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IB/srp: Separate target and channel variables
[deliverable/linux.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
aef9ec39
RD		 31 */
32
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);
509c07bc
BVA		 128static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr);
129static void srp_send_completion(struct ib_cq *cq, void *ch_ptr);
aef9ec39
RD		 130static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
131
3236822b 132static struct scsi_transport_template *ib_srp_transport_template;
bcc05910 133static struct workqueue_struct *srp_remove_wq;
3236822b 134
aef9ec39
RD		 135static struct ib_client srp_client = {
136 .name = "srp",
137 .add = srp_add_one,
138 .remove = srp_remove_one
139};
140
c1a0b23b
MT		 141static struct ib_sa_client srp_sa_client;
142
ed9b2264
BVA		 143static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
144{
145 int tmo = *(int *)kp->arg;
146
147 if (tmo >= 0)
148 return sprintf(buffer, "%d", tmo);
149 else
150 return sprintf(buffer, "off");
151}
152
153static int srp_tmo_set(const char *val, const struct kernel_param *kp)
154{
155 int tmo, res;
156
157 if (strncmp(val, "off", 3) != 0) {
158 res = kstrtoint(val, 0, &tmo);
159 if (res)
160 goto out;
161 } else {
162 tmo = -1;
163 }
a95cadb9
BVA		 164 if (kp->arg == &srp_reconnect_delay)
165 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
166 srp_dev_loss_tmo);
167 else if (kp->arg == &srp_fast_io_fail_tmo)
168 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
ed9b2264 169 else
a95cadb9
BVA		 170 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
171 tmo);
ed9b2264
BVA		 172 if (res)
173 goto out;
174 *(int *)kp->arg = tmo;
175
176out:
177 return res;
178}
179
180static struct kernel_param_ops srp_tmo_ops = {
181 .get = srp_tmo_get,
182 .set = srp_tmo_set,
183};
184
aef9ec39
RD		 185static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
186{
187 return (struct srp_target_port *) host->hostdata;
188}
189
190static const char *srp_target_info(struct Scsi_Host *host)
191{
192 return host_to_target(host)->target_name;
193}
194
5d7cbfd6
RD		 195static int srp_target_is_topspin(struct srp_target_port *target)
196{
197 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 198 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 199
200 return topspin_workarounds &&
3d1ff48d
RK		 201 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
202 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 203}
204
aef9ec39
RD		 205static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
206 gfp_t gfp_mask,
207 enum dma_data_direction direction)
208{
209 struct srp_iu *iu;
210
211 iu = kmalloc(sizeof *iu, gfp_mask);
212 if (!iu)
213 goto out;
214
215 iu->buf = kzalloc(size, gfp_mask);
216 if (!iu->buf)
217 goto out_free_iu;
218
05321937
GKH		 219 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
220 direction);
221 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 222 goto out_free_buf;
223
224 iu->size = size;
225 iu->direction = direction;
226
227 return iu;
228
229out_free_buf:
230 kfree(iu->buf);
231out_free_iu:
232 kfree(iu);
233out:
234 return NULL;
235}
236
237static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
238{
239 if (!iu)
240 return;
241
05321937
GKH		 242 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
243 iu->direction);
aef9ec39
RD		 244 kfree(iu->buf);
245 kfree(iu);
246}
247
248static void srp_qp_event(struct ib_event *event, void *context)
249{
e0bda7d8 250 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 251}
252
253static int srp_init_qp(struct srp_target_port *target,
254 struct ib_qp *qp)
255{
256 struct ib_qp_attr *attr;
257 int ret;
258
259 attr = kmalloc(sizeof *attr, GFP_KERNEL);
260 if (!attr)
261 return -ENOMEM;
262
969a60f9
RD		 263 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
264 target->srp_host->port,
747fe000 265 be16_to_cpu(target->pkey),
969a60f9 266 &attr->pkey_index);
aef9ec39
RD		 267 if (ret)
268 goto out;
269
270 attr->qp_state = IB_QPS_INIT;
271 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
272 IB_ACCESS_REMOTE_WRITE);
273 attr->port_num = target->srp_host->port;
274
275 ret = ib_modify_qp(qp, attr,
276 IB_QP_STATE |
277 IB_QP_PKEY_INDEX |
278 IB_QP_ACCESS_FLAGS |
279 IB_QP_PORT);
280
281out:
282 kfree(attr);
283 return ret;
284}
285
509c07bc 286static int srp_new_cm_id(struct srp_rdma_ch *ch)
9fe4bcf4 287{
509c07bc 288 struct srp_target_port *target = ch->target;
9fe4bcf4
DD		 289 struct ib_cm_id *new_cm_id;
290
05321937 291 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
509c07bc 292 srp_cm_handler, ch);
9fe4bcf4
DD		 293 if (IS_ERR(new_cm_id))
294 return PTR_ERR(new_cm_id);
295
509c07bc
BVA		 296 if (ch->cm_id)
297 ib_destroy_cm_id(ch->cm_id);
298 ch->cm_id = new_cm_id;
299 ch->path.sgid = target->sgid;
300 ch->path.dgid = target->orig_dgid;
301 ch->path.pkey = target->pkey;
302 ch->path.service_id = target->service_id;
9fe4bcf4
DD		 303
304 return 0;
305}
306
d1b4289e
BVA		 307static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target)
308{
309 struct srp_device *dev = target->srp_host->srp_dev;
310 struct ib_fmr_pool_param fmr_param;
311
312 memset(&fmr_param, 0, sizeof(fmr_param));
313 fmr_param.pool_size = target->scsi_host->can_queue;
314 fmr_param.dirty_watermark = fmr_param.pool_size / 4;
315 fmr_param.cache = 1;
52ede08f
BVA		 316 fmr_param.max_pages_per_fmr = dev->max_pages_per_mr;
317 fmr_param.page_shift = ilog2(dev->mr_page_size);
d1b4289e
BVA		 318 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
319 IB_ACCESS_REMOTE_WRITE |
320 IB_ACCESS_REMOTE_READ);
321
322 return ib_create_fmr_pool(dev->pd, &fmr_param);
323}
324
5cfb1782
BVA		 325/**
326 * srp_destroy_fr_pool() - free the resources owned by a pool
327 * @pool: Fast registration pool to be destroyed.
328 */
329static void srp_destroy_fr_pool(struct srp_fr_pool *pool)
330{
331 int i;
332 struct srp_fr_desc *d;
333
334 if (!pool)
335 return;
336
337 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
338 if (d->frpl)
339 ib_free_fast_reg_page_list(d->frpl);
340 if (d->mr)
341 ib_dereg_mr(d->mr);
342 }
343 kfree(pool);
344}
345
346/**
347 * srp_create_fr_pool() - allocate and initialize a pool for fast registration
348 * @device: IB device to allocate fast registration descriptors for.
349 * @pd: Protection domain associated with the FR descriptors.
350 * @pool_size: Number of descriptors to allocate.
351 * @max_page_list_len: Maximum fast registration work request page list length.
352 */
353static struct srp_fr_pool *srp_create_fr_pool(struct ib_device *device,
354 struct ib_pd *pd, int pool_size,
355 int max_page_list_len)
356{
357 struct srp_fr_pool *pool;
358 struct srp_fr_desc *d;
359 struct ib_mr *mr;
360 struct ib_fast_reg_page_list *frpl;
361 int i, ret = -EINVAL;
362
363 if (pool_size <= 0)
364 goto err;
365 ret = -ENOMEM;
366 pool = kzalloc(sizeof(struct srp_fr_pool) +
367 pool_size * sizeof(struct srp_fr_desc), GFP_KERNEL);
368 if (!pool)
369 goto err;
370 pool->size = pool_size;
371 pool->max_page_list_len = max_page_list_len;
372 spin_lock_init(&pool->lock);
373 INIT_LIST_HEAD(&pool->free_list);
374
375 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
376 mr = ib_alloc_fast_reg_mr(pd, max_page_list_len);
377 if (IS_ERR(mr)) {
378 ret = PTR_ERR(mr);
379 goto destroy_pool;
380 }
381 d->mr = mr;
382 frpl = ib_alloc_fast_reg_page_list(device, max_page_list_len);
383 if (IS_ERR(frpl)) {
384 ret = PTR_ERR(frpl);
385 goto destroy_pool;
386 }
387 d->frpl = frpl;
388 list_add_tail(&d->entry, &pool->free_list);
389 }
390
391out:
392 return pool;
393
394destroy_pool:
395 srp_destroy_fr_pool(pool);
396
397err:
398 pool = ERR_PTR(ret);
399 goto out;
400}
401
402/**
403 * srp_fr_pool_get() - obtain a descriptor suitable for fast registration
404 * @pool: Pool to obtain descriptor from.
405 */
406static struct srp_fr_desc *srp_fr_pool_get(struct srp_fr_pool *pool)
407{
408 struct srp_fr_desc *d = NULL;
409 unsigned long flags;
410
411 spin_lock_irqsave(&pool->lock, flags);
412 if (!list_empty(&pool->free_list)) {
413 d = list_first_entry(&pool->free_list, typeof(*d), entry);
414 list_del(&d->entry);
415 }
416 spin_unlock_irqrestore(&pool->lock, flags);
417
418 return d;
419}
420
421/**
422 * srp_fr_pool_put() - put an FR descriptor back in the free list
423 * @pool: Pool the descriptor was allocated from.
424 * @desc: Pointer to an array of fast registration descriptor pointers.
425 * @n: Number of descriptors to put back.
426 *
427 * Note: The caller must already have queued an invalidation request for
428 * desc->mr->rkey before calling this function.
429 */
430static void srp_fr_pool_put(struct srp_fr_pool *pool, struct srp_fr_desc **desc,
431 int n)
432{
433 unsigned long flags;
434 int i;
435
436 spin_lock_irqsave(&pool->lock, flags);
437 for (i = 0; i < n; i++)
438 list_add(&desc[i]->entry, &pool->free_list);
439 spin_unlock_irqrestore(&pool->lock, flags);
440}
441
442static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target)
443{
444 struct srp_device *dev = target->srp_host->srp_dev;
445
446 return srp_create_fr_pool(dev->dev, dev->pd,
447 target->scsi_host->can_queue,
448 dev->max_pages_per_mr);
449}
450
509c07bc 451static int srp_create_ch_ib(struct srp_rdma_ch *ch)
aef9ec39 452{
509c07bc 453 struct srp_target_port *target = ch->target;
62154b2e 454 struct srp_device *dev = target->srp_host->srp_dev;
aef9ec39 455 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 456 struct ib_cq *recv_cq, *send_cq;
457 struct ib_qp *qp;
d1b4289e 458 struct ib_fmr_pool *fmr_pool = NULL;
5cfb1782
BVA		 459 struct srp_fr_pool *fr_pool = NULL;
460 const int m = 1 + dev->use_fast_reg;
aef9ec39
RD		 461 int ret;
462
463 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
464 if (!init_attr)
465 return -ENOMEM;
466
509c07bc
BVA		 467 recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, ch,
468 target->queue_size, ch->comp_vector);
73aa89ed
IR		 469 if (IS_ERR(recv_cq)) {
470 ret = PTR_ERR(recv_cq);
da9d2f07 471 goto err;
aef9ec39
RD		 472 }
473
509c07bc
BVA		 474 send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, ch,
475 m * target->queue_size, ch->comp_vector);
73aa89ed
IR		 476 if (IS_ERR(send_cq)) {
477 ret = PTR_ERR(send_cq);
da9d2f07 478 goto err_recv_cq;
9c03dc9f
BVA		 479 }
480
73aa89ed 481 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 482
483 init_attr->event_handler = srp_qp_event;
5cfb1782 484 init_attr->cap.max_send_wr = m * target->queue_size;
4d73f95f 485 init_attr->cap.max_recv_wr = target->queue_size;
aef9ec39
RD		 486 init_attr->cap.max_recv_sge = 1;
487 init_attr->cap.max_send_sge = 1;
5cfb1782 488 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
aef9ec39 489 init_attr->qp_type = IB_QPT_RC;
73aa89ed
IR		 490 init_attr->send_cq = send_cq;
491 init_attr->recv_cq = recv_cq;
aef9ec39 492
62154b2e 493 qp = ib_create_qp(dev->pd, init_attr);
73aa89ed
IR		 494 if (IS_ERR(qp)) {
495 ret = PTR_ERR(qp);
da9d2f07 496 goto err_send_cq;
aef9ec39
RD		 497 }
498
73aa89ed 499 ret = srp_init_qp(target, qp);
da9d2f07
RD		 500 if (ret)
501 goto err_qp;
aef9ec39 502
5cfb1782
BVA		 503 if (dev->use_fast_reg && dev->has_fr) {
504 fr_pool = srp_alloc_fr_pool(target);
505 if (IS_ERR(fr_pool)) {
506 ret = PTR_ERR(fr_pool);
507 shost_printk(KERN_WARNING, target->scsi_host, PFX
508 "FR pool allocation failed (%d)\n", ret);
509 goto err_qp;
510 }
509c07bc
BVA		 511 if (ch->fr_pool)
512 srp_destroy_fr_pool(ch->fr_pool);
513 ch->fr_pool = fr_pool;
5cfb1782 514 } else if (!dev->use_fast_reg && dev->has_fmr) {
d1b4289e
BVA		 515 fmr_pool = srp_alloc_fmr_pool(target);
516 if (IS_ERR(fmr_pool)) {
517 ret = PTR_ERR(fmr_pool);
518 shost_printk(KERN_WARNING, target->scsi_host, PFX
519 "FMR pool allocation failed (%d)\n", ret);
520 goto err_qp;
521 }
509c07bc
BVA		 522 if (ch->fmr_pool)
523 ib_destroy_fmr_pool(ch->fmr_pool);
524 ch->fmr_pool = fmr_pool;
d1b4289e
BVA		 525 }
526
509c07bc
BVA		 527 if (ch->qp)
528 ib_destroy_qp(ch->qp);
529 if (ch->recv_cq)
530 ib_destroy_cq(ch->recv_cq);
531 if (ch->send_cq)
532 ib_destroy_cq(ch->send_cq);
73aa89ed 533
509c07bc
BVA		 534 ch->qp = qp;
535 ch->recv_cq = recv_cq;
536 ch->send_cq = send_cq;
73aa89ed 537
da9d2f07
RD		 538 kfree(init_attr);
539 return 0;
540
541err_qp:
73aa89ed 542 ib_destroy_qp(qp);
da9d2f07
RD		 543
544err_send_cq:
73aa89ed 545 ib_destroy_cq(send_cq);
da9d2f07
RD		 546
547err_recv_cq:
73aa89ed 548 ib_destroy_cq(recv_cq);
da9d2f07
RD		 549
550err:
aef9ec39
RD		 551 kfree(init_attr);
552 return ret;
553}
554
4d73f95f
BVA		 555/*
556 * Note: this function may be called without srp_alloc_iu_bufs() having been
509c07bc 557 * invoked. Hence the ch->[rt]x_ring checks.
4d73f95f 558 */
509c07bc
BVA		 559static void srp_free_ch_ib(struct srp_target_port *target,
560 struct srp_rdma_ch *ch)
aef9ec39 561{
5cfb1782 562 struct srp_device *dev = target->srp_host->srp_dev;
aef9ec39
RD		 563 int i;
564
509c07bc
BVA		 565 if (ch->cm_id) {
566 ib_destroy_cm_id(ch->cm_id);
567 ch->cm_id = NULL;
394c595e
BVA		 568 }
569
5cfb1782 570 if (dev->use_fast_reg) {
509c07bc
BVA		 571 if (ch->fr_pool)
572 srp_destroy_fr_pool(ch->fr_pool);
5cfb1782 573 } else {
509c07bc
BVA		 574 if (ch->fmr_pool)
575 ib_destroy_fmr_pool(ch->fmr_pool);
5cfb1782 576 }
509c07bc
BVA		 577 ib_destroy_qp(ch->qp);
578 ib_destroy_cq(ch->send_cq);
579 ib_destroy_cq(ch->recv_cq);
aef9ec39 580
509c07bc
BVA		 581 ch->qp = NULL;
582 ch->send_cq = ch->recv_cq = NULL;
73aa89ed 583
509c07bc 584 if (ch->rx_ring) {
4d73f95f 585 for (i = 0; i < target->queue_size; ++i)
509c07bc
BVA		 586 srp_free_iu(target->srp_host, ch->rx_ring[i]);
587 kfree(ch->rx_ring);
588 ch->rx_ring = NULL;
4d73f95f 589 }
509c07bc 590 if (ch->tx_ring) {
4d73f95f 591 for (i = 0; i < target->queue_size; ++i)
509c07bc
BVA		 592 srp_free_iu(target->srp_host, ch->tx_ring[i]);
593 kfree(ch->tx_ring);
594 ch->tx_ring = NULL;
4d73f95f 595 }
aef9ec39
RD		 596}
597
598static void srp_path_rec_completion(int status,
599 struct ib_sa_path_rec *pathrec,
509c07bc 600 void *ch_ptr)
aef9ec39 601{
509c07bc
BVA		 602 struct srp_rdma_ch *ch = ch_ptr;
603 struct srp_target_port *target = ch->target;
aef9ec39 604
509c07bc 605 ch->status = status;
aef9ec39 606 if (status)
7aa54bd7
DD		 607 shost_printk(KERN_ERR, target->scsi_host,
608 PFX "Got failed path rec status %d\n", status);
aef9ec39 609 else
509c07bc
BVA		 610 ch->path = *pathrec;
611 complete(&ch->done);
aef9ec39
RD		 612}
613
509c07bc 614static int srp_lookup_path(struct srp_rdma_ch *ch)
aef9ec39 615{
509c07bc 616 struct srp_target_port *target = ch->target;
a702adce
BVA		 617 int ret;
618
509c07bc
BVA		 619 ch->path.numb_path = 1;
620
621 init_completion(&ch->done);
622
623 ch->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
624 target->srp_host->srp_dev->dev,
625 target->srp_host->port,
626 &ch->path,
627 IB_SA_PATH_REC_SERVICE_ID |
628 IB_SA_PATH_REC_DGID |
629 IB_SA_PATH_REC_SGID |
630 IB_SA_PATH_REC_NUMB_PATH |
631 IB_SA_PATH_REC_PKEY,
632 SRP_PATH_REC_TIMEOUT_MS,
633 GFP_KERNEL,
634 srp_path_rec_completion,
635 ch, &ch->path_query);
636 if (ch->path_query_id < 0)
637 return ch->path_query_id;
638
639 ret = wait_for_completion_interruptible(&ch->done);
a702adce
BVA		 640 if (ret < 0)
641 return ret;
aef9ec39 642
509c07bc 643 if (ch->status < 0)
7aa54bd7
DD		 644 shost_printk(KERN_WARNING, target->scsi_host,
645 PFX "Path record query failed\n");
aef9ec39 646
509c07bc 647 return ch->status;
aef9ec39
RD		 648}
649
509c07bc 650static int srp_send_req(struct srp_rdma_ch *ch)
aef9ec39 651{
509c07bc 652 struct srp_target_port *target = ch->target;
aef9ec39
RD		 653 struct {
654 struct ib_cm_req_param param;
655 struct srp_login_req priv;
656 } *req = NULL;
657 int status;
658
659 req = kzalloc(sizeof *req, GFP_KERNEL);
660 if (!req)
661 return -ENOMEM;
662
509c07bc 663 req->param.primary_path = &ch->path;
aef9ec39
RD		 664 req->param.alternate_path = NULL;
665 req->param.service_id = target->service_id;
509c07bc
BVA		 666 req->param.qp_num = ch->qp->qp_num;
667 req->param.qp_type = ch->qp->qp_type;
aef9ec39
RD		 668 req->param.private_data = &req->priv;
669 req->param.private_data_len = sizeof req->priv;
670 req->param.flow_control = 1;
671
672 get_random_bytes(&req->param.starting_psn, 4);
673 req->param.starting_psn &= 0xffffff;
674
675 /*
676 * Pick some arbitrary defaults here; we could make these
677 * module parameters if anyone cared about setting them.
678 */
679 req->param.responder_resources = 4;
680 req->param.remote_cm_response_timeout = 20;
681 req->param.local_cm_response_timeout = 20;
7bb312e4 682 req->param.retry_count = target->tl_retry_count;
aef9ec39
RD		 683 req->param.rnr_retry_count = 7;
684 req->param.max_cm_retries = 15;
685
686 req->priv.opcode = SRP_LOGIN_REQ;
687 req->priv.tag = 0;
49248644 688 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 689 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
690 SRP_BUF_FORMAT_INDIRECT);
0c0450db 691 /*
3cd96564 692 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 693 * port identifier format is 8 bytes of ID extension followed
694 * by 8 bytes of GUID. Older drafts put the two halves in the
695 * opposite order, so that the GUID comes first.
696 *
697 * Targets conforming to these obsolete drafts can be
698 * recognized by the I/O Class they report.
699 */
700 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
701 memcpy(req->priv.initiator_port_id,
747fe000 702 &target->sgid.global.interface_id, 8);
0c0450db 703 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 704 &target->initiator_ext, 8);
0c0450db
R		 705 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
706 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
707 } else {
708 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 709 &target->initiator_ext, 8);
710 memcpy(req->priv.initiator_port_id + 8,
747fe000 711 &target->sgid.global.interface_id, 8);
0c0450db
R		 712 memcpy(req->priv.target_port_id, &target->id_ext, 8);
713 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
714 }
715
aef9ec39
RD		 716 /*
717 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 718 * zero out the first 8 bytes of our initiator port ID and set
719 * the second 8 bytes to the local node GUID.
aef9ec39 720 */
5d7cbfd6 721 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 722 shost_printk(KERN_DEBUG, target->scsi_host,
723 PFX "Topspin/Cisco initiator port ID workaround "
724 "activated for target GUID %016llx\n",
725 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 726 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 727 memcpy(req->priv.initiator_port_id + 8,
05321937 728 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 729 }
aef9ec39 730
509c07bc 731 status = ib_send_cm_req(ch->cm_id, &req->param);
aef9ec39
RD		 732
733 kfree(req);
734
735 return status;
736}
737
ef6c49d8
BVA		 738static bool srp_queue_remove_work(struct srp_target_port *target)
739{
740 bool changed = false;
741
742 spin_lock_irq(&target->lock);
743 if (target->state != SRP_TARGET_REMOVED) {
744 target->state = SRP_TARGET_REMOVED;
745 changed = true;
746 }
747 spin_unlock_irq(&target->lock);
748
749 if (changed)
bcc05910 750 queue_work(srp_remove_wq, &target->remove_work);
ef6c49d8
BVA		 751
752 return changed;
753}
754
294c875a
BVA		 755static bool srp_change_conn_state(struct srp_target_port *target,
756 bool connected)
757{
758 bool changed = false;
759
760 spin_lock_irq(&target->lock);
761 if (target->connected != connected) {
762 target->connected = connected;
763 changed = true;
764 }
765 spin_unlock_irq(&target->lock);
766
767 return changed;
768}
769
aef9ec39
RD		 770static void srp_disconnect_target(struct srp_target_port *target)
771{
509c07bc
BVA		 772 struct srp_rdma_ch *ch = &target->ch;
773
294c875a
BVA		 774 if (srp_change_conn_state(target, false)) {
775 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 776
509c07bc 777 if (ib_send_cm_dreq(ch->cm_id, NULL, 0)) {
294c875a
BVA		 778 shost_printk(KERN_DEBUG, target->scsi_host,
779 PFX "Sending CM DREQ failed\n");
294c875a 780 }
e6581056 781 }
aef9ec39
RD		 782}
783
509c07bc
BVA		 784static void srp_free_req_data(struct srp_target_port *target,
785 struct srp_rdma_ch *ch)
8f26c9ff 786{
5cfb1782
BVA		 787 struct srp_device *dev = target->srp_host->srp_dev;
788 struct ib_device *ibdev = dev->dev;
8f26c9ff
DD		 789 struct srp_request *req;
790 int i;
791
509c07bc 792 if (!ch->req_ring)
4d73f95f
BVA		 793 return;
794
795 for (i = 0; i < target->req_ring_size; ++i) {
509c07bc 796 req = &ch->req_ring[i];
5cfb1782
BVA		 797 if (dev->use_fast_reg)
798 kfree(req->fr_list);
799 else
800 kfree(req->fmr_list);
8f26c9ff 801 kfree(req->map_page);
c07d424d
DD		 802 if (req->indirect_dma_addr) {
803 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
804 target->indirect_size,
805 DMA_TO_DEVICE);
806 }
807 kfree(req->indirect_desc);
8f26c9ff 808 }
4d73f95f 809
509c07bc
BVA		 810 kfree(ch->req_ring);
811 ch->req_ring = NULL;
8f26c9ff
DD		 812}
813
509c07bc 814static int srp_alloc_req_data(struct srp_rdma_ch *ch)
b81d00bd 815{
509c07bc 816 struct srp_target_port *target = ch->target;
b81d00bd
BVA		 817 struct srp_device *srp_dev = target->srp_host->srp_dev;
818 struct ib_device *ibdev = srp_dev->dev;
819 struct srp_request *req;
5cfb1782 820 void *mr_list;
b81d00bd
BVA		 821 dma_addr_t dma_addr;
822 int i, ret = -ENOMEM;
823
509c07bc 824 INIT_LIST_HEAD(&ch->free_reqs);
b81d00bd 825
509c07bc
BVA		 826 ch->req_ring = kcalloc(target->req_ring_size, sizeof(*ch->req_ring),
827 GFP_KERNEL);
828 if (!ch->req_ring)
4d73f95f
BVA		 829 goto out;
830
831 for (i = 0; i < target->req_ring_size; ++i) {
509c07bc 832 req = &ch->req_ring[i];
5cfb1782
BVA		 833 mr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
834 GFP_KERNEL);
835 if (!mr_list)
836 goto out;
837 if (srp_dev->use_fast_reg)
838 req->fr_list = mr_list;
839 else
840 req->fmr_list = mr_list;
52ede08f 841 req->map_page = kmalloc(srp_dev->max_pages_per_mr *
d1b4289e 842 sizeof(void *), GFP_KERNEL);
5cfb1782
BVA		 843 if (!req->map_page)
844 goto out;
b81d00bd 845 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
5cfb1782 846 if (!req->indirect_desc)
b81d00bd
BVA		 847 goto out;
848
849 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
850 target->indirect_size,
851 DMA_TO_DEVICE);
852 if (ib_dma_mapping_error(ibdev, dma_addr))
853 goto out;
854
855 req->indirect_dma_addr = dma_addr;
856 req->index = i;
509c07bc 857 list_add_tail(&req->list, &ch->free_reqs);
b81d00bd
BVA		 858 }
859 ret = 0;
860
861out:
862 return ret;
863}
864
683b159a
BVA		 865/**
866 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
867 * @shost: SCSI host whose attributes to remove from sysfs.
868 *
869 * Note: Any attributes defined in the host template and that did not exist
870 * before invocation of this function will be ignored.
871 */
872static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
873{
874 struct device_attribute **attr;
875
876 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
877 device_remove_file(&shost->shost_dev, *attr);
878}
879
ee12d6a8
BVA		 880static void srp_remove_target(struct srp_target_port *target)
881{
509c07bc
BVA		 882 struct srp_rdma_ch *ch = &target->ch;
883
ef6c49d8
BVA		 884 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
885
ee12d6a8 886 srp_del_scsi_host_attr(target->scsi_host);
9dd69a60 887 srp_rport_get(target->rport);
ee12d6a8
BVA		 888 srp_remove_host(target->scsi_host);
889 scsi_remove_host(target->scsi_host);
93079162 890 srp_stop_rport_timers(target->rport);
ef6c49d8 891 srp_disconnect_target(target);
509c07bc 892 srp_free_ch_ib(target, ch);
c1120f89 893 cancel_work_sync(&target->tl_err_work);
9dd69a60 894 srp_rport_put(target->rport);
509c07bc 895 srp_free_req_data(target, ch);
65d7dd2f
VP		 896
897 spin_lock(&target->srp_host->target_lock);
898 list_del(&target->list);
899 spin_unlock(&target->srp_host->target_lock);
900
ee12d6a8
BVA		 901 scsi_host_put(target->scsi_host);
902}
903
c4028958 904static void srp_remove_work(struct work_struct *work)
aef9ec39 905{
c4028958 906 struct srp_target_port *target =
ef6c49d8 907 container_of(work, struct srp_target_port, remove_work);
aef9ec39 908
ef6c49d8 909 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 910
96fc248a 911 srp_remove_target(target);
aef9ec39
RD		 912}
913
dc1bdbd9
BVA		 914static void srp_rport_delete(struct srp_rport *rport)
915{
916 struct srp_target_port *target = rport->lld_data;
917
918 srp_queue_remove_work(target);
919}
920
509c07bc 921static int srp_connect_ch(struct srp_rdma_ch *ch)
aef9ec39 922{
509c07bc 923 struct srp_target_port *target = ch->target;
aef9ec39
RD		 924 int ret;
925
294c875a
BVA		 926 WARN_ON_ONCE(target->connected);
927
948d1e88
BVA		 928 target->qp_in_error = false;
929
509c07bc 930 ret = srp_lookup_path(ch);
aef9ec39
RD		 931 if (ret)
932 return ret;
933
934 while (1) {
509c07bc
BVA		 935 init_completion(&ch->done);
936 ret = srp_send_req(ch);
aef9ec39
RD		 937 if (ret)
938 return ret;
509c07bc 939 ret = wait_for_completion_interruptible(&ch->done);
a702adce
BVA		 940 if (ret < 0)
941 return ret;
aef9ec39
RD		 942
943 /*
944 * The CM event handling code will set status to
945 * SRP_PORT_REDIRECT if we get a port redirect REJ
946 * back, or SRP_DLID_REDIRECT if we get a lid/qp
947 * redirect REJ back.
948 */
509c07bc 949 switch (ch->status) {
aef9ec39 950 case 0:
294c875a 951 srp_change_conn_state(target, true);
aef9ec39
RD		 952 return 0;
953
954 case SRP_PORT_REDIRECT:
509c07bc 955 ret = srp_lookup_path(ch);
aef9ec39
RD		 956 if (ret)
957 return ret;
958 break;
959
960 case SRP_DLID_REDIRECT:
961 break;
962
9fe4bcf4 963 case SRP_STALE_CONN:
9fe4bcf4 964 shost_printk(KERN_ERR, target->scsi_host, PFX
205619f2 965 "giving up on stale connection\n");
509c07bc
BVA		 966 ch->status = -ECONNRESET;
967 return ch->status;
9fe4bcf4 968
aef9ec39 969 default:
509c07bc 970 return ch->status;
aef9ec39
RD		 971 }
972 }
973}
974
509c07bc 975static int srp_inv_rkey(struct srp_rdma_ch *ch, u32 rkey)
5cfb1782
BVA		 976{
977 struct ib_send_wr *bad_wr;
978 struct ib_send_wr wr = {
979 .opcode = IB_WR_LOCAL_INV,
980 .wr_id = LOCAL_INV_WR_ID_MASK,
981 .next = NULL,
982 .num_sge = 0,
983 .send_flags = 0,
984 .ex.invalidate_rkey = rkey,
985 };
986
509c07bc 987 return ib_post_send(ch->qp, &wr, &bad_wr);
5cfb1782
BVA		 988}
989
d945e1df 990static void srp_unmap_data(struct scsi_cmnd *scmnd,
509c07bc 991 struct srp_rdma_ch *ch,
d945e1df
RD		 992 struct srp_request *req)
993{
509c07bc 994 struct srp_target_port *target = ch->target;
5cfb1782
BVA		 995 struct srp_device *dev = target->srp_host->srp_dev;
996 struct ib_device *ibdev = dev->dev;
997 int i, res;
8f26c9ff 998
bb350d1d 999 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 1000 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
1001 scmnd->sc_data_direction != DMA_FROM_DEVICE))
1002 return;
1003
5cfb1782
BVA		 1004 if (dev->use_fast_reg) {
1005 struct srp_fr_desc **pfr;
1006
1007 for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) {
509c07bc 1008 res = srp_inv_rkey(ch, (*pfr)->mr->rkey);
5cfb1782
BVA		 1009 if (res < 0) {
1010 shost_printk(KERN_ERR, target->scsi_host, PFX
1011 "Queueing INV WR for rkey %#x failed (%d)\n",
1012 (*pfr)->mr->rkey, res);
1013 queue_work(system_long_wq,
1014 &target->tl_err_work);
1015 }
1016 }
1017 if (req->nmdesc)
509c07bc 1018 srp_fr_pool_put(ch->fr_pool, req->fr_list,
5cfb1782
BVA		 1019 req->nmdesc);
1020 } else {
1021 struct ib_pool_fmr **pfmr;
1022
1023 for (i = req->nmdesc, pfmr = req->fmr_list; i > 0; i--, pfmr++)
1024 ib_fmr_pool_unmap(*pfmr);
1025 }
f5358a17 1026
8f26c9ff
DD		 1027 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
1028 scmnd->sc_data_direction);
d945e1df
RD		 1029}
1030
22032991
BVA		 1031/**
1032 * srp_claim_req - Take ownership of the scmnd associated with a request.
509c07bc 1033 * @ch: SRP RDMA channel.
22032991 1034 * @req: SRP request.
b3fe628d 1035 * @sdev: If not NULL, only take ownership for this SCSI device.
22032991
BVA		 1036 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
1037 * ownership of @req->scmnd if it equals @scmnd.
1038 *
1039 * Return value:
1040 * Either NULL or a pointer to the SCSI command the caller became owner of.
1041 */
509c07bc 1042static struct scsi_cmnd *srp_claim_req(struct srp_rdma_ch *ch,
22032991 1043 struct srp_request *req,
b3fe628d 1044 struct scsi_device *sdev,
22032991
BVA		 1045 struct scsi_cmnd *scmnd)
1046{
1047 unsigned long flags;
1048
509c07bc 1049 spin_lock_irqsave(&ch->lock, flags);
b3fe628d
BVA		 1050 if (req->scmnd &&
1051 (!sdev || req->scmnd->device == sdev) &&
1052 (!scmnd || req->scmnd == scmnd)) {
22032991
BVA		 1053 scmnd = req->scmnd;
1054 req->scmnd = NULL;
22032991
BVA		 1055 } else {
1056 scmnd = NULL;
1057 }
509c07bc 1058 spin_unlock_irqrestore(&ch->lock, flags);
22032991
BVA		 1059
1060 return scmnd;
1061}
1062
1063/**
1064 * srp_free_req() - Unmap data and add request to the free request list.
509c07bc 1065 * @ch: SRP RDMA channel.
af24663b
BVA		 1066 * @req: Request to be freed.
1067 * @scmnd: SCSI command associated with @req.
1068 * @req_lim_delta: Amount to be added to @target->req_lim.
22032991 1069 */
509c07bc
BVA		 1070static void srp_free_req(struct srp_rdma_ch *ch, struct srp_request *req,
1071 struct scsi_cmnd *scmnd, s32 req_lim_delta)
526b4caa 1072{
94a9174c
BVA		 1073 unsigned long flags;
1074
509c07bc 1075 srp_unmap_data(scmnd, ch, req);
22032991 1076
509c07bc
BVA		 1077 spin_lock_irqsave(&ch->lock, flags);
1078 ch->req_lim += req_lim_delta;
1079 list_add_tail(&req->list, &ch->free_reqs);
1080 spin_unlock_irqrestore(&ch->lock, flags);
526b4caa
IR		 1081}
1082
509c07bc
BVA		 1083static void srp_finish_req(struct srp_rdma_ch *ch, struct srp_request *req,
1084 struct scsi_device *sdev, int result)
526b4caa 1085{
509c07bc 1086 struct scsi_cmnd *scmnd = srp_claim_req(ch, req, sdev, NULL);
22032991
BVA		 1087
1088 if (scmnd) {
509c07bc 1089 srp_free_req(ch, req, scmnd, 0);
ed9b2264 1090 scmnd->result = result;
22032991 1091 scmnd->scsi_done(scmnd);
22032991 1092 }
526b4caa
IR		 1093}
1094
ed9b2264 1095static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 1096{
ed9b2264 1097 struct srp_target_port *target = rport->lld_data;
509c07bc 1098 struct srp_rdma_ch *ch = &target->ch;
b3fe628d
BVA		 1099 struct Scsi_Host *shost = target->scsi_host;
1100 struct scsi_device *sdev;
ed9b2264
BVA		 1101 int i;
1102
b3fe628d
BVA		 1103 /*
1104 * Invoking srp_terminate_io() while srp_queuecommand() is running
1105 * is not safe. Hence the warning statement below.
1106 */
1107 shost_for_each_device(sdev, shost)
1108 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
1109
4d73f95f 1110 for (i = 0; i < target->req_ring_size; ++i) {
509c07bc
BVA		 1111 struct srp_request *req = &ch->req_ring[i];
1112
1113 srp_finish_req(ch, req, NULL, DID_TRANSPORT_FAILFAST << 16);
ed9b2264
BVA		 1114 }
1115}
aef9ec39 1116
ed9b2264
BVA		 1117/*
1118 * It is up to the caller to ensure that srp_rport_reconnect() calls are
1119 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
1120 * srp_reset_device() or srp_reset_host() calls will occur while this function
1121 * is in progress. One way to realize that is not to call this function
1122 * directly but to call srp_reconnect_rport() instead since that last function
1123 * serializes calls of this function via rport->mutex and also blocks
1124 * srp_queuecommand() calls before invoking this function.
1125 */
1126static int srp_rport_reconnect(struct srp_rport *rport)
1127{
1128 struct srp_target_port *target = rport->lld_data;
509c07bc 1129 struct srp_rdma_ch *ch = &target->ch;
ed9b2264 1130 int i, ret;
09be70a2 1131
aef9ec39 1132 srp_disconnect_target(target);
34aa654e
BVA		 1133
1134 if (target->state == SRP_TARGET_SCANNING)
1135 return -ENODEV;
1136
aef9ec39 1137 /*
c7c4e7ff
BVA		 1138 * Now get a new local CM ID so that we avoid confusing the target in
1139 * case things are really fouled up. Doing so also ensures that all CM
1140 * callbacks will have finished before a new QP is allocated.
aef9ec39 1141 */
509c07bc 1142 ret = srp_new_cm_id(ch);
aef9ec39 1143
4d73f95f 1144 for (i = 0; i < target->req_ring_size; ++i) {
509c07bc
BVA		 1145 struct srp_request *req = &ch->req_ring[i];
1146
1147 srp_finish_req(ch, req, NULL, DID_RESET << 16);
536ae14e 1148 }
aef9ec39 1149
5cfb1782
BVA		 1150 /*
1151 * Whether or not creating a new CM ID succeeded, create a new
1152 * QP. This guarantees that all callback functions for the old QP have
1153 * finished before any send requests are posted on the new QP.
1154 */
509c07bc 1155 ret += srp_create_ch_ib(ch);
5cfb1782 1156
509c07bc 1157 INIT_LIST_HEAD(&ch->free_tx);
4d73f95f 1158 for (i = 0; i < target->queue_size; ++i)
509c07bc 1159 list_add(&ch->tx_ring[i]->list, &ch->free_tx);
aef9ec39 1160
c7c4e7ff 1161 if (ret == 0)
509c07bc 1162 ret = srp_connect_ch(ch);
09be70a2 1163
ed9b2264
BVA		 1164 if (ret == 0)
1165 shost_printk(KERN_INFO, target->scsi_host,
1166 PFX "reconnect succeeded\n");
aef9ec39
RD		 1167
1168 return ret;
1169}
1170
8f26c9ff
DD		 1171static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
1172 unsigned int dma_len, u32 rkey)
f5358a17 1173{
8f26c9ff 1174 struct srp_direct_buf *desc = state->desc;
f5358a17 1175
8f26c9ff
DD		 1176 desc->va = cpu_to_be64(dma_addr);
1177 desc->key = cpu_to_be32(rkey);
1178 desc->len = cpu_to_be32(dma_len);
f5358a17 1179
8f26c9ff
DD		 1180 state->total_len += dma_len;
1181 state->desc++;
1182 state->ndesc++;
1183}
559ce8f1 1184
8f26c9ff 1185static int srp_map_finish_fmr(struct srp_map_state *state,
509c07bc 1186 struct srp_rdma_ch *ch)
8f26c9ff 1187{
8f26c9ff
DD		 1188 struct ib_pool_fmr *fmr;
1189 u64 io_addr = 0;
85507bcc 1190
509c07bc 1191 fmr = ib_fmr_pool_map_phys(ch->fmr_pool, state->pages,
8f26c9ff
DD		 1192 state->npages, io_addr);
1193 if (IS_ERR(fmr))
1194 return PTR_ERR(fmr);
f5358a17 1195
8f26c9ff 1196 *state->next_fmr++ = fmr;
52ede08f 1197 state->nmdesc++;
f5358a17 1198
52ede08f 1199 srp_map_desc(state, 0, state->dma_len, fmr->fmr->rkey);
539dde6f 1200
8f26c9ff
DD		 1201 return 0;
1202}
1203
5cfb1782 1204static int srp_map_finish_fr(struct srp_map_state *state,
509c07bc 1205 struct srp_rdma_ch *ch)
5cfb1782 1206{
509c07bc 1207 struct srp_target_port *target = ch->target;
5cfb1782
BVA		 1208 struct srp_device *dev = target->srp_host->srp_dev;
1209 struct ib_send_wr *bad_wr;
1210 struct ib_send_wr wr;
1211 struct srp_fr_desc *desc;
1212 u32 rkey;
1213
509c07bc 1214 desc = srp_fr_pool_get(ch->fr_pool);
5cfb1782
BVA		 1215 if (!desc)
1216 return -ENOMEM;
1217
1218 rkey = ib_inc_rkey(desc->mr->rkey);
1219 ib_update_fast_reg_key(desc->mr, rkey);
1220
1221 memcpy(desc->frpl->page_list, state->pages,
1222 sizeof(state->pages[0]) * state->npages);
1223
1224 memset(&wr, 0, sizeof(wr));
1225 wr.opcode = IB_WR_FAST_REG_MR;
1226 wr.wr_id = FAST_REG_WR_ID_MASK;
1227 wr.wr.fast_reg.iova_start = state->base_dma_addr;
1228 wr.wr.fast_reg.page_list = desc->frpl;
1229 wr.wr.fast_reg.page_list_len = state->npages;
1230 wr.wr.fast_reg.page_shift = ilog2(dev->mr_page_size);
1231 wr.wr.fast_reg.length = state->dma_len;
1232 wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
1233 IB_ACCESS_REMOTE_READ |
1234 IB_ACCESS_REMOTE_WRITE);
1235 wr.wr.fast_reg.rkey = desc->mr->lkey;
1236
1237 *state->next_fr++ = desc;
1238 state->nmdesc++;
1239
1240 srp_map_desc(state, state->base_dma_addr, state->dma_len,
1241 desc->mr->rkey);
1242
509c07bc 1243 return ib_post_send(ch->qp, &wr, &bad_wr);
5cfb1782
BVA		 1244}
1245
539dde6f 1246static int srp_finish_mapping(struct srp_map_state *state,
509c07bc 1247 struct srp_rdma_ch *ch)
539dde6f 1248{
509c07bc 1249 struct srp_target_port *target = ch->target;
539dde6f
BVA		 1250 int ret = 0;
1251
1252 if (state->npages == 0)
1253 return 0;
1254
b1b8854d 1255 if (state->npages == 1 && !register_always)
52ede08f 1256 srp_map_desc(state, state->base_dma_addr, state->dma_len,
539dde6f
BVA		 1257 target->rkey);
1258 else
5cfb1782 1259 ret = target->srp_host->srp_dev->use_fast_reg ?
509c07bc
BVA		 1260 srp_map_finish_fr(state, ch) :
1261 srp_map_finish_fmr(state, ch);
539dde6f
BVA		 1262
1263 if (ret == 0) {
1264 state->npages = 0;
52ede08f 1265 state->dma_len = 0;
539dde6f
BVA		 1266 }
1267
1268 return ret;
1269}
1270
8f26c9ff
DD		 1271static void srp_map_update_start(struct srp_map_state *state,
1272 struct scatterlist *sg, int sg_index,
1273 dma_addr_t dma_addr)
1274{
1275 state->unmapped_sg = sg;
1276 state->unmapped_index = sg_index;
1277 state->unmapped_addr = dma_addr;
1278}
85507bcc 1279
8f26c9ff 1280static int srp_map_sg_entry(struct srp_map_state *state,
509c07bc 1281 struct srp_rdma_ch *ch,
8f26c9ff 1282 struct scatterlist *sg, int sg_index,
5cfb1782 1283 bool use_mr)
8f26c9ff 1284{
509c07bc 1285 struct srp_target_port *target = ch->target;
8f26c9ff
DD		 1286 struct srp_device *dev = target->srp_host->srp_dev;
1287 struct ib_device *ibdev = dev->dev;
1288 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
1289 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
1290 unsigned int len;
1291 int ret;
1292
1293 if (!dma_len)
1294 return 0;
1295
5cfb1782
BVA		 1296 if (!use_mr) {
1297 /*
1298 * Once we're in direct map mode for a request, we don't
1299 * go back to FMR or FR mode, so no need to update anything
8f26c9ff
DD		 1300 * other than the descriptor.
1301 */
1302 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1303 return 0;
85507bcc 1304 }
f5358a17 1305
5cfb1782
BVA		 1306 /*
1307 * Since not all RDMA HW drivers support non-zero page offsets for
1308 * FMR, if we start at an offset into a page, don't merge into the
1309 * current FMR mapping. Finish it out, and use the kernel's MR for
1310 * this sg entry.
8f26c9ff 1311 */
5cfb1782
BVA		 1312 if ((!dev->use_fast_reg && dma_addr & ~dev->mr_page_mask) ||
1313 dma_len > dev->mr_max_size) {
509c07bc 1314 ret = srp_finish_mapping(state, ch);
8f26c9ff
DD		 1315 if (ret)
1316 return ret;
1317
1318 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1319 srp_map_update_start(state, NULL, 0, 0);
1320 return 0;
f5358a17
RD		 1321 }
1322
5cfb1782
BVA		 1323 /*
1324 * If this is the first sg that will be mapped via FMR or via FR, save
1325 * our position. We need to know the first unmapped entry, its index,
1326 * and the first unmapped address within that entry to be able to
1327 * restart mapping after an error.
8f26c9ff
DD		 1328 */
1329 if (!state->unmapped_sg)
1330 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 1331
8f26c9ff 1332 while (dma_len) {
5cfb1782
BVA		 1333 unsigned offset = dma_addr & ~dev->mr_page_mask;
1334 if (state->npages == dev->max_pages_per_mr || offset != 0) {
509c07bc 1335 ret = srp_finish_mapping(state, ch);
8f26c9ff
DD		 1336 if (ret)
1337 return ret;
f5358a17 1338
8f26c9ff
DD		 1339 srp_map_update_start(state, sg, sg_index, dma_addr);
1340 }
1341
5cfb1782 1342 len = min_t(unsigned int, dma_len, dev->mr_page_size - offset);
f5358a17 1343
8f26c9ff
DD		 1344 if (!state->npages)
1345 state->base_dma_addr = dma_addr;
5cfb1782 1346 state->pages[state->npages++] = dma_addr & dev->mr_page_mask;
52ede08f 1347 state->dma_len += len;
8f26c9ff
DD		 1348 dma_addr += len;
1349 dma_len -= len;
1350 }
1351
5cfb1782
BVA		 1352 /*
1353 * If the last entry of the MR wasn't a full page, then we need to
8f26c9ff
DD		 1354 * close it out and start a new one -- we can only merge at page
1355 * boundries.
1356 */
1357 ret = 0;
52ede08f 1358 if (len != dev->mr_page_size) {
509c07bc 1359 ret = srp_finish_mapping(state, ch);
8f26c9ff
DD		 1360 if (!ret)
1361 srp_map_update_start(state, NULL, 0, 0);
1362 }
f5358a17
RD		 1363 return ret;
1364}
1365
509c07bc
BVA		 1366static int srp_map_sg(struct srp_map_state *state, struct srp_rdma_ch *ch,
1367 struct srp_request *req, struct scatterlist *scat,
1368 int count)
76bc1e1d 1369{
509c07bc 1370 struct srp_target_port *target = ch->target;
76bc1e1d
BVA		 1371 struct srp_device *dev = target->srp_host->srp_dev;
1372 struct ib_device *ibdev = dev->dev;
1373 struct scatterlist *sg;
5cfb1782
BVA		 1374 int i;
1375 bool use_mr;
76bc1e1d
BVA		 1376
1377 state->desc = req->indirect_desc;
1378 state->pages = req->map_page;
5cfb1782
BVA		 1379 if (dev->use_fast_reg) {
1380 state->next_fr = req->fr_list;
509c07bc 1381 use_mr = !!ch->fr_pool;
5cfb1782
BVA		 1382 } else {
1383 state->next_fmr = req->fmr_list;
509c07bc 1384 use_mr = !!ch->fmr_pool;
5cfb1782 1385 }
76bc1e1d
BVA		 1386
1387 for_each_sg(scat, sg, count, i) {
509c07bc 1388 if (srp_map_sg_entry(state, ch, sg, i, use_mr)) {
5cfb1782
BVA		 1389 /*
1390 * Memory registration failed, so backtrack to the
1391 * first unmapped entry and continue on without using
1392 * memory registration.
76bc1e1d
BVA		 1393 */
1394 dma_addr_t dma_addr;
1395 unsigned int dma_len;
1396
1397backtrack:
1398 sg = state->unmapped_sg;
1399 i = state->unmapped_index;
1400
1401 dma_addr = ib_sg_dma_address(ibdev, sg);
1402 dma_len = ib_sg_dma_len(ibdev, sg);
1403 dma_len -= (state->unmapped_addr - dma_addr);
1404 dma_addr = state->unmapped_addr;
5cfb1782 1405 use_mr = false;
76bc1e1d
BVA		 1406 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1407 }
1408 }
1409
509c07bc 1410 if (use_mr && srp_finish_mapping(state, ch))
76bc1e1d
BVA		 1411 goto backtrack;
1412
52ede08f 1413 req->nmdesc = state->nmdesc;
5cfb1782
BVA		 1414
1415 return 0;
76bc1e1d
BVA		 1416}
1417
509c07bc 1418static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
aef9ec39
RD		 1419 struct srp_request *req)
1420{
509c07bc 1421 struct srp_target_port *target = ch->target;
76bc1e1d 1422 struct scatterlist *scat;
aef9ec39 1423 struct srp_cmd *cmd = req->cmd->buf;
76bc1e1d 1424 int len, nents, count;
85507bcc
RC		 1425 struct srp_device *dev;
1426 struct ib_device *ibdev;
8f26c9ff
DD		 1427 struct srp_map_state state;
1428 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 1429 u32 table_len;
1430 u8 fmt;
aef9ec39 1431
bb350d1d 1432 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 1433 return sizeof (struct srp_cmd);
1434
1435 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1436 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 1437 shost_printk(KERN_WARNING, target->scsi_host,
1438 PFX "Unhandled data direction %d\n",
1439 scmnd->sc_data_direction);
aef9ec39
RD		 1440 return -EINVAL;
1441 }
1442
bb350d1d
FT		 1443 nents = scsi_sg_count(scmnd);
1444 scat = scsi_sglist(scmnd);
aef9ec39 1445
05321937 1446 dev = target->srp_host->srp_dev;
85507bcc
RC		 1447 ibdev = dev->dev;
1448
1449 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 1450 if (unlikely(count == 0))
1451 return -EIO;
f5358a17
RD		 1452
1453 fmt = SRP_DATA_DESC_DIRECT;
1454 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1455
b1b8854d 1456 if (count == 1 && !register_always) {
f5358a17
RD		 1457 /*
1458 * The midlayer only generated a single gather/scatter
1459 * entry, or DMA mapping coalesced everything to a
1460 * single entry. So a direct descriptor along with
1461 * the DMA MR suffices.
1462 */
cf368713 1463 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1464
85507bcc 1465 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1466 buf->key = cpu_to_be32(target->rkey);
85507bcc 1467 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff 1468
52ede08f 1469 req->nmdesc = 0;
8f26c9ff
DD		 1470 goto map_complete;
1471 }
1472
5cfb1782
BVA		 1473 /*
1474 * We have more than one scatter/gather entry, so build our indirect
1475 * descriptor table, trying to merge as many entries as we can.
8f26c9ff
DD		 1476 */
1477 indirect_hdr = (void *) cmd->add_data;
1478
c07d424d
DD		 1479 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1480 target->indirect_size, DMA_TO_DEVICE);
1481
8f26c9ff 1482 memset(&state, 0, sizeof(state));
509c07bc 1483 srp_map_sg(&state, ch, req, scat, count);
cf368713 1484
c07d424d
DD		 1485 /* We've mapped the request, now pull as much of the indirect
1486 * descriptor table as we can into the command buffer. If this
1487 * target is not using an external indirect table, we are
1488 * guaranteed to fit into the command, as the SCSI layer won't
1489 * give us more S/G entries than we allow.
8f26c9ff 1490 */
8f26c9ff 1491 if (state.ndesc == 1) {
5cfb1782
BVA		 1492 /*
1493 * Memory registration collapsed the sg-list into one entry,
8f26c9ff
DD		 1494 * so use a direct descriptor.
1495 */
1496 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1497
c07d424d 1498 *buf = req->indirect_desc[0];
8f26c9ff 1499 goto map_complete;
aef9ec39
RD		 1500 }
1501
c07d424d
DD		 1502 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1503 !target->allow_ext_sg)) {
1504 shost_printk(KERN_ERR, target->scsi_host,
1505 "Could not fit S/G list into SRP_CMD\n");
1506 return -EIO;
1507 }
1508
1509 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1510 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1511
1512 fmt = SRP_DATA_DESC_INDIRECT;
1513 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1514 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1515
c07d424d
DD		 1516 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1517 count * sizeof (struct srp_direct_buf));
8f26c9ff 1518
c07d424d 1519 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1520 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1521 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1522 indirect_hdr->len = cpu_to_be32(state.total_len);
1523
1524 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1525 cmd->data_out_desc_cnt = count;
8f26c9ff 1526 else
c07d424d
DD		 1527 cmd->data_in_desc_cnt = count;
1528
1529 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1530 DMA_TO_DEVICE);
8f26c9ff
DD		 1531
1532map_complete:
aef9ec39
RD		 1533 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1534 cmd->buf_fmt = fmt << 4;
1535 else
1536 cmd->buf_fmt = fmt;
1537
aef9ec39
RD		 1538 return len;
1539}
1540
76c75b25
BVA		 1541/*
1542 * Return an IU and possible credit to the free pool
1543 */
509c07bc 1544static void srp_put_tx_iu(struct srp_rdma_ch *ch, struct srp_iu *iu,
76c75b25
BVA		 1545 enum srp_iu_type iu_type)
1546{
1547 unsigned long flags;
1548
509c07bc
BVA		 1549 spin_lock_irqsave(&ch->lock, flags);
1550 list_add(&iu->list, &ch->free_tx);
76c75b25 1551 if (iu_type != SRP_IU_RSP)
509c07bc
BVA		 1552 ++ch->req_lim;
1553 spin_unlock_irqrestore(&ch->lock, flags);
76c75b25
BVA		 1554}
1555
05a1d750 1556/*
509c07bc 1557 * Must be called with ch->lock held to protect req_lim and free_tx.
e9684678 1558 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1559 *
1560 * Note:
1561 * An upper limit for the number of allocated information units for each
1562 * request type is:
1563 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1564 * more than Scsi_Host.can_queue requests.
1565 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1566 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1567 * one unanswered SRP request to an initiator.
1568 */
509c07bc 1569static struct srp_iu *__srp_get_tx_iu(struct srp_rdma_ch *ch,
05a1d750
DD		 1570 enum srp_iu_type iu_type)
1571{
509c07bc 1572 struct srp_target_port *target = ch->target;
05a1d750
DD		 1573 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1574 struct srp_iu *iu;
1575
509c07bc 1576 srp_send_completion(ch->send_cq, ch);
05a1d750 1577
509c07bc 1578 if (list_empty(&ch->free_tx))
05a1d750
DD		 1579 return NULL;
1580
1581 /* Initiator responses to target requests do not consume credits */
76c75b25 1582 if (iu_type != SRP_IU_RSP) {
509c07bc 1583 if (ch->req_lim <= rsv) {
76c75b25
BVA		 1584 ++target->zero_req_lim;
1585 return NULL;
1586 }
1587
509c07bc 1588 --ch->req_lim;
05a1d750
DD		 1589 }
1590
509c07bc 1591 iu = list_first_entry(&ch->free_tx, struct srp_iu, list);
76c75b25 1592 list_del(&iu->list);
05a1d750
DD		 1593 return iu;
1594}
1595
509c07bc 1596static int srp_post_send(struct srp_rdma_ch *ch, struct srp_iu *iu, int len)
05a1d750 1597{
509c07bc 1598 struct srp_target_port *target = ch->target;
05a1d750
DD		 1599 struct ib_sge list;
1600 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1601
1602 list.addr = iu->dma;
1603 list.length = len;
9af76271 1604 list.lkey = target->lkey;
05a1d750
DD		 1605
1606 wr.next = NULL;
dcb4cb85 1607 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1608 wr.sg_list = &list;
1609 wr.num_sge = 1;
1610 wr.opcode = IB_WR_SEND;
1611 wr.send_flags = IB_SEND_SIGNALED;
1612
509c07bc 1613 return ib_post_send(ch->qp, &wr, &bad_wr);
05a1d750
DD		 1614}
1615
509c07bc 1616static int srp_post_recv(struct srp_rdma_ch *ch, struct srp_iu *iu)
c996bb47 1617{
509c07bc 1618 struct srp_target_port *target = ch->target;
c996bb47 1619 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1620 struct ib_sge list;
c996bb47
BVA		 1621
1622 list.addr = iu->dma;
1623 list.length = iu->size;
9af76271 1624 list.lkey = target->lkey;
c996bb47
BVA		 1625
1626 wr.next = NULL;
dcb4cb85 1627 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1628 wr.sg_list = &list;
1629 wr.num_sge = 1;
1630
509c07bc 1631 return ib_post_recv(ch->qp, &wr, &bad_wr);
c996bb47
BVA		 1632}
1633
509c07bc 1634static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp)
aef9ec39 1635{
509c07bc 1636 struct srp_target_port *target = ch->target;
aef9ec39
RD		 1637 struct srp_request *req;
1638 struct scsi_cmnd *scmnd;
1639 unsigned long flags;
aef9ec39 1640
aef9ec39 1641 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
509c07bc
BVA		 1642 spin_lock_irqsave(&ch->lock, flags);
1643 ch->req_lim += be32_to_cpu(rsp->req_lim_delta);
1644 spin_unlock_irqrestore(&ch->lock, flags);
94a9174c 1645
509c07bc 1646 ch->tsk_mgmt_status = -1;
f8b6e31e 1647 if (be32_to_cpu(rsp->resp_data_len) >= 4)
509c07bc
BVA		 1648 ch->tsk_mgmt_status = rsp->data[3];
1649 complete(&ch->tsk_mgmt_done);
aef9ec39 1650 } else {
509c07bc
BVA		 1651 req = &ch->req_ring[rsp->tag];
1652 scmnd = srp_claim_req(ch, req, NULL, NULL);
22032991 1653 if (!scmnd) {
7aa54bd7
DD		 1654 shost_printk(KERN_ERR, target->scsi_host,
1655 "Null scmnd for RSP w/tag %016llx\n",
1656 (unsigned long long) rsp->tag);
22032991 1657
509c07bc
BVA		 1658 spin_lock_irqsave(&ch->lock, flags);
1659 ch->req_lim += be32_to_cpu(rsp->req_lim_delta);
1660 spin_unlock_irqrestore(&ch->lock, flags);
22032991
BVA		 1661
1662 return;
1663 }
aef9ec39
RD		 1664 scmnd->result = rsp->status;
1665
1666 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1667 memcpy(scmnd->sense_buffer, rsp->data +
1668 be32_to_cpu(rsp->resp_data_len),
1669 min_t(int, be32_to_cpu(rsp->sense_data_len),
1670 SCSI_SENSE_BUFFERSIZE));
1671 }
1672
e714531a 1673 if (unlikely(rsp->flags & SRP_RSP_FLAG_DIUNDER))
bb350d1d 1674 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
e714531a
BVA		 1675 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DIOVER))
1676 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_in_res_cnt));
1677 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOUNDER))
1678 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1679 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOOVER))
1680 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1681
509c07bc 1682 srp_free_req(ch, req, scmnd,
22032991
BVA		 1683 be32_to_cpu(rsp->req_lim_delta));
1684
f8b6e31e
DD		 1685 scmnd->host_scribble = NULL;
1686 scmnd->scsi_done(scmnd);
aef9ec39 1687 }
aef9ec39
RD		 1688}
1689
509c07bc 1690static int srp_response_common(struct srp_rdma_ch *ch, s32 req_delta,
bb12588a
DD		 1691 void *rsp, int len)
1692{
509c07bc 1693 struct srp_target_port *target = ch->target;
76c75b25 1694 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1695 unsigned long flags;
1696 struct srp_iu *iu;
76c75b25 1697 int err;
bb12588a 1698
509c07bc
BVA		 1699 spin_lock_irqsave(&ch->lock, flags);
1700 ch->req_lim += req_delta;
1701 iu = __srp_get_tx_iu(ch, SRP_IU_RSP);
1702 spin_unlock_irqrestore(&ch->lock, flags);
76c75b25 1703
bb12588a
DD		 1704 if (!iu) {
1705 shost_printk(KERN_ERR, target->scsi_host, PFX
1706 "no IU available to send response\n");
76c75b25 1707 return 1;
bb12588a
DD		 1708 }
1709
1710 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1711 memcpy(iu->buf, rsp, len);
1712 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1713
509c07bc 1714 err = srp_post_send(ch, iu, len);
76c75b25 1715 if (err) {
bb12588a
DD		 1716 shost_printk(KERN_ERR, target->scsi_host, PFX
1717 "unable to post response: %d\n", err);
509c07bc 1718 srp_put_tx_iu(ch, iu, SRP_IU_RSP);
76c75b25 1719 }
bb12588a 1720
bb12588a
DD		 1721 return err;
1722}
1723
509c07bc 1724static void srp_process_cred_req(struct srp_rdma_ch *ch,
bb12588a
DD		 1725 struct srp_cred_req *req)
1726{
1727 struct srp_cred_rsp rsp = {
1728 .opcode = SRP_CRED_RSP,
1729 .tag = req->tag,
1730 };
1731 s32 delta = be32_to_cpu(req->req_lim_delta);
1732
509c07bc
BVA		 1733 if (srp_response_common(ch, delta, &rsp, sizeof(rsp)))
1734 shost_printk(KERN_ERR, ch->target->scsi_host, PFX
bb12588a
DD		 1735 "problems processing SRP_CRED_REQ\n");
1736}
1737
509c07bc 1738static void srp_process_aer_req(struct srp_rdma_ch *ch,
bb12588a
DD		 1739 struct srp_aer_req *req)
1740{
509c07bc 1741 struct srp_target_port *target = ch->target;
bb12588a
DD		 1742 struct srp_aer_rsp rsp = {
1743 .opcode = SRP_AER_RSP,
1744 .tag = req->tag,
1745 };
1746 s32 delta = be32_to_cpu(req->req_lim_delta);
1747
1748 shost_printk(KERN_ERR, target->scsi_host, PFX
1749 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1750
509c07bc 1751 if (srp_response_common(ch, delta, &rsp, sizeof(rsp)))
bb12588a
DD		 1752 shost_printk(KERN_ERR, target->scsi_host, PFX
1753 "problems processing SRP_AER_REQ\n");
1754}
1755
509c07bc 1756static void srp_handle_recv(struct srp_rdma_ch *ch, struct ib_wc *wc)
aef9ec39 1757{
509c07bc 1758 struct srp_target_port *target = ch->target;
dcb4cb85 1759 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1760 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1761 int res;
aef9ec39
RD		 1762 u8 opcode;
1763
509c07bc 1764 ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_ti_iu_len,
85507bcc 1765 DMA_FROM_DEVICE);
aef9ec39
RD		 1766
1767 opcode = *(u8 *) iu->buf;
1768
1769 if (0) {
7aa54bd7
DD		 1770 shost_printk(KERN_ERR, target->scsi_host,
1771 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1772 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1773 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1774 }
1775
1776 switch (opcode) {
1777 case SRP_RSP:
509c07bc 1778 srp_process_rsp(ch, iu->buf);
aef9ec39
RD		 1779 break;
1780
bb12588a 1781 case SRP_CRED_REQ:
509c07bc 1782 srp_process_cred_req(ch, iu->buf);
bb12588a
DD		 1783 break;
1784
1785 case SRP_AER_REQ:
509c07bc 1786 srp_process_aer_req(ch, iu->buf);
bb12588a
DD		 1787 break;
1788
aef9ec39
RD		 1789 case SRP_T_LOGOUT:
1790 /* XXX Handle target logout */
7aa54bd7
DD		 1791 shost_printk(KERN_WARNING, target->scsi_host,
1792 PFX "Got target logout request\n");
aef9ec39
RD		 1793 break;
1794
1795 default:
7aa54bd7
DD		 1796 shost_printk(KERN_WARNING, target->scsi_host,
1797 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1798 break;
1799 }
1800
509c07bc 1801 ib_dma_sync_single_for_device(dev, iu->dma, ch->max_ti_iu_len,
85507bcc 1802 DMA_FROM_DEVICE);
c996bb47 1803
509c07bc 1804 res = srp_post_recv(ch, iu);
c996bb47
BVA		 1805 if (res != 0)
1806 shost_printk(KERN_ERR, target->scsi_host,
1807 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1808}
1809
c1120f89
BVA		 1810/**
1811 * srp_tl_err_work() - handle a transport layer error
af24663b 1812 * @work: Work structure embedded in an SRP target port.
c1120f89
BVA		 1813 *
1814 * Note: This function may get invoked before the rport has been created,
1815 * hence the target->rport test.
1816 */
1817static void srp_tl_err_work(struct work_struct *work)
1818{
1819 struct srp_target_port *target;
1820
1821 target = container_of(work, struct srp_target_port, tl_err_work);
1822 if (target->rport)
1823 srp_start_tl_fail_timers(target->rport);
1824}
1825
5cfb1782
BVA		 1826static void srp_handle_qp_err(u64 wr_id, enum ib_wc_status wc_status,
1827 bool send_err, struct srp_target_port *target)
948d1e88 1828{
294c875a 1829 if (target->connected && !target->qp_in_error) {
5cfb1782
BVA		 1830 if (wr_id & LOCAL_INV_WR_ID_MASK) {
1831 shost_printk(KERN_ERR, target->scsi_host, PFX
1832 "LOCAL_INV failed with status %d\n",
1833 wc_status);
1834 } else if (wr_id & FAST_REG_WR_ID_MASK) {
1835 shost_printk(KERN_ERR, target->scsi_host, PFX
1836 "FAST_REG_MR failed status %d\n",
1837 wc_status);
1838 } else {
1839 shost_printk(KERN_ERR, target->scsi_host,
1840 PFX "failed %s status %d for iu %p\n",
1841 send_err ? "send" : "receive",
1842 wc_status, (void *)(uintptr_t)wr_id);
1843 }
c1120f89 1844 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1845 }
948d1e88
BVA		 1846 target->qp_in_error = true;
1847}
1848
509c07bc 1849static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr)
aef9ec39 1850{
509c07bc 1851 struct srp_rdma_ch *ch = ch_ptr;
aef9ec39 1852 struct ib_wc wc;
aef9ec39
RD		 1853
1854 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1855 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88 1856 if (likely(wc.status == IB_WC_SUCCESS)) {
509c07bc 1857 srp_handle_recv(ch, &wc);
948d1e88 1858 } else {
509c07bc
BVA		 1859 srp_handle_qp_err(wc.wr_id, wc.status, false,
1860 ch->target);
aef9ec39 1861 }
9c03dc9f
BVA		 1862 }
1863}
1864
509c07bc 1865static void srp_send_completion(struct ib_cq *cq, void *ch_ptr)
9c03dc9f 1866{
509c07bc 1867 struct srp_rdma_ch *ch = ch_ptr;
9c03dc9f 1868 struct ib_wc wc;
dcb4cb85 1869 struct srp_iu *iu;
9c03dc9f
BVA		 1870
1871 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1872 if (likely(wc.status == IB_WC_SUCCESS)) {
1873 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
509c07bc 1874 list_add(&iu->list, &ch->free_tx);
948d1e88 1875 } else {
509c07bc
BVA		 1876 srp_handle_qp_err(wc.wr_id, wc.status, true,
1877 ch->target);
9c03dc9f 1878 }
aef9ec39
RD		 1879 }
1880}
1881
76c75b25 1882static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1883{
76c75b25 1884 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1885 struct srp_rport *rport = target->rport;
509c07bc 1886 struct srp_rdma_ch *ch;
aef9ec39
RD		 1887 struct srp_request *req;
1888 struct srp_iu *iu;
1889 struct srp_cmd *cmd;
85507bcc 1890 struct ib_device *dev;
76c75b25 1891 unsigned long flags;
d1b4289e 1892 int len, ret;
a95cadb9
BVA		 1893 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1894
1895 /*
1896 * The SCSI EH thread is the only context from which srp_queuecommand()
1897 * can get invoked for blocked devices (SDEV_BLOCK /
1898 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1899 * locking the rport mutex if invoked from inside the SCSI EH.
1900 */
1901 if (in_scsi_eh)
1902 mutex_lock(&rport->mutex);
aef9ec39 1903
d1b4289e
BVA		 1904 scmnd->result = srp_chkready(target->rport);
1905 if (unlikely(scmnd->result))
1906 goto err;
2ce19e72 1907
509c07bc
BVA		 1908 ch = &target->ch;
1909
1910 spin_lock_irqsave(&ch->lock, flags);
1911 iu = __srp_get_tx_iu(ch, SRP_IU_CMD);
aef9ec39 1912 if (!iu)
695b8349
BVA		 1913 goto err_unlock;
1914
509c07bc 1915 req = list_first_entry(&ch->free_reqs, struct srp_request, list);
695b8349 1916 list_del(&req->list);
509c07bc 1917 spin_unlock_irqrestore(&ch->lock, flags);
aef9ec39 1918
05321937 1919 dev = target->srp_host->srp_dev->dev;
49248644 1920 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1921 DMA_TO_DEVICE);
aef9ec39 1922
f8b6e31e 1923 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1924
1925 cmd = iu->buf;
1926 memset(cmd, 0, sizeof *cmd);
1927
1928 cmd->opcode = SRP_CMD;
1929 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1930 cmd->tag = req->index;
aef9ec39
RD		 1931 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1932
aef9ec39
RD		 1933 req->scmnd = scmnd;
1934 req->cmd = iu;
aef9ec39 1935
509c07bc 1936 len = srp_map_data(scmnd, ch, req);
aef9ec39 1937 if (len < 0) {
7aa54bd7 1938 shost_printk(KERN_ERR, target->scsi_host,
d1b4289e
BVA		 1939 PFX "Failed to map data (%d)\n", len);
1940 /*
1941 * If we ran out of memory descriptors (-ENOMEM) because an
1942 * application is queuing many requests with more than
52ede08f 1943 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
d1b4289e
BVA		 1944 * to reduce queue depth temporarily.
1945 */
1946 scmnd->result = len == -ENOMEM ?
1947 DID_OK << 16 | QUEUE_FULL << 1 : DID_ERROR << 16;
76c75b25 1948 goto err_iu;
aef9ec39
RD		 1949 }
1950
49248644 1951 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1952 DMA_TO_DEVICE);
aef9ec39 1953
509c07bc 1954 if (srp_post_send(ch, iu, len)) {
7aa54bd7 1955 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1956 goto err_unmap;
1957 }
1958
d1b4289e
BVA		 1959 ret = 0;
1960
a95cadb9
BVA		 1961unlock_rport:
1962 if (in_scsi_eh)
1963 mutex_unlock(&rport->mutex);
1964
d1b4289e 1965 return ret;
aef9ec39
RD		 1966
1967err_unmap:
509c07bc 1968 srp_unmap_data(scmnd, ch, req);
aef9ec39 1969
76c75b25 1970err_iu:
509c07bc 1971 srp_put_tx_iu(ch, iu, SRP_IU_CMD);
76c75b25 1972
024ca901
BVA		 1973 /*
1974 * Avoid that the loops that iterate over the request ring can
1975 * encounter a dangling SCSI command pointer.
1976 */
1977 req->scmnd = NULL;
1978
509c07bc
BVA		 1979 spin_lock_irqsave(&ch->lock, flags);
1980 list_add(&req->list, &ch->free_reqs);
695b8349
BVA		 1981
1982err_unlock:
509c07bc 1983 spin_unlock_irqrestore(&ch->lock, flags);
76c75b25 1984
d1b4289e
BVA		 1985err:
1986 if (scmnd->result) {
1987 scmnd->scsi_done(scmnd);
1988 ret = 0;
1989 } else {
1990 ret = SCSI_MLQUEUE_HOST_BUSY;
1991 }
a95cadb9 1992
d1b4289e 1993 goto unlock_rport;
aef9ec39
RD		 1994}
1995
4d73f95f
BVA		 1996/*
1997 * Note: the resources allocated in this function are freed in
509c07bc 1998 * srp_free_ch_ib().
4d73f95f 1999 */
509c07bc 2000static int srp_alloc_iu_bufs(struct srp_rdma_ch *ch)
aef9ec39 2001{
509c07bc 2002 struct srp_target_port *target = ch->target;
aef9ec39
RD		 2003 int i;
2004
509c07bc
BVA		 2005 ch->rx_ring = kcalloc(target->queue_size, sizeof(*ch->rx_ring),
2006 GFP_KERNEL);
2007 if (!ch->rx_ring)
4d73f95f 2008 goto err_no_ring;
509c07bc
BVA		 2009 ch->tx_ring = kcalloc(target->queue_size, sizeof(*ch->tx_ring),
2010 GFP_KERNEL);
2011 if (!ch->tx_ring)
4d73f95f
BVA		 2012 goto err_no_ring;
2013
2014 for (i = 0; i < target->queue_size; ++i) {
509c07bc
BVA		 2015 ch->rx_ring[i] = srp_alloc_iu(target->srp_host,
2016 ch->max_ti_iu_len,
2017 GFP_KERNEL, DMA_FROM_DEVICE);
2018 if (!ch->rx_ring[i])
aef9ec39
RD		 2019 goto err;
2020 }
2021
4d73f95f 2022 for (i = 0; i < target->queue_size; ++i) {
509c07bc
BVA		 2023 ch->tx_ring[i] = srp_alloc_iu(target->srp_host,
2024 target->max_iu_len,
2025 GFP_KERNEL, DMA_TO_DEVICE);
2026 if (!ch->tx_ring[i])
aef9ec39 2027 goto err;
dcb4cb85 2028
509c07bc 2029 list_add(&ch->tx_ring[i]->list, &ch->free_tx);
aef9ec39
RD		 2030 }
2031
2032 return 0;
2033
2034err:
4d73f95f 2035 for (i = 0; i < target->queue_size; ++i) {
509c07bc
BVA		 2036 srp_free_iu(target->srp_host, ch->rx_ring[i]);
2037 srp_free_iu(target->srp_host, ch->tx_ring[i]);
aef9ec39
RD		 2038 }
2039
4d73f95f
BVA		 2040
2041err_no_ring:
509c07bc
BVA		 2042 kfree(ch->tx_ring);
2043 ch->tx_ring = NULL;
2044 kfree(ch->rx_ring);
2045 ch->rx_ring = NULL;
4d73f95f 2046
aef9ec39
RD		 2047 return -ENOMEM;
2048}
2049
c9b03c1a
BVA		 2050static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
2051{
2052 uint64_t T_tr_ns, max_compl_time_ms;
2053 uint32_t rq_tmo_jiffies;
2054
2055 /*
2056 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
2057 * table 91), both the QP timeout and the retry count have to be set
2058 * for RC QP's during the RTR to RTS transition.
2059 */
2060 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
2061 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
2062
2063 /*
2064 * Set target->rq_tmo_jiffies to one second more than the largest time
2065 * it can take before an error completion is generated. See also
2066 * C9-140..142 in the IBTA spec for more information about how to
2067 * convert the QP Local ACK Timeout value to nanoseconds.
2068 */
2069 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
2070 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
2071 do_div(max_compl_time_ms, NSEC_PER_MSEC);
2072 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
2073
2074 return rq_tmo_jiffies;
2075}
2076
961e0be8
DD		 2077static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
2078 struct srp_login_rsp *lrsp,
509c07bc 2079 struct srp_rdma_ch *ch)
961e0be8 2080{
509c07bc 2081 struct srp_target_port *target = ch->target;
961e0be8
DD		 2082 struct ib_qp_attr *qp_attr = NULL;
2083 int attr_mask = 0;
2084 int ret;
2085 int i;
2086
2087 if (lrsp->opcode == SRP_LOGIN_RSP) {
509c07bc
BVA		 2088 ch->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
2089 ch->req_lim = be32_to_cpu(lrsp->req_lim_delta);
961e0be8
DD		 2090
2091 /*
2092 * Reserve credits for task management so we don't
2093 * bounce requests back to the SCSI mid-layer.
2094 */
2095 target->scsi_host->can_queue
509c07bc 2096 = min(ch->req_lim - SRP_TSK_MGMT_SQ_SIZE,
961e0be8 2097 target->scsi_host->can_queue);
4d73f95f
BVA		 2098 target->scsi_host->cmd_per_lun
2099 = min_t(int, target->scsi_host->can_queue,
2100 target->scsi_host->cmd_per_lun);
961e0be8
DD		 2101 } else {
2102 shost_printk(KERN_WARNING, target->scsi_host,
2103 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
2104 ret = -ECONNRESET;
2105 goto error;
2106 }
2107
509c07bc
BVA		 2108 if (!ch->rx_ring) {
2109 ret = srp_alloc_iu_bufs(ch);
961e0be8
DD		 2110 if (ret)
2111 goto error;
2112 }
2113
2114 ret = -ENOMEM;
2115 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
2116 if (!qp_attr)
2117 goto error;
2118
2119 qp_attr->qp_state = IB_QPS_RTR;
2120 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2121 if (ret)
2122 goto error_free;
2123
509c07bc 2124 ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
961e0be8
DD		 2125 if (ret)
2126 goto error_free;
2127
4d73f95f 2128 for (i = 0; i < target->queue_size; i++) {
509c07bc
BVA		 2129 struct srp_iu *iu = ch->rx_ring[i];
2130
2131 ret = srp_post_recv(ch, iu);
961e0be8
DD		 2132 if (ret)
2133 goto error_free;
2134 }
2135
2136 qp_attr->qp_state = IB_QPS_RTS;
2137 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2138 if (ret)
2139 goto error_free;
2140
c9b03c1a
BVA		 2141 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
2142
509c07bc 2143 ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
961e0be8
DD		 2144 if (ret)
2145 goto error_free;
2146
2147 ret = ib_send_cm_rtu(cm_id, NULL, 0);
2148
2149error_free:
2150 kfree(qp_attr);
2151
2152error:
509c07bc 2153 ch->status = ret;
961e0be8
DD		 2154}
2155
aef9ec39
RD		 2156static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
2157 struct ib_cm_event *event,
509c07bc 2158 struct srp_rdma_ch *ch)
aef9ec39 2159{
509c07bc 2160 struct srp_target_port *target = ch->target;
7aa54bd7 2161 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 2162 struct ib_class_port_info *cpi;
2163 int opcode;
2164
2165 switch (event->param.rej_rcvd.reason) {
2166 case IB_CM_REJ_PORT_CM_REDIRECT:
2167 cpi = event->param.rej_rcvd.ari;
509c07bc
BVA		 2168 ch->path.dlid = cpi->redirect_lid;
2169 ch->path.pkey = cpi->redirect_pkey;
aef9ec39 2170 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
509c07bc 2171 memcpy(ch->path.dgid.raw, cpi->redirect_gid, 16);
aef9ec39 2172
509c07bc 2173 ch->status = ch->path.dlid ?
aef9ec39
RD		 2174 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
2175 break;
2176
2177 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 2178 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 2179 /*
2180 * Topspin/Cisco SRP gateways incorrectly send
2181 * reject reason code 25 when they mean 24
2182 * (port redirect).
2183 */
509c07bc 2184 memcpy(ch->path.dgid.raw,
aef9ec39
RD		 2185 event->param.rej_rcvd.ari, 16);
2186
7aa54bd7
DD		 2187 shost_printk(KERN_DEBUG, shost,
2188 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
509c07bc
BVA		 2189 be64_to_cpu(ch->path.dgid.global.subnet_prefix),
2190 be64_to_cpu(ch->path.dgid.global.interface_id));
aef9ec39 2191
509c07bc 2192 ch->status = SRP_PORT_REDIRECT;
aef9ec39 2193 } else {
7aa54bd7
DD		 2194 shost_printk(KERN_WARNING, shost,
2195 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
509c07bc 2196 ch->status = -ECONNRESET;
aef9ec39
RD		 2197 }
2198 break;
2199
2200 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 2201 shost_printk(KERN_WARNING, shost,
2202 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
509c07bc 2203 ch->status = -ECONNRESET;
aef9ec39
RD		 2204 break;
2205
2206 case IB_CM_REJ_CONSUMER_DEFINED:
2207 opcode = *(u8 *) event->private_data;
2208 if (opcode == SRP_LOGIN_REJ) {
2209 struct srp_login_rej *rej = event->private_data;
2210 u32 reason = be32_to_cpu(rej->reason);
2211
2212 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 2213 shost_printk(KERN_WARNING, shost,
2214 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 2215 else
e7ffde01
BVA		 2216 shost_printk(KERN_WARNING, shost, PFX
2217 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
747fe000
BVA		 2218 target->sgid.raw,
2219 target->orig_dgid.raw, reason);
aef9ec39 2220 } else
7aa54bd7
DD		 2221 shost_printk(KERN_WARNING, shost,
2222 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
2223 " opcode 0x%02x\n", opcode);
509c07bc 2224 ch->status = -ECONNRESET;
aef9ec39
RD		 2225 break;
2226
9fe4bcf4
DD		 2227 case IB_CM_REJ_STALE_CONN:
2228 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
509c07bc 2229 ch->status = SRP_STALE_CONN;
9fe4bcf4
DD		 2230 break;
2231
aef9ec39 2232 default:
7aa54bd7
DD		 2233 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
2234 event->param.rej_rcvd.reason);
509c07bc 2235 ch->status = -ECONNRESET;
aef9ec39
RD		 2236 }
2237}
2238
2239static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2240{
509c07bc
BVA		 2241 struct srp_rdma_ch *ch = cm_id->context;
2242 struct srp_target_port *target = ch->target;
aef9ec39 2243 int comp = 0;
aef9ec39
RD		 2244
2245 switch (event->event) {
2246 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 2247 shost_printk(KERN_DEBUG, target->scsi_host,
2248 PFX "Sending CM REQ failed\n");
aef9ec39 2249 comp = 1;
509c07bc 2250 ch->status = -ECONNRESET;
aef9ec39
RD		 2251 break;
2252
2253 case IB_CM_REP_RECEIVED:
2254 comp = 1;
509c07bc 2255 srp_cm_rep_handler(cm_id, event->private_data, ch);
aef9ec39
RD		 2256 break;
2257
2258 case IB_CM_REJ_RECEIVED:
7aa54bd7 2259 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 2260 comp = 1;
2261
509c07bc 2262 srp_cm_rej_handler(cm_id, event, ch);
aef9ec39
RD		 2263 break;
2264
b7ac4ab4 2265 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 2266 shost_printk(KERN_WARNING, target->scsi_host,
2267 PFX "DREQ received - connection closed\n");
294c875a 2268 srp_change_conn_state(target, false);
b7ac4ab4 2269 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 2270 shost_printk(KERN_ERR, target->scsi_host,
2271 PFX "Sending CM DREP failed\n");
c1120f89 2272 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 2273 break;
2274
2275 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 2276 shost_printk(KERN_ERR, target->scsi_host,
2277 PFX "connection closed\n");
ac72d766 2278 comp = 1;
aef9ec39 2279
509c07bc 2280 ch->status = 0;
aef9ec39
RD		 2281 break;
2282
b7ac4ab4
IR		 2283 case IB_CM_MRA_RECEIVED:
2284 case IB_CM_DREQ_ERROR:
2285 case IB_CM_DREP_RECEIVED:
2286 break;
2287
aef9ec39 2288 default:
7aa54bd7
DD		 2289 shost_printk(KERN_WARNING, target->scsi_host,
2290 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 2291 break;
2292 }
2293
2294 if (comp)
509c07bc 2295 complete(&ch->done);
aef9ec39 2296
aef9ec39
RD		 2297 return 0;
2298}
2299
71444b97
JW		 2300/**
2301 * srp_change_queue_depth - setting device queue depth
2302 * @sdev: scsi device struct
2303 * @qdepth: requested queue depth
2304 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
2305 * (see include/scsi/scsi_host.h for definition)
2306 *
2307 * Returns queue depth.
2308 */
2309static int
2310srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2311{
2312 struct Scsi_Host *shost = sdev->host;
2313 int max_depth;
2314 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
2315 max_depth = shost->can_queue;
2316 if (!sdev->tagged_supported)
2317 max_depth = 1;
2318 if (qdepth > max_depth)
2319 qdepth = max_depth;
c8b09f6f 2320 scsi_adjust_queue_depth(sdev, qdepth);
71444b97
JW		 2321 } else if (reason == SCSI_QDEPTH_QFULL)
2322 scsi_track_queue_full(sdev, qdepth);
2323 else
2324 return -EOPNOTSUPP;
2325
2326 return sdev->queue_depth;
2327}
2328
509c07bc
BVA		 2329static int srp_send_tsk_mgmt(struct srp_rdma_ch *ch, u64 req_tag,
2330 unsigned int lun, u8 func)
aef9ec39 2331{
509c07bc 2332 struct srp_target_port *target = ch->target;
a95cadb9 2333 struct srp_rport *rport = target->rport;
19081f31 2334 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 2335 struct srp_iu *iu;
2336 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 2337
3780d1f0
BVA		 2338 if (!target->connected || target->qp_in_error)
2339 return -1;
2340
509c07bc 2341 init_completion(&ch->tsk_mgmt_done);
aef9ec39 2342
a95cadb9 2343 /*
509c07bc 2344 * Lock the rport mutex to avoid that srp_create_ch_ib() is
a95cadb9
BVA		 2345 * invoked while a task management function is being sent.
2346 */
2347 mutex_lock(&rport->mutex);
509c07bc
BVA		 2348 spin_lock_irq(&ch->lock);
2349 iu = __srp_get_tx_iu(ch, SRP_IU_TSK_MGMT);
2350 spin_unlock_irq(&ch->lock);
76c75b25 2351
a95cadb9
BVA		 2352 if (!iu) {
2353 mutex_unlock(&rport->mutex);
2354
76c75b25 2355 return -1;
a95cadb9 2356 }
aef9ec39 2357
19081f31
DD		 2358 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
2359 DMA_TO_DEVICE);
aef9ec39
RD		 2360 tsk_mgmt = iu->buf;
2361 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2362
2363 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 2364 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
2365 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 2366 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 2367 tsk_mgmt->task_tag = req_tag;
aef9ec39 2368
19081f31
DD		 2369 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2370 DMA_TO_DEVICE);
509c07bc
BVA		 2371 if (srp_post_send(ch, iu, sizeof(*tsk_mgmt))) {
2372 srp_put_tx_iu(ch, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 2373 mutex_unlock(&rport->mutex);
2374
76c75b25
BVA		 2375 return -1;
2376 }
a95cadb9 2377 mutex_unlock(&rport->mutex);
d945e1df 2378
509c07bc 2379 if (!wait_for_completion_timeout(&ch->tsk_mgmt_done,
aef9ec39 2380 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 2381 return -1;
aef9ec39 2382
d945e1df 2383 return 0;
d945e1df
RD		 2384}
2385
aef9ec39
RD		 2386static int srp_abort(struct scsi_cmnd *scmnd)
2387{
d945e1df 2388 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 2389 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
509c07bc 2390 struct srp_rdma_ch *ch;
086f44f5 2391 int ret;
d945e1df 2392
7aa54bd7 2393 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 2394
509c07bc
BVA		 2395 ch = &target->ch;
2396 if (!req || !srp_claim_req(ch, req, NULL, scmnd))
99b6697a 2397 return SUCCESS;
509c07bc 2398 if (srp_send_tsk_mgmt(ch, req->index, scmnd->device->lun,
80d5e8a2 2399 SRP_TSK_ABORT_TASK) == 0)
086f44f5 2400 ret = SUCCESS;
ed9b2264 2401 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 2402 ret = FAST_IO_FAIL;
086f44f5
BVA		 2403 else
2404 ret = FAILED;
509c07bc 2405 srp_free_req(ch, req, scmnd, 0);
22032991 2406 scmnd->result = DID_ABORT << 16;
d8536670 2407 scmnd->scsi_done(scmnd);
d945e1df 2408
086f44f5 2409 return ret;
aef9ec39
RD		 2410}
2411
2412static int srp_reset_device(struct scsi_cmnd *scmnd)
2413{
d945e1df 2414 struct srp_target_port *target = host_to_target(scmnd->device->host);
509c07bc 2415 struct srp_rdma_ch *ch = &target->ch;
536ae14e 2416 int i;
d945e1df 2417
7aa54bd7 2418 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 2419
509c07bc 2420 if (srp_send_tsk_mgmt(ch, SRP_TAG_NO_REQ, scmnd->device->lun,
f8b6e31e 2421 SRP_TSK_LUN_RESET))
d945e1df 2422 return FAILED;
509c07bc 2423 if (ch->tsk_mgmt_status)
d945e1df
RD		 2424 return FAILED;
2425
4d73f95f 2426 for (i = 0; i < target->req_ring_size; ++i) {
509c07bc
BVA		 2427 struct srp_request *req = &ch->req_ring[i];
2428
2429 srp_finish_req(ch, req, scmnd->device, DID_RESET << 16);
536ae14e 2430 }
d945e1df 2431
d945e1df 2432 return SUCCESS;
aef9ec39
RD		 2433}
2434
2435static int srp_reset_host(struct scsi_cmnd *scmnd)
2436{
2437 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 2438
7aa54bd7 2439 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 2440
ed9b2264 2441 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 2442}
2443
c9b03c1a
BVA		 2444static int srp_slave_configure(struct scsi_device *sdev)
2445{
2446 struct Scsi_Host *shost = sdev->host;
2447 struct srp_target_port *target = host_to_target(shost);
2448 struct request_queue *q = sdev->request_queue;
2449 unsigned long timeout;
2450
2451 if (sdev->type == TYPE_DISK) {
2452 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2453 blk_queue_rq_timeout(q, timeout);
2454 }
2455
2456 return 0;
2457}
2458
ee959b00
TJ		 2459static ssize_t show_id_ext(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%016llx\n",
2465 (unsigned long long) be64_to_cpu(target->id_ext));
2466}
2467
ee959b00
TJ		 2468static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2469 char *buf)
6ecb0c84 2470{
ee959b00 2471 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2472
6ecb0c84
RD		 2473 return sprintf(buf, "0x%016llx\n",
2474 (unsigned long long) be64_to_cpu(target->ioc_guid));
2475}
2476
ee959b00
TJ		 2477static ssize_t show_service_id(struct device *dev,
2478 struct device_attribute *attr, char *buf)
6ecb0c84 2479{
ee959b00 2480 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2481
6ecb0c84
RD		 2482 return sprintf(buf, "0x%016llx\n",
2483 (unsigned long long) be64_to_cpu(target->service_id));
2484}
2485
ee959b00
TJ		 2486static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2487 char *buf)
6ecb0c84 2488{
ee959b00 2489 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2490
747fe000 2491 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->pkey));
6ecb0c84
RD		 2492}
2493
848b3082
BVA		 2494static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2495 char *buf)
2496{
2497 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2498
747fe000 2499 return sprintf(buf, "%pI6\n", target->sgid.raw);
848b3082
BVA		 2500}
2501
ee959b00
TJ		 2502static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2503 char *buf)
6ecb0c84 2504{
ee959b00 2505 struct srp_target_port *target = host_to_target(class_to_shost(dev));
509c07bc 2506 struct srp_rdma_ch *ch = &target->ch;
6ecb0c84 2507
509c07bc 2508 return sprintf(buf, "%pI6\n", ch->path.dgid.raw);
6ecb0c84
RD		 2509}
2510
ee959b00
TJ		 2511static ssize_t show_orig_dgid(struct device *dev,
2512 struct device_attribute *attr, char *buf)
3633b3d0 2513{
ee959b00 2514 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 2515
747fe000 2516 return sprintf(buf, "%pI6\n", target->orig_dgid.raw);
3633b3d0
IR		 2517}
2518
89de7486
BVA		 2519static ssize_t show_req_lim(struct device *dev,
2520 struct device_attribute *attr, char *buf)
2521{
2522 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2523
509c07bc 2524 return sprintf(buf, "%d\n", target->ch.req_lim);
89de7486
BVA		 2525}
2526
ee959b00
TJ		 2527static ssize_t show_zero_req_lim(struct device *dev,
2528 struct device_attribute *attr, char *buf)
6bfa24fa 2529{
ee959b00 2530 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 2531
6bfa24fa
RD		 2532 return sprintf(buf, "%d\n", target->zero_req_lim);
2533}
2534
ee959b00
TJ		 2535static ssize_t show_local_ib_port(struct device *dev,
2536 struct device_attribute *attr, char *buf)
ded7f1a1 2537{
ee959b00 2538 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2539
2540 return sprintf(buf, "%d\n", target->srp_host->port);
2541}
2542
ee959b00
TJ		 2543static ssize_t show_local_ib_device(struct device *dev,
2544 struct device_attribute *attr, char *buf)
ded7f1a1 2545{
ee959b00 2546 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2547
05321937 2548 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2549}
2550
4b5e5f41
BVA		 2551static ssize_t show_comp_vector(struct device *dev,
2552 struct device_attribute *attr, char *buf)
2553{
2554 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2555
2556 return sprintf(buf, "%d\n", target->comp_vector);
2557}
2558
7bb312e4
VP		 2559static ssize_t show_tl_retry_count(struct device *dev,
2560 struct device_attribute *attr, char *buf)
2561{
2562 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2563
2564 return sprintf(buf, "%d\n", target->tl_retry_count);
2565}
2566
49248644
DD		 2567static ssize_t show_cmd_sg_entries(struct device *dev,
2568 struct device_attribute *attr, char *buf)
2569{
2570 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2571
2572 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2573}
2574
c07d424d
DD		 2575static ssize_t show_allow_ext_sg(struct device *dev,
2576 struct device_attribute *attr, char *buf)
2577{
2578 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2579
2580 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2581}
2582
ee959b00
TJ		 2583static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2584static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2585static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2586static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
848b3082 2587static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
ee959b00
TJ		 2588static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2589static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2590static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2591static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2592static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2593static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2594static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2595static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2596static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2597static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2598
2599static struct device_attribute *srp_host_attrs[] = {
2600 &dev_attr_id_ext,
2601 &dev_attr_ioc_guid,
2602 &dev_attr_service_id,
2603 &dev_attr_pkey,
848b3082 2604 &dev_attr_sgid,
ee959b00
TJ		 2605 &dev_attr_dgid,
2606 &dev_attr_orig_dgid,
89de7486 2607 &dev_attr_req_lim,
ee959b00
TJ		 2608 &dev_attr_zero_req_lim,
2609 &dev_attr_local_ib_port,
2610 &dev_attr_local_ib_device,
4b5e5f41 2611 &dev_attr_comp_vector,
7bb312e4 2612 &dev_attr_tl_retry_count,
49248644 2613 &dev_attr_cmd_sg_entries,
c07d424d 2614 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2615 NULL
2616};
2617
aef9ec39
RD		 2618static struct scsi_host_template srp_template = {
2619 .module = THIS_MODULE,
b7f008fd
RD		 2620 .name = "InfiniBand SRP initiator",
2621 .proc_name = DRV_NAME,
c9b03c1a 2622 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2623 .info = srp_target_info,
2624 .queuecommand = srp_queuecommand,
71444b97 2625 .change_queue_depth = srp_change_queue_depth,
a62182f3 2626 .change_queue_type = scsi_change_queue_type,
aef9ec39
RD		 2627 .eh_abort_handler = srp_abort,
2628 .eh_device_reset_handler = srp_reset_device,
2629 .eh_host_reset_handler = srp_reset_host,
2742c1da 2630 .skip_settle_delay = true,
49248644 2631 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
4d73f95f 2632 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
aef9ec39 2633 .this_id = -1,
4d73f95f 2634 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
6ecb0c84
RD		 2635 .use_clustering = ENABLE_CLUSTERING,
2636 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2637};
2638
34aa654e
BVA		 2639static int srp_sdev_count(struct Scsi_Host *host)
2640{
2641 struct scsi_device *sdev;
2642 int c = 0;
2643
2644 shost_for_each_device(sdev, host)
2645 c++;
2646
2647 return c;
2648}
2649
aef9ec39
RD		 2650static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2651{
3236822b
FT		 2652 struct srp_rport_identifiers ids;
2653 struct srp_rport *rport;
2654
34aa654e 2655 target->state = SRP_TARGET_SCANNING;
aef9ec39
RD		 2656 sprintf(target->target_name, "SRP.T10:%016llX",
2657 (unsigned long long) be64_to_cpu(target->id_ext));
2658
05321937 2659 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2660 return -ENODEV;
2661
3236822b
FT		 2662 memcpy(ids.port_id, &target->id_ext, 8);
2663 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2664 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2665 rport = srp_rport_add(target->scsi_host, &ids);
2666 if (IS_ERR(rport)) {
2667 scsi_remove_host(target->scsi_host);
2668 return PTR_ERR(rport);
2669 }
2670
dc1bdbd9 2671 rport->lld_data = target;
9dd69a60 2672 target->rport = rport;
dc1bdbd9 2673
b3589fd4 2674 spin_lock(&host->target_lock);
aef9ec39 2675 list_add_tail(&target->list, &host->target_list);
b3589fd4 2676 spin_unlock(&host->target_lock);
aef9ec39 2677
aef9ec39 2678 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2679 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39 2680
34aa654e
BVA		 2681 if (!target->connected || target->qp_in_error) {
2682 shost_printk(KERN_INFO, target->scsi_host,
2683 PFX "SCSI scan failed - removing SCSI host\n");
2684 srp_queue_remove_work(target);
2685 goto out;
2686 }
2687
2688 pr_debug(PFX "%s: SCSI scan succeeded - detected %d LUNs\n",
2689 dev_name(&target->scsi_host->shost_gendev),
2690 srp_sdev_count(target->scsi_host));
2691
2692 spin_lock_irq(&target->lock);
2693 if (target->state == SRP_TARGET_SCANNING)
2694 target->state = SRP_TARGET_LIVE;
2695 spin_unlock_irq(&target->lock);
2696
2697out:
aef9ec39
RD		 2698 return 0;
2699}
2700
ee959b00 2701static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2702{
2703 struct srp_host *host =
ee959b00 2704 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2705
2706 complete(&host->released);
2707}
2708
2709static struct class srp_class = {
2710 .name = "infiniband_srp",
ee959b00 2711 .dev_release = srp_release_dev
aef9ec39
RD		 2712};
2713
96fc248a
BVA		 2714/**
2715 * srp_conn_unique() - check whether the connection to a target is unique
af24663b
BVA		 2716 * @host: SRP host.
2717 * @target: SRP target port.
96fc248a
BVA		 2718 */
2719static bool srp_conn_unique(struct srp_host *host,
2720 struct srp_target_port *target)
2721{
2722 struct srp_target_port *t;
2723 bool ret = false;
2724
2725 if (target->state == SRP_TARGET_REMOVED)
2726 goto out;
2727
2728 ret = true;
2729
2730 spin_lock(&host->target_lock);
2731 list_for_each_entry(t, &host->target_list, list) {
2732 if (t != target &&
2733 target->id_ext == t->id_ext &&
2734 target->ioc_guid == t->ioc_guid &&
2735 target->initiator_ext == t->initiator_ext) {
2736 ret = false;
2737 break;
2738 }
2739 }
2740 spin_unlock(&host->target_lock);
2741
2742out:
2743 return ret;
2744}
2745
aef9ec39
RD		 2746/*
2747 * Target ports are added by writing
2748 *
2749 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2750 * pkey=<P_Key>,service_id=<service ID>
2751 *
2752 * to the add_target sysfs attribute.
2753 */
2754enum {
2755 SRP_OPT_ERR = 0,
2756 SRP_OPT_ID_EXT = 1 << 0,
2757 SRP_OPT_IOC_GUID = 1 << 1,
2758 SRP_OPT_DGID = 1 << 2,
2759 SRP_OPT_PKEY = 1 << 3,
2760 SRP_OPT_SERVICE_ID = 1 << 4,
2761 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2762 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2763 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2764 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2765 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2766 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2767 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2768 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2769 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
4d73f95f 2770 SRP_OPT_QUEUE_SIZE = 1 << 14,
aef9ec39
RD		 2771 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2772 SRP_OPT_IOC_GUID |
2773 SRP_OPT_DGID |
2774 SRP_OPT_PKEY |
2775 SRP_OPT_SERVICE_ID),
2776};
2777
a447c093 2778static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2779 { SRP_OPT_ID_EXT, "id_ext=%s" },
2780 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2781 { SRP_OPT_DGID, "dgid=%s" },
2782 { SRP_OPT_PKEY, "pkey=%x" },
2783 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2784 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2785 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2786 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2787 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2788 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2789 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2790 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2791 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2792 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
4d73f95f 2793 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
52fb2b50 2794 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2795};
2796
2797static int srp_parse_options(const char *buf, struct srp_target_port *target)
2798{
2799 char *options, *sep_opt;
2800 char *p;
2801 char dgid[3];
2802 substring_t args[MAX_OPT_ARGS];
2803 int opt_mask = 0;
2804 int token;
2805 int ret = -EINVAL;
2806 int i;
2807
2808 options = kstrdup(buf, GFP_KERNEL);
2809 if (!options)
2810 return -ENOMEM;
2811
2812 sep_opt = options;
2813 while ((p = strsep(&sep_opt, ",")) != NULL) {
2814 if (!*p)
2815 continue;
2816
2817 token = match_token(p, srp_opt_tokens, args);
2818 opt_mask |= token;
2819
2820 switch (token) {
2821 case SRP_OPT_ID_EXT:
2822 p = match_strdup(args);
a20f3a6d
IR		 2823 if (!p) {
2824 ret = -ENOMEM;
2825 goto out;
2826 }
aef9ec39
RD		 2827 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2828 kfree(p);
2829 break;
2830
2831 case SRP_OPT_IOC_GUID:
2832 p = match_strdup(args);
a20f3a6d
IR		 2833 if (!p) {
2834 ret = -ENOMEM;
2835 goto out;
2836 }
aef9ec39
RD		 2837 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2838 kfree(p);
2839 break;
2840
2841 case SRP_OPT_DGID:
2842 p = match_strdup(args);
a20f3a6d
IR		 2843 if (!p) {
2844 ret = -ENOMEM;
2845 goto out;
2846 }
aef9ec39 2847 if (strlen(p) != 32) {
e0bda7d8 2848 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2849 kfree(p);
aef9ec39
RD		 2850 goto out;
2851 }
2852
2853 for (i = 0; i < 16; ++i) {
747fe000
BVA		 2854 strlcpy(dgid, p + i * 2, sizeof(dgid));
2855 if (sscanf(dgid, "%hhx",
2856 &target->orig_dgid.raw[i]) < 1) {
2857 ret = -EINVAL;
2858 kfree(p);
2859 goto out;
2860 }
aef9ec39 2861 }
bf17c1c7 2862 kfree(p);
aef9ec39
RD		 2863 break;
2864
2865 case SRP_OPT_PKEY:
2866 if (match_hex(args, &token)) {
e0bda7d8 2867 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2868 goto out;
2869 }
747fe000 2870 target->pkey = cpu_to_be16(token);
aef9ec39
RD		 2871 break;
2872
2873 case SRP_OPT_SERVICE_ID:
2874 p = match_strdup(args);
a20f3a6d
IR		 2875 if (!p) {
2876 ret = -ENOMEM;
2877 goto out;
2878 }
aef9ec39
RD		 2879 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2880 kfree(p);
2881 break;
2882
2883 case SRP_OPT_MAX_SECT:
2884 if (match_int(args, &token)) {
e0bda7d8 2885 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2886 goto out;
2887 }
2888 target->scsi_host->max_sectors = token;
2889 break;
2890
4d73f95f
BVA		 2891 case SRP_OPT_QUEUE_SIZE:
2892 if (match_int(args, &token) || token < 1) {
2893 pr_warn("bad queue_size parameter '%s'\n", p);
2894 goto out;
2895 }
2896 target->scsi_host->can_queue = token;
2897 target->queue_size = token + SRP_RSP_SQ_SIZE +
2898 SRP_TSK_MGMT_SQ_SIZE;
2899 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2900 target->scsi_host->cmd_per_lun = token;
2901 break;
2902
52fb2b50 2903 case SRP_OPT_MAX_CMD_PER_LUN:
4d73f95f 2904 if (match_int(args, &token) || token < 1) {
e0bda7d8
BVA		 2905 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2906 p);
52fb2b50
VP		 2907 goto out;
2908 }
4d73f95f 2909 target->scsi_host->cmd_per_lun = token;
52fb2b50
VP		 2910 break;
2911
0c0450db
R		 2912 case SRP_OPT_IO_CLASS:
2913 if (match_hex(args, &token)) {
e0bda7d8 2914 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2915 goto out;
2916 }
2917 if (token != SRP_REV10_IB_IO_CLASS &&
2918 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2919 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2920 token, SRP_REV10_IB_IO_CLASS,
2921 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2922 goto out;
2923 }
2924 target->io_class = token;
2925 break;
2926
01cb9bcb
IR		 2927 case SRP_OPT_INITIATOR_EXT:
2928 p = match_strdup(args);
a20f3a6d
IR		 2929 if (!p) {
2930 ret = -ENOMEM;
2931 goto out;
2932 }
01cb9bcb
IR		 2933 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2934 kfree(p);
2935 break;
2936
49248644
DD		 2937 case SRP_OPT_CMD_SG_ENTRIES:
2938 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2939 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2940 p);
49248644
DD		 2941 goto out;
2942 }
2943 target->cmd_sg_cnt = token;
2944 break;
2945
c07d424d
DD		 2946 case SRP_OPT_ALLOW_EXT_SG:
2947 if (match_int(args, &token)) {
e0bda7d8 2948 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2949 goto out;
2950 }
2951 target->allow_ext_sg = !!token;
2952 break;
2953
2954 case SRP_OPT_SG_TABLESIZE:
2955 if (match_int(args, &token) || token < 1 ||
2956 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2957 pr_warn("bad max sg_tablesize parameter '%s'\n",
2958 p);
c07d424d
DD		 2959 goto out;
2960 }
2961 target->sg_tablesize = token;
2962 break;
2963
4b5e5f41
BVA		 2964 case SRP_OPT_COMP_VECTOR:
2965 if (match_int(args, &token) || token < 0) {
2966 pr_warn("bad comp_vector parameter '%s'\n", p);
2967 goto out;
2968 }
2969 target->comp_vector = token;
2970 break;
2971
7bb312e4
VP		 2972 case SRP_OPT_TL_RETRY_COUNT:
2973 if (match_int(args, &token) || token < 2 || token > 7) {
2974 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2975 p);
2976 goto out;
2977 }
2978 target->tl_retry_count = token;
2979 break;
2980
aef9ec39 2981 default:
e0bda7d8
BVA		 2982 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2983 p);
aef9ec39
RD		 2984 goto out;
2985 }
2986 }
2987
2988 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2989 ret = 0;
2990 else
2991 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2992 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2993 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2994 pr_warn("target creation request is missing parameter '%s'\n",
2995 srp_opt_tokens[i].pattern);
aef9ec39 2996
4d73f95f
BVA		 2997 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2998 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2999 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
3000 target->scsi_host->cmd_per_lun,
3001 target->scsi_host->can_queue);
3002
aef9ec39
RD		 3003out:
3004 kfree(options);
3005 return ret;
3006}
3007
ee959b00
TJ		 3008static ssize_t srp_create_target(struct device *dev,
3009 struct device_attribute *attr,
aef9ec39
RD		 3010 const char *buf, size_t count)
3011{
3012 struct srp_host *host =
ee959b00 3013 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 3014 struct Scsi_Host *target_host;
3015 struct srp_target_port *target;
509c07bc 3016 struct srp_rdma_ch *ch;
d1b4289e
BVA		 3017 struct srp_device *srp_dev = host->srp_dev;
3018 struct ib_device *ibdev = srp_dev->dev;
b81d00bd 3019 int ret;
aef9ec39
RD		 3020
3021 target_host = scsi_host_alloc(&srp_template,
3022 sizeof (struct srp_target_port));
3023 if (!target_host)
3024 return -ENOMEM;
3025
49248644 3026 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 3027 target_host->max_channel = 0;
3028 target_host->max_id = 1;
3c8edf0e
AR		 3029 target_host->max_lun = SRP_MAX_LUN;
3030 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 3031
aef9ec39 3032 target = host_to_target(target_host);
aef9ec39 3033
49248644
DD		 3034 target->io_class = SRP_REV16A_IB_IO_CLASS;
3035 target->scsi_host = target_host;
3036 target->srp_host = host;
3037 target->lkey = host->srp_dev->mr->lkey;
3038 target->rkey = host->srp_dev->mr->rkey;
3039 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 3040 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
3041 target->allow_ext_sg = allow_ext_sg;
7bb312e4 3042 target->tl_retry_count = 7;
4d73f95f 3043 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
aef9ec39 3044
34aa654e
BVA		 3045 /*
3046 * Avoid that the SCSI host can be removed by srp_remove_target()
3047 * before this function returns.
3048 */
3049 scsi_host_get(target->scsi_host);
3050
2d7091bc
BVA		 3051 mutex_lock(&host->add_target_mutex);
3052
aef9ec39
RD		 3053 ret = srp_parse_options(buf, target);
3054 if (ret)
3055 goto err;
3056
4d73f95f
BVA		 3057 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
3058
96fc248a
BVA		 3059 if (!srp_conn_unique(target->srp_host, target)) {
3060 shost_printk(KERN_INFO, target->scsi_host,
3061 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
3062 be64_to_cpu(target->id_ext),
3063 be64_to_cpu(target->ioc_guid),
3064 be64_to_cpu(target->initiator_ext));
3065 ret = -EEXIST;
3066 goto err;
3067 }
3068
5cfb1782 3069 if (!srp_dev->has_fmr && !srp_dev->has_fr && !target->allow_ext_sg &&
d1b4289e 3070 target->cmd_sg_cnt < target->sg_tablesize) {
5cfb1782 3071 pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 3072 target->sg_tablesize = target->cmd_sg_cnt;
3073 }
3074
3075 target_host->sg_tablesize = target->sg_tablesize;
3076 target->indirect_size = target->sg_tablesize *
3077 sizeof (struct srp_direct_buf);
49248644
DD		 3078 target->max_iu_len = sizeof (struct srp_cmd) +
3079 sizeof (struct srp_indirect_buf) +
3080 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
3081
c1120f89 3082 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 3083 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff 3084 spin_lock_init(&target->lock);
509c07bc
BVA		 3085 ch = &target->ch;
3086 ch->target = target;
3087 ch->comp_vector = target->comp_vector;
3088 spin_lock_init(&ch->lock);
3089 INIT_LIST_HEAD(&ch->free_tx);
3090 ret = srp_alloc_req_data(ch);
b81d00bd
BVA		 3091 if (ret)
3092 goto err_free_mem;
8f26c9ff 3093
747fe000 3094 ret = ib_query_gid(ibdev, host->port, 0, &target->sgid);
2088ca66
SG		 3095 if (ret)
3096 goto err_free_mem;
aef9ec39 3097
509c07bc 3098 ret = srp_create_ch_ib(ch);
aef9ec39 3099 if (ret)
8f26c9ff 3100 goto err_free_mem;
aef9ec39 3101
509c07bc 3102 ret = srp_new_cm_id(ch);
9fe4bcf4 3103 if (ret)
8f26c9ff 3104 goto err_free_ib;
aef9ec39 3105
509c07bc 3106 ret = srp_connect_ch(ch);
aef9ec39 3107 if (ret) {
7aa54bd7
DD		 3108 shost_printk(KERN_ERR, target->scsi_host,
3109 PFX "Connection failed\n");
394c595e 3110 goto err_free_ib;
aef9ec39
RD		 3111 }
3112
3113 ret = srp_add_target(host, target);
3114 if (ret)
3115 goto err_disconnect;
3116
34aa654e
BVA		 3117 if (target->state != SRP_TARGET_REMOVED) {
3118 shost_printk(KERN_DEBUG, target->scsi_host, PFX
3119 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
3120 be64_to_cpu(target->id_ext),
3121 be64_to_cpu(target->ioc_guid),
747fe000 3122 be16_to_cpu(target->pkey),
34aa654e 3123 be64_to_cpu(target->service_id),
747fe000 3124 target->sgid.raw, target->orig_dgid.raw);
34aa654e 3125 }
e7ffde01 3126
2d7091bc
BVA		 3127 ret = count;
3128
3129out:
3130 mutex_unlock(&host->add_target_mutex);
34aa654e
BVA		 3131
3132 scsi_host_put(target->scsi_host);
3133
2d7091bc 3134 return ret;
aef9ec39
RD		 3135
3136err_disconnect:
3137 srp_disconnect_target(target);
3138
8f26c9ff 3139err_free_ib:
509c07bc 3140 srp_free_ch_ib(target, ch);
aef9ec39 3141
8f26c9ff 3142err_free_mem:
509c07bc 3143 srp_free_req_data(target, ch);
8f26c9ff 3144
aef9ec39
RD		 3145err:
3146 scsi_host_put(target_host);
2d7091bc 3147 goto out;
aef9ec39
RD		 3148}
3149
ee959b00 3150static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 3151
ee959b00
TJ		 3152static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
3153 char *buf)
aef9ec39 3154{
ee959b00 3155 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 3156
05321937 3157 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 3158}
3159
ee959b00 3160static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 3161
ee959b00
TJ		 3162static ssize_t show_port(struct device *dev, struct device_attribute *attr,
3163 char *buf)
aef9ec39 3164{
ee959b00 3165 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 3166
3167 return sprintf(buf, "%d\n", host->port);
3168}
3169
ee959b00 3170static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 3171
f5358a17 3172static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 3173{
3174 struct srp_host *host;
3175
3176 host = kzalloc(sizeof *host, GFP_KERNEL);
3177 if (!host)
3178 return NULL;
3179
3180 INIT_LIST_HEAD(&host->target_list);
b3589fd4 3181 spin_lock_init(&host->target_lock);
aef9ec39 3182 init_completion(&host->released);
2d7091bc 3183 mutex_init(&host->add_target_mutex);
05321937 3184 host->srp_dev = device;
aef9ec39
RD		 3185 host->port = port;
3186
ee959b00
TJ		 3187 host->dev.class = &srp_class;
3188 host->dev.parent = device->dev->dma_device;
d927e38c 3189 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 3190
ee959b00 3191 if (device_register(&host->dev))
f5358a17 3192 goto free_host;
ee959b00 3193 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 3194 goto err_class;
ee959b00 3195 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 3196 goto err_class;
ee959b00 3197 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 3198 goto err_class;
3199
3200 return host;
3201
3202err_class:
ee959b00 3203 device_unregister(&host->dev);
aef9ec39 3204
f5358a17 3205free_host:
aef9ec39
RD		 3206 kfree(host);
3207
3208 return NULL;
3209}
3210
3211static void srp_add_one(struct ib_device *device)
3212{
f5358a17
RD		 3213 struct srp_device *srp_dev;
3214 struct ib_device_attr *dev_attr;
aef9ec39 3215 struct srp_host *host;
52ede08f
BVA		 3216 int mr_page_shift, s, e, p;
3217 u64 max_pages_per_mr;
aef9ec39 3218
f5358a17
RD		 3219 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
3220 if (!dev_attr)
cf311cd4 3221 return;
aef9ec39 3222
f5358a17 3223 if (ib_query_device(device, dev_attr)) {
e0bda7d8 3224 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 3225 goto free_attr;
3226 }
3227
3228 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
3229 if (!srp_dev)
3230 goto free_attr;
3231
d1b4289e
BVA		 3232 srp_dev->has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
3233 device->map_phys_fmr && device->unmap_fmr);
5cfb1782
BVA		 3234 srp_dev->has_fr = (dev_attr->device_cap_flags &
3235 IB_DEVICE_MEM_MGT_EXTENSIONS);
3236 if (!srp_dev->has_fmr && !srp_dev->has_fr)
3237 dev_warn(&device->dev, "neither FMR nor FR is supported\n");
3238
3239 srp_dev->use_fast_reg = (srp_dev->has_fr &&
3240 (!srp_dev->has_fmr || prefer_fr));
d1b4289e 3241
f5358a17
RD		 3242 /*
3243 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 3244 * minimum of 4096 bytes. We're unlikely to build large sglists
3245 * out of smaller entries.
f5358a17 3246 */
52ede08f
BVA		 3247 mr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
3248 srp_dev->mr_page_size = 1 << mr_page_shift;
3249 srp_dev->mr_page_mask = ~((u64) srp_dev->mr_page_size - 1);
3250 max_pages_per_mr = dev_attr->max_mr_size;
3251 do_div(max_pages_per_mr, srp_dev->mr_page_size);
3252 srp_dev->max_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR,
3253 max_pages_per_mr);
5cfb1782
BVA		 3254 if (srp_dev->use_fast_reg) {
3255 srp_dev->max_pages_per_mr =
3256 min_t(u32, srp_dev->max_pages_per_mr,
3257 dev_attr->max_fast_reg_page_list_len);
3258 }
52ede08f
BVA		 3259 srp_dev->mr_max_size = srp_dev->mr_page_size *
3260 srp_dev->max_pages_per_mr;
5cfb1782 3261 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 3262 device->name, mr_page_shift, dev_attr->max_mr_size,
5cfb1782 3263 dev_attr->max_fast_reg_page_list_len,
52ede08f 3264 srp_dev->max_pages_per_mr, srp_dev->mr_max_size);
f5358a17
RD		 3265
3266 INIT_LIST_HEAD(&srp_dev->dev_list);
3267
3268 srp_dev->dev = device;
3269 srp_dev->pd = ib_alloc_pd(device);
3270 if (IS_ERR(srp_dev->pd))
3271 goto free_dev;
3272
3273 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
3274 IB_ACCESS_LOCAL_WRITE |
3275 IB_ACCESS_REMOTE_READ |
3276 IB_ACCESS_REMOTE_WRITE);
3277 if (IS_ERR(srp_dev->mr))
3278 goto err_pd;
3279
07ebafba 3280 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 3281 s = 0;
3282 e = 0;
3283 } else {
3284 s = 1;
3285 e = device->phys_port_cnt;
3286 }
3287
3288 for (p = s; p <= e; ++p) {
f5358a17 3289 host = srp_add_port(srp_dev, p);
aef9ec39 3290 if (host)
f5358a17 3291 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 3292 }
3293
f5358a17
RD		 3294 ib_set_client_data(device, &srp_client, srp_dev);
3295
3296 goto free_attr;
3297
3298err_pd:
3299 ib_dealloc_pd(srp_dev->pd);
3300
3301free_dev:
3302 kfree(srp_dev);
3303
3304free_attr:
3305 kfree(dev_attr);
aef9ec39
RD		 3306}
3307
3308static void srp_remove_one(struct ib_device *device)
3309{
f5358a17 3310 struct srp_device *srp_dev;
aef9ec39 3311 struct srp_host *host, *tmp_host;
ef6c49d8 3312 struct srp_target_port *target;
aef9ec39 3313
f5358a17 3314 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 3315 if (!srp_dev)
3316 return;
aef9ec39 3317
f5358a17 3318 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 3319 device_unregister(&host->dev);
aef9ec39
RD		 3320 /*
3321 * Wait for the sysfs entry to go away, so that no new
3322 * target ports can be created.
3323 */
3324 wait_for_completion(&host->released);
3325
3326 /*
ef6c49d8 3327 * Remove all target ports.
aef9ec39 3328 */
b3589fd4 3329 spin_lock(&host->target_lock);
ef6c49d8
BVA		 3330 list_for_each_entry(target, &host->target_list, list)
3331 srp_queue_remove_work(target);
b3589fd4 3332 spin_unlock(&host->target_lock);
aef9ec39
RD		 3333
3334 /*
bcc05910 3335 * Wait for tl_err and target port removal tasks.
aef9ec39 3336 */
ef6c49d8 3337 flush_workqueue(system_long_wq);
bcc05910 3338 flush_workqueue(srp_remove_wq);
aef9ec39 3339
aef9ec39
RD		 3340 kfree(host);
3341 }
3342
f5358a17
RD		 3343 ib_dereg_mr(srp_dev->mr);
3344 ib_dealloc_pd(srp_dev->pd);
3345
3346 kfree(srp_dev);
aef9ec39
RD		 3347}
3348
3236822b 3349static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 3350 .has_rport_state = true,
3351 .reset_timer_if_blocked = true,
a95cadb9 3352 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 3353 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
3354 .dev_loss_tmo = &srp_dev_loss_tmo,
3355 .reconnect = srp_rport_reconnect,
dc1bdbd9 3356 .rport_delete = srp_rport_delete,
ed9b2264 3357 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 3358};
3359
aef9ec39
RD		 3360static int __init srp_init_module(void)
3361{
3362 int ret;
3363
dcb4cb85 3364 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 3365
49248644 3366 if (srp_sg_tablesize) {
e0bda7d8 3367 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 3368 if (!cmd_sg_entries)
3369 cmd_sg_entries = srp_sg_tablesize;
3370 }
3371
3372 if (!cmd_sg_entries)
3373 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
3374
3375 if (cmd_sg_entries > 255) {
e0bda7d8 3376 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 3377 cmd_sg_entries = 255;
1e89a194
DD		 3378 }
3379
c07d424d
DD		 3380 if (!indirect_sg_entries)
3381 indirect_sg_entries = cmd_sg_entries;
3382 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 3383 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
3384 cmd_sg_entries);
c07d424d
DD		 3385 indirect_sg_entries = cmd_sg_entries;
3386 }
3387
bcc05910 3388 srp_remove_wq = create_workqueue("srp_remove");
da05be29
WY		 3389 if (!srp_remove_wq) {
3390 ret = -ENOMEM;
bcc05910
BVA		 3391 goto out;
3392 }
3393
3394 ret = -ENOMEM;
3236822b
FT		 3395 ib_srp_transport_template =
3396 srp_attach_transport(&ib_srp_transport_functions);
3397 if (!ib_srp_transport_template)
bcc05910 3398 goto destroy_wq;
3236822b 3399
aef9ec39
RD		 3400 ret = class_register(&srp_class);
3401 if (ret) {
e0bda7d8 3402 pr_err("couldn't register class infiniband_srp\n");
bcc05910 3403 goto release_tr;
aef9ec39
RD		 3404 }
3405
c1a0b23b
MT		 3406 ib_sa_register_client(&srp_sa_client);
3407
aef9ec39
RD		 3408 ret = ib_register_client(&srp_client);
3409 if (ret) {
e0bda7d8 3410 pr_err("couldn't register IB client\n");
bcc05910 3411 goto unreg_sa;
aef9ec39
RD		 3412 }
3413
bcc05910
BVA		 3414out:
3415 return ret;
3416
3417unreg_sa:
3418 ib_sa_unregister_client(&srp_sa_client);
3419 class_unregister(&srp_class);
3420
3421release_tr:
3422 srp_release_transport(ib_srp_transport_template);
3423
3424destroy_wq:
3425 destroy_workqueue(srp_remove_wq);
3426 goto out;
aef9ec39
RD		 3427}
3428
3429static void __exit srp_cleanup_module(void)
3430{
3431 ib_unregister_client(&srp_client);
c1a0b23b 3432 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 3433 class_unregister(&srp_class);
3236822b 3434 srp_release_transport(ib_srp_transport_template);
bcc05910 3435 destroy_workqueue(srp_remove_wq);
aef9ec39
RD		 3436}
3437
3438module_init(srp_init_module);
3439module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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