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firmware: Correct dependency on CONFIG_EXTRA_FIRMWARE_DIR
[deliverable/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.
31 *
32 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
33 */
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
RD		 43
44#include <asm/atomic.h>
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
RD		 51
52#include <rdma/ib_cache.h>
53
54#include "ib_srp.h"
55
56#define DRV_NAME "ib_srp"
57#define PFX DRV_NAME ": "
58#define DRV_VERSION "0.2"
59#define DRV_RELDATE "November 1, 2005"
60
61MODULE_AUTHOR("Roland Dreier");
62MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
63 "v" DRV_VERSION " (" DRV_RELDATE ")");
64MODULE_LICENSE("Dual BSD/GPL");
65
74b0a15b
VP		 66static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
67static int srp_max_iu_len;
68
69module_param(srp_sg_tablesize, int, 0444);
70MODULE_PARM_DESC(srp_sg_tablesize,
1e89a194 71 "Max number of gather/scatter entries per I/O (default is 12, max 255)");
74b0a15b 72
aef9ec39
RD		 73static int topspin_workarounds = 1;
74
75module_param(topspin_workarounds, int, 0444);
76MODULE_PARM_DESC(topspin_workarounds,
77 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
78
559ce8f1
IR		 79static int mellanox_workarounds = 1;
80
81module_param(mellanox_workarounds, int, 0444);
82MODULE_PARM_DESC(mellanox_workarounds,
83 "Enable workarounds for Mellanox SRP target bugs if != 0");
84
aef9ec39
RD		 85static void srp_add_one(struct ib_device *device);
86static void srp_remove_one(struct ib_device *device);
87static void srp_completion(struct ib_cq *cq, void *target_ptr);
88static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
89
3236822b
FT		 90static struct scsi_transport_template *ib_srp_transport_template;
91
aef9ec39
RD		 92static struct ib_client srp_client = {
93 .name = "srp",
94 .add = srp_add_one,
95 .remove = srp_remove_one
96};
97
c1a0b23b
MT		 98static struct ib_sa_client srp_sa_client;
99
aef9ec39
RD		 100static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
101{
102 return (struct srp_target_port *) host->hostdata;
103}
104
105static const char *srp_target_info(struct Scsi_Host *host)
106{
107 return host_to_target(host)->target_name;
108}
109
5d7cbfd6
RD		 110static int srp_target_is_topspin(struct srp_target_port *target)
111{
112 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 113 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 114
115 return topspin_workarounds &&
3d1ff48d
RK		 116 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
117 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 118}
119
120static int srp_target_is_mellanox(struct srp_target_port *target)
121{
122 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
123
124 return mellanox_workarounds &&
125 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
126}
127
aef9ec39
RD		 128static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
129 gfp_t gfp_mask,
130 enum dma_data_direction direction)
131{
132 struct srp_iu *iu;
133
134 iu = kmalloc(sizeof *iu, gfp_mask);
135 if (!iu)
136 goto out;
137
138 iu->buf = kzalloc(size, gfp_mask);
139 if (!iu->buf)
140 goto out_free_iu;
141
05321937
GKH		 142 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
143 direction);
144 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 145 goto out_free_buf;
146
147 iu->size = size;
148 iu->direction = direction;
149
150 return iu;
151
152out_free_buf:
153 kfree(iu->buf);
154out_free_iu:
155 kfree(iu);
156out:
157 return NULL;
158}
159
160static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
161{
162 if (!iu)
163 return;
164
05321937
GKH		 165 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
166 iu->direction);
aef9ec39
RD		 167 kfree(iu->buf);
168 kfree(iu);
169}
170
171static void srp_qp_event(struct ib_event *event, void *context)
172{
173 printk(KERN_ERR PFX "QP event %d\n", event->event);
174}
175
176static int srp_init_qp(struct srp_target_port *target,
177 struct ib_qp *qp)
178{
179 struct ib_qp_attr *attr;
180 int ret;
181
182 attr = kmalloc(sizeof *attr, GFP_KERNEL);
183 if (!attr)
184 return -ENOMEM;
185
05321937 186 ret = ib_find_cached_pkey(target->srp_host->srp_dev->dev,
aef9ec39
RD		 187 target->srp_host->port,
188 be16_to_cpu(target->path.pkey),
189 &attr->pkey_index);
190 if (ret)
191 goto out;
192
193 attr->qp_state = IB_QPS_INIT;
194 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
195 IB_ACCESS_REMOTE_WRITE);
196 attr->port_num = target->srp_host->port;
197
198 ret = ib_modify_qp(qp, attr,
199 IB_QP_STATE |
200 IB_QP_PKEY_INDEX |
201 IB_QP_ACCESS_FLAGS |
202 IB_QP_PORT);
203
204out:
205 kfree(attr);
206 return ret;
207}
208
9fe4bcf4
DD		 209static int srp_new_cm_id(struct srp_target_port *target)
210{
211 struct ib_cm_id *new_cm_id;
212
05321937 213 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 214 srp_cm_handler, target);
215 if (IS_ERR(new_cm_id))
216 return PTR_ERR(new_cm_id);
217
218 if (target->cm_id)
219 ib_destroy_cm_id(target->cm_id);
220 target->cm_id = new_cm_id;
221
222 return 0;
223}
224
aef9ec39
RD		 225static int srp_create_target_ib(struct srp_target_port *target)
226{
227 struct ib_qp_init_attr *init_attr;
228 int ret;
229
230 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
231 if (!init_attr)
232 return -ENOMEM;
233
05321937
GKH		 234 target->cq = ib_create_cq(target->srp_host->srp_dev->dev,
235 srp_completion, NULL, target, SRP_CQ_SIZE, 0);
aef9ec39
RD		 236 if (IS_ERR(target->cq)) {
237 ret = PTR_ERR(target->cq);
238 goto out;
239 }
240
241 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
242
243 init_attr->event_handler = srp_qp_event;
244 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
245 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
246 init_attr->cap.max_recv_sge = 1;
247 init_attr->cap.max_send_sge = 1;
248 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
249 init_attr->qp_type = IB_QPT_RC;
250 init_attr->send_cq = target->cq;
251 init_attr->recv_cq = target->cq;
252
05321937 253 target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
aef9ec39
RD		 254 if (IS_ERR(target->qp)) {
255 ret = PTR_ERR(target->qp);
256 ib_destroy_cq(target->cq);
257 goto out;
258 }
259
260 ret = srp_init_qp(target, target->qp);
261 if (ret) {
262 ib_destroy_qp(target->qp);
263 ib_destroy_cq(target->cq);
264 goto out;
265 }
266
267out:
268 kfree(init_attr);
269 return ret;
270}
271
272static void srp_free_target_ib(struct srp_target_port *target)
273{
274 int i;
275
276 ib_destroy_qp(target->qp);
277 ib_destroy_cq(target->cq);
278
279 for (i = 0; i < SRP_RQ_SIZE; ++i)
280 srp_free_iu(target->srp_host, target->rx_ring[i]);
281 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
282 srp_free_iu(target->srp_host, target->tx_ring[i]);
283}
284
285static void srp_path_rec_completion(int status,
286 struct ib_sa_path_rec *pathrec,
287 void *target_ptr)
288{
289 struct srp_target_port *target = target_ptr;
290
291 target->status = status;
292 if (status)
7aa54bd7
DD		 293 shost_printk(KERN_ERR, target->scsi_host,
294 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 295 else
296 target->path = *pathrec;
297 complete(&target->done);
298}
299
300static int srp_lookup_path(struct srp_target_port *target)
301{
302 target->path.numb_path = 1;
303
304 init_completion(&target->done);
305
c1a0b23b 306 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 307 target->srp_host->srp_dev->dev,
aef9ec39
RD		 308 target->srp_host->port,
309 &target->path,
247e020e 310 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 311 IB_SA_PATH_REC_DGID |
312 IB_SA_PATH_REC_SGID |
313 IB_SA_PATH_REC_NUMB_PATH |
314 IB_SA_PATH_REC_PKEY,
315 SRP_PATH_REC_TIMEOUT_MS,
316 GFP_KERNEL,
317 srp_path_rec_completion,
318 target, &target->path_query);
319 if (target->path_query_id < 0)
320 return target->path_query_id;
321
322 wait_for_completion(&target->done);
323
324 if (target->status < 0)
7aa54bd7
DD		 325 shost_printk(KERN_WARNING, target->scsi_host,
326 PFX "Path record query failed\n");
aef9ec39
RD		 327
328 return target->status;
329}
330
331static int srp_send_req(struct srp_target_port *target)
332{
333 struct {
334 struct ib_cm_req_param param;
335 struct srp_login_req priv;
336 } *req = NULL;
337 int status;
338
339 req = kzalloc(sizeof *req, GFP_KERNEL);
340 if (!req)
341 return -ENOMEM;
342
343 req->param.primary_path = &target->path;
344 req->param.alternate_path = NULL;
345 req->param.service_id = target->service_id;
346 req->param.qp_num = target->qp->qp_num;
347 req->param.qp_type = target->qp->qp_type;
348 req->param.private_data = &req->priv;
349 req->param.private_data_len = sizeof req->priv;
350 req->param.flow_control = 1;
351
352 get_random_bytes(&req->param.starting_psn, 4);
353 req->param.starting_psn &= 0xffffff;
354
355 /*
356 * Pick some arbitrary defaults here; we could make these
357 * module parameters if anyone cared about setting them.
358 */
359 req->param.responder_resources = 4;
360 req->param.remote_cm_response_timeout = 20;
361 req->param.local_cm_response_timeout = 20;
362 req->param.retry_count = 7;
363 req->param.rnr_retry_count = 7;
364 req->param.max_cm_retries = 15;
365
366 req->priv.opcode = SRP_LOGIN_REQ;
367 req->priv.tag = 0;
74b0a15b 368 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
aef9ec39
RD		 369 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
370 SRP_BUF_FORMAT_INDIRECT);
0c0450db 371 /*
3cd96564 372 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 373 * port identifier format is 8 bytes of ID extension followed
374 * by 8 bytes of GUID. Older drafts put the two halves in the
375 * opposite order, so that the GUID comes first.
376 *
377 * Targets conforming to these obsolete drafts can be
378 * recognized by the I/O Class they report.
379 */
380 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
381 memcpy(req->priv.initiator_port_id,
01cb9bcb 382 &target->path.sgid.global.interface_id, 8);
0c0450db 383 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 384 &target->initiator_ext, 8);
0c0450db
R		 385 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
386 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
387 } else {
388 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 389 &target->initiator_ext, 8);
390 memcpy(req->priv.initiator_port_id + 8,
391 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 392 memcpy(req->priv.target_port_id, &target->id_ext, 8);
393 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
394 }
395
aef9ec39
RD		 396 /*
397 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 398 * zero out the first 8 bytes of our initiator port ID and set
399 * the second 8 bytes to the local node GUID.
aef9ec39 400 */
5d7cbfd6 401 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 402 shost_printk(KERN_DEBUG, target->scsi_host,
403 PFX "Topspin/Cisco initiator port ID workaround "
404 "activated for target GUID %016llx\n",
405 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 406 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 407 memcpy(req->priv.initiator_port_id + 8,
05321937 408 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 409 }
aef9ec39
RD		 410
411 status = ib_send_cm_req(target->cm_id, &req->param);
412
413 kfree(req);
414
415 return status;
416}
417
418static void srp_disconnect_target(struct srp_target_port *target)
419{
420 /* XXX should send SRP_I_LOGOUT request */
421
422 init_completion(&target->done);
e6581056 423 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
7aa54bd7
DD		 424 shost_printk(KERN_DEBUG, target->scsi_host,
425 PFX "Sending CM DREQ failed\n");
e6581056
RD		 426 return;
427 }
aef9ec39
RD		 428 wait_for_completion(&target->done);
429}
430
c4028958 431static void srp_remove_work(struct work_struct *work)
aef9ec39 432{
c4028958
DH		 433 struct srp_target_port *target =
434 container_of(work, struct srp_target_port, work);
aef9ec39
RD		 435
436 spin_lock_irq(target->scsi_host->host_lock);
437 if (target->state != SRP_TARGET_DEAD) {
438 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 439 return;
440 }
441 target->state = SRP_TARGET_REMOVED;
442 spin_unlock_irq(target->scsi_host->host_lock);
443
b3589fd4 444 spin_lock(&target->srp_host->target_lock);
aef9ec39 445 list_del(&target->list);
b3589fd4 446 spin_unlock(&target->srp_host->target_lock);
aef9ec39 447
3236822b 448 srp_remove_host(target->scsi_host);
aef9ec39
RD		 449 scsi_remove_host(target->scsi_host);
450 ib_destroy_cm_id(target->cm_id);
451 srp_free_target_ib(target);
452 scsi_host_put(target->scsi_host);
aef9ec39
RD		 453}
454
455static int srp_connect_target(struct srp_target_port *target)
456{
9fe4bcf4 457 int retries = 3;
aef9ec39
RD		 458 int ret;
459
460 ret = srp_lookup_path(target);
461 if (ret)
462 return ret;
463
464 while (1) {
465 init_completion(&target->done);
466 ret = srp_send_req(target);
467 if (ret)
468 return ret;
469 wait_for_completion(&target->done);
470
471 /*
472 * The CM event handling code will set status to
473 * SRP_PORT_REDIRECT if we get a port redirect REJ
474 * back, or SRP_DLID_REDIRECT if we get a lid/qp
475 * redirect REJ back.
476 */
477 switch (target->status) {
478 case 0:
479 return 0;
480
481 case SRP_PORT_REDIRECT:
482 ret = srp_lookup_path(target);
483 if (ret)
484 return ret;
485 break;
486
487 case SRP_DLID_REDIRECT:
488 break;
489
9fe4bcf4
DD		 490 case SRP_STALE_CONN:
491 /* Our current CM id was stale, and is now in timewait.
492 * Try to reconnect with a new one.
493 */
494 if (!retries-- || srp_new_cm_id(target)) {
495 shost_printk(KERN_ERR, target->scsi_host, PFX
496 "giving up on stale connection\n");
497 target->status = -ECONNRESET;
498 return target->status;
499 }
500
501 shost_printk(KERN_ERR, target->scsi_host, PFX
502 "retrying stale connection\n");
503 break;
504
aef9ec39
RD		 505 default:
506 return target->status;
507 }
508 }
509}
510
d945e1df
RD		 511static void srp_unmap_data(struct scsi_cmnd *scmnd,
512 struct srp_target_port *target,
513 struct srp_request *req)
514{
bb350d1d 515 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 516 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
517 scmnd->sc_data_direction != DMA_FROM_DEVICE))
518 return;
519
f5358a17
RD		 520 if (req->fmr) {
521 ib_fmr_pool_unmap(req->fmr);
522 req->fmr = NULL;
523 }
524
05321937 525 ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
bb350d1d 526 scsi_sg_count(scmnd), scmnd->sc_data_direction);
d945e1df
RD		 527}
528
526b4caa
IR		 529static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
530{
531 srp_unmap_data(req->scmnd, target, req);
532 list_move_tail(&req->list, &target->free_reqs);
533}
534
535static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
536{
537 req->scmnd->result = DID_RESET << 16;
538 req->scmnd->scsi_done(req->scmnd);
539 srp_remove_req(target, req);
540}
541
aef9ec39
RD		 542static int srp_reconnect_target(struct srp_target_port *target)
543{
aef9ec39 544 struct ib_qp_attr qp_attr;
526b4caa 545 struct srp_request *req, *tmp;
aef9ec39
RD		 546 struct ib_wc wc;
547 int ret;
aef9ec39
RD		 548
549 spin_lock_irq(target->scsi_host->host_lock);
550 if (target->state != SRP_TARGET_LIVE) {
551 spin_unlock_irq(target->scsi_host->host_lock);
552 return -EAGAIN;
553 }
554 target->state = SRP_TARGET_CONNECTING;
555 spin_unlock_irq(target->scsi_host->host_lock);
556
557 srp_disconnect_target(target);
558 /*
559 * Now get a new local CM ID so that we avoid confusing the
560 * target in case things are really fouled up.
561 */
9fe4bcf4
DD		 562 ret = srp_new_cm_id(target);
563 if (ret)
aef9ec39 564 goto err;
aef9ec39
RD		 565
566 qp_attr.qp_state = IB_QPS_RESET;
567 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
568 if (ret)
569 goto err;
570
571 ret = srp_init_qp(target, target->qp);
572 if (ret)
573 goto err;
574
575 while (ib_poll_cq(target->cq, 1, &wc) > 0)
576 ; /* nothing */
577
d916a8f1 578 spin_lock_irq(target->scsi_host->host_lock);
526b4caa
IR		 579 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
580 srp_reset_req(target, req);
d916a8f1 581 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 582
583 target->rx_head = 0;
584 target->tx_head = 0;
585 target->tx_tail = 0;
aef9ec39 586
1033ff67 587 target->qp_in_error = 0;
aef9ec39
RD		 588 ret = srp_connect_target(target);
589 if (ret)
590 goto err;
591
592 spin_lock_irq(target->scsi_host->host_lock);
593 if (target->state == SRP_TARGET_CONNECTING) {
594 ret = 0;
595 target->state = SRP_TARGET_LIVE;
596 } else
597 ret = -EAGAIN;
598 spin_unlock_irq(target->scsi_host->host_lock);
599
600 return ret;
601
602err:
7aa54bd7
DD		 603 shost_printk(KERN_ERR, target->scsi_host,
604 PFX "reconnect failed (%d), removing target port.\n", ret);
aef9ec39
RD		 605
606 /*
607 * We couldn't reconnect, so kill our target port off.
608 * However, we have to defer the real removal because we might
609 * be in the context of the SCSI error handler now, which
610 * would deadlock if we call scsi_remove_host().
611 */
612 spin_lock_irq(target->scsi_host->host_lock);
613 if (target->state == SRP_TARGET_CONNECTING) {
614 target->state = SRP_TARGET_DEAD;
c4028958 615 INIT_WORK(&target->work, srp_remove_work);
aef9ec39
RD		 616 schedule_work(&target->work);
617 }
618 spin_unlock_irq(target->scsi_host->host_lock);
619
620 return ret;
621}
622
559ce8f1 623static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
f5358a17
RD		 624 int sg_cnt, struct srp_request *req,
625 struct srp_direct_buf *buf)
626{
627 u64 io_addr = 0;
628 u64 *dma_pages;
629 u32 len;
630 int page_cnt;
631 int i, j;
632 int ret;
05321937 633 struct srp_device *dev = target->srp_host->srp_dev;
85507bcc 634 struct ib_device *ibdev = dev->dev;
bb350d1d 635 struct scatterlist *sg;
f5358a17
RD		 636
637 if (!dev->fmr_pool)
638 return -ENODEV;
639
5d7cbfd6
RD		 640 if (srp_target_is_mellanox(target) &&
641 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
559ce8f1
IR		 642 return -EINVAL;
643
f5358a17 644 len = page_cnt = 0;
bb350d1d
FT		 645 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
646 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 647
bb350d1d 648 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
f5358a17
RD		 649 if (i > 0)
650 return -EINVAL;
651 else
652 ++page_cnt;
653 }
bb350d1d 654 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
f5358a17
RD		 655 ~dev->fmr_page_mask) {
656 if (i < sg_cnt - 1)
657 return -EINVAL;
658 else
659 ++page_cnt;
660 }
661
85507bcc 662 len += dma_len;
f5358a17
RD		 663 }
664
665 page_cnt += len >> dev->fmr_page_shift;
666 if (page_cnt > SRP_FMR_SIZE)
667 return -ENOMEM;
668
669 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
670 if (!dma_pages)
671 return -ENOMEM;
672
673 page_cnt = 0;
bb350d1d
FT		 674 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
675 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc
RC		 676
677 for (j = 0; j < dma_len; j += dev->fmr_page_size)
f5358a17 678 dma_pages[page_cnt++] =
bb350d1d 679 (ib_sg_dma_address(ibdev, sg) &
85507bcc
RC		 680 dev->fmr_page_mask) + j;
681 }
f5358a17
RD		 682
683 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
adfaa888 684 dma_pages, page_cnt, io_addr);
f5358a17
RD		 685 if (IS_ERR(req->fmr)) {
686 ret = PTR_ERR(req->fmr);
6583eb3d 687 req->fmr = NULL;
f5358a17
RD		 688 goto out;
689 }
690
85507bcc
RC		 691 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
692 ~dev->fmr_page_mask);
f5358a17
RD		 693 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
694 buf->len = cpu_to_be32(len);
695
696 ret = 0;
697
698out:
699 kfree(dma_pages);
700
701 return ret;
702}
703
aef9ec39
RD		 704static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
705 struct srp_request *req)
706{
cf368713 707 struct scatterlist *scat;
aef9ec39 708 struct srp_cmd *cmd = req->cmd->buf;
cf368713 709 int len, nents, count;
f5358a17 710 u8 fmt = SRP_DATA_DESC_DIRECT;
85507bcc
RC		 711 struct srp_device *dev;
712 struct ib_device *ibdev;
aef9ec39 713
bb350d1d 714 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 715 return sizeof (struct srp_cmd);
716
717 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
718 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 719 shost_printk(KERN_WARNING, target->scsi_host,
720 PFX "Unhandled data direction %d\n",
721 scmnd->sc_data_direction);
aef9ec39
RD		 722 return -EINVAL;
723 }
724
bb350d1d
FT		 725 nents = scsi_sg_count(scmnd);
726 scat = scsi_sglist(scmnd);
aef9ec39 727
05321937 728 dev = target->srp_host->srp_dev;
85507bcc
RC		 729 ibdev = dev->dev;
730
731 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
f5358a17
RD		 732
733 fmt = SRP_DATA_DESC_DIRECT;
734 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 735
cf368713 736 if (count == 1) {
f5358a17
RD		 737 /*
738 * The midlayer only generated a single gather/scatter
739 * entry, or DMA mapping coalesced everything to a
740 * single entry. So a direct descriptor along with
741 * the DMA MR suffices.
742 */
cf368713 743 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 744
85507bcc
RC		 745 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
746 buf->key = cpu_to_be32(dev->mr->rkey);
747 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
559ce8f1 748 } else if (srp_map_fmr(target, scat, count, req,
f5358a17
RD		 749 (void *) cmd->add_data)) {
750 /*
751 * FMR mapping failed, and the scatterlist has more
752 * than one entry. Generate an indirect memory
753 * descriptor.
754 */
cf368713 755 struct srp_indirect_buf *buf = (void *) cmd->add_data;
bb350d1d 756 struct scatterlist *sg;
cf368713 757 u32 datalen = 0;
f5358a17 758 int i;
aef9ec39 759
cf368713 760 fmt = SRP_DATA_DESC_INDIRECT;
f5358a17
RD		 761 len = sizeof (struct srp_cmd) +
762 sizeof (struct srp_indirect_buf) +
763 count * sizeof (struct srp_direct_buf);
764
bb350d1d
FT		 765 scsi_for_each_sg(scmnd, sg, count, i) {
766 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 767
f5358a17 768 buf->desc_list[i].va =
bb350d1d 769 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
f5358a17 770 buf->desc_list[i].key =
85507bcc
RC		 771 cpu_to_be32(dev->mr->rkey);
772 buf->desc_list[i].len = cpu_to_be32(dma_len);
773 datalen += dma_len;
f5358a17 774 }
aef9ec39 775
cf368713
RD		 776 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
777 cmd->data_out_desc_cnt = count;
778 else
779 cmd->data_in_desc_cnt = count;
780
f5358a17
RD		 781 buf->table_desc.va =
782 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
cf368713 783 buf->table_desc.key =
05321937 784 cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
cf368713
RD		 785 buf->table_desc.len =
786 cpu_to_be32(count * sizeof (struct srp_direct_buf));
787
cf368713 788 buf->len = cpu_to_be32(datalen);
aef9ec39
RD		 789 }
790
791 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
792 cmd->buf_fmt = fmt << 4;
793 else
794 cmd->buf_fmt = fmt;
795
aef9ec39
RD		 796 return len;
797}
798
aef9ec39
RD		 799static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
800{
801 struct srp_request *req;
802 struct scsi_cmnd *scmnd;
803 unsigned long flags;
804 s32 delta;
805
806 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
807
808 spin_lock_irqsave(target->scsi_host->host_lock, flags);
809
810 target->req_lim += delta;
811
812 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
813
814 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
815 if (be32_to_cpu(rsp->resp_data_len) < 4)
816 req->tsk_status = -1;
817 else
818 req->tsk_status = rsp->data[3];
819 complete(&req->done);
820 } else {
d945e1df 821 scmnd = req->scmnd;
aef9ec39 822 if (!scmnd)
7aa54bd7
DD		 823 shost_printk(KERN_ERR, target->scsi_host,
824 "Null scmnd for RSP w/tag %016llx\n",
825 (unsigned long long) rsp->tag);
aef9ec39
RD		 826 scmnd->result = rsp->status;
827
828 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
829 memcpy(scmnd->sense_buffer, rsp->data +
830 be32_to_cpu(rsp->resp_data_len),
831 min_t(int, be32_to_cpu(rsp->sense_data_len),
832 SCSI_SENSE_BUFFERSIZE));
833 }
834
835 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 836 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 837 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 838 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 839
aef9ec39 840 if (!req->tsk_mgmt) {
aef9ec39
RD		 841 scmnd->host_scribble = (void *) -1L;
842 scmnd->scsi_done(scmnd);
843
d945e1df 844 srp_remove_req(target, req);
aef9ec39
RD		 845 } else
846 req->cmd_done = 1;
847 }
848
849 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
850}
851
aef9ec39
RD		 852static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
853{
85507bcc 854 struct ib_device *dev;
aef9ec39
RD		 855 struct srp_iu *iu;
856 u8 opcode;
857
858 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
859
05321937 860 dev = target->srp_host->srp_dev->dev;
85507bcc
RC		 861 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
862 DMA_FROM_DEVICE);
aef9ec39
RD		 863
864 opcode = *(u8 *) iu->buf;
865
866 if (0) {
867 int i;
868
7aa54bd7
DD		 869 shost_printk(KERN_ERR, target->scsi_host,
870 PFX "recv completion, opcode 0x%02x\n", opcode);
aef9ec39
RD		 871
872 for (i = 0; i < wc->byte_len; ++i) {
873 if (i % 8 == 0)
874 printk(KERN_ERR " [%02x] ", i);
875 printk(" %02x", ((u8 *) iu->buf)[i]);
876 if ((i + 1) % 8 == 0)
877 printk("\n");
878 }
879
880 if (wc->byte_len % 8)
881 printk("\n");
882 }
883
884 switch (opcode) {
885 case SRP_RSP:
886 srp_process_rsp(target, iu->buf);
887 break;
888
889 case SRP_T_LOGOUT:
890 /* XXX Handle target logout */
7aa54bd7
DD		 891 shost_printk(KERN_WARNING, target->scsi_host,
892 PFX "Got target logout request\n");
aef9ec39
RD		 893 break;
894
895 default:
7aa54bd7
DD		 896 shost_printk(KERN_WARNING, target->scsi_host,
897 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 898 break;
899 }
900
85507bcc
RC		 901 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
902 DMA_FROM_DEVICE);
aef9ec39
RD		 903}
904
905static void srp_completion(struct ib_cq *cq, void *target_ptr)
906{
907 struct srp_target_port *target = target_ptr;
908 struct ib_wc wc;
aef9ec39
RD		 909
910 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
911 while (ib_poll_cq(cq, 1, &wc) > 0) {
912 if (wc.status) {
7aa54bd7
DD		 913 shost_printk(KERN_ERR, target->scsi_host,
914 PFX "failed %s status %d\n",
915 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
916 wc.status);
1033ff67 917 target->qp_in_error = 1;
aef9ec39
RD		 918 break;
919 }
920
921 if (wc.wr_id & SRP_OP_RECV)
922 srp_handle_recv(target, &wc);
923 else
924 ++target->tx_tail;
925 }
926}
927
928static int __srp_post_recv(struct srp_target_port *target)
929{
930 struct srp_iu *iu;
931 struct ib_sge list;
932 struct ib_recv_wr wr, *bad_wr;
933 unsigned int next;
934 int ret;
935
936 next = target->rx_head & (SRP_RQ_SIZE - 1);
937 wr.wr_id = next | SRP_OP_RECV;
938 iu = target->rx_ring[next];
939
940 list.addr = iu->dma;
941 list.length = iu->size;
05321937 942 list.lkey = target->srp_host->srp_dev->mr->lkey;
aef9ec39
RD		 943
944 wr.next = NULL;
945 wr.sg_list = &list;
946 wr.num_sge = 1;
947
948 ret = ib_post_recv(target->qp, &wr, &bad_wr);
949 if (!ret)
950 ++target->rx_head;
951
952 return ret;
953}
954
955static int srp_post_recv(struct srp_target_port *target)
956{
957 unsigned long flags;
958 int ret;
959
960 spin_lock_irqsave(target->scsi_host->host_lock, flags);
961 ret = __srp_post_recv(target);
962 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
963
964 return ret;
965}
966
967/*
968 * Must be called with target->scsi_host->host_lock held to protect
47f2bce9
RD		 969 * req_lim and tx_head. Lock cannot be dropped between call here and
970 * call to __srp_post_send().
aef9ec39 971 */
8cba2077
DD		 972static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
973 enum srp_request_type req_type)
aef9ec39 974{
8cba2077
DD		 975 s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
976
aef9ec39
RD		 977 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
978 return NULL;
979
8cba2077 980 if (target->req_lim < min) {
6bfa24fa 981 ++target->zero_req_lim;
8cba2077
DD		 982 return NULL;
983 }
47f2bce9 984
aef9ec39
RD		 985 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
986}
987
988/*
989 * Must be called with target->scsi_host->host_lock held to protect
990 * req_lim and tx_head.
991 */
992static int __srp_post_send(struct srp_target_port *target,
993 struct srp_iu *iu, int len)
994{
995 struct ib_sge list;
996 struct ib_send_wr wr, *bad_wr;
997 int ret = 0;
998
aef9ec39
RD		 999 list.addr = iu->dma;
1000 list.length = len;
05321937 1001 list.lkey = target->srp_host->srp_dev->mr->lkey;
aef9ec39
RD		 1002
1003 wr.next = NULL;
1004 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
1005 wr.sg_list = &list;
1006 wr.num_sge = 1;
1007 wr.opcode = IB_WR_SEND;
1008 wr.send_flags = IB_SEND_SIGNALED;
1009
1010 ret = ib_post_send(target->qp, &wr, &bad_wr);
1011
1012 if (!ret) {
1013 ++target->tx_head;
1014 --target->req_lim;
1015 }
1016
1017 return ret;
1018}
1019
1020static int srp_queuecommand(struct scsi_cmnd *scmnd,
1021 void (*done)(struct scsi_cmnd *))
1022{
1023 struct srp_target_port *target = host_to_target(scmnd->device->host);
1024 struct srp_request *req;
1025 struct srp_iu *iu;
1026 struct srp_cmd *cmd;
85507bcc 1027 struct ib_device *dev;
aef9ec39
RD		 1028 int len;
1029
1030 if (target->state == SRP_TARGET_CONNECTING)
1031 goto err;
1032
1033 if (target->state == SRP_TARGET_DEAD ||
1034 target->state == SRP_TARGET_REMOVED) {
1035 scmnd->result = DID_BAD_TARGET << 16;
1036 done(scmnd);
1037 return 0;
1038 }
1039
8cba2077 1040 iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
aef9ec39
RD		 1041 if (!iu)
1042 goto err;
1043
05321937 1044 dev = target->srp_host->srp_dev->dev;
85507bcc
RC		 1045 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1046 DMA_TO_DEVICE);
aef9ec39 1047
d945e1df 1048 req = list_entry(target->free_reqs.next, struct srp_request, list);
aef9ec39
RD		 1049
1050 scmnd->scsi_done = done;
1051 scmnd->result = 0;
d945e1df 1052 scmnd->host_scribble = (void *) (long) req->index;
aef9ec39
RD		 1053
1054 cmd = iu->buf;
1055 memset(cmd, 0, sizeof *cmd);
1056
1057 cmd->opcode = SRP_CMD;
1058 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1059 cmd->tag = req->index;
aef9ec39
RD		 1060 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1061
aef9ec39
RD		 1062 req->scmnd = scmnd;
1063 req->cmd = iu;
1064 req->cmd_done = 0;
1065 req->tsk_mgmt = NULL;
1066
1067 len = srp_map_data(scmnd, target, req);
1068 if (len < 0) {
7aa54bd7
DD		 1069 shost_printk(KERN_ERR, target->scsi_host,
1070 PFX "Failed to map data\n");
aef9ec39
RD		 1071 goto err;
1072 }
1073
1074 if (__srp_post_recv(target)) {
7aa54bd7 1075 shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
aef9ec39
RD		 1076 goto err_unmap;
1077 }
1078
85507bcc
RC		 1079 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1080 DMA_TO_DEVICE);
aef9ec39
RD		 1081
1082 if (__srp_post_send(target, iu, len)) {
7aa54bd7 1083 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1084 goto err_unmap;
1085 }
1086
d945e1df 1087 list_move_tail(&req->list, &target->req_queue);
aef9ec39
RD		 1088
1089 return 0;
1090
1091err_unmap:
1092 srp_unmap_data(scmnd, target, req);
1093
1094err:
1095 return SCSI_MLQUEUE_HOST_BUSY;
1096}
1097
1098static int srp_alloc_iu_bufs(struct srp_target_port *target)
1099{
1100 int i;
1101
1102 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1103 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1104 target->max_ti_iu_len,
1105 GFP_KERNEL, DMA_FROM_DEVICE);
1106 if (!target->rx_ring[i])
1107 goto err;
1108 }
1109
1110 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1111 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
74b0a15b 1112 srp_max_iu_len,
aef9ec39
RD		 1113 GFP_KERNEL, DMA_TO_DEVICE);
1114 if (!target->tx_ring[i])
1115 goto err;
1116 }
1117
1118 return 0;
1119
1120err:
1121 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1122 srp_free_iu(target->srp_host, target->rx_ring[i]);
1123 target->rx_ring[i] = NULL;
1124 }
1125
1126 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1127 srp_free_iu(target->srp_host, target->tx_ring[i]);
1128 target->tx_ring[i] = NULL;
1129 }
1130
1131 return -ENOMEM;
1132}
1133
1134static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1135 struct ib_cm_event *event,
1136 struct srp_target_port *target)
1137{
7aa54bd7 1138 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1139 struct ib_class_port_info *cpi;
1140 int opcode;
1141
1142 switch (event->param.rej_rcvd.reason) {
1143 case IB_CM_REJ_PORT_CM_REDIRECT:
1144 cpi = event->param.rej_rcvd.ari;
1145 target->path.dlid = cpi->redirect_lid;
1146 target->path.pkey = cpi->redirect_pkey;
1147 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1148 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1149
1150 target->status = target->path.dlid ?
1151 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1152 break;
1153
1154 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1155 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1156 /*
1157 * Topspin/Cisco SRP gateways incorrectly send
1158 * reject reason code 25 when they mean 24
1159 * (port redirect).
1160 */
1161 memcpy(target->path.dgid.raw,
1162 event->param.rej_rcvd.ari, 16);
1163
7aa54bd7
DD		 1164 shost_printk(KERN_DEBUG, shost,
1165 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1166 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1167 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1168
1169 target->status = SRP_PORT_REDIRECT;
1170 } else {
7aa54bd7
DD		 1171 shost_printk(KERN_WARNING, shost,
1172 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1173 target->status = -ECONNRESET;
1174 }
1175 break;
1176
1177 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1178 shost_printk(KERN_WARNING, shost,
1179 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1180 target->status = -ECONNRESET;
1181 break;
1182
1183 case IB_CM_REJ_CONSUMER_DEFINED:
1184 opcode = *(u8 *) event->private_data;
1185 if (opcode == SRP_LOGIN_REJ) {
1186 struct srp_login_rej *rej = event->private_data;
1187 u32 reason = be32_to_cpu(rej->reason);
1188
1189 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1190 shost_printk(KERN_WARNING, shost,
1191 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1192 else
7aa54bd7
DD		 1193 shost_printk(KERN_WARNING, shost,
1194 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
aef9ec39 1195 } else
7aa54bd7
DD		 1196 shost_printk(KERN_WARNING, shost,
1197 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1198 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1199 target->status = -ECONNRESET;
1200 break;
1201
9fe4bcf4
DD		 1202 case IB_CM_REJ_STALE_CONN:
1203 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1204 target->status = SRP_STALE_CONN;
1205 break;
1206
aef9ec39 1207 default:
7aa54bd7
DD		 1208 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1209 event->param.rej_rcvd.reason);
aef9ec39
RD		 1210 target->status = -ECONNRESET;
1211 }
1212}
1213
1214static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1215{
1216 struct srp_target_port *target = cm_id->context;
1217 struct ib_qp_attr *qp_attr = NULL;
1218 int attr_mask = 0;
1219 int comp = 0;
1220 int opcode = 0;
1221
1222 switch (event->event) {
1223 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1224 shost_printk(KERN_DEBUG, target->scsi_host,
1225 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1226 comp = 1;
1227 target->status = -ECONNRESET;
1228 break;
1229
1230 case IB_CM_REP_RECEIVED:
1231 comp = 1;
1232 opcode = *(u8 *) event->private_data;
1233
1234 if (opcode == SRP_LOGIN_RSP) {
1235 struct srp_login_rsp *rsp = event->private_data;
1236
1237 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1238 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1239
1240 target->scsi_host->can_queue = min(target->req_lim,
1241 target->scsi_host->can_queue);
1242 } else {
7aa54bd7
DD		 1243 shost_printk(KERN_WARNING, target->scsi_host,
1244 PFX "Unhandled RSP opcode %#x\n", opcode);
aef9ec39
RD		 1245 target->status = -ECONNRESET;
1246 break;
1247 }
1248
d2fcea7d
VP		 1249 if (!target->rx_ring[0]) {
1250 target->status = srp_alloc_iu_bufs(target);
1251 if (target->status)
1252 break;
1253 }
aef9ec39
RD		 1254
1255 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1256 if (!qp_attr) {
1257 target->status = -ENOMEM;
1258 break;
1259 }
1260
1261 qp_attr->qp_state = IB_QPS_RTR;
1262 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1263 if (target->status)
1264 break;
1265
1266 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1267 if (target->status)
1268 break;
1269
1270 target->status = srp_post_recv(target);
1271 if (target->status)
1272 break;
1273
1274 qp_attr->qp_state = IB_QPS_RTS;
1275 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1276 if (target->status)
1277 break;
1278
1279 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1280 if (target->status)
1281 break;
1282
1283 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1284 if (target->status)
1285 break;
1286
1287 break;
1288
1289 case IB_CM_REJ_RECEIVED:
7aa54bd7 1290 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1291 comp = 1;
1292
1293 srp_cm_rej_handler(cm_id, event, target);
1294 break;
1295
b7ac4ab4 1296 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1297 shost_printk(KERN_WARNING, target->scsi_host,
1298 PFX "DREQ received - connection closed\n");
b7ac4ab4 1299 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1300 shost_printk(KERN_ERR, target->scsi_host,
1301 PFX "Sending CM DREP failed\n");
aef9ec39
RD		 1302 break;
1303
1304 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1305 shost_printk(KERN_ERR, target->scsi_host,
1306 PFX "connection closed\n");
aef9ec39
RD		 1307
1308 comp = 1;
1309 target->status = 0;
1310 break;
1311
b7ac4ab4
IR		 1312 case IB_CM_MRA_RECEIVED:
1313 case IB_CM_DREQ_ERROR:
1314 case IB_CM_DREP_RECEIVED:
1315 break;
1316
aef9ec39 1317 default:
7aa54bd7
DD		 1318 shost_printk(KERN_WARNING, target->scsi_host,
1319 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1320 break;
1321 }
1322
1323 if (comp)
1324 complete(&target->done);
1325
1326 kfree(qp_attr);
1327
1328 return 0;
1329}
1330
d945e1df
RD		 1331static int srp_send_tsk_mgmt(struct srp_target_port *target,
1332 struct srp_request *req, u8 func)
aef9ec39 1333{
aef9ec39
RD		 1334 struct srp_iu *iu;
1335 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39
RD		 1336
1337 spin_lock_irq(target->scsi_host->host_lock);
1338
1285b3a0
RD		 1339 if (target->state == SRP_TARGET_DEAD ||
1340 target->state == SRP_TARGET_REMOVED) {
d945e1df 1341 req->scmnd->result = DID_BAD_TARGET << 16;
1285b3a0
RD		 1342 goto out;
1343 }
1344
aef9ec39
RD		 1345 init_completion(&req->done);
1346
8cba2077 1347 iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
aef9ec39
RD		 1348 if (!iu)
1349 goto out;
1350
1351 tsk_mgmt = iu->buf;
1352 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1353
1354 tsk_mgmt->opcode = SRP_TSK_MGMT;
d945e1df
RD		 1355 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1356 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
aef9ec39 1357 tsk_mgmt->tsk_mgmt_func = func;
d945e1df 1358 tsk_mgmt->task_tag = req->index;
aef9ec39
RD		 1359
1360 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1361 goto out;
1362
1363 req->tsk_mgmt = iu;
1364
1365 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df 1366
aef9ec39
RD		 1367 if (!wait_for_completion_timeout(&req->done,
1368 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1369 return -1;
aef9ec39 1370
d945e1df 1371 return 0;
aef9ec39
RD		 1372
1373out:
1374 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df
RD		 1375 return -1;
1376}
1377
1378static int srp_find_req(struct srp_target_port *target,
1379 struct scsi_cmnd *scmnd,
1380 struct srp_request **req)
1381{
1382 if (scmnd->host_scribble == (void *) -1L)
1383 return -1;
1384
1385 *req = &target->req_ring[(long) scmnd->host_scribble];
1386
1387 return 0;
aef9ec39
RD		 1388}
1389
1390static int srp_abort(struct scsi_cmnd *scmnd)
1391{
d945e1df
RD		 1392 struct srp_target_port *target = host_to_target(scmnd->device->host);
1393 struct srp_request *req;
1394 int ret = SUCCESS;
1395
7aa54bd7 1396 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 1397
1033ff67
IR		 1398 if (target->qp_in_error)
1399 return FAILED;
d945e1df
RD		 1400 if (srp_find_req(target, scmnd, &req))
1401 return FAILED;
1402 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1403 return FAILED;
1404
1405 spin_lock_irq(target->scsi_host->host_lock);
1406
1407 if (req->cmd_done) {
1408 srp_remove_req(target, req);
1409 scmnd->scsi_done(scmnd);
1410 } else if (!req->tsk_status) {
1411 srp_remove_req(target, req);
1412 scmnd->result = DID_ABORT << 16;
1413 } else
1414 ret = FAILED;
1415
1416 spin_unlock_irq(target->scsi_host->host_lock);
1417
1418 return ret;
aef9ec39
RD		 1419}
1420
1421static int srp_reset_device(struct scsi_cmnd *scmnd)
1422{
d945e1df
RD		 1423 struct srp_target_port *target = host_to_target(scmnd->device->host);
1424 struct srp_request *req, *tmp;
1425
7aa54bd7 1426 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 1427
1033ff67
IR		 1428 if (target->qp_in_error)
1429 return FAILED;
d945e1df
RD		 1430 if (srp_find_req(target, scmnd, &req))
1431 return FAILED;
1432 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1433 return FAILED;
1434 if (req->tsk_status)
1435 return FAILED;
1436
1437 spin_lock_irq(target->scsi_host->host_lock);
1438
1439 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
526b4caa
IR		 1440 if (req->scmnd->device == scmnd->device)
1441 srp_reset_req(target, req);
d945e1df
RD		 1442
1443 spin_unlock_irq(target->scsi_host->host_lock);
1444
1445 return SUCCESS;
aef9ec39
RD		 1446}
1447
1448static int srp_reset_host(struct scsi_cmnd *scmnd)
1449{
1450 struct srp_target_port *target = host_to_target(scmnd->device->host);
1451 int ret = FAILED;
1452
7aa54bd7 1453 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39
RD		 1454
1455 if (!srp_reconnect_target(target))
1456 ret = SUCCESS;
1457
1458 return ret;
1459}
1460
ee959b00
TJ		 1461static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1462 char *buf)
6ecb0c84 1463{
ee959b00 1464 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1465
1466 if (target->state == SRP_TARGET_DEAD ||
1467 target->state == SRP_TARGET_REMOVED)
1468 return -ENODEV;
1469
1470 return sprintf(buf, "0x%016llx\n",
1471 (unsigned long long) be64_to_cpu(target->id_ext));
1472}
1473
ee959b00
TJ		 1474static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1475 char *buf)
6ecb0c84 1476{
ee959b00 1477 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1478
1479 if (target->state == SRP_TARGET_DEAD ||
1480 target->state == SRP_TARGET_REMOVED)
1481 return -ENODEV;
1482
1483 return sprintf(buf, "0x%016llx\n",
1484 (unsigned long long) be64_to_cpu(target->ioc_guid));
1485}
1486
ee959b00
TJ		 1487static ssize_t show_service_id(struct device *dev,
1488 struct device_attribute *attr, char *buf)
6ecb0c84 1489{
ee959b00 1490 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1491
1492 if (target->state == SRP_TARGET_DEAD ||
1493 target->state == SRP_TARGET_REMOVED)
1494 return -ENODEV;
1495
1496 return sprintf(buf, "0x%016llx\n",
1497 (unsigned long long) be64_to_cpu(target->service_id));
1498}
1499
ee959b00
TJ		 1500static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1501 char *buf)
6ecb0c84 1502{
ee959b00 1503 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1504
1505 if (target->state == SRP_TARGET_DEAD ||
1506 target->state == SRP_TARGET_REMOVED)
1507 return -ENODEV;
1508
1509 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1510}
1511
ee959b00
TJ		 1512static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1513 char *buf)
6ecb0c84 1514{
ee959b00 1515 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1516
1517 if (target->state == SRP_TARGET_DEAD ||
1518 target->state == SRP_TARGET_REMOVED)
1519 return -ENODEV;
1520
1521 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1522 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1523 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1524 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1525 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1526 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1527 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1528 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1529 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1530}
1531
ee959b00
TJ		 1532static ssize_t show_orig_dgid(struct device *dev,
1533 struct device_attribute *attr, char *buf)
3633b3d0 1534{
ee959b00 1535 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0
IR		 1536
1537 if (target->state == SRP_TARGET_DEAD ||
1538 target->state == SRP_TARGET_REMOVED)
1539 return -ENODEV;
1540
1541 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1542 be16_to_cpu(target->orig_dgid[0]),
1543 be16_to_cpu(target->orig_dgid[1]),
1544 be16_to_cpu(target->orig_dgid[2]),
1545 be16_to_cpu(target->orig_dgid[3]),
1546 be16_to_cpu(target->orig_dgid[4]),
1547 be16_to_cpu(target->orig_dgid[5]),
1548 be16_to_cpu(target->orig_dgid[6]),
1549 be16_to_cpu(target->orig_dgid[7]));
1550}
1551
ee959b00
TJ		 1552static ssize_t show_zero_req_lim(struct device *dev,
1553 struct device_attribute *attr, char *buf)
6bfa24fa 1554{
ee959b00 1555 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa
RD		 1556
1557 if (target->state == SRP_TARGET_DEAD ||
1558 target->state == SRP_TARGET_REMOVED)
1559 return -ENODEV;
1560
1561 return sprintf(buf, "%d\n", target->zero_req_lim);
1562}
1563
ee959b00
TJ		 1564static ssize_t show_local_ib_port(struct device *dev,
1565 struct device_attribute *attr, char *buf)
ded7f1a1 1566{
ee959b00 1567 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 1568
1569 return sprintf(buf, "%d\n", target->srp_host->port);
1570}
1571
ee959b00
TJ		 1572static ssize_t show_local_ib_device(struct device *dev,
1573 struct device_attribute *attr, char *buf)
ded7f1a1 1574{
ee959b00 1575 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 1576
05321937 1577 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 1578}
1579
ee959b00
TJ		 1580static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1581static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1582static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1583static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1584static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1585static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1586static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1587static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1588static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1589
1590static struct device_attribute *srp_host_attrs[] = {
1591 &dev_attr_id_ext,
1592 &dev_attr_ioc_guid,
1593 &dev_attr_service_id,
1594 &dev_attr_pkey,
1595 &dev_attr_dgid,
1596 &dev_attr_orig_dgid,
1597 &dev_attr_zero_req_lim,
1598 &dev_attr_local_ib_port,
1599 &dev_attr_local_ib_device,
6ecb0c84
RD		 1600 NULL
1601};
1602
aef9ec39
RD		 1603static struct scsi_host_template srp_template = {
1604 .module = THIS_MODULE,
b7f008fd
RD		 1605 .name = "InfiniBand SRP initiator",
1606 .proc_name = DRV_NAME,
aef9ec39
RD		 1607 .info = srp_target_info,
1608 .queuecommand = srp_queuecommand,
1609 .eh_abort_handler = srp_abort,
1610 .eh_device_reset_handler = srp_reset_device,
1611 .eh_host_reset_handler = srp_reset_host,
1612 .can_queue = SRP_SQ_SIZE,
1613 .this_id = -1,
aef9ec39 1614 .cmd_per_lun = SRP_SQ_SIZE,
6ecb0c84
RD		 1615 .use_clustering = ENABLE_CLUSTERING,
1616 .shost_attrs = srp_host_attrs
aef9ec39
RD		 1617};
1618
1619static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1620{
3236822b
FT		 1621 struct srp_rport_identifiers ids;
1622 struct srp_rport *rport;
1623
aef9ec39
RD		 1624 sprintf(target->target_name, "SRP.T10:%016llX",
1625 (unsigned long long) be64_to_cpu(target->id_ext));
1626
05321937 1627 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 1628 return -ENODEV;
1629
3236822b
FT		 1630 memcpy(ids.port_id, &target->id_ext, 8);
1631 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 1632 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 1633 rport = srp_rport_add(target->scsi_host, &ids);
1634 if (IS_ERR(rport)) {
1635 scsi_remove_host(target->scsi_host);
1636 return PTR_ERR(rport);
1637 }
1638
b3589fd4 1639 spin_lock(&host->target_lock);
aef9ec39 1640 list_add_tail(&target->list, &host->target_list);
b3589fd4 1641 spin_unlock(&host->target_lock);
aef9ec39
RD		 1642
1643 target->state = SRP_TARGET_LIVE;
1644
aef9ec39 1645 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 1646 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 1647
1648 return 0;
1649}
1650
ee959b00 1651static void srp_release_dev(struct device *dev)
aef9ec39
RD		 1652{
1653 struct srp_host *host =
ee959b00 1654 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1655
1656 complete(&host->released);
1657}
1658
1659static struct class srp_class = {
1660 .name = "infiniband_srp",
ee959b00 1661 .dev_release = srp_release_dev
aef9ec39
RD		 1662};
1663
1664/*
1665 * Target ports are added by writing
1666 *
1667 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1668 * pkey=<P_Key>,service_id=<service ID>
1669 *
1670 * to the add_target sysfs attribute.
1671 */
1672enum {
1673 SRP_OPT_ERR = 0,
1674 SRP_OPT_ID_EXT = 1 << 0,
1675 SRP_OPT_IOC_GUID = 1 << 1,
1676 SRP_OPT_DGID = 1 << 2,
1677 SRP_OPT_PKEY = 1 << 3,
1678 SRP_OPT_SERVICE_ID = 1 << 4,
1679 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 1680 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 1681 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 1682 SRP_OPT_INITIATOR_EXT = 1 << 8,
aef9ec39
RD		 1683 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1684 SRP_OPT_IOC_GUID |
1685 SRP_OPT_DGID |
1686 SRP_OPT_PKEY |
1687 SRP_OPT_SERVICE_ID),
1688};
1689
1690static match_table_t srp_opt_tokens = {
52fb2b50
VP		 1691 { SRP_OPT_ID_EXT, "id_ext=%s" },
1692 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1693 { SRP_OPT_DGID, "dgid=%s" },
1694 { SRP_OPT_PKEY, "pkey=%x" },
1695 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1696 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1697 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 1698 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 1699 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
52fb2b50 1700 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 1701};
1702
1703static int srp_parse_options(const char *buf, struct srp_target_port *target)
1704{
1705 char *options, *sep_opt;
1706 char *p;
1707 char dgid[3];
1708 substring_t args[MAX_OPT_ARGS];
1709 int opt_mask = 0;
1710 int token;
1711 int ret = -EINVAL;
1712 int i;
1713
1714 options = kstrdup(buf, GFP_KERNEL);
1715 if (!options)
1716 return -ENOMEM;
1717
1718 sep_opt = options;
1719 while ((p = strsep(&sep_opt, ",")) != NULL) {
1720 if (!*p)
1721 continue;
1722
1723 token = match_token(p, srp_opt_tokens, args);
1724 opt_mask |= token;
1725
1726 switch (token) {
1727 case SRP_OPT_ID_EXT:
1728 p = match_strdup(args);
a20f3a6d
IR		 1729 if (!p) {
1730 ret = -ENOMEM;
1731 goto out;
1732 }
aef9ec39
RD		 1733 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1734 kfree(p);
1735 break;
1736
1737 case SRP_OPT_IOC_GUID:
1738 p = match_strdup(args);
a20f3a6d
IR		 1739 if (!p) {
1740 ret = -ENOMEM;
1741 goto out;
1742 }
aef9ec39
RD		 1743 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1744 kfree(p);
1745 break;
1746
1747 case SRP_OPT_DGID:
1748 p = match_strdup(args);
a20f3a6d
IR		 1749 if (!p) {
1750 ret = -ENOMEM;
1751 goto out;
1752 }
aef9ec39
RD		 1753 if (strlen(p) != 32) {
1754 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
ce1823f0 1755 kfree(p);
aef9ec39
RD		 1756 goto out;
1757 }
1758
1759 for (i = 0; i < 16; ++i) {
1760 strlcpy(dgid, p + i * 2, 3);
1761 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1762 }
bf17c1c7 1763 kfree(p);
3633b3d0 1764 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 1765 break;
1766
1767 case SRP_OPT_PKEY:
1768 if (match_hex(args, &token)) {
1769 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1770 goto out;
1771 }
1772 target->path.pkey = cpu_to_be16(token);
1773 break;
1774
1775 case SRP_OPT_SERVICE_ID:
1776 p = match_strdup(args);
a20f3a6d
IR		 1777 if (!p) {
1778 ret = -ENOMEM;
1779 goto out;
1780 }
aef9ec39 1781 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 1782 target->path.service_id = target->service_id;
aef9ec39
RD		 1783 kfree(p);
1784 break;
1785
1786 case SRP_OPT_MAX_SECT:
1787 if (match_int(args, &token)) {
1788 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1789 goto out;
1790 }
1791 target->scsi_host->max_sectors = token;
1792 break;
1793
52fb2b50
VP		 1794 case SRP_OPT_MAX_CMD_PER_LUN:
1795 if (match_int(args, &token)) {
1796 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1797 goto out;
1798 }
1799 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1800 break;
1801
0c0450db
R		 1802 case SRP_OPT_IO_CLASS:
1803 if (match_hex(args, &token)) {
1804 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1805 goto out;
1806 }
1807 if (token != SRP_REV10_IB_IO_CLASS &&
1808 token != SRP_REV16A_IB_IO_CLASS) {
1809 printk(KERN_WARNING PFX "unknown IO class parameter value"
1810 " %x specified (use %x or %x).\n",
1811 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1812 goto out;
1813 }
1814 target->io_class = token;
1815 break;
1816
01cb9bcb
IR		 1817 case SRP_OPT_INITIATOR_EXT:
1818 p = match_strdup(args);
a20f3a6d
IR		 1819 if (!p) {
1820 ret = -ENOMEM;
1821 goto out;
1822 }
01cb9bcb
IR		 1823 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1824 kfree(p);
1825 break;
1826
aef9ec39
RD		 1827 default:
1828 printk(KERN_WARNING PFX "unknown parameter or missing value "
1829 "'%s' in target creation request\n", p);
1830 goto out;
1831 }
1832 }
1833
1834 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1835 ret = 0;
1836 else
1837 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1838 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1839 !(srp_opt_tokens[i].token & opt_mask))
1840 printk(KERN_WARNING PFX "target creation request is "
1841 "missing parameter '%s'\n",
1842 srp_opt_tokens[i].pattern);
1843
1844out:
1845 kfree(options);
1846 return ret;
1847}
1848
ee959b00
TJ		 1849static ssize_t srp_create_target(struct device *dev,
1850 struct device_attribute *attr,
aef9ec39
RD		 1851 const char *buf, size_t count)
1852{
1853 struct srp_host *host =
ee959b00 1854 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1855 struct Scsi_Host *target_host;
1856 struct srp_target_port *target;
1857 int ret;
1858 int i;
1859
1860 target_host = scsi_host_alloc(&srp_template,
1861 sizeof (struct srp_target_port));
1862 if (!target_host)
1863 return -ENOMEM;
1864
3236822b 1865 target_host->transportt = ib_srp_transport_template;
3c8edf0e
AR		 1866 target_host->max_lun = SRP_MAX_LUN;
1867 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 1868
aef9ec39 1869 target = host_to_target(target_host);
aef9ec39 1870
0c0450db 1871 target->io_class = SRP_REV16A_IB_IO_CLASS;
aef9ec39
RD		 1872 target->scsi_host = target_host;
1873 target->srp_host = host;
1874
d945e1df 1875 INIT_LIST_HEAD(&target->free_reqs);
aef9ec39 1876 INIT_LIST_HEAD(&target->req_queue);
d945e1df
RD		 1877 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1878 target->req_ring[i].index = i;
1879 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1880 }
aef9ec39
RD		 1881
1882 ret = srp_parse_options(buf, target);
1883 if (ret)
1884 goto err;
1885
05321937
GKH		 1886 ib_get_cached_gid(host->srp_dev->dev, host->port, 0,
1887 &target->path.sgid);
aef9ec39 1888
7aa54bd7
DD		 1889 shost_printk(KERN_DEBUG, target->scsi_host, PFX
1890 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1891 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
aef9ec39
RD		 1892 (unsigned long long) be64_to_cpu(target->id_ext),
1893 (unsigned long long) be64_to_cpu(target->ioc_guid),
1894 be16_to_cpu(target->path.pkey),
1895 (unsigned long long) be64_to_cpu(target->service_id),
1896 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1897 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1898 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1899 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1900 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1901 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1902 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1903 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1904
1905 ret = srp_create_target_ib(target);
1906 if (ret)
1907 goto err;
1908
9fe4bcf4
DD		 1909 ret = srp_new_cm_id(target);
1910 if (ret)
aef9ec39 1911 goto err_free;
aef9ec39 1912
1033ff67 1913 target->qp_in_error = 0;
aef9ec39
RD		 1914 ret = srp_connect_target(target);
1915 if (ret) {
7aa54bd7
DD		 1916 shost_printk(KERN_ERR, target->scsi_host,
1917 PFX "Connection failed\n");
aef9ec39
RD		 1918 goto err_cm_id;
1919 }
1920
1921 ret = srp_add_target(host, target);
1922 if (ret)
1923 goto err_disconnect;
1924
1925 return count;
1926
1927err_disconnect:
1928 srp_disconnect_target(target);
1929
1930err_cm_id:
1931 ib_destroy_cm_id(target->cm_id);
1932
1933err_free:
1934 srp_free_target_ib(target);
1935
1936err:
1937 scsi_host_put(target_host);
1938
1939 return ret;
1940}
1941
ee959b00 1942static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 1943
ee959b00
TJ		 1944static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1945 char *buf)
aef9ec39 1946{
ee959b00 1947 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 1948
05321937 1949 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 1950}
1951
ee959b00 1952static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 1953
ee959b00
TJ		 1954static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1955 char *buf)
aef9ec39 1956{
ee959b00 1957 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1958
1959 return sprintf(buf, "%d\n", host->port);
1960}
1961
ee959b00 1962static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 1963
f5358a17 1964static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 1965{
1966 struct srp_host *host;
1967
1968 host = kzalloc(sizeof *host, GFP_KERNEL);
1969 if (!host)
1970 return NULL;
1971
1972 INIT_LIST_HEAD(&host->target_list);
b3589fd4 1973 spin_lock_init(&host->target_lock);
aef9ec39 1974 init_completion(&host->released);
05321937 1975 host->srp_dev = device;
aef9ec39
RD		 1976 host->port = port;
1977
ee959b00
TJ		 1978 host->dev.class = &srp_class;
1979 host->dev.parent = device->dev->dma_device;
1980 snprintf(host->dev.bus_id, BUS_ID_SIZE, "srp-%s-%d",
f5358a17 1981 device->dev->name, port);
aef9ec39 1982
ee959b00 1983 if (device_register(&host->dev))
f5358a17 1984 goto free_host;
ee959b00 1985 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 1986 goto err_class;
ee959b00 1987 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 1988 goto err_class;
ee959b00 1989 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 1990 goto err_class;
1991
1992 return host;
1993
1994err_class:
ee959b00 1995 device_unregister(&host->dev);
aef9ec39 1996
f5358a17 1997free_host:
aef9ec39
RD		 1998 kfree(host);
1999
2000 return NULL;
2001}
2002
2003static void srp_add_one(struct ib_device *device)
2004{
f5358a17
RD		 2005 struct srp_device *srp_dev;
2006 struct ib_device_attr *dev_attr;
2007 struct ib_fmr_pool_param fmr_param;
aef9ec39 2008 struct srp_host *host;
aef9ec39
RD		 2009 int s, e, p;
2010
f5358a17
RD		 2011 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2012 if (!dev_attr)
cf311cd4 2013 return;
aef9ec39 2014
f5358a17
RD		 2015 if (ib_query_device(device, dev_attr)) {
2016 printk(KERN_WARNING PFX "Query device failed for %s\n",
2017 device->name);
2018 goto free_attr;
2019 }
2020
2021 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2022 if (!srp_dev)
2023 goto free_attr;
2024
2025 /*
2026 * Use the smallest page size supported by the HCA, down to a
2027 * minimum of 512 bytes (which is the smallest sector that a
2028 * SCSI command will ever carry).
2029 */
2030 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2031 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
bf628dc2 2032 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
f5358a17
RD		 2033
2034 INIT_LIST_HEAD(&srp_dev->dev_list);
2035
2036 srp_dev->dev = device;
2037 srp_dev->pd = ib_alloc_pd(device);
2038 if (IS_ERR(srp_dev->pd))
2039 goto free_dev;
2040
2041 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2042 IB_ACCESS_LOCAL_WRITE |
2043 IB_ACCESS_REMOTE_READ |
2044 IB_ACCESS_REMOTE_WRITE);
2045 if (IS_ERR(srp_dev->mr))
2046 goto err_pd;
2047
2048 memset(&fmr_param, 0, sizeof fmr_param);
2049 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2050 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2051 fmr_param.cache = 1;
2052 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2053 fmr_param.page_shift = srp_dev->fmr_page_shift;
2054 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2055 IB_ACCESS_REMOTE_WRITE |
2056 IB_ACCESS_REMOTE_READ);
2057
2058 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2059 if (IS_ERR(srp_dev->fmr_pool))
2060 srp_dev->fmr_pool = NULL;
aef9ec39 2061
07ebafba 2062 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2063 s = 0;
2064 e = 0;
2065 } else {
2066 s = 1;
2067 e = device->phys_port_cnt;
2068 }
2069
2070 for (p = s; p <= e; ++p) {
f5358a17 2071 host = srp_add_port(srp_dev, p);
aef9ec39 2072 if (host)
f5358a17 2073 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2074 }
2075
f5358a17
RD		 2076 ib_set_client_data(device, &srp_client, srp_dev);
2077
2078 goto free_attr;
2079
2080err_pd:
2081 ib_dealloc_pd(srp_dev->pd);
2082
2083free_dev:
2084 kfree(srp_dev);
2085
2086free_attr:
2087 kfree(dev_attr);
aef9ec39
RD		 2088}
2089
2090static void srp_remove_one(struct ib_device *device)
2091{
f5358a17 2092 struct srp_device *srp_dev;
aef9ec39
RD		 2093 struct srp_host *host, *tmp_host;
2094 LIST_HEAD(target_list);
2095 struct srp_target_port *target, *tmp_target;
aef9ec39 2096
f5358a17 2097 srp_dev = ib_get_client_data(device, &srp_client);
aef9ec39 2098
f5358a17 2099 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2100 device_unregister(&host->dev);
aef9ec39
RD		 2101 /*
2102 * Wait for the sysfs entry to go away, so that no new
2103 * target ports can be created.
2104 */
2105 wait_for_completion(&host->released);
2106
2107 /*
2108 * Mark all target ports as removed, so we stop queueing
2109 * commands and don't try to reconnect.
2110 */
b3589fd4 2111 spin_lock(&host->target_lock);
549c5fc2 2112 list_for_each_entry(target, &host->target_list, list) {
0c5b3952
IR		 2113 spin_lock_irq(target->scsi_host->host_lock);
2114 target->state = SRP_TARGET_REMOVED;
2115 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39 2116 }
b3589fd4 2117 spin_unlock(&host->target_lock);
aef9ec39
RD		 2118
2119 /*
2120 * Wait for any reconnection tasks that may have
2121 * started before we marked our target ports as
2122 * removed, and any target port removal tasks.
2123 */
2124 flush_scheduled_work();
2125
2126 list_for_each_entry_safe(target, tmp_target,
2127 &host->target_list, list) {
b0e47c8b 2128 srp_remove_host(target->scsi_host);
ad696989 2129 scsi_remove_host(target->scsi_host);
aef9ec39
RD		 2130 srp_disconnect_target(target);
2131 ib_destroy_cm_id(target->cm_id);
2132 srp_free_target_ib(target);
2133 scsi_host_put(target->scsi_host);
2134 }
2135
aef9ec39
RD		 2136 kfree(host);
2137 }
2138
f5358a17
RD		 2139 if (srp_dev->fmr_pool)
2140 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2141 ib_dereg_mr(srp_dev->mr);
2142 ib_dealloc_pd(srp_dev->pd);
2143
2144 kfree(srp_dev);
aef9ec39
RD		 2145}
2146
3236822b
FT		 2147static struct srp_function_template ib_srp_transport_functions = {
2148};
2149
aef9ec39
RD		 2150static int __init srp_init_module(void)
2151{
2152 int ret;
2153
1e89a194
DD		 2154 if (srp_sg_tablesize > 255) {
2155 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2156 srp_sg_tablesize = 255;
2157 }
2158
3236822b
FT		 2159 ib_srp_transport_template =
2160 srp_attach_transport(&ib_srp_transport_functions);
2161 if (!ib_srp_transport_template)
2162 return -ENOMEM;
2163
74b0a15b
VP		 2164 srp_template.sg_tablesize = srp_sg_tablesize;
2165 srp_max_iu_len = (sizeof (struct srp_cmd) +
2166 sizeof (struct srp_indirect_buf) +
2167 srp_sg_tablesize * 16);
2168
aef9ec39
RD		 2169 ret = class_register(&srp_class);
2170 if (ret) {
2171 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
3236822b 2172 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2173 return ret;
2174 }
2175
c1a0b23b
MT		 2176 ib_sa_register_client(&srp_sa_client);
2177
aef9ec39
RD		 2178 ret = ib_register_client(&srp_client);
2179 if (ret) {
2180 printk(KERN_ERR PFX "couldn't register IB client\n");
3236822b 2181 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2182 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2183 class_unregister(&srp_class);
2184 return ret;
2185 }
2186
2187 return 0;
2188}
2189
2190static void __exit srp_cleanup_module(void)
2191{
2192 ib_unregister_client(&srp_client);
c1a0b23b 2193 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 2194 class_unregister(&srp_class);
3236822b 2195 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2196}
2197
2198module_init(srp_init_module);
2199module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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