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Merge master.kernel.org:/home/rmk/linux-2.6-serial
[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 = (struct scatterlist *) scmnd->request_buffer;
611 } else {
612 nents = 1;
613 scat = (struct scatterlist *) scmnd->request_buffer;
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_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
621 {
622 struct srp_request *req;
623 struct scsi_cmnd *scmnd;
624 unsigned long flags;
625 s32 delta;
626
627 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
628
629 spin_lock_irqsave(target->scsi_host->host_lock, flags);
630
631 target->req_lim += delta;
632
633 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
634
635 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
636 if (be32_to_cpu(rsp->resp_data_len) < 4)
637 req->tsk_status = -1;
638 else
639 req->tsk_status = rsp->data[3];
640 complete(&req->done);
641 } else {
642 scmnd = req->scmnd;
643 if (!scmnd)
644 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
645 (unsigned long long) rsp->tag);
646 scmnd->result = rsp->status;
647
648 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
649 memcpy(scmnd->sense_buffer, rsp->data +
650 be32_to_cpu(rsp->resp_data_len),
651 min_t(int, be32_to_cpu(rsp->sense_data_len),
652 SCSI_SENSE_BUFFERSIZE));
653 }
654
655 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
656 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
657 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
658 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
659
660 srp_unmap_data(scmnd, target, req);
661
662 if (!req->tsk_mgmt) {
663 req->scmnd = NULL;
664 scmnd->host_scribble = (void *) -1L;
665 scmnd->scsi_done(scmnd);
666
667 list_del(&req->list);
668 req->next = target->req_head;
669 target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
670 } else
671 req->cmd_done = 1;
672 }
673
674 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
675 }
676
677 static void srp_reconnect_work(void *target_ptr)
678 {
679 struct srp_target_port *target = target_ptr;
680
681 srp_reconnect_target(target);
682 }
683
684 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
685 {
686 struct srp_iu *iu;
687 u8 opcode;
688
689 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
690
691 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
692 target->max_ti_iu_len, DMA_FROM_DEVICE);
693
694 opcode = *(u8 *) iu->buf;
695
696 if (0) {
697 int i;
698
699 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
700
701 for (i = 0; i < wc->byte_len; ++i) {
702 if (i % 8 == 0)
703 printk(KERN_ERR " [%02x] ", i);
704 printk(" %02x", ((u8 *) iu->buf)[i]);
705 if ((i + 1) % 8 == 0)
706 printk("\n");
707 }
708
709 if (wc->byte_len % 8)
710 printk("\n");
711 }
712
713 switch (opcode) {
714 case SRP_RSP:
715 srp_process_rsp(target, iu->buf);
716 break;
717
718 case SRP_T_LOGOUT:
719 /* XXX Handle target logout */
720 printk(KERN_WARNING PFX "Got target logout request\n");
721 break;
722
723 default:
724 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
725 break;
726 }
727
728 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
729 target->max_ti_iu_len, DMA_FROM_DEVICE);
730 }
731
732 static void srp_completion(struct ib_cq *cq, void *target_ptr)
733 {
734 struct srp_target_port *target = target_ptr;
735 struct ib_wc wc;
736 unsigned long flags;
737
738 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
739 while (ib_poll_cq(cq, 1, &wc) > 0) {
740 if (wc.status) {
741 printk(KERN_ERR PFX "failed %s status %d\n",
742 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
743 wc.status);
744 spin_lock_irqsave(target->scsi_host->host_lock, flags);
745 if (target->state == SRP_TARGET_LIVE)
746 schedule_work(&target->work);
747 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
748 break;
749 }
750
751 if (wc.wr_id & SRP_OP_RECV)
752 srp_handle_recv(target, &wc);
753 else
754 ++target->tx_tail;
755 }
756 }
757
758 static int __srp_post_recv(struct srp_target_port *target)
759 {
760 struct srp_iu *iu;
761 struct ib_sge list;
762 struct ib_recv_wr wr, *bad_wr;
763 unsigned int next;
764 int ret;
765
766 next = target->rx_head & (SRP_RQ_SIZE - 1);
767 wr.wr_id = next | SRP_OP_RECV;
768 iu = target->rx_ring[next];
769
770 list.addr = iu->dma;
771 list.length = iu->size;
772 list.lkey = target->srp_host->mr->lkey;
773
774 wr.next = NULL;
775 wr.sg_list = &list;
776 wr.num_sge = 1;
777
778 ret = ib_post_recv(target->qp, &wr, &bad_wr);
779 if (!ret)
780 ++target->rx_head;
781
782 return ret;
783 }
784
785 static int srp_post_recv(struct srp_target_port *target)
786 {
787 unsigned long flags;
788 int ret;
789
790 spin_lock_irqsave(target->scsi_host->host_lock, flags);
791 ret = __srp_post_recv(target);
792 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
793
794 return ret;
795 }
796
797 /*
798 * Must be called with target->scsi_host->host_lock held to protect
799 * req_lim and tx_head. Lock cannot be dropped between call here and
800 * call to __srp_post_send().
801 */
802 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
803 {
804 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
805 return NULL;
806
807 if (unlikely(target->req_lim < 1)) {
808 if (printk_ratelimit())
809 printk(KERN_DEBUG PFX "Target has req_lim %d\n",
810 target->req_lim);
811 return NULL;
812 }
813
814 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
815 }
816
817 /*
818 * Must be called with target->scsi_host->host_lock held to protect
819 * req_lim and tx_head.
820 */
821 static int __srp_post_send(struct srp_target_port *target,
822 struct srp_iu *iu, int len)
823 {
824 struct ib_sge list;
825 struct ib_send_wr wr, *bad_wr;
826 int ret = 0;
827
828 list.addr = iu->dma;
829 list.length = len;
830 list.lkey = target->srp_host->mr->lkey;
831
832 wr.next = NULL;
833 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
834 wr.sg_list = &list;
835 wr.num_sge = 1;
836 wr.opcode = IB_WR_SEND;
837 wr.send_flags = IB_SEND_SIGNALED;
838
839 ret = ib_post_send(target->qp, &wr, &bad_wr);
840
841 if (!ret) {
842 ++target->tx_head;
843 --target->req_lim;
844 }
845
846 return ret;
847 }
848
849 static int srp_queuecommand(struct scsi_cmnd *scmnd,
850 void (*done)(struct scsi_cmnd *))
851 {
852 struct srp_target_port *target = host_to_target(scmnd->device->host);
853 struct srp_request *req;
854 struct srp_iu *iu;
855 struct srp_cmd *cmd;
856 long req_index;
857 int len;
858
859 if (target->state == SRP_TARGET_CONNECTING)
860 goto err;
861
862 if (target->state == SRP_TARGET_DEAD ||
863 target->state == SRP_TARGET_REMOVED) {
864 scmnd->result = DID_BAD_TARGET << 16;
865 done(scmnd);
866 return 0;
867 }
868
869 iu = __srp_get_tx_iu(target);
870 if (!iu)
871 goto err;
872
873 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
874 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
875
876 req_index = target->req_head;
877
878 scmnd->scsi_done = done;
879 scmnd->result = 0;
880 scmnd->host_scribble = (void *) req_index;
881
882 cmd = iu->buf;
883 memset(cmd, 0, sizeof *cmd);
884
885 cmd->opcode = SRP_CMD;
886 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
887 cmd->tag = req_index;
888 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
889
890 req = &target->req_ring[req_index];
891
892 req->scmnd = scmnd;
893 req->cmd = iu;
894 req->cmd_done = 0;
895 req->tsk_mgmt = NULL;
896
897 len = srp_map_data(scmnd, target, req);
898 if (len < 0) {
899 printk(KERN_ERR PFX "Failed to map data\n");
900 goto err;
901 }
902
903 if (__srp_post_recv(target)) {
904 printk(KERN_ERR PFX "Recv failed\n");
905 goto err_unmap;
906 }
907
908 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
909 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
910
911 if (__srp_post_send(target, iu, len)) {
912 printk(KERN_ERR PFX "Send failed\n");
913 goto err_unmap;
914 }
915
916 target->req_head = req->next;
917 list_add_tail(&req->list, &target->req_queue);
918
919 return 0;
920
921 err_unmap:
922 srp_unmap_data(scmnd, target, req);
923
924 err:
925 return SCSI_MLQUEUE_HOST_BUSY;
926 }
927
928 static int srp_alloc_iu_bufs(struct srp_target_port *target)
929 {
930 int i;
931
932 for (i = 0; i < SRP_RQ_SIZE; ++i) {
933 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
934 target->max_ti_iu_len,
935 GFP_KERNEL, DMA_FROM_DEVICE);
936 if (!target->rx_ring[i])
937 goto err;
938 }
939
940 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
941 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
942 SRP_MAX_IU_LEN,
943 GFP_KERNEL, DMA_TO_DEVICE);
944 if (!target->tx_ring[i])
945 goto err;
946 }
947
948 return 0;
949
950 err:
951 for (i = 0; i < SRP_RQ_SIZE; ++i) {
952 srp_free_iu(target->srp_host, target->rx_ring[i]);
953 target->rx_ring[i] = NULL;
954 }
955
956 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
957 srp_free_iu(target->srp_host, target->tx_ring[i]);
958 target->tx_ring[i] = NULL;
959 }
960
961 return -ENOMEM;
962 }
963
964 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
965 struct ib_cm_event *event,
966 struct srp_target_port *target)
967 {
968 struct ib_class_port_info *cpi;
969 int opcode;
970
971 switch (event->param.rej_rcvd.reason) {
972 case IB_CM_REJ_PORT_CM_REDIRECT:
973 cpi = event->param.rej_rcvd.ari;
974 target->path.dlid = cpi->redirect_lid;
975 target->path.pkey = cpi->redirect_pkey;
976 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
977 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
978
979 target->status = target->path.dlid ?
980 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
981 break;
982
983 case IB_CM_REJ_PORT_REDIRECT:
984 if (topspin_workarounds &&
985 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
986 /*
987 * Topspin/Cisco SRP gateways incorrectly send
988 * reject reason code 25 when they mean 24
989 * (port redirect).
990 */
991 memcpy(target->path.dgid.raw,
992 event->param.rej_rcvd.ari, 16);
993
994 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
995 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
996 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
997
998 target->status = SRP_PORT_REDIRECT;
999 } else {
1000 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1001 target->status = -ECONNRESET;
1002 }
1003 break;
1004
1005 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1006 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1007 target->status = -ECONNRESET;
1008 break;
1009
1010 case IB_CM_REJ_CONSUMER_DEFINED:
1011 opcode = *(u8 *) event->private_data;
1012 if (opcode == SRP_LOGIN_REJ) {
1013 struct srp_login_rej *rej = event->private_data;
1014 u32 reason = be32_to_cpu(rej->reason);
1015
1016 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1017 printk(KERN_WARNING PFX
1018 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1019 else
1020 printk(KERN_WARNING PFX
1021 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1022 } else
1023 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1024 " opcode 0x%02x\n", opcode);
1025 target->status = -ECONNRESET;
1026 break;
1027
1028 default:
1029 printk(KERN_WARNING " REJ reason 0x%x\n",
1030 event->param.rej_rcvd.reason);
1031 target->status = -ECONNRESET;
1032 }
1033 }
1034
1035 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1036 {
1037 struct srp_target_port *target = cm_id->context;
1038 struct ib_qp_attr *qp_attr = NULL;
1039 int attr_mask = 0;
1040 int comp = 0;
1041 int opcode = 0;
1042
1043 switch (event->event) {
1044 case IB_CM_REQ_ERROR:
1045 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1046 comp = 1;
1047 target->status = -ECONNRESET;
1048 break;
1049
1050 case IB_CM_REP_RECEIVED:
1051 comp = 1;
1052 opcode = *(u8 *) event->private_data;
1053
1054 if (opcode == SRP_LOGIN_RSP) {
1055 struct srp_login_rsp *rsp = event->private_data;
1056
1057 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1058 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1059
1060 target->scsi_host->can_queue = min(target->req_lim,
1061 target->scsi_host->can_queue);
1062 } else {
1063 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1064 target->status = -ECONNRESET;
1065 break;
1066 }
1067
1068 target->status = srp_alloc_iu_bufs(target);
1069 if (target->status)
1070 break;
1071
1072 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1073 if (!qp_attr) {
1074 target->status = -ENOMEM;
1075 break;
1076 }
1077
1078 qp_attr->qp_state = IB_QPS_RTR;
1079 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1080 if (target->status)
1081 break;
1082
1083 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1084 if (target->status)
1085 break;
1086
1087 target->status = srp_post_recv(target);
1088 if (target->status)
1089 break;
1090
1091 qp_attr->qp_state = IB_QPS_RTS;
1092 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1093 if (target->status)
1094 break;
1095
1096 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1097 if (target->status)
1098 break;
1099
1100 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1101 if (target->status)
1102 break;
1103
1104 break;
1105
1106 case IB_CM_REJ_RECEIVED:
1107 printk(KERN_DEBUG PFX "REJ received\n");
1108 comp = 1;
1109
1110 srp_cm_rej_handler(cm_id, event, target);
1111 break;
1112
1113 case IB_CM_MRA_RECEIVED:
1114 printk(KERN_ERR PFX "MRA received\n");
1115 break;
1116
1117 case IB_CM_DREP_RECEIVED:
1118 break;
1119
1120 case IB_CM_TIMEWAIT_EXIT:
1121 printk(KERN_ERR PFX "connection closed\n");
1122
1123 comp = 1;
1124 target->status = 0;
1125 break;
1126
1127 default:
1128 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1129 break;
1130 }
1131
1132 if (comp)
1133 complete(&target->done);
1134
1135 kfree(qp_attr);
1136
1137 return 0;
1138 }
1139
1140 static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
1141 {
1142 struct srp_target_port *target = host_to_target(scmnd->device->host);
1143 struct srp_request *req;
1144 struct srp_iu *iu;
1145 struct srp_tsk_mgmt *tsk_mgmt;
1146 int req_index;
1147 int ret = FAILED;
1148
1149 spin_lock_irq(target->scsi_host->host_lock);
1150
1151 if (target->state == SRP_TARGET_DEAD ||
1152 target->state == SRP_TARGET_REMOVED) {
1153 scmnd->result = DID_BAD_TARGET << 16;
1154 goto out;
1155 }
1156
1157 if (scmnd->host_scribble == (void *) -1L)
1158 goto out;
1159
1160 req_index = (long) scmnd->host_scribble;
1161 printk(KERN_ERR "Abort for req_index %d\n", req_index);
1162
1163 req = &target->req_ring[req_index];
1164 init_completion(&req->done);
1165
1166 iu = __srp_get_tx_iu(target);
1167 if (!iu)
1168 goto out;
1169
1170 tsk_mgmt = iu->buf;
1171 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1172
1173 tsk_mgmt->opcode = SRP_TSK_MGMT;
1174 tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1175 tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
1176 tsk_mgmt->tsk_mgmt_func = func;
1177 tsk_mgmt->task_tag = req_index;
1178
1179 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1180 goto out;
1181
1182 req->tsk_mgmt = iu;
1183
1184 spin_unlock_irq(target->scsi_host->host_lock);
1185 if (!wait_for_completion_timeout(&req->done,
1186 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1187 return FAILED;
1188 spin_lock_irq(target->scsi_host->host_lock);
1189
1190 if (req->cmd_done) {
1191 list_del(&req->list);
1192 req->next = target->req_head;
1193 target->req_head = req_index;
1194
1195 scmnd->scsi_done(scmnd);
1196 } else if (!req->tsk_status) {
1197 scmnd->result = DID_ABORT << 16;
1198 ret = SUCCESS;
1199 }
1200
1201 out:
1202 spin_unlock_irq(target->scsi_host->host_lock);
1203 return ret;
1204 }
1205
1206 static int srp_abort(struct scsi_cmnd *scmnd)
1207 {
1208 printk(KERN_ERR "SRP abort called\n");
1209
1210 return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
1211 }
1212
1213 static int srp_reset_device(struct scsi_cmnd *scmnd)
1214 {
1215 printk(KERN_ERR "SRP reset_device called\n");
1216
1217 return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
1218 }
1219
1220 static int srp_reset_host(struct scsi_cmnd *scmnd)
1221 {
1222 struct srp_target_port *target = host_to_target(scmnd->device->host);
1223 int ret = FAILED;
1224
1225 printk(KERN_ERR PFX "SRP reset_host called\n");
1226
1227 if (!srp_reconnect_target(target))
1228 ret = SUCCESS;
1229
1230 return ret;
1231 }
1232
1233 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1234 {
1235 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1236
1237 if (target->state == SRP_TARGET_DEAD ||
1238 target->state == SRP_TARGET_REMOVED)
1239 return -ENODEV;
1240
1241 return sprintf(buf, "0x%016llx\n",
1242 (unsigned long long) be64_to_cpu(target->id_ext));
1243 }
1244
1245 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1246 {
1247 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1248
1249 if (target->state == SRP_TARGET_DEAD ||
1250 target->state == SRP_TARGET_REMOVED)
1251 return -ENODEV;
1252
1253 return sprintf(buf, "0x%016llx\n",
1254 (unsigned long long) be64_to_cpu(target->ioc_guid));
1255 }
1256
1257 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1258 {
1259 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1260
1261 if (target->state == SRP_TARGET_DEAD ||
1262 target->state == SRP_TARGET_REMOVED)
1263 return -ENODEV;
1264
1265 return sprintf(buf, "0x%016llx\n",
1266 (unsigned long long) be64_to_cpu(target->service_id));
1267 }
1268
1269 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1270 {
1271 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1272
1273 if (target->state == SRP_TARGET_DEAD ||
1274 target->state == SRP_TARGET_REMOVED)
1275 return -ENODEV;
1276
1277 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1278 }
1279
1280 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1281 {
1282 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1283
1284 if (target->state == SRP_TARGET_DEAD ||
1285 target->state == SRP_TARGET_REMOVED)
1286 return -ENODEV;
1287
1288 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1289 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1290 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1291 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1292 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1293 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1294 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1295 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1296 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1297 }
1298
1299 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1300 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1301 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1302 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1303 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1304
1305 static struct class_device_attribute *srp_host_attrs[] = {
1306 &class_device_attr_id_ext,
1307 &class_device_attr_ioc_guid,
1308 &class_device_attr_service_id,
1309 &class_device_attr_pkey,
1310 &class_device_attr_dgid,
1311 NULL
1312 };
1313
1314 static struct scsi_host_template srp_template = {
1315 .module = THIS_MODULE,
1316 .name = DRV_NAME,
1317 .info = srp_target_info,
1318 .queuecommand = srp_queuecommand,
1319 .eh_abort_handler = srp_abort,
1320 .eh_device_reset_handler = srp_reset_device,
1321 .eh_host_reset_handler = srp_reset_host,
1322 .can_queue = SRP_SQ_SIZE,
1323 .this_id = -1,
1324 .sg_tablesize = SRP_MAX_INDIRECT,
1325 .cmd_per_lun = SRP_SQ_SIZE,
1326 .use_clustering = ENABLE_CLUSTERING,
1327 .shost_attrs = srp_host_attrs
1328 };
1329
1330 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1331 {
1332 sprintf(target->target_name, "SRP.T10:%016llX",
1333 (unsigned long long) be64_to_cpu(target->id_ext));
1334
1335 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1336 return -ENODEV;
1337
1338 mutex_lock(&host->target_mutex);
1339 list_add_tail(&target->list, &host->target_list);
1340 mutex_unlock(&host->target_mutex);
1341
1342 target->state = SRP_TARGET_LIVE;
1343
1344 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1345 scsi_scan_target(&target->scsi_host->shost_gendev,
1346 0, target->scsi_id, ~0, 0);
1347
1348 return 0;
1349 }
1350
1351 static void srp_release_class_dev(struct class_device *class_dev)
1352 {
1353 struct srp_host *host =
1354 container_of(class_dev, struct srp_host, class_dev);
1355
1356 complete(&host->released);
1357 }
1358
1359 static struct class srp_class = {
1360 .name = "infiniband_srp",
1361 .release = srp_release_class_dev
1362 };
1363
1364 /*
1365 * Target ports are added by writing
1366 *
1367 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1368 * pkey=<P_Key>,service_id=<service ID>
1369 *
1370 * to the add_target sysfs attribute.
1371 */
1372 enum {
1373 SRP_OPT_ERR = 0,
1374 SRP_OPT_ID_EXT = 1 << 0,
1375 SRP_OPT_IOC_GUID = 1 << 1,
1376 SRP_OPT_DGID = 1 << 2,
1377 SRP_OPT_PKEY = 1 << 3,
1378 SRP_OPT_SERVICE_ID = 1 << 4,
1379 SRP_OPT_MAX_SECT = 1 << 5,
1380 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1381 SRP_OPT_IOC_GUID |
1382 SRP_OPT_DGID |
1383 SRP_OPT_PKEY |
1384 SRP_OPT_SERVICE_ID),
1385 };
1386
1387 static match_table_t srp_opt_tokens = {
1388 { SRP_OPT_ID_EXT, "id_ext=%s" },
1389 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1390 { SRP_OPT_DGID, "dgid=%s" },
1391 { SRP_OPT_PKEY, "pkey=%x" },
1392 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1393 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1394 { SRP_OPT_ERR, NULL }
1395 };
1396
1397 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1398 {
1399 char *options, *sep_opt;
1400 char *p;
1401 char dgid[3];
1402 substring_t args[MAX_OPT_ARGS];
1403 int opt_mask = 0;
1404 int token;
1405 int ret = -EINVAL;
1406 int i;
1407
1408 options = kstrdup(buf, GFP_KERNEL);
1409 if (!options)
1410 return -ENOMEM;
1411
1412 sep_opt = options;
1413 while ((p = strsep(&sep_opt, ",")) != NULL) {
1414 if (!*p)
1415 continue;
1416
1417 token = match_token(p, srp_opt_tokens, args);
1418 opt_mask |= token;
1419
1420 switch (token) {
1421 case SRP_OPT_ID_EXT:
1422 p = match_strdup(args);
1423 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1424 kfree(p);
1425 break;
1426
1427 case SRP_OPT_IOC_GUID:
1428 p = match_strdup(args);
1429 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1430 kfree(p);
1431 break;
1432
1433 case SRP_OPT_DGID:
1434 p = match_strdup(args);
1435 if (strlen(p) != 32) {
1436 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1437 goto out;
1438 }
1439
1440 for (i = 0; i < 16; ++i) {
1441 strlcpy(dgid, p + i * 2, 3);
1442 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1443 }
1444 kfree(p);
1445 break;
1446
1447 case SRP_OPT_PKEY:
1448 if (match_hex(args, &token)) {
1449 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1450 goto out;
1451 }
1452 target->path.pkey = cpu_to_be16(token);
1453 break;
1454
1455 case SRP_OPT_SERVICE_ID:
1456 p = match_strdup(args);
1457 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1458 kfree(p);
1459 break;
1460
1461 case SRP_OPT_MAX_SECT:
1462 if (match_int(args, &token)) {
1463 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1464 goto out;
1465 }
1466 target->scsi_host->max_sectors = token;
1467 break;
1468
1469 default:
1470 printk(KERN_WARNING PFX "unknown parameter or missing value "
1471 "'%s' in target creation request\n", p);
1472 goto out;
1473 }
1474 }
1475
1476 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1477 ret = 0;
1478 else
1479 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1480 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1481 !(srp_opt_tokens[i].token & opt_mask))
1482 printk(KERN_WARNING PFX "target creation request is "
1483 "missing parameter '%s'\n",
1484 srp_opt_tokens[i].pattern);
1485
1486 out:
1487 kfree(options);
1488 return ret;
1489 }
1490
1491 static ssize_t srp_create_target(struct class_device *class_dev,
1492 const char *buf, size_t count)
1493 {
1494 struct srp_host *host =
1495 container_of(class_dev, struct srp_host, class_dev);
1496 struct Scsi_Host *target_host;
1497 struct srp_target_port *target;
1498 int ret;
1499 int i;
1500
1501 target_host = scsi_host_alloc(&srp_template,
1502 sizeof (struct srp_target_port));
1503 if (!target_host)
1504 return -ENOMEM;
1505
1506 target_host->max_lun = SRP_MAX_LUN;
1507
1508 target = host_to_target(target_host);
1509 memset(target, 0, sizeof *target);
1510
1511 target->scsi_host = target_host;
1512 target->srp_host = host;
1513
1514 INIT_WORK(&target->work, srp_reconnect_work, target);
1515
1516 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
1517 target->req_ring[i].next = i + 1;
1518 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
1519 INIT_LIST_HEAD(&target->req_queue);
1520
1521 ret = srp_parse_options(buf, target);
1522 if (ret)
1523 goto err;
1524
1525 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1526
1527 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1528 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1529 (unsigned long long) be64_to_cpu(target->id_ext),
1530 (unsigned long long) be64_to_cpu(target->ioc_guid),
1531 be16_to_cpu(target->path.pkey),
1532 (unsigned long long) be64_to_cpu(target->service_id),
1533 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1534 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1535 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1536 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1537 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1538 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1539 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1540 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1541
1542 ret = srp_create_target_ib(target);
1543 if (ret)
1544 goto err;
1545
1546 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1547 if (IS_ERR(target->cm_id)) {
1548 ret = PTR_ERR(target->cm_id);
1549 goto err_free;
1550 }
1551
1552 ret = srp_connect_target(target);
1553 if (ret) {
1554 printk(KERN_ERR PFX "Connection failed\n");
1555 goto err_cm_id;
1556 }
1557
1558 ret = srp_add_target(host, target);
1559 if (ret)
1560 goto err_disconnect;
1561
1562 return count;
1563
1564 err_disconnect:
1565 srp_disconnect_target(target);
1566
1567 err_cm_id:
1568 ib_destroy_cm_id(target->cm_id);
1569
1570 err_free:
1571 srp_free_target_ib(target);
1572
1573 err:
1574 scsi_host_put(target_host);
1575
1576 return ret;
1577 }
1578
1579 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1580
1581 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1582 {
1583 struct srp_host *host =
1584 container_of(class_dev, struct srp_host, class_dev);
1585
1586 return sprintf(buf, "%s\n", host->dev->name);
1587 }
1588
1589 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1590
1591 static ssize_t show_port(struct class_device *class_dev, char *buf)
1592 {
1593 struct srp_host *host =
1594 container_of(class_dev, struct srp_host, class_dev);
1595
1596 return sprintf(buf, "%d\n", host->port);
1597 }
1598
1599 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1600
1601 static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
1602 {
1603 struct srp_host *host;
1604
1605 host = kzalloc(sizeof *host, GFP_KERNEL);
1606 if (!host)
1607 return NULL;
1608
1609 INIT_LIST_HEAD(&host->target_list);
1610 mutex_init(&host->target_mutex);
1611 init_completion(&host->released);
1612 host->dev = device;
1613 host->port = port;
1614
1615 host->initiator_port_id[7] = port;
1616 memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
1617
1618 host->pd = ib_alloc_pd(device);
1619 if (IS_ERR(host->pd))
1620 goto err_free;
1621
1622 host->mr = ib_get_dma_mr(host->pd,
1623 IB_ACCESS_LOCAL_WRITE |
1624 IB_ACCESS_REMOTE_READ |
1625 IB_ACCESS_REMOTE_WRITE);
1626 if (IS_ERR(host->mr))
1627 goto err_pd;
1628
1629 host->class_dev.class = &srp_class;
1630 host->class_dev.dev = device->dma_device;
1631 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1632 device->name, port);
1633
1634 if (class_device_register(&host->class_dev))
1635 goto err_mr;
1636 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1637 goto err_class;
1638 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1639 goto err_class;
1640 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1641 goto err_class;
1642
1643 return host;
1644
1645 err_class:
1646 class_device_unregister(&host->class_dev);
1647
1648 err_mr:
1649 ib_dereg_mr(host->mr);
1650
1651 err_pd:
1652 ib_dealloc_pd(host->pd);
1653
1654 err_free:
1655 kfree(host);
1656
1657 return NULL;
1658 }
1659
1660 static void srp_add_one(struct ib_device *device)
1661 {
1662 struct list_head *dev_list;
1663 struct srp_host *host;
1664 int s, e, p;
1665
1666 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1667 if (!dev_list)
1668 return;
1669
1670 INIT_LIST_HEAD(dev_list);
1671
1672 if (device->node_type == IB_NODE_SWITCH) {
1673 s = 0;
1674 e = 0;
1675 } else {
1676 s = 1;
1677 e = device->phys_port_cnt;
1678 }
1679
1680 for (p = s; p <= e; ++p) {
1681 host = srp_add_port(device, p);
1682 if (host)
1683 list_add_tail(&host->list, dev_list);
1684 }
1685
1686 ib_set_client_data(device, &srp_client, dev_list);
1687 }
1688
1689 static void srp_remove_one(struct ib_device *device)
1690 {
1691 struct list_head *dev_list;
1692 struct srp_host *host, *tmp_host;
1693 LIST_HEAD(target_list);
1694 struct srp_target_port *target, *tmp_target;
1695 unsigned long flags;
1696
1697 dev_list = ib_get_client_data(device, &srp_client);
1698
1699 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1700 class_device_unregister(&host->class_dev);
1701 /*
1702 * Wait for the sysfs entry to go away, so that no new
1703 * target ports can be created.
1704 */
1705 wait_for_completion(&host->released);
1706
1707 /*
1708 * Mark all target ports as removed, so we stop queueing
1709 * commands and don't try to reconnect.
1710 */
1711 mutex_lock(&host->target_mutex);
1712 list_for_each_entry_safe(target, tmp_target,
1713 &host->target_list, list) {
1714 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1715 if (target->state != SRP_TARGET_REMOVED)
1716 target->state = SRP_TARGET_REMOVED;
1717 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1718 }
1719 mutex_unlock(&host->target_mutex);
1720
1721 /*
1722 * Wait for any reconnection tasks that may have
1723 * started before we marked our target ports as
1724 * removed, and any target port removal tasks.
1725 */
1726 flush_scheduled_work();
1727
1728 list_for_each_entry_safe(target, tmp_target,
1729 &host->target_list, list) {
1730 scsi_remove_host(target->scsi_host);
1731 srp_disconnect_target(target);
1732 ib_destroy_cm_id(target->cm_id);
1733 srp_free_target_ib(target);
1734 scsi_host_put(target->scsi_host);
1735 }
1736
1737 ib_dereg_mr(host->mr);
1738 ib_dealloc_pd(host->pd);
1739 kfree(host);
1740 }
1741
1742 kfree(dev_list);
1743 }
1744
1745 static int __init srp_init_module(void)
1746 {
1747 int ret;
1748
1749 ret = class_register(&srp_class);
1750 if (ret) {
1751 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1752 return ret;
1753 }
1754
1755 ret = ib_register_client(&srp_client);
1756 if (ret) {
1757 printk(KERN_ERR PFX "couldn't register IB client\n");
1758 class_unregister(&srp_class);
1759 return ret;
1760 }
1761
1762 return 0;
1763 }
1764
1765 static void __exit srp_cleanup_module(void)
1766 {
1767 ib_unregister_client(&srp_client);
1768 class_unregister(&srp_class);
1769 }
1770
1771 module_init(srp_init_module);
1772 module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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