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IB/srp: Fix remove_one crash due to resource exhaustion
[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
aef9ec39
RD		 31 */
32
e0bda7d8
BVA		 33#define pr_fmt(fmt) PFX fmt
34
aef9ec39
RD		 35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/string.h>
40#include <linux/parser.h>
41#include <linux/random.h>
de25968c 42#include <linux/jiffies.h>
aef9ec39 43
60063497 44#include <linux/atomic.h>
aef9ec39
RD		 45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/srp.h>
3236822b 50#include <scsi/scsi_transport_srp.h>
aef9ec39 51
aef9ec39
RD		 52#include "ib_srp.h"
53
54#define DRV_NAME "ib_srp"
55#define PFX DRV_NAME ": "
56#define DRV_VERSION "0.2"
57#define DRV_RELDATE "November 1, 2005"
58
59MODULE_AUTHOR("Roland Dreier");
60MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
61 "v" DRV_VERSION " (" DRV_RELDATE ")");
62MODULE_LICENSE("Dual BSD/GPL");
63
49248644
DD		 64static unsigned int srp_sg_tablesize;
65static unsigned int cmd_sg_entries;
c07d424d
DD		 66static unsigned int indirect_sg_entries;
67static bool allow_ext_sg;
49248644 68static int topspin_workarounds = 1;
74b0a15b 69
49248644
DD		 70module_param(srp_sg_tablesize, uint, 0444);
71MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
74b0a15b 72
49248644
DD		 73module_param(cmd_sg_entries, uint, 0444);
74MODULE_PARM_DESC(cmd_sg_entries,
75 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
aef9ec39 76
c07d424d
DD		 77module_param(indirect_sg_entries, uint, 0444);
78MODULE_PARM_DESC(indirect_sg_entries,
79 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
80
81module_param(allow_ext_sg, bool, 0444);
82MODULE_PARM_DESC(allow_ext_sg,
83 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
84
aef9ec39
RD		 85module_param(topspin_workarounds, int, 0444);
86MODULE_PARM_DESC(topspin_workarounds,
87 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
88
aef9ec39
RD		 89static void srp_add_one(struct ib_device *device);
90static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 91static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
92static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 93static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
94
3236822b
FT		 95static struct scsi_transport_template *ib_srp_transport_template;
96
aef9ec39
RD		 97static struct ib_client srp_client = {
98 .name = "srp",
99 .add = srp_add_one,
100 .remove = srp_remove_one
101};
102
c1a0b23b
MT		 103static struct ib_sa_client srp_sa_client;
104
aef9ec39
RD		 105static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
106{
107 return (struct srp_target_port *) host->hostdata;
108}
109
110static const char *srp_target_info(struct Scsi_Host *host)
111{
112 return host_to_target(host)->target_name;
113}
114
5d7cbfd6
RD		 115static int srp_target_is_topspin(struct srp_target_port *target)
116{
117 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 118 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 119
120 return topspin_workarounds &&
3d1ff48d
RK		 121 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
122 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 123}
124
aef9ec39
RD		 125static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
126 gfp_t gfp_mask,
127 enum dma_data_direction direction)
128{
129 struct srp_iu *iu;
130
131 iu = kmalloc(sizeof *iu, gfp_mask);
132 if (!iu)
133 goto out;
134
135 iu->buf = kzalloc(size, gfp_mask);
136 if (!iu->buf)
137 goto out_free_iu;
138
05321937
GKH		 139 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
140 direction);
141 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 142 goto out_free_buf;
143
144 iu->size = size;
145 iu->direction = direction;
146
147 return iu;
148
149out_free_buf:
150 kfree(iu->buf);
151out_free_iu:
152 kfree(iu);
153out:
154 return NULL;
155}
156
157static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
158{
159 if (!iu)
160 return;
161
05321937
GKH		 162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
163 iu->direction);
aef9ec39
RD		 164 kfree(iu->buf);
165 kfree(iu);
166}
167
168static void srp_qp_event(struct ib_event *event, void *context)
169{
e0bda7d8 170 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 171}
172
173static int srp_init_qp(struct srp_target_port *target,
174 struct ib_qp *qp)
175{
176 struct ib_qp_attr *attr;
177 int ret;
178
179 attr = kmalloc(sizeof *attr, GFP_KERNEL);
180 if (!attr)
181 return -ENOMEM;
182
969a60f9
RD		 183 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
184 target->srp_host->port,
185 be16_to_cpu(target->path.pkey),
186 &attr->pkey_index);
aef9ec39
RD		 187 if (ret)
188 goto out;
189
190 attr->qp_state = IB_QPS_INIT;
191 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
192 IB_ACCESS_REMOTE_WRITE);
193 attr->port_num = target->srp_host->port;
194
195 ret = ib_modify_qp(qp, attr,
196 IB_QP_STATE |
197 IB_QP_PKEY_INDEX |
198 IB_QP_ACCESS_FLAGS |
199 IB_QP_PORT);
200
201out:
202 kfree(attr);
203 return ret;
204}
205
9fe4bcf4
DD		 206static int srp_new_cm_id(struct srp_target_port *target)
207{
208 struct ib_cm_id *new_cm_id;
209
05321937 210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 211 srp_cm_handler, target);
212 if (IS_ERR(new_cm_id))
213 return PTR_ERR(new_cm_id);
214
215 if (target->cm_id)
216 ib_destroy_cm_id(target->cm_id);
217 target->cm_id = new_cm_id;
218
219 return 0;
220}
221
aef9ec39
RD		 222static int srp_create_target_ib(struct srp_target_port *target)
223{
224 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 225 struct ib_cq *recv_cq, *send_cq;
226 struct ib_qp *qp;
aef9ec39
RD		 227 int ret;
228
229 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
230 if (!init_attr)
231 return -ENOMEM;
232
73aa89ed
IR		 233 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
234 srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
235 if (IS_ERR(recv_cq)) {
236 ret = PTR_ERR(recv_cq);
da9d2f07 237 goto err;
aef9ec39
RD		 238 }
239
73aa89ed
IR		 240 send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
241 srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
242 if (IS_ERR(send_cq)) {
243 ret = PTR_ERR(send_cq);
da9d2f07 244 goto err_recv_cq;
9c03dc9f
BVA		 245 }
246
73aa89ed 247 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 248
249 init_attr->event_handler = srp_qp_event;
250 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
251 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
252 init_attr->cap.max_recv_sge = 1;
253 init_attr->cap.max_send_sge = 1;
254 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
255 init_attr->qp_type = IB_QPT_RC;
73aa89ed
IR		 256 init_attr->send_cq = send_cq;
257 init_attr->recv_cq = recv_cq;
aef9ec39 258
73aa89ed
IR		 259 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
260 if (IS_ERR(qp)) {
261 ret = PTR_ERR(qp);
da9d2f07 262 goto err_send_cq;
aef9ec39
RD		 263 }
264
73aa89ed 265 ret = srp_init_qp(target, qp);
da9d2f07
RD		 266 if (ret)
267 goto err_qp;
aef9ec39 268
73aa89ed
IR		 269 if (target->qp)
270 ib_destroy_qp(target->qp);
271 if (target->recv_cq)
272 ib_destroy_cq(target->recv_cq);
273 if (target->send_cq)
274 ib_destroy_cq(target->send_cq);
275
276 target->qp = qp;
277 target->recv_cq = recv_cq;
278 target->send_cq = send_cq;
279
da9d2f07
RD		 280 kfree(init_attr);
281 return 0;
282
283err_qp:
73aa89ed 284 ib_destroy_qp(qp);
da9d2f07
RD		 285
286err_send_cq:
73aa89ed 287 ib_destroy_cq(send_cq);
da9d2f07
RD		 288
289err_recv_cq:
73aa89ed 290 ib_destroy_cq(recv_cq);
da9d2f07
RD		 291
292err:
aef9ec39
RD		 293 kfree(init_attr);
294 return ret;
295}
296
297static void srp_free_target_ib(struct srp_target_port *target)
298{
299 int i;
300
301 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 302 ib_destroy_cq(target->send_cq);
303 ib_destroy_cq(target->recv_cq);
aef9ec39 304
73aa89ed
IR		 305 target->qp = NULL;
306 target->send_cq = target->recv_cq = NULL;
307
aef9ec39
RD		 308 for (i = 0; i < SRP_RQ_SIZE; ++i)
309 srp_free_iu(target->srp_host, target->rx_ring[i]);
dd5e6e38 310 for (i = 0; i < SRP_SQ_SIZE; ++i)
aef9ec39
RD		 311 srp_free_iu(target->srp_host, target->tx_ring[i]);
312}
313
314static void srp_path_rec_completion(int status,
315 struct ib_sa_path_rec *pathrec,
316 void *target_ptr)
317{
318 struct srp_target_port *target = target_ptr;
319
320 target->status = status;
321 if (status)
7aa54bd7
DD		 322 shost_printk(KERN_ERR, target->scsi_host,
323 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 324 else
325 target->path = *pathrec;
326 complete(&target->done);
327}
328
329static int srp_lookup_path(struct srp_target_port *target)
330{
331 target->path.numb_path = 1;
332
333 init_completion(&target->done);
334
c1a0b23b 335 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 336 target->srp_host->srp_dev->dev,
aef9ec39
RD		 337 target->srp_host->port,
338 &target->path,
247e020e 339 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 340 IB_SA_PATH_REC_DGID |
341 IB_SA_PATH_REC_SGID |
342 IB_SA_PATH_REC_NUMB_PATH |
343 IB_SA_PATH_REC_PKEY,
344 SRP_PATH_REC_TIMEOUT_MS,
345 GFP_KERNEL,
346 srp_path_rec_completion,
347 target, &target->path_query);
348 if (target->path_query_id < 0)
349 return target->path_query_id;
350
351 wait_for_completion(&target->done);
352
353 if (target->status < 0)
7aa54bd7
DD		 354 shost_printk(KERN_WARNING, target->scsi_host,
355 PFX "Path record query failed\n");
aef9ec39
RD		 356
357 return target->status;
358}
359
360static int srp_send_req(struct srp_target_port *target)
361{
362 struct {
363 struct ib_cm_req_param param;
364 struct srp_login_req priv;
365 } *req = NULL;
366 int status;
367
368 req = kzalloc(sizeof *req, GFP_KERNEL);
369 if (!req)
370 return -ENOMEM;
371
372 req->param.primary_path = &target->path;
373 req->param.alternate_path = NULL;
374 req->param.service_id = target->service_id;
375 req->param.qp_num = target->qp->qp_num;
376 req->param.qp_type = target->qp->qp_type;
377 req->param.private_data = &req->priv;
378 req->param.private_data_len = sizeof req->priv;
379 req->param.flow_control = 1;
380
381 get_random_bytes(&req->param.starting_psn, 4);
382 req->param.starting_psn &= 0xffffff;
383
384 /*
385 * Pick some arbitrary defaults here; we could make these
386 * module parameters if anyone cared about setting them.
387 */
388 req->param.responder_resources = 4;
389 req->param.remote_cm_response_timeout = 20;
390 req->param.local_cm_response_timeout = 20;
391 req->param.retry_count = 7;
392 req->param.rnr_retry_count = 7;
393 req->param.max_cm_retries = 15;
394
395 req->priv.opcode = SRP_LOGIN_REQ;
396 req->priv.tag = 0;
49248644 397 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 398 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
399 SRP_BUF_FORMAT_INDIRECT);
0c0450db 400 /*
3cd96564 401 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 402 * port identifier format is 8 bytes of ID extension followed
403 * by 8 bytes of GUID. Older drafts put the two halves in the
404 * opposite order, so that the GUID comes first.
405 *
406 * Targets conforming to these obsolete drafts can be
407 * recognized by the I/O Class they report.
408 */
409 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
410 memcpy(req->priv.initiator_port_id,
01cb9bcb 411 &target->path.sgid.global.interface_id, 8);
0c0450db 412 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 413 &target->initiator_ext, 8);
0c0450db
R		 414 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
415 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
416 } else {
417 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 418 &target->initiator_ext, 8);
419 memcpy(req->priv.initiator_port_id + 8,
420 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 421 memcpy(req->priv.target_port_id, &target->id_ext, 8);
422 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
423 }
424
aef9ec39
RD		 425 /*
426 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 427 * zero out the first 8 bytes of our initiator port ID and set
428 * the second 8 bytes to the local node GUID.
aef9ec39 429 */
5d7cbfd6 430 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 431 shost_printk(KERN_DEBUG, target->scsi_host,
432 PFX "Topspin/Cisco initiator port ID workaround "
433 "activated for target GUID %016llx\n",
434 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 435 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 436 memcpy(req->priv.initiator_port_id + 8,
05321937 437 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 438 }
aef9ec39
RD		 439
440 status = ib_send_cm_req(target->cm_id, &req->param);
441
442 kfree(req);
443
444 return status;
445}
446
ef6c49d8
BVA		 447static bool srp_queue_remove_work(struct srp_target_port *target)
448{
449 bool changed = false;
450
451 spin_lock_irq(&target->lock);
452 if (target->state != SRP_TARGET_REMOVED) {
453 target->state = SRP_TARGET_REMOVED;
454 changed = true;
455 }
456 spin_unlock_irq(&target->lock);
457
458 if (changed)
459 queue_work(system_long_wq, &target->remove_work);
460
461 return changed;
462}
463
294c875a
BVA		 464static bool srp_change_conn_state(struct srp_target_port *target,
465 bool connected)
466{
467 bool changed = false;
468
469 spin_lock_irq(&target->lock);
470 if (target->connected != connected) {
471 target->connected = connected;
472 changed = true;
473 }
474 spin_unlock_irq(&target->lock);
475
476 return changed;
477}
478
aef9ec39
RD		 479static void srp_disconnect_target(struct srp_target_port *target)
480{
294c875a
BVA		 481 if (srp_change_conn_state(target, false)) {
482 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 483
294c875a
BVA		 484 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
485 shost_printk(KERN_DEBUG, target->scsi_host,
486 PFX "Sending CM DREQ failed\n");
294c875a 487 }
e6581056 488 }
aef9ec39
RD		 489}
490
8f26c9ff
DD		 491static void srp_free_req_data(struct srp_target_port *target)
492{
c07d424d 493 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
8f26c9ff
DD		 494 struct srp_request *req;
495 int i;
496
497 for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
498 kfree(req->fmr_list);
499 kfree(req->map_page);
c07d424d
DD		 500 if (req->indirect_dma_addr) {
501 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
502 target->indirect_size,
503 DMA_TO_DEVICE);
504 }
505 kfree(req->indirect_desc);
8f26c9ff
DD		 506 }
507}
508
683b159a
BVA		 509/**
510 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
511 * @shost: SCSI host whose attributes to remove from sysfs.
512 *
513 * Note: Any attributes defined in the host template and that did not exist
514 * before invocation of this function will be ignored.
515 */
516static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
517{
518 struct device_attribute **attr;
519
520 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
521 device_remove_file(&shost->shost_dev, *attr);
522}
523
ee12d6a8
BVA		 524static void srp_remove_target(struct srp_target_port *target)
525{
ef6c49d8
BVA		 526 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
527
ee12d6a8
BVA		 528 srp_del_scsi_host_attr(target->scsi_host);
529 srp_remove_host(target->scsi_host);
530 scsi_remove_host(target->scsi_host);
ef6c49d8 531 srp_disconnect_target(target);
ee12d6a8
BVA		 532 ib_destroy_cm_id(target->cm_id);
533 srp_free_target_ib(target);
534 srp_free_req_data(target);
535 scsi_host_put(target->scsi_host);
536}
537
c4028958 538static void srp_remove_work(struct work_struct *work)
aef9ec39 539{
c4028958 540 struct srp_target_port *target =
ef6c49d8 541 container_of(work, struct srp_target_port, remove_work);
aef9ec39 542
ef6c49d8 543 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 544
b3589fd4 545 spin_lock(&target->srp_host->target_lock);
aef9ec39 546 list_del(&target->list);
b3589fd4 547 spin_unlock(&target->srp_host->target_lock);
aef9ec39 548
ee12d6a8 549 srp_remove_target(target);
aef9ec39
RD		 550}
551
dc1bdbd9
BVA		 552static void srp_rport_delete(struct srp_rport *rport)
553{
554 struct srp_target_port *target = rport->lld_data;
555
556 srp_queue_remove_work(target);
557}
558
aef9ec39
RD		 559static int srp_connect_target(struct srp_target_port *target)
560{
9fe4bcf4 561 int retries = 3;
aef9ec39
RD		 562 int ret;
563
294c875a
BVA		 564 WARN_ON_ONCE(target->connected);
565
948d1e88
BVA		 566 target->qp_in_error = false;
567
aef9ec39
RD		 568 ret = srp_lookup_path(target);
569 if (ret)
570 return ret;
571
572 while (1) {
573 init_completion(&target->done);
574 ret = srp_send_req(target);
575 if (ret)
576 return ret;
577 wait_for_completion(&target->done);
578
579 /*
580 * The CM event handling code will set status to
581 * SRP_PORT_REDIRECT if we get a port redirect REJ
582 * back, or SRP_DLID_REDIRECT if we get a lid/qp
583 * redirect REJ back.
584 */
585 switch (target->status) {
586 case 0:
294c875a 587 srp_change_conn_state(target, true);
aef9ec39
RD		 588 return 0;
589
590 case SRP_PORT_REDIRECT:
591 ret = srp_lookup_path(target);
592 if (ret)
593 return ret;
594 break;
595
596 case SRP_DLID_REDIRECT:
597 break;
598
9fe4bcf4
DD		 599 case SRP_STALE_CONN:
600 /* Our current CM id was stale, and is now in timewait.
601 * Try to reconnect with a new one.
602 */
603 if (!retries-- || srp_new_cm_id(target)) {
604 shost_printk(KERN_ERR, target->scsi_host, PFX
605 "giving up on stale connection\n");
606 target->status = -ECONNRESET;
607 return target->status;
608 }
609
610 shost_printk(KERN_ERR, target->scsi_host, PFX
611 "retrying stale connection\n");
612 break;
613
aef9ec39
RD		 614 default:
615 return target->status;
616 }
617 }
618}
619
d945e1df
RD		 620static void srp_unmap_data(struct scsi_cmnd *scmnd,
621 struct srp_target_port *target,
622 struct srp_request *req)
623{
8f26c9ff
DD		 624 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
625 struct ib_pool_fmr **pfmr;
626
bb350d1d 627 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 628 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
629 scmnd->sc_data_direction != DMA_FROM_DEVICE))
630 return;
631
8f26c9ff
DD		 632 pfmr = req->fmr_list;
633 while (req->nfmr--)
634 ib_fmr_pool_unmap(*pfmr++);
f5358a17 635
8f26c9ff
DD		 636 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
637 scmnd->sc_data_direction);
d945e1df
RD		 638}
639
22032991
BVA		 640/**
641 * srp_claim_req - Take ownership of the scmnd associated with a request.
642 * @target: SRP target port.
643 * @req: SRP request.
644 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
645 * ownership of @req->scmnd if it equals @scmnd.
646 *
647 * Return value:
648 * Either NULL or a pointer to the SCSI command the caller became owner of.
649 */
650static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
651 struct srp_request *req,
652 struct scsi_cmnd *scmnd)
653{
654 unsigned long flags;
655
656 spin_lock_irqsave(&target->lock, flags);
657 if (!scmnd) {
658 scmnd = req->scmnd;
659 req->scmnd = NULL;
660 } else if (req->scmnd == scmnd) {
661 req->scmnd = NULL;
662 } else {
663 scmnd = NULL;
664 }
665 spin_unlock_irqrestore(&target->lock, flags);
666
667 return scmnd;
668}
669
670/**
671 * srp_free_req() - Unmap data and add request to the free request list.
672 */
673static void srp_free_req(struct srp_target_port *target,
674 struct srp_request *req, struct scsi_cmnd *scmnd,
675 s32 req_lim_delta)
526b4caa 676{
94a9174c
BVA		 677 unsigned long flags;
678
22032991
BVA		 679 srp_unmap_data(scmnd, target, req);
680
e9684678 681 spin_lock_irqsave(&target->lock, flags);
94a9174c 682 target->req_lim += req_lim_delta;
536ae14e 683 list_add_tail(&req->list, &target->free_reqs);
e9684678 684 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 685}
686
687static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
688{
22032991
BVA		 689 struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
690
691 if (scmnd) {
9b796d06 692 srp_free_req(target, req, scmnd, 0);
22032991
BVA		 693 scmnd->result = DID_RESET << 16;
694 scmnd->scsi_done(scmnd);
22032991 695 }
526b4caa
IR		 696}
697
aef9ec39
RD		 698static int srp_reconnect_target(struct srp_target_port *target)
699{
09be70a2 700 struct Scsi_Host *shost = target->scsi_host;
dcb4cb85 701 int i, ret;
aef9ec39 702
09be70a2
BVA		 703 scsi_target_block(&shost->shost_gendev);
704
aef9ec39
RD		 705 srp_disconnect_target(target);
706 /*
c7c4e7ff
BVA		 707 * Now get a new local CM ID so that we avoid confusing the target in
708 * case things are really fouled up. Doing so also ensures that all CM
709 * callbacks will have finished before a new QP is allocated.
aef9ec39 710 */
9fe4bcf4 711 ret = srp_new_cm_id(target);
c7c4e7ff
BVA		 712 /*
713 * Whether or not creating a new CM ID succeeded, create a new
714 * QP. This guarantees that all completion callback function
715 * invocations have finished before request resetting starts.
716 */
717 if (ret == 0)
718 ret = srp_create_target_ib(target);
719 else
720 srp_create_target_ib(target);
aef9ec39 721
536ae14e
BVA		 722 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
723 struct srp_request *req = &target->req_ring[i];
724 if (req->scmnd)
725 srp_reset_req(target, req);
726 }
aef9ec39 727
536ae14e 728 INIT_LIST_HEAD(&target->free_tx);
dcb4cb85 729 for (i = 0; i < SRP_SQ_SIZE; ++i)
536ae14e 730 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39 731
c7c4e7ff
BVA		 732 if (ret == 0)
733 ret = srp_connect_target(target);
09be70a2 734
09be70a2
BVA		 735 scsi_target_unblock(&shost->shost_gendev, ret == 0 ? SDEV_RUNNING :
736 SDEV_TRANSPORT_OFFLINE);
2ce19e72 737 target->transport_offline = !!ret;
09be70a2 738
aef9ec39
RD		 739 if (ret)
740 goto err;
741
09be70a2 742 shost_printk(KERN_INFO, target->scsi_host, PFX "reconnect succeeded\n");
aef9ec39
RD		 743
744 return ret;
745
746err:
7aa54bd7
DD		 747 shost_printk(KERN_ERR, target->scsi_host,
748 PFX "reconnect failed (%d), removing target port.\n", ret);
aef9ec39
RD		 749
750 /*
751 * We couldn't reconnect, so kill our target port off.
9709f0e0
BVA		 752 * However, we have to defer the real removal because we
753 * are in the context of the SCSI error handler now, which
754 * will deadlock if we call scsi_remove_host().
aef9ec39 755 */
ef6c49d8 756 srp_queue_remove_work(target);
aef9ec39
RD		 757
758 return ret;
759}
760
8f26c9ff
DD		 761static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
762 unsigned int dma_len, u32 rkey)
f5358a17 763{
8f26c9ff 764 struct srp_direct_buf *desc = state->desc;
f5358a17 765
8f26c9ff
DD		 766 desc->va = cpu_to_be64(dma_addr);
767 desc->key = cpu_to_be32(rkey);
768 desc->len = cpu_to_be32(dma_len);
f5358a17 769
8f26c9ff
DD		 770 state->total_len += dma_len;
771 state->desc++;
772 state->ndesc++;
773}
559ce8f1 774
8f26c9ff
DD		 775static int srp_map_finish_fmr(struct srp_map_state *state,
776 struct srp_target_port *target)
777{
778 struct srp_device *dev = target->srp_host->srp_dev;
779 struct ib_pool_fmr *fmr;
780 u64 io_addr = 0;
85507bcc 781
8f26c9ff
DD		 782 if (!state->npages)
783 return 0;
f5358a17 784
8f26c9ff
DD		 785 if (state->npages == 1) {
786 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
787 target->rkey);
788 state->npages = state->fmr_len = 0;
789 return 0;
f5358a17
RD		 790 }
791
8f26c9ff
DD		 792 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
793 state->npages, io_addr);
794 if (IS_ERR(fmr))
795 return PTR_ERR(fmr);
f5358a17 796
8f26c9ff
DD		 797 *state->next_fmr++ = fmr;
798 state->nfmr++;
f5358a17 799
8f26c9ff
DD		 800 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
801 state->npages = state->fmr_len = 0;
802 return 0;
803}
804
805static void srp_map_update_start(struct srp_map_state *state,
806 struct scatterlist *sg, int sg_index,
807 dma_addr_t dma_addr)
808{
809 state->unmapped_sg = sg;
810 state->unmapped_index = sg_index;
811 state->unmapped_addr = dma_addr;
812}
85507bcc 813
8f26c9ff
DD		 814static int srp_map_sg_entry(struct srp_map_state *state,
815 struct srp_target_port *target,
816 struct scatterlist *sg, int sg_index,
817 int use_fmr)
818{
819 struct srp_device *dev = target->srp_host->srp_dev;
820 struct ib_device *ibdev = dev->dev;
821 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
822 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
823 unsigned int len;
824 int ret;
825
826 if (!dma_len)
827 return 0;
828
829 if (use_fmr == SRP_MAP_NO_FMR) {
830 /* Once we're in direct map mode for a request, we don't
831 * go back to FMR mode, so no need to update anything
832 * other than the descriptor.
833 */
834 srp_map_desc(state, dma_addr, dma_len, target->rkey);
835 return 0;
85507bcc 836 }
f5358a17 837
8f26c9ff
DD		 838 /* If we start at an offset into the FMR page, don't merge into
839 * the current FMR. Finish it out, and use the kernel's MR for this
840 * sg entry. This is to avoid potential bugs on some SRP targets
841 * that were never quite defined, but went away when the initiator
842 * avoided using FMR on such page fragments.
843 */
844 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
845 ret = srp_map_finish_fmr(state, target);
846 if (ret)
847 return ret;
848
849 srp_map_desc(state, dma_addr, dma_len, target->rkey);
850 srp_map_update_start(state, NULL, 0, 0);
851 return 0;
f5358a17
RD		 852 }
853
8f26c9ff
DD		 854 /* If this is the first sg to go into the FMR, save our position.
855 * We need to know the first unmapped entry, its index, and the
856 * first unmapped address within that entry to be able to restart
857 * mapping after an error.
858 */
859 if (!state->unmapped_sg)
860 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 861
8f26c9ff
DD		 862 while (dma_len) {
863 if (state->npages == SRP_FMR_SIZE) {
864 ret = srp_map_finish_fmr(state, target);
865 if (ret)
866 return ret;
f5358a17 867
8f26c9ff
DD		 868 srp_map_update_start(state, sg, sg_index, dma_addr);
869 }
870
871 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
f5358a17 872
8f26c9ff
DD		 873 if (!state->npages)
874 state->base_dma_addr = dma_addr;
875 state->pages[state->npages++] = dma_addr;
876 state->fmr_len += len;
877 dma_addr += len;
878 dma_len -= len;
879 }
880
881 /* If the last entry of the FMR wasn't a full page, then we need to
882 * close it out and start a new one -- we can only merge at page
883 * boundries.
884 */
885 ret = 0;
886 if (len != dev->fmr_page_size) {
887 ret = srp_map_finish_fmr(state, target);
888 if (!ret)
889 srp_map_update_start(state, NULL, 0, 0);
890 }
f5358a17
RD		 891 return ret;
892}
893
aef9ec39
RD		 894static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
895 struct srp_request *req)
896{
8f26c9ff 897 struct scatterlist *scat, *sg;
aef9ec39 898 struct srp_cmd *cmd = req->cmd->buf;
8f26c9ff 899 int i, len, nents, count, use_fmr;
85507bcc
RC		 900 struct srp_device *dev;
901 struct ib_device *ibdev;
8f26c9ff
DD		 902 struct srp_map_state state;
903 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 904 u32 table_len;
905 u8 fmt;
aef9ec39 906
bb350d1d 907 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 908 return sizeof (struct srp_cmd);
909
910 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
911 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 912 shost_printk(KERN_WARNING, target->scsi_host,
913 PFX "Unhandled data direction %d\n",
914 scmnd->sc_data_direction);
aef9ec39
RD		 915 return -EINVAL;
916 }
917
bb350d1d
FT		 918 nents = scsi_sg_count(scmnd);
919 scat = scsi_sglist(scmnd);
aef9ec39 920
05321937 921 dev = target->srp_host->srp_dev;
85507bcc
RC		 922 ibdev = dev->dev;
923
924 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 925 if (unlikely(count == 0))
926 return -EIO;
f5358a17
RD		 927
928 fmt = SRP_DATA_DESC_DIRECT;
929 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 930
cf368713 931 if (count == 1) {
f5358a17
RD		 932 /*
933 * The midlayer only generated a single gather/scatter
934 * entry, or DMA mapping coalesced everything to a
935 * single entry. So a direct descriptor along with
936 * the DMA MR suffices.
937 */
cf368713 938 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 939
85507bcc 940 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 941 buf->key = cpu_to_be32(target->rkey);
85507bcc 942 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff
DD		 943
944 req->nfmr = 0;
945 goto map_complete;
946 }
947
948 /* We have more than one scatter/gather entry, so build our indirect
949 * descriptor table, trying to merge as many entries with FMR as we
950 * can.
951 */
952 indirect_hdr = (void *) cmd->add_data;
953
c07d424d
DD		 954 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
955 target->indirect_size, DMA_TO_DEVICE);
956
8f26c9ff 957 memset(&state, 0, sizeof(state));
c07d424d 958 state.desc = req->indirect_desc;
8f26c9ff
DD		 959 state.pages = req->map_page;
960 state.next_fmr = req->fmr_list;
961
962 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
963
964 for_each_sg(scat, sg, count, i) {
965 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
966 /* FMR mapping failed, so backtrack to the first
967 * unmapped entry and continue on without using FMR.
968 */
969 dma_addr_t dma_addr;
970 unsigned int dma_len;
971
972backtrack:
973 sg = state.unmapped_sg;
974 i = state.unmapped_index;
975
976 dma_addr = ib_sg_dma_address(ibdev, sg);
977 dma_len = ib_sg_dma_len(ibdev, sg);
978 dma_len -= (state.unmapped_addr - dma_addr);
979 dma_addr = state.unmapped_addr;
980 use_fmr = SRP_MAP_NO_FMR;
981 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
f5358a17 982 }
8f26c9ff 983 }
aef9ec39 984
8f26c9ff
DD		 985 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
986 goto backtrack;
cf368713 987
c07d424d
DD		 988 /* We've mapped the request, now pull as much of the indirect
989 * descriptor table as we can into the command buffer. If this
990 * target is not using an external indirect table, we are
991 * guaranteed to fit into the command, as the SCSI layer won't
992 * give us more S/G entries than we allow.
8f26c9ff
DD		 993 */
994 req->nfmr = state.nfmr;
995 if (state.ndesc == 1) {
996 /* FMR mapping was able to collapse this to one entry,
997 * so use a direct descriptor.
998 */
999 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 1000
c07d424d 1001 *buf = req->indirect_desc[0];
8f26c9ff 1002 goto map_complete;
aef9ec39
RD		 1003 }
1004
c07d424d
DD		 1005 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1006 !target->allow_ext_sg)) {
1007 shost_printk(KERN_ERR, target->scsi_host,
1008 "Could not fit S/G list into SRP_CMD\n");
1009 return -EIO;
1010 }
1011
1012 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1013 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1014
1015 fmt = SRP_DATA_DESC_INDIRECT;
1016 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1017 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1018
c07d424d
DD		 1019 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1020 count * sizeof (struct srp_direct_buf));
8f26c9ff 1021
c07d424d 1022 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1023 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1024 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1025 indirect_hdr->len = cpu_to_be32(state.total_len);
1026
1027 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1028 cmd->data_out_desc_cnt = count;
8f26c9ff 1029 else
c07d424d
DD		 1030 cmd->data_in_desc_cnt = count;
1031
1032 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1033 DMA_TO_DEVICE);
8f26c9ff
DD		 1034
1035map_complete:
aef9ec39
RD		 1036 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1037 cmd->buf_fmt = fmt << 4;
1038 else
1039 cmd->buf_fmt = fmt;
1040
aef9ec39
RD		 1041 return len;
1042}
1043
76c75b25
BVA		 1044/*
1045 * Return an IU and possible credit to the free pool
1046 */
1047static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1048 enum srp_iu_type iu_type)
1049{
1050 unsigned long flags;
1051
e9684678 1052 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1053 list_add(&iu->list, &target->free_tx);
1054 if (iu_type != SRP_IU_RSP)
1055 ++target->req_lim;
e9684678 1056 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1057}
1058
05a1d750 1059/*
e9684678
BVA		 1060 * Must be called with target->lock held to protect req_lim and free_tx.
1061 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1062 *
1063 * Note:
1064 * An upper limit for the number of allocated information units for each
1065 * request type is:
1066 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1067 * more than Scsi_Host.can_queue requests.
1068 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1069 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1070 * one unanswered SRP request to an initiator.
1071 */
1072static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1073 enum srp_iu_type iu_type)
1074{
1075 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1076 struct srp_iu *iu;
1077
1078 srp_send_completion(target->send_cq, target);
1079
dcb4cb85 1080 if (list_empty(&target->free_tx))
05a1d750
DD		 1081 return NULL;
1082
1083 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1084 if (iu_type != SRP_IU_RSP) {
1085 if (target->req_lim <= rsv) {
1086 ++target->zero_req_lim;
1087 return NULL;
1088 }
1089
1090 --target->req_lim;
05a1d750
DD		 1091 }
1092
dcb4cb85 1093 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1094 list_del(&iu->list);
05a1d750
DD		 1095 return iu;
1096}
1097
76c75b25
BVA		 1098static int srp_post_send(struct srp_target_port *target,
1099 struct srp_iu *iu, int len)
05a1d750
DD		 1100{
1101 struct ib_sge list;
1102 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1103
1104 list.addr = iu->dma;
1105 list.length = len;
9af76271 1106 list.lkey = target->lkey;
05a1d750
DD		 1107
1108 wr.next = NULL;
dcb4cb85 1109 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1110 wr.sg_list = &list;
1111 wr.num_sge = 1;
1112 wr.opcode = IB_WR_SEND;
1113 wr.send_flags = IB_SEND_SIGNALED;
1114
76c75b25 1115 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1116}
1117
dcb4cb85 1118static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1119{
c996bb47 1120 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1121 struct ib_sge list;
c996bb47
BVA		 1122
1123 list.addr = iu->dma;
1124 list.length = iu->size;
9af76271 1125 list.lkey = target->lkey;
c996bb47
BVA		 1126
1127 wr.next = NULL;
dcb4cb85 1128 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1129 wr.sg_list = &list;
1130 wr.num_sge = 1;
1131
dcb4cb85 1132 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1133}
1134
aef9ec39
RD		 1135static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1136{
1137 struct srp_request *req;
1138 struct scsi_cmnd *scmnd;
1139 unsigned long flags;
aef9ec39 1140
aef9ec39 1141 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1142 spin_lock_irqsave(&target->lock, flags);
94a9174c 1143 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1144 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1145
f8b6e31e
DD		 1146 target->tsk_mgmt_status = -1;
1147 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1148 target->tsk_mgmt_status = rsp->data[3];
1149 complete(&target->tsk_mgmt_done);
aef9ec39 1150 } else {
f8b6e31e 1151 req = &target->req_ring[rsp->tag];
22032991
BVA		 1152 scmnd = srp_claim_req(target, req, NULL);
1153 if (!scmnd) {
7aa54bd7
DD		 1154 shost_printk(KERN_ERR, target->scsi_host,
1155 "Null scmnd for RSP w/tag %016llx\n",
1156 (unsigned long long) rsp->tag);
22032991
BVA		 1157
1158 spin_lock_irqsave(&target->lock, flags);
1159 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1160 spin_unlock_irqrestore(&target->lock, flags);
1161
1162 return;
1163 }
aef9ec39
RD		 1164 scmnd->result = rsp->status;
1165
1166 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1167 memcpy(scmnd->sense_buffer, rsp->data +
1168 be32_to_cpu(rsp->resp_data_len),
1169 min_t(int, be32_to_cpu(rsp->sense_data_len),
1170 SCSI_SENSE_BUFFERSIZE));
1171 }
1172
1173 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1174 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1175 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1176 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1177
22032991
BVA		 1178 srp_free_req(target, req, scmnd,
1179 be32_to_cpu(rsp->req_lim_delta));
1180
f8b6e31e
DD		 1181 scmnd->host_scribble = NULL;
1182 scmnd->scsi_done(scmnd);
aef9ec39 1183 }
aef9ec39
RD		 1184}
1185
bb12588a
DD		 1186static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1187 void *rsp, int len)
1188{
76c75b25 1189 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1190 unsigned long flags;
1191 struct srp_iu *iu;
76c75b25 1192 int err;
bb12588a 1193
e9684678 1194 spin_lock_irqsave(&target->lock, flags);
bb12588a 1195 target->req_lim += req_delta;
bb12588a 1196 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1197 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1198
bb12588a
DD		 1199 if (!iu) {
1200 shost_printk(KERN_ERR, target->scsi_host, PFX
1201 "no IU available to send response\n");
76c75b25 1202 return 1;
bb12588a
DD		 1203 }
1204
1205 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1206 memcpy(iu->buf, rsp, len);
1207 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1208
76c75b25
BVA		 1209 err = srp_post_send(target, iu, len);
1210 if (err) {
bb12588a
DD		 1211 shost_printk(KERN_ERR, target->scsi_host, PFX
1212 "unable to post response: %d\n", err);
76c75b25
BVA		 1213 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1214 }
bb12588a 1215
bb12588a
DD		 1216 return err;
1217}
1218
1219static void srp_process_cred_req(struct srp_target_port *target,
1220 struct srp_cred_req *req)
1221{
1222 struct srp_cred_rsp rsp = {
1223 .opcode = SRP_CRED_RSP,
1224 .tag = req->tag,
1225 };
1226 s32 delta = be32_to_cpu(req->req_lim_delta);
1227
1228 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1229 shost_printk(KERN_ERR, target->scsi_host, PFX
1230 "problems processing SRP_CRED_REQ\n");
1231}
1232
1233static void srp_process_aer_req(struct srp_target_port *target,
1234 struct srp_aer_req *req)
1235{
1236 struct srp_aer_rsp rsp = {
1237 .opcode = SRP_AER_RSP,
1238 .tag = req->tag,
1239 };
1240 s32 delta = be32_to_cpu(req->req_lim_delta);
1241
1242 shost_printk(KERN_ERR, target->scsi_host, PFX
1243 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1244
1245 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1246 shost_printk(KERN_ERR, target->scsi_host, PFX
1247 "problems processing SRP_AER_REQ\n");
1248}
1249
aef9ec39
RD		 1250static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1251{
dcb4cb85 1252 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1253 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1254 int res;
aef9ec39
RD		 1255 u8 opcode;
1256
85507bcc
RC		 1257 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1258 DMA_FROM_DEVICE);
aef9ec39
RD		 1259
1260 opcode = *(u8 *) iu->buf;
1261
1262 if (0) {
7aa54bd7
DD		 1263 shost_printk(KERN_ERR, target->scsi_host,
1264 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1265 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1266 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1267 }
1268
1269 switch (opcode) {
1270 case SRP_RSP:
1271 srp_process_rsp(target, iu->buf);
1272 break;
1273
bb12588a
DD		 1274 case SRP_CRED_REQ:
1275 srp_process_cred_req(target, iu->buf);
1276 break;
1277
1278 case SRP_AER_REQ:
1279 srp_process_aer_req(target, iu->buf);
1280 break;
1281
aef9ec39
RD		 1282 case SRP_T_LOGOUT:
1283 /* XXX Handle target logout */
7aa54bd7
DD		 1284 shost_printk(KERN_WARNING, target->scsi_host,
1285 PFX "Got target logout request\n");
aef9ec39
RD		 1286 break;
1287
1288 default:
7aa54bd7
DD		 1289 shost_printk(KERN_WARNING, target->scsi_host,
1290 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1291 break;
1292 }
1293
85507bcc
RC		 1294 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1295 DMA_FROM_DEVICE);
c996bb47 1296
dcb4cb85 1297 res = srp_post_recv(target, iu);
c996bb47
BVA		 1298 if (res != 0)
1299 shost_printk(KERN_ERR, target->scsi_host,
1300 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1301}
1302
948d1e88
BVA		 1303static void srp_handle_qp_err(enum ib_wc_status wc_status,
1304 enum ib_wc_opcode wc_opcode,
1305 struct srp_target_port *target)
1306{
294c875a 1307 if (target->connected && !target->qp_in_error) {
4f0af697
BVA		 1308 shost_printk(KERN_ERR, target->scsi_host,
1309 PFX "failed %s status %d\n",
1310 wc_opcode & IB_WC_RECV ? "receive" : "send",
1311 wc_status);
1312 }
948d1e88
BVA		 1313 target->qp_in_error = true;
1314}
1315
9c03dc9f 1316static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1317{
1318 struct srp_target_port *target = target_ptr;
1319 struct ib_wc wc;
aef9ec39
RD		 1320
1321 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1322 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1323 if (likely(wc.status == IB_WC_SUCCESS)) {
1324 srp_handle_recv(target, &wc);
1325 } else {
1326 srp_handle_qp_err(wc.status, wc.opcode, target);
aef9ec39 1327 }
9c03dc9f
BVA		 1328 }
1329}
1330
1331static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1332{
1333 struct srp_target_port *target = target_ptr;
1334 struct ib_wc wc;
dcb4cb85 1335 struct srp_iu *iu;
9c03dc9f
BVA		 1336
1337 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1338 if (likely(wc.status == IB_WC_SUCCESS)) {
1339 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1340 list_add(&iu->list, &target->free_tx);
1341 } else {
1342 srp_handle_qp_err(wc.status, wc.opcode, target);
9c03dc9f 1343 }
aef9ec39
RD		 1344 }
1345}
1346
76c75b25 1347static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1348{
76c75b25 1349 struct srp_target_port *target = host_to_target(shost);
aef9ec39
RD		 1350 struct srp_request *req;
1351 struct srp_iu *iu;
1352 struct srp_cmd *cmd;
85507bcc 1353 struct ib_device *dev;
76c75b25 1354 unsigned long flags;
aef9ec39
RD		 1355 int len;
1356
2ce19e72
BVA		 1357 if (unlikely(target->transport_offline)) {
1358 scmnd->result = DID_NO_CONNECT << 16;
1359 scmnd->scsi_done(scmnd);
1360 return 0;
1361 }
1362
e9684678 1363 spin_lock_irqsave(&target->lock, flags);
bb12588a 1364 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1365 if (!iu)
695b8349
BVA		 1366 goto err_unlock;
1367
1368 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1369 list_del(&req->list);
1370 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1371
05321937 1372 dev = target->srp_host->srp_dev->dev;
49248644 1373 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1374 DMA_TO_DEVICE);
aef9ec39 1375
aef9ec39 1376 scmnd->result = 0;
f8b6e31e 1377 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1378
1379 cmd = iu->buf;
1380 memset(cmd, 0, sizeof *cmd);
1381
1382 cmd->opcode = SRP_CMD;
1383 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1384 cmd->tag = req->index;
aef9ec39
RD		 1385 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1386
aef9ec39
RD		 1387 req->scmnd = scmnd;
1388 req->cmd = iu;
aef9ec39
RD		 1389
1390 len = srp_map_data(scmnd, target, req);
1391 if (len < 0) {
7aa54bd7
DD		 1392 shost_printk(KERN_ERR, target->scsi_host,
1393 PFX "Failed to map data\n");
76c75b25 1394 goto err_iu;
aef9ec39
RD		 1395 }
1396
49248644 1397 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1398 DMA_TO_DEVICE);
aef9ec39 1399
76c75b25 1400 if (srp_post_send(target, iu, len)) {
7aa54bd7 1401 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1402 goto err_unmap;
1403 }
1404
aef9ec39
RD		 1405 return 0;
1406
1407err_unmap:
1408 srp_unmap_data(scmnd, target, req);
1409
76c75b25
BVA		 1410err_iu:
1411 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1412
e9684678 1413 spin_lock_irqsave(&target->lock, flags);
76c75b25 1414 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1415
1416err_unlock:
e9684678 1417 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1418
aef9ec39
RD		 1419 return SCSI_MLQUEUE_HOST_BUSY;
1420}
1421
1422static int srp_alloc_iu_bufs(struct srp_target_port *target)
1423{
1424 int i;
1425
1426 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1427 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1428 target->max_ti_iu_len,
1429 GFP_KERNEL, DMA_FROM_DEVICE);
1430 if (!target->rx_ring[i])
1431 goto err;
1432 }
1433
dd5e6e38 1434 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39 1435 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1436 target->max_iu_len,
aef9ec39
RD		 1437 GFP_KERNEL, DMA_TO_DEVICE);
1438 if (!target->tx_ring[i])
1439 goto err;
dcb4cb85
BVA		 1440
1441 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1442 }
1443
1444 return 0;
1445
1446err:
1447 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1448 srp_free_iu(target->srp_host, target->rx_ring[i]);
1449 target->rx_ring[i] = NULL;
1450 }
1451
dd5e6e38 1452 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39
RD		 1453 srp_free_iu(target->srp_host, target->tx_ring[i]);
1454 target->tx_ring[i] = NULL;
1455 }
1456
1457 return -ENOMEM;
1458}
1459
c9b03c1a
BVA		 1460static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1461{
1462 uint64_t T_tr_ns, max_compl_time_ms;
1463 uint32_t rq_tmo_jiffies;
1464
1465 /*
1466 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1467 * table 91), both the QP timeout and the retry count have to be set
1468 * for RC QP's during the RTR to RTS transition.
1469 */
1470 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1471 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1472
1473 /*
1474 * Set target->rq_tmo_jiffies to one second more than the largest time
1475 * it can take before an error completion is generated. See also
1476 * C9-140..142 in the IBTA spec for more information about how to
1477 * convert the QP Local ACK Timeout value to nanoseconds.
1478 */
1479 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1480 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1481 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1482 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1483
1484 return rq_tmo_jiffies;
1485}
1486
961e0be8
DD		 1487static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1488 struct srp_login_rsp *lrsp,
1489 struct srp_target_port *target)
1490{
1491 struct ib_qp_attr *qp_attr = NULL;
1492 int attr_mask = 0;
1493 int ret;
1494 int i;
1495
1496 if (lrsp->opcode == SRP_LOGIN_RSP) {
1497 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1498 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1499
1500 /*
1501 * Reserve credits for task management so we don't
1502 * bounce requests back to the SCSI mid-layer.
1503 */
1504 target->scsi_host->can_queue
1505 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1506 target->scsi_host->can_queue);
1507 } else {
1508 shost_printk(KERN_WARNING, target->scsi_host,
1509 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1510 ret = -ECONNRESET;
1511 goto error;
1512 }
1513
1514 if (!target->rx_ring[0]) {
1515 ret = srp_alloc_iu_bufs(target);
1516 if (ret)
1517 goto error;
1518 }
1519
1520 ret = -ENOMEM;
1521 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1522 if (!qp_attr)
1523 goto error;
1524
1525 qp_attr->qp_state = IB_QPS_RTR;
1526 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1527 if (ret)
1528 goto error_free;
1529
1530 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1531 if (ret)
1532 goto error_free;
1533
1534 for (i = 0; i < SRP_RQ_SIZE; i++) {
1535 struct srp_iu *iu = target->rx_ring[i];
1536 ret = srp_post_recv(target, iu);
1537 if (ret)
1538 goto error_free;
1539 }
1540
1541 qp_attr->qp_state = IB_QPS_RTS;
1542 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1543 if (ret)
1544 goto error_free;
1545
c9b03c1a
BVA		 1546 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1547
961e0be8
DD		 1548 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1549 if (ret)
1550 goto error_free;
1551
1552 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1553
1554error_free:
1555 kfree(qp_attr);
1556
1557error:
1558 target->status = ret;
1559}
1560
aef9ec39
RD		 1561static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1562 struct ib_cm_event *event,
1563 struct srp_target_port *target)
1564{
7aa54bd7 1565 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1566 struct ib_class_port_info *cpi;
1567 int opcode;
1568
1569 switch (event->param.rej_rcvd.reason) {
1570 case IB_CM_REJ_PORT_CM_REDIRECT:
1571 cpi = event->param.rej_rcvd.ari;
1572 target->path.dlid = cpi->redirect_lid;
1573 target->path.pkey = cpi->redirect_pkey;
1574 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1575 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1576
1577 target->status = target->path.dlid ?
1578 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1579 break;
1580
1581 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1582 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1583 /*
1584 * Topspin/Cisco SRP gateways incorrectly send
1585 * reject reason code 25 when they mean 24
1586 * (port redirect).
1587 */
1588 memcpy(target->path.dgid.raw,
1589 event->param.rej_rcvd.ari, 16);
1590
7aa54bd7
DD		 1591 shost_printk(KERN_DEBUG, shost,
1592 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1593 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1594 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1595
1596 target->status = SRP_PORT_REDIRECT;
1597 } else {
7aa54bd7
DD		 1598 shost_printk(KERN_WARNING, shost,
1599 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1600 target->status = -ECONNRESET;
1601 }
1602 break;
1603
1604 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1605 shost_printk(KERN_WARNING, shost,
1606 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1607 target->status = -ECONNRESET;
1608 break;
1609
1610 case IB_CM_REJ_CONSUMER_DEFINED:
1611 opcode = *(u8 *) event->private_data;
1612 if (opcode == SRP_LOGIN_REJ) {
1613 struct srp_login_rej *rej = event->private_data;
1614 u32 reason = be32_to_cpu(rej->reason);
1615
1616 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1617 shost_printk(KERN_WARNING, shost,
1618 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1619 else
7aa54bd7
DD		 1620 shost_printk(KERN_WARNING, shost,
1621 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
aef9ec39 1622 } else
7aa54bd7
DD		 1623 shost_printk(KERN_WARNING, shost,
1624 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1625 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1626 target->status = -ECONNRESET;
1627 break;
1628
9fe4bcf4
DD		 1629 case IB_CM_REJ_STALE_CONN:
1630 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1631 target->status = SRP_STALE_CONN;
1632 break;
1633
aef9ec39 1634 default:
7aa54bd7
DD		 1635 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1636 event->param.rej_rcvd.reason);
aef9ec39
RD		 1637 target->status = -ECONNRESET;
1638 }
1639}
1640
1641static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1642{
1643 struct srp_target_port *target = cm_id->context;
aef9ec39 1644 int comp = 0;
aef9ec39
RD		 1645
1646 switch (event->event) {
1647 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1648 shost_printk(KERN_DEBUG, target->scsi_host,
1649 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1650 comp = 1;
1651 target->status = -ECONNRESET;
1652 break;
1653
1654 case IB_CM_REP_RECEIVED:
1655 comp = 1;
961e0be8 1656 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 1657 break;
1658
1659 case IB_CM_REJ_RECEIVED:
7aa54bd7 1660 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1661 comp = 1;
1662
1663 srp_cm_rej_handler(cm_id, event, target);
1664 break;
1665
b7ac4ab4 1666 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1667 shost_printk(KERN_WARNING, target->scsi_host,
1668 PFX "DREQ received - connection closed\n");
294c875a 1669 srp_change_conn_state(target, false);
b7ac4ab4 1670 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1671 shost_printk(KERN_ERR, target->scsi_host,
1672 PFX "Sending CM DREP failed\n");
aef9ec39
RD		 1673 break;
1674
1675 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1676 shost_printk(KERN_ERR, target->scsi_host,
1677 PFX "connection closed\n");
aef9ec39 1678
aef9ec39
RD		 1679 target->status = 0;
1680 break;
1681
b7ac4ab4
IR		 1682 case IB_CM_MRA_RECEIVED:
1683 case IB_CM_DREQ_ERROR:
1684 case IB_CM_DREP_RECEIVED:
1685 break;
1686
aef9ec39 1687 default:
7aa54bd7
DD		 1688 shost_printk(KERN_WARNING, target->scsi_host,
1689 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1690 break;
1691 }
1692
1693 if (comp)
1694 complete(&target->done);
1695
aef9ec39
RD		 1696 return 0;
1697}
1698
d945e1df 1699static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 1700 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 1701{
19081f31 1702 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 1703 struct srp_iu *iu;
1704 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 1705
3780d1f0
BVA		 1706 if (!target->connected || target->qp_in_error)
1707 return -1;
1708
f8b6e31e 1709 init_completion(&target->tsk_mgmt_done);
aef9ec39 1710
e9684678 1711 spin_lock_irq(&target->lock);
bb12588a 1712 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 1713 spin_unlock_irq(&target->lock);
76c75b25 1714
aef9ec39 1715 if (!iu)
76c75b25 1716 return -1;
aef9ec39 1717
19081f31
DD		 1718 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1719 DMA_TO_DEVICE);
aef9ec39
RD		 1720 tsk_mgmt = iu->buf;
1721 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1722
1723 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 1724 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1725 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 1726 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 1727 tsk_mgmt->task_tag = req_tag;
aef9ec39 1728
19081f31
DD		 1729 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1730 DMA_TO_DEVICE);
76c75b25
BVA		 1731 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
1732 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
1733 return -1;
1734 }
d945e1df 1735
f8b6e31e 1736 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 1737 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1738 return -1;
aef9ec39 1739
d945e1df 1740 return 0;
d945e1df
RD		 1741}
1742
aef9ec39
RD		 1743static int srp_abort(struct scsi_cmnd *scmnd)
1744{
d945e1df 1745 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 1746 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
d945e1df 1747
7aa54bd7 1748 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 1749
c7c4e7ff 1750 if (!req || !srp_claim_req(target, req, scmnd))
d945e1df 1751 return FAILED;
22032991
BVA		 1752 srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
1753 SRP_TSK_ABORT_TASK);
1754 srp_free_req(target, req, scmnd, 0);
1755 scmnd->result = DID_ABORT << 16;
d8536670 1756 scmnd->scsi_done(scmnd);
d945e1df 1757
22032991 1758 return SUCCESS;
aef9ec39
RD		 1759}
1760
1761static int srp_reset_device(struct scsi_cmnd *scmnd)
1762{
d945e1df 1763 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 1764 int i;
d945e1df 1765
7aa54bd7 1766 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 1767
f8b6e31e
DD		 1768 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
1769 SRP_TSK_LUN_RESET))
d945e1df 1770 return FAILED;
f8b6e31e 1771 if (target->tsk_mgmt_status)
d945e1df
RD		 1772 return FAILED;
1773
536ae14e
BVA		 1774 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1775 struct srp_request *req = &target->req_ring[i];
f8b6e31e 1776 if (req->scmnd && req->scmnd->device == scmnd->device)
526b4caa 1777 srp_reset_req(target, req);
536ae14e 1778 }
d945e1df 1779
d945e1df 1780 return SUCCESS;
aef9ec39
RD		 1781}
1782
1783static int srp_reset_host(struct scsi_cmnd *scmnd)
1784{
1785 struct srp_target_port *target = host_to_target(scmnd->device->host);
1786 int ret = FAILED;
1787
7aa54bd7 1788 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39
RD		 1789
1790 if (!srp_reconnect_target(target))
1791 ret = SUCCESS;
1792
1793 return ret;
1794}
1795
c9b03c1a
BVA		 1796static int srp_slave_configure(struct scsi_device *sdev)
1797{
1798 struct Scsi_Host *shost = sdev->host;
1799 struct srp_target_port *target = host_to_target(shost);
1800 struct request_queue *q = sdev->request_queue;
1801 unsigned long timeout;
1802
1803 if (sdev->type == TYPE_DISK) {
1804 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
1805 blk_queue_rq_timeout(q, timeout);
1806 }
1807
1808 return 0;
1809}
1810
ee959b00
TJ		 1811static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1812 char *buf)
6ecb0c84 1813{
ee959b00 1814 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1815
6ecb0c84
RD		 1816 return sprintf(buf, "0x%016llx\n",
1817 (unsigned long long) be64_to_cpu(target->id_ext));
1818}
1819
ee959b00
TJ		 1820static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1821 char *buf)
6ecb0c84 1822{
ee959b00 1823 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1824
6ecb0c84
RD		 1825 return sprintf(buf, "0x%016llx\n",
1826 (unsigned long long) be64_to_cpu(target->ioc_guid));
1827}
1828
ee959b00
TJ		 1829static ssize_t show_service_id(struct device *dev,
1830 struct device_attribute *attr, char *buf)
6ecb0c84 1831{
ee959b00 1832 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1833
6ecb0c84
RD		 1834 return sprintf(buf, "0x%016llx\n",
1835 (unsigned long long) be64_to_cpu(target->service_id));
1836}
1837
ee959b00
TJ		 1838static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1839 char *buf)
6ecb0c84 1840{
ee959b00 1841 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1842
6ecb0c84
RD		 1843 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1844}
1845
ee959b00
TJ		 1846static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1847 char *buf)
6ecb0c84 1848{
ee959b00 1849 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1850
5b095d98 1851 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 1852}
1853
ee959b00
TJ		 1854static ssize_t show_orig_dgid(struct device *dev,
1855 struct device_attribute *attr, char *buf)
3633b3d0 1856{
ee959b00 1857 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 1858
5b095d98 1859 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 1860}
1861
89de7486
BVA		 1862static ssize_t show_req_lim(struct device *dev,
1863 struct device_attribute *attr, char *buf)
1864{
1865 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1866
89de7486
BVA		 1867 return sprintf(buf, "%d\n", target->req_lim);
1868}
1869
ee959b00
TJ		 1870static ssize_t show_zero_req_lim(struct device *dev,
1871 struct device_attribute *attr, char *buf)
6bfa24fa 1872{
ee959b00 1873 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 1874
6bfa24fa
RD		 1875 return sprintf(buf, "%d\n", target->zero_req_lim);
1876}
1877
ee959b00
TJ		 1878static ssize_t show_local_ib_port(struct device *dev,
1879 struct device_attribute *attr, char *buf)
ded7f1a1 1880{
ee959b00 1881 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 1882
1883 return sprintf(buf, "%d\n", target->srp_host->port);
1884}
1885
ee959b00
TJ		 1886static ssize_t show_local_ib_device(struct device *dev,
1887 struct device_attribute *attr, char *buf)
ded7f1a1 1888{
ee959b00 1889 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 1890
05321937 1891 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 1892}
1893
49248644
DD		 1894static ssize_t show_cmd_sg_entries(struct device *dev,
1895 struct device_attribute *attr, char *buf)
1896{
1897 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1898
1899 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
1900}
1901
c07d424d
DD		 1902static ssize_t show_allow_ext_sg(struct device *dev,
1903 struct device_attribute *attr, char *buf)
1904{
1905 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1906
1907 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
1908}
1909
ee959b00
TJ		 1910static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1911static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1912static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1913static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1914static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1915static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 1916static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 1917static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1918static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1919static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
49248644 1920static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 1921static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 1922
1923static struct device_attribute *srp_host_attrs[] = {
1924 &dev_attr_id_ext,
1925 &dev_attr_ioc_guid,
1926 &dev_attr_service_id,
1927 &dev_attr_pkey,
1928 &dev_attr_dgid,
1929 &dev_attr_orig_dgid,
89de7486 1930 &dev_attr_req_lim,
ee959b00
TJ		 1931 &dev_attr_zero_req_lim,
1932 &dev_attr_local_ib_port,
1933 &dev_attr_local_ib_device,
49248644 1934 &dev_attr_cmd_sg_entries,
c07d424d 1935 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 1936 NULL
1937};
1938
aef9ec39
RD		 1939static struct scsi_host_template srp_template = {
1940 .module = THIS_MODULE,
b7f008fd
RD		 1941 .name = "InfiniBand SRP initiator",
1942 .proc_name = DRV_NAME,
c9b03c1a 1943 .slave_configure = srp_slave_configure,
aef9ec39
RD		 1944 .info = srp_target_info,
1945 .queuecommand = srp_queuecommand,
1946 .eh_abort_handler = srp_abort,
1947 .eh_device_reset_handler = srp_reset_device,
1948 .eh_host_reset_handler = srp_reset_host,
49248644 1949 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
dd5e6e38 1950 .can_queue = SRP_CMD_SQ_SIZE,
aef9ec39 1951 .this_id = -1,
dd5e6e38 1952 .cmd_per_lun = SRP_CMD_SQ_SIZE,
6ecb0c84
RD		 1953 .use_clustering = ENABLE_CLUSTERING,
1954 .shost_attrs = srp_host_attrs
aef9ec39
RD		 1955};
1956
1957static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1958{
3236822b
FT		 1959 struct srp_rport_identifiers ids;
1960 struct srp_rport *rport;
1961
aef9ec39
RD		 1962 sprintf(target->target_name, "SRP.T10:%016llX",
1963 (unsigned long long) be64_to_cpu(target->id_ext));
1964
05321937 1965 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 1966 return -ENODEV;
1967
3236822b
FT		 1968 memcpy(ids.port_id, &target->id_ext, 8);
1969 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 1970 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 1971 rport = srp_rport_add(target->scsi_host, &ids);
1972 if (IS_ERR(rport)) {
1973 scsi_remove_host(target->scsi_host);
1974 return PTR_ERR(rport);
1975 }
1976
dc1bdbd9
BVA		 1977 rport->lld_data = target;
1978
b3589fd4 1979 spin_lock(&host->target_lock);
aef9ec39 1980 list_add_tail(&target->list, &host->target_list);
b3589fd4 1981 spin_unlock(&host->target_lock);
aef9ec39
RD		 1982
1983 target->state = SRP_TARGET_LIVE;
1984
aef9ec39 1985 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 1986 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 1987
1988 return 0;
1989}
1990
ee959b00 1991static void srp_release_dev(struct device *dev)
aef9ec39
RD		 1992{
1993 struct srp_host *host =
ee959b00 1994 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1995
1996 complete(&host->released);
1997}
1998
1999static struct class srp_class = {
2000 .name = "infiniband_srp",
ee959b00 2001 .dev_release = srp_release_dev
aef9ec39
RD		 2002};
2003
2004/*
2005 * Target ports are added by writing
2006 *
2007 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2008 * pkey=<P_Key>,service_id=<service ID>
2009 *
2010 * to the add_target sysfs attribute.
2011 */
2012enum {
2013 SRP_OPT_ERR = 0,
2014 SRP_OPT_ID_EXT = 1 << 0,
2015 SRP_OPT_IOC_GUID = 1 << 1,
2016 SRP_OPT_DGID = 1 << 2,
2017 SRP_OPT_PKEY = 1 << 3,
2018 SRP_OPT_SERVICE_ID = 1 << 4,
2019 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2020 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2021 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2022 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2023 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2024 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2025 SRP_OPT_SG_TABLESIZE = 1 << 11,
aef9ec39
RD		 2026 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2027 SRP_OPT_IOC_GUID |
2028 SRP_OPT_DGID |
2029 SRP_OPT_PKEY |
2030 SRP_OPT_SERVICE_ID),
2031};
2032
a447c093 2033static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2034 { SRP_OPT_ID_EXT, "id_ext=%s" },
2035 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2036 { SRP_OPT_DGID, "dgid=%s" },
2037 { SRP_OPT_PKEY, "pkey=%x" },
2038 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2039 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2040 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2041 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2042 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2043 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2044 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2045 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
52fb2b50 2046 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2047};
2048
2049static int srp_parse_options(const char *buf, struct srp_target_port *target)
2050{
2051 char *options, *sep_opt;
2052 char *p;
2053 char dgid[3];
2054 substring_t args[MAX_OPT_ARGS];
2055 int opt_mask = 0;
2056 int token;
2057 int ret = -EINVAL;
2058 int i;
2059
2060 options = kstrdup(buf, GFP_KERNEL);
2061 if (!options)
2062 return -ENOMEM;
2063
2064 sep_opt = options;
2065 while ((p = strsep(&sep_opt, ",")) != NULL) {
2066 if (!*p)
2067 continue;
2068
2069 token = match_token(p, srp_opt_tokens, args);
2070 opt_mask |= token;
2071
2072 switch (token) {
2073 case SRP_OPT_ID_EXT:
2074 p = match_strdup(args);
a20f3a6d
IR		 2075 if (!p) {
2076 ret = -ENOMEM;
2077 goto out;
2078 }
aef9ec39
RD		 2079 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2080 kfree(p);
2081 break;
2082
2083 case SRP_OPT_IOC_GUID:
2084 p = match_strdup(args);
a20f3a6d
IR		 2085 if (!p) {
2086 ret = -ENOMEM;
2087 goto out;
2088 }
aef9ec39
RD		 2089 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2090 kfree(p);
2091 break;
2092
2093 case SRP_OPT_DGID:
2094 p = match_strdup(args);
a20f3a6d
IR		 2095 if (!p) {
2096 ret = -ENOMEM;
2097 goto out;
2098 }
aef9ec39 2099 if (strlen(p) != 32) {
e0bda7d8 2100 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2101 kfree(p);
aef9ec39
RD		 2102 goto out;
2103 }
2104
2105 for (i = 0; i < 16; ++i) {
2106 strlcpy(dgid, p + i * 2, 3);
2107 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2108 }
bf17c1c7 2109 kfree(p);
3633b3d0 2110 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2111 break;
2112
2113 case SRP_OPT_PKEY:
2114 if (match_hex(args, &token)) {
e0bda7d8 2115 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2116 goto out;
2117 }
2118 target->path.pkey = cpu_to_be16(token);
2119 break;
2120
2121 case SRP_OPT_SERVICE_ID:
2122 p = match_strdup(args);
a20f3a6d
IR		 2123 if (!p) {
2124 ret = -ENOMEM;
2125 goto out;
2126 }
aef9ec39 2127 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2128 target->path.service_id = target->service_id;
aef9ec39
RD		 2129 kfree(p);
2130 break;
2131
2132 case SRP_OPT_MAX_SECT:
2133 if (match_int(args, &token)) {
e0bda7d8 2134 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2135 goto out;
2136 }
2137 target->scsi_host->max_sectors = token;
2138 break;
2139
52fb2b50
VP		 2140 case SRP_OPT_MAX_CMD_PER_LUN:
2141 if (match_int(args, &token)) {
e0bda7d8
BVA		 2142 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2143 p);
52fb2b50
VP		 2144 goto out;
2145 }
dd5e6e38 2146 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
52fb2b50
VP		 2147 break;
2148
0c0450db
R		 2149 case SRP_OPT_IO_CLASS:
2150 if (match_hex(args, &token)) {
e0bda7d8 2151 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2152 goto out;
2153 }
2154 if (token != SRP_REV10_IB_IO_CLASS &&
2155 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2156 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2157 token, SRP_REV10_IB_IO_CLASS,
2158 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2159 goto out;
2160 }
2161 target->io_class = token;
2162 break;
2163
01cb9bcb
IR		 2164 case SRP_OPT_INITIATOR_EXT:
2165 p = match_strdup(args);
a20f3a6d
IR		 2166 if (!p) {
2167 ret = -ENOMEM;
2168 goto out;
2169 }
01cb9bcb
IR		 2170 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2171 kfree(p);
2172 break;
2173
49248644
DD		 2174 case SRP_OPT_CMD_SG_ENTRIES:
2175 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2176 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2177 p);
49248644
DD		 2178 goto out;
2179 }
2180 target->cmd_sg_cnt = token;
2181 break;
2182
c07d424d
DD		 2183 case SRP_OPT_ALLOW_EXT_SG:
2184 if (match_int(args, &token)) {
e0bda7d8 2185 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2186 goto out;
2187 }
2188 target->allow_ext_sg = !!token;
2189 break;
2190
2191 case SRP_OPT_SG_TABLESIZE:
2192 if (match_int(args, &token) || token < 1 ||
2193 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2194 pr_warn("bad max sg_tablesize parameter '%s'\n",
2195 p);
c07d424d
DD		 2196 goto out;
2197 }
2198 target->sg_tablesize = token;
2199 break;
2200
aef9ec39 2201 default:
e0bda7d8
BVA		 2202 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2203 p);
aef9ec39
RD		 2204 goto out;
2205 }
2206 }
2207
2208 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2209 ret = 0;
2210 else
2211 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2212 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2213 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2214 pr_warn("target creation request is missing parameter '%s'\n",
2215 srp_opt_tokens[i].pattern);
aef9ec39
RD		 2216
2217out:
2218 kfree(options);
2219 return ret;
2220}
2221
ee959b00
TJ		 2222static ssize_t srp_create_target(struct device *dev,
2223 struct device_attribute *attr,
aef9ec39
RD		 2224 const char *buf, size_t count)
2225{
2226 struct srp_host *host =
ee959b00 2227 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2228 struct Scsi_Host *target_host;
2229 struct srp_target_port *target;
c07d424d
DD		 2230 struct ib_device *ibdev = host->srp_dev->dev;
2231 dma_addr_t dma_addr;
8f26c9ff 2232 int i, ret;
aef9ec39
RD		 2233
2234 target_host = scsi_host_alloc(&srp_template,
2235 sizeof (struct srp_target_port));
2236 if (!target_host)
2237 return -ENOMEM;
2238
49248644 2239 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2240 target_host->max_channel = 0;
2241 target_host->max_id = 1;
3c8edf0e
AR		 2242 target_host->max_lun = SRP_MAX_LUN;
2243 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2244
aef9ec39 2245 target = host_to_target(target_host);
aef9ec39 2246
49248644
DD		 2247 target->io_class = SRP_REV16A_IB_IO_CLASS;
2248 target->scsi_host = target_host;
2249 target->srp_host = host;
2250 target->lkey = host->srp_dev->mr->lkey;
2251 target->rkey = host->srp_dev->mr->rkey;
2252 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2253 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2254 target->allow_ext_sg = allow_ext_sg;
aef9ec39 2255
aef9ec39
RD		 2256 ret = srp_parse_options(buf, target);
2257 if (ret)
2258 goto err;
2259
c07d424d
DD		 2260 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2261 target->cmd_sg_cnt < target->sg_tablesize) {
e0bda7d8 2262 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 2263 target->sg_tablesize = target->cmd_sg_cnt;
2264 }
2265
2266 target_host->sg_tablesize = target->sg_tablesize;
2267 target->indirect_size = target->sg_tablesize *
2268 sizeof (struct srp_direct_buf);
49248644
DD		 2269 target->max_iu_len = sizeof (struct srp_cmd) +
2270 sizeof (struct srp_indirect_buf) +
2271 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2272
ef6c49d8 2273 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 2274 spin_lock_init(&target->lock);
2275 INIT_LIST_HEAD(&target->free_tx);
2276 INIT_LIST_HEAD(&target->free_reqs);
2277 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
2278 struct srp_request *req = &target->req_ring[i];
2279
2280 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *),
2281 GFP_KERNEL);
2282 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *),
2283 GFP_KERNEL);
c07d424d
DD		 2284 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
2285 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
8f26c9ff
DD		 2286 goto err_free_mem;
2287
c07d424d
DD		 2288 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
2289 target->indirect_size,
2290 DMA_TO_DEVICE);
2291 if (ib_dma_mapping_error(ibdev, dma_addr))
2292 goto err_free_mem;
2293
2294 req->indirect_dma_addr = dma_addr;
8f26c9ff
DD		 2295 req->index = i;
2296 list_add_tail(&req->list, &target->free_reqs);
2297 }
2298
c07d424d 2299 ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
aef9ec39 2300
7aa54bd7
DD		 2301 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2302 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
5b095d98 2303 "service_id %016llx dgid %pI6\n",
aef9ec39
RD		 2304 (unsigned long long) be64_to_cpu(target->id_ext),
2305 (unsigned long long) be64_to_cpu(target->ioc_guid),
2306 be16_to_cpu(target->path.pkey),
2307 (unsigned long long) be64_to_cpu(target->service_id),
8867cd7c 2308 target->path.dgid.raw);
aef9ec39
RD		 2309
2310 ret = srp_create_target_ib(target);
2311 if (ret)
8f26c9ff 2312 goto err_free_mem;
aef9ec39 2313
9fe4bcf4
DD		 2314 ret = srp_new_cm_id(target);
2315 if (ret)
8f26c9ff 2316 goto err_free_ib;
aef9ec39
RD		 2317
2318 ret = srp_connect_target(target);
2319 if (ret) {
7aa54bd7
DD		 2320 shost_printk(KERN_ERR, target->scsi_host,
2321 PFX "Connection failed\n");
aef9ec39
RD		 2322 goto err_cm_id;
2323 }
2324
2325 ret = srp_add_target(host, target);
2326 if (ret)
2327 goto err_disconnect;
2328
2329 return count;
2330
2331err_disconnect:
2332 srp_disconnect_target(target);
2333
2334err_cm_id:
2335 ib_destroy_cm_id(target->cm_id);
2336
8f26c9ff 2337err_free_ib:
aef9ec39
RD		 2338 srp_free_target_ib(target);
2339
8f26c9ff
DD		 2340err_free_mem:
2341 srp_free_req_data(target);
2342
aef9ec39
RD		 2343err:
2344 scsi_host_put(target_host);
2345
2346 return ret;
2347}
2348
ee959b00 2349static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2350
ee959b00
TJ		 2351static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2352 char *buf)
aef9ec39 2353{
ee959b00 2354 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2355
05321937 2356 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2357}
2358
ee959b00 2359static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2360
ee959b00
TJ		 2361static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2362 char *buf)
aef9ec39 2363{
ee959b00 2364 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2365
2366 return sprintf(buf, "%d\n", host->port);
2367}
2368
ee959b00 2369static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2370
f5358a17 2371static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2372{
2373 struct srp_host *host;
2374
2375 host = kzalloc(sizeof *host, GFP_KERNEL);
2376 if (!host)
2377 return NULL;
2378
2379 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2380 spin_lock_init(&host->target_lock);
aef9ec39 2381 init_completion(&host->released);
05321937 2382 host->srp_dev = device;
aef9ec39
RD		 2383 host->port = port;
2384
ee959b00
TJ		 2385 host->dev.class = &srp_class;
2386 host->dev.parent = device->dev->dma_device;
d927e38c 2387 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2388
ee959b00 2389 if (device_register(&host->dev))
f5358a17 2390 goto free_host;
ee959b00 2391 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2392 goto err_class;
ee959b00 2393 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2394 goto err_class;
ee959b00 2395 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2396 goto err_class;
2397
2398 return host;
2399
2400err_class:
ee959b00 2401 device_unregister(&host->dev);
aef9ec39 2402
f5358a17 2403free_host:
aef9ec39
RD		 2404 kfree(host);
2405
2406 return NULL;
2407}
2408
2409static void srp_add_one(struct ib_device *device)
2410{
f5358a17
RD		 2411 struct srp_device *srp_dev;
2412 struct ib_device_attr *dev_attr;
2413 struct ib_fmr_pool_param fmr_param;
aef9ec39 2414 struct srp_host *host;
be8b9814 2415 int max_pages_per_fmr, fmr_page_shift, s, e, p;
aef9ec39 2416
f5358a17
RD		 2417 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2418 if (!dev_attr)
cf311cd4 2419 return;
aef9ec39 2420
f5358a17 2421 if (ib_query_device(device, dev_attr)) {
e0bda7d8 2422 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 2423 goto free_attr;
2424 }
2425
2426 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2427 if (!srp_dev)
2428 goto free_attr;
2429
2430 /*
2431 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 2432 * minimum of 4096 bytes. We're unlikely to build large sglists
2433 * out of smaller entries.
f5358a17 2434 */
8f26c9ff
DD		 2435 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2436 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2437 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2438 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
f5358a17
RD		 2439
2440 INIT_LIST_HEAD(&srp_dev->dev_list);
2441
2442 srp_dev->dev = device;
2443 srp_dev->pd = ib_alloc_pd(device);
2444 if (IS_ERR(srp_dev->pd))
2445 goto free_dev;
2446
2447 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2448 IB_ACCESS_LOCAL_WRITE |
2449 IB_ACCESS_REMOTE_READ |
2450 IB_ACCESS_REMOTE_WRITE);
2451 if (IS_ERR(srp_dev->mr))
2452 goto err_pd;
2453
be8b9814
DD		 2454 for (max_pages_per_fmr = SRP_FMR_SIZE;
2455 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2456 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2457 memset(&fmr_param, 0, sizeof fmr_param);
2458 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2459 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2460 fmr_param.cache = 1;
2461 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2462 fmr_param.page_shift = fmr_page_shift;
2463 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2464 IB_ACCESS_REMOTE_WRITE |
2465 IB_ACCESS_REMOTE_READ);
2466
2467 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2468 if (!IS_ERR(srp_dev->fmr_pool))
2469 break;
2470 }
2471
f5358a17
RD		 2472 if (IS_ERR(srp_dev->fmr_pool))
2473 srp_dev->fmr_pool = NULL;
aef9ec39 2474
07ebafba 2475 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2476 s = 0;
2477 e = 0;
2478 } else {
2479 s = 1;
2480 e = device->phys_port_cnt;
2481 }
2482
2483 for (p = s; p <= e; ++p) {
f5358a17 2484 host = srp_add_port(srp_dev, p);
aef9ec39 2485 if (host)
f5358a17 2486 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2487 }
2488
f5358a17
RD		 2489 ib_set_client_data(device, &srp_client, srp_dev);
2490
2491 goto free_attr;
2492
2493err_pd:
2494 ib_dealloc_pd(srp_dev->pd);
2495
2496free_dev:
2497 kfree(srp_dev);
2498
2499free_attr:
2500 kfree(dev_attr);
aef9ec39
RD		 2501}
2502
2503static void srp_remove_one(struct ib_device *device)
2504{
f5358a17 2505 struct srp_device *srp_dev;
aef9ec39 2506 struct srp_host *host, *tmp_host;
ef6c49d8 2507 struct srp_target_port *target;
aef9ec39 2508
f5358a17 2509 srp_dev = ib_get_client_data(device, &srp_client);
1fe0cb84
DB		 2510 if (!srp_dev)
2511 return;
aef9ec39 2512
f5358a17 2513 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2514 device_unregister(&host->dev);
aef9ec39
RD		 2515 /*
2516 * Wait for the sysfs entry to go away, so that no new
2517 * target ports can be created.
2518 */
2519 wait_for_completion(&host->released);
2520
2521 /*
ef6c49d8 2522 * Remove all target ports.
aef9ec39 2523 */
b3589fd4 2524 spin_lock(&host->target_lock);
ef6c49d8
BVA		 2525 list_for_each_entry(target, &host->target_list, list)
2526 srp_queue_remove_work(target);
b3589fd4 2527 spin_unlock(&host->target_lock);
aef9ec39
RD		 2528
2529 /*
ef6c49d8 2530 * Wait for target port removal tasks.
aef9ec39 2531 */
ef6c49d8 2532 flush_workqueue(system_long_wq);
aef9ec39 2533
aef9ec39
RD		 2534 kfree(host);
2535 }
2536
f5358a17
RD		 2537 if (srp_dev->fmr_pool)
2538 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2539 ib_dereg_mr(srp_dev->mr);
2540 ib_dealloc_pd(srp_dev->pd);
2541
2542 kfree(srp_dev);
aef9ec39
RD		 2543}
2544
3236822b 2545static struct srp_function_template ib_srp_transport_functions = {
dc1bdbd9 2546 .rport_delete = srp_rport_delete,
3236822b
FT		 2547};
2548
aef9ec39
RD		 2549static int __init srp_init_module(void)
2550{
2551 int ret;
2552
dcb4cb85 2553 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 2554
49248644 2555 if (srp_sg_tablesize) {
e0bda7d8 2556 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 2557 if (!cmd_sg_entries)
2558 cmd_sg_entries = srp_sg_tablesize;
2559 }
2560
2561 if (!cmd_sg_entries)
2562 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2563
2564 if (cmd_sg_entries > 255) {
e0bda7d8 2565 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 2566 cmd_sg_entries = 255;
1e89a194
DD		 2567 }
2568
c07d424d
DD		 2569 if (!indirect_sg_entries)
2570 indirect_sg_entries = cmd_sg_entries;
2571 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 2572 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2573 cmd_sg_entries);
c07d424d
DD		 2574 indirect_sg_entries = cmd_sg_entries;
2575 }
2576
3236822b
FT		 2577 ib_srp_transport_template =
2578 srp_attach_transport(&ib_srp_transport_functions);
2579 if (!ib_srp_transport_template)
2580 return -ENOMEM;
2581
aef9ec39
RD		 2582 ret = class_register(&srp_class);
2583 if (ret) {
e0bda7d8 2584 pr_err("couldn't register class infiniband_srp\n");
3236822b 2585 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2586 return ret;
2587 }
2588
c1a0b23b
MT		 2589 ib_sa_register_client(&srp_sa_client);
2590
aef9ec39
RD		 2591 ret = ib_register_client(&srp_client);
2592 if (ret) {
e0bda7d8 2593 pr_err("couldn't register IB client\n");
3236822b 2594 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2595 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2596 class_unregister(&srp_class);
2597 return ret;
2598 }
2599
2600 return 0;
2601}
2602
2603static void __exit srp_cleanup_module(void)
2604{
2605 ib_unregister_client(&srp_client);
c1a0b23b 2606 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 2607 class_unregister(&srp_class);
3236822b 2608 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2609}
2610
2611module_init(srp_init_module);
2612module_exit(srp_cleanup_module);
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