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aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
aef9ec39
RD		 31 */
32
aef9ec39
RD		 33#include <linux/module.h>
34#include <linux/init.h>
35#include <linux/slab.h>
36#include <linux/err.h>
37#include <linux/string.h>
38#include <linux/parser.h>
39#include <linux/random.h>
de25968c 40#include <linux/jiffies.h>
aef9ec39
RD		 41
42#include <asm/atomic.h>
43
44#include <scsi/scsi.h>
45#include <scsi/scsi_device.h>
46#include <scsi/scsi_dbg.h>
47#include <scsi/srp.h>
3236822b 48#include <scsi/scsi_transport_srp.h>
aef9ec39 49
aef9ec39
RD		 50#include "ib_srp.h"
51
52#define DRV_NAME "ib_srp"
53#define PFX DRV_NAME ": "
54#define DRV_VERSION "0.2"
55#define DRV_RELDATE "November 1, 2005"
56
57MODULE_AUTHOR("Roland Dreier");
58MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
59 "v" DRV_VERSION " (" DRV_RELDATE ")");
60MODULE_LICENSE("Dual BSD/GPL");
61
74b0a15b
VP		 62static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
63static int srp_max_iu_len;
64
65module_param(srp_sg_tablesize, int, 0444);
66MODULE_PARM_DESC(srp_sg_tablesize,
1e89a194 67 "Max number of gather/scatter entries per I/O (default is 12, max 255)");
74b0a15b 68
aef9ec39
RD		 69static int topspin_workarounds = 1;
70
71module_param(topspin_workarounds, int, 0444);
72MODULE_PARM_DESC(topspin_workarounds,
73 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
74
559ce8f1
IR		 75static int mellanox_workarounds = 1;
76
77module_param(mellanox_workarounds, int, 0444);
78MODULE_PARM_DESC(mellanox_workarounds,
79 "Enable workarounds for Mellanox SRP target bugs if != 0");
80
aef9ec39
RD		 81static void srp_add_one(struct ib_device *device);
82static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 83static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
84static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 85static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
86
3236822b
FT		 87static struct scsi_transport_template *ib_srp_transport_template;
88
aef9ec39
RD		 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
05321937
GKH		 139 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
140 direction);
141 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 142 goto out_free_buf;
143
144 iu->size = size;
145 iu->direction = direction;
146
147 return iu;
148
149out_free_buf:
150 kfree(iu->buf);
151out_free_iu:
152 kfree(iu);
153out:
154 return NULL;
155}
156
157static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
158{
159 if (!iu)
160 return;
161
05321937
GKH		 162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
163 iu->direction);
aef9ec39
RD		 164 kfree(iu->buf);
165 kfree(iu);
166}
167
168static void srp_qp_event(struct ib_event *event, void *context)
169{
170 printk(KERN_ERR PFX "QP event %d\n", event->event);
171}
172
173static int srp_init_qp(struct srp_target_port *target,
174 struct ib_qp *qp)
175{
176 struct ib_qp_attr *attr;
177 int ret;
178
179 attr = kmalloc(sizeof *attr, GFP_KERNEL);
180 if (!attr)
181 return -ENOMEM;
182
969a60f9
RD		 183 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
184 target->srp_host->port,
185 be16_to_cpu(target->path.pkey),
186 &attr->pkey_index);
aef9ec39
RD		 187 if (ret)
188 goto out;
189
190 attr->qp_state = IB_QPS_INIT;
191 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
192 IB_ACCESS_REMOTE_WRITE);
193 attr->port_num = target->srp_host->port;
194
195 ret = ib_modify_qp(qp, attr,
196 IB_QP_STATE |
197 IB_QP_PKEY_INDEX |
198 IB_QP_ACCESS_FLAGS |
199 IB_QP_PORT);
200
201out:
202 kfree(attr);
203 return ret;
204}
205
9fe4bcf4
DD		 206static int srp_new_cm_id(struct srp_target_port *target)
207{
208 struct ib_cm_id *new_cm_id;
209
05321937 210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 211 srp_cm_handler, target);
212 if (IS_ERR(new_cm_id))
213 return PTR_ERR(new_cm_id);
214
215 if (target->cm_id)
216 ib_destroy_cm_id(target->cm_id);
217 target->cm_id = new_cm_id;
218
219 return 0;
220}
221
aef9ec39
RD		 222static int srp_create_target_ib(struct srp_target_port *target)
223{
224 struct ib_qp_init_attr *init_attr;
225 int ret;
226
227 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
228 if (!init_attr)
229 return -ENOMEM;
230
9c03dc9f
BVA		 231 target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
232 srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
233 if (IS_ERR(target->recv_cq)) {
234 ret = PTR_ERR(target->recv_cq);
da9d2f07 235 goto err;
aef9ec39
RD		 236 }
237
9c03dc9f
BVA		 238 target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
239 srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
240 if (IS_ERR(target->send_cq)) {
241 ret = PTR_ERR(target->send_cq);
da9d2f07 242 goto err_recv_cq;
9c03dc9f
BVA		 243 }
244
245 ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 246
247 init_attr->event_handler = srp_qp_event;
248 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
249 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
250 init_attr->cap.max_recv_sge = 1;
251 init_attr->cap.max_send_sge = 1;
252 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
253 init_attr->qp_type = IB_QPT_RC;
9c03dc9f
BVA		 254 init_attr->send_cq = target->send_cq;
255 init_attr->recv_cq = target->recv_cq;
aef9ec39 256
05321937 257 target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
aef9ec39
RD		 258 if (IS_ERR(target->qp)) {
259 ret = PTR_ERR(target->qp);
da9d2f07 260 goto err_send_cq;
aef9ec39
RD		 261 }
262
263 ret = srp_init_qp(target, target->qp);
da9d2f07
RD		 264 if (ret)
265 goto err_qp;
aef9ec39 266
da9d2f07
RD		 267 kfree(init_attr);
268 return 0;
269
270err_qp:
271 ib_destroy_qp(target->qp);
272
273err_send_cq:
274 ib_destroy_cq(target->send_cq);
275
276err_recv_cq:
277 ib_destroy_cq(target->recv_cq);
278
279err:
aef9ec39
RD		 280 kfree(init_attr);
281 return ret;
282}
283
284static void srp_free_target_ib(struct srp_target_port *target)
285{
286 int i;
287
288 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 289 ib_destroy_cq(target->send_cq);
290 ib_destroy_cq(target->recv_cq);
aef9ec39
RD		 291
292 for (i = 0; i < SRP_RQ_SIZE; ++i)
293 srp_free_iu(target->srp_host, target->rx_ring[i]);
dd5e6e38 294 for (i = 0; i < SRP_SQ_SIZE; ++i)
aef9ec39
RD		 295 srp_free_iu(target->srp_host, target->tx_ring[i]);
296}
297
298static void srp_path_rec_completion(int status,
299 struct ib_sa_path_rec *pathrec,
300 void *target_ptr)
301{
302 struct srp_target_port *target = target_ptr;
303
304 target->status = status;
305 if (status)
7aa54bd7
DD		 306 shost_printk(KERN_ERR, target->scsi_host,
307 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 308 else
309 target->path = *pathrec;
310 complete(&target->done);
311}
312
313static int srp_lookup_path(struct srp_target_port *target)
314{
315 target->path.numb_path = 1;
316
317 init_completion(&target->done);
318
c1a0b23b 319 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 320 target->srp_host->srp_dev->dev,
aef9ec39
RD		 321 target->srp_host->port,
322 &target->path,
247e020e 323 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 324 IB_SA_PATH_REC_DGID |
325 IB_SA_PATH_REC_SGID |
326 IB_SA_PATH_REC_NUMB_PATH |
327 IB_SA_PATH_REC_PKEY,
328 SRP_PATH_REC_TIMEOUT_MS,
329 GFP_KERNEL,
330 srp_path_rec_completion,
331 target, &target->path_query);
332 if (target->path_query_id < 0)
333 return target->path_query_id;
334
335 wait_for_completion(&target->done);
336
337 if (target->status < 0)
7aa54bd7
DD		 338 shost_printk(KERN_WARNING, target->scsi_host,
339 PFX "Path record query failed\n");
aef9ec39
RD		 340
341 return target->status;
342}
343
344static int srp_send_req(struct srp_target_port *target)
345{
346 struct {
347 struct ib_cm_req_param param;
348 struct srp_login_req priv;
349 } *req = NULL;
350 int status;
351
352 req = kzalloc(sizeof *req, GFP_KERNEL);
353 if (!req)
354 return -ENOMEM;
355
356 req->param.primary_path = &target->path;
357 req->param.alternate_path = NULL;
358 req->param.service_id = target->service_id;
359 req->param.qp_num = target->qp->qp_num;
360 req->param.qp_type = target->qp->qp_type;
361 req->param.private_data = &req->priv;
362 req->param.private_data_len = sizeof req->priv;
363 req->param.flow_control = 1;
364
365 get_random_bytes(&req->param.starting_psn, 4);
366 req->param.starting_psn &= 0xffffff;
367
368 /*
369 * Pick some arbitrary defaults here; we could make these
370 * module parameters if anyone cared about setting them.
371 */
372 req->param.responder_resources = 4;
373 req->param.remote_cm_response_timeout = 20;
374 req->param.local_cm_response_timeout = 20;
375 req->param.retry_count = 7;
376 req->param.rnr_retry_count = 7;
377 req->param.max_cm_retries = 15;
378
379 req->priv.opcode = SRP_LOGIN_REQ;
380 req->priv.tag = 0;
74b0a15b 381 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
aef9ec39
RD		 382 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
383 SRP_BUF_FORMAT_INDIRECT);
0c0450db 384 /*
3cd96564 385 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 386 * port identifier format is 8 bytes of ID extension followed
387 * by 8 bytes of GUID. Older drafts put the two halves in the
388 * opposite order, so that the GUID comes first.
389 *
390 * Targets conforming to these obsolete drafts can be
391 * recognized by the I/O Class they report.
392 */
393 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
394 memcpy(req->priv.initiator_port_id,
01cb9bcb 395 &target->path.sgid.global.interface_id, 8);
0c0450db 396 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 397 &target->initiator_ext, 8);
0c0450db
R		 398 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
399 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
400 } else {
401 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 402 &target->initiator_ext, 8);
403 memcpy(req->priv.initiator_port_id + 8,
404 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 405 memcpy(req->priv.target_port_id, &target->id_ext, 8);
406 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
407 }
408
aef9ec39
RD		 409 /*
410 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 411 * zero out the first 8 bytes of our initiator port ID and set
412 * the second 8 bytes to the local node GUID.
aef9ec39 413 */
5d7cbfd6 414 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 415 shost_printk(KERN_DEBUG, target->scsi_host,
416 PFX "Topspin/Cisco initiator port ID workaround "
417 "activated for target GUID %016llx\n",
418 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 419 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 420 memcpy(req->priv.initiator_port_id + 8,
05321937 421 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 422 }
aef9ec39
RD		 423
424 status = ib_send_cm_req(target->cm_id, &req->param);
425
426 kfree(req);
427
428 return status;
429}
430
431static void srp_disconnect_target(struct srp_target_port *target)
432{
433 /* XXX should send SRP_I_LOGOUT request */
434
435 init_completion(&target->done);
e6581056 436 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
7aa54bd7
DD		 437 shost_printk(KERN_DEBUG, target->scsi_host,
438 PFX "Sending CM DREQ failed\n");
e6581056
RD		 439 return;
440 }
aef9ec39
RD		 441 wait_for_completion(&target->done);
442}
443
c4028958 444static void srp_remove_work(struct work_struct *work)
aef9ec39 445{
c4028958
DH		 446 struct srp_target_port *target =
447 container_of(work, struct srp_target_port, work);
aef9ec39
RD		 448
449 spin_lock_irq(target->scsi_host->host_lock);
450 if (target->state != SRP_TARGET_DEAD) {
451 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 452 return;
453 }
454 target->state = SRP_TARGET_REMOVED;
455 spin_unlock_irq(target->scsi_host->host_lock);
456
b3589fd4 457 spin_lock(&target->srp_host->target_lock);
aef9ec39 458 list_del(&target->list);
b3589fd4 459 spin_unlock(&target->srp_host->target_lock);
aef9ec39 460
3236822b 461 srp_remove_host(target->scsi_host);
aef9ec39
RD		 462 scsi_remove_host(target->scsi_host);
463 ib_destroy_cm_id(target->cm_id);
464 srp_free_target_ib(target);
465 scsi_host_put(target->scsi_host);
aef9ec39
RD		 466}
467
468static int srp_connect_target(struct srp_target_port *target)
469{
9fe4bcf4 470 int retries = 3;
aef9ec39
RD		 471 int ret;
472
473 ret = srp_lookup_path(target);
474 if (ret)
475 return ret;
476
477 while (1) {
478 init_completion(&target->done);
479 ret = srp_send_req(target);
480 if (ret)
481 return ret;
482 wait_for_completion(&target->done);
483
484 /*
485 * The CM event handling code will set status to
486 * SRP_PORT_REDIRECT if we get a port redirect REJ
487 * back, or SRP_DLID_REDIRECT if we get a lid/qp
488 * redirect REJ back.
489 */
490 switch (target->status) {
491 case 0:
492 return 0;
493
494 case SRP_PORT_REDIRECT:
495 ret = srp_lookup_path(target);
496 if (ret)
497 return ret;
498 break;
499
500 case SRP_DLID_REDIRECT:
501 break;
502
9fe4bcf4
DD		 503 case SRP_STALE_CONN:
504 /* Our current CM id was stale, and is now in timewait.
505 * Try to reconnect with a new one.
506 */
507 if (!retries-- || srp_new_cm_id(target)) {
508 shost_printk(KERN_ERR, target->scsi_host, PFX
509 "giving up on stale connection\n");
510 target->status = -ECONNRESET;
511 return target->status;
512 }
513
514 shost_printk(KERN_ERR, target->scsi_host, PFX
515 "retrying stale connection\n");
516 break;
517
aef9ec39
RD		 518 default:
519 return target->status;
520 }
521 }
522}
523
d945e1df
RD		 524static void srp_unmap_data(struct scsi_cmnd *scmnd,
525 struct srp_target_port *target,
526 struct srp_request *req)
527{
bb350d1d 528 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 529 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
530 scmnd->sc_data_direction != DMA_FROM_DEVICE))
531 return;
532
f5358a17
RD		 533 if (req->fmr) {
534 ib_fmr_pool_unmap(req->fmr);
535 req->fmr = NULL;
536 }
537
05321937 538 ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
bb350d1d 539 scsi_sg_count(scmnd), scmnd->sc_data_direction);
d945e1df
RD		 540}
541
526b4caa
IR		 542static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
543{
544 srp_unmap_data(req->scmnd, target, req);
545 list_move_tail(&req->list, &target->free_reqs);
546}
547
548static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
549{
550 req->scmnd->result = DID_RESET << 16;
551 req->scmnd->scsi_done(req->scmnd);
552 srp_remove_req(target, req);
553}
554
aef9ec39
RD		 555static int srp_reconnect_target(struct srp_target_port *target)
556{
aef9ec39 557 struct ib_qp_attr qp_attr;
526b4caa 558 struct srp_request *req, *tmp;
aef9ec39
RD		 559 struct ib_wc wc;
560 int ret;
aef9ec39
RD		 561
562 spin_lock_irq(target->scsi_host->host_lock);
563 if (target->state != SRP_TARGET_LIVE) {
564 spin_unlock_irq(target->scsi_host->host_lock);
565 return -EAGAIN;
566 }
567 target->state = SRP_TARGET_CONNECTING;
568 spin_unlock_irq(target->scsi_host->host_lock);
569
570 srp_disconnect_target(target);
571 /*
572 * Now get a new local CM ID so that we avoid confusing the
573 * target in case things are really fouled up.
574 */
9fe4bcf4
DD		 575 ret = srp_new_cm_id(target);
576 if (ret)
aef9ec39 577 goto err;
aef9ec39
RD		 578
579 qp_attr.qp_state = IB_QPS_RESET;
580 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
581 if (ret)
582 goto err;
583
584 ret = srp_init_qp(target, target->qp);
585 if (ret)
586 goto err;
587
9c03dc9f
BVA		 588 while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
589 ; /* nothing */
590 while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
aef9ec39
RD		 591 ; /* nothing */
592
d916a8f1 593 spin_lock_irq(target->scsi_host->host_lock);
526b4caa
IR		 594 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
595 srp_reset_req(target, req);
d916a8f1 596 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39
RD		 597
598 target->rx_head = 0;
599 target->tx_head = 0;
600 target->tx_tail = 0;
aef9ec39 601
1033ff67 602 target->qp_in_error = 0;
aef9ec39
RD		 603 ret = srp_connect_target(target);
604 if (ret)
605 goto err;
606
607 spin_lock_irq(target->scsi_host->host_lock);
608 if (target->state == SRP_TARGET_CONNECTING) {
609 ret = 0;
610 target->state = SRP_TARGET_LIVE;
611 } else
612 ret = -EAGAIN;
613 spin_unlock_irq(target->scsi_host->host_lock);
614
615 return ret;
616
617err:
7aa54bd7
DD		 618 shost_printk(KERN_ERR, target->scsi_host,
619 PFX "reconnect failed (%d), removing target port.\n", ret);
aef9ec39
RD		 620
621 /*
622 * We couldn't reconnect, so kill our target port off.
623 * However, we have to defer the real removal because we might
624 * be in the context of the SCSI error handler now, which
625 * would deadlock if we call scsi_remove_host().
626 */
627 spin_lock_irq(target->scsi_host->host_lock);
628 if (target->state == SRP_TARGET_CONNECTING) {
629 target->state = SRP_TARGET_DEAD;
c4028958 630 INIT_WORK(&target->work, srp_remove_work);
aef9ec39
RD		 631 schedule_work(&target->work);
632 }
633 spin_unlock_irq(target->scsi_host->host_lock);
634
635 return ret;
636}
637
559ce8f1 638static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
f5358a17
RD		 639 int sg_cnt, struct srp_request *req,
640 struct srp_direct_buf *buf)
641{
642 u64 io_addr = 0;
643 u64 *dma_pages;
644 u32 len;
645 int page_cnt;
646 int i, j;
647 int ret;
05321937 648 struct srp_device *dev = target->srp_host->srp_dev;
85507bcc 649 struct ib_device *ibdev = dev->dev;
bb350d1d 650 struct scatterlist *sg;
f5358a17
RD		 651
652 if (!dev->fmr_pool)
653 return -ENODEV;
654
5d7cbfd6
RD		 655 if (srp_target_is_mellanox(target) &&
656 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
559ce8f1
IR		 657 return -EINVAL;
658
f5358a17 659 len = page_cnt = 0;
bb350d1d
FT		 660 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
661 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 662
bb350d1d 663 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
f5358a17
RD		 664 if (i > 0)
665 return -EINVAL;
666 else
667 ++page_cnt;
668 }
bb350d1d 669 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
f5358a17
RD		 670 ~dev->fmr_page_mask) {
671 if (i < sg_cnt - 1)
672 return -EINVAL;
673 else
674 ++page_cnt;
675 }
676
85507bcc 677 len += dma_len;
f5358a17
RD		 678 }
679
680 page_cnt += len >> dev->fmr_page_shift;
681 if (page_cnt > SRP_FMR_SIZE)
682 return -ENOMEM;
683
684 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
685 if (!dma_pages)
686 return -ENOMEM;
687
688 page_cnt = 0;
bb350d1d
FT		 689 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
690 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc
RC		 691
692 for (j = 0; j < dma_len; j += dev->fmr_page_size)
f5358a17 693 dma_pages[page_cnt++] =
bb350d1d 694 (ib_sg_dma_address(ibdev, sg) &
85507bcc
RC		 695 dev->fmr_page_mask) + j;
696 }
f5358a17
RD		 697
698 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
adfaa888 699 dma_pages, page_cnt, io_addr);
f5358a17
RD		 700 if (IS_ERR(req->fmr)) {
701 ret = PTR_ERR(req->fmr);
6583eb3d 702 req->fmr = NULL;
f5358a17
RD		 703 goto out;
704 }
705
85507bcc
RC		 706 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
707 ~dev->fmr_page_mask);
f5358a17
RD		 708 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
709 buf->len = cpu_to_be32(len);
710
711 ret = 0;
712
713out:
714 kfree(dma_pages);
715
716 return ret;
717}
718
aef9ec39
RD		 719static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
720 struct srp_request *req)
721{
cf368713 722 struct scatterlist *scat;
aef9ec39 723 struct srp_cmd *cmd = req->cmd->buf;
cf368713 724 int len, nents, count;
f5358a17 725 u8 fmt = SRP_DATA_DESC_DIRECT;
85507bcc
RC		 726 struct srp_device *dev;
727 struct ib_device *ibdev;
aef9ec39 728
bb350d1d 729 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 730 return sizeof (struct srp_cmd);
731
732 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
733 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 734 shost_printk(KERN_WARNING, target->scsi_host,
735 PFX "Unhandled data direction %d\n",
736 scmnd->sc_data_direction);
aef9ec39
RD		 737 return -EINVAL;
738 }
739
bb350d1d
FT		 740 nents = scsi_sg_count(scmnd);
741 scat = scsi_sglist(scmnd);
aef9ec39 742
05321937 743 dev = target->srp_host->srp_dev;
85507bcc
RC		 744 ibdev = dev->dev;
745
746 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
f5358a17
RD		 747
748 fmt = SRP_DATA_DESC_DIRECT;
749 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 750
cf368713 751 if (count == 1) {
f5358a17
RD		 752 /*
753 * The midlayer only generated a single gather/scatter
754 * entry, or DMA mapping coalesced everything to a
755 * single entry. So a direct descriptor along with
756 * the DMA MR suffices.
757 */
cf368713 758 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 759
85507bcc
RC		 760 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
761 buf->key = cpu_to_be32(dev->mr->rkey);
762 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
559ce8f1 763 } else if (srp_map_fmr(target, scat, count, req,
f5358a17
RD		 764 (void *) cmd->add_data)) {
765 /*
766 * FMR mapping failed, and the scatterlist has more
767 * than one entry. Generate an indirect memory
768 * descriptor.
769 */
cf368713 770 struct srp_indirect_buf *buf = (void *) cmd->add_data;
bb350d1d 771 struct scatterlist *sg;
cf368713 772 u32 datalen = 0;
f5358a17 773 int i;
aef9ec39 774
cf368713 775 fmt = SRP_DATA_DESC_INDIRECT;
f5358a17
RD		 776 len = sizeof (struct srp_cmd) +
777 sizeof (struct srp_indirect_buf) +
778 count * sizeof (struct srp_direct_buf);
779
bb350d1d
FT		 780 scsi_for_each_sg(scmnd, sg, count, i) {
781 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
85507bcc 782
f5358a17 783 buf->desc_list[i].va =
bb350d1d 784 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
f5358a17 785 buf->desc_list[i].key =
85507bcc
RC		 786 cpu_to_be32(dev->mr->rkey);
787 buf->desc_list[i].len = cpu_to_be32(dma_len);
788 datalen += dma_len;
f5358a17 789 }
aef9ec39 790
cf368713
RD		 791 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
792 cmd->data_out_desc_cnt = count;
793 else
794 cmd->data_in_desc_cnt = count;
795
f5358a17
RD		 796 buf->table_desc.va =
797 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
cf368713 798 buf->table_desc.key =
05321937 799 cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
cf368713
RD		 800 buf->table_desc.len =
801 cpu_to_be32(count * sizeof (struct srp_direct_buf));
802
cf368713 803 buf->len = cpu_to_be32(datalen);
aef9ec39
RD		 804 }
805
806 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
807 cmd->buf_fmt = fmt << 4;
808 else
809 cmd->buf_fmt = fmt;
810
aef9ec39
RD		 811 return len;
812}
813
05a1d750
DD		 814/*
815 * Must be called with target->scsi_host->host_lock held to protect
816 * req_lim and tx_head. Lock cannot be dropped between call here and
817 * call to __srp_post_send().
818 *
819 * Note:
820 * An upper limit for the number of allocated information units for each
821 * request type is:
822 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
823 * more than Scsi_Host.can_queue requests.
824 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
825 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
826 * one unanswered SRP request to an initiator.
827 */
828static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
829 enum srp_iu_type iu_type)
830{
831 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
832 struct srp_iu *iu;
833
834 srp_send_completion(target->send_cq, target);
835
836 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
837 return NULL;
838
839 /* Initiator responses to target requests do not consume credits */
840 if (target->req_lim <= rsv && iu_type != SRP_IU_RSP) {
841 ++target->zero_req_lim;
842 return NULL;
843 }
844
845 iu = target->tx_ring[target->tx_head & SRP_SQ_MASK];
846 iu->type = iu_type;
847 return iu;
848}
849
850/*
851 * Must be called with target->scsi_host->host_lock held to protect
852 * req_lim and tx_head.
853 */
854static int __srp_post_send(struct srp_target_port *target,
855 struct srp_iu *iu, int len)
856{
857 struct ib_sge list;
858 struct ib_send_wr wr, *bad_wr;
859 int ret = 0;
860
861 list.addr = iu->dma;
862 list.length = len;
863 list.lkey = target->srp_host->srp_dev->mr->lkey;
864
865 wr.next = NULL;
866 wr.wr_id = target->tx_head & SRP_SQ_MASK;
867 wr.sg_list = &list;
868 wr.num_sge = 1;
869 wr.opcode = IB_WR_SEND;
870 wr.send_flags = IB_SEND_SIGNALED;
871
872 ret = ib_post_send(target->qp, &wr, &bad_wr);
873
874 if (!ret) {
875 ++target->tx_head;
876 if (iu->type != SRP_IU_RSP)
877 --target->req_lim;
878 }
879
880 return ret;
881}
882
c996bb47
BVA		 883static int srp_post_recv(struct srp_target_port *target)
884{
885 unsigned long flags;
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 spin_lock_irqsave(target->scsi_host->host_lock, flags);
893
dd5e6e38 894 next = target->rx_head & SRP_RQ_MASK;
c996bb47
BVA		 895 wr.wr_id = next;
896 iu = target->rx_ring[next];
897
898 list.addr = iu->dma;
899 list.length = iu->size;
900 list.lkey = target->srp_host->srp_dev->mr->lkey;
901
902 wr.next = NULL;
903 wr.sg_list = &list;
904 wr.num_sge = 1;
905
906 ret = ib_post_recv(target->qp, &wr, &bad_wr);
907 if (!ret)
908 ++target->rx_head;
909
910 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
911
912 return ret;
913}
914
aef9ec39
RD		 915static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
916{
917 struct srp_request *req;
918 struct scsi_cmnd *scmnd;
919 unsigned long flags;
920 s32 delta;
921
922 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
923
924 spin_lock_irqsave(target->scsi_host->host_lock, flags);
925
926 target->req_lim += delta;
927
928 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
929
930 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
931 if (be32_to_cpu(rsp->resp_data_len) < 4)
932 req->tsk_status = -1;
933 else
934 req->tsk_status = rsp->data[3];
935 complete(&req->done);
936 } else {
d945e1df 937 scmnd = req->scmnd;
aef9ec39 938 if (!scmnd)
7aa54bd7
DD		 939 shost_printk(KERN_ERR, target->scsi_host,
940 "Null scmnd for RSP w/tag %016llx\n",
941 (unsigned long long) rsp->tag);
aef9ec39
RD		 942 scmnd->result = rsp->status;
943
944 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
945 memcpy(scmnd->sense_buffer, rsp->data +
946 be32_to_cpu(rsp->resp_data_len),
947 min_t(int, be32_to_cpu(rsp->sense_data_len),
948 SCSI_SENSE_BUFFERSIZE));
949 }
950
951 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 952 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 953 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 954 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 955
aef9ec39 956 if (!req->tsk_mgmt) {
aef9ec39
RD		 957 scmnd->host_scribble = (void *) -1L;
958 scmnd->scsi_done(scmnd);
959
d945e1df 960 srp_remove_req(target, req);
aef9ec39
RD		 961 } else
962 req->cmd_done = 1;
963 }
964
965 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
966}
967
bb12588a
DD		 968static int srp_response_common(struct srp_target_port *target, s32 req_delta,
969 void *rsp, int len)
970{
971 struct ib_device *dev;
972 unsigned long flags;
973 struct srp_iu *iu;
974 int err = 1;
975
976 dev = target->srp_host->srp_dev->dev;
977
978 spin_lock_irqsave(target->scsi_host->host_lock, flags);
979 target->req_lim += req_delta;
980
981 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
982 if (!iu) {
983 shost_printk(KERN_ERR, target->scsi_host, PFX
984 "no IU available to send response\n");
985 goto out;
986 }
987
988 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
989 memcpy(iu->buf, rsp, len);
990 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
991
992 err = __srp_post_send(target, iu, len);
993 if (err)
994 shost_printk(KERN_ERR, target->scsi_host, PFX
995 "unable to post response: %d\n", err);
996
997out:
998 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
999 return err;
1000}
1001
1002static void srp_process_cred_req(struct srp_target_port *target,
1003 struct srp_cred_req *req)
1004{
1005 struct srp_cred_rsp rsp = {
1006 .opcode = SRP_CRED_RSP,
1007 .tag = req->tag,
1008 };
1009 s32 delta = be32_to_cpu(req->req_lim_delta);
1010
1011 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1012 shost_printk(KERN_ERR, target->scsi_host, PFX
1013 "problems processing SRP_CRED_REQ\n");
1014}
1015
1016static void srp_process_aer_req(struct srp_target_port *target,
1017 struct srp_aer_req *req)
1018{
1019 struct srp_aer_rsp rsp = {
1020 .opcode = SRP_AER_RSP,
1021 .tag = req->tag,
1022 };
1023 s32 delta = be32_to_cpu(req->req_lim_delta);
1024
1025 shost_printk(KERN_ERR, target->scsi_host, PFX
1026 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1027
1028 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1029 shost_printk(KERN_ERR, target->scsi_host, PFX
1030 "problems processing SRP_AER_REQ\n");
1031}
1032
aef9ec39
RD		 1033static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1034{
85507bcc 1035 struct ib_device *dev;
aef9ec39 1036 struct srp_iu *iu;
c996bb47 1037 int res;
aef9ec39
RD		 1038 u8 opcode;
1039
9c03dc9f 1040 iu = target->rx_ring[wc->wr_id];
aef9ec39 1041
05321937 1042 dev = target->srp_host->srp_dev->dev;
85507bcc
RC		 1043 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1044 DMA_FROM_DEVICE);
aef9ec39
RD		 1045
1046 opcode = *(u8 *) iu->buf;
1047
1048 if (0) {
7aa54bd7
DD		 1049 shost_printk(KERN_ERR, target->scsi_host,
1050 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1051 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1052 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1053 }
1054
1055 switch (opcode) {
1056 case SRP_RSP:
1057 srp_process_rsp(target, iu->buf);
1058 break;
1059
bb12588a
DD		 1060 case SRP_CRED_REQ:
1061 srp_process_cred_req(target, iu->buf);
1062 break;
1063
1064 case SRP_AER_REQ:
1065 srp_process_aer_req(target, iu->buf);
1066 break;
1067
aef9ec39
RD		 1068 case SRP_T_LOGOUT:
1069 /* XXX Handle target logout */
7aa54bd7
DD		 1070 shost_printk(KERN_WARNING, target->scsi_host,
1071 PFX "Got target logout request\n");
aef9ec39
RD		 1072 break;
1073
1074 default:
7aa54bd7
DD		 1075 shost_printk(KERN_WARNING, target->scsi_host,
1076 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1077 break;
1078 }
1079
85507bcc
RC		 1080 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1081 DMA_FROM_DEVICE);
c996bb47
BVA		 1082
1083 res = srp_post_recv(target);
1084 if (res != 0)
1085 shost_printk(KERN_ERR, target->scsi_host,
1086 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1087}
1088
9c03dc9f 1089static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1090{
1091 struct srp_target_port *target = target_ptr;
1092 struct ib_wc wc;
aef9ec39
RD		 1093
1094 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1095 while (ib_poll_cq(cq, 1, &wc) > 0) {
1096 if (wc.status) {
7aa54bd7 1097 shost_printk(KERN_ERR, target->scsi_host,
9c03dc9f 1098 PFX "failed receive status %d\n",
7aa54bd7 1099 wc.status);
1033ff67 1100 target->qp_in_error = 1;
aef9ec39
RD		 1101 break;
1102 }
1103
9c03dc9f
BVA		 1104 srp_handle_recv(target, &wc);
1105 }
1106}
1107
1108static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1109{
1110 struct srp_target_port *target = target_ptr;
1111 struct ib_wc wc;
1112
1113 while (ib_poll_cq(cq, 1, &wc) > 0) {
1114 if (wc.status) {
1115 shost_printk(KERN_ERR, target->scsi_host,
1116 PFX "failed send status %d\n",
1117 wc.status);
1118 target->qp_in_error = 1;
1119 break;
1120 }
1121
1122 ++target->tx_tail;
aef9ec39
RD		 1123 }
1124}
1125
aef9ec39
RD		 1126static int srp_queuecommand(struct scsi_cmnd *scmnd,
1127 void (*done)(struct scsi_cmnd *))
1128{
1129 struct srp_target_port *target = host_to_target(scmnd->device->host);
1130 struct srp_request *req;
1131 struct srp_iu *iu;
1132 struct srp_cmd *cmd;
85507bcc 1133 struct ib_device *dev;
aef9ec39
RD		 1134 int len;
1135
1136 if (target->state == SRP_TARGET_CONNECTING)
1137 goto err;
1138
1139 if (target->state == SRP_TARGET_DEAD ||
1140 target->state == SRP_TARGET_REMOVED) {
1141 scmnd->result = DID_BAD_TARGET << 16;
1142 done(scmnd);
1143 return 0;
1144 }
1145
bb12588a 1146 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39
RD		 1147 if (!iu)
1148 goto err;
1149
05321937 1150 dev = target->srp_host->srp_dev->dev;
85507bcc
RC		 1151 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1152 DMA_TO_DEVICE);
aef9ec39 1153
21c1a907 1154 req = list_first_entry(&target->free_reqs, struct srp_request, list);
aef9ec39
RD		 1155
1156 scmnd->scsi_done = done;
1157 scmnd->result = 0;
d945e1df 1158 scmnd->host_scribble = (void *) (long) req->index;
aef9ec39
RD		 1159
1160 cmd = iu->buf;
1161 memset(cmd, 0, sizeof *cmd);
1162
1163 cmd->opcode = SRP_CMD;
1164 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1165 cmd->tag = req->index;
aef9ec39
RD		 1166 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1167
aef9ec39
RD		 1168 req->scmnd = scmnd;
1169 req->cmd = iu;
1170 req->cmd_done = 0;
1171 req->tsk_mgmt = NULL;
1172
1173 len = srp_map_data(scmnd, target, req);
1174 if (len < 0) {
7aa54bd7
DD		 1175 shost_printk(KERN_ERR, target->scsi_host,
1176 PFX "Failed to map data\n");
aef9ec39
RD		 1177 goto err;
1178 }
1179
85507bcc
RC		 1180 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1181 DMA_TO_DEVICE);
aef9ec39
RD		 1182
1183 if (__srp_post_send(target, iu, len)) {
7aa54bd7 1184 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1185 goto err_unmap;
1186 }
1187
d945e1df 1188 list_move_tail(&req->list, &target->req_queue);
aef9ec39
RD		 1189
1190 return 0;
1191
1192err_unmap:
1193 srp_unmap_data(scmnd, target, req);
1194
1195err:
1196 return SCSI_MLQUEUE_HOST_BUSY;
1197}
1198
1199static int srp_alloc_iu_bufs(struct srp_target_port *target)
1200{
1201 int i;
1202
1203 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1204 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1205 target->max_ti_iu_len,
1206 GFP_KERNEL, DMA_FROM_DEVICE);
1207 if (!target->rx_ring[i])
1208 goto err;
1209 }
1210
dd5e6e38 1211 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39 1212 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
74b0a15b 1213 srp_max_iu_len,
aef9ec39
RD		 1214 GFP_KERNEL, DMA_TO_DEVICE);
1215 if (!target->tx_ring[i])
1216 goto err;
1217 }
1218
1219 return 0;
1220
1221err:
1222 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1223 srp_free_iu(target->srp_host, target->rx_ring[i]);
1224 target->rx_ring[i] = NULL;
1225 }
1226
dd5e6e38 1227 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39
RD		 1228 srp_free_iu(target->srp_host, target->tx_ring[i]);
1229 target->tx_ring[i] = NULL;
1230 }
1231
1232 return -ENOMEM;
1233}
1234
1235static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1236 struct ib_cm_event *event,
1237 struct srp_target_port *target)
1238{
7aa54bd7 1239 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1240 struct ib_class_port_info *cpi;
1241 int opcode;
1242
1243 switch (event->param.rej_rcvd.reason) {
1244 case IB_CM_REJ_PORT_CM_REDIRECT:
1245 cpi = event->param.rej_rcvd.ari;
1246 target->path.dlid = cpi->redirect_lid;
1247 target->path.pkey = cpi->redirect_pkey;
1248 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1249 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1250
1251 target->status = target->path.dlid ?
1252 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1253 break;
1254
1255 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1256 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1257 /*
1258 * Topspin/Cisco SRP gateways incorrectly send
1259 * reject reason code 25 when they mean 24
1260 * (port redirect).
1261 */
1262 memcpy(target->path.dgid.raw,
1263 event->param.rej_rcvd.ari, 16);
1264
7aa54bd7
DD		 1265 shost_printk(KERN_DEBUG, shost,
1266 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1267 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1268 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1269
1270 target->status = SRP_PORT_REDIRECT;
1271 } else {
7aa54bd7
DD		 1272 shost_printk(KERN_WARNING, shost,
1273 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1274 target->status = -ECONNRESET;
1275 }
1276 break;
1277
1278 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1279 shost_printk(KERN_WARNING, shost,
1280 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1281 target->status = -ECONNRESET;
1282 break;
1283
1284 case IB_CM_REJ_CONSUMER_DEFINED:
1285 opcode = *(u8 *) event->private_data;
1286 if (opcode == SRP_LOGIN_REJ) {
1287 struct srp_login_rej *rej = event->private_data;
1288 u32 reason = be32_to_cpu(rej->reason);
1289
1290 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1291 shost_printk(KERN_WARNING, shost,
1292 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1293 else
7aa54bd7
DD		 1294 shost_printk(KERN_WARNING, shost,
1295 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
aef9ec39 1296 } else
7aa54bd7
DD		 1297 shost_printk(KERN_WARNING, shost,
1298 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1299 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1300 target->status = -ECONNRESET;
1301 break;
1302
9fe4bcf4
DD		 1303 case IB_CM_REJ_STALE_CONN:
1304 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1305 target->status = SRP_STALE_CONN;
1306 break;
1307
aef9ec39 1308 default:
7aa54bd7
DD		 1309 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1310 event->param.rej_rcvd.reason);
aef9ec39
RD		 1311 target->status = -ECONNRESET;
1312 }
1313}
1314
1315static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1316{
1317 struct srp_target_port *target = cm_id->context;
1318 struct ib_qp_attr *qp_attr = NULL;
1319 int attr_mask = 0;
1320 int comp = 0;
1321 int opcode = 0;
c996bb47 1322 int i;
aef9ec39
RD		 1323
1324 switch (event->event) {
1325 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1326 shost_printk(KERN_DEBUG, target->scsi_host,
1327 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1328 comp = 1;
1329 target->status = -ECONNRESET;
1330 break;
1331
1332 case IB_CM_REP_RECEIVED:
1333 comp = 1;
1334 opcode = *(u8 *) event->private_data;
1335
1336 if (opcode == SRP_LOGIN_RSP) {
1337 struct srp_login_rsp *rsp = event->private_data;
1338
1339 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1340 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1341
7ade400a
BVA		 1342 /*
1343 * Reserve credits for task management so we don't
1344 * bounce requests back to the SCSI mid-layer.
1345 */
1346 target->scsi_host->can_queue
1347 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1348 target->scsi_host->can_queue);
aef9ec39 1349 } else {
7aa54bd7
DD		 1350 shost_printk(KERN_WARNING, target->scsi_host,
1351 PFX "Unhandled RSP opcode %#x\n", opcode);
aef9ec39
RD		 1352 target->status = -ECONNRESET;
1353 break;
1354 }
1355
d2fcea7d
VP		 1356 if (!target->rx_ring[0]) {
1357 target->status = srp_alloc_iu_bufs(target);
1358 if (target->status)
1359 break;
1360 }
aef9ec39
RD		 1361
1362 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1363 if (!qp_attr) {
1364 target->status = -ENOMEM;
1365 break;
1366 }
1367
1368 qp_attr->qp_state = IB_QPS_RTR;
1369 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1370 if (target->status)
1371 break;
1372
1373 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1374 if (target->status)
1375 break;
1376
c996bb47
BVA		 1377 for (i = 0; i < SRP_RQ_SIZE; i++) {
1378 target->status = srp_post_recv(target);
1379 if (target->status)
1380 break;
1381 }
aef9ec39
RD		 1382 if (target->status)
1383 break;
1384
1385 qp_attr->qp_state = IB_QPS_RTS;
1386 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1387 if (target->status)
1388 break;
1389
1390 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1391 if (target->status)
1392 break;
1393
1394 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1395 if (target->status)
1396 break;
1397
1398 break;
1399
1400 case IB_CM_REJ_RECEIVED:
7aa54bd7 1401 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1402 comp = 1;
1403
1404 srp_cm_rej_handler(cm_id, event, target);
1405 break;
1406
b7ac4ab4 1407 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1408 shost_printk(KERN_WARNING, target->scsi_host,
1409 PFX "DREQ received - connection closed\n");
b7ac4ab4 1410 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1411 shost_printk(KERN_ERR, target->scsi_host,
1412 PFX "Sending CM DREP failed\n");
aef9ec39
RD		 1413 break;
1414
1415 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1416 shost_printk(KERN_ERR, target->scsi_host,
1417 PFX "connection closed\n");
aef9ec39
RD		 1418
1419 comp = 1;
1420 target->status = 0;
1421 break;
1422
b7ac4ab4
IR		 1423 case IB_CM_MRA_RECEIVED:
1424 case IB_CM_DREQ_ERROR:
1425 case IB_CM_DREP_RECEIVED:
1426 break;
1427
aef9ec39 1428 default:
7aa54bd7
DD		 1429 shost_printk(KERN_WARNING, target->scsi_host,
1430 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1431 break;
1432 }
1433
1434 if (comp)
1435 complete(&target->done);
1436
1437 kfree(qp_attr);
1438
1439 return 0;
1440}
1441
d945e1df
RD		 1442static int srp_send_tsk_mgmt(struct srp_target_port *target,
1443 struct srp_request *req, u8 func)
aef9ec39 1444{
aef9ec39
RD		 1445 struct srp_iu *iu;
1446 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39
RD		 1447
1448 spin_lock_irq(target->scsi_host->host_lock);
1449
1285b3a0
RD		 1450 if (target->state == SRP_TARGET_DEAD ||
1451 target->state == SRP_TARGET_REMOVED) {
d945e1df 1452 req->scmnd->result = DID_BAD_TARGET << 16;
1285b3a0
RD		 1453 goto out;
1454 }
1455
aef9ec39
RD		 1456 init_completion(&req->done);
1457
bb12588a 1458 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
aef9ec39
RD		 1459 if (!iu)
1460 goto out;
1461
1462 tsk_mgmt = iu->buf;
1463 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1464
1465 tsk_mgmt->opcode = SRP_TSK_MGMT;
d945e1df
RD		 1466 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1467 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
aef9ec39 1468 tsk_mgmt->tsk_mgmt_func = func;
d945e1df 1469 tsk_mgmt->task_tag = req->index;
aef9ec39
RD		 1470
1471 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1472 goto out;
1473
1474 req->tsk_mgmt = iu;
1475
1476 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df 1477
aef9ec39
RD		 1478 if (!wait_for_completion_timeout(&req->done,
1479 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1480 return -1;
aef9ec39 1481
d945e1df 1482 return 0;
aef9ec39
RD		 1483
1484out:
1485 spin_unlock_irq(target->scsi_host->host_lock);
d945e1df
RD		 1486 return -1;
1487}
1488
1489static int srp_find_req(struct srp_target_port *target,
1490 struct scsi_cmnd *scmnd,
1491 struct srp_request **req)
1492{
1493 if (scmnd->host_scribble == (void *) -1L)
1494 return -1;
1495
1496 *req = &target->req_ring[(long) scmnd->host_scribble];
1497
1498 return 0;
aef9ec39
RD		 1499}
1500
1501static int srp_abort(struct scsi_cmnd *scmnd)
1502{
d945e1df
RD		 1503 struct srp_target_port *target = host_to_target(scmnd->device->host);
1504 struct srp_request *req;
1505 int ret = SUCCESS;
1506
7aa54bd7 1507 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 1508
1033ff67
IR		 1509 if (target->qp_in_error)
1510 return FAILED;
d945e1df
RD		 1511 if (srp_find_req(target, scmnd, &req))
1512 return FAILED;
1513 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1514 return FAILED;
1515
1516 spin_lock_irq(target->scsi_host->host_lock);
1517
1518 if (req->cmd_done) {
1519 srp_remove_req(target, req);
1520 scmnd->scsi_done(scmnd);
1521 } else if (!req->tsk_status) {
1522 srp_remove_req(target, req);
1523 scmnd->result = DID_ABORT << 16;
1524 } else
1525 ret = FAILED;
1526
1527 spin_unlock_irq(target->scsi_host->host_lock);
1528
1529 return ret;
aef9ec39
RD		 1530}
1531
1532static int srp_reset_device(struct scsi_cmnd *scmnd)
1533{
d945e1df
RD		 1534 struct srp_target_port *target = host_to_target(scmnd->device->host);
1535 struct srp_request *req, *tmp;
1536
7aa54bd7 1537 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 1538
1033ff67
IR		 1539 if (target->qp_in_error)
1540 return FAILED;
d945e1df
RD		 1541 if (srp_find_req(target, scmnd, &req))
1542 return FAILED;
1543 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1544 return FAILED;
1545 if (req->tsk_status)
1546 return FAILED;
1547
1548 spin_lock_irq(target->scsi_host->host_lock);
1549
1550 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
526b4caa
IR		 1551 if (req->scmnd->device == scmnd->device)
1552 srp_reset_req(target, req);
d945e1df
RD		 1553
1554 spin_unlock_irq(target->scsi_host->host_lock);
1555
1556 return SUCCESS;
aef9ec39
RD		 1557}
1558
1559static int srp_reset_host(struct scsi_cmnd *scmnd)
1560{
1561 struct srp_target_port *target = host_to_target(scmnd->device->host);
1562 int ret = FAILED;
1563
7aa54bd7 1564 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39
RD		 1565
1566 if (!srp_reconnect_target(target))
1567 ret = SUCCESS;
1568
1569 return ret;
1570}
1571
ee959b00
TJ		 1572static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1573 char *buf)
6ecb0c84 1574{
ee959b00 1575 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1576
1577 if (target->state == SRP_TARGET_DEAD ||
1578 target->state == SRP_TARGET_REMOVED)
1579 return -ENODEV;
1580
1581 return sprintf(buf, "0x%016llx\n",
1582 (unsigned long long) be64_to_cpu(target->id_ext));
1583}
1584
ee959b00
TJ		 1585static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1586 char *buf)
6ecb0c84 1587{
ee959b00 1588 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1589
1590 if (target->state == SRP_TARGET_DEAD ||
1591 target->state == SRP_TARGET_REMOVED)
1592 return -ENODEV;
1593
1594 return sprintf(buf, "0x%016llx\n",
1595 (unsigned long long) be64_to_cpu(target->ioc_guid));
1596}
1597
ee959b00
TJ		 1598static ssize_t show_service_id(struct device *dev,
1599 struct device_attribute *attr, char *buf)
6ecb0c84 1600{
ee959b00 1601 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1602
1603 if (target->state == SRP_TARGET_DEAD ||
1604 target->state == SRP_TARGET_REMOVED)
1605 return -ENODEV;
1606
1607 return sprintf(buf, "0x%016llx\n",
1608 (unsigned long long) be64_to_cpu(target->service_id));
1609}
1610
ee959b00
TJ		 1611static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1612 char *buf)
6ecb0c84 1613{
ee959b00 1614 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1615
1616 if (target->state == SRP_TARGET_DEAD ||
1617 target->state == SRP_TARGET_REMOVED)
1618 return -ENODEV;
1619
1620 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1621}
1622
ee959b00
TJ		 1623static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1624 char *buf)
6ecb0c84 1625{
ee959b00 1626 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84
RD		 1627
1628 if (target->state == SRP_TARGET_DEAD ||
1629 target->state == SRP_TARGET_REMOVED)
1630 return -ENODEV;
1631
5b095d98 1632 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 1633}
1634
ee959b00
TJ		 1635static ssize_t show_orig_dgid(struct device *dev,
1636 struct device_attribute *attr, char *buf)
3633b3d0 1637{
ee959b00 1638 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0
IR		 1639
1640 if (target->state == SRP_TARGET_DEAD ||
1641 target->state == SRP_TARGET_REMOVED)
1642 return -ENODEV;
1643
5b095d98 1644 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 1645}
1646
89de7486
BVA		 1647static ssize_t show_req_lim(struct device *dev,
1648 struct device_attribute *attr, char *buf)
1649{
1650 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1651
1652 if (target->state == SRP_TARGET_DEAD ||
1653 target->state == SRP_TARGET_REMOVED)
1654 return -ENODEV;
1655
1656 return sprintf(buf, "%d\n", target->req_lim);
1657}
1658
ee959b00
TJ		 1659static ssize_t show_zero_req_lim(struct device *dev,
1660 struct device_attribute *attr, char *buf)
6bfa24fa 1661{
ee959b00 1662 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa
RD		 1663
1664 if (target->state == SRP_TARGET_DEAD ||
1665 target->state == SRP_TARGET_REMOVED)
1666 return -ENODEV;
1667
1668 return sprintf(buf, "%d\n", target->zero_req_lim);
1669}
1670
ee959b00
TJ		 1671static ssize_t show_local_ib_port(struct device *dev,
1672 struct device_attribute *attr, char *buf)
ded7f1a1 1673{
ee959b00 1674 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 1675
1676 return sprintf(buf, "%d\n", target->srp_host->port);
1677}
1678
ee959b00
TJ		 1679static ssize_t show_local_ib_device(struct device *dev,
1680 struct device_attribute *attr, char *buf)
ded7f1a1 1681{
ee959b00 1682 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 1683
05321937 1684 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 1685}
1686
ee959b00
TJ		 1687static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1688static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1689static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1690static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1691static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1692static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 1693static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 1694static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1695static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1696static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1697
1698static struct device_attribute *srp_host_attrs[] = {
1699 &dev_attr_id_ext,
1700 &dev_attr_ioc_guid,
1701 &dev_attr_service_id,
1702 &dev_attr_pkey,
1703 &dev_attr_dgid,
1704 &dev_attr_orig_dgid,
89de7486 1705 &dev_attr_req_lim,
ee959b00
TJ		 1706 &dev_attr_zero_req_lim,
1707 &dev_attr_local_ib_port,
1708 &dev_attr_local_ib_device,
6ecb0c84
RD		 1709 NULL
1710};
1711
aef9ec39
RD		 1712static struct scsi_host_template srp_template = {
1713 .module = THIS_MODULE,
b7f008fd
RD		 1714 .name = "InfiniBand SRP initiator",
1715 .proc_name = DRV_NAME,
aef9ec39
RD		 1716 .info = srp_target_info,
1717 .queuecommand = srp_queuecommand,
1718 .eh_abort_handler = srp_abort,
1719 .eh_device_reset_handler = srp_reset_device,
1720 .eh_host_reset_handler = srp_reset_host,
dd5e6e38 1721 .can_queue = SRP_CMD_SQ_SIZE,
aef9ec39 1722 .this_id = -1,
dd5e6e38 1723 .cmd_per_lun = SRP_CMD_SQ_SIZE,
6ecb0c84
RD		 1724 .use_clustering = ENABLE_CLUSTERING,
1725 .shost_attrs = srp_host_attrs
aef9ec39
RD		 1726};
1727
1728static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1729{
3236822b
FT		 1730 struct srp_rport_identifiers ids;
1731 struct srp_rport *rport;
1732
aef9ec39
RD		 1733 sprintf(target->target_name, "SRP.T10:%016llX",
1734 (unsigned long long) be64_to_cpu(target->id_ext));
1735
05321937 1736 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 1737 return -ENODEV;
1738
3236822b
FT		 1739 memcpy(ids.port_id, &target->id_ext, 8);
1740 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 1741 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 1742 rport = srp_rport_add(target->scsi_host, &ids);
1743 if (IS_ERR(rport)) {
1744 scsi_remove_host(target->scsi_host);
1745 return PTR_ERR(rport);
1746 }
1747
b3589fd4 1748 spin_lock(&host->target_lock);
aef9ec39 1749 list_add_tail(&target->list, &host->target_list);
b3589fd4 1750 spin_unlock(&host->target_lock);
aef9ec39
RD		 1751
1752 target->state = SRP_TARGET_LIVE;
1753
aef9ec39 1754 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 1755 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 1756
1757 return 0;
1758}
1759
ee959b00 1760static void srp_release_dev(struct device *dev)
aef9ec39
RD		 1761{
1762 struct srp_host *host =
ee959b00 1763 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1764
1765 complete(&host->released);
1766}
1767
1768static struct class srp_class = {
1769 .name = "infiniband_srp",
ee959b00 1770 .dev_release = srp_release_dev
aef9ec39
RD		 1771};
1772
1773/*
1774 * Target ports are added by writing
1775 *
1776 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1777 * pkey=<P_Key>,service_id=<service ID>
1778 *
1779 * to the add_target sysfs attribute.
1780 */
1781enum {
1782 SRP_OPT_ERR = 0,
1783 SRP_OPT_ID_EXT = 1 << 0,
1784 SRP_OPT_IOC_GUID = 1 << 1,
1785 SRP_OPT_DGID = 1 << 2,
1786 SRP_OPT_PKEY = 1 << 3,
1787 SRP_OPT_SERVICE_ID = 1 << 4,
1788 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 1789 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 1790 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 1791 SRP_OPT_INITIATOR_EXT = 1 << 8,
aef9ec39
RD		 1792 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1793 SRP_OPT_IOC_GUID |
1794 SRP_OPT_DGID |
1795 SRP_OPT_PKEY |
1796 SRP_OPT_SERVICE_ID),
1797};
1798
a447c093 1799static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 1800 { SRP_OPT_ID_EXT, "id_ext=%s" },
1801 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1802 { SRP_OPT_DGID, "dgid=%s" },
1803 { SRP_OPT_PKEY, "pkey=%x" },
1804 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1805 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1806 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 1807 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 1808 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
52fb2b50 1809 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 1810};
1811
1812static int srp_parse_options(const char *buf, struct srp_target_port *target)
1813{
1814 char *options, *sep_opt;
1815 char *p;
1816 char dgid[3];
1817 substring_t args[MAX_OPT_ARGS];
1818 int opt_mask = 0;
1819 int token;
1820 int ret = -EINVAL;
1821 int i;
1822
1823 options = kstrdup(buf, GFP_KERNEL);
1824 if (!options)
1825 return -ENOMEM;
1826
1827 sep_opt = options;
1828 while ((p = strsep(&sep_opt, ",")) != NULL) {
1829 if (!*p)
1830 continue;
1831
1832 token = match_token(p, srp_opt_tokens, args);
1833 opt_mask |= token;
1834
1835 switch (token) {
1836 case SRP_OPT_ID_EXT:
1837 p = match_strdup(args);
a20f3a6d
IR		 1838 if (!p) {
1839 ret = -ENOMEM;
1840 goto out;
1841 }
aef9ec39
RD		 1842 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1843 kfree(p);
1844 break;
1845
1846 case SRP_OPT_IOC_GUID:
1847 p = match_strdup(args);
a20f3a6d
IR		 1848 if (!p) {
1849 ret = -ENOMEM;
1850 goto out;
1851 }
aef9ec39
RD		 1852 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1853 kfree(p);
1854 break;
1855
1856 case SRP_OPT_DGID:
1857 p = match_strdup(args);
a20f3a6d
IR		 1858 if (!p) {
1859 ret = -ENOMEM;
1860 goto out;
1861 }
aef9ec39
RD		 1862 if (strlen(p) != 32) {
1863 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
ce1823f0 1864 kfree(p);
aef9ec39
RD		 1865 goto out;
1866 }
1867
1868 for (i = 0; i < 16; ++i) {
1869 strlcpy(dgid, p + i * 2, 3);
1870 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1871 }
bf17c1c7 1872 kfree(p);
3633b3d0 1873 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 1874 break;
1875
1876 case SRP_OPT_PKEY:
1877 if (match_hex(args, &token)) {
1878 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1879 goto out;
1880 }
1881 target->path.pkey = cpu_to_be16(token);
1882 break;
1883
1884 case SRP_OPT_SERVICE_ID:
1885 p = match_strdup(args);
a20f3a6d
IR		 1886 if (!p) {
1887 ret = -ENOMEM;
1888 goto out;
1889 }
aef9ec39 1890 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 1891 target->path.service_id = target->service_id;
aef9ec39
RD		 1892 kfree(p);
1893 break;
1894
1895 case SRP_OPT_MAX_SECT:
1896 if (match_int(args, &token)) {
1897 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1898 goto out;
1899 }
1900 target->scsi_host->max_sectors = token;
1901 break;
1902
52fb2b50
VP		 1903 case SRP_OPT_MAX_CMD_PER_LUN:
1904 if (match_int(args, &token)) {
1905 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1906 goto out;
1907 }
dd5e6e38 1908 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
52fb2b50
VP		 1909 break;
1910
0c0450db
R		 1911 case SRP_OPT_IO_CLASS:
1912 if (match_hex(args, &token)) {
1913 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1914 goto out;
1915 }
1916 if (token != SRP_REV10_IB_IO_CLASS &&
1917 token != SRP_REV16A_IB_IO_CLASS) {
1918 printk(KERN_WARNING PFX "unknown IO class parameter value"
1919 " %x specified (use %x or %x).\n",
1920 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1921 goto out;
1922 }
1923 target->io_class = token;
1924 break;
1925
01cb9bcb
IR		 1926 case SRP_OPT_INITIATOR_EXT:
1927 p = match_strdup(args);
a20f3a6d
IR		 1928 if (!p) {
1929 ret = -ENOMEM;
1930 goto out;
1931 }
01cb9bcb
IR		 1932 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1933 kfree(p);
1934 break;
1935
aef9ec39
RD		 1936 default:
1937 printk(KERN_WARNING PFX "unknown parameter or missing value "
1938 "'%s' in target creation request\n", p);
1939 goto out;
1940 }
1941 }
1942
1943 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1944 ret = 0;
1945 else
1946 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1947 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1948 !(srp_opt_tokens[i].token & opt_mask))
1949 printk(KERN_WARNING PFX "target creation request is "
1950 "missing parameter '%s'\n",
1951 srp_opt_tokens[i].pattern);
1952
1953out:
1954 kfree(options);
1955 return ret;
1956}
1957
ee959b00
TJ		 1958static ssize_t srp_create_target(struct device *dev,
1959 struct device_attribute *attr,
aef9ec39
RD		 1960 const char *buf, size_t count)
1961{
1962 struct srp_host *host =
ee959b00 1963 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1964 struct Scsi_Host *target_host;
1965 struct srp_target_port *target;
1966 int ret;
1967 int i;
1968
1969 target_host = scsi_host_alloc(&srp_template,
1970 sizeof (struct srp_target_port));
1971 if (!target_host)
1972 return -ENOMEM;
1973
3236822b 1974 target_host->transportt = ib_srp_transport_template;
3c8edf0e
AR		 1975 target_host->max_lun = SRP_MAX_LUN;
1976 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 1977
aef9ec39 1978 target = host_to_target(target_host);
aef9ec39 1979
0c0450db 1980 target->io_class = SRP_REV16A_IB_IO_CLASS;
aef9ec39
RD		 1981 target->scsi_host = target_host;
1982 target->srp_host = host;
1983
d945e1df 1984 INIT_LIST_HEAD(&target->free_reqs);
aef9ec39 1985 INIT_LIST_HEAD(&target->req_queue);
dd5e6e38 1986 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
d945e1df
RD		 1987 target->req_ring[i].index = i;
1988 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1989 }
aef9ec39
RD		 1990
1991 ret = srp_parse_options(buf, target);
1992 if (ret)
1993 goto err;
1994
969a60f9 1995 ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
aef9ec39 1996
7aa54bd7
DD		 1997 shost_printk(KERN_DEBUG, target->scsi_host, PFX
1998 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
5b095d98 1999 "service_id %016llx dgid %pI6\n",
aef9ec39
RD		 2000 (unsigned long long) be64_to_cpu(target->id_ext),
2001 (unsigned long long) be64_to_cpu(target->ioc_guid),
2002 be16_to_cpu(target->path.pkey),
2003 (unsigned long long) be64_to_cpu(target->service_id),
8867cd7c 2004 target->path.dgid.raw);
aef9ec39
RD		 2005
2006 ret = srp_create_target_ib(target);
2007 if (ret)
2008 goto err;
2009
9fe4bcf4
DD		 2010 ret = srp_new_cm_id(target);
2011 if (ret)
aef9ec39 2012 goto err_free;
aef9ec39 2013
1033ff67 2014 target->qp_in_error = 0;
aef9ec39
RD		 2015 ret = srp_connect_target(target);
2016 if (ret) {
7aa54bd7
DD		 2017 shost_printk(KERN_ERR, target->scsi_host,
2018 PFX "Connection failed\n");
aef9ec39
RD		 2019 goto err_cm_id;
2020 }
2021
2022 ret = srp_add_target(host, target);
2023 if (ret)
2024 goto err_disconnect;
2025
2026 return count;
2027
2028err_disconnect:
2029 srp_disconnect_target(target);
2030
2031err_cm_id:
2032 ib_destroy_cm_id(target->cm_id);
2033
2034err_free:
2035 srp_free_target_ib(target);
2036
2037err:
2038 scsi_host_put(target_host);
2039
2040 return ret;
2041}
2042
ee959b00 2043static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2044
ee959b00
TJ		 2045static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2046 char *buf)
aef9ec39 2047{
ee959b00 2048 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2049
05321937 2050 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2051}
2052
ee959b00 2053static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2054
ee959b00
TJ		 2055static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2056 char *buf)
aef9ec39 2057{
ee959b00 2058 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2059
2060 return sprintf(buf, "%d\n", host->port);
2061}
2062
ee959b00 2063static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2064
f5358a17 2065static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2066{
2067 struct srp_host *host;
2068
2069 host = kzalloc(sizeof *host, GFP_KERNEL);
2070 if (!host)
2071 return NULL;
2072
2073 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2074 spin_lock_init(&host->target_lock);
aef9ec39 2075 init_completion(&host->released);
05321937 2076 host->srp_dev = device;
aef9ec39
RD		 2077 host->port = port;
2078
ee959b00
TJ		 2079 host->dev.class = &srp_class;
2080 host->dev.parent = device->dev->dma_device;
d927e38c 2081 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2082
ee959b00 2083 if (device_register(&host->dev))
f5358a17 2084 goto free_host;
ee959b00 2085 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2086 goto err_class;
ee959b00 2087 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2088 goto err_class;
ee959b00 2089 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2090 goto err_class;
2091
2092 return host;
2093
2094err_class:
ee959b00 2095 device_unregister(&host->dev);
aef9ec39 2096
f5358a17 2097free_host:
aef9ec39
RD		 2098 kfree(host);
2099
2100 return NULL;
2101}
2102
2103static void srp_add_one(struct ib_device *device)
2104{
f5358a17
RD		 2105 struct srp_device *srp_dev;
2106 struct ib_device_attr *dev_attr;
2107 struct ib_fmr_pool_param fmr_param;
aef9ec39 2108 struct srp_host *host;
aef9ec39
RD		 2109 int s, e, p;
2110
f5358a17
RD		 2111 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2112 if (!dev_attr)
cf311cd4 2113 return;
aef9ec39 2114
f5358a17
RD		 2115 if (ib_query_device(device, dev_attr)) {
2116 printk(KERN_WARNING PFX "Query device failed for %s\n",
2117 device->name);
2118 goto free_attr;
2119 }
2120
2121 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2122 if (!srp_dev)
2123 goto free_attr;
2124
2125 /*
2126 * Use the smallest page size supported by the HCA, down to a
2127 * minimum of 512 bytes (which is the smallest sector that a
2128 * SCSI command will ever carry).
2129 */
2130 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2131 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
bf628dc2 2132 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
f5358a17
RD		 2133
2134 INIT_LIST_HEAD(&srp_dev->dev_list);
2135
2136 srp_dev->dev = device;
2137 srp_dev->pd = ib_alloc_pd(device);
2138 if (IS_ERR(srp_dev->pd))
2139 goto free_dev;
2140
2141 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2142 IB_ACCESS_LOCAL_WRITE |
2143 IB_ACCESS_REMOTE_READ |
2144 IB_ACCESS_REMOTE_WRITE);
2145 if (IS_ERR(srp_dev->mr))
2146 goto err_pd;
2147
2148 memset(&fmr_param, 0, sizeof fmr_param);
2149 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2150 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2151 fmr_param.cache = 1;
2152 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2153 fmr_param.page_shift = srp_dev->fmr_page_shift;
2154 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2155 IB_ACCESS_REMOTE_WRITE |
2156 IB_ACCESS_REMOTE_READ);
2157
2158 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2159 if (IS_ERR(srp_dev->fmr_pool))
2160 srp_dev->fmr_pool = NULL;
aef9ec39 2161
07ebafba 2162 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2163 s = 0;
2164 e = 0;
2165 } else {
2166 s = 1;
2167 e = device->phys_port_cnt;
2168 }
2169
2170 for (p = s; p <= e; ++p) {
f5358a17 2171 host = srp_add_port(srp_dev, p);
aef9ec39 2172 if (host)
f5358a17 2173 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2174 }
2175
f5358a17
RD		 2176 ib_set_client_data(device, &srp_client, srp_dev);
2177
2178 goto free_attr;
2179
2180err_pd:
2181 ib_dealloc_pd(srp_dev->pd);
2182
2183free_dev:
2184 kfree(srp_dev);
2185
2186free_attr:
2187 kfree(dev_attr);
aef9ec39
RD		 2188}
2189
2190static void srp_remove_one(struct ib_device *device)
2191{
f5358a17 2192 struct srp_device *srp_dev;
aef9ec39
RD		 2193 struct srp_host *host, *tmp_host;
2194 LIST_HEAD(target_list);
2195 struct srp_target_port *target, *tmp_target;
aef9ec39 2196
f5358a17 2197 srp_dev = ib_get_client_data(device, &srp_client);
aef9ec39 2198
f5358a17 2199 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2200 device_unregister(&host->dev);
aef9ec39
RD		 2201 /*
2202 * Wait for the sysfs entry to go away, so that no new
2203 * target ports can be created.
2204 */
2205 wait_for_completion(&host->released);
2206
2207 /*
2208 * Mark all target ports as removed, so we stop queueing
2209 * commands and don't try to reconnect.
2210 */
b3589fd4 2211 spin_lock(&host->target_lock);
549c5fc2 2212 list_for_each_entry(target, &host->target_list, list) {
0c5b3952
IR		 2213 spin_lock_irq(target->scsi_host->host_lock);
2214 target->state = SRP_TARGET_REMOVED;
2215 spin_unlock_irq(target->scsi_host->host_lock);
aef9ec39 2216 }
b3589fd4 2217 spin_unlock(&host->target_lock);
aef9ec39
RD		 2218
2219 /*
2220 * Wait for any reconnection tasks that may have
2221 * started before we marked our target ports as
2222 * removed, and any target port removal tasks.
2223 */
2224 flush_scheduled_work();
2225
2226 list_for_each_entry_safe(target, tmp_target,
2227 &host->target_list, list) {
b0e47c8b 2228 srp_remove_host(target->scsi_host);
ad696989 2229 scsi_remove_host(target->scsi_host);
aef9ec39
RD		 2230 srp_disconnect_target(target);
2231 ib_destroy_cm_id(target->cm_id);
2232 srp_free_target_ib(target);
2233 scsi_host_put(target->scsi_host);
2234 }
2235
aef9ec39
RD		 2236 kfree(host);
2237 }
2238
f5358a17
RD		 2239 if (srp_dev->fmr_pool)
2240 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2241 ib_dereg_mr(srp_dev->mr);
2242 ib_dealloc_pd(srp_dev->pd);
2243
2244 kfree(srp_dev);
aef9ec39
RD		 2245}
2246
3236822b
FT		 2247static struct srp_function_template ib_srp_transport_functions = {
2248};
2249
aef9ec39
RD		 2250static int __init srp_init_module(void)
2251{
2252 int ret;
2253
dd5e6e38
BVA		 2254 BUILD_BUG_ON_NOT_POWER_OF_2(SRP_SQ_SIZE);
2255 BUILD_BUG_ON_NOT_POWER_OF_2(SRP_RQ_SIZE);
2256
1e89a194
DD		 2257 if (srp_sg_tablesize > 255) {
2258 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2259 srp_sg_tablesize = 255;
2260 }
2261
3236822b
FT		 2262 ib_srp_transport_template =
2263 srp_attach_transport(&ib_srp_transport_functions);
2264 if (!ib_srp_transport_template)
2265 return -ENOMEM;
2266
74b0a15b
VP		 2267 srp_template.sg_tablesize = srp_sg_tablesize;
2268 srp_max_iu_len = (sizeof (struct srp_cmd) +
2269 sizeof (struct srp_indirect_buf) +
2270 srp_sg_tablesize * 16);
2271
aef9ec39
RD		 2272 ret = class_register(&srp_class);
2273 if (ret) {
2274 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
3236822b 2275 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2276 return ret;
2277 }
2278
c1a0b23b
MT		 2279 ib_sa_register_client(&srp_sa_client);
2280
aef9ec39
RD		 2281 ret = ib_register_client(&srp_client);
2282 if (ret) {
2283 printk(KERN_ERR PFX "couldn't register IB client\n");
3236822b 2284 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2285 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2286 class_unregister(&srp_class);
2287 return ret;
2288 }
2289
2290 return 0;
2291}
2292
2293static void __exit srp_cleanup_module(void)
2294{
2295 ib_unregister_client(&srp_client);
c1a0b23b 2296 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 2297 class_unregister(&srp_class);
3236822b 2298 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2299}
2300
2301module_init(srp_init_module);
2302module_exit(srp_cleanup_module);
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