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RT-AC56 3.0.0.4.374.37 core
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / infiniband / ulp / srp / ib_srp.c
blobca894ce9f01827b3e54d5fa30dc51fb869344b55
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
434 init_completion(&target->done);
435 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
436 shost_printk(KERN_DEBUG, target->scsi_host,
437 PFX "Sending CM DREQ failed\n");
438 return;
439 }
440 wait_for_completion(&target->done);
441 }
442
443 static void srp_remove_work(struct work_struct *work)
444 {
445 struct srp_target_port *target =
446 container_of(work, struct srp_target_port, work);
447
448 spin_lock_irq(target->scsi_host->host_lock);
449 if (target->state != SRP_TARGET_DEAD) {
450 spin_unlock_irq(target->scsi_host->host_lock);
451 return;
452 }
453 target->state = SRP_TARGET_REMOVED;
454 spin_unlock_irq(target->scsi_host->host_lock);
455
456 spin_lock(&target->srp_host->target_lock);
457 list_del(&target->list);
458 spin_unlock(&target->srp_host->target_lock);
459
460 srp_remove_host(target->scsi_host);
461 scsi_remove_host(target->scsi_host);
462 ib_destroy_cm_id(target->cm_id);
463 srp_free_target_ib(target);
464 scsi_host_put(target->scsi_host);
465 }
466
467 static int srp_connect_target(struct srp_target_port *target)
468 {
469 int retries = 3;
470 int ret;
471
472 ret = srp_lookup_path(target);
473 if (ret)
474 return ret;
475
476 while (1) {
477 init_completion(&target->done);
478 ret = srp_send_req(target);
479 if (ret)
480 return ret;
481 wait_for_completion(&target->done);
482
483 /*
484 * The CM event handling code will set status to
485 * SRP_PORT_REDIRECT if we get a port redirect REJ
486 * back, or SRP_DLID_REDIRECT if we get a lid/qp
487 * redirect REJ back.
488 */
489 switch (target->status) {
490 case 0:
491 return 0;
492
493 case SRP_PORT_REDIRECT:
494 ret = srp_lookup_path(target);
495 if (ret)
496 return ret;
497 break;
498
499 case SRP_DLID_REDIRECT:
500 break;
501
502 case SRP_STALE_CONN:
503 /* Our current CM id was stale, and is now in timewait.
504 * Try to reconnect with a new one.
505 */
506 if (!retries-- || srp_new_cm_id(target)) {
507 shost_printk(KERN_ERR, target->scsi_host, PFX
508 "giving up on stale connection\n");
509 target->status = -ECONNRESET;
510 return target->status;
511 }
512
513 shost_printk(KERN_ERR, target->scsi_host, PFX
514 "retrying stale connection\n");
515 break;
516
517 default:
518 return target->status;
519 }
520 }
521 }
522
523 static void srp_unmap_data(struct scsi_cmnd *scmnd,
524 struct srp_target_port *target,
525 struct srp_request *req)
526 {
527 if (!scsi_sglist(scmnd) ||
528 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
529 scmnd->sc_data_direction != DMA_FROM_DEVICE))
530 return;
531
532 if (req->fmr) {
533 ib_fmr_pool_unmap(req->fmr);
534 req->fmr = NULL;
535 }
536
537 ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
538 scsi_sg_count(scmnd), scmnd->sc_data_direction);
539 }
540
541 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
542 {
543 srp_unmap_data(req->scmnd, target, req);
544 list_move_tail(&req->list, &target->free_reqs);
545 }
546
547 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
548 {
549 req->scmnd->result = DID_RESET << 16;
550 req->scmnd->scsi_done(req->scmnd);
551 srp_remove_req(target, req);
552 }
553
554 static int srp_reconnect_target(struct srp_target_port *target)
555 {
556 struct ib_qp_attr qp_attr;
557 struct srp_request *req, *tmp;
558 struct ib_wc wc;
559 int ret;
560
561 spin_lock_irq(target->scsi_host->host_lock);
562 if (target->state != SRP_TARGET_LIVE) {
563 spin_unlock_irq(target->scsi_host->host_lock);
564 return -EAGAIN;
565 }
566 target->state = SRP_TARGET_CONNECTING;
567 spin_unlock_irq(target->scsi_host->host_lock);
568
569 srp_disconnect_target(target);
570 /*
571 * Now get a new local CM ID so that we avoid confusing the
572 * target in case things are really fouled up.
573 */
574 ret = srp_new_cm_id(target);
575 if (ret)
576 goto err;
577
578 qp_attr.qp_state = IB_QPS_RESET;
579 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
580 if (ret)
581 goto err;
582
583 ret = srp_init_qp(target, target->qp);
584 if (ret)
585 goto err;
586
587 while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
588 ; /* nothing */
589 while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
590 ; /* nothing */
591
592 spin_lock_irq(target->scsi_host->host_lock);
593 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
594 srp_reset_req(target, req);
595 spin_unlock_irq(target->scsi_host->host_lock);
596
597 target->rx_head = 0;
598 target->tx_head = 0;
599 target->tx_tail = 0;
600
601 target->qp_in_error = 0;
602 ret = srp_connect_target(target);
603 if (ret)
604 goto err;
605
606 spin_lock_irq(target->scsi_host->host_lock);
607 if (target->state == SRP_TARGET_CONNECTING) {
608 ret = 0;
609 target->state = SRP_TARGET_LIVE;
610 } else
611 ret = -EAGAIN;
612 spin_unlock_irq(target->scsi_host->host_lock);
613
614 return ret;
615
616 err:
617 shost_printk(KERN_ERR, target->scsi_host,
618 PFX "reconnect failed (%d), removing target port.\n", ret);
619
620 /*
621 * We couldn't reconnect, so kill our target port off.
622 * However, we have to defer the real removal because we might
623 * be in the context of the SCSI error handler now, which
624 * would deadlock if we call scsi_remove_host().
625 */
626 spin_lock_irq(target->scsi_host->host_lock);
627 if (target->state == SRP_TARGET_CONNECTING) {
628 target->state = SRP_TARGET_DEAD;
629 INIT_WORK(&target->work, srp_remove_work);
630 schedule_work(&target->work);
631 }
632 spin_unlock_irq(target->scsi_host->host_lock);
633
634 return ret;
635 }
636
637 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
638 int sg_cnt, struct srp_request *req,
639 struct srp_direct_buf *buf)
640 {
641 u64 io_addr = 0;
642 u64 *dma_pages;
643 u32 len;
644 int page_cnt;
645 int i, j;
646 int ret;
647 struct srp_device *dev = target->srp_host->srp_dev;
648 struct ib_device *ibdev = dev->dev;
649 struct scatterlist *sg;
650
651 if (!dev->fmr_pool)
652 return -ENODEV;
653
654 if (srp_target_is_mellanox(target) &&
655 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
656 return -EINVAL;
657
658 len = page_cnt = 0;
659 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
660 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
661
662 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
663 if (i > 0)
664 return -EINVAL;
665 else
666 ++page_cnt;
667 }
668 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
669 ~dev->fmr_page_mask) {
670 if (i < sg_cnt - 1)
671 return -EINVAL;
672 else
673 ++page_cnt;
674 }
675
676 len += dma_len;
677 }
678
679 page_cnt += len >> dev->fmr_page_shift;
680 if (page_cnt > SRP_FMR_SIZE)
681 return -ENOMEM;
682
683 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
684 if (!dma_pages)
685 return -ENOMEM;
686
687 page_cnt = 0;
688 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
689 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
690
691 for (j = 0; j < dma_len; j += dev->fmr_page_size)
692 dma_pages[page_cnt++] =
693 (ib_sg_dma_address(ibdev, sg) &
694 dev->fmr_page_mask) + j;
695 }
696
697 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
698 dma_pages, page_cnt, io_addr);
699 if (IS_ERR(req->fmr)) {
700 ret = PTR_ERR(req->fmr);
701 req->fmr = NULL;
702 goto out;
703 }
704
705 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
706 ~dev->fmr_page_mask);
707 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
708 buf->len = cpu_to_be32(len);
709
710 ret = 0;
711
712 out:
713 kfree(dma_pages);
714
715 return ret;
716 }
717
718 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
719 struct srp_request *req)
720 {
721 struct scatterlist *scat;
722 struct srp_cmd *cmd = req->cmd->buf;
723 int len, nents, count;
724 u8 fmt = SRP_DATA_DESC_DIRECT;
725 struct srp_device *dev;
726 struct ib_device *ibdev;
727
728 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
729 return sizeof (struct srp_cmd);
730
731 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
732 scmnd->sc_data_direction != DMA_TO_DEVICE) {
733 shost_printk(KERN_WARNING, target->scsi_host,
734 PFX "Unhandled data direction %d\n",
735 scmnd->sc_data_direction);
736 return -EINVAL;
737 }
738
739 nents = scsi_sg_count(scmnd);
740 scat = scsi_sglist(scmnd);
741
742 dev = target->srp_host->srp_dev;
743 ibdev = dev->dev;
744
745 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
746
747 fmt = SRP_DATA_DESC_DIRECT;
748 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
749
750 if (count == 1) {
751 /*
752 * The midlayer only generated a single gather/scatter
753 * entry, or DMA mapping coalesced everything to a
754 * single entry. So a direct descriptor along with
755 * the DMA MR suffices.
756 */
757 struct srp_direct_buf *buf = (void *) cmd->add_data;
758
759 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
760 buf->key = cpu_to_be32(dev->mr->rkey);
761 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
762 } else if (srp_map_fmr(target, scat, count, req,
763 (void *) cmd->add_data)) {
764 /*
765 * FMR mapping failed, and the scatterlist has more
766 * than one entry. Generate an indirect memory
767 * descriptor.
768 */
769 struct srp_indirect_buf *buf = (void *) cmd->add_data;
770 struct scatterlist *sg;
771 u32 datalen = 0;
772 int i;
773
774 fmt = SRP_DATA_DESC_INDIRECT;
775 len = sizeof (struct srp_cmd) +
776 sizeof (struct srp_indirect_buf) +
777 count * sizeof (struct srp_direct_buf);
778
779 scsi_for_each_sg(scmnd, sg, count, i) {
780 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
781
782 buf->desc_list[i].va =
783 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
784 buf->desc_list[i].key =
785 cpu_to_be32(dev->mr->rkey);
786 buf->desc_list[i].len = cpu_to_be32(dma_len);
787 datalen += dma_len;
788 }
789
790 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
791 cmd->data_out_desc_cnt = count;
792 else
793 cmd->data_in_desc_cnt = count;
794
795 buf->table_desc.va =
796 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
797 buf->table_desc.key =
798 cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
799 buf->table_desc.len =
800 cpu_to_be32(count * sizeof (struct srp_direct_buf));
801
802 buf->len = cpu_to_be32(datalen);
803 }
804
805 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
806 cmd->buf_fmt = fmt << 4;
807 else
808 cmd->buf_fmt = fmt;
809
810 return len;
811 }
812
813 static int srp_post_recv(struct srp_target_port *target)
814 {
815 unsigned long flags;
816 struct srp_iu *iu;
817 struct ib_sge list;
818 struct ib_recv_wr wr, *bad_wr;
819 unsigned int next;
820 int ret;
821
822 spin_lock_irqsave(target->scsi_host->host_lock, flags);
823
824 next = target->rx_head & (SRP_RQ_SIZE - 1);
825 wr.wr_id = next;
826 iu = target->rx_ring[next];
827
828 list.addr = iu->dma;
829 list.length = iu->size;
830 list.lkey = target->srp_host->srp_dev->mr->lkey;
831
832 wr.next = NULL;
833 wr.sg_list = &list;
834 wr.num_sge = 1;
835
836 ret = ib_post_recv(target->qp, &wr, &bad_wr);
837 if (!ret)
838 ++target->rx_head;
839
840 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
841
842 return ret;
843 }
844
845 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
846 {
847 struct srp_request *req;
848 struct scsi_cmnd *scmnd;
849 unsigned long flags;
850 s32 delta;
851
852 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
853
854 spin_lock_irqsave(target->scsi_host->host_lock, flags);
855
856 target->req_lim += delta;
857
858 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
859
860 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
861 if (be32_to_cpu(rsp->resp_data_len) < 4)
862 req->tsk_status = -1;
863 else
864 req->tsk_status = rsp->data[3];
865 complete(&req->done);
866 } else {
867 scmnd = req->scmnd;
868 if (!scmnd)
869 shost_printk(KERN_ERR, target->scsi_host,
870 "Null scmnd for RSP w/tag %016llx\n",
871 (unsigned long long) rsp->tag);
872 scmnd->result = rsp->status;
873
874 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
875 memcpy(scmnd->sense_buffer, rsp->data +
876 be32_to_cpu(rsp->resp_data_len),
877 min_t(int, be32_to_cpu(rsp->sense_data_len),
878 SCSI_SENSE_BUFFERSIZE));
879 }
880
881 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
882 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
883 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
884 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
885
886 if (!req->tsk_mgmt) {
887 scmnd->host_scribble = (void *) -1L;
888 scmnd->scsi_done(scmnd);
889
890 srp_remove_req(target, req);
891 } else
892 req->cmd_done = 1;
893 }
894
895 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
896 }
897
898 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
899 {
900 struct ib_device *dev;
901 struct srp_iu *iu;
902 int res;
903 u8 opcode;
904
905 iu = target->rx_ring[wc->wr_id];
906
907 dev = target->srp_host->srp_dev->dev;
908 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
909 DMA_FROM_DEVICE);
910
911 opcode = *(u8 *) iu->buf;
912
913 if (0) {
914 shost_printk(KERN_ERR, target->scsi_host,
915 PFX "recv completion, opcode 0x%02x\n", opcode);
916 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
917 iu->buf, wc->byte_len, true);
918 }
919
920 switch (opcode) {
921 case SRP_RSP:
922 srp_process_rsp(target, iu->buf);
923 break;
924
925 case SRP_T_LOGOUT:
926 shost_printk(KERN_WARNING, target->scsi_host,
927 PFX "Got target logout request\n");
928 break;
929
930 default:
931 shost_printk(KERN_WARNING, target->scsi_host,
932 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
933 break;
934 }
935
936 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
937 DMA_FROM_DEVICE);
938
939 res = srp_post_recv(target);
940 if (res != 0)
941 shost_printk(KERN_ERR, target->scsi_host,
942 PFX "Recv failed with error code %d\n", res);
943 }
944
945 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
946 {
947 struct srp_target_port *target = target_ptr;
948 struct ib_wc wc;
949
950 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
951 while (ib_poll_cq(cq, 1, &wc) > 0) {
952 if (wc.status) {
953 shost_printk(KERN_ERR, target->scsi_host,
954 PFX "failed receive status %d\n",
955 wc.status);
956 target->qp_in_error = 1;
957 break;
958 }
959
960 srp_handle_recv(target, &wc);
961 }
962 }
963
964 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
965 {
966 struct srp_target_port *target = target_ptr;
967 struct ib_wc wc;
968
969 while (ib_poll_cq(cq, 1, &wc) > 0) {
970 if (wc.status) {
971 shost_printk(KERN_ERR, target->scsi_host,
972 PFX "failed send status %d\n",
973 wc.status);
974 target->qp_in_error = 1;
975 break;
976 }
977
978 ++target->tx_tail;
979 }
980 }
981
982 /*
983 * Must be called with target->scsi_host->host_lock held to protect
984 * req_lim and tx_head. Lock cannot be dropped between call here and
985 * call to __srp_post_send().
986 */
987 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
988 enum srp_request_type req_type)
989 {
990 s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
991
992 srp_send_completion(target->send_cq, target);
993
994 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
995 return NULL;
996
997 if (target->req_lim < min) {
998 ++target->zero_req_lim;
999 return NULL;
1000 }
1001
1002 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
1003 }
1004
1005 /*
1006 * Must be called with target->scsi_host->host_lock held to protect
1007 * req_lim and tx_head.
1008 */
1009 static int __srp_post_send(struct srp_target_port *target,
1010 struct srp_iu *iu, int len)
1011 {
1012 struct ib_sge list;
1013 struct ib_send_wr wr, *bad_wr;
1014 int ret = 0;
1015
1016 list.addr = iu->dma;
1017 list.length = len;
1018 list.lkey = target->srp_host->srp_dev->mr->lkey;
1019
1020 wr.next = NULL;
1021 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
1022 wr.sg_list = &list;
1023 wr.num_sge = 1;
1024 wr.opcode = IB_WR_SEND;
1025 wr.send_flags = IB_SEND_SIGNALED;
1026
1027 ret = ib_post_send(target->qp, &wr, &bad_wr);
1028
1029 if (!ret) {
1030 ++target->tx_head;
1031 --target->req_lim;
1032 }
1033
1034 return ret;
1035 }
1036
1037 static int srp_queuecommand(struct scsi_cmnd *scmnd,
1038 void (*done)(struct scsi_cmnd *))
1039 {
1040 struct srp_target_port *target = host_to_target(scmnd->device->host);
1041 struct srp_request *req;
1042 struct srp_iu *iu;
1043 struct srp_cmd *cmd;
1044 struct ib_device *dev;
1045 int len;
1046
1047 if (target->state == SRP_TARGET_CONNECTING)
1048 goto err;
1049
1050 if (target->state == SRP_TARGET_DEAD ||
1051 target->state == SRP_TARGET_REMOVED) {
1052 scmnd->result = DID_BAD_TARGET << 16;
1053 done(scmnd);
1054 return 0;
1055 }
1056
1057 iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1058 if (!iu)
1059 goto err;
1060
1061 dev = target->srp_host->srp_dev->dev;
1062 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1063 DMA_TO_DEVICE);
1064
1065 req = list_entry(target->free_reqs.next, struct srp_request, list);
1066
1067 scmnd->scsi_done = done;
1068 scmnd->result = 0;
1069 scmnd->host_scribble = (void *) (long) req->index;
1070
1071 cmd = iu->buf;
1072 memset(cmd, 0, sizeof *cmd);
1073
1074 cmd->opcode = SRP_CMD;
1075 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1076 cmd->tag = req->index;
1077 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1078
1079 req->scmnd = scmnd;
1080 req->cmd = iu;
1081 req->cmd_done = 0;
1082 req->tsk_mgmt = NULL;
1083
1084 len = srp_map_data(scmnd, target, req);
1085 if (len < 0) {
1086 shost_printk(KERN_ERR, target->scsi_host,
1087 PFX "Failed to map data\n");
1088 goto err;
1089 }
1090
1091 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1092 DMA_TO_DEVICE);
1093
1094 if (__srp_post_send(target, iu, len)) {
1095 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1096 goto err_unmap;
1097 }
1098
1099 list_move_tail(&req->list, &target->req_queue);
1100
1101 return 0;
1102
1103 err_unmap:
1104 srp_unmap_data(scmnd, target, req);
1105
1106 err:
1107 return SCSI_MLQUEUE_HOST_BUSY;
1108 }
1109
1110 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1111 {
1112 int i;
1113
1114 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1115 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1116 target->max_ti_iu_len,
1117 GFP_KERNEL, DMA_FROM_DEVICE);
1118 if (!target->rx_ring[i])
1119 goto err;
1120 }
1121
1122 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1123 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1124 srp_max_iu_len,
1125 GFP_KERNEL, DMA_TO_DEVICE);
1126 if (!target->tx_ring[i])
1127 goto err;
1128 }
1129
1130 return 0;
1131
1132 err:
1133 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1134 srp_free_iu(target->srp_host, target->rx_ring[i]);
1135 target->rx_ring[i] = NULL;
1136 }
1137
1138 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1139 srp_free_iu(target->srp_host, target->tx_ring[i]);
1140 target->tx_ring[i] = NULL;
1141 }
1142
1143 return -ENOMEM;
1144 }
1145
1146 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1147 struct ib_cm_event *event,
1148 struct srp_target_port *target)
1149 {
1150 struct Scsi_Host *shost = target->scsi_host;
1151 struct ib_class_port_info *cpi;
1152 int opcode;
1153
1154 switch (event->param.rej_rcvd.reason) {
1155 case IB_CM_REJ_PORT_CM_REDIRECT:
1156 cpi = event->param.rej_rcvd.ari;
1157 target->path.dlid = cpi->redirect_lid;
1158 target->path.pkey = cpi->redirect_pkey;
1159 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1160 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1161
1162 target->status = target->path.dlid ?
1163 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1164 break;
1165
1166 case IB_CM_REJ_PORT_REDIRECT:
1167 if (srp_target_is_topspin(target)) {
1168 /*
1169 * Topspin/Cisco SRP gateways incorrectly send
1170 * reject reason code 25 when they mean 24
1171 * (port redirect).
1172 */
1173 memcpy(target->path.dgid.raw,
1174 event->param.rej_rcvd.ari, 16);
1175
1176 shost_printk(KERN_DEBUG, shost,
1177 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1178 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1179 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1180
1181 target->status = SRP_PORT_REDIRECT;
1182 } else {
1183 shost_printk(KERN_WARNING, shost,
1184 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1185 target->status = -ECONNRESET;
1186 }
1187 break;
1188
1189 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1190 shost_printk(KERN_WARNING, shost,
1191 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1192 target->status = -ECONNRESET;
1193 break;
1194
1195 case IB_CM_REJ_CONSUMER_DEFINED:
1196 opcode = *(u8 *) event->private_data;
1197 if (opcode == SRP_LOGIN_REJ) {
1198 struct srp_login_rej *rej = event->private_data;
1199 u32 reason = be32_to_cpu(rej->reason);
1200
1201 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1202 shost_printk(KERN_WARNING, shost,
1203 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1204 else
1205 shost_printk(KERN_WARNING, shost,
1206 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1207 } else
1208 shost_printk(KERN_WARNING, shost,
1209 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1210 " opcode 0x%02x\n", opcode);
1211 target->status = -ECONNRESET;
1212 break;
1213
1214 case IB_CM_REJ_STALE_CONN:
1215 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1216 target->status = SRP_STALE_CONN;
1217 break;
1218
1219 default:
1220 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1221 event->param.rej_rcvd.reason);
1222 target->status = -ECONNRESET;
1223 }
1224 }
1225
1226 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1227 {
1228 struct srp_target_port *target = cm_id->context;
1229 struct ib_qp_attr *qp_attr = NULL;
1230 int attr_mask = 0;
1231 int comp = 0;
1232 int opcode = 0;
1233 int i;
1234
1235 switch (event->event) {
1236 case IB_CM_REQ_ERROR:
1237 shost_printk(KERN_DEBUG, target->scsi_host,
1238 PFX "Sending CM REQ failed\n");
1239 comp = 1;
1240 target->status = -ECONNRESET;
1241 break;
1242
1243 case IB_CM_REP_RECEIVED:
1244 comp = 1;
1245 opcode = *(u8 *) event->private_data;
1246
1247 if (opcode == SRP_LOGIN_RSP) {
1248 struct srp_login_rsp *rsp = event->private_data;
1249
1250 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1251 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1252
1253 target->scsi_host->can_queue = min(target->req_lim,
1254 target->scsi_host->can_queue);
1255 } else {
1256 shost_printk(KERN_WARNING, target->scsi_host,
1257 PFX "Unhandled RSP opcode %#x\n", opcode);
1258 target->status = -ECONNRESET;
1259 break;
1260 }
1261
1262 if (!target->rx_ring[0]) {
1263 target->status = srp_alloc_iu_bufs(target);
1264 if (target->status)
1265 break;
1266 }
1267
1268 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1269 if (!qp_attr) {
1270 target->status = -ENOMEM;
1271 break;
1272 }
1273
1274 qp_attr->qp_state = IB_QPS_RTR;
1275 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1276 if (target->status)
1277 break;
1278
1279 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1280 if (target->status)
1281 break;
1282
1283 for (i = 0; i < SRP_RQ_SIZE; i++) {
1284 target->status = srp_post_recv(target);
1285 if (target->status)
1286 break;
1287 }
1288 if (target->status)
1289 break;
1290
1291 qp_attr->qp_state = IB_QPS_RTS;
1292 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1293 if (target->status)
1294 break;
1295
1296 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1297 if (target->status)
1298 break;
1299
1300 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1301 if (target->status)
1302 break;
1303
1304 break;
1305
1306 case IB_CM_REJ_RECEIVED:
1307 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1308 comp = 1;
1309
1310 srp_cm_rej_handler(cm_id, event, target);
1311 break;
1312
1313 case IB_CM_DREQ_RECEIVED:
1314 shost_printk(KERN_WARNING, target->scsi_host,
1315 PFX "DREQ received - connection closed\n");
1316 if (ib_send_cm_drep(cm_id, NULL, 0))
1317 shost_printk(KERN_ERR, target->scsi_host,
1318 PFX "Sending CM DREP failed\n");
1319 break;
1320
1321 case IB_CM_TIMEWAIT_EXIT:
1322 shost_printk(KERN_ERR, target->scsi_host,
1323 PFX "connection closed\n");
1324
1325 comp = 1;
1326 target->status = 0;
1327 break;
1328
1329 case IB_CM_MRA_RECEIVED:
1330 case IB_CM_DREQ_ERROR:
1331 case IB_CM_DREP_RECEIVED:
1332 break;
1333
1334 default:
1335 shost_printk(KERN_WARNING, target->scsi_host,
1336 PFX "Unhandled CM event %d\n", event->event);
1337 break;
1338 }
1339
1340 if (comp)
1341 complete(&target->done);
1342
1343 kfree(qp_attr);
1344
1345 return 0;
1346 }
1347
1348 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1349 struct srp_request *req, u8 func)
1350 {
1351 struct srp_iu *iu;
1352 struct srp_tsk_mgmt *tsk_mgmt;
1353
1354 spin_lock_irq(target->scsi_host->host_lock);
1355
1356 if (target->state == SRP_TARGET_DEAD ||
1357 target->state == SRP_TARGET_REMOVED) {
1358 req->scmnd->result = DID_BAD_TARGET << 16;
1359 goto out;
1360 }
1361
1362 init_completion(&req->done);
1363
1364 iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1365 if (!iu)
1366 goto out;
1367
1368 tsk_mgmt = iu->buf;
1369 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1370
1371 tsk_mgmt->opcode = SRP_TSK_MGMT;
1372 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1373 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1374 tsk_mgmt->tsk_mgmt_func = func;
1375 tsk_mgmt->task_tag = req->index;
1376
1377 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1378 goto out;
1379
1380 req->tsk_mgmt = iu;
1381
1382 spin_unlock_irq(target->scsi_host->host_lock);
1383
1384 if (!wait_for_completion_timeout(&req->done,
1385 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1386 return -1;
1387
1388 return 0;
1389
1390 out:
1391 spin_unlock_irq(target->scsi_host->host_lock);
1392 return -1;
1393 }
1394
1395 static int srp_find_req(struct srp_target_port *target,
1396 struct scsi_cmnd *scmnd,
1397 struct srp_request **req)
1398 {
1399 if (scmnd->host_scribble == (void *) -1L)
1400 return -1;
1401
1402 *req = &target->req_ring[(long) scmnd->host_scribble];
1403
1404 return 0;
1405 }
1406
1407 static int srp_abort(struct scsi_cmnd *scmnd)
1408 {
1409 struct srp_target_port *target = host_to_target(scmnd->device->host);
1410 struct srp_request *req;
1411 int ret = SUCCESS;
1412
1413 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1414
1415 if (target->qp_in_error)
1416 return FAILED;
1417 if (srp_find_req(target, scmnd, &req))
1418 return FAILED;
1419 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1420 return FAILED;
1421
1422 spin_lock_irq(target->scsi_host->host_lock);
1423
1424 if (req->cmd_done) {
1425 srp_remove_req(target, req);
1426 scmnd->scsi_done(scmnd);
1427 } else if (!req->tsk_status) {
1428 srp_remove_req(target, req);
1429 scmnd->result = DID_ABORT << 16;
1430 } else
1431 ret = FAILED;
1432
1433 spin_unlock_irq(target->scsi_host->host_lock);
1434
1435 return ret;
1436 }
1437
1438 static int srp_reset_device(struct scsi_cmnd *scmnd)
1439 {
1440 struct srp_target_port *target = host_to_target(scmnd->device->host);
1441 struct srp_request *req, *tmp;
1442
1443 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1444
1445 if (target->qp_in_error)
1446 return FAILED;
1447 if (srp_find_req(target, scmnd, &req))
1448 return FAILED;
1449 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1450 return FAILED;
1451 if (req->tsk_status)
1452 return FAILED;
1453
1454 spin_lock_irq(target->scsi_host->host_lock);
1455
1456 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1457 if (req->scmnd->device == scmnd->device)
1458 srp_reset_req(target, req);
1459
1460 spin_unlock_irq(target->scsi_host->host_lock);
1461
1462 return SUCCESS;
1463 }
1464
1465 static int srp_reset_host(struct scsi_cmnd *scmnd)
1466 {
1467 struct srp_target_port *target = host_to_target(scmnd->device->host);
1468 int ret = FAILED;
1469
1470 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1471
1472 if (!srp_reconnect_target(target))
1473 ret = SUCCESS;
1474
1475 return ret;
1476 }
1477
1478 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1479 char *buf)
1480 {
1481 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1482
1483 if (target->state == SRP_TARGET_DEAD ||
1484 target->state == SRP_TARGET_REMOVED)
1485 return -ENODEV;
1486
1487 return sprintf(buf, "0x%016llx\n",
1488 (unsigned long long) be64_to_cpu(target->id_ext));
1489 }
1490
1491 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1492 char *buf)
1493 {
1494 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1495
1496 if (target->state == SRP_TARGET_DEAD ||
1497 target->state == SRP_TARGET_REMOVED)
1498 return -ENODEV;
1499
1500 return sprintf(buf, "0x%016llx\n",
1501 (unsigned long long) be64_to_cpu(target->ioc_guid));
1502 }
1503
1504 static ssize_t show_service_id(struct device *dev,
1505 struct device_attribute *attr, char *buf)
1506 {
1507 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1508
1509 if (target->state == SRP_TARGET_DEAD ||
1510 target->state == SRP_TARGET_REMOVED)
1511 return -ENODEV;
1512
1513 return sprintf(buf, "0x%016llx\n",
1514 (unsigned long long) be64_to_cpu(target->service_id));
1515 }
1516
1517 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1518 char *buf)
1519 {
1520 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1521
1522 if (target->state == SRP_TARGET_DEAD ||
1523 target->state == SRP_TARGET_REMOVED)
1524 return -ENODEV;
1525
1526 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1527 }
1528
1529 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1530 char *buf)
1531 {
1532 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1533
1534 if (target->state == SRP_TARGET_DEAD ||
1535 target->state == SRP_TARGET_REMOVED)
1536 return -ENODEV;
1537
1538 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1539 }
1540
1541 static ssize_t show_orig_dgid(struct device *dev,
1542 struct device_attribute *attr, char *buf)
1543 {
1544 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1545
1546 if (target->state == SRP_TARGET_DEAD ||
1547 target->state == SRP_TARGET_REMOVED)
1548 return -ENODEV;
1549
1550 return sprintf(buf, "%pI6\n", target->orig_dgid);
1551 }
1552
1553 static ssize_t show_req_lim(struct device *dev,
1554 struct device_attribute *attr, char *buf)
1555 {
1556 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1557
1558 if (target->state == SRP_TARGET_DEAD ||
1559 target->state == SRP_TARGET_REMOVED)
1560 return -ENODEV;
1561
1562 return sprintf(buf, "%d\n", target->req_lim);
1563 }
1564
1565 static ssize_t show_zero_req_lim(struct device *dev,
1566 struct device_attribute *attr, char *buf)
1567 {
1568 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1569
1570 if (target->state == SRP_TARGET_DEAD ||
1571 target->state == SRP_TARGET_REMOVED)
1572 return -ENODEV;
1573
1574 return sprintf(buf, "%d\n", target->zero_req_lim);
1575 }
1576
1577 static ssize_t show_local_ib_port(struct device *dev,
1578 struct device_attribute *attr, char *buf)
1579 {
1580 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1581
1582 return sprintf(buf, "%d\n", target->srp_host->port);
1583 }
1584
1585 static ssize_t show_local_ib_device(struct device *dev,
1586 struct device_attribute *attr, char *buf)
1587 {
1588 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1589
1590 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1591 }
1592
1593 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1594 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1595 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1596 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1597 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1598 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1599 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
1600 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1601 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1602 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1603
1604 static struct device_attribute *srp_host_attrs[] = {
1605 &dev_attr_id_ext,
1606 &dev_attr_ioc_guid,
1607 &dev_attr_service_id,
1608 &dev_attr_pkey,
1609 &dev_attr_dgid,
1610 &dev_attr_orig_dgid,
1611 &dev_attr_req_lim,
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);
Tomato firmware and modifications.