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IB/srp: Make writing into the "add_target" sysfs attribute interruptible
[people/ms/linux.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
aef9ec39
RD		 31 */
32
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.
786 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
787 * ownership of @req->scmnd if it equals @scmnd.
788 *
789 * Return value:
790 * Either NULL or a pointer to the SCSI command the caller became owner of.
791 */
792static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
793 struct srp_request *req,
794 struct scsi_cmnd *scmnd)
795{
796 unsigned long flags;
797
798 spin_lock_irqsave(&target->lock, flags);
799 if (!scmnd) {
800 scmnd = req->scmnd;
801 req->scmnd = NULL;
802 } else if (req->scmnd == scmnd) {
803 req->scmnd = NULL;
804 } else {
805 scmnd = NULL;
806 }
807 spin_unlock_irqrestore(&target->lock, flags);
808
809 return scmnd;
810}
811
812/**
813 * srp_free_req() - Unmap data and add request to the free request list.
814 */
815static void srp_free_req(struct srp_target_port *target,
816 struct srp_request *req, struct scsi_cmnd *scmnd,
817 s32 req_lim_delta)
526b4caa 818{
94a9174c
BVA		 819 unsigned long flags;
820
22032991
BVA		 821 srp_unmap_data(scmnd, target, req);
822
e9684678 823 spin_lock_irqsave(&target->lock, flags);
94a9174c 824 target->req_lim += req_lim_delta;
536ae14e 825 list_add_tail(&req->list, &target->free_reqs);
e9684678 826 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 827}
828
ed9b2264
BVA		 829static void srp_finish_req(struct srp_target_port *target,
830 struct srp_request *req, int result)
526b4caa 831{
22032991
BVA		 832 struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
833
834 if (scmnd) {
9b796d06 835 srp_free_req(target, req, scmnd, 0);
ed9b2264 836 scmnd->result = result;
22032991 837 scmnd->scsi_done(scmnd);
22032991 838 }
526b4caa
IR		 839}
840
ed9b2264 841static void srp_terminate_io(struct srp_rport *rport)
aef9ec39 842{
ed9b2264
BVA		 843 struct srp_target_port *target = rport->lld_data;
844 int i;
845
4d73f95f 846 for (i = 0; i < target->req_ring_size; ++i) {
ed9b2264
BVA		 847 struct srp_request *req = &target->req_ring[i];
848 srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16);
849 }
850}
aef9ec39 851
ed9b2264
BVA		 852/*
853 * It is up to the caller to ensure that srp_rport_reconnect() calls are
854 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
855 * srp_reset_device() or srp_reset_host() calls will occur while this function
856 * is in progress. One way to realize that is not to call this function
857 * directly but to call srp_reconnect_rport() instead since that last function
858 * serializes calls of this function via rport->mutex and also blocks
859 * srp_queuecommand() calls before invoking this function.
860 */
861static int srp_rport_reconnect(struct srp_rport *rport)
862{
863 struct srp_target_port *target = rport->lld_data;
864 int i, ret;
09be70a2 865
aef9ec39
RD		 866 srp_disconnect_target(target);
867 /*
c7c4e7ff
BVA		 868 * Now get a new local CM ID so that we avoid confusing the target in
869 * case things are really fouled up. Doing so also ensures that all CM
870 * callbacks will have finished before a new QP is allocated.
aef9ec39 871 */
9fe4bcf4 872 ret = srp_new_cm_id(target);
c7c4e7ff
BVA		 873 /*
874 * Whether or not creating a new CM ID succeeded, create a new
875 * QP. This guarantees that all completion callback function
876 * invocations have finished before request resetting starts.
877 */
878 if (ret == 0)
879 ret = srp_create_target_ib(target);
880 else
881 srp_create_target_ib(target);
aef9ec39 882
4d73f95f 883 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 884 struct srp_request *req = &target->req_ring[i];
ed9b2264 885 srp_finish_req(target, req, DID_RESET << 16);
536ae14e 886 }
aef9ec39 887
536ae14e 888 INIT_LIST_HEAD(&target->free_tx);
4d73f95f 889 for (i = 0; i < target->queue_size; ++i)
536ae14e 890 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 891
c7c4e7ff
BVA		 892 if (ret == 0)
893 ret = srp_connect_target(target);
09be70a2 894
ed9b2264
BVA		 895 if (ret == 0)
896 shost_printk(KERN_INFO, target->scsi_host,
897 PFX "reconnect succeeded\n");
aef9ec39
RD		 898
899 return ret;
900}
901
8f26c9ff
DD		 902static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
903 unsigned int dma_len, u32 rkey)
f5358a17 904{
8f26c9ff 905 struct srp_direct_buf *desc = state->desc;
f5358a17 906
8f26c9ff
DD		 907 desc->va = cpu_to_be64(dma_addr);
908 desc->key = cpu_to_be32(rkey);
909 desc->len = cpu_to_be32(dma_len);
f5358a17 910
8f26c9ff
DD		 911 state->total_len += dma_len;
912 state->desc++;
913 state->ndesc++;
914}
559ce8f1 915
8f26c9ff
DD		 916static int srp_map_finish_fmr(struct srp_map_state *state,
917 struct srp_target_port *target)
918{
919 struct srp_device *dev = target->srp_host->srp_dev;
920 struct ib_pool_fmr *fmr;
921 u64 io_addr = 0;
85507bcc 922
8f26c9ff
DD		 923 if (!state->npages)
924 return 0;
f5358a17 925
8f26c9ff
DD		 926 if (state->npages == 1) {
927 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
928 target->rkey);
929 state->npages = state->fmr_len = 0;
930 return 0;
f5358a17
RD		 931 }
932
8f26c9ff
DD		 933 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
934 state->npages, io_addr);
935 if (IS_ERR(fmr))
936 return PTR_ERR(fmr);
f5358a17 937
8f26c9ff
DD		 938 *state->next_fmr++ = fmr;
939 state->nfmr++;
f5358a17 940
8f26c9ff
DD		 941 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
942 state->npages = state->fmr_len = 0;
943 return 0;
944}
945
946static void srp_map_update_start(struct srp_map_state *state,
947 struct scatterlist *sg, int sg_index,
948 dma_addr_t dma_addr)
949{
950 state->unmapped_sg = sg;
951 state->unmapped_index = sg_index;
952 state->unmapped_addr = dma_addr;
953}
85507bcc 954
8f26c9ff
DD		 955static int srp_map_sg_entry(struct srp_map_state *state,
956 struct srp_target_port *target,
957 struct scatterlist *sg, int sg_index,
958 int use_fmr)
959{
960 struct srp_device *dev = target->srp_host->srp_dev;
961 struct ib_device *ibdev = dev->dev;
962 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
963 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
964 unsigned int len;
965 int ret;
966
967 if (!dma_len)
968 return 0;
969
970 if (use_fmr == SRP_MAP_NO_FMR) {
971 /* Once we're in direct map mode for a request, we don't
972 * go back to FMR mode, so no need to update anything
973 * other than the descriptor.
974 */
975 srp_map_desc(state, dma_addr, dma_len, target->rkey);
976 return 0;
85507bcc 977 }
f5358a17 978
8f26c9ff
DD		 979 /* If we start at an offset into the FMR page, don't merge into
980 * the current FMR. Finish it out, and use the kernel's MR for this
981 * sg entry. This is to avoid potential bugs on some SRP targets
982 * that were never quite defined, but went away when the initiator
983 * avoided using FMR on such page fragments.
984 */
985 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
986 ret = srp_map_finish_fmr(state, target);
987 if (ret)
988 return ret;
989
990 srp_map_desc(state, dma_addr, dma_len, target->rkey);
991 srp_map_update_start(state, NULL, 0, 0);
992 return 0;
f5358a17
RD		 993 }
994
8f26c9ff
DD		 995 /* If this is the first sg to go into the FMR, save our position.
996 * We need to know the first unmapped entry, its index, and the
997 * first unmapped address within that entry to be able to restart
998 * mapping after an error.
999 */
1000 if (!state->unmapped_sg)
1001 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 1002
8f26c9ff
DD		 1003 while (dma_len) {
1004 if (state->npages == SRP_FMR_SIZE) {
1005 ret = srp_map_finish_fmr(state, target);
1006 if (ret)
1007 return ret;
f5358a17 1008
8f26c9ff
DD		 1009 srp_map_update_start(state, sg, sg_index, dma_addr);
1010 }
1011
1012 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
f5358a17 1013
8f26c9ff
DD		 1014 if (!state->npages)
1015 state->base_dma_addr = dma_addr;
1016 state->pages[state->npages++] = dma_addr;
1017 state->fmr_len += len;
1018 dma_addr += len;
1019 dma_len -= len;
1020 }
1021
1022 /* If the last entry of the FMR wasn't a full page, then we need to
1023 * close it out and start a new one -- we can only merge at page
1024 * boundries.
1025 */
1026 ret = 0;
1027 if (len != dev->fmr_page_size) {
1028 ret = srp_map_finish_fmr(state, target);
1029 if (!ret)
1030 srp_map_update_start(state, NULL, 0, 0);
1031 }
f5358a17
RD		 1032 return ret;
1033}
1034
aef9ec39
RD		 1035static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1036 struct srp_request *req)
1037{
8f26c9ff 1038 struct scatterlist *scat, *sg;
aef9ec39 1039 struct srp_cmd *cmd = req->cmd->buf;
8f26c9ff 1040 int i, len, nents, count, use_fmr;
85507bcc
RC		 1041 struct srp_device *dev;
1042 struct ib_device *ibdev;
8f26c9ff
DD		 1043 struct srp_map_state state;
1044 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 1045 u32 table_len;
1046 u8 fmt;
aef9ec39 1047
bb350d1d 1048 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 1049 return sizeof (struct srp_cmd);
1050
1051 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1052 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 1053 shost_printk(KERN_WARNING, target->scsi_host,
1054 PFX "Unhandled data direction %d\n",
1055 scmnd->sc_data_direction);
aef9ec39
RD		 1056 return -EINVAL;
1057 }
1058
bb350d1d
FT		 1059 nents = scsi_sg_count(scmnd);
1060 scat = scsi_sglist(scmnd);
aef9ec39 1061
05321937 1062 dev = target->srp_host->srp_dev;
85507bcc
RC		 1063 ibdev = dev->dev;
1064
1065 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 1066 if (unlikely(count == 0))
1067 return -EIO;
f5358a17
RD		 1068
1069 fmt = SRP_DATA_DESC_DIRECT;
1070 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 1071
cf368713 1072 if (count == 1) {
f5358a17
RD		 1073 /*
1074 * The midlayer only generated a single gather/scatter
1075 * entry, or DMA mapping coalesced everything to a
1076 * single entry. So a direct descriptor along with
1077 * the DMA MR suffices.
1078 */
cf368713 1079 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 1080
85507bcc 1081 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 1082 buf->key = cpu_to_be32(target->rkey);
85507bcc 1083 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff
DD		 1084
1085 req->nfmr = 0;
1086 goto map_complete;
1087 }
1088
1089 /* We have more than one scatter/gather entry, so build our indirect
1090 * descriptor table, trying to merge as many entries with FMR as we
1091 * can.
1092 */
1093 indirect_hdr = (void *) cmd->add_data;
1094
c07d424d
DD		 1095 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1096 target->indirect_size, DMA_TO_DEVICE);
1097
8f26c9ff 1098 memset(&state, 0, sizeof(state));
c07d424d 1099 state.desc = req->indirect_desc;
8f26c9ff
DD		 1100 state.pages = req->map_page;
1101 state.next_fmr = req->fmr_list;
1102
1103 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
1104
1105 for_each_sg(scat, sg, count, i) {
1106 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
1107 /* FMR mapping failed, so backtrack to the first
1108 * unmapped entry and continue on without using FMR.
1109 */
1110 dma_addr_t dma_addr;
1111 unsigned int dma_len;
1112
1113backtrack:
1114 sg = state.unmapped_sg;
1115 i = state.unmapped_index;
1116
1117 dma_addr = ib_sg_dma_address(ibdev, sg);
1118 dma_len = ib_sg_dma_len(ibdev, sg);
1119 dma_len -= (state.unmapped_addr - dma_addr);
1120 dma_addr = state.unmapped_addr;
1121 use_fmr = SRP_MAP_NO_FMR;
1122 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
f5358a17 1123 }
8f26c9ff 1124 }
aef9ec39 1125
8f26c9ff
DD		 1126 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
1127 goto backtrack;
cf368713 1128
c07d424d
DD		 1129 /* We've mapped the request, now pull as much of the indirect
1130 * descriptor table as we can into the command buffer. If this
1131 * target is not using an external indirect table, we are
1132 * guaranteed to fit into the command, as the SCSI layer won't
1133 * give us more S/G entries than we allow.
8f26c9ff
DD		 1134 */
1135 req->nfmr = state.nfmr;
1136 if (state.ndesc == 1) {
1137 /* FMR mapping was able to collapse this to one entry,
1138 * so use a direct descriptor.
1139 */
1140 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1141
c07d424d 1142 *buf = req->indirect_desc[0];
8f26c9ff 1143 goto map_complete;
aef9ec39
RD		 1144 }
1145
c07d424d
DD		 1146 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1147 !target->allow_ext_sg)) {
1148 shost_printk(KERN_ERR, target->scsi_host,
1149 "Could not fit S/G list into SRP_CMD\n");
1150 return -EIO;
1151 }
1152
1153 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1154 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1155
1156 fmt = SRP_DATA_DESC_INDIRECT;
1157 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1158 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1159
c07d424d
DD		 1160 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1161 count * sizeof (struct srp_direct_buf));
8f26c9ff 1162
c07d424d 1163 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1164 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1165 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1166 indirect_hdr->len = cpu_to_be32(state.total_len);
1167
1168 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1169 cmd->data_out_desc_cnt = count;
8f26c9ff 1170 else
c07d424d
DD		 1171 cmd->data_in_desc_cnt = count;
1172
1173 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1174 DMA_TO_DEVICE);
8f26c9ff
DD		 1175
1176map_complete:
aef9ec39
RD		 1177 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1178 cmd->buf_fmt = fmt << 4;
1179 else
1180 cmd->buf_fmt = fmt;
1181
aef9ec39
RD		 1182 return len;
1183}
1184
76c75b25
BVA		 1185/*
1186 * Return an IU and possible credit to the free pool
1187 */
1188static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1189 enum srp_iu_type iu_type)
1190{
1191 unsigned long flags;
1192
e9684678 1193 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1194 list_add(&iu->list, &target->free_tx);
1195 if (iu_type != SRP_IU_RSP)
1196 ++target->req_lim;
e9684678 1197 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1198}
1199
05a1d750 1200/*
e9684678
BVA		 1201 * Must be called with target->lock held to protect req_lim and free_tx.
1202 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1203 *
1204 * Note:
1205 * An upper limit for the number of allocated information units for each
1206 * request type is:
1207 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1208 * more than Scsi_Host.can_queue requests.
1209 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1210 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1211 * one unanswered SRP request to an initiator.
1212 */
1213static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1214 enum srp_iu_type iu_type)
1215{
1216 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1217 struct srp_iu *iu;
1218
1219 srp_send_completion(target->send_cq, target);
1220
dcb4cb85 1221 if (list_empty(&target->free_tx))
05a1d750
DD		 1222 return NULL;
1223
1224 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1225 if (iu_type != SRP_IU_RSP) {
1226 if (target->req_lim <= rsv) {
1227 ++target->zero_req_lim;
1228 return NULL;
1229 }
1230
1231 --target->req_lim;
05a1d750
DD		 1232 }
1233
dcb4cb85 1234 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1235 list_del(&iu->list);
05a1d750
DD		 1236 return iu;
1237}
1238
76c75b25
BVA		 1239static int srp_post_send(struct srp_target_port *target,
1240 struct srp_iu *iu, int len)
05a1d750
DD		 1241{
1242 struct ib_sge list;
1243 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1244
1245 list.addr = iu->dma;
1246 list.length = len;
9af76271 1247 list.lkey = target->lkey;
05a1d750
DD		 1248
1249 wr.next = NULL;
dcb4cb85 1250 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1251 wr.sg_list = &list;
1252 wr.num_sge = 1;
1253 wr.opcode = IB_WR_SEND;
1254 wr.send_flags = IB_SEND_SIGNALED;
1255
76c75b25 1256 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1257}
1258
dcb4cb85 1259static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1260{
c996bb47 1261 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1262 struct ib_sge list;
c996bb47
BVA		 1263
1264 list.addr = iu->dma;
1265 list.length = iu->size;
9af76271 1266 list.lkey = target->lkey;
c996bb47
BVA		 1267
1268 wr.next = NULL;
dcb4cb85 1269 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1270 wr.sg_list = &list;
1271 wr.num_sge = 1;
1272
dcb4cb85 1273 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1274}
1275
aef9ec39
RD		 1276static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1277{
1278 struct srp_request *req;
1279 struct scsi_cmnd *scmnd;
1280 unsigned long flags;
aef9ec39 1281
aef9ec39 1282 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1283 spin_lock_irqsave(&target->lock, flags);
94a9174c 1284 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1285 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1286
f8b6e31e
DD		 1287 target->tsk_mgmt_status = -1;
1288 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1289 target->tsk_mgmt_status = rsp->data[3];
1290 complete(&target->tsk_mgmt_done);
aef9ec39 1291 } else {
f8b6e31e 1292 req = &target->req_ring[rsp->tag];
22032991
BVA		 1293 scmnd = srp_claim_req(target, req, NULL);
1294 if (!scmnd) {
7aa54bd7
DD		 1295 shost_printk(KERN_ERR, target->scsi_host,
1296 "Null scmnd for RSP w/tag %016llx\n",
1297 (unsigned long long) rsp->tag);
22032991
BVA		 1298
1299 spin_lock_irqsave(&target->lock, flags);
1300 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1301 spin_unlock_irqrestore(&target->lock, flags);
1302
1303 return;
1304 }
aef9ec39
RD		 1305 scmnd->result = rsp->status;
1306
1307 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1308 memcpy(scmnd->sense_buffer, rsp->data +
1309 be32_to_cpu(rsp->resp_data_len),
1310 min_t(int, be32_to_cpu(rsp->sense_data_len),
1311 SCSI_SENSE_BUFFERSIZE));
1312 }
1313
1314 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1315 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1316 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1317 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1318
22032991
BVA		 1319 srp_free_req(target, req, scmnd,
1320 be32_to_cpu(rsp->req_lim_delta));
1321
f8b6e31e
DD		 1322 scmnd->host_scribble = NULL;
1323 scmnd->scsi_done(scmnd);
aef9ec39 1324 }
aef9ec39
RD		 1325}
1326
bb12588a
DD		 1327static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1328 void *rsp, int len)
1329{
76c75b25 1330 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1331 unsigned long flags;
1332 struct srp_iu *iu;
76c75b25 1333 int err;
bb12588a 1334
e9684678 1335 spin_lock_irqsave(&target->lock, flags);
bb12588a 1336 target->req_lim += req_delta;
bb12588a 1337 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1338 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1339
bb12588a
DD		 1340 if (!iu) {
1341 shost_printk(KERN_ERR, target->scsi_host, PFX
1342 "no IU available to send response\n");
76c75b25 1343 return 1;
bb12588a
DD		 1344 }
1345
1346 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1347 memcpy(iu->buf, rsp, len);
1348 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1349
76c75b25
BVA		 1350 err = srp_post_send(target, iu, len);
1351 if (err) {
bb12588a
DD		 1352 shost_printk(KERN_ERR, target->scsi_host, PFX
1353 "unable to post response: %d\n", err);
76c75b25
BVA		 1354 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1355 }
bb12588a 1356
bb12588a
DD		 1357 return err;
1358}
1359
1360static void srp_process_cred_req(struct srp_target_port *target,
1361 struct srp_cred_req *req)
1362{
1363 struct srp_cred_rsp rsp = {
1364 .opcode = SRP_CRED_RSP,
1365 .tag = req->tag,
1366 };
1367 s32 delta = be32_to_cpu(req->req_lim_delta);
1368
1369 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1370 shost_printk(KERN_ERR, target->scsi_host, PFX
1371 "problems processing SRP_CRED_REQ\n");
1372}
1373
1374static void srp_process_aer_req(struct srp_target_port *target,
1375 struct srp_aer_req *req)
1376{
1377 struct srp_aer_rsp rsp = {
1378 .opcode = SRP_AER_RSP,
1379 .tag = req->tag,
1380 };
1381 s32 delta = be32_to_cpu(req->req_lim_delta);
1382
1383 shost_printk(KERN_ERR, target->scsi_host, PFX
1384 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1385
1386 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1387 shost_printk(KERN_ERR, target->scsi_host, PFX
1388 "problems processing SRP_AER_REQ\n");
1389}
1390
aef9ec39
RD		 1391static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1392{
dcb4cb85 1393 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1394 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1395 int res;
aef9ec39
RD		 1396 u8 opcode;
1397
85507bcc
RC		 1398 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1399 DMA_FROM_DEVICE);
aef9ec39
RD		 1400
1401 opcode = *(u8 *) iu->buf;
1402
1403 if (0) {
7aa54bd7
DD		 1404 shost_printk(KERN_ERR, target->scsi_host,
1405 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1406 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1407 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1408 }
1409
1410 switch (opcode) {
1411 case SRP_RSP:
1412 srp_process_rsp(target, iu->buf);
1413 break;
1414
bb12588a
DD		 1415 case SRP_CRED_REQ:
1416 srp_process_cred_req(target, iu->buf);
1417 break;
1418
1419 case SRP_AER_REQ:
1420 srp_process_aer_req(target, iu->buf);
1421 break;
1422
aef9ec39
RD		 1423 case SRP_T_LOGOUT:
1424 /* XXX Handle target logout */
7aa54bd7
DD		 1425 shost_printk(KERN_WARNING, target->scsi_host,
1426 PFX "Got target logout request\n");
aef9ec39
RD		 1427 break;
1428
1429 default:
7aa54bd7
DD		 1430 shost_printk(KERN_WARNING, target->scsi_host,
1431 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1432 break;
1433 }
1434
85507bcc
RC		 1435 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1436 DMA_FROM_DEVICE);
c996bb47 1437
dcb4cb85 1438 res = srp_post_recv(target, iu);
c996bb47
BVA		 1439 if (res != 0)
1440 shost_printk(KERN_ERR, target->scsi_host,
1441 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1442}
1443
c1120f89
BVA		 1444/**
1445 * srp_tl_err_work() - handle a transport layer error
1446 *
1447 * Note: This function may get invoked before the rport has been created,
1448 * hence the target->rport test.
1449 */
1450static void srp_tl_err_work(struct work_struct *work)
1451{
1452 struct srp_target_port *target;
1453
1454 target = container_of(work, struct srp_target_port, tl_err_work);
1455 if (target->rport)
1456 srp_start_tl_fail_timers(target->rport);
1457}
1458
cd4e3854 1459static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
948d1e88
BVA		 1460 struct srp_target_port *target)
1461{
294c875a 1462 if (target->connected && !target->qp_in_error) {
4f0af697
BVA		 1463 shost_printk(KERN_ERR, target->scsi_host,
1464 PFX "failed %s status %d\n",
cd4e3854 1465 send_err ? "send" : "receive",
4f0af697 1466 wc_status);
c1120f89 1467 queue_work(system_long_wq, &target->tl_err_work);
4f0af697 1468 }
948d1e88
BVA		 1469 target->qp_in_error = true;
1470}
1471
9c03dc9f 1472static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1473{
1474 struct srp_target_port *target = target_ptr;
1475 struct ib_wc wc;
aef9ec39
RD		 1476
1477 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1478 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1479 if (likely(wc.status == IB_WC_SUCCESS)) {
1480 srp_handle_recv(target, &wc);
1481 } else {
cd4e3854 1482 srp_handle_qp_err(wc.status, false, target);
aef9ec39 1483 }
9c03dc9f
BVA		 1484 }
1485}
1486
1487static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1488{
1489 struct srp_target_port *target = target_ptr;
1490 struct ib_wc wc;
dcb4cb85 1491 struct srp_iu *iu;
9c03dc9f
BVA		 1492
1493 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1494 if (likely(wc.status == IB_WC_SUCCESS)) {
1495 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1496 list_add(&iu->list, &target->free_tx);
1497 } else {
cd4e3854 1498 srp_handle_qp_err(wc.status, true, target);
9c03dc9f 1499 }
aef9ec39
RD		 1500 }
1501}
1502
76c75b25 1503static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1504{
76c75b25 1505 struct srp_target_port *target = host_to_target(shost);
a95cadb9 1506 struct srp_rport *rport = target->rport;
aef9ec39
RD		 1507 struct srp_request *req;
1508 struct srp_iu *iu;
1509 struct srp_cmd *cmd;
85507bcc 1510 struct ib_device *dev;
76c75b25 1511 unsigned long flags;
ed9b2264 1512 int len, result;
a95cadb9
BVA		 1513 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1514
1515 /*
1516 * The SCSI EH thread is the only context from which srp_queuecommand()
1517 * can get invoked for blocked devices (SDEV_BLOCK /
1518 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1519 * locking the rport mutex if invoked from inside the SCSI EH.
1520 */
1521 if (in_scsi_eh)
1522 mutex_lock(&rport->mutex);
aef9ec39 1523
ed9b2264
BVA		 1524 result = srp_chkready(target->rport);
1525 if (unlikely(result)) {
1526 scmnd->result = result;
2ce19e72 1527 scmnd->scsi_done(scmnd);
a95cadb9 1528 goto unlock_rport;
2ce19e72
BVA		 1529 }
1530
e9684678 1531 spin_lock_irqsave(&target->lock, flags);
bb12588a 1532 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1533 if (!iu)
695b8349
BVA		 1534 goto err_unlock;
1535
1536 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1537 list_del(&req->list);
1538 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1539
05321937 1540 dev = target->srp_host->srp_dev->dev;
49248644 1541 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1542 DMA_TO_DEVICE);
aef9ec39 1543
aef9ec39 1544 scmnd->result = 0;
f8b6e31e 1545 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1546
1547 cmd = iu->buf;
1548 memset(cmd, 0, sizeof *cmd);
1549
1550 cmd->opcode = SRP_CMD;
1551 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1552 cmd->tag = req->index;
aef9ec39
RD		 1553 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1554
aef9ec39
RD		 1555 req->scmnd = scmnd;
1556 req->cmd = iu;
aef9ec39
RD		 1557
1558 len = srp_map_data(scmnd, target, req);
1559 if (len < 0) {
7aa54bd7
DD		 1560 shost_printk(KERN_ERR, target->scsi_host,
1561 PFX "Failed to map data\n");
76c75b25 1562 goto err_iu;
aef9ec39
RD		 1563 }
1564
49248644 1565 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1566 DMA_TO_DEVICE);
aef9ec39 1567
76c75b25 1568 if (srp_post_send(target, iu, len)) {
7aa54bd7 1569 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1570 goto err_unmap;
1571 }
1572
a95cadb9
BVA		 1573unlock_rport:
1574 if (in_scsi_eh)
1575 mutex_unlock(&rport->mutex);
1576
aef9ec39
RD		 1577 return 0;
1578
1579err_unmap:
1580 srp_unmap_data(scmnd, target, req);
1581
76c75b25
BVA		 1582err_iu:
1583 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1584
e9684678 1585 spin_lock_irqsave(&target->lock, flags);
76c75b25 1586 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1587
1588err_unlock:
e9684678 1589 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1590
a95cadb9
BVA		 1591 if (in_scsi_eh)
1592 mutex_unlock(&rport->mutex);
1593
aef9ec39
RD		 1594 return SCSI_MLQUEUE_HOST_BUSY;
1595}
1596
4d73f95f
BVA		 1597/*
1598 * Note: the resources allocated in this function are freed in
1599 * srp_free_target_ib().
1600 */
aef9ec39
RD		 1601static int srp_alloc_iu_bufs(struct srp_target_port *target)
1602{
1603 int i;
1604
4d73f95f
BVA		 1605 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1606 GFP_KERNEL);
1607 if (!target->rx_ring)
1608 goto err_no_ring;
1609 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1610 GFP_KERNEL);
1611 if (!target->tx_ring)
1612 goto err_no_ring;
1613
1614 for (i = 0; i < target->queue_size; ++i) {
aef9ec39
RD		 1615 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1616 target->max_ti_iu_len,
1617 GFP_KERNEL, DMA_FROM_DEVICE);
1618 if (!target->rx_ring[i])
1619 goto err;
1620 }
1621
4d73f95f 1622 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1623 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1624 target->max_iu_len,
aef9ec39
RD		 1625 GFP_KERNEL, DMA_TO_DEVICE);
1626 if (!target->tx_ring[i])
1627 goto err;
dcb4cb85
BVA		 1628
1629 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1630 }
1631
1632 return 0;
1633
1634err:
4d73f95f 1635 for (i = 0; i < target->queue_size; ++i) {
aef9ec39 1636 srp_free_iu(target->srp_host, target->rx_ring[i]);
aef9ec39 1637 srp_free_iu(target->srp_host, target->tx_ring[i]);
aef9ec39
RD		 1638 }
1639
4d73f95f
BVA		 1640
1641err_no_ring:
1642 kfree(target->tx_ring);
1643 target->tx_ring = NULL;
1644 kfree(target->rx_ring);
1645 target->rx_ring = NULL;
1646
aef9ec39
RD		 1647 return -ENOMEM;
1648}
1649
c9b03c1a
BVA		 1650static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1651{
1652 uint64_t T_tr_ns, max_compl_time_ms;
1653 uint32_t rq_tmo_jiffies;
1654
1655 /*
1656 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1657 * table 91), both the QP timeout and the retry count have to be set
1658 * for RC QP's during the RTR to RTS transition.
1659 */
1660 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1661 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1662
1663 /*
1664 * Set target->rq_tmo_jiffies to one second more than the largest time
1665 * it can take before an error completion is generated. See also
1666 * C9-140..142 in the IBTA spec for more information about how to
1667 * convert the QP Local ACK Timeout value to nanoseconds.
1668 */
1669 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1670 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1671 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1672 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1673
1674 return rq_tmo_jiffies;
1675}
1676
961e0be8
DD		 1677static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1678 struct srp_login_rsp *lrsp,
1679 struct srp_target_port *target)
1680{
1681 struct ib_qp_attr *qp_attr = NULL;
1682 int attr_mask = 0;
1683 int ret;
1684 int i;
1685
1686 if (lrsp->opcode == SRP_LOGIN_RSP) {
1687 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1688 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1689
1690 /*
1691 * Reserve credits for task management so we don't
1692 * bounce requests back to the SCSI mid-layer.
1693 */
1694 target->scsi_host->can_queue
1695 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1696 target->scsi_host->can_queue);
4d73f95f
BVA		 1697 target->scsi_host->cmd_per_lun
1698 = min_t(int, target->scsi_host->can_queue,
1699 target->scsi_host->cmd_per_lun);
961e0be8
DD		 1700 } else {
1701 shost_printk(KERN_WARNING, target->scsi_host,
1702 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1703 ret = -ECONNRESET;
1704 goto error;
1705 }
1706
4d73f95f 1707 if (!target->rx_ring) {
961e0be8
DD		 1708 ret = srp_alloc_iu_bufs(target);
1709 if (ret)
1710 goto error;
1711 }
1712
1713 ret = -ENOMEM;
1714 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1715 if (!qp_attr)
1716 goto error;
1717
1718 qp_attr->qp_state = IB_QPS_RTR;
1719 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1720 if (ret)
1721 goto error_free;
1722
1723 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1724 if (ret)
1725 goto error_free;
1726
4d73f95f 1727 for (i = 0; i < target->queue_size; i++) {
961e0be8
DD		 1728 struct srp_iu *iu = target->rx_ring[i];
1729 ret = srp_post_recv(target, iu);
1730 if (ret)
1731 goto error_free;
1732 }
1733
1734 qp_attr->qp_state = IB_QPS_RTS;
1735 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1736 if (ret)
1737 goto error_free;
1738
c9b03c1a
BVA		 1739 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1740
961e0be8
DD		 1741 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1742 if (ret)
1743 goto error_free;
1744
1745 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1746
1747error_free:
1748 kfree(qp_attr);
1749
1750error:
1751 target->status = ret;
1752}
1753
aef9ec39
RD		 1754static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1755 struct ib_cm_event *event,
1756 struct srp_target_port *target)
1757{
7aa54bd7 1758 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1759 struct ib_class_port_info *cpi;
1760 int opcode;
1761
1762 switch (event->param.rej_rcvd.reason) {
1763 case IB_CM_REJ_PORT_CM_REDIRECT:
1764 cpi = event->param.rej_rcvd.ari;
1765 target->path.dlid = cpi->redirect_lid;
1766 target->path.pkey = cpi->redirect_pkey;
1767 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1768 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1769
1770 target->status = target->path.dlid ?
1771 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1772 break;
1773
1774 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1775 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1776 /*
1777 * Topspin/Cisco SRP gateways incorrectly send
1778 * reject reason code 25 when they mean 24
1779 * (port redirect).
1780 */
1781 memcpy(target->path.dgid.raw,
1782 event->param.rej_rcvd.ari, 16);
1783
7aa54bd7
DD		 1784 shost_printk(KERN_DEBUG, shost,
1785 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1786 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1787 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1788
1789 target->status = SRP_PORT_REDIRECT;
1790 } else {
7aa54bd7
DD		 1791 shost_printk(KERN_WARNING, shost,
1792 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1793 target->status = -ECONNRESET;
1794 }
1795 break;
1796
1797 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1798 shost_printk(KERN_WARNING, shost,
1799 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1800 target->status = -ECONNRESET;
1801 break;
1802
1803 case IB_CM_REJ_CONSUMER_DEFINED:
1804 opcode = *(u8 *) event->private_data;
1805 if (opcode == SRP_LOGIN_REJ) {
1806 struct srp_login_rej *rej = event->private_data;
1807 u32 reason = be32_to_cpu(rej->reason);
1808
1809 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1810 shost_printk(KERN_WARNING, shost,
1811 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1812 else
e7ffde01
BVA		 1813 shost_printk(KERN_WARNING, shost, PFX
1814 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
1815 target->path.sgid.raw,
1816 target->orig_dgid, reason);
aef9ec39 1817 } else
7aa54bd7
DD		 1818 shost_printk(KERN_WARNING, shost,
1819 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1820 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1821 target->status = -ECONNRESET;
1822 break;
1823
9fe4bcf4
DD		 1824 case IB_CM_REJ_STALE_CONN:
1825 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1826 target->status = SRP_STALE_CONN;
1827 break;
1828
aef9ec39 1829 default:
7aa54bd7
DD		 1830 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1831 event->param.rej_rcvd.reason);
aef9ec39
RD		 1832 target->status = -ECONNRESET;
1833 }
1834}
1835
1836static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1837{
1838 struct srp_target_port *target = cm_id->context;
aef9ec39 1839 int comp = 0;
aef9ec39
RD		 1840
1841 switch (event->event) {
1842 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1843 shost_printk(KERN_DEBUG, target->scsi_host,
1844 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1845 comp = 1;
1846 target->status = -ECONNRESET;
1847 break;
1848
1849 case IB_CM_REP_RECEIVED:
1850 comp = 1;
961e0be8 1851 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 1852 break;
1853
1854 case IB_CM_REJ_RECEIVED:
7aa54bd7 1855 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1856 comp = 1;
1857
1858 srp_cm_rej_handler(cm_id, event, target);
1859 break;
1860
b7ac4ab4 1861 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1862 shost_printk(KERN_WARNING, target->scsi_host,
1863 PFX "DREQ received - connection closed\n");
294c875a 1864 srp_change_conn_state(target, false);
b7ac4ab4 1865 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1866 shost_printk(KERN_ERR, target->scsi_host,
1867 PFX "Sending CM DREP failed\n");
c1120f89 1868 queue_work(system_long_wq, &target->tl_err_work);
aef9ec39
RD		 1869 break;
1870
1871 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1872 shost_printk(KERN_ERR, target->scsi_host,
1873 PFX "connection closed\n");
aef9ec39 1874
aef9ec39
RD		 1875 target->status = 0;
1876 break;
1877
b7ac4ab4
IR		 1878 case IB_CM_MRA_RECEIVED:
1879 case IB_CM_DREQ_ERROR:
1880 case IB_CM_DREP_RECEIVED:
1881 break;
1882
aef9ec39 1883 default:
7aa54bd7
DD		 1884 shost_printk(KERN_WARNING, target->scsi_host,
1885 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1886 break;
1887 }
1888
1889 if (comp)
1890 complete(&target->done);
1891
aef9ec39
RD		 1892 return 0;
1893}
1894
71444b97
JW		 1895/**
1896 * srp_change_queue_type - changing device queue tag type
1897 * @sdev: scsi device struct
1898 * @tag_type: requested tag type
1899 *
1900 * Returns queue tag type.
1901 */
1902static int
1903srp_change_queue_type(struct scsi_device *sdev, int tag_type)
1904{
1905 if (sdev->tagged_supported) {
1906 scsi_set_tag_type(sdev, tag_type);
1907 if (tag_type)
1908 scsi_activate_tcq(sdev, sdev->queue_depth);
1909 else
1910 scsi_deactivate_tcq(sdev, sdev->queue_depth);
1911 } else
1912 tag_type = 0;
1913
1914 return tag_type;
1915}
1916
1917/**
1918 * srp_change_queue_depth - setting device queue depth
1919 * @sdev: scsi device struct
1920 * @qdepth: requested queue depth
1921 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
1922 * (see include/scsi/scsi_host.h for definition)
1923 *
1924 * Returns queue depth.
1925 */
1926static int
1927srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
1928{
1929 struct Scsi_Host *shost = sdev->host;
1930 int max_depth;
1931 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
1932 max_depth = shost->can_queue;
1933 if (!sdev->tagged_supported)
1934 max_depth = 1;
1935 if (qdepth > max_depth)
1936 qdepth = max_depth;
1937 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
1938 } else if (reason == SCSI_QDEPTH_QFULL)
1939 scsi_track_queue_full(sdev, qdepth);
1940 else
1941 return -EOPNOTSUPP;
1942
1943 return sdev->queue_depth;
1944}
1945
d945e1df 1946static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 1947 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 1948{
a95cadb9 1949 struct srp_rport *rport = target->rport;
19081f31 1950 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 1951 struct srp_iu *iu;
1952 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 1953
3780d1f0
BVA		 1954 if (!target->connected || target->qp_in_error)
1955 return -1;
1956
f8b6e31e 1957 init_completion(&target->tsk_mgmt_done);
aef9ec39 1958
a95cadb9
BVA		 1959 /*
1960 * Lock the rport mutex to avoid that srp_create_target_ib() is
1961 * invoked while a task management function is being sent.
1962 */
1963 mutex_lock(&rport->mutex);
e9684678 1964 spin_lock_irq(&target->lock);
bb12588a 1965 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 1966 spin_unlock_irq(&target->lock);
76c75b25 1967
a95cadb9
BVA		 1968 if (!iu) {
1969 mutex_unlock(&rport->mutex);
1970
76c75b25 1971 return -1;
a95cadb9 1972 }
aef9ec39 1973
19081f31
DD		 1974 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1975 DMA_TO_DEVICE);
aef9ec39
RD		 1976 tsk_mgmt = iu->buf;
1977 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1978
1979 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 1980 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1981 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 1982 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 1983 tsk_mgmt->task_tag = req_tag;
aef9ec39 1984
19081f31
DD		 1985 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1986 DMA_TO_DEVICE);
76c75b25
BVA		 1987 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
1988 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
a95cadb9
BVA		 1989 mutex_unlock(&rport->mutex);
1990
76c75b25
BVA		 1991 return -1;
1992 }
a95cadb9 1993 mutex_unlock(&rport->mutex);
d945e1df 1994
f8b6e31e 1995 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 1996 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1997 return -1;
aef9ec39 1998
d945e1df 1999 return 0;
d945e1df
RD		 2000}
2001
aef9ec39
RD		 2002static int srp_abort(struct scsi_cmnd *scmnd)
2003{
d945e1df 2004 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 2005 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
086f44f5 2006 int ret;
d945e1df 2007
7aa54bd7 2008 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 2009
c7c4e7ff 2010 if (!req || !srp_claim_req(target, req, scmnd))
99b6697a 2011 return SUCCESS;
086f44f5 2012 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
80d5e8a2 2013 SRP_TSK_ABORT_TASK) == 0)
086f44f5 2014 ret = SUCCESS;
ed9b2264 2015 else if (target->rport->state == SRP_RPORT_LOST)
99e1c139 2016 ret = FAST_IO_FAIL;
086f44f5
BVA		 2017 else
2018 ret = FAILED;
22032991
BVA		 2019 srp_free_req(target, req, scmnd, 0);
2020 scmnd->result = DID_ABORT << 16;
d8536670 2021 scmnd->scsi_done(scmnd);
d945e1df 2022
086f44f5 2023 return ret;
aef9ec39
RD		 2024}
2025
2026static int srp_reset_device(struct scsi_cmnd *scmnd)
2027{
d945e1df 2028 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 2029 int i;
d945e1df 2030
7aa54bd7 2031 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 2032
f8b6e31e
DD		 2033 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2034 SRP_TSK_LUN_RESET))
d945e1df 2035 return FAILED;
f8b6e31e 2036 if (target->tsk_mgmt_status)
d945e1df
RD		 2037 return FAILED;
2038
4d73f95f 2039 for (i = 0; i < target->req_ring_size; ++i) {
536ae14e 2040 struct srp_request *req = &target->req_ring[i];
f8b6e31e 2041 if (req->scmnd && req->scmnd->device == scmnd->device)
ed9b2264 2042 srp_finish_req(target, req, DID_RESET << 16);
536ae14e 2043 }
d945e1df 2044
d945e1df 2045 return SUCCESS;
aef9ec39
RD		 2046}
2047
2048static int srp_reset_host(struct scsi_cmnd *scmnd)
2049{
2050 struct srp_target_port *target = host_to_target(scmnd->device->host);
aef9ec39 2051
7aa54bd7 2052 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39 2053
ed9b2264 2054 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
aef9ec39
RD		 2055}
2056
c9b03c1a
BVA		 2057static int srp_slave_configure(struct scsi_device *sdev)
2058{
2059 struct Scsi_Host *shost = sdev->host;
2060 struct srp_target_port *target = host_to_target(shost);
2061 struct request_queue *q = sdev->request_queue;
2062 unsigned long timeout;
2063
2064 if (sdev->type == TYPE_DISK) {
2065 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2066 blk_queue_rq_timeout(q, timeout);
2067 }
2068
2069 return 0;
2070}
2071
ee959b00
TJ		 2072static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2073 char *buf)
6ecb0c84 2074{
ee959b00 2075 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2076
6ecb0c84
RD		 2077 return sprintf(buf, "0x%016llx\n",
2078 (unsigned long long) be64_to_cpu(target->id_ext));
2079}
2080
ee959b00
TJ		 2081static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2082 char *buf)
6ecb0c84 2083{
ee959b00 2084 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2085
6ecb0c84
RD		 2086 return sprintf(buf, "0x%016llx\n",
2087 (unsigned long long) be64_to_cpu(target->ioc_guid));
2088}
2089
ee959b00
TJ		 2090static ssize_t show_service_id(struct device *dev,
2091 struct device_attribute *attr, char *buf)
6ecb0c84 2092{
ee959b00 2093 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2094
6ecb0c84
RD		 2095 return sprintf(buf, "0x%016llx\n",
2096 (unsigned long long) be64_to_cpu(target->service_id));
2097}
2098
ee959b00
TJ		 2099static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2100 char *buf)
6ecb0c84 2101{
ee959b00 2102 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2103
6ecb0c84
RD		 2104 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2105}
2106
848b3082
BVA		 2107static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2108 char *buf)
2109{
2110 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2111
2112 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2113}
2114
ee959b00
TJ		 2115static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2116 char *buf)
6ecb0c84 2117{
ee959b00 2118 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 2119
5b095d98 2120 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 2121}
2122
ee959b00
TJ		 2123static ssize_t show_orig_dgid(struct device *dev,
2124 struct device_attribute *attr, char *buf)
3633b3d0 2125{
ee959b00 2126 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 2127
5b095d98 2128 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 2129}
2130
89de7486
BVA		 2131static ssize_t show_req_lim(struct device *dev,
2132 struct device_attribute *attr, char *buf)
2133{
2134 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2135
89de7486
BVA		 2136 return sprintf(buf, "%d\n", target->req_lim);
2137}
2138
ee959b00
TJ		 2139static ssize_t show_zero_req_lim(struct device *dev,
2140 struct device_attribute *attr, char *buf)
6bfa24fa 2141{
ee959b00 2142 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 2143
6bfa24fa
RD		 2144 return sprintf(buf, "%d\n", target->zero_req_lim);
2145}
2146
ee959b00
TJ		 2147static ssize_t show_local_ib_port(struct device *dev,
2148 struct device_attribute *attr, char *buf)
ded7f1a1 2149{
ee959b00 2150 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 2151
2152 return sprintf(buf, "%d\n", target->srp_host->port);
2153}
2154
ee959b00
TJ		 2155static ssize_t show_local_ib_device(struct device *dev,
2156 struct device_attribute *attr, char *buf)
ded7f1a1 2157{
ee959b00 2158 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 2159
05321937 2160 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 2161}
2162
4b5e5f41
BVA		 2163static ssize_t show_comp_vector(struct device *dev,
2164 struct device_attribute *attr, char *buf)
2165{
2166 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2167
2168 return sprintf(buf, "%d\n", target->comp_vector);
2169}
2170
7bb312e4
VP		 2171static ssize_t show_tl_retry_count(struct device *dev,
2172 struct device_attribute *attr, char *buf)
2173{
2174 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2175
2176 return sprintf(buf, "%d\n", target->tl_retry_count);
2177}
2178
49248644
DD		 2179static ssize_t show_cmd_sg_entries(struct device *dev,
2180 struct device_attribute *attr, char *buf)
2181{
2182 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2183
2184 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2185}
2186
c07d424d
DD		 2187static ssize_t show_allow_ext_sg(struct device *dev,
2188 struct device_attribute *attr, char *buf)
2189{
2190 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2191
2192 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2193}
2194
ee959b00
TJ		 2195static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2196static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2197static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2198static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
848b3082 2199static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
ee959b00
TJ		 2200static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2201static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 2202static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 2203static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2204static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2205static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
4b5e5f41 2206static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
7bb312e4 2207static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
49248644 2208static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 2209static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 2210
2211static struct device_attribute *srp_host_attrs[] = {
2212 &dev_attr_id_ext,
2213 &dev_attr_ioc_guid,
2214 &dev_attr_service_id,
2215 &dev_attr_pkey,
848b3082 2216 &dev_attr_sgid,
ee959b00
TJ		 2217 &dev_attr_dgid,
2218 &dev_attr_orig_dgid,
89de7486 2219 &dev_attr_req_lim,
ee959b00
TJ		 2220 &dev_attr_zero_req_lim,
2221 &dev_attr_local_ib_port,
2222 &dev_attr_local_ib_device,
4b5e5f41 2223 &dev_attr_comp_vector,
7bb312e4 2224 &dev_attr_tl_retry_count,
49248644 2225 &dev_attr_cmd_sg_entries,
c07d424d 2226 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 2227 NULL
2228};
2229
aef9ec39
RD		 2230static struct scsi_host_template srp_template = {
2231 .module = THIS_MODULE,
b7f008fd
RD		 2232 .name = "InfiniBand SRP initiator",
2233 .proc_name = DRV_NAME,
c9b03c1a 2234 .slave_configure = srp_slave_configure,
aef9ec39
RD		 2235 .info = srp_target_info,
2236 .queuecommand = srp_queuecommand,
71444b97
JW		 2237 .change_queue_depth = srp_change_queue_depth,
2238 .change_queue_type = srp_change_queue_type,
aef9ec39
RD		 2239 .eh_abort_handler = srp_abort,
2240 .eh_device_reset_handler = srp_reset_device,
2241 .eh_host_reset_handler = srp_reset_host,
2742c1da 2242 .skip_settle_delay = true,
49248644 2243 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
4d73f95f 2244 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
aef9ec39 2245 .this_id = -1,
4d73f95f 2246 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
6ecb0c84
RD		 2247 .use_clustering = ENABLE_CLUSTERING,
2248 .shost_attrs = srp_host_attrs
aef9ec39
RD		 2249};
2250
2251static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2252{
3236822b
FT		 2253 struct srp_rport_identifiers ids;
2254 struct srp_rport *rport;
2255
aef9ec39
RD		 2256 sprintf(target->target_name, "SRP.T10:%016llX",
2257 (unsigned long long) be64_to_cpu(target->id_ext));
2258
05321937 2259 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 2260 return -ENODEV;
2261
3236822b
FT		 2262 memcpy(ids.port_id, &target->id_ext, 8);
2263 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 2264 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 2265 rport = srp_rport_add(target->scsi_host, &ids);
2266 if (IS_ERR(rport)) {
2267 scsi_remove_host(target->scsi_host);
2268 return PTR_ERR(rport);
2269 }
2270
dc1bdbd9 2271 rport->lld_data = target;
9dd69a60 2272 target->rport = rport;
dc1bdbd9 2273
b3589fd4 2274 spin_lock(&host->target_lock);
aef9ec39 2275 list_add_tail(&target->list, &host->target_list);
b3589fd4 2276 spin_unlock(&host->target_lock);
aef9ec39
RD		 2277
2278 target->state = SRP_TARGET_LIVE;
2279
aef9ec39 2280 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 2281 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 2282
2283 return 0;
2284}
2285
ee959b00 2286static void srp_release_dev(struct device *dev)
aef9ec39
RD		 2287{
2288 struct srp_host *host =
ee959b00 2289 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2290
2291 complete(&host->released);
2292}
2293
2294static struct class srp_class = {
2295 .name = "infiniband_srp",
ee959b00 2296 .dev_release = srp_release_dev
aef9ec39
RD		 2297};
2298
96fc248a
BVA		 2299/**
2300 * srp_conn_unique() - check whether the connection to a target is unique
2301 */
2302static bool srp_conn_unique(struct srp_host *host,
2303 struct srp_target_port *target)
2304{
2305 struct srp_target_port *t;
2306 bool ret = false;
2307
2308 if (target->state == SRP_TARGET_REMOVED)
2309 goto out;
2310
2311 ret = true;
2312
2313 spin_lock(&host->target_lock);
2314 list_for_each_entry(t, &host->target_list, list) {
2315 if (t != target &&
2316 target->id_ext == t->id_ext &&
2317 target->ioc_guid == t->ioc_guid &&
2318 target->initiator_ext == t->initiator_ext) {
2319 ret = false;
2320 break;
2321 }
2322 }
2323 spin_unlock(&host->target_lock);
2324
2325out:
2326 return ret;
2327}
2328
aef9ec39
RD		 2329/*
2330 * Target ports are added by writing
2331 *
2332 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2333 * pkey=<P_Key>,service_id=<service ID>
2334 *
2335 * to the add_target sysfs attribute.
2336 */
2337enum {
2338 SRP_OPT_ERR = 0,
2339 SRP_OPT_ID_EXT = 1 << 0,
2340 SRP_OPT_IOC_GUID = 1 << 1,
2341 SRP_OPT_DGID = 1 << 2,
2342 SRP_OPT_PKEY = 1 << 3,
2343 SRP_OPT_SERVICE_ID = 1 << 4,
2344 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2345 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2346 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2347 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2348 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2349 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2350 SRP_OPT_SG_TABLESIZE = 1 << 11,
4b5e5f41 2351 SRP_OPT_COMP_VECTOR = 1 << 12,
7bb312e4 2352 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
4d73f95f 2353 SRP_OPT_QUEUE_SIZE = 1 << 14,
aef9ec39
RD		 2354 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2355 SRP_OPT_IOC_GUID |
2356 SRP_OPT_DGID |
2357 SRP_OPT_PKEY |
2358 SRP_OPT_SERVICE_ID),
2359};
2360
a447c093 2361static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2362 { SRP_OPT_ID_EXT, "id_ext=%s" },
2363 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2364 { SRP_OPT_DGID, "dgid=%s" },
2365 { SRP_OPT_PKEY, "pkey=%x" },
2366 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2367 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2368 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2369 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2370 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2371 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2372 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2373 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
4b5e5f41 2374 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
7bb312e4 2375 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
4d73f95f 2376 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
52fb2b50 2377 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2378};
2379
2380static int srp_parse_options(const char *buf, struct srp_target_port *target)
2381{
2382 char *options, *sep_opt;
2383 char *p;
2384 char dgid[3];
2385 substring_t args[MAX_OPT_ARGS];
2386 int opt_mask = 0;
2387 int token;
2388 int ret = -EINVAL;
2389 int i;
2390
2391 options = kstrdup(buf, GFP_KERNEL);
2392 if (!options)
2393 return -ENOMEM;
2394
2395 sep_opt = options;
2396 while ((p = strsep(&sep_opt, ",")) != NULL) {
2397 if (!*p)
2398 continue;
2399
2400 token = match_token(p, srp_opt_tokens, args);
2401 opt_mask |= token;
2402
2403 switch (token) {
2404 case SRP_OPT_ID_EXT:
2405 p = match_strdup(args);
a20f3a6d
IR		 2406 if (!p) {
2407 ret = -ENOMEM;
2408 goto out;
2409 }
aef9ec39
RD		 2410 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2411 kfree(p);
2412 break;
2413
2414 case SRP_OPT_IOC_GUID:
2415 p = match_strdup(args);
a20f3a6d
IR		 2416 if (!p) {
2417 ret = -ENOMEM;
2418 goto out;
2419 }
aef9ec39
RD		 2420 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2421 kfree(p);
2422 break;
2423
2424 case SRP_OPT_DGID:
2425 p = match_strdup(args);
a20f3a6d
IR		 2426 if (!p) {
2427 ret = -ENOMEM;
2428 goto out;
2429 }
aef9ec39 2430 if (strlen(p) != 32) {
e0bda7d8 2431 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2432 kfree(p);
aef9ec39
RD		 2433 goto out;
2434 }
2435
2436 for (i = 0; i < 16; ++i) {
2437 strlcpy(dgid, p + i * 2, 3);
2438 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2439 }
bf17c1c7 2440 kfree(p);
3633b3d0 2441 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2442 break;
2443
2444 case SRP_OPT_PKEY:
2445 if (match_hex(args, &token)) {
e0bda7d8 2446 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2447 goto out;
2448 }
2449 target->path.pkey = cpu_to_be16(token);
2450 break;
2451
2452 case SRP_OPT_SERVICE_ID:
2453 p = match_strdup(args);
a20f3a6d
IR		 2454 if (!p) {
2455 ret = -ENOMEM;
2456 goto out;
2457 }
aef9ec39 2458 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2459 target->path.service_id = target->service_id;
aef9ec39
RD		 2460 kfree(p);
2461 break;
2462
2463 case SRP_OPT_MAX_SECT:
2464 if (match_int(args, &token)) {
e0bda7d8 2465 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2466 goto out;
2467 }
2468 target->scsi_host->max_sectors = token;
2469 break;
2470
4d73f95f
BVA		 2471 case SRP_OPT_QUEUE_SIZE:
2472 if (match_int(args, &token) || token < 1) {
2473 pr_warn("bad queue_size parameter '%s'\n", p);
2474 goto out;
2475 }
2476 target->scsi_host->can_queue = token;
2477 target->queue_size = token + SRP_RSP_SQ_SIZE +
2478 SRP_TSK_MGMT_SQ_SIZE;
2479 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2480 target->scsi_host->cmd_per_lun = token;
2481 break;
2482
52fb2b50 2483 case SRP_OPT_MAX_CMD_PER_LUN:
4d73f95f 2484 if (match_int(args, &token) || token < 1) {
e0bda7d8
BVA		 2485 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2486 p);
52fb2b50
VP		 2487 goto out;
2488 }
4d73f95f 2489 target->scsi_host->cmd_per_lun = token;
52fb2b50
VP		 2490 break;
2491
0c0450db
R		 2492 case SRP_OPT_IO_CLASS:
2493 if (match_hex(args, &token)) {
e0bda7d8 2494 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2495 goto out;
2496 }
2497 if (token != SRP_REV10_IB_IO_CLASS &&
2498 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2499 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2500 token, SRP_REV10_IB_IO_CLASS,
2501 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2502 goto out;
2503 }
2504 target->io_class = token;
2505 break;
2506
01cb9bcb
IR		 2507 case SRP_OPT_INITIATOR_EXT:
2508 p = match_strdup(args);
a20f3a6d
IR		 2509 if (!p) {
2510 ret = -ENOMEM;
2511 goto out;
2512 }
01cb9bcb
IR		 2513 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2514 kfree(p);
2515 break;
2516
49248644
DD		 2517 case SRP_OPT_CMD_SG_ENTRIES:
2518 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2519 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2520 p);
49248644
DD		 2521 goto out;
2522 }
2523 target->cmd_sg_cnt = token;
2524 break;
2525
c07d424d
DD		 2526 case SRP_OPT_ALLOW_EXT_SG:
2527 if (match_int(args, &token)) {
e0bda7d8 2528 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2529 goto out;
2530 }
2531 target->allow_ext_sg = !!token;
2532 break;
2533
2534 case SRP_OPT_SG_TABLESIZE:
2535 if (match_int(args, &token) || token < 1 ||
2536 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2537 pr_warn("bad max sg_tablesize parameter '%s'\n",
2538 p);
c07d424d
DD		 2539 goto out;
2540 }
2541 target->sg_tablesize = token;
2542 break;
2543
4b5e5f41
BVA		 2544 case SRP_OPT_COMP_VECTOR:
2545 if (match_int(args, &token) || token < 0) {
2546 pr_warn("bad comp_vector parameter '%s'\n", p);
2547 goto out;
2548 }
2549 target->comp_vector = token;
2550 break;
2551
7bb312e4
VP		 2552 case SRP_OPT_TL_RETRY_COUNT:
2553 if (match_int(args, &token) || token < 2 || token > 7) {
2554 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2555 p);
2556 goto out;
2557 }
2558 target->tl_retry_count = token;
2559 break;
2560
aef9ec39 2561 default:
e0bda7d8
BVA		 2562 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2563 p);
aef9ec39
RD		 2564 goto out;
2565 }
2566 }
2567
2568 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2569 ret = 0;
2570 else
2571 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2572 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2573 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2574 pr_warn("target creation request is missing parameter '%s'\n",
2575 srp_opt_tokens[i].pattern);
aef9ec39 2576
4d73f95f
BVA		 2577 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2578 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2579 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2580 target->scsi_host->cmd_per_lun,
2581 target->scsi_host->can_queue);
2582
aef9ec39
RD		 2583out:
2584 kfree(options);
2585 return ret;
2586}
2587
ee959b00
TJ		 2588static ssize_t srp_create_target(struct device *dev,
2589 struct device_attribute *attr,
aef9ec39
RD		 2590 const char *buf, size_t count)
2591{
2592 struct srp_host *host =
ee959b00 2593 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2594 struct Scsi_Host *target_host;
2595 struct srp_target_port *target;
c07d424d 2596 struct ib_device *ibdev = host->srp_dev->dev;
b81d00bd 2597 int ret;
aef9ec39
RD		 2598
2599 target_host = scsi_host_alloc(&srp_template,
2600 sizeof (struct srp_target_port));
2601 if (!target_host)
2602 return -ENOMEM;
2603
49248644 2604 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2605 target_host->max_channel = 0;
2606 target_host->max_id = 1;
3c8edf0e
AR		 2607 target_host->max_lun = SRP_MAX_LUN;
2608 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2609
aef9ec39 2610 target = host_to_target(target_host);
aef9ec39 2611
49248644
DD		 2612 target->io_class = SRP_REV16A_IB_IO_CLASS;
2613 target->scsi_host = target_host;
2614 target->srp_host = host;
2615 target->lkey = host->srp_dev->mr->lkey;
2616 target->rkey = host->srp_dev->mr->rkey;
2617 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2618 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2619 target->allow_ext_sg = allow_ext_sg;
7bb312e4 2620 target->tl_retry_count = 7;
4d73f95f 2621 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
aef9ec39 2622
2d7091bc
BVA		 2623 mutex_lock(&host->add_target_mutex);
2624
aef9ec39
RD		 2625 ret = srp_parse_options(buf, target);
2626 if (ret)
2627 goto err;
2628
4d73f95f
BVA		 2629 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2630
96fc248a
BVA		 2631 if (!srp_conn_unique(target->srp_host, target)) {
2632 shost_printk(KERN_INFO, target->scsi_host,
2633 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2634 be64_to_cpu(target->id_ext),
2635 be64_to_cpu(target->ioc_guid),
2636 be64_to_cpu(target->initiator_ext));
2637 ret = -EEXIST;
2638 goto err;
2639 }
2640
c07d424d
DD		 2641 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2642 target->cmd_sg_cnt < target->sg_tablesize) {
e0bda7d8 2643 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 2644 target->sg_tablesize = target->cmd_sg_cnt;
2645 }
2646
2647 target_host->sg_tablesize = target->sg_tablesize;
2648 target->indirect_size = target->sg_tablesize *
2649 sizeof (struct srp_direct_buf);
49248644
DD		 2650 target->max_iu_len = sizeof (struct srp_cmd) +
2651 sizeof (struct srp_indirect_buf) +
2652 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2653
c1120f89 2654 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
ef6c49d8 2655 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 2656 spin_lock_init(&target->lock);
2657 INIT_LIST_HEAD(&target->free_tx);
b81d00bd
BVA		 2658 ret = srp_alloc_req_data(target);
2659 if (ret)
2660 goto err_free_mem;
8f26c9ff 2661
2088ca66
SG		 2662 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2663 if (ret)
2664 goto err_free_mem;
aef9ec39 2665
aef9ec39
RD		 2666 ret = srp_create_target_ib(target);
2667 if (ret)
8f26c9ff 2668 goto err_free_mem;
aef9ec39 2669
9fe4bcf4
DD		 2670 ret = srp_new_cm_id(target);
2671 if (ret)
8f26c9ff 2672 goto err_free_ib;
aef9ec39
RD		 2673
2674 ret = srp_connect_target(target);
2675 if (ret) {
7aa54bd7
DD		 2676 shost_printk(KERN_ERR, target->scsi_host,
2677 PFX "Connection failed\n");
aef9ec39
RD		 2678 goto err_cm_id;
2679 }
2680
2681 ret = srp_add_target(host, target);
2682 if (ret)
2683 goto err_disconnect;
2684
e7ffde01
BVA		 2685 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2686 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
2687 be64_to_cpu(target->id_ext),
2688 be64_to_cpu(target->ioc_guid),
2689 be16_to_cpu(target->path.pkey),
2690 be64_to_cpu(target->service_id),
2691 target->path.sgid.raw, target->path.dgid.raw);
2692
2d7091bc
BVA		 2693 ret = count;
2694
2695out:
2696 mutex_unlock(&host->add_target_mutex);
2697 return ret;
aef9ec39
RD		 2698
2699err_disconnect:
2700 srp_disconnect_target(target);
2701
2702err_cm_id:
2703 ib_destroy_cm_id(target->cm_id);
2704
8f26c9ff 2705err_free_ib:
aef9ec39
RD		 2706 srp_free_target_ib(target);
2707
8f26c9ff
DD		 2708err_free_mem:
2709 srp_free_req_data(target);
2710
aef9ec39
RD		 2711err:
2712 scsi_host_put(target_host);
2d7091bc 2713 goto out;
aef9ec39
RD		 2714}
2715
ee959b00 2716static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2717
ee959b00
TJ		 2718static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2719 char *buf)
aef9ec39 2720{
ee959b00 2721 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2722
05321937 2723 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2724}
2725
ee959b00 2726static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2727
ee959b00
TJ		 2728static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2729 char *buf)
aef9ec39 2730{
ee959b00 2731 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2732
2733 return sprintf(buf, "%d\n", host->port);
2734}
2735
ee959b00 2736static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2737
f5358a17 2738static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2739{
2740 struct srp_host *host;
2741
2742 host = kzalloc(sizeof *host, GFP_KERNEL);
2743 if (!host)
2744 return NULL;
2745
2746 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2747 spin_lock_init(&host->target_lock);
aef9ec39 2748 init_completion(&host->released);
2d7091bc 2749 mutex_init(&host->add_target_mutex);
05321937 2750 host->srp_dev = device;
aef9ec39
RD		 2751 host->port = port;
2752
ee959b00
TJ		 2753 host->dev.class = &srp_class;
2754 host->dev.parent = device->dev->dma_device;
d927e38c 2755 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2756
ee959b00 2757 if (device_register(&host->dev))
f5358a17 2758 goto free_host;
ee959b00 2759 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2760 goto err_class;
ee959b00 2761 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2762 goto err_class;
ee959b00 2763 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2764 goto err_class;
2765
2766 return host;
2767
2768err_class:
ee959b00 2769 device_unregister(&host->dev);
aef9ec39 2770
f5358a17 2771free_host:
aef9ec39
RD		 2772 kfree(host);
2773
2774 return NULL;
2775}
2776
2777static void srp_add_one(struct ib_device *device)
2778{
f5358a17
RD		 2779 struct srp_device *srp_dev;
2780 struct ib_device_attr *dev_attr;
2781 struct ib_fmr_pool_param fmr_param;
aef9ec39 2782 struct srp_host *host;
be8b9814 2783 int max_pages_per_fmr, fmr_page_shift, s, e, p;
aef9ec39 2784
f5358a17
RD		 2785 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2786 if (!dev_attr)
cf311cd4 2787 return;
aef9ec39 2788
f5358a17 2789 if (ib_query_device(device, dev_attr)) {
e0bda7d8 2790 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 2791 goto free_attr;
2792 }
2793
2794 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2795 if (!srp_dev)
2796 goto free_attr;
2797
2798 /*
2799 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 2800 * minimum of 4096 bytes. We're unlikely to build large sglists
2801 * out of smaller entries.
f5358a17 2802 */
8f26c9ff
DD		 2803 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2804 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2805 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2806 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
f5358a17
RD		 2807
2808 INIT_LIST_HEAD(&srp_dev->dev_list);
2809
2810 srp_dev->dev = device;
2811 srp_dev->pd = ib_alloc_pd(device);
2812 if (IS_ERR(srp_dev->pd))
2813 goto free_dev;
2814
2815 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2816 IB_ACCESS_LOCAL_WRITE |
2817 IB_ACCESS_REMOTE_READ |
2818 IB_ACCESS_REMOTE_WRITE);
2819 if (IS_ERR(srp_dev->mr))
2820 goto err_pd;
2821
be8b9814
DD		 2822 for (max_pages_per_fmr = SRP_FMR_SIZE;
2823 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2824 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2825 memset(&fmr_param, 0, sizeof fmr_param);
2826 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2827 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2828 fmr_param.cache = 1;
2829 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2830 fmr_param.page_shift = fmr_page_shift;
2831 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2832 IB_ACCESS_REMOTE_WRITE |
2833 IB_ACCESS_REMOTE_READ);
2834
2835 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2836 if (!IS_ERR(srp_dev->fmr_pool))
2837 break;
2838 }
2839
f5358a17
RD		 2840 if (IS_ERR(srp_dev->fmr_pool))
2841 srp_dev->fmr_pool = NULL;
aef9ec39 2842
07ebafba 2843 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2844 s = 0;
2845 e = 0;
2846 } else {
2847 s = 1;
2848 e = device->phys_port_cnt;
2849 }
2850
2851 for (p = s; p <= e; ++p) {
f5358a17 2852 host = srp_add_port(srp_dev, p);
aef9ec39 2853 if (host)
f5358a17 2854 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2855 }
2856
f5358a17
RD		 2857 ib_set_client_data(device, &srp_client, srp_dev);
2858
2859 goto free_attr;
2860
2861err_pd:
2862 ib_dealloc_pd(srp_dev->pd);
2863
2864free_dev:
2865 kfree(srp_dev);
2866
2867free_attr:
2868 kfree(dev_attr);
aef9ec39
RD		 2869}
2870
2871static void srp_remove_one(struct ib_device *device)
2872{
f5358a17 2873 struct srp_device *srp_dev;
aef9ec39 2874 struct srp_host *host, *tmp_host;
ef6c49d8 2875 struct srp_target_port *target;
aef9ec39 2876
f5358a17 2877 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 2878 if (!srp_dev)
2879 return;
aef9ec39 2880
f5358a17 2881 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2882 device_unregister(&host->dev);
aef9ec39
RD		 2883 /*
2884 * Wait for the sysfs entry to go away, so that no new
2885 * target ports can be created.
2886 */
2887 wait_for_completion(&host->released);
2888
2889 /*
ef6c49d8 2890 * Remove all target ports.
aef9ec39 2891 */
b3589fd4 2892 spin_lock(&host->target_lock);
ef6c49d8
BVA		 2893 list_for_each_entry(target, &host->target_list, list)
2894 srp_queue_remove_work(target);
b3589fd4 2895 spin_unlock(&host->target_lock);
aef9ec39
RD		 2896
2897 /*
ef6c49d8 2898 * Wait for target port removal tasks.
aef9ec39 2899 */
ef6c49d8 2900 flush_workqueue(system_long_wq);
aef9ec39 2901
aef9ec39
RD		 2902 kfree(host);
2903 }
2904
f5358a17
RD		 2905 if (srp_dev->fmr_pool)
2906 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2907 ib_dereg_mr(srp_dev->mr);
2908 ib_dealloc_pd(srp_dev->pd);
2909
2910 kfree(srp_dev);
aef9ec39
RD		 2911}
2912
3236822b 2913static struct srp_function_template ib_srp_transport_functions = {
ed9b2264
BVA		 2914 .has_rport_state = true,
2915 .reset_timer_if_blocked = true,
a95cadb9 2916 .reconnect_delay = &srp_reconnect_delay,
ed9b2264
BVA		 2917 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
2918 .dev_loss_tmo = &srp_dev_loss_tmo,
2919 .reconnect = srp_rport_reconnect,
dc1bdbd9 2920 .rport_delete = srp_rport_delete,
ed9b2264 2921 .terminate_rport_io = srp_terminate_io,
3236822b
FT		 2922};
2923
aef9ec39
RD		 2924static int __init srp_init_module(void)
2925{
2926 int ret;
2927
dcb4cb85 2928 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 2929
49248644 2930 if (srp_sg_tablesize) {
e0bda7d8 2931 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 2932 if (!cmd_sg_entries)
2933 cmd_sg_entries = srp_sg_tablesize;
2934 }
2935
2936 if (!cmd_sg_entries)
2937 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2938
2939 if (cmd_sg_entries > 255) {
e0bda7d8 2940 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 2941 cmd_sg_entries = 255;
1e89a194
DD		 2942 }
2943
c07d424d
DD		 2944 if (!indirect_sg_entries)
2945 indirect_sg_entries = cmd_sg_entries;
2946 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 2947 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2948 cmd_sg_entries);
c07d424d
DD		 2949 indirect_sg_entries = cmd_sg_entries;
2950 }
2951
3236822b
FT		 2952 ib_srp_transport_template =
2953 srp_attach_transport(&ib_srp_transport_functions);
2954 if (!ib_srp_transport_template)
2955 return -ENOMEM;
2956
aef9ec39
RD		 2957 ret = class_register(&srp_class);
2958 if (ret) {
e0bda7d8 2959 pr_err("couldn't register class infiniband_srp\n");
3236822b 2960 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2961 return ret;
2962 }
2963
c1a0b23b
MT		 2964 ib_sa_register_client(&srp_sa_client);
2965
aef9ec39
RD		 2966 ret = ib_register_client(&srp_client);
2967 if (ret) {
e0bda7d8 2968 pr_err("couldn't register IB client\n");
3236822b 2969 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2970 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2971 class_unregister(&srp_class);
2972 return ret;
2973 }
2974
2975 return 0;
2976}
2977
2978static void __exit srp_cleanup_module(void)
2979{
2980 ib_unregister_client(&srp_client);
c1a0b23b 2981 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 2982 class_unregister(&srp_class);
3236822b 2983 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2984}
2985
2986module_init(srp_init_module);
2987module_exit(srp_cleanup_module);
Michael's Linux tree.