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IPoIB/CM: Enable SRQ support on HCAs that support fewer than 16 SG entries
[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>
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,
71 "Max number of gather/scatter entries per I/O (default is 12)");
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
85507bcc
RC		 142 iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction);
143 if (ib_dma_mapping_error(host->dev->dev, iu->dma))
aef9ec39
RD		 144 goto out_free_buf;
145
146 iu->size = size;
147 iu->direction = direction;
148
149 return iu;
150
151out_free_buf:
152 kfree(iu->buf);
153out_free_iu:
154 kfree(iu);
155out:
156 return NULL;
157}
158
159static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
160{
161 if (!iu)
162 return;
163
85507bcc 164 ib_dma_unmap_single(host->dev->dev, iu->dma, iu->size, iu->direction);
aef9ec39
RD		 165 kfree(iu->buf);
166 kfree(iu);
167}
168
169static void srp_qp_event(struct ib_event *event, void *context)
170{
171 printk(KERN_ERR PFX "QP event %d\n", event->event);
172}
173
174static int srp_init_qp(struct srp_target_port *target,
175 struct ib_qp *qp)
176{
177 struct ib_qp_attr *attr;
178 int ret;
179
180 attr = kmalloc(sizeof *attr, GFP_KERNEL);
181 if (!attr)
182 return -ENOMEM;
183
f5358a17 184 ret = ib_find_cached_pkey(target->srp_host->dev->dev,
aef9ec39
RD		 185 target->srp_host->port,
186 be16_to_cpu(target->path.pkey),
187 &attr->pkey_index);
188 if (ret)
189 goto out;
190
191 attr->qp_state = IB_QPS_INIT;
192 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
193 IB_ACCESS_REMOTE_WRITE);
194 attr->port_num = target->srp_host->port;
195
196 ret = ib_modify_qp(qp, attr,
197 IB_QP_STATE |
198 IB_QP_PKEY_INDEX |
199 IB_QP_ACCESS_FLAGS |
200 IB_QP_PORT);
201
202out:
203 kfree(attr);
204 return ret;
205}
206
207static int srp_create_target_ib(struct srp_target_port *target)
208{
209 struct ib_qp_init_attr *init_attr;
210 int ret;
211
212 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
213 if (!init_attr)
214 return -ENOMEM;
215
f5358a17 216 target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
f4fd0b22 217 NULL, target, SRP_CQ_SIZE, 0);
aef9ec39
RD		 218 if (IS_ERR(target->cq)) {
219 ret = PTR_ERR(target->cq);
220 goto out;
221 }
222
223 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
224
225 init_attr->event_handler = srp_qp_event;
226 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
227 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
228 init_attr->cap.max_recv_sge = 1;
229 init_attr->cap.max_send_sge = 1;
230 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
231 init_attr->qp_type = IB_QPT_RC;
232 init_attr->send_cq = target->cq;
233 init_attr->recv_cq = target->cq;
234
f5358a17 235 target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
aef9ec39
RD		 236 if (IS_ERR(target->qp)) {
237 ret = PTR_ERR(target->qp);
238 ib_destroy_cq(target->cq);
239 goto out;
240 }
241
242 ret = srp_init_qp(target, target->qp);
243 if (ret) {
244 ib_destroy_qp(target->qp);
245 ib_destroy_cq(target->cq);
246 goto out;
247 }
248
249out:
250 kfree(init_attr);
251 return ret;
252}
253
254static void srp_free_target_ib(struct srp_target_port *target)
255{
256 int i;
257
258 ib_destroy_qp(target->qp);
259 ib_destroy_cq(target->cq);
260
261 for (i = 0; i < SRP_RQ_SIZE; ++i)
262 srp_free_iu(target->srp_host, target->rx_ring[i]);
263 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
264 srp_free_iu(target->srp_host, target->tx_ring[i]);
265}
266
267static void srp_path_rec_completion(int status,
268 struct ib_sa_path_rec *pathrec,
269 void *target_ptr)
270{
271 struct srp_target_port *target = target_ptr;
272
273 target->status = status;
274 if (status)
275 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
276 else
277 target->path = *pathrec;
278 complete(&target->done);
279}
280
281static int srp_lookup_path(struct srp_target_port *target)
282{
283 target->path.numb_path = 1;
284
285 init_completion(&target->done);
286
c1a0b23b
MT		 287 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
288 target->srp_host->dev->dev,
aef9ec39
RD		 289 target->srp_host->port,
290 &target->path,
247e020e 291 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 292 IB_SA_PATH_REC_DGID |
293 IB_SA_PATH_REC_SGID |
294 IB_SA_PATH_REC_NUMB_PATH |
295 IB_SA_PATH_REC_PKEY,
296 SRP_PATH_REC_TIMEOUT_MS,
297 GFP_KERNEL,
298 srp_path_rec_completion,
299 target, &target->path_query);
300 if (target->path_query_id < 0)
301 return target->path_query_id;
302
303 wait_for_completion(&target->done);
304
305 if (target->status < 0)
306 printk(KERN_WARNING PFX "Path record query failed\n");
307
308 return target->status;
309}
310
311static int srp_send_req(struct srp_target_port *target)
312{
313 struct {
314 struct ib_cm_req_param param;
315 struct srp_login_req priv;
316 } *req = NULL;
317 int status;
318
319 req = kzalloc(sizeof *req, GFP_KERNEL);
320 if (!req)
321 return -ENOMEM;
322
323 req->param.primary_path = &target->path;
324 req->param.alternate_path = NULL;
325 req->param.service_id = target->service_id;
326 req->param.qp_num = target->qp->qp_num;
327 req->param.qp_type = target->qp->qp_type;
328 req->param.private_data = &req->priv;
329 req->param.private_data_len = sizeof req->priv;
330 req->param.flow_control = 1;
331
332 get_random_bytes(&req->param.starting_psn, 4);
333 req->param.starting_psn &= 0xffffff;
334
335 /*
336 * Pick some arbitrary defaults here; we could make these
337 * module parameters if anyone cared about setting them.
338 */
339 req->param.responder_resources = 4;
340 req->param.remote_cm_response_timeout = 20;
341 req->param.local_cm_response_timeout = 20;
342 req->param.retry_count = 7;
343 req->param.rnr_retry_count = 7;
344 req->param.max_cm_retries = 15;
345
346 req->priv.opcode = SRP_LOGIN_REQ;
347 req->priv.tag = 0;
74b0a15b 348 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
aef9ec39
RD		 349 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
350 SRP_BUF_FORMAT_INDIRECT);
0c0450db 351 /*
3cd96564 352 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 353 * port identifier format is 8 bytes of ID extension followed
354 * by 8 bytes of GUID. Older drafts put the two halves in the
355 * opposite order, so that the GUID comes first.
356 *
357 * Targets conforming to these obsolete drafts can be
358 * recognized by the I/O Class they report.
359 */
360 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
361 memcpy(req->priv.initiator_port_id,
01cb9bcb 362 &target->path.sgid.global.interface_id, 8);
0c0450db 363 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 364 &target->initiator_ext, 8);
0c0450db
R		 365 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
366 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
367 } else {
368 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 369 &target->initiator_ext, 8);
370 memcpy(req->priv.initiator_port_id + 8,
371 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 372 memcpy(req->priv.target_port_id, &target->id_ext, 8);
373 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
374 }
375
aef9ec39
RD		 376 /*
377 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 378 * zero out the first 8 bytes of our initiator port ID and set
379 * the second 8 bytes to the local node GUID.
aef9ec39 380 */
5d7cbfd6 381 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 382 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
383 "activated for target GUID %016llx\n",
384 (unsigned long long) be64_to_cpu(target->ioc_guid));
385 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb
IR		 386 memcpy(req->priv.initiator_port_id + 8,
387 &target->srp_host->dev->dev->node_guid, 8);
aef9ec39 388 }
aef9ec39
RD		 389
390 status = ib_send_cm_req(target->cm_id, &req->param);
391
392 kfree(req);
393
394 return status;
395}
396
397static void srp_disconnect_target(struct srp_target_port *target)
398{
399 /* XXX should send SRP_I_LOGOUT request */
400
401 init_completion(&target->done);
e6581056
RD		 402 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
403 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
404 return;
405 }
aef9ec39
RD		 406 wait_for_completion(&target->done);
407}
408
c4028958 409static void srp_remove_work(struct work_struct *work)
aef9ec39 410{
c4028958
DH		 411 struct srp_target_port *target =
412 container_of(work, struct srp_target_port, work);
aef9ec39
RD		 413
414 spin_lock_irq(target->scsi_host->host_lock);
415 if (target->state != SRP_TARGET_DEAD) {
416 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 417 return;
418 }
419 target->state = SRP_TARGET_REMOVED;
420 spin_unlock_irq(target->scsi_host->host_lock);
421
b3589fd4 422 spin_lock(&target->srp_host->target_lock);
aef9ec39 423 list_del(&target->list);
b3589fd4 424 spin_unlock(&target->srp_host->target_lock);
aef9ec39 425
3236822b 426 srp_remove_host(target->scsi_host);
aef9ec39
RD		 427 scsi_remove_host(target->scsi_host);
428 ib_destroy_cm_id(target->cm_id);
429 srp_free_target_ib(target);
430 scsi_host_put(target->scsi_host);
aef9ec39
RD		 431}
432
433static int srp_connect_target(struct srp_target_port *target)
434{
435 int ret;
436
437 ret = srp_lookup_path(target);
438 if (ret)
439 return ret;
440
441 while (1) {
442 init_completion(&target->done);
443 ret = srp_send_req(target);
444 if (ret)
445 return ret;
446 wait_for_completion(&target->done);
447
448 /*
449 * The CM event handling code will set status to
450 * SRP_PORT_REDIRECT if we get a port redirect REJ
451 * back, or SRP_DLID_REDIRECT if we get a lid/qp
452 * redirect REJ back.
453 */
454 switch (target->status) {
455 case 0:
456 return 0;
457
458 case SRP_PORT_REDIRECT:
459 ret = srp_lookup_path(target);
460 if (ret)
461 return ret;
462 break;
463
464 case SRP_DLID_REDIRECT:
465 break;
466
467 default:
468 return target->status;
469 }
470 }
471}
472
d945e1df
RD		 473static void srp_unmap_data(struct scsi_cmnd *scmnd,
474 struct srp_target_port *target,
475 struct srp_request *req)
476{
bb350d1d 477 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 478 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
479 scmnd->sc_data_direction != DMA_FROM_DEVICE))
480 return;
481
f5358a17
RD		 482 if (req->fmr) {
483 ib_fmr_pool_unmap(req->fmr);
484 req->fmr = NULL;
485 }
486
bb350d1d
FT		 487 ib_dma_unmap_sg(target->srp_host->dev->dev, scsi_sglist(scmnd),
488 scsi_sg_count(scmnd), scmnd->sc_data_direction);
d945e1df
RD		 489}
490
526b4caa
IR		 491static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
492{
493 srp_unmap_data(req->scmnd, target, req);
494 list_move_tail(&req->list, &target->free_reqs);
495}
496
497static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
498{
499 req->scmnd->result = DID_RESET << 16;
500 req->scmnd->scsi_done(req->scmnd);
501 srp_remove_req(target, req);
502}
503
aef9ec39
RD		 504static int srp_reconnect_target(struct srp_target_port *target)
505{
506 struct ib_cm_id *new_cm_id;
507 struct ib_qp_attr qp_attr;
526b4caa 508 struct srp_request *req, *tmp;
aef9ec39
RD		 509 struct ib_wc wc;
510 int ret;
aef9ec39
RD		 511
512 spin_lock_irq(target->scsi_host->host_lock);
513 if (target->state != SRP_TARGET_LIVE) {
514 spin_unlock_irq(target->scsi_host->host_lock);
515 return -EAGAIN;
516 }
517 target->state = SRP_TARGET_CONNECTING;
518 spin_unlock_irq(target->scsi_host->host_lock);
519
520 srp_disconnect_target(target);
521 /*
522 * Now get a new local CM ID so that we avoid confusing the
523 * target in case things are really fouled up.
524 */
f5358a17 525 new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
aef9ec39
RD		 526 srp_cm_handler, target);
527 if (IS_ERR(new_cm_id)) {
528 ret = PTR_ERR(new_cm_id);
529 goto err;
530 }
531 ib_destroy_cm_id(target->cm_id);
532 target->cm_id = new_cm_id;
533
534 qp_attr.qp_state = IB_QPS_RESET;
535 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
536 if (ret)
537 goto err;
538
539 ret = srp_init_qp(target, target->qp);
540 if (ret)
541 goto err;
542
543 while (ib_poll_cq(target->cq, 1, &wc) > 0)
544 ; /* nothing */
545
d916a8f1 546 spin_lock_irq(target->scsi_host->host_lock);
526b4caa
IR		 547 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
548 srp_reset_req(target, req);
d916a8f1 549 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 550
551 target->rx_head = 0;
552 target->tx_head = 0;
553 target->tx_tail = 0;
aef9ec39 554
1033ff67 555 target->qp_in_error = 0;
aef9ec39
RD		 556 ret = srp_connect_target(target);
557 if (ret)
558 goto err;
559
560 spin_lock_irq(target->scsi_host->host_lock);
561 if (target->state == SRP_TARGET_CONNECTING) {
562 ret = 0;
563 target->state = SRP_TARGET_LIVE;
564 } else
565 ret = -EAGAIN;
566 spin_unlock_irq(target->scsi_host->host_lock);
567
568 return ret;
569
570err:
571 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
572
573 /*
574 * We couldn't reconnect, so kill our target port off.
575 * However, we have to defer the real removal because we might
576 * be in the context of the SCSI error handler now, which
577 * would deadlock if we call scsi_remove_host().
578 */
579 spin_lock_irq(target->scsi_host->host_lock);
580 if (target->state == SRP_TARGET_CONNECTING) {
581 target->state = SRP_TARGET_DEAD;
c4028958 582 INIT_WORK(&target->work, srp_remove_work);
aef9ec39
RD		 583 schedule_work(&target->work);
584 }
585 spin_unlock_irq(target->scsi_host->host_lock);
586
587 return ret;
588}
589
559ce8f1 590static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
f5358a17
RD		 591 int sg_cnt, struct srp_request *req,
592 struct srp_direct_buf *buf)
593{
594 u64 io_addr = 0;
595 u64 *dma_pages;
596 u32 len;
597 int page_cnt;
598 int i, j;
599 int ret;
559ce8f1 600 struct srp_device *dev = target->srp_host->dev;
85507bcc 601 struct ib_device *ibdev = dev->dev;
bb350d1d 602 struct scatterlist *sg;
f5358a17
RD		 603
604 if (!dev->fmr_pool)
605 return -ENODEV;
606
5d7cbfd6
RD		 607 if (srp_target_is_mellanox(target) &&
608 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
559ce8f1
IR		 609 return -EINVAL;
610
f5358a17 611 len = page_cnt = 0;
bb350d1d
FT		 612 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
613 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 614
bb350d1d 615 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
f5358a17
RD		 616 if (i > 0)
617 return -EINVAL;
618 else
619 ++page_cnt;
620 }
bb350d1d 621 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
f5358a17
RD		 622 ~dev->fmr_page_mask) {
623 if (i < sg_cnt - 1)
624 return -EINVAL;
625 else
626 ++page_cnt;
627 }
628
85507bcc 629 len += dma_len;
f5358a17
RD		 630 }
631
632 page_cnt += len >> dev->fmr_page_shift;
633 if (page_cnt > SRP_FMR_SIZE)
634 return -ENOMEM;
635
636 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
637 if (!dma_pages)
638 return -ENOMEM;
639
640 page_cnt = 0;
bb350d1d
FT		 641 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
642 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc
RC		 643
644 for (j = 0; j < dma_len; j += dev->fmr_page_size)
f5358a17 645 dma_pages[page_cnt++] =
bb350d1d 646 (ib_sg_dma_address(ibdev, sg) &
85507bcc
RC		 647 dev->fmr_page_mask) + j;
648 }
f5358a17
RD		 649
650 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
adfaa888 651 dma_pages, page_cnt, io_addr);
f5358a17
RD		 652 if (IS_ERR(req->fmr)) {
653 ret = PTR_ERR(req->fmr);
6583eb3d 654 req->fmr = NULL;
f5358a17
RD		 655 goto out;
656 }
657
85507bcc
RC		 658 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
659 ~dev->fmr_page_mask);
f5358a17
RD		 660 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
661 buf->len = cpu_to_be32(len);
662
663 ret = 0;
664
665out:
666 kfree(dma_pages);
667
668 return ret;
669}
670
aef9ec39
RD		 671static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
672 struct srp_request *req)
673{
cf368713 674 struct scatterlist *scat;
aef9ec39 675 struct srp_cmd *cmd = req->cmd->buf;
cf368713 676 int len, nents, count;
f5358a17 677 u8 fmt = SRP_DATA_DESC_DIRECT;
85507bcc
RC		 678 struct srp_device *dev;
679 struct ib_device *ibdev;
aef9ec39 680
bb350d1d 681 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 682 return sizeof (struct srp_cmd);
683
684 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
685 scmnd->sc_data_direction != DMA_TO_DEVICE) {
686 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
687 scmnd->sc_data_direction);
688 return -EINVAL;
689 }
690
bb350d1d
FT		 691 nents = scsi_sg_count(scmnd);
692 scat = scsi_sglist(scmnd);
aef9ec39 693
85507bcc
RC		 694 dev = target->srp_host->dev;
695 ibdev = dev->dev;
696
697 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
f5358a17
RD		 698
699 fmt = SRP_DATA_DESC_DIRECT;
700 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 701
cf368713 702 if (count == 1) {
f5358a17
RD		 703 /*
704 * The midlayer only generated a single gather/scatter
705 * entry, or DMA mapping coalesced everything to a
706 * single entry. So a direct descriptor along with
707 * the DMA MR suffices.
708 */
cf368713 709 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 710
85507bcc
RC		 711 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
712 buf->key = cpu_to_be32(dev->mr->rkey);
713 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
559ce8f1 714 } else if (srp_map_fmr(target, scat, count, req,
f5358a17
RD		 715 (void *) cmd->add_data)) {
716 /*
717 * FMR mapping failed, and the scatterlist has more
718 * than one entry. Generate an indirect memory
719 * descriptor.
720 */
cf368713 721 struct srp_indirect_buf *buf = (void *) cmd->add_data;
bb350d1d 722 struct scatterlist *sg;
cf368713 723 u32 datalen = 0;
f5358a17 724 int i;
aef9ec39 725
cf368713 726 fmt = SRP_DATA_DESC_INDIRECT;
f5358a17
RD		 727 len = sizeof (struct srp_cmd) +
728 sizeof (struct srp_indirect_buf) +
729 count * sizeof (struct srp_direct_buf);
730
bb350d1d
FT		 731 scsi_for_each_sg(scmnd, sg, count, i) {
732 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 733
f5358a17 734 buf->desc_list[i].va =
bb350d1d 735 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
f5358a17 736 buf->desc_list[i].key =
85507bcc
RC		 737 cpu_to_be32(dev->mr->rkey);
738 buf->desc_list[i].len = cpu_to_be32(dma_len);
739 datalen += dma_len;
f5358a17 740 }
aef9ec39 741
cf368713
RD		 742 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
743 cmd->data_out_desc_cnt = count;
744 else
745 cmd->data_in_desc_cnt = count;
746
f5358a17
RD		 747 buf->table_desc.va =
748 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
cf368713 749 buf->table_desc.key =
f5358a17 750 cpu_to_be32(target->srp_host->dev->mr->rkey);
cf368713
RD		 751 buf->table_desc.len =
752 cpu_to_be32(count * sizeof (struct srp_direct_buf));
753
cf368713 754 buf->len = cpu_to_be32(datalen);
aef9ec39
RD		 755 }
756
757 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
758 cmd->buf_fmt = fmt << 4;
759 else
760 cmd->buf_fmt = fmt;
761
aef9ec39
RD		 762 return len;
763}
764
aef9ec39
RD		 765static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
766{
767 struct srp_request *req;
768 struct scsi_cmnd *scmnd;
769 unsigned long flags;
770 s32 delta;
771
772 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
773
774 spin_lock_irqsave(target->scsi_host->host_lock, flags);
775
776 target->req_lim += delta;
777
778 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
779
780 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
781 if (be32_to_cpu(rsp->resp_data_len) < 4)
782 req->tsk_status = -1;
783 else
784 req->tsk_status = rsp->data[3];
785 complete(&req->done);
786 } else {
d945e1df 787 scmnd = req->scmnd;
aef9ec39
RD		 788 if (!scmnd)
789 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
790 (unsigned long long) rsp->tag);
791 scmnd->result = rsp->status;
792
793 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
794 memcpy(scmnd->sense_buffer, rsp->data +
795 be32_to_cpu(rsp->resp_data_len),
796 min_t(int, be32_to_cpu(rsp->sense_data_len),
797 SCSI_SENSE_BUFFERSIZE));
798 }
799
800 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 801 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 802 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 803 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 804
aef9ec39 805 if (!req->tsk_mgmt) {
aef9ec39
RD		 806 scmnd->host_scribble = (void *) -1L;
807 scmnd->scsi_done(scmnd);
808
d945e1df 809 srp_remove_req(target, req);
aef9ec39
RD		 810 } else
811 req->cmd_done = 1;
812 }
813
814 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
815}
816
aef9ec39
RD		 817static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
818{
85507bcc 819 struct ib_device *dev;
aef9ec39
RD		 820 struct srp_iu *iu;
821 u8 opcode;
822
823 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
824
85507bcc
RC		 825 dev = target->srp_host->dev->dev;
826 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
827 DMA_FROM_DEVICE);
aef9ec39
RD		 828
829 opcode = *(u8 *) iu->buf;
830
831 if (0) {
832 int i;
833
834 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
835
836 for (i = 0; i < wc->byte_len; ++i) {
837 if (i % 8 == 0)
838 printk(KERN_ERR " [%02x] ", i);
839 printk(" %02x", ((u8 *) iu->buf)[i]);
840 if ((i + 1) % 8 == 0)
841 printk("\n");
842 }
843
844 if (wc->byte_len % 8)
845 printk("\n");
846 }
847
848 switch (opcode) {
849 case SRP_RSP:
850 srp_process_rsp(target, iu->buf);
851 break;
852
853 case SRP_T_LOGOUT:
854 /* XXX Handle target logout */
855 printk(KERN_WARNING PFX "Got target logout request\n");
856 break;
857
858 default:
859 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
860 break;
861 }
862
85507bcc
RC		 863 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
864 DMA_FROM_DEVICE);
aef9ec39
RD		 865}
866
867static void srp_completion(struct ib_cq *cq, void *target_ptr)
868{
869 struct srp_target_port *target = target_ptr;
870 struct ib_wc wc;
aef9ec39
RD		 871
872 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
873 while (ib_poll_cq(cq, 1, &wc) > 0) {
874 if (wc.status) {
875 printk(KERN_ERR PFX "failed %s status %d\n",
876 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
877 wc.status);
1033ff67 878 target->qp_in_error = 1;
aef9ec39
RD		 879 break;
880 }
881
882 if (wc.wr_id & SRP_OP_RECV)
883 srp_handle_recv(target, &wc);
884 else
885 ++target->tx_tail;
886 }
887}
888
889static int __srp_post_recv(struct srp_target_port *target)
890{
891 struct srp_iu *iu;
892 struct ib_sge list;
893 struct ib_recv_wr wr, *bad_wr;
894 unsigned int next;
895 int ret;
896
897 next = target->rx_head & (SRP_RQ_SIZE - 1);
898 wr.wr_id = next | SRP_OP_RECV;
899 iu = target->rx_ring[next];
900
901 list.addr = iu->dma;
902 list.length = iu->size;
f5358a17 903 list.lkey = target->srp_host->dev->mr->lkey;
aef9ec39
RD		 904
905 wr.next = NULL;
906 wr.sg_list = &list;
907 wr.num_sge = 1;
908
909 ret = ib_post_recv(target->qp, &wr, &bad_wr);
910 if (!ret)
911 ++target->rx_head;
912
913 return ret;
914}
915
916static int srp_post_recv(struct srp_target_port *target)
917{
918 unsigned long flags;
919 int ret;
920
921 spin_lock_irqsave(target->scsi_host->host_lock, flags);
922 ret = __srp_post_recv(target);
923 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
924
925 return ret;
926}
927
928/*
929 * Must be called with target->scsi_host->host_lock held to protect
47f2bce9
RD		 930 * req_lim and tx_head. Lock cannot be dropped between call here and
931 * call to __srp_post_send().
aef9ec39 932 */
8cba2077
DD		 933static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
934 enum srp_request_type req_type)
aef9ec39 935{
8cba2077
DD		 936 s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
937
aef9ec39
RD		 938 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
939 return NULL;
940
8cba2077 941 if (target->req_lim < min) {
6bfa24fa 942 ++target->zero_req_lim;
8cba2077
DD		 943 return NULL;
944 }
47f2bce9 945
aef9ec39
RD		 946 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
947}
948
949/*
950 * Must be called with target->scsi_host->host_lock held to protect
951 * req_lim and tx_head.
952 */
953static int __srp_post_send(struct srp_target_port *target,
954 struct srp_iu *iu, int len)
955{
956 struct ib_sge list;
957 struct ib_send_wr wr, *bad_wr;
958 int ret = 0;
959
aef9ec39
RD		 960 list.addr = iu->dma;
961 list.length = len;
f5358a17 962 list.lkey = target->srp_host->dev->mr->lkey;
aef9ec39
RD		 963
964 wr.next = NULL;
965 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
966 wr.sg_list = &list;
967 wr.num_sge = 1;
968 wr.opcode = IB_WR_SEND;
969 wr.send_flags = IB_SEND_SIGNALED;
970
971 ret = ib_post_send(target->qp, &wr, &bad_wr);
972
973 if (!ret) {
974 ++target->tx_head;
975 --target->req_lim;
976 }
977
978 return ret;
979}
980
981static int srp_queuecommand(struct scsi_cmnd *scmnd,
982 void (*done)(struct scsi_cmnd *))
983{
984 struct srp_target_port *target = host_to_target(scmnd->device->host);
985 struct srp_request *req;
986 struct srp_iu *iu;
987 struct srp_cmd *cmd;
85507bcc 988 struct ib_device *dev;
aef9ec39
RD		 989 int len;
990
991 if (target->state == SRP_TARGET_CONNECTING)
992 goto err;
993
994 if (target->state == SRP_TARGET_DEAD ||
995 target->state == SRP_TARGET_REMOVED) {
996 scmnd->result = DID_BAD_TARGET << 16;
997 done(scmnd);
998 return 0;
999 }
1000
8cba2077 1001 iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
aef9ec39
RD		 1002 if (!iu)
1003 goto err;
1004
85507bcc
RC		 1005 dev = target->srp_host->dev->dev;
1006 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1007 DMA_TO_DEVICE);
aef9ec39 1008
d945e1df 1009 req = list_entry(target->free_reqs.next, struct srp_request, list);
aef9ec39
RD		 1010
1011 scmnd->scsi_done = done;
1012 scmnd->result = 0;
d945e1df 1013 scmnd->host_scribble = (void *) (long) req->index;
aef9ec39
RD		 1014
1015 cmd = iu->buf;
1016 memset(cmd, 0, sizeof *cmd);
1017
1018 cmd->opcode = SRP_CMD;
1019 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1020 cmd->tag = req->index;
aef9ec39
RD		 1021 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1022
aef9ec39
RD		 1023 req->scmnd = scmnd;
1024 req->cmd = iu;
1025 req->cmd_done = 0;
1026 req->tsk_mgmt = NULL;
1027
1028 len = srp_map_data(scmnd, target, req);
1029 if (len < 0) {
1030 printk(KERN_ERR PFX "Failed to map data\n");
1031 goto err;
1032 }
1033
1034 if (__srp_post_recv(target)) {
1035 printk(KERN_ERR PFX "Recv failed\n");
1036 goto err_unmap;
1037 }
1038
85507bcc
RC		 1039 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1040 DMA_TO_DEVICE);
aef9ec39
RD		 1041
1042 if (__srp_post_send(target, iu, len)) {
1043 printk(KERN_ERR PFX "Send failed\n");
1044 goto err_unmap;
1045 }
1046
d945e1df 1047 list_move_tail(&req->list, &target->req_queue);
aef9ec39
RD		 1048
1049 return 0;
1050
1051err_unmap:
1052 srp_unmap_data(scmnd, target, req);
1053
1054err:
1055 return SCSI_MLQUEUE_HOST_BUSY;
1056}
1057
1058static int srp_alloc_iu_bufs(struct srp_target_port *target)
1059{
1060 int i;
1061
1062 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1063 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1064 target->max_ti_iu_len,
1065 GFP_KERNEL, DMA_FROM_DEVICE);
1066 if (!target->rx_ring[i])
1067 goto err;
1068 }
1069
1070 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1071 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
74b0a15b 1072 srp_max_iu_len,
aef9ec39
RD		 1073 GFP_KERNEL, DMA_TO_DEVICE);
1074 if (!target->tx_ring[i])
1075 goto err;
1076 }
1077
1078 return 0;
1079
1080err:
1081 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1082 srp_free_iu(target->srp_host, target->rx_ring[i]);
1083 target->rx_ring[i] = NULL;
1084 }
1085
1086 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1087 srp_free_iu(target->srp_host, target->tx_ring[i]);
1088 target->tx_ring[i] = NULL;
1089 }
1090
1091 return -ENOMEM;
1092}
1093
1094static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1095 struct ib_cm_event *event,
1096 struct srp_target_port *target)
1097{
1098 struct ib_class_port_info *cpi;
1099 int opcode;
1100
1101 switch (event->param.rej_rcvd.reason) {
1102 case IB_CM_REJ_PORT_CM_REDIRECT:
1103 cpi = event->param.rej_rcvd.ari;
1104 target->path.dlid = cpi->redirect_lid;
1105 target->path.pkey = cpi->redirect_pkey;
1106 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1107 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1108
1109 target->status = target->path.dlid ?
1110 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1111 break;
1112
1113 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1114 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1115 /*
1116 * Topspin/Cisco SRP gateways incorrectly send
1117 * reject reason code 25 when they mean 24
1118 * (port redirect).
1119 */
1120 memcpy(target->path.dgid.raw,
1121 event->param.rej_rcvd.ari, 16);
1122
1123 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1124 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1125 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1126
1127 target->status = SRP_PORT_REDIRECT;
1128 } else {
1129 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1130 target->status = -ECONNRESET;
1131 }
1132 break;
1133
1134 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1135 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1136 target->status = -ECONNRESET;
1137 break;
1138
1139 case IB_CM_REJ_CONSUMER_DEFINED:
1140 opcode = *(u8 *) event->private_data;
1141 if (opcode == SRP_LOGIN_REJ) {
1142 struct srp_login_rej *rej = event->private_data;
1143 u32 reason = be32_to_cpu(rej->reason);
1144
1145 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1146 printk(KERN_WARNING PFX
1147 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1148 else
1149 printk(KERN_WARNING PFX
1150 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1151 } else
1152 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1153 " opcode 0x%02x\n", opcode);
1154 target->status = -ECONNRESET;
1155 break;
1156
1157 default:
1158 printk(KERN_WARNING " REJ reason 0x%x\n",
1159 event->param.rej_rcvd.reason);
1160 target->status = -ECONNRESET;
1161 }
1162}
1163
1164static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1165{
1166 struct srp_target_port *target = cm_id->context;
1167 struct ib_qp_attr *qp_attr = NULL;
1168 int attr_mask = 0;
1169 int comp = 0;
1170 int opcode = 0;
1171
1172 switch (event->event) {
1173 case IB_CM_REQ_ERROR:
1174 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1175 comp = 1;
1176 target->status = -ECONNRESET;
1177 break;
1178
1179 case IB_CM_REP_RECEIVED:
1180 comp = 1;
1181 opcode = *(u8 *) event->private_data;
1182
1183 if (opcode == SRP_LOGIN_RSP) {
1184 struct srp_login_rsp *rsp = event->private_data;
1185
1186 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1187 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1188
1189 target->scsi_host->can_queue = min(target->req_lim,
1190 target->scsi_host->can_queue);
1191 } else {
1192 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1193 target->status = -ECONNRESET;
1194 break;
1195 }
1196
d2fcea7d
VP		 1197 if (!target->rx_ring[0]) {
1198 target->status = srp_alloc_iu_bufs(target);
1199 if (target->status)
1200 break;
1201 }
aef9ec39
RD		 1202
1203 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1204 if (!qp_attr) {
1205 target->status = -ENOMEM;
1206 break;
1207 }
1208
1209 qp_attr->qp_state = IB_QPS_RTR;
1210 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1211 if (target->status)
1212 break;
1213
1214 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1215 if (target->status)
1216 break;
1217
1218 target->status = srp_post_recv(target);
1219 if (target->status)
1220 break;
1221
1222 qp_attr->qp_state = IB_QPS_RTS;
1223 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1224 if (target->status)
1225 break;
1226
1227 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1228 if (target->status)
1229 break;
1230
1231 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1232 if (target->status)
1233 break;
1234
1235 break;
1236
1237 case IB_CM_REJ_RECEIVED:
1238 printk(KERN_DEBUG PFX "REJ received\n");
1239 comp = 1;
1240
1241 srp_cm_rej_handler(cm_id, event, target);
1242 break;
1243
b7ac4ab4
IR		 1244 case IB_CM_DREQ_RECEIVED:
1245 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1246 if (ib_send_cm_drep(cm_id, NULL, 0))
1247 printk(KERN_ERR PFX "Sending CM DREP failed\n");
aef9ec39
RD		 1248 break;
1249
1250 case IB_CM_TIMEWAIT_EXIT:
1251 printk(KERN_ERR PFX "connection closed\n");
1252
1253 comp = 1;
1254 target->status = 0;
1255 break;
1256
b7ac4ab4
IR		 1257 case IB_CM_MRA_RECEIVED:
1258 case IB_CM_DREQ_ERROR:
1259 case IB_CM_DREP_RECEIVED:
1260 break;
1261
aef9ec39
RD		 1262 default:
1263 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1264 break;
1265 }
1266
1267 if (comp)
1268 complete(&target->done);
1269
1270 kfree(qp_attr);
1271
1272 return 0;
1273}
1274
d945e1df
RD		 1275static int srp_send_tsk_mgmt(struct srp_target_port *target,
1276 struct srp_request *req, u8 func)
aef9ec39 1277{
aef9ec39
RD		 1278 struct srp_iu *iu;
1279 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39
RD		 1280
1281 spin_lock_irq(target->scsi_host->host_lock);
1282
1285b3a0
RD		 1283 if (target->state == SRP_TARGET_DEAD ||
1284 target->state == SRP_TARGET_REMOVED) {
d945e1df 1285 req->scmnd->result = DID_BAD_TARGET << 16;
1285b3a0
RD		 1286 goto out;
1287 }
1288
aef9ec39
RD		 1289 init_completion(&req->done);
1290
8cba2077 1291 iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
aef9ec39
RD		 1292 if (!iu)
1293 goto out;
1294
1295 tsk_mgmt = iu->buf;
1296 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1297
1298 tsk_mgmt->opcode = SRP_TSK_MGMT;
d945e1df
RD		 1299 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1300 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
aef9ec39 1301 tsk_mgmt->tsk_mgmt_func = func;
d945e1df 1302 tsk_mgmt->task_tag = req->index;
aef9ec39
RD		 1303
1304 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1305 goto out;
1306
1307 req->tsk_mgmt = iu;
1308
1309 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df 1310
aef9ec39
RD		 1311 if (!wait_for_completion_timeout(&req->done,
1312 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1313 return -1;
aef9ec39 1314
d945e1df 1315 return 0;
aef9ec39
RD		 1316
1317out:
1318 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df
RD		 1319 return -1;
1320}
1321
1322static int srp_find_req(struct srp_target_port *target,
1323 struct scsi_cmnd *scmnd,
1324 struct srp_request **req)
1325{
1326 if (scmnd->host_scribble == (void *) -1L)
1327 return -1;
1328
1329 *req = &target->req_ring[(long) scmnd->host_scribble];
1330
1331 return 0;
aef9ec39
RD		 1332}
1333
1334static int srp_abort(struct scsi_cmnd *scmnd)
1335{
d945e1df
RD		 1336 struct srp_target_port *target = host_to_target(scmnd->device->host);
1337 struct srp_request *req;
1338 int ret = SUCCESS;
1339
aef9ec39
RD		 1340 printk(KERN_ERR "SRP abort called\n");
1341
1033ff67
IR		 1342 if (target->qp_in_error)
1343 return FAILED;
d945e1df
RD		 1344 if (srp_find_req(target, scmnd, &req))
1345 return FAILED;
1346 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1347 return FAILED;
1348
1349 spin_lock_irq(target->scsi_host->host_lock);
1350
1351 if (req->cmd_done) {
1352 srp_remove_req(target, req);
1353 scmnd->scsi_done(scmnd);
1354 } else if (!req->tsk_status) {
1355 srp_remove_req(target, req);
1356 scmnd->result = DID_ABORT << 16;
1357 } else
1358 ret = FAILED;
1359
1360 spin_unlock_irq(target->scsi_host->host_lock);
1361
1362 return ret;
aef9ec39
RD		 1363}
1364
1365static int srp_reset_device(struct scsi_cmnd *scmnd)
1366{
d945e1df
RD		 1367 struct srp_target_port *target = host_to_target(scmnd->device->host);
1368 struct srp_request *req, *tmp;
1369
aef9ec39
RD		 1370 printk(KERN_ERR "SRP reset_device called\n");
1371
1033ff67
IR		 1372 if (target->qp_in_error)
1373 return FAILED;
d945e1df
RD		 1374 if (srp_find_req(target, scmnd, &req))
1375 return FAILED;
1376 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1377 return FAILED;
1378 if (req->tsk_status)
1379 return FAILED;
1380
1381 spin_lock_irq(target->scsi_host->host_lock);
1382
1383 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
526b4caa
IR		 1384 if (req->scmnd->device == scmnd->device)
1385 srp_reset_req(target, req);
d945e1df
RD		 1386
1387 spin_unlock_irq(target->scsi_host->host_lock);
1388
1389 return SUCCESS;
aef9ec39
RD		 1390}
1391
1392static int srp_reset_host(struct scsi_cmnd *scmnd)
1393{
1394 struct srp_target_port *target = host_to_target(scmnd->device->host);
1395 int ret = FAILED;
1396
1397 printk(KERN_ERR PFX "SRP reset_host called\n");
1398
1399 if (!srp_reconnect_target(target))
1400 ret = SUCCESS;
1401
1402 return ret;
1403}
1404
6ecb0c84
RD		 1405static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1406{
1407 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1408
1409 if (target->state == SRP_TARGET_DEAD ||
1410 target->state == SRP_TARGET_REMOVED)
1411 return -ENODEV;
1412
1413 return sprintf(buf, "0x%016llx\n",
1414 (unsigned long long) be64_to_cpu(target->id_ext));
1415}
1416
1417static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1418{
1419 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1420
1421 if (target->state == SRP_TARGET_DEAD ||
1422 target->state == SRP_TARGET_REMOVED)
1423 return -ENODEV;
1424
1425 return sprintf(buf, "0x%016llx\n",
1426 (unsigned long long) be64_to_cpu(target->ioc_guid));
1427}
1428
1429static ssize_t show_service_id(struct class_device *cdev, char *buf)
1430{
1431 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1432
1433 if (target->state == SRP_TARGET_DEAD ||
1434 target->state == SRP_TARGET_REMOVED)
1435 return -ENODEV;
1436
1437 return sprintf(buf, "0x%016llx\n",
1438 (unsigned long long) be64_to_cpu(target->service_id));
1439}
1440
1441static ssize_t show_pkey(struct class_device *cdev, char *buf)
1442{
1443 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1444
1445 if (target->state == SRP_TARGET_DEAD ||
1446 target->state == SRP_TARGET_REMOVED)
1447 return -ENODEV;
1448
1449 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1450}
1451
1452static ssize_t show_dgid(struct class_device *cdev, char *buf)
1453{
1454 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1455
1456 if (target->state == SRP_TARGET_DEAD ||
1457 target->state == SRP_TARGET_REMOVED)
1458 return -ENODEV;
1459
1460 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1461 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1462 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1463 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1464 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1465 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1466 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1467 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1468 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1469}
1470
3633b3d0
IR		 1471static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
1472{
1473 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1474
1475 if (target->state == SRP_TARGET_DEAD ||
1476 target->state == SRP_TARGET_REMOVED)
1477 return -ENODEV;
1478
1479 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1480 be16_to_cpu(target->orig_dgid[0]),
1481 be16_to_cpu(target->orig_dgid[1]),
1482 be16_to_cpu(target->orig_dgid[2]),
1483 be16_to_cpu(target->orig_dgid[3]),
1484 be16_to_cpu(target->orig_dgid[4]),
1485 be16_to_cpu(target->orig_dgid[5]),
1486 be16_to_cpu(target->orig_dgid[6]),
1487 be16_to_cpu(target->orig_dgid[7]));
1488}
1489
6bfa24fa
RD		 1490static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1491{
1492 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1493
1494 if (target->state == SRP_TARGET_DEAD ||
1495 target->state == SRP_TARGET_REMOVED)
1496 return -ENODEV;
1497
1498 return sprintf(buf, "%d\n", target->zero_req_lim);
1499}
1500
ded7f1a1
IR		 1501static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1502{
1503 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1504
1505 return sprintf(buf, "%d\n", target->srp_host->port);
1506}
1507
1508static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1509{
1510 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1511
1512 return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1513}
1514
1515static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1516static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1517static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1518static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1519static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
3633b3d0 1520static CLASS_DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
ded7f1a1
IR		 1521static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1522static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1523static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
6ecb0c84
RD		 1524
1525static struct class_device_attribute *srp_host_attrs[] = {
1526 &class_device_attr_id_ext,
1527 &class_device_attr_ioc_guid,
1528 &class_device_attr_service_id,
1529 &class_device_attr_pkey,
1530 &class_device_attr_dgid,
3633b3d0 1531 &class_device_attr_orig_dgid,
6bfa24fa 1532 &class_device_attr_zero_req_lim,
ded7f1a1
IR		 1533 &class_device_attr_local_ib_port,
1534 &class_device_attr_local_ib_device,
6ecb0c84
RD		 1535 NULL
1536};
1537
aef9ec39
RD		 1538static struct scsi_host_template srp_template = {
1539 .module = THIS_MODULE,
b7f008fd
RD		 1540 .name = "InfiniBand SRP initiator",
1541 .proc_name = DRV_NAME,
aef9ec39
RD		 1542 .info = srp_target_info,
1543 .queuecommand = srp_queuecommand,
1544 .eh_abort_handler = srp_abort,
1545 .eh_device_reset_handler = srp_reset_device,
1546 .eh_host_reset_handler = srp_reset_host,
1547 .can_queue = SRP_SQ_SIZE,
1548 .this_id = -1,
aef9ec39 1549 .cmd_per_lun = SRP_SQ_SIZE,
6ecb0c84 1550 .use_clustering = ENABLE_CLUSTERING,
fff09a8e 1551 .use_sg_chaining = ENABLE_SG_CHAINING,
6ecb0c84 1552 .shost_attrs = srp_host_attrs
aef9ec39
RD		 1553};
1554
1555static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1556{
3236822b
FT		 1557 struct srp_rport_identifiers ids;
1558 struct srp_rport *rport;
1559
aef9ec39
RD		 1560 sprintf(target->target_name, "SRP.T10:%016llX",
1561 (unsigned long long) be64_to_cpu(target->id_ext));
1562
f5358a17 1563 if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
aef9ec39
RD		 1564 return -ENODEV;
1565
3236822b
FT		 1566 memcpy(ids.port_id, &target->id_ext, 8);
1567 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 1568 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 1569 rport = srp_rport_add(target->scsi_host, &ids);
1570 if (IS_ERR(rport)) {
1571 scsi_remove_host(target->scsi_host);
1572 return PTR_ERR(rport);
1573 }
1574
b3589fd4 1575 spin_lock(&host->target_lock);
aef9ec39 1576 list_add_tail(&target->list, &host->target_list);
b3589fd4 1577 spin_unlock(&host->target_lock);
aef9ec39
RD		 1578
1579 target->state = SRP_TARGET_LIVE;
1580
aef9ec39 1581 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 1582 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 1583
1584 return 0;
1585}
1586
1587static void srp_release_class_dev(struct class_device *class_dev)
1588{
1589 struct srp_host *host =
1590 container_of(class_dev, struct srp_host, class_dev);
1591
1592 complete(&host->released);
1593}
1594
1595static struct class srp_class = {
1596 .name = "infiniband_srp",
1597 .release = srp_release_class_dev
1598};
1599
1600/*
1601 * Target ports are added by writing
1602 *
1603 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1604 * pkey=<P_Key>,service_id=<service ID>
1605 *
1606 * to the add_target sysfs attribute.
1607 */
1608enum {
1609 SRP_OPT_ERR = 0,
1610 SRP_OPT_ID_EXT = 1 << 0,
1611 SRP_OPT_IOC_GUID = 1 << 1,
1612 SRP_OPT_DGID = 1 << 2,
1613 SRP_OPT_PKEY = 1 << 3,
1614 SRP_OPT_SERVICE_ID = 1 << 4,
1615 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 1616 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 1617 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 1618 SRP_OPT_INITIATOR_EXT = 1 << 8,
aef9ec39
RD		 1619 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1620 SRP_OPT_IOC_GUID |
1621 SRP_OPT_DGID |
1622 SRP_OPT_PKEY |
1623 SRP_OPT_SERVICE_ID),
1624};
1625
1626static match_table_t srp_opt_tokens = {
52fb2b50
VP		 1627 { SRP_OPT_ID_EXT, "id_ext=%s" },
1628 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1629 { SRP_OPT_DGID, "dgid=%s" },
1630 { SRP_OPT_PKEY, "pkey=%x" },
1631 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1632 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1633 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 1634 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 1635 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
52fb2b50 1636 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 1637};
1638
1639static int srp_parse_options(const char *buf, struct srp_target_port *target)
1640{
1641 char *options, *sep_opt;
1642 char *p;
1643 char dgid[3];
1644 substring_t args[MAX_OPT_ARGS];
1645 int opt_mask = 0;
1646 int token;
1647 int ret = -EINVAL;
1648 int i;
1649
1650 options = kstrdup(buf, GFP_KERNEL);
1651 if (!options)
1652 return -ENOMEM;
1653
1654 sep_opt = options;
1655 while ((p = strsep(&sep_opt, ",")) != NULL) {
1656 if (!*p)
1657 continue;
1658
1659 token = match_token(p, srp_opt_tokens, args);
1660 opt_mask |= token;
1661
1662 switch (token) {
1663 case SRP_OPT_ID_EXT:
1664 p = match_strdup(args);
a20f3a6d
IR		 1665 if (!p) {
1666 ret = -ENOMEM;
1667 goto out;
1668 }
aef9ec39
RD		 1669 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1670 kfree(p);
1671 break;
1672
1673 case SRP_OPT_IOC_GUID:
1674 p = match_strdup(args);
a20f3a6d
IR		 1675 if (!p) {
1676 ret = -ENOMEM;
1677 goto out;
1678 }
aef9ec39
RD		 1679 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1680 kfree(p);
1681 break;
1682
1683 case SRP_OPT_DGID:
1684 p = match_strdup(args);
a20f3a6d
IR		 1685 if (!p) {
1686 ret = -ENOMEM;
1687 goto out;
1688 }
aef9ec39
RD		 1689 if (strlen(p) != 32) {
1690 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
ce1823f0 1691 kfree(p);
aef9ec39
RD		 1692 goto out;
1693 }
1694
1695 for (i = 0; i < 16; ++i) {
1696 strlcpy(dgid, p + i * 2, 3);
1697 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1698 }
bf17c1c7 1699 kfree(p);
3633b3d0 1700 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 1701 break;
1702
1703 case SRP_OPT_PKEY:
1704 if (match_hex(args, &token)) {
1705 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1706 goto out;
1707 }
1708 target->path.pkey = cpu_to_be16(token);
1709 break;
1710
1711 case SRP_OPT_SERVICE_ID:
1712 p = match_strdup(args);
a20f3a6d
IR		 1713 if (!p) {
1714 ret = -ENOMEM;
1715 goto out;
1716 }
aef9ec39 1717 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 1718 target->path.service_id = target->service_id;
aef9ec39
RD		 1719 kfree(p);
1720 break;
1721
1722 case SRP_OPT_MAX_SECT:
1723 if (match_int(args, &token)) {
1724 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1725 goto out;
1726 }
1727 target->scsi_host->max_sectors = token;
1728 break;
1729
52fb2b50
VP		 1730 case SRP_OPT_MAX_CMD_PER_LUN:
1731 if (match_int(args, &token)) {
1732 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1733 goto out;
1734 }
1735 target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1736 break;
1737
0c0450db
R		 1738 case SRP_OPT_IO_CLASS:
1739 if (match_hex(args, &token)) {
1740 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1741 goto out;
1742 }
1743 if (token != SRP_REV10_IB_IO_CLASS &&
1744 token != SRP_REV16A_IB_IO_CLASS) {
1745 printk(KERN_WARNING PFX "unknown IO class parameter value"
1746 " %x specified (use %x or %x).\n",
1747 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1748 goto out;
1749 }
1750 target->io_class = token;
1751 break;
1752
01cb9bcb
IR		 1753 case SRP_OPT_INITIATOR_EXT:
1754 p = match_strdup(args);
a20f3a6d
IR		 1755 if (!p) {
1756 ret = -ENOMEM;
1757 goto out;
1758 }
01cb9bcb
IR		 1759 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1760 kfree(p);
1761 break;
1762
aef9ec39
RD		 1763 default:
1764 printk(KERN_WARNING PFX "unknown parameter or missing value "
1765 "'%s' in target creation request\n", p);
1766 goto out;
1767 }
1768 }
1769
1770 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1771 ret = 0;
1772 else
1773 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1774 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1775 !(srp_opt_tokens[i].token & opt_mask))
1776 printk(KERN_WARNING PFX "target creation request is "
1777 "missing parameter '%s'\n",
1778 srp_opt_tokens[i].pattern);
1779
1780out:
1781 kfree(options);
1782 return ret;
1783}
1784
1785static ssize_t srp_create_target(struct class_device *class_dev,
1786 const char *buf, size_t count)
1787{
1788 struct srp_host *host =
1789 container_of(class_dev, struct srp_host, class_dev);
1790 struct Scsi_Host *target_host;
1791 struct srp_target_port *target;
1792 int ret;
1793 int i;
1794
1795 target_host = scsi_host_alloc(&srp_template,
1796 sizeof (struct srp_target_port));
1797 if (!target_host)
1798 return -ENOMEM;
1799
3236822b 1800 target_host->transportt = ib_srp_transport_template;
3c8edf0e
AR		 1801 target_host->max_lun = SRP_MAX_LUN;
1802 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 1803
aef9ec39 1804 target = host_to_target(target_host);
aef9ec39 1805
0c0450db 1806 target->io_class = SRP_REV16A_IB_IO_CLASS;
aef9ec39
RD		 1807 target->scsi_host = target_host;
1808 target->srp_host = host;
1809
d945e1df 1810 INIT_LIST_HEAD(&target->free_reqs);
aef9ec39 1811 INIT_LIST_HEAD(&target->req_queue);
d945e1df
RD		 1812 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1813 target->req_ring[i].index = i;
1814 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1815 }
aef9ec39
RD		 1816
1817 ret = srp_parse_options(buf, target);
1818 if (ret)
1819 goto err;
1820
f5358a17 1821 ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
aef9ec39
RD		 1822
1823 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1824 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1825 (unsigned long long) be64_to_cpu(target->id_ext),
1826 (unsigned long long) be64_to_cpu(target->ioc_guid),
1827 be16_to_cpu(target->path.pkey),
1828 (unsigned long long) be64_to_cpu(target->service_id),
1829 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1830 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1831 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1832 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1833 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1834 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1835 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1836 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1837
1838 ret = srp_create_target_ib(target);
1839 if (ret)
1840 goto err;
1841
f5358a17 1842 target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
aef9ec39
RD		 1843 if (IS_ERR(target->cm_id)) {
1844 ret = PTR_ERR(target->cm_id);
1845 goto err_free;
1846 }
1847
1033ff67 1848 target->qp_in_error = 0;
aef9ec39
RD		 1849 ret = srp_connect_target(target);
1850 if (ret) {
1851 printk(KERN_ERR PFX "Connection failed\n");
1852 goto err_cm_id;
1853 }
1854
1855 ret = srp_add_target(host, target);
1856 if (ret)
1857 goto err_disconnect;
1858
1859 return count;
1860
1861err_disconnect:
1862 srp_disconnect_target(target);
1863
1864err_cm_id:
1865 ib_destroy_cm_id(target->cm_id);
1866
1867err_free:
1868 srp_free_target_ib(target);
1869
1870err:
1871 scsi_host_put(target_host);
1872
1873 return ret;
1874}
1875
1876static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1877
1878static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1879{
1880 struct srp_host *host =
1881 container_of(class_dev, struct srp_host, class_dev);
1882
f5358a17 1883 return sprintf(buf, "%s\n", host->dev->dev->name);
aef9ec39
RD		 1884}
1885
1886static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1887
1888static ssize_t show_port(struct class_device *class_dev, char *buf)
1889{
1890 struct srp_host *host =
1891 container_of(class_dev, struct srp_host, class_dev);
1892
1893 return sprintf(buf, "%d\n", host->port);
1894}
1895
1896static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1897
f5358a17 1898static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 1899{
1900 struct srp_host *host;
1901
1902 host = kzalloc(sizeof *host, GFP_KERNEL);
1903 if (!host)
1904 return NULL;
1905
1906 INIT_LIST_HEAD(&host->target_list);
b3589fd4 1907 spin_lock_init(&host->target_lock);
aef9ec39
RD		 1908 init_completion(&host->released);
1909 host->dev = device;
1910 host->port = port;
1911
aef9ec39 1912 host->class_dev.class = &srp_class;
f5358a17 1913 host->class_dev.dev = device->dev->dma_device;
aef9ec39 1914 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
f5358a17 1915 device->dev->name, port);
aef9ec39
RD		 1916
1917 if (class_device_register(&host->class_dev))
f5358a17 1918 goto free_host;
aef9ec39
RD		 1919 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1920 goto err_class;
1921 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1922 goto err_class;
1923 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1924 goto err_class;
1925
1926 return host;
1927
1928err_class:
1929 class_device_unregister(&host->class_dev);
1930
f5358a17 1931free_host:
aef9ec39
RD		 1932 kfree(host);
1933
1934 return NULL;
1935}
1936
1937static void srp_add_one(struct ib_device *device)
1938{
f5358a17
RD		 1939 struct srp_device *srp_dev;
1940 struct ib_device_attr *dev_attr;
1941 struct ib_fmr_pool_param fmr_param;
aef9ec39 1942 struct srp_host *host;
aef9ec39
RD		 1943 int s, e, p;
1944
f5358a17
RD		 1945 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1946 if (!dev_attr)
cf311cd4 1947 return;
aef9ec39 1948
f5358a17
RD		 1949 if (ib_query_device(device, dev_attr)) {
1950 printk(KERN_WARNING PFX "Query device failed for %s\n",
1951 device->name);
1952 goto free_attr;
1953 }
1954
1955 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1956 if (!srp_dev)
1957 goto free_attr;
1958
1959 /*
1960 * Use the smallest page size supported by the HCA, down to a
1961 * minimum of 512 bytes (which is the smallest sector that a
1962 * SCSI command will ever carry).
1963 */
1964 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1965 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
bf628dc2 1966 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
f5358a17
RD		 1967
1968 INIT_LIST_HEAD(&srp_dev->dev_list);
1969
1970 srp_dev->dev = device;
1971 srp_dev->pd = ib_alloc_pd(device);
1972 if (IS_ERR(srp_dev->pd))
1973 goto free_dev;
1974
1975 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1976 IB_ACCESS_LOCAL_WRITE |
1977 IB_ACCESS_REMOTE_READ |
1978 IB_ACCESS_REMOTE_WRITE);
1979 if (IS_ERR(srp_dev->mr))
1980 goto err_pd;
1981
1982 memset(&fmr_param, 0, sizeof fmr_param);
1983 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
1984 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
1985 fmr_param.cache = 1;
1986 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1987 fmr_param.page_shift = srp_dev->fmr_page_shift;
1988 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
1989 IB_ACCESS_REMOTE_WRITE |
1990 IB_ACCESS_REMOTE_READ);
1991
1992 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1993 if (IS_ERR(srp_dev->fmr_pool))
1994 srp_dev->fmr_pool = NULL;
aef9ec39 1995
07ebafba 1996 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 1997 s = 0;
1998 e = 0;
1999 } else {
2000 s = 1;
2001 e = device->phys_port_cnt;
2002 }
2003
2004 for (p = s; p <= e; ++p) {
f5358a17 2005 host = srp_add_port(srp_dev, p);
aef9ec39 2006 if (host)
f5358a17 2007 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2008 }
2009
f5358a17
RD		 2010 ib_set_client_data(device, &srp_client, srp_dev);
2011
2012 goto free_attr;
2013
2014err_pd:
2015 ib_dealloc_pd(srp_dev->pd);
2016
2017free_dev:
2018 kfree(srp_dev);
2019
2020free_attr:
2021 kfree(dev_attr);
aef9ec39
RD		 2022}
2023
2024static void srp_remove_one(struct ib_device *device)
2025{
f5358a17 2026 struct srp_device *srp_dev;
aef9ec39
RD		 2027 struct srp_host *host, *tmp_host;
2028 LIST_HEAD(target_list);
2029 struct srp_target_port *target, *tmp_target;
aef9ec39 2030
f5358a17 2031 srp_dev = ib_get_client_data(device, &srp_client);
aef9ec39 2032
f5358a17 2033 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
aef9ec39
RD		 2034 class_device_unregister(&host->class_dev);
2035 /*
2036 * Wait for the sysfs entry to go away, so that no new
2037 * target ports can be created.
2038 */
2039 wait_for_completion(&host->released);
2040
2041 /*
2042 * Mark all target ports as removed, so we stop queueing
2043 * commands and don't try to reconnect.
2044 */
b3589fd4 2045 spin_lock(&host->target_lock);
549c5fc2 2046 list_for_each_entry(target, &host->target_list, list) {
0c5b3952
IR		 2047 spin_lock_irq(target->scsi_host->host_lock);
2048 target->state = SRP_TARGET_REMOVED;
2049 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39 2050 }
b3589fd4 2051 spin_unlock(&host->target_lock);
aef9ec39
RD		 2052
2053 /*
2054 * Wait for any reconnection tasks that may have
2055 * started before we marked our target ports as
2056 * removed, and any target port removal tasks.
2057 */
2058 flush_scheduled_work();
2059
2060 list_for_each_entry_safe(target, tmp_target,
2061 &host->target_list, list) {
b0e47c8b 2062 srp_remove_host(target->scsi_host);
ad696989 2063 scsi_remove_host(target->scsi_host);
aef9ec39
RD		 2064 srp_disconnect_target(target);
2065 ib_destroy_cm_id(target->cm_id);
2066 srp_free_target_ib(target);
2067 scsi_host_put(target->scsi_host);
2068 }
2069
aef9ec39
RD		 2070 kfree(host);
2071 }
2072
f5358a17
RD		 2073 if (srp_dev->fmr_pool)
2074 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2075 ib_dereg_mr(srp_dev->mr);
2076 ib_dealloc_pd(srp_dev->pd);
2077
2078 kfree(srp_dev);
aef9ec39
RD		 2079}
2080
3236822b
FT		 2081static struct srp_function_template ib_srp_transport_functions = {
2082};
2083
aef9ec39
RD		 2084static int __init srp_init_module(void)
2085{
2086 int ret;
2087
3236822b
FT		 2088 ib_srp_transport_template =
2089 srp_attach_transport(&ib_srp_transport_functions);
2090 if (!ib_srp_transport_template)
2091 return -ENOMEM;
2092
74b0a15b
VP		 2093 srp_template.sg_tablesize = srp_sg_tablesize;
2094 srp_max_iu_len = (sizeof (struct srp_cmd) +
2095 sizeof (struct srp_indirect_buf) +
2096 srp_sg_tablesize * 16);
2097
aef9ec39
RD		 2098 ret = class_register(&srp_class);
2099 if (ret) {
2100 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
3236822b 2101 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2102 return ret;
2103 }
2104
c1a0b23b
MT		 2105 ib_sa_register_client(&srp_sa_client);
2106
aef9ec39
RD		 2107 ret = ib_register_client(&srp_client);
2108 if (ret) {
2109 printk(KERN_ERR PFX "couldn't register IB client\n");
3236822b 2110 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2111 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2112 class_unregister(&srp_class);
2113 return ret;
2114 }
2115
2116 return 0;
2117}
2118
2119static void __exit srp_cleanup_module(void)
2120{
2121 ib_unregister_client(&srp_client);
c1a0b23b 2122 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 2123 class_unregister(&srp_class);
3236822b 2124 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2125}
2126
2127module_init(srp_init_module);
2128module_exit(srp_cleanup_module);
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