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disable some mediatekl custom warnings
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / infiniband / ulp / srp / ib_srp.c
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
33 #define pr_fmt(fmt) PFX fmt
34
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>
42 #include <linux/jiffies.h>
43
44 #include <linux/atomic.h>
45
46 #include <scsi/scsi.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_dbg.h>
49 #include <scsi/srp.h>
50 #include <scsi/scsi_transport_srp.h>
51
52 #include "ib_srp.h"
53
54 #define DRV_NAME "ib_srp"
55 #define PFX DRV_NAME ": "
56 #define DRV_VERSION "0.2"
57 #define DRV_RELDATE "November 1, 2005"
58
59 MODULE_AUTHOR("Roland Dreier");
60 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
61 "v" DRV_VERSION " (" DRV_RELDATE ")");
62 MODULE_LICENSE("Dual BSD/GPL");
63
64 static unsigned int srp_sg_tablesize;
65 static unsigned int cmd_sg_entries;
66 static unsigned int indirect_sg_entries;
67 static bool allow_ext_sg;
68 static int topspin_workarounds = 1;
69
70 module_param(srp_sg_tablesize, uint, 0444);
71 MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
72
73 module_param(cmd_sg_entries, uint, 0444);
74 MODULE_PARM_DESC(cmd_sg_entries,
75 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
76
77 module_param(indirect_sg_entries, uint, 0444);
78 MODULE_PARM_DESC(indirect_sg_entries,
79 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
80
81 module_param(allow_ext_sg, bool, 0444);
82 MODULE_PARM_DESC(allow_ext_sg,
83 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
84
85 module_param(topspin_workarounds, int, 0444);
86 MODULE_PARM_DESC(topspin_workarounds,
87 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
88
89 static void srp_add_one(struct ib_device *device);
90 static void srp_remove_one(struct ib_device *device);
91 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
92 static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
93 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
94
95 static struct scsi_transport_template *ib_srp_transport_template;
96
97 static struct ib_client srp_client = {
98 .name = "srp",
99 .add = srp_add_one,
100 .remove = srp_remove_one
101 };
102
103 static struct ib_sa_client srp_sa_client;
104
105 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
106 {
107 return (struct srp_target_port *) host->hostdata;
108 }
109
110 static const char *srp_target_info(struct Scsi_Host *host)
111 {
112 return host_to_target(host)->target_name;
113 }
114
115 static int srp_target_is_topspin(struct srp_target_port *target)
116 {
117 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
118 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
119
120 return topspin_workarounds &&
121 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
122 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
123 }
124
125 static 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
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))
142 goto out_free_buf;
143
144 iu->size = size;
145 iu->direction = direction;
146
147 return iu;
148
149 out_free_buf:
150 kfree(iu->buf);
151 out_free_iu:
152 kfree(iu);
153 out:
154 return NULL;
155 }
156
157 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
158 {
159 if (!iu)
160 return;
161
162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
163 iu->direction);
164 kfree(iu->buf);
165 kfree(iu);
166 }
167
168 static void srp_qp_event(struct ib_event *event, void *context)
169 {
170 pr_debug("QP event %d\n", event->event);
171 }
172
173 static 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
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);
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
201 out:
202 kfree(attr);
203 return ret;
204 }
205
206 static int srp_new_cm_id(struct srp_target_port *target)
207 {
208 struct ib_cm_id *new_cm_id;
209
210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
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
222 static int srp_create_target_ib(struct srp_target_port *target)
223 {
224 struct ib_qp_init_attr *init_attr;
225 struct ib_cq *recv_cq, *send_cq;
226 struct ib_qp *qp;
227 int ret;
228
229 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
230 if (!init_attr)
231 return -ENOMEM;
232
233 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
234 srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
235 if (IS_ERR(recv_cq)) {
236 ret = PTR_ERR(recv_cq);
237 goto err;
238 }
239
240 send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
241 srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
242 if (IS_ERR(send_cq)) {
243 ret = PTR_ERR(send_cq);
244 goto err_recv_cq;
245 }
246
247 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
248
249 init_attr->event_handler = srp_qp_event;
250 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
251 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
252 init_attr->cap.max_recv_sge = 1;
253 init_attr->cap.max_send_sge = 1;
254 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
255 init_attr->qp_type = IB_QPT_RC;
256 init_attr->send_cq = send_cq;
257 init_attr->recv_cq = recv_cq;
258
259 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
260 if (IS_ERR(qp)) {
261 ret = PTR_ERR(qp);
262 goto err_send_cq;
263 }
264
265 ret = srp_init_qp(target, qp);
266 if (ret)
267 goto err_qp;
268
269 if (target->qp)
270 ib_destroy_qp(target->qp);
271 if (target->recv_cq)
272 ib_destroy_cq(target->recv_cq);
273 if (target->send_cq)
274 ib_destroy_cq(target->send_cq);
275
276 target->qp = qp;
277 target->recv_cq = recv_cq;
278 target->send_cq = send_cq;
279
280 kfree(init_attr);
281 return 0;
282
283 err_qp:
284 ib_destroy_qp(qp);
285
286 err_send_cq:
287 ib_destroy_cq(send_cq);
288
289 err_recv_cq:
290 ib_destroy_cq(recv_cq);
291
292 err:
293 kfree(init_attr);
294 return ret;
295 }
296
297 static void srp_free_target_ib(struct srp_target_port *target)
298 {
299 int i;
300
301 ib_destroy_qp(target->qp);
302 ib_destroy_cq(target->send_cq);
303 ib_destroy_cq(target->recv_cq);
304
305 target->qp = NULL;
306 target->send_cq = target->recv_cq = NULL;
307
308 for (i = 0; i < SRP_RQ_SIZE; ++i)
309 srp_free_iu(target->srp_host, target->rx_ring[i]);
310 for (i = 0; i < SRP_SQ_SIZE; ++i)
311 srp_free_iu(target->srp_host, target->tx_ring[i]);
312 }
313
314 static void srp_path_rec_completion(int status,
315 struct ib_sa_path_rec *pathrec,
316 void *target_ptr)
317 {
318 struct srp_target_port *target = target_ptr;
319
320 target->status = status;
321 if (status)
322 shost_printk(KERN_ERR, target->scsi_host,
323 PFX "Got failed path rec status %d\n", status);
324 else
325 target->path = *pathrec;
326 complete(&target->done);
327 }
328
329 static int srp_lookup_path(struct srp_target_port *target)
330 {
331 target->path.numb_path = 1;
332
333 init_completion(&target->done);
334
335 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
336 target->srp_host->srp_dev->dev,
337 target->srp_host->port,
338 &target->path,
339 IB_SA_PATH_REC_SERVICE_ID |
340 IB_SA_PATH_REC_DGID |
341 IB_SA_PATH_REC_SGID |
342 IB_SA_PATH_REC_NUMB_PATH |
343 IB_SA_PATH_REC_PKEY,
344 SRP_PATH_REC_TIMEOUT_MS,
345 GFP_KERNEL,
346 srp_path_rec_completion,
347 target, &target->path_query);
348 if (target->path_query_id < 0)
349 return target->path_query_id;
350
351 wait_for_completion(&target->done);
352
353 if (target->status < 0)
354 shost_printk(KERN_WARNING, target->scsi_host,
355 PFX "Path record query failed\n");
356
357 return target->status;
358 }
359
360 static int srp_send_req(struct srp_target_port *target)
361 {
362 struct {
363 struct ib_cm_req_param param;
364 struct srp_login_req priv;
365 } *req = NULL;
366 int status;
367
368 req = kzalloc(sizeof *req, GFP_KERNEL);
369 if (!req)
370 return -ENOMEM;
371
372 req->param.primary_path = &target->path;
373 req->param.alternate_path = NULL;
374 req->param.service_id = target->service_id;
375 req->param.qp_num = target->qp->qp_num;
376 req->param.qp_type = target->qp->qp_type;
377 req->param.private_data = &req->priv;
378 req->param.private_data_len = sizeof req->priv;
379 req->param.flow_control = 1;
380
381 get_random_bytes(&req->param.starting_psn, 4);
382 req->param.starting_psn &= 0xffffff;
383
384 /*
385 * Pick some arbitrary defaults here; we could make these
386 * module parameters if anyone cared about setting them.
387 */
388 req->param.responder_resources = 4;
389 req->param.remote_cm_response_timeout = 20;
390 req->param.local_cm_response_timeout = 20;
391 req->param.retry_count = 7;
392 req->param.rnr_retry_count = 7;
393 req->param.max_cm_retries = 15;
394
395 req->priv.opcode = SRP_LOGIN_REQ;
396 req->priv.tag = 0;
397 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
398 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
399 SRP_BUF_FORMAT_INDIRECT);
400 /*
401 * In the published SRP specification (draft rev. 16a), the
402 * port identifier format is 8 bytes of ID extension followed
403 * by 8 bytes of GUID. Older drafts put the two halves in the
404 * opposite order, so that the GUID comes first.
405 *
406 * Targets conforming to these obsolete drafts can be
407 * recognized by the I/O Class they report.
408 */
409 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
410 memcpy(req->priv.initiator_port_id,
411 &target->path.sgid.global.interface_id, 8);
412 memcpy(req->priv.initiator_port_id + 8,
413 &target->initiator_ext, 8);
414 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
415 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
416 } else {
417 memcpy(req->priv.initiator_port_id,
418 &target->initiator_ext, 8);
419 memcpy(req->priv.initiator_port_id + 8,
420 &target->path.sgid.global.interface_id, 8);
421 memcpy(req->priv.target_port_id, &target->id_ext, 8);
422 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
423 }
424
425 /*
426 * Topspin/Cisco SRP targets will reject our login unless we
427 * zero out the first 8 bytes of our initiator port ID and set
428 * the second 8 bytes to the local node GUID.
429 */
430 if (srp_target_is_topspin(target)) {
431 shost_printk(KERN_DEBUG, target->scsi_host,
432 PFX "Topspin/Cisco initiator port ID workaround "
433 "activated for target GUID %016llx\n",
434 (unsigned long long) be64_to_cpu(target->ioc_guid));
435 memset(req->priv.initiator_port_id, 0, 8);
436 memcpy(req->priv.initiator_port_id + 8,
437 &target->srp_host->srp_dev->dev->node_guid, 8);
438 }
439
440 status = ib_send_cm_req(target->cm_id, &req->param);
441
442 kfree(req);
443
444 return status;
445 }
446
447 static bool srp_queue_remove_work(struct srp_target_port *target)
448 {
449 bool changed = false;
450
451 spin_lock_irq(&target->lock);
452 if (target->state != SRP_TARGET_REMOVED) {
453 target->state = SRP_TARGET_REMOVED;
454 changed = true;
455 }
456 spin_unlock_irq(&target->lock);
457
458 if (changed)
459 queue_work(system_long_wq, &target->remove_work);
460
461 return changed;
462 }
463
464 static bool srp_change_conn_state(struct srp_target_port *target,
465 bool connected)
466 {
467 bool changed = false;
468
469 spin_lock_irq(&target->lock);
470 if (target->connected != connected) {
471 target->connected = connected;
472 changed = true;
473 }
474 spin_unlock_irq(&target->lock);
475
476 return changed;
477 }
478
479 static void srp_disconnect_target(struct srp_target_port *target)
480 {
481 if (srp_change_conn_state(target, false)) {
482 /* XXX should send SRP_I_LOGOUT request */
483
484 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
485 shost_printk(KERN_DEBUG, target->scsi_host,
486 PFX "Sending CM DREQ failed\n");
487 }
488 }
489 }
490
491 static void srp_free_req_data(struct srp_target_port *target)
492 {
493 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
494 struct srp_request *req;
495 int i;
496
497 for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
498 kfree(req->fmr_list);
499 kfree(req->map_page);
500 if (req->indirect_dma_addr) {
501 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
502 target->indirect_size,
503 DMA_TO_DEVICE);
504 }
505 kfree(req->indirect_desc);
506 }
507 }
508
509 /**
510 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
511 * @shost: SCSI host whose attributes to remove from sysfs.
512 *
513 * Note: Any attributes defined in the host template and that did not exist
514 * before invocation of this function will be ignored.
515 */
516 static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
517 {
518 struct device_attribute **attr;
519
520 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
521 device_remove_file(&shost->shost_dev, *attr);
522 }
523
524 static void srp_remove_target(struct srp_target_port *target)
525 {
526 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
527
528 srp_del_scsi_host_attr(target->scsi_host);
529 srp_remove_host(target->scsi_host);
530 scsi_remove_host(target->scsi_host);
531 srp_disconnect_target(target);
532 ib_destroy_cm_id(target->cm_id);
533 srp_free_target_ib(target);
534 srp_free_req_data(target);
535 scsi_host_put(target->scsi_host);
536 }
537
538 static void srp_remove_work(struct work_struct *work)
539 {
540 struct srp_target_port *target =
541 container_of(work, struct srp_target_port, remove_work);
542
543 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
544
545 spin_lock(&target->srp_host->target_lock);
546 list_del(&target->list);
547 spin_unlock(&target->srp_host->target_lock);
548
549 srp_remove_target(target);
550 }
551
552 static void srp_rport_delete(struct srp_rport *rport)
553 {
554 struct srp_target_port *target = rport->lld_data;
555
556 srp_queue_remove_work(target);
557 }
558
559 static int srp_connect_target(struct srp_target_port *target)
560 {
561 int retries = 3;
562 int ret;
563
564 WARN_ON_ONCE(target->connected);
565
566 target->qp_in_error = false;
567
568 ret = srp_lookup_path(target);
569 if (ret)
570 return ret;
571
572 while (1) {
573 init_completion(&target->done);
574 ret = srp_send_req(target);
575 if (ret)
576 return ret;
577 wait_for_completion(&target->done);
578
579 /*
580 * The CM event handling code will set status to
581 * SRP_PORT_REDIRECT if we get a port redirect REJ
582 * back, or SRP_DLID_REDIRECT if we get a lid/qp
583 * redirect REJ back.
584 */
585 switch (target->status) {
586 case 0:
587 srp_change_conn_state(target, true);
588 return 0;
589
590 case SRP_PORT_REDIRECT:
591 ret = srp_lookup_path(target);
592 if (ret)
593 return ret;
594 break;
595
596 case SRP_DLID_REDIRECT:
597 break;
598
599 case SRP_STALE_CONN:
600 /* Our current CM id was stale, and is now in timewait.
601 * Try to reconnect with a new one.
602 */
603 if (!retries-- || srp_new_cm_id(target)) {
604 shost_printk(KERN_ERR, target->scsi_host, PFX
605 "giving up on stale connection\n");
606 target->status = -ECONNRESET;
607 return target->status;
608 }
609
610 shost_printk(KERN_ERR, target->scsi_host, PFX
611 "retrying stale connection\n");
612 break;
613
614 default:
615 return target->status;
616 }
617 }
618 }
619
620 static void srp_unmap_data(struct scsi_cmnd *scmnd,
621 struct srp_target_port *target,
622 struct srp_request *req)
623 {
624 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
625 struct ib_pool_fmr **pfmr;
626
627 if (!scsi_sglist(scmnd) ||
628 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
629 scmnd->sc_data_direction != DMA_FROM_DEVICE))
630 return;
631
632 pfmr = req->fmr_list;
633 while (req->nfmr--)
634 ib_fmr_pool_unmap(*pfmr++);
635
636 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
637 scmnd->sc_data_direction);
638 }
639
640 /**
641 * srp_claim_req - Take ownership of the scmnd associated with a request.
642 * @target: SRP target port.
643 * @req: SRP request.
644 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
645 * ownership of @req->scmnd if it equals @scmnd.
646 *
647 * Return value:
648 * Either NULL or a pointer to the SCSI command the caller became owner of.
649 */
650 static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
651 struct srp_request *req,
652 struct scsi_cmnd *scmnd)
653 {
654 unsigned long flags;
655
656 spin_lock_irqsave(&target->lock, flags);
657 if (!scmnd) {
658 scmnd = req->scmnd;
659 req->scmnd = NULL;
660 } else if (req->scmnd == scmnd) {
661 req->scmnd = NULL;
662 } else {
663 scmnd = NULL;
664 }
665 spin_unlock_irqrestore(&target->lock, flags);
666
667 return scmnd;
668 }
669
670 /**
671 * srp_free_req() - Unmap data and add request to the free request list.
672 */
673 static void srp_free_req(struct srp_target_port *target,
674 struct srp_request *req, struct scsi_cmnd *scmnd,
675 s32 req_lim_delta)
676 {
677 unsigned long flags;
678
679 srp_unmap_data(scmnd, target, req);
680
681 spin_lock_irqsave(&target->lock, flags);
682 target->req_lim += req_lim_delta;
683 list_add_tail(&req->list, &target->free_reqs);
684 spin_unlock_irqrestore(&target->lock, flags);
685 }
686
687 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
688 {
689 struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
690
691 if (scmnd) {
692 srp_free_req(target, req, scmnd, 0);
693 scmnd->result = DID_RESET << 16;
694 scmnd->scsi_done(scmnd);
695 }
696 }
697
698 static int srp_reconnect_target(struct srp_target_port *target)
699 {
700 struct Scsi_Host *shost = target->scsi_host;
701 int i, ret;
702
703 scsi_target_block(&shost->shost_gendev);
704
705 srp_disconnect_target(target);
706 /*
707 * Now get a new local CM ID so that we avoid confusing the target in
708 * case things are really fouled up. Doing so also ensures that all CM
709 * callbacks will have finished before a new QP is allocated.
710 */
711 ret = srp_new_cm_id(target);
712 /*
713 * Whether or not creating a new CM ID succeeded, create a new
714 * QP. This guarantees that all completion callback function
715 * invocations have finished before request resetting starts.
716 */
717 if (ret == 0)
718 ret = srp_create_target_ib(target);
719 else
720 srp_create_target_ib(target);
721
722 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
723 struct srp_request *req = &target->req_ring[i];
724 if (req->scmnd)
725 srp_reset_req(target, req);
726 }
727
728 INIT_LIST_HEAD(&target->free_tx);
729 for (i = 0; i < SRP_SQ_SIZE; ++i)
730 list_add(&target->tx_ring[i]->list, &target->free_tx);
731
732 if (ret == 0)
733 ret = srp_connect_target(target);
734
735 scsi_target_unblock(&shost->shost_gendev, ret == 0 ? SDEV_RUNNING :
736 SDEV_TRANSPORT_OFFLINE);
737 target->transport_offline = !!ret;
738
739 if (ret)
740 goto err;
741
742 shost_printk(KERN_INFO, target->scsi_host, PFX "reconnect succeeded\n");
743
744 return ret;
745
746 err:
747 shost_printk(KERN_ERR, target->scsi_host,
748 PFX "reconnect failed (%d), removing target port.\n", ret);
749
750 /*
751 * We couldn't reconnect, so kill our target port off.
752 * However, we have to defer the real removal because we
753 * are in the context of the SCSI error handler now, which
754 * will deadlock if we call scsi_remove_host().
755 */
756 srp_queue_remove_work(target);
757
758 return ret;
759 }
760
761 static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
762 unsigned int dma_len, u32 rkey)
763 {
764 struct srp_direct_buf *desc = state->desc;
765
766 desc->va = cpu_to_be64(dma_addr);
767 desc->key = cpu_to_be32(rkey);
768 desc->len = cpu_to_be32(dma_len);
769
770 state->total_len += dma_len;
771 state->desc++;
772 state->ndesc++;
773 }
774
775 static int srp_map_finish_fmr(struct srp_map_state *state,
776 struct srp_target_port *target)
777 {
778 struct srp_device *dev = target->srp_host->srp_dev;
779 struct ib_pool_fmr *fmr;
780 u64 io_addr = 0;
781
782 if (!state->npages)
783 return 0;
784
785 if (state->npages == 1) {
786 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
787 target->rkey);
788 state->npages = state->fmr_len = 0;
789 return 0;
790 }
791
792 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
793 state->npages, io_addr);
794 if (IS_ERR(fmr))
795 return PTR_ERR(fmr);
796
797 *state->next_fmr++ = fmr;
798 state->nfmr++;
799
800 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
801 state->npages = state->fmr_len = 0;
802 return 0;
803 }
804
805 static void srp_map_update_start(struct srp_map_state *state,
806 struct scatterlist *sg, int sg_index,
807 dma_addr_t dma_addr)
808 {
809 state->unmapped_sg = sg;
810 state->unmapped_index = sg_index;
811 state->unmapped_addr = dma_addr;
812 }
813
814 static int srp_map_sg_entry(struct srp_map_state *state,
815 struct srp_target_port *target,
816 struct scatterlist *sg, int sg_index,
817 int use_fmr)
818 {
819 struct srp_device *dev = target->srp_host->srp_dev;
820 struct ib_device *ibdev = dev->dev;
821 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
822 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
823 unsigned int len;
824 int ret;
825
826 if (!dma_len)
827 return 0;
828
829 if (use_fmr == SRP_MAP_NO_FMR) {
830 /* Once we're in direct map mode for a request, we don't
831 * go back to FMR mode, so no need to update anything
832 * other than the descriptor.
833 */
834 srp_map_desc(state, dma_addr, dma_len, target->rkey);
835 return 0;
836 }
837
838 /* If we start at an offset into the FMR page, don't merge into
839 * the current FMR. Finish it out, and use the kernel's MR for this
840 * sg entry. This is to avoid potential bugs on some SRP targets
841 * that were never quite defined, but went away when the initiator
842 * avoided using FMR on such page fragments.
843 */
844 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
845 ret = srp_map_finish_fmr(state, target);
846 if (ret)
847 return ret;
848
849 srp_map_desc(state, dma_addr, dma_len, target->rkey);
850 srp_map_update_start(state, NULL, 0, 0);
851 return 0;
852 }
853
854 /* If this is the first sg to go into the FMR, save our position.
855 * We need to know the first unmapped entry, its index, and the
856 * first unmapped address within that entry to be able to restart
857 * mapping after an error.
858 */
859 if (!state->unmapped_sg)
860 srp_map_update_start(state, sg, sg_index, dma_addr);
861
862 while (dma_len) {
863 if (state->npages == SRP_FMR_SIZE) {
864 ret = srp_map_finish_fmr(state, target);
865 if (ret)
866 return ret;
867
868 srp_map_update_start(state, sg, sg_index, dma_addr);
869 }
870
871 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
872
873 if (!state->npages)
874 state->base_dma_addr = dma_addr;
875 state->pages[state->npages++] = dma_addr;
876 state->fmr_len += len;
877 dma_addr += len;
878 dma_len -= len;
879 }
880
881 /* If the last entry of the FMR wasn't a full page, then we need to
882 * close it out and start a new one -- we can only merge at page
883 * boundries.
884 */
885 ret = 0;
886 if (len != dev->fmr_page_size) {
887 ret = srp_map_finish_fmr(state, target);
888 if (!ret)
889 srp_map_update_start(state, NULL, 0, 0);
890 }
891 return ret;
892 }
893
894 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
895 struct srp_request *req)
896 {
897 struct scatterlist *scat, *sg;
898 struct srp_cmd *cmd = req->cmd->buf;
899 int i, len, nents, count, use_fmr;
900 struct srp_device *dev;
901 struct ib_device *ibdev;
902 struct srp_map_state state;
903 struct srp_indirect_buf *indirect_hdr;
904 u32 table_len;
905 u8 fmt;
906
907 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
908 return sizeof (struct srp_cmd);
909
910 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
911 scmnd->sc_data_direction != DMA_TO_DEVICE) {
912 shost_printk(KERN_WARNING, target->scsi_host,
913 PFX "Unhandled data direction %d\n",
914 scmnd->sc_data_direction);
915 return -EINVAL;
916 }
917
918 nents = scsi_sg_count(scmnd);
919 scat = scsi_sglist(scmnd);
920
921 dev = target->srp_host->srp_dev;
922 ibdev = dev->dev;
923
924 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
925 if (unlikely(count == 0))
926 return -EIO;
927
928 fmt = SRP_DATA_DESC_DIRECT;
929 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
930
931 if (count == 1) {
932 /*
933 * The midlayer only generated a single gather/scatter
934 * entry, or DMA mapping coalesced everything to a
935 * single entry. So a direct descriptor along with
936 * the DMA MR suffices.
937 */
938 struct srp_direct_buf *buf = (void *) cmd->add_data;
939
940 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
941 buf->key = cpu_to_be32(target->rkey);
942 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
943
944 req->nfmr = 0;
945 goto map_complete;
946 }
947
948 /* We have more than one scatter/gather entry, so build our indirect
949 * descriptor table, trying to merge as many entries with FMR as we
950 * can.
951 */
952 indirect_hdr = (void *) cmd->add_data;
953
954 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
955 target->indirect_size, DMA_TO_DEVICE);
956
957 memset(&state, 0, sizeof(state));
958 state.desc = req->indirect_desc;
959 state.pages = req->map_page;
960 state.next_fmr = req->fmr_list;
961
962 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
963
964 for_each_sg(scat, sg, count, i) {
965 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
966 /* FMR mapping failed, so backtrack to the first
967 * unmapped entry and continue on without using FMR.
968 */
969 dma_addr_t dma_addr;
970 unsigned int dma_len;
971
972 backtrack:
973 sg = state.unmapped_sg;
974 i = state.unmapped_index;
975
976 dma_addr = ib_sg_dma_address(ibdev, sg);
977 dma_len = ib_sg_dma_len(ibdev, sg);
978 dma_len -= (state.unmapped_addr - dma_addr);
979 dma_addr = state.unmapped_addr;
980 use_fmr = SRP_MAP_NO_FMR;
981 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
982 }
983 }
984
985 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
986 goto backtrack;
987
988 /* We've mapped the request, now pull as much of the indirect
989 * descriptor table as we can into the command buffer. If this
990 * target is not using an external indirect table, we are
991 * guaranteed to fit into the command, as the SCSI layer won't
992 * give us more S/G entries than we allow.
993 */
994 req->nfmr = state.nfmr;
995 if (state.ndesc == 1) {
996 /* FMR mapping was able to collapse this to one entry,
997 * so use a direct descriptor.
998 */
999 struct srp_direct_buf *buf = (void *) cmd->add_data;
1000
1001 *buf = req->indirect_desc[0];
1002 goto map_complete;
1003 }
1004
1005 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1006 !target->allow_ext_sg)) {
1007 shost_printk(KERN_ERR, target->scsi_host,
1008 "Could not fit S/G list into SRP_CMD\n");
1009 return -EIO;
1010 }
1011
1012 count = min(state.ndesc, target->cmd_sg_cnt);
1013 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1014
1015 fmt = SRP_DATA_DESC_INDIRECT;
1016 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
1017 len += count * sizeof (struct srp_direct_buf);
1018
1019 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1020 count * sizeof (struct srp_direct_buf));
1021
1022 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1023 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1024 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1025 indirect_hdr->len = cpu_to_be32(state.total_len);
1026
1027 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1028 cmd->data_out_desc_cnt = count;
1029 else
1030 cmd->data_in_desc_cnt = count;
1031
1032 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1033 DMA_TO_DEVICE);
1034
1035 map_complete:
1036 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1037 cmd->buf_fmt = fmt << 4;
1038 else
1039 cmd->buf_fmt = fmt;
1040
1041 return len;
1042 }
1043
1044 /*
1045 * Return an IU and possible credit to the free pool
1046 */
1047 static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1048 enum srp_iu_type iu_type)
1049 {
1050 unsigned long flags;
1051
1052 spin_lock_irqsave(&target->lock, flags);
1053 list_add(&iu->list, &target->free_tx);
1054 if (iu_type != SRP_IU_RSP)
1055 ++target->req_lim;
1056 spin_unlock_irqrestore(&target->lock, flags);
1057 }
1058
1059 /*
1060 * Must be called with target->lock held to protect req_lim and free_tx.
1061 * If IU is not sent, it must be returned using srp_put_tx_iu().
1062 *
1063 * Note:
1064 * An upper limit for the number of allocated information units for each
1065 * request type is:
1066 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1067 * more than Scsi_Host.can_queue requests.
1068 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1069 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1070 * one unanswered SRP request to an initiator.
1071 */
1072 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1073 enum srp_iu_type iu_type)
1074 {
1075 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1076 struct srp_iu *iu;
1077
1078 srp_send_completion(target->send_cq, target);
1079
1080 if (list_empty(&target->free_tx))
1081 return NULL;
1082
1083 /* Initiator responses to target requests do not consume credits */
1084 if (iu_type != SRP_IU_RSP) {
1085 if (target->req_lim <= rsv) {
1086 ++target->zero_req_lim;
1087 return NULL;
1088 }
1089
1090 --target->req_lim;
1091 }
1092
1093 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
1094 list_del(&iu->list);
1095 return iu;
1096 }
1097
1098 static int srp_post_send(struct srp_target_port *target,
1099 struct srp_iu *iu, int len)
1100 {
1101 struct ib_sge list;
1102 struct ib_send_wr wr, *bad_wr;
1103
1104 list.addr = iu->dma;
1105 list.length = len;
1106 list.lkey = target->lkey;
1107
1108 wr.next = NULL;
1109 wr.wr_id = (uintptr_t) iu;
1110 wr.sg_list = &list;
1111 wr.num_sge = 1;
1112 wr.opcode = IB_WR_SEND;
1113 wr.send_flags = IB_SEND_SIGNALED;
1114
1115 return ib_post_send(target->qp, &wr, &bad_wr);
1116 }
1117
1118 static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
1119 {
1120 struct ib_recv_wr wr, *bad_wr;
1121 struct ib_sge list;
1122
1123 list.addr = iu->dma;
1124 list.length = iu->size;
1125 list.lkey = target->lkey;
1126
1127 wr.next = NULL;
1128 wr.wr_id = (uintptr_t) iu;
1129 wr.sg_list = &list;
1130 wr.num_sge = 1;
1131
1132 return ib_post_recv(target->qp, &wr, &bad_wr);
1133 }
1134
1135 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1136 {
1137 struct srp_request *req;
1138 struct scsi_cmnd *scmnd;
1139 unsigned long flags;
1140
1141 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
1142 spin_lock_irqsave(&target->lock, flags);
1143 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1144 spin_unlock_irqrestore(&target->lock, flags);
1145
1146 target->tsk_mgmt_status = -1;
1147 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1148 target->tsk_mgmt_status = rsp->data[3];
1149 complete(&target->tsk_mgmt_done);
1150 } else {
1151 req = &target->req_ring[rsp->tag];
1152 scmnd = srp_claim_req(target, req, NULL);
1153 if (!scmnd) {
1154 shost_printk(KERN_ERR, target->scsi_host,
1155 "Null scmnd for RSP w/tag %016llx\n",
1156 (unsigned long long) rsp->tag);
1157
1158 spin_lock_irqsave(&target->lock, flags);
1159 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1160 spin_unlock_irqrestore(&target->lock, flags);
1161
1162 return;
1163 }
1164 scmnd->result = rsp->status;
1165
1166 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1167 memcpy(scmnd->sense_buffer, rsp->data +
1168 be32_to_cpu(rsp->resp_data_len),
1169 min_t(int, be32_to_cpu(rsp->sense_data_len),
1170 SCSI_SENSE_BUFFERSIZE));
1171 }
1172
1173 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
1174 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1175 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
1176 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
1177
1178 srp_free_req(target, req, scmnd,
1179 be32_to_cpu(rsp->req_lim_delta));
1180
1181 scmnd->host_scribble = NULL;
1182 scmnd->scsi_done(scmnd);
1183 }
1184 }
1185
1186 static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1187 void *rsp, int len)
1188 {
1189 struct ib_device *dev = target->srp_host->srp_dev->dev;
1190 unsigned long flags;
1191 struct srp_iu *iu;
1192 int err;
1193
1194 spin_lock_irqsave(&target->lock, flags);
1195 target->req_lim += req_delta;
1196 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
1197 spin_unlock_irqrestore(&target->lock, flags);
1198
1199 if (!iu) {
1200 shost_printk(KERN_ERR, target->scsi_host, PFX
1201 "no IU available to send response\n");
1202 return 1;
1203 }
1204
1205 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1206 memcpy(iu->buf, rsp, len);
1207 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1208
1209 err = srp_post_send(target, iu, len);
1210 if (err) {
1211 shost_printk(KERN_ERR, target->scsi_host, PFX
1212 "unable to post response: %d\n", err);
1213 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1214 }
1215
1216 return err;
1217 }
1218
1219 static void srp_process_cred_req(struct srp_target_port *target,
1220 struct srp_cred_req *req)
1221 {
1222 struct srp_cred_rsp rsp = {
1223 .opcode = SRP_CRED_RSP,
1224 .tag = req->tag,
1225 };
1226 s32 delta = be32_to_cpu(req->req_lim_delta);
1227
1228 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1229 shost_printk(KERN_ERR, target->scsi_host, PFX
1230 "problems processing SRP_CRED_REQ\n");
1231 }
1232
1233 static void srp_process_aer_req(struct srp_target_port *target,
1234 struct srp_aer_req *req)
1235 {
1236 struct srp_aer_rsp rsp = {
1237 .opcode = SRP_AER_RSP,
1238 .tag = req->tag,
1239 };
1240 s32 delta = be32_to_cpu(req->req_lim_delta);
1241
1242 shost_printk(KERN_ERR, target->scsi_host, PFX
1243 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1244
1245 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1246 shost_printk(KERN_ERR, target->scsi_host, PFX
1247 "problems processing SRP_AER_REQ\n");
1248 }
1249
1250 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1251 {
1252 struct ib_device *dev = target->srp_host->srp_dev->dev;
1253 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
1254 int res;
1255 u8 opcode;
1256
1257 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1258 DMA_FROM_DEVICE);
1259
1260 opcode = *(u8 *) iu->buf;
1261
1262 if (0) {
1263 shost_printk(KERN_ERR, target->scsi_host,
1264 PFX "recv completion, opcode 0x%02x\n", opcode);
1265 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1266 iu->buf, wc->byte_len, true);
1267 }
1268
1269 switch (opcode) {
1270 case SRP_RSP:
1271 srp_process_rsp(target, iu->buf);
1272 break;
1273
1274 case SRP_CRED_REQ:
1275 srp_process_cred_req(target, iu->buf);
1276 break;
1277
1278 case SRP_AER_REQ:
1279 srp_process_aer_req(target, iu->buf);
1280 break;
1281
1282 case SRP_T_LOGOUT:
1283 /* XXX Handle target logout */
1284 shost_printk(KERN_WARNING, target->scsi_host,
1285 PFX "Got target logout request\n");
1286 break;
1287
1288 default:
1289 shost_printk(KERN_WARNING, target->scsi_host,
1290 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1291 break;
1292 }
1293
1294 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1295 DMA_FROM_DEVICE);
1296
1297 res = srp_post_recv(target, iu);
1298 if (res != 0)
1299 shost_printk(KERN_ERR, target->scsi_host,
1300 PFX "Recv failed with error code %d\n", res);
1301 }
1302
1303 static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
1304 struct srp_target_port *target)
1305 {
1306 if (target->connected && !target->qp_in_error) {
1307 shost_printk(KERN_ERR, target->scsi_host,
1308 PFX "failed %s status %d\n",
1309 send_err ? "send" : "receive",
1310 wc_status);
1311 }
1312 target->qp_in_error = true;
1313 }
1314
1315 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1316 {
1317 struct srp_target_port *target = target_ptr;
1318 struct ib_wc wc;
1319
1320 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1321 while (ib_poll_cq(cq, 1, &wc) > 0) {
1322 if (likely(wc.status == IB_WC_SUCCESS)) {
1323 srp_handle_recv(target, &wc);
1324 } else {
1325 srp_handle_qp_err(wc.status, false, target);
1326 }
1327 }
1328 }
1329
1330 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1331 {
1332 struct srp_target_port *target = target_ptr;
1333 struct ib_wc wc;
1334 struct srp_iu *iu;
1335
1336 while (ib_poll_cq(cq, 1, &wc) > 0) {
1337 if (likely(wc.status == IB_WC_SUCCESS)) {
1338 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1339 list_add(&iu->list, &target->free_tx);
1340 } else {
1341 srp_handle_qp_err(wc.status, true, target);
1342 }
1343 }
1344 }
1345
1346 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1347 {
1348 struct srp_target_port *target = host_to_target(shost);
1349 struct srp_request *req;
1350 struct srp_iu *iu;
1351 struct srp_cmd *cmd;
1352 struct ib_device *dev;
1353 unsigned long flags;
1354 int len;
1355
1356 if (unlikely(target->transport_offline)) {
1357 scmnd->result = DID_NO_CONNECT << 16;
1358 scmnd->scsi_done(scmnd);
1359 return 0;
1360 }
1361
1362 spin_lock_irqsave(&target->lock, flags);
1363 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1364 if (!iu)
1365 goto err_unlock;
1366
1367 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1368 list_del(&req->list);
1369 spin_unlock_irqrestore(&target->lock, flags);
1370
1371 dev = target->srp_host->srp_dev->dev;
1372 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
1373 DMA_TO_DEVICE);
1374
1375 scmnd->result = 0;
1376 scmnd->host_scribble = (void *) req;
1377
1378 cmd = iu->buf;
1379 memset(cmd, 0, sizeof *cmd);
1380
1381 cmd->opcode = SRP_CMD;
1382 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1383 cmd->tag = req->index;
1384 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1385
1386 req->scmnd = scmnd;
1387 req->cmd = iu;
1388
1389 len = srp_map_data(scmnd, target, req);
1390 if (len < 0) {
1391 shost_printk(KERN_ERR, target->scsi_host,
1392 PFX "Failed to map data\n");
1393 goto err_iu;
1394 }
1395
1396 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
1397 DMA_TO_DEVICE);
1398
1399 if (srp_post_send(target, iu, len)) {
1400 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1401 goto err_unmap;
1402 }
1403
1404 return 0;
1405
1406 err_unmap:
1407 srp_unmap_data(scmnd, target, req);
1408
1409 err_iu:
1410 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1411
1412 /*
1413 * Avoid that the loops that iterate over the request ring can
1414 * encounter a dangling SCSI command pointer.
1415 */
1416 req->scmnd = NULL;
1417
1418 spin_lock_irqsave(&target->lock, flags);
1419 list_add(&req->list, &target->free_reqs);
1420
1421 err_unlock:
1422 spin_unlock_irqrestore(&target->lock, flags);
1423
1424 return SCSI_MLQUEUE_HOST_BUSY;
1425 }
1426
1427 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1428 {
1429 int i;
1430
1431 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1432 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1433 target->max_ti_iu_len,
1434 GFP_KERNEL, DMA_FROM_DEVICE);
1435 if (!target->rx_ring[i])
1436 goto err;
1437 }
1438
1439 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1440 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1441 target->max_iu_len,
1442 GFP_KERNEL, DMA_TO_DEVICE);
1443 if (!target->tx_ring[i])
1444 goto err;
1445
1446 list_add(&target->tx_ring[i]->list, &target->free_tx);
1447 }
1448
1449 return 0;
1450
1451 err:
1452 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1453 srp_free_iu(target->srp_host, target->rx_ring[i]);
1454 target->rx_ring[i] = NULL;
1455 }
1456
1457 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1458 srp_free_iu(target->srp_host, target->tx_ring[i]);
1459 target->tx_ring[i] = NULL;
1460 }
1461
1462 return -ENOMEM;
1463 }
1464
1465 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1466 {
1467 uint64_t T_tr_ns, max_compl_time_ms;
1468 uint32_t rq_tmo_jiffies;
1469
1470 /*
1471 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1472 * table 91), both the QP timeout and the retry count have to be set
1473 * for RC QP's during the RTR to RTS transition.
1474 */
1475 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1476 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1477
1478 /*
1479 * Set target->rq_tmo_jiffies to one second more than the largest time
1480 * it can take before an error completion is generated. See also
1481 * C9-140..142 in the IBTA spec for more information about how to
1482 * convert the QP Local ACK Timeout value to nanoseconds.
1483 */
1484 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1485 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1486 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1487 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1488
1489 return rq_tmo_jiffies;
1490 }
1491
1492 static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1493 struct srp_login_rsp *lrsp,
1494 struct srp_target_port *target)
1495 {
1496 struct ib_qp_attr *qp_attr = NULL;
1497 int attr_mask = 0;
1498 int ret;
1499 int i;
1500
1501 if (lrsp->opcode == SRP_LOGIN_RSP) {
1502 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1503 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1504
1505 /*
1506 * Reserve credits for task management so we don't
1507 * bounce requests back to the SCSI mid-layer.
1508 */
1509 target->scsi_host->can_queue
1510 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1511 target->scsi_host->can_queue);
1512 } else {
1513 shost_printk(KERN_WARNING, target->scsi_host,
1514 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1515 ret = -ECONNRESET;
1516 goto error;
1517 }
1518
1519 if (!target->rx_ring[0]) {
1520 ret = srp_alloc_iu_bufs(target);
1521 if (ret)
1522 goto error;
1523 }
1524
1525 ret = -ENOMEM;
1526 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1527 if (!qp_attr)
1528 goto error;
1529
1530 qp_attr->qp_state = IB_QPS_RTR;
1531 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1532 if (ret)
1533 goto error_free;
1534
1535 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1536 if (ret)
1537 goto error_free;
1538
1539 for (i = 0; i < SRP_RQ_SIZE; i++) {
1540 struct srp_iu *iu = target->rx_ring[i];
1541 ret = srp_post_recv(target, iu);
1542 if (ret)
1543 goto error_free;
1544 }
1545
1546 qp_attr->qp_state = IB_QPS_RTS;
1547 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1548 if (ret)
1549 goto error_free;
1550
1551 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1552
1553 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1554 if (ret)
1555 goto error_free;
1556
1557 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1558
1559 error_free:
1560 kfree(qp_attr);
1561
1562 error:
1563 target->status = ret;
1564 }
1565
1566 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1567 struct ib_cm_event *event,
1568 struct srp_target_port *target)
1569 {
1570 struct Scsi_Host *shost = target->scsi_host;
1571 struct ib_class_port_info *cpi;
1572 int opcode;
1573
1574 switch (event->param.rej_rcvd.reason) {
1575 case IB_CM_REJ_PORT_CM_REDIRECT:
1576 cpi = event->param.rej_rcvd.ari;
1577 target->path.dlid = cpi->redirect_lid;
1578 target->path.pkey = cpi->redirect_pkey;
1579 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1580 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1581
1582 target->status = target->path.dlid ?
1583 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1584 break;
1585
1586 case IB_CM_REJ_PORT_REDIRECT:
1587 if (srp_target_is_topspin(target)) {
1588 /*
1589 * Topspin/Cisco SRP gateways incorrectly send
1590 * reject reason code 25 when they mean 24
1591 * (port redirect).
1592 */
1593 memcpy(target->path.dgid.raw,
1594 event->param.rej_rcvd.ari, 16);
1595
1596 shost_printk(KERN_DEBUG, shost,
1597 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1598 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1599 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1600
1601 target->status = SRP_PORT_REDIRECT;
1602 } else {
1603 shost_printk(KERN_WARNING, shost,
1604 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1605 target->status = -ECONNRESET;
1606 }
1607 break;
1608
1609 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1610 shost_printk(KERN_WARNING, shost,
1611 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1612 target->status = -ECONNRESET;
1613 break;
1614
1615 case IB_CM_REJ_CONSUMER_DEFINED:
1616 opcode = *(u8 *) event->private_data;
1617 if (opcode == SRP_LOGIN_REJ) {
1618 struct srp_login_rej *rej = event->private_data;
1619 u32 reason = be32_to_cpu(rej->reason);
1620
1621 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1622 shost_printk(KERN_WARNING, shost,
1623 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1624 else
1625 shost_printk(KERN_WARNING, shost,
1626 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1627 } else
1628 shost_printk(KERN_WARNING, shost,
1629 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1630 " opcode 0x%02x\n", opcode);
1631 target->status = -ECONNRESET;
1632 break;
1633
1634 case IB_CM_REJ_STALE_CONN:
1635 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1636 target->status = SRP_STALE_CONN;
1637 break;
1638
1639 default:
1640 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1641 event->param.rej_rcvd.reason);
1642 target->status = -ECONNRESET;
1643 }
1644 }
1645
1646 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1647 {
1648 struct srp_target_port *target = cm_id->context;
1649 int comp = 0;
1650
1651 switch (event->event) {
1652 case IB_CM_REQ_ERROR:
1653 shost_printk(KERN_DEBUG, target->scsi_host,
1654 PFX "Sending CM REQ failed\n");
1655 comp = 1;
1656 target->status = -ECONNRESET;
1657 break;
1658
1659 case IB_CM_REP_RECEIVED:
1660 comp = 1;
1661 srp_cm_rep_handler(cm_id, event->private_data, target);
1662 break;
1663
1664 case IB_CM_REJ_RECEIVED:
1665 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1666 comp = 1;
1667
1668 srp_cm_rej_handler(cm_id, event, target);
1669 break;
1670
1671 case IB_CM_DREQ_RECEIVED:
1672 shost_printk(KERN_WARNING, target->scsi_host,
1673 PFX "DREQ received - connection closed\n");
1674 srp_change_conn_state(target, false);
1675 if (ib_send_cm_drep(cm_id, NULL, 0))
1676 shost_printk(KERN_ERR, target->scsi_host,
1677 PFX "Sending CM DREP failed\n");
1678 break;
1679
1680 case IB_CM_TIMEWAIT_EXIT:
1681 shost_printk(KERN_ERR, target->scsi_host,
1682 PFX "connection closed\n");
1683
1684 target->status = 0;
1685 break;
1686
1687 case IB_CM_MRA_RECEIVED:
1688 case IB_CM_DREQ_ERROR:
1689 case IB_CM_DREP_RECEIVED:
1690 break;
1691
1692 default:
1693 shost_printk(KERN_WARNING, target->scsi_host,
1694 PFX "Unhandled CM event %d\n", event->event);
1695 break;
1696 }
1697
1698 if (comp)
1699 complete(&target->done);
1700
1701 return 0;
1702 }
1703
1704 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1705 u64 req_tag, unsigned int lun, u8 func)
1706 {
1707 struct ib_device *dev = target->srp_host->srp_dev->dev;
1708 struct srp_iu *iu;
1709 struct srp_tsk_mgmt *tsk_mgmt;
1710
1711 if (!target->connected || target->qp_in_error)
1712 return -1;
1713
1714 init_completion(&target->tsk_mgmt_done);
1715
1716 spin_lock_irq(&target->lock);
1717 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1718 spin_unlock_irq(&target->lock);
1719
1720 if (!iu)
1721 return -1;
1722
1723 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1724 DMA_TO_DEVICE);
1725 tsk_mgmt = iu->buf;
1726 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1727
1728 tsk_mgmt->opcode = SRP_TSK_MGMT;
1729 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1730 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
1731 tsk_mgmt->tsk_mgmt_func = func;
1732 tsk_mgmt->task_tag = req_tag;
1733
1734 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1735 DMA_TO_DEVICE);
1736 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
1737 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
1738 return -1;
1739 }
1740
1741 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
1742 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1743 return -1;
1744
1745 return 0;
1746 }
1747
1748 static int srp_abort(struct scsi_cmnd *scmnd)
1749 {
1750 struct srp_target_port *target = host_to_target(scmnd->device->host);
1751 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
1752
1753 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1754
1755 if (!req || !srp_claim_req(target, req, scmnd))
1756 return FAILED;
1757 srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
1758 SRP_TSK_ABORT_TASK);
1759 srp_free_req(target, req, scmnd, 0);
1760 scmnd->result = DID_ABORT << 16;
1761 scmnd->scsi_done(scmnd);
1762
1763 return SUCCESS;
1764 }
1765
1766 static int srp_reset_device(struct scsi_cmnd *scmnd)
1767 {
1768 struct srp_target_port *target = host_to_target(scmnd->device->host);
1769 int i;
1770
1771 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1772
1773 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
1774 SRP_TSK_LUN_RESET))
1775 return FAILED;
1776 if (target->tsk_mgmt_status)
1777 return FAILED;
1778
1779 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1780 struct srp_request *req = &target->req_ring[i];
1781 if (req->scmnd && req->scmnd->device == scmnd->device)
1782 srp_reset_req(target, req);
1783 }
1784
1785 return SUCCESS;
1786 }
1787
1788 static int srp_reset_host(struct scsi_cmnd *scmnd)
1789 {
1790 struct srp_target_port *target = host_to_target(scmnd->device->host);
1791 int ret = FAILED;
1792
1793 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1794
1795 if (!srp_reconnect_target(target))
1796 ret = SUCCESS;
1797
1798 return ret;
1799 }
1800
1801 static int srp_slave_configure(struct scsi_device *sdev)
1802 {
1803 struct Scsi_Host *shost = sdev->host;
1804 struct srp_target_port *target = host_to_target(shost);
1805 struct request_queue *q = sdev->request_queue;
1806 unsigned long timeout;
1807
1808 if (sdev->type == TYPE_DISK) {
1809 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
1810 blk_queue_rq_timeout(q, timeout);
1811 }
1812
1813 return 0;
1814 }
1815
1816 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1817 char *buf)
1818 {
1819 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1820
1821 return sprintf(buf, "0x%016llx\n",
1822 (unsigned long long) be64_to_cpu(target->id_ext));
1823 }
1824
1825 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1826 char *buf)
1827 {
1828 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1829
1830 return sprintf(buf, "0x%016llx\n",
1831 (unsigned long long) be64_to_cpu(target->ioc_guid));
1832 }
1833
1834 static ssize_t show_service_id(struct device *dev,
1835 struct device_attribute *attr, char *buf)
1836 {
1837 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1838
1839 return sprintf(buf, "0x%016llx\n",
1840 (unsigned long long) be64_to_cpu(target->service_id));
1841 }
1842
1843 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1844 char *buf)
1845 {
1846 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1847
1848 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1849 }
1850
1851 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1852 char *buf)
1853 {
1854 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1855
1856 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1857 }
1858
1859 static ssize_t show_orig_dgid(struct device *dev,
1860 struct device_attribute *attr, char *buf)
1861 {
1862 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1863
1864 return sprintf(buf, "%pI6\n", target->orig_dgid);
1865 }
1866
1867 static ssize_t show_req_lim(struct device *dev,
1868 struct device_attribute *attr, char *buf)
1869 {
1870 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1871
1872 return sprintf(buf, "%d\n", target->req_lim);
1873 }
1874
1875 static ssize_t show_zero_req_lim(struct device *dev,
1876 struct device_attribute *attr, char *buf)
1877 {
1878 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1879
1880 return sprintf(buf, "%d\n", target->zero_req_lim);
1881 }
1882
1883 static ssize_t show_local_ib_port(struct device *dev,
1884 struct device_attribute *attr, char *buf)
1885 {
1886 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1887
1888 return sprintf(buf, "%d\n", target->srp_host->port);
1889 }
1890
1891 static ssize_t show_local_ib_device(struct device *dev,
1892 struct device_attribute *attr, char *buf)
1893 {
1894 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1895
1896 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1897 }
1898
1899 static ssize_t show_cmd_sg_entries(struct device *dev,
1900 struct device_attribute *attr, char *buf)
1901 {
1902 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1903
1904 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
1905 }
1906
1907 static ssize_t show_allow_ext_sg(struct device *dev,
1908 struct device_attribute *attr, char *buf)
1909 {
1910 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1911
1912 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
1913 }
1914
1915 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1916 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1917 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1918 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1919 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1920 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1921 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
1922 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1923 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1924 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1925 static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
1926 static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
1927
1928 static struct device_attribute *srp_host_attrs[] = {
1929 &dev_attr_id_ext,
1930 &dev_attr_ioc_guid,
1931 &dev_attr_service_id,
1932 &dev_attr_pkey,
1933 &dev_attr_dgid,
1934 &dev_attr_orig_dgid,
1935 &dev_attr_req_lim,
1936 &dev_attr_zero_req_lim,
1937 &dev_attr_local_ib_port,
1938 &dev_attr_local_ib_device,
1939 &dev_attr_cmd_sg_entries,
1940 &dev_attr_allow_ext_sg,
1941 NULL
1942 };
1943
1944 static struct scsi_host_template srp_template = {
1945 .module = THIS_MODULE,
1946 .name = "InfiniBand SRP initiator",
1947 .proc_name = DRV_NAME,
1948 .slave_configure = srp_slave_configure,
1949 .info = srp_target_info,
1950 .queuecommand = srp_queuecommand,
1951 .eh_abort_handler = srp_abort,
1952 .eh_device_reset_handler = srp_reset_device,
1953 .eh_host_reset_handler = srp_reset_host,
1954 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
1955 .can_queue = SRP_CMD_SQ_SIZE,
1956 .this_id = -1,
1957 .cmd_per_lun = SRP_CMD_SQ_SIZE,
1958 .use_clustering = ENABLE_CLUSTERING,
1959 .shost_attrs = srp_host_attrs
1960 };
1961
1962 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1963 {
1964 struct srp_rport_identifiers ids;
1965 struct srp_rport *rport;
1966
1967 sprintf(target->target_name, "SRP.T10:%016llX",
1968 (unsigned long long) be64_to_cpu(target->id_ext));
1969
1970 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1971 return -ENODEV;
1972
1973 memcpy(ids.port_id, &target->id_ext, 8);
1974 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1975 ids.roles = SRP_RPORT_ROLE_TARGET;
1976 rport = srp_rport_add(target->scsi_host, &ids);
1977 if (IS_ERR(rport)) {
1978 scsi_remove_host(target->scsi_host);
1979 return PTR_ERR(rport);
1980 }
1981
1982 rport->lld_data = target;
1983
1984 spin_lock(&host->target_lock);
1985 list_add_tail(&target->list, &host->target_list);
1986 spin_unlock(&host->target_lock);
1987
1988 target->state = SRP_TARGET_LIVE;
1989
1990 scsi_scan_target(&target->scsi_host->shost_gendev,
1991 0, target->scsi_id, SCAN_WILD_CARD, 0);
1992
1993 return 0;
1994 }
1995
1996 static void srp_release_dev(struct device *dev)
1997 {
1998 struct srp_host *host =
1999 container_of(dev, struct srp_host, dev);
2000
2001 complete(&host->released);
2002 }
2003
2004 static struct class srp_class = {
2005 .name = "infiniband_srp",
2006 .dev_release = srp_release_dev
2007 };
2008
2009 /*
2010 * Target ports are added by writing
2011 *
2012 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2013 * pkey=<P_Key>,service_id=<service ID>
2014 *
2015 * to the add_target sysfs attribute.
2016 */
2017 enum {
2018 SRP_OPT_ERR = 0,
2019 SRP_OPT_ID_EXT = 1 << 0,
2020 SRP_OPT_IOC_GUID = 1 << 1,
2021 SRP_OPT_DGID = 1 << 2,
2022 SRP_OPT_PKEY = 1 << 3,
2023 SRP_OPT_SERVICE_ID = 1 << 4,
2024 SRP_OPT_MAX_SECT = 1 << 5,
2025 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
2026 SRP_OPT_IO_CLASS = 1 << 7,
2027 SRP_OPT_INITIATOR_EXT = 1 << 8,
2028 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
2029 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2030 SRP_OPT_SG_TABLESIZE = 1 << 11,
2031 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2032 SRP_OPT_IOC_GUID |
2033 SRP_OPT_DGID |
2034 SRP_OPT_PKEY |
2035 SRP_OPT_SERVICE_ID),
2036 };
2037
2038 static const match_table_t srp_opt_tokens = {
2039 { SRP_OPT_ID_EXT, "id_ext=%s" },
2040 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2041 { SRP_OPT_DGID, "dgid=%s" },
2042 { SRP_OPT_PKEY, "pkey=%x" },
2043 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2044 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2045 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
2046 { SRP_OPT_IO_CLASS, "io_class=%x" },
2047 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
2048 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
2049 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2050 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
2051 { SRP_OPT_ERR, NULL }
2052 };
2053
2054 static int srp_parse_options(const char *buf, struct srp_target_port *target)
2055 {
2056 char *options, *sep_opt;
2057 char *p;
2058 char dgid[3];
2059 substring_t args[MAX_OPT_ARGS];
2060 int opt_mask = 0;
2061 int token;
2062 int ret = -EINVAL;
2063 int i;
2064
2065 options = kstrdup(buf, GFP_KERNEL);
2066 if (!options)
2067 return -ENOMEM;
2068
2069 sep_opt = options;
2070 while ((p = strsep(&sep_opt, ",")) != NULL) {
2071 if (!*p)
2072 continue;
2073
2074 token = match_token(p, srp_opt_tokens, args);
2075 opt_mask |= token;
2076
2077 switch (token) {
2078 case SRP_OPT_ID_EXT:
2079 p = match_strdup(args);
2080 if (!p) {
2081 ret = -ENOMEM;
2082 goto out;
2083 }
2084 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2085 kfree(p);
2086 break;
2087
2088 case SRP_OPT_IOC_GUID:
2089 p = match_strdup(args);
2090 if (!p) {
2091 ret = -ENOMEM;
2092 goto out;
2093 }
2094 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2095 kfree(p);
2096 break;
2097
2098 case SRP_OPT_DGID:
2099 p = match_strdup(args);
2100 if (!p) {
2101 ret = -ENOMEM;
2102 goto out;
2103 }
2104 if (strlen(p) != 32) {
2105 pr_warn("bad dest GID parameter '%s'\n", p);
2106 kfree(p);
2107 goto out;
2108 }
2109
2110 for (i = 0; i < 16; ++i) {
2111 strlcpy(dgid, p + i * 2, 3);
2112 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2113 }
2114 kfree(p);
2115 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
2116 break;
2117
2118 case SRP_OPT_PKEY:
2119 if (match_hex(args, &token)) {
2120 pr_warn("bad P_Key parameter '%s'\n", p);
2121 goto out;
2122 }
2123 target->path.pkey = cpu_to_be16(token);
2124 break;
2125
2126 case SRP_OPT_SERVICE_ID:
2127 p = match_strdup(args);
2128 if (!p) {
2129 ret = -ENOMEM;
2130 goto out;
2131 }
2132 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2133 target->path.service_id = target->service_id;
2134 kfree(p);
2135 break;
2136
2137 case SRP_OPT_MAX_SECT:
2138 if (match_int(args, &token)) {
2139 pr_warn("bad max sect parameter '%s'\n", p);
2140 goto out;
2141 }
2142 target->scsi_host->max_sectors = token;
2143 break;
2144
2145 case SRP_OPT_MAX_CMD_PER_LUN:
2146 if (match_int(args, &token)) {
2147 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2148 p);
2149 goto out;
2150 }
2151 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
2152 break;
2153
2154 case SRP_OPT_IO_CLASS:
2155 if (match_hex(args, &token)) {
2156 pr_warn("bad IO class parameter '%s'\n", p);
2157 goto out;
2158 }
2159 if (token != SRP_REV10_IB_IO_CLASS &&
2160 token != SRP_REV16A_IB_IO_CLASS) {
2161 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2162 token, SRP_REV10_IB_IO_CLASS,
2163 SRP_REV16A_IB_IO_CLASS);
2164 goto out;
2165 }
2166 target->io_class = token;
2167 break;
2168
2169 case SRP_OPT_INITIATOR_EXT:
2170 p = match_strdup(args);
2171 if (!p) {
2172 ret = -ENOMEM;
2173 goto out;
2174 }
2175 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2176 kfree(p);
2177 break;
2178
2179 case SRP_OPT_CMD_SG_ENTRIES:
2180 if (match_int(args, &token) || token < 1 || token > 255) {
2181 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2182 p);
2183 goto out;
2184 }
2185 target->cmd_sg_cnt = token;
2186 break;
2187
2188 case SRP_OPT_ALLOW_EXT_SG:
2189 if (match_int(args, &token)) {
2190 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
2191 goto out;
2192 }
2193 target->allow_ext_sg = !!token;
2194 break;
2195
2196 case SRP_OPT_SG_TABLESIZE:
2197 if (match_int(args, &token) || token < 1 ||
2198 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
2199 pr_warn("bad max sg_tablesize parameter '%s'\n",
2200 p);
2201 goto out;
2202 }
2203 target->sg_tablesize = token;
2204 break;
2205
2206 default:
2207 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2208 p);
2209 goto out;
2210 }
2211 }
2212
2213 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2214 ret = 0;
2215 else
2216 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2217 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2218 !(srp_opt_tokens[i].token & opt_mask))
2219 pr_warn("target creation request is missing parameter '%s'\n",
2220 srp_opt_tokens[i].pattern);
2221
2222 out:
2223 kfree(options);
2224 return ret;
2225 }
2226
2227 static ssize_t srp_create_target(struct device *dev,
2228 struct device_attribute *attr,
2229 const char *buf, size_t count)
2230 {
2231 struct srp_host *host =
2232 container_of(dev, struct srp_host, dev);
2233 struct Scsi_Host *target_host;
2234 struct srp_target_port *target;
2235 struct ib_device *ibdev = host->srp_dev->dev;
2236 dma_addr_t dma_addr;
2237 int i, ret;
2238
2239 target_host = scsi_host_alloc(&srp_template,
2240 sizeof (struct srp_target_port));
2241 if (!target_host)
2242 return -ENOMEM;
2243
2244 target_host->transportt = ib_srp_transport_template;
2245 target_host->max_channel = 0;
2246 target_host->max_id = 1;
2247 target_host->max_lun = SRP_MAX_LUN;
2248 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
2249
2250 target = host_to_target(target_host);
2251
2252 target->io_class = SRP_REV16A_IB_IO_CLASS;
2253 target->scsi_host = target_host;
2254 target->srp_host = host;
2255 target->lkey = host->srp_dev->mr->lkey;
2256 target->rkey = host->srp_dev->mr->rkey;
2257 target->cmd_sg_cnt = cmd_sg_entries;
2258 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2259 target->allow_ext_sg = allow_ext_sg;
2260
2261 ret = srp_parse_options(buf, target);
2262 if (ret)
2263 goto err;
2264
2265 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2266 target->cmd_sg_cnt < target->sg_tablesize) {
2267 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
2268 target->sg_tablesize = target->cmd_sg_cnt;
2269 }
2270
2271 target_host->sg_tablesize = target->sg_tablesize;
2272 target->indirect_size = target->sg_tablesize *
2273 sizeof (struct srp_direct_buf);
2274 target->max_iu_len = sizeof (struct srp_cmd) +
2275 sizeof (struct srp_indirect_buf) +
2276 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2277
2278 INIT_WORK(&target->remove_work, srp_remove_work);
2279 spin_lock_init(&target->lock);
2280 INIT_LIST_HEAD(&target->free_tx);
2281 INIT_LIST_HEAD(&target->free_reqs);
2282 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
2283 struct srp_request *req = &target->req_ring[i];
2284
2285 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *),
2286 GFP_KERNEL);
2287 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *),
2288 GFP_KERNEL);
2289 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
2290 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
2291 goto err_free_mem;
2292
2293 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
2294 target->indirect_size,
2295 DMA_TO_DEVICE);
2296 if (ib_dma_mapping_error(ibdev, dma_addr))
2297 goto err_free_mem;
2298
2299 req->indirect_dma_addr = dma_addr;
2300 req->index = i;
2301 list_add_tail(&req->list, &target->free_reqs);
2302 }
2303
2304 ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2305
2306 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2307 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
2308 "service_id %016llx dgid %pI6\n",
2309 (unsigned long long) be64_to_cpu(target->id_ext),
2310 (unsigned long long) be64_to_cpu(target->ioc_guid),
2311 be16_to_cpu(target->path.pkey),
2312 (unsigned long long) be64_to_cpu(target->service_id),
2313 target->path.dgid.raw);
2314
2315 ret = srp_create_target_ib(target);
2316 if (ret)
2317 goto err_free_mem;
2318
2319 ret = srp_new_cm_id(target);
2320 if (ret)
2321 goto err_free_ib;
2322
2323 ret = srp_connect_target(target);
2324 if (ret) {
2325 shost_printk(KERN_ERR, target->scsi_host,
2326 PFX "Connection failed\n");
2327 goto err_cm_id;
2328 }
2329
2330 ret = srp_add_target(host, target);
2331 if (ret)
2332 goto err_disconnect;
2333
2334 return count;
2335
2336 err_disconnect:
2337 srp_disconnect_target(target);
2338
2339 err_cm_id:
2340 ib_destroy_cm_id(target->cm_id);
2341
2342 err_free_ib:
2343 srp_free_target_ib(target);
2344
2345 err_free_mem:
2346 srp_free_req_data(target);
2347
2348 err:
2349 scsi_host_put(target_host);
2350
2351 return ret;
2352 }
2353
2354 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2355
2356 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2357 char *buf)
2358 {
2359 struct srp_host *host = container_of(dev, struct srp_host, dev);
2360
2361 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2362 }
2363
2364 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2365
2366 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2367 char *buf)
2368 {
2369 struct srp_host *host = container_of(dev, struct srp_host, dev);
2370
2371 return sprintf(buf, "%d\n", host->port);
2372 }
2373
2374 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2375
2376 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2377 {
2378 struct srp_host *host;
2379
2380 host = kzalloc(sizeof *host, GFP_KERNEL);
2381 if (!host)
2382 return NULL;
2383
2384 INIT_LIST_HEAD(&host->target_list);
2385 spin_lock_init(&host->target_lock);
2386 init_completion(&host->released);
2387 host->srp_dev = device;
2388 host->port = port;
2389
2390 host->dev.class = &srp_class;
2391 host->dev.parent = device->dev->dma_device;
2392 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2393
2394 if (device_register(&host->dev))
2395 goto free_host;
2396 if (device_create_file(&host->dev, &dev_attr_add_target))
2397 goto err_class;
2398 if (device_create_file(&host->dev, &dev_attr_ibdev))
2399 goto err_class;
2400 if (device_create_file(&host->dev, &dev_attr_port))
2401 goto err_class;
2402
2403 return host;
2404
2405 err_class:
2406 device_unregister(&host->dev);
2407
2408 free_host:
2409 kfree(host);
2410
2411 return NULL;
2412 }
2413
2414 static void srp_add_one(struct ib_device *device)
2415 {
2416 struct srp_device *srp_dev;
2417 struct ib_device_attr *dev_attr;
2418 struct ib_fmr_pool_param fmr_param;
2419 struct srp_host *host;
2420 int max_pages_per_fmr, fmr_page_shift, s, e, p;
2421
2422 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2423 if (!dev_attr)
2424 return;
2425
2426 if (ib_query_device(device, dev_attr)) {
2427 pr_warn("Query device failed for %s\n", device->name);
2428 goto free_attr;
2429 }
2430
2431 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2432 if (!srp_dev)
2433 goto free_attr;
2434
2435 /*
2436 * Use the smallest page size supported by the HCA, down to a
2437 * minimum of 4096 bytes. We're unlikely to build large sglists
2438 * out of smaller entries.
2439 */
2440 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2441 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2442 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2443 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
2444
2445 INIT_LIST_HEAD(&srp_dev->dev_list);
2446
2447 srp_dev->dev = device;
2448 srp_dev->pd = ib_alloc_pd(device);
2449 if (IS_ERR(srp_dev->pd))
2450 goto free_dev;
2451
2452 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2453 IB_ACCESS_LOCAL_WRITE |
2454 IB_ACCESS_REMOTE_READ |
2455 IB_ACCESS_REMOTE_WRITE);
2456 if (IS_ERR(srp_dev->mr))
2457 goto err_pd;
2458
2459 for (max_pages_per_fmr = SRP_FMR_SIZE;
2460 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2461 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2462 memset(&fmr_param, 0, sizeof fmr_param);
2463 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2464 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2465 fmr_param.cache = 1;
2466 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2467 fmr_param.page_shift = fmr_page_shift;
2468 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2469 IB_ACCESS_REMOTE_WRITE |
2470 IB_ACCESS_REMOTE_READ);
2471
2472 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2473 if (!IS_ERR(srp_dev->fmr_pool))
2474 break;
2475 }
2476
2477 if (IS_ERR(srp_dev->fmr_pool))
2478 srp_dev->fmr_pool = NULL;
2479
2480 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2481 s = 0;
2482 e = 0;
2483 } else {
2484 s = 1;
2485 e = device->phys_port_cnt;
2486 }
2487
2488 for (p = s; p <= e; ++p) {
2489 host = srp_add_port(srp_dev, p);
2490 if (host)
2491 list_add_tail(&host->list, &srp_dev->dev_list);
2492 }
2493
2494 ib_set_client_data(device, &srp_client, srp_dev);
2495
2496 goto free_attr;
2497
2498 err_pd:
2499 ib_dealloc_pd(srp_dev->pd);
2500
2501 free_dev:
2502 kfree(srp_dev);
2503
2504 free_attr:
2505 kfree(dev_attr);
2506 }
2507
2508 static void srp_remove_one(struct ib_device *device)
2509 {
2510 struct srp_device *srp_dev;
2511 struct srp_host *host, *tmp_host;
2512 struct srp_target_port *target;
2513
2514 srp_dev = ib_get_client_data(device, &srp_client);
2515
2516 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2517 device_unregister(&host->dev);
2518 /*
2519 * Wait for the sysfs entry to go away, so that no new
2520 * target ports can be created.
2521 */
2522 wait_for_completion(&host->released);
2523
2524 /*
2525 * Remove all target ports.
2526 */
2527 spin_lock(&host->target_lock);
2528 list_for_each_entry(target, &host->target_list, list)
2529 srp_queue_remove_work(target);
2530 spin_unlock(&host->target_lock);
2531
2532 /*
2533 * Wait for target port removal tasks.
2534 */
2535 flush_workqueue(system_long_wq);
2536
2537 kfree(host);
2538 }
2539
2540 if (srp_dev->fmr_pool)
2541 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2542 ib_dereg_mr(srp_dev->mr);
2543 ib_dealloc_pd(srp_dev->pd);
2544
2545 kfree(srp_dev);
2546 }
2547
2548 static struct srp_function_template ib_srp_transport_functions = {
2549 .rport_delete = srp_rport_delete,
2550 };
2551
2552 static int __init srp_init_module(void)
2553 {
2554 int ret;
2555
2556 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2557
2558 if (srp_sg_tablesize) {
2559 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
2560 if (!cmd_sg_entries)
2561 cmd_sg_entries = srp_sg_tablesize;
2562 }
2563
2564 if (!cmd_sg_entries)
2565 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2566
2567 if (cmd_sg_entries > 255) {
2568 pr_warn("Clamping cmd_sg_entries to 255\n");
2569 cmd_sg_entries = 255;
2570 }
2571
2572 if (!indirect_sg_entries)
2573 indirect_sg_entries = cmd_sg_entries;
2574 else if (indirect_sg_entries < cmd_sg_entries) {
2575 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2576 cmd_sg_entries);
2577 indirect_sg_entries = cmd_sg_entries;
2578 }
2579
2580 ib_srp_transport_template =
2581 srp_attach_transport(&ib_srp_transport_functions);
2582 if (!ib_srp_transport_template)
2583 return -ENOMEM;
2584
2585 ret = class_register(&srp_class);
2586 if (ret) {
2587 pr_err("couldn't register class infiniband_srp\n");
2588 srp_release_transport(ib_srp_transport_template);
2589 return ret;
2590 }
2591
2592 ib_sa_register_client(&srp_sa_client);
2593
2594 ret = ib_register_client(&srp_client);
2595 if (ret) {
2596 pr_err("couldn't register IB client\n");
2597 srp_release_transport(ib_srp_transport_template);
2598 ib_sa_unregister_client(&srp_sa_client);
2599 class_unregister(&srp_class);
2600 return ret;
2601 }
2602
2603 return 0;
2604 }
2605
2606 static void __exit srp_cleanup_module(void)
2607 {
2608 ib_unregister_client(&srp_client);
2609 ib_sa_unregister_client(&srp_sa_client);
2610 class_unregister(&srp_class);
2611 srp_release_transport(ib_srp_transport_template);
2612 }
2613
2614 module_init(srp_init_module);
2615 module_exit(srp_cleanup_module);
kernel source for telekom puls (alcatel/mediatek)