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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / infiniband / ulp / srp / ib_srp.c
blobfd4a49fc4773eecb1bcf8d714c29cb83479eb963
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_new_cm_id(struct srp_target_port *target)
208 {
209 struct ib_cm_id *new_cm_id;
210
211 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
212 srp_cm_handler, target);
213 if (IS_ERR(new_cm_id))
214 return PTR_ERR(new_cm_id);
215
216 if (target->cm_id)
217 ib_destroy_cm_id(target->cm_id);
218 target->cm_id = new_cm_id;
219
220 return 0;
221 }
222
223 static int srp_create_target_ib(struct srp_target_port *target)
224 {
225 struct ib_qp_init_attr *init_attr;
226 int ret;
227
228 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
229 if (!init_attr)
230 return -ENOMEM;
231
232 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
233 NULL, target, SRP_CQ_SIZE, 0);
234 if (IS_ERR(target->cq)) {
235 ret = PTR_ERR(target->cq);
236 goto out;
237 }
238
239 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
240
241 init_attr->event_handler = srp_qp_event;
242 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
243 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
244 init_attr->cap.max_recv_sge = 1;
245 init_attr->cap.max_send_sge = 1;
246 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
247 init_attr->qp_type = IB_QPT_RC;
248 init_attr->send_cq = target->cq;
249 init_attr->recv_cq = target->cq;
250
251 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
252 if (IS_ERR(target->qp)) {
253 ret = PTR_ERR(target->qp);
254 ib_destroy_cq(target->cq);
255 goto out;
256 }
257
258 ret = srp_init_qp(target, target->qp);
259 if (ret) {
260 ib_destroy_qp(target->qp);
261 ib_destroy_cq(target->cq);
262 goto out;
263 }
264
265 out:
266 kfree(init_attr);
267 return ret;
268 }
269
270 static void srp_free_target_ib(struct srp_target_port *target)
271 {
272 int i;
273
274 ib_destroy_qp(target->qp);
275 ib_destroy_cq(target->cq);
276
277 for (i = 0; i < SRP_RQ_SIZE; ++i)
278 srp_free_iu(target->srp_host, target->rx_ring[i]);
279 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
280 srp_free_iu(target->srp_host, target->tx_ring[i]);
281 }
282
283 static void srp_path_rec_completion(int status,
284 struct ib_sa_path_rec *pathrec,
285 void *target_ptr)
286 {
287 struct srp_target_port *target = target_ptr;
288
289 target->status = status;
290 if (status)
291 shost_printk(KERN_ERR, target->scsi_host,
292 PFX "Got failed path rec status %d\n", status);
293 else
294 target->path = *pathrec;
295 complete(&target->done);
296 }
297
298 static int srp_lookup_path(struct srp_target_port *target)
299 {
300 target->path.numb_path = 1;
301
302 init_completion(&target->done);
303
304 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
305 target->srp_host->dev->dev,
306 target->srp_host->port,
307 &target->path,
308 IB_SA_PATH_REC_SERVICE_ID |
309 IB_SA_PATH_REC_DGID |
310 IB_SA_PATH_REC_SGID |
311 IB_SA_PATH_REC_NUMB_PATH |
312 IB_SA_PATH_REC_PKEY,
313 SRP_PATH_REC_TIMEOUT_MS,
314 GFP_KERNEL,
315 srp_path_rec_completion,
316 target, &target->path_query);
317 if (target->path_query_id < 0)
318 return target->path_query_id;
319
320 wait_for_completion(&target->done);
321
322 if (target->status < 0)
323 shost_printk(KERN_WARNING, target->scsi_host,
324 PFX "Path record query failed\n");
325
326 return target->status;
327 }
328
329 static int srp_send_req(struct srp_target_port *target)
330 {
331 struct {
332 struct ib_cm_req_param param;
333 struct srp_login_req priv;
334 } *req = NULL;
335 int status;
336
337 req = kzalloc(sizeof *req, GFP_KERNEL);
338 if (!req)
339 return -ENOMEM;
340
341 req->param.primary_path = &target->path;
342 req->param.alternate_path = NULL;
343 req->param.service_id = target->service_id;
344 req->param.qp_num = target->qp->qp_num;
345 req->param.qp_type = target->qp->qp_type;
346 req->param.private_data = &req->priv;
347 req->param.private_data_len = sizeof req->priv;
348 req->param.flow_control = 1;
349
350 get_random_bytes(&req->param.starting_psn, 4);
351 req->param.starting_psn &= 0xffffff;
352
353 /*
354 * Pick some arbitrary defaults here; we could make these
355 * module parameters if anyone cared about setting them.
356 */
357 req->param.responder_resources = 4;
358 req->param.remote_cm_response_timeout = 20;
359 req->param.local_cm_response_timeout = 20;
360 req->param.retry_count = 7;
361 req->param.rnr_retry_count = 7;
362 req->param.max_cm_retries = 15;
363
364 req->priv.opcode = SRP_LOGIN_REQ;
365 req->priv.tag = 0;
366 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
367 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
368 SRP_BUF_FORMAT_INDIRECT);
369 /*
370 * In the published SRP specification (draft rev. 16a), the
371 * port identifier format is 8 bytes of ID extension followed
372 * by 8 bytes of GUID. Older drafts put the two halves in the
373 * opposite order, so that the GUID comes first.
374 *
375 * Targets conforming to these obsolete drafts can be
376 * recognized by the I/O Class they report.
377 */
378 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
379 memcpy(req->priv.initiator_port_id,
380 &target->path.sgid.global.interface_id, 8);
381 memcpy(req->priv.initiator_port_id + 8,
382 &target->initiator_ext, 8);
383 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
384 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
385 } else {
386 memcpy(req->priv.initiator_port_id,
387 &target->initiator_ext, 8);
388 memcpy(req->priv.initiator_port_id + 8,
389 &target->path.sgid.global.interface_id, 8);
390 memcpy(req->priv.target_port_id, &target->id_ext, 8);
391 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
392 }
393
394 /*
395 * Topspin/Cisco SRP targets will reject our login unless we
396 * zero out the first 8 bytes of our initiator port ID and set
397 * the second 8 bytes to the local node GUID.
398 */
399 if (srp_target_is_topspin(target)) {
400 shost_printk(KERN_DEBUG, target->scsi_host,
401 PFX "Topspin/Cisco initiator port ID workaround "
402 "activated for target GUID %016llx\n",
403 (unsigned long long) be64_to_cpu(target->ioc_guid));
404 memset(req->priv.initiator_port_id, 0, 8);
405 memcpy(req->priv.initiator_port_id + 8,
406 &target->srp_host->dev->dev->node_guid, 8);
407 }
408
409 status = ib_send_cm_req(target->cm_id, &req->param);
410
411 kfree(req);
412
413 return status;
414 }
415
416 static void srp_disconnect_target(struct srp_target_port *target)
417 {
418 /* XXX should send SRP_I_LOGOUT request */
419
420 init_completion(&target->done);
421 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
422 shost_printk(KERN_DEBUG, target->scsi_host,
423 PFX "Sending CM DREQ failed\n");
424 return;
425 }
426 wait_for_completion(&target->done);
427 }
428
429 static void srp_remove_work(struct work_struct *work)
430 {
431 struct srp_target_port *target =
432 container_of(work, struct srp_target_port, work);
433
434 spin_lock_irq(target->scsi_host->host_lock);
435 if (target->state != SRP_TARGET_DEAD) {
436 spin_unlock_irq(target->scsi_host->host_lock);
437 return;
438 }
439 target->state = SRP_TARGET_REMOVED;
440 spin_unlock_irq(target->scsi_host->host_lock);
441
442 spin_lock(&target->srp_host->target_lock);
443 list_del(&target->list);
444 spin_unlock(&target->srp_host->target_lock);
445
446 srp_remove_host(target->scsi_host);
447 scsi_remove_host(target->scsi_host);
448 ib_destroy_cm_id(target->cm_id);
449 srp_free_target_ib(target);
450 scsi_host_put(target->scsi_host);
451 }
452
453 static int srp_connect_target(struct srp_target_port *target)
454 {
455 int retries = 3;
456 int ret;
457
458 ret = srp_lookup_path(target);
459 if (ret)
460 return ret;
461
462 while (1) {
463 init_completion(&target->done);
464 ret = srp_send_req(target);
465 if (ret)
466 return ret;
467 wait_for_completion(&target->done);
468
469 /*
470 * The CM event handling code will set status to
471 * SRP_PORT_REDIRECT if we get a port redirect REJ
472 * back, or SRP_DLID_REDIRECT if we get a lid/qp
473 * redirect REJ back.
474 */
475 switch (target->status) {
476 case 0:
477 return 0;
478
479 case SRP_PORT_REDIRECT:
480 ret = srp_lookup_path(target);
481 if (ret)
482 return ret;
483 break;
484
485 case SRP_DLID_REDIRECT:
486 break;
487
488 case SRP_STALE_CONN:
489 /* Our current CM id was stale, and is now in timewait.
490 * Try to reconnect with a new one.
491 */
492 if (!retries-- || srp_new_cm_id(target)) {
493 shost_printk(KERN_ERR, target->scsi_host, PFX
494 "giving up on stale connection\n");
495 target->status = -ECONNRESET;
496 return target->status;
497 }
498
499 shost_printk(KERN_ERR, target->scsi_host, PFX
500 "retrying stale connection\n");
501 break;
502
503 default:
504 return target->status;
505 }
506 }
507 }
508
509 static void srp_unmap_data(struct scsi_cmnd *scmnd,
510 struct srp_target_port *target,
511 struct srp_request *req)
512 {
513 if (!scsi_sglist(scmnd) ||
514 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
515 scmnd->sc_data_direction != DMA_FROM_DEVICE))
516 return;
517
518 if (req->fmr) {
519 ib_fmr_pool_unmap(req->fmr);
520 req->fmr = NULL;
521 }
522
523 ib_dma_unmap_sg(target->srp_host->dev->dev, scsi_sglist(scmnd),
524 scsi_sg_count(scmnd), scmnd->sc_data_direction);
525 }
526
527 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
528 {
529 srp_unmap_data(req->scmnd, target, req);
530 list_move_tail(&req->list, &target->free_reqs);
531 }
532
533 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
534 {
535 req->scmnd->result = DID_RESET << 16;
536 req->scmnd->scsi_done(req->scmnd);
537 srp_remove_req(target, req);
538 }
539
540 static int srp_reconnect_target(struct srp_target_port *target)
541 {
542 struct ib_qp_attr qp_attr;
543 struct srp_request *req, *tmp;
544 struct ib_wc wc;
545 int ret;
546
547 spin_lock_irq(target->scsi_host->host_lock);
548 if (target->state != SRP_TARGET_LIVE) {
549 spin_unlock_irq(target->scsi_host->host_lock);
550 return -EAGAIN;
551 }
552 target->state = SRP_TARGET_CONNECTING;
553 spin_unlock_irq(target->scsi_host->host_lock);
554
555 srp_disconnect_target(target);
556 /*
557 * Now get a new local CM ID so that we avoid confusing the
558 * target in case things are really fouled up.
559 */
560 ret = srp_new_cm_id(target);
561 if (ret)
562 goto err;
563
564 qp_attr.qp_state = IB_QPS_RESET;
565 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
566 if (ret)
567 goto err;
568
569 ret = srp_init_qp(target, target->qp);
570 if (ret)
571 goto err;
572
573 while (ib_poll_cq(target->cq, 1, &wc) > 0)
574 ; /* nothing */
575
576 spin_lock_irq(target->scsi_host->host_lock);
577 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
578 srp_reset_req(target, req);
579 spin_unlock_irq(target->scsi_host->host_lock);
580
581 target->rx_head = 0;
582 target->tx_head = 0;
583 target->tx_tail = 0;
584
585 target->qp_in_error = 0;
586 ret = srp_connect_target(target);
587 if (ret)
588 goto err;
589
590 spin_lock_irq(target->scsi_host->host_lock);
591 if (target->state == SRP_TARGET_CONNECTING) {
592 ret = 0;
593 target->state = SRP_TARGET_LIVE;
594 } else
595 ret = -EAGAIN;
596 spin_unlock_irq(target->scsi_host->host_lock);
597
598 return ret;
599
600 err:
601 shost_printk(KERN_ERR, target->scsi_host,
602 PFX "reconnect failed (%d), removing target port.\n", ret);
603
604 /*
605 * We couldn't reconnect, so kill our target port off.
606 * However, we have to defer the real removal because we might
607 * be in the context of the SCSI error handler now, which
608 * would deadlock if we call scsi_remove_host().
609 */
610 spin_lock_irq(target->scsi_host->host_lock);
611 if (target->state == SRP_TARGET_CONNECTING) {
612 target->state = SRP_TARGET_DEAD;
613 INIT_WORK(&target->work, srp_remove_work);
614 schedule_work(&target->work);
615 }
616 spin_unlock_irq(target->scsi_host->host_lock);
617
618 return ret;
619 }
620
621 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
622 int sg_cnt, struct srp_request *req,
623 struct srp_direct_buf *buf)
624 {
625 u64 io_addr = 0;
626 u64 *dma_pages;
627 u32 len;
628 int page_cnt;
629 int i, j;
630 int ret;
631 struct srp_device *dev = target->srp_host->dev;
632 struct ib_device *ibdev = dev->dev;
633 struct scatterlist *sg;
634
635 if (!dev->fmr_pool)
636 return -ENODEV;
637
638 if (srp_target_is_mellanox(target) &&
639 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
640 return -EINVAL;
641
642 len = page_cnt = 0;
643 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
644 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
645
646 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
647 if (i > 0)
648 return -EINVAL;
649 else
650 ++page_cnt;
651 }
652 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
653 ~dev->fmr_page_mask) {
654 if (i < sg_cnt - 1)
655 return -EINVAL;
656 else
657 ++page_cnt;
658 }
659
660 len += dma_len;
661 }
662
663 page_cnt += len >> dev->fmr_page_shift;
664 if (page_cnt > SRP_FMR_SIZE)
665 return -ENOMEM;
666
667 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
668 if (!dma_pages)
669 return -ENOMEM;
670
671 page_cnt = 0;
672 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
673 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
674
675 for (j = 0; j < dma_len; j += dev->fmr_page_size)
676 dma_pages[page_cnt++] =
677 (ib_sg_dma_address(ibdev, sg) &
678 dev->fmr_page_mask) + j;
679 }
680
681 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
682 dma_pages, page_cnt, io_addr);
683 if (IS_ERR(req->fmr)) {
684 ret = PTR_ERR(req->fmr);
685 req->fmr = NULL;
686 goto out;
687 }
688
689 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
690 ~dev->fmr_page_mask);
691 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
692 buf->len = cpu_to_be32(len);
693
694 ret = 0;
695
696 out:
697 kfree(dma_pages);
698
699 return ret;
700 }
701
702 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
703 struct srp_request *req)
704 {
705 struct scatterlist *scat;
706 struct srp_cmd *cmd = req->cmd->buf;
707 int len, nents, count;
708 u8 fmt = SRP_DATA_DESC_DIRECT;
709 struct srp_device *dev;
710 struct ib_device *ibdev;
711
712 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
713 return sizeof (struct srp_cmd);
714
715 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
716 scmnd->sc_data_direction != DMA_TO_DEVICE) {
717 shost_printk(KERN_WARNING, target->scsi_host,
718 PFX "Unhandled data direction %d\n",
719 scmnd->sc_data_direction);
720 return -EINVAL;
721 }
722
723 nents = scsi_sg_count(scmnd);
724 scat = scsi_sglist(scmnd);
725
726 dev = target->srp_host->dev;
727 ibdev = dev->dev;
728
729 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
730
731 fmt = SRP_DATA_DESC_DIRECT;
732 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
733
734 if (count == 1) {
735 /*
736 * The midlayer only generated a single gather/scatter
737 * entry, or DMA mapping coalesced everything to a
738 * single entry. So a direct descriptor along with
739 * the DMA MR suffices.
740 */
741 struct srp_direct_buf *buf = (void *) cmd->add_data;
742
743 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
744 buf->key = cpu_to_be32(dev->mr->rkey);
745 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
746 } else if (srp_map_fmr(target, scat, count, req,
747 (void *) cmd->add_data)) {
748 /*
749 * FMR mapping failed, and the scatterlist has more
750 * than one entry. Generate an indirect memory
751 * descriptor.
752 */
753 struct srp_indirect_buf *buf = (void *) cmd->add_data;
754 struct scatterlist *sg;
755 u32 datalen = 0;
756 int i;
757
758 fmt = SRP_DATA_DESC_INDIRECT;
759 len = sizeof (struct srp_cmd) +
760 sizeof (struct srp_indirect_buf) +
761 count * sizeof (struct srp_direct_buf);
762
763 scsi_for_each_sg(scmnd, sg, count, i) {
764 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
765
766 buf->desc_list[i].va =
767 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
768 buf->desc_list[i].key =
769 cpu_to_be32(dev->mr->rkey);
770 buf->desc_list[i].len = cpu_to_be32(dma_len);
771 datalen += dma_len;
772 }
773
774 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
775 cmd->data_out_desc_cnt = count;
776 else
777 cmd->data_in_desc_cnt = count;
778
779 buf->table_desc.va =
780 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
781 buf->table_desc.key =
782 cpu_to_be32(target->srp_host->dev->mr->rkey);
783 buf->table_desc.len =
784 cpu_to_be32(count * sizeof (struct srp_direct_buf));
785
786 buf->len = cpu_to_be32(datalen);
787 }
788
789 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
790 cmd->buf_fmt = fmt << 4;
791 else
792 cmd->buf_fmt = fmt;
793
794 return len;
795 }
796
797 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
798 {
799 struct srp_request *req;
800 struct scsi_cmnd *scmnd;
801 unsigned long flags;
802 s32 delta;
803
804 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
805
806 spin_lock_irqsave(target->scsi_host->host_lock, flags);
807
808 target->req_lim += delta;
809
810 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
811
812 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
813 if (be32_to_cpu(rsp->resp_data_len) < 4)
814 req->tsk_status = -1;
815 else
816 req->tsk_status = rsp->data[3];
817 complete(&req->done);
818 } else {
819 scmnd = req->scmnd;
820 if (!scmnd)
821 shost_printk(KERN_ERR, target->scsi_host,
822 "Null scmnd for RSP w/tag %016llx\n",
823 (unsigned long long) rsp->tag);
824 scmnd->result = rsp->status;
825
826 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
827 memcpy(scmnd->sense_buffer, rsp->data +
828 be32_to_cpu(rsp->resp_data_len),
829 min_t(int, be32_to_cpu(rsp->sense_data_len),
830 SCSI_SENSE_BUFFERSIZE));
831 }
832
833 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
834 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
835 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
836 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
837
838 if (!req->tsk_mgmt) {
839 scmnd->host_scribble = (void *) -1L;
840 scmnd->scsi_done(scmnd);
841
842 srp_remove_req(target, req);
843 } else
844 req->cmd_done = 1;
845 }
846
847 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
848 }
849
850 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
851 {
852 struct ib_device *dev;
853 struct srp_iu *iu;
854 u8 opcode;
855
856 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
857
858 dev = target->srp_host->dev->dev;
859 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
860 DMA_FROM_DEVICE);
861
862 opcode = *(u8 *) iu->buf;
863
864 if (0) {
865 int i;
866
867 shost_printk(KERN_ERR, target->scsi_host,
868 PFX "recv completion, opcode 0x%02x\n", opcode);
869
870 for (i = 0; i < wc->byte_len; ++i) {
871 if (i % 8 == 0)
872 printk(KERN_ERR " [%02x] ", i);
873 printk(" %02x", ((u8 *) iu->buf)[i]);
874 if ((i + 1) % 8 == 0)
875 printk("\n");
876 }
877
878 if (wc->byte_len % 8)
879 printk("\n");
880 }
881
882 switch (opcode) {
883 case SRP_RSP:
884 srp_process_rsp(target, iu->buf);
885 break;
886
887 case SRP_T_LOGOUT:
888 /* XXX Handle target logout */
889 shost_printk(KERN_WARNING, target->scsi_host,
890 PFX "Got target logout request\n");
891 break;
892
893 default:
894 shost_printk(KERN_WARNING, target->scsi_host,
895 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
896 break;
897 }
898
899 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
900 DMA_FROM_DEVICE);
901 }
902
903 static void srp_completion(struct ib_cq *cq, void *target_ptr)
904 {
905 struct srp_target_port *target = target_ptr;
906 struct ib_wc wc;
907
908 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
909 while (ib_poll_cq(cq, 1, &wc) > 0) {
910 if (wc.status) {
911 shost_printk(KERN_ERR, target->scsi_host,
912 PFX "failed %s status %d\n",
913 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
914 wc.status);
915 target->qp_in_error = 1;
916 break;
917 }
918
919 if (wc.wr_id & SRP_OP_RECV)
920 srp_handle_recv(target, &wc);
921 else
922 ++target->tx_tail;
923 }
924 }
925
926 static int __srp_post_recv(struct srp_target_port *target)
927 {
928 struct srp_iu *iu;
929 struct ib_sge list;
930 struct ib_recv_wr wr, *bad_wr;
931 unsigned int next;
932 int ret;
933
934 next = target->rx_head & (SRP_RQ_SIZE - 1);
935 wr.wr_id = next | SRP_OP_RECV;
936 iu = target->rx_ring[next];
937
938 list.addr = iu->dma;
939 list.length = iu->size;
940 list.lkey = target->srp_host->dev->mr->lkey;
941
942 wr.next = NULL;
943 wr.sg_list = &list;
944 wr.num_sge = 1;
945
946 ret = ib_post_recv(target->qp, &wr, &bad_wr);
947 if (!ret)
948 ++target->rx_head;
949
950 return ret;
951 }
952
953 static int srp_post_recv(struct srp_target_port *target)
954 {
955 unsigned long flags;
956 int ret;
957
958 spin_lock_irqsave(target->scsi_host->host_lock, flags);
959 ret = __srp_post_recv(target);
960 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
961
962 return ret;
963 }
964
965 /*
966 * Must be called with target->scsi_host->host_lock held to protect
967 * req_lim and tx_head. Lock cannot be dropped between call here and
968 * call to __srp_post_send().
969 */
970 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
971 enum srp_request_type req_type)
972 {
973 s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
974
975 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
976 return NULL;
977
978 if (target->req_lim < min) {
979 ++target->zero_req_lim;
980 return NULL;
981 }
982
983 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
984 }
985
986 /*
987 * Must be called with target->scsi_host->host_lock held to protect
988 * req_lim and tx_head.
989 */
990 static int __srp_post_send(struct srp_target_port *target,
991 struct srp_iu *iu, int len)
992 {
993 struct ib_sge list;
994 struct ib_send_wr wr, *bad_wr;
995 int ret = 0;
996
997 list.addr = iu->dma;
998 list.length = len;
999 list.lkey = target->srp_host->dev->mr->lkey;
1000
1001 wr.next = NULL;
1002 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
1003 wr.sg_list = &list;
1004 wr.num_sge = 1;
1005 wr.opcode = IB_WR_SEND;
1006 wr.send_flags = IB_SEND_SIGNALED;
1007
1008 ret = ib_post_send(target->qp, &wr, &bad_wr);
1009
1010 if (!ret) {
1011 ++target->tx_head;
1012 --target->req_lim;
1013 }
1014
1015 return ret;
1016 }
1017
1018 static int srp_queuecommand(struct scsi_cmnd *scmnd,
1019 void (*done)(struct scsi_cmnd *))
1020 {
1021 struct srp_target_port *target = host_to_target(scmnd->device->host);
1022 struct srp_request *req;
1023 struct srp_iu *iu;
1024 struct srp_cmd *cmd;
1025 struct ib_device *dev;
1026 int len;
1027
1028 if (target->state == SRP_TARGET_CONNECTING)
1029 goto err;
1030
1031 if (target->state == SRP_TARGET_DEAD ||
1032 target->state == SRP_TARGET_REMOVED) {
1033 scmnd->result = DID_BAD_TARGET << 16;
1034 done(scmnd);
1035 return 0;
1036 }
1037
1038 iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1039 if (!iu)
1040 goto err;
1041
1042 dev = target->srp_host->dev->dev;
1043 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1044 DMA_TO_DEVICE);
1045
1046 req = list_entry(target->free_reqs.next, struct srp_request, list);
1047
1048 scmnd->scsi_done = done;
1049 scmnd->result = 0;
1050 scmnd->host_scribble = (void *) (long) req->index;
1051
1052 cmd = iu->buf;
1053 memset(cmd, 0, sizeof *cmd);
1054
1055 cmd->opcode = SRP_CMD;
1056 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1057 cmd->tag = req->index;
1058 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1059
1060 req->scmnd = scmnd;
1061 req->cmd = iu;
1062 req->cmd_done = 0;
1063 req->tsk_mgmt = NULL;
1064
1065 len = srp_map_data(scmnd, target, req);
1066 if (len < 0) {
1067 shost_printk(KERN_ERR, target->scsi_host,
1068 PFX "Failed to map data\n");
1069 goto err;
1070 }
1071
1072 if (__srp_post_recv(target)) {
1073 shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1074 goto err_unmap;
1075 }
1076
1077 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1078 DMA_TO_DEVICE);
1079
1080 if (__srp_post_send(target, iu, len)) {
1081 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1082 goto err_unmap;
1083 }
1084
1085 list_move_tail(&req->list, &target->req_queue);
1086
1087 return 0;
1088
1089 err_unmap:
1090 srp_unmap_data(scmnd, target, req);
1091
1092 err:
1093 return SCSI_MLQUEUE_HOST_BUSY;
1094 }
1095
1096 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1097 {
1098 int i;
1099
1100 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1101 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1102 target->max_ti_iu_len,
1103 GFP_KERNEL, DMA_FROM_DEVICE);
1104 if (!target->rx_ring[i])
1105 goto err;
1106 }
1107
1108 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1109 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1110 srp_max_iu_len,
1111 GFP_KERNEL, DMA_TO_DEVICE);
1112 if (!target->tx_ring[i])
1113 goto err;
1114 }
1115
1116 return 0;
1117
1118 err:
1119 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1120 srp_free_iu(target->srp_host, target->rx_ring[i]);
1121 target->rx_ring[i] = NULL;
1122 }
1123
1124 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1125 srp_free_iu(target->srp_host, target->tx_ring[i]);
1126 target->tx_ring[i] = NULL;
1127 }
1128
1129 return -ENOMEM;
1130 }
1131
1132 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1133 struct ib_cm_event *event,
1134 struct srp_target_port *target)
1135 {
1136 struct Scsi_Host *shost = target->scsi_host;
1137 struct ib_class_port_info *cpi;
1138 int opcode;
1139
1140 switch (event->param.rej_rcvd.reason) {
1141 case IB_CM_REJ_PORT_CM_REDIRECT:
1142 cpi = event->param.rej_rcvd.ari;
1143 target->path.dlid = cpi->redirect_lid;
1144 target->path.pkey = cpi->redirect_pkey;
1145 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1146 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1147
1148 target->status = target->path.dlid ?
1149 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1150 break;
1151
1152 case IB_CM_REJ_PORT_REDIRECT:
1153 if (srp_target_is_topspin(target)) {
1154 /*
1155 * Topspin/Cisco SRP gateways incorrectly send
1156 * reject reason code 25 when they mean 24
1157 * (port redirect).
1158 */
1159 memcpy(target->path.dgid.raw,
1160 event->param.rej_rcvd.ari, 16);
1161
1162 shost_printk(KERN_DEBUG, shost,
1163 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1164 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1165 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1166
1167 target->status = SRP_PORT_REDIRECT;
1168 } else {
1169 shost_printk(KERN_WARNING, shost,
1170 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1171 target->status = -ECONNRESET;
1172 }
1173 break;
1174
1175 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1176 shost_printk(KERN_WARNING, shost,
1177 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1178 target->status = -ECONNRESET;
1179 break;
1180
1181 case IB_CM_REJ_CONSUMER_DEFINED:
1182 opcode = *(u8 *) event->private_data;
1183 if (opcode == SRP_LOGIN_REJ) {
1184 struct srp_login_rej *rej = event->private_data;
1185 u32 reason = be32_to_cpu(rej->reason);
1186
1187 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1188 shost_printk(KERN_WARNING, shost,
1189 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1190 else
1191 shost_printk(KERN_WARNING, shost,
1192 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1193 } else
1194 shost_printk(KERN_WARNING, shost,
1195 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1196 " opcode 0x%02x\n", opcode);
1197 target->status = -ECONNRESET;
1198 break;
1199
1200 case IB_CM_REJ_STALE_CONN:
1201 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1202 target->status = SRP_STALE_CONN;
1203 break;
1204
1205 default:
1206 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1207 event->param.rej_rcvd.reason);
1208 target->status = -ECONNRESET;
1209 }
1210 }
1211
1212 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1213 {
1214 struct srp_target_port *target = cm_id->context;
1215 struct ib_qp_attr *qp_attr = NULL;
1216 int attr_mask = 0;
1217 int comp = 0;
1218 int opcode = 0;
1219
1220 switch (event->event) {
1221 case IB_CM_REQ_ERROR:
1222 shost_printk(KERN_DEBUG, target->scsi_host,
1223 PFX "Sending CM REQ failed\n");
1224 comp = 1;
1225 target->status = -ECONNRESET;
1226 break;
1227
1228 case IB_CM_REP_RECEIVED:
1229 comp = 1;
1230 opcode = *(u8 *) event->private_data;
1231
1232 if (opcode == SRP_LOGIN_RSP) {
1233 struct srp_login_rsp *rsp = event->private_data;
1234
1235 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1236 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1237
1238 target->scsi_host->can_queue = min(target->req_lim,
1239 target->scsi_host->can_queue);
1240 } else {
1241 shost_printk(KERN_WARNING, target->scsi_host,
1242 PFX "Unhandled RSP opcode %#x\n", opcode);
1243 target->status = -ECONNRESET;
1244 break;
1245 }
1246
1247 if (!target->rx_ring[0]) {
1248 target->status = srp_alloc_iu_bufs(target);
1249 if (target->status)
1250 break;
1251 }
1252
1253 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1254 if (!qp_attr) {
1255 target->status = -ENOMEM;
1256 break;
1257 }
1258
1259 qp_attr->qp_state = IB_QPS_RTR;
1260 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1261 if (target->status)
1262 break;
1263
1264 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1265 if (target->status)
1266 break;
1267
1268 target->status = srp_post_recv(target);
1269 if (target->status)
1270 break;
1271
1272 qp_attr->qp_state = IB_QPS_RTS;
1273 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1274 if (target->status)
1275 break;
1276
1277 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1278 if (target->status)
1279 break;
1280
1281 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1282 if (target->status)
1283 break;
1284
1285 break;
1286
1287 case IB_CM_REJ_RECEIVED:
1288 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1289 comp = 1;
1290
1291 srp_cm_rej_handler(cm_id, event, target);
1292 break;
1293
1294 case IB_CM_DREQ_RECEIVED:
1295 shost_printk(KERN_WARNING, target->scsi_host,
1296 PFX "DREQ received - connection closed\n");
1297 if (ib_send_cm_drep(cm_id, NULL, 0))
1298 shost_printk(KERN_ERR, target->scsi_host,
1299 PFX "Sending CM DREP failed\n");
1300 break;
1301
1302 case IB_CM_TIMEWAIT_EXIT:
1303 shost_printk(KERN_ERR, target->scsi_host,
1304 PFX "connection closed\n");
1305
1306 comp = 1;
1307 target->status = 0;
1308 break;
1309
1310 case IB_CM_MRA_RECEIVED:
1311 case IB_CM_DREQ_ERROR:
1312 case IB_CM_DREP_RECEIVED:
1313 break;
1314
1315 default:
1316 shost_printk(KERN_WARNING, target->scsi_host,
1317 PFX "Unhandled CM event %d\n", event->event);
1318 break;
1319 }
1320
1321 if (comp)
1322 complete(&target->done);
1323
1324 kfree(qp_attr);
1325
1326 return 0;
1327 }
1328
1329 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1330 struct srp_request *req, u8 func)
1331 {
1332 struct srp_iu *iu;
1333 struct srp_tsk_mgmt *tsk_mgmt;
1334
1335 spin_lock_irq(target->scsi_host->host_lock);
1336
1337 if (target->state == SRP_TARGET_DEAD ||
1338 target->state == SRP_TARGET_REMOVED) {
1339 req->scmnd->result = DID_BAD_TARGET << 16;
1340 goto out;
1341 }
1342
1343 init_completion(&req->done);
1344
1345 iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1346 if (!iu)
1347 goto out;
1348
1349 tsk_mgmt = iu->buf;
1350 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1351
1352 tsk_mgmt->opcode = SRP_TSK_MGMT;
1353 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1354 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1355 tsk_mgmt->tsk_mgmt_func = func;
1356 tsk_mgmt->task_tag = req->index;
1357
1358 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1359 goto out;
1360
1361 req->tsk_mgmt = iu;
1362
1363 spin_unlock_irq(target->scsi_host->host_lock);
1364
1365 if (!wait_for_completion_timeout(&req->done,
1366 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1367 return -1;
1368
1369 return 0;
1370
1371 out:
1372 spin_unlock_irq(target->scsi_host->host_lock);
1373 return -1;
1374 }
1375
1376 static int srp_find_req(struct srp_target_port *target,
1377 struct scsi_cmnd *scmnd,
1378 struct srp_request **req)
1379 {
1380 if (scmnd->host_scribble == (void *) -1L)
1381 return -1;
1382
1383 *req = &target->req_ring[(long) scmnd->host_scribble];
1384
1385 return 0;
1386 }
1387
1388 static int srp_abort(struct scsi_cmnd *scmnd)
1389 {
1390 struct srp_target_port *target = host_to_target(scmnd->device->host);
1391 struct srp_request *req;
1392 int ret = SUCCESS;
1393
1394 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1395
1396 if (target->qp_in_error)
1397 return FAILED;
1398 if (srp_find_req(target, scmnd, &req))
1399 return FAILED;
1400 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1401 return FAILED;
1402
1403 spin_lock_irq(target->scsi_host->host_lock);
1404
1405 if (req->cmd_done) {
1406 srp_remove_req(target, req);
1407 scmnd->scsi_done(scmnd);
1408 } else if (!req->tsk_status) {
1409 srp_remove_req(target, req);
1410 scmnd->result = DID_ABORT << 16;
1411 } else
1412 ret = FAILED;
1413
1414 spin_unlock_irq(target->scsi_host->host_lock);
1415
1416 return ret;
1417 }
1418
1419 static int srp_reset_device(struct scsi_cmnd *scmnd)
1420 {
1421 struct srp_target_port *target = host_to_target(scmnd->device->host);
1422 struct srp_request *req, *tmp;
1423
1424 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1425
1426 if (target->qp_in_error)
1427 return FAILED;
1428 if (srp_find_req(target, scmnd, &req))
1429 return FAILED;
1430 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1431 return FAILED;
1432 if (req->tsk_status)
1433 return FAILED;
1434
1435 spin_lock_irq(target->scsi_host->host_lock);
1436
1437 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1438 if (req->scmnd->device == scmnd->device)
1439 srp_reset_req(target, req);
1440
1441 spin_unlock_irq(target->scsi_host->host_lock);
1442
1443 return SUCCESS;
1444 }
1445
1446 static int srp_reset_host(struct scsi_cmnd *scmnd)
1447 {
1448 struct srp_target_port *target = host_to_target(scmnd->device->host);
1449 int ret = FAILED;
1450
1451 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1452
1453 if (!srp_reconnect_target(target))
1454 ret = SUCCESS;
1455
1456 return ret;
1457 }
1458
1459 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1460 {
1461 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1462
1463 if (target->state == SRP_TARGET_DEAD ||
1464 target->state == SRP_TARGET_REMOVED)
1465 return -ENODEV;
1466
1467 return sprintf(buf, "0x%016llx\n",
1468 (unsigned long long) be64_to_cpu(target->id_ext));
1469 }
1470
1471 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1472 {
1473 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1474
1475 if (target->state == SRP_TARGET_DEAD ||
1476 target->state == SRP_TARGET_REMOVED)
1477 return -ENODEV;
1478
1479 return sprintf(buf, "0x%016llx\n",
1480 (unsigned long long) be64_to_cpu(target->ioc_guid));
1481 }
1482
1483 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1484 {
1485 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1486
1487 if (target->state == SRP_TARGET_DEAD ||
1488 target->state == SRP_TARGET_REMOVED)
1489 return -ENODEV;
1490
1491 return sprintf(buf, "0x%016llx\n",
1492 (unsigned long long) be64_to_cpu(target->service_id));
1493 }
1494
1495 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1496 {
1497 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1498
1499 if (target->state == SRP_TARGET_DEAD ||
1500 target->state == SRP_TARGET_REMOVED)
1501 return -ENODEV;
1502
1503 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1504 }
1505
1506 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1507 {
1508 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1509
1510 if (target->state == SRP_TARGET_DEAD ||
1511 target->state == SRP_TARGET_REMOVED)
1512 return -ENODEV;
1513
1514 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1515 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1516 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1517 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1518 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1519 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1520 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1521 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1522 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1523 }
1524
1525 static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
1526 {
1527 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1528
1529 if (target->state == SRP_TARGET_DEAD ||
1530 target->state == SRP_TARGET_REMOVED)
1531 return -ENODEV;
1532
1533 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1534 be16_to_cpu(target->orig_dgid[0]),
1535 be16_to_cpu(target->orig_dgid[1]),
1536 be16_to_cpu(target->orig_dgid[2]),
1537 be16_to_cpu(target->orig_dgid[3]),
1538 be16_to_cpu(target->orig_dgid[4]),
1539 be16_to_cpu(target->orig_dgid[5]),
1540 be16_to_cpu(target->orig_dgid[6]),
1541 be16_to_cpu(target->orig_dgid[7]));
1542 }
1543
1544 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1545 {
1546 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1547
1548 if (target->state == SRP_TARGET_DEAD ||
1549 target->state == SRP_TARGET_REMOVED)
1550 return -ENODEV;
1551
1552 return sprintf(buf, "%d\n", target->zero_req_lim);
1553 }
1554
1555 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1556 {
1557 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1558
1559 return sprintf(buf, "%d\n", target->srp_host->port);
1560 }
1561
1562 static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1563 {
1564 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1565
1566 return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1567 }
1568
1569 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1570 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1571 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1572 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1573 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1574 static CLASS_DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1575 static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1576 static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1577 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1578
1579 static struct class_device_attribute *srp_host_attrs[] = {
1580 &class_device_attr_id_ext,
1581 &class_device_attr_ioc_guid,
1582 &class_device_attr_service_id,
1583 &class_device_attr_pkey,
1584 &class_device_attr_dgid,
1585 &class_device_attr_orig_dgid,
1586 &class_device_attr_zero_req_lim,
1587 &class_device_attr_local_ib_port,
1588 &class_device_attr_local_ib_device,
1589 NULL
1590 };
1591
1592 static struct scsi_host_template srp_template = {
1593 .module = THIS_MODULE,
1594 .name = "InfiniBand SRP initiator",
1595 .proc_name = DRV_NAME,
1596 .info = srp_target_info,
1597 .queuecommand = srp_queuecommand,
1598 .eh_abort_handler = srp_abort,
1599 .eh_device_reset_handler = srp_reset_device,
1600 .eh_host_reset_handler = srp_reset_host,
1601 .can_queue = SRP_SQ_SIZE,
1602 .this_id = -1,
1603 .cmd_per_lun = SRP_SQ_SIZE,
1604 .use_clustering = ENABLE_CLUSTERING,
1605 .shost_attrs = srp_host_attrs
1606 };
1607
1608 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1609 {
1610 struct srp_rport_identifiers ids;
1611 struct srp_rport *rport;
1612
1613 sprintf(target->target_name, "SRP.T10:%016llX",
1614 (unsigned long long) be64_to_cpu(target->id_ext));
1615
1616 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1617 return -ENODEV;
1618
1619 memcpy(ids.port_id, &target->id_ext, 8);
1620 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1621 ids.roles = SRP_RPORT_ROLE_TARGET;
1622 rport = srp_rport_add(target->scsi_host, &ids);
1623 if (IS_ERR(rport)) {
1624 scsi_remove_host(target->scsi_host);
1625 return PTR_ERR(rport);
1626 }
1627
1628 spin_lock(&host->target_lock);
1629 list_add_tail(&target->list, &host->target_list);
1630 spin_unlock(&host->target_lock);
1631
1632 target->state = SRP_TARGET_LIVE;
1633
1634 scsi_scan_target(&target->scsi_host->shost_gendev,
1635 0, target->scsi_id, SCAN_WILD_CARD, 0);
1636
1637 return 0;
1638 }
1639
1640 static void srp_release_class_dev(struct class_device *class_dev)
1641 {
1642 struct srp_host *host =
1643 container_of(class_dev, struct srp_host, class_dev);
1644
1645 complete(&host->released);
1646 }
1647
1648 static struct class srp_class = {
1649 .name = "infiniband_srp",
1650 .release = srp_release_class_dev
1651 };
1652
1653 /*
1654 * Target ports are added by writing
1655 *
1656 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1657 * pkey=<P_Key>,service_id=<service ID>
1658 *
1659 * to the add_target sysfs attribute.
1660 */
1661 enum {
1662 SRP_OPT_ERR = 0,
1663 SRP_OPT_ID_EXT = 1 << 0,
1664 SRP_OPT_IOC_GUID = 1 << 1,
1665 SRP_OPT_DGID = 1 << 2,
1666 SRP_OPT_PKEY = 1 << 3,
1667 SRP_OPT_SERVICE_ID = 1 << 4,
1668 SRP_OPT_MAX_SECT = 1 << 5,
1669 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1670 SRP_OPT_IO_CLASS = 1 << 7,
1671 SRP_OPT_INITIATOR_EXT = 1 << 8,
1672 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1673 SRP_OPT_IOC_GUID |
1674 SRP_OPT_DGID |
1675 SRP_OPT_PKEY |
1676 SRP_OPT_SERVICE_ID),
1677 };
1678
1679 static match_table_t srp_opt_tokens = {
1680 { SRP_OPT_ID_EXT, "id_ext=%s" },
1681 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1682 { SRP_OPT_DGID, "dgid=%s" },
1683 { SRP_OPT_PKEY, "pkey=%x" },
1684 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1685 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1686 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1687 { SRP_OPT_IO_CLASS, "io_class=%x" },
1688 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1689 { SRP_OPT_ERR, NULL }
1690 };
1691
1692 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1693 {
1694 char *options, *sep_opt;
1695 char *p;
1696 char dgid[3];
1697 substring_t args[MAX_OPT_ARGS];
1698 int opt_mask = 0;
1699 int token;
1700 int ret = -EINVAL;
1701 int i;
1702
1703 options = kstrdup(buf, GFP_KERNEL);
1704 if (!options)
1705 return -ENOMEM;
1706
1707 sep_opt = options;
1708 while ((p = strsep(&sep_opt, ",")) != NULL) {
1709 if (!*p)
1710 continue;
1711
1712 token = match_token(p, srp_opt_tokens, args);
1713 opt_mask |= token;
1714
1715 switch (token) {
1716 case SRP_OPT_ID_EXT:
1717 p = match_strdup(args);
1718 if (!p) {
1719 ret = -ENOMEM;
1720 goto out;
1721 }
1722 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1723 kfree(p);
1724 break;
1725
1726 case SRP_OPT_IOC_GUID:
1727 p = match_strdup(args);
1728 if (!p) {
1729 ret = -ENOMEM;
1730 goto out;
1731 }
1732 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1733 kfree(p);
1734 break;
1735
1736 case SRP_OPT_DGID:
1737 p = match_strdup(args);
1738 if (!p) {
1739 ret = -ENOMEM;
1740 goto out;
1741 }
1742 if (strlen(p) != 32) {
1743 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1744 kfree(p);
1745 goto out;
1746 }
1747
1748 for (i = 0; i < 16; ++i) {
1749 strlcpy(dgid, p + i * 2, 3);
1750 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1751 }
1752 kfree(p);
1753 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1754 break;
1755
1756 case SRP_OPT_PKEY:
1757 if (match_hex(args, &token)) {
1758 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1759 goto out;
1760 }
1761 target->path.pkey = cpu_to_be16(token);
1762 break;
1763
1764 case SRP_OPT_SERVICE_ID:
1765 p = match_strdup(args);
1766 if (!p) {
1767 ret = -ENOMEM;
1768 goto out;
1769 }
1770 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1771 target->path.service_id = target->service_id;
1772 kfree(p);
1773 break;
1774
1775 case SRP_OPT_MAX_SECT:
1776 if (match_int(args, &token)) {
1777 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1778 goto out;
1779 }
1780 target->scsi_host->max_sectors = token;
1781 break;
1782
1783 case SRP_OPT_MAX_CMD_PER_LUN:
1784 if (match_int(args, &token)) {
1785 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1786 goto out;
1787 }
1788 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1789 break;
1790
1791 case SRP_OPT_IO_CLASS:
1792 if (match_hex(args, &token)) {
1793 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1794 goto out;
1795 }
1796 if (token != SRP_REV10_IB_IO_CLASS &&
1797 token != SRP_REV16A_IB_IO_CLASS) {
1798 printk(KERN_WARNING PFX "unknown IO class parameter value"
1799 " %x specified (use %x or %x).\n",
1800 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1801 goto out;
1802 }
1803 target->io_class = token;
1804 break;
1805
1806 case SRP_OPT_INITIATOR_EXT:
1807 p = match_strdup(args);
1808 if (!p) {
1809 ret = -ENOMEM;
1810 goto out;
1811 }
1812 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1813 kfree(p);
1814 break;
1815
1816 default:
1817 printk(KERN_WARNING PFX "unknown parameter or missing value "
1818 "'%s' in target creation request\n", p);
1819 goto out;
1820 }
1821 }
1822
1823 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1824 ret = 0;
1825 else
1826 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1827 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1828 !(srp_opt_tokens[i].token & opt_mask))
1829 printk(KERN_WARNING PFX "target creation request is "
1830 "missing parameter '%s'\n",
1831 srp_opt_tokens[i].pattern);
1832
1833 out:
1834 kfree(options);
1835 return ret;
1836 }
1837
1838 static ssize_t srp_create_target(struct class_device *class_dev,
1839 const char *buf, size_t count)
1840 {
1841 struct srp_host *host =
1842 container_of(class_dev, struct srp_host, class_dev);
1843 struct Scsi_Host *target_host;
1844 struct srp_target_port *target;
1845 int ret;
1846 int i;
1847
1848 target_host = scsi_host_alloc(&srp_template,
1849 sizeof (struct srp_target_port));
1850 if (!target_host)
1851 return -ENOMEM;
1852
1853 target_host->transportt = ib_srp_transport_template;
1854 target_host->max_lun = SRP_MAX_LUN;
1855 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1856
1857 target = host_to_target(target_host);
1858
1859 target->io_class = SRP_REV16A_IB_IO_CLASS;
1860 target->scsi_host = target_host;
1861 target->srp_host = host;
1862
1863 INIT_LIST_HEAD(&target->free_reqs);
1864 INIT_LIST_HEAD(&target->req_queue);
1865 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1866 target->req_ring[i].index = i;
1867 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1868 }
1869
1870 ret = srp_parse_options(buf, target);
1871 if (ret)
1872 goto err;
1873
1874 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1875
1876 shost_printk(KERN_DEBUG, target->scsi_host, PFX
1877 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1878 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1879 (unsigned long long) be64_to_cpu(target->id_ext),
1880 (unsigned long long) be64_to_cpu(target->ioc_guid),
1881 be16_to_cpu(target->path.pkey),
1882 (unsigned long long) be64_to_cpu(target->service_id),
1883 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1884 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1885 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1886 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1887 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1888 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1889 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1890 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1891
1892 ret = srp_create_target_ib(target);
1893 if (ret)
1894 goto err;
1895
1896 ret = srp_new_cm_id(target);
1897 if (ret)
1898 goto err_free;
1899
1900 target->qp_in_error = 0;
1901 ret = srp_connect_target(target);
1902 if (ret) {
1903 shost_printk(KERN_ERR, target->scsi_host,
1904 PFX "Connection failed\n");
1905 goto err_cm_id;
1906 }
1907
1908 ret = srp_add_target(host, target);
1909 if (ret)
1910 goto err_disconnect;
1911
1912 return count;
1913
1914 err_disconnect:
1915 srp_disconnect_target(target);
1916
1917 err_cm_id:
1918 ib_destroy_cm_id(target->cm_id);
1919
1920 err_free:
1921 srp_free_target_ib(target);
1922
1923 err:
1924 scsi_host_put(target_host);
1925
1926 return ret;
1927 }
1928
1929 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1930
1931 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1932 {
1933 struct srp_host *host =
1934 container_of(class_dev, struct srp_host, class_dev);
1935
1936 return sprintf(buf, "%s\n", host->dev->dev->name);
1937 }
1938
1939 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1940
1941 static ssize_t show_port(struct class_device *class_dev, char *buf)
1942 {
1943 struct srp_host *host =
1944 container_of(class_dev, struct srp_host, class_dev);
1945
1946 return sprintf(buf, "%d\n", host->port);
1947 }
1948
1949 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1950
1951 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1952 {
1953 struct srp_host *host;
1954
1955 host = kzalloc(sizeof *host, GFP_KERNEL);
1956 if (!host)
1957 return NULL;
1958
1959 INIT_LIST_HEAD(&host->target_list);
1960 spin_lock_init(&host->target_lock);
1961 init_completion(&host->released);
1962 host->dev = device;
1963 host->port = port;
1964
1965 host->class_dev.class = &srp_class;
1966 host->class_dev.dev = device->dev->dma_device;
1967 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1968 device->dev->name, port);
1969
1970 if (class_device_register(&host->class_dev))
1971 goto free_host;
1972 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1973 goto err_class;
1974 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1975 goto err_class;
1976 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1977 goto err_class;
1978
1979 return host;
1980
1981 err_class:
1982 class_device_unregister(&host->class_dev);
1983
1984 free_host:
1985 kfree(host);
1986
1987 return NULL;
1988 }
1989
1990 static void srp_add_one(struct ib_device *device)
1991 {
1992 struct srp_device *srp_dev;
1993 struct ib_device_attr *dev_attr;
1994 struct ib_fmr_pool_param fmr_param;
1995 struct srp_host *host;
1996 int s, e, p;
1997
1998 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1999 if (!dev_attr)
2000 return;
2001
2002 if (ib_query_device(device, dev_attr)) {
2003 printk(KERN_WARNING PFX "Query device failed for %s\n",
2004 device->name);
2005 goto free_attr;
2006 }
2007
2008 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2009 if (!srp_dev)
2010 goto free_attr;
2011
2012 /*
2013 * Use the smallest page size supported by the HCA, down to a
2014 * minimum of 512 bytes (which is the smallest sector that a
2015 * SCSI command will ever carry).
2016 */
2017 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2018 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
2019 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2020
2021 INIT_LIST_HEAD(&srp_dev->dev_list);
2022
2023 srp_dev->dev = device;
2024 srp_dev->pd = ib_alloc_pd(device);
2025 if (IS_ERR(srp_dev->pd))
2026 goto free_dev;
2027
2028 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2029 IB_ACCESS_LOCAL_WRITE |
2030 IB_ACCESS_REMOTE_READ |
2031 IB_ACCESS_REMOTE_WRITE);
2032 if (IS_ERR(srp_dev->mr))
2033 goto err_pd;
2034
2035 memset(&fmr_param, 0, sizeof fmr_param);
2036 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2037 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2038 fmr_param.cache = 1;
2039 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2040 fmr_param.page_shift = srp_dev->fmr_page_shift;
2041 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2042 IB_ACCESS_REMOTE_WRITE |
2043 IB_ACCESS_REMOTE_READ);
2044
2045 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2046 if (IS_ERR(srp_dev->fmr_pool))
2047 srp_dev->fmr_pool = NULL;
2048
2049 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2050 s = 0;
2051 e = 0;
2052 } else {
2053 s = 1;
2054 e = device->phys_port_cnt;
2055 }
2056
2057 for (p = s; p <= e; ++p) {
2058 host = srp_add_port(srp_dev, p);
2059 if (host)
2060 list_add_tail(&host->list, &srp_dev->dev_list);
2061 }
2062
2063 ib_set_client_data(device, &srp_client, srp_dev);
2064
2065 goto free_attr;
2066
2067 err_pd:
2068 ib_dealloc_pd(srp_dev->pd);
2069
2070 free_dev:
2071 kfree(srp_dev);
2072
2073 free_attr:
2074 kfree(dev_attr);
2075 }
2076
2077 static void srp_remove_one(struct ib_device *device)
2078 {
2079 struct srp_device *srp_dev;
2080 struct srp_host *host, *tmp_host;
2081 LIST_HEAD(target_list);
2082 struct srp_target_port *target, *tmp_target;
2083
2084 srp_dev = ib_get_client_data(device, &srp_client);
2085
2086 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2087 class_device_unregister(&host->class_dev);
2088 /*
2089 * Wait for the sysfs entry to go away, so that no new
2090 * target ports can be created.
2091 */
2092 wait_for_completion(&host->released);
2093
2094 /*
2095 * Mark all target ports as removed, so we stop queueing
2096 * commands and don't try to reconnect.
2097 */
2098 spin_lock(&host->target_lock);
2099 list_for_each_entry(target, &host->target_list, list) {
2100 spin_lock_irq(target->scsi_host->host_lock);
2101 target->state = SRP_TARGET_REMOVED;
2102 spin_unlock_irq(target->scsi_host->host_lock);
2103 }
2104 spin_unlock(&host->target_lock);
2105
2106 /*
2107 * Wait for any reconnection tasks that may have
2108 * started before we marked our target ports as
2109 * removed, and any target port removal tasks.
2110 */
2111 flush_scheduled_work();
2112
2113 list_for_each_entry_safe(target, tmp_target,
2114 &host->target_list, list) {
2115 srp_remove_host(target->scsi_host);
2116 scsi_remove_host(target->scsi_host);
2117 srp_disconnect_target(target);
2118 ib_destroy_cm_id(target->cm_id);
2119 srp_free_target_ib(target);
2120 scsi_host_put(target->scsi_host);
2121 }
2122
2123 kfree(host);
2124 }
2125
2126 if (srp_dev->fmr_pool)
2127 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2128 ib_dereg_mr(srp_dev->mr);
2129 ib_dealloc_pd(srp_dev->pd);
2130
2131 kfree(srp_dev);
2132 }
2133
2134 static struct srp_function_template ib_srp_transport_functions = {
2135 };
2136
2137 static int __init srp_init_module(void)
2138 {
2139 int ret;
2140
2141 ib_srp_transport_template =
2142 srp_attach_transport(&ib_srp_transport_functions);
2143 if (!ib_srp_transport_template)
2144 return -ENOMEM;
2145
2146 srp_template.sg_tablesize = srp_sg_tablesize;
2147 srp_max_iu_len = (sizeof (struct srp_cmd) +
2148 sizeof (struct srp_indirect_buf) +
2149 srp_sg_tablesize * 16);
2150
2151 ret = class_register(&srp_class);
2152 if (ret) {
2153 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2154 srp_release_transport(ib_srp_transport_template);
2155 return ret;
2156 }
2157
2158 ib_sa_register_client(&srp_sa_client);
2159
2160 ret = ib_register_client(&srp_client);
2161 if (ret) {
2162 printk(KERN_ERR PFX "couldn't register IB client\n");
2163 srp_release_transport(ib_srp_transport_template);
2164 ib_sa_unregister_client(&srp_sa_client);
2165 class_unregister(&srp_class);
2166 return ret;
2167 }
2168
2169 return 0;
2170 }
2171
2172 static void __exit srp_cleanup_module(void)
2173 {
2174 ib_unregister_client(&srp_client);
2175 ib_sa_unregister_client(&srp_sa_client);
2176 class_unregister(&srp_class);
2177 srp_release_transport(ib_srp_transport_template);
2178 }
2179
2180 module_init(srp_init_module);
2181 module_exit(srp_cleanup_module);
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