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[mirror_ubuntu-zesty-kernel.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 int mellanox_workarounds = 1;
81
82 module_param(mellanox_workarounds, int, 0444);
83 MODULE_PARM_DESC(mellanox_workarounds,
84 "Enable workarounds for Mellanox SRP target bugs if != 0");
85
86 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
87
88 static void srp_add_one(struct ib_device *device);
89 static void srp_remove_one(struct ib_device *device);
90 static void srp_completion(struct ib_cq *cq, void *target_ptr);
91 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
92
93 static struct ib_client srp_client = {
94 .name = "srp",
95 .add = srp_add_one,
96 .remove = srp_remove_one
97 };
98
99 static struct ib_sa_client srp_sa_client;
100
101 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
102 {
103 return (struct srp_target_port *) host->hostdata;
104 }
105
106 static const char *srp_target_info(struct Scsi_Host *host)
107 {
108 return host_to_target(host)->target_name;
109 }
110
111 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
112 gfp_t gfp_mask,
113 enum dma_data_direction direction)
114 {
115 struct srp_iu *iu;
116
117 iu = kmalloc(sizeof *iu, gfp_mask);
118 if (!iu)
119 goto out;
120
121 iu->buf = kzalloc(size, gfp_mask);
122 if (!iu->buf)
123 goto out_free_iu;
124
125 iu->dma = dma_map_single(host->dev->dev->dma_device,
126 iu->buf, size, direction);
127 if (dma_mapping_error(iu->dma))
128 goto out_free_buf;
129
130 iu->size = size;
131 iu->direction = direction;
132
133 return iu;
134
135 out_free_buf:
136 kfree(iu->buf);
137 out_free_iu:
138 kfree(iu);
139 out:
140 return NULL;
141 }
142
143 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
144 {
145 if (!iu)
146 return;
147
148 dma_unmap_single(host->dev->dev->dma_device,
149 iu->dma, iu->size, iu->direction);
150 kfree(iu->buf);
151 kfree(iu);
152 }
153
154 static void srp_qp_event(struct ib_event *event, void *context)
155 {
156 printk(KERN_ERR PFX "QP event %d\n", event->event);
157 }
158
159 static int srp_init_qp(struct srp_target_port *target,
160 struct ib_qp *qp)
161 {
162 struct ib_qp_attr *attr;
163 int ret;
164
165 attr = kmalloc(sizeof *attr, GFP_KERNEL);
166 if (!attr)
167 return -ENOMEM;
168
169 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
170 target->srp_host->port,
171 be16_to_cpu(target->path.pkey),
172 &attr->pkey_index);
173 if (ret)
174 goto out;
175
176 attr->qp_state = IB_QPS_INIT;
177 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
178 IB_ACCESS_REMOTE_WRITE);
179 attr->port_num = target->srp_host->port;
180
181 ret = ib_modify_qp(qp, attr,
182 IB_QP_STATE |
183 IB_QP_PKEY_INDEX |
184 IB_QP_ACCESS_FLAGS |
185 IB_QP_PORT);
186
187 out:
188 kfree(attr);
189 return ret;
190 }
191
192 static int srp_create_target_ib(struct srp_target_port *target)
193 {
194 struct ib_qp_init_attr *init_attr;
195 int ret;
196
197 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
198 if (!init_attr)
199 return -ENOMEM;
200
201 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
202 NULL, target, SRP_CQ_SIZE);
203 if (IS_ERR(target->cq)) {
204 ret = PTR_ERR(target->cq);
205 goto out;
206 }
207
208 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
209
210 init_attr->event_handler = srp_qp_event;
211 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
212 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
213 init_attr->cap.max_recv_sge = 1;
214 init_attr->cap.max_send_sge = 1;
215 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
216 init_attr->qp_type = IB_QPT_RC;
217 init_attr->send_cq = target->cq;
218 init_attr->recv_cq = target->cq;
219
220 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
221 if (IS_ERR(target->qp)) {
222 ret = PTR_ERR(target->qp);
223 ib_destroy_cq(target->cq);
224 goto out;
225 }
226
227 ret = srp_init_qp(target, target->qp);
228 if (ret) {
229 ib_destroy_qp(target->qp);
230 ib_destroy_cq(target->cq);
231 goto out;
232 }
233
234 out:
235 kfree(init_attr);
236 return ret;
237 }
238
239 static void srp_free_target_ib(struct srp_target_port *target)
240 {
241 int i;
242
243 ib_destroy_qp(target->qp);
244 ib_destroy_cq(target->cq);
245
246 for (i = 0; i < SRP_RQ_SIZE; ++i)
247 srp_free_iu(target->srp_host, target->rx_ring[i]);
248 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
249 srp_free_iu(target->srp_host, target->tx_ring[i]);
250 }
251
252 static void srp_path_rec_completion(int status,
253 struct ib_sa_path_rec *pathrec,
254 void *target_ptr)
255 {
256 struct srp_target_port *target = target_ptr;
257
258 target->status = status;
259 if (status)
260 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
261 else
262 target->path = *pathrec;
263 complete(&target->done);
264 }
265
266 static int srp_lookup_path(struct srp_target_port *target)
267 {
268 target->path.numb_path = 1;
269
270 init_completion(&target->done);
271
272 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
273 target->srp_host->dev->dev,
274 target->srp_host->port,
275 &target->path,
276 IB_SA_PATH_REC_DGID |
277 IB_SA_PATH_REC_SGID |
278 IB_SA_PATH_REC_NUMB_PATH |
279 IB_SA_PATH_REC_PKEY,
280 SRP_PATH_REC_TIMEOUT_MS,
281 GFP_KERNEL,
282 srp_path_rec_completion,
283 target, &target->path_query);
284 if (target->path_query_id < 0)
285 return target->path_query_id;
286
287 wait_for_completion(&target->done);
288
289 if (target->status < 0)
290 printk(KERN_WARNING PFX "Path record query failed\n");
291
292 return target->status;
293 }
294
295 static int srp_send_req(struct srp_target_port *target)
296 {
297 struct {
298 struct ib_cm_req_param param;
299 struct srp_login_req priv;
300 } *req = NULL;
301 int status;
302
303 req = kzalloc(sizeof *req, GFP_KERNEL);
304 if (!req)
305 return -ENOMEM;
306
307 req->param.primary_path = &target->path;
308 req->param.alternate_path = NULL;
309 req->param.service_id = target->service_id;
310 req->param.qp_num = target->qp->qp_num;
311 req->param.qp_type = target->qp->qp_type;
312 req->param.private_data = &req->priv;
313 req->param.private_data_len = sizeof req->priv;
314 req->param.flow_control = 1;
315
316 get_random_bytes(&req->param.starting_psn, 4);
317 req->param.starting_psn &= 0xffffff;
318
319 /*
320 * Pick some arbitrary defaults here; we could make these
321 * module parameters if anyone cared about setting them.
322 */
323 req->param.responder_resources = 4;
324 req->param.remote_cm_response_timeout = 20;
325 req->param.local_cm_response_timeout = 20;
326 req->param.retry_count = 7;
327 req->param.rnr_retry_count = 7;
328 req->param.max_cm_retries = 15;
329
330 req->priv.opcode = SRP_LOGIN_REQ;
331 req->priv.tag = 0;
332 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
333 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
334 SRP_BUF_FORMAT_INDIRECT);
335 /*
336 * In the published SRP specification (draft rev. 16a), the
337 * port identifier format is 8 bytes of ID extension followed
338 * by 8 bytes of GUID. Older drafts put the two halves in the
339 * opposite order, so that the GUID comes first.
340 *
341 * Targets conforming to these obsolete drafts can be
342 * recognized by the I/O Class they report.
343 */
344 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
345 memcpy(req->priv.initiator_port_id,
346 &target->path.sgid.global.interface_id, 8);
347 memcpy(req->priv.initiator_port_id + 8,
348 &target->initiator_ext, 8);
349 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
350 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
351 } else {
352 memcpy(req->priv.initiator_port_id,
353 &target->initiator_ext, 8);
354 memcpy(req->priv.initiator_port_id + 8,
355 &target->path.sgid.global.interface_id, 8);
356 memcpy(req->priv.target_port_id, &target->id_ext, 8);
357 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
358 }
359
360 /*
361 * Topspin/Cisco SRP targets will reject our login unless we
362 * zero out the first 8 bytes of our initiator port ID and set
363 * the second 8 bytes to the local node GUID.
364 */
365 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
366 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
367 "activated for target GUID %016llx\n",
368 (unsigned long long) be64_to_cpu(target->ioc_guid));
369 memset(req->priv.initiator_port_id, 0, 8);
370 memcpy(req->priv.initiator_port_id + 8,
371 &target->srp_host->dev->dev->node_guid, 8);
372 }
373
374 status = ib_send_cm_req(target->cm_id, &req->param);
375
376 kfree(req);
377
378 return status;
379 }
380
381 static void srp_disconnect_target(struct srp_target_port *target)
382 {
383 /* XXX should send SRP_I_LOGOUT request */
384
385 init_completion(&target->done);
386 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
387 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
388 return;
389 }
390 wait_for_completion(&target->done);
391 }
392
393 static void srp_remove_work(struct work_struct *work)
394 {
395 struct srp_target_port *target =
396 container_of(work, struct srp_target_port, work);
397
398 spin_lock_irq(target->scsi_host->host_lock);
399 if (target->state != SRP_TARGET_DEAD) {
400 spin_unlock_irq(target->scsi_host->host_lock);
401 return;
402 }
403 target->state = SRP_TARGET_REMOVED;
404 spin_unlock_irq(target->scsi_host->host_lock);
405
406 spin_lock(&target->srp_host->target_lock);
407 list_del(&target->list);
408 spin_unlock(&target->srp_host->target_lock);
409
410 scsi_remove_host(target->scsi_host);
411 ib_destroy_cm_id(target->cm_id);
412 srp_free_target_ib(target);
413 scsi_host_put(target->scsi_host);
414 }
415
416 static int srp_connect_target(struct srp_target_port *target)
417 {
418 int ret;
419
420 ret = srp_lookup_path(target);
421 if (ret)
422 return ret;
423
424 while (1) {
425 init_completion(&target->done);
426 ret = srp_send_req(target);
427 if (ret)
428 return ret;
429 wait_for_completion(&target->done);
430
431 /*
432 * The CM event handling code will set status to
433 * SRP_PORT_REDIRECT if we get a port redirect REJ
434 * back, or SRP_DLID_REDIRECT if we get a lid/qp
435 * redirect REJ back.
436 */
437 switch (target->status) {
438 case 0:
439 return 0;
440
441 case SRP_PORT_REDIRECT:
442 ret = srp_lookup_path(target);
443 if (ret)
444 return ret;
445 break;
446
447 case SRP_DLID_REDIRECT:
448 break;
449
450 default:
451 return target->status;
452 }
453 }
454 }
455
456 static void srp_unmap_data(struct scsi_cmnd *scmnd,
457 struct srp_target_port *target,
458 struct srp_request *req)
459 {
460 struct scatterlist *scat;
461 int nents;
462
463 if (!scmnd->request_buffer ||
464 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
465 scmnd->sc_data_direction != DMA_FROM_DEVICE))
466 return;
467
468 if (req->fmr) {
469 ib_fmr_pool_unmap(req->fmr);
470 req->fmr = NULL;
471 }
472
473 /*
474 * This handling of non-SG commands can be killed when the
475 * SCSI midlayer no longer generates non-SG commands.
476 */
477 if (likely(scmnd->use_sg)) {
478 nents = scmnd->use_sg;
479 scat = scmnd->request_buffer;
480 } else {
481 nents = 1;
482 scat = &req->fake_sg;
483 }
484
485 dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
486 scmnd->sc_data_direction);
487 }
488
489 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
490 {
491 srp_unmap_data(req->scmnd, target, req);
492 list_move_tail(&req->list, &target->free_reqs);
493 }
494
495 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
496 {
497 req->scmnd->result = DID_RESET << 16;
498 req->scmnd->scsi_done(req->scmnd);
499 srp_remove_req(target, req);
500 }
501
502 static int srp_reconnect_target(struct srp_target_port *target)
503 {
504 struct ib_cm_id *new_cm_id;
505 struct ib_qp_attr qp_attr;
506 struct srp_request *req, *tmp;
507 struct ib_wc wc;
508 int ret;
509
510 spin_lock_irq(target->scsi_host->host_lock);
511 if (target->state != SRP_TARGET_LIVE) {
512 spin_unlock_irq(target->scsi_host->host_lock);
513 return -EAGAIN;
514 }
515 target->state = SRP_TARGET_CONNECTING;
516 spin_unlock_irq(target->scsi_host->host_lock);
517
518 srp_disconnect_target(target);
519 /*
520 * Now get a new local CM ID so that we avoid confusing the
521 * target in case things are really fouled up.
522 */
523 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
524 srp_cm_handler, target);
525 if (IS_ERR(new_cm_id)) {
526 ret = PTR_ERR(new_cm_id);
527 goto err;
528 }
529 ib_destroy_cm_id(target->cm_id);
530 target->cm_id = new_cm_id;
531
532 qp_attr.qp_state = IB_QPS_RESET;
533 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
534 if (ret)
535 goto err;
536
537 ret = srp_init_qp(target, target->qp);
538 if (ret)
539 goto err;
540
541 while (ib_poll_cq(target->cq, 1, &wc) > 0)
542 ; /* nothing */
543
544 spin_lock_irq(target->scsi_host->host_lock);
545 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
546 srp_reset_req(target, req);
547 spin_unlock_irq(target->scsi_host->host_lock);
548
549 target->rx_head = 0;
550 target->tx_head = 0;
551 target->tx_tail = 0;
552
553 ret = srp_connect_target(target);
554 if (ret)
555 goto err;
556
557 spin_lock_irq(target->scsi_host->host_lock);
558 if (target->state == SRP_TARGET_CONNECTING) {
559 ret = 0;
560 target->state = SRP_TARGET_LIVE;
561 } else
562 ret = -EAGAIN;
563 spin_unlock_irq(target->scsi_host->host_lock);
564
565 return ret;
566
567 err:
568 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
569
570 /*
571 * We couldn't reconnect, so kill our target port off.
572 * However, we have to defer the real removal because we might
573 * be in the context of the SCSI error handler now, which
574 * would deadlock if we call scsi_remove_host().
575 */
576 spin_lock_irq(target->scsi_host->host_lock);
577 if (target->state == SRP_TARGET_CONNECTING) {
578 target->state = SRP_TARGET_DEAD;
579 INIT_WORK(&target->work, srp_remove_work);
580 schedule_work(&target->work);
581 }
582 spin_unlock_irq(target->scsi_host->host_lock);
583
584 return ret;
585 }
586
587 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
588 int sg_cnt, struct srp_request *req,
589 struct srp_direct_buf *buf)
590 {
591 u64 io_addr = 0;
592 u64 *dma_pages;
593 u32 len;
594 int page_cnt;
595 int i, j;
596 int ret;
597 struct srp_device *dev = target->srp_host->dev;
598
599 if (!dev->fmr_pool)
600 return -ENODEV;
601
602 if ((sg_dma_address(&scat[0]) & ~dev->fmr_page_mask) &&
603 mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3))
604 return -EINVAL;
605
606 len = page_cnt = 0;
607 for (i = 0; i < sg_cnt; ++i) {
608 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
609 if (i > 0)
610 return -EINVAL;
611 else
612 ++page_cnt;
613 }
614 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
615 ~dev->fmr_page_mask) {
616 if (i < sg_cnt - 1)
617 return -EINVAL;
618 else
619 ++page_cnt;
620 }
621
622 len += sg_dma_len(&scat[i]);
623 }
624
625 page_cnt += len >> dev->fmr_page_shift;
626 if (page_cnt > SRP_FMR_SIZE)
627 return -ENOMEM;
628
629 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
630 if (!dma_pages)
631 return -ENOMEM;
632
633 page_cnt = 0;
634 for (i = 0; i < sg_cnt; ++i)
635 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
636 dma_pages[page_cnt++] =
637 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
638
639 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
640 dma_pages, page_cnt, io_addr);
641 if (IS_ERR(req->fmr)) {
642 ret = PTR_ERR(req->fmr);
643 req->fmr = NULL;
644 goto out;
645 }
646
647 buf->va = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
648 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
649 buf->len = cpu_to_be32(len);
650
651 ret = 0;
652
653 out:
654 kfree(dma_pages);
655
656 return ret;
657 }
658
659 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
660 struct srp_request *req)
661 {
662 struct scatterlist *scat;
663 struct srp_cmd *cmd = req->cmd->buf;
664 int len, nents, count;
665 u8 fmt = SRP_DATA_DESC_DIRECT;
666
667 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
668 return sizeof (struct srp_cmd);
669
670 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
671 scmnd->sc_data_direction != DMA_TO_DEVICE) {
672 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
673 scmnd->sc_data_direction);
674 return -EINVAL;
675 }
676
677 /*
678 * This handling of non-SG commands can be killed when the
679 * SCSI midlayer no longer generates non-SG commands.
680 */
681 if (likely(scmnd->use_sg)) {
682 nents = scmnd->use_sg;
683 scat = scmnd->request_buffer;
684 } else {
685 nents = 1;
686 scat = &req->fake_sg;
687 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
688 }
689
690 count = dma_map_sg(target->srp_host->dev->dev->dma_device,
691 scat, nents, scmnd->sc_data_direction);
692
693 fmt = SRP_DATA_DESC_DIRECT;
694 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
695
696 if (count == 1) {
697 /*
698 * The midlayer only generated a single gather/scatter
699 * entry, or DMA mapping coalesced everything to a
700 * single entry. So a direct descriptor along with
701 * the DMA MR suffices.
702 */
703 struct srp_direct_buf *buf = (void *) cmd->add_data;
704
705 buf->va = cpu_to_be64(sg_dma_address(scat));
706 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
707 buf->len = cpu_to_be32(sg_dma_len(scat));
708 } else if (srp_map_fmr(target, scat, count, req,
709 (void *) cmd->add_data)) {
710 /*
711 * FMR mapping failed, and the scatterlist has more
712 * than one entry. Generate an indirect memory
713 * descriptor.
714 */
715 struct srp_indirect_buf *buf = (void *) cmd->add_data;
716 u32 datalen = 0;
717 int i;
718
719 fmt = SRP_DATA_DESC_INDIRECT;
720 len = sizeof (struct srp_cmd) +
721 sizeof (struct srp_indirect_buf) +
722 count * sizeof (struct srp_direct_buf);
723
724 for (i = 0; i < count; ++i) {
725 buf->desc_list[i].va =
726 cpu_to_be64(sg_dma_address(&scat[i]));
727 buf->desc_list[i].key =
728 cpu_to_be32(target->srp_host->dev->mr->rkey);
729 buf->desc_list[i].len =
730 cpu_to_be32(sg_dma_len(&scat[i]));
731 datalen += sg_dma_len(&scat[i]);
732 }
733
734 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
735 cmd->data_out_desc_cnt = count;
736 else
737 cmd->data_in_desc_cnt = count;
738
739 buf->table_desc.va =
740 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
741 buf->table_desc.key =
742 cpu_to_be32(target->srp_host->dev->mr->rkey);
743 buf->table_desc.len =
744 cpu_to_be32(count * sizeof (struct srp_direct_buf));
745
746 buf->len = cpu_to_be32(datalen);
747 }
748
749 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
750 cmd->buf_fmt = fmt << 4;
751 else
752 cmd->buf_fmt = fmt;
753
754 return len;
755 }
756
757 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
758 {
759 struct srp_request *req;
760 struct scsi_cmnd *scmnd;
761 unsigned long flags;
762 s32 delta;
763
764 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
765
766 spin_lock_irqsave(target->scsi_host->host_lock, flags);
767
768 target->req_lim += delta;
769
770 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
771
772 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
773 if (be32_to_cpu(rsp->resp_data_len) < 4)
774 req->tsk_status = -1;
775 else
776 req->tsk_status = rsp->data[3];
777 complete(&req->done);
778 } else {
779 scmnd = req->scmnd;
780 if (!scmnd)
781 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
782 (unsigned long long) rsp->tag);
783 scmnd->result = rsp->status;
784
785 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
786 memcpy(scmnd->sense_buffer, rsp->data +
787 be32_to_cpu(rsp->resp_data_len),
788 min_t(int, be32_to_cpu(rsp->sense_data_len),
789 SCSI_SENSE_BUFFERSIZE));
790 }
791
792 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
793 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
794 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
795 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
796
797 if (!req->tsk_mgmt) {
798 scmnd->host_scribble = (void *) -1L;
799 scmnd->scsi_done(scmnd);
800
801 srp_remove_req(target, req);
802 } else
803 req->cmd_done = 1;
804 }
805
806 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
807 }
808
809 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
810 {
811 struct srp_iu *iu;
812 u8 opcode;
813
814 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
815
816 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
817 target->max_ti_iu_len, DMA_FROM_DEVICE);
818
819 opcode = *(u8 *) iu->buf;
820
821 if (0) {
822 int i;
823
824 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
825
826 for (i = 0; i < wc->byte_len; ++i) {
827 if (i % 8 == 0)
828 printk(KERN_ERR " [%02x] ", i);
829 printk(" %02x", ((u8 *) iu->buf)[i]);
830 if ((i + 1) % 8 == 0)
831 printk("\n");
832 }
833
834 if (wc->byte_len % 8)
835 printk("\n");
836 }
837
838 switch (opcode) {
839 case SRP_RSP:
840 srp_process_rsp(target, iu->buf);
841 break;
842
843 case SRP_T_LOGOUT:
844 /* XXX Handle target logout */
845 printk(KERN_WARNING PFX "Got target logout request\n");
846 break;
847
848 default:
849 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
850 break;
851 }
852
853 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
854 target->max_ti_iu_len, DMA_FROM_DEVICE);
855 }
856
857 static void srp_completion(struct ib_cq *cq, void *target_ptr)
858 {
859 struct srp_target_port *target = target_ptr;
860 struct ib_wc wc;
861
862 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
863 while (ib_poll_cq(cq, 1, &wc) > 0) {
864 if (wc.status) {
865 printk(KERN_ERR PFX "failed %s status %d\n",
866 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
867 wc.status);
868 break;
869 }
870
871 if (wc.wr_id & SRP_OP_RECV)
872 srp_handle_recv(target, &wc);
873 else
874 ++target->tx_tail;
875 }
876 }
877
878 static int __srp_post_recv(struct srp_target_port *target)
879 {
880 struct srp_iu *iu;
881 struct ib_sge list;
882 struct ib_recv_wr wr, *bad_wr;
883 unsigned int next;
884 int ret;
885
886 next = target->rx_head & (SRP_RQ_SIZE - 1);
887 wr.wr_id = next | SRP_OP_RECV;
888 iu = target->rx_ring[next];
889
890 list.addr = iu->dma;
891 list.length = iu->size;
892 list.lkey = target->srp_host->dev->mr->lkey;
893
894 wr.next = NULL;
895 wr.sg_list = &list;
896 wr.num_sge = 1;
897
898 ret = ib_post_recv(target->qp, &wr, &bad_wr);
899 if (!ret)
900 ++target->rx_head;
901
902 return ret;
903 }
904
905 static int srp_post_recv(struct srp_target_port *target)
906 {
907 unsigned long flags;
908 int ret;
909
910 spin_lock_irqsave(target->scsi_host->host_lock, flags);
911 ret = __srp_post_recv(target);
912 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
913
914 return ret;
915 }
916
917 /*
918 * Must be called with target->scsi_host->host_lock held to protect
919 * req_lim and tx_head. Lock cannot be dropped between call here and
920 * call to __srp_post_send().
921 */
922 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
923 {
924 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
925 return NULL;
926
927 if (unlikely(target->req_lim < 1))
928 ++target->zero_req_lim;
929
930 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
931 }
932
933 /*
934 * Must be called with target->scsi_host->host_lock held to protect
935 * req_lim and tx_head.
936 */
937 static int __srp_post_send(struct srp_target_port *target,
938 struct srp_iu *iu, int len)
939 {
940 struct ib_sge list;
941 struct ib_send_wr wr, *bad_wr;
942 int ret = 0;
943
944 list.addr = iu->dma;
945 list.length = len;
946 list.lkey = target->srp_host->dev->mr->lkey;
947
948 wr.next = NULL;
949 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
950 wr.sg_list = &list;
951 wr.num_sge = 1;
952 wr.opcode = IB_WR_SEND;
953 wr.send_flags = IB_SEND_SIGNALED;
954
955 ret = ib_post_send(target->qp, &wr, &bad_wr);
956
957 if (!ret) {
958 ++target->tx_head;
959 --target->req_lim;
960 }
961
962 return ret;
963 }
964
965 static int srp_queuecommand(struct scsi_cmnd *scmnd,
966 void (*done)(struct scsi_cmnd *))
967 {
968 struct srp_target_port *target = host_to_target(scmnd->device->host);
969 struct srp_request *req;
970 struct srp_iu *iu;
971 struct srp_cmd *cmd;
972 int len;
973
974 if (target->state == SRP_TARGET_CONNECTING)
975 goto err;
976
977 if (target->state == SRP_TARGET_DEAD ||
978 target->state == SRP_TARGET_REMOVED) {
979 scmnd->result = DID_BAD_TARGET << 16;
980 done(scmnd);
981 return 0;
982 }
983
984 iu = __srp_get_tx_iu(target);
985 if (!iu)
986 goto err;
987
988 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
989 srp_max_iu_len, DMA_TO_DEVICE);
990
991 req = list_entry(target->free_reqs.next, struct srp_request, list);
992
993 scmnd->scsi_done = done;
994 scmnd->result = 0;
995 scmnd->host_scribble = (void *) (long) req->index;
996
997 cmd = iu->buf;
998 memset(cmd, 0, sizeof *cmd);
999
1000 cmd->opcode = SRP_CMD;
1001 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1002 cmd->tag = req->index;
1003 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1004
1005 req->scmnd = scmnd;
1006 req->cmd = iu;
1007 req->cmd_done = 0;
1008 req->tsk_mgmt = NULL;
1009
1010 len = srp_map_data(scmnd, target, req);
1011 if (len < 0) {
1012 printk(KERN_ERR PFX "Failed to map data\n");
1013 goto err;
1014 }
1015
1016 if (__srp_post_recv(target)) {
1017 printk(KERN_ERR PFX "Recv failed\n");
1018 goto err_unmap;
1019 }
1020
1021 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
1022 srp_max_iu_len, DMA_TO_DEVICE);
1023
1024 if (__srp_post_send(target, iu, len)) {
1025 printk(KERN_ERR PFX "Send failed\n");
1026 goto err_unmap;
1027 }
1028
1029 list_move_tail(&req->list, &target->req_queue);
1030
1031 return 0;
1032
1033 err_unmap:
1034 srp_unmap_data(scmnd, target, req);
1035
1036 err:
1037 return SCSI_MLQUEUE_HOST_BUSY;
1038 }
1039
1040 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1041 {
1042 int i;
1043
1044 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1045 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1046 target->max_ti_iu_len,
1047 GFP_KERNEL, DMA_FROM_DEVICE);
1048 if (!target->rx_ring[i])
1049 goto err;
1050 }
1051
1052 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1053 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1054 srp_max_iu_len,
1055 GFP_KERNEL, DMA_TO_DEVICE);
1056 if (!target->tx_ring[i])
1057 goto err;
1058 }
1059
1060 return 0;
1061
1062 err:
1063 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1064 srp_free_iu(target->srp_host, target->rx_ring[i]);
1065 target->rx_ring[i] = NULL;
1066 }
1067
1068 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1069 srp_free_iu(target->srp_host, target->tx_ring[i]);
1070 target->tx_ring[i] = NULL;
1071 }
1072
1073 return -ENOMEM;
1074 }
1075
1076 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1077 struct ib_cm_event *event,
1078 struct srp_target_port *target)
1079 {
1080 struct ib_class_port_info *cpi;
1081 int opcode;
1082
1083 switch (event->param.rej_rcvd.reason) {
1084 case IB_CM_REJ_PORT_CM_REDIRECT:
1085 cpi = event->param.rej_rcvd.ari;
1086 target->path.dlid = cpi->redirect_lid;
1087 target->path.pkey = cpi->redirect_pkey;
1088 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1089 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1090
1091 target->status = target->path.dlid ?
1092 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1093 break;
1094
1095 case IB_CM_REJ_PORT_REDIRECT:
1096 if (topspin_workarounds &&
1097 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1098 /*
1099 * Topspin/Cisco SRP gateways incorrectly send
1100 * reject reason code 25 when they mean 24
1101 * (port redirect).
1102 */
1103 memcpy(target->path.dgid.raw,
1104 event->param.rej_rcvd.ari, 16);
1105
1106 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1107 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1108 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1109
1110 target->status = SRP_PORT_REDIRECT;
1111 } else {
1112 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1113 target->status = -ECONNRESET;
1114 }
1115 break;
1116
1117 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1118 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1119 target->status = -ECONNRESET;
1120 break;
1121
1122 case IB_CM_REJ_CONSUMER_DEFINED:
1123 opcode = *(u8 *) event->private_data;
1124 if (opcode == SRP_LOGIN_REJ) {
1125 struct srp_login_rej *rej = event->private_data;
1126 u32 reason = be32_to_cpu(rej->reason);
1127
1128 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1129 printk(KERN_WARNING PFX
1130 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1131 else
1132 printk(KERN_WARNING PFX
1133 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1134 } else
1135 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1136 " opcode 0x%02x\n", opcode);
1137 target->status = -ECONNRESET;
1138 break;
1139
1140 default:
1141 printk(KERN_WARNING " REJ reason 0x%x\n",
1142 event->param.rej_rcvd.reason);
1143 target->status = -ECONNRESET;
1144 }
1145 }
1146
1147 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1148 {
1149 struct srp_target_port *target = cm_id->context;
1150 struct ib_qp_attr *qp_attr = NULL;
1151 int attr_mask = 0;
1152 int comp = 0;
1153 int opcode = 0;
1154
1155 switch (event->event) {
1156 case IB_CM_REQ_ERROR:
1157 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1158 comp = 1;
1159 target->status = -ECONNRESET;
1160 break;
1161
1162 case IB_CM_REP_RECEIVED:
1163 comp = 1;
1164 opcode = *(u8 *) event->private_data;
1165
1166 if (opcode == SRP_LOGIN_RSP) {
1167 struct srp_login_rsp *rsp = event->private_data;
1168
1169 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1170 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1171
1172 target->scsi_host->can_queue = min(target->req_lim,
1173 target->scsi_host->can_queue);
1174 } else {
1175 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1176 target->status = -ECONNRESET;
1177 break;
1178 }
1179
1180 target->status = srp_alloc_iu_bufs(target);
1181 if (target->status)
1182 break;
1183
1184 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1185 if (!qp_attr) {
1186 target->status = -ENOMEM;
1187 break;
1188 }
1189
1190 qp_attr->qp_state = IB_QPS_RTR;
1191 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1192 if (target->status)
1193 break;
1194
1195 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1196 if (target->status)
1197 break;
1198
1199 target->status = srp_post_recv(target);
1200 if (target->status)
1201 break;
1202
1203 qp_attr->qp_state = IB_QPS_RTS;
1204 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1205 if (target->status)
1206 break;
1207
1208 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1209 if (target->status)
1210 break;
1211
1212 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1213 if (target->status)
1214 break;
1215
1216 break;
1217
1218 case IB_CM_REJ_RECEIVED:
1219 printk(KERN_DEBUG PFX "REJ received\n");
1220 comp = 1;
1221
1222 srp_cm_rej_handler(cm_id, event, target);
1223 break;
1224
1225 case IB_CM_DREQ_RECEIVED:
1226 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1227 if (ib_send_cm_drep(cm_id, NULL, 0))
1228 printk(KERN_ERR PFX "Sending CM DREP failed\n");
1229 break;
1230
1231 case IB_CM_TIMEWAIT_EXIT:
1232 printk(KERN_ERR PFX "connection closed\n");
1233
1234 comp = 1;
1235 target->status = 0;
1236 break;
1237
1238 case IB_CM_MRA_RECEIVED:
1239 case IB_CM_DREQ_ERROR:
1240 case IB_CM_DREP_RECEIVED:
1241 break;
1242
1243 default:
1244 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1245 break;
1246 }
1247
1248 if (comp)
1249 complete(&target->done);
1250
1251 kfree(qp_attr);
1252
1253 return 0;
1254 }
1255
1256 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1257 struct srp_request *req, u8 func)
1258 {
1259 struct srp_iu *iu;
1260 struct srp_tsk_mgmt *tsk_mgmt;
1261
1262 spin_lock_irq(target->scsi_host->host_lock);
1263
1264 if (target->state == SRP_TARGET_DEAD ||
1265 target->state == SRP_TARGET_REMOVED) {
1266 req->scmnd->result = DID_BAD_TARGET << 16;
1267 goto out;
1268 }
1269
1270 init_completion(&req->done);
1271
1272 iu = __srp_get_tx_iu(target);
1273 if (!iu)
1274 goto out;
1275
1276 tsk_mgmt = iu->buf;
1277 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1278
1279 tsk_mgmt->opcode = SRP_TSK_MGMT;
1280 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1281 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1282 tsk_mgmt->tsk_mgmt_func = func;
1283 tsk_mgmt->task_tag = req->index;
1284
1285 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1286 goto out;
1287
1288 req->tsk_mgmt = iu;
1289
1290 spin_unlock_irq(target->scsi_host->host_lock);
1291
1292 if (!wait_for_completion_timeout(&req->done,
1293 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1294 return -1;
1295
1296 return 0;
1297
1298 out:
1299 spin_unlock_irq(target->scsi_host->host_lock);
1300 return -1;
1301 }
1302
1303 static int srp_find_req(struct srp_target_port *target,
1304 struct scsi_cmnd *scmnd,
1305 struct srp_request **req)
1306 {
1307 if (scmnd->host_scribble == (void *) -1L)
1308 return -1;
1309
1310 *req = &target->req_ring[(long) scmnd->host_scribble];
1311
1312 return 0;
1313 }
1314
1315 static int srp_abort(struct scsi_cmnd *scmnd)
1316 {
1317 struct srp_target_port *target = host_to_target(scmnd->device->host);
1318 struct srp_request *req;
1319 int ret = SUCCESS;
1320
1321 printk(KERN_ERR "SRP abort called\n");
1322
1323 if (srp_find_req(target, scmnd, &req))
1324 return FAILED;
1325 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1326 return FAILED;
1327
1328 spin_lock_irq(target->scsi_host->host_lock);
1329
1330 if (req->cmd_done) {
1331 srp_remove_req(target, req);
1332 scmnd->scsi_done(scmnd);
1333 } else if (!req->tsk_status) {
1334 srp_remove_req(target, req);
1335 scmnd->result = DID_ABORT << 16;
1336 } else
1337 ret = FAILED;
1338
1339 spin_unlock_irq(target->scsi_host->host_lock);
1340
1341 return ret;
1342 }
1343
1344 static int srp_reset_device(struct scsi_cmnd *scmnd)
1345 {
1346 struct srp_target_port *target = host_to_target(scmnd->device->host);
1347 struct srp_request *req, *tmp;
1348
1349 printk(KERN_ERR "SRP reset_device called\n");
1350
1351 if (srp_find_req(target, scmnd, &req))
1352 return FAILED;
1353 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1354 return FAILED;
1355 if (req->tsk_status)
1356 return FAILED;
1357
1358 spin_lock_irq(target->scsi_host->host_lock);
1359
1360 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1361 if (req->scmnd->device == scmnd->device)
1362 srp_reset_req(target, req);
1363
1364 spin_unlock_irq(target->scsi_host->host_lock);
1365
1366 return SUCCESS;
1367 }
1368
1369 static int srp_reset_host(struct scsi_cmnd *scmnd)
1370 {
1371 struct srp_target_port *target = host_to_target(scmnd->device->host);
1372 int ret = FAILED;
1373
1374 printk(KERN_ERR PFX "SRP reset_host called\n");
1375
1376 if (!srp_reconnect_target(target))
1377 ret = SUCCESS;
1378
1379 return ret;
1380 }
1381
1382 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1383 {
1384 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1385
1386 if (target->state == SRP_TARGET_DEAD ||
1387 target->state == SRP_TARGET_REMOVED)
1388 return -ENODEV;
1389
1390 return sprintf(buf, "0x%016llx\n",
1391 (unsigned long long) be64_to_cpu(target->id_ext));
1392 }
1393
1394 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1395 {
1396 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1397
1398 if (target->state == SRP_TARGET_DEAD ||
1399 target->state == SRP_TARGET_REMOVED)
1400 return -ENODEV;
1401
1402 return sprintf(buf, "0x%016llx\n",
1403 (unsigned long long) be64_to_cpu(target->ioc_guid));
1404 }
1405
1406 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1407 {
1408 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1409
1410 if (target->state == SRP_TARGET_DEAD ||
1411 target->state == SRP_TARGET_REMOVED)
1412 return -ENODEV;
1413
1414 return sprintf(buf, "0x%016llx\n",
1415 (unsigned long long) be64_to_cpu(target->service_id));
1416 }
1417
1418 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1419 {
1420 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1421
1422 if (target->state == SRP_TARGET_DEAD ||
1423 target->state == SRP_TARGET_REMOVED)
1424 return -ENODEV;
1425
1426 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1427 }
1428
1429 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1430 {
1431 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1432
1433 if (target->state == SRP_TARGET_DEAD ||
1434 target->state == SRP_TARGET_REMOVED)
1435 return -ENODEV;
1436
1437 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1438 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1439 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1440 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1441 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1442 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1443 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1444 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1445 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1446 }
1447
1448 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1449 {
1450 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1451
1452 if (target->state == SRP_TARGET_DEAD ||
1453 target->state == SRP_TARGET_REMOVED)
1454 return -ENODEV;
1455
1456 return sprintf(buf, "%d\n", target->zero_req_lim);
1457 }
1458
1459 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1460 {
1461 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1462
1463 return sprintf(buf, "%d\n", target->srp_host->port);
1464 }
1465
1466 static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1467 {
1468 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1469
1470 return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1471 }
1472
1473 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1474 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1475 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1476 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1477 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1478 static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1479 static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1480 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1481
1482 static struct class_device_attribute *srp_host_attrs[] = {
1483 &class_device_attr_id_ext,
1484 &class_device_attr_ioc_guid,
1485 &class_device_attr_service_id,
1486 &class_device_attr_pkey,
1487 &class_device_attr_dgid,
1488 &class_device_attr_zero_req_lim,
1489 &class_device_attr_local_ib_port,
1490 &class_device_attr_local_ib_device,
1491 NULL
1492 };
1493
1494 static struct scsi_host_template srp_template = {
1495 .module = THIS_MODULE,
1496 .name = DRV_NAME,
1497 .info = srp_target_info,
1498 .queuecommand = srp_queuecommand,
1499 .eh_abort_handler = srp_abort,
1500 .eh_device_reset_handler = srp_reset_device,
1501 .eh_host_reset_handler = srp_reset_host,
1502 .can_queue = SRP_SQ_SIZE,
1503 .this_id = -1,
1504 .cmd_per_lun = SRP_SQ_SIZE,
1505 .use_clustering = ENABLE_CLUSTERING,
1506 .shost_attrs = srp_host_attrs
1507 };
1508
1509 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1510 {
1511 sprintf(target->target_name, "SRP.T10:%016llX",
1512 (unsigned long long) be64_to_cpu(target->id_ext));
1513
1514 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1515 return -ENODEV;
1516
1517 spin_lock(&host->target_lock);
1518 list_add_tail(&target->list, &host->target_list);
1519 spin_unlock(&host->target_lock);
1520
1521 target->state = SRP_TARGET_LIVE;
1522
1523 scsi_scan_target(&target->scsi_host->shost_gendev,
1524 0, target->scsi_id, SCAN_WILD_CARD, 0);
1525
1526 return 0;
1527 }
1528
1529 static void srp_release_class_dev(struct class_device *class_dev)
1530 {
1531 struct srp_host *host =
1532 container_of(class_dev, struct srp_host, class_dev);
1533
1534 complete(&host->released);
1535 }
1536
1537 static struct class srp_class = {
1538 .name = "infiniband_srp",
1539 .release = srp_release_class_dev
1540 };
1541
1542 /*
1543 * Target ports are added by writing
1544 *
1545 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1546 * pkey=<P_Key>,service_id=<service ID>
1547 *
1548 * to the add_target sysfs attribute.
1549 */
1550 enum {
1551 SRP_OPT_ERR = 0,
1552 SRP_OPT_ID_EXT = 1 << 0,
1553 SRP_OPT_IOC_GUID = 1 << 1,
1554 SRP_OPT_DGID = 1 << 2,
1555 SRP_OPT_PKEY = 1 << 3,
1556 SRP_OPT_SERVICE_ID = 1 << 4,
1557 SRP_OPT_MAX_SECT = 1 << 5,
1558 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1559 SRP_OPT_IO_CLASS = 1 << 7,
1560 SRP_OPT_INITIATOR_EXT = 1 << 8,
1561 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1562 SRP_OPT_IOC_GUID |
1563 SRP_OPT_DGID |
1564 SRP_OPT_PKEY |
1565 SRP_OPT_SERVICE_ID),
1566 };
1567
1568 static match_table_t srp_opt_tokens = {
1569 { SRP_OPT_ID_EXT, "id_ext=%s" },
1570 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1571 { SRP_OPT_DGID, "dgid=%s" },
1572 { SRP_OPT_PKEY, "pkey=%x" },
1573 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1574 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1575 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1576 { SRP_OPT_IO_CLASS, "io_class=%x" },
1577 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1578 { SRP_OPT_ERR, NULL }
1579 };
1580
1581 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1582 {
1583 char *options, *sep_opt;
1584 char *p;
1585 char dgid[3];
1586 substring_t args[MAX_OPT_ARGS];
1587 int opt_mask = 0;
1588 int token;
1589 int ret = -EINVAL;
1590 int i;
1591
1592 options = kstrdup(buf, GFP_KERNEL);
1593 if (!options)
1594 return -ENOMEM;
1595
1596 sep_opt = options;
1597 while ((p = strsep(&sep_opt, ",")) != NULL) {
1598 if (!*p)
1599 continue;
1600
1601 token = match_token(p, srp_opt_tokens, args);
1602 opt_mask |= token;
1603
1604 switch (token) {
1605 case SRP_OPT_ID_EXT:
1606 p = match_strdup(args);
1607 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1608 kfree(p);
1609 break;
1610
1611 case SRP_OPT_IOC_GUID:
1612 p = match_strdup(args);
1613 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1614 kfree(p);
1615 break;
1616
1617 case SRP_OPT_DGID:
1618 p = match_strdup(args);
1619 if (strlen(p) != 32) {
1620 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1621 kfree(p);
1622 goto out;
1623 }
1624
1625 for (i = 0; i < 16; ++i) {
1626 strlcpy(dgid, p + i * 2, 3);
1627 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1628 }
1629 kfree(p);
1630 break;
1631
1632 case SRP_OPT_PKEY:
1633 if (match_hex(args, &token)) {
1634 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1635 goto out;
1636 }
1637 target->path.pkey = cpu_to_be16(token);
1638 break;
1639
1640 case SRP_OPT_SERVICE_ID:
1641 p = match_strdup(args);
1642 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1643 kfree(p);
1644 break;
1645
1646 case SRP_OPT_MAX_SECT:
1647 if (match_int(args, &token)) {
1648 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1649 goto out;
1650 }
1651 target->scsi_host->max_sectors = token;
1652 break;
1653
1654 case SRP_OPT_MAX_CMD_PER_LUN:
1655 if (match_int(args, &token)) {
1656 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1657 goto out;
1658 }
1659 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1660 break;
1661
1662 case SRP_OPT_IO_CLASS:
1663 if (match_hex(args, &token)) {
1664 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1665 goto out;
1666 }
1667 if (token != SRP_REV10_IB_IO_CLASS &&
1668 token != SRP_REV16A_IB_IO_CLASS) {
1669 printk(KERN_WARNING PFX "unknown IO class parameter value"
1670 " %x specified (use %x or %x).\n",
1671 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1672 goto out;
1673 }
1674 target->io_class = token;
1675 break;
1676
1677 case SRP_OPT_INITIATOR_EXT:
1678 p = match_strdup(args);
1679 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1680 kfree(p);
1681 break;
1682
1683 default:
1684 printk(KERN_WARNING PFX "unknown parameter or missing value "
1685 "'%s' in target creation request\n", p);
1686 goto out;
1687 }
1688 }
1689
1690 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1691 ret = 0;
1692 else
1693 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1694 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1695 !(srp_opt_tokens[i].token & opt_mask))
1696 printk(KERN_WARNING PFX "target creation request is "
1697 "missing parameter '%s'\n",
1698 srp_opt_tokens[i].pattern);
1699
1700 out:
1701 kfree(options);
1702 return ret;
1703 }
1704
1705 static ssize_t srp_create_target(struct class_device *class_dev,
1706 const char *buf, size_t count)
1707 {
1708 struct srp_host *host =
1709 container_of(class_dev, struct srp_host, class_dev);
1710 struct Scsi_Host *target_host;
1711 struct srp_target_port *target;
1712 int ret;
1713 int i;
1714
1715 target_host = scsi_host_alloc(&srp_template,
1716 sizeof (struct srp_target_port));
1717 if (!target_host)
1718 return -ENOMEM;
1719
1720 target_host->max_lun = SRP_MAX_LUN;
1721
1722 target = host_to_target(target_host);
1723
1724 target->io_class = SRP_REV16A_IB_IO_CLASS;
1725 target->scsi_host = target_host;
1726 target->srp_host = host;
1727
1728 INIT_LIST_HEAD(&target->free_reqs);
1729 INIT_LIST_HEAD(&target->req_queue);
1730 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1731 target->req_ring[i].index = i;
1732 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1733 }
1734
1735 ret = srp_parse_options(buf, target);
1736 if (ret)
1737 goto err;
1738
1739 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1740
1741 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1742 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1743 (unsigned long long) be64_to_cpu(target->id_ext),
1744 (unsigned long long) be64_to_cpu(target->ioc_guid),
1745 be16_to_cpu(target->path.pkey),
1746 (unsigned long long) be64_to_cpu(target->service_id),
1747 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1748 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1749 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1750 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1751 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1752 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1753 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1754 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1755
1756 ret = srp_create_target_ib(target);
1757 if (ret)
1758 goto err;
1759
1760 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1761 if (IS_ERR(target->cm_id)) {
1762 ret = PTR_ERR(target->cm_id);
1763 goto err_free;
1764 }
1765
1766 ret = srp_connect_target(target);
1767 if (ret) {
1768 printk(KERN_ERR PFX "Connection failed\n");
1769 goto err_cm_id;
1770 }
1771
1772 ret = srp_add_target(host, target);
1773 if (ret)
1774 goto err_disconnect;
1775
1776 return count;
1777
1778 err_disconnect:
1779 srp_disconnect_target(target);
1780
1781 err_cm_id:
1782 ib_destroy_cm_id(target->cm_id);
1783
1784 err_free:
1785 srp_free_target_ib(target);
1786
1787 err:
1788 scsi_host_put(target_host);
1789
1790 return ret;
1791 }
1792
1793 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1794
1795 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1796 {
1797 struct srp_host *host =
1798 container_of(class_dev, struct srp_host, class_dev);
1799
1800 return sprintf(buf, "%s\n", host->dev->dev->name);
1801 }
1802
1803 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1804
1805 static ssize_t show_port(struct class_device *class_dev, char *buf)
1806 {
1807 struct srp_host *host =
1808 container_of(class_dev, struct srp_host, class_dev);
1809
1810 return sprintf(buf, "%d\n", host->port);
1811 }
1812
1813 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1814
1815 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1816 {
1817 struct srp_host *host;
1818
1819 host = kzalloc(sizeof *host, GFP_KERNEL);
1820 if (!host)
1821 return NULL;
1822
1823 INIT_LIST_HEAD(&host->target_list);
1824 spin_lock_init(&host->target_lock);
1825 init_completion(&host->released);
1826 host->dev = device;
1827 host->port = port;
1828
1829 host->class_dev.class = &srp_class;
1830 host->class_dev.dev = device->dev->dma_device;
1831 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1832 device->dev->name, port);
1833
1834 if (class_device_register(&host->class_dev))
1835 goto free_host;
1836 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1837 goto err_class;
1838 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1839 goto err_class;
1840 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1841 goto err_class;
1842
1843 return host;
1844
1845 err_class:
1846 class_device_unregister(&host->class_dev);
1847
1848 free_host:
1849 kfree(host);
1850
1851 return NULL;
1852 }
1853
1854 static void srp_add_one(struct ib_device *device)
1855 {
1856 struct srp_device *srp_dev;
1857 struct ib_device_attr *dev_attr;
1858 struct ib_fmr_pool_param fmr_param;
1859 struct srp_host *host;
1860 int s, e, p;
1861
1862 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1863 if (!dev_attr)
1864 return;
1865
1866 if (ib_query_device(device, dev_attr)) {
1867 printk(KERN_WARNING PFX "Query device failed for %s\n",
1868 device->name);
1869 goto free_attr;
1870 }
1871
1872 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1873 if (!srp_dev)
1874 goto free_attr;
1875
1876 /*
1877 * Use the smallest page size supported by the HCA, down to a
1878 * minimum of 512 bytes (which is the smallest sector that a
1879 * SCSI command will ever carry).
1880 */
1881 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1882 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
1883 srp_dev->fmr_page_mask = ~((unsigned long) srp_dev->fmr_page_size - 1);
1884
1885 INIT_LIST_HEAD(&srp_dev->dev_list);
1886
1887 srp_dev->dev = device;
1888 srp_dev->pd = ib_alloc_pd(device);
1889 if (IS_ERR(srp_dev->pd))
1890 goto free_dev;
1891
1892 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1893 IB_ACCESS_LOCAL_WRITE |
1894 IB_ACCESS_REMOTE_READ |
1895 IB_ACCESS_REMOTE_WRITE);
1896 if (IS_ERR(srp_dev->mr))
1897 goto err_pd;
1898
1899 memset(&fmr_param, 0, sizeof fmr_param);
1900 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
1901 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
1902 fmr_param.cache = 1;
1903 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1904 fmr_param.page_shift = srp_dev->fmr_page_shift;
1905 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
1906 IB_ACCESS_REMOTE_WRITE |
1907 IB_ACCESS_REMOTE_READ);
1908
1909 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1910 if (IS_ERR(srp_dev->fmr_pool))
1911 srp_dev->fmr_pool = NULL;
1912
1913 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1914 s = 0;
1915 e = 0;
1916 } else {
1917 s = 1;
1918 e = device->phys_port_cnt;
1919 }
1920
1921 for (p = s; p <= e; ++p) {
1922 host = srp_add_port(srp_dev, p);
1923 if (host)
1924 list_add_tail(&host->list, &srp_dev->dev_list);
1925 }
1926
1927 ib_set_client_data(device, &srp_client, srp_dev);
1928
1929 goto free_attr;
1930
1931 err_pd:
1932 ib_dealloc_pd(srp_dev->pd);
1933
1934 free_dev:
1935 kfree(srp_dev);
1936
1937 free_attr:
1938 kfree(dev_attr);
1939 }
1940
1941 static void srp_remove_one(struct ib_device *device)
1942 {
1943 struct srp_device *srp_dev;
1944 struct srp_host *host, *tmp_host;
1945 LIST_HEAD(target_list);
1946 struct srp_target_port *target, *tmp_target;
1947
1948 srp_dev = ib_get_client_data(device, &srp_client);
1949
1950 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1951 class_device_unregister(&host->class_dev);
1952 /*
1953 * Wait for the sysfs entry to go away, so that no new
1954 * target ports can be created.
1955 */
1956 wait_for_completion(&host->released);
1957
1958 /*
1959 * Mark all target ports as removed, so we stop queueing
1960 * commands and don't try to reconnect.
1961 */
1962 spin_lock(&host->target_lock);
1963 list_for_each_entry(target, &host->target_list, list) {
1964 spin_lock_irq(target->scsi_host->host_lock);
1965 target->state = SRP_TARGET_REMOVED;
1966 spin_unlock_irq(target->scsi_host->host_lock);
1967 }
1968 spin_unlock(&host->target_lock);
1969
1970 /*
1971 * Wait for any reconnection tasks that may have
1972 * started before we marked our target ports as
1973 * removed, and any target port removal tasks.
1974 */
1975 flush_scheduled_work();
1976
1977 list_for_each_entry_safe(target, tmp_target,
1978 &host->target_list, list) {
1979 scsi_remove_host(target->scsi_host);
1980 srp_disconnect_target(target);
1981 ib_destroy_cm_id(target->cm_id);
1982 srp_free_target_ib(target);
1983 scsi_host_put(target->scsi_host);
1984 }
1985
1986 kfree(host);
1987 }
1988
1989 if (srp_dev->fmr_pool)
1990 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1991 ib_dereg_mr(srp_dev->mr);
1992 ib_dealloc_pd(srp_dev->pd);
1993
1994 kfree(srp_dev);
1995 }
1996
1997 static int __init srp_init_module(void)
1998 {
1999 int ret;
2000
2001 srp_template.sg_tablesize = srp_sg_tablesize;
2002 srp_max_iu_len = (sizeof (struct srp_cmd) +
2003 sizeof (struct srp_indirect_buf) +
2004 srp_sg_tablesize * 16);
2005
2006 ret = class_register(&srp_class);
2007 if (ret) {
2008 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2009 return ret;
2010 }
2011
2012 ib_sa_register_client(&srp_sa_client);
2013
2014 ret = ib_register_client(&srp_client);
2015 if (ret) {
2016 printk(KERN_ERR PFX "couldn't register IB client\n");
2017 ib_sa_unregister_client(&srp_sa_client);
2018 class_unregister(&srp_class);
2019 return ret;
2020 }
2021
2022 return 0;
2023 }
2024
2025 static void __exit srp_cleanup_module(void)
2026 {
2027 ib_unregister_client(&srp_client);
2028 ib_sa_unregister_client(&srp_sa_client);
2029 class_unregister(&srp_class);
2030 }
2031
2032 module_init(srp_init_module);
2033 module_exit(srp_cleanup_module);
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