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scsi_transport_srp: Fix fast_io_fail_tmo=dev_loss_tmo=off behavior
[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
d236cd0e 33#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
e0bda7d8 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;
5cfb1782 69static bool prefer_fr;
b1b8854d 70static bool register_always;
49248644 71static int topspin_workarounds = 1;
74b0a15b 72
49248644
DD		 73module_param(srp_sg_tablesize, uint, 0444);
74MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
74b0a15b 75
49248644
DD		 76module_param(cmd_sg_entries, uint, 0444);
77MODULE_PARM_DESC(cmd_sg_entries,
78 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
aef9ec39 79
c07d424d
DD		 80module_param(indirect_sg_entries, uint, 0444);
81MODULE_PARM_DESC(indirect_sg_entries,
82 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
83
84module_param(allow_ext_sg, bool, 0444);
85MODULE_PARM_DESC(allow_ext_sg,
86 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
87
aef9ec39
RD		 88module_param(topspin_workarounds, int, 0444);
89MODULE_PARM_DESC(topspin_workarounds,
90 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
91
5cfb1782
BVA		 92module_param(prefer_fr, bool, 0444);
93MODULE_PARM_DESC(prefer_fr,
94"Whether to use fast registration if both FMR and fast registration are supported");
95
b1b8854d
BVA		 96module_param(register_always, bool, 0444);
97MODULE_PARM_DESC(register_always,
98 "Use memory registration even for contiguous memory regions");
99
ed9b2264
BVA		 100static struct kernel_param_ops srp_tmo_ops;
101
a95cadb9
BVA		 102static int srp_reconnect_delay = 10;
103module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
104 S_IRUGO | S_IWUSR);
105MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
106
ed9b2264
BVA		 107static int srp_fast_io_fail_tmo = 15;
108module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
109 S_IRUGO | S_IWUSR);
110MODULE_PARM_DESC(fast_io_fail_tmo,
111 "Number of seconds between the observation of a transport"
112 " layer error and failing all I/O. \"off\" means that this"
113 " functionality is disabled.");
114
a95cadb9 115static int srp_dev_loss_tmo = 600;
ed9b2264
BVA		 116module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
117 S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(dev_loss_tmo,
119 "Maximum number of seconds that the SRP transport should"
120 " insulate transport layer errors. After this time has been"
121 " exceeded the SCSI host is removed. Should be"
122 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
123 " if fast_io_fail_tmo has not been set. \"off\" means that"
124 " this functionality is disabled.");
125
aef9ec39
RD		 126static void srp_add_one(struct ib_device *device);
127static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 128static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
129static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 130static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
131
3236822b
FT		 132static struct scsi_transport_template *ib_srp_transport_template;
133
aef9ec39
RD		 134static struct ib_client srp_client = {
135 .name = "srp",
136 .add = srp_add_one,
137 .remove = srp_remove_one
138};
139
c1a0b23b
MT		 140static struct ib_sa_client srp_sa_client;
141
ed9b2264
BVA		 142static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
143{
144 int tmo = *(int *)kp->arg;
145
146 if (tmo >= 0)
147 return sprintf(buffer, "%d", tmo);
148 else
149 return sprintf(buffer, "off");
150}
151
152static int srp_tmo_set(const char *val, const struct kernel_param *kp)
153{
154 int tmo, res;
155
156 if (strncmp(val, "off", 3) != 0) {
157 res = kstrtoint(val, 0, &tmo);
158 if (res)
159 goto out;
160 } else {
161 tmo = -1;
162 }
a95cadb9
BVA		 163 if (kp->arg == &srp_reconnect_delay)
164 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
165 srp_dev_loss_tmo);
166 else if (kp->arg == &srp_fast_io_fail_tmo)
167 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
ed9b2264 168 else
a95cadb9
BVA		 169 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
170 tmo);
ed9b2264
BVA		 171 if (res)
172 goto out;
173 *(int *)kp->arg = tmo;
174
175out:
176 return res;
177}
178
179static struct kernel_param_ops srp_tmo_ops = {
180 .get = srp_tmo_get,
181 .set = srp_tmo_set,
182};
183
aef9ec39
RD		 184static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
185{
186 return (struct srp_target_port *) host->hostdata;
187}
188
189static const char *srp_target_info(struct Scsi_Host *host)
190{
191 return host_to_target(host)->target_name;
192}
193
5d7cbfd6
RD		 194static int srp_target_is_topspin(struct srp_target_port *target)
195{
196 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 197 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 198
199 return topspin_workarounds &&
3d1ff48d
RK		 200 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
201 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 202}
203
aef9ec39
RD		 204static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
205 gfp_t gfp_mask,
206 enum dma_data_direction direction)
207{
208 struct srp_iu *iu;
209
210 iu = kmalloc(sizeof *iu, gfp_mask);
211 if (!iu)
212 goto out;
213
214 iu->buf = kzalloc(size, gfp_mask);
215 if (!iu->buf)
216 goto out_free_iu;
217
05321937
GKH		 218 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
219 direction);
220 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 221 goto out_free_buf;
222
223 iu->size = size;
224 iu->direction = direction;
225
226 return iu;
227
228out_free_buf:
229 kfree(iu->buf);
230out_free_iu:
231 kfree(iu);
232out:
233 return NULL;
234}
235
236static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
237{
238 if (!iu)
239 return;
240
05321937
GKH		 241 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
242 iu->direction);
aef9ec39
RD		 243 kfree(iu->buf);
244 kfree(iu);
245}
246
247static void srp_qp_event(struct ib_event *event, void *context)
248{
e0bda7d8 249 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 250}
251
252static int srp_init_qp(struct srp_target_port *target,
253 struct ib_qp *qp)
254{
255 struct ib_qp_attr *attr;
256 int ret;
257
258 attr = kmalloc(sizeof *attr, GFP_KERNEL);
259 if (!attr)
260 return -ENOMEM;
261
969a60f9
RD		 262 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
263 target->srp_host->port,
264 be16_to_cpu(target->path.pkey),
265 &attr->pkey_index);
aef9ec39
RD		 266 if (ret)
267 goto out;
268
269 attr->qp_state = IB_QPS_INIT;
270 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
271 IB_ACCESS_REMOTE_WRITE);
272 attr->port_num = target->srp_host->port;
273
274 ret = ib_modify_qp(qp, attr,
275 IB_QP_STATE |
276 IB_QP_PKEY_INDEX |
277 IB_QP_ACCESS_FLAGS |
278 IB_QP_PORT);
279
280out:
281 kfree(attr);
282 return ret;
283}
284
9fe4bcf4
DD		 285static int srp_new_cm_id(struct srp_target_port *target)
286{
287 struct ib_cm_id *new_cm_id;
288
05321937 289 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 290 srp_cm_handler, target);
291 if (IS_ERR(new_cm_id))
292 return PTR_ERR(new_cm_id);
293
294 if (target->cm_id)
295 ib_destroy_cm_id(target->cm_id);
296 target->cm_id = new_cm_id;
297
298 return 0;
299}
300
d1b4289e
BVA		 301static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target)
302{
303 struct srp_device *dev = target->srp_host->srp_dev;
304 struct ib_fmr_pool_param fmr_param;
305
306 memset(&fmr_param, 0, sizeof(fmr_param));
307 fmr_param.pool_size = target->scsi_host->can_queue;
308 fmr_param.dirty_watermark = fmr_param.pool_size / 4;
309 fmr_param.cache = 1;
52ede08f
BVA		 310 fmr_param.max_pages_per_fmr = dev->max_pages_per_mr;
311 fmr_param.page_shift = ilog2(dev->mr_page_size);
d1b4289e
BVA		 312 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
313 IB_ACCESS_REMOTE_WRITE |
314 IB_ACCESS_REMOTE_READ);
315
316 return ib_create_fmr_pool(dev->pd, &fmr_param);
317}
318
5cfb1782
BVA		 319/**
320 * srp_destroy_fr_pool() - free the resources owned by a pool
321 * @pool: Fast registration pool to be destroyed.
322 */
323static void srp_destroy_fr_pool(struct srp_fr_pool *pool)
324{
325 int i;
326 struct srp_fr_desc *d;
327
328 if (!pool)
329 return;
330
331 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
332 if (d->frpl)
333 ib_free_fast_reg_page_list(d->frpl);
334 if (d->mr)
335 ib_dereg_mr(d->mr);
336 }
337 kfree(pool);
338}
339
340/**
341 * srp_create_fr_pool() - allocate and initialize a pool for fast registration
342 * @device: IB device to allocate fast registration descriptors for.
343 * @pd: Protection domain associated with the FR descriptors.
344 * @pool_size: Number of descriptors to allocate.
345 * @max_page_list_len: Maximum fast registration work request page list length.
346 */
347static struct srp_fr_pool *srp_create_fr_pool(struct ib_device *device,
348 struct ib_pd *pd, int pool_size,
349 int max_page_list_len)
350{
351 struct srp_fr_pool *pool;
352 struct srp_fr_desc *d;
353 struct ib_mr *mr;
354 struct ib_fast_reg_page_list *frpl;
355 int i, ret = -EINVAL;
356
357 if (pool_size <= 0)
358 goto err;
359 ret = -ENOMEM;
360 pool = kzalloc(sizeof(struct srp_fr_pool) +
361 pool_size * sizeof(struct srp_fr_desc), GFP_KERNEL);
362 if (!pool)
363 goto err;
364 pool->size = pool_size;
365 pool->max_page_list_len = max_page_list_len;
366 spin_lock_init(&pool->lock);
367 INIT_LIST_HEAD(&pool->free_list);
368
369 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
370 mr = ib_alloc_fast_reg_mr(pd, max_page_list_len);
371 if (IS_ERR(mr)) {
372 ret = PTR_ERR(mr);
373 goto destroy_pool;
374 }
375 d->mr = mr;
376 frpl = ib_alloc_fast_reg_page_list(device, max_page_list_len);
377 if (IS_ERR(frpl)) {
378 ret = PTR_ERR(frpl);
379 goto destroy_pool;
380 }
381 d->frpl = frpl;
382 list_add_tail(&d->entry, &pool->free_list);
383 }
384
385out:
386 return pool;
387
388destroy_pool:
389 srp_destroy_fr_pool(pool);
390
391err:
392 pool = ERR_PTR(ret);
393 goto out;
394}
395
396/**
397 * srp_fr_pool_get() - obtain a descriptor suitable for fast registration
398 * @pool: Pool to obtain descriptor from.
399 */
400static struct srp_fr_desc *srp_fr_pool_get(struct srp_fr_pool *pool)
401{
402 struct srp_fr_desc *d = NULL;
403 unsigned long flags;
404
405 spin_lock_irqsave(&pool->lock, flags);
406 if (!list_empty(&pool->free_list)) {
407 d = list_first_entry(&pool->free_list, typeof(*d), entry);
408 list_del(&d->entry);
409 }
410 spin_unlock_irqrestore(&pool->lock, flags);
411
412 return d;
413}
414
415/**
416 * srp_fr_pool_put() - put an FR descriptor back in the free list
417 * @pool: Pool the descriptor was allocated from.
418 * @desc: Pointer to an array of fast registration descriptor pointers.
419 * @n: Number of descriptors to put back.
420 *
421 * Note: The caller must already have queued an invalidation request for
422 * desc->mr->rkey before calling this function.
423 */
424static void srp_fr_pool_put(struct srp_fr_pool *pool, struct srp_fr_desc **desc,
425 int n)
426{
427 unsigned long flags;
428 int i;
429
430 spin_lock_irqsave(&pool->lock, flags);
431 for (i = 0; i < n; i++)
432 list_add(&desc[i]->entry, &pool->free_list);
433 spin_unlock_irqrestore(&pool->lock, flags);
434}
435
436static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target)
437{
438 struct srp_device *dev = target->srp_host->srp_dev;
439
440 return srp_create_fr_pool(dev->dev, dev->pd,
441 target->scsi_host->can_queue,
442 dev->max_pages_per_mr);
443}
444
aef9ec39
RD		 445static int srp_create_target_ib(struct srp_target_port *target)
446{
62154b2e 447 struct srp_device *dev = target->srp_host->srp_dev;
aef9ec39 448 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 449 struct ib_cq *recv_cq, *send_cq;
450 struct ib_qp *qp;
d1b4289e 451 struct ib_fmr_pool *fmr_pool = NULL;
5cfb1782
BVA		 452 struct srp_fr_pool *fr_pool = NULL;
453 const int m = 1 + dev->use_fast_reg;
aef9ec39
RD		 454 int ret;
455
456 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
457 if (!init_attr)
458 return -ENOMEM;
459
62154b2e 460 recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, target,
4d73f95f 461 target->queue_size, target->comp_vector);
73aa89ed
IR		 462 if (IS_ERR(recv_cq)) {
463 ret = PTR_ERR(recv_cq);
da9d2f07 464 goto err;
aef9ec39
RD		 465 }
466
62154b2e 467 send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, target,
5cfb1782 468 m * target->queue_size, target->comp_vector);
73aa89ed
IR		 469 if (IS_ERR(send_cq)) {
470 ret = PTR_ERR(send_cq);
da9d2f07 471 goto err_recv_cq;
9c03dc9f
BVA		 472 }
473
73aa89ed 474 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 475
476 init_attr->event_handler = srp_qp_event;
5cfb1782 477 init_attr->cap.max_send_wr = m * target->queue_size;
4d73f95f 478 init_attr->cap.max_recv_wr = target->queue_size;
aef9ec39
RD		 479 init_attr->cap.max_recv_sge = 1;
480 init_attr->cap.max_send_sge = 1;
5cfb1782 481 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
aef9ec39 482 init_attr->qp_type = IB_QPT_RC;
73aa89ed
IR		 483 init_attr->send_cq = send_cq;
484 init_attr->recv_cq = recv_cq;
aef9ec39 485
62154b2e 486 qp = ib_create_qp(dev->pd, init_attr);
73aa89ed
IR		 487 if (IS_ERR(qp)) {
488 ret = PTR_ERR(qp);
da9d2f07 489 goto err_send_cq;
aef9ec39
RD		 490 }
491
73aa89ed 492 ret = srp_init_qp(target, qp);
da9d2f07
RD		 493 if (ret)
494 goto err_qp;
aef9ec39 495
5cfb1782
BVA		 496 if (dev->use_fast_reg && dev->has_fr) {
497 fr_pool = srp_alloc_fr_pool(target);
498 if (IS_ERR(fr_pool)) {
499 ret = PTR_ERR(fr_pool);
500 shost_printk(KERN_WARNING, target->scsi_host, PFX
501 "FR pool allocation failed (%d)\n", ret);
502 goto err_qp;
503 }
504 if (target->fr_pool)
505 srp_destroy_fr_pool(target->fr_pool);
506 target->fr_pool = fr_pool;
507 } else if (!dev->use_fast_reg && dev->has_fmr) {
d1b4289e
BVA		 508 fmr_pool = srp_alloc_fmr_pool(target);
509 if (IS_ERR(fmr_pool)) {
510 ret = PTR_ERR(fmr_pool);
511 shost_printk(KERN_WARNING, target->scsi_host, PFX
512 "FMR pool allocation failed (%d)\n", ret);
513 goto err_qp;
514 }
515 if (target->fmr_pool)
516 ib_destroy_fmr_pool(target->fmr_pool);
517 target->fmr_pool = fmr_pool;
518 }
519
73aa89ed
IR		 520 if (target->qp)
521 ib_destroy_qp(target->qp);
522 if (target->recv_cq)
523 ib_destroy_cq(target->recv_cq);
524 if (target->send_cq)
525 ib_destroy_cq(target->send_cq);
526
527 target->qp = qp;
528 target->recv_cq = recv_cq;
529 target->send_cq = send_cq;
530
da9d2f07
RD		 531 kfree(init_attr);
532 return 0;
533
534err_qp:
73aa89ed 535 ib_destroy_qp(qp);
da9d2f07
RD		 536
537err_send_cq:
73aa89ed 538 ib_destroy_cq(send_cq);
da9d2f07
RD		 539
540err_recv_cq:
73aa89ed 541 ib_destroy_cq(recv_cq);
da9d2f07
RD		 542
543err:
aef9ec39
RD		 544 kfree(init_attr);
545 return ret;
546}
547
4d73f95f
BVA		 548/*
549 * Note: this function may be called without srp_alloc_iu_bufs() having been
550 * invoked. Hence the target->[rt]x_ring checks.
551 */
aef9ec39
RD		 552static void srp_free_target_ib(struct srp_target_port *target)
553{
5cfb1782 554 struct srp_device *dev = target->srp_host->srp_dev;
aef9ec39
RD		 555 int i;
556
5cfb1782
BVA		 557 if (dev->use_fast_reg) {
558 if (target->fr_pool)
559 srp_destroy_fr_pool(target->fr_pool);
560 } else {
561 if (target->fmr_pool)
562 ib_destroy_fmr_pool(target->fmr_pool);
563 }
aef9ec39 564 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 565 ib_destroy_cq(target->send_cq);
566 ib_destroy_cq(target->recv_cq);
aef9ec39 567
73aa89ed
IR		 568 target->qp = NULL;
569 target->send_cq = target->recv_cq = NULL;
570
4d73f95f
BVA		 571 if (target->rx_ring) {
572 for (i = 0; i < target->queue_size; ++i)
573 srp_free_iu(target->srp_host, target->rx_ring[i]);
574 kfree(target->rx_ring);
575 target->rx_ring = NULL;
576 }
577 if (target->tx_ring) {
578 for (i = 0; i < target->queue_size; ++i)
579 srp_free_iu(target->srp_host, target->tx_ring[i]);
580 kfree(target->tx_ring);
581 target->tx_ring = NULL;
582 }
aef9ec39
RD		 583}
584
585static void srp_path_rec_completion(int status,
586 struct ib_sa_path_rec *pathrec,
587 void *target_ptr)
588{
589 struct srp_target_port *target = target_ptr;
590
591 target->status = status;
592 if (status)
7aa54bd7
DD		 593 shost_printk(KERN_ERR, target->scsi_host,
594 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 595 else
596 target->path = *pathrec;
597 complete(&target->done);
598}
599
600static int srp_lookup_path(struct srp_target_port *target)
601{
a702adce
BVA		 602 int ret;
603
aef9ec39
RD		 604 target->path.numb_path = 1;
605
606 init_completion(&target->done);
607
c1a0b23b 608 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 609 target->srp_host->srp_dev->dev,
aef9ec39
RD		 610 target->srp_host->port,
611 &target->path,
247e020e 612 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 613 IB_SA_PATH_REC_DGID |
614 IB_SA_PATH_REC_SGID |
615 IB_SA_PATH_REC_NUMB_PATH |
616 IB_SA_PATH_REC_PKEY,
617 SRP_PATH_REC_TIMEOUT_MS,
618 GFP_KERNEL,
619 srp_path_rec_completion,
620 target, &target->path_query);
621 if (target->path_query_id < 0)
622 return target->path_query_id;
623
a702adce
BVA		 624 ret = wait_for_completion_interruptible(&target->done);
625 if (ret < 0)
626 return ret;
aef9ec39
RD		 627
628 if (target->status < 0)
7aa54bd7
DD		 629 shost_printk(KERN_WARNING, target->scsi_host,
630 PFX "Path record query failed\n");
aef9ec39
RD		 631
632 return target->status;
633}
634
635static int srp_send_req(struct srp_target_port *target)
636{
637 struct {
638 struct ib_cm_req_param param;
639 struct srp_login_req priv;
640 } *req = NULL;
641 int status;
642
643 req = kzalloc(sizeof *req, GFP_KERNEL);
644 if (!req)
645 return -ENOMEM;
646
647 req->param.primary_path = &target->path;
648 req->param.alternate_path = NULL;
649 req->param.service_id = target->service_id;
650 req->param.qp_num = target->qp->qp_num;
651 req->param.qp_type = target->qp->qp_type;
652 req->param.private_data = &req->priv;
653 req->param.private_data_len = sizeof req->priv;
654 req->param.flow_control = 1;
655
656 get_random_bytes(&req->param.starting_psn, 4);
657 req->param.starting_psn &= 0xffffff;
658
659 /*
660 * Pick some arbitrary defaults here; we could make these
661 * module parameters if anyone cared about setting them.
662 */
663 req->param.responder_resources = 4;
664 req->param.remote_cm_response_timeout = 20;
665 req->param.local_cm_response_timeout = 20;
7bb312e4 666 req->param.retry_count = target->tl_retry_count;
aef9ec39
RD		 667 req->param.rnr_retry_count = 7;
668 req->param.max_cm_retries = 15;
669
670 req->priv.opcode = SRP_LOGIN_REQ;
671 req->priv.tag = 0;
49248644 672 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 673 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
674 SRP_BUF_FORMAT_INDIRECT);
0c0450db 675 /*
3cd96564 676 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 677 * port identifier format is 8 bytes of ID extension followed
678 * by 8 bytes of GUID. Older drafts put the two halves in the
679 * opposite order, so that the GUID comes first.
680 *
681 * Targets conforming to these obsolete drafts can be
682 * recognized by the I/O Class they report.
683 */
684 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
685 memcpy(req->priv.initiator_port_id,
01cb9bcb 686 &target->path.sgid.global.interface_id, 8);
0c0450db 687 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 688 &target->initiator_ext, 8);
0c0450db
R		 689 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
690 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
691 } else {
692 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 693 &target->initiator_ext, 8);
694 memcpy(req->priv.initiator_port_id + 8,
695 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 696 memcpy(req->priv.target_port_id, &target->id_ext, 8);
697 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
698 }
699
aef9ec39
RD		 700 /*
701 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 702 * zero out the first 8 bytes of our initiator port ID and set
703 * the second 8 bytes to the local node GUID.
aef9ec39 704 */
5d7cbfd6 705 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 706 shost_printk(KERN_DEBUG, target->scsi_host,
707 PFX "Topspin/Cisco initiator port ID workaround "
708 "activated for target GUID %016llx\n",
709 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 710 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 711 memcpy(req->priv.initiator_port_id + 8,
05321937 712 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 713 }
aef9ec39
RD		 714
715 status = ib_send_cm_req(target->cm_id, &req->param);
716
717 kfree(req);
718
719 return status;
720}
721
ef6c49d8
BVA		 722static bool srp_queue_remove_work(struct srp_target_port *target)
723{
724 bool changed = false;
725
726 spin_lock_irq(&target->lock);
727 if (target->state != SRP_TARGET_REMOVED) {
728 target->state = SRP_TARGET_REMOVED;
729 changed = true;
730 }
731 spin_unlock_irq(&target->lock);
732
733 if (changed)
734 queue_work(system_long_wq, &target->remove_work);
735
736 return changed;
737}
738
294c875a
BVA		 739static bool srp_change_conn_state(struct srp_target_port *target,
740 bool connected)
741{
742 bool changed = false;
743
744 spin_lock_irq(&target->lock);
745 if (target->connected != connected) {
746 target->connected = connected;
747 changed = true;
748 }
749 spin_unlock_irq(&target->lock);
750
751 return changed;
752}
753
aef9ec39
RD		 754static void srp_disconnect_target(struct srp_target_port *target)
755{
294c875a
BVA		 756 if (srp_change_conn_state(target, false)) {
757 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 758
294c875a
BVA		 759 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
760 shost_printk(KERN_DEBUG, target->scsi_host,
761 PFX "Sending CM DREQ failed\n");
294c875a 762 }
e6581056 763 }
aef9ec39
RD		 764}
765
8f26c9ff
DD		 766static void srp_free_req_data(struct srp_target_port *target)
767{
5cfb1782
BVA		 768 struct srp_device *dev = target->srp_host->srp_dev;
769 struct ib_device *ibdev = dev->dev;
8f26c9ff
DD		 770 struct srp_request *req;
771 int i;
772
4d73f95f
BVA		 773 if (!target->req_ring)
774 return;
775
776 for (i = 0; i < target->req_ring_size; ++i) {
777 req = &target->req_ring[i];
5cfb1782
BVA		 778 if (dev->use_fast_reg)
779 kfree(req->fr_list);
780 else
781 kfree(req->fmr_list);
8f26c9ff 782 kfree(req->map_page);
c07d424d
DD		 783 if (req->indirect_dma_addr) {
784 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
785 target->indirect_size,
786 DMA_TO_DEVICE);
787 }
788 kfree(req->indirect_desc);
8f26c9ff 789 }
4d73f95f
BVA		 790
791 kfree(target->req_ring);
792 target->req_ring = NULL;
8f26c9ff
DD		 793}
794
b81d00bd
BVA		 795static int srp_alloc_req_data(struct srp_target_port *target)
796{
797 struct srp_device *srp_dev = target->srp_host->srp_dev;
798 struct ib_device *ibdev = srp_dev->dev;
799 struct srp_request *req;
5cfb1782 800 void *mr_list;
b81d00bd
BVA		 801 dma_addr_t dma_addr;
802 int i, ret = -ENOMEM;
803
804 INIT_LIST_HEAD(&target->free_reqs);
805
4d73f95f
BVA		 806 target->req_ring = kzalloc(target->req_ring_size *
807 sizeof(*target->req_ring), GFP_KERNEL);
808 if (!target->req_ring)
809 goto out;
810
811 for (i = 0; i < target->req_ring_size; ++i) {
b81d00bd 812 req = &target->req_ring[i];
5cfb1782
BVA		 813 mr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
814 GFP_KERNEL);
815 if (!mr_list)
816 goto out;
817 if (srp_dev->use_fast_reg)
818 req->fr_list = mr_list;
819 else
820 req->fmr_list = mr_list;
52ede08f 821 req->map_page = kmalloc(srp_dev->max_pages_per_mr *
d1b4289e 822 sizeof(void *), GFP_KERNEL);
5cfb1782
BVA		 823 if (!req->map_page)
824 goto out;
b81d00bd 825 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
5cfb1782 826 if (!req->indirect_desc)
b81d00bd
BVA		 827 goto out;
828
829 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
830 target->indirect_size,
831 DMA_TO_DEVICE);
832 if (ib_dma_mapping_error(ibdev, dma_addr))
833 goto out;
834
835 req->indirect_dma_addr = dma_addr;
836 req->index = i;
837 list_add_tail(&req->list, &target->free_reqs);
838 }
839 ret = 0;
840
841out:
842 return ret;
843}
844
683b159a
BVA		 845/**
846 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
847 * @shost: SCSI host whose attributes to remove from sysfs.
848 *
849 * Note: Any attributes defined in the host template and that did not exist
850 * before invocation of this function will be ignored.
851 */
852static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
853{
854 struct device_attribute **attr;
855
856 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
857 device_remove_file(&shost->shost_dev, *attr);
858}
859
ee12d6a8
BVA		 860static void srp_remove_target(struct srp_target_port *target)
861{
ef6c49d8
BVA		 862 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
863
ee12d6a8 864 srp_del_scsi_host_attr(target->scsi_host);
9dd69a60 865 srp_rport_get(target->rport);
ee12d6a8
BVA		 866 srp_remove_host(target->scsi_host);
867 scsi_remove_host(target->scsi_host);
93079162 868 srp_stop_rport_timers(target->rport);
ef6c49d8 869 srp_disconnect_target(target);
ee12d6a8
BVA		 870 ib_destroy_cm_id(target->cm_id);
871 srp_free_target_ib(target);
c1120f89 872 cancel_work_sync(&target->tl_err_work);
9dd69a60 873 srp_rport_put(target->rport);
ee12d6a8 874 srp_free_req_data(target);
65d7dd2f
VP		 875
876 spin_lock(&target->srp_host->target_lock);
877 list_del(&target->list);
878 spin_unlock(&target->srp_host->target_lock);
879
ee12d6a8
BVA		 880 scsi_host_put(target->scsi_host);
881}
882
c4028958 883static void srp_remove_work(struct work_struct *work)
aef9ec39 884{
c4028958 885 struct srp_target_port *target =
ef6c49d8 886 container_of(work, struct srp_target_port, remove_work);
aef9ec39 887
ef6c49d8 888 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 889
96fc248a 890 srp_remove_target(target);
aef9ec39
RD		 891}
892
dc1bdbd9
BVA		 893static void srp_rport_delete(struct srp_rport *rport)
894{
895 struct srp_target_port *target = rport->lld_data;
896
897 srp_queue_remove_work(target);
898}
899
aef9ec39
RD		 900static int srp_connect_target(struct srp_target_port *target)
901{
9fe4bcf4 902 int retries = 3;
aef9ec39
RD		 903 int ret;
904
294c875a
BVA		 905 WARN_ON_ONCE(target->connected);
906
948d1e88
BVA		 907 target->qp_in_error = false;
908
aef9ec39
RD		 909 ret = srp_lookup_path(target);
910 if (ret)
911 return ret;
912
913 while (1) {
914 init_completion(&target->done);
915 ret = srp_send_req(target);
916 if (ret)
917 return ret;
a702adce
BVA		 918 ret = wait_for_completion_interruptible(&target->done);
919 if (ret < 0)
920 return ret;
aef9ec39
RD		 921
922 /*
923 * The CM event handling code will set status to
924 * SRP_PORT_REDIRECT if we get a port redirect REJ
925 * back, or SRP_DLID_REDIRECT if we get a lid/qp
926 * redirect REJ back.
927 */
928 switch (target->status) {
929 case 0:
294c875a 930 srp_change_conn_state(target, true);
aef9ec39
RD		 931 return 0;
932
933 case SRP_PORT_REDIRECT:
934 ret = srp_lookup_path(target);
935 if (ret)
936 return ret;
937 break;
938
939 case SRP_DLID_REDIRECT:
940 break;
941
9fe4bcf4
DD		 942 case SRP_STALE_CONN:
943 /* Our current CM id was stale, and is now in timewait.
944 * Try to reconnect with a new one.
945 */
946 if (!retries-- || srp_new_cm_id(target)) {
947 shost_printk(KERN_ERR, target->scsi_host, PFX
948 "giving up on stale connection\n");
949 target->status = -ECONNRESET;
950 return target->status;
951 }
952
953 shost_printk(KERN_ERR, target->scsi_host, PFX
954 "retrying stale connection\n");
955 break;
956
aef9ec39
RD		 957 default:
958 return target->status;
959 }
960 }
961}
962
5cfb1782
BVA		 963static int srp_inv_rkey(struct srp_target_port *target, u32 rkey)
964{
965 struct ib_send_wr *bad_wr;
966 struct ib_send_wr wr = {
967 .opcode = IB_WR_LOCAL_INV,
968 .wr_id = LOCAL_INV_WR_ID_MASK,
969 .next = NULL,
970 .num_sge = 0,
971 .send_flags = 0,
972 .ex.invalidate_rkey = rkey,
973 };
974
975 return ib_post_send(target->qp, &wr, &bad_wr);
976}
977
d945e1df
RD		 978static void srp_unmap_data(struct scsi_cmnd *scmnd,
979 struct srp_target_port *target,
980 struct srp_request *req)
981{
5cfb1782
BVA		 982 struct srp_device *dev = target->srp_host->srp_dev;
983 struct ib_device *ibdev = dev->dev;
984 int i, res;
8f26c9ff 985
bb350d1d 986 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 987 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
988 scmnd->sc_data_direction != DMA_FROM_DEVICE))
989 return;
990
5cfb1782
BVA		 991 if (dev->use_fast_reg) {
992 struct srp_fr_desc **pfr;
993
994 for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) {
995 res = srp_inv_rkey(target, (*pfr)->mr->rkey);
996 if (res < 0) {
997 shost_printk(KERN_ERR, target->scsi_host, PFX
998 "Queueing INV WR for rkey %#x failed (%d)\n",
999 (*pfr)->mr->rkey, res);
1000 queue_work(system_long_wq,
1001 &target->tl_err_work);
1002 }
1003 }
1004 if (req->nmdesc)
1005 srp_fr_pool_put(target->fr_pool, req->fr_list,
1006 req->nmdesc);
1007 } else {
1008 struct ib_pool_fmr **pfmr;
1009
1010 for (i = req->nmdesc, pfmr = req->fmr_list; i > 0; i--, pfmr++)
1011 ib_fmr_pool_unmap(*pfmr);
1012 }
f5358a17 1013
8f26c9ff
DD		 1014 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
1015 scmnd->sc_data_direction);
d945e1df
RD		 1016}
1017
22032991
BVA		 1018/**
1019 * srp_claim_req - Take ownership of the scmnd associated with a request.
1020 * @target: SRP target port.
1021 * @req: SRP request.
b3fe628d 1022 * @sdev: If not NULL, only take ownership for this SCSI device.
22032991
BVA		 1023 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
1024 * ownership of @req->scmnd if it equals @scmnd.
1025 *
1026 * Return value:
1027 * Either NULL or a pointer to the SCSI command the caller became owner of.
1028 */
1029static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
1030 struct srp_request *req,
b3fe628d 1031 struct scsi_device *sdev,
22032991
BVA		 1032 struct scsi_cmnd *scmnd)
1033{
1034 unsigned long flags;
1035
1036 spin_lock_irqsave(&target->lock, flags);
b3fe628d
BVA		 1037 if (req->scmnd &&
1038 (!sdev || req->scmnd->device == sdev) &&
1039 (!scmnd || req->scmnd == scmnd)) {
22032991
BVA		 1040 scmnd = req->scmnd;
1041 req->scmnd = NULL;
22032991
BVA		 1042 } else {
1043 scmnd = NULL;
1044 }
1045 spin_unlock_irqrestore(&target->lock, flags);
1046
1047 return scmnd;
1048}
1049
1050/**
1051 * srp_free_req() - Unmap data and add request to the free request list.
af24663b
BVA		 1052 * @target: SRP target port.
1053 * @req: Request to be freed.
1054 * @scmnd: SCSI command associated with @req.
1055 * @req_lim_delta: Amount to be added to @target->req_lim.
22032991
BVA		 1056 */
1057static void srp_free_req(struct srp_target_port *target,
1058 struct srp_request *req, struct scsi_cmnd *scmnd,
1059 s32 req_lim_delta)
526b4caa 1060{
94a9174c
BVA		 1061 unsigned long flags;
1062
22032991
BVA		 1063 srp_unmap_data(scmnd, target, req);
1064
e9684678 1065 spin_lock_irqsave(&target->lock, flags);
94a9174c 1066 target->req_lim += req_lim_delta;
536ae14e 1067 list_add_tail(&req->list, &target->free_reqs);
e9684678 1068 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 1069}
1070
ed9b2264 1071static void srp_finish_req(struct srp_target_port *target,
b3fe628d
BVA		 1072 struct srp_request *req, struct scsi_device *sdev,
1073 int result)
526b4caa 1074{
b3fe628d 1075 struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
22032991
BVA		 1076
1077 if (scmnd) {
9b796d06 1078 srp_free_req(target, req, scmnd, 0);
ed9b2264 1079 scmnd->result = result;
22032991 1080 scmnd->scsi_done(scmnd);
22032991 1081 }
526b4caa
IR		 1082}
1083
ed9b2264 1084static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 1085{
ed9b2264 1086 struct srp_target_port *target = rport->lld_data;
b3fe628d
BVA		 1087 struct Scsi_Host *shost = target->scsi_host;
1088 struct scsi_device *sdev;
ed9b2264
BVA		 1089 int i;
1090
b3fe628d
BVA		 1091 /*
1092 * Invoking srp_terminate_io() while srp_queuecommand() is running
1093 * is not safe. Hence the warning statement below.
1094 */
1095 shost_for_each_device(sdev, shost)
1096 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
1097
4d73f95f 1098 for (i = 0; i < target->req_ring_size; ++i) {
ed9b2264 1099 struct srp_request *req = &target->req_ring[i];
b3fe628d 1100 srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
ed9b2264
BVA		 1101 }
1102}
aef9ec39 1103
ed9b2264
BVA		 1104/*
1105 * It is up to the caller to ensure that srp_rport_reconnect() calls are
1106 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
1107 * srp_reset_device() or srp_reset_host() calls will occur while this function
1108 * is in progress. One way to realize that is not to call this function
1109 * directly but to call srp_reconnect_rport() instead since that last function
1110 * serializes calls of this function via rport->mutex and also blocks
1111 * srp_queuecommand() calls before invoking this function.
1112 */
1113static int srp_rport_reconnect(struct srp_rport *rport)
1114{
1115 struct srp_target_port *target = rport->lld_data;
1116 int i, ret;
09be70a2 1117
aef9ec39
RD		 1118 srp_disconnect_target(target);
1119 /*
c7c4e7ff
BVA		 1120 * Now get a new local CM ID so that we avoid confusing the target in
1121 * case things are really fouled up. Doing so also ensures that all CM
1122 * callbacks will have finished before a new QP is allocated.
aef9ec39 1123 */
9fe4bcf4 1124 ret = srp_new_cm_id(target);
aef9ec39 1125
4d73f95f 1126 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 1127 struct srp_request *req = &target->req_ring[i];
b3fe628d 1128 srp_finish_req(target, req, NULL, DID_RESET << 16);
536ae14e 1129 }
aef9ec39 1130
5cfb1782
BVA		 1131 /*
1132 * Whether or not creating a new CM ID succeeded, create a new
1133 * QP. This guarantees that all callback functions for the old QP have
1134 * finished before any send requests are posted on the new QP.
1135 */
1136 ret += srp_create_target_ib(target);
1137
536ae14e 1138 INIT_LIST_HEAD(&target->free_tx);
4d73f95f 1139 for (i = 0; i < target->queue_size; ++i)
536ae14e 1140 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 1141
c7c4e7ff
BVA		 1142 if (ret == 0)
1143 ret = srp_connect_target(target);
09be70a2 1144
ed9b2264
BVA		 1145 if (ret == 0)
1146 shost_printk(KERN_INFO, target->scsi_host,
1147 PFX "reconnect succeeded\n");
aef9ec39
RD		 1148
1149 return ret;
1150}
1151
8f26c9ff
DD		 1152static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
1153 unsigned int dma_len, u32 rkey)
f5358a17 1154{
8f26c9ff 1155 struct srp_direct_buf *desc = state->desc;
f5358a17 1156
8f26c9ff
DD		 1157 desc->va = cpu_to_be64(dma_addr);
1158 desc->key = cpu_to_be32(rkey);
1159 desc->len = cpu_to_be32(dma_len);
f5358a17 1160
8f26c9ff
DD		 1161 state->total_len += dma_len;
1162 state->desc++;
1163 state->ndesc++;
1164}
559ce8f1 1165
8f26c9ff
DD		 1166static int srp_map_finish_fmr(struct srp_map_state *state,
1167 struct srp_target_port *target)
1168{
8f26c9ff
DD		 1169 struct ib_pool_fmr *fmr;
1170 u64 io_addr = 0;
85507bcc 1171
d1b4289e 1172 fmr = ib_fmr_pool_map_phys(target->fmr_pool, state->pages,
8f26c9ff
DD		 1173 state->npages, io_addr);
1174 if (IS_ERR(fmr))
1175 return PTR_ERR(fmr);
f5358a17 1176
8f26c9ff 1177 *state->next_fmr++ = fmr;
52ede08f 1178 state->nmdesc++;
f5358a17 1179
52ede08f 1180 srp_map_desc(state, 0, state->dma_len, fmr->fmr->rkey);
539dde6f 1181
8f26c9ff
DD		 1182 return 0;
1183}
1184
5cfb1782
BVA		 1185static int srp_map_finish_fr(struct srp_map_state *state,
1186 struct srp_target_port *target)
1187{
1188 struct srp_device *dev = target->srp_host->srp_dev;
1189 struct ib_send_wr *bad_wr;
1190 struct ib_send_wr wr;
1191 struct srp_fr_desc *desc;
1192 u32 rkey;
1193
1194 desc = srp_fr_pool_get(target->fr_pool);
1195 if (!desc)
1196 return -ENOMEM;
1197
1198 rkey = ib_inc_rkey(desc->mr->rkey);
1199 ib_update_fast_reg_key(desc->mr, rkey);
1200
1201 memcpy(desc->frpl->page_list, state->pages,
1202 sizeof(state->pages[0]) * state->npages);
1203
1204 memset(&wr, 0, sizeof(wr));
1205 wr.opcode = IB_WR_FAST_REG_MR;
1206 wr.wr_id = FAST_REG_WR_ID_MASK;
1207 wr.wr.fast_reg.iova_start = state->base_dma_addr;
1208 wr.wr.fast_reg.page_list = desc->frpl;
1209 wr.wr.fast_reg.page_list_len = state->npages;
1210 wr.wr.fast_reg.page_shift = ilog2(dev->mr_page_size);
1211 wr.wr.fast_reg.length = state->dma_len;
1212 wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
1213 IB_ACCESS_REMOTE_READ |
1214 IB_ACCESS_REMOTE_WRITE);
1215 wr.wr.fast_reg.rkey = desc->mr->lkey;
1216
1217 *state->next_fr++ = desc;
1218 state->nmdesc++;
1219
1220 srp_map_desc(state, state->base_dma_addr, state->dma_len,
1221 desc->mr->rkey);
1222
1223 return ib_post_send(target->qp, &wr, &bad_wr);
1224}
1225
539dde6f
BVA		 1226static int srp_finish_mapping(struct srp_map_state *state,
1227 struct srp_target_port *target)
1228{
1229 int ret = 0;
1230
1231 if (state->npages == 0)
1232 return 0;
1233
b1b8854d 1234 if (state->npages == 1 && !register_always)
52ede08f 1235 srp_map_desc(state, state->base_dma_addr, state->dma_len,
539dde6f
BVA		 1236 target->rkey);
1237 else
5cfb1782
BVA		 1238 ret = target->srp_host->srp_dev->use_fast_reg ?
1239 srp_map_finish_fr(state, target) :
1240 srp_map_finish_fmr(state, target);
539dde6f
BVA		 1241
1242 if (ret == 0) {
1243 state->npages = 0;
52ede08f 1244 state->dma_len = 0;
539dde6f
BVA		 1245 }
1246
1247 return ret;
1248}
1249
8f26c9ff
DD		 1250static void srp_map_update_start(struct srp_map_state *state,
1251 struct scatterlist *sg, int sg_index,
1252 dma_addr_t dma_addr)
1253{
1254 state->unmapped_sg = sg;
1255 state->unmapped_index = sg_index;
1256 state->unmapped_addr = dma_addr;
1257}
85507bcc 1258
8f26c9ff
DD		 1259static int srp_map_sg_entry(struct srp_map_state *state,
1260 struct srp_target_port *target,
1261 struct scatterlist *sg, int sg_index,
5cfb1782 1262 bool use_mr)
8f26c9ff
DD		 1263{
1264 struct srp_device *dev = target->srp_host->srp_dev;
1265 struct ib_device *ibdev = dev->dev;
1266 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
1267 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
1268 unsigned int len;
1269 int ret;
1270
1271 if (!dma_len)
1272 return 0;
1273
5cfb1782
BVA		 1274 if (!use_mr) {
1275 /*
1276 * Once we're in direct map mode for a request, we don't
1277 * go back to FMR or FR mode, so no need to update anything
8f26c9ff
DD		 1278 * other than the descriptor.
1279 */
1280 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1281 return 0;
85507bcc 1282 }
f5358a17 1283
5cfb1782
BVA		 1284 /*
1285 * Since not all RDMA HW drivers support non-zero page offsets for
1286 * FMR, if we start at an offset into a page, don't merge into the
1287 * current FMR mapping. Finish it out, and use the kernel's MR for
1288 * this sg entry.
8f26c9ff 1289 */
5cfb1782
BVA		 1290 if ((!dev->use_fast_reg && dma_addr & ~dev->mr_page_mask) ||
1291 dma_len > dev->mr_max_size) {
539dde6f 1292 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1293 if (ret)
1294 return ret;
1295
1296 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1297 srp_map_update_start(state, NULL, 0, 0);
1298 return 0;
f5358a17
RD		 1299 }
1300
5cfb1782
BVA		 1301 /*
1302 * If this is the first sg that will be mapped via FMR or via FR, save
1303 * our position. We need to know the first unmapped entry, its index,
1304 * and the first unmapped address within that entry to be able to
1305 * restart mapping after an error.
8f26c9ff
DD		 1306 */
1307 if (!state->unmapped_sg)
1308 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 1309
8f26c9ff 1310 while (dma_len) {
5cfb1782
BVA		 1311 unsigned offset = dma_addr & ~dev->mr_page_mask;
1312 if (state->npages == dev->max_pages_per_mr || offset != 0) {
539dde6f 1313 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1314 if (ret)
1315 return ret;
f5358a17 1316
8f26c9ff
DD		 1317 srp_map_update_start(state, sg, sg_index, dma_addr);
1318 }
1319
5cfb1782 1320 len = min_t(unsigned int, dma_len, dev->mr_page_size - offset);
f5358a17 1321
8f26c9ff
DD		 1322 if (!state->npages)
1323 state->base_dma_addr = dma_addr;
5cfb1782 1324 state->pages[state->npages++] = dma_addr & dev->mr_page_mask;
52ede08f 1325 state->dma_len += len;
8f26c9ff
DD		 1326 dma_addr += len;
1327 dma_len -= len;
1328 }
1329
5cfb1782
BVA		 1330 /*
1331 * If the last entry of the MR wasn't a full page, then we need to
8f26c9ff
DD		 1332 * close it out and start a new one -- we can only merge at page
1333 * boundries.
1334 */
1335 ret = 0;
52ede08f 1336 if (len != dev->mr_page_size) {
539dde6f 1337 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1338 if (!ret)
1339 srp_map_update_start(state, NULL, 0, 0);
1340 }
f5358a17
RD		 1341 return ret;
1342}
1343
5cfb1782
BVA		 1344static int srp_map_sg(struct srp_map_state *state,
1345 struct srp_target_port *target, struct srp_request *req,
1346 struct scatterlist *scat, int count)
76bc1e1d
BVA		 1347{
1348 struct srp_device *dev = target->srp_host->srp_dev;
1349 struct ib_device *ibdev = dev->dev;
1350 struct scatterlist *sg;
5cfb1782
BVA		 1351 int i;
1352 bool use_mr;
76bc1e1d
BVA		 1353
1354 state->desc = req->indirect_desc;
1355 state->pages = req->map_page;
5cfb1782
BVA		 1356 if (dev->use_fast_reg) {
1357 state->next_fr = req->fr_list;
1358 use_mr = !!target->fr_pool;
1359 } else {
1360 state->next_fmr = req->fmr_list;
1361 use_mr = !!target->fmr_pool;
1362 }
76bc1e1d
BVA		 1363
1364 for_each_sg(scat, sg, count, i) {
5cfb1782
BVA		 1365 if (srp_map_sg_entry(state, target, sg, i, use_mr)) {
1366 /*
1367 * Memory registration failed, so backtrack to the
1368 * first unmapped entry and continue on without using
1369 * memory registration.
76bc1e1d
BVA		 1370 */
1371 dma_addr_t dma_addr;
1372 unsigned int dma_len;
1373
1374backtrack:
1375 sg = state->unmapped_sg;
1376 i = state->unmapped_index;
1377
1378 dma_addr = ib_sg_dma_address(ibdev, sg);
1379 dma_len = ib_sg_dma_len(ibdev, sg);
1380 dma_len -= (state->unmapped_addr - dma_addr);
1381 dma_addr = state->unmapped_addr;
5cfb1782 1382 use_mr = false;
76bc1e1d
BVA		 1383 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1384 }
1385 }
1386
5cfb1782 1387 if (use_mr && srp_finish_mapping(state, target))
76bc1e1d
BVA		 1388 goto backtrack;
1389
52ede08f 1390 req->nmdesc = state->nmdesc;
5cfb1782
BVA		 1391
1392 return 0;
76bc1e1d
BVA		 1393}
1394
aef9ec39
RD		 1395static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1396 struct srp_request *req)
1397{
76bc1e1d 1398 struct scatterlist *scat;
aef9ec39 1399 struct srp_cmd *cmd = req->cmd->buf;
76bc1e1d 1400 int len, nents, count;
85507bcc
RC		 1401 struct srp_device *dev;
1402 struct ib_device *ibdev;
8f26c9ff
DD		 1403 struct srp_map_state state;
1404 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 1405 u32 table_len;
1406 u8 fmt;
aef9ec39 1407
bb350d1d 1408 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 1409 return sizeof (struct srp_cmd);
1410
1411 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1412 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 1413 shost_printk(KERN_WARNING, target->scsi_host,
1414 PFX "Unhandled data direction %d\n",
1415 scmnd->sc_data_direction);
aef9ec39
RD		 1416 return -EINVAL;
1417 }
1418
bb350d1d
FT		 1419 nents = scsi_sg_count(scmnd);
1420 scat = scsi_sglist(scmnd);
aef9ec39 1421
05321937 1422 dev = target->srp_host->srp_dev;
85507bcc
RC		 1423 ibdev = dev->dev;
1424
1425 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 1426 if (unlikely(count == 0))
1427 return -EIO;
f5358a17
RD		 1428
1429 fmt = SRP_DATA_DESC_DIRECT;
1430 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1431
b1b8854d 1432 if (count == 1 && !register_always) {
f5358a17
RD		 1433 /*
1434 * The midlayer only generated a single gather/scatter
1435 * entry, or DMA mapping coalesced everything to a
1436 * single entry. So a direct descriptor along with
1437 * the DMA MR suffices.
1438 */
cf368713 1439 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1440
85507bcc 1441 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1442 buf->key = cpu_to_be32(target->rkey);
85507bcc 1443 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff 1444
52ede08f 1445 req->nmdesc = 0;
8f26c9ff
DD		 1446 goto map_complete;
1447 }
1448
5cfb1782
BVA		 1449 /*
1450 * We have more than one scatter/gather entry, so build our indirect
1451 * descriptor table, trying to merge as many entries as we can.
8f26c9ff
DD		 1452 */
1453 indirect_hdr = (void *) cmd->add_data;
1454
c07d424d
DD		 1455 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1456 target->indirect_size, DMA_TO_DEVICE);
1457
8f26c9ff 1458 memset(&state, 0, sizeof(state));
5cfb1782 1459 srp_map_sg(&state, target, req, scat, count);
cf368713 1460
c07d424d
DD		 1461 /* We've mapped the request, now pull as much of the indirect
1462 * descriptor table as we can into the command buffer. If this
1463 * target is not using an external indirect table, we are
1464 * guaranteed to fit into the command, as the SCSI layer won't
1465 * give us more S/G entries than we allow.
8f26c9ff 1466 */
8f26c9ff 1467 if (state.ndesc == 1) {
5cfb1782
BVA		 1468 /*
1469 * Memory registration collapsed the sg-list into one entry,
8f26c9ff
DD		 1470 * so use a direct descriptor.
1471 */
1472 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1473
c07d424d 1474 *buf = req->indirect_desc[0];
8f26c9ff 1475 goto map_complete;
aef9ec39
RD		 1476 }
1477
c07d424d
DD		 1478 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1479 !target->allow_ext_sg)) {
1480 shost_printk(KERN_ERR, target->scsi_host,
1481 "Could not fit S/G list into SRP_CMD\n");
1482 return -EIO;
1483 }
1484
1485 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1486 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1487
1488 fmt = SRP_DATA_DESC_INDIRECT;
1489 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1490 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1491
c07d424d
DD		 1492 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1493 count * sizeof (struct srp_direct_buf));
8f26c9ff 1494
c07d424d 1495 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1496 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1497 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1498 indirect_hdr->len = cpu_to_be32(state.total_len);
1499
1500 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1501 cmd->data_out_desc_cnt = count;
8f26c9ff 1502 else
c07d424d
DD		 1503 cmd->data_in_desc_cnt = count;
1504
1505 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1506 DMA_TO_DEVICE);
8f26c9ff
DD		 1507
1508map_complete:
aef9ec39
RD		 1509 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1510 cmd->buf_fmt = fmt << 4;
1511 else
1512 cmd->buf_fmt = fmt;
1513
aef9ec39
RD		 1514 return len;
1515}
1516
76c75b25
BVA		 1517/*
1518 * Return an IU and possible credit to the free pool
1519 */
1520static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1521 enum srp_iu_type iu_type)
1522{
1523 unsigned long flags;
1524
e9684678 1525 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1526 list_add(&iu->list, &target->free_tx);
1527 if (iu_type != SRP_IU_RSP)
1528 ++target->req_lim;
e9684678 1529 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1530}
1531
05a1d750 1532/*
e9684678
BVA		 1533 * Must be called with target->lock held to protect req_lim and free_tx.
1534 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1535 *
1536 * Note:
1537 * An upper limit for the number of allocated information units for each
1538 * request type is:
1539 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1540 * more than Scsi_Host.can_queue requests.
1541 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1542 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1543 * one unanswered SRP request to an initiator.
1544 */
1545static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1546 enum srp_iu_type iu_type)
1547{
1548 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1549 struct srp_iu *iu;
1550
1551 srp_send_completion(target->send_cq, target);
1552
dcb4cb85 1553 if (list_empty(&target->free_tx))
05a1d750
DD		 1554 return NULL;
1555
1556 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1557 if (iu_type != SRP_IU_RSP) {
1558 if (target->req_lim <= rsv) {
1559 ++target->zero_req_lim;
1560 return NULL;
1561 }
1562
1563 --target->req_lim;
05a1d750
DD		 1564 }
1565
dcb4cb85 1566 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1567 list_del(&iu->list);
05a1d750
DD		 1568 return iu;
1569}
1570
76c75b25
BVA		 1571static int srp_post_send(struct srp_target_port *target,
1572 struct srp_iu *iu, int len)
05a1d750
DD		 1573{
1574 struct ib_sge list;
1575 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1576
1577 list.addr = iu->dma;
1578 list.length = len;
9af76271 1579 list.lkey = target->lkey;
05a1d750
DD		 1580
1581 wr.next = NULL;
dcb4cb85 1582 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1583 wr.sg_list = &list;
1584 wr.num_sge = 1;
1585 wr.opcode = IB_WR_SEND;
1586 wr.send_flags = IB_SEND_SIGNALED;
1587
76c75b25 1588 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1589}
1590
dcb4cb85 1591static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1592{
c996bb47 1593 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1594 struct ib_sge list;
c996bb47
BVA		 1595
1596 list.addr = iu->dma;
1597 list.length = iu->size;
9af76271 1598 list.lkey = target->lkey;
c996bb47
BVA		 1599
1600 wr.next = NULL;
dcb4cb85 1601 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1602 wr.sg_list = &list;
1603 wr.num_sge = 1;
1604
dcb4cb85 1605 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1606}
1607
aef9ec39
RD		 1608static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1609{
1610 struct srp_request *req;
1611 struct scsi_cmnd *scmnd;
1612 unsigned long flags;
aef9ec39 1613
aef9ec39 1614 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1615 spin_lock_irqsave(&target->lock, flags);
94a9174c 1616 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1617 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1618
f8b6e31e
DD		 1619 target->tsk_mgmt_status = -1;
1620 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1621 target->tsk_mgmt_status = rsp->data[3];
1622 complete(&target->tsk_mgmt_done);
aef9ec39 1623 } else {
f8b6e31e 1624 req = &target->req_ring[rsp->tag];
b3fe628d 1625 scmnd = srp_claim_req(target, req, NULL, NULL);
22032991 1626 if (!scmnd) {
7aa54bd7
DD		 1627 shost_printk(KERN_ERR, target->scsi_host,
1628 "Null scmnd for RSP w/tag %016llx\n",
1629 (unsigned long long) rsp->tag);
22032991
BVA		 1630
1631 spin_lock_irqsave(&target->lock, flags);
1632 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1633 spin_unlock_irqrestore(&target->lock, flags);
1634
1635 return;
1636 }
aef9ec39
RD		 1637 scmnd->result = rsp->status;
1638
1639 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1640 memcpy(scmnd->sense_buffer, rsp->data +
1641 be32_to_cpu(rsp->resp_data_len),
1642 min_t(int, be32_to_cpu(rsp->sense_data_len),
1643 SCSI_SENSE_BUFFERSIZE));
1644 }
1645
1646 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1647 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1648 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1649 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1650
22032991
BVA		 1651 srp_free_req(target, req, scmnd,
1652 be32_to_cpu(rsp->req_lim_delta));
1653
f8b6e31e
DD		 1654 scmnd->host_scribble = NULL;
1655 scmnd->scsi_done(scmnd);
aef9ec39 1656 }
aef9ec39
RD		 1657}
1658
bb12588a
DD		 1659static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1660 void *rsp, int len)
1661{
76c75b25 1662 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1663 unsigned long flags;
1664 struct srp_iu *iu;
76c75b25 1665 int err;
bb12588a 1666
e9684678 1667 spin_lock_irqsave(&target->lock, flags);
bb12588a 1668 target->req_lim += req_delta;
bb12588a 1669 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1670 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1671
bb12588a
DD		 1672 if (!iu) {
1673 shost_printk(KERN_ERR, target->scsi_host, PFX
1674 "no IU available to send response\n");
76c75b25 1675 return 1;
bb12588a
DD		 1676 }
1677
1678 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1679 memcpy(iu->buf, rsp, len);
1680 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1681
76c75b25
BVA		 1682 err = srp_post_send(target, iu, len);
1683 if (err) {
bb12588a
DD		 1684 shost_printk(KERN_ERR, target->scsi_host, PFX
1685 "unable to post response: %d\n", err);
76c75b25
BVA		 1686 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1687 }
bb12588a 1688
bb12588a
DD		 1689 return err;
1690}
1691
1692static void srp_process_cred_req(struct srp_target_port *target,
1693 struct srp_cred_req *req)
1694{
1695 struct srp_cred_rsp rsp = {
1696 .opcode = SRP_CRED_RSP,
1697 .tag = req->tag,
1698 };
1699 s32 delta = be32_to_cpu(req->req_lim_delta);
1700
1701 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1702 shost_printk(KERN_ERR, target->scsi_host, PFX
1703 "problems processing SRP_CRED_REQ\n");
1704}
1705
1706static void srp_process_aer_req(struct srp_target_port *target,
1707 struct srp_aer_req *req)
1708{
1709 struct srp_aer_rsp rsp = {
1710 .opcode = SRP_AER_RSP,
1711 .tag = req->tag,
1712 };
1713 s32 delta = be32_to_cpu(req->req_lim_delta);
1714
1715 shost_printk(KERN_ERR, target->scsi_host, PFX
1716 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1717
1718 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1719 shost_printk(KERN_ERR, target->scsi_host, PFX
1720 "problems processing SRP_AER_REQ\n");
1721}
1722
aef9ec39
RD		 1723static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1724{
dcb4cb85 1725 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1726 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1727 int res;
aef9ec39
RD		 1728 u8 opcode;
1729
85507bcc
RC		 1730 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1731 DMA_FROM_DEVICE);
aef9ec39
RD		 1732
1733 opcode = *(u8 *) iu->buf;
1734
1735 if (0) {
7aa54bd7
DD		 1736 shost_printk(KERN_ERR, target->scsi_host,
1737 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1738 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1739 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1740 }
1741
1742 switch (opcode) {
1743 case SRP_RSP:
1744 srp_process_rsp(target, iu->buf);
1745 break;
1746
bb12588a
DD		 1747 case SRP_CRED_REQ:
1748 srp_process_cred_req(target, iu->buf);
1749 break;
1750
1751 case SRP_AER_REQ:
1752 srp_process_aer_req(target, iu->buf);
1753 break;
1754
aef9ec39
RD		 1755 case SRP_T_LOGOUT:
1756 /* XXX Handle target logout */
7aa54bd7
DD		 1757 shost_printk(KERN_WARNING, target->scsi_host,
1758 PFX "Got target logout request\n");
aef9ec39
RD		 1759 break;
1760
1761 default:
7aa54bd7
DD		 1762 shost_printk(KERN_WARNING, target->scsi_host,
1763 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1764 break;
1765 }
1766
85507bcc
RC		 1767 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1768 DMA_FROM_DEVICE);
c996bb47 1769
dcb4cb85 1770 res = srp_post_recv(target, iu);
c996bb47
BVA		 1771 if (res != 0)
1772 shost_printk(KERN_ERR, target->scsi_host,
1773 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1774}
1775
c1120f89
BVA		 1776/**
1777 * srp_tl_err_work() - handle a transport layer error
af24663b 1778 * @work: Work structure embedded in an SRP target port.
c1120f89
BVA		 1779 *
1780 * Note: This function may get invoked before the rport has been created,
1781 * hence the target->rport test.
1782 */
1783static void srp_tl_err_work(struct work_struct *work)
1784{
1785 struct srp_target_port *target;
1786
1787 target = container_of(work, struct srp_target_port, tl_err_work);
1788 if (target->rport)
1789 srp_start_tl_fail_timers(target->rport);
1790}
1791
5cfb1782
BVA		 1792static void srp_handle_qp_err(u64 wr_id, enum ib_wc_status wc_status,
1793 bool send_err, struct srp_target_port *target)
948d1e88 1794{
294c875a 1795 if (target->connected && !target->qp_in_error) {
5cfb1782
BVA		 1796 if (wr_id & LOCAL_INV_WR_ID_MASK) {
1797 shost_printk(KERN_ERR, target->scsi_host, PFX
1798 "LOCAL_INV failed with status %d\n",
1799 wc_status);
1800 } else if (wr_id & FAST_REG_WR_ID_MASK) {
1801 shost_printk(KERN_ERR, target->scsi_host, PFX
1802 "FAST_REG_MR failed status %d\n",
1803 wc_status);
1804 } else {
1805 shost_printk(KERN_ERR, target->scsi_host,
1806 PFX "failed %s status %d for iu %p\n",
1807 send_err ? "send" : "receive",
1808 wc_status, (void *)(uintptr_t)wr_id);
1809 }
c1120f89 1810 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1811 }
948d1e88
BVA		 1812 target->qp_in_error = true;
1813}
1814
9c03dc9f 1815static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1816{
1817 struct srp_target_port *target = target_ptr;
1818 struct ib_wc wc;
aef9ec39
RD		 1819
1820 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1821 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1822 if (likely(wc.status == IB_WC_SUCCESS)) {
1823 srp_handle_recv(target, &wc);
1824 } else {
5cfb1782 1825 srp_handle_qp_err(wc.wr_id, wc.status, false, target);
aef9ec39 1826 }
9c03dc9f
BVA		 1827 }
1828}
1829
1830static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1831{
1832 struct srp_target_port *target = target_ptr;
1833 struct ib_wc wc;
dcb4cb85 1834 struct srp_iu *iu;
9c03dc9f
BVA		 1835
1836 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1837 if (likely(wc.status == IB_WC_SUCCESS)) {
1838 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1839 list_add(&iu->list, &target->free_tx);
1840 } else {
5cfb1782 1841 srp_handle_qp_err(wc.wr_id, wc.status, true, target);
9c03dc9f 1842 }
aef9ec39
RD		 1843 }
1844}
1845
76c75b25 1846static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1847{
76c75b25 1848 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1849 struct srp_rport *rport = target->rport;
aef9ec39
RD		 1850 struct srp_request *req;
1851 struct srp_iu *iu;
1852 struct srp_cmd *cmd;
85507bcc 1853 struct ib_device *dev;
76c75b25 1854 unsigned long flags;
d1b4289e 1855 int len, ret;
a95cadb9
BVA		 1856 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1857
1858 /*
1859 * The SCSI EH thread is the only context from which srp_queuecommand()
1860 * can get invoked for blocked devices (SDEV_BLOCK /
1861 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1862 * locking the rport mutex if invoked from inside the SCSI EH.
1863 */
1864 if (in_scsi_eh)
1865 mutex_lock(&rport->mutex);
aef9ec39 1866
d1b4289e
BVA		 1867 scmnd->result = srp_chkready(target->rport);
1868 if (unlikely(scmnd->result))
1869 goto err;
2ce19e72 1870
e9684678 1871 spin_lock_irqsave(&target->lock, flags);
bb12588a 1872 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1873 if (!iu)
695b8349
BVA		 1874 goto err_unlock;
1875
1876 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1877 list_del(&req->list);
1878 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1879
05321937 1880 dev = target->srp_host->srp_dev->dev;
49248644 1881 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1882 DMA_TO_DEVICE);
aef9ec39 1883
f8b6e31e 1884 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1885
1886 cmd = iu->buf;
1887 memset(cmd, 0, sizeof *cmd);
1888
1889 cmd->opcode = SRP_CMD;
1890 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1891 cmd->tag = req->index;
aef9ec39
RD		 1892 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1893
aef9ec39
RD		 1894 req->scmnd = scmnd;
1895 req->cmd = iu;
aef9ec39
RD		 1896
1897 len = srp_map_data(scmnd, target, req);
1898 if (len < 0) {
7aa54bd7 1899 shost_printk(KERN_ERR, target->scsi_host,
d1b4289e
BVA		 1900 PFX "Failed to map data (%d)\n", len);
1901 /*
1902 * If we ran out of memory descriptors (-ENOMEM) because an
1903 * application is queuing many requests with more than
52ede08f 1904 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
d1b4289e
BVA		 1905 * to reduce queue depth temporarily.
1906 */
1907 scmnd->result = len == -ENOMEM ?
1908 DID_OK << 16 | QUEUE_FULL << 1 : DID_ERROR << 16;
76c75b25 1909 goto err_iu;
aef9ec39
RD		 1910 }
1911
49248644 1912 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1913 DMA_TO_DEVICE);
aef9ec39 1914
76c75b25 1915 if (srp_post_send(target, iu, len)) {
7aa54bd7 1916 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1917 goto err_unmap;
1918 }
1919
d1b4289e
BVA		 1920 ret = 0;
1921
a95cadb9
BVA		 1922unlock_rport:
1923 if (in_scsi_eh)
1924 mutex_unlock(&rport->mutex);
1925
d1b4289e 1926 return ret;
aef9ec39
RD		 1927
1928err_unmap:
1929 srp_unmap_data(scmnd, target, req);
1930
76c75b25
BVA		 1931err_iu:
1932 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1933
024ca901
BVA		 1934 /*
1935 * Avoid that the loops that iterate over the request ring can
1936 * encounter a dangling SCSI command pointer.
1937 */
1938 req->scmnd = NULL;
1939
e9684678 1940 spin_lock_irqsave(&target->lock, flags);
76c75b25 1941 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1942
1943err_unlock:
e9684678 1944 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1945
d1b4289e
BVA		 1946err:
1947 if (scmnd->result) {
1948 scmnd->scsi_done(scmnd);
1949 ret = 0;
1950 } else {
1951 ret = SCSI_MLQUEUE_HOST_BUSY;
1952 }
a95cadb9 1953
d1b4289e 1954 goto unlock_rport;
aef9ec39
RD		 1955}
1956
4d73f95f
BVA		 1957/*
1958 * Note: the resources allocated in this function are freed in
1959 * srp_free_target_ib().
1960 */
aef9ec39
RD		 1961static int srp_alloc_iu_bufs(struct srp_target_port *target)
1962{
1963 int i;
1964
4d73f95f
BVA		 1965 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1966 GFP_KERNEL);
1967 if (!target->rx_ring)
1968 goto err_no_ring;
1969 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1970 GFP_KERNEL);
1971 if (!target->tx_ring)
1972 goto err_no_ring;
1973
1974 for (i = 0; i < target->queue_size; ++i) {
aef9ec39
RD		 1975 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1976 target->max_ti_iu_len,
1977 GFP_KERNEL, DMA_FROM_DEVICE);
1978 if (!target->rx_ring[i])
1979 goto err;
1980 }
1981
4d73f95f 1982 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1983 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1984 target->max_iu_len,
aef9ec39
RD		 1985 GFP_KERNEL, DMA_TO_DEVICE);
1986 if (!target->tx_ring[i])
1987 goto err;
dcb4cb85
BVA		 1988
1989 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1990 }
1991
1992 return 0;
1993
1994err:
4d73f95f 1995 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1996 srp_free_iu(target->srp_host, target->rx_ring[i]);
aef9ec39 1997 srp_free_iu(target->srp_host, target->tx_ring[i]);
aef9ec39
RD		 1998 }
1999
4d73f95f
BVA		 2000
2001err_no_ring:
2002 kfree(target->tx_ring);
2003 target->tx_ring = NULL;
2004 kfree(target->rx_ring);
2005 target->rx_ring = NULL;
2006
aef9ec39
RD		 2007 return -ENOMEM;
2008}
2009
c9b03c1a
BVA		 2010static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
2011{
2012 uint64_t T_tr_ns, max_compl_time_ms;
2013 uint32_t rq_tmo_jiffies;
2014
2015 /*
2016 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
2017 * table 91), both the QP timeout and the retry count have to be set
2018 * for RC QP's during the RTR to RTS transition.
2019 */
2020 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
2021 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
2022
2023 /*
2024 * Set target->rq_tmo_jiffies to one second more than the largest time
2025 * it can take before an error completion is generated. See also
2026 * C9-140..142 in the IBTA spec for more information about how to
2027 * convert the QP Local ACK Timeout value to nanoseconds.
2028 */
2029 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
2030 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
2031 do_div(max_compl_time_ms, NSEC_PER_MSEC);
2032 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
2033
2034 return rq_tmo_jiffies;
2035}
2036
961e0be8
DD		 2037static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
2038 struct srp_login_rsp *lrsp,
2039 struct srp_target_port *target)
2040{
2041 struct ib_qp_attr *qp_attr = NULL;
2042 int attr_mask = 0;
2043 int ret;
2044 int i;
2045
2046 if (lrsp->opcode == SRP_LOGIN_RSP) {
2047 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
2048 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
2049
2050 /*
2051 * Reserve credits for task management so we don't
2052 * bounce requests back to the SCSI mid-layer.
2053 */
2054 target->scsi_host->can_queue
2055 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
2056 target->scsi_host->can_queue);
4d73f95f
BVA		 2057 target->scsi_host->cmd_per_lun
2058 = min_t(int, target->scsi_host->can_queue,
2059 target->scsi_host->cmd_per_lun);
961e0be8
DD		 2060 } else {
2061 shost_printk(KERN_WARNING, target->scsi_host,
2062 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
2063 ret = -ECONNRESET;
2064 goto error;
2065 }
2066
4d73f95f 2067 if (!target->rx_ring) {
961e0be8
DD		 2068 ret = srp_alloc_iu_bufs(target);
2069 if (ret)
2070 goto error;
2071 }
2072
2073 ret = -ENOMEM;
2074 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
2075 if (!qp_attr)
2076 goto error;
2077
2078 qp_attr->qp_state = IB_QPS_RTR;
2079 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2080 if (ret)
2081 goto error_free;
2082
2083 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
2084 if (ret)
2085 goto error_free;
2086
4d73f95f 2087 for (i = 0; i < target->queue_size; i++) {
961e0be8
DD		 2088 struct srp_iu *iu = target->rx_ring[i];
2089 ret = srp_post_recv(target, iu);
2090 if (ret)
2091 goto error_free;
2092 }
2093
2094 qp_attr->qp_state = IB_QPS_RTS;
2095 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2096 if (ret)
2097 goto error_free;
2098
c9b03c1a
BVA		 2099 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
2100
961e0be8
DD		 2101 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
2102 if (ret)
2103 goto error_free;
2104
2105 ret = ib_send_cm_rtu(cm_id, NULL, 0);
2106
2107error_free:
2108 kfree(qp_attr);
2109
2110error:
2111 target->status = ret;
2112}
2113
aef9ec39
RD		 2114static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
2115 struct ib_cm_event *event,
2116 struct srp_target_port *target)
2117{
7aa54bd7 2118 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 2119 struct ib_class_port_info *cpi;
2120 int opcode;
2121
2122 switch (event->param.rej_rcvd.reason) {
2123 case IB_CM_REJ_PORT_CM_REDIRECT:
2124 cpi = event->param.rej_rcvd.ari;
2125 target->path.dlid = cpi->redirect_lid;
2126 target->path.pkey = cpi->redirect_pkey;
2127 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
2128 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
2129
2130 target->status = target->path.dlid ?
2131 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
2132 break;
2133
2134 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 2135 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 2136 /*
2137 * Topspin/Cisco SRP gateways incorrectly send
2138 * reject reason code 25 when they mean 24
2139 * (port redirect).
2140 */
2141 memcpy(target->path.dgid.raw,
2142 event->param.rej_rcvd.ari, 16);
2143
7aa54bd7
DD		 2144 shost_printk(KERN_DEBUG, shost,
2145 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
2146 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
2147 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 2148
2149 target->status = SRP_PORT_REDIRECT;
2150 } else {
7aa54bd7
DD		 2151 shost_printk(KERN_WARNING, shost,
2152 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 2153 target->status = -ECONNRESET;
2154 }
2155 break;
2156
2157 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 2158 shost_printk(KERN_WARNING, shost,
2159 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 2160 target->status = -ECONNRESET;
2161 break;
2162
2163 case IB_CM_REJ_CONSUMER_DEFINED:
2164 opcode = *(u8 *) event->private_data;
2165 if (opcode == SRP_LOGIN_REJ) {
2166 struct srp_login_rej *rej = event->private_data;
2167 u32 reason = be32_to_cpu(rej->reason);
2168
2169 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 2170 shost_printk(KERN_WARNING, shost,
2171 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 2172 else
e7ffde01
BVA		 2173 shost_printk(KERN_WARNING, shost, PFX
2174 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
2175 target->path.sgid.raw,
2176 target->orig_dgid, reason);
aef9ec39 2177 } else
7aa54bd7
DD		 2178 shost_printk(KERN_WARNING, shost,
2179 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
2180 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 2181 target->status = -ECONNRESET;
2182 break;
2183
9fe4bcf4
DD		 2184 case IB_CM_REJ_STALE_CONN:
2185 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
2186 target->status = SRP_STALE_CONN;
2187 break;
2188
aef9ec39 2189 default:
7aa54bd7
DD		 2190 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
2191 event->param.rej_rcvd.reason);
aef9ec39
RD		 2192 target->status = -ECONNRESET;
2193 }
2194}
2195
2196static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2197{
2198 struct srp_target_port *target = cm_id->context;
aef9ec39 2199 int comp = 0;
aef9ec39
RD		 2200
2201 switch (event->event) {
2202 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 2203 shost_printk(KERN_DEBUG, target->scsi_host,
2204 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 2205 comp = 1;
2206 target->status = -ECONNRESET;
2207 break;
2208
2209 case IB_CM_REP_RECEIVED:
2210 comp = 1;
961e0be8 2211 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 2212 break;
2213
2214 case IB_CM_REJ_RECEIVED:
7aa54bd7 2215 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 2216 comp = 1;
2217
2218 srp_cm_rej_handler(cm_id, event, target);
2219 break;
2220
b7ac4ab4 2221 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 2222 shost_printk(KERN_WARNING, target->scsi_host,
2223 PFX "DREQ received - connection closed\n");
294c875a 2224 srp_change_conn_state(target, false);
b7ac4ab4 2225 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 2226 shost_printk(KERN_ERR, target->scsi_host,
2227 PFX "Sending CM DREP failed\n");
c1120f89 2228 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 2229 break;
2230
2231 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 2232 shost_printk(KERN_ERR, target->scsi_host,
2233 PFX "connection closed\n");
ac72d766 2234 comp = 1;
aef9ec39 2235
aef9ec39
RD		 2236 target->status = 0;
2237 break;
2238
b7ac4ab4
IR		 2239 case IB_CM_MRA_RECEIVED:
2240 case IB_CM_DREQ_ERROR:
2241 case IB_CM_DREP_RECEIVED:
2242 break;
2243
aef9ec39 2244 default:
7aa54bd7
DD		 2245 shost_printk(KERN_WARNING, target->scsi_host,
2246 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 2247 break;
2248 }
2249
2250 if (comp)
2251 complete(&target->done);
2252
aef9ec39
RD		 2253 return 0;
2254}
2255
71444b97
JW		 2256/**
2257 * srp_change_queue_type - changing device queue tag type
2258 * @sdev: scsi device struct
2259 * @tag_type: requested tag type
2260 *
2261 * Returns queue tag type.
2262 */
2263static int
2264srp_change_queue_type(struct scsi_device *sdev, int tag_type)
2265{
2266 if (sdev->tagged_supported) {
2267 scsi_set_tag_type(sdev, tag_type);
2268 if (tag_type)
2269 scsi_activate_tcq(sdev, sdev->queue_depth);
2270 else
2271 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2272 } else
2273 tag_type = 0;
2274
2275 return tag_type;
2276}
2277
2278/**
2279 * srp_change_queue_depth - setting device queue depth
2280 * @sdev: scsi device struct
2281 * @qdepth: requested queue depth
2282 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
2283 * (see include/scsi/scsi_host.h for definition)
2284 *
2285 * Returns queue depth.
2286 */
2287static int
2288srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2289{
2290 struct Scsi_Host *shost = sdev->host;
2291 int max_depth;
2292 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
2293 max_depth = shost->can_queue;
2294 if (!sdev->tagged_supported)
2295 max_depth = 1;
2296 if (qdepth > max_depth)
2297 qdepth = max_depth;
2298 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2299 } else if (reason == SCSI_QDEPTH_QFULL)
2300 scsi_track_queue_full(sdev, qdepth);
2301 else
2302 return -EOPNOTSUPP;
2303
2304 return sdev->queue_depth;
2305}
2306
d945e1df 2307static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 2308 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 2309{
a95cadb9 2310 struct srp_rport *rport = target->rport;
19081f31 2311 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 2312 struct srp_iu *iu;
2313 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 2314
3780d1f0
BVA		 2315 if (!target->connected || target->qp_in_error)
2316 return -1;
2317
f8b6e31e 2318 init_completion(&target->tsk_mgmt_done);
aef9ec39 2319
a95cadb9
BVA		 2320 /*
2321 * Lock the rport mutex to avoid that srp_create_target_ib() is
2322 * invoked while a task management function is being sent.
2323 */
2324 mutex_lock(&rport->mutex);
e9684678 2325 spin_lock_irq(&target->lock);
bb12588a 2326 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 2327 spin_unlock_irq(&target->lock);
76c75b25 2328
a95cadb9
BVA		 2329 if (!iu) {
2330 mutex_unlock(&rport->mutex);
2331
76c75b25 2332 return -1;
a95cadb9 2333 }
aef9ec39 2334
19081f31
DD		 2335 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
2336 DMA_TO_DEVICE);
aef9ec39
RD		 2337 tsk_mgmt = iu->buf;
2338 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2339
2340 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 2341 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
2342 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 2343 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 2344 tsk_mgmt->task_tag = req_tag;
aef9ec39 2345
19081f31
DD		 2346 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2347 DMA_TO_DEVICE);
76c75b25
BVA		 2348 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
2349 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 2350 mutex_unlock(&rport->mutex);
2351
76c75b25
BVA		 2352 return -1;
2353 }
a95cadb9 2354 mutex_unlock(&rport->mutex);
d945e1df 2355
f8b6e31e 2356 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 2357 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 2358 return -1;
aef9ec39 2359
d945e1df 2360 return 0;
d945e1df
RD		 2361}
2362
aef9ec39
RD		 2363static int srp_abort(struct scsi_cmnd *scmnd)
2364{
d945e1df 2365 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 2366 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
086f44f5 2367 int ret;
d945e1df 2368
7aa54bd7 2369 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 2370
b3fe628d 2371 if (!req || !srp_claim_req(target, req, NULL, scmnd))
99b6697a 2372 return SUCCESS;
086f44f5 2373 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
80d5e8a2 2374 SRP_TSK_ABORT_TASK) == 0)
086f44f5 2375 ret = SUCCESS;
ed9b2264 2376 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 2377 ret = FAST_IO_FAIL;
086f44f5
BVA		 2378 else
2379 ret = FAILED;
22032991
BVA		 2380 srp_free_req(target, req, scmnd, 0);
2381 scmnd->result = DID_ABORT << 16;
d8536670 2382 scmnd->scsi_done(scmnd);
d945e1df 2383
086f44f5 2384 return ret;
aef9ec39
RD		 2385}
2386
2387static int srp_reset_device(struct scsi_cmnd *scmnd)
2388{
d945e1df 2389 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 2390 int i;
d945e1df 2391
7aa54bd7 2392 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 2393
f8b6e31e
DD		 2394 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2395 SRP_TSK_LUN_RESET))
d945e1df 2396 return FAILED;
f8b6e31e 2397 if (target->tsk_mgmt_status)
d945e1df
RD		 2398 return FAILED;
2399
4d73f95f 2400 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 2401 struct srp_request *req = &target->req_ring[i];
b3fe628d 2402 srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
536ae14e 2403 }
d945e1df 2404
d945e1df 2405 return SUCCESS;
aef9ec39
RD		 2406}
2407
2408static int srp_reset_host(struct scsi_cmnd *scmnd)
2409{
2410 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 2411
7aa54bd7 2412 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 2413
ed9b2264 2414 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 2415}
2416
c9b03c1a
BVA		 2417static int srp_slave_configure(struct scsi_device *sdev)
2418{
2419 struct Scsi_Host *shost = sdev->host;
2420 struct srp_target_port *target = host_to_target(shost);
2421 struct request_queue *q = sdev->request_queue;
2422 unsigned long timeout;
2423
2424 if (sdev->type == TYPE_DISK) {
2425 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2426 blk_queue_rq_timeout(q, timeout);
2427 }
2428
2429 return 0;
2430}
2431
ee959b00
TJ		 2432static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2433 char *buf)
6ecb0c84 2434{
ee959b00 2435 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2436
6ecb0c84
RD		 2437 return sprintf(buf, "0x%016llx\n",
2438 (unsigned long long) be64_to_cpu(target->id_ext));
2439}
2440
ee959b00
TJ		 2441static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2442 char *buf)
6ecb0c84 2443{
ee959b00 2444 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2445
6ecb0c84
RD		 2446 return sprintf(buf, "0x%016llx\n",
2447 (unsigned long long) be64_to_cpu(target->ioc_guid));
2448}
2449
ee959b00
TJ		 2450static ssize_t show_service_id(struct device *dev,
2451 struct device_attribute *attr, char *buf)
6ecb0c84 2452{
ee959b00 2453 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2454
6ecb0c84
RD		 2455 return sprintf(buf, "0x%016llx\n",
2456 (unsigned long long) be64_to_cpu(target->service_id));
2457}
2458
ee959b00
TJ		 2459static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2460 char *buf)
6ecb0c84 2461{
ee959b00 2462 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2463
6ecb0c84
RD		 2464 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2465}
2466
848b3082
BVA		 2467static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2468 char *buf)
2469{
2470 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2471
2472 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2473}
2474
ee959b00
TJ		 2475static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2476 char *buf)
6ecb0c84 2477{
ee959b00 2478 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2479
5b095d98 2480 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 2481}
2482
ee959b00
TJ		 2483static ssize_t show_orig_dgid(struct device *dev,
2484 struct device_attribute *attr, char *buf)
3633b3d0 2485{
ee959b00 2486 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 2487
5b095d98 2488 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 2489}
2490
89de7486
BVA		 2491static ssize_t show_req_lim(struct device *dev,
2492 struct device_attribute *attr, char *buf)
2493{
2494 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2495
89de7486
BVA		 2496 return sprintf(buf, "%d\n", target->req_lim);
2497}
2498
ee959b00
TJ		 2499static ssize_t show_zero_req_lim(struct device *dev,
2500 struct device_attribute *attr, char *buf)
6bfa24fa 2501{
ee959b00 2502 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 2503
6bfa24fa
RD		 2504 return sprintf(buf, "%d\n", target->zero_req_lim);
2505}
2506
ee959b00
TJ		 2507static ssize_t show_local_ib_port(struct device *dev,
2508 struct device_attribute *attr, char *buf)
ded7f1a1 2509{
ee959b00 2510 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2511
2512 return sprintf(buf, "%d\n", target->srp_host->port);
2513}
2514
ee959b00
TJ		 2515static ssize_t show_local_ib_device(struct device *dev,
2516 struct device_attribute *attr, char *buf)
ded7f1a1 2517{
ee959b00 2518 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2519
05321937 2520 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2521}
2522
4b5e5f41
BVA		 2523static ssize_t show_comp_vector(struct device *dev,
2524 struct device_attribute *attr, char *buf)
2525{
2526 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2527
2528 return sprintf(buf, "%d\n", target->comp_vector);
2529}
2530
7bb312e4
VP		 2531static ssize_t show_tl_retry_count(struct device *dev,
2532 struct device_attribute *attr, char *buf)
2533{
2534 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2535
2536 return sprintf(buf, "%d\n", target->tl_retry_count);
2537}
2538
49248644
DD		 2539static ssize_t show_cmd_sg_entries(struct device *dev,
2540 struct device_attribute *attr, char *buf)
2541{
2542 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2543
2544 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2545}
2546
c07d424d
DD		 2547static ssize_t show_allow_ext_sg(struct device *dev,
2548 struct device_attribute *attr, char *buf)
2549{
2550 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2551
2552 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2553}
2554
ee959b00
TJ		 2555static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2556static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2557static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2558static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
848b3082 2559static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
ee959b00
TJ		 2560static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2561static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2562static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2563static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2564static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2565static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2566static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2567static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2568static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2569static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2570
2571static struct device_attribute *srp_host_attrs[] = {
2572 &dev_attr_id_ext,
2573 &dev_attr_ioc_guid,
2574 &dev_attr_service_id,
2575 &dev_attr_pkey,
848b3082 2576 &dev_attr_sgid,
ee959b00
TJ		 2577 &dev_attr_dgid,
2578 &dev_attr_orig_dgid,
89de7486 2579 &dev_attr_req_lim,
ee959b00
TJ		 2580 &dev_attr_zero_req_lim,
2581 &dev_attr_local_ib_port,
2582 &dev_attr_local_ib_device,
4b5e5f41 2583 &dev_attr_comp_vector,
7bb312e4 2584 &dev_attr_tl_retry_count,
49248644 2585 &dev_attr_cmd_sg_entries,
c07d424d 2586 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2587 NULL
2588};
2589
aef9ec39
RD		 2590static struct scsi_host_template srp_template = {
2591 .module = THIS_MODULE,
b7f008fd
RD		 2592 .name = "InfiniBand SRP initiator",
2593 .proc_name = DRV_NAME,
c9b03c1a 2594 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2595 .info = srp_target_info,
2596 .queuecommand = srp_queuecommand,
71444b97
JW		 2597 .change_queue_depth = srp_change_queue_depth,
2598 .change_queue_type = srp_change_queue_type,
aef9ec39
RD		 2599 .eh_abort_handler = srp_abort,
2600 .eh_device_reset_handler = srp_reset_device,
2601 .eh_host_reset_handler = srp_reset_host,
2742c1da 2602 .skip_settle_delay = true,
49248644 2603 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
4d73f95f 2604 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
aef9ec39 2605 .this_id = -1,
4d73f95f 2606 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
6ecb0c84
RD		 2607 .use_clustering = ENABLE_CLUSTERING,
2608 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2609};
2610
2611static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2612{
3236822b
FT		 2613 struct srp_rport_identifiers ids;
2614 struct srp_rport *rport;
2615
aef9ec39
RD		 2616 sprintf(target->target_name, "SRP.T10:%016llX",
2617 (unsigned long long) be64_to_cpu(target->id_ext));
2618
05321937 2619 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2620 return -ENODEV;
2621
3236822b
FT		 2622 memcpy(ids.port_id, &target->id_ext, 8);
2623 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2624 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2625 rport = srp_rport_add(target->scsi_host, &ids);
2626 if (IS_ERR(rport)) {
2627 scsi_remove_host(target->scsi_host);
2628 return PTR_ERR(rport);
2629 }
2630
dc1bdbd9 2631 rport->lld_data = target;
9dd69a60 2632 target->rport = rport;
dc1bdbd9 2633
b3589fd4 2634 spin_lock(&host->target_lock);
aef9ec39 2635 list_add_tail(&target->list, &host->target_list);
b3589fd4 2636 spin_unlock(&host->target_lock);
aef9ec39
RD		 2637
2638 target->state = SRP_TARGET_LIVE;
2639
aef9ec39 2640 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2641 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 2642
2643 return 0;
2644}
2645
ee959b00 2646static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2647{
2648 struct srp_host *host =
ee959b00 2649 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2650
2651 complete(&host->released);
2652}
2653
2654static struct class srp_class = {
2655 .name = "infiniband_srp",
ee959b00 2656 .dev_release = srp_release_dev
aef9ec39
RD		 2657};
2658
96fc248a
BVA		 2659/**
2660 * srp_conn_unique() - check whether the connection to a target is unique
af24663b
BVA		 2661 * @host: SRP host.
2662 * @target: SRP target port.
96fc248a
BVA		 2663 */
2664static bool srp_conn_unique(struct srp_host *host,
2665 struct srp_target_port *target)
2666{
2667 struct srp_target_port *t;
2668 bool ret = false;
2669
2670 if (target->state == SRP_TARGET_REMOVED)
2671 goto out;
2672
2673 ret = true;
2674
2675 spin_lock(&host->target_lock);
2676 list_for_each_entry(t, &host->target_list, list) {
2677 if (t != target &&
2678 target->id_ext == t->id_ext &&
2679 target->ioc_guid == t->ioc_guid &&
2680 target->initiator_ext == t->initiator_ext) {
2681 ret = false;
2682 break;
2683 }
2684 }
2685 spin_unlock(&host->target_lock);
2686
2687out:
2688 return ret;
2689}
2690
aef9ec39
RD		 2691/*
2692 * Target ports are added by writing
2693 *
2694 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2695 * pkey=<P_Key>,service_id=<service ID>
2696 *
2697 * to the add_target sysfs attribute.
2698 */
2699enum {
2700 SRP_OPT_ERR = 0,
2701 SRP_OPT_ID_EXT = 1 << 0,
2702 SRP_OPT_IOC_GUID = 1 << 1,
2703 SRP_OPT_DGID = 1 << 2,
2704 SRP_OPT_PKEY = 1 << 3,
2705 SRP_OPT_SERVICE_ID = 1 << 4,
2706 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2707 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2708 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2709 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2710 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2711 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2712 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2713 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2714 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
4d73f95f 2715 SRP_OPT_QUEUE_SIZE = 1 << 14,
aef9ec39
RD		 2716 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2717 SRP_OPT_IOC_GUID |
2718 SRP_OPT_DGID |
2719 SRP_OPT_PKEY |
2720 SRP_OPT_SERVICE_ID),
2721};
2722
a447c093 2723static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2724 { SRP_OPT_ID_EXT, "id_ext=%s" },
2725 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2726 { SRP_OPT_DGID, "dgid=%s" },
2727 { SRP_OPT_PKEY, "pkey=%x" },
2728 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2729 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2730 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2731 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2732 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2733 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2734 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2735 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2736 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2737 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
4d73f95f 2738 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
52fb2b50 2739 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2740};
2741
2742static int srp_parse_options(const char *buf, struct srp_target_port *target)
2743{
2744 char *options, *sep_opt;
2745 char *p;
2746 char dgid[3];
2747 substring_t args[MAX_OPT_ARGS];
2748 int opt_mask = 0;
2749 int token;
2750 int ret = -EINVAL;
2751 int i;
2752
2753 options = kstrdup(buf, GFP_KERNEL);
2754 if (!options)
2755 return -ENOMEM;
2756
2757 sep_opt = options;
2758 while ((p = strsep(&sep_opt, ",")) != NULL) {
2759 if (!*p)
2760 continue;
2761
2762 token = match_token(p, srp_opt_tokens, args);
2763 opt_mask |= token;
2764
2765 switch (token) {
2766 case SRP_OPT_ID_EXT:
2767 p = match_strdup(args);
a20f3a6d
IR		 2768 if (!p) {
2769 ret = -ENOMEM;
2770 goto out;
2771 }
aef9ec39
RD		 2772 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2773 kfree(p);
2774 break;
2775
2776 case SRP_OPT_IOC_GUID:
2777 p = match_strdup(args);
a20f3a6d
IR		 2778 if (!p) {
2779 ret = -ENOMEM;
2780 goto out;
2781 }
aef9ec39
RD		 2782 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2783 kfree(p);
2784 break;
2785
2786 case SRP_OPT_DGID:
2787 p = match_strdup(args);
a20f3a6d
IR		 2788 if (!p) {
2789 ret = -ENOMEM;
2790 goto out;
2791 }
aef9ec39 2792 if (strlen(p) != 32) {
e0bda7d8 2793 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2794 kfree(p);
aef9ec39
RD		 2795 goto out;
2796 }
2797
2798 for (i = 0; i < 16; ++i) {
2799 strlcpy(dgid, p + i * 2, 3);
2800 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2801 }
bf17c1c7 2802 kfree(p);
3633b3d0 2803 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2804 break;
2805
2806 case SRP_OPT_PKEY:
2807 if (match_hex(args, &token)) {
e0bda7d8 2808 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2809 goto out;
2810 }
2811 target->path.pkey = cpu_to_be16(token);
2812 break;
2813
2814 case SRP_OPT_SERVICE_ID:
2815 p = match_strdup(args);
a20f3a6d
IR		 2816 if (!p) {
2817 ret = -ENOMEM;
2818 goto out;
2819 }
aef9ec39 2820 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2821 target->path.service_id = target->service_id;
aef9ec39
RD		 2822 kfree(p);
2823 break;
2824
2825 case SRP_OPT_MAX_SECT:
2826 if (match_int(args, &token)) {
e0bda7d8 2827 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2828 goto out;
2829 }
2830 target->scsi_host->max_sectors = token;
2831 break;
2832
4d73f95f
BVA		 2833 case SRP_OPT_QUEUE_SIZE:
2834 if (match_int(args, &token) || token < 1) {
2835 pr_warn("bad queue_size parameter '%s'\n", p);
2836 goto out;
2837 }
2838 target->scsi_host->can_queue = token;
2839 target->queue_size = token + SRP_RSP_SQ_SIZE +
2840 SRP_TSK_MGMT_SQ_SIZE;
2841 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2842 target->scsi_host->cmd_per_lun = token;
2843 break;
2844
52fb2b50 2845 case SRP_OPT_MAX_CMD_PER_LUN:
4d73f95f 2846 if (match_int(args, &token) || token < 1) {
e0bda7d8
BVA		 2847 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2848 p);
52fb2b50
VP		 2849 goto out;
2850 }
4d73f95f 2851 target->scsi_host->cmd_per_lun = token;
52fb2b50
VP		 2852 break;
2853
0c0450db
R		 2854 case SRP_OPT_IO_CLASS:
2855 if (match_hex(args, &token)) {
e0bda7d8 2856 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2857 goto out;
2858 }
2859 if (token != SRP_REV10_IB_IO_CLASS &&
2860 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2861 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2862 token, SRP_REV10_IB_IO_CLASS,
2863 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2864 goto out;
2865 }
2866 target->io_class = token;
2867 break;
2868
01cb9bcb
IR		 2869 case SRP_OPT_INITIATOR_EXT:
2870 p = match_strdup(args);
a20f3a6d
IR		 2871 if (!p) {
2872 ret = -ENOMEM;
2873 goto out;
2874 }
01cb9bcb
IR		 2875 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2876 kfree(p);
2877 break;
2878
49248644
DD		 2879 case SRP_OPT_CMD_SG_ENTRIES:
2880 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2881 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2882 p);
49248644
DD		 2883 goto out;
2884 }
2885 target->cmd_sg_cnt = token;
2886 break;
2887
c07d424d
DD		 2888 case SRP_OPT_ALLOW_EXT_SG:
2889 if (match_int(args, &token)) {
e0bda7d8 2890 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2891 goto out;
2892 }
2893 target->allow_ext_sg = !!token;
2894 break;
2895
2896 case SRP_OPT_SG_TABLESIZE:
2897 if (match_int(args, &token) || token < 1 ||
2898 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2899 pr_warn("bad max sg_tablesize parameter '%s'\n",
2900 p);
c07d424d
DD		 2901 goto out;
2902 }
2903 target->sg_tablesize = token;
2904 break;
2905
4b5e5f41
BVA		 2906 case SRP_OPT_COMP_VECTOR:
2907 if (match_int(args, &token) || token < 0) {
2908 pr_warn("bad comp_vector parameter '%s'\n", p);
2909 goto out;
2910 }
2911 target->comp_vector = token;
2912 break;
2913
7bb312e4
VP		 2914 case SRP_OPT_TL_RETRY_COUNT:
2915 if (match_int(args, &token) || token < 2 || token > 7) {
2916 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2917 p);
2918 goto out;
2919 }
2920 target->tl_retry_count = token;
2921 break;
2922
aef9ec39 2923 default:
e0bda7d8
BVA		 2924 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2925 p);
aef9ec39
RD		 2926 goto out;
2927 }
2928 }
2929
2930 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2931 ret = 0;
2932 else
2933 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2934 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2935 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2936 pr_warn("target creation request is missing parameter '%s'\n",
2937 srp_opt_tokens[i].pattern);
aef9ec39 2938
4d73f95f
BVA		 2939 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2940 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2941 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2942 target->scsi_host->cmd_per_lun,
2943 target->scsi_host->can_queue);
2944
aef9ec39
RD		 2945out:
2946 kfree(options);
2947 return ret;
2948}
2949
ee959b00
TJ		 2950static ssize_t srp_create_target(struct device *dev,
2951 struct device_attribute *attr,
aef9ec39
RD		 2952 const char *buf, size_t count)
2953{
2954 struct srp_host *host =
ee959b00 2955 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2956 struct Scsi_Host *target_host;
2957 struct srp_target_port *target;
d1b4289e
BVA		 2958 struct srp_device *srp_dev = host->srp_dev;
2959 struct ib_device *ibdev = srp_dev->dev;
b81d00bd 2960 int ret;
aef9ec39
RD		 2961
2962 target_host = scsi_host_alloc(&srp_template,
2963 sizeof (struct srp_target_port));
2964 if (!target_host)
2965 return -ENOMEM;
2966
49248644 2967 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2968 target_host->max_channel = 0;
2969 target_host->max_id = 1;
3c8edf0e
AR		 2970 target_host->max_lun = SRP_MAX_LUN;
2971 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2972
aef9ec39 2973 target = host_to_target(target_host);
aef9ec39 2974
49248644
DD		 2975 target->io_class = SRP_REV16A_IB_IO_CLASS;
2976 target->scsi_host = target_host;
2977 target->srp_host = host;
2978 target->lkey = host->srp_dev->mr->lkey;
2979 target->rkey = host->srp_dev->mr->rkey;
2980 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2981 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2982 target->allow_ext_sg = allow_ext_sg;
7bb312e4 2983 target->tl_retry_count = 7;
4d73f95f 2984 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
aef9ec39 2985
2d7091bc
BVA		 2986 mutex_lock(&host->add_target_mutex);
2987
aef9ec39
RD		 2988 ret = srp_parse_options(buf, target);
2989 if (ret)
2990 goto err;
2991
4d73f95f
BVA		 2992 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2993
96fc248a
BVA		 2994 if (!srp_conn_unique(target->srp_host, target)) {
2995 shost_printk(KERN_INFO, target->scsi_host,
2996 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2997 be64_to_cpu(target->id_ext),
2998 be64_to_cpu(target->ioc_guid),
2999 be64_to_cpu(target->initiator_ext));
3000 ret = -EEXIST;
3001 goto err;
3002 }
3003
5cfb1782 3004 if (!srp_dev->has_fmr && !srp_dev->has_fr && !target->allow_ext_sg &&
d1b4289e 3005 target->cmd_sg_cnt < target->sg_tablesize) {
5cfb1782 3006 pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 3007 target->sg_tablesize = target->cmd_sg_cnt;
3008 }
3009
3010 target_host->sg_tablesize = target->sg_tablesize;
3011 target->indirect_size = target->sg_tablesize *
3012 sizeof (struct srp_direct_buf);
49248644
DD		 3013 target->max_iu_len = sizeof (struct srp_cmd) +
3014 sizeof (struct srp_indirect_buf) +
3015 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
3016
c1120f89 3017 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 3018 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 3019 spin_lock_init(&target->lock);
3020 INIT_LIST_HEAD(&target->free_tx);
b81d00bd
BVA		 3021 ret = srp_alloc_req_data(target);
3022 if (ret)
3023 goto err_free_mem;
8f26c9ff 3024
2088ca66
SG		 3025 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
3026 if (ret)
3027 goto err_free_mem;
aef9ec39 3028
aef9ec39
RD		 3029 ret = srp_create_target_ib(target);
3030 if (ret)
8f26c9ff 3031 goto err_free_mem;
aef9ec39 3032
9fe4bcf4
DD		 3033 ret = srp_new_cm_id(target);
3034 if (ret)
8f26c9ff 3035 goto err_free_ib;
aef9ec39
RD		 3036
3037 ret = srp_connect_target(target);
3038 if (ret) {
7aa54bd7
DD		 3039 shost_printk(KERN_ERR, target->scsi_host,
3040 PFX "Connection failed\n");
aef9ec39
RD		 3041 goto err_cm_id;
3042 }
3043
3044 ret = srp_add_target(host, target);
3045 if (ret)
3046 goto err_disconnect;
3047
e7ffde01
BVA		 3048 shost_printk(KERN_DEBUG, target->scsi_host, PFX
3049 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
3050 be64_to_cpu(target->id_ext),
3051 be64_to_cpu(target->ioc_guid),
3052 be16_to_cpu(target->path.pkey),
3053 be64_to_cpu(target->service_id),
3054 target->path.sgid.raw, target->path.dgid.raw);
3055
2d7091bc
BVA		 3056 ret = count;
3057
3058out:
3059 mutex_unlock(&host->add_target_mutex);
3060 return ret;
aef9ec39
RD		 3061
3062err_disconnect:
3063 srp_disconnect_target(target);
3064
3065err_cm_id:
3066 ib_destroy_cm_id(target->cm_id);
3067
8f26c9ff 3068err_free_ib:
aef9ec39
RD		 3069 srp_free_target_ib(target);
3070
8f26c9ff
DD		 3071err_free_mem:
3072 srp_free_req_data(target);
3073
aef9ec39
RD		 3074err:
3075 scsi_host_put(target_host);
2d7091bc 3076 goto out;
aef9ec39
RD		 3077}
3078
ee959b00 3079static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 3080
ee959b00
TJ		 3081static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
3082 char *buf)
aef9ec39 3083{
ee959b00 3084 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 3085
05321937 3086 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 3087}
3088
ee959b00 3089static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 3090
ee959b00
TJ		 3091static ssize_t show_port(struct device *dev, struct device_attribute *attr,
3092 char *buf)
aef9ec39 3093{
ee959b00 3094 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 3095
3096 return sprintf(buf, "%d\n", host->port);
3097}
3098
ee959b00 3099static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 3100
f5358a17 3101static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 3102{
3103 struct srp_host *host;
3104
3105 host = kzalloc(sizeof *host, GFP_KERNEL);
3106 if (!host)
3107 return NULL;
3108
3109 INIT_LIST_HEAD(&host->target_list);
b3589fd4 3110 spin_lock_init(&host->target_lock);
aef9ec39 3111 init_completion(&host->released);
2d7091bc 3112 mutex_init(&host->add_target_mutex);
05321937 3113 host->srp_dev = device;
aef9ec39
RD		 3114 host->port = port;
3115
ee959b00
TJ		 3116 host->dev.class = &srp_class;
3117 host->dev.parent = device->dev->dma_device;
d927e38c 3118 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 3119
ee959b00 3120 if (device_register(&host->dev))
f5358a17 3121 goto free_host;
ee959b00 3122 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 3123 goto err_class;
ee959b00 3124 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 3125 goto err_class;
ee959b00 3126 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 3127 goto err_class;
3128
3129 return host;
3130
3131err_class:
ee959b00 3132 device_unregister(&host->dev);
aef9ec39 3133
f5358a17 3134free_host:
aef9ec39
RD		 3135 kfree(host);
3136
3137 return NULL;
3138}
3139
3140static void srp_add_one(struct ib_device *device)
3141{
f5358a17
RD		 3142 struct srp_device *srp_dev;
3143 struct ib_device_attr *dev_attr;
aef9ec39 3144 struct srp_host *host;
52ede08f
BVA		 3145 int mr_page_shift, s, e, p;
3146 u64 max_pages_per_mr;
aef9ec39 3147
f5358a17
RD		 3148 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
3149 if (!dev_attr)
cf311cd4 3150 return;
aef9ec39 3151
f5358a17 3152 if (ib_query_device(device, dev_attr)) {
e0bda7d8 3153 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 3154 goto free_attr;
3155 }
3156
3157 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
3158 if (!srp_dev)
3159 goto free_attr;
3160
d1b4289e
BVA		 3161 srp_dev->has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
3162 device->map_phys_fmr && device->unmap_fmr);
5cfb1782
BVA		 3163 srp_dev->has_fr = (dev_attr->device_cap_flags &
3164 IB_DEVICE_MEM_MGT_EXTENSIONS);
3165 if (!srp_dev->has_fmr && !srp_dev->has_fr)
3166 dev_warn(&device->dev, "neither FMR nor FR is supported\n");
3167
3168 srp_dev->use_fast_reg = (srp_dev->has_fr &&
3169 (!srp_dev->has_fmr || prefer_fr));
d1b4289e 3170
f5358a17
RD		 3171 /*
3172 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 3173 * minimum of 4096 bytes. We're unlikely to build large sglists
3174 * out of smaller entries.
f5358a17 3175 */
52ede08f
BVA		 3176 mr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
3177 srp_dev->mr_page_size = 1 << mr_page_shift;
3178 srp_dev->mr_page_mask = ~((u64) srp_dev->mr_page_size - 1);
3179 max_pages_per_mr = dev_attr->max_mr_size;
3180 do_div(max_pages_per_mr, srp_dev->mr_page_size);
3181 srp_dev->max_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR,
3182 max_pages_per_mr);
5cfb1782
BVA		 3183 if (srp_dev->use_fast_reg) {
3184 srp_dev->max_pages_per_mr =
3185 min_t(u32, srp_dev->max_pages_per_mr,
3186 dev_attr->max_fast_reg_page_list_len);
3187 }
52ede08f
BVA		 3188 srp_dev->mr_max_size = srp_dev->mr_page_size *
3189 srp_dev->max_pages_per_mr;
5cfb1782 3190 pr_debug("%s: mr_page_shift = %d, dev_attr->max_mr_size = %#llx, dev_attr->max_fast_reg_page_list_len = %u, max_pages_per_mr = %d, mr_max_size = %#x\n",
52ede08f 3191 device->name, mr_page_shift, dev_attr->max_mr_size,
5cfb1782 3192 dev_attr->max_fast_reg_page_list_len,
52ede08f 3193 srp_dev->max_pages_per_mr, srp_dev->mr_max_size);
f5358a17
RD		 3194
3195 INIT_LIST_HEAD(&srp_dev->dev_list);
3196
3197 srp_dev->dev = device;
3198 srp_dev->pd = ib_alloc_pd(device);
3199 if (IS_ERR(srp_dev->pd))
3200 goto free_dev;
3201
3202 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
3203 IB_ACCESS_LOCAL_WRITE |
3204 IB_ACCESS_REMOTE_READ |
3205 IB_ACCESS_REMOTE_WRITE);
3206 if (IS_ERR(srp_dev->mr))
3207 goto err_pd;
3208
07ebafba 3209 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 3210 s = 0;
3211 e = 0;
3212 } else {
3213 s = 1;
3214 e = device->phys_port_cnt;
3215 }
3216
3217 for (p = s; p <= e; ++p) {
f5358a17 3218 host = srp_add_port(srp_dev, p);
aef9ec39 3219 if (host)
f5358a17 3220 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 3221 }
3222
f5358a17
RD		 3223 ib_set_client_data(device, &srp_client, srp_dev);
3224
3225 goto free_attr;
3226
3227err_pd:
3228 ib_dealloc_pd(srp_dev->pd);
3229
3230free_dev:
3231 kfree(srp_dev);
3232
3233free_attr:
3234 kfree(dev_attr);
aef9ec39
RD		 3235}
3236
3237static void srp_remove_one(struct ib_device *device)
3238{
f5358a17 3239 struct srp_device *srp_dev;
aef9ec39 3240 struct srp_host *host, *tmp_host;
ef6c49d8 3241 struct srp_target_port *target;
aef9ec39 3242
f5358a17 3243 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 3244 if (!srp_dev)
3245 return;
aef9ec39 3246
f5358a17 3247 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 3248 device_unregister(&host->dev);
aef9ec39
RD		 3249 /*
3250 * Wait for the sysfs entry to go away, so that no new
3251 * target ports can be created.
3252 */
3253 wait_for_completion(&host->released);
3254
3255 /*
ef6c49d8 3256 * Remove all target ports.
aef9ec39 3257 */
b3589fd4 3258 spin_lock(&host->target_lock);
ef6c49d8
BVA		 3259 list_for_each_entry(target, &host->target_list, list)
3260 srp_queue_remove_work(target);
b3589fd4 3261 spin_unlock(&host->target_lock);
aef9ec39
RD		 3262
3263 /*
ef6c49d8 3264 * Wait for target port removal tasks.
aef9ec39 3265 */
ef6c49d8 3266 flush_workqueue(system_long_wq);
aef9ec39 3267
aef9ec39
RD		 3268 kfree(host);
3269 }
3270
f5358a17
RD		 3271 ib_dereg_mr(srp_dev->mr);
3272 ib_dealloc_pd(srp_dev->pd);
3273
3274 kfree(srp_dev);
aef9ec39
RD		 3275}
3276
3236822b 3277static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 3278 .has_rport_state = true,
3279 .reset_timer_if_blocked = true,
a95cadb9 3280 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 3281 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
3282 .dev_loss_tmo = &srp_dev_loss_tmo,
3283 .reconnect = srp_rport_reconnect,
dc1bdbd9 3284 .rport_delete = srp_rport_delete,
ed9b2264 3285 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 3286};
3287
aef9ec39
RD		 3288static int __init srp_init_module(void)
3289{
3290 int ret;
3291
dcb4cb85 3292 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 3293
49248644 3294 if (srp_sg_tablesize) {
e0bda7d8 3295 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 3296 if (!cmd_sg_entries)
3297 cmd_sg_entries = srp_sg_tablesize;
3298 }
3299
3300 if (!cmd_sg_entries)
3301 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
3302
3303 if (cmd_sg_entries > 255) {
e0bda7d8 3304 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 3305 cmd_sg_entries = 255;
1e89a194
DD		 3306 }
3307
c07d424d
DD		 3308 if (!indirect_sg_entries)
3309 indirect_sg_entries = cmd_sg_entries;
3310 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 3311 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
3312 cmd_sg_entries);
c07d424d
DD		 3313 indirect_sg_entries = cmd_sg_entries;
3314 }
3315
3236822b
FT		 3316 ib_srp_transport_template =
3317 srp_attach_transport(&ib_srp_transport_functions);
3318 if (!ib_srp_transport_template)
3319 return -ENOMEM;
3320
aef9ec39
RD		 3321 ret = class_register(&srp_class);
3322 if (ret) {
e0bda7d8 3323 pr_err("couldn't register class infiniband_srp\n");
3236822b 3324 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 3325 return ret;
3326 }
3327
c1a0b23b
MT		 3328 ib_sa_register_client(&srp_sa_client);
3329
aef9ec39
RD		 3330 ret = ib_register_client(&srp_client);
3331 if (ret) {
e0bda7d8 3332 pr_err("couldn't register IB client\n");
3236822b 3333 srp_release_transport(ib_srp_transport_template);
c1a0b23b 3334 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 3335 class_unregister(&srp_class);
3336 return ret;
3337 }
3338
3339 return 0;
3340}
3341
3342static void __exit srp_cleanup_module(void)
3343{
3344 ib_unregister_client(&srp_client);
c1a0b23b 3345 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 3346 class_unregister(&srp_class);
3236822b 3347 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 3348}
3349
3350module_init(srp_init_module);
3351module_exit(srp_cleanup_module);
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