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[SCSI] transport_srp: add rport roles attribute
[wrt350n-kernel.git] / drivers / infiniband / ulp / srp / ib_srp.c
blobe616c4fc6ff0046262fecf288c71ddf438787825
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 #include <scsi/scsi_transport_srp.h>
51
52 #include <rdma/ib_cache.h>
53
54 #include "ib_srp.h"
55
56 #define DRV_NAME "ib_srp"
57 #define PFX DRV_NAME ": "
58 #define DRV_VERSION "0.2"
59 #define DRV_RELDATE "November 1, 2005"
60
61 MODULE_AUTHOR("Roland Dreier");
62 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
63 "v" DRV_VERSION " (" DRV_RELDATE ")");
64 MODULE_LICENSE("Dual BSD/GPL");
65
66 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
67 static int srp_max_iu_len;
68
69 module_param(srp_sg_tablesize, int, 0444);
70 MODULE_PARM_DESC(srp_sg_tablesize,
71 "Max number of gather/scatter entries per I/O (default is 12)");
72
73 static int topspin_workarounds = 1;
74
75 module_param(topspin_workarounds, int, 0444);
76 MODULE_PARM_DESC(topspin_workarounds,
77 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
78
79 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
80
81 static int mellanox_workarounds = 1;
82
83 module_param(mellanox_workarounds, int, 0444);
84 MODULE_PARM_DESC(mellanox_workarounds,
85 "Enable workarounds for Mellanox SRP target bugs if != 0");
86
87 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
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_completion(struct ib_cq *cq, void *target_ptr);
92 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
93
94 static struct scsi_transport_template *ib_srp_transport_template;
95
96 static struct ib_client srp_client = {
97 .name = "srp",
98 .add = srp_add_one,
99 .remove = srp_remove_one
100 };
101
102 static struct ib_sa_client srp_sa_client;
103
104 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
105 {
106 return (struct srp_target_port *) host->hostdata;
107 }
108
109 static const char *srp_target_info(struct Scsi_Host *host)
110 {
111 return host_to_target(host)->target_name;
112 }
113
114 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
115 gfp_t gfp_mask,
116 enum dma_data_direction direction)
117 {
118 struct srp_iu *iu;
119
120 iu = kmalloc(sizeof *iu, gfp_mask);
121 if (!iu)
122 goto out;
123
124 iu->buf = kzalloc(size, gfp_mask);
125 if (!iu->buf)
126 goto out_free_iu;
127
128 iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction);
129 if (ib_dma_mapping_error(host->dev->dev, iu->dma))
130 goto out_free_buf;
131
132 iu->size = size;
133 iu->direction = direction;
134
135 return iu;
136
137 out_free_buf:
138 kfree(iu->buf);
139 out_free_iu:
140 kfree(iu);
141 out:
142 return NULL;
143 }
144
145 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
146 {
147 if (!iu)
148 return;
149
150 ib_dma_unmap_single(host->dev->dev, iu->dma, iu->size, iu->direction);
151 kfree(iu->buf);
152 kfree(iu);
153 }
154
155 static void srp_qp_event(struct ib_event *event, void *context)
156 {
157 printk(KERN_ERR PFX "QP event %d\n", event->event);
158 }
159
160 static int srp_init_qp(struct srp_target_port *target,
161 struct ib_qp *qp)
162 {
163 struct ib_qp_attr *attr;
164 int ret;
165
166 attr = kmalloc(sizeof *attr, GFP_KERNEL);
167 if (!attr)
168 return -ENOMEM;
169
170 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
171 target->srp_host->port,
172 be16_to_cpu(target->path.pkey),
173 &attr->pkey_index);
174 if (ret)
175 goto out;
176
177 attr->qp_state = IB_QPS_INIT;
178 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
179 IB_ACCESS_REMOTE_WRITE);
180 attr->port_num = target->srp_host->port;
181
182 ret = ib_modify_qp(qp, attr,
183 IB_QP_STATE |
184 IB_QP_PKEY_INDEX |
185 IB_QP_ACCESS_FLAGS |
186 IB_QP_PORT);
187
188 out:
189 kfree(attr);
190 return ret;
191 }
192
193 static int srp_create_target_ib(struct srp_target_port *target)
194 {
195 struct ib_qp_init_attr *init_attr;
196 int ret;
197
198 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
199 if (!init_attr)
200 return -ENOMEM;
201
202 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
203 NULL, target, SRP_CQ_SIZE, 0);
204 if (IS_ERR(target->cq)) {
205 ret = PTR_ERR(target->cq);
206 goto out;
207 }
208
209 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
210
211 init_attr->event_handler = srp_qp_event;
212 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
213 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
214 init_attr->cap.max_recv_sge = 1;
215 init_attr->cap.max_send_sge = 1;
216 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
217 init_attr->qp_type = IB_QPT_RC;
218 init_attr->send_cq = target->cq;
219 init_attr->recv_cq = target->cq;
220
221 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
222 if (IS_ERR(target->qp)) {
223 ret = PTR_ERR(target->qp);
224 ib_destroy_cq(target->cq);
225 goto out;
226 }
227
228 ret = srp_init_qp(target, target->qp);
229 if (ret) {
230 ib_destroy_qp(target->qp);
231 ib_destroy_cq(target->cq);
232 goto out;
233 }
234
235 out:
236 kfree(init_attr);
237 return ret;
238 }
239
240 static void srp_free_target_ib(struct srp_target_port *target)
241 {
242 int i;
243
244 ib_destroy_qp(target->qp);
245 ib_destroy_cq(target->cq);
246
247 for (i = 0; i < SRP_RQ_SIZE; ++i)
248 srp_free_iu(target->srp_host, target->rx_ring[i]);
249 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
250 srp_free_iu(target->srp_host, target->tx_ring[i]);
251 }
252
253 static void srp_path_rec_completion(int status,
254 struct ib_sa_path_rec *pathrec,
255 void *target_ptr)
256 {
257 struct srp_target_port *target = target_ptr;
258
259 target->status = status;
260 if (status)
261 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
262 else
263 target->path = *pathrec;
264 complete(&target->done);
265 }
266
267 static int srp_lookup_path(struct srp_target_port *target)
268 {
269 target->path.numb_path = 1;
270
271 init_completion(&target->done);
272
273 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
274 target->srp_host->dev->dev,
275 target->srp_host->port,
276 &target->path,
277 IB_SA_PATH_REC_DGID |
278 IB_SA_PATH_REC_SGID |
279 IB_SA_PATH_REC_NUMB_PATH |
280 IB_SA_PATH_REC_PKEY,
281 SRP_PATH_REC_TIMEOUT_MS,
282 GFP_KERNEL,
283 srp_path_rec_completion,
284 target, &target->path_query);
285 if (target->path_query_id < 0)
286 return target->path_query_id;
287
288 wait_for_completion(&target->done);
289
290 if (target->status < 0)
291 printk(KERN_WARNING PFX "Path record query failed\n");
292
293 return target->status;
294 }
295
296 static int srp_send_req(struct srp_target_port *target)
297 {
298 struct {
299 struct ib_cm_req_param param;
300 struct srp_login_req priv;
301 } *req = NULL;
302 int status;
303
304 req = kzalloc(sizeof *req, GFP_KERNEL);
305 if (!req)
306 return -ENOMEM;
307
308 req->param.primary_path = &target->path;
309 req->param.alternate_path = NULL;
310 req->param.service_id = target->service_id;
311 req->param.qp_num = target->qp->qp_num;
312 req->param.qp_type = target->qp->qp_type;
313 req->param.private_data = &req->priv;
314 req->param.private_data_len = sizeof req->priv;
315 req->param.flow_control = 1;
316
317 get_random_bytes(&req->param.starting_psn, 4);
318 req->param.starting_psn &= 0xffffff;
319
320 /*
321 * Pick some arbitrary defaults here; we could make these
322 * module parameters if anyone cared about setting them.
323 */
324 req->param.responder_resources = 4;
325 req->param.remote_cm_response_timeout = 20;
326 req->param.local_cm_response_timeout = 20;
327 req->param.retry_count = 7;
328 req->param.rnr_retry_count = 7;
329 req->param.max_cm_retries = 15;
330
331 req->priv.opcode = SRP_LOGIN_REQ;
332 req->priv.tag = 0;
333 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
334 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
335 SRP_BUF_FORMAT_INDIRECT);
336 /*
337 * In the published SRP specification (draft rev. 16a), the
338 * port identifier format is 8 bytes of ID extension followed
339 * by 8 bytes of GUID. Older drafts put the two halves in the
340 * opposite order, so that the GUID comes first.
341 *
342 * Targets conforming to these obsolete drafts can be
343 * recognized by the I/O Class they report.
344 */
345 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
346 memcpy(req->priv.initiator_port_id,
347 &target->path.sgid.global.interface_id, 8);
348 memcpy(req->priv.initiator_port_id + 8,
349 &target->initiator_ext, 8);
350 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
351 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
352 } else {
353 memcpy(req->priv.initiator_port_id,
354 &target->initiator_ext, 8);
355 memcpy(req->priv.initiator_port_id + 8,
356 &target->path.sgid.global.interface_id, 8);
357 memcpy(req->priv.target_port_id, &target->id_ext, 8);
358 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
359 }
360
361 /*
362 * Topspin/Cisco SRP targets will reject our login unless we
363 * zero out the first 8 bytes of our initiator port ID and set
364 * the second 8 bytes to the local node GUID.
365 */
366 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
367 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
368 "activated for target GUID %016llx\n",
369 (unsigned long long) be64_to_cpu(target->ioc_guid));
370 memset(req->priv.initiator_port_id, 0, 8);
371 memcpy(req->priv.initiator_port_id + 8,
372 &target->srp_host->dev->dev->node_guid, 8);
373 }
374
375 status = ib_send_cm_req(target->cm_id, &req->param);
376
377 kfree(req);
378
379 return status;
380 }
381
382 static void srp_disconnect_target(struct srp_target_port *target)
383 {
384 /* XXX should send SRP_I_LOGOUT request */
385
386 init_completion(&target->done);
387 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
388 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
389 return;
390 }
391 wait_for_completion(&target->done);
392 }
393
394 static void srp_remove_work(struct work_struct *work)
395 {
396 struct srp_target_port *target =
397 container_of(work, struct srp_target_port, work);
398
399 spin_lock_irq(target->scsi_host->host_lock);
400 if (target->state != SRP_TARGET_DEAD) {
401 spin_unlock_irq(target->scsi_host->host_lock);
402 return;
403 }
404 target->state = SRP_TARGET_REMOVED;
405 spin_unlock_irq(target->scsi_host->host_lock);
406
407 spin_lock(&target->srp_host->target_lock);
408 list_del(&target->list);
409 spin_unlock(&target->srp_host->target_lock);
410
411 srp_remove_host(target->scsi_host);
412 scsi_remove_host(target->scsi_host);
413 ib_destroy_cm_id(target->cm_id);
414 srp_free_target_ib(target);
415 scsi_host_put(target->scsi_host);
416 }
417
418 static int srp_connect_target(struct srp_target_port *target)
419 {
420 int ret;
421
422 ret = srp_lookup_path(target);
423 if (ret)
424 return ret;
425
426 while (1) {
427 init_completion(&target->done);
428 ret = srp_send_req(target);
429 if (ret)
430 return ret;
431 wait_for_completion(&target->done);
432
433 /*
434 * The CM event handling code will set status to
435 * SRP_PORT_REDIRECT if we get a port redirect REJ
436 * back, or SRP_DLID_REDIRECT if we get a lid/qp
437 * redirect REJ back.
438 */
439 switch (target->status) {
440 case 0:
441 return 0;
442
443 case SRP_PORT_REDIRECT:
444 ret = srp_lookup_path(target);
445 if (ret)
446 return ret;
447 break;
448
449 case SRP_DLID_REDIRECT:
450 break;
451
452 default:
453 return target->status;
454 }
455 }
456 }
457
458 static void srp_unmap_data(struct scsi_cmnd *scmnd,
459 struct srp_target_port *target,
460 struct srp_request *req)
461 {
462 if (!scsi_sglist(scmnd) ||
463 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
464 scmnd->sc_data_direction != DMA_FROM_DEVICE))
465 return;
466
467 if (req->fmr) {
468 ib_fmr_pool_unmap(req->fmr);
469 req->fmr = NULL;
470 }
471
472 ib_dma_unmap_sg(target->srp_host->dev->dev, scsi_sglist(scmnd),
473 scsi_sg_count(scmnd), scmnd->sc_data_direction);
474 }
475
476 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
477 {
478 srp_unmap_data(req->scmnd, target, req);
479 list_move_tail(&req->list, &target->free_reqs);
480 }
481
482 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
483 {
484 req->scmnd->result = DID_RESET << 16;
485 req->scmnd->scsi_done(req->scmnd);
486 srp_remove_req(target, req);
487 }
488
489 static int srp_reconnect_target(struct srp_target_port *target)
490 {
491 struct ib_cm_id *new_cm_id;
492 struct ib_qp_attr qp_attr;
493 struct srp_request *req, *tmp;
494 struct ib_wc wc;
495 int ret;
496
497 spin_lock_irq(target->scsi_host->host_lock);
498 if (target->state != SRP_TARGET_LIVE) {
499 spin_unlock_irq(target->scsi_host->host_lock);
500 return -EAGAIN;
501 }
502 target->state = SRP_TARGET_CONNECTING;
503 spin_unlock_irq(target->scsi_host->host_lock);
504
505 srp_disconnect_target(target);
506 /*
507 * Now get a new local CM ID so that we avoid confusing the
508 * target in case things are really fouled up.
509 */
510 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
511 srp_cm_handler, target);
512 if (IS_ERR(new_cm_id)) {
513 ret = PTR_ERR(new_cm_id);
514 goto err;
515 }
516 ib_destroy_cm_id(target->cm_id);
517 target->cm_id = new_cm_id;
518
519 qp_attr.qp_state = IB_QPS_RESET;
520 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
521 if (ret)
522 goto err;
523
524 ret = srp_init_qp(target, target->qp);
525 if (ret)
526 goto err;
527
528 while (ib_poll_cq(target->cq, 1, &wc) > 0)
529 ; /* nothing */
530
531 spin_lock_irq(target->scsi_host->host_lock);
532 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
533 srp_reset_req(target, req);
534 spin_unlock_irq(target->scsi_host->host_lock);
535
536 target->rx_head = 0;
537 target->tx_head = 0;
538 target->tx_tail = 0;
539
540 target->qp_in_error = 0;
541 ret = srp_connect_target(target);
542 if (ret)
543 goto err;
544
545 spin_lock_irq(target->scsi_host->host_lock);
546 if (target->state == SRP_TARGET_CONNECTING) {
547 ret = 0;
548 target->state = SRP_TARGET_LIVE;
549 } else
550 ret = -EAGAIN;
551 spin_unlock_irq(target->scsi_host->host_lock);
552
553 return ret;
554
555 err:
556 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
557
558 /*
559 * We couldn't reconnect, so kill our target port off.
560 * However, we have to defer the real removal because we might
561 * be in the context of the SCSI error handler now, which
562 * would deadlock if we call scsi_remove_host().
563 */
564 spin_lock_irq(target->scsi_host->host_lock);
565 if (target->state == SRP_TARGET_CONNECTING) {
566 target->state = SRP_TARGET_DEAD;
567 INIT_WORK(&target->work, srp_remove_work);
568 schedule_work(&target->work);
569 }
570 spin_unlock_irq(target->scsi_host->host_lock);
571
572 return ret;
573 }
574
575 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
576 int sg_cnt, struct srp_request *req,
577 struct srp_direct_buf *buf)
578 {
579 u64 io_addr = 0;
580 u64 *dma_pages;
581 u32 len;
582 int page_cnt;
583 int i, j;
584 int ret;
585 struct srp_device *dev = target->srp_host->dev;
586 struct ib_device *ibdev = dev->dev;
587 struct scatterlist *sg;
588
589 if (!dev->fmr_pool)
590 return -ENODEV;
591
592 if ((ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask) &&
593 mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3))
594 return -EINVAL;
595
596 len = page_cnt = 0;
597 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
598 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
599
600 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
601 if (i > 0)
602 return -EINVAL;
603 else
604 ++page_cnt;
605 }
606 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
607 ~dev->fmr_page_mask) {
608 if (i < sg_cnt - 1)
609 return -EINVAL;
610 else
611 ++page_cnt;
612 }
613
614 len += dma_len;
615 }
616
617 page_cnt += len >> dev->fmr_page_shift;
618 if (page_cnt > SRP_FMR_SIZE)
619 return -ENOMEM;
620
621 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
622 if (!dma_pages)
623 return -ENOMEM;
624
625 page_cnt = 0;
626 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
627 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
628
629 for (j = 0; j < dma_len; j += dev->fmr_page_size)
630 dma_pages[page_cnt++] =
631 (ib_sg_dma_address(ibdev, sg) &
632 dev->fmr_page_mask) + j;
633 }
634
635 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
636 dma_pages, page_cnt, io_addr);
637 if (IS_ERR(req->fmr)) {
638 ret = PTR_ERR(req->fmr);
639 req->fmr = NULL;
640 goto out;
641 }
642
643 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
644 ~dev->fmr_page_mask);
645 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
646 buf->len = cpu_to_be32(len);
647
648 ret = 0;
649
650 out:
651 kfree(dma_pages);
652
653 return ret;
654 }
655
656 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
657 struct srp_request *req)
658 {
659 struct scatterlist *scat;
660 struct srp_cmd *cmd = req->cmd->buf;
661 int len, nents, count;
662 u8 fmt = SRP_DATA_DESC_DIRECT;
663 struct srp_device *dev;
664 struct ib_device *ibdev;
665
666 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
667 return sizeof (struct srp_cmd);
668
669 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
670 scmnd->sc_data_direction != DMA_TO_DEVICE) {
671 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
672 scmnd->sc_data_direction);
673 return -EINVAL;
674 }
675
676 nents = scsi_sg_count(scmnd);
677 scat = scsi_sglist(scmnd);
678
679 dev = target->srp_host->dev;
680 ibdev = dev->dev;
681
682 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
683
684 fmt = SRP_DATA_DESC_DIRECT;
685 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
686
687 if (count == 1) {
688 /*
689 * The midlayer only generated a single gather/scatter
690 * entry, or DMA mapping coalesced everything to a
691 * single entry. So a direct descriptor along with
692 * the DMA MR suffices.
693 */
694 struct srp_direct_buf *buf = (void *) cmd->add_data;
695
696 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
697 buf->key = cpu_to_be32(dev->mr->rkey);
698 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
699 } else if (srp_map_fmr(target, scat, count, req,
700 (void *) cmd->add_data)) {
701 /*
702 * FMR mapping failed, and the scatterlist has more
703 * than one entry. Generate an indirect memory
704 * descriptor.
705 */
706 struct srp_indirect_buf *buf = (void *) cmd->add_data;
707 struct scatterlist *sg;
708 u32 datalen = 0;
709 int i;
710
711 fmt = SRP_DATA_DESC_INDIRECT;
712 len = sizeof (struct srp_cmd) +
713 sizeof (struct srp_indirect_buf) +
714 count * sizeof (struct srp_direct_buf);
715
716 scsi_for_each_sg(scmnd, sg, count, i) {
717 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
718
719 buf->desc_list[i].va =
720 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
721 buf->desc_list[i].key =
722 cpu_to_be32(dev->mr->rkey);
723 buf->desc_list[i].len = cpu_to_be32(dma_len);
724 datalen += dma_len;
725 }
726
727 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
728 cmd->data_out_desc_cnt = count;
729 else
730 cmd->data_in_desc_cnt = count;
731
732 buf->table_desc.va =
733 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
734 buf->table_desc.key =
735 cpu_to_be32(target->srp_host->dev->mr->rkey);
736 buf->table_desc.len =
737 cpu_to_be32(count * sizeof (struct srp_direct_buf));
738
739 buf->len = cpu_to_be32(datalen);
740 }
741
742 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
743 cmd->buf_fmt = fmt << 4;
744 else
745 cmd->buf_fmt = fmt;
746
747 return len;
748 }
749
750 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
751 {
752 struct srp_request *req;
753 struct scsi_cmnd *scmnd;
754 unsigned long flags;
755 s32 delta;
756
757 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
758
759 spin_lock_irqsave(target->scsi_host->host_lock, flags);
760
761 target->req_lim += delta;
762
763 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
764
765 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
766 if (be32_to_cpu(rsp->resp_data_len) < 4)
767 req->tsk_status = -1;
768 else
769 req->tsk_status = rsp->data[3];
770 complete(&req->done);
771 } else {
772 scmnd = req->scmnd;
773 if (!scmnd)
774 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
775 (unsigned long long) rsp->tag);
776 scmnd->result = rsp->status;
777
778 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
779 memcpy(scmnd->sense_buffer, rsp->data +
780 be32_to_cpu(rsp->resp_data_len),
781 min_t(int, be32_to_cpu(rsp->sense_data_len),
782 SCSI_SENSE_BUFFERSIZE));
783 }
784
785 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
786 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
787 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
788 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
789
790 if (!req->tsk_mgmt) {
791 scmnd->host_scribble = (void *) -1L;
792 scmnd->scsi_done(scmnd);
793
794 srp_remove_req(target, req);
795 } else
796 req->cmd_done = 1;
797 }
798
799 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
800 }
801
802 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
803 {
804 struct ib_device *dev;
805 struct srp_iu *iu;
806 u8 opcode;
807
808 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
809
810 dev = target->srp_host->dev->dev;
811 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
812 DMA_FROM_DEVICE);
813
814 opcode = *(u8 *) iu->buf;
815
816 if (0) {
817 int i;
818
819 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
820
821 for (i = 0; i < wc->byte_len; ++i) {
822 if (i % 8 == 0)
823 printk(KERN_ERR " [%02x] ", i);
824 printk(" %02x", ((u8 *) iu->buf)[i]);
825 if ((i + 1) % 8 == 0)
826 printk("\n");
827 }
828
829 if (wc->byte_len % 8)
830 printk("\n");
831 }
832
833 switch (opcode) {
834 case SRP_RSP:
835 srp_process_rsp(target, iu->buf);
836 break;
837
838 case SRP_T_LOGOUT:
839 /* XXX Handle target logout */
840 printk(KERN_WARNING PFX "Got target logout request\n");
841 break;
842
843 default:
844 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
845 break;
846 }
847
848 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
849 DMA_FROM_DEVICE);
850 }
851
852 static void srp_completion(struct ib_cq *cq, void *target_ptr)
853 {
854 struct srp_target_port *target = target_ptr;
855 struct ib_wc wc;
856
857 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
858 while (ib_poll_cq(cq, 1, &wc) > 0) {
859 if (wc.status) {
860 printk(KERN_ERR PFX "failed %s status %d\n",
861 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
862 wc.status);
863 target->qp_in_error = 1;
864 break;
865 }
866
867 if (wc.wr_id & SRP_OP_RECV)
868 srp_handle_recv(target, &wc);
869 else
870 ++target->tx_tail;
871 }
872 }
873
874 static int __srp_post_recv(struct srp_target_port *target)
875 {
876 struct srp_iu *iu;
877 struct ib_sge list;
878 struct ib_recv_wr wr, *bad_wr;
879 unsigned int next;
880 int ret;
881
882 next = target->rx_head & (SRP_RQ_SIZE - 1);
883 wr.wr_id = next | SRP_OP_RECV;
884 iu = target->rx_ring[next];
885
886 list.addr = iu->dma;
887 list.length = iu->size;
888 list.lkey = target->srp_host->dev->mr->lkey;
889
890 wr.next = NULL;
891 wr.sg_list = &list;
892 wr.num_sge = 1;
893
894 ret = ib_post_recv(target->qp, &wr, &bad_wr);
895 if (!ret)
896 ++target->rx_head;
897
898 return ret;
899 }
900
901 static int srp_post_recv(struct srp_target_port *target)
902 {
903 unsigned long flags;
904 int ret;
905
906 spin_lock_irqsave(target->scsi_host->host_lock, flags);
907 ret = __srp_post_recv(target);
908 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
909
910 return ret;
911 }
912
913 /*
914 * Must be called with target->scsi_host->host_lock held to protect
915 * req_lim and tx_head. Lock cannot be dropped between call here and
916 * call to __srp_post_send().
917 */
918 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
919 {
920 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
921 return NULL;
922
923 if (unlikely(target->req_lim < 1))
924 ++target->zero_req_lim;
925
926 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
927 }
928
929 /*
930 * Must be called with target->scsi_host->host_lock held to protect
931 * req_lim and tx_head.
932 */
933 static int __srp_post_send(struct srp_target_port *target,
934 struct srp_iu *iu, int len)
935 {
936 struct ib_sge list;
937 struct ib_send_wr wr, *bad_wr;
938 int ret = 0;
939
940 list.addr = iu->dma;
941 list.length = len;
942 list.lkey = target->srp_host->dev->mr->lkey;
943
944 wr.next = NULL;
945 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
946 wr.sg_list = &list;
947 wr.num_sge = 1;
948 wr.opcode = IB_WR_SEND;
949 wr.send_flags = IB_SEND_SIGNALED;
950
951 ret = ib_post_send(target->qp, &wr, &bad_wr);
952
953 if (!ret) {
954 ++target->tx_head;
955 --target->req_lim;
956 }
957
958 return ret;
959 }
960
961 static int srp_queuecommand(struct scsi_cmnd *scmnd,
962 void (*done)(struct scsi_cmnd *))
963 {
964 struct srp_target_port *target = host_to_target(scmnd->device->host);
965 struct srp_request *req;
966 struct srp_iu *iu;
967 struct srp_cmd *cmd;
968 struct ib_device *dev;
969 int len;
970
971 if (target->state == SRP_TARGET_CONNECTING)
972 goto err;
973
974 if (target->state == SRP_TARGET_DEAD ||
975 target->state == SRP_TARGET_REMOVED) {
976 scmnd->result = DID_BAD_TARGET << 16;
977 done(scmnd);
978 return 0;
979 }
980
981 iu = __srp_get_tx_iu(target);
982 if (!iu)
983 goto err;
984
985 dev = target->srp_host->dev->dev;
986 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
987 DMA_TO_DEVICE);
988
989 req = list_entry(target->free_reqs.next, struct srp_request, list);
990
991 scmnd->scsi_done = done;
992 scmnd->result = 0;
993 scmnd->host_scribble = (void *) (long) req->index;
994
995 cmd = iu->buf;
996 memset(cmd, 0, sizeof *cmd);
997
998 cmd->opcode = SRP_CMD;
999 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1000 cmd->tag = req->index;
1001 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1002
1003 req->scmnd = scmnd;
1004 req->cmd = iu;
1005 req->cmd_done = 0;
1006 req->tsk_mgmt = NULL;
1007
1008 len = srp_map_data(scmnd, target, req);
1009 if (len < 0) {
1010 printk(KERN_ERR PFX "Failed to map data\n");
1011 goto err;
1012 }
1013
1014 if (__srp_post_recv(target)) {
1015 printk(KERN_ERR PFX "Recv failed\n");
1016 goto err_unmap;
1017 }
1018
1019 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1020 DMA_TO_DEVICE);
1021
1022 if (__srp_post_send(target, iu, len)) {
1023 printk(KERN_ERR PFX "Send failed\n");
1024 goto err_unmap;
1025 }
1026
1027 list_move_tail(&req->list, &target->req_queue);
1028
1029 return 0;
1030
1031 err_unmap:
1032 srp_unmap_data(scmnd, target, req);
1033
1034 err:
1035 return SCSI_MLQUEUE_HOST_BUSY;
1036 }
1037
1038 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1039 {
1040 int i;
1041
1042 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1043 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1044 target->max_ti_iu_len,
1045 GFP_KERNEL, DMA_FROM_DEVICE);
1046 if (!target->rx_ring[i])
1047 goto err;
1048 }
1049
1050 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1051 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1052 srp_max_iu_len,
1053 GFP_KERNEL, DMA_TO_DEVICE);
1054 if (!target->tx_ring[i])
1055 goto err;
1056 }
1057
1058 return 0;
1059
1060 err:
1061 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1062 srp_free_iu(target->srp_host, target->rx_ring[i]);
1063 target->rx_ring[i] = NULL;
1064 }
1065
1066 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1067 srp_free_iu(target->srp_host, target->tx_ring[i]);
1068 target->tx_ring[i] = NULL;
1069 }
1070
1071 return -ENOMEM;
1072 }
1073
1074 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1075 struct ib_cm_event *event,
1076 struct srp_target_port *target)
1077 {
1078 struct ib_class_port_info *cpi;
1079 int opcode;
1080
1081 switch (event->param.rej_rcvd.reason) {
1082 case IB_CM_REJ_PORT_CM_REDIRECT:
1083 cpi = event->param.rej_rcvd.ari;
1084 target->path.dlid = cpi->redirect_lid;
1085 target->path.pkey = cpi->redirect_pkey;
1086 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1087 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1088
1089 target->status = target->path.dlid ?
1090 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1091 break;
1092
1093 case IB_CM_REJ_PORT_REDIRECT:
1094 if (topspin_workarounds &&
1095 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1096 /*
1097 * Topspin/Cisco SRP gateways incorrectly send
1098 * reject reason code 25 when they mean 24
1099 * (port redirect).
1100 */
1101 memcpy(target->path.dgid.raw,
1102 event->param.rej_rcvd.ari, 16);
1103
1104 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1105 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1106 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1107
1108 target->status = SRP_PORT_REDIRECT;
1109 } else {
1110 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1111 target->status = -ECONNRESET;
1112 }
1113 break;
1114
1115 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1116 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1117 target->status = -ECONNRESET;
1118 break;
1119
1120 case IB_CM_REJ_CONSUMER_DEFINED:
1121 opcode = *(u8 *) event->private_data;
1122 if (opcode == SRP_LOGIN_REJ) {
1123 struct srp_login_rej *rej = event->private_data;
1124 u32 reason = be32_to_cpu(rej->reason);
1125
1126 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1127 printk(KERN_WARNING PFX
1128 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1129 else
1130 printk(KERN_WARNING PFX
1131 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1132 } else
1133 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1134 " opcode 0x%02x\n", opcode);
1135 target->status = -ECONNRESET;
1136 break;
1137
1138 default:
1139 printk(KERN_WARNING " REJ reason 0x%x\n",
1140 event->param.rej_rcvd.reason);
1141 target->status = -ECONNRESET;
1142 }
1143 }
1144
1145 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1146 {
1147 struct srp_target_port *target = cm_id->context;
1148 struct ib_qp_attr *qp_attr = NULL;
1149 int attr_mask = 0;
1150 int comp = 0;
1151 int opcode = 0;
1152
1153 switch (event->event) {
1154 case IB_CM_REQ_ERROR:
1155 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1156 comp = 1;
1157 target->status = -ECONNRESET;
1158 break;
1159
1160 case IB_CM_REP_RECEIVED:
1161 comp = 1;
1162 opcode = *(u8 *) event->private_data;
1163
1164 if (opcode == SRP_LOGIN_RSP) {
1165 struct srp_login_rsp *rsp = event->private_data;
1166
1167 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1168 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1169
1170 target->scsi_host->can_queue = min(target->req_lim,
1171 target->scsi_host->can_queue);
1172 } else {
1173 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1174 target->status = -ECONNRESET;
1175 break;
1176 }
1177
1178 if (!target->rx_ring[0]) {
1179 target->status = srp_alloc_iu_bufs(target);
1180 if (target->status)
1181 break;
1182 }
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 (target->qp_in_error)
1324 return FAILED;
1325 if (srp_find_req(target, scmnd, &req))
1326 return FAILED;
1327 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1328 return FAILED;
1329
1330 spin_lock_irq(target->scsi_host->host_lock);
1331
1332 if (req->cmd_done) {
1333 srp_remove_req(target, req);
1334 scmnd->scsi_done(scmnd);
1335 } else if (!req->tsk_status) {
1336 srp_remove_req(target, req);
1337 scmnd->result = DID_ABORT << 16;
1338 } else
1339 ret = FAILED;
1340
1341 spin_unlock_irq(target->scsi_host->host_lock);
1342
1343 return ret;
1344 }
1345
1346 static int srp_reset_device(struct scsi_cmnd *scmnd)
1347 {
1348 struct srp_target_port *target = host_to_target(scmnd->device->host);
1349 struct srp_request *req, *tmp;
1350
1351 printk(KERN_ERR "SRP reset_device called\n");
1352
1353 if (target->qp_in_error)
1354 return FAILED;
1355 if (srp_find_req(target, scmnd, &req))
1356 return FAILED;
1357 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1358 return FAILED;
1359 if (req->tsk_status)
1360 return FAILED;
1361
1362 spin_lock_irq(target->scsi_host->host_lock);
1363
1364 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1365 if (req->scmnd->device == scmnd->device)
1366 srp_reset_req(target, req);
1367
1368 spin_unlock_irq(target->scsi_host->host_lock);
1369
1370 return SUCCESS;
1371 }
1372
1373 static int srp_reset_host(struct scsi_cmnd *scmnd)
1374 {
1375 struct srp_target_port *target = host_to_target(scmnd->device->host);
1376 int ret = FAILED;
1377
1378 printk(KERN_ERR PFX "SRP reset_host called\n");
1379
1380 if (!srp_reconnect_target(target))
1381 ret = SUCCESS;
1382
1383 return ret;
1384 }
1385
1386 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1387 {
1388 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1389
1390 if (target->state == SRP_TARGET_DEAD ||
1391 target->state == SRP_TARGET_REMOVED)
1392 return -ENODEV;
1393
1394 return sprintf(buf, "0x%016llx\n",
1395 (unsigned long long) be64_to_cpu(target->id_ext));
1396 }
1397
1398 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1399 {
1400 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1401
1402 if (target->state == SRP_TARGET_DEAD ||
1403 target->state == SRP_TARGET_REMOVED)
1404 return -ENODEV;
1405
1406 return sprintf(buf, "0x%016llx\n",
1407 (unsigned long long) be64_to_cpu(target->ioc_guid));
1408 }
1409
1410 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1411 {
1412 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1413
1414 if (target->state == SRP_TARGET_DEAD ||
1415 target->state == SRP_TARGET_REMOVED)
1416 return -ENODEV;
1417
1418 return sprintf(buf, "0x%016llx\n",
1419 (unsigned long long) be64_to_cpu(target->service_id));
1420 }
1421
1422 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1423 {
1424 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1425
1426 if (target->state == SRP_TARGET_DEAD ||
1427 target->state == SRP_TARGET_REMOVED)
1428 return -ENODEV;
1429
1430 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1431 }
1432
1433 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1434 {
1435 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1436
1437 if (target->state == SRP_TARGET_DEAD ||
1438 target->state == SRP_TARGET_REMOVED)
1439 return -ENODEV;
1440
1441 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1442 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1443 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1444 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1445 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1446 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1447 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1448 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1449 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1450 }
1451
1452 static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
1453 {
1454 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1455
1456 if (target->state == SRP_TARGET_DEAD ||
1457 target->state == SRP_TARGET_REMOVED)
1458 return -ENODEV;
1459
1460 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1461 be16_to_cpu(target->orig_dgid[0]),
1462 be16_to_cpu(target->orig_dgid[1]),
1463 be16_to_cpu(target->orig_dgid[2]),
1464 be16_to_cpu(target->orig_dgid[3]),
1465 be16_to_cpu(target->orig_dgid[4]),
1466 be16_to_cpu(target->orig_dgid[5]),
1467 be16_to_cpu(target->orig_dgid[6]),
1468 be16_to_cpu(target->orig_dgid[7]));
1469 }
1470
1471 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1472 {
1473 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1474
1475 if (target->state == SRP_TARGET_DEAD ||
1476 target->state == SRP_TARGET_REMOVED)
1477 return -ENODEV;
1478
1479 return sprintf(buf, "%d\n", target->zero_req_lim);
1480 }
1481
1482 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1483 {
1484 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1485
1486 return sprintf(buf, "%d\n", target->srp_host->port);
1487 }
1488
1489 static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1490 {
1491 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1492
1493 return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1494 }
1495
1496 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1497 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1498 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1499 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1500 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1501 static CLASS_DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1502 static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1503 static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1504 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1505
1506 static struct class_device_attribute *srp_host_attrs[] = {
1507 &class_device_attr_id_ext,
1508 &class_device_attr_ioc_guid,
1509 &class_device_attr_service_id,
1510 &class_device_attr_pkey,
1511 &class_device_attr_dgid,
1512 &class_device_attr_orig_dgid,
1513 &class_device_attr_zero_req_lim,
1514 &class_device_attr_local_ib_port,
1515 &class_device_attr_local_ib_device,
1516 NULL
1517 };
1518
1519 static struct scsi_host_template srp_template = {
1520 .module = THIS_MODULE,
1521 .name = "InfiniBand SRP initiator",
1522 .proc_name = DRV_NAME,
1523 .info = srp_target_info,
1524 .queuecommand = srp_queuecommand,
1525 .eh_abort_handler = srp_abort,
1526 .eh_device_reset_handler = srp_reset_device,
1527 .eh_host_reset_handler = srp_reset_host,
1528 .can_queue = SRP_SQ_SIZE,
1529 .this_id = -1,
1530 .cmd_per_lun = SRP_SQ_SIZE,
1531 .use_clustering = ENABLE_CLUSTERING,
1532 .shost_attrs = srp_host_attrs
1533 };
1534
1535 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1536 {
1537 struct srp_rport_identifiers ids;
1538 struct srp_rport *rport;
1539
1540 sprintf(target->target_name, "SRP.T10:%016llX",
1541 (unsigned long long) be64_to_cpu(target->id_ext));
1542
1543 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1544 return -ENODEV;
1545
1546 memcpy(ids.port_id, &target->id_ext, 8);
1547 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1548 ids.roles = SRP_RPORT_ROLE_TARGET;
1549 rport = srp_rport_add(target->scsi_host, &ids);
1550 if (IS_ERR(rport)) {
1551 scsi_remove_host(target->scsi_host);
1552 return PTR_ERR(rport);
1553 }
1554
1555 spin_lock(&host->target_lock);
1556 list_add_tail(&target->list, &host->target_list);
1557 spin_unlock(&host->target_lock);
1558
1559 target->state = SRP_TARGET_LIVE;
1560
1561 scsi_scan_target(&target->scsi_host->shost_gendev,
1562 0, target->scsi_id, SCAN_WILD_CARD, 0);
1563
1564 return 0;
1565 }
1566
1567 static void srp_release_class_dev(struct class_device *class_dev)
1568 {
1569 struct srp_host *host =
1570 container_of(class_dev, struct srp_host, class_dev);
1571
1572 complete(&host->released);
1573 }
1574
1575 static struct class srp_class = {
1576 .name = "infiniband_srp",
1577 .release = srp_release_class_dev
1578 };
1579
1580 /*
1581 * Target ports are added by writing
1582 *
1583 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1584 * pkey=<P_Key>,service_id=<service ID>
1585 *
1586 * to the add_target sysfs attribute.
1587 */
1588 enum {
1589 SRP_OPT_ERR = 0,
1590 SRP_OPT_ID_EXT = 1 << 0,
1591 SRP_OPT_IOC_GUID = 1 << 1,
1592 SRP_OPT_DGID = 1 << 2,
1593 SRP_OPT_PKEY = 1 << 3,
1594 SRP_OPT_SERVICE_ID = 1 << 4,
1595 SRP_OPT_MAX_SECT = 1 << 5,
1596 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1597 SRP_OPT_IO_CLASS = 1 << 7,
1598 SRP_OPT_INITIATOR_EXT = 1 << 8,
1599 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1600 SRP_OPT_IOC_GUID |
1601 SRP_OPT_DGID |
1602 SRP_OPT_PKEY |
1603 SRP_OPT_SERVICE_ID),
1604 };
1605
1606 static match_table_t srp_opt_tokens = {
1607 { SRP_OPT_ID_EXT, "id_ext=%s" },
1608 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1609 { SRP_OPT_DGID, "dgid=%s" },
1610 { SRP_OPT_PKEY, "pkey=%x" },
1611 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1612 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1613 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1614 { SRP_OPT_IO_CLASS, "io_class=%x" },
1615 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1616 { SRP_OPT_ERR, NULL }
1617 };
1618
1619 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1620 {
1621 char *options, *sep_opt;
1622 char *p;
1623 char dgid[3];
1624 substring_t args[MAX_OPT_ARGS];
1625 int opt_mask = 0;
1626 int token;
1627 int ret = -EINVAL;
1628 int i;
1629
1630 options = kstrdup(buf, GFP_KERNEL);
1631 if (!options)
1632 return -ENOMEM;
1633
1634 sep_opt = options;
1635 while ((p = strsep(&sep_opt, ",")) != NULL) {
1636 if (!*p)
1637 continue;
1638
1639 token = match_token(p, srp_opt_tokens, args);
1640 opt_mask |= token;
1641
1642 switch (token) {
1643 case SRP_OPT_ID_EXT:
1644 p = match_strdup(args);
1645 if (!p) {
1646 ret = -ENOMEM;
1647 goto out;
1648 }
1649 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1650 kfree(p);
1651 break;
1652
1653 case SRP_OPT_IOC_GUID:
1654 p = match_strdup(args);
1655 if (!p) {
1656 ret = -ENOMEM;
1657 goto out;
1658 }
1659 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1660 kfree(p);
1661 break;
1662
1663 case SRP_OPT_DGID:
1664 p = match_strdup(args);
1665 if (!p) {
1666 ret = -ENOMEM;
1667 goto out;
1668 }
1669 if (strlen(p) != 32) {
1670 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1671 kfree(p);
1672 goto out;
1673 }
1674
1675 for (i = 0; i < 16; ++i) {
1676 strlcpy(dgid, p + i * 2, 3);
1677 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1678 }
1679 kfree(p);
1680 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1681 break;
1682
1683 case SRP_OPT_PKEY:
1684 if (match_hex(args, &token)) {
1685 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1686 goto out;
1687 }
1688 target->path.pkey = cpu_to_be16(token);
1689 break;
1690
1691 case SRP_OPT_SERVICE_ID:
1692 p = match_strdup(args);
1693 if (!p) {
1694 ret = -ENOMEM;
1695 goto out;
1696 }
1697 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1698 kfree(p);
1699 break;
1700
1701 case SRP_OPT_MAX_SECT:
1702 if (match_int(args, &token)) {
1703 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1704 goto out;
1705 }
1706 target->scsi_host->max_sectors = token;
1707 break;
1708
1709 case SRP_OPT_MAX_CMD_PER_LUN:
1710 if (match_int(args, &token)) {
1711 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1712 goto out;
1713 }
1714 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1715 break;
1716
1717 case SRP_OPT_IO_CLASS:
1718 if (match_hex(args, &token)) {
1719 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1720 goto out;
1721 }
1722 if (token != SRP_REV10_IB_IO_CLASS &&
1723 token != SRP_REV16A_IB_IO_CLASS) {
1724 printk(KERN_WARNING PFX "unknown IO class parameter value"
1725 " %x specified (use %x or %x).\n",
1726 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1727 goto out;
1728 }
1729 target->io_class = token;
1730 break;
1731
1732 case SRP_OPT_INITIATOR_EXT:
1733 p = match_strdup(args);
1734 if (!p) {
1735 ret = -ENOMEM;
1736 goto out;
1737 }
1738 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1739 kfree(p);
1740 break;
1741
1742 default:
1743 printk(KERN_WARNING PFX "unknown parameter or missing value "
1744 "'%s' in target creation request\n", p);
1745 goto out;
1746 }
1747 }
1748
1749 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1750 ret = 0;
1751 else
1752 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1753 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1754 !(srp_opt_tokens[i].token & opt_mask))
1755 printk(KERN_WARNING PFX "target creation request is "
1756 "missing parameter '%s'\n",
1757 srp_opt_tokens[i].pattern);
1758
1759 out:
1760 kfree(options);
1761 return ret;
1762 }
1763
1764 static ssize_t srp_create_target(struct class_device *class_dev,
1765 const char *buf, size_t count)
1766 {
1767 struct srp_host *host =
1768 container_of(class_dev, struct srp_host, class_dev);
1769 struct Scsi_Host *target_host;
1770 struct srp_target_port *target;
1771 int ret;
1772 int i;
1773
1774 target_host = scsi_host_alloc(&srp_template,
1775 sizeof (struct srp_target_port));
1776 if (!target_host)
1777 return -ENOMEM;
1778
1779 target_host->transportt = ib_srp_transport_template;
1780 target_host->max_lun = SRP_MAX_LUN;
1781 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1782
1783 target = host_to_target(target_host);
1784
1785 target->io_class = SRP_REV16A_IB_IO_CLASS;
1786 target->scsi_host = target_host;
1787 target->srp_host = host;
1788
1789 INIT_LIST_HEAD(&target->free_reqs);
1790 INIT_LIST_HEAD(&target->req_queue);
1791 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1792 target->req_ring[i].index = i;
1793 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1794 }
1795
1796 ret = srp_parse_options(buf, target);
1797 if (ret)
1798 goto err;
1799
1800 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1801
1802 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1803 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1804 (unsigned long long) be64_to_cpu(target->id_ext),
1805 (unsigned long long) be64_to_cpu(target->ioc_guid),
1806 be16_to_cpu(target->path.pkey),
1807 (unsigned long long) be64_to_cpu(target->service_id),
1808 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1809 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1810 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1811 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1812 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1813 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1814 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1815 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1816
1817 ret = srp_create_target_ib(target);
1818 if (ret)
1819 goto err;
1820
1821 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1822 if (IS_ERR(target->cm_id)) {
1823 ret = PTR_ERR(target->cm_id);
1824 goto err_free;
1825 }
1826
1827 target->qp_in_error = 0;
1828 ret = srp_connect_target(target);
1829 if (ret) {
1830 printk(KERN_ERR PFX "Connection failed\n");
1831 goto err_cm_id;
1832 }
1833
1834 ret = srp_add_target(host, target);
1835 if (ret)
1836 goto err_disconnect;
1837
1838 return count;
1839
1840 err_disconnect:
1841 srp_disconnect_target(target);
1842
1843 err_cm_id:
1844 ib_destroy_cm_id(target->cm_id);
1845
1846 err_free:
1847 srp_free_target_ib(target);
1848
1849 err:
1850 scsi_host_put(target_host);
1851
1852 return ret;
1853 }
1854
1855 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1856
1857 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1858 {
1859 struct srp_host *host =
1860 container_of(class_dev, struct srp_host, class_dev);
1861
1862 return sprintf(buf, "%s\n", host->dev->dev->name);
1863 }
1864
1865 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1866
1867 static ssize_t show_port(struct class_device *class_dev, char *buf)
1868 {
1869 struct srp_host *host =
1870 container_of(class_dev, struct srp_host, class_dev);
1871
1872 return sprintf(buf, "%d\n", host->port);
1873 }
1874
1875 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1876
1877 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1878 {
1879 struct srp_host *host;
1880
1881 host = kzalloc(sizeof *host, GFP_KERNEL);
1882 if (!host)
1883 return NULL;
1884
1885 INIT_LIST_HEAD(&host->target_list);
1886 spin_lock_init(&host->target_lock);
1887 init_completion(&host->released);
1888 host->dev = device;
1889 host->port = port;
1890
1891 host->class_dev.class = &srp_class;
1892 host->class_dev.dev = device->dev->dma_device;
1893 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1894 device->dev->name, port);
1895
1896 if (class_device_register(&host->class_dev))
1897 goto free_host;
1898 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1899 goto err_class;
1900 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1901 goto err_class;
1902 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1903 goto err_class;
1904
1905 return host;
1906
1907 err_class:
1908 class_device_unregister(&host->class_dev);
1909
1910 free_host:
1911 kfree(host);
1912
1913 return NULL;
1914 }
1915
1916 static void srp_add_one(struct ib_device *device)
1917 {
1918 struct srp_device *srp_dev;
1919 struct ib_device_attr *dev_attr;
1920 struct ib_fmr_pool_param fmr_param;
1921 struct srp_host *host;
1922 int s, e, p;
1923
1924 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1925 if (!dev_attr)
1926 return;
1927
1928 if (ib_query_device(device, dev_attr)) {
1929 printk(KERN_WARNING PFX "Query device failed for %s\n",
1930 device->name);
1931 goto free_attr;
1932 }
1933
1934 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1935 if (!srp_dev)
1936 goto free_attr;
1937
1938 /*
1939 * Use the smallest page size supported by the HCA, down to a
1940 * minimum of 512 bytes (which is the smallest sector that a
1941 * SCSI command will ever carry).
1942 */
1943 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1944 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
1945 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
1946
1947 INIT_LIST_HEAD(&srp_dev->dev_list);
1948
1949 srp_dev->dev = device;
1950 srp_dev->pd = ib_alloc_pd(device);
1951 if (IS_ERR(srp_dev->pd))
1952 goto free_dev;
1953
1954 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1955 IB_ACCESS_LOCAL_WRITE |
1956 IB_ACCESS_REMOTE_READ |
1957 IB_ACCESS_REMOTE_WRITE);
1958 if (IS_ERR(srp_dev->mr))
1959 goto err_pd;
1960
1961 memset(&fmr_param, 0, sizeof fmr_param);
1962 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
1963 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
1964 fmr_param.cache = 1;
1965 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1966 fmr_param.page_shift = srp_dev->fmr_page_shift;
1967 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
1968 IB_ACCESS_REMOTE_WRITE |
1969 IB_ACCESS_REMOTE_READ);
1970
1971 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1972 if (IS_ERR(srp_dev->fmr_pool))
1973 srp_dev->fmr_pool = NULL;
1974
1975 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1976 s = 0;
1977 e = 0;
1978 } else {
1979 s = 1;
1980 e = device->phys_port_cnt;
1981 }
1982
1983 for (p = s; p <= e; ++p) {
1984 host = srp_add_port(srp_dev, p);
1985 if (host)
1986 list_add_tail(&host->list, &srp_dev->dev_list);
1987 }
1988
1989 ib_set_client_data(device, &srp_client, srp_dev);
1990
1991 goto free_attr;
1992
1993 err_pd:
1994 ib_dealloc_pd(srp_dev->pd);
1995
1996 free_dev:
1997 kfree(srp_dev);
1998
1999 free_attr:
2000 kfree(dev_attr);
2001 }
2002
2003 static void srp_remove_one(struct ib_device *device)
2004 {
2005 struct srp_device *srp_dev;
2006 struct srp_host *host, *tmp_host;
2007 LIST_HEAD(target_list);
2008 struct srp_target_port *target, *tmp_target;
2009
2010 srp_dev = ib_get_client_data(device, &srp_client);
2011
2012 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2013 class_device_unregister(&host->class_dev);
2014 /*
2015 * Wait for the sysfs entry to go away, so that no new
2016 * target ports can be created.
2017 */
2018 wait_for_completion(&host->released);
2019
2020 /*
2021 * Mark all target ports as removed, so we stop queueing
2022 * commands and don't try to reconnect.
2023 */
2024 spin_lock(&host->target_lock);
2025 list_for_each_entry(target, &host->target_list, list) {
2026 spin_lock_irq(target->scsi_host->host_lock);
2027 target->state = SRP_TARGET_REMOVED;
2028 spin_unlock_irq(target->scsi_host->host_lock);
2029 }
2030 spin_unlock(&host->target_lock);
2031
2032 /*
2033 * Wait for any reconnection tasks that may have
2034 * started before we marked our target ports as
2035 * removed, and any target port removal tasks.
2036 */
2037 flush_scheduled_work();
2038
2039 list_for_each_entry_safe(target, tmp_target,
2040 &host->target_list, list) {
2041 scsi_remove_host(target->scsi_host);
2042 srp_disconnect_target(target);
2043 ib_destroy_cm_id(target->cm_id);
2044 srp_free_target_ib(target);
2045 scsi_host_put(target->scsi_host);
2046 }
2047
2048 kfree(host);
2049 }
2050
2051 if (srp_dev->fmr_pool)
2052 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2053 ib_dereg_mr(srp_dev->mr);
2054 ib_dealloc_pd(srp_dev->pd);
2055
2056 kfree(srp_dev);
2057 }
2058
2059 static struct srp_function_template ib_srp_transport_functions = {
2060 };
2061
2062 static int __init srp_init_module(void)
2063 {
2064 int ret;
2065
2066 ib_srp_transport_template =
2067 srp_attach_transport(&ib_srp_transport_functions);
2068 if (!ib_srp_transport_template)
2069 return -ENOMEM;
2070
2071 srp_template.sg_tablesize = srp_sg_tablesize;
2072 srp_max_iu_len = (sizeof (struct srp_cmd) +
2073 sizeof (struct srp_indirect_buf) +
2074 srp_sg_tablesize * 16);
2075
2076 ret = class_register(&srp_class);
2077 if (ret) {
2078 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2079 srp_release_transport(ib_srp_transport_template);
2080 return ret;
2081 }
2082
2083 ib_sa_register_client(&srp_sa_client);
2084
2085 ret = ib_register_client(&srp_client);
2086 if (ret) {
2087 printk(KERN_ERR PFX "couldn't register IB client\n");
2088 srp_release_transport(ib_srp_transport_template);
2089 ib_sa_unregister_client(&srp_sa_client);
2090 class_unregister(&srp_class);
2091 return ret;
2092 }
2093
2094 return 0;
2095 }
2096
2097 static void __exit srp_cleanup_module(void)
2098 {
2099 ib_unregister_client(&srp_client);
2100 ib_sa_unregister_client(&srp_sa_client);
2101 class_unregister(&srp_class);
2102 srp_release_transport(ib_srp_transport_template);
2103 }
2104
2105 module_init(srp_init_module);
2106 module_exit(srp_cleanup_module);
WRT350N Kernel Patches