scsi_sense_length;
1533 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1535 memset(srp_rsp, 0, sizeof *srp_rsp);
1536 srp_rsp->opcode = SRP_RSP;
1537 srp_rsp->req_lim_delta =
1538 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1540 srp_rsp->status = status;
1542 if (sense_data_len) {
1543 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1544 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1545 if (sense_data_len > max_sense_len) {
1546 pr_warn("truncated sense data from %d to %d"
1547 " bytes\n", sense_data_len, max_sense_len);
1548 sense_data_len = max_sense_len;
1551 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1552 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1553 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1556 return sizeof(*srp_rsp) + sense_data_len;
1560 * srpt_build_tskmgmt_rsp() - Build a task management response.
1561 * @ch: RDMA channel through which the request has been received.
1562 * @ioctx: I/O context in which the SRP_RSP response will be built.
1563 * @rsp_code: RSP_CODE that will be stored in the response.
1564 * @tag: Tag of the request for which this response is being generated.
1566 * Returns the size in bytes of the SRP_RSP response.
1568 * An SRP_RSP response contains a SCSI status or service response. See also
1569 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1572 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1573 struct srpt_send_ioctx *ioctx,
1574 u8 rsp_code, u64 tag)
1576 struct srp_rsp *srp_rsp;
1581 resp_len = sizeof(*srp_rsp) + resp_data_len;
1583 srp_rsp = ioctx->ioctx.buf;
1585 memset(srp_rsp, 0, sizeof *srp_rsp);
1587 srp_rsp->opcode = SRP_RSP;
1588 srp_rsp->req_lim_delta =
1589 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1592 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1593 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1594 srp_rsp->data[3] = rsp_code;
1599 #define NO_SUCH_LUN ((uint64_t)-1LL)
1602 * SCSI LUN addressing method. See also SAM-2 and the section about
1605 enum scsi_lun_addr_method {
1606 SCSI_LUN_ADDR_METHOD_PERIPHERAL = 0,
1607 SCSI_LUN_ADDR_METHOD_FLAT = 1,
1608 SCSI_LUN_ADDR_METHOD_LUN = 2,
1609 SCSI_LUN_ADDR_METHOD_EXTENDED_LUN = 3,
1613 * srpt_unpack_lun() - Convert from network LUN to linear LUN.
1615 * Convert an 2-byte, 4-byte, 6-byte or 8-byte LUN structure in network byte
1616 * order (big endian) to a linear LUN. Supports three LUN addressing methods:
1617 * peripheral, flat and logical unit. See also SAM-2, section 4.9.4 (page 40).
1619 static uint64_t srpt_unpack_lun(const uint8_t *lun, int len)
1621 uint64_t res = NO_SUCH_LUN;
1622 int addressing_method;
1624 if (unlikely(len < 2)) {
1625 pr_err("Illegal LUN length %d, expected 2 bytes or more\n",
1632 if ((*((__be64 *)lun) &
1633 cpu_to_be64(0x0000FFFFFFFFFFFFLL)) != 0)
1637 if (*((__be16 *)&lun[2]) != 0)
1641 if (*((__be32 *)&lun[2]) != 0)
1650 addressing_method = (*lun) >> 6; /* highest two bits of byte 0 */
1651 switch (addressing_method) {
1652 case SCSI_LUN_ADDR_METHOD_PERIPHERAL:
1653 case SCSI_LUN_ADDR_METHOD_FLAT:
1654 case SCSI_LUN_ADDR_METHOD_LUN:
1655 res = *(lun + 1) | (((*lun) & 0x3f) << 8);
1658 case SCSI_LUN_ADDR_METHOD_EXTENDED_LUN:
1660 pr_err("Unimplemented LUN addressing method %u\n",
1669 pr_err("Support for multi-level LUNs has not yet been implemented\n");
1673 static int srpt_check_stop_free(struct se_cmd *cmd)
1675 struct srpt_send_ioctx *ioctx = container_of(cmd,
1676 struct srpt_send_ioctx, cmd);
1678 return target_put_sess_cmd(&ioctx->cmd);
1682 * srpt_handle_cmd() - Process SRP_CMD.
1684 static int srpt_handle_cmd(struct srpt_rdma_ch *ch,
1685 struct srpt_recv_ioctx *recv_ioctx,
1686 struct srpt_send_ioctx *send_ioctx)
1689 struct srp_cmd *srp_cmd;
1690 uint64_t unpacked_lun;
1692 enum dma_data_direction dir;
1696 BUG_ON(!send_ioctx);
1698 srp_cmd = recv_ioctx->ioctx.buf;
1699 cmd = &send_ioctx->cmd;
1700 cmd->tag = srp_cmd->tag;
1702 switch (srp_cmd->task_attr) {
1703 case SRP_CMD_SIMPLE_Q:
1704 cmd->sam_task_attr = TCM_SIMPLE_TAG;
1706 case SRP_CMD_ORDERED_Q:
1708 cmd->sam_task_attr = TCM_ORDERED_TAG;
1710 case SRP_CMD_HEAD_OF_Q:
1711 cmd->sam_task_attr = TCM_HEAD_TAG;
1714 cmd->sam_task_attr = TCM_ACA_TAG;
1718 if (srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len)) {
1719 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1721 ret = TCM_INVALID_CDB_FIELD;
1725 unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_cmd->lun,
1726 sizeof(srp_cmd->lun));
1727 rc = target_submit_cmd(cmd, ch->sess, srp_cmd->cdb,
1728 &send_ioctx->sense_data[0], unpacked_lun, data_len,
1729 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF);
1731 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1737 transport_send_check_condition_and_sense(cmd, ret, 0);
1742 * srpt_rx_mgmt_fn_tag() - Process a task management function by tag.
1743 * @ch: RDMA channel of the task management request.
1744 * @fn: Task management function to perform.
1745 * @req_tag: Tag of the SRP task management request.
1746 * @mgmt_ioctx: I/O context of the task management request.
1748 * Returns zero if the target core will process the task management
1749 * request asynchronously.
1751 * Note: It is assumed that the initiator serializes tag-based task management
1754 static int srpt_rx_mgmt_fn_tag(struct srpt_send_ioctx *ioctx, u64 tag)
1756 struct srpt_device *sdev;
1757 struct srpt_rdma_ch *ch;
1758 struct srpt_send_ioctx *target;
1765 sdev = ch->sport->sdev;
1767 spin_lock_irq(&sdev->spinlock);
1768 for (i = 0; i < ch->rq_size; ++i) {
1769 target = ch->ioctx_ring[i];
1770 if (target->cmd.se_lun == ioctx->cmd.se_lun &&
1771 target->cmd.tag == tag &&
1772 srpt_get_cmd_state(target) != SRPT_STATE_DONE) {
1774 /* now let the target core abort &target->cmd; */
1778 spin_unlock_irq(&sdev->spinlock);
1782 static int srp_tmr_to_tcm(int fn)
1785 case SRP_TSK_ABORT_TASK:
1786 return TMR_ABORT_TASK;
1787 case SRP_TSK_ABORT_TASK_SET:
1788 return TMR_ABORT_TASK_SET;
1789 case SRP_TSK_CLEAR_TASK_SET:
1790 return TMR_CLEAR_TASK_SET;
1791 case SRP_TSK_LUN_RESET:
1792 return TMR_LUN_RESET;
1793 case SRP_TSK_CLEAR_ACA:
1794 return TMR_CLEAR_ACA;
1801 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1803 * Returns 0 if and only if the request will be processed by the target core.
1805 * For more information about SRP_TSK_MGMT information units, see also section
1806 * 6.7 in the SRP r16a document.
1808 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1809 struct srpt_recv_ioctx *recv_ioctx,
1810 struct srpt_send_ioctx *send_ioctx)
1812 struct srp_tsk_mgmt *srp_tsk;
1814 struct se_session *sess = ch->sess;
1815 uint64_t unpacked_lun;
1820 BUG_ON(!send_ioctx);
1822 srp_tsk = recv_ioctx->ioctx.buf;
1823 cmd = &send_ioctx->cmd;
1825 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1826 " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func,
1827 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
1829 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
1830 send_ioctx->cmd.tag = srp_tsk->tag;
1831 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
1833 send_ioctx->cmd.se_tmr_req->response =
1834 TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
1837 unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_tsk->lun,
1838 sizeof(srp_tsk->lun));
1840 if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK) {
1841 rc = srpt_rx_mgmt_fn_tag(send_ioctx, srp_tsk->task_tag);
1843 send_ioctx->cmd.se_tmr_req->response =
1844 TMR_TASK_DOES_NOT_EXIST;
1847 tag = srp_tsk->task_tag;
1849 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, unpacked_lun,
1850 srp_tsk, tcm_tmr, GFP_KERNEL, tag,
1851 TARGET_SCF_ACK_KREF);
1853 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
1858 transport_send_check_condition_and_sense(cmd, 0, 0); // XXX:
1862 * srpt_handle_new_iu() - Process a newly received information unit.
1863 * @ch: RDMA channel through which the information unit has been received.
1864 * @ioctx: SRPT I/O context associated with the information unit.
1866 static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
1867 struct srpt_recv_ioctx *recv_ioctx,
1868 struct srpt_send_ioctx *send_ioctx)
1870 struct srp_cmd *srp_cmd;
1871 enum rdma_ch_state ch_state;
1874 BUG_ON(!recv_ioctx);
1876 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1877 recv_ioctx->ioctx.dma, srp_max_req_size,
1880 ch_state = srpt_get_ch_state(ch);
1881 if (unlikely(ch_state == CH_CONNECTING)) {
1882 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1886 if (unlikely(ch_state != CH_LIVE))
1889 srp_cmd = recv_ioctx->ioctx.buf;
1890 if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
1892 send_ioctx = srpt_get_send_ioctx(ch);
1893 if (unlikely(!send_ioctx)) {
1894 list_add_tail(&recv_ioctx->wait_list,
1895 &ch->cmd_wait_list);
1900 switch (srp_cmd->opcode) {
1902 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1905 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1908 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1911 pr_debug("received SRP_CRED_RSP\n");
1914 pr_debug("received SRP_AER_RSP\n");
1917 pr_err("Received SRP_RSP\n");
1920 pr_err("received IU with unknown opcode 0x%x\n",
1925 srpt_post_recv(ch->sport->sdev, recv_ioctx);
1930 static void srpt_process_rcv_completion(struct ib_cq *cq,
1931 struct srpt_rdma_ch *ch,
1934 struct srpt_device *sdev = ch->sport->sdev;
1935 struct srpt_recv_ioctx *ioctx;
1938 index = idx_from_wr_id(wc->wr_id);
1939 if (wc->status == IB_WC_SUCCESS) {
1942 req_lim = atomic_dec_return(&ch->req_lim);
1943 if (unlikely(req_lim < 0))
1944 pr_err("req_lim = %d < 0\n", req_lim);
1945 ioctx = sdev->ioctx_ring[index];
1946 srpt_handle_new_iu(ch, ioctx, NULL);
1948 pr_info("receiving failed for idx %u with status %d\n",
1954 * srpt_process_send_completion() - Process an IB send completion.
1956 * Note: Although this has not yet been observed during tests, at least in
1957 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1958 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1959 * value in each response is set to one, and it is possible that this response
1960 * makes the initiator send a new request before the send completion for that
1961 * response has been processed. This could e.g. happen if the call to
1962 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1963 * if IB retransmission causes generation of the send completion to be
1964 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1965 * are queued on cmd_wait_list. The code below processes these delayed
1966 * requests one at a time.
1968 static void srpt_process_send_completion(struct ib_cq *cq,
1969 struct srpt_rdma_ch *ch,
1972 struct srpt_send_ioctx *send_ioctx;
1974 enum srpt_opcode opcode;
1976 index = idx_from_wr_id(wc->wr_id);
1977 opcode = opcode_from_wr_id(wc->wr_id);
1978 send_ioctx = ch->ioctx_ring[index];
1979 if (wc->status == IB_WC_SUCCESS) {
1980 if (opcode == SRPT_SEND)
1981 srpt_handle_send_comp(ch, send_ioctx);
1983 WARN_ON(opcode != SRPT_RDMA_ABORT &&
1984 wc->opcode != IB_WC_RDMA_READ);
1985 srpt_handle_rdma_comp(ch, send_ioctx, opcode);
1988 if (opcode == SRPT_SEND) {
1989 pr_info("sending response for idx %u failed"
1990 " with status %d\n", index, wc->status);
1991 srpt_handle_send_err_comp(ch, wc->wr_id);
1992 } else if (opcode != SRPT_RDMA_MID) {
1993 pr_info("RDMA t %d for idx %u failed with"
1994 " status %d\n", opcode, index, wc->status);
1995 srpt_handle_rdma_err_comp(ch, send_ioctx, opcode);
1999 while (unlikely(opcode == SRPT_SEND
2000 && !list_empty(&ch->cmd_wait_list)
2001 && srpt_get_ch_state(ch) == CH_LIVE
2002 && (send_ioctx = srpt_get_send_ioctx(ch)) != NULL)) {
2003 struct srpt_recv_ioctx *recv_ioctx;
2005 recv_ioctx = list_first_entry(&ch->cmd_wait_list,
2006 struct srpt_recv_ioctx,
2008 list_del(&recv_ioctx->wait_list);
2009 srpt_handle_new_iu(ch, recv_ioctx, send_ioctx);
2013 static void srpt_process_completion(struct ib_cq *cq, struct srpt_rdma_ch *ch)
2015 struct ib_wc *const wc = ch->wc;
2018 WARN_ON(cq != ch->cq);
2020 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
2021 while ((n = ib_poll_cq(cq, ARRAY_SIZE(ch->wc), wc)) > 0) {
2022 for (i = 0; i < n; i++) {
2023 if (opcode_from_wr_id(wc[i].wr_id) == SRPT_RECV)
2024 srpt_process_rcv_completion(cq, ch, &wc[i]);
2026 srpt_process_send_completion(cq, ch, &wc[i]);
2032 * srpt_completion() - IB completion queue callback function.
2035 * - It is guaranteed that a completion handler will never be invoked
2036 * concurrently on two different CPUs for the same completion queue. See also
2037 * Documentation/infiniband/core_locking.txt and the implementation of
2038 * handle_edge_irq() in kernel/irq/chip.c.
2039 * - When threaded IRQs are enabled, completion handlers are invoked in thread
2040 * context instead of interrupt context.
2042 static void srpt_completion(struct ib_cq *cq, void *ctx)
2044 struct srpt_rdma_ch *ch = ctx;
2046 wake_up_interruptible(&ch->wait_queue);
2049 static int srpt_compl_thread(void *arg)
2051 struct srpt_rdma_ch *ch;
2053 /* Hibernation / freezing of the SRPT kernel thread is not supported. */
2054 current->flags |= PF_NOFREEZE;
2058 pr_info("Session %s: kernel thread %s (PID %d) started\n",
2059 ch->sess_name, ch->thread->comm, current->pid);
2060 while (!kthread_should_stop()) {
2061 wait_event_interruptible(ch->wait_queue,
2062 (srpt_process_completion(ch->cq, ch),
2063 kthread_should_stop()));
2065 pr_info("Session %s: kernel thread %s (PID %d) stopped\n",
2066 ch->sess_name, ch->thread->comm, current->pid);
2071 * srpt_create_ch_ib() - Create receive and send completion queues.
2073 static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
2075 struct ib_qp_init_attr *qp_init;
2076 struct srpt_port *sport = ch->sport;
2077 struct srpt_device *sdev = sport->sdev;
2078 u32 srp_sq_size = sport->port_attrib.srp_sq_size;
2079 struct ib_cq_init_attr cq_attr = {};
2082 WARN_ON(ch->rq_size < 1);
2085 qp_init = kzalloc(sizeof *qp_init, GFP_KERNEL);
2090 cq_attr.cqe = ch->rq_size + srp_sq_size;
2091 ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch,
2093 if (IS_ERR(ch->cq)) {
2094 ret = PTR_ERR(ch->cq);
2095 pr_err("failed to create CQ cqe= %d ret= %d\n",
2096 ch->rq_size + srp_sq_size, ret);
2100 qp_init->qp_context = (void *)ch;
2101 qp_init->event_handler
2102 = (void(*)(struct ib_event *, void*))srpt_qp_event;
2103 qp_init->send_cq = ch->cq;
2104 qp_init->recv_cq = ch->cq;
2105 qp_init->srq = sdev->srq;
2106 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
2107 qp_init->qp_type = IB_QPT_RC;
2108 qp_init->cap.max_send_wr = srp_sq_size;
2109 qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE;
2111 ch->qp = ib_create_qp(sdev->pd, qp_init);
2112 if (IS_ERR(ch->qp)) {
2113 ret = PTR_ERR(ch->qp);
2114 if (ret == -ENOMEM) {
2116 if (srp_sq_size >= MIN_SRPT_SQ_SIZE) {
2117 ib_destroy_cq(ch->cq);
2121 pr_err("failed to create_qp ret= %d\n", ret);
2122 goto err_destroy_cq;
2125 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
2127 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
2128 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
2129 qp_init->cap.max_send_wr, ch->cm_id);
2131 ret = srpt_init_ch_qp(ch, ch->qp);
2133 goto err_destroy_qp;
2135 init_waitqueue_head(&ch->wait_queue);
2137 pr_debug("creating thread for session %s\n", ch->sess_name);
2139 ch->thread = kthread_run(srpt_compl_thread, ch, "ib_srpt_compl");
2140 if (IS_ERR(ch->thread)) {
2141 pr_err("failed to create kernel thread %ld\n",
2142 PTR_ERR(ch->thread));
2144 goto err_destroy_qp;
2152 ib_destroy_qp(ch->qp);
2154 ib_destroy_cq(ch->cq);
2158 static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
2161 kthread_stop(ch->thread);
2163 ib_destroy_qp(ch->qp);
2164 ib_destroy_cq(ch->cq);
2168 * __srpt_close_ch() - Close an RDMA channel by setting the QP error state.
2170 * Reset the QP and make sure all resources associated with the channel will
2171 * be deallocated at an appropriate time.
2173 * Note: The caller must hold ch->sport->sdev->spinlock.
2175 static void __srpt_close_ch(struct srpt_rdma_ch *ch)
2177 enum rdma_ch_state prev_state;
2178 unsigned long flags;
2180 spin_lock_irqsave(&ch->spinlock, flags);
2181 prev_state = ch->state;
2182 switch (prev_state) {
2185 ch->state = CH_DISCONNECTING;
2190 spin_unlock_irqrestore(&ch->spinlock, flags);
2192 switch (prev_state) {
2194 ib_send_cm_rej(ch->cm_id, IB_CM_REJ_NO_RESOURCES, NULL, 0,
2198 if (ib_send_cm_dreq(ch->cm_id, NULL, 0) < 0)
2199 pr_err("sending CM DREQ failed.\n");
2201 case CH_DISCONNECTING:
2210 * srpt_close_ch() - Close an RDMA channel.
2212 static void srpt_close_ch(struct srpt_rdma_ch *ch)
2214 struct srpt_device *sdev;
2216 sdev = ch->sport->sdev;
2217 spin_lock_irq(&sdev->spinlock);
2218 __srpt_close_ch(ch);
2219 spin_unlock_irq(&sdev->spinlock);
2223 * srpt_shutdown_session() - Whether or not a session may be shut down.
2225 static int srpt_shutdown_session(struct se_session *se_sess)
2227 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
2228 unsigned long flags;
2230 spin_lock_irqsave(&ch->spinlock, flags);
2231 if (ch->in_shutdown) {
2232 spin_unlock_irqrestore(&ch->spinlock, flags);
2236 ch->in_shutdown = true;
2237 target_sess_cmd_list_set_waiting(se_sess);
2238 spin_unlock_irqrestore(&ch->spinlock, flags);
2244 * srpt_drain_channel() - Drain a channel by resetting the IB queue pair.
2245 * @cm_id: Pointer to the CM ID of the channel to be drained.
2247 * Note: Must be called from inside srpt_cm_handler to avoid a race between
2248 * accessing sdev->spinlock and the call to kfree(sdev) in srpt_remove_one()
2249 * (the caller of srpt_cm_handler holds the cm_id spinlock; srpt_remove_one()
2250 * waits until all target sessions for the associated IB device have been
2251 * unregistered and target session registration involves a call to
2252 * ib_destroy_cm_id(), which locks the cm_id spinlock and hence waits until
2253 * this function has finished).
2255 static void srpt_drain_channel(struct ib_cm_id *cm_id)
2257 struct srpt_device *sdev;
2258 struct srpt_rdma_ch *ch;
2260 bool do_reset = false;
2262 WARN_ON_ONCE(irqs_disabled());
2264 sdev = cm_id->context;
2266 spin_lock_irq(&sdev->spinlock);
2267 list_for_each_entry(ch, &sdev->rch_list, list) {
2268 if (ch->cm_id == cm_id) {
2269 do_reset = srpt_test_and_set_ch_state(ch,
2270 CH_CONNECTING, CH_DRAINING) ||
2271 srpt_test_and_set_ch_state(ch,
2272 CH_LIVE, CH_DRAINING) ||
2273 srpt_test_and_set_ch_state(ch,
2274 CH_DISCONNECTING, CH_DRAINING);
2278 spin_unlock_irq(&sdev->spinlock);
2282 srpt_shutdown_session(ch->sess);
2284 ret = srpt_ch_qp_err(ch);
2286 pr_err("Setting queue pair in error state"
2287 " failed: %d\n", ret);
2292 * srpt_find_channel() - Look up an RDMA channel.
2293 * @cm_id: Pointer to the CM ID of the channel to be looked up.
2295 * Return NULL if no matching RDMA channel has been found.
2297 static struct srpt_rdma_ch *srpt_find_channel(struct srpt_device *sdev,
2298 struct ib_cm_id *cm_id)
2300 struct srpt_rdma_ch *ch;
2303 WARN_ON_ONCE(irqs_disabled());
2307 spin_lock_irq(&sdev->spinlock);
2308 list_for_each_entry(ch, &sdev->rch_list, list) {
2309 if (ch->cm_id == cm_id) {
2314 spin_unlock_irq(&sdev->spinlock);
2316 return found ? ch : NULL;
2320 * srpt_release_channel() - Release channel resources.
2322 * Schedules the actual release because:
2323 * - Calling the ib_destroy_cm_id() call from inside an IB CM callback would
2324 * trigger a deadlock.
2325 * - It is not safe to call TCM transport_* functions from interrupt context.
2327 static void srpt_release_channel(struct srpt_rdma_ch *ch)
2329 schedule_work(&ch->release_work);
2332 static void srpt_release_channel_work(struct work_struct *w)
2334 struct srpt_rdma_ch *ch;
2335 struct srpt_device *sdev;
2336 struct se_session *se_sess;
2338 ch = container_of(w, struct srpt_rdma_ch, release_work);
2339 pr_debug("ch = %p; ch->sess = %p; release_done = %p\n", ch, ch->sess,
2342 sdev = ch->sport->sdev;
2348 target_wait_for_sess_cmds(se_sess);
2350 transport_deregister_session_configfs(se_sess);
2351 transport_deregister_session(se_sess);
2354 ib_destroy_cm_id(ch->cm_id);
2356 srpt_destroy_ch_ib(ch);
2358 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2359 ch->sport->sdev, ch->rq_size,
2360 ch->rsp_size, DMA_TO_DEVICE);
2362 spin_lock_irq(&sdev->spinlock);
2363 list_del(&ch->list);
2364 spin_unlock_irq(&sdev->spinlock);
2366 if (ch->release_done)
2367 complete(ch->release_done);
2369 wake_up(&sdev->ch_releaseQ);
2374 static struct srpt_node_acl *__srpt_lookup_acl(struct srpt_port *sport,
2377 struct srpt_node_acl *nacl;
2379 list_for_each_entry(nacl, &sport->port_acl_list, list)
2380 if (memcmp(nacl->i_port_id, i_port_id,
2381 sizeof(nacl->i_port_id)) == 0)
2387 static struct srpt_node_acl *srpt_lookup_acl(struct srpt_port *sport,
2390 struct srpt_node_acl *nacl;
2392 spin_lock_irq(&sport->port_acl_lock);
2393 nacl = __srpt_lookup_acl(sport, i_port_id);
2394 spin_unlock_irq(&sport->port_acl_lock);
2400 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
2402 * Ownership of the cm_id is transferred to the target session if this
2403 * functions returns zero. Otherwise the caller remains the owner of cm_id.
2405 static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
2406 struct ib_cm_req_event_param *param,
2409 struct srpt_device *sdev = cm_id->context;
2410 struct srpt_port *sport = &sdev->port[param->port - 1];
2411 struct srp_login_req *req;
2412 struct srp_login_rsp *rsp;
2413 struct srp_login_rej *rej;
2414 struct ib_cm_rep_param *rep_param;
2415 struct srpt_rdma_ch *ch, *tmp_ch;
2416 struct srpt_node_acl *nacl;
2421 WARN_ON_ONCE(irqs_disabled());
2423 if (WARN_ON(!sdev || !private_data))
2426 req = (struct srp_login_req *)private_data;
2428 it_iu_len = be32_to_cpu(req->req_it_iu_len);
2430 pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
2431 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
2432 " (guid=0x%llx:0x%llx)\n",
2433 be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
2434 be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
2435 be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
2436 be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
2439 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
2440 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
2442 rsp = kzalloc(sizeof *rsp, GFP_KERNEL);
2443 rej = kzalloc(sizeof *rej, GFP_KERNEL);
2444 rep_param = kzalloc(sizeof *rep_param, GFP_KERNEL);
2446 if (!rsp || !rej || !rep_param) {
2451 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
2452 rej->reason = cpu_to_be32(
2453 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
2455 pr_err("rejected SRP_LOGIN_REQ because its"
2456 " length (%d bytes) is out of range (%d .. %d)\n",
2457 it_iu_len, 64, srp_max_req_size);
2461 if (!sport->enabled) {
2462 rej->reason = cpu_to_be32(
2463 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2465 pr_err("rejected SRP_LOGIN_REQ because the target port"
2466 " has not yet been enabled\n");
2470 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
2471 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
2473 spin_lock_irq(&sdev->spinlock);
2475 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
2476 if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
2477 && !memcmp(ch->t_port_id, req->target_port_id, 16)
2478 && param->port == ch->sport->port
2479 && param->listen_id == ch->sport->sdev->cm_id
2481 enum rdma_ch_state ch_state;
2483 ch_state = srpt_get_ch_state(ch);
2484 if (ch_state != CH_CONNECTING
2485 && ch_state != CH_LIVE)
2488 /* found an existing channel */
2489 pr_debug("Found existing channel %s"
2490 " cm_id= %p state= %d\n",
2491 ch->sess_name, ch->cm_id, ch_state);
2493 __srpt_close_ch(ch);
2496 SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
2500 spin_unlock_irq(&sdev->spinlock);
2503 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
2505 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
2506 || *(__be64 *)(req->target_port_id + 8) !=
2507 cpu_to_be64(srpt_service_guid)) {
2508 rej->reason = cpu_to_be32(
2509 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
2511 pr_err("rejected SRP_LOGIN_REQ because it"
2512 " has an invalid target port identifier.\n");
2516 ch = kzalloc(sizeof *ch, GFP_KERNEL);
2518 rej->reason = cpu_to_be32(
2519 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2520 pr_err("rejected SRP_LOGIN_REQ because no memory.\n");
2525 INIT_WORK(&ch->release_work, srpt_release_channel_work);
2526 memcpy(ch->i_port_id, req->initiator_port_id, 16);
2527 memcpy(ch->t_port_id, req->target_port_id, 16);
2528 ch->sport = &sdev->port[param->port - 1];
2531 * Avoid QUEUE_FULL conditions by limiting the number of buffers used
2532 * for the SRP protocol to the command queue size.
2534 ch->rq_size = SRPT_RQ_SIZE;
2535 spin_lock_init(&ch->spinlock);
2536 ch->state = CH_CONNECTING;
2537 INIT_LIST_HEAD(&ch->cmd_wait_list);
2538 ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
2540 ch->ioctx_ring = (struct srpt_send_ioctx **)
2541 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2542 sizeof(*ch->ioctx_ring[0]),
2543 ch->rsp_size, DMA_TO_DEVICE);
2544 if (!ch->ioctx_ring)
2547 INIT_LIST_HEAD(&ch->free_list);
2548 for (i = 0; i < ch->rq_size; i++) {
2549 ch->ioctx_ring[i]->ch = ch;
2550 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
2553 ret = srpt_create_ch_ib(ch);
2555 rej->reason = cpu_to_be32(
2556 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2557 pr_err("rejected SRP_LOGIN_REQ because creating"
2558 " a new RDMA channel failed.\n");
2562 ret = srpt_ch_qp_rtr(ch, ch->qp);
2564 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2565 pr_err("rejected SRP_LOGIN_REQ because enabling"
2566 " RTR failed (error code = %d)\n", ret);
2570 * Use the initator port identifier as the session name.
2572 snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx",
2573 be64_to_cpu(*(__be64 *)ch->i_port_id),
2574 be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
2576 pr_debug("registering session %s\n", ch->sess_name);
2578 nacl = srpt_lookup_acl(sport, ch->i_port_id);
2580 pr_info("Rejected login because no ACL has been"
2581 " configured yet for initiator %s.\n", ch->sess_name);
2582 rej->reason = cpu_to_be32(
2583 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2587 ch->sess = transport_init_session(TARGET_PROT_NORMAL);
2588 if (IS_ERR(ch->sess)) {
2589 rej->reason = cpu_to_be32(
2590 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2591 pr_debug("Failed to create session\n");
2592 goto deregister_session;
2594 ch->sess->se_node_acl = &nacl->nacl;
2595 transport_register_session(&sport->port_tpg_1, &nacl->nacl, ch->sess, ch);
2597 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess,
2598 ch->sess_name, ch->cm_id);
2600 /* create srp_login_response */
2601 rsp->opcode = SRP_LOGIN_RSP;
2602 rsp->tag = req->tag;
2603 rsp->max_it_iu_len = req->req_it_iu_len;
2604 rsp->max_ti_iu_len = req->req_it_iu_len;
2605 ch->max_ti_iu_len = it_iu_len;
2606 rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2607 | SRP_BUF_FORMAT_INDIRECT);
2608 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2609 atomic_set(&ch->req_lim, ch->rq_size);
2610 atomic_set(&ch->req_lim_delta, 0);
2612 /* create cm reply */
2613 rep_param->qp_num = ch->qp->qp_num;
2614 rep_param->private_data = (void *)rsp;
2615 rep_param->private_data_len = sizeof *rsp;
2616 rep_param->rnr_retry_count = 7;
2617 rep_param->flow_control = 1;
2618 rep_param->failover_accepted = 0;
2620 rep_param->responder_resources = 4;
2621 rep_param->initiator_depth = 4;
2623 ret = ib_send_cm_rep(cm_id, rep_param);
2625 pr_err("sending SRP_LOGIN_REQ response failed"
2626 " (error code = %d)\n", ret);
2627 goto release_channel;
2630 spin_lock_irq(&sdev->spinlock);
2631 list_add_tail(&ch->list, &sdev->rch_list);
2632 spin_unlock_irq(&sdev->spinlock);
2637 srpt_set_ch_state(ch, CH_RELEASING);
2638 transport_deregister_session_configfs(ch->sess);
2641 transport_deregister_session(ch->sess);
2645 srpt_destroy_ch_ib(ch);
2648 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2649 ch->sport->sdev, ch->rq_size,
2650 ch->rsp_size, DMA_TO_DEVICE);
2655 rej->opcode = SRP_LOGIN_REJ;
2656 rej->tag = req->tag;
2657 rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2658 | SRP_BUF_FORMAT_INDIRECT);
2660 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2661 (void *)rej, sizeof *rej);
2671 static void srpt_cm_rej_recv(struct ib_cm_id *cm_id)
2673 pr_info("Received IB REJ for cm_id %p.\n", cm_id);
2674 srpt_drain_channel(cm_id);
2678 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2680 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2681 * and that the recipient may begin transmitting (RTU = ready to use).
2683 static void srpt_cm_rtu_recv(struct ib_cm_id *cm_id)
2685 struct srpt_rdma_ch *ch;
2688 ch = srpt_find_channel(cm_id->context, cm_id);
2691 if (srpt_test_and_set_ch_state(ch, CH_CONNECTING, CH_LIVE)) {
2692 struct srpt_recv_ioctx *ioctx, *ioctx_tmp;
2694 ret = srpt_ch_qp_rts(ch, ch->qp);
2696 list_for_each_entry_safe(ioctx, ioctx_tmp, &ch->cmd_wait_list,
2698 list_del(&ioctx->wait_list);
2699 srpt_handle_new_iu(ch, ioctx, NULL);
2706 static void srpt_cm_timewait_exit(struct ib_cm_id *cm_id)
2708 pr_info("Received IB TimeWait exit for cm_id %p.\n", cm_id);
2709 srpt_drain_channel(cm_id);
2712 static void srpt_cm_rep_error(struct ib_cm_id *cm_id)
2714 pr_info("Received IB REP error for cm_id %p.\n", cm_id);
2715 srpt_drain_channel(cm_id);
2719 * srpt_cm_dreq_recv() - Process reception of a DREQ message.
2721 static void srpt_cm_dreq_recv(struct ib_cm_id *cm_id)
2723 struct srpt_rdma_ch *ch;
2724 unsigned long flags;
2725 bool send_drep = false;
2727 ch = srpt_find_channel(cm_id->context, cm_id);
2730 pr_debug("cm_id= %p ch->state= %d\n", cm_id, srpt_get_ch_state(ch));
2732 spin_lock_irqsave(&ch->spinlock, flags);
2733 switch (ch->state) {
2737 ch->state = CH_DISCONNECTING;
2739 case CH_DISCONNECTING:
2742 WARN(true, "unexpected channel state %d\n", ch->state);
2745 spin_unlock_irqrestore(&ch->spinlock, flags);
2748 if (ib_send_cm_drep(ch->cm_id, NULL, 0) < 0)
2749 pr_err("Sending IB DREP failed.\n");
2750 pr_info("Received DREQ and sent DREP for session %s.\n",
2756 * srpt_cm_drep_recv() - Process reception of a DREP message.
2758 static void srpt_cm_drep_recv(struct ib_cm_id *cm_id)
2760 pr_info("Received InfiniBand DREP message for cm_id %p.\n", cm_id);
2761 srpt_drain_channel(cm_id);
2765 * srpt_cm_handler() - IB connection manager callback function.
2767 * A non-zero return value will cause the caller destroy the CM ID.
2769 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2770 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2771 * a non-zero value in any other case will trigger a race with the
2772 * ib_destroy_cm_id() call in srpt_release_channel().
2774 static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2779 switch (event->event) {
2780 case IB_CM_REQ_RECEIVED:
2781 ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
2782 event->private_data);
2784 case IB_CM_REJ_RECEIVED:
2785 srpt_cm_rej_recv(cm_id);
2787 case IB_CM_RTU_RECEIVED:
2788 case IB_CM_USER_ESTABLISHED:
2789 srpt_cm_rtu_recv(cm_id);
2791 case IB_CM_DREQ_RECEIVED:
2792 srpt_cm_dreq_recv(cm_id);
2794 case IB_CM_DREP_RECEIVED:
2795 srpt_cm_drep_recv(cm_id);
2797 case IB_CM_TIMEWAIT_EXIT:
2798 srpt_cm_timewait_exit(cm_id);
2800 case IB_CM_REP_ERROR:
2801 srpt_cm_rep_error(cm_id);
2803 case IB_CM_DREQ_ERROR:
2804 pr_info("Received IB DREQ ERROR event.\n");
2806 case IB_CM_MRA_RECEIVED:
2807 pr_info("Received IB MRA event\n");
2810 pr_err("received unrecognized IB CM event %d\n", event->event);
2818 * srpt_perform_rdmas() - Perform IB RDMA.
2820 * Returns zero upon success or a negative number upon failure.
2822 static int srpt_perform_rdmas(struct srpt_rdma_ch *ch,
2823 struct srpt_send_ioctx *ioctx)
2825 struct ib_send_wr wr;
2826 struct ib_send_wr *bad_wr;
2827 struct rdma_iu *riu;
2831 enum dma_data_direction dir;
2832 const int n_rdma = ioctx->n_rdma;
2834 dir = ioctx->cmd.data_direction;
2835 if (dir == DMA_TO_DEVICE) {
2838 sq_wr_avail = atomic_sub_return(n_rdma, &ch->sq_wr_avail);
2839 if (sq_wr_avail < 0) {
2840 pr_warn("IB send queue full (needed %d)\n",
2846 ioctx->rdma_aborted = false;
2848 riu = ioctx->rdma_ius;
2849 memset(&wr, 0, sizeof wr);
2851 for (i = 0; i < n_rdma; ++i, ++riu) {
2852 if (dir == DMA_FROM_DEVICE) {
2853 wr.opcode = IB_WR_RDMA_WRITE;
2854 wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
2855 SRPT_RDMA_WRITE_LAST :
2857 ioctx->ioctx.index);
2859 wr.opcode = IB_WR_RDMA_READ;
2860 wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
2861 SRPT_RDMA_READ_LAST :
2863 ioctx->ioctx.index);
2866 wr.wr.rdma.remote_addr = riu->raddr;
2867 wr.wr.rdma.rkey = riu->rkey;
2868 wr.num_sge = riu->sge_cnt;
2869 wr.sg_list = riu->sge;
2871 /* only get completion event for the last rdma write */
2872 if (i == (n_rdma - 1) && dir == DMA_TO_DEVICE)
2873 wr.send_flags = IB_SEND_SIGNALED;
2875 ret = ib_post_send(ch->qp, &wr, &bad_wr);
2881 pr_err("%s[%d]: ib_post_send() returned %d for %d/%d\n",
2882 __func__, __LINE__, ret, i, n_rdma);
2885 wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index);
2886 wr.send_flags = IB_SEND_SIGNALED;
2887 while (ch->state == CH_LIVE &&
2888 ib_post_send(ch->qp, &wr, &bad_wr) != 0) {
2889 pr_info("Trying to abort failed RDMA transfer [%d]\n",
2890 ioctx->ioctx.index);
2893 while (ch->state != CH_RELEASING && !ioctx->rdma_aborted) {
2894 pr_info("Waiting until RDMA abort finished [%d]\n",
2895 ioctx->ioctx.index);
2900 if (unlikely(dir == DMA_TO_DEVICE && ret < 0))
2901 atomic_add(n_rdma, &ch->sq_wr_avail);
2906 * srpt_xfer_data() - Start data transfer from initiator to target.
2908 static int srpt_xfer_data(struct srpt_rdma_ch *ch,
2909 struct srpt_send_ioctx *ioctx)
2913 ret = srpt_map_sg_to_ib_sge(ch, ioctx);
2915 pr_err("%s[%d] ret=%d\n", __func__, __LINE__, ret);
2919 ret = srpt_perform_rdmas(ch, ioctx);
2921 if (ret == -EAGAIN || ret == -ENOMEM)
2922 pr_info("%s[%d] queue full -- ret=%d\n",
2923 __func__, __LINE__, ret);
2925 pr_err("%s[%d] fatal error -- ret=%d\n",
2926 __func__, __LINE__, ret);
2933 srpt_unmap_sg_to_ib_sge(ch, ioctx);
2937 static int srpt_write_pending_status(struct se_cmd *se_cmd)
2939 struct srpt_send_ioctx *ioctx;
2941 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2942 return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA;
2946 * srpt_write_pending() - Start data transfer from initiator to target (write).
2948 static int srpt_write_pending(struct se_cmd *se_cmd)
2950 struct srpt_rdma_ch *ch;
2951 struct srpt_send_ioctx *ioctx;
2952 enum srpt_command_state new_state;
2953 enum rdma_ch_state ch_state;
2956 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2958 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2959 WARN_ON(new_state == SRPT_STATE_DONE);
2964 ch_state = srpt_get_ch_state(ch);
2967 WARN(true, "unexpected channel state %d\n", ch_state);
2972 case CH_DISCONNECTING:
2975 pr_debug("cmd with tag %lld: channel disconnecting\n",
2977 srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
2981 ret = srpt_xfer_data(ch, ioctx);
2987 static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2989 switch (tcm_mgmt_status) {
2990 case TMR_FUNCTION_COMPLETE:
2991 return SRP_TSK_MGMT_SUCCESS;
2992 case TMR_FUNCTION_REJECTED:
2993 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
2995 return SRP_TSK_MGMT_FAILED;
2999 * srpt_queue_response() - Transmits the response to a SCSI command.
3001 * Callback function called by the TCM core. Must not block since it can be
3002 * invoked on the context of the IB completion handler.
3004 static void srpt_queue_response(struct se_cmd *cmd)
3006 struct srpt_rdma_ch *ch;
3007 struct srpt_send_ioctx *ioctx;
3008 enum srpt_command_state state;
3009 unsigned long flags;
3011 enum dma_data_direction dir;
3015 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
3019 spin_lock_irqsave(&ioctx->spinlock, flags);
3020 state = ioctx->state;
3022 case SRPT_STATE_NEW:
3023 case SRPT_STATE_DATA_IN:
3024 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
3026 case SRPT_STATE_MGMT:
3027 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
3030 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
3031 ch, ioctx->ioctx.index, ioctx->state);
3034 spin_unlock_irqrestore(&ioctx->spinlock, flags);
3036 if (unlikely(transport_check_aborted_status(&ioctx->cmd, false)
3037 || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) {
3038 atomic_inc(&ch->req_lim_delta);
3039 srpt_abort_cmd(ioctx);
3043 dir = ioctx->cmd.data_direction;
3045 /* For read commands, transfer the data to the initiator. */
3046 if (dir == DMA_FROM_DEVICE && ioctx->cmd.data_length &&
3047 !ioctx->queue_status_only) {
3048 ret = srpt_xfer_data(ch, ioctx);
3050 pr_err("xfer_data failed for tag %llu\n",
3056 if (state != SRPT_STATE_MGMT)
3057 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
3061 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
3062 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
3065 ret = srpt_post_send(ch, ioctx, resp_len);
3067 pr_err("sending cmd response failed for tag %llu\n",
3069 srpt_unmap_sg_to_ib_sge(ch, ioctx);
3070 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
3071 target_put_sess_cmd(&ioctx->cmd);
3075 static int srpt_queue_data_in(struct se_cmd *cmd)
3077 srpt_queue_response(cmd);
3081 static void srpt_queue_tm_rsp(struct se_cmd *cmd)
3083 srpt_queue_response(cmd);
3086 static void srpt_aborted_task(struct se_cmd *cmd)
3088 struct srpt_send_ioctx *ioctx = container_of(cmd,
3089 struct srpt_send_ioctx, cmd);
3091 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
3094 static int srpt_queue_status(struct se_cmd *cmd)
3096 struct srpt_send_ioctx *ioctx;
3098 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
3099 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
3100 if (cmd->se_cmd_flags &
3101 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
3102 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
3103 ioctx->queue_status_only = true;
3104 srpt_queue_response(cmd);
3108 static void srpt_refresh_port_work(struct work_struct *work)
3110 struct srpt_port *sport = container_of(work, struct srpt_port, work);
3112 srpt_refresh_port(sport);
3115 static int srpt_ch_list_empty(struct srpt_device *sdev)
3119 spin_lock_irq(&sdev->spinlock);
3120 res = list_empty(&sdev->rch_list);
3121 spin_unlock_irq(&sdev->spinlock);
3127 * srpt_release_sdev() - Free the channel resources associated with a target.
3129 static int srpt_release_sdev(struct srpt_device *sdev)
3131 struct srpt_rdma_ch *ch, *tmp_ch;
3134 WARN_ON_ONCE(irqs_disabled());
3138 spin_lock_irq(&sdev->spinlock);
3139 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list)
3140 __srpt_close_ch(ch);
3141 spin_unlock_irq(&sdev->spinlock);
3143 res = wait_event_interruptible(sdev->ch_releaseQ,
3144 srpt_ch_list_empty(sdev));
3146 pr_err("%s: interrupted.\n", __func__);
3151 static struct srpt_port *__srpt_lookup_port(const char *name)
3153 struct ib_device *dev;
3154 struct srpt_device *sdev;
3155 struct srpt_port *sport;
3158 list_for_each_entry(sdev, &srpt_dev_list, list) {
3163 for (i = 0; i < dev->phys_port_cnt; i++) {
3164 sport = &sdev->port[i];
3166 if (!strcmp(sport->port_guid, name))
3174 static struct srpt_port *srpt_lookup_port(const char *name)
3176 struct srpt_port *sport;
3178 spin_lock(&srpt_dev_lock);
3179 sport = __srpt_lookup_port(name);
3180 spin_unlock(&srpt_dev_lock);
3186 * srpt_add_one() - Infiniband device addition callback function.
3188 static void srpt_add_one(struct ib_device *device)
3190 struct srpt_device *sdev;
3191 struct srpt_port *sport;
3192 struct ib_srq_init_attr srq_attr;
3195 pr_debug("device = %p, device->dma_ops = %p\n", device,
3198 sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
3202 sdev->device = device;
3203 INIT_LIST_HEAD(&sdev->rch_list);
3204 init_waitqueue_head(&sdev->ch_releaseQ);
3205 spin_lock_init(&sdev->spinlock);
3207 if (ib_query_device(device, &sdev->dev_attr))
3210 sdev->pd = ib_alloc_pd(device);
3211 if (IS_ERR(sdev->pd))
3214 sdev->mr = ib_get_dma_mr(sdev->pd, IB_ACCESS_LOCAL_WRITE);
3215 if (IS_ERR(sdev->mr))
3218 sdev->srq_size = min(srpt_srq_size, sdev->dev_attr.max_srq_wr);
3220 srq_attr.event_handler = srpt_srq_event;
3221 srq_attr.srq_context = (void *)sdev;
3222 srq_attr.attr.max_wr = sdev->srq_size;
3223 srq_attr.attr.max_sge = 1;
3224 srq_attr.attr.srq_limit = 0;
3225 srq_attr.srq_type = IB_SRQT_BASIC;
3227 sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
3228 if (IS_ERR(sdev->srq))
3231 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
3232 __func__, sdev->srq_size, sdev->dev_attr.max_srq_wr,
3235 if (!srpt_service_guid)
3236 srpt_service_guid = be64_to_cpu(device->node_guid);
3238 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
3239 if (IS_ERR(sdev->cm_id))
3242 /* print out target login information */
3243 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
3244 "pkey=ffff,service_id=%016llx\n", srpt_service_guid,
3245 srpt_service_guid, srpt_service_guid);
3248 * We do not have a consistent service_id (ie. also id_ext of target_id)
3249 * to identify this target. We currently use the guid of the first HCA
3250 * in the system as service_id; therefore, the target_id will change
3251 * if this HCA is gone bad and replaced by different HCA
3253 if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0, NULL))
3256 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
3257 srpt_event_handler);
3258 if (ib_register_event_handler(&sdev->event_handler))
3261 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
3262 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
3263 sizeof(*sdev->ioctx_ring[0]),
3264 srp_max_req_size, DMA_FROM_DEVICE);
3265 if (!sdev->ioctx_ring)
3268 for (i = 0; i < sdev->srq_size; ++i)
3269 srpt_post_recv(sdev, sdev->ioctx_ring[i]);
3271 WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
3273 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
3274 sport = &sdev->port[i - 1];
3277 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
3278 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
3279 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
3280 INIT_WORK(&sport->work, srpt_refresh_port_work);
3281 INIT_LIST_HEAD(&sport->port_acl_list);
3282 spin_lock_init(&sport->port_acl_lock);
3284 if (srpt_refresh_port(sport)) {
3285 pr_err("MAD registration failed for %s-%d.\n",
3286 srpt_sdev_name(sdev), i);
3289 snprintf(sport->port_guid, sizeof(sport->port_guid),
3291 be64_to_cpu(sport->gid.global.subnet_prefix),
3292 be64_to_cpu(sport->gid.global.interface_id));
3295 spin_lock(&srpt_dev_lock);
3296 list_add_tail(&sdev->list, &srpt_dev_list);
3297 spin_unlock(&srpt_dev_lock);
3300 ib_set_client_data(device, &srpt_client, sdev);
3301 pr_debug("added %s.\n", device->name);
3305 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3306 sdev->srq_size, srp_max_req_size,
3309 ib_unregister_event_handler(&sdev->event_handler);
3311 ib_destroy_cm_id(sdev->cm_id);
3313 ib_destroy_srq(sdev->srq);
3315 ib_dereg_mr(sdev->mr);
3317 ib_dealloc_pd(sdev->pd);
3322 pr_info("%s(%s) failed.\n", __func__, device->name);
3327 * srpt_remove_one() - InfiniBand device removal callback function.
3329 static void srpt_remove_one(struct ib_device *device)
3331 struct srpt_device *sdev;
3334 sdev = ib_get_client_data(device, &srpt_client);
3336 pr_info("%s(%s): nothing to do.\n", __func__, device->name);
3340 srpt_unregister_mad_agent(sdev);
3342 ib_unregister_event_handler(&sdev->event_handler);
3344 /* Cancel any work queued by the just unregistered IB event handler. */
3345 for (i = 0; i < sdev->device->phys_port_cnt; i++)
3346 cancel_work_sync(&sdev->port[i].work);
3348 ib_destroy_cm_id(sdev->cm_id);
3351 * Unregistering a target must happen after destroying sdev->cm_id
3352 * such that no new SRP_LOGIN_REQ information units can arrive while
3353 * destroying the target.
3355 spin_lock(&srpt_dev_lock);
3356 list_del(&sdev->list);
3357 spin_unlock(&srpt_dev_lock);
3358 srpt_release_sdev(sdev);
3360 ib_destroy_srq(sdev->srq);
3361 ib_dereg_mr(sdev->mr);
3362 ib_dealloc_pd(sdev->pd);
3364 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3365 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
3366 sdev->ioctx_ring = NULL;
3370 static struct ib_client srpt_client = {
3372 .add = srpt_add_one,
3373 .remove = srpt_remove_one
3376 static int srpt_check_true(struct se_portal_group *se_tpg)
3381 static int srpt_check_false(struct se_portal_group *se_tpg)
3386 static char *srpt_get_fabric_name(void)
3391 static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
3393 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
3395 return sport->port_guid;
3398 static u16 srpt_get_tag(struct se_portal_group *tpg)
3403 static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
3408 static void srpt_release_cmd(struct se_cmd *se_cmd)
3410 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
3411 struct srpt_send_ioctx, cmd);
3412 struct srpt_rdma_ch *ch = ioctx->ch;
3413 unsigned long flags;
3415 WARN_ON(ioctx->state != SRPT_STATE_DONE);
3416 WARN_ON(ioctx->mapped_sg_count != 0);
3418 if (ioctx->n_rbuf > 1) {
3419 kfree(ioctx->rbufs);
3420 ioctx->rbufs = NULL;
3424 spin_lock_irqsave(&ch->spinlock, flags);
3425 list_add(&ioctx->free_list, &ch->free_list);
3426 spin_unlock_irqrestore(&ch->spinlock, flags);
3430 * srpt_close_session() - Forcibly close a session.
3432 * Callback function invoked by the TCM core to clean up sessions associated
3433 * with a node ACL when the user invokes
3434 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3436 static void srpt_close_session(struct se_session *se_sess)
3438 DECLARE_COMPLETION_ONSTACK(release_done);
3439 struct srpt_rdma_ch *ch;
3440 struct srpt_device *sdev;
3443 ch = se_sess->fabric_sess_ptr;
3444 WARN_ON(ch->sess != se_sess);
3446 pr_debug("ch %p state %d\n", ch, srpt_get_ch_state(ch));
3448 sdev = ch->sport->sdev;
3449 spin_lock_irq(&sdev->spinlock);
3450 BUG_ON(ch->release_done);
3451 ch->release_done = &release_done;
3452 __srpt_close_ch(ch);
3453 spin_unlock_irq(&sdev->spinlock);
3455 res = wait_for_completion_timeout(&release_done, 60 * HZ);
3460 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
3462 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
3463 * This object represents an arbitrary integer used to uniquely identify a
3464 * particular attached remote initiator port to a particular SCSI target port
3465 * within a particular SCSI target device within a particular SCSI instance.
3467 static u32 srpt_sess_get_index(struct se_session *se_sess)
3472 static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
3476 /* Note: only used from inside debug printk's by the TCM core. */
3477 static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
3479 struct srpt_send_ioctx *ioctx;
3481 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3482 return srpt_get_cmd_state(ioctx);
3486 * srpt_parse_i_port_id() - Parse an initiator port ID.
3487 * @name: ASCII representation of a 128-bit initiator port ID.
3488 * @i_port_id: Binary 128-bit port ID.
3490 static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
3493 unsigned len, count, leading_zero_bytes;
3497 if (strncasecmp(p, "0x", 2) == 0)
3503 count = min(len / 2, 16U);
3504 leading_zero_bytes = 16 - count;
3505 memset(i_port_id, 0, leading_zero_bytes);
3506 rc = hex2bin(i_port_id + leading_zero_bytes, p, count);
3508 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc);
3515 * configfs callback function invoked for
3516 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3518 static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
3520 struct srpt_port *sport =
3521 container_of(se_nacl->se_tpg, struct srpt_port, port_tpg_1);
3522 struct srpt_node_acl *nacl =
3523 container_of(se_nacl, struct srpt_node_acl, nacl);
3526 if (srpt_parse_i_port_id(i_port_id, name) < 0) {
3527 pr_err("invalid initiator port ID %s\n", name);
3531 memcpy(&nacl->i_port_id[0], &i_port_id[0], 16);
3532 nacl->sport = sport;
3534 spin_lock_irq(&sport->port_acl_lock);
3535 list_add_tail(&nacl->list, &sport->port_acl_list);
3536 spin_unlock_irq(&sport->port_acl_lock);
3542 * configfs callback function invoked for
3543 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3545 static void srpt_cleanup_nodeacl(struct se_node_acl *se_nacl)
3547 struct srpt_node_acl *nacl =
3548 container_of(se_nacl, struct srpt_node_acl, nacl);
3549 struct srpt_port *sport = nacl->sport;
3551 spin_lock_irq(&sport->port_acl_lock);
3552 list_del(&nacl->list);
3553 spin_unlock_irq(&sport->port_acl_lock);
3556 static ssize_t srpt_tpg_attrib_show_srp_max_rdma_size(
3557 struct se_portal_group *se_tpg,
3560 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3562 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
3565 static ssize_t srpt_tpg_attrib_store_srp_max_rdma_size(
3566 struct se_portal_group *se_tpg,
3570 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3574 ret = kstrtoul(page, 0, &val);
3576 pr_err("kstrtoul() failed with ret: %d\n", ret);
3579 if (val > MAX_SRPT_RDMA_SIZE) {
3580 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
3581 MAX_SRPT_RDMA_SIZE);
3584 if (val < DEFAULT_MAX_RDMA_SIZE) {
3585 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
3586 val, DEFAULT_MAX_RDMA_SIZE);
3589 sport->port_attrib.srp_max_rdma_size = val;
3594 TF_TPG_ATTRIB_ATTR(srpt, srp_max_rdma_size, S_IRUGO | S_IWUSR);
3596 static ssize_t srpt_tpg_attrib_show_srp_max_rsp_size(
3597 struct se_portal_group *se_tpg,
3600 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3602 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
3605 static ssize_t srpt_tpg_attrib_store_srp_max_rsp_size(
3606 struct se_portal_group *se_tpg,
3610 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3614 ret = kstrtoul(page, 0, &val);
3616 pr_err("kstrtoul() failed with ret: %d\n", ret);
3619 if (val > MAX_SRPT_RSP_SIZE) {
3620 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
3624 if (val < MIN_MAX_RSP_SIZE) {
3625 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
3629 sport->port_attrib.srp_max_rsp_size = val;
3634 TF_TPG_ATTRIB_ATTR(srpt, srp_max_rsp_size, S_IRUGO | S_IWUSR);
3636 static ssize_t srpt_tpg_attrib_show_srp_sq_size(
3637 struct se_portal_group *se_tpg,
3640 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3642 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
3645 static ssize_t srpt_tpg_attrib_store_srp_sq_size(
3646 struct se_portal_group *se_tpg,
3650 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3654 ret = kstrtoul(page, 0, &val);
3656 pr_err("kstrtoul() failed with ret: %d\n", ret);
3659 if (val > MAX_SRPT_SRQ_SIZE) {
3660 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
3664 if (val < MIN_SRPT_SRQ_SIZE) {
3665 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
3669 sport->port_attrib.srp_sq_size = val;
3674 TF_TPG_ATTRIB_ATTR(srpt, srp_sq_size, S_IRUGO | S_IWUSR);
3676 static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
3677 &srpt_tpg_attrib_srp_max_rdma_size.attr,
3678 &srpt_tpg_attrib_srp_max_rsp_size.attr,
3679 &srpt_tpg_attrib_srp_sq_size.attr,
3683 static ssize_t srpt_tpg_show_enable(
3684 struct se_portal_group *se_tpg,
3687 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3689 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
3692 static ssize_t srpt_tpg_store_enable(
3693 struct se_portal_group *se_tpg,
3697 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3701 ret = kstrtoul(page, 0, &tmp);
3703 pr_err("Unable to extract srpt_tpg_store_enable\n");
3707 if ((tmp != 0) && (tmp != 1)) {
3708 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
3712 sport->enabled = true;
3714 sport->enabled = false;
3719 TF_TPG_BASE_ATTR(srpt, enable, S_IRUGO | S_IWUSR);
3721 static struct configfs_attribute *srpt_tpg_attrs[] = {
3722 &srpt_tpg_enable.attr,
3727 * configfs callback invoked for
3728 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
3730 static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
3731 struct config_group *group,
3734 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3737 /* Initialize sport->port_wwn and sport->port_tpg_1 */
3738 res = core_tpg_register(&sport->port_wwn, &sport->port_tpg_1, SCSI_PROTOCOL_SRP);
3740 return ERR_PTR(res);
3742 return &sport->port_tpg_1;
3746 * configfs callback invoked for
3747 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
3749 static void srpt_drop_tpg(struct se_portal_group *tpg)
3751 struct srpt_port *sport = container_of(tpg,
3752 struct srpt_port, port_tpg_1);
3754 sport->enabled = false;
3755 core_tpg_deregister(&sport->port_tpg_1);
3759 * configfs callback invoked for
3760 * mkdir /sys/kernel/config/target/$driver/$port
3762 static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3763 struct config_group *group,
3766 struct srpt_port *sport;
3769 sport = srpt_lookup_port(name);
3770 pr_debug("make_tport(%s)\n", name);
3775 return &sport->port_wwn;
3778 return ERR_PTR(ret);
3782 * configfs callback invoked for
3783 * rmdir /sys/kernel/config/target/$driver/$port
3785 static void srpt_drop_tport(struct se_wwn *wwn)
3787 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3789 pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item));
3792 static ssize_t srpt_wwn_show_attr_version(struct target_fabric_configfs *tf,
3795 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3798 TF_WWN_ATTR_RO(srpt, version);
3800 static struct configfs_attribute *srpt_wwn_attrs[] = {
3801 &srpt_wwn_version.attr,
3805 static const struct target_core_fabric_ops srpt_template = {
3806 .module = THIS_MODULE,
3808 .node_acl_size = sizeof(struct srpt_node_acl),
3809 .get_fabric_name = srpt_get_fabric_name,
3810 .tpg_get_wwn = srpt_get_fabric_wwn,
3811 .tpg_get_tag = srpt_get_tag,
3812 .tpg_check_demo_mode = srpt_check_false,
3813 .tpg_check_demo_mode_cache = srpt_check_true,
3814 .tpg_check_demo_mode_write_protect = srpt_check_true,
3815 .tpg_check_prod_mode_write_protect = srpt_check_false,
3816 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3817 .release_cmd = srpt_release_cmd,
3818 .check_stop_free = srpt_check_stop_free,
3819 .shutdown_session = srpt_shutdown_session,
3820 .close_session = srpt_close_session,
3821 .sess_get_index = srpt_sess_get_index,
3822 .sess_get_initiator_sid = NULL,
3823 .write_pending = srpt_write_pending,
3824 .write_pending_status = srpt_write_pending_status,
3825 .set_default_node_attributes = srpt_set_default_node_attrs,
3826 .get_cmd_state = srpt_get_tcm_cmd_state,
3827 .queue_data_in = srpt_queue_data_in,
3828 .queue_status = srpt_queue_status,
3829 .queue_tm_rsp = srpt_queue_tm_rsp,
3830 .aborted_task = srpt_aborted_task,
3832 * Setup function pointers for generic logic in
3833 * target_core_fabric_configfs.c
3835 .fabric_make_wwn = srpt_make_tport,
3836 .fabric_drop_wwn = srpt_drop_tport,
3837 .fabric_make_tpg = srpt_make_tpg,
3838 .fabric_drop_tpg = srpt_drop_tpg,
3839 .fabric_init_nodeacl = srpt_init_nodeacl,
3840 .fabric_cleanup_nodeacl = srpt_cleanup_nodeacl,
3842 .tfc_wwn_attrs = srpt_wwn_attrs,
3843 .tfc_tpg_base_attrs = srpt_tpg_attrs,
3844 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
3848 * srpt_init_module() - Kernel module initialization.
3850 * Note: Since ib_register_client() registers callback functions, and since at
3851 * least one of these callback functions (srpt_add_one()) calls target core
3852 * functions, this driver must be registered with the target core before
3853 * ib_register_client() is called.
3855 static int __init srpt_init_module(void)
3860 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
3861 pr_err("invalid value %d for kernel module parameter"
3862 " srp_max_req_size -- must be at least %d.\n",
3863 srp_max_req_size, MIN_MAX_REQ_SIZE);
3867 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3868 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
3869 pr_err("invalid value %d for kernel module parameter"
3870 " srpt_srq_size -- must be in the range [%d..%d].\n",
3871 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3875 ret = target_register_template(&srpt_template);
3879 ret = ib_register_client(&srpt_client);
3881 pr_err("couldn't register IB client\n");
3882 goto out_unregister_target;
3887 out_unregister_target:
3888 target_unregister_template(&srpt_template);
3893 static void __exit srpt_cleanup_module(void)
3895 ib_unregister_client(&srpt_client);
3896 target_unregister_template(&srpt_template);
3899 module_init(srpt_init_module);
3900 module_exit(srpt_cleanup_module);