?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
IB/srp: Clean up error path in srp_create_target_ib()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / infiniband / ulp / srp / ib_srp.c
blobed3f9ebae882b880e8446e5e572ad8600019c796
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 + 1; ++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 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
815 {
816 struct srp_request *req;
817 struct scsi_cmnd *scmnd;
818 unsigned long flags;
819 s32 delta;
820
821 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
822
823 spin_lock_irqsave(target->scsi_host->host_lock, flags);
824
825 target->req_lim += delta;
826
827 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
828
829 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
830 if (be32_to_cpu(rsp->resp_data_len) < 4)
831 req->tsk_status = -1;
832 else
833 req->tsk_status = rsp->data[3];
834 complete(&req->done);
835 } else {
836 scmnd = req->scmnd;
837 if (!scmnd)
838 shost_printk(KERN_ERR, target->scsi_host,
839 "Null scmnd for RSP w/tag %016llx\n",
840 (unsigned long long) rsp->tag);
841 scmnd->result = rsp->status;
842
843 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
844 memcpy(scmnd->sense_buffer, rsp->data +
845 be32_to_cpu(rsp->resp_data_len),
846 min_t(int, be32_to_cpu(rsp->sense_data_len),
847 SCSI_SENSE_BUFFERSIZE));
848 }
849
850 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
851 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
852 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
853 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
854
855 if (!req->tsk_mgmt) {
856 scmnd->host_scribble = (void *) -1L;
857 scmnd->scsi_done(scmnd);
858
859 srp_remove_req(target, req);
860 } else
861 req->cmd_done = 1;
862 }
863
864 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
865 }
866
867 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
868 {
869 struct ib_device *dev;
870 struct srp_iu *iu;
871 u8 opcode;
872
873 iu = target->rx_ring[wc->wr_id];
874
875 dev = target->srp_host->srp_dev->dev;
876 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
877 DMA_FROM_DEVICE);
878
879 opcode = *(u8 *) iu->buf;
880
881 if (0) {
882 int i;
883
884 shost_printk(KERN_ERR, target->scsi_host,
885 PFX "recv completion, opcode 0x%02x\n", opcode);
886
887 for (i = 0; i < wc->byte_len; ++i) {
888 if (i % 8 == 0)
889 printk(KERN_ERR " [%02x] ", i);
890 printk(" %02x", ((u8 *) iu->buf)[i]);
891 if ((i + 1) % 8 == 0)
892 printk("\n");
893 }
894
895 if (wc->byte_len % 8)
896 printk("\n");
897 }
898
899 switch (opcode) {
900 case SRP_RSP:
901 srp_process_rsp(target, iu->buf);
902 break;
903
904 case SRP_T_LOGOUT:
905 /* XXX Handle target logout */
906 shost_printk(KERN_WARNING, target->scsi_host,
907 PFX "Got target logout request\n");
908 break;
909
910 default:
911 shost_printk(KERN_WARNING, target->scsi_host,
912 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
913 break;
914 }
915
916 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
917 DMA_FROM_DEVICE);
918 }
919
920 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
921 {
922 struct srp_target_port *target = target_ptr;
923 struct ib_wc wc;
924
925 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
926 while (ib_poll_cq(cq, 1, &wc) > 0) {
927 if (wc.status) {
928 shost_printk(KERN_ERR, target->scsi_host,
929 PFX "failed receive status %d\n",
930 wc.status);
931 target->qp_in_error = 1;
932 break;
933 }
934
935 srp_handle_recv(target, &wc);
936 }
937 }
938
939 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
940 {
941 struct srp_target_port *target = target_ptr;
942 struct ib_wc wc;
943
944 while (ib_poll_cq(cq, 1, &wc) > 0) {
945 if (wc.status) {
946 shost_printk(KERN_ERR, target->scsi_host,
947 PFX "failed send status %d\n",
948 wc.status);
949 target->qp_in_error = 1;
950 break;
951 }
952
953 ++target->tx_tail;
954 }
955 }
956
957 static int __srp_post_recv(struct srp_target_port *target)
958 {
959 struct srp_iu *iu;
960 struct ib_sge list;
961 struct ib_recv_wr wr, *bad_wr;
962 unsigned int next;
963 int ret;
964
965 next = target->rx_head & (SRP_RQ_SIZE - 1);
966 wr.wr_id = next;
967 iu = target->rx_ring[next];
968
969 list.addr = iu->dma;
970 list.length = iu->size;
971 list.lkey = target->srp_host->srp_dev->mr->lkey;
972
973 wr.next = NULL;
974 wr.sg_list = &list;
975 wr.num_sge = 1;
976
977 ret = ib_post_recv(target->qp, &wr, &bad_wr);
978 if (!ret)
979 ++target->rx_head;
980
981 return ret;
982 }
983
984 static int srp_post_recv(struct srp_target_port *target)
985 {
986 unsigned long flags;
987 int ret;
988
989 spin_lock_irqsave(target->scsi_host->host_lock, flags);
990 ret = __srp_post_recv(target);
991 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
992
993 return ret;
994 }
995
996 /*
997 * Must be called with target->scsi_host->host_lock held to protect
998 * req_lim and tx_head. Lock cannot be dropped between call here and
999 * call to __srp_post_send().
1000 */
1001 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1002 enum srp_request_type req_type)
1003 {
1004 s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
1005
1006 srp_send_completion(target->send_cq, target);
1007
1008 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
1009 return NULL;
1010
1011 if (target->req_lim < min) {
1012 ++target->zero_req_lim;
1013 return NULL;
1014 }
1015
1016 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
1017 }
1018
1019 /*
1020 * Must be called with target->scsi_host->host_lock held to protect
1021 * req_lim and tx_head.
1022 */
1023 static int __srp_post_send(struct srp_target_port *target,
1024 struct srp_iu *iu, int len)
1025 {
1026 struct ib_sge list;
1027 struct ib_send_wr wr, *bad_wr;
1028 int ret = 0;
1029
1030 list.addr = iu->dma;
1031 list.length = len;
1032 list.lkey = target->srp_host->srp_dev->mr->lkey;
1033
1034 wr.next = NULL;
1035 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
1036 wr.sg_list = &list;
1037 wr.num_sge = 1;
1038 wr.opcode = IB_WR_SEND;
1039 wr.send_flags = IB_SEND_SIGNALED;
1040
1041 ret = ib_post_send(target->qp, &wr, &bad_wr);
1042
1043 if (!ret) {
1044 ++target->tx_head;
1045 --target->req_lim;
1046 }
1047
1048 return ret;
1049 }
1050
1051 static int srp_queuecommand(struct scsi_cmnd *scmnd,
1052 void (*done)(struct scsi_cmnd *))
1053 {
1054 struct srp_target_port *target = host_to_target(scmnd->device->host);
1055 struct srp_request *req;
1056 struct srp_iu *iu;
1057 struct srp_cmd *cmd;
1058 struct ib_device *dev;
1059 int len;
1060
1061 if (target->state == SRP_TARGET_CONNECTING)
1062 goto err;
1063
1064 if (target->state == SRP_TARGET_DEAD ||
1065 target->state == SRP_TARGET_REMOVED) {
1066 scmnd->result = DID_BAD_TARGET << 16;
1067 done(scmnd);
1068 return 0;
1069 }
1070
1071 iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1072 if (!iu)
1073 goto err;
1074
1075 dev = target->srp_host->srp_dev->dev;
1076 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1077 DMA_TO_DEVICE);
1078
1079 req = list_entry(target->free_reqs.next, struct srp_request, list);
1080
1081 scmnd->scsi_done = done;
1082 scmnd->result = 0;
1083 scmnd->host_scribble = (void *) (long) req->index;
1084
1085 cmd = iu->buf;
1086 memset(cmd, 0, sizeof *cmd);
1087
1088 cmd->opcode = SRP_CMD;
1089 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1090 cmd->tag = req->index;
1091 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1092
1093 req->scmnd = scmnd;
1094 req->cmd = iu;
1095 req->cmd_done = 0;
1096 req->tsk_mgmt = NULL;
1097
1098 len = srp_map_data(scmnd, target, req);
1099 if (len < 0) {
1100 shost_printk(KERN_ERR, target->scsi_host,
1101 PFX "Failed to map data\n");
1102 goto err;
1103 }
1104
1105 if (__srp_post_recv(target)) {
1106 shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1107 goto err_unmap;
1108 }
1109
1110 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1111 DMA_TO_DEVICE);
1112
1113 if (__srp_post_send(target, iu, len)) {
1114 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1115 goto err_unmap;
1116 }
1117
1118 list_move_tail(&req->list, &target->req_queue);
1119
1120 return 0;
1121
1122 err_unmap:
1123 srp_unmap_data(scmnd, target, req);
1124
1125 err:
1126 return SCSI_MLQUEUE_HOST_BUSY;
1127 }
1128
1129 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1130 {
1131 int i;
1132
1133 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1134 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1135 target->max_ti_iu_len,
1136 GFP_KERNEL, DMA_FROM_DEVICE);
1137 if (!target->rx_ring[i])
1138 goto err;
1139 }
1140
1141 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1142 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1143 srp_max_iu_len,
1144 GFP_KERNEL, DMA_TO_DEVICE);
1145 if (!target->tx_ring[i])
1146 goto err;
1147 }
1148
1149 return 0;
1150
1151 err:
1152 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1153 srp_free_iu(target->srp_host, target->rx_ring[i]);
1154 target->rx_ring[i] = NULL;
1155 }
1156
1157 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1158 srp_free_iu(target->srp_host, target->tx_ring[i]);
1159 target->tx_ring[i] = NULL;
1160 }
1161
1162 return -ENOMEM;
1163 }
1164
1165 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1166 struct ib_cm_event *event,
1167 struct srp_target_port *target)
1168 {
1169 struct Scsi_Host *shost = target->scsi_host;
1170 struct ib_class_port_info *cpi;
1171 int opcode;
1172
1173 switch (event->param.rej_rcvd.reason) {
1174 case IB_CM_REJ_PORT_CM_REDIRECT:
1175 cpi = event->param.rej_rcvd.ari;
1176 target->path.dlid = cpi->redirect_lid;
1177 target->path.pkey = cpi->redirect_pkey;
1178 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1179 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1180
1181 target->status = target->path.dlid ?
1182 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1183 break;
1184
1185 case IB_CM_REJ_PORT_REDIRECT:
1186 if (srp_target_is_topspin(target)) {
1187 /*
1188 * Topspin/Cisco SRP gateways incorrectly send
1189 * reject reason code 25 when they mean 24
1190 * (port redirect).
1191 */
1192 memcpy(target->path.dgid.raw,
1193 event->param.rej_rcvd.ari, 16);
1194
1195 shost_printk(KERN_DEBUG, shost,
1196 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1197 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1198 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1199
1200 target->status = SRP_PORT_REDIRECT;
1201 } else {
1202 shost_printk(KERN_WARNING, shost,
1203 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1204 target->status = -ECONNRESET;
1205 }
1206 break;
1207
1208 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1209 shost_printk(KERN_WARNING, shost,
1210 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1211 target->status = -ECONNRESET;
1212 break;
1213
1214 case IB_CM_REJ_CONSUMER_DEFINED:
1215 opcode = *(u8 *) event->private_data;
1216 if (opcode == SRP_LOGIN_REJ) {
1217 struct srp_login_rej *rej = event->private_data;
1218 u32 reason = be32_to_cpu(rej->reason);
1219
1220 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1221 shost_printk(KERN_WARNING, shost,
1222 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1223 else
1224 shost_printk(KERN_WARNING, shost,
1225 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1226 } else
1227 shost_printk(KERN_WARNING, shost,
1228 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1229 " opcode 0x%02x\n", opcode);
1230 target->status = -ECONNRESET;
1231 break;
1232
1233 case IB_CM_REJ_STALE_CONN:
1234 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1235 target->status = SRP_STALE_CONN;
1236 break;
1237
1238 default:
1239 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1240 event->param.rej_rcvd.reason);
1241 target->status = -ECONNRESET;
1242 }
1243 }
1244
1245 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1246 {
1247 struct srp_target_port *target = cm_id->context;
1248 struct ib_qp_attr *qp_attr = NULL;
1249 int attr_mask = 0;
1250 int comp = 0;
1251 int opcode = 0;
1252
1253 switch (event->event) {
1254 case IB_CM_REQ_ERROR:
1255 shost_printk(KERN_DEBUG, target->scsi_host,
1256 PFX "Sending CM REQ failed\n");
1257 comp = 1;
1258 target->status = -ECONNRESET;
1259 break;
1260
1261 case IB_CM_REP_RECEIVED:
1262 comp = 1;
1263 opcode = *(u8 *) event->private_data;
1264
1265 if (opcode == SRP_LOGIN_RSP) {
1266 struct srp_login_rsp *rsp = event->private_data;
1267
1268 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1269 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1270
1271 target->scsi_host->can_queue = min(target->req_lim,
1272 target->scsi_host->can_queue);
1273 } else {
1274 shost_printk(KERN_WARNING, target->scsi_host,
1275 PFX "Unhandled RSP opcode %#x\n", opcode);
1276 target->status = -ECONNRESET;
1277 break;
1278 }
1279
1280 if (!target->rx_ring[0]) {
1281 target->status = srp_alloc_iu_bufs(target);
1282 if (target->status)
1283 break;
1284 }
1285
1286 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1287 if (!qp_attr) {
1288 target->status = -ENOMEM;
1289 break;
1290 }
1291
1292 qp_attr->qp_state = IB_QPS_RTR;
1293 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1294 if (target->status)
1295 break;
1296
1297 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1298 if (target->status)
1299 break;
1300
1301 target->status = srp_post_recv(target);
1302 if (target->status)
1303 break;
1304
1305 qp_attr->qp_state = IB_QPS_RTS;
1306 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1307 if (target->status)
1308 break;
1309
1310 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1311 if (target->status)
1312 break;
1313
1314 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1315 if (target->status)
1316 break;
1317
1318 break;
1319
1320 case IB_CM_REJ_RECEIVED:
1321 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1322 comp = 1;
1323
1324 srp_cm_rej_handler(cm_id, event, target);
1325 break;
1326
1327 case IB_CM_DREQ_RECEIVED:
1328 shost_printk(KERN_WARNING, target->scsi_host,
1329 PFX "DREQ received - connection closed\n");
1330 if (ib_send_cm_drep(cm_id, NULL, 0))
1331 shost_printk(KERN_ERR, target->scsi_host,
1332 PFX "Sending CM DREP failed\n");
1333 break;
1334
1335 case IB_CM_TIMEWAIT_EXIT:
1336 shost_printk(KERN_ERR, target->scsi_host,
1337 PFX "connection closed\n");
1338
1339 comp = 1;
1340 target->status = 0;
1341 break;
1342
1343 case IB_CM_MRA_RECEIVED:
1344 case IB_CM_DREQ_ERROR:
1345 case IB_CM_DREP_RECEIVED:
1346 break;
1347
1348 default:
1349 shost_printk(KERN_WARNING, target->scsi_host,
1350 PFX "Unhandled CM event %d\n", event->event);
1351 break;
1352 }
1353
1354 if (comp)
1355 complete(&target->done);
1356
1357 kfree(qp_attr);
1358
1359 return 0;
1360 }
1361
1362 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1363 struct srp_request *req, u8 func)
1364 {
1365 struct srp_iu *iu;
1366 struct srp_tsk_mgmt *tsk_mgmt;
1367
1368 spin_lock_irq(target->scsi_host->host_lock);
1369
1370 if (target->state == SRP_TARGET_DEAD ||
1371 target->state == SRP_TARGET_REMOVED) {
1372 req->scmnd->result = DID_BAD_TARGET << 16;
1373 goto out;
1374 }
1375
1376 init_completion(&req->done);
1377
1378 iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1379 if (!iu)
1380 goto out;
1381
1382 tsk_mgmt = iu->buf;
1383 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1384
1385 tsk_mgmt->opcode = SRP_TSK_MGMT;
1386 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1387 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1388 tsk_mgmt->tsk_mgmt_func = func;
1389 tsk_mgmt->task_tag = req->index;
1390
1391 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1392 goto out;
1393
1394 req->tsk_mgmt = iu;
1395
1396 spin_unlock_irq(target->scsi_host->host_lock);
1397
1398 if (!wait_for_completion_timeout(&req->done,
1399 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1400 return -1;
1401
1402 return 0;
1403
1404 out:
1405 spin_unlock_irq(target->scsi_host->host_lock);
1406 return -1;
1407 }
1408
1409 static int srp_find_req(struct srp_target_port *target,
1410 struct scsi_cmnd *scmnd,
1411 struct srp_request **req)
1412 {
1413 if (scmnd->host_scribble == (void *) -1L)
1414 return -1;
1415
1416 *req = &target->req_ring[(long) scmnd->host_scribble];
1417
1418 return 0;
1419 }
1420
1421 static int srp_abort(struct scsi_cmnd *scmnd)
1422 {
1423 struct srp_target_port *target = host_to_target(scmnd->device->host);
1424 struct srp_request *req;
1425 int ret = SUCCESS;
1426
1427 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1428
1429 if (target->qp_in_error)
1430 return FAILED;
1431 if (srp_find_req(target, scmnd, &req))
1432 return FAILED;
1433 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1434 return FAILED;
1435
1436 spin_lock_irq(target->scsi_host->host_lock);
1437
1438 if (req->cmd_done) {
1439 srp_remove_req(target, req);
1440 scmnd->scsi_done(scmnd);
1441 } else if (!req->tsk_status) {
1442 srp_remove_req(target, req);
1443 scmnd->result = DID_ABORT << 16;
1444 } else
1445 ret = FAILED;
1446
1447 spin_unlock_irq(target->scsi_host->host_lock);
1448
1449 return ret;
1450 }
1451
1452 static int srp_reset_device(struct scsi_cmnd *scmnd)
1453 {
1454 struct srp_target_port *target = host_to_target(scmnd->device->host);
1455 struct srp_request *req, *tmp;
1456
1457 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1458
1459 if (target->qp_in_error)
1460 return FAILED;
1461 if (srp_find_req(target, scmnd, &req))
1462 return FAILED;
1463 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1464 return FAILED;
1465 if (req->tsk_status)
1466 return FAILED;
1467
1468 spin_lock_irq(target->scsi_host->host_lock);
1469
1470 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1471 if (req->scmnd->device == scmnd->device)
1472 srp_reset_req(target, req);
1473
1474 spin_unlock_irq(target->scsi_host->host_lock);
1475
1476 return SUCCESS;
1477 }
1478
1479 static int srp_reset_host(struct scsi_cmnd *scmnd)
1480 {
1481 struct srp_target_port *target = host_to_target(scmnd->device->host);
1482 int ret = FAILED;
1483
1484 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1485
1486 if (!srp_reconnect_target(target))
1487 ret = SUCCESS;
1488
1489 return ret;
1490 }
1491
1492 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1493 char *buf)
1494 {
1495 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1496
1497 if (target->state == SRP_TARGET_DEAD ||
1498 target->state == SRP_TARGET_REMOVED)
1499 return -ENODEV;
1500
1501 return sprintf(buf, "0x%016llx\n",
1502 (unsigned long long) be64_to_cpu(target->id_ext));
1503 }
1504
1505 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1506 char *buf)
1507 {
1508 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1509
1510 if (target->state == SRP_TARGET_DEAD ||
1511 target->state == SRP_TARGET_REMOVED)
1512 return -ENODEV;
1513
1514 return sprintf(buf, "0x%016llx\n",
1515 (unsigned long long) be64_to_cpu(target->ioc_guid));
1516 }
1517
1518 static ssize_t show_service_id(struct device *dev,
1519 struct device_attribute *attr, char *buf)
1520 {
1521 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1522
1523 if (target->state == SRP_TARGET_DEAD ||
1524 target->state == SRP_TARGET_REMOVED)
1525 return -ENODEV;
1526
1527 return sprintf(buf, "0x%016llx\n",
1528 (unsigned long long) be64_to_cpu(target->service_id));
1529 }
1530
1531 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1532 char *buf)
1533 {
1534 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1535
1536 if (target->state == SRP_TARGET_DEAD ||
1537 target->state == SRP_TARGET_REMOVED)
1538 return -ENODEV;
1539
1540 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1541 }
1542
1543 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1544 char *buf)
1545 {
1546 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1547
1548 if (target->state == SRP_TARGET_DEAD ||
1549 target->state == SRP_TARGET_REMOVED)
1550 return -ENODEV;
1551
1552 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1553 }
1554
1555 static ssize_t show_orig_dgid(struct device *dev,
1556 struct device_attribute *attr, char *buf)
1557 {
1558 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1559
1560 if (target->state == SRP_TARGET_DEAD ||
1561 target->state == SRP_TARGET_REMOVED)
1562 return -ENODEV;
1563
1564 return sprintf(buf, "%pI6\n", target->orig_dgid);
1565 }
1566
1567 static ssize_t show_zero_req_lim(struct device *dev,
1568 struct device_attribute *attr, char *buf)
1569 {
1570 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1571
1572 if (target->state == SRP_TARGET_DEAD ||
1573 target->state == SRP_TARGET_REMOVED)
1574 return -ENODEV;
1575
1576 return sprintf(buf, "%d\n", target->zero_req_lim);
1577 }
1578
1579 static ssize_t show_local_ib_port(struct device *dev,
1580 struct device_attribute *attr, char *buf)
1581 {
1582 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1583
1584 return sprintf(buf, "%d\n", target->srp_host->port);
1585 }
1586
1587 static ssize_t show_local_ib_device(struct device *dev,
1588 struct device_attribute *attr, char *buf)
1589 {
1590 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1591
1592 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1593 }
1594
1595 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1596 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1597 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1598 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1599 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1600 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1601 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1602 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1603 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1604
1605 static struct device_attribute *srp_host_attrs[] = {
1606 &dev_attr_id_ext,
1607 &dev_attr_ioc_guid,
1608 &dev_attr_service_id,
1609 &dev_attr_pkey,
1610 &dev_attr_dgid,
1611 &dev_attr_orig_dgid,
1612 &dev_attr_zero_req_lim,
1613 &dev_attr_local_ib_port,
1614 &dev_attr_local_ib_device,
1615 NULL
1616 };
1617
1618 static struct scsi_host_template srp_template = {
1619 .module = THIS_MODULE,
1620 .name = "InfiniBand SRP initiator",
1621 .proc_name = DRV_NAME,
1622 .info = srp_target_info,
1623 .queuecommand = srp_queuecommand,
1624 .eh_abort_handler = srp_abort,
1625 .eh_device_reset_handler = srp_reset_device,
1626 .eh_host_reset_handler = srp_reset_host,
1627 .can_queue = SRP_SQ_SIZE,
1628 .this_id = -1,
1629 .cmd_per_lun = SRP_SQ_SIZE,
1630 .use_clustering = ENABLE_CLUSTERING,
1631 .shost_attrs = srp_host_attrs
1632 };
1633
1634 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1635 {
1636 struct srp_rport_identifiers ids;
1637 struct srp_rport *rport;
1638
1639 sprintf(target->target_name, "SRP.T10:%016llX",
1640 (unsigned long long) be64_to_cpu(target->id_ext));
1641
1642 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1643 return -ENODEV;
1644
1645 memcpy(ids.port_id, &target->id_ext, 8);
1646 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1647 ids.roles = SRP_RPORT_ROLE_TARGET;
1648 rport = srp_rport_add(target->scsi_host, &ids);
1649 if (IS_ERR(rport)) {
1650 scsi_remove_host(target->scsi_host);
1651 return PTR_ERR(rport);
1652 }
1653
1654 spin_lock(&host->target_lock);
1655 list_add_tail(&target->list, &host->target_list);
1656 spin_unlock(&host->target_lock);
1657
1658 target->state = SRP_TARGET_LIVE;
1659
1660 scsi_scan_target(&target->scsi_host->shost_gendev,
1661 0, target->scsi_id, SCAN_WILD_CARD, 0);
1662
1663 return 0;
1664 }
1665
1666 static void srp_release_dev(struct device *dev)
1667 {
1668 struct srp_host *host =
1669 container_of(dev, struct srp_host, dev);
1670
1671 complete(&host->released);
1672 }
1673
1674 static struct class srp_class = {
1675 .name = "infiniband_srp",
1676 .dev_release = srp_release_dev
1677 };
1678
1679 /*
1680 * Target ports are added by writing
1681 *
1682 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1683 * pkey=<P_Key>,service_id=<service ID>
1684 *
1685 * to the add_target sysfs attribute.
1686 */
1687 enum {
1688 SRP_OPT_ERR = 0,
1689 SRP_OPT_ID_EXT = 1 << 0,
1690 SRP_OPT_IOC_GUID = 1 << 1,
1691 SRP_OPT_DGID = 1 << 2,
1692 SRP_OPT_PKEY = 1 << 3,
1693 SRP_OPT_SERVICE_ID = 1 << 4,
1694 SRP_OPT_MAX_SECT = 1 << 5,
1695 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1696 SRP_OPT_IO_CLASS = 1 << 7,
1697 SRP_OPT_INITIATOR_EXT = 1 << 8,
1698 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1699 SRP_OPT_IOC_GUID |
1700 SRP_OPT_DGID |
1701 SRP_OPT_PKEY |
1702 SRP_OPT_SERVICE_ID),
1703 };
1704
1705 static const match_table_t srp_opt_tokens = {
1706 { SRP_OPT_ID_EXT, "id_ext=%s" },
1707 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1708 { SRP_OPT_DGID, "dgid=%s" },
1709 { SRP_OPT_PKEY, "pkey=%x" },
1710 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1711 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1712 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1713 { SRP_OPT_IO_CLASS, "io_class=%x" },
1714 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1715 { SRP_OPT_ERR, NULL }
1716 };
1717
1718 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1719 {
1720 char *options, *sep_opt;
1721 char *p;
1722 char dgid[3];
1723 substring_t args[MAX_OPT_ARGS];
1724 int opt_mask = 0;
1725 int token;
1726 int ret = -EINVAL;
1727 int i;
1728
1729 options = kstrdup(buf, GFP_KERNEL);
1730 if (!options)
1731 return -ENOMEM;
1732
1733 sep_opt = options;
1734 while ((p = strsep(&sep_opt, ",")) != NULL) {
1735 if (!*p)
1736 continue;
1737
1738 token = match_token(p, srp_opt_tokens, args);
1739 opt_mask |= token;
1740
1741 switch (token) {
1742 case SRP_OPT_ID_EXT:
1743 p = match_strdup(args);
1744 if (!p) {
1745 ret = -ENOMEM;
1746 goto out;
1747 }
1748 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1749 kfree(p);
1750 break;
1751
1752 case SRP_OPT_IOC_GUID:
1753 p = match_strdup(args);
1754 if (!p) {
1755 ret = -ENOMEM;
1756 goto out;
1757 }
1758 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1759 kfree(p);
1760 break;
1761
1762 case SRP_OPT_DGID:
1763 p = match_strdup(args);
1764 if (!p) {
1765 ret = -ENOMEM;
1766 goto out;
1767 }
1768 if (strlen(p) != 32) {
1769 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1770 kfree(p);
1771 goto out;
1772 }
1773
1774 for (i = 0; i < 16; ++i) {
1775 strlcpy(dgid, p + i * 2, 3);
1776 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1777 }
1778 kfree(p);
1779 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1780 break;
1781
1782 case SRP_OPT_PKEY:
1783 if (match_hex(args, &token)) {
1784 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1785 goto out;
1786 }
1787 target->path.pkey = cpu_to_be16(token);
1788 break;
1789
1790 case SRP_OPT_SERVICE_ID:
1791 p = match_strdup(args);
1792 if (!p) {
1793 ret = -ENOMEM;
1794 goto out;
1795 }
1796 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1797 target->path.service_id = target->service_id;
1798 kfree(p);
1799 break;
1800
1801 case SRP_OPT_MAX_SECT:
1802 if (match_int(args, &token)) {
1803 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1804 goto out;
1805 }
1806 target->scsi_host->max_sectors = token;
1807 break;
1808
1809 case SRP_OPT_MAX_CMD_PER_LUN:
1810 if (match_int(args, &token)) {
1811 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1812 goto out;
1813 }
1814 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1815 break;
1816
1817 case SRP_OPT_IO_CLASS:
1818 if (match_hex(args, &token)) {
1819 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1820 goto out;
1821 }
1822 if (token != SRP_REV10_IB_IO_CLASS &&
1823 token != SRP_REV16A_IB_IO_CLASS) {
1824 printk(KERN_WARNING PFX "unknown IO class parameter value"
1825 " %x specified (use %x or %x).\n",
1826 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1827 goto out;
1828 }
1829 target->io_class = token;
1830 break;
1831
1832 case SRP_OPT_INITIATOR_EXT:
1833 p = match_strdup(args);
1834 if (!p) {
1835 ret = -ENOMEM;
1836 goto out;
1837 }
1838 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1839 kfree(p);
1840 break;
1841
1842 default:
1843 printk(KERN_WARNING PFX "unknown parameter or missing value "
1844 "'%s' in target creation request\n", p);
1845 goto out;
1846 }
1847 }
1848
1849 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1850 ret = 0;
1851 else
1852 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1853 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1854 !(srp_opt_tokens[i].token & opt_mask))
1855 printk(KERN_WARNING PFX "target creation request is "
1856 "missing parameter '%s'\n",
1857 srp_opt_tokens[i].pattern);
1858
1859 out:
1860 kfree(options);
1861 return ret;
1862 }
1863
1864 static ssize_t srp_create_target(struct device *dev,
1865 struct device_attribute *attr,
1866 const char *buf, size_t count)
1867 {
1868 struct srp_host *host =
1869 container_of(dev, struct srp_host, dev);
1870 struct Scsi_Host *target_host;
1871 struct srp_target_port *target;
1872 int ret;
1873 int i;
1874
1875 target_host = scsi_host_alloc(&srp_template,
1876 sizeof (struct srp_target_port));
1877 if (!target_host)
1878 return -ENOMEM;
1879
1880 target_host->transportt = ib_srp_transport_template;
1881 target_host->max_lun = SRP_MAX_LUN;
1882 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1883
1884 target = host_to_target(target_host);
1885
1886 target->io_class = SRP_REV16A_IB_IO_CLASS;
1887 target->scsi_host = target_host;
1888 target->srp_host = host;
1889
1890 INIT_LIST_HEAD(&target->free_reqs);
1891 INIT_LIST_HEAD(&target->req_queue);
1892 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1893 target->req_ring[i].index = i;
1894 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1895 }
1896
1897 ret = srp_parse_options(buf, target);
1898 if (ret)
1899 goto err;
1900
1901 ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1902
1903 shost_printk(KERN_DEBUG, target->scsi_host, PFX
1904 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1905 "service_id %016llx dgid %pI6\n",
1906 (unsigned long long) be64_to_cpu(target->id_ext),
1907 (unsigned long long) be64_to_cpu(target->ioc_guid),
1908 be16_to_cpu(target->path.pkey),
1909 (unsigned long long) be64_to_cpu(target->service_id),
1910 target->path.dgid.raw);
1911
1912 ret = srp_create_target_ib(target);
1913 if (ret)
1914 goto err;
1915
1916 ret = srp_new_cm_id(target);
1917 if (ret)
1918 goto err_free;
1919
1920 target->qp_in_error = 0;
1921 ret = srp_connect_target(target);
1922 if (ret) {
1923 shost_printk(KERN_ERR, target->scsi_host,
1924 PFX "Connection failed\n");
1925 goto err_cm_id;
1926 }
1927
1928 ret = srp_add_target(host, target);
1929 if (ret)
1930 goto err_disconnect;
1931
1932 return count;
1933
1934 err_disconnect:
1935 srp_disconnect_target(target);
1936
1937 err_cm_id:
1938 ib_destroy_cm_id(target->cm_id);
1939
1940 err_free:
1941 srp_free_target_ib(target);
1942
1943 err:
1944 scsi_host_put(target_host);
1945
1946 return ret;
1947 }
1948
1949 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1950
1951 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1952 char *buf)
1953 {
1954 struct srp_host *host = container_of(dev, struct srp_host, dev);
1955
1956 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
1957 }
1958
1959 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1960
1961 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1962 char *buf)
1963 {
1964 struct srp_host *host = container_of(dev, struct srp_host, dev);
1965
1966 return sprintf(buf, "%d\n", host->port);
1967 }
1968
1969 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1970
1971 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1972 {
1973 struct srp_host *host;
1974
1975 host = kzalloc(sizeof *host, GFP_KERNEL);
1976 if (!host)
1977 return NULL;
1978
1979 INIT_LIST_HEAD(&host->target_list);
1980 spin_lock_init(&host->target_lock);
1981 init_completion(&host->released);
1982 host->srp_dev = device;
1983 host->port = port;
1984
1985 host->dev.class = &srp_class;
1986 host->dev.parent = device->dev->dma_device;
1987 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
1988
1989 if (device_register(&host->dev))
1990 goto free_host;
1991 if (device_create_file(&host->dev, &dev_attr_add_target))
1992 goto err_class;
1993 if (device_create_file(&host->dev, &dev_attr_ibdev))
1994 goto err_class;
1995 if (device_create_file(&host->dev, &dev_attr_port))
1996 goto err_class;
1997
1998 return host;
1999
2000 err_class:
2001 device_unregister(&host->dev);
2002
2003 free_host:
2004 kfree(host);
2005
2006 return NULL;
2007 }
2008
2009 static void srp_add_one(struct ib_device *device)
2010 {
2011 struct srp_device *srp_dev;
2012 struct ib_device_attr *dev_attr;
2013 struct ib_fmr_pool_param fmr_param;
2014 struct srp_host *host;
2015 int s, e, p;
2016
2017 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2018 if (!dev_attr)
2019 return;
2020
2021 if (ib_query_device(device, dev_attr)) {
2022 printk(KERN_WARNING PFX "Query device failed for %s\n",
2023 device->name);
2024 goto free_attr;
2025 }
2026
2027 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2028 if (!srp_dev)
2029 goto free_attr;
2030
2031 /*
2032 * Use the smallest page size supported by the HCA, down to a
2033 * minimum of 512 bytes (which is the smallest sector that a
2034 * SCSI command will ever carry).
2035 */
2036 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2037 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
2038 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2039
2040 INIT_LIST_HEAD(&srp_dev->dev_list);
2041
2042 srp_dev->dev = device;
2043 srp_dev->pd = ib_alloc_pd(device);
2044 if (IS_ERR(srp_dev->pd))
2045 goto free_dev;
2046
2047 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2048 IB_ACCESS_LOCAL_WRITE |
2049 IB_ACCESS_REMOTE_READ |
2050 IB_ACCESS_REMOTE_WRITE);
2051 if (IS_ERR(srp_dev->mr))
2052 goto err_pd;
2053
2054 memset(&fmr_param, 0, sizeof fmr_param);
2055 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2056 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2057 fmr_param.cache = 1;
2058 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2059 fmr_param.page_shift = srp_dev->fmr_page_shift;
2060 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2061 IB_ACCESS_REMOTE_WRITE |
2062 IB_ACCESS_REMOTE_READ);
2063
2064 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2065 if (IS_ERR(srp_dev->fmr_pool))
2066 srp_dev->fmr_pool = NULL;
2067
2068 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2069 s = 0;
2070 e = 0;
2071 } else {
2072 s = 1;
2073 e = device->phys_port_cnt;
2074 }
2075
2076 for (p = s; p <= e; ++p) {
2077 host = srp_add_port(srp_dev, p);
2078 if (host)
2079 list_add_tail(&host->list, &srp_dev->dev_list);
2080 }
2081
2082 ib_set_client_data(device, &srp_client, srp_dev);
2083
2084 goto free_attr;
2085
2086 err_pd:
2087 ib_dealloc_pd(srp_dev->pd);
2088
2089 free_dev:
2090 kfree(srp_dev);
2091
2092 free_attr:
2093 kfree(dev_attr);
2094 }
2095
2096 static void srp_remove_one(struct ib_device *device)
2097 {
2098 struct srp_device *srp_dev;
2099 struct srp_host *host, *tmp_host;
2100 LIST_HEAD(target_list);
2101 struct srp_target_port *target, *tmp_target;
2102
2103 srp_dev = ib_get_client_data(device, &srp_client);
2104
2105 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2106 device_unregister(&host->dev);
2107 /*
2108 * Wait for the sysfs entry to go away, so that no new
2109 * target ports can be created.
2110 */
2111 wait_for_completion(&host->released);
2112
2113 /*
2114 * Mark all target ports as removed, so we stop queueing
2115 * commands and don't try to reconnect.
2116 */
2117 spin_lock(&host->target_lock);
2118 list_for_each_entry(target, &host->target_list, list) {
2119 spin_lock_irq(target->scsi_host->host_lock);
2120 target->state = SRP_TARGET_REMOVED;
2121 spin_unlock_irq(target->scsi_host->host_lock);
2122 }
2123 spin_unlock(&host->target_lock);
2124
2125 /*
2126 * Wait for any reconnection tasks that may have
2127 * started before we marked our target ports as
2128 * removed, and any target port removal tasks.
2129 */
2130 flush_scheduled_work();
2131
2132 list_for_each_entry_safe(target, tmp_target,
2133 &host->target_list, list) {
2134 srp_remove_host(target->scsi_host);
2135 scsi_remove_host(target->scsi_host);
2136 srp_disconnect_target(target);
2137 ib_destroy_cm_id(target->cm_id);
2138 srp_free_target_ib(target);
2139 scsi_host_put(target->scsi_host);
2140 }
2141
2142 kfree(host);
2143 }
2144
2145 if (srp_dev->fmr_pool)
2146 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2147 ib_dereg_mr(srp_dev->mr);
2148 ib_dealloc_pd(srp_dev->pd);
2149
2150 kfree(srp_dev);
2151 }
2152
2153 static struct srp_function_template ib_srp_transport_functions = {
2154 };
2155
2156 static int __init srp_init_module(void)
2157 {
2158 int ret;
2159
2160 if (srp_sg_tablesize > 255) {
2161 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2162 srp_sg_tablesize = 255;
2163 }
2164
2165 ib_srp_transport_template =
2166 srp_attach_transport(&ib_srp_transport_functions);
2167 if (!ib_srp_transport_template)
2168 return -ENOMEM;
2169
2170 srp_template.sg_tablesize = srp_sg_tablesize;
2171 srp_max_iu_len = (sizeof (struct srp_cmd) +
2172 sizeof (struct srp_indirect_buf) +
2173 srp_sg_tablesize * 16);
2174
2175 ret = class_register(&srp_class);
2176 if (ret) {
2177 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2178 srp_release_transport(ib_srp_transport_template);
2179 return ret;
2180 }
2181
2182 ib_sa_register_client(&srp_sa_client);
2183
2184 ret = ib_register_client(&srp_client);
2185 if (ret) {
2186 printk(KERN_ERR PFX "couldn't register IB client\n");
2187 srp_release_transport(ib_srp_transport_template);
2188 ib_sa_unregister_client(&srp_sa_client);
2189 class_unregister(&srp_class);
2190 return ret;
2191 }
2192
2193 return 0;
2194 }
2195
2196 static void __exit srp_cleanup_module(void)
2197 {
2198 ib_unregister_client(&srp_client);
2199 ib_sa_unregister_client(&srp_sa_client);
2200 class_unregister(&srp_class);
2201 srp_release_transport(ib_srp_transport_template);
2202 }
2203
2204 module_init(srp_init_module);
2205 module_exit(srp_cleanup_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree