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IB/srp: Clean up loop in srp_remove_one()
[linux-2.6/x86.git] / drivers / infiniband / ulp / srp / ib_srp.c
blob46292561c44c57716a270a4bbfe455303a0b8471
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->dev->dma_device,
109 iu->buf, size, direction);
110 if (dma_mapping_error(iu->dma))
111 goto out_free_buf;
112
113 iu->size = size;
114 iu->direction = direction;
115
116 return iu;
117
118 out_free_buf:
119 kfree(iu->buf);
120 out_free_iu:
121 kfree(iu);
122 out:
123 return NULL;
124 }
125
126 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
127 {
128 if (!iu)
129 return;
130
131 dma_unmap_single(host->dev->dev->dma_device,
132 iu->dma, iu->size, iu->direction);
133 kfree(iu->buf);
134 kfree(iu);
135 }
136
137 static void srp_qp_event(struct ib_event *event, void *context)
138 {
139 printk(KERN_ERR PFX "QP event %d\n", event->event);
140 }
141
142 static int srp_init_qp(struct srp_target_port *target,
143 struct ib_qp *qp)
144 {
145 struct ib_qp_attr *attr;
146 int ret;
147
148 attr = kmalloc(sizeof *attr, GFP_KERNEL);
149 if (!attr)
150 return -ENOMEM;
151
152 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
153 target->srp_host->port,
154 be16_to_cpu(target->path.pkey),
155 &attr->pkey_index);
156 if (ret)
157 goto out;
158
159 attr->qp_state = IB_QPS_INIT;
160 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
161 IB_ACCESS_REMOTE_WRITE);
162 attr->port_num = target->srp_host->port;
163
164 ret = ib_modify_qp(qp, attr,
165 IB_QP_STATE |
166 IB_QP_PKEY_INDEX |
167 IB_QP_ACCESS_FLAGS |
168 IB_QP_PORT);
169
170 out:
171 kfree(attr);
172 return ret;
173 }
174
175 static int srp_create_target_ib(struct srp_target_port *target)
176 {
177 struct ib_qp_init_attr *init_attr;
178 int ret;
179
180 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
181 if (!init_attr)
182 return -ENOMEM;
183
184 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
185 NULL, target, SRP_CQ_SIZE);
186 if (IS_ERR(target->cq)) {
187 ret = PTR_ERR(target->cq);
188 goto out;
189 }
190
191 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
192
193 init_attr->event_handler = srp_qp_event;
194 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
195 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
196 init_attr->cap.max_recv_sge = 1;
197 init_attr->cap.max_send_sge = 1;
198 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
199 init_attr->qp_type = IB_QPT_RC;
200 init_attr->send_cq = target->cq;
201 init_attr->recv_cq = target->cq;
202
203 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
204 if (IS_ERR(target->qp)) {
205 ret = PTR_ERR(target->qp);
206 ib_destroy_cq(target->cq);
207 goto out;
208 }
209
210 ret = srp_init_qp(target, target->qp);
211 if (ret) {
212 ib_destroy_qp(target->qp);
213 ib_destroy_cq(target->cq);
214 goto out;
215 }
216
217 out:
218 kfree(init_attr);
219 return ret;
220 }
221
222 static void srp_free_target_ib(struct srp_target_port *target)
223 {
224 int i;
225
226 ib_destroy_qp(target->qp);
227 ib_destroy_cq(target->cq);
228
229 for (i = 0; i < SRP_RQ_SIZE; ++i)
230 srp_free_iu(target->srp_host, target->rx_ring[i]);
231 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
232 srp_free_iu(target->srp_host, target->tx_ring[i]);
233 }
234
235 static void srp_path_rec_completion(int status,
236 struct ib_sa_path_rec *pathrec,
237 void *target_ptr)
238 {
239 struct srp_target_port *target = target_ptr;
240
241 target->status = status;
242 if (status)
243 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
244 else
245 target->path = *pathrec;
246 complete(&target->done);
247 }
248
249 static int srp_lookup_path(struct srp_target_port *target)
250 {
251 target->path.numb_path = 1;
252
253 init_completion(&target->done);
254
255 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev->dev,
256 target->srp_host->port,
257 &target->path,
258 IB_SA_PATH_REC_DGID |
259 IB_SA_PATH_REC_SGID |
260 IB_SA_PATH_REC_NUMB_PATH |
261 IB_SA_PATH_REC_PKEY,
262 SRP_PATH_REC_TIMEOUT_MS,
263 GFP_KERNEL,
264 srp_path_rec_completion,
265 target, &target->path_query);
266 if (target->path_query_id < 0)
267 return target->path_query_id;
268
269 wait_for_completion(&target->done);
270
271 if (target->status < 0)
272 printk(KERN_WARNING PFX "Path record query failed\n");
273
274 return target->status;
275 }
276
277 static int srp_send_req(struct srp_target_port *target)
278 {
279 struct {
280 struct ib_cm_req_param param;
281 struct srp_login_req priv;
282 } *req = NULL;
283 int status;
284
285 req = kzalloc(sizeof *req, GFP_KERNEL);
286 if (!req)
287 return -ENOMEM;
288
289 req->param.primary_path = &target->path;
290 req->param.alternate_path = NULL;
291 req->param.service_id = target->service_id;
292 req->param.qp_num = target->qp->qp_num;
293 req->param.qp_type = target->qp->qp_type;
294 req->param.private_data = &req->priv;
295 req->param.private_data_len = sizeof req->priv;
296 req->param.flow_control = 1;
297
298 get_random_bytes(&req->param.starting_psn, 4);
299 req->param.starting_psn &= 0xffffff;
300
301 /*
302 * Pick some arbitrary defaults here; we could make these
303 * module parameters if anyone cared about setting them.
304 */
305 req->param.responder_resources = 4;
306 req->param.remote_cm_response_timeout = 20;
307 req->param.local_cm_response_timeout = 20;
308 req->param.retry_count = 7;
309 req->param.rnr_retry_count = 7;
310 req->param.max_cm_retries = 15;
311
312 req->priv.opcode = SRP_LOGIN_REQ;
313 req->priv.tag = 0;
314 req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
315 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
316 SRP_BUF_FORMAT_INDIRECT);
317 memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
318 /*
319 * Topspin/Cisco SRP targets will reject our login unless we
320 * zero out the first 8 bytes of our initiator port ID. The
321 * second 8 bytes must be our local node GUID, but we always
322 * use that anyway.
323 */
324 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
325 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
326 "activated for target GUID %016llx\n",
327 (unsigned long long) be64_to_cpu(target->ioc_guid));
328 memset(req->priv.initiator_port_id, 0, 8);
329 }
330 memcpy(req->priv.target_port_id, &target->id_ext, 8);
331 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
332
333 status = ib_send_cm_req(target->cm_id, &req->param);
334
335 kfree(req);
336
337 return status;
338 }
339
340 static void srp_disconnect_target(struct srp_target_port *target)
341 {
342 /* XXX should send SRP_I_LOGOUT request */
343
344 init_completion(&target->done);
345 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
346 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
347 return;
348 }
349 wait_for_completion(&target->done);
350 }
351
352 static void srp_remove_work(void *target_ptr)
353 {
354 struct srp_target_port *target = target_ptr;
355
356 spin_lock_irq(target->scsi_host->host_lock);
357 if (target->state != SRP_TARGET_DEAD) {
358 spin_unlock_irq(target->scsi_host->host_lock);
359 return;
360 }
361 target->state = SRP_TARGET_REMOVED;
362 spin_unlock_irq(target->scsi_host->host_lock);
363
364 spin_lock(&target->srp_host->target_lock);
365 list_del(&target->list);
366 spin_unlock(&target->srp_host->target_lock);
367
368 scsi_remove_host(target->scsi_host);
369 ib_destroy_cm_id(target->cm_id);
370 srp_free_target_ib(target);
371 scsi_host_put(target->scsi_host);
372 }
373
374 static int srp_connect_target(struct srp_target_port *target)
375 {
376 int ret;
377
378 ret = srp_lookup_path(target);
379 if (ret)
380 return ret;
381
382 while (1) {
383 init_completion(&target->done);
384 ret = srp_send_req(target);
385 if (ret)
386 return ret;
387 wait_for_completion(&target->done);
388
389 /*
390 * The CM event handling code will set status to
391 * SRP_PORT_REDIRECT if we get a port redirect REJ
392 * back, or SRP_DLID_REDIRECT if we get a lid/qp
393 * redirect REJ back.
394 */
395 switch (target->status) {
396 case 0:
397 return 0;
398
399 case SRP_PORT_REDIRECT:
400 ret = srp_lookup_path(target);
401 if (ret)
402 return ret;
403 break;
404
405 case SRP_DLID_REDIRECT:
406 break;
407
408 default:
409 return target->status;
410 }
411 }
412 }
413
414 static void srp_unmap_data(struct scsi_cmnd *scmnd,
415 struct srp_target_port *target,
416 struct srp_request *req)
417 {
418 struct scatterlist *scat;
419 int nents;
420
421 if (!scmnd->request_buffer ||
422 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
423 scmnd->sc_data_direction != DMA_FROM_DEVICE))
424 return;
425
426 if (req->fmr) {
427 ib_fmr_pool_unmap(req->fmr);
428 req->fmr = NULL;
429 }
430
431 /*
432 * This handling of non-SG commands can be killed when the
433 * SCSI midlayer no longer generates non-SG commands.
434 */
435 if (likely(scmnd->use_sg)) {
436 nents = scmnd->use_sg;
437 scat = scmnd->request_buffer;
438 } else {
439 nents = 1;
440 scat = &req->fake_sg;
441 }
442
443 dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
444 scmnd->sc_data_direction);
445 }
446
447 static int srp_reconnect_target(struct srp_target_port *target)
448 {
449 struct ib_cm_id *new_cm_id;
450 struct ib_qp_attr qp_attr;
451 struct srp_request *req;
452 struct ib_wc wc;
453 int ret;
454 int i;
455
456 spin_lock_irq(target->scsi_host->host_lock);
457 if (target->state != SRP_TARGET_LIVE) {
458 spin_unlock_irq(target->scsi_host->host_lock);
459 return -EAGAIN;
460 }
461 target->state = SRP_TARGET_CONNECTING;
462 spin_unlock_irq(target->scsi_host->host_lock);
463
464 srp_disconnect_target(target);
465 /*
466 * Now get a new local CM ID so that we avoid confusing the
467 * target in case things are really fouled up.
468 */
469 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
470 srp_cm_handler, target);
471 if (IS_ERR(new_cm_id)) {
472 ret = PTR_ERR(new_cm_id);
473 goto err;
474 }
475 ib_destroy_cm_id(target->cm_id);
476 target->cm_id = new_cm_id;
477
478 qp_attr.qp_state = IB_QPS_RESET;
479 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
480 if (ret)
481 goto err;
482
483 ret = srp_init_qp(target, target->qp);
484 if (ret)
485 goto err;
486
487 while (ib_poll_cq(target->cq, 1, &wc) > 0)
488 ; /* nothing */
489
490 list_for_each_entry(req, &target->req_queue, list) {
491 req->scmnd->result = DID_RESET << 16;
492 req->scmnd->scsi_done(req->scmnd);
493 srp_unmap_data(req->scmnd, target, req);
494 }
495
496 target->rx_head = 0;
497 target->tx_head = 0;
498 target->tx_tail = 0;
499 INIT_LIST_HEAD(&target->free_reqs);
500 INIT_LIST_HEAD(&target->req_queue);
501 for (i = 0; i < SRP_SQ_SIZE; ++i)
502 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
503
504 ret = srp_connect_target(target);
505 if (ret)
506 goto err;
507
508 spin_lock_irq(target->scsi_host->host_lock);
509 if (target->state == SRP_TARGET_CONNECTING) {
510 ret = 0;
511 target->state = SRP_TARGET_LIVE;
512 } else
513 ret = -EAGAIN;
514 spin_unlock_irq(target->scsi_host->host_lock);
515
516 return ret;
517
518 err:
519 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
520
521 /*
522 * We couldn't reconnect, so kill our target port off.
523 * However, we have to defer the real removal because we might
524 * be in the context of the SCSI error handler now, which
525 * would deadlock if we call scsi_remove_host().
526 */
527 spin_lock_irq(target->scsi_host->host_lock);
528 if (target->state == SRP_TARGET_CONNECTING) {
529 target->state = SRP_TARGET_DEAD;
530 INIT_WORK(&target->work, srp_remove_work, target);
531 schedule_work(&target->work);
532 }
533 spin_unlock_irq(target->scsi_host->host_lock);
534
535 return ret;
536 }
537
538 static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat,
539 int sg_cnt, struct srp_request *req,
540 struct srp_direct_buf *buf)
541 {
542 u64 io_addr = 0;
543 u64 *dma_pages;
544 u32 len;
545 int page_cnt;
546 int i, j;
547 int ret;
548
549 if (!dev->fmr_pool)
550 return -ENODEV;
551
552 len = page_cnt = 0;
553 for (i = 0; i < sg_cnt; ++i) {
554 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
555 if (i > 0)
556 return -EINVAL;
557 else
558 ++page_cnt;
559 }
560 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
561 ~dev->fmr_page_mask) {
562 if (i < sg_cnt - 1)
563 return -EINVAL;
564 else
565 ++page_cnt;
566 }
567
568 len += sg_dma_len(&scat[i]);
569 }
570
571 page_cnt += len >> dev->fmr_page_shift;
572 if (page_cnt > SRP_FMR_SIZE)
573 return -ENOMEM;
574
575 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
576 if (!dma_pages)
577 return -ENOMEM;
578
579 page_cnt = 0;
580 for (i = 0; i < sg_cnt; ++i)
581 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
582 dma_pages[page_cnt++] =
583 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
584
585 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
586 dma_pages, page_cnt, &io_addr);
587 if (IS_ERR(req->fmr)) {
588 ret = PTR_ERR(req->fmr);
589 goto out;
590 }
591
592 buf->va = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
593 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
594 buf->len = cpu_to_be32(len);
595
596 ret = 0;
597
598 out:
599 kfree(dma_pages);
600
601 return ret;
602 }
603
604 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
605 struct srp_request *req)
606 {
607 struct scatterlist *scat;
608 struct srp_cmd *cmd = req->cmd->buf;
609 int len, nents, count;
610 u8 fmt = SRP_DATA_DESC_DIRECT;
611
612 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
613 return sizeof (struct srp_cmd);
614
615 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
616 scmnd->sc_data_direction != DMA_TO_DEVICE) {
617 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
618 scmnd->sc_data_direction);
619 return -EINVAL;
620 }
621
622 /*
623 * This handling of non-SG commands can be killed when the
624 * SCSI midlayer no longer generates non-SG commands.
625 */
626 if (likely(scmnd->use_sg)) {
627 nents = scmnd->use_sg;
628 scat = scmnd->request_buffer;
629 } else {
630 nents = 1;
631 scat = &req->fake_sg;
632 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
633 }
634
635 count = dma_map_sg(target->srp_host->dev->dev->dma_device,
636 scat, nents, scmnd->sc_data_direction);
637
638 fmt = SRP_DATA_DESC_DIRECT;
639 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
640
641 if (count == 1) {
642 /*
643 * The midlayer only generated a single gather/scatter
644 * entry, or DMA mapping coalesced everything to a
645 * single entry. So a direct descriptor along with
646 * the DMA MR suffices.
647 */
648 struct srp_direct_buf *buf = (void *) cmd->add_data;
649
650 buf->va = cpu_to_be64(sg_dma_address(scat));
651 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
652 buf->len = cpu_to_be32(sg_dma_len(scat));
653 } else if (srp_map_fmr(target->srp_host->dev, scat, count, req,
654 (void *) cmd->add_data)) {
655 /*
656 * FMR mapping failed, and the scatterlist has more
657 * than one entry. Generate an indirect memory
658 * descriptor.
659 */
660 struct srp_indirect_buf *buf = (void *) cmd->add_data;
661 u32 datalen = 0;
662 int i;
663
664 fmt = SRP_DATA_DESC_INDIRECT;
665 len = sizeof (struct srp_cmd) +
666 sizeof (struct srp_indirect_buf) +
667 count * sizeof (struct srp_direct_buf);
668
669 for (i = 0; i < count; ++i) {
670 buf->desc_list[i].va =
671 cpu_to_be64(sg_dma_address(&scat[i]));
672 buf->desc_list[i].key =
673 cpu_to_be32(target->srp_host->dev->mr->rkey);
674 buf->desc_list[i].len =
675 cpu_to_be32(sg_dma_len(&scat[i]));
676 datalen += sg_dma_len(&scat[i]);
677 }
678
679 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
680 cmd->data_out_desc_cnt = count;
681 else
682 cmd->data_in_desc_cnt = count;
683
684 buf->table_desc.va =
685 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
686 buf->table_desc.key =
687 cpu_to_be32(target->srp_host->dev->mr->rkey);
688 buf->table_desc.len =
689 cpu_to_be32(count * sizeof (struct srp_direct_buf));
690
691 buf->len = cpu_to_be32(datalen);
692 }
693
694 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
695 cmd->buf_fmt = fmt << 4;
696 else
697 cmd->buf_fmt = fmt;
698
699 return len;
700 }
701
702 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
703 {
704 srp_unmap_data(req->scmnd, target, req);
705 list_move_tail(&req->list, &target->free_reqs);
706 }
707
708 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
709 {
710 struct srp_request *req;
711 struct scsi_cmnd *scmnd;
712 unsigned long flags;
713 s32 delta;
714
715 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
716
717 spin_lock_irqsave(target->scsi_host->host_lock, flags);
718
719 target->req_lim += delta;
720
721 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
722
723 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
724 if (be32_to_cpu(rsp->resp_data_len) < 4)
725 req->tsk_status = -1;
726 else
727 req->tsk_status = rsp->data[3];
728 complete(&req->done);
729 } else {
730 scmnd = req->scmnd;
731 if (!scmnd)
732 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
733 (unsigned long long) rsp->tag);
734 scmnd->result = rsp->status;
735
736 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
737 memcpy(scmnd->sense_buffer, rsp->data +
738 be32_to_cpu(rsp->resp_data_len),
739 min_t(int, be32_to_cpu(rsp->sense_data_len),
740 SCSI_SENSE_BUFFERSIZE));
741 }
742
743 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
744 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
745 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
746 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
747
748 if (!req->tsk_mgmt) {
749 scmnd->host_scribble = (void *) -1L;
750 scmnd->scsi_done(scmnd);
751
752 srp_remove_req(target, req);
753 } else
754 req->cmd_done = 1;
755 }
756
757 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
758 }
759
760 static void srp_reconnect_work(void *target_ptr)
761 {
762 struct srp_target_port *target = target_ptr;
763
764 srp_reconnect_target(target);
765 }
766
767 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
768 {
769 struct srp_iu *iu;
770 u8 opcode;
771
772 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
773
774 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
775 target->max_ti_iu_len, DMA_FROM_DEVICE);
776
777 opcode = *(u8 *) iu->buf;
778
779 if (0) {
780 int i;
781
782 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
783
784 for (i = 0; i < wc->byte_len; ++i) {
785 if (i % 8 == 0)
786 printk(KERN_ERR " [%02x] ", i);
787 printk(" %02x", ((u8 *) iu->buf)[i]);
788 if ((i + 1) % 8 == 0)
789 printk("\n");
790 }
791
792 if (wc->byte_len % 8)
793 printk("\n");
794 }
795
796 switch (opcode) {
797 case SRP_RSP:
798 srp_process_rsp(target, iu->buf);
799 break;
800
801 case SRP_T_LOGOUT:
802 /* XXX Handle target logout */
803 printk(KERN_WARNING PFX "Got target logout request\n");
804 break;
805
806 default:
807 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
808 break;
809 }
810
811 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
812 target->max_ti_iu_len, DMA_FROM_DEVICE);
813 }
814
815 static void srp_completion(struct ib_cq *cq, void *target_ptr)
816 {
817 struct srp_target_port *target = target_ptr;
818 struct ib_wc wc;
819 unsigned long flags;
820
821 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
822 while (ib_poll_cq(cq, 1, &wc) > 0) {
823 if (wc.status) {
824 printk(KERN_ERR PFX "failed %s status %d\n",
825 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
826 wc.status);
827 spin_lock_irqsave(target->scsi_host->host_lock, flags);
828 if (target->state == SRP_TARGET_LIVE)
829 schedule_work(&target->work);
830 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
831 break;
832 }
833
834 if (wc.wr_id & SRP_OP_RECV)
835 srp_handle_recv(target, &wc);
836 else
837 ++target->tx_tail;
838 }
839 }
840
841 static int __srp_post_recv(struct srp_target_port *target)
842 {
843 struct srp_iu *iu;
844 struct ib_sge list;
845 struct ib_recv_wr wr, *bad_wr;
846 unsigned int next;
847 int ret;
848
849 next = target->rx_head & (SRP_RQ_SIZE - 1);
850 wr.wr_id = next | SRP_OP_RECV;
851 iu = target->rx_ring[next];
852
853 list.addr = iu->dma;
854 list.length = iu->size;
855 list.lkey = target->srp_host->dev->mr->lkey;
856
857 wr.next = NULL;
858 wr.sg_list = &list;
859 wr.num_sge = 1;
860
861 ret = ib_post_recv(target->qp, &wr, &bad_wr);
862 if (!ret)
863 ++target->rx_head;
864
865 return ret;
866 }
867
868 static int srp_post_recv(struct srp_target_port *target)
869 {
870 unsigned long flags;
871 int ret;
872
873 spin_lock_irqsave(target->scsi_host->host_lock, flags);
874 ret = __srp_post_recv(target);
875 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
876
877 return ret;
878 }
879
880 /*
881 * Must be called with target->scsi_host->host_lock held to protect
882 * req_lim and tx_head. Lock cannot be dropped between call here and
883 * call to __srp_post_send().
884 */
885 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
886 {
887 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
888 return NULL;
889
890 if (unlikely(target->req_lim < 1)) {
891 if (printk_ratelimit())
892 printk(KERN_DEBUG PFX "Target has req_lim %d\n",
893 target->req_lim);
894 return NULL;
895 }
896
897 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
898 }
899
900 /*
901 * Must be called with target->scsi_host->host_lock held to protect
902 * req_lim and tx_head.
903 */
904 static int __srp_post_send(struct srp_target_port *target,
905 struct srp_iu *iu, int len)
906 {
907 struct ib_sge list;
908 struct ib_send_wr wr, *bad_wr;
909 int ret = 0;
910
911 list.addr = iu->dma;
912 list.length = len;
913 list.lkey = target->srp_host->dev->mr->lkey;
914
915 wr.next = NULL;
916 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
917 wr.sg_list = &list;
918 wr.num_sge = 1;
919 wr.opcode = IB_WR_SEND;
920 wr.send_flags = IB_SEND_SIGNALED;
921
922 ret = ib_post_send(target->qp, &wr, &bad_wr);
923
924 if (!ret) {
925 ++target->tx_head;
926 --target->req_lim;
927 }
928
929 return ret;
930 }
931
932 static int srp_queuecommand(struct scsi_cmnd *scmnd,
933 void (*done)(struct scsi_cmnd *))
934 {
935 struct srp_target_port *target = host_to_target(scmnd->device->host);
936 struct srp_request *req;
937 struct srp_iu *iu;
938 struct srp_cmd *cmd;
939 int len;
940
941 if (target->state == SRP_TARGET_CONNECTING)
942 goto err;
943
944 if (target->state == SRP_TARGET_DEAD ||
945 target->state == SRP_TARGET_REMOVED) {
946 scmnd->result = DID_BAD_TARGET << 16;
947 done(scmnd);
948 return 0;
949 }
950
951 iu = __srp_get_tx_iu(target);
952 if (!iu)
953 goto err;
954
955 dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
956 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
957
958 req = list_entry(target->free_reqs.next, struct srp_request, list);
959
960 scmnd->scsi_done = done;
961 scmnd->result = 0;
962 scmnd->host_scribble = (void *) (long) req->index;
963
964 cmd = iu->buf;
965 memset(cmd, 0, sizeof *cmd);
966
967 cmd->opcode = SRP_CMD;
968 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
969 cmd->tag = req->index;
970 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
971
972 req->scmnd = scmnd;
973 req->cmd = iu;
974 req->cmd_done = 0;
975 req->tsk_mgmt = NULL;
976
977 len = srp_map_data(scmnd, target, req);
978 if (len < 0) {
979 printk(KERN_ERR PFX "Failed to map data\n");
980 goto err;
981 }
982
983 if (__srp_post_recv(target)) {
984 printk(KERN_ERR PFX "Recv failed\n");
985 goto err_unmap;
986 }
987
988 dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
989 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
990
991 if (__srp_post_send(target, iu, len)) {
992 printk(KERN_ERR PFX "Send failed\n");
993 goto err_unmap;
994 }
995
996 list_move_tail(&req->list, &target->req_queue);
997
998 return 0;
999
1000 err_unmap:
1001 srp_unmap_data(scmnd, target, req);
1002
1003 err:
1004 return SCSI_MLQUEUE_HOST_BUSY;
1005 }
1006
1007 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1008 {
1009 int i;
1010
1011 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1012 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1013 target->max_ti_iu_len,
1014 GFP_KERNEL, DMA_FROM_DEVICE);
1015 if (!target->rx_ring[i])
1016 goto err;
1017 }
1018
1019 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1020 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1021 SRP_MAX_IU_LEN,
1022 GFP_KERNEL, DMA_TO_DEVICE);
1023 if (!target->tx_ring[i])
1024 goto err;
1025 }
1026
1027 return 0;
1028
1029 err:
1030 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1031 srp_free_iu(target->srp_host, target->rx_ring[i]);
1032 target->rx_ring[i] = NULL;
1033 }
1034
1035 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1036 srp_free_iu(target->srp_host, target->tx_ring[i]);
1037 target->tx_ring[i] = NULL;
1038 }
1039
1040 return -ENOMEM;
1041 }
1042
1043 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1044 struct ib_cm_event *event,
1045 struct srp_target_port *target)
1046 {
1047 struct ib_class_port_info *cpi;
1048 int opcode;
1049
1050 switch (event->param.rej_rcvd.reason) {
1051 case IB_CM_REJ_PORT_CM_REDIRECT:
1052 cpi = event->param.rej_rcvd.ari;
1053 target->path.dlid = cpi->redirect_lid;
1054 target->path.pkey = cpi->redirect_pkey;
1055 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1056 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1057
1058 target->status = target->path.dlid ?
1059 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1060 break;
1061
1062 case IB_CM_REJ_PORT_REDIRECT:
1063 if (topspin_workarounds &&
1064 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1065 /*
1066 * Topspin/Cisco SRP gateways incorrectly send
1067 * reject reason code 25 when they mean 24
1068 * (port redirect).
1069 */
1070 memcpy(target->path.dgid.raw,
1071 event->param.rej_rcvd.ari, 16);
1072
1073 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1074 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1075 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1076
1077 target->status = SRP_PORT_REDIRECT;
1078 } else {
1079 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1080 target->status = -ECONNRESET;
1081 }
1082 break;
1083
1084 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1085 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1086 target->status = -ECONNRESET;
1087 break;
1088
1089 case IB_CM_REJ_CONSUMER_DEFINED:
1090 opcode = *(u8 *) event->private_data;
1091 if (opcode == SRP_LOGIN_REJ) {
1092 struct srp_login_rej *rej = event->private_data;
1093 u32 reason = be32_to_cpu(rej->reason);
1094
1095 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1096 printk(KERN_WARNING PFX
1097 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1098 else
1099 printk(KERN_WARNING PFX
1100 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1101 } else
1102 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1103 " opcode 0x%02x\n", opcode);
1104 target->status = -ECONNRESET;
1105 break;
1106
1107 default:
1108 printk(KERN_WARNING " REJ reason 0x%x\n",
1109 event->param.rej_rcvd.reason);
1110 target->status = -ECONNRESET;
1111 }
1112 }
1113
1114 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1115 {
1116 struct srp_target_port *target = cm_id->context;
1117 struct ib_qp_attr *qp_attr = NULL;
1118 int attr_mask = 0;
1119 int comp = 0;
1120 int opcode = 0;
1121
1122 switch (event->event) {
1123 case IB_CM_REQ_ERROR:
1124 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1125 comp = 1;
1126 target->status = -ECONNRESET;
1127 break;
1128
1129 case IB_CM_REP_RECEIVED:
1130 comp = 1;
1131 opcode = *(u8 *) event->private_data;
1132
1133 if (opcode == SRP_LOGIN_RSP) {
1134 struct srp_login_rsp *rsp = event->private_data;
1135
1136 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1137 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1138
1139 target->scsi_host->can_queue = min(target->req_lim,
1140 target->scsi_host->can_queue);
1141 } else {
1142 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1143 target->status = -ECONNRESET;
1144 break;
1145 }
1146
1147 target->status = srp_alloc_iu_bufs(target);
1148 if (target->status)
1149 break;
1150
1151 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1152 if (!qp_attr) {
1153 target->status = -ENOMEM;
1154 break;
1155 }
1156
1157 qp_attr->qp_state = IB_QPS_RTR;
1158 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1159 if (target->status)
1160 break;
1161
1162 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1163 if (target->status)
1164 break;
1165
1166 target->status = srp_post_recv(target);
1167 if (target->status)
1168 break;
1169
1170 qp_attr->qp_state = IB_QPS_RTS;
1171 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1172 if (target->status)
1173 break;
1174
1175 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1176 if (target->status)
1177 break;
1178
1179 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1180 if (target->status)
1181 break;
1182
1183 break;
1184
1185 case IB_CM_REJ_RECEIVED:
1186 printk(KERN_DEBUG PFX "REJ received\n");
1187 comp = 1;
1188
1189 srp_cm_rej_handler(cm_id, event, target);
1190 break;
1191
1192 case IB_CM_MRA_RECEIVED:
1193 printk(KERN_ERR PFX "MRA received\n");
1194 break;
1195
1196 case IB_CM_DREP_RECEIVED:
1197 break;
1198
1199 case IB_CM_TIMEWAIT_EXIT:
1200 printk(KERN_ERR PFX "connection closed\n");
1201
1202 comp = 1;
1203 target->status = 0;
1204 break;
1205
1206 default:
1207 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1208 break;
1209 }
1210
1211 if (comp)
1212 complete(&target->done);
1213
1214 kfree(qp_attr);
1215
1216 return 0;
1217 }
1218
1219 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1220 struct srp_request *req, u8 func)
1221 {
1222 struct srp_iu *iu;
1223 struct srp_tsk_mgmt *tsk_mgmt;
1224
1225 spin_lock_irq(target->scsi_host->host_lock);
1226
1227 if (target->state == SRP_TARGET_DEAD ||
1228 target->state == SRP_TARGET_REMOVED) {
1229 req->scmnd->result = DID_BAD_TARGET << 16;
1230 goto out;
1231 }
1232
1233 init_completion(&req->done);
1234
1235 iu = __srp_get_tx_iu(target);
1236 if (!iu)
1237 goto out;
1238
1239 tsk_mgmt = iu->buf;
1240 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1241
1242 tsk_mgmt->opcode = SRP_TSK_MGMT;
1243 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1244 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1245 tsk_mgmt->tsk_mgmt_func = func;
1246 tsk_mgmt->task_tag = req->index;
1247
1248 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1249 goto out;
1250
1251 req->tsk_mgmt = iu;
1252
1253 spin_unlock_irq(target->scsi_host->host_lock);
1254
1255 if (!wait_for_completion_timeout(&req->done,
1256 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1257 return -1;
1258
1259 return 0;
1260
1261 out:
1262 spin_unlock_irq(target->scsi_host->host_lock);
1263 return -1;
1264 }
1265
1266 static int srp_find_req(struct srp_target_port *target,
1267 struct scsi_cmnd *scmnd,
1268 struct srp_request **req)
1269 {
1270 if (scmnd->host_scribble == (void *) -1L)
1271 return -1;
1272
1273 *req = &target->req_ring[(long) scmnd->host_scribble];
1274
1275 return 0;
1276 }
1277
1278 static int srp_abort(struct scsi_cmnd *scmnd)
1279 {
1280 struct srp_target_port *target = host_to_target(scmnd->device->host);
1281 struct srp_request *req;
1282 int ret = SUCCESS;
1283
1284 printk(KERN_ERR "SRP abort called\n");
1285
1286 if (srp_find_req(target, scmnd, &req))
1287 return FAILED;
1288 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1289 return FAILED;
1290
1291 spin_lock_irq(target->scsi_host->host_lock);
1292
1293 if (req->cmd_done) {
1294 srp_remove_req(target, req);
1295 scmnd->scsi_done(scmnd);
1296 } else if (!req->tsk_status) {
1297 srp_remove_req(target, req);
1298 scmnd->result = DID_ABORT << 16;
1299 } else
1300 ret = FAILED;
1301
1302 spin_unlock_irq(target->scsi_host->host_lock);
1303
1304 return ret;
1305 }
1306
1307 static int srp_reset_device(struct scsi_cmnd *scmnd)
1308 {
1309 struct srp_target_port *target = host_to_target(scmnd->device->host);
1310 struct srp_request *req, *tmp;
1311
1312 printk(KERN_ERR "SRP reset_device called\n");
1313
1314 if (srp_find_req(target, scmnd, &req))
1315 return FAILED;
1316 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1317 return FAILED;
1318 if (req->tsk_status)
1319 return FAILED;
1320
1321 spin_lock_irq(target->scsi_host->host_lock);
1322
1323 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1324 if (req->scmnd->device == scmnd->device) {
1325 req->scmnd->result = DID_RESET << 16;
1326 req->scmnd->scsi_done(req->scmnd);
1327 srp_remove_req(target, req);
1328 }
1329
1330 spin_unlock_irq(target->scsi_host->host_lock);
1331
1332 return SUCCESS;
1333 }
1334
1335 static int srp_reset_host(struct scsi_cmnd *scmnd)
1336 {
1337 struct srp_target_port *target = host_to_target(scmnd->device->host);
1338 int ret = FAILED;
1339
1340 printk(KERN_ERR PFX "SRP reset_host called\n");
1341
1342 if (!srp_reconnect_target(target))
1343 ret = SUCCESS;
1344
1345 return ret;
1346 }
1347
1348 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1349 {
1350 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1351
1352 if (target->state == SRP_TARGET_DEAD ||
1353 target->state == SRP_TARGET_REMOVED)
1354 return -ENODEV;
1355
1356 return sprintf(buf, "0x%016llx\n",
1357 (unsigned long long) be64_to_cpu(target->id_ext));
1358 }
1359
1360 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1361 {
1362 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1363
1364 if (target->state == SRP_TARGET_DEAD ||
1365 target->state == SRP_TARGET_REMOVED)
1366 return -ENODEV;
1367
1368 return sprintf(buf, "0x%016llx\n",
1369 (unsigned long long) be64_to_cpu(target->ioc_guid));
1370 }
1371
1372 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1373 {
1374 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1375
1376 if (target->state == SRP_TARGET_DEAD ||
1377 target->state == SRP_TARGET_REMOVED)
1378 return -ENODEV;
1379
1380 return sprintf(buf, "0x%016llx\n",
1381 (unsigned long long) be64_to_cpu(target->service_id));
1382 }
1383
1384 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1385 {
1386 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1387
1388 if (target->state == SRP_TARGET_DEAD ||
1389 target->state == SRP_TARGET_REMOVED)
1390 return -ENODEV;
1391
1392 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1393 }
1394
1395 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1396 {
1397 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1398
1399 if (target->state == SRP_TARGET_DEAD ||
1400 target->state == SRP_TARGET_REMOVED)
1401 return -ENODEV;
1402
1403 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1404 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1405 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1406 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1407 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1408 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1409 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1410 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1411 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1412 }
1413
1414 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1415 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1416 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1417 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1418 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1419
1420 static struct class_device_attribute *srp_host_attrs[] = {
1421 &class_device_attr_id_ext,
1422 &class_device_attr_ioc_guid,
1423 &class_device_attr_service_id,
1424 &class_device_attr_pkey,
1425 &class_device_attr_dgid,
1426 NULL
1427 };
1428
1429 static struct scsi_host_template srp_template = {
1430 .module = THIS_MODULE,
1431 .name = DRV_NAME,
1432 .info = srp_target_info,
1433 .queuecommand = srp_queuecommand,
1434 .eh_abort_handler = srp_abort,
1435 .eh_device_reset_handler = srp_reset_device,
1436 .eh_host_reset_handler = srp_reset_host,
1437 .can_queue = SRP_SQ_SIZE,
1438 .this_id = -1,
1439 .sg_tablesize = SRP_MAX_INDIRECT,
1440 .cmd_per_lun = SRP_SQ_SIZE,
1441 .use_clustering = ENABLE_CLUSTERING,
1442 .shost_attrs = srp_host_attrs
1443 };
1444
1445 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1446 {
1447 sprintf(target->target_name, "SRP.T10:%016llX",
1448 (unsigned long long) be64_to_cpu(target->id_ext));
1449
1450 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1451 return -ENODEV;
1452
1453 spin_lock(&host->target_lock);
1454 list_add_tail(&target->list, &host->target_list);
1455 spin_unlock(&host->target_lock);
1456
1457 target->state = SRP_TARGET_LIVE;
1458
1459 scsi_scan_target(&target->scsi_host->shost_gendev,
1460 0, target->scsi_id, SCAN_WILD_CARD, 0);
1461
1462 return 0;
1463 }
1464
1465 static void srp_release_class_dev(struct class_device *class_dev)
1466 {
1467 struct srp_host *host =
1468 container_of(class_dev, struct srp_host, class_dev);
1469
1470 complete(&host->released);
1471 }
1472
1473 static struct class srp_class = {
1474 .name = "infiniband_srp",
1475 .release = srp_release_class_dev
1476 };
1477
1478 /*
1479 * Target ports are added by writing
1480 *
1481 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1482 * pkey=<P_Key>,service_id=<service ID>
1483 *
1484 * to the add_target sysfs attribute.
1485 */
1486 enum {
1487 SRP_OPT_ERR = 0,
1488 SRP_OPT_ID_EXT = 1 << 0,
1489 SRP_OPT_IOC_GUID = 1 << 1,
1490 SRP_OPT_DGID = 1 << 2,
1491 SRP_OPT_PKEY = 1 << 3,
1492 SRP_OPT_SERVICE_ID = 1 << 4,
1493 SRP_OPT_MAX_SECT = 1 << 5,
1494 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1495 SRP_OPT_IOC_GUID |
1496 SRP_OPT_DGID |
1497 SRP_OPT_PKEY |
1498 SRP_OPT_SERVICE_ID),
1499 };
1500
1501 static match_table_t srp_opt_tokens = {
1502 { SRP_OPT_ID_EXT, "id_ext=%s" },
1503 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1504 { SRP_OPT_DGID, "dgid=%s" },
1505 { SRP_OPT_PKEY, "pkey=%x" },
1506 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1507 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1508 { SRP_OPT_ERR, NULL }
1509 };
1510
1511 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1512 {
1513 char *options, *sep_opt;
1514 char *p;
1515 char dgid[3];
1516 substring_t args[MAX_OPT_ARGS];
1517 int opt_mask = 0;
1518 int token;
1519 int ret = -EINVAL;
1520 int i;
1521
1522 options = kstrdup(buf, GFP_KERNEL);
1523 if (!options)
1524 return -ENOMEM;
1525
1526 sep_opt = options;
1527 while ((p = strsep(&sep_opt, ",")) != NULL) {
1528 if (!*p)
1529 continue;
1530
1531 token = match_token(p, srp_opt_tokens, args);
1532 opt_mask |= token;
1533
1534 switch (token) {
1535 case SRP_OPT_ID_EXT:
1536 p = match_strdup(args);
1537 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1538 kfree(p);
1539 break;
1540
1541 case SRP_OPT_IOC_GUID:
1542 p = match_strdup(args);
1543 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1544 kfree(p);
1545 break;
1546
1547 case SRP_OPT_DGID:
1548 p = match_strdup(args);
1549 if (strlen(p) != 32) {
1550 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1551 kfree(p);
1552 goto out;
1553 }
1554
1555 for (i = 0; i < 16; ++i) {
1556 strlcpy(dgid, p + i * 2, 3);
1557 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1558 }
1559 kfree(p);
1560 break;
1561
1562 case SRP_OPT_PKEY:
1563 if (match_hex(args, &token)) {
1564 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1565 goto out;
1566 }
1567 target->path.pkey = cpu_to_be16(token);
1568 break;
1569
1570 case SRP_OPT_SERVICE_ID:
1571 p = match_strdup(args);
1572 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1573 kfree(p);
1574 break;
1575
1576 case SRP_OPT_MAX_SECT:
1577 if (match_int(args, &token)) {
1578 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1579 goto out;
1580 }
1581 target->scsi_host->max_sectors = token;
1582 break;
1583
1584 default:
1585 printk(KERN_WARNING PFX "unknown parameter or missing value "
1586 "'%s' in target creation request\n", p);
1587 goto out;
1588 }
1589 }
1590
1591 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1592 ret = 0;
1593 else
1594 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1595 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1596 !(srp_opt_tokens[i].token & opt_mask))
1597 printk(KERN_WARNING PFX "target creation request is "
1598 "missing parameter '%s'\n",
1599 srp_opt_tokens[i].pattern);
1600
1601 out:
1602 kfree(options);
1603 return ret;
1604 }
1605
1606 static ssize_t srp_create_target(struct class_device *class_dev,
1607 const char *buf, size_t count)
1608 {
1609 struct srp_host *host =
1610 container_of(class_dev, struct srp_host, class_dev);
1611 struct Scsi_Host *target_host;
1612 struct srp_target_port *target;
1613 int ret;
1614 int i;
1615
1616 target_host = scsi_host_alloc(&srp_template,
1617 sizeof (struct srp_target_port));
1618 if (!target_host)
1619 return -ENOMEM;
1620
1621 target_host->max_lun = SRP_MAX_LUN;
1622
1623 target = host_to_target(target_host);
1624 memset(target, 0, sizeof *target);
1625
1626 target->scsi_host = target_host;
1627 target->srp_host = host;
1628
1629 INIT_WORK(&target->work, srp_reconnect_work, target);
1630
1631 INIT_LIST_HEAD(&target->free_reqs);
1632 INIT_LIST_HEAD(&target->req_queue);
1633 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1634 target->req_ring[i].index = i;
1635 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1636 }
1637
1638 ret = srp_parse_options(buf, target);
1639 if (ret)
1640 goto err;
1641
1642 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1643
1644 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1645 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1646 (unsigned long long) be64_to_cpu(target->id_ext),
1647 (unsigned long long) be64_to_cpu(target->ioc_guid),
1648 be16_to_cpu(target->path.pkey),
1649 (unsigned long long) be64_to_cpu(target->service_id),
1650 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1651 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1652 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1653 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1654 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1655 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1656 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1657 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1658
1659 ret = srp_create_target_ib(target);
1660 if (ret)
1661 goto err;
1662
1663 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1664 if (IS_ERR(target->cm_id)) {
1665 ret = PTR_ERR(target->cm_id);
1666 goto err_free;
1667 }
1668
1669 ret = srp_connect_target(target);
1670 if (ret) {
1671 printk(KERN_ERR PFX "Connection failed\n");
1672 goto err_cm_id;
1673 }
1674
1675 ret = srp_add_target(host, target);
1676 if (ret)
1677 goto err_disconnect;
1678
1679 return count;
1680
1681 err_disconnect:
1682 srp_disconnect_target(target);
1683
1684 err_cm_id:
1685 ib_destroy_cm_id(target->cm_id);
1686
1687 err_free:
1688 srp_free_target_ib(target);
1689
1690 err:
1691 scsi_host_put(target_host);
1692
1693 return ret;
1694 }
1695
1696 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1697
1698 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1699 {
1700 struct srp_host *host =
1701 container_of(class_dev, struct srp_host, class_dev);
1702
1703 return sprintf(buf, "%s\n", host->dev->dev->name);
1704 }
1705
1706 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1707
1708 static ssize_t show_port(struct class_device *class_dev, char *buf)
1709 {
1710 struct srp_host *host =
1711 container_of(class_dev, struct srp_host, class_dev);
1712
1713 return sprintf(buf, "%d\n", host->port);
1714 }
1715
1716 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1717
1718 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1719 {
1720 struct srp_host *host;
1721
1722 host = kzalloc(sizeof *host, GFP_KERNEL);
1723 if (!host)
1724 return NULL;
1725
1726 INIT_LIST_HEAD(&host->target_list);
1727 spin_lock_init(&host->target_lock);
1728 init_completion(&host->released);
1729 host->dev = device;
1730 host->port = port;
1731
1732 host->initiator_port_id[7] = port;
1733 memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8);
1734
1735 host->class_dev.class = &srp_class;
1736 host->class_dev.dev = device->dev->dma_device;
1737 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1738 device->dev->name, port);
1739
1740 if (class_device_register(&host->class_dev))
1741 goto free_host;
1742 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1743 goto err_class;
1744 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1745 goto err_class;
1746 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1747 goto err_class;
1748
1749 return host;
1750
1751 err_class:
1752 class_device_unregister(&host->class_dev);
1753
1754 free_host:
1755 kfree(host);
1756
1757 return NULL;
1758 }
1759
1760 static void srp_add_one(struct ib_device *device)
1761 {
1762 struct srp_device *srp_dev;
1763 struct ib_device_attr *dev_attr;
1764 struct ib_fmr_pool_param fmr_param;
1765 struct srp_host *host;
1766 int s, e, p;
1767
1768 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1769 if (!dev_attr)
1770 return;
1771
1772 if (ib_query_device(device, dev_attr)) {
1773 printk(KERN_WARNING PFX "Query device failed for %s\n",
1774 device->name);
1775 goto free_attr;
1776 }
1777
1778 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1779 if (!srp_dev)
1780 goto free_attr;
1781
1782 /*
1783 * Use the smallest page size supported by the HCA, down to a
1784 * minimum of 512 bytes (which is the smallest sector that a
1785 * SCSI command will ever carry).
1786 */
1787 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1788 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
1789 srp_dev->fmr_page_mask = ~((unsigned long) srp_dev->fmr_page_size - 1);
1790
1791 INIT_LIST_HEAD(&srp_dev->dev_list);
1792
1793 srp_dev->dev = device;
1794 srp_dev->pd = ib_alloc_pd(device);
1795 if (IS_ERR(srp_dev->pd))
1796 goto free_dev;
1797
1798 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1799 IB_ACCESS_LOCAL_WRITE |
1800 IB_ACCESS_REMOTE_READ |
1801 IB_ACCESS_REMOTE_WRITE);
1802 if (IS_ERR(srp_dev->mr))
1803 goto err_pd;
1804
1805 memset(&fmr_param, 0, sizeof fmr_param);
1806 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
1807 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
1808 fmr_param.cache = 1;
1809 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1810 fmr_param.page_shift = srp_dev->fmr_page_shift;
1811 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
1812 IB_ACCESS_REMOTE_WRITE |
1813 IB_ACCESS_REMOTE_READ);
1814
1815 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1816 if (IS_ERR(srp_dev->fmr_pool))
1817 srp_dev->fmr_pool = NULL;
1818
1819 if (device->node_type == IB_NODE_SWITCH) {
1820 s = 0;
1821 e = 0;
1822 } else {
1823 s = 1;
1824 e = device->phys_port_cnt;
1825 }
1826
1827 for (p = s; p <= e; ++p) {
1828 host = srp_add_port(srp_dev, p);
1829 if (host)
1830 list_add_tail(&host->list, &srp_dev->dev_list);
1831 }
1832
1833 ib_set_client_data(device, &srp_client, srp_dev);
1834
1835 goto free_attr;
1836
1837 err_pd:
1838 ib_dealloc_pd(srp_dev->pd);
1839
1840 free_dev:
1841 kfree(srp_dev);
1842
1843 free_attr:
1844 kfree(dev_attr);
1845 }
1846
1847 static void srp_remove_one(struct ib_device *device)
1848 {
1849 struct srp_device *srp_dev;
1850 struct srp_host *host, *tmp_host;
1851 LIST_HEAD(target_list);
1852 struct srp_target_port *target, *tmp_target;
1853
1854 srp_dev = ib_get_client_data(device, &srp_client);
1855
1856 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1857 class_device_unregister(&host->class_dev);
1858 /*
1859 * Wait for the sysfs entry to go away, so that no new
1860 * target ports can be created.
1861 */
1862 wait_for_completion(&host->released);
1863
1864 /*
1865 * Mark all target ports as removed, so we stop queueing
1866 * commands and don't try to reconnect.
1867 */
1868 spin_lock(&host->target_lock);
1869 list_for_each_entry(target, &host->target_list, list) {
1870 spin_lock_irq(target->scsi_host->host_lock);
1871 target->state = SRP_TARGET_REMOVED;
1872 spin_unlock_irq(target->scsi_host->host_lock);
1873 }
1874 spin_unlock(&host->target_lock);
1875
1876 /*
1877 * Wait for any reconnection tasks that may have
1878 * started before we marked our target ports as
1879 * removed, and any target port removal tasks.
1880 */
1881 flush_scheduled_work();
1882
1883 list_for_each_entry_safe(target, tmp_target,
1884 &host->target_list, list) {
1885 scsi_remove_host(target->scsi_host);
1886 srp_disconnect_target(target);
1887 ib_destroy_cm_id(target->cm_id);
1888 srp_free_target_ib(target);
1889 scsi_host_put(target->scsi_host);
1890 }
1891
1892 kfree(host);
1893 }
1894
1895 if (srp_dev->fmr_pool)
1896 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1897 ib_dereg_mr(srp_dev->mr);
1898 ib_dealloc_pd(srp_dev->pd);
1899
1900 kfree(srp_dev);
1901 }
1902
1903 static int __init srp_init_module(void)
1904 {
1905 int ret;
1906
1907 ret = class_register(&srp_class);
1908 if (ret) {
1909 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1910 return ret;
1911 }
1912
1913 ret = ib_register_client(&srp_client);
1914 if (ret) {
1915 printk(KERN_ERR PFX "couldn't register IB client\n");
1916 class_unregister(&srp_class);
1917 return ret;
1918 }
1919
1920 return 0;
1921 }
1922
1923 static void __exit srp_cleanup_module(void)
1924 {
1925 ib_unregister_client(&srp_client);
1926 class_unregister(&srp_class);
1927 }
1928
1929 module_init(srp_init_module);
1930 module_exit(srp_cleanup_module);
x86 "subsystem" repository