projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
IB/srp: stop sharing the host lock with SCSI
[deliverable/linux.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 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.
aef9ec39
RD		 31 */
32
aef9ec39
RD		 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>
de25968c 40#include <linux/jiffies.h>
aef9ec39
RD		 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>
3236822b 48#include <scsi/scsi_transport_srp.h>
aef9ec39 49
aef9ec39
RD		 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
57MODULE_AUTHOR("Roland Dreier");
58MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
59 "v" DRV_VERSION " (" DRV_RELDATE ")");
60MODULE_LICENSE("Dual BSD/GPL");
61
74b0a15b
VP		 62static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
63static int srp_max_iu_len;
64
65module_param(srp_sg_tablesize, int, 0444);
66MODULE_PARM_DESC(srp_sg_tablesize,
1e89a194 67 "Max number of gather/scatter entries per I/O (default is 12, max 255)");
74b0a15b 68
aef9ec39
RD		 69static int topspin_workarounds = 1;
70
71module_param(topspin_workarounds, int, 0444);
72MODULE_PARM_DESC(topspin_workarounds,
73 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
74
559ce8f1
IR		 75static int mellanox_workarounds = 1;
76
77module_param(mellanox_workarounds, int, 0444);
78MODULE_PARM_DESC(mellanox_workarounds,
79 "Enable workarounds for Mellanox SRP target bugs if != 0");
80
aef9ec39
RD		 81static void srp_add_one(struct ib_device *device);
82static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 83static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
84static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 85static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
86
3236822b
FT		 87static struct scsi_transport_template *ib_srp_transport_template;
88
aef9ec39
RD		 89static struct ib_client srp_client = {
90 .name = "srp",
91 .add = srp_add_one,
92 .remove = srp_remove_one
93};
94
c1a0b23b
MT		 95static struct ib_sa_client srp_sa_client;
96
aef9ec39
RD		 97static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
98{
99 return (struct srp_target_port *) host->hostdata;
100}
101
102static const char *srp_target_info(struct Scsi_Host *host)
103{
104 return host_to_target(host)->target_name;
105}
106
5d7cbfd6
RD		 107static int srp_target_is_topspin(struct srp_target_port *target)
108{
109 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 110 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 111
112 return topspin_workarounds &&
3d1ff48d
RK		 113 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
114 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 115}
116
117static 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
aef9ec39
RD		 125static 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
05321937
GKH		 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))
aef9ec39
RD		 142 goto out_free_buf;
143
144 iu->size = size;
145 iu->direction = direction;
146
147 return iu;
148
149out_free_buf:
150 kfree(iu->buf);
151out_free_iu:
152 kfree(iu);
153out:
154 return NULL;
155}
156
157static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
158{
159 if (!iu)
160 return;
161
05321937
GKH		 162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
163 iu->direction);
aef9ec39
RD		 164 kfree(iu->buf);
165 kfree(iu);
166}
167
168static void srp_qp_event(struct ib_event *event, void *context)
169{
170 printk(KERN_ERR PFX "QP event %d\n", event->event);
171}
172
173static 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
969a60f9
RD		 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);
aef9ec39
RD		 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
201out:
202 kfree(attr);
203 return ret;
204}
205
9fe4bcf4
DD		 206static int srp_new_cm_id(struct srp_target_port *target)
207{
208 struct ib_cm_id *new_cm_id;
209
05321937 210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 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
aef9ec39
RD		 222static 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
9c03dc9f
BVA		 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);
da9d2f07 235 goto err;
aef9ec39
RD		 236 }
237
9c03dc9f
BVA		 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);
da9d2f07 242 goto err_recv_cq;
9c03dc9f
BVA		 243 }
244
245 ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 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;
9c03dc9f
BVA		 254 init_attr->send_cq = target->send_cq;
255 init_attr->recv_cq = target->recv_cq;
aef9ec39 256
05321937 257 target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
aef9ec39
RD		 258 if (IS_ERR(target->qp)) {
259 ret = PTR_ERR(target->qp);
da9d2f07 260 goto err_send_cq;
aef9ec39
RD		 261 }
262
263 ret = srp_init_qp(target, target->qp);
da9d2f07
RD		 264 if (ret)
265 goto err_qp;
aef9ec39 266
da9d2f07
RD		 267 kfree(init_attr);
268 return 0;
269
270err_qp:
271 ib_destroy_qp(target->qp);
272
273err_send_cq:
274 ib_destroy_cq(target->send_cq);
275
276err_recv_cq:
277 ib_destroy_cq(target->recv_cq);
278
279err:
aef9ec39
RD		 280 kfree(init_attr);
281 return ret;
282}
283
284static void srp_free_target_ib(struct srp_target_port *target)
285{
286 int i;
287
288 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 289 ib_destroy_cq(target->send_cq);
290 ib_destroy_cq(target->recv_cq);
aef9ec39
RD		 291
292 for (i = 0; i < SRP_RQ_SIZE; ++i)
293 srp_free_iu(target->srp_host, target->rx_ring[i]);
dd5e6e38 294 for (i = 0; i < SRP_SQ_SIZE; ++i)
aef9ec39
RD		 295 srp_free_iu(target->srp_host, target->tx_ring[i]);
296}
297
298static 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)
7aa54bd7
DD		 306 shost_printk(KERN_ERR, target->scsi_host,
307 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 308 else
309 target->path = *pathrec;
310 complete(&target->done);
311}
312
313static int srp_lookup_path(struct srp_target_port *target)
314{
315 target->path.numb_path = 1;
316
317 init_completion(&target->done);
318
c1a0b23b 319 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 320 target->srp_host->srp_dev->dev,
aef9ec39
RD		 321 target->srp_host->port,
322 &target->path,
247e020e 323 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 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)
7aa54bd7
DD		 338 shost_printk(KERN_WARNING, target->scsi_host,
339 PFX "Path record query failed\n");
aef9ec39
RD		 340
341 return target->status;
342}
343
344static 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;
74b0a15b 381 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
aef9ec39
RD		 382 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
383 SRP_BUF_FORMAT_INDIRECT);
0c0450db 384 /*
3cd96564 385 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 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,
01cb9bcb 395 &target->path.sgid.global.interface_id, 8);
0c0450db 396 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 397 &target->initiator_ext, 8);
0c0450db
R		 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,
01cb9bcb
IR		 402 &target->initiator_ext, 8);
403 memcpy(req->priv.initiator_port_id + 8,
404 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 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
aef9ec39
RD		 409 /*
410 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 411 * zero out the first 8 bytes of our initiator port ID and set
412 * the second 8 bytes to the local node GUID.
aef9ec39 413 */
5d7cbfd6 414 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 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));
aef9ec39 419 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 420 memcpy(req->priv.initiator_port_id + 8,
05321937 421 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 422 }
aef9ec39
RD		 423
424 status = ib_send_cm_req(target->cm_id, &req->param);
425
426 kfree(req);
427
428 return status;
429}
430
431static void srp_disconnect_target(struct srp_target_port *target)
432{
433 /* XXX should send SRP_I_LOGOUT request */
434
435 init_completion(&target->done);
e6581056 436 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
7aa54bd7
DD		 437 shost_printk(KERN_DEBUG, target->scsi_host,
438 PFX "Sending CM DREQ failed\n");
e6581056
RD		 439 return;
440 }
aef9ec39
RD		 441 wait_for_completion(&target->done);
442}
443
9709f0e0
BVA		 444static 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
e9684678 450 spin_lock_irq(&target->lock);
9709f0e0
BVA		 451 if (target->state == old) {
452 target->state = new;
453 changed = true;
454 }
e9684678 455 spin_unlock_irq(&target->lock);
9709f0e0
BVA		 456 return changed;
457}
458
c4028958 459static void srp_remove_work(struct work_struct *work)
aef9ec39 460{
c4028958
DH		 461 struct srp_target_port *target =
462 container_of(work, struct srp_target_port, work);
aef9ec39 463
9709f0e0 464 if (!srp_change_state(target, SRP_TARGET_DEAD, SRP_TARGET_REMOVED))
aef9ec39 465 return;
aef9ec39 466
b3589fd4 467 spin_lock(&target->srp_host->target_lock);
aef9ec39 468 list_del(&target->list);
b3589fd4 469 spin_unlock(&target->srp_host->target_lock);
aef9ec39 470
3236822b 471 srp_remove_host(target->scsi_host);
aef9ec39
RD		 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);
aef9ec39
RD		 476}
477
478static int srp_connect_target(struct srp_target_port *target)
479{
9fe4bcf4 480 int retries = 3;
aef9ec39
RD		 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
9fe4bcf4
DD		 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
aef9ec39
RD		 528 default:
529 return target->status;
530 }
531 }
532}
533
d945e1df
RD		 534static void srp_unmap_data(struct scsi_cmnd *scmnd,
535 struct srp_target_port *target,
536 struct srp_request *req)
537{
bb350d1d 538 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 539 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
540 scmnd->sc_data_direction != DMA_FROM_DEVICE))
541 return;
542
f5358a17
RD		 543 if (req->fmr) {
544 ib_fmr_pool_unmap(req->fmr);
545 req->fmr = NULL;
546 }
547
05321937 548 ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
bb350d1d 549 scsi_sg_count(scmnd), scmnd->sc_data_direction);
d945e1df
RD		 550}
551
94a9174c
BVA		 552static void srp_remove_req(struct srp_target_port *target,
553 struct srp_request *req, s32 req_lim_delta)
526b4caa 554{
94a9174c
BVA		 555 unsigned long flags;
556
526b4caa 557 srp_unmap_data(req->scmnd, target, req);
e9684678 558 spin_lock_irqsave(&target->lock, flags);
94a9174c 559 target->req_lim += req_lim_delta;
f8b6e31e 560 req->scmnd = NULL;
536ae14e 561 list_add_tail(&req->list, &target->free_reqs);
e9684678 562 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 563}
564
565static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
566{
567 req->scmnd->result = DID_RESET << 16;
568 req->scmnd->scsi_done(req->scmnd);
94a9174c 569 srp_remove_req(target, req, 0);
526b4caa
IR		 570}
571
aef9ec39
RD		 572static int srp_reconnect_target(struct srp_target_port *target)
573{
aef9ec39 574 struct ib_qp_attr qp_attr;
aef9ec39 575 struct ib_wc wc;
dcb4cb85 576 int i, ret;
aef9ec39 577
9709f0e0 578 if (!srp_change_state(target, SRP_TARGET_LIVE, SRP_TARGET_CONNECTING))
aef9ec39 579 return -EAGAIN;
aef9ec39
RD		 580
581 srp_disconnect_target(target);
582 /*
583 * Now get a new local CM ID so that we avoid confusing the
584 * target in case things are really fouled up.
585 */
9fe4bcf4
DD		 586 ret = srp_new_cm_id(target);
587 if (ret)
aef9ec39 588 goto err;
aef9ec39
RD		 589
590 qp_attr.qp_state = IB_QPS_RESET;
591 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
592 if (ret)
593 goto err;
594
595 ret = srp_init_qp(target, target->qp);
596 if (ret)
597 goto err;
598
9c03dc9f
BVA		 599 while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
600 ; /* nothing */
601 while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
aef9ec39
RD		 602 ; /* nothing */
603
536ae14e
BVA		 604 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
605 struct srp_request *req = &target->req_ring[i];
606 if (req->scmnd)
607 srp_reset_req(target, req);
608 }
aef9ec39 609
536ae14e 610 INIT_LIST_HEAD(&target->free_tx);
dcb4cb85 611 for (i = 0; i < SRP_SQ_SIZE; ++i)
536ae14e 612 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 613
1033ff67 614 target->qp_in_error = 0;
aef9ec39
RD		 615 ret = srp_connect_target(target);
616 if (ret)
617 goto err;
618
9709f0e0 619 if (!srp_change_state(target, SRP_TARGET_CONNECTING, SRP_TARGET_LIVE))
aef9ec39 620 ret = -EAGAIN;
aef9ec39
RD		 621
622 return ret;
623
624err:
7aa54bd7
DD		 625 shost_printk(KERN_ERR, target->scsi_host,
626 PFX "reconnect failed (%d), removing target port.\n", ret);
aef9ec39
RD		 627
628 /*
629 * We couldn't reconnect, so kill our target port off.
9709f0e0
BVA		 630 * However, we have to defer the real removal because we
631 * are in the context of the SCSI error handler now, which
632 * will deadlock if we call scsi_remove_host().
633 *
634 * Schedule our work inside the lock to avoid a race with
635 * the flush_scheduled_work() in srp_remove_one().
aef9ec39 636 */
e9684678 637 spin_lock_irq(&target->lock);
aef9ec39
RD		 638 if (target->state == SRP_TARGET_CONNECTING) {
639 target->state = SRP_TARGET_DEAD;
c4028958 640 INIT_WORK(&target->work, srp_remove_work);
aef9ec39
RD		 641 schedule_work(&target->work);
642 }
e9684678 643 spin_unlock_irq(&target->lock);
aef9ec39
RD		 644
645 return ret;
646}
647
559ce8f1 648static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
f5358a17
RD		 649 int sg_cnt, struct srp_request *req,
650 struct srp_direct_buf *buf)
651{
652 u64 io_addr = 0;
653 u64 *dma_pages;
654 u32 len;
655 int page_cnt;
656 int i, j;
657 int ret;
05321937 658 struct srp_device *dev = target->srp_host->srp_dev;
85507bcc 659 struct ib_device *ibdev = dev->dev;
bb350d1d 660 struct scatterlist *sg;
f5358a17
RD		 661
662 if (!dev->fmr_pool)
663 return -ENODEV;
664
5d7cbfd6
RD		 665 if (srp_target_is_mellanox(target) &&
666 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
559ce8f1
IR		 667 return -EINVAL;
668
f5358a17 669 len = page_cnt = 0;
bb350d1d
FT		 670 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
671 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 672
bb350d1d 673 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
f5358a17
RD		 674 if (i > 0)
675 return -EINVAL;
676 else
677 ++page_cnt;
678 }
bb350d1d 679 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
f5358a17
RD		 680 ~dev->fmr_page_mask) {
681 if (i < sg_cnt - 1)
682 return -EINVAL;
683 else
684 ++page_cnt;
685 }
686
85507bcc 687 len += dma_len;
f5358a17
RD		 688 }
689
690 page_cnt += len >> dev->fmr_page_shift;
691 if (page_cnt > SRP_FMR_SIZE)
692 return -ENOMEM;
693
694 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
695 if (!dma_pages)
696 return -ENOMEM;
697
698 page_cnt = 0;
bb350d1d
FT		 699 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
700 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc
RC		 701
702 for (j = 0; j < dma_len; j += dev->fmr_page_size)
f5358a17 703 dma_pages[page_cnt++] =
bb350d1d 704 (ib_sg_dma_address(ibdev, sg) &
85507bcc
RC		 705 dev->fmr_page_mask) + j;
706 }
f5358a17
RD		 707
708 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
adfaa888 709 dma_pages, page_cnt, io_addr);
f5358a17
RD		 710 if (IS_ERR(req->fmr)) {
711 ret = PTR_ERR(req->fmr);
6583eb3d 712 req->fmr = NULL;
f5358a17
RD		 713 goto out;
714 }
715
85507bcc
RC		 716 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
717 ~dev->fmr_page_mask);
f5358a17
RD		 718 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
719 buf->len = cpu_to_be32(len);
720
721 ret = 0;
722
723out:
724 kfree(dma_pages);
725
726 return ret;
727}
728
aef9ec39
RD		 729static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
730 struct srp_request *req)
731{
cf368713 732 struct scatterlist *scat;
aef9ec39 733 struct srp_cmd *cmd = req->cmd->buf;
cf368713 734 int len, nents, count;
f5358a17 735 u8 fmt = SRP_DATA_DESC_DIRECT;
85507bcc
RC		 736 struct srp_device *dev;
737 struct ib_device *ibdev;
aef9ec39 738
bb350d1d 739 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 740 return sizeof (struct srp_cmd);
741
742 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
743 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 744 shost_printk(KERN_WARNING, target->scsi_host,
745 PFX "Unhandled data direction %d\n",
746 scmnd->sc_data_direction);
aef9ec39
RD		 747 return -EINVAL;
748 }
749
bb350d1d
FT		 750 nents = scsi_sg_count(scmnd);
751 scat = scsi_sglist(scmnd);
aef9ec39 752
05321937 753 dev = target->srp_host->srp_dev;
85507bcc
RC		 754 ibdev = dev->dev;
755
756 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
f5358a17
RD		 757
758 fmt = SRP_DATA_DESC_DIRECT;
759 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 760
cf368713 761 if (count == 1) {
f5358a17
RD		 762 /*
763 * The midlayer only generated a single gather/scatter
764 * entry, or DMA mapping coalesced everything to a
765 * single entry. So a direct descriptor along with
766 * the DMA MR suffices.
767 */
cf368713 768 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 769
85507bcc
RC		 770 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
771 buf->key = cpu_to_be32(dev->mr->rkey);
772 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
559ce8f1 773 } else if (srp_map_fmr(target, scat, count, req,
f5358a17
RD		 774 (void *) cmd->add_data)) {
775 /*
776 * FMR mapping failed, and the scatterlist has more
777 * than one entry. Generate an indirect memory
778 * descriptor.
779 */
cf368713 780 struct srp_indirect_buf *buf = (void *) cmd->add_data;
bb350d1d 781 struct scatterlist *sg;
cf368713 782 u32 datalen = 0;
f5358a17 783 int i;
aef9ec39 784
cf368713 785 fmt = SRP_DATA_DESC_INDIRECT;
f5358a17
RD		 786 len = sizeof (struct srp_cmd) +
787 sizeof (struct srp_indirect_buf) +
788 count * sizeof (struct srp_direct_buf);
789
bb350d1d
FT		 790 scsi_for_each_sg(scmnd, sg, count, i) {
791 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 792
f5358a17 793 buf->desc_list[i].va =
bb350d1d 794 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
f5358a17 795 buf->desc_list[i].key =
85507bcc
RC		 796 cpu_to_be32(dev->mr->rkey);
797 buf->desc_list[i].len = cpu_to_be32(dma_len);
798 datalen += dma_len;
f5358a17 799 }
aef9ec39 800
cf368713
RD		 801 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
802 cmd->data_out_desc_cnt = count;
803 else
804 cmd->data_in_desc_cnt = count;
805
f5358a17
RD		 806 buf->table_desc.va =
807 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
cf368713 808 buf->table_desc.key =
05321937 809 cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
cf368713
RD		 810 buf->table_desc.len =
811 cpu_to_be32(count * sizeof (struct srp_direct_buf));
812
cf368713 813 buf->len = cpu_to_be32(datalen);
aef9ec39
RD		 814 }
815
816 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
817 cmd->buf_fmt = fmt << 4;
818 else
819 cmd->buf_fmt = fmt;
820
aef9ec39
RD		 821 return len;
822}
823
76c75b25
BVA		 824/*
825 * Return an IU and possible credit to the free pool
826 */
827static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
828 enum srp_iu_type iu_type)
829{
830 unsigned long flags;
831
e9684678 832 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 833 list_add(&iu->list, &target->free_tx);
834 if (iu_type != SRP_IU_RSP)
835 ++target->req_lim;
e9684678 836 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 837}
838
05a1d750 839/*
e9684678
BVA		 840 * Must be called with target->lock held to protect req_lim and free_tx.
841 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 842 *
843 * Note:
844 * An upper limit for the number of allocated information units for each
845 * request type is:
846 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
847 * more than Scsi_Host.can_queue requests.
848 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
849 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
850 * one unanswered SRP request to an initiator.
851 */
852static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
853 enum srp_iu_type iu_type)
854{
855 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
856 struct srp_iu *iu;
857
858 srp_send_completion(target->send_cq, target);
859
dcb4cb85 860 if (list_empty(&target->free_tx))
05a1d750
DD		 861 return NULL;
862
863 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 864 if (iu_type != SRP_IU_RSP) {
865 if (target->req_lim <= rsv) {
866 ++target->zero_req_lim;
867 return NULL;
868 }
869
870 --target->req_lim;
05a1d750
DD		 871 }
872
dcb4cb85 873 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 874 list_del(&iu->list);
05a1d750
DD		 875 return iu;
876}
877
76c75b25
BVA		 878static int srp_post_send(struct srp_target_port *target,
879 struct srp_iu *iu, int len)
05a1d750
DD		 880{
881 struct ib_sge list;
882 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 883
884 list.addr = iu->dma;
885 list.length = len;
886 list.lkey = target->srp_host->srp_dev->mr->lkey;
887
888 wr.next = NULL;
dcb4cb85 889 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 890 wr.sg_list = &list;
891 wr.num_sge = 1;
892 wr.opcode = IB_WR_SEND;
893 wr.send_flags = IB_SEND_SIGNALED;
894
76c75b25 895 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 896}
897
dcb4cb85 898static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 899{
c996bb47 900 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 901 struct ib_sge list;
c996bb47
BVA		 902
903 list.addr = iu->dma;
904 list.length = iu->size;
905 list.lkey = target->srp_host->srp_dev->mr->lkey;
906
907 wr.next = NULL;
dcb4cb85 908 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 909 wr.sg_list = &list;
910 wr.num_sge = 1;
911
dcb4cb85 912 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 913}
914
aef9ec39
RD		 915static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
916{
917 struct srp_request *req;
918 struct scsi_cmnd *scmnd;
919 unsigned long flags;
aef9ec39 920
aef9ec39 921 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 922 spin_lock_irqsave(&target->lock, flags);
94a9174c 923 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 924 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 925
f8b6e31e
DD		 926 target->tsk_mgmt_status = -1;
927 if (be32_to_cpu(rsp->resp_data_len) >= 4)
928 target->tsk_mgmt_status = rsp->data[3];
929 complete(&target->tsk_mgmt_done);
aef9ec39 930 } else {
f8b6e31e 931 req = &target->req_ring[rsp->tag];
d945e1df 932 scmnd = req->scmnd;
aef9ec39 933 if (!scmnd)
7aa54bd7
DD		 934 shost_printk(KERN_ERR, target->scsi_host,
935 "Null scmnd for RSP w/tag %016llx\n",
936 (unsigned long long) rsp->tag);
aef9ec39
RD		 937 scmnd->result = rsp->status;
938
939 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
940 memcpy(scmnd->sense_buffer, rsp->data +
941 be32_to_cpu(rsp->resp_data_len),
942 min_t(int, be32_to_cpu(rsp->sense_data_len),
943 SCSI_SENSE_BUFFERSIZE));
944 }
945
946 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 947 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 948 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 949 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 950
94a9174c 951 srp_remove_req(target, req, be32_to_cpu(rsp->req_lim_delta));
f8b6e31e
DD		 952 scmnd->host_scribble = NULL;
953 scmnd->scsi_done(scmnd);
aef9ec39 954 }
aef9ec39
RD		 955}
956
bb12588a
DD		 957static int srp_response_common(struct srp_target_port *target, s32 req_delta,
958 void *rsp, int len)
959{
76c75b25 960 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 961 unsigned long flags;
962 struct srp_iu *iu;
76c75b25 963 int err;
bb12588a 964
e9684678 965 spin_lock_irqsave(&target->lock, flags);
bb12588a 966 target->req_lim += req_delta;
bb12588a 967 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 968 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 969
bb12588a
DD		 970 if (!iu) {
971 shost_printk(KERN_ERR, target->scsi_host, PFX
972 "no IU available to send response\n");
76c75b25 973 return 1;
bb12588a
DD		 974 }
975
976 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
977 memcpy(iu->buf, rsp, len);
978 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
979
76c75b25
BVA		 980 err = srp_post_send(target, iu, len);
981 if (err) {
bb12588a
DD		 982 shost_printk(KERN_ERR, target->scsi_host, PFX
983 "unable to post response: %d\n", err);
76c75b25
BVA		 984 srp_put_tx_iu(target, iu, SRP_IU_RSP);
985 }
bb12588a 986
bb12588a
DD		 987 return err;
988}
989
990static void srp_process_cred_req(struct srp_target_port *target,
991 struct srp_cred_req *req)
992{
993 struct srp_cred_rsp rsp = {
994 .opcode = SRP_CRED_RSP,
995 .tag = req->tag,
996 };
997 s32 delta = be32_to_cpu(req->req_lim_delta);
998
999 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1000 shost_printk(KERN_ERR, target->scsi_host, PFX
1001 "problems processing SRP_CRED_REQ\n");
1002}
1003
1004static void srp_process_aer_req(struct srp_target_port *target,
1005 struct srp_aer_req *req)
1006{
1007 struct srp_aer_rsp rsp = {
1008 .opcode = SRP_AER_RSP,
1009 .tag = req->tag,
1010 };
1011 s32 delta = be32_to_cpu(req->req_lim_delta);
1012
1013 shost_printk(KERN_ERR, target->scsi_host, PFX
1014 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1015
1016 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1017 shost_printk(KERN_ERR, target->scsi_host, PFX
1018 "problems processing SRP_AER_REQ\n");
1019}
1020
aef9ec39
RD		 1021static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1022{
dcb4cb85
BVA		 1023 struct ib_device *dev = target->srp_host->srp_dev->dev;
1024 struct srp_iu *iu = (struct srp_iu *) wc->wr_id;
c996bb47 1025 int res;
aef9ec39
RD		 1026 u8 opcode;
1027
85507bcc
RC		 1028 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1029 DMA_FROM_DEVICE);
aef9ec39
RD		 1030
1031 opcode = *(u8 *) iu->buf;
1032
1033 if (0) {
7aa54bd7
DD		 1034 shost_printk(KERN_ERR, target->scsi_host,
1035 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1036 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1037 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1038 }
1039
1040 switch (opcode) {
1041 case SRP_RSP:
1042 srp_process_rsp(target, iu->buf);
1043 break;
1044
bb12588a
DD		 1045 case SRP_CRED_REQ:
1046 srp_process_cred_req(target, iu->buf);
1047 break;
1048
1049 case SRP_AER_REQ:
1050 srp_process_aer_req(target, iu->buf);
1051 break;
1052
aef9ec39
RD		 1053 case SRP_T_LOGOUT:
1054 /* XXX Handle target logout */
7aa54bd7
DD		 1055 shost_printk(KERN_WARNING, target->scsi_host,
1056 PFX "Got target logout request\n");
aef9ec39
RD		 1057 break;
1058
1059 default:
7aa54bd7
DD		 1060 shost_printk(KERN_WARNING, target->scsi_host,
1061 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1062 break;
1063 }
1064
85507bcc
RC		 1065 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1066 DMA_FROM_DEVICE);
c996bb47 1067
dcb4cb85 1068 res = srp_post_recv(target, iu);
c996bb47
BVA		 1069 if (res != 0)
1070 shost_printk(KERN_ERR, target->scsi_host,
1071 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1072}
1073
9c03dc9f 1074static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1075{
1076 struct srp_target_port *target = target_ptr;
1077 struct ib_wc wc;
aef9ec39
RD		 1078
1079 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1080 while (ib_poll_cq(cq, 1, &wc) > 0) {
1081 if (wc.status) {
7aa54bd7 1082 shost_printk(KERN_ERR, target->scsi_host,
9c03dc9f 1083 PFX "failed receive status %d\n",
7aa54bd7 1084 wc.status);
1033ff67 1085 target->qp_in_error = 1;
aef9ec39
RD		 1086 break;
1087 }
1088
9c03dc9f
BVA		 1089 srp_handle_recv(target, &wc);
1090 }
1091}
1092
1093static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1094{
1095 struct srp_target_port *target = target_ptr;
1096 struct ib_wc wc;
dcb4cb85 1097 struct srp_iu *iu;
9c03dc9f
BVA		 1098
1099 while (ib_poll_cq(cq, 1, &wc) > 0) {
1100 if (wc.status) {
1101 shost_printk(KERN_ERR, target->scsi_host,
1102 PFX "failed send status %d\n",
1103 wc.status);
1104 target->qp_in_error = 1;
1105 break;
1106 }
1107
dcb4cb85
BVA		 1108 iu = (struct srp_iu *) wc.wr_id;
1109 list_add(&iu->list, &target->free_tx);
aef9ec39
RD		 1110 }
1111}
1112
76c75b25 1113static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1114{
76c75b25 1115 struct srp_target_port *target = host_to_target(shost);
aef9ec39
RD		 1116 struct srp_request *req;
1117 struct srp_iu *iu;
1118 struct srp_cmd *cmd;
85507bcc 1119 struct ib_device *dev;
76c75b25 1120 unsigned long flags;
aef9ec39
RD		 1121 int len;
1122
1123 if (target->state == SRP_TARGET_CONNECTING)
1124 goto err;
1125
1126 if (target->state == SRP_TARGET_DEAD ||
1127 target->state == SRP_TARGET_REMOVED) {
1128 scmnd->result = DID_BAD_TARGET << 16;
76c75b25 1129 scmnd->scsi_done(scmnd);
aef9ec39
RD		 1130 return 0;
1131 }
1132
e9684678 1133 spin_lock_irqsave(&target->lock, flags);
bb12588a 1134 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
76c75b25
BVA		 1135 if (iu) {
1136 req = list_first_entry(&target->free_reqs, struct srp_request,
1137 list);
1138 list_del(&req->list);
1139 }
e9684678 1140 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1141
aef9ec39
RD		 1142 if (!iu)
1143 goto err;
1144
05321937 1145 dev = target->srp_host->srp_dev->dev;
85507bcc
RC		 1146 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1147 DMA_TO_DEVICE);
aef9ec39 1148
aef9ec39 1149 scmnd->result = 0;
f8b6e31e 1150 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1151
1152 cmd = iu->buf;
1153 memset(cmd, 0, sizeof *cmd);
1154
1155 cmd->opcode = SRP_CMD;
1156 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1157 cmd->tag = req->index;
aef9ec39
RD		 1158 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1159
aef9ec39
RD		 1160 req->scmnd = scmnd;
1161 req->cmd = iu;
aef9ec39
RD		 1162
1163 len = srp_map_data(scmnd, target, req);
1164 if (len < 0) {
7aa54bd7
DD		 1165 shost_printk(KERN_ERR, target->scsi_host,
1166 PFX "Failed to map data\n");
76c75b25 1167 goto err_iu;
aef9ec39
RD		 1168 }
1169
85507bcc
RC		 1170 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1171 DMA_TO_DEVICE);
aef9ec39 1172
76c75b25 1173 if (srp_post_send(target, iu, len)) {
7aa54bd7 1174 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1175 goto err_unmap;
1176 }
1177
aef9ec39
RD		 1178 return 0;
1179
1180err_unmap:
1181 srp_unmap_data(scmnd, target, req);
1182
76c75b25
BVA		 1183err_iu:
1184 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1185
e9684678 1186 spin_lock_irqsave(&target->lock, flags);
76c75b25 1187 list_add(&req->list, &target->free_reqs);
e9684678 1188 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1189
aef9ec39
RD		 1190err:
1191 return SCSI_MLQUEUE_HOST_BUSY;
1192}
1193
1194static int srp_alloc_iu_bufs(struct srp_target_port *target)
1195{
1196 int i;
1197
1198 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1199 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1200 target->max_ti_iu_len,
1201 GFP_KERNEL, DMA_FROM_DEVICE);
1202 if (!target->rx_ring[i])
1203 goto err;
1204 }
1205
dd5e6e38 1206 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39 1207 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
74b0a15b 1208 srp_max_iu_len,
aef9ec39
RD		 1209 GFP_KERNEL, DMA_TO_DEVICE);
1210 if (!target->tx_ring[i])
1211 goto err;
dcb4cb85
BVA		 1212
1213 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1214 }
1215
1216 return 0;
1217
1218err:
1219 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1220 srp_free_iu(target->srp_host, target->rx_ring[i]);
1221 target->rx_ring[i] = NULL;
1222 }
1223
dd5e6e38 1224 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39
RD		 1225 srp_free_iu(target->srp_host, target->tx_ring[i]);
1226 target->tx_ring[i] = NULL;
1227 }
1228
1229 return -ENOMEM;
1230}
1231
1232static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1233 struct ib_cm_event *event,
1234 struct srp_target_port *target)
1235{
7aa54bd7 1236 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1237 struct ib_class_port_info *cpi;
1238 int opcode;
1239
1240 switch (event->param.rej_rcvd.reason) {
1241 case IB_CM_REJ_PORT_CM_REDIRECT:
1242 cpi = event->param.rej_rcvd.ari;
1243 target->path.dlid = cpi->redirect_lid;
1244 target->path.pkey = cpi->redirect_pkey;
1245 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1246 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1247
1248 target->status = target->path.dlid ?
1249 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1250 break;
1251
1252 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1253 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1254 /*
1255 * Topspin/Cisco SRP gateways incorrectly send
1256 * reject reason code 25 when they mean 24
1257 * (port redirect).
1258 */
1259 memcpy(target->path.dgid.raw,
1260 event->param.rej_rcvd.ari, 16);
1261
7aa54bd7
DD		 1262 shost_printk(KERN_DEBUG, shost,
1263 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1264 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1265 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1266
1267 target->status = SRP_PORT_REDIRECT;
1268 } else {
7aa54bd7
DD		 1269 shost_printk(KERN_WARNING, shost,
1270 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1271 target->status = -ECONNRESET;
1272 }
1273 break;
1274
1275 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1276 shost_printk(KERN_WARNING, shost,
1277 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1278 target->status = -ECONNRESET;
1279 break;
1280
1281 case IB_CM_REJ_CONSUMER_DEFINED:
1282 opcode = *(u8 *) event->private_data;
1283 if (opcode == SRP_LOGIN_REJ) {
1284 struct srp_login_rej *rej = event->private_data;
1285 u32 reason = be32_to_cpu(rej->reason);
1286
1287 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1288 shost_printk(KERN_WARNING, shost,
1289 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1290 else
7aa54bd7
DD		 1291 shost_printk(KERN_WARNING, shost,
1292 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
aef9ec39 1293 } else
7aa54bd7
DD		 1294 shost_printk(KERN_WARNING, shost,
1295 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1296 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1297 target->status = -ECONNRESET;
1298 break;
1299
9fe4bcf4
DD		 1300 case IB_CM_REJ_STALE_CONN:
1301 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1302 target->status = SRP_STALE_CONN;
1303 break;
1304
aef9ec39 1305 default:
7aa54bd7
DD		 1306 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1307 event->param.rej_rcvd.reason);
aef9ec39
RD		 1308 target->status = -ECONNRESET;
1309 }
1310}
1311
1312static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1313{
1314 struct srp_target_port *target = cm_id->context;
1315 struct ib_qp_attr *qp_attr = NULL;
1316 int attr_mask = 0;
1317 int comp = 0;
1318 int opcode = 0;
c996bb47 1319 int i;
aef9ec39
RD		 1320
1321 switch (event->event) {
1322 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1323 shost_printk(KERN_DEBUG, target->scsi_host,
1324 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1325 comp = 1;
1326 target->status = -ECONNRESET;
1327 break;
1328
1329 case IB_CM_REP_RECEIVED:
1330 comp = 1;
1331 opcode = *(u8 *) event->private_data;
1332
1333 if (opcode == SRP_LOGIN_RSP) {
1334 struct srp_login_rsp *rsp = event->private_data;
1335
1336 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1337 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1338
7ade400a
BVA		 1339 /*
1340 * Reserve credits for task management so we don't
1341 * bounce requests back to the SCSI mid-layer.
1342 */
1343 target->scsi_host->can_queue
1344 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1345 target->scsi_host->can_queue);
aef9ec39 1346 } else {
7aa54bd7
DD		 1347 shost_printk(KERN_WARNING, target->scsi_host,
1348 PFX "Unhandled RSP opcode %#x\n", opcode);
aef9ec39
RD		 1349 target->status = -ECONNRESET;
1350 break;
1351 }
1352
d2fcea7d
VP		 1353 if (!target->rx_ring[0]) {
1354 target->status = srp_alloc_iu_bufs(target);
1355 if (target->status)
1356 break;
1357 }
aef9ec39
RD		 1358
1359 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1360 if (!qp_attr) {
1361 target->status = -ENOMEM;
1362 break;
1363 }
1364
1365 qp_attr->qp_state = IB_QPS_RTR;
1366 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1367 if (target->status)
1368 break;
1369
1370 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1371 if (target->status)
1372 break;
1373
c996bb47 1374 for (i = 0; i < SRP_RQ_SIZE; i++) {
dcb4cb85
BVA		 1375 struct srp_iu *iu = target->rx_ring[i];
1376 target->status = srp_post_recv(target, iu);
c996bb47
BVA		 1377 if (target->status)
1378 break;
1379 }
aef9ec39
RD		 1380 if (target->status)
1381 break;
1382
1383 qp_attr->qp_state = IB_QPS_RTS;
1384 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1385 if (target->status)
1386 break;
1387
1388 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1389 if (target->status)
1390 break;
1391
1392 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1393 if (target->status)
1394 break;
1395
1396 break;
1397
1398 case IB_CM_REJ_RECEIVED:
7aa54bd7 1399 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1400 comp = 1;
1401
1402 srp_cm_rej_handler(cm_id, event, target);
1403 break;
1404
b7ac4ab4 1405 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1406 shost_printk(KERN_WARNING, target->scsi_host,
1407 PFX "DREQ received - connection closed\n");
b7ac4ab4 1408 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1409 shost_printk(KERN_ERR, target->scsi_host,
1410 PFX "Sending CM DREP failed\n");
aef9ec39
RD		 1411 break;
1412
1413 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1414 shost_printk(KERN_ERR, target->scsi_host,
1415 PFX "connection closed\n");
aef9ec39
RD		 1416
1417 comp = 1;
1418 target->status = 0;
1419 break;
1420
b7ac4ab4
IR		 1421 case IB_CM_MRA_RECEIVED:
1422 case IB_CM_DREQ_ERROR:
1423 case IB_CM_DREP_RECEIVED:
1424 break;
1425
aef9ec39 1426 default:
7aa54bd7
DD		 1427 shost_printk(KERN_WARNING, target->scsi_host,
1428 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1429 break;
1430 }
1431
1432 if (comp)
1433 complete(&target->done);
1434
1435 kfree(qp_attr);
1436
1437 return 0;
1438}
1439
d945e1df 1440static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 1441 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 1442{
19081f31 1443 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 1444 struct srp_iu *iu;
1445 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 1446
1285b3a0 1447 if (target->state == SRP_TARGET_DEAD ||
f8b6e31e 1448 target->state == SRP_TARGET_REMOVED)
76c75b25 1449 return -1;
1285b3a0 1450
f8b6e31e 1451 init_completion(&target->tsk_mgmt_done);
aef9ec39 1452
e9684678 1453 spin_lock_irq(&target->lock);
bb12588a 1454 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 1455 spin_unlock_irq(&target->lock);
76c75b25 1456
aef9ec39 1457 if (!iu)
76c75b25 1458 return -1;
aef9ec39 1459
19081f31
DD		 1460 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1461 DMA_TO_DEVICE);
aef9ec39
RD		 1462 tsk_mgmt = iu->buf;
1463 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1464
1465 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 1466 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1467 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 1468 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 1469 tsk_mgmt->task_tag = req_tag;
aef9ec39 1470
19081f31
DD		 1471 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1472 DMA_TO_DEVICE);
76c75b25
BVA		 1473 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
1474 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
1475 return -1;
1476 }
d945e1df 1477
f8b6e31e 1478 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 1479 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1480 return -1;
aef9ec39 1481
d945e1df 1482 return 0;
d945e1df
RD		 1483}
1484
aef9ec39
RD		 1485static int srp_abort(struct scsi_cmnd *scmnd)
1486{
d945e1df 1487 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 1488 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
d945e1df
RD		 1489 int ret = SUCCESS;
1490
7aa54bd7 1491 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 1492
f8b6e31e 1493 if (!req || target->qp_in_error)
d945e1df 1494 return FAILED;
f8b6e31e
DD		 1495 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
1496 SRP_TSK_ABORT_TASK))
d945e1df
RD		 1497 return FAILED;
1498
f8b6e31e
DD		 1499 if (req->scmnd) {
1500 if (!target->tsk_mgmt_status) {
94a9174c 1501 srp_remove_req(target, req, 0);
f8b6e31e
DD		 1502 scmnd->result = DID_ABORT << 16;
1503 } else
1504 ret = FAILED;
1505 }
d945e1df 1506
d945e1df 1507 return ret;
aef9ec39
RD		 1508}
1509
1510static int srp_reset_device(struct scsi_cmnd *scmnd)
1511{
d945e1df 1512 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 1513 int i;
d945e1df 1514
7aa54bd7 1515 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 1516
1033ff67
IR		 1517 if (target->qp_in_error)
1518 return FAILED;
f8b6e31e
DD		 1519 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
1520 SRP_TSK_LUN_RESET))
d945e1df 1521 return FAILED;
f8b6e31e 1522 if (target->tsk_mgmt_status)
d945e1df
RD		 1523 return FAILED;
1524
536ae14e
BVA		 1525 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1526 struct srp_request *req = &target->req_ring[i];
f8b6e31e 1527 if (req->scmnd && req->scmnd->device == scmnd->device)
526b4caa 1528 srp_reset_req(target, req);
536ae14e 1529 }
d945e1df 1530
d945e1df 1531 return SUCCESS;
aef9ec39
RD		 1532}
1533
1534static int srp_reset_host(struct scsi_cmnd *scmnd)
1535{
1536 struct srp_target_port *target = host_to_target(scmnd->device->host);
1537 int ret = FAILED;
1538
7aa54bd7 1539 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39
RD		 1540
1541 if (!srp_reconnect_target(target))
1542 ret = SUCCESS;
1543
1544 return ret;
1545}
1546
ee959b00
TJ		 1547static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1548 char *buf)
6ecb0c84 1549{
ee959b00 1550 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1551
1552 if (target->state == SRP_TARGET_DEAD ||
1553 target->state == SRP_TARGET_REMOVED)
1554 return -ENODEV;
1555
1556 return sprintf(buf, "0x%016llx\n",
1557 (unsigned long long) be64_to_cpu(target->id_ext));
1558}
1559
ee959b00
TJ		 1560static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1561 char *buf)
6ecb0c84 1562{
ee959b00 1563 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1564
1565 if (target->state == SRP_TARGET_DEAD ||
1566 target->state == SRP_TARGET_REMOVED)
1567 return -ENODEV;
1568
1569 return sprintf(buf, "0x%016llx\n",
1570 (unsigned long long) be64_to_cpu(target->ioc_guid));
1571}
1572
ee959b00
TJ		 1573static ssize_t show_service_id(struct device *dev,
1574 struct device_attribute *attr, char *buf)
6ecb0c84 1575{
ee959b00 1576 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1577
1578 if (target->state == SRP_TARGET_DEAD ||
1579 target->state == SRP_TARGET_REMOVED)
1580 return -ENODEV;
1581
1582 return sprintf(buf, "0x%016llx\n",
1583 (unsigned long long) be64_to_cpu(target->service_id));
1584}
1585
ee959b00
TJ		 1586static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1587 char *buf)
6ecb0c84 1588{
ee959b00 1589 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1590
1591 if (target->state == SRP_TARGET_DEAD ||
1592 target->state == SRP_TARGET_REMOVED)
1593 return -ENODEV;
1594
1595 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1596}
1597
ee959b00
TJ		 1598static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1599 char *buf)
6ecb0c84 1600{
ee959b00 1601 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1602
1603 if (target->state == SRP_TARGET_DEAD ||
1604 target->state == SRP_TARGET_REMOVED)
1605 return -ENODEV;
1606
5b095d98 1607 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 1608}
1609
ee959b00
TJ		 1610static ssize_t show_orig_dgid(struct device *dev,
1611 struct device_attribute *attr, char *buf)
3633b3d0 1612{
ee959b00 1613 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0
IR		 1614
1615 if (target->state == SRP_TARGET_DEAD ||
1616 target->state == SRP_TARGET_REMOVED)
1617 return -ENODEV;
1618
5b095d98 1619 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 1620}
1621
89de7486
BVA		 1622static ssize_t show_req_lim(struct device *dev,
1623 struct device_attribute *attr, char *buf)
1624{
1625 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1626
1627 if (target->state == SRP_TARGET_DEAD ||
1628 target->state == SRP_TARGET_REMOVED)
1629 return -ENODEV;
1630
1631 return sprintf(buf, "%d\n", target->req_lim);
1632}
1633
ee959b00
TJ		 1634static ssize_t show_zero_req_lim(struct device *dev,
1635 struct device_attribute *attr, char *buf)
6bfa24fa 1636{
ee959b00 1637 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa
RD		 1638
1639 if (target->state == SRP_TARGET_DEAD ||
1640 target->state == SRP_TARGET_REMOVED)
1641 return -ENODEV;
1642
1643 return sprintf(buf, "%d\n", target->zero_req_lim);
1644}
1645
ee959b00
TJ		 1646static ssize_t show_local_ib_port(struct device *dev,
1647 struct device_attribute *attr, char *buf)
ded7f1a1 1648{
ee959b00 1649 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 1650
1651 return sprintf(buf, "%d\n", target->srp_host->port);
1652}
1653
ee959b00
TJ		 1654static ssize_t show_local_ib_device(struct device *dev,
1655 struct device_attribute *attr, char *buf)
ded7f1a1 1656{
ee959b00 1657 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 1658
05321937 1659 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 1660}
1661
ee959b00
TJ		 1662static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1663static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1664static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1665static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1666static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1667static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 1668static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 1669static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1670static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1671static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1672
1673static struct device_attribute *srp_host_attrs[] = {
1674 &dev_attr_id_ext,
1675 &dev_attr_ioc_guid,
1676 &dev_attr_service_id,
1677 &dev_attr_pkey,
1678 &dev_attr_dgid,
1679 &dev_attr_orig_dgid,
89de7486 1680 &dev_attr_req_lim,
ee959b00
TJ		 1681 &dev_attr_zero_req_lim,
1682 &dev_attr_local_ib_port,
1683 &dev_attr_local_ib_device,
6ecb0c84
RD		 1684 NULL
1685};
1686
aef9ec39
RD		 1687static struct scsi_host_template srp_template = {
1688 .module = THIS_MODULE,
b7f008fd
RD		 1689 .name = "InfiniBand SRP initiator",
1690 .proc_name = DRV_NAME,
aef9ec39
RD		 1691 .info = srp_target_info,
1692 .queuecommand = srp_queuecommand,
1693 .eh_abort_handler = srp_abort,
1694 .eh_device_reset_handler = srp_reset_device,
1695 .eh_host_reset_handler = srp_reset_host,
dd5e6e38 1696 .can_queue = SRP_CMD_SQ_SIZE,
aef9ec39 1697 .this_id = -1,
dd5e6e38 1698 .cmd_per_lun = SRP_CMD_SQ_SIZE,
6ecb0c84
RD		 1699 .use_clustering = ENABLE_CLUSTERING,
1700 .shost_attrs = srp_host_attrs
aef9ec39
RD		 1701};
1702
1703static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1704{
3236822b
FT		 1705 struct srp_rport_identifiers ids;
1706 struct srp_rport *rport;
1707
aef9ec39
RD		 1708 sprintf(target->target_name, "SRP.T10:%016llX",
1709 (unsigned long long) be64_to_cpu(target->id_ext));
1710
05321937 1711 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 1712 return -ENODEV;
1713
3236822b
FT		 1714 memcpy(ids.port_id, &target->id_ext, 8);
1715 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 1716 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 1717 rport = srp_rport_add(target->scsi_host, &ids);
1718 if (IS_ERR(rport)) {
1719 scsi_remove_host(target->scsi_host);
1720 return PTR_ERR(rport);
1721 }
1722
b3589fd4 1723 spin_lock(&host->target_lock);
aef9ec39 1724 list_add_tail(&target->list, &host->target_list);
b3589fd4 1725 spin_unlock(&host->target_lock);
aef9ec39
RD		 1726
1727 target->state = SRP_TARGET_LIVE;
1728
aef9ec39 1729 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 1730 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 1731
1732 return 0;
1733}
1734
ee959b00 1735static void srp_release_dev(struct device *dev)
aef9ec39
RD		 1736{
1737 struct srp_host *host =
ee959b00 1738 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1739
1740 complete(&host->released);
1741}
1742
1743static struct class srp_class = {
1744 .name = "infiniband_srp",
ee959b00 1745 .dev_release = srp_release_dev
aef9ec39
RD		 1746};
1747
1748/*
1749 * Target ports are added by writing
1750 *
1751 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1752 * pkey=<P_Key>,service_id=<service ID>
1753 *
1754 * to the add_target sysfs attribute.
1755 */
1756enum {
1757 SRP_OPT_ERR = 0,
1758 SRP_OPT_ID_EXT = 1 << 0,
1759 SRP_OPT_IOC_GUID = 1 << 1,
1760 SRP_OPT_DGID = 1 << 2,
1761 SRP_OPT_PKEY = 1 << 3,
1762 SRP_OPT_SERVICE_ID = 1 << 4,
1763 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 1764 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 1765 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 1766 SRP_OPT_INITIATOR_EXT = 1 << 8,
aef9ec39
RD		 1767 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1768 SRP_OPT_IOC_GUID |
1769 SRP_OPT_DGID |
1770 SRP_OPT_PKEY |
1771 SRP_OPT_SERVICE_ID),
1772};
1773
a447c093 1774static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 1775 { SRP_OPT_ID_EXT, "id_ext=%s" },
1776 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1777 { SRP_OPT_DGID, "dgid=%s" },
1778 { SRP_OPT_PKEY, "pkey=%x" },
1779 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1780 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1781 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 1782 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 1783 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
52fb2b50 1784 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 1785};
1786
1787static int srp_parse_options(const char *buf, struct srp_target_port *target)
1788{
1789 char *options, *sep_opt;
1790 char *p;
1791 char dgid[3];
1792 substring_t args[MAX_OPT_ARGS];
1793 int opt_mask = 0;
1794 int token;
1795 int ret = -EINVAL;
1796 int i;
1797
1798 options = kstrdup(buf, GFP_KERNEL);
1799 if (!options)
1800 return -ENOMEM;
1801
1802 sep_opt = options;
1803 while ((p = strsep(&sep_opt, ",")) != NULL) {
1804 if (!*p)
1805 continue;
1806
1807 token = match_token(p, srp_opt_tokens, args);
1808 opt_mask |= token;
1809
1810 switch (token) {
1811 case SRP_OPT_ID_EXT:
1812 p = match_strdup(args);
a20f3a6d
IR		 1813 if (!p) {
1814 ret = -ENOMEM;
1815 goto out;
1816 }
aef9ec39
RD		 1817 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1818 kfree(p);
1819 break;
1820
1821 case SRP_OPT_IOC_GUID:
1822 p = match_strdup(args);
a20f3a6d
IR		 1823 if (!p) {
1824 ret = -ENOMEM;
1825 goto out;
1826 }
aef9ec39
RD		 1827 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1828 kfree(p);
1829 break;
1830
1831 case SRP_OPT_DGID:
1832 p = match_strdup(args);
a20f3a6d
IR		 1833 if (!p) {
1834 ret = -ENOMEM;
1835 goto out;
1836 }
aef9ec39
RD		 1837 if (strlen(p) != 32) {
1838 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
ce1823f0 1839 kfree(p);
aef9ec39
RD		 1840 goto out;
1841 }
1842
1843 for (i = 0; i < 16; ++i) {
1844 strlcpy(dgid, p + i * 2, 3);
1845 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1846 }
bf17c1c7 1847 kfree(p);
3633b3d0 1848 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 1849 break;
1850
1851 case SRP_OPT_PKEY:
1852 if (match_hex(args, &token)) {
1853 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1854 goto out;
1855 }
1856 target->path.pkey = cpu_to_be16(token);
1857 break;
1858
1859 case SRP_OPT_SERVICE_ID:
1860 p = match_strdup(args);
a20f3a6d
IR		 1861 if (!p) {
1862 ret = -ENOMEM;
1863 goto out;
1864 }
aef9ec39 1865 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 1866 target->path.service_id = target->service_id;
aef9ec39
RD		 1867 kfree(p);
1868 break;
1869
1870 case SRP_OPT_MAX_SECT:
1871 if (match_int(args, &token)) {
1872 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1873 goto out;
1874 }
1875 target->scsi_host->max_sectors = token;
1876 break;
1877
52fb2b50
VP		 1878 case SRP_OPT_MAX_CMD_PER_LUN:
1879 if (match_int(args, &token)) {
1880 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1881 goto out;
1882 }
dd5e6e38 1883 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
52fb2b50
VP		 1884 break;
1885
0c0450db
R		 1886 case SRP_OPT_IO_CLASS:
1887 if (match_hex(args, &token)) {
1888 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1889 goto out;
1890 }
1891 if (token != SRP_REV10_IB_IO_CLASS &&
1892 token != SRP_REV16A_IB_IO_CLASS) {
1893 printk(KERN_WARNING PFX "unknown IO class parameter value"
1894 " %x specified (use %x or %x).\n",
1895 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1896 goto out;
1897 }
1898 target->io_class = token;
1899 break;
1900
01cb9bcb
IR		 1901 case SRP_OPT_INITIATOR_EXT:
1902 p = match_strdup(args);
a20f3a6d
IR		 1903 if (!p) {
1904 ret = -ENOMEM;
1905 goto out;
1906 }
01cb9bcb
IR		 1907 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1908 kfree(p);
1909 break;
1910
aef9ec39
RD		 1911 default:
1912 printk(KERN_WARNING PFX "unknown parameter or missing value "
1913 "'%s' in target creation request\n", p);
1914 goto out;
1915 }
1916 }
1917
1918 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1919 ret = 0;
1920 else
1921 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1922 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1923 !(srp_opt_tokens[i].token & opt_mask))
1924 printk(KERN_WARNING PFX "target creation request is "
1925 "missing parameter '%s'\n",
1926 srp_opt_tokens[i].pattern);
1927
1928out:
1929 kfree(options);
1930 return ret;
1931}
1932
ee959b00
TJ		 1933static ssize_t srp_create_target(struct device *dev,
1934 struct device_attribute *attr,
aef9ec39
RD		 1935 const char *buf, size_t count)
1936{
1937 struct srp_host *host =
ee959b00 1938 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1939 struct Scsi_Host *target_host;
1940 struct srp_target_port *target;
1941 int ret;
1942 int i;
1943
1944 target_host = scsi_host_alloc(&srp_template,
1945 sizeof (struct srp_target_port));
1946 if (!target_host)
1947 return -ENOMEM;
1948
3236822b 1949 target_host->transportt = ib_srp_transport_template;
3c8edf0e
AR		 1950 target_host->max_lun = SRP_MAX_LUN;
1951 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 1952
aef9ec39 1953 target = host_to_target(target_host);
aef9ec39 1954
0c0450db 1955 target->io_class = SRP_REV16A_IB_IO_CLASS;
aef9ec39
RD		 1956 target->scsi_host = target_host;
1957 target->srp_host = host;
1958
e9684678 1959 spin_lock_init(&target->lock);
dcb4cb85 1960 INIT_LIST_HEAD(&target->free_tx);
d945e1df 1961 INIT_LIST_HEAD(&target->free_reqs);
dd5e6e38 1962 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
d945e1df
RD		 1963 target->req_ring[i].index = i;
1964 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1965 }
aef9ec39
RD		 1966
1967 ret = srp_parse_options(buf, target);
1968 if (ret)
1969 goto err;
1970
969a60f9 1971 ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
aef9ec39 1972
7aa54bd7
DD		 1973 shost_printk(KERN_DEBUG, target->scsi_host, PFX
1974 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
5b095d98 1975 "service_id %016llx dgid %pI6\n",
aef9ec39
RD		 1976 (unsigned long long) be64_to_cpu(target->id_ext),
1977 (unsigned long long) be64_to_cpu(target->ioc_guid),
1978 be16_to_cpu(target->path.pkey),
1979 (unsigned long long) be64_to_cpu(target->service_id),
8867cd7c 1980 target->path.dgid.raw);
aef9ec39
RD		 1981
1982 ret = srp_create_target_ib(target);
1983 if (ret)
1984 goto err;
1985
9fe4bcf4
DD		 1986 ret = srp_new_cm_id(target);
1987 if (ret)
aef9ec39 1988 goto err_free;
aef9ec39 1989
1033ff67 1990 target->qp_in_error = 0;
aef9ec39
RD		 1991 ret = srp_connect_target(target);
1992 if (ret) {
7aa54bd7
DD		 1993 shost_printk(KERN_ERR, target->scsi_host,
1994 PFX "Connection failed\n");
aef9ec39
RD		 1995 goto err_cm_id;
1996 }
1997
1998 ret = srp_add_target(host, target);
1999 if (ret)
2000 goto err_disconnect;
2001
2002 return count;
2003
2004err_disconnect:
2005 srp_disconnect_target(target);
2006
2007err_cm_id:
2008 ib_destroy_cm_id(target->cm_id);
2009
2010err_free:
2011 srp_free_target_ib(target);
2012
2013err:
2014 scsi_host_put(target_host);
2015
2016 return ret;
2017}
2018
ee959b00 2019static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2020
ee959b00
TJ		 2021static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2022 char *buf)
aef9ec39 2023{
ee959b00 2024 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2025
05321937 2026 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2027}
2028
ee959b00 2029static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2030
ee959b00
TJ		 2031static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2032 char *buf)
aef9ec39 2033{
ee959b00 2034 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2035
2036 return sprintf(buf, "%d\n", host->port);
2037}
2038
ee959b00 2039static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2040
f5358a17 2041static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2042{
2043 struct srp_host *host;
2044
2045 host = kzalloc(sizeof *host, GFP_KERNEL);
2046 if (!host)
2047 return NULL;
2048
2049 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2050 spin_lock_init(&host->target_lock);
aef9ec39 2051 init_completion(&host->released);
05321937 2052 host->srp_dev = device;
aef9ec39
RD		 2053 host->port = port;
2054
ee959b00
TJ		 2055 host->dev.class = &srp_class;
2056 host->dev.parent = device->dev->dma_device;
d927e38c 2057 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2058
ee959b00 2059 if (device_register(&host->dev))
f5358a17 2060 goto free_host;
ee959b00 2061 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2062 goto err_class;
ee959b00 2063 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2064 goto err_class;
ee959b00 2065 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2066 goto err_class;
2067
2068 return host;
2069
2070err_class:
ee959b00 2071 device_unregister(&host->dev);
aef9ec39 2072
f5358a17 2073free_host:
aef9ec39
RD		 2074 kfree(host);
2075
2076 return NULL;
2077}
2078
2079static void srp_add_one(struct ib_device *device)
2080{
f5358a17
RD		 2081 struct srp_device *srp_dev;
2082 struct ib_device_attr *dev_attr;
2083 struct ib_fmr_pool_param fmr_param;
aef9ec39 2084 struct srp_host *host;
aef9ec39
RD		 2085 int s, e, p;
2086
f5358a17
RD		 2087 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2088 if (!dev_attr)
cf311cd4 2089 return;
aef9ec39 2090
f5358a17
RD		 2091 if (ib_query_device(device, dev_attr)) {
2092 printk(KERN_WARNING PFX "Query device failed for %s\n",
2093 device->name);
2094 goto free_attr;
2095 }
2096
2097 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2098 if (!srp_dev)
2099 goto free_attr;
2100
2101 /*
2102 * Use the smallest page size supported by the HCA, down to a
2103 * minimum of 512 bytes (which is the smallest sector that a
2104 * SCSI command will ever carry).
2105 */
2106 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2107 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
bf628dc2 2108 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
f5358a17
RD		 2109
2110 INIT_LIST_HEAD(&srp_dev->dev_list);
2111
2112 srp_dev->dev = device;
2113 srp_dev->pd = ib_alloc_pd(device);
2114 if (IS_ERR(srp_dev->pd))
2115 goto free_dev;
2116
2117 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2118 IB_ACCESS_LOCAL_WRITE |
2119 IB_ACCESS_REMOTE_READ |
2120 IB_ACCESS_REMOTE_WRITE);
2121 if (IS_ERR(srp_dev->mr))
2122 goto err_pd;
2123
2124 memset(&fmr_param, 0, sizeof fmr_param);
2125 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2126 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2127 fmr_param.cache = 1;
2128 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2129 fmr_param.page_shift = srp_dev->fmr_page_shift;
2130 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2131 IB_ACCESS_REMOTE_WRITE |
2132 IB_ACCESS_REMOTE_READ);
2133
2134 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2135 if (IS_ERR(srp_dev->fmr_pool))
2136 srp_dev->fmr_pool = NULL;
aef9ec39 2137
07ebafba 2138 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2139 s = 0;
2140 e = 0;
2141 } else {
2142 s = 1;
2143 e = device->phys_port_cnt;
2144 }
2145
2146 for (p = s; p <= e; ++p) {
f5358a17 2147 host = srp_add_port(srp_dev, p);
aef9ec39 2148 if (host)
f5358a17 2149 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2150 }
2151
f5358a17
RD		 2152 ib_set_client_data(device, &srp_client, srp_dev);
2153
2154 goto free_attr;
2155
2156err_pd:
2157 ib_dealloc_pd(srp_dev->pd);
2158
2159free_dev:
2160 kfree(srp_dev);
2161
2162free_attr:
2163 kfree(dev_attr);
aef9ec39
RD		 2164}
2165
2166static void srp_remove_one(struct ib_device *device)
2167{
f5358a17 2168 struct srp_device *srp_dev;
aef9ec39
RD		 2169 struct srp_host *host, *tmp_host;
2170 LIST_HEAD(target_list);
2171 struct srp_target_port *target, *tmp_target;
aef9ec39 2172
f5358a17 2173 srp_dev = ib_get_client_data(device, &srp_client);
aef9ec39 2174
f5358a17 2175 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2176 device_unregister(&host->dev);
aef9ec39
RD		 2177 /*
2178 * Wait for the sysfs entry to go away, so that no new
2179 * target ports can be created.
2180 */
2181 wait_for_completion(&host->released);
2182
2183 /*
2184 * Mark all target ports as removed, so we stop queueing
2185 * commands and don't try to reconnect.
2186 */
b3589fd4 2187 spin_lock(&host->target_lock);
549c5fc2 2188 list_for_each_entry(target, &host->target_list, list) {
e9684678 2189 spin_lock_irq(&target->lock);
0c5b3952 2190 target->state = SRP_TARGET_REMOVED;
e9684678 2191 spin_unlock_irq(&target->lock);
aef9ec39 2192 }
b3589fd4 2193 spin_unlock(&host->target_lock);
aef9ec39
RD		 2194
2195 /*
2196 * Wait for any reconnection tasks that may have
2197 * started before we marked our target ports as
2198 * removed, and any target port removal tasks.
2199 */
2200 flush_scheduled_work();
2201
2202 list_for_each_entry_safe(target, tmp_target,
2203 &host->target_list, list) {
b0e47c8b 2204 srp_remove_host(target->scsi_host);
ad696989 2205 scsi_remove_host(target->scsi_host);
aef9ec39
RD		 2206 srp_disconnect_target(target);
2207 ib_destroy_cm_id(target->cm_id);
2208 srp_free_target_ib(target);
2209 scsi_host_put(target->scsi_host);
2210 }
2211
aef9ec39
RD		 2212 kfree(host);
2213 }
2214
f5358a17
RD		 2215 if (srp_dev->fmr_pool)
2216 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2217 ib_dereg_mr(srp_dev->mr);
2218 ib_dealloc_pd(srp_dev->pd);
2219
2220 kfree(srp_dev);
aef9ec39
RD		 2221}
2222
3236822b
FT		 2223static struct srp_function_template ib_srp_transport_functions = {
2224};
2225
aef9ec39
RD		 2226static int __init srp_init_module(void)
2227{
2228 int ret;
2229
dcb4cb85 2230 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 2231
1e89a194
DD		 2232 if (srp_sg_tablesize > 255) {
2233 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2234 srp_sg_tablesize = 255;
2235 }
2236
3236822b
FT		 2237 ib_srp_transport_template =
2238 srp_attach_transport(&ib_srp_transport_functions);
2239 if (!ib_srp_transport_template)
2240 return -ENOMEM;
2241
74b0a15b
VP		 2242 srp_template.sg_tablesize = srp_sg_tablesize;
2243 srp_max_iu_len = (sizeof (struct srp_cmd) +
2244 sizeof (struct srp_indirect_buf) +
2245 srp_sg_tablesize * 16);
2246
aef9ec39
RD		 2247 ret = class_register(&srp_class);
2248 if (ret) {
2249 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
3236822b 2250 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2251 return ret;
2252 }
2253
c1a0b23b
MT		 2254 ib_sa_register_client(&srp_sa_client);
2255
aef9ec39
RD		 2256 ret = ib_register_client(&srp_client);
2257 if (ret) {
2258 printk(KERN_ERR PFX "couldn't register IB client\n");
3236822b 2259 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2260 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2261 class_unregister(&srp_class);
2262 return ret;
2263 }
2264
2265 return 0;
2266}
2267
2268static void __exit srp_cleanup_module(void)
2269{
2270 ib_unregister_client(&srp_client);
c1a0b23b 2271 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 2272 class_unregister(&srp_class);
3236822b 2273 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2274}
2275
2276module_init(srp_init_module);
2277module_exit(srp_cleanup_module);
Linux kernel - Deliverables
This page took 0.6084 seconds and 5 git commands to generate.