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