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IB/srp: Introduce srp_finish_mapping()
[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>
71444b97 49#include <scsi/scsi_tcq.h>
aef9ec39 50#include <scsi/srp.h>
3236822b 51#include <scsi/scsi_transport_srp.h>
aef9ec39 52
aef9ec39
RD		 53#include "ib_srp.h"
54
55#define DRV_NAME "ib_srp"
56#define PFX DRV_NAME ": "
e8ca4135
VP		 57#define DRV_VERSION "1.0"
58#define DRV_RELDATE "July 1, 2013"
aef9ec39
RD		 59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
49248644
DD		 65static unsigned int srp_sg_tablesize;
66static unsigned int cmd_sg_entries;
c07d424d
DD		 67static unsigned int indirect_sg_entries;
68static bool allow_ext_sg;
49248644 69static int topspin_workarounds = 1;
74b0a15b 70
49248644
DD		 71module_param(srp_sg_tablesize, uint, 0444);
72MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
74b0a15b 73
49248644
DD		 74module_param(cmd_sg_entries, uint, 0444);
75MODULE_PARM_DESC(cmd_sg_entries,
76 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
aef9ec39 77
c07d424d
DD		 78module_param(indirect_sg_entries, uint, 0444);
79MODULE_PARM_DESC(indirect_sg_entries,
80 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
81
82module_param(allow_ext_sg, bool, 0444);
83MODULE_PARM_DESC(allow_ext_sg,
84 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
85
aef9ec39
RD		 86module_param(topspin_workarounds, int, 0444);
87MODULE_PARM_DESC(topspin_workarounds,
88 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
89
ed9b2264
BVA		 90static struct kernel_param_ops srp_tmo_ops;
91
a95cadb9
BVA		 92static int srp_reconnect_delay = 10;
93module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
94 S_IRUGO | S_IWUSR);
95MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
96
ed9b2264
BVA		 97static int srp_fast_io_fail_tmo = 15;
98module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
99 S_IRUGO | S_IWUSR);
100MODULE_PARM_DESC(fast_io_fail_tmo,
101 "Number of seconds between the observation of a transport"
102 " layer error and failing all I/O. \"off\" means that this"
103 " functionality is disabled.");
104
a95cadb9 105static int srp_dev_loss_tmo = 600;
ed9b2264
BVA		 106module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
107 S_IRUGO | S_IWUSR);
108MODULE_PARM_DESC(dev_loss_tmo,
109 "Maximum number of seconds that the SRP transport should"
110 " insulate transport layer errors. After this time has been"
111 " exceeded the SCSI host is removed. Should be"
112 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
113 " if fast_io_fail_tmo has not been set. \"off\" means that"
114 " this functionality is disabled.");
115
aef9ec39
RD		 116static void srp_add_one(struct ib_device *device);
117static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 118static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
119static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 120static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
121
3236822b
FT		 122static struct scsi_transport_template *ib_srp_transport_template;
123
aef9ec39
RD		 124static struct ib_client srp_client = {
125 .name = "srp",
126 .add = srp_add_one,
127 .remove = srp_remove_one
128};
129
c1a0b23b
MT		 130static struct ib_sa_client srp_sa_client;
131
ed9b2264
BVA		 132static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
133{
134 int tmo = *(int *)kp->arg;
135
136 if (tmo >= 0)
137 return sprintf(buffer, "%d", tmo);
138 else
139 return sprintf(buffer, "off");
140}
141
142static int srp_tmo_set(const char *val, const struct kernel_param *kp)
143{
144 int tmo, res;
145
146 if (strncmp(val, "off", 3) != 0) {
147 res = kstrtoint(val, 0, &tmo);
148 if (res)
149 goto out;
150 } else {
151 tmo = -1;
152 }
a95cadb9
BVA		 153 if (kp->arg == &srp_reconnect_delay)
154 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
155 srp_dev_loss_tmo);
156 else if (kp->arg == &srp_fast_io_fail_tmo)
157 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
ed9b2264 158 else
a95cadb9
BVA		 159 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
160 tmo);
ed9b2264
BVA		 161 if (res)
162 goto out;
163 *(int *)kp->arg = tmo;
164
165out:
166 return res;
167}
168
169static struct kernel_param_ops srp_tmo_ops = {
170 .get = srp_tmo_get,
171 .set = srp_tmo_set,
172};
173
aef9ec39
RD		 174static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
175{
176 return (struct srp_target_port *) host->hostdata;
177}
178
179static const char *srp_target_info(struct Scsi_Host *host)
180{
181 return host_to_target(host)->target_name;
182}
183
5d7cbfd6
RD		 184static int srp_target_is_topspin(struct srp_target_port *target)
185{
186 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 187 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 188
189 return topspin_workarounds &&
3d1ff48d
RK		 190 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
191 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 192}
193
aef9ec39
RD		 194static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
195 gfp_t gfp_mask,
196 enum dma_data_direction direction)
197{
198 struct srp_iu *iu;
199
200 iu = kmalloc(sizeof *iu, gfp_mask);
201 if (!iu)
202 goto out;
203
204 iu->buf = kzalloc(size, gfp_mask);
205 if (!iu->buf)
206 goto out_free_iu;
207
05321937
GKH		 208 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
209 direction);
210 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 211 goto out_free_buf;
212
213 iu->size = size;
214 iu->direction = direction;
215
216 return iu;
217
218out_free_buf:
219 kfree(iu->buf);
220out_free_iu:
221 kfree(iu);
222out:
223 return NULL;
224}
225
226static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
227{
228 if (!iu)
229 return;
230
05321937
GKH		 231 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
232 iu->direction);
aef9ec39
RD		 233 kfree(iu->buf);
234 kfree(iu);
235}
236
237static void srp_qp_event(struct ib_event *event, void *context)
238{
e0bda7d8 239 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 240}
241
242static int srp_init_qp(struct srp_target_port *target,
243 struct ib_qp *qp)
244{
245 struct ib_qp_attr *attr;
246 int ret;
247
248 attr = kmalloc(sizeof *attr, GFP_KERNEL);
249 if (!attr)
250 return -ENOMEM;
251
969a60f9
RD		 252 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
253 target->srp_host->port,
254 be16_to_cpu(target->path.pkey),
255 &attr->pkey_index);
aef9ec39
RD		 256 if (ret)
257 goto out;
258
259 attr->qp_state = IB_QPS_INIT;
260 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
261 IB_ACCESS_REMOTE_WRITE);
262 attr->port_num = target->srp_host->port;
263
264 ret = ib_modify_qp(qp, attr,
265 IB_QP_STATE |
266 IB_QP_PKEY_INDEX |
267 IB_QP_ACCESS_FLAGS |
268 IB_QP_PORT);
269
270out:
271 kfree(attr);
272 return ret;
273}
274
9fe4bcf4
DD		 275static int srp_new_cm_id(struct srp_target_port *target)
276{
277 struct ib_cm_id *new_cm_id;
278
05321937 279 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 280 srp_cm_handler, target);
281 if (IS_ERR(new_cm_id))
282 return PTR_ERR(new_cm_id);
283
284 if (target->cm_id)
285 ib_destroy_cm_id(target->cm_id);
286 target->cm_id = new_cm_id;
287
288 return 0;
289}
290
aef9ec39
RD		 291static int srp_create_target_ib(struct srp_target_port *target)
292{
62154b2e 293 struct srp_device *dev = target->srp_host->srp_dev;
aef9ec39 294 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 295 struct ib_cq *recv_cq, *send_cq;
296 struct ib_qp *qp;
aef9ec39
RD		 297 int ret;
298
299 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
300 if (!init_attr)
301 return -ENOMEM;
302
62154b2e 303 recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, target,
4d73f95f 304 target->queue_size, target->comp_vector);
73aa89ed
IR		 305 if (IS_ERR(recv_cq)) {
306 ret = PTR_ERR(recv_cq);
da9d2f07 307 goto err;
aef9ec39
RD		 308 }
309
62154b2e 310 send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, target,
4d73f95f 311 target->queue_size, 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;
4d73f95f
BVA		 320 init_attr->cap.max_send_wr = target->queue_size;
321 init_attr->cap.max_recv_wr = target->queue_size;
aef9ec39
RD		 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
62154b2e 329 qp = ib_create_qp(dev->pd, init_attr);
73aa89ed
IR		 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
4d73f95f
BVA		 367/*
368 * Note: this function may be called without srp_alloc_iu_bufs() having been
369 * invoked. Hence the target->[rt]x_ring checks.
370 */
aef9ec39
RD		 371static void srp_free_target_ib(struct srp_target_port *target)
372{
373 int i;
374
375 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 376 ib_destroy_cq(target->send_cq);
377 ib_destroy_cq(target->recv_cq);
aef9ec39 378
73aa89ed
IR		 379 target->qp = NULL;
380 target->send_cq = target->recv_cq = NULL;
381
4d73f95f
BVA		 382 if (target->rx_ring) {
383 for (i = 0; i < target->queue_size; ++i)
384 srp_free_iu(target->srp_host, target->rx_ring[i]);
385 kfree(target->rx_ring);
386 target->rx_ring = NULL;
387 }
388 if (target->tx_ring) {
389 for (i = 0; i < target->queue_size; ++i)
390 srp_free_iu(target->srp_host, target->tx_ring[i]);
391 kfree(target->tx_ring);
392 target->tx_ring = NULL;
393 }
aef9ec39
RD		 394}
395
396static void srp_path_rec_completion(int status,
397 struct ib_sa_path_rec *pathrec,
398 void *target_ptr)
399{
400 struct srp_target_port *target = target_ptr;
401
402 target->status = status;
403 if (status)
7aa54bd7
DD		 404 shost_printk(KERN_ERR, target->scsi_host,
405 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 406 else
407 target->path = *pathrec;
408 complete(&target->done);
409}
410
411static int srp_lookup_path(struct srp_target_port *target)
412{
a702adce
BVA		 413 int ret;
414
aef9ec39
RD		 415 target->path.numb_path = 1;
416
417 init_completion(&target->done);
418
c1a0b23b 419 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 420 target->srp_host->srp_dev->dev,
aef9ec39
RD		 421 target->srp_host->port,
422 &target->path,
247e020e 423 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 424 IB_SA_PATH_REC_DGID |
425 IB_SA_PATH_REC_SGID |
426 IB_SA_PATH_REC_NUMB_PATH |
427 IB_SA_PATH_REC_PKEY,
428 SRP_PATH_REC_TIMEOUT_MS,
429 GFP_KERNEL,
430 srp_path_rec_completion,
431 target, &target->path_query);
432 if (target->path_query_id < 0)
433 return target->path_query_id;
434
a702adce
BVA		 435 ret = wait_for_completion_interruptible(&target->done);
436 if (ret < 0)
437 return ret;
aef9ec39
RD		 438
439 if (target->status < 0)
7aa54bd7
DD		 440 shost_printk(KERN_WARNING, target->scsi_host,
441 PFX "Path record query failed\n");
aef9ec39
RD		 442
443 return target->status;
444}
445
446static int srp_send_req(struct srp_target_port *target)
447{
448 struct {
449 struct ib_cm_req_param param;
450 struct srp_login_req priv;
451 } *req = NULL;
452 int status;
453
454 req = kzalloc(sizeof *req, GFP_KERNEL);
455 if (!req)
456 return -ENOMEM;
457
458 req->param.primary_path = &target->path;
459 req->param.alternate_path = NULL;
460 req->param.service_id = target->service_id;
461 req->param.qp_num = target->qp->qp_num;
462 req->param.qp_type = target->qp->qp_type;
463 req->param.private_data = &req->priv;
464 req->param.private_data_len = sizeof req->priv;
465 req->param.flow_control = 1;
466
467 get_random_bytes(&req->param.starting_psn, 4);
468 req->param.starting_psn &= 0xffffff;
469
470 /*
471 * Pick some arbitrary defaults here; we could make these
472 * module parameters if anyone cared about setting them.
473 */
474 req->param.responder_resources = 4;
475 req->param.remote_cm_response_timeout = 20;
476 req->param.local_cm_response_timeout = 20;
7bb312e4 477 req->param.retry_count = target->tl_retry_count;
aef9ec39
RD		 478 req->param.rnr_retry_count = 7;
479 req->param.max_cm_retries = 15;
480
481 req->priv.opcode = SRP_LOGIN_REQ;
482 req->priv.tag = 0;
49248644 483 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 484 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
485 SRP_BUF_FORMAT_INDIRECT);
0c0450db 486 /*
3cd96564 487 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 488 * port identifier format is 8 bytes of ID extension followed
489 * by 8 bytes of GUID. Older drafts put the two halves in the
490 * opposite order, so that the GUID comes first.
491 *
492 * Targets conforming to these obsolete drafts can be
493 * recognized by the I/O Class they report.
494 */
495 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
496 memcpy(req->priv.initiator_port_id,
01cb9bcb 497 &target->path.sgid.global.interface_id, 8);
0c0450db 498 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 499 &target->initiator_ext, 8);
0c0450db
R		 500 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
501 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
502 } else {
503 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 504 &target->initiator_ext, 8);
505 memcpy(req->priv.initiator_port_id + 8,
506 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 507 memcpy(req->priv.target_port_id, &target->id_ext, 8);
508 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
509 }
510
aef9ec39
RD		 511 /*
512 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 513 * zero out the first 8 bytes of our initiator port ID and set
514 * the second 8 bytes to the local node GUID.
aef9ec39 515 */
5d7cbfd6 516 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 517 shost_printk(KERN_DEBUG, target->scsi_host,
518 PFX "Topspin/Cisco initiator port ID workaround "
519 "activated for target GUID %016llx\n",
520 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 521 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 522 memcpy(req->priv.initiator_port_id + 8,
05321937 523 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 524 }
aef9ec39
RD		 525
526 status = ib_send_cm_req(target->cm_id, &req->param);
527
528 kfree(req);
529
530 return status;
531}
532
ef6c49d8
BVA		 533static bool srp_queue_remove_work(struct srp_target_port *target)
534{
535 bool changed = false;
536
537 spin_lock_irq(&target->lock);
538 if (target->state != SRP_TARGET_REMOVED) {
539 target->state = SRP_TARGET_REMOVED;
540 changed = true;
541 }
542 spin_unlock_irq(&target->lock);
543
544 if (changed)
545 queue_work(system_long_wq, &target->remove_work);
546
547 return changed;
548}
549
294c875a
BVA		 550static bool srp_change_conn_state(struct srp_target_port *target,
551 bool connected)
552{
553 bool changed = false;
554
555 spin_lock_irq(&target->lock);
556 if (target->connected != connected) {
557 target->connected = connected;
558 changed = true;
559 }
560 spin_unlock_irq(&target->lock);
561
562 return changed;
563}
564
aef9ec39
RD		 565static void srp_disconnect_target(struct srp_target_port *target)
566{
294c875a
BVA		 567 if (srp_change_conn_state(target, false)) {
568 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 569
294c875a
BVA		 570 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
571 shost_printk(KERN_DEBUG, target->scsi_host,
572 PFX "Sending CM DREQ failed\n");
294c875a 573 }
e6581056 574 }
aef9ec39
RD		 575}
576
8f26c9ff
DD		 577static void srp_free_req_data(struct srp_target_port *target)
578{
c07d424d 579 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
8f26c9ff
DD		 580 struct srp_request *req;
581 int i;
582
4d73f95f
BVA		 583 if (!target->req_ring)
584 return;
585
586 for (i = 0; i < target->req_ring_size; ++i) {
587 req = &target->req_ring[i];
8f26c9ff
DD		 588 kfree(req->fmr_list);
589 kfree(req->map_page);
c07d424d
DD		 590 if (req->indirect_dma_addr) {
591 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
592 target->indirect_size,
593 DMA_TO_DEVICE);
594 }
595 kfree(req->indirect_desc);
8f26c9ff 596 }
4d73f95f
BVA		 597
598 kfree(target->req_ring);
599 target->req_ring = NULL;
8f26c9ff
DD		 600}
601
b81d00bd
BVA		 602static int srp_alloc_req_data(struct srp_target_port *target)
603{
604 struct srp_device *srp_dev = target->srp_host->srp_dev;
605 struct ib_device *ibdev = srp_dev->dev;
606 struct srp_request *req;
607 dma_addr_t dma_addr;
608 int i, ret = -ENOMEM;
609
610 INIT_LIST_HEAD(&target->free_reqs);
611
4d73f95f
BVA		 612 target->req_ring = kzalloc(target->req_ring_size *
613 sizeof(*target->req_ring), GFP_KERNEL);
614 if (!target->req_ring)
615 goto out;
616
617 for (i = 0; i < target->req_ring_size; ++i) {
b81d00bd
BVA		 618 req = &target->req_ring[i];
619 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
620 GFP_KERNEL);
621 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof(void *),
622 GFP_KERNEL);
623 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
624 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
625 goto out;
626
627 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
628 target->indirect_size,
629 DMA_TO_DEVICE);
630 if (ib_dma_mapping_error(ibdev, dma_addr))
631 goto out;
632
633 req->indirect_dma_addr = dma_addr;
634 req->index = i;
635 list_add_tail(&req->list, &target->free_reqs);
636 }
637 ret = 0;
638
639out:
640 return ret;
641}
642
683b159a
BVA		 643/**
644 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
645 * @shost: SCSI host whose attributes to remove from sysfs.
646 *
647 * Note: Any attributes defined in the host template and that did not exist
648 * before invocation of this function will be ignored.
649 */
650static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
651{
652 struct device_attribute **attr;
653
654 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
655 device_remove_file(&shost->shost_dev, *attr);
656}
657
ee12d6a8
BVA		 658static void srp_remove_target(struct srp_target_port *target)
659{
ef6c49d8
BVA		 660 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
661
ee12d6a8 662 srp_del_scsi_host_attr(target->scsi_host);
9dd69a60 663 srp_rport_get(target->rport);
ee12d6a8
BVA		 664 srp_remove_host(target->scsi_host);
665 scsi_remove_host(target->scsi_host);
93079162 666 srp_stop_rport_timers(target->rport);
ef6c49d8 667 srp_disconnect_target(target);
ee12d6a8
BVA		 668 ib_destroy_cm_id(target->cm_id);
669 srp_free_target_ib(target);
c1120f89 670 cancel_work_sync(&target->tl_err_work);
9dd69a60 671 srp_rport_put(target->rport);
ee12d6a8 672 srp_free_req_data(target);
65d7dd2f
VP		 673
674 spin_lock(&target->srp_host->target_lock);
675 list_del(&target->list);
676 spin_unlock(&target->srp_host->target_lock);
677
ee12d6a8
BVA		 678 scsi_host_put(target->scsi_host);
679}
680
c4028958 681static void srp_remove_work(struct work_struct *work)
aef9ec39 682{
c4028958 683 struct srp_target_port *target =
ef6c49d8 684 container_of(work, struct srp_target_port, remove_work);
aef9ec39 685
ef6c49d8 686 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 687
96fc248a 688 srp_remove_target(target);
aef9ec39
RD		 689}
690
dc1bdbd9
BVA		 691static void srp_rport_delete(struct srp_rport *rport)
692{
693 struct srp_target_port *target = rport->lld_data;
694
695 srp_queue_remove_work(target);
696}
697
aef9ec39
RD		 698static int srp_connect_target(struct srp_target_port *target)
699{
9fe4bcf4 700 int retries = 3;
aef9ec39
RD		 701 int ret;
702
294c875a
BVA		 703 WARN_ON_ONCE(target->connected);
704
948d1e88
BVA		 705 target->qp_in_error = false;
706
aef9ec39
RD		 707 ret = srp_lookup_path(target);
708 if (ret)
709 return ret;
710
711 while (1) {
712 init_completion(&target->done);
713 ret = srp_send_req(target);
714 if (ret)
715 return ret;
a702adce
BVA		 716 ret = wait_for_completion_interruptible(&target->done);
717 if (ret < 0)
718 return ret;
aef9ec39
RD		 719
720 /*
721 * The CM event handling code will set status to
722 * SRP_PORT_REDIRECT if we get a port redirect REJ
723 * back, or SRP_DLID_REDIRECT if we get a lid/qp
724 * redirect REJ back.
725 */
726 switch (target->status) {
727 case 0:
294c875a 728 srp_change_conn_state(target, true);
aef9ec39
RD		 729 return 0;
730
731 case SRP_PORT_REDIRECT:
732 ret = srp_lookup_path(target);
733 if (ret)
734 return ret;
735 break;
736
737 case SRP_DLID_REDIRECT:
738 break;
739
9fe4bcf4
DD		 740 case SRP_STALE_CONN:
741 /* Our current CM id was stale, and is now in timewait.
742 * Try to reconnect with a new one.
743 */
744 if (!retries-- || srp_new_cm_id(target)) {
745 shost_printk(KERN_ERR, target->scsi_host, PFX
746 "giving up on stale connection\n");
747 target->status = -ECONNRESET;
748 return target->status;
749 }
750
751 shost_printk(KERN_ERR, target->scsi_host, PFX
752 "retrying stale connection\n");
753 break;
754
aef9ec39
RD		 755 default:
756 return target->status;
757 }
758 }
759}
760
d945e1df
RD		 761static void srp_unmap_data(struct scsi_cmnd *scmnd,
762 struct srp_target_port *target,
763 struct srp_request *req)
764{
8f26c9ff
DD		 765 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
766 struct ib_pool_fmr **pfmr;
767
bb350d1d 768 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 769 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
770 scmnd->sc_data_direction != DMA_FROM_DEVICE))
771 return;
772
8f26c9ff
DD		 773 pfmr = req->fmr_list;
774 while (req->nfmr--)
775 ib_fmr_pool_unmap(*pfmr++);
f5358a17 776
8f26c9ff
DD		 777 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
778 scmnd->sc_data_direction);
d945e1df
RD		 779}
780
22032991
BVA		 781/**
782 * srp_claim_req - Take ownership of the scmnd associated with a request.
783 * @target: SRP target port.
784 * @req: SRP request.
b3fe628d 785 * @sdev: If not NULL, only take ownership for this SCSI device.
22032991
BVA		 786 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
787 * ownership of @req->scmnd if it equals @scmnd.
788 *
789 * Return value:
790 * Either NULL or a pointer to the SCSI command the caller became owner of.
791 */
792static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
793 struct srp_request *req,
b3fe628d 794 struct scsi_device *sdev,
22032991
BVA		 795 struct scsi_cmnd *scmnd)
796{
797 unsigned long flags;
798
799 spin_lock_irqsave(&target->lock, flags);
b3fe628d
BVA		 800 if (req->scmnd &&
801 (!sdev || req->scmnd->device == sdev) &&
802 (!scmnd || req->scmnd == scmnd)) {
22032991
BVA		 803 scmnd = req->scmnd;
804 req->scmnd = NULL;
22032991
BVA		 805 } else {
806 scmnd = NULL;
807 }
808 spin_unlock_irqrestore(&target->lock, flags);
809
810 return scmnd;
811}
812
813/**
814 * srp_free_req() - Unmap data and add request to the free request list.
af24663b
BVA		 815 * @target: SRP target port.
816 * @req: Request to be freed.
817 * @scmnd: SCSI command associated with @req.
818 * @req_lim_delta: Amount to be added to @target->req_lim.
22032991
BVA		 819 */
820static void srp_free_req(struct srp_target_port *target,
821 struct srp_request *req, struct scsi_cmnd *scmnd,
822 s32 req_lim_delta)
526b4caa 823{
94a9174c
BVA		 824 unsigned long flags;
825
22032991
BVA		 826 srp_unmap_data(scmnd, target, req);
827
e9684678 828 spin_lock_irqsave(&target->lock, flags);
94a9174c 829 target->req_lim += req_lim_delta;
536ae14e 830 list_add_tail(&req->list, &target->free_reqs);
e9684678 831 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 832}
833
ed9b2264 834static void srp_finish_req(struct srp_target_port *target,
b3fe628d
BVA		 835 struct srp_request *req, struct scsi_device *sdev,
836 int result)
526b4caa 837{
b3fe628d 838 struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
22032991
BVA		 839
840 if (scmnd) {
9b796d06 841 srp_free_req(target, req, scmnd, 0);
ed9b2264 842 scmnd->result = result;
22032991 843 scmnd->scsi_done(scmnd);
22032991 844 }
526b4caa
IR		 845}
846
ed9b2264 847static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 848{
ed9b2264 849 struct srp_target_port *target = rport->lld_data;
b3fe628d
BVA		 850 struct Scsi_Host *shost = target->scsi_host;
851 struct scsi_device *sdev;
ed9b2264
BVA		 852 int i;
853
b3fe628d
BVA		 854 /*
855 * Invoking srp_terminate_io() while srp_queuecommand() is running
856 * is not safe. Hence the warning statement below.
857 */
858 shost_for_each_device(sdev, shost)
859 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
860
4d73f95f 861 for (i = 0; i < target->req_ring_size; ++i) {
ed9b2264 862 struct srp_request *req = &target->req_ring[i];
b3fe628d 863 srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
ed9b2264
BVA		 864 }
865}
aef9ec39 866
ed9b2264
BVA		 867/*
868 * It is up to the caller to ensure that srp_rport_reconnect() calls are
869 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
870 * srp_reset_device() or srp_reset_host() calls will occur while this function
871 * is in progress. One way to realize that is not to call this function
872 * directly but to call srp_reconnect_rport() instead since that last function
873 * serializes calls of this function via rport->mutex and also blocks
874 * srp_queuecommand() calls before invoking this function.
875 */
876static int srp_rport_reconnect(struct srp_rport *rport)
877{
878 struct srp_target_port *target = rport->lld_data;
879 int i, ret;
09be70a2 880
aef9ec39
RD		 881 srp_disconnect_target(target);
882 /*
c7c4e7ff
BVA		 883 * Now get a new local CM ID so that we avoid confusing the target in
884 * case things are really fouled up. Doing so also ensures that all CM
885 * callbacks will have finished before a new QP is allocated.
aef9ec39 886 */
9fe4bcf4 887 ret = srp_new_cm_id(target);
c7c4e7ff
BVA		 888 /*
889 * Whether or not creating a new CM ID succeeded, create a new
890 * QP. This guarantees that all completion callback function
891 * invocations have finished before request resetting starts.
892 */
893 if (ret == 0)
894 ret = srp_create_target_ib(target);
895 else
896 srp_create_target_ib(target);
aef9ec39 897
4d73f95f 898 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 899 struct srp_request *req = &target->req_ring[i];
b3fe628d 900 srp_finish_req(target, req, NULL, DID_RESET << 16);
536ae14e 901 }
aef9ec39 902
536ae14e 903 INIT_LIST_HEAD(&target->free_tx);
4d73f95f 904 for (i = 0; i < target->queue_size; ++i)
536ae14e 905 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 906
c7c4e7ff
BVA		 907 if (ret == 0)
908 ret = srp_connect_target(target);
09be70a2 909
ed9b2264
BVA		 910 if (ret == 0)
911 shost_printk(KERN_INFO, target->scsi_host,
912 PFX "reconnect succeeded\n");
aef9ec39
RD		 913
914 return ret;
915}
916
8f26c9ff
DD		 917static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
918 unsigned int dma_len, u32 rkey)
f5358a17 919{
8f26c9ff 920 struct srp_direct_buf *desc = state->desc;
f5358a17 921
8f26c9ff
DD		 922 desc->va = cpu_to_be64(dma_addr);
923 desc->key = cpu_to_be32(rkey);
924 desc->len = cpu_to_be32(dma_len);
f5358a17 925
8f26c9ff
DD		 926 state->total_len += dma_len;
927 state->desc++;
928 state->ndesc++;
929}
559ce8f1 930
8f26c9ff
DD		 931static int srp_map_finish_fmr(struct srp_map_state *state,
932 struct srp_target_port *target)
933{
934 struct srp_device *dev = target->srp_host->srp_dev;
935 struct ib_pool_fmr *fmr;
936 u64 io_addr = 0;
85507bcc 937
8f26c9ff
DD		 938 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
939 state->npages, io_addr);
940 if (IS_ERR(fmr))
941 return PTR_ERR(fmr);
f5358a17 942
8f26c9ff
DD		 943 *state->next_fmr++ = fmr;
944 state->nfmr++;
f5358a17 945
8f26c9ff 946 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
539dde6f 947
8f26c9ff
DD		 948 return 0;
949}
950
539dde6f
BVA		 951static int srp_finish_mapping(struct srp_map_state *state,
952 struct srp_target_port *target)
953{
954 int ret = 0;
955
956 if (state->npages == 0)
957 return 0;
958
959 if (state->npages == 1)
960 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
961 target->rkey);
962 else
963 ret = srp_map_finish_fmr(state, target);
964
965 if (ret == 0) {
966 state->npages = 0;
967 state->fmr_len = 0;
968 }
969
970 return ret;
971}
972
8f26c9ff
DD		 973static void srp_map_update_start(struct srp_map_state *state,
974 struct scatterlist *sg, int sg_index,
975 dma_addr_t dma_addr)
976{
977 state->unmapped_sg = sg;
978 state->unmapped_index = sg_index;
979 state->unmapped_addr = dma_addr;
980}
85507bcc 981
8f26c9ff
DD		 982static int srp_map_sg_entry(struct srp_map_state *state,
983 struct srp_target_port *target,
984 struct scatterlist *sg, int sg_index,
985 int use_fmr)
986{
987 struct srp_device *dev = target->srp_host->srp_dev;
988 struct ib_device *ibdev = dev->dev;
989 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
990 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
991 unsigned int len;
992 int ret;
993
994 if (!dma_len)
995 return 0;
996
997 if (use_fmr == SRP_MAP_NO_FMR) {
998 /* Once we're in direct map mode for a request, we don't
999 * go back to FMR mode, so no need to update anything
1000 * other than the descriptor.
1001 */
1002 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1003 return 0;
85507bcc 1004 }
f5358a17 1005
8f26c9ff
DD		 1006 /* If we start at an offset into the FMR page, don't merge into
1007 * the current FMR. Finish it out, and use the kernel's MR for this
1008 * sg entry. This is to avoid potential bugs on some SRP targets
1009 * that were never quite defined, but went away when the initiator
1010 * avoided using FMR on such page fragments.
1011 */
1012 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
539dde6f 1013 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1014 if (ret)
1015 return ret;
1016
1017 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1018 srp_map_update_start(state, NULL, 0, 0);
1019 return 0;
f5358a17
RD		 1020 }
1021
8f26c9ff
DD		 1022 /* If this is the first sg to go into the FMR, save our position.
1023 * We need to know the first unmapped entry, its index, and the
1024 * first unmapped address within that entry to be able to restart
1025 * mapping after an error.
1026 */
1027 if (!state->unmapped_sg)
1028 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 1029
8f26c9ff
DD		 1030 while (dma_len) {
1031 if (state->npages == SRP_FMR_SIZE) {
539dde6f 1032 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1033 if (ret)
1034 return ret;
f5358a17 1035
8f26c9ff
DD		 1036 srp_map_update_start(state, sg, sg_index, dma_addr);
1037 }
1038
1039 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
f5358a17 1040
8f26c9ff
DD		 1041 if (!state->npages)
1042 state->base_dma_addr = dma_addr;
1043 state->pages[state->npages++] = dma_addr;
1044 state->fmr_len += len;
1045 dma_addr += len;
1046 dma_len -= len;
1047 }
1048
1049 /* If the last entry of the FMR wasn't a full page, then we need to
1050 * close it out and start a new one -- we can only merge at page
1051 * boundries.
1052 */
1053 ret = 0;
1054 if (len != dev->fmr_page_size) {
539dde6f 1055 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1056 if (!ret)
1057 srp_map_update_start(state, NULL, 0, 0);
1058 }
f5358a17
RD		 1059 return ret;
1060}
1061
76bc1e1d
BVA		 1062static void srp_map_fmr(struct srp_map_state *state,
1063 struct srp_target_port *target, struct srp_request *req,
1064 struct scatterlist *scat, int count)
1065{
1066 struct srp_device *dev = target->srp_host->srp_dev;
1067 struct ib_device *ibdev = dev->dev;
1068 struct scatterlist *sg;
1069 int i, use_fmr;
1070
1071 state->desc = req->indirect_desc;
1072 state->pages = req->map_page;
1073 state->next_fmr = req->fmr_list;
1074
1075 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
1076
1077 for_each_sg(scat, sg, count, i) {
1078 if (srp_map_sg_entry(state, target, sg, i, use_fmr)) {
1079 /* FMR mapping failed, so backtrack to the first
1080 * unmapped entry and continue on without using FMR.
1081 */
1082 dma_addr_t dma_addr;
1083 unsigned int dma_len;
1084
1085backtrack:
1086 sg = state->unmapped_sg;
1087 i = state->unmapped_index;
1088
1089 dma_addr = ib_sg_dma_address(ibdev, sg);
1090 dma_len = ib_sg_dma_len(ibdev, sg);
1091 dma_len -= (state->unmapped_addr - dma_addr);
1092 dma_addr = state->unmapped_addr;
1093 use_fmr = SRP_MAP_NO_FMR;
1094 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1095 }
1096 }
1097
539dde6f 1098 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_finish_mapping(state, target))
76bc1e1d
BVA		 1099 goto backtrack;
1100
1101 req->nfmr = state->nfmr;
1102}
1103
aef9ec39
RD		 1104static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1105 struct srp_request *req)
1106{
76bc1e1d 1107 struct scatterlist *scat;
aef9ec39 1108 struct srp_cmd *cmd = req->cmd->buf;
76bc1e1d 1109 int len, nents, count;
85507bcc
RC		 1110 struct srp_device *dev;
1111 struct ib_device *ibdev;
8f26c9ff
DD		 1112 struct srp_map_state state;
1113 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 1114 u32 table_len;
1115 u8 fmt;
aef9ec39 1116
bb350d1d 1117 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 1118 return sizeof (struct srp_cmd);
1119
1120 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1121 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 1122 shost_printk(KERN_WARNING, target->scsi_host,
1123 PFX "Unhandled data direction %d\n",
1124 scmnd->sc_data_direction);
aef9ec39
RD		 1125 return -EINVAL;
1126 }
1127
bb350d1d
FT		 1128 nents = scsi_sg_count(scmnd);
1129 scat = scsi_sglist(scmnd);
aef9ec39 1130
05321937 1131 dev = target->srp_host->srp_dev;
85507bcc
RC		 1132 ibdev = dev->dev;
1133
1134 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 1135 if (unlikely(count == 0))
1136 return -EIO;
f5358a17
RD		 1137
1138 fmt = SRP_DATA_DESC_DIRECT;
1139 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1140
cf368713 1141 if (count == 1) {
f5358a17
RD		 1142 /*
1143 * The midlayer only generated a single gather/scatter
1144 * entry, or DMA mapping coalesced everything to a
1145 * single entry. So a direct descriptor along with
1146 * the DMA MR suffices.
1147 */
cf368713 1148 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1149
85507bcc 1150 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1151 buf->key = cpu_to_be32(target->rkey);
85507bcc 1152 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff
DD		 1153
1154 req->nfmr = 0;
1155 goto map_complete;
1156 }
1157
1158 /* We have more than one scatter/gather entry, so build our indirect
1159 * descriptor table, trying to merge as many entries with FMR as we
1160 * can.
1161 */
1162 indirect_hdr = (void *) cmd->add_data;
1163
c07d424d
DD		 1164 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1165 target->indirect_size, DMA_TO_DEVICE);
1166
8f26c9ff 1167 memset(&state, 0, sizeof(state));
76bc1e1d 1168 srp_map_fmr(&state, target, req, scat, count);
cf368713 1169
c07d424d
DD		 1170 /* We've mapped the request, now pull as much of the indirect
1171 * descriptor table as we can into the command buffer. If this
1172 * target is not using an external indirect table, we are
1173 * guaranteed to fit into the command, as the SCSI layer won't
1174 * give us more S/G entries than we allow.
8f26c9ff 1175 */
8f26c9ff
DD		 1176 if (state.ndesc == 1) {
1177 /* FMR mapping was able to collapse this to one entry,
1178 * so use a direct descriptor.
1179 */
1180 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1181
c07d424d 1182 *buf = req->indirect_desc[0];
8f26c9ff 1183 goto map_complete;
aef9ec39
RD		 1184 }
1185
c07d424d
DD		 1186 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1187 !target->allow_ext_sg)) {
1188 shost_printk(KERN_ERR, target->scsi_host,
1189 "Could not fit S/G list into SRP_CMD\n");
1190 return -EIO;
1191 }
1192
1193 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1194 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1195
1196 fmt = SRP_DATA_DESC_INDIRECT;
1197 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1198 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1199
c07d424d
DD		 1200 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1201 count * sizeof (struct srp_direct_buf));
8f26c9ff 1202
c07d424d 1203 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1204 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1205 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1206 indirect_hdr->len = cpu_to_be32(state.total_len);
1207
1208 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1209 cmd->data_out_desc_cnt = count;
8f26c9ff 1210 else
c07d424d
DD		 1211 cmd->data_in_desc_cnt = count;
1212
1213 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1214 DMA_TO_DEVICE);
8f26c9ff
DD		 1215
1216map_complete:
aef9ec39
RD		 1217 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1218 cmd->buf_fmt = fmt << 4;
1219 else
1220 cmd->buf_fmt = fmt;
1221
aef9ec39
RD		 1222 return len;
1223}
1224
76c75b25
BVA		 1225/*
1226 * Return an IU and possible credit to the free pool
1227 */
1228static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1229 enum srp_iu_type iu_type)
1230{
1231 unsigned long flags;
1232
e9684678 1233 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1234 list_add(&iu->list, &target->free_tx);
1235 if (iu_type != SRP_IU_RSP)
1236 ++target->req_lim;
e9684678 1237 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1238}
1239
05a1d750 1240/*
e9684678
BVA		 1241 * Must be called with target->lock held to protect req_lim and free_tx.
1242 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1243 *
1244 * Note:
1245 * An upper limit for the number of allocated information units for each
1246 * request type is:
1247 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1248 * more than Scsi_Host.can_queue requests.
1249 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1250 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1251 * one unanswered SRP request to an initiator.
1252 */
1253static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1254 enum srp_iu_type iu_type)
1255{
1256 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1257 struct srp_iu *iu;
1258
1259 srp_send_completion(target->send_cq, target);
1260
dcb4cb85 1261 if (list_empty(&target->free_tx))
05a1d750
DD		 1262 return NULL;
1263
1264 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1265 if (iu_type != SRP_IU_RSP) {
1266 if (target->req_lim <= rsv) {
1267 ++target->zero_req_lim;
1268 return NULL;
1269 }
1270
1271 --target->req_lim;
05a1d750
DD		 1272 }
1273
dcb4cb85 1274 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1275 list_del(&iu->list);
05a1d750
DD		 1276 return iu;
1277}
1278
76c75b25
BVA		 1279static int srp_post_send(struct srp_target_port *target,
1280 struct srp_iu *iu, int len)
05a1d750
DD		 1281{
1282 struct ib_sge list;
1283 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1284
1285 list.addr = iu->dma;
1286 list.length = len;
9af76271 1287 list.lkey = target->lkey;
05a1d750
DD		 1288
1289 wr.next = NULL;
dcb4cb85 1290 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1291 wr.sg_list = &list;
1292 wr.num_sge = 1;
1293 wr.opcode = IB_WR_SEND;
1294 wr.send_flags = IB_SEND_SIGNALED;
1295
76c75b25 1296 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1297}
1298
dcb4cb85 1299static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1300{
c996bb47 1301 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1302 struct ib_sge list;
c996bb47
BVA		 1303
1304 list.addr = iu->dma;
1305 list.length = iu->size;
9af76271 1306 list.lkey = target->lkey;
c996bb47
BVA		 1307
1308 wr.next = NULL;
dcb4cb85 1309 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1310 wr.sg_list = &list;
1311 wr.num_sge = 1;
1312
dcb4cb85 1313 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1314}
1315
aef9ec39
RD		 1316static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1317{
1318 struct srp_request *req;
1319 struct scsi_cmnd *scmnd;
1320 unsigned long flags;
aef9ec39 1321
aef9ec39 1322 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1323 spin_lock_irqsave(&target->lock, flags);
94a9174c 1324 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1325 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1326
f8b6e31e
DD		 1327 target->tsk_mgmt_status = -1;
1328 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1329 target->tsk_mgmt_status = rsp->data[3];
1330 complete(&target->tsk_mgmt_done);
aef9ec39 1331 } else {
f8b6e31e 1332 req = &target->req_ring[rsp->tag];
b3fe628d 1333 scmnd = srp_claim_req(target, req, NULL, NULL);
22032991 1334 if (!scmnd) {
7aa54bd7
DD		 1335 shost_printk(KERN_ERR, target->scsi_host,
1336 "Null scmnd for RSP w/tag %016llx\n",
1337 (unsigned long long) rsp->tag);
22032991
BVA		 1338
1339 spin_lock_irqsave(&target->lock, flags);
1340 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1341 spin_unlock_irqrestore(&target->lock, flags);
1342
1343 return;
1344 }
aef9ec39
RD		 1345 scmnd->result = rsp->status;
1346
1347 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1348 memcpy(scmnd->sense_buffer, rsp->data +
1349 be32_to_cpu(rsp->resp_data_len),
1350 min_t(int, be32_to_cpu(rsp->sense_data_len),
1351 SCSI_SENSE_BUFFERSIZE));
1352 }
1353
1354 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1355 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1356 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1357 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1358
22032991
BVA		 1359 srp_free_req(target, req, scmnd,
1360 be32_to_cpu(rsp->req_lim_delta));
1361
f8b6e31e
DD		 1362 scmnd->host_scribble = NULL;
1363 scmnd->scsi_done(scmnd);
aef9ec39 1364 }
aef9ec39
RD		 1365}
1366
bb12588a
DD		 1367static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1368 void *rsp, int len)
1369{
76c75b25 1370 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1371 unsigned long flags;
1372 struct srp_iu *iu;
76c75b25 1373 int err;
bb12588a 1374
e9684678 1375 spin_lock_irqsave(&target->lock, flags);
bb12588a 1376 target->req_lim += req_delta;
bb12588a 1377 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1378 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1379
bb12588a
DD		 1380 if (!iu) {
1381 shost_printk(KERN_ERR, target->scsi_host, PFX
1382 "no IU available to send response\n");
76c75b25 1383 return 1;
bb12588a
DD		 1384 }
1385
1386 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1387 memcpy(iu->buf, rsp, len);
1388 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1389
76c75b25
BVA		 1390 err = srp_post_send(target, iu, len);
1391 if (err) {
bb12588a
DD		 1392 shost_printk(KERN_ERR, target->scsi_host, PFX
1393 "unable to post response: %d\n", err);
76c75b25
BVA		 1394 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1395 }
bb12588a 1396
bb12588a
DD		 1397 return err;
1398}
1399
1400static void srp_process_cred_req(struct srp_target_port *target,
1401 struct srp_cred_req *req)
1402{
1403 struct srp_cred_rsp rsp = {
1404 .opcode = SRP_CRED_RSP,
1405 .tag = req->tag,
1406 };
1407 s32 delta = be32_to_cpu(req->req_lim_delta);
1408
1409 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1410 shost_printk(KERN_ERR, target->scsi_host, PFX
1411 "problems processing SRP_CRED_REQ\n");
1412}
1413
1414static void srp_process_aer_req(struct srp_target_port *target,
1415 struct srp_aer_req *req)
1416{
1417 struct srp_aer_rsp rsp = {
1418 .opcode = SRP_AER_RSP,
1419 .tag = req->tag,
1420 };
1421 s32 delta = be32_to_cpu(req->req_lim_delta);
1422
1423 shost_printk(KERN_ERR, target->scsi_host, PFX
1424 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1425
1426 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1427 shost_printk(KERN_ERR, target->scsi_host, PFX
1428 "problems processing SRP_AER_REQ\n");
1429}
1430
aef9ec39
RD		 1431static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1432{
dcb4cb85 1433 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1434 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1435 int res;
aef9ec39
RD		 1436 u8 opcode;
1437
85507bcc
RC		 1438 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1439 DMA_FROM_DEVICE);
aef9ec39
RD		 1440
1441 opcode = *(u8 *) iu->buf;
1442
1443 if (0) {
7aa54bd7
DD		 1444 shost_printk(KERN_ERR, target->scsi_host,
1445 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1446 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1447 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1448 }
1449
1450 switch (opcode) {
1451 case SRP_RSP:
1452 srp_process_rsp(target, iu->buf);
1453 break;
1454
bb12588a
DD		 1455 case SRP_CRED_REQ:
1456 srp_process_cred_req(target, iu->buf);
1457 break;
1458
1459 case SRP_AER_REQ:
1460 srp_process_aer_req(target, iu->buf);
1461 break;
1462
aef9ec39
RD		 1463 case SRP_T_LOGOUT:
1464 /* XXX Handle target logout */
7aa54bd7
DD		 1465 shost_printk(KERN_WARNING, target->scsi_host,
1466 PFX "Got target logout request\n");
aef9ec39
RD		 1467 break;
1468
1469 default:
7aa54bd7
DD		 1470 shost_printk(KERN_WARNING, target->scsi_host,
1471 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1472 break;
1473 }
1474
85507bcc
RC		 1475 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1476 DMA_FROM_DEVICE);
c996bb47 1477
dcb4cb85 1478 res = srp_post_recv(target, iu);
c996bb47
BVA		 1479 if (res != 0)
1480 shost_printk(KERN_ERR, target->scsi_host,
1481 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1482}
1483
c1120f89
BVA		 1484/**
1485 * srp_tl_err_work() - handle a transport layer error
af24663b 1486 * @work: Work structure embedded in an SRP target port.
c1120f89
BVA		 1487 *
1488 * Note: This function may get invoked before the rport has been created,
1489 * hence the target->rport test.
1490 */
1491static void srp_tl_err_work(struct work_struct *work)
1492{
1493 struct srp_target_port *target;
1494
1495 target = container_of(work, struct srp_target_port, tl_err_work);
1496 if (target->rport)
1497 srp_start_tl_fail_timers(target->rport);
1498}
1499
cd4e3854 1500static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
948d1e88
BVA		 1501 struct srp_target_port *target)
1502{
294c875a 1503 if (target->connected && !target->qp_in_error) {
4f0af697
BVA		 1504 shost_printk(KERN_ERR, target->scsi_host,
1505 PFX "failed %s status %d\n",
cd4e3854 1506 send_err ? "send" : "receive",
4f0af697 1507 wc_status);
c1120f89 1508 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1509 }
948d1e88
BVA		 1510 target->qp_in_error = true;
1511}
1512
9c03dc9f 1513static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1514{
1515 struct srp_target_port *target = target_ptr;
1516 struct ib_wc wc;
aef9ec39
RD		 1517
1518 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1519 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1520 if (likely(wc.status == IB_WC_SUCCESS)) {
1521 srp_handle_recv(target, &wc);
1522 } else {
cd4e3854 1523 srp_handle_qp_err(wc.status, false, target);
aef9ec39 1524 }
9c03dc9f
BVA		 1525 }
1526}
1527
1528static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1529{
1530 struct srp_target_port *target = target_ptr;
1531 struct ib_wc wc;
dcb4cb85 1532 struct srp_iu *iu;
9c03dc9f
BVA		 1533
1534 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1535 if (likely(wc.status == IB_WC_SUCCESS)) {
1536 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1537 list_add(&iu->list, &target->free_tx);
1538 } else {
cd4e3854 1539 srp_handle_qp_err(wc.status, true, target);
9c03dc9f 1540 }
aef9ec39
RD		 1541 }
1542}
1543
76c75b25 1544static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1545{
76c75b25 1546 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1547 struct srp_rport *rport = target->rport;
aef9ec39
RD		 1548 struct srp_request *req;
1549 struct srp_iu *iu;
1550 struct srp_cmd *cmd;
85507bcc 1551 struct ib_device *dev;
76c75b25 1552 unsigned long flags;
ed9b2264 1553 int len, result;
a95cadb9
BVA		 1554 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1555
1556 /*
1557 * The SCSI EH thread is the only context from which srp_queuecommand()
1558 * can get invoked for blocked devices (SDEV_BLOCK /
1559 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1560 * locking the rport mutex if invoked from inside the SCSI EH.
1561 */
1562 if (in_scsi_eh)
1563 mutex_lock(&rport->mutex);
aef9ec39 1564
ed9b2264
BVA		 1565 result = srp_chkready(target->rport);
1566 if (unlikely(result)) {
1567 scmnd->result = result;
2ce19e72 1568 scmnd->scsi_done(scmnd);
a95cadb9 1569 goto unlock_rport;
2ce19e72
BVA		 1570 }
1571
e9684678 1572 spin_lock_irqsave(&target->lock, flags);
bb12588a 1573 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1574 if (!iu)
695b8349
BVA		 1575 goto err_unlock;
1576
1577 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1578 list_del(&req->list);
1579 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1580
05321937 1581 dev = target->srp_host->srp_dev->dev;
49248644 1582 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1583 DMA_TO_DEVICE);
aef9ec39 1584
aef9ec39 1585 scmnd->result = 0;
f8b6e31e 1586 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1587
1588 cmd = iu->buf;
1589 memset(cmd, 0, sizeof *cmd);
1590
1591 cmd->opcode = SRP_CMD;
1592 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1593 cmd->tag = req->index;
aef9ec39
RD		 1594 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1595
aef9ec39
RD		 1596 req->scmnd = scmnd;
1597 req->cmd = iu;
aef9ec39
RD		 1598
1599 len = srp_map_data(scmnd, target, req);
1600 if (len < 0) {
7aa54bd7
DD		 1601 shost_printk(KERN_ERR, target->scsi_host,
1602 PFX "Failed to map data\n");
76c75b25 1603 goto err_iu;
aef9ec39
RD		 1604 }
1605
49248644 1606 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1607 DMA_TO_DEVICE);
aef9ec39 1608
76c75b25 1609 if (srp_post_send(target, iu, len)) {
7aa54bd7 1610 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1611 goto err_unmap;
1612 }
1613
a95cadb9
BVA		 1614unlock_rport:
1615 if (in_scsi_eh)
1616 mutex_unlock(&rport->mutex);
1617
aef9ec39
RD		 1618 return 0;
1619
1620err_unmap:
1621 srp_unmap_data(scmnd, target, req);
1622
76c75b25
BVA		 1623err_iu:
1624 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1625
024ca901
BVA		 1626 /*
1627 * Avoid that the loops that iterate over the request ring can
1628 * encounter a dangling SCSI command pointer.
1629 */
1630 req->scmnd = NULL;
1631
e9684678 1632 spin_lock_irqsave(&target->lock, flags);
76c75b25 1633 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1634
1635err_unlock:
e9684678 1636 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1637
a95cadb9
BVA		 1638 if (in_scsi_eh)
1639 mutex_unlock(&rport->mutex);
1640
aef9ec39
RD		 1641 return SCSI_MLQUEUE_HOST_BUSY;
1642}
1643
4d73f95f
BVA		 1644/*
1645 * Note: the resources allocated in this function are freed in
1646 * srp_free_target_ib().
1647 */
aef9ec39
RD		 1648static int srp_alloc_iu_bufs(struct srp_target_port *target)
1649{
1650 int i;
1651
4d73f95f
BVA		 1652 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1653 GFP_KERNEL);
1654 if (!target->rx_ring)
1655 goto err_no_ring;
1656 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1657 GFP_KERNEL);
1658 if (!target->tx_ring)
1659 goto err_no_ring;
1660
1661 for (i = 0; i < target->queue_size; ++i) {
aef9ec39
RD		 1662 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1663 target->max_ti_iu_len,
1664 GFP_KERNEL, DMA_FROM_DEVICE);
1665 if (!target->rx_ring[i])
1666 goto err;
1667 }
1668
4d73f95f 1669 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1670 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1671 target->max_iu_len,
aef9ec39
RD		 1672 GFP_KERNEL, DMA_TO_DEVICE);
1673 if (!target->tx_ring[i])
1674 goto err;
dcb4cb85
BVA		 1675
1676 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1677 }
1678
1679 return 0;
1680
1681err:
4d73f95f 1682 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1683 srp_free_iu(target->srp_host, target->rx_ring[i]);
aef9ec39 1684 srp_free_iu(target->srp_host, target->tx_ring[i]);
aef9ec39
RD		 1685 }
1686
4d73f95f
BVA		 1687
1688err_no_ring:
1689 kfree(target->tx_ring);
1690 target->tx_ring = NULL;
1691 kfree(target->rx_ring);
1692 target->rx_ring = NULL;
1693
aef9ec39
RD		 1694 return -ENOMEM;
1695}
1696
c9b03c1a
BVA		 1697static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1698{
1699 uint64_t T_tr_ns, max_compl_time_ms;
1700 uint32_t rq_tmo_jiffies;
1701
1702 /*
1703 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1704 * table 91), both the QP timeout and the retry count have to be set
1705 * for RC QP's during the RTR to RTS transition.
1706 */
1707 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1708 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1709
1710 /*
1711 * Set target->rq_tmo_jiffies to one second more than the largest time
1712 * it can take before an error completion is generated. See also
1713 * C9-140..142 in the IBTA spec for more information about how to
1714 * convert the QP Local ACK Timeout value to nanoseconds.
1715 */
1716 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1717 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1718 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1719 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1720
1721 return rq_tmo_jiffies;
1722}
1723
961e0be8
DD		 1724static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1725 struct srp_login_rsp *lrsp,
1726 struct srp_target_port *target)
1727{
1728 struct ib_qp_attr *qp_attr = NULL;
1729 int attr_mask = 0;
1730 int ret;
1731 int i;
1732
1733 if (lrsp->opcode == SRP_LOGIN_RSP) {
1734 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1735 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1736
1737 /*
1738 * Reserve credits for task management so we don't
1739 * bounce requests back to the SCSI mid-layer.
1740 */
1741 target->scsi_host->can_queue
1742 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1743 target->scsi_host->can_queue);
4d73f95f
BVA		 1744 target->scsi_host->cmd_per_lun
1745 = min_t(int, target->scsi_host->can_queue,
1746 target->scsi_host->cmd_per_lun);
961e0be8
DD		 1747 } else {
1748 shost_printk(KERN_WARNING, target->scsi_host,
1749 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1750 ret = -ECONNRESET;
1751 goto error;
1752 }
1753
4d73f95f 1754 if (!target->rx_ring) {
961e0be8
DD		 1755 ret = srp_alloc_iu_bufs(target);
1756 if (ret)
1757 goto error;
1758 }
1759
1760 ret = -ENOMEM;
1761 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1762 if (!qp_attr)
1763 goto error;
1764
1765 qp_attr->qp_state = IB_QPS_RTR;
1766 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1767 if (ret)
1768 goto error_free;
1769
1770 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1771 if (ret)
1772 goto error_free;
1773
4d73f95f 1774 for (i = 0; i < target->queue_size; i++) {
961e0be8
DD		 1775 struct srp_iu *iu = target->rx_ring[i];
1776 ret = srp_post_recv(target, iu);
1777 if (ret)
1778 goto error_free;
1779 }
1780
1781 qp_attr->qp_state = IB_QPS_RTS;
1782 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1783 if (ret)
1784 goto error_free;
1785
c9b03c1a
BVA		 1786 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1787
961e0be8
DD		 1788 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1789 if (ret)
1790 goto error_free;
1791
1792 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1793
1794error_free:
1795 kfree(qp_attr);
1796
1797error:
1798 target->status = ret;
1799}
1800
aef9ec39
RD		 1801static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1802 struct ib_cm_event *event,
1803 struct srp_target_port *target)
1804{
7aa54bd7 1805 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1806 struct ib_class_port_info *cpi;
1807 int opcode;
1808
1809 switch (event->param.rej_rcvd.reason) {
1810 case IB_CM_REJ_PORT_CM_REDIRECT:
1811 cpi = event->param.rej_rcvd.ari;
1812 target->path.dlid = cpi->redirect_lid;
1813 target->path.pkey = cpi->redirect_pkey;
1814 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1815 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1816
1817 target->status = target->path.dlid ?
1818 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1819 break;
1820
1821 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1822 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1823 /*
1824 * Topspin/Cisco SRP gateways incorrectly send
1825 * reject reason code 25 when they mean 24
1826 * (port redirect).
1827 */
1828 memcpy(target->path.dgid.raw,
1829 event->param.rej_rcvd.ari, 16);
1830
7aa54bd7
DD		 1831 shost_printk(KERN_DEBUG, shost,
1832 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1833 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1834 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1835
1836 target->status = SRP_PORT_REDIRECT;
1837 } else {
7aa54bd7
DD		 1838 shost_printk(KERN_WARNING, shost,
1839 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1840 target->status = -ECONNRESET;
1841 }
1842 break;
1843
1844 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1845 shost_printk(KERN_WARNING, shost,
1846 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1847 target->status = -ECONNRESET;
1848 break;
1849
1850 case IB_CM_REJ_CONSUMER_DEFINED:
1851 opcode = *(u8 *) event->private_data;
1852 if (opcode == SRP_LOGIN_REJ) {
1853 struct srp_login_rej *rej = event->private_data;
1854 u32 reason = be32_to_cpu(rej->reason);
1855
1856 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1857 shost_printk(KERN_WARNING, shost,
1858 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1859 else
e7ffde01
BVA		 1860 shost_printk(KERN_WARNING, shost, PFX
1861 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
1862 target->path.sgid.raw,
1863 target->orig_dgid, reason);
aef9ec39 1864 } else
7aa54bd7
DD		 1865 shost_printk(KERN_WARNING, shost,
1866 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1867 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1868 target->status = -ECONNRESET;
1869 break;
1870
9fe4bcf4
DD		 1871 case IB_CM_REJ_STALE_CONN:
1872 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1873 target->status = SRP_STALE_CONN;
1874 break;
1875
aef9ec39 1876 default:
7aa54bd7
DD		 1877 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1878 event->param.rej_rcvd.reason);
aef9ec39
RD		 1879 target->status = -ECONNRESET;
1880 }
1881}
1882
1883static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1884{
1885 struct srp_target_port *target = cm_id->context;
aef9ec39 1886 int comp = 0;
aef9ec39
RD		 1887
1888 switch (event->event) {
1889 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1890 shost_printk(KERN_DEBUG, target->scsi_host,
1891 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1892 comp = 1;
1893 target->status = -ECONNRESET;
1894 break;
1895
1896 case IB_CM_REP_RECEIVED:
1897 comp = 1;
961e0be8 1898 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 1899 break;
1900
1901 case IB_CM_REJ_RECEIVED:
7aa54bd7 1902 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1903 comp = 1;
1904
1905 srp_cm_rej_handler(cm_id, event, target);
1906 break;
1907
b7ac4ab4 1908 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1909 shost_printk(KERN_WARNING, target->scsi_host,
1910 PFX "DREQ received - connection closed\n");
294c875a 1911 srp_change_conn_state(target, false);
b7ac4ab4 1912 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1913 shost_printk(KERN_ERR, target->scsi_host,
1914 PFX "Sending CM DREP failed\n");
c1120f89 1915 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 1916 break;
1917
1918 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1919 shost_printk(KERN_ERR, target->scsi_host,
1920 PFX "connection closed\n");
ac72d766 1921 comp = 1;
aef9ec39 1922
aef9ec39
RD		 1923 target->status = 0;
1924 break;
1925
b7ac4ab4
IR		 1926 case IB_CM_MRA_RECEIVED:
1927 case IB_CM_DREQ_ERROR:
1928 case IB_CM_DREP_RECEIVED:
1929 break;
1930
aef9ec39 1931 default:
7aa54bd7
DD		 1932 shost_printk(KERN_WARNING, target->scsi_host,
1933 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1934 break;
1935 }
1936
1937 if (comp)
1938 complete(&target->done);
1939
aef9ec39
RD		 1940 return 0;
1941}
1942
71444b97
JW		 1943/**
1944 * srp_change_queue_type - changing device queue tag type
1945 * @sdev: scsi device struct
1946 * @tag_type: requested tag type
1947 *
1948 * Returns queue tag type.
1949 */
1950static int
1951srp_change_queue_type(struct scsi_device *sdev, int tag_type)
1952{
1953 if (sdev->tagged_supported) {
1954 scsi_set_tag_type(sdev, tag_type);
1955 if (tag_type)
1956 scsi_activate_tcq(sdev, sdev->queue_depth);
1957 else
1958 scsi_deactivate_tcq(sdev, sdev->queue_depth);
1959 } else
1960 tag_type = 0;
1961
1962 return tag_type;
1963}
1964
1965/**
1966 * srp_change_queue_depth - setting device queue depth
1967 * @sdev: scsi device struct
1968 * @qdepth: requested queue depth
1969 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
1970 * (see include/scsi/scsi_host.h for definition)
1971 *
1972 * Returns queue depth.
1973 */
1974static int
1975srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
1976{
1977 struct Scsi_Host *shost = sdev->host;
1978 int max_depth;
1979 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
1980 max_depth = shost->can_queue;
1981 if (!sdev->tagged_supported)
1982 max_depth = 1;
1983 if (qdepth > max_depth)
1984 qdepth = max_depth;
1985 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
1986 } else if (reason == SCSI_QDEPTH_QFULL)
1987 scsi_track_queue_full(sdev, qdepth);
1988 else
1989 return -EOPNOTSUPP;
1990
1991 return sdev->queue_depth;
1992}
1993
d945e1df 1994static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 1995 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 1996{
a95cadb9 1997 struct srp_rport *rport = target->rport;
19081f31 1998 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 1999 struct srp_iu *iu;
2000 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 2001
3780d1f0
BVA		 2002 if (!target->connected || target->qp_in_error)
2003 return -1;
2004
f8b6e31e 2005 init_completion(&target->tsk_mgmt_done);
aef9ec39 2006
a95cadb9
BVA		 2007 /*
2008 * Lock the rport mutex to avoid that srp_create_target_ib() is
2009 * invoked while a task management function is being sent.
2010 */
2011 mutex_lock(&rport->mutex);
e9684678 2012 spin_lock_irq(&target->lock);
bb12588a 2013 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 2014 spin_unlock_irq(&target->lock);
76c75b25 2015
a95cadb9
BVA		 2016 if (!iu) {
2017 mutex_unlock(&rport->mutex);
2018
76c75b25 2019 return -1;
a95cadb9 2020 }
aef9ec39 2021
19081f31
DD		 2022 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
2023 DMA_TO_DEVICE);
aef9ec39
RD		 2024 tsk_mgmt = iu->buf;
2025 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2026
2027 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 2028 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
2029 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 2030 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 2031 tsk_mgmt->task_tag = req_tag;
aef9ec39 2032
19081f31
DD		 2033 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2034 DMA_TO_DEVICE);
76c75b25
BVA		 2035 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
2036 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 2037 mutex_unlock(&rport->mutex);
2038
76c75b25
BVA		 2039 return -1;
2040 }
a95cadb9 2041 mutex_unlock(&rport->mutex);
d945e1df 2042
f8b6e31e 2043 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 2044 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 2045 return -1;
aef9ec39 2046
d945e1df 2047 return 0;
d945e1df
RD		 2048}
2049
aef9ec39
RD		 2050static int srp_abort(struct scsi_cmnd *scmnd)
2051{
d945e1df 2052 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 2053 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
086f44f5 2054 int ret;
d945e1df 2055
7aa54bd7 2056 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 2057
b3fe628d 2058 if (!req || !srp_claim_req(target, req, NULL, scmnd))
99b6697a 2059 return SUCCESS;
086f44f5 2060 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
80d5e8a2 2061 SRP_TSK_ABORT_TASK) == 0)
086f44f5 2062 ret = SUCCESS;
ed9b2264 2063 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 2064 ret = FAST_IO_FAIL;
086f44f5
BVA		 2065 else
2066 ret = FAILED;
22032991
BVA		 2067 srp_free_req(target, req, scmnd, 0);
2068 scmnd->result = DID_ABORT << 16;
d8536670 2069 scmnd->scsi_done(scmnd);
d945e1df 2070
086f44f5 2071 return ret;
aef9ec39
RD		 2072}
2073
2074static int srp_reset_device(struct scsi_cmnd *scmnd)
2075{
d945e1df 2076 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 2077 int i;
d945e1df 2078
7aa54bd7 2079 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 2080
f8b6e31e
DD		 2081 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2082 SRP_TSK_LUN_RESET))
d945e1df 2083 return FAILED;
f8b6e31e 2084 if (target->tsk_mgmt_status)
d945e1df
RD		 2085 return FAILED;
2086
4d73f95f 2087 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 2088 struct srp_request *req = &target->req_ring[i];
b3fe628d 2089 srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
536ae14e 2090 }
d945e1df 2091
d945e1df 2092 return SUCCESS;
aef9ec39
RD		 2093}
2094
2095static int srp_reset_host(struct scsi_cmnd *scmnd)
2096{
2097 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 2098
7aa54bd7 2099 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 2100
ed9b2264 2101 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 2102}
2103
c9b03c1a
BVA		 2104static int srp_slave_configure(struct scsi_device *sdev)
2105{
2106 struct Scsi_Host *shost = sdev->host;
2107 struct srp_target_port *target = host_to_target(shost);
2108 struct request_queue *q = sdev->request_queue;
2109 unsigned long timeout;
2110
2111 if (sdev->type == TYPE_DISK) {
2112 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2113 blk_queue_rq_timeout(q, timeout);
2114 }
2115
2116 return 0;
2117}
2118
ee959b00
TJ		 2119static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2120 char *buf)
6ecb0c84 2121{
ee959b00 2122 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2123
6ecb0c84
RD		 2124 return sprintf(buf, "0x%016llx\n",
2125 (unsigned long long) be64_to_cpu(target->id_ext));
2126}
2127
ee959b00
TJ		 2128static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2129 char *buf)
6ecb0c84 2130{
ee959b00 2131 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2132
6ecb0c84
RD		 2133 return sprintf(buf, "0x%016llx\n",
2134 (unsigned long long) be64_to_cpu(target->ioc_guid));
2135}
2136
ee959b00
TJ		 2137static ssize_t show_service_id(struct device *dev,
2138 struct device_attribute *attr, char *buf)
6ecb0c84 2139{
ee959b00 2140 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2141
6ecb0c84
RD		 2142 return sprintf(buf, "0x%016llx\n",
2143 (unsigned long long) be64_to_cpu(target->service_id));
2144}
2145
ee959b00
TJ		 2146static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2147 char *buf)
6ecb0c84 2148{
ee959b00 2149 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2150
6ecb0c84
RD		 2151 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2152}
2153
848b3082
BVA		 2154static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2155 char *buf)
2156{
2157 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2158
2159 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2160}
2161
ee959b00
TJ		 2162static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2163 char *buf)
6ecb0c84 2164{
ee959b00 2165 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2166
5b095d98 2167 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 2168}
2169
ee959b00
TJ		 2170static ssize_t show_orig_dgid(struct device *dev,
2171 struct device_attribute *attr, char *buf)
3633b3d0 2172{
ee959b00 2173 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 2174
5b095d98 2175 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 2176}
2177
89de7486
BVA		 2178static ssize_t show_req_lim(struct device *dev,
2179 struct device_attribute *attr, char *buf)
2180{
2181 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2182
89de7486
BVA		 2183 return sprintf(buf, "%d\n", target->req_lim);
2184}
2185
ee959b00
TJ		 2186static ssize_t show_zero_req_lim(struct device *dev,
2187 struct device_attribute *attr, char *buf)
6bfa24fa 2188{
ee959b00 2189 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 2190
6bfa24fa
RD		 2191 return sprintf(buf, "%d\n", target->zero_req_lim);
2192}
2193
ee959b00
TJ		 2194static ssize_t show_local_ib_port(struct device *dev,
2195 struct device_attribute *attr, char *buf)
ded7f1a1 2196{
ee959b00 2197 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2198
2199 return sprintf(buf, "%d\n", target->srp_host->port);
2200}
2201
ee959b00
TJ		 2202static ssize_t show_local_ib_device(struct device *dev,
2203 struct device_attribute *attr, char *buf)
ded7f1a1 2204{
ee959b00 2205 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2206
05321937 2207 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2208}
2209
4b5e5f41
BVA		 2210static ssize_t show_comp_vector(struct device *dev,
2211 struct device_attribute *attr, char *buf)
2212{
2213 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2214
2215 return sprintf(buf, "%d\n", target->comp_vector);
2216}
2217
7bb312e4
VP		 2218static ssize_t show_tl_retry_count(struct device *dev,
2219 struct device_attribute *attr, char *buf)
2220{
2221 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2222
2223 return sprintf(buf, "%d\n", target->tl_retry_count);
2224}
2225
49248644
DD		 2226static ssize_t show_cmd_sg_entries(struct device *dev,
2227 struct device_attribute *attr, char *buf)
2228{
2229 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2230
2231 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2232}
2233
c07d424d
DD		 2234static ssize_t show_allow_ext_sg(struct device *dev,
2235 struct device_attribute *attr, char *buf)
2236{
2237 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2238
2239 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2240}
2241
ee959b00
TJ		 2242static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2243static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2244static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2245static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
848b3082 2246static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
ee959b00
TJ		 2247static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2248static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2249static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2250static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2251static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2252static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2253static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2254static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2255static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2256static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2257
2258static struct device_attribute *srp_host_attrs[] = {
2259 &dev_attr_id_ext,
2260 &dev_attr_ioc_guid,
2261 &dev_attr_service_id,
2262 &dev_attr_pkey,
848b3082 2263 &dev_attr_sgid,
ee959b00
TJ		 2264 &dev_attr_dgid,
2265 &dev_attr_orig_dgid,
89de7486 2266 &dev_attr_req_lim,
ee959b00
TJ		 2267 &dev_attr_zero_req_lim,
2268 &dev_attr_local_ib_port,
2269 &dev_attr_local_ib_device,
4b5e5f41 2270 &dev_attr_comp_vector,
7bb312e4 2271 &dev_attr_tl_retry_count,
49248644 2272 &dev_attr_cmd_sg_entries,
c07d424d 2273 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2274 NULL
2275};
2276
aef9ec39
RD		 2277static struct scsi_host_template srp_template = {
2278 .module = THIS_MODULE,
b7f008fd
RD		 2279 .name = "InfiniBand SRP initiator",
2280 .proc_name = DRV_NAME,
c9b03c1a 2281 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2282 .info = srp_target_info,
2283 .queuecommand = srp_queuecommand,
71444b97
JW		 2284 .change_queue_depth = srp_change_queue_depth,
2285 .change_queue_type = srp_change_queue_type,
aef9ec39
RD		 2286 .eh_abort_handler = srp_abort,
2287 .eh_device_reset_handler = srp_reset_device,
2288 .eh_host_reset_handler = srp_reset_host,
2742c1da 2289 .skip_settle_delay = true,
49248644 2290 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
4d73f95f 2291 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
aef9ec39 2292 .this_id = -1,
4d73f95f 2293 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
6ecb0c84
RD		 2294 .use_clustering = ENABLE_CLUSTERING,
2295 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2296};
2297
2298static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2299{
3236822b
FT		 2300 struct srp_rport_identifiers ids;
2301 struct srp_rport *rport;
2302
aef9ec39
RD		 2303 sprintf(target->target_name, "SRP.T10:%016llX",
2304 (unsigned long long) be64_to_cpu(target->id_ext));
2305
05321937 2306 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2307 return -ENODEV;
2308
3236822b
FT		 2309 memcpy(ids.port_id, &target->id_ext, 8);
2310 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2311 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2312 rport = srp_rport_add(target->scsi_host, &ids);
2313 if (IS_ERR(rport)) {
2314 scsi_remove_host(target->scsi_host);
2315 return PTR_ERR(rport);
2316 }
2317
dc1bdbd9 2318 rport->lld_data = target;
9dd69a60 2319 target->rport = rport;
dc1bdbd9 2320
b3589fd4 2321 spin_lock(&host->target_lock);
aef9ec39 2322 list_add_tail(&target->list, &host->target_list);
b3589fd4 2323 spin_unlock(&host->target_lock);
aef9ec39
RD		 2324
2325 target->state = SRP_TARGET_LIVE;
2326
aef9ec39 2327 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2328 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 2329
2330 return 0;
2331}
2332
ee959b00 2333static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2334{
2335 struct srp_host *host =
ee959b00 2336 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2337
2338 complete(&host->released);
2339}
2340
2341static struct class srp_class = {
2342 .name = "infiniband_srp",
ee959b00 2343 .dev_release = srp_release_dev
aef9ec39
RD		 2344};
2345
96fc248a
BVA		 2346/**
2347 * srp_conn_unique() - check whether the connection to a target is unique
af24663b
BVA		 2348 * @host: SRP host.
2349 * @target: SRP target port.
96fc248a
BVA		 2350 */
2351static bool srp_conn_unique(struct srp_host *host,
2352 struct srp_target_port *target)
2353{
2354 struct srp_target_port *t;
2355 bool ret = false;
2356
2357 if (target->state == SRP_TARGET_REMOVED)
2358 goto out;
2359
2360 ret = true;
2361
2362 spin_lock(&host->target_lock);
2363 list_for_each_entry(t, &host->target_list, list) {
2364 if (t != target &&
2365 target->id_ext == t->id_ext &&
2366 target->ioc_guid == t->ioc_guid &&
2367 target->initiator_ext == t->initiator_ext) {
2368 ret = false;
2369 break;
2370 }
2371 }
2372 spin_unlock(&host->target_lock);
2373
2374out:
2375 return ret;
2376}
2377
aef9ec39
RD		 2378/*
2379 * Target ports are added by writing
2380 *
2381 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2382 * pkey=<P_Key>,service_id=<service ID>
2383 *
2384 * to the add_target sysfs attribute.
2385 */
2386enum {
2387 SRP_OPT_ERR = 0,
2388 SRP_OPT_ID_EXT = 1 << 0,
2389 SRP_OPT_IOC_GUID = 1 << 1,
2390 SRP_OPT_DGID = 1 << 2,
2391 SRP_OPT_PKEY = 1 << 3,
2392 SRP_OPT_SERVICE_ID = 1 << 4,
2393 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2394 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2395 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2396 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2397 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2398 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2399 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2400 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2401 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
4d73f95f 2402 SRP_OPT_QUEUE_SIZE = 1 << 14,
aef9ec39
RD		 2403 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2404 SRP_OPT_IOC_GUID |
2405 SRP_OPT_DGID |
2406 SRP_OPT_PKEY |
2407 SRP_OPT_SERVICE_ID),
2408};
2409
a447c093 2410static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2411 { SRP_OPT_ID_EXT, "id_ext=%s" },
2412 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2413 { SRP_OPT_DGID, "dgid=%s" },
2414 { SRP_OPT_PKEY, "pkey=%x" },
2415 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2416 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2417 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2418 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2419 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2420 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2421 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2422 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2423 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2424 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
4d73f95f 2425 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
52fb2b50 2426 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2427};
2428
2429static int srp_parse_options(const char *buf, struct srp_target_port *target)
2430{
2431 char *options, *sep_opt;
2432 char *p;
2433 char dgid[3];
2434 substring_t args[MAX_OPT_ARGS];
2435 int opt_mask = 0;
2436 int token;
2437 int ret = -EINVAL;
2438 int i;
2439
2440 options = kstrdup(buf, GFP_KERNEL);
2441 if (!options)
2442 return -ENOMEM;
2443
2444 sep_opt = options;
2445 while ((p = strsep(&sep_opt, ",")) != NULL) {
2446 if (!*p)
2447 continue;
2448
2449 token = match_token(p, srp_opt_tokens, args);
2450 opt_mask |= token;
2451
2452 switch (token) {
2453 case SRP_OPT_ID_EXT:
2454 p = match_strdup(args);
a20f3a6d
IR		 2455 if (!p) {
2456 ret = -ENOMEM;
2457 goto out;
2458 }
aef9ec39
RD		 2459 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2460 kfree(p);
2461 break;
2462
2463 case SRP_OPT_IOC_GUID:
2464 p = match_strdup(args);
a20f3a6d
IR		 2465 if (!p) {
2466 ret = -ENOMEM;
2467 goto out;
2468 }
aef9ec39
RD		 2469 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2470 kfree(p);
2471 break;
2472
2473 case SRP_OPT_DGID:
2474 p = match_strdup(args);
a20f3a6d
IR		 2475 if (!p) {
2476 ret = -ENOMEM;
2477 goto out;
2478 }
aef9ec39 2479 if (strlen(p) != 32) {
e0bda7d8 2480 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2481 kfree(p);
aef9ec39
RD		 2482 goto out;
2483 }
2484
2485 for (i = 0; i < 16; ++i) {
2486 strlcpy(dgid, p + i * 2, 3);
2487 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2488 }
bf17c1c7 2489 kfree(p);
3633b3d0 2490 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2491 break;
2492
2493 case SRP_OPT_PKEY:
2494 if (match_hex(args, &token)) {
e0bda7d8 2495 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2496 goto out;
2497 }
2498 target->path.pkey = cpu_to_be16(token);
2499 break;
2500
2501 case SRP_OPT_SERVICE_ID:
2502 p = match_strdup(args);
a20f3a6d
IR		 2503 if (!p) {
2504 ret = -ENOMEM;
2505 goto out;
2506 }
aef9ec39 2507 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2508 target->path.service_id = target->service_id;
aef9ec39
RD		 2509 kfree(p);
2510 break;
2511
2512 case SRP_OPT_MAX_SECT:
2513 if (match_int(args, &token)) {
e0bda7d8 2514 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2515 goto out;
2516 }
2517 target->scsi_host->max_sectors = token;
2518 break;
2519
4d73f95f
BVA		 2520 case SRP_OPT_QUEUE_SIZE:
2521 if (match_int(args, &token) || token < 1) {
2522 pr_warn("bad queue_size parameter '%s'\n", p);
2523 goto out;
2524 }
2525 target->scsi_host->can_queue = token;
2526 target->queue_size = token + SRP_RSP_SQ_SIZE +
2527 SRP_TSK_MGMT_SQ_SIZE;
2528 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2529 target->scsi_host->cmd_per_lun = token;
2530 break;
2531
52fb2b50 2532 case SRP_OPT_MAX_CMD_PER_LUN:
4d73f95f 2533 if (match_int(args, &token) || token < 1) {
e0bda7d8
BVA		 2534 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2535 p);
52fb2b50
VP		 2536 goto out;
2537 }
4d73f95f 2538 target->scsi_host->cmd_per_lun = token;
52fb2b50
VP		 2539 break;
2540
0c0450db
R		 2541 case SRP_OPT_IO_CLASS:
2542 if (match_hex(args, &token)) {
e0bda7d8 2543 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2544 goto out;
2545 }
2546 if (token != SRP_REV10_IB_IO_CLASS &&
2547 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2548 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2549 token, SRP_REV10_IB_IO_CLASS,
2550 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2551 goto out;
2552 }
2553 target->io_class = token;
2554 break;
2555
01cb9bcb
IR		 2556 case SRP_OPT_INITIATOR_EXT:
2557 p = match_strdup(args);
a20f3a6d
IR		 2558 if (!p) {
2559 ret = -ENOMEM;
2560 goto out;
2561 }
01cb9bcb
IR		 2562 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2563 kfree(p);
2564 break;
2565
49248644
DD		 2566 case SRP_OPT_CMD_SG_ENTRIES:
2567 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2568 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2569 p);
49248644
DD		 2570 goto out;
2571 }
2572 target->cmd_sg_cnt = token;
2573 break;
2574
c07d424d
DD		 2575 case SRP_OPT_ALLOW_EXT_SG:
2576 if (match_int(args, &token)) {
e0bda7d8 2577 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2578 goto out;
2579 }
2580 target->allow_ext_sg = !!token;
2581 break;
2582
2583 case SRP_OPT_SG_TABLESIZE:
2584 if (match_int(args, &token) || token < 1 ||
2585 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2586 pr_warn("bad max sg_tablesize parameter '%s'\n",
2587 p);
c07d424d
DD		 2588 goto out;
2589 }
2590 target->sg_tablesize = token;
2591 break;
2592
4b5e5f41
BVA		 2593 case SRP_OPT_COMP_VECTOR:
2594 if (match_int(args, &token) || token < 0) {
2595 pr_warn("bad comp_vector parameter '%s'\n", p);
2596 goto out;
2597 }
2598 target->comp_vector = token;
2599 break;
2600
7bb312e4
VP		 2601 case SRP_OPT_TL_RETRY_COUNT:
2602 if (match_int(args, &token) || token < 2 || token > 7) {
2603 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2604 p);
2605 goto out;
2606 }
2607 target->tl_retry_count = token;
2608 break;
2609
aef9ec39 2610 default:
e0bda7d8
BVA		 2611 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2612 p);
aef9ec39
RD		 2613 goto out;
2614 }
2615 }
2616
2617 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2618 ret = 0;
2619 else
2620 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2621 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2622 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2623 pr_warn("target creation request is missing parameter '%s'\n",
2624 srp_opt_tokens[i].pattern);
aef9ec39 2625
4d73f95f
BVA		 2626 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2627 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2628 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2629 target->scsi_host->cmd_per_lun,
2630 target->scsi_host->can_queue);
2631
aef9ec39
RD		 2632out:
2633 kfree(options);
2634 return ret;
2635}
2636
ee959b00
TJ		 2637static ssize_t srp_create_target(struct device *dev,
2638 struct device_attribute *attr,
aef9ec39
RD		 2639 const char *buf, size_t count)
2640{
2641 struct srp_host *host =
ee959b00 2642 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2643 struct Scsi_Host *target_host;
2644 struct srp_target_port *target;
c07d424d 2645 struct ib_device *ibdev = host->srp_dev->dev;
b81d00bd 2646 int ret;
aef9ec39
RD		 2647
2648 target_host = scsi_host_alloc(&srp_template,
2649 sizeof (struct srp_target_port));
2650 if (!target_host)
2651 return -ENOMEM;
2652
49248644 2653 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2654 target_host->max_channel = 0;
2655 target_host->max_id = 1;
3c8edf0e
AR		 2656 target_host->max_lun = SRP_MAX_LUN;
2657 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2658
aef9ec39 2659 target = host_to_target(target_host);
aef9ec39 2660
49248644
DD		 2661 target->io_class = SRP_REV16A_IB_IO_CLASS;
2662 target->scsi_host = target_host;
2663 target->srp_host = host;
2664 target->lkey = host->srp_dev->mr->lkey;
2665 target->rkey = host->srp_dev->mr->rkey;
2666 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2667 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2668 target->allow_ext_sg = allow_ext_sg;
7bb312e4 2669 target->tl_retry_count = 7;
4d73f95f 2670 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
aef9ec39 2671
2d7091bc
BVA		 2672 mutex_lock(&host->add_target_mutex);
2673
aef9ec39
RD		 2674 ret = srp_parse_options(buf, target);
2675 if (ret)
2676 goto err;
2677
4d73f95f
BVA		 2678 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2679
96fc248a
BVA		 2680 if (!srp_conn_unique(target->srp_host, target)) {
2681 shost_printk(KERN_INFO, target->scsi_host,
2682 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2683 be64_to_cpu(target->id_ext),
2684 be64_to_cpu(target->ioc_guid),
2685 be64_to_cpu(target->initiator_ext));
2686 ret = -EEXIST;
2687 goto err;
2688 }
2689
c07d424d
DD		 2690 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2691 target->cmd_sg_cnt < target->sg_tablesize) {
e0bda7d8 2692 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 2693 target->sg_tablesize = target->cmd_sg_cnt;
2694 }
2695
2696 target_host->sg_tablesize = target->sg_tablesize;
2697 target->indirect_size = target->sg_tablesize *
2698 sizeof (struct srp_direct_buf);
49248644
DD		 2699 target->max_iu_len = sizeof (struct srp_cmd) +
2700 sizeof (struct srp_indirect_buf) +
2701 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2702
c1120f89 2703 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 2704 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 2705 spin_lock_init(&target->lock);
2706 INIT_LIST_HEAD(&target->free_tx);
b81d00bd
BVA		 2707 ret = srp_alloc_req_data(target);
2708 if (ret)
2709 goto err_free_mem;
8f26c9ff 2710
2088ca66
SG		 2711 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2712 if (ret)
2713 goto err_free_mem;
aef9ec39 2714
aef9ec39
RD		 2715 ret = srp_create_target_ib(target);
2716 if (ret)
8f26c9ff 2717 goto err_free_mem;
aef9ec39 2718
9fe4bcf4
DD		 2719 ret = srp_new_cm_id(target);
2720 if (ret)
8f26c9ff 2721 goto err_free_ib;
aef9ec39
RD		 2722
2723 ret = srp_connect_target(target);
2724 if (ret) {
7aa54bd7
DD		 2725 shost_printk(KERN_ERR, target->scsi_host,
2726 PFX "Connection failed\n");
aef9ec39
RD		 2727 goto err_cm_id;
2728 }
2729
2730 ret = srp_add_target(host, target);
2731 if (ret)
2732 goto err_disconnect;
2733
e7ffde01
BVA		 2734 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2735 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
2736 be64_to_cpu(target->id_ext),
2737 be64_to_cpu(target->ioc_guid),
2738 be16_to_cpu(target->path.pkey),
2739 be64_to_cpu(target->service_id),
2740 target->path.sgid.raw, target->path.dgid.raw);
2741
2d7091bc
BVA		 2742 ret = count;
2743
2744out:
2745 mutex_unlock(&host->add_target_mutex);
2746 return ret;
aef9ec39
RD		 2747
2748err_disconnect:
2749 srp_disconnect_target(target);
2750
2751err_cm_id:
2752 ib_destroy_cm_id(target->cm_id);
2753
8f26c9ff 2754err_free_ib:
aef9ec39
RD		 2755 srp_free_target_ib(target);
2756
8f26c9ff
DD		 2757err_free_mem:
2758 srp_free_req_data(target);
2759
aef9ec39
RD		 2760err:
2761 scsi_host_put(target_host);
2d7091bc 2762 goto out;
aef9ec39
RD		 2763}
2764
ee959b00 2765static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2766
ee959b00
TJ		 2767static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2768 char *buf)
aef9ec39 2769{
ee959b00 2770 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2771
05321937 2772 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2773}
2774
ee959b00 2775static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2776
ee959b00
TJ		 2777static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2778 char *buf)
aef9ec39 2779{
ee959b00 2780 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2781
2782 return sprintf(buf, "%d\n", host->port);
2783}
2784
ee959b00 2785static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2786
f5358a17 2787static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2788{
2789 struct srp_host *host;
2790
2791 host = kzalloc(sizeof *host, GFP_KERNEL);
2792 if (!host)
2793 return NULL;
2794
2795 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2796 spin_lock_init(&host->target_lock);
aef9ec39 2797 init_completion(&host->released);
2d7091bc 2798 mutex_init(&host->add_target_mutex);
05321937 2799 host->srp_dev = device;
aef9ec39
RD		 2800 host->port = port;
2801
ee959b00
TJ		 2802 host->dev.class = &srp_class;
2803 host->dev.parent = device->dev->dma_device;
d927e38c 2804 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2805
ee959b00 2806 if (device_register(&host->dev))
f5358a17 2807 goto free_host;
ee959b00 2808 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2809 goto err_class;
ee959b00 2810 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2811 goto err_class;
ee959b00 2812 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2813 goto err_class;
2814
2815 return host;
2816
2817err_class:
ee959b00 2818 device_unregister(&host->dev);
aef9ec39 2819
f5358a17 2820free_host:
aef9ec39
RD		 2821 kfree(host);
2822
2823 return NULL;
2824}
2825
2826static void srp_add_one(struct ib_device *device)
2827{
f5358a17
RD		 2828 struct srp_device *srp_dev;
2829 struct ib_device_attr *dev_attr;
2830 struct ib_fmr_pool_param fmr_param;
aef9ec39 2831 struct srp_host *host;
be8b9814 2832 int max_pages_per_fmr, fmr_page_shift, s, e, p;
aef9ec39 2833
f5358a17
RD		 2834 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2835 if (!dev_attr)
cf311cd4 2836 return;
aef9ec39 2837
f5358a17 2838 if (ib_query_device(device, dev_attr)) {
e0bda7d8 2839 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 2840 goto free_attr;
2841 }
2842
2843 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2844 if (!srp_dev)
2845 goto free_attr;
2846
2847 /*
2848 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 2849 * minimum of 4096 bytes. We're unlikely to build large sglists
2850 * out of smaller entries.
f5358a17 2851 */
8f26c9ff
DD		 2852 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2853 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2854 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2855 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
f5358a17
RD		 2856
2857 INIT_LIST_HEAD(&srp_dev->dev_list);
2858
2859 srp_dev->dev = device;
2860 srp_dev->pd = ib_alloc_pd(device);
2861 if (IS_ERR(srp_dev->pd))
2862 goto free_dev;
2863
2864 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2865 IB_ACCESS_LOCAL_WRITE |
2866 IB_ACCESS_REMOTE_READ |
2867 IB_ACCESS_REMOTE_WRITE);
2868 if (IS_ERR(srp_dev->mr))
2869 goto err_pd;
2870
be8b9814
DD		 2871 for (max_pages_per_fmr = SRP_FMR_SIZE;
2872 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2873 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2874 memset(&fmr_param, 0, sizeof fmr_param);
2875 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2876 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2877 fmr_param.cache = 1;
2878 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2879 fmr_param.page_shift = fmr_page_shift;
2880 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2881 IB_ACCESS_REMOTE_WRITE |
2882 IB_ACCESS_REMOTE_READ);
2883
2884 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2885 if (!IS_ERR(srp_dev->fmr_pool))
2886 break;
2887 }
2888
f5358a17
RD		 2889 if (IS_ERR(srp_dev->fmr_pool))
2890 srp_dev->fmr_pool = NULL;
aef9ec39 2891
07ebafba 2892 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2893 s = 0;
2894 e = 0;
2895 } else {
2896 s = 1;
2897 e = device->phys_port_cnt;
2898 }
2899
2900 for (p = s; p <= e; ++p) {
f5358a17 2901 host = srp_add_port(srp_dev, p);
aef9ec39 2902 if (host)
f5358a17 2903 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2904 }
2905
f5358a17
RD		 2906 ib_set_client_data(device, &srp_client, srp_dev);
2907
2908 goto free_attr;
2909
2910err_pd:
2911 ib_dealloc_pd(srp_dev->pd);
2912
2913free_dev:
2914 kfree(srp_dev);
2915
2916free_attr:
2917 kfree(dev_attr);
aef9ec39
RD		 2918}
2919
2920static void srp_remove_one(struct ib_device *device)
2921{
f5358a17 2922 struct srp_device *srp_dev;
aef9ec39 2923 struct srp_host *host, *tmp_host;
ef6c49d8 2924 struct srp_target_port *target;
aef9ec39 2925
f5358a17 2926 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 2927 if (!srp_dev)
2928 return;
aef9ec39 2929
f5358a17 2930 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2931 device_unregister(&host->dev);
aef9ec39
RD		 2932 /*
2933 * Wait for the sysfs entry to go away, so that no new
2934 * target ports can be created.
2935 */
2936 wait_for_completion(&host->released);
2937
2938 /*
ef6c49d8 2939 * Remove all target ports.
aef9ec39 2940 */
b3589fd4 2941 spin_lock(&host->target_lock);
ef6c49d8
BVA		 2942 list_for_each_entry(target, &host->target_list, list)
2943 srp_queue_remove_work(target);
b3589fd4 2944 spin_unlock(&host->target_lock);
aef9ec39
RD		 2945
2946 /*
ef6c49d8 2947 * Wait for target port removal tasks.
aef9ec39 2948 */
ef6c49d8 2949 flush_workqueue(system_long_wq);
aef9ec39 2950
aef9ec39
RD		 2951 kfree(host);
2952 }
2953
f5358a17
RD		 2954 if (srp_dev->fmr_pool)
2955 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2956 ib_dereg_mr(srp_dev->mr);
2957 ib_dealloc_pd(srp_dev->pd);
2958
2959 kfree(srp_dev);
aef9ec39
RD		 2960}
2961
3236822b 2962static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 2963 .has_rport_state = true,
2964 .reset_timer_if_blocked = true,
a95cadb9 2965 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 2966 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
2967 .dev_loss_tmo = &srp_dev_loss_tmo,
2968 .reconnect = srp_rport_reconnect,
dc1bdbd9 2969 .rport_delete = srp_rport_delete,
ed9b2264 2970 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 2971};
2972
aef9ec39
RD		 2973static int __init srp_init_module(void)
2974{
2975 int ret;
2976
dcb4cb85 2977 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 2978
49248644 2979 if (srp_sg_tablesize) {
e0bda7d8 2980 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 2981 if (!cmd_sg_entries)
2982 cmd_sg_entries = srp_sg_tablesize;
2983 }
2984
2985 if (!cmd_sg_entries)
2986 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2987
2988 if (cmd_sg_entries > 255) {
e0bda7d8 2989 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 2990 cmd_sg_entries = 255;
1e89a194
DD		 2991 }
2992
c07d424d
DD		 2993 if (!indirect_sg_entries)
2994 indirect_sg_entries = cmd_sg_entries;
2995 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 2996 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2997 cmd_sg_entries);
c07d424d
DD		 2998 indirect_sg_entries = cmd_sg_entries;
2999 }
3000
3236822b
FT		 3001 ib_srp_transport_template =
3002 srp_attach_transport(&ib_srp_transport_functions);
3003 if (!ib_srp_transport_template)
3004 return -ENOMEM;
3005
aef9ec39
RD		 3006 ret = class_register(&srp_class);
3007 if (ret) {
e0bda7d8 3008 pr_err("couldn't register class infiniband_srp\n");
3236822b 3009 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 3010 return ret;
3011 }
3012
c1a0b23b
MT		 3013 ib_sa_register_client(&srp_sa_client);
3014
aef9ec39
RD		 3015 ret = ib_register_client(&srp_client);
3016 if (ret) {
e0bda7d8 3017 pr_err("couldn't register IB client\n");
3236822b 3018 srp_release_transport(ib_srp_transport_template);
c1a0b23b 3019 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 3020 class_unregister(&srp_class);
3021 return ret;
3022 }
3023
3024 return 0;
3025}
3026
3027static void __exit srp_cleanup_module(void)
3028{
3029 ib_unregister_client(&srp_client);
c1a0b23b 3030 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 3031 class_unregister(&srp_class);
3236822b 3032 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 3033}
3034
3035module_init(srp_init_module);
3036module_exit(srp_cleanup_module);
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