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35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/string.h>
40#include <linux/parser.h>
41#include <linux/random.h>
42#include <linux/jiffies.h>
43
44#include <asm/atomic.h>
45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/srp.h>
50
51#include <rdma/ib_cache.h>
52
53#include "ib_srp.h"
54
55#define DRV_NAME "ib_srp"
56#define PFX DRV_NAME ": "
57#define DRV_VERSION "0.2"
58#define DRV_RELDATE "November 1, 2005"
59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
65static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
66static int srp_max_iu_len;
67
68module_param(srp_sg_tablesize, int, 0444);
69MODULE_PARM_DESC(srp_sg_tablesize,
70 "Max number of gather/scatter entries per I/O (default is 12)");
71
72static int topspin_workarounds = 1;
73
74module_param(topspin_workarounds, int, 0444);
75MODULE_PARM_DESC(topspin_workarounds,
76 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
77
78static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
79
80static int mellanox_workarounds = 1;
81
82module_param(mellanox_workarounds, int, 0444);
83MODULE_PARM_DESC(mellanox_workarounds,
84 "Enable workarounds for Mellanox SRP target bugs if != 0");
85
86static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
87
88static void srp_add_one(struct ib_device *device);
89static void srp_remove_one(struct ib_device *device);
90static void srp_completion(struct ib_cq *cq, void *target_ptr);
91static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
92
93static struct ib_client srp_client = {
94 .name = "srp",
95 .add = srp_add_one,
96 .remove = srp_remove_one
97};
98
99static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
100{
101 return (struct srp_target_port *) host->hostdata;
102}
103
104static const char *srp_target_info(struct Scsi_Host *host)
105{
106 return host_to_target(host)->target_name;
107}
108
109static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
110 gfp_t gfp_mask,
111 enum dma_data_direction direction)
112{
113 struct srp_iu *iu;
114
115 iu = kmalloc(sizeof *iu, gfp_mask);
116 if (!iu)
117 goto out;
118
119 iu->buf = kzalloc(size, gfp_mask);
120 if (!iu->buf)
121 goto out_free_iu;
122
123 iu->dma = dma_map_single(host->dev->dev->dma_device,
124 iu->buf, size, direction);
125 if (dma_mapping_error(iu->dma))
126 goto out_free_buf;
127
128 iu->size = size;
129 iu->direction = direction;
130
131 return iu;
132
133out_free_buf:
134 kfree(iu->buf);
135out_free_iu:
136 kfree(iu);
137out:
138 return NULL;
139}
140
141static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
142{
143 if (!iu)
144 return;
145
146 dma_unmap_single(host->dev->dev->dma_device,
147 iu->dma, iu->size, iu->direction);
148 kfree(iu->buf);
149 kfree(iu);
150}
151
152static void srp_qp_event(struct ib_event *event, void *context)
153{
154 printk(KERN_ERR PFX "QP event %d\n", event->event);
155}
156
157static int srp_init_qp(struct srp_target_port *target,
158 struct ib_qp *qp)
159{
160 struct ib_qp_attr *attr;
161 int ret;
162
163 attr = kmalloc(sizeof *attr, GFP_KERNEL);
164 if (!attr)
165 return -ENOMEM;
166
167 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
168 target->srp_host->port,
169 be16_to_cpu(target->path.pkey),
170 &attr->pkey_index);
171 if (ret)
172 goto out;
173
174 attr->qp_state = IB_QPS_INIT;
175 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
176 IB_ACCESS_REMOTE_WRITE);
177 attr->port_num = target->srp_host->port;
178
179 ret = ib_modify_qp(qp, attr,
180 IB_QP_STATE |
181 IB_QP_PKEY_INDEX |
182 IB_QP_ACCESS_FLAGS |
183 IB_QP_PORT);
184
185out:
186 kfree(attr);
187 return ret;
188}
189
190static int srp_create_target_ib(struct srp_target_port *target)
191{
192 struct ib_qp_init_attr *init_attr;
193 int ret;
194
195 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
196 if (!init_attr)
197 return -ENOMEM;
198
199 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
200 NULL, target, SRP_CQ_SIZE);
201 if (IS_ERR(target->cq)) {
202 ret = PTR_ERR(target->cq);
203 goto out;
204 }
205
206 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
207
208 init_attr->event_handler = srp_qp_event;
209 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
210 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
211 init_attr->cap.max_recv_sge = 1;
212 init_attr->cap.max_send_sge = 1;
213 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
214 init_attr->qp_type = IB_QPT_RC;
215 init_attr->send_cq = target->cq;
216 init_attr->recv_cq = target->cq;
217
218 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
219 if (IS_ERR(target->qp)) {
220 ret = PTR_ERR(target->qp);
221 ib_destroy_cq(target->cq);
222 goto out;
223 }
224
225 ret = srp_init_qp(target, target->qp);
226 if (ret) {
227 ib_destroy_qp(target->qp);
228 ib_destroy_cq(target->cq);
229 goto out;
230 }
231
232out:
233 kfree(init_attr);
234 return ret;
235}
236
237static void srp_free_target_ib(struct srp_target_port *target)
238{
239 int i;
240
241 ib_destroy_qp(target->qp);
242 ib_destroy_cq(target->cq);
243
244 for (i = 0; i < SRP_RQ_SIZE; ++i)
245 srp_free_iu(target->srp_host, target->rx_ring[i]);
246 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
247 srp_free_iu(target->srp_host, target->tx_ring[i]);
248}
249
250static void srp_path_rec_completion(int status,
251 struct ib_sa_path_rec *pathrec,
252 void *target_ptr)
253{
254 struct srp_target_port *target = target_ptr;
255
256 target->status = status;
257 if (status)
258 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
259 else
260 target->path = *pathrec;
261 complete(&target->done);
262}
263
264static int srp_lookup_path(struct srp_target_port *target)
265{
266 target->path.numb_path = 1;
267
268 init_completion(&target->done);
269
270 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev->dev,
271 target->srp_host->port,
272 &target->path,
273 IB_SA_PATH_REC_DGID |
274 IB_SA_PATH_REC_SGID |
275 IB_SA_PATH_REC_NUMB_PATH |
276 IB_SA_PATH_REC_PKEY,
277 SRP_PATH_REC_TIMEOUT_MS,
278 GFP_KERNEL,
279 srp_path_rec_completion,
280 target, &target->path_query);
281 if (target->path_query_id < 0)
282 return target->path_query_id;
283
284 wait_for_completion(&target->done);
285
286 if (target->status < 0)
287 printk(KERN_WARNING PFX "Path record query failed\n");
288
289 return target->status;
290}
291
292static int srp_send_req(struct srp_target_port *target)
293{
294 struct {
295 struct ib_cm_req_param param;
296 struct srp_login_req priv;
297 } *req = NULL;
298 int status;
299
300 req = kzalloc(sizeof *req, GFP_KERNEL);
301 if (!req)
302 return -ENOMEM;
303
304 req->param.primary_path = &target->path;
305 req->param.alternate_path = NULL;
306 req->param.service_id = target->service_id;
307 req->param.qp_num = target->qp->qp_num;
308 req->param.qp_type = target->qp->qp_type;
309 req->param.private_data = &req->priv;
310 req->param.private_data_len = sizeof req->priv;
311 req->param.flow_control = 1;
312
313 get_random_bytes(&req->param.starting_psn, 4);
314 req->param.starting_psn &= 0xffffff;
315
316
317
318
319
320 req->param.responder_resources = 4;
321 req->param.remote_cm_response_timeout = 20;
322 req->param.local_cm_response_timeout = 20;
323 req->param.retry_count = 7;
324 req->param.rnr_retry_count = 7;
325 req->param.max_cm_retries = 15;
326
327 req->priv.opcode = SRP_LOGIN_REQ;
328 req->priv.tag = 0;
329 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
330 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
331 SRP_BUF_FORMAT_INDIRECT);
332
333
334
335
336
337
338
339
340
341 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
342 memcpy(req->priv.initiator_port_id,
343 target->srp_host->initiator_port_id + 8, 8);
344 memcpy(req->priv.initiator_port_id + 8,
345 target->srp_host->initiator_port_id, 8);
346 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
347 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
348 } else {
349 memcpy(req->priv.initiator_port_id,
350 target->srp_host->initiator_port_id, 16);
351 memcpy(req->priv.target_port_id, &target->id_ext, 8);
352 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
353 }
354
355
356
357
358
359
360
361 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
362 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
363 "activated for target GUID %016llx\n",
364 (unsigned long long) be64_to_cpu(target->ioc_guid));
365 memset(req->priv.initiator_port_id, 0, 8);
366 }
367
368 status = ib_send_cm_req(target->cm_id, &req->param);
369
370 kfree(req);
371
372 return status;
373}
374
375static void srp_disconnect_target(struct srp_target_port *target)
376{
377
378
379 init_completion(&target->done);
380 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
381 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
382 return;
383 }
384 wait_for_completion(&target->done);
385}
386
387static void srp_remove_work(void *target_ptr)
388{
389 struct srp_target_port *target = target_ptr;
390
391 spin_lock_irq(target->scsi_host->host_lock);
392 if (target->state != SRP_TARGET_DEAD) {
393 spin_unlock_irq(target->scsi_host->host_lock);
394 return;
395 }
396 target->state = SRP_TARGET_REMOVED;
397 spin_unlock_irq(target->scsi_host->host_lock);
398
399 spin_lock(&target->srp_host->target_lock);
400 list_del(&target->list);
401 spin_unlock(&target->srp_host->target_lock);
402
403 scsi_remove_host(target->scsi_host);
404 ib_destroy_cm_id(target->cm_id);
405 srp_free_target_ib(target);
406 scsi_host_put(target->scsi_host);
407}
408
409static int srp_connect_target(struct srp_target_port *target)
410{
411 int ret;
412
413 ret = srp_lookup_path(target);
414 if (ret)
415 return ret;
416
417 while (1) {
418 init_completion(&target->done);
419 ret = srp_send_req(target);
420 if (ret)
421 return ret;
422 wait_for_completion(&target->done);
423
424
425
426
427
428
429
430 switch (target->status) {
431 case 0:
432 return 0;
433
434 case SRP_PORT_REDIRECT:
435 ret = srp_lookup_path(target);
436 if (ret)
437 return ret;
438 break;
439
440 case SRP_DLID_REDIRECT:
441 break;
442
443 default:
444 return target->status;
445 }
446 }
447}
448
449static void srp_unmap_data(struct scsi_cmnd *scmnd,
450 struct srp_target_port *target,
451 struct srp_request *req)
452{
453 struct scatterlist *scat;
454 int nents;
455
456 if (!scmnd->request_buffer ||
457 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
458 scmnd->sc_data_direction != DMA_FROM_DEVICE))
459 return;
460
461 if (req->fmr) {
462 ib_fmr_pool_unmap(req->fmr);
463 req->fmr = NULL;
464 }
465
466
467
468
469
470 if (likely(scmnd->use_sg)) {
471 nents = scmnd->use_sg;
472 scat = scmnd->request_buffer;
473 } else {
474 nents = 1;
475 scat = &req->fake_sg;
476 }
477
478 dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
479 scmnd->sc_data_direction);
480}
481
482static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
483{
484 srp_unmap_data(req->scmnd, target, req);
485 list_move_tail(&req->list, &target->free_reqs);
486}
487
488static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
489{
490 req->scmnd->result = DID_RESET << 16;
491 req->scmnd->scsi_done(req->scmnd);
492 srp_remove_req(target, req);
493}
494
495static int srp_reconnect_target(struct srp_target_port *target)
496{
497 struct ib_cm_id *new_cm_id;
498 struct ib_qp_attr qp_attr;
499 struct srp_request *req, *tmp;
500 struct ib_wc wc;
501 int ret;
502
503 spin_lock_irq(target->scsi_host->host_lock);
504 if (target->state != SRP_TARGET_LIVE) {
505 spin_unlock_irq(target->scsi_host->host_lock);
506 return -EAGAIN;
507 }
508 target->state = SRP_TARGET_CONNECTING;
509 spin_unlock_irq(target->scsi_host->host_lock);
510
511 srp_disconnect_target(target);
512
513
514
515
516 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
517 srp_cm_handler, target);
518 if (IS_ERR(new_cm_id)) {
519 ret = PTR_ERR(new_cm_id);
520 goto err;
521 }
522 ib_destroy_cm_id(target->cm_id);
523 target->cm_id = new_cm_id;
524
525 qp_attr.qp_state = IB_QPS_RESET;
526 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
527 if (ret)
528 goto err;
529
530 ret = srp_init_qp(target, target->qp);
531 if (ret)
532 goto err;
533
534 while (ib_poll_cq(target->cq, 1, &wc) > 0)
535 ;
536
537 spin_lock_irq(target->scsi_host->host_lock);
538 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
539 srp_reset_req(target, req);
540 spin_unlock_irq(target->scsi_host->host_lock);
541
542 target->rx_head = 0;
543 target->tx_head = 0;
544 target->tx_tail = 0;
545
546 ret = srp_connect_target(target);
547 if (ret)
548 goto err;
549
550 spin_lock_irq(target->scsi_host->host_lock);
551 if (target->state == SRP_TARGET_CONNECTING) {
552 ret = 0;
553 target->state = SRP_TARGET_LIVE;
554 } else
555 ret = -EAGAIN;
556 spin_unlock_irq(target->scsi_host->host_lock);
557
558 return ret;
559
560err:
561 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
562
563
564
565
566
567
568
569 spin_lock_irq(target->scsi_host->host_lock);
570 if (target->state == SRP_TARGET_CONNECTING) {
571 target->state = SRP_TARGET_DEAD;
572 INIT_WORK(&target->work, srp_remove_work, target);
573 schedule_work(&target->work);
574 }
575 spin_unlock_irq(target->scsi_host->host_lock);
576
577 return ret;
578}
579
580static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
581 int sg_cnt, struct srp_request *req,
582 struct srp_direct_buf *buf)
583{
584 u64 io_addr = 0;
585 u64 *dma_pages;
586 u32 len;
587 int page_cnt;
588 int i, j;
589 int ret;
590 struct srp_device *dev = target->srp_host->dev;
591
592 if (!dev->fmr_pool)
593 return -ENODEV;
594
595 if ((sg_dma_address(&scat[0]) & ~dev->fmr_page_mask) &&
596 mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3))
597 return -EINVAL;
598
599 len = page_cnt = 0;
600 for (i = 0; i < sg_cnt; ++i) {
601 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
602 if (i > 0)
603 return -EINVAL;
604 else
605 ++page_cnt;
606 }
607 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
608 ~dev->fmr_page_mask) {
609 if (i < sg_cnt - 1)
610 return -EINVAL;
611 else
612 ++page_cnt;
613 }
614
615 len += sg_dma_len(&scat[i]);
616 }
617
618 page_cnt += len >> dev->fmr_page_shift;
619 if (page_cnt > SRP_FMR_SIZE)
620 return -ENOMEM;
621
622 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
623 if (!dma_pages)
624 return -ENOMEM;
625
626 page_cnt = 0;
627 for (i = 0; i < sg_cnt; ++i)
628 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
629 dma_pages[page_cnt++] =
630 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
631
632 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
633 dma_pages, page_cnt, io_addr);
634 if (IS_ERR(req->fmr)) {
635 ret = PTR_ERR(req->fmr);
636 req->fmr = NULL;
637 goto out;
638 }
639
640 buf->va = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
641 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
642 buf->len = cpu_to_be32(len);
643
644 ret = 0;
645
646out:
647 kfree(dma_pages);
648
649 return ret;
650}
651
652static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
653 struct srp_request *req)
654{
655 struct scatterlist *scat;
656 struct srp_cmd *cmd = req->cmd->buf;
657 int len, nents, count;
658 u8 fmt = SRP_DATA_DESC_DIRECT;
659
660 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
661 return sizeof (struct srp_cmd);
662
663 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
664 scmnd->sc_data_direction != DMA_TO_DEVICE) {
665 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
666 scmnd->sc_data_direction);
667 return -EINVAL;
668 }
669
670
671
672
673
674 if (likely(scmnd->use_sg)) {
675 nents = scmnd->use_sg;
676 scat = scmnd->request_buffer;
677 } else {
678 nents = 1;
679 scat = &req->fake_sg;
680 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
681 }
682
683 count = dma_map_sg(target->srp_host->dev->dev->dma_device,
684 scat, nents, scmnd->sc_data_direction);
685
686 fmt = SRP_DATA_DESC_DIRECT;
687 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
688
689 if (count == 1) {
690
691
692
693
694
695
696 struct srp_direct_buf *buf = (void *) cmd->add_data;
697
698 buf->va = cpu_to_be64(sg_dma_address(scat));
699 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
700 buf->len = cpu_to_be32(sg_dma_len(scat));
701 } else if (srp_map_fmr(target, scat, count, req,
702 (void *) cmd->add_data)) {
703
704
705
706
707
708 struct srp_indirect_buf *buf = (void *) cmd->add_data;
709 u32 datalen = 0;
710 int i;
711
712 fmt = SRP_DATA_DESC_INDIRECT;
713 len = sizeof (struct srp_cmd) +
714 sizeof (struct srp_indirect_buf) +
715 count * sizeof (struct srp_direct_buf);
716
717 for (i = 0; i < count; ++i) {
718 buf->desc_list[i].va =
719 cpu_to_be64(sg_dma_address(&scat[i]));
720 buf->desc_list[i].key =
721 cpu_to_be32(target->srp_host->dev->mr->rkey);
722 buf->desc_list[i].len =
723 cpu_to_be32(sg_dma_len(&scat[i]));
724 datalen += sg_dma_len(&scat[i]);
725 }
726
727 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
728 cmd->data_out_desc_cnt = count;
729 else
730 cmd->data_in_desc_cnt = count;
731
732 buf->table_desc.va =
733 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
734 buf->table_desc.key =
735 cpu_to_be32(target->srp_host->dev->mr->rkey);
736 buf->table_desc.len =
737 cpu_to_be32(count * sizeof (struct srp_direct_buf));
738
739 buf->len = cpu_to_be32(datalen);
740 }
741
742 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
743 cmd->buf_fmt = fmt << 4;
744 else
745 cmd->buf_fmt = fmt;
746
747 return len;
748}
749
750static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
751{
752 struct srp_request *req;
753 struct scsi_cmnd *scmnd;
754 unsigned long flags;
755 s32 delta;
756
757 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
758
759 spin_lock_irqsave(target->scsi_host->host_lock, flags);
760
761 target->req_lim += delta;
762
763 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
764
765 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
766 if (be32_to_cpu(rsp->resp_data_len) < 4)
767 req->tsk_status = -1;
768 else
769 req->tsk_status = rsp->data[3];
770 complete(&req->done);
771 } else {
772 scmnd = req->scmnd;
773 if (!scmnd)
774 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
775 (unsigned long long) rsp->tag);
776 scmnd->result = rsp->status;
777
778 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
779 memcpy(scmnd->sense_buffer, rsp->data +
780 be32_to_cpu(rsp->resp_data_len),
781 min_t(int, be32_to_cpu(rsp->sense_data_len),
782 SCSI_SENSE_BUFFERSIZE));
783 }
784
785 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
786 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
787 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
788 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
789
790 if (!req->tsk_mgmt) {
791 scmnd->host_scribble = (void *) -1L;
792 scmnd->scsi_done(scmnd);
793
794 srp_remove_req(target, req);
795 } else
796 req->cmd_done = 1;
797 }
798
799 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
800}
801
802static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
803{
804 struct srp_iu *iu;
805 u8 opcode;
806
807 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
808
809 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
810 target->max_ti_iu_len, DMA_FROM_DEVICE);
811
812 opcode = *(u8 *) iu->buf;
813
814 if (0) {
815 int i;
816
817 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
818
819 for (i = 0; i < wc->byte_len; ++i) {
820 if (i % 8 == 0)
821 printk(KERN_ERR " [%02x] ", i);
822 printk(" %02x", ((u8 *) iu->buf)[i]);
823 if ((i + 1) % 8 == 0)
824 printk("\n");
825 }
826
827 if (wc->byte_len % 8)
828 printk("\n");
829 }
830
831 switch (opcode) {
832 case SRP_RSP:
833 srp_process_rsp(target, iu->buf);
834 break;
835
836 case SRP_T_LOGOUT:
837
838 printk(KERN_WARNING PFX "Got target logout request\n");
839 break;
840
841 default:
842 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
843 break;
844 }
845
846 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
847 target->max_ti_iu_len, DMA_FROM_DEVICE);
848}
849
850static void srp_completion(struct ib_cq *cq, void *target_ptr)
851{
852 struct srp_target_port *target = target_ptr;
853 struct ib_wc wc;
854
855 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
856 while (ib_poll_cq(cq, 1, &wc) > 0) {
857 if (wc.status) {
858 printk(KERN_ERR PFX "failed %s status %d\n",
859 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
860 wc.status);
861 break;
862 }
863
864 if (wc.wr_id & SRP_OP_RECV)
865 srp_handle_recv(target, &wc);
866 else
867 ++target->tx_tail;
868 }
869}
870
871static int __srp_post_recv(struct srp_target_port *target)
872{
873 struct srp_iu *iu;
874 struct ib_sge list;
875 struct ib_recv_wr wr, *bad_wr;
876 unsigned int next;
877 int ret;
878
879 next = target->rx_head & (SRP_RQ_SIZE - 1);
880 wr.wr_id = next | SRP_OP_RECV;
881 iu = target->rx_ring[next];
882
883 list.addr = iu->dma;
884 list.length = iu->size;
885 list.lkey = target->srp_host->dev->mr->lkey;
886
887 wr.next = NULL;
888 wr.sg_list = &list;
889 wr.num_sge = 1;
890
891 ret = ib_post_recv(target->qp, &wr, &bad_wr);
892 if (!ret)
893 ++target->rx_head;
894
895 return ret;
896}
897
898static int srp_post_recv(struct srp_target_port *target)
899{
900 unsigned long flags;
901 int ret;
902
903 spin_lock_irqsave(target->scsi_host->host_lock, flags);
904 ret = __srp_post_recv(target);
905 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
906
907 return ret;
908}
909
910
911
912
913
914
915static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
916{
917 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
918 return NULL;
919
920 if (unlikely(target->req_lim < 1))
921 ++target->zero_req_lim;
922
923 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
924}
925
926
927
928
929
930static int __srp_post_send(struct srp_target_port *target,
931 struct srp_iu *iu, int len)
932{
933 struct ib_sge list;
934 struct ib_send_wr wr, *bad_wr;
935 int ret = 0;
936
937 list.addr = iu->dma;
938 list.length = len;
939 list.lkey = target->srp_host->dev->mr->lkey;
940
941 wr.next = NULL;
942 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
943 wr.sg_list = &list;
944 wr.num_sge = 1;
945 wr.opcode = IB_WR_SEND;
946 wr.send_flags = IB_SEND_SIGNALED;
947
948 ret = ib_post_send(target->qp, &wr, &bad_wr);
949
950 if (!ret) {
951 ++target->tx_head;
952 --target->req_lim;
953 }
954
955 return ret;
956}
957
958static int srp_queuecommand(struct scsi_cmnd *scmnd,
959 void (*done)(struct scsi_cmnd *))
960{
961 struct srp_target_port *target = host_to_target(scmnd->device->host);
962 struct srp_request *req;
963 struct srp_iu *iu;
964 struct srp_cmd *cmd;
965 int len;
966
967 if (target->state == SRP_TARGET_CONNECTING)
968 goto err;
969
970 if (target->state == SRP_TARGET_DEAD ||
971 target->state == SRP_TARGET_REMOVED) {
972 scmnd->result = DID_BAD_TARGET << 16;
973 done(scmnd);
974 return 0;
975 }
976
977 iu = __srp_get_tx_iu(target);
978 if (!iu)
979 goto err;
980
981 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
982 srp_max_iu_len, DMA_TO_DEVICE);
983
984 req = list_entry(target->free_reqs.next, struct srp_request, list);
985
986 scmnd->scsi_done = done;
987 scmnd->result = 0;
988 scmnd->host_scribble = (void *) (long) req->index;
989
990 cmd = iu->buf;
991 memset(cmd, 0, sizeof *cmd);
992
993 cmd->opcode = SRP_CMD;
994 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
995 cmd->tag = req->index;
996 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
997
998 req->scmnd = scmnd;
999 req->cmd = iu;
1000 req->cmd_done = 0;
1001 req->tsk_mgmt = NULL;
1002
1003 len = srp_map_data(scmnd, target, req);
1004 if (len < 0) {
1005 printk(KERN_ERR PFX "Failed to map data\n");
1006 goto err;
1007 }
1008
1009 if (__srp_post_recv(target)) {
1010 printk(KERN_ERR PFX "Recv failed\n");
1011 goto err_unmap;
1012 }
1013
1014 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
1015 srp_max_iu_len, DMA_TO_DEVICE);
1016
1017 if (__srp_post_send(target, iu, len)) {
1018 printk(KERN_ERR PFX "Send failed\n");
1019 goto err_unmap;
1020 }
1021
1022 list_move_tail(&req->list, &target->req_queue);
1023
1024 return 0;
1025
1026err_unmap:
1027 srp_unmap_data(scmnd, target, req);
1028
1029err:
1030 return SCSI_MLQUEUE_HOST_BUSY;
1031}
1032
1033static int srp_alloc_iu_bufs(struct srp_target_port *target)
1034{
1035 int i;
1036
1037 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1038 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1039 target->max_ti_iu_len,
1040 GFP_KERNEL, DMA_FROM_DEVICE);
1041 if (!target->rx_ring[i])
1042 goto err;
1043 }
1044
1045 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1046 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1047 srp_max_iu_len,
1048 GFP_KERNEL, DMA_TO_DEVICE);
1049 if (!target->tx_ring[i])
1050 goto err;
1051 }
1052
1053 return 0;
1054
1055err:
1056 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1057 srp_free_iu(target->srp_host, target->rx_ring[i]);
1058 target->rx_ring[i] = NULL;
1059 }
1060
1061 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1062 srp_free_iu(target->srp_host, target->tx_ring[i]);
1063 target->tx_ring[i] = NULL;
1064 }
1065
1066 return -ENOMEM;
1067}
1068
1069static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1070 struct ib_cm_event *event,
1071 struct srp_target_port *target)
1072{
1073 struct ib_class_port_info *cpi;
1074 int opcode;
1075
1076 switch (event->param.rej_rcvd.reason) {
1077 case IB_CM_REJ_PORT_CM_REDIRECT:
1078 cpi = event->param.rej_rcvd.ari;
1079 target->path.dlid = cpi->redirect_lid;
1080 target->path.pkey = cpi->redirect_pkey;
1081 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1082 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1083
1084 target->status = target->path.dlid ?
1085 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1086 break;
1087
1088 case IB_CM_REJ_PORT_REDIRECT:
1089 if (topspin_workarounds &&
1090 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1091
1092
1093
1094
1095
1096 memcpy(target->path.dgid.raw,
1097 event->param.rej_rcvd.ari, 16);
1098
1099 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1100 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1101 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1102
1103 target->status = SRP_PORT_REDIRECT;
1104 } else {
1105 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1106 target->status = -ECONNRESET;
1107 }
1108 break;
1109
1110 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1111 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1112 target->status = -ECONNRESET;
1113 break;
1114
1115 case IB_CM_REJ_CONSUMER_DEFINED:
1116 opcode = *(u8 *) event->private_data;
1117 if (opcode == SRP_LOGIN_REJ) {
1118 struct srp_login_rej *rej = event->private_data;
1119 u32 reason = be32_to_cpu(rej->reason);
1120
1121 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1122 printk(KERN_WARNING PFX
1123 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1124 else
1125 printk(KERN_WARNING PFX
1126 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1127 } else
1128 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1129 " opcode 0x%02x\n", opcode);
1130 target->status = -ECONNRESET;
1131 break;
1132
1133 default:
1134 printk(KERN_WARNING " REJ reason 0x%x\n",
1135 event->param.rej_rcvd.reason);
1136 target->status = -ECONNRESET;
1137 }
1138}
1139
1140static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1141{
1142 struct srp_target_port *target = cm_id->context;
1143 struct ib_qp_attr *qp_attr = NULL;
1144 int attr_mask = 0;
1145 int comp = 0;
1146 int opcode = 0;
1147
1148 switch (event->event) {
1149 case IB_CM_REQ_ERROR:
1150 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1151 comp = 1;
1152 target->status = -ECONNRESET;
1153 break;
1154
1155 case IB_CM_REP_RECEIVED:
1156 comp = 1;
1157 opcode = *(u8 *) event->private_data;
1158
1159 if (opcode == SRP_LOGIN_RSP) {
1160 struct srp_login_rsp *rsp = event->private_data;
1161
1162 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1163 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1164
1165 target->scsi_host->can_queue = min(target->req_lim,
1166 target->scsi_host->can_queue);
1167 } else {
1168 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1169 target->status = -ECONNRESET;
1170 break;
1171 }
1172
1173 target->status = srp_alloc_iu_bufs(target);
1174 if (target->status)
1175 break;
1176
1177 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1178 if (!qp_attr) {
1179 target->status = -ENOMEM;
1180 break;
1181 }
1182
1183 qp_attr->qp_state = IB_QPS_RTR;
1184 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1185 if (target->status)
1186 break;
1187
1188 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1189 if (target->status)
1190 break;
1191
1192 target->status = srp_post_recv(target);
1193 if (target->status)
1194 break;
1195
1196 qp_attr->qp_state = IB_QPS_RTS;
1197 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1198 if (target->status)
1199 break;
1200
1201 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1202 if (target->status)
1203 break;
1204
1205 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1206 if (target->status)
1207 break;
1208
1209 break;
1210
1211 case IB_CM_REJ_RECEIVED:
1212 printk(KERN_DEBUG PFX "REJ received\n");
1213 comp = 1;
1214
1215 srp_cm_rej_handler(cm_id, event, target);
1216 break;
1217
1218 case IB_CM_DREQ_RECEIVED:
1219 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1220 if (ib_send_cm_drep(cm_id, NULL, 0))
1221 printk(KERN_ERR PFX "Sending CM DREP failed\n");
1222 break;
1223
1224 case IB_CM_TIMEWAIT_EXIT:
1225 printk(KERN_ERR PFX "connection closed\n");
1226
1227 comp = 1;
1228 target->status = 0;
1229 break;
1230
1231 case IB_CM_MRA_RECEIVED:
1232 case IB_CM_DREQ_ERROR:
1233 case IB_CM_DREP_RECEIVED:
1234 break;
1235
1236 default:
1237 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1238 break;
1239 }
1240
1241 if (comp)
1242 complete(&target->done);
1243
1244 kfree(qp_attr);
1245
1246 return 0;
1247}
1248
1249static int srp_send_tsk_mgmt(struct srp_target_port *target,
1250 struct srp_request *req, u8 func)
1251{
1252 struct srp_iu *iu;
1253 struct srp_tsk_mgmt *tsk_mgmt;
1254
1255 spin_lock_irq(target->scsi_host->host_lock);
1256
1257 if (target->state == SRP_TARGET_DEAD ||
1258 target->state == SRP_TARGET_REMOVED) {
1259 req->scmnd->result = DID_BAD_TARGET << 16;
1260 goto out;
1261 }
1262
1263 init_completion(&req->done);
1264
1265 iu = __srp_get_tx_iu(target);
1266 if (!iu)
1267 goto out;
1268
1269 tsk_mgmt = iu->buf;
1270 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1271
1272 tsk_mgmt->opcode = SRP_TSK_MGMT;
1273 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1274 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1275 tsk_mgmt->tsk_mgmt_func = func;
1276 tsk_mgmt->task_tag = req->index;
1277
1278 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1279 goto out;
1280
1281 req->tsk_mgmt = iu;
1282
1283 spin_unlock_irq(target->scsi_host->host_lock);
1284
1285 if (!wait_for_completion_timeout(&req->done,
1286 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1287 return -1;
1288
1289 return 0;
1290
1291out:
1292 spin_unlock_irq(target->scsi_host->host_lock);
1293 return -1;
1294}
1295
1296static int srp_find_req(struct srp_target_port *target,
1297 struct scsi_cmnd *scmnd,
1298 struct srp_request **req)
1299{
1300 if (scmnd->host_scribble == (void *) -1L)
1301 return -1;
1302
1303 *req = &target->req_ring[(long) scmnd->host_scribble];
1304
1305 return 0;
1306}
1307
1308static int srp_abort(struct scsi_cmnd *scmnd)
1309{
1310 struct srp_target_port *target = host_to_target(scmnd->device->host);
1311 struct srp_request *req;
1312 int ret = SUCCESS;
1313
1314 printk(KERN_ERR "SRP abort called\n");
1315
1316 if (srp_find_req(target, scmnd, &req))
1317 return FAILED;
1318 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1319 return FAILED;
1320
1321 spin_lock_irq(target->scsi_host->host_lock);
1322
1323 if (req->cmd_done) {
1324 srp_remove_req(target, req);
1325 scmnd->scsi_done(scmnd);
1326 } else if (!req->tsk_status) {
1327 srp_remove_req(target, req);
1328 scmnd->result = DID_ABORT << 16;
1329 } else
1330 ret = FAILED;
1331
1332 spin_unlock_irq(target->scsi_host->host_lock);
1333
1334 return ret;
1335}
1336
1337static int srp_reset_device(struct scsi_cmnd *scmnd)
1338{
1339 struct srp_target_port *target = host_to_target(scmnd->device->host);
1340 struct srp_request *req, *tmp;
1341
1342 printk(KERN_ERR "SRP reset_device called\n");
1343
1344 if (srp_find_req(target, scmnd, &req))
1345 return FAILED;
1346 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1347 return FAILED;
1348 if (req->tsk_status)
1349 return FAILED;
1350
1351 spin_lock_irq(target->scsi_host->host_lock);
1352
1353 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1354 if (req->scmnd->device == scmnd->device)
1355 srp_reset_req(target, req);
1356
1357 spin_unlock_irq(target->scsi_host->host_lock);
1358
1359 return SUCCESS;
1360}
1361
1362static int srp_reset_host(struct scsi_cmnd *scmnd)
1363{
1364 struct srp_target_port *target = host_to_target(scmnd->device->host);
1365 int ret = FAILED;
1366
1367 printk(KERN_ERR PFX "SRP reset_host called\n");
1368
1369 if (!srp_reconnect_target(target))
1370 ret = SUCCESS;
1371
1372 return ret;
1373}
1374
1375static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1376{
1377 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1378
1379 if (target->state == SRP_TARGET_DEAD ||
1380 target->state == SRP_TARGET_REMOVED)
1381 return -ENODEV;
1382
1383 return sprintf(buf, "0x%016llx\n",
1384 (unsigned long long) be64_to_cpu(target->id_ext));
1385}
1386
1387static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1388{
1389 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1390
1391 if (target->state == SRP_TARGET_DEAD ||
1392 target->state == SRP_TARGET_REMOVED)
1393 return -ENODEV;
1394
1395 return sprintf(buf, "0x%016llx\n",
1396 (unsigned long long) be64_to_cpu(target->ioc_guid));
1397}
1398
1399static ssize_t show_service_id(struct class_device *cdev, char *buf)
1400{
1401 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1402
1403 if (target->state == SRP_TARGET_DEAD ||
1404 target->state == SRP_TARGET_REMOVED)
1405 return -ENODEV;
1406
1407 return sprintf(buf, "0x%016llx\n",
1408 (unsigned long long) be64_to_cpu(target->service_id));
1409}
1410
1411static ssize_t show_pkey(struct class_device *cdev, char *buf)
1412{
1413 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1414
1415 if (target->state == SRP_TARGET_DEAD ||
1416 target->state == SRP_TARGET_REMOVED)
1417 return -ENODEV;
1418
1419 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1420}
1421
1422static ssize_t show_dgid(struct class_device *cdev, char *buf)
1423{
1424 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1425
1426 if (target->state == SRP_TARGET_DEAD ||
1427 target->state == SRP_TARGET_REMOVED)
1428 return -ENODEV;
1429
1430 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1431 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1432 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1433 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1434 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1435 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1436 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1437 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1438 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1439}
1440
1441static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1442{
1443 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1444
1445 if (target->state == SRP_TARGET_DEAD ||
1446 target->state == SRP_TARGET_REMOVED)
1447 return -ENODEV;
1448
1449 return sprintf(buf, "%d\n", target->zero_req_lim);
1450}
1451
1452static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1453static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1454static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1455static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1456static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1457static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1458
1459static struct class_device_attribute *srp_host_attrs[] = {
1460 &class_device_attr_id_ext,
1461 &class_device_attr_ioc_guid,
1462 &class_device_attr_service_id,
1463 &class_device_attr_pkey,
1464 &class_device_attr_dgid,
1465 &class_device_attr_zero_req_lim,
1466 NULL
1467};
1468
1469static struct scsi_host_template srp_template = {
1470 .module = THIS_MODULE,
1471 .name = DRV_NAME,
1472 .info = srp_target_info,
1473 .queuecommand = srp_queuecommand,
1474 .eh_abort_handler = srp_abort,
1475 .eh_device_reset_handler = srp_reset_device,
1476 .eh_host_reset_handler = srp_reset_host,
1477 .can_queue = SRP_SQ_SIZE,
1478 .this_id = -1,
1479 .cmd_per_lun = SRP_SQ_SIZE,
1480 .use_clustering = ENABLE_CLUSTERING,
1481 .shost_attrs = srp_host_attrs
1482};
1483
1484static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1485{
1486 sprintf(target->target_name, "SRP.T10:%016llX",
1487 (unsigned long long) be64_to_cpu(target->id_ext));
1488
1489 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1490 return -ENODEV;
1491
1492 spin_lock(&host->target_lock);
1493 list_add_tail(&target->list, &host->target_list);
1494 spin_unlock(&host->target_lock);
1495
1496 target->state = SRP_TARGET_LIVE;
1497
1498 scsi_scan_target(&target->scsi_host->shost_gendev,
1499 0, target->scsi_id, SCAN_WILD_CARD, 0);
1500
1501 return 0;
1502}
1503
1504static void srp_release_class_dev(struct class_device *class_dev)
1505{
1506 struct srp_host *host =
1507 container_of(class_dev, struct srp_host, class_dev);
1508
1509 complete(&host->released);
1510}
1511
1512static struct class srp_class = {
1513 .name = "infiniband_srp",
1514 .release = srp_release_class_dev
1515};
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525enum {
1526 SRP_OPT_ERR = 0,
1527 SRP_OPT_ID_EXT = 1 << 0,
1528 SRP_OPT_IOC_GUID = 1 << 1,
1529 SRP_OPT_DGID = 1 << 2,
1530 SRP_OPT_PKEY = 1 << 3,
1531 SRP_OPT_SERVICE_ID = 1 << 4,
1532 SRP_OPT_MAX_SECT = 1 << 5,
1533 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1534 SRP_OPT_IO_CLASS = 1 << 7,
1535 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1536 SRP_OPT_IOC_GUID |
1537 SRP_OPT_DGID |
1538 SRP_OPT_PKEY |
1539 SRP_OPT_SERVICE_ID),
1540};
1541
1542static match_table_t srp_opt_tokens = {
1543 { SRP_OPT_ID_EXT, "id_ext=%s" },
1544 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1545 { SRP_OPT_DGID, "dgid=%s" },
1546 { SRP_OPT_PKEY, "pkey=%x" },
1547 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1548 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1549 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1550 { SRP_OPT_IO_CLASS, "io_class=%x" },
1551 { SRP_OPT_ERR, NULL }
1552};
1553
1554static int srp_parse_options(const char *buf, struct srp_target_port *target)
1555{
1556 char *options, *sep_opt;
1557 char *p;
1558 char dgid[3];
1559 substring_t args[MAX_OPT_ARGS];
1560 int opt_mask = 0;
1561 int token;
1562 int ret = -EINVAL;
1563 int i;
1564
1565 options = kstrdup(buf, GFP_KERNEL);
1566 if (!options)
1567 return -ENOMEM;
1568
1569 sep_opt = options;
1570 while ((p = strsep(&sep_opt, ",")) != NULL) {
1571 if (!*p)
1572 continue;
1573
1574 token = match_token(p, srp_opt_tokens, args);
1575 opt_mask |= token;
1576
1577 switch (token) {
1578 case SRP_OPT_ID_EXT:
1579 p = match_strdup(args);
1580 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1581 kfree(p);
1582 break;
1583
1584 case SRP_OPT_IOC_GUID:
1585 p = match_strdup(args);
1586 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1587 kfree(p);
1588 break;
1589
1590 case SRP_OPT_DGID:
1591 p = match_strdup(args);
1592 if (strlen(p) != 32) {
1593 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1594 kfree(p);
1595 goto out;
1596 }
1597
1598 for (i = 0; i < 16; ++i) {
1599 strlcpy(dgid, p + i * 2, 3);
1600 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1601 }
1602 kfree(p);
1603 break;
1604
1605 case SRP_OPT_PKEY:
1606 if (match_hex(args, &token)) {
1607 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1608 goto out;
1609 }
1610 target->path.pkey = cpu_to_be16(token);
1611 break;
1612
1613 case SRP_OPT_SERVICE_ID:
1614 p = match_strdup(args);
1615 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1616 kfree(p);
1617 break;
1618
1619 case SRP_OPT_MAX_SECT:
1620 if (match_int(args, &token)) {
1621 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1622 goto out;
1623 }
1624 target->scsi_host->max_sectors = token;
1625 break;
1626
1627 case SRP_OPT_MAX_CMD_PER_LUN:
1628 if (match_int(args, &token)) {
1629 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1630 goto out;
1631 }
1632 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1633 break;
1634
1635 case SRP_OPT_IO_CLASS:
1636 if (match_hex(args, &token)) {
1637 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1638 goto out;
1639 }
1640 if (token != SRP_REV10_IB_IO_CLASS &&
1641 token != SRP_REV16A_IB_IO_CLASS) {
1642 printk(KERN_WARNING PFX "unknown IO class parameter value"
1643 " %x specified (use %x or %x).\n",
1644 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1645 goto out;
1646 }
1647 target->io_class = token;
1648 break;
1649
1650 default:
1651 printk(KERN_WARNING PFX "unknown parameter or missing value "
1652 "'%s' in target creation request\n", p);
1653 goto out;
1654 }
1655 }
1656
1657 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1658 ret = 0;
1659 else
1660 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1661 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1662 !(srp_opt_tokens[i].token & opt_mask))
1663 printk(KERN_WARNING PFX "target creation request is "
1664 "missing parameter '%s'\n",
1665 srp_opt_tokens[i].pattern);
1666
1667out:
1668 kfree(options);
1669 return ret;
1670}
1671
1672static ssize_t srp_create_target(struct class_device *class_dev,
1673 const char *buf, size_t count)
1674{
1675 struct srp_host *host =
1676 container_of(class_dev, struct srp_host, class_dev);
1677 struct Scsi_Host *target_host;
1678 struct srp_target_port *target;
1679 int ret;
1680 int i;
1681
1682 target_host = scsi_host_alloc(&srp_template,
1683 sizeof (struct srp_target_port));
1684 if (!target_host)
1685 return -ENOMEM;
1686
1687 target_host->max_lun = SRP_MAX_LUN;
1688
1689 target = host_to_target(target_host);
1690 memset(target, 0, sizeof *target);
1691
1692 target->io_class = SRP_REV16A_IB_IO_CLASS;
1693 target->scsi_host = target_host;
1694 target->srp_host = host;
1695
1696 INIT_LIST_HEAD(&target->free_reqs);
1697 INIT_LIST_HEAD(&target->req_queue);
1698 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1699 target->req_ring[i].index = i;
1700 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1701 }
1702
1703 ret = srp_parse_options(buf, target);
1704 if (ret)
1705 goto err;
1706
1707 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1708
1709 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1710 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1711 (unsigned long long) be64_to_cpu(target->id_ext),
1712 (unsigned long long) be64_to_cpu(target->ioc_guid),
1713 be16_to_cpu(target->path.pkey),
1714 (unsigned long long) be64_to_cpu(target->service_id),
1715 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1716 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1717 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1718 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1719 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1720 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1721 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1722 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1723
1724 ret = srp_create_target_ib(target);
1725 if (ret)
1726 goto err;
1727
1728 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1729 if (IS_ERR(target->cm_id)) {
1730 ret = PTR_ERR(target->cm_id);
1731 goto err_free;
1732 }
1733
1734 ret = srp_connect_target(target);
1735 if (ret) {
1736 printk(KERN_ERR PFX "Connection failed\n");
1737 goto err_cm_id;
1738 }
1739
1740 ret = srp_add_target(host, target);
1741 if (ret)
1742 goto err_disconnect;
1743
1744 return count;
1745
1746err_disconnect:
1747 srp_disconnect_target(target);
1748
1749err_cm_id:
1750 ib_destroy_cm_id(target->cm_id);
1751
1752err_free:
1753 srp_free_target_ib(target);
1754
1755err:
1756 scsi_host_put(target_host);
1757
1758 return ret;
1759}
1760
1761static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1762
1763static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1764{
1765 struct srp_host *host =
1766 container_of(class_dev, struct srp_host, class_dev);
1767
1768 return sprintf(buf, "%s\n", host->dev->dev->name);
1769}
1770
1771static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1772
1773static ssize_t show_port(struct class_device *class_dev, char *buf)
1774{
1775 struct srp_host *host =
1776 container_of(class_dev, struct srp_host, class_dev);
1777
1778 return sprintf(buf, "%d\n", host->port);
1779}
1780
1781static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1782
1783static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1784{
1785 struct srp_host *host;
1786
1787 host = kzalloc(sizeof *host, GFP_KERNEL);
1788 if (!host)
1789 return NULL;
1790
1791 INIT_LIST_HEAD(&host->target_list);
1792 spin_lock_init(&host->target_lock);
1793 init_completion(&host->released);
1794 host->dev = device;
1795 host->port = port;
1796
1797 host->initiator_port_id[7] = port;
1798 memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8);
1799
1800 host->class_dev.class = &srp_class;
1801 host->class_dev.dev = device->dev->dma_device;
1802 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1803 device->dev->name, port);
1804
1805 if (class_device_register(&host->class_dev))
1806 goto free_host;
1807 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1808 goto err_class;
1809 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1810 goto err_class;
1811 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1812 goto err_class;
1813
1814 return host;
1815
1816err_class:
1817 class_device_unregister(&host->class_dev);
1818
1819free_host:
1820 kfree(host);
1821
1822 return NULL;
1823}
1824
1825static void srp_add_one(struct ib_device *device)
1826{
1827 struct srp_device *srp_dev;
1828 struct ib_device_attr *dev_attr;
1829 struct ib_fmr_pool_param fmr_param;
1830 struct srp_host *host;
1831 int s, e, p;
1832
1833 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1834 if (!dev_attr)
1835 return;
1836
1837 if (ib_query_device(device, dev_attr)) {
1838 printk(KERN_WARNING PFX "Query device failed for %s\n",
1839 device->name);
1840 goto free_attr;
1841 }
1842
1843 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1844 if (!srp_dev)
1845 goto free_attr;
1846
1847
1848
1849
1850
1851
1852 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1853 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
1854 srp_dev->fmr_page_mask = ~((unsigned long) srp_dev->fmr_page_size - 1);
1855
1856 INIT_LIST_HEAD(&srp_dev->dev_list);
1857
1858 srp_dev->dev = device;
1859 srp_dev->pd = ib_alloc_pd(device);
1860 if (IS_ERR(srp_dev->pd))
1861 goto free_dev;
1862
1863 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1864 IB_ACCESS_LOCAL_WRITE |
1865 IB_ACCESS_REMOTE_READ |
1866 IB_ACCESS_REMOTE_WRITE);
1867 if (IS_ERR(srp_dev->mr))
1868 goto err_pd;
1869
1870 memset(&fmr_param, 0, sizeof fmr_param);
1871 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
1872 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
1873 fmr_param.cache = 1;
1874 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1875 fmr_param.page_shift = srp_dev->fmr_page_shift;
1876 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
1877 IB_ACCESS_REMOTE_WRITE |
1878 IB_ACCESS_REMOTE_READ);
1879
1880 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1881 if (IS_ERR(srp_dev->fmr_pool))
1882 srp_dev->fmr_pool = NULL;
1883
1884 if (device->node_type == IB_NODE_SWITCH) {
1885 s = 0;
1886 e = 0;
1887 } else {
1888 s = 1;
1889 e = device->phys_port_cnt;
1890 }
1891
1892 for (p = s; p <= e; ++p) {
1893 host = srp_add_port(srp_dev, p);
1894 if (host)
1895 list_add_tail(&host->list, &srp_dev->dev_list);
1896 }
1897
1898 ib_set_client_data(device, &srp_client, srp_dev);
1899
1900 goto free_attr;
1901
1902err_pd:
1903 ib_dealloc_pd(srp_dev->pd);
1904
1905free_dev:
1906 kfree(srp_dev);
1907
1908free_attr:
1909 kfree(dev_attr);
1910}
1911
1912static void srp_remove_one(struct ib_device *device)
1913{
1914 struct srp_device *srp_dev;
1915 struct srp_host *host, *tmp_host;
1916 LIST_HEAD(target_list);
1917 struct srp_target_port *target, *tmp_target;
1918
1919 srp_dev = ib_get_client_data(device, &srp_client);
1920
1921 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1922 class_device_unregister(&host->class_dev);
1923
1924
1925
1926
1927 wait_for_completion(&host->released);
1928
1929
1930
1931
1932
1933 spin_lock(&host->target_lock);
1934 list_for_each_entry(target, &host->target_list, list) {
1935 spin_lock_irq(target->scsi_host->host_lock);
1936 target->state = SRP_TARGET_REMOVED;
1937 spin_unlock_irq(target->scsi_host->host_lock);
1938 }
1939 spin_unlock(&host->target_lock);
1940
1941
1942
1943
1944
1945
1946 flush_scheduled_work();
1947
1948 list_for_each_entry_safe(target, tmp_target,
1949 &host->target_list, list) {
1950 scsi_remove_host(target->scsi_host);
1951 srp_disconnect_target(target);
1952 ib_destroy_cm_id(target->cm_id);
1953 srp_free_target_ib(target);
1954 scsi_host_put(target->scsi_host);
1955 }
1956
1957 kfree(host);
1958 }
1959
1960 if (srp_dev->fmr_pool)
1961 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1962 ib_dereg_mr(srp_dev->mr);
1963 ib_dealloc_pd(srp_dev->pd);
1964
1965 kfree(srp_dev);
1966}
1967
1968static int __init srp_init_module(void)
1969{
1970 int ret;
1971
1972 srp_template.sg_tablesize = srp_sg_tablesize;
1973 srp_max_iu_len = (sizeof (struct srp_cmd) +
1974 sizeof (struct srp_indirect_buf) +
1975 srp_sg_tablesize * 16);
1976
1977 ret = class_register(&srp_class);
1978 if (ret) {
1979 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1980 return ret;
1981 }
1982
1983 ret = ib_register_client(&srp_client);
1984 if (ret) {
1985 printk(KERN_ERR PFX "couldn't register IB client\n");
1986 class_unregister(&srp_class);
1987 return ret;
1988 }
1989
1990 return 0;
1991}
1992
1993static void __exit srp_cleanup_module(void)
1994{
1995 ib_unregister_client(&srp_client);
1996 class_unregister(&srp_class);
1997}
1998
1999module_init(srp_init_module);
2000module_exit(srp_cleanup_module);
2001
