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IB/srp: Add periodic reconnect functionality
[mirror_ubuntu-artful-kernel.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
e0bda7d8
BVA		 33#define pr_fmt(fmt) PFX fmt
34
aef9ec39
RD		 35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/string.h>
40#include <linux/parser.h>
41#include <linux/random.h>
de25968c 42#include <linux/jiffies.h>
aef9ec39 43
60063497 44#include <linux/atomic.h>
aef9ec39
RD		 45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/srp.h>
3236822b 50#include <scsi/scsi_transport_srp.h>
aef9ec39 51
aef9ec39
RD		 52#include "ib_srp.h"
53
54#define DRV_NAME "ib_srp"
55#define PFX DRV_NAME ": "
e8ca4135
VP		 56#define DRV_VERSION "1.0"
57#define DRV_RELDATE "July 1, 2013"
aef9ec39
RD		 58
59MODULE_AUTHOR("Roland Dreier");
60MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
61 "v" DRV_VERSION " (" DRV_RELDATE ")");
62MODULE_LICENSE("Dual BSD/GPL");
63
49248644
DD		 64static unsigned int srp_sg_tablesize;
65static unsigned int cmd_sg_entries;
c07d424d
DD		 66static unsigned int indirect_sg_entries;
67static bool allow_ext_sg;
49248644 68static int topspin_workarounds = 1;
74b0a15b 69
49248644
DD		 70module_param(srp_sg_tablesize, uint, 0444);
71MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
74b0a15b 72
49248644
DD		 73module_param(cmd_sg_entries, uint, 0444);
74MODULE_PARM_DESC(cmd_sg_entries,
75 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
aef9ec39 76
c07d424d
DD		 77module_param(indirect_sg_entries, uint, 0444);
78MODULE_PARM_DESC(indirect_sg_entries,
79 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
80
81module_param(allow_ext_sg, bool, 0444);
82MODULE_PARM_DESC(allow_ext_sg,
83 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
84
aef9ec39
RD		 85module_param(topspin_workarounds, int, 0444);
86MODULE_PARM_DESC(topspin_workarounds,
87 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
88
ed9b2264
BVA		 89static struct kernel_param_ops srp_tmo_ops;
90
a95cadb9
BVA		 91static int srp_reconnect_delay = 10;
92module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
93 S_IRUGO | S_IWUSR);
94MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
95
ed9b2264
BVA		 96static int srp_fast_io_fail_tmo = 15;
97module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
98 S_IRUGO | S_IWUSR);
99MODULE_PARM_DESC(fast_io_fail_tmo,
100 "Number of seconds between the observation of a transport"
101 " layer error and failing all I/O. \"off\" means that this"
102 " functionality is disabled.");
103
a95cadb9 104static int srp_dev_loss_tmo = 600;
ed9b2264
BVA		 105module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
106 S_IRUGO | S_IWUSR);
107MODULE_PARM_DESC(dev_loss_tmo,
108 "Maximum number of seconds that the SRP transport should"
109 " insulate transport layer errors. After this time has been"
110 " exceeded the SCSI host is removed. Should be"
111 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
112 " if fast_io_fail_tmo has not been set. \"off\" means that"
113 " this functionality is disabled.");
114
aef9ec39
RD		 115static void srp_add_one(struct ib_device *device);
116static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 117static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
118static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 119static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
120
3236822b
FT		 121static struct scsi_transport_template *ib_srp_transport_template;
122
aef9ec39
RD		 123static struct ib_client srp_client = {
124 .name = "srp",
125 .add = srp_add_one,
126 .remove = srp_remove_one
127};
128
c1a0b23b
MT		 129static struct ib_sa_client srp_sa_client;
130
ed9b2264
BVA		 131static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
132{
133 int tmo = *(int *)kp->arg;
134
135 if (tmo >= 0)
136 return sprintf(buffer, "%d", tmo);
137 else
138 return sprintf(buffer, "off");
139}
140
141static int srp_tmo_set(const char *val, const struct kernel_param *kp)
142{
143 int tmo, res;
144
145 if (strncmp(val, "off", 3) != 0) {
146 res = kstrtoint(val, 0, &tmo);
147 if (res)
148 goto out;
149 } else {
150 tmo = -1;
151 }
a95cadb9
BVA		 152 if (kp->arg == &srp_reconnect_delay)
153 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
154 srp_dev_loss_tmo);
155 else if (kp->arg == &srp_fast_io_fail_tmo)
156 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
ed9b2264 157 else
a95cadb9
BVA		 158 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
159 tmo);
ed9b2264
BVA		 160 if (res)
161 goto out;
162 *(int *)kp->arg = tmo;
163
164out:
165 return res;
166}
167
168static struct kernel_param_ops srp_tmo_ops = {
169 .get = srp_tmo_get,
170 .set = srp_tmo_set,
171};
172
aef9ec39
RD		 173static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
174{
175 return (struct srp_target_port *) host->hostdata;
176}
177
178static const char *srp_target_info(struct Scsi_Host *host)
179{
180 return host_to_target(host)->target_name;
181}
182
5d7cbfd6
RD		 183static int srp_target_is_topspin(struct srp_target_port *target)
184{
185 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 186 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 187
188 return topspin_workarounds &&
3d1ff48d
RK		 189 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
190 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 191}
192
aef9ec39
RD		 193static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
194 gfp_t gfp_mask,
195 enum dma_data_direction direction)
196{
197 struct srp_iu *iu;
198
199 iu = kmalloc(sizeof *iu, gfp_mask);
200 if (!iu)
201 goto out;
202
203 iu->buf = kzalloc(size, gfp_mask);
204 if (!iu->buf)
205 goto out_free_iu;
206
05321937
GKH		 207 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
208 direction);
209 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 210 goto out_free_buf;
211
212 iu->size = size;
213 iu->direction = direction;
214
215 return iu;
216
217out_free_buf:
218 kfree(iu->buf);
219out_free_iu:
220 kfree(iu);
221out:
222 return NULL;
223}
224
225static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
226{
227 if (!iu)
228 return;
229
05321937
GKH		 230 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
231 iu->direction);
aef9ec39
RD		 232 kfree(iu->buf);
233 kfree(iu);
234}
235
236static void srp_qp_event(struct ib_event *event, void *context)
237{
e0bda7d8 238 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 239}
240
241static int srp_init_qp(struct srp_target_port *target,
242 struct ib_qp *qp)
243{
244 struct ib_qp_attr *attr;
245 int ret;
246
247 attr = kmalloc(sizeof *attr, GFP_KERNEL);
248 if (!attr)
249 return -ENOMEM;
250
969a60f9
RD		 251 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
252 target->srp_host->port,
253 be16_to_cpu(target->path.pkey),
254 &attr->pkey_index);
aef9ec39
RD		 255 if (ret)
256 goto out;
257
258 attr->qp_state = IB_QPS_INIT;
259 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
260 IB_ACCESS_REMOTE_WRITE);
261 attr->port_num = target->srp_host->port;
262
263 ret = ib_modify_qp(qp, attr,
264 IB_QP_STATE |
265 IB_QP_PKEY_INDEX |
266 IB_QP_ACCESS_FLAGS |
267 IB_QP_PORT);
268
269out:
270 kfree(attr);
271 return ret;
272}
273
9fe4bcf4
DD		 274static int srp_new_cm_id(struct srp_target_port *target)
275{
276 struct ib_cm_id *new_cm_id;
277
05321937 278 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 279 srp_cm_handler, target);
280 if (IS_ERR(new_cm_id))
281 return PTR_ERR(new_cm_id);
282
283 if (target->cm_id)
284 ib_destroy_cm_id(target->cm_id);
285 target->cm_id = new_cm_id;
286
287 return 0;
288}
289
aef9ec39
RD		 290static int srp_create_target_ib(struct srp_target_port *target)
291{
292 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 293 struct ib_cq *recv_cq, *send_cq;
294 struct ib_qp *qp;
aef9ec39
RD		 295 int ret;
296
297 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
298 if (!init_attr)
299 return -ENOMEM;
300
73aa89ed 301 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
4b5e5f41
BVA		 302 srp_recv_completion, NULL, target, SRP_RQ_SIZE,
303 target->comp_vector);
73aa89ed
IR		 304 if (IS_ERR(recv_cq)) {
305 ret = PTR_ERR(recv_cq);
da9d2f07 306 goto err;
aef9ec39
RD		 307 }
308
73aa89ed 309 send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
4b5e5f41
BVA		 310 srp_send_completion, NULL, target, SRP_SQ_SIZE,
311 target->comp_vector);
73aa89ed
IR		 312 if (IS_ERR(send_cq)) {
313 ret = PTR_ERR(send_cq);
da9d2f07 314 goto err_recv_cq;
9c03dc9f
BVA		 315 }
316
73aa89ed 317 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 318
319 init_attr->event_handler = srp_qp_event;
320 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
321 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
322 init_attr->cap.max_recv_sge = 1;
323 init_attr->cap.max_send_sge = 1;
324 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
325 init_attr->qp_type = IB_QPT_RC;
73aa89ed
IR		 326 init_attr->send_cq = send_cq;
327 init_attr->recv_cq = recv_cq;
aef9ec39 328
73aa89ed
IR		 329 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
330 if (IS_ERR(qp)) {
331 ret = PTR_ERR(qp);
da9d2f07 332 goto err_send_cq;
aef9ec39
RD		 333 }
334
73aa89ed 335 ret = srp_init_qp(target, qp);
da9d2f07
RD		 336 if (ret)
337 goto err_qp;
aef9ec39 338
73aa89ed
IR		 339 if (target->qp)
340 ib_destroy_qp(target->qp);
341 if (target->recv_cq)
342 ib_destroy_cq(target->recv_cq);
343 if (target->send_cq)
344 ib_destroy_cq(target->send_cq);
345
346 target->qp = qp;
347 target->recv_cq = recv_cq;
348 target->send_cq = send_cq;
349
da9d2f07
RD		 350 kfree(init_attr);
351 return 0;
352
353err_qp:
73aa89ed 354 ib_destroy_qp(qp);
da9d2f07
RD		 355
356err_send_cq:
73aa89ed 357 ib_destroy_cq(send_cq);
da9d2f07
RD		 358
359err_recv_cq:
73aa89ed 360 ib_destroy_cq(recv_cq);
da9d2f07
RD		 361
362err:
aef9ec39
RD		 363 kfree(init_attr);
364 return ret;
365}
366
367static void srp_free_target_ib(struct srp_target_port *target)
368{
369 int i;
370
371 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 372 ib_destroy_cq(target->send_cq);
373 ib_destroy_cq(target->recv_cq);
aef9ec39 374
73aa89ed
IR		 375 target->qp = NULL;
376 target->send_cq = target->recv_cq = NULL;
377
aef9ec39
RD		 378 for (i = 0; i < SRP_RQ_SIZE; ++i)
379 srp_free_iu(target->srp_host, target->rx_ring[i]);
dd5e6e38 380 for (i = 0; i < SRP_SQ_SIZE; ++i)
aef9ec39
RD		 381 srp_free_iu(target->srp_host, target->tx_ring[i]);
382}
383
384static void srp_path_rec_completion(int status,
385 struct ib_sa_path_rec *pathrec,
386 void *target_ptr)
387{
388 struct srp_target_port *target = target_ptr;
389
390 target->status = status;
391 if (status)
7aa54bd7
DD		 392 shost_printk(KERN_ERR, target->scsi_host,
393 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 394 else
395 target->path = *pathrec;
396 complete(&target->done);
397}
398
399static int srp_lookup_path(struct srp_target_port *target)
400{
401 target->path.numb_path = 1;
402
403 init_completion(&target->done);
404
c1a0b23b 405 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 406 target->srp_host->srp_dev->dev,
aef9ec39
RD		 407 target->srp_host->port,
408 &target->path,
247e020e 409 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 410 IB_SA_PATH_REC_DGID |
411 IB_SA_PATH_REC_SGID |
412 IB_SA_PATH_REC_NUMB_PATH |
413 IB_SA_PATH_REC_PKEY,
414 SRP_PATH_REC_TIMEOUT_MS,
415 GFP_KERNEL,
416 srp_path_rec_completion,
417 target, &target->path_query);
418 if (target->path_query_id < 0)
419 return target->path_query_id;
420
421 wait_for_completion(&target->done);
422
423 if (target->status < 0)
7aa54bd7
DD		 424 shost_printk(KERN_WARNING, target->scsi_host,
425 PFX "Path record query failed\n");
aef9ec39
RD		 426
427 return target->status;
428}
429
430static int srp_send_req(struct srp_target_port *target)
431{
432 struct {
433 struct ib_cm_req_param param;
434 struct srp_login_req priv;
435 } *req = NULL;
436 int status;
437
438 req = kzalloc(sizeof *req, GFP_KERNEL);
439 if (!req)
440 return -ENOMEM;
441
442 req->param.primary_path = &target->path;
443 req->param.alternate_path = NULL;
444 req->param.service_id = target->service_id;
445 req->param.qp_num = target->qp->qp_num;
446 req->param.qp_type = target->qp->qp_type;
447 req->param.private_data = &req->priv;
448 req->param.private_data_len = sizeof req->priv;
449 req->param.flow_control = 1;
450
451 get_random_bytes(&req->param.starting_psn, 4);
452 req->param.starting_psn &= 0xffffff;
453
454 /*
455 * Pick some arbitrary defaults here; we could make these
456 * module parameters if anyone cared about setting them.
457 */
458 req->param.responder_resources = 4;
459 req->param.remote_cm_response_timeout = 20;
460 req->param.local_cm_response_timeout = 20;
7bb312e4 461 req->param.retry_count = target->tl_retry_count;
aef9ec39
RD		 462 req->param.rnr_retry_count = 7;
463 req->param.max_cm_retries = 15;
464
465 req->priv.opcode = SRP_LOGIN_REQ;
466 req->priv.tag = 0;
49248644 467 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 468 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
469 SRP_BUF_FORMAT_INDIRECT);
0c0450db 470 /*
3cd96564 471 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 472 * port identifier format is 8 bytes of ID extension followed
473 * by 8 bytes of GUID. Older drafts put the two halves in the
474 * opposite order, so that the GUID comes first.
475 *
476 * Targets conforming to these obsolete drafts can be
477 * recognized by the I/O Class they report.
478 */
479 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
480 memcpy(req->priv.initiator_port_id,
01cb9bcb 481 &target->path.sgid.global.interface_id, 8);
0c0450db 482 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 483 &target->initiator_ext, 8);
0c0450db
R		 484 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
485 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
486 } else {
487 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 488 &target->initiator_ext, 8);
489 memcpy(req->priv.initiator_port_id + 8,
490 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 491 memcpy(req->priv.target_port_id, &target->id_ext, 8);
492 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
493 }
494
aef9ec39
RD		 495 /*
496 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 497 * zero out the first 8 bytes of our initiator port ID and set
498 * the second 8 bytes to the local node GUID.
aef9ec39 499 */
5d7cbfd6 500 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 501 shost_printk(KERN_DEBUG, target->scsi_host,
502 PFX "Topspin/Cisco initiator port ID workaround "
503 "activated for target GUID %016llx\n",
504 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 505 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 506 memcpy(req->priv.initiator_port_id + 8,
05321937 507 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 508 }
aef9ec39
RD		 509
510 status = ib_send_cm_req(target->cm_id, &req->param);
511
512 kfree(req);
513
514 return status;
515}
516
ef6c49d8
BVA		 517static bool srp_queue_remove_work(struct srp_target_port *target)
518{
519 bool changed = false;
520
521 spin_lock_irq(&target->lock);
522 if (target->state != SRP_TARGET_REMOVED) {
523 target->state = SRP_TARGET_REMOVED;
524 changed = true;
525 }
526 spin_unlock_irq(&target->lock);
527
528 if (changed)
529 queue_work(system_long_wq, &target->remove_work);
530
531 return changed;
532}
533
294c875a
BVA		 534static bool srp_change_conn_state(struct srp_target_port *target,
535 bool connected)
536{
537 bool changed = false;
538
539 spin_lock_irq(&target->lock);
540 if (target->connected != connected) {
541 target->connected = connected;
542 changed = true;
543 }
544 spin_unlock_irq(&target->lock);
545
546 return changed;
547}
548
aef9ec39
RD		 549static void srp_disconnect_target(struct srp_target_port *target)
550{
294c875a
BVA		 551 if (srp_change_conn_state(target, false)) {
552 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 553
294c875a
BVA		 554 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
555 shost_printk(KERN_DEBUG, target->scsi_host,
556 PFX "Sending CM DREQ failed\n");
294c875a 557 }
e6581056 558 }
aef9ec39
RD		 559}
560
8f26c9ff
DD		 561static void srp_free_req_data(struct srp_target_port *target)
562{
c07d424d 563 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
8f26c9ff
DD		 564 struct srp_request *req;
565 int i;
566
567 for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
568 kfree(req->fmr_list);
569 kfree(req->map_page);
c07d424d
DD		 570 if (req->indirect_dma_addr) {
571 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
572 target->indirect_size,
573 DMA_TO_DEVICE);
574 }
575 kfree(req->indirect_desc);
8f26c9ff
DD		 576 }
577}
578
683b159a
BVA		 579/**
580 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
581 * @shost: SCSI host whose attributes to remove from sysfs.
582 *
583 * Note: Any attributes defined in the host template and that did not exist
584 * before invocation of this function will be ignored.
585 */
586static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
587{
588 struct device_attribute **attr;
589
590 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
591 device_remove_file(&shost->shost_dev, *attr);
592}
593
ee12d6a8
BVA		 594static void srp_remove_target(struct srp_target_port *target)
595{
ef6c49d8
BVA		 596 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
597
ee12d6a8 598 srp_del_scsi_host_attr(target->scsi_host);
9dd69a60 599 srp_rport_get(target->rport);
ee12d6a8
BVA		 600 srp_remove_host(target->scsi_host);
601 scsi_remove_host(target->scsi_host);
ef6c49d8 602 srp_disconnect_target(target);
ee12d6a8
BVA		 603 ib_destroy_cm_id(target->cm_id);
604 srp_free_target_ib(target);
c1120f89 605 cancel_work_sync(&target->tl_err_work);
9dd69a60 606 srp_rport_put(target->rport);
ee12d6a8
BVA		 607 srp_free_req_data(target);
608 scsi_host_put(target->scsi_host);
609}
610
c4028958 611static void srp_remove_work(struct work_struct *work)
aef9ec39 612{
c4028958 613 struct srp_target_port *target =
ef6c49d8 614 container_of(work, struct srp_target_port, remove_work);
aef9ec39 615
ef6c49d8 616 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 617
96fc248a
BVA		 618 srp_remove_target(target);
619
b3589fd4 620 spin_lock(&target->srp_host->target_lock);
aef9ec39 621 list_del(&target->list);
b3589fd4 622 spin_unlock(&target->srp_host->target_lock);
aef9ec39
RD		 623}
624
dc1bdbd9
BVA		 625static void srp_rport_delete(struct srp_rport *rport)
626{
627 struct srp_target_port *target = rport->lld_data;
628
629 srp_queue_remove_work(target);
630}
631
aef9ec39
RD		 632static int srp_connect_target(struct srp_target_port *target)
633{
9fe4bcf4 634 int retries = 3;
aef9ec39
RD		 635 int ret;
636
294c875a
BVA		 637 WARN_ON_ONCE(target->connected);
638
948d1e88
BVA		 639 target->qp_in_error = false;
640
aef9ec39
RD		 641 ret = srp_lookup_path(target);
642 if (ret)
643 return ret;
644
645 while (1) {
646 init_completion(&target->done);
647 ret = srp_send_req(target);
648 if (ret)
649 return ret;
650 wait_for_completion(&target->done);
651
652 /*
653 * The CM event handling code will set status to
654 * SRP_PORT_REDIRECT if we get a port redirect REJ
655 * back, or SRP_DLID_REDIRECT if we get a lid/qp
656 * redirect REJ back.
657 */
658 switch (target->status) {
659 case 0:
294c875a 660 srp_change_conn_state(target, true);
aef9ec39
RD		 661 return 0;
662
663 case SRP_PORT_REDIRECT:
664 ret = srp_lookup_path(target);
665 if (ret)
666 return ret;
667 break;
668
669 case SRP_DLID_REDIRECT:
670 break;
671
9fe4bcf4
DD		 672 case SRP_STALE_CONN:
673 /* Our current CM id was stale, and is now in timewait.
674 * Try to reconnect with a new one.
675 */
676 if (!retries-- || srp_new_cm_id(target)) {
677 shost_printk(KERN_ERR, target->scsi_host, PFX
678 "giving up on stale connection\n");
679 target->status = -ECONNRESET;
680 return target->status;
681 }
682
683 shost_printk(KERN_ERR, target->scsi_host, PFX
684 "retrying stale connection\n");
685 break;
686
aef9ec39
RD		 687 default:
688 return target->status;
689 }
690 }
691}
692
d945e1df
RD		 693static void srp_unmap_data(struct scsi_cmnd *scmnd,
694 struct srp_target_port *target,
695 struct srp_request *req)
696{
8f26c9ff
DD		 697 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
698 struct ib_pool_fmr **pfmr;
699
bb350d1d 700 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 701 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
702 scmnd->sc_data_direction != DMA_FROM_DEVICE))
703 return;
704
8f26c9ff
DD		 705 pfmr = req->fmr_list;
706 while (req->nfmr--)
707 ib_fmr_pool_unmap(*pfmr++);
f5358a17 708
8f26c9ff
DD		 709 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
710 scmnd->sc_data_direction);
d945e1df
RD		 711}
712
22032991
BVA		 713/**
714 * srp_claim_req - Take ownership of the scmnd associated with a request.
715 * @target: SRP target port.
716 * @req: SRP request.
717 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
718 * ownership of @req->scmnd if it equals @scmnd.
719 *
720 * Return value:
721 * Either NULL or a pointer to the SCSI command the caller became owner of.
722 */
723static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
724 struct srp_request *req,
725 struct scsi_cmnd *scmnd)
726{
727 unsigned long flags;
728
729 spin_lock_irqsave(&target->lock, flags);
730 if (!scmnd) {
731 scmnd = req->scmnd;
732 req->scmnd = NULL;
733 } else if (req->scmnd == scmnd) {
734 req->scmnd = NULL;
735 } else {
736 scmnd = NULL;
737 }
738 spin_unlock_irqrestore(&target->lock, flags);
739
740 return scmnd;
741}
742
743/**
744 * srp_free_req() - Unmap data and add request to the free request list.
745 */
746static void srp_free_req(struct srp_target_port *target,
747 struct srp_request *req, struct scsi_cmnd *scmnd,
748 s32 req_lim_delta)
526b4caa 749{
94a9174c
BVA		 750 unsigned long flags;
751
22032991
BVA		 752 srp_unmap_data(scmnd, target, req);
753
e9684678 754 spin_lock_irqsave(&target->lock, flags);
94a9174c 755 target->req_lim += req_lim_delta;
536ae14e 756 list_add_tail(&req->list, &target->free_reqs);
e9684678 757 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 758}
759
ed9b2264
BVA		 760static void srp_finish_req(struct srp_target_port *target,
761 struct srp_request *req, int result)
526b4caa 762{
22032991
BVA		 763 struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
764
765 if (scmnd) {
9b796d06 766 srp_free_req(target, req, scmnd, 0);
ed9b2264 767 scmnd->result = result;
22032991 768 scmnd->scsi_done(scmnd);
22032991 769 }
526b4caa
IR		 770}
771
ed9b2264 772static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 773{
ed9b2264
BVA		 774 struct srp_target_port *target = rport->lld_data;
775 int i;
776
777 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
778 struct srp_request *req = &target->req_ring[i];
779 srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16);
780 }
781}
aef9ec39 782
ed9b2264
BVA		 783/*
784 * It is up to the caller to ensure that srp_rport_reconnect() calls are
785 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
786 * srp_reset_device() or srp_reset_host() calls will occur while this function
787 * is in progress. One way to realize that is not to call this function
788 * directly but to call srp_reconnect_rport() instead since that last function
789 * serializes calls of this function via rport->mutex and also blocks
790 * srp_queuecommand() calls before invoking this function.
791 */
792static int srp_rport_reconnect(struct srp_rport *rport)
793{
794 struct srp_target_port *target = rport->lld_data;
795 int i, ret;
09be70a2 796
aef9ec39
RD		 797 srp_disconnect_target(target);
798 /*
c7c4e7ff
BVA		 799 * Now get a new local CM ID so that we avoid confusing the target in
800 * case things are really fouled up. Doing so also ensures that all CM
801 * callbacks will have finished before a new QP is allocated.
aef9ec39 802 */
9fe4bcf4 803 ret = srp_new_cm_id(target);
c7c4e7ff
BVA		 804 /*
805 * Whether or not creating a new CM ID succeeded, create a new
806 * QP. This guarantees that all completion callback function
807 * invocations have finished before request resetting starts.
808 */
809 if (ret == 0)
810 ret = srp_create_target_ib(target);
811 else
812 srp_create_target_ib(target);
aef9ec39 813
536ae14e
BVA		 814 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
815 struct srp_request *req = &target->req_ring[i];
ed9b2264 816 srp_finish_req(target, req, DID_RESET << 16);
536ae14e 817 }
aef9ec39 818
536ae14e 819 INIT_LIST_HEAD(&target->free_tx);
dcb4cb85 820 for (i = 0; i < SRP_SQ_SIZE; ++i)
536ae14e 821 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 822
c7c4e7ff
BVA		 823 if (ret == 0)
824 ret = srp_connect_target(target);
09be70a2 825
ed9b2264
BVA		 826 if (ret == 0)
827 shost_printk(KERN_INFO, target->scsi_host,
828 PFX "reconnect succeeded\n");
aef9ec39
RD		 829
830 return ret;
831}
832
8f26c9ff
DD		 833static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
834 unsigned int dma_len, u32 rkey)
f5358a17 835{
8f26c9ff 836 struct srp_direct_buf *desc = state->desc;
f5358a17 837
8f26c9ff
DD		 838 desc->va = cpu_to_be64(dma_addr);
839 desc->key = cpu_to_be32(rkey);
840 desc->len = cpu_to_be32(dma_len);
f5358a17 841
8f26c9ff
DD		 842 state->total_len += dma_len;
843 state->desc++;
844 state->ndesc++;
845}
559ce8f1 846
8f26c9ff
DD		 847static int srp_map_finish_fmr(struct srp_map_state *state,
848 struct srp_target_port *target)
849{
850 struct srp_device *dev = target->srp_host->srp_dev;
851 struct ib_pool_fmr *fmr;
852 u64 io_addr = 0;
85507bcc 853
8f26c9ff
DD		 854 if (!state->npages)
855 return 0;
f5358a17 856
8f26c9ff
DD		 857 if (state->npages == 1) {
858 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
859 target->rkey);
860 state->npages = state->fmr_len = 0;
861 return 0;
f5358a17
RD		 862 }
863
8f26c9ff
DD		 864 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
865 state->npages, io_addr);
866 if (IS_ERR(fmr))
867 return PTR_ERR(fmr);
f5358a17 868
8f26c9ff
DD		 869 *state->next_fmr++ = fmr;
870 state->nfmr++;
f5358a17 871
8f26c9ff
DD		 872 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
873 state->npages = state->fmr_len = 0;
874 return 0;
875}
876
877static void srp_map_update_start(struct srp_map_state *state,
878 struct scatterlist *sg, int sg_index,
879 dma_addr_t dma_addr)
880{
881 state->unmapped_sg = sg;
882 state->unmapped_index = sg_index;
883 state->unmapped_addr = dma_addr;
884}
85507bcc 885
8f26c9ff
DD		 886static int srp_map_sg_entry(struct srp_map_state *state,
887 struct srp_target_port *target,
888 struct scatterlist *sg, int sg_index,
889 int use_fmr)
890{
891 struct srp_device *dev = target->srp_host->srp_dev;
892 struct ib_device *ibdev = dev->dev;
893 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
894 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
895 unsigned int len;
896 int ret;
897
898 if (!dma_len)
899 return 0;
900
901 if (use_fmr == SRP_MAP_NO_FMR) {
902 /* Once we're in direct map mode for a request, we don't
903 * go back to FMR mode, so no need to update anything
904 * other than the descriptor.
905 */
906 srp_map_desc(state, dma_addr, dma_len, target->rkey);
907 return 0;
85507bcc 908 }
f5358a17 909
8f26c9ff
DD		 910 /* If we start at an offset into the FMR page, don't merge into
911 * the current FMR. Finish it out, and use the kernel's MR for this
912 * sg entry. This is to avoid potential bugs on some SRP targets
913 * that were never quite defined, but went away when the initiator
914 * avoided using FMR on such page fragments.
915 */
916 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
917 ret = srp_map_finish_fmr(state, target);
918 if (ret)
919 return ret;
920
921 srp_map_desc(state, dma_addr, dma_len, target->rkey);
922 srp_map_update_start(state, NULL, 0, 0);
923 return 0;
f5358a17
RD		 924 }
925
8f26c9ff
DD		 926 /* If this is the first sg to go into the FMR, save our position.
927 * We need to know the first unmapped entry, its index, and the
928 * first unmapped address within that entry to be able to restart
929 * mapping after an error.
930 */
931 if (!state->unmapped_sg)
932 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 933
8f26c9ff
DD		 934 while (dma_len) {
935 if (state->npages == SRP_FMR_SIZE) {
936 ret = srp_map_finish_fmr(state, target);
937 if (ret)
938 return ret;
f5358a17 939
8f26c9ff
DD		 940 srp_map_update_start(state, sg, sg_index, dma_addr);
941 }
942
943 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
f5358a17 944
8f26c9ff
DD		 945 if (!state->npages)
946 state->base_dma_addr = dma_addr;
947 state->pages[state->npages++] = dma_addr;
948 state->fmr_len += len;
949 dma_addr += len;
950 dma_len -= len;
951 }
952
953 /* If the last entry of the FMR wasn't a full page, then we need to
954 * close it out and start a new one -- we can only merge at page
955 * boundries.
956 */
957 ret = 0;
958 if (len != dev->fmr_page_size) {
959 ret = srp_map_finish_fmr(state, target);
960 if (!ret)
961 srp_map_update_start(state, NULL, 0, 0);
962 }
f5358a17
RD		 963 return ret;
964}
965
aef9ec39
RD		 966static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
967 struct srp_request *req)
968{
8f26c9ff 969 struct scatterlist *scat, *sg;
aef9ec39 970 struct srp_cmd *cmd = req->cmd->buf;
8f26c9ff 971 int i, len, nents, count, use_fmr;
85507bcc
RC		 972 struct srp_device *dev;
973 struct ib_device *ibdev;
8f26c9ff
DD		 974 struct srp_map_state state;
975 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 976 u32 table_len;
977 u8 fmt;
aef9ec39 978
bb350d1d 979 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 980 return sizeof (struct srp_cmd);
981
982 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
983 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 984 shost_printk(KERN_WARNING, target->scsi_host,
985 PFX "Unhandled data direction %d\n",
986 scmnd->sc_data_direction);
aef9ec39
RD		 987 return -EINVAL;
988 }
989
bb350d1d
FT		 990 nents = scsi_sg_count(scmnd);
991 scat = scsi_sglist(scmnd);
aef9ec39 992
05321937 993 dev = target->srp_host->srp_dev;
85507bcc
RC		 994 ibdev = dev->dev;
995
996 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 997 if (unlikely(count == 0))
998 return -EIO;
f5358a17
RD		 999
1000 fmt = SRP_DATA_DESC_DIRECT;
1001 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1002
cf368713 1003 if (count == 1) {
f5358a17
RD		 1004 /*
1005 * The midlayer only generated a single gather/scatter
1006 * entry, or DMA mapping coalesced everything to a
1007 * single entry. So a direct descriptor along with
1008 * the DMA MR suffices.
1009 */
cf368713 1010 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1011
85507bcc 1012 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1013 buf->key = cpu_to_be32(target->rkey);
85507bcc 1014 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff
DD		 1015
1016 req->nfmr = 0;
1017 goto map_complete;
1018 }
1019
1020 /* We have more than one scatter/gather entry, so build our indirect
1021 * descriptor table, trying to merge as many entries with FMR as we
1022 * can.
1023 */
1024 indirect_hdr = (void *) cmd->add_data;
1025
c07d424d
DD		 1026 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1027 target->indirect_size, DMA_TO_DEVICE);
1028
8f26c9ff 1029 memset(&state, 0, sizeof(state));
c07d424d 1030 state.desc = req->indirect_desc;
8f26c9ff
DD		 1031 state.pages = req->map_page;
1032 state.next_fmr = req->fmr_list;
1033
1034 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
1035
1036 for_each_sg(scat, sg, count, i) {
1037 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
1038 /* FMR mapping failed, so backtrack to the first
1039 * unmapped entry and continue on without using FMR.
1040 */
1041 dma_addr_t dma_addr;
1042 unsigned int dma_len;
1043
1044backtrack:
1045 sg = state.unmapped_sg;
1046 i = state.unmapped_index;
1047
1048 dma_addr = ib_sg_dma_address(ibdev, sg);
1049 dma_len = ib_sg_dma_len(ibdev, sg);
1050 dma_len -= (state.unmapped_addr - dma_addr);
1051 dma_addr = state.unmapped_addr;
1052 use_fmr = SRP_MAP_NO_FMR;
1053 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
f5358a17 1054 }
8f26c9ff 1055 }
aef9ec39 1056
8f26c9ff
DD		 1057 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
1058 goto backtrack;
cf368713 1059
c07d424d
DD		 1060 /* We've mapped the request, now pull as much of the indirect
1061 * descriptor table as we can into the command buffer. If this
1062 * target is not using an external indirect table, we are
1063 * guaranteed to fit into the command, as the SCSI layer won't
1064 * give us more S/G entries than we allow.
8f26c9ff
DD		 1065 */
1066 req->nfmr = state.nfmr;
1067 if (state.ndesc == 1) {
1068 /* FMR mapping was able to collapse this to one entry,
1069 * so use a direct descriptor.
1070 */
1071 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1072
c07d424d 1073 *buf = req->indirect_desc[0];
8f26c9ff 1074 goto map_complete;
aef9ec39
RD		 1075 }
1076
c07d424d
DD		 1077 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1078 !target->allow_ext_sg)) {
1079 shost_printk(KERN_ERR, target->scsi_host,
1080 "Could not fit S/G list into SRP_CMD\n");
1081 return -EIO;
1082 }
1083
1084 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1085 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1086
1087 fmt = SRP_DATA_DESC_INDIRECT;
1088 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1089 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1090
c07d424d
DD		 1091 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1092 count * sizeof (struct srp_direct_buf));
8f26c9ff 1093
c07d424d 1094 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1095 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1096 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1097 indirect_hdr->len = cpu_to_be32(state.total_len);
1098
1099 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1100 cmd->data_out_desc_cnt = count;
8f26c9ff 1101 else
c07d424d
DD		 1102 cmd->data_in_desc_cnt = count;
1103
1104 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1105 DMA_TO_DEVICE);
8f26c9ff
DD		 1106
1107map_complete:
aef9ec39
RD		 1108 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1109 cmd->buf_fmt = fmt << 4;
1110 else
1111 cmd->buf_fmt = fmt;
1112
aef9ec39
RD		 1113 return len;
1114}
1115
76c75b25
BVA		 1116/*
1117 * Return an IU and possible credit to the free pool
1118 */
1119static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1120 enum srp_iu_type iu_type)
1121{
1122 unsigned long flags;
1123
e9684678 1124 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1125 list_add(&iu->list, &target->free_tx);
1126 if (iu_type != SRP_IU_RSP)
1127 ++target->req_lim;
e9684678 1128 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1129}
1130
05a1d750 1131/*
e9684678
BVA		 1132 * Must be called with target->lock held to protect req_lim and free_tx.
1133 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1134 *
1135 * Note:
1136 * An upper limit for the number of allocated information units for each
1137 * request type is:
1138 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1139 * more than Scsi_Host.can_queue requests.
1140 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1141 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1142 * one unanswered SRP request to an initiator.
1143 */
1144static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1145 enum srp_iu_type iu_type)
1146{
1147 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1148 struct srp_iu *iu;
1149
1150 srp_send_completion(target->send_cq, target);
1151
dcb4cb85 1152 if (list_empty(&target->free_tx))
05a1d750
DD		 1153 return NULL;
1154
1155 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1156 if (iu_type != SRP_IU_RSP) {
1157 if (target->req_lim <= rsv) {
1158 ++target->zero_req_lim;
1159 return NULL;
1160 }
1161
1162 --target->req_lim;
05a1d750
DD		 1163 }
1164
dcb4cb85 1165 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1166 list_del(&iu->list);
05a1d750
DD		 1167 return iu;
1168}
1169
76c75b25
BVA		 1170static int srp_post_send(struct srp_target_port *target,
1171 struct srp_iu *iu, int len)
05a1d750
DD		 1172{
1173 struct ib_sge list;
1174 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1175
1176 list.addr = iu->dma;
1177 list.length = len;
9af76271 1178 list.lkey = target->lkey;
05a1d750
DD		 1179
1180 wr.next = NULL;
dcb4cb85 1181 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1182 wr.sg_list = &list;
1183 wr.num_sge = 1;
1184 wr.opcode = IB_WR_SEND;
1185 wr.send_flags = IB_SEND_SIGNALED;
1186
76c75b25 1187 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1188}
1189
dcb4cb85 1190static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1191{
c996bb47 1192 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1193 struct ib_sge list;
c996bb47
BVA		 1194
1195 list.addr = iu->dma;
1196 list.length = iu->size;
9af76271 1197 list.lkey = target->lkey;
c996bb47
BVA		 1198
1199 wr.next = NULL;
dcb4cb85 1200 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1201 wr.sg_list = &list;
1202 wr.num_sge = 1;
1203
dcb4cb85 1204 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1205}
1206
aef9ec39
RD		 1207static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1208{
1209 struct srp_request *req;
1210 struct scsi_cmnd *scmnd;
1211 unsigned long flags;
aef9ec39 1212
aef9ec39 1213 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1214 spin_lock_irqsave(&target->lock, flags);
94a9174c 1215 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1216 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1217
f8b6e31e
DD		 1218 target->tsk_mgmt_status = -1;
1219 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1220 target->tsk_mgmt_status = rsp->data[3];
1221 complete(&target->tsk_mgmt_done);
aef9ec39 1222 } else {
f8b6e31e 1223 req = &target->req_ring[rsp->tag];
22032991
BVA		 1224 scmnd = srp_claim_req(target, req, NULL);
1225 if (!scmnd) {
7aa54bd7
DD		 1226 shost_printk(KERN_ERR, target->scsi_host,
1227 "Null scmnd for RSP w/tag %016llx\n",
1228 (unsigned long long) rsp->tag);
22032991
BVA		 1229
1230 spin_lock_irqsave(&target->lock, flags);
1231 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1232 spin_unlock_irqrestore(&target->lock, flags);
1233
1234 return;
1235 }
aef9ec39
RD		 1236 scmnd->result = rsp->status;
1237
1238 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1239 memcpy(scmnd->sense_buffer, rsp->data +
1240 be32_to_cpu(rsp->resp_data_len),
1241 min_t(int, be32_to_cpu(rsp->sense_data_len),
1242 SCSI_SENSE_BUFFERSIZE));
1243 }
1244
1245 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1246 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1247 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1248 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1249
22032991
BVA		 1250 srp_free_req(target, req, scmnd,
1251 be32_to_cpu(rsp->req_lim_delta));
1252
f8b6e31e
DD		 1253 scmnd->host_scribble = NULL;
1254 scmnd->scsi_done(scmnd);
aef9ec39 1255 }
aef9ec39
RD		 1256}
1257
bb12588a
DD		 1258static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1259 void *rsp, int len)
1260{
76c75b25 1261 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1262 unsigned long flags;
1263 struct srp_iu *iu;
76c75b25 1264 int err;
bb12588a 1265
e9684678 1266 spin_lock_irqsave(&target->lock, flags);
bb12588a 1267 target->req_lim += req_delta;
bb12588a 1268 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1269 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1270
bb12588a
DD		 1271 if (!iu) {
1272 shost_printk(KERN_ERR, target->scsi_host, PFX
1273 "no IU available to send response\n");
76c75b25 1274 return 1;
bb12588a
DD		 1275 }
1276
1277 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1278 memcpy(iu->buf, rsp, len);
1279 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1280
76c75b25
BVA		 1281 err = srp_post_send(target, iu, len);
1282 if (err) {
bb12588a
DD		 1283 shost_printk(KERN_ERR, target->scsi_host, PFX
1284 "unable to post response: %d\n", err);
76c75b25
BVA		 1285 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1286 }
bb12588a 1287
bb12588a
DD		 1288 return err;
1289}
1290
1291static void srp_process_cred_req(struct srp_target_port *target,
1292 struct srp_cred_req *req)
1293{
1294 struct srp_cred_rsp rsp = {
1295 .opcode = SRP_CRED_RSP,
1296 .tag = req->tag,
1297 };
1298 s32 delta = be32_to_cpu(req->req_lim_delta);
1299
1300 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1301 shost_printk(KERN_ERR, target->scsi_host, PFX
1302 "problems processing SRP_CRED_REQ\n");
1303}
1304
1305static void srp_process_aer_req(struct srp_target_port *target,
1306 struct srp_aer_req *req)
1307{
1308 struct srp_aer_rsp rsp = {
1309 .opcode = SRP_AER_RSP,
1310 .tag = req->tag,
1311 };
1312 s32 delta = be32_to_cpu(req->req_lim_delta);
1313
1314 shost_printk(KERN_ERR, target->scsi_host, PFX
1315 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1316
1317 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1318 shost_printk(KERN_ERR, target->scsi_host, PFX
1319 "problems processing SRP_AER_REQ\n");
1320}
1321
aef9ec39
RD		 1322static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1323{
dcb4cb85 1324 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1325 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1326 int res;
aef9ec39
RD		 1327 u8 opcode;
1328
85507bcc
RC		 1329 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1330 DMA_FROM_DEVICE);
aef9ec39
RD		 1331
1332 opcode = *(u8 *) iu->buf;
1333
1334 if (0) {
7aa54bd7
DD		 1335 shost_printk(KERN_ERR, target->scsi_host,
1336 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1337 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1338 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1339 }
1340
1341 switch (opcode) {
1342 case SRP_RSP:
1343 srp_process_rsp(target, iu->buf);
1344 break;
1345
bb12588a
DD		 1346 case SRP_CRED_REQ:
1347 srp_process_cred_req(target, iu->buf);
1348 break;
1349
1350 case SRP_AER_REQ:
1351 srp_process_aer_req(target, iu->buf);
1352 break;
1353
aef9ec39
RD		 1354 case SRP_T_LOGOUT:
1355 /* XXX Handle target logout */
7aa54bd7
DD		 1356 shost_printk(KERN_WARNING, target->scsi_host,
1357 PFX "Got target logout request\n");
aef9ec39
RD		 1358 break;
1359
1360 default:
7aa54bd7
DD		 1361 shost_printk(KERN_WARNING, target->scsi_host,
1362 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1363 break;
1364 }
1365
85507bcc
RC		 1366 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1367 DMA_FROM_DEVICE);
c996bb47 1368
dcb4cb85 1369 res = srp_post_recv(target, iu);
c996bb47
BVA		 1370 if (res != 0)
1371 shost_printk(KERN_ERR, target->scsi_host,
1372 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1373}
1374
c1120f89
BVA		 1375/**
1376 * srp_tl_err_work() - handle a transport layer error
1377 *
1378 * Note: This function may get invoked before the rport has been created,
1379 * hence the target->rport test.
1380 */
1381static void srp_tl_err_work(struct work_struct *work)
1382{
1383 struct srp_target_port *target;
1384
1385 target = container_of(work, struct srp_target_port, tl_err_work);
1386 if (target->rport)
1387 srp_start_tl_fail_timers(target->rport);
1388}
1389
948d1e88
BVA		 1390static void srp_handle_qp_err(enum ib_wc_status wc_status,
1391 enum ib_wc_opcode wc_opcode,
1392 struct srp_target_port *target)
1393{
294c875a 1394 if (target->connected && !target->qp_in_error) {
4f0af697
BVA		 1395 shost_printk(KERN_ERR, target->scsi_host,
1396 PFX "failed %s status %d\n",
1397 wc_opcode & IB_WC_RECV ? "receive" : "send",
1398 wc_status);
c1120f89 1399 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1400 }
948d1e88
BVA		 1401 target->qp_in_error = true;
1402}
1403
9c03dc9f 1404static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1405{
1406 struct srp_target_port *target = target_ptr;
1407 struct ib_wc wc;
aef9ec39
RD		 1408
1409 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1410 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1411 if (likely(wc.status == IB_WC_SUCCESS)) {
1412 srp_handle_recv(target, &wc);
1413 } else {
1414 srp_handle_qp_err(wc.status, wc.opcode, target);
aef9ec39 1415 }
9c03dc9f
BVA		 1416 }
1417}
1418
1419static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1420{
1421 struct srp_target_port *target = target_ptr;
1422 struct ib_wc wc;
dcb4cb85 1423 struct srp_iu *iu;
9c03dc9f
BVA		 1424
1425 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1426 if (likely(wc.status == IB_WC_SUCCESS)) {
1427 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1428 list_add(&iu->list, &target->free_tx);
1429 } else {
1430 srp_handle_qp_err(wc.status, wc.opcode, target);
9c03dc9f 1431 }
aef9ec39
RD		 1432 }
1433}
1434
76c75b25 1435static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1436{
76c75b25 1437 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1438 struct srp_rport *rport = target->rport;
aef9ec39
RD		 1439 struct srp_request *req;
1440 struct srp_iu *iu;
1441 struct srp_cmd *cmd;
85507bcc 1442 struct ib_device *dev;
76c75b25 1443 unsigned long flags;
ed9b2264 1444 int len, result;
a95cadb9
BVA		 1445 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1446
1447 /*
1448 * The SCSI EH thread is the only context from which srp_queuecommand()
1449 * can get invoked for blocked devices (SDEV_BLOCK /
1450 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1451 * locking the rport mutex if invoked from inside the SCSI EH.
1452 */
1453 if (in_scsi_eh)
1454 mutex_lock(&rport->mutex);
aef9ec39 1455
ed9b2264
BVA		 1456 result = srp_chkready(target->rport);
1457 if (unlikely(result)) {
1458 scmnd->result = result;
2ce19e72 1459 scmnd->scsi_done(scmnd);
a95cadb9 1460 goto unlock_rport;
2ce19e72
BVA		 1461 }
1462
e9684678 1463 spin_lock_irqsave(&target->lock, flags);
bb12588a 1464 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1465 if (!iu)
695b8349
BVA		 1466 goto err_unlock;
1467
1468 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1469 list_del(&req->list);
1470 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1471
05321937 1472 dev = target->srp_host->srp_dev->dev;
49248644 1473 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1474 DMA_TO_DEVICE);
aef9ec39 1475
aef9ec39 1476 scmnd->result = 0;
f8b6e31e 1477 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1478
1479 cmd = iu->buf;
1480 memset(cmd, 0, sizeof *cmd);
1481
1482 cmd->opcode = SRP_CMD;
1483 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1484 cmd->tag = req->index;
aef9ec39
RD		 1485 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1486
aef9ec39
RD		 1487 req->scmnd = scmnd;
1488 req->cmd = iu;
aef9ec39
RD		 1489
1490 len = srp_map_data(scmnd, target, req);
1491 if (len < 0) {
7aa54bd7
DD		 1492 shost_printk(KERN_ERR, target->scsi_host,
1493 PFX "Failed to map data\n");
76c75b25 1494 goto err_iu;
aef9ec39
RD		 1495 }
1496
49248644 1497 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1498 DMA_TO_DEVICE);
aef9ec39 1499
76c75b25 1500 if (srp_post_send(target, iu, len)) {
7aa54bd7 1501 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1502 goto err_unmap;
1503 }
1504
a95cadb9
BVA		 1505unlock_rport:
1506 if (in_scsi_eh)
1507 mutex_unlock(&rport->mutex);
1508
aef9ec39
RD		 1509 return 0;
1510
1511err_unmap:
1512 srp_unmap_data(scmnd, target, req);
1513
76c75b25
BVA		 1514err_iu:
1515 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1516
e9684678 1517 spin_lock_irqsave(&target->lock, flags);
76c75b25 1518 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1519
1520err_unlock:
e9684678 1521 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1522
a95cadb9
BVA		 1523 if (in_scsi_eh)
1524 mutex_unlock(&rport->mutex);
1525
aef9ec39
RD		 1526 return SCSI_MLQUEUE_HOST_BUSY;
1527}
1528
1529static int srp_alloc_iu_bufs(struct srp_target_port *target)
1530{
1531 int i;
1532
1533 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1534 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1535 target->max_ti_iu_len,
1536 GFP_KERNEL, DMA_FROM_DEVICE);
1537 if (!target->rx_ring[i])
1538 goto err;
1539 }
1540
dd5e6e38 1541 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39 1542 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1543 target->max_iu_len,
aef9ec39
RD		 1544 GFP_KERNEL, DMA_TO_DEVICE);
1545 if (!target->tx_ring[i])
1546 goto err;
dcb4cb85
BVA		 1547
1548 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1549 }
1550
1551 return 0;
1552
1553err:
1554 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1555 srp_free_iu(target->srp_host, target->rx_ring[i]);
1556 target->rx_ring[i] = NULL;
1557 }
1558
dd5e6e38 1559 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39
RD		 1560 srp_free_iu(target->srp_host, target->tx_ring[i]);
1561 target->tx_ring[i] = NULL;
1562 }
1563
1564 return -ENOMEM;
1565}
1566
c9b03c1a
BVA		 1567static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1568{
1569 uint64_t T_tr_ns, max_compl_time_ms;
1570 uint32_t rq_tmo_jiffies;
1571
1572 /*
1573 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1574 * table 91), both the QP timeout and the retry count have to be set
1575 * for RC QP's during the RTR to RTS transition.
1576 */
1577 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1578 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1579
1580 /*
1581 * Set target->rq_tmo_jiffies to one second more than the largest time
1582 * it can take before an error completion is generated. See also
1583 * C9-140..142 in the IBTA spec for more information about how to
1584 * convert the QP Local ACK Timeout value to nanoseconds.
1585 */
1586 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1587 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1588 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1589 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1590
1591 return rq_tmo_jiffies;
1592}
1593
961e0be8
DD		 1594static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1595 struct srp_login_rsp *lrsp,
1596 struct srp_target_port *target)
1597{
1598 struct ib_qp_attr *qp_attr = NULL;
1599 int attr_mask = 0;
1600 int ret;
1601 int i;
1602
1603 if (lrsp->opcode == SRP_LOGIN_RSP) {
1604 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1605 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1606
1607 /*
1608 * Reserve credits for task management so we don't
1609 * bounce requests back to the SCSI mid-layer.
1610 */
1611 target->scsi_host->can_queue
1612 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1613 target->scsi_host->can_queue);
1614 } else {
1615 shost_printk(KERN_WARNING, target->scsi_host,
1616 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1617 ret = -ECONNRESET;
1618 goto error;
1619 }
1620
1621 if (!target->rx_ring[0]) {
1622 ret = srp_alloc_iu_bufs(target);
1623 if (ret)
1624 goto error;
1625 }
1626
1627 ret = -ENOMEM;
1628 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1629 if (!qp_attr)
1630 goto error;
1631
1632 qp_attr->qp_state = IB_QPS_RTR;
1633 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1634 if (ret)
1635 goto error_free;
1636
1637 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1638 if (ret)
1639 goto error_free;
1640
1641 for (i = 0; i < SRP_RQ_SIZE; i++) {
1642 struct srp_iu *iu = target->rx_ring[i];
1643 ret = srp_post_recv(target, iu);
1644 if (ret)
1645 goto error_free;
1646 }
1647
1648 qp_attr->qp_state = IB_QPS_RTS;
1649 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1650 if (ret)
1651 goto error_free;
1652
c9b03c1a
BVA		 1653 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1654
961e0be8
DD		 1655 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1656 if (ret)
1657 goto error_free;
1658
1659 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1660
1661error_free:
1662 kfree(qp_attr);
1663
1664error:
1665 target->status = ret;
1666}
1667
aef9ec39
RD		 1668static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1669 struct ib_cm_event *event,
1670 struct srp_target_port *target)
1671{
7aa54bd7 1672 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1673 struct ib_class_port_info *cpi;
1674 int opcode;
1675
1676 switch (event->param.rej_rcvd.reason) {
1677 case IB_CM_REJ_PORT_CM_REDIRECT:
1678 cpi = event->param.rej_rcvd.ari;
1679 target->path.dlid = cpi->redirect_lid;
1680 target->path.pkey = cpi->redirect_pkey;
1681 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1682 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1683
1684 target->status = target->path.dlid ?
1685 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1686 break;
1687
1688 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1689 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1690 /*
1691 * Topspin/Cisco SRP gateways incorrectly send
1692 * reject reason code 25 when they mean 24
1693 * (port redirect).
1694 */
1695 memcpy(target->path.dgid.raw,
1696 event->param.rej_rcvd.ari, 16);
1697
7aa54bd7
DD		 1698 shost_printk(KERN_DEBUG, shost,
1699 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1700 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1701 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1702
1703 target->status = SRP_PORT_REDIRECT;
1704 } else {
7aa54bd7
DD		 1705 shost_printk(KERN_WARNING, shost,
1706 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1707 target->status = -ECONNRESET;
1708 }
1709 break;
1710
1711 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1712 shost_printk(KERN_WARNING, shost,
1713 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1714 target->status = -ECONNRESET;
1715 break;
1716
1717 case IB_CM_REJ_CONSUMER_DEFINED:
1718 opcode = *(u8 *) event->private_data;
1719 if (opcode == SRP_LOGIN_REJ) {
1720 struct srp_login_rej *rej = event->private_data;
1721 u32 reason = be32_to_cpu(rej->reason);
1722
1723 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1724 shost_printk(KERN_WARNING, shost,
1725 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1726 else
7aa54bd7
DD		 1727 shost_printk(KERN_WARNING, shost,
1728 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
aef9ec39 1729 } else
7aa54bd7
DD		 1730 shost_printk(KERN_WARNING, shost,
1731 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1732 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1733 target->status = -ECONNRESET;
1734 break;
1735
9fe4bcf4
DD		 1736 case IB_CM_REJ_STALE_CONN:
1737 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1738 target->status = SRP_STALE_CONN;
1739 break;
1740
aef9ec39 1741 default:
7aa54bd7
DD		 1742 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1743 event->param.rej_rcvd.reason);
aef9ec39
RD		 1744 target->status = -ECONNRESET;
1745 }
1746}
1747
1748static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1749{
1750 struct srp_target_port *target = cm_id->context;
aef9ec39 1751 int comp = 0;
aef9ec39
RD		 1752
1753 switch (event->event) {
1754 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1755 shost_printk(KERN_DEBUG, target->scsi_host,
1756 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1757 comp = 1;
1758 target->status = -ECONNRESET;
1759 break;
1760
1761 case IB_CM_REP_RECEIVED:
1762 comp = 1;
961e0be8 1763 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 1764 break;
1765
1766 case IB_CM_REJ_RECEIVED:
7aa54bd7 1767 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1768 comp = 1;
1769
1770 srp_cm_rej_handler(cm_id, event, target);
1771 break;
1772
b7ac4ab4 1773 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1774 shost_printk(KERN_WARNING, target->scsi_host,
1775 PFX "DREQ received - connection closed\n");
294c875a 1776 srp_change_conn_state(target, false);
b7ac4ab4 1777 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1778 shost_printk(KERN_ERR, target->scsi_host,
1779 PFX "Sending CM DREP failed\n");
c1120f89 1780 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 1781 break;
1782
1783 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1784 shost_printk(KERN_ERR, target->scsi_host,
1785 PFX "connection closed\n");
aef9ec39 1786
aef9ec39
RD		 1787 target->status = 0;
1788 break;
1789
b7ac4ab4
IR		 1790 case IB_CM_MRA_RECEIVED:
1791 case IB_CM_DREQ_ERROR:
1792 case IB_CM_DREP_RECEIVED:
1793 break;
1794
aef9ec39 1795 default:
7aa54bd7
DD		 1796 shost_printk(KERN_WARNING, target->scsi_host,
1797 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1798 break;
1799 }
1800
1801 if (comp)
1802 complete(&target->done);
1803
aef9ec39
RD		 1804 return 0;
1805}
1806
d945e1df 1807static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 1808 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 1809{
a95cadb9 1810 struct srp_rport *rport = target->rport;
19081f31 1811 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 1812 struct srp_iu *iu;
1813 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 1814
3780d1f0
BVA		 1815 if (!target->connected || target->qp_in_error)
1816 return -1;
1817
f8b6e31e 1818 init_completion(&target->tsk_mgmt_done);
aef9ec39 1819
a95cadb9
BVA		 1820 /*
1821 * Lock the rport mutex to avoid that srp_create_target_ib() is
1822 * invoked while a task management function is being sent.
1823 */
1824 mutex_lock(&rport->mutex);
e9684678 1825 spin_lock_irq(&target->lock);
bb12588a 1826 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 1827 spin_unlock_irq(&target->lock);
76c75b25 1828
a95cadb9
BVA		 1829 if (!iu) {
1830 mutex_unlock(&rport->mutex);
1831
76c75b25 1832 return -1;
a95cadb9 1833 }
aef9ec39 1834
19081f31
DD		 1835 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1836 DMA_TO_DEVICE);
aef9ec39
RD		 1837 tsk_mgmt = iu->buf;
1838 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1839
1840 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 1841 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1842 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 1843 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 1844 tsk_mgmt->task_tag = req_tag;
aef9ec39 1845
19081f31
DD		 1846 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1847 DMA_TO_DEVICE);
76c75b25
BVA		 1848 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
1849 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 1850 mutex_unlock(&rport->mutex);
1851
76c75b25
BVA		 1852 return -1;
1853 }
a95cadb9 1854 mutex_unlock(&rport->mutex);
d945e1df 1855
f8b6e31e 1856 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 1857 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1858 return -1;
aef9ec39 1859
d945e1df 1860 return 0;
d945e1df
RD		 1861}
1862
aef9ec39
RD		 1863static int srp_abort(struct scsi_cmnd *scmnd)
1864{
d945e1df 1865 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 1866 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
086f44f5 1867 int ret;
d945e1df 1868
7aa54bd7 1869 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 1870
c7c4e7ff 1871 if (!req || !srp_claim_req(target, req, scmnd))
d945e1df 1872 return FAILED;
086f44f5 1873 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
80d5e8a2 1874 SRP_TSK_ABORT_TASK) == 0)
086f44f5 1875 ret = SUCCESS;
ed9b2264 1876 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 1877 ret = FAST_IO_FAIL;
086f44f5
BVA		 1878 else
1879 ret = FAILED;
22032991
BVA		 1880 srp_free_req(target, req, scmnd, 0);
1881 scmnd->result = DID_ABORT << 16;
d8536670 1882 scmnd->scsi_done(scmnd);
d945e1df 1883
086f44f5 1884 return ret;
aef9ec39
RD		 1885}
1886
1887static int srp_reset_device(struct scsi_cmnd *scmnd)
1888{
d945e1df 1889 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 1890 int i;
d945e1df 1891
7aa54bd7 1892 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 1893
f8b6e31e
DD		 1894 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
1895 SRP_TSK_LUN_RESET))
d945e1df 1896 return FAILED;
f8b6e31e 1897 if (target->tsk_mgmt_status)
d945e1df
RD		 1898 return FAILED;
1899
536ae14e
BVA		 1900 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1901 struct srp_request *req = &target->req_ring[i];
f8b6e31e 1902 if (req->scmnd && req->scmnd->device == scmnd->device)
ed9b2264 1903 srp_finish_req(target, req, DID_RESET << 16);
536ae14e 1904 }
d945e1df 1905
d945e1df 1906 return SUCCESS;
aef9ec39
RD		 1907}
1908
1909static int srp_reset_host(struct scsi_cmnd *scmnd)
1910{
1911 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 1912
7aa54bd7 1913 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 1914
ed9b2264 1915 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 1916}
1917
c9b03c1a
BVA		 1918static int srp_slave_configure(struct scsi_device *sdev)
1919{
1920 struct Scsi_Host *shost = sdev->host;
1921 struct srp_target_port *target = host_to_target(shost);
1922 struct request_queue *q = sdev->request_queue;
1923 unsigned long timeout;
1924
1925 if (sdev->type == TYPE_DISK) {
1926 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
1927 blk_queue_rq_timeout(q, timeout);
1928 }
1929
1930 return 0;
1931}
1932
ee959b00
TJ		 1933static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1934 char *buf)
6ecb0c84 1935{
ee959b00 1936 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1937
6ecb0c84
RD		 1938 return sprintf(buf, "0x%016llx\n",
1939 (unsigned long long) be64_to_cpu(target->id_ext));
1940}
1941
ee959b00
TJ		 1942static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1943 char *buf)
6ecb0c84 1944{
ee959b00 1945 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1946
6ecb0c84
RD		 1947 return sprintf(buf, "0x%016llx\n",
1948 (unsigned long long) be64_to_cpu(target->ioc_guid));
1949}
1950
ee959b00
TJ		 1951static ssize_t show_service_id(struct device *dev,
1952 struct device_attribute *attr, char *buf)
6ecb0c84 1953{
ee959b00 1954 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1955
6ecb0c84
RD		 1956 return sprintf(buf, "0x%016llx\n",
1957 (unsigned long long) be64_to_cpu(target->service_id));
1958}
1959
ee959b00
TJ		 1960static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1961 char *buf)
6ecb0c84 1962{
ee959b00 1963 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1964
6ecb0c84
RD		 1965 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1966}
1967
ee959b00
TJ		 1968static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1969 char *buf)
6ecb0c84 1970{
ee959b00 1971 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1972
5b095d98 1973 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 1974}
1975
ee959b00
TJ		 1976static ssize_t show_orig_dgid(struct device *dev,
1977 struct device_attribute *attr, char *buf)
3633b3d0 1978{
ee959b00 1979 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 1980
5b095d98 1981 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 1982}
1983
89de7486
BVA		 1984static ssize_t show_req_lim(struct device *dev,
1985 struct device_attribute *attr, char *buf)
1986{
1987 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1988
89de7486
BVA		 1989 return sprintf(buf, "%d\n", target->req_lim);
1990}
1991
ee959b00
TJ		 1992static ssize_t show_zero_req_lim(struct device *dev,
1993 struct device_attribute *attr, char *buf)
6bfa24fa 1994{
ee959b00 1995 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 1996
6bfa24fa
RD		 1997 return sprintf(buf, "%d\n", target->zero_req_lim);
1998}
1999
ee959b00
TJ		 2000static ssize_t show_local_ib_port(struct device *dev,
2001 struct device_attribute *attr, char *buf)
ded7f1a1 2002{
ee959b00 2003 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2004
2005 return sprintf(buf, "%d\n", target->srp_host->port);
2006}
2007
ee959b00
TJ		 2008static ssize_t show_local_ib_device(struct device *dev,
2009 struct device_attribute *attr, char *buf)
ded7f1a1 2010{
ee959b00 2011 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2012
05321937 2013 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2014}
2015
4b5e5f41
BVA		 2016static ssize_t show_comp_vector(struct device *dev,
2017 struct device_attribute *attr, char *buf)
2018{
2019 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2020
2021 return sprintf(buf, "%d\n", target->comp_vector);
2022}
2023
7bb312e4
VP		 2024static ssize_t show_tl_retry_count(struct device *dev,
2025 struct device_attribute *attr, char *buf)
2026{
2027 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2028
2029 return sprintf(buf, "%d\n", target->tl_retry_count);
2030}
2031
49248644
DD		 2032static ssize_t show_cmd_sg_entries(struct device *dev,
2033 struct device_attribute *attr, char *buf)
2034{
2035 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2036
2037 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2038}
2039
c07d424d
DD		 2040static ssize_t show_allow_ext_sg(struct device *dev,
2041 struct device_attribute *attr, char *buf)
2042{
2043 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2044
2045 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2046}
2047
ee959b00
TJ		 2048static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2049static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2050static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2051static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2052static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2053static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2054static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2055static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2056static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2057static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2058static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2059static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2060static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2061static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2062
2063static struct device_attribute *srp_host_attrs[] = {
2064 &dev_attr_id_ext,
2065 &dev_attr_ioc_guid,
2066 &dev_attr_service_id,
2067 &dev_attr_pkey,
2068 &dev_attr_dgid,
2069 &dev_attr_orig_dgid,
89de7486 2070 &dev_attr_req_lim,
ee959b00
TJ		 2071 &dev_attr_zero_req_lim,
2072 &dev_attr_local_ib_port,
2073 &dev_attr_local_ib_device,
4b5e5f41 2074 &dev_attr_comp_vector,
7bb312e4 2075 &dev_attr_tl_retry_count,
49248644 2076 &dev_attr_cmd_sg_entries,
c07d424d 2077 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2078 NULL
2079};
2080
aef9ec39
RD		 2081static struct scsi_host_template srp_template = {
2082 .module = THIS_MODULE,
b7f008fd
RD		 2083 .name = "InfiniBand SRP initiator",
2084 .proc_name = DRV_NAME,
c9b03c1a 2085 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2086 .info = srp_target_info,
2087 .queuecommand = srp_queuecommand,
2088 .eh_abort_handler = srp_abort,
2089 .eh_device_reset_handler = srp_reset_device,
2090 .eh_host_reset_handler = srp_reset_host,
2742c1da 2091 .skip_settle_delay = true,
49248644 2092 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
dd5e6e38 2093 .can_queue = SRP_CMD_SQ_SIZE,
aef9ec39 2094 .this_id = -1,
dd5e6e38 2095 .cmd_per_lun = SRP_CMD_SQ_SIZE,
6ecb0c84
RD		 2096 .use_clustering = ENABLE_CLUSTERING,
2097 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2098};
2099
2100static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2101{
3236822b
FT		 2102 struct srp_rport_identifiers ids;
2103 struct srp_rport *rport;
2104
aef9ec39
RD		 2105 sprintf(target->target_name, "SRP.T10:%016llX",
2106 (unsigned long long) be64_to_cpu(target->id_ext));
2107
05321937 2108 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2109 return -ENODEV;
2110
3236822b
FT		 2111 memcpy(ids.port_id, &target->id_ext, 8);
2112 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2113 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2114 rport = srp_rport_add(target->scsi_host, &ids);
2115 if (IS_ERR(rport)) {
2116 scsi_remove_host(target->scsi_host);
2117 return PTR_ERR(rport);
2118 }
2119
dc1bdbd9 2120 rport->lld_data = target;
9dd69a60 2121 target->rport = rport;
dc1bdbd9 2122
b3589fd4 2123 spin_lock(&host->target_lock);
aef9ec39 2124 list_add_tail(&target->list, &host->target_list);
b3589fd4 2125 spin_unlock(&host->target_lock);
aef9ec39
RD		 2126
2127 target->state = SRP_TARGET_LIVE;
2128
aef9ec39 2129 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2130 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 2131
2132 return 0;
2133}
2134
ee959b00 2135static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2136{
2137 struct srp_host *host =
ee959b00 2138 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2139
2140 complete(&host->released);
2141}
2142
2143static struct class srp_class = {
2144 .name = "infiniband_srp",
ee959b00 2145 .dev_release = srp_release_dev
aef9ec39
RD		 2146};
2147
96fc248a
BVA		 2148/**
2149 * srp_conn_unique() - check whether the connection to a target is unique
2150 */
2151static bool srp_conn_unique(struct srp_host *host,
2152 struct srp_target_port *target)
2153{
2154 struct srp_target_port *t;
2155 bool ret = false;
2156
2157 if (target->state == SRP_TARGET_REMOVED)
2158 goto out;
2159
2160 ret = true;
2161
2162 spin_lock(&host->target_lock);
2163 list_for_each_entry(t, &host->target_list, list) {
2164 if (t != target &&
2165 target->id_ext == t->id_ext &&
2166 target->ioc_guid == t->ioc_guid &&
2167 target->initiator_ext == t->initiator_ext) {
2168 ret = false;
2169 break;
2170 }
2171 }
2172 spin_unlock(&host->target_lock);
2173
2174out:
2175 return ret;
2176}
2177
aef9ec39
RD		 2178/*
2179 * Target ports are added by writing
2180 *
2181 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2182 * pkey=<P_Key>,service_id=<service ID>
2183 *
2184 * to the add_target sysfs attribute.
2185 */
2186enum {
2187 SRP_OPT_ERR = 0,
2188 SRP_OPT_ID_EXT = 1 << 0,
2189 SRP_OPT_IOC_GUID = 1 << 1,
2190 SRP_OPT_DGID = 1 << 2,
2191 SRP_OPT_PKEY = 1 << 3,
2192 SRP_OPT_SERVICE_ID = 1 << 4,
2193 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2194 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2195 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2196 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2197 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2198 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2199 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2200 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2201 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
aef9ec39
RD		 2202 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2203 SRP_OPT_IOC_GUID |
2204 SRP_OPT_DGID |
2205 SRP_OPT_PKEY |
2206 SRP_OPT_SERVICE_ID),
2207};
2208
a447c093 2209static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2210 { SRP_OPT_ID_EXT, "id_ext=%s" },
2211 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2212 { SRP_OPT_DGID, "dgid=%s" },
2213 { SRP_OPT_PKEY, "pkey=%x" },
2214 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2215 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2216 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2217 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2218 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2219 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2220 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2221 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2222 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2223 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
52fb2b50 2224 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2225};
2226
2227static int srp_parse_options(const char *buf, struct srp_target_port *target)
2228{
2229 char *options, *sep_opt;
2230 char *p;
2231 char dgid[3];
2232 substring_t args[MAX_OPT_ARGS];
2233 int opt_mask = 0;
2234 int token;
2235 int ret = -EINVAL;
2236 int i;
2237
2238 options = kstrdup(buf, GFP_KERNEL);
2239 if (!options)
2240 return -ENOMEM;
2241
2242 sep_opt = options;
2243 while ((p = strsep(&sep_opt, ",")) != NULL) {
2244 if (!*p)
2245 continue;
2246
2247 token = match_token(p, srp_opt_tokens, args);
2248 opt_mask |= token;
2249
2250 switch (token) {
2251 case SRP_OPT_ID_EXT:
2252 p = match_strdup(args);
a20f3a6d
IR		 2253 if (!p) {
2254 ret = -ENOMEM;
2255 goto out;
2256 }
aef9ec39
RD		 2257 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2258 kfree(p);
2259 break;
2260
2261 case SRP_OPT_IOC_GUID:
2262 p = match_strdup(args);
a20f3a6d
IR		 2263 if (!p) {
2264 ret = -ENOMEM;
2265 goto out;
2266 }
aef9ec39
RD		 2267 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2268 kfree(p);
2269 break;
2270
2271 case SRP_OPT_DGID:
2272 p = match_strdup(args);
a20f3a6d
IR		 2273 if (!p) {
2274 ret = -ENOMEM;
2275 goto out;
2276 }
aef9ec39 2277 if (strlen(p) != 32) {
e0bda7d8 2278 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2279 kfree(p);
aef9ec39
RD		 2280 goto out;
2281 }
2282
2283 for (i = 0; i < 16; ++i) {
2284 strlcpy(dgid, p + i * 2, 3);
2285 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2286 }
bf17c1c7 2287 kfree(p);
3633b3d0 2288 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2289 break;
2290
2291 case SRP_OPT_PKEY:
2292 if (match_hex(args, &token)) {
e0bda7d8 2293 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2294 goto out;
2295 }
2296 target->path.pkey = cpu_to_be16(token);
2297 break;
2298
2299 case SRP_OPT_SERVICE_ID:
2300 p = match_strdup(args);
a20f3a6d
IR		 2301 if (!p) {
2302 ret = -ENOMEM;
2303 goto out;
2304 }
aef9ec39 2305 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2306 target->path.service_id = target->service_id;
aef9ec39
RD		 2307 kfree(p);
2308 break;
2309
2310 case SRP_OPT_MAX_SECT:
2311 if (match_int(args, &token)) {
e0bda7d8 2312 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2313 goto out;
2314 }
2315 target->scsi_host->max_sectors = token;
2316 break;
2317
52fb2b50
VP		 2318 case SRP_OPT_MAX_CMD_PER_LUN:
2319 if (match_int(args, &token)) {
e0bda7d8
BVA		 2320 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2321 p);
52fb2b50
VP		 2322 goto out;
2323 }
dd5e6e38 2324 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
52fb2b50
VP		 2325 break;
2326
0c0450db
R		 2327 case SRP_OPT_IO_CLASS:
2328 if (match_hex(args, &token)) {
e0bda7d8 2329 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2330 goto out;
2331 }
2332 if (token != SRP_REV10_IB_IO_CLASS &&
2333 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2334 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2335 token, SRP_REV10_IB_IO_CLASS,
2336 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2337 goto out;
2338 }
2339 target->io_class = token;
2340 break;
2341
01cb9bcb
IR		 2342 case SRP_OPT_INITIATOR_EXT:
2343 p = match_strdup(args);
a20f3a6d
IR		 2344 if (!p) {
2345 ret = -ENOMEM;
2346 goto out;
2347 }
01cb9bcb
IR		 2348 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2349 kfree(p);
2350 break;
2351
49248644
DD		 2352 case SRP_OPT_CMD_SG_ENTRIES:
2353 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2354 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2355 p);
49248644
DD		 2356 goto out;
2357 }
2358 target->cmd_sg_cnt = token;
2359 break;
2360
c07d424d
DD		 2361 case SRP_OPT_ALLOW_EXT_SG:
2362 if (match_int(args, &token)) {
e0bda7d8 2363 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2364 goto out;
2365 }
2366 target->allow_ext_sg = !!token;
2367 break;
2368
2369 case SRP_OPT_SG_TABLESIZE:
2370 if (match_int(args, &token) || token < 1 ||
2371 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2372 pr_warn("bad max sg_tablesize parameter '%s'\n",
2373 p);
c07d424d
DD		 2374 goto out;
2375 }
2376 target->sg_tablesize = token;
2377 break;
2378
4b5e5f41
BVA		 2379 case SRP_OPT_COMP_VECTOR:
2380 if (match_int(args, &token) || token < 0) {
2381 pr_warn("bad comp_vector parameter '%s'\n", p);
2382 goto out;
2383 }
2384 target->comp_vector = token;
2385 break;
2386
7bb312e4
VP		 2387 case SRP_OPT_TL_RETRY_COUNT:
2388 if (match_int(args, &token) || token < 2 || token > 7) {
2389 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2390 p);
2391 goto out;
2392 }
2393 target->tl_retry_count = token;
2394 break;
2395
aef9ec39 2396 default:
e0bda7d8
BVA		 2397 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2398 p);
aef9ec39
RD		 2399 goto out;
2400 }
2401 }
2402
2403 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2404 ret = 0;
2405 else
2406 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2407 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2408 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2409 pr_warn("target creation request is missing parameter '%s'\n",
2410 srp_opt_tokens[i].pattern);
aef9ec39
RD		 2411
2412out:
2413 kfree(options);
2414 return ret;
2415}
2416
ee959b00
TJ		 2417static ssize_t srp_create_target(struct device *dev,
2418 struct device_attribute *attr,
aef9ec39
RD		 2419 const char *buf, size_t count)
2420{
2421 struct srp_host *host =
ee959b00 2422 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2423 struct Scsi_Host *target_host;
2424 struct srp_target_port *target;
c07d424d
DD		 2425 struct ib_device *ibdev = host->srp_dev->dev;
2426 dma_addr_t dma_addr;
8f26c9ff 2427 int i, ret;
aef9ec39
RD		 2428
2429 target_host = scsi_host_alloc(&srp_template,
2430 sizeof (struct srp_target_port));
2431 if (!target_host)
2432 return -ENOMEM;
2433
49248644 2434 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2435 target_host->max_channel = 0;
2436 target_host->max_id = 1;
3c8edf0e
AR		 2437 target_host->max_lun = SRP_MAX_LUN;
2438 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2439
aef9ec39 2440 target = host_to_target(target_host);
aef9ec39 2441
49248644
DD		 2442 target->io_class = SRP_REV16A_IB_IO_CLASS;
2443 target->scsi_host = target_host;
2444 target->srp_host = host;
2445 target->lkey = host->srp_dev->mr->lkey;
2446 target->rkey = host->srp_dev->mr->rkey;
2447 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2448 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2449 target->allow_ext_sg = allow_ext_sg;
7bb312e4 2450 target->tl_retry_count = 7;
aef9ec39 2451
aef9ec39
RD		 2452 ret = srp_parse_options(buf, target);
2453 if (ret)
2454 goto err;
2455
96fc248a
BVA		 2456 if (!srp_conn_unique(target->srp_host, target)) {
2457 shost_printk(KERN_INFO, target->scsi_host,
2458 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2459 be64_to_cpu(target->id_ext),
2460 be64_to_cpu(target->ioc_guid),
2461 be64_to_cpu(target->initiator_ext));
2462 ret = -EEXIST;
2463 goto err;
2464 }
2465
c07d424d
DD		 2466 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2467 target->cmd_sg_cnt < target->sg_tablesize) {
e0bda7d8 2468 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 2469 target->sg_tablesize = target->cmd_sg_cnt;
2470 }
2471
2472 target_host->sg_tablesize = target->sg_tablesize;
2473 target->indirect_size = target->sg_tablesize *
2474 sizeof (struct srp_direct_buf);
49248644
DD		 2475 target->max_iu_len = sizeof (struct srp_cmd) +
2476 sizeof (struct srp_indirect_buf) +
2477 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2478
c1120f89 2479 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 2480 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 2481 spin_lock_init(&target->lock);
2482 INIT_LIST_HEAD(&target->free_tx);
2483 INIT_LIST_HEAD(&target->free_reqs);
2484 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
2485 struct srp_request *req = &target->req_ring[i];
2486
2487 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *),
2488 GFP_KERNEL);
2489 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *),
2490 GFP_KERNEL);
c07d424d
DD		 2491 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
2492 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
8f26c9ff
DD		 2493 goto err_free_mem;
2494
c07d424d
DD		 2495 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
2496 target->indirect_size,
2497 DMA_TO_DEVICE);
2498 if (ib_dma_mapping_error(ibdev, dma_addr))
2499 goto err_free_mem;
2500
2501 req->indirect_dma_addr = dma_addr;
8f26c9ff
DD		 2502 req->index = i;
2503 list_add_tail(&req->list, &target->free_reqs);
2504 }
2505
c07d424d 2506 ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
aef9ec39 2507
7aa54bd7
DD		 2508 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2509 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
5b095d98 2510 "service_id %016llx dgid %pI6\n",
aef9ec39
RD		 2511 (unsigned long long) be64_to_cpu(target->id_ext),
2512 (unsigned long long) be64_to_cpu(target->ioc_guid),
2513 be16_to_cpu(target->path.pkey),
2514 (unsigned long long) be64_to_cpu(target->service_id),
8867cd7c 2515 target->path.dgid.raw);
aef9ec39
RD		 2516
2517 ret = srp_create_target_ib(target);
2518 if (ret)
8f26c9ff 2519 goto err_free_mem;
aef9ec39 2520
9fe4bcf4
DD		 2521 ret = srp_new_cm_id(target);
2522 if (ret)
8f26c9ff 2523 goto err_free_ib;
aef9ec39
RD		 2524
2525 ret = srp_connect_target(target);
2526 if (ret) {
7aa54bd7
DD		 2527 shost_printk(KERN_ERR, target->scsi_host,
2528 PFX "Connection failed\n");
aef9ec39
RD		 2529 goto err_cm_id;
2530 }
2531
2532 ret = srp_add_target(host, target);
2533 if (ret)
2534 goto err_disconnect;
2535
2536 return count;
2537
2538err_disconnect:
2539 srp_disconnect_target(target);
2540
2541err_cm_id:
2542 ib_destroy_cm_id(target->cm_id);
2543
8f26c9ff 2544err_free_ib:
aef9ec39
RD		 2545 srp_free_target_ib(target);
2546
8f26c9ff
DD		 2547err_free_mem:
2548 srp_free_req_data(target);
2549
aef9ec39
RD		 2550err:
2551 scsi_host_put(target_host);
2552
2553 return ret;
2554}
2555
ee959b00 2556static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2557
ee959b00
TJ		 2558static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2559 char *buf)
aef9ec39 2560{
ee959b00 2561 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2562
05321937 2563 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2564}
2565
ee959b00 2566static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2567
ee959b00
TJ		 2568static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2569 char *buf)
aef9ec39 2570{
ee959b00 2571 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2572
2573 return sprintf(buf, "%d\n", host->port);
2574}
2575
ee959b00 2576static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2577
f5358a17 2578static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2579{
2580 struct srp_host *host;
2581
2582 host = kzalloc(sizeof *host, GFP_KERNEL);
2583 if (!host)
2584 return NULL;
2585
2586 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2587 spin_lock_init(&host->target_lock);
aef9ec39 2588 init_completion(&host->released);
05321937 2589 host->srp_dev = device;
aef9ec39
RD		 2590 host->port = port;
2591
ee959b00
TJ		 2592 host->dev.class = &srp_class;
2593 host->dev.parent = device->dev->dma_device;
d927e38c 2594 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2595
ee959b00 2596 if (device_register(&host->dev))
f5358a17 2597 goto free_host;
ee959b00 2598 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2599 goto err_class;
ee959b00 2600 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2601 goto err_class;
ee959b00 2602 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2603 goto err_class;
2604
2605 return host;
2606
2607err_class:
ee959b00 2608 device_unregister(&host->dev);
aef9ec39 2609
f5358a17 2610free_host:
aef9ec39
RD		 2611 kfree(host);
2612
2613 return NULL;
2614}
2615
2616static void srp_add_one(struct ib_device *device)
2617{
f5358a17
RD		 2618 struct srp_device *srp_dev;
2619 struct ib_device_attr *dev_attr;
2620 struct ib_fmr_pool_param fmr_param;
aef9ec39 2621 struct srp_host *host;
be8b9814 2622 int max_pages_per_fmr, fmr_page_shift, s, e, p;
aef9ec39 2623
f5358a17
RD		 2624 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2625 if (!dev_attr)
cf311cd4 2626 return;
aef9ec39 2627
f5358a17 2628 if (ib_query_device(device, dev_attr)) {
e0bda7d8 2629 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 2630 goto free_attr;
2631 }
2632
2633 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2634 if (!srp_dev)
2635 goto free_attr;
2636
2637 /*
2638 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 2639 * minimum of 4096 bytes. We're unlikely to build large sglists
2640 * out of smaller entries.
f5358a17 2641 */
8f26c9ff
DD		 2642 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2643 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2644 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2645 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
f5358a17
RD		 2646
2647 INIT_LIST_HEAD(&srp_dev->dev_list);
2648
2649 srp_dev->dev = device;
2650 srp_dev->pd = ib_alloc_pd(device);
2651 if (IS_ERR(srp_dev->pd))
2652 goto free_dev;
2653
2654 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2655 IB_ACCESS_LOCAL_WRITE |
2656 IB_ACCESS_REMOTE_READ |
2657 IB_ACCESS_REMOTE_WRITE);
2658 if (IS_ERR(srp_dev->mr))
2659 goto err_pd;
2660
be8b9814
DD		 2661 for (max_pages_per_fmr = SRP_FMR_SIZE;
2662 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2663 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2664 memset(&fmr_param, 0, sizeof fmr_param);
2665 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2666 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2667 fmr_param.cache = 1;
2668 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2669 fmr_param.page_shift = fmr_page_shift;
2670 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2671 IB_ACCESS_REMOTE_WRITE |
2672 IB_ACCESS_REMOTE_READ);
2673
2674 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2675 if (!IS_ERR(srp_dev->fmr_pool))
2676 break;
2677 }
2678
f5358a17
RD		 2679 if (IS_ERR(srp_dev->fmr_pool))
2680 srp_dev->fmr_pool = NULL;
aef9ec39 2681
07ebafba 2682 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2683 s = 0;
2684 e = 0;
2685 } else {
2686 s = 1;
2687 e = device->phys_port_cnt;
2688 }
2689
2690 for (p = s; p <= e; ++p) {
f5358a17 2691 host = srp_add_port(srp_dev, p);
aef9ec39 2692 if (host)
f5358a17 2693 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2694 }
2695
f5358a17
RD		 2696 ib_set_client_data(device, &srp_client, srp_dev);
2697
2698 goto free_attr;
2699
2700err_pd:
2701 ib_dealloc_pd(srp_dev->pd);
2702
2703free_dev:
2704 kfree(srp_dev);
2705
2706free_attr:
2707 kfree(dev_attr);
aef9ec39
RD		 2708}
2709
2710static void srp_remove_one(struct ib_device *device)
2711{
f5358a17 2712 struct srp_device *srp_dev;
aef9ec39 2713 struct srp_host *host, *tmp_host;
ef6c49d8 2714 struct srp_target_port *target;
aef9ec39 2715
f5358a17 2716 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 2717 if (!srp_dev)
2718 return;
aef9ec39 2719
f5358a17 2720 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2721 device_unregister(&host->dev);
aef9ec39
RD		 2722 /*
2723 * Wait for the sysfs entry to go away, so that no new
2724 * target ports can be created.
2725 */
2726 wait_for_completion(&host->released);
2727
2728 /*
ef6c49d8 2729 * Remove all target ports.
aef9ec39 2730 */
b3589fd4 2731 spin_lock(&host->target_lock);
ef6c49d8
BVA		 2732 list_for_each_entry(target, &host->target_list, list)
2733 srp_queue_remove_work(target);
b3589fd4 2734 spin_unlock(&host->target_lock);
aef9ec39
RD		 2735
2736 /*
ef6c49d8 2737 * Wait for target port removal tasks.
aef9ec39 2738 */
ef6c49d8 2739 flush_workqueue(system_long_wq);
aef9ec39 2740
aef9ec39
RD		 2741 kfree(host);
2742 }
2743
f5358a17
RD		 2744 if (srp_dev->fmr_pool)
2745 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2746 ib_dereg_mr(srp_dev->mr);
2747 ib_dealloc_pd(srp_dev->pd);
2748
2749 kfree(srp_dev);
aef9ec39
RD		 2750}
2751
3236822b 2752static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 2753 .has_rport_state = true,
2754 .reset_timer_if_blocked = true,
a95cadb9 2755 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 2756 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
2757 .dev_loss_tmo = &srp_dev_loss_tmo,
2758 .reconnect = srp_rport_reconnect,
dc1bdbd9 2759 .rport_delete = srp_rport_delete,
ed9b2264 2760 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 2761};
2762
aef9ec39
RD		 2763static int __init srp_init_module(void)
2764{
2765 int ret;
2766
dcb4cb85 2767 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 2768
49248644 2769 if (srp_sg_tablesize) {
e0bda7d8 2770 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 2771 if (!cmd_sg_entries)
2772 cmd_sg_entries = srp_sg_tablesize;
2773 }
2774
2775 if (!cmd_sg_entries)
2776 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2777
2778 if (cmd_sg_entries > 255) {
e0bda7d8 2779 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 2780 cmd_sg_entries = 255;
1e89a194
DD		 2781 }
2782
c07d424d
DD		 2783 if (!indirect_sg_entries)
2784 indirect_sg_entries = cmd_sg_entries;
2785 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 2786 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2787 cmd_sg_entries);
c07d424d
DD		 2788 indirect_sg_entries = cmd_sg_entries;
2789 }
2790
3236822b
FT		 2791 ib_srp_transport_template =
2792 srp_attach_transport(&ib_srp_transport_functions);
2793 if (!ib_srp_transport_template)
2794 return -ENOMEM;
2795
aef9ec39
RD		 2796 ret = class_register(&srp_class);
2797 if (ret) {
e0bda7d8 2798 pr_err("couldn't register class infiniband_srp\n");
3236822b 2799 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2800 return ret;
2801 }
2802
c1a0b23b
MT		 2803 ib_sa_register_client(&srp_sa_client);
2804
aef9ec39
RD		 2805 ret = ib_register_client(&srp_client);
2806 if (ret) {
e0bda7d8 2807 pr_err("couldn't register IB client\n");
3236822b 2808 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2809 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2810 class_unregister(&srp_class);
2811 return ret;
2812 }
2813
2814 return 0;
2815}
2816
2817static void __exit srp_cleanup_module(void)
2818{
2819 ib_unregister_client(&srp_client);
c1a0b23b 2820 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 2821 class_unregister(&srp_class);
3236822b 2822 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2823}
2824
2825module_init(srp_init_module);
2826module_exit(srp_cleanup_module);
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