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Pull altix-ce1.0-asic into release branch
[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 srp_cmd *cmd = req->cmd->buf;
507 int len;
508 u8 fmt;
509
510 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
511 return sizeof (struct srp_cmd);
512
513 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
514 scmnd->sc_data_direction != DMA_TO_DEVICE) {
515 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
516 scmnd->sc_data_direction);
517 return -EINVAL;
518 }
519
520 if (scmnd->use_sg) {
521 struct scatterlist *scat = scmnd->request_buffer;
522 int n;
523 int i;
524
525 n = dma_map_sg(target->srp_host->dev->dma_device,
526 scat, scmnd->use_sg, scmnd->sc_data_direction);
527
528 if (n == 1) {
529 struct srp_direct_buf *buf = (void *) cmd->add_data;
530
531 fmt = SRP_DATA_DESC_DIRECT;
532
533 buf->va = cpu_to_be64(sg_dma_address(scat));
534 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
535 buf->len = cpu_to_be32(sg_dma_len(scat));
536
537 len = sizeof (struct srp_cmd) +
538 sizeof (struct srp_direct_buf);
539 } else {
540 struct srp_indirect_buf *buf = (void *) cmd->add_data;
541 u32 datalen = 0;
542
543 fmt = SRP_DATA_DESC_INDIRECT;
544
545 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
546 cmd->data_out_desc_cnt = n;
547 else
548 cmd->data_in_desc_cnt = n;
549
550 buf->table_desc.va = cpu_to_be64(req->cmd->dma +
551 sizeof *cmd +
552 sizeof *buf);
553 buf->table_desc.key =
554 cpu_to_be32(target->srp_host->mr->rkey);
555 buf->table_desc.len =
556 cpu_to_be32(n * sizeof (struct srp_direct_buf));
557
558 for (i = 0; i < n; ++i) {
559 buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
560 buf->desc_list[i].key =
561 cpu_to_be32(target->srp_host->mr->rkey);
562 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
563
564 datalen += sg_dma_len(&scat[i]);
565 }
566
567 buf->len = cpu_to_be32(datalen);
568
569 len = sizeof (struct srp_cmd) +
570 sizeof (struct srp_indirect_buf) +
571 n * sizeof (struct srp_direct_buf);
572 }
573 } else {
574 struct srp_direct_buf *buf = (void *) cmd->add_data;
575 dma_addr_t dma;
576
577 dma = dma_map_single(target->srp_host->dev->dma_device,
578 scmnd->request_buffer, scmnd->request_bufflen,
579 scmnd->sc_data_direction);
580 if (dma_mapping_error(dma)) {
581 printk(KERN_WARNING PFX "unable to map %p/%d (dir %d)\n",
582 scmnd->request_buffer, (int) scmnd->request_bufflen,
583 scmnd->sc_data_direction);
584 return -EINVAL;
585 }
586
587 pci_unmap_addr_set(req, direct_mapping, dma);
588
589 buf->va = cpu_to_be64(dma);
590 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
591 buf->len = cpu_to_be32(scmnd->request_bufflen);
592
593 fmt = SRP_DATA_DESC_DIRECT;
594
595 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
596 }
597
598 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
599 cmd->buf_fmt = fmt << 4;
600 else
601 cmd->buf_fmt = fmt;
602
603
604 return len;
605 }
606
607 static void srp_unmap_data(struct scsi_cmnd *scmnd,
608 struct srp_target_port *target,
609 struct srp_request *req)
610 {
611 if (!scmnd->request_buffer ||
612 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
613 scmnd->sc_data_direction != DMA_FROM_DEVICE))
614 return;
615
616 if (scmnd->use_sg)
617 dma_unmap_sg(target->srp_host->dev->dma_device,
618 (struct scatterlist *) scmnd->request_buffer,
619 scmnd->use_sg, scmnd->sc_data_direction);
620 else
621 dma_unmap_single(target->srp_host->dev->dma_device,
622 pci_unmap_addr(req, direct_mapping),
623 scmnd->request_bufflen,
624 scmnd->sc_data_direction);
625 }
626
627 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
628 {
629 struct srp_request *req;
630 struct scsi_cmnd *scmnd;
631 unsigned long flags;
632 s32 delta;
633
634 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
635
636 spin_lock_irqsave(target->scsi_host->host_lock, flags);
637
638 target->req_lim += delta;
639
640 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
641
642 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
643 if (be32_to_cpu(rsp->resp_data_len) < 4)
644 req->tsk_status = -1;
645 else
646 req->tsk_status = rsp->data[3];
647 complete(&req->done);
648 } else {
649 scmnd = req->scmnd;
650 if (!scmnd)
651 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
652 (unsigned long long) rsp->tag);
653 scmnd->result = rsp->status;
654
655 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
656 memcpy(scmnd->sense_buffer, rsp->data +
657 be32_to_cpu(rsp->resp_data_len),
658 min_t(int, be32_to_cpu(rsp->sense_data_len),
659 SCSI_SENSE_BUFFERSIZE));
660 }
661
662 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
663 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
664 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
665 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
666
667 srp_unmap_data(scmnd, target, req);
668
669 if (!req->tsk_mgmt) {
670 req->scmnd = NULL;
671 scmnd->host_scribble = (void *) -1L;
672 scmnd->scsi_done(scmnd);
673
674 list_del(&req->list);
675 req->next = target->req_head;
676 target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
677 } else
678 req->cmd_done = 1;
679 }
680
681 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
682 }
683
684 static void srp_reconnect_work(void *target_ptr)
685 {
686 struct srp_target_port *target = target_ptr;
687
688 srp_reconnect_target(target);
689 }
690
691 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
692 {
693 struct srp_iu *iu;
694 u8 opcode;
695
696 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
697
698 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
699 target->max_ti_iu_len, DMA_FROM_DEVICE);
700
701 opcode = *(u8 *) iu->buf;
702
703 if (0) {
704 int i;
705
706 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
707
708 for (i = 0; i < wc->byte_len; ++i) {
709 if (i % 8 == 0)
710 printk(KERN_ERR " [%02x] ", i);
711 printk(" %02x", ((u8 *) iu->buf)[i]);
712 if ((i + 1) % 8 == 0)
713 printk("\n");
714 }
715
716 if (wc->byte_len % 8)
717 printk("\n");
718 }
719
720 switch (opcode) {
721 case SRP_RSP:
722 srp_process_rsp(target, iu->buf);
723 break;
724
725 case SRP_T_LOGOUT:
726 /* XXX Handle target logout */
727 printk(KERN_WARNING PFX "Got target logout request\n");
728 break;
729
730 default:
731 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
732 break;
733 }
734
735 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
736 target->max_ti_iu_len, DMA_FROM_DEVICE);
737 }
738
739 static void srp_completion(struct ib_cq *cq, void *target_ptr)
740 {
741 struct srp_target_port *target = target_ptr;
742 struct ib_wc wc;
743 unsigned long flags;
744
745 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
746 while (ib_poll_cq(cq, 1, &wc) > 0) {
747 if (wc.status) {
748 printk(KERN_ERR PFX "failed %s status %d\n",
749 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
750 wc.status);
751 spin_lock_irqsave(target->scsi_host->host_lock, flags);
752 if (target->state == SRP_TARGET_LIVE)
753 schedule_work(&target->work);
754 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
755 break;
756 }
757
758 if (wc.wr_id & SRP_OP_RECV)
759 srp_handle_recv(target, &wc);
760 else
761 ++target->tx_tail;
762 }
763 }
764
765 static int __srp_post_recv(struct srp_target_port *target)
766 {
767 struct srp_iu *iu;
768 struct ib_sge list;
769 struct ib_recv_wr wr, *bad_wr;
770 unsigned int next;
771 int ret;
772
773 next = target->rx_head & (SRP_RQ_SIZE - 1);
774 wr.wr_id = next | SRP_OP_RECV;
775 iu = target->rx_ring[next];
776
777 list.addr = iu->dma;
778 list.length = iu->size;
779 list.lkey = target->srp_host->mr->lkey;
780
781 wr.next = NULL;
782 wr.sg_list = &list;
783 wr.num_sge = 1;
784
785 ret = ib_post_recv(target->qp, &wr, &bad_wr);
786 if (!ret)
787 ++target->rx_head;
788
789 return ret;
790 }
791
792 static int srp_post_recv(struct srp_target_port *target)
793 {
794 unsigned long flags;
795 int ret;
796
797 spin_lock_irqsave(target->scsi_host->host_lock, flags);
798 ret = __srp_post_recv(target);
799 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
800
801 return ret;
802 }
803
804 /*
805 * Must be called with target->scsi_host->host_lock held to protect
806 * req_lim and tx_head. Lock cannot be dropped between call here and
807 * call to __srp_post_send().
808 */
809 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
810 {
811 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
812 return NULL;
813
814 if (unlikely(target->req_lim < 1)) {
815 if (printk_ratelimit())
816 printk(KERN_DEBUG PFX "Target has req_lim %d\n",
817 target->req_lim);
818 return NULL;
819 }
820
821 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
822 }
823
824 /*
825 * Must be called with target->scsi_host->host_lock held to protect
826 * req_lim and tx_head.
827 */
828 static int __srp_post_send(struct srp_target_port *target,
829 struct srp_iu *iu, int len)
830 {
831 struct ib_sge list;
832 struct ib_send_wr wr, *bad_wr;
833 int ret = 0;
834
835 list.addr = iu->dma;
836 list.length = len;
837 list.lkey = target->srp_host->mr->lkey;
838
839 wr.next = NULL;
840 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
841 wr.sg_list = &list;
842 wr.num_sge = 1;
843 wr.opcode = IB_WR_SEND;
844 wr.send_flags = IB_SEND_SIGNALED;
845
846 ret = ib_post_send(target->qp, &wr, &bad_wr);
847
848 if (!ret) {
849 ++target->tx_head;
850 --target->req_lim;
851 }
852
853 return ret;
854 }
855
856 static int srp_queuecommand(struct scsi_cmnd *scmnd,
857 void (*done)(struct scsi_cmnd *))
858 {
859 struct srp_target_port *target = host_to_target(scmnd->device->host);
860 struct srp_request *req;
861 struct srp_iu *iu;
862 struct srp_cmd *cmd;
863 long req_index;
864 int len;
865
866 if (target->state == SRP_TARGET_CONNECTING)
867 goto err;
868
869 if (target->state == SRP_TARGET_DEAD ||
870 target->state == SRP_TARGET_REMOVED) {
871 scmnd->result = DID_BAD_TARGET << 16;
872 done(scmnd);
873 return 0;
874 }
875
876 iu = __srp_get_tx_iu(target);
877 if (!iu)
878 goto err;
879
880 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
881 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
882
883 req_index = target->req_head;
884
885 scmnd->scsi_done = done;
886 scmnd->result = 0;
887 scmnd->host_scribble = (void *) req_index;
888
889 cmd = iu->buf;
890 memset(cmd, 0, sizeof *cmd);
891
892 cmd->opcode = SRP_CMD;
893 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
894 cmd->tag = req_index;
895 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
896
897 req = &target->req_ring[req_index];
898
899 req->scmnd = scmnd;
900 req->cmd = iu;
901 req->cmd_done = 0;
902 req->tsk_mgmt = NULL;
903
904 len = srp_map_data(scmnd, target, req);
905 if (len < 0) {
906 printk(KERN_ERR PFX "Failed to map data\n");
907 goto err;
908 }
909
910 if (__srp_post_recv(target)) {
911 printk(KERN_ERR PFX "Recv failed\n");
912 goto err_unmap;
913 }
914
915 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
916 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
917
918 if (__srp_post_send(target, iu, len)) {
919 printk(KERN_ERR PFX "Send failed\n");
920 goto err_unmap;
921 }
922
923 target->req_head = req->next;
924 list_add_tail(&req->list, &target->req_queue);
925
926 return 0;
927
928 err_unmap:
929 srp_unmap_data(scmnd, target, req);
930
931 err:
932 return SCSI_MLQUEUE_HOST_BUSY;
933 }
934
935 static int srp_alloc_iu_bufs(struct srp_target_port *target)
936 {
937 int i;
938
939 for (i = 0; i < SRP_RQ_SIZE; ++i) {
940 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
941 target->max_ti_iu_len,
942 GFP_KERNEL, DMA_FROM_DEVICE);
943 if (!target->rx_ring[i])
944 goto err;
945 }
946
947 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
948 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
949 SRP_MAX_IU_LEN,
950 GFP_KERNEL, DMA_TO_DEVICE);
951 if (!target->tx_ring[i])
952 goto err;
953 }
954
955 return 0;
956
957 err:
958 for (i = 0; i < SRP_RQ_SIZE; ++i) {
959 srp_free_iu(target->srp_host, target->rx_ring[i]);
960 target->rx_ring[i] = NULL;
961 }
962
963 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
964 srp_free_iu(target->srp_host, target->tx_ring[i]);
965 target->tx_ring[i] = NULL;
966 }
967
968 return -ENOMEM;
969 }
970
971 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
972 struct ib_cm_event *event,
973 struct srp_target_port *target)
974 {
975 struct ib_class_port_info *cpi;
976 int opcode;
977
978 switch (event->param.rej_rcvd.reason) {
979 case IB_CM_REJ_PORT_CM_REDIRECT:
980 cpi = event->param.rej_rcvd.ari;
981 target->path.dlid = cpi->redirect_lid;
982 target->path.pkey = cpi->redirect_pkey;
983 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
984 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
985
986 target->status = target->path.dlid ?
987 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
988 break;
989
990 case IB_CM_REJ_PORT_REDIRECT:
991 if (topspin_workarounds &&
992 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
993 /*
994 * Topspin/Cisco SRP gateways incorrectly send
995 * reject reason code 25 when they mean 24
996 * (port redirect).
997 */
998 memcpy(target->path.dgid.raw,
999 event->param.rej_rcvd.ari, 16);
1000
1001 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1002 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1003 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1004
1005 target->status = SRP_PORT_REDIRECT;
1006 } else {
1007 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1008 target->status = -ECONNRESET;
1009 }
1010 break;
1011
1012 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1013 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1014 target->status = -ECONNRESET;
1015 break;
1016
1017 case IB_CM_REJ_CONSUMER_DEFINED:
1018 opcode = *(u8 *) event->private_data;
1019 if (opcode == SRP_LOGIN_REJ) {
1020 struct srp_login_rej *rej = event->private_data;
1021 u32 reason = be32_to_cpu(rej->reason);
1022
1023 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1024 printk(KERN_WARNING PFX
1025 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1026 else
1027 printk(KERN_WARNING PFX
1028 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1029 } else
1030 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1031 " opcode 0x%02x\n", opcode);
1032 target->status = -ECONNRESET;
1033 break;
1034
1035 default:
1036 printk(KERN_WARNING " REJ reason 0x%x\n",
1037 event->param.rej_rcvd.reason);
1038 target->status = -ECONNRESET;
1039 }
1040 }
1041
1042 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1043 {
1044 struct srp_target_port *target = cm_id->context;
1045 struct ib_qp_attr *qp_attr = NULL;
1046 int attr_mask = 0;
1047 int comp = 0;
1048 int opcode = 0;
1049
1050 switch (event->event) {
1051 case IB_CM_REQ_ERROR:
1052 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1053 comp = 1;
1054 target->status = -ECONNRESET;
1055 break;
1056
1057 case IB_CM_REP_RECEIVED:
1058 comp = 1;
1059 opcode = *(u8 *) event->private_data;
1060
1061 if (opcode == SRP_LOGIN_RSP) {
1062 struct srp_login_rsp *rsp = event->private_data;
1063
1064 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1065 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1066
1067 target->scsi_host->can_queue = min(target->req_lim,
1068 target->scsi_host->can_queue);
1069 } else {
1070 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1071 target->status = -ECONNRESET;
1072 break;
1073 }
1074
1075 target->status = srp_alloc_iu_bufs(target);
1076 if (target->status)
1077 break;
1078
1079 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1080 if (!qp_attr) {
1081 target->status = -ENOMEM;
1082 break;
1083 }
1084
1085 qp_attr->qp_state = IB_QPS_RTR;
1086 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1087 if (target->status)
1088 break;
1089
1090 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1091 if (target->status)
1092 break;
1093
1094 target->status = srp_post_recv(target);
1095 if (target->status)
1096 break;
1097
1098 qp_attr->qp_state = IB_QPS_RTS;
1099 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1100 if (target->status)
1101 break;
1102
1103 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1104 if (target->status)
1105 break;
1106
1107 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1108 if (target->status)
1109 break;
1110
1111 break;
1112
1113 case IB_CM_REJ_RECEIVED:
1114 printk(KERN_DEBUG PFX "REJ received\n");
1115 comp = 1;
1116
1117 srp_cm_rej_handler(cm_id, event, target);
1118 break;
1119
1120 case IB_CM_MRA_RECEIVED:
1121 printk(KERN_ERR PFX "MRA received\n");
1122 break;
1123
1124 case IB_CM_DREP_RECEIVED:
1125 break;
1126
1127 case IB_CM_TIMEWAIT_EXIT:
1128 printk(KERN_ERR PFX "connection closed\n");
1129
1130 comp = 1;
1131 target->status = 0;
1132 break;
1133
1134 default:
1135 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1136 break;
1137 }
1138
1139 if (comp)
1140 complete(&target->done);
1141
1142 kfree(qp_attr);
1143
1144 return 0;
1145 }
1146
1147 static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
1148 {
1149 struct srp_target_port *target = host_to_target(scmnd->device->host);
1150 struct srp_request *req;
1151 struct srp_iu *iu;
1152 struct srp_tsk_mgmt *tsk_mgmt;
1153 int req_index;
1154 int ret = FAILED;
1155
1156 spin_lock_irq(target->scsi_host->host_lock);
1157
1158 if (target->state == SRP_TARGET_DEAD ||
1159 target->state == SRP_TARGET_REMOVED) {
1160 scmnd->result = DID_BAD_TARGET << 16;
1161 goto out;
1162 }
1163
1164 if (scmnd->host_scribble == (void *) -1L)
1165 goto out;
1166
1167 req_index = (long) scmnd->host_scribble;
1168 printk(KERN_ERR "Abort for req_index %d\n", req_index);
1169
1170 req = &target->req_ring[req_index];
1171 init_completion(&req->done);
1172
1173 iu = __srp_get_tx_iu(target);
1174 if (!iu)
1175 goto out;
1176
1177 tsk_mgmt = iu->buf;
1178 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1179
1180 tsk_mgmt->opcode = SRP_TSK_MGMT;
1181 tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1182 tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
1183 tsk_mgmt->tsk_mgmt_func = func;
1184 tsk_mgmt->task_tag = req_index;
1185
1186 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1187 goto out;
1188
1189 req->tsk_mgmt = iu;
1190
1191 spin_unlock_irq(target->scsi_host->host_lock);
1192 if (!wait_for_completion_timeout(&req->done,
1193 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1194 return FAILED;
1195 spin_lock_irq(target->scsi_host->host_lock);
1196
1197 if (req->cmd_done) {
1198 list_del(&req->list);
1199 req->next = target->req_head;
1200 target->req_head = req_index;
1201
1202 scmnd->scsi_done(scmnd);
1203 } else if (!req->tsk_status) {
1204 scmnd->result = DID_ABORT << 16;
1205 ret = SUCCESS;
1206 }
1207
1208 out:
1209 spin_unlock_irq(target->scsi_host->host_lock);
1210 return ret;
1211 }
1212
1213 static int srp_abort(struct scsi_cmnd *scmnd)
1214 {
1215 printk(KERN_ERR "SRP abort called\n");
1216
1217 return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
1218 }
1219
1220 static int srp_reset_device(struct scsi_cmnd *scmnd)
1221 {
1222 printk(KERN_ERR "SRP reset_device called\n");
1223
1224 return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
1225 }
1226
1227 static int srp_reset_host(struct scsi_cmnd *scmnd)
1228 {
1229 struct srp_target_port *target = host_to_target(scmnd->device->host);
1230 int ret = FAILED;
1231
1232 printk(KERN_ERR PFX "SRP reset_host called\n");
1233
1234 if (!srp_reconnect_target(target))
1235 ret = SUCCESS;
1236
1237 return ret;
1238 }
1239
1240 static struct scsi_host_template srp_template = {
1241 .module = THIS_MODULE,
1242 .name = DRV_NAME,
1243 .info = srp_target_info,
1244 .queuecommand = srp_queuecommand,
1245 .eh_abort_handler = srp_abort,
1246 .eh_device_reset_handler = srp_reset_device,
1247 .eh_host_reset_handler = srp_reset_host,
1248 .can_queue = SRP_SQ_SIZE,
1249 .this_id = -1,
1250 .sg_tablesize = SRP_MAX_INDIRECT,
1251 .cmd_per_lun = SRP_SQ_SIZE,
1252 .use_clustering = ENABLE_CLUSTERING
1253 };
1254
1255 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1256 {
1257 sprintf(target->target_name, "SRP.T10:%016llX",
1258 (unsigned long long) be64_to_cpu(target->id_ext));
1259
1260 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1261 return -ENODEV;
1262
1263 mutex_lock(&host->target_mutex);
1264 list_add_tail(&target->list, &host->target_list);
1265 mutex_unlock(&host->target_mutex);
1266
1267 target->state = SRP_TARGET_LIVE;
1268
1269 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1270 scsi_scan_target(&target->scsi_host->shost_gendev,
1271 0, target->scsi_id, ~0, 0);
1272
1273 return 0;
1274 }
1275
1276 static void srp_release_class_dev(struct class_device *class_dev)
1277 {
1278 struct srp_host *host =
1279 container_of(class_dev, struct srp_host, class_dev);
1280
1281 complete(&host->released);
1282 }
1283
1284 static struct class srp_class = {
1285 .name = "infiniband_srp",
1286 .release = srp_release_class_dev
1287 };
1288
1289 /*
1290 * Target ports are added by writing
1291 *
1292 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1293 * pkey=<P_Key>,service_id=<service ID>
1294 *
1295 * to the add_target sysfs attribute.
1296 */
1297 enum {
1298 SRP_OPT_ERR = 0,
1299 SRP_OPT_ID_EXT = 1 << 0,
1300 SRP_OPT_IOC_GUID = 1 << 1,
1301 SRP_OPT_DGID = 1 << 2,
1302 SRP_OPT_PKEY = 1 << 3,
1303 SRP_OPT_SERVICE_ID = 1 << 4,
1304 SRP_OPT_MAX_SECT = 1 << 5,
1305 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1306 SRP_OPT_IOC_GUID |
1307 SRP_OPT_DGID |
1308 SRP_OPT_PKEY |
1309 SRP_OPT_SERVICE_ID),
1310 };
1311
1312 static match_table_t srp_opt_tokens = {
1313 { SRP_OPT_ID_EXT, "id_ext=%s" },
1314 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1315 { SRP_OPT_DGID, "dgid=%s" },
1316 { SRP_OPT_PKEY, "pkey=%x" },
1317 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1318 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1319 { SRP_OPT_ERR, NULL }
1320 };
1321
1322 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1323 {
1324 char *options, *sep_opt;
1325 char *p;
1326 char dgid[3];
1327 substring_t args[MAX_OPT_ARGS];
1328 int opt_mask = 0;
1329 int token;
1330 int ret = -EINVAL;
1331 int i;
1332
1333 options = kstrdup(buf, GFP_KERNEL);
1334 if (!options)
1335 return -ENOMEM;
1336
1337 sep_opt = options;
1338 while ((p = strsep(&sep_opt, ",")) != NULL) {
1339 if (!*p)
1340 continue;
1341
1342 token = match_token(p, srp_opt_tokens, args);
1343 opt_mask |= token;
1344
1345 switch (token) {
1346 case SRP_OPT_ID_EXT:
1347 p = match_strdup(args);
1348 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1349 kfree(p);
1350 break;
1351
1352 case SRP_OPT_IOC_GUID:
1353 p = match_strdup(args);
1354 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1355 kfree(p);
1356 break;
1357
1358 case SRP_OPT_DGID:
1359 p = match_strdup(args);
1360 if (strlen(p) != 32) {
1361 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1362 goto out;
1363 }
1364
1365 for (i = 0; i < 16; ++i) {
1366 strlcpy(dgid, p + i * 2, 3);
1367 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1368 }
1369 break;
1370
1371 case SRP_OPT_PKEY:
1372 if (match_hex(args, &token)) {
1373 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1374 goto out;
1375 }
1376 target->path.pkey = cpu_to_be16(token);
1377 break;
1378
1379 case SRP_OPT_SERVICE_ID:
1380 p = match_strdup(args);
1381 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1382 kfree(p);
1383 break;
1384
1385 case SRP_OPT_MAX_SECT:
1386 if (match_int(args, &token)) {
1387 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1388 goto out;
1389 }
1390 target->scsi_host->max_sectors = token;
1391 break;
1392
1393 default:
1394 printk(KERN_WARNING PFX "unknown parameter or missing value "
1395 "'%s' in target creation request\n", p);
1396 goto out;
1397 }
1398 }
1399
1400 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1401 ret = 0;
1402 else
1403 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1404 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1405 !(srp_opt_tokens[i].token & opt_mask))
1406 printk(KERN_WARNING PFX "target creation request is "
1407 "missing parameter '%s'\n",
1408 srp_opt_tokens[i].pattern);
1409
1410 out:
1411 kfree(options);
1412 return ret;
1413 }
1414
1415 static ssize_t srp_create_target(struct class_device *class_dev,
1416 const char *buf, size_t count)
1417 {
1418 struct srp_host *host =
1419 container_of(class_dev, struct srp_host, class_dev);
1420 struct Scsi_Host *target_host;
1421 struct srp_target_port *target;
1422 int ret;
1423 int i;
1424
1425 target_host = scsi_host_alloc(&srp_template,
1426 sizeof (struct srp_target_port));
1427 if (!target_host)
1428 return -ENOMEM;
1429
1430 target_host->max_lun = SRP_MAX_LUN;
1431
1432 target = host_to_target(target_host);
1433 memset(target, 0, sizeof *target);
1434
1435 target->scsi_host = target_host;
1436 target->srp_host = host;
1437
1438 INIT_WORK(&target->work, srp_reconnect_work, target);
1439
1440 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
1441 target->req_ring[i].next = i + 1;
1442 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
1443 INIT_LIST_HEAD(&target->req_queue);
1444
1445 ret = srp_parse_options(buf, target);
1446 if (ret)
1447 goto err;
1448
1449 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1450
1451 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1452 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1453 (unsigned long long) be64_to_cpu(target->id_ext),
1454 (unsigned long long) be64_to_cpu(target->ioc_guid),
1455 be16_to_cpu(target->path.pkey),
1456 (unsigned long long) be64_to_cpu(target->service_id),
1457 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1458 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1459 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1460 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1461 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1462 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1463 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1464 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1465
1466 ret = srp_create_target_ib(target);
1467 if (ret)
1468 goto err;
1469
1470 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1471 if (IS_ERR(target->cm_id)) {
1472 ret = PTR_ERR(target->cm_id);
1473 goto err_free;
1474 }
1475
1476 ret = srp_connect_target(target);
1477 if (ret) {
1478 printk(KERN_ERR PFX "Connection failed\n");
1479 goto err_cm_id;
1480 }
1481
1482 ret = srp_add_target(host, target);
1483 if (ret)
1484 goto err_disconnect;
1485
1486 return count;
1487
1488 err_disconnect:
1489 srp_disconnect_target(target);
1490
1491 err_cm_id:
1492 ib_destroy_cm_id(target->cm_id);
1493
1494 err_free:
1495 srp_free_target_ib(target);
1496
1497 err:
1498 scsi_host_put(target_host);
1499
1500 return ret;
1501 }
1502
1503 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1504
1505 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1506 {
1507 struct srp_host *host =
1508 container_of(class_dev, struct srp_host, class_dev);
1509
1510 return sprintf(buf, "%s\n", host->dev->name);
1511 }
1512
1513 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1514
1515 static ssize_t show_port(struct class_device *class_dev, char *buf)
1516 {
1517 struct srp_host *host =
1518 container_of(class_dev, struct srp_host, class_dev);
1519
1520 return sprintf(buf, "%d\n", host->port);
1521 }
1522
1523 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1524
1525 static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
1526 {
1527 struct srp_host *host;
1528
1529 host = kzalloc(sizeof *host, GFP_KERNEL);
1530 if (!host)
1531 return NULL;
1532
1533 INIT_LIST_HEAD(&host->target_list);
1534 mutex_init(&host->target_mutex);
1535 init_completion(&host->released);
1536 host->dev = device;
1537 host->port = port;
1538
1539 host->initiator_port_id[7] = port;
1540 memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
1541
1542 host->pd = ib_alloc_pd(device);
1543 if (IS_ERR(host->pd))
1544 goto err_free;
1545
1546 host->mr = ib_get_dma_mr(host->pd,
1547 IB_ACCESS_LOCAL_WRITE |
1548 IB_ACCESS_REMOTE_READ |
1549 IB_ACCESS_REMOTE_WRITE);
1550 if (IS_ERR(host->mr))
1551 goto err_pd;
1552
1553 host->class_dev.class = &srp_class;
1554 host->class_dev.dev = device->dma_device;
1555 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1556 device->name, port);
1557
1558 if (class_device_register(&host->class_dev))
1559 goto err_mr;
1560 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1561 goto err_class;
1562 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1563 goto err_class;
1564 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1565 goto err_class;
1566
1567 return host;
1568
1569 err_class:
1570 class_device_unregister(&host->class_dev);
1571
1572 err_mr:
1573 ib_dereg_mr(host->mr);
1574
1575 err_pd:
1576 ib_dealloc_pd(host->pd);
1577
1578 err_free:
1579 kfree(host);
1580
1581 return NULL;
1582 }
1583
1584 static void srp_add_one(struct ib_device *device)
1585 {
1586 struct list_head *dev_list;
1587 struct srp_host *host;
1588 int s, e, p;
1589
1590 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1591 if (!dev_list)
1592 return;
1593
1594 INIT_LIST_HEAD(dev_list);
1595
1596 if (device->node_type == IB_NODE_SWITCH) {
1597 s = 0;
1598 e = 0;
1599 } else {
1600 s = 1;
1601 e = device->phys_port_cnt;
1602 }
1603
1604 for (p = s; p <= e; ++p) {
1605 host = srp_add_port(device, p);
1606 if (host)
1607 list_add_tail(&host->list, dev_list);
1608 }
1609
1610 ib_set_client_data(device, &srp_client, dev_list);
1611 }
1612
1613 static void srp_remove_one(struct ib_device *device)
1614 {
1615 struct list_head *dev_list;
1616 struct srp_host *host, *tmp_host;
1617 LIST_HEAD(target_list);
1618 struct srp_target_port *target, *tmp_target;
1619 unsigned long flags;
1620
1621 dev_list = ib_get_client_data(device, &srp_client);
1622
1623 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1624 class_device_unregister(&host->class_dev);
1625 /*
1626 * Wait for the sysfs entry to go away, so that no new
1627 * target ports can be created.
1628 */
1629 wait_for_completion(&host->released);
1630
1631 /*
1632 * Mark all target ports as removed, so we stop queueing
1633 * commands and don't try to reconnect.
1634 */
1635 mutex_lock(&host->target_mutex);
1636 list_for_each_entry_safe(target, tmp_target,
1637 &host->target_list, list) {
1638 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1639 if (target->state != SRP_TARGET_REMOVED)
1640 target->state = SRP_TARGET_REMOVED;
1641 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1642 }
1643 mutex_unlock(&host->target_mutex);
1644
1645 /*
1646 * Wait for any reconnection tasks that may have
1647 * started before we marked our target ports as
1648 * removed, and any target port removal tasks.
1649 */
1650 flush_scheduled_work();
1651
1652 list_for_each_entry_safe(target, tmp_target,
1653 &host->target_list, list) {
1654 scsi_remove_host(target->scsi_host);
1655 srp_disconnect_target(target);
1656 ib_destroy_cm_id(target->cm_id);
1657 srp_free_target_ib(target);
1658 scsi_host_put(target->scsi_host);
1659 }
1660
1661 ib_dereg_mr(host->mr);
1662 ib_dealloc_pd(host->pd);
1663 kfree(host);
1664 }
1665
1666 kfree(dev_list);
1667 }
1668
1669 static int __init srp_init_module(void)
1670 {
1671 int ret;
1672
1673 ret = class_register(&srp_class);
1674 if (ret) {
1675 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1676 return ret;
1677 }
1678
1679 ret = ib_register_client(&srp_client);
1680 if (ret) {
1681 printk(KERN_ERR PFX "couldn't register IB client\n");
1682 class_unregister(&srp_class);
1683 return ret;
1684 }
1685
1686 return 0;
1687 }
1688
1689 static void __exit srp_cleanup_module(void)
1690 {
1691 ib_unregister_client(&srp_client);
1692 class_unregister(&srp_class);
1693 }
1694
1695 module_init(srp_init_module);
1696 module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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