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IB/srp: Test only once whether iu allocation succeeded
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / infiniband / ulp / srp / ib_srp.c
blobb28c2b9db26b022ea84fd5f59c1463b8efd0355f
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 bool srp_change_state(struct srp_target_port *target,
445 enum srp_target_state old,
446 enum srp_target_state new)
447 {
448 bool changed = false;
449
450 spin_lock_irq(&target->lock);
451 if (target->state == old) {
452 target->state = new;
453 changed = true;
454 }
455 spin_unlock_irq(&target->lock);
456 return changed;
457 }
458
459 static void srp_remove_work(struct work_struct *work)
460 {
461 struct srp_target_port *target =
462 container_of(work, struct srp_target_port, work);
463
464 if (!srp_change_state(target, SRP_TARGET_DEAD, SRP_TARGET_REMOVED))
465 return;
466
467 spin_lock(&target->srp_host->target_lock);
468 list_del(&target->list);
469 spin_unlock(&target->srp_host->target_lock);
470
471 srp_remove_host(target->scsi_host);
472 scsi_remove_host(target->scsi_host);
473 ib_destroy_cm_id(target->cm_id);
474 srp_free_target_ib(target);
475 scsi_host_put(target->scsi_host);
476 }
477
478 static int srp_connect_target(struct srp_target_port *target)
479 {
480 int retries = 3;
481 int ret;
482
483 ret = srp_lookup_path(target);
484 if (ret)
485 return ret;
486
487 while (1) {
488 init_completion(&target->done);
489 ret = srp_send_req(target);
490 if (ret)
491 return ret;
492 wait_for_completion(&target->done);
493
494 /*
495 * The CM event handling code will set status to
496 * SRP_PORT_REDIRECT if we get a port redirect REJ
497 * back, or SRP_DLID_REDIRECT if we get a lid/qp
498 * redirect REJ back.
499 */
500 switch (target->status) {
501 case 0:
502 return 0;
503
504 case SRP_PORT_REDIRECT:
505 ret = srp_lookup_path(target);
506 if (ret)
507 return ret;
508 break;
509
510 case SRP_DLID_REDIRECT:
511 break;
512
513 case SRP_STALE_CONN:
514 /* Our current CM id was stale, and is now in timewait.
515 * Try to reconnect with a new one.
516 */
517 if (!retries-- || srp_new_cm_id(target)) {
518 shost_printk(KERN_ERR, target->scsi_host, PFX
519 "giving up on stale connection\n");
520 target->status = -ECONNRESET;
521 return target->status;
522 }
523
524 shost_printk(KERN_ERR, target->scsi_host, PFX
525 "retrying stale connection\n");
526 break;
527
528 default:
529 return target->status;
530 }
531 }
532 }
533
534 static void srp_unmap_data(struct scsi_cmnd *scmnd,
535 struct srp_target_port *target,
536 struct srp_request *req)
537 {
538 if (!scsi_sglist(scmnd) ||
539 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
540 scmnd->sc_data_direction != DMA_FROM_DEVICE))
541 return;
542
543 if (req->fmr) {
544 ib_fmr_pool_unmap(req->fmr);
545 req->fmr = NULL;
546 }
547
548 ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
549 scsi_sg_count(scmnd), scmnd->sc_data_direction);
550 }
551
552 static void srp_remove_req(struct srp_target_port *target,
553 struct srp_request *req, s32 req_lim_delta)
554 {
555 unsigned long flags;
556
557 srp_unmap_data(req->scmnd, target, req);
558 spin_lock_irqsave(&target->lock, flags);
559 target->req_lim += req_lim_delta;
560 req->scmnd = NULL;
561 list_add_tail(&req->list, &target->free_reqs);
562 spin_unlock_irqrestore(&target->lock, flags);
563 }
564
565 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
566 {
567 req->scmnd->result = DID_RESET << 16;
568 req->scmnd->scsi_done(req->scmnd);
569 srp_remove_req(target, req, 0);
570 }
571
572 static int srp_reconnect_target(struct srp_target_port *target)
573 {
574 struct ib_qp_attr qp_attr;
575 struct ib_wc wc;
576 int i, ret;
577
578 if (!srp_change_state(target, SRP_TARGET_LIVE, SRP_TARGET_CONNECTING))
579 return -EAGAIN;
580
581 srp_disconnect_target(target);
582 /*
583 * Now get a new local CM ID so that we avoid confusing the
584 * target in case things are really fouled up.
585 */
586 ret = srp_new_cm_id(target);
587 if (ret)
588 goto err;
589
590 qp_attr.qp_state = IB_QPS_RESET;
591 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
592 if (ret)
593 goto err;
594
595 ret = srp_init_qp(target, target->qp);
596 if (ret)
597 goto err;
598
599 while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
600 ; /* nothing */
601 while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
602 ; /* nothing */
603
604 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
605 struct srp_request *req = &target->req_ring[i];
606 if (req->scmnd)
607 srp_reset_req(target, req);
608 }
609
610 INIT_LIST_HEAD(&target->free_tx);
611 for (i = 0; i < SRP_SQ_SIZE; ++i)
612 list_add(&target->tx_ring[i]->list, &target->free_tx);
613
614 target->qp_in_error = 0;
615 ret = srp_connect_target(target);
616 if (ret)
617 goto err;
618
619 if (!srp_change_state(target, SRP_TARGET_CONNECTING, SRP_TARGET_LIVE))
620 ret = -EAGAIN;
621
622 return ret;
623
624 err:
625 shost_printk(KERN_ERR, target->scsi_host,
626 PFX "reconnect failed (%d), removing target port.\n", ret);
627
628 /*
629 * We couldn't reconnect, so kill our target port off.
630 * However, we have to defer the real removal because we
631 * are in the context of the SCSI error handler now, which
632 * will deadlock if we call scsi_remove_host().
633 *
634 * Schedule our work inside the lock to avoid a race with
635 * the flush_scheduled_work() in srp_remove_one().
636 */
637 spin_lock_irq(&target->lock);
638 if (target->state == SRP_TARGET_CONNECTING) {
639 target->state = SRP_TARGET_DEAD;
640 INIT_WORK(&target->work, srp_remove_work);
641 schedule_work(&target->work);
642 }
643 spin_unlock_irq(&target->lock);
644
645 return ret;
646 }
647
648 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
649 int sg_cnt, struct srp_request *req,
650 struct srp_direct_buf *buf)
651 {
652 u64 io_addr = 0;
653 u64 *dma_pages;
654 u32 len;
655 int page_cnt;
656 int i, j;
657 int ret;
658 struct srp_device *dev = target->srp_host->srp_dev;
659 struct ib_device *ibdev = dev->dev;
660 struct scatterlist *sg;
661
662 if (!dev->fmr_pool)
663 return -ENODEV;
664
665 if (srp_target_is_mellanox(target) &&
666 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
667 return -EINVAL;
668
669 len = page_cnt = 0;
670 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
671 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
672
673 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
674 if (i > 0)
675 return -EINVAL;
676 else
677 ++page_cnt;
678 }
679 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
680 ~dev->fmr_page_mask) {
681 if (i < sg_cnt - 1)
682 return -EINVAL;
683 else
684 ++page_cnt;
685 }
686
687 len += dma_len;
688 }
689
690 page_cnt += len >> dev->fmr_page_shift;
691 if (page_cnt > SRP_FMR_SIZE)
692 return -ENOMEM;
693
694 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
695 if (!dma_pages)
696 return -ENOMEM;
697
698 page_cnt = 0;
699 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
700 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
701
702 for (j = 0; j < dma_len; j += dev->fmr_page_size)
703 dma_pages[page_cnt++] =
704 (ib_sg_dma_address(ibdev, sg) &
705 dev->fmr_page_mask) + j;
706 }
707
708 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
709 dma_pages, page_cnt, io_addr);
710 if (IS_ERR(req->fmr)) {
711 ret = PTR_ERR(req->fmr);
712 req->fmr = NULL;
713 goto out;
714 }
715
716 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
717 ~dev->fmr_page_mask);
718 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
719 buf->len = cpu_to_be32(len);
720
721 ret = 0;
722
723 out:
724 kfree(dma_pages);
725
726 return ret;
727 }
728
729 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
730 struct srp_request *req)
731 {
732 struct scatterlist *scat;
733 struct srp_cmd *cmd = req->cmd->buf;
734 int len, nents, count;
735 u8 fmt = SRP_DATA_DESC_DIRECT;
736 struct srp_device *dev;
737 struct ib_device *ibdev;
738
739 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
740 return sizeof (struct srp_cmd);
741
742 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
743 scmnd->sc_data_direction != DMA_TO_DEVICE) {
744 shost_printk(KERN_WARNING, target->scsi_host,
745 PFX "Unhandled data direction %d\n",
746 scmnd->sc_data_direction);
747 return -EINVAL;
748 }
749
750 nents = scsi_sg_count(scmnd);
751 scat = scsi_sglist(scmnd);
752
753 dev = target->srp_host->srp_dev;
754 ibdev = dev->dev;
755
756 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
757
758 fmt = SRP_DATA_DESC_DIRECT;
759 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
760
761 if (count == 1) {
762 /*
763 * The midlayer only generated a single gather/scatter
764 * entry, or DMA mapping coalesced everything to a
765 * single entry. So a direct descriptor along with
766 * the DMA MR suffices.
767 */
768 struct srp_direct_buf *buf = (void *) cmd->add_data;
769
770 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
771 buf->key = cpu_to_be32(target->rkey);
772 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
773 } else if (srp_map_fmr(target, scat, count, req,
774 (void *) cmd->add_data)) {
775 /*
776 * FMR mapping failed, and the scatterlist has more
777 * than one entry. Generate an indirect memory
778 * descriptor.
779 */
780 struct srp_indirect_buf *buf = (void *) cmd->add_data;
781 struct scatterlist *sg;
782 u32 datalen = 0;
783 int i;
784
785 fmt = SRP_DATA_DESC_INDIRECT;
786 len = sizeof (struct srp_cmd) +
787 sizeof (struct srp_indirect_buf) +
788 count * sizeof (struct srp_direct_buf);
789
790 scsi_for_each_sg(scmnd, sg, count, i) {
791 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
792
793 buf->desc_list[i].va =
794 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
795 buf->desc_list[i].key =
796 cpu_to_be32(target->rkey);
797 buf->desc_list[i].len = cpu_to_be32(dma_len);
798 datalen += dma_len;
799 }
800
801 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
802 cmd->data_out_desc_cnt = count;
803 else
804 cmd->data_in_desc_cnt = count;
805
806 buf->table_desc.va =
807 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
808 buf->table_desc.key =
809 cpu_to_be32(target->rkey);
810 buf->table_desc.len =
811 cpu_to_be32(count * sizeof (struct srp_direct_buf));
812
813 buf->len = cpu_to_be32(datalen);
814 }
815
816 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
817 cmd->buf_fmt = fmt << 4;
818 else
819 cmd->buf_fmt = fmt;
820
821 return len;
822 }
823
824 /*
825 * Return an IU and possible credit to the free pool
826 */
827 static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
828 enum srp_iu_type iu_type)
829 {
830 unsigned long flags;
831
832 spin_lock_irqsave(&target->lock, flags);
833 list_add(&iu->list, &target->free_tx);
834 if (iu_type != SRP_IU_RSP)
835 ++target->req_lim;
836 spin_unlock_irqrestore(&target->lock, flags);
837 }
838
839 /*
840 * Must be called with target->lock held to protect req_lim and free_tx.
841 * If IU is not sent, it must be returned using srp_put_tx_iu().
842 *
843 * Note:
844 * An upper limit for the number of allocated information units for each
845 * request type is:
846 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
847 * more than Scsi_Host.can_queue requests.
848 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
849 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
850 * one unanswered SRP request to an initiator.
851 */
852 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
853 enum srp_iu_type iu_type)
854 {
855 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
856 struct srp_iu *iu;
857
858 srp_send_completion(target->send_cq, target);
859
860 if (list_empty(&target->free_tx))
861 return NULL;
862
863 /* Initiator responses to target requests do not consume credits */
864 if (iu_type != SRP_IU_RSP) {
865 if (target->req_lim <= rsv) {
866 ++target->zero_req_lim;
867 return NULL;
868 }
869
870 --target->req_lim;
871 }
872
873 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
874 list_del(&iu->list);
875 return iu;
876 }
877
878 static int srp_post_send(struct srp_target_port *target,
879 struct srp_iu *iu, int len)
880 {
881 struct ib_sge list;
882 struct ib_send_wr wr, *bad_wr;
883
884 list.addr = iu->dma;
885 list.length = len;
886 list.lkey = target->lkey;
887
888 wr.next = NULL;
889 wr.wr_id = (uintptr_t) iu;
890 wr.sg_list = &list;
891 wr.num_sge = 1;
892 wr.opcode = IB_WR_SEND;
893 wr.send_flags = IB_SEND_SIGNALED;
894
895 return ib_post_send(target->qp, &wr, &bad_wr);
896 }
897
898 static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
899 {
900 struct ib_recv_wr wr, *bad_wr;
901 struct ib_sge list;
902
903 list.addr = iu->dma;
904 list.length = iu->size;
905 list.lkey = target->lkey;
906
907 wr.next = NULL;
908 wr.wr_id = (uintptr_t) iu;
909 wr.sg_list = &list;
910 wr.num_sge = 1;
911
912 return ib_post_recv(target->qp, &wr, &bad_wr);
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
921 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
922 spin_lock_irqsave(&target->lock, flags);
923 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
924 spin_unlock_irqrestore(&target->lock, flags);
925
926 target->tsk_mgmt_status = -1;
927 if (be32_to_cpu(rsp->resp_data_len) >= 4)
928 target->tsk_mgmt_status = rsp->data[3];
929 complete(&target->tsk_mgmt_done);
930 } else {
931 req = &target->req_ring[rsp->tag];
932 scmnd = req->scmnd;
933 if (!scmnd)
934 shost_printk(KERN_ERR, target->scsi_host,
935 "Null scmnd for RSP w/tag %016llx\n",
936 (unsigned long long) rsp->tag);
937 scmnd->result = rsp->status;
938
939 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
940 memcpy(scmnd->sense_buffer, rsp->data +
941 be32_to_cpu(rsp->resp_data_len),
942 min_t(int, be32_to_cpu(rsp->sense_data_len),
943 SCSI_SENSE_BUFFERSIZE));
944 }
945
946 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
947 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
948 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
949 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
950
951 srp_remove_req(target, req, be32_to_cpu(rsp->req_lim_delta));
952 scmnd->host_scribble = NULL;
953 scmnd->scsi_done(scmnd);
954 }
955 }
956
957 static int srp_response_common(struct srp_target_port *target, s32 req_delta,
958 void *rsp, int len)
959 {
960 struct ib_device *dev = target->srp_host->srp_dev->dev;
961 unsigned long flags;
962 struct srp_iu *iu;
963 int err;
964
965 spin_lock_irqsave(&target->lock, flags);
966 target->req_lim += req_delta;
967 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
968 spin_unlock_irqrestore(&target->lock, flags);
969
970 if (!iu) {
971 shost_printk(KERN_ERR, target->scsi_host, PFX
972 "no IU available to send response\n");
973 return 1;
974 }
975
976 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
977 memcpy(iu->buf, rsp, len);
978 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
979
980 err = srp_post_send(target, iu, len);
981 if (err) {
982 shost_printk(KERN_ERR, target->scsi_host, PFX
983 "unable to post response: %d\n", err);
984 srp_put_tx_iu(target, iu, SRP_IU_RSP);
985 }
986
987 return err;
988 }
989
990 static void srp_process_cred_req(struct srp_target_port *target,
991 struct srp_cred_req *req)
992 {
993 struct srp_cred_rsp rsp = {
994 .opcode = SRP_CRED_RSP,
995 .tag = req->tag,
996 };
997 s32 delta = be32_to_cpu(req->req_lim_delta);
998
999 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1000 shost_printk(KERN_ERR, target->scsi_host, PFX
1001 "problems processing SRP_CRED_REQ\n");
1002 }
1003
1004 static void srp_process_aer_req(struct srp_target_port *target,
1005 struct srp_aer_req *req)
1006 {
1007 struct srp_aer_rsp rsp = {
1008 .opcode = SRP_AER_RSP,
1009 .tag = req->tag,
1010 };
1011 s32 delta = be32_to_cpu(req->req_lim_delta);
1012
1013 shost_printk(KERN_ERR, target->scsi_host, PFX
1014 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1015
1016 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1017 shost_printk(KERN_ERR, target->scsi_host, PFX
1018 "problems processing SRP_AER_REQ\n");
1019 }
1020
1021 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1022 {
1023 struct ib_device *dev = target->srp_host->srp_dev->dev;
1024 struct srp_iu *iu = (struct srp_iu *) wc->wr_id;
1025 int res;
1026 u8 opcode;
1027
1028 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1029 DMA_FROM_DEVICE);
1030
1031 opcode = *(u8 *) iu->buf;
1032
1033 if (0) {
1034 shost_printk(KERN_ERR, target->scsi_host,
1035 PFX "recv completion, opcode 0x%02x\n", opcode);
1036 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1037 iu->buf, wc->byte_len, true);
1038 }
1039
1040 switch (opcode) {
1041 case SRP_RSP:
1042 srp_process_rsp(target, iu->buf);
1043 break;
1044
1045 case SRP_CRED_REQ:
1046 srp_process_cred_req(target, iu->buf);
1047 break;
1048
1049 case SRP_AER_REQ:
1050 srp_process_aer_req(target, iu->buf);
1051 break;
1052
1053 case SRP_T_LOGOUT:
1054 /* XXX Handle target logout */
1055 shost_printk(KERN_WARNING, target->scsi_host,
1056 PFX "Got target logout request\n");
1057 break;
1058
1059 default:
1060 shost_printk(KERN_WARNING, target->scsi_host,
1061 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1062 break;
1063 }
1064
1065 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1066 DMA_FROM_DEVICE);
1067
1068 res = srp_post_recv(target, iu);
1069 if (res != 0)
1070 shost_printk(KERN_ERR, target->scsi_host,
1071 PFX "Recv failed with error code %d\n", res);
1072 }
1073
1074 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1075 {
1076 struct srp_target_port *target = target_ptr;
1077 struct ib_wc wc;
1078
1079 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1080 while (ib_poll_cq(cq, 1, &wc) > 0) {
1081 if (wc.status) {
1082 shost_printk(KERN_ERR, target->scsi_host,
1083 PFX "failed receive status %d\n",
1084 wc.status);
1085 target->qp_in_error = 1;
1086 break;
1087 }
1088
1089 srp_handle_recv(target, &wc);
1090 }
1091 }
1092
1093 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1094 {
1095 struct srp_target_port *target = target_ptr;
1096 struct ib_wc wc;
1097 struct srp_iu *iu;
1098
1099 while (ib_poll_cq(cq, 1, &wc) > 0) {
1100 if (wc.status) {
1101 shost_printk(KERN_ERR, target->scsi_host,
1102 PFX "failed send status %d\n",
1103 wc.status);
1104 target->qp_in_error = 1;
1105 break;
1106 }
1107
1108 iu = (struct srp_iu *) wc.wr_id;
1109 list_add(&iu->list, &target->free_tx);
1110 }
1111 }
1112
1113 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1114 {
1115 struct srp_target_port *target = host_to_target(shost);
1116 struct srp_request *req;
1117 struct srp_iu *iu;
1118 struct srp_cmd *cmd;
1119 struct ib_device *dev;
1120 unsigned long flags;
1121 int len;
1122
1123 if (target->state == SRP_TARGET_CONNECTING)
1124 goto err;
1125
1126 if (target->state == SRP_TARGET_DEAD ||
1127 target->state == SRP_TARGET_REMOVED) {
1128 scmnd->result = DID_BAD_TARGET << 16;
1129 scmnd->scsi_done(scmnd);
1130 return 0;
1131 }
1132
1133 spin_lock_irqsave(&target->lock, flags);
1134 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1135 if (!iu)
1136 goto err_unlock;
1137
1138 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1139 list_del(&req->list);
1140 spin_unlock_irqrestore(&target->lock, flags);
1141
1142 dev = target->srp_host->srp_dev->dev;
1143 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1144 DMA_TO_DEVICE);
1145
1146 scmnd->result = 0;
1147 scmnd->host_scribble = (void *) req;
1148
1149 cmd = iu->buf;
1150 memset(cmd, 0, sizeof *cmd);
1151
1152 cmd->opcode = SRP_CMD;
1153 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1154 cmd->tag = req->index;
1155 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1156
1157 req->scmnd = scmnd;
1158 req->cmd = iu;
1159
1160 len = srp_map_data(scmnd, target, req);
1161 if (len < 0) {
1162 shost_printk(KERN_ERR, target->scsi_host,
1163 PFX "Failed to map data\n");
1164 goto err_iu;
1165 }
1166
1167 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1168 DMA_TO_DEVICE);
1169
1170 if (srp_post_send(target, iu, len)) {
1171 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1172 goto err_unmap;
1173 }
1174
1175 return 0;
1176
1177 err_unmap:
1178 srp_unmap_data(scmnd, target, req);
1179
1180 err_iu:
1181 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1182
1183 spin_lock_irqsave(&target->lock, flags);
1184 list_add(&req->list, &target->free_reqs);
1185
1186 err_unlock:
1187 spin_unlock_irqrestore(&target->lock, flags);
1188
1189 err:
1190 return SCSI_MLQUEUE_HOST_BUSY;
1191 }
1192
1193 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1194 {
1195 int i;
1196
1197 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1198 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1199 target->max_ti_iu_len,
1200 GFP_KERNEL, DMA_FROM_DEVICE);
1201 if (!target->rx_ring[i])
1202 goto err;
1203 }
1204
1205 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1206 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1207 srp_max_iu_len,
1208 GFP_KERNEL, DMA_TO_DEVICE);
1209 if (!target->tx_ring[i])
1210 goto err;
1211
1212 list_add(&target->tx_ring[i]->list, &target->free_tx);
1213 }
1214
1215 return 0;
1216
1217 err:
1218 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1219 srp_free_iu(target->srp_host, target->rx_ring[i]);
1220 target->rx_ring[i] = NULL;
1221 }
1222
1223 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1224 srp_free_iu(target->srp_host, target->tx_ring[i]);
1225 target->tx_ring[i] = NULL;
1226 }
1227
1228 return -ENOMEM;
1229 }
1230
1231 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1232 struct ib_cm_event *event,
1233 struct srp_target_port *target)
1234 {
1235 struct Scsi_Host *shost = target->scsi_host;
1236 struct ib_class_port_info *cpi;
1237 int opcode;
1238
1239 switch (event->param.rej_rcvd.reason) {
1240 case IB_CM_REJ_PORT_CM_REDIRECT:
1241 cpi = event->param.rej_rcvd.ari;
1242 target->path.dlid = cpi->redirect_lid;
1243 target->path.pkey = cpi->redirect_pkey;
1244 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1245 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1246
1247 target->status = target->path.dlid ?
1248 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1249 break;
1250
1251 case IB_CM_REJ_PORT_REDIRECT:
1252 if (srp_target_is_topspin(target)) {
1253 /*
1254 * Topspin/Cisco SRP gateways incorrectly send
1255 * reject reason code 25 when they mean 24
1256 * (port redirect).
1257 */
1258 memcpy(target->path.dgid.raw,
1259 event->param.rej_rcvd.ari, 16);
1260
1261 shost_printk(KERN_DEBUG, shost,
1262 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1263 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1264 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1265
1266 target->status = SRP_PORT_REDIRECT;
1267 } else {
1268 shost_printk(KERN_WARNING, shost,
1269 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1270 target->status = -ECONNRESET;
1271 }
1272 break;
1273
1274 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1275 shost_printk(KERN_WARNING, shost,
1276 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1277 target->status = -ECONNRESET;
1278 break;
1279
1280 case IB_CM_REJ_CONSUMER_DEFINED:
1281 opcode = *(u8 *) event->private_data;
1282 if (opcode == SRP_LOGIN_REJ) {
1283 struct srp_login_rej *rej = event->private_data;
1284 u32 reason = be32_to_cpu(rej->reason);
1285
1286 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1287 shost_printk(KERN_WARNING, shost,
1288 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1289 else
1290 shost_printk(KERN_WARNING, shost,
1291 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1292 } else
1293 shost_printk(KERN_WARNING, shost,
1294 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1295 " opcode 0x%02x\n", opcode);
1296 target->status = -ECONNRESET;
1297 break;
1298
1299 case IB_CM_REJ_STALE_CONN:
1300 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1301 target->status = SRP_STALE_CONN;
1302 break;
1303
1304 default:
1305 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1306 event->param.rej_rcvd.reason);
1307 target->status = -ECONNRESET;
1308 }
1309 }
1310
1311 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1312 {
1313 struct srp_target_port *target = cm_id->context;
1314 struct ib_qp_attr *qp_attr = NULL;
1315 int attr_mask = 0;
1316 int comp = 0;
1317 int opcode = 0;
1318 int i;
1319
1320 switch (event->event) {
1321 case IB_CM_REQ_ERROR:
1322 shost_printk(KERN_DEBUG, target->scsi_host,
1323 PFX "Sending CM REQ failed\n");
1324 comp = 1;
1325 target->status = -ECONNRESET;
1326 break;
1327
1328 case IB_CM_REP_RECEIVED:
1329 comp = 1;
1330 opcode = *(u8 *) event->private_data;
1331
1332 if (opcode == SRP_LOGIN_RSP) {
1333 struct srp_login_rsp *rsp = event->private_data;
1334
1335 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1336 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1337
1338 /*
1339 * Reserve credits for task management so we don't
1340 * bounce requests back to the SCSI mid-layer.
1341 */
1342 target->scsi_host->can_queue
1343 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1344 target->scsi_host->can_queue);
1345 } else {
1346 shost_printk(KERN_WARNING, target->scsi_host,
1347 PFX "Unhandled RSP opcode %#x\n", opcode);
1348 target->status = -ECONNRESET;
1349 break;
1350 }
1351
1352 if (!target->rx_ring[0]) {
1353 target->status = srp_alloc_iu_bufs(target);
1354 if (target->status)
1355 break;
1356 }
1357
1358 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1359 if (!qp_attr) {
1360 target->status = -ENOMEM;
1361 break;
1362 }
1363
1364 qp_attr->qp_state = IB_QPS_RTR;
1365 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1366 if (target->status)
1367 break;
1368
1369 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1370 if (target->status)
1371 break;
1372
1373 for (i = 0; i < SRP_RQ_SIZE; i++) {
1374 struct srp_iu *iu = target->rx_ring[i];
1375 target->status = srp_post_recv(target, iu);
1376 if (target->status)
1377 break;
1378 }
1379 if (target->status)
1380 break;
1381
1382 qp_attr->qp_state = IB_QPS_RTS;
1383 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1384 if (target->status)
1385 break;
1386
1387 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1388 if (target->status)
1389 break;
1390
1391 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1392 if (target->status)
1393 break;
1394
1395 break;
1396
1397 case IB_CM_REJ_RECEIVED:
1398 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1399 comp = 1;
1400
1401 srp_cm_rej_handler(cm_id, event, target);
1402 break;
1403
1404 case IB_CM_DREQ_RECEIVED:
1405 shost_printk(KERN_WARNING, target->scsi_host,
1406 PFX "DREQ received - connection closed\n");
1407 if (ib_send_cm_drep(cm_id, NULL, 0))
1408 shost_printk(KERN_ERR, target->scsi_host,
1409 PFX "Sending CM DREP failed\n");
1410 break;
1411
1412 case IB_CM_TIMEWAIT_EXIT:
1413 shost_printk(KERN_ERR, target->scsi_host,
1414 PFX "connection closed\n");
1415
1416 comp = 1;
1417 target->status = 0;
1418 break;
1419
1420 case IB_CM_MRA_RECEIVED:
1421 case IB_CM_DREQ_ERROR:
1422 case IB_CM_DREP_RECEIVED:
1423 break;
1424
1425 default:
1426 shost_printk(KERN_WARNING, target->scsi_host,
1427 PFX "Unhandled CM event %d\n", event->event);
1428 break;
1429 }
1430
1431 if (comp)
1432 complete(&target->done);
1433
1434 kfree(qp_attr);
1435
1436 return 0;
1437 }
1438
1439 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1440 u64 req_tag, unsigned int lun, u8 func)
1441 {
1442 struct ib_device *dev = target->srp_host->srp_dev->dev;
1443 struct srp_iu *iu;
1444 struct srp_tsk_mgmt *tsk_mgmt;
1445
1446 if (target->state == SRP_TARGET_DEAD ||
1447 target->state == SRP_TARGET_REMOVED)
1448 return -1;
1449
1450 init_completion(&target->tsk_mgmt_done);
1451
1452 spin_lock_irq(&target->lock);
1453 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1454 spin_unlock_irq(&target->lock);
1455
1456 if (!iu)
1457 return -1;
1458
1459 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1460 DMA_TO_DEVICE);
1461 tsk_mgmt = iu->buf;
1462 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1463
1464 tsk_mgmt->opcode = SRP_TSK_MGMT;
1465 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1466 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
1467 tsk_mgmt->tsk_mgmt_func = func;
1468 tsk_mgmt->task_tag = req_tag;
1469
1470 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1471 DMA_TO_DEVICE);
1472 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
1473 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
1474 return -1;
1475 }
1476
1477 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
1478 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1479 return -1;
1480
1481 return 0;
1482 }
1483
1484 static int srp_abort(struct scsi_cmnd *scmnd)
1485 {
1486 struct srp_target_port *target = host_to_target(scmnd->device->host);
1487 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
1488 int ret = SUCCESS;
1489
1490 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1491
1492 if (!req || target->qp_in_error)
1493 return FAILED;
1494 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
1495 SRP_TSK_ABORT_TASK))
1496 return FAILED;
1497
1498 if (req->scmnd) {
1499 if (!target->tsk_mgmt_status) {
1500 srp_remove_req(target, req, 0);
1501 scmnd->result = DID_ABORT << 16;
1502 } else
1503 ret = FAILED;
1504 }
1505
1506 return ret;
1507 }
1508
1509 static int srp_reset_device(struct scsi_cmnd *scmnd)
1510 {
1511 struct srp_target_port *target = host_to_target(scmnd->device->host);
1512 int i;
1513
1514 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1515
1516 if (target->qp_in_error)
1517 return FAILED;
1518 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
1519 SRP_TSK_LUN_RESET))
1520 return FAILED;
1521 if (target->tsk_mgmt_status)
1522 return FAILED;
1523
1524 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1525 struct srp_request *req = &target->req_ring[i];
1526 if (req->scmnd && req->scmnd->device == scmnd->device)
1527 srp_reset_req(target, req);
1528 }
1529
1530 return SUCCESS;
1531 }
1532
1533 static int srp_reset_host(struct scsi_cmnd *scmnd)
1534 {
1535 struct srp_target_port *target = host_to_target(scmnd->device->host);
1536 int ret = FAILED;
1537
1538 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1539
1540 if (!srp_reconnect_target(target))
1541 ret = SUCCESS;
1542
1543 return ret;
1544 }
1545
1546 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1547 char *buf)
1548 {
1549 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1550
1551 if (target->state == SRP_TARGET_DEAD ||
1552 target->state == SRP_TARGET_REMOVED)
1553 return -ENODEV;
1554
1555 return sprintf(buf, "0x%016llx\n",
1556 (unsigned long long) be64_to_cpu(target->id_ext));
1557 }
1558
1559 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1560 char *buf)
1561 {
1562 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1563
1564 if (target->state == SRP_TARGET_DEAD ||
1565 target->state == SRP_TARGET_REMOVED)
1566 return -ENODEV;
1567
1568 return sprintf(buf, "0x%016llx\n",
1569 (unsigned long long) be64_to_cpu(target->ioc_guid));
1570 }
1571
1572 static ssize_t show_service_id(struct device *dev,
1573 struct device_attribute *attr, char *buf)
1574 {
1575 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1576
1577 if (target->state == SRP_TARGET_DEAD ||
1578 target->state == SRP_TARGET_REMOVED)
1579 return -ENODEV;
1580
1581 return sprintf(buf, "0x%016llx\n",
1582 (unsigned long long) be64_to_cpu(target->service_id));
1583 }
1584
1585 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1586 char *buf)
1587 {
1588 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1589
1590 if (target->state == SRP_TARGET_DEAD ||
1591 target->state == SRP_TARGET_REMOVED)
1592 return -ENODEV;
1593
1594 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1595 }
1596
1597 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1598 char *buf)
1599 {
1600 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1601
1602 if (target->state == SRP_TARGET_DEAD ||
1603 target->state == SRP_TARGET_REMOVED)
1604 return -ENODEV;
1605
1606 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1607 }
1608
1609 static ssize_t show_orig_dgid(struct device *dev,
1610 struct device_attribute *attr, char *buf)
1611 {
1612 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1613
1614 if (target->state == SRP_TARGET_DEAD ||
1615 target->state == SRP_TARGET_REMOVED)
1616 return -ENODEV;
1617
1618 return sprintf(buf, "%pI6\n", target->orig_dgid);
1619 }
1620
1621 static ssize_t show_req_lim(struct device *dev,
1622 struct device_attribute *attr, char *buf)
1623 {
1624 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1625
1626 if (target->state == SRP_TARGET_DEAD ||
1627 target->state == SRP_TARGET_REMOVED)
1628 return -ENODEV;
1629
1630 return sprintf(buf, "%d\n", target->req_lim);
1631 }
1632
1633 static ssize_t show_zero_req_lim(struct device *dev,
1634 struct device_attribute *attr, char *buf)
1635 {
1636 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1637
1638 if (target->state == SRP_TARGET_DEAD ||
1639 target->state == SRP_TARGET_REMOVED)
1640 return -ENODEV;
1641
1642 return sprintf(buf, "%d\n", target->zero_req_lim);
1643 }
1644
1645 static ssize_t show_local_ib_port(struct device *dev,
1646 struct device_attribute *attr, char *buf)
1647 {
1648 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1649
1650 return sprintf(buf, "%d\n", target->srp_host->port);
1651 }
1652
1653 static ssize_t show_local_ib_device(struct device *dev,
1654 struct device_attribute *attr, char *buf)
1655 {
1656 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1657
1658 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1659 }
1660
1661 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1662 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1663 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1664 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1665 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1666 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1667 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
1668 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1669 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1670 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1671
1672 static struct device_attribute *srp_host_attrs[] = {
1673 &dev_attr_id_ext,
1674 &dev_attr_ioc_guid,
1675 &dev_attr_service_id,
1676 &dev_attr_pkey,
1677 &dev_attr_dgid,
1678 &dev_attr_orig_dgid,
1679 &dev_attr_req_lim,
1680 &dev_attr_zero_req_lim,
1681 &dev_attr_local_ib_port,
1682 &dev_attr_local_ib_device,
1683 NULL
1684 };
1685
1686 static struct scsi_host_template srp_template = {
1687 .module = THIS_MODULE,
1688 .name = "InfiniBand SRP initiator",
1689 .proc_name = DRV_NAME,
1690 .info = srp_target_info,
1691 .queuecommand = srp_queuecommand,
1692 .eh_abort_handler = srp_abort,
1693 .eh_device_reset_handler = srp_reset_device,
1694 .eh_host_reset_handler = srp_reset_host,
1695 .can_queue = SRP_CMD_SQ_SIZE,
1696 .this_id = -1,
1697 .cmd_per_lun = SRP_CMD_SQ_SIZE,
1698 .use_clustering = ENABLE_CLUSTERING,
1699 .shost_attrs = srp_host_attrs
1700 };
1701
1702 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1703 {
1704 struct srp_rport_identifiers ids;
1705 struct srp_rport *rport;
1706
1707 sprintf(target->target_name, "SRP.T10:%016llX",
1708 (unsigned long long) be64_to_cpu(target->id_ext));
1709
1710 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1711 return -ENODEV;
1712
1713 memcpy(ids.port_id, &target->id_ext, 8);
1714 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1715 ids.roles = SRP_RPORT_ROLE_TARGET;
1716 rport = srp_rport_add(target->scsi_host, &ids);
1717 if (IS_ERR(rport)) {
1718 scsi_remove_host(target->scsi_host);
1719 return PTR_ERR(rport);
1720 }
1721
1722 spin_lock(&host->target_lock);
1723 list_add_tail(&target->list, &host->target_list);
1724 spin_unlock(&host->target_lock);
1725
1726 target->state = SRP_TARGET_LIVE;
1727
1728 scsi_scan_target(&target->scsi_host->shost_gendev,
1729 0, target->scsi_id, SCAN_WILD_CARD, 0);
1730
1731 return 0;
1732 }
1733
1734 static void srp_release_dev(struct device *dev)
1735 {
1736 struct srp_host *host =
1737 container_of(dev, struct srp_host, dev);
1738
1739 complete(&host->released);
1740 }
1741
1742 static struct class srp_class = {
1743 .name = "infiniband_srp",
1744 .dev_release = srp_release_dev
1745 };
1746
1747 /*
1748 * Target ports are added by writing
1749 *
1750 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1751 * pkey=<P_Key>,service_id=<service ID>
1752 *
1753 * to the add_target sysfs attribute.
1754 */
1755 enum {
1756 SRP_OPT_ERR = 0,
1757 SRP_OPT_ID_EXT = 1 << 0,
1758 SRP_OPT_IOC_GUID = 1 << 1,
1759 SRP_OPT_DGID = 1 << 2,
1760 SRP_OPT_PKEY = 1 << 3,
1761 SRP_OPT_SERVICE_ID = 1 << 4,
1762 SRP_OPT_MAX_SECT = 1 << 5,
1763 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1764 SRP_OPT_IO_CLASS = 1 << 7,
1765 SRP_OPT_INITIATOR_EXT = 1 << 8,
1766 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1767 SRP_OPT_IOC_GUID |
1768 SRP_OPT_DGID |
1769 SRP_OPT_PKEY |
1770 SRP_OPT_SERVICE_ID),
1771 };
1772
1773 static const match_table_t srp_opt_tokens = {
1774 { SRP_OPT_ID_EXT, "id_ext=%s" },
1775 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1776 { SRP_OPT_DGID, "dgid=%s" },
1777 { SRP_OPT_PKEY, "pkey=%x" },
1778 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1779 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1780 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1781 { SRP_OPT_IO_CLASS, "io_class=%x" },
1782 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1783 { SRP_OPT_ERR, NULL }
1784 };
1785
1786 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1787 {
1788 char *options, *sep_opt;
1789 char *p;
1790 char dgid[3];
1791 substring_t args[MAX_OPT_ARGS];
1792 int opt_mask = 0;
1793 int token;
1794 int ret = -EINVAL;
1795 int i;
1796
1797 options = kstrdup(buf, GFP_KERNEL);
1798 if (!options)
1799 return -ENOMEM;
1800
1801 sep_opt = options;
1802 while ((p = strsep(&sep_opt, ",")) != NULL) {
1803 if (!*p)
1804 continue;
1805
1806 token = match_token(p, srp_opt_tokens, args);
1807 opt_mask |= token;
1808
1809 switch (token) {
1810 case SRP_OPT_ID_EXT:
1811 p = match_strdup(args);
1812 if (!p) {
1813 ret = -ENOMEM;
1814 goto out;
1815 }
1816 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1817 kfree(p);
1818 break;
1819
1820 case SRP_OPT_IOC_GUID:
1821 p = match_strdup(args);
1822 if (!p) {
1823 ret = -ENOMEM;
1824 goto out;
1825 }
1826 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1827 kfree(p);
1828 break;
1829
1830 case SRP_OPT_DGID:
1831 p = match_strdup(args);
1832 if (!p) {
1833 ret = -ENOMEM;
1834 goto out;
1835 }
1836 if (strlen(p) != 32) {
1837 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1838 kfree(p);
1839 goto out;
1840 }
1841
1842 for (i = 0; i < 16; ++i) {
1843 strlcpy(dgid, p + i * 2, 3);
1844 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1845 }
1846 kfree(p);
1847 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1848 break;
1849
1850 case SRP_OPT_PKEY:
1851 if (match_hex(args, &token)) {
1852 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1853 goto out;
1854 }
1855 target->path.pkey = cpu_to_be16(token);
1856 break;
1857
1858 case SRP_OPT_SERVICE_ID:
1859 p = match_strdup(args);
1860 if (!p) {
1861 ret = -ENOMEM;
1862 goto out;
1863 }
1864 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1865 target->path.service_id = target->service_id;
1866 kfree(p);
1867 break;
1868
1869 case SRP_OPT_MAX_SECT:
1870 if (match_int(args, &token)) {
1871 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1872 goto out;
1873 }
1874 target->scsi_host->max_sectors = token;
1875 break;
1876
1877 case SRP_OPT_MAX_CMD_PER_LUN:
1878 if (match_int(args, &token)) {
1879 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1880 goto out;
1881 }
1882 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
1883 break;
1884
1885 case SRP_OPT_IO_CLASS:
1886 if (match_hex(args, &token)) {
1887 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1888 goto out;
1889 }
1890 if (token != SRP_REV10_IB_IO_CLASS &&
1891 token != SRP_REV16A_IB_IO_CLASS) {
1892 printk(KERN_WARNING PFX "unknown IO class parameter value"
1893 " %x specified (use %x or %x).\n",
1894 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1895 goto out;
1896 }
1897 target->io_class = token;
1898 break;
1899
1900 case SRP_OPT_INITIATOR_EXT:
1901 p = match_strdup(args);
1902 if (!p) {
1903 ret = -ENOMEM;
1904 goto out;
1905 }
1906 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1907 kfree(p);
1908 break;
1909
1910 default:
1911 printk(KERN_WARNING PFX "unknown parameter or missing value "
1912 "'%s' in target creation request\n", p);
1913 goto out;
1914 }
1915 }
1916
1917 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1918 ret = 0;
1919 else
1920 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1921 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1922 !(srp_opt_tokens[i].token & opt_mask))
1923 printk(KERN_WARNING PFX "target creation request is "
1924 "missing parameter '%s'\n",
1925 srp_opt_tokens[i].pattern);
1926
1927 out:
1928 kfree(options);
1929 return ret;
1930 }
1931
1932 static ssize_t srp_create_target(struct device *dev,
1933 struct device_attribute *attr,
1934 const char *buf, size_t count)
1935 {
1936 struct srp_host *host =
1937 container_of(dev, struct srp_host, dev);
1938 struct Scsi_Host *target_host;
1939 struct srp_target_port *target;
1940 int ret;
1941 int i;
1942
1943 target_host = scsi_host_alloc(&srp_template,
1944 sizeof (struct srp_target_port));
1945 if (!target_host)
1946 return -ENOMEM;
1947
1948 target_host->transportt = ib_srp_transport_template;
1949 target_host->max_lun = SRP_MAX_LUN;
1950 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1951
1952 target = host_to_target(target_host);
1953
1954 target->io_class = SRP_REV16A_IB_IO_CLASS;
1955 target->scsi_host = target_host;
1956 target->srp_host = host;
1957 target->lkey = host->srp_dev->mr->lkey;
1958 target->rkey = host->srp_dev->mr->rkey;
1959
1960 spin_lock_init(&target->lock);
1961 INIT_LIST_HEAD(&target->free_tx);
1962 INIT_LIST_HEAD(&target->free_reqs);
1963 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1964 target->req_ring[i].index = i;
1965 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1966 }
1967
1968 ret = srp_parse_options(buf, target);
1969 if (ret)
1970 goto err;
1971
1972 ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1973
1974 shost_printk(KERN_DEBUG, target->scsi_host, PFX
1975 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1976 "service_id %016llx dgid %pI6\n",
1977 (unsigned long long) be64_to_cpu(target->id_ext),
1978 (unsigned long long) be64_to_cpu(target->ioc_guid),
1979 be16_to_cpu(target->path.pkey),
1980 (unsigned long long) be64_to_cpu(target->service_id),
1981 target->path.dgid.raw);
1982
1983 ret = srp_create_target_ib(target);
1984 if (ret)
1985 goto err;
1986
1987 ret = srp_new_cm_id(target);
1988 if (ret)
1989 goto err_free;
1990
1991 target->qp_in_error = 0;
1992 ret = srp_connect_target(target);
1993 if (ret) {
1994 shost_printk(KERN_ERR, target->scsi_host,
1995 PFX "Connection failed\n");
1996 goto err_cm_id;
1997 }
1998
1999 ret = srp_add_target(host, target);
2000 if (ret)
2001 goto err_disconnect;
2002
2003 return count;
2004
2005 err_disconnect:
2006 srp_disconnect_target(target);
2007
2008 err_cm_id:
2009 ib_destroy_cm_id(target->cm_id);
2010
2011 err_free:
2012 srp_free_target_ib(target);
2013
2014 err:
2015 scsi_host_put(target_host);
2016
2017 return ret;
2018 }
2019
2020 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2021
2022 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2023 char *buf)
2024 {
2025 struct srp_host *host = container_of(dev, struct srp_host, dev);
2026
2027 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2028 }
2029
2030 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2031
2032 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2033 char *buf)
2034 {
2035 struct srp_host *host = container_of(dev, struct srp_host, dev);
2036
2037 return sprintf(buf, "%d\n", host->port);
2038 }
2039
2040 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2041
2042 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2043 {
2044 struct srp_host *host;
2045
2046 host = kzalloc(sizeof *host, GFP_KERNEL);
2047 if (!host)
2048 return NULL;
2049
2050 INIT_LIST_HEAD(&host->target_list);
2051 spin_lock_init(&host->target_lock);
2052 init_completion(&host->released);
2053 host->srp_dev = device;
2054 host->port = port;
2055
2056 host->dev.class = &srp_class;
2057 host->dev.parent = device->dev->dma_device;
2058 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2059
2060 if (device_register(&host->dev))
2061 goto free_host;
2062 if (device_create_file(&host->dev, &dev_attr_add_target))
2063 goto err_class;
2064 if (device_create_file(&host->dev, &dev_attr_ibdev))
2065 goto err_class;
2066 if (device_create_file(&host->dev, &dev_attr_port))
2067 goto err_class;
2068
2069 return host;
2070
2071 err_class:
2072 device_unregister(&host->dev);
2073
2074 free_host:
2075 kfree(host);
2076
2077 return NULL;
2078 }
2079
2080 static void srp_add_one(struct ib_device *device)
2081 {
2082 struct srp_device *srp_dev;
2083 struct ib_device_attr *dev_attr;
2084 struct ib_fmr_pool_param fmr_param;
2085 struct srp_host *host;
2086 int s, e, p;
2087
2088 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2089 if (!dev_attr)
2090 return;
2091
2092 if (ib_query_device(device, dev_attr)) {
2093 printk(KERN_WARNING PFX "Query device failed for %s\n",
2094 device->name);
2095 goto free_attr;
2096 }
2097
2098 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2099 if (!srp_dev)
2100 goto free_attr;
2101
2102 /*
2103 * Use the smallest page size supported by the HCA, down to a
2104 * minimum of 512 bytes (which is the smallest sector that a
2105 * SCSI command will ever carry).
2106 */
2107 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2108 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
2109 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2110
2111 INIT_LIST_HEAD(&srp_dev->dev_list);
2112
2113 srp_dev->dev = device;
2114 srp_dev->pd = ib_alloc_pd(device);
2115 if (IS_ERR(srp_dev->pd))
2116 goto free_dev;
2117
2118 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2119 IB_ACCESS_LOCAL_WRITE |
2120 IB_ACCESS_REMOTE_READ |
2121 IB_ACCESS_REMOTE_WRITE);
2122 if (IS_ERR(srp_dev->mr))
2123 goto err_pd;
2124
2125 memset(&fmr_param, 0, sizeof fmr_param);
2126 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2127 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2128 fmr_param.cache = 1;
2129 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2130 fmr_param.page_shift = srp_dev->fmr_page_shift;
2131 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2132 IB_ACCESS_REMOTE_WRITE |
2133 IB_ACCESS_REMOTE_READ);
2134
2135 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2136 if (IS_ERR(srp_dev->fmr_pool))
2137 srp_dev->fmr_pool = NULL;
2138
2139 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2140 s = 0;
2141 e = 0;
2142 } else {
2143 s = 1;
2144 e = device->phys_port_cnt;
2145 }
2146
2147 for (p = s; p <= e; ++p) {
2148 host = srp_add_port(srp_dev, p);
2149 if (host)
2150 list_add_tail(&host->list, &srp_dev->dev_list);
2151 }
2152
2153 ib_set_client_data(device, &srp_client, srp_dev);
2154
2155 goto free_attr;
2156
2157 err_pd:
2158 ib_dealloc_pd(srp_dev->pd);
2159
2160 free_dev:
2161 kfree(srp_dev);
2162
2163 free_attr:
2164 kfree(dev_attr);
2165 }
2166
2167 static void srp_remove_one(struct ib_device *device)
2168 {
2169 struct srp_device *srp_dev;
2170 struct srp_host *host, *tmp_host;
2171 LIST_HEAD(target_list);
2172 struct srp_target_port *target, *tmp_target;
2173
2174 srp_dev = ib_get_client_data(device, &srp_client);
2175
2176 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2177 device_unregister(&host->dev);
2178 /*
2179 * Wait for the sysfs entry to go away, so that no new
2180 * target ports can be created.
2181 */
2182 wait_for_completion(&host->released);
2183
2184 /*
2185 * Mark all target ports as removed, so we stop queueing
2186 * commands and don't try to reconnect.
2187 */
2188 spin_lock(&host->target_lock);
2189 list_for_each_entry(target, &host->target_list, list) {
2190 spin_lock_irq(&target->lock);
2191 target->state = SRP_TARGET_REMOVED;
2192 spin_unlock_irq(&target->lock);
2193 }
2194 spin_unlock(&host->target_lock);
2195
2196 /*
2197 * Wait for any reconnection tasks that may have
2198 * started before we marked our target ports as
2199 * removed, and any target port removal tasks.
2200 */
2201 flush_scheduled_work();
2202
2203 list_for_each_entry_safe(target, tmp_target,
2204 &host->target_list, list) {
2205 srp_remove_host(target->scsi_host);
2206 scsi_remove_host(target->scsi_host);
2207 srp_disconnect_target(target);
2208 ib_destroy_cm_id(target->cm_id);
2209 srp_free_target_ib(target);
2210 scsi_host_put(target->scsi_host);
2211 }
2212
2213 kfree(host);
2214 }
2215
2216 if (srp_dev->fmr_pool)
2217 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2218 ib_dereg_mr(srp_dev->mr);
2219 ib_dealloc_pd(srp_dev->pd);
2220
2221 kfree(srp_dev);
2222 }
2223
2224 static struct srp_function_template ib_srp_transport_functions = {
2225 };
2226
2227 static int __init srp_init_module(void)
2228 {
2229 int ret;
2230
2231 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2232
2233 if (srp_sg_tablesize > 255) {
2234 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2235 srp_sg_tablesize = 255;
2236 }
2237
2238 ib_srp_transport_template =
2239 srp_attach_transport(&ib_srp_transport_functions);
2240 if (!ib_srp_transport_template)
2241 return -ENOMEM;
2242
2243 srp_template.sg_tablesize = srp_sg_tablesize;
2244 srp_max_iu_len = (sizeof (struct srp_cmd) +
2245 sizeof (struct srp_indirect_buf) +
2246 srp_sg_tablesize * 16);
2247
2248 ret = class_register(&srp_class);
2249 if (ret) {
2250 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2251 srp_release_transport(ib_srp_transport_template);
2252 return ret;
2253 }
2254
2255 ib_sa_register_client(&srp_sa_client);
2256
2257 ret = ib_register_client(&srp_client);
2258 if (ret) {
2259 printk(KERN_ERR PFX "couldn't register IB client\n");
2260 srp_release_transport(ib_srp_transport_template);
2261 ib_sa_unregister_client(&srp_sa_client);
2262 class_unregister(&srp_class);
2263 return ret;
2264 }
2265
2266 return 0;
2267 }
2268
2269 static void __exit srp_cleanup_module(void)
2270 {
2271 ib_unregister_client(&srp_client);
2272 ib_sa_unregister_client(&srp_sa_client);
2273 class_unregister(&srp_class);
2274 srp_release_transport(ib_srp_transport_template);
2275 }
2276
2277 module_init(srp_init_module);
2278 module_exit(srp_cleanup_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree