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RDMA/ucma: Allow user space to set service type
[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.
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>
50
51#include <rdma/ib_cache.h>
52
53#include "ib_srp.h"
54
55#define DRV_NAME "ib_srp"
56#define PFX DRV_NAME ": "
57#define DRV_VERSION "0.2"
58#define DRV_RELDATE "November 1, 2005"
59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
74b0a15b
VP		 65static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
66static int srp_max_iu_len;
67
68module_param(srp_sg_tablesize, int, 0444);
69MODULE_PARM_DESC(srp_sg_tablesize,
70 "Max number of gather/scatter entries per I/O (default is 12)");
71
aef9ec39
RD		 72static int topspin_workarounds = 1;
73
74module_param(topspin_workarounds, int, 0444);
75MODULE_PARM_DESC(topspin_workarounds,
76 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
77
559ce8f1
IR		 78static int mellanox_workarounds = 1;
79
80module_param(mellanox_workarounds, int, 0444);
81MODULE_PARM_DESC(mellanox_workarounds,
82 "Enable workarounds for Mellanox SRP target bugs if != 0");
83
aef9ec39
RD		 84static void srp_add_one(struct ib_device *device);
85static void srp_remove_one(struct ib_device *device);
86static void srp_completion(struct ib_cq *cq, void *target_ptr);
87static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
88
89static struct ib_client srp_client = {
90 .name = "srp",
91 .add = srp_add_one,
92 .remove = srp_remove_one
93};
94
c1a0b23b
MT		 95static struct ib_sa_client srp_sa_client;
96
aef9ec39
RD		 97static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
98{
99 return (struct srp_target_port *) host->hostdata;
100}
101
102static const char *srp_target_info(struct Scsi_Host *host)
103{
104 return host_to_target(host)->target_name;
105}
106
5d7cbfd6
RD		 107static int srp_target_is_topspin(struct srp_target_port *target)
108{
109 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 110 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 111
112 return topspin_workarounds &&
3d1ff48d
RK		 113 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
114 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 115}
116
117static int srp_target_is_mellanox(struct srp_target_port *target)
118{
119 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
120
121 return mellanox_workarounds &&
122 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
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
85507bcc
RC		 139 iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction);
140 if (ib_dma_mapping_error(host->dev->dev, iu->dma))
aef9ec39
RD		 141 goto out_free_buf;
142
143 iu->size = size;
144 iu->direction = direction;
145
146 return iu;
147
148out_free_buf:
149 kfree(iu->buf);
150out_free_iu:
151 kfree(iu);
152out:
153 return NULL;
154}
155
156static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
157{
158 if (!iu)
159 return;
160
85507bcc 161 ib_dma_unmap_single(host->dev->dev, iu->dma, iu->size, iu->direction);
aef9ec39
RD		 162 kfree(iu->buf);
163 kfree(iu);
164}
165
166static void srp_qp_event(struct ib_event *event, void *context)
167{
168 printk(KERN_ERR PFX "QP event %d\n", event->event);
169}
170
171static int srp_init_qp(struct srp_target_port *target,
172 struct ib_qp *qp)
173{
174 struct ib_qp_attr *attr;
175 int ret;
176
177 attr = kmalloc(sizeof *attr, GFP_KERNEL);
178 if (!attr)
179 return -ENOMEM;
180
f5358a17 181 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
aef9ec39
RD		 182 target->srp_host->port,
183 be16_to_cpu(target->path.pkey),
184 &attr->pkey_index);
185 if (ret)
186 goto out;
187
188 attr->qp_state = IB_QPS_INIT;
189 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
190 IB_ACCESS_REMOTE_WRITE);
191 attr->port_num = target->srp_host->port;
192
193 ret = ib_modify_qp(qp, attr,
194 IB_QP_STATE |
195 IB_QP_PKEY_INDEX |
196 IB_QP_ACCESS_FLAGS |
197 IB_QP_PORT);
198
199out:
200 kfree(attr);
201 return ret;
202}
203
204static int srp_create_target_ib(struct srp_target_port *target)
205{
206 struct ib_qp_init_attr *init_attr;
207 int ret;
208
209 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
210 if (!init_attr)
211 return -ENOMEM;
212
f5358a17 213 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
f4fd0b22 214 NULL, target, SRP_CQ_SIZE, 0);
aef9ec39
RD		 215 if (IS_ERR(target->cq)) {
216 ret = PTR_ERR(target->cq);
217 goto out;
218 }
219
220 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
221
222 init_attr->event_handler = srp_qp_event;
223 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
224 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
225 init_attr->cap.max_recv_sge = 1;
226 init_attr->cap.max_send_sge = 1;
227 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
228 init_attr->qp_type = IB_QPT_RC;
229 init_attr->send_cq = target->cq;
230 init_attr->recv_cq = target->cq;
231
f5358a17 232 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
aef9ec39
RD		 233 if (IS_ERR(target->qp)) {
234 ret = PTR_ERR(target->qp);
235 ib_destroy_cq(target->cq);
236 goto out;
237 }
238
239 ret = srp_init_qp(target, target->qp);
240 if (ret) {
241 ib_destroy_qp(target->qp);
242 ib_destroy_cq(target->cq);
243 goto out;
244 }
245
246out:
247 kfree(init_attr);
248 return ret;
249}
250
251static void srp_free_target_ib(struct srp_target_port *target)
252{
253 int i;
254
255 ib_destroy_qp(target->qp);
256 ib_destroy_cq(target->cq);
257
258 for (i = 0; i < SRP_RQ_SIZE; ++i)
259 srp_free_iu(target->srp_host, target->rx_ring[i]);
260 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
261 srp_free_iu(target->srp_host, target->tx_ring[i]);
262}
263
264static void srp_path_rec_completion(int status,
265 struct ib_sa_path_rec *pathrec,
266 void *target_ptr)
267{
268 struct srp_target_port *target = target_ptr;
269
270 target->status = status;
271 if (status)
272 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
273 else
274 target->path = *pathrec;
275 complete(&target->done);
276}
277
278static int srp_lookup_path(struct srp_target_port *target)
279{
280 target->path.numb_path = 1;
281
282 init_completion(&target->done);
283
c1a0b23b
MT		 284 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
285 target->srp_host->dev->dev,
aef9ec39
RD		 286 target->srp_host->port,
287 &target->path,
288 IB_SA_PATH_REC_DGID |
289 IB_SA_PATH_REC_SGID |
290 IB_SA_PATH_REC_NUMB_PATH |
291 IB_SA_PATH_REC_PKEY,
292 SRP_PATH_REC_TIMEOUT_MS,
293 GFP_KERNEL,
294 srp_path_rec_completion,
295 target, &target->path_query);
296 if (target->path_query_id < 0)
297 return target->path_query_id;
298
299 wait_for_completion(&target->done);
300
301 if (target->status < 0)
302 printk(KERN_WARNING PFX "Path record query failed\n");
303
304 return target->status;
305}
306
307static int srp_send_req(struct srp_target_port *target)
308{
309 struct {
310 struct ib_cm_req_param param;
311 struct srp_login_req priv;
312 } *req = NULL;
313 int status;
314
315 req = kzalloc(sizeof *req, GFP_KERNEL);
316 if (!req)
317 return -ENOMEM;
318
319 req->param.primary_path = &target->path;
320 req->param.alternate_path = NULL;
321 req->param.service_id = target->service_id;
322 req->param.qp_num = target->qp->qp_num;
323 req->param.qp_type = target->qp->qp_type;
324 req->param.private_data = &req->priv;
325 req->param.private_data_len = sizeof req->priv;
326 req->param.flow_control = 1;
327
328 get_random_bytes(&req->param.starting_psn, 4);
329 req->param.starting_psn &= 0xffffff;
330
331 /*
332 * Pick some arbitrary defaults here; we could make these
333 * module parameters if anyone cared about setting them.
334 */
335 req->param.responder_resources = 4;
336 req->param.remote_cm_response_timeout = 20;
337 req->param.local_cm_response_timeout = 20;
338 req->param.retry_count = 7;
339 req->param.rnr_retry_count = 7;
340 req->param.max_cm_retries = 15;
341
342 req->priv.opcode = SRP_LOGIN_REQ;
343 req->priv.tag = 0;
74b0a15b 344 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
aef9ec39
RD		 345 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
346 SRP_BUF_FORMAT_INDIRECT);
0c0450db 347 /*
3cd96564 348 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 349 * port identifier format is 8 bytes of ID extension followed
350 * by 8 bytes of GUID. Older drafts put the two halves in the
351 * opposite order, so that the GUID comes first.
352 *
353 * Targets conforming to these obsolete drafts can be
354 * recognized by the I/O Class they report.
355 */
356 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
357 memcpy(req->priv.initiator_port_id,
01cb9bcb 358 &target->path.sgid.global.interface_id, 8);
0c0450db 359 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 360 &target->initiator_ext, 8);
0c0450db
R		 361 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
362 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
363 } else {
364 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 365 &target->initiator_ext, 8);
366 memcpy(req->priv.initiator_port_id + 8,
367 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 368 memcpy(req->priv.target_port_id, &target->id_ext, 8);
369 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
370 }
371
aef9ec39
RD		 372 /*
373 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 374 * zero out the first 8 bytes of our initiator port ID and set
375 * the second 8 bytes to the local node GUID.
aef9ec39 376 */
5d7cbfd6 377 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 378 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
379 "activated for target GUID %016llx\n",
380 (unsigned long long) be64_to_cpu(target->ioc_guid));
381 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb
IR		 382 memcpy(req->priv.initiator_port_id + 8,
383 &target->srp_host->dev->dev->node_guid, 8);
aef9ec39 384 }
aef9ec39
RD		 385
386 status = ib_send_cm_req(target->cm_id, &req->param);
387
388 kfree(req);
389
390 return status;
391}
392
393static void srp_disconnect_target(struct srp_target_port *target)
394{
395 /* XXX should send SRP_I_LOGOUT request */
396
397 init_completion(&target->done);
e6581056
RD		 398 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
399 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
400 return;
401 }
aef9ec39
RD		 402 wait_for_completion(&target->done);
403}
404
c4028958 405static void srp_remove_work(struct work_struct *work)
aef9ec39 406{
c4028958
DH		 407 struct srp_target_port *target =
408 container_of(work, struct srp_target_port, work);
aef9ec39
RD		 409
410 spin_lock_irq(target->scsi_host->host_lock);
411 if (target->state != SRP_TARGET_DEAD) {
412 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 413 return;
414 }
415 target->state = SRP_TARGET_REMOVED;
416 spin_unlock_irq(target->scsi_host->host_lock);
417
b3589fd4 418 spin_lock(&target->srp_host->target_lock);
aef9ec39 419 list_del(&target->list);
b3589fd4 420 spin_unlock(&target->srp_host->target_lock);
aef9ec39
RD		 421
422 scsi_remove_host(target->scsi_host);
423 ib_destroy_cm_id(target->cm_id);
424 srp_free_target_ib(target);
425 scsi_host_put(target->scsi_host);
aef9ec39
RD		 426}
427
428static int srp_connect_target(struct srp_target_port *target)
429{
430 int ret;
431
432 ret = srp_lookup_path(target);
433 if (ret)
434 return ret;
435
436 while (1) {
437 init_completion(&target->done);
438 ret = srp_send_req(target);
439 if (ret)
440 return ret;
441 wait_for_completion(&target->done);
442
443 /*
444 * The CM event handling code will set status to
445 * SRP_PORT_REDIRECT if we get a port redirect REJ
446 * back, or SRP_DLID_REDIRECT if we get a lid/qp
447 * redirect REJ back.
448 */
449 switch (target->status) {
450 case 0:
451 return 0;
452
453 case SRP_PORT_REDIRECT:
454 ret = srp_lookup_path(target);
455 if (ret)
456 return ret;
457 break;
458
459 case SRP_DLID_REDIRECT:
460 break;
461
462 default:
463 return target->status;
464 }
465 }
466}
467
d945e1df
RD		 468static void srp_unmap_data(struct scsi_cmnd *scmnd,
469 struct srp_target_port *target,
470 struct srp_request *req)
471{
bb350d1d 472 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 473 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
474 scmnd->sc_data_direction != DMA_FROM_DEVICE))
475 return;
476
f5358a17
RD		 477 if (req->fmr) {
478 ib_fmr_pool_unmap(req->fmr);
479 req->fmr = NULL;
480 }
481
bb350d1d
FT		 482 ib_dma_unmap_sg(target->srp_host->dev->dev, scsi_sglist(scmnd),
483 scsi_sg_count(scmnd), scmnd->sc_data_direction);
d945e1df
RD		 484}
485
526b4caa
IR		 486static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
487{
488 srp_unmap_data(req->scmnd, target, req);
489 list_move_tail(&req->list, &target->free_reqs);
490}
491
492static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
493{
494 req->scmnd->result = DID_RESET << 16;
495 req->scmnd->scsi_done(req->scmnd);
496 srp_remove_req(target, req);
497}
498
aef9ec39
RD		 499static int srp_reconnect_target(struct srp_target_port *target)
500{
501 struct ib_cm_id *new_cm_id;
502 struct ib_qp_attr qp_attr;
526b4caa 503 struct srp_request *req, *tmp;
aef9ec39
RD		 504 struct ib_wc wc;
505 int ret;
aef9ec39
RD		 506
507 spin_lock_irq(target->scsi_host->host_lock);
508 if (target->state != SRP_TARGET_LIVE) {
509 spin_unlock_irq(target->scsi_host->host_lock);
510 return -EAGAIN;
511 }
512 target->state = SRP_TARGET_CONNECTING;
513 spin_unlock_irq(target->scsi_host->host_lock);
514
515 srp_disconnect_target(target);
516 /*
517 * Now get a new local CM ID so that we avoid confusing the
518 * target in case things are really fouled up.
519 */
f5358a17 520 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
aef9ec39
RD		 521 srp_cm_handler, target);
522 if (IS_ERR(new_cm_id)) {
523 ret = PTR_ERR(new_cm_id);
524 goto err;
525 }
526 ib_destroy_cm_id(target->cm_id);
527 target->cm_id = new_cm_id;
528
529 qp_attr.qp_state = IB_QPS_RESET;
530 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
531 if (ret)
532 goto err;
533
534 ret = srp_init_qp(target, target->qp);
535 if (ret)
536 goto err;
537
538 while (ib_poll_cq(target->cq, 1, &wc) > 0)
539 ; /* nothing */
540
d916a8f1 541 spin_lock_irq(target->scsi_host->host_lock);
526b4caa
IR		 542 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
543 srp_reset_req(target, req);
d916a8f1 544 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 545
546 target->rx_head = 0;
547 target->tx_head = 0;
548 target->tx_tail = 0;
aef9ec39 549
1033ff67 550 target->qp_in_error = 0;
aef9ec39
RD		 551 ret = srp_connect_target(target);
552 if (ret)
553 goto err;
554
555 spin_lock_irq(target->scsi_host->host_lock);
556 if (target->state == SRP_TARGET_CONNECTING) {
557 ret = 0;
558 target->state = SRP_TARGET_LIVE;
559 } else
560 ret = -EAGAIN;
561 spin_unlock_irq(target->scsi_host->host_lock);
562
563 return ret;
564
565err:
566 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
567
568 /*
569 * We couldn't reconnect, so kill our target port off.
570 * However, we have to defer the real removal because we might
571 * be in the context of the SCSI error handler now, which
572 * would deadlock if we call scsi_remove_host().
573 */
574 spin_lock_irq(target->scsi_host->host_lock);
575 if (target->state == SRP_TARGET_CONNECTING) {
576 target->state = SRP_TARGET_DEAD;
c4028958 577 INIT_WORK(&target->work, srp_remove_work);
aef9ec39
RD		 578 schedule_work(&target->work);
579 }
580 spin_unlock_irq(target->scsi_host->host_lock);
581
582 return ret;
583}
584
559ce8f1 585static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
f5358a17
RD		 586 int sg_cnt, struct srp_request *req,
587 struct srp_direct_buf *buf)
588{
589 u64 io_addr = 0;
590 u64 *dma_pages;
591 u32 len;
592 int page_cnt;
593 int i, j;
594 int ret;
559ce8f1 595 struct srp_device *dev = target->srp_host->dev;
85507bcc 596 struct ib_device *ibdev = dev->dev;
bb350d1d 597 struct scatterlist *sg;
f5358a17
RD		 598
599 if (!dev->fmr_pool)
600 return -ENODEV;
601
5d7cbfd6
RD		 602 if (srp_target_is_mellanox(target) &&
603 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
559ce8f1
IR		 604 return -EINVAL;
605
f5358a17 606 len = page_cnt = 0;
bb350d1d
FT		 607 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
608 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 609
bb350d1d 610 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
f5358a17
RD		 611 if (i > 0)
612 return -EINVAL;
613 else
614 ++page_cnt;
615 }
bb350d1d 616 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
f5358a17
RD		 617 ~dev->fmr_page_mask) {
618 if (i < sg_cnt - 1)
619 return -EINVAL;
620 else
621 ++page_cnt;
622 }
623
85507bcc 624 len += dma_len;
f5358a17
RD		 625 }
626
627 page_cnt += len >> dev->fmr_page_shift;
628 if (page_cnt > SRP_FMR_SIZE)
629 return -ENOMEM;
630
631 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
632 if (!dma_pages)
633 return -ENOMEM;
634
635 page_cnt = 0;
bb350d1d
FT		 636 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
637 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc
RC		 638
639 for (j = 0; j < dma_len; j += dev->fmr_page_size)
f5358a17 640 dma_pages[page_cnt++] =
bb350d1d 641 (ib_sg_dma_address(ibdev, sg) &
85507bcc
RC		 642 dev->fmr_page_mask) + j;
643 }
f5358a17
RD		 644
645 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
adfaa888 646 dma_pages, page_cnt, io_addr);
f5358a17
RD		 647 if (IS_ERR(req->fmr)) {
648 ret = PTR_ERR(req->fmr);
6583eb3d 649 req->fmr = NULL;
f5358a17
RD		 650 goto out;
651 }
652
85507bcc
RC		 653 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
654 ~dev->fmr_page_mask);
f5358a17
RD		 655 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
656 buf->len = cpu_to_be32(len);
657
658 ret = 0;
659
660out:
661 kfree(dma_pages);
662
663 return ret;
664}
665
aef9ec39
RD		 666static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
667 struct srp_request *req)
668{
cf368713 669 struct scatterlist *scat;
aef9ec39 670 struct srp_cmd *cmd = req->cmd->buf;
cf368713 671 int len, nents, count;
f5358a17 672 u8 fmt = SRP_DATA_DESC_DIRECT;
85507bcc
RC		 673 struct srp_device *dev;
674 struct ib_device *ibdev;
aef9ec39 675
bb350d1d 676 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 677 return sizeof (struct srp_cmd);
678
679 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
680 scmnd->sc_data_direction != DMA_TO_DEVICE) {
681 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
682 scmnd->sc_data_direction);
683 return -EINVAL;
684 }
685
bb350d1d
FT		 686 nents = scsi_sg_count(scmnd);
687 scat = scsi_sglist(scmnd);
aef9ec39 688
85507bcc
RC		 689 dev = target->srp_host->dev;
690 ibdev = dev->dev;
691
692 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
f5358a17
RD		 693
694 fmt = SRP_DATA_DESC_DIRECT;
695 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 696
cf368713 697 if (count == 1) {
f5358a17
RD		 698 /*
699 * The midlayer only generated a single gather/scatter
700 * entry, or DMA mapping coalesced everything to a
701 * single entry. So a direct descriptor along with
702 * the DMA MR suffices.
703 */
cf368713 704 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 705
85507bcc
RC		 706 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
707 buf->key = cpu_to_be32(dev->mr->rkey);
708 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
559ce8f1 709 } else if (srp_map_fmr(target, scat, count, req,
f5358a17
RD		 710 (void *) cmd->add_data)) {
711 /*
712 * FMR mapping failed, and the scatterlist has more
713 * than one entry. Generate an indirect memory
714 * descriptor.
715 */
cf368713 716 struct srp_indirect_buf *buf = (void *) cmd->add_data;
bb350d1d 717 struct scatterlist *sg;
cf368713 718 u32 datalen = 0;
f5358a17 719 int i;
aef9ec39 720
cf368713 721 fmt = SRP_DATA_DESC_INDIRECT;
f5358a17
RD		 722 len = sizeof (struct srp_cmd) +
723 sizeof (struct srp_indirect_buf) +
724 count * sizeof (struct srp_direct_buf);
725
bb350d1d
FT		 726 scsi_for_each_sg(scmnd, sg, count, i) {
727 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 728
f5358a17 729 buf->desc_list[i].va =
bb350d1d 730 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
f5358a17 731 buf->desc_list[i].key =
85507bcc
RC		 732 cpu_to_be32(dev->mr->rkey);
733 buf->desc_list[i].len = cpu_to_be32(dma_len);
734 datalen += dma_len;
f5358a17 735 }
aef9ec39 736
cf368713
RD		 737 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
738 cmd->data_out_desc_cnt = count;
739 else
740 cmd->data_in_desc_cnt = count;
741
f5358a17
RD		 742 buf->table_desc.va =
743 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
cf368713 744 buf->table_desc.key =
f5358a17 745 cpu_to_be32(target->srp_host->dev->mr->rkey);
cf368713
RD		 746 buf->table_desc.len =
747 cpu_to_be32(count * sizeof (struct srp_direct_buf));
748
cf368713 749 buf->len = cpu_to_be32(datalen);
aef9ec39
RD		 750 }
751
752 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
753 cmd->buf_fmt = fmt << 4;
754 else
755 cmd->buf_fmt = fmt;
756
aef9ec39
RD		 757 return len;
758}
759
aef9ec39
RD		 760static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
761{
762 struct srp_request *req;
763 struct scsi_cmnd *scmnd;
764 unsigned long flags;
765 s32 delta;
766
767 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
768
769 spin_lock_irqsave(target->scsi_host->host_lock, flags);
770
771 target->req_lim += delta;
772
773 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
774
775 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
776 if (be32_to_cpu(rsp->resp_data_len) < 4)
777 req->tsk_status = -1;
778 else
779 req->tsk_status = rsp->data[3];
780 complete(&req->done);
781 } else {
d945e1df 782 scmnd = req->scmnd;
aef9ec39
RD		 783 if (!scmnd)
784 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
785 (unsigned long long) rsp->tag);
786 scmnd->result = rsp->status;
787
788 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
789 memcpy(scmnd->sense_buffer, rsp->data +
790 be32_to_cpu(rsp->resp_data_len),
791 min_t(int, be32_to_cpu(rsp->sense_data_len),
792 SCSI_SENSE_BUFFERSIZE));
793 }
794
795 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 796 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 797 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 798 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 799
aef9ec39 800 if (!req->tsk_mgmt) {
aef9ec39
RD		 801 scmnd->host_scribble = (void *) -1L;
802 scmnd->scsi_done(scmnd);
803
d945e1df 804 srp_remove_req(target, req);
aef9ec39
RD		 805 } else
806 req->cmd_done = 1;
807 }
808
809 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
810}
811
aef9ec39
RD		 812static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
813{
85507bcc 814 struct ib_device *dev;
aef9ec39
RD		 815 struct srp_iu *iu;
816 u8 opcode;
817
818 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
819
85507bcc
RC		 820 dev = target->srp_host->dev->dev;
821 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
822 DMA_FROM_DEVICE);
aef9ec39
RD		 823
824 opcode = *(u8 *) iu->buf;
825
826 if (0) {
827 int i;
828
829 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
830
831 for (i = 0; i < wc->byte_len; ++i) {
832 if (i % 8 == 0)
833 printk(KERN_ERR " [%02x] ", i);
834 printk(" %02x", ((u8 *) iu->buf)[i]);
835 if ((i + 1) % 8 == 0)
836 printk("\n");
837 }
838
839 if (wc->byte_len % 8)
840 printk("\n");
841 }
842
843 switch (opcode) {
844 case SRP_RSP:
845 srp_process_rsp(target, iu->buf);
846 break;
847
848 case SRP_T_LOGOUT:
849 /* XXX Handle target logout */
850 printk(KERN_WARNING PFX "Got target logout request\n");
851 break;
852
853 default:
854 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
855 break;
856 }
857
85507bcc
RC		 858 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
859 DMA_FROM_DEVICE);
aef9ec39
RD		 860}
861
862static void srp_completion(struct ib_cq *cq, void *target_ptr)
863{
864 struct srp_target_port *target = target_ptr;
865 struct ib_wc wc;
aef9ec39
RD		 866
867 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
868 while (ib_poll_cq(cq, 1, &wc) > 0) {
869 if (wc.status) {
870 printk(KERN_ERR PFX "failed %s status %d\n",
871 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
872 wc.status);
1033ff67 873 target->qp_in_error = 1;
aef9ec39
RD		 874 break;
875 }
876
877 if (wc.wr_id & SRP_OP_RECV)
878 srp_handle_recv(target, &wc);
879 else
880 ++target->tx_tail;
881 }
882}
883
884static int __srp_post_recv(struct srp_target_port *target)
885{
886 struct srp_iu *iu;
887 struct ib_sge list;
888 struct ib_recv_wr wr, *bad_wr;
889 unsigned int next;
890 int ret;
891
892 next = target->rx_head & (SRP_RQ_SIZE - 1);
893 wr.wr_id = next | SRP_OP_RECV;
894 iu = target->rx_ring[next];
895
896 list.addr = iu->dma;
897 list.length = iu->size;
f5358a17 898 list.lkey = target->srp_host->dev->mr->lkey;
aef9ec39
RD		 899
900 wr.next = NULL;
901 wr.sg_list = &list;
902 wr.num_sge = 1;
903
904 ret = ib_post_recv(target->qp, &wr, &bad_wr);
905 if (!ret)
906 ++target->rx_head;
907
908 return ret;
909}
910
911static int srp_post_recv(struct srp_target_port *target)
912{
913 unsigned long flags;
914 int ret;
915
916 spin_lock_irqsave(target->scsi_host->host_lock, flags);
917 ret = __srp_post_recv(target);
918 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
919
920 return ret;
921}
922
923/*
924 * Must be called with target->scsi_host->host_lock held to protect
47f2bce9
RD		 925 * req_lim and tx_head. Lock cannot be dropped between call here and
926 * call to __srp_post_send().
aef9ec39
RD		 927 */
928static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
929{
930 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
931 return NULL;
932
6bfa24fa
RD		 933 if (unlikely(target->req_lim < 1))
934 ++target->zero_req_lim;
47f2bce9 935
aef9ec39
RD		 936 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
937}
938
939/*
940 * Must be called with target->scsi_host->host_lock held to protect
941 * req_lim and tx_head.
942 */
943static int __srp_post_send(struct srp_target_port *target,
944 struct srp_iu *iu, int len)
945{
946 struct ib_sge list;
947 struct ib_send_wr wr, *bad_wr;
948 int ret = 0;
949
aef9ec39
RD		 950 list.addr = iu->dma;
951 list.length = len;
f5358a17 952 list.lkey = target->srp_host->dev->mr->lkey;
aef9ec39
RD		 953
954 wr.next = NULL;
955 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
956 wr.sg_list = &list;
957 wr.num_sge = 1;
958 wr.opcode = IB_WR_SEND;
959 wr.send_flags = IB_SEND_SIGNALED;
960
961 ret = ib_post_send(target->qp, &wr, &bad_wr);
962
963 if (!ret) {
964 ++target->tx_head;
965 --target->req_lim;
966 }
967
968 return ret;
969}
970
971static int srp_queuecommand(struct scsi_cmnd *scmnd,
972 void (*done)(struct scsi_cmnd *))
973{
974 struct srp_target_port *target = host_to_target(scmnd->device->host);
975 struct srp_request *req;
976 struct srp_iu *iu;
977 struct srp_cmd *cmd;
85507bcc 978 struct ib_device *dev;
aef9ec39
RD		 979 int len;
980
981 if (target->state == SRP_TARGET_CONNECTING)
982 goto err;
983
984 if (target->state == SRP_TARGET_DEAD ||
985 target->state == SRP_TARGET_REMOVED) {
986 scmnd->result = DID_BAD_TARGET << 16;
987 done(scmnd);
988 return 0;
989 }
990
991 iu = __srp_get_tx_iu(target);
992 if (!iu)
993 goto err;
994
85507bcc
RC		 995 dev = target->srp_host->dev->dev;
996 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
997 DMA_TO_DEVICE);
aef9ec39 998
d945e1df 999 req = list_entry(target->free_reqs.next, struct srp_request, list);
aef9ec39
RD		 1000
1001 scmnd->scsi_done = done;
1002 scmnd->result = 0;
d945e1df 1003 scmnd->host_scribble = (void *) (long) req->index;
aef9ec39
RD		 1004
1005 cmd = iu->buf;
1006 memset(cmd, 0, sizeof *cmd);
1007
1008 cmd->opcode = SRP_CMD;
1009 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1010 cmd->tag = req->index;
aef9ec39
RD		 1011 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1012
aef9ec39
RD		 1013 req->scmnd = scmnd;
1014 req->cmd = iu;
1015 req->cmd_done = 0;
1016 req->tsk_mgmt = NULL;
1017
1018 len = srp_map_data(scmnd, target, req);
1019 if (len < 0) {
1020 printk(KERN_ERR PFX "Failed to map data\n");
1021 goto err;
1022 }
1023
1024 if (__srp_post_recv(target)) {
1025 printk(KERN_ERR PFX "Recv failed\n");
1026 goto err_unmap;
1027 }
1028
85507bcc
RC		 1029 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1030 DMA_TO_DEVICE);
aef9ec39
RD		 1031
1032 if (__srp_post_send(target, iu, len)) {
1033 printk(KERN_ERR PFX "Send failed\n");
1034 goto err_unmap;
1035 }
1036
d945e1df 1037 list_move_tail(&req->list, &target->req_queue);
aef9ec39
RD		 1038
1039 return 0;
1040
1041err_unmap:
1042 srp_unmap_data(scmnd, target, req);
1043
1044err:
1045 return SCSI_MLQUEUE_HOST_BUSY;
1046}
1047
1048static int srp_alloc_iu_bufs(struct srp_target_port *target)
1049{
1050 int i;
1051
1052 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1053 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1054 target->max_ti_iu_len,
1055 GFP_KERNEL, DMA_FROM_DEVICE);
1056 if (!target->rx_ring[i])
1057 goto err;
1058 }
1059
1060 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1061 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
74b0a15b 1062 srp_max_iu_len,
aef9ec39
RD		 1063 GFP_KERNEL, DMA_TO_DEVICE);
1064 if (!target->tx_ring[i])
1065 goto err;
1066 }
1067
1068 return 0;
1069
1070err:
1071 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1072 srp_free_iu(target->srp_host, target->rx_ring[i]);
1073 target->rx_ring[i] = NULL;
1074 }
1075
1076 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1077 srp_free_iu(target->srp_host, target->tx_ring[i]);
1078 target->tx_ring[i] = NULL;
1079 }
1080
1081 return -ENOMEM;
1082}
1083
1084static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1085 struct ib_cm_event *event,
1086 struct srp_target_port *target)
1087{
1088 struct ib_class_port_info *cpi;
1089 int opcode;
1090
1091 switch (event->param.rej_rcvd.reason) {
1092 case IB_CM_REJ_PORT_CM_REDIRECT:
1093 cpi = event->param.rej_rcvd.ari;
1094 target->path.dlid = cpi->redirect_lid;
1095 target->path.pkey = cpi->redirect_pkey;
1096 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1097 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1098
1099 target->status = target->path.dlid ?
1100 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1101 break;
1102
1103 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1104 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1105 /*
1106 * Topspin/Cisco SRP gateways incorrectly send
1107 * reject reason code 25 when they mean 24
1108 * (port redirect).
1109 */
1110 memcpy(target->path.dgid.raw,
1111 event->param.rej_rcvd.ari, 16);
1112
1113 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1114 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1115 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1116
1117 target->status = SRP_PORT_REDIRECT;
1118 } else {
1119 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1120 target->status = -ECONNRESET;
1121 }
1122 break;
1123
1124 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1125 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1126 target->status = -ECONNRESET;
1127 break;
1128
1129 case IB_CM_REJ_CONSUMER_DEFINED:
1130 opcode = *(u8 *) event->private_data;
1131 if (opcode == SRP_LOGIN_REJ) {
1132 struct srp_login_rej *rej = event->private_data;
1133 u32 reason = be32_to_cpu(rej->reason);
1134
1135 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1136 printk(KERN_WARNING PFX
1137 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1138 else
1139 printk(KERN_WARNING PFX
1140 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1141 } else
1142 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1143 " opcode 0x%02x\n", opcode);
1144 target->status = -ECONNRESET;
1145 break;
1146
1147 default:
1148 printk(KERN_WARNING " REJ reason 0x%x\n",
1149 event->param.rej_rcvd.reason);
1150 target->status = -ECONNRESET;
1151 }
1152}
1153
1154static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1155{
1156 struct srp_target_port *target = cm_id->context;
1157 struct ib_qp_attr *qp_attr = NULL;
1158 int attr_mask = 0;
1159 int comp = 0;
1160 int opcode = 0;
1161
1162 switch (event->event) {
1163 case IB_CM_REQ_ERROR:
1164 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1165 comp = 1;
1166 target->status = -ECONNRESET;
1167 break;
1168
1169 case IB_CM_REP_RECEIVED:
1170 comp = 1;
1171 opcode = *(u8 *) event->private_data;
1172
1173 if (opcode == SRP_LOGIN_RSP) {
1174 struct srp_login_rsp *rsp = event->private_data;
1175
1176 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1177 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1178
1179 target->scsi_host->can_queue = min(target->req_lim,
1180 target->scsi_host->can_queue);
1181 } else {
1182 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1183 target->status = -ECONNRESET;
1184 break;
1185 }
1186
d2fcea7d
VP		 1187 if (!target->rx_ring[0]) {
1188 target->status = srp_alloc_iu_bufs(target);
1189 if (target->status)
1190 break;
1191 }
aef9ec39
RD		 1192
1193 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1194 if (!qp_attr) {
1195 target->status = -ENOMEM;
1196 break;
1197 }
1198
1199 qp_attr->qp_state = IB_QPS_RTR;
1200 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1201 if (target->status)
1202 break;
1203
1204 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1205 if (target->status)
1206 break;
1207
1208 target->status = srp_post_recv(target);
1209 if (target->status)
1210 break;
1211
1212 qp_attr->qp_state = IB_QPS_RTS;
1213 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1214 if (target->status)
1215 break;
1216
1217 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1218 if (target->status)
1219 break;
1220
1221 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1222 if (target->status)
1223 break;
1224
1225 break;
1226
1227 case IB_CM_REJ_RECEIVED:
1228 printk(KERN_DEBUG PFX "REJ received\n");
1229 comp = 1;
1230
1231 srp_cm_rej_handler(cm_id, event, target);
1232 break;
1233
b7ac4ab4
IR		 1234 case IB_CM_DREQ_RECEIVED:
1235 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1236 if (ib_send_cm_drep(cm_id, NULL, 0))
1237 printk(KERN_ERR PFX "Sending CM DREP failed\n");
aef9ec39
RD		 1238 break;
1239
1240 case IB_CM_TIMEWAIT_EXIT:
1241 printk(KERN_ERR PFX "connection closed\n");
1242
1243 comp = 1;
1244 target->status = 0;
1245 break;
1246
b7ac4ab4
IR		 1247 case IB_CM_MRA_RECEIVED:
1248 case IB_CM_DREQ_ERROR:
1249 case IB_CM_DREP_RECEIVED:
1250 break;
1251
aef9ec39
RD		 1252 default:
1253 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1254 break;
1255 }
1256
1257 if (comp)
1258 complete(&target->done);
1259
1260 kfree(qp_attr);
1261
1262 return 0;
1263}
1264
d945e1df
RD		 1265static int srp_send_tsk_mgmt(struct srp_target_port *target,
1266 struct srp_request *req, u8 func)
aef9ec39 1267{
aef9ec39
RD		 1268 struct srp_iu *iu;
1269 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39
RD		 1270
1271 spin_lock_irq(target->scsi_host->host_lock);
1272
1285b3a0
RD		 1273 if (target->state == SRP_TARGET_DEAD ||
1274 target->state == SRP_TARGET_REMOVED) {
d945e1df 1275 req->scmnd->result = DID_BAD_TARGET << 16;
1285b3a0
RD		 1276 goto out;
1277 }
1278
aef9ec39
RD		 1279 init_completion(&req->done);
1280
1281 iu = __srp_get_tx_iu(target);
1282 if (!iu)
1283 goto out;
1284
1285 tsk_mgmt = iu->buf;
1286 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1287
1288 tsk_mgmt->opcode = SRP_TSK_MGMT;
d945e1df
RD		 1289 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1290 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
aef9ec39 1291 tsk_mgmt->tsk_mgmt_func = func;
d945e1df 1292 tsk_mgmt->task_tag = req->index;
aef9ec39
RD		 1293
1294 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1295 goto out;
1296
1297 req->tsk_mgmt = iu;
1298
1299 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df 1300
aef9ec39
RD		 1301 if (!wait_for_completion_timeout(&req->done,
1302 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1303 return -1;
aef9ec39 1304
d945e1df 1305 return 0;
aef9ec39
RD		 1306
1307out:
1308 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df
RD		 1309 return -1;
1310}
1311
1312static int srp_find_req(struct srp_target_port *target,
1313 struct scsi_cmnd *scmnd,
1314 struct srp_request **req)
1315{
1316 if (scmnd->host_scribble == (void *) -1L)
1317 return -1;
1318
1319 *req = &target->req_ring[(long) scmnd->host_scribble];
1320
1321 return 0;
aef9ec39
RD		 1322}
1323
1324static int srp_abort(struct scsi_cmnd *scmnd)
1325{
d945e1df
RD		 1326 struct srp_target_port *target = host_to_target(scmnd->device->host);
1327 struct srp_request *req;
1328 int ret = SUCCESS;
1329
aef9ec39
RD		 1330 printk(KERN_ERR "SRP abort called\n");
1331
1033ff67
IR		 1332 if (target->qp_in_error)
1333 return FAILED;
d945e1df
RD		 1334 if (srp_find_req(target, scmnd, &req))
1335 return FAILED;
1336 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1337 return FAILED;
1338
1339 spin_lock_irq(target->scsi_host->host_lock);
1340
1341 if (req->cmd_done) {
1342 srp_remove_req(target, req);
1343 scmnd->scsi_done(scmnd);
1344 } else if (!req->tsk_status) {
1345 srp_remove_req(target, req);
1346 scmnd->result = DID_ABORT << 16;
1347 } else
1348 ret = FAILED;
1349
1350 spin_unlock_irq(target->scsi_host->host_lock);
1351
1352 return ret;
aef9ec39
RD		 1353}
1354
1355static int srp_reset_device(struct scsi_cmnd *scmnd)
1356{
d945e1df
RD		 1357 struct srp_target_port *target = host_to_target(scmnd->device->host);
1358 struct srp_request *req, *tmp;
1359
aef9ec39
RD		 1360 printk(KERN_ERR "SRP reset_device called\n");
1361
1033ff67
IR		 1362 if (target->qp_in_error)
1363 return FAILED;
d945e1df
RD		 1364 if (srp_find_req(target, scmnd, &req))
1365 return FAILED;
1366 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1367 return FAILED;
1368 if (req->tsk_status)
1369 return FAILED;
1370
1371 spin_lock_irq(target->scsi_host->host_lock);
1372
1373 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
526b4caa
IR		 1374 if (req->scmnd->device == scmnd->device)
1375 srp_reset_req(target, req);
d945e1df
RD		 1376
1377 spin_unlock_irq(target->scsi_host->host_lock);
1378
1379 return SUCCESS;
aef9ec39
RD		 1380}
1381
1382static int srp_reset_host(struct scsi_cmnd *scmnd)
1383{
1384 struct srp_target_port *target = host_to_target(scmnd->device->host);
1385 int ret = FAILED;
1386
1387 printk(KERN_ERR PFX "SRP reset_host called\n");
1388
1389 if (!srp_reconnect_target(target))
1390 ret = SUCCESS;
1391
1392 return ret;
1393}
1394
6ecb0c84
RD		 1395static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1396{
1397 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1398
1399 if (target->state == SRP_TARGET_DEAD ||
1400 target->state == SRP_TARGET_REMOVED)
1401 return -ENODEV;
1402
1403 return sprintf(buf, "0x%016llx\n",
1404 (unsigned long long) be64_to_cpu(target->id_ext));
1405}
1406
1407static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1408{
1409 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1410
1411 if (target->state == SRP_TARGET_DEAD ||
1412 target->state == SRP_TARGET_REMOVED)
1413 return -ENODEV;
1414
1415 return sprintf(buf, "0x%016llx\n",
1416 (unsigned long long) be64_to_cpu(target->ioc_guid));
1417}
1418
1419static ssize_t show_service_id(struct class_device *cdev, char *buf)
1420{
1421 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1422
1423 if (target->state == SRP_TARGET_DEAD ||
1424 target->state == SRP_TARGET_REMOVED)
1425 return -ENODEV;
1426
1427 return sprintf(buf, "0x%016llx\n",
1428 (unsigned long long) be64_to_cpu(target->service_id));
1429}
1430
1431static ssize_t show_pkey(struct class_device *cdev, char *buf)
1432{
1433 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1434
1435 if (target->state == SRP_TARGET_DEAD ||
1436 target->state == SRP_TARGET_REMOVED)
1437 return -ENODEV;
1438
1439 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1440}
1441
1442static ssize_t show_dgid(struct class_device *cdev, char *buf)
1443{
1444 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1445
1446 if (target->state == SRP_TARGET_DEAD ||
1447 target->state == SRP_TARGET_REMOVED)
1448 return -ENODEV;
1449
1450 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1451 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1452 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1453 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1454 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1455 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1456 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1457 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1458 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1459}
1460
3633b3d0
IR		 1461static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
1462{
1463 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1464
1465 if (target->state == SRP_TARGET_DEAD ||
1466 target->state == SRP_TARGET_REMOVED)
1467 return -ENODEV;
1468
1469 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1470 be16_to_cpu(target->orig_dgid[0]),
1471 be16_to_cpu(target->orig_dgid[1]),
1472 be16_to_cpu(target->orig_dgid[2]),
1473 be16_to_cpu(target->orig_dgid[3]),
1474 be16_to_cpu(target->orig_dgid[4]),
1475 be16_to_cpu(target->orig_dgid[5]),
1476 be16_to_cpu(target->orig_dgid[6]),
1477 be16_to_cpu(target->orig_dgid[7]));
1478}
1479
6bfa24fa
RD		 1480static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1481{
1482 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1483
1484 if (target->state == SRP_TARGET_DEAD ||
1485 target->state == SRP_TARGET_REMOVED)
1486 return -ENODEV;
1487
1488 return sprintf(buf, "%d\n", target->zero_req_lim);
1489}
1490
ded7f1a1
IR		 1491static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1492{
1493 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1494
1495 return sprintf(buf, "%d\n", target->srp_host->port);
1496}
1497
1498static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1499{
1500 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1501
1502 return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1503}
1504
1505static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1506static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1507static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1508static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1509static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
3633b3d0 1510static CLASS_DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
ded7f1a1
IR		 1511static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1512static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1513static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
6ecb0c84
RD		 1514
1515static struct class_device_attribute *srp_host_attrs[] = {
1516 &class_device_attr_id_ext,
1517 &class_device_attr_ioc_guid,
1518 &class_device_attr_service_id,
1519 &class_device_attr_pkey,
1520 &class_device_attr_dgid,
3633b3d0 1521 &class_device_attr_orig_dgid,
6bfa24fa 1522 &class_device_attr_zero_req_lim,
ded7f1a1
IR		 1523 &class_device_attr_local_ib_port,
1524 &class_device_attr_local_ib_device,
6ecb0c84
RD		 1525 NULL
1526};
1527
aef9ec39
RD		 1528static struct scsi_host_template srp_template = {
1529 .module = THIS_MODULE,
b7f008fd
RD		 1530 .name = "InfiniBand SRP initiator",
1531 .proc_name = DRV_NAME,
aef9ec39
RD		 1532 .info = srp_target_info,
1533 .queuecommand = srp_queuecommand,
1534 .eh_abort_handler = srp_abort,
1535 .eh_device_reset_handler = srp_reset_device,
1536 .eh_host_reset_handler = srp_reset_host,
1537 .can_queue = SRP_SQ_SIZE,
1538 .this_id = -1,
aef9ec39 1539 .cmd_per_lun = SRP_SQ_SIZE,
6ecb0c84
RD		 1540 .use_clustering = ENABLE_CLUSTERING,
1541 .shost_attrs = srp_host_attrs
aef9ec39
RD		 1542};
1543
1544static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1545{
1546 sprintf(target->target_name, "SRP.T10:%016llX",
1547 (unsigned long long) be64_to_cpu(target->id_ext));
1548
f5358a17 1549 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
aef9ec39
RD		 1550 return -ENODEV;
1551
b3589fd4 1552 spin_lock(&host->target_lock);
aef9ec39 1553 list_add_tail(&target->list, &host->target_list);
b3589fd4 1554 spin_unlock(&host->target_lock);
aef9ec39
RD		 1555
1556 target->state = SRP_TARGET_LIVE;
1557
aef9ec39 1558 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 1559 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 1560
1561 return 0;
1562}
1563
1564static void srp_release_class_dev(struct class_device *class_dev)
1565{
1566 struct srp_host *host =
1567 container_of(class_dev, struct srp_host, class_dev);
1568
1569 complete(&host->released);
1570}
1571
1572static struct class srp_class = {
1573 .name = "infiniband_srp",
1574 .release = srp_release_class_dev
1575};
1576
1577/*
1578 * Target ports are added by writing
1579 *
1580 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1581 * pkey=<P_Key>,service_id=<service ID>
1582 *
1583 * to the add_target sysfs attribute.
1584 */
1585enum {
1586 SRP_OPT_ERR = 0,
1587 SRP_OPT_ID_EXT = 1 << 0,
1588 SRP_OPT_IOC_GUID = 1 << 1,
1589 SRP_OPT_DGID = 1 << 2,
1590 SRP_OPT_PKEY = 1 << 3,
1591 SRP_OPT_SERVICE_ID = 1 << 4,
1592 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 1593 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 1594 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 1595 SRP_OPT_INITIATOR_EXT = 1 << 8,
aef9ec39
RD		 1596 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1597 SRP_OPT_IOC_GUID |
1598 SRP_OPT_DGID |
1599 SRP_OPT_PKEY |
1600 SRP_OPT_SERVICE_ID),
1601};
1602
1603static match_table_t srp_opt_tokens = {
52fb2b50
VP		 1604 { SRP_OPT_ID_EXT, "id_ext=%s" },
1605 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1606 { SRP_OPT_DGID, "dgid=%s" },
1607 { SRP_OPT_PKEY, "pkey=%x" },
1608 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1609 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1610 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 1611 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 1612 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
52fb2b50 1613 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 1614};
1615
1616static int srp_parse_options(const char *buf, struct srp_target_port *target)
1617{
1618 char *options, *sep_opt;
1619 char *p;
1620 char dgid[3];
1621 substring_t args[MAX_OPT_ARGS];
1622 int opt_mask = 0;
1623 int token;
1624 int ret = -EINVAL;
1625 int i;
1626
1627 options = kstrdup(buf, GFP_KERNEL);
1628 if (!options)
1629 return -ENOMEM;
1630
1631 sep_opt = options;
1632 while ((p = strsep(&sep_opt, ",")) != NULL) {
1633 if (!*p)
1634 continue;
1635
1636 token = match_token(p, srp_opt_tokens, args);
1637 opt_mask |= token;
1638
1639 switch (token) {
1640 case SRP_OPT_ID_EXT:
1641 p = match_strdup(args);
a20f3a6d
IR		 1642 if (!p) {
1643 ret = -ENOMEM;
1644 goto out;
1645 }
aef9ec39
RD		 1646 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1647 kfree(p);
1648 break;
1649
1650 case SRP_OPT_IOC_GUID:
1651 p = match_strdup(args);
a20f3a6d
IR		 1652 if (!p) {
1653 ret = -ENOMEM;
1654 goto out;
1655 }
aef9ec39
RD		 1656 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1657 kfree(p);
1658 break;
1659
1660 case SRP_OPT_DGID:
1661 p = match_strdup(args);
a20f3a6d
IR		 1662 if (!p) {
1663 ret = -ENOMEM;
1664 goto out;
1665 }
aef9ec39
RD		 1666 if (strlen(p) != 32) {
1667 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
ce1823f0 1668 kfree(p);
aef9ec39
RD		 1669 goto out;
1670 }
1671
1672 for (i = 0; i < 16; ++i) {
1673 strlcpy(dgid, p + i * 2, 3);
1674 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1675 }
bf17c1c7 1676 kfree(p);
3633b3d0 1677 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 1678 break;
1679
1680 case SRP_OPT_PKEY:
1681 if (match_hex(args, &token)) {
1682 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1683 goto out;
1684 }
1685 target->path.pkey = cpu_to_be16(token);
1686 break;
1687
1688 case SRP_OPT_SERVICE_ID:
1689 p = match_strdup(args);
a20f3a6d
IR		 1690 if (!p) {
1691 ret = -ENOMEM;
1692 goto out;
1693 }
aef9ec39
RD		 1694 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1695 kfree(p);
1696 break;
1697
1698 case SRP_OPT_MAX_SECT:
1699 if (match_int(args, &token)) {
1700 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1701 goto out;
1702 }
1703 target->scsi_host->max_sectors = token;
1704 break;
1705
52fb2b50
VP		 1706 case SRP_OPT_MAX_CMD_PER_LUN:
1707 if (match_int(args, &token)) {
1708 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1709 goto out;
1710 }
1711 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1712 break;
1713
0c0450db
R		 1714 case SRP_OPT_IO_CLASS:
1715 if (match_hex(args, &token)) {
1716 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1717 goto out;
1718 }
1719 if (token != SRP_REV10_IB_IO_CLASS &&
1720 token != SRP_REV16A_IB_IO_CLASS) {
1721 printk(KERN_WARNING PFX "unknown IO class parameter value"
1722 " %x specified (use %x or %x).\n",
1723 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1724 goto out;
1725 }
1726 target->io_class = token;
1727 break;
1728
01cb9bcb
IR		 1729 case SRP_OPT_INITIATOR_EXT:
1730 p = match_strdup(args);
a20f3a6d
IR		 1731 if (!p) {
1732 ret = -ENOMEM;
1733 goto out;
1734 }
01cb9bcb
IR		 1735 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1736 kfree(p);
1737 break;
1738
aef9ec39
RD		 1739 default:
1740 printk(KERN_WARNING PFX "unknown parameter or missing value "
1741 "'%s' in target creation request\n", p);
1742 goto out;
1743 }
1744 }
1745
1746 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1747 ret = 0;
1748 else
1749 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1750 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1751 !(srp_opt_tokens[i].token & opt_mask))
1752 printk(KERN_WARNING PFX "target creation request is "
1753 "missing parameter '%s'\n",
1754 srp_opt_tokens[i].pattern);
1755
1756out:
1757 kfree(options);
1758 return ret;
1759}
1760
1761static ssize_t srp_create_target(struct class_device *class_dev,
1762 const char *buf, size_t count)
1763{
1764 struct srp_host *host =
1765 container_of(class_dev, struct srp_host, class_dev);
1766 struct Scsi_Host *target_host;
1767 struct srp_target_port *target;
1768 int ret;
1769 int i;
1770
1771 target_host = scsi_host_alloc(&srp_template,
1772 sizeof (struct srp_target_port));
1773 if (!target_host)
1774 return -ENOMEM;
1775
3c8edf0e
AR		 1776 target_host->max_lun = SRP_MAX_LUN;
1777 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 1778
aef9ec39 1779 target = host_to_target(target_host);
aef9ec39 1780
0c0450db 1781 target->io_class = SRP_REV16A_IB_IO_CLASS;
aef9ec39
RD		 1782 target->scsi_host = target_host;
1783 target->srp_host = host;
1784
d945e1df 1785 INIT_LIST_HEAD(&target->free_reqs);
aef9ec39 1786 INIT_LIST_HEAD(&target->req_queue);
d945e1df
RD		 1787 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1788 target->req_ring[i].index = i;
1789 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1790 }
aef9ec39
RD		 1791
1792 ret = srp_parse_options(buf, target);
1793 if (ret)
1794 goto err;
1795
f5358a17 1796 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
aef9ec39
RD		 1797
1798 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1799 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1800 (unsigned long long) be64_to_cpu(target->id_ext),
1801 (unsigned long long) be64_to_cpu(target->ioc_guid),
1802 be16_to_cpu(target->path.pkey),
1803 (unsigned long long) be64_to_cpu(target->service_id),
1804 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1805 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1806 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1807 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1808 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1809 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1810 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1811 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1812
1813 ret = srp_create_target_ib(target);
1814 if (ret)
1815 goto err;
1816
f5358a17 1817 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
aef9ec39
RD		 1818 if (IS_ERR(target->cm_id)) {
1819 ret = PTR_ERR(target->cm_id);
1820 goto err_free;
1821 }
1822
1033ff67 1823 target->qp_in_error = 0;
aef9ec39
RD		 1824 ret = srp_connect_target(target);
1825 if (ret) {
1826 printk(KERN_ERR PFX "Connection failed\n");
1827 goto err_cm_id;
1828 }
1829
1830 ret = srp_add_target(host, target);
1831 if (ret)
1832 goto err_disconnect;
1833
1834 return count;
1835
1836err_disconnect:
1837 srp_disconnect_target(target);
1838
1839err_cm_id:
1840 ib_destroy_cm_id(target->cm_id);
1841
1842err_free:
1843 srp_free_target_ib(target);
1844
1845err:
1846 scsi_host_put(target_host);
1847
1848 return ret;
1849}
1850
1851static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1852
1853static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1854{
1855 struct srp_host *host =
1856 container_of(class_dev, struct srp_host, class_dev);
1857
f5358a17 1858 return sprintf(buf, "%s\n", host->dev->dev->name);
aef9ec39
RD		 1859}
1860
1861static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1862
1863static ssize_t show_port(struct class_device *class_dev, char *buf)
1864{
1865 struct srp_host *host =
1866 container_of(class_dev, struct srp_host, class_dev);
1867
1868 return sprintf(buf, "%d\n", host->port);
1869}
1870
1871static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1872
f5358a17 1873static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 1874{
1875 struct srp_host *host;
1876
1877 host = kzalloc(sizeof *host, GFP_KERNEL);
1878 if (!host)
1879 return NULL;
1880
1881 INIT_LIST_HEAD(&host->target_list);
b3589fd4 1882 spin_lock_init(&host->target_lock);
aef9ec39
RD		 1883 init_completion(&host->released);
1884 host->dev = device;
1885 host->port = port;
1886
aef9ec39 1887 host->class_dev.class = &srp_class;
f5358a17 1888 host->class_dev.dev = device->dev->dma_device;
aef9ec39 1889 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
f5358a17 1890 device->dev->name, port);
aef9ec39
RD		 1891
1892 if (class_device_register(&host->class_dev))
f5358a17 1893 goto free_host;
aef9ec39
RD		 1894 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1895 goto err_class;
1896 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1897 goto err_class;
1898 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1899 goto err_class;
1900
1901 return host;
1902
1903err_class:
1904 class_device_unregister(&host->class_dev);
1905
f5358a17 1906free_host:
aef9ec39
RD		 1907 kfree(host);
1908
1909 return NULL;
1910}
1911
1912static void srp_add_one(struct ib_device *device)
1913{
f5358a17
RD		 1914 struct srp_device *srp_dev;
1915 struct ib_device_attr *dev_attr;
1916 struct ib_fmr_pool_param fmr_param;
aef9ec39 1917 struct srp_host *host;
aef9ec39
RD		 1918 int s, e, p;
1919
f5358a17
RD		 1920 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1921 if (!dev_attr)
cf311cd4 1922 return;
aef9ec39 1923
f5358a17
RD		 1924 if (ib_query_device(device, dev_attr)) {
1925 printk(KERN_WARNING PFX "Query device failed for %s\n",
1926 device->name);
1927 goto free_attr;
1928 }
1929
1930 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1931 if (!srp_dev)
1932 goto free_attr;
1933
1934 /*
1935 * Use the smallest page size supported by the HCA, down to a
1936 * minimum of 512 bytes (which is the smallest sector that a
1937 * SCSI command will ever carry).
1938 */
1939 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1940 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
bf628dc2 1941 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
f5358a17
RD		 1942
1943 INIT_LIST_HEAD(&srp_dev->dev_list);
1944
1945 srp_dev->dev = device;
1946 srp_dev->pd = ib_alloc_pd(device);
1947 if (IS_ERR(srp_dev->pd))
1948 goto free_dev;
1949
1950 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1951 IB_ACCESS_LOCAL_WRITE |
1952 IB_ACCESS_REMOTE_READ |
1953 IB_ACCESS_REMOTE_WRITE);
1954 if (IS_ERR(srp_dev->mr))
1955 goto err_pd;
1956
1957 memset(&fmr_param, 0, sizeof fmr_param);
1958 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
1959 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
1960 fmr_param.cache = 1;
1961 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1962 fmr_param.page_shift = srp_dev->fmr_page_shift;
1963 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
1964 IB_ACCESS_REMOTE_WRITE |
1965 IB_ACCESS_REMOTE_READ);
1966
1967 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1968 if (IS_ERR(srp_dev->fmr_pool))
1969 srp_dev->fmr_pool = NULL;
aef9ec39 1970
07ebafba 1971 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 1972 s = 0;
1973 e = 0;
1974 } else {
1975 s = 1;
1976 e = device->phys_port_cnt;
1977 }
1978
1979 for (p = s; p <= e; ++p) {
f5358a17 1980 host = srp_add_port(srp_dev, p);
aef9ec39 1981 if (host)
f5358a17 1982 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 1983 }
1984
f5358a17
RD		 1985 ib_set_client_data(device, &srp_client, srp_dev);
1986
1987 goto free_attr;
1988
1989err_pd:
1990 ib_dealloc_pd(srp_dev->pd);
1991
1992free_dev:
1993 kfree(srp_dev);
1994
1995free_attr:
1996 kfree(dev_attr);
aef9ec39
RD		 1997}
1998
1999static void srp_remove_one(struct ib_device *device)
2000{
f5358a17 2001 struct srp_device *srp_dev;
aef9ec39
RD		 2002 struct srp_host *host, *tmp_host;
2003 LIST_HEAD(target_list);
2004 struct srp_target_port *target, *tmp_target;
aef9ec39 2005
f5358a17 2006 srp_dev = ib_get_client_data(device, &srp_client);
aef9ec39 2007
f5358a17 2008 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
aef9ec39
RD		 2009 class_device_unregister(&host->class_dev);
2010 /*
2011 * Wait for the sysfs entry to go away, so that no new
2012 * target ports can be created.
2013 */
2014 wait_for_completion(&host->released);
2015
2016 /*
2017 * Mark all target ports as removed, so we stop queueing
2018 * commands and don't try to reconnect.
2019 */
b3589fd4 2020 spin_lock(&host->target_lock);
549c5fc2 2021 list_for_each_entry(target, &host->target_list, list) {
0c5b3952
IR		 2022 spin_lock_irq(target->scsi_host->host_lock);
2023 target->state = SRP_TARGET_REMOVED;
2024 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39 2025 }
b3589fd4 2026 spin_unlock(&host->target_lock);
aef9ec39
RD		 2027
2028 /*
2029 * Wait for any reconnection tasks that may have
2030 * started before we marked our target ports as
2031 * removed, and any target port removal tasks.
2032 */
2033 flush_scheduled_work();
2034
2035 list_for_each_entry_safe(target, tmp_target,
2036 &host->target_list, list) {
2037 scsi_remove_host(target->scsi_host);
2038 srp_disconnect_target(target);
2039 ib_destroy_cm_id(target->cm_id);
2040 srp_free_target_ib(target);
2041 scsi_host_put(target->scsi_host);
2042 }
2043
aef9ec39
RD		 2044 kfree(host);
2045 }
2046
f5358a17
RD		 2047 if (srp_dev->fmr_pool)
2048 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2049 ib_dereg_mr(srp_dev->mr);
2050 ib_dealloc_pd(srp_dev->pd);
2051
2052 kfree(srp_dev);
aef9ec39
RD		 2053}
2054
2055static int __init srp_init_module(void)
2056{
2057 int ret;
2058
74b0a15b
VP		 2059 srp_template.sg_tablesize = srp_sg_tablesize;
2060 srp_max_iu_len = (sizeof (struct srp_cmd) +
2061 sizeof (struct srp_indirect_buf) +
2062 srp_sg_tablesize * 16);
2063
aef9ec39
RD		 2064 ret = class_register(&srp_class);
2065 if (ret) {
2066 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2067 return ret;
2068 }
2069
c1a0b23b
MT		 2070 ib_sa_register_client(&srp_sa_client);
2071
aef9ec39
RD		 2072 ret = ib_register_client(&srp_client);
2073 if (ret) {
2074 printk(KERN_ERR PFX "couldn't register IB client\n");
c1a0b23b 2075 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2076 class_unregister(&srp_class);
2077 return ret;
2078 }
2079
2080 return 0;
2081}
2082
2083static void __exit srp_cleanup_module(void)
2084{
2085 ib_unregister_client(&srp_client);
c1a0b23b 2086 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2087 class_unregister(&srp_class);
2088}
2089
2090module_init(srp_init_module);
2091module_exit(srp_cleanup_module);
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