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x86: cpa self-test, WARN_ON()
[wrt350n-kernel.git] / drivers / infiniband / ulp / srp / ib_srp.c
blobf2d2c7e2c76b9cd1b778da992a481b65e575bf7a
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 int mellanox_workarounds = 1;
80
81 module_param(mellanox_workarounds, int, 0444);
82 MODULE_PARM_DESC(mellanox_workarounds,
83 "Enable workarounds for Mellanox SRP target bugs if != 0");
84
85 static void srp_add_one(struct ib_device *device);
86 static void srp_remove_one(struct ib_device *device);
87 static void srp_completion(struct ib_cq *cq, void *target_ptr);
88 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
89
90 static struct scsi_transport_template *ib_srp_transport_template;
91
92 static struct ib_client srp_client = {
93 .name = "srp",
94 .add = srp_add_one,
95 .remove = srp_remove_one
96 };
97
98 static struct ib_sa_client srp_sa_client;
99
100 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
101 {
102 return (struct srp_target_port *) host->hostdata;
103 }
104
105 static const char *srp_target_info(struct Scsi_Host *host)
106 {
107 return host_to_target(host)->target_name;
108 }
109
110 static int srp_target_is_topspin(struct srp_target_port *target)
111 {
112 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
113 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
114
115 return topspin_workarounds &&
116 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
117 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
118 }
119
120 static int srp_target_is_mellanox(struct srp_target_port *target)
121 {
122 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
123
124 return mellanox_workarounds &&
125 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
126 }
127
128 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
129 gfp_t gfp_mask,
130 enum dma_data_direction direction)
131 {
132 struct srp_iu *iu;
133
134 iu = kmalloc(sizeof *iu, gfp_mask);
135 if (!iu)
136 goto out;
137
138 iu->buf = kzalloc(size, gfp_mask);
139 if (!iu->buf)
140 goto out_free_iu;
141
142 iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction);
143 if (ib_dma_mapping_error(host->dev->dev, iu->dma))
144 goto out_free_buf;
145
146 iu->size = size;
147 iu->direction = direction;
148
149 return iu;
150
151 out_free_buf:
152 kfree(iu->buf);
153 out_free_iu:
154 kfree(iu);
155 out:
156 return NULL;
157 }
158
159 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
160 {
161 if (!iu)
162 return;
163
164 ib_dma_unmap_single(host->dev->dev, iu->dma, iu->size, iu->direction);
165 kfree(iu->buf);
166 kfree(iu);
167 }
168
169 static void srp_qp_event(struct ib_event *event, void *context)
170 {
171 printk(KERN_ERR PFX "QP event %d\n", event->event);
172 }
173
174 static int srp_init_qp(struct srp_target_port *target,
175 struct ib_qp *qp)
176 {
177 struct ib_qp_attr *attr;
178 int ret;
179
180 attr = kmalloc(sizeof *attr, GFP_KERNEL);
181 if (!attr)
182 return -ENOMEM;
183
184 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
185 target->srp_host->port,
186 be16_to_cpu(target->path.pkey),
187 &attr->pkey_index);
188 if (ret)
189 goto out;
190
191 attr->qp_state = IB_QPS_INIT;
192 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
193 IB_ACCESS_REMOTE_WRITE);
194 attr->port_num = target->srp_host->port;
195
196 ret = ib_modify_qp(qp, attr,
197 IB_QP_STATE |
198 IB_QP_PKEY_INDEX |
199 IB_QP_ACCESS_FLAGS |
200 IB_QP_PORT);
201
202 out:
203 kfree(attr);
204 return ret;
205 }
206
207 static int srp_create_target_ib(struct srp_target_port *target)
208 {
209 struct ib_qp_init_attr *init_attr;
210 int ret;
211
212 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
213 if (!init_attr)
214 return -ENOMEM;
215
216 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
217 NULL, target, SRP_CQ_SIZE, 0);
218 if (IS_ERR(target->cq)) {
219 ret = PTR_ERR(target->cq);
220 goto out;
221 }
222
223 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
224
225 init_attr->event_handler = srp_qp_event;
226 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
227 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
228 init_attr->cap.max_recv_sge = 1;
229 init_attr->cap.max_send_sge = 1;
230 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
231 init_attr->qp_type = IB_QPT_RC;
232 init_attr->send_cq = target->cq;
233 init_attr->recv_cq = target->cq;
234
235 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
236 if (IS_ERR(target->qp)) {
237 ret = PTR_ERR(target->qp);
238 ib_destroy_cq(target->cq);
239 goto out;
240 }
241
242 ret = srp_init_qp(target, target->qp);
243 if (ret) {
244 ib_destroy_qp(target->qp);
245 ib_destroy_cq(target->cq);
246 goto out;
247 }
248
249 out:
250 kfree(init_attr);
251 return ret;
252 }
253
254 static void srp_free_target_ib(struct srp_target_port *target)
255 {
256 int i;
257
258 ib_destroy_qp(target->qp);
259 ib_destroy_cq(target->cq);
260
261 for (i = 0; i < SRP_RQ_SIZE; ++i)
262 srp_free_iu(target->srp_host, target->rx_ring[i]);
263 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
264 srp_free_iu(target->srp_host, target->tx_ring[i]);
265 }
266
267 static void srp_path_rec_completion(int status,
268 struct ib_sa_path_rec *pathrec,
269 void *target_ptr)
270 {
271 struct srp_target_port *target = target_ptr;
272
273 target->status = status;
274 if (status)
275 shost_printk(KERN_ERR, target->scsi_host,
276 PFX "Got failed path rec status %d\n", status);
277 else
278 target->path = *pathrec;
279 complete(&target->done);
280 }
281
282 static int srp_lookup_path(struct srp_target_port *target)
283 {
284 target->path.numb_path = 1;
285
286 init_completion(&target->done);
287
288 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
289 target->srp_host->dev->dev,
290 target->srp_host->port,
291 &target->path,
292 IB_SA_PATH_REC_SERVICE_ID |
293 IB_SA_PATH_REC_DGID |
294 IB_SA_PATH_REC_SGID |
295 IB_SA_PATH_REC_NUMB_PATH |
296 IB_SA_PATH_REC_PKEY,
297 SRP_PATH_REC_TIMEOUT_MS,
298 GFP_KERNEL,
299 srp_path_rec_completion,
300 target, &target->path_query);
301 if (target->path_query_id < 0)
302 return target->path_query_id;
303
304 wait_for_completion(&target->done);
305
306 if (target->status < 0)
307 shost_printk(KERN_WARNING, target->scsi_host,
308 PFX "Path record query failed\n");
309
310 return target->status;
311 }
312
313 static int srp_send_req(struct srp_target_port *target)
314 {
315 struct {
316 struct ib_cm_req_param param;
317 struct srp_login_req priv;
318 } *req = NULL;
319 int status;
320
321 req = kzalloc(sizeof *req, GFP_KERNEL);
322 if (!req)
323 return -ENOMEM;
324
325 req->param.primary_path = &target->path;
326 req->param.alternate_path = NULL;
327 req->param.service_id = target->service_id;
328 req->param.qp_num = target->qp->qp_num;
329 req->param.qp_type = target->qp->qp_type;
330 req->param.private_data = &req->priv;
331 req->param.private_data_len = sizeof req->priv;
332 req->param.flow_control = 1;
333
334 get_random_bytes(&req->param.starting_psn, 4);
335 req->param.starting_psn &= 0xffffff;
336
337 /*
338 * Pick some arbitrary defaults here; we could make these
339 * module parameters if anyone cared about setting them.
340 */
341 req->param.responder_resources = 4;
342 req->param.remote_cm_response_timeout = 20;
343 req->param.local_cm_response_timeout = 20;
344 req->param.retry_count = 7;
345 req->param.rnr_retry_count = 7;
346 req->param.max_cm_retries = 15;
347
348 req->priv.opcode = SRP_LOGIN_REQ;
349 req->priv.tag = 0;
350 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
351 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
352 SRP_BUF_FORMAT_INDIRECT);
353 /*
354 * In the published SRP specification (draft rev. 16a), the
355 * port identifier format is 8 bytes of ID extension followed
356 * by 8 bytes of GUID. Older drafts put the two halves in the
357 * opposite order, so that the GUID comes first.
358 *
359 * Targets conforming to these obsolete drafts can be
360 * recognized by the I/O Class they report.
361 */
362 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
363 memcpy(req->priv.initiator_port_id,
364 &target->path.sgid.global.interface_id, 8);
365 memcpy(req->priv.initiator_port_id + 8,
366 &target->initiator_ext, 8);
367 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
368 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
369 } else {
370 memcpy(req->priv.initiator_port_id,
371 &target->initiator_ext, 8);
372 memcpy(req->priv.initiator_port_id + 8,
373 &target->path.sgid.global.interface_id, 8);
374 memcpy(req->priv.target_port_id, &target->id_ext, 8);
375 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
376 }
377
378 /*
379 * Topspin/Cisco SRP targets will reject our login unless we
380 * zero out the first 8 bytes of our initiator port ID and set
381 * the second 8 bytes to the local node GUID.
382 */
383 if (srp_target_is_topspin(target)) {
384 shost_printk(KERN_DEBUG, target->scsi_host,
385 PFX "Topspin/Cisco initiator port ID workaround "
386 "activated for target GUID %016llx\n",
387 (unsigned long long) be64_to_cpu(target->ioc_guid));
388 memset(req->priv.initiator_port_id, 0, 8);
389 memcpy(req->priv.initiator_port_id + 8,
390 &target->srp_host->dev->dev->node_guid, 8);
391 }
392
393 status = ib_send_cm_req(target->cm_id, &req->param);
394
395 kfree(req);
396
397 return status;
398 }
399
400 static void srp_disconnect_target(struct srp_target_port *target)
401 {
402 /* XXX should send SRP_I_LOGOUT request */
403
404 init_completion(&target->done);
405 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
406 shost_printk(KERN_DEBUG, target->scsi_host,
407 PFX "Sending CM DREQ failed\n");
408 return;
409 }
410 wait_for_completion(&target->done);
411 }
412
413 static void srp_remove_work(struct work_struct *work)
414 {
415 struct srp_target_port *target =
416 container_of(work, struct srp_target_port, work);
417
418 spin_lock_irq(target->scsi_host->host_lock);
419 if (target->state != SRP_TARGET_DEAD) {
420 spin_unlock_irq(target->scsi_host->host_lock);
421 return;
422 }
423 target->state = SRP_TARGET_REMOVED;
424 spin_unlock_irq(target->scsi_host->host_lock);
425
426 spin_lock(&target->srp_host->target_lock);
427 list_del(&target->list);
428 spin_unlock(&target->srp_host->target_lock);
429
430 srp_remove_host(target->scsi_host);
431 scsi_remove_host(target->scsi_host);
432 ib_destroy_cm_id(target->cm_id);
433 srp_free_target_ib(target);
434 scsi_host_put(target->scsi_host);
435 }
436
437 static int srp_connect_target(struct srp_target_port *target)
438 {
439 int ret;
440
441 ret = srp_lookup_path(target);
442 if (ret)
443 return ret;
444
445 while (1) {
446 init_completion(&target->done);
447 ret = srp_send_req(target);
448 if (ret)
449 return ret;
450 wait_for_completion(&target->done);
451
452 /*
453 * The CM event handling code will set status to
454 * SRP_PORT_REDIRECT if we get a port redirect REJ
455 * back, or SRP_DLID_REDIRECT if we get a lid/qp
456 * redirect REJ back.
457 */
458 switch (target->status) {
459 case 0:
460 return 0;
461
462 case SRP_PORT_REDIRECT:
463 ret = srp_lookup_path(target);
464 if (ret)
465 return ret;
466 break;
467
468 case SRP_DLID_REDIRECT:
469 break;
470
471 default:
472 return target->status;
473 }
474 }
475 }
476
477 static void srp_unmap_data(struct scsi_cmnd *scmnd,
478 struct srp_target_port *target,
479 struct srp_request *req)
480 {
481 if (!scsi_sglist(scmnd) ||
482 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
483 scmnd->sc_data_direction != DMA_FROM_DEVICE))
484 return;
485
486 if (req->fmr) {
487 ib_fmr_pool_unmap(req->fmr);
488 req->fmr = NULL;
489 }
490
491 ib_dma_unmap_sg(target->srp_host->dev->dev, scsi_sglist(scmnd),
492 scsi_sg_count(scmnd), scmnd->sc_data_direction);
493 }
494
495 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
496 {
497 srp_unmap_data(req->scmnd, target, req);
498 list_move_tail(&req->list, &target->free_reqs);
499 }
500
501 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
502 {
503 req->scmnd->result = DID_RESET << 16;
504 req->scmnd->scsi_done(req->scmnd);
505 srp_remove_req(target, req);
506 }
507
508 static int srp_reconnect_target(struct srp_target_port *target)
509 {
510 struct ib_cm_id *new_cm_id;
511 struct ib_qp_attr qp_attr;
512 struct srp_request *req, *tmp;
513 struct ib_wc wc;
514 int ret;
515
516 spin_lock_irq(target->scsi_host->host_lock);
517 if (target->state != SRP_TARGET_LIVE) {
518 spin_unlock_irq(target->scsi_host->host_lock);
519 return -EAGAIN;
520 }
521 target->state = SRP_TARGET_CONNECTING;
522 spin_unlock_irq(target->scsi_host->host_lock);
523
524 srp_disconnect_target(target);
525 /*
526 * Now get a new local CM ID so that we avoid confusing the
527 * target in case things are really fouled up.
528 */
529 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
530 srp_cm_handler, target);
531 if (IS_ERR(new_cm_id)) {
532 ret = PTR_ERR(new_cm_id);
533 goto err;
534 }
535 ib_destroy_cm_id(target->cm_id);
536 target->cm_id = new_cm_id;
537
538 qp_attr.qp_state = IB_QPS_RESET;
539 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
540 if (ret)
541 goto err;
542
543 ret = srp_init_qp(target, target->qp);
544 if (ret)
545 goto err;
546
547 while (ib_poll_cq(target->cq, 1, &wc) > 0)
548 ; /* nothing */
549
550 spin_lock_irq(target->scsi_host->host_lock);
551 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
552 srp_reset_req(target, req);
553 spin_unlock_irq(target->scsi_host->host_lock);
554
555 target->rx_head = 0;
556 target->tx_head = 0;
557 target->tx_tail = 0;
558
559 target->qp_in_error = 0;
560 ret = srp_connect_target(target);
561 if (ret)
562 goto err;
563
564 spin_lock_irq(target->scsi_host->host_lock);
565 if (target->state == SRP_TARGET_CONNECTING) {
566 ret = 0;
567 target->state = SRP_TARGET_LIVE;
568 } else
569 ret = -EAGAIN;
570 spin_unlock_irq(target->scsi_host->host_lock);
571
572 return ret;
573
574 err:
575 shost_printk(KERN_ERR, target->scsi_host,
576 PFX "reconnect failed (%d), removing target port.\n", ret);
577
578 /*
579 * We couldn't reconnect, so kill our target port off.
580 * However, we have to defer the real removal because we might
581 * be in the context of the SCSI error handler now, which
582 * would deadlock if we call scsi_remove_host().
583 */
584 spin_lock_irq(target->scsi_host->host_lock);
585 if (target->state == SRP_TARGET_CONNECTING) {
586 target->state = SRP_TARGET_DEAD;
587 INIT_WORK(&target->work, srp_remove_work);
588 schedule_work(&target->work);
589 }
590 spin_unlock_irq(target->scsi_host->host_lock);
591
592 return ret;
593 }
594
595 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
596 int sg_cnt, struct srp_request *req,
597 struct srp_direct_buf *buf)
598 {
599 u64 io_addr = 0;
600 u64 *dma_pages;
601 u32 len;
602 int page_cnt;
603 int i, j;
604 int ret;
605 struct srp_device *dev = target->srp_host->dev;
606 struct ib_device *ibdev = dev->dev;
607 struct scatterlist *sg;
608
609 if (!dev->fmr_pool)
610 return -ENODEV;
611
612 if (srp_target_is_mellanox(target) &&
613 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
614 return -EINVAL;
615
616 len = page_cnt = 0;
617 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
618 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
619
620 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
621 if (i > 0)
622 return -EINVAL;
623 else
624 ++page_cnt;
625 }
626 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
627 ~dev->fmr_page_mask) {
628 if (i < sg_cnt - 1)
629 return -EINVAL;
630 else
631 ++page_cnt;
632 }
633
634 len += dma_len;
635 }
636
637 page_cnt += len >> dev->fmr_page_shift;
638 if (page_cnt > SRP_FMR_SIZE)
639 return -ENOMEM;
640
641 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
642 if (!dma_pages)
643 return -ENOMEM;
644
645 page_cnt = 0;
646 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
647 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
648
649 for (j = 0; j < dma_len; j += dev->fmr_page_size)
650 dma_pages[page_cnt++] =
651 (ib_sg_dma_address(ibdev, sg) &
652 dev->fmr_page_mask) + j;
653 }
654
655 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
656 dma_pages, page_cnt, io_addr);
657 if (IS_ERR(req->fmr)) {
658 ret = PTR_ERR(req->fmr);
659 req->fmr = NULL;
660 goto out;
661 }
662
663 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
664 ~dev->fmr_page_mask);
665 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
666 buf->len = cpu_to_be32(len);
667
668 ret = 0;
669
670 out:
671 kfree(dma_pages);
672
673 return ret;
674 }
675
676 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
677 struct srp_request *req)
678 {
679 struct scatterlist *scat;
680 struct srp_cmd *cmd = req->cmd->buf;
681 int len, nents, count;
682 u8 fmt = SRP_DATA_DESC_DIRECT;
683 struct srp_device *dev;
684 struct ib_device *ibdev;
685
686 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
687 return sizeof (struct srp_cmd);
688
689 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
690 scmnd->sc_data_direction != DMA_TO_DEVICE) {
691 shost_printk(KERN_WARNING, target->scsi_host,
692 PFX "Unhandled data direction %d\n",
693 scmnd->sc_data_direction);
694 return -EINVAL;
695 }
696
697 nents = scsi_sg_count(scmnd);
698 scat = scsi_sglist(scmnd);
699
700 dev = target->srp_host->dev;
701 ibdev = dev->dev;
702
703 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
704
705 fmt = SRP_DATA_DESC_DIRECT;
706 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
707
708 if (count == 1) {
709 /*
710 * The midlayer only generated a single gather/scatter
711 * entry, or DMA mapping coalesced everything to a
712 * single entry. So a direct descriptor along with
713 * the DMA MR suffices.
714 */
715 struct srp_direct_buf *buf = (void *) cmd->add_data;
716
717 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
718 buf->key = cpu_to_be32(dev->mr->rkey);
719 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
720 } else if (srp_map_fmr(target, scat, count, req,
721 (void *) cmd->add_data)) {
722 /*
723 * FMR mapping failed, and the scatterlist has more
724 * than one entry. Generate an indirect memory
725 * descriptor.
726 */
727 struct srp_indirect_buf *buf = (void *) cmd->add_data;
728 struct scatterlist *sg;
729 u32 datalen = 0;
730 int i;
731
732 fmt = SRP_DATA_DESC_INDIRECT;
733 len = sizeof (struct srp_cmd) +
734 sizeof (struct srp_indirect_buf) +
735 count * sizeof (struct srp_direct_buf);
736
737 scsi_for_each_sg(scmnd, sg, count, i) {
738 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
739
740 buf->desc_list[i].va =
741 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
742 buf->desc_list[i].key =
743 cpu_to_be32(dev->mr->rkey);
744 buf->desc_list[i].len = cpu_to_be32(dma_len);
745 datalen += dma_len;
746 }
747
748 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
749 cmd->data_out_desc_cnt = count;
750 else
751 cmd->data_in_desc_cnt = count;
752
753 buf->table_desc.va =
754 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
755 buf->table_desc.key =
756 cpu_to_be32(target->srp_host->dev->mr->rkey);
757 buf->table_desc.len =
758 cpu_to_be32(count * sizeof (struct srp_direct_buf));
759
760 buf->len = cpu_to_be32(datalen);
761 }
762
763 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
764 cmd->buf_fmt = fmt << 4;
765 else
766 cmd->buf_fmt = fmt;
767
768 return len;
769 }
770
771 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
772 {
773 struct srp_request *req;
774 struct scsi_cmnd *scmnd;
775 unsigned long flags;
776 s32 delta;
777
778 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
779
780 spin_lock_irqsave(target->scsi_host->host_lock, flags);
781
782 target->req_lim += delta;
783
784 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
785
786 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
787 if (be32_to_cpu(rsp->resp_data_len) < 4)
788 req->tsk_status = -1;
789 else
790 req->tsk_status = rsp->data[3];
791 complete(&req->done);
792 } else {
793 scmnd = req->scmnd;
794 if (!scmnd)
795 shost_printk(KERN_ERR, target->scsi_host,
796 "Null scmnd for RSP w/tag %016llx\n",
797 (unsigned long long) rsp->tag);
798 scmnd->result = rsp->status;
799
800 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
801 memcpy(scmnd->sense_buffer, rsp->data +
802 be32_to_cpu(rsp->resp_data_len),
803 min_t(int, be32_to_cpu(rsp->sense_data_len),
804 SCSI_SENSE_BUFFERSIZE));
805 }
806
807 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
808 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
809 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
810 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
811
812 if (!req->tsk_mgmt) {
813 scmnd->host_scribble = (void *) -1L;
814 scmnd->scsi_done(scmnd);
815
816 srp_remove_req(target, req);
817 } else
818 req->cmd_done = 1;
819 }
820
821 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
822 }
823
824 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
825 {
826 struct ib_device *dev;
827 struct srp_iu *iu;
828 u8 opcode;
829
830 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
831
832 dev = target->srp_host->dev->dev;
833 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
834 DMA_FROM_DEVICE);
835
836 opcode = *(u8 *) iu->buf;
837
838 if (0) {
839 int i;
840
841 shost_printk(KERN_ERR, target->scsi_host,
842 PFX "recv completion, opcode 0x%02x\n", opcode);
843
844 for (i = 0; i < wc->byte_len; ++i) {
845 if (i % 8 == 0)
846 printk(KERN_ERR " [%02x] ", i);
847 printk(" %02x", ((u8 *) iu->buf)[i]);
848 if ((i + 1) % 8 == 0)
849 printk("\n");
850 }
851
852 if (wc->byte_len % 8)
853 printk("\n");
854 }
855
856 switch (opcode) {
857 case SRP_RSP:
858 srp_process_rsp(target, iu->buf);
859 break;
860
861 case SRP_T_LOGOUT:
862 /* XXX Handle target logout */
863 shost_printk(KERN_WARNING, target->scsi_host,
864 PFX "Got target logout request\n");
865 break;
866
867 default:
868 shost_printk(KERN_WARNING, target->scsi_host,
869 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
870 break;
871 }
872
873 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
874 DMA_FROM_DEVICE);
875 }
876
877 static void srp_completion(struct ib_cq *cq, void *target_ptr)
878 {
879 struct srp_target_port *target = target_ptr;
880 struct ib_wc wc;
881
882 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
883 while (ib_poll_cq(cq, 1, &wc) > 0) {
884 if (wc.status) {
885 shost_printk(KERN_ERR, target->scsi_host,
886 PFX "failed %s status %d\n",
887 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
888 wc.status);
889 target->qp_in_error = 1;
890 break;
891 }
892
893 if (wc.wr_id & SRP_OP_RECV)
894 srp_handle_recv(target, &wc);
895 else
896 ++target->tx_tail;
897 }
898 }
899
900 static int __srp_post_recv(struct srp_target_port *target)
901 {
902 struct srp_iu *iu;
903 struct ib_sge list;
904 struct ib_recv_wr wr, *bad_wr;
905 unsigned int next;
906 int ret;
907
908 next = target->rx_head & (SRP_RQ_SIZE - 1);
909 wr.wr_id = next | SRP_OP_RECV;
910 iu = target->rx_ring[next];
911
912 list.addr = iu->dma;
913 list.length = iu->size;
914 list.lkey = target->srp_host->dev->mr->lkey;
915
916 wr.next = NULL;
917 wr.sg_list = &list;
918 wr.num_sge = 1;
919
920 ret = ib_post_recv(target->qp, &wr, &bad_wr);
921 if (!ret)
922 ++target->rx_head;
923
924 return ret;
925 }
926
927 static int srp_post_recv(struct srp_target_port *target)
928 {
929 unsigned long flags;
930 int ret;
931
932 spin_lock_irqsave(target->scsi_host->host_lock, flags);
933 ret = __srp_post_recv(target);
934 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
935
936 return ret;
937 }
938
939 /*
940 * Must be called with target->scsi_host->host_lock held to protect
941 * req_lim and tx_head. Lock cannot be dropped between call here and
942 * call to __srp_post_send().
943 */
944 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
945 enum srp_request_type req_type)
946 {
947 s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
948
949 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
950 return NULL;
951
952 if (target->req_lim < min) {
953 ++target->zero_req_lim;
954 return NULL;
955 }
956
957 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
958 }
959
960 /*
961 * Must be called with target->scsi_host->host_lock held to protect
962 * req_lim and tx_head.
963 */
964 static int __srp_post_send(struct srp_target_port *target,
965 struct srp_iu *iu, int len)
966 {
967 struct ib_sge list;
968 struct ib_send_wr wr, *bad_wr;
969 int ret = 0;
970
971 list.addr = iu->dma;
972 list.length = len;
973 list.lkey = target->srp_host->dev->mr->lkey;
974
975 wr.next = NULL;
976 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
977 wr.sg_list = &list;
978 wr.num_sge = 1;
979 wr.opcode = IB_WR_SEND;
980 wr.send_flags = IB_SEND_SIGNALED;
981
982 ret = ib_post_send(target->qp, &wr, &bad_wr);
983
984 if (!ret) {
985 ++target->tx_head;
986 --target->req_lim;
987 }
988
989 return ret;
990 }
991
992 static int srp_queuecommand(struct scsi_cmnd *scmnd,
993 void (*done)(struct scsi_cmnd *))
994 {
995 struct srp_target_port *target = host_to_target(scmnd->device->host);
996 struct srp_request *req;
997 struct srp_iu *iu;
998 struct srp_cmd *cmd;
999 struct ib_device *dev;
1000 int len;
1001
1002 if (target->state == SRP_TARGET_CONNECTING)
1003 goto err;
1004
1005 if (target->state == SRP_TARGET_DEAD ||
1006 target->state == SRP_TARGET_REMOVED) {
1007 scmnd->result = DID_BAD_TARGET << 16;
1008 done(scmnd);
1009 return 0;
1010 }
1011
1012 iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1013 if (!iu)
1014 goto err;
1015
1016 dev = target->srp_host->dev->dev;
1017 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1018 DMA_TO_DEVICE);
1019
1020 req = list_entry(target->free_reqs.next, struct srp_request, list);
1021
1022 scmnd->scsi_done = done;
1023 scmnd->result = 0;
1024 scmnd->host_scribble = (void *) (long) req->index;
1025
1026 cmd = iu->buf;
1027 memset(cmd, 0, sizeof *cmd);
1028
1029 cmd->opcode = SRP_CMD;
1030 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1031 cmd->tag = req->index;
1032 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1033
1034 req->scmnd = scmnd;
1035 req->cmd = iu;
1036 req->cmd_done = 0;
1037 req->tsk_mgmt = NULL;
1038
1039 len = srp_map_data(scmnd, target, req);
1040 if (len < 0) {
1041 shost_printk(KERN_ERR, target->scsi_host,
1042 PFX "Failed to map data\n");
1043 goto err;
1044 }
1045
1046 if (__srp_post_recv(target)) {
1047 shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1048 goto err_unmap;
1049 }
1050
1051 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1052 DMA_TO_DEVICE);
1053
1054 if (__srp_post_send(target, iu, len)) {
1055 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1056 goto err_unmap;
1057 }
1058
1059 list_move_tail(&req->list, &target->req_queue);
1060
1061 return 0;
1062
1063 err_unmap:
1064 srp_unmap_data(scmnd, target, req);
1065
1066 err:
1067 return SCSI_MLQUEUE_HOST_BUSY;
1068 }
1069
1070 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1071 {
1072 int i;
1073
1074 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1075 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1076 target->max_ti_iu_len,
1077 GFP_KERNEL, DMA_FROM_DEVICE);
1078 if (!target->rx_ring[i])
1079 goto err;
1080 }
1081
1082 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1083 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1084 srp_max_iu_len,
1085 GFP_KERNEL, DMA_TO_DEVICE);
1086 if (!target->tx_ring[i])
1087 goto err;
1088 }
1089
1090 return 0;
1091
1092 err:
1093 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1094 srp_free_iu(target->srp_host, target->rx_ring[i]);
1095 target->rx_ring[i] = NULL;
1096 }
1097
1098 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1099 srp_free_iu(target->srp_host, target->tx_ring[i]);
1100 target->tx_ring[i] = NULL;
1101 }
1102
1103 return -ENOMEM;
1104 }
1105
1106 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1107 struct ib_cm_event *event,
1108 struct srp_target_port *target)
1109 {
1110 struct Scsi_Host *shost = target->scsi_host;
1111 struct ib_class_port_info *cpi;
1112 int opcode;
1113
1114 switch (event->param.rej_rcvd.reason) {
1115 case IB_CM_REJ_PORT_CM_REDIRECT:
1116 cpi = event->param.rej_rcvd.ari;
1117 target->path.dlid = cpi->redirect_lid;
1118 target->path.pkey = cpi->redirect_pkey;
1119 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1120 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1121
1122 target->status = target->path.dlid ?
1123 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1124 break;
1125
1126 case IB_CM_REJ_PORT_REDIRECT:
1127 if (srp_target_is_topspin(target)) {
1128 /*
1129 * Topspin/Cisco SRP gateways incorrectly send
1130 * reject reason code 25 when they mean 24
1131 * (port redirect).
1132 */
1133 memcpy(target->path.dgid.raw,
1134 event->param.rej_rcvd.ari, 16);
1135
1136 shost_printk(KERN_DEBUG, shost,
1137 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1138 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1139 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1140
1141 target->status = SRP_PORT_REDIRECT;
1142 } else {
1143 shost_printk(KERN_WARNING, shost,
1144 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1145 target->status = -ECONNRESET;
1146 }
1147 break;
1148
1149 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1150 shost_printk(KERN_WARNING, shost,
1151 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1152 target->status = -ECONNRESET;
1153 break;
1154
1155 case IB_CM_REJ_CONSUMER_DEFINED:
1156 opcode = *(u8 *) event->private_data;
1157 if (opcode == SRP_LOGIN_REJ) {
1158 struct srp_login_rej *rej = event->private_data;
1159 u32 reason = be32_to_cpu(rej->reason);
1160
1161 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1162 shost_printk(KERN_WARNING, shost,
1163 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1164 else
1165 shost_printk(KERN_WARNING, shost,
1166 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1167 } else
1168 shost_printk(KERN_WARNING, shost,
1169 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1170 " opcode 0x%02x\n", opcode);
1171 target->status = -ECONNRESET;
1172 break;
1173
1174 default:
1175 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1176 event->param.rej_rcvd.reason);
1177 target->status = -ECONNRESET;
1178 }
1179 }
1180
1181 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1182 {
1183 struct srp_target_port *target = cm_id->context;
1184 struct ib_qp_attr *qp_attr = NULL;
1185 int attr_mask = 0;
1186 int comp = 0;
1187 int opcode = 0;
1188
1189 switch (event->event) {
1190 case IB_CM_REQ_ERROR:
1191 shost_printk(KERN_DEBUG, target->scsi_host,
1192 PFX "Sending CM REQ failed\n");
1193 comp = 1;
1194 target->status = -ECONNRESET;
1195 break;
1196
1197 case IB_CM_REP_RECEIVED:
1198 comp = 1;
1199 opcode = *(u8 *) event->private_data;
1200
1201 if (opcode == SRP_LOGIN_RSP) {
1202 struct srp_login_rsp *rsp = event->private_data;
1203
1204 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1205 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1206
1207 target->scsi_host->can_queue = min(target->req_lim,
1208 target->scsi_host->can_queue);
1209 } else {
1210 shost_printk(KERN_WARNING, target->scsi_host,
1211 PFX "Unhandled RSP opcode %#x\n", opcode);
1212 target->status = -ECONNRESET;
1213 break;
1214 }
1215
1216 if (!target->rx_ring[0]) {
1217 target->status = srp_alloc_iu_bufs(target);
1218 if (target->status)
1219 break;
1220 }
1221
1222 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1223 if (!qp_attr) {
1224 target->status = -ENOMEM;
1225 break;
1226 }
1227
1228 qp_attr->qp_state = IB_QPS_RTR;
1229 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1230 if (target->status)
1231 break;
1232
1233 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1234 if (target->status)
1235 break;
1236
1237 target->status = srp_post_recv(target);
1238 if (target->status)
1239 break;
1240
1241 qp_attr->qp_state = IB_QPS_RTS;
1242 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1243 if (target->status)
1244 break;
1245
1246 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1247 if (target->status)
1248 break;
1249
1250 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1251 if (target->status)
1252 break;
1253
1254 break;
1255
1256 case IB_CM_REJ_RECEIVED:
1257 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1258 comp = 1;
1259
1260 srp_cm_rej_handler(cm_id, event, target);
1261 break;
1262
1263 case IB_CM_DREQ_RECEIVED:
1264 shost_printk(KERN_WARNING, target->scsi_host,
1265 PFX "DREQ received - connection closed\n");
1266 if (ib_send_cm_drep(cm_id, NULL, 0))
1267 shost_printk(KERN_ERR, target->scsi_host,
1268 PFX "Sending CM DREP failed\n");
1269 break;
1270
1271 case IB_CM_TIMEWAIT_EXIT:
1272 shost_printk(KERN_ERR, target->scsi_host,
1273 PFX "connection closed\n");
1274
1275 comp = 1;
1276 target->status = 0;
1277 break;
1278
1279 case IB_CM_MRA_RECEIVED:
1280 case IB_CM_DREQ_ERROR:
1281 case IB_CM_DREP_RECEIVED:
1282 break;
1283
1284 default:
1285 shost_printk(KERN_WARNING, target->scsi_host,
1286 PFX "Unhandled CM event %d\n", event->event);
1287 break;
1288 }
1289
1290 if (comp)
1291 complete(&target->done);
1292
1293 kfree(qp_attr);
1294
1295 return 0;
1296 }
1297
1298 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1299 struct srp_request *req, u8 func)
1300 {
1301 struct srp_iu *iu;
1302 struct srp_tsk_mgmt *tsk_mgmt;
1303
1304 spin_lock_irq(target->scsi_host->host_lock);
1305
1306 if (target->state == SRP_TARGET_DEAD ||
1307 target->state == SRP_TARGET_REMOVED) {
1308 req->scmnd->result = DID_BAD_TARGET << 16;
1309 goto out;
1310 }
1311
1312 init_completion(&req->done);
1313
1314 iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1315 if (!iu)
1316 goto out;
1317
1318 tsk_mgmt = iu->buf;
1319 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1320
1321 tsk_mgmt->opcode = SRP_TSK_MGMT;
1322 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1323 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1324 tsk_mgmt->tsk_mgmt_func = func;
1325 tsk_mgmt->task_tag = req->index;
1326
1327 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1328 goto out;
1329
1330 req->tsk_mgmt = iu;
1331
1332 spin_unlock_irq(target->scsi_host->host_lock);
1333
1334 if (!wait_for_completion_timeout(&req->done,
1335 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1336 return -1;
1337
1338 return 0;
1339
1340 out:
1341 spin_unlock_irq(target->scsi_host->host_lock);
1342 return -1;
1343 }
1344
1345 static int srp_find_req(struct srp_target_port *target,
1346 struct scsi_cmnd *scmnd,
1347 struct srp_request **req)
1348 {
1349 if (scmnd->host_scribble == (void *) -1L)
1350 return -1;
1351
1352 *req = &target->req_ring[(long) scmnd->host_scribble];
1353
1354 return 0;
1355 }
1356
1357 static int srp_abort(struct scsi_cmnd *scmnd)
1358 {
1359 struct srp_target_port *target = host_to_target(scmnd->device->host);
1360 struct srp_request *req;
1361 int ret = SUCCESS;
1362
1363 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1364
1365 if (target->qp_in_error)
1366 return FAILED;
1367 if (srp_find_req(target, scmnd, &req))
1368 return FAILED;
1369 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1370 return FAILED;
1371
1372 spin_lock_irq(target->scsi_host->host_lock);
1373
1374 if (req->cmd_done) {
1375 srp_remove_req(target, req);
1376 scmnd->scsi_done(scmnd);
1377 } else if (!req->tsk_status) {
1378 srp_remove_req(target, req);
1379 scmnd->result = DID_ABORT << 16;
1380 } else
1381 ret = FAILED;
1382
1383 spin_unlock_irq(target->scsi_host->host_lock);
1384
1385 return ret;
1386 }
1387
1388 static int srp_reset_device(struct scsi_cmnd *scmnd)
1389 {
1390 struct srp_target_port *target = host_to_target(scmnd->device->host);
1391 struct srp_request *req, *tmp;
1392
1393 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1394
1395 if (target->qp_in_error)
1396 return FAILED;
1397 if (srp_find_req(target, scmnd, &req))
1398 return FAILED;
1399 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1400 return FAILED;
1401 if (req->tsk_status)
1402 return FAILED;
1403
1404 spin_lock_irq(target->scsi_host->host_lock);
1405
1406 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1407 if (req->scmnd->device == scmnd->device)
1408 srp_reset_req(target, req);
1409
1410 spin_unlock_irq(target->scsi_host->host_lock);
1411
1412 return SUCCESS;
1413 }
1414
1415 static int srp_reset_host(struct scsi_cmnd *scmnd)
1416 {
1417 struct srp_target_port *target = host_to_target(scmnd->device->host);
1418 int ret = FAILED;
1419
1420 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1421
1422 if (!srp_reconnect_target(target))
1423 ret = SUCCESS;
1424
1425 return ret;
1426 }
1427
1428 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1429 {
1430 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1431
1432 if (target->state == SRP_TARGET_DEAD ||
1433 target->state == SRP_TARGET_REMOVED)
1434 return -ENODEV;
1435
1436 return sprintf(buf, "0x%016llx\n",
1437 (unsigned long long) be64_to_cpu(target->id_ext));
1438 }
1439
1440 static ssize_t show_ioc_guid(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, "0x%016llx\n",
1449 (unsigned long long) be64_to_cpu(target->ioc_guid));
1450 }
1451
1452 static ssize_t show_service_id(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, "0x%016llx\n",
1461 (unsigned long long) be64_to_cpu(target->service_id));
1462 }
1463
1464 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1465 {
1466 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1467
1468 if (target->state == SRP_TARGET_DEAD ||
1469 target->state == SRP_TARGET_REMOVED)
1470 return -ENODEV;
1471
1472 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1473 }
1474
1475 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1476 {
1477 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1478
1479 if (target->state == SRP_TARGET_DEAD ||
1480 target->state == SRP_TARGET_REMOVED)
1481 return -ENODEV;
1482
1483 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1484 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1485 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1486 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1487 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1488 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1489 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1490 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1491 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1492 }
1493
1494 static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
1495 {
1496 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1497
1498 if (target->state == SRP_TARGET_DEAD ||
1499 target->state == SRP_TARGET_REMOVED)
1500 return -ENODEV;
1501
1502 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1503 be16_to_cpu(target->orig_dgid[0]),
1504 be16_to_cpu(target->orig_dgid[1]),
1505 be16_to_cpu(target->orig_dgid[2]),
1506 be16_to_cpu(target->orig_dgid[3]),
1507 be16_to_cpu(target->orig_dgid[4]),
1508 be16_to_cpu(target->orig_dgid[5]),
1509 be16_to_cpu(target->orig_dgid[6]),
1510 be16_to_cpu(target->orig_dgid[7]));
1511 }
1512
1513 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1514 {
1515 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1516
1517 if (target->state == SRP_TARGET_DEAD ||
1518 target->state == SRP_TARGET_REMOVED)
1519 return -ENODEV;
1520
1521 return sprintf(buf, "%d\n", target->zero_req_lim);
1522 }
1523
1524 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1525 {
1526 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1527
1528 return sprintf(buf, "%d\n", target->srp_host->port);
1529 }
1530
1531 static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1532 {
1533 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1534
1535 return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1536 }
1537
1538 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1539 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1540 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1541 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1542 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1543 static CLASS_DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1544 static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1545 static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1546 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1547
1548 static struct class_device_attribute *srp_host_attrs[] = {
1549 &class_device_attr_id_ext,
1550 &class_device_attr_ioc_guid,
1551 &class_device_attr_service_id,
1552 &class_device_attr_pkey,
1553 &class_device_attr_dgid,
1554 &class_device_attr_orig_dgid,
1555 &class_device_attr_zero_req_lim,
1556 &class_device_attr_local_ib_port,
1557 &class_device_attr_local_ib_device,
1558 NULL
1559 };
1560
1561 static struct scsi_host_template srp_template = {
1562 .module = THIS_MODULE,
1563 .name = "InfiniBand SRP initiator",
1564 .proc_name = DRV_NAME,
1565 .info = srp_target_info,
1566 .queuecommand = srp_queuecommand,
1567 .eh_abort_handler = srp_abort,
1568 .eh_device_reset_handler = srp_reset_device,
1569 .eh_host_reset_handler = srp_reset_host,
1570 .can_queue = SRP_SQ_SIZE,
1571 .this_id = -1,
1572 .cmd_per_lun = SRP_SQ_SIZE,
1573 .use_clustering = ENABLE_CLUSTERING,
1574 .use_sg_chaining = ENABLE_SG_CHAINING,
1575 .shost_attrs = srp_host_attrs
1576 };
1577
1578 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1579 {
1580 struct srp_rport_identifiers ids;
1581 struct srp_rport *rport;
1582
1583 sprintf(target->target_name, "SRP.T10:%016llX",
1584 (unsigned long long) be64_to_cpu(target->id_ext));
1585
1586 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1587 return -ENODEV;
1588
1589 memcpy(ids.port_id, &target->id_ext, 8);
1590 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1591 ids.roles = SRP_RPORT_ROLE_TARGET;
1592 rport = srp_rport_add(target->scsi_host, &ids);
1593 if (IS_ERR(rport)) {
1594 scsi_remove_host(target->scsi_host);
1595 return PTR_ERR(rport);
1596 }
1597
1598 spin_lock(&host->target_lock);
1599 list_add_tail(&target->list, &host->target_list);
1600 spin_unlock(&host->target_lock);
1601
1602 target->state = SRP_TARGET_LIVE;
1603
1604 scsi_scan_target(&target->scsi_host->shost_gendev,
1605 0, target->scsi_id, SCAN_WILD_CARD, 0);
1606
1607 return 0;
1608 }
1609
1610 static void srp_release_class_dev(struct class_device *class_dev)
1611 {
1612 struct srp_host *host =
1613 container_of(class_dev, struct srp_host, class_dev);
1614
1615 complete(&host->released);
1616 }
1617
1618 static struct class srp_class = {
1619 .name = "infiniband_srp",
1620 .release = srp_release_class_dev
1621 };
1622
1623 /*
1624 * Target ports are added by writing
1625 *
1626 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1627 * pkey=<P_Key>,service_id=<service ID>
1628 *
1629 * to the add_target sysfs attribute.
1630 */
1631 enum {
1632 SRP_OPT_ERR = 0,
1633 SRP_OPT_ID_EXT = 1 << 0,
1634 SRP_OPT_IOC_GUID = 1 << 1,
1635 SRP_OPT_DGID = 1 << 2,
1636 SRP_OPT_PKEY = 1 << 3,
1637 SRP_OPT_SERVICE_ID = 1 << 4,
1638 SRP_OPT_MAX_SECT = 1 << 5,
1639 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1640 SRP_OPT_IO_CLASS = 1 << 7,
1641 SRP_OPT_INITIATOR_EXT = 1 << 8,
1642 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1643 SRP_OPT_IOC_GUID |
1644 SRP_OPT_DGID |
1645 SRP_OPT_PKEY |
1646 SRP_OPT_SERVICE_ID),
1647 };
1648
1649 static match_table_t srp_opt_tokens = {
1650 { SRP_OPT_ID_EXT, "id_ext=%s" },
1651 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1652 { SRP_OPT_DGID, "dgid=%s" },
1653 { SRP_OPT_PKEY, "pkey=%x" },
1654 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1655 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1656 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1657 { SRP_OPT_IO_CLASS, "io_class=%x" },
1658 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1659 { SRP_OPT_ERR, NULL }
1660 };
1661
1662 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1663 {
1664 char *options, *sep_opt;
1665 char *p;
1666 char dgid[3];
1667 substring_t args[MAX_OPT_ARGS];
1668 int opt_mask = 0;
1669 int token;
1670 int ret = -EINVAL;
1671 int i;
1672
1673 options = kstrdup(buf, GFP_KERNEL);
1674 if (!options)
1675 return -ENOMEM;
1676
1677 sep_opt = options;
1678 while ((p = strsep(&sep_opt, ",")) != NULL) {
1679 if (!*p)
1680 continue;
1681
1682 token = match_token(p, srp_opt_tokens, args);
1683 opt_mask |= token;
1684
1685 switch (token) {
1686 case SRP_OPT_ID_EXT:
1687 p = match_strdup(args);
1688 if (!p) {
1689 ret = -ENOMEM;
1690 goto out;
1691 }
1692 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1693 kfree(p);
1694 break;
1695
1696 case SRP_OPT_IOC_GUID:
1697 p = match_strdup(args);
1698 if (!p) {
1699 ret = -ENOMEM;
1700 goto out;
1701 }
1702 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1703 kfree(p);
1704 break;
1705
1706 case SRP_OPT_DGID:
1707 p = match_strdup(args);
1708 if (!p) {
1709 ret = -ENOMEM;
1710 goto out;
1711 }
1712 if (strlen(p) != 32) {
1713 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1714 kfree(p);
1715 goto out;
1716 }
1717
1718 for (i = 0; i < 16; ++i) {
1719 strlcpy(dgid, p + i * 2, 3);
1720 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1721 }
1722 kfree(p);
1723 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1724 break;
1725
1726 case SRP_OPT_PKEY:
1727 if (match_hex(args, &token)) {
1728 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1729 goto out;
1730 }
1731 target->path.pkey = cpu_to_be16(token);
1732 break;
1733
1734 case SRP_OPT_SERVICE_ID:
1735 p = match_strdup(args);
1736 if (!p) {
1737 ret = -ENOMEM;
1738 goto out;
1739 }
1740 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1741 target->path.service_id = target->service_id;
1742 kfree(p);
1743 break;
1744
1745 case SRP_OPT_MAX_SECT:
1746 if (match_int(args, &token)) {
1747 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1748 goto out;
1749 }
1750 target->scsi_host->max_sectors = token;
1751 break;
1752
1753 case SRP_OPT_MAX_CMD_PER_LUN:
1754 if (match_int(args, &token)) {
1755 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1756 goto out;
1757 }
1758 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1759 break;
1760
1761 case SRP_OPT_IO_CLASS:
1762 if (match_hex(args, &token)) {
1763 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1764 goto out;
1765 }
1766 if (token != SRP_REV10_IB_IO_CLASS &&
1767 token != SRP_REV16A_IB_IO_CLASS) {
1768 printk(KERN_WARNING PFX "unknown IO class parameter value"
1769 " %x specified (use %x or %x).\n",
1770 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1771 goto out;
1772 }
1773 target->io_class = token;
1774 break;
1775
1776 case SRP_OPT_INITIATOR_EXT:
1777 p = match_strdup(args);
1778 if (!p) {
1779 ret = -ENOMEM;
1780 goto out;
1781 }
1782 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1783 kfree(p);
1784 break;
1785
1786 default:
1787 printk(KERN_WARNING PFX "unknown parameter or missing value "
1788 "'%s' in target creation request\n", p);
1789 goto out;
1790 }
1791 }
1792
1793 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1794 ret = 0;
1795 else
1796 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1797 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1798 !(srp_opt_tokens[i].token & opt_mask))
1799 printk(KERN_WARNING PFX "target creation request is "
1800 "missing parameter '%s'\n",
1801 srp_opt_tokens[i].pattern);
1802
1803 out:
1804 kfree(options);
1805 return ret;
1806 }
1807
1808 static ssize_t srp_create_target(struct class_device *class_dev,
1809 const char *buf, size_t count)
1810 {
1811 struct srp_host *host =
1812 container_of(class_dev, struct srp_host, class_dev);
1813 struct Scsi_Host *target_host;
1814 struct srp_target_port *target;
1815 int ret;
1816 int i;
1817
1818 target_host = scsi_host_alloc(&srp_template,
1819 sizeof (struct srp_target_port));
1820 if (!target_host)
1821 return -ENOMEM;
1822
1823 target_host->transportt = ib_srp_transport_template;
1824 target_host->max_lun = SRP_MAX_LUN;
1825 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1826
1827 target = host_to_target(target_host);
1828
1829 target->io_class = SRP_REV16A_IB_IO_CLASS;
1830 target->scsi_host = target_host;
1831 target->srp_host = host;
1832
1833 INIT_LIST_HEAD(&target->free_reqs);
1834 INIT_LIST_HEAD(&target->req_queue);
1835 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1836 target->req_ring[i].index = i;
1837 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1838 }
1839
1840 ret = srp_parse_options(buf, target);
1841 if (ret)
1842 goto err;
1843
1844 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1845
1846 shost_printk(KERN_DEBUG, target->scsi_host, PFX
1847 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1848 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1849 (unsigned long long) be64_to_cpu(target->id_ext),
1850 (unsigned long long) be64_to_cpu(target->ioc_guid),
1851 be16_to_cpu(target->path.pkey),
1852 (unsigned long long) be64_to_cpu(target->service_id),
1853 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1854 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1855 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1856 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1857 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1858 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1859 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1860 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1861
1862 ret = srp_create_target_ib(target);
1863 if (ret)
1864 goto err;
1865
1866 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1867 if (IS_ERR(target->cm_id)) {
1868 ret = PTR_ERR(target->cm_id);
1869 goto err_free;
1870 }
1871
1872 target->qp_in_error = 0;
1873 ret = srp_connect_target(target);
1874 if (ret) {
1875 shost_printk(KERN_ERR, target->scsi_host,
1876 PFX "Connection failed\n");
1877 goto err_cm_id;
1878 }
1879
1880 ret = srp_add_target(host, target);
1881 if (ret)
1882 goto err_disconnect;
1883
1884 return count;
1885
1886 err_disconnect:
1887 srp_disconnect_target(target);
1888
1889 err_cm_id:
1890 ib_destroy_cm_id(target->cm_id);
1891
1892 err_free:
1893 srp_free_target_ib(target);
1894
1895 err:
1896 scsi_host_put(target_host);
1897
1898 return ret;
1899 }
1900
1901 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1902
1903 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1904 {
1905 struct srp_host *host =
1906 container_of(class_dev, struct srp_host, class_dev);
1907
1908 return sprintf(buf, "%s\n", host->dev->dev->name);
1909 }
1910
1911 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1912
1913 static ssize_t show_port(struct class_device *class_dev, char *buf)
1914 {
1915 struct srp_host *host =
1916 container_of(class_dev, struct srp_host, class_dev);
1917
1918 return sprintf(buf, "%d\n", host->port);
1919 }
1920
1921 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1922
1923 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1924 {
1925 struct srp_host *host;
1926
1927 host = kzalloc(sizeof *host, GFP_KERNEL);
1928 if (!host)
1929 return NULL;
1930
1931 INIT_LIST_HEAD(&host->target_list);
1932 spin_lock_init(&host->target_lock);
1933 init_completion(&host->released);
1934 host->dev = device;
1935 host->port = port;
1936
1937 host->class_dev.class = &srp_class;
1938 host->class_dev.dev = device->dev->dma_device;
1939 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1940 device->dev->name, port);
1941
1942 if (class_device_register(&host->class_dev))
1943 goto free_host;
1944 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1945 goto err_class;
1946 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1947 goto err_class;
1948 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1949 goto err_class;
1950
1951 return host;
1952
1953 err_class:
1954 class_device_unregister(&host->class_dev);
1955
1956 free_host:
1957 kfree(host);
1958
1959 return NULL;
1960 }
1961
1962 static void srp_add_one(struct ib_device *device)
1963 {
1964 struct srp_device *srp_dev;
1965 struct ib_device_attr *dev_attr;
1966 struct ib_fmr_pool_param fmr_param;
1967 struct srp_host *host;
1968 int s, e, p;
1969
1970 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1971 if (!dev_attr)
1972 return;
1973
1974 if (ib_query_device(device, dev_attr)) {
1975 printk(KERN_WARNING PFX "Query device failed for %s\n",
1976 device->name);
1977 goto free_attr;
1978 }
1979
1980 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1981 if (!srp_dev)
1982 goto free_attr;
1983
1984 /*
1985 * Use the smallest page size supported by the HCA, down to a
1986 * minimum of 512 bytes (which is the smallest sector that a
1987 * SCSI command will ever carry).
1988 */
1989 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1990 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
1991 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
1992
1993 INIT_LIST_HEAD(&srp_dev->dev_list);
1994
1995 srp_dev->dev = device;
1996 srp_dev->pd = ib_alloc_pd(device);
1997 if (IS_ERR(srp_dev->pd))
1998 goto free_dev;
1999
2000 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2001 IB_ACCESS_LOCAL_WRITE |
2002 IB_ACCESS_REMOTE_READ |
2003 IB_ACCESS_REMOTE_WRITE);
2004 if (IS_ERR(srp_dev->mr))
2005 goto err_pd;
2006
2007 memset(&fmr_param, 0, sizeof fmr_param);
2008 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2009 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2010 fmr_param.cache = 1;
2011 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2012 fmr_param.page_shift = srp_dev->fmr_page_shift;
2013 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2014 IB_ACCESS_REMOTE_WRITE |
2015 IB_ACCESS_REMOTE_READ);
2016
2017 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2018 if (IS_ERR(srp_dev->fmr_pool))
2019 srp_dev->fmr_pool = NULL;
2020
2021 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2022 s = 0;
2023 e = 0;
2024 } else {
2025 s = 1;
2026 e = device->phys_port_cnt;
2027 }
2028
2029 for (p = s; p <= e; ++p) {
2030 host = srp_add_port(srp_dev, p);
2031 if (host)
2032 list_add_tail(&host->list, &srp_dev->dev_list);
2033 }
2034
2035 ib_set_client_data(device, &srp_client, srp_dev);
2036
2037 goto free_attr;
2038
2039 err_pd:
2040 ib_dealloc_pd(srp_dev->pd);
2041
2042 free_dev:
2043 kfree(srp_dev);
2044
2045 free_attr:
2046 kfree(dev_attr);
2047 }
2048
2049 static void srp_remove_one(struct ib_device *device)
2050 {
2051 struct srp_device *srp_dev;
2052 struct srp_host *host, *tmp_host;
2053 LIST_HEAD(target_list);
2054 struct srp_target_port *target, *tmp_target;
2055
2056 srp_dev = ib_get_client_data(device, &srp_client);
2057
2058 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2059 class_device_unregister(&host->class_dev);
2060 /*
2061 * Wait for the sysfs entry to go away, so that no new
2062 * target ports can be created.
2063 */
2064 wait_for_completion(&host->released);
2065
2066 /*
2067 * Mark all target ports as removed, so we stop queueing
2068 * commands and don't try to reconnect.
2069 */
2070 spin_lock(&host->target_lock);
2071 list_for_each_entry(target, &host->target_list, list) {
2072 spin_lock_irq(target->scsi_host->host_lock);
2073 target->state = SRP_TARGET_REMOVED;
2074 spin_unlock_irq(target->scsi_host->host_lock);
2075 }
2076 spin_unlock(&host->target_lock);
2077
2078 /*
2079 * Wait for any reconnection tasks that may have
2080 * started before we marked our target ports as
2081 * removed, and any target port removal tasks.
2082 */
2083 flush_scheduled_work();
2084
2085 list_for_each_entry_safe(target, tmp_target,
2086 &host->target_list, list) {
2087 srp_remove_host(target->scsi_host);
2088 scsi_remove_host(target->scsi_host);
2089 srp_disconnect_target(target);
2090 ib_destroy_cm_id(target->cm_id);
2091 srp_free_target_ib(target);
2092 scsi_host_put(target->scsi_host);
2093 }
2094
2095 kfree(host);
2096 }
2097
2098 if (srp_dev->fmr_pool)
2099 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2100 ib_dereg_mr(srp_dev->mr);
2101 ib_dealloc_pd(srp_dev->pd);
2102
2103 kfree(srp_dev);
2104 }
2105
2106 static struct srp_function_template ib_srp_transport_functions = {
2107 };
2108
2109 static int __init srp_init_module(void)
2110 {
2111 int ret;
2112
2113 ib_srp_transport_template =
2114 srp_attach_transport(&ib_srp_transport_functions);
2115 if (!ib_srp_transport_template)
2116 return -ENOMEM;
2117
2118 srp_template.sg_tablesize = srp_sg_tablesize;
2119 srp_max_iu_len = (sizeof (struct srp_cmd) +
2120 sizeof (struct srp_indirect_buf) +
2121 srp_sg_tablesize * 16);
2122
2123 ret = class_register(&srp_class);
2124 if (ret) {
2125 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2126 srp_release_transport(ib_srp_transport_template);
2127 return ret;
2128 }
2129
2130 ib_sa_register_client(&srp_sa_client);
2131
2132 ret = ib_register_client(&srp_client);
2133 if (ret) {
2134 printk(KERN_ERR PFX "couldn't register IB client\n");
2135 srp_release_transport(ib_srp_transport_template);
2136 ib_sa_unregister_client(&srp_sa_client);
2137 class_unregister(&srp_class);
2138 return ret;
2139 }
2140
2141 return 0;
2142 }
2143
2144 static void __exit srp_cleanup_module(void)
2145 {
2146 ib_unregister_client(&srp_client);
2147 ib_sa_unregister_client(&srp_sa_client);
2148 class_unregister(&srp_class);
2149 srp_release_transport(ib_srp_transport_template);
2150 }
2151
2152 module_init(srp_init_module);
2153 module_exit(srp_cleanup_module);
WRT350N Kernel Patches