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IB/srp: Get rid of "Target has req_lim 0" messages
[deliverable/linux.git] / drivers / infiniband / ulp / srp / ib_srp.c
1 /*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
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/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
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63 MODULE_LICENSE("Dual BSD/GPL");
64
65 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
66 static int srp_max_iu_len;
67
68 module_param(srp_sg_tablesize, int, 0444);
69 MODULE_PARM_DESC(srp_sg_tablesize,
70 "Max number of gather/scatter entries per I/O (default is 12)");
71
72 static int topspin_workarounds = 1;
73
74 module_param(topspin_workarounds, int, 0444);
75 MODULE_PARM_DESC(topspin_workarounds,
76 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
77
78 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
79
80 static void srp_add_one(struct ib_device *device);
81 static void srp_remove_one(struct ib_device *device);
82 static void srp_completion(struct ib_cq *cq, void *target_ptr);
83 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
84
85 static struct ib_client srp_client = {
86 .name = "srp",
87 .add = srp_add_one,
88 .remove = srp_remove_one
89 };
90
91 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
92 {
93 return (struct srp_target_port *) host->hostdata;
94 }
95
96 static const char *srp_target_info(struct Scsi_Host *host)
97 {
98 return host_to_target(host)->target_name;
99 }
100
101 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
102 gfp_t gfp_mask,
103 enum dma_data_direction direction)
104 {
105 struct srp_iu *iu;
106
107 iu = kmalloc(sizeof *iu, gfp_mask);
108 if (!iu)
109 goto out;
110
111 iu->buf = kzalloc(size, gfp_mask);
112 if (!iu->buf)
113 goto out_free_iu;
114
115 iu->dma = dma_map_single(host->dev->dev->dma_device,
116 iu->buf, size, direction);
117 if (dma_mapping_error(iu->dma))
118 goto out_free_buf;
119
120 iu->size = size;
121 iu->direction = direction;
122
123 return iu;
124
125 out_free_buf:
126 kfree(iu->buf);
127 out_free_iu:
128 kfree(iu);
129 out:
130 return NULL;
131 }
132
133 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
134 {
135 if (!iu)
136 return;
137
138 dma_unmap_single(host->dev->dev->dma_device,
139 iu->dma, iu->size, iu->direction);
140 kfree(iu->buf);
141 kfree(iu);
142 }
143
144 static void srp_qp_event(struct ib_event *event, void *context)
145 {
146 printk(KERN_ERR PFX "QP event %d\n", event->event);
147 }
148
149 static int srp_init_qp(struct srp_target_port *target,
150 struct ib_qp *qp)
151 {
152 struct ib_qp_attr *attr;
153 int ret;
154
155 attr = kmalloc(sizeof *attr, GFP_KERNEL);
156 if (!attr)
157 return -ENOMEM;
158
159 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
160 target->srp_host->port,
161 be16_to_cpu(target->path.pkey),
162 &attr->pkey_index);
163 if (ret)
164 goto out;
165
166 attr->qp_state = IB_QPS_INIT;
167 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
168 IB_ACCESS_REMOTE_WRITE);
169 attr->port_num = target->srp_host->port;
170
171 ret = ib_modify_qp(qp, attr,
172 IB_QP_STATE |
173 IB_QP_PKEY_INDEX |
174 IB_QP_ACCESS_FLAGS |
175 IB_QP_PORT);
176
177 out:
178 kfree(attr);
179 return ret;
180 }
181
182 static int srp_create_target_ib(struct srp_target_port *target)
183 {
184 struct ib_qp_init_attr *init_attr;
185 int ret;
186
187 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
188 if (!init_attr)
189 return -ENOMEM;
190
191 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
192 NULL, target, SRP_CQ_SIZE);
193 if (IS_ERR(target->cq)) {
194 ret = PTR_ERR(target->cq);
195 goto out;
196 }
197
198 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
199
200 init_attr->event_handler = srp_qp_event;
201 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
202 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
203 init_attr->cap.max_recv_sge = 1;
204 init_attr->cap.max_send_sge = 1;
205 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
206 init_attr->qp_type = IB_QPT_RC;
207 init_attr->send_cq = target->cq;
208 init_attr->recv_cq = target->cq;
209
210 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
211 if (IS_ERR(target->qp)) {
212 ret = PTR_ERR(target->qp);
213 ib_destroy_cq(target->cq);
214 goto out;
215 }
216
217 ret = srp_init_qp(target, target->qp);
218 if (ret) {
219 ib_destroy_qp(target->qp);
220 ib_destroy_cq(target->cq);
221 goto out;
222 }
223
224 out:
225 kfree(init_attr);
226 return ret;
227 }
228
229 static void srp_free_target_ib(struct srp_target_port *target)
230 {
231 int i;
232
233 ib_destroy_qp(target->qp);
234 ib_destroy_cq(target->cq);
235
236 for (i = 0; i < SRP_RQ_SIZE; ++i)
237 srp_free_iu(target->srp_host, target->rx_ring[i]);
238 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
239 srp_free_iu(target->srp_host, target->tx_ring[i]);
240 }
241
242 static void srp_path_rec_completion(int status,
243 struct ib_sa_path_rec *pathrec,
244 void *target_ptr)
245 {
246 struct srp_target_port *target = target_ptr;
247
248 target->status = status;
249 if (status)
250 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
251 else
252 target->path = *pathrec;
253 complete(&target->done);
254 }
255
256 static int srp_lookup_path(struct srp_target_port *target)
257 {
258 target->path.numb_path = 1;
259
260 init_completion(&target->done);
261
262 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev->dev,
263 target->srp_host->port,
264 &target->path,
265 IB_SA_PATH_REC_DGID |
266 IB_SA_PATH_REC_SGID |
267 IB_SA_PATH_REC_NUMB_PATH |
268 IB_SA_PATH_REC_PKEY,
269 SRP_PATH_REC_TIMEOUT_MS,
270 GFP_KERNEL,
271 srp_path_rec_completion,
272 target, &target->path_query);
273 if (target->path_query_id < 0)
274 return target->path_query_id;
275
276 wait_for_completion(&target->done);
277
278 if (target->status < 0)
279 printk(KERN_WARNING PFX "Path record query failed\n");
280
281 return target->status;
282 }
283
284 static int srp_send_req(struct srp_target_port *target)
285 {
286 struct {
287 struct ib_cm_req_param param;
288 struct srp_login_req priv;
289 } *req = NULL;
290 int status;
291
292 req = kzalloc(sizeof *req, GFP_KERNEL);
293 if (!req)
294 return -ENOMEM;
295
296 req->param.primary_path = &target->path;
297 req->param.alternate_path = NULL;
298 req->param.service_id = target->service_id;
299 req->param.qp_num = target->qp->qp_num;
300 req->param.qp_type = target->qp->qp_type;
301 req->param.private_data = &req->priv;
302 req->param.private_data_len = sizeof req->priv;
303 req->param.flow_control = 1;
304
305 get_random_bytes(&req->param.starting_psn, 4);
306 req->param.starting_psn &= 0xffffff;
307
308 /*
309 * Pick some arbitrary defaults here; we could make these
310 * module parameters if anyone cared about setting them.
311 */
312 req->param.responder_resources = 4;
313 req->param.remote_cm_response_timeout = 20;
314 req->param.local_cm_response_timeout = 20;
315 req->param.retry_count = 7;
316 req->param.rnr_retry_count = 7;
317 req->param.max_cm_retries = 15;
318
319 req->priv.opcode = SRP_LOGIN_REQ;
320 req->priv.tag = 0;
321 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
322 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
323 SRP_BUF_FORMAT_INDIRECT);
324 memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
325 /*
326 * Topspin/Cisco SRP targets will reject our login unless we
327 * zero out the first 8 bytes of our initiator port ID. The
328 * second 8 bytes must be our local node GUID, but we always
329 * use that anyway.
330 */
331 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
332 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
333 "activated for target GUID %016llx\n",
334 (unsigned long long) be64_to_cpu(target->ioc_guid));
335 memset(req->priv.initiator_port_id, 0, 8);
336 }
337 memcpy(req->priv.target_port_id, &target->id_ext, 8);
338 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
339
340 status = ib_send_cm_req(target->cm_id, &req->param);
341
342 kfree(req);
343
344 return status;
345 }
346
347 static void srp_disconnect_target(struct srp_target_port *target)
348 {
349 /* XXX should send SRP_I_LOGOUT request */
350
351 init_completion(&target->done);
352 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
353 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
354 return;
355 }
356 wait_for_completion(&target->done);
357 }
358
359 static void srp_remove_work(void *target_ptr)
360 {
361 struct srp_target_port *target = target_ptr;
362
363 spin_lock_irq(target->scsi_host->host_lock);
364 if (target->state != SRP_TARGET_DEAD) {
365 spin_unlock_irq(target->scsi_host->host_lock);
366 return;
367 }
368 target->state = SRP_TARGET_REMOVED;
369 spin_unlock_irq(target->scsi_host->host_lock);
370
371 spin_lock(&target->srp_host->target_lock);
372 list_del(&target->list);
373 spin_unlock(&target->srp_host->target_lock);
374
375 scsi_remove_host(target->scsi_host);
376 ib_destroy_cm_id(target->cm_id);
377 srp_free_target_ib(target);
378 scsi_host_put(target->scsi_host);
379 }
380
381 static int srp_connect_target(struct srp_target_port *target)
382 {
383 int ret;
384
385 ret = srp_lookup_path(target);
386 if (ret)
387 return ret;
388
389 while (1) {
390 init_completion(&target->done);
391 ret = srp_send_req(target);
392 if (ret)
393 return ret;
394 wait_for_completion(&target->done);
395
396 /*
397 * The CM event handling code will set status to
398 * SRP_PORT_REDIRECT if we get a port redirect REJ
399 * back, or SRP_DLID_REDIRECT if we get a lid/qp
400 * redirect REJ back.
401 */
402 switch (target->status) {
403 case 0:
404 return 0;
405
406 case SRP_PORT_REDIRECT:
407 ret = srp_lookup_path(target);
408 if (ret)
409 return ret;
410 break;
411
412 case SRP_DLID_REDIRECT:
413 break;
414
415 default:
416 return target->status;
417 }
418 }
419 }
420
421 static void srp_unmap_data(struct scsi_cmnd *scmnd,
422 struct srp_target_port *target,
423 struct srp_request *req)
424 {
425 struct scatterlist *scat;
426 int nents;
427
428 if (!scmnd->request_buffer ||
429 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
430 scmnd->sc_data_direction != DMA_FROM_DEVICE))
431 return;
432
433 if (req->fmr) {
434 ib_fmr_pool_unmap(req->fmr);
435 req->fmr = NULL;
436 }
437
438 /*
439 * This handling of non-SG commands can be killed when the
440 * SCSI midlayer no longer generates non-SG commands.
441 */
442 if (likely(scmnd->use_sg)) {
443 nents = scmnd->use_sg;
444 scat = scmnd->request_buffer;
445 } else {
446 nents = 1;
447 scat = &req->fake_sg;
448 }
449
450 dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
451 scmnd->sc_data_direction);
452 }
453
454 static int srp_reconnect_target(struct srp_target_port *target)
455 {
456 struct ib_cm_id *new_cm_id;
457 struct ib_qp_attr qp_attr;
458 struct srp_request *req;
459 struct ib_wc wc;
460 int ret;
461 int i;
462
463 spin_lock_irq(target->scsi_host->host_lock);
464 if (target->state != SRP_TARGET_LIVE) {
465 spin_unlock_irq(target->scsi_host->host_lock);
466 return -EAGAIN;
467 }
468 target->state = SRP_TARGET_CONNECTING;
469 spin_unlock_irq(target->scsi_host->host_lock);
470
471 srp_disconnect_target(target);
472 /*
473 * Now get a new local CM ID so that we avoid confusing the
474 * target in case things are really fouled up.
475 */
476 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
477 srp_cm_handler, target);
478 if (IS_ERR(new_cm_id)) {
479 ret = PTR_ERR(new_cm_id);
480 goto err;
481 }
482 ib_destroy_cm_id(target->cm_id);
483 target->cm_id = new_cm_id;
484
485 qp_attr.qp_state = IB_QPS_RESET;
486 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
487 if (ret)
488 goto err;
489
490 ret = srp_init_qp(target, target->qp);
491 if (ret)
492 goto err;
493
494 while (ib_poll_cq(target->cq, 1, &wc) > 0)
495 ; /* nothing */
496
497 list_for_each_entry(req, &target->req_queue, list) {
498 req->scmnd->result = DID_RESET << 16;
499 req->scmnd->scsi_done(req->scmnd);
500 srp_unmap_data(req->scmnd, target, req);
501 }
502
503 target->rx_head = 0;
504 target->tx_head = 0;
505 target->tx_tail = 0;
506 INIT_LIST_HEAD(&target->free_reqs);
507 INIT_LIST_HEAD(&target->req_queue);
508 for (i = 0; i < SRP_SQ_SIZE; ++i)
509 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
510
511 ret = srp_connect_target(target);
512 if (ret)
513 goto err;
514
515 spin_lock_irq(target->scsi_host->host_lock);
516 if (target->state == SRP_TARGET_CONNECTING) {
517 ret = 0;
518 target->state = SRP_TARGET_LIVE;
519 } else
520 ret = -EAGAIN;
521 spin_unlock_irq(target->scsi_host->host_lock);
522
523 return ret;
524
525 err:
526 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
527
528 /*
529 * We couldn't reconnect, so kill our target port off.
530 * However, we have to defer the real removal because we might
531 * be in the context of the SCSI error handler now, which
532 * would deadlock if we call scsi_remove_host().
533 */
534 spin_lock_irq(target->scsi_host->host_lock);
535 if (target->state == SRP_TARGET_CONNECTING) {
536 target->state = SRP_TARGET_DEAD;
537 INIT_WORK(&target->work, srp_remove_work, target);
538 schedule_work(&target->work);
539 }
540 spin_unlock_irq(target->scsi_host->host_lock);
541
542 return ret;
543 }
544
545 static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat,
546 int sg_cnt, struct srp_request *req,
547 struct srp_direct_buf *buf)
548 {
549 u64 io_addr = 0;
550 u64 *dma_pages;
551 u32 len;
552 int page_cnt;
553 int i, j;
554 int ret;
555
556 if (!dev->fmr_pool)
557 return -ENODEV;
558
559 len = page_cnt = 0;
560 for (i = 0; i < sg_cnt; ++i) {
561 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
562 if (i > 0)
563 return -EINVAL;
564 else
565 ++page_cnt;
566 }
567 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
568 ~dev->fmr_page_mask) {
569 if (i < sg_cnt - 1)
570 return -EINVAL;
571 else
572 ++page_cnt;
573 }
574
575 len += sg_dma_len(&scat[i]);
576 }
577
578 page_cnt += len >> dev->fmr_page_shift;
579 if (page_cnt > SRP_FMR_SIZE)
580 return -ENOMEM;
581
582 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
583 if (!dma_pages)
584 return -ENOMEM;
585
586 page_cnt = 0;
587 for (i = 0; i < sg_cnt; ++i)
588 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
589 dma_pages[page_cnt++] =
590 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
591
592 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
593 dma_pages, page_cnt, &io_addr);
594 if (IS_ERR(req->fmr)) {
595 ret = PTR_ERR(req->fmr);
596 goto out;
597 }
598
599 buf->va = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
600 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
601 buf->len = cpu_to_be32(len);
602
603 ret = 0;
604
605 out:
606 kfree(dma_pages);
607
608 return ret;
609 }
610
611 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
612 struct srp_request *req)
613 {
614 struct scatterlist *scat;
615 struct srp_cmd *cmd = req->cmd->buf;
616 int len, nents, count;
617 u8 fmt = SRP_DATA_DESC_DIRECT;
618
619 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
620 return sizeof (struct srp_cmd);
621
622 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
623 scmnd->sc_data_direction != DMA_TO_DEVICE) {
624 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
625 scmnd->sc_data_direction);
626 return -EINVAL;
627 }
628
629 /*
630 * This handling of non-SG commands can be killed when the
631 * SCSI midlayer no longer generates non-SG commands.
632 */
633 if (likely(scmnd->use_sg)) {
634 nents = scmnd->use_sg;
635 scat = scmnd->request_buffer;
636 } else {
637 nents = 1;
638 scat = &req->fake_sg;
639 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
640 }
641
642 count = dma_map_sg(target->srp_host->dev->dev->dma_device,
643 scat, nents, scmnd->sc_data_direction);
644
645 fmt = SRP_DATA_DESC_DIRECT;
646 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
647
648 if (count == 1) {
649 /*
650 * The midlayer only generated a single gather/scatter
651 * entry, or DMA mapping coalesced everything to a
652 * single entry. So a direct descriptor along with
653 * the DMA MR suffices.
654 */
655 struct srp_direct_buf *buf = (void *) cmd->add_data;
656
657 buf->va = cpu_to_be64(sg_dma_address(scat));
658 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
659 buf->len = cpu_to_be32(sg_dma_len(scat));
660 } else if (srp_map_fmr(target->srp_host->dev, scat, count, req,
661 (void *) cmd->add_data)) {
662 /*
663 * FMR mapping failed, and the scatterlist has more
664 * than one entry. Generate an indirect memory
665 * descriptor.
666 */
667 struct srp_indirect_buf *buf = (void *) cmd->add_data;
668 u32 datalen = 0;
669 int i;
670
671 fmt = SRP_DATA_DESC_INDIRECT;
672 len = sizeof (struct srp_cmd) +
673 sizeof (struct srp_indirect_buf) +
674 count * sizeof (struct srp_direct_buf);
675
676 for (i = 0; i < count; ++i) {
677 buf->desc_list[i].va =
678 cpu_to_be64(sg_dma_address(&scat[i]));
679 buf->desc_list[i].key =
680 cpu_to_be32(target->srp_host->dev->mr->rkey);
681 buf->desc_list[i].len =
682 cpu_to_be32(sg_dma_len(&scat[i]));
683 datalen += sg_dma_len(&scat[i]);
684 }
685
686 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
687 cmd->data_out_desc_cnt = count;
688 else
689 cmd->data_in_desc_cnt = count;
690
691 buf->table_desc.va =
692 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
693 buf->table_desc.key =
694 cpu_to_be32(target->srp_host->dev->mr->rkey);
695 buf->table_desc.len =
696 cpu_to_be32(count * sizeof (struct srp_direct_buf));
697
698 buf->len = cpu_to_be32(datalen);
699 }
700
701 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
702 cmd->buf_fmt = fmt << 4;
703 else
704 cmd->buf_fmt = fmt;
705
706 return len;
707 }
708
709 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
710 {
711 srp_unmap_data(req->scmnd, target, req);
712 list_move_tail(&req->list, &target->free_reqs);
713 }
714
715 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
716 {
717 struct srp_request *req;
718 struct scsi_cmnd *scmnd;
719 unsigned long flags;
720 s32 delta;
721
722 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
723
724 spin_lock_irqsave(target->scsi_host->host_lock, flags);
725
726 target->req_lim += delta;
727
728 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
729
730 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
731 if (be32_to_cpu(rsp->resp_data_len) < 4)
732 req->tsk_status = -1;
733 else
734 req->tsk_status = rsp->data[3];
735 complete(&req->done);
736 } else {
737 scmnd = req->scmnd;
738 if (!scmnd)
739 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
740 (unsigned long long) rsp->tag);
741 scmnd->result = rsp->status;
742
743 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
744 memcpy(scmnd->sense_buffer, rsp->data +
745 be32_to_cpu(rsp->resp_data_len),
746 min_t(int, be32_to_cpu(rsp->sense_data_len),
747 SCSI_SENSE_BUFFERSIZE));
748 }
749
750 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
751 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
752 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
753 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
754
755 if (!req->tsk_mgmt) {
756 scmnd->host_scribble = (void *) -1L;
757 scmnd->scsi_done(scmnd);
758
759 srp_remove_req(target, req);
760 } else
761 req->cmd_done = 1;
762 }
763
764 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
765 }
766
767 static void srp_reconnect_work(void *target_ptr)
768 {
769 struct srp_target_port *target = target_ptr;
770
771 srp_reconnect_target(target);
772 }
773
774 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
775 {
776 struct srp_iu *iu;
777 u8 opcode;
778
779 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
780
781 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
782 target->max_ti_iu_len, DMA_FROM_DEVICE);
783
784 opcode = *(u8 *) iu->buf;
785
786 if (0) {
787 int i;
788
789 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
790
791 for (i = 0; i < wc->byte_len; ++i) {
792 if (i % 8 == 0)
793 printk(KERN_ERR " [%02x] ", i);
794 printk(" %02x", ((u8 *) iu->buf)[i]);
795 if ((i + 1) % 8 == 0)
796 printk("\n");
797 }
798
799 if (wc->byte_len % 8)
800 printk("\n");
801 }
802
803 switch (opcode) {
804 case SRP_RSP:
805 srp_process_rsp(target, iu->buf);
806 break;
807
808 case SRP_T_LOGOUT:
809 /* XXX Handle target logout */
810 printk(KERN_WARNING PFX "Got target logout request\n");
811 break;
812
813 default:
814 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
815 break;
816 }
817
818 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
819 target->max_ti_iu_len, DMA_FROM_DEVICE);
820 }
821
822 static void srp_completion(struct ib_cq *cq, void *target_ptr)
823 {
824 struct srp_target_port *target = target_ptr;
825 struct ib_wc wc;
826 unsigned long flags;
827
828 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
829 while (ib_poll_cq(cq, 1, &wc) > 0) {
830 if (wc.status) {
831 printk(KERN_ERR PFX "failed %s status %d\n",
832 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
833 wc.status);
834 spin_lock_irqsave(target->scsi_host->host_lock, flags);
835 if (target->state == SRP_TARGET_LIVE)
836 schedule_work(&target->work);
837 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
838 break;
839 }
840
841 if (wc.wr_id & SRP_OP_RECV)
842 srp_handle_recv(target, &wc);
843 else
844 ++target->tx_tail;
845 }
846 }
847
848 static int __srp_post_recv(struct srp_target_port *target)
849 {
850 struct srp_iu *iu;
851 struct ib_sge list;
852 struct ib_recv_wr wr, *bad_wr;
853 unsigned int next;
854 int ret;
855
856 next = target->rx_head & (SRP_RQ_SIZE - 1);
857 wr.wr_id = next | SRP_OP_RECV;
858 iu = target->rx_ring[next];
859
860 list.addr = iu->dma;
861 list.length = iu->size;
862 list.lkey = target->srp_host->dev->mr->lkey;
863
864 wr.next = NULL;
865 wr.sg_list = &list;
866 wr.num_sge = 1;
867
868 ret = ib_post_recv(target->qp, &wr, &bad_wr);
869 if (!ret)
870 ++target->rx_head;
871
872 return ret;
873 }
874
875 static int srp_post_recv(struct srp_target_port *target)
876 {
877 unsigned long flags;
878 int ret;
879
880 spin_lock_irqsave(target->scsi_host->host_lock, flags);
881 ret = __srp_post_recv(target);
882 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
883
884 return ret;
885 }
886
887 /*
888 * Must be called with target->scsi_host->host_lock held to protect
889 * req_lim and tx_head. Lock cannot be dropped between call here and
890 * call to __srp_post_send().
891 */
892 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
893 {
894 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
895 return NULL;
896
897 if (unlikely(target->req_lim < 1))
898 ++target->zero_req_lim;
899
900 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
901 }
902
903 /*
904 * Must be called with target->scsi_host->host_lock held to protect
905 * req_lim and tx_head.
906 */
907 static int __srp_post_send(struct srp_target_port *target,
908 struct srp_iu *iu, int len)
909 {
910 struct ib_sge list;
911 struct ib_send_wr wr, *bad_wr;
912 int ret = 0;
913
914 list.addr = iu->dma;
915 list.length = len;
916 list.lkey = target->srp_host->dev->mr->lkey;
917
918 wr.next = NULL;
919 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
920 wr.sg_list = &list;
921 wr.num_sge = 1;
922 wr.opcode = IB_WR_SEND;
923 wr.send_flags = IB_SEND_SIGNALED;
924
925 ret = ib_post_send(target->qp, &wr, &bad_wr);
926
927 if (!ret) {
928 ++target->tx_head;
929 --target->req_lim;
930 }
931
932 return ret;
933 }
934
935 static int srp_queuecommand(struct scsi_cmnd *scmnd,
936 void (*done)(struct scsi_cmnd *))
937 {
938 struct srp_target_port *target = host_to_target(scmnd->device->host);
939 struct srp_request *req;
940 struct srp_iu *iu;
941 struct srp_cmd *cmd;
942 int len;
943
944 if (target->state == SRP_TARGET_CONNECTING)
945 goto err;
946
947 if (target->state == SRP_TARGET_DEAD ||
948 target->state == SRP_TARGET_REMOVED) {
949 scmnd->result = DID_BAD_TARGET << 16;
950 done(scmnd);
951 return 0;
952 }
953
954 iu = __srp_get_tx_iu(target);
955 if (!iu)
956 goto err;
957
958 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
959 srp_max_iu_len, DMA_TO_DEVICE);
960
961 req = list_entry(target->free_reqs.next, struct srp_request, list);
962
963 scmnd->scsi_done = done;
964 scmnd->result = 0;
965 scmnd->host_scribble = (void *) (long) req->index;
966
967 cmd = iu->buf;
968 memset(cmd, 0, sizeof *cmd);
969
970 cmd->opcode = SRP_CMD;
971 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
972 cmd->tag = req->index;
973 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
974
975 req->scmnd = scmnd;
976 req->cmd = iu;
977 req->cmd_done = 0;
978 req->tsk_mgmt = NULL;
979
980 len = srp_map_data(scmnd, target, req);
981 if (len < 0) {
982 printk(KERN_ERR PFX "Failed to map data\n");
983 goto err;
984 }
985
986 if (__srp_post_recv(target)) {
987 printk(KERN_ERR PFX "Recv failed\n");
988 goto err_unmap;
989 }
990
991 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
992 srp_max_iu_len, DMA_TO_DEVICE);
993
994 if (__srp_post_send(target, iu, len)) {
995 printk(KERN_ERR PFX "Send failed\n");
996 goto err_unmap;
997 }
998
999 list_move_tail(&req->list, &target->req_queue);
1000
1001 return 0;
1002
1003 err_unmap:
1004 srp_unmap_data(scmnd, target, req);
1005
1006 err:
1007 return SCSI_MLQUEUE_HOST_BUSY;
1008 }
1009
1010 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1011 {
1012 int i;
1013
1014 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1015 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1016 target->max_ti_iu_len,
1017 GFP_KERNEL, DMA_FROM_DEVICE);
1018 if (!target->rx_ring[i])
1019 goto err;
1020 }
1021
1022 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1023 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1024 srp_max_iu_len,
1025 GFP_KERNEL, DMA_TO_DEVICE);
1026 if (!target->tx_ring[i])
1027 goto err;
1028 }
1029
1030 return 0;
1031
1032 err:
1033 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1034 srp_free_iu(target->srp_host, target->rx_ring[i]);
1035 target->rx_ring[i] = NULL;
1036 }
1037
1038 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1039 srp_free_iu(target->srp_host, target->tx_ring[i]);
1040 target->tx_ring[i] = NULL;
1041 }
1042
1043 return -ENOMEM;
1044 }
1045
1046 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1047 struct ib_cm_event *event,
1048 struct srp_target_port *target)
1049 {
1050 struct ib_class_port_info *cpi;
1051 int opcode;
1052
1053 switch (event->param.rej_rcvd.reason) {
1054 case IB_CM_REJ_PORT_CM_REDIRECT:
1055 cpi = event->param.rej_rcvd.ari;
1056 target->path.dlid = cpi->redirect_lid;
1057 target->path.pkey = cpi->redirect_pkey;
1058 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1059 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1060
1061 target->status = target->path.dlid ?
1062 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1063 break;
1064
1065 case IB_CM_REJ_PORT_REDIRECT:
1066 if (topspin_workarounds &&
1067 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1068 /*
1069 * Topspin/Cisco SRP gateways incorrectly send
1070 * reject reason code 25 when they mean 24
1071 * (port redirect).
1072 */
1073 memcpy(target->path.dgid.raw,
1074 event->param.rej_rcvd.ari, 16);
1075
1076 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1077 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1078 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1079
1080 target->status = SRP_PORT_REDIRECT;
1081 } else {
1082 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1083 target->status = -ECONNRESET;
1084 }
1085 break;
1086
1087 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1088 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1089 target->status = -ECONNRESET;
1090 break;
1091
1092 case IB_CM_REJ_CONSUMER_DEFINED:
1093 opcode = *(u8 *) event->private_data;
1094 if (opcode == SRP_LOGIN_REJ) {
1095 struct srp_login_rej *rej = event->private_data;
1096 u32 reason = be32_to_cpu(rej->reason);
1097
1098 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1099 printk(KERN_WARNING PFX
1100 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1101 else
1102 printk(KERN_WARNING PFX
1103 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1104 } else
1105 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1106 " opcode 0x%02x\n", opcode);
1107 target->status = -ECONNRESET;
1108 break;
1109
1110 default:
1111 printk(KERN_WARNING " REJ reason 0x%x\n",
1112 event->param.rej_rcvd.reason);
1113 target->status = -ECONNRESET;
1114 }
1115 }
1116
1117 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1118 {
1119 struct srp_target_port *target = cm_id->context;
1120 struct ib_qp_attr *qp_attr = NULL;
1121 int attr_mask = 0;
1122 int comp = 0;
1123 int opcode = 0;
1124
1125 switch (event->event) {
1126 case IB_CM_REQ_ERROR:
1127 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1128 comp = 1;
1129 target->status = -ECONNRESET;
1130 break;
1131
1132 case IB_CM_REP_RECEIVED:
1133 comp = 1;
1134 opcode = *(u8 *) event->private_data;
1135
1136 if (opcode == SRP_LOGIN_RSP) {
1137 struct srp_login_rsp *rsp = event->private_data;
1138
1139 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1140 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1141
1142 target->scsi_host->can_queue = min(target->req_lim,
1143 target->scsi_host->can_queue);
1144 } else {
1145 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1146 target->status = -ECONNRESET;
1147 break;
1148 }
1149
1150 target->status = srp_alloc_iu_bufs(target);
1151 if (target->status)
1152 break;
1153
1154 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1155 if (!qp_attr) {
1156 target->status = -ENOMEM;
1157 break;
1158 }
1159
1160 qp_attr->qp_state = IB_QPS_RTR;
1161 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1162 if (target->status)
1163 break;
1164
1165 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1166 if (target->status)
1167 break;
1168
1169 target->status = srp_post_recv(target);
1170 if (target->status)
1171 break;
1172
1173 qp_attr->qp_state = IB_QPS_RTS;
1174 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1175 if (target->status)
1176 break;
1177
1178 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1179 if (target->status)
1180 break;
1181
1182 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1183 if (target->status)
1184 break;
1185
1186 break;
1187
1188 case IB_CM_REJ_RECEIVED:
1189 printk(KERN_DEBUG PFX "REJ received\n");
1190 comp = 1;
1191
1192 srp_cm_rej_handler(cm_id, event, target);
1193 break;
1194
1195 case IB_CM_DREQ_RECEIVED:
1196 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1197 if (ib_send_cm_drep(cm_id, NULL, 0))
1198 printk(KERN_ERR PFX "Sending CM DREP failed\n");
1199 break;
1200
1201 case IB_CM_TIMEWAIT_EXIT:
1202 printk(KERN_ERR PFX "connection closed\n");
1203
1204 comp = 1;
1205 target->status = 0;
1206 break;
1207
1208 case IB_CM_MRA_RECEIVED:
1209 case IB_CM_DREQ_ERROR:
1210 case IB_CM_DREP_RECEIVED:
1211 break;
1212
1213 default:
1214 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1215 break;
1216 }
1217
1218 if (comp)
1219 complete(&target->done);
1220
1221 kfree(qp_attr);
1222
1223 return 0;
1224 }
1225
1226 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1227 struct srp_request *req, u8 func)
1228 {
1229 struct srp_iu *iu;
1230 struct srp_tsk_mgmt *tsk_mgmt;
1231
1232 spin_lock_irq(target->scsi_host->host_lock);
1233
1234 if (target->state == SRP_TARGET_DEAD ||
1235 target->state == SRP_TARGET_REMOVED) {
1236 req->scmnd->result = DID_BAD_TARGET << 16;
1237 goto out;
1238 }
1239
1240 init_completion(&req->done);
1241
1242 iu = __srp_get_tx_iu(target);
1243 if (!iu)
1244 goto out;
1245
1246 tsk_mgmt = iu->buf;
1247 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1248
1249 tsk_mgmt->opcode = SRP_TSK_MGMT;
1250 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1251 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1252 tsk_mgmt->tsk_mgmt_func = func;
1253 tsk_mgmt->task_tag = req->index;
1254
1255 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1256 goto out;
1257
1258 req->tsk_mgmt = iu;
1259
1260 spin_unlock_irq(target->scsi_host->host_lock);
1261
1262 if (!wait_for_completion_timeout(&req->done,
1263 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1264 return -1;
1265
1266 return 0;
1267
1268 out:
1269 spin_unlock_irq(target->scsi_host->host_lock);
1270 return -1;
1271 }
1272
1273 static int srp_find_req(struct srp_target_port *target,
1274 struct scsi_cmnd *scmnd,
1275 struct srp_request **req)
1276 {
1277 if (scmnd->host_scribble == (void *) -1L)
1278 return -1;
1279
1280 *req = &target->req_ring[(long) scmnd->host_scribble];
1281
1282 return 0;
1283 }
1284
1285 static int srp_abort(struct scsi_cmnd *scmnd)
1286 {
1287 struct srp_target_port *target = host_to_target(scmnd->device->host);
1288 struct srp_request *req;
1289 int ret = SUCCESS;
1290
1291 printk(KERN_ERR "SRP abort called\n");
1292
1293 if (srp_find_req(target, scmnd, &req))
1294 return FAILED;
1295 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1296 return FAILED;
1297
1298 spin_lock_irq(target->scsi_host->host_lock);
1299
1300 if (req->cmd_done) {
1301 srp_remove_req(target, req);
1302 scmnd->scsi_done(scmnd);
1303 } else if (!req->tsk_status) {
1304 srp_remove_req(target, req);
1305 scmnd->result = DID_ABORT << 16;
1306 } else
1307 ret = FAILED;
1308
1309 spin_unlock_irq(target->scsi_host->host_lock);
1310
1311 return ret;
1312 }
1313
1314 static int srp_reset_device(struct scsi_cmnd *scmnd)
1315 {
1316 struct srp_target_port *target = host_to_target(scmnd->device->host);
1317 struct srp_request *req, *tmp;
1318
1319 printk(KERN_ERR "SRP reset_device called\n");
1320
1321 if (srp_find_req(target, scmnd, &req))
1322 return FAILED;
1323 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1324 return FAILED;
1325 if (req->tsk_status)
1326 return FAILED;
1327
1328 spin_lock_irq(target->scsi_host->host_lock);
1329
1330 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1331 if (req->scmnd->device == scmnd->device) {
1332 req->scmnd->result = DID_RESET << 16;
1333 req->scmnd->scsi_done(req->scmnd);
1334 srp_remove_req(target, req);
1335 }
1336
1337 spin_unlock_irq(target->scsi_host->host_lock);
1338
1339 return SUCCESS;
1340 }
1341
1342 static int srp_reset_host(struct scsi_cmnd *scmnd)
1343 {
1344 struct srp_target_port *target = host_to_target(scmnd->device->host);
1345 int ret = FAILED;
1346
1347 printk(KERN_ERR PFX "SRP reset_host called\n");
1348
1349 if (!srp_reconnect_target(target))
1350 ret = SUCCESS;
1351
1352 return ret;
1353 }
1354
1355 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1356 {
1357 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1358
1359 if (target->state == SRP_TARGET_DEAD ||
1360 target->state == SRP_TARGET_REMOVED)
1361 return -ENODEV;
1362
1363 return sprintf(buf, "0x%016llx\n",
1364 (unsigned long long) be64_to_cpu(target->id_ext));
1365 }
1366
1367 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1368 {
1369 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1370
1371 if (target->state == SRP_TARGET_DEAD ||
1372 target->state == SRP_TARGET_REMOVED)
1373 return -ENODEV;
1374
1375 return sprintf(buf, "0x%016llx\n",
1376 (unsigned long long) be64_to_cpu(target->ioc_guid));
1377 }
1378
1379 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1380 {
1381 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1382
1383 if (target->state == SRP_TARGET_DEAD ||
1384 target->state == SRP_TARGET_REMOVED)
1385 return -ENODEV;
1386
1387 return sprintf(buf, "0x%016llx\n",
1388 (unsigned long long) be64_to_cpu(target->service_id));
1389 }
1390
1391 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1392 {
1393 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1394
1395 if (target->state == SRP_TARGET_DEAD ||
1396 target->state == SRP_TARGET_REMOVED)
1397 return -ENODEV;
1398
1399 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1400 }
1401
1402 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1403 {
1404 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1405
1406 if (target->state == SRP_TARGET_DEAD ||
1407 target->state == SRP_TARGET_REMOVED)
1408 return -ENODEV;
1409
1410 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1411 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1412 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1413 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1414 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1415 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1416 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1417 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1418 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1419 }
1420
1421 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1422 {
1423 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1424
1425 if (target->state == SRP_TARGET_DEAD ||
1426 target->state == SRP_TARGET_REMOVED)
1427 return -ENODEV;
1428
1429 return sprintf(buf, "%d\n", target->zero_req_lim);
1430 }
1431
1432 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1433 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1434 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1435 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1436 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1437 static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1438
1439 static struct class_device_attribute *srp_host_attrs[] = {
1440 &class_device_attr_id_ext,
1441 &class_device_attr_ioc_guid,
1442 &class_device_attr_service_id,
1443 &class_device_attr_pkey,
1444 &class_device_attr_dgid,
1445 &class_device_attr_zero_req_lim,
1446 NULL
1447 };
1448
1449 static struct scsi_host_template srp_template = {
1450 .module = THIS_MODULE,
1451 .name = DRV_NAME,
1452 .info = srp_target_info,
1453 .queuecommand = srp_queuecommand,
1454 .eh_abort_handler = srp_abort,
1455 .eh_device_reset_handler = srp_reset_device,
1456 .eh_host_reset_handler = srp_reset_host,
1457 .can_queue = SRP_SQ_SIZE,
1458 .this_id = -1,
1459 .cmd_per_lun = SRP_SQ_SIZE,
1460 .use_clustering = ENABLE_CLUSTERING,
1461 .shost_attrs = srp_host_attrs
1462 };
1463
1464 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1465 {
1466 sprintf(target->target_name, "SRP.T10:%016llX",
1467 (unsigned long long) be64_to_cpu(target->id_ext));
1468
1469 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1470 return -ENODEV;
1471
1472 spin_lock(&host->target_lock);
1473 list_add_tail(&target->list, &host->target_list);
1474 spin_unlock(&host->target_lock);
1475
1476 target->state = SRP_TARGET_LIVE;
1477
1478 scsi_scan_target(&target->scsi_host->shost_gendev,
1479 0, target->scsi_id, SCAN_WILD_CARD, 0);
1480
1481 return 0;
1482 }
1483
1484 static void srp_release_class_dev(struct class_device *class_dev)
1485 {
1486 struct srp_host *host =
1487 container_of(class_dev, struct srp_host, class_dev);
1488
1489 complete(&host->released);
1490 }
1491
1492 static struct class srp_class = {
1493 .name = "infiniband_srp",
1494 .release = srp_release_class_dev
1495 };
1496
1497 /*
1498 * Target ports are added by writing
1499 *
1500 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1501 * pkey=<P_Key>,service_id=<service ID>
1502 *
1503 * to the add_target sysfs attribute.
1504 */
1505 enum {
1506 SRP_OPT_ERR = 0,
1507 SRP_OPT_ID_EXT = 1 << 0,
1508 SRP_OPT_IOC_GUID = 1 << 1,
1509 SRP_OPT_DGID = 1 << 2,
1510 SRP_OPT_PKEY = 1 << 3,
1511 SRP_OPT_SERVICE_ID = 1 << 4,
1512 SRP_OPT_MAX_SECT = 1 << 5,
1513 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1514 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1515 SRP_OPT_IOC_GUID |
1516 SRP_OPT_DGID |
1517 SRP_OPT_PKEY |
1518 SRP_OPT_SERVICE_ID),
1519 };
1520
1521 static match_table_t srp_opt_tokens = {
1522 { SRP_OPT_ID_EXT, "id_ext=%s" },
1523 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1524 { SRP_OPT_DGID, "dgid=%s" },
1525 { SRP_OPT_PKEY, "pkey=%x" },
1526 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1527 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1528 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1529 { SRP_OPT_ERR, NULL }
1530 };
1531
1532 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1533 {
1534 char *options, *sep_opt;
1535 char *p;
1536 char dgid[3];
1537 substring_t args[MAX_OPT_ARGS];
1538 int opt_mask = 0;
1539 int token;
1540 int ret = -EINVAL;
1541 int i;
1542
1543 options = kstrdup(buf, GFP_KERNEL);
1544 if (!options)
1545 return -ENOMEM;
1546
1547 sep_opt = options;
1548 while ((p = strsep(&sep_opt, ",")) != NULL) {
1549 if (!*p)
1550 continue;
1551
1552 token = match_token(p, srp_opt_tokens, args);
1553 opt_mask |= token;
1554
1555 switch (token) {
1556 case SRP_OPT_ID_EXT:
1557 p = match_strdup(args);
1558 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1559 kfree(p);
1560 break;
1561
1562 case SRP_OPT_IOC_GUID:
1563 p = match_strdup(args);
1564 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1565 kfree(p);
1566 break;
1567
1568 case SRP_OPT_DGID:
1569 p = match_strdup(args);
1570 if (strlen(p) != 32) {
1571 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1572 kfree(p);
1573 goto out;
1574 }
1575
1576 for (i = 0; i < 16; ++i) {
1577 strlcpy(dgid, p + i * 2, 3);
1578 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1579 }
1580 kfree(p);
1581 break;
1582
1583 case SRP_OPT_PKEY:
1584 if (match_hex(args, &token)) {
1585 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1586 goto out;
1587 }
1588 target->path.pkey = cpu_to_be16(token);
1589 break;
1590
1591 case SRP_OPT_SERVICE_ID:
1592 p = match_strdup(args);
1593 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1594 kfree(p);
1595 break;
1596
1597 case SRP_OPT_MAX_SECT:
1598 if (match_int(args, &token)) {
1599 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1600 goto out;
1601 }
1602 target->scsi_host->max_sectors = token;
1603 break;
1604
1605 case SRP_OPT_MAX_CMD_PER_LUN:
1606 if (match_int(args, &token)) {
1607 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1608 goto out;
1609 }
1610 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1611 break;
1612
1613 default:
1614 printk(KERN_WARNING PFX "unknown parameter or missing value "
1615 "'%s' in target creation request\n", p);
1616 goto out;
1617 }
1618 }
1619
1620 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1621 ret = 0;
1622 else
1623 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1624 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1625 !(srp_opt_tokens[i].token & opt_mask))
1626 printk(KERN_WARNING PFX "target creation request is "
1627 "missing parameter '%s'\n",
1628 srp_opt_tokens[i].pattern);
1629
1630 out:
1631 kfree(options);
1632 return ret;
1633 }
1634
1635 static ssize_t srp_create_target(struct class_device *class_dev,
1636 const char *buf, size_t count)
1637 {
1638 struct srp_host *host =
1639 container_of(class_dev, struct srp_host, class_dev);
1640 struct Scsi_Host *target_host;
1641 struct srp_target_port *target;
1642 int ret;
1643 int i;
1644
1645 target_host = scsi_host_alloc(&srp_template,
1646 sizeof (struct srp_target_port));
1647 if (!target_host)
1648 return -ENOMEM;
1649
1650 target_host->max_lun = SRP_MAX_LUN;
1651
1652 target = host_to_target(target_host);
1653 memset(target, 0, sizeof *target);
1654
1655 target->scsi_host = target_host;
1656 target->srp_host = host;
1657
1658 INIT_WORK(&target->work, srp_reconnect_work, target);
1659
1660 INIT_LIST_HEAD(&target->free_reqs);
1661 INIT_LIST_HEAD(&target->req_queue);
1662 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1663 target->req_ring[i].index = i;
1664 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1665 }
1666
1667 ret = srp_parse_options(buf, target);
1668 if (ret)
1669 goto err;
1670
1671 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1672
1673 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1674 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1675 (unsigned long long) be64_to_cpu(target->id_ext),
1676 (unsigned long long) be64_to_cpu(target->ioc_guid),
1677 be16_to_cpu(target->path.pkey),
1678 (unsigned long long) be64_to_cpu(target->service_id),
1679 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1680 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1681 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1682 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1683 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1684 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1685 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1686 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1687
1688 ret = srp_create_target_ib(target);
1689 if (ret)
1690 goto err;
1691
1692 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1693 if (IS_ERR(target->cm_id)) {
1694 ret = PTR_ERR(target->cm_id);
1695 goto err_free;
1696 }
1697
1698 ret = srp_connect_target(target);
1699 if (ret) {
1700 printk(KERN_ERR PFX "Connection failed\n");
1701 goto err_cm_id;
1702 }
1703
1704 ret = srp_add_target(host, target);
1705 if (ret)
1706 goto err_disconnect;
1707
1708 return count;
1709
1710 err_disconnect:
1711 srp_disconnect_target(target);
1712
1713 err_cm_id:
1714 ib_destroy_cm_id(target->cm_id);
1715
1716 err_free:
1717 srp_free_target_ib(target);
1718
1719 err:
1720 scsi_host_put(target_host);
1721
1722 return ret;
1723 }
1724
1725 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1726
1727 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1728 {
1729 struct srp_host *host =
1730 container_of(class_dev, struct srp_host, class_dev);
1731
1732 return sprintf(buf, "%s\n", host->dev->dev->name);
1733 }
1734
1735 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1736
1737 static ssize_t show_port(struct class_device *class_dev, char *buf)
1738 {
1739 struct srp_host *host =
1740 container_of(class_dev, struct srp_host, class_dev);
1741
1742 return sprintf(buf, "%d\n", host->port);
1743 }
1744
1745 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1746
1747 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1748 {
1749 struct srp_host *host;
1750
1751 host = kzalloc(sizeof *host, GFP_KERNEL);
1752 if (!host)
1753 return NULL;
1754
1755 INIT_LIST_HEAD(&host->target_list);
1756 spin_lock_init(&host->target_lock);
1757 init_completion(&host->released);
1758 host->dev = device;
1759 host->port = port;
1760
1761 host->initiator_port_id[7] = port;
1762 memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8);
1763
1764 host->class_dev.class = &srp_class;
1765 host->class_dev.dev = device->dev->dma_device;
1766 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1767 device->dev->name, port);
1768
1769 if (class_device_register(&host->class_dev))
1770 goto free_host;
1771 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1772 goto err_class;
1773 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1774 goto err_class;
1775 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1776 goto err_class;
1777
1778 return host;
1779
1780 err_class:
1781 class_device_unregister(&host->class_dev);
1782
1783 free_host:
1784 kfree(host);
1785
1786 return NULL;
1787 }
1788
1789 static void srp_add_one(struct ib_device *device)
1790 {
1791 struct srp_device *srp_dev;
1792 struct ib_device_attr *dev_attr;
1793 struct ib_fmr_pool_param fmr_param;
1794 struct srp_host *host;
1795 int s, e, p;
1796
1797 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1798 if (!dev_attr)
1799 return;
1800
1801 if (ib_query_device(device, dev_attr)) {
1802 printk(KERN_WARNING PFX "Query device failed for %s\n",
1803 device->name);
1804 goto free_attr;
1805 }
1806
1807 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1808 if (!srp_dev)
1809 goto free_attr;
1810
1811 /*
1812 * Use the smallest page size supported by the HCA, down to a
1813 * minimum of 512 bytes (which is the smallest sector that a
1814 * SCSI command will ever carry).
1815 */
1816 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1817 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
1818 srp_dev->fmr_page_mask = ~((unsigned long) srp_dev->fmr_page_size - 1);
1819
1820 INIT_LIST_HEAD(&srp_dev->dev_list);
1821
1822 srp_dev->dev = device;
1823 srp_dev->pd = ib_alloc_pd(device);
1824 if (IS_ERR(srp_dev->pd))
1825 goto free_dev;
1826
1827 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1828 IB_ACCESS_LOCAL_WRITE |
1829 IB_ACCESS_REMOTE_READ |
1830 IB_ACCESS_REMOTE_WRITE);
1831 if (IS_ERR(srp_dev->mr))
1832 goto err_pd;
1833
1834 memset(&fmr_param, 0, sizeof fmr_param);
1835 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
1836 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
1837 fmr_param.cache = 1;
1838 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1839 fmr_param.page_shift = srp_dev->fmr_page_shift;
1840 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
1841 IB_ACCESS_REMOTE_WRITE |
1842 IB_ACCESS_REMOTE_READ);
1843
1844 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1845 if (IS_ERR(srp_dev->fmr_pool))
1846 srp_dev->fmr_pool = NULL;
1847
1848 if (device->node_type == IB_NODE_SWITCH) {
1849 s = 0;
1850 e = 0;
1851 } else {
1852 s = 1;
1853 e = device->phys_port_cnt;
1854 }
1855
1856 for (p = s; p <= e; ++p) {
1857 host = srp_add_port(srp_dev, p);
1858 if (host)
1859 list_add_tail(&host->list, &srp_dev->dev_list);
1860 }
1861
1862 ib_set_client_data(device, &srp_client, srp_dev);
1863
1864 goto free_attr;
1865
1866 err_pd:
1867 ib_dealloc_pd(srp_dev->pd);
1868
1869 free_dev:
1870 kfree(srp_dev);
1871
1872 free_attr:
1873 kfree(dev_attr);
1874 }
1875
1876 static void srp_remove_one(struct ib_device *device)
1877 {
1878 struct srp_device *srp_dev;
1879 struct srp_host *host, *tmp_host;
1880 LIST_HEAD(target_list);
1881 struct srp_target_port *target, *tmp_target;
1882
1883 srp_dev = ib_get_client_data(device, &srp_client);
1884
1885 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1886 class_device_unregister(&host->class_dev);
1887 /*
1888 * Wait for the sysfs entry to go away, so that no new
1889 * target ports can be created.
1890 */
1891 wait_for_completion(&host->released);
1892
1893 /*
1894 * Mark all target ports as removed, so we stop queueing
1895 * commands and don't try to reconnect.
1896 */
1897 spin_lock(&host->target_lock);
1898 list_for_each_entry(target, &host->target_list, list) {
1899 spin_lock_irq(target->scsi_host->host_lock);
1900 target->state = SRP_TARGET_REMOVED;
1901 spin_unlock_irq(target->scsi_host->host_lock);
1902 }
1903 spin_unlock(&host->target_lock);
1904
1905 /*
1906 * Wait for any reconnection tasks that may have
1907 * started before we marked our target ports as
1908 * removed, and any target port removal tasks.
1909 */
1910 flush_scheduled_work();
1911
1912 list_for_each_entry_safe(target, tmp_target,
1913 &host->target_list, list) {
1914 scsi_remove_host(target->scsi_host);
1915 srp_disconnect_target(target);
1916 ib_destroy_cm_id(target->cm_id);
1917 srp_free_target_ib(target);
1918 scsi_host_put(target->scsi_host);
1919 }
1920
1921 kfree(host);
1922 }
1923
1924 if (srp_dev->fmr_pool)
1925 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1926 ib_dereg_mr(srp_dev->mr);
1927 ib_dealloc_pd(srp_dev->pd);
1928
1929 kfree(srp_dev);
1930 }
1931
1932 static int __init srp_init_module(void)
1933 {
1934 int ret;
1935
1936 srp_template.sg_tablesize = srp_sg_tablesize;
1937 srp_max_iu_len = (sizeof (struct srp_cmd) +
1938 sizeof (struct srp_indirect_buf) +
1939 srp_sg_tablesize * 16);
1940
1941 ret = class_register(&srp_class);
1942 if (ret) {
1943 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1944 return ret;
1945 }
1946
1947 ret = ib_register_client(&srp_client);
1948 if (ret) {
1949 printk(KERN_ERR PFX "couldn't register IB client\n");
1950 class_unregister(&srp_class);
1951 return ret;
1952 }
1953
1954 return 0;
1955 }
1956
1957 static void __exit srp_cleanup_module(void)
1958 {
1959 ib_unregister_client(&srp_client);
1960 class_unregister(&srp_class);
1961 }
1962
1963 module_init(srp_init_module);
1964 module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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