]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - drivers/infiniband/ulp/srp/ib_srp.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
IB/srp: Rename FMR-related variables
[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
aef9ec39
RD		 31 */
32
e0bda7d8
BVA		 33#define pr_fmt(fmt) PFX fmt
34
aef9ec39
RD		 35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/string.h>
40#include <linux/parser.h>
41#include <linux/random.h>
de25968c 42#include <linux/jiffies.h>
aef9ec39 43
60063497 44#include <linux/atomic.h>
aef9ec39
RD		 45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
71444b97 49#include <scsi/scsi_tcq.h>
aef9ec39 50#include <scsi/srp.h>
3236822b 51#include <scsi/scsi_transport_srp.h>
aef9ec39 52
aef9ec39
RD		 53#include "ib_srp.h"
54
55#define DRV_NAME "ib_srp"
56#define PFX DRV_NAME ": "
e8ca4135
VP		 57#define DRV_VERSION "1.0"
58#define DRV_RELDATE "July 1, 2013"
aef9ec39
RD		 59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
49248644
DD		 65static unsigned int srp_sg_tablesize;
66static unsigned int cmd_sg_entries;
c07d424d
DD		 67static unsigned int indirect_sg_entries;
68static bool allow_ext_sg;
b1b8854d 69static bool register_always;
49248644 70static int topspin_workarounds = 1;
74b0a15b 71
49248644
DD		 72module_param(srp_sg_tablesize, uint, 0444);
73MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
74b0a15b 74
49248644
DD		 75module_param(cmd_sg_entries, uint, 0444);
76MODULE_PARM_DESC(cmd_sg_entries,
77 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
aef9ec39 78
c07d424d
DD		 79module_param(indirect_sg_entries, uint, 0444);
80MODULE_PARM_DESC(indirect_sg_entries,
81 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
82
83module_param(allow_ext_sg, bool, 0444);
84MODULE_PARM_DESC(allow_ext_sg,
85 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
86
aef9ec39
RD		 87module_param(topspin_workarounds, int, 0444);
88MODULE_PARM_DESC(topspin_workarounds,
89 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
90
b1b8854d
BVA		 91module_param(register_always, bool, 0444);
92MODULE_PARM_DESC(register_always,
93 "Use memory registration even for contiguous memory regions");
94
ed9b2264
BVA		 95static struct kernel_param_ops srp_tmo_ops;
96
a95cadb9
BVA		 97static int srp_reconnect_delay = 10;
98module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
99 S_IRUGO | S_IWUSR);
100MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
101
ed9b2264
BVA		 102static int srp_fast_io_fail_tmo = 15;
103module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
104 S_IRUGO | S_IWUSR);
105MODULE_PARM_DESC(fast_io_fail_tmo,
106 "Number of seconds between the observation of a transport"
107 " layer error and failing all I/O. \"off\" means that this"
108 " functionality is disabled.");
109
a95cadb9 110static int srp_dev_loss_tmo = 600;
ed9b2264
BVA		 111module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
112 S_IRUGO | S_IWUSR);
113MODULE_PARM_DESC(dev_loss_tmo,
114 "Maximum number of seconds that the SRP transport should"
115 " insulate transport layer errors. After this time has been"
116 " exceeded the SCSI host is removed. Should be"
117 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
118 " if fast_io_fail_tmo has not been set. \"off\" means that"
119 " this functionality is disabled.");
120
aef9ec39
RD		 121static void srp_add_one(struct ib_device *device);
122static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 123static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
124static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 125static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
126
3236822b
FT		 127static struct scsi_transport_template *ib_srp_transport_template;
128
aef9ec39
RD		 129static struct ib_client srp_client = {
130 .name = "srp",
131 .add = srp_add_one,
132 .remove = srp_remove_one
133};
134
c1a0b23b
MT		 135static struct ib_sa_client srp_sa_client;
136
ed9b2264
BVA		 137static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
138{
139 int tmo = *(int *)kp->arg;
140
141 if (tmo >= 0)
142 return sprintf(buffer, "%d", tmo);
143 else
144 return sprintf(buffer, "off");
145}
146
147static int srp_tmo_set(const char *val, const struct kernel_param *kp)
148{
149 int tmo, res;
150
151 if (strncmp(val, "off", 3) != 0) {
152 res = kstrtoint(val, 0, &tmo);
153 if (res)
154 goto out;
155 } else {
156 tmo = -1;
157 }
a95cadb9
BVA		 158 if (kp->arg == &srp_reconnect_delay)
159 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
160 srp_dev_loss_tmo);
161 else if (kp->arg == &srp_fast_io_fail_tmo)
162 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
ed9b2264 163 else
a95cadb9
BVA		 164 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
165 tmo);
ed9b2264
BVA		 166 if (res)
167 goto out;
168 *(int *)kp->arg = tmo;
169
170out:
171 return res;
172}
173
174static struct kernel_param_ops srp_tmo_ops = {
175 .get = srp_tmo_get,
176 .set = srp_tmo_set,
177};
178
aef9ec39
RD		 179static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
180{
181 return (struct srp_target_port *) host->hostdata;
182}
183
184static const char *srp_target_info(struct Scsi_Host *host)
185{
186 return host_to_target(host)->target_name;
187}
188
5d7cbfd6
RD		 189static int srp_target_is_topspin(struct srp_target_port *target)
190{
191 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 192 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 193
194 return topspin_workarounds &&
3d1ff48d
RK		 195 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
196 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 197}
198
aef9ec39
RD		 199static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
200 gfp_t gfp_mask,
201 enum dma_data_direction direction)
202{
203 struct srp_iu *iu;
204
205 iu = kmalloc(sizeof *iu, gfp_mask);
206 if (!iu)
207 goto out;
208
209 iu->buf = kzalloc(size, gfp_mask);
210 if (!iu->buf)
211 goto out_free_iu;
212
05321937
GKH		 213 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
214 direction);
215 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 216 goto out_free_buf;
217
218 iu->size = size;
219 iu->direction = direction;
220
221 return iu;
222
223out_free_buf:
224 kfree(iu->buf);
225out_free_iu:
226 kfree(iu);
227out:
228 return NULL;
229}
230
231static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
232{
233 if (!iu)
234 return;
235
05321937
GKH		 236 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
237 iu->direction);
aef9ec39
RD		 238 kfree(iu->buf);
239 kfree(iu);
240}
241
242static void srp_qp_event(struct ib_event *event, void *context)
243{
e0bda7d8 244 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 245}
246
247static int srp_init_qp(struct srp_target_port *target,
248 struct ib_qp *qp)
249{
250 struct ib_qp_attr *attr;
251 int ret;
252
253 attr = kmalloc(sizeof *attr, GFP_KERNEL);
254 if (!attr)
255 return -ENOMEM;
256
969a60f9
RD		 257 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
258 target->srp_host->port,
259 be16_to_cpu(target->path.pkey),
260 &attr->pkey_index);
aef9ec39
RD		 261 if (ret)
262 goto out;
263
264 attr->qp_state = IB_QPS_INIT;
265 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
266 IB_ACCESS_REMOTE_WRITE);
267 attr->port_num = target->srp_host->port;
268
269 ret = ib_modify_qp(qp, attr,
270 IB_QP_STATE |
271 IB_QP_PKEY_INDEX |
272 IB_QP_ACCESS_FLAGS |
273 IB_QP_PORT);
274
275out:
276 kfree(attr);
277 return ret;
278}
279
9fe4bcf4
DD		 280static int srp_new_cm_id(struct srp_target_port *target)
281{
282 struct ib_cm_id *new_cm_id;
283
05321937 284 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 285 srp_cm_handler, target);
286 if (IS_ERR(new_cm_id))
287 return PTR_ERR(new_cm_id);
288
289 if (target->cm_id)
290 ib_destroy_cm_id(target->cm_id);
291 target->cm_id = new_cm_id;
292
293 return 0;
294}
295
d1b4289e
BVA		 296static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target)
297{
298 struct srp_device *dev = target->srp_host->srp_dev;
299 struct ib_fmr_pool_param fmr_param;
300
301 memset(&fmr_param, 0, sizeof(fmr_param));
302 fmr_param.pool_size = target->scsi_host->can_queue;
303 fmr_param.dirty_watermark = fmr_param.pool_size / 4;
304 fmr_param.cache = 1;
52ede08f
BVA		 305 fmr_param.max_pages_per_fmr = dev->max_pages_per_mr;
306 fmr_param.page_shift = ilog2(dev->mr_page_size);
d1b4289e
BVA		 307 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
308 IB_ACCESS_REMOTE_WRITE |
309 IB_ACCESS_REMOTE_READ);
310
311 return ib_create_fmr_pool(dev->pd, &fmr_param);
312}
313
aef9ec39
RD		 314static int srp_create_target_ib(struct srp_target_port *target)
315{
62154b2e 316 struct srp_device *dev = target->srp_host->srp_dev;
aef9ec39 317 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 318 struct ib_cq *recv_cq, *send_cq;
319 struct ib_qp *qp;
d1b4289e 320 struct ib_fmr_pool *fmr_pool = NULL;
aef9ec39
RD		 321 int ret;
322
323 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
324 if (!init_attr)
325 return -ENOMEM;
326
62154b2e 327 recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, target,
4d73f95f 328 target->queue_size, target->comp_vector);
73aa89ed
IR		 329 if (IS_ERR(recv_cq)) {
330 ret = PTR_ERR(recv_cq);
da9d2f07 331 goto err;
aef9ec39
RD		 332 }
333
62154b2e 334 send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, target,
4d73f95f 335 target->queue_size, target->comp_vector);
73aa89ed
IR		 336 if (IS_ERR(send_cq)) {
337 ret = PTR_ERR(send_cq);
da9d2f07 338 goto err_recv_cq;
9c03dc9f
BVA		 339 }
340
73aa89ed 341 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 342
343 init_attr->event_handler = srp_qp_event;
4d73f95f
BVA		 344 init_attr->cap.max_send_wr = target->queue_size;
345 init_attr->cap.max_recv_wr = target->queue_size;
aef9ec39
RD		 346 init_attr->cap.max_recv_sge = 1;
347 init_attr->cap.max_send_sge = 1;
348 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
349 init_attr->qp_type = IB_QPT_RC;
73aa89ed
IR		 350 init_attr->send_cq = send_cq;
351 init_attr->recv_cq = recv_cq;
aef9ec39 352
62154b2e 353 qp = ib_create_qp(dev->pd, init_attr);
73aa89ed
IR		 354 if (IS_ERR(qp)) {
355 ret = PTR_ERR(qp);
da9d2f07 356 goto err_send_cq;
aef9ec39
RD		 357 }
358
73aa89ed 359 ret = srp_init_qp(target, qp);
da9d2f07
RD		 360 if (ret)
361 goto err_qp;
aef9ec39 362
d1b4289e
BVA		 363 if (dev->has_fmr) {
364 fmr_pool = srp_alloc_fmr_pool(target);
365 if (IS_ERR(fmr_pool)) {
366 ret = PTR_ERR(fmr_pool);
367 shost_printk(KERN_WARNING, target->scsi_host, PFX
368 "FMR pool allocation failed (%d)\n", ret);
369 goto err_qp;
370 }
371 if (target->fmr_pool)
372 ib_destroy_fmr_pool(target->fmr_pool);
373 target->fmr_pool = fmr_pool;
374 }
375
73aa89ed
IR		 376 if (target->qp)
377 ib_destroy_qp(target->qp);
378 if (target->recv_cq)
379 ib_destroy_cq(target->recv_cq);
380 if (target->send_cq)
381 ib_destroy_cq(target->send_cq);
382
383 target->qp = qp;
384 target->recv_cq = recv_cq;
385 target->send_cq = send_cq;
386
da9d2f07
RD		 387 kfree(init_attr);
388 return 0;
389
390err_qp:
73aa89ed 391 ib_destroy_qp(qp);
da9d2f07
RD		 392
393err_send_cq:
73aa89ed 394 ib_destroy_cq(send_cq);
da9d2f07
RD		 395
396err_recv_cq:
73aa89ed 397 ib_destroy_cq(recv_cq);
da9d2f07
RD		 398
399err:
aef9ec39
RD		 400 kfree(init_attr);
401 return ret;
402}
403
4d73f95f
BVA		 404/*
405 * Note: this function may be called without srp_alloc_iu_bufs() having been
406 * invoked. Hence the target->[rt]x_ring checks.
407 */
aef9ec39
RD		 408static void srp_free_target_ib(struct srp_target_port *target)
409{
410 int i;
411
d1b4289e
BVA		 412 if (target->fmr_pool)
413 ib_destroy_fmr_pool(target->fmr_pool);
aef9ec39 414 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 415 ib_destroy_cq(target->send_cq);
416 ib_destroy_cq(target->recv_cq);
aef9ec39 417
73aa89ed
IR		 418 target->qp = NULL;
419 target->send_cq = target->recv_cq = NULL;
420
4d73f95f
BVA		 421 if (target->rx_ring) {
422 for (i = 0; i < target->queue_size; ++i)
423 srp_free_iu(target->srp_host, target->rx_ring[i]);
424 kfree(target->rx_ring);
425 target->rx_ring = NULL;
426 }
427 if (target->tx_ring) {
428 for (i = 0; i < target->queue_size; ++i)
429 srp_free_iu(target->srp_host, target->tx_ring[i]);
430 kfree(target->tx_ring);
431 target->tx_ring = NULL;
432 }
aef9ec39
RD		 433}
434
435static void srp_path_rec_completion(int status,
436 struct ib_sa_path_rec *pathrec,
437 void *target_ptr)
438{
439 struct srp_target_port *target = target_ptr;
440
441 target->status = status;
442 if (status)
7aa54bd7
DD		 443 shost_printk(KERN_ERR, target->scsi_host,
444 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 445 else
446 target->path = *pathrec;
447 complete(&target->done);
448}
449
450static int srp_lookup_path(struct srp_target_port *target)
451{
a702adce
BVA		 452 int ret;
453
aef9ec39
RD		 454 target->path.numb_path = 1;
455
456 init_completion(&target->done);
457
c1a0b23b 458 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 459 target->srp_host->srp_dev->dev,
aef9ec39
RD		 460 target->srp_host->port,
461 &target->path,
247e020e 462 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 463 IB_SA_PATH_REC_DGID |
464 IB_SA_PATH_REC_SGID |
465 IB_SA_PATH_REC_NUMB_PATH |
466 IB_SA_PATH_REC_PKEY,
467 SRP_PATH_REC_TIMEOUT_MS,
468 GFP_KERNEL,
469 srp_path_rec_completion,
470 target, &target->path_query);
471 if (target->path_query_id < 0)
472 return target->path_query_id;
473
a702adce
BVA		 474 ret = wait_for_completion_interruptible(&target->done);
475 if (ret < 0)
476 return ret;
aef9ec39
RD		 477
478 if (target->status < 0)
7aa54bd7
DD		 479 shost_printk(KERN_WARNING, target->scsi_host,
480 PFX "Path record query failed\n");
aef9ec39
RD		 481
482 return target->status;
483}
484
485static int srp_send_req(struct srp_target_port *target)
486{
487 struct {
488 struct ib_cm_req_param param;
489 struct srp_login_req priv;
490 } *req = NULL;
491 int status;
492
493 req = kzalloc(sizeof *req, GFP_KERNEL);
494 if (!req)
495 return -ENOMEM;
496
497 req->param.primary_path = &target->path;
498 req->param.alternate_path = NULL;
499 req->param.service_id = target->service_id;
500 req->param.qp_num = target->qp->qp_num;
501 req->param.qp_type = target->qp->qp_type;
502 req->param.private_data = &req->priv;
503 req->param.private_data_len = sizeof req->priv;
504 req->param.flow_control = 1;
505
506 get_random_bytes(&req->param.starting_psn, 4);
507 req->param.starting_psn &= 0xffffff;
508
509 /*
510 * Pick some arbitrary defaults here; we could make these
511 * module parameters if anyone cared about setting them.
512 */
513 req->param.responder_resources = 4;
514 req->param.remote_cm_response_timeout = 20;
515 req->param.local_cm_response_timeout = 20;
7bb312e4 516 req->param.retry_count = target->tl_retry_count;
aef9ec39
RD		 517 req->param.rnr_retry_count = 7;
518 req->param.max_cm_retries = 15;
519
520 req->priv.opcode = SRP_LOGIN_REQ;
521 req->priv.tag = 0;
49248644 522 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 523 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
524 SRP_BUF_FORMAT_INDIRECT);
0c0450db 525 /*
3cd96564 526 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 527 * port identifier format is 8 bytes of ID extension followed
528 * by 8 bytes of GUID. Older drafts put the two halves in the
529 * opposite order, so that the GUID comes first.
530 *
531 * Targets conforming to these obsolete drafts can be
532 * recognized by the I/O Class they report.
533 */
534 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
535 memcpy(req->priv.initiator_port_id,
01cb9bcb 536 &target->path.sgid.global.interface_id, 8);
0c0450db 537 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 538 &target->initiator_ext, 8);
0c0450db
R		 539 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
540 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
541 } else {
542 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 543 &target->initiator_ext, 8);
544 memcpy(req->priv.initiator_port_id + 8,
545 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 546 memcpy(req->priv.target_port_id, &target->id_ext, 8);
547 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
548 }
549
aef9ec39
RD		 550 /*
551 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 552 * zero out the first 8 bytes of our initiator port ID and set
553 * the second 8 bytes to the local node GUID.
aef9ec39 554 */
5d7cbfd6 555 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 556 shost_printk(KERN_DEBUG, target->scsi_host,
557 PFX "Topspin/Cisco initiator port ID workaround "
558 "activated for target GUID %016llx\n",
559 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 560 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 561 memcpy(req->priv.initiator_port_id + 8,
05321937 562 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 563 }
aef9ec39
RD		 564
565 status = ib_send_cm_req(target->cm_id, &req->param);
566
567 kfree(req);
568
569 return status;
570}
571
ef6c49d8
BVA		 572static bool srp_queue_remove_work(struct srp_target_port *target)
573{
574 bool changed = false;
575
576 spin_lock_irq(&target->lock);
577 if (target->state != SRP_TARGET_REMOVED) {
578 target->state = SRP_TARGET_REMOVED;
579 changed = true;
580 }
581 spin_unlock_irq(&target->lock);
582
583 if (changed)
584 queue_work(system_long_wq, &target->remove_work);
585
586 return changed;
587}
588
294c875a
BVA		 589static bool srp_change_conn_state(struct srp_target_port *target,
590 bool connected)
591{
592 bool changed = false;
593
594 spin_lock_irq(&target->lock);
595 if (target->connected != connected) {
596 target->connected = connected;
597 changed = true;
598 }
599 spin_unlock_irq(&target->lock);
600
601 return changed;
602}
603
aef9ec39
RD		 604static void srp_disconnect_target(struct srp_target_port *target)
605{
294c875a
BVA		 606 if (srp_change_conn_state(target, false)) {
607 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 608
294c875a
BVA		 609 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
610 shost_printk(KERN_DEBUG, target->scsi_host,
611 PFX "Sending CM DREQ failed\n");
294c875a 612 }
e6581056 613 }
aef9ec39
RD		 614}
615
8f26c9ff
DD		 616static void srp_free_req_data(struct srp_target_port *target)
617{
c07d424d 618 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
8f26c9ff
DD		 619 struct srp_request *req;
620 int i;
621
4d73f95f
BVA		 622 if (!target->req_ring)
623 return;
624
625 for (i = 0; i < target->req_ring_size; ++i) {
626 req = &target->req_ring[i];
8f26c9ff
DD		 627 kfree(req->fmr_list);
628 kfree(req->map_page);
c07d424d
DD		 629 if (req->indirect_dma_addr) {
630 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
631 target->indirect_size,
632 DMA_TO_DEVICE);
633 }
634 kfree(req->indirect_desc);
8f26c9ff 635 }
4d73f95f
BVA		 636
637 kfree(target->req_ring);
638 target->req_ring = NULL;
8f26c9ff
DD		 639}
640
b81d00bd
BVA		 641static int srp_alloc_req_data(struct srp_target_port *target)
642{
643 struct srp_device *srp_dev = target->srp_host->srp_dev;
644 struct ib_device *ibdev = srp_dev->dev;
645 struct srp_request *req;
646 dma_addr_t dma_addr;
647 int i, ret = -ENOMEM;
648
649 INIT_LIST_HEAD(&target->free_reqs);
650
4d73f95f
BVA		 651 target->req_ring = kzalloc(target->req_ring_size *
652 sizeof(*target->req_ring), GFP_KERNEL);
653 if (!target->req_ring)
654 goto out;
655
656 for (i = 0; i < target->req_ring_size; ++i) {
b81d00bd
BVA		 657 req = &target->req_ring[i];
658 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
659 GFP_KERNEL);
52ede08f 660 req->map_page = kmalloc(srp_dev->max_pages_per_mr *
d1b4289e 661 sizeof(void *), GFP_KERNEL);
b81d00bd
BVA		 662 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
663 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
664 goto out;
665
666 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
667 target->indirect_size,
668 DMA_TO_DEVICE);
669 if (ib_dma_mapping_error(ibdev, dma_addr))
670 goto out;
671
672 req->indirect_dma_addr = dma_addr;
673 req->index = i;
674 list_add_tail(&req->list, &target->free_reqs);
675 }
676 ret = 0;
677
678out:
679 return ret;
680}
681
683b159a
BVA		 682/**
683 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
684 * @shost: SCSI host whose attributes to remove from sysfs.
685 *
686 * Note: Any attributes defined in the host template and that did not exist
687 * before invocation of this function will be ignored.
688 */
689static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
690{
691 struct device_attribute **attr;
692
693 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
694 device_remove_file(&shost->shost_dev, *attr);
695}
696
ee12d6a8
BVA		 697static void srp_remove_target(struct srp_target_port *target)
698{
ef6c49d8
BVA		 699 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
700
ee12d6a8 701 srp_del_scsi_host_attr(target->scsi_host);
9dd69a60 702 srp_rport_get(target->rport);
ee12d6a8
BVA		 703 srp_remove_host(target->scsi_host);
704 scsi_remove_host(target->scsi_host);
93079162 705 srp_stop_rport_timers(target->rport);
ef6c49d8 706 srp_disconnect_target(target);
ee12d6a8
BVA		 707 ib_destroy_cm_id(target->cm_id);
708 srp_free_target_ib(target);
c1120f89 709 cancel_work_sync(&target->tl_err_work);
9dd69a60 710 srp_rport_put(target->rport);
ee12d6a8 711 srp_free_req_data(target);
65d7dd2f
VP		 712
713 spin_lock(&target->srp_host->target_lock);
714 list_del(&target->list);
715 spin_unlock(&target->srp_host->target_lock);
716
ee12d6a8
BVA		 717 scsi_host_put(target->scsi_host);
718}
719
c4028958 720static void srp_remove_work(struct work_struct *work)
aef9ec39 721{
c4028958 722 struct srp_target_port *target =
ef6c49d8 723 container_of(work, struct srp_target_port, remove_work);
aef9ec39 724
ef6c49d8 725 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 726
96fc248a 727 srp_remove_target(target);
aef9ec39
RD		 728}
729
dc1bdbd9
BVA		 730static void srp_rport_delete(struct srp_rport *rport)
731{
732 struct srp_target_port *target = rport->lld_data;
733
734 srp_queue_remove_work(target);
735}
736
aef9ec39
RD		 737static int srp_connect_target(struct srp_target_port *target)
738{
9fe4bcf4 739 int retries = 3;
aef9ec39
RD		 740 int ret;
741
294c875a
BVA		 742 WARN_ON_ONCE(target->connected);
743
948d1e88
BVA		 744 target->qp_in_error = false;
745
aef9ec39
RD		 746 ret = srp_lookup_path(target);
747 if (ret)
748 return ret;
749
750 while (1) {
751 init_completion(&target->done);
752 ret = srp_send_req(target);
753 if (ret)
754 return ret;
a702adce
BVA		 755 ret = wait_for_completion_interruptible(&target->done);
756 if (ret < 0)
757 return ret;
aef9ec39
RD		 758
759 /*
760 * The CM event handling code will set status to
761 * SRP_PORT_REDIRECT if we get a port redirect REJ
762 * back, or SRP_DLID_REDIRECT if we get a lid/qp
763 * redirect REJ back.
764 */
765 switch (target->status) {
766 case 0:
294c875a 767 srp_change_conn_state(target, true);
aef9ec39
RD		 768 return 0;
769
770 case SRP_PORT_REDIRECT:
771 ret = srp_lookup_path(target);
772 if (ret)
773 return ret;
774 break;
775
776 case SRP_DLID_REDIRECT:
777 break;
778
9fe4bcf4
DD		 779 case SRP_STALE_CONN:
780 /* Our current CM id was stale, and is now in timewait.
781 * Try to reconnect with a new one.
782 */
783 if (!retries-- || srp_new_cm_id(target)) {
784 shost_printk(KERN_ERR, target->scsi_host, PFX
785 "giving up on stale connection\n");
786 target->status = -ECONNRESET;
787 return target->status;
788 }
789
790 shost_printk(KERN_ERR, target->scsi_host, PFX
791 "retrying stale connection\n");
792 break;
793
aef9ec39
RD		 794 default:
795 return target->status;
796 }
797 }
798}
799
d945e1df
RD		 800static void srp_unmap_data(struct scsi_cmnd *scmnd,
801 struct srp_target_port *target,
802 struct srp_request *req)
803{
8f26c9ff
DD		 804 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
805 struct ib_pool_fmr **pfmr;
806
bb350d1d 807 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 808 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
809 scmnd->sc_data_direction != DMA_FROM_DEVICE))
810 return;
811
8f26c9ff 812 pfmr = req->fmr_list;
52ede08f 813 while (req->nmdesc--)
8f26c9ff 814 ib_fmr_pool_unmap(*pfmr++);
f5358a17 815
8f26c9ff
DD		 816 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
817 scmnd->sc_data_direction);
d945e1df
RD		 818}
819
22032991
BVA		 820/**
821 * srp_claim_req - Take ownership of the scmnd associated with a request.
822 * @target: SRP target port.
823 * @req: SRP request.
b3fe628d 824 * @sdev: If not NULL, only take ownership for this SCSI device.
22032991
BVA		 825 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
826 * ownership of @req->scmnd if it equals @scmnd.
827 *
828 * Return value:
829 * Either NULL or a pointer to the SCSI command the caller became owner of.
830 */
831static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
832 struct srp_request *req,
b3fe628d 833 struct scsi_device *sdev,
22032991
BVA		 834 struct scsi_cmnd *scmnd)
835{
836 unsigned long flags;
837
838 spin_lock_irqsave(&target->lock, flags);
b3fe628d
BVA		 839 if (req->scmnd &&
840 (!sdev || req->scmnd->device == sdev) &&
841 (!scmnd || req->scmnd == scmnd)) {
22032991
BVA		 842 scmnd = req->scmnd;
843 req->scmnd = NULL;
22032991
BVA		 844 } else {
845 scmnd = NULL;
846 }
847 spin_unlock_irqrestore(&target->lock, flags);
848
849 return scmnd;
850}
851
852/**
853 * srp_free_req() - Unmap data and add request to the free request list.
af24663b
BVA		 854 * @target: SRP target port.
855 * @req: Request to be freed.
856 * @scmnd: SCSI command associated with @req.
857 * @req_lim_delta: Amount to be added to @target->req_lim.
22032991
BVA		 858 */
859static void srp_free_req(struct srp_target_port *target,
860 struct srp_request *req, struct scsi_cmnd *scmnd,
861 s32 req_lim_delta)
526b4caa 862{
94a9174c
BVA		 863 unsigned long flags;
864
22032991
BVA		 865 srp_unmap_data(scmnd, target, req);
866
e9684678 867 spin_lock_irqsave(&target->lock, flags);
94a9174c 868 target->req_lim += req_lim_delta;
536ae14e 869 list_add_tail(&req->list, &target->free_reqs);
e9684678 870 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 871}
872
ed9b2264 873static void srp_finish_req(struct srp_target_port *target,
b3fe628d
BVA		 874 struct srp_request *req, struct scsi_device *sdev,
875 int result)
526b4caa 876{
b3fe628d 877 struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
22032991
BVA		 878
879 if (scmnd) {
9b796d06 880 srp_free_req(target, req, scmnd, 0);
ed9b2264 881 scmnd->result = result;
22032991 882 scmnd->scsi_done(scmnd);
22032991 883 }
526b4caa
IR		 884}
885
ed9b2264 886static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 887{
ed9b2264 888 struct srp_target_port *target = rport->lld_data;
b3fe628d
BVA		 889 struct Scsi_Host *shost = target->scsi_host;
890 struct scsi_device *sdev;
ed9b2264
BVA		 891 int i;
892
b3fe628d
BVA		 893 /*
894 * Invoking srp_terminate_io() while srp_queuecommand() is running
895 * is not safe. Hence the warning statement below.
896 */
897 shost_for_each_device(sdev, shost)
898 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
899
4d73f95f 900 for (i = 0; i < target->req_ring_size; ++i) {
ed9b2264 901 struct srp_request *req = &target->req_ring[i];
b3fe628d 902 srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
ed9b2264
BVA		 903 }
904}
aef9ec39 905
ed9b2264
BVA		 906/*
907 * It is up to the caller to ensure that srp_rport_reconnect() calls are
908 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
909 * srp_reset_device() or srp_reset_host() calls will occur while this function
910 * is in progress. One way to realize that is not to call this function
911 * directly but to call srp_reconnect_rport() instead since that last function
912 * serializes calls of this function via rport->mutex and also blocks
913 * srp_queuecommand() calls before invoking this function.
914 */
915static int srp_rport_reconnect(struct srp_rport *rport)
916{
917 struct srp_target_port *target = rport->lld_data;
918 int i, ret;
09be70a2 919
aef9ec39
RD		 920 srp_disconnect_target(target);
921 /*
c7c4e7ff
BVA		 922 * Now get a new local CM ID so that we avoid confusing the target in
923 * case things are really fouled up. Doing so also ensures that all CM
924 * callbacks will have finished before a new QP is allocated.
aef9ec39 925 */
9fe4bcf4 926 ret = srp_new_cm_id(target);
c7c4e7ff
BVA		 927 /*
928 * Whether or not creating a new CM ID succeeded, create a new
929 * QP. This guarantees that all completion callback function
930 * invocations have finished before request resetting starts.
931 */
932 if (ret == 0)
933 ret = srp_create_target_ib(target);
934 else
935 srp_create_target_ib(target);
aef9ec39 936
4d73f95f 937 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 938 struct srp_request *req = &target->req_ring[i];
b3fe628d 939 srp_finish_req(target, req, NULL, DID_RESET << 16);
536ae14e 940 }
aef9ec39 941
536ae14e 942 INIT_LIST_HEAD(&target->free_tx);
4d73f95f 943 for (i = 0; i < target->queue_size; ++i)
536ae14e 944 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 945
c7c4e7ff
BVA		 946 if (ret == 0)
947 ret = srp_connect_target(target);
09be70a2 948
ed9b2264
BVA		 949 if (ret == 0)
950 shost_printk(KERN_INFO, target->scsi_host,
951 PFX "reconnect succeeded\n");
aef9ec39
RD		 952
953 return ret;
954}
955
8f26c9ff
DD		 956static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
957 unsigned int dma_len, u32 rkey)
f5358a17 958{
8f26c9ff 959 struct srp_direct_buf *desc = state->desc;
f5358a17 960
8f26c9ff
DD		 961 desc->va = cpu_to_be64(dma_addr);
962 desc->key = cpu_to_be32(rkey);
963 desc->len = cpu_to_be32(dma_len);
f5358a17 964
8f26c9ff
DD		 965 state->total_len += dma_len;
966 state->desc++;
967 state->ndesc++;
968}
559ce8f1 969
8f26c9ff
DD		 970static int srp_map_finish_fmr(struct srp_map_state *state,
971 struct srp_target_port *target)
972{
8f26c9ff
DD		 973 struct ib_pool_fmr *fmr;
974 u64 io_addr = 0;
85507bcc 975
d1b4289e 976 fmr = ib_fmr_pool_map_phys(target->fmr_pool, state->pages,
8f26c9ff
DD		 977 state->npages, io_addr);
978 if (IS_ERR(fmr))
979 return PTR_ERR(fmr);
f5358a17 980
8f26c9ff 981 *state->next_fmr++ = fmr;
52ede08f 982 state->nmdesc++;
f5358a17 983
52ede08f 984 srp_map_desc(state, 0, state->dma_len, fmr->fmr->rkey);
539dde6f 985
8f26c9ff
DD		 986 return 0;
987}
988
539dde6f
BVA		 989static int srp_finish_mapping(struct srp_map_state *state,
990 struct srp_target_port *target)
991{
992 int ret = 0;
993
994 if (state->npages == 0)
995 return 0;
996
b1b8854d 997 if (state->npages == 1 && !register_always)
52ede08f 998 srp_map_desc(state, state->base_dma_addr, state->dma_len,
539dde6f
BVA		 999 target->rkey);
1000 else
1001 ret = srp_map_finish_fmr(state, target);
1002
1003 if (ret == 0) {
1004 state->npages = 0;
52ede08f 1005 state->dma_len = 0;
539dde6f
BVA		 1006 }
1007
1008 return ret;
1009}
1010
8f26c9ff
DD		 1011static void srp_map_update_start(struct srp_map_state *state,
1012 struct scatterlist *sg, int sg_index,
1013 dma_addr_t dma_addr)
1014{
1015 state->unmapped_sg = sg;
1016 state->unmapped_index = sg_index;
1017 state->unmapped_addr = dma_addr;
1018}
85507bcc 1019
8f26c9ff
DD		 1020static int srp_map_sg_entry(struct srp_map_state *state,
1021 struct srp_target_port *target,
1022 struct scatterlist *sg, int sg_index,
1023 int use_fmr)
1024{
1025 struct srp_device *dev = target->srp_host->srp_dev;
1026 struct ib_device *ibdev = dev->dev;
1027 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
1028 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
1029 unsigned int len;
1030 int ret;
1031
1032 if (!dma_len)
1033 return 0;
1034
1035 if (use_fmr == SRP_MAP_NO_FMR) {
1036 /* Once we're in direct map mode for a request, we don't
1037 * go back to FMR mode, so no need to update anything
1038 * other than the descriptor.
1039 */
1040 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1041 return 0;
85507bcc 1042 }
f5358a17 1043
8f26c9ff
DD		 1044 /* If we start at an offset into the FMR page, don't merge into
1045 * the current FMR. Finish it out, and use the kernel's MR for this
1046 * sg entry. This is to avoid potential bugs on some SRP targets
1047 * that were never quite defined, but went away when the initiator
1048 * avoided using FMR on such page fragments.
1049 */
52ede08f 1050 if (dma_addr & ~dev->mr_page_mask || dma_len > dev->mr_max_size) {
539dde6f 1051 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1052 if (ret)
1053 return ret;
1054
1055 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1056 srp_map_update_start(state, NULL, 0, 0);
1057 return 0;
f5358a17
RD		 1058 }
1059
8f26c9ff
DD		 1060 /* If this is the first sg to go into the FMR, save our position.
1061 * We need to know the first unmapped entry, its index, and the
1062 * first unmapped address within that entry to be able to restart
1063 * mapping after an error.
1064 */
1065 if (!state->unmapped_sg)
1066 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 1067
8f26c9ff 1068 while (dma_len) {
52ede08f 1069 if (state->npages == dev->max_pages_per_mr) {
539dde6f 1070 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1071 if (ret)
1072 return ret;
f5358a17 1073
8f26c9ff
DD		 1074 srp_map_update_start(state, sg, sg_index, dma_addr);
1075 }
1076
52ede08f 1077 len = min_t(unsigned int, dma_len, dev->mr_page_size);
f5358a17 1078
8f26c9ff
DD		 1079 if (!state->npages)
1080 state->base_dma_addr = dma_addr;
1081 state->pages[state->npages++] = dma_addr;
52ede08f 1082 state->dma_len += len;
8f26c9ff
DD		 1083 dma_addr += len;
1084 dma_len -= len;
1085 }
1086
1087 /* If the last entry of the FMR wasn't a full page, then we need to
1088 * close it out and start a new one -- we can only merge at page
1089 * boundries.
1090 */
1091 ret = 0;
52ede08f 1092 if (len != dev->mr_page_size) {
539dde6f 1093 ret = srp_finish_mapping(state, target);
8f26c9ff
DD		 1094 if (!ret)
1095 srp_map_update_start(state, NULL, 0, 0);
1096 }
f5358a17
RD		 1097 return ret;
1098}
1099
76bc1e1d
BVA		 1100static void srp_map_fmr(struct srp_map_state *state,
1101 struct srp_target_port *target, struct srp_request *req,
1102 struct scatterlist *scat, int count)
1103{
1104 struct srp_device *dev = target->srp_host->srp_dev;
1105 struct ib_device *ibdev = dev->dev;
1106 struct scatterlist *sg;
1107 int i, use_fmr;
1108
1109 state->desc = req->indirect_desc;
1110 state->pages = req->map_page;
1111 state->next_fmr = req->fmr_list;
1112
d1b4289e 1113 use_fmr = target->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
76bc1e1d
BVA		 1114
1115 for_each_sg(scat, sg, count, i) {
1116 if (srp_map_sg_entry(state, target, sg, i, use_fmr)) {
1117 /* FMR mapping failed, so backtrack to the first
1118 * unmapped entry and continue on without using FMR.
1119 */
1120 dma_addr_t dma_addr;
1121 unsigned int dma_len;
1122
1123backtrack:
1124 sg = state->unmapped_sg;
1125 i = state->unmapped_index;
1126
1127 dma_addr = ib_sg_dma_address(ibdev, sg);
1128 dma_len = ib_sg_dma_len(ibdev, sg);
1129 dma_len -= (state->unmapped_addr - dma_addr);
1130 dma_addr = state->unmapped_addr;
1131 use_fmr = SRP_MAP_NO_FMR;
1132 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1133 }
1134 }
1135
539dde6f 1136 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_finish_mapping(state, target))
76bc1e1d
BVA		 1137 goto backtrack;
1138
52ede08f 1139 req->nmdesc = state->nmdesc;
76bc1e1d
BVA		 1140}
1141
aef9ec39
RD		 1142static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1143 struct srp_request *req)
1144{
76bc1e1d 1145 struct scatterlist *scat;
aef9ec39 1146 struct srp_cmd *cmd = req->cmd->buf;
76bc1e1d 1147 int len, nents, count;
85507bcc
RC		 1148 struct srp_device *dev;
1149 struct ib_device *ibdev;
8f26c9ff
DD		 1150 struct srp_map_state state;
1151 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 1152 u32 table_len;
1153 u8 fmt;
aef9ec39 1154
bb350d1d 1155 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 1156 return sizeof (struct srp_cmd);
1157
1158 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1159 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 1160 shost_printk(KERN_WARNING, target->scsi_host,
1161 PFX "Unhandled data direction %d\n",
1162 scmnd->sc_data_direction);
aef9ec39
RD		 1163 return -EINVAL;
1164 }
1165
bb350d1d
FT		 1166 nents = scsi_sg_count(scmnd);
1167 scat = scsi_sglist(scmnd);
aef9ec39 1168
05321937 1169 dev = target->srp_host->srp_dev;
85507bcc
RC		 1170 ibdev = dev->dev;
1171
1172 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 1173 if (unlikely(count == 0))
1174 return -EIO;
f5358a17
RD		 1175
1176 fmt = SRP_DATA_DESC_DIRECT;
1177 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1178
b1b8854d 1179 if (count == 1 && !register_always) {
f5358a17
RD		 1180 /*
1181 * The midlayer only generated a single gather/scatter
1182 * entry, or DMA mapping coalesced everything to a
1183 * single entry. So a direct descriptor along with
1184 * the DMA MR suffices.
1185 */
cf368713 1186 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1187
85507bcc 1188 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1189 buf->key = cpu_to_be32(target->rkey);
85507bcc 1190 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff 1191
52ede08f 1192 req->nmdesc = 0;
8f26c9ff
DD		 1193 goto map_complete;
1194 }
1195
1196 /* We have more than one scatter/gather entry, so build our indirect
1197 * descriptor table, trying to merge as many entries with FMR as we
1198 * can.
1199 */
1200 indirect_hdr = (void *) cmd->add_data;
1201
c07d424d
DD		 1202 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1203 target->indirect_size, DMA_TO_DEVICE);
1204
8f26c9ff 1205 memset(&state, 0, sizeof(state));
76bc1e1d 1206 srp_map_fmr(&state, target, req, scat, count);
cf368713 1207
c07d424d
DD		 1208 /* We've mapped the request, now pull as much of the indirect
1209 * descriptor table as we can into the command buffer. If this
1210 * target is not using an external indirect table, we are
1211 * guaranteed to fit into the command, as the SCSI layer won't
1212 * give us more S/G entries than we allow.
8f26c9ff 1213 */
8f26c9ff
DD		 1214 if (state.ndesc == 1) {
1215 /* FMR mapping was able to collapse this to one entry,
1216 * so use a direct descriptor.
1217 */
1218 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1219
c07d424d 1220 *buf = req->indirect_desc[0];
8f26c9ff 1221 goto map_complete;
aef9ec39
RD		 1222 }
1223
c07d424d
DD		 1224 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1225 !target->allow_ext_sg)) {
1226 shost_printk(KERN_ERR, target->scsi_host,
1227 "Could not fit S/G list into SRP_CMD\n");
1228 return -EIO;
1229 }
1230
1231 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1232 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1233
1234 fmt = SRP_DATA_DESC_INDIRECT;
1235 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1236 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1237
c07d424d
DD		 1238 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1239 count * sizeof (struct srp_direct_buf));
8f26c9ff 1240
c07d424d 1241 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1242 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1243 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1244 indirect_hdr->len = cpu_to_be32(state.total_len);
1245
1246 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1247 cmd->data_out_desc_cnt = count;
8f26c9ff 1248 else
c07d424d
DD		 1249 cmd->data_in_desc_cnt = count;
1250
1251 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1252 DMA_TO_DEVICE);
8f26c9ff
DD		 1253
1254map_complete:
aef9ec39
RD		 1255 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1256 cmd->buf_fmt = fmt << 4;
1257 else
1258 cmd->buf_fmt = fmt;
1259
aef9ec39
RD		 1260 return len;
1261}
1262
76c75b25
BVA		 1263/*
1264 * Return an IU and possible credit to the free pool
1265 */
1266static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1267 enum srp_iu_type iu_type)
1268{
1269 unsigned long flags;
1270
e9684678 1271 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1272 list_add(&iu->list, &target->free_tx);
1273 if (iu_type != SRP_IU_RSP)
1274 ++target->req_lim;
e9684678 1275 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1276}
1277
05a1d750 1278/*
e9684678
BVA		 1279 * Must be called with target->lock held to protect req_lim and free_tx.
1280 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1281 *
1282 * Note:
1283 * An upper limit for the number of allocated information units for each
1284 * request type is:
1285 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1286 * more than Scsi_Host.can_queue requests.
1287 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1288 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1289 * one unanswered SRP request to an initiator.
1290 */
1291static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1292 enum srp_iu_type iu_type)
1293{
1294 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1295 struct srp_iu *iu;
1296
1297 srp_send_completion(target->send_cq, target);
1298
dcb4cb85 1299 if (list_empty(&target->free_tx))
05a1d750
DD		 1300 return NULL;
1301
1302 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1303 if (iu_type != SRP_IU_RSP) {
1304 if (target->req_lim <= rsv) {
1305 ++target->zero_req_lim;
1306 return NULL;
1307 }
1308
1309 --target->req_lim;
05a1d750
DD		 1310 }
1311
dcb4cb85 1312 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1313 list_del(&iu->list);
05a1d750
DD		 1314 return iu;
1315}
1316
76c75b25
BVA		 1317static int srp_post_send(struct srp_target_port *target,
1318 struct srp_iu *iu, int len)
05a1d750
DD		 1319{
1320 struct ib_sge list;
1321 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1322
1323 list.addr = iu->dma;
1324 list.length = len;
9af76271 1325 list.lkey = target->lkey;
05a1d750
DD		 1326
1327 wr.next = NULL;
dcb4cb85 1328 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1329 wr.sg_list = &list;
1330 wr.num_sge = 1;
1331 wr.opcode = IB_WR_SEND;
1332 wr.send_flags = IB_SEND_SIGNALED;
1333
76c75b25 1334 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1335}
1336
dcb4cb85 1337static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1338{
c996bb47 1339 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1340 struct ib_sge list;
c996bb47
BVA		 1341
1342 list.addr = iu->dma;
1343 list.length = iu->size;
9af76271 1344 list.lkey = target->lkey;
c996bb47
BVA		 1345
1346 wr.next = NULL;
dcb4cb85 1347 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1348 wr.sg_list = &list;
1349 wr.num_sge = 1;
1350
dcb4cb85 1351 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1352}
1353
aef9ec39
RD		 1354static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1355{
1356 struct srp_request *req;
1357 struct scsi_cmnd *scmnd;
1358 unsigned long flags;
aef9ec39 1359
aef9ec39 1360 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1361 spin_lock_irqsave(&target->lock, flags);
94a9174c 1362 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1363 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1364
f8b6e31e
DD		 1365 target->tsk_mgmt_status = -1;
1366 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1367 target->tsk_mgmt_status = rsp->data[3];
1368 complete(&target->tsk_mgmt_done);
aef9ec39 1369 } else {
f8b6e31e 1370 req = &target->req_ring[rsp->tag];
b3fe628d 1371 scmnd = srp_claim_req(target, req, NULL, NULL);
22032991 1372 if (!scmnd) {
7aa54bd7
DD		 1373 shost_printk(KERN_ERR, target->scsi_host,
1374 "Null scmnd for RSP w/tag %016llx\n",
1375 (unsigned long long) rsp->tag);
22032991
BVA		 1376
1377 spin_lock_irqsave(&target->lock, flags);
1378 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1379 spin_unlock_irqrestore(&target->lock, flags);
1380
1381 return;
1382 }
aef9ec39
RD		 1383 scmnd->result = rsp->status;
1384
1385 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1386 memcpy(scmnd->sense_buffer, rsp->data +
1387 be32_to_cpu(rsp->resp_data_len),
1388 min_t(int, be32_to_cpu(rsp->sense_data_len),
1389 SCSI_SENSE_BUFFERSIZE));
1390 }
1391
1392 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1393 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1394 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1395 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1396
22032991
BVA		 1397 srp_free_req(target, req, scmnd,
1398 be32_to_cpu(rsp->req_lim_delta));
1399
f8b6e31e
DD		 1400 scmnd->host_scribble = NULL;
1401 scmnd->scsi_done(scmnd);
aef9ec39 1402 }
aef9ec39
RD		 1403}
1404
bb12588a
DD		 1405static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1406 void *rsp, int len)
1407{
76c75b25 1408 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1409 unsigned long flags;
1410 struct srp_iu *iu;
76c75b25 1411 int err;
bb12588a 1412
e9684678 1413 spin_lock_irqsave(&target->lock, flags);
bb12588a 1414 target->req_lim += req_delta;
bb12588a 1415 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1416 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1417
bb12588a
DD		 1418 if (!iu) {
1419 shost_printk(KERN_ERR, target->scsi_host, PFX
1420 "no IU available to send response\n");
76c75b25 1421 return 1;
bb12588a
DD		 1422 }
1423
1424 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1425 memcpy(iu->buf, rsp, len);
1426 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1427
76c75b25
BVA		 1428 err = srp_post_send(target, iu, len);
1429 if (err) {
bb12588a
DD		 1430 shost_printk(KERN_ERR, target->scsi_host, PFX
1431 "unable to post response: %d\n", err);
76c75b25
BVA		 1432 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1433 }
bb12588a 1434
bb12588a
DD		 1435 return err;
1436}
1437
1438static void srp_process_cred_req(struct srp_target_port *target,
1439 struct srp_cred_req *req)
1440{
1441 struct srp_cred_rsp rsp = {
1442 .opcode = SRP_CRED_RSP,
1443 .tag = req->tag,
1444 };
1445 s32 delta = be32_to_cpu(req->req_lim_delta);
1446
1447 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1448 shost_printk(KERN_ERR, target->scsi_host, PFX
1449 "problems processing SRP_CRED_REQ\n");
1450}
1451
1452static void srp_process_aer_req(struct srp_target_port *target,
1453 struct srp_aer_req *req)
1454{
1455 struct srp_aer_rsp rsp = {
1456 .opcode = SRP_AER_RSP,
1457 .tag = req->tag,
1458 };
1459 s32 delta = be32_to_cpu(req->req_lim_delta);
1460
1461 shost_printk(KERN_ERR, target->scsi_host, PFX
1462 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1463
1464 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1465 shost_printk(KERN_ERR, target->scsi_host, PFX
1466 "problems processing SRP_AER_REQ\n");
1467}
1468
aef9ec39
RD		 1469static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1470{
dcb4cb85 1471 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1472 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1473 int res;
aef9ec39
RD		 1474 u8 opcode;
1475
85507bcc
RC		 1476 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1477 DMA_FROM_DEVICE);
aef9ec39
RD		 1478
1479 opcode = *(u8 *) iu->buf;
1480
1481 if (0) {
7aa54bd7
DD		 1482 shost_printk(KERN_ERR, target->scsi_host,
1483 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1484 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1485 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1486 }
1487
1488 switch (opcode) {
1489 case SRP_RSP:
1490 srp_process_rsp(target, iu->buf);
1491 break;
1492
bb12588a
DD		 1493 case SRP_CRED_REQ:
1494 srp_process_cred_req(target, iu->buf);
1495 break;
1496
1497 case SRP_AER_REQ:
1498 srp_process_aer_req(target, iu->buf);
1499 break;
1500
aef9ec39
RD		 1501 case SRP_T_LOGOUT:
1502 /* XXX Handle target logout */
7aa54bd7
DD		 1503 shost_printk(KERN_WARNING, target->scsi_host,
1504 PFX "Got target logout request\n");
aef9ec39
RD		 1505 break;
1506
1507 default:
7aa54bd7
DD		 1508 shost_printk(KERN_WARNING, target->scsi_host,
1509 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1510 break;
1511 }
1512
85507bcc
RC		 1513 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1514 DMA_FROM_DEVICE);
c996bb47 1515
dcb4cb85 1516 res = srp_post_recv(target, iu);
c996bb47
BVA		 1517 if (res != 0)
1518 shost_printk(KERN_ERR, target->scsi_host,
1519 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1520}
1521
c1120f89
BVA		 1522/**
1523 * srp_tl_err_work() - handle a transport layer error
af24663b 1524 * @work: Work structure embedded in an SRP target port.
c1120f89
BVA		 1525 *
1526 * Note: This function may get invoked before the rport has been created,
1527 * hence the target->rport test.
1528 */
1529static void srp_tl_err_work(struct work_struct *work)
1530{
1531 struct srp_target_port *target;
1532
1533 target = container_of(work, struct srp_target_port, tl_err_work);
1534 if (target->rport)
1535 srp_start_tl_fail_timers(target->rport);
1536}
1537
cd4e3854 1538static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
948d1e88
BVA		 1539 struct srp_target_port *target)
1540{
294c875a 1541 if (target->connected && !target->qp_in_error) {
4f0af697
BVA		 1542 shost_printk(KERN_ERR, target->scsi_host,
1543 PFX "failed %s status %d\n",
cd4e3854 1544 send_err ? "send" : "receive",
4f0af697 1545 wc_status);
c1120f89 1546 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1547 }
948d1e88
BVA		 1548 target->qp_in_error = true;
1549}
1550
9c03dc9f 1551static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1552{
1553 struct srp_target_port *target = target_ptr;
1554 struct ib_wc wc;
aef9ec39
RD		 1555
1556 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1557 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1558 if (likely(wc.status == IB_WC_SUCCESS)) {
1559 srp_handle_recv(target, &wc);
1560 } else {
cd4e3854 1561 srp_handle_qp_err(wc.status, false, target);
aef9ec39 1562 }
9c03dc9f
BVA		 1563 }
1564}
1565
1566static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1567{
1568 struct srp_target_port *target = target_ptr;
1569 struct ib_wc wc;
dcb4cb85 1570 struct srp_iu *iu;
9c03dc9f
BVA		 1571
1572 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1573 if (likely(wc.status == IB_WC_SUCCESS)) {
1574 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1575 list_add(&iu->list, &target->free_tx);
1576 } else {
cd4e3854 1577 srp_handle_qp_err(wc.status, true, target);
9c03dc9f 1578 }
aef9ec39
RD		 1579 }
1580}
1581
76c75b25 1582static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1583{
76c75b25 1584 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1585 struct srp_rport *rport = target->rport;
aef9ec39
RD		 1586 struct srp_request *req;
1587 struct srp_iu *iu;
1588 struct srp_cmd *cmd;
85507bcc 1589 struct ib_device *dev;
76c75b25 1590 unsigned long flags;
d1b4289e 1591 int len, ret;
a95cadb9
BVA		 1592 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1593
1594 /*
1595 * The SCSI EH thread is the only context from which srp_queuecommand()
1596 * can get invoked for blocked devices (SDEV_BLOCK /
1597 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1598 * locking the rport mutex if invoked from inside the SCSI EH.
1599 */
1600 if (in_scsi_eh)
1601 mutex_lock(&rport->mutex);
aef9ec39 1602
d1b4289e
BVA		 1603 scmnd->result = srp_chkready(target->rport);
1604 if (unlikely(scmnd->result))
1605 goto err;
2ce19e72 1606
e9684678 1607 spin_lock_irqsave(&target->lock, flags);
bb12588a 1608 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1609 if (!iu)
695b8349
BVA		 1610 goto err_unlock;
1611
1612 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1613 list_del(&req->list);
1614 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1615
05321937 1616 dev = target->srp_host->srp_dev->dev;
49248644 1617 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1618 DMA_TO_DEVICE);
aef9ec39 1619
f8b6e31e 1620 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1621
1622 cmd = iu->buf;
1623 memset(cmd, 0, sizeof *cmd);
1624
1625 cmd->opcode = SRP_CMD;
1626 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1627 cmd->tag = req->index;
aef9ec39
RD		 1628 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1629
aef9ec39
RD		 1630 req->scmnd = scmnd;
1631 req->cmd = iu;
aef9ec39
RD		 1632
1633 len = srp_map_data(scmnd, target, req);
1634 if (len < 0) {
7aa54bd7 1635 shost_printk(KERN_ERR, target->scsi_host,
d1b4289e
BVA		 1636 PFX "Failed to map data (%d)\n", len);
1637 /*
1638 * If we ran out of memory descriptors (-ENOMEM) because an
1639 * application is queuing many requests with more than
52ede08f 1640 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
d1b4289e
BVA		 1641 * to reduce queue depth temporarily.
1642 */
1643 scmnd->result = len == -ENOMEM ?
1644 DID_OK << 16 | QUEUE_FULL << 1 : DID_ERROR << 16;
76c75b25 1645 goto err_iu;
aef9ec39
RD		 1646 }
1647
49248644 1648 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1649 DMA_TO_DEVICE);
aef9ec39 1650
76c75b25 1651 if (srp_post_send(target, iu, len)) {
7aa54bd7 1652 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1653 goto err_unmap;
1654 }
1655
d1b4289e
BVA		 1656 ret = 0;
1657
a95cadb9
BVA		 1658unlock_rport:
1659 if (in_scsi_eh)
1660 mutex_unlock(&rport->mutex);
1661
d1b4289e 1662 return ret;
aef9ec39
RD		 1663
1664err_unmap:
1665 srp_unmap_data(scmnd, target, req);
1666
76c75b25
BVA		 1667err_iu:
1668 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1669
024ca901
BVA		 1670 /*
1671 * Avoid that the loops that iterate over the request ring can
1672 * encounter a dangling SCSI command pointer.
1673 */
1674 req->scmnd = NULL;
1675
e9684678 1676 spin_lock_irqsave(&target->lock, flags);
76c75b25 1677 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1678
1679err_unlock:
e9684678 1680 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1681
d1b4289e
BVA		 1682err:
1683 if (scmnd->result) {
1684 scmnd->scsi_done(scmnd);
1685 ret = 0;
1686 } else {
1687 ret = SCSI_MLQUEUE_HOST_BUSY;
1688 }
a95cadb9 1689
d1b4289e 1690 goto unlock_rport;
aef9ec39
RD		 1691}
1692
4d73f95f
BVA		 1693/*
1694 * Note: the resources allocated in this function are freed in
1695 * srp_free_target_ib().
1696 */
aef9ec39
RD		 1697static int srp_alloc_iu_bufs(struct srp_target_port *target)
1698{
1699 int i;
1700
4d73f95f
BVA		 1701 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1702 GFP_KERNEL);
1703 if (!target->rx_ring)
1704 goto err_no_ring;
1705 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1706 GFP_KERNEL);
1707 if (!target->tx_ring)
1708 goto err_no_ring;
1709
1710 for (i = 0; i < target->queue_size; ++i) {
aef9ec39
RD		 1711 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1712 target->max_ti_iu_len,
1713 GFP_KERNEL, DMA_FROM_DEVICE);
1714 if (!target->rx_ring[i])
1715 goto err;
1716 }
1717
4d73f95f 1718 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1719 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1720 target->max_iu_len,
aef9ec39
RD		 1721 GFP_KERNEL, DMA_TO_DEVICE);
1722 if (!target->tx_ring[i])
1723 goto err;
dcb4cb85
BVA		 1724
1725 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1726 }
1727
1728 return 0;
1729
1730err:
4d73f95f 1731 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1732 srp_free_iu(target->srp_host, target->rx_ring[i]);
aef9ec39 1733 srp_free_iu(target->srp_host, target->tx_ring[i]);
aef9ec39
RD		 1734 }
1735
4d73f95f
BVA		 1736
1737err_no_ring:
1738 kfree(target->tx_ring);
1739 target->tx_ring = NULL;
1740 kfree(target->rx_ring);
1741 target->rx_ring = NULL;
1742
aef9ec39
RD		 1743 return -ENOMEM;
1744}
1745
c9b03c1a
BVA		 1746static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1747{
1748 uint64_t T_tr_ns, max_compl_time_ms;
1749 uint32_t rq_tmo_jiffies;
1750
1751 /*
1752 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1753 * table 91), both the QP timeout and the retry count have to be set
1754 * for RC QP's during the RTR to RTS transition.
1755 */
1756 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1757 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1758
1759 /*
1760 * Set target->rq_tmo_jiffies to one second more than the largest time
1761 * it can take before an error completion is generated. See also
1762 * C9-140..142 in the IBTA spec for more information about how to
1763 * convert the QP Local ACK Timeout value to nanoseconds.
1764 */
1765 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1766 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1767 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1768 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1769
1770 return rq_tmo_jiffies;
1771}
1772
961e0be8
DD		 1773static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1774 struct srp_login_rsp *lrsp,
1775 struct srp_target_port *target)
1776{
1777 struct ib_qp_attr *qp_attr = NULL;
1778 int attr_mask = 0;
1779 int ret;
1780 int i;
1781
1782 if (lrsp->opcode == SRP_LOGIN_RSP) {
1783 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1784 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1785
1786 /*
1787 * Reserve credits for task management so we don't
1788 * bounce requests back to the SCSI mid-layer.
1789 */
1790 target->scsi_host->can_queue
1791 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1792 target->scsi_host->can_queue);
4d73f95f
BVA		 1793 target->scsi_host->cmd_per_lun
1794 = min_t(int, target->scsi_host->can_queue,
1795 target->scsi_host->cmd_per_lun);
961e0be8
DD		 1796 } else {
1797 shost_printk(KERN_WARNING, target->scsi_host,
1798 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1799 ret = -ECONNRESET;
1800 goto error;
1801 }
1802
4d73f95f 1803 if (!target->rx_ring) {
961e0be8
DD		 1804 ret = srp_alloc_iu_bufs(target);
1805 if (ret)
1806 goto error;
1807 }
1808
1809 ret = -ENOMEM;
1810 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1811 if (!qp_attr)
1812 goto error;
1813
1814 qp_attr->qp_state = IB_QPS_RTR;
1815 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1816 if (ret)
1817 goto error_free;
1818
1819 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1820 if (ret)
1821 goto error_free;
1822
4d73f95f 1823 for (i = 0; i < target->queue_size; i++) {
961e0be8
DD		 1824 struct srp_iu *iu = target->rx_ring[i];
1825 ret = srp_post_recv(target, iu);
1826 if (ret)
1827 goto error_free;
1828 }
1829
1830 qp_attr->qp_state = IB_QPS_RTS;
1831 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1832 if (ret)
1833 goto error_free;
1834
c9b03c1a
BVA		 1835 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1836
961e0be8
DD		 1837 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1838 if (ret)
1839 goto error_free;
1840
1841 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1842
1843error_free:
1844 kfree(qp_attr);
1845
1846error:
1847 target->status = ret;
1848}
1849
aef9ec39
RD		 1850static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1851 struct ib_cm_event *event,
1852 struct srp_target_port *target)
1853{
7aa54bd7 1854 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1855 struct ib_class_port_info *cpi;
1856 int opcode;
1857
1858 switch (event->param.rej_rcvd.reason) {
1859 case IB_CM_REJ_PORT_CM_REDIRECT:
1860 cpi = event->param.rej_rcvd.ari;
1861 target->path.dlid = cpi->redirect_lid;
1862 target->path.pkey = cpi->redirect_pkey;
1863 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1864 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1865
1866 target->status = target->path.dlid ?
1867 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1868 break;
1869
1870 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1871 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1872 /*
1873 * Topspin/Cisco SRP gateways incorrectly send
1874 * reject reason code 25 when they mean 24
1875 * (port redirect).
1876 */
1877 memcpy(target->path.dgid.raw,
1878 event->param.rej_rcvd.ari, 16);
1879
7aa54bd7
DD		 1880 shost_printk(KERN_DEBUG, shost,
1881 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1882 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1883 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1884
1885 target->status = SRP_PORT_REDIRECT;
1886 } else {
7aa54bd7
DD		 1887 shost_printk(KERN_WARNING, shost,
1888 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1889 target->status = -ECONNRESET;
1890 }
1891 break;
1892
1893 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1894 shost_printk(KERN_WARNING, shost,
1895 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1896 target->status = -ECONNRESET;
1897 break;
1898
1899 case IB_CM_REJ_CONSUMER_DEFINED:
1900 opcode = *(u8 *) event->private_data;
1901 if (opcode == SRP_LOGIN_REJ) {
1902 struct srp_login_rej *rej = event->private_data;
1903 u32 reason = be32_to_cpu(rej->reason);
1904
1905 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1906 shost_printk(KERN_WARNING, shost,
1907 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1908 else
e7ffde01
BVA		 1909 shost_printk(KERN_WARNING, shost, PFX
1910 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
1911 target->path.sgid.raw,
1912 target->orig_dgid, reason);
aef9ec39 1913 } else
7aa54bd7
DD		 1914 shost_printk(KERN_WARNING, shost,
1915 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1916 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1917 target->status = -ECONNRESET;
1918 break;
1919
9fe4bcf4
DD		 1920 case IB_CM_REJ_STALE_CONN:
1921 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1922 target->status = SRP_STALE_CONN;
1923 break;
1924
aef9ec39 1925 default:
7aa54bd7
DD		 1926 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1927 event->param.rej_rcvd.reason);
aef9ec39
RD		 1928 target->status = -ECONNRESET;
1929 }
1930}
1931
1932static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1933{
1934 struct srp_target_port *target = cm_id->context;
aef9ec39 1935 int comp = 0;
aef9ec39
RD		 1936
1937 switch (event->event) {
1938 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1939 shost_printk(KERN_DEBUG, target->scsi_host,
1940 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1941 comp = 1;
1942 target->status = -ECONNRESET;
1943 break;
1944
1945 case IB_CM_REP_RECEIVED:
1946 comp = 1;
961e0be8 1947 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 1948 break;
1949
1950 case IB_CM_REJ_RECEIVED:
7aa54bd7 1951 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1952 comp = 1;
1953
1954 srp_cm_rej_handler(cm_id, event, target);
1955 break;
1956
b7ac4ab4 1957 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1958 shost_printk(KERN_WARNING, target->scsi_host,
1959 PFX "DREQ received - connection closed\n");
294c875a 1960 srp_change_conn_state(target, false);
b7ac4ab4 1961 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1962 shost_printk(KERN_ERR, target->scsi_host,
1963 PFX "Sending CM DREP failed\n");
c1120f89 1964 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 1965 break;
1966
1967 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1968 shost_printk(KERN_ERR, target->scsi_host,
1969 PFX "connection closed\n");
ac72d766 1970 comp = 1;
aef9ec39 1971
aef9ec39
RD		 1972 target->status = 0;
1973 break;
1974
b7ac4ab4
IR		 1975 case IB_CM_MRA_RECEIVED:
1976 case IB_CM_DREQ_ERROR:
1977 case IB_CM_DREP_RECEIVED:
1978 break;
1979
aef9ec39 1980 default:
7aa54bd7
DD		 1981 shost_printk(KERN_WARNING, target->scsi_host,
1982 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1983 break;
1984 }
1985
1986 if (comp)
1987 complete(&target->done);
1988
aef9ec39
RD		 1989 return 0;
1990}
1991
71444b97
JW		 1992/**
1993 * srp_change_queue_type - changing device queue tag type
1994 * @sdev: scsi device struct
1995 * @tag_type: requested tag type
1996 *
1997 * Returns queue tag type.
1998 */
1999static int
2000srp_change_queue_type(struct scsi_device *sdev, int tag_type)
2001{
2002 if (sdev->tagged_supported) {
2003 scsi_set_tag_type(sdev, tag_type);
2004 if (tag_type)
2005 scsi_activate_tcq(sdev, sdev->queue_depth);
2006 else
2007 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2008 } else
2009 tag_type = 0;
2010
2011 return tag_type;
2012}
2013
2014/**
2015 * srp_change_queue_depth - setting device queue depth
2016 * @sdev: scsi device struct
2017 * @qdepth: requested queue depth
2018 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
2019 * (see include/scsi/scsi_host.h for definition)
2020 *
2021 * Returns queue depth.
2022 */
2023static int
2024srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2025{
2026 struct Scsi_Host *shost = sdev->host;
2027 int max_depth;
2028 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
2029 max_depth = shost->can_queue;
2030 if (!sdev->tagged_supported)
2031 max_depth = 1;
2032 if (qdepth > max_depth)
2033 qdepth = max_depth;
2034 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2035 } else if (reason == SCSI_QDEPTH_QFULL)
2036 scsi_track_queue_full(sdev, qdepth);
2037 else
2038 return -EOPNOTSUPP;
2039
2040 return sdev->queue_depth;
2041}
2042
d945e1df 2043static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 2044 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 2045{
a95cadb9 2046 struct srp_rport *rport = target->rport;
19081f31 2047 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 2048 struct srp_iu *iu;
2049 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 2050
3780d1f0
BVA		 2051 if (!target->connected || target->qp_in_error)
2052 return -1;
2053
f8b6e31e 2054 init_completion(&target->tsk_mgmt_done);
aef9ec39 2055
a95cadb9
BVA		 2056 /*
2057 * Lock the rport mutex to avoid that srp_create_target_ib() is
2058 * invoked while a task management function is being sent.
2059 */
2060 mutex_lock(&rport->mutex);
e9684678 2061 spin_lock_irq(&target->lock);
bb12588a 2062 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 2063 spin_unlock_irq(&target->lock);
76c75b25 2064
a95cadb9
BVA		 2065 if (!iu) {
2066 mutex_unlock(&rport->mutex);
2067
76c75b25 2068 return -1;
a95cadb9 2069 }
aef9ec39 2070
19081f31
DD		 2071 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
2072 DMA_TO_DEVICE);
aef9ec39
RD		 2073 tsk_mgmt = iu->buf;
2074 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2075
2076 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 2077 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
2078 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 2079 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 2080 tsk_mgmt->task_tag = req_tag;
aef9ec39 2081
19081f31
DD		 2082 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2083 DMA_TO_DEVICE);
76c75b25
BVA		 2084 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
2085 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 2086 mutex_unlock(&rport->mutex);
2087
76c75b25
BVA		 2088 return -1;
2089 }
a95cadb9 2090 mutex_unlock(&rport->mutex);
d945e1df 2091
f8b6e31e 2092 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 2093 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 2094 return -1;
aef9ec39 2095
d945e1df 2096 return 0;
d945e1df
RD		 2097}
2098
aef9ec39
RD		 2099static int srp_abort(struct scsi_cmnd *scmnd)
2100{
d945e1df 2101 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 2102 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
086f44f5 2103 int ret;
d945e1df 2104
7aa54bd7 2105 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 2106
b3fe628d 2107 if (!req || !srp_claim_req(target, req, NULL, scmnd))
99b6697a 2108 return SUCCESS;
086f44f5 2109 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
80d5e8a2 2110 SRP_TSK_ABORT_TASK) == 0)
086f44f5 2111 ret = SUCCESS;
ed9b2264 2112 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 2113 ret = FAST_IO_FAIL;
086f44f5
BVA		 2114 else
2115 ret = FAILED;
22032991
BVA		 2116 srp_free_req(target, req, scmnd, 0);
2117 scmnd->result = DID_ABORT << 16;
d8536670 2118 scmnd->scsi_done(scmnd);
d945e1df 2119
086f44f5 2120 return ret;
aef9ec39
RD		 2121}
2122
2123static int srp_reset_device(struct scsi_cmnd *scmnd)
2124{
d945e1df 2125 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 2126 int i;
d945e1df 2127
7aa54bd7 2128 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 2129
f8b6e31e
DD		 2130 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2131 SRP_TSK_LUN_RESET))
d945e1df 2132 return FAILED;
f8b6e31e 2133 if (target->tsk_mgmt_status)
d945e1df
RD		 2134 return FAILED;
2135
4d73f95f 2136 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 2137 struct srp_request *req = &target->req_ring[i];
b3fe628d 2138 srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
536ae14e 2139 }
d945e1df 2140
d945e1df 2141 return SUCCESS;
aef9ec39
RD		 2142}
2143
2144static int srp_reset_host(struct scsi_cmnd *scmnd)
2145{
2146 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 2147
7aa54bd7 2148 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 2149
ed9b2264 2150 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 2151}
2152
c9b03c1a
BVA		 2153static int srp_slave_configure(struct scsi_device *sdev)
2154{
2155 struct Scsi_Host *shost = sdev->host;
2156 struct srp_target_port *target = host_to_target(shost);
2157 struct request_queue *q = sdev->request_queue;
2158 unsigned long timeout;
2159
2160 if (sdev->type == TYPE_DISK) {
2161 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2162 blk_queue_rq_timeout(q, timeout);
2163 }
2164
2165 return 0;
2166}
2167
ee959b00
TJ		 2168static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2169 char *buf)
6ecb0c84 2170{
ee959b00 2171 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2172
6ecb0c84
RD		 2173 return sprintf(buf, "0x%016llx\n",
2174 (unsigned long long) be64_to_cpu(target->id_ext));
2175}
2176
ee959b00
TJ		 2177static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2178 char *buf)
6ecb0c84 2179{
ee959b00 2180 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2181
6ecb0c84
RD		 2182 return sprintf(buf, "0x%016llx\n",
2183 (unsigned long long) be64_to_cpu(target->ioc_guid));
2184}
2185
ee959b00
TJ		 2186static ssize_t show_service_id(struct device *dev,
2187 struct device_attribute *attr, char *buf)
6ecb0c84 2188{
ee959b00 2189 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2190
6ecb0c84
RD		 2191 return sprintf(buf, "0x%016llx\n",
2192 (unsigned long long) be64_to_cpu(target->service_id));
2193}
2194
ee959b00
TJ		 2195static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2196 char *buf)
6ecb0c84 2197{
ee959b00 2198 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2199
6ecb0c84
RD		 2200 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2201}
2202
848b3082
BVA		 2203static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2204 char *buf)
2205{
2206 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2207
2208 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2209}
2210
ee959b00
TJ		 2211static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2212 char *buf)
6ecb0c84 2213{
ee959b00 2214 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2215
5b095d98 2216 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 2217}
2218
ee959b00
TJ		 2219static ssize_t show_orig_dgid(struct device *dev,
2220 struct device_attribute *attr, char *buf)
3633b3d0 2221{
ee959b00 2222 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 2223
5b095d98 2224 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 2225}
2226
89de7486
BVA		 2227static ssize_t show_req_lim(struct device *dev,
2228 struct device_attribute *attr, char *buf)
2229{
2230 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2231
89de7486
BVA		 2232 return sprintf(buf, "%d\n", target->req_lim);
2233}
2234
ee959b00
TJ		 2235static ssize_t show_zero_req_lim(struct device *dev,
2236 struct device_attribute *attr, char *buf)
6bfa24fa 2237{
ee959b00 2238 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 2239
6bfa24fa
RD		 2240 return sprintf(buf, "%d\n", target->zero_req_lim);
2241}
2242
ee959b00
TJ		 2243static ssize_t show_local_ib_port(struct device *dev,
2244 struct device_attribute *attr, char *buf)
ded7f1a1 2245{
ee959b00 2246 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2247
2248 return sprintf(buf, "%d\n", target->srp_host->port);
2249}
2250
ee959b00
TJ		 2251static ssize_t show_local_ib_device(struct device *dev,
2252 struct device_attribute *attr, char *buf)
ded7f1a1 2253{
ee959b00 2254 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2255
05321937 2256 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2257}
2258
4b5e5f41
BVA		 2259static ssize_t show_comp_vector(struct device *dev,
2260 struct device_attribute *attr, char *buf)
2261{
2262 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2263
2264 return sprintf(buf, "%d\n", target->comp_vector);
2265}
2266
7bb312e4
VP		 2267static ssize_t show_tl_retry_count(struct device *dev,
2268 struct device_attribute *attr, char *buf)
2269{
2270 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2271
2272 return sprintf(buf, "%d\n", target->tl_retry_count);
2273}
2274
49248644
DD		 2275static ssize_t show_cmd_sg_entries(struct device *dev,
2276 struct device_attribute *attr, char *buf)
2277{
2278 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2279
2280 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2281}
2282
c07d424d
DD		 2283static ssize_t show_allow_ext_sg(struct device *dev,
2284 struct device_attribute *attr, char *buf)
2285{
2286 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2287
2288 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2289}
2290
ee959b00
TJ		 2291static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2292static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2293static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2294static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
848b3082 2295static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
ee959b00
TJ		 2296static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2297static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2298static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2299static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2300static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2301static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2302static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2303static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2304static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2305static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2306
2307static struct device_attribute *srp_host_attrs[] = {
2308 &dev_attr_id_ext,
2309 &dev_attr_ioc_guid,
2310 &dev_attr_service_id,
2311 &dev_attr_pkey,
848b3082 2312 &dev_attr_sgid,
ee959b00
TJ		 2313 &dev_attr_dgid,
2314 &dev_attr_orig_dgid,
89de7486 2315 &dev_attr_req_lim,
ee959b00
TJ		 2316 &dev_attr_zero_req_lim,
2317 &dev_attr_local_ib_port,
2318 &dev_attr_local_ib_device,
4b5e5f41 2319 &dev_attr_comp_vector,
7bb312e4 2320 &dev_attr_tl_retry_count,
49248644 2321 &dev_attr_cmd_sg_entries,
c07d424d 2322 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2323 NULL
2324};
2325
aef9ec39
RD		 2326static struct scsi_host_template srp_template = {
2327 .module = THIS_MODULE,
b7f008fd
RD		 2328 .name = "InfiniBand SRP initiator",
2329 .proc_name = DRV_NAME,
c9b03c1a 2330 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2331 .info = srp_target_info,
2332 .queuecommand = srp_queuecommand,
71444b97
JW		 2333 .change_queue_depth = srp_change_queue_depth,
2334 .change_queue_type = srp_change_queue_type,
aef9ec39
RD		 2335 .eh_abort_handler = srp_abort,
2336 .eh_device_reset_handler = srp_reset_device,
2337 .eh_host_reset_handler = srp_reset_host,
2742c1da 2338 .skip_settle_delay = true,
49248644 2339 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
4d73f95f 2340 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
aef9ec39 2341 .this_id = -1,
4d73f95f 2342 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
6ecb0c84
RD		 2343 .use_clustering = ENABLE_CLUSTERING,
2344 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2345};
2346
2347static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2348{
3236822b
FT		 2349 struct srp_rport_identifiers ids;
2350 struct srp_rport *rport;
2351
aef9ec39
RD		 2352 sprintf(target->target_name, "SRP.T10:%016llX",
2353 (unsigned long long) be64_to_cpu(target->id_ext));
2354
05321937 2355 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2356 return -ENODEV;
2357
3236822b
FT		 2358 memcpy(ids.port_id, &target->id_ext, 8);
2359 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2360 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2361 rport = srp_rport_add(target->scsi_host, &ids);
2362 if (IS_ERR(rport)) {
2363 scsi_remove_host(target->scsi_host);
2364 return PTR_ERR(rport);
2365 }
2366
dc1bdbd9 2367 rport->lld_data = target;
9dd69a60 2368 target->rport = rport;
dc1bdbd9 2369
b3589fd4 2370 spin_lock(&host->target_lock);
aef9ec39 2371 list_add_tail(&target->list, &host->target_list);
b3589fd4 2372 spin_unlock(&host->target_lock);
aef9ec39
RD		 2373
2374 target->state = SRP_TARGET_LIVE;
2375
aef9ec39 2376 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2377 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 2378
2379 return 0;
2380}
2381
ee959b00 2382static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2383{
2384 struct srp_host *host =
ee959b00 2385 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2386
2387 complete(&host->released);
2388}
2389
2390static struct class srp_class = {
2391 .name = "infiniband_srp",
ee959b00 2392 .dev_release = srp_release_dev
aef9ec39
RD		 2393};
2394
96fc248a
BVA		 2395/**
2396 * srp_conn_unique() - check whether the connection to a target is unique
af24663b
BVA		 2397 * @host: SRP host.
2398 * @target: SRP target port.
96fc248a
BVA		 2399 */
2400static bool srp_conn_unique(struct srp_host *host,
2401 struct srp_target_port *target)
2402{
2403 struct srp_target_port *t;
2404 bool ret = false;
2405
2406 if (target->state == SRP_TARGET_REMOVED)
2407 goto out;
2408
2409 ret = true;
2410
2411 spin_lock(&host->target_lock);
2412 list_for_each_entry(t, &host->target_list, list) {
2413 if (t != target &&
2414 target->id_ext == t->id_ext &&
2415 target->ioc_guid == t->ioc_guid &&
2416 target->initiator_ext == t->initiator_ext) {
2417 ret = false;
2418 break;
2419 }
2420 }
2421 spin_unlock(&host->target_lock);
2422
2423out:
2424 return ret;
2425}
2426
aef9ec39
RD		 2427/*
2428 * Target ports are added by writing
2429 *
2430 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2431 * pkey=<P_Key>,service_id=<service ID>
2432 *
2433 * to the add_target sysfs attribute.
2434 */
2435enum {
2436 SRP_OPT_ERR = 0,
2437 SRP_OPT_ID_EXT = 1 << 0,
2438 SRP_OPT_IOC_GUID = 1 << 1,
2439 SRP_OPT_DGID = 1 << 2,
2440 SRP_OPT_PKEY = 1 << 3,
2441 SRP_OPT_SERVICE_ID = 1 << 4,
2442 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2443 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2444 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2445 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2446 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2447 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2448 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2449 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2450 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
4d73f95f 2451 SRP_OPT_QUEUE_SIZE = 1 << 14,
aef9ec39
RD		 2452 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2453 SRP_OPT_IOC_GUID |
2454 SRP_OPT_DGID |
2455 SRP_OPT_PKEY |
2456 SRP_OPT_SERVICE_ID),
2457};
2458
a447c093 2459static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2460 { SRP_OPT_ID_EXT, "id_ext=%s" },
2461 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2462 { SRP_OPT_DGID, "dgid=%s" },
2463 { SRP_OPT_PKEY, "pkey=%x" },
2464 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2465 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2466 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2467 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2468 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2469 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2470 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2471 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2472 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2473 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
4d73f95f 2474 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
52fb2b50 2475 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2476};
2477
2478static int srp_parse_options(const char *buf, struct srp_target_port *target)
2479{
2480 char *options, *sep_opt;
2481 char *p;
2482 char dgid[3];
2483 substring_t args[MAX_OPT_ARGS];
2484 int opt_mask = 0;
2485 int token;
2486 int ret = -EINVAL;
2487 int i;
2488
2489 options = kstrdup(buf, GFP_KERNEL);
2490 if (!options)
2491 return -ENOMEM;
2492
2493 sep_opt = options;
2494 while ((p = strsep(&sep_opt, ",")) != NULL) {
2495 if (!*p)
2496 continue;
2497
2498 token = match_token(p, srp_opt_tokens, args);
2499 opt_mask |= token;
2500
2501 switch (token) {
2502 case SRP_OPT_ID_EXT:
2503 p = match_strdup(args);
a20f3a6d
IR		 2504 if (!p) {
2505 ret = -ENOMEM;
2506 goto out;
2507 }
aef9ec39
RD		 2508 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2509 kfree(p);
2510 break;
2511
2512 case SRP_OPT_IOC_GUID:
2513 p = match_strdup(args);
a20f3a6d
IR		 2514 if (!p) {
2515 ret = -ENOMEM;
2516 goto out;
2517 }
aef9ec39
RD		 2518 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2519 kfree(p);
2520 break;
2521
2522 case SRP_OPT_DGID:
2523 p = match_strdup(args);
a20f3a6d
IR		 2524 if (!p) {
2525 ret = -ENOMEM;
2526 goto out;
2527 }
aef9ec39 2528 if (strlen(p) != 32) {
e0bda7d8 2529 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2530 kfree(p);
aef9ec39
RD		 2531 goto out;
2532 }
2533
2534 for (i = 0; i < 16; ++i) {
2535 strlcpy(dgid, p + i * 2, 3);
2536 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2537 }
bf17c1c7 2538 kfree(p);
3633b3d0 2539 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2540 break;
2541
2542 case SRP_OPT_PKEY:
2543 if (match_hex(args, &token)) {
e0bda7d8 2544 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2545 goto out;
2546 }
2547 target->path.pkey = cpu_to_be16(token);
2548 break;
2549
2550 case SRP_OPT_SERVICE_ID:
2551 p = match_strdup(args);
a20f3a6d
IR		 2552 if (!p) {
2553 ret = -ENOMEM;
2554 goto out;
2555 }
aef9ec39 2556 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2557 target->path.service_id = target->service_id;
aef9ec39
RD		 2558 kfree(p);
2559 break;
2560
2561 case SRP_OPT_MAX_SECT:
2562 if (match_int(args, &token)) {
e0bda7d8 2563 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2564 goto out;
2565 }
2566 target->scsi_host->max_sectors = token;
2567 break;
2568
4d73f95f
BVA		 2569 case SRP_OPT_QUEUE_SIZE:
2570 if (match_int(args, &token) || token < 1) {
2571 pr_warn("bad queue_size parameter '%s'\n", p);
2572 goto out;
2573 }
2574 target->scsi_host->can_queue = token;
2575 target->queue_size = token + SRP_RSP_SQ_SIZE +
2576 SRP_TSK_MGMT_SQ_SIZE;
2577 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2578 target->scsi_host->cmd_per_lun = token;
2579 break;
2580
52fb2b50 2581 case SRP_OPT_MAX_CMD_PER_LUN:
4d73f95f 2582 if (match_int(args, &token) || token < 1) {
e0bda7d8
BVA		 2583 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2584 p);
52fb2b50
VP		 2585 goto out;
2586 }
4d73f95f 2587 target->scsi_host->cmd_per_lun = token;
52fb2b50
VP		 2588 break;
2589
0c0450db
R		 2590 case SRP_OPT_IO_CLASS:
2591 if (match_hex(args, &token)) {
e0bda7d8 2592 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2593 goto out;
2594 }
2595 if (token != SRP_REV10_IB_IO_CLASS &&
2596 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2597 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2598 token, SRP_REV10_IB_IO_CLASS,
2599 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2600 goto out;
2601 }
2602 target->io_class = token;
2603 break;
2604
01cb9bcb
IR		 2605 case SRP_OPT_INITIATOR_EXT:
2606 p = match_strdup(args);
a20f3a6d
IR		 2607 if (!p) {
2608 ret = -ENOMEM;
2609 goto out;
2610 }
01cb9bcb
IR		 2611 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2612 kfree(p);
2613 break;
2614
49248644
DD		 2615 case SRP_OPT_CMD_SG_ENTRIES:
2616 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2617 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2618 p);
49248644
DD		 2619 goto out;
2620 }
2621 target->cmd_sg_cnt = token;
2622 break;
2623
c07d424d
DD		 2624 case SRP_OPT_ALLOW_EXT_SG:
2625 if (match_int(args, &token)) {
e0bda7d8 2626 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2627 goto out;
2628 }
2629 target->allow_ext_sg = !!token;
2630 break;
2631
2632 case SRP_OPT_SG_TABLESIZE:
2633 if (match_int(args, &token) || token < 1 ||
2634 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2635 pr_warn("bad max sg_tablesize parameter '%s'\n",
2636 p);
c07d424d
DD		 2637 goto out;
2638 }
2639 target->sg_tablesize = token;
2640 break;
2641
4b5e5f41
BVA		 2642 case SRP_OPT_COMP_VECTOR:
2643 if (match_int(args, &token) || token < 0) {
2644 pr_warn("bad comp_vector parameter '%s'\n", p);
2645 goto out;
2646 }
2647 target->comp_vector = token;
2648 break;
2649
7bb312e4
VP		 2650 case SRP_OPT_TL_RETRY_COUNT:
2651 if (match_int(args, &token) || token < 2 || token > 7) {
2652 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2653 p);
2654 goto out;
2655 }
2656 target->tl_retry_count = token;
2657 break;
2658
aef9ec39 2659 default:
e0bda7d8
BVA		 2660 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2661 p);
aef9ec39
RD		 2662 goto out;
2663 }
2664 }
2665
2666 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2667 ret = 0;
2668 else
2669 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2670 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2671 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2672 pr_warn("target creation request is missing parameter '%s'\n",
2673 srp_opt_tokens[i].pattern);
aef9ec39 2674
4d73f95f
BVA		 2675 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2676 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2677 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2678 target->scsi_host->cmd_per_lun,
2679 target->scsi_host->can_queue);
2680
aef9ec39
RD		 2681out:
2682 kfree(options);
2683 return ret;
2684}
2685
ee959b00
TJ		 2686static ssize_t srp_create_target(struct device *dev,
2687 struct device_attribute *attr,
aef9ec39
RD		 2688 const char *buf, size_t count)
2689{
2690 struct srp_host *host =
ee959b00 2691 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2692 struct Scsi_Host *target_host;
2693 struct srp_target_port *target;
d1b4289e
BVA		 2694 struct srp_device *srp_dev = host->srp_dev;
2695 struct ib_device *ibdev = srp_dev->dev;
b81d00bd 2696 int ret;
aef9ec39
RD		 2697
2698 target_host = scsi_host_alloc(&srp_template,
2699 sizeof (struct srp_target_port));
2700 if (!target_host)
2701 return -ENOMEM;
2702
49248644 2703 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2704 target_host->max_channel = 0;
2705 target_host->max_id = 1;
3c8edf0e
AR		 2706 target_host->max_lun = SRP_MAX_LUN;
2707 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2708
aef9ec39 2709 target = host_to_target(target_host);
aef9ec39 2710
49248644
DD		 2711 target->io_class = SRP_REV16A_IB_IO_CLASS;
2712 target->scsi_host = target_host;
2713 target->srp_host = host;
2714 target->lkey = host->srp_dev->mr->lkey;
2715 target->rkey = host->srp_dev->mr->rkey;
2716 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2717 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2718 target->allow_ext_sg = allow_ext_sg;
7bb312e4 2719 target->tl_retry_count = 7;
4d73f95f 2720 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
aef9ec39 2721
2d7091bc
BVA		 2722 mutex_lock(&host->add_target_mutex);
2723
aef9ec39
RD		 2724 ret = srp_parse_options(buf, target);
2725 if (ret)
2726 goto err;
2727
4d73f95f
BVA		 2728 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2729
96fc248a
BVA		 2730 if (!srp_conn_unique(target->srp_host, target)) {
2731 shost_printk(KERN_INFO, target->scsi_host,
2732 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2733 be64_to_cpu(target->id_ext),
2734 be64_to_cpu(target->ioc_guid),
2735 be64_to_cpu(target->initiator_ext));
2736 ret = -EEXIST;
2737 goto err;
2738 }
2739
d1b4289e
BVA		 2740 if (!srp_dev->has_fmr && !target->allow_ext_sg &&
2741 target->cmd_sg_cnt < target->sg_tablesize) {
e0bda7d8 2742 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 2743 target->sg_tablesize = target->cmd_sg_cnt;
2744 }
2745
2746 target_host->sg_tablesize = target->sg_tablesize;
2747 target->indirect_size = target->sg_tablesize *
2748 sizeof (struct srp_direct_buf);
49248644
DD		 2749 target->max_iu_len = sizeof (struct srp_cmd) +
2750 sizeof (struct srp_indirect_buf) +
2751 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2752
c1120f89 2753 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 2754 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 2755 spin_lock_init(&target->lock);
2756 INIT_LIST_HEAD(&target->free_tx);
b81d00bd
BVA		 2757 ret = srp_alloc_req_data(target);
2758 if (ret)
2759 goto err_free_mem;
8f26c9ff 2760
2088ca66
SG		 2761 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2762 if (ret)
2763 goto err_free_mem;
aef9ec39 2764
aef9ec39
RD		 2765 ret = srp_create_target_ib(target);
2766 if (ret)
8f26c9ff 2767 goto err_free_mem;
aef9ec39 2768
9fe4bcf4
DD		 2769 ret = srp_new_cm_id(target);
2770 if (ret)
8f26c9ff 2771 goto err_free_ib;
aef9ec39
RD		 2772
2773 ret = srp_connect_target(target);
2774 if (ret) {
7aa54bd7
DD		 2775 shost_printk(KERN_ERR, target->scsi_host,
2776 PFX "Connection failed\n");
aef9ec39
RD		 2777 goto err_cm_id;
2778 }
2779
2780 ret = srp_add_target(host, target);
2781 if (ret)
2782 goto err_disconnect;
2783
e7ffde01
BVA		 2784 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2785 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
2786 be64_to_cpu(target->id_ext),
2787 be64_to_cpu(target->ioc_guid),
2788 be16_to_cpu(target->path.pkey),
2789 be64_to_cpu(target->service_id),
2790 target->path.sgid.raw, target->path.dgid.raw);
2791
2d7091bc
BVA		 2792 ret = count;
2793
2794out:
2795 mutex_unlock(&host->add_target_mutex);
2796 return ret;
aef9ec39
RD		 2797
2798err_disconnect:
2799 srp_disconnect_target(target);
2800
2801err_cm_id:
2802 ib_destroy_cm_id(target->cm_id);
2803
8f26c9ff 2804err_free_ib:
aef9ec39
RD		 2805 srp_free_target_ib(target);
2806
8f26c9ff
DD		 2807err_free_mem:
2808 srp_free_req_data(target);
2809
aef9ec39
RD		 2810err:
2811 scsi_host_put(target_host);
2d7091bc 2812 goto out;
aef9ec39
RD		 2813}
2814
ee959b00 2815static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2816
ee959b00
TJ		 2817static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2818 char *buf)
aef9ec39 2819{
ee959b00 2820 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2821
05321937 2822 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2823}
2824
ee959b00 2825static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2826
ee959b00
TJ		 2827static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2828 char *buf)
aef9ec39 2829{
ee959b00 2830 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2831
2832 return sprintf(buf, "%d\n", host->port);
2833}
2834
ee959b00 2835static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2836
f5358a17 2837static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2838{
2839 struct srp_host *host;
2840
2841 host = kzalloc(sizeof *host, GFP_KERNEL);
2842 if (!host)
2843 return NULL;
2844
2845 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2846 spin_lock_init(&host->target_lock);
aef9ec39 2847 init_completion(&host->released);
2d7091bc 2848 mutex_init(&host->add_target_mutex);
05321937 2849 host->srp_dev = device;
aef9ec39
RD		 2850 host->port = port;
2851
ee959b00
TJ		 2852 host->dev.class = &srp_class;
2853 host->dev.parent = device->dev->dma_device;
d927e38c 2854 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2855
ee959b00 2856 if (device_register(&host->dev))
f5358a17 2857 goto free_host;
ee959b00 2858 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2859 goto err_class;
ee959b00 2860 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2861 goto err_class;
ee959b00 2862 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2863 goto err_class;
2864
2865 return host;
2866
2867err_class:
ee959b00 2868 device_unregister(&host->dev);
aef9ec39 2869
f5358a17 2870free_host:
aef9ec39
RD		 2871 kfree(host);
2872
2873 return NULL;
2874}
2875
2876static void srp_add_one(struct ib_device *device)
2877{
f5358a17
RD		 2878 struct srp_device *srp_dev;
2879 struct ib_device_attr *dev_attr;
aef9ec39 2880 struct srp_host *host;
52ede08f
BVA		 2881 int mr_page_shift, s, e, p;
2882 u64 max_pages_per_mr;
aef9ec39 2883
f5358a17
RD		 2884 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2885 if (!dev_attr)
cf311cd4 2886 return;
aef9ec39 2887
f5358a17 2888 if (ib_query_device(device, dev_attr)) {
e0bda7d8 2889 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 2890 goto free_attr;
2891 }
2892
2893 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2894 if (!srp_dev)
2895 goto free_attr;
2896
d1b4289e
BVA		 2897 srp_dev->has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
2898 device->map_phys_fmr && device->unmap_fmr);
2899
f5358a17
RD		 2900 /*
2901 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 2902 * minimum of 4096 bytes. We're unlikely to build large sglists
2903 * out of smaller entries.
f5358a17 2904 */
52ede08f
BVA		 2905 mr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2906 srp_dev->mr_page_size = 1 << mr_page_shift;
2907 srp_dev->mr_page_mask = ~((u64) srp_dev->mr_page_size - 1);
2908 max_pages_per_mr = dev_attr->max_mr_size;
2909 do_div(max_pages_per_mr, srp_dev->mr_page_size);
2910 srp_dev->max_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR,
2911 max_pages_per_mr);
2912 srp_dev->mr_max_size = srp_dev->mr_page_size *
2913 srp_dev->max_pages_per_mr;
2914 pr_debug("%s: mr_page_shift = %d, dev_attr->max_mr_size = %#llx, max_pages_per_mr = %d, mr_max_size = %#x\n",
2915 device->name, mr_page_shift, dev_attr->max_mr_size,
2916 srp_dev->max_pages_per_mr, srp_dev->mr_max_size);
f5358a17
RD		 2917
2918 INIT_LIST_HEAD(&srp_dev->dev_list);
2919
2920 srp_dev->dev = device;
2921 srp_dev->pd = ib_alloc_pd(device);
2922 if (IS_ERR(srp_dev->pd))
2923 goto free_dev;
2924
2925 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2926 IB_ACCESS_LOCAL_WRITE |
2927 IB_ACCESS_REMOTE_READ |
2928 IB_ACCESS_REMOTE_WRITE);
2929 if (IS_ERR(srp_dev->mr))
2930 goto err_pd;
2931
07ebafba 2932 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2933 s = 0;
2934 e = 0;
2935 } else {
2936 s = 1;
2937 e = device->phys_port_cnt;
2938 }
2939
2940 for (p = s; p <= e; ++p) {
f5358a17 2941 host = srp_add_port(srp_dev, p);
aef9ec39 2942 if (host)
f5358a17 2943 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2944 }
2945
f5358a17
RD		 2946 ib_set_client_data(device, &srp_client, srp_dev);
2947
2948 goto free_attr;
2949
2950err_pd:
2951 ib_dealloc_pd(srp_dev->pd);
2952
2953free_dev:
2954 kfree(srp_dev);
2955
2956free_attr:
2957 kfree(dev_attr);
aef9ec39
RD		 2958}
2959
2960static void srp_remove_one(struct ib_device *device)
2961{
f5358a17 2962 struct srp_device *srp_dev;
aef9ec39 2963 struct srp_host *host, *tmp_host;
ef6c49d8 2964 struct srp_target_port *target;
aef9ec39 2965
f5358a17 2966 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 2967 if (!srp_dev)
2968 return;
aef9ec39 2969
f5358a17 2970 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2971 device_unregister(&host->dev);
aef9ec39
RD		 2972 /*
2973 * Wait for the sysfs entry to go away, so that no new
2974 * target ports can be created.
2975 */
2976 wait_for_completion(&host->released);
2977
2978 /*
ef6c49d8 2979 * Remove all target ports.
aef9ec39 2980 */
b3589fd4 2981 spin_lock(&host->target_lock);
ef6c49d8
BVA		 2982 list_for_each_entry(target, &host->target_list, list)
2983 srp_queue_remove_work(target);
b3589fd4 2984 spin_unlock(&host->target_lock);
aef9ec39
RD		 2985
2986 /*
ef6c49d8 2987 * Wait for target port removal tasks.
aef9ec39 2988 */
ef6c49d8 2989 flush_workqueue(system_long_wq);
aef9ec39 2990
aef9ec39
RD		 2991 kfree(host);
2992 }
2993
f5358a17
RD		 2994 ib_dereg_mr(srp_dev->mr);
2995 ib_dealloc_pd(srp_dev->pd);
2996
2997 kfree(srp_dev);
aef9ec39
RD		 2998}
2999
3236822b 3000static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 3001 .has_rport_state = true,
3002 .reset_timer_if_blocked = true,
a95cadb9 3003 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 3004 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
3005 .dev_loss_tmo = &srp_dev_loss_tmo,
3006 .reconnect = srp_rport_reconnect,
dc1bdbd9 3007 .rport_delete = srp_rport_delete,
ed9b2264 3008 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 3009};
3010
aef9ec39
RD		 3011static int __init srp_init_module(void)
3012{
3013 int ret;
3014
dcb4cb85 3015 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 3016
49248644 3017 if (srp_sg_tablesize) {
e0bda7d8 3018 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 3019 if (!cmd_sg_entries)
3020 cmd_sg_entries = srp_sg_tablesize;
3021 }
3022
3023 if (!cmd_sg_entries)
3024 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
3025
3026 if (cmd_sg_entries > 255) {
e0bda7d8 3027 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 3028 cmd_sg_entries = 255;
1e89a194
DD		 3029 }
3030
c07d424d
DD		 3031 if (!indirect_sg_entries)
3032 indirect_sg_entries = cmd_sg_entries;
3033 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 3034 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
3035 cmd_sg_entries);
c07d424d
DD		 3036 indirect_sg_entries = cmd_sg_entries;
3037 }
3038
3236822b
FT		 3039 ib_srp_transport_template =
3040 srp_attach_transport(&ib_srp_transport_functions);
3041 if (!ib_srp_transport_template)
3042 return -ENOMEM;
3043
aef9ec39
RD		 3044 ret = class_register(&srp_class);
3045 if (ret) {
e0bda7d8 3046 pr_err("couldn't register class infiniband_srp\n");
3236822b 3047 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 3048 return ret;
3049 }
3050
c1a0b23b
MT		 3051 ib_sa_register_client(&srp_sa_client);
3052
aef9ec39
RD		 3053 ret = ib_register_client(&srp_client);
3054 if (ret) {
e0bda7d8 3055 pr_err("couldn't register IB client\n");
3236822b 3056 srp_release_transport(ib_srp_transport_template);
c1a0b23b 3057 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 3058 class_unregister(&srp_class);
3059 return ret;
3060 }
3061
3062 return 0;
3063}
3064
3065static void __exit srp_cleanup_module(void)
3066{
3067 ib_unregister_client(&srp_client);
c1a0b23b 3068 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 3069 class_unregister(&srp_class);
3236822b 3070 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 3071}
3072
3073module_init(srp_init_module);
3074module_exit(srp_cleanup_module);
Ubuntu Artful kernel mirror