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IB/srp: Fix kernel-doc warnings
[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.
af24663b
BVA		 816 * @target: SRP target port.
817 * @req: Request to be freed.
818 * @scmnd: SCSI command associated with @req.
819 * @req_lim_delta: Amount to be added to @target->req_lim.
22032991
BVA		 820 */
821static void srp_free_req(struct srp_target_port *target,
822 struct srp_request *req, struct scsi_cmnd *scmnd,
823 s32 req_lim_delta)
526b4caa 824{
94a9174c
BVA		 825 unsigned long flags;
826
22032991
BVA		 827 srp_unmap_data(scmnd, target, req);
828
e9684678 829 spin_lock_irqsave(&target->lock, flags);
94a9174c 830 target->req_lim += req_lim_delta;
536ae14e 831 list_add_tail(&req->list, &target->free_reqs);
e9684678 832 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 833}
834
ed9b2264 835static void srp_finish_req(struct srp_target_port *target,
b3fe628d
BVA		 836 struct srp_request *req, struct scsi_device *sdev,
837 int result)
526b4caa 838{
b3fe628d 839 struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
22032991
BVA		 840
841 if (scmnd) {
9b796d06 842 srp_free_req(target, req, scmnd, 0);
ed9b2264 843 scmnd->result = result;
22032991 844 scmnd->scsi_done(scmnd);
22032991 845 }
526b4caa
IR		 846}
847
ed9b2264 848static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 849{
ed9b2264 850 struct srp_target_port *target = rport->lld_data;
b3fe628d
BVA		 851 struct Scsi_Host *shost = target->scsi_host;
852 struct scsi_device *sdev;
ed9b2264
BVA		 853 int i;
854
b3fe628d
BVA		 855 /*
856 * Invoking srp_terminate_io() while srp_queuecommand() is running
857 * is not safe. Hence the warning statement below.
858 */
859 shost_for_each_device(sdev, shost)
860 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
861
4d73f95f 862 for (i = 0; i < target->req_ring_size; ++i) {
ed9b2264 863 struct srp_request *req = &target->req_ring[i];
b3fe628d 864 srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
ed9b2264
BVA		 865 }
866}
aef9ec39 867
ed9b2264
BVA		 868/*
869 * It is up to the caller to ensure that srp_rport_reconnect() calls are
870 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
871 * srp_reset_device() or srp_reset_host() calls will occur while this function
872 * is in progress. One way to realize that is not to call this function
873 * directly but to call srp_reconnect_rport() instead since that last function
874 * serializes calls of this function via rport->mutex and also blocks
875 * srp_queuecommand() calls before invoking this function.
876 */
877static int srp_rport_reconnect(struct srp_rport *rport)
878{
879 struct srp_target_port *target = rport->lld_data;
880 int i, ret;
09be70a2 881
aef9ec39
RD		 882 srp_disconnect_target(target);
883 /*
c7c4e7ff
BVA		 884 * Now get a new local CM ID so that we avoid confusing the target in
885 * case things are really fouled up. Doing so also ensures that all CM
886 * callbacks will have finished before a new QP is allocated.
aef9ec39 887 */
9fe4bcf4 888 ret = srp_new_cm_id(target);
c7c4e7ff
BVA		 889 /*
890 * Whether or not creating a new CM ID succeeded, create a new
891 * QP. This guarantees that all completion callback function
892 * invocations have finished before request resetting starts.
893 */
894 if (ret == 0)
895 ret = srp_create_target_ib(target);
896 else
897 srp_create_target_ib(target);
aef9ec39 898
4d73f95f 899 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 900 struct srp_request *req = &target->req_ring[i];
b3fe628d 901 srp_finish_req(target, req, NULL, DID_RESET << 16);
536ae14e 902 }
aef9ec39 903
536ae14e 904 INIT_LIST_HEAD(&target->free_tx);
4d73f95f 905 for (i = 0; i < target->queue_size; ++i)
536ae14e 906 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 907
c7c4e7ff
BVA		 908 if (ret == 0)
909 ret = srp_connect_target(target);
09be70a2 910
ed9b2264
BVA		 911 if (ret == 0)
912 shost_printk(KERN_INFO, target->scsi_host,
913 PFX "reconnect succeeded\n");
aef9ec39
RD		 914
915 return ret;
916}
917
8f26c9ff
DD		 918static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
919 unsigned int dma_len, u32 rkey)
f5358a17 920{
8f26c9ff 921 struct srp_direct_buf *desc = state->desc;
f5358a17 922
8f26c9ff
DD		 923 desc->va = cpu_to_be64(dma_addr);
924 desc->key = cpu_to_be32(rkey);
925 desc->len = cpu_to_be32(dma_len);
f5358a17 926
8f26c9ff
DD		 927 state->total_len += dma_len;
928 state->desc++;
929 state->ndesc++;
930}
559ce8f1 931
8f26c9ff
DD		 932static int srp_map_finish_fmr(struct srp_map_state *state,
933 struct srp_target_port *target)
934{
935 struct srp_device *dev = target->srp_host->srp_dev;
936 struct ib_pool_fmr *fmr;
937 u64 io_addr = 0;
85507bcc 938
8f26c9ff
DD		 939 if (!state->npages)
940 return 0;
f5358a17 941
8f26c9ff
DD		 942 if (state->npages == 1) {
943 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
944 target->rkey);
945 state->npages = state->fmr_len = 0;
946 return 0;
f5358a17
RD		 947 }
948
8f26c9ff
DD		 949 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
950 state->npages, io_addr);
951 if (IS_ERR(fmr))
952 return PTR_ERR(fmr);
f5358a17 953
8f26c9ff
DD		 954 *state->next_fmr++ = fmr;
955 state->nfmr++;
f5358a17 956
8f26c9ff
DD		 957 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
958 state->npages = state->fmr_len = 0;
959 return 0;
960}
961
962static void srp_map_update_start(struct srp_map_state *state,
963 struct scatterlist *sg, int sg_index,
964 dma_addr_t dma_addr)
965{
966 state->unmapped_sg = sg;
967 state->unmapped_index = sg_index;
968 state->unmapped_addr = dma_addr;
969}
85507bcc 970
8f26c9ff
DD		 971static int srp_map_sg_entry(struct srp_map_state *state,
972 struct srp_target_port *target,
973 struct scatterlist *sg, int sg_index,
974 int use_fmr)
975{
976 struct srp_device *dev = target->srp_host->srp_dev;
977 struct ib_device *ibdev = dev->dev;
978 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
979 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
980 unsigned int len;
981 int ret;
982
983 if (!dma_len)
984 return 0;
985
986 if (use_fmr == SRP_MAP_NO_FMR) {
987 /* Once we're in direct map mode for a request, we don't
988 * go back to FMR mode, so no need to update anything
989 * other than the descriptor.
990 */
991 srp_map_desc(state, dma_addr, dma_len, target->rkey);
992 return 0;
85507bcc 993 }
f5358a17 994
8f26c9ff
DD		 995 /* If we start at an offset into the FMR page, don't merge into
996 * the current FMR. Finish it out, and use the kernel's MR for this
997 * sg entry. This is to avoid potential bugs on some SRP targets
998 * that were never quite defined, but went away when the initiator
999 * avoided using FMR on such page fragments.
1000 */
1001 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
1002 ret = srp_map_finish_fmr(state, target);
1003 if (ret)
1004 return ret;
1005
1006 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1007 srp_map_update_start(state, NULL, 0, 0);
1008 return 0;
f5358a17
RD		 1009 }
1010
8f26c9ff
DD		 1011 /* If this is the first sg to go into the FMR, save our position.
1012 * We need to know the first unmapped entry, its index, and the
1013 * first unmapped address within that entry to be able to restart
1014 * mapping after an error.
1015 */
1016 if (!state->unmapped_sg)
1017 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 1018
8f26c9ff
DD		 1019 while (dma_len) {
1020 if (state->npages == SRP_FMR_SIZE) {
1021 ret = srp_map_finish_fmr(state, target);
1022 if (ret)
1023 return ret;
f5358a17 1024
8f26c9ff
DD		 1025 srp_map_update_start(state, sg, sg_index, dma_addr);
1026 }
1027
1028 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
f5358a17 1029
8f26c9ff
DD		 1030 if (!state->npages)
1031 state->base_dma_addr = dma_addr;
1032 state->pages[state->npages++] = dma_addr;
1033 state->fmr_len += len;
1034 dma_addr += len;
1035 dma_len -= len;
1036 }
1037
1038 /* If the last entry of the FMR wasn't a full page, then we need to
1039 * close it out and start a new one -- we can only merge at page
1040 * boundries.
1041 */
1042 ret = 0;
1043 if (len != dev->fmr_page_size) {
1044 ret = srp_map_finish_fmr(state, target);
1045 if (!ret)
1046 srp_map_update_start(state, NULL, 0, 0);
1047 }
f5358a17
RD		 1048 return ret;
1049}
1050
aef9ec39
RD		 1051static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1052 struct srp_request *req)
1053{
8f26c9ff 1054 struct scatterlist *scat, *sg;
aef9ec39 1055 struct srp_cmd *cmd = req->cmd->buf;
8f26c9ff 1056 int i, len, nents, count, use_fmr;
85507bcc
RC		 1057 struct srp_device *dev;
1058 struct ib_device *ibdev;
8f26c9ff
DD		 1059 struct srp_map_state state;
1060 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 1061 u32 table_len;
1062 u8 fmt;
aef9ec39 1063
bb350d1d 1064 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 1065 return sizeof (struct srp_cmd);
1066
1067 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1068 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 1069 shost_printk(KERN_WARNING, target->scsi_host,
1070 PFX "Unhandled data direction %d\n",
1071 scmnd->sc_data_direction);
aef9ec39
RD		 1072 return -EINVAL;
1073 }
1074
bb350d1d
FT		 1075 nents = scsi_sg_count(scmnd);
1076 scat = scsi_sglist(scmnd);
aef9ec39 1077
05321937 1078 dev = target->srp_host->srp_dev;
85507bcc
RC		 1079 ibdev = dev->dev;
1080
1081 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 1082 if (unlikely(count == 0))
1083 return -EIO;
f5358a17
RD		 1084
1085 fmt = SRP_DATA_DESC_DIRECT;
1086 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1087
cf368713 1088 if (count == 1) {
f5358a17
RD		 1089 /*
1090 * The midlayer only generated a single gather/scatter
1091 * entry, or DMA mapping coalesced everything to a
1092 * single entry. So a direct descriptor along with
1093 * the DMA MR suffices.
1094 */
cf368713 1095 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1096
85507bcc 1097 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1098 buf->key = cpu_to_be32(target->rkey);
85507bcc 1099 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff
DD		 1100
1101 req->nfmr = 0;
1102 goto map_complete;
1103 }
1104
1105 /* We have more than one scatter/gather entry, so build our indirect
1106 * descriptor table, trying to merge as many entries with FMR as we
1107 * can.
1108 */
1109 indirect_hdr = (void *) cmd->add_data;
1110
c07d424d
DD		 1111 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1112 target->indirect_size, DMA_TO_DEVICE);
1113
8f26c9ff 1114 memset(&state, 0, sizeof(state));
c07d424d 1115 state.desc = req->indirect_desc;
8f26c9ff
DD		 1116 state.pages = req->map_page;
1117 state.next_fmr = req->fmr_list;
1118
1119 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
1120
1121 for_each_sg(scat, sg, count, i) {
1122 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
1123 /* FMR mapping failed, so backtrack to the first
1124 * unmapped entry and continue on without using FMR.
1125 */
1126 dma_addr_t dma_addr;
1127 unsigned int dma_len;
1128
1129backtrack:
1130 sg = state.unmapped_sg;
1131 i = state.unmapped_index;
1132
1133 dma_addr = ib_sg_dma_address(ibdev, sg);
1134 dma_len = ib_sg_dma_len(ibdev, sg);
1135 dma_len -= (state.unmapped_addr - dma_addr);
1136 dma_addr = state.unmapped_addr;
1137 use_fmr = SRP_MAP_NO_FMR;
1138 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
f5358a17 1139 }
8f26c9ff 1140 }
aef9ec39 1141
8f26c9ff
DD		 1142 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
1143 goto backtrack;
cf368713 1144
c07d424d
DD		 1145 /* We've mapped the request, now pull as much of the indirect
1146 * descriptor table as we can into the command buffer. If this
1147 * target is not using an external indirect table, we are
1148 * guaranteed to fit into the command, as the SCSI layer won't
1149 * give us more S/G entries than we allow.
8f26c9ff
DD		 1150 */
1151 req->nfmr = state.nfmr;
1152 if (state.ndesc == 1) {
1153 /* FMR mapping was able to collapse this to one entry,
1154 * so use a direct descriptor.
1155 */
1156 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1157
c07d424d 1158 *buf = req->indirect_desc[0];
8f26c9ff 1159 goto map_complete;
aef9ec39
RD		 1160 }
1161
c07d424d
DD		 1162 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1163 !target->allow_ext_sg)) {
1164 shost_printk(KERN_ERR, target->scsi_host,
1165 "Could not fit S/G list into SRP_CMD\n");
1166 return -EIO;
1167 }
1168
1169 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1170 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1171
1172 fmt = SRP_DATA_DESC_INDIRECT;
1173 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1174 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1175
c07d424d
DD		 1176 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1177 count * sizeof (struct srp_direct_buf));
8f26c9ff 1178
c07d424d 1179 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1180 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1181 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1182 indirect_hdr->len = cpu_to_be32(state.total_len);
1183
1184 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1185 cmd->data_out_desc_cnt = count;
8f26c9ff 1186 else
c07d424d
DD		 1187 cmd->data_in_desc_cnt = count;
1188
1189 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1190 DMA_TO_DEVICE);
8f26c9ff
DD		 1191
1192map_complete:
aef9ec39
RD		 1193 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1194 cmd->buf_fmt = fmt << 4;
1195 else
1196 cmd->buf_fmt = fmt;
1197
aef9ec39
RD		 1198 return len;
1199}
1200
76c75b25
BVA		 1201/*
1202 * Return an IU and possible credit to the free pool
1203 */
1204static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1205 enum srp_iu_type iu_type)
1206{
1207 unsigned long flags;
1208
e9684678 1209 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1210 list_add(&iu->list, &target->free_tx);
1211 if (iu_type != SRP_IU_RSP)
1212 ++target->req_lim;
e9684678 1213 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1214}
1215
05a1d750 1216/*
e9684678
BVA		 1217 * Must be called with target->lock held to protect req_lim and free_tx.
1218 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1219 *
1220 * Note:
1221 * An upper limit for the number of allocated information units for each
1222 * request type is:
1223 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1224 * more than Scsi_Host.can_queue requests.
1225 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1226 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1227 * one unanswered SRP request to an initiator.
1228 */
1229static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1230 enum srp_iu_type iu_type)
1231{
1232 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1233 struct srp_iu *iu;
1234
1235 srp_send_completion(target->send_cq, target);
1236
dcb4cb85 1237 if (list_empty(&target->free_tx))
05a1d750
DD		 1238 return NULL;
1239
1240 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1241 if (iu_type != SRP_IU_RSP) {
1242 if (target->req_lim <= rsv) {
1243 ++target->zero_req_lim;
1244 return NULL;
1245 }
1246
1247 --target->req_lim;
05a1d750
DD		 1248 }
1249
dcb4cb85 1250 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1251 list_del(&iu->list);
05a1d750
DD		 1252 return iu;
1253}
1254
76c75b25
BVA		 1255static int srp_post_send(struct srp_target_port *target,
1256 struct srp_iu *iu, int len)
05a1d750
DD		 1257{
1258 struct ib_sge list;
1259 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1260
1261 list.addr = iu->dma;
1262 list.length = len;
9af76271 1263 list.lkey = target->lkey;
05a1d750
DD		 1264
1265 wr.next = NULL;
dcb4cb85 1266 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1267 wr.sg_list = &list;
1268 wr.num_sge = 1;
1269 wr.opcode = IB_WR_SEND;
1270 wr.send_flags = IB_SEND_SIGNALED;
1271
76c75b25 1272 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1273}
1274
dcb4cb85 1275static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1276{
c996bb47 1277 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1278 struct ib_sge list;
c996bb47
BVA		 1279
1280 list.addr = iu->dma;
1281 list.length = iu->size;
9af76271 1282 list.lkey = target->lkey;
c996bb47
BVA		 1283
1284 wr.next = NULL;
dcb4cb85 1285 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1286 wr.sg_list = &list;
1287 wr.num_sge = 1;
1288
dcb4cb85 1289 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1290}
1291
aef9ec39
RD		 1292static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1293{
1294 struct srp_request *req;
1295 struct scsi_cmnd *scmnd;
1296 unsigned long flags;
aef9ec39 1297
aef9ec39 1298 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1299 spin_lock_irqsave(&target->lock, flags);
94a9174c 1300 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1301 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1302
f8b6e31e
DD		 1303 target->tsk_mgmt_status = -1;
1304 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1305 target->tsk_mgmt_status = rsp->data[3];
1306 complete(&target->tsk_mgmt_done);
aef9ec39 1307 } else {
f8b6e31e 1308 req = &target->req_ring[rsp->tag];
b3fe628d 1309 scmnd = srp_claim_req(target, req, NULL, NULL);
22032991 1310 if (!scmnd) {
7aa54bd7
DD		 1311 shost_printk(KERN_ERR, target->scsi_host,
1312 "Null scmnd for RSP w/tag %016llx\n",
1313 (unsigned long long) rsp->tag);
22032991
BVA		 1314
1315 spin_lock_irqsave(&target->lock, flags);
1316 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1317 spin_unlock_irqrestore(&target->lock, flags);
1318
1319 return;
1320 }
aef9ec39
RD		 1321 scmnd->result = rsp->status;
1322
1323 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1324 memcpy(scmnd->sense_buffer, rsp->data +
1325 be32_to_cpu(rsp->resp_data_len),
1326 min_t(int, be32_to_cpu(rsp->sense_data_len),
1327 SCSI_SENSE_BUFFERSIZE));
1328 }
1329
1330 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1331 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1332 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1333 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1334
22032991
BVA		 1335 srp_free_req(target, req, scmnd,
1336 be32_to_cpu(rsp->req_lim_delta));
1337
f8b6e31e
DD		 1338 scmnd->host_scribble = NULL;
1339 scmnd->scsi_done(scmnd);
aef9ec39 1340 }
aef9ec39
RD		 1341}
1342
bb12588a
DD		 1343static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1344 void *rsp, int len)
1345{
76c75b25 1346 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1347 unsigned long flags;
1348 struct srp_iu *iu;
76c75b25 1349 int err;
bb12588a 1350
e9684678 1351 spin_lock_irqsave(&target->lock, flags);
bb12588a 1352 target->req_lim += req_delta;
bb12588a 1353 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1354 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1355
bb12588a
DD		 1356 if (!iu) {
1357 shost_printk(KERN_ERR, target->scsi_host, PFX
1358 "no IU available to send response\n");
76c75b25 1359 return 1;
bb12588a
DD		 1360 }
1361
1362 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1363 memcpy(iu->buf, rsp, len);
1364 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1365
76c75b25
BVA		 1366 err = srp_post_send(target, iu, len);
1367 if (err) {
bb12588a
DD		 1368 shost_printk(KERN_ERR, target->scsi_host, PFX
1369 "unable to post response: %d\n", err);
76c75b25
BVA		 1370 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1371 }
bb12588a 1372
bb12588a
DD		 1373 return err;
1374}
1375
1376static void srp_process_cred_req(struct srp_target_port *target,
1377 struct srp_cred_req *req)
1378{
1379 struct srp_cred_rsp rsp = {
1380 .opcode = SRP_CRED_RSP,
1381 .tag = req->tag,
1382 };
1383 s32 delta = be32_to_cpu(req->req_lim_delta);
1384
1385 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1386 shost_printk(KERN_ERR, target->scsi_host, PFX
1387 "problems processing SRP_CRED_REQ\n");
1388}
1389
1390static void srp_process_aer_req(struct srp_target_port *target,
1391 struct srp_aer_req *req)
1392{
1393 struct srp_aer_rsp rsp = {
1394 .opcode = SRP_AER_RSP,
1395 .tag = req->tag,
1396 };
1397 s32 delta = be32_to_cpu(req->req_lim_delta);
1398
1399 shost_printk(KERN_ERR, target->scsi_host, PFX
1400 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1401
1402 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1403 shost_printk(KERN_ERR, target->scsi_host, PFX
1404 "problems processing SRP_AER_REQ\n");
1405}
1406
aef9ec39
RD		 1407static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1408{
dcb4cb85 1409 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1410 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1411 int res;
aef9ec39
RD		 1412 u8 opcode;
1413
85507bcc
RC		 1414 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1415 DMA_FROM_DEVICE);
aef9ec39
RD		 1416
1417 opcode = *(u8 *) iu->buf;
1418
1419 if (0) {
7aa54bd7
DD		 1420 shost_printk(KERN_ERR, target->scsi_host,
1421 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1422 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1423 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1424 }
1425
1426 switch (opcode) {
1427 case SRP_RSP:
1428 srp_process_rsp(target, iu->buf);
1429 break;
1430
bb12588a
DD		 1431 case SRP_CRED_REQ:
1432 srp_process_cred_req(target, iu->buf);
1433 break;
1434
1435 case SRP_AER_REQ:
1436 srp_process_aer_req(target, iu->buf);
1437 break;
1438
aef9ec39
RD		 1439 case SRP_T_LOGOUT:
1440 /* XXX Handle target logout */
7aa54bd7
DD		 1441 shost_printk(KERN_WARNING, target->scsi_host,
1442 PFX "Got target logout request\n");
aef9ec39
RD		 1443 break;
1444
1445 default:
7aa54bd7
DD		 1446 shost_printk(KERN_WARNING, target->scsi_host,
1447 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1448 break;
1449 }
1450
85507bcc
RC		 1451 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1452 DMA_FROM_DEVICE);
c996bb47 1453
dcb4cb85 1454 res = srp_post_recv(target, iu);
c996bb47
BVA		 1455 if (res != 0)
1456 shost_printk(KERN_ERR, target->scsi_host,
1457 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1458}
1459
c1120f89
BVA		 1460/**
1461 * srp_tl_err_work() - handle a transport layer error
af24663b 1462 * @work: Work structure embedded in an SRP target port.
c1120f89
BVA		 1463 *
1464 * Note: This function may get invoked before the rport has been created,
1465 * hence the target->rport test.
1466 */
1467static void srp_tl_err_work(struct work_struct *work)
1468{
1469 struct srp_target_port *target;
1470
1471 target = container_of(work, struct srp_target_port, tl_err_work);
1472 if (target->rport)
1473 srp_start_tl_fail_timers(target->rport);
1474}
1475
cd4e3854 1476static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
948d1e88
BVA		 1477 struct srp_target_port *target)
1478{
294c875a 1479 if (target->connected && !target->qp_in_error) {
4f0af697
BVA		 1480 shost_printk(KERN_ERR, target->scsi_host,
1481 PFX "failed %s status %d\n",
cd4e3854 1482 send_err ? "send" : "receive",
4f0af697 1483 wc_status);
c1120f89 1484 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1485 }
948d1e88
BVA		 1486 target->qp_in_error = true;
1487}
1488
9c03dc9f 1489static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1490{
1491 struct srp_target_port *target = target_ptr;
1492 struct ib_wc wc;
aef9ec39
RD		 1493
1494 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1495 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1496 if (likely(wc.status == IB_WC_SUCCESS)) {
1497 srp_handle_recv(target, &wc);
1498 } else {
cd4e3854 1499 srp_handle_qp_err(wc.status, false, target);
aef9ec39 1500 }
9c03dc9f
BVA		 1501 }
1502}
1503
1504static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1505{
1506 struct srp_target_port *target = target_ptr;
1507 struct ib_wc wc;
dcb4cb85 1508 struct srp_iu *iu;
9c03dc9f
BVA		 1509
1510 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1511 if (likely(wc.status == IB_WC_SUCCESS)) {
1512 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1513 list_add(&iu->list, &target->free_tx);
1514 } else {
cd4e3854 1515 srp_handle_qp_err(wc.status, true, target);
9c03dc9f 1516 }
aef9ec39
RD		 1517 }
1518}
1519
76c75b25 1520static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1521{
76c75b25 1522 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1523 struct srp_rport *rport = target->rport;
aef9ec39
RD		 1524 struct srp_request *req;
1525 struct srp_iu *iu;
1526 struct srp_cmd *cmd;
85507bcc 1527 struct ib_device *dev;
76c75b25 1528 unsigned long flags;
ed9b2264 1529 int len, result;
a95cadb9
BVA		 1530 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1531
1532 /*
1533 * The SCSI EH thread is the only context from which srp_queuecommand()
1534 * can get invoked for blocked devices (SDEV_BLOCK /
1535 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1536 * locking the rport mutex if invoked from inside the SCSI EH.
1537 */
1538 if (in_scsi_eh)
1539 mutex_lock(&rport->mutex);
aef9ec39 1540
ed9b2264
BVA		 1541 result = srp_chkready(target->rport);
1542 if (unlikely(result)) {
1543 scmnd->result = result;
2ce19e72 1544 scmnd->scsi_done(scmnd);
a95cadb9 1545 goto unlock_rport;
2ce19e72
BVA		 1546 }
1547
e9684678 1548 spin_lock_irqsave(&target->lock, flags);
bb12588a 1549 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1550 if (!iu)
695b8349
BVA		 1551 goto err_unlock;
1552
1553 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1554 list_del(&req->list);
1555 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1556
05321937 1557 dev = target->srp_host->srp_dev->dev;
49248644 1558 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1559 DMA_TO_DEVICE);
aef9ec39 1560
aef9ec39 1561 scmnd->result = 0;
f8b6e31e 1562 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1563
1564 cmd = iu->buf;
1565 memset(cmd, 0, sizeof *cmd);
1566
1567 cmd->opcode = SRP_CMD;
1568 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1569 cmd->tag = req->index;
aef9ec39
RD		 1570 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1571
aef9ec39
RD		 1572 req->scmnd = scmnd;
1573 req->cmd = iu;
aef9ec39
RD		 1574
1575 len = srp_map_data(scmnd, target, req);
1576 if (len < 0) {
7aa54bd7
DD		 1577 shost_printk(KERN_ERR, target->scsi_host,
1578 PFX "Failed to map data\n");
76c75b25 1579 goto err_iu;
aef9ec39
RD		 1580 }
1581
49248644 1582 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1583 DMA_TO_DEVICE);
aef9ec39 1584
76c75b25 1585 if (srp_post_send(target, iu, len)) {
7aa54bd7 1586 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1587 goto err_unmap;
1588 }
1589
a95cadb9
BVA		 1590unlock_rport:
1591 if (in_scsi_eh)
1592 mutex_unlock(&rport->mutex);
1593
aef9ec39
RD		 1594 return 0;
1595
1596err_unmap:
1597 srp_unmap_data(scmnd, target, req);
1598
76c75b25
BVA		 1599err_iu:
1600 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1601
024ca901
BVA		 1602 /*
1603 * Avoid that the loops that iterate over the request ring can
1604 * encounter a dangling SCSI command pointer.
1605 */
1606 req->scmnd = NULL;
1607
e9684678 1608 spin_lock_irqsave(&target->lock, flags);
76c75b25 1609 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1610
1611err_unlock:
e9684678 1612 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1613
a95cadb9
BVA		 1614 if (in_scsi_eh)
1615 mutex_unlock(&rport->mutex);
1616
aef9ec39
RD		 1617 return SCSI_MLQUEUE_HOST_BUSY;
1618}
1619
4d73f95f
BVA		 1620/*
1621 * Note: the resources allocated in this function are freed in
1622 * srp_free_target_ib().
1623 */
aef9ec39
RD		 1624static int srp_alloc_iu_bufs(struct srp_target_port *target)
1625{
1626 int i;
1627
4d73f95f
BVA		 1628 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1629 GFP_KERNEL);
1630 if (!target->rx_ring)
1631 goto err_no_ring;
1632 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1633 GFP_KERNEL);
1634 if (!target->tx_ring)
1635 goto err_no_ring;
1636
1637 for (i = 0; i < target->queue_size; ++i) {
aef9ec39
RD		 1638 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1639 target->max_ti_iu_len,
1640 GFP_KERNEL, DMA_FROM_DEVICE);
1641 if (!target->rx_ring[i])
1642 goto err;
1643 }
1644
4d73f95f 1645 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1646 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1647 target->max_iu_len,
aef9ec39
RD		 1648 GFP_KERNEL, DMA_TO_DEVICE);
1649 if (!target->tx_ring[i])
1650 goto err;
dcb4cb85
BVA		 1651
1652 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1653 }
1654
1655 return 0;
1656
1657err:
4d73f95f 1658 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1659 srp_free_iu(target->srp_host, target->rx_ring[i]);
aef9ec39 1660 srp_free_iu(target->srp_host, target->tx_ring[i]);
aef9ec39
RD		 1661 }
1662
4d73f95f
BVA		 1663
1664err_no_ring:
1665 kfree(target->tx_ring);
1666 target->tx_ring = NULL;
1667 kfree(target->rx_ring);
1668 target->rx_ring = NULL;
1669
aef9ec39
RD		 1670 return -ENOMEM;
1671}
1672
c9b03c1a
BVA		 1673static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1674{
1675 uint64_t T_tr_ns, max_compl_time_ms;
1676 uint32_t rq_tmo_jiffies;
1677
1678 /*
1679 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1680 * table 91), both the QP timeout and the retry count have to be set
1681 * for RC QP's during the RTR to RTS transition.
1682 */
1683 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1684 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1685
1686 /*
1687 * Set target->rq_tmo_jiffies to one second more than the largest time
1688 * it can take before an error completion is generated. See also
1689 * C9-140..142 in the IBTA spec for more information about how to
1690 * convert the QP Local ACK Timeout value to nanoseconds.
1691 */
1692 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1693 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1694 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1695 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1696
1697 return rq_tmo_jiffies;
1698}
1699
961e0be8
DD		 1700static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1701 struct srp_login_rsp *lrsp,
1702 struct srp_target_port *target)
1703{
1704 struct ib_qp_attr *qp_attr = NULL;
1705 int attr_mask = 0;
1706 int ret;
1707 int i;
1708
1709 if (lrsp->opcode == SRP_LOGIN_RSP) {
1710 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1711 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1712
1713 /*
1714 * Reserve credits for task management so we don't
1715 * bounce requests back to the SCSI mid-layer.
1716 */
1717 target->scsi_host->can_queue
1718 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1719 target->scsi_host->can_queue);
4d73f95f
BVA		 1720 target->scsi_host->cmd_per_lun
1721 = min_t(int, target->scsi_host->can_queue,
1722 target->scsi_host->cmd_per_lun);
961e0be8
DD		 1723 } else {
1724 shost_printk(KERN_WARNING, target->scsi_host,
1725 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1726 ret = -ECONNRESET;
1727 goto error;
1728 }
1729
4d73f95f 1730 if (!target->rx_ring) {
961e0be8
DD		 1731 ret = srp_alloc_iu_bufs(target);
1732 if (ret)
1733 goto error;
1734 }
1735
1736 ret = -ENOMEM;
1737 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1738 if (!qp_attr)
1739 goto error;
1740
1741 qp_attr->qp_state = IB_QPS_RTR;
1742 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1743 if (ret)
1744 goto error_free;
1745
1746 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1747 if (ret)
1748 goto error_free;
1749
4d73f95f 1750 for (i = 0; i < target->queue_size; i++) {
961e0be8
DD		 1751 struct srp_iu *iu = target->rx_ring[i];
1752 ret = srp_post_recv(target, iu);
1753 if (ret)
1754 goto error_free;
1755 }
1756
1757 qp_attr->qp_state = IB_QPS_RTS;
1758 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1759 if (ret)
1760 goto error_free;
1761
c9b03c1a
BVA		 1762 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1763
961e0be8
DD		 1764 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1765 if (ret)
1766 goto error_free;
1767
1768 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1769
1770error_free:
1771 kfree(qp_attr);
1772
1773error:
1774 target->status = ret;
1775}
1776
aef9ec39
RD		 1777static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1778 struct ib_cm_event *event,
1779 struct srp_target_port *target)
1780{
7aa54bd7 1781 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1782 struct ib_class_port_info *cpi;
1783 int opcode;
1784
1785 switch (event->param.rej_rcvd.reason) {
1786 case IB_CM_REJ_PORT_CM_REDIRECT:
1787 cpi = event->param.rej_rcvd.ari;
1788 target->path.dlid = cpi->redirect_lid;
1789 target->path.pkey = cpi->redirect_pkey;
1790 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1791 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1792
1793 target->status = target->path.dlid ?
1794 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1795 break;
1796
1797 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1798 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1799 /*
1800 * Topspin/Cisco SRP gateways incorrectly send
1801 * reject reason code 25 when they mean 24
1802 * (port redirect).
1803 */
1804 memcpy(target->path.dgid.raw,
1805 event->param.rej_rcvd.ari, 16);
1806
7aa54bd7
DD		 1807 shost_printk(KERN_DEBUG, shost,
1808 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1809 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1810 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1811
1812 target->status = SRP_PORT_REDIRECT;
1813 } else {
7aa54bd7
DD		 1814 shost_printk(KERN_WARNING, shost,
1815 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1816 target->status = -ECONNRESET;
1817 }
1818 break;
1819
1820 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1821 shost_printk(KERN_WARNING, shost,
1822 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1823 target->status = -ECONNRESET;
1824 break;
1825
1826 case IB_CM_REJ_CONSUMER_DEFINED:
1827 opcode = *(u8 *) event->private_data;
1828 if (opcode == SRP_LOGIN_REJ) {
1829 struct srp_login_rej *rej = event->private_data;
1830 u32 reason = be32_to_cpu(rej->reason);
1831
1832 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1833 shost_printk(KERN_WARNING, shost,
1834 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1835 else
e7ffde01
BVA		 1836 shost_printk(KERN_WARNING, shost, PFX
1837 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
1838 target->path.sgid.raw,
1839 target->orig_dgid, reason);
aef9ec39 1840 } else
7aa54bd7
DD		 1841 shost_printk(KERN_WARNING, shost,
1842 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1843 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1844 target->status = -ECONNRESET;
1845 break;
1846
9fe4bcf4
DD		 1847 case IB_CM_REJ_STALE_CONN:
1848 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1849 target->status = SRP_STALE_CONN;
1850 break;
1851
aef9ec39 1852 default:
7aa54bd7
DD		 1853 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1854 event->param.rej_rcvd.reason);
aef9ec39
RD		 1855 target->status = -ECONNRESET;
1856 }
1857}
1858
1859static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1860{
1861 struct srp_target_port *target = cm_id->context;
aef9ec39 1862 int comp = 0;
aef9ec39
RD		 1863
1864 switch (event->event) {
1865 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1866 shost_printk(KERN_DEBUG, target->scsi_host,
1867 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1868 comp = 1;
1869 target->status = -ECONNRESET;
1870 break;
1871
1872 case IB_CM_REP_RECEIVED:
1873 comp = 1;
961e0be8 1874 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 1875 break;
1876
1877 case IB_CM_REJ_RECEIVED:
7aa54bd7 1878 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1879 comp = 1;
1880
1881 srp_cm_rej_handler(cm_id, event, target);
1882 break;
1883
b7ac4ab4 1884 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1885 shost_printk(KERN_WARNING, target->scsi_host,
1886 PFX "DREQ received - connection closed\n");
294c875a 1887 srp_change_conn_state(target, false);
b7ac4ab4 1888 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1889 shost_printk(KERN_ERR, target->scsi_host,
1890 PFX "Sending CM DREP failed\n");
c1120f89 1891 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 1892 break;
1893
1894 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1895 shost_printk(KERN_ERR, target->scsi_host,
1896 PFX "connection closed\n");
ac72d766 1897 comp = 1;
aef9ec39 1898
aef9ec39
RD		 1899 target->status = 0;
1900 break;
1901
b7ac4ab4
IR		 1902 case IB_CM_MRA_RECEIVED:
1903 case IB_CM_DREQ_ERROR:
1904 case IB_CM_DREP_RECEIVED:
1905 break;
1906
aef9ec39 1907 default:
7aa54bd7
DD		 1908 shost_printk(KERN_WARNING, target->scsi_host,
1909 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1910 break;
1911 }
1912
1913 if (comp)
1914 complete(&target->done);
1915
aef9ec39
RD		 1916 return 0;
1917}
1918
71444b97
JW		 1919/**
1920 * srp_change_queue_type - changing device queue tag type
1921 * @sdev: scsi device struct
1922 * @tag_type: requested tag type
1923 *
1924 * Returns queue tag type.
1925 */
1926static int
1927srp_change_queue_type(struct scsi_device *sdev, int tag_type)
1928{
1929 if (sdev->tagged_supported) {
1930 scsi_set_tag_type(sdev, tag_type);
1931 if (tag_type)
1932 scsi_activate_tcq(sdev, sdev->queue_depth);
1933 else
1934 scsi_deactivate_tcq(sdev, sdev->queue_depth);
1935 } else
1936 tag_type = 0;
1937
1938 return tag_type;
1939}
1940
1941/**
1942 * srp_change_queue_depth - setting device queue depth
1943 * @sdev: scsi device struct
1944 * @qdepth: requested queue depth
1945 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
1946 * (see include/scsi/scsi_host.h for definition)
1947 *
1948 * Returns queue depth.
1949 */
1950static int
1951srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
1952{
1953 struct Scsi_Host *shost = sdev->host;
1954 int max_depth;
1955 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
1956 max_depth = shost->can_queue;
1957 if (!sdev->tagged_supported)
1958 max_depth = 1;
1959 if (qdepth > max_depth)
1960 qdepth = max_depth;
1961 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
1962 } else if (reason == SCSI_QDEPTH_QFULL)
1963 scsi_track_queue_full(sdev, qdepth);
1964 else
1965 return -EOPNOTSUPP;
1966
1967 return sdev->queue_depth;
1968}
1969
d945e1df 1970static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 1971 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 1972{
a95cadb9 1973 struct srp_rport *rport = target->rport;
19081f31 1974 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 1975 struct srp_iu *iu;
1976 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 1977
3780d1f0
BVA		 1978 if (!target->connected || target->qp_in_error)
1979 return -1;
1980
f8b6e31e 1981 init_completion(&target->tsk_mgmt_done);
aef9ec39 1982
a95cadb9
BVA		 1983 /*
1984 * Lock the rport mutex to avoid that srp_create_target_ib() is
1985 * invoked while a task management function is being sent.
1986 */
1987 mutex_lock(&rport->mutex);
e9684678 1988 spin_lock_irq(&target->lock);
bb12588a 1989 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 1990 spin_unlock_irq(&target->lock);
76c75b25 1991
a95cadb9
BVA		 1992 if (!iu) {
1993 mutex_unlock(&rport->mutex);
1994
76c75b25 1995 return -1;
a95cadb9 1996 }
aef9ec39 1997
19081f31
DD		 1998 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1999 DMA_TO_DEVICE);
aef9ec39
RD		 2000 tsk_mgmt = iu->buf;
2001 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2002
2003 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 2004 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
2005 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 2006 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 2007 tsk_mgmt->task_tag = req_tag;
aef9ec39 2008
19081f31
DD		 2009 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2010 DMA_TO_DEVICE);
76c75b25
BVA		 2011 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
2012 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 2013 mutex_unlock(&rport->mutex);
2014
76c75b25
BVA		 2015 return -1;
2016 }
a95cadb9 2017 mutex_unlock(&rport->mutex);
d945e1df 2018
f8b6e31e 2019 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 2020 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 2021 return -1;
aef9ec39 2022
d945e1df 2023 return 0;
d945e1df
RD		 2024}
2025
aef9ec39
RD		 2026static int srp_abort(struct scsi_cmnd *scmnd)
2027{
d945e1df 2028 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 2029 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
086f44f5 2030 int ret;
d945e1df 2031
7aa54bd7 2032 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 2033
b3fe628d 2034 if (!req || !srp_claim_req(target, req, NULL, scmnd))
99b6697a 2035 return SUCCESS;
086f44f5 2036 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
80d5e8a2 2037 SRP_TSK_ABORT_TASK) == 0)
086f44f5 2038 ret = SUCCESS;
ed9b2264 2039 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 2040 ret = FAST_IO_FAIL;
086f44f5
BVA		 2041 else
2042 ret = FAILED;
22032991
BVA		 2043 srp_free_req(target, req, scmnd, 0);
2044 scmnd->result = DID_ABORT << 16;
d8536670 2045 scmnd->scsi_done(scmnd);
d945e1df 2046
086f44f5 2047 return ret;
aef9ec39
RD		 2048}
2049
2050static int srp_reset_device(struct scsi_cmnd *scmnd)
2051{
d945e1df 2052 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 2053 int i;
d945e1df 2054
7aa54bd7 2055 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 2056
f8b6e31e
DD		 2057 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2058 SRP_TSK_LUN_RESET))
d945e1df 2059 return FAILED;
f8b6e31e 2060 if (target->tsk_mgmt_status)
d945e1df
RD		 2061 return FAILED;
2062
4d73f95f 2063 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 2064 struct srp_request *req = &target->req_ring[i];
b3fe628d 2065 srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
536ae14e 2066 }
d945e1df 2067
d945e1df 2068 return SUCCESS;
aef9ec39
RD		 2069}
2070
2071static int srp_reset_host(struct scsi_cmnd *scmnd)
2072{
2073 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 2074
7aa54bd7 2075 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 2076
ed9b2264 2077 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 2078}
2079
c9b03c1a
BVA		 2080static int srp_slave_configure(struct scsi_device *sdev)
2081{
2082 struct Scsi_Host *shost = sdev->host;
2083 struct srp_target_port *target = host_to_target(shost);
2084 struct request_queue *q = sdev->request_queue;
2085 unsigned long timeout;
2086
2087 if (sdev->type == TYPE_DISK) {
2088 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2089 blk_queue_rq_timeout(q, timeout);
2090 }
2091
2092 return 0;
2093}
2094
ee959b00
TJ		 2095static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2096 char *buf)
6ecb0c84 2097{
ee959b00 2098 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2099
6ecb0c84
RD		 2100 return sprintf(buf, "0x%016llx\n",
2101 (unsigned long long) be64_to_cpu(target->id_ext));
2102}
2103
ee959b00
TJ		 2104static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2105 char *buf)
6ecb0c84 2106{
ee959b00 2107 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2108
6ecb0c84
RD		 2109 return sprintf(buf, "0x%016llx\n",
2110 (unsigned long long) be64_to_cpu(target->ioc_guid));
2111}
2112
ee959b00
TJ		 2113static ssize_t show_service_id(struct device *dev,
2114 struct device_attribute *attr, char *buf)
6ecb0c84 2115{
ee959b00 2116 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2117
6ecb0c84
RD		 2118 return sprintf(buf, "0x%016llx\n",
2119 (unsigned long long) be64_to_cpu(target->service_id));
2120}
2121
ee959b00
TJ		 2122static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2123 char *buf)
6ecb0c84 2124{
ee959b00 2125 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2126
6ecb0c84
RD		 2127 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2128}
2129
848b3082
BVA		 2130static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2131 char *buf)
2132{
2133 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2134
2135 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2136}
2137
ee959b00
TJ		 2138static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2139 char *buf)
6ecb0c84 2140{
ee959b00 2141 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2142
5b095d98 2143 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 2144}
2145
ee959b00
TJ		 2146static ssize_t show_orig_dgid(struct device *dev,
2147 struct device_attribute *attr, char *buf)
3633b3d0 2148{
ee959b00 2149 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 2150
5b095d98 2151 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 2152}
2153
89de7486
BVA		 2154static ssize_t show_req_lim(struct device *dev,
2155 struct device_attribute *attr, char *buf)
2156{
2157 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2158
89de7486
BVA		 2159 return sprintf(buf, "%d\n", target->req_lim);
2160}
2161
ee959b00
TJ		 2162static ssize_t show_zero_req_lim(struct device *dev,
2163 struct device_attribute *attr, char *buf)
6bfa24fa 2164{
ee959b00 2165 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 2166
6bfa24fa
RD		 2167 return sprintf(buf, "%d\n", target->zero_req_lim);
2168}
2169
ee959b00
TJ		 2170static ssize_t show_local_ib_port(struct device *dev,
2171 struct device_attribute *attr, char *buf)
ded7f1a1 2172{
ee959b00 2173 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2174
2175 return sprintf(buf, "%d\n", target->srp_host->port);
2176}
2177
ee959b00
TJ		 2178static ssize_t show_local_ib_device(struct device *dev,
2179 struct device_attribute *attr, char *buf)
ded7f1a1 2180{
ee959b00 2181 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2182
05321937 2183 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2184}
2185
4b5e5f41
BVA		 2186static ssize_t show_comp_vector(struct device *dev,
2187 struct device_attribute *attr, char *buf)
2188{
2189 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2190
2191 return sprintf(buf, "%d\n", target->comp_vector);
2192}
2193
7bb312e4
VP		 2194static ssize_t show_tl_retry_count(struct device *dev,
2195 struct device_attribute *attr, char *buf)
2196{
2197 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2198
2199 return sprintf(buf, "%d\n", target->tl_retry_count);
2200}
2201
49248644
DD		 2202static ssize_t show_cmd_sg_entries(struct device *dev,
2203 struct device_attribute *attr, char *buf)
2204{
2205 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2206
2207 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2208}
2209
c07d424d
DD		 2210static ssize_t show_allow_ext_sg(struct device *dev,
2211 struct device_attribute *attr, char *buf)
2212{
2213 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2214
2215 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2216}
2217
ee959b00
TJ		 2218static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2219static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2220static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2221static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
848b3082 2222static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
ee959b00
TJ		 2223static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2224static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2225static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2226static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2227static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2228static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2229static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2230static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2231static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2232static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2233
2234static struct device_attribute *srp_host_attrs[] = {
2235 &dev_attr_id_ext,
2236 &dev_attr_ioc_guid,
2237 &dev_attr_service_id,
2238 &dev_attr_pkey,
848b3082 2239 &dev_attr_sgid,
ee959b00
TJ		 2240 &dev_attr_dgid,
2241 &dev_attr_orig_dgid,
89de7486 2242 &dev_attr_req_lim,
ee959b00
TJ		 2243 &dev_attr_zero_req_lim,
2244 &dev_attr_local_ib_port,
2245 &dev_attr_local_ib_device,
4b5e5f41 2246 &dev_attr_comp_vector,
7bb312e4 2247 &dev_attr_tl_retry_count,
49248644 2248 &dev_attr_cmd_sg_entries,
c07d424d 2249 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2250 NULL
2251};
2252
aef9ec39
RD		 2253static struct scsi_host_template srp_template = {
2254 .module = THIS_MODULE,
b7f008fd
RD		 2255 .name = "InfiniBand SRP initiator",
2256 .proc_name = DRV_NAME,
c9b03c1a 2257 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2258 .info = srp_target_info,
2259 .queuecommand = srp_queuecommand,
71444b97
JW		 2260 .change_queue_depth = srp_change_queue_depth,
2261 .change_queue_type = srp_change_queue_type,
aef9ec39
RD		 2262 .eh_abort_handler = srp_abort,
2263 .eh_device_reset_handler = srp_reset_device,
2264 .eh_host_reset_handler = srp_reset_host,
2742c1da 2265 .skip_settle_delay = true,
49248644 2266 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
4d73f95f 2267 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
aef9ec39 2268 .this_id = -1,
4d73f95f 2269 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
6ecb0c84
RD		 2270 .use_clustering = ENABLE_CLUSTERING,
2271 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2272};
2273
2274static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2275{
3236822b
FT		 2276 struct srp_rport_identifiers ids;
2277 struct srp_rport *rport;
2278
aef9ec39
RD		 2279 sprintf(target->target_name, "SRP.T10:%016llX",
2280 (unsigned long long) be64_to_cpu(target->id_ext));
2281
05321937 2282 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2283 return -ENODEV;
2284
3236822b
FT		 2285 memcpy(ids.port_id, &target->id_ext, 8);
2286 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2287 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2288 rport = srp_rport_add(target->scsi_host, &ids);
2289 if (IS_ERR(rport)) {
2290 scsi_remove_host(target->scsi_host);
2291 return PTR_ERR(rport);
2292 }
2293
dc1bdbd9 2294 rport->lld_data = target;
9dd69a60 2295 target->rport = rport;
dc1bdbd9 2296
b3589fd4 2297 spin_lock(&host->target_lock);
aef9ec39 2298 list_add_tail(&target->list, &host->target_list);
b3589fd4 2299 spin_unlock(&host->target_lock);
aef9ec39
RD		 2300
2301 target->state = SRP_TARGET_LIVE;
2302
aef9ec39 2303 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2304 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 2305
2306 return 0;
2307}
2308
ee959b00 2309static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2310{
2311 struct srp_host *host =
ee959b00 2312 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2313
2314 complete(&host->released);
2315}
2316
2317static struct class srp_class = {
2318 .name = "infiniband_srp",
ee959b00 2319 .dev_release = srp_release_dev
aef9ec39
RD		 2320};
2321
96fc248a
BVA		 2322/**
2323 * srp_conn_unique() - check whether the connection to a target is unique
af24663b
BVA		 2324 * @host: SRP host.
2325 * @target: SRP target port.
96fc248a
BVA		 2326 */
2327static bool srp_conn_unique(struct srp_host *host,
2328 struct srp_target_port *target)
2329{
2330 struct srp_target_port *t;
2331 bool ret = false;
2332
2333 if (target->state == SRP_TARGET_REMOVED)
2334 goto out;
2335
2336 ret = true;
2337
2338 spin_lock(&host->target_lock);
2339 list_for_each_entry(t, &host->target_list, list) {
2340 if (t != target &&
2341 target->id_ext == t->id_ext &&
2342 target->ioc_guid == t->ioc_guid &&
2343 target->initiator_ext == t->initiator_ext) {
2344 ret = false;
2345 break;
2346 }
2347 }
2348 spin_unlock(&host->target_lock);
2349
2350out:
2351 return ret;
2352}
2353
aef9ec39
RD		 2354/*
2355 * Target ports are added by writing
2356 *
2357 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2358 * pkey=<P_Key>,service_id=<service ID>
2359 *
2360 * to the add_target sysfs attribute.
2361 */
2362enum {
2363 SRP_OPT_ERR = 0,
2364 SRP_OPT_ID_EXT = 1 << 0,
2365 SRP_OPT_IOC_GUID = 1 << 1,
2366 SRP_OPT_DGID = 1 << 2,
2367 SRP_OPT_PKEY = 1 << 3,
2368 SRP_OPT_SERVICE_ID = 1 << 4,
2369 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2370 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2371 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2372 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2373 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2374 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2375 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2376 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2377 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
4d73f95f 2378 SRP_OPT_QUEUE_SIZE = 1 << 14,
aef9ec39
RD		 2379 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2380 SRP_OPT_IOC_GUID |
2381 SRP_OPT_DGID |
2382 SRP_OPT_PKEY |
2383 SRP_OPT_SERVICE_ID),
2384};
2385
a447c093 2386static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2387 { SRP_OPT_ID_EXT, "id_ext=%s" },
2388 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2389 { SRP_OPT_DGID, "dgid=%s" },
2390 { SRP_OPT_PKEY, "pkey=%x" },
2391 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2392 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2393 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2394 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2395 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2396 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2397 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2398 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2399 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2400 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
4d73f95f 2401 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
52fb2b50 2402 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2403};
2404
2405static int srp_parse_options(const char *buf, struct srp_target_port *target)
2406{
2407 char *options, *sep_opt;
2408 char *p;
2409 char dgid[3];
2410 substring_t args[MAX_OPT_ARGS];
2411 int opt_mask = 0;
2412 int token;
2413 int ret = -EINVAL;
2414 int i;
2415
2416 options = kstrdup(buf, GFP_KERNEL);
2417 if (!options)
2418 return -ENOMEM;
2419
2420 sep_opt = options;
2421 while ((p = strsep(&sep_opt, ",")) != NULL) {
2422 if (!*p)
2423 continue;
2424
2425 token = match_token(p, srp_opt_tokens, args);
2426 opt_mask |= token;
2427
2428 switch (token) {
2429 case SRP_OPT_ID_EXT:
2430 p = match_strdup(args);
a20f3a6d
IR		 2431 if (!p) {
2432 ret = -ENOMEM;
2433 goto out;
2434 }
aef9ec39
RD		 2435 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2436 kfree(p);
2437 break;
2438
2439 case SRP_OPT_IOC_GUID:
2440 p = match_strdup(args);
a20f3a6d
IR		 2441 if (!p) {
2442 ret = -ENOMEM;
2443 goto out;
2444 }
aef9ec39
RD		 2445 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2446 kfree(p);
2447 break;
2448
2449 case SRP_OPT_DGID:
2450 p = match_strdup(args);
a20f3a6d
IR		 2451 if (!p) {
2452 ret = -ENOMEM;
2453 goto out;
2454 }
aef9ec39 2455 if (strlen(p) != 32) {
e0bda7d8 2456 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2457 kfree(p);
aef9ec39
RD		 2458 goto out;
2459 }
2460
2461 for (i = 0; i < 16; ++i) {
2462 strlcpy(dgid, p + i * 2, 3);
2463 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2464 }
bf17c1c7 2465 kfree(p);
3633b3d0 2466 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2467 break;
2468
2469 case SRP_OPT_PKEY:
2470 if (match_hex(args, &token)) {
e0bda7d8 2471 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2472 goto out;
2473 }
2474 target->path.pkey = cpu_to_be16(token);
2475 break;
2476
2477 case SRP_OPT_SERVICE_ID:
2478 p = match_strdup(args);
a20f3a6d
IR		 2479 if (!p) {
2480 ret = -ENOMEM;
2481 goto out;
2482 }
aef9ec39 2483 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2484 target->path.service_id = target->service_id;
aef9ec39
RD		 2485 kfree(p);
2486 break;
2487
2488 case SRP_OPT_MAX_SECT:
2489 if (match_int(args, &token)) {
e0bda7d8 2490 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2491 goto out;
2492 }
2493 target->scsi_host->max_sectors = token;
2494 break;
2495
4d73f95f
BVA		 2496 case SRP_OPT_QUEUE_SIZE:
2497 if (match_int(args, &token) || token < 1) {
2498 pr_warn("bad queue_size parameter '%s'\n", p);
2499 goto out;
2500 }
2501 target->scsi_host->can_queue = token;
2502 target->queue_size = token + SRP_RSP_SQ_SIZE +
2503 SRP_TSK_MGMT_SQ_SIZE;
2504 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2505 target->scsi_host->cmd_per_lun = token;
2506 break;
2507
52fb2b50 2508 case SRP_OPT_MAX_CMD_PER_LUN:
4d73f95f 2509 if (match_int(args, &token) || token < 1) {
e0bda7d8
BVA		 2510 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2511 p);
52fb2b50
VP		 2512 goto out;
2513 }
4d73f95f 2514 target->scsi_host->cmd_per_lun = token;
52fb2b50
VP		 2515 break;
2516
0c0450db
R		 2517 case SRP_OPT_IO_CLASS:
2518 if (match_hex(args, &token)) {
e0bda7d8 2519 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2520 goto out;
2521 }
2522 if (token != SRP_REV10_IB_IO_CLASS &&
2523 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2524 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2525 token, SRP_REV10_IB_IO_CLASS,
2526 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2527 goto out;
2528 }
2529 target->io_class = token;
2530 break;
2531
01cb9bcb
IR		 2532 case SRP_OPT_INITIATOR_EXT:
2533 p = match_strdup(args);
a20f3a6d
IR		 2534 if (!p) {
2535 ret = -ENOMEM;
2536 goto out;
2537 }
01cb9bcb
IR		 2538 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2539 kfree(p);
2540 break;
2541
49248644
DD		 2542 case SRP_OPT_CMD_SG_ENTRIES:
2543 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2544 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2545 p);
49248644
DD		 2546 goto out;
2547 }
2548 target->cmd_sg_cnt = token;
2549 break;
2550
c07d424d
DD		 2551 case SRP_OPT_ALLOW_EXT_SG:
2552 if (match_int(args, &token)) {
e0bda7d8 2553 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2554 goto out;
2555 }
2556 target->allow_ext_sg = !!token;
2557 break;
2558
2559 case SRP_OPT_SG_TABLESIZE:
2560 if (match_int(args, &token) || token < 1 ||
2561 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2562 pr_warn("bad max sg_tablesize parameter '%s'\n",
2563 p);
c07d424d
DD		 2564 goto out;
2565 }
2566 target->sg_tablesize = token;
2567 break;
2568
4b5e5f41
BVA		 2569 case SRP_OPT_COMP_VECTOR:
2570 if (match_int(args, &token) || token < 0) {
2571 pr_warn("bad comp_vector parameter '%s'\n", p);
2572 goto out;
2573 }
2574 target->comp_vector = token;
2575 break;
2576
7bb312e4
VP		 2577 case SRP_OPT_TL_RETRY_COUNT:
2578 if (match_int(args, &token) || token < 2 || token > 7) {
2579 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2580 p);
2581 goto out;
2582 }
2583 target->tl_retry_count = token;
2584 break;
2585
aef9ec39 2586 default:
e0bda7d8
BVA		 2587 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2588 p);
aef9ec39
RD		 2589 goto out;
2590 }
2591 }
2592
2593 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2594 ret = 0;
2595 else
2596 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2597 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2598 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2599 pr_warn("target creation request is missing parameter '%s'\n",
2600 srp_opt_tokens[i].pattern);
aef9ec39 2601
4d73f95f
BVA		 2602 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2603 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2604 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2605 target->scsi_host->cmd_per_lun,
2606 target->scsi_host->can_queue);
2607
aef9ec39
RD		 2608out:
2609 kfree(options);
2610 return ret;
2611}
2612
ee959b00
TJ		 2613static ssize_t srp_create_target(struct device *dev,
2614 struct device_attribute *attr,
aef9ec39
RD		 2615 const char *buf, size_t count)
2616{
2617 struct srp_host *host =
ee959b00 2618 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2619 struct Scsi_Host *target_host;
2620 struct srp_target_port *target;
c07d424d 2621 struct ib_device *ibdev = host->srp_dev->dev;
b81d00bd 2622 int ret;
aef9ec39
RD		 2623
2624 target_host = scsi_host_alloc(&srp_template,
2625 sizeof (struct srp_target_port));
2626 if (!target_host)
2627 return -ENOMEM;
2628
49248644 2629 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2630 target_host->max_channel = 0;
2631 target_host->max_id = 1;
3c8edf0e
AR		 2632 target_host->max_lun = SRP_MAX_LUN;
2633 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2634
aef9ec39 2635 target = host_to_target(target_host);
aef9ec39 2636
49248644
DD		 2637 target->io_class = SRP_REV16A_IB_IO_CLASS;
2638 target->scsi_host = target_host;
2639 target->srp_host = host;
2640 target->lkey = host->srp_dev->mr->lkey;
2641 target->rkey = host->srp_dev->mr->rkey;
2642 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2643 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2644 target->allow_ext_sg = allow_ext_sg;
7bb312e4 2645 target->tl_retry_count = 7;
4d73f95f 2646 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
aef9ec39 2647
2d7091bc
BVA		 2648 mutex_lock(&host->add_target_mutex);
2649
aef9ec39
RD		 2650 ret = srp_parse_options(buf, target);
2651 if (ret)
2652 goto err;
2653
4d73f95f
BVA		 2654 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2655
96fc248a
BVA		 2656 if (!srp_conn_unique(target->srp_host, target)) {
2657 shost_printk(KERN_INFO, target->scsi_host,
2658 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2659 be64_to_cpu(target->id_ext),
2660 be64_to_cpu(target->ioc_guid),
2661 be64_to_cpu(target->initiator_ext));
2662 ret = -EEXIST;
2663 goto err;
2664 }
2665
c07d424d
DD		 2666 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2667 target->cmd_sg_cnt < target->sg_tablesize) {
e0bda7d8 2668 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 2669 target->sg_tablesize = target->cmd_sg_cnt;
2670 }
2671
2672 target_host->sg_tablesize = target->sg_tablesize;
2673 target->indirect_size = target->sg_tablesize *
2674 sizeof (struct srp_direct_buf);
49248644
DD		 2675 target->max_iu_len = sizeof (struct srp_cmd) +
2676 sizeof (struct srp_indirect_buf) +
2677 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2678
c1120f89 2679 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 2680 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 2681 spin_lock_init(&target->lock);
2682 INIT_LIST_HEAD(&target->free_tx);
b81d00bd
BVA		 2683 ret = srp_alloc_req_data(target);
2684 if (ret)
2685 goto err_free_mem;
8f26c9ff 2686
2088ca66
SG		 2687 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2688 if (ret)
2689 goto err_free_mem;
aef9ec39 2690
aef9ec39
RD		 2691 ret = srp_create_target_ib(target);
2692 if (ret)
8f26c9ff 2693 goto err_free_mem;
aef9ec39 2694
9fe4bcf4
DD		 2695 ret = srp_new_cm_id(target);
2696 if (ret)
8f26c9ff 2697 goto err_free_ib;
aef9ec39
RD		 2698
2699 ret = srp_connect_target(target);
2700 if (ret) {
7aa54bd7
DD		 2701 shost_printk(KERN_ERR, target->scsi_host,
2702 PFX "Connection failed\n");
aef9ec39
RD		 2703 goto err_cm_id;
2704 }
2705
2706 ret = srp_add_target(host, target);
2707 if (ret)
2708 goto err_disconnect;
2709
e7ffde01
BVA		 2710 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2711 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
2712 be64_to_cpu(target->id_ext),
2713 be64_to_cpu(target->ioc_guid),
2714 be16_to_cpu(target->path.pkey),
2715 be64_to_cpu(target->service_id),
2716 target->path.sgid.raw, target->path.dgid.raw);
2717
2d7091bc
BVA		 2718 ret = count;
2719
2720out:
2721 mutex_unlock(&host->add_target_mutex);
2722 return ret;
aef9ec39
RD		 2723
2724err_disconnect:
2725 srp_disconnect_target(target);
2726
2727err_cm_id:
2728 ib_destroy_cm_id(target->cm_id);
2729
8f26c9ff 2730err_free_ib:
aef9ec39
RD		 2731 srp_free_target_ib(target);
2732
8f26c9ff
DD		 2733err_free_mem:
2734 srp_free_req_data(target);
2735
aef9ec39
RD		 2736err:
2737 scsi_host_put(target_host);
2d7091bc 2738 goto out;
aef9ec39
RD		 2739}
2740
ee959b00 2741static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2742
ee959b00
TJ		 2743static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2744 char *buf)
aef9ec39 2745{
ee959b00 2746 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2747
05321937 2748 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2749}
2750
ee959b00 2751static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2752
ee959b00
TJ		 2753static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2754 char *buf)
aef9ec39 2755{
ee959b00 2756 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2757
2758 return sprintf(buf, "%d\n", host->port);
2759}
2760
ee959b00 2761static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2762
f5358a17 2763static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2764{
2765 struct srp_host *host;
2766
2767 host = kzalloc(sizeof *host, GFP_KERNEL);
2768 if (!host)
2769 return NULL;
2770
2771 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2772 spin_lock_init(&host->target_lock);
aef9ec39 2773 init_completion(&host->released);
2d7091bc 2774 mutex_init(&host->add_target_mutex);
05321937 2775 host->srp_dev = device;
aef9ec39
RD		 2776 host->port = port;
2777
ee959b00
TJ		 2778 host->dev.class = &srp_class;
2779 host->dev.parent = device->dev->dma_device;
d927e38c 2780 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2781
ee959b00 2782 if (device_register(&host->dev))
f5358a17 2783 goto free_host;
ee959b00 2784 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2785 goto err_class;
ee959b00 2786 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2787 goto err_class;
ee959b00 2788 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2789 goto err_class;
2790
2791 return host;
2792
2793err_class:
ee959b00 2794 device_unregister(&host->dev);
aef9ec39 2795
f5358a17 2796free_host:
aef9ec39
RD		 2797 kfree(host);
2798
2799 return NULL;
2800}
2801
2802static void srp_add_one(struct ib_device *device)
2803{
f5358a17
RD		 2804 struct srp_device *srp_dev;
2805 struct ib_device_attr *dev_attr;
2806 struct ib_fmr_pool_param fmr_param;
aef9ec39 2807 struct srp_host *host;
be8b9814 2808 int max_pages_per_fmr, fmr_page_shift, s, e, p;
aef9ec39 2809
f5358a17
RD		 2810 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2811 if (!dev_attr)
cf311cd4 2812 return;
aef9ec39 2813
f5358a17 2814 if (ib_query_device(device, dev_attr)) {
e0bda7d8 2815 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 2816 goto free_attr;
2817 }
2818
2819 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2820 if (!srp_dev)
2821 goto free_attr;
2822
2823 /*
2824 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 2825 * minimum of 4096 bytes. We're unlikely to build large sglists
2826 * out of smaller entries.
f5358a17 2827 */
8f26c9ff
DD		 2828 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2829 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2830 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2831 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
f5358a17
RD		 2832
2833 INIT_LIST_HEAD(&srp_dev->dev_list);
2834
2835 srp_dev->dev = device;
2836 srp_dev->pd = ib_alloc_pd(device);
2837 if (IS_ERR(srp_dev->pd))
2838 goto free_dev;
2839
2840 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2841 IB_ACCESS_LOCAL_WRITE |
2842 IB_ACCESS_REMOTE_READ |
2843 IB_ACCESS_REMOTE_WRITE);
2844 if (IS_ERR(srp_dev->mr))
2845 goto err_pd;
2846
be8b9814
DD		 2847 for (max_pages_per_fmr = SRP_FMR_SIZE;
2848 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2849 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2850 memset(&fmr_param, 0, sizeof fmr_param);
2851 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2852 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2853 fmr_param.cache = 1;
2854 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2855 fmr_param.page_shift = fmr_page_shift;
2856 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2857 IB_ACCESS_REMOTE_WRITE |
2858 IB_ACCESS_REMOTE_READ);
2859
2860 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2861 if (!IS_ERR(srp_dev->fmr_pool))
2862 break;
2863 }
2864
f5358a17
RD		 2865 if (IS_ERR(srp_dev->fmr_pool))
2866 srp_dev->fmr_pool = NULL;
aef9ec39 2867
07ebafba 2868 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2869 s = 0;
2870 e = 0;
2871 } else {
2872 s = 1;
2873 e = device->phys_port_cnt;
2874 }
2875
2876 for (p = s; p <= e; ++p) {
f5358a17 2877 host = srp_add_port(srp_dev, p);
aef9ec39 2878 if (host)
f5358a17 2879 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2880 }
2881
f5358a17
RD		 2882 ib_set_client_data(device, &srp_client, srp_dev);
2883
2884 goto free_attr;
2885
2886err_pd:
2887 ib_dealloc_pd(srp_dev->pd);
2888
2889free_dev:
2890 kfree(srp_dev);
2891
2892free_attr:
2893 kfree(dev_attr);
aef9ec39
RD		 2894}
2895
2896static void srp_remove_one(struct ib_device *device)
2897{
f5358a17 2898 struct srp_device *srp_dev;
aef9ec39 2899 struct srp_host *host, *tmp_host;
ef6c49d8 2900 struct srp_target_port *target;
aef9ec39 2901
f5358a17 2902 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 2903 if (!srp_dev)
2904 return;
aef9ec39 2905
f5358a17 2906 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2907 device_unregister(&host->dev);
aef9ec39
RD		 2908 /*
2909 * Wait for the sysfs entry to go away, so that no new
2910 * target ports can be created.
2911 */
2912 wait_for_completion(&host->released);
2913
2914 /*
ef6c49d8 2915 * Remove all target ports.
aef9ec39 2916 */
b3589fd4 2917 spin_lock(&host->target_lock);
ef6c49d8
BVA		 2918 list_for_each_entry(target, &host->target_list, list)
2919 srp_queue_remove_work(target);
b3589fd4 2920 spin_unlock(&host->target_lock);
aef9ec39
RD		 2921
2922 /*
ef6c49d8 2923 * Wait for target port removal tasks.
aef9ec39 2924 */
ef6c49d8 2925 flush_workqueue(system_long_wq);
aef9ec39 2926
aef9ec39
RD		 2927 kfree(host);
2928 }
2929
f5358a17
RD		 2930 if (srp_dev->fmr_pool)
2931 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2932 ib_dereg_mr(srp_dev->mr);
2933 ib_dealloc_pd(srp_dev->pd);
2934
2935 kfree(srp_dev);
aef9ec39
RD		 2936}
2937
3236822b 2938static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 2939 .has_rport_state = true,
2940 .reset_timer_if_blocked = true,
a95cadb9 2941 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 2942 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
2943 .dev_loss_tmo = &srp_dev_loss_tmo,
2944 .reconnect = srp_rport_reconnect,
dc1bdbd9 2945 .rport_delete = srp_rport_delete,
ed9b2264 2946 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 2947};
2948
aef9ec39
RD		 2949static int __init srp_init_module(void)
2950{
2951 int ret;
2952
dcb4cb85 2953 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 2954
49248644 2955 if (srp_sg_tablesize) {
e0bda7d8 2956 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 2957 if (!cmd_sg_entries)
2958 cmd_sg_entries = srp_sg_tablesize;
2959 }
2960
2961 if (!cmd_sg_entries)
2962 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2963
2964 if (cmd_sg_entries > 255) {
e0bda7d8 2965 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 2966 cmd_sg_entries = 255;
1e89a194
DD		 2967 }
2968
c07d424d
DD		 2969 if (!indirect_sg_entries)
2970 indirect_sg_entries = cmd_sg_entries;
2971 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 2972 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2973 cmd_sg_entries);
c07d424d
DD		 2974 indirect_sg_entries = cmd_sg_entries;
2975 }
2976
3236822b
FT		 2977 ib_srp_transport_template =
2978 srp_attach_transport(&ib_srp_transport_functions);
2979 if (!ib_srp_transport_template)
2980 return -ENOMEM;
2981
aef9ec39
RD		 2982 ret = class_register(&srp_class);
2983 if (ret) {
e0bda7d8 2984 pr_err("couldn't register class infiniband_srp\n");
3236822b 2985 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2986 return ret;
2987 }
2988
c1a0b23b
MT		 2989 ib_sa_register_client(&srp_sa_client);
2990
aef9ec39
RD		 2991 ret = ib_register_client(&srp_client);
2992 if (ret) {
e0bda7d8 2993 pr_err("couldn't register IB client\n");
3236822b 2994 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2995 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2996 class_unregister(&srp_class);
2997 return ret;
2998 }
2999
3000 return 0;
3001}
3002
3003static void __exit srp_cleanup_module(void)
3004{
3005 ib_unregister_client(&srp_client);
c1a0b23b 3006 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 3007 class_unregister(&srp_class);
3236822b 3008 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 3009}
3010
3011module_init(srp_init_module);
3012module_exit(srp_cleanup_module);
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