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>
50 #include <target/target_core_configfs.h>
53 /* Name of this kernel module. */
54 #define DRV_NAME "ib_srpt"
55 #define DRV_VERSION "2.0.0"
56 #define DRV_RELDATE "2011-02-14"
58 #define SRPT_ID_STRING "Linux SRP target"
61 #define pr_fmt(fmt) DRV_NAME " " fmt
63 MODULE_AUTHOR("Vu Pham and Bart Van Assche");
64 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
65 "v" DRV_VERSION " (" DRV_RELDATE ")");
66 MODULE_LICENSE("Dual BSD/GPL");
72 static u64 srpt_service_guid;
73 static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */
74 static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */
76 static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
77 module_param(srp_max_req_size, int, 0444);
78 MODULE_PARM_DESC(srp_max_req_size,
79 "Maximum size of SRP request messages in bytes.");
81 static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
82 module_param(srpt_srq_size, int, 0444);
83 MODULE_PARM_DESC(srpt_srq_size,
84 "Shared receive queue (SRQ) size.");
86 static int srpt_get_u64_x(char *buffer, struct kernel_param *kp)
88 return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
90 module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
92 MODULE_PARM_DESC(srpt_service_guid,
93 "Using this value for ioc_guid, id_ext, and cm_listen_id"
94 " instead of using the node_guid of the first HCA.");
96 static struct ib_client srpt_client;
97 static const struct target_core_fabric_ops srpt_template;
98 static void srpt_release_channel(struct srpt_rdma_ch *ch);
99 static int srpt_queue_status(struct se_cmd *cmd);
102 * opposite_dma_dir() - Swap DMA_TO_DEVICE and DMA_FROM_DEVICE.
105 enum dma_data_direction opposite_dma_dir(enum dma_data_direction dir)
108 case DMA_TO_DEVICE: return DMA_FROM_DEVICE;
109 case DMA_FROM_DEVICE: return DMA_TO_DEVICE;
115 * srpt_sdev_name() - Return the name associated with the HCA.
117 * Examples are ib0, ib1, ...
119 static inline const char *srpt_sdev_name(struct srpt_device *sdev)
121 return sdev->device->name;
124 static enum rdma_ch_state srpt_get_ch_state(struct srpt_rdma_ch *ch)
127 enum rdma_ch_state state;
129 spin_lock_irqsave(&ch->spinlock, flags);
131 spin_unlock_irqrestore(&ch->spinlock, flags);
135 static enum rdma_ch_state
136 srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new_state)
139 enum rdma_ch_state prev;
141 spin_lock_irqsave(&ch->spinlock, flags);
143 ch->state = new_state;
144 spin_unlock_irqrestore(&ch->spinlock, flags);
149 * srpt_test_and_set_ch_state() - Test and set the channel state.
151 * Returns true if and only if the channel state has been set to the new state.
154 srpt_test_and_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state old,
155 enum rdma_ch_state new)
158 enum rdma_ch_state prev;
160 spin_lock_irqsave(&ch->spinlock, flags);
164 spin_unlock_irqrestore(&ch->spinlock, flags);
169 * srpt_event_handler() - Asynchronous IB event callback function.
171 * Callback function called by the InfiniBand core when an asynchronous IB
172 * event occurs. This callback may occur in interrupt context. See also
173 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
174 * Architecture Specification.
176 static void srpt_event_handler(struct ib_event_handler *handler,
177 struct ib_event *event)
179 struct srpt_device *sdev;
180 struct srpt_port *sport;
182 sdev = ib_get_client_data(event->device, &srpt_client);
183 if (!sdev || sdev->device != event->device)
186 pr_debug("ASYNC event= %d on device= %s\n", event->event,
187 srpt_sdev_name(sdev));
189 switch (event->event) {
190 case IB_EVENT_PORT_ERR:
191 if (event->element.port_num <= sdev->device->phys_port_cnt) {
192 sport = &sdev->port[event->element.port_num - 1];
197 case IB_EVENT_PORT_ACTIVE:
198 case IB_EVENT_LID_CHANGE:
199 case IB_EVENT_PKEY_CHANGE:
200 case IB_EVENT_SM_CHANGE:
201 case IB_EVENT_CLIENT_REREGISTER:
202 case IB_EVENT_GID_CHANGE:
203 /* Refresh port data asynchronously. */
204 if (event->element.port_num <= sdev->device->phys_port_cnt) {
205 sport = &sdev->port[event->element.port_num - 1];
206 if (!sport->lid && !sport->sm_lid)
207 schedule_work(&sport->work);
211 pr_err("received unrecognized IB event %d\n",
218 * srpt_srq_event() - SRQ event callback function.
220 static void srpt_srq_event(struct ib_event *event, void *ctx)
222 pr_info("SRQ event %d\n", event->event);
226 * srpt_qp_event() - QP event callback function.
228 static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
230 pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n",
231 event->event, ch->cm_id, ch->sess_name, srpt_get_ch_state(ch));
233 switch (event->event) {
234 case IB_EVENT_COMM_EST:
235 ib_cm_notify(ch->cm_id, event->event);
237 case IB_EVENT_QP_LAST_WQE_REACHED:
238 if (srpt_test_and_set_ch_state(ch, CH_DRAINING,
240 srpt_release_channel(ch);
242 pr_debug("%s: state %d - ignored LAST_WQE.\n",
243 ch->sess_name, srpt_get_ch_state(ch));
246 pr_err("received unrecognized IB QP event %d\n", event->event);
252 * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure.
254 * @slot: one-based slot number.
255 * @value: four-bit value.
257 * Copies the lowest four bits of value in element slot of the array of four
258 * bit elements called c_list (controller list). The index slot is one-based.
260 static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
267 tmp = c_list[id] & 0xf;
268 c_list[id] = (value << 4) | tmp;
270 tmp = c_list[id] & 0xf0;
271 c_list[id] = (value & 0xf) | tmp;
276 * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram.
278 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
281 static void srpt_get_class_port_info(struct ib_dm_mad *mad)
283 struct ib_class_port_info *cif;
285 cif = (struct ib_class_port_info *)mad->data;
286 memset(cif, 0, sizeof *cif);
287 cif->base_version = 1;
288 cif->class_version = 1;
289 cif->resp_time_value = 20;
291 mad->mad_hdr.status = 0;
295 * srpt_get_iou() - Write IOUnitInfo to a management datagram.
297 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
298 * Specification. See also section B.7, table B.6 in the SRP r16a document.
300 static void srpt_get_iou(struct ib_dm_mad *mad)
302 struct ib_dm_iou_info *ioui;
306 ioui = (struct ib_dm_iou_info *)mad->data;
307 ioui->change_id = __constant_cpu_to_be16(1);
308 ioui->max_controllers = 16;
310 /* set present for slot 1 and empty for the rest */
311 srpt_set_ioc(ioui->controller_list, 1, 1);
312 for (i = 1, slot = 2; i < 16; i++, slot++)
313 srpt_set_ioc(ioui->controller_list, slot, 0);
315 mad->mad_hdr.status = 0;
319 * srpt_get_ioc() - Write IOControllerprofile to a management datagram.
321 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
322 * Architecture Specification. See also section B.7, table B.7 in the SRP
325 static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
326 struct ib_dm_mad *mad)
328 struct srpt_device *sdev = sport->sdev;
329 struct ib_dm_ioc_profile *iocp;
331 iocp = (struct ib_dm_ioc_profile *)mad->data;
333 if (!slot || slot > 16) {
335 = __constant_cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
341 = __constant_cpu_to_be16(DM_MAD_STATUS_NO_IOC);
345 memset(iocp, 0, sizeof *iocp);
346 strcpy(iocp->id_string, SRPT_ID_STRING);
347 iocp->guid = cpu_to_be64(srpt_service_guid);
348 iocp->vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
349 iocp->device_id = cpu_to_be32(sdev->dev_attr.vendor_part_id);
350 iocp->device_version = cpu_to_be16(sdev->dev_attr.hw_ver);
351 iocp->subsys_vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
352 iocp->subsys_device_id = 0x0;
353 iocp->io_class = __constant_cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
354 iocp->io_subclass = __constant_cpu_to_be16(SRP_IO_SUBCLASS);
355 iocp->protocol = __constant_cpu_to_be16(SRP_PROTOCOL);
356 iocp->protocol_version = __constant_cpu_to_be16(SRP_PROTOCOL_VERSION);
357 iocp->send_queue_depth = cpu_to_be16(sdev->srq_size);
358 iocp->rdma_read_depth = 4;
359 iocp->send_size = cpu_to_be32(srp_max_req_size);
360 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
362 iocp->num_svc_entries = 1;
363 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
364 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
366 mad->mad_hdr.status = 0;
370 * srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
372 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
373 * Specification. See also section B.7, table B.8 in the SRP r16a document.
375 static void srpt_get_svc_entries(u64 ioc_guid,
376 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
378 struct ib_dm_svc_entries *svc_entries;
382 if (!slot || slot > 16) {
384 = __constant_cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
388 if (slot > 2 || lo > hi || hi > 1) {
390 = __constant_cpu_to_be16(DM_MAD_STATUS_NO_IOC);
394 svc_entries = (struct ib_dm_svc_entries *)mad->data;
395 memset(svc_entries, 0, sizeof *svc_entries);
396 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
397 snprintf(svc_entries->service_entries[0].name,
398 sizeof(svc_entries->service_entries[0].name),
400 SRP_SERVICE_NAME_PREFIX,
403 mad->mad_hdr.status = 0;
407 * srpt_mgmt_method_get() - Process a received management datagram.
408 * @sp: source port through which the MAD has been received.
409 * @rq_mad: received MAD.
410 * @rsp_mad: response MAD.
412 static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
413 struct ib_dm_mad *rsp_mad)
419 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
421 case DM_ATTR_CLASS_PORT_INFO:
422 srpt_get_class_port_info(rsp_mad);
424 case DM_ATTR_IOU_INFO:
425 srpt_get_iou(rsp_mad);
427 case DM_ATTR_IOC_PROFILE:
428 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
429 srpt_get_ioc(sp, slot, rsp_mad);
431 case DM_ATTR_SVC_ENTRIES:
432 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
433 hi = (u8) ((slot >> 8) & 0xff);
434 lo = (u8) (slot & 0xff);
435 slot = (u16) ((slot >> 16) & 0xffff);
436 srpt_get_svc_entries(srpt_service_guid,
437 slot, hi, lo, rsp_mad);
440 rsp_mad->mad_hdr.status =
441 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
447 * srpt_mad_send_handler() - Post MAD-send callback function.
449 static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
450 struct ib_mad_send_wc *mad_wc)
452 ib_destroy_ah(mad_wc->send_buf->ah);
453 ib_free_send_mad(mad_wc->send_buf);
457 * srpt_mad_recv_handler() - MAD reception callback function.
459 static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
460 struct ib_mad_recv_wc *mad_wc)
462 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
464 struct ib_mad_send_buf *rsp;
465 struct ib_dm_mad *dm_mad;
467 if (!mad_wc || !mad_wc->recv_buf.mad)
470 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
471 mad_wc->recv_buf.grh, mad_agent->port_num);
475 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
477 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
478 mad_wc->wc->pkey_index, 0,
479 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
487 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof *dm_mad);
488 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
489 dm_mad->mad_hdr.status = 0;
491 switch (mad_wc->recv_buf.mad->mad_hdr.method) {
492 case IB_MGMT_METHOD_GET:
493 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
495 case IB_MGMT_METHOD_SET:
496 dm_mad->mad_hdr.status =
497 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
500 dm_mad->mad_hdr.status =
501 __constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
505 if (!ib_post_send_mad(rsp, NULL)) {
506 ib_free_recv_mad(mad_wc);
507 /* will destroy_ah & free_send_mad in send completion */
511 ib_free_send_mad(rsp);
516 ib_free_recv_mad(mad_wc);
520 * srpt_refresh_port() - Configure a HCA port.
522 * Enable InfiniBand management datagram processing, update the cached sm_lid,
523 * lid and gid values, and register a callback function for processing MADs
524 * on the specified port.
526 * Note: It is safe to call this function more than once for the same port.
528 static int srpt_refresh_port(struct srpt_port *sport)
530 struct ib_mad_reg_req reg_req;
531 struct ib_port_modify port_modify;
532 struct ib_port_attr port_attr;
535 memset(&port_modify, 0, sizeof port_modify);
536 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
537 port_modify.clr_port_cap_mask = 0;
539 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
543 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
547 sport->sm_lid = port_attr.sm_lid;
548 sport->lid = port_attr.lid;
550 ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
554 if (!sport->mad_agent) {
555 memset(®_req, 0, sizeof reg_req);
556 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
557 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
558 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
559 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
561 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
565 srpt_mad_send_handler,
566 srpt_mad_recv_handler,
568 if (IS_ERR(sport->mad_agent)) {
569 ret = PTR_ERR(sport->mad_agent);
570 sport->mad_agent = NULL;
579 port_modify.set_port_cap_mask = 0;
580 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
581 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
589 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
591 * Note: It is safe to call this function more than once for the same device.
593 static void srpt_unregister_mad_agent(struct srpt_device *sdev)
595 struct ib_port_modify port_modify = {
596 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
598 struct srpt_port *sport;
601 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
602 sport = &sdev->port[i - 1];
603 WARN_ON(sport->port != i);
604 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
605 pr_err("disabling MAD processing failed.\n");
606 if (sport->mad_agent) {
607 ib_unregister_mad_agent(sport->mad_agent);
608 sport->mad_agent = NULL;
614 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
616 static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
617 int ioctx_size, int dma_size,
618 enum dma_data_direction dir)
620 struct srpt_ioctx *ioctx;
622 ioctx = kmalloc(ioctx_size, GFP_KERNEL);
626 ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
630 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
631 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
645 * srpt_free_ioctx() - Free an SRPT I/O context structure.
647 static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
648 int dma_size, enum dma_data_direction dir)
653 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
659 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
660 * @sdev: Device to allocate the I/O context ring for.
661 * @ring_size: Number of elements in the I/O context ring.
662 * @ioctx_size: I/O context size.
663 * @dma_size: DMA buffer size.
664 * @dir: DMA data direction.
666 static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
667 int ring_size, int ioctx_size,
668 int dma_size, enum dma_data_direction dir)
670 struct srpt_ioctx **ring;
673 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
674 && ioctx_size != sizeof(struct srpt_send_ioctx));
676 ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
679 for (i = 0; i < ring_size; ++i) {
680 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
689 srpt_free_ioctx(sdev, ring[i], dma_size, dir);
697 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
699 static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
700 struct srpt_device *sdev, int ring_size,
701 int dma_size, enum dma_data_direction dir)
705 for (i = 0; i < ring_size; ++i)
706 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
711 * srpt_get_cmd_state() - Get the state of a SCSI command.
713 static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx)
715 enum srpt_command_state state;
720 spin_lock_irqsave(&ioctx->spinlock, flags);
721 state = ioctx->state;
722 spin_unlock_irqrestore(&ioctx->spinlock, flags);
727 * srpt_set_cmd_state() - Set the state of a SCSI command.
729 * Does not modify the state of aborted commands. Returns the previous command
732 static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
733 enum srpt_command_state new)
735 enum srpt_command_state previous;
740 spin_lock_irqsave(&ioctx->spinlock, flags);
741 previous = ioctx->state;
742 if (previous != SRPT_STATE_DONE)
744 spin_unlock_irqrestore(&ioctx->spinlock, flags);
750 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
752 * Returns true if and only if the previous command state was equal to 'old'.
754 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
755 enum srpt_command_state old,
756 enum srpt_command_state new)
758 enum srpt_command_state previous;
762 WARN_ON(old == SRPT_STATE_DONE);
763 WARN_ON(new == SRPT_STATE_NEW);
765 spin_lock_irqsave(&ioctx->spinlock, flags);
766 previous = ioctx->state;
769 spin_unlock_irqrestore(&ioctx->spinlock, flags);
770 return previous == old;
774 * srpt_post_recv() - Post an IB receive request.
776 static int srpt_post_recv(struct srpt_device *sdev,
777 struct srpt_recv_ioctx *ioctx)
780 struct ib_recv_wr wr, *bad_wr;
783 wr.wr_id = encode_wr_id(SRPT_RECV, ioctx->ioctx.index);
785 list.addr = ioctx->ioctx.dma;
786 list.length = srp_max_req_size;
787 list.lkey = sdev->mr->lkey;
793 return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
797 * srpt_post_send() - Post an IB send request.
799 * Returns zero upon success and a non-zero value upon failure.
801 static int srpt_post_send(struct srpt_rdma_ch *ch,
802 struct srpt_send_ioctx *ioctx, int len)
805 struct ib_send_wr wr, *bad_wr;
806 struct srpt_device *sdev = ch->sport->sdev;
809 atomic_inc(&ch->req_lim);
812 if (unlikely(atomic_dec_return(&ch->sq_wr_avail) < 0)) {
813 pr_warn("IB send queue full (needed 1)\n");
817 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len,
820 list.addr = ioctx->ioctx.dma;
822 list.lkey = sdev->mr->lkey;
825 wr.wr_id = encode_wr_id(SRPT_SEND, ioctx->ioctx.index);
828 wr.opcode = IB_WR_SEND;
829 wr.send_flags = IB_SEND_SIGNALED;
831 ret = ib_post_send(ch->qp, &wr, &bad_wr);
835 atomic_inc(&ch->sq_wr_avail);
836 atomic_dec(&ch->req_lim);
842 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
843 * @ioctx: Pointer to the I/O context associated with the request.
844 * @srp_cmd: Pointer to the SRP_CMD request data.
845 * @dir: Pointer to the variable to which the transfer direction will be
847 * @data_len: Pointer to the variable to which the total data length of all
848 * descriptors in the SRP_CMD request will be written.
850 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
852 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
853 * -ENOMEM when memory allocation fails and zero upon success.
855 static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
856 struct srp_cmd *srp_cmd,
857 enum dma_data_direction *dir, u64 *data_len)
859 struct srp_indirect_buf *idb;
860 struct srp_direct_buf *db;
861 unsigned add_cdb_offset;
865 * The pointer computations below will only be compiled correctly
866 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
867 * whether srp_cmd::add_data has been declared as a byte pointer.
869 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0)
870 && !__same_type(srp_cmd->add_data[0], (u8)0));
879 * The lower four bits of the buffer format field contain the DATA-IN
880 * buffer descriptor format, and the highest four bits contain the
881 * DATA-OUT buffer descriptor format.
884 if (srp_cmd->buf_fmt & 0xf)
885 /* DATA-IN: transfer data from target to initiator (read). */
886 *dir = DMA_FROM_DEVICE;
887 else if (srp_cmd->buf_fmt >> 4)
888 /* DATA-OUT: transfer data from initiator to target (write). */
889 *dir = DMA_TO_DEVICE;
892 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
893 * CDB LENGTH' field are reserved and the size in bytes of this field
894 * is four times the value specified in bits 3..7. Hence the "& ~3".
896 add_cdb_offset = srp_cmd->add_cdb_len & ~3;
897 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
898 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
900 ioctx->rbufs = &ioctx->single_rbuf;
902 db = (struct srp_direct_buf *)(srp_cmd->add_data
904 memcpy(ioctx->rbufs, db, sizeof *db);
905 *data_len = be32_to_cpu(db->len);
906 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
907 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
908 idb = (struct srp_indirect_buf *)(srp_cmd->add_data
911 ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof *db;
914 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
915 pr_err("received unsupported SRP_CMD request"
916 " type (%u out + %u in != %u / %zu)\n",
917 srp_cmd->data_out_desc_cnt,
918 srp_cmd->data_in_desc_cnt,
919 be32_to_cpu(idb->table_desc.len),
926 if (ioctx->n_rbuf == 1)
927 ioctx->rbufs = &ioctx->single_rbuf;
930 kmalloc(ioctx->n_rbuf * sizeof *db, GFP_ATOMIC);
939 memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof *db);
940 *data_len = be32_to_cpu(idb->len);
947 * srpt_init_ch_qp() - Initialize queue pair attributes.
949 * Initialized the attributes of queue pair 'qp' by allowing local write,
950 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
952 static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
954 struct ib_qp_attr *attr;
957 attr = kzalloc(sizeof *attr, GFP_KERNEL);
961 attr->qp_state = IB_QPS_INIT;
962 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
963 IB_ACCESS_REMOTE_WRITE;
964 attr->port_num = ch->sport->port;
965 attr->pkey_index = 0;
967 ret = ib_modify_qp(qp, attr,
968 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
976 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
977 * @ch: channel of the queue pair.
978 * @qp: queue pair to change the state of.
980 * Returns zero upon success and a negative value upon failure.
982 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
983 * If this structure ever becomes larger, it might be necessary to allocate
984 * it dynamically instead of on the stack.
986 static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
988 struct ib_qp_attr qp_attr;
992 qp_attr.qp_state = IB_QPS_RTR;
993 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
997 qp_attr.max_dest_rd_atomic = 4;
999 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1006 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1007 * @ch: channel of the queue pair.
1008 * @qp: queue pair to change the state of.
1010 * Returns zero upon success and a negative value upon failure.
1012 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1013 * If this structure ever becomes larger, it might be necessary to allocate
1014 * it dynamically instead of on the stack.
1016 static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1018 struct ib_qp_attr qp_attr;
1022 qp_attr.qp_state = IB_QPS_RTS;
1023 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1027 qp_attr.max_rd_atomic = 4;
1029 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1036 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1038 static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1040 struct ib_qp_attr qp_attr;
1042 qp_attr.qp_state = IB_QPS_ERR;
1043 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1047 * srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list.
1049 static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1050 struct srpt_send_ioctx *ioctx)
1052 struct scatterlist *sg;
1053 enum dma_data_direction dir;
1057 BUG_ON(ioctx->n_rdma && !ioctx->rdma_ius);
1059 while (ioctx->n_rdma)
1060 kfree(ioctx->rdma_ius[--ioctx->n_rdma].sge);
1062 kfree(ioctx->rdma_ius);
1063 ioctx->rdma_ius = NULL;
1065 if (ioctx->mapped_sg_count) {
1068 dir = ioctx->cmd.data_direction;
1069 BUG_ON(dir == DMA_NONE);
1070 ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt,
1071 opposite_dma_dir(dir));
1072 ioctx->mapped_sg_count = 0;
1077 * srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list.
1079 static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1080 struct srpt_send_ioctx *ioctx)
1082 struct ib_device *dev = ch->sport->sdev->device;
1084 struct scatterlist *sg, *sg_orig;
1086 enum dma_data_direction dir;
1087 struct rdma_iu *riu;
1088 struct srp_direct_buf *db;
1089 dma_addr_t dma_addr;
1101 dir = cmd->data_direction;
1102 BUG_ON(dir == DMA_NONE);
1104 ioctx->sg = sg = sg_orig = cmd->t_data_sg;
1105 ioctx->sg_cnt = sg_cnt = cmd->t_data_nents;
1107 count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt,
1108 opposite_dma_dir(dir));
1109 if (unlikely(!count))
1112 ioctx->mapped_sg_count = count;
1114 if (ioctx->rdma_ius && ioctx->n_rdma_ius)
1115 nrdma = ioctx->n_rdma_ius;
1117 nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE
1120 ioctx->rdma_ius = kzalloc(nrdma * sizeof *riu, GFP_KERNEL);
1121 if (!ioctx->rdma_ius)
1124 ioctx->n_rdma_ius = nrdma;
1128 tsize = cmd->data_length;
1129 dma_len = ib_sg_dma_len(dev, &sg[0]);
1130 riu = ioctx->rdma_ius;
1133 * For each remote desc - calculate the #ib_sge.
1134 * If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then
1135 * each remote desc rdma_iu is required a rdma wr;
1137 * we need to allocate extra rdma_iu to carry extra #ib_sge in
1141 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1142 rsize = be32_to_cpu(db->len);
1143 raddr = be64_to_cpu(db->va);
1145 riu->rkey = be32_to_cpu(db->key);
1148 /* calculate how many sge required for this remote_buf */
1149 while (rsize > 0 && tsize > 0) {
1151 if (rsize >= dma_len) {
1160 dma_len = ib_sg_dma_len(
1172 if (rsize > 0 && riu->sge_cnt == SRPT_DEF_SG_PER_WQE) {
1175 kmalloc(riu->sge_cnt * sizeof *riu->sge,
1183 riu->rkey = be32_to_cpu(db->key);
1188 riu->sge = kmalloc(riu->sge_cnt * sizeof *riu->sge,
1195 tsize = cmd->data_length;
1196 riu = ioctx->rdma_ius;
1198 dma_len = ib_sg_dma_len(dev, &sg[0]);
1199 dma_addr = ib_sg_dma_address(dev, &sg[0]);
1201 /* this second loop is really mapped sg_addres to rdma_iu->ib_sge */
1203 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1204 rsize = be32_to_cpu(db->len);
1208 while (rsize > 0 && tsize > 0) {
1209 sge->addr = dma_addr;
1210 sge->lkey = ch->sport->sdev->mr->lkey;
1212 if (rsize >= dma_len) {
1214 (tsize < dma_len) ? tsize : dma_len;
1222 dma_len = ib_sg_dma_len(
1224 dma_addr = ib_sg_dma_address(
1229 sge->length = (tsize < rsize) ? tsize : rsize;
1237 if (k == riu->sge_cnt && rsize > 0 && tsize > 0) {
1241 } else if (rsize > 0 && tsize > 0)
1249 srpt_unmap_sg_to_ib_sge(ch, ioctx);
1255 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1257 static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1259 struct srpt_send_ioctx *ioctx;
1260 unsigned long flags;
1265 spin_lock_irqsave(&ch->spinlock, flags);
1266 if (!list_empty(&ch->free_list)) {
1267 ioctx = list_first_entry(&ch->free_list,
1268 struct srpt_send_ioctx, free_list);
1269 list_del(&ioctx->free_list);
1271 spin_unlock_irqrestore(&ch->spinlock, flags);
1276 BUG_ON(ioctx->ch != ch);
1277 spin_lock_init(&ioctx->spinlock);
1278 ioctx->state = SRPT_STATE_NEW;
1280 ioctx->rbufs = NULL;
1282 ioctx->n_rdma_ius = 0;
1283 ioctx->rdma_ius = NULL;
1284 ioctx->mapped_sg_count = 0;
1285 init_completion(&ioctx->tx_done);
1286 ioctx->queue_status_only = false;
1288 * transport_init_se_cmd() does not initialize all fields, so do it
1291 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1292 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1298 * srpt_abort_cmd() - Abort a SCSI command.
1299 * @ioctx: I/O context associated with the SCSI command.
1300 * @context: Preferred execution context.
1302 static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1304 enum srpt_command_state state;
1305 unsigned long flags;
1310 * If the command is in a state where the target core is waiting for
1311 * the ib_srpt driver, change the state to the next state. Changing
1312 * the state of the command from SRPT_STATE_NEED_DATA to
1313 * SRPT_STATE_DATA_IN ensures that srpt_xmit_response() will call this
1314 * function a second time.
1317 spin_lock_irqsave(&ioctx->spinlock, flags);
1318 state = ioctx->state;
1320 case SRPT_STATE_NEED_DATA:
1321 ioctx->state = SRPT_STATE_DATA_IN;
1323 case SRPT_STATE_DATA_IN:
1324 case SRPT_STATE_CMD_RSP_SENT:
1325 case SRPT_STATE_MGMT_RSP_SENT:
1326 ioctx->state = SRPT_STATE_DONE;
1331 spin_unlock_irqrestore(&ioctx->spinlock, flags);
1333 if (state == SRPT_STATE_DONE) {
1334 struct srpt_rdma_ch *ch = ioctx->ch;
1336 BUG_ON(ch->sess == NULL);
1338 target_put_sess_cmd(ch->sess, &ioctx->cmd);
1342 pr_debug("Aborting cmd with state %d and tag %lld\n", state,
1346 case SRPT_STATE_NEW:
1347 case SRPT_STATE_DATA_IN:
1348 case SRPT_STATE_MGMT:
1350 * Do nothing - defer abort processing until
1351 * srpt_queue_response() is invoked.
1353 WARN_ON(!transport_check_aborted_status(&ioctx->cmd, false));
1355 case SRPT_STATE_NEED_DATA:
1356 /* DMA_TO_DEVICE (write) - RDMA read error. */
1358 /* XXX(hch): this is a horrible layering violation.. */
1359 spin_lock_irqsave(&ioctx->cmd.t_state_lock, flags);
1360 ioctx->cmd.transport_state &= ~CMD_T_ACTIVE;
1361 spin_unlock_irqrestore(&ioctx->cmd.t_state_lock, flags);
1363 case SRPT_STATE_CMD_RSP_SENT:
1365 * SRP_RSP sending failed or the SRP_RSP send completion has
1366 * not been received in time.
1368 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
1369 target_put_sess_cmd(ioctx->ch->sess, &ioctx->cmd);
1371 case SRPT_STATE_MGMT_RSP_SENT:
1372 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1373 target_put_sess_cmd(ioctx->ch->sess, &ioctx->cmd);
1376 WARN(1, "Unexpected command state (%d)", state);
1385 * srpt_handle_send_err_comp() - Process an IB_WC_SEND error completion.
1387 static void srpt_handle_send_err_comp(struct srpt_rdma_ch *ch, u64 wr_id)
1389 struct srpt_send_ioctx *ioctx;
1390 enum srpt_command_state state;
1394 atomic_inc(&ch->sq_wr_avail);
1396 index = idx_from_wr_id(wr_id);
1397 ioctx = ch->ioctx_ring[index];
1398 state = srpt_get_cmd_state(ioctx);
1401 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
1402 && state != SRPT_STATE_MGMT_RSP_SENT
1403 && state != SRPT_STATE_NEED_DATA
1404 && state != SRPT_STATE_DONE);
1406 /* If SRP_RSP sending failed, undo the ch->req_lim change. */
1407 if (state == SRPT_STATE_CMD_RSP_SENT
1408 || state == SRPT_STATE_MGMT_RSP_SENT)
1409 atomic_dec(&ch->req_lim);
1411 srpt_abort_cmd(ioctx);
1415 * srpt_handle_send_comp() - Process an IB send completion notification.
1417 static void srpt_handle_send_comp(struct srpt_rdma_ch *ch,
1418 struct srpt_send_ioctx *ioctx)
1420 enum srpt_command_state state;
1422 atomic_inc(&ch->sq_wr_avail);
1424 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1426 if (WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
1427 && state != SRPT_STATE_MGMT_RSP_SENT
1428 && state != SRPT_STATE_DONE))
1429 pr_debug("state = %d\n", state);
1431 if (state != SRPT_STATE_DONE) {
1432 srpt_unmap_sg_to_ib_sge(ch, ioctx);
1433 transport_generic_free_cmd(&ioctx->cmd, 0);
1435 pr_err("IB completion has been received too late for"
1436 " wr_id = %u.\n", ioctx->ioctx.index);
1441 * srpt_handle_rdma_comp() - Process an IB RDMA completion notification.
1443 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1444 * the data that has been transferred via IB RDMA had to be postponed until the
1445 * check_stop_free() callback. None of this is necessary anymore and needs to
1448 static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch,
1449 struct srpt_send_ioctx *ioctx,
1450 enum srpt_opcode opcode)
1452 WARN_ON(ioctx->n_rdma <= 0);
1453 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1455 if (opcode == SRPT_RDMA_READ_LAST) {
1456 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1457 SRPT_STATE_DATA_IN))
1458 target_execute_cmd(&ioctx->cmd);
1460 pr_err("%s[%d]: wrong state = %d\n", __func__,
1461 __LINE__, srpt_get_cmd_state(ioctx));
1462 } else if (opcode == SRPT_RDMA_ABORT) {
1463 ioctx->rdma_aborted = true;
1465 WARN(true, "unexpected opcode %d\n", opcode);
1470 * srpt_handle_rdma_err_comp() - Process an IB RDMA error completion.
1472 static void srpt_handle_rdma_err_comp(struct srpt_rdma_ch *ch,
1473 struct srpt_send_ioctx *ioctx,
1474 enum srpt_opcode opcode)
1477 enum srpt_command_state state;
1480 state = srpt_get_cmd_state(ioctx);
1482 case SRPT_RDMA_READ_LAST:
1483 if (ioctx->n_rdma <= 0) {
1484 pr_err("Received invalid RDMA read"
1485 " error completion with idx %d\n",
1486 ioctx->ioctx.index);
1489 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1490 if (state == SRPT_STATE_NEED_DATA)
1491 srpt_abort_cmd(ioctx);
1493 pr_err("%s[%d]: wrong state = %d\n",
1494 __func__, __LINE__, state);
1496 case SRPT_RDMA_WRITE_LAST:
1499 pr_err("%s[%d]: opcode = %u\n", __func__, __LINE__, opcode);
1505 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1506 * @ch: RDMA channel through which the request has been received.
1507 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1508 * be built in the buffer ioctx->buf points at and hence this function will
1509 * overwrite the request data.
1510 * @tag: tag of the request for which this response is being generated.
1511 * @status: value for the STATUS field of the SRP_RSP information unit.
1513 * Returns the size in bytes of the SRP_RSP response.
1515 * An SRP_RSP response contains a SCSI status or service response. See also
1516 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1517 * response. See also SPC-2 for more information about sense data.
1519 static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1520 struct srpt_send_ioctx *ioctx, u64 tag,
1523 struct srp_rsp *srp_rsp;
1524 const u8 *sense_data;
1525 int sense_data_len, max_sense_len;
1528 * The lowest bit of all SAM-3 status codes is zero (see also
1529 * paragraph 5.3 in SAM-3).
1531 WARN_ON(status & 1);
1533 srp_rsp = ioctx->ioctx.buf;
1536 sense_data = ioctx->sense_data;
1537 sense_data_len = ioctx->cmd.scsi_sense_length;
1538 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1540 memset(srp_rsp, 0, sizeof *srp_rsp);
1541 srp_rsp->opcode = SRP_RSP;
1542 srp_rsp->req_lim_delta =
1543 __constant_cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1545 srp_rsp->status = status;
1547 if (sense_data_len) {
1548 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1549 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1550 if (sense_data_len > max_sense_len) {
1551 pr_warn("truncated sense data from %d to %d"
1552 " bytes\n", sense_data_len, max_sense_len);
1553 sense_data_len = max_sense_len;
1556 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1557 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1558 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1561 return sizeof(*srp_rsp) + sense_data_len;
1565 * srpt_build_tskmgmt_rsp() - Build a task management response.
1566 * @ch: RDMA channel through which the request has been received.
1567 * @ioctx: I/O context in which the SRP_RSP response will be built.
1568 * @rsp_code: RSP_CODE that will be stored in the response.
1569 * @tag: Tag of the request for which this response is being generated.
1571 * Returns the size in bytes of the SRP_RSP response.
1573 * An SRP_RSP response contains a SCSI status or service response. See also
1574 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1577 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1578 struct srpt_send_ioctx *ioctx,
1579 u8 rsp_code, u64 tag)
1581 struct srp_rsp *srp_rsp;
1586 resp_len = sizeof(*srp_rsp) + resp_data_len;
1588 srp_rsp = ioctx->ioctx.buf;
1590 memset(srp_rsp, 0, sizeof *srp_rsp);
1592 srp_rsp->opcode = SRP_RSP;
1593 srp_rsp->req_lim_delta = __constant_cpu_to_be32(1
1594 + atomic_xchg(&ch->req_lim_delta, 0));
1597 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1598 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1599 srp_rsp->data[3] = rsp_code;
1604 #define NO_SUCH_LUN ((uint64_t)-1LL)
1607 * SCSI LUN addressing method. See also SAM-2 and the section about
1610 enum scsi_lun_addr_method {
1611 SCSI_LUN_ADDR_METHOD_PERIPHERAL = 0,
1612 SCSI_LUN_ADDR_METHOD_FLAT = 1,
1613 SCSI_LUN_ADDR_METHOD_LUN = 2,
1614 SCSI_LUN_ADDR_METHOD_EXTENDED_LUN = 3,
1618 * srpt_unpack_lun() - Convert from network LUN to linear LUN.
1620 * Convert an 2-byte, 4-byte, 6-byte or 8-byte LUN structure in network byte
1621 * order (big endian) to a linear LUN. Supports three LUN addressing methods:
1622 * peripheral, flat and logical unit. See also SAM-2, section 4.9.4 (page 40).
1624 static uint64_t srpt_unpack_lun(const uint8_t *lun, int len)
1626 uint64_t res = NO_SUCH_LUN;
1627 int addressing_method;
1629 if (unlikely(len < 2)) {
1630 pr_err("Illegal LUN length %d, expected 2 bytes or more\n",
1637 if ((*((__be64 *)lun) &
1638 __constant_cpu_to_be64(0x0000FFFFFFFFFFFFLL)) != 0)
1642 if (*((__be16 *)&lun[2]) != 0)
1646 if (*((__be32 *)&lun[2]) != 0)
1655 addressing_method = (*lun) >> 6; /* highest two bits of byte 0 */
1656 switch (addressing_method) {
1657 case SCSI_LUN_ADDR_METHOD_PERIPHERAL:
1658 case SCSI_LUN_ADDR_METHOD_FLAT:
1659 case SCSI_LUN_ADDR_METHOD_LUN:
1660 res = *(lun + 1) | (((*lun) & 0x3f) << 8);
1663 case SCSI_LUN_ADDR_METHOD_EXTENDED_LUN:
1665 pr_err("Unimplemented LUN addressing method %u\n",
1674 pr_err("Support for multi-level LUNs has not yet been implemented\n");
1678 static int srpt_check_stop_free(struct se_cmd *cmd)
1680 struct srpt_send_ioctx *ioctx = container_of(cmd,
1681 struct srpt_send_ioctx, cmd);
1683 return target_put_sess_cmd(ioctx->ch->sess, &ioctx->cmd);
1687 * srpt_handle_cmd() - Process SRP_CMD.
1689 static int srpt_handle_cmd(struct srpt_rdma_ch *ch,
1690 struct srpt_recv_ioctx *recv_ioctx,
1691 struct srpt_send_ioctx *send_ioctx)
1694 struct srp_cmd *srp_cmd;
1695 uint64_t unpacked_lun;
1697 enum dma_data_direction dir;
1701 BUG_ON(!send_ioctx);
1703 srp_cmd = recv_ioctx->ioctx.buf;
1704 cmd = &send_ioctx->cmd;
1705 send_ioctx->tag = srp_cmd->tag;
1707 switch (srp_cmd->task_attr) {
1708 case SRP_CMD_SIMPLE_Q:
1709 cmd->sam_task_attr = TCM_SIMPLE_TAG;
1711 case SRP_CMD_ORDERED_Q:
1713 cmd->sam_task_attr = TCM_ORDERED_TAG;
1715 case SRP_CMD_HEAD_OF_Q:
1716 cmd->sam_task_attr = TCM_HEAD_TAG;
1719 cmd->sam_task_attr = TCM_ACA_TAG;
1723 if (srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len)) {
1724 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1726 ret = TCM_INVALID_CDB_FIELD;
1730 unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_cmd->lun,
1731 sizeof(srp_cmd->lun));
1732 rc = target_submit_cmd(cmd, ch->sess, srp_cmd->cdb,
1733 &send_ioctx->sense_data[0], unpacked_lun, data_len,
1734 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF);
1736 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1742 transport_send_check_condition_and_sense(cmd, ret, 0);
1747 * srpt_rx_mgmt_fn_tag() - Process a task management function by tag.
1748 * @ch: RDMA channel of the task management request.
1749 * @fn: Task management function to perform.
1750 * @req_tag: Tag of the SRP task management request.
1751 * @mgmt_ioctx: I/O context of the task management request.
1753 * Returns zero if the target core will process the task management
1754 * request asynchronously.
1756 * Note: It is assumed that the initiator serializes tag-based task management
1759 static int srpt_rx_mgmt_fn_tag(struct srpt_send_ioctx *ioctx, u64 tag)
1761 struct srpt_device *sdev;
1762 struct srpt_rdma_ch *ch;
1763 struct srpt_send_ioctx *target;
1770 sdev = ch->sport->sdev;
1772 spin_lock_irq(&sdev->spinlock);
1773 for (i = 0; i < ch->rq_size; ++i) {
1774 target = ch->ioctx_ring[i];
1775 if (target->cmd.se_lun == ioctx->cmd.se_lun &&
1776 target->tag == tag &&
1777 srpt_get_cmd_state(target) != SRPT_STATE_DONE) {
1779 /* now let the target core abort &target->cmd; */
1783 spin_unlock_irq(&sdev->spinlock);
1787 static int srp_tmr_to_tcm(int fn)
1790 case SRP_TSK_ABORT_TASK:
1791 return TMR_ABORT_TASK;
1792 case SRP_TSK_ABORT_TASK_SET:
1793 return TMR_ABORT_TASK_SET;
1794 case SRP_TSK_CLEAR_TASK_SET:
1795 return TMR_CLEAR_TASK_SET;
1796 case SRP_TSK_LUN_RESET:
1797 return TMR_LUN_RESET;
1798 case SRP_TSK_CLEAR_ACA:
1799 return TMR_CLEAR_ACA;
1806 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1808 * Returns 0 if and only if the request will be processed by the target core.
1810 * For more information about SRP_TSK_MGMT information units, see also section
1811 * 6.7 in the SRP r16a document.
1813 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1814 struct srpt_recv_ioctx *recv_ioctx,
1815 struct srpt_send_ioctx *send_ioctx)
1817 struct srp_tsk_mgmt *srp_tsk;
1819 struct se_session *sess = ch->sess;
1820 uint64_t unpacked_lun;
1825 BUG_ON(!send_ioctx);
1827 srp_tsk = recv_ioctx->ioctx.buf;
1828 cmd = &send_ioctx->cmd;
1830 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1831 " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func,
1832 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
1834 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
1835 send_ioctx->tag = srp_tsk->tag;
1836 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
1838 send_ioctx->cmd.se_tmr_req->response =
1839 TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
1842 unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_tsk->lun,
1843 sizeof(srp_tsk->lun));
1845 if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK) {
1846 rc = srpt_rx_mgmt_fn_tag(send_ioctx, srp_tsk->task_tag);
1848 send_ioctx->cmd.se_tmr_req->response =
1849 TMR_TASK_DOES_NOT_EXIST;
1852 tag = srp_tsk->task_tag;
1854 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, unpacked_lun,
1855 srp_tsk, tcm_tmr, GFP_KERNEL, tag,
1856 TARGET_SCF_ACK_KREF);
1858 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
1863 transport_send_check_condition_and_sense(cmd, 0, 0); // XXX:
1867 * srpt_handle_new_iu() - Process a newly received information unit.
1868 * @ch: RDMA channel through which the information unit has been received.
1869 * @ioctx: SRPT I/O context associated with the information unit.
1871 static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
1872 struct srpt_recv_ioctx *recv_ioctx,
1873 struct srpt_send_ioctx *send_ioctx)
1875 struct srp_cmd *srp_cmd;
1876 enum rdma_ch_state ch_state;
1879 BUG_ON(!recv_ioctx);
1881 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1882 recv_ioctx->ioctx.dma, srp_max_req_size,
1885 ch_state = srpt_get_ch_state(ch);
1886 if (unlikely(ch_state == CH_CONNECTING)) {
1887 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1891 if (unlikely(ch_state != CH_LIVE))
1894 srp_cmd = recv_ioctx->ioctx.buf;
1895 if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
1897 send_ioctx = srpt_get_send_ioctx(ch);
1898 if (unlikely(!send_ioctx)) {
1899 list_add_tail(&recv_ioctx->wait_list,
1900 &ch->cmd_wait_list);
1905 switch (srp_cmd->opcode) {
1907 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1910 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1913 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1916 pr_debug("received SRP_CRED_RSP\n");
1919 pr_debug("received SRP_AER_RSP\n");
1922 pr_err("Received SRP_RSP\n");
1925 pr_err("received IU with unknown opcode 0x%x\n",
1930 srpt_post_recv(ch->sport->sdev, recv_ioctx);
1935 static void srpt_process_rcv_completion(struct ib_cq *cq,
1936 struct srpt_rdma_ch *ch,
1939 struct srpt_device *sdev = ch->sport->sdev;
1940 struct srpt_recv_ioctx *ioctx;
1943 index = idx_from_wr_id(wc->wr_id);
1944 if (wc->status == IB_WC_SUCCESS) {
1947 req_lim = atomic_dec_return(&ch->req_lim);
1948 if (unlikely(req_lim < 0))
1949 pr_err("req_lim = %d < 0\n", req_lim);
1950 ioctx = sdev->ioctx_ring[index];
1951 srpt_handle_new_iu(ch, ioctx, NULL);
1953 pr_info("receiving failed for idx %u with status %d\n",
1959 * srpt_process_send_completion() - Process an IB send completion.
1961 * Note: Although this has not yet been observed during tests, at least in
1962 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1963 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1964 * value in each response is set to one, and it is possible that this response
1965 * makes the initiator send a new request before the send completion for that
1966 * response has been processed. This could e.g. happen if the call to
1967 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1968 * if IB retransmission causes generation of the send completion to be
1969 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1970 * are queued on cmd_wait_list. The code below processes these delayed
1971 * requests one at a time.
1973 static void srpt_process_send_completion(struct ib_cq *cq,
1974 struct srpt_rdma_ch *ch,
1977 struct srpt_send_ioctx *send_ioctx;
1979 enum srpt_opcode opcode;
1981 index = idx_from_wr_id(wc->wr_id);
1982 opcode = opcode_from_wr_id(wc->wr_id);
1983 send_ioctx = ch->ioctx_ring[index];
1984 if (wc->status == IB_WC_SUCCESS) {
1985 if (opcode == SRPT_SEND)
1986 srpt_handle_send_comp(ch, send_ioctx);
1988 WARN_ON(opcode != SRPT_RDMA_ABORT &&
1989 wc->opcode != IB_WC_RDMA_READ);
1990 srpt_handle_rdma_comp(ch, send_ioctx, opcode);
1993 if (opcode == SRPT_SEND) {
1994 pr_info("sending response for idx %u failed"
1995 " with status %d\n", index, wc->status);
1996 srpt_handle_send_err_comp(ch, wc->wr_id);
1997 } else if (opcode != SRPT_RDMA_MID) {
1998 pr_info("RDMA t %d for idx %u failed with"
1999 " status %d\n", opcode, index, wc->status);
2000 srpt_handle_rdma_err_comp(ch, send_ioctx, opcode);
2004 while (unlikely(opcode == SRPT_SEND
2005 && !list_empty(&ch->cmd_wait_list)
2006 && srpt_get_ch_state(ch) == CH_LIVE
2007 && (send_ioctx = srpt_get_send_ioctx(ch)) != NULL)) {
2008 struct srpt_recv_ioctx *recv_ioctx;
2010 recv_ioctx = list_first_entry(&ch->cmd_wait_list,
2011 struct srpt_recv_ioctx,
2013 list_del(&recv_ioctx->wait_list);
2014 srpt_handle_new_iu(ch, recv_ioctx, send_ioctx);
2018 static void srpt_process_completion(struct ib_cq *cq, struct srpt_rdma_ch *ch)
2020 struct ib_wc *const wc = ch->wc;
2023 WARN_ON(cq != ch->cq);
2025 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
2026 while ((n = ib_poll_cq(cq, ARRAY_SIZE(ch->wc), wc)) > 0) {
2027 for (i = 0; i < n; i++) {
2028 if (opcode_from_wr_id(wc[i].wr_id) == SRPT_RECV)
2029 srpt_process_rcv_completion(cq, ch, &wc[i]);
2031 srpt_process_send_completion(cq, ch, &wc[i]);
2037 * srpt_completion() - IB completion queue callback function.
2040 * - It is guaranteed that a completion handler will never be invoked
2041 * concurrently on two different CPUs for the same completion queue. See also
2042 * Documentation/infiniband/core_locking.txt and the implementation of
2043 * handle_edge_irq() in kernel/irq/chip.c.
2044 * - When threaded IRQs are enabled, completion handlers are invoked in thread
2045 * context instead of interrupt context.
2047 static void srpt_completion(struct ib_cq *cq, void *ctx)
2049 struct srpt_rdma_ch *ch = ctx;
2051 wake_up_interruptible(&ch->wait_queue);
2054 static int srpt_compl_thread(void *arg)
2056 struct srpt_rdma_ch *ch;
2058 /* Hibernation / freezing of the SRPT kernel thread is not supported. */
2059 current->flags |= PF_NOFREEZE;
2063 pr_info("Session %s: kernel thread %s (PID %d) started\n",
2064 ch->sess_name, ch->thread->comm, current->pid);
2065 while (!kthread_should_stop()) {
2066 wait_event_interruptible(ch->wait_queue,
2067 (srpt_process_completion(ch->cq, ch),
2068 kthread_should_stop()));
2070 pr_info("Session %s: kernel thread %s (PID %d) stopped\n",
2071 ch->sess_name, ch->thread->comm, current->pid);
2076 * srpt_create_ch_ib() - Create receive and send completion queues.
2078 static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
2080 struct ib_qp_init_attr *qp_init;
2081 struct srpt_port *sport = ch->sport;
2082 struct srpt_device *sdev = sport->sdev;
2083 u32 srp_sq_size = sport->port_attrib.srp_sq_size;
2086 WARN_ON(ch->rq_size < 1);
2089 qp_init = kzalloc(sizeof *qp_init, GFP_KERNEL);
2094 ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch,
2095 ch->rq_size + srp_sq_size, 0);
2096 if (IS_ERR(ch->cq)) {
2097 ret = PTR_ERR(ch->cq);
2098 pr_err("failed to create CQ cqe= %d ret= %d\n",
2099 ch->rq_size + srp_sq_size, ret);
2103 qp_init->qp_context = (void *)ch;
2104 qp_init->event_handler
2105 = (void(*)(struct ib_event *, void*))srpt_qp_event;
2106 qp_init->send_cq = ch->cq;
2107 qp_init->recv_cq = ch->cq;
2108 qp_init->srq = sdev->srq;
2109 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
2110 qp_init->qp_type = IB_QPT_RC;
2111 qp_init->cap.max_send_wr = srp_sq_size;
2112 qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE;
2114 ch->qp = ib_create_qp(sdev->pd, qp_init);
2115 if (IS_ERR(ch->qp)) {
2116 ret = PTR_ERR(ch->qp);
2117 if (ret == -ENOMEM) {
2119 if (srp_sq_size >= MIN_SRPT_SQ_SIZE) {
2120 ib_destroy_cq(ch->cq);
2124 pr_err("failed to create_qp ret= %d\n", ret);
2125 goto err_destroy_cq;
2128 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
2130 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
2131 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
2132 qp_init->cap.max_send_wr, ch->cm_id);
2134 ret = srpt_init_ch_qp(ch, ch->qp);
2136 goto err_destroy_qp;
2138 init_waitqueue_head(&ch->wait_queue);
2140 pr_debug("creating thread for session %s\n", ch->sess_name);
2142 ch->thread = kthread_run(srpt_compl_thread, ch, "ib_srpt_compl");
2143 if (IS_ERR(ch->thread)) {
2144 pr_err("failed to create kernel thread %ld\n",
2145 PTR_ERR(ch->thread));
2147 goto err_destroy_qp;
2155 ib_destroy_qp(ch->qp);
2157 ib_destroy_cq(ch->cq);
2161 static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
2164 kthread_stop(ch->thread);
2166 ib_destroy_qp(ch->qp);
2167 ib_destroy_cq(ch->cq);
2171 * __srpt_close_ch() - Close an RDMA channel by setting the QP error state.
2173 * Reset the QP and make sure all resources associated with the channel will
2174 * be deallocated at an appropriate time.
2176 * Note: The caller must hold ch->sport->sdev->spinlock.
2178 static void __srpt_close_ch(struct srpt_rdma_ch *ch)
2180 struct srpt_device *sdev;
2181 enum rdma_ch_state prev_state;
2182 unsigned long flags;
2184 sdev = ch->sport->sdev;
2186 spin_lock_irqsave(&ch->spinlock, flags);
2187 prev_state = ch->state;
2188 switch (prev_state) {
2191 ch->state = CH_DISCONNECTING;
2196 spin_unlock_irqrestore(&ch->spinlock, flags);
2198 switch (prev_state) {
2200 ib_send_cm_rej(ch->cm_id, IB_CM_REJ_NO_RESOURCES, NULL, 0,
2204 if (ib_send_cm_dreq(ch->cm_id, NULL, 0) < 0)
2205 pr_err("sending CM DREQ failed.\n");
2207 case CH_DISCONNECTING:
2216 * srpt_close_ch() - Close an RDMA channel.
2218 static void srpt_close_ch(struct srpt_rdma_ch *ch)
2220 struct srpt_device *sdev;
2222 sdev = ch->sport->sdev;
2223 spin_lock_irq(&sdev->spinlock);
2224 __srpt_close_ch(ch);
2225 spin_unlock_irq(&sdev->spinlock);
2229 * srpt_shutdown_session() - Whether or not a session may be shut down.
2231 static int srpt_shutdown_session(struct se_session *se_sess)
2233 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
2234 unsigned long flags;
2236 spin_lock_irqsave(&ch->spinlock, flags);
2237 if (ch->in_shutdown) {
2238 spin_unlock_irqrestore(&ch->spinlock, flags);
2242 ch->in_shutdown = true;
2243 target_sess_cmd_list_set_waiting(se_sess);
2244 spin_unlock_irqrestore(&ch->spinlock, flags);
2250 * srpt_drain_channel() - Drain a channel by resetting the IB queue pair.
2251 * @cm_id: Pointer to the CM ID of the channel to be drained.
2253 * Note: Must be called from inside srpt_cm_handler to avoid a race between
2254 * accessing sdev->spinlock and the call to kfree(sdev) in srpt_remove_one()
2255 * (the caller of srpt_cm_handler holds the cm_id spinlock; srpt_remove_one()
2256 * waits until all target sessions for the associated IB device have been
2257 * unregistered and target session registration involves a call to
2258 * ib_destroy_cm_id(), which locks the cm_id spinlock and hence waits until
2259 * this function has finished).
2261 static void srpt_drain_channel(struct ib_cm_id *cm_id)
2263 struct srpt_device *sdev;
2264 struct srpt_rdma_ch *ch;
2266 bool do_reset = false;
2268 WARN_ON_ONCE(irqs_disabled());
2270 sdev = cm_id->context;
2272 spin_lock_irq(&sdev->spinlock);
2273 list_for_each_entry(ch, &sdev->rch_list, list) {
2274 if (ch->cm_id == cm_id) {
2275 do_reset = srpt_test_and_set_ch_state(ch,
2276 CH_CONNECTING, CH_DRAINING) ||
2277 srpt_test_and_set_ch_state(ch,
2278 CH_LIVE, CH_DRAINING) ||
2279 srpt_test_and_set_ch_state(ch,
2280 CH_DISCONNECTING, CH_DRAINING);
2284 spin_unlock_irq(&sdev->spinlock);
2288 srpt_shutdown_session(ch->sess);
2290 ret = srpt_ch_qp_err(ch);
2292 pr_err("Setting queue pair in error state"
2293 " failed: %d\n", ret);
2298 * srpt_find_channel() - Look up an RDMA channel.
2299 * @cm_id: Pointer to the CM ID of the channel to be looked up.
2301 * Return NULL if no matching RDMA channel has been found.
2303 static struct srpt_rdma_ch *srpt_find_channel(struct srpt_device *sdev,
2304 struct ib_cm_id *cm_id)
2306 struct srpt_rdma_ch *ch;
2309 WARN_ON_ONCE(irqs_disabled());
2313 spin_lock_irq(&sdev->spinlock);
2314 list_for_each_entry(ch, &sdev->rch_list, list) {
2315 if (ch->cm_id == cm_id) {
2320 spin_unlock_irq(&sdev->spinlock);
2322 return found ? ch : NULL;
2326 * srpt_release_channel() - Release channel resources.
2328 * Schedules the actual release because:
2329 * - Calling the ib_destroy_cm_id() call from inside an IB CM callback would
2330 * trigger a deadlock.
2331 * - It is not safe to call TCM transport_* functions from interrupt context.
2333 static void srpt_release_channel(struct srpt_rdma_ch *ch)
2335 schedule_work(&ch->release_work);
2338 static void srpt_release_channel_work(struct work_struct *w)
2340 struct srpt_rdma_ch *ch;
2341 struct srpt_device *sdev;
2342 struct se_session *se_sess;
2344 ch = container_of(w, struct srpt_rdma_ch, release_work);
2345 pr_debug("ch = %p; ch->sess = %p; release_done = %p\n", ch, ch->sess,
2348 sdev = ch->sport->sdev;
2354 target_wait_for_sess_cmds(se_sess);
2356 transport_deregister_session_configfs(se_sess);
2357 transport_deregister_session(se_sess);
2360 ib_destroy_cm_id(ch->cm_id);
2362 srpt_destroy_ch_ib(ch);
2364 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2365 ch->sport->sdev, ch->rq_size,
2366 ch->rsp_size, DMA_TO_DEVICE);
2368 spin_lock_irq(&sdev->spinlock);
2369 list_del(&ch->list);
2370 spin_unlock_irq(&sdev->spinlock);
2372 if (ch->release_done)
2373 complete(ch->release_done);
2375 wake_up(&sdev->ch_releaseQ);
2380 static struct srpt_node_acl *__srpt_lookup_acl(struct srpt_port *sport,
2383 struct srpt_node_acl *nacl;
2385 list_for_each_entry(nacl, &sport->port_acl_list, list)
2386 if (memcmp(nacl->i_port_id, i_port_id,
2387 sizeof(nacl->i_port_id)) == 0)
2393 static struct srpt_node_acl *srpt_lookup_acl(struct srpt_port *sport,
2396 struct srpt_node_acl *nacl;
2398 spin_lock_irq(&sport->port_acl_lock);
2399 nacl = __srpt_lookup_acl(sport, i_port_id);
2400 spin_unlock_irq(&sport->port_acl_lock);
2406 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
2408 * Ownership of the cm_id is transferred to the target session if this
2409 * functions returns zero. Otherwise the caller remains the owner of cm_id.
2411 static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
2412 struct ib_cm_req_event_param *param,
2415 struct srpt_device *sdev = cm_id->context;
2416 struct srpt_port *sport = &sdev->port[param->port - 1];
2417 struct srp_login_req *req;
2418 struct srp_login_rsp *rsp;
2419 struct srp_login_rej *rej;
2420 struct ib_cm_rep_param *rep_param;
2421 struct srpt_rdma_ch *ch, *tmp_ch;
2422 struct srpt_node_acl *nacl;
2427 WARN_ON_ONCE(irqs_disabled());
2429 if (WARN_ON(!sdev || !private_data))
2432 req = (struct srp_login_req *)private_data;
2434 it_iu_len = be32_to_cpu(req->req_it_iu_len);
2436 pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
2437 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
2438 " (guid=0x%llx:0x%llx)\n",
2439 be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
2440 be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
2441 be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
2442 be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
2445 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
2446 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
2448 rsp = kzalloc(sizeof *rsp, GFP_KERNEL);
2449 rej = kzalloc(sizeof *rej, GFP_KERNEL);
2450 rep_param = kzalloc(sizeof *rep_param, GFP_KERNEL);
2452 if (!rsp || !rej || !rep_param) {
2457 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
2458 rej->reason = __constant_cpu_to_be32(
2459 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
2461 pr_err("rejected SRP_LOGIN_REQ because its"
2462 " length (%d bytes) is out of range (%d .. %d)\n",
2463 it_iu_len, 64, srp_max_req_size);
2467 if (!sport->enabled) {
2468 rej->reason = __constant_cpu_to_be32(
2469 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2471 pr_err("rejected SRP_LOGIN_REQ because the target port"
2472 " has not yet been enabled\n");
2476 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
2477 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
2479 spin_lock_irq(&sdev->spinlock);
2481 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
2482 if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
2483 && !memcmp(ch->t_port_id, req->target_port_id, 16)
2484 && param->port == ch->sport->port
2485 && param->listen_id == ch->sport->sdev->cm_id
2487 enum rdma_ch_state ch_state;
2489 ch_state = srpt_get_ch_state(ch);
2490 if (ch_state != CH_CONNECTING
2491 && ch_state != CH_LIVE)
2494 /* found an existing channel */
2495 pr_debug("Found existing channel %s"
2496 " cm_id= %p state= %d\n",
2497 ch->sess_name, ch->cm_id, ch_state);
2499 __srpt_close_ch(ch);
2502 SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
2506 spin_unlock_irq(&sdev->spinlock);
2509 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
2511 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
2512 || *(__be64 *)(req->target_port_id + 8) !=
2513 cpu_to_be64(srpt_service_guid)) {
2514 rej->reason = __constant_cpu_to_be32(
2515 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
2517 pr_err("rejected SRP_LOGIN_REQ because it"
2518 " has an invalid target port identifier.\n");
2522 ch = kzalloc(sizeof *ch, GFP_KERNEL);
2524 rej->reason = __constant_cpu_to_be32(
2525 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2526 pr_err("rejected SRP_LOGIN_REQ because no memory.\n");
2531 INIT_WORK(&ch->release_work, srpt_release_channel_work);
2532 memcpy(ch->i_port_id, req->initiator_port_id, 16);
2533 memcpy(ch->t_port_id, req->target_port_id, 16);
2534 ch->sport = &sdev->port[param->port - 1];
2537 * Avoid QUEUE_FULL conditions by limiting the number of buffers used
2538 * for the SRP protocol to the command queue size.
2540 ch->rq_size = SRPT_RQ_SIZE;
2541 spin_lock_init(&ch->spinlock);
2542 ch->state = CH_CONNECTING;
2543 INIT_LIST_HEAD(&ch->cmd_wait_list);
2544 ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
2546 ch->ioctx_ring = (struct srpt_send_ioctx **)
2547 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2548 sizeof(*ch->ioctx_ring[0]),
2549 ch->rsp_size, DMA_TO_DEVICE);
2550 if (!ch->ioctx_ring)
2553 INIT_LIST_HEAD(&ch->free_list);
2554 for (i = 0; i < ch->rq_size; i++) {
2555 ch->ioctx_ring[i]->ch = ch;
2556 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
2559 ret = srpt_create_ch_ib(ch);
2561 rej->reason = __constant_cpu_to_be32(
2562 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2563 pr_err("rejected SRP_LOGIN_REQ because creating"
2564 " a new RDMA channel failed.\n");
2568 ret = srpt_ch_qp_rtr(ch, ch->qp);
2570 rej->reason = __constant_cpu_to_be32(
2571 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2572 pr_err("rejected SRP_LOGIN_REQ because enabling"
2573 " RTR failed (error code = %d)\n", ret);
2577 * Use the initator port identifier as the session name.
2579 snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx",
2580 be64_to_cpu(*(__be64 *)ch->i_port_id),
2581 be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
2583 pr_debug("registering session %s\n", ch->sess_name);
2585 nacl = srpt_lookup_acl(sport, ch->i_port_id);
2587 pr_info("Rejected login because no ACL has been"
2588 " configured yet for initiator %s.\n", ch->sess_name);
2589 rej->reason = __constant_cpu_to_be32(
2590 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2594 ch->sess = transport_init_session(TARGET_PROT_NORMAL);
2595 if (IS_ERR(ch->sess)) {
2596 rej->reason = __constant_cpu_to_be32(
2597 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2598 pr_debug("Failed to create session\n");
2599 goto deregister_session;
2601 ch->sess->se_node_acl = &nacl->nacl;
2602 transport_register_session(&sport->port_tpg_1, &nacl->nacl, ch->sess, ch);
2604 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess,
2605 ch->sess_name, ch->cm_id);
2607 /* create srp_login_response */
2608 rsp->opcode = SRP_LOGIN_RSP;
2609 rsp->tag = req->tag;
2610 rsp->max_it_iu_len = req->req_it_iu_len;
2611 rsp->max_ti_iu_len = req->req_it_iu_len;
2612 ch->max_ti_iu_len = it_iu_len;
2613 rsp->buf_fmt = __constant_cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2614 | SRP_BUF_FORMAT_INDIRECT);
2615 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2616 atomic_set(&ch->req_lim, ch->rq_size);
2617 atomic_set(&ch->req_lim_delta, 0);
2619 /* create cm reply */
2620 rep_param->qp_num = ch->qp->qp_num;
2621 rep_param->private_data = (void *)rsp;
2622 rep_param->private_data_len = sizeof *rsp;
2623 rep_param->rnr_retry_count = 7;
2624 rep_param->flow_control = 1;
2625 rep_param->failover_accepted = 0;
2627 rep_param->responder_resources = 4;
2628 rep_param->initiator_depth = 4;
2630 ret = ib_send_cm_rep(cm_id, rep_param);
2632 pr_err("sending SRP_LOGIN_REQ response failed"
2633 " (error code = %d)\n", ret);
2634 goto release_channel;
2637 spin_lock_irq(&sdev->spinlock);
2638 list_add_tail(&ch->list, &sdev->rch_list);
2639 spin_unlock_irq(&sdev->spinlock);
2644 srpt_set_ch_state(ch, CH_RELEASING);
2645 transport_deregister_session_configfs(ch->sess);
2648 transport_deregister_session(ch->sess);
2652 srpt_destroy_ch_ib(ch);
2655 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2656 ch->sport->sdev, ch->rq_size,
2657 ch->rsp_size, DMA_TO_DEVICE);
2662 rej->opcode = SRP_LOGIN_REJ;
2663 rej->tag = req->tag;
2664 rej->buf_fmt = __constant_cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2665 | SRP_BUF_FORMAT_INDIRECT);
2667 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2668 (void *)rej, sizeof *rej);
2678 static void srpt_cm_rej_recv(struct ib_cm_id *cm_id)
2680 pr_info("Received IB REJ for cm_id %p.\n", cm_id);
2681 srpt_drain_channel(cm_id);
2685 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2687 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2688 * and that the recipient may begin transmitting (RTU = ready to use).
2690 static void srpt_cm_rtu_recv(struct ib_cm_id *cm_id)
2692 struct srpt_rdma_ch *ch;
2695 ch = srpt_find_channel(cm_id->context, cm_id);
2698 if (srpt_test_and_set_ch_state(ch, CH_CONNECTING, CH_LIVE)) {
2699 struct srpt_recv_ioctx *ioctx, *ioctx_tmp;
2701 ret = srpt_ch_qp_rts(ch, ch->qp);
2703 list_for_each_entry_safe(ioctx, ioctx_tmp, &ch->cmd_wait_list,
2705 list_del(&ioctx->wait_list);
2706 srpt_handle_new_iu(ch, ioctx, NULL);
2713 static void srpt_cm_timewait_exit(struct ib_cm_id *cm_id)
2715 pr_info("Received IB TimeWait exit for cm_id %p.\n", cm_id);
2716 srpt_drain_channel(cm_id);
2719 static void srpt_cm_rep_error(struct ib_cm_id *cm_id)
2721 pr_info("Received IB REP error for cm_id %p.\n", cm_id);
2722 srpt_drain_channel(cm_id);
2726 * srpt_cm_dreq_recv() - Process reception of a DREQ message.
2728 static void srpt_cm_dreq_recv(struct ib_cm_id *cm_id)
2730 struct srpt_rdma_ch *ch;
2731 unsigned long flags;
2732 bool send_drep = false;
2734 ch = srpt_find_channel(cm_id->context, cm_id);
2737 pr_debug("cm_id= %p ch->state= %d\n", cm_id, srpt_get_ch_state(ch));
2739 spin_lock_irqsave(&ch->spinlock, flags);
2740 switch (ch->state) {
2744 ch->state = CH_DISCONNECTING;
2746 case CH_DISCONNECTING:
2749 WARN(true, "unexpected channel state %d\n", ch->state);
2752 spin_unlock_irqrestore(&ch->spinlock, flags);
2755 if (ib_send_cm_drep(ch->cm_id, NULL, 0) < 0)
2756 pr_err("Sending IB DREP failed.\n");
2757 pr_info("Received DREQ and sent DREP for session %s.\n",
2763 * srpt_cm_drep_recv() - Process reception of a DREP message.
2765 static void srpt_cm_drep_recv(struct ib_cm_id *cm_id)
2767 pr_info("Received InfiniBand DREP message for cm_id %p.\n", cm_id);
2768 srpt_drain_channel(cm_id);
2772 * srpt_cm_handler() - IB connection manager callback function.
2774 * A non-zero return value will cause the caller destroy the CM ID.
2776 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2777 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2778 * a non-zero value in any other case will trigger a race with the
2779 * ib_destroy_cm_id() call in srpt_release_channel().
2781 static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2786 switch (event->event) {
2787 case IB_CM_REQ_RECEIVED:
2788 ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
2789 event->private_data);
2791 case IB_CM_REJ_RECEIVED:
2792 srpt_cm_rej_recv(cm_id);
2794 case IB_CM_RTU_RECEIVED:
2795 case IB_CM_USER_ESTABLISHED:
2796 srpt_cm_rtu_recv(cm_id);
2798 case IB_CM_DREQ_RECEIVED:
2799 srpt_cm_dreq_recv(cm_id);
2801 case IB_CM_DREP_RECEIVED:
2802 srpt_cm_drep_recv(cm_id);
2804 case IB_CM_TIMEWAIT_EXIT:
2805 srpt_cm_timewait_exit(cm_id);
2807 case IB_CM_REP_ERROR:
2808 srpt_cm_rep_error(cm_id);
2810 case IB_CM_DREQ_ERROR:
2811 pr_info("Received IB DREQ ERROR event.\n");
2813 case IB_CM_MRA_RECEIVED:
2814 pr_info("Received IB MRA event\n");
2817 pr_err("received unrecognized IB CM event %d\n", event->event);
2825 * srpt_perform_rdmas() - Perform IB RDMA.
2827 * Returns zero upon success or a negative number upon failure.
2829 static int srpt_perform_rdmas(struct srpt_rdma_ch *ch,
2830 struct srpt_send_ioctx *ioctx)
2832 struct ib_send_wr wr;
2833 struct ib_send_wr *bad_wr;
2834 struct rdma_iu *riu;
2838 enum dma_data_direction dir;
2839 const int n_rdma = ioctx->n_rdma;
2841 dir = ioctx->cmd.data_direction;
2842 if (dir == DMA_TO_DEVICE) {
2845 sq_wr_avail = atomic_sub_return(n_rdma, &ch->sq_wr_avail);
2846 if (sq_wr_avail < 0) {
2847 pr_warn("IB send queue full (needed %d)\n",
2853 ioctx->rdma_aborted = false;
2855 riu = ioctx->rdma_ius;
2856 memset(&wr, 0, sizeof wr);
2858 for (i = 0; i < n_rdma; ++i, ++riu) {
2859 if (dir == DMA_FROM_DEVICE) {
2860 wr.opcode = IB_WR_RDMA_WRITE;
2861 wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
2862 SRPT_RDMA_WRITE_LAST :
2864 ioctx->ioctx.index);
2866 wr.opcode = IB_WR_RDMA_READ;
2867 wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
2868 SRPT_RDMA_READ_LAST :
2870 ioctx->ioctx.index);
2873 wr.wr.rdma.remote_addr = riu->raddr;
2874 wr.wr.rdma.rkey = riu->rkey;
2875 wr.num_sge = riu->sge_cnt;
2876 wr.sg_list = riu->sge;
2878 /* only get completion event for the last rdma write */
2879 if (i == (n_rdma - 1) && dir == DMA_TO_DEVICE)
2880 wr.send_flags = IB_SEND_SIGNALED;
2882 ret = ib_post_send(ch->qp, &wr, &bad_wr);
2888 pr_err("%s[%d]: ib_post_send() returned %d for %d/%d\n",
2889 __func__, __LINE__, ret, i, n_rdma);
2892 wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index);
2893 wr.send_flags = IB_SEND_SIGNALED;
2894 while (ch->state == CH_LIVE &&
2895 ib_post_send(ch->qp, &wr, &bad_wr) != 0) {
2896 pr_info("Trying to abort failed RDMA transfer [%d]\n",
2897 ioctx->ioctx.index);
2900 while (ch->state != CH_RELEASING && !ioctx->rdma_aborted) {
2901 pr_info("Waiting until RDMA abort finished [%d]\n",
2902 ioctx->ioctx.index);
2907 if (unlikely(dir == DMA_TO_DEVICE && ret < 0))
2908 atomic_add(n_rdma, &ch->sq_wr_avail);
2913 * srpt_xfer_data() - Start data transfer from initiator to target.
2915 static int srpt_xfer_data(struct srpt_rdma_ch *ch,
2916 struct srpt_send_ioctx *ioctx)
2920 ret = srpt_map_sg_to_ib_sge(ch, ioctx);
2922 pr_err("%s[%d] ret=%d\n", __func__, __LINE__, ret);
2926 ret = srpt_perform_rdmas(ch, ioctx);
2928 if (ret == -EAGAIN || ret == -ENOMEM)
2929 pr_info("%s[%d] queue full -- ret=%d\n",
2930 __func__, __LINE__, ret);
2932 pr_err("%s[%d] fatal error -- ret=%d\n",
2933 __func__, __LINE__, ret);
2940 srpt_unmap_sg_to_ib_sge(ch, ioctx);
2944 static int srpt_write_pending_status(struct se_cmd *se_cmd)
2946 struct srpt_send_ioctx *ioctx;
2948 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2949 return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA;
2953 * srpt_write_pending() - Start data transfer from initiator to target (write).
2955 static int srpt_write_pending(struct se_cmd *se_cmd)
2957 struct srpt_rdma_ch *ch;
2958 struct srpt_send_ioctx *ioctx;
2959 enum srpt_command_state new_state;
2960 enum rdma_ch_state ch_state;
2963 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2965 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2966 WARN_ON(new_state == SRPT_STATE_DONE);
2971 ch_state = srpt_get_ch_state(ch);
2974 WARN(true, "unexpected channel state %d\n", ch_state);
2979 case CH_DISCONNECTING:
2982 pr_debug("cmd with tag %lld: channel disconnecting\n",
2984 srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
2988 ret = srpt_xfer_data(ch, ioctx);
2994 static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2996 switch (tcm_mgmt_status) {
2997 case TMR_FUNCTION_COMPLETE:
2998 return SRP_TSK_MGMT_SUCCESS;
2999 case TMR_FUNCTION_REJECTED:
3000 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
3002 return SRP_TSK_MGMT_FAILED;
3006 * srpt_queue_response() - Transmits the response to a SCSI command.
3008 * Callback function called by the TCM core. Must not block since it can be
3009 * invoked on the context of the IB completion handler.
3011 static void srpt_queue_response(struct se_cmd *cmd)
3013 struct srpt_rdma_ch *ch;
3014 struct srpt_send_ioctx *ioctx;
3015 enum srpt_command_state state;
3016 unsigned long flags;
3018 enum dma_data_direction dir;
3022 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
3026 spin_lock_irqsave(&ioctx->spinlock, flags);
3027 state = ioctx->state;
3029 case SRPT_STATE_NEW:
3030 case SRPT_STATE_DATA_IN:
3031 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
3033 case SRPT_STATE_MGMT:
3034 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
3037 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
3038 ch, ioctx->ioctx.index, ioctx->state);
3041 spin_unlock_irqrestore(&ioctx->spinlock, flags);
3043 if (unlikely(transport_check_aborted_status(&ioctx->cmd, false)
3044 || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) {
3045 atomic_inc(&ch->req_lim_delta);
3046 srpt_abort_cmd(ioctx);
3050 dir = ioctx->cmd.data_direction;
3052 /* For read commands, transfer the data to the initiator. */
3053 if (dir == DMA_FROM_DEVICE && ioctx->cmd.data_length &&
3054 !ioctx->queue_status_only) {
3055 ret = srpt_xfer_data(ch, ioctx);
3057 pr_err("xfer_data failed for tag %llu\n",
3063 if (state != SRPT_STATE_MGMT)
3064 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->tag,
3068 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
3069 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
3072 ret = srpt_post_send(ch, ioctx, resp_len);
3074 pr_err("sending cmd response failed for tag %llu\n",
3076 srpt_unmap_sg_to_ib_sge(ch, ioctx);
3077 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
3078 target_put_sess_cmd(ioctx->ch->sess, &ioctx->cmd);
3082 static int srpt_queue_data_in(struct se_cmd *cmd)
3084 srpt_queue_response(cmd);
3088 static void srpt_queue_tm_rsp(struct se_cmd *cmd)
3090 srpt_queue_response(cmd);
3093 static void srpt_aborted_task(struct se_cmd *cmd)
3095 struct srpt_send_ioctx *ioctx = container_of(cmd,
3096 struct srpt_send_ioctx, cmd);
3098 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
3101 static int srpt_queue_status(struct se_cmd *cmd)
3103 struct srpt_send_ioctx *ioctx;
3105 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
3106 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
3107 if (cmd->se_cmd_flags &
3108 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
3109 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
3110 ioctx->queue_status_only = true;
3111 srpt_queue_response(cmd);
3115 static void srpt_refresh_port_work(struct work_struct *work)
3117 struct srpt_port *sport = container_of(work, struct srpt_port, work);
3119 srpt_refresh_port(sport);
3122 static int srpt_ch_list_empty(struct srpt_device *sdev)
3126 spin_lock_irq(&sdev->spinlock);
3127 res = list_empty(&sdev->rch_list);
3128 spin_unlock_irq(&sdev->spinlock);
3134 * srpt_release_sdev() - Free the channel resources associated with a target.
3136 static int srpt_release_sdev(struct srpt_device *sdev)
3138 struct srpt_rdma_ch *ch, *tmp_ch;
3141 WARN_ON_ONCE(irqs_disabled());
3145 spin_lock_irq(&sdev->spinlock);
3146 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list)
3147 __srpt_close_ch(ch);
3148 spin_unlock_irq(&sdev->spinlock);
3150 res = wait_event_interruptible(sdev->ch_releaseQ,
3151 srpt_ch_list_empty(sdev));
3153 pr_err("%s: interrupted.\n", __func__);
3158 static struct srpt_port *__srpt_lookup_port(const char *name)
3160 struct ib_device *dev;
3161 struct srpt_device *sdev;
3162 struct srpt_port *sport;
3165 list_for_each_entry(sdev, &srpt_dev_list, list) {
3170 for (i = 0; i < dev->phys_port_cnt; i++) {
3171 sport = &sdev->port[i];
3173 if (!strcmp(sport->port_guid, name))
3181 static struct srpt_port *srpt_lookup_port(const char *name)
3183 struct srpt_port *sport;
3185 spin_lock(&srpt_dev_lock);
3186 sport = __srpt_lookup_port(name);
3187 spin_unlock(&srpt_dev_lock);
3193 * srpt_add_one() - Infiniband device addition callback function.
3195 static void srpt_add_one(struct ib_device *device)
3197 struct srpt_device *sdev;
3198 struct srpt_port *sport;
3199 struct ib_srq_init_attr srq_attr;
3202 pr_debug("device = %p, device->dma_ops = %p\n", device,
3205 sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
3209 sdev->device = device;
3210 INIT_LIST_HEAD(&sdev->rch_list);
3211 init_waitqueue_head(&sdev->ch_releaseQ);
3212 spin_lock_init(&sdev->spinlock);
3214 if (ib_query_device(device, &sdev->dev_attr))
3217 sdev->pd = ib_alloc_pd(device);
3218 if (IS_ERR(sdev->pd))
3221 sdev->mr = ib_get_dma_mr(sdev->pd, IB_ACCESS_LOCAL_WRITE);
3222 if (IS_ERR(sdev->mr))
3225 sdev->srq_size = min(srpt_srq_size, sdev->dev_attr.max_srq_wr);
3227 srq_attr.event_handler = srpt_srq_event;
3228 srq_attr.srq_context = (void *)sdev;
3229 srq_attr.attr.max_wr = sdev->srq_size;
3230 srq_attr.attr.max_sge = 1;
3231 srq_attr.attr.srq_limit = 0;
3232 srq_attr.srq_type = IB_SRQT_BASIC;
3234 sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
3235 if (IS_ERR(sdev->srq))
3238 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
3239 __func__, sdev->srq_size, sdev->dev_attr.max_srq_wr,
3242 if (!srpt_service_guid)
3243 srpt_service_guid = be64_to_cpu(device->node_guid);
3245 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
3246 if (IS_ERR(sdev->cm_id))
3249 /* print out target login information */
3250 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
3251 "pkey=ffff,service_id=%016llx\n", srpt_service_guid,
3252 srpt_service_guid, srpt_service_guid);
3255 * We do not have a consistent service_id (ie. also id_ext of target_id)
3256 * to identify this target. We currently use the guid of the first HCA
3257 * in the system as service_id; therefore, the target_id will change
3258 * if this HCA is gone bad and replaced by different HCA
3260 if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0, NULL))
3263 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
3264 srpt_event_handler);
3265 if (ib_register_event_handler(&sdev->event_handler))
3268 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
3269 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
3270 sizeof(*sdev->ioctx_ring[0]),
3271 srp_max_req_size, DMA_FROM_DEVICE);
3272 if (!sdev->ioctx_ring)
3275 for (i = 0; i < sdev->srq_size; ++i)
3276 srpt_post_recv(sdev, sdev->ioctx_ring[i]);
3278 WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
3280 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
3281 sport = &sdev->port[i - 1];
3284 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
3285 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
3286 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
3287 INIT_WORK(&sport->work, srpt_refresh_port_work);
3288 INIT_LIST_HEAD(&sport->port_acl_list);
3289 spin_lock_init(&sport->port_acl_lock);
3291 if (srpt_refresh_port(sport)) {
3292 pr_err("MAD registration failed for %s-%d.\n",
3293 srpt_sdev_name(sdev), i);
3296 snprintf(sport->port_guid, sizeof(sport->port_guid),
3298 be64_to_cpu(sport->gid.global.subnet_prefix),
3299 be64_to_cpu(sport->gid.global.interface_id));
3302 spin_lock(&srpt_dev_lock);
3303 list_add_tail(&sdev->list, &srpt_dev_list);
3304 spin_unlock(&srpt_dev_lock);
3307 ib_set_client_data(device, &srpt_client, sdev);
3308 pr_debug("added %s.\n", device->name);
3312 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3313 sdev->srq_size, srp_max_req_size,
3316 ib_unregister_event_handler(&sdev->event_handler);
3318 ib_destroy_cm_id(sdev->cm_id);
3320 ib_destroy_srq(sdev->srq);
3322 ib_dereg_mr(sdev->mr);
3324 ib_dealloc_pd(sdev->pd);
3329 pr_info("%s(%s) failed.\n", __func__, device->name);
3334 * srpt_remove_one() - InfiniBand device removal callback function.
3336 static void srpt_remove_one(struct ib_device *device)
3338 struct srpt_device *sdev;
3341 sdev = ib_get_client_data(device, &srpt_client);
3343 pr_info("%s(%s): nothing to do.\n", __func__, device->name);
3347 srpt_unregister_mad_agent(sdev);
3349 ib_unregister_event_handler(&sdev->event_handler);
3351 /* Cancel any work queued by the just unregistered IB event handler. */
3352 for (i = 0; i < sdev->device->phys_port_cnt; i++)
3353 cancel_work_sync(&sdev->port[i].work);
3355 ib_destroy_cm_id(sdev->cm_id);
3358 * Unregistering a target must happen after destroying sdev->cm_id
3359 * such that no new SRP_LOGIN_REQ information units can arrive while
3360 * destroying the target.
3362 spin_lock(&srpt_dev_lock);
3363 list_del(&sdev->list);
3364 spin_unlock(&srpt_dev_lock);
3365 srpt_release_sdev(sdev);
3367 ib_destroy_srq(sdev->srq);
3368 ib_dereg_mr(sdev->mr);
3369 ib_dealloc_pd(sdev->pd);
3371 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3372 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
3373 sdev->ioctx_ring = NULL;
3377 static struct ib_client srpt_client = {
3379 .add = srpt_add_one,
3380 .remove = srpt_remove_one
3383 static int srpt_check_true(struct se_portal_group *se_tpg)
3388 static int srpt_check_false(struct se_portal_group *se_tpg)
3393 static char *srpt_get_fabric_name(void)
3398 static u8 srpt_get_fabric_proto_ident(struct se_portal_group *se_tpg)
3400 return SCSI_TRANSPORTID_PROTOCOLID_SRP;
3403 static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
3405 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
3407 return sport->port_guid;
3410 static u16 srpt_get_tag(struct se_portal_group *tpg)
3415 static u32 srpt_get_default_depth(struct se_portal_group *se_tpg)
3420 static u32 srpt_get_pr_transport_id(struct se_portal_group *se_tpg,
3421 struct se_node_acl *se_nacl,
3422 struct t10_pr_registration *pr_reg,
3423 int *format_code, unsigned char *buf)
3425 struct srpt_node_acl *nacl;
3426 struct spc_rdma_transport_id *tr_id;
3428 nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3429 tr_id = (void *)buf;
3430 tr_id->protocol_identifier = SCSI_TRANSPORTID_PROTOCOLID_SRP;
3431 memcpy(tr_id->i_port_id, nacl->i_port_id, sizeof(tr_id->i_port_id));
3432 return sizeof(*tr_id);
3435 static u32 srpt_get_pr_transport_id_len(struct se_portal_group *se_tpg,
3436 struct se_node_acl *se_nacl,
3437 struct t10_pr_registration *pr_reg,
3441 return sizeof(struct spc_rdma_transport_id);
3444 static char *srpt_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
3445 const char *buf, u32 *out_tid_len,
3446 char **port_nexus_ptr)
3448 struct spc_rdma_transport_id *tr_id;
3450 *port_nexus_ptr = NULL;
3451 *out_tid_len = sizeof(struct spc_rdma_transport_id);
3452 tr_id = (void *)buf;
3453 return (char *)tr_id->i_port_id;
3456 static struct se_node_acl *srpt_alloc_fabric_acl(struct se_portal_group *se_tpg)
3458 struct srpt_node_acl *nacl;
3460 nacl = kzalloc(sizeof(struct srpt_node_acl), GFP_KERNEL);
3462 pr_err("Unable to allocate struct srpt_node_acl\n");
3469 static void srpt_release_fabric_acl(struct se_portal_group *se_tpg,
3470 struct se_node_acl *se_nacl)
3472 struct srpt_node_acl *nacl;
3474 nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3478 static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
3483 static void srpt_release_cmd(struct se_cmd *se_cmd)
3485 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
3486 struct srpt_send_ioctx, cmd);
3487 struct srpt_rdma_ch *ch = ioctx->ch;
3488 unsigned long flags;
3490 WARN_ON(ioctx->state != SRPT_STATE_DONE);
3491 WARN_ON(ioctx->mapped_sg_count != 0);
3493 if (ioctx->n_rbuf > 1) {
3494 kfree(ioctx->rbufs);
3495 ioctx->rbufs = NULL;
3499 spin_lock_irqsave(&ch->spinlock, flags);
3500 list_add(&ioctx->free_list, &ch->free_list);
3501 spin_unlock_irqrestore(&ch->spinlock, flags);
3505 * srpt_close_session() - Forcibly close a session.
3507 * Callback function invoked by the TCM core to clean up sessions associated
3508 * with a node ACL when the user invokes
3509 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3511 static void srpt_close_session(struct se_session *se_sess)
3513 DECLARE_COMPLETION_ONSTACK(release_done);
3514 struct srpt_rdma_ch *ch;
3515 struct srpt_device *sdev;
3518 ch = se_sess->fabric_sess_ptr;
3519 WARN_ON(ch->sess != se_sess);
3521 pr_debug("ch %p state %d\n", ch, srpt_get_ch_state(ch));
3523 sdev = ch->sport->sdev;
3524 spin_lock_irq(&sdev->spinlock);
3525 BUG_ON(ch->release_done);
3526 ch->release_done = &release_done;
3527 __srpt_close_ch(ch);
3528 spin_unlock_irq(&sdev->spinlock);
3530 res = wait_for_completion_timeout(&release_done, 60 * HZ);
3535 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
3537 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
3538 * This object represents an arbitrary integer used to uniquely identify a
3539 * particular attached remote initiator port to a particular SCSI target port
3540 * within a particular SCSI target device within a particular SCSI instance.
3542 static u32 srpt_sess_get_index(struct se_session *se_sess)
3547 static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
3551 static u32 srpt_get_task_tag(struct se_cmd *se_cmd)
3553 struct srpt_send_ioctx *ioctx;
3555 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3559 /* Note: only used from inside debug printk's by the TCM core. */
3560 static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
3562 struct srpt_send_ioctx *ioctx;
3564 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3565 return srpt_get_cmd_state(ioctx);
3569 * srpt_parse_i_port_id() - Parse an initiator port ID.
3570 * @name: ASCII representation of a 128-bit initiator port ID.
3571 * @i_port_id: Binary 128-bit port ID.
3573 static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
3576 unsigned len, count, leading_zero_bytes;
3580 if (strncasecmp(p, "0x", 2) == 0)
3586 count = min(len / 2, 16U);
3587 leading_zero_bytes = 16 - count;
3588 memset(i_port_id, 0, leading_zero_bytes);
3589 rc = hex2bin(i_port_id + leading_zero_bytes, p, count);
3591 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc);
3598 * configfs callback function invoked for
3599 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3601 static struct se_node_acl *srpt_make_nodeacl(struct se_portal_group *tpg,
3602 struct config_group *group,
3605 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
3606 struct se_node_acl *se_nacl, *se_nacl_new;
3607 struct srpt_node_acl *nacl;
3609 u32 nexus_depth = 1;
3612 if (srpt_parse_i_port_id(i_port_id, name) < 0) {
3613 pr_err("invalid initiator port ID %s\n", name);
3618 se_nacl_new = srpt_alloc_fabric_acl(tpg);
3624 * nacl_new may be released by core_tpg_add_initiator_node_acl()
3625 * when converting a node ACL from demo mode to explict
3627 se_nacl = core_tpg_add_initiator_node_acl(tpg, se_nacl_new, name,
3629 if (IS_ERR(se_nacl)) {
3630 ret = PTR_ERR(se_nacl);
3633 /* Locate our struct srpt_node_acl and set sdev and i_port_id. */
3634 nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3635 memcpy(&nacl->i_port_id[0], &i_port_id[0], 16);
3636 nacl->sport = sport;
3638 spin_lock_irq(&sport->port_acl_lock);
3639 list_add_tail(&nacl->list, &sport->port_acl_list);
3640 spin_unlock_irq(&sport->port_acl_lock);
3644 return ERR_PTR(ret);
3648 * configfs callback function invoked for
3649 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3651 static void srpt_drop_nodeacl(struct se_node_acl *se_nacl)
3653 struct srpt_node_acl *nacl;
3654 struct srpt_device *sdev;
3655 struct srpt_port *sport;
3657 nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3658 sport = nacl->sport;
3660 spin_lock_irq(&sport->port_acl_lock);
3661 list_del(&nacl->list);
3662 spin_unlock_irq(&sport->port_acl_lock);
3663 core_tpg_del_initiator_node_acl(&sport->port_tpg_1, se_nacl, 1);
3664 srpt_release_fabric_acl(NULL, se_nacl);
3667 static ssize_t srpt_tpg_attrib_show_srp_max_rdma_size(
3668 struct se_portal_group *se_tpg,
3671 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3673 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
3676 static ssize_t srpt_tpg_attrib_store_srp_max_rdma_size(
3677 struct se_portal_group *se_tpg,
3681 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3685 ret = kstrtoul(page, 0, &val);
3687 pr_err("kstrtoul() failed with ret: %d\n", ret);
3690 if (val > MAX_SRPT_RDMA_SIZE) {
3691 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
3692 MAX_SRPT_RDMA_SIZE);
3695 if (val < DEFAULT_MAX_RDMA_SIZE) {
3696 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
3697 val, DEFAULT_MAX_RDMA_SIZE);
3700 sport->port_attrib.srp_max_rdma_size = val;
3705 TF_TPG_ATTRIB_ATTR(srpt, srp_max_rdma_size, S_IRUGO | S_IWUSR);
3707 static ssize_t srpt_tpg_attrib_show_srp_max_rsp_size(
3708 struct se_portal_group *se_tpg,
3711 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3713 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
3716 static ssize_t srpt_tpg_attrib_store_srp_max_rsp_size(
3717 struct se_portal_group *se_tpg,
3721 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3725 ret = kstrtoul(page, 0, &val);
3727 pr_err("kstrtoul() failed with ret: %d\n", ret);
3730 if (val > MAX_SRPT_RSP_SIZE) {
3731 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
3735 if (val < MIN_MAX_RSP_SIZE) {
3736 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
3740 sport->port_attrib.srp_max_rsp_size = val;
3745 TF_TPG_ATTRIB_ATTR(srpt, srp_max_rsp_size, S_IRUGO | S_IWUSR);
3747 static ssize_t srpt_tpg_attrib_show_srp_sq_size(
3748 struct se_portal_group *se_tpg,
3751 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3753 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
3756 static ssize_t srpt_tpg_attrib_store_srp_sq_size(
3757 struct se_portal_group *se_tpg,
3761 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3765 ret = kstrtoul(page, 0, &val);
3767 pr_err("kstrtoul() failed with ret: %d\n", ret);
3770 if (val > MAX_SRPT_SRQ_SIZE) {
3771 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
3775 if (val < MIN_SRPT_SRQ_SIZE) {
3776 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
3780 sport->port_attrib.srp_sq_size = val;
3785 TF_TPG_ATTRIB_ATTR(srpt, srp_sq_size, S_IRUGO | S_IWUSR);
3787 static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
3788 &srpt_tpg_attrib_srp_max_rdma_size.attr,
3789 &srpt_tpg_attrib_srp_max_rsp_size.attr,
3790 &srpt_tpg_attrib_srp_sq_size.attr,
3794 static ssize_t srpt_tpg_show_enable(
3795 struct se_portal_group *se_tpg,
3798 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3800 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
3803 static ssize_t srpt_tpg_store_enable(
3804 struct se_portal_group *se_tpg,
3808 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3812 ret = kstrtoul(page, 0, &tmp);
3814 pr_err("Unable to extract srpt_tpg_store_enable\n");
3818 if ((tmp != 0) && (tmp != 1)) {
3819 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
3823 sport->enabled = true;
3825 sport->enabled = false;
3830 TF_TPG_BASE_ATTR(srpt, enable, S_IRUGO | S_IWUSR);
3832 static struct configfs_attribute *srpt_tpg_attrs[] = {
3833 &srpt_tpg_enable.attr,
3838 * configfs callback invoked for
3839 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
3841 static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
3842 struct config_group *group,
3845 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3848 /* Initialize sport->port_wwn and sport->port_tpg_1 */
3849 res = core_tpg_register(&srpt_template, &sport->port_wwn,
3850 &sport->port_tpg_1, sport, TRANSPORT_TPG_TYPE_NORMAL);
3852 return ERR_PTR(res);
3854 return &sport->port_tpg_1;
3858 * configfs callback invoked for
3859 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
3861 static void srpt_drop_tpg(struct se_portal_group *tpg)
3863 struct srpt_port *sport = container_of(tpg,
3864 struct srpt_port, port_tpg_1);
3866 sport->enabled = false;
3867 core_tpg_deregister(&sport->port_tpg_1);
3871 * configfs callback invoked for
3872 * mkdir /sys/kernel/config/target/$driver/$port
3874 static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3875 struct config_group *group,
3878 struct srpt_port *sport;
3881 sport = srpt_lookup_port(name);
3882 pr_debug("make_tport(%s)\n", name);
3887 return &sport->port_wwn;
3890 return ERR_PTR(ret);
3894 * configfs callback invoked for
3895 * rmdir /sys/kernel/config/target/$driver/$port
3897 static void srpt_drop_tport(struct se_wwn *wwn)
3899 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3901 pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item));
3904 static ssize_t srpt_wwn_show_attr_version(struct target_fabric_configfs *tf,
3907 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3910 TF_WWN_ATTR_RO(srpt, version);
3912 static struct configfs_attribute *srpt_wwn_attrs[] = {
3913 &srpt_wwn_version.attr,
3917 static const struct target_core_fabric_ops srpt_template = {
3918 .module = THIS_MODULE,
3920 .get_fabric_name = srpt_get_fabric_name,
3921 .get_fabric_proto_ident = srpt_get_fabric_proto_ident,
3922 .tpg_get_wwn = srpt_get_fabric_wwn,
3923 .tpg_get_tag = srpt_get_tag,
3924 .tpg_get_default_depth = srpt_get_default_depth,
3925 .tpg_get_pr_transport_id = srpt_get_pr_transport_id,
3926 .tpg_get_pr_transport_id_len = srpt_get_pr_transport_id_len,
3927 .tpg_parse_pr_out_transport_id = srpt_parse_pr_out_transport_id,
3928 .tpg_check_demo_mode = srpt_check_false,
3929 .tpg_check_demo_mode_cache = srpt_check_true,
3930 .tpg_check_demo_mode_write_protect = srpt_check_true,
3931 .tpg_check_prod_mode_write_protect = srpt_check_false,
3932 .tpg_alloc_fabric_acl = srpt_alloc_fabric_acl,
3933 .tpg_release_fabric_acl = srpt_release_fabric_acl,
3934 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3935 .release_cmd = srpt_release_cmd,
3936 .check_stop_free = srpt_check_stop_free,
3937 .shutdown_session = srpt_shutdown_session,
3938 .close_session = srpt_close_session,
3939 .sess_get_index = srpt_sess_get_index,
3940 .sess_get_initiator_sid = NULL,
3941 .write_pending = srpt_write_pending,
3942 .write_pending_status = srpt_write_pending_status,
3943 .set_default_node_attributes = srpt_set_default_node_attrs,
3944 .get_task_tag = srpt_get_task_tag,
3945 .get_cmd_state = srpt_get_tcm_cmd_state,
3946 .queue_data_in = srpt_queue_data_in,
3947 .queue_status = srpt_queue_status,
3948 .queue_tm_rsp = srpt_queue_tm_rsp,
3949 .aborted_task = srpt_aborted_task,
3951 * Setup function pointers for generic logic in
3952 * target_core_fabric_configfs.c
3954 .fabric_make_wwn = srpt_make_tport,
3955 .fabric_drop_wwn = srpt_drop_tport,
3956 .fabric_make_tpg = srpt_make_tpg,
3957 .fabric_drop_tpg = srpt_drop_tpg,
3958 .fabric_post_link = NULL,
3959 .fabric_pre_unlink = NULL,
3960 .fabric_make_np = NULL,
3961 .fabric_drop_np = NULL,
3962 .fabric_make_nodeacl = srpt_make_nodeacl,
3963 .fabric_drop_nodeacl = srpt_drop_nodeacl,
3965 .tfc_wwn_attrs = srpt_wwn_attrs,
3966 .tfc_tpg_base_attrs = srpt_tpg_attrs,
3967 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
3971 * srpt_init_module() - Kernel module initialization.
3973 * Note: Since ib_register_client() registers callback functions, and since at
3974 * least one of these callback functions (srpt_add_one()) calls target core
3975 * functions, this driver must be registered with the target core before
3976 * ib_register_client() is called.
3978 static int __init srpt_init_module(void)
3983 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
3984 pr_err("invalid value %d for kernel module parameter"
3985 " srp_max_req_size -- must be at least %d.\n",
3986 srp_max_req_size, MIN_MAX_REQ_SIZE);
3990 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3991 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
3992 pr_err("invalid value %d for kernel module parameter"
3993 " srpt_srq_size -- must be in the range [%d..%d].\n",
3994 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3998 ret = target_register_template(&srpt_template);
4002 ret = ib_register_client(&srpt_client);
4004 pr_err("couldn't register IB client\n");
4005 goto out_unregister_target;
4010 out_unregister_target:
4011 target_unregister_template(&srpt_template);
4016 static void __exit srpt_cleanup_module(void)
4018 ib_unregister_client(&srpt_client);
4019 target_unregister_template(&srpt_template);
4022 module_init(srpt_init_module);
4023 module_exit(srpt_cleanup_module);