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IB/srp: allow lockless work posting
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / infiniband / ulp / srp / ib_srp.c
blobaa78d2615c8dfafb7283fd1318a602512105715d
1 /*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/err.h>
37 #include <linux/string.h>
38 #include <linux/parser.h>
39 #include <linux/random.h>
40 #include <linux/jiffies.h>
41
42 #include <asm/atomic.h>
43
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_dbg.h>
47 #include <scsi/srp.h>
48 #include <scsi/scsi_transport_srp.h>
49
50 #include "ib_srp.h"
51
52 #define DRV_NAME "ib_srp"
53 #define PFX DRV_NAME ": "
54 #define DRV_VERSION "0.2"
55 #define DRV_RELDATE "November 1, 2005"
56
57 MODULE_AUTHOR("Roland Dreier");
58 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
59 "v" DRV_VERSION " (" DRV_RELDATE ")");
60 MODULE_LICENSE("Dual BSD/GPL");
61
62 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
63 static int srp_max_iu_len;
64
65 module_param(srp_sg_tablesize, int, 0444);
66 MODULE_PARM_DESC(srp_sg_tablesize,
67 "Max number of gather/scatter entries per I/O (default is 12, max 255)");
68
69 static int topspin_workarounds = 1;
70
71 module_param(topspin_workarounds, int, 0444);
72 MODULE_PARM_DESC(topspin_workarounds,
73 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
74
75 static int mellanox_workarounds = 1;
76
77 module_param(mellanox_workarounds, int, 0444);
78 MODULE_PARM_DESC(mellanox_workarounds,
79 "Enable workarounds for Mellanox SRP target bugs if != 0");
80
81 static void srp_add_one(struct ib_device *device);
82 static void srp_remove_one(struct ib_device *device);
83 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
84 static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
85 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
86
87 static struct scsi_transport_template *ib_srp_transport_template;
88
89 static struct ib_client srp_client = {
90 .name = "srp",
91 .add = srp_add_one,
92 .remove = srp_remove_one
93 };
94
95 static struct ib_sa_client srp_sa_client;
96
97 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
98 {
99 return (struct srp_target_port *) host->hostdata;
100 }
101
102 static const char *srp_target_info(struct Scsi_Host *host)
103 {
104 return host_to_target(host)->target_name;
105 }
106
107 static int srp_target_is_topspin(struct srp_target_port *target)
108 {
109 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
110 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
111
112 return topspin_workarounds &&
113 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
114 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
115 }
116
117 static int srp_target_is_mellanox(struct srp_target_port *target)
118 {
119 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
120
121 return mellanox_workarounds &&
122 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
123 }
124
125 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
126 gfp_t gfp_mask,
127 enum dma_data_direction direction)
128 {
129 struct srp_iu *iu;
130
131 iu = kmalloc(sizeof *iu, gfp_mask);
132 if (!iu)
133 goto out;
134
135 iu->buf = kzalloc(size, gfp_mask);
136 if (!iu->buf)
137 goto out_free_iu;
138
139 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
140 direction);
141 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
142 goto out_free_buf;
143
144 iu->size = size;
145 iu->direction = direction;
146
147 return iu;
148
149 out_free_buf:
150 kfree(iu->buf);
151 out_free_iu:
152 kfree(iu);
153 out:
154 return NULL;
155 }
156
157 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
158 {
159 if (!iu)
160 return;
161
162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
163 iu->direction);
164 kfree(iu->buf);
165 kfree(iu);
166 }
167
168 static void srp_qp_event(struct ib_event *event, void *context)
169 {
170 printk(KERN_ERR PFX "QP event %d\n", event->event);
171 }
172
173 static int srp_init_qp(struct srp_target_port *target,
174 struct ib_qp *qp)
175 {
176 struct ib_qp_attr *attr;
177 int ret;
178
179 attr = kmalloc(sizeof *attr, GFP_KERNEL);
180 if (!attr)
181 return -ENOMEM;
182
183 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
184 target->srp_host->port,
185 be16_to_cpu(target->path.pkey),
186 &attr->pkey_index);
187 if (ret)
188 goto out;
189
190 attr->qp_state = IB_QPS_INIT;
191 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
192 IB_ACCESS_REMOTE_WRITE);
193 attr->port_num = target->srp_host->port;
194
195 ret = ib_modify_qp(qp, attr,
196 IB_QP_STATE |
197 IB_QP_PKEY_INDEX |
198 IB_QP_ACCESS_FLAGS |
199 IB_QP_PORT);
200
201 out:
202 kfree(attr);
203 return ret;
204 }
205
206 static int srp_new_cm_id(struct srp_target_port *target)
207 {
208 struct ib_cm_id *new_cm_id;
209
210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
211 srp_cm_handler, target);
212 if (IS_ERR(new_cm_id))
213 return PTR_ERR(new_cm_id);
214
215 if (target->cm_id)
216 ib_destroy_cm_id(target->cm_id);
217 target->cm_id = new_cm_id;
218
219 return 0;
220 }
221
222 static int srp_create_target_ib(struct srp_target_port *target)
223 {
224 struct ib_qp_init_attr *init_attr;
225 int ret;
226
227 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
228 if (!init_attr)
229 return -ENOMEM;
230
231 target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
232 srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
233 if (IS_ERR(target->recv_cq)) {
234 ret = PTR_ERR(target->recv_cq);
235 goto err;
236 }
237
238 target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
239 srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
240 if (IS_ERR(target->send_cq)) {
241 ret = PTR_ERR(target->send_cq);
242 goto err_recv_cq;
243 }
244
245 ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP);
246
247 init_attr->event_handler = srp_qp_event;
248 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
249 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
250 init_attr->cap.max_recv_sge = 1;
251 init_attr->cap.max_send_sge = 1;
252 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
253 init_attr->qp_type = IB_QPT_RC;
254 init_attr->send_cq = target->send_cq;
255 init_attr->recv_cq = target->recv_cq;
256
257 target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
258 if (IS_ERR(target->qp)) {
259 ret = PTR_ERR(target->qp);
260 goto err_send_cq;
261 }
262
263 ret = srp_init_qp(target, target->qp);
264 if (ret)
265 goto err_qp;
266
267 kfree(init_attr);
268 return 0;
269
270 err_qp:
271 ib_destroy_qp(target->qp);
272
273 err_send_cq:
274 ib_destroy_cq(target->send_cq);
275
276 err_recv_cq:
277 ib_destroy_cq(target->recv_cq);
278
279 err:
280 kfree(init_attr);
281 return ret;
282 }
283
284 static void srp_free_target_ib(struct srp_target_port *target)
285 {
286 int i;
287
288 ib_destroy_qp(target->qp);
289 ib_destroy_cq(target->send_cq);
290 ib_destroy_cq(target->recv_cq);
291
292 for (i = 0; i < SRP_RQ_SIZE; ++i)
293 srp_free_iu(target->srp_host, target->rx_ring[i]);
294 for (i = 0; i < SRP_SQ_SIZE; ++i)
295 srp_free_iu(target->srp_host, target->tx_ring[i]);
296 }
297
298 static void srp_path_rec_completion(int status,
299 struct ib_sa_path_rec *pathrec,
300 void *target_ptr)
301 {
302 struct srp_target_port *target = target_ptr;
303
304 target->status = status;
305 if (status)
306 shost_printk(KERN_ERR, target->scsi_host,
307 PFX "Got failed path rec status %d\n", status);
308 else
309 target->path = *pathrec;
310 complete(&target->done);
311 }
312
313 static int srp_lookup_path(struct srp_target_port *target)
314 {
315 target->path.numb_path = 1;
316
317 init_completion(&target->done);
318
319 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
320 target->srp_host->srp_dev->dev,
321 target->srp_host->port,
322 &target->path,
323 IB_SA_PATH_REC_SERVICE_ID |
324 IB_SA_PATH_REC_DGID |
325 IB_SA_PATH_REC_SGID |
326 IB_SA_PATH_REC_NUMB_PATH |
327 IB_SA_PATH_REC_PKEY,
328 SRP_PATH_REC_TIMEOUT_MS,
329 GFP_KERNEL,
330 srp_path_rec_completion,
331 target, &target->path_query);
332 if (target->path_query_id < 0)
333 return target->path_query_id;
334
335 wait_for_completion(&target->done);
336
337 if (target->status < 0)
338 shost_printk(KERN_WARNING, target->scsi_host,
339 PFX "Path record query failed\n");
340
341 return target->status;
342 }
343
344 static int srp_send_req(struct srp_target_port *target)
345 {
346 struct {
347 struct ib_cm_req_param param;
348 struct srp_login_req priv;
349 } *req = NULL;
350 int status;
351
352 req = kzalloc(sizeof *req, GFP_KERNEL);
353 if (!req)
354 return -ENOMEM;
355
356 req->param.primary_path = &target->path;
357 req->param.alternate_path = NULL;
358 req->param.service_id = target->service_id;
359 req->param.qp_num = target->qp->qp_num;
360 req->param.qp_type = target->qp->qp_type;
361 req->param.private_data = &req->priv;
362 req->param.private_data_len = sizeof req->priv;
363 req->param.flow_control = 1;
364
365 get_random_bytes(&req->param.starting_psn, 4);
366 req->param.starting_psn &= 0xffffff;
367
368 /*
369 * Pick some arbitrary defaults here; we could make these
370 * module parameters if anyone cared about setting them.
371 */
372 req->param.responder_resources = 4;
373 req->param.remote_cm_response_timeout = 20;
374 req->param.local_cm_response_timeout = 20;
375 req->param.retry_count = 7;
376 req->param.rnr_retry_count = 7;
377 req->param.max_cm_retries = 15;
378
379 req->priv.opcode = SRP_LOGIN_REQ;
380 req->priv.tag = 0;
381 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
382 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
383 SRP_BUF_FORMAT_INDIRECT);
384 /*
385 * In the published SRP specification (draft rev. 16a), the
386 * port identifier format is 8 bytes of ID extension followed
387 * by 8 bytes of GUID. Older drafts put the two halves in the
388 * opposite order, so that the GUID comes first.
389 *
390 * Targets conforming to these obsolete drafts can be
391 * recognized by the I/O Class they report.
392 */
393 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
394 memcpy(req->priv.initiator_port_id,
395 &target->path.sgid.global.interface_id, 8);
396 memcpy(req->priv.initiator_port_id + 8,
397 &target->initiator_ext, 8);
398 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
399 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
400 } else {
401 memcpy(req->priv.initiator_port_id,
402 &target->initiator_ext, 8);
403 memcpy(req->priv.initiator_port_id + 8,
404 &target->path.sgid.global.interface_id, 8);
405 memcpy(req->priv.target_port_id, &target->id_ext, 8);
406 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
407 }
408
409 /*
410 * Topspin/Cisco SRP targets will reject our login unless we
411 * zero out the first 8 bytes of our initiator port ID and set
412 * the second 8 bytes to the local node GUID.
413 */
414 if (srp_target_is_topspin(target)) {
415 shost_printk(KERN_DEBUG, target->scsi_host,
416 PFX "Topspin/Cisco initiator port ID workaround "
417 "activated for target GUID %016llx\n",
418 (unsigned long long) be64_to_cpu(target->ioc_guid));
419 memset(req->priv.initiator_port_id, 0, 8);
420 memcpy(req->priv.initiator_port_id + 8,
421 &target->srp_host->srp_dev->dev->node_guid, 8);
422 }
423
424 status = ib_send_cm_req(target->cm_id, &req->param);
425
426 kfree(req);
427
428 return status;
429 }
430
431 static void srp_disconnect_target(struct srp_target_port *target)
432 {
433 /* XXX should send SRP_I_LOGOUT request */
434
435 init_completion(&target->done);
436 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
437 shost_printk(KERN_DEBUG, target->scsi_host,
438 PFX "Sending CM DREQ failed\n");
439 return;
440 }
441 wait_for_completion(&target->done);
442 }
443
444 static bool srp_change_state(struct srp_target_port *target,
445 enum srp_target_state old,
446 enum srp_target_state new)
447 {
448 bool changed = false;
449
450 spin_lock_irq(target->scsi_host->host_lock);
451 if (target->state == old) {
452 target->state = new;
453 changed = true;
454 }
455 spin_unlock_irq(target->scsi_host->host_lock);
456 return changed;
457 }
458
459 static void srp_remove_work(struct work_struct *work)
460 {
461 struct srp_target_port *target =
462 container_of(work, struct srp_target_port, work);
463
464 if (!srp_change_state(target, SRP_TARGET_DEAD, SRP_TARGET_REMOVED))
465 return;
466
467 spin_lock(&target->srp_host->target_lock);
468 list_del(&target->list);
469 spin_unlock(&target->srp_host->target_lock);
470
471 srp_remove_host(target->scsi_host);
472 scsi_remove_host(target->scsi_host);
473 ib_destroy_cm_id(target->cm_id);
474 srp_free_target_ib(target);
475 scsi_host_put(target->scsi_host);
476 }
477
478 static int srp_connect_target(struct srp_target_port *target)
479 {
480 int retries = 3;
481 int ret;
482
483 ret = srp_lookup_path(target);
484 if (ret)
485 return ret;
486
487 while (1) {
488 init_completion(&target->done);
489 ret = srp_send_req(target);
490 if (ret)
491 return ret;
492 wait_for_completion(&target->done);
493
494 /*
495 * The CM event handling code will set status to
496 * SRP_PORT_REDIRECT if we get a port redirect REJ
497 * back, or SRP_DLID_REDIRECT if we get a lid/qp
498 * redirect REJ back.
499 */
500 switch (target->status) {
501 case 0:
502 return 0;
503
504 case SRP_PORT_REDIRECT:
505 ret = srp_lookup_path(target);
506 if (ret)
507 return ret;
508 break;
509
510 case SRP_DLID_REDIRECT:
511 break;
512
513 case SRP_STALE_CONN:
514 /* Our current CM id was stale, and is now in timewait.
515 * Try to reconnect with a new one.
516 */
517 if (!retries-- || srp_new_cm_id(target)) {
518 shost_printk(KERN_ERR, target->scsi_host, PFX
519 "giving up on stale connection\n");
520 target->status = -ECONNRESET;
521 return target->status;
522 }
523
524 shost_printk(KERN_ERR, target->scsi_host, PFX
525 "retrying stale connection\n");
526 break;
527
528 default:
529 return target->status;
530 }
531 }
532 }
533
534 static void srp_unmap_data(struct scsi_cmnd *scmnd,
535 struct srp_target_port *target,
536 struct srp_request *req)
537 {
538 if (!scsi_sglist(scmnd) ||
539 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
540 scmnd->sc_data_direction != DMA_FROM_DEVICE))
541 return;
542
543 if (req->fmr) {
544 ib_fmr_pool_unmap(req->fmr);
545 req->fmr = NULL;
546 }
547
548 ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
549 scsi_sg_count(scmnd), scmnd->sc_data_direction);
550 }
551
552 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
553 {
554 srp_unmap_data(req->scmnd, target, req);
555 req->scmnd = NULL;
556 list_move_tail(&req->list, &target->free_reqs);
557 }
558
559 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
560 {
561 req->scmnd->result = DID_RESET << 16;
562 req->scmnd->scsi_done(req->scmnd);
563 srp_remove_req(target, req);
564 }
565
566 static int srp_reconnect_target(struct srp_target_port *target)
567 {
568 struct ib_qp_attr qp_attr;
569 struct srp_request *req, *tmp;
570 struct ib_wc wc;
571 int i, ret;
572
573 if (!srp_change_state(target, SRP_TARGET_LIVE, SRP_TARGET_CONNECTING))
574 return -EAGAIN;
575
576 srp_disconnect_target(target);
577 /*
578 * Now get a new local CM ID so that we avoid confusing the
579 * target in case things are really fouled up.
580 */
581 ret = srp_new_cm_id(target);
582 if (ret)
583 goto err;
584
585 qp_attr.qp_state = IB_QPS_RESET;
586 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
587 if (ret)
588 goto err;
589
590 ret = srp_init_qp(target, target->qp);
591 if (ret)
592 goto err;
593
594 while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
595 ; /* nothing */
596 while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
597 ; /* nothing */
598
599 spin_lock_irq(target->scsi_host->host_lock);
600 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
601 srp_reset_req(target, req);
602 spin_unlock_irq(target->scsi_host->host_lock);
603
604 list_del_init(&target->free_tx);
605 for (i = 0; i < SRP_SQ_SIZE; ++i)
606 list_move(&target->tx_ring[i]->list, &target->free_tx);
607
608 target->qp_in_error = 0;
609 ret = srp_connect_target(target);
610 if (ret)
611 goto err;
612
613 if (!srp_change_state(target, SRP_TARGET_CONNECTING, SRP_TARGET_LIVE))
614 ret = -EAGAIN;
615
616 return ret;
617
618 err:
619 shost_printk(KERN_ERR, target->scsi_host,
620 PFX "reconnect failed (%d), removing target port.\n", ret);
621
622 /*
623 * We couldn't reconnect, so kill our target port off.
624 * However, we have to defer the real removal because we
625 * are in the context of the SCSI error handler now, which
626 * will deadlock if we call scsi_remove_host().
627 *
628 * Schedule our work inside the lock to avoid a race with
629 * the flush_scheduled_work() in srp_remove_one().
630 */
631 spin_lock_irq(target->scsi_host->host_lock);
632 if (target->state == SRP_TARGET_CONNECTING) {
633 target->state = SRP_TARGET_DEAD;
634 INIT_WORK(&target->work, srp_remove_work);
635 schedule_work(&target->work);
636 }
637 spin_unlock_irq(target->scsi_host->host_lock);
638
639 return ret;
640 }
641
642 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
643 int sg_cnt, struct srp_request *req,
644 struct srp_direct_buf *buf)
645 {
646 u64 io_addr = 0;
647 u64 *dma_pages;
648 u32 len;
649 int page_cnt;
650 int i, j;
651 int ret;
652 struct srp_device *dev = target->srp_host->srp_dev;
653 struct ib_device *ibdev = dev->dev;
654 struct scatterlist *sg;
655
656 if (!dev->fmr_pool)
657 return -ENODEV;
658
659 if (srp_target_is_mellanox(target) &&
660 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
661 return -EINVAL;
662
663 len = page_cnt = 0;
664 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
665 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
666
667 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
668 if (i > 0)
669 return -EINVAL;
670 else
671 ++page_cnt;
672 }
673 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
674 ~dev->fmr_page_mask) {
675 if (i < sg_cnt - 1)
676 return -EINVAL;
677 else
678 ++page_cnt;
679 }
680
681 len += dma_len;
682 }
683
684 page_cnt += len >> dev->fmr_page_shift;
685 if (page_cnt > SRP_FMR_SIZE)
686 return -ENOMEM;
687
688 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
689 if (!dma_pages)
690 return -ENOMEM;
691
692 page_cnt = 0;
693 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
694 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
695
696 for (j = 0; j < dma_len; j += dev->fmr_page_size)
697 dma_pages[page_cnt++] =
698 (ib_sg_dma_address(ibdev, sg) &
699 dev->fmr_page_mask) + j;
700 }
701
702 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
703 dma_pages, page_cnt, io_addr);
704 if (IS_ERR(req->fmr)) {
705 ret = PTR_ERR(req->fmr);
706 req->fmr = NULL;
707 goto out;
708 }
709
710 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
711 ~dev->fmr_page_mask);
712 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
713 buf->len = cpu_to_be32(len);
714
715 ret = 0;
716
717 out:
718 kfree(dma_pages);
719
720 return ret;
721 }
722
723 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
724 struct srp_request *req)
725 {
726 struct scatterlist *scat;
727 struct srp_cmd *cmd = req->cmd->buf;
728 int len, nents, count;
729 u8 fmt = SRP_DATA_DESC_DIRECT;
730 struct srp_device *dev;
731 struct ib_device *ibdev;
732
733 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
734 return sizeof (struct srp_cmd);
735
736 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
737 scmnd->sc_data_direction != DMA_TO_DEVICE) {
738 shost_printk(KERN_WARNING, target->scsi_host,
739 PFX "Unhandled data direction %d\n",
740 scmnd->sc_data_direction);
741 return -EINVAL;
742 }
743
744 nents = scsi_sg_count(scmnd);
745 scat = scsi_sglist(scmnd);
746
747 dev = target->srp_host->srp_dev;
748 ibdev = dev->dev;
749
750 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
751
752 fmt = SRP_DATA_DESC_DIRECT;
753 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
754
755 if (count == 1) {
756 /*
757 * The midlayer only generated a single gather/scatter
758 * entry, or DMA mapping coalesced everything to a
759 * single entry. So a direct descriptor along with
760 * the DMA MR suffices.
761 */
762 struct srp_direct_buf *buf = (void *) cmd->add_data;
763
764 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
765 buf->key = cpu_to_be32(dev->mr->rkey);
766 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
767 } else if (srp_map_fmr(target, scat, count, req,
768 (void *) cmd->add_data)) {
769 /*
770 * FMR mapping failed, and the scatterlist has more
771 * than one entry. Generate an indirect memory
772 * descriptor.
773 */
774 struct srp_indirect_buf *buf = (void *) cmd->add_data;
775 struct scatterlist *sg;
776 u32 datalen = 0;
777 int i;
778
779 fmt = SRP_DATA_DESC_INDIRECT;
780 len = sizeof (struct srp_cmd) +
781 sizeof (struct srp_indirect_buf) +
782 count * sizeof (struct srp_direct_buf);
783
784 scsi_for_each_sg(scmnd, sg, count, i) {
785 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
786
787 buf->desc_list[i].va =
788 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
789 buf->desc_list[i].key =
790 cpu_to_be32(dev->mr->rkey);
791 buf->desc_list[i].len = cpu_to_be32(dma_len);
792 datalen += dma_len;
793 }
794
795 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
796 cmd->data_out_desc_cnt = count;
797 else
798 cmd->data_in_desc_cnt = count;
799
800 buf->table_desc.va =
801 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
802 buf->table_desc.key =
803 cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
804 buf->table_desc.len =
805 cpu_to_be32(count * sizeof (struct srp_direct_buf));
806
807 buf->len = cpu_to_be32(datalen);
808 }
809
810 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
811 cmd->buf_fmt = fmt << 4;
812 else
813 cmd->buf_fmt = fmt;
814
815 return len;
816 }
817
818 /*
819 * Must be called with target->scsi_host->host_lock held to protect
820 * req_lim and free_tx. Lock cannot be dropped between call here and
821 * call to __srp_post_send().
822 *
823 * Note:
824 * An upper limit for the number of allocated information units for each
825 * request type is:
826 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
827 * more than Scsi_Host.can_queue requests.
828 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
829 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
830 * one unanswered SRP request to an initiator.
831 */
832 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
833 enum srp_iu_type iu_type)
834 {
835 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
836 struct srp_iu *iu;
837
838 srp_send_completion(target->send_cq, target);
839
840 if (list_empty(&target->free_tx))
841 return NULL;
842
843 /* Initiator responses to target requests do not consume credits */
844 if (target->req_lim <= rsv && iu_type != SRP_IU_RSP) {
845 ++target->zero_req_lim;
846 return NULL;
847 }
848
849 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
850 iu->type = iu_type;
851 return iu;
852 }
853
854 /*
855 * Must be called with target->scsi_host->host_lock held to protect
856 * req_lim and free_tx.
857 */
858 static int __srp_post_send(struct srp_target_port *target,
859 struct srp_iu *iu, int len)
860 {
861 struct ib_sge list;
862 struct ib_send_wr wr, *bad_wr;
863 int ret = 0;
864
865 list.addr = iu->dma;
866 list.length = len;
867 list.lkey = target->srp_host->srp_dev->mr->lkey;
868
869 wr.next = NULL;
870 wr.wr_id = (uintptr_t) iu;
871 wr.sg_list = &list;
872 wr.num_sge = 1;
873 wr.opcode = IB_WR_SEND;
874 wr.send_flags = IB_SEND_SIGNALED;
875
876 ret = ib_post_send(target->qp, &wr, &bad_wr);
877
878 if (!ret) {
879 list_del(&iu->list);
880 if (iu->type != SRP_IU_RSP)
881 --target->req_lim;
882 }
883
884 return ret;
885 }
886
887 static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
888 {
889 struct ib_recv_wr wr, *bad_wr;
890 struct ib_sge list;
891
892 list.addr = iu->dma;
893 list.length = iu->size;
894 list.lkey = target->srp_host->srp_dev->mr->lkey;
895
896 wr.next = NULL;
897 wr.wr_id = (uintptr_t) iu;
898 wr.sg_list = &list;
899 wr.num_sge = 1;
900
901 return ib_post_recv(target->qp, &wr, &bad_wr);
902 }
903
904 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
905 {
906 struct srp_request *req;
907 struct scsi_cmnd *scmnd;
908 unsigned long flags;
909 s32 delta;
910
911 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
912
913 spin_lock_irqsave(target->scsi_host->host_lock, flags);
914
915 target->req_lim += delta;
916
917 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
918 target->tsk_mgmt_status = -1;
919 if (be32_to_cpu(rsp->resp_data_len) >= 4)
920 target->tsk_mgmt_status = rsp->data[3];
921 complete(&target->tsk_mgmt_done);
922 } else {
923 req = &target->req_ring[rsp->tag];
924 scmnd = req->scmnd;
925 if (!scmnd)
926 shost_printk(KERN_ERR, target->scsi_host,
927 "Null scmnd for RSP w/tag %016llx\n",
928 (unsigned long long) rsp->tag);
929 scmnd->result = rsp->status;
930
931 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
932 memcpy(scmnd->sense_buffer, rsp->data +
933 be32_to_cpu(rsp->resp_data_len),
934 min_t(int, be32_to_cpu(rsp->sense_data_len),
935 SCSI_SENSE_BUFFERSIZE));
936 }
937
938 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
939 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
940 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
941 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
942
943 scmnd->host_scribble = NULL;
944 scmnd->scsi_done(scmnd);
945 srp_remove_req(target, req);
946 }
947
948 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
949 }
950
951 static int srp_response_common(struct srp_target_port *target, s32 req_delta,
952 void *rsp, int len)
953 {
954 struct ib_device *dev;
955 unsigned long flags;
956 struct srp_iu *iu;
957 int err = 1;
958
959 dev = target->srp_host->srp_dev->dev;
960
961 spin_lock_irqsave(target->scsi_host->host_lock, flags);
962 target->req_lim += req_delta;
963
964 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
965 if (!iu) {
966 shost_printk(KERN_ERR, target->scsi_host, PFX
967 "no IU available to send response\n");
968 goto out;
969 }
970
971 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
972 memcpy(iu->buf, rsp, len);
973 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
974
975 err = __srp_post_send(target, iu, len);
976 if (err)
977 shost_printk(KERN_ERR, target->scsi_host, PFX
978 "unable to post response: %d\n", err);
979
980 out:
981 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
982 return err;
983 }
984
985 static void srp_process_cred_req(struct srp_target_port *target,
986 struct srp_cred_req *req)
987 {
988 struct srp_cred_rsp rsp = {
989 .opcode = SRP_CRED_RSP,
990 .tag = req->tag,
991 };
992 s32 delta = be32_to_cpu(req->req_lim_delta);
993
994 if (srp_response_common(target, delta, &rsp, sizeof rsp))
995 shost_printk(KERN_ERR, target->scsi_host, PFX
996 "problems processing SRP_CRED_REQ\n");
997 }
998
999 static void srp_process_aer_req(struct srp_target_port *target,
1000 struct srp_aer_req *req)
1001 {
1002 struct srp_aer_rsp rsp = {
1003 .opcode = SRP_AER_RSP,
1004 .tag = req->tag,
1005 };
1006 s32 delta = be32_to_cpu(req->req_lim_delta);
1007
1008 shost_printk(KERN_ERR, target->scsi_host, PFX
1009 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1010
1011 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1012 shost_printk(KERN_ERR, target->scsi_host, PFX
1013 "problems processing SRP_AER_REQ\n");
1014 }
1015
1016 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1017 {
1018 struct ib_device *dev = target->srp_host->srp_dev->dev;
1019 struct srp_iu *iu = (struct srp_iu *) wc->wr_id;
1020 int res;
1021 u8 opcode;
1022
1023 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1024 DMA_FROM_DEVICE);
1025
1026 opcode = *(u8 *) iu->buf;
1027
1028 if (0) {
1029 shost_printk(KERN_ERR, target->scsi_host,
1030 PFX "recv completion, opcode 0x%02x\n", opcode);
1031 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1032 iu->buf, wc->byte_len, true);
1033 }
1034
1035 switch (opcode) {
1036 case SRP_RSP:
1037 srp_process_rsp(target, iu->buf);
1038 break;
1039
1040 case SRP_CRED_REQ:
1041 srp_process_cred_req(target, iu->buf);
1042 break;
1043
1044 case SRP_AER_REQ:
1045 srp_process_aer_req(target, iu->buf);
1046 break;
1047
1048 case SRP_T_LOGOUT:
1049 /* XXX Handle target logout */
1050 shost_printk(KERN_WARNING, target->scsi_host,
1051 PFX "Got target logout request\n");
1052 break;
1053
1054 default:
1055 shost_printk(KERN_WARNING, target->scsi_host,
1056 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1057 break;
1058 }
1059
1060 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1061 DMA_FROM_DEVICE);
1062
1063 res = srp_post_recv(target, iu);
1064 if (res != 0)
1065 shost_printk(KERN_ERR, target->scsi_host,
1066 PFX "Recv failed with error code %d\n", res);
1067 }
1068
1069 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1070 {
1071 struct srp_target_port *target = target_ptr;
1072 struct ib_wc wc;
1073
1074 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1075 while (ib_poll_cq(cq, 1, &wc) > 0) {
1076 if (wc.status) {
1077 shost_printk(KERN_ERR, target->scsi_host,
1078 PFX "failed receive status %d\n",
1079 wc.status);
1080 target->qp_in_error = 1;
1081 break;
1082 }
1083
1084 srp_handle_recv(target, &wc);
1085 }
1086 }
1087
1088 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1089 {
1090 struct srp_target_port *target = target_ptr;
1091 struct ib_wc wc;
1092 struct srp_iu *iu;
1093
1094 while (ib_poll_cq(cq, 1, &wc) > 0) {
1095 if (wc.status) {
1096 shost_printk(KERN_ERR, target->scsi_host,
1097 PFX "failed send status %d\n",
1098 wc.status);
1099 target->qp_in_error = 1;
1100 break;
1101 }
1102
1103 iu = (struct srp_iu *) wc.wr_id;
1104 list_add(&iu->list, &target->free_tx);
1105 }
1106 }
1107
1108 static int srp_queuecommand_lck(struct scsi_cmnd *scmnd,
1109 void (*done)(struct scsi_cmnd *))
1110 {
1111 struct srp_target_port *target = host_to_target(scmnd->device->host);
1112 struct srp_request *req;
1113 struct srp_iu *iu;
1114 struct srp_cmd *cmd;
1115 struct ib_device *dev;
1116 int len;
1117
1118 if (target->state == SRP_TARGET_CONNECTING)
1119 goto err;
1120
1121 if (target->state == SRP_TARGET_DEAD ||
1122 target->state == SRP_TARGET_REMOVED) {
1123 scmnd->result = DID_BAD_TARGET << 16;
1124 done(scmnd);
1125 return 0;
1126 }
1127
1128 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1129 if (!iu)
1130 goto err;
1131
1132 dev = target->srp_host->srp_dev->dev;
1133 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1134 DMA_TO_DEVICE);
1135
1136 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1137
1138 scmnd->scsi_done = done;
1139 scmnd->result = 0;
1140 scmnd->host_scribble = (void *) req;
1141
1142 cmd = iu->buf;
1143 memset(cmd, 0, sizeof *cmd);
1144
1145 cmd->opcode = SRP_CMD;
1146 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1147 cmd->tag = req->index;
1148 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1149
1150 req->scmnd = scmnd;
1151 req->cmd = iu;
1152
1153 len = srp_map_data(scmnd, target, req);
1154 if (len < 0) {
1155 shost_printk(KERN_ERR, target->scsi_host,
1156 PFX "Failed to map data\n");
1157 goto err;
1158 }
1159
1160 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1161 DMA_TO_DEVICE);
1162
1163 if (__srp_post_send(target, iu, len)) {
1164 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1165 goto err_unmap;
1166 }
1167
1168 list_move_tail(&req->list, &target->req_queue);
1169
1170 return 0;
1171
1172 err_unmap:
1173 srp_unmap_data(scmnd, target, req);
1174
1175 err:
1176 return SCSI_MLQUEUE_HOST_BUSY;
1177 }
1178
1179 static DEF_SCSI_QCMD(srp_queuecommand)
1180
1181 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1182 {
1183 int i;
1184
1185 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1186 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1187 target->max_ti_iu_len,
1188 GFP_KERNEL, DMA_FROM_DEVICE);
1189 if (!target->rx_ring[i])
1190 goto err;
1191 }
1192
1193 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1194 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1195 srp_max_iu_len,
1196 GFP_KERNEL, DMA_TO_DEVICE);
1197 if (!target->tx_ring[i])
1198 goto err;
1199
1200 list_add(&target->tx_ring[i]->list, &target->free_tx);
1201 }
1202
1203 return 0;
1204
1205 err:
1206 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1207 srp_free_iu(target->srp_host, target->rx_ring[i]);
1208 target->rx_ring[i] = NULL;
1209 }
1210
1211 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1212 srp_free_iu(target->srp_host, target->tx_ring[i]);
1213 target->tx_ring[i] = NULL;
1214 }
1215
1216 return -ENOMEM;
1217 }
1218
1219 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1220 struct ib_cm_event *event,
1221 struct srp_target_port *target)
1222 {
1223 struct Scsi_Host *shost = target->scsi_host;
1224 struct ib_class_port_info *cpi;
1225 int opcode;
1226
1227 switch (event->param.rej_rcvd.reason) {
1228 case IB_CM_REJ_PORT_CM_REDIRECT:
1229 cpi = event->param.rej_rcvd.ari;
1230 target->path.dlid = cpi->redirect_lid;
1231 target->path.pkey = cpi->redirect_pkey;
1232 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1233 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1234
1235 target->status = target->path.dlid ?
1236 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1237 break;
1238
1239 case IB_CM_REJ_PORT_REDIRECT:
1240 if (srp_target_is_topspin(target)) {
1241 /*
1242 * Topspin/Cisco SRP gateways incorrectly send
1243 * reject reason code 25 when they mean 24
1244 * (port redirect).
1245 */
1246 memcpy(target->path.dgid.raw,
1247 event->param.rej_rcvd.ari, 16);
1248
1249 shost_printk(KERN_DEBUG, shost,
1250 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1251 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1252 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1253
1254 target->status = SRP_PORT_REDIRECT;
1255 } else {
1256 shost_printk(KERN_WARNING, shost,
1257 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1258 target->status = -ECONNRESET;
1259 }
1260 break;
1261
1262 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1263 shost_printk(KERN_WARNING, shost,
1264 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1265 target->status = -ECONNRESET;
1266 break;
1267
1268 case IB_CM_REJ_CONSUMER_DEFINED:
1269 opcode = *(u8 *) event->private_data;
1270 if (opcode == SRP_LOGIN_REJ) {
1271 struct srp_login_rej *rej = event->private_data;
1272 u32 reason = be32_to_cpu(rej->reason);
1273
1274 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1275 shost_printk(KERN_WARNING, shost,
1276 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1277 else
1278 shost_printk(KERN_WARNING, shost,
1279 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1280 } else
1281 shost_printk(KERN_WARNING, shost,
1282 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1283 " opcode 0x%02x\n", opcode);
1284 target->status = -ECONNRESET;
1285 break;
1286
1287 case IB_CM_REJ_STALE_CONN:
1288 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1289 target->status = SRP_STALE_CONN;
1290 break;
1291
1292 default:
1293 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1294 event->param.rej_rcvd.reason);
1295 target->status = -ECONNRESET;
1296 }
1297 }
1298
1299 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1300 {
1301 struct srp_target_port *target = cm_id->context;
1302 struct ib_qp_attr *qp_attr = NULL;
1303 int attr_mask = 0;
1304 int comp = 0;
1305 int opcode = 0;
1306 int i;
1307
1308 switch (event->event) {
1309 case IB_CM_REQ_ERROR:
1310 shost_printk(KERN_DEBUG, target->scsi_host,
1311 PFX "Sending CM REQ failed\n");
1312 comp = 1;
1313 target->status = -ECONNRESET;
1314 break;
1315
1316 case IB_CM_REP_RECEIVED:
1317 comp = 1;
1318 opcode = *(u8 *) event->private_data;
1319
1320 if (opcode == SRP_LOGIN_RSP) {
1321 struct srp_login_rsp *rsp = event->private_data;
1322
1323 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1324 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1325
1326 /*
1327 * Reserve credits for task management so we don't
1328 * bounce requests back to the SCSI mid-layer.
1329 */
1330 target->scsi_host->can_queue
1331 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1332 target->scsi_host->can_queue);
1333 } else {
1334 shost_printk(KERN_WARNING, target->scsi_host,
1335 PFX "Unhandled RSP opcode %#x\n", opcode);
1336 target->status = -ECONNRESET;
1337 break;
1338 }
1339
1340 if (!target->rx_ring[0]) {
1341 target->status = srp_alloc_iu_bufs(target);
1342 if (target->status)
1343 break;
1344 }
1345
1346 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1347 if (!qp_attr) {
1348 target->status = -ENOMEM;
1349 break;
1350 }
1351
1352 qp_attr->qp_state = IB_QPS_RTR;
1353 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1354 if (target->status)
1355 break;
1356
1357 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1358 if (target->status)
1359 break;
1360
1361 for (i = 0; i < SRP_RQ_SIZE; i++) {
1362 struct srp_iu *iu = target->rx_ring[i];
1363 target->status = srp_post_recv(target, iu);
1364 if (target->status)
1365 break;
1366 }
1367 if (target->status)
1368 break;
1369
1370 qp_attr->qp_state = IB_QPS_RTS;
1371 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1372 if (target->status)
1373 break;
1374
1375 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1376 if (target->status)
1377 break;
1378
1379 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1380 if (target->status)
1381 break;
1382
1383 break;
1384
1385 case IB_CM_REJ_RECEIVED:
1386 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1387 comp = 1;
1388
1389 srp_cm_rej_handler(cm_id, event, target);
1390 break;
1391
1392 case IB_CM_DREQ_RECEIVED:
1393 shost_printk(KERN_WARNING, target->scsi_host,
1394 PFX "DREQ received - connection closed\n");
1395 if (ib_send_cm_drep(cm_id, NULL, 0))
1396 shost_printk(KERN_ERR, target->scsi_host,
1397 PFX "Sending CM DREP failed\n");
1398 break;
1399
1400 case IB_CM_TIMEWAIT_EXIT:
1401 shost_printk(KERN_ERR, target->scsi_host,
1402 PFX "connection closed\n");
1403
1404 comp = 1;
1405 target->status = 0;
1406 break;
1407
1408 case IB_CM_MRA_RECEIVED:
1409 case IB_CM_DREQ_ERROR:
1410 case IB_CM_DREP_RECEIVED:
1411 break;
1412
1413 default:
1414 shost_printk(KERN_WARNING, target->scsi_host,
1415 PFX "Unhandled CM event %d\n", event->event);
1416 break;
1417 }
1418
1419 if (comp)
1420 complete(&target->done);
1421
1422 kfree(qp_attr);
1423
1424 return 0;
1425 }
1426
1427 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1428 u64 req_tag, unsigned int lun, u8 func)
1429 {
1430 struct ib_device *dev = target->srp_host->srp_dev->dev;
1431 struct srp_iu *iu;
1432 struct srp_tsk_mgmt *tsk_mgmt;
1433
1434 spin_lock_irq(target->scsi_host->host_lock);
1435
1436 if (target->state == SRP_TARGET_DEAD ||
1437 target->state == SRP_TARGET_REMOVED)
1438 goto out;
1439
1440 init_completion(&target->tsk_mgmt_done);
1441
1442 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1443 if (!iu)
1444 goto out;
1445
1446 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1447 DMA_TO_DEVICE);
1448 tsk_mgmt = iu->buf;
1449 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1450
1451 tsk_mgmt->opcode = SRP_TSK_MGMT;
1452 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1453 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
1454 tsk_mgmt->tsk_mgmt_func = func;
1455 tsk_mgmt->task_tag = req_tag;
1456
1457 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1458 DMA_TO_DEVICE);
1459 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1460 goto out;
1461
1462 spin_unlock_irq(target->scsi_host->host_lock);
1463
1464 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
1465 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1466 return -1;
1467
1468 return 0;
1469
1470 out:
1471 spin_unlock_irq(target->scsi_host->host_lock);
1472 return -1;
1473 }
1474
1475 static int srp_abort(struct scsi_cmnd *scmnd)
1476 {
1477 struct srp_target_port *target = host_to_target(scmnd->device->host);
1478 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
1479 int ret = SUCCESS;
1480
1481 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1482
1483 if (!req || target->qp_in_error)
1484 return FAILED;
1485 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
1486 SRP_TSK_ABORT_TASK))
1487 return FAILED;
1488
1489 spin_lock_irq(target->scsi_host->host_lock);
1490
1491 if (req->scmnd) {
1492 if (!target->tsk_mgmt_status) {
1493 srp_remove_req(target, req);
1494 scmnd->result = DID_ABORT << 16;
1495 } else
1496 ret = FAILED;
1497 }
1498
1499 spin_unlock_irq(target->scsi_host->host_lock);
1500
1501 return ret;
1502 }
1503
1504 static int srp_reset_device(struct scsi_cmnd *scmnd)
1505 {
1506 struct srp_target_port *target = host_to_target(scmnd->device->host);
1507 struct srp_request *req, *tmp;
1508
1509 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1510
1511 if (target->qp_in_error)
1512 return FAILED;
1513 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
1514 SRP_TSK_LUN_RESET))
1515 return FAILED;
1516 if (target->tsk_mgmt_status)
1517 return FAILED;
1518
1519 spin_lock_irq(target->scsi_host->host_lock);
1520
1521 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1522 if (req->scmnd && req->scmnd->device == scmnd->device)
1523 srp_reset_req(target, req);
1524
1525 spin_unlock_irq(target->scsi_host->host_lock);
1526
1527 return SUCCESS;
1528 }
1529
1530 static int srp_reset_host(struct scsi_cmnd *scmnd)
1531 {
1532 struct srp_target_port *target = host_to_target(scmnd->device->host);
1533 int ret = FAILED;
1534
1535 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1536
1537 if (!srp_reconnect_target(target))
1538 ret = SUCCESS;
1539
1540 return ret;
1541 }
1542
1543 static ssize_t show_id_ext(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, "0x%016llx\n",
1553 (unsigned long long) be64_to_cpu(target->id_ext));
1554 }
1555
1556 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1557 char *buf)
1558 {
1559 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1560
1561 if (target->state == SRP_TARGET_DEAD ||
1562 target->state == SRP_TARGET_REMOVED)
1563 return -ENODEV;
1564
1565 return sprintf(buf, "0x%016llx\n",
1566 (unsigned long long) be64_to_cpu(target->ioc_guid));
1567 }
1568
1569 static ssize_t show_service_id(struct device *dev,
1570 struct device_attribute *attr, char *buf)
1571 {
1572 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1573
1574 if (target->state == SRP_TARGET_DEAD ||
1575 target->state == SRP_TARGET_REMOVED)
1576 return -ENODEV;
1577
1578 return sprintf(buf, "0x%016llx\n",
1579 (unsigned long long) be64_to_cpu(target->service_id));
1580 }
1581
1582 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1583 char *buf)
1584 {
1585 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1586
1587 if (target->state == SRP_TARGET_DEAD ||
1588 target->state == SRP_TARGET_REMOVED)
1589 return -ENODEV;
1590
1591 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1592 }
1593
1594 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1595 char *buf)
1596 {
1597 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1598
1599 if (target->state == SRP_TARGET_DEAD ||
1600 target->state == SRP_TARGET_REMOVED)
1601 return -ENODEV;
1602
1603 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1604 }
1605
1606 static ssize_t show_orig_dgid(struct device *dev,
1607 struct device_attribute *attr, char *buf)
1608 {
1609 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1610
1611 if (target->state == SRP_TARGET_DEAD ||
1612 target->state == SRP_TARGET_REMOVED)
1613 return -ENODEV;
1614
1615 return sprintf(buf, "%pI6\n", target->orig_dgid);
1616 }
1617
1618 static ssize_t show_req_lim(struct device *dev,
1619 struct device_attribute *attr, char *buf)
1620 {
1621 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1622
1623 if (target->state == SRP_TARGET_DEAD ||
1624 target->state == SRP_TARGET_REMOVED)
1625 return -ENODEV;
1626
1627 return sprintf(buf, "%d\n", target->req_lim);
1628 }
1629
1630 static ssize_t show_zero_req_lim(struct device *dev,
1631 struct device_attribute *attr, char *buf)
1632 {
1633 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1634
1635 if (target->state == SRP_TARGET_DEAD ||
1636 target->state == SRP_TARGET_REMOVED)
1637 return -ENODEV;
1638
1639 return sprintf(buf, "%d\n", target->zero_req_lim);
1640 }
1641
1642 static ssize_t show_local_ib_port(struct device *dev,
1643 struct device_attribute *attr, char *buf)
1644 {
1645 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1646
1647 return sprintf(buf, "%d\n", target->srp_host->port);
1648 }
1649
1650 static ssize_t show_local_ib_device(struct device *dev,
1651 struct device_attribute *attr, char *buf)
1652 {
1653 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1654
1655 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1656 }
1657
1658 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1659 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1660 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1661 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1662 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1663 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1664 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
1665 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1666 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1667 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1668
1669 static struct device_attribute *srp_host_attrs[] = {
1670 &dev_attr_id_ext,
1671 &dev_attr_ioc_guid,
1672 &dev_attr_service_id,
1673 &dev_attr_pkey,
1674 &dev_attr_dgid,
1675 &dev_attr_orig_dgid,
1676 &dev_attr_req_lim,
1677 &dev_attr_zero_req_lim,
1678 &dev_attr_local_ib_port,
1679 &dev_attr_local_ib_device,
1680 NULL
1681 };
1682
1683 static struct scsi_host_template srp_template = {
1684 .module = THIS_MODULE,
1685 .name = "InfiniBand SRP initiator",
1686 .proc_name = DRV_NAME,
1687 .info = srp_target_info,
1688 .queuecommand = srp_queuecommand,
1689 .eh_abort_handler = srp_abort,
1690 .eh_device_reset_handler = srp_reset_device,
1691 .eh_host_reset_handler = srp_reset_host,
1692 .can_queue = SRP_CMD_SQ_SIZE,
1693 .this_id = -1,
1694 .cmd_per_lun = SRP_CMD_SQ_SIZE,
1695 .use_clustering = ENABLE_CLUSTERING,
1696 .shost_attrs = srp_host_attrs
1697 };
1698
1699 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1700 {
1701 struct srp_rport_identifiers ids;
1702 struct srp_rport *rport;
1703
1704 sprintf(target->target_name, "SRP.T10:%016llX",
1705 (unsigned long long) be64_to_cpu(target->id_ext));
1706
1707 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1708 return -ENODEV;
1709
1710 memcpy(ids.port_id, &target->id_ext, 8);
1711 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1712 ids.roles = SRP_RPORT_ROLE_TARGET;
1713 rport = srp_rport_add(target->scsi_host, &ids);
1714 if (IS_ERR(rport)) {
1715 scsi_remove_host(target->scsi_host);
1716 return PTR_ERR(rport);
1717 }
1718
1719 spin_lock(&host->target_lock);
1720 list_add_tail(&target->list, &host->target_list);
1721 spin_unlock(&host->target_lock);
1722
1723 target->state = SRP_TARGET_LIVE;
1724
1725 scsi_scan_target(&target->scsi_host->shost_gendev,
1726 0, target->scsi_id, SCAN_WILD_CARD, 0);
1727
1728 return 0;
1729 }
1730
1731 static void srp_release_dev(struct device *dev)
1732 {
1733 struct srp_host *host =
1734 container_of(dev, struct srp_host, dev);
1735
1736 complete(&host->released);
1737 }
1738
1739 static struct class srp_class = {
1740 .name = "infiniband_srp",
1741 .dev_release = srp_release_dev
1742 };
1743
1744 /*
1745 * Target ports are added by writing
1746 *
1747 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1748 * pkey=<P_Key>,service_id=<service ID>
1749 *
1750 * to the add_target sysfs attribute.
1751 */
1752 enum {
1753 SRP_OPT_ERR = 0,
1754 SRP_OPT_ID_EXT = 1 << 0,
1755 SRP_OPT_IOC_GUID = 1 << 1,
1756 SRP_OPT_DGID = 1 << 2,
1757 SRP_OPT_PKEY = 1 << 3,
1758 SRP_OPT_SERVICE_ID = 1 << 4,
1759 SRP_OPT_MAX_SECT = 1 << 5,
1760 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1761 SRP_OPT_IO_CLASS = 1 << 7,
1762 SRP_OPT_INITIATOR_EXT = 1 << 8,
1763 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1764 SRP_OPT_IOC_GUID |
1765 SRP_OPT_DGID |
1766 SRP_OPT_PKEY |
1767 SRP_OPT_SERVICE_ID),
1768 };
1769
1770 static const match_table_t srp_opt_tokens = {
1771 { SRP_OPT_ID_EXT, "id_ext=%s" },
1772 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1773 { SRP_OPT_DGID, "dgid=%s" },
1774 { SRP_OPT_PKEY, "pkey=%x" },
1775 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1776 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1777 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1778 { SRP_OPT_IO_CLASS, "io_class=%x" },
1779 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1780 { SRP_OPT_ERR, NULL }
1781 };
1782
1783 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1784 {
1785 char *options, *sep_opt;
1786 char *p;
1787 char dgid[3];
1788 substring_t args[MAX_OPT_ARGS];
1789 int opt_mask = 0;
1790 int token;
1791 int ret = -EINVAL;
1792 int i;
1793
1794 options = kstrdup(buf, GFP_KERNEL);
1795 if (!options)
1796 return -ENOMEM;
1797
1798 sep_opt = options;
1799 while ((p = strsep(&sep_opt, ",")) != NULL) {
1800 if (!*p)
1801 continue;
1802
1803 token = match_token(p, srp_opt_tokens, args);
1804 opt_mask |= token;
1805
1806 switch (token) {
1807 case SRP_OPT_ID_EXT:
1808 p = match_strdup(args);
1809 if (!p) {
1810 ret = -ENOMEM;
1811 goto out;
1812 }
1813 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1814 kfree(p);
1815 break;
1816
1817 case SRP_OPT_IOC_GUID:
1818 p = match_strdup(args);
1819 if (!p) {
1820 ret = -ENOMEM;
1821 goto out;
1822 }
1823 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1824 kfree(p);
1825 break;
1826
1827 case SRP_OPT_DGID:
1828 p = match_strdup(args);
1829 if (!p) {
1830 ret = -ENOMEM;
1831 goto out;
1832 }
1833 if (strlen(p) != 32) {
1834 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1835 kfree(p);
1836 goto out;
1837 }
1838
1839 for (i = 0; i < 16; ++i) {
1840 strlcpy(dgid, p + i * 2, 3);
1841 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1842 }
1843 kfree(p);
1844 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1845 break;
1846
1847 case SRP_OPT_PKEY:
1848 if (match_hex(args, &token)) {
1849 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1850 goto out;
1851 }
1852 target->path.pkey = cpu_to_be16(token);
1853 break;
1854
1855 case SRP_OPT_SERVICE_ID:
1856 p = match_strdup(args);
1857 if (!p) {
1858 ret = -ENOMEM;
1859 goto out;
1860 }
1861 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1862 target->path.service_id = target->service_id;
1863 kfree(p);
1864 break;
1865
1866 case SRP_OPT_MAX_SECT:
1867 if (match_int(args, &token)) {
1868 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1869 goto out;
1870 }
1871 target->scsi_host->max_sectors = token;
1872 break;
1873
1874 case SRP_OPT_MAX_CMD_PER_LUN:
1875 if (match_int(args, &token)) {
1876 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1877 goto out;
1878 }
1879 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
1880 break;
1881
1882 case SRP_OPT_IO_CLASS:
1883 if (match_hex(args, &token)) {
1884 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1885 goto out;
1886 }
1887 if (token != SRP_REV10_IB_IO_CLASS &&
1888 token != SRP_REV16A_IB_IO_CLASS) {
1889 printk(KERN_WARNING PFX "unknown IO class parameter value"
1890 " %x specified (use %x or %x).\n",
1891 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1892 goto out;
1893 }
1894 target->io_class = token;
1895 break;
1896
1897 case SRP_OPT_INITIATOR_EXT:
1898 p = match_strdup(args);
1899 if (!p) {
1900 ret = -ENOMEM;
1901 goto out;
1902 }
1903 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1904 kfree(p);
1905 break;
1906
1907 default:
1908 printk(KERN_WARNING PFX "unknown parameter or missing value "
1909 "'%s' in target creation request\n", p);
1910 goto out;
1911 }
1912 }
1913
1914 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1915 ret = 0;
1916 else
1917 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1918 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1919 !(srp_opt_tokens[i].token & opt_mask))
1920 printk(KERN_WARNING PFX "target creation request is "
1921 "missing parameter '%s'\n",
1922 srp_opt_tokens[i].pattern);
1923
1924 out:
1925 kfree(options);
1926 return ret;
1927 }
1928
1929 static ssize_t srp_create_target(struct device *dev,
1930 struct device_attribute *attr,
1931 const char *buf, size_t count)
1932 {
1933 struct srp_host *host =
1934 container_of(dev, struct srp_host, dev);
1935 struct Scsi_Host *target_host;
1936 struct srp_target_port *target;
1937 int ret;
1938 int i;
1939
1940 target_host = scsi_host_alloc(&srp_template,
1941 sizeof (struct srp_target_port));
1942 if (!target_host)
1943 return -ENOMEM;
1944
1945 target_host->transportt = ib_srp_transport_template;
1946 target_host->max_lun = SRP_MAX_LUN;
1947 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1948
1949 target = host_to_target(target_host);
1950
1951 target->io_class = SRP_REV16A_IB_IO_CLASS;
1952 target->scsi_host = target_host;
1953 target->srp_host = host;
1954
1955 INIT_LIST_HEAD(&target->free_tx);
1956 INIT_LIST_HEAD(&target->free_reqs);
1957 INIT_LIST_HEAD(&target->req_queue);
1958 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1959 target->req_ring[i].index = i;
1960 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1961 }
1962
1963 ret = srp_parse_options(buf, target);
1964 if (ret)
1965 goto err;
1966
1967 ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1968
1969 shost_printk(KERN_DEBUG, target->scsi_host, PFX
1970 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1971 "service_id %016llx dgid %pI6\n",
1972 (unsigned long long) be64_to_cpu(target->id_ext),
1973 (unsigned long long) be64_to_cpu(target->ioc_guid),
1974 be16_to_cpu(target->path.pkey),
1975 (unsigned long long) be64_to_cpu(target->service_id),
1976 target->path.dgid.raw);
1977
1978 ret = srp_create_target_ib(target);
1979 if (ret)
1980 goto err;
1981
1982 ret = srp_new_cm_id(target);
1983 if (ret)
1984 goto err_free;
1985
1986 target->qp_in_error = 0;
1987 ret = srp_connect_target(target);
1988 if (ret) {
1989 shost_printk(KERN_ERR, target->scsi_host,
1990 PFX "Connection failed\n");
1991 goto err_cm_id;
1992 }
1993
1994 ret = srp_add_target(host, target);
1995 if (ret)
1996 goto err_disconnect;
1997
1998 return count;
1999
2000 err_disconnect:
2001 srp_disconnect_target(target);
2002
2003 err_cm_id:
2004 ib_destroy_cm_id(target->cm_id);
2005
2006 err_free:
2007 srp_free_target_ib(target);
2008
2009 err:
2010 scsi_host_put(target_host);
2011
2012 return ret;
2013 }
2014
2015 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2016
2017 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2018 char *buf)
2019 {
2020 struct srp_host *host = container_of(dev, struct srp_host, dev);
2021
2022 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2023 }
2024
2025 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2026
2027 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2028 char *buf)
2029 {
2030 struct srp_host *host = container_of(dev, struct srp_host, dev);
2031
2032 return sprintf(buf, "%d\n", host->port);
2033 }
2034
2035 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2036
2037 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2038 {
2039 struct srp_host *host;
2040
2041 host = kzalloc(sizeof *host, GFP_KERNEL);
2042 if (!host)
2043 return NULL;
2044
2045 INIT_LIST_HEAD(&host->target_list);
2046 spin_lock_init(&host->target_lock);
2047 init_completion(&host->released);
2048 host->srp_dev = device;
2049 host->port = port;
2050
2051 host->dev.class = &srp_class;
2052 host->dev.parent = device->dev->dma_device;
2053 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2054
2055 if (device_register(&host->dev))
2056 goto free_host;
2057 if (device_create_file(&host->dev, &dev_attr_add_target))
2058 goto err_class;
2059 if (device_create_file(&host->dev, &dev_attr_ibdev))
2060 goto err_class;
2061 if (device_create_file(&host->dev, &dev_attr_port))
2062 goto err_class;
2063
2064 return host;
2065
2066 err_class:
2067 device_unregister(&host->dev);
2068
2069 free_host:
2070 kfree(host);
2071
2072 return NULL;
2073 }
2074
2075 static void srp_add_one(struct ib_device *device)
2076 {
2077 struct srp_device *srp_dev;
2078 struct ib_device_attr *dev_attr;
2079 struct ib_fmr_pool_param fmr_param;
2080 struct srp_host *host;
2081 int s, e, p;
2082
2083 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2084 if (!dev_attr)
2085 return;
2086
2087 if (ib_query_device(device, dev_attr)) {
2088 printk(KERN_WARNING PFX "Query device failed for %s\n",
2089 device->name);
2090 goto free_attr;
2091 }
2092
2093 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2094 if (!srp_dev)
2095 goto free_attr;
2096
2097 /*
2098 * Use the smallest page size supported by the HCA, down to a
2099 * minimum of 512 bytes (which is the smallest sector that a
2100 * SCSI command will ever carry).
2101 */
2102 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2103 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
2104 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2105
2106 INIT_LIST_HEAD(&srp_dev->dev_list);
2107
2108 srp_dev->dev = device;
2109 srp_dev->pd = ib_alloc_pd(device);
2110 if (IS_ERR(srp_dev->pd))
2111 goto free_dev;
2112
2113 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2114 IB_ACCESS_LOCAL_WRITE |
2115 IB_ACCESS_REMOTE_READ |
2116 IB_ACCESS_REMOTE_WRITE);
2117 if (IS_ERR(srp_dev->mr))
2118 goto err_pd;
2119
2120 memset(&fmr_param, 0, sizeof fmr_param);
2121 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2122 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2123 fmr_param.cache = 1;
2124 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2125 fmr_param.page_shift = srp_dev->fmr_page_shift;
2126 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2127 IB_ACCESS_REMOTE_WRITE |
2128 IB_ACCESS_REMOTE_READ);
2129
2130 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2131 if (IS_ERR(srp_dev->fmr_pool))
2132 srp_dev->fmr_pool = NULL;
2133
2134 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2135 s = 0;
2136 e = 0;
2137 } else {
2138 s = 1;
2139 e = device->phys_port_cnt;
2140 }
2141
2142 for (p = s; p <= e; ++p) {
2143 host = srp_add_port(srp_dev, p);
2144 if (host)
2145 list_add_tail(&host->list, &srp_dev->dev_list);
2146 }
2147
2148 ib_set_client_data(device, &srp_client, srp_dev);
2149
2150 goto free_attr;
2151
2152 err_pd:
2153 ib_dealloc_pd(srp_dev->pd);
2154
2155 free_dev:
2156 kfree(srp_dev);
2157
2158 free_attr:
2159 kfree(dev_attr);
2160 }
2161
2162 static void srp_remove_one(struct ib_device *device)
2163 {
2164 struct srp_device *srp_dev;
2165 struct srp_host *host, *tmp_host;
2166 LIST_HEAD(target_list);
2167 struct srp_target_port *target, *tmp_target;
2168
2169 srp_dev = ib_get_client_data(device, &srp_client);
2170
2171 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2172 device_unregister(&host->dev);
2173 /*
2174 * Wait for the sysfs entry to go away, so that no new
2175 * target ports can be created.
2176 */
2177 wait_for_completion(&host->released);
2178
2179 /*
2180 * Mark all target ports as removed, so we stop queueing
2181 * commands and don't try to reconnect.
2182 */
2183 spin_lock(&host->target_lock);
2184 list_for_each_entry(target, &host->target_list, list) {
2185 spin_lock_irq(target->scsi_host->host_lock);
2186 target->state = SRP_TARGET_REMOVED;
2187 spin_unlock_irq(target->scsi_host->host_lock);
2188 }
2189 spin_unlock(&host->target_lock);
2190
2191 /*
2192 * Wait for any reconnection tasks that may have
2193 * started before we marked our target ports as
2194 * removed, and any target port removal tasks.
2195 */
2196 flush_scheduled_work();
2197
2198 list_for_each_entry_safe(target, tmp_target,
2199 &host->target_list, list) {
2200 srp_remove_host(target->scsi_host);
2201 scsi_remove_host(target->scsi_host);
2202 srp_disconnect_target(target);
2203 ib_destroy_cm_id(target->cm_id);
2204 srp_free_target_ib(target);
2205 scsi_host_put(target->scsi_host);
2206 }
2207
2208 kfree(host);
2209 }
2210
2211 if (srp_dev->fmr_pool)
2212 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2213 ib_dereg_mr(srp_dev->mr);
2214 ib_dealloc_pd(srp_dev->pd);
2215
2216 kfree(srp_dev);
2217 }
2218
2219 static struct srp_function_template ib_srp_transport_functions = {
2220 };
2221
2222 static int __init srp_init_module(void)
2223 {
2224 int ret;
2225
2226 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2227
2228 if (srp_sg_tablesize > 255) {
2229 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2230 srp_sg_tablesize = 255;
2231 }
2232
2233 ib_srp_transport_template =
2234 srp_attach_transport(&ib_srp_transport_functions);
2235 if (!ib_srp_transport_template)
2236 return -ENOMEM;
2237
2238 srp_template.sg_tablesize = srp_sg_tablesize;
2239 srp_max_iu_len = (sizeof (struct srp_cmd) +
2240 sizeof (struct srp_indirect_buf) +
2241 srp_sg_tablesize * 16);
2242
2243 ret = class_register(&srp_class);
2244 if (ret) {
2245 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2246 srp_release_transport(ib_srp_transport_template);
2247 return ret;
2248 }
2249
2250 ib_sa_register_client(&srp_sa_client);
2251
2252 ret = ib_register_client(&srp_client);
2253 if (ret) {
2254 printk(KERN_ERR PFX "couldn't register IB client\n");
2255 srp_release_transport(ib_srp_transport_template);
2256 ib_sa_unregister_client(&srp_sa_client);
2257 class_unregister(&srp_class);
2258 return ret;
2259 }
2260
2261 return 0;
2262 }
2263
2264 static void __exit srp_cleanup_module(void)
2265 {
2266 ib_unregister_client(&srp_client);
2267 ib_sa_unregister_client(&srp_sa_client);
2268 class_unregister(&srp_class);
2269 srp_release_transport(ib_srp_transport_template);
2270 }
2271
2272 module_init(srp_init_module);
2273 module_exit(srp_cleanup_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree