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/target_core_base.h>
47 #include <target/target_core_fabric.h>
50 /* Name of this kernel module. */
51 #define DRV_NAME "ib_srpt"
52 #define DRV_VERSION "2.0.0"
53 #define DRV_RELDATE "2011-02-14"
55 #define SRPT_ID_STRING "Linux SRP target"
58 #define pr_fmt(fmt) DRV_NAME " " fmt
60 MODULE_AUTHOR("Vu Pham and Bart Van Assche");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63 MODULE_LICENSE("Dual BSD/GPL");
69 static u64 srpt_service_guid;
70 static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */
71 static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */
73 static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
74 module_param(srp_max_req_size, int, 0444);
75 MODULE_PARM_DESC(srp_max_req_size,
76 "Maximum size of SRP request messages in bytes.");
78 static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
79 module_param(srpt_srq_size, int, 0444);
80 MODULE_PARM_DESC(srpt_srq_size,
81 "Shared receive queue (SRQ) size.");
83 static int srpt_get_u64_x(char *buffer, struct kernel_param *kp)
85 return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
87 module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
89 MODULE_PARM_DESC(srpt_service_guid,
90 "Using this value for ioc_guid, id_ext, and cm_listen_id"
91 " instead of using the node_guid of the first HCA.");
93 static struct ib_client srpt_client;
94 static void srpt_release_cmd(struct se_cmd *se_cmd);
95 static void srpt_free_ch(struct kref *kref);
96 static int srpt_queue_status(struct se_cmd *cmd);
97 static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
98 static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
99 static void srpt_process_wait_list(struct srpt_rdma_ch *ch);
102 * The only allowed channel state changes are those that change the channel
103 * state into a state with a higher numerical value. Hence the new > prev test.
105 static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new)
108 enum rdma_ch_state prev;
109 bool changed = false;
111 spin_lock_irqsave(&ch->spinlock, flags);
117 spin_unlock_irqrestore(&ch->spinlock, flags);
123 * srpt_event_handler() - Asynchronous IB event callback function.
125 * Callback function called by the InfiniBand core when an asynchronous IB
126 * event occurs. This callback may occur in interrupt context. See also
127 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
128 * Architecture Specification.
130 static void srpt_event_handler(struct ib_event_handler *handler,
131 struct ib_event *event)
133 struct srpt_device *sdev;
134 struct srpt_port *sport;
136 sdev = ib_get_client_data(event->device, &srpt_client);
137 if (!sdev || sdev->device != event->device)
140 pr_debug("ASYNC event= %d on device= %s\n", event->event,
143 switch (event->event) {
144 case IB_EVENT_PORT_ERR:
145 if (event->element.port_num <= sdev->device->phys_port_cnt) {
146 sport = &sdev->port[event->element.port_num - 1];
151 case IB_EVENT_PORT_ACTIVE:
152 case IB_EVENT_LID_CHANGE:
153 case IB_EVENT_PKEY_CHANGE:
154 case IB_EVENT_SM_CHANGE:
155 case IB_EVENT_CLIENT_REREGISTER:
156 case IB_EVENT_GID_CHANGE:
157 /* Refresh port data asynchronously. */
158 if (event->element.port_num <= sdev->device->phys_port_cnt) {
159 sport = &sdev->port[event->element.port_num - 1];
160 if (!sport->lid && !sport->sm_lid)
161 schedule_work(&sport->work);
165 pr_err("received unrecognized IB event %d\n",
172 * srpt_srq_event() - SRQ event callback function.
174 static void srpt_srq_event(struct ib_event *event, void *ctx)
176 pr_info("SRQ event %d\n", event->event);
179 static const char *get_ch_state_name(enum rdma_ch_state s)
186 case CH_DISCONNECTING:
187 return "disconnecting";
190 case CH_DISCONNECTED:
191 return "disconnected";
197 * srpt_qp_event() - QP event callback function.
199 static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
201 pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n",
202 event->event, ch->cm_id, ch->sess_name, ch->state);
204 switch (event->event) {
205 case IB_EVENT_COMM_EST:
206 ib_cm_notify(ch->cm_id, event->event);
208 case IB_EVENT_QP_LAST_WQE_REACHED:
209 pr_debug("%s-%d, state %s: received Last WQE event.\n",
210 ch->sess_name, ch->qp->qp_num,
211 get_ch_state_name(ch->state));
214 pr_err("received unrecognized IB QP event %d\n", event->event);
220 * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure.
222 * @slot: one-based slot number.
223 * @value: four-bit value.
225 * Copies the lowest four bits of value in element slot of the array of four
226 * bit elements called c_list (controller list). The index slot is one-based.
228 static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
235 tmp = c_list[id] & 0xf;
236 c_list[id] = (value << 4) | tmp;
238 tmp = c_list[id] & 0xf0;
239 c_list[id] = (value & 0xf) | tmp;
244 * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram.
246 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
249 static void srpt_get_class_port_info(struct ib_dm_mad *mad)
251 struct ib_class_port_info *cif;
253 cif = (struct ib_class_port_info *)mad->data;
254 memset(cif, 0, sizeof(*cif));
255 cif->base_version = 1;
256 cif->class_version = 1;
258 ib_set_cpi_resp_time(cif, 20);
259 mad->mad_hdr.status = 0;
263 * srpt_get_iou() - Write IOUnitInfo to a management datagram.
265 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
266 * Specification. See also section B.7, table B.6 in the SRP r16a document.
268 static void srpt_get_iou(struct ib_dm_mad *mad)
270 struct ib_dm_iou_info *ioui;
274 ioui = (struct ib_dm_iou_info *)mad->data;
275 ioui->change_id = cpu_to_be16(1);
276 ioui->max_controllers = 16;
278 /* set present for slot 1 and empty for the rest */
279 srpt_set_ioc(ioui->controller_list, 1, 1);
280 for (i = 1, slot = 2; i < 16; i++, slot++)
281 srpt_set_ioc(ioui->controller_list, slot, 0);
283 mad->mad_hdr.status = 0;
287 * srpt_get_ioc() - Write IOControllerprofile to a management datagram.
289 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
290 * Architecture Specification. See also section B.7, table B.7 in the SRP
293 static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
294 struct ib_dm_mad *mad)
296 struct srpt_device *sdev = sport->sdev;
297 struct ib_dm_ioc_profile *iocp;
299 iocp = (struct ib_dm_ioc_profile *)mad->data;
301 if (!slot || slot > 16) {
303 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
309 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
313 memset(iocp, 0, sizeof(*iocp));
314 strcpy(iocp->id_string, SRPT_ID_STRING);
315 iocp->guid = cpu_to_be64(srpt_service_guid);
316 iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
317 iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);
318 iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);
319 iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
320 iocp->subsys_device_id = 0x0;
321 iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
322 iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
323 iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
324 iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
325 iocp->send_queue_depth = cpu_to_be16(sdev->srq_size);
326 iocp->rdma_read_depth = 4;
327 iocp->send_size = cpu_to_be32(srp_max_req_size);
328 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
330 iocp->num_svc_entries = 1;
331 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
332 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
334 mad->mad_hdr.status = 0;
338 * srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
340 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
341 * Specification. See also section B.7, table B.8 in the SRP r16a document.
343 static void srpt_get_svc_entries(u64 ioc_guid,
344 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
346 struct ib_dm_svc_entries *svc_entries;
350 if (!slot || slot > 16) {
352 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
356 if (slot > 2 || lo > hi || hi > 1) {
358 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
362 svc_entries = (struct ib_dm_svc_entries *)mad->data;
363 memset(svc_entries, 0, sizeof(*svc_entries));
364 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
365 snprintf(svc_entries->service_entries[0].name,
366 sizeof(svc_entries->service_entries[0].name),
368 SRP_SERVICE_NAME_PREFIX,
371 mad->mad_hdr.status = 0;
375 * srpt_mgmt_method_get() - Process a received management datagram.
376 * @sp: source port through which the MAD has been received.
377 * @rq_mad: received MAD.
378 * @rsp_mad: response MAD.
380 static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
381 struct ib_dm_mad *rsp_mad)
387 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
389 case DM_ATTR_CLASS_PORT_INFO:
390 srpt_get_class_port_info(rsp_mad);
392 case DM_ATTR_IOU_INFO:
393 srpt_get_iou(rsp_mad);
395 case DM_ATTR_IOC_PROFILE:
396 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
397 srpt_get_ioc(sp, slot, rsp_mad);
399 case DM_ATTR_SVC_ENTRIES:
400 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
401 hi = (u8) ((slot >> 8) & 0xff);
402 lo = (u8) (slot & 0xff);
403 slot = (u16) ((slot >> 16) & 0xffff);
404 srpt_get_svc_entries(srpt_service_guid,
405 slot, hi, lo, rsp_mad);
408 rsp_mad->mad_hdr.status =
409 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
415 * srpt_mad_send_handler() - Post MAD-send callback function.
417 static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
418 struct ib_mad_send_wc *mad_wc)
420 ib_destroy_ah(mad_wc->send_buf->ah);
421 ib_free_send_mad(mad_wc->send_buf);
425 * srpt_mad_recv_handler() - MAD reception callback function.
427 static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
428 struct ib_mad_send_buf *send_buf,
429 struct ib_mad_recv_wc *mad_wc)
431 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
433 struct ib_mad_send_buf *rsp;
434 struct ib_dm_mad *dm_mad;
436 if (!mad_wc || !mad_wc->recv_buf.mad)
439 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
440 mad_wc->recv_buf.grh, mad_agent->port_num);
444 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
446 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
447 mad_wc->wc->pkey_index, 0,
448 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
450 IB_MGMT_BASE_VERSION);
457 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad));
458 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
459 dm_mad->mad_hdr.status = 0;
461 switch (mad_wc->recv_buf.mad->mad_hdr.method) {
462 case IB_MGMT_METHOD_GET:
463 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
465 case IB_MGMT_METHOD_SET:
466 dm_mad->mad_hdr.status =
467 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
470 dm_mad->mad_hdr.status =
471 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
475 if (!ib_post_send_mad(rsp, NULL)) {
476 ib_free_recv_mad(mad_wc);
477 /* will destroy_ah & free_send_mad in send completion */
481 ib_free_send_mad(rsp);
486 ib_free_recv_mad(mad_wc);
490 * srpt_refresh_port() - Configure a HCA port.
492 * Enable InfiniBand management datagram processing, update the cached sm_lid,
493 * lid and gid values, and register a callback function for processing MADs
494 * on the specified port.
496 * Note: It is safe to call this function more than once for the same port.
498 static int srpt_refresh_port(struct srpt_port *sport)
500 struct ib_mad_reg_req reg_req;
501 struct ib_port_modify port_modify;
502 struct ib_port_attr port_attr;
505 memset(&port_modify, 0, sizeof(port_modify));
506 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
507 port_modify.clr_port_cap_mask = 0;
509 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
513 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
517 sport->sm_lid = port_attr.sm_lid;
518 sport->lid = port_attr.lid;
520 ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid,
525 snprintf(sport->port_guid, sizeof(sport->port_guid),
527 be64_to_cpu(sport->gid.global.subnet_prefix),
528 be64_to_cpu(sport->gid.global.interface_id));
530 if (!sport->mad_agent) {
531 memset(®_req, 0, sizeof(reg_req));
532 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
533 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
534 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
535 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
537 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
541 srpt_mad_send_handler,
542 srpt_mad_recv_handler,
544 if (IS_ERR(sport->mad_agent)) {
545 ret = PTR_ERR(sport->mad_agent);
546 sport->mad_agent = NULL;
555 port_modify.set_port_cap_mask = 0;
556 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
557 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
565 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
567 * Note: It is safe to call this function more than once for the same device.
569 static void srpt_unregister_mad_agent(struct srpt_device *sdev)
571 struct ib_port_modify port_modify = {
572 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
574 struct srpt_port *sport;
577 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
578 sport = &sdev->port[i - 1];
579 WARN_ON(sport->port != i);
580 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
581 pr_err("disabling MAD processing failed.\n");
582 if (sport->mad_agent) {
583 ib_unregister_mad_agent(sport->mad_agent);
584 sport->mad_agent = NULL;
590 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
592 static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
593 int ioctx_size, int dma_size,
594 enum dma_data_direction dir)
596 struct srpt_ioctx *ioctx;
598 ioctx = kmalloc(ioctx_size, GFP_KERNEL);
602 ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
606 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
607 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
621 * srpt_free_ioctx() - Free an SRPT I/O context structure.
623 static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
624 int dma_size, enum dma_data_direction dir)
629 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
635 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
636 * @sdev: Device to allocate the I/O context ring for.
637 * @ring_size: Number of elements in the I/O context ring.
638 * @ioctx_size: I/O context size.
639 * @dma_size: DMA buffer size.
640 * @dir: DMA data direction.
642 static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
643 int ring_size, int ioctx_size,
644 int dma_size, enum dma_data_direction dir)
646 struct srpt_ioctx **ring;
649 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
650 && ioctx_size != sizeof(struct srpt_send_ioctx));
652 ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
655 for (i = 0; i < ring_size; ++i) {
656 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
665 srpt_free_ioctx(sdev, ring[i], dma_size, dir);
673 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
675 static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
676 struct srpt_device *sdev, int ring_size,
677 int dma_size, enum dma_data_direction dir)
681 for (i = 0; i < ring_size; ++i)
682 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
687 * srpt_get_cmd_state() - Get the state of a SCSI command.
689 static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx)
691 enum srpt_command_state state;
696 spin_lock_irqsave(&ioctx->spinlock, flags);
697 state = ioctx->state;
698 spin_unlock_irqrestore(&ioctx->spinlock, flags);
703 * srpt_set_cmd_state() - Set the state of a SCSI command.
705 * Does not modify the state of aborted commands. Returns the previous command
708 static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
709 enum srpt_command_state new)
711 enum srpt_command_state previous;
716 spin_lock_irqsave(&ioctx->spinlock, flags);
717 previous = ioctx->state;
718 if (previous != SRPT_STATE_DONE)
720 spin_unlock_irqrestore(&ioctx->spinlock, flags);
726 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
728 * Returns true if and only if the previous command state was equal to 'old'.
730 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
731 enum srpt_command_state old,
732 enum srpt_command_state new)
734 enum srpt_command_state previous;
738 WARN_ON(old == SRPT_STATE_DONE);
739 WARN_ON(new == SRPT_STATE_NEW);
741 spin_lock_irqsave(&ioctx->spinlock, flags);
742 previous = ioctx->state;
745 spin_unlock_irqrestore(&ioctx->spinlock, flags);
746 return previous == old;
750 * srpt_post_recv() - Post an IB receive request.
752 static int srpt_post_recv(struct srpt_device *sdev,
753 struct srpt_recv_ioctx *ioctx)
756 struct ib_recv_wr wr, *bad_wr;
759 list.addr = ioctx->ioctx.dma;
760 list.length = srp_max_req_size;
761 list.lkey = sdev->pd->local_dma_lkey;
763 ioctx->ioctx.cqe.done = srpt_recv_done;
764 wr.wr_cqe = &ioctx->ioctx.cqe;
769 return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
773 * srpt_zerolength_write() - Perform a zero-length RDMA write.
775 * A quote from the InfiniBand specification: C9-88: For an HCA responder
776 * using Reliable Connection service, for each zero-length RDMA READ or WRITE
777 * request, the R_Key shall not be validated, even if the request includes
780 static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
782 struct ib_send_wr wr, *bad_wr;
784 memset(&wr, 0, sizeof(wr));
785 wr.opcode = IB_WR_RDMA_WRITE;
786 wr.wr_cqe = &ch->zw_cqe;
787 wr.send_flags = IB_SEND_SIGNALED;
788 return ib_post_send(ch->qp, &wr, &bad_wr);
791 static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
793 struct srpt_rdma_ch *ch = cq->cq_context;
795 if (wc->status == IB_WC_SUCCESS) {
796 srpt_process_wait_list(ch);
798 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
799 schedule_work(&ch->release_work);
801 WARN_ONCE(1, "%s-%d\n", ch->sess_name, ch->qp->qp_num);
805 static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
806 struct srp_direct_buf *db, int nbufs, struct scatterlist **sg,
809 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
810 struct srpt_rdma_ch *ch = ioctx->ch;
811 struct scatterlist *prev = NULL;
816 ioctx->rw_ctxs = &ioctx->s_rw_ctx;
818 ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs),
824 for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) {
825 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
826 u64 remote_addr = be64_to_cpu(db->va);
827 u32 size = be32_to_cpu(db->len);
828 u32 rkey = be32_to_cpu(db->key);
830 ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false,
835 ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port,
836 ctx->sg, ctx->nents, 0, remote_addr, rkey, dir);
838 target_free_sgl(ctx->sg, ctx->nents);
842 ioctx->n_rdma += ret;
846 sg_unmark_end(&prev[prev_nents - 1]);
847 sg_chain(prev, prev_nents + 1, ctx->sg);
853 prev_nents = ctx->nents;
855 *sg_cnt += ctx->nents;
862 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
864 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
865 ctx->sg, ctx->nents, dir);
866 target_free_sgl(ctx->sg, ctx->nents);
868 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
869 kfree(ioctx->rw_ctxs);
873 static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch,
874 struct srpt_send_ioctx *ioctx)
876 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
879 for (i = 0; i < ioctx->n_rw_ctx; i++) {
880 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
882 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
883 ctx->sg, ctx->nents, dir);
884 target_free_sgl(ctx->sg, ctx->nents);
887 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
888 kfree(ioctx->rw_ctxs);
891 static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
894 * The pointer computations below will only be compiled correctly
895 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
896 * whether srp_cmd::add_data has been declared as a byte pointer.
898 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&
899 !__same_type(srp_cmd->add_data[0], (u8)0));
902 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
903 * CDB LENGTH' field are reserved and the size in bytes of this field
904 * is four times the value specified in bits 3..7. Hence the "& ~3".
906 return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3);
910 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
911 * @ioctx: Pointer to the I/O context associated with the request.
912 * @srp_cmd: Pointer to the SRP_CMD request data.
913 * @dir: Pointer to the variable to which the transfer direction will be
915 * @data_len: Pointer to the variable to which the total data length of all
916 * descriptors in the SRP_CMD request will be written.
918 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
920 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
921 * -ENOMEM when memory allocation fails and zero upon success.
923 static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
924 struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
925 struct scatterlist **sg, unsigned *sg_cnt, u64 *data_len)
931 * The lower four bits of the buffer format field contain the DATA-IN
932 * buffer descriptor format, and the highest four bits contain the
933 * DATA-OUT buffer descriptor format.
935 if (srp_cmd->buf_fmt & 0xf)
936 /* DATA-IN: transfer data from target to initiator (read). */
937 *dir = DMA_FROM_DEVICE;
938 else if (srp_cmd->buf_fmt >> 4)
939 /* DATA-OUT: transfer data from initiator to target (write). */
940 *dir = DMA_TO_DEVICE;
944 /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
945 ioctx->cmd.data_direction = *dir;
947 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
948 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
949 struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd);
951 *data_len = be32_to_cpu(db->len);
952 return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt);
953 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
954 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
955 struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd);
956 int nbufs = be32_to_cpu(idb->table_desc.len) /
957 sizeof(struct srp_direct_buf);
960 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
961 pr_err("received unsupported SRP_CMD request"
962 " type (%u out + %u in != %u / %zu)\n",
963 srp_cmd->data_out_desc_cnt,
964 srp_cmd->data_in_desc_cnt,
965 be32_to_cpu(idb->table_desc.len),
966 sizeof(struct srp_direct_buf));
970 *data_len = be32_to_cpu(idb->len);
971 return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs,
980 * srpt_init_ch_qp() - Initialize queue pair attributes.
982 * Initialized the attributes of queue pair 'qp' by allowing local write,
983 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
985 static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
987 struct ib_qp_attr *attr;
990 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
994 attr->qp_state = IB_QPS_INIT;
995 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
996 IB_ACCESS_REMOTE_WRITE;
997 attr->port_num = ch->sport->port;
998 attr->pkey_index = 0;
1000 ret = ib_modify_qp(qp, attr,
1001 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
1009 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
1010 * @ch: channel of the queue pair.
1011 * @qp: queue pair to change the state of.
1013 * Returns zero upon success and a negative value upon failure.
1015 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1016 * If this structure ever becomes larger, it might be necessary to allocate
1017 * it dynamically instead of on the stack.
1019 static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1021 struct ib_qp_attr qp_attr;
1025 qp_attr.qp_state = IB_QPS_RTR;
1026 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1030 qp_attr.max_dest_rd_atomic = 4;
1032 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1039 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1040 * @ch: channel of the queue pair.
1041 * @qp: queue pair to change the state of.
1043 * Returns zero upon success and a negative value upon failure.
1045 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1046 * If this structure ever becomes larger, it might be necessary to allocate
1047 * it dynamically instead of on the stack.
1049 static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1051 struct ib_qp_attr qp_attr;
1055 qp_attr.qp_state = IB_QPS_RTS;
1056 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1060 qp_attr.max_rd_atomic = 4;
1062 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1069 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1071 static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1073 struct ib_qp_attr qp_attr;
1075 qp_attr.qp_state = IB_QPS_ERR;
1076 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1080 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1082 static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1084 struct srpt_send_ioctx *ioctx;
1085 unsigned long flags;
1090 spin_lock_irqsave(&ch->spinlock, flags);
1091 if (!list_empty(&ch->free_list)) {
1092 ioctx = list_first_entry(&ch->free_list,
1093 struct srpt_send_ioctx, free_list);
1094 list_del(&ioctx->free_list);
1096 spin_unlock_irqrestore(&ch->spinlock, flags);
1101 BUG_ON(ioctx->ch != ch);
1102 spin_lock_init(&ioctx->spinlock);
1103 ioctx->state = SRPT_STATE_NEW;
1105 ioctx->n_rw_ctx = 0;
1106 init_completion(&ioctx->tx_done);
1107 ioctx->queue_status_only = false;
1109 * transport_init_se_cmd() does not initialize all fields, so do it
1112 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1113 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1119 * srpt_abort_cmd() - Abort a SCSI command.
1120 * @ioctx: I/O context associated with the SCSI command.
1121 * @context: Preferred execution context.
1123 static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1125 enum srpt_command_state state;
1126 unsigned long flags;
1131 * If the command is in a state where the target core is waiting for
1132 * the ib_srpt driver, change the state to the next state.
1135 spin_lock_irqsave(&ioctx->spinlock, flags);
1136 state = ioctx->state;
1138 case SRPT_STATE_NEED_DATA:
1139 ioctx->state = SRPT_STATE_DATA_IN;
1141 case SRPT_STATE_CMD_RSP_SENT:
1142 case SRPT_STATE_MGMT_RSP_SENT:
1143 ioctx->state = SRPT_STATE_DONE;
1146 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1150 spin_unlock_irqrestore(&ioctx->spinlock, flags);
1152 pr_debug("Aborting cmd with state %d and tag %lld\n", state,
1156 case SRPT_STATE_NEW:
1157 case SRPT_STATE_DATA_IN:
1158 case SRPT_STATE_MGMT:
1159 case SRPT_STATE_DONE:
1161 * Do nothing - defer abort processing until
1162 * srpt_queue_response() is invoked.
1165 case SRPT_STATE_NEED_DATA:
1166 pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);
1167 transport_generic_request_failure(&ioctx->cmd,
1168 TCM_CHECK_CONDITION_ABORT_CMD);
1170 case SRPT_STATE_CMD_RSP_SENT:
1172 * SRP_RSP sending failed or the SRP_RSP send completion has
1173 * not been received in time.
1175 transport_generic_free_cmd(&ioctx->cmd, 0);
1177 case SRPT_STATE_MGMT_RSP_SENT:
1178 transport_generic_free_cmd(&ioctx->cmd, 0);
1181 WARN(1, "Unexpected command state (%d)", state);
1189 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1190 * the data that has been transferred via IB RDMA had to be postponed until the
1191 * check_stop_free() callback. None of this is necessary anymore and needs to
1194 static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1196 struct srpt_rdma_ch *ch = cq->cq_context;
1197 struct srpt_send_ioctx *ioctx =
1198 container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
1200 WARN_ON(ioctx->n_rdma <= 0);
1201 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1204 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1205 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1207 srpt_abort_cmd(ioctx);
1211 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1212 SRPT_STATE_DATA_IN))
1213 target_execute_cmd(&ioctx->cmd);
1215 pr_err("%s[%d]: wrong state = %d\n", __func__,
1216 __LINE__, srpt_get_cmd_state(ioctx));
1220 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1221 * @ch: RDMA channel through which the request has been received.
1222 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1223 * be built in the buffer ioctx->buf points at and hence this function will
1224 * overwrite the request data.
1225 * @tag: tag of the request for which this response is being generated.
1226 * @status: value for the STATUS field of the SRP_RSP information unit.
1228 * Returns the size in bytes of the SRP_RSP response.
1230 * An SRP_RSP response contains a SCSI status or service response. See also
1231 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1232 * response. See also SPC-2 for more information about sense data.
1234 static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1235 struct srpt_send_ioctx *ioctx, u64 tag,
1238 struct srp_rsp *srp_rsp;
1239 const u8 *sense_data;
1240 int sense_data_len, max_sense_len;
1243 * The lowest bit of all SAM-3 status codes is zero (see also
1244 * paragraph 5.3 in SAM-3).
1246 WARN_ON(status & 1);
1248 srp_rsp = ioctx->ioctx.buf;
1251 sense_data = ioctx->sense_data;
1252 sense_data_len = ioctx->cmd.scsi_sense_length;
1253 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1255 memset(srp_rsp, 0, sizeof(*srp_rsp));
1256 srp_rsp->opcode = SRP_RSP;
1257 srp_rsp->req_lim_delta =
1258 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1260 srp_rsp->status = status;
1262 if (sense_data_len) {
1263 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1264 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1265 if (sense_data_len > max_sense_len) {
1266 pr_warn("truncated sense data from %d to %d"
1267 " bytes\n", sense_data_len, max_sense_len);
1268 sense_data_len = max_sense_len;
1271 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1272 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1273 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1276 return sizeof(*srp_rsp) + sense_data_len;
1280 * srpt_build_tskmgmt_rsp() - Build a task management response.
1281 * @ch: RDMA channel through which the request has been received.
1282 * @ioctx: I/O context in which the SRP_RSP response will be built.
1283 * @rsp_code: RSP_CODE that will be stored in the response.
1284 * @tag: Tag of the request for which this response is being generated.
1286 * Returns the size in bytes of the SRP_RSP response.
1288 * An SRP_RSP response contains a SCSI status or service response. See also
1289 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1292 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1293 struct srpt_send_ioctx *ioctx,
1294 u8 rsp_code, u64 tag)
1296 struct srp_rsp *srp_rsp;
1301 resp_len = sizeof(*srp_rsp) + resp_data_len;
1303 srp_rsp = ioctx->ioctx.buf;
1305 memset(srp_rsp, 0, sizeof(*srp_rsp));
1307 srp_rsp->opcode = SRP_RSP;
1308 srp_rsp->req_lim_delta =
1309 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1312 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1313 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1314 srp_rsp->data[3] = rsp_code;
1319 static int srpt_check_stop_free(struct se_cmd *cmd)
1321 struct srpt_send_ioctx *ioctx = container_of(cmd,
1322 struct srpt_send_ioctx, cmd);
1324 return target_put_sess_cmd(&ioctx->cmd);
1328 * srpt_handle_cmd() - Process SRP_CMD.
1330 static void srpt_handle_cmd(struct srpt_rdma_ch *ch,
1331 struct srpt_recv_ioctx *recv_ioctx,
1332 struct srpt_send_ioctx *send_ioctx)
1335 struct srp_cmd *srp_cmd;
1336 struct scatterlist *sg = NULL;
1337 unsigned sg_cnt = 0;
1339 enum dma_data_direction dir;
1342 BUG_ON(!send_ioctx);
1344 srp_cmd = recv_ioctx->ioctx.buf;
1345 cmd = &send_ioctx->cmd;
1346 cmd->tag = srp_cmd->tag;
1348 switch (srp_cmd->task_attr) {
1349 case SRP_CMD_SIMPLE_Q:
1350 cmd->sam_task_attr = TCM_SIMPLE_TAG;
1352 case SRP_CMD_ORDERED_Q:
1354 cmd->sam_task_attr = TCM_ORDERED_TAG;
1356 case SRP_CMD_HEAD_OF_Q:
1357 cmd->sam_task_attr = TCM_HEAD_TAG;
1360 cmd->sam_task_attr = TCM_ACA_TAG;
1364 rc = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &sg, &sg_cnt,
1367 if (rc != -EAGAIN) {
1368 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1374 rc = target_submit_cmd_map_sgls(cmd, ch->sess, srp_cmd->cdb,
1375 &send_ioctx->sense_data[0],
1376 scsilun_to_int(&srp_cmd->lun), data_len,
1377 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF,
1378 sg, sg_cnt, NULL, 0, NULL, 0);
1380 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,
1387 send_ioctx->state = SRPT_STATE_DONE;
1388 srpt_release_cmd(cmd);
1391 static int srp_tmr_to_tcm(int fn)
1394 case SRP_TSK_ABORT_TASK:
1395 return TMR_ABORT_TASK;
1396 case SRP_TSK_ABORT_TASK_SET:
1397 return TMR_ABORT_TASK_SET;
1398 case SRP_TSK_CLEAR_TASK_SET:
1399 return TMR_CLEAR_TASK_SET;
1400 case SRP_TSK_LUN_RESET:
1401 return TMR_LUN_RESET;
1402 case SRP_TSK_CLEAR_ACA:
1403 return TMR_CLEAR_ACA;
1410 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1412 * Returns 0 if and only if the request will be processed by the target core.
1414 * For more information about SRP_TSK_MGMT information units, see also section
1415 * 6.7 in the SRP r16a document.
1417 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1418 struct srpt_recv_ioctx *recv_ioctx,
1419 struct srpt_send_ioctx *send_ioctx)
1421 struct srp_tsk_mgmt *srp_tsk;
1423 struct se_session *sess = ch->sess;
1427 BUG_ON(!send_ioctx);
1429 srp_tsk = recv_ioctx->ioctx.buf;
1430 cmd = &send_ioctx->cmd;
1432 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1433 " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func,
1434 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
1436 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
1437 send_ioctx->cmd.tag = srp_tsk->tag;
1438 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
1439 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,
1440 scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,
1441 GFP_KERNEL, srp_tsk->task_tag,
1442 TARGET_SCF_ACK_KREF);
1444 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
1449 transport_send_check_condition_and_sense(cmd, 0, 0); // XXX:
1453 * srpt_handle_new_iu() - Process a newly received information unit.
1454 * @ch: RDMA channel through which the information unit has been received.
1455 * @ioctx: SRPT I/O context associated with the information unit.
1457 static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
1458 struct srpt_recv_ioctx *recv_ioctx,
1459 struct srpt_send_ioctx *send_ioctx)
1461 struct srp_cmd *srp_cmd;
1464 BUG_ON(!recv_ioctx);
1466 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1467 recv_ioctx->ioctx.dma, srp_max_req_size,
1470 if (unlikely(ch->state == CH_CONNECTING))
1473 if (unlikely(ch->state != CH_LIVE))
1476 srp_cmd = recv_ioctx->ioctx.buf;
1477 if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
1479 if (!list_empty(&ch->cmd_wait_list))
1481 send_ioctx = srpt_get_send_ioctx(ch);
1483 if (unlikely(!send_ioctx))
1487 switch (srp_cmd->opcode) {
1489 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1492 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1495 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1498 pr_debug("received SRP_CRED_RSP\n");
1501 pr_debug("received SRP_AER_RSP\n");
1504 pr_err("Received SRP_RSP\n");
1507 pr_err("received IU with unknown opcode 0x%x\n",
1512 srpt_post_recv(ch->sport->sdev, recv_ioctx);
1516 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1519 static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1521 struct srpt_rdma_ch *ch = cq->cq_context;
1522 struct srpt_recv_ioctx *ioctx =
1523 container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
1525 if (wc->status == IB_WC_SUCCESS) {
1528 req_lim = atomic_dec_return(&ch->req_lim);
1529 if (unlikely(req_lim < 0))
1530 pr_err("req_lim = %d < 0\n", req_lim);
1531 srpt_handle_new_iu(ch, ioctx, NULL);
1533 pr_info("receiving failed for ioctx %p with status %d\n",
1539 * This function must be called from the context in which RDMA completions are
1540 * processed because it accesses the wait list without protection against
1541 * access from other threads.
1543 static void srpt_process_wait_list(struct srpt_rdma_ch *ch)
1545 struct srpt_send_ioctx *ioctx;
1547 while (!list_empty(&ch->cmd_wait_list) &&
1548 ch->state >= CH_LIVE &&
1549 (ioctx = srpt_get_send_ioctx(ch)) != NULL) {
1550 struct srpt_recv_ioctx *recv_ioctx;
1552 recv_ioctx = list_first_entry(&ch->cmd_wait_list,
1553 struct srpt_recv_ioctx,
1555 list_del(&recv_ioctx->wait_list);
1556 srpt_handle_new_iu(ch, recv_ioctx, ioctx);
1561 * Note: Although this has not yet been observed during tests, at least in
1562 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1563 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1564 * value in each response is set to one, and it is possible that this response
1565 * makes the initiator send a new request before the send completion for that
1566 * response has been processed. This could e.g. happen if the call to
1567 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1568 * if IB retransmission causes generation of the send completion to be
1569 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1570 * are queued on cmd_wait_list. The code below processes these delayed
1571 * requests one at a time.
1573 static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
1575 struct srpt_rdma_ch *ch = cq->cq_context;
1576 struct srpt_send_ioctx *ioctx =
1577 container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
1578 enum srpt_command_state state;
1580 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1582 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
1583 state != SRPT_STATE_MGMT_RSP_SENT);
1585 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
1587 if (wc->status != IB_WC_SUCCESS)
1588 pr_info("sending response for ioctx 0x%p failed"
1589 " with status %d\n", ioctx, wc->status);
1591 if (state != SRPT_STATE_DONE) {
1592 transport_generic_free_cmd(&ioctx->cmd, 0);
1594 pr_err("IB completion has been received too late for"
1595 " wr_id = %u.\n", ioctx->ioctx.index);
1598 srpt_process_wait_list(ch);
1602 * srpt_create_ch_ib() - Create receive and send completion queues.
1604 static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
1606 struct ib_qp_init_attr *qp_init;
1607 struct srpt_port *sport = ch->sport;
1608 struct srpt_device *sdev = sport->sdev;
1609 const struct ib_device_attr *attrs = &sdev->device->attrs;
1610 u32 srp_sq_size = sport->port_attrib.srp_sq_size;
1613 WARN_ON(ch->rq_size < 1);
1616 qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);
1621 ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + srp_sq_size,
1622 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE);
1623 if (IS_ERR(ch->cq)) {
1624 ret = PTR_ERR(ch->cq);
1625 pr_err("failed to create CQ cqe= %d ret= %d\n",
1626 ch->rq_size + srp_sq_size, ret);
1630 qp_init->qp_context = (void *)ch;
1631 qp_init->event_handler
1632 = (void(*)(struct ib_event *, void*))srpt_qp_event;
1633 qp_init->send_cq = ch->cq;
1634 qp_init->recv_cq = ch->cq;
1635 qp_init->srq = sdev->srq;
1636 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
1637 qp_init->qp_type = IB_QPT_RC;
1639 * We divide up our send queue size into half SEND WRs to send the
1640 * completions, and half R/W contexts to actually do the RDMA
1641 * READ/WRITE transfers. Note that we need to allocate CQ slots for
1642 * both both, as RDMA contexts will also post completions for the
1645 qp_init->cap.max_send_wr = srp_sq_size / 2;
1646 qp_init->cap.max_rdma_ctxs = srp_sq_size / 2;
1647 qp_init->cap.max_send_sge = min(attrs->max_sge, SRPT_MAX_SG_PER_WQE);
1648 qp_init->port_num = ch->sport->port;
1650 ch->qp = ib_create_qp(sdev->pd, qp_init);
1651 if (IS_ERR(ch->qp)) {
1652 ret = PTR_ERR(ch->qp);
1653 if (ret == -ENOMEM) {
1655 if (srp_sq_size >= MIN_SRPT_SQ_SIZE) {
1656 ib_destroy_cq(ch->cq);
1660 pr_err("failed to create_qp ret= %d\n", ret);
1661 goto err_destroy_cq;
1664 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
1666 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1667 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
1668 qp_init->cap.max_send_wr, ch->cm_id);
1670 ret = srpt_init_ch_qp(ch, ch->qp);
1672 goto err_destroy_qp;
1679 ib_destroy_qp(ch->qp);
1685 static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
1687 ib_destroy_qp(ch->qp);
1692 * srpt_close_ch() - Close an RDMA channel.
1694 * Make sure all resources associated with the channel will be deallocated at
1695 * an appropriate time.
1697 * Returns true if and only if the channel state has been modified into
1700 static bool srpt_close_ch(struct srpt_rdma_ch *ch)
1704 if (!srpt_set_ch_state(ch, CH_DRAINING)) {
1705 pr_debug("%s-%d: already closed\n", ch->sess_name,
1710 kref_get(&ch->kref);
1712 ret = srpt_ch_qp_err(ch);
1714 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1715 ch->sess_name, ch->qp->qp_num, ret);
1717 pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
1719 ret = srpt_zerolength_write(ch);
1721 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1722 ch->sess_name, ch->qp->qp_num, ret);
1723 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
1724 schedule_work(&ch->release_work);
1729 kref_put(&ch->kref, srpt_free_ch);
1735 * Change the channel state into CH_DISCONNECTING. If a channel has not yet
1736 * reached the connected state, close it. If a channel is in the connected
1737 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
1738 * the responsibility of the caller to ensure that this function is not
1739 * invoked concurrently with the code that accepts a connection. This means
1740 * that this function must either be invoked from inside a CM callback
1741 * function or that it must be invoked with the srpt_port.mutex held.
1743 static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
1747 if (!srpt_set_ch_state(ch, CH_DISCONNECTING))
1750 ret = ib_send_cm_dreq(ch->cm_id, NULL, 0);
1752 ret = ib_send_cm_drep(ch->cm_id, NULL, 0);
1754 if (ret < 0 && srpt_close_ch(ch))
1760 static void __srpt_close_all_ch(struct srpt_device *sdev)
1762 struct srpt_rdma_ch *ch;
1764 lockdep_assert_held(&sdev->mutex);
1766 list_for_each_entry(ch, &sdev->rch_list, list) {
1767 if (srpt_disconnect_ch(ch) >= 0)
1768 pr_info("Closing channel %s-%d because target %s has been disabled\n",
1769 ch->sess_name, ch->qp->qp_num,
1770 sdev->device->name);
1775 static void srpt_free_ch(struct kref *kref)
1777 struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);
1782 static void srpt_release_channel_work(struct work_struct *w)
1784 struct srpt_rdma_ch *ch;
1785 struct srpt_device *sdev;
1786 struct se_session *se_sess;
1788 ch = container_of(w, struct srpt_rdma_ch, release_work);
1789 pr_debug("%s: %s-%d; release_done = %p\n", __func__, ch->sess_name,
1790 ch->qp->qp_num, ch->release_done);
1792 sdev = ch->sport->sdev;
1798 target_sess_cmd_list_set_waiting(se_sess);
1799 target_wait_for_sess_cmds(se_sess);
1801 transport_deregister_session_configfs(se_sess);
1802 transport_deregister_session(se_sess);
1805 ib_destroy_cm_id(ch->cm_id);
1807 srpt_destroy_ch_ib(ch);
1809 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
1810 ch->sport->sdev, ch->rq_size,
1811 ch->rsp_size, DMA_TO_DEVICE);
1813 mutex_lock(&sdev->mutex);
1814 list_del_init(&ch->list);
1815 if (ch->release_done)
1816 complete(ch->release_done);
1817 mutex_unlock(&sdev->mutex);
1819 wake_up(&sdev->ch_releaseQ);
1821 kref_put(&ch->kref, srpt_free_ch);
1825 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
1827 * Ownership of the cm_id is transferred to the target session if this
1828 * functions returns zero. Otherwise the caller remains the owner of cm_id.
1830 static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
1831 struct ib_cm_req_event_param *param,
1834 struct srpt_device *sdev = cm_id->context;
1835 struct srpt_port *sport = &sdev->port[param->port - 1];
1836 struct srp_login_req *req;
1837 struct srp_login_rsp *rsp;
1838 struct srp_login_rej *rej;
1839 struct ib_cm_rep_param *rep_param;
1840 struct srpt_rdma_ch *ch, *tmp_ch;
1845 WARN_ON_ONCE(irqs_disabled());
1847 if (WARN_ON(!sdev || !private_data))
1850 req = (struct srp_login_req *)private_data;
1852 it_iu_len = be32_to_cpu(req->req_it_iu_len);
1854 pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
1855 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
1856 " (guid=0x%llx:0x%llx)\n",
1857 be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
1858 be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
1859 be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
1860 be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
1863 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
1864 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
1866 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
1867 rej = kzalloc(sizeof(*rej), GFP_KERNEL);
1868 rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);
1870 if (!rsp || !rej || !rep_param) {
1875 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
1876 rej->reason = cpu_to_be32(
1877 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
1879 pr_err("rejected SRP_LOGIN_REQ because its"
1880 " length (%d bytes) is out of range (%d .. %d)\n",
1881 it_iu_len, 64, srp_max_req_size);
1885 if (!sport->enabled) {
1886 rej->reason = cpu_to_be32(
1887 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
1889 pr_err("rejected SRP_LOGIN_REQ because the target port"
1890 " has not yet been enabled\n");
1894 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
1895 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
1897 mutex_lock(&sdev->mutex);
1899 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
1900 if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
1901 && !memcmp(ch->t_port_id, req->target_port_id, 16)
1902 && param->port == ch->sport->port
1903 && param->listen_id == ch->sport->sdev->cm_id
1905 if (srpt_disconnect_ch(ch) < 0)
1907 pr_info("Relogin - closed existing channel %s\n",
1910 SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
1914 mutex_unlock(&sdev->mutex);
1917 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
1919 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
1920 || *(__be64 *)(req->target_port_id + 8) !=
1921 cpu_to_be64(srpt_service_guid)) {
1922 rej->reason = cpu_to_be32(
1923 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
1925 pr_err("rejected SRP_LOGIN_REQ because it"
1926 " has an invalid target port identifier.\n");
1930 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
1932 rej->reason = cpu_to_be32(
1933 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
1934 pr_err("rejected SRP_LOGIN_REQ because no memory.\n");
1939 kref_init(&ch->kref);
1940 ch->zw_cqe.done = srpt_zerolength_write_done;
1941 INIT_WORK(&ch->release_work, srpt_release_channel_work);
1942 memcpy(ch->i_port_id, req->initiator_port_id, 16);
1943 memcpy(ch->t_port_id, req->target_port_id, 16);
1944 ch->sport = &sdev->port[param->port - 1];
1946 cm_id->context = ch;
1948 * Avoid QUEUE_FULL conditions by limiting the number of buffers used
1949 * for the SRP protocol to the command queue size.
1951 ch->rq_size = SRPT_RQ_SIZE;
1952 spin_lock_init(&ch->spinlock);
1953 ch->state = CH_CONNECTING;
1954 INIT_LIST_HEAD(&ch->cmd_wait_list);
1955 ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
1957 ch->ioctx_ring = (struct srpt_send_ioctx **)
1958 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
1959 sizeof(*ch->ioctx_ring[0]),
1960 ch->rsp_size, DMA_TO_DEVICE);
1961 if (!ch->ioctx_ring)
1964 INIT_LIST_HEAD(&ch->free_list);
1965 for (i = 0; i < ch->rq_size; i++) {
1966 ch->ioctx_ring[i]->ch = ch;
1967 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
1970 ret = srpt_create_ch_ib(ch);
1972 rej->reason = cpu_to_be32(
1973 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
1974 pr_err("rejected SRP_LOGIN_REQ because creating"
1975 " a new RDMA channel failed.\n");
1979 ret = srpt_ch_qp_rtr(ch, ch->qp);
1981 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
1982 pr_err("rejected SRP_LOGIN_REQ because enabling"
1983 " RTR failed (error code = %d)\n", ret);
1988 * Use the initator port identifier as the session name, when
1989 * checking against se_node_acl->initiatorname[] this can be
1990 * with or without preceeding '0x'.
1992 snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx",
1993 be64_to_cpu(*(__be64 *)ch->i_port_id),
1994 be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
1996 pr_debug("registering session %s\n", ch->sess_name);
1997 p = &ch->sess_name[0];
2000 ch->sess = target_alloc_session(&sport->port_tpg_1, 0, 0,
2001 TARGET_PROT_NORMAL, p, ch, NULL);
2002 if (IS_ERR(ch->sess)) {
2003 pr_info("Rejected login because no ACL has been"
2004 " configured yet for initiator %s.\n", p);
2006 * XXX: Hack to retry of ch->i_port_id without leading '0x'
2008 if (p == &ch->sess_name[0]) {
2012 rej->reason = cpu_to_be32((PTR_ERR(ch->sess) == -ENOMEM) ?
2013 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES :
2014 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2018 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess,
2019 ch->sess_name, ch->cm_id);
2021 /* create srp_login_response */
2022 rsp->opcode = SRP_LOGIN_RSP;
2023 rsp->tag = req->tag;
2024 rsp->max_it_iu_len = req->req_it_iu_len;
2025 rsp->max_ti_iu_len = req->req_it_iu_len;
2026 ch->max_ti_iu_len = it_iu_len;
2027 rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2028 | SRP_BUF_FORMAT_INDIRECT);
2029 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2030 atomic_set(&ch->req_lim, ch->rq_size);
2031 atomic_set(&ch->req_lim_delta, 0);
2033 /* create cm reply */
2034 rep_param->qp_num = ch->qp->qp_num;
2035 rep_param->private_data = (void *)rsp;
2036 rep_param->private_data_len = sizeof(*rsp);
2037 rep_param->rnr_retry_count = 7;
2038 rep_param->flow_control = 1;
2039 rep_param->failover_accepted = 0;
2041 rep_param->responder_resources = 4;
2042 rep_param->initiator_depth = 4;
2044 ret = ib_send_cm_rep(cm_id, rep_param);
2046 pr_err("sending SRP_LOGIN_REQ response failed"
2047 " (error code = %d)\n", ret);
2048 goto release_channel;
2051 mutex_lock(&sdev->mutex);
2052 list_add_tail(&ch->list, &sdev->rch_list);
2053 mutex_unlock(&sdev->mutex);
2058 srpt_disconnect_ch(ch);
2059 transport_deregister_session_configfs(ch->sess);
2060 transport_deregister_session(ch->sess);
2064 srpt_destroy_ch_ib(ch);
2067 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2068 ch->sport->sdev, ch->rq_size,
2069 ch->rsp_size, DMA_TO_DEVICE);
2074 rej->opcode = SRP_LOGIN_REJ;
2075 rej->tag = req->tag;
2076 rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2077 | SRP_BUF_FORMAT_INDIRECT);
2079 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2080 (void *)rej, sizeof(*rej));
2090 static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,
2091 enum ib_cm_rej_reason reason,
2092 const u8 *private_data,
2093 u8 private_data_len)
2098 if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,
2100 for (i = 0; i < private_data_len; i++)
2101 sprintf(priv + 3 * i, " %02x", private_data[i]);
2103 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2104 ch->sess_name, ch->qp->qp_num, reason, private_data_len ?
2105 "; private data" : "", priv ? priv : " (?)");
2110 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2112 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2113 * and that the recipient may begin transmitting (RTU = ready to use).
2115 static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
2119 if (srpt_set_ch_state(ch, CH_LIVE)) {
2120 ret = srpt_ch_qp_rts(ch, ch->qp);
2123 /* Trigger wait list processing. */
2124 ret = srpt_zerolength_write(ch);
2125 WARN_ONCE(ret < 0, "%d\n", ret);
2133 * srpt_cm_handler() - IB connection manager callback function.
2135 * A non-zero return value will cause the caller destroy the CM ID.
2137 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2138 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2139 * a non-zero value in any other case will trigger a race with the
2140 * ib_destroy_cm_id() call in srpt_release_channel().
2142 static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2144 struct srpt_rdma_ch *ch = cm_id->context;
2148 switch (event->event) {
2149 case IB_CM_REQ_RECEIVED:
2150 ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
2151 event->private_data);
2153 case IB_CM_REJ_RECEIVED:
2154 srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,
2155 event->private_data,
2156 IB_CM_REJ_PRIVATE_DATA_SIZE);
2158 case IB_CM_RTU_RECEIVED:
2159 case IB_CM_USER_ESTABLISHED:
2160 srpt_cm_rtu_recv(ch);
2162 case IB_CM_DREQ_RECEIVED:
2163 srpt_disconnect_ch(ch);
2165 case IB_CM_DREP_RECEIVED:
2166 pr_info("Received CM DREP message for ch %s-%d.\n",
2167 ch->sess_name, ch->qp->qp_num);
2170 case IB_CM_TIMEWAIT_EXIT:
2171 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2172 ch->sess_name, ch->qp->qp_num);
2175 case IB_CM_REP_ERROR:
2176 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
2179 case IB_CM_DREQ_ERROR:
2180 pr_info("Received CM DREQ ERROR event.\n");
2182 case IB_CM_MRA_RECEIVED:
2183 pr_info("Received CM MRA event\n");
2186 pr_err("received unrecognized CM event %d\n", event->event);
2193 static int srpt_write_pending_status(struct se_cmd *se_cmd)
2195 struct srpt_send_ioctx *ioctx;
2197 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2198 return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA;
2202 * srpt_write_pending() - Start data transfer from initiator to target (write).
2204 static int srpt_write_pending(struct se_cmd *se_cmd)
2206 struct srpt_send_ioctx *ioctx =
2207 container_of(se_cmd, struct srpt_send_ioctx, cmd);
2208 struct srpt_rdma_ch *ch = ioctx->ch;
2209 struct ib_send_wr *first_wr = NULL, *bad_wr;
2210 struct ib_cqe *cqe = &ioctx->rdma_cqe;
2211 enum srpt_command_state new_state;
2214 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2215 WARN_ON(new_state == SRPT_STATE_DONE);
2217 if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) {
2218 pr_warn("%s: IB send queue full (needed %d)\n",
2219 __func__, ioctx->n_rdma);
2224 cqe->done = srpt_rdma_read_done;
2225 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2226 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2228 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port,
2233 ret = ib_post_send(ch->qp, first_wr, &bad_wr);
2235 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
2236 __func__, ret, ioctx->n_rdma,
2237 atomic_read(&ch->sq_wr_avail));
2243 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
2247 static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2249 switch (tcm_mgmt_status) {
2250 case TMR_FUNCTION_COMPLETE:
2251 return SRP_TSK_MGMT_SUCCESS;
2252 case TMR_FUNCTION_REJECTED:
2253 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
2255 return SRP_TSK_MGMT_FAILED;
2259 * srpt_queue_response() - Transmits the response to a SCSI command.
2261 * Callback function called by the TCM core. Must not block since it can be
2262 * invoked on the context of the IB completion handler.
2264 static void srpt_queue_response(struct se_cmd *cmd)
2266 struct srpt_send_ioctx *ioctx =
2267 container_of(cmd, struct srpt_send_ioctx, cmd);
2268 struct srpt_rdma_ch *ch = ioctx->ch;
2269 struct srpt_device *sdev = ch->sport->sdev;
2270 struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr;
2272 enum srpt_command_state state;
2273 unsigned long flags;
2274 int resp_len, ret, i;
2279 spin_lock_irqsave(&ioctx->spinlock, flags);
2280 state = ioctx->state;
2282 case SRPT_STATE_NEW:
2283 case SRPT_STATE_DATA_IN:
2284 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
2286 case SRPT_STATE_MGMT:
2287 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
2290 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2291 ch, ioctx->ioctx.index, ioctx->state);
2294 spin_unlock_irqrestore(&ioctx->spinlock, flags);
2296 if (unlikely(transport_check_aborted_status(&ioctx->cmd, false)
2297 || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) {
2298 atomic_inc(&ch->req_lim_delta);
2299 srpt_abort_cmd(ioctx);
2303 /* For read commands, transfer the data to the initiator. */
2304 if (ioctx->cmd.data_direction == DMA_FROM_DEVICE &&
2305 ioctx->cmd.data_length &&
2306 !ioctx->queue_status_only) {
2307 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2308 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2310 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,
2311 ch->sport->port, NULL, first_wr);
2315 if (state != SRPT_STATE_MGMT)
2316 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
2320 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
2321 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
2325 atomic_inc(&ch->req_lim);
2327 if (unlikely(atomic_sub_return(1 + ioctx->n_rdma,
2328 &ch->sq_wr_avail) < 0)) {
2329 pr_warn("%s: IB send queue full (needed %d)\n",
2330 __func__, ioctx->n_rdma);
2335 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len,
2338 sge.addr = ioctx->ioctx.dma;
2339 sge.length = resp_len;
2340 sge.lkey = sdev->pd->local_dma_lkey;
2342 ioctx->ioctx.cqe.done = srpt_send_done;
2343 send_wr.next = NULL;
2344 send_wr.wr_cqe = &ioctx->ioctx.cqe;
2345 send_wr.sg_list = &sge;
2346 send_wr.num_sge = 1;
2347 send_wr.opcode = IB_WR_SEND;
2348 send_wr.send_flags = IB_SEND_SIGNALED;
2350 ret = ib_post_send(ch->qp, first_wr, &bad_wr);
2352 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
2353 __func__, ioctx->cmd.tag, ret);
2360 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
2361 atomic_dec(&ch->req_lim);
2362 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
2363 target_put_sess_cmd(&ioctx->cmd);
2366 static int srpt_queue_data_in(struct se_cmd *cmd)
2368 srpt_queue_response(cmd);
2372 static void srpt_queue_tm_rsp(struct se_cmd *cmd)
2374 srpt_queue_response(cmd);
2377 static void srpt_aborted_task(struct se_cmd *cmd)
2381 static int srpt_queue_status(struct se_cmd *cmd)
2383 struct srpt_send_ioctx *ioctx;
2385 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
2386 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
2387 if (cmd->se_cmd_flags &
2388 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
2389 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
2390 ioctx->queue_status_only = true;
2391 srpt_queue_response(cmd);
2395 static void srpt_refresh_port_work(struct work_struct *work)
2397 struct srpt_port *sport = container_of(work, struct srpt_port, work);
2399 srpt_refresh_port(sport);
2403 * srpt_release_sdev() - Free the channel resources associated with a target.
2405 static int srpt_release_sdev(struct srpt_device *sdev)
2409 WARN_ON_ONCE(irqs_disabled());
2413 mutex_lock(&sdev->mutex);
2414 for (i = 0; i < ARRAY_SIZE(sdev->port); i++)
2415 sdev->port[i].enabled = false;
2416 __srpt_close_all_ch(sdev);
2417 mutex_unlock(&sdev->mutex);
2419 res = wait_event_interruptible(sdev->ch_releaseQ,
2420 list_empty_careful(&sdev->rch_list));
2422 pr_err("%s: interrupted.\n", __func__);
2427 static struct srpt_port *__srpt_lookup_port(const char *name)
2429 struct ib_device *dev;
2430 struct srpt_device *sdev;
2431 struct srpt_port *sport;
2434 list_for_each_entry(sdev, &srpt_dev_list, list) {
2439 for (i = 0; i < dev->phys_port_cnt; i++) {
2440 sport = &sdev->port[i];
2442 if (!strcmp(sport->port_guid, name))
2450 static struct srpt_port *srpt_lookup_port(const char *name)
2452 struct srpt_port *sport;
2454 spin_lock(&srpt_dev_lock);
2455 sport = __srpt_lookup_port(name);
2456 spin_unlock(&srpt_dev_lock);
2462 * srpt_add_one() - Infiniband device addition callback function.
2464 static void srpt_add_one(struct ib_device *device)
2466 struct srpt_device *sdev;
2467 struct srpt_port *sport;
2468 struct ib_srq_init_attr srq_attr;
2471 pr_debug("device = %p, device->dma_ops = %p\n", device,
2474 sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
2478 sdev->device = device;
2479 INIT_LIST_HEAD(&sdev->rch_list);
2480 init_waitqueue_head(&sdev->ch_releaseQ);
2481 mutex_init(&sdev->mutex);
2483 sdev->pd = ib_alloc_pd(device);
2484 if (IS_ERR(sdev->pd))
2487 sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
2489 srq_attr.event_handler = srpt_srq_event;
2490 srq_attr.srq_context = (void *)sdev;
2491 srq_attr.attr.max_wr = sdev->srq_size;
2492 srq_attr.attr.max_sge = 1;
2493 srq_attr.attr.srq_limit = 0;
2494 srq_attr.srq_type = IB_SRQT_BASIC;
2496 sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
2497 if (IS_ERR(sdev->srq))
2500 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
2501 __func__, sdev->srq_size, sdev->device->attrs.max_srq_wr,
2504 if (!srpt_service_guid)
2505 srpt_service_guid = be64_to_cpu(device->node_guid);
2507 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
2508 if (IS_ERR(sdev->cm_id))
2511 /* print out target login information */
2512 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
2513 "pkey=ffff,service_id=%016llx\n", srpt_service_guid,
2514 srpt_service_guid, srpt_service_guid);
2517 * We do not have a consistent service_id (ie. also id_ext of target_id)
2518 * to identify this target. We currently use the guid of the first HCA
2519 * in the system as service_id; therefore, the target_id will change
2520 * if this HCA is gone bad and replaced by different HCA
2522 if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0))
2525 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
2526 srpt_event_handler);
2527 if (ib_register_event_handler(&sdev->event_handler))
2530 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
2531 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
2532 sizeof(*sdev->ioctx_ring[0]),
2533 srp_max_req_size, DMA_FROM_DEVICE);
2534 if (!sdev->ioctx_ring)
2537 for (i = 0; i < sdev->srq_size; ++i)
2538 srpt_post_recv(sdev, sdev->ioctx_ring[i]);
2540 WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
2542 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
2543 sport = &sdev->port[i - 1];
2546 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
2547 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
2548 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
2549 INIT_WORK(&sport->work, srpt_refresh_port_work);
2551 if (srpt_refresh_port(sport)) {
2552 pr_err("MAD registration failed for %s-%d.\n",
2553 sdev->device->name, i);
2558 spin_lock(&srpt_dev_lock);
2559 list_add_tail(&sdev->list, &srpt_dev_list);
2560 spin_unlock(&srpt_dev_lock);
2563 ib_set_client_data(device, &srpt_client, sdev);
2564 pr_debug("added %s.\n", device->name);
2568 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
2569 sdev->srq_size, srp_max_req_size,
2572 ib_unregister_event_handler(&sdev->event_handler);
2574 ib_destroy_cm_id(sdev->cm_id);
2576 ib_destroy_srq(sdev->srq);
2578 ib_dealloc_pd(sdev->pd);
2583 pr_info("%s(%s) failed.\n", __func__, device->name);
2588 * srpt_remove_one() - InfiniBand device removal callback function.
2590 static void srpt_remove_one(struct ib_device *device, void *client_data)
2592 struct srpt_device *sdev = client_data;
2596 pr_info("%s(%s): nothing to do.\n", __func__, device->name);
2600 srpt_unregister_mad_agent(sdev);
2602 ib_unregister_event_handler(&sdev->event_handler);
2604 /* Cancel any work queued by the just unregistered IB event handler. */
2605 for (i = 0; i < sdev->device->phys_port_cnt; i++)
2606 cancel_work_sync(&sdev->port[i].work);
2608 ib_destroy_cm_id(sdev->cm_id);
2611 * Unregistering a target must happen after destroying sdev->cm_id
2612 * such that no new SRP_LOGIN_REQ information units can arrive while
2613 * destroying the target.
2615 spin_lock(&srpt_dev_lock);
2616 list_del(&sdev->list);
2617 spin_unlock(&srpt_dev_lock);
2618 srpt_release_sdev(sdev);
2620 ib_destroy_srq(sdev->srq);
2621 ib_dealloc_pd(sdev->pd);
2623 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
2624 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
2625 sdev->ioctx_ring = NULL;
2629 static struct ib_client srpt_client = {
2631 .add = srpt_add_one,
2632 .remove = srpt_remove_one
2635 static int srpt_check_true(struct se_portal_group *se_tpg)
2640 static int srpt_check_false(struct se_portal_group *se_tpg)
2645 static char *srpt_get_fabric_name(void)
2650 static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
2652 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
2654 return sport->port_guid;
2657 static u16 srpt_get_tag(struct se_portal_group *tpg)
2662 static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
2667 static void srpt_release_cmd(struct se_cmd *se_cmd)
2669 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
2670 struct srpt_send_ioctx, cmd);
2671 struct srpt_rdma_ch *ch = ioctx->ch;
2672 unsigned long flags;
2674 WARN_ON(ioctx->state != SRPT_STATE_DONE);
2676 if (ioctx->n_rw_ctx) {
2677 srpt_free_rw_ctxs(ch, ioctx);
2678 ioctx->n_rw_ctx = 0;
2681 spin_lock_irqsave(&ch->spinlock, flags);
2682 list_add(&ioctx->free_list, &ch->free_list);
2683 spin_unlock_irqrestore(&ch->spinlock, flags);
2687 * srpt_close_session() - Forcibly close a session.
2689 * Callback function invoked by the TCM core to clean up sessions associated
2690 * with a node ACL when the user invokes
2691 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2693 static void srpt_close_session(struct se_session *se_sess)
2695 DECLARE_COMPLETION_ONSTACK(release_done);
2696 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
2697 struct srpt_device *sdev = ch->sport->sdev;
2700 pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
2703 mutex_lock(&sdev->mutex);
2704 BUG_ON(ch->release_done);
2705 ch->release_done = &release_done;
2706 wait = !list_empty(&ch->list);
2707 srpt_disconnect_ch(ch);
2708 mutex_unlock(&sdev->mutex);
2713 while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0)
2714 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
2715 ch->sess_name, ch->qp->qp_num, ch->state);
2719 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
2721 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
2722 * This object represents an arbitrary integer used to uniquely identify a
2723 * particular attached remote initiator port to a particular SCSI target port
2724 * within a particular SCSI target device within a particular SCSI instance.
2726 static u32 srpt_sess_get_index(struct se_session *se_sess)
2731 static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
2735 /* Note: only used from inside debug printk's by the TCM core. */
2736 static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
2738 struct srpt_send_ioctx *ioctx;
2740 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2741 return srpt_get_cmd_state(ioctx);
2745 * srpt_parse_i_port_id() - Parse an initiator port ID.
2746 * @name: ASCII representation of a 128-bit initiator port ID.
2747 * @i_port_id: Binary 128-bit port ID.
2749 static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
2752 unsigned len, count, leading_zero_bytes;
2756 if (strncasecmp(p, "0x", 2) == 0)
2762 count = min(len / 2, 16U);
2763 leading_zero_bytes = 16 - count;
2764 memset(i_port_id, 0, leading_zero_bytes);
2765 rc = hex2bin(i_port_id + leading_zero_bytes, p, count);
2767 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc);
2774 * configfs callback function invoked for
2775 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2777 static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
2781 if (srpt_parse_i_port_id(i_port_id, name) < 0) {
2782 pr_err("invalid initiator port ID %s\n", name);
2788 static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,
2791 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2792 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2794 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
2797 static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,
2798 const char *page, size_t count)
2800 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2801 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2805 ret = kstrtoul(page, 0, &val);
2807 pr_err("kstrtoul() failed with ret: %d\n", ret);
2810 if (val > MAX_SRPT_RDMA_SIZE) {
2811 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
2812 MAX_SRPT_RDMA_SIZE);
2815 if (val < DEFAULT_MAX_RDMA_SIZE) {
2816 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
2817 val, DEFAULT_MAX_RDMA_SIZE);
2820 sport->port_attrib.srp_max_rdma_size = val;
2825 static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,
2828 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2829 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2831 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
2834 static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,
2835 const char *page, size_t count)
2837 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2838 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2842 ret = kstrtoul(page, 0, &val);
2844 pr_err("kstrtoul() failed with ret: %d\n", ret);
2847 if (val > MAX_SRPT_RSP_SIZE) {
2848 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
2852 if (val < MIN_MAX_RSP_SIZE) {
2853 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
2857 sport->port_attrib.srp_max_rsp_size = val;
2862 static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,
2865 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2866 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2868 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
2871 static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,
2872 const char *page, size_t count)
2874 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2875 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2879 ret = kstrtoul(page, 0, &val);
2881 pr_err("kstrtoul() failed with ret: %d\n", ret);
2884 if (val > MAX_SRPT_SRQ_SIZE) {
2885 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
2889 if (val < MIN_SRPT_SRQ_SIZE) {
2890 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
2894 sport->port_attrib.srp_sq_size = val;
2899 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);
2900 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);
2901 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);
2903 static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
2904 &srpt_tpg_attrib_attr_srp_max_rdma_size,
2905 &srpt_tpg_attrib_attr_srp_max_rsp_size,
2906 &srpt_tpg_attrib_attr_srp_sq_size,
2910 static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page)
2912 struct se_portal_group *se_tpg = to_tpg(item);
2913 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2915 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
2918 static ssize_t srpt_tpg_enable_store(struct config_item *item,
2919 const char *page, size_t count)
2921 struct se_portal_group *se_tpg = to_tpg(item);
2922 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2923 struct srpt_device *sdev = sport->sdev;
2924 struct srpt_rdma_ch *ch;
2928 ret = kstrtoul(page, 0, &tmp);
2930 pr_err("Unable to extract srpt_tpg_store_enable\n");
2934 if ((tmp != 0) && (tmp != 1)) {
2935 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
2938 if (sport->enabled == tmp)
2940 sport->enabled = tmp;
2944 mutex_lock(&sdev->mutex);
2945 list_for_each_entry(ch, &sdev->rch_list, list) {
2946 if (ch->sport == sport) {
2947 pr_debug("%s: ch %p %s-%d\n", __func__, ch,
2948 ch->sess_name, ch->qp->qp_num);
2949 srpt_disconnect_ch(ch);
2953 mutex_unlock(&sdev->mutex);
2959 CONFIGFS_ATTR(srpt_tpg_, enable);
2961 static struct configfs_attribute *srpt_tpg_attrs[] = {
2962 &srpt_tpg_attr_enable,
2967 * configfs callback invoked for
2968 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
2970 static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
2971 struct config_group *group,
2974 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
2977 /* Initialize sport->port_wwn and sport->port_tpg_1 */
2978 res = core_tpg_register(&sport->port_wwn, &sport->port_tpg_1, SCSI_PROTOCOL_SRP);
2980 return ERR_PTR(res);
2982 return &sport->port_tpg_1;
2986 * configfs callback invoked for
2987 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
2989 static void srpt_drop_tpg(struct se_portal_group *tpg)
2991 struct srpt_port *sport = container_of(tpg,
2992 struct srpt_port, port_tpg_1);
2994 sport->enabled = false;
2995 core_tpg_deregister(&sport->port_tpg_1);
2999 * configfs callback invoked for
3000 * mkdir /sys/kernel/config/target/$driver/$port
3002 static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3003 struct config_group *group,
3006 struct srpt_port *sport;
3009 sport = srpt_lookup_port(name);
3010 pr_debug("make_tport(%s)\n", name);
3015 return &sport->port_wwn;
3018 return ERR_PTR(ret);
3022 * configfs callback invoked for
3023 * rmdir /sys/kernel/config/target/$driver/$port
3025 static void srpt_drop_tport(struct se_wwn *wwn)
3027 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3029 pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item));
3032 static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)
3034 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3037 CONFIGFS_ATTR_RO(srpt_wwn_, version);
3039 static struct configfs_attribute *srpt_wwn_attrs[] = {
3040 &srpt_wwn_attr_version,
3044 static const struct target_core_fabric_ops srpt_template = {
3045 .module = THIS_MODULE,
3047 .get_fabric_name = srpt_get_fabric_name,
3048 .tpg_get_wwn = srpt_get_fabric_wwn,
3049 .tpg_get_tag = srpt_get_tag,
3050 .tpg_check_demo_mode = srpt_check_false,
3051 .tpg_check_demo_mode_cache = srpt_check_true,
3052 .tpg_check_demo_mode_write_protect = srpt_check_true,
3053 .tpg_check_prod_mode_write_protect = srpt_check_false,
3054 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3055 .release_cmd = srpt_release_cmd,
3056 .check_stop_free = srpt_check_stop_free,
3057 .close_session = srpt_close_session,
3058 .sess_get_index = srpt_sess_get_index,
3059 .sess_get_initiator_sid = NULL,
3060 .write_pending = srpt_write_pending,
3061 .write_pending_status = srpt_write_pending_status,
3062 .set_default_node_attributes = srpt_set_default_node_attrs,
3063 .get_cmd_state = srpt_get_tcm_cmd_state,
3064 .queue_data_in = srpt_queue_data_in,
3065 .queue_status = srpt_queue_status,
3066 .queue_tm_rsp = srpt_queue_tm_rsp,
3067 .aborted_task = srpt_aborted_task,
3069 * Setup function pointers for generic logic in
3070 * target_core_fabric_configfs.c
3072 .fabric_make_wwn = srpt_make_tport,
3073 .fabric_drop_wwn = srpt_drop_tport,
3074 .fabric_make_tpg = srpt_make_tpg,
3075 .fabric_drop_tpg = srpt_drop_tpg,
3076 .fabric_init_nodeacl = srpt_init_nodeacl,
3078 .tfc_wwn_attrs = srpt_wwn_attrs,
3079 .tfc_tpg_base_attrs = srpt_tpg_attrs,
3080 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
3084 * srpt_init_module() - Kernel module initialization.
3086 * Note: Since ib_register_client() registers callback functions, and since at
3087 * least one of these callback functions (srpt_add_one()) calls target core
3088 * functions, this driver must be registered with the target core before
3089 * ib_register_client() is called.
3091 static int __init srpt_init_module(void)
3096 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
3097 pr_err("invalid value %d for kernel module parameter"
3098 " srp_max_req_size -- must be at least %d.\n",
3099 srp_max_req_size, MIN_MAX_REQ_SIZE);
3103 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3104 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
3105 pr_err("invalid value %d for kernel module parameter"
3106 " srpt_srq_size -- must be in the range [%d..%d].\n",
3107 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3111 ret = target_register_template(&srpt_template);
3115 ret = ib_register_client(&srpt_client);
3117 pr_err("couldn't register IB client\n");
3118 goto out_unregister_target;
3123 out_unregister_target:
3124 target_unregister_template(&srpt_template);
3129 static void __exit srpt_cleanup_module(void)
3131 ib_unregister_client(&srpt_client);
3132 target_unregister_template(&srpt_template);
3135 module_init(srpt_init_module);
3136 module_exit(srpt_cleanup_module);