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IB/srp: Fix a sporadic crash triggered by cable pulling
[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
aef9ec39
RD		 31 */
32
e0bda7d8
BVA		 33#define pr_fmt(fmt) PFX fmt
34
aef9ec39
RD		 35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/string.h>
40#include <linux/parser.h>
41#include <linux/random.h>
de25968c 42#include <linux/jiffies.h>
aef9ec39 43
60063497 44#include <linux/atomic.h>
aef9ec39
RD		 45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
71444b97 49#include <scsi/scsi_tcq.h>
aef9ec39 50#include <scsi/srp.h>
3236822b 51#include <scsi/scsi_transport_srp.h>
aef9ec39 52
aef9ec39
RD		 53#include "ib_srp.h"
54
55#define DRV_NAME "ib_srp"
56#define PFX DRV_NAME ": "
e8ca4135
VP		 57#define DRV_VERSION "1.0"
58#define DRV_RELDATE "July 1, 2013"
aef9ec39
RD		 59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
49248644
DD		 65static unsigned int srp_sg_tablesize;
66static unsigned int cmd_sg_entries;
c07d424d
DD		 67static unsigned int indirect_sg_entries;
68static bool allow_ext_sg;
49248644 69static int topspin_workarounds = 1;
74b0a15b 70
49248644
DD		 71module_param(srp_sg_tablesize, uint, 0444);
72MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
74b0a15b 73
49248644
DD		 74module_param(cmd_sg_entries, uint, 0444);
75MODULE_PARM_DESC(cmd_sg_entries,
76 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
aef9ec39 77
c07d424d
DD		 78module_param(indirect_sg_entries, uint, 0444);
79MODULE_PARM_DESC(indirect_sg_entries,
80 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
81
82module_param(allow_ext_sg, bool, 0444);
83MODULE_PARM_DESC(allow_ext_sg,
84 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
85
aef9ec39
RD		 86module_param(topspin_workarounds, int, 0444);
87MODULE_PARM_DESC(topspin_workarounds,
88 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
89
ed9b2264
BVA		 90static struct kernel_param_ops srp_tmo_ops;
91
a95cadb9
BVA		 92static int srp_reconnect_delay = 10;
93module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
94 S_IRUGO | S_IWUSR);
95MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
96
ed9b2264
BVA		 97static int srp_fast_io_fail_tmo = 15;
98module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
99 S_IRUGO | S_IWUSR);
100MODULE_PARM_DESC(fast_io_fail_tmo,
101 "Number of seconds between the observation of a transport"
102 " layer error and failing all I/O. \"off\" means that this"
103 " functionality is disabled.");
104
a95cadb9 105static int srp_dev_loss_tmo = 600;
ed9b2264
BVA		 106module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
107 S_IRUGO | S_IWUSR);
108MODULE_PARM_DESC(dev_loss_tmo,
109 "Maximum number of seconds that the SRP transport should"
110 " insulate transport layer errors. After this time has been"
111 " exceeded the SCSI host is removed. Should be"
112 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
113 " if fast_io_fail_tmo has not been set. \"off\" means that"
114 " this functionality is disabled.");
115
aef9ec39
RD		 116static void srp_add_one(struct ib_device *device);
117static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 118static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
119static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 120static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
121
3236822b
FT		 122static struct scsi_transport_template *ib_srp_transport_template;
123
aef9ec39
RD		 124static struct ib_client srp_client = {
125 .name = "srp",
126 .add = srp_add_one,
127 .remove = srp_remove_one
128};
129
c1a0b23b
MT		 130static struct ib_sa_client srp_sa_client;
131
ed9b2264
BVA		 132static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
133{
134 int tmo = *(int *)kp->arg;
135
136 if (tmo >= 0)
137 return sprintf(buffer, "%d", tmo);
138 else
139 return sprintf(buffer, "off");
140}
141
142static int srp_tmo_set(const char *val, const struct kernel_param *kp)
143{
144 int tmo, res;
145
146 if (strncmp(val, "off", 3) != 0) {
147 res = kstrtoint(val, 0, &tmo);
148 if (res)
149 goto out;
150 } else {
151 tmo = -1;
152 }
a95cadb9
BVA		 153 if (kp->arg == &srp_reconnect_delay)
154 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
155 srp_dev_loss_tmo);
156 else if (kp->arg == &srp_fast_io_fail_tmo)
157 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
ed9b2264 158 else
a95cadb9
BVA		 159 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
160 tmo);
ed9b2264
BVA		 161 if (res)
162 goto out;
163 *(int *)kp->arg = tmo;
164
165out:
166 return res;
167}
168
169static struct kernel_param_ops srp_tmo_ops = {
170 .get = srp_tmo_get,
171 .set = srp_tmo_set,
172};
173
aef9ec39
RD		 174static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
175{
176 return (struct srp_target_port *) host->hostdata;
177}
178
179static const char *srp_target_info(struct Scsi_Host *host)
180{
181 return host_to_target(host)->target_name;
182}
183
5d7cbfd6
RD		 184static int srp_target_is_topspin(struct srp_target_port *target)
185{
186 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 187 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 188
189 return topspin_workarounds &&
3d1ff48d
RK		 190 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
191 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 192}
193
aef9ec39
RD		 194static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
195 gfp_t gfp_mask,
196 enum dma_data_direction direction)
197{
198 struct srp_iu *iu;
199
200 iu = kmalloc(sizeof *iu, gfp_mask);
201 if (!iu)
202 goto out;
203
204 iu->buf = kzalloc(size, gfp_mask);
205 if (!iu->buf)
206 goto out_free_iu;
207
05321937
GKH		 208 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
209 direction);
210 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 211 goto out_free_buf;
212
213 iu->size = size;
214 iu->direction = direction;
215
216 return iu;
217
218out_free_buf:
219 kfree(iu->buf);
220out_free_iu:
221 kfree(iu);
222out:
223 return NULL;
224}
225
226static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
227{
228 if (!iu)
229 return;
230
05321937
GKH		 231 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
232 iu->direction);
aef9ec39
RD		 233 kfree(iu->buf);
234 kfree(iu);
235}
236
237static void srp_qp_event(struct ib_event *event, void *context)
238{
e0bda7d8 239 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 240}
241
242static int srp_init_qp(struct srp_target_port *target,
243 struct ib_qp *qp)
244{
245 struct ib_qp_attr *attr;
246 int ret;
247
248 attr = kmalloc(sizeof *attr, GFP_KERNEL);
249 if (!attr)
250 return -ENOMEM;
251
969a60f9
RD		 252 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
253 target->srp_host->port,
254 be16_to_cpu(target->path.pkey),
255 &attr->pkey_index);
aef9ec39
RD		 256 if (ret)
257 goto out;
258
259 attr->qp_state = IB_QPS_INIT;
260 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
261 IB_ACCESS_REMOTE_WRITE);
262 attr->port_num = target->srp_host->port;
263
264 ret = ib_modify_qp(qp, attr,
265 IB_QP_STATE |
266 IB_QP_PKEY_INDEX |
267 IB_QP_ACCESS_FLAGS |
268 IB_QP_PORT);
269
270out:
271 kfree(attr);
272 return ret;
273}
274
9fe4bcf4
DD		 275static int srp_new_cm_id(struct srp_target_port *target)
276{
277 struct ib_cm_id *new_cm_id;
278
05321937 279 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 280 srp_cm_handler, target);
281 if (IS_ERR(new_cm_id))
282 return PTR_ERR(new_cm_id);
283
284 if (target->cm_id)
285 ib_destroy_cm_id(target->cm_id);
286 target->cm_id = new_cm_id;
287
288 return 0;
289}
290
aef9ec39
RD		 291static int srp_create_target_ib(struct srp_target_port *target)
292{
293 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 294 struct ib_cq *recv_cq, *send_cq;
295 struct ib_qp *qp;
aef9ec39
RD		 296 int ret;
297
298 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
299 if (!init_attr)
300 return -ENOMEM;
301
73aa89ed 302 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
4d73f95f
BVA		 303 srp_recv_completion, NULL, target,
304 target->queue_size, target->comp_vector);
73aa89ed
IR		 305 if (IS_ERR(recv_cq)) {
306 ret = PTR_ERR(recv_cq);
da9d2f07 307 goto err;
aef9ec39
RD		 308 }
309
73aa89ed 310 send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
4d73f95f
BVA		 311 srp_send_completion, NULL, target,
312 target->queue_size, target->comp_vector);
73aa89ed
IR		 313 if (IS_ERR(send_cq)) {
314 ret = PTR_ERR(send_cq);
da9d2f07 315 goto err_recv_cq;
9c03dc9f
BVA		 316 }
317
73aa89ed 318 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 319
320 init_attr->event_handler = srp_qp_event;
4d73f95f
BVA		 321 init_attr->cap.max_send_wr = target->queue_size;
322 init_attr->cap.max_recv_wr = target->queue_size;
aef9ec39
RD		 323 init_attr->cap.max_recv_sge = 1;
324 init_attr->cap.max_send_sge = 1;
325 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
326 init_attr->qp_type = IB_QPT_RC;
73aa89ed
IR		 327 init_attr->send_cq = send_cq;
328 init_attr->recv_cq = recv_cq;
aef9ec39 329
73aa89ed
IR		 330 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
331 if (IS_ERR(qp)) {
332 ret = PTR_ERR(qp);
da9d2f07 333 goto err_send_cq;
aef9ec39
RD		 334 }
335
73aa89ed 336 ret = srp_init_qp(target, qp);
da9d2f07
RD		 337 if (ret)
338 goto err_qp;
aef9ec39 339
73aa89ed
IR		 340 if (target->qp)
341 ib_destroy_qp(target->qp);
342 if (target->recv_cq)
343 ib_destroy_cq(target->recv_cq);
344 if (target->send_cq)
345 ib_destroy_cq(target->send_cq);
346
347 target->qp = qp;
348 target->recv_cq = recv_cq;
349 target->send_cq = send_cq;
350
da9d2f07
RD		 351 kfree(init_attr);
352 return 0;
353
354err_qp:
73aa89ed 355 ib_destroy_qp(qp);
da9d2f07
RD		 356
357err_send_cq:
73aa89ed 358 ib_destroy_cq(send_cq);
da9d2f07
RD		 359
360err_recv_cq:
73aa89ed 361 ib_destroy_cq(recv_cq);
da9d2f07
RD		 362
363err:
aef9ec39
RD		 364 kfree(init_attr);
365 return ret;
366}
367
4d73f95f
BVA		 368/*
369 * Note: this function may be called without srp_alloc_iu_bufs() having been
370 * invoked. Hence the target->[rt]x_ring checks.
371 */
aef9ec39
RD		 372static void srp_free_target_ib(struct srp_target_port *target)
373{
374 int i;
375
376 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 377 ib_destroy_cq(target->send_cq);
378 ib_destroy_cq(target->recv_cq);
aef9ec39 379
73aa89ed
IR		 380 target->qp = NULL;
381 target->send_cq = target->recv_cq = NULL;
382
4d73f95f
BVA		 383 if (target->rx_ring) {
384 for (i = 0; i < target->queue_size; ++i)
385 srp_free_iu(target->srp_host, target->rx_ring[i]);
386 kfree(target->rx_ring);
387 target->rx_ring = NULL;
388 }
389 if (target->tx_ring) {
390 for (i = 0; i < target->queue_size; ++i)
391 srp_free_iu(target->srp_host, target->tx_ring[i]);
392 kfree(target->tx_ring);
393 target->tx_ring = NULL;
394 }
aef9ec39
RD		 395}
396
397static void srp_path_rec_completion(int status,
398 struct ib_sa_path_rec *pathrec,
399 void *target_ptr)
400{
401 struct srp_target_port *target = target_ptr;
402
403 target->status = status;
404 if (status)
7aa54bd7
DD		 405 shost_printk(KERN_ERR, target->scsi_host,
406 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 407 else
408 target->path = *pathrec;
409 complete(&target->done);
410}
411
412static int srp_lookup_path(struct srp_target_port *target)
413{
a702adce
BVA		 414 int ret;
415
aef9ec39
RD		 416 target->path.numb_path = 1;
417
418 init_completion(&target->done);
419
c1a0b23b 420 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 421 target->srp_host->srp_dev->dev,
aef9ec39
RD		 422 target->srp_host->port,
423 &target->path,
247e020e 424 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 425 IB_SA_PATH_REC_DGID |
426 IB_SA_PATH_REC_SGID |
427 IB_SA_PATH_REC_NUMB_PATH |
428 IB_SA_PATH_REC_PKEY,
429 SRP_PATH_REC_TIMEOUT_MS,
430 GFP_KERNEL,
431 srp_path_rec_completion,
432 target, &target->path_query);
433 if (target->path_query_id < 0)
434 return target->path_query_id;
435
a702adce
BVA		 436 ret = wait_for_completion_interruptible(&target->done);
437 if (ret < 0)
438 return ret;
aef9ec39
RD		 439
440 if (target->status < 0)
7aa54bd7
DD		 441 shost_printk(KERN_WARNING, target->scsi_host,
442 PFX "Path record query failed\n");
aef9ec39
RD		 443
444 return target->status;
445}
446
447static int srp_send_req(struct srp_target_port *target)
448{
449 struct {
450 struct ib_cm_req_param param;
451 struct srp_login_req priv;
452 } *req = NULL;
453 int status;
454
455 req = kzalloc(sizeof *req, GFP_KERNEL);
456 if (!req)
457 return -ENOMEM;
458
459 req->param.primary_path = &target->path;
460 req->param.alternate_path = NULL;
461 req->param.service_id = target->service_id;
462 req->param.qp_num = target->qp->qp_num;
463 req->param.qp_type = target->qp->qp_type;
464 req->param.private_data = &req->priv;
465 req->param.private_data_len = sizeof req->priv;
466 req->param.flow_control = 1;
467
468 get_random_bytes(&req->param.starting_psn, 4);
469 req->param.starting_psn &= 0xffffff;
470
471 /*
472 * Pick some arbitrary defaults here; we could make these
473 * module parameters if anyone cared about setting them.
474 */
475 req->param.responder_resources = 4;
476 req->param.remote_cm_response_timeout = 20;
477 req->param.local_cm_response_timeout = 20;
7bb312e4 478 req->param.retry_count = target->tl_retry_count;
aef9ec39
RD		 479 req->param.rnr_retry_count = 7;
480 req->param.max_cm_retries = 15;
481
482 req->priv.opcode = SRP_LOGIN_REQ;
483 req->priv.tag = 0;
49248644 484 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 485 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
486 SRP_BUF_FORMAT_INDIRECT);
0c0450db 487 /*
3cd96564 488 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 489 * port identifier format is 8 bytes of ID extension followed
490 * by 8 bytes of GUID. Older drafts put the two halves in the
491 * opposite order, so that the GUID comes first.
492 *
493 * Targets conforming to these obsolete drafts can be
494 * recognized by the I/O Class they report.
495 */
496 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
497 memcpy(req->priv.initiator_port_id,
01cb9bcb 498 &target->path.sgid.global.interface_id, 8);
0c0450db 499 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 500 &target->initiator_ext, 8);
0c0450db
R		 501 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
502 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
503 } else {
504 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 505 &target->initiator_ext, 8);
506 memcpy(req->priv.initiator_port_id + 8,
507 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 508 memcpy(req->priv.target_port_id, &target->id_ext, 8);
509 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
510 }
511
aef9ec39
RD		 512 /*
513 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 514 * zero out the first 8 bytes of our initiator port ID and set
515 * the second 8 bytes to the local node GUID.
aef9ec39 516 */
5d7cbfd6 517 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 518 shost_printk(KERN_DEBUG, target->scsi_host,
519 PFX "Topspin/Cisco initiator port ID workaround "
520 "activated for target GUID %016llx\n",
521 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 522 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 523 memcpy(req->priv.initiator_port_id + 8,
05321937 524 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 525 }
aef9ec39
RD		 526
527 status = ib_send_cm_req(target->cm_id, &req->param);
528
529 kfree(req);
530
531 return status;
532}
533
ef6c49d8
BVA		 534static bool srp_queue_remove_work(struct srp_target_port *target)
535{
536 bool changed = false;
537
538 spin_lock_irq(&target->lock);
539 if (target->state != SRP_TARGET_REMOVED) {
540 target->state = SRP_TARGET_REMOVED;
541 changed = true;
542 }
543 spin_unlock_irq(&target->lock);
544
545 if (changed)
546 queue_work(system_long_wq, &target->remove_work);
547
548 return changed;
549}
550
294c875a
BVA		 551static bool srp_change_conn_state(struct srp_target_port *target,
552 bool connected)
553{
554 bool changed = false;
555
556 spin_lock_irq(&target->lock);
557 if (target->connected != connected) {
558 target->connected = connected;
559 changed = true;
560 }
561 spin_unlock_irq(&target->lock);
562
563 return changed;
564}
565
aef9ec39
RD		 566static void srp_disconnect_target(struct srp_target_port *target)
567{
294c875a
BVA		 568 if (srp_change_conn_state(target, false)) {
569 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 570
294c875a
BVA		 571 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
572 shost_printk(KERN_DEBUG, target->scsi_host,
573 PFX "Sending CM DREQ failed\n");
294c875a 574 }
e6581056 575 }
aef9ec39
RD		 576}
577
8f26c9ff
DD		 578static void srp_free_req_data(struct srp_target_port *target)
579{
c07d424d 580 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
8f26c9ff
DD		 581 struct srp_request *req;
582 int i;
583
4d73f95f
BVA		 584 if (!target->req_ring)
585 return;
586
587 for (i = 0; i < target->req_ring_size; ++i) {
588 req = &target->req_ring[i];
8f26c9ff
DD		 589 kfree(req->fmr_list);
590 kfree(req->map_page);
c07d424d
DD		 591 if (req->indirect_dma_addr) {
592 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
593 target->indirect_size,
594 DMA_TO_DEVICE);
595 }
596 kfree(req->indirect_desc);
8f26c9ff 597 }
4d73f95f
BVA		 598
599 kfree(target->req_ring);
600 target->req_ring = NULL;
8f26c9ff
DD		 601}
602
b81d00bd
BVA		 603static int srp_alloc_req_data(struct srp_target_port *target)
604{
605 struct srp_device *srp_dev = target->srp_host->srp_dev;
606 struct ib_device *ibdev = srp_dev->dev;
607 struct srp_request *req;
608 dma_addr_t dma_addr;
609 int i, ret = -ENOMEM;
610
611 INIT_LIST_HEAD(&target->free_reqs);
612
4d73f95f
BVA		 613 target->req_ring = kzalloc(target->req_ring_size *
614 sizeof(*target->req_ring), GFP_KERNEL);
615 if (!target->req_ring)
616 goto out;
617
618 for (i = 0; i < target->req_ring_size; ++i) {
b81d00bd
BVA		 619 req = &target->req_ring[i];
620 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
621 GFP_KERNEL);
622 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof(void *),
623 GFP_KERNEL);
624 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
625 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
626 goto out;
627
628 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
629 target->indirect_size,
630 DMA_TO_DEVICE);
631 if (ib_dma_mapping_error(ibdev, dma_addr))
632 goto out;
633
634 req->indirect_dma_addr = dma_addr;
635 req->index = i;
636 list_add_tail(&req->list, &target->free_reqs);
637 }
638 ret = 0;
639
640out:
641 return ret;
642}
643
683b159a
BVA		 644/**
645 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
646 * @shost: SCSI host whose attributes to remove from sysfs.
647 *
648 * Note: Any attributes defined in the host template and that did not exist
649 * before invocation of this function will be ignored.
650 */
651static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
652{
653 struct device_attribute **attr;
654
655 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
656 device_remove_file(&shost->shost_dev, *attr);
657}
658
ee12d6a8
BVA		 659static void srp_remove_target(struct srp_target_port *target)
660{
ef6c49d8
BVA		 661 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
662
ee12d6a8 663 srp_del_scsi_host_attr(target->scsi_host);
9dd69a60 664 srp_rport_get(target->rport);
ee12d6a8
BVA		 665 srp_remove_host(target->scsi_host);
666 scsi_remove_host(target->scsi_host);
93079162 667 srp_stop_rport_timers(target->rport);
ef6c49d8 668 srp_disconnect_target(target);
ee12d6a8
BVA		 669 ib_destroy_cm_id(target->cm_id);
670 srp_free_target_ib(target);
c1120f89 671 cancel_work_sync(&target->tl_err_work);
9dd69a60 672 srp_rport_put(target->rport);
ee12d6a8 673 srp_free_req_data(target);
65d7dd2f
VP		 674
675 spin_lock(&target->srp_host->target_lock);
676 list_del(&target->list);
677 spin_unlock(&target->srp_host->target_lock);
678
ee12d6a8
BVA		 679 scsi_host_put(target->scsi_host);
680}
681
c4028958 682static void srp_remove_work(struct work_struct *work)
aef9ec39 683{
c4028958 684 struct srp_target_port *target =
ef6c49d8 685 container_of(work, struct srp_target_port, remove_work);
aef9ec39 686
ef6c49d8 687 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 688
96fc248a 689 srp_remove_target(target);
aef9ec39
RD		 690}
691
dc1bdbd9
BVA		 692static void srp_rport_delete(struct srp_rport *rport)
693{
694 struct srp_target_port *target = rport->lld_data;
695
696 srp_queue_remove_work(target);
697}
698
aef9ec39
RD		 699static int srp_connect_target(struct srp_target_port *target)
700{
9fe4bcf4 701 int retries = 3;
aef9ec39
RD		 702 int ret;
703
294c875a
BVA		 704 WARN_ON_ONCE(target->connected);
705
948d1e88
BVA		 706 target->qp_in_error = false;
707
aef9ec39
RD		 708 ret = srp_lookup_path(target);
709 if (ret)
710 return ret;
711
712 while (1) {
713 init_completion(&target->done);
714 ret = srp_send_req(target);
715 if (ret)
716 return ret;
a702adce
BVA		 717 ret = wait_for_completion_interruptible(&target->done);
718 if (ret < 0)
719 return ret;
aef9ec39
RD		 720
721 /*
722 * The CM event handling code will set status to
723 * SRP_PORT_REDIRECT if we get a port redirect REJ
724 * back, or SRP_DLID_REDIRECT if we get a lid/qp
725 * redirect REJ back.
726 */
727 switch (target->status) {
728 case 0:
294c875a 729 srp_change_conn_state(target, true);
aef9ec39
RD		 730 return 0;
731
732 case SRP_PORT_REDIRECT:
733 ret = srp_lookup_path(target);
734 if (ret)
735 return ret;
736 break;
737
738 case SRP_DLID_REDIRECT:
739 break;
740
9fe4bcf4
DD		 741 case SRP_STALE_CONN:
742 /* Our current CM id was stale, and is now in timewait.
743 * Try to reconnect with a new one.
744 */
745 if (!retries-- || srp_new_cm_id(target)) {
746 shost_printk(KERN_ERR, target->scsi_host, PFX
747 "giving up on stale connection\n");
748 target->status = -ECONNRESET;
749 return target->status;
750 }
751
752 shost_printk(KERN_ERR, target->scsi_host, PFX
753 "retrying stale connection\n");
754 break;
755
aef9ec39
RD		 756 default:
757 return target->status;
758 }
759 }
760}
761
d945e1df
RD		 762static void srp_unmap_data(struct scsi_cmnd *scmnd,
763 struct srp_target_port *target,
764 struct srp_request *req)
765{
8f26c9ff
DD		 766 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
767 struct ib_pool_fmr **pfmr;
768
bb350d1d 769 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 770 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
771 scmnd->sc_data_direction != DMA_FROM_DEVICE))
772 return;
773
8f26c9ff
DD		 774 pfmr = req->fmr_list;
775 while (req->nfmr--)
776 ib_fmr_pool_unmap(*pfmr++);
f5358a17 777
8f26c9ff
DD		 778 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
779 scmnd->sc_data_direction);
d945e1df
RD		 780}
781
22032991
BVA		 782/**
783 * srp_claim_req - Take ownership of the scmnd associated with a request.
784 * @target: SRP target port.
785 * @req: SRP request.
b3fe628d 786 * @sdev: If not NULL, only take ownership for this SCSI device.
22032991
BVA		 787 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
788 * ownership of @req->scmnd if it equals @scmnd.
789 *
790 * Return value:
791 * Either NULL or a pointer to the SCSI command the caller became owner of.
792 */
793static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
794 struct srp_request *req,
b3fe628d 795 struct scsi_device *sdev,
22032991
BVA		 796 struct scsi_cmnd *scmnd)
797{
798 unsigned long flags;
799
800 spin_lock_irqsave(&target->lock, flags);
b3fe628d
BVA		 801 if (req->scmnd &&
802 (!sdev || req->scmnd->device == sdev) &&
803 (!scmnd || req->scmnd == scmnd)) {
22032991
BVA		 804 scmnd = req->scmnd;
805 req->scmnd = NULL;
22032991
BVA		 806 } else {
807 scmnd = NULL;
808 }
809 spin_unlock_irqrestore(&target->lock, flags);
810
811 return scmnd;
812}
813
814/**
815 * srp_free_req() - Unmap data and add request to the free request list.
816 */
817static void srp_free_req(struct srp_target_port *target,
818 struct srp_request *req, struct scsi_cmnd *scmnd,
819 s32 req_lim_delta)
526b4caa 820{
94a9174c
BVA		 821 unsigned long flags;
822
22032991
BVA		 823 srp_unmap_data(scmnd, target, req);
824
e9684678 825 spin_lock_irqsave(&target->lock, flags);
94a9174c 826 target->req_lim += req_lim_delta;
536ae14e 827 list_add_tail(&req->list, &target->free_reqs);
e9684678 828 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 829}
830
ed9b2264 831static void srp_finish_req(struct srp_target_port *target,
b3fe628d
BVA		 832 struct srp_request *req, struct scsi_device *sdev,
833 int result)
526b4caa 834{
b3fe628d 835 struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
22032991
BVA		 836
837 if (scmnd) {
9b796d06 838 srp_free_req(target, req, scmnd, 0);
ed9b2264 839 scmnd->result = result;
22032991 840 scmnd->scsi_done(scmnd);
22032991 841 }
526b4caa
IR		 842}
843
ed9b2264 844static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 845{
ed9b2264 846 struct srp_target_port *target = rport->lld_data;
b3fe628d
BVA		 847 struct Scsi_Host *shost = target->scsi_host;
848 struct scsi_device *sdev;
ed9b2264
BVA		 849 int i;
850
b3fe628d
BVA		 851 /*
852 * Invoking srp_terminate_io() while srp_queuecommand() is running
853 * is not safe. Hence the warning statement below.
854 */
855 shost_for_each_device(sdev, shost)
856 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
857
4d73f95f 858 for (i = 0; i < target->req_ring_size; ++i) {
ed9b2264 859 struct srp_request *req = &target->req_ring[i];
b3fe628d 860 srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
ed9b2264
BVA		 861 }
862}
aef9ec39 863
ed9b2264
BVA		 864/*
865 * It is up to the caller to ensure that srp_rport_reconnect() calls are
866 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
867 * srp_reset_device() or srp_reset_host() calls will occur while this function
868 * is in progress. One way to realize that is not to call this function
869 * directly but to call srp_reconnect_rport() instead since that last function
870 * serializes calls of this function via rport->mutex and also blocks
871 * srp_queuecommand() calls before invoking this function.
872 */
873static int srp_rport_reconnect(struct srp_rport *rport)
874{
875 struct srp_target_port *target = rport->lld_data;
876 int i, ret;
09be70a2 877
aef9ec39
RD		 878 srp_disconnect_target(target);
879 /*
c7c4e7ff
BVA		 880 * Now get a new local CM ID so that we avoid confusing the target in
881 * case things are really fouled up. Doing so also ensures that all CM
882 * callbacks will have finished before a new QP is allocated.
aef9ec39 883 */
9fe4bcf4 884 ret = srp_new_cm_id(target);
c7c4e7ff
BVA		 885 /*
886 * Whether or not creating a new CM ID succeeded, create a new
887 * QP. This guarantees that all completion callback function
888 * invocations have finished before request resetting starts.
889 */
890 if (ret == 0)
891 ret = srp_create_target_ib(target);
892 else
893 srp_create_target_ib(target);
aef9ec39 894
4d73f95f 895 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 896 struct srp_request *req = &target->req_ring[i];
b3fe628d 897 srp_finish_req(target, req, NULL, DID_RESET << 16);
536ae14e 898 }
aef9ec39 899
536ae14e 900 INIT_LIST_HEAD(&target->free_tx);
4d73f95f 901 for (i = 0; i < target->queue_size; ++i)
536ae14e 902 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 903
c7c4e7ff
BVA		 904 if (ret == 0)
905 ret = srp_connect_target(target);
09be70a2 906
ed9b2264
BVA		 907 if (ret == 0)
908 shost_printk(KERN_INFO, target->scsi_host,
909 PFX "reconnect succeeded\n");
aef9ec39
RD		 910
911 return ret;
912}
913
8f26c9ff
DD		 914static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
915 unsigned int dma_len, u32 rkey)
f5358a17 916{
8f26c9ff 917 struct srp_direct_buf *desc = state->desc;
f5358a17 918
8f26c9ff
DD		 919 desc->va = cpu_to_be64(dma_addr);
920 desc->key = cpu_to_be32(rkey);
921 desc->len = cpu_to_be32(dma_len);
f5358a17 922
8f26c9ff
DD		 923 state->total_len += dma_len;
924 state->desc++;
925 state->ndesc++;
926}
559ce8f1 927
8f26c9ff
DD		 928static int srp_map_finish_fmr(struct srp_map_state *state,
929 struct srp_target_port *target)
930{
931 struct srp_device *dev = target->srp_host->srp_dev;
932 struct ib_pool_fmr *fmr;
933 u64 io_addr = 0;
85507bcc 934
8f26c9ff
DD		 935 if (!state->npages)
936 return 0;
f5358a17 937
8f26c9ff
DD		 938 if (state->npages == 1) {
939 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
940 target->rkey);
941 state->npages = state->fmr_len = 0;
942 return 0;
f5358a17
RD		 943 }
944
8f26c9ff
DD		 945 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
946 state->npages, io_addr);
947 if (IS_ERR(fmr))
948 return PTR_ERR(fmr);
f5358a17 949
8f26c9ff
DD		 950 *state->next_fmr++ = fmr;
951 state->nfmr++;
f5358a17 952
8f26c9ff
DD		 953 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
954 state->npages = state->fmr_len = 0;
955 return 0;
956}
957
958static void srp_map_update_start(struct srp_map_state *state,
959 struct scatterlist *sg, int sg_index,
960 dma_addr_t dma_addr)
961{
962 state->unmapped_sg = sg;
963 state->unmapped_index = sg_index;
964 state->unmapped_addr = dma_addr;
965}
85507bcc 966
8f26c9ff
DD		 967static int srp_map_sg_entry(struct srp_map_state *state,
968 struct srp_target_port *target,
969 struct scatterlist *sg, int sg_index,
970 int use_fmr)
971{
972 struct srp_device *dev = target->srp_host->srp_dev;
973 struct ib_device *ibdev = dev->dev;
974 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
975 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
976 unsigned int len;
977 int ret;
978
979 if (!dma_len)
980 return 0;
981
982 if (use_fmr == SRP_MAP_NO_FMR) {
983 /* Once we're in direct map mode for a request, we don't
984 * go back to FMR mode, so no need to update anything
985 * other than the descriptor.
986 */
987 srp_map_desc(state, dma_addr, dma_len, target->rkey);
988 return 0;
85507bcc 989 }
f5358a17 990
8f26c9ff
DD		 991 /* If we start at an offset into the FMR page, don't merge into
992 * the current FMR. Finish it out, and use the kernel's MR for this
993 * sg entry. This is to avoid potential bugs on some SRP targets
994 * that were never quite defined, but went away when the initiator
995 * avoided using FMR on such page fragments.
996 */
997 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
998 ret = srp_map_finish_fmr(state, target);
999 if (ret)
1000 return ret;
1001
1002 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1003 srp_map_update_start(state, NULL, 0, 0);
1004 return 0;
f5358a17
RD		 1005 }
1006
8f26c9ff
DD		 1007 /* If this is the first sg to go into the FMR, save our position.
1008 * We need to know the first unmapped entry, its index, and the
1009 * first unmapped address within that entry to be able to restart
1010 * mapping after an error.
1011 */
1012 if (!state->unmapped_sg)
1013 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 1014
8f26c9ff
DD		 1015 while (dma_len) {
1016 if (state->npages == SRP_FMR_SIZE) {
1017 ret = srp_map_finish_fmr(state, target);
1018 if (ret)
1019 return ret;
f5358a17 1020
8f26c9ff
DD		 1021 srp_map_update_start(state, sg, sg_index, dma_addr);
1022 }
1023
1024 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
f5358a17 1025
8f26c9ff
DD		 1026 if (!state->npages)
1027 state->base_dma_addr = dma_addr;
1028 state->pages[state->npages++] = dma_addr;
1029 state->fmr_len += len;
1030 dma_addr += len;
1031 dma_len -= len;
1032 }
1033
1034 /* If the last entry of the FMR wasn't a full page, then we need to
1035 * close it out and start a new one -- we can only merge at page
1036 * boundries.
1037 */
1038 ret = 0;
1039 if (len != dev->fmr_page_size) {
1040 ret = srp_map_finish_fmr(state, target);
1041 if (!ret)
1042 srp_map_update_start(state, NULL, 0, 0);
1043 }
f5358a17
RD		 1044 return ret;
1045}
1046
aef9ec39
RD		 1047static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1048 struct srp_request *req)
1049{
8f26c9ff 1050 struct scatterlist *scat, *sg;
aef9ec39 1051 struct srp_cmd *cmd = req->cmd->buf;
8f26c9ff 1052 int i, len, nents, count, use_fmr;
85507bcc
RC		 1053 struct srp_device *dev;
1054 struct ib_device *ibdev;
8f26c9ff
DD		 1055 struct srp_map_state state;
1056 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 1057 u32 table_len;
1058 u8 fmt;
aef9ec39 1059
bb350d1d 1060 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 1061 return sizeof (struct srp_cmd);
1062
1063 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1064 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 1065 shost_printk(KERN_WARNING, target->scsi_host,
1066 PFX "Unhandled data direction %d\n",
1067 scmnd->sc_data_direction);
aef9ec39
RD		 1068 return -EINVAL;
1069 }
1070
bb350d1d
FT		 1071 nents = scsi_sg_count(scmnd);
1072 scat = scsi_sglist(scmnd);
aef9ec39 1073
05321937 1074 dev = target->srp_host->srp_dev;
85507bcc
RC		 1075 ibdev = dev->dev;
1076
1077 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 1078 if (unlikely(count == 0))
1079 return -EIO;
f5358a17
RD		 1080
1081 fmt = SRP_DATA_DESC_DIRECT;
1082 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1083
cf368713 1084 if (count == 1) {
f5358a17
RD		 1085 /*
1086 * The midlayer only generated a single gather/scatter
1087 * entry, or DMA mapping coalesced everything to a
1088 * single entry. So a direct descriptor along with
1089 * the DMA MR suffices.
1090 */
cf368713 1091 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1092
85507bcc 1093 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1094 buf->key = cpu_to_be32(target->rkey);
85507bcc 1095 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff
DD		 1096
1097 req->nfmr = 0;
1098 goto map_complete;
1099 }
1100
1101 /* We have more than one scatter/gather entry, so build our indirect
1102 * descriptor table, trying to merge as many entries with FMR as we
1103 * can.
1104 */
1105 indirect_hdr = (void *) cmd->add_data;
1106
c07d424d
DD		 1107 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1108 target->indirect_size, DMA_TO_DEVICE);
1109
8f26c9ff 1110 memset(&state, 0, sizeof(state));
c07d424d 1111 state.desc = req->indirect_desc;
8f26c9ff
DD		 1112 state.pages = req->map_page;
1113 state.next_fmr = req->fmr_list;
1114
1115 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
1116
1117 for_each_sg(scat, sg, count, i) {
1118 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
1119 /* FMR mapping failed, so backtrack to the first
1120 * unmapped entry and continue on without using FMR.
1121 */
1122 dma_addr_t dma_addr;
1123 unsigned int dma_len;
1124
1125backtrack:
1126 sg = state.unmapped_sg;
1127 i = state.unmapped_index;
1128
1129 dma_addr = ib_sg_dma_address(ibdev, sg);
1130 dma_len = ib_sg_dma_len(ibdev, sg);
1131 dma_len -= (state.unmapped_addr - dma_addr);
1132 dma_addr = state.unmapped_addr;
1133 use_fmr = SRP_MAP_NO_FMR;
1134 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
f5358a17 1135 }
8f26c9ff 1136 }
aef9ec39 1137
8f26c9ff
DD		 1138 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
1139 goto backtrack;
cf368713 1140
c07d424d
DD		 1141 /* We've mapped the request, now pull as much of the indirect
1142 * descriptor table as we can into the command buffer. If this
1143 * target is not using an external indirect table, we are
1144 * guaranteed to fit into the command, as the SCSI layer won't
1145 * give us more S/G entries than we allow.
8f26c9ff
DD		 1146 */
1147 req->nfmr = state.nfmr;
1148 if (state.ndesc == 1) {
1149 /* FMR mapping was able to collapse this to one entry,
1150 * so use a direct descriptor.
1151 */
1152 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1153
c07d424d 1154 *buf = req->indirect_desc[0];
8f26c9ff 1155 goto map_complete;
aef9ec39
RD		 1156 }
1157
c07d424d
DD		 1158 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1159 !target->allow_ext_sg)) {
1160 shost_printk(KERN_ERR, target->scsi_host,
1161 "Could not fit S/G list into SRP_CMD\n");
1162 return -EIO;
1163 }
1164
1165 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1166 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1167
1168 fmt = SRP_DATA_DESC_INDIRECT;
1169 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1170 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1171
c07d424d
DD		 1172 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1173 count * sizeof (struct srp_direct_buf));
8f26c9ff 1174
c07d424d 1175 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1176 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1177 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1178 indirect_hdr->len = cpu_to_be32(state.total_len);
1179
1180 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1181 cmd->data_out_desc_cnt = count;
8f26c9ff 1182 else
c07d424d
DD		 1183 cmd->data_in_desc_cnt = count;
1184
1185 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1186 DMA_TO_DEVICE);
8f26c9ff
DD		 1187
1188map_complete:
aef9ec39
RD		 1189 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1190 cmd->buf_fmt = fmt << 4;
1191 else
1192 cmd->buf_fmt = fmt;
1193
aef9ec39
RD		 1194 return len;
1195}
1196
76c75b25
BVA		 1197/*
1198 * Return an IU and possible credit to the free pool
1199 */
1200static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1201 enum srp_iu_type iu_type)
1202{
1203 unsigned long flags;
1204
e9684678 1205 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1206 list_add(&iu->list, &target->free_tx);
1207 if (iu_type != SRP_IU_RSP)
1208 ++target->req_lim;
e9684678 1209 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1210}
1211
05a1d750 1212/*
e9684678
BVA		 1213 * Must be called with target->lock held to protect req_lim and free_tx.
1214 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1215 *
1216 * Note:
1217 * An upper limit for the number of allocated information units for each
1218 * request type is:
1219 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1220 * more than Scsi_Host.can_queue requests.
1221 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1222 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1223 * one unanswered SRP request to an initiator.
1224 */
1225static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1226 enum srp_iu_type iu_type)
1227{
1228 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1229 struct srp_iu *iu;
1230
1231 srp_send_completion(target->send_cq, target);
1232
dcb4cb85 1233 if (list_empty(&target->free_tx))
05a1d750
DD		 1234 return NULL;
1235
1236 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1237 if (iu_type != SRP_IU_RSP) {
1238 if (target->req_lim <= rsv) {
1239 ++target->zero_req_lim;
1240 return NULL;
1241 }
1242
1243 --target->req_lim;
05a1d750
DD		 1244 }
1245
dcb4cb85 1246 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1247 list_del(&iu->list);
05a1d750
DD		 1248 return iu;
1249}
1250
76c75b25
BVA		 1251static int srp_post_send(struct srp_target_port *target,
1252 struct srp_iu *iu, int len)
05a1d750
DD		 1253{
1254 struct ib_sge list;
1255 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1256
1257 list.addr = iu->dma;
1258 list.length = len;
9af76271 1259 list.lkey = target->lkey;
05a1d750
DD		 1260
1261 wr.next = NULL;
dcb4cb85 1262 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1263 wr.sg_list = &list;
1264 wr.num_sge = 1;
1265 wr.opcode = IB_WR_SEND;
1266 wr.send_flags = IB_SEND_SIGNALED;
1267
76c75b25 1268 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1269}
1270
dcb4cb85 1271static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1272{
c996bb47 1273 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1274 struct ib_sge list;
c996bb47
BVA		 1275
1276 list.addr = iu->dma;
1277 list.length = iu->size;
9af76271 1278 list.lkey = target->lkey;
c996bb47
BVA		 1279
1280 wr.next = NULL;
dcb4cb85 1281 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1282 wr.sg_list = &list;
1283 wr.num_sge = 1;
1284
dcb4cb85 1285 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1286}
1287
aef9ec39
RD		 1288static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1289{
1290 struct srp_request *req;
1291 struct scsi_cmnd *scmnd;
1292 unsigned long flags;
aef9ec39 1293
aef9ec39 1294 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1295 spin_lock_irqsave(&target->lock, flags);
94a9174c 1296 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1297 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1298
f8b6e31e
DD		 1299 target->tsk_mgmt_status = -1;
1300 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1301 target->tsk_mgmt_status = rsp->data[3];
1302 complete(&target->tsk_mgmt_done);
aef9ec39 1303 } else {
f8b6e31e 1304 req = &target->req_ring[rsp->tag];
b3fe628d 1305 scmnd = srp_claim_req(target, req, NULL, NULL);
22032991 1306 if (!scmnd) {
7aa54bd7
DD		 1307 shost_printk(KERN_ERR, target->scsi_host,
1308 "Null scmnd for RSP w/tag %016llx\n",
1309 (unsigned long long) rsp->tag);
22032991
BVA		 1310
1311 spin_lock_irqsave(&target->lock, flags);
1312 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1313 spin_unlock_irqrestore(&target->lock, flags);
1314
1315 return;
1316 }
aef9ec39
RD		 1317 scmnd->result = rsp->status;
1318
1319 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1320 memcpy(scmnd->sense_buffer, rsp->data +
1321 be32_to_cpu(rsp->resp_data_len),
1322 min_t(int, be32_to_cpu(rsp->sense_data_len),
1323 SCSI_SENSE_BUFFERSIZE));
1324 }
1325
1326 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1327 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1328 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1329 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1330
22032991
BVA		 1331 srp_free_req(target, req, scmnd,
1332 be32_to_cpu(rsp->req_lim_delta));
1333
f8b6e31e
DD		 1334 scmnd->host_scribble = NULL;
1335 scmnd->scsi_done(scmnd);
aef9ec39 1336 }
aef9ec39
RD		 1337}
1338
bb12588a
DD		 1339static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1340 void *rsp, int len)
1341{
76c75b25 1342 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1343 unsigned long flags;
1344 struct srp_iu *iu;
76c75b25 1345 int err;
bb12588a 1346
e9684678 1347 spin_lock_irqsave(&target->lock, flags);
bb12588a 1348 target->req_lim += req_delta;
bb12588a 1349 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1350 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1351
bb12588a
DD		 1352 if (!iu) {
1353 shost_printk(KERN_ERR, target->scsi_host, PFX
1354 "no IU available to send response\n");
76c75b25 1355 return 1;
bb12588a
DD		 1356 }
1357
1358 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1359 memcpy(iu->buf, rsp, len);
1360 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1361
76c75b25
BVA		 1362 err = srp_post_send(target, iu, len);
1363 if (err) {
bb12588a
DD		 1364 shost_printk(KERN_ERR, target->scsi_host, PFX
1365 "unable to post response: %d\n", err);
76c75b25
BVA		 1366 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1367 }
bb12588a 1368
bb12588a
DD		 1369 return err;
1370}
1371
1372static void srp_process_cred_req(struct srp_target_port *target,
1373 struct srp_cred_req *req)
1374{
1375 struct srp_cred_rsp rsp = {
1376 .opcode = SRP_CRED_RSP,
1377 .tag = req->tag,
1378 };
1379 s32 delta = be32_to_cpu(req->req_lim_delta);
1380
1381 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1382 shost_printk(KERN_ERR, target->scsi_host, PFX
1383 "problems processing SRP_CRED_REQ\n");
1384}
1385
1386static void srp_process_aer_req(struct srp_target_port *target,
1387 struct srp_aer_req *req)
1388{
1389 struct srp_aer_rsp rsp = {
1390 .opcode = SRP_AER_RSP,
1391 .tag = req->tag,
1392 };
1393 s32 delta = be32_to_cpu(req->req_lim_delta);
1394
1395 shost_printk(KERN_ERR, target->scsi_host, PFX
1396 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1397
1398 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1399 shost_printk(KERN_ERR, target->scsi_host, PFX
1400 "problems processing SRP_AER_REQ\n");
1401}
1402
aef9ec39
RD		 1403static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1404{
dcb4cb85 1405 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1406 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1407 int res;
aef9ec39
RD		 1408 u8 opcode;
1409
85507bcc
RC		 1410 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1411 DMA_FROM_DEVICE);
aef9ec39
RD		 1412
1413 opcode = *(u8 *) iu->buf;
1414
1415 if (0) {
7aa54bd7
DD		 1416 shost_printk(KERN_ERR, target->scsi_host,
1417 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1418 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1419 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1420 }
1421
1422 switch (opcode) {
1423 case SRP_RSP:
1424 srp_process_rsp(target, iu->buf);
1425 break;
1426
bb12588a
DD		 1427 case SRP_CRED_REQ:
1428 srp_process_cred_req(target, iu->buf);
1429 break;
1430
1431 case SRP_AER_REQ:
1432 srp_process_aer_req(target, iu->buf);
1433 break;
1434
aef9ec39
RD		 1435 case SRP_T_LOGOUT:
1436 /* XXX Handle target logout */
7aa54bd7
DD		 1437 shost_printk(KERN_WARNING, target->scsi_host,
1438 PFX "Got target logout request\n");
aef9ec39
RD		 1439 break;
1440
1441 default:
7aa54bd7
DD		 1442 shost_printk(KERN_WARNING, target->scsi_host,
1443 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1444 break;
1445 }
1446
85507bcc
RC		 1447 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1448 DMA_FROM_DEVICE);
c996bb47 1449
dcb4cb85 1450 res = srp_post_recv(target, iu);
c996bb47
BVA		 1451 if (res != 0)
1452 shost_printk(KERN_ERR, target->scsi_host,
1453 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1454}
1455
c1120f89
BVA		 1456/**
1457 * srp_tl_err_work() - handle a transport layer error
1458 *
1459 * Note: This function may get invoked before the rport has been created,
1460 * hence the target->rport test.
1461 */
1462static void srp_tl_err_work(struct work_struct *work)
1463{
1464 struct srp_target_port *target;
1465
1466 target = container_of(work, struct srp_target_port, tl_err_work);
1467 if (target->rport)
1468 srp_start_tl_fail_timers(target->rport);
1469}
1470
cd4e3854 1471static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
948d1e88
BVA		 1472 struct srp_target_port *target)
1473{
294c875a 1474 if (target->connected && !target->qp_in_error) {
4f0af697
BVA		 1475 shost_printk(KERN_ERR, target->scsi_host,
1476 PFX "failed %s status %d\n",
cd4e3854 1477 send_err ? "send" : "receive",
4f0af697 1478 wc_status);
c1120f89 1479 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1480 }
948d1e88
BVA		 1481 target->qp_in_error = true;
1482}
1483
9c03dc9f 1484static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1485{
1486 struct srp_target_port *target = target_ptr;
1487 struct ib_wc wc;
aef9ec39
RD		 1488
1489 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1490 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1491 if (likely(wc.status == IB_WC_SUCCESS)) {
1492 srp_handle_recv(target, &wc);
1493 } else {
cd4e3854 1494 srp_handle_qp_err(wc.status, false, target);
aef9ec39 1495 }
9c03dc9f
BVA		 1496 }
1497}
1498
1499static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1500{
1501 struct srp_target_port *target = target_ptr;
1502 struct ib_wc wc;
dcb4cb85 1503 struct srp_iu *iu;
9c03dc9f
BVA		 1504
1505 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1506 if (likely(wc.status == IB_WC_SUCCESS)) {
1507 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1508 list_add(&iu->list, &target->free_tx);
1509 } else {
cd4e3854 1510 srp_handle_qp_err(wc.status, true, target);
9c03dc9f 1511 }
aef9ec39
RD		 1512 }
1513}
1514
76c75b25 1515static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1516{
76c75b25 1517 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1518 struct srp_rport *rport = target->rport;
aef9ec39
RD		 1519 struct srp_request *req;
1520 struct srp_iu *iu;
1521 struct srp_cmd *cmd;
85507bcc 1522 struct ib_device *dev;
76c75b25 1523 unsigned long flags;
ed9b2264 1524 int len, result;
a95cadb9
BVA		 1525 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1526
1527 /*
1528 * The SCSI EH thread is the only context from which srp_queuecommand()
1529 * can get invoked for blocked devices (SDEV_BLOCK /
1530 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1531 * locking the rport mutex if invoked from inside the SCSI EH.
1532 */
1533 if (in_scsi_eh)
1534 mutex_lock(&rport->mutex);
aef9ec39 1535
ed9b2264
BVA		 1536 result = srp_chkready(target->rport);
1537 if (unlikely(result)) {
1538 scmnd->result = result;
2ce19e72 1539 scmnd->scsi_done(scmnd);
a95cadb9 1540 goto unlock_rport;
2ce19e72
BVA		 1541 }
1542
e9684678 1543 spin_lock_irqsave(&target->lock, flags);
bb12588a 1544 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1545 if (!iu)
695b8349
BVA		 1546 goto err_unlock;
1547
1548 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1549 list_del(&req->list);
1550 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1551
05321937 1552 dev = target->srp_host->srp_dev->dev;
49248644 1553 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1554 DMA_TO_DEVICE);
aef9ec39 1555
aef9ec39 1556 scmnd->result = 0;
f8b6e31e 1557 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1558
1559 cmd = iu->buf;
1560 memset(cmd, 0, sizeof *cmd);
1561
1562 cmd->opcode = SRP_CMD;
1563 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1564 cmd->tag = req->index;
aef9ec39
RD		 1565 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1566
aef9ec39
RD		 1567 req->scmnd = scmnd;
1568 req->cmd = iu;
aef9ec39
RD		 1569
1570 len = srp_map_data(scmnd, target, req);
1571 if (len < 0) {
7aa54bd7
DD		 1572 shost_printk(KERN_ERR, target->scsi_host,
1573 PFX "Failed to map data\n");
76c75b25 1574 goto err_iu;
aef9ec39
RD		 1575 }
1576
49248644 1577 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1578 DMA_TO_DEVICE);
aef9ec39 1579
76c75b25 1580 if (srp_post_send(target, iu, len)) {
7aa54bd7 1581 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1582 goto err_unmap;
1583 }
1584
a95cadb9
BVA		 1585unlock_rport:
1586 if (in_scsi_eh)
1587 mutex_unlock(&rport->mutex);
1588
aef9ec39
RD		 1589 return 0;
1590
1591err_unmap:
1592 srp_unmap_data(scmnd, target, req);
1593
76c75b25
BVA		 1594err_iu:
1595 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1596
024ca901
BVA		 1597 /*
1598 * Avoid that the loops that iterate over the request ring can
1599 * encounter a dangling SCSI command pointer.
1600 */
1601 req->scmnd = NULL;
1602
e9684678 1603 spin_lock_irqsave(&target->lock, flags);
76c75b25 1604 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1605
1606err_unlock:
e9684678 1607 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1608
a95cadb9
BVA		 1609 if (in_scsi_eh)
1610 mutex_unlock(&rport->mutex);
1611
aef9ec39
RD		 1612 return SCSI_MLQUEUE_HOST_BUSY;
1613}
1614
4d73f95f
BVA		 1615/*
1616 * Note: the resources allocated in this function are freed in
1617 * srp_free_target_ib().
1618 */
aef9ec39
RD		 1619static int srp_alloc_iu_bufs(struct srp_target_port *target)
1620{
1621 int i;
1622
4d73f95f
BVA		 1623 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1624 GFP_KERNEL);
1625 if (!target->rx_ring)
1626 goto err_no_ring;
1627 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1628 GFP_KERNEL);
1629 if (!target->tx_ring)
1630 goto err_no_ring;
1631
1632 for (i = 0; i < target->queue_size; ++i) {
aef9ec39
RD		 1633 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1634 target->max_ti_iu_len,
1635 GFP_KERNEL, DMA_FROM_DEVICE);
1636 if (!target->rx_ring[i])
1637 goto err;
1638 }
1639
4d73f95f 1640 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1641 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1642 target->max_iu_len,
aef9ec39
RD		 1643 GFP_KERNEL, DMA_TO_DEVICE);
1644 if (!target->tx_ring[i])
1645 goto err;
dcb4cb85
BVA		 1646
1647 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1648 }
1649
1650 return 0;
1651
1652err:
4d73f95f 1653 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1654 srp_free_iu(target->srp_host, target->rx_ring[i]);
aef9ec39 1655 srp_free_iu(target->srp_host, target->tx_ring[i]);
aef9ec39
RD		 1656 }
1657
4d73f95f
BVA		 1658
1659err_no_ring:
1660 kfree(target->tx_ring);
1661 target->tx_ring = NULL;
1662 kfree(target->rx_ring);
1663 target->rx_ring = NULL;
1664
aef9ec39
RD		 1665 return -ENOMEM;
1666}
1667
c9b03c1a
BVA		 1668static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1669{
1670 uint64_t T_tr_ns, max_compl_time_ms;
1671 uint32_t rq_tmo_jiffies;
1672
1673 /*
1674 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1675 * table 91), both the QP timeout and the retry count have to be set
1676 * for RC QP's during the RTR to RTS transition.
1677 */
1678 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1679 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1680
1681 /*
1682 * Set target->rq_tmo_jiffies to one second more than the largest time
1683 * it can take before an error completion is generated. See also
1684 * C9-140..142 in the IBTA spec for more information about how to
1685 * convert the QP Local ACK Timeout value to nanoseconds.
1686 */
1687 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1688 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1689 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1690 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1691
1692 return rq_tmo_jiffies;
1693}
1694
961e0be8
DD		 1695static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1696 struct srp_login_rsp *lrsp,
1697 struct srp_target_port *target)
1698{
1699 struct ib_qp_attr *qp_attr = NULL;
1700 int attr_mask = 0;
1701 int ret;
1702 int i;
1703
1704 if (lrsp->opcode == SRP_LOGIN_RSP) {
1705 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1706 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1707
1708 /*
1709 * Reserve credits for task management so we don't
1710 * bounce requests back to the SCSI mid-layer.
1711 */
1712 target->scsi_host->can_queue
1713 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1714 target->scsi_host->can_queue);
4d73f95f
BVA		 1715 target->scsi_host->cmd_per_lun
1716 = min_t(int, target->scsi_host->can_queue,
1717 target->scsi_host->cmd_per_lun);
961e0be8
DD		 1718 } else {
1719 shost_printk(KERN_WARNING, target->scsi_host,
1720 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1721 ret = -ECONNRESET;
1722 goto error;
1723 }
1724
4d73f95f 1725 if (!target->rx_ring) {
961e0be8
DD		 1726 ret = srp_alloc_iu_bufs(target);
1727 if (ret)
1728 goto error;
1729 }
1730
1731 ret = -ENOMEM;
1732 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1733 if (!qp_attr)
1734 goto error;
1735
1736 qp_attr->qp_state = IB_QPS_RTR;
1737 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1738 if (ret)
1739 goto error_free;
1740
1741 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1742 if (ret)
1743 goto error_free;
1744
4d73f95f 1745 for (i = 0; i < target->queue_size; i++) {
961e0be8
DD		 1746 struct srp_iu *iu = target->rx_ring[i];
1747 ret = srp_post_recv(target, iu);
1748 if (ret)
1749 goto error_free;
1750 }
1751
1752 qp_attr->qp_state = IB_QPS_RTS;
1753 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1754 if (ret)
1755 goto error_free;
1756
c9b03c1a
BVA		 1757 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1758
961e0be8
DD		 1759 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1760 if (ret)
1761 goto error_free;
1762
1763 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1764
1765error_free:
1766 kfree(qp_attr);
1767
1768error:
1769 target->status = ret;
1770}
1771
aef9ec39
RD		 1772static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1773 struct ib_cm_event *event,
1774 struct srp_target_port *target)
1775{
7aa54bd7 1776 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1777 struct ib_class_port_info *cpi;
1778 int opcode;
1779
1780 switch (event->param.rej_rcvd.reason) {
1781 case IB_CM_REJ_PORT_CM_REDIRECT:
1782 cpi = event->param.rej_rcvd.ari;
1783 target->path.dlid = cpi->redirect_lid;
1784 target->path.pkey = cpi->redirect_pkey;
1785 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1786 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1787
1788 target->status = target->path.dlid ?
1789 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1790 break;
1791
1792 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1793 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1794 /*
1795 * Topspin/Cisco SRP gateways incorrectly send
1796 * reject reason code 25 when they mean 24
1797 * (port redirect).
1798 */
1799 memcpy(target->path.dgid.raw,
1800 event->param.rej_rcvd.ari, 16);
1801
7aa54bd7
DD		 1802 shost_printk(KERN_DEBUG, shost,
1803 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1804 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1805 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1806
1807 target->status = SRP_PORT_REDIRECT;
1808 } else {
7aa54bd7
DD		 1809 shost_printk(KERN_WARNING, shost,
1810 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1811 target->status = -ECONNRESET;
1812 }
1813 break;
1814
1815 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1816 shost_printk(KERN_WARNING, shost,
1817 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1818 target->status = -ECONNRESET;
1819 break;
1820
1821 case IB_CM_REJ_CONSUMER_DEFINED:
1822 opcode = *(u8 *) event->private_data;
1823 if (opcode == SRP_LOGIN_REJ) {
1824 struct srp_login_rej *rej = event->private_data;
1825 u32 reason = be32_to_cpu(rej->reason);
1826
1827 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1828 shost_printk(KERN_WARNING, shost,
1829 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1830 else
e7ffde01
BVA		 1831 shost_printk(KERN_WARNING, shost, PFX
1832 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
1833 target->path.sgid.raw,
1834 target->orig_dgid, reason);
aef9ec39 1835 } else
7aa54bd7
DD		 1836 shost_printk(KERN_WARNING, shost,
1837 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1838 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1839 target->status = -ECONNRESET;
1840 break;
1841
9fe4bcf4
DD		 1842 case IB_CM_REJ_STALE_CONN:
1843 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1844 target->status = SRP_STALE_CONN;
1845 break;
1846
aef9ec39 1847 default:
7aa54bd7
DD		 1848 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1849 event->param.rej_rcvd.reason);
aef9ec39
RD		 1850 target->status = -ECONNRESET;
1851 }
1852}
1853
1854static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1855{
1856 struct srp_target_port *target = cm_id->context;
aef9ec39 1857 int comp = 0;
aef9ec39
RD		 1858
1859 switch (event->event) {
1860 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1861 shost_printk(KERN_DEBUG, target->scsi_host,
1862 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1863 comp = 1;
1864 target->status = -ECONNRESET;
1865 break;
1866
1867 case IB_CM_REP_RECEIVED:
1868 comp = 1;
961e0be8 1869 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 1870 break;
1871
1872 case IB_CM_REJ_RECEIVED:
7aa54bd7 1873 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1874 comp = 1;
1875
1876 srp_cm_rej_handler(cm_id, event, target);
1877 break;
1878
b7ac4ab4 1879 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1880 shost_printk(KERN_WARNING, target->scsi_host,
1881 PFX "DREQ received - connection closed\n");
294c875a 1882 srp_change_conn_state(target, false);
b7ac4ab4 1883 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1884 shost_printk(KERN_ERR, target->scsi_host,
1885 PFX "Sending CM DREP failed\n");
c1120f89 1886 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 1887 break;
1888
1889 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1890 shost_printk(KERN_ERR, target->scsi_host,
1891 PFX "connection closed\n");
ac72d766 1892 comp = 1;
aef9ec39 1893
aef9ec39
RD		 1894 target->status = 0;
1895 break;
1896
b7ac4ab4
IR		 1897 case IB_CM_MRA_RECEIVED:
1898 case IB_CM_DREQ_ERROR:
1899 case IB_CM_DREP_RECEIVED:
1900 break;
1901
aef9ec39 1902 default:
7aa54bd7
DD		 1903 shost_printk(KERN_WARNING, target->scsi_host,
1904 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1905 break;
1906 }
1907
1908 if (comp)
1909 complete(&target->done);
1910
aef9ec39
RD		 1911 return 0;
1912}
1913
71444b97
JW		 1914/**
1915 * srp_change_queue_type - changing device queue tag type
1916 * @sdev: scsi device struct
1917 * @tag_type: requested tag type
1918 *
1919 * Returns queue tag type.
1920 */
1921static int
1922srp_change_queue_type(struct scsi_device *sdev, int tag_type)
1923{
1924 if (sdev->tagged_supported) {
1925 scsi_set_tag_type(sdev, tag_type);
1926 if (tag_type)
1927 scsi_activate_tcq(sdev, sdev->queue_depth);
1928 else
1929 scsi_deactivate_tcq(sdev, sdev->queue_depth);
1930 } else
1931 tag_type = 0;
1932
1933 return tag_type;
1934}
1935
1936/**
1937 * srp_change_queue_depth - setting device queue depth
1938 * @sdev: scsi device struct
1939 * @qdepth: requested queue depth
1940 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
1941 * (see include/scsi/scsi_host.h for definition)
1942 *
1943 * Returns queue depth.
1944 */
1945static int
1946srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
1947{
1948 struct Scsi_Host *shost = sdev->host;
1949 int max_depth;
1950 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
1951 max_depth = shost->can_queue;
1952 if (!sdev->tagged_supported)
1953 max_depth = 1;
1954 if (qdepth > max_depth)
1955 qdepth = max_depth;
1956 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
1957 } else if (reason == SCSI_QDEPTH_QFULL)
1958 scsi_track_queue_full(sdev, qdepth);
1959 else
1960 return -EOPNOTSUPP;
1961
1962 return sdev->queue_depth;
1963}
1964
d945e1df 1965static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 1966 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 1967{
a95cadb9 1968 struct srp_rport *rport = target->rport;
19081f31 1969 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 1970 struct srp_iu *iu;
1971 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 1972
3780d1f0
BVA		 1973 if (!target->connected || target->qp_in_error)
1974 return -1;
1975
f8b6e31e 1976 init_completion(&target->tsk_mgmt_done);
aef9ec39 1977
a95cadb9
BVA		 1978 /*
1979 * Lock the rport mutex to avoid that srp_create_target_ib() is
1980 * invoked while a task management function is being sent.
1981 */
1982 mutex_lock(&rport->mutex);
e9684678 1983 spin_lock_irq(&target->lock);
bb12588a 1984 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 1985 spin_unlock_irq(&target->lock);
76c75b25 1986
a95cadb9
BVA		 1987 if (!iu) {
1988 mutex_unlock(&rport->mutex);
1989
76c75b25 1990 return -1;
a95cadb9 1991 }
aef9ec39 1992
19081f31
DD		 1993 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1994 DMA_TO_DEVICE);
aef9ec39
RD		 1995 tsk_mgmt = iu->buf;
1996 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1997
1998 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 1999 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
2000 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 2001 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 2002 tsk_mgmt->task_tag = req_tag;
aef9ec39 2003
19081f31
DD		 2004 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2005 DMA_TO_DEVICE);
76c75b25
BVA		 2006 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
2007 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 2008 mutex_unlock(&rport->mutex);
2009
76c75b25
BVA		 2010 return -1;
2011 }
a95cadb9 2012 mutex_unlock(&rport->mutex);
d945e1df 2013
f8b6e31e 2014 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 2015 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 2016 return -1;
aef9ec39 2017
d945e1df 2018 return 0;
d945e1df
RD		 2019}
2020
aef9ec39
RD		 2021static int srp_abort(struct scsi_cmnd *scmnd)
2022{
d945e1df 2023 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 2024 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
086f44f5 2025 int ret;
d945e1df 2026
7aa54bd7 2027 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 2028
b3fe628d 2029 if (!req || !srp_claim_req(target, req, NULL, scmnd))
99b6697a 2030 return SUCCESS;
086f44f5 2031 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
80d5e8a2 2032 SRP_TSK_ABORT_TASK) == 0)
086f44f5 2033 ret = SUCCESS;
ed9b2264 2034 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 2035 ret = FAST_IO_FAIL;
086f44f5
BVA		 2036 else
2037 ret = FAILED;
22032991
BVA		 2038 srp_free_req(target, req, scmnd, 0);
2039 scmnd->result = DID_ABORT << 16;
d8536670 2040 scmnd->scsi_done(scmnd);
d945e1df 2041
086f44f5 2042 return ret;
aef9ec39
RD		 2043}
2044
2045static int srp_reset_device(struct scsi_cmnd *scmnd)
2046{
d945e1df 2047 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 2048 int i;
d945e1df 2049
7aa54bd7 2050 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 2051
f8b6e31e
DD		 2052 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2053 SRP_TSK_LUN_RESET))
d945e1df 2054 return FAILED;
f8b6e31e 2055 if (target->tsk_mgmt_status)
d945e1df
RD		 2056 return FAILED;
2057
4d73f95f 2058 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 2059 struct srp_request *req = &target->req_ring[i];
b3fe628d 2060 srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
536ae14e 2061 }
d945e1df 2062
d945e1df 2063 return SUCCESS;
aef9ec39
RD		 2064}
2065
2066static int srp_reset_host(struct scsi_cmnd *scmnd)
2067{
2068 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 2069
7aa54bd7 2070 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 2071
ed9b2264 2072 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 2073}
2074
c9b03c1a
BVA		 2075static int srp_slave_configure(struct scsi_device *sdev)
2076{
2077 struct Scsi_Host *shost = sdev->host;
2078 struct srp_target_port *target = host_to_target(shost);
2079 struct request_queue *q = sdev->request_queue;
2080 unsigned long timeout;
2081
2082 if (sdev->type == TYPE_DISK) {
2083 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2084 blk_queue_rq_timeout(q, timeout);
2085 }
2086
2087 return 0;
2088}
2089
ee959b00
TJ		 2090static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2091 char *buf)
6ecb0c84 2092{
ee959b00 2093 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2094
6ecb0c84
RD		 2095 return sprintf(buf, "0x%016llx\n",
2096 (unsigned long long) be64_to_cpu(target->id_ext));
2097}
2098
ee959b00
TJ		 2099static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2100 char *buf)
6ecb0c84 2101{
ee959b00 2102 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2103
6ecb0c84
RD		 2104 return sprintf(buf, "0x%016llx\n",
2105 (unsigned long long) be64_to_cpu(target->ioc_guid));
2106}
2107
ee959b00
TJ		 2108static ssize_t show_service_id(struct device *dev,
2109 struct device_attribute *attr, char *buf)
6ecb0c84 2110{
ee959b00 2111 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2112
6ecb0c84
RD		 2113 return sprintf(buf, "0x%016llx\n",
2114 (unsigned long long) be64_to_cpu(target->service_id));
2115}
2116
ee959b00
TJ		 2117static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2118 char *buf)
6ecb0c84 2119{
ee959b00 2120 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2121
6ecb0c84
RD		 2122 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2123}
2124
848b3082
BVA		 2125static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2126 char *buf)
2127{
2128 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2129
2130 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2131}
2132
ee959b00
TJ		 2133static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2134 char *buf)
6ecb0c84 2135{
ee959b00 2136 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2137
5b095d98 2138 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 2139}
2140
ee959b00
TJ		 2141static ssize_t show_orig_dgid(struct device *dev,
2142 struct device_attribute *attr, char *buf)
3633b3d0 2143{
ee959b00 2144 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 2145
5b095d98 2146 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 2147}
2148
89de7486
BVA		 2149static ssize_t show_req_lim(struct device *dev,
2150 struct device_attribute *attr, char *buf)
2151{
2152 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2153
89de7486
BVA		 2154 return sprintf(buf, "%d\n", target->req_lim);
2155}
2156
ee959b00
TJ		 2157static ssize_t show_zero_req_lim(struct device *dev,
2158 struct device_attribute *attr, char *buf)
6bfa24fa 2159{
ee959b00 2160 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 2161
6bfa24fa
RD		 2162 return sprintf(buf, "%d\n", target->zero_req_lim);
2163}
2164
ee959b00
TJ		 2165static ssize_t show_local_ib_port(struct device *dev,
2166 struct device_attribute *attr, char *buf)
ded7f1a1 2167{
ee959b00 2168 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2169
2170 return sprintf(buf, "%d\n", target->srp_host->port);
2171}
2172
ee959b00
TJ		 2173static ssize_t show_local_ib_device(struct device *dev,
2174 struct device_attribute *attr, char *buf)
ded7f1a1 2175{
ee959b00 2176 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2177
05321937 2178 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2179}
2180
4b5e5f41
BVA		 2181static ssize_t show_comp_vector(struct device *dev,
2182 struct device_attribute *attr, char *buf)
2183{
2184 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2185
2186 return sprintf(buf, "%d\n", target->comp_vector);
2187}
2188
7bb312e4
VP		 2189static ssize_t show_tl_retry_count(struct device *dev,
2190 struct device_attribute *attr, char *buf)
2191{
2192 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2193
2194 return sprintf(buf, "%d\n", target->tl_retry_count);
2195}
2196
49248644
DD		 2197static ssize_t show_cmd_sg_entries(struct device *dev,
2198 struct device_attribute *attr, char *buf)
2199{
2200 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2201
2202 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2203}
2204
c07d424d
DD		 2205static ssize_t show_allow_ext_sg(struct device *dev,
2206 struct device_attribute *attr, char *buf)
2207{
2208 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2209
2210 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2211}
2212
ee959b00
TJ		 2213static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2214static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2215static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2216static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
848b3082 2217static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
ee959b00
TJ		 2218static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2219static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2220static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2221static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2222static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2223static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2224static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2225static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2226static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2227static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2228
2229static struct device_attribute *srp_host_attrs[] = {
2230 &dev_attr_id_ext,
2231 &dev_attr_ioc_guid,
2232 &dev_attr_service_id,
2233 &dev_attr_pkey,
848b3082 2234 &dev_attr_sgid,
ee959b00
TJ		 2235 &dev_attr_dgid,
2236 &dev_attr_orig_dgid,
89de7486 2237 &dev_attr_req_lim,
ee959b00
TJ		 2238 &dev_attr_zero_req_lim,
2239 &dev_attr_local_ib_port,
2240 &dev_attr_local_ib_device,
4b5e5f41 2241 &dev_attr_comp_vector,
7bb312e4 2242 &dev_attr_tl_retry_count,
49248644 2243 &dev_attr_cmd_sg_entries,
c07d424d 2244 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2245 NULL
2246};
2247
aef9ec39
RD		 2248static struct scsi_host_template srp_template = {
2249 .module = THIS_MODULE,
b7f008fd
RD		 2250 .name = "InfiniBand SRP initiator",
2251 .proc_name = DRV_NAME,
c9b03c1a 2252 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2253 .info = srp_target_info,
2254 .queuecommand = srp_queuecommand,
71444b97
JW		 2255 .change_queue_depth = srp_change_queue_depth,
2256 .change_queue_type = srp_change_queue_type,
aef9ec39
RD		 2257 .eh_abort_handler = srp_abort,
2258 .eh_device_reset_handler = srp_reset_device,
2259 .eh_host_reset_handler = srp_reset_host,
2742c1da 2260 .skip_settle_delay = true,
49248644 2261 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
4d73f95f 2262 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
aef9ec39 2263 .this_id = -1,
4d73f95f 2264 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
6ecb0c84
RD		 2265 .use_clustering = ENABLE_CLUSTERING,
2266 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2267};
2268
2269static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2270{
3236822b
FT		 2271 struct srp_rport_identifiers ids;
2272 struct srp_rport *rport;
2273
aef9ec39
RD		 2274 sprintf(target->target_name, "SRP.T10:%016llX",
2275 (unsigned long long) be64_to_cpu(target->id_ext));
2276
05321937 2277 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2278 return -ENODEV;
2279
3236822b
FT		 2280 memcpy(ids.port_id, &target->id_ext, 8);
2281 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2282 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2283 rport = srp_rport_add(target->scsi_host, &ids);
2284 if (IS_ERR(rport)) {
2285 scsi_remove_host(target->scsi_host);
2286 return PTR_ERR(rport);
2287 }
2288
dc1bdbd9 2289 rport->lld_data = target;
9dd69a60 2290 target->rport = rport;
dc1bdbd9 2291
b3589fd4 2292 spin_lock(&host->target_lock);
aef9ec39 2293 list_add_tail(&target->list, &host->target_list);
b3589fd4 2294 spin_unlock(&host->target_lock);
aef9ec39
RD		 2295
2296 target->state = SRP_TARGET_LIVE;
2297
aef9ec39 2298 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2299 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 2300
2301 return 0;
2302}
2303
ee959b00 2304static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2305{
2306 struct srp_host *host =
ee959b00 2307 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2308
2309 complete(&host->released);
2310}
2311
2312static struct class srp_class = {
2313 .name = "infiniband_srp",
ee959b00 2314 .dev_release = srp_release_dev
aef9ec39
RD		 2315};
2316
96fc248a
BVA		 2317/**
2318 * srp_conn_unique() - check whether the connection to a target is unique
2319 */
2320static bool srp_conn_unique(struct srp_host *host,
2321 struct srp_target_port *target)
2322{
2323 struct srp_target_port *t;
2324 bool ret = false;
2325
2326 if (target->state == SRP_TARGET_REMOVED)
2327 goto out;
2328
2329 ret = true;
2330
2331 spin_lock(&host->target_lock);
2332 list_for_each_entry(t, &host->target_list, list) {
2333 if (t != target &&
2334 target->id_ext == t->id_ext &&
2335 target->ioc_guid == t->ioc_guid &&
2336 target->initiator_ext == t->initiator_ext) {
2337 ret = false;
2338 break;
2339 }
2340 }
2341 spin_unlock(&host->target_lock);
2342
2343out:
2344 return ret;
2345}
2346
aef9ec39
RD		 2347/*
2348 * Target ports are added by writing
2349 *
2350 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2351 * pkey=<P_Key>,service_id=<service ID>
2352 *
2353 * to the add_target sysfs attribute.
2354 */
2355enum {
2356 SRP_OPT_ERR = 0,
2357 SRP_OPT_ID_EXT = 1 << 0,
2358 SRP_OPT_IOC_GUID = 1 << 1,
2359 SRP_OPT_DGID = 1 << 2,
2360 SRP_OPT_PKEY = 1 << 3,
2361 SRP_OPT_SERVICE_ID = 1 << 4,
2362 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2363 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2364 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2365 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2366 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2367 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2368 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2369 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2370 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
4d73f95f 2371 SRP_OPT_QUEUE_SIZE = 1 << 14,
aef9ec39
RD		 2372 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2373 SRP_OPT_IOC_GUID |
2374 SRP_OPT_DGID |
2375 SRP_OPT_PKEY |
2376 SRP_OPT_SERVICE_ID),
2377};
2378
a447c093 2379static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2380 { SRP_OPT_ID_EXT, "id_ext=%s" },
2381 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2382 { SRP_OPT_DGID, "dgid=%s" },
2383 { SRP_OPT_PKEY, "pkey=%x" },
2384 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2385 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2386 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2387 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2388 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2389 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2390 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2391 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2392 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2393 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
4d73f95f 2394 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
52fb2b50 2395 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2396};
2397
2398static int srp_parse_options(const char *buf, struct srp_target_port *target)
2399{
2400 char *options, *sep_opt;
2401 char *p;
2402 char dgid[3];
2403 substring_t args[MAX_OPT_ARGS];
2404 int opt_mask = 0;
2405 int token;
2406 int ret = -EINVAL;
2407 int i;
2408
2409 options = kstrdup(buf, GFP_KERNEL);
2410 if (!options)
2411 return -ENOMEM;
2412
2413 sep_opt = options;
2414 while ((p = strsep(&sep_opt, ",")) != NULL) {
2415 if (!*p)
2416 continue;
2417
2418 token = match_token(p, srp_opt_tokens, args);
2419 opt_mask |= token;
2420
2421 switch (token) {
2422 case SRP_OPT_ID_EXT:
2423 p = match_strdup(args);
a20f3a6d
IR		 2424 if (!p) {
2425 ret = -ENOMEM;
2426 goto out;
2427 }
aef9ec39
RD		 2428 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2429 kfree(p);
2430 break;
2431
2432 case SRP_OPT_IOC_GUID:
2433 p = match_strdup(args);
a20f3a6d
IR		 2434 if (!p) {
2435 ret = -ENOMEM;
2436 goto out;
2437 }
aef9ec39
RD		 2438 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2439 kfree(p);
2440 break;
2441
2442 case SRP_OPT_DGID:
2443 p = match_strdup(args);
a20f3a6d
IR		 2444 if (!p) {
2445 ret = -ENOMEM;
2446 goto out;
2447 }
aef9ec39 2448 if (strlen(p) != 32) {
e0bda7d8 2449 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2450 kfree(p);
aef9ec39
RD		 2451 goto out;
2452 }
2453
2454 for (i = 0; i < 16; ++i) {
2455 strlcpy(dgid, p + i * 2, 3);
2456 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2457 }
bf17c1c7 2458 kfree(p);
3633b3d0 2459 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2460 break;
2461
2462 case SRP_OPT_PKEY:
2463 if (match_hex(args, &token)) {
e0bda7d8 2464 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2465 goto out;
2466 }
2467 target->path.pkey = cpu_to_be16(token);
2468 break;
2469
2470 case SRP_OPT_SERVICE_ID:
2471 p = match_strdup(args);
a20f3a6d
IR		 2472 if (!p) {
2473 ret = -ENOMEM;
2474 goto out;
2475 }
aef9ec39 2476 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2477 target->path.service_id = target->service_id;
aef9ec39
RD		 2478 kfree(p);
2479 break;
2480
2481 case SRP_OPT_MAX_SECT:
2482 if (match_int(args, &token)) {
e0bda7d8 2483 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2484 goto out;
2485 }
2486 target->scsi_host->max_sectors = token;
2487 break;
2488
4d73f95f
BVA		 2489 case SRP_OPT_QUEUE_SIZE:
2490 if (match_int(args, &token) || token < 1) {
2491 pr_warn("bad queue_size parameter '%s'\n", p);
2492 goto out;
2493 }
2494 target->scsi_host->can_queue = token;
2495 target->queue_size = token + SRP_RSP_SQ_SIZE +
2496 SRP_TSK_MGMT_SQ_SIZE;
2497 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2498 target->scsi_host->cmd_per_lun = token;
2499 break;
2500
52fb2b50 2501 case SRP_OPT_MAX_CMD_PER_LUN:
4d73f95f 2502 if (match_int(args, &token) || token < 1) {
e0bda7d8
BVA		 2503 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2504 p);
52fb2b50
VP		 2505 goto out;
2506 }
4d73f95f 2507 target->scsi_host->cmd_per_lun = token;
52fb2b50
VP		 2508 break;
2509
0c0450db
R		 2510 case SRP_OPT_IO_CLASS:
2511 if (match_hex(args, &token)) {
e0bda7d8 2512 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2513 goto out;
2514 }
2515 if (token != SRP_REV10_IB_IO_CLASS &&
2516 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2517 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2518 token, SRP_REV10_IB_IO_CLASS,
2519 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2520 goto out;
2521 }
2522 target->io_class = token;
2523 break;
2524
01cb9bcb
IR		 2525 case SRP_OPT_INITIATOR_EXT:
2526 p = match_strdup(args);
a20f3a6d
IR		 2527 if (!p) {
2528 ret = -ENOMEM;
2529 goto out;
2530 }
01cb9bcb
IR		 2531 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2532 kfree(p);
2533 break;
2534
49248644
DD		 2535 case SRP_OPT_CMD_SG_ENTRIES:
2536 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2537 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2538 p);
49248644
DD		 2539 goto out;
2540 }
2541 target->cmd_sg_cnt = token;
2542 break;
2543
c07d424d
DD		 2544 case SRP_OPT_ALLOW_EXT_SG:
2545 if (match_int(args, &token)) {
e0bda7d8 2546 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2547 goto out;
2548 }
2549 target->allow_ext_sg = !!token;
2550 break;
2551
2552 case SRP_OPT_SG_TABLESIZE:
2553 if (match_int(args, &token) || token < 1 ||
2554 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2555 pr_warn("bad max sg_tablesize parameter '%s'\n",
2556 p);
c07d424d
DD		 2557 goto out;
2558 }
2559 target->sg_tablesize = token;
2560 break;
2561
4b5e5f41
BVA		 2562 case SRP_OPT_COMP_VECTOR:
2563 if (match_int(args, &token) || token < 0) {
2564 pr_warn("bad comp_vector parameter '%s'\n", p);
2565 goto out;
2566 }
2567 target->comp_vector = token;
2568 break;
2569
7bb312e4
VP		 2570 case SRP_OPT_TL_RETRY_COUNT:
2571 if (match_int(args, &token) || token < 2 || token > 7) {
2572 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2573 p);
2574 goto out;
2575 }
2576 target->tl_retry_count = token;
2577 break;
2578
aef9ec39 2579 default:
e0bda7d8
BVA		 2580 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2581 p);
aef9ec39
RD		 2582 goto out;
2583 }
2584 }
2585
2586 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2587 ret = 0;
2588 else
2589 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2590 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2591 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2592 pr_warn("target creation request is missing parameter '%s'\n",
2593 srp_opt_tokens[i].pattern);
aef9ec39 2594
4d73f95f
BVA		 2595 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2596 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2597 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2598 target->scsi_host->cmd_per_lun,
2599 target->scsi_host->can_queue);
2600
aef9ec39
RD		 2601out:
2602 kfree(options);
2603 return ret;
2604}
2605
ee959b00
TJ		 2606static ssize_t srp_create_target(struct device *dev,
2607 struct device_attribute *attr,
aef9ec39
RD		 2608 const char *buf, size_t count)
2609{
2610 struct srp_host *host =
ee959b00 2611 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2612 struct Scsi_Host *target_host;
2613 struct srp_target_port *target;
c07d424d 2614 struct ib_device *ibdev = host->srp_dev->dev;
b81d00bd 2615 int ret;
aef9ec39
RD		 2616
2617 target_host = scsi_host_alloc(&srp_template,
2618 sizeof (struct srp_target_port));
2619 if (!target_host)
2620 return -ENOMEM;
2621
49248644 2622 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2623 target_host->max_channel = 0;
2624 target_host->max_id = 1;
3c8edf0e
AR		 2625 target_host->max_lun = SRP_MAX_LUN;
2626 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2627
aef9ec39 2628 target = host_to_target(target_host);
aef9ec39 2629
49248644
DD		 2630 target->io_class = SRP_REV16A_IB_IO_CLASS;
2631 target->scsi_host = target_host;
2632 target->srp_host = host;
2633 target->lkey = host->srp_dev->mr->lkey;
2634 target->rkey = host->srp_dev->mr->rkey;
2635 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2636 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2637 target->allow_ext_sg = allow_ext_sg;
7bb312e4 2638 target->tl_retry_count = 7;
4d73f95f 2639 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
aef9ec39 2640
2d7091bc
BVA		 2641 mutex_lock(&host->add_target_mutex);
2642
aef9ec39
RD		 2643 ret = srp_parse_options(buf, target);
2644 if (ret)
2645 goto err;
2646
4d73f95f
BVA		 2647 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2648
96fc248a
BVA		 2649 if (!srp_conn_unique(target->srp_host, target)) {
2650 shost_printk(KERN_INFO, target->scsi_host,
2651 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2652 be64_to_cpu(target->id_ext),
2653 be64_to_cpu(target->ioc_guid),
2654 be64_to_cpu(target->initiator_ext));
2655 ret = -EEXIST;
2656 goto err;
2657 }
2658
c07d424d
DD		 2659 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2660 target->cmd_sg_cnt < target->sg_tablesize) {
e0bda7d8 2661 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 2662 target->sg_tablesize = target->cmd_sg_cnt;
2663 }
2664
2665 target_host->sg_tablesize = target->sg_tablesize;
2666 target->indirect_size = target->sg_tablesize *
2667 sizeof (struct srp_direct_buf);
49248644
DD		 2668 target->max_iu_len = sizeof (struct srp_cmd) +
2669 sizeof (struct srp_indirect_buf) +
2670 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2671
c1120f89 2672 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 2673 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 2674 spin_lock_init(&target->lock);
2675 INIT_LIST_HEAD(&target->free_tx);
b81d00bd
BVA		 2676 ret = srp_alloc_req_data(target);
2677 if (ret)
2678 goto err_free_mem;
8f26c9ff 2679
2088ca66
SG		 2680 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2681 if (ret)
2682 goto err_free_mem;
aef9ec39 2683
aef9ec39
RD		 2684 ret = srp_create_target_ib(target);
2685 if (ret)
8f26c9ff 2686 goto err_free_mem;
aef9ec39 2687
9fe4bcf4
DD		 2688 ret = srp_new_cm_id(target);
2689 if (ret)
8f26c9ff 2690 goto err_free_ib;
aef9ec39
RD		 2691
2692 ret = srp_connect_target(target);
2693 if (ret) {
7aa54bd7
DD		 2694 shost_printk(KERN_ERR, target->scsi_host,
2695 PFX "Connection failed\n");
aef9ec39
RD		 2696 goto err_cm_id;
2697 }
2698
2699 ret = srp_add_target(host, target);
2700 if (ret)
2701 goto err_disconnect;
2702
e7ffde01
BVA		 2703 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2704 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
2705 be64_to_cpu(target->id_ext),
2706 be64_to_cpu(target->ioc_guid),
2707 be16_to_cpu(target->path.pkey),
2708 be64_to_cpu(target->service_id),
2709 target->path.sgid.raw, target->path.dgid.raw);
2710
2d7091bc
BVA		 2711 ret = count;
2712
2713out:
2714 mutex_unlock(&host->add_target_mutex);
2715 return ret;
aef9ec39
RD		 2716
2717err_disconnect:
2718 srp_disconnect_target(target);
2719
2720err_cm_id:
2721 ib_destroy_cm_id(target->cm_id);
2722
8f26c9ff 2723err_free_ib:
aef9ec39
RD		 2724 srp_free_target_ib(target);
2725
8f26c9ff
DD		 2726err_free_mem:
2727 srp_free_req_data(target);
2728
aef9ec39
RD		 2729err:
2730 scsi_host_put(target_host);
2d7091bc 2731 goto out;
aef9ec39
RD		 2732}
2733
ee959b00 2734static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2735
ee959b00
TJ		 2736static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2737 char *buf)
aef9ec39 2738{
ee959b00 2739 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2740
05321937 2741 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2742}
2743
ee959b00 2744static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2745
ee959b00
TJ		 2746static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2747 char *buf)
aef9ec39 2748{
ee959b00 2749 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2750
2751 return sprintf(buf, "%d\n", host->port);
2752}
2753
ee959b00 2754static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2755
f5358a17 2756static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2757{
2758 struct srp_host *host;
2759
2760 host = kzalloc(sizeof *host, GFP_KERNEL);
2761 if (!host)
2762 return NULL;
2763
2764 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2765 spin_lock_init(&host->target_lock);
aef9ec39 2766 init_completion(&host->released);
2d7091bc 2767 mutex_init(&host->add_target_mutex);
05321937 2768 host->srp_dev = device;
aef9ec39
RD		 2769 host->port = port;
2770
ee959b00
TJ		 2771 host->dev.class = &srp_class;
2772 host->dev.parent = device->dev->dma_device;
d927e38c 2773 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2774
ee959b00 2775 if (device_register(&host->dev))
f5358a17 2776 goto free_host;
ee959b00 2777 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2778 goto err_class;
ee959b00 2779 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2780 goto err_class;
ee959b00 2781 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2782 goto err_class;
2783
2784 return host;
2785
2786err_class:
ee959b00 2787 device_unregister(&host->dev);
aef9ec39 2788
f5358a17 2789free_host:
aef9ec39
RD		 2790 kfree(host);
2791
2792 return NULL;
2793}
2794
2795static void srp_add_one(struct ib_device *device)
2796{
f5358a17
RD		 2797 struct srp_device *srp_dev;
2798 struct ib_device_attr *dev_attr;
2799 struct ib_fmr_pool_param fmr_param;
aef9ec39 2800 struct srp_host *host;
be8b9814 2801 int max_pages_per_fmr, fmr_page_shift, s, e, p;
aef9ec39 2802
f5358a17
RD		 2803 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2804 if (!dev_attr)
cf311cd4 2805 return;
aef9ec39 2806
f5358a17 2807 if (ib_query_device(device, dev_attr)) {
e0bda7d8 2808 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 2809 goto free_attr;
2810 }
2811
2812 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2813 if (!srp_dev)
2814 goto free_attr;
2815
2816 /*
2817 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 2818 * minimum of 4096 bytes. We're unlikely to build large sglists
2819 * out of smaller entries.
f5358a17 2820 */
8f26c9ff
DD		 2821 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2822 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2823 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2824 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
f5358a17
RD		 2825
2826 INIT_LIST_HEAD(&srp_dev->dev_list);
2827
2828 srp_dev->dev = device;
2829 srp_dev->pd = ib_alloc_pd(device);
2830 if (IS_ERR(srp_dev->pd))
2831 goto free_dev;
2832
2833 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2834 IB_ACCESS_LOCAL_WRITE |
2835 IB_ACCESS_REMOTE_READ |
2836 IB_ACCESS_REMOTE_WRITE);
2837 if (IS_ERR(srp_dev->mr))
2838 goto err_pd;
2839
be8b9814
DD		 2840 for (max_pages_per_fmr = SRP_FMR_SIZE;
2841 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2842 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2843 memset(&fmr_param, 0, sizeof fmr_param);
2844 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2845 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2846 fmr_param.cache = 1;
2847 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2848 fmr_param.page_shift = fmr_page_shift;
2849 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2850 IB_ACCESS_REMOTE_WRITE |
2851 IB_ACCESS_REMOTE_READ);
2852
2853 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2854 if (!IS_ERR(srp_dev->fmr_pool))
2855 break;
2856 }
2857
f5358a17
RD		 2858 if (IS_ERR(srp_dev->fmr_pool))
2859 srp_dev->fmr_pool = NULL;
aef9ec39 2860
07ebafba 2861 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2862 s = 0;
2863 e = 0;
2864 } else {
2865 s = 1;
2866 e = device->phys_port_cnt;
2867 }
2868
2869 for (p = s; p <= e; ++p) {
f5358a17 2870 host = srp_add_port(srp_dev, p);
aef9ec39 2871 if (host)
f5358a17 2872 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2873 }
2874
f5358a17
RD		 2875 ib_set_client_data(device, &srp_client, srp_dev);
2876
2877 goto free_attr;
2878
2879err_pd:
2880 ib_dealloc_pd(srp_dev->pd);
2881
2882free_dev:
2883 kfree(srp_dev);
2884
2885free_attr:
2886 kfree(dev_attr);
aef9ec39
RD		 2887}
2888
2889static void srp_remove_one(struct ib_device *device)
2890{
f5358a17 2891 struct srp_device *srp_dev;
aef9ec39 2892 struct srp_host *host, *tmp_host;
ef6c49d8 2893 struct srp_target_port *target;
aef9ec39 2894
f5358a17 2895 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 2896 if (!srp_dev)
2897 return;
aef9ec39 2898
f5358a17 2899 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2900 device_unregister(&host->dev);
aef9ec39
RD		 2901 /*
2902 * Wait for the sysfs entry to go away, so that no new
2903 * target ports can be created.
2904 */
2905 wait_for_completion(&host->released);
2906
2907 /*
ef6c49d8 2908 * Remove all target ports.
aef9ec39 2909 */
b3589fd4 2910 spin_lock(&host->target_lock);
ef6c49d8
BVA		 2911 list_for_each_entry(target, &host->target_list, list)
2912 srp_queue_remove_work(target);
b3589fd4 2913 spin_unlock(&host->target_lock);
aef9ec39
RD		 2914
2915 /*
ef6c49d8 2916 * Wait for target port removal tasks.
aef9ec39 2917 */
ef6c49d8 2918 flush_workqueue(system_long_wq);
aef9ec39 2919
aef9ec39
RD		 2920 kfree(host);
2921 }
2922
f5358a17
RD		 2923 if (srp_dev->fmr_pool)
2924 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2925 ib_dereg_mr(srp_dev->mr);
2926 ib_dealloc_pd(srp_dev->pd);
2927
2928 kfree(srp_dev);
aef9ec39
RD		 2929}
2930
3236822b 2931static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 2932 .has_rport_state = true,
2933 .reset_timer_if_blocked = true,
a95cadb9 2934 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 2935 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
2936 .dev_loss_tmo = &srp_dev_loss_tmo,
2937 .reconnect = srp_rport_reconnect,
dc1bdbd9 2938 .rport_delete = srp_rport_delete,
ed9b2264 2939 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 2940};
2941
aef9ec39
RD		 2942static int __init srp_init_module(void)
2943{
2944 int ret;
2945
dcb4cb85 2946 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 2947
49248644 2948 if (srp_sg_tablesize) {
e0bda7d8 2949 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 2950 if (!cmd_sg_entries)
2951 cmd_sg_entries = srp_sg_tablesize;
2952 }
2953
2954 if (!cmd_sg_entries)
2955 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2956
2957 if (cmd_sg_entries > 255) {
e0bda7d8 2958 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 2959 cmd_sg_entries = 255;
1e89a194
DD		 2960 }
2961
c07d424d
DD		 2962 if (!indirect_sg_entries)
2963 indirect_sg_entries = cmd_sg_entries;
2964 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 2965 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2966 cmd_sg_entries);
c07d424d
DD		 2967 indirect_sg_entries = cmd_sg_entries;
2968 }
2969
3236822b
FT		 2970 ib_srp_transport_template =
2971 srp_attach_transport(&ib_srp_transport_functions);
2972 if (!ib_srp_transport_template)
2973 return -ENOMEM;
2974
aef9ec39
RD		 2975 ret = class_register(&srp_class);
2976 if (ret) {
e0bda7d8 2977 pr_err("couldn't register class infiniband_srp\n");
3236822b 2978 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2979 return ret;
2980 }
2981
c1a0b23b
MT		 2982 ib_sa_register_client(&srp_sa_client);
2983
aef9ec39
RD		 2984 ret = ib_register_client(&srp_client);
2985 if (ret) {
e0bda7d8 2986 pr_err("couldn't register IB client\n");
3236822b 2987 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2988 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2989 class_unregister(&srp_class);
2990 return ret;
2991 }
2992
2993 return 0;
2994}
2995
2996static void __exit srp_cleanup_module(void)
2997{
2998 ib_unregister_client(&srp_client);
c1a0b23b 2999 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 3000 class_unregister(&srp_class);
3236822b 3001 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 3002}
3003
3004module_init(srp_init_module);
3005module_exit(srp_cleanup_module);
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