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[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
33 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/err.h>
37 #include <linux/string.h>
38 #include <linux/parser.h>
39 #include <linux/random.h>
40 #include <linux/jiffies.h>
41
42 #include <asm/atomic.h>
43
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_dbg.h>
47 #include <scsi/srp.h>
48 #include <scsi/scsi_transport_srp.h>
49
50 #include "ib_srp.h"
51
52 #define DRV_NAME "ib_srp"
53 #define PFX DRV_NAME ": "
54 #define DRV_VERSION "0.2"
55 #define DRV_RELDATE "November 1, 2005"
56
57 MODULE_AUTHOR("Roland Dreier");
58 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
59 "v" DRV_VERSION " (" DRV_RELDATE ")");
60 MODULE_LICENSE("Dual BSD/GPL");
61
62 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
63 static int srp_max_iu_len;
64
65 module_param(srp_sg_tablesize, int, 0444);
66 MODULE_PARM_DESC(srp_sg_tablesize,
67 "Max number of gather/scatter entries per I/O (default is 12, max 255)");
68
69 static int topspin_workarounds = 1;
70
71 module_param(topspin_workarounds, int, 0444);
72 MODULE_PARM_DESC(topspin_workarounds,
73 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
74
75 static int mellanox_workarounds = 1;
76
77 module_param(mellanox_workarounds, int, 0444);
78 MODULE_PARM_DESC(mellanox_workarounds,
79 "Enable workarounds for Mellanox SRP target bugs if != 0");
80
81 static void srp_add_one(struct ib_device *device);
82 static void srp_remove_one(struct ib_device *device);
83 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
84 static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
85 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
86
87 static struct scsi_transport_template *ib_srp_transport_template;
88
89 static struct ib_client srp_client = {
90 .name = "srp",
91 .add = srp_add_one,
92 .remove = srp_remove_one
93 };
94
95 static struct ib_sa_client srp_sa_client;
96
97 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
98 {
99 return (struct srp_target_port *) host->hostdata;
100 }
101
102 static const char *srp_target_info(struct Scsi_Host *host)
103 {
104 return host_to_target(host)->target_name;
105 }
106
107 static int srp_target_is_topspin(struct srp_target_port *target)
108 {
109 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
110 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
111
112 return topspin_workarounds &&
113 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
114 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
115 }
116
117 static int srp_target_is_mellanox(struct srp_target_port *target)
118 {
119 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
120
121 return mellanox_workarounds &&
122 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
123 }
124
125 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
126 gfp_t gfp_mask,
127 enum dma_data_direction direction)
128 {
129 struct srp_iu *iu;
130
131 iu = kmalloc(sizeof *iu, gfp_mask);
132 if (!iu)
133 goto out;
134
135 iu->buf = kzalloc(size, gfp_mask);
136 if (!iu->buf)
137 goto out_free_iu;
138
139 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
140 direction);
141 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
142 goto out_free_buf;
143
144 iu->size = size;
145 iu->direction = direction;
146
147 return iu;
148
149 out_free_buf:
150 kfree(iu->buf);
151 out_free_iu:
152 kfree(iu);
153 out:
154 return NULL;
155 }
156
157 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
158 {
159 if (!iu)
160 return;
161
162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
163 iu->direction);
164 kfree(iu->buf);
165 kfree(iu);
166 }
167
168 static void srp_qp_event(struct ib_event *event, void *context)
169 {
170 printk(KERN_ERR PFX "QP event %d\n", event->event);
171 }
172
173 static int srp_init_qp(struct srp_target_port *target,
174 struct ib_qp *qp)
175 {
176 struct ib_qp_attr *attr;
177 int ret;
178
179 attr = kmalloc(sizeof *attr, GFP_KERNEL);
180 if (!attr)
181 return -ENOMEM;
182
183 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
184 target->srp_host->port,
185 be16_to_cpu(target->path.pkey),
186 &attr->pkey_index);
187 if (ret)
188 goto out;
189
190 attr->qp_state = IB_QPS_INIT;
191 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
192 IB_ACCESS_REMOTE_WRITE);
193 attr->port_num = target->srp_host->port;
194
195 ret = ib_modify_qp(qp, attr,
196 IB_QP_STATE |
197 IB_QP_PKEY_INDEX |
198 IB_QP_ACCESS_FLAGS |
199 IB_QP_PORT);
200
201 out:
202 kfree(attr);
203 return ret;
204 }
205
206 static int srp_new_cm_id(struct srp_target_port *target)
207 {
208 struct ib_cm_id *new_cm_id;
209
210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
211 srp_cm_handler, target);
212 if (IS_ERR(new_cm_id))
213 return PTR_ERR(new_cm_id);
214
215 if (target->cm_id)
216 ib_destroy_cm_id(target->cm_id);
217 target->cm_id = new_cm_id;
218
219 return 0;
220 }
221
222 static int srp_create_target_ib(struct srp_target_port *target)
223 {
224 struct ib_qp_init_attr *init_attr;
225 int ret;
226
227 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
228 if (!init_attr)
229 return -ENOMEM;
230
231 target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
232 srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
233 if (IS_ERR(target->recv_cq)) {
234 ret = PTR_ERR(target->recv_cq);
235 goto err;
236 }
237
238 target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
239 srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
240 if (IS_ERR(target->send_cq)) {
241 ret = PTR_ERR(target->send_cq);
242 goto err_recv_cq;
243 }
244
245 ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP);
246
247 init_attr->event_handler = srp_qp_event;
248 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
249 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
250 init_attr->cap.max_recv_sge = 1;
251 init_attr->cap.max_send_sge = 1;
252 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
253 init_attr->qp_type = IB_QPT_RC;
254 init_attr->send_cq = target->send_cq;
255 init_attr->recv_cq = target->recv_cq;
256
257 target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
258 if (IS_ERR(target->qp)) {
259 ret = PTR_ERR(target->qp);
260 goto err_send_cq;
261 }
262
263 ret = srp_init_qp(target, target->qp);
264 if (ret)
265 goto err_qp;
266
267 kfree(init_attr);
268 return 0;
269
270 err_qp:
271 ib_destroy_qp(target->qp);
272
273 err_send_cq:
274 ib_destroy_cq(target->send_cq);
275
276 err_recv_cq:
277 ib_destroy_cq(target->recv_cq);
278
279 err:
280 kfree(init_attr);
281 return ret;
282 }
283
284 static void srp_free_target_ib(struct srp_target_port *target)
285 {
286 int i;
287
288 ib_destroy_qp(target->qp);
289 ib_destroy_cq(target->send_cq);
290 ib_destroy_cq(target->recv_cq);
291
292 for (i = 0; i < SRP_RQ_SIZE; ++i)
293 srp_free_iu(target->srp_host, target->rx_ring[i]);
294 for (i = 0; i < SRP_SQ_SIZE; ++i)
295 srp_free_iu(target->srp_host, target->tx_ring[i]);
296 }
297
298 static void srp_path_rec_completion(int status,
299 struct ib_sa_path_rec *pathrec,
300 void *target_ptr)
301 {
302 struct srp_target_port *target = target_ptr;
303
304 target->status = status;
305 if (status)
306 shost_printk(KERN_ERR, target->scsi_host,
307 PFX "Got failed path rec status %d\n", status);
308 else
309 target->path = *pathrec;
310 complete(&target->done);
311 }
312
313 static int srp_lookup_path(struct srp_target_port *target)
314 {
315 target->path.numb_path = 1;
316
317 init_completion(&target->done);
318
319 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
320 target->srp_host->srp_dev->dev,
321 target->srp_host->port,
322 &target->path,
323 IB_SA_PATH_REC_SERVICE_ID |
324 IB_SA_PATH_REC_DGID |
325 IB_SA_PATH_REC_SGID |
326 IB_SA_PATH_REC_NUMB_PATH |
327 IB_SA_PATH_REC_PKEY,
328 SRP_PATH_REC_TIMEOUT_MS,
329 GFP_KERNEL,
330 srp_path_rec_completion,
331 target, &target->path_query);
332 if (target->path_query_id < 0)
333 return target->path_query_id;
334
335 wait_for_completion(&target->done);
336
337 if (target->status < 0)
338 shost_printk(KERN_WARNING, target->scsi_host,
339 PFX "Path record query failed\n");
340
341 return target->status;
342 }
343
344 static int srp_send_req(struct srp_target_port *target)
345 {
346 struct {
347 struct ib_cm_req_param param;
348 struct srp_login_req priv;
349 } *req = NULL;
350 int status;
351
352 req = kzalloc(sizeof *req, GFP_KERNEL);
353 if (!req)
354 return -ENOMEM;
355
356 req->param.primary_path = &target->path;
357 req->param.alternate_path = NULL;
358 req->param.service_id = target->service_id;
359 req->param.qp_num = target->qp->qp_num;
360 req->param.qp_type = target->qp->qp_type;
361 req->param.private_data = &req->priv;
362 req->param.private_data_len = sizeof req->priv;
363 req->param.flow_control = 1;
364
365 get_random_bytes(&req->param.starting_psn, 4);
366 req->param.starting_psn &= 0xffffff;
367
368 /*
369 * Pick some arbitrary defaults here; we could make these
370 * module parameters if anyone cared about setting them.
371 */
372 req->param.responder_resources = 4;
373 req->param.remote_cm_response_timeout = 20;
374 req->param.local_cm_response_timeout = 20;
375 req->param.retry_count = 7;
376 req->param.rnr_retry_count = 7;
377 req->param.max_cm_retries = 15;
378
379 req->priv.opcode = SRP_LOGIN_REQ;
380 req->priv.tag = 0;
381 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
382 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
383 SRP_BUF_FORMAT_INDIRECT);
384 /*
385 * In the published SRP specification (draft rev. 16a), the
386 * port identifier format is 8 bytes of ID extension followed
387 * by 8 bytes of GUID. Older drafts put the two halves in the
388 * opposite order, so that the GUID comes first.
389 *
390 * Targets conforming to these obsolete drafts can be
391 * recognized by the I/O Class they report.
392 */
393 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
394 memcpy(req->priv.initiator_port_id,
395 &target->path.sgid.global.interface_id, 8);
396 memcpy(req->priv.initiator_port_id + 8,
397 &target->initiator_ext, 8);
398 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
399 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
400 } else {
401 memcpy(req->priv.initiator_port_id,
402 &target->initiator_ext, 8);
403 memcpy(req->priv.initiator_port_id + 8,
404 &target->path.sgid.global.interface_id, 8);
405 memcpy(req->priv.target_port_id, &target->id_ext, 8);
406 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
407 }
408
409 /*
410 * Topspin/Cisco SRP targets will reject our login unless we
411 * zero out the first 8 bytes of our initiator port ID and set
412 * the second 8 bytes to the local node GUID.
413 */
414 if (srp_target_is_topspin(target)) {
415 shost_printk(KERN_DEBUG, target->scsi_host,
416 PFX "Topspin/Cisco initiator port ID workaround "
417 "activated for target GUID %016llx\n",
418 (unsigned long long) be64_to_cpu(target->ioc_guid));
419 memset(req->priv.initiator_port_id, 0, 8);
420 memcpy(req->priv.initiator_port_id + 8,
421 &target->srp_host->srp_dev->dev->node_guid, 8);
422 }
423
424 status = ib_send_cm_req(target->cm_id, &req->param);
425
426 kfree(req);
427
428 return status;
429 }
430
431 static void srp_disconnect_target(struct srp_target_port *target)
432 {
433 /* XXX should send SRP_I_LOGOUT request */
434
435 init_completion(&target->done);
436 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
437 shost_printk(KERN_DEBUG, target->scsi_host,
438 PFX "Sending CM DREQ failed\n");
439 return;
440 }
441 wait_for_completion(&target->done);
442 }
443
444 static void srp_remove_work(struct work_struct *work)
445 {
446 struct srp_target_port *target =
447 container_of(work, struct srp_target_port, work);
448
449 spin_lock_irq(target->scsi_host->host_lock);
450 if (target->state != SRP_TARGET_DEAD) {
451 spin_unlock_irq(target->scsi_host->host_lock);
452 return;
453 }
454 target->state = SRP_TARGET_REMOVED;
455 spin_unlock_irq(target->scsi_host->host_lock);
456
457 spin_lock(&target->srp_host->target_lock);
458 list_del(&target->list);
459 spin_unlock(&target->srp_host->target_lock);
460
461 srp_remove_host(target->scsi_host);
462 scsi_remove_host(target->scsi_host);
463 ib_destroy_cm_id(target->cm_id);
464 srp_free_target_ib(target);
465 scsi_host_put(target->scsi_host);
466 }
467
468 static int srp_connect_target(struct srp_target_port *target)
469 {
470 int retries = 3;
471 int ret;
472
473 ret = srp_lookup_path(target);
474 if (ret)
475 return ret;
476
477 while (1) {
478 init_completion(&target->done);
479 ret = srp_send_req(target);
480 if (ret)
481 return ret;
482 wait_for_completion(&target->done);
483
484 /*
485 * The CM event handling code will set status to
486 * SRP_PORT_REDIRECT if we get a port redirect REJ
487 * back, or SRP_DLID_REDIRECT if we get a lid/qp
488 * redirect REJ back.
489 */
490 switch (target->status) {
491 case 0:
492 return 0;
493
494 case SRP_PORT_REDIRECT:
495 ret = srp_lookup_path(target);
496 if (ret)
497 return ret;
498 break;
499
500 case SRP_DLID_REDIRECT:
501 break;
502
503 case SRP_STALE_CONN:
504 /* Our current CM id was stale, and is now in timewait.
505 * Try to reconnect with a new one.
506 */
507 if (!retries-- || srp_new_cm_id(target)) {
508 shost_printk(KERN_ERR, target->scsi_host, PFX
509 "giving up on stale connection\n");
510 target->status = -ECONNRESET;
511 return target->status;
512 }
513
514 shost_printk(KERN_ERR, target->scsi_host, PFX
515 "retrying stale connection\n");
516 break;
517
518 default:
519 return target->status;
520 }
521 }
522 }
523
524 static void srp_unmap_data(struct scsi_cmnd *scmnd,
525 struct srp_target_port *target,
526 struct srp_request *req)
527 {
528 if (!scsi_sglist(scmnd) ||
529 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
530 scmnd->sc_data_direction != DMA_FROM_DEVICE))
531 return;
532
533 if (req->fmr) {
534 ib_fmr_pool_unmap(req->fmr);
535 req->fmr = NULL;
536 }
537
538 ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
539 scsi_sg_count(scmnd), scmnd->sc_data_direction);
540 }
541
542 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
543 {
544 srp_unmap_data(req->scmnd, target, req);
545 list_move_tail(&req->list, &target->free_reqs);
546 }
547
548 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
549 {
550 req->scmnd->result = DID_RESET << 16;
551 req->scmnd->scsi_done(req->scmnd);
552 srp_remove_req(target, req);
553 }
554
555 static int srp_reconnect_target(struct srp_target_port *target)
556 {
557 struct ib_qp_attr qp_attr;
558 struct srp_request *req, *tmp;
559 struct ib_wc wc;
560 int ret;
561
562 spin_lock_irq(target->scsi_host->host_lock);
563 if (target->state != SRP_TARGET_LIVE) {
564 spin_unlock_irq(target->scsi_host->host_lock);
565 return -EAGAIN;
566 }
567 target->state = SRP_TARGET_CONNECTING;
568 spin_unlock_irq(target->scsi_host->host_lock);
569
570 srp_disconnect_target(target);
571 /*
572 * Now get a new local CM ID so that we avoid confusing the
573 * target in case things are really fouled up.
574 */
575 ret = srp_new_cm_id(target);
576 if (ret)
577 goto err;
578
579 qp_attr.qp_state = IB_QPS_RESET;
580 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
581 if (ret)
582 goto err;
583
584 ret = srp_init_qp(target, target->qp);
585 if (ret)
586 goto err;
587
588 while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
589 ; /* nothing */
590 while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
591 ; /* nothing */
592
593 spin_lock_irq(target->scsi_host->host_lock);
594 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
595 srp_reset_req(target, req);
596 spin_unlock_irq(target->scsi_host->host_lock);
597
598 target->rx_head = 0;
599 target->tx_head = 0;
600 target->tx_tail = 0;
601
602 target->qp_in_error = 0;
603 ret = srp_connect_target(target);
604 if (ret)
605 goto err;
606
607 spin_lock_irq(target->scsi_host->host_lock);
608 if (target->state == SRP_TARGET_CONNECTING) {
609 ret = 0;
610 target->state = SRP_TARGET_LIVE;
611 } else
612 ret = -EAGAIN;
613 spin_unlock_irq(target->scsi_host->host_lock);
614
615 return ret;
616
617 err:
618 shost_printk(KERN_ERR, target->scsi_host,
619 PFX "reconnect failed (%d), removing target port.\n", ret);
620
621 /*
622 * We couldn't reconnect, so kill our target port off.
623 * However, we have to defer the real removal because we might
624 * be in the context of the SCSI error handler now, which
625 * would deadlock if we call scsi_remove_host().
626 */
627 spin_lock_irq(target->scsi_host->host_lock);
628 if (target->state == SRP_TARGET_CONNECTING) {
629 target->state = SRP_TARGET_DEAD;
630 INIT_WORK(&target->work, srp_remove_work);
631 schedule_work(&target->work);
632 }
633 spin_unlock_irq(target->scsi_host->host_lock);
634
635 return ret;
636 }
637
638 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
639 int sg_cnt, struct srp_request *req,
640 struct srp_direct_buf *buf)
641 {
642 u64 io_addr = 0;
643 u64 *dma_pages;
644 u32 len;
645 int page_cnt;
646 int i, j;
647 int ret;
648 struct srp_device *dev = target->srp_host->srp_dev;
649 struct ib_device *ibdev = dev->dev;
650 struct scatterlist *sg;
651
652 if (!dev->fmr_pool)
653 return -ENODEV;
654
655 if (srp_target_is_mellanox(target) &&
656 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
657 return -EINVAL;
658
659 len = page_cnt = 0;
660 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
661 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
662
663 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
664 if (i > 0)
665 return -EINVAL;
666 else
667 ++page_cnt;
668 }
669 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
670 ~dev->fmr_page_mask) {
671 if (i < sg_cnt - 1)
672 return -EINVAL;
673 else
674 ++page_cnt;
675 }
676
677 len += dma_len;
678 }
679
680 page_cnt += len >> dev->fmr_page_shift;
681 if (page_cnt > SRP_FMR_SIZE)
682 return -ENOMEM;
683
684 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
685 if (!dma_pages)
686 return -ENOMEM;
687
688 page_cnt = 0;
689 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
690 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
691
692 for (j = 0; j < dma_len; j += dev->fmr_page_size)
693 dma_pages[page_cnt++] =
694 (ib_sg_dma_address(ibdev, sg) &
695 dev->fmr_page_mask) + j;
696 }
697
698 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
699 dma_pages, page_cnt, io_addr);
700 if (IS_ERR(req->fmr)) {
701 ret = PTR_ERR(req->fmr);
702 req->fmr = NULL;
703 goto out;
704 }
705
706 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
707 ~dev->fmr_page_mask);
708 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
709 buf->len = cpu_to_be32(len);
710
711 ret = 0;
712
713 out:
714 kfree(dma_pages);
715
716 return ret;
717 }
718
719 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
720 struct srp_request *req)
721 {
722 struct scatterlist *scat;
723 struct srp_cmd *cmd = req->cmd->buf;
724 int len, nents, count;
725 u8 fmt = SRP_DATA_DESC_DIRECT;
726 struct srp_device *dev;
727 struct ib_device *ibdev;
728
729 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
730 return sizeof (struct srp_cmd);
731
732 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
733 scmnd->sc_data_direction != DMA_TO_DEVICE) {
734 shost_printk(KERN_WARNING, target->scsi_host,
735 PFX "Unhandled data direction %d\n",
736 scmnd->sc_data_direction);
737 return -EINVAL;
738 }
739
740 nents = scsi_sg_count(scmnd);
741 scat = scsi_sglist(scmnd);
742
743 dev = target->srp_host->srp_dev;
744 ibdev = dev->dev;
745
746 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
747
748 fmt = SRP_DATA_DESC_DIRECT;
749 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
750
751 if (count == 1) {
752 /*
753 * The midlayer only generated a single gather/scatter
754 * entry, or DMA mapping coalesced everything to a
755 * single entry. So a direct descriptor along with
756 * the DMA MR suffices.
757 */
758 struct srp_direct_buf *buf = (void *) cmd->add_data;
759
760 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
761 buf->key = cpu_to_be32(dev->mr->rkey);
762 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
763 } else if (srp_map_fmr(target, scat, count, req,
764 (void *) cmd->add_data)) {
765 /*
766 * FMR mapping failed, and the scatterlist has more
767 * than one entry. Generate an indirect memory
768 * descriptor.
769 */
770 struct srp_indirect_buf *buf = (void *) cmd->add_data;
771 struct scatterlist *sg;
772 u32 datalen = 0;
773 int i;
774
775 fmt = SRP_DATA_DESC_INDIRECT;
776 len = sizeof (struct srp_cmd) +
777 sizeof (struct srp_indirect_buf) +
778 count * sizeof (struct srp_direct_buf);
779
780 scsi_for_each_sg(scmnd, sg, count, i) {
781 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
782
783 buf->desc_list[i].va =
784 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
785 buf->desc_list[i].key =
786 cpu_to_be32(dev->mr->rkey);
787 buf->desc_list[i].len = cpu_to_be32(dma_len);
788 datalen += dma_len;
789 }
790
791 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
792 cmd->data_out_desc_cnt = count;
793 else
794 cmd->data_in_desc_cnt = count;
795
796 buf->table_desc.va =
797 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
798 buf->table_desc.key =
799 cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
800 buf->table_desc.len =
801 cpu_to_be32(count * sizeof (struct srp_direct_buf));
802
803 buf->len = cpu_to_be32(datalen);
804 }
805
806 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
807 cmd->buf_fmt = fmt << 4;
808 else
809 cmd->buf_fmt = fmt;
810
811 return len;
812 }
813
814 /*
815 * Must be called with target->scsi_host->host_lock held to protect
816 * req_lim and tx_head. Lock cannot be dropped between call here and
817 * call to __srp_post_send().
818 *
819 * Note:
820 * An upper limit for the number of allocated information units for each
821 * request type is:
822 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
823 * more than Scsi_Host.can_queue requests.
824 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
825 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
826 * one unanswered SRP request to an initiator.
827 */
828 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
829 enum srp_iu_type iu_type)
830 {
831 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
832 struct srp_iu *iu;
833
834 srp_send_completion(target->send_cq, target);
835
836 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
837 return NULL;
838
839 /* Initiator responses to target requests do not consume credits */
840 if (target->req_lim <= rsv && iu_type != SRP_IU_RSP) {
841 ++target->zero_req_lim;
842 return NULL;
843 }
844
845 iu = target->tx_ring[target->tx_head & SRP_SQ_MASK];
846 iu->type = iu_type;
847 return iu;
848 }
849
850 /*
851 * Must be called with target->scsi_host->host_lock held to protect
852 * req_lim and tx_head.
853 */
854 static int __srp_post_send(struct srp_target_port *target,
855 struct srp_iu *iu, int len)
856 {
857 struct ib_sge list;
858 struct ib_send_wr wr, *bad_wr;
859 int ret = 0;
860
861 list.addr = iu->dma;
862 list.length = len;
863 list.lkey = target->srp_host->srp_dev->mr->lkey;
864
865 wr.next = NULL;
866 wr.wr_id = target->tx_head & SRP_SQ_MASK;
867 wr.sg_list = &list;
868 wr.num_sge = 1;
869 wr.opcode = IB_WR_SEND;
870 wr.send_flags = IB_SEND_SIGNALED;
871
872 ret = ib_post_send(target->qp, &wr, &bad_wr);
873
874 if (!ret) {
875 ++target->tx_head;
876 if (iu->type != SRP_IU_RSP)
877 --target->req_lim;
878 }
879
880 return ret;
881 }
882
883 static int srp_post_recv(struct srp_target_port *target)
884 {
885 unsigned long flags;
886 struct srp_iu *iu;
887 struct ib_sge list;
888 struct ib_recv_wr wr, *bad_wr;
889 unsigned int next;
890 int ret;
891
892 spin_lock_irqsave(target->scsi_host->host_lock, flags);
893
894 next = target->rx_head & SRP_RQ_MASK;
895 wr.wr_id = next;
896 iu = target->rx_ring[next];
897
898 list.addr = iu->dma;
899 list.length = iu->size;
900 list.lkey = target->srp_host->srp_dev->mr->lkey;
901
902 wr.next = NULL;
903 wr.sg_list = &list;
904 wr.num_sge = 1;
905
906 ret = ib_post_recv(target->qp, &wr, &bad_wr);
907 if (!ret)
908 ++target->rx_head;
909
910 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
911
912 return ret;
913 }
914
915 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
916 {
917 struct srp_request *req;
918 struct scsi_cmnd *scmnd;
919 unsigned long flags;
920 s32 delta;
921
922 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
923
924 spin_lock_irqsave(target->scsi_host->host_lock, flags);
925
926 target->req_lim += delta;
927
928 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
929
930 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
931 if (be32_to_cpu(rsp->resp_data_len) < 4)
932 req->tsk_status = -1;
933 else
934 req->tsk_status = rsp->data[3];
935 complete(&req->done);
936 } else {
937 scmnd = req->scmnd;
938 if (!scmnd)
939 shost_printk(KERN_ERR, target->scsi_host,
940 "Null scmnd for RSP w/tag %016llx\n",
941 (unsigned long long) rsp->tag);
942 scmnd->result = rsp->status;
943
944 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
945 memcpy(scmnd->sense_buffer, rsp->data +
946 be32_to_cpu(rsp->resp_data_len),
947 min_t(int, be32_to_cpu(rsp->sense_data_len),
948 SCSI_SENSE_BUFFERSIZE));
949 }
950
951 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
952 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
953 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
954 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
955
956 if (!req->tsk_mgmt) {
957 scmnd->host_scribble = (void *) -1L;
958 scmnd->scsi_done(scmnd);
959
960 srp_remove_req(target, req);
961 } else
962 req->cmd_done = 1;
963 }
964
965 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
966 }
967
968 static int srp_response_common(struct srp_target_port *target, s32 req_delta,
969 void *rsp, int len)
970 {
971 struct ib_device *dev;
972 unsigned long flags;
973 struct srp_iu *iu;
974 int err = 1;
975
976 dev = target->srp_host->srp_dev->dev;
977
978 spin_lock_irqsave(target->scsi_host->host_lock, flags);
979 target->req_lim += req_delta;
980
981 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
982 if (!iu) {
983 shost_printk(KERN_ERR, target->scsi_host, PFX
984 "no IU available to send response\n");
985 goto out;
986 }
987
988 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
989 memcpy(iu->buf, rsp, len);
990 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
991
992 err = __srp_post_send(target, iu, len);
993 if (err)
994 shost_printk(KERN_ERR, target->scsi_host, PFX
995 "unable to post response: %d\n", err);
996
997 out:
998 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
999 return err;
1000 }
1001
1002 static void srp_process_cred_req(struct srp_target_port *target,
1003 struct srp_cred_req *req)
1004 {
1005 struct srp_cred_rsp rsp = {
1006 .opcode = SRP_CRED_RSP,
1007 .tag = req->tag,
1008 };
1009 s32 delta = be32_to_cpu(req->req_lim_delta);
1010
1011 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1012 shost_printk(KERN_ERR, target->scsi_host, PFX
1013 "problems processing SRP_CRED_REQ\n");
1014 }
1015
1016 static void srp_process_aer_req(struct srp_target_port *target,
1017 struct srp_aer_req *req)
1018 {
1019 struct srp_aer_rsp rsp = {
1020 .opcode = SRP_AER_RSP,
1021 .tag = req->tag,
1022 };
1023 s32 delta = be32_to_cpu(req->req_lim_delta);
1024
1025 shost_printk(KERN_ERR, target->scsi_host, PFX
1026 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1027
1028 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1029 shost_printk(KERN_ERR, target->scsi_host, PFX
1030 "problems processing SRP_AER_REQ\n");
1031 }
1032
1033 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1034 {
1035 struct ib_device *dev;
1036 struct srp_iu *iu;
1037 int res;
1038 u8 opcode;
1039
1040 iu = target->rx_ring[wc->wr_id];
1041
1042 dev = target->srp_host->srp_dev->dev;
1043 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1044 DMA_FROM_DEVICE);
1045
1046 opcode = *(u8 *) iu->buf;
1047
1048 if (0) {
1049 shost_printk(KERN_ERR, target->scsi_host,
1050 PFX "recv completion, opcode 0x%02x\n", opcode);
1051 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1052 iu->buf, wc->byte_len, true);
1053 }
1054
1055 switch (opcode) {
1056 case SRP_RSP:
1057 srp_process_rsp(target, iu->buf);
1058 break;
1059
1060 case SRP_CRED_REQ:
1061 srp_process_cred_req(target, iu->buf);
1062 break;
1063
1064 case SRP_AER_REQ:
1065 srp_process_aer_req(target, iu->buf);
1066 break;
1067
1068 case SRP_T_LOGOUT:
1069 /* XXX Handle target logout */
1070 shost_printk(KERN_WARNING, target->scsi_host,
1071 PFX "Got target logout request\n");
1072 break;
1073
1074 default:
1075 shost_printk(KERN_WARNING, target->scsi_host,
1076 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1077 break;
1078 }
1079
1080 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1081 DMA_FROM_DEVICE);
1082
1083 res = srp_post_recv(target);
1084 if (res != 0)
1085 shost_printk(KERN_ERR, target->scsi_host,
1086 PFX "Recv failed with error code %d\n", res);
1087 }
1088
1089 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1090 {
1091 struct srp_target_port *target = target_ptr;
1092 struct ib_wc wc;
1093
1094 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1095 while (ib_poll_cq(cq, 1, &wc) > 0) {
1096 if (wc.status) {
1097 shost_printk(KERN_ERR, target->scsi_host,
1098 PFX "failed receive status %d\n",
1099 wc.status);
1100 target->qp_in_error = 1;
1101 break;
1102 }
1103
1104 srp_handle_recv(target, &wc);
1105 }
1106 }
1107
1108 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1109 {
1110 struct srp_target_port *target = target_ptr;
1111 struct ib_wc wc;
1112
1113 while (ib_poll_cq(cq, 1, &wc) > 0) {
1114 if (wc.status) {
1115 shost_printk(KERN_ERR, target->scsi_host,
1116 PFX "failed send status %d\n",
1117 wc.status);
1118 target->qp_in_error = 1;
1119 break;
1120 }
1121
1122 ++target->tx_tail;
1123 }
1124 }
1125
1126 static int srp_queuecommand_lck(struct scsi_cmnd *scmnd,
1127 void (*done)(struct scsi_cmnd *))
1128 {
1129 struct srp_target_port *target = host_to_target(scmnd->device->host);
1130 struct srp_request *req;
1131 struct srp_iu *iu;
1132 struct srp_cmd *cmd;
1133 struct ib_device *dev;
1134 int len;
1135
1136 if (target->state == SRP_TARGET_CONNECTING)
1137 goto err;
1138
1139 if (target->state == SRP_TARGET_DEAD ||
1140 target->state == SRP_TARGET_REMOVED) {
1141 scmnd->result = DID_BAD_TARGET << 16;
1142 done(scmnd);
1143 return 0;
1144 }
1145
1146 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1147 if (!iu)
1148 goto err;
1149
1150 dev = target->srp_host->srp_dev->dev;
1151 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1152 DMA_TO_DEVICE);
1153
1154 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1155
1156 scmnd->scsi_done = done;
1157 scmnd->result = 0;
1158 scmnd->host_scribble = (void *) (long) req->index;
1159
1160 cmd = iu->buf;
1161 memset(cmd, 0, sizeof *cmd);
1162
1163 cmd->opcode = SRP_CMD;
1164 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1165 cmd->tag = req->index;
1166 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1167
1168 req->scmnd = scmnd;
1169 req->cmd = iu;
1170 req->cmd_done = 0;
1171 req->tsk_mgmt = NULL;
1172
1173 len = srp_map_data(scmnd, target, req);
1174 if (len < 0) {
1175 shost_printk(KERN_ERR, target->scsi_host,
1176 PFX "Failed to map data\n");
1177 goto err;
1178 }
1179
1180 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1181 DMA_TO_DEVICE);
1182
1183 if (__srp_post_send(target, iu, len)) {
1184 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1185 goto err_unmap;
1186 }
1187
1188 list_move_tail(&req->list, &target->req_queue);
1189
1190 return 0;
1191
1192 err_unmap:
1193 srp_unmap_data(scmnd, target, req);
1194
1195 err:
1196 return SCSI_MLQUEUE_HOST_BUSY;
1197 }
1198
1199 static DEF_SCSI_QCMD(srp_queuecommand)
1200
1201 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1202 {
1203 int i;
1204
1205 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1206 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1207 target->max_ti_iu_len,
1208 GFP_KERNEL, DMA_FROM_DEVICE);
1209 if (!target->rx_ring[i])
1210 goto err;
1211 }
1212
1213 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1214 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1215 srp_max_iu_len,
1216 GFP_KERNEL, DMA_TO_DEVICE);
1217 if (!target->tx_ring[i])
1218 goto err;
1219 }
1220
1221 return 0;
1222
1223 err:
1224 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1225 srp_free_iu(target->srp_host, target->rx_ring[i]);
1226 target->rx_ring[i] = NULL;
1227 }
1228
1229 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1230 srp_free_iu(target->srp_host, target->tx_ring[i]);
1231 target->tx_ring[i] = NULL;
1232 }
1233
1234 return -ENOMEM;
1235 }
1236
1237 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1238 struct ib_cm_event *event,
1239 struct srp_target_port *target)
1240 {
1241 struct Scsi_Host *shost = target->scsi_host;
1242 struct ib_class_port_info *cpi;
1243 int opcode;
1244
1245 switch (event->param.rej_rcvd.reason) {
1246 case IB_CM_REJ_PORT_CM_REDIRECT:
1247 cpi = event->param.rej_rcvd.ari;
1248 target->path.dlid = cpi->redirect_lid;
1249 target->path.pkey = cpi->redirect_pkey;
1250 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1251 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1252
1253 target->status = target->path.dlid ?
1254 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1255 break;
1256
1257 case IB_CM_REJ_PORT_REDIRECT:
1258 if (srp_target_is_topspin(target)) {
1259 /*
1260 * Topspin/Cisco SRP gateways incorrectly send
1261 * reject reason code 25 when they mean 24
1262 * (port redirect).
1263 */
1264 memcpy(target->path.dgid.raw,
1265 event->param.rej_rcvd.ari, 16);
1266
1267 shost_printk(KERN_DEBUG, shost,
1268 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1269 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1270 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1271
1272 target->status = SRP_PORT_REDIRECT;
1273 } else {
1274 shost_printk(KERN_WARNING, shost,
1275 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1276 target->status = -ECONNRESET;
1277 }
1278 break;
1279
1280 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1281 shost_printk(KERN_WARNING, shost,
1282 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1283 target->status = -ECONNRESET;
1284 break;
1285
1286 case IB_CM_REJ_CONSUMER_DEFINED:
1287 opcode = *(u8 *) event->private_data;
1288 if (opcode == SRP_LOGIN_REJ) {
1289 struct srp_login_rej *rej = event->private_data;
1290 u32 reason = be32_to_cpu(rej->reason);
1291
1292 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1293 shost_printk(KERN_WARNING, shost,
1294 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1295 else
1296 shost_printk(KERN_WARNING, shost,
1297 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1298 } else
1299 shost_printk(KERN_WARNING, shost,
1300 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1301 " opcode 0x%02x\n", opcode);
1302 target->status = -ECONNRESET;
1303 break;
1304
1305 case IB_CM_REJ_STALE_CONN:
1306 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1307 target->status = SRP_STALE_CONN;
1308 break;
1309
1310 default:
1311 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1312 event->param.rej_rcvd.reason);
1313 target->status = -ECONNRESET;
1314 }
1315 }
1316
1317 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1318 {
1319 struct srp_target_port *target = cm_id->context;
1320 struct ib_qp_attr *qp_attr = NULL;
1321 int attr_mask = 0;
1322 int comp = 0;
1323 int opcode = 0;
1324 int i;
1325
1326 switch (event->event) {
1327 case IB_CM_REQ_ERROR:
1328 shost_printk(KERN_DEBUG, target->scsi_host,
1329 PFX "Sending CM REQ failed\n");
1330 comp = 1;
1331 target->status = -ECONNRESET;
1332 break;
1333
1334 case IB_CM_REP_RECEIVED:
1335 comp = 1;
1336 opcode = *(u8 *) event->private_data;
1337
1338 if (opcode == SRP_LOGIN_RSP) {
1339 struct srp_login_rsp *rsp = event->private_data;
1340
1341 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1342 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1343
1344 /*
1345 * Reserve credits for task management so we don't
1346 * bounce requests back to the SCSI mid-layer.
1347 */
1348 target->scsi_host->can_queue
1349 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1350 target->scsi_host->can_queue);
1351 } else {
1352 shost_printk(KERN_WARNING, target->scsi_host,
1353 PFX "Unhandled RSP opcode %#x\n", opcode);
1354 target->status = -ECONNRESET;
1355 break;
1356 }
1357
1358 if (!target->rx_ring[0]) {
1359 target->status = srp_alloc_iu_bufs(target);
1360 if (target->status)
1361 break;
1362 }
1363
1364 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1365 if (!qp_attr) {
1366 target->status = -ENOMEM;
1367 break;
1368 }
1369
1370 qp_attr->qp_state = IB_QPS_RTR;
1371 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1372 if (target->status)
1373 break;
1374
1375 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1376 if (target->status)
1377 break;
1378
1379 for (i = 0; i < SRP_RQ_SIZE; i++) {
1380 target->status = srp_post_recv(target);
1381 if (target->status)
1382 break;
1383 }
1384 if (target->status)
1385 break;
1386
1387 qp_attr->qp_state = IB_QPS_RTS;
1388 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1389 if (target->status)
1390 break;
1391
1392 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1393 if (target->status)
1394 break;
1395
1396 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1397 if (target->status)
1398 break;
1399
1400 break;
1401
1402 case IB_CM_REJ_RECEIVED:
1403 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1404 comp = 1;
1405
1406 srp_cm_rej_handler(cm_id, event, target);
1407 break;
1408
1409 case IB_CM_DREQ_RECEIVED:
1410 shost_printk(KERN_WARNING, target->scsi_host,
1411 PFX "DREQ received - connection closed\n");
1412 if (ib_send_cm_drep(cm_id, NULL, 0))
1413 shost_printk(KERN_ERR, target->scsi_host,
1414 PFX "Sending CM DREP failed\n");
1415 break;
1416
1417 case IB_CM_TIMEWAIT_EXIT:
1418 shost_printk(KERN_ERR, target->scsi_host,
1419 PFX "connection closed\n");
1420
1421 comp = 1;
1422 target->status = 0;
1423 break;
1424
1425 case IB_CM_MRA_RECEIVED:
1426 case IB_CM_DREQ_ERROR:
1427 case IB_CM_DREP_RECEIVED:
1428 break;
1429
1430 default:
1431 shost_printk(KERN_WARNING, target->scsi_host,
1432 PFX "Unhandled CM event %d\n", event->event);
1433 break;
1434 }
1435
1436 if (comp)
1437 complete(&target->done);
1438
1439 kfree(qp_attr);
1440
1441 return 0;
1442 }
1443
1444 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1445 struct srp_request *req, u8 func)
1446 {
1447 struct ib_device *dev = target->srp_host->srp_dev->dev;
1448 struct srp_iu *iu;
1449 struct srp_tsk_mgmt *tsk_mgmt;
1450
1451 spin_lock_irq(target->scsi_host->host_lock);
1452
1453 if (target->state == SRP_TARGET_DEAD ||
1454 target->state == SRP_TARGET_REMOVED) {
1455 req->scmnd->result = DID_BAD_TARGET << 16;
1456 goto out;
1457 }
1458
1459 init_completion(&req->done);
1460
1461 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1462 if (!iu)
1463 goto out;
1464
1465 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1466 DMA_TO_DEVICE);
1467 tsk_mgmt = iu->buf;
1468 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1469
1470 tsk_mgmt->opcode = SRP_TSK_MGMT;
1471 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1472 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1473 tsk_mgmt->tsk_mgmt_func = func;
1474 tsk_mgmt->task_tag = req->index;
1475
1476 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1477 DMA_TO_DEVICE);
1478 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1479 goto out;
1480
1481 req->tsk_mgmt = iu;
1482
1483 spin_unlock_irq(target->scsi_host->host_lock);
1484
1485 if (!wait_for_completion_timeout(&req->done,
1486 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1487 return -1;
1488
1489 return 0;
1490
1491 out:
1492 spin_unlock_irq(target->scsi_host->host_lock);
1493 return -1;
1494 }
1495
1496 static int srp_find_req(struct srp_target_port *target,
1497 struct scsi_cmnd *scmnd,
1498 struct srp_request **req)
1499 {
1500 if (scmnd->host_scribble == (void *) -1L)
1501 return -1;
1502
1503 *req = &target->req_ring[(long) scmnd->host_scribble];
1504
1505 return 0;
1506 }
1507
1508 static int srp_abort(struct scsi_cmnd *scmnd)
1509 {
1510 struct srp_target_port *target = host_to_target(scmnd->device->host);
1511 struct srp_request *req;
1512 int ret = SUCCESS;
1513
1514 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1515
1516 if (target->qp_in_error)
1517 return FAILED;
1518 if (srp_find_req(target, scmnd, &req))
1519 return FAILED;
1520 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1521 return FAILED;
1522
1523 spin_lock_irq(target->scsi_host->host_lock);
1524
1525 if (req->cmd_done) {
1526 srp_remove_req(target, req);
1527 scmnd->scsi_done(scmnd);
1528 } else if (!req->tsk_status) {
1529 srp_remove_req(target, req);
1530 scmnd->result = DID_ABORT << 16;
1531 } else
1532 ret = FAILED;
1533
1534 spin_unlock_irq(target->scsi_host->host_lock);
1535
1536 return ret;
1537 }
1538
1539 static int srp_reset_device(struct scsi_cmnd *scmnd)
1540 {
1541 struct srp_target_port *target = host_to_target(scmnd->device->host);
1542 struct srp_request *req, *tmp;
1543
1544 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1545
1546 if (target->qp_in_error)
1547 return FAILED;
1548 if (srp_find_req(target, scmnd, &req))
1549 return FAILED;
1550 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1551 return FAILED;
1552 if (req->tsk_status)
1553 return FAILED;
1554
1555 spin_lock_irq(target->scsi_host->host_lock);
1556
1557 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1558 if (req->scmnd->device == scmnd->device)
1559 srp_reset_req(target, req);
1560
1561 spin_unlock_irq(target->scsi_host->host_lock);
1562
1563 return SUCCESS;
1564 }
1565
1566 static int srp_reset_host(struct scsi_cmnd *scmnd)
1567 {
1568 struct srp_target_port *target = host_to_target(scmnd->device->host);
1569 int ret = FAILED;
1570
1571 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1572
1573 if (!srp_reconnect_target(target))
1574 ret = SUCCESS;
1575
1576 return ret;
1577 }
1578
1579 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1580 char *buf)
1581 {
1582 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1583
1584 if (target->state == SRP_TARGET_DEAD ||
1585 target->state == SRP_TARGET_REMOVED)
1586 return -ENODEV;
1587
1588 return sprintf(buf, "0x%016llx\n",
1589 (unsigned long long) be64_to_cpu(target->id_ext));
1590 }
1591
1592 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1593 char *buf)
1594 {
1595 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1596
1597 if (target->state == SRP_TARGET_DEAD ||
1598 target->state == SRP_TARGET_REMOVED)
1599 return -ENODEV;
1600
1601 return sprintf(buf, "0x%016llx\n",
1602 (unsigned long long) be64_to_cpu(target->ioc_guid));
1603 }
1604
1605 static ssize_t show_service_id(struct device *dev,
1606 struct device_attribute *attr, char *buf)
1607 {
1608 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1609
1610 if (target->state == SRP_TARGET_DEAD ||
1611 target->state == SRP_TARGET_REMOVED)
1612 return -ENODEV;
1613
1614 return sprintf(buf, "0x%016llx\n",
1615 (unsigned long long) be64_to_cpu(target->service_id));
1616 }
1617
1618 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1619 char *buf)
1620 {
1621 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1622
1623 if (target->state == SRP_TARGET_DEAD ||
1624 target->state == SRP_TARGET_REMOVED)
1625 return -ENODEV;
1626
1627 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1628 }
1629
1630 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1631 char *buf)
1632 {
1633 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1634
1635 if (target->state == SRP_TARGET_DEAD ||
1636 target->state == SRP_TARGET_REMOVED)
1637 return -ENODEV;
1638
1639 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1640 }
1641
1642 static ssize_t show_orig_dgid(struct device *dev,
1643 struct device_attribute *attr, char *buf)
1644 {
1645 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1646
1647 if (target->state == SRP_TARGET_DEAD ||
1648 target->state == SRP_TARGET_REMOVED)
1649 return -ENODEV;
1650
1651 return sprintf(buf, "%pI6\n", target->orig_dgid);
1652 }
1653
1654 static ssize_t show_req_lim(struct device *dev,
1655 struct device_attribute *attr, char *buf)
1656 {
1657 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1658
1659 if (target->state == SRP_TARGET_DEAD ||
1660 target->state == SRP_TARGET_REMOVED)
1661 return -ENODEV;
1662
1663 return sprintf(buf, "%d\n", target->req_lim);
1664 }
1665
1666 static ssize_t show_zero_req_lim(struct device *dev,
1667 struct device_attribute *attr, char *buf)
1668 {
1669 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1670
1671 if (target->state == SRP_TARGET_DEAD ||
1672 target->state == SRP_TARGET_REMOVED)
1673 return -ENODEV;
1674
1675 return sprintf(buf, "%d\n", target->zero_req_lim);
1676 }
1677
1678 static ssize_t show_local_ib_port(struct device *dev,
1679 struct device_attribute *attr, char *buf)
1680 {
1681 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1682
1683 return sprintf(buf, "%d\n", target->srp_host->port);
1684 }
1685
1686 static ssize_t show_local_ib_device(struct device *dev,
1687 struct device_attribute *attr, char *buf)
1688 {
1689 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1690
1691 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1692 }
1693
1694 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1695 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1696 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1697 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1698 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1699 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1700 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
1701 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1702 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1703 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1704
1705 static struct device_attribute *srp_host_attrs[] = {
1706 &dev_attr_id_ext,
1707 &dev_attr_ioc_guid,
1708 &dev_attr_service_id,
1709 &dev_attr_pkey,
1710 &dev_attr_dgid,
1711 &dev_attr_orig_dgid,
1712 &dev_attr_req_lim,
1713 &dev_attr_zero_req_lim,
1714 &dev_attr_local_ib_port,
1715 &dev_attr_local_ib_device,
1716 NULL
1717 };
1718
1719 static struct scsi_host_template srp_template = {
1720 .module = THIS_MODULE,
1721 .name = "InfiniBand SRP initiator",
1722 .proc_name = DRV_NAME,
1723 .info = srp_target_info,
1724 .queuecommand = srp_queuecommand,
1725 .eh_abort_handler = srp_abort,
1726 .eh_device_reset_handler = srp_reset_device,
1727 .eh_host_reset_handler = srp_reset_host,
1728 .can_queue = SRP_CMD_SQ_SIZE,
1729 .this_id = -1,
1730 .cmd_per_lun = SRP_CMD_SQ_SIZE,
1731 .use_clustering = ENABLE_CLUSTERING,
1732 .shost_attrs = srp_host_attrs
1733 };
1734
1735 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1736 {
1737 struct srp_rport_identifiers ids;
1738 struct srp_rport *rport;
1739
1740 sprintf(target->target_name, "SRP.T10:%016llX",
1741 (unsigned long long) be64_to_cpu(target->id_ext));
1742
1743 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1744 return -ENODEV;
1745
1746 memcpy(ids.port_id, &target->id_ext, 8);
1747 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1748 ids.roles = SRP_RPORT_ROLE_TARGET;
1749 rport = srp_rport_add(target->scsi_host, &ids);
1750 if (IS_ERR(rport)) {
1751 scsi_remove_host(target->scsi_host);
1752 return PTR_ERR(rport);
1753 }
1754
1755 spin_lock(&host->target_lock);
1756 list_add_tail(&target->list, &host->target_list);
1757 spin_unlock(&host->target_lock);
1758
1759 target->state = SRP_TARGET_LIVE;
1760
1761 scsi_scan_target(&target->scsi_host->shost_gendev,
1762 0, target->scsi_id, SCAN_WILD_CARD, 0);
1763
1764 return 0;
1765 }
1766
1767 static void srp_release_dev(struct device *dev)
1768 {
1769 struct srp_host *host =
1770 container_of(dev, struct srp_host, dev);
1771
1772 complete(&host->released);
1773 }
1774
1775 static struct class srp_class = {
1776 .name = "infiniband_srp",
1777 .dev_release = srp_release_dev
1778 };
1779
1780 /*
1781 * Target ports are added by writing
1782 *
1783 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1784 * pkey=<P_Key>,service_id=<service ID>
1785 *
1786 * to the add_target sysfs attribute.
1787 */
1788 enum {
1789 SRP_OPT_ERR = 0,
1790 SRP_OPT_ID_EXT = 1 << 0,
1791 SRP_OPT_IOC_GUID = 1 << 1,
1792 SRP_OPT_DGID = 1 << 2,
1793 SRP_OPT_PKEY = 1 << 3,
1794 SRP_OPT_SERVICE_ID = 1 << 4,
1795 SRP_OPT_MAX_SECT = 1 << 5,
1796 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1797 SRP_OPT_IO_CLASS = 1 << 7,
1798 SRP_OPT_INITIATOR_EXT = 1 << 8,
1799 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1800 SRP_OPT_IOC_GUID |
1801 SRP_OPT_DGID |
1802 SRP_OPT_PKEY |
1803 SRP_OPT_SERVICE_ID),
1804 };
1805
1806 static const match_table_t srp_opt_tokens = {
1807 { SRP_OPT_ID_EXT, "id_ext=%s" },
1808 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1809 { SRP_OPT_DGID, "dgid=%s" },
1810 { SRP_OPT_PKEY, "pkey=%x" },
1811 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1812 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1813 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1814 { SRP_OPT_IO_CLASS, "io_class=%x" },
1815 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1816 { SRP_OPT_ERR, NULL }
1817 };
1818
1819 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1820 {
1821 char *options, *sep_opt;
1822 char *p;
1823 char dgid[3];
1824 substring_t args[MAX_OPT_ARGS];
1825 int opt_mask = 0;
1826 int token;
1827 int ret = -EINVAL;
1828 int i;
1829
1830 options = kstrdup(buf, GFP_KERNEL);
1831 if (!options)
1832 return -ENOMEM;
1833
1834 sep_opt = options;
1835 while ((p = strsep(&sep_opt, ",")) != NULL) {
1836 if (!*p)
1837 continue;
1838
1839 token = match_token(p, srp_opt_tokens, args);
1840 opt_mask |= token;
1841
1842 switch (token) {
1843 case SRP_OPT_ID_EXT:
1844 p = match_strdup(args);
1845 if (!p) {
1846 ret = -ENOMEM;
1847 goto out;
1848 }
1849 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1850 kfree(p);
1851 break;
1852
1853 case SRP_OPT_IOC_GUID:
1854 p = match_strdup(args);
1855 if (!p) {
1856 ret = -ENOMEM;
1857 goto out;
1858 }
1859 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1860 kfree(p);
1861 break;
1862
1863 case SRP_OPT_DGID:
1864 p = match_strdup(args);
1865 if (!p) {
1866 ret = -ENOMEM;
1867 goto out;
1868 }
1869 if (strlen(p) != 32) {
1870 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1871 kfree(p);
1872 goto out;
1873 }
1874
1875 for (i = 0; i < 16; ++i) {
1876 strlcpy(dgid, p + i * 2, 3);
1877 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1878 }
1879 kfree(p);
1880 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1881 break;
1882
1883 case SRP_OPT_PKEY:
1884 if (match_hex(args, &token)) {
1885 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1886 goto out;
1887 }
1888 target->path.pkey = cpu_to_be16(token);
1889 break;
1890
1891 case SRP_OPT_SERVICE_ID:
1892 p = match_strdup(args);
1893 if (!p) {
1894 ret = -ENOMEM;
1895 goto out;
1896 }
1897 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1898 target->path.service_id = target->service_id;
1899 kfree(p);
1900 break;
1901
1902 case SRP_OPT_MAX_SECT:
1903 if (match_int(args, &token)) {
1904 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1905 goto out;
1906 }
1907 target->scsi_host->max_sectors = token;
1908 break;
1909
1910 case SRP_OPT_MAX_CMD_PER_LUN:
1911 if (match_int(args, &token)) {
1912 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1913 goto out;
1914 }
1915 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
1916 break;
1917
1918 case SRP_OPT_IO_CLASS:
1919 if (match_hex(args, &token)) {
1920 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1921 goto out;
1922 }
1923 if (token != SRP_REV10_IB_IO_CLASS &&
1924 token != SRP_REV16A_IB_IO_CLASS) {
1925 printk(KERN_WARNING PFX "unknown IO class parameter value"
1926 " %x specified (use %x or %x).\n",
1927 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1928 goto out;
1929 }
1930 target->io_class = token;
1931 break;
1932
1933 case SRP_OPT_INITIATOR_EXT:
1934 p = match_strdup(args);
1935 if (!p) {
1936 ret = -ENOMEM;
1937 goto out;
1938 }
1939 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1940 kfree(p);
1941 break;
1942
1943 default:
1944 printk(KERN_WARNING PFX "unknown parameter or missing value "
1945 "'%s' in target creation request\n", p);
1946 goto out;
1947 }
1948 }
1949
1950 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1951 ret = 0;
1952 else
1953 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1954 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1955 !(srp_opt_tokens[i].token & opt_mask))
1956 printk(KERN_WARNING PFX "target creation request is "
1957 "missing parameter '%s'\n",
1958 srp_opt_tokens[i].pattern);
1959
1960 out:
1961 kfree(options);
1962 return ret;
1963 }
1964
1965 static ssize_t srp_create_target(struct device *dev,
1966 struct device_attribute *attr,
1967 const char *buf, size_t count)
1968 {
1969 struct srp_host *host =
1970 container_of(dev, struct srp_host, dev);
1971 struct Scsi_Host *target_host;
1972 struct srp_target_port *target;
1973 int ret;
1974 int i;
1975
1976 target_host = scsi_host_alloc(&srp_template,
1977 sizeof (struct srp_target_port));
1978 if (!target_host)
1979 return -ENOMEM;
1980
1981 target_host->transportt = ib_srp_transport_template;
1982 target_host->max_lun = SRP_MAX_LUN;
1983 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1984
1985 target = host_to_target(target_host);
1986
1987 target->io_class = SRP_REV16A_IB_IO_CLASS;
1988 target->scsi_host = target_host;
1989 target->srp_host = host;
1990
1991 INIT_LIST_HEAD(&target->free_reqs);
1992 INIT_LIST_HEAD(&target->req_queue);
1993 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1994 target->req_ring[i].index = i;
1995 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1996 }
1997
1998 ret = srp_parse_options(buf, target);
1999 if (ret)
2000 goto err;
2001
2002 ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
2003
2004 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2005 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
2006 "service_id %016llx dgid %pI6\n",
2007 (unsigned long long) be64_to_cpu(target->id_ext),
2008 (unsigned long long) be64_to_cpu(target->ioc_guid),
2009 be16_to_cpu(target->path.pkey),
2010 (unsigned long long) be64_to_cpu(target->service_id),
2011 target->path.dgid.raw);
2012
2013 ret = srp_create_target_ib(target);
2014 if (ret)
2015 goto err;
2016
2017 ret = srp_new_cm_id(target);
2018 if (ret)
2019 goto err_free;
2020
2021 target->qp_in_error = 0;
2022 ret = srp_connect_target(target);
2023 if (ret) {
2024 shost_printk(KERN_ERR, target->scsi_host,
2025 PFX "Connection failed\n");
2026 goto err_cm_id;
2027 }
2028
2029 ret = srp_add_target(host, target);
2030 if (ret)
2031 goto err_disconnect;
2032
2033 return count;
2034
2035 err_disconnect:
2036 srp_disconnect_target(target);
2037
2038 err_cm_id:
2039 ib_destroy_cm_id(target->cm_id);
2040
2041 err_free:
2042 srp_free_target_ib(target);
2043
2044 err:
2045 scsi_host_put(target_host);
2046
2047 return ret;
2048 }
2049
2050 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2051
2052 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2053 char *buf)
2054 {
2055 struct srp_host *host = container_of(dev, struct srp_host, dev);
2056
2057 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2058 }
2059
2060 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2061
2062 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2063 char *buf)
2064 {
2065 struct srp_host *host = container_of(dev, struct srp_host, dev);
2066
2067 return sprintf(buf, "%d\n", host->port);
2068 }
2069
2070 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2071
2072 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2073 {
2074 struct srp_host *host;
2075
2076 host = kzalloc(sizeof *host, GFP_KERNEL);
2077 if (!host)
2078 return NULL;
2079
2080 INIT_LIST_HEAD(&host->target_list);
2081 spin_lock_init(&host->target_lock);
2082 init_completion(&host->released);
2083 host->srp_dev = device;
2084 host->port = port;
2085
2086 host->dev.class = &srp_class;
2087 host->dev.parent = device->dev->dma_device;
2088 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2089
2090 if (device_register(&host->dev))
2091 goto free_host;
2092 if (device_create_file(&host->dev, &dev_attr_add_target))
2093 goto err_class;
2094 if (device_create_file(&host->dev, &dev_attr_ibdev))
2095 goto err_class;
2096 if (device_create_file(&host->dev, &dev_attr_port))
2097 goto err_class;
2098
2099 return host;
2100
2101 err_class:
2102 device_unregister(&host->dev);
2103
2104 free_host:
2105 kfree(host);
2106
2107 return NULL;
2108 }
2109
2110 static void srp_add_one(struct ib_device *device)
2111 {
2112 struct srp_device *srp_dev;
2113 struct ib_device_attr *dev_attr;
2114 struct ib_fmr_pool_param fmr_param;
2115 struct srp_host *host;
2116 int s, e, p;
2117
2118 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2119 if (!dev_attr)
2120 return;
2121
2122 if (ib_query_device(device, dev_attr)) {
2123 printk(KERN_WARNING PFX "Query device failed for %s\n",
2124 device->name);
2125 goto free_attr;
2126 }
2127
2128 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2129 if (!srp_dev)
2130 goto free_attr;
2131
2132 /*
2133 * Use the smallest page size supported by the HCA, down to a
2134 * minimum of 512 bytes (which is the smallest sector that a
2135 * SCSI command will ever carry).
2136 */
2137 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2138 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
2139 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2140
2141 INIT_LIST_HEAD(&srp_dev->dev_list);
2142
2143 srp_dev->dev = device;
2144 srp_dev->pd = ib_alloc_pd(device);
2145 if (IS_ERR(srp_dev->pd))
2146 goto free_dev;
2147
2148 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2149 IB_ACCESS_LOCAL_WRITE |
2150 IB_ACCESS_REMOTE_READ |
2151 IB_ACCESS_REMOTE_WRITE);
2152 if (IS_ERR(srp_dev->mr))
2153 goto err_pd;
2154
2155 memset(&fmr_param, 0, sizeof fmr_param);
2156 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2157 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2158 fmr_param.cache = 1;
2159 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2160 fmr_param.page_shift = srp_dev->fmr_page_shift;
2161 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2162 IB_ACCESS_REMOTE_WRITE |
2163 IB_ACCESS_REMOTE_READ);
2164
2165 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2166 if (IS_ERR(srp_dev->fmr_pool))
2167 srp_dev->fmr_pool = NULL;
2168
2169 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2170 s = 0;
2171 e = 0;
2172 } else {
2173 s = 1;
2174 e = device->phys_port_cnt;
2175 }
2176
2177 for (p = s; p <= e; ++p) {
2178 host = srp_add_port(srp_dev, p);
2179 if (host)
2180 list_add_tail(&host->list, &srp_dev->dev_list);
2181 }
2182
2183 ib_set_client_data(device, &srp_client, srp_dev);
2184
2185 goto free_attr;
2186
2187 err_pd:
2188 ib_dealloc_pd(srp_dev->pd);
2189
2190 free_dev:
2191 kfree(srp_dev);
2192
2193 free_attr:
2194 kfree(dev_attr);
2195 }
2196
2197 static void srp_remove_one(struct ib_device *device)
2198 {
2199 struct srp_device *srp_dev;
2200 struct srp_host *host, *tmp_host;
2201 LIST_HEAD(target_list);
2202 struct srp_target_port *target, *tmp_target;
2203
2204 srp_dev = ib_get_client_data(device, &srp_client);
2205
2206 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2207 device_unregister(&host->dev);
2208 /*
2209 * Wait for the sysfs entry to go away, so that no new
2210 * target ports can be created.
2211 */
2212 wait_for_completion(&host->released);
2213
2214 /*
2215 * Mark all target ports as removed, so we stop queueing
2216 * commands and don't try to reconnect.
2217 */
2218 spin_lock(&host->target_lock);
2219 list_for_each_entry(target, &host->target_list, list) {
2220 spin_lock_irq(target->scsi_host->host_lock);
2221 target->state = SRP_TARGET_REMOVED;
2222 spin_unlock_irq(target->scsi_host->host_lock);
2223 }
2224 spin_unlock(&host->target_lock);
2225
2226 /*
2227 * Wait for any reconnection tasks that may have
2228 * started before we marked our target ports as
2229 * removed, and any target port removal tasks.
2230 */
2231 flush_scheduled_work();
2232
2233 list_for_each_entry_safe(target, tmp_target,
2234 &host->target_list, list) {
2235 srp_remove_host(target->scsi_host);
2236 scsi_remove_host(target->scsi_host);
2237 srp_disconnect_target(target);
2238 ib_destroy_cm_id(target->cm_id);
2239 srp_free_target_ib(target);
2240 scsi_host_put(target->scsi_host);
2241 }
2242
2243 kfree(host);
2244 }
2245
2246 if (srp_dev->fmr_pool)
2247 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2248 ib_dereg_mr(srp_dev->mr);
2249 ib_dealloc_pd(srp_dev->pd);
2250
2251 kfree(srp_dev);
2252 }
2253
2254 static struct srp_function_template ib_srp_transport_functions = {
2255 };
2256
2257 static int __init srp_init_module(void)
2258 {
2259 int ret;
2260
2261 BUILD_BUG_ON_NOT_POWER_OF_2(SRP_SQ_SIZE);
2262 BUILD_BUG_ON_NOT_POWER_OF_2(SRP_RQ_SIZE);
2263
2264 if (srp_sg_tablesize > 255) {
2265 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2266 srp_sg_tablesize = 255;
2267 }
2268
2269 ib_srp_transport_template =
2270 srp_attach_transport(&ib_srp_transport_functions);
2271 if (!ib_srp_transport_template)
2272 return -ENOMEM;
2273
2274 srp_template.sg_tablesize = srp_sg_tablesize;
2275 srp_max_iu_len = (sizeof (struct srp_cmd) +
2276 sizeof (struct srp_indirect_buf) +
2277 srp_sg_tablesize * 16);
2278
2279 ret = class_register(&srp_class);
2280 if (ret) {
2281 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2282 srp_release_transport(ib_srp_transport_template);
2283 return ret;
2284 }
2285
2286 ib_sa_register_client(&srp_sa_client);
2287
2288 ret = ib_register_client(&srp_client);
2289 if (ret) {
2290 printk(KERN_ERR PFX "couldn't register IB client\n");
2291 srp_release_transport(ib_srp_transport_template);
2292 ib_sa_unregister_client(&srp_sa_client);
2293 class_unregister(&srp_class);
2294 return ret;
2295 }
2296
2297 return 0;
2298 }
2299
2300 static void __exit srp_cleanup_module(void)
2301 {
2302 ib_unregister_client(&srp_client);
2303 ib_sa_unregister_client(&srp_sa_client);
2304 class_unregister(&srp_class);
2305 srp_release_transport(ib_srp_transport_template);
2306 }
2307
2308 module_init(srp_init_module);
2309 module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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