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 if (!sport->mad_agent) {
526 memset(®_req, 0, sizeof(reg_req));
527 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
528 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
529 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
530 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
532 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
536 srpt_mad_send_handler,
537 srpt_mad_recv_handler,
539 if (IS_ERR(sport->mad_agent)) {
540 ret = PTR_ERR(sport->mad_agent);
541 sport->mad_agent = NULL;
550 port_modify.set_port_cap_mask = 0;
551 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
552 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
560 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
562 * Note: It is safe to call this function more than once for the same device.
564 static void srpt_unregister_mad_agent(struct srpt_device *sdev)
566 struct ib_port_modify port_modify = {
567 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
569 struct srpt_port *sport;
572 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
573 sport = &sdev->port[i - 1];
574 WARN_ON(sport->port != i);
575 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
576 pr_err("disabling MAD processing failed.\n");
577 if (sport->mad_agent) {
578 ib_unregister_mad_agent(sport->mad_agent);
579 sport->mad_agent = NULL;
585 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
587 static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
588 int ioctx_size, int dma_size,
589 enum dma_data_direction dir)
591 struct srpt_ioctx *ioctx;
593 ioctx = kmalloc(ioctx_size, GFP_KERNEL);
597 ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
601 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
602 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
616 * srpt_free_ioctx() - Free an SRPT I/O context structure.
618 static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
619 int dma_size, enum dma_data_direction dir)
624 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
630 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
631 * @sdev: Device to allocate the I/O context ring for.
632 * @ring_size: Number of elements in the I/O context ring.
633 * @ioctx_size: I/O context size.
634 * @dma_size: DMA buffer size.
635 * @dir: DMA data direction.
637 static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
638 int ring_size, int ioctx_size,
639 int dma_size, enum dma_data_direction dir)
641 struct srpt_ioctx **ring;
644 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
645 && ioctx_size != sizeof(struct srpt_send_ioctx));
647 ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
650 for (i = 0; i < ring_size; ++i) {
651 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
660 srpt_free_ioctx(sdev, ring[i], dma_size, dir);
668 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
670 static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
671 struct srpt_device *sdev, int ring_size,
672 int dma_size, enum dma_data_direction dir)
676 for (i = 0; i < ring_size; ++i)
677 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
682 * srpt_get_cmd_state() - Get the state of a SCSI command.
684 static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx)
686 enum srpt_command_state state;
691 spin_lock_irqsave(&ioctx->spinlock, flags);
692 state = ioctx->state;
693 spin_unlock_irqrestore(&ioctx->spinlock, flags);
698 * srpt_set_cmd_state() - Set the state of a SCSI command.
700 * Does not modify the state of aborted commands. Returns the previous command
703 static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
704 enum srpt_command_state new)
706 enum srpt_command_state previous;
711 spin_lock_irqsave(&ioctx->spinlock, flags);
712 previous = ioctx->state;
713 if (previous != SRPT_STATE_DONE)
715 spin_unlock_irqrestore(&ioctx->spinlock, flags);
721 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
723 * Returns true if and only if the previous command state was equal to 'old'.
725 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
726 enum srpt_command_state old,
727 enum srpt_command_state new)
729 enum srpt_command_state previous;
733 WARN_ON(old == SRPT_STATE_DONE);
734 WARN_ON(new == SRPT_STATE_NEW);
736 spin_lock_irqsave(&ioctx->spinlock, flags);
737 previous = ioctx->state;
740 spin_unlock_irqrestore(&ioctx->spinlock, flags);
741 return previous == old;
745 * srpt_post_recv() - Post an IB receive request.
747 static int srpt_post_recv(struct srpt_device *sdev,
748 struct srpt_recv_ioctx *ioctx)
751 struct ib_recv_wr wr, *bad_wr;
754 list.addr = ioctx->ioctx.dma;
755 list.length = srp_max_req_size;
756 list.lkey = sdev->pd->local_dma_lkey;
758 ioctx->ioctx.cqe.done = srpt_recv_done;
759 wr.wr_cqe = &ioctx->ioctx.cqe;
764 return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
768 * srpt_zerolength_write() - Perform a zero-length RDMA write.
770 * A quote from the InfiniBand specification: C9-88: For an HCA responder
771 * using Reliable Connection service, for each zero-length RDMA READ or WRITE
772 * request, the R_Key shall not be validated, even if the request includes
775 static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
777 struct ib_send_wr wr, *bad_wr;
779 memset(&wr, 0, sizeof(wr));
780 wr.opcode = IB_WR_RDMA_WRITE;
781 wr.wr_cqe = &ch->zw_cqe;
782 wr.send_flags = IB_SEND_SIGNALED;
783 return ib_post_send(ch->qp, &wr, &bad_wr);
786 static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
788 struct srpt_rdma_ch *ch = cq->cq_context;
790 if (wc->status == IB_WC_SUCCESS) {
791 srpt_process_wait_list(ch);
793 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
794 schedule_work(&ch->release_work);
796 WARN_ONCE(1, "%s-%d\n", ch->sess_name, ch->qp->qp_num);
800 static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
801 struct srp_direct_buf *db, int nbufs, struct scatterlist **sg,
804 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
805 struct srpt_rdma_ch *ch = ioctx->ch;
806 struct scatterlist *prev = NULL;
811 ioctx->rw_ctxs = &ioctx->s_rw_ctx;
813 ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs),
819 for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) {
820 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
821 u64 remote_addr = be64_to_cpu(db->va);
822 u32 size = be32_to_cpu(db->len);
823 u32 rkey = be32_to_cpu(db->key);
825 ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false,
830 ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port,
831 ctx->sg, ctx->nents, 0, remote_addr, rkey, dir);
833 target_free_sgl(ctx->sg, ctx->nents);
837 ioctx->n_rdma += ret;
841 sg_unmark_end(&prev[prev_nents - 1]);
842 sg_chain(prev, prev_nents + 1, ctx->sg);
848 prev_nents = ctx->nents;
850 *sg_cnt += ctx->nents;
857 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
859 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
860 ctx->sg, ctx->nents, dir);
861 target_free_sgl(ctx->sg, ctx->nents);
863 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
864 kfree(ioctx->rw_ctxs);
868 static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch,
869 struct srpt_send_ioctx *ioctx)
871 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
874 for (i = 0; i < ioctx->n_rw_ctx; i++) {
875 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
877 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
878 ctx->sg, ctx->nents, dir);
879 target_free_sgl(ctx->sg, ctx->nents);
882 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
883 kfree(ioctx->rw_ctxs);
886 static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
889 * The pointer computations below will only be compiled correctly
890 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
891 * whether srp_cmd::add_data has been declared as a byte pointer.
893 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&
894 !__same_type(srp_cmd->add_data[0], (u8)0));
897 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
898 * CDB LENGTH' field are reserved and the size in bytes of this field
899 * is four times the value specified in bits 3..7. Hence the "& ~3".
901 return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3);
905 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
906 * @ioctx: Pointer to the I/O context associated with the request.
907 * @srp_cmd: Pointer to the SRP_CMD request data.
908 * @dir: Pointer to the variable to which the transfer direction will be
910 * @data_len: Pointer to the variable to which the total data length of all
911 * descriptors in the SRP_CMD request will be written.
913 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
915 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
916 * -ENOMEM when memory allocation fails and zero upon success.
918 static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
919 struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
920 struct scatterlist **sg, unsigned *sg_cnt, u64 *data_len)
926 * The lower four bits of the buffer format field contain the DATA-IN
927 * buffer descriptor format, and the highest four bits contain the
928 * DATA-OUT buffer descriptor format.
930 if (srp_cmd->buf_fmt & 0xf)
931 /* DATA-IN: transfer data from target to initiator (read). */
932 *dir = DMA_FROM_DEVICE;
933 else if (srp_cmd->buf_fmt >> 4)
934 /* DATA-OUT: transfer data from initiator to target (write). */
935 *dir = DMA_TO_DEVICE;
939 /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
940 ioctx->cmd.data_direction = *dir;
942 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
943 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
944 struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd);
946 *data_len = be32_to_cpu(db->len);
947 return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt);
948 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
949 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
950 struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd);
951 int nbufs = be32_to_cpu(idb->table_desc.len) /
952 sizeof(struct srp_direct_buf);
955 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
956 pr_err("received unsupported SRP_CMD request"
957 " type (%u out + %u in != %u / %zu)\n",
958 srp_cmd->data_out_desc_cnt,
959 srp_cmd->data_in_desc_cnt,
960 be32_to_cpu(idb->table_desc.len),
961 sizeof(struct srp_direct_buf));
965 *data_len = be32_to_cpu(idb->len);
966 return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs,
975 * srpt_init_ch_qp() - Initialize queue pair attributes.
977 * Initialized the attributes of queue pair 'qp' by allowing local write,
978 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
980 static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
982 struct ib_qp_attr *attr;
985 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
989 attr->qp_state = IB_QPS_INIT;
990 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
991 IB_ACCESS_REMOTE_WRITE;
992 attr->port_num = ch->sport->port;
993 attr->pkey_index = 0;
995 ret = ib_modify_qp(qp, attr,
996 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
1004 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
1005 * @ch: channel of the queue pair.
1006 * @qp: queue pair to change the state of.
1008 * Returns zero upon success and a negative value upon failure.
1010 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1011 * If this structure ever becomes larger, it might be necessary to allocate
1012 * it dynamically instead of on the stack.
1014 static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1016 struct ib_qp_attr qp_attr;
1020 qp_attr.qp_state = IB_QPS_RTR;
1021 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1025 qp_attr.max_dest_rd_atomic = 4;
1027 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1034 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1035 * @ch: channel of the queue pair.
1036 * @qp: queue pair to change the state of.
1038 * Returns zero upon success and a negative value upon failure.
1040 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1041 * If this structure ever becomes larger, it might be necessary to allocate
1042 * it dynamically instead of on the stack.
1044 static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1046 struct ib_qp_attr qp_attr;
1050 qp_attr.qp_state = IB_QPS_RTS;
1051 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1055 qp_attr.max_rd_atomic = 4;
1057 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1064 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1066 static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1068 struct ib_qp_attr qp_attr;
1070 qp_attr.qp_state = IB_QPS_ERR;
1071 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1075 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1077 static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1079 struct srpt_send_ioctx *ioctx;
1080 unsigned long flags;
1085 spin_lock_irqsave(&ch->spinlock, flags);
1086 if (!list_empty(&ch->free_list)) {
1087 ioctx = list_first_entry(&ch->free_list,
1088 struct srpt_send_ioctx, free_list);
1089 list_del(&ioctx->free_list);
1091 spin_unlock_irqrestore(&ch->spinlock, flags);
1096 BUG_ON(ioctx->ch != ch);
1097 spin_lock_init(&ioctx->spinlock);
1098 ioctx->state = SRPT_STATE_NEW;
1100 ioctx->n_rw_ctx = 0;
1101 init_completion(&ioctx->tx_done);
1102 ioctx->queue_status_only = false;
1104 * transport_init_se_cmd() does not initialize all fields, so do it
1107 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1108 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1114 * srpt_abort_cmd() - Abort a SCSI command.
1115 * @ioctx: I/O context associated with the SCSI command.
1116 * @context: Preferred execution context.
1118 static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1120 enum srpt_command_state state;
1121 unsigned long flags;
1126 * If the command is in a state where the target core is waiting for
1127 * the ib_srpt driver, change the state to the next state.
1130 spin_lock_irqsave(&ioctx->spinlock, flags);
1131 state = ioctx->state;
1133 case SRPT_STATE_NEED_DATA:
1134 ioctx->state = SRPT_STATE_DATA_IN;
1136 case SRPT_STATE_CMD_RSP_SENT:
1137 case SRPT_STATE_MGMT_RSP_SENT:
1138 ioctx->state = SRPT_STATE_DONE;
1141 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1145 spin_unlock_irqrestore(&ioctx->spinlock, flags);
1147 pr_debug("Aborting cmd with state %d and tag %lld\n", state,
1151 case SRPT_STATE_NEW:
1152 case SRPT_STATE_DATA_IN:
1153 case SRPT_STATE_MGMT:
1154 case SRPT_STATE_DONE:
1156 * Do nothing - defer abort processing until
1157 * srpt_queue_response() is invoked.
1160 case SRPT_STATE_NEED_DATA:
1161 pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);
1162 transport_generic_request_failure(&ioctx->cmd,
1163 TCM_CHECK_CONDITION_ABORT_CMD);
1165 case SRPT_STATE_CMD_RSP_SENT:
1167 * SRP_RSP sending failed or the SRP_RSP send completion has
1168 * not been received in time.
1170 transport_generic_free_cmd(&ioctx->cmd, 0);
1172 case SRPT_STATE_MGMT_RSP_SENT:
1173 transport_generic_free_cmd(&ioctx->cmd, 0);
1176 WARN(1, "Unexpected command state (%d)", state);
1184 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1185 * the data that has been transferred via IB RDMA had to be postponed until the
1186 * check_stop_free() callback. None of this is necessary anymore and needs to
1189 static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1191 struct srpt_rdma_ch *ch = cq->cq_context;
1192 struct srpt_send_ioctx *ioctx =
1193 container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
1195 WARN_ON(ioctx->n_rdma <= 0);
1196 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1199 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1200 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1202 srpt_abort_cmd(ioctx);
1206 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1207 SRPT_STATE_DATA_IN))
1208 target_execute_cmd(&ioctx->cmd);
1210 pr_err("%s[%d]: wrong state = %d\n", __func__,
1211 __LINE__, srpt_get_cmd_state(ioctx));
1215 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1216 * @ch: RDMA channel through which the request has been received.
1217 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1218 * be built in the buffer ioctx->buf points at and hence this function will
1219 * overwrite the request data.
1220 * @tag: tag of the request for which this response is being generated.
1221 * @status: value for the STATUS field of the SRP_RSP information unit.
1223 * Returns the size in bytes of the SRP_RSP response.
1225 * An SRP_RSP response contains a SCSI status or service response. See also
1226 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1227 * response. See also SPC-2 for more information about sense data.
1229 static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1230 struct srpt_send_ioctx *ioctx, u64 tag,
1233 struct srp_rsp *srp_rsp;
1234 const u8 *sense_data;
1235 int sense_data_len, max_sense_len;
1238 * The lowest bit of all SAM-3 status codes is zero (see also
1239 * paragraph 5.3 in SAM-3).
1241 WARN_ON(status & 1);
1243 srp_rsp = ioctx->ioctx.buf;
1246 sense_data = ioctx->sense_data;
1247 sense_data_len = ioctx->cmd.scsi_sense_length;
1248 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1250 memset(srp_rsp, 0, sizeof(*srp_rsp));
1251 srp_rsp->opcode = SRP_RSP;
1252 srp_rsp->req_lim_delta =
1253 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1255 srp_rsp->status = status;
1257 if (sense_data_len) {
1258 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1259 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1260 if (sense_data_len > max_sense_len) {
1261 pr_warn("truncated sense data from %d to %d"
1262 " bytes\n", sense_data_len, max_sense_len);
1263 sense_data_len = max_sense_len;
1266 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1267 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1268 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1271 return sizeof(*srp_rsp) + sense_data_len;
1275 * srpt_build_tskmgmt_rsp() - Build a task management response.
1276 * @ch: RDMA channel through which the request has been received.
1277 * @ioctx: I/O context in which the SRP_RSP response will be built.
1278 * @rsp_code: RSP_CODE that will be stored in the response.
1279 * @tag: Tag of the request for which this response is being generated.
1281 * Returns the size in bytes of the SRP_RSP response.
1283 * An SRP_RSP response contains a SCSI status or service response. See also
1284 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1287 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1288 struct srpt_send_ioctx *ioctx,
1289 u8 rsp_code, u64 tag)
1291 struct srp_rsp *srp_rsp;
1296 resp_len = sizeof(*srp_rsp) + resp_data_len;
1298 srp_rsp = ioctx->ioctx.buf;
1300 memset(srp_rsp, 0, sizeof(*srp_rsp));
1302 srp_rsp->opcode = SRP_RSP;
1303 srp_rsp->req_lim_delta =
1304 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1307 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1308 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1309 srp_rsp->data[3] = rsp_code;
1314 static int srpt_check_stop_free(struct se_cmd *cmd)
1316 struct srpt_send_ioctx *ioctx = container_of(cmd,
1317 struct srpt_send_ioctx, cmd);
1319 return target_put_sess_cmd(&ioctx->cmd);
1323 * srpt_handle_cmd() - Process SRP_CMD.
1325 static void srpt_handle_cmd(struct srpt_rdma_ch *ch,
1326 struct srpt_recv_ioctx *recv_ioctx,
1327 struct srpt_send_ioctx *send_ioctx)
1330 struct srp_cmd *srp_cmd;
1331 struct scatterlist *sg = NULL;
1332 unsigned sg_cnt = 0;
1334 enum dma_data_direction dir;
1337 BUG_ON(!send_ioctx);
1339 srp_cmd = recv_ioctx->ioctx.buf;
1340 cmd = &send_ioctx->cmd;
1341 cmd->tag = srp_cmd->tag;
1343 switch (srp_cmd->task_attr) {
1344 case SRP_CMD_SIMPLE_Q:
1345 cmd->sam_task_attr = TCM_SIMPLE_TAG;
1347 case SRP_CMD_ORDERED_Q:
1349 cmd->sam_task_attr = TCM_ORDERED_TAG;
1351 case SRP_CMD_HEAD_OF_Q:
1352 cmd->sam_task_attr = TCM_HEAD_TAG;
1355 cmd->sam_task_attr = TCM_ACA_TAG;
1359 rc = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &sg, &sg_cnt,
1362 if (rc != -EAGAIN) {
1363 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1369 rc = target_submit_cmd_map_sgls(cmd, ch->sess, srp_cmd->cdb,
1370 &send_ioctx->sense_data[0],
1371 scsilun_to_int(&srp_cmd->lun), data_len,
1372 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF,
1373 sg, sg_cnt, NULL, 0, NULL, 0);
1375 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,
1382 send_ioctx->state = SRPT_STATE_DONE;
1383 srpt_release_cmd(cmd);
1386 static int srp_tmr_to_tcm(int fn)
1389 case SRP_TSK_ABORT_TASK:
1390 return TMR_ABORT_TASK;
1391 case SRP_TSK_ABORT_TASK_SET:
1392 return TMR_ABORT_TASK_SET;
1393 case SRP_TSK_CLEAR_TASK_SET:
1394 return TMR_CLEAR_TASK_SET;
1395 case SRP_TSK_LUN_RESET:
1396 return TMR_LUN_RESET;
1397 case SRP_TSK_CLEAR_ACA:
1398 return TMR_CLEAR_ACA;
1405 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1407 * Returns 0 if and only if the request will be processed by the target core.
1409 * For more information about SRP_TSK_MGMT information units, see also section
1410 * 6.7 in the SRP r16a document.
1412 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1413 struct srpt_recv_ioctx *recv_ioctx,
1414 struct srpt_send_ioctx *send_ioctx)
1416 struct srp_tsk_mgmt *srp_tsk;
1418 struct se_session *sess = ch->sess;
1422 BUG_ON(!send_ioctx);
1424 srp_tsk = recv_ioctx->ioctx.buf;
1425 cmd = &send_ioctx->cmd;
1427 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1428 " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func,
1429 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
1431 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
1432 send_ioctx->cmd.tag = srp_tsk->tag;
1433 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
1434 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,
1435 scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,
1436 GFP_KERNEL, srp_tsk->task_tag,
1437 TARGET_SCF_ACK_KREF);
1439 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
1444 transport_send_check_condition_and_sense(cmd, 0, 0); // XXX:
1448 * srpt_handle_new_iu() - Process a newly received information unit.
1449 * @ch: RDMA channel through which the information unit has been received.
1450 * @ioctx: SRPT I/O context associated with the information unit.
1452 static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
1453 struct srpt_recv_ioctx *recv_ioctx,
1454 struct srpt_send_ioctx *send_ioctx)
1456 struct srp_cmd *srp_cmd;
1459 BUG_ON(!recv_ioctx);
1461 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1462 recv_ioctx->ioctx.dma, srp_max_req_size,
1465 if (unlikely(ch->state == CH_CONNECTING))
1468 if (unlikely(ch->state != CH_LIVE))
1471 srp_cmd = recv_ioctx->ioctx.buf;
1472 if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
1474 if (!list_empty(&ch->cmd_wait_list))
1476 send_ioctx = srpt_get_send_ioctx(ch);
1478 if (unlikely(!send_ioctx))
1482 switch (srp_cmd->opcode) {
1484 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1487 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1490 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1493 pr_debug("received SRP_CRED_RSP\n");
1496 pr_debug("received SRP_AER_RSP\n");
1499 pr_err("Received SRP_RSP\n");
1502 pr_err("received IU with unknown opcode 0x%x\n",
1507 srpt_post_recv(ch->sport->sdev, recv_ioctx);
1511 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1514 static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1516 struct srpt_rdma_ch *ch = cq->cq_context;
1517 struct srpt_recv_ioctx *ioctx =
1518 container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
1520 if (wc->status == IB_WC_SUCCESS) {
1523 req_lim = atomic_dec_return(&ch->req_lim);
1524 if (unlikely(req_lim < 0))
1525 pr_err("req_lim = %d < 0\n", req_lim);
1526 srpt_handle_new_iu(ch, ioctx, NULL);
1528 pr_info("receiving failed for ioctx %p with status %d\n",
1534 * This function must be called from the context in which RDMA completions are
1535 * processed because it accesses the wait list without protection against
1536 * access from other threads.
1538 static void srpt_process_wait_list(struct srpt_rdma_ch *ch)
1540 struct srpt_send_ioctx *ioctx;
1542 while (!list_empty(&ch->cmd_wait_list) &&
1543 ch->state >= CH_LIVE &&
1544 (ioctx = srpt_get_send_ioctx(ch)) != NULL) {
1545 struct srpt_recv_ioctx *recv_ioctx;
1547 recv_ioctx = list_first_entry(&ch->cmd_wait_list,
1548 struct srpt_recv_ioctx,
1550 list_del(&recv_ioctx->wait_list);
1551 srpt_handle_new_iu(ch, recv_ioctx, ioctx);
1556 * Note: Although this has not yet been observed during tests, at least in
1557 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1558 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1559 * value in each response is set to one, and it is possible that this response
1560 * makes the initiator send a new request before the send completion for that
1561 * response has been processed. This could e.g. happen if the call to
1562 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1563 * if IB retransmission causes generation of the send completion to be
1564 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1565 * are queued on cmd_wait_list. The code below processes these delayed
1566 * requests one at a time.
1568 static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
1570 struct srpt_rdma_ch *ch = cq->cq_context;
1571 struct srpt_send_ioctx *ioctx =
1572 container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
1573 enum srpt_command_state state;
1575 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1577 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
1578 state != SRPT_STATE_MGMT_RSP_SENT);
1580 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
1582 if (wc->status != IB_WC_SUCCESS)
1583 pr_info("sending response for ioctx 0x%p failed"
1584 " with status %d\n", ioctx, wc->status);
1586 if (state != SRPT_STATE_DONE) {
1587 transport_generic_free_cmd(&ioctx->cmd, 0);
1589 pr_err("IB completion has been received too late for"
1590 " wr_id = %u.\n", ioctx->ioctx.index);
1593 srpt_process_wait_list(ch);
1597 * srpt_create_ch_ib() - Create receive and send completion queues.
1599 static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
1601 struct ib_qp_init_attr *qp_init;
1602 struct srpt_port *sport = ch->sport;
1603 struct srpt_device *sdev = sport->sdev;
1604 const struct ib_device_attr *attrs = &sdev->device->attrs;
1605 u32 srp_sq_size = sport->port_attrib.srp_sq_size;
1608 WARN_ON(ch->rq_size < 1);
1611 qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);
1616 ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + srp_sq_size,
1617 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE);
1618 if (IS_ERR(ch->cq)) {
1619 ret = PTR_ERR(ch->cq);
1620 pr_err("failed to create CQ cqe= %d ret= %d\n",
1621 ch->rq_size + srp_sq_size, ret);
1625 qp_init->qp_context = (void *)ch;
1626 qp_init->event_handler
1627 = (void(*)(struct ib_event *, void*))srpt_qp_event;
1628 qp_init->send_cq = ch->cq;
1629 qp_init->recv_cq = ch->cq;
1630 qp_init->srq = sdev->srq;
1631 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
1632 qp_init->qp_type = IB_QPT_RC;
1634 * We divide up our send queue size into half SEND WRs to send the
1635 * completions, and half R/W contexts to actually do the RDMA
1636 * READ/WRITE transfers. Note that we need to allocate CQ slots for
1637 * both both, as RDMA contexts will also post completions for the
1640 qp_init->cap.max_send_wr = srp_sq_size / 2;
1641 qp_init->cap.max_rdma_ctxs = srp_sq_size / 2;
1642 qp_init->cap.max_send_sge = min(attrs->max_sge, SRPT_MAX_SG_PER_WQE);
1643 qp_init->port_num = ch->sport->port;
1645 ch->qp = ib_create_qp(sdev->pd, qp_init);
1646 if (IS_ERR(ch->qp)) {
1647 ret = PTR_ERR(ch->qp);
1648 if (ret == -ENOMEM) {
1650 if (srp_sq_size >= MIN_SRPT_SQ_SIZE) {
1651 ib_destroy_cq(ch->cq);
1655 pr_err("failed to create_qp ret= %d\n", ret);
1656 goto err_destroy_cq;
1659 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
1661 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1662 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
1663 qp_init->cap.max_send_wr, ch->cm_id);
1665 ret = srpt_init_ch_qp(ch, ch->qp);
1667 goto err_destroy_qp;
1674 ib_destroy_qp(ch->qp);
1680 static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
1682 ib_destroy_qp(ch->qp);
1687 * srpt_close_ch() - Close an RDMA channel.
1689 * Make sure all resources associated with the channel will be deallocated at
1690 * an appropriate time.
1692 * Returns true if and only if the channel state has been modified into
1695 static bool srpt_close_ch(struct srpt_rdma_ch *ch)
1699 if (!srpt_set_ch_state(ch, CH_DRAINING)) {
1700 pr_debug("%s-%d: already closed\n", ch->sess_name,
1705 kref_get(&ch->kref);
1707 ret = srpt_ch_qp_err(ch);
1709 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1710 ch->sess_name, ch->qp->qp_num, ret);
1712 pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
1714 ret = srpt_zerolength_write(ch);
1716 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1717 ch->sess_name, ch->qp->qp_num, ret);
1718 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
1719 schedule_work(&ch->release_work);
1724 kref_put(&ch->kref, srpt_free_ch);
1730 * Change the channel state into CH_DISCONNECTING. If a channel has not yet
1731 * reached the connected state, close it. If a channel is in the connected
1732 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
1733 * the responsibility of the caller to ensure that this function is not
1734 * invoked concurrently with the code that accepts a connection. This means
1735 * that this function must either be invoked from inside a CM callback
1736 * function or that it must be invoked with the srpt_port.mutex held.
1738 static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
1742 if (!srpt_set_ch_state(ch, CH_DISCONNECTING))
1745 ret = ib_send_cm_dreq(ch->cm_id, NULL, 0);
1747 ret = ib_send_cm_drep(ch->cm_id, NULL, 0);
1749 if (ret < 0 && srpt_close_ch(ch))
1755 static void __srpt_close_all_ch(struct srpt_device *sdev)
1757 struct srpt_rdma_ch *ch;
1759 lockdep_assert_held(&sdev->mutex);
1761 list_for_each_entry(ch, &sdev->rch_list, list) {
1762 if (srpt_disconnect_ch(ch) >= 0)
1763 pr_info("Closing channel %s-%d because target %s has been disabled\n",
1764 ch->sess_name, ch->qp->qp_num,
1765 sdev->device->name);
1770 static void srpt_free_ch(struct kref *kref)
1772 struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);
1777 static void srpt_release_channel_work(struct work_struct *w)
1779 struct srpt_rdma_ch *ch;
1780 struct srpt_device *sdev;
1781 struct se_session *se_sess;
1783 ch = container_of(w, struct srpt_rdma_ch, release_work);
1784 pr_debug("%s: %s-%d; release_done = %p\n", __func__, ch->sess_name,
1785 ch->qp->qp_num, ch->release_done);
1787 sdev = ch->sport->sdev;
1793 target_sess_cmd_list_set_waiting(se_sess);
1794 target_wait_for_sess_cmds(se_sess);
1796 transport_deregister_session_configfs(se_sess);
1797 transport_deregister_session(se_sess);
1800 ib_destroy_cm_id(ch->cm_id);
1802 srpt_destroy_ch_ib(ch);
1804 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
1805 ch->sport->sdev, ch->rq_size,
1806 ch->rsp_size, DMA_TO_DEVICE);
1808 mutex_lock(&sdev->mutex);
1809 list_del_init(&ch->list);
1810 if (ch->release_done)
1811 complete(ch->release_done);
1812 mutex_unlock(&sdev->mutex);
1814 wake_up(&sdev->ch_releaseQ);
1816 kref_put(&ch->kref, srpt_free_ch);
1820 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
1822 * Ownership of the cm_id is transferred to the target session if this
1823 * functions returns zero. Otherwise the caller remains the owner of cm_id.
1825 static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
1826 struct ib_cm_req_event_param *param,
1829 struct srpt_device *sdev = cm_id->context;
1830 struct srpt_port *sport = &sdev->port[param->port - 1];
1831 struct srp_login_req *req;
1832 struct srp_login_rsp *rsp;
1833 struct srp_login_rej *rej;
1834 struct ib_cm_rep_param *rep_param;
1835 struct srpt_rdma_ch *ch, *tmp_ch;
1840 WARN_ON_ONCE(irqs_disabled());
1842 if (WARN_ON(!sdev || !private_data))
1845 req = (struct srp_login_req *)private_data;
1847 it_iu_len = be32_to_cpu(req->req_it_iu_len);
1849 pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
1850 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
1851 " (guid=0x%llx:0x%llx)\n",
1852 be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
1853 be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
1854 be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
1855 be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
1858 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
1859 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
1861 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
1862 rej = kzalloc(sizeof(*rej), GFP_KERNEL);
1863 rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);
1865 if (!rsp || !rej || !rep_param) {
1870 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
1871 rej->reason = cpu_to_be32(
1872 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
1874 pr_err("rejected SRP_LOGIN_REQ because its"
1875 " length (%d bytes) is out of range (%d .. %d)\n",
1876 it_iu_len, 64, srp_max_req_size);
1880 if (!sport->enabled) {
1881 rej->reason = cpu_to_be32(
1882 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
1884 pr_err("rejected SRP_LOGIN_REQ because the target port"
1885 " has not yet been enabled\n");
1889 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
1890 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
1892 mutex_lock(&sdev->mutex);
1894 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
1895 if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
1896 && !memcmp(ch->t_port_id, req->target_port_id, 16)
1897 && param->port == ch->sport->port
1898 && param->listen_id == ch->sport->sdev->cm_id
1900 if (srpt_disconnect_ch(ch) < 0)
1902 pr_info("Relogin - closed existing channel %s\n",
1905 SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
1909 mutex_unlock(&sdev->mutex);
1912 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
1914 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
1915 || *(__be64 *)(req->target_port_id + 8) !=
1916 cpu_to_be64(srpt_service_guid)) {
1917 rej->reason = cpu_to_be32(
1918 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
1920 pr_err("rejected SRP_LOGIN_REQ because it"
1921 " has an invalid target port identifier.\n");
1925 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
1927 rej->reason = cpu_to_be32(
1928 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
1929 pr_err("rejected SRP_LOGIN_REQ because no memory.\n");
1934 kref_init(&ch->kref);
1935 ch->zw_cqe.done = srpt_zerolength_write_done;
1936 INIT_WORK(&ch->release_work, srpt_release_channel_work);
1937 memcpy(ch->i_port_id, req->initiator_port_id, 16);
1938 memcpy(ch->t_port_id, req->target_port_id, 16);
1939 ch->sport = &sdev->port[param->port - 1];
1941 cm_id->context = ch;
1943 * Avoid QUEUE_FULL conditions by limiting the number of buffers used
1944 * for the SRP protocol to the command queue size.
1946 ch->rq_size = SRPT_RQ_SIZE;
1947 spin_lock_init(&ch->spinlock);
1948 ch->state = CH_CONNECTING;
1949 INIT_LIST_HEAD(&ch->cmd_wait_list);
1950 ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
1952 ch->ioctx_ring = (struct srpt_send_ioctx **)
1953 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
1954 sizeof(*ch->ioctx_ring[0]),
1955 ch->rsp_size, DMA_TO_DEVICE);
1956 if (!ch->ioctx_ring)
1959 INIT_LIST_HEAD(&ch->free_list);
1960 for (i = 0; i < ch->rq_size; i++) {
1961 ch->ioctx_ring[i]->ch = ch;
1962 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
1965 ret = srpt_create_ch_ib(ch);
1967 rej->reason = cpu_to_be32(
1968 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
1969 pr_err("rejected SRP_LOGIN_REQ because creating"
1970 " a new RDMA channel failed.\n");
1974 ret = srpt_ch_qp_rtr(ch, ch->qp);
1976 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
1977 pr_err("rejected SRP_LOGIN_REQ because enabling"
1978 " RTR failed (error code = %d)\n", ret);
1983 * Use the initator port identifier as the session name, when
1984 * checking against se_node_acl->initiatorname[] this can be
1985 * with or without preceeding '0x'.
1987 snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx",
1988 be64_to_cpu(*(__be64 *)ch->i_port_id),
1989 be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
1991 pr_debug("registering session %s\n", ch->sess_name);
1992 p = &ch->sess_name[0];
1995 ch->sess = target_alloc_session(&sport->port_tpg_1, 0, 0,
1996 TARGET_PROT_NORMAL, p, ch, NULL);
1997 if (IS_ERR(ch->sess)) {
1998 pr_info("Rejected login because no ACL has been"
1999 " configured yet for initiator %s.\n", p);
2001 * XXX: Hack to retry of ch->i_port_id without leading '0x'
2003 if (p == &ch->sess_name[0]) {
2007 rej->reason = cpu_to_be32((PTR_ERR(ch->sess) == -ENOMEM) ?
2008 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES :
2009 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2013 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess,
2014 ch->sess_name, ch->cm_id);
2016 /* create srp_login_response */
2017 rsp->opcode = SRP_LOGIN_RSP;
2018 rsp->tag = req->tag;
2019 rsp->max_it_iu_len = req->req_it_iu_len;
2020 rsp->max_ti_iu_len = req->req_it_iu_len;
2021 ch->max_ti_iu_len = it_iu_len;
2022 rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2023 | SRP_BUF_FORMAT_INDIRECT);
2024 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2025 atomic_set(&ch->req_lim, ch->rq_size);
2026 atomic_set(&ch->req_lim_delta, 0);
2028 /* create cm reply */
2029 rep_param->qp_num = ch->qp->qp_num;
2030 rep_param->private_data = (void *)rsp;
2031 rep_param->private_data_len = sizeof(*rsp);
2032 rep_param->rnr_retry_count = 7;
2033 rep_param->flow_control = 1;
2034 rep_param->failover_accepted = 0;
2036 rep_param->responder_resources = 4;
2037 rep_param->initiator_depth = 4;
2039 ret = ib_send_cm_rep(cm_id, rep_param);
2041 pr_err("sending SRP_LOGIN_REQ response failed"
2042 " (error code = %d)\n", ret);
2043 goto release_channel;
2046 mutex_lock(&sdev->mutex);
2047 list_add_tail(&ch->list, &sdev->rch_list);
2048 mutex_unlock(&sdev->mutex);
2053 srpt_disconnect_ch(ch);
2054 transport_deregister_session_configfs(ch->sess);
2055 transport_deregister_session(ch->sess);
2059 srpt_destroy_ch_ib(ch);
2062 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2063 ch->sport->sdev, ch->rq_size,
2064 ch->rsp_size, DMA_TO_DEVICE);
2069 rej->opcode = SRP_LOGIN_REJ;
2070 rej->tag = req->tag;
2071 rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2072 | SRP_BUF_FORMAT_INDIRECT);
2074 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2075 (void *)rej, sizeof(*rej));
2085 static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,
2086 enum ib_cm_rej_reason reason,
2087 const u8 *private_data,
2088 u8 private_data_len)
2093 if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,
2095 for (i = 0; i < private_data_len; i++)
2096 sprintf(priv + 3 * i, " %02x", private_data[i]);
2098 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2099 ch->sess_name, ch->qp->qp_num, reason, private_data_len ?
2100 "; private data" : "", priv ? priv : " (?)");
2105 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2107 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2108 * and that the recipient may begin transmitting (RTU = ready to use).
2110 static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
2114 if (srpt_set_ch_state(ch, CH_LIVE)) {
2115 ret = srpt_ch_qp_rts(ch, ch->qp);
2118 /* Trigger wait list processing. */
2119 ret = srpt_zerolength_write(ch);
2120 WARN_ONCE(ret < 0, "%d\n", ret);
2128 * srpt_cm_handler() - IB connection manager callback function.
2130 * A non-zero return value will cause the caller destroy the CM ID.
2132 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2133 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2134 * a non-zero value in any other case will trigger a race with the
2135 * ib_destroy_cm_id() call in srpt_release_channel().
2137 static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2139 struct srpt_rdma_ch *ch = cm_id->context;
2143 switch (event->event) {
2144 case IB_CM_REQ_RECEIVED:
2145 ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
2146 event->private_data);
2148 case IB_CM_REJ_RECEIVED:
2149 srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,
2150 event->private_data,
2151 IB_CM_REJ_PRIVATE_DATA_SIZE);
2153 case IB_CM_RTU_RECEIVED:
2154 case IB_CM_USER_ESTABLISHED:
2155 srpt_cm_rtu_recv(ch);
2157 case IB_CM_DREQ_RECEIVED:
2158 srpt_disconnect_ch(ch);
2160 case IB_CM_DREP_RECEIVED:
2161 pr_info("Received CM DREP message for ch %s-%d.\n",
2162 ch->sess_name, ch->qp->qp_num);
2165 case IB_CM_TIMEWAIT_EXIT:
2166 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2167 ch->sess_name, ch->qp->qp_num);
2170 case IB_CM_REP_ERROR:
2171 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
2174 case IB_CM_DREQ_ERROR:
2175 pr_info("Received CM DREQ ERROR event.\n");
2177 case IB_CM_MRA_RECEIVED:
2178 pr_info("Received CM MRA event\n");
2181 pr_err("received unrecognized CM event %d\n", event->event);
2188 static int srpt_write_pending_status(struct se_cmd *se_cmd)
2190 struct srpt_send_ioctx *ioctx;
2192 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2193 return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA;
2197 * srpt_write_pending() - Start data transfer from initiator to target (write).
2199 static int srpt_write_pending(struct se_cmd *se_cmd)
2201 struct srpt_send_ioctx *ioctx =
2202 container_of(se_cmd, struct srpt_send_ioctx, cmd);
2203 struct srpt_rdma_ch *ch = ioctx->ch;
2204 struct ib_send_wr *first_wr = NULL, *bad_wr;
2205 struct ib_cqe *cqe = &ioctx->rdma_cqe;
2206 enum srpt_command_state new_state;
2209 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2210 WARN_ON(new_state == SRPT_STATE_DONE);
2212 if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) {
2213 pr_warn("%s: IB send queue full (needed %d)\n",
2214 __func__, ioctx->n_rdma);
2219 cqe->done = srpt_rdma_read_done;
2220 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2221 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2223 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port,
2228 ret = ib_post_send(ch->qp, first_wr, &bad_wr);
2230 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
2231 __func__, ret, ioctx->n_rdma,
2232 atomic_read(&ch->sq_wr_avail));
2238 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
2242 static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2244 switch (tcm_mgmt_status) {
2245 case TMR_FUNCTION_COMPLETE:
2246 return SRP_TSK_MGMT_SUCCESS;
2247 case TMR_FUNCTION_REJECTED:
2248 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
2250 return SRP_TSK_MGMT_FAILED;
2254 * srpt_queue_response() - Transmits the response to a SCSI command.
2256 * Callback function called by the TCM core. Must not block since it can be
2257 * invoked on the context of the IB completion handler.
2259 static void srpt_queue_response(struct se_cmd *cmd)
2261 struct srpt_send_ioctx *ioctx =
2262 container_of(cmd, struct srpt_send_ioctx, cmd);
2263 struct srpt_rdma_ch *ch = ioctx->ch;
2264 struct srpt_device *sdev = ch->sport->sdev;
2265 struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr;
2267 enum srpt_command_state state;
2268 unsigned long flags;
2269 int resp_len, ret, i;
2274 spin_lock_irqsave(&ioctx->spinlock, flags);
2275 state = ioctx->state;
2277 case SRPT_STATE_NEW:
2278 case SRPT_STATE_DATA_IN:
2279 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
2281 case SRPT_STATE_MGMT:
2282 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
2285 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2286 ch, ioctx->ioctx.index, ioctx->state);
2289 spin_unlock_irqrestore(&ioctx->spinlock, flags);
2291 if (unlikely(transport_check_aborted_status(&ioctx->cmd, false)
2292 || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) {
2293 atomic_inc(&ch->req_lim_delta);
2294 srpt_abort_cmd(ioctx);
2298 /* For read commands, transfer the data to the initiator. */
2299 if (ioctx->cmd.data_direction == DMA_FROM_DEVICE &&
2300 ioctx->cmd.data_length &&
2301 !ioctx->queue_status_only) {
2302 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2303 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2305 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,
2306 ch->sport->port, NULL, first_wr);
2310 if (state != SRPT_STATE_MGMT)
2311 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
2315 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
2316 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
2320 atomic_inc(&ch->req_lim);
2322 if (unlikely(atomic_sub_return(1 + ioctx->n_rdma,
2323 &ch->sq_wr_avail) < 0)) {
2324 pr_warn("%s: IB send queue full (needed %d)\n",
2325 __func__, ioctx->n_rdma);
2330 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len,
2333 sge.addr = ioctx->ioctx.dma;
2334 sge.length = resp_len;
2335 sge.lkey = sdev->pd->local_dma_lkey;
2337 ioctx->ioctx.cqe.done = srpt_send_done;
2338 send_wr.next = NULL;
2339 send_wr.wr_cqe = &ioctx->ioctx.cqe;
2340 send_wr.sg_list = &sge;
2341 send_wr.num_sge = 1;
2342 send_wr.opcode = IB_WR_SEND;
2343 send_wr.send_flags = IB_SEND_SIGNALED;
2345 ret = ib_post_send(ch->qp, first_wr, &bad_wr);
2347 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
2348 __func__, ioctx->cmd.tag, ret);
2355 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
2356 atomic_dec(&ch->req_lim);
2357 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
2358 target_put_sess_cmd(&ioctx->cmd);
2361 static int srpt_queue_data_in(struct se_cmd *cmd)
2363 srpt_queue_response(cmd);
2367 static void srpt_queue_tm_rsp(struct se_cmd *cmd)
2369 srpt_queue_response(cmd);
2372 static void srpt_aborted_task(struct se_cmd *cmd)
2376 static int srpt_queue_status(struct se_cmd *cmd)
2378 struct srpt_send_ioctx *ioctx;
2380 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
2381 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
2382 if (cmd->se_cmd_flags &
2383 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
2384 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
2385 ioctx->queue_status_only = true;
2386 srpt_queue_response(cmd);
2390 static void srpt_refresh_port_work(struct work_struct *work)
2392 struct srpt_port *sport = container_of(work, struct srpt_port, work);
2394 srpt_refresh_port(sport);
2398 * srpt_release_sdev() - Free the channel resources associated with a target.
2400 static int srpt_release_sdev(struct srpt_device *sdev)
2404 WARN_ON_ONCE(irqs_disabled());
2408 mutex_lock(&sdev->mutex);
2409 for (i = 0; i < ARRAY_SIZE(sdev->port); i++)
2410 sdev->port[i].enabled = false;
2411 __srpt_close_all_ch(sdev);
2412 mutex_unlock(&sdev->mutex);
2414 res = wait_event_interruptible(sdev->ch_releaseQ,
2415 list_empty_careful(&sdev->rch_list));
2417 pr_err("%s: interrupted.\n", __func__);
2422 static struct srpt_port *__srpt_lookup_port(const char *name)
2424 struct ib_device *dev;
2425 struct srpt_device *sdev;
2426 struct srpt_port *sport;
2429 list_for_each_entry(sdev, &srpt_dev_list, list) {
2434 for (i = 0; i < dev->phys_port_cnt; i++) {
2435 sport = &sdev->port[i];
2437 if (!strcmp(sport->port_guid, name))
2445 static struct srpt_port *srpt_lookup_port(const char *name)
2447 struct srpt_port *sport;
2449 spin_lock(&srpt_dev_lock);
2450 sport = __srpt_lookup_port(name);
2451 spin_unlock(&srpt_dev_lock);
2457 * srpt_add_one() - Infiniband device addition callback function.
2459 static void srpt_add_one(struct ib_device *device)
2461 struct srpt_device *sdev;
2462 struct srpt_port *sport;
2463 struct ib_srq_init_attr srq_attr;
2466 pr_debug("device = %p, device->dma_ops = %p\n", device,
2469 sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
2473 sdev->device = device;
2474 INIT_LIST_HEAD(&sdev->rch_list);
2475 init_waitqueue_head(&sdev->ch_releaseQ);
2476 mutex_init(&sdev->mutex);
2478 sdev->pd = ib_alloc_pd(device);
2479 if (IS_ERR(sdev->pd))
2482 sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
2484 srq_attr.event_handler = srpt_srq_event;
2485 srq_attr.srq_context = (void *)sdev;
2486 srq_attr.attr.max_wr = sdev->srq_size;
2487 srq_attr.attr.max_sge = 1;
2488 srq_attr.attr.srq_limit = 0;
2489 srq_attr.srq_type = IB_SRQT_BASIC;
2491 sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
2492 if (IS_ERR(sdev->srq))
2495 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
2496 __func__, sdev->srq_size, sdev->device->attrs.max_srq_wr,
2499 if (!srpt_service_guid)
2500 srpt_service_guid = be64_to_cpu(device->node_guid);
2502 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
2503 if (IS_ERR(sdev->cm_id))
2506 /* print out target login information */
2507 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
2508 "pkey=ffff,service_id=%016llx\n", srpt_service_guid,
2509 srpt_service_guid, srpt_service_guid);
2512 * We do not have a consistent service_id (ie. also id_ext of target_id)
2513 * to identify this target. We currently use the guid of the first HCA
2514 * in the system as service_id; therefore, the target_id will change
2515 * if this HCA is gone bad and replaced by different HCA
2517 if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0))
2520 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
2521 srpt_event_handler);
2522 if (ib_register_event_handler(&sdev->event_handler))
2525 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
2526 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
2527 sizeof(*sdev->ioctx_ring[0]),
2528 srp_max_req_size, DMA_FROM_DEVICE);
2529 if (!sdev->ioctx_ring)
2532 for (i = 0; i < sdev->srq_size; ++i)
2533 srpt_post_recv(sdev, sdev->ioctx_ring[i]);
2535 WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
2537 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
2538 sport = &sdev->port[i - 1];
2541 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
2542 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
2543 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
2544 INIT_WORK(&sport->work, srpt_refresh_port_work);
2546 if (srpt_refresh_port(sport)) {
2547 pr_err("MAD registration failed for %s-%d.\n",
2548 sdev->device->name, i);
2551 snprintf(sport->port_guid, sizeof(sport->port_guid),
2553 be64_to_cpu(sport->gid.global.subnet_prefix),
2554 be64_to_cpu(sport->gid.global.interface_id));
2557 spin_lock(&srpt_dev_lock);
2558 list_add_tail(&sdev->list, &srpt_dev_list);
2559 spin_unlock(&srpt_dev_lock);
2562 ib_set_client_data(device, &srpt_client, sdev);
2563 pr_debug("added %s.\n", device->name);
2567 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
2568 sdev->srq_size, srp_max_req_size,
2571 ib_unregister_event_handler(&sdev->event_handler);
2573 ib_destroy_cm_id(sdev->cm_id);
2575 ib_destroy_srq(sdev->srq);
2577 ib_dealloc_pd(sdev->pd);
2582 pr_info("%s(%s) failed.\n", __func__, device->name);
2587 * srpt_remove_one() - InfiniBand device removal callback function.
2589 static void srpt_remove_one(struct ib_device *device, void *client_data)
2591 struct srpt_device *sdev = client_data;
2595 pr_info("%s(%s): nothing to do.\n", __func__, device->name);
2599 srpt_unregister_mad_agent(sdev);
2601 ib_unregister_event_handler(&sdev->event_handler);
2603 /* Cancel any work queued by the just unregistered IB event handler. */
2604 for (i = 0; i < sdev->device->phys_port_cnt; i++)
2605 cancel_work_sync(&sdev->port[i].work);
2607 ib_destroy_cm_id(sdev->cm_id);
2610 * Unregistering a target must happen after destroying sdev->cm_id
2611 * such that no new SRP_LOGIN_REQ information units can arrive while
2612 * destroying the target.
2614 spin_lock(&srpt_dev_lock);
2615 list_del(&sdev->list);
2616 spin_unlock(&srpt_dev_lock);
2617 srpt_release_sdev(sdev);
2619 ib_destroy_srq(sdev->srq);
2620 ib_dealloc_pd(sdev->pd);
2622 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
2623 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
2624 sdev->ioctx_ring = NULL;
2628 static struct ib_client srpt_client = {
2630 .add = srpt_add_one,
2631 .remove = srpt_remove_one
2634 static int srpt_check_true(struct se_portal_group *se_tpg)
2639 static int srpt_check_false(struct se_portal_group *se_tpg)
2644 static char *srpt_get_fabric_name(void)
2649 static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
2651 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
2653 return sport->port_guid;
2656 static u16 srpt_get_tag(struct se_portal_group *tpg)
2661 static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
2666 static void srpt_release_cmd(struct se_cmd *se_cmd)
2668 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
2669 struct srpt_send_ioctx, cmd);
2670 struct srpt_rdma_ch *ch = ioctx->ch;
2671 unsigned long flags;
2673 WARN_ON(ioctx->state != SRPT_STATE_DONE);
2675 if (ioctx->n_rw_ctx) {
2676 srpt_free_rw_ctxs(ch, ioctx);
2677 ioctx->n_rw_ctx = 0;
2680 spin_lock_irqsave(&ch->spinlock, flags);
2681 list_add(&ioctx->free_list, &ch->free_list);
2682 spin_unlock_irqrestore(&ch->spinlock, flags);
2686 * srpt_close_session() - Forcibly close a session.
2688 * Callback function invoked by the TCM core to clean up sessions associated
2689 * with a node ACL when the user invokes
2690 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2692 static void srpt_close_session(struct se_session *se_sess)
2694 DECLARE_COMPLETION_ONSTACK(release_done);
2695 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
2696 struct srpt_device *sdev = ch->sport->sdev;
2699 pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
2702 mutex_lock(&sdev->mutex);
2703 BUG_ON(ch->release_done);
2704 ch->release_done = &release_done;
2705 wait = !list_empty(&ch->list);
2706 srpt_disconnect_ch(ch);
2707 mutex_unlock(&sdev->mutex);
2712 while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0)
2713 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
2714 ch->sess_name, ch->qp->qp_num, ch->state);
2718 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
2720 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
2721 * This object represents an arbitrary integer used to uniquely identify a
2722 * particular attached remote initiator port to a particular SCSI target port
2723 * within a particular SCSI target device within a particular SCSI instance.
2725 static u32 srpt_sess_get_index(struct se_session *se_sess)
2730 static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
2734 /* Note: only used from inside debug printk's by the TCM core. */
2735 static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
2737 struct srpt_send_ioctx *ioctx;
2739 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2740 return srpt_get_cmd_state(ioctx);
2744 * srpt_parse_i_port_id() - Parse an initiator port ID.
2745 * @name: ASCII representation of a 128-bit initiator port ID.
2746 * @i_port_id: Binary 128-bit port ID.
2748 static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
2751 unsigned len, count, leading_zero_bytes;
2755 if (strncasecmp(p, "0x", 2) == 0)
2761 count = min(len / 2, 16U);
2762 leading_zero_bytes = 16 - count;
2763 memset(i_port_id, 0, leading_zero_bytes);
2764 rc = hex2bin(i_port_id + leading_zero_bytes, p, count);
2766 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc);
2773 * configfs callback function invoked for
2774 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2776 static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
2780 if (srpt_parse_i_port_id(i_port_id, name) < 0) {
2781 pr_err("invalid initiator port ID %s\n", name);
2787 static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,
2790 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2791 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2793 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
2796 static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,
2797 const char *page, size_t count)
2799 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2800 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2804 ret = kstrtoul(page, 0, &val);
2806 pr_err("kstrtoul() failed with ret: %d\n", ret);
2809 if (val > MAX_SRPT_RDMA_SIZE) {
2810 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
2811 MAX_SRPT_RDMA_SIZE);
2814 if (val < DEFAULT_MAX_RDMA_SIZE) {
2815 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
2816 val, DEFAULT_MAX_RDMA_SIZE);
2819 sport->port_attrib.srp_max_rdma_size = val;
2824 static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,
2827 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2828 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2830 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
2833 static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,
2834 const char *page, size_t count)
2836 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2837 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2841 ret = kstrtoul(page, 0, &val);
2843 pr_err("kstrtoul() failed with ret: %d\n", ret);
2846 if (val > MAX_SRPT_RSP_SIZE) {
2847 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
2851 if (val < MIN_MAX_RSP_SIZE) {
2852 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
2856 sport->port_attrib.srp_max_rsp_size = val;
2861 static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,
2864 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2865 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2867 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
2870 static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,
2871 const char *page, size_t count)
2873 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2874 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2878 ret = kstrtoul(page, 0, &val);
2880 pr_err("kstrtoul() failed with ret: %d\n", ret);
2883 if (val > MAX_SRPT_SRQ_SIZE) {
2884 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
2888 if (val < MIN_SRPT_SRQ_SIZE) {
2889 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
2893 sport->port_attrib.srp_sq_size = val;
2898 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);
2899 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);
2900 CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);
2902 static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
2903 &srpt_tpg_attrib_attr_srp_max_rdma_size,
2904 &srpt_tpg_attrib_attr_srp_max_rsp_size,
2905 &srpt_tpg_attrib_attr_srp_sq_size,
2909 static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page)
2911 struct se_portal_group *se_tpg = to_tpg(item);
2912 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2914 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
2917 static ssize_t srpt_tpg_enable_store(struct config_item *item,
2918 const char *page, size_t count)
2920 struct se_portal_group *se_tpg = to_tpg(item);
2921 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
2922 struct srpt_device *sdev = sport->sdev;
2923 struct srpt_rdma_ch *ch;
2927 ret = kstrtoul(page, 0, &tmp);
2929 pr_err("Unable to extract srpt_tpg_store_enable\n");
2933 if ((tmp != 0) && (tmp != 1)) {
2934 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
2937 if (sport->enabled == tmp)
2939 sport->enabled = tmp;
2943 mutex_lock(&sdev->mutex);
2944 list_for_each_entry(ch, &sdev->rch_list, list) {
2945 if (ch->sport == sport) {
2946 pr_debug("%s: ch %p %s-%d\n", __func__, ch,
2947 ch->sess_name, ch->qp->qp_num);
2948 srpt_disconnect_ch(ch);
2952 mutex_unlock(&sdev->mutex);
2958 CONFIGFS_ATTR(srpt_tpg_, enable);
2960 static struct configfs_attribute *srpt_tpg_attrs[] = {
2961 &srpt_tpg_attr_enable,
2966 * configfs callback invoked for
2967 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
2969 static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
2970 struct config_group *group,
2973 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
2976 /* Initialize sport->port_wwn and sport->port_tpg_1 */
2977 res = core_tpg_register(&sport->port_wwn, &sport->port_tpg_1, SCSI_PROTOCOL_SRP);
2979 return ERR_PTR(res);
2981 return &sport->port_tpg_1;
2985 * configfs callback invoked for
2986 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
2988 static void srpt_drop_tpg(struct se_portal_group *tpg)
2990 struct srpt_port *sport = container_of(tpg,
2991 struct srpt_port, port_tpg_1);
2993 sport->enabled = false;
2994 core_tpg_deregister(&sport->port_tpg_1);
2998 * configfs callback invoked for
2999 * mkdir /sys/kernel/config/target/$driver/$port
3001 static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3002 struct config_group *group,
3005 struct srpt_port *sport;
3008 sport = srpt_lookup_port(name);
3009 pr_debug("make_tport(%s)\n", name);
3014 return &sport->port_wwn;
3017 return ERR_PTR(ret);
3021 * configfs callback invoked for
3022 * rmdir /sys/kernel/config/target/$driver/$port
3024 static void srpt_drop_tport(struct se_wwn *wwn)
3026 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3028 pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item));
3031 static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)
3033 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3036 CONFIGFS_ATTR_RO(srpt_wwn_, version);
3038 static struct configfs_attribute *srpt_wwn_attrs[] = {
3039 &srpt_wwn_attr_version,
3043 static const struct target_core_fabric_ops srpt_template = {
3044 .module = THIS_MODULE,
3046 .get_fabric_name = srpt_get_fabric_name,
3047 .tpg_get_wwn = srpt_get_fabric_wwn,
3048 .tpg_get_tag = srpt_get_tag,
3049 .tpg_check_demo_mode = srpt_check_false,
3050 .tpg_check_demo_mode_cache = srpt_check_true,
3051 .tpg_check_demo_mode_write_protect = srpt_check_true,
3052 .tpg_check_prod_mode_write_protect = srpt_check_false,
3053 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3054 .release_cmd = srpt_release_cmd,
3055 .check_stop_free = srpt_check_stop_free,
3056 .close_session = srpt_close_session,
3057 .sess_get_index = srpt_sess_get_index,
3058 .sess_get_initiator_sid = NULL,
3059 .write_pending = srpt_write_pending,
3060 .write_pending_status = srpt_write_pending_status,
3061 .set_default_node_attributes = srpt_set_default_node_attrs,
3062 .get_cmd_state = srpt_get_tcm_cmd_state,
3063 .queue_data_in = srpt_queue_data_in,
3064 .queue_status = srpt_queue_status,
3065 .queue_tm_rsp = srpt_queue_tm_rsp,
3066 .aborted_task = srpt_aborted_task,
3068 * Setup function pointers for generic logic in
3069 * target_core_fabric_configfs.c
3071 .fabric_make_wwn = srpt_make_tport,
3072 .fabric_drop_wwn = srpt_drop_tport,
3073 .fabric_make_tpg = srpt_make_tpg,
3074 .fabric_drop_tpg = srpt_drop_tpg,
3075 .fabric_init_nodeacl = srpt_init_nodeacl,
3077 .tfc_wwn_attrs = srpt_wwn_attrs,
3078 .tfc_tpg_base_attrs = srpt_tpg_attrs,
3079 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
3083 * srpt_init_module() - Kernel module initialization.
3085 * Note: Since ib_register_client() registers callback functions, and since at
3086 * least one of these callback functions (srpt_add_one()) calls target core
3087 * functions, this driver must be registered with the target core before
3088 * ib_register_client() is called.
3090 static int __init srpt_init_module(void)
3095 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
3096 pr_err("invalid value %d for kernel module parameter"
3097 " srp_max_req_size -- must be at least %d.\n",
3098 srp_max_req_size, MIN_MAX_REQ_SIZE);
3102 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3103 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
3104 pr_err("invalid value %d for kernel module parameter"
3105 " srpt_srq_size -- must be in the range [%d..%d].\n",
3106 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3110 ret = target_register_template(&srpt_template);
3114 ret = ib_register_client(&srpt_client);
3116 pr_err("couldn't register IB client\n");
3117 goto out_unregister_target;
3122 out_unregister_target:
3123 target_unregister_template(&srpt_template);
3128 static void __exit srpt_cleanup_module(void)
3130 ib_unregister_client(&srpt_client);
3131 target_unregister_template(&srpt_template);
3134 module_init(srpt_init_module);
3135 module_exit(srpt_cleanup_module);