1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
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 <linux/inet.h>
45#include <rdma/ib_cache.h>
46#include <scsi/scsi_proto.h>
47#include <scsi/scsi_tcq.h>
48#include <target/target_core_base.h>
49#include <target/target_core_fabric.h>
50#include "ib_srpt.h"
51
52
53#define DRV_NAME "ib_srpt"
54#define DRV_VERSION "2.0.0"
55#define DRV_RELDATE "2011-02-14"
56
57#define SRPT_ID_STRING "Linux SRP target"
58
59#undef pr_fmt
60#define pr_fmt(fmt) DRV_NAME " " fmt
61
62MODULE_AUTHOR("Vu Pham and Bart Van Assche");
63MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
64 "v" DRV_VERSION " (" DRV_RELDATE ")");
65MODULE_LICENSE("Dual BSD/GPL");
66
67
68
69
70
71static u64 srpt_service_guid;
72static DEFINE_SPINLOCK(srpt_dev_lock);
73static LIST_HEAD(srpt_dev_list);
74
75static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
76module_param(srp_max_req_size, int, 0444);
77MODULE_PARM_DESC(srp_max_req_size,
78 "Maximum size of SRP request messages in bytes.");
79
80static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
81module_param(srpt_srq_size, int, 0444);
82MODULE_PARM_DESC(srpt_srq_size,
83 "Shared receive queue (SRQ) size.");
84
85static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp)
86{
87 return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
88}
89module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
90 0444);
91MODULE_PARM_DESC(srpt_service_guid,
92 "Using this value for ioc_guid, id_ext, and cm_listen_id"
93 " instead of using the node_guid of the first HCA.");
94
95static struct ib_client srpt_client;
96
97static DEFINE_MUTEX(rdma_cm_mutex);
98
99static u16 rdma_cm_port;
100static struct rdma_cm_id *rdma_cm_id;
101static void srpt_release_cmd(struct se_cmd *se_cmd);
102static void srpt_free_ch(struct kref *kref);
103static int srpt_queue_status(struct se_cmd *cmd);
104static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
105static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
106static void srpt_process_wait_list(struct srpt_rdma_ch *ch);
107
108
109
110
111
112static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new)
113{
114 unsigned long flags;
115 enum rdma_ch_state prev;
116 bool changed = false;
117
118 spin_lock_irqsave(&ch->spinlock, flags);
119 prev = ch->state;
120 if (new > prev) {
121 ch->state = new;
122 changed = true;
123 }
124 spin_unlock_irqrestore(&ch->spinlock, flags);
125
126 return changed;
127}
128
129
130
131
132
133
134
135
136
137
138
139static void srpt_event_handler(struct ib_event_handler *handler,
140 struct ib_event *event)
141{
142 struct srpt_device *sdev;
143 struct srpt_port *sport;
144 u8 port_num;
145
146 sdev = ib_get_client_data(event->device, &srpt_client);
147 if (!sdev || sdev->device != event->device)
148 return;
149
150 pr_debug("ASYNC event= %d on device= %s\n", event->event,
151 sdev->device->name);
152
153 switch (event->event) {
154 case IB_EVENT_PORT_ERR:
155 port_num = event->element.port_num - 1;
156 if (port_num < sdev->device->phys_port_cnt) {
157 sport = &sdev->port[port_num];
158 sport->lid = 0;
159 sport->sm_lid = 0;
160 } else {
161 WARN(true, "event %d: port_num %d out of range 1..%d\n",
162 event->event, port_num + 1,
163 sdev->device->phys_port_cnt);
164 }
165 break;
166 case IB_EVENT_PORT_ACTIVE:
167 case IB_EVENT_LID_CHANGE:
168 case IB_EVENT_PKEY_CHANGE:
169 case IB_EVENT_SM_CHANGE:
170 case IB_EVENT_CLIENT_REREGISTER:
171 case IB_EVENT_GID_CHANGE:
172
173 port_num = event->element.port_num - 1;
174 if (port_num < sdev->device->phys_port_cnt) {
175 sport = &sdev->port[port_num];
176 if (!sport->lid && !sport->sm_lid)
177 schedule_work(&sport->work);
178 } else {
179 WARN(true, "event %d: port_num %d out of range 1..%d\n",
180 event->event, port_num + 1,
181 sdev->device->phys_port_cnt);
182 }
183 break;
184 default:
185 pr_err("received unrecognized IB event %d\n", event->event);
186 break;
187 }
188}
189
190
191
192
193
194
195static void srpt_srq_event(struct ib_event *event, void *ctx)
196{
197 pr_debug("SRQ event %d\n", event->event);
198}
199
200static const char *get_ch_state_name(enum rdma_ch_state s)
201{
202 switch (s) {
203 case CH_CONNECTING:
204 return "connecting";
205 case CH_LIVE:
206 return "live";
207 case CH_DISCONNECTING:
208 return "disconnecting";
209 case CH_DRAINING:
210 return "draining";
211 case CH_DISCONNECTED:
212 return "disconnected";
213 }
214 return "???";
215}
216
217
218
219
220
221
222static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
223{
224 pr_debug("QP event %d on ch=%p sess_name=%s state=%d\n",
225 event->event, ch, ch->sess_name, ch->state);
226
227 switch (event->event) {
228 case IB_EVENT_COMM_EST:
229 if (ch->using_rdma_cm)
230 rdma_notify(ch->rdma_cm.cm_id, event->event);
231 else
232 ib_cm_notify(ch->ib_cm.cm_id, event->event);
233 break;
234 case IB_EVENT_QP_LAST_WQE_REACHED:
235 pr_debug("%s-%d, state %s: received Last WQE event.\n",
236 ch->sess_name, ch->qp->qp_num,
237 get_ch_state_name(ch->state));
238 break;
239 default:
240 pr_err("received unrecognized IB QP event %d\n", event->event);
241 break;
242 }
243}
244
245
246
247
248
249
250
251
252
253
254static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
255{
256 u16 id;
257 u8 tmp;
258
259 id = (slot - 1) / 2;
260 if (slot & 0x1) {
261 tmp = c_list[id] & 0xf;
262 c_list[id] = (value << 4) | tmp;
263 } else {
264 tmp = c_list[id] & 0xf0;
265 c_list[id] = (value & 0xf) | tmp;
266 }
267}
268
269
270
271
272
273
274
275
276static void srpt_get_class_port_info(struct ib_dm_mad *mad)
277{
278 struct ib_class_port_info *cif;
279
280 cif = (struct ib_class_port_info *)mad->data;
281 memset(cif, 0, sizeof(*cif));
282 cif->base_version = 1;
283 cif->class_version = 1;
284
285 ib_set_cpi_resp_time(cif, 20);
286 mad->mad_hdr.status = 0;
287}
288
289
290
291
292
293
294
295
296static void srpt_get_iou(struct ib_dm_mad *mad)
297{
298 struct ib_dm_iou_info *ioui;
299 u8 slot;
300 int i;
301
302 ioui = (struct ib_dm_iou_info *)mad->data;
303 ioui->change_id = cpu_to_be16(1);
304 ioui->max_controllers = 16;
305
306
307 srpt_set_ioc(ioui->controller_list, 1, 1);
308 for (i = 1, slot = 2; i < 16; i++, slot++)
309 srpt_set_ioc(ioui->controller_list, slot, 0);
310
311 mad->mad_hdr.status = 0;
312}
313
314
315
316
317
318
319
320
321
322
323
324static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
325 struct ib_dm_mad *mad)
326{
327 struct srpt_device *sdev = sport->sdev;
328 struct ib_dm_ioc_profile *iocp;
329 int send_queue_depth;
330
331 iocp = (struct ib_dm_ioc_profile *)mad->data;
332
333 if (!slot || slot > 16) {
334 mad->mad_hdr.status
335 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
336 return;
337 }
338
339 if (slot > 2) {
340 mad->mad_hdr.status
341 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
342 return;
343 }
344
345 if (sdev->use_srq)
346 send_queue_depth = sdev->srq_size;
347 else
348 send_queue_depth = min(MAX_SRPT_RQ_SIZE,
349 sdev->device->attrs.max_qp_wr);
350
351 memset(iocp, 0, sizeof(*iocp));
352 strcpy(iocp->id_string, SRPT_ID_STRING);
353 iocp->guid = cpu_to_be64(srpt_service_guid);
354 iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
355 iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);
356 iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);
357 iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
358 iocp->subsys_device_id = 0x0;
359 iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
360 iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
361 iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
362 iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
363 iocp->send_queue_depth = cpu_to_be16(send_queue_depth);
364 iocp->rdma_read_depth = 4;
365 iocp->send_size = cpu_to_be32(srp_max_req_size);
366 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
367 1U << 24));
368 iocp->num_svc_entries = 1;
369 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
370 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
371
372 mad->mad_hdr.status = 0;
373}
374
375
376
377
378
379
380
381
382
383
384
385
386static void srpt_get_svc_entries(u64 ioc_guid,
387 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
388{
389 struct ib_dm_svc_entries *svc_entries;
390
391 WARN_ON(!ioc_guid);
392
393 if (!slot || slot > 16) {
394 mad->mad_hdr.status
395 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
396 return;
397 }
398
399 if (slot > 2 || lo > hi || hi > 1) {
400 mad->mad_hdr.status
401 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
402 return;
403 }
404
405 svc_entries = (struct ib_dm_svc_entries *)mad->data;
406 memset(svc_entries, 0, sizeof(*svc_entries));
407 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
408 snprintf(svc_entries->service_entries[0].name,
409 sizeof(svc_entries->service_entries[0].name),
410 "%s%016llx",
411 SRP_SERVICE_NAME_PREFIX,
412 ioc_guid);
413
414 mad->mad_hdr.status = 0;
415}
416
417
418
419
420
421
422
423static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
424 struct ib_dm_mad *rsp_mad)
425{
426 u16 attr_id;
427 u32 slot;
428 u8 hi, lo;
429
430 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
431 switch (attr_id) {
432 case DM_ATTR_CLASS_PORT_INFO:
433 srpt_get_class_port_info(rsp_mad);
434 break;
435 case DM_ATTR_IOU_INFO:
436 srpt_get_iou(rsp_mad);
437 break;
438 case DM_ATTR_IOC_PROFILE:
439 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
440 srpt_get_ioc(sp, slot, rsp_mad);
441 break;
442 case DM_ATTR_SVC_ENTRIES:
443 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
444 hi = (u8) ((slot >> 8) & 0xff);
445 lo = (u8) (slot & 0xff);
446 slot = (u16) ((slot >> 16) & 0xffff);
447 srpt_get_svc_entries(srpt_service_guid,
448 slot, hi, lo, rsp_mad);
449 break;
450 default:
451 rsp_mad->mad_hdr.status =
452 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
453 break;
454 }
455}
456
457
458
459
460
461
462static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
463 struct ib_mad_send_wc *mad_wc)
464{
465 rdma_destroy_ah(mad_wc->send_buf->ah);
466 ib_free_send_mad(mad_wc->send_buf);
467}
468
469
470
471
472
473
474
475static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
476 struct ib_mad_send_buf *send_buf,
477 struct ib_mad_recv_wc *mad_wc)
478{
479 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
480 struct ib_ah *ah;
481 struct ib_mad_send_buf *rsp;
482 struct ib_dm_mad *dm_mad;
483
484 if (!mad_wc || !mad_wc->recv_buf.mad)
485 return;
486
487 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
488 mad_wc->recv_buf.grh, mad_agent->port_num);
489 if (IS_ERR(ah))
490 goto err;
491
492 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
493
494 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
495 mad_wc->wc->pkey_index, 0,
496 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
497 GFP_KERNEL,
498 IB_MGMT_BASE_VERSION);
499 if (IS_ERR(rsp))
500 goto err_rsp;
501
502 rsp->ah = ah;
503
504 dm_mad = rsp->mad;
505 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad));
506 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
507 dm_mad->mad_hdr.status = 0;
508
509 switch (mad_wc->recv_buf.mad->mad_hdr.method) {
510 case IB_MGMT_METHOD_GET:
511 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
512 break;
513 case IB_MGMT_METHOD_SET:
514 dm_mad->mad_hdr.status =
515 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
516 break;
517 default:
518 dm_mad->mad_hdr.status =
519 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
520 break;
521 }
522
523 if (!ib_post_send_mad(rsp, NULL)) {
524 ib_free_recv_mad(mad_wc);
525
526 return;
527 }
528
529 ib_free_send_mad(rsp);
530
531err_rsp:
532 rdma_destroy_ah(ah);
533err:
534 ib_free_recv_mad(mad_wc);
535}
536
537static int srpt_format_guid(char *buf, unsigned int size, const __be64 *guid)
538{
539 const __be16 *g = (const __be16 *)guid;
540
541 return snprintf(buf, size, "%04x:%04x:%04x:%04x",
542 be16_to_cpu(g[0]), be16_to_cpu(g[1]),
543 be16_to_cpu(g[2]), be16_to_cpu(g[3]));
544}
545
546
547
548
549
550
551
552
553
554
555
556static int srpt_refresh_port(struct srpt_port *sport)
557{
558 struct ib_mad_reg_req reg_req;
559 struct ib_port_modify port_modify;
560 struct ib_port_attr port_attr;
561 int ret;
562
563 memset(&port_modify, 0, sizeof(port_modify));
564 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
565 port_modify.clr_port_cap_mask = 0;
566
567 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
568 if (ret)
569 goto err_mod_port;
570
571 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
572 if (ret)
573 goto err_query_port;
574
575 sport->sm_lid = port_attr.sm_lid;
576 sport->lid = port_attr.lid;
577
578 ret = rdma_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
579 if (ret)
580 goto err_query_port;
581
582 sport->port_guid_wwn.priv = sport;
583 srpt_format_guid(sport->port_guid, sizeof(sport->port_guid),
584 &sport->gid.global.interface_id);
585 sport->port_gid_wwn.priv = sport;
586 snprintf(sport->port_gid, sizeof(sport->port_gid),
587 "0x%016llx%016llx",
588 be64_to_cpu(sport->gid.global.subnet_prefix),
589 be64_to_cpu(sport->gid.global.interface_id));
590
591 if (!sport->mad_agent) {
592 memset(®_req, 0, sizeof(reg_req));
593 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
594 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
595 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
596 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
597
598 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
599 sport->port,
600 IB_QPT_GSI,
601 ®_req, 0,
602 srpt_mad_send_handler,
603 srpt_mad_recv_handler,
604 sport, 0);
605 if (IS_ERR(sport->mad_agent)) {
606 ret = PTR_ERR(sport->mad_agent);
607 sport->mad_agent = NULL;
608 goto err_query_port;
609 }
610 }
611
612 return 0;
613
614err_query_port:
615
616 port_modify.set_port_cap_mask = 0;
617 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
618 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
619
620err_mod_port:
621
622 return ret;
623}
624
625
626
627
628
629
630
631static void srpt_unregister_mad_agent(struct srpt_device *sdev)
632{
633 struct ib_port_modify port_modify = {
634 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
635 };
636 struct srpt_port *sport;
637 int i;
638
639 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
640 sport = &sdev->port[i - 1];
641 WARN_ON(sport->port != i);
642 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
643 pr_err("disabling MAD processing failed.\n");
644 if (sport->mad_agent) {
645 ib_unregister_mad_agent(sport->mad_agent);
646 sport->mad_agent = NULL;
647 }
648 }
649}
650
651
652
653
654
655
656
657
658static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
659 int ioctx_size, int dma_size,
660 enum dma_data_direction dir)
661{
662 struct srpt_ioctx *ioctx;
663
664 ioctx = kmalloc(ioctx_size, GFP_KERNEL);
665 if (!ioctx)
666 goto err;
667
668 ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
669 if (!ioctx->buf)
670 goto err_free_ioctx;
671
672 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
673 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
674 goto err_free_buf;
675
676 return ioctx;
677
678err_free_buf:
679 kfree(ioctx->buf);
680err_free_ioctx:
681 kfree(ioctx);
682err:
683 return NULL;
684}
685
686
687
688
689
690
691
692
693static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
694 int dma_size, enum dma_data_direction dir)
695{
696 if (!ioctx)
697 return;
698
699 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
700 kfree(ioctx->buf);
701 kfree(ioctx);
702}
703
704
705
706
707
708
709
710
711
712static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
713 int ring_size, int ioctx_size,
714 int dma_size, enum dma_data_direction dir)
715{
716 struct srpt_ioctx **ring;
717 int i;
718
719 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
720 && ioctx_size != sizeof(struct srpt_send_ioctx));
721
722 ring = kvmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL);
723 if (!ring)
724 goto out;
725 for (i = 0; i < ring_size; ++i) {
726 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
727 if (!ring[i])
728 goto err;
729 ring[i]->index = i;
730 }
731 goto out;
732
733err:
734 while (--i >= 0)
735 srpt_free_ioctx(sdev, ring[i], dma_size, dir);
736 kvfree(ring);
737 ring = NULL;
738out:
739 return ring;
740}
741
742
743
744
745
746
747
748
749
750static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
751 struct srpt_device *sdev, int ring_size,
752 int dma_size, enum dma_data_direction dir)
753{
754 int i;
755
756 if (!ioctx_ring)
757 return;
758
759 for (i = 0; i < ring_size; ++i)
760 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
761 kvfree(ioctx_ring);
762}
763
764
765
766
767
768
769
770
771
772static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
773 enum srpt_command_state new)
774{
775 enum srpt_command_state previous;
776
777 previous = ioctx->state;
778 if (previous != SRPT_STATE_DONE)
779 ioctx->state = new;
780
781 return previous;
782}
783
784
785
786
787
788
789
790
791
792static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
793 enum srpt_command_state old,
794 enum srpt_command_state new)
795{
796 enum srpt_command_state previous;
797
798 WARN_ON(!ioctx);
799 WARN_ON(old == SRPT_STATE_DONE);
800 WARN_ON(new == SRPT_STATE_NEW);
801
802 previous = ioctx->state;
803 if (previous == old)
804 ioctx->state = new;
805
806 return previous == old;
807}
808
809
810
811
812
813
814
815static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,
816 struct srpt_recv_ioctx *ioctx)
817{
818 struct ib_sge list;
819 struct ib_recv_wr wr;
820
821 BUG_ON(!sdev);
822 list.addr = ioctx->ioctx.dma;
823 list.length = srp_max_req_size;
824 list.lkey = sdev->lkey;
825
826 ioctx->ioctx.cqe.done = srpt_recv_done;
827 wr.wr_cqe = &ioctx->ioctx.cqe;
828 wr.next = NULL;
829 wr.sg_list = &list;
830 wr.num_sge = 1;
831
832 if (sdev->use_srq)
833 return ib_post_srq_recv(sdev->srq, &wr, NULL);
834 else
835 return ib_post_recv(ch->qp, &wr, NULL);
836}
837
838
839
840
841
842
843
844
845
846
847static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
848{
849 struct ib_rdma_wr wr = {
850 .wr = {
851 .next = NULL,
852 { .wr_cqe = &ch->zw_cqe, },
853 .opcode = IB_WR_RDMA_WRITE,
854 .send_flags = IB_SEND_SIGNALED,
855 }
856 };
857
858 pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
859 ch->qp->qp_num);
860
861 return ib_post_send(ch->qp, &wr.wr, NULL);
862}
863
864static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
865{
866 struct srpt_rdma_ch *ch = cq->cq_context;
867
868 pr_debug("%s-%d wc->status %d\n", ch->sess_name, ch->qp->qp_num,
869 wc->status);
870
871 if (wc->status == IB_WC_SUCCESS) {
872 srpt_process_wait_list(ch);
873 } else {
874 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
875 schedule_work(&ch->release_work);
876 else
877 pr_debug("%s-%d: already disconnected.\n",
878 ch->sess_name, ch->qp->qp_num);
879 }
880}
881
882static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
883 struct srp_direct_buf *db, int nbufs, struct scatterlist **sg,
884 unsigned *sg_cnt)
885{
886 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
887 struct srpt_rdma_ch *ch = ioctx->ch;
888 struct scatterlist *prev = NULL;
889 unsigned prev_nents;
890 int ret, i;
891
892 if (nbufs == 1) {
893 ioctx->rw_ctxs = &ioctx->s_rw_ctx;
894 } else {
895 ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs),
896 GFP_KERNEL);
897 if (!ioctx->rw_ctxs)
898 return -ENOMEM;
899 }
900
901 for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) {
902 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
903 u64 remote_addr = be64_to_cpu(db->va);
904 u32 size = be32_to_cpu(db->len);
905 u32 rkey = be32_to_cpu(db->key);
906
907 ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false,
908 i < nbufs - 1);
909 if (ret)
910 goto unwind;
911
912 ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port,
913 ctx->sg, ctx->nents, 0, remote_addr, rkey, dir);
914 if (ret < 0) {
915 target_free_sgl(ctx->sg, ctx->nents);
916 goto unwind;
917 }
918
919 ioctx->n_rdma += ret;
920 ioctx->n_rw_ctx++;
921
922 if (prev) {
923 sg_unmark_end(&prev[prev_nents - 1]);
924 sg_chain(prev, prev_nents + 1, ctx->sg);
925 } else {
926 *sg = ctx->sg;
927 }
928
929 prev = ctx->sg;
930 prev_nents = ctx->nents;
931
932 *sg_cnt += ctx->nents;
933 }
934
935 return 0;
936
937unwind:
938 while (--i >= 0) {
939 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
940
941 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
942 ctx->sg, ctx->nents, dir);
943 target_free_sgl(ctx->sg, ctx->nents);
944 }
945 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
946 kfree(ioctx->rw_ctxs);
947 return ret;
948}
949
950static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch,
951 struct srpt_send_ioctx *ioctx)
952{
953 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
954 int i;
955
956 for (i = 0; i < ioctx->n_rw_ctx; i++) {
957 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
958
959 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
960 ctx->sg, ctx->nents, dir);
961 target_free_sgl(ctx->sg, ctx->nents);
962 }
963
964 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
965 kfree(ioctx->rw_ctxs);
966}
967
968static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
969{
970
971
972
973
974
975 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&
976 !__same_type(srp_cmd->add_data[0], (u8)0));
977
978
979
980
981
982
983 return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3);
984}
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
1003 struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
1004 struct scatterlist **sg, unsigned *sg_cnt, u64 *data_len)
1005{
1006 BUG_ON(!dir);
1007 BUG_ON(!data_len);
1008
1009
1010
1011
1012
1013
1014 if (srp_cmd->buf_fmt & 0xf)
1015
1016 *dir = DMA_FROM_DEVICE;
1017 else if (srp_cmd->buf_fmt >> 4)
1018
1019 *dir = DMA_TO_DEVICE;
1020 else
1021 *dir = DMA_NONE;
1022
1023
1024 ioctx->cmd.data_direction = *dir;
1025
1026 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
1027 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
1028 struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd);
1029
1030 *data_len = be32_to_cpu(db->len);
1031 return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt);
1032 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
1033 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
1034 struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd);
1035 int nbufs = be32_to_cpu(idb->table_desc.len) /
1036 sizeof(struct srp_direct_buf);
1037
1038 if (nbufs >
1039 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
1040 pr_err("received unsupported SRP_CMD request"
1041 " type (%u out + %u in != %u / %zu)\n",
1042 srp_cmd->data_out_desc_cnt,
1043 srp_cmd->data_in_desc_cnt,
1044 be32_to_cpu(idb->table_desc.len),
1045 sizeof(struct srp_direct_buf));
1046 return -EINVAL;
1047 }
1048
1049 *data_len = be32_to_cpu(idb->len);
1050 return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs,
1051 sg, sg_cnt);
1052 } else {
1053 *data_len = 0;
1054 return 0;
1055 }
1056}
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1067{
1068 struct ib_qp_attr *attr;
1069 int ret;
1070
1071 WARN_ON_ONCE(ch->using_rdma_cm);
1072
1073 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
1074 if (!attr)
1075 return -ENOMEM;
1076
1077 attr->qp_state = IB_QPS_INIT;
1078 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1079 attr->port_num = ch->sport->port;
1080
1081 ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port,
1082 ch->pkey, &attr->pkey_index);
1083 if (ret < 0)
1084 pr_err("Translating pkey %#x failed (%d) - using index 0\n",
1085 ch->pkey, ret);
1086
1087 ret = ib_modify_qp(qp, attr,
1088 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
1089 IB_QP_PKEY_INDEX);
1090
1091 kfree(attr);
1092 return ret;
1093}
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1107{
1108 struct ib_qp_attr qp_attr;
1109 int attr_mask;
1110 int ret;
1111
1112 WARN_ON_ONCE(ch->using_rdma_cm);
1113
1114 qp_attr.qp_state = IB_QPS_RTR;
1115 ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);
1116 if (ret)
1117 goto out;
1118
1119 qp_attr.max_dest_rd_atomic = 4;
1120
1121 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1122
1123out:
1124 return ret;
1125}
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1139{
1140 struct ib_qp_attr qp_attr;
1141 int attr_mask;
1142 int ret;
1143
1144 qp_attr.qp_state = IB_QPS_RTS;
1145 ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);
1146 if (ret)
1147 goto out;
1148
1149 qp_attr.max_rd_atomic = 4;
1150
1151 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1152
1153out:
1154 return ret;
1155}
1156
1157
1158
1159
1160
1161static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1162{
1163 struct ib_qp_attr qp_attr;
1164
1165 qp_attr.qp_state = IB_QPS_ERR;
1166 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1167}
1168
1169
1170
1171
1172
1173static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1174{
1175 struct srpt_send_ioctx *ioctx;
1176 unsigned long flags;
1177
1178 BUG_ON(!ch);
1179
1180 ioctx = NULL;
1181 spin_lock_irqsave(&ch->spinlock, flags);
1182 if (!list_empty(&ch->free_list)) {
1183 ioctx = list_first_entry(&ch->free_list,
1184 struct srpt_send_ioctx, free_list);
1185 list_del(&ioctx->free_list);
1186 }
1187 spin_unlock_irqrestore(&ch->spinlock, flags);
1188
1189 if (!ioctx)
1190 return ioctx;
1191
1192 BUG_ON(ioctx->ch != ch);
1193 ioctx->state = SRPT_STATE_NEW;
1194 ioctx->n_rdma = 0;
1195 ioctx->n_rw_ctx = 0;
1196 ioctx->queue_status_only = false;
1197
1198
1199
1200
1201 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1202 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1203
1204 return ioctx;
1205}
1206
1207
1208
1209
1210
1211static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1212{
1213 enum srpt_command_state state;
1214
1215 BUG_ON(!ioctx);
1216
1217
1218
1219
1220
1221
1222 state = ioctx->state;
1223 switch (state) {
1224 case SRPT_STATE_NEED_DATA:
1225 ioctx->state = SRPT_STATE_DATA_IN;
1226 break;
1227 case SRPT_STATE_CMD_RSP_SENT:
1228 case SRPT_STATE_MGMT_RSP_SENT:
1229 ioctx->state = SRPT_STATE_DONE;
1230 break;
1231 default:
1232 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1233 __func__, state);
1234 break;
1235 }
1236
1237 pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state,
1238 ioctx->state, ioctx->cmd.tag);
1239
1240 switch (state) {
1241 case SRPT_STATE_NEW:
1242 case SRPT_STATE_DATA_IN:
1243 case SRPT_STATE_MGMT:
1244 case SRPT_STATE_DONE:
1245
1246
1247
1248
1249 break;
1250 case SRPT_STATE_NEED_DATA:
1251 pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);
1252 transport_generic_request_failure(&ioctx->cmd,
1253 TCM_CHECK_CONDITION_ABORT_CMD);
1254 break;
1255 case SRPT_STATE_CMD_RSP_SENT:
1256
1257
1258
1259
1260 transport_generic_free_cmd(&ioctx->cmd, 0);
1261 break;
1262 case SRPT_STATE_MGMT_RSP_SENT:
1263 transport_generic_free_cmd(&ioctx->cmd, 0);
1264 break;
1265 default:
1266 WARN(1, "Unexpected command state (%d)", state);
1267 break;
1268 }
1269
1270 return state;
1271}
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1284{
1285 struct srpt_rdma_ch *ch = cq->cq_context;
1286 struct srpt_send_ioctx *ioctx =
1287 container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
1288
1289 WARN_ON(ioctx->n_rdma <= 0);
1290 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1291 ioctx->n_rdma = 0;
1292
1293 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1294 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1295 ioctx, wc->status);
1296 srpt_abort_cmd(ioctx);
1297 return;
1298 }
1299
1300 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1301 SRPT_STATE_DATA_IN))
1302 target_execute_cmd(&ioctx->cmd);
1303 else
1304 pr_err("%s[%d]: wrong state = %d\n", __func__,
1305 __LINE__, ioctx->state);
1306}
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1324 struct srpt_send_ioctx *ioctx, u64 tag,
1325 int status)
1326{
1327 struct srp_rsp *srp_rsp;
1328 const u8 *sense_data;
1329 int sense_data_len, max_sense_len;
1330
1331
1332
1333
1334
1335 WARN_ON(status & 1);
1336
1337 srp_rsp = ioctx->ioctx.buf;
1338 BUG_ON(!srp_rsp);
1339
1340 sense_data = ioctx->sense_data;
1341 sense_data_len = ioctx->cmd.scsi_sense_length;
1342 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1343
1344 memset(srp_rsp, 0, sizeof(*srp_rsp));
1345 srp_rsp->opcode = SRP_RSP;
1346 srp_rsp->req_lim_delta =
1347 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1348 srp_rsp->tag = tag;
1349 srp_rsp->status = status;
1350
1351 if (sense_data_len) {
1352 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1353 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1354 if (sense_data_len > max_sense_len) {
1355 pr_warn("truncated sense data from %d to %d"
1356 " bytes\n", sense_data_len, max_sense_len);
1357 sense_data_len = max_sense_len;
1358 }
1359
1360 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1361 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1362 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1363 }
1364
1365 return sizeof(*srp_rsp) + sense_data_len;
1366}
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1382 struct srpt_send_ioctx *ioctx,
1383 u8 rsp_code, u64 tag)
1384{
1385 struct srp_rsp *srp_rsp;
1386 int resp_data_len;
1387 int resp_len;
1388
1389 resp_data_len = 4;
1390 resp_len = sizeof(*srp_rsp) + resp_data_len;
1391
1392 srp_rsp = ioctx->ioctx.buf;
1393 BUG_ON(!srp_rsp);
1394 memset(srp_rsp, 0, sizeof(*srp_rsp));
1395
1396 srp_rsp->opcode = SRP_RSP;
1397 srp_rsp->req_lim_delta =
1398 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1399 srp_rsp->tag = tag;
1400
1401 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1402 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1403 srp_rsp->data[3] = rsp_code;
1404
1405 return resp_len;
1406}
1407
1408static int srpt_check_stop_free(struct se_cmd *cmd)
1409{
1410 struct srpt_send_ioctx *ioctx = container_of(cmd,
1411 struct srpt_send_ioctx, cmd);
1412
1413 return target_put_sess_cmd(&ioctx->cmd);
1414}
1415
1416
1417
1418
1419
1420
1421
1422static void srpt_handle_cmd(struct srpt_rdma_ch *ch,
1423 struct srpt_recv_ioctx *recv_ioctx,
1424 struct srpt_send_ioctx *send_ioctx)
1425{
1426 struct se_cmd *cmd;
1427 struct srp_cmd *srp_cmd;
1428 struct scatterlist *sg = NULL;
1429 unsigned sg_cnt = 0;
1430 u64 data_len;
1431 enum dma_data_direction dir;
1432 int rc;
1433
1434 BUG_ON(!send_ioctx);
1435
1436 srp_cmd = recv_ioctx->ioctx.buf;
1437 cmd = &send_ioctx->cmd;
1438 cmd->tag = srp_cmd->tag;
1439
1440 switch (srp_cmd->task_attr) {
1441 case SRP_CMD_SIMPLE_Q:
1442 cmd->sam_task_attr = TCM_SIMPLE_TAG;
1443 break;
1444 case SRP_CMD_ORDERED_Q:
1445 default:
1446 cmd->sam_task_attr = TCM_ORDERED_TAG;
1447 break;
1448 case SRP_CMD_HEAD_OF_Q:
1449 cmd->sam_task_attr = TCM_HEAD_TAG;
1450 break;
1451 case SRP_CMD_ACA:
1452 cmd->sam_task_attr = TCM_ACA_TAG;
1453 break;
1454 }
1455
1456 rc = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &sg, &sg_cnt,
1457 &data_len);
1458 if (rc) {
1459 if (rc != -EAGAIN) {
1460 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1461 srp_cmd->tag);
1462 }
1463 goto release_ioctx;
1464 }
1465
1466 rc = target_submit_cmd_map_sgls(cmd, ch->sess, srp_cmd->cdb,
1467 &send_ioctx->sense_data[0],
1468 scsilun_to_int(&srp_cmd->lun), data_len,
1469 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF,
1470 sg, sg_cnt, NULL, 0, NULL, 0);
1471 if (rc != 0) {
1472 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,
1473 srp_cmd->tag);
1474 goto release_ioctx;
1475 }
1476 return;
1477
1478release_ioctx:
1479 send_ioctx->state = SRPT_STATE_DONE;
1480 srpt_release_cmd(cmd);
1481}
1482
1483static int srp_tmr_to_tcm(int fn)
1484{
1485 switch (fn) {
1486 case SRP_TSK_ABORT_TASK:
1487 return TMR_ABORT_TASK;
1488 case SRP_TSK_ABORT_TASK_SET:
1489 return TMR_ABORT_TASK_SET;
1490 case SRP_TSK_CLEAR_TASK_SET:
1491 return TMR_CLEAR_TASK_SET;
1492 case SRP_TSK_LUN_RESET:
1493 return TMR_LUN_RESET;
1494 case SRP_TSK_CLEAR_ACA:
1495 return TMR_CLEAR_ACA;
1496 default:
1497 return -1;
1498 }
1499}
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1513 struct srpt_recv_ioctx *recv_ioctx,
1514 struct srpt_send_ioctx *send_ioctx)
1515{
1516 struct srp_tsk_mgmt *srp_tsk;
1517 struct se_cmd *cmd;
1518 struct se_session *sess = ch->sess;
1519 int tcm_tmr;
1520 int rc;
1521
1522 BUG_ON(!send_ioctx);
1523
1524 srp_tsk = recv_ioctx->ioctx.buf;
1525 cmd = &send_ioctx->cmd;
1526
1527 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n",
1528 srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, ch,
1529 ch->sess);
1530
1531 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
1532 send_ioctx->cmd.tag = srp_tsk->tag;
1533 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
1534 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,
1535 scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,
1536 GFP_KERNEL, srp_tsk->task_tag,
1537 TARGET_SCF_ACK_KREF);
1538 if (rc != 0) {
1539 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
1540 goto fail;
1541 }
1542 return;
1543fail:
1544 transport_send_check_condition_and_sense(cmd, 0, 0);
1545}
1546
1547
1548
1549
1550
1551
1552static bool
1553srpt_handle_new_iu(struct srpt_rdma_ch *ch, struct srpt_recv_ioctx *recv_ioctx)
1554{
1555 struct srpt_send_ioctx *send_ioctx = NULL;
1556 struct srp_cmd *srp_cmd;
1557 bool res = false;
1558 u8 opcode;
1559
1560 BUG_ON(!ch);
1561 BUG_ON(!recv_ioctx);
1562
1563 if (unlikely(ch->state == CH_CONNECTING))
1564 goto push;
1565
1566 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1567 recv_ioctx->ioctx.dma, srp_max_req_size,
1568 DMA_FROM_DEVICE);
1569
1570 srp_cmd = recv_ioctx->ioctx.buf;
1571 opcode = srp_cmd->opcode;
1572 if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) {
1573 send_ioctx = srpt_get_send_ioctx(ch);
1574 if (unlikely(!send_ioctx))
1575 goto push;
1576 }
1577
1578 if (!list_empty(&recv_ioctx->wait_list)) {
1579 WARN_ON_ONCE(!ch->processing_wait_list);
1580 list_del_init(&recv_ioctx->wait_list);
1581 }
1582
1583 switch (opcode) {
1584 case SRP_CMD:
1585 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1586 break;
1587 case SRP_TSK_MGMT:
1588 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1589 break;
1590 case SRP_I_LOGOUT:
1591 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1592 break;
1593 case SRP_CRED_RSP:
1594 pr_debug("received SRP_CRED_RSP\n");
1595 break;
1596 case SRP_AER_RSP:
1597 pr_debug("received SRP_AER_RSP\n");
1598 break;
1599 case SRP_RSP:
1600 pr_err("Received SRP_RSP\n");
1601 break;
1602 default:
1603 pr_err("received IU with unknown opcode 0x%x\n", opcode);
1604 break;
1605 }
1606
1607 srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);
1608 res = true;
1609
1610out:
1611 return res;
1612
1613push:
1614 if (list_empty(&recv_ioctx->wait_list)) {
1615 WARN_ON_ONCE(ch->processing_wait_list);
1616 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1617 }
1618 goto out;
1619}
1620
1621static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1622{
1623 struct srpt_rdma_ch *ch = cq->cq_context;
1624 struct srpt_recv_ioctx *ioctx =
1625 container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
1626
1627 if (wc->status == IB_WC_SUCCESS) {
1628 int req_lim;
1629
1630 req_lim = atomic_dec_return(&ch->req_lim);
1631 if (unlikely(req_lim < 0))
1632 pr_err("req_lim = %d < 0\n", req_lim);
1633 srpt_handle_new_iu(ch, ioctx);
1634 } else {
1635 pr_info_ratelimited("receiving failed for ioctx %p with status %d\n",
1636 ioctx, wc->status);
1637 }
1638}
1639
1640
1641
1642
1643
1644
1645static void srpt_process_wait_list(struct srpt_rdma_ch *ch)
1646{
1647 struct srpt_recv_ioctx *recv_ioctx, *tmp;
1648
1649 WARN_ON_ONCE(ch->state == CH_CONNECTING);
1650
1651 if (list_empty(&ch->cmd_wait_list))
1652 return;
1653
1654 WARN_ON_ONCE(ch->processing_wait_list);
1655 ch->processing_wait_list = true;
1656 list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list,
1657 wait_list) {
1658 if (!srpt_handle_new_iu(ch, recv_ioctx))
1659 break;
1660 }
1661 ch->processing_wait_list = false;
1662}
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
1682{
1683 struct srpt_rdma_ch *ch = cq->cq_context;
1684 struct srpt_send_ioctx *ioctx =
1685 container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
1686 enum srpt_command_state state;
1687
1688 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1689
1690 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
1691 state != SRPT_STATE_MGMT_RSP_SENT);
1692
1693 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
1694
1695 if (wc->status != IB_WC_SUCCESS)
1696 pr_info("sending response for ioctx 0x%p failed"
1697 " with status %d\n", ioctx, wc->status);
1698
1699 if (state != SRPT_STATE_DONE) {
1700 transport_generic_free_cmd(&ioctx->cmd, 0);
1701 } else {
1702 pr_err("IB completion has been received too late for"
1703 " wr_id = %u.\n", ioctx->ioctx.index);
1704 }
1705
1706 srpt_process_wait_list(ch);
1707}
1708
1709
1710
1711
1712
1713static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
1714{
1715 struct ib_qp_init_attr *qp_init;
1716 struct srpt_port *sport = ch->sport;
1717 struct srpt_device *sdev = sport->sdev;
1718 const struct ib_device_attr *attrs = &sdev->device->attrs;
1719 int sq_size = sport->port_attrib.srp_sq_size;
1720 int i, ret;
1721
1722 WARN_ON(ch->rq_size < 1);
1723
1724 ret = -ENOMEM;
1725 qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);
1726 if (!qp_init)
1727 goto out;
1728
1729retry:
1730 ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + sq_size,
1731 0 , IB_POLL_WORKQUEUE);
1732 if (IS_ERR(ch->cq)) {
1733 ret = PTR_ERR(ch->cq);
1734 pr_err("failed to create CQ cqe= %d ret= %d\n",
1735 ch->rq_size + sq_size, ret);
1736 goto out;
1737 }
1738
1739 qp_init->qp_context = (void *)ch;
1740 qp_init->event_handler
1741 = (void(*)(struct ib_event *, void*))srpt_qp_event;
1742 qp_init->send_cq = ch->cq;
1743 qp_init->recv_cq = ch->cq;
1744 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
1745 qp_init->qp_type = IB_QPT_RC;
1746
1747
1748
1749
1750
1751
1752
1753 qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr);
1754 qp_init->cap.max_rdma_ctxs = sq_size / 2;
1755 qp_init->cap.max_send_sge = min(attrs->max_send_sge,
1756 SRPT_MAX_SG_PER_WQE);
1757 qp_init->port_num = ch->sport->port;
1758 if (sdev->use_srq) {
1759 qp_init->srq = sdev->srq;
1760 } else {
1761 qp_init->cap.max_recv_wr = ch->rq_size;
1762 qp_init->cap.max_recv_sge = min(attrs->max_recv_sge,
1763 SRPT_MAX_SG_PER_WQE);
1764 }
1765
1766 if (ch->using_rdma_cm) {
1767 ret = rdma_create_qp(ch->rdma_cm.cm_id, sdev->pd, qp_init);
1768 ch->qp = ch->rdma_cm.cm_id->qp;
1769 } else {
1770 ch->qp = ib_create_qp(sdev->pd, qp_init);
1771 if (!IS_ERR(ch->qp)) {
1772 ret = srpt_init_ch_qp(ch, ch->qp);
1773 if (ret)
1774 ib_destroy_qp(ch->qp);
1775 } else {
1776 ret = PTR_ERR(ch->qp);
1777 }
1778 }
1779 if (ret) {
1780 bool retry = sq_size > MIN_SRPT_SQ_SIZE;
1781
1782 if (retry) {
1783 pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n",
1784 sq_size, ret);
1785 ib_free_cq(ch->cq);
1786 sq_size = max(sq_size / 2, MIN_SRPT_SQ_SIZE);
1787 goto retry;
1788 } else {
1789 pr_err("failed to create queue pair with sq_size = %d (%d)\n",
1790 sq_size, ret);
1791 goto err_destroy_cq;
1792 }
1793 }
1794
1795 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
1796
1797 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n",
1798 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
1799 qp_init->cap.max_send_wr, ch);
1800
1801 if (!sdev->use_srq)
1802 for (i = 0; i < ch->rq_size; i++)
1803 srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]);
1804
1805out:
1806 kfree(qp_init);
1807 return ret;
1808
1809err_destroy_cq:
1810 ch->qp = NULL;
1811 ib_free_cq(ch->cq);
1812 goto out;
1813}
1814
1815static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
1816{
1817 ib_destroy_qp(ch->qp);
1818 ib_free_cq(ch->cq);
1819}
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831static bool srpt_close_ch(struct srpt_rdma_ch *ch)
1832{
1833 int ret;
1834
1835 if (!srpt_set_ch_state(ch, CH_DRAINING)) {
1836 pr_debug("%s: already closed\n", ch->sess_name);
1837 return false;
1838 }
1839
1840 kref_get(&ch->kref);
1841
1842 ret = srpt_ch_qp_err(ch);
1843 if (ret < 0)
1844 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1845 ch->sess_name, ch->qp->qp_num, ret);
1846
1847 ret = srpt_zerolength_write(ch);
1848 if (ret < 0) {
1849 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1850 ch->sess_name, ch->qp->qp_num, ret);
1851 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
1852 schedule_work(&ch->release_work);
1853 else
1854 WARN_ON_ONCE(true);
1855 }
1856
1857 kref_put(&ch->kref, srpt_free_ch);
1858
1859 return true;
1860}
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
1872{
1873 int ret;
1874
1875 if (!srpt_set_ch_state(ch, CH_DISCONNECTING))
1876 return -ENOTCONN;
1877
1878 if (ch->using_rdma_cm) {
1879 ret = rdma_disconnect(ch->rdma_cm.cm_id);
1880 } else {
1881 ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0);
1882 if (ret < 0)
1883 ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0);
1884 }
1885
1886 if (ret < 0 && srpt_close_ch(ch))
1887 ret = 0;
1888
1889 return ret;
1890}
1891
1892static bool srpt_ch_closed(struct srpt_port *sport, struct srpt_rdma_ch *ch)
1893{
1894 struct srpt_nexus *nexus;
1895 struct srpt_rdma_ch *ch2;
1896 bool res = true;
1897
1898 rcu_read_lock();
1899 list_for_each_entry(nexus, &sport->nexus_list, entry) {
1900 list_for_each_entry(ch2, &nexus->ch_list, list) {
1901 if (ch2 == ch) {
1902 res = false;
1903 goto done;
1904 }
1905 }
1906 }
1907done:
1908 rcu_read_unlock();
1909
1910 return res;
1911}
1912
1913
1914static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)
1915{
1916 struct srpt_port *sport = ch->sport;
1917
1918 pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
1919 ch->state);
1920
1921 mutex_lock(&sport->mutex);
1922 srpt_disconnect_ch(ch);
1923 mutex_unlock(&sport->mutex);
1924
1925 while (wait_event_timeout(sport->ch_releaseQ, srpt_ch_closed(sport, ch),
1926 5 * HZ) == 0)
1927 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
1928 ch->sess_name, ch->qp->qp_num, ch->state);
1929
1930}
1931
1932static void __srpt_close_all_ch(struct srpt_port *sport)
1933{
1934 struct srpt_nexus *nexus;
1935 struct srpt_rdma_ch *ch;
1936
1937 lockdep_assert_held(&sport->mutex);
1938
1939 list_for_each_entry(nexus, &sport->nexus_list, entry) {
1940 list_for_each_entry(ch, &nexus->ch_list, list) {
1941 if (srpt_disconnect_ch(ch) >= 0)
1942 pr_info("Closing channel %s because target %s_%d has been disabled\n",
1943 ch->sess_name,
1944 sport->sdev->device->name, sport->port);
1945 srpt_close_ch(ch);
1946 }
1947 }
1948}
1949
1950
1951
1952
1953
1954static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport,
1955 const u8 i_port_id[16],
1956 const u8 t_port_id[16])
1957{
1958 struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n;
1959
1960 for (;;) {
1961 mutex_lock(&sport->mutex);
1962 list_for_each_entry(n, &sport->nexus_list, entry) {
1963 if (memcmp(n->i_port_id, i_port_id, 16) == 0 &&
1964 memcmp(n->t_port_id, t_port_id, 16) == 0) {
1965 nexus = n;
1966 break;
1967 }
1968 }
1969 if (!nexus && tmp_nexus) {
1970 list_add_tail_rcu(&tmp_nexus->entry,
1971 &sport->nexus_list);
1972 swap(nexus, tmp_nexus);
1973 }
1974 mutex_unlock(&sport->mutex);
1975
1976 if (nexus)
1977 break;
1978 tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
1979 if (!tmp_nexus) {
1980 nexus = ERR_PTR(-ENOMEM);
1981 break;
1982 }
1983 INIT_LIST_HEAD(&tmp_nexus->ch_list);
1984 memcpy(tmp_nexus->i_port_id, i_port_id, 16);
1985 memcpy(tmp_nexus->t_port_id, t_port_id, 16);
1986 }
1987
1988 kfree(tmp_nexus);
1989
1990 return nexus;
1991}
1992
1993static void srpt_set_enabled(struct srpt_port *sport, bool enabled)
1994 __must_hold(&sport->mutex)
1995{
1996 lockdep_assert_held(&sport->mutex);
1997
1998 if (sport->enabled == enabled)
1999 return;
2000 sport->enabled = enabled;
2001 if (!enabled)
2002 __srpt_close_all_ch(sport);
2003}
2004
2005static void srpt_free_ch(struct kref *kref)
2006{
2007 struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);
2008
2009 kfree_rcu(ch, rcu);
2010}
2011
2012static void srpt_release_channel_work(struct work_struct *w)
2013{
2014 struct srpt_rdma_ch *ch;
2015 struct srpt_device *sdev;
2016 struct srpt_port *sport;
2017 struct se_session *se_sess;
2018
2019 ch = container_of(w, struct srpt_rdma_ch, release_work);
2020 pr_debug("%s-%d\n", ch->sess_name, ch->qp->qp_num);
2021
2022 sdev = ch->sport->sdev;
2023 BUG_ON(!sdev);
2024
2025 se_sess = ch->sess;
2026 BUG_ON(!se_sess);
2027
2028 target_sess_cmd_list_set_waiting(se_sess);
2029 target_wait_for_sess_cmds(se_sess);
2030
2031 target_remove_session(se_sess);
2032 ch->sess = NULL;
2033
2034 if (ch->using_rdma_cm)
2035 rdma_destroy_id(ch->rdma_cm.cm_id);
2036 else
2037 ib_destroy_cm_id(ch->ib_cm.cm_id);
2038
2039 srpt_destroy_ch_ib(ch);
2040
2041 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2042 ch->sport->sdev, ch->rq_size,
2043 ch->max_rsp_size, DMA_TO_DEVICE);
2044
2045 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
2046 sdev, ch->rq_size,
2047 srp_max_req_size, DMA_FROM_DEVICE);
2048
2049 sport = ch->sport;
2050 mutex_lock(&sport->mutex);
2051 list_del_rcu(&ch->list);
2052 mutex_unlock(&sport->mutex);
2053
2054 wake_up(&sport->ch_releaseQ);
2055
2056 kref_put(&ch->kref, srpt_free_ch);
2057}
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073static int srpt_cm_req_recv(struct srpt_device *const sdev,
2074 struct ib_cm_id *ib_cm_id,
2075 struct rdma_cm_id *rdma_cm_id,
2076 u8 port_num, __be16 pkey,
2077 const struct srp_login_req *req,
2078 const char *src_addr)
2079{
2080 struct srpt_port *sport = &sdev->port[port_num - 1];
2081 struct srpt_nexus *nexus;
2082 struct srp_login_rsp *rsp = NULL;
2083 struct srp_login_rej *rej = NULL;
2084 union {
2085 struct rdma_conn_param rdma_cm;
2086 struct ib_cm_rep_param ib_cm;
2087 } *rep_param = NULL;
2088 struct srpt_rdma_ch *ch = NULL;
2089 char i_port_id[36];
2090 u32 it_iu_len;
2091 int i, ret;
2092
2093 WARN_ON_ONCE(irqs_disabled());
2094
2095 if (WARN_ON(!sdev || !req))
2096 return -EINVAL;
2097
2098 it_iu_len = be32_to_cpu(req->req_it_iu_len);
2099
2100 pr_info("Received SRP_LOGIN_REQ with i_port_id %pI6, t_port_id %pI6 and it_iu_len %d on port %d (guid=%pI6); pkey %#04x\n",
2101 req->initiator_port_id, req->target_port_id, it_iu_len,
2102 port_num, &sport->gid, be16_to_cpu(pkey));
2103
2104 nexus = srpt_get_nexus(sport, req->initiator_port_id,
2105 req->target_port_id);
2106 if (IS_ERR(nexus)) {
2107 ret = PTR_ERR(nexus);
2108 goto out;
2109 }
2110
2111 ret = -ENOMEM;
2112 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
2113 rej = kzalloc(sizeof(*rej), GFP_KERNEL);
2114 rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);
2115 if (!rsp || !rej || !rep_param)
2116 goto out;
2117
2118 ret = -EINVAL;
2119 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
2120 rej->reason = cpu_to_be32(
2121 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
2122 pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n",
2123 it_iu_len, 64, srp_max_req_size);
2124 goto reject;
2125 }
2126
2127 if (!sport->enabled) {
2128 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2129 pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n",
2130 sport->sdev->device->name, port_num);
2131 goto reject;
2132 }
2133
2134 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
2135 || *(__be64 *)(req->target_port_id + 8) !=
2136 cpu_to_be64(srpt_service_guid)) {
2137 rej->reason = cpu_to_be32(
2138 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
2139 pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n");
2140 goto reject;
2141 }
2142
2143 ret = -ENOMEM;
2144 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
2145 if (!ch) {
2146 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2147 pr_err("rejected SRP_LOGIN_REQ because out of memory.\n");
2148 goto reject;
2149 }
2150
2151 kref_init(&ch->kref);
2152 ch->pkey = be16_to_cpu(pkey);
2153 ch->nexus = nexus;
2154 ch->zw_cqe.done = srpt_zerolength_write_done;
2155 INIT_WORK(&ch->release_work, srpt_release_channel_work);
2156 ch->sport = sport;
2157 if (ib_cm_id) {
2158 ch->ib_cm.cm_id = ib_cm_id;
2159 ib_cm_id->context = ch;
2160 } else {
2161 ch->using_rdma_cm = true;
2162 ch->rdma_cm.cm_id = rdma_cm_id;
2163 rdma_cm_id->context = ch;
2164 }
2165
2166
2167
2168
2169
2170 ch->rq_size = min(MAX_SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr);
2171 spin_lock_init(&ch->spinlock);
2172 ch->state = CH_CONNECTING;
2173 INIT_LIST_HEAD(&ch->cmd_wait_list);
2174 ch->max_rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
2175
2176 ch->ioctx_ring = (struct srpt_send_ioctx **)
2177 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2178 sizeof(*ch->ioctx_ring[0]),
2179 ch->max_rsp_size, DMA_TO_DEVICE);
2180 if (!ch->ioctx_ring) {
2181 pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n");
2182 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2183 goto free_ch;
2184 }
2185
2186 INIT_LIST_HEAD(&ch->free_list);
2187 for (i = 0; i < ch->rq_size; i++) {
2188 ch->ioctx_ring[i]->ch = ch;
2189 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
2190 }
2191 if (!sdev->use_srq) {
2192 ch->ioctx_recv_ring = (struct srpt_recv_ioctx **)
2193 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2194 sizeof(*ch->ioctx_recv_ring[0]),
2195 srp_max_req_size,
2196 DMA_FROM_DEVICE);
2197 if (!ch->ioctx_recv_ring) {
2198 pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n");
2199 rej->reason =
2200 cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2201 goto free_ring;
2202 }
2203 for (i = 0; i < ch->rq_size; i++)
2204 INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list);
2205 }
2206
2207 ret = srpt_create_ch_ib(ch);
2208 if (ret) {
2209 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2210 pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n");
2211 goto free_recv_ring;
2212 }
2213
2214 strlcpy(ch->sess_name, src_addr, sizeof(ch->sess_name));
2215 snprintf(i_port_id, sizeof(i_port_id), "0x%016llx%016llx",
2216 be64_to_cpu(*(__be64 *)nexus->i_port_id),
2217 be64_to_cpu(*(__be64 *)(nexus->i_port_id + 8)));
2218
2219 pr_debug("registering session %s\n", ch->sess_name);
2220
2221 if (sport->port_guid_tpg.se_tpg_wwn)
2222 ch->sess = target_setup_session(&sport->port_guid_tpg, 0, 0,
2223 TARGET_PROT_NORMAL,
2224 ch->sess_name, ch, NULL);
2225 if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess))
2226 ch->sess = target_setup_session(&sport->port_gid_tpg, 0, 0,
2227 TARGET_PROT_NORMAL, i_port_id, ch,
2228 NULL);
2229
2230 if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess))
2231 ch->sess = target_setup_session(&sport->port_gid_tpg, 0, 0,
2232 TARGET_PROT_NORMAL,
2233 i_port_id + 2, ch, NULL);
2234 if (IS_ERR_OR_NULL(ch->sess)) {
2235 WARN_ON_ONCE(ch->sess == NULL);
2236 ret = PTR_ERR(ch->sess);
2237 ch->sess = NULL;
2238 pr_info("Rejected login for initiator %s: ret = %d.\n",
2239 ch->sess_name, ret);
2240 rej->reason = cpu_to_be32(ret == -ENOMEM ?
2241 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES :
2242 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2243 goto destroy_ib;
2244 }
2245
2246 mutex_lock(&sport->mutex);
2247
2248 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
2249 struct srpt_rdma_ch *ch2;
2250
2251 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
2252
2253 list_for_each_entry(ch2, &nexus->ch_list, list) {
2254 if (srpt_disconnect_ch(ch2) < 0)
2255 continue;
2256 pr_info("Relogin - closed existing channel %s\n",
2257 ch2->sess_name);
2258 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
2259 }
2260 } else {
2261 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
2262 }
2263
2264 list_add_tail_rcu(&ch->list, &nexus->ch_list);
2265
2266 if (!sport->enabled) {
2267 rej->reason = cpu_to_be32(
2268 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2269 pr_info("rejected SRP_LOGIN_REQ because target %s_%d is not enabled\n",
2270 sdev->device->name, port_num);
2271 mutex_unlock(&sport->mutex);
2272 goto reject;
2273 }
2274
2275 mutex_unlock(&sport->mutex);
2276
2277 ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rtr(ch, ch->qp);
2278 if (ret) {
2279 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2280 pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n",
2281 ret);
2282 goto reject;
2283 }
2284
2285 pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch->sess,
2286 ch->sess_name, ch);
2287
2288
2289 rsp->opcode = SRP_LOGIN_RSP;
2290 rsp->tag = req->tag;
2291 rsp->max_it_iu_len = req->req_it_iu_len;
2292 rsp->max_ti_iu_len = req->req_it_iu_len;
2293 ch->max_ti_iu_len = it_iu_len;
2294 rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2295 SRP_BUF_FORMAT_INDIRECT);
2296 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2297 atomic_set(&ch->req_lim, ch->rq_size);
2298 atomic_set(&ch->req_lim_delta, 0);
2299
2300
2301 if (ch->using_rdma_cm) {
2302 rep_param->rdma_cm.private_data = (void *)rsp;
2303 rep_param->rdma_cm.private_data_len = sizeof(*rsp);
2304 rep_param->rdma_cm.rnr_retry_count = 7;
2305 rep_param->rdma_cm.flow_control = 1;
2306 rep_param->rdma_cm.responder_resources = 4;
2307 rep_param->rdma_cm.initiator_depth = 4;
2308 } else {
2309 rep_param->ib_cm.qp_num = ch->qp->qp_num;
2310 rep_param->ib_cm.private_data = (void *)rsp;
2311 rep_param->ib_cm.private_data_len = sizeof(*rsp);
2312 rep_param->ib_cm.rnr_retry_count = 7;
2313 rep_param->ib_cm.flow_control = 1;
2314 rep_param->ib_cm.failover_accepted = 0;
2315 rep_param->ib_cm.srq = 1;
2316 rep_param->ib_cm.responder_resources = 4;
2317 rep_param->ib_cm.initiator_depth = 4;
2318 }
2319
2320
2321
2322
2323
2324 mutex_lock(&sport->mutex);
2325 if (sport->enabled && ch->state == CH_CONNECTING) {
2326 if (ch->using_rdma_cm)
2327 ret = rdma_accept(rdma_cm_id, &rep_param->rdma_cm);
2328 else
2329 ret = ib_send_cm_rep(ib_cm_id, &rep_param->ib_cm);
2330 } else {
2331 ret = -EINVAL;
2332 }
2333 mutex_unlock(&sport->mutex);
2334
2335 switch (ret) {
2336 case 0:
2337 break;
2338 case -EINVAL:
2339 goto reject;
2340 default:
2341 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2342 pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n",
2343 ret);
2344 goto reject;
2345 }
2346
2347 goto out;
2348
2349destroy_ib:
2350 srpt_destroy_ch_ib(ch);
2351
2352free_recv_ring:
2353 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
2354 ch->sport->sdev, ch->rq_size,
2355 srp_max_req_size, DMA_FROM_DEVICE);
2356
2357free_ring:
2358 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2359 ch->sport->sdev, ch->rq_size,
2360 ch->max_rsp_size, DMA_TO_DEVICE);
2361
2362free_ch:
2363 if (rdma_cm_id)
2364 rdma_cm_id->context = NULL;
2365 else
2366 ib_cm_id->context = NULL;
2367 kfree(ch);
2368 ch = NULL;
2369
2370 WARN_ON_ONCE(ret == 0);
2371
2372reject:
2373 pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason));
2374 rej->opcode = SRP_LOGIN_REJ;
2375 rej->tag = req->tag;
2376 rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2377 SRP_BUF_FORMAT_INDIRECT);
2378
2379 if (rdma_cm_id)
2380 rdma_reject(rdma_cm_id, rej, sizeof(*rej));
2381 else
2382 ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2383 rej, sizeof(*rej));
2384
2385 if (ch && ch->sess) {
2386 srpt_close_ch(ch);
2387
2388
2389
2390
2391 ret = 0;
2392 }
2393
2394out:
2395 kfree(rep_param);
2396 kfree(rsp);
2397 kfree(rej);
2398
2399 return ret;
2400}
2401
2402static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id,
2403 const struct ib_cm_req_event_param *param,
2404 void *private_data)
2405{
2406 char sguid[40];
2407
2408 srpt_format_guid(sguid, sizeof(sguid),
2409 ¶m->primary_path->dgid.global.interface_id);
2410
2411 return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port,
2412 param->primary_path->pkey,
2413 private_data, sguid);
2414}
2415
2416static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id,
2417 struct rdma_cm_event *event)
2418{
2419 struct srpt_device *sdev;
2420 struct srp_login_req req;
2421 const struct srp_login_req_rdma *req_rdma;
2422 char src_addr[40];
2423
2424 sdev = ib_get_client_data(cm_id->device, &srpt_client);
2425 if (!sdev)
2426 return -ECONNREFUSED;
2427
2428 if (event->param.conn.private_data_len < sizeof(*req_rdma))
2429 return -EINVAL;
2430
2431
2432 req_rdma = event->param.conn.private_data;
2433 memset(&req, 0, sizeof(req));
2434 req.opcode = req_rdma->opcode;
2435 req.tag = req_rdma->tag;
2436 req.req_it_iu_len = req_rdma->req_it_iu_len;
2437 req.req_buf_fmt = req_rdma->req_buf_fmt;
2438 req.req_flags = req_rdma->req_flags;
2439 memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16);
2440 memcpy(req.target_port_id, req_rdma->target_port_id, 16);
2441
2442 snprintf(src_addr, sizeof(src_addr), "%pIS",
2443 &cm_id->route.addr.src_addr);
2444
2445 return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num,
2446 cm_id->route.path_rec->pkey, &req, src_addr);
2447}
2448
2449static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,
2450 enum ib_cm_rej_reason reason,
2451 const u8 *private_data,
2452 u8 private_data_len)
2453{
2454 char *priv = NULL;
2455 int i;
2456
2457 if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,
2458 GFP_KERNEL))) {
2459 for (i = 0; i < private_data_len; i++)
2460 sprintf(priv + 3 * i, " %02x", private_data[i]);
2461 }
2462 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2463 ch->sess_name, ch->qp->qp_num, reason, private_data_len ?
2464 "; private data" : "", priv ? priv : " (?)");
2465 kfree(priv);
2466}
2467
2468
2469
2470
2471
2472
2473
2474
2475static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
2476{
2477 int ret;
2478
2479 ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp);
2480 if (ret < 0) {
2481 pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name,
2482 ch->qp->qp_num);
2483 srpt_close_ch(ch);
2484 return;
2485 }
2486
2487
2488
2489
2490
2491
2492 if (!srpt_set_ch_state(ch, CH_LIVE)) {
2493 pr_err("%s-%d: channel transition to LIVE state failed\n",
2494 ch->sess_name, ch->qp->qp_num);
2495 return;
2496 }
2497
2498
2499 ret = srpt_zerolength_write(ch);
2500 WARN_ONCE(ret < 0, "%d\n", ret);
2501}
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515static int srpt_cm_handler(struct ib_cm_id *cm_id,
2516 const struct ib_cm_event *event)
2517{
2518 struct srpt_rdma_ch *ch = cm_id->context;
2519 int ret;
2520
2521 ret = 0;
2522 switch (event->event) {
2523 case IB_CM_REQ_RECEIVED:
2524 ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd,
2525 event->private_data);
2526 break;
2527 case IB_CM_REJ_RECEIVED:
2528 srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,
2529 event->private_data,
2530 IB_CM_REJ_PRIVATE_DATA_SIZE);
2531 break;
2532 case IB_CM_RTU_RECEIVED:
2533 case IB_CM_USER_ESTABLISHED:
2534 srpt_cm_rtu_recv(ch);
2535 break;
2536 case IB_CM_DREQ_RECEIVED:
2537 srpt_disconnect_ch(ch);
2538 break;
2539 case IB_CM_DREP_RECEIVED:
2540 pr_info("Received CM DREP message for ch %s-%d.\n",
2541 ch->sess_name, ch->qp->qp_num);
2542 srpt_close_ch(ch);
2543 break;
2544 case IB_CM_TIMEWAIT_EXIT:
2545 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2546 ch->sess_name, ch->qp->qp_num);
2547 srpt_close_ch(ch);
2548 break;
2549 case IB_CM_REP_ERROR:
2550 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
2551 ch->qp->qp_num);
2552 break;
2553 case IB_CM_DREQ_ERROR:
2554 pr_info("Received CM DREQ ERROR event.\n");
2555 break;
2556 case IB_CM_MRA_RECEIVED:
2557 pr_info("Received CM MRA event\n");
2558 break;
2559 default:
2560 pr_err("received unrecognized CM event %d\n", event->event);
2561 break;
2562 }
2563
2564 return ret;
2565}
2566
2567static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id,
2568 struct rdma_cm_event *event)
2569{
2570 struct srpt_rdma_ch *ch = cm_id->context;
2571 int ret = 0;
2572
2573 switch (event->event) {
2574 case RDMA_CM_EVENT_CONNECT_REQUEST:
2575 ret = srpt_rdma_cm_req_recv(cm_id, event);
2576 break;
2577 case RDMA_CM_EVENT_REJECTED:
2578 srpt_cm_rej_recv(ch, event->status,
2579 event->param.conn.private_data,
2580 event->param.conn.private_data_len);
2581 break;
2582 case RDMA_CM_EVENT_ESTABLISHED:
2583 srpt_cm_rtu_recv(ch);
2584 break;
2585 case RDMA_CM_EVENT_DISCONNECTED:
2586 if (ch->state < CH_DISCONNECTING)
2587 srpt_disconnect_ch(ch);
2588 else
2589 srpt_close_ch(ch);
2590 break;
2591 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2592 srpt_close_ch(ch);
2593 break;
2594 case RDMA_CM_EVENT_UNREACHABLE:
2595 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
2596 ch->qp->qp_num);
2597 break;
2598 case RDMA_CM_EVENT_DEVICE_REMOVAL:
2599 case RDMA_CM_EVENT_ADDR_CHANGE:
2600 break;
2601 default:
2602 pr_err("received unrecognized RDMA CM event %d\n",
2603 event->event);
2604 break;
2605 }
2606
2607 return ret;
2608}
2609
2610static int srpt_write_pending_status(struct se_cmd *se_cmd)
2611{
2612 struct srpt_send_ioctx *ioctx;
2613
2614 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2615 return ioctx->state == SRPT_STATE_NEED_DATA;
2616}
2617
2618
2619
2620
2621static int srpt_write_pending(struct se_cmd *se_cmd)
2622{
2623 struct srpt_send_ioctx *ioctx =
2624 container_of(se_cmd, struct srpt_send_ioctx, cmd);
2625 struct srpt_rdma_ch *ch = ioctx->ch;
2626 struct ib_send_wr *first_wr = NULL;
2627 struct ib_cqe *cqe = &ioctx->rdma_cqe;
2628 enum srpt_command_state new_state;
2629 int ret, i;
2630
2631 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2632 WARN_ON(new_state == SRPT_STATE_DONE);
2633
2634 if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) {
2635 pr_warn("%s: IB send queue full (needed %d)\n",
2636 __func__, ioctx->n_rdma);
2637 ret = -ENOMEM;
2638 goto out_undo;
2639 }
2640
2641 cqe->done = srpt_rdma_read_done;
2642 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2643 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2644
2645 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port,
2646 cqe, first_wr);
2647 cqe = NULL;
2648 }
2649
2650 ret = ib_post_send(ch->qp, first_wr, NULL);
2651 if (ret) {
2652 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
2653 __func__, ret, ioctx->n_rdma,
2654 atomic_read(&ch->sq_wr_avail));
2655 goto out_undo;
2656 }
2657
2658 return 0;
2659out_undo:
2660 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
2661 return ret;
2662}
2663
2664static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2665{
2666 switch (tcm_mgmt_status) {
2667 case TMR_FUNCTION_COMPLETE:
2668 return SRP_TSK_MGMT_SUCCESS;
2669 case TMR_FUNCTION_REJECTED:
2670 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
2671 }
2672 return SRP_TSK_MGMT_FAILED;
2673}
2674
2675
2676
2677
2678
2679
2680
2681
2682static void srpt_queue_response(struct se_cmd *cmd)
2683{
2684 struct srpt_send_ioctx *ioctx =
2685 container_of(cmd, struct srpt_send_ioctx, cmd);
2686 struct srpt_rdma_ch *ch = ioctx->ch;
2687 struct srpt_device *sdev = ch->sport->sdev;
2688 struct ib_send_wr send_wr, *first_wr = &send_wr;
2689 struct ib_sge sge;
2690 enum srpt_command_state state;
2691 int resp_len, ret, i;
2692 u8 srp_tm_status;
2693
2694 BUG_ON(!ch);
2695
2696 state = ioctx->state;
2697 switch (state) {
2698 case SRPT_STATE_NEW:
2699 case SRPT_STATE_DATA_IN:
2700 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
2701 break;
2702 case SRPT_STATE_MGMT:
2703 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
2704 break;
2705 default:
2706 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2707 ch, ioctx->ioctx.index, ioctx->state);
2708 break;
2709 }
2710
2711 if (unlikely(WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT)))
2712 return;
2713
2714
2715 if (ioctx->cmd.data_direction == DMA_FROM_DEVICE &&
2716 ioctx->cmd.data_length &&
2717 !ioctx->queue_status_only) {
2718 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2719 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2720
2721 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,
2722 ch->sport->port, NULL, first_wr);
2723 }
2724 }
2725
2726 if (state != SRPT_STATE_MGMT)
2727 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
2728 cmd->scsi_status);
2729 else {
2730 srp_tm_status
2731 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
2732 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
2733 ioctx->cmd.tag);
2734 }
2735
2736 atomic_inc(&ch->req_lim);
2737
2738 if (unlikely(atomic_sub_return(1 + ioctx->n_rdma,
2739 &ch->sq_wr_avail) < 0)) {
2740 pr_warn("%s: IB send queue full (needed %d)\n",
2741 __func__, ioctx->n_rdma);
2742 ret = -ENOMEM;
2743 goto out;
2744 }
2745
2746 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len,
2747 DMA_TO_DEVICE);
2748
2749 sge.addr = ioctx->ioctx.dma;
2750 sge.length = resp_len;
2751 sge.lkey = sdev->lkey;
2752
2753 ioctx->ioctx.cqe.done = srpt_send_done;
2754 send_wr.next = NULL;
2755 send_wr.wr_cqe = &ioctx->ioctx.cqe;
2756 send_wr.sg_list = &sge;
2757 send_wr.num_sge = 1;
2758 send_wr.opcode = IB_WR_SEND;
2759 send_wr.send_flags = IB_SEND_SIGNALED;
2760
2761 ret = ib_post_send(ch->qp, first_wr, NULL);
2762 if (ret < 0) {
2763 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
2764 __func__, ioctx->cmd.tag, ret);
2765 goto out;
2766 }
2767
2768 return;
2769
2770out:
2771 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
2772 atomic_dec(&ch->req_lim);
2773 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
2774 target_put_sess_cmd(&ioctx->cmd);
2775}
2776
2777static int srpt_queue_data_in(struct se_cmd *cmd)
2778{
2779 srpt_queue_response(cmd);
2780 return 0;
2781}
2782
2783static void srpt_queue_tm_rsp(struct se_cmd *cmd)
2784{
2785 srpt_queue_response(cmd);
2786}
2787
2788static void srpt_aborted_task(struct se_cmd *cmd)
2789{
2790}
2791
2792static int srpt_queue_status(struct se_cmd *cmd)
2793{
2794 struct srpt_send_ioctx *ioctx;
2795
2796 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
2797 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
2798 if (cmd->se_cmd_flags &
2799 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
2800 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
2801 ioctx->queue_status_only = true;
2802 srpt_queue_response(cmd);
2803 return 0;
2804}
2805
2806static void srpt_refresh_port_work(struct work_struct *work)
2807{
2808 struct srpt_port *sport = container_of(work, struct srpt_port, work);
2809
2810 srpt_refresh_port(sport);
2811}
2812
2813static bool srpt_ch_list_empty(struct srpt_port *sport)
2814{
2815 struct srpt_nexus *nexus;
2816 bool res = true;
2817
2818 rcu_read_lock();
2819 list_for_each_entry(nexus, &sport->nexus_list, entry)
2820 if (!list_empty(&nexus->ch_list))
2821 res = false;
2822 rcu_read_unlock();
2823
2824 return res;
2825}
2826
2827
2828
2829
2830
2831static int srpt_release_sport(struct srpt_port *sport)
2832{
2833 struct srpt_nexus *nexus, *next_n;
2834 struct srpt_rdma_ch *ch;
2835
2836 WARN_ON_ONCE(irqs_disabled());
2837
2838 mutex_lock(&sport->mutex);
2839 srpt_set_enabled(sport, false);
2840 mutex_unlock(&sport->mutex);
2841
2842 while (wait_event_timeout(sport->ch_releaseQ,
2843 srpt_ch_list_empty(sport), 5 * HZ) <= 0) {
2844 pr_info("%s_%d: waiting for session unregistration ...\n",
2845 sport->sdev->device->name, sport->port);
2846 rcu_read_lock();
2847 list_for_each_entry(nexus, &sport->nexus_list, entry) {
2848 list_for_each_entry(ch, &nexus->ch_list, list) {
2849 pr_info("%s-%d: state %s\n",
2850 ch->sess_name, ch->qp->qp_num,
2851 get_ch_state_name(ch->state));
2852 }
2853 }
2854 rcu_read_unlock();
2855 }
2856
2857 mutex_lock(&sport->mutex);
2858 list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) {
2859 list_del(&nexus->entry);
2860 kfree_rcu(nexus, rcu);
2861 }
2862 mutex_unlock(&sport->mutex);
2863
2864 return 0;
2865}
2866
2867static struct se_wwn *__srpt_lookup_wwn(const char *name)
2868{
2869 struct ib_device *dev;
2870 struct srpt_device *sdev;
2871 struct srpt_port *sport;
2872 int i;
2873
2874 list_for_each_entry(sdev, &srpt_dev_list, list) {
2875 dev = sdev->device;
2876 if (!dev)
2877 continue;
2878
2879 for (i = 0; i < dev->phys_port_cnt; i++) {
2880 sport = &sdev->port[i];
2881
2882 if (strcmp(sport->port_guid, name) == 0)
2883 return &sport->port_guid_wwn;
2884 if (strcmp(sport->port_gid, name) == 0)
2885 return &sport->port_gid_wwn;
2886 }
2887 }
2888
2889 return NULL;
2890}
2891
2892static struct se_wwn *srpt_lookup_wwn(const char *name)
2893{
2894 struct se_wwn *wwn;
2895
2896 spin_lock(&srpt_dev_lock);
2897 wwn = __srpt_lookup_wwn(name);
2898 spin_unlock(&srpt_dev_lock);
2899
2900 return wwn;
2901}
2902
2903static void srpt_free_srq(struct srpt_device *sdev)
2904{
2905 if (!sdev->srq)
2906 return;
2907
2908 ib_destroy_srq(sdev->srq);
2909 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
2910 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
2911 sdev->srq = NULL;
2912}
2913
2914static int srpt_alloc_srq(struct srpt_device *sdev)
2915{
2916 struct ib_srq_init_attr srq_attr = {
2917 .event_handler = srpt_srq_event,
2918 .srq_context = (void *)sdev,
2919 .attr.max_wr = sdev->srq_size,
2920 .attr.max_sge = 1,
2921 .srq_type = IB_SRQT_BASIC,
2922 };
2923 struct ib_device *device = sdev->device;
2924 struct ib_srq *srq;
2925 int i;
2926
2927 WARN_ON_ONCE(sdev->srq);
2928 srq = ib_create_srq(sdev->pd, &srq_attr);
2929 if (IS_ERR(srq)) {
2930 pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq));
2931 return PTR_ERR(srq);
2932 }
2933
2934 pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size,
2935 sdev->device->attrs.max_srq_wr, device->name);
2936
2937 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
2938 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
2939 sizeof(*sdev->ioctx_ring[0]),
2940 srp_max_req_size, DMA_FROM_DEVICE);
2941 if (!sdev->ioctx_ring) {
2942 ib_destroy_srq(srq);
2943 return -ENOMEM;
2944 }
2945
2946 sdev->use_srq = true;
2947 sdev->srq = srq;
2948
2949 for (i = 0; i < sdev->srq_size; ++i) {
2950 INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list);
2951 srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]);
2952 }
2953
2954 return 0;
2955}
2956
2957static int srpt_use_srq(struct srpt_device *sdev, bool use_srq)
2958{
2959 struct ib_device *device = sdev->device;
2960 int ret = 0;
2961
2962 if (!use_srq) {
2963 srpt_free_srq(sdev);
2964 sdev->use_srq = false;
2965 } else if (use_srq && !sdev->srq) {
2966 ret = srpt_alloc_srq(sdev);
2967 }
2968 pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__, device->name,
2969 sdev->use_srq, ret);
2970 return ret;
2971}
2972
2973
2974
2975
2976
2977static void srpt_add_one(struct ib_device *device)
2978{
2979 struct srpt_device *sdev;
2980 struct srpt_port *sport;
2981 int i, ret;
2982
2983 pr_debug("device = %p\n", device);
2984
2985 sdev = kzalloc(struct_size(sdev, port, device->phys_port_cnt),
2986 GFP_KERNEL);
2987 if (!sdev)
2988 goto err;
2989
2990 sdev->device = device;
2991 mutex_init(&sdev->sdev_mutex);
2992
2993 sdev->pd = ib_alloc_pd(device, 0);
2994 if (IS_ERR(sdev->pd))
2995 goto free_dev;
2996
2997 sdev->lkey = sdev->pd->local_dma_lkey;
2998
2999 sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
3000
3001 srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq);
3002
3003 if (!srpt_service_guid)
3004 srpt_service_guid = be64_to_cpu(device->node_guid);
3005
3006 if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND)
3007 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
3008 if (IS_ERR(sdev->cm_id)) {
3009 pr_info("ib_create_cm_id() failed: %ld\n",
3010 PTR_ERR(sdev->cm_id));
3011 sdev->cm_id = NULL;
3012 if (!rdma_cm_id)
3013 goto err_ring;
3014 }
3015
3016
3017 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
3018 "pkey=ffff,service_id=%016llx\n", srpt_service_guid,
3019 srpt_service_guid, srpt_service_guid);
3020
3021
3022
3023
3024
3025
3026
3027 ret = sdev->cm_id ?
3028 ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0) :
3029 0;
3030 if (ret < 0) {
3031 pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret,
3032 sdev->cm_id->state);
3033 goto err_cm;
3034 }
3035
3036 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
3037 srpt_event_handler);
3038 ib_register_event_handler(&sdev->event_handler);
3039
3040 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
3041 sport = &sdev->port[i - 1];
3042 INIT_LIST_HEAD(&sport->nexus_list);
3043 init_waitqueue_head(&sport->ch_releaseQ);
3044 mutex_init(&sport->mutex);
3045 sport->sdev = sdev;
3046 sport->port = i;
3047 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
3048 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
3049 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
3050 sport->port_attrib.use_srq = false;
3051 INIT_WORK(&sport->work, srpt_refresh_port_work);
3052
3053 if (srpt_refresh_port(sport)) {
3054 pr_err("MAD registration failed for %s-%d.\n",
3055 sdev->device->name, i);
3056 goto err_event;
3057 }
3058 }
3059
3060 spin_lock(&srpt_dev_lock);
3061 list_add_tail(&sdev->list, &srpt_dev_list);
3062 spin_unlock(&srpt_dev_lock);
3063
3064out:
3065 ib_set_client_data(device, &srpt_client, sdev);
3066 pr_debug("added %s.\n", device->name);
3067 return;
3068
3069err_event:
3070 ib_unregister_event_handler(&sdev->event_handler);
3071err_cm:
3072 if (sdev->cm_id)
3073 ib_destroy_cm_id(sdev->cm_id);
3074err_ring:
3075 srpt_free_srq(sdev);
3076 ib_dealloc_pd(sdev->pd);
3077free_dev:
3078 kfree(sdev);
3079err:
3080 sdev = NULL;
3081 pr_info("%s(%s) failed.\n", __func__, device->name);
3082 goto out;
3083}
3084
3085
3086
3087
3088
3089
3090static void srpt_remove_one(struct ib_device *device, void *client_data)
3091{
3092 struct srpt_device *sdev = client_data;
3093 int i;
3094
3095 if (!sdev) {
3096 pr_info("%s(%s): nothing to do.\n", __func__, device->name);
3097 return;
3098 }
3099
3100 srpt_unregister_mad_agent(sdev);
3101
3102 ib_unregister_event_handler(&sdev->event_handler);
3103
3104
3105 for (i = 0; i < sdev->device->phys_port_cnt; i++)
3106 cancel_work_sync(&sdev->port[i].work);
3107
3108 if (sdev->cm_id)
3109 ib_destroy_cm_id(sdev->cm_id);
3110
3111 ib_set_client_data(device, &srpt_client, NULL);
3112
3113
3114
3115
3116
3117
3118 spin_lock(&srpt_dev_lock);
3119 list_del(&sdev->list);
3120 spin_unlock(&srpt_dev_lock);
3121
3122 for (i = 0; i < sdev->device->phys_port_cnt; i++)
3123 srpt_release_sport(&sdev->port[i]);
3124
3125 srpt_free_srq(sdev);
3126
3127 ib_dealloc_pd(sdev->pd);
3128
3129 kfree(sdev);
3130}
3131
3132static struct ib_client srpt_client = {
3133 .name = DRV_NAME,
3134 .add = srpt_add_one,
3135 .remove = srpt_remove_one
3136};
3137
3138static int srpt_check_true(struct se_portal_group *se_tpg)
3139{
3140 return 1;
3141}
3142
3143static int srpt_check_false(struct se_portal_group *se_tpg)
3144{
3145 return 0;
3146}
3147
3148static char *srpt_get_fabric_name(void)
3149{
3150 return "srpt";
3151}
3152
3153static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg)
3154{
3155 return tpg->se_tpg_wwn->priv;
3156}
3157
3158static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
3159{
3160 struct srpt_port *sport = srpt_tpg_to_sport(tpg);
3161
3162 WARN_ON_ONCE(tpg != &sport->port_guid_tpg &&
3163 tpg != &sport->port_gid_tpg);
3164 return tpg == &sport->port_guid_tpg ? sport->port_guid :
3165 sport->port_gid;
3166}
3167
3168static u16 srpt_get_tag(struct se_portal_group *tpg)
3169{
3170 return 1;
3171}
3172
3173static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
3174{
3175 return 1;
3176}
3177
3178static void srpt_release_cmd(struct se_cmd *se_cmd)
3179{
3180 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
3181 struct srpt_send_ioctx, cmd);
3182 struct srpt_rdma_ch *ch = ioctx->ch;
3183 unsigned long flags;
3184
3185 WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE &&
3186 !(ioctx->cmd.transport_state & CMD_T_ABORTED));
3187
3188 if (ioctx->n_rw_ctx) {
3189 srpt_free_rw_ctxs(ch, ioctx);
3190 ioctx->n_rw_ctx = 0;
3191 }
3192
3193 spin_lock_irqsave(&ch->spinlock, flags);
3194 list_add(&ioctx->free_list, &ch->free_list);
3195 spin_unlock_irqrestore(&ch->spinlock, flags);
3196}
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206static void srpt_close_session(struct se_session *se_sess)
3207{
3208 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
3209
3210 srpt_disconnect_ch_sync(ch);
3211}
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222static u32 srpt_sess_get_index(struct se_session *se_sess)
3223{
3224 return 0;
3225}
3226
3227static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
3228{
3229}
3230
3231
3232static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
3233{
3234 struct srpt_send_ioctx *ioctx;
3235
3236 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3237 return ioctx->state;
3238}
3239
3240static int srpt_parse_guid(u64 *guid, const char *name)
3241{
3242 u16 w[4];
3243 int ret = -EINVAL;
3244
3245 if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4)
3246 goto out;
3247 *guid = get_unaligned_be64(w);
3248 ret = 0;
3249out:
3250 return ret;
3251}
3252
3253
3254
3255
3256
3257
3258static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
3259{
3260 const char *p;
3261 unsigned len, count, leading_zero_bytes;
3262 int ret;
3263
3264 p = name;
3265 if (strncasecmp(p, "0x", 2) == 0)
3266 p += 2;
3267 ret = -EINVAL;
3268 len = strlen(p);
3269 if (len % 2)
3270 goto out;
3271 count = min(len / 2, 16U);
3272 leading_zero_bytes = 16 - count;
3273 memset(i_port_id, 0, leading_zero_bytes);
3274 ret = hex2bin(i_port_id + leading_zero_bytes, p, count);
3275
3276out:
3277 return ret;
3278}
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
3293{
3294 struct sockaddr_storage sa;
3295 u64 guid;
3296 u8 i_port_id[16];
3297 int ret;
3298
3299 ret = srpt_parse_guid(&guid, name);
3300 if (ret < 0)
3301 ret = srpt_parse_i_port_id(i_port_id, name);
3302 if (ret < 0)
3303 ret = inet_pton_with_scope(&init_net, AF_UNSPEC, name, NULL,
3304 &sa);
3305 if (ret < 0)
3306 pr_err("invalid initiator port ID %s\n", name);
3307 return ret;
3308}
3309
3310static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,
3311 char *page)
3312{
3313 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3314 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3315
3316 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
3317}
3318
3319static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,
3320 const char *page, size_t count)
3321{
3322 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3323 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3324 unsigned long val;
3325 int ret;
3326
3327 ret = kstrtoul(page, 0, &val);
3328 if (ret < 0) {
3329 pr_err("kstrtoul() failed with ret: %d\n", ret);
3330 return -EINVAL;
3331 }
3332 if (val > MAX_SRPT_RDMA_SIZE) {
3333 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
3334 MAX_SRPT_RDMA_SIZE);
3335 return -EINVAL;
3336 }
3337 if (val < DEFAULT_MAX_RDMA_SIZE) {
3338 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
3339 val, DEFAULT_MAX_RDMA_SIZE);
3340 return -EINVAL;
3341 }
3342 sport->port_attrib.srp_max_rdma_size = val;
3343
3344 return count;
3345}
3346
3347static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,
3348 char *page)
3349{
3350 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3351 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3352
3353 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
3354}
3355
3356static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,
3357 const char *page, size_t count)
3358{
3359 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3360 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3361 unsigned long val;
3362 int ret;
3363
3364 ret = kstrtoul(page, 0, &val);
3365 if (ret < 0) {
3366 pr_err("kstrtoul() failed with ret: %d\n", ret);
3367 return -EINVAL;
3368 }
3369 if (val > MAX_SRPT_RSP_SIZE) {
3370 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
3371 MAX_SRPT_RSP_SIZE);
3372 return -EINVAL;
3373 }
3374 if (val < MIN_MAX_RSP_SIZE) {
3375 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
3376 MIN_MAX_RSP_SIZE);
3377 return -EINVAL;
3378 }
3379 sport->port_attrib.srp_max_rsp_size = val;
3380
3381 return count;
3382}
3383
3384static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,
3385 char *page)
3386{
3387 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3388 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3389
3390 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
3391}
3392
3393static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,
3394 const char *page, size_t count)
3395{
3396 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3397 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3398 unsigned long val;
3399 int ret;
3400
3401 ret = kstrtoul(page, 0, &val);
3402 if (ret < 0) {
3403 pr_err("kstrtoul() failed with ret: %d\n", ret);
3404 return -EINVAL;
3405 }
3406 if (val > MAX_SRPT_SRQ_SIZE) {
3407 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
3408 MAX_SRPT_SRQ_SIZE);
3409 return -EINVAL;
3410 }
3411 if (val < MIN_SRPT_SRQ_SIZE) {
3412 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
3413 MIN_SRPT_SRQ_SIZE);
3414 return -EINVAL;
3415 }
3416 sport->port_attrib.srp_sq_size = val;
3417
3418 return count;
3419}
3420
3421static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item,
3422 char *page)
3423{
3424 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3425 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3426
3427 return sprintf(page, "%d\n", sport->port_attrib.use_srq);
3428}
3429
3430static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item,
3431 const char *page, size_t count)
3432{
3433 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3434 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3435 struct srpt_device *sdev = sport->sdev;
3436 unsigned long val;
3437 bool enabled;
3438 int ret;
3439
3440 ret = kstrtoul(page, 0, &val);
3441 if (ret < 0)
3442 return ret;
3443 if (val != !!val)
3444 return -EINVAL;
3445
3446 ret = mutex_lock_interruptible(&sdev->sdev_mutex);
3447 if (ret < 0)
3448 return ret;
3449 ret = mutex_lock_interruptible(&sport->mutex);
3450 if (ret < 0)
3451 goto unlock_sdev;
3452 enabled = sport->enabled;
3453
3454 srpt_set_enabled(sport, false);
3455 sport->port_attrib.use_srq = val;
3456 srpt_use_srq(sdev, sport->port_attrib.use_srq);
3457 srpt_set_enabled(sport, enabled);
3458 ret = count;
3459 mutex_unlock(&sport->mutex);
3460unlock_sdev:
3461 mutex_unlock(&sdev->sdev_mutex);
3462
3463 return ret;
3464}
3465
3466CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);
3467CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);
3468CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);
3469CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq);
3470
3471static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
3472 &srpt_tpg_attrib_attr_srp_max_rdma_size,
3473 &srpt_tpg_attrib_attr_srp_max_rsp_size,
3474 &srpt_tpg_attrib_attr_srp_sq_size,
3475 &srpt_tpg_attrib_attr_use_srq,
3476 NULL,
3477};
3478
3479static struct rdma_cm_id *srpt_create_rdma_id(struct sockaddr *listen_addr)
3480{
3481 struct rdma_cm_id *rdma_cm_id;
3482 int ret;
3483
3484 rdma_cm_id = rdma_create_id(&init_net, srpt_rdma_cm_handler,
3485 NULL, RDMA_PS_TCP, IB_QPT_RC);
3486 if (IS_ERR(rdma_cm_id)) {
3487 pr_err("RDMA/CM ID creation failed: %ld\n",
3488 PTR_ERR(rdma_cm_id));
3489 goto out;
3490 }
3491
3492 ret = rdma_bind_addr(rdma_cm_id, listen_addr);
3493 if (ret) {
3494 char addr_str[64];
3495
3496 snprintf(addr_str, sizeof(addr_str), "%pISp", listen_addr);
3497 pr_err("Binding RDMA/CM ID to address %s failed: %d\n",
3498 addr_str, ret);
3499 rdma_destroy_id(rdma_cm_id);
3500 rdma_cm_id = ERR_PTR(ret);
3501 goto out;
3502 }
3503
3504 ret = rdma_listen(rdma_cm_id, 128);
3505 if (ret) {
3506 pr_err("rdma_listen() failed: %d\n", ret);
3507 rdma_destroy_id(rdma_cm_id);
3508 rdma_cm_id = ERR_PTR(ret);
3509 }
3510
3511out:
3512 return rdma_cm_id;
3513}
3514
3515static ssize_t srpt_rdma_cm_port_show(struct config_item *item, char *page)
3516{
3517 return sprintf(page, "%d\n", rdma_cm_port);
3518}
3519
3520static ssize_t srpt_rdma_cm_port_store(struct config_item *item,
3521 const char *page, size_t count)
3522{
3523 struct sockaddr_in addr4 = { .sin_family = AF_INET };
3524 struct sockaddr_in6 addr6 = { .sin6_family = AF_INET6 };
3525 struct rdma_cm_id *new_id = NULL;
3526 u16 val;
3527 int ret;
3528
3529 ret = kstrtou16(page, 0, &val);
3530 if (ret < 0)
3531 return ret;
3532 ret = count;
3533 if (rdma_cm_port == val)
3534 goto out;
3535
3536 if (val) {
3537 addr6.sin6_port = cpu_to_be16(val);
3538 new_id = srpt_create_rdma_id((struct sockaddr *)&addr6);
3539 if (IS_ERR(new_id)) {
3540 addr4.sin_port = cpu_to_be16(val);
3541 new_id = srpt_create_rdma_id((struct sockaddr *)&addr4);
3542 if (IS_ERR(new_id)) {
3543 ret = PTR_ERR(new_id);
3544 goto out;
3545 }
3546 }
3547 }
3548
3549 mutex_lock(&rdma_cm_mutex);
3550 rdma_cm_port = val;
3551 swap(rdma_cm_id, new_id);
3552 mutex_unlock(&rdma_cm_mutex);
3553
3554 if (new_id)
3555 rdma_destroy_id(new_id);
3556 ret = count;
3557out:
3558 return ret;
3559}
3560
3561CONFIGFS_ATTR(srpt_, rdma_cm_port);
3562
3563static struct configfs_attribute *srpt_da_attrs[] = {
3564 &srpt_attr_rdma_cm_port,
3565 NULL,
3566};
3567
3568static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page)
3569{
3570 struct se_portal_group *se_tpg = to_tpg(item);
3571 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3572
3573 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
3574}
3575
3576static ssize_t srpt_tpg_enable_store(struct config_item *item,
3577 const char *page, size_t count)
3578{
3579 struct se_portal_group *se_tpg = to_tpg(item);
3580 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3581 unsigned long tmp;
3582 int ret;
3583
3584 ret = kstrtoul(page, 0, &tmp);
3585 if (ret < 0) {
3586 pr_err("Unable to extract srpt_tpg_store_enable\n");
3587 return -EINVAL;
3588 }
3589
3590 if ((tmp != 0) && (tmp != 1)) {
3591 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
3592 return -EINVAL;
3593 }
3594
3595 mutex_lock(&sport->mutex);
3596 srpt_set_enabled(sport, tmp);
3597 mutex_unlock(&sport->mutex);
3598
3599 return count;
3600}
3601
3602CONFIGFS_ATTR(srpt_tpg_, enable);
3603
3604static struct configfs_attribute *srpt_tpg_attrs[] = {
3605 &srpt_tpg_attr_enable,
3606 NULL,
3607};
3608
3609
3610
3611
3612
3613
3614static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
3615 const char *name)
3616{
3617 struct srpt_port *sport = wwn->priv;
3618 static struct se_portal_group *tpg;
3619 int res;
3620
3621 WARN_ON_ONCE(wwn != &sport->port_guid_wwn &&
3622 wwn != &sport->port_gid_wwn);
3623 tpg = wwn == &sport->port_guid_wwn ? &sport->port_guid_tpg :
3624 &sport->port_gid_tpg;
3625 res = core_tpg_register(wwn, tpg, SCSI_PROTOCOL_SRP);
3626 if (res)
3627 return ERR_PTR(res);
3628
3629 return tpg;
3630}
3631
3632
3633
3634
3635
3636static void srpt_drop_tpg(struct se_portal_group *tpg)
3637{
3638 struct srpt_port *sport = srpt_tpg_to_sport(tpg);
3639
3640 sport->enabled = false;
3641 core_tpg_deregister(tpg);
3642}
3643
3644
3645
3646
3647
3648
3649
3650static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3651 struct config_group *group,
3652 const char *name)
3653{
3654 return srpt_lookup_wwn(name) ? : ERR_PTR(-EINVAL);
3655}
3656
3657
3658
3659
3660
3661static void srpt_drop_tport(struct se_wwn *wwn)
3662{
3663}
3664
3665static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)
3666{
3667 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3668}
3669
3670CONFIGFS_ATTR_RO(srpt_wwn_, version);
3671
3672static struct configfs_attribute *srpt_wwn_attrs[] = {
3673 &srpt_wwn_attr_version,
3674 NULL,
3675};
3676
3677static const struct target_core_fabric_ops srpt_template = {
3678 .module = THIS_MODULE,
3679 .name = "srpt",
3680 .get_fabric_name = srpt_get_fabric_name,
3681 .tpg_get_wwn = srpt_get_fabric_wwn,
3682 .tpg_get_tag = srpt_get_tag,
3683 .tpg_check_demo_mode = srpt_check_false,
3684 .tpg_check_demo_mode_cache = srpt_check_true,
3685 .tpg_check_demo_mode_write_protect = srpt_check_true,
3686 .tpg_check_prod_mode_write_protect = srpt_check_false,
3687 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3688 .release_cmd = srpt_release_cmd,
3689 .check_stop_free = srpt_check_stop_free,
3690 .close_session = srpt_close_session,
3691 .sess_get_index = srpt_sess_get_index,
3692 .sess_get_initiator_sid = NULL,
3693 .write_pending = srpt_write_pending,
3694 .write_pending_status = srpt_write_pending_status,
3695 .set_default_node_attributes = srpt_set_default_node_attrs,
3696 .get_cmd_state = srpt_get_tcm_cmd_state,
3697 .queue_data_in = srpt_queue_data_in,
3698 .queue_status = srpt_queue_status,
3699 .queue_tm_rsp = srpt_queue_tm_rsp,
3700 .aborted_task = srpt_aborted_task,
3701
3702
3703
3704
3705 .fabric_make_wwn = srpt_make_tport,
3706 .fabric_drop_wwn = srpt_drop_tport,
3707 .fabric_make_tpg = srpt_make_tpg,
3708 .fabric_drop_tpg = srpt_drop_tpg,
3709 .fabric_init_nodeacl = srpt_init_nodeacl,
3710
3711 .tfc_discovery_attrs = srpt_da_attrs,
3712 .tfc_wwn_attrs = srpt_wwn_attrs,
3713 .tfc_tpg_base_attrs = srpt_tpg_attrs,
3714 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
3715};
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725static int __init srpt_init_module(void)
3726{
3727 int ret;
3728
3729 ret = -EINVAL;
3730 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
3731 pr_err("invalid value %d for kernel module parameter"
3732 " srp_max_req_size -- must be at least %d.\n",
3733 srp_max_req_size, MIN_MAX_REQ_SIZE);
3734 goto out;
3735 }
3736
3737 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3738 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
3739 pr_err("invalid value %d for kernel module parameter"
3740 " srpt_srq_size -- must be in the range [%d..%d].\n",
3741 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3742 goto out;
3743 }
3744
3745 ret = target_register_template(&srpt_template);
3746 if (ret)
3747 goto out;
3748
3749 ret = ib_register_client(&srpt_client);
3750 if (ret) {
3751 pr_err("couldn't register IB client\n");
3752 goto out_unregister_target;
3753 }
3754
3755 return 0;
3756
3757out_unregister_target:
3758 target_unregister_template(&srpt_template);
3759out:
3760 return ret;
3761}
3762
3763static void __exit srpt_cleanup_module(void)
3764{
3765 if (rdma_cm_id)
3766 rdma_destroy_id(rdma_cm_id);
3767 ib_unregister_client(&srpt_client);
3768 target_unregister_template(&srpt_template);
3769}
3770
3771module_init(srpt_init_module);
3772module_exit(srpt_cleanup_module);
3773