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IB/srp: Fix crash in srp_reconnect_target
[deliverable/linux.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 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
aef9ec39
RD		 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>
de25968c 42#include <linux/jiffies.h>
aef9ec39
RD		 43
44#include <asm/atomic.h>
45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/srp.h>
50
51#include <rdma/ib_cache.h>
52
53#include "ib_srp.h"
54
55#define DRV_NAME "ib_srp"
56#define PFX DRV_NAME ": "
57#define DRV_VERSION "0.2"
58#define DRV_RELDATE "November 1, 2005"
59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
74b0a15b
VP		 65static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
66static int srp_max_iu_len;
67
68module_param(srp_sg_tablesize, int, 0444);
69MODULE_PARM_DESC(srp_sg_tablesize,
70 "Max number of gather/scatter entries per I/O (default is 12)");
71
aef9ec39
RD		 72static int topspin_workarounds = 1;
73
74module_param(topspin_workarounds, int, 0444);
75MODULE_PARM_DESC(topspin_workarounds,
76 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
77
78static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
79
80static void srp_add_one(struct ib_device *device);
81static void srp_remove_one(struct ib_device *device);
82static void srp_completion(struct ib_cq *cq, void *target_ptr);
83static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
84
85static struct ib_client srp_client = {
86 .name = "srp",
87 .add = srp_add_one,
88 .remove = srp_remove_one
89};
90
91static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
92{
93 return (struct srp_target_port *) host->hostdata;
94}
95
96static const char *srp_target_info(struct Scsi_Host *host)
97{
98 return host_to_target(host)->target_name;
99}
100
101static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
102 gfp_t gfp_mask,
103 enum dma_data_direction direction)
104{
105 struct srp_iu *iu;
106
107 iu = kmalloc(sizeof *iu, gfp_mask);
108 if (!iu)
109 goto out;
110
111 iu->buf = kzalloc(size, gfp_mask);
112 if (!iu->buf)
113 goto out_free_iu;
114
f5358a17
RD		 115 iu->dma = dma_map_single(host->dev->dev->dma_device,
116 iu->buf, size, direction);
aef9ec39
RD		 117 if (dma_mapping_error(iu->dma))
118 goto out_free_buf;
119
120 iu->size = size;
121 iu->direction = direction;
122
123 return iu;
124
125out_free_buf:
126 kfree(iu->buf);
127out_free_iu:
128 kfree(iu);
129out:
130 return NULL;
131}
132
133static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
134{
135 if (!iu)
136 return;
137
f5358a17
RD		 138 dma_unmap_single(host->dev->dev->dma_device,
139 iu->dma, iu->size, iu->direction);
aef9ec39
RD		 140 kfree(iu->buf);
141 kfree(iu);
142}
143
144static void srp_qp_event(struct ib_event *event, void *context)
145{
146 printk(KERN_ERR PFX "QP event %d\n", event->event);
147}
148
149static int srp_init_qp(struct srp_target_port *target,
150 struct ib_qp *qp)
151{
152 struct ib_qp_attr *attr;
153 int ret;
154
155 attr = kmalloc(sizeof *attr, GFP_KERNEL);
156 if (!attr)
157 return -ENOMEM;
158
f5358a17 159 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
aef9ec39
RD		 160 target->srp_host->port,
161 be16_to_cpu(target->path.pkey),
162 &attr->pkey_index);
163 if (ret)
164 goto out;
165
166 attr->qp_state = IB_QPS_INIT;
167 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
168 IB_ACCESS_REMOTE_WRITE);
169 attr->port_num = target->srp_host->port;
170
171 ret = ib_modify_qp(qp, attr,
172 IB_QP_STATE |
173 IB_QP_PKEY_INDEX |
174 IB_QP_ACCESS_FLAGS |
175 IB_QP_PORT);
176
177out:
178 kfree(attr);
179 return ret;
180}
181
182static int srp_create_target_ib(struct srp_target_port *target)
183{
184 struct ib_qp_init_attr *init_attr;
185 int ret;
186
187 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
188 if (!init_attr)
189 return -ENOMEM;
190
f5358a17 191 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
aef9ec39
RD		 192 NULL, target, SRP_CQ_SIZE);
193 if (IS_ERR(target->cq)) {
194 ret = PTR_ERR(target->cq);
195 goto out;
196 }
197
198 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
199
200 init_attr->event_handler = srp_qp_event;
201 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
202 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
203 init_attr->cap.max_recv_sge = 1;
204 init_attr->cap.max_send_sge = 1;
205 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
206 init_attr->qp_type = IB_QPT_RC;
207 init_attr->send_cq = target->cq;
208 init_attr->recv_cq = target->cq;
209
f5358a17 210 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
aef9ec39
RD		 211 if (IS_ERR(target->qp)) {
212 ret = PTR_ERR(target->qp);
213 ib_destroy_cq(target->cq);
214 goto out;
215 }
216
217 ret = srp_init_qp(target, target->qp);
218 if (ret) {
219 ib_destroy_qp(target->qp);
220 ib_destroy_cq(target->cq);
221 goto out;
222 }
223
224out:
225 kfree(init_attr);
226 return ret;
227}
228
229static void srp_free_target_ib(struct srp_target_port *target)
230{
231 int i;
232
233 ib_destroy_qp(target->qp);
234 ib_destroy_cq(target->cq);
235
236 for (i = 0; i < SRP_RQ_SIZE; ++i)
237 srp_free_iu(target->srp_host, target->rx_ring[i]);
238 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
239 srp_free_iu(target->srp_host, target->tx_ring[i]);
240}
241
242static void srp_path_rec_completion(int status,
243 struct ib_sa_path_rec *pathrec,
244 void *target_ptr)
245{
246 struct srp_target_port *target = target_ptr;
247
248 target->status = status;
249 if (status)
250 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
251 else
252 target->path = *pathrec;
253 complete(&target->done);
254}
255
256static int srp_lookup_path(struct srp_target_port *target)
257{
258 target->path.numb_path = 1;
259
260 init_completion(&target->done);
261
f5358a17 262 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev->dev,
aef9ec39
RD		 263 target->srp_host->port,
264 &target->path,
265 IB_SA_PATH_REC_DGID |
266 IB_SA_PATH_REC_SGID |
267 IB_SA_PATH_REC_NUMB_PATH |
268 IB_SA_PATH_REC_PKEY,
269 SRP_PATH_REC_TIMEOUT_MS,
270 GFP_KERNEL,
271 srp_path_rec_completion,
272 target, &target->path_query);
273 if (target->path_query_id < 0)
274 return target->path_query_id;
275
276 wait_for_completion(&target->done);
277
278 if (target->status < 0)
279 printk(KERN_WARNING PFX "Path record query failed\n");
280
281 return target->status;
282}
283
284static int srp_send_req(struct srp_target_port *target)
285{
286 struct {
287 struct ib_cm_req_param param;
288 struct srp_login_req priv;
289 } *req = NULL;
290 int status;
291
292 req = kzalloc(sizeof *req, GFP_KERNEL);
293 if (!req)
294 return -ENOMEM;
295
296 req->param.primary_path = &target->path;
297 req->param.alternate_path = NULL;
298 req->param.service_id = target->service_id;
299 req->param.qp_num = target->qp->qp_num;
300 req->param.qp_type = target->qp->qp_type;
301 req->param.private_data = &req->priv;
302 req->param.private_data_len = sizeof req->priv;
303 req->param.flow_control = 1;
304
305 get_random_bytes(&req->param.starting_psn, 4);
306 req->param.starting_psn &= 0xffffff;
307
308 /*
309 * Pick some arbitrary defaults here; we could make these
310 * module parameters if anyone cared about setting them.
311 */
312 req->param.responder_resources = 4;
313 req->param.remote_cm_response_timeout = 20;
314 req->param.local_cm_response_timeout = 20;
315 req->param.retry_count = 7;
316 req->param.rnr_retry_count = 7;
317 req->param.max_cm_retries = 15;
318
319 req->priv.opcode = SRP_LOGIN_REQ;
320 req->priv.tag = 0;
74b0a15b 321 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
aef9ec39
RD		 322 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
323 SRP_BUF_FORMAT_INDIRECT);
0c0450db
R		 324 /*
325 * In the published SRP specification (draft rev. 16a), the
326 * port identifier format is 8 bytes of ID extension followed
327 * by 8 bytes of GUID. Older drafts put the two halves in the
328 * opposite order, so that the GUID comes first.
329 *
330 * Targets conforming to these obsolete drafts can be
331 * recognized by the I/O Class they report.
332 */
333 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
334 memcpy(req->priv.initiator_port_id,
335 target->srp_host->initiator_port_id + 8, 8);
336 memcpy(req->priv.initiator_port_id + 8,
337 target->srp_host->initiator_port_id, 8);
338 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
339 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
340 } else {
341 memcpy(req->priv.initiator_port_id,
342 target->srp_host->initiator_port_id, 16);
343 memcpy(req->priv.target_port_id, &target->id_ext, 8);
344 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
345 }
346
aef9ec39
RD		 347 /*
348 * Topspin/Cisco SRP targets will reject our login unless we
349 * zero out the first 8 bytes of our initiator port ID. The
350 * second 8 bytes must be our local node GUID, but we always
351 * use that anyway.
352 */
353 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
354 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
355 "activated for target GUID %016llx\n",
356 (unsigned long long) be64_to_cpu(target->ioc_guid));
357 memset(req->priv.initiator_port_id, 0, 8);
358 }
aef9ec39
RD		 359
360 status = ib_send_cm_req(target->cm_id, &req->param);
361
362 kfree(req);
363
364 return status;
365}
366
367static void srp_disconnect_target(struct srp_target_port *target)
368{
369 /* XXX should send SRP_I_LOGOUT request */
370
371 init_completion(&target->done);
e6581056
RD		 372 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
373 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
374 return;
375 }
aef9ec39
RD		 376 wait_for_completion(&target->done);
377}
378
379static void srp_remove_work(void *target_ptr)
380{
381 struct srp_target_port *target = target_ptr;
382
383 spin_lock_irq(target->scsi_host->host_lock);
384 if (target->state != SRP_TARGET_DEAD) {
385 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 386 return;
387 }
388 target->state = SRP_TARGET_REMOVED;
389 spin_unlock_irq(target->scsi_host->host_lock);
390
b3589fd4 391 spin_lock(&target->srp_host->target_lock);
aef9ec39 392 list_del(&target->list);
b3589fd4 393 spin_unlock(&target->srp_host->target_lock);
aef9ec39
RD		 394
395 scsi_remove_host(target->scsi_host);
396 ib_destroy_cm_id(target->cm_id);
397 srp_free_target_ib(target);
398 scsi_host_put(target->scsi_host);
aef9ec39
RD		 399}
400
401static int srp_connect_target(struct srp_target_port *target)
402{
403 int ret;
404
405 ret = srp_lookup_path(target);
406 if (ret)
407 return ret;
408
409 while (1) {
410 init_completion(&target->done);
411 ret = srp_send_req(target);
412 if (ret)
413 return ret;
414 wait_for_completion(&target->done);
415
416 /*
417 * The CM event handling code will set status to
418 * SRP_PORT_REDIRECT if we get a port redirect REJ
419 * back, or SRP_DLID_REDIRECT if we get a lid/qp
420 * redirect REJ back.
421 */
422 switch (target->status) {
423 case 0:
424 return 0;
425
426 case SRP_PORT_REDIRECT:
427 ret = srp_lookup_path(target);
428 if (ret)
429 return ret;
430 break;
431
432 case SRP_DLID_REDIRECT:
433 break;
434
435 default:
436 return target->status;
437 }
438 }
439}
440
d945e1df
RD		 441static void srp_unmap_data(struct scsi_cmnd *scmnd,
442 struct srp_target_port *target,
443 struct srp_request *req)
444{
445 struct scatterlist *scat;
446 int nents;
447
448 if (!scmnd->request_buffer ||
449 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
450 scmnd->sc_data_direction != DMA_FROM_DEVICE))
451 return;
452
f5358a17
RD		 453 if (req->fmr) {
454 ib_fmr_pool_unmap(req->fmr);
455 req->fmr = NULL;
456 }
457
d945e1df
RD		 458 /*
459 * This handling of non-SG commands can be killed when the
460 * SCSI midlayer no longer generates non-SG commands.
461 */
462 if (likely(scmnd->use_sg)) {
463 nents = scmnd->use_sg;
464 scat = scmnd->request_buffer;
465 } else {
466 nents = 1;
467 scat = &req->fake_sg;
468 }
469
f5358a17 470 dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
d945e1df
RD		 471 scmnd->sc_data_direction);
472}
473
526b4caa
IR		 474static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
475{
476 srp_unmap_data(req->scmnd, target, req);
477 list_move_tail(&req->list, &target->free_reqs);
478}
479
480static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
481{
482 req->scmnd->result = DID_RESET << 16;
483 req->scmnd->scsi_done(req->scmnd);
484 srp_remove_req(target, req);
485}
486
aef9ec39
RD		 487static int srp_reconnect_target(struct srp_target_port *target)
488{
489 struct ib_cm_id *new_cm_id;
490 struct ib_qp_attr qp_attr;
526b4caa 491 struct srp_request *req, *tmp;
aef9ec39
RD		 492 struct ib_wc wc;
493 int ret;
aef9ec39
RD		 494
495 spin_lock_irq(target->scsi_host->host_lock);
496 if (target->state != SRP_TARGET_LIVE) {
497 spin_unlock_irq(target->scsi_host->host_lock);
498 return -EAGAIN;
499 }
500 target->state = SRP_TARGET_CONNECTING;
501 spin_unlock_irq(target->scsi_host->host_lock);
502
503 srp_disconnect_target(target);
504 /*
505 * Now get a new local CM ID so that we avoid confusing the
506 * target in case things are really fouled up.
507 */
f5358a17 508 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
aef9ec39
RD		 509 srp_cm_handler, target);
510 if (IS_ERR(new_cm_id)) {
511 ret = PTR_ERR(new_cm_id);
512 goto err;
513 }
514 ib_destroy_cm_id(target->cm_id);
515 target->cm_id = new_cm_id;
516
517 qp_attr.qp_state = IB_QPS_RESET;
518 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
519 if (ret)
520 goto err;
521
522 ret = srp_init_qp(target, target->qp);
523 if (ret)
524 goto err;
525
526 while (ib_poll_cq(target->cq, 1, &wc) > 0)
527 ; /* nothing */
528
d916a8f1 529 spin_lock_irq(target->scsi_host->host_lock);
526b4caa
IR		 530 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
531 srp_reset_req(target, req);
d916a8f1 532 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 533
534 target->rx_head = 0;
535 target->tx_head = 0;
536 target->tx_tail = 0;
aef9ec39
RD		 537
538 ret = srp_connect_target(target);
539 if (ret)
540 goto err;
541
542 spin_lock_irq(target->scsi_host->host_lock);
543 if (target->state == SRP_TARGET_CONNECTING) {
544 ret = 0;
545 target->state = SRP_TARGET_LIVE;
546 } else
547 ret = -EAGAIN;
548 spin_unlock_irq(target->scsi_host->host_lock);
549
550 return ret;
551
552err:
553 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
554
555 /*
556 * We couldn't reconnect, so kill our target port off.
557 * However, we have to defer the real removal because we might
558 * be in the context of the SCSI error handler now, which
559 * would deadlock if we call scsi_remove_host().
560 */
561 spin_lock_irq(target->scsi_host->host_lock);
562 if (target->state == SRP_TARGET_CONNECTING) {
563 target->state = SRP_TARGET_DEAD;
564 INIT_WORK(&target->work, srp_remove_work, target);
565 schedule_work(&target->work);
566 }
567 spin_unlock_irq(target->scsi_host->host_lock);
568
569 return ret;
570}
571
f5358a17
RD		 572static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat,
573 int sg_cnt, struct srp_request *req,
574 struct srp_direct_buf *buf)
575{
576 u64 io_addr = 0;
577 u64 *dma_pages;
578 u32 len;
579 int page_cnt;
580 int i, j;
581 int ret;
582
583 if (!dev->fmr_pool)
584 return -ENODEV;
585
586 len = page_cnt = 0;
587 for (i = 0; i < sg_cnt; ++i) {
588 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
589 if (i > 0)
590 return -EINVAL;
591 else
592 ++page_cnt;
593 }
594 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
595 ~dev->fmr_page_mask) {
596 if (i < sg_cnt - 1)
597 return -EINVAL;
598 else
599 ++page_cnt;
600 }
601
602 len += sg_dma_len(&scat[i]);
603 }
604
605 page_cnt += len >> dev->fmr_page_shift;
606 if (page_cnt > SRP_FMR_SIZE)
607 return -ENOMEM;
608
609 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
610 if (!dma_pages)
611 return -ENOMEM;
612
613 page_cnt = 0;
614 for (i = 0; i < sg_cnt; ++i)
615 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
616 dma_pages[page_cnt++] =
617 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
618
619 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
adfaa888 620 dma_pages, page_cnt, io_addr);
f5358a17
RD		 621 if (IS_ERR(req->fmr)) {
622 ret = PTR_ERR(req->fmr);
6583eb3d 623 req->fmr = NULL;
f5358a17
RD		 624 goto out;
625 }
626
627 buf->va = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
628 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
629 buf->len = cpu_to_be32(len);
630
631 ret = 0;
632
633out:
634 kfree(dma_pages);
635
636 return ret;
637}
638
aef9ec39
RD		 639static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
640 struct srp_request *req)
641{
cf368713 642 struct scatterlist *scat;
aef9ec39 643 struct srp_cmd *cmd = req->cmd->buf;
cf368713 644 int len, nents, count;
f5358a17 645 u8 fmt = SRP_DATA_DESC_DIRECT;
aef9ec39
RD		 646
647 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
648 return sizeof (struct srp_cmd);
649
650 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
651 scmnd->sc_data_direction != DMA_TO_DEVICE) {
652 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
653 scmnd->sc_data_direction);
654 return -EINVAL;
655 }
656
cf368713
RD		 657 /*
658 * This handling of non-SG commands can be killed when the
659 * SCSI midlayer no longer generates non-SG commands.
660 */
661 if (likely(scmnd->use_sg)) {
662 nents = scmnd->use_sg;
663 scat = scmnd->request_buffer;
664 } else {
665 nents = 1;
666 scat = &req->fake_sg;
667 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
668 }
aef9ec39 669
f5358a17
RD		 670 count = dma_map_sg(target->srp_host->dev->dev->dma_device,
671 scat, nents, scmnd->sc_data_direction);
672
673 fmt = SRP_DATA_DESC_DIRECT;
674 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 675
cf368713 676 if (count == 1) {
f5358a17
RD		 677 /*
678 * The midlayer only generated a single gather/scatter
679 * entry, or DMA mapping coalesced everything to a
680 * single entry. So a direct descriptor along with
681 * the DMA MR suffices.
682 */
cf368713 683 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 684
cf368713 685 buf->va = cpu_to_be64(sg_dma_address(scat));
f5358a17 686 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
cf368713 687 buf->len = cpu_to_be32(sg_dma_len(scat));
f5358a17
RD		 688 } else if (srp_map_fmr(target->srp_host->dev, scat, count, req,
689 (void *) cmd->add_data)) {
690 /*
691 * FMR mapping failed, and the scatterlist has more
692 * than one entry. Generate an indirect memory
693 * descriptor.
694 */
cf368713
RD		 695 struct srp_indirect_buf *buf = (void *) cmd->add_data;
696 u32 datalen = 0;
f5358a17 697 int i;
aef9ec39 698
cf368713 699 fmt = SRP_DATA_DESC_INDIRECT;
f5358a17
RD		 700 len = sizeof (struct srp_cmd) +
701 sizeof (struct srp_indirect_buf) +
702 count * sizeof (struct srp_direct_buf);
703
704 for (i = 0; i < count; ++i) {
705 buf->desc_list[i].va =
706 cpu_to_be64(sg_dma_address(&scat[i]));
707 buf->desc_list[i].key =
708 cpu_to_be32(target->srp_host->dev->mr->rkey);
709 buf->desc_list[i].len =
710 cpu_to_be32(sg_dma_len(&scat[i]));
711 datalen += sg_dma_len(&scat[i]);
712 }
aef9ec39 713
cf368713
RD		 714 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
715 cmd->data_out_desc_cnt = count;
716 else
717 cmd->data_in_desc_cnt = count;
718
f5358a17
RD		 719 buf->table_desc.va =
720 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
cf368713 721 buf->table_desc.key =
f5358a17 722 cpu_to_be32(target->srp_host->dev->mr->rkey);
cf368713
RD		 723 buf->table_desc.len =
724 cpu_to_be32(count * sizeof (struct srp_direct_buf));
725
cf368713 726 buf->len = cpu_to_be32(datalen);
aef9ec39
RD		 727 }
728
729 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
730 cmd->buf_fmt = fmt << 4;
731 else
732 cmd->buf_fmt = fmt;
733
aef9ec39
RD		 734 return len;
735}
736
aef9ec39
RD		 737static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
738{
739 struct srp_request *req;
740 struct scsi_cmnd *scmnd;
741 unsigned long flags;
742 s32 delta;
743
744 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
745
746 spin_lock_irqsave(target->scsi_host->host_lock, flags);
747
748 target->req_lim += delta;
749
750 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
751
752 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
753 if (be32_to_cpu(rsp->resp_data_len) < 4)
754 req->tsk_status = -1;
755 else
756 req->tsk_status = rsp->data[3];
757 complete(&req->done);
758 } else {
d945e1df 759 scmnd = req->scmnd;
aef9ec39
RD		 760 if (!scmnd)
761 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
762 (unsigned long long) rsp->tag);
763 scmnd->result = rsp->status;
764
765 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
766 memcpy(scmnd->sense_buffer, rsp->data +
767 be32_to_cpu(rsp->resp_data_len),
768 min_t(int, be32_to_cpu(rsp->sense_data_len),
769 SCSI_SENSE_BUFFERSIZE));
770 }
771
772 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
773 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
774 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
775 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
776
aef9ec39 777 if (!req->tsk_mgmt) {
aef9ec39
RD		 778 scmnd->host_scribble = (void *) -1L;
779 scmnd->scsi_done(scmnd);
780
d945e1df 781 srp_remove_req(target, req);
aef9ec39
RD		 782 } else
783 req->cmd_done = 1;
784 }
785
786 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
787}
788
789static void srp_reconnect_work(void *target_ptr)
790{
791 struct srp_target_port *target = target_ptr;
792
793 srp_reconnect_target(target);
794}
795
796static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
797{
798 struct srp_iu *iu;
799 u8 opcode;
800
801 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
802
f5358a17 803 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
aef9ec39
RD		 804 target->max_ti_iu_len, DMA_FROM_DEVICE);
805
806 opcode = *(u8 *) iu->buf;
807
808 if (0) {
809 int i;
810
811 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
812
813 for (i = 0; i < wc->byte_len; ++i) {
814 if (i % 8 == 0)
815 printk(KERN_ERR " [%02x] ", i);
816 printk(" %02x", ((u8 *) iu->buf)[i]);
817 if ((i + 1) % 8 == 0)
818 printk("\n");
819 }
820
821 if (wc->byte_len % 8)
822 printk("\n");
823 }
824
825 switch (opcode) {
826 case SRP_RSP:
827 srp_process_rsp(target, iu->buf);
828 break;
829
830 case SRP_T_LOGOUT:
831 /* XXX Handle target logout */
832 printk(KERN_WARNING PFX "Got target logout request\n");
833 break;
834
835 default:
836 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
837 break;
838 }
839
f5358a17 840 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
aef9ec39
RD		 841 target->max_ti_iu_len, DMA_FROM_DEVICE);
842}
843
844static void srp_completion(struct ib_cq *cq, void *target_ptr)
845{
846 struct srp_target_port *target = target_ptr;
847 struct ib_wc wc;
848 unsigned long flags;
849
850 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
851 while (ib_poll_cq(cq, 1, &wc) > 0) {
852 if (wc.status) {
853 printk(KERN_ERR PFX "failed %s status %d\n",
854 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
855 wc.status);
856 spin_lock_irqsave(target->scsi_host->host_lock, flags);
857 if (target->state == SRP_TARGET_LIVE)
858 schedule_work(&target->work);
859 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
860 break;
861 }
862
863 if (wc.wr_id & SRP_OP_RECV)
864 srp_handle_recv(target, &wc);
865 else
866 ++target->tx_tail;
867 }
868}
869
870static int __srp_post_recv(struct srp_target_port *target)
871{
872 struct srp_iu *iu;
873 struct ib_sge list;
874 struct ib_recv_wr wr, *bad_wr;
875 unsigned int next;
876 int ret;
877
878 next = target->rx_head & (SRP_RQ_SIZE - 1);
879 wr.wr_id = next | SRP_OP_RECV;
880 iu = target->rx_ring[next];
881
882 list.addr = iu->dma;
883 list.length = iu->size;
f5358a17 884 list.lkey = target->srp_host->dev->mr->lkey;
aef9ec39
RD		 885
886 wr.next = NULL;
887 wr.sg_list = &list;
888 wr.num_sge = 1;
889
890 ret = ib_post_recv(target->qp, &wr, &bad_wr);
891 if (!ret)
892 ++target->rx_head;
893
894 return ret;
895}
896
897static int srp_post_recv(struct srp_target_port *target)
898{
899 unsigned long flags;
900 int ret;
901
902 spin_lock_irqsave(target->scsi_host->host_lock, flags);
903 ret = __srp_post_recv(target);
904 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
905
906 return ret;
907}
908
909/*
910 * Must be called with target->scsi_host->host_lock held to protect
47f2bce9
RD		 911 * req_lim and tx_head. Lock cannot be dropped between call here and
912 * call to __srp_post_send().
aef9ec39
RD		 913 */
914static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
915{
916 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
917 return NULL;
918
6bfa24fa
RD		 919 if (unlikely(target->req_lim < 1))
920 ++target->zero_req_lim;
47f2bce9 921
aef9ec39
RD		 922 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
923}
924
925/*
926 * Must be called with target->scsi_host->host_lock held to protect
927 * req_lim and tx_head.
928 */
929static int __srp_post_send(struct srp_target_port *target,
930 struct srp_iu *iu, int len)
931{
932 struct ib_sge list;
933 struct ib_send_wr wr, *bad_wr;
934 int ret = 0;
935
aef9ec39
RD		 936 list.addr = iu->dma;
937 list.length = len;
f5358a17 938 list.lkey = target->srp_host->dev->mr->lkey;
aef9ec39
RD		 939
940 wr.next = NULL;
941 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
942 wr.sg_list = &list;
943 wr.num_sge = 1;
944 wr.opcode = IB_WR_SEND;
945 wr.send_flags = IB_SEND_SIGNALED;
946
947 ret = ib_post_send(target->qp, &wr, &bad_wr);
948
949 if (!ret) {
950 ++target->tx_head;
951 --target->req_lim;
952 }
953
954 return ret;
955}
956
957static int srp_queuecommand(struct scsi_cmnd *scmnd,
958 void (*done)(struct scsi_cmnd *))
959{
960 struct srp_target_port *target = host_to_target(scmnd->device->host);
961 struct srp_request *req;
962 struct srp_iu *iu;
963 struct srp_cmd *cmd;
aef9ec39
RD		 964 int len;
965
966 if (target->state == SRP_TARGET_CONNECTING)
967 goto err;
968
969 if (target->state == SRP_TARGET_DEAD ||
970 target->state == SRP_TARGET_REMOVED) {
971 scmnd->result = DID_BAD_TARGET << 16;
972 done(scmnd);
973 return 0;
974 }
975
976 iu = __srp_get_tx_iu(target);
977 if (!iu)
978 goto err;
979
f5358a17 980 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
74b0a15b 981 srp_max_iu_len, DMA_TO_DEVICE);
aef9ec39 982
d945e1df 983 req = list_entry(target->free_reqs.next, struct srp_request, list);
aef9ec39
RD		 984
985 scmnd->scsi_done = done;
986 scmnd->result = 0;
d945e1df 987 scmnd->host_scribble = (void *) (long) req->index;
aef9ec39
RD		 988
989 cmd = iu->buf;
990 memset(cmd, 0, sizeof *cmd);
991
992 cmd->opcode = SRP_CMD;
993 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 994 cmd->tag = req->index;
aef9ec39
RD		 995 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
996
aef9ec39
RD		 997 req->scmnd = scmnd;
998 req->cmd = iu;
999 req->cmd_done = 0;
1000 req->tsk_mgmt = NULL;
1001
1002 len = srp_map_data(scmnd, target, req);
1003 if (len < 0) {
1004 printk(KERN_ERR PFX "Failed to map data\n");
1005 goto err;
1006 }
1007
1008 if (__srp_post_recv(target)) {
1009 printk(KERN_ERR PFX "Recv failed\n");
1010 goto err_unmap;
1011 }
1012
f5358a17 1013 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
74b0a15b 1014 srp_max_iu_len, DMA_TO_DEVICE);
aef9ec39
RD		 1015
1016 if (__srp_post_send(target, iu, len)) {
1017 printk(KERN_ERR PFX "Send failed\n");
1018 goto err_unmap;
1019 }
1020
d945e1df 1021 list_move_tail(&req->list, &target->req_queue);
aef9ec39
RD		 1022
1023 return 0;
1024
1025err_unmap:
1026 srp_unmap_data(scmnd, target, req);
1027
1028err:
1029 return SCSI_MLQUEUE_HOST_BUSY;
1030}
1031
1032static int srp_alloc_iu_bufs(struct srp_target_port *target)
1033{
1034 int i;
1035
1036 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1037 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1038 target->max_ti_iu_len,
1039 GFP_KERNEL, DMA_FROM_DEVICE);
1040 if (!target->rx_ring[i])
1041 goto err;
1042 }
1043
1044 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1045 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
74b0a15b 1046 srp_max_iu_len,
aef9ec39
RD		 1047 GFP_KERNEL, DMA_TO_DEVICE);
1048 if (!target->tx_ring[i])
1049 goto err;
1050 }
1051
1052 return 0;
1053
1054err:
1055 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1056 srp_free_iu(target->srp_host, target->rx_ring[i]);
1057 target->rx_ring[i] = NULL;
1058 }
1059
1060 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1061 srp_free_iu(target->srp_host, target->tx_ring[i]);
1062 target->tx_ring[i] = NULL;
1063 }
1064
1065 return -ENOMEM;
1066}
1067
1068static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1069 struct ib_cm_event *event,
1070 struct srp_target_port *target)
1071{
1072 struct ib_class_port_info *cpi;
1073 int opcode;
1074
1075 switch (event->param.rej_rcvd.reason) {
1076 case IB_CM_REJ_PORT_CM_REDIRECT:
1077 cpi = event->param.rej_rcvd.ari;
1078 target->path.dlid = cpi->redirect_lid;
1079 target->path.pkey = cpi->redirect_pkey;
1080 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1081 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1082
1083 target->status = target->path.dlid ?
1084 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1085 break;
1086
1087 case IB_CM_REJ_PORT_REDIRECT:
1088 if (topspin_workarounds &&
1089 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1090 /*
1091 * Topspin/Cisco SRP gateways incorrectly send
1092 * reject reason code 25 when they mean 24
1093 * (port redirect).
1094 */
1095 memcpy(target->path.dgid.raw,
1096 event->param.rej_rcvd.ari, 16);
1097
1098 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1099 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1100 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1101
1102 target->status = SRP_PORT_REDIRECT;
1103 } else {
1104 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1105 target->status = -ECONNRESET;
1106 }
1107 break;
1108
1109 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1110 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1111 target->status = -ECONNRESET;
1112 break;
1113
1114 case IB_CM_REJ_CONSUMER_DEFINED:
1115 opcode = *(u8 *) event->private_data;
1116 if (opcode == SRP_LOGIN_REJ) {
1117 struct srp_login_rej *rej = event->private_data;
1118 u32 reason = be32_to_cpu(rej->reason);
1119
1120 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1121 printk(KERN_WARNING PFX
1122 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1123 else
1124 printk(KERN_WARNING PFX
1125 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1126 } else
1127 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1128 " opcode 0x%02x\n", opcode);
1129 target->status = -ECONNRESET;
1130 break;
1131
1132 default:
1133 printk(KERN_WARNING " REJ reason 0x%x\n",
1134 event->param.rej_rcvd.reason);
1135 target->status = -ECONNRESET;
1136 }
1137}
1138
1139static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1140{
1141 struct srp_target_port *target = cm_id->context;
1142 struct ib_qp_attr *qp_attr = NULL;
1143 int attr_mask = 0;
1144 int comp = 0;
1145 int opcode = 0;
1146
1147 switch (event->event) {
1148 case IB_CM_REQ_ERROR:
1149 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1150 comp = 1;
1151 target->status = -ECONNRESET;
1152 break;
1153
1154 case IB_CM_REP_RECEIVED:
1155 comp = 1;
1156 opcode = *(u8 *) event->private_data;
1157
1158 if (opcode == SRP_LOGIN_RSP) {
1159 struct srp_login_rsp *rsp = event->private_data;
1160
1161 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1162 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1163
1164 target->scsi_host->can_queue = min(target->req_lim,
1165 target->scsi_host->can_queue);
1166 } else {
1167 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1168 target->status = -ECONNRESET;
1169 break;
1170 }
1171
1172 target->status = srp_alloc_iu_bufs(target);
1173 if (target->status)
1174 break;
1175
1176 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1177 if (!qp_attr) {
1178 target->status = -ENOMEM;
1179 break;
1180 }
1181
1182 qp_attr->qp_state = IB_QPS_RTR;
1183 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1184 if (target->status)
1185 break;
1186
1187 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1188 if (target->status)
1189 break;
1190
1191 target->status = srp_post_recv(target);
1192 if (target->status)
1193 break;
1194
1195 qp_attr->qp_state = IB_QPS_RTS;
1196 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1197 if (target->status)
1198 break;
1199
1200 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1201 if (target->status)
1202 break;
1203
1204 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1205 if (target->status)
1206 break;
1207
1208 break;
1209
1210 case IB_CM_REJ_RECEIVED:
1211 printk(KERN_DEBUG PFX "REJ received\n");
1212 comp = 1;
1213
1214 srp_cm_rej_handler(cm_id, event, target);
1215 break;
1216
b7ac4ab4
IR		 1217 case IB_CM_DREQ_RECEIVED:
1218 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1219 if (ib_send_cm_drep(cm_id, NULL, 0))
1220 printk(KERN_ERR PFX "Sending CM DREP failed\n");
aef9ec39
RD		 1221 break;
1222
1223 case IB_CM_TIMEWAIT_EXIT:
1224 printk(KERN_ERR PFX "connection closed\n");
1225
1226 comp = 1;
1227 target->status = 0;
1228 break;
1229
b7ac4ab4
IR		 1230 case IB_CM_MRA_RECEIVED:
1231 case IB_CM_DREQ_ERROR:
1232 case IB_CM_DREP_RECEIVED:
1233 break;
1234
aef9ec39
RD		 1235 default:
1236 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1237 break;
1238 }
1239
1240 if (comp)
1241 complete(&target->done);
1242
1243 kfree(qp_attr);
1244
1245 return 0;
1246}
1247
d945e1df
RD		 1248static int srp_send_tsk_mgmt(struct srp_target_port *target,
1249 struct srp_request *req, u8 func)
aef9ec39 1250{
aef9ec39
RD		 1251 struct srp_iu *iu;
1252 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39
RD		 1253
1254 spin_lock_irq(target->scsi_host->host_lock);
1255
1285b3a0
RD		 1256 if (target->state == SRP_TARGET_DEAD ||
1257 target->state == SRP_TARGET_REMOVED) {
d945e1df 1258 req->scmnd->result = DID_BAD_TARGET << 16;
1285b3a0
RD		 1259 goto out;
1260 }
1261
aef9ec39
RD		 1262 init_completion(&req->done);
1263
1264 iu = __srp_get_tx_iu(target);
1265 if (!iu)
1266 goto out;
1267
1268 tsk_mgmt = iu->buf;
1269 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1270
1271 tsk_mgmt->opcode = SRP_TSK_MGMT;
d945e1df
RD		 1272 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1273 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
aef9ec39 1274 tsk_mgmt->tsk_mgmt_func = func;
d945e1df 1275 tsk_mgmt->task_tag = req->index;
aef9ec39
RD		 1276
1277 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1278 goto out;
1279
1280 req->tsk_mgmt = iu;
1281
1282 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df 1283
aef9ec39
RD		 1284 if (!wait_for_completion_timeout(&req->done,
1285 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1286 return -1;
aef9ec39 1287
d945e1df 1288 return 0;
aef9ec39
RD		 1289
1290out:
1291 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df
RD		 1292 return -1;
1293}
1294
1295static int srp_find_req(struct srp_target_port *target,
1296 struct scsi_cmnd *scmnd,
1297 struct srp_request **req)
1298{
1299 if (scmnd->host_scribble == (void *) -1L)
1300 return -1;
1301
1302 *req = &target->req_ring[(long) scmnd->host_scribble];
1303
1304 return 0;
aef9ec39
RD		 1305}
1306
1307static int srp_abort(struct scsi_cmnd *scmnd)
1308{
d945e1df
RD		 1309 struct srp_target_port *target = host_to_target(scmnd->device->host);
1310 struct srp_request *req;
1311 int ret = SUCCESS;
1312
aef9ec39
RD		 1313 printk(KERN_ERR "SRP abort called\n");
1314
d945e1df
RD		 1315 if (srp_find_req(target, scmnd, &req))
1316 return FAILED;
1317 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1318 return FAILED;
1319
1320 spin_lock_irq(target->scsi_host->host_lock);
1321
1322 if (req->cmd_done) {
1323 srp_remove_req(target, req);
1324 scmnd->scsi_done(scmnd);
1325 } else if (!req->tsk_status) {
1326 srp_remove_req(target, req);
1327 scmnd->result = DID_ABORT << 16;
1328 } else
1329 ret = FAILED;
1330
1331 spin_unlock_irq(target->scsi_host->host_lock);
1332
1333 return ret;
aef9ec39
RD		 1334}
1335
1336static int srp_reset_device(struct scsi_cmnd *scmnd)
1337{
d945e1df
RD		 1338 struct srp_target_port *target = host_to_target(scmnd->device->host);
1339 struct srp_request *req, *tmp;
1340
aef9ec39
RD		 1341 printk(KERN_ERR "SRP reset_device called\n");
1342
d945e1df
RD		 1343 if (srp_find_req(target, scmnd, &req))
1344 return FAILED;
1345 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1346 return FAILED;
1347 if (req->tsk_status)
1348 return FAILED;
1349
1350 spin_lock_irq(target->scsi_host->host_lock);
1351
1352 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
526b4caa
IR		 1353 if (req->scmnd->device == scmnd->device)
1354 srp_reset_req(target, req);
d945e1df
RD		 1355
1356 spin_unlock_irq(target->scsi_host->host_lock);
1357
1358 return SUCCESS;
aef9ec39
RD		 1359}
1360
1361static int srp_reset_host(struct scsi_cmnd *scmnd)
1362{
1363 struct srp_target_port *target = host_to_target(scmnd->device->host);
1364 int ret = FAILED;
1365
1366 printk(KERN_ERR PFX "SRP reset_host called\n");
1367
1368 if (!srp_reconnect_target(target))
1369 ret = SUCCESS;
1370
1371 return ret;
1372}
1373
6ecb0c84
RD		 1374static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1375{
1376 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1377
1378 if (target->state == SRP_TARGET_DEAD ||
1379 target->state == SRP_TARGET_REMOVED)
1380 return -ENODEV;
1381
1382 return sprintf(buf, "0x%016llx\n",
1383 (unsigned long long) be64_to_cpu(target->id_ext));
1384}
1385
1386static ssize_t show_ioc_guid(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->ioc_guid));
1396}
1397
1398static ssize_t show_service_id(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->service_id));
1408}
1409
1410static ssize_t show_pkey(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%04x\n", be16_to_cpu(target->path.pkey));
1419}
1420
1421static ssize_t show_dgid(struct class_device *cdev, char *buf)
1422{
1423 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1424
1425 if (target->state == SRP_TARGET_DEAD ||
1426 target->state == SRP_TARGET_REMOVED)
1427 return -ENODEV;
1428
1429 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1430 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1431 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1432 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1433 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1434 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1435 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1436 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1437 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1438}
1439
6bfa24fa
RD		 1440static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1441{
1442 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1443
1444 if (target->state == SRP_TARGET_DEAD ||
1445 target->state == SRP_TARGET_REMOVED)
1446 return -ENODEV;
1447
1448 return sprintf(buf, "%d\n", target->zero_req_lim);
1449}
1450
6ecb0c84
RD		 1451static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1452static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1453static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1454static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1455static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
6bfa24fa 1456static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
6ecb0c84
RD		 1457
1458static struct class_device_attribute *srp_host_attrs[] = {
1459 &class_device_attr_id_ext,
1460 &class_device_attr_ioc_guid,
1461 &class_device_attr_service_id,
1462 &class_device_attr_pkey,
1463 &class_device_attr_dgid,
6bfa24fa 1464 &class_device_attr_zero_req_lim,
6ecb0c84
RD		 1465 NULL
1466};
1467
aef9ec39
RD		 1468static struct scsi_host_template srp_template = {
1469 .module = THIS_MODULE,
1470 .name = DRV_NAME,
1471 .info = srp_target_info,
1472 .queuecommand = srp_queuecommand,
1473 .eh_abort_handler = srp_abort,
1474 .eh_device_reset_handler = srp_reset_device,
1475 .eh_host_reset_handler = srp_reset_host,
1476 .can_queue = SRP_SQ_SIZE,
1477 .this_id = -1,
aef9ec39 1478 .cmd_per_lun = SRP_SQ_SIZE,
6ecb0c84
RD		 1479 .use_clustering = ENABLE_CLUSTERING,
1480 .shost_attrs = srp_host_attrs
aef9ec39
RD		 1481};
1482
1483static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1484{
1485 sprintf(target->target_name, "SRP.T10:%016llX",
1486 (unsigned long long) be64_to_cpu(target->id_ext));
1487
f5358a17 1488 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
aef9ec39
RD		 1489 return -ENODEV;
1490
b3589fd4 1491 spin_lock(&host->target_lock);
aef9ec39 1492 list_add_tail(&target->list, &host->target_list);
b3589fd4 1493 spin_unlock(&host->target_lock);
aef9ec39
RD		 1494
1495 target->state = SRP_TARGET_LIVE;
1496
aef9ec39 1497 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 1498 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 1499
1500 return 0;
1501}
1502
1503static void srp_release_class_dev(struct class_device *class_dev)
1504{
1505 struct srp_host *host =
1506 container_of(class_dev, struct srp_host, class_dev);
1507
1508 complete(&host->released);
1509}
1510
1511static struct class srp_class = {
1512 .name = "infiniband_srp",
1513 .release = srp_release_class_dev
1514};
1515
1516/*
1517 * Target ports are added by writing
1518 *
1519 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1520 * pkey=<P_Key>,service_id=<service ID>
1521 *
1522 * to the add_target sysfs attribute.
1523 */
1524enum {
1525 SRP_OPT_ERR = 0,
1526 SRP_OPT_ID_EXT = 1 << 0,
1527 SRP_OPT_IOC_GUID = 1 << 1,
1528 SRP_OPT_DGID = 1 << 2,
1529 SRP_OPT_PKEY = 1 << 3,
1530 SRP_OPT_SERVICE_ID = 1 << 4,
1531 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 1532 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 1533 SRP_OPT_IO_CLASS = 1 << 7,
aef9ec39
RD		 1534 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1535 SRP_OPT_IOC_GUID |
1536 SRP_OPT_DGID |
1537 SRP_OPT_PKEY |
1538 SRP_OPT_SERVICE_ID),
1539};
1540
1541static match_table_t srp_opt_tokens = {
52fb2b50
VP		 1542 { SRP_OPT_ID_EXT, "id_ext=%s" },
1543 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1544 { SRP_OPT_DGID, "dgid=%s" },
1545 { SRP_OPT_PKEY, "pkey=%x" },
1546 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1547 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1548 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 1549 { SRP_OPT_IO_CLASS, "io_class=%x" },
52fb2b50 1550 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 1551};
1552
1553static int srp_parse_options(const char *buf, struct srp_target_port *target)
1554{
1555 char *options, *sep_opt;
1556 char *p;
1557 char dgid[3];
1558 substring_t args[MAX_OPT_ARGS];
1559 int opt_mask = 0;
1560 int token;
1561 int ret = -EINVAL;
1562 int i;
1563
1564 options = kstrdup(buf, GFP_KERNEL);
1565 if (!options)
1566 return -ENOMEM;
1567
1568 sep_opt = options;
1569 while ((p = strsep(&sep_opt, ",")) != NULL) {
1570 if (!*p)
1571 continue;
1572
1573 token = match_token(p, srp_opt_tokens, args);
1574 opt_mask |= token;
1575
1576 switch (token) {
1577 case SRP_OPT_ID_EXT:
1578 p = match_strdup(args);
1579 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1580 kfree(p);
1581 break;
1582
1583 case SRP_OPT_IOC_GUID:
1584 p = match_strdup(args);
1585 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1586 kfree(p);
1587 break;
1588
1589 case SRP_OPT_DGID:
1590 p = match_strdup(args);
1591 if (strlen(p) != 32) {
1592 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
ce1823f0 1593 kfree(p);
aef9ec39
RD		 1594 goto out;
1595 }
1596
1597 for (i = 0; i < 16; ++i) {
1598 strlcpy(dgid, p + i * 2, 3);
1599 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1600 }
bf17c1c7 1601 kfree(p);
aef9ec39
RD		 1602 break;
1603
1604 case SRP_OPT_PKEY:
1605 if (match_hex(args, &token)) {
1606 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1607 goto out;
1608 }
1609 target->path.pkey = cpu_to_be16(token);
1610 break;
1611
1612 case SRP_OPT_SERVICE_ID:
1613 p = match_strdup(args);
1614 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1615 kfree(p);
1616 break;
1617
1618 case SRP_OPT_MAX_SECT:
1619 if (match_int(args, &token)) {
1620 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1621 goto out;
1622 }
1623 target->scsi_host->max_sectors = token;
1624 break;
1625
52fb2b50
VP		 1626 case SRP_OPT_MAX_CMD_PER_LUN:
1627 if (match_int(args, &token)) {
1628 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1629 goto out;
1630 }
1631 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1632 break;
1633
0c0450db
R		 1634 case SRP_OPT_IO_CLASS:
1635 if (match_hex(args, &token)) {
1636 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1637 goto out;
1638 }
1639 if (token != SRP_REV10_IB_IO_CLASS &&
1640 token != SRP_REV16A_IB_IO_CLASS) {
1641 printk(KERN_WARNING PFX "unknown IO class parameter value"
1642 " %x specified (use %x or %x).\n",
1643 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1644 goto out;
1645 }
1646 target->io_class = token;
1647 break;
1648
aef9ec39
RD		 1649 default:
1650 printk(KERN_WARNING PFX "unknown parameter or missing value "
1651 "'%s' in target creation request\n", p);
1652 goto out;
1653 }
1654 }
1655
1656 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1657 ret = 0;
1658 else
1659 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1660 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1661 !(srp_opt_tokens[i].token & opt_mask))
1662 printk(KERN_WARNING PFX "target creation request is "
1663 "missing parameter '%s'\n",
1664 srp_opt_tokens[i].pattern);
1665
1666out:
1667 kfree(options);
1668 return ret;
1669}
1670
1671static ssize_t srp_create_target(struct class_device *class_dev,
1672 const char *buf, size_t count)
1673{
1674 struct srp_host *host =
1675 container_of(class_dev, struct srp_host, class_dev);
1676 struct Scsi_Host *target_host;
1677 struct srp_target_port *target;
1678 int ret;
1679 int i;
1680
1681 target_host = scsi_host_alloc(&srp_template,
1682 sizeof (struct srp_target_port));
1683 if (!target_host)
1684 return -ENOMEM;
1685
5f068992
RD		 1686 target_host->max_lun = SRP_MAX_LUN;
1687
aef9ec39
RD		 1688 target = host_to_target(target_host);
1689 memset(target, 0, sizeof *target);
1690
0c0450db 1691 target->io_class = SRP_REV16A_IB_IO_CLASS;
aef9ec39
RD		 1692 target->scsi_host = target_host;
1693 target->srp_host = host;
1694
1695 INIT_WORK(&target->work, srp_reconnect_work, target);
1696
d945e1df 1697 INIT_LIST_HEAD(&target->free_reqs);
aef9ec39 1698 INIT_LIST_HEAD(&target->req_queue);
d945e1df
RD		 1699 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1700 target->req_ring[i].index = i;
1701 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1702 }
aef9ec39
RD		 1703
1704 ret = srp_parse_options(buf, target);
1705 if (ret)
1706 goto err;
1707
f5358a17 1708 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
aef9ec39
RD		 1709
1710 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1711 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1712 (unsigned long long) be64_to_cpu(target->id_ext),
1713 (unsigned long long) be64_to_cpu(target->ioc_guid),
1714 be16_to_cpu(target->path.pkey),
1715 (unsigned long long) be64_to_cpu(target->service_id),
1716 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1717 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1718 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1719 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1720 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1721 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1722 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1723 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1724
1725 ret = srp_create_target_ib(target);
1726 if (ret)
1727 goto err;
1728
f5358a17 1729 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
aef9ec39
RD		 1730 if (IS_ERR(target->cm_id)) {
1731 ret = PTR_ERR(target->cm_id);
1732 goto err_free;
1733 }
1734
1735 ret = srp_connect_target(target);
1736 if (ret) {
1737 printk(KERN_ERR PFX "Connection failed\n");
1738 goto err_cm_id;
1739 }
1740
1741 ret = srp_add_target(host, target);
1742 if (ret)
1743 goto err_disconnect;
1744
1745 return count;
1746
1747err_disconnect:
1748 srp_disconnect_target(target);
1749
1750err_cm_id:
1751 ib_destroy_cm_id(target->cm_id);
1752
1753err_free:
1754 srp_free_target_ib(target);
1755
1756err:
1757 scsi_host_put(target_host);
1758
1759 return ret;
1760}
1761
1762static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1763
1764static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1765{
1766 struct srp_host *host =
1767 container_of(class_dev, struct srp_host, class_dev);
1768
f5358a17 1769 return sprintf(buf, "%s\n", host->dev->dev->name);
aef9ec39
RD		 1770}
1771
1772static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1773
1774static ssize_t show_port(struct class_device *class_dev, char *buf)
1775{
1776 struct srp_host *host =
1777 container_of(class_dev, struct srp_host, class_dev);
1778
1779 return sprintf(buf, "%d\n", host->port);
1780}
1781
1782static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1783
f5358a17 1784static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 1785{
1786 struct srp_host *host;
1787
1788 host = kzalloc(sizeof *host, GFP_KERNEL);
1789 if (!host)
1790 return NULL;
1791
1792 INIT_LIST_HEAD(&host->target_list);
b3589fd4 1793 spin_lock_init(&host->target_lock);
aef9ec39
RD		 1794 init_completion(&host->released);
1795 host->dev = device;
1796 host->port = port;
1797
1798 host->initiator_port_id[7] = port;
f5358a17 1799 memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8);
aef9ec39
RD		 1800
1801 host->class_dev.class = &srp_class;
f5358a17 1802 host->class_dev.dev = device->dev->dma_device;
aef9ec39 1803 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
f5358a17 1804 device->dev->name, port);
aef9ec39
RD		 1805
1806 if (class_device_register(&host->class_dev))
f5358a17 1807 goto free_host;
aef9ec39
RD		 1808 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1809 goto err_class;
1810 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1811 goto err_class;
1812 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1813 goto err_class;
1814
1815 return host;
1816
1817err_class:
1818 class_device_unregister(&host->class_dev);
1819
f5358a17 1820free_host:
aef9ec39
RD		 1821 kfree(host);
1822
1823 return NULL;
1824}
1825
1826static void srp_add_one(struct ib_device *device)
1827{
f5358a17
RD		 1828 struct srp_device *srp_dev;
1829 struct ib_device_attr *dev_attr;
1830 struct ib_fmr_pool_param fmr_param;
aef9ec39 1831 struct srp_host *host;
aef9ec39
RD		 1832 int s, e, p;
1833
f5358a17
RD		 1834 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1835 if (!dev_attr)
cf311cd4 1836 return;
aef9ec39 1837
f5358a17
RD		 1838 if (ib_query_device(device, dev_attr)) {
1839 printk(KERN_WARNING PFX "Query device failed for %s\n",
1840 device->name);
1841 goto free_attr;
1842 }
1843
1844 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1845 if (!srp_dev)
1846 goto free_attr;
1847
1848 /*
1849 * Use the smallest page size supported by the HCA, down to a
1850 * minimum of 512 bytes (which is the smallest sector that a
1851 * SCSI command will ever carry).
1852 */
1853 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1854 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
1855 srp_dev->fmr_page_mask = ~((unsigned long) srp_dev->fmr_page_size - 1);
1856
1857 INIT_LIST_HEAD(&srp_dev->dev_list);
1858
1859 srp_dev->dev = device;
1860 srp_dev->pd = ib_alloc_pd(device);
1861 if (IS_ERR(srp_dev->pd))
1862 goto free_dev;
1863
1864 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1865 IB_ACCESS_LOCAL_WRITE |
1866 IB_ACCESS_REMOTE_READ |
1867 IB_ACCESS_REMOTE_WRITE);
1868 if (IS_ERR(srp_dev->mr))
1869 goto err_pd;
1870
1871 memset(&fmr_param, 0, sizeof fmr_param);
1872 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
1873 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
1874 fmr_param.cache = 1;
1875 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1876 fmr_param.page_shift = srp_dev->fmr_page_shift;
1877 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
1878 IB_ACCESS_REMOTE_WRITE |
1879 IB_ACCESS_REMOTE_READ);
1880
1881 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1882 if (IS_ERR(srp_dev->fmr_pool))
1883 srp_dev->fmr_pool = NULL;
aef9ec39
RD		 1884
1885 if (device->node_type == IB_NODE_SWITCH) {
1886 s = 0;
1887 e = 0;
1888 } else {
1889 s = 1;
1890 e = device->phys_port_cnt;
1891 }
1892
1893 for (p = s; p <= e; ++p) {
f5358a17 1894 host = srp_add_port(srp_dev, p);
aef9ec39 1895 if (host)
f5358a17 1896 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 1897 }
1898
f5358a17
RD		 1899 ib_set_client_data(device, &srp_client, srp_dev);
1900
1901 goto free_attr;
1902
1903err_pd:
1904 ib_dealloc_pd(srp_dev->pd);
1905
1906free_dev:
1907 kfree(srp_dev);
1908
1909free_attr:
1910 kfree(dev_attr);
aef9ec39
RD		 1911}
1912
1913static void srp_remove_one(struct ib_device *device)
1914{
f5358a17 1915 struct srp_device *srp_dev;
aef9ec39
RD		 1916 struct srp_host *host, *tmp_host;
1917 LIST_HEAD(target_list);
1918 struct srp_target_port *target, *tmp_target;
aef9ec39 1919
f5358a17 1920 srp_dev = ib_get_client_data(device, &srp_client);
aef9ec39 1921
f5358a17 1922 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
aef9ec39
RD		 1923 class_device_unregister(&host->class_dev);
1924 /*
1925 * Wait for the sysfs entry to go away, so that no new
1926 * target ports can be created.
1927 */
1928 wait_for_completion(&host->released);
1929
1930 /*
1931 * Mark all target ports as removed, so we stop queueing
1932 * commands and don't try to reconnect.
1933 */
b3589fd4 1934 spin_lock(&host->target_lock);
549c5fc2 1935 list_for_each_entry(target, &host->target_list, list) {
0c5b3952
IR		 1936 spin_lock_irq(target->scsi_host->host_lock);
1937 target->state = SRP_TARGET_REMOVED;
1938 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39 1939 }
b3589fd4 1940 spin_unlock(&host->target_lock);
aef9ec39
RD		 1941
1942 /*
1943 * Wait for any reconnection tasks that may have
1944 * started before we marked our target ports as
1945 * removed, and any target port removal tasks.
1946 */
1947 flush_scheduled_work();
1948
1949 list_for_each_entry_safe(target, tmp_target,
1950 &host->target_list, list) {
1951 scsi_remove_host(target->scsi_host);
1952 srp_disconnect_target(target);
1953 ib_destroy_cm_id(target->cm_id);
1954 srp_free_target_ib(target);
1955 scsi_host_put(target->scsi_host);
1956 }
1957
aef9ec39
RD		 1958 kfree(host);
1959 }
1960
f5358a17
RD		 1961 if (srp_dev->fmr_pool)
1962 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1963 ib_dereg_mr(srp_dev->mr);
1964 ib_dealloc_pd(srp_dev->pd);
1965
1966 kfree(srp_dev);
aef9ec39
RD		 1967}
1968
1969static int __init srp_init_module(void)
1970{
1971 int ret;
1972
74b0a15b
VP		 1973 srp_template.sg_tablesize = srp_sg_tablesize;
1974 srp_max_iu_len = (sizeof (struct srp_cmd) +
1975 sizeof (struct srp_indirect_buf) +
1976 srp_sg_tablesize * 16);
1977
aef9ec39
RD		 1978 ret = class_register(&srp_class);
1979 if (ret) {
1980 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1981 return ret;
1982 }
1983
1984 ret = ib_register_client(&srp_client);
1985 if (ret) {
1986 printk(KERN_ERR PFX "couldn't register IB client\n");
1987 class_unregister(&srp_class);
1988 return ret;
1989 }
1990
1991 return 0;
1992}
1993
1994static void __exit srp_cleanup_module(void)
1995{
1996 ib_unregister_client(&srp_client);
1997 class_unregister(&srp_class);
1998}
1999
2000module_init(srp_init_module);
2001module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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