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Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[deliverable/linux.git] / drivers / infiniband / ulp / srp / ib_srp.c
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
51 #include <rdma/ib_cache.h>
52
53 #include "ib_srp.h"
54
55 #define DRV_NAME "ib_srp"
56 #define PFX DRV_NAME ": "
57 #define DRV_VERSION "0.2"
58 #define DRV_RELDATE "November 1, 2005"
59
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63 MODULE_LICENSE("Dual BSD/GPL");
64
65 static int topspin_workarounds = 1;
66
67 module_param(topspin_workarounds, int, 0444);
68 MODULE_PARM_DESC(topspin_workarounds,
69 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
70
71 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
72
73 static void srp_add_one(struct ib_device *device);
74 static void srp_remove_one(struct ib_device *device);
75 static void srp_completion(struct ib_cq *cq, void *target_ptr);
76 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
77
78 static struct ib_client srp_client = {
79 .name = "srp",
80 .add = srp_add_one,
81 .remove = srp_remove_one
82 };
83
84 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
85 {
86 return (struct srp_target_port *) host->hostdata;
87 }
88
89 static const char *srp_target_info(struct Scsi_Host *host)
90 {
91 return host_to_target(host)->target_name;
92 }
93
94 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
95 gfp_t gfp_mask,
96 enum dma_data_direction direction)
97 {
98 struct srp_iu *iu;
99
100 iu = kmalloc(sizeof *iu, gfp_mask);
101 if (!iu)
102 goto out;
103
104 iu->buf = kzalloc(size, gfp_mask);
105 if (!iu->buf)
106 goto out_free_iu;
107
108 iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
109 if (dma_mapping_error(iu->dma))
110 goto out_free_buf;
111
112 iu->size = size;
113 iu->direction = direction;
114
115 return iu;
116
117 out_free_buf:
118 kfree(iu->buf);
119 out_free_iu:
120 kfree(iu);
121 out:
122 return NULL;
123 }
124
125 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
126 {
127 if (!iu)
128 return;
129
130 dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
131 kfree(iu->buf);
132 kfree(iu);
133 }
134
135 static void srp_qp_event(struct ib_event *event, void *context)
136 {
137 printk(KERN_ERR PFX "QP event %d\n", event->event);
138 }
139
140 static int srp_init_qp(struct srp_target_port *target,
141 struct ib_qp *qp)
142 {
143 struct ib_qp_attr *attr;
144 int ret;
145
146 attr = kmalloc(sizeof *attr, GFP_KERNEL);
147 if (!attr)
148 return -ENOMEM;
149
150 ret = ib_find_cached_pkey(target->srp_host->dev,
151 target->srp_host->port,
152 be16_to_cpu(target->path.pkey),
153 &attr->pkey_index);
154 if (ret)
155 goto out;
156
157 attr->qp_state = IB_QPS_INIT;
158 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
159 IB_ACCESS_REMOTE_WRITE);
160 attr->port_num = target->srp_host->port;
161
162 ret = ib_modify_qp(qp, attr,
163 IB_QP_STATE |
164 IB_QP_PKEY_INDEX |
165 IB_QP_ACCESS_FLAGS |
166 IB_QP_PORT);
167
168 out:
169 kfree(attr);
170 return ret;
171 }
172
173 static int srp_create_target_ib(struct srp_target_port *target)
174 {
175 struct ib_qp_init_attr *init_attr;
176 int ret;
177
178 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
179 if (!init_attr)
180 return -ENOMEM;
181
182 target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
183 NULL, target, SRP_CQ_SIZE);
184 if (IS_ERR(target->cq)) {
185 ret = PTR_ERR(target->cq);
186 goto out;
187 }
188
189 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
190
191 init_attr->event_handler = srp_qp_event;
192 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
193 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
194 init_attr->cap.max_recv_sge = 1;
195 init_attr->cap.max_send_sge = 1;
196 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
197 init_attr->qp_type = IB_QPT_RC;
198 init_attr->send_cq = target->cq;
199 init_attr->recv_cq = target->cq;
200
201 target->qp = ib_create_qp(target->srp_host->pd, init_attr);
202 if (IS_ERR(target->qp)) {
203 ret = PTR_ERR(target->qp);
204 ib_destroy_cq(target->cq);
205 goto out;
206 }
207
208 ret = srp_init_qp(target, target->qp);
209 if (ret) {
210 ib_destroy_qp(target->qp);
211 ib_destroy_cq(target->cq);
212 goto out;
213 }
214
215 out:
216 kfree(init_attr);
217 return ret;
218 }
219
220 static void srp_free_target_ib(struct srp_target_port *target)
221 {
222 int i;
223
224 ib_destroy_qp(target->qp);
225 ib_destroy_cq(target->cq);
226
227 for (i = 0; i < SRP_RQ_SIZE; ++i)
228 srp_free_iu(target->srp_host, target->rx_ring[i]);
229 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
230 srp_free_iu(target->srp_host, target->tx_ring[i]);
231 }
232
233 static void srp_path_rec_completion(int status,
234 struct ib_sa_path_rec *pathrec,
235 void *target_ptr)
236 {
237 struct srp_target_port *target = target_ptr;
238
239 target->status = status;
240 if (status)
241 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
242 else
243 target->path = *pathrec;
244 complete(&target->done);
245 }
246
247 static int srp_lookup_path(struct srp_target_port *target)
248 {
249 target->path.numb_path = 1;
250
251 init_completion(&target->done);
252
253 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
254 target->srp_host->port,
255 &target->path,
256 IB_SA_PATH_REC_DGID |
257 IB_SA_PATH_REC_SGID |
258 IB_SA_PATH_REC_NUMB_PATH |
259 IB_SA_PATH_REC_PKEY,
260 SRP_PATH_REC_TIMEOUT_MS,
261 GFP_KERNEL,
262 srp_path_rec_completion,
263 target, &target->path_query);
264 if (target->path_query_id < 0)
265 return target->path_query_id;
266
267 wait_for_completion(&target->done);
268
269 if (target->status < 0)
270 printk(KERN_WARNING PFX "Path record query failed\n");
271
272 return target->status;
273 }
274
275 static int srp_send_req(struct srp_target_port *target)
276 {
277 struct {
278 struct ib_cm_req_param param;
279 struct srp_login_req priv;
280 } *req = NULL;
281 int status;
282
283 req = kzalloc(sizeof *req, GFP_KERNEL);
284 if (!req)
285 return -ENOMEM;
286
287 req->param.primary_path = &target->path;
288 req->param.alternate_path = NULL;
289 req->param.service_id = target->service_id;
290 req->param.qp_num = target->qp->qp_num;
291 req->param.qp_type = target->qp->qp_type;
292 req->param.private_data = &req->priv;
293 req->param.private_data_len = sizeof req->priv;
294 req->param.flow_control = 1;
295
296 get_random_bytes(&req->param.starting_psn, 4);
297 req->param.starting_psn &= 0xffffff;
298
299 /*
300 * Pick some arbitrary defaults here; we could make these
301 * module parameters if anyone cared about setting them.
302 */
303 req->param.responder_resources = 4;
304 req->param.remote_cm_response_timeout = 20;
305 req->param.local_cm_response_timeout = 20;
306 req->param.retry_count = 7;
307 req->param.rnr_retry_count = 7;
308 req->param.max_cm_retries = 15;
309
310 req->priv.opcode = SRP_LOGIN_REQ;
311 req->priv.tag = 0;
312 req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
313 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
314 SRP_BUF_FORMAT_INDIRECT);
315 memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
316 /*
317 * Topspin/Cisco SRP targets will reject our login unless we
318 * zero out the first 8 bytes of our initiator port ID. The
319 * second 8 bytes must be our local node GUID, but we always
320 * use that anyway.
321 */
322 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
323 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
324 "activated for target GUID %016llx\n",
325 (unsigned long long) be64_to_cpu(target->ioc_guid));
326 memset(req->priv.initiator_port_id, 0, 8);
327 }
328 memcpy(req->priv.target_port_id, &target->id_ext, 8);
329 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
330
331 status = ib_send_cm_req(target->cm_id, &req->param);
332
333 kfree(req);
334
335 return status;
336 }
337
338 static void srp_disconnect_target(struct srp_target_port *target)
339 {
340 /* XXX should send SRP_I_LOGOUT request */
341
342 init_completion(&target->done);
343 ib_send_cm_dreq(target->cm_id, NULL, 0);
344 wait_for_completion(&target->done);
345 }
346
347 static void srp_remove_work(void *target_ptr)
348 {
349 struct srp_target_port *target = target_ptr;
350
351 spin_lock_irq(target->scsi_host->host_lock);
352 if (target->state != SRP_TARGET_DEAD) {
353 spin_unlock_irq(target->scsi_host->host_lock);
354 scsi_host_put(target->scsi_host);
355 return;
356 }
357 target->state = SRP_TARGET_REMOVED;
358 spin_unlock_irq(target->scsi_host->host_lock);
359
360 mutex_lock(&target->srp_host->target_mutex);
361 list_del(&target->list);
362 mutex_unlock(&target->srp_host->target_mutex);
363
364 scsi_remove_host(target->scsi_host);
365 ib_destroy_cm_id(target->cm_id);
366 srp_free_target_ib(target);
367 scsi_host_put(target->scsi_host);
368 /* And another put to really free the target port... */
369 scsi_host_put(target->scsi_host);
370 }
371
372 static int srp_connect_target(struct srp_target_port *target)
373 {
374 int ret;
375
376 ret = srp_lookup_path(target);
377 if (ret)
378 return ret;
379
380 while (1) {
381 init_completion(&target->done);
382 ret = srp_send_req(target);
383 if (ret)
384 return ret;
385 wait_for_completion(&target->done);
386
387 /*
388 * The CM event handling code will set status to
389 * SRP_PORT_REDIRECT if we get a port redirect REJ
390 * back, or SRP_DLID_REDIRECT if we get a lid/qp
391 * redirect REJ back.
392 */
393 switch (target->status) {
394 case 0:
395 return 0;
396
397 case SRP_PORT_REDIRECT:
398 ret = srp_lookup_path(target);
399 if (ret)
400 return ret;
401 break;
402
403 case SRP_DLID_REDIRECT:
404 break;
405
406 default:
407 return target->status;
408 }
409 }
410 }
411
412 static int srp_reconnect_target(struct srp_target_port *target)
413 {
414 struct ib_cm_id *new_cm_id;
415 struct ib_qp_attr qp_attr;
416 struct srp_request *req;
417 struct ib_wc wc;
418 int ret;
419 int i;
420
421 spin_lock_irq(target->scsi_host->host_lock);
422 if (target->state != SRP_TARGET_LIVE) {
423 spin_unlock_irq(target->scsi_host->host_lock);
424 return -EAGAIN;
425 }
426 target->state = SRP_TARGET_CONNECTING;
427 spin_unlock_irq(target->scsi_host->host_lock);
428
429 srp_disconnect_target(target);
430 /*
431 * Now get a new local CM ID so that we avoid confusing the
432 * target in case things are really fouled up.
433 */
434 new_cm_id = ib_create_cm_id(target->srp_host->dev,
435 srp_cm_handler, target);
436 if (IS_ERR(new_cm_id)) {
437 ret = PTR_ERR(new_cm_id);
438 goto err;
439 }
440 ib_destroy_cm_id(target->cm_id);
441 target->cm_id = new_cm_id;
442
443 qp_attr.qp_state = IB_QPS_RESET;
444 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
445 if (ret)
446 goto err;
447
448 ret = srp_init_qp(target, target->qp);
449 if (ret)
450 goto err;
451
452 while (ib_poll_cq(target->cq, 1, &wc) > 0)
453 ; /* nothing */
454
455 list_for_each_entry(req, &target->req_queue, list) {
456 req->scmnd->result = DID_RESET << 16;
457 req->scmnd->scsi_done(req->scmnd);
458 }
459
460 target->rx_head = 0;
461 target->tx_head = 0;
462 target->tx_tail = 0;
463 target->req_head = 0;
464 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
465 target->req_ring[i].next = i + 1;
466 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
467 INIT_LIST_HEAD(&target->req_queue);
468
469 ret = srp_connect_target(target);
470 if (ret)
471 goto err;
472
473 spin_lock_irq(target->scsi_host->host_lock);
474 if (target->state == SRP_TARGET_CONNECTING) {
475 ret = 0;
476 target->state = SRP_TARGET_LIVE;
477 } else
478 ret = -EAGAIN;
479 spin_unlock_irq(target->scsi_host->host_lock);
480
481 return ret;
482
483 err:
484 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
485
486 /*
487 * We couldn't reconnect, so kill our target port off.
488 * However, we have to defer the real removal because we might
489 * be in the context of the SCSI error handler now, which
490 * would deadlock if we call scsi_remove_host().
491 */
492 spin_lock_irq(target->scsi_host->host_lock);
493 if (target->state == SRP_TARGET_CONNECTING) {
494 target->state = SRP_TARGET_DEAD;
495 INIT_WORK(&target->work, srp_remove_work, target);
496 schedule_work(&target->work);
497 }
498 spin_unlock_irq(target->scsi_host->host_lock);
499
500 return ret;
501 }
502
503 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
504 struct srp_request *req)
505 {
506 struct scatterlist *scat;
507 struct srp_cmd *cmd = req->cmd->buf;
508 int len, nents, count;
509 int i;
510 u8 fmt;
511
512 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
513 return sizeof (struct srp_cmd);
514
515 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
516 scmnd->sc_data_direction != DMA_TO_DEVICE) {
517 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
518 scmnd->sc_data_direction);
519 return -EINVAL;
520 }
521
522 /*
523 * This handling of non-SG commands can be killed when the
524 * SCSI midlayer no longer generates non-SG commands.
525 */
526 if (likely(scmnd->use_sg)) {
527 nents = scmnd->use_sg;
528 scat = scmnd->request_buffer;
529 } else {
530 nents = 1;
531 scat = &req->fake_sg;
532 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
533 }
534
535 count = dma_map_sg(target->srp_host->dev->dma_device, scat, nents,
536 scmnd->sc_data_direction);
537
538 if (count == 1) {
539 struct srp_direct_buf *buf = (void *) cmd->add_data;
540
541 fmt = SRP_DATA_DESC_DIRECT;
542
543 buf->va = cpu_to_be64(sg_dma_address(scat));
544 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
545 buf->len = cpu_to_be32(sg_dma_len(scat));
546
547 len = sizeof (struct srp_cmd) +
548 sizeof (struct srp_direct_buf);
549 } else {
550 struct srp_indirect_buf *buf = (void *) cmd->add_data;
551 u32 datalen = 0;
552
553 fmt = SRP_DATA_DESC_INDIRECT;
554
555 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
556 cmd->data_out_desc_cnt = count;
557 else
558 cmd->data_in_desc_cnt = count;
559
560 buf->table_desc.va = cpu_to_be64(req->cmd->dma +
561 sizeof *cmd +
562 sizeof *buf);
563 buf->table_desc.key =
564 cpu_to_be32(target->srp_host->mr->rkey);
565 buf->table_desc.len =
566 cpu_to_be32(count * sizeof (struct srp_direct_buf));
567
568 for (i = 0; i < count; ++i) {
569 buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
570 buf->desc_list[i].key =
571 cpu_to_be32(target->srp_host->mr->rkey);
572 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
573
574 datalen += sg_dma_len(&scat[i]);
575 }
576
577 buf->len = cpu_to_be32(datalen);
578
579 len = sizeof (struct srp_cmd) +
580 sizeof (struct srp_indirect_buf) +
581 count * sizeof (struct srp_direct_buf);
582 }
583
584 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
585 cmd->buf_fmt = fmt << 4;
586 else
587 cmd->buf_fmt = fmt;
588
589 return len;
590 }
591
592 static void srp_unmap_data(struct scsi_cmnd *scmnd,
593 struct srp_target_port *target,
594 struct srp_request *req)
595 {
596 struct scatterlist *scat;
597 int nents;
598
599 if (!scmnd->request_buffer ||
600 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
601 scmnd->sc_data_direction != DMA_FROM_DEVICE))
602 return;
603
604 /*
605 * This handling of non-SG commands can be killed when the
606 * SCSI midlayer no longer generates non-SG commands.
607 */
608 if (likely(scmnd->use_sg)) {
609 nents = scmnd->use_sg;
610 scat = scmnd->request_buffer;
611 } else {
612 nents = 1;
613 scat = &req->fake_sg;
614 }
615
616 dma_unmap_sg(target->srp_host->dev->dma_device, scat, nents,
617 scmnd->sc_data_direction);
618 }
619
620 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req,
621 int index)
622 {
623 list_del(&req->list);
624 req->next = target->req_head;
625 target->req_head = index;
626 }
627
628 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
629 {
630 struct srp_request *req;
631 struct scsi_cmnd *scmnd;
632 unsigned long flags;
633 s32 delta;
634
635 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
636
637 spin_lock_irqsave(target->scsi_host->host_lock, flags);
638
639 target->req_lim += delta;
640
641 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
642
643 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
644 if (be32_to_cpu(rsp->resp_data_len) < 4)
645 req->tsk_status = -1;
646 else
647 req->tsk_status = rsp->data[3];
648 complete(&req->done);
649 } else {
650 scmnd = req->scmnd;
651 if (!scmnd)
652 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
653 (unsigned long long) rsp->tag);
654 scmnd->result = rsp->status;
655
656 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
657 memcpy(scmnd->sense_buffer, rsp->data +
658 be32_to_cpu(rsp->resp_data_len),
659 min_t(int, be32_to_cpu(rsp->sense_data_len),
660 SCSI_SENSE_BUFFERSIZE));
661 }
662
663 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
664 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
665 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
666 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
667
668 srp_unmap_data(scmnd, target, req);
669
670 if (!req->tsk_mgmt) {
671 req->scmnd = NULL;
672 scmnd->host_scribble = (void *) -1L;
673 scmnd->scsi_done(scmnd);
674
675 srp_remove_req(target, req, rsp->tag & ~SRP_TAG_TSK_MGMT);
676 } else
677 req->cmd_done = 1;
678 }
679
680 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
681 }
682
683 static void srp_reconnect_work(void *target_ptr)
684 {
685 struct srp_target_port *target = target_ptr;
686
687 srp_reconnect_target(target);
688 }
689
690 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
691 {
692 struct srp_iu *iu;
693 u8 opcode;
694
695 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
696
697 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
698 target->max_ti_iu_len, DMA_FROM_DEVICE);
699
700 opcode = *(u8 *) iu->buf;
701
702 if (0) {
703 int i;
704
705 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
706
707 for (i = 0; i < wc->byte_len; ++i) {
708 if (i % 8 == 0)
709 printk(KERN_ERR " [%02x] ", i);
710 printk(" %02x", ((u8 *) iu->buf)[i]);
711 if ((i + 1) % 8 == 0)
712 printk("\n");
713 }
714
715 if (wc->byte_len % 8)
716 printk("\n");
717 }
718
719 switch (opcode) {
720 case SRP_RSP:
721 srp_process_rsp(target, iu->buf);
722 break;
723
724 case SRP_T_LOGOUT:
725 /* XXX Handle target logout */
726 printk(KERN_WARNING PFX "Got target logout request\n");
727 break;
728
729 default:
730 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
731 break;
732 }
733
734 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
735 target->max_ti_iu_len, DMA_FROM_DEVICE);
736 }
737
738 static void srp_completion(struct ib_cq *cq, void *target_ptr)
739 {
740 struct srp_target_port *target = target_ptr;
741 struct ib_wc wc;
742 unsigned long flags;
743
744 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
745 while (ib_poll_cq(cq, 1, &wc) > 0) {
746 if (wc.status) {
747 printk(KERN_ERR PFX "failed %s status %d\n",
748 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
749 wc.status);
750 spin_lock_irqsave(target->scsi_host->host_lock, flags);
751 if (target->state == SRP_TARGET_LIVE)
752 schedule_work(&target->work);
753 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
754 break;
755 }
756
757 if (wc.wr_id & SRP_OP_RECV)
758 srp_handle_recv(target, &wc);
759 else
760 ++target->tx_tail;
761 }
762 }
763
764 static int __srp_post_recv(struct srp_target_port *target)
765 {
766 struct srp_iu *iu;
767 struct ib_sge list;
768 struct ib_recv_wr wr, *bad_wr;
769 unsigned int next;
770 int ret;
771
772 next = target->rx_head & (SRP_RQ_SIZE - 1);
773 wr.wr_id = next | SRP_OP_RECV;
774 iu = target->rx_ring[next];
775
776 list.addr = iu->dma;
777 list.length = iu->size;
778 list.lkey = target->srp_host->mr->lkey;
779
780 wr.next = NULL;
781 wr.sg_list = &list;
782 wr.num_sge = 1;
783
784 ret = ib_post_recv(target->qp, &wr, &bad_wr);
785 if (!ret)
786 ++target->rx_head;
787
788 return ret;
789 }
790
791 static int srp_post_recv(struct srp_target_port *target)
792 {
793 unsigned long flags;
794 int ret;
795
796 spin_lock_irqsave(target->scsi_host->host_lock, flags);
797 ret = __srp_post_recv(target);
798 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
799
800 return ret;
801 }
802
803 /*
804 * Must be called with target->scsi_host->host_lock held to protect
805 * req_lim and tx_head. Lock cannot be dropped between call here and
806 * call to __srp_post_send().
807 */
808 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
809 {
810 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
811 return NULL;
812
813 if (unlikely(target->req_lim < 1)) {
814 if (printk_ratelimit())
815 printk(KERN_DEBUG PFX "Target has req_lim %d\n",
816 target->req_lim);
817 return NULL;
818 }
819
820 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
821 }
822
823 /*
824 * Must be called with target->scsi_host->host_lock held to protect
825 * req_lim and tx_head.
826 */
827 static int __srp_post_send(struct srp_target_port *target,
828 struct srp_iu *iu, int len)
829 {
830 struct ib_sge list;
831 struct ib_send_wr wr, *bad_wr;
832 int ret = 0;
833
834 list.addr = iu->dma;
835 list.length = len;
836 list.lkey = target->srp_host->mr->lkey;
837
838 wr.next = NULL;
839 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
840 wr.sg_list = &list;
841 wr.num_sge = 1;
842 wr.opcode = IB_WR_SEND;
843 wr.send_flags = IB_SEND_SIGNALED;
844
845 ret = ib_post_send(target->qp, &wr, &bad_wr);
846
847 if (!ret) {
848 ++target->tx_head;
849 --target->req_lim;
850 }
851
852 return ret;
853 }
854
855 static int srp_queuecommand(struct scsi_cmnd *scmnd,
856 void (*done)(struct scsi_cmnd *))
857 {
858 struct srp_target_port *target = host_to_target(scmnd->device->host);
859 struct srp_request *req;
860 struct srp_iu *iu;
861 struct srp_cmd *cmd;
862 long req_index;
863 int len;
864
865 if (target->state == SRP_TARGET_CONNECTING)
866 goto err;
867
868 if (target->state == SRP_TARGET_DEAD ||
869 target->state == SRP_TARGET_REMOVED) {
870 scmnd->result = DID_BAD_TARGET << 16;
871 done(scmnd);
872 return 0;
873 }
874
875 iu = __srp_get_tx_iu(target);
876 if (!iu)
877 goto err;
878
879 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
880 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
881
882 req_index = target->req_head;
883
884 scmnd->scsi_done = done;
885 scmnd->result = 0;
886 scmnd->host_scribble = (void *) req_index;
887
888 cmd = iu->buf;
889 memset(cmd, 0, sizeof *cmd);
890
891 cmd->opcode = SRP_CMD;
892 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
893 cmd->tag = req_index;
894 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
895
896 req = &target->req_ring[req_index];
897
898 req->scmnd = scmnd;
899 req->cmd = iu;
900 req->cmd_done = 0;
901 req->tsk_mgmt = NULL;
902
903 len = srp_map_data(scmnd, target, req);
904 if (len < 0) {
905 printk(KERN_ERR PFX "Failed to map data\n");
906 goto err;
907 }
908
909 if (__srp_post_recv(target)) {
910 printk(KERN_ERR PFX "Recv failed\n");
911 goto err_unmap;
912 }
913
914 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
915 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
916
917 if (__srp_post_send(target, iu, len)) {
918 printk(KERN_ERR PFX "Send failed\n");
919 goto err_unmap;
920 }
921
922 target->req_head = req->next;
923 list_add_tail(&req->list, &target->req_queue);
924
925 return 0;
926
927 err_unmap:
928 srp_unmap_data(scmnd, target, req);
929
930 err:
931 return SCSI_MLQUEUE_HOST_BUSY;
932 }
933
934 static int srp_alloc_iu_bufs(struct srp_target_port *target)
935 {
936 int i;
937
938 for (i = 0; i < SRP_RQ_SIZE; ++i) {
939 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
940 target->max_ti_iu_len,
941 GFP_KERNEL, DMA_FROM_DEVICE);
942 if (!target->rx_ring[i])
943 goto err;
944 }
945
946 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
947 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
948 SRP_MAX_IU_LEN,
949 GFP_KERNEL, DMA_TO_DEVICE);
950 if (!target->tx_ring[i])
951 goto err;
952 }
953
954 return 0;
955
956 err:
957 for (i = 0; i < SRP_RQ_SIZE; ++i) {
958 srp_free_iu(target->srp_host, target->rx_ring[i]);
959 target->rx_ring[i] = NULL;
960 }
961
962 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
963 srp_free_iu(target->srp_host, target->tx_ring[i]);
964 target->tx_ring[i] = NULL;
965 }
966
967 return -ENOMEM;
968 }
969
970 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
971 struct ib_cm_event *event,
972 struct srp_target_port *target)
973 {
974 struct ib_class_port_info *cpi;
975 int opcode;
976
977 switch (event->param.rej_rcvd.reason) {
978 case IB_CM_REJ_PORT_CM_REDIRECT:
979 cpi = event->param.rej_rcvd.ari;
980 target->path.dlid = cpi->redirect_lid;
981 target->path.pkey = cpi->redirect_pkey;
982 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
983 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
984
985 target->status = target->path.dlid ?
986 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
987 break;
988
989 case IB_CM_REJ_PORT_REDIRECT:
990 if (topspin_workarounds &&
991 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
992 /*
993 * Topspin/Cisco SRP gateways incorrectly send
994 * reject reason code 25 when they mean 24
995 * (port redirect).
996 */
997 memcpy(target->path.dgid.raw,
998 event->param.rej_rcvd.ari, 16);
999
1000 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1001 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1002 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1003
1004 target->status = SRP_PORT_REDIRECT;
1005 } else {
1006 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1007 target->status = -ECONNRESET;
1008 }
1009 break;
1010
1011 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1012 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1013 target->status = -ECONNRESET;
1014 break;
1015
1016 case IB_CM_REJ_CONSUMER_DEFINED:
1017 opcode = *(u8 *) event->private_data;
1018 if (opcode == SRP_LOGIN_REJ) {
1019 struct srp_login_rej *rej = event->private_data;
1020 u32 reason = be32_to_cpu(rej->reason);
1021
1022 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1023 printk(KERN_WARNING PFX
1024 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1025 else
1026 printk(KERN_WARNING PFX
1027 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1028 } else
1029 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1030 " opcode 0x%02x\n", opcode);
1031 target->status = -ECONNRESET;
1032 break;
1033
1034 default:
1035 printk(KERN_WARNING " REJ reason 0x%x\n",
1036 event->param.rej_rcvd.reason);
1037 target->status = -ECONNRESET;
1038 }
1039 }
1040
1041 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1042 {
1043 struct srp_target_port *target = cm_id->context;
1044 struct ib_qp_attr *qp_attr = NULL;
1045 int attr_mask = 0;
1046 int comp = 0;
1047 int opcode = 0;
1048
1049 switch (event->event) {
1050 case IB_CM_REQ_ERROR:
1051 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1052 comp = 1;
1053 target->status = -ECONNRESET;
1054 break;
1055
1056 case IB_CM_REP_RECEIVED:
1057 comp = 1;
1058 opcode = *(u8 *) event->private_data;
1059
1060 if (opcode == SRP_LOGIN_RSP) {
1061 struct srp_login_rsp *rsp = event->private_data;
1062
1063 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1064 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1065
1066 target->scsi_host->can_queue = min(target->req_lim,
1067 target->scsi_host->can_queue);
1068 } else {
1069 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1070 target->status = -ECONNRESET;
1071 break;
1072 }
1073
1074 target->status = srp_alloc_iu_bufs(target);
1075 if (target->status)
1076 break;
1077
1078 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1079 if (!qp_attr) {
1080 target->status = -ENOMEM;
1081 break;
1082 }
1083
1084 qp_attr->qp_state = IB_QPS_RTR;
1085 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1086 if (target->status)
1087 break;
1088
1089 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1090 if (target->status)
1091 break;
1092
1093 target->status = srp_post_recv(target);
1094 if (target->status)
1095 break;
1096
1097 qp_attr->qp_state = IB_QPS_RTS;
1098 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1099 if (target->status)
1100 break;
1101
1102 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1103 if (target->status)
1104 break;
1105
1106 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1107 if (target->status)
1108 break;
1109
1110 break;
1111
1112 case IB_CM_REJ_RECEIVED:
1113 printk(KERN_DEBUG PFX "REJ received\n");
1114 comp = 1;
1115
1116 srp_cm_rej_handler(cm_id, event, target);
1117 break;
1118
1119 case IB_CM_MRA_RECEIVED:
1120 printk(KERN_ERR PFX "MRA received\n");
1121 break;
1122
1123 case IB_CM_DREP_RECEIVED:
1124 break;
1125
1126 case IB_CM_TIMEWAIT_EXIT:
1127 printk(KERN_ERR PFX "connection closed\n");
1128
1129 comp = 1;
1130 target->status = 0;
1131 break;
1132
1133 default:
1134 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1135 break;
1136 }
1137
1138 if (comp)
1139 complete(&target->done);
1140
1141 kfree(qp_attr);
1142
1143 return 0;
1144 }
1145
1146 static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
1147 {
1148 struct srp_target_port *target = host_to_target(scmnd->device->host);
1149 struct srp_request *req;
1150 struct srp_iu *iu;
1151 struct srp_tsk_mgmt *tsk_mgmt;
1152 int req_index;
1153 int ret = FAILED;
1154
1155 spin_lock_irq(target->scsi_host->host_lock);
1156
1157 if (target->state == SRP_TARGET_DEAD ||
1158 target->state == SRP_TARGET_REMOVED) {
1159 scmnd->result = DID_BAD_TARGET << 16;
1160 goto out;
1161 }
1162
1163 if (scmnd->host_scribble == (void *) -1L)
1164 goto out;
1165
1166 req_index = (long) scmnd->host_scribble;
1167 printk(KERN_ERR "Abort for req_index %d\n", req_index);
1168
1169 req = &target->req_ring[req_index];
1170 init_completion(&req->done);
1171
1172 iu = __srp_get_tx_iu(target);
1173 if (!iu)
1174 goto out;
1175
1176 tsk_mgmt = iu->buf;
1177 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1178
1179 tsk_mgmt->opcode = SRP_TSK_MGMT;
1180 tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1181 tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
1182 tsk_mgmt->tsk_mgmt_func = func;
1183 tsk_mgmt->task_tag = req_index;
1184
1185 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1186 goto out;
1187
1188 req->tsk_mgmt = iu;
1189
1190 spin_unlock_irq(target->scsi_host->host_lock);
1191 if (!wait_for_completion_timeout(&req->done,
1192 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1193 return FAILED;
1194 spin_lock_irq(target->scsi_host->host_lock);
1195
1196 if (req->cmd_done) {
1197 srp_remove_req(target, req, req_index);
1198 scmnd->scsi_done(scmnd);
1199 } else if (!req->tsk_status) {
1200 srp_remove_req(target, req, req_index);
1201 scmnd->result = DID_ABORT << 16;
1202 ret = SUCCESS;
1203 }
1204
1205 out:
1206 spin_unlock_irq(target->scsi_host->host_lock);
1207 return ret;
1208 }
1209
1210 static int srp_abort(struct scsi_cmnd *scmnd)
1211 {
1212 printk(KERN_ERR "SRP abort called\n");
1213
1214 return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
1215 }
1216
1217 static int srp_reset_device(struct scsi_cmnd *scmnd)
1218 {
1219 printk(KERN_ERR "SRP reset_device called\n");
1220
1221 return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
1222 }
1223
1224 static int srp_reset_host(struct scsi_cmnd *scmnd)
1225 {
1226 struct srp_target_port *target = host_to_target(scmnd->device->host);
1227 int ret = FAILED;
1228
1229 printk(KERN_ERR PFX "SRP reset_host called\n");
1230
1231 if (!srp_reconnect_target(target))
1232 ret = SUCCESS;
1233
1234 return ret;
1235 }
1236
1237 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1238 {
1239 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1240
1241 if (target->state == SRP_TARGET_DEAD ||
1242 target->state == SRP_TARGET_REMOVED)
1243 return -ENODEV;
1244
1245 return sprintf(buf, "0x%016llx\n",
1246 (unsigned long long) be64_to_cpu(target->id_ext));
1247 }
1248
1249 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1250 {
1251 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1252
1253 if (target->state == SRP_TARGET_DEAD ||
1254 target->state == SRP_TARGET_REMOVED)
1255 return -ENODEV;
1256
1257 return sprintf(buf, "0x%016llx\n",
1258 (unsigned long long) be64_to_cpu(target->ioc_guid));
1259 }
1260
1261 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1262 {
1263 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1264
1265 if (target->state == SRP_TARGET_DEAD ||
1266 target->state == SRP_TARGET_REMOVED)
1267 return -ENODEV;
1268
1269 return sprintf(buf, "0x%016llx\n",
1270 (unsigned long long) be64_to_cpu(target->service_id));
1271 }
1272
1273 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1274 {
1275 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1276
1277 if (target->state == SRP_TARGET_DEAD ||
1278 target->state == SRP_TARGET_REMOVED)
1279 return -ENODEV;
1280
1281 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1282 }
1283
1284 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1285 {
1286 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1287
1288 if (target->state == SRP_TARGET_DEAD ||
1289 target->state == SRP_TARGET_REMOVED)
1290 return -ENODEV;
1291
1292 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1293 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1294 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1295 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1296 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1297 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1298 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1299 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1300 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1301 }
1302
1303 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1304 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1305 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1306 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1307 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1308
1309 static struct class_device_attribute *srp_host_attrs[] = {
1310 &class_device_attr_id_ext,
1311 &class_device_attr_ioc_guid,
1312 &class_device_attr_service_id,
1313 &class_device_attr_pkey,
1314 &class_device_attr_dgid,
1315 NULL
1316 };
1317
1318 static struct scsi_host_template srp_template = {
1319 .module = THIS_MODULE,
1320 .name = DRV_NAME,
1321 .info = srp_target_info,
1322 .queuecommand = srp_queuecommand,
1323 .eh_abort_handler = srp_abort,
1324 .eh_device_reset_handler = srp_reset_device,
1325 .eh_host_reset_handler = srp_reset_host,
1326 .can_queue = SRP_SQ_SIZE,
1327 .this_id = -1,
1328 .sg_tablesize = SRP_MAX_INDIRECT,
1329 .cmd_per_lun = SRP_SQ_SIZE,
1330 .use_clustering = ENABLE_CLUSTERING,
1331 .shost_attrs = srp_host_attrs
1332 };
1333
1334 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1335 {
1336 sprintf(target->target_name, "SRP.T10:%016llX",
1337 (unsigned long long) be64_to_cpu(target->id_ext));
1338
1339 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1340 return -ENODEV;
1341
1342 mutex_lock(&host->target_mutex);
1343 list_add_tail(&target->list, &host->target_list);
1344 mutex_unlock(&host->target_mutex);
1345
1346 target->state = SRP_TARGET_LIVE;
1347
1348 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1349 scsi_scan_target(&target->scsi_host->shost_gendev,
1350 0, target->scsi_id, ~0, 0);
1351
1352 return 0;
1353 }
1354
1355 static void srp_release_class_dev(struct class_device *class_dev)
1356 {
1357 struct srp_host *host =
1358 container_of(class_dev, struct srp_host, class_dev);
1359
1360 complete(&host->released);
1361 }
1362
1363 static struct class srp_class = {
1364 .name = "infiniband_srp",
1365 .release = srp_release_class_dev
1366 };
1367
1368 /*
1369 * Target ports are added by writing
1370 *
1371 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1372 * pkey=<P_Key>,service_id=<service ID>
1373 *
1374 * to the add_target sysfs attribute.
1375 */
1376 enum {
1377 SRP_OPT_ERR = 0,
1378 SRP_OPT_ID_EXT = 1 << 0,
1379 SRP_OPT_IOC_GUID = 1 << 1,
1380 SRP_OPT_DGID = 1 << 2,
1381 SRP_OPT_PKEY = 1 << 3,
1382 SRP_OPT_SERVICE_ID = 1 << 4,
1383 SRP_OPT_MAX_SECT = 1 << 5,
1384 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1385 SRP_OPT_IOC_GUID |
1386 SRP_OPT_DGID |
1387 SRP_OPT_PKEY |
1388 SRP_OPT_SERVICE_ID),
1389 };
1390
1391 static match_table_t srp_opt_tokens = {
1392 { SRP_OPT_ID_EXT, "id_ext=%s" },
1393 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1394 { SRP_OPT_DGID, "dgid=%s" },
1395 { SRP_OPT_PKEY, "pkey=%x" },
1396 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1397 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1398 { SRP_OPT_ERR, NULL }
1399 };
1400
1401 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1402 {
1403 char *options, *sep_opt;
1404 char *p;
1405 char dgid[3];
1406 substring_t args[MAX_OPT_ARGS];
1407 int opt_mask = 0;
1408 int token;
1409 int ret = -EINVAL;
1410 int i;
1411
1412 options = kstrdup(buf, GFP_KERNEL);
1413 if (!options)
1414 return -ENOMEM;
1415
1416 sep_opt = options;
1417 while ((p = strsep(&sep_opt, ",")) != NULL) {
1418 if (!*p)
1419 continue;
1420
1421 token = match_token(p, srp_opt_tokens, args);
1422 opt_mask |= token;
1423
1424 switch (token) {
1425 case SRP_OPT_ID_EXT:
1426 p = match_strdup(args);
1427 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1428 kfree(p);
1429 break;
1430
1431 case SRP_OPT_IOC_GUID:
1432 p = match_strdup(args);
1433 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1434 kfree(p);
1435 break;
1436
1437 case SRP_OPT_DGID:
1438 p = match_strdup(args);
1439 if (strlen(p) != 32) {
1440 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1441 kfree(p);
1442 goto out;
1443 }
1444
1445 for (i = 0; i < 16; ++i) {
1446 strlcpy(dgid, p + i * 2, 3);
1447 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1448 }
1449 kfree(p);
1450 break;
1451
1452 case SRP_OPT_PKEY:
1453 if (match_hex(args, &token)) {
1454 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1455 goto out;
1456 }
1457 target->path.pkey = cpu_to_be16(token);
1458 break;
1459
1460 case SRP_OPT_SERVICE_ID:
1461 p = match_strdup(args);
1462 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1463 kfree(p);
1464 break;
1465
1466 case SRP_OPT_MAX_SECT:
1467 if (match_int(args, &token)) {
1468 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1469 goto out;
1470 }
1471 target->scsi_host->max_sectors = token;
1472 break;
1473
1474 default:
1475 printk(KERN_WARNING PFX "unknown parameter or missing value "
1476 "'%s' in target creation request\n", p);
1477 goto out;
1478 }
1479 }
1480
1481 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1482 ret = 0;
1483 else
1484 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1485 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1486 !(srp_opt_tokens[i].token & opt_mask))
1487 printk(KERN_WARNING PFX "target creation request is "
1488 "missing parameter '%s'\n",
1489 srp_opt_tokens[i].pattern);
1490
1491 out:
1492 kfree(options);
1493 return ret;
1494 }
1495
1496 static ssize_t srp_create_target(struct class_device *class_dev,
1497 const char *buf, size_t count)
1498 {
1499 struct srp_host *host =
1500 container_of(class_dev, struct srp_host, class_dev);
1501 struct Scsi_Host *target_host;
1502 struct srp_target_port *target;
1503 int ret;
1504 int i;
1505
1506 target_host = scsi_host_alloc(&srp_template,
1507 sizeof (struct srp_target_port));
1508 if (!target_host)
1509 return -ENOMEM;
1510
1511 target_host->max_lun = SRP_MAX_LUN;
1512
1513 target = host_to_target(target_host);
1514 memset(target, 0, sizeof *target);
1515
1516 target->scsi_host = target_host;
1517 target->srp_host = host;
1518
1519 INIT_WORK(&target->work, srp_reconnect_work, target);
1520
1521 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
1522 target->req_ring[i].next = i + 1;
1523 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
1524 INIT_LIST_HEAD(&target->req_queue);
1525
1526 ret = srp_parse_options(buf, target);
1527 if (ret)
1528 goto err;
1529
1530 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1531
1532 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1533 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1534 (unsigned long long) be64_to_cpu(target->id_ext),
1535 (unsigned long long) be64_to_cpu(target->ioc_guid),
1536 be16_to_cpu(target->path.pkey),
1537 (unsigned long long) be64_to_cpu(target->service_id),
1538 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1539 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1540 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1541 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1542 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1543 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1544 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1545 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1546
1547 ret = srp_create_target_ib(target);
1548 if (ret)
1549 goto err;
1550
1551 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1552 if (IS_ERR(target->cm_id)) {
1553 ret = PTR_ERR(target->cm_id);
1554 goto err_free;
1555 }
1556
1557 ret = srp_connect_target(target);
1558 if (ret) {
1559 printk(KERN_ERR PFX "Connection failed\n");
1560 goto err_cm_id;
1561 }
1562
1563 ret = srp_add_target(host, target);
1564 if (ret)
1565 goto err_disconnect;
1566
1567 return count;
1568
1569 err_disconnect:
1570 srp_disconnect_target(target);
1571
1572 err_cm_id:
1573 ib_destroy_cm_id(target->cm_id);
1574
1575 err_free:
1576 srp_free_target_ib(target);
1577
1578 err:
1579 scsi_host_put(target_host);
1580
1581 return ret;
1582 }
1583
1584 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1585
1586 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1587 {
1588 struct srp_host *host =
1589 container_of(class_dev, struct srp_host, class_dev);
1590
1591 return sprintf(buf, "%s\n", host->dev->name);
1592 }
1593
1594 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1595
1596 static ssize_t show_port(struct class_device *class_dev, char *buf)
1597 {
1598 struct srp_host *host =
1599 container_of(class_dev, struct srp_host, class_dev);
1600
1601 return sprintf(buf, "%d\n", host->port);
1602 }
1603
1604 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1605
1606 static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
1607 {
1608 struct srp_host *host;
1609
1610 host = kzalloc(sizeof *host, GFP_KERNEL);
1611 if (!host)
1612 return NULL;
1613
1614 INIT_LIST_HEAD(&host->target_list);
1615 mutex_init(&host->target_mutex);
1616 init_completion(&host->released);
1617 host->dev = device;
1618 host->port = port;
1619
1620 host->initiator_port_id[7] = port;
1621 memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
1622
1623 host->pd = ib_alloc_pd(device);
1624 if (IS_ERR(host->pd))
1625 goto err_free;
1626
1627 host->mr = ib_get_dma_mr(host->pd,
1628 IB_ACCESS_LOCAL_WRITE |
1629 IB_ACCESS_REMOTE_READ |
1630 IB_ACCESS_REMOTE_WRITE);
1631 if (IS_ERR(host->mr))
1632 goto err_pd;
1633
1634 host->class_dev.class = &srp_class;
1635 host->class_dev.dev = device->dma_device;
1636 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1637 device->name, port);
1638
1639 if (class_device_register(&host->class_dev))
1640 goto err_mr;
1641 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1642 goto err_class;
1643 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1644 goto err_class;
1645 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1646 goto err_class;
1647
1648 return host;
1649
1650 err_class:
1651 class_device_unregister(&host->class_dev);
1652
1653 err_mr:
1654 ib_dereg_mr(host->mr);
1655
1656 err_pd:
1657 ib_dealloc_pd(host->pd);
1658
1659 err_free:
1660 kfree(host);
1661
1662 return NULL;
1663 }
1664
1665 static void srp_add_one(struct ib_device *device)
1666 {
1667 struct list_head *dev_list;
1668 struct srp_host *host;
1669 int s, e, p;
1670
1671 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1672 if (!dev_list)
1673 return;
1674
1675 INIT_LIST_HEAD(dev_list);
1676
1677 if (device->node_type == IB_NODE_SWITCH) {
1678 s = 0;
1679 e = 0;
1680 } else {
1681 s = 1;
1682 e = device->phys_port_cnt;
1683 }
1684
1685 for (p = s; p <= e; ++p) {
1686 host = srp_add_port(device, p);
1687 if (host)
1688 list_add_tail(&host->list, dev_list);
1689 }
1690
1691 ib_set_client_data(device, &srp_client, dev_list);
1692 }
1693
1694 static void srp_remove_one(struct ib_device *device)
1695 {
1696 struct list_head *dev_list;
1697 struct srp_host *host, *tmp_host;
1698 LIST_HEAD(target_list);
1699 struct srp_target_port *target, *tmp_target;
1700 unsigned long flags;
1701
1702 dev_list = ib_get_client_data(device, &srp_client);
1703
1704 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1705 class_device_unregister(&host->class_dev);
1706 /*
1707 * Wait for the sysfs entry to go away, so that no new
1708 * target ports can be created.
1709 */
1710 wait_for_completion(&host->released);
1711
1712 /*
1713 * Mark all target ports as removed, so we stop queueing
1714 * commands and don't try to reconnect.
1715 */
1716 mutex_lock(&host->target_mutex);
1717 list_for_each_entry_safe(target, tmp_target,
1718 &host->target_list, list) {
1719 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1720 if (target->state != SRP_TARGET_REMOVED)
1721 target->state = SRP_TARGET_REMOVED;
1722 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1723 }
1724 mutex_unlock(&host->target_mutex);
1725
1726 /*
1727 * Wait for any reconnection tasks that may have
1728 * started before we marked our target ports as
1729 * removed, and any target port removal tasks.
1730 */
1731 flush_scheduled_work();
1732
1733 list_for_each_entry_safe(target, tmp_target,
1734 &host->target_list, list) {
1735 scsi_remove_host(target->scsi_host);
1736 srp_disconnect_target(target);
1737 ib_destroy_cm_id(target->cm_id);
1738 srp_free_target_ib(target);
1739 scsi_host_put(target->scsi_host);
1740 }
1741
1742 ib_dereg_mr(host->mr);
1743 ib_dealloc_pd(host->pd);
1744 kfree(host);
1745 }
1746
1747 kfree(dev_list);
1748 }
1749
1750 static int __init srp_init_module(void)
1751 {
1752 int ret;
1753
1754 ret = class_register(&srp_class);
1755 if (ret) {
1756 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1757 return ret;
1758 }
1759
1760 ret = ib_register_client(&srp_client);
1761 if (ret) {
1762 printk(KERN_ERR PFX "couldn't register IB client\n");
1763 class_unregister(&srp_class);
1764 return ret;
1765 }
1766
1767 return 0;
1768 }
1769
1770 static void __exit srp_cleanup_module(void)
1771 {
1772 ib_unregister_client(&srp_client);
1773 class_unregister(&srp_class);
1774 }
1775
1776 module_init(srp_init_module);
1777 module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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