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Linux 3.12.70
[linux/fpc-iii.git] / drivers / infiniband / ulp / srp / ib_srp.c
blob15984e1c0b613a47caab475df67e770edba06824
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
33 #define pr_fmt(fmt) PFX fmt
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 <linux/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 #include <scsi/scsi_transport_srp.h>
51
52 #include "ib_srp.h"
53
54 #define DRV_NAME "ib_srp"
55 #define PFX DRV_NAME ": "
56 #define DRV_VERSION "1.0"
57 #define DRV_RELDATE "July 1, 2013"
58
59 MODULE_AUTHOR("Roland Dreier");
60 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
61 "v" DRV_VERSION " (" DRV_RELDATE ")");
62 MODULE_LICENSE("Dual BSD/GPL");
63
64 static unsigned int srp_sg_tablesize;
65 static unsigned int cmd_sg_entries;
66 static unsigned int indirect_sg_entries;
67 static bool allow_ext_sg;
68 static int topspin_workarounds = 1;
69
70 module_param(srp_sg_tablesize, uint, 0444);
71 MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
72
73 module_param(cmd_sg_entries, uint, 0444);
74 MODULE_PARM_DESC(cmd_sg_entries,
75 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
76
77 module_param(indirect_sg_entries, uint, 0444);
78 MODULE_PARM_DESC(indirect_sg_entries,
79 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
80
81 module_param(allow_ext_sg, bool, 0444);
82 MODULE_PARM_DESC(allow_ext_sg,
83 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
84
85 module_param(topspin_workarounds, int, 0444);
86 MODULE_PARM_DESC(topspin_workarounds,
87 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
88
89 static void srp_add_one(struct ib_device *device);
90 static void srp_remove_one(struct ib_device *device);
91 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
92 static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
93 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
94
95 static struct scsi_transport_template *ib_srp_transport_template;
96 static struct workqueue_struct *srp_remove_wq;
97
98 static struct ib_client srp_client = {
99 .name = "srp",
100 .add = srp_add_one,
101 .remove = srp_remove_one
102 };
103
104 static struct ib_sa_client srp_sa_client;
105
106 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
107 {
108 return (struct srp_target_port *) host->hostdata;
109 }
110
111 static const char *srp_target_info(struct Scsi_Host *host)
112 {
113 return host_to_target(host)->target_name;
114 }
115
116 static int srp_target_is_topspin(struct srp_target_port *target)
117 {
118 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
119 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
120
121 return topspin_workarounds &&
122 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
123 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
124 }
125
126 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
127 gfp_t gfp_mask,
128 enum dma_data_direction direction)
129 {
130 struct srp_iu *iu;
131
132 iu = kmalloc(sizeof *iu, gfp_mask);
133 if (!iu)
134 goto out;
135
136 iu->buf = kzalloc(size, gfp_mask);
137 if (!iu->buf)
138 goto out_free_iu;
139
140 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
141 direction);
142 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
143 goto out_free_buf;
144
145 iu->size = size;
146 iu->direction = direction;
147
148 return iu;
149
150 out_free_buf:
151 kfree(iu->buf);
152 out_free_iu:
153 kfree(iu);
154 out:
155 return NULL;
156 }
157
158 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
159 {
160 if (!iu)
161 return;
162
163 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
164 iu->direction);
165 kfree(iu->buf);
166 kfree(iu);
167 }
168
169 static void srp_qp_event(struct ib_event *event, void *context)
170 {
171 pr_debug("QP event %d\n", event->event);
172 }
173
174 static int srp_init_qp(struct srp_target_port *target,
175 struct ib_qp *qp)
176 {
177 struct ib_qp_attr *attr;
178 int ret;
179
180 attr = kmalloc(sizeof *attr, GFP_KERNEL);
181 if (!attr)
182 return -ENOMEM;
183
184 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
185 target->srp_host->port,
186 be16_to_cpu(target->path.pkey),
187 &attr->pkey_index);
188 if (ret)
189 goto out;
190
191 attr->qp_state = IB_QPS_INIT;
192 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
193 IB_ACCESS_REMOTE_WRITE);
194 attr->port_num = target->srp_host->port;
195
196 ret = ib_modify_qp(qp, attr,
197 IB_QP_STATE |
198 IB_QP_PKEY_INDEX |
199 IB_QP_ACCESS_FLAGS |
200 IB_QP_PORT);
201
202 out:
203 kfree(attr);
204 return ret;
205 }
206
207 static int srp_new_cm_id(struct srp_target_port *target)
208 {
209 struct ib_cm_id *new_cm_id;
210
211 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
212 srp_cm_handler, target);
213 if (IS_ERR(new_cm_id))
214 return PTR_ERR(new_cm_id);
215
216 if (target->cm_id)
217 ib_destroy_cm_id(target->cm_id);
218 target->cm_id = new_cm_id;
219
220 return 0;
221 }
222
223 static int srp_create_target_ib(struct srp_target_port *target)
224 {
225 struct ib_qp_init_attr *init_attr;
226 struct ib_cq *recv_cq, *send_cq;
227 struct ib_qp *qp;
228 int ret;
229
230 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
231 if (!init_attr)
232 return -ENOMEM;
233
234 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
235 srp_recv_completion, NULL, target, SRP_RQ_SIZE,
236 target->comp_vector);
237 if (IS_ERR(recv_cq)) {
238 ret = PTR_ERR(recv_cq);
239 goto err;
240 }
241
242 send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
243 srp_send_completion, NULL, target, SRP_SQ_SIZE,
244 target->comp_vector);
245 if (IS_ERR(send_cq)) {
246 ret = PTR_ERR(send_cq);
247 goto err_recv_cq;
248 }
249
250 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
251
252 init_attr->event_handler = srp_qp_event;
253 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
254 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
255 init_attr->cap.max_recv_sge = 1;
256 init_attr->cap.max_send_sge = 1;
257 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
258 init_attr->qp_type = IB_QPT_RC;
259 init_attr->send_cq = send_cq;
260 init_attr->recv_cq = recv_cq;
261
262 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
263 if (IS_ERR(qp)) {
264 ret = PTR_ERR(qp);
265 goto err_send_cq;
266 }
267
268 ret = srp_init_qp(target, qp);
269 if (ret)
270 goto err_qp;
271
272 if (target->qp)
273 ib_destroy_qp(target->qp);
274 if (target->recv_cq)
275 ib_destroy_cq(target->recv_cq);
276 if (target->send_cq)
277 ib_destroy_cq(target->send_cq);
278
279 target->qp = qp;
280 target->recv_cq = recv_cq;
281 target->send_cq = send_cq;
282
283 kfree(init_attr);
284 return 0;
285
286 err_qp:
287 ib_destroy_qp(qp);
288
289 err_send_cq:
290 ib_destroy_cq(send_cq);
291
292 err_recv_cq:
293 ib_destroy_cq(recv_cq);
294
295 err:
296 kfree(init_attr);
297 return ret;
298 }
299
300 static void srp_free_target_ib(struct srp_target_port *target)
301 {
302 int i;
303
304 ib_destroy_qp(target->qp);
305 ib_destroy_cq(target->send_cq);
306 ib_destroy_cq(target->recv_cq);
307
308 target->qp = NULL;
309 target->send_cq = target->recv_cq = NULL;
310
311 for (i = 0; i < SRP_RQ_SIZE; ++i)
312 srp_free_iu(target->srp_host, target->rx_ring[i]);
313 for (i = 0; i < SRP_SQ_SIZE; ++i)
314 srp_free_iu(target->srp_host, target->tx_ring[i]);
315 }
316
317 static void srp_path_rec_completion(int status,
318 struct ib_sa_path_rec *pathrec,
319 void *target_ptr)
320 {
321 struct srp_target_port *target = target_ptr;
322
323 target->status = status;
324 if (status)
325 shost_printk(KERN_ERR, target->scsi_host,
326 PFX "Got failed path rec status %d\n", status);
327 else
328 target->path = *pathrec;
329 complete(&target->done);
330 }
331
332 static int srp_lookup_path(struct srp_target_port *target)
333 {
334 target->path.numb_path = 1;
335
336 init_completion(&target->done);
337
338 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
339 target->srp_host->srp_dev->dev,
340 target->srp_host->port,
341 &target->path,
342 IB_SA_PATH_REC_SERVICE_ID |
343 IB_SA_PATH_REC_DGID |
344 IB_SA_PATH_REC_SGID |
345 IB_SA_PATH_REC_NUMB_PATH |
346 IB_SA_PATH_REC_PKEY,
347 SRP_PATH_REC_TIMEOUT_MS,
348 GFP_KERNEL,
349 srp_path_rec_completion,
350 target, &target->path_query);
351 if (target->path_query_id < 0)
352 return target->path_query_id;
353
354 wait_for_completion(&target->done);
355
356 if (target->status < 0)
357 shost_printk(KERN_WARNING, target->scsi_host,
358 PFX "Path record query failed\n");
359
360 return target->status;
361 }
362
363 static int srp_send_req(struct srp_target_port *target)
364 {
365 struct {
366 struct ib_cm_req_param param;
367 struct srp_login_req priv;
368 } *req = NULL;
369 int status;
370
371 req = kzalloc(sizeof *req, GFP_KERNEL);
372 if (!req)
373 return -ENOMEM;
374
375 req->param.primary_path = &target->path;
376 req->param.alternate_path = NULL;
377 req->param.service_id = target->service_id;
378 req->param.qp_num = target->qp->qp_num;
379 req->param.qp_type = target->qp->qp_type;
380 req->param.private_data = &req->priv;
381 req->param.private_data_len = sizeof req->priv;
382 req->param.flow_control = 1;
383
384 get_random_bytes(&req->param.starting_psn, 4);
385 req->param.starting_psn &= 0xffffff;
386
387 /*
388 * Pick some arbitrary defaults here; we could make these
389 * module parameters if anyone cared about setting them.
390 */
391 req->param.responder_resources = 4;
392 req->param.remote_cm_response_timeout = 20;
393 req->param.local_cm_response_timeout = 20;
394 req->param.retry_count = 7;
395 req->param.rnr_retry_count = 7;
396 req->param.max_cm_retries = 15;
397
398 req->priv.opcode = SRP_LOGIN_REQ;
399 req->priv.tag = 0;
400 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
401 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
402 SRP_BUF_FORMAT_INDIRECT);
403 /*
404 * In the published SRP specification (draft rev. 16a), the
405 * port identifier format is 8 bytes of ID extension followed
406 * by 8 bytes of GUID. Older drafts put the two halves in the
407 * opposite order, so that the GUID comes first.
408 *
409 * Targets conforming to these obsolete drafts can be
410 * recognized by the I/O Class they report.
411 */
412 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
413 memcpy(req->priv.initiator_port_id,
414 &target->path.sgid.global.interface_id, 8);
415 memcpy(req->priv.initiator_port_id + 8,
416 &target->initiator_ext, 8);
417 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
418 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
419 } else {
420 memcpy(req->priv.initiator_port_id,
421 &target->initiator_ext, 8);
422 memcpy(req->priv.initiator_port_id + 8,
423 &target->path.sgid.global.interface_id, 8);
424 memcpy(req->priv.target_port_id, &target->id_ext, 8);
425 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
426 }
427
428 /*
429 * Topspin/Cisco SRP targets will reject our login unless we
430 * zero out the first 8 bytes of our initiator port ID and set
431 * the second 8 bytes to the local node GUID.
432 */
433 if (srp_target_is_topspin(target)) {
434 shost_printk(KERN_DEBUG, target->scsi_host,
435 PFX "Topspin/Cisco initiator port ID workaround "
436 "activated for target GUID %016llx\n",
437 (unsigned long long) be64_to_cpu(target->ioc_guid));
438 memset(req->priv.initiator_port_id, 0, 8);
439 memcpy(req->priv.initiator_port_id + 8,
440 &target->srp_host->srp_dev->dev->node_guid, 8);
441 }
442
443 status = ib_send_cm_req(target->cm_id, &req->param);
444
445 kfree(req);
446
447 return status;
448 }
449
450 static bool srp_queue_remove_work(struct srp_target_port *target)
451 {
452 bool changed = false;
453
454 spin_lock_irq(&target->lock);
455 if (target->state != SRP_TARGET_REMOVED) {
456 target->state = SRP_TARGET_REMOVED;
457 changed = true;
458 }
459 spin_unlock_irq(&target->lock);
460
461 if (changed)
462 queue_work(srp_remove_wq, &target->remove_work);
463
464 return changed;
465 }
466
467 static bool srp_change_conn_state(struct srp_target_port *target,
468 bool connected)
469 {
470 bool changed = false;
471
472 spin_lock_irq(&target->lock);
473 if (target->connected != connected) {
474 target->connected = connected;
475 changed = true;
476 }
477 spin_unlock_irq(&target->lock);
478
479 return changed;
480 }
481
482 static void srp_disconnect_target(struct srp_target_port *target)
483 {
484 if (srp_change_conn_state(target, false)) {
485 /* XXX should send SRP_I_LOGOUT request */
486
487 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
488 shost_printk(KERN_DEBUG, target->scsi_host,
489 PFX "Sending CM DREQ failed\n");
490 }
491 }
492 }
493
494 static void srp_free_req_data(struct srp_target_port *target)
495 {
496 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
497 struct srp_request *req;
498 int i;
499
500 for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
501 kfree(req->fmr_list);
502 kfree(req->map_page);
503 if (req->indirect_dma_addr) {
504 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
505 target->indirect_size,
506 DMA_TO_DEVICE);
507 }
508 kfree(req->indirect_desc);
509 }
510 }
511
512 /**
513 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
514 * @shost: SCSI host whose attributes to remove from sysfs.
515 *
516 * Note: Any attributes defined in the host template and that did not exist
517 * before invocation of this function will be ignored.
518 */
519 static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
520 {
521 struct device_attribute **attr;
522
523 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
524 device_remove_file(&shost->shost_dev, *attr);
525 }
526
527 static void srp_remove_target(struct srp_target_port *target)
528 {
529 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
530
531 srp_del_scsi_host_attr(target->scsi_host);
532 srp_remove_host(target->scsi_host);
533 scsi_remove_host(target->scsi_host);
534 srp_disconnect_target(target);
535 ib_destroy_cm_id(target->cm_id);
536 srp_free_target_ib(target);
537 srp_free_req_data(target);
538
539 spin_lock(&target->srp_host->target_lock);
540 list_del(&target->list);
541 spin_unlock(&target->srp_host->target_lock);
542
543 scsi_host_put(target->scsi_host);
544 }
545
546 static void srp_remove_work(struct work_struct *work)
547 {
548 struct srp_target_port *target =
549 container_of(work, struct srp_target_port, remove_work);
550
551 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
552
553 srp_remove_target(target);
554 }
555
556 static void srp_rport_delete(struct srp_rport *rport)
557 {
558 struct srp_target_port *target = rport->lld_data;
559
560 srp_queue_remove_work(target);
561 }
562
563 static int srp_connect_target(struct srp_target_port *target)
564 {
565 int retries = 3;
566 int ret;
567
568 WARN_ON_ONCE(target->connected);
569
570 target->qp_in_error = false;
571
572 ret = srp_lookup_path(target);
573 if (ret)
574 return ret;
575
576 while (1) {
577 init_completion(&target->done);
578 ret = srp_send_req(target);
579 if (ret)
580 return ret;
581 wait_for_completion(&target->done);
582
583 /*
584 * The CM event handling code will set status to
585 * SRP_PORT_REDIRECT if we get a port redirect REJ
586 * back, or SRP_DLID_REDIRECT if we get a lid/qp
587 * redirect REJ back.
588 */
589 switch (target->status) {
590 case 0:
591 srp_change_conn_state(target, true);
592 return 0;
593
594 case SRP_PORT_REDIRECT:
595 ret = srp_lookup_path(target);
596 if (ret)
597 return ret;
598 break;
599
600 case SRP_DLID_REDIRECT:
601 break;
602
603 case SRP_STALE_CONN:
604 /* Our current CM id was stale, and is now in timewait.
605 * Try to reconnect with a new one.
606 */
607 if (!retries-- || srp_new_cm_id(target)) {
608 shost_printk(KERN_ERR, target->scsi_host, PFX
609 "giving up on stale connection\n");
610 target->status = -ECONNRESET;
611 return target->status;
612 }
613
614 shost_printk(KERN_ERR, target->scsi_host, PFX
615 "retrying stale connection\n");
616 break;
617
618 default:
619 return target->status;
620 }
621 }
622 }
623
624 static void srp_unmap_data(struct scsi_cmnd *scmnd,
625 struct srp_target_port *target,
626 struct srp_request *req)
627 {
628 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
629 struct ib_pool_fmr **pfmr;
630
631 if (!scsi_sglist(scmnd) ||
632 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
633 scmnd->sc_data_direction != DMA_FROM_DEVICE))
634 return;
635
636 pfmr = req->fmr_list;
637 while (req->nfmr--)
638 ib_fmr_pool_unmap(*pfmr++);
639
640 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
641 scmnd->sc_data_direction);
642 }
643
644 /**
645 * srp_claim_req - Take ownership of the scmnd associated with a request.
646 * @target: SRP target port.
647 * @req: SRP request.
648 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
649 * ownership of @req->scmnd if it equals @scmnd.
650 *
651 * Return value:
652 * Either NULL or a pointer to the SCSI command the caller became owner of.
653 */
654 static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
655 struct srp_request *req,
656 struct scsi_cmnd *scmnd)
657 {
658 unsigned long flags;
659
660 spin_lock_irqsave(&target->lock, flags);
661 if (!scmnd) {
662 scmnd = req->scmnd;
663 req->scmnd = NULL;
664 } else if (req->scmnd == scmnd) {
665 req->scmnd = NULL;
666 } else {
667 scmnd = NULL;
668 }
669 spin_unlock_irqrestore(&target->lock, flags);
670
671 return scmnd;
672 }
673
674 /**
675 * srp_free_req() - Unmap data and add request to the free request list.
676 */
677 static void srp_free_req(struct srp_target_port *target,
678 struct srp_request *req, struct scsi_cmnd *scmnd,
679 s32 req_lim_delta)
680 {
681 unsigned long flags;
682
683 srp_unmap_data(scmnd, target, req);
684
685 spin_lock_irqsave(&target->lock, flags);
686 target->req_lim += req_lim_delta;
687 list_add_tail(&req->list, &target->free_reqs);
688 spin_unlock_irqrestore(&target->lock, flags);
689 }
690
691 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
692 {
693 struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
694
695 if (scmnd) {
696 srp_free_req(target, req, scmnd, 0);
697 scmnd->result = DID_RESET << 16;
698 scmnd->scsi_done(scmnd);
699 }
700 }
701
702 static int srp_reconnect_target(struct srp_target_port *target)
703 {
704 struct Scsi_Host *shost = target->scsi_host;
705 int i, ret;
706
707 scsi_target_block(&shost->shost_gendev);
708
709 srp_disconnect_target(target);
710 /*
711 * Now get a new local CM ID so that we avoid confusing the target in
712 * case things are really fouled up. Doing so also ensures that all CM
713 * callbacks will have finished before a new QP is allocated.
714 */
715 ret = srp_new_cm_id(target);
716 /*
717 * Whether or not creating a new CM ID succeeded, create a new
718 * QP. This guarantees that all completion callback function
719 * invocations have finished before request resetting starts.
720 */
721 if (ret == 0)
722 ret = srp_create_target_ib(target);
723 else
724 srp_create_target_ib(target);
725
726 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
727 struct srp_request *req = &target->req_ring[i];
728 if (req->scmnd)
729 srp_reset_req(target, req);
730 }
731
732 INIT_LIST_HEAD(&target->free_tx);
733 for (i = 0; i < SRP_SQ_SIZE; ++i)
734 list_add(&target->tx_ring[i]->list, &target->free_tx);
735
736 if (ret == 0)
737 ret = srp_connect_target(target);
738
739 scsi_target_unblock(&shost->shost_gendev, ret == 0 ? SDEV_RUNNING :
740 SDEV_TRANSPORT_OFFLINE);
741 target->transport_offline = !!ret;
742
743 if (ret)
744 goto err;
745
746 shost_printk(KERN_INFO, target->scsi_host, PFX "reconnect succeeded\n");
747
748 return ret;
749
750 err:
751 shost_printk(KERN_ERR, target->scsi_host,
752 PFX "reconnect failed (%d), removing target port.\n", ret);
753
754 /*
755 * We couldn't reconnect, so kill our target port off.
756 * However, we have to defer the real removal because we
757 * are in the context of the SCSI error handler now, which
758 * will deadlock if we call scsi_remove_host().
759 */
760 srp_queue_remove_work(target);
761
762 return ret;
763 }
764
765 static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
766 unsigned int dma_len, u32 rkey)
767 {
768 struct srp_direct_buf *desc = state->desc;
769
770 desc->va = cpu_to_be64(dma_addr);
771 desc->key = cpu_to_be32(rkey);
772 desc->len = cpu_to_be32(dma_len);
773
774 state->total_len += dma_len;
775 state->desc++;
776 state->ndesc++;
777 }
778
779 static int srp_map_finish_fmr(struct srp_map_state *state,
780 struct srp_target_port *target)
781 {
782 struct srp_device *dev = target->srp_host->srp_dev;
783 struct ib_pool_fmr *fmr;
784 u64 io_addr = 0;
785
786 if (!state->npages)
787 return 0;
788
789 if (state->npages == 1) {
790 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
791 target->rkey);
792 state->npages = state->fmr_len = 0;
793 return 0;
794 }
795
796 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
797 state->npages, io_addr);
798 if (IS_ERR(fmr))
799 return PTR_ERR(fmr);
800
801 *state->next_fmr++ = fmr;
802 state->nfmr++;
803
804 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
805 state->npages = state->fmr_len = 0;
806 return 0;
807 }
808
809 static void srp_map_update_start(struct srp_map_state *state,
810 struct scatterlist *sg, int sg_index,
811 dma_addr_t dma_addr)
812 {
813 state->unmapped_sg = sg;
814 state->unmapped_index = sg_index;
815 state->unmapped_addr = dma_addr;
816 }
817
818 static int srp_map_sg_entry(struct srp_map_state *state,
819 struct srp_target_port *target,
820 struct scatterlist *sg, int sg_index,
821 int use_fmr)
822 {
823 struct srp_device *dev = target->srp_host->srp_dev;
824 struct ib_device *ibdev = dev->dev;
825 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
826 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
827 unsigned int len;
828 int ret;
829
830 if (!dma_len)
831 return 0;
832
833 if (use_fmr == SRP_MAP_NO_FMR) {
834 /* Once we're in direct map mode for a request, we don't
835 * go back to FMR mode, so no need to update anything
836 * other than the descriptor.
837 */
838 srp_map_desc(state, dma_addr, dma_len, target->rkey);
839 return 0;
840 }
841
842 /* If we start at an offset into the FMR page, don't merge into
843 * the current FMR. Finish it out, and use the kernel's MR for this
844 * sg entry. This is to avoid potential bugs on some SRP targets
845 * that were never quite defined, but went away when the initiator
846 * avoided using FMR on such page fragments.
847 */
848 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
849 ret = srp_map_finish_fmr(state, target);
850 if (ret)
851 return ret;
852
853 srp_map_desc(state, dma_addr, dma_len, target->rkey);
854 srp_map_update_start(state, NULL, 0, 0);
855 return 0;
856 }
857
858 /* If this is the first sg to go into the FMR, save our position.
859 * We need to know the first unmapped entry, its index, and the
860 * first unmapped address within that entry to be able to restart
861 * mapping after an error.
862 */
863 if (!state->unmapped_sg)
864 srp_map_update_start(state, sg, sg_index, dma_addr);
865
866 while (dma_len) {
867 if (state->npages == SRP_FMR_SIZE) {
868 ret = srp_map_finish_fmr(state, target);
869 if (ret)
870 return ret;
871
872 srp_map_update_start(state, sg, sg_index, dma_addr);
873 }
874
875 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
876
877 if (!state->npages)
878 state->base_dma_addr = dma_addr;
879 state->pages[state->npages++] = dma_addr;
880 state->fmr_len += len;
881 dma_addr += len;
882 dma_len -= len;
883 }
884
885 /* If the last entry of the FMR wasn't a full page, then we need to
886 * close it out and start a new one -- we can only merge at page
887 * boundries.
888 */
889 ret = 0;
890 if (len != dev->fmr_page_size) {
891 ret = srp_map_finish_fmr(state, target);
892 if (!ret)
893 srp_map_update_start(state, NULL, 0, 0);
894 }
895 return ret;
896 }
897
898 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
899 struct srp_request *req)
900 {
901 struct scatterlist *scat, *sg;
902 struct srp_cmd *cmd = req->cmd->buf;
903 int i, len, nents, count, use_fmr;
904 struct srp_device *dev;
905 struct ib_device *ibdev;
906 struct srp_map_state state;
907 struct srp_indirect_buf *indirect_hdr;
908 u32 table_len;
909 u8 fmt;
910
911 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
912 return sizeof (struct srp_cmd);
913
914 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
915 scmnd->sc_data_direction != DMA_TO_DEVICE) {
916 shost_printk(KERN_WARNING, target->scsi_host,
917 PFX "Unhandled data direction %d\n",
918 scmnd->sc_data_direction);
919 return -EINVAL;
920 }
921
922 nents = scsi_sg_count(scmnd);
923 scat = scsi_sglist(scmnd);
924
925 dev = target->srp_host->srp_dev;
926 ibdev = dev->dev;
927
928 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
929 if (unlikely(count == 0))
930 return -EIO;
931
932 fmt = SRP_DATA_DESC_DIRECT;
933 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
934
935 if (count == 1) {
936 /*
937 * The midlayer only generated a single gather/scatter
938 * entry, or DMA mapping coalesced everything to a
939 * single entry. So a direct descriptor along with
940 * the DMA MR suffices.
941 */
942 struct srp_direct_buf *buf = (void *) cmd->add_data;
943
944 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
945 buf->key = cpu_to_be32(target->rkey);
946 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
947
948 req->nfmr = 0;
949 goto map_complete;
950 }
951
952 /* We have more than one scatter/gather entry, so build our indirect
953 * descriptor table, trying to merge as many entries with FMR as we
954 * can.
955 */
956 indirect_hdr = (void *) cmd->add_data;
957
958 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
959 target->indirect_size, DMA_TO_DEVICE);
960
961 memset(&state, 0, sizeof(state));
962 state.desc = req->indirect_desc;
963 state.pages = req->map_page;
964 state.next_fmr = req->fmr_list;
965
966 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
967
968 for_each_sg(scat, sg, count, i) {
969 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
970 /* FMR mapping failed, so backtrack to the first
971 * unmapped entry and continue on without using FMR.
972 */
973 dma_addr_t dma_addr;
974 unsigned int dma_len;
975
976 backtrack:
977 sg = state.unmapped_sg;
978 i = state.unmapped_index;
979
980 dma_addr = ib_sg_dma_address(ibdev, sg);
981 dma_len = ib_sg_dma_len(ibdev, sg);
982 dma_len -= (state.unmapped_addr - dma_addr);
983 dma_addr = state.unmapped_addr;
984 use_fmr = SRP_MAP_NO_FMR;
985 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
986 }
987 }
988
989 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
990 goto backtrack;
991
992 /* We've mapped the request, now pull as much of the indirect
993 * descriptor table as we can into the command buffer. If this
994 * target is not using an external indirect table, we are
995 * guaranteed to fit into the command, as the SCSI layer won't
996 * give us more S/G entries than we allow.
997 */
998 req->nfmr = state.nfmr;
999 if (state.ndesc == 1) {
1000 /* FMR mapping was able to collapse this to one entry,
1001 * so use a direct descriptor.
1002 */
1003 struct srp_direct_buf *buf = (void *) cmd->add_data;
1004
1005 *buf = req->indirect_desc[0];
1006 goto map_complete;
1007 }
1008
1009 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1010 !target->allow_ext_sg)) {
1011 shost_printk(KERN_ERR, target->scsi_host,
1012 "Could not fit S/G list into SRP_CMD\n");
1013 return -EIO;
1014 }
1015
1016 count = min(state.ndesc, target->cmd_sg_cnt);
1017 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1018
1019 fmt = SRP_DATA_DESC_INDIRECT;
1020 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
1021 len += count * sizeof (struct srp_direct_buf);
1022
1023 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1024 count * sizeof (struct srp_direct_buf));
1025
1026 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1027 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1028 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1029 indirect_hdr->len = cpu_to_be32(state.total_len);
1030
1031 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1032 cmd->data_out_desc_cnt = count;
1033 else
1034 cmd->data_in_desc_cnt = count;
1035
1036 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1037 DMA_TO_DEVICE);
1038
1039 map_complete:
1040 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1041 cmd->buf_fmt = fmt << 4;
1042 else
1043 cmd->buf_fmt = fmt;
1044
1045 return len;
1046 }
1047
1048 /*
1049 * Return an IU and possible credit to the free pool
1050 */
1051 static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1052 enum srp_iu_type iu_type)
1053 {
1054 unsigned long flags;
1055
1056 spin_lock_irqsave(&target->lock, flags);
1057 list_add(&iu->list, &target->free_tx);
1058 if (iu_type != SRP_IU_RSP)
1059 ++target->req_lim;
1060 spin_unlock_irqrestore(&target->lock, flags);
1061 }
1062
1063 /*
1064 * Must be called with target->lock held to protect req_lim and free_tx.
1065 * If IU is not sent, it must be returned using srp_put_tx_iu().
1066 *
1067 * Note:
1068 * An upper limit for the number of allocated information units for each
1069 * request type is:
1070 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1071 * more than Scsi_Host.can_queue requests.
1072 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1073 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1074 * one unanswered SRP request to an initiator.
1075 */
1076 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1077 enum srp_iu_type iu_type)
1078 {
1079 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1080 struct srp_iu *iu;
1081
1082 srp_send_completion(target->send_cq, target);
1083
1084 if (list_empty(&target->free_tx))
1085 return NULL;
1086
1087 /* Initiator responses to target requests do not consume credits */
1088 if (iu_type != SRP_IU_RSP) {
1089 if (target->req_lim <= rsv) {
1090 ++target->zero_req_lim;
1091 return NULL;
1092 }
1093
1094 --target->req_lim;
1095 }
1096
1097 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
1098 list_del(&iu->list);
1099 return iu;
1100 }
1101
1102 static int srp_post_send(struct srp_target_port *target,
1103 struct srp_iu *iu, int len)
1104 {
1105 struct ib_sge list;
1106 struct ib_send_wr wr, *bad_wr;
1107
1108 list.addr = iu->dma;
1109 list.length = len;
1110 list.lkey = target->lkey;
1111
1112 wr.next = NULL;
1113 wr.wr_id = (uintptr_t) iu;
1114 wr.sg_list = &list;
1115 wr.num_sge = 1;
1116 wr.opcode = IB_WR_SEND;
1117 wr.send_flags = IB_SEND_SIGNALED;
1118
1119 return ib_post_send(target->qp, &wr, &bad_wr);
1120 }
1121
1122 static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
1123 {
1124 struct ib_recv_wr wr, *bad_wr;
1125 struct ib_sge list;
1126
1127 list.addr = iu->dma;
1128 list.length = iu->size;
1129 list.lkey = target->lkey;
1130
1131 wr.next = NULL;
1132 wr.wr_id = (uintptr_t) iu;
1133 wr.sg_list = &list;
1134 wr.num_sge = 1;
1135
1136 return ib_post_recv(target->qp, &wr, &bad_wr);
1137 }
1138
1139 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1140 {
1141 struct srp_request *req;
1142 struct scsi_cmnd *scmnd;
1143 unsigned long flags;
1144
1145 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
1146 spin_lock_irqsave(&target->lock, flags);
1147 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1148 spin_unlock_irqrestore(&target->lock, flags);
1149
1150 target->tsk_mgmt_status = -1;
1151 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1152 target->tsk_mgmt_status = rsp->data[3];
1153 complete(&target->tsk_mgmt_done);
1154 } else {
1155 req = &target->req_ring[rsp->tag];
1156 scmnd = srp_claim_req(target, req, NULL);
1157 if (!scmnd) {
1158 shost_printk(KERN_ERR, target->scsi_host,
1159 "Null scmnd for RSP w/tag %016llx\n",
1160 (unsigned long long) rsp->tag);
1161
1162 spin_lock_irqsave(&target->lock, flags);
1163 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1164 spin_unlock_irqrestore(&target->lock, flags);
1165
1166 return;
1167 }
1168 scmnd->result = rsp->status;
1169
1170 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1171 memcpy(scmnd->sense_buffer, rsp->data +
1172 be32_to_cpu(rsp->resp_data_len),
1173 min_t(int, be32_to_cpu(rsp->sense_data_len),
1174 SCSI_SENSE_BUFFERSIZE));
1175 }
1176
1177 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
1178 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1179 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
1180 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
1181
1182 srp_free_req(target, req, scmnd,
1183 be32_to_cpu(rsp->req_lim_delta));
1184
1185 scmnd->host_scribble = NULL;
1186 scmnd->scsi_done(scmnd);
1187 }
1188 }
1189
1190 static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1191 void *rsp, int len)
1192 {
1193 struct ib_device *dev = target->srp_host->srp_dev->dev;
1194 unsigned long flags;
1195 struct srp_iu *iu;
1196 int err;
1197
1198 spin_lock_irqsave(&target->lock, flags);
1199 target->req_lim += req_delta;
1200 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
1201 spin_unlock_irqrestore(&target->lock, flags);
1202
1203 if (!iu) {
1204 shost_printk(KERN_ERR, target->scsi_host, PFX
1205 "no IU available to send response\n");
1206 return 1;
1207 }
1208
1209 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1210 memcpy(iu->buf, rsp, len);
1211 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1212
1213 err = srp_post_send(target, iu, len);
1214 if (err) {
1215 shost_printk(KERN_ERR, target->scsi_host, PFX
1216 "unable to post response: %d\n", err);
1217 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1218 }
1219
1220 return err;
1221 }
1222
1223 static void srp_process_cred_req(struct srp_target_port *target,
1224 struct srp_cred_req *req)
1225 {
1226 struct srp_cred_rsp rsp = {
1227 .opcode = SRP_CRED_RSP,
1228 .tag = req->tag,
1229 };
1230 s32 delta = be32_to_cpu(req->req_lim_delta);
1231
1232 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1233 shost_printk(KERN_ERR, target->scsi_host, PFX
1234 "problems processing SRP_CRED_REQ\n");
1235 }
1236
1237 static void srp_process_aer_req(struct srp_target_port *target,
1238 struct srp_aer_req *req)
1239 {
1240 struct srp_aer_rsp rsp = {
1241 .opcode = SRP_AER_RSP,
1242 .tag = req->tag,
1243 };
1244 s32 delta = be32_to_cpu(req->req_lim_delta);
1245
1246 shost_printk(KERN_ERR, target->scsi_host, PFX
1247 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1248
1249 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1250 shost_printk(KERN_ERR, target->scsi_host, PFX
1251 "problems processing SRP_AER_REQ\n");
1252 }
1253
1254 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1255 {
1256 struct ib_device *dev = target->srp_host->srp_dev->dev;
1257 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
1258 int res;
1259 u8 opcode;
1260
1261 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1262 DMA_FROM_DEVICE);
1263
1264 opcode = *(u8 *) iu->buf;
1265
1266 if (0) {
1267 shost_printk(KERN_ERR, target->scsi_host,
1268 PFX "recv completion, opcode 0x%02x\n", opcode);
1269 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1270 iu->buf, wc->byte_len, true);
1271 }
1272
1273 switch (opcode) {
1274 case SRP_RSP:
1275 srp_process_rsp(target, iu->buf);
1276 break;
1277
1278 case SRP_CRED_REQ:
1279 srp_process_cred_req(target, iu->buf);
1280 break;
1281
1282 case SRP_AER_REQ:
1283 srp_process_aer_req(target, iu->buf);
1284 break;
1285
1286 case SRP_T_LOGOUT:
1287 /* XXX Handle target logout */
1288 shost_printk(KERN_WARNING, target->scsi_host,
1289 PFX "Got target logout request\n");
1290 break;
1291
1292 default:
1293 shost_printk(KERN_WARNING, target->scsi_host,
1294 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1295 break;
1296 }
1297
1298 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1299 DMA_FROM_DEVICE);
1300
1301 res = srp_post_recv(target, iu);
1302 if (res != 0)
1303 shost_printk(KERN_ERR, target->scsi_host,
1304 PFX "Recv failed with error code %d\n", res);
1305 }
1306
1307 static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
1308 struct srp_target_port *target)
1309 {
1310 if (target->connected && !target->qp_in_error) {
1311 shost_printk(KERN_ERR, target->scsi_host,
1312 PFX "failed %s status %d\n",
1313 send_err ? "send" : "receive",
1314 wc_status);
1315 }
1316 target->qp_in_error = true;
1317 }
1318
1319 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1320 {
1321 struct srp_target_port *target = target_ptr;
1322 struct ib_wc wc;
1323
1324 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1325 while (ib_poll_cq(cq, 1, &wc) > 0) {
1326 if (likely(wc.status == IB_WC_SUCCESS)) {
1327 srp_handle_recv(target, &wc);
1328 } else {
1329 srp_handle_qp_err(wc.status, false, target);
1330 }
1331 }
1332 }
1333
1334 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1335 {
1336 struct srp_target_port *target = target_ptr;
1337 struct ib_wc wc;
1338 struct srp_iu *iu;
1339
1340 while (ib_poll_cq(cq, 1, &wc) > 0) {
1341 if (likely(wc.status == IB_WC_SUCCESS)) {
1342 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1343 list_add(&iu->list, &target->free_tx);
1344 } else {
1345 srp_handle_qp_err(wc.status, true, target);
1346 }
1347 }
1348 }
1349
1350 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1351 {
1352 struct srp_target_port *target = host_to_target(shost);
1353 struct srp_request *req;
1354 struct srp_iu *iu;
1355 struct srp_cmd *cmd;
1356 struct ib_device *dev;
1357 unsigned long flags;
1358 int len;
1359
1360 if (unlikely(target->transport_offline)) {
1361 scmnd->result = DID_NO_CONNECT << 16;
1362 scmnd->scsi_done(scmnd);
1363 return 0;
1364 }
1365
1366 spin_lock_irqsave(&target->lock, flags);
1367 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1368 if (!iu)
1369 goto err_unlock;
1370
1371 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1372 list_del(&req->list);
1373 spin_unlock_irqrestore(&target->lock, flags);
1374
1375 dev = target->srp_host->srp_dev->dev;
1376 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
1377 DMA_TO_DEVICE);
1378
1379 scmnd->result = 0;
1380 scmnd->host_scribble = (void *) req;
1381
1382 cmd = iu->buf;
1383 memset(cmd, 0, sizeof *cmd);
1384
1385 cmd->opcode = SRP_CMD;
1386 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1387 cmd->tag = req->index;
1388 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1389
1390 req->scmnd = scmnd;
1391 req->cmd = iu;
1392
1393 len = srp_map_data(scmnd, target, req);
1394 if (len < 0) {
1395 shost_printk(KERN_ERR, target->scsi_host,
1396 PFX "Failed to map data\n");
1397 goto err_iu;
1398 }
1399
1400 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
1401 DMA_TO_DEVICE);
1402
1403 if (srp_post_send(target, iu, len)) {
1404 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1405 goto err_unmap;
1406 }
1407
1408 return 0;
1409
1410 err_unmap:
1411 srp_unmap_data(scmnd, target, req);
1412
1413 err_iu:
1414 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1415
1416 /*
1417 * Avoid that the loops that iterate over the request ring can
1418 * encounter a dangling SCSI command pointer.
1419 */
1420 req->scmnd = NULL;
1421
1422 spin_lock_irqsave(&target->lock, flags);
1423 list_add(&req->list, &target->free_reqs);
1424
1425 err_unlock:
1426 spin_unlock_irqrestore(&target->lock, flags);
1427
1428 return SCSI_MLQUEUE_HOST_BUSY;
1429 }
1430
1431 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1432 {
1433 int i;
1434
1435 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1436 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1437 target->max_ti_iu_len,
1438 GFP_KERNEL, DMA_FROM_DEVICE);
1439 if (!target->rx_ring[i])
1440 goto err;
1441 }
1442
1443 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1444 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1445 target->max_iu_len,
1446 GFP_KERNEL, DMA_TO_DEVICE);
1447 if (!target->tx_ring[i])
1448 goto err;
1449
1450 list_add(&target->tx_ring[i]->list, &target->free_tx);
1451 }
1452
1453 return 0;
1454
1455 err:
1456 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1457 srp_free_iu(target->srp_host, target->rx_ring[i]);
1458 target->rx_ring[i] = NULL;
1459 }
1460
1461 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1462 srp_free_iu(target->srp_host, target->tx_ring[i]);
1463 target->tx_ring[i] = NULL;
1464 }
1465
1466 return -ENOMEM;
1467 }
1468
1469 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1470 {
1471 uint64_t T_tr_ns, max_compl_time_ms;
1472 uint32_t rq_tmo_jiffies;
1473
1474 /*
1475 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1476 * table 91), both the QP timeout and the retry count have to be set
1477 * for RC QP's during the RTR to RTS transition.
1478 */
1479 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1480 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1481
1482 /*
1483 * Set target->rq_tmo_jiffies to one second more than the largest time
1484 * it can take before an error completion is generated. See also
1485 * C9-140..142 in the IBTA spec for more information about how to
1486 * convert the QP Local ACK Timeout value to nanoseconds.
1487 */
1488 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1489 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1490 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1491 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1492
1493 return rq_tmo_jiffies;
1494 }
1495
1496 static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1497 struct srp_login_rsp *lrsp,
1498 struct srp_target_port *target)
1499 {
1500 struct ib_qp_attr *qp_attr = NULL;
1501 int attr_mask = 0;
1502 int ret;
1503 int i;
1504
1505 if (lrsp->opcode == SRP_LOGIN_RSP) {
1506 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1507 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1508
1509 /*
1510 * Reserve credits for task management so we don't
1511 * bounce requests back to the SCSI mid-layer.
1512 */
1513 target->scsi_host->can_queue
1514 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1515 target->scsi_host->can_queue);
1516 } else {
1517 shost_printk(KERN_WARNING, target->scsi_host,
1518 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1519 ret = -ECONNRESET;
1520 goto error;
1521 }
1522
1523 if (!target->rx_ring[0]) {
1524 ret = srp_alloc_iu_bufs(target);
1525 if (ret)
1526 goto error;
1527 }
1528
1529 ret = -ENOMEM;
1530 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1531 if (!qp_attr)
1532 goto error;
1533
1534 qp_attr->qp_state = IB_QPS_RTR;
1535 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1536 if (ret)
1537 goto error_free;
1538
1539 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1540 if (ret)
1541 goto error_free;
1542
1543 for (i = 0; i < SRP_RQ_SIZE; i++) {
1544 struct srp_iu *iu = target->rx_ring[i];
1545 ret = srp_post_recv(target, iu);
1546 if (ret)
1547 goto error_free;
1548 }
1549
1550 qp_attr->qp_state = IB_QPS_RTS;
1551 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1552 if (ret)
1553 goto error_free;
1554
1555 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1556
1557 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1558 if (ret)
1559 goto error_free;
1560
1561 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1562
1563 error_free:
1564 kfree(qp_attr);
1565
1566 error:
1567 target->status = ret;
1568 }
1569
1570 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1571 struct ib_cm_event *event,
1572 struct srp_target_port *target)
1573 {
1574 struct Scsi_Host *shost = target->scsi_host;
1575 struct ib_class_port_info *cpi;
1576 int opcode;
1577
1578 switch (event->param.rej_rcvd.reason) {
1579 case IB_CM_REJ_PORT_CM_REDIRECT:
1580 cpi = event->param.rej_rcvd.ari;
1581 target->path.dlid = cpi->redirect_lid;
1582 target->path.pkey = cpi->redirect_pkey;
1583 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1584 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1585
1586 target->status = target->path.dlid ?
1587 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1588 break;
1589
1590 case IB_CM_REJ_PORT_REDIRECT:
1591 if (srp_target_is_topspin(target)) {
1592 /*
1593 * Topspin/Cisco SRP gateways incorrectly send
1594 * reject reason code 25 when they mean 24
1595 * (port redirect).
1596 */
1597 memcpy(target->path.dgid.raw,
1598 event->param.rej_rcvd.ari, 16);
1599
1600 shost_printk(KERN_DEBUG, shost,
1601 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1602 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1603 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1604
1605 target->status = SRP_PORT_REDIRECT;
1606 } else {
1607 shost_printk(KERN_WARNING, shost,
1608 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1609 target->status = -ECONNRESET;
1610 }
1611 break;
1612
1613 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1614 shost_printk(KERN_WARNING, shost,
1615 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1616 target->status = -ECONNRESET;
1617 break;
1618
1619 case IB_CM_REJ_CONSUMER_DEFINED:
1620 opcode = *(u8 *) event->private_data;
1621 if (opcode == SRP_LOGIN_REJ) {
1622 struct srp_login_rej *rej = event->private_data;
1623 u32 reason = be32_to_cpu(rej->reason);
1624
1625 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1626 shost_printk(KERN_WARNING, shost,
1627 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1628 else
1629 shost_printk(KERN_WARNING, shost,
1630 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1631 } else
1632 shost_printk(KERN_WARNING, shost,
1633 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1634 " opcode 0x%02x\n", opcode);
1635 target->status = -ECONNRESET;
1636 break;
1637
1638 case IB_CM_REJ_STALE_CONN:
1639 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1640 target->status = SRP_STALE_CONN;
1641 break;
1642
1643 default:
1644 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1645 event->param.rej_rcvd.reason);
1646 target->status = -ECONNRESET;
1647 }
1648 }
1649
1650 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1651 {
1652 struct srp_target_port *target = cm_id->context;
1653 int comp = 0;
1654
1655 switch (event->event) {
1656 case IB_CM_REQ_ERROR:
1657 shost_printk(KERN_DEBUG, target->scsi_host,
1658 PFX "Sending CM REQ failed\n");
1659 comp = 1;
1660 target->status = -ECONNRESET;
1661 break;
1662
1663 case IB_CM_REP_RECEIVED:
1664 comp = 1;
1665 srp_cm_rep_handler(cm_id, event->private_data, target);
1666 break;
1667
1668 case IB_CM_REJ_RECEIVED:
1669 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1670 comp = 1;
1671
1672 srp_cm_rej_handler(cm_id, event, target);
1673 break;
1674
1675 case IB_CM_DREQ_RECEIVED:
1676 shost_printk(KERN_WARNING, target->scsi_host,
1677 PFX "DREQ received - connection closed\n");
1678 srp_change_conn_state(target, false);
1679 if (ib_send_cm_drep(cm_id, NULL, 0))
1680 shost_printk(KERN_ERR, target->scsi_host,
1681 PFX "Sending CM DREP failed\n");
1682 break;
1683
1684 case IB_CM_TIMEWAIT_EXIT:
1685 shost_printk(KERN_ERR, target->scsi_host,
1686 PFX "connection closed\n");
1687
1688 target->status = 0;
1689 break;
1690
1691 case IB_CM_MRA_RECEIVED:
1692 case IB_CM_DREQ_ERROR:
1693 case IB_CM_DREP_RECEIVED:
1694 break;
1695
1696 default:
1697 shost_printk(KERN_WARNING, target->scsi_host,
1698 PFX "Unhandled CM event %d\n", event->event);
1699 break;
1700 }
1701
1702 if (comp)
1703 complete(&target->done);
1704
1705 return 0;
1706 }
1707
1708 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1709 u64 req_tag, unsigned int lun, u8 func)
1710 {
1711 struct ib_device *dev = target->srp_host->srp_dev->dev;
1712 struct srp_iu *iu;
1713 struct srp_tsk_mgmt *tsk_mgmt;
1714
1715 if (!target->connected || target->qp_in_error)
1716 return -1;
1717
1718 init_completion(&target->tsk_mgmt_done);
1719
1720 spin_lock_irq(&target->lock);
1721 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1722 spin_unlock_irq(&target->lock);
1723
1724 if (!iu)
1725 return -1;
1726
1727 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1728 DMA_TO_DEVICE);
1729 tsk_mgmt = iu->buf;
1730 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1731
1732 tsk_mgmt->opcode = SRP_TSK_MGMT;
1733 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1734 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
1735 tsk_mgmt->tsk_mgmt_func = func;
1736 tsk_mgmt->task_tag = req_tag;
1737
1738 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1739 DMA_TO_DEVICE);
1740 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
1741 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
1742 return -1;
1743 }
1744
1745 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
1746 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1747 return -1;
1748
1749 return 0;
1750 }
1751
1752 static int srp_abort(struct scsi_cmnd *scmnd)
1753 {
1754 struct srp_target_port *target = host_to_target(scmnd->device->host);
1755 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
1756 int ret;
1757
1758 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1759
1760 if (!req || !srp_claim_req(target, req, scmnd))
1761 return SUCCESS;
1762 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
1763 SRP_TSK_ABORT_TASK) == 0)
1764 ret = SUCCESS;
1765 else if (target->transport_offline)
1766 ret = FAST_IO_FAIL;
1767 else
1768 ret = FAILED;
1769 srp_free_req(target, req, scmnd, 0);
1770 scmnd->result = DID_ABORT << 16;
1771 scmnd->scsi_done(scmnd);
1772
1773 return ret;
1774 }
1775
1776 static int srp_reset_device(struct scsi_cmnd *scmnd)
1777 {
1778 struct srp_target_port *target = host_to_target(scmnd->device->host);
1779 int i;
1780
1781 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1782
1783 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
1784 SRP_TSK_LUN_RESET))
1785 return FAILED;
1786 if (target->tsk_mgmt_status)
1787 return FAILED;
1788
1789 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1790 struct srp_request *req = &target->req_ring[i];
1791 if (req->scmnd && req->scmnd->device == scmnd->device)
1792 srp_reset_req(target, req);
1793 }
1794
1795 return SUCCESS;
1796 }
1797
1798 static int srp_reset_host(struct scsi_cmnd *scmnd)
1799 {
1800 struct srp_target_port *target = host_to_target(scmnd->device->host);
1801 int ret = FAILED;
1802
1803 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1804
1805 if (!srp_reconnect_target(target))
1806 ret = SUCCESS;
1807
1808 return ret;
1809 }
1810
1811 static int srp_slave_configure(struct scsi_device *sdev)
1812 {
1813 struct Scsi_Host *shost = sdev->host;
1814 struct srp_target_port *target = host_to_target(shost);
1815 struct request_queue *q = sdev->request_queue;
1816 unsigned long timeout;
1817
1818 if (sdev->type == TYPE_DISK) {
1819 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
1820 blk_queue_rq_timeout(q, timeout);
1821 }
1822
1823 return 0;
1824 }
1825
1826 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1827 char *buf)
1828 {
1829 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1830
1831 return sprintf(buf, "0x%016llx\n",
1832 (unsigned long long) be64_to_cpu(target->id_ext));
1833 }
1834
1835 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1836 char *buf)
1837 {
1838 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1839
1840 return sprintf(buf, "0x%016llx\n",
1841 (unsigned long long) be64_to_cpu(target->ioc_guid));
1842 }
1843
1844 static ssize_t show_service_id(struct device *dev,
1845 struct device_attribute *attr, char *buf)
1846 {
1847 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1848
1849 return sprintf(buf, "0x%016llx\n",
1850 (unsigned long long) be64_to_cpu(target->service_id));
1851 }
1852
1853 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1854 char *buf)
1855 {
1856 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1857
1858 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1859 }
1860
1861 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1862 char *buf)
1863 {
1864 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1865
1866 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1867 }
1868
1869 static ssize_t show_orig_dgid(struct device *dev,
1870 struct device_attribute *attr, char *buf)
1871 {
1872 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1873
1874 return sprintf(buf, "%pI6\n", target->orig_dgid);
1875 }
1876
1877 static ssize_t show_req_lim(struct device *dev,
1878 struct device_attribute *attr, char *buf)
1879 {
1880 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1881
1882 return sprintf(buf, "%d\n", target->req_lim);
1883 }
1884
1885 static ssize_t show_zero_req_lim(struct device *dev,
1886 struct device_attribute *attr, char *buf)
1887 {
1888 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1889
1890 return sprintf(buf, "%d\n", target->zero_req_lim);
1891 }
1892
1893 static ssize_t show_local_ib_port(struct device *dev,
1894 struct device_attribute *attr, char *buf)
1895 {
1896 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1897
1898 return sprintf(buf, "%d\n", target->srp_host->port);
1899 }
1900
1901 static ssize_t show_local_ib_device(struct device *dev,
1902 struct device_attribute *attr, char *buf)
1903 {
1904 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1905
1906 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1907 }
1908
1909 static ssize_t show_comp_vector(struct device *dev,
1910 struct device_attribute *attr, char *buf)
1911 {
1912 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1913
1914 return sprintf(buf, "%d\n", target->comp_vector);
1915 }
1916
1917 static ssize_t show_cmd_sg_entries(struct device *dev,
1918 struct device_attribute *attr, char *buf)
1919 {
1920 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1921
1922 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
1923 }
1924
1925 static ssize_t show_allow_ext_sg(struct device *dev,
1926 struct device_attribute *attr, char *buf)
1927 {
1928 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1929
1930 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
1931 }
1932
1933 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1934 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1935 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1936 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1937 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1938 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1939 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
1940 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1941 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1942 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1943 static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
1944 static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
1945 static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
1946
1947 static struct device_attribute *srp_host_attrs[] = {
1948 &dev_attr_id_ext,
1949 &dev_attr_ioc_guid,
1950 &dev_attr_service_id,
1951 &dev_attr_pkey,
1952 &dev_attr_dgid,
1953 &dev_attr_orig_dgid,
1954 &dev_attr_req_lim,
1955 &dev_attr_zero_req_lim,
1956 &dev_attr_local_ib_port,
1957 &dev_attr_local_ib_device,
1958 &dev_attr_comp_vector,
1959 &dev_attr_cmd_sg_entries,
1960 &dev_attr_allow_ext_sg,
1961 NULL
1962 };
1963
1964 static struct scsi_host_template srp_template = {
1965 .module = THIS_MODULE,
1966 .name = "InfiniBand SRP initiator",
1967 .proc_name = DRV_NAME,
1968 .slave_configure = srp_slave_configure,
1969 .info = srp_target_info,
1970 .queuecommand = srp_queuecommand,
1971 .eh_abort_handler = srp_abort,
1972 .eh_device_reset_handler = srp_reset_device,
1973 .eh_host_reset_handler = srp_reset_host,
1974 .skip_settle_delay = true,
1975 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
1976 .can_queue = SRP_CMD_SQ_SIZE,
1977 .this_id = -1,
1978 .cmd_per_lun = SRP_CMD_SQ_SIZE,
1979 .use_clustering = ENABLE_CLUSTERING,
1980 .shost_attrs = srp_host_attrs
1981 };
1982
1983 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1984 {
1985 struct srp_rport_identifiers ids;
1986 struct srp_rport *rport;
1987
1988 sprintf(target->target_name, "SRP.T10:%016llX",
1989 (unsigned long long) be64_to_cpu(target->id_ext));
1990
1991 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1992 return -ENODEV;
1993
1994 memcpy(ids.port_id, &target->id_ext, 8);
1995 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1996 ids.roles = SRP_RPORT_ROLE_TARGET;
1997 rport = srp_rport_add(target->scsi_host, &ids);
1998 if (IS_ERR(rport)) {
1999 scsi_remove_host(target->scsi_host);
2000 return PTR_ERR(rport);
2001 }
2002
2003 rport->lld_data = target;
2004
2005 spin_lock(&host->target_lock);
2006 list_add_tail(&target->list, &host->target_list);
2007 spin_unlock(&host->target_lock);
2008
2009 target->state = SRP_TARGET_LIVE;
2010
2011 scsi_scan_target(&target->scsi_host->shost_gendev,
2012 0, target->scsi_id, SCAN_WILD_CARD, 0);
2013
2014 return 0;
2015 }
2016
2017 static void srp_release_dev(struct device *dev)
2018 {
2019 struct srp_host *host =
2020 container_of(dev, struct srp_host, dev);
2021
2022 complete(&host->released);
2023 }
2024
2025 static struct class srp_class = {
2026 .name = "infiniband_srp",
2027 .dev_release = srp_release_dev
2028 };
2029
2030 /**
2031 * srp_conn_unique() - check whether the connection to a target is unique
2032 */
2033 static bool srp_conn_unique(struct srp_host *host,
2034 struct srp_target_port *target)
2035 {
2036 struct srp_target_port *t;
2037 bool ret = false;
2038
2039 if (target->state == SRP_TARGET_REMOVED)
2040 goto out;
2041
2042 ret = true;
2043
2044 spin_lock(&host->target_lock);
2045 list_for_each_entry(t, &host->target_list, list) {
2046 if (t != target &&
2047 target->id_ext == t->id_ext &&
2048 target->ioc_guid == t->ioc_guid &&
2049 target->initiator_ext == t->initiator_ext) {
2050 ret = false;
2051 break;
2052 }
2053 }
2054 spin_unlock(&host->target_lock);
2055
2056 out:
2057 return ret;
2058 }
2059
2060 /*
2061 * Target ports are added by writing
2062 *
2063 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2064 * pkey=<P_Key>,service_id=<service ID>
2065 *
2066 * to the add_target sysfs attribute.
2067 */
2068 enum {
2069 SRP_OPT_ERR = 0,
2070 SRP_OPT_ID_EXT = 1 << 0,
2071 SRP_OPT_IOC_GUID = 1 << 1,
2072 SRP_OPT_DGID = 1 << 2,
2073 SRP_OPT_PKEY = 1 << 3,
2074 SRP_OPT_SERVICE_ID = 1 << 4,
2075 SRP_OPT_MAX_SECT = 1 << 5,
2076 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
2077 SRP_OPT_IO_CLASS = 1 << 7,
2078 SRP_OPT_INITIATOR_EXT = 1 << 8,
2079 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
2080 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2081 SRP_OPT_SG_TABLESIZE = 1 << 11,
2082 SRP_OPT_COMP_VECTOR = 1 << 12,
2083 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2084 SRP_OPT_IOC_GUID |
2085 SRP_OPT_DGID |
2086 SRP_OPT_PKEY |
2087 SRP_OPT_SERVICE_ID),
2088 };
2089
2090 static const match_table_t srp_opt_tokens = {
2091 { SRP_OPT_ID_EXT, "id_ext=%s" },
2092 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2093 { SRP_OPT_DGID, "dgid=%s" },
2094 { SRP_OPT_PKEY, "pkey=%x" },
2095 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2096 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2097 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
2098 { SRP_OPT_IO_CLASS, "io_class=%x" },
2099 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
2100 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
2101 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2102 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
2103 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
2104 { SRP_OPT_ERR, NULL }
2105 };
2106
2107 static int srp_parse_options(const char *buf, struct srp_target_port *target)
2108 {
2109 char *options, *sep_opt;
2110 char *p;
2111 char dgid[3];
2112 substring_t args[MAX_OPT_ARGS];
2113 int opt_mask = 0;
2114 int token;
2115 int ret = -EINVAL;
2116 int i;
2117
2118 options = kstrdup(buf, GFP_KERNEL);
2119 if (!options)
2120 return -ENOMEM;
2121
2122 sep_opt = options;
2123 while ((p = strsep(&sep_opt, ",")) != NULL) {
2124 if (!*p)
2125 continue;
2126
2127 token = match_token(p, srp_opt_tokens, args);
2128 opt_mask |= token;
2129
2130 switch (token) {
2131 case SRP_OPT_ID_EXT:
2132 p = match_strdup(args);
2133 if (!p) {
2134 ret = -ENOMEM;
2135 goto out;
2136 }
2137 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2138 kfree(p);
2139 break;
2140
2141 case SRP_OPT_IOC_GUID:
2142 p = match_strdup(args);
2143 if (!p) {
2144 ret = -ENOMEM;
2145 goto out;
2146 }
2147 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2148 kfree(p);
2149 break;
2150
2151 case SRP_OPT_DGID:
2152 p = match_strdup(args);
2153 if (!p) {
2154 ret = -ENOMEM;
2155 goto out;
2156 }
2157 if (strlen(p) != 32) {
2158 pr_warn("bad dest GID parameter '%s'\n", p);
2159 kfree(p);
2160 goto out;
2161 }
2162
2163 for (i = 0; i < 16; ++i) {
2164 strlcpy(dgid, p + i * 2, 3);
2165 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2166 }
2167 kfree(p);
2168 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
2169 break;
2170
2171 case SRP_OPT_PKEY:
2172 if (match_hex(args, &token)) {
2173 pr_warn("bad P_Key parameter '%s'\n", p);
2174 goto out;
2175 }
2176 target->path.pkey = cpu_to_be16(token);
2177 break;
2178
2179 case SRP_OPT_SERVICE_ID:
2180 p = match_strdup(args);
2181 if (!p) {
2182 ret = -ENOMEM;
2183 goto out;
2184 }
2185 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2186 target->path.service_id = target->service_id;
2187 kfree(p);
2188 break;
2189
2190 case SRP_OPT_MAX_SECT:
2191 if (match_int(args, &token)) {
2192 pr_warn("bad max sect parameter '%s'\n", p);
2193 goto out;
2194 }
2195 target->scsi_host->max_sectors = token;
2196 break;
2197
2198 case SRP_OPT_MAX_CMD_PER_LUN:
2199 if (match_int(args, &token)) {
2200 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2201 p);
2202 goto out;
2203 }
2204 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
2205 break;
2206
2207 case SRP_OPT_IO_CLASS:
2208 if (match_hex(args, &token)) {
2209 pr_warn("bad IO class parameter '%s'\n", p);
2210 goto out;
2211 }
2212 if (token != SRP_REV10_IB_IO_CLASS &&
2213 token != SRP_REV16A_IB_IO_CLASS) {
2214 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2215 token, SRP_REV10_IB_IO_CLASS,
2216 SRP_REV16A_IB_IO_CLASS);
2217 goto out;
2218 }
2219 target->io_class = token;
2220 break;
2221
2222 case SRP_OPT_INITIATOR_EXT:
2223 p = match_strdup(args);
2224 if (!p) {
2225 ret = -ENOMEM;
2226 goto out;
2227 }
2228 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2229 kfree(p);
2230 break;
2231
2232 case SRP_OPT_CMD_SG_ENTRIES:
2233 if (match_int(args, &token) || token < 1 || token > 255) {
2234 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2235 p);
2236 goto out;
2237 }
2238 target->cmd_sg_cnt = token;
2239 break;
2240
2241 case SRP_OPT_ALLOW_EXT_SG:
2242 if (match_int(args, &token)) {
2243 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
2244 goto out;
2245 }
2246 target->allow_ext_sg = !!token;
2247 break;
2248
2249 case SRP_OPT_SG_TABLESIZE:
2250 if (match_int(args, &token) || token < 1 ||
2251 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
2252 pr_warn("bad max sg_tablesize parameter '%s'\n",
2253 p);
2254 goto out;
2255 }
2256 target->sg_tablesize = token;
2257 break;
2258
2259 case SRP_OPT_COMP_VECTOR:
2260 if (match_int(args, &token) || token < 0) {
2261 pr_warn("bad comp_vector parameter '%s'\n", p);
2262 goto out;
2263 }
2264 target->comp_vector = token;
2265 break;
2266
2267 default:
2268 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2269 p);
2270 goto out;
2271 }
2272 }
2273
2274 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2275 ret = 0;
2276 else
2277 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2278 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2279 !(srp_opt_tokens[i].token & opt_mask))
2280 pr_warn("target creation request is missing parameter '%s'\n",
2281 srp_opt_tokens[i].pattern);
2282
2283 out:
2284 kfree(options);
2285 return ret;
2286 }
2287
2288 static ssize_t srp_create_target(struct device *dev,
2289 struct device_attribute *attr,
2290 const char *buf, size_t count)
2291 {
2292 struct srp_host *host =
2293 container_of(dev, struct srp_host, dev);
2294 struct Scsi_Host *target_host;
2295 struct srp_target_port *target;
2296 struct ib_device *ibdev = host->srp_dev->dev;
2297 dma_addr_t dma_addr;
2298 int i, ret;
2299
2300 target_host = scsi_host_alloc(&srp_template,
2301 sizeof (struct srp_target_port));
2302 if (!target_host)
2303 return -ENOMEM;
2304
2305 target_host->transportt = ib_srp_transport_template;
2306 target_host->max_channel = 0;
2307 target_host->max_id = 1;
2308 target_host->max_lun = SRP_MAX_LUN;
2309 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
2310
2311 target = host_to_target(target_host);
2312
2313 target->io_class = SRP_REV16A_IB_IO_CLASS;
2314 target->scsi_host = target_host;
2315 target->srp_host = host;
2316 target->lkey = host->srp_dev->mr->lkey;
2317 target->rkey = host->srp_dev->mr->rkey;
2318 target->cmd_sg_cnt = cmd_sg_entries;
2319 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2320 target->allow_ext_sg = allow_ext_sg;
2321
2322 ret = srp_parse_options(buf, target);
2323 if (ret)
2324 goto err;
2325
2326 if (!srp_conn_unique(target->srp_host, target)) {
2327 shost_printk(KERN_INFO, target->scsi_host,
2328 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2329 be64_to_cpu(target->id_ext),
2330 be64_to_cpu(target->ioc_guid),
2331 be64_to_cpu(target->initiator_ext));
2332 ret = -EEXIST;
2333 goto err;
2334 }
2335
2336 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2337 target->cmd_sg_cnt < target->sg_tablesize) {
2338 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
2339 target->sg_tablesize = target->cmd_sg_cnt;
2340 }
2341
2342 target_host->sg_tablesize = target->sg_tablesize;
2343 target->indirect_size = target->sg_tablesize *
2344 sizeof (struct srp_direct_buf);
2345 target->max_iu_len = sizeof (struct srp_cmd) +
2346 sizeof (struct srp_indirect_buf) +
2347 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2348
2349 INIT_WORK(&target->remove_work, srp_remove_work);
2350 spin_lock_init(&target->lock);
2351 INIT_LIST_HEAD(&target->free_tx);
2352 INIT_LIST_HEAD(&target->free_reqs);
2353 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
2354 struct srp_request *req = &target->req_ring[i];
2355
2356 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *),
2357 GFP_KERNEL);
2358 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *),
2359 GFP_KERNEL);
2360 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
2361 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
2362 goto err_free_mem;
2363
2364 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
2365 target->indirect_size,
2366 DMA_TO_DEVICE);
2367 if (ib_dma_mapping_error(ibdev, dma_addr))
2368 goto err_free_mem;
2369
2370 req->indirect_dma_addr = dma_addr;
2371 req->index = i;
2372 list_add_tail(&req->list, &target->free_reqs);
2373 }
2374
2375 ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2376
2377 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2378 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
2379 "service_id %016llx dgid %pI6\n",
2380 (unsigned long long) be64_to_cpu(target->id_ext),
2381 (unsigned long long) be64_to_cpu(target->ioc_guid),
2382 be16_to_cpu(target->path.pkey),
2383 (unsigned long long) be64_to_cpu(target->service_id),
2384 target->path.dgid.raw);
2385
2386 ret = srp_create_target_ib(target);
2387 if (ret)
2388 goto err_free_mem;
2389
2390 ret = srp_new_cm_id(target);
2391 if (ret)
2392 goto err_free_ib;
2393
2394 ret = srp_connect_target(target);
2395 if (ret) {
2396 shost_printk(KERN_ERR, target->scsi_host,
2397 PFX "Connection failed\n");
2398 goto err_cm_id;
2399 }
2400
2401 ret = srp_add_target(host, target);
2402 if (ret)
2403 goto err_disconnect;
2404
2405 return count;
2406
2407 err_disconnect:
2408 srp_disconnect_target(target);
2409
2410 err_cm_id:
2411 ib_destroy_cm_id(target->cm_id);
2412
2413 err_free_ib:
2414 srp_free_target_ib(target);
2415
2416 err_free_mem:
2417 srp_free_req_data(target);
2418
2419 err:
2420 scsi_host_put(target_host);
2421
2422 return ret;
2423 }
2424
2425 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2426
2427 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2428 char *buf)
2429 {
2430 struct srp_host *host = container_of(dev, struct srp_host, dev);
2431
2432 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2433 }
2434
2435 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2436
2437 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2438 char *buf)
2439 {
2440 struct srp_host *host = container_of(dev, struct srp_host, dev);
2441
2442 return sprintf(buf, "%d\n", host->port);
2443 }
2444
2445 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2446
2447 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2448 {
2449 struct srp_host *host;
2450
2451 host = kzalloc(sizeof *host, GFP_KERNEL);
2452 if (!host)
2453 return NULL;
2454
2455 INIT_LIST_HEAD(&host->target_list);
2456 spin_lock_init(&host->target_lock);
2457 init_completion(&host->released);
2458 host->srp_dev = device;
2459 host->port = port;
2460
2461 host->dev.class = &srp_class;
2462 host->dev.parent = device->dev->dma_device;
2463 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2464
2465 if (device_register(&host->dev))
2466 goto free_host;
2467 if (device_create_file(&host->dev, &dev_attr_add_target))
2468 goto err_class;
2469 if (device_create_file(&host->dev, &dev_attr_ibdev))
2470 goto err_class;
2471 if (device_create_file(&host->dev, &dev_attr_port))
2472 goto err_class;
2473
2474 return host;
2475
2476 err_class:
2477 device_unregister(&host->dev);
2478
2479 free_host:
2480 kfree(host);
2481
2482 return NULL;
2483 }
2484
2485 static void srp_add_one(struct ib_device *device)
2486 {
2487 struct srp_device *srp_dev;
2488 struct ib_device_attr *dev_attr;
2489 struct ib_fmr_pool_param fmr_param;
2490 struct srp_host *host;
2491 int max_pages_per_fmr, fmr_page_shift, s, e, p;
2492
2493 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2494 if (!dev_attr)
2495 return;
2496
2497 if (ib_query_device(device, dev_attr)) {
2498 pr_warn("Query device failed for %s\n", device->name);
2499 goto free_attr;
2500 }
2501
2502 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2503 if (!srp_dev)
2504 goto free_attr;
2505
2506 /*
2507 * Use the smallest page size supported by the HCA, down to a
2508 * minimum of 4096 bytes. We're unlikely to build large sglists
2509 * out of smaller entries.
2510 */
2511 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2512 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2513 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2514 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
2515
2516 INIT_LIST_HEAD(&srp_dev->dev_list);
2517
2518 srp_dev->dev = device;
2519 srp_dev->pd = ib_alloc_pd(device);
2520 if (IS_ERR(srp_dev->pd))
2521 goto free_dev;
2522
2523 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2524 IB_ACCESS_LOCAL_WRITE |
2525 IB_ACCESS_REMOTE_READ |
2526 IB_ACCESS_REMOTE_WRITE);
2527 if (IS_ERR(srp_dev->mr))
2528 goto err_pd;
2529
2530 for (max_pages_per_fmr = SRP_FMR_SIZE;
2531 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2532 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2533 memset(&fmr_param, 0, sizeof fmr_param);
2534 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2535 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2536 fmr_param.cache = 1;
2537 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2538 fmr_param.page_shift = fmr_page_shift;
2539 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2540 IB_ACCESS_REMOTE_WRITE |
2541 IB_ACCESS_REMOTE_READ);
2542
2543 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2544 if (!IS_ERR(srp_dev->fmr_pool))
2545 break;
2546 }
2547
2548 if (IS_ERR(srp_dev->fmr_pool))
2549 srp_dev->fmr_pool = NULL;
2550
2551 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2552 s = 0;
2553 e = 0;
2554 } else {
2555 s = 1;
2556 e = device->phys_port_cnt;
2557 }
2558
2559 for (p = s; p <= e; ++p) {
2560 host = srp_add_port(srp_dev, p);
2561 if (host)
2562 list_add_tail(&host->list, &srp_dev->dev_list);
2563 }
2564
2565 ib_set_client_data(device, &srp_client, srp_dev);
2566
2567 goto free_attr;
2568
2569 err_pd:
2570 ib_dealloc_pd(srp_dev->pd);
2571
2572 free_dev:
2573 kfree(srp_dev);
2574
2575 free_attr:
2576 kfree(dev_attr);
2577 }
2578
2579 static void srp_remove_one(struct ib_device *device)
2580 {
2581 struct srp_device *srp_dev;
2582 struct srp_host *host, *tmp_host;
2583 struct srp_target_port *target;
2584
2585 srp_dev = ib_get_client_data(device, &srp_client);
2586 if (!srp_dev)
2587 return;
2588
2589 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2590 device_unregister(&host->dev);
2591 /*
2592 * Wait for the sysfs entry to go away, so that no new
2593 * target ports can be created.
2594 */
2595 wait_for_completion(&host->released);
2596
2597 /*
2598 * Remove all target ports.
2599 */
2600 spin_lock(&host->target_lock);
2601 list_for_each_entry(target, &host->target_list, list)
2602 srp_queue_remove_work(target);
2603 spin_unlock(&host->target_lock);
2604
2605 /*
2606 * Wait for tl_err and target port removal tasks.
2607 */
2608 flush_workqueue(system_long_wq);
2609 flush_workqueue(srp_remove_wq);
2610
2611 kfree(host);
2612 }
2613
2614 if (srp_dev->fmr_pool)
2615 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2616 ib_dereg_mr(srp_dev->mr);
2617 ib_dealloc_pd(srp_dev->pd);
2618
2619 kfree(srp_dev);
2620 }
2621
2622 static struct srp_function_template ib_srp_transport_functions = {
2623 .rport_delete = srp_rport_delete,
2624 };
2625
2626 static int __init srp_init_module(void)
2627 {
2628 int ret;
2629
2630 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2631
2632 if (srp_sg_tablesize) {
2633 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
2634 if (!cmd_sg_entries)
2635 cmd_sg_entries = srp_sg_tablesize;
2636 }
2637
2638 if (!cmd_sg_entries)
2639 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2640
2641 if (cmd_sg_entries > 255) {
2642 pr_warn("Clamping cmd_sg_entries to 255\n");
2643 cmd_sg_entries = 255;
2644 }
2645
2646 if (!indirect_sg_entries)
2647 indirect_sg_entries = cmd_sg_entries;
2648 else if (indirect_sg_entries < cmd_sg_entries) {
2649 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2650 cmd_sg_entries);
2651 indirect_sg_entries = cmd_sg_entries;
2652 }
2653
2654 srp_remove_wq = create_workqueue("srp_remove");
2655 if (IS_ERR(srp_remove_wq)) {
2656 ret = PTR_ERR(srp_remove_wq);
2657 goto out;
2658 }
2659
2660 ret = -ENOMEM;
2661 ib_srp_transport_template =
2662 srp_attach_transport(&ib_srp_transport_functions);
2663 if (!ib_srp_transport_template)
2664 goto destroy_wq;
2665
2666 ret = class_register(&srp_class);
2667 if (ret) {
2668 pr_err("couldn't register class infiniband_srp\n");
2669 goto release_tr;
2670 }
2671
2672 ib_sa_register_client(&srp_sa_client);
2673
2674 ret = ib_register_client(&srp_client);
2675 if (ret) {
2676 pr_err("couldn't register IB client\n");
2677 goto unreg_sa;
2678 }
2679
2680 out:
2681 return ret;
2682
2683 unreg_sa:
2684 ib_sa_unregister_client(&srp_sa_client);
2685 class_unregister(&srp_class);
2686
2687 release_tr:
2688 srp_release_transport(ib_srp_transport_template);
2689
2690 destroy_wq:
2691 destroy_workqueue(srp_remove_wq);
2692 goto out;
2693 }
2694
2695 static void __exit srp_cleanup_module(void)
2696 {
2697 ib_unregister_client(&srp_client);
2698 ib_sa_unregister_client(&srp_sa_client);
2699 class_unregister(&srp_class);
2700 srp_release_transport(ib_srp_transport_template);
2701 destroy_workqueue(srp_remove_wq);
2702 }
2703
2704 module_init(srp_init_module);
2705 module_exit(srp_cleanup_module);
Linux with added FPC-III support