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66a908bf3fb9e1d43654d07af1d346cca12a6223
[deliverable/linux.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/scsi_tcq.h>
50 #include <scsi/srp.h>
51 #include <scsi/scsi_transport_srp.h>
52
53 #include "ib_srp.h"
54
55 #define DRV_NAME "ib_srp"
56 #define PFX DRV_NAME ": "
57 #define DRV_VERSION "1.0"
58 #define DRV_RELDATE "July 1, 2013"
59
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63 MODULE_LICENSE("Dual BSD/GPL");
64
65 static unsigned int srp_sg_tablesize;
66 static unsigned int cmd_sg_entries;
67 static unsigned int indirect_sg_entries;
68 static bool allow_ext_sg;
69 static int topspin_workarounds = 1;
70
71 module_param(srp_sg_tablesize, uint, 0444);
72 MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
73
74 module_param(cmd_sg_entries, uint, 0444);
75 MODULE_PARM_DESC(cmd_sg_entries,
76 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
77
78 module_param(indirect_sg_entries, uint, 0444);
79 MODULE_PARM_DESC(indirect_sg_entries,
80 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
81
82 module_param(allow_ext_sg, bool, 0444);
83 MODULE_PARM_DESC(allow_ext_sg,
84 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
85
86 module_param(topspin_workarounds, int, 0444);
87 MODULE_PARM_DESC(topspin_workarounds,
88 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
89
90 static struct kernel_param_ops srp_tmo_ops;
91
92 static int srp_reconnect_delay = 10;
93 module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
94 S_IRUGO | S_IWUSR);
95 MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
96
97 static int srp_fast_io_fail_tmo = 15;
98 module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
99 S_IRUGO | S_IWUSR);
100 MODULE_PARM_DESC(fast_io_fail_tmo,
101 "Number of seconds between the observation of a transport"
102 " layer error and failing all I/O. \"off\" means that this"
103 " functionality is disabled.");
104
105 static int srp_dev_loss_tmo = 600;
106 module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
107 S_IRUGO | S_IWUSR);
108 MODULE_PARM_DESC(dev_loss_tmo,
109 "Maximum number of seconds that the SRP transport should"
110 " insulate transport layer errors. After this time has been"
111 " exceeded the SCSI host is removed. Should be"
112 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
113 " if fast_io_fail_tmo has not been set. \"off\" means that"
114 " this functionality is disabled.");
115
116 static void srp_add_one(struct ib_device *device);
117 static void srp_remove_one(struct ib_device *device);
118 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
119 static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
120 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
121
122 static struct scsi_transport_template *ib_srp_transport_template;
123
124 static struct ib_client srp_client = {
125 .name = "srp",
126 .add = srp_add_one,
127 .remove = srp_remove_one
128 };
129
130 static struct ib_sa_client srp_sa_client;
131
132 static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
133 {
134 int tmo = *(int *)kp->arg;
135
136 if (tmo >= 0)
137 return sprintf(buffer, "%d", tmo);
138 else
139 return sprintf(buffer, "off");
140 }
141
142 static int srp_tmo_set(const char *val, const struct kernel_param *kp)
143 {
144 int tmo, res;
145
146 if (strncmp(val, "off", 3) != 0) {
147 res = kstrtoint(val, 0, &tmo);
148 if (res)
149 goto out;
150 } else {
151 tmo = -1;
152 }
153 if (kp->arg == &srp_reconnect_delay)
154 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
155 srp_dev_loss_tmo);
156 else if (kp->arg == &srp_fast_io_fail_tmo)
157 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
158 else
159 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
160 tmo);
161 if (res)
162 goto out;
163 *(int *)kp->arg = tmo;
164
165 out:
166 return res;
167 }
168
169 static struct kernel_param_ops srp_tmo_ops = {
170 .get = srp_tmo_get,
171 .set = srp_tmo_set,
172 };
173
174 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
175 {
176 return (struct srp_target_port *) host->hostdata;
177 }
178
179 static const char *srp_target_info(struct Scsi_Host *host)
180 {
181 return host_to_target(host)->target_name;
182 }
183
184 static int srp_target_is_topspin(struct srp_target_port *target)
185 {
186 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
187 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
188
189 return topspin_workarounds &&
190 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
191 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
192 }
193
194 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
195 gfp_t gfp_mask,
196 enum dma_data_direction direction)
197 {
198 struct srp_iu *iu;
199
200 iu = kmalloc(sizeof *iu, gfp_mask);
201 if (!iu)
202 goto out;
203
204 iu->buf = kzalloc(size, gfp_mask);
205 if (!iu->buf)
206 goto out_free_iu;
207
208 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
209 direction);
210 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
211 goto out_free_buf;
212
213 iu->size = size;
214 iu->direction = direction;
215
216 return iu;
217
218 out_free_buf:
219 kfree(iu->buf);
220 out_free_iu:
221 kfree(iu);
222 out:
223 return NULL;
224 }
225
226 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
227 {
228 if (!iu)
229 return;
230
231 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
232 iu->direction);
233 kfree(iu->buf);
234 kfree(iu);
235 }
236
237 static void srp_qp_event(struct ib_event *event, void *context)
238 {
239 pr_debug("QP event %d\n", event->event);
240 }
241
242 static int srp_init_qp(struct srp_target_port *target,
243 struct ib_qp *qp)
244 {
245 struct ib_qp_attr *attr;
246 int ret;
247
248 attr = kmalloc(sizeof *attr, GFP_KERNEL);
249 if (!attr)
250 return -ENOMEM;
251
252 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
253 target->srp_host->port,
254 be16_to_cpu(target->path.pkey),
255 &attr->pkey_index);
256 if (ret)
257 goto out;
258
259 attr->qp_state = IB_QPS_INIT;
260 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
261 IB_ACCESS_REMOTE_WRITE);
262 attr->port_num = target->srp_host->port;
263
264 ret = ib_modify_qp(qp, attr,
265 IB_QP_STATE |
266 IB_QP_PKEY_INDEX |
267 IB_QP_ACCESS_FLAGS |
268 IB_QP_PORT);
269
270 out:
271 kfree(attr);
272 return ret;
273 }
274
275 static int srp_new_cm_id(struct srp_target_port *target)
276 {
277 struct ib_cm_id *new_cm_id;
278
279 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
280 srp_cm_handler, target);
281 if (IS_ERR(new_cm_id))
282 return PTR_ERR(new_cm_id);
283
284 if (target->cm_id)
285 ib_destroy_cm_id(target->cm_id);
286 target->cm_id = new_cm_id;
287
288 return 0;
289 }
290
291 static int srp_create_target_ib(struct srp_target_port *target)
292 {
293 struct ib_qp_init_attr *init_attr;
294 struct ib_cq *recv_cq, *send_cq;
295 struct ib_qp *qp;
296 int ret;
297
298 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
299 if (!init_attr)
300 return -ENOMEM;
301
302 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
303 srp_recv_completion, NULL, target,
304 target->queue_size, target->comp_vector);
305 if (IS_ERR(recv_cq)) {
306 ret = PTR_ERR(recv_cq);
307 goto err;
308 }
309
310 send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
311 srp_send_completion, NULL, target,
312 target->queue_size, target->comp_vector);
313 if (IS_ERR(send_cq)) {
314 ret = PTR_ERR(send_cq);
315 goto err_recv_cq;
316 }
317
318 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
319
320 init_attr->event_handler = srp_qp_event;
321 init_attr->cap.max_send_wr = target->queue_size;
322 init_attr->cap.max_recv_wr = target->queue_size;
323 init_attr->cap.max_recv_sge = 1;
324 init_attr->cap.max_send_sge = 1;
325 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
326 init_attr->qp_type = IB_QPT_RC;
327 init_attr->send_cq = send_cq;
328 init_attr->recv_cq = recv_cq;
329
330 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
331 if (IS_ERR(qp)) {
332 ret = PTR_ERR(qp);
333 goto err_send_cq;
334 }
335
336 ret = srp_init_qp(target, qp);
337 if (ret)
338 goto err_qp;
339
340 if (target->qp)
341 ib_destroy_qp(target->qp);
342 if (target->recv_cq)
343 ib_destroy_cq(target->recv_cq);
344 if (target->send_cq)
345 ib_destroy_cq(target->send_cq);
346
347 target->qp = qp;
348 target->recv_cq = recv_cq;
349 target->send_cq = send_cq;
350
351 kfree(init_attr);
352 return 0;
353
354 err_qp:
355 ib_destroy_qp(qp);
356
357 err_send_cq:
358 ib_destroy_cq(send_cq);
359
360 err_recv_cq:
361 ib_destroy_cq(recv_cq);
362
363 err:
364 kfree(init_attr);
365 return ret;
366 }
367
368 /*
369 * Note: this function may be called without srp_alloc_iu_bufs() having been
370 * invoked. Hence the target->[rt]x_ring checks.
371 */
372 static void srp_free_target_ib(struct srp_target_port *target)
373 {
374 int i;
375
376 ib_destroy_qp(target->qp);
377 ib_destroy_cq(target->send_cq);
378 ib_destroy_cq(target->recv_cq);
379
380 target->qp = NULL;
381 target->send_cq = target->recv_cq = NULL;
382
383 if (target->rx_ring) {
384 for (i = 0; i < target->queue_size; ++i)
385 srp_free_iu(target->srp_host, target->rx_ring[i]);
386 kfree(target->rx_ring);
387 target->rx_ring = NULL;
388 }
389 if (target->tx_ring) {
390 for (i = 0; i < target->queue_size; ++i)
391 srp_free_iu(target->srp_host, target->tx_ring[i]);
392 kfree(target->tx_ring);
393 target->tx_ring = NULL;
394 }
395 }
396
397 static void srp_path_rec_completion(int status,
398 struct ib_sa_path_rec *pathrec,
399 void *target_ptr)
400 {
401 struct srp_target_port *target = target_ptr;
402
403 target->status = status;
404 if (status)
405 shost_printk(KERN_ERR, target->scsi_host,
406 PFX "Got failed path rec status %d\n", status);
407 else
408 target->path = *pathrec;
409 complete(&target->done);
410 }
411
412 static int srp_lookup_path(struct srp_target_port *target)
413 {
414 int ret;
415
416 target->path.numb_path = 1;
417
418 init_completion(&target->done);
419
420 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
421 target->srp_host->srp_dev->dev,
422 target->srp_host->port,
423 &target->path,
424 IB_SA_PATH_REC_SERVICE_ID |
425 IB_SA_PATH_REC_DGID |
426 IB_SA_PATH_REC_SGID |
427 IB_SA_PATH_REC_NUMB_PATH |
428 IB_SA_PATH_REC_PKEY,
429 SRP_PATH_REC_TIMEOUT_MS,
430 GFP_KERNEL,
431 srp_path_rec_completion,
432 target, &target->path_query);
433 if (target->path_query_id < 0)
434 return target->path_query_id;
435
436 ret = wait_for_completion_interruptible(&target->done);
437 if (ret < 0)
438 return ret;
439
440 if (target->status < 0)
441 shost_printk(KERN_WARNING, target->scsi_host,
442 PFX "Path record query failed\n");
443
444 return target->status;
445 }
446
447 static int srp_send_req(struct srp_target_port *target)
448 {
449 struct {
450 struct ib_cm_req_param param;
451 struct srp_login_req priv;
452 } *req = NULL;
453 int status;
454
455 req = kzalloc(sizeof *req, GFP_KERNEL);
456 if (!req)
457 return -ENOMEM;
458
459 req->param.primary_path = &target->path;
460 req->param.alternate_path = NULL;
461 req->param.service_id = target->service_id;
462 req->param.qp_num = target->qp->qp_num;
463 req->param.qp_type = target->qp->qp_type;
464 req->param.private_data = &req->priv;
465 req->param.private_data_len = sizeof req->priv;
466 req->param.flow_control = 1;
467
468 get_random_bytes(&req->param.starting_psn, 4);
469 req->param.starting_psn &= 0xffffff;
470
471 /*
472 * Pick some arbitrary defaults here; we could make these
473 * module parameters if anyone cared about setting them.
474 */
475 req->param.responder_resources = 4;
476 req->param.remote_cm_response_timeout = 20;
477 req->param.local_cm_response_timeout = 20;
478 req->param.retry_count = target->tl_retry_count;
479 req->param.rnr_retry_count = 7;
480 req->param.max_cm_retries = 15;
481
482 req->priv.opcode = SRP_LOGIN_REQ;
483 req->priv.tag = 0;
484 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
485 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
486 SRP_BUF_FORMAT_INDIRECT);
487 /*
488 * In the published SRP specification (draft rev. 16a), the
489 * port identifier format is 8 bytes of ID extension followed
490 * by 8 bytes of GUID. Older drafts put the two halves in the
491 * opposite order, so that the GUID comes first.
492 *
493 * Targets conforming to these obsolete drafts can be
494 * recognized by the I/O Class they report.
495 */
496 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
497 memcpy(req->priv.initiator_port_id,
498 &target->path.sgid.global.interface_id, 8);
499 memcpy(req->priv.initiator_port_id + 8,
500 &target->initiator_ext, 8);
501 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
502 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
503 } else {
504 memcpy(req->priv.initiator_port_id,
505 &target->initiator_ext, 8);
506 memcpy(req->priv.initiator_port_id + 8,
507 &target->path.sgid.global.interface_id, 8);
508 memcpy(req->priv.target_port_id, &target->id_ext, 8);
509 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
510 }
511
512 /*
513 * Topspin/Cisco SRP targets will reject our login unless we
514 * zero out the first 8 bytes of our initiator port ID and set
515 * the second 8 bytes to the local node GUID.
516 */
517 if (srp_target_is_topspin(target)) {
518 shost_printk(KERN_DEBUG, target->scsi_host,
519 PFX "Topspin/Cisco initiator port ID workaround "
520 "activated for target GUID %016llx\n",
521 (unsigned long long) be64_to_cpu(target->ioc_guid));
522 memset(req->priv.initiator_port_id, 0, 8);
523 memcpy(req->priv.initiator_port_id + 8,
524 &target->srp_host->srp_dev->dev->node_guid, 8);
525 }
526
527 status = ib_send_cm_req(target->cm_id, &req->param);
528
529 kfree(req);
530
531 return status;
532 }
533
534 static bool srp_queue_remove_work(struct srp_target_port *target)
535 {
536 bool changed = false;
537
538 spin_lock_irq(&target->lock);
539 if (target->state != SRP_TARGET_REMOVED) {
540 target->state = SRP_TARGET_REMOVED;
541 changed = true;
542 }
543 spin_unlock_irq(&target->lock);
544
545 if (changed)
546 queue_work(system_long_wq, &target->remove_work);
547
548 return changed;
549 }
550
551 static bool srp_change_conn_state(struct srp_target_port *target,
552 bool connected)
553 {
554 bool changed = false;
555
556 spin_lock_irq(&target->lock);
557 if (target->connected != connected) {
558 target->connected = connected;
559 changed = true;
560 }
561 spin_unlock_irq(&target->lock);
562
563 return changed;
564 }
565
566 static void srp_disconnect_target(struct srp_target_port *target)
567 {
568 if (srp_change_conn_state(target, false)) {
569 /* XXX should send SRP_I_LOGOUT request */
570
571 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
572 shost_printk(KERN_DEBUG, target->scsi_host,
573 PFX "Sending CM DREQ failed\n");
574 }
575 }
576 }
577
578 static void srp_free_req_data(struct srp_target_port *target)
579 {
580 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
581 struct srp_request *req;
582 int i;
583
584 if (!target->req_ring)
585 return;
586
587 for (i = 0; i < target->req_ring_size; ++i) {
588 req = &target->req_ring[i];
589 kfree(req->fmr_list);
590 kfree(req->map_page);
591 if (req->indirect_dma_addr) {
592 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
593 target->indirect_size,
594 DMA_TO_DEVICE);
595 }
596 kfree(req->indirect_desc);
597 }
598
599 kfree(target->req_ring);
600 target->req_ring = NULL;
601 }
602
603 static int srp_alloc_req_data(struct srp_target_port *target)
604 {
605 struct srp_device *srp_dev = target->srp_host->srp_dev;
606 struct ib_device *ibdev = srp_dev->dev;
607 struct srp_request *req;
608 dma_addr_t dma_addr;
609 int i, ret = -ENOMEM;
610
611 INIT_LIST_HEAD(&target->free_reqs);
612
613 target->req_ring = kzalloc(target->req_ring_size *
614 sizeof(*target->req_ring), GFP_KERNEL);
615 if (!target->req_ring)
616 goto out;
617
618 for (i = 0; i < target->req_ring_size; ++i) {
619 req = &target->req_ring[i];
620 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
621 GFP_KERNEL);
622 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof(void *),
623 GFP_KERNEL);
624 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
625 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
626 goto out;
627
628 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
629 target->indirect_size,
630 DMA_TO_DEVICE);
631 if (ib_dma_mapping_error(ibdev, dma_addr))
632 goto out;
633
634 req->indirect_dma_addr = dma_addr;
635 req->index = i;
636 list_add_tail(&req->list, &target->free_reqs);
637 }
638 ret = 0;
639
640 out:
641 return ret;
642 }
643
644 /**
645 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
646 * @shost: SCSI host whose attributes to remove from sysfs.
647 *
648 * Note: Any attributes defined in the host template and that did not exist
649 * before invocation of this function will be ignored.
650 */
651 static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
652 {
653 struct device_attribute **attr;
654
655 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
656 device_remove_file(&shost->shost_dev, *attr);
657 }
658
659 static void srp_remove_target(struct srp_target_port *target)
660 {
661 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
662
663 srp_del_scsi_host_attr(target->scsi_host);
664 srp_rport_get(target->rport);
665 srp_remove_host(target->scsi_host);
666 scsi_remove_host(target->scsi_host);
667 srp_stop_rport_timers(target->rport);
668 srp_disconnect_target(target);
669 ib_destroy_cm_id(target->cm_id);
670 srp_free_target_ib(target);
671 cancel_work_sync(&target->tl_err_work);
672 srp_rport_put(target->rport);
673 srp_free_req_data(target);
674
675 spin_lock(&target->srp_host->target_lock);
676 list_del(&target->list);
677 spin_unlock(&target->srp_host->target_lock);
678
679 scsi_host_put(target->scsi_host);
680 }
681
682 static void srp_remove_work(struct work_struct *work)
683 {
684 struct srp_target_port *target =
685 container_of(work, struct srp_target_port, remove_work);
686
687 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
688
689 srp_remove_target(target);
690 }
691
692 static void srp_rport_delete(struct srp_rport *rport)
693 {
694 struct srp_target_port *target = rport->lld_data;
695
696 srp_queue_remove_work(target);
697 }
698
699 static int srp_connect_target(struct srp_target_port *target)
700 {
701 int retries = 3;
702 int ret;
703
704 WARN_ON_ONCE(target->connected);
705
706 target->qp_in_error = false;
707
708 ret = srp_lookup_path(target);
709 if (ret)
710 return ret;
711
712 while (1) {
713 init_completion(&target->done);
714 ret = srp_send_req(target);
715 if (ret)
716 return ret;
717 ret = wait_for_completion_interruptible(&target->done);
718 if (ret < 0)
719 return ret;
720
721 /*
722 * The CM event handling code will set status to
723 * SRP_PORT_REDIRECT if we get a port redirect REJ
724 * back, or SRP_DLID_REDIRECT if we get a lid/qp
725 * redirect REJ back.
726 */
727 switch (target->status) {
728 case 0:
729 srp_change_conn_state(target, true);
730 return 0;
731
732 case SRP_PORT_REDIRECT:
733 ret = srp_lookup_path(target);
734 if (ret)
735 return ret;
736 break;
737
738 case SRP_DLID_REDIRECT:
739 break;
740
741 case SRP_STALE_CONN:
742 /* Our current CM id was stale, and is now in timewait.
743 * Try to reconnect with a new one.
744 */
745 if (!retries-- || srp_new_cm_id(target)) {
746 shost_printk(KERN_ERR, target->scsi_host, PFX
747 "giving up on stale connection\n");
748 target->status = -ECONNRESET;
749 return target->status;
750 }
751
752 shost_printk(KERN_ERR, target->scsi_host, PFX
753 "retrying stale connection\n");
754 break;
755
756 default:
757 return target->status;
758 }
759 }
760 }
761
762 static void srp_unmap_data(struct scsi_cmnd *scmnd,
763 struct srp_target_port *target,
764 struct srp_request *req)
765 {
766 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
767 struct ib_pool_fmr **pfmr;
768
769 if (!scsi_sglist(scmnd) ||
770 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
771 scmnd->sc_data_direction != DMA_FROM_DEVICE))
772 return;
773
774 pfmr = req->fmr_list;
775 while (req->nfmr--)
776 ib_fmr_pool_unmap(*pfmr++);
777
778 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
779 scmnd->sc_data_direction);
780 }
781
782 /**
783 * srp_claim_req - Take ownership of the scmnd associated with a request.
784 * @target: SRP target port.
785 * @req: SRP request.
786 * @sdev: If not NULL, only take ownership for this SCSI device.
787 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
788 * ownership of @req->scmnd if it equals @scmnd.
789 *
790 * Return value:
791 * Either NULL or a pointer to the SCSI command the caller became owner of.
792 */
793 static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
794 struct srp_request *req,
795 struct scsi_device *sdev,
796 struct scsi_cmnd *scmnd)
797 {
798 unsigned long flags;
799
800 spin_lock_irqsave(&target->lock, flags);
801 if (req->scmnd &&
802 (!sdev || req->scmnd->device == sdev) &&
803 (!scmnd || req->scmnd == scmnd)) {
804 scmnd = req->scmnd;
805 req->scmnd = NULL;
806 } else {
807 scmnd = NULL;
808 }
809 spin_unlock_irqrestore(&target->lock, flags);
810
811 return scmnd;
812 }
813
814 /**
815 * srp_free_req() - Unmap data and add request to the free request list.
816 */
817 static void srp_free_req(struct srp_target_port *target,
818 struct srp_request *req, struct scsi_cmnd *scmnd,
819 s32 req_lim_delta)
820 {
821 unsigned long flags;
822
823 srp_unmap_data(scmnd, target, req);
824
825 spin_lock_irqsave(&target->lock, flags);
826 target->req_lim += req_lim_delta;
827 list_add_tail(&req->list, &target->free_reqs);
828 spin_unlock_irqrestore(&target->lock, flags);
829 }
830
831 static void srp_finish_req(struct srp_target_port *target,
832 struct srp_request *req, struct scsi_device *sdev,
833 int result)
834 {
835 struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
836
837 if (scmnd) {
838 srp_free_req(target, req, scmnd, 0);
839 scmnd->result = result;
840 scmnd->scsi_done(scmnd);
841 }
842 }
843
844 static void srp_terminate_io(struct srp_rport *rport)
845 {
846 struct srp_target_port *target = rport->lld_data;
847 struct Scsi_Host *shost = target->scsi_host;
848 struct scsi_device *sdev;
849 int i;
850
851 /*
852 * Invoking srp_terminate_io() while srp_queuecommand() is running
853 * is not safe. Hence the warning statement below.
854 */
855 shost_for_each_device(sdev, shost)
856 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
857
858 for (i = 0; i < target->req_ring_size; ++i) {
859 struct srp_request *req = &target->req_ring[i];
860 srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
861 }
862 }
863
864 /*
865 * It is up to the caller to ensure that srp_rport_reconnect() calls are
866 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
867 * srp_reset_device() or srp_reset_host() calls will occur while this function
868 * is in progress. One way to realize that is not to call this function
869 * directly but to call srp_reconnect_rport() instead since that last function
870 * serializes calls of this function via rport->mutex and also blocks
871 * srp_queuecommand() calls before invoking this function.
872 */
873 static int srp_rport_reconnect(struct srp_rport *rport)
874 {
875 struct srp_target_port *target = rport->lld_data;
876 int i, ret;
877
878 srp_disconnect_target(target);
879 /*
880 * Now get a new local CM ID so that we avoid confusing the target in
881 * case things are really fouled up. Doing so also ensures that all CM
882 * callbacks will have finished before a new QP is allocated.
883 */
884 ret = srp_new_cm_id(target);
885 /*
886 * Whether or not creating a new CM ID succeeded, create a new
887 * QP. This guarantees that all completion callback function
888 * invocations have finished before request resetting starts.
889 */
890 if (ret == 0)
891 ret = srp_create_target_ib(target);
892 else
893 srp_create_target_ib(target);
894
895 for (i = 0; i < target->req_ring_size; ++i) {
896 struct srp_request *req = &target->req_ring[i];
897 srp_finish_req(target, req, NULL, DID_RESET << 16);
898 }
899
900 INIT_LIST_HEAD(&target->free_tx);
901 for (i = 0; i < target->queue_size; ++i)
902 list_add(&target->tx_ring[i]->list, &target->free_tx);
903
904 if (ret == 0)
905 ret = srp_connect_target(target);
906
907 if (ret == 0)
908 shost_printk(KERN_INFO, target->scsi_host,
909 PFX "reconnect succeeded\n");
910
911 return ret;
912 }
913
914 static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
915 unsigned int dma_len, u32 rkey)
916 {
917 struct srp_direct_buf *desc = state->desc;
918
919 desc->va = cpu_to_be64(dma_addr);
920 desc->key = cpu_to_be32(rkey);
921 desc->len = cpu_to_be32(dma_len);
922
923 state->total_len += dma_len;
924 state->desc++;
925 state->ndesc++;
926 }
927
928 static int srp_map_finish_fmr(struct srp_map_state *state,
929 struct srp_target_port *target)
930 {
931 struct srp_device *dev = target->srp_host->srp_dev;
932 struct ib_pool_fmr *fmr;
933 u64 io_addr = 0;
934
935 if (!state->npages)
936 return 0;
937
938 if (state->npages == 1) {
939 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
940 target->rkey);
941 state->npages = state->fmr_len = 0;
942 return 0;
943 }
944
945 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
946 state->npages, io_addr);
947 if (IS_ERR(fmr))
948 return PTR_ERR(fmr);
949
950 *state->next_fmr++ = fmr;
951 state->nfmr++;
952
953 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
954 state->npages = state->fmr_len = 0;
955 return 0;
956 }
957
958 static void srp_map_update_start(struct srp_map_state *state,
959 struct scatterlist *sg, int sg_index,
960 dma_addr_t dma_addr)
961 {
962 state->unmapped_sg = sg;
963 state->unmapped_index = sg_index;
964 state->unmapped_addr = dma_addr;
965 }
966
967 static int srp_map_sg_entry(struct srp_map_state *state,
968 struct srp_target_port *target,
969 struct scatterlist *sg, int sg_index,
970 int use_fmr)
971 {
972 struct srp_device *dev = target->srp_host->srp_dev;
973 struct ib_device *ibdev = dev->dev;
974 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
975 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
976 unsigned int len;
977 int ret;
978
979 if (!dma_len)
980 return 0;
981
982 if (use_fmr == SRP_MAP_NO_FMR) {
983 /* Once we're in direct map mode for a request, we don't
984 * go back to FMR mode, so no need to update anything
985 * other than the descriptor.
986 */
987 srp_map_desc(state, dma_addr, dma_len, target->rkey);
988 return 0;
989 }
990
991 /* If we start at an offset into the FMR page, don't merge into
992 * the current FMR. Finish it out, and use the kernel's MR for this
993 * sg entry. This is to avoid potential bugs on some SRP targets
994 * that were never quite defined, but went away when the initiator
995 * avoided using FMR on such page fragments.
996 */
997 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
998 ret = srp_map_finish_fmr(state, target);
999 if (ret)
1000 return ret;
1001
1002 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1003 srp_map_update_start(state, NULL, 0, 0);
1004 return 0;
1005 }
1006
1007 /* If this is the first sg to go into the FMR, save our position.
1008 * We need to know the first unmapped entry, its index, and the
1009 * first unmapped address within that entry to be able to restart
1010 * mapping after an error.
1011 */
1012 if (!state->unmapped_sg)
1013 srp_map_update_start(state, sg, sg_index, dma_addr);
1014
1015 while (dma_len) {
1016 if (state->npages == SRP_FMR_SIZE) {
1017 ret = srp_map_finish_fmr(state, target);
1018 if (ret)
1019 return ret;
1020
1021 srp_map_update_start(state, sg, sg_index, dma_addr);
1022 }
1023
1024 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
1025
1026 if (!state->npages)
1027 state->base_dma_addr = dma_addr;
1028 state->pages[state->npages++] = dma_addr;
1029 state->fmr_len += len;
1030 dma_addr += len;
1031 dma_len -= len;
1032 }
1033
1034 /* If the last entry of the FMR wasn't a full page, then we need to
1035 * close it out and start a new one -- we can only merge at page
1036 * boundries.
1037 */
1038 ret = 0;
1039 if (len != dev->fmr_page_size) {
1040 ret = srp_map_finish_fmr(state, target);
1041 if (!ret)
1042 srp_map_update_start(state, NULL, 0, 0);
1043 }
1044 return ret;
1045 }
1046
1047 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1048 struct srp_request *req)
1049 {
1050 struct scatterlist *scat, *sg;
1051 struct srp_cmd *cmd = req->cmd->buf;
1052 int i, len, nents, count, use_fmr;
1053 struct srp_device *dev;
1054 struct ib_device *ibdev;
1055 struct srp_map_state state;
1056 struct srp_indirect_buf *indirect_hdr;
1057 u32 table_len;
1058 u8 fmt;
1059
1060 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
1061 return sizeof (struct srp_cmd);
1062
1063 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1064 scmnd->sc_data_direction != DMA_TO_DEVICE) {
1065 shost_printk(KERN_WARNING, target->scsi_host,
1066 PFX "Unhandled data direction %d\n",
1067 scmnd->sc_data_direction);
1068 return -EINVAL;
1069 }
1070
1071 nents = scsi_sg_count(scmnd);
1072 scat = scsi_sglist(scmnd);
1073
1074 dev = target->srp_host->srp_dev;
1075 ibdev = dev->dev;
1076
1077 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
1078 if (unlikely(count == 0))
1079 return -EIO;
1080
1081 fmt = SRP_DATA_DESC_DIRECT;
1082 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
1083
1084 if (count == 1) {
1085 /*
1086 * The midlayer only generated a single gather/scatter
1087 * entry, or DMA mapping coalesced everything to a
1088 * single entry. So a direct descriptor along with
1089 * the DMA MR suffices.
1090 */
1091 struct srp_direct_buf *buf = (void *) cmd->add_data;
1092
1093 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
1094 buf->key = cpu_to_be32(target->rkey);
1095 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
1096
1097 req->nfmr = 0;
1098 goto map_complete;
1099 }
1100
1101 /* We have more than one scatter/gather entry, so build our indirect
1102 * descriptor table, trying to merge as many entries with FMR as we
1103 * can.
1104 */
1105 indirect_hdr = (void *) cmd->add_data;
1106
1107 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1108 target->indirect_size, DMA_TO_DEVICE);
1109
1110 memset(&state, 0, sizeof(state));
1111 state.desc = req->indirect_desc;
1112 state.pages = req->map_page;
1113 state.next_fmr = req->fmr_list;
1114
1115 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
1116
1117 for_each_sg(scat, sg, count, i) {
1118 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
1119 /* FMR mapping failed, so backtrack to the first
1120 * unmapped entry and continue on without using FMR.
1121 */
1122 dma_addr_t dma_addr;
1123 unsigned int dma_len;
1124
1125 backtrack:
1126 sg = state.unmapped_sg;
1127 i = state.unmapped_index;
1128
1129 dma_addr = ib_sg_dma_address(ibdev, sg);
1130 dma_len = ib_sg_dma_len(ibdev, sg);
1131 dma_len -= (state.unmapped_addr - dma_addr);
1132 dma_addr = state.unmapped_addr;
1133 use_fmr = SRP_MAP_NO_FMR;
1134 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
1135 }
1136 }
1137
1138 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
1139 goto backtrack;
1140
1141 /* We've mapped the request, now pull as much of the indirect
1142 * descriptor table as we can into the command buffer. If this
1143 * target is not using an external indirect table, we are
1144 * guaranteed to fit into the command, as the SCSI layer won't
1145 * give us more S/G entries than we allow.
1146 */
1147 req->nfmr = state.nfmr;
1148 if (state.ndesc == 1) {
1149 /* FMR mapping was able to collapse this to one entry,
1150 * so use a direct descriptor.
1151 */
1152 struct srp_direct_buf *buf = (void *) cmd->add_data;
1153
1154 *buf = req->indirect_desc[0];
1155 goto map_complete;
1156 }
1157
1158 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1159 !target->allow_ext_sg)) {
1160 shost_printk(KERN_ERR, target->scsi_host,
1161 "Could not fit S/G list into SRP_CMD\n");
1162 return -EIO;
1163 }
1164
1165 count = min(state.ndesc, target->cmd_sg_cnt);
1166 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1167
1168 fmt = SRP_DATA_DESC_INDIRECT;
1169 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
1170 len += count * sizeof (struct srp_direct_buf);
1171
1172 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1173 count * sizeof (struct srp_direct_buf));
1174
1175 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1176 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1177 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1178 indirect_hdr->len = cpu_to_be32(state.total_len);
1179
1180 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1181 cmd->data_out_desc_cnt = count;
1182 else
1183 cmd->data_in_desc_cnt = count;
1184
1185 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1186 DMA_TO_DEVICE);
1187
1188 map_complete:
1189 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1190 cmd->buf_fmt = fmt << 4;
1191 else
1192 cmd->buf_fmt = fmt;
1193
1194 return len;
1195 }
1196
1197 /*
1198 * Return an IU and possible credit to the free pool
1199 */
1200 static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1201 enum srp_iu_type iu_type)
1202 {
1203 unsigned long flags;
1204
1205 spin_lock_irqsave(&target->lock, flags);
1206 list_add(&iu->list, &target->free_tx);
1207 if (iu_type != SRP_IU_RSP)
1208 ++target->req_lim;
1209 spin_unlock_irqrestore(&target->lock, flags);
1210 }
1211
1212 /*
1213 * Must be called with target->lock held to protect req_lim and free_tx.
1214 * If IU is not sent, it must be returned using srp_put_tx_iu().
1215 *
1216 * Note:
1217 * An upper limit for the number of allocated information units for each
1218 * request type is:
1219 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1220 * more than Scsi_Host.can_queue requests.
1221 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1222 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1223 * one unanswered SRP request to an initiator.
1224 */
1225 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1226 enum srp_iu_type iu_type)
1227 {
1228 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1229 struct srp_iu *iu;
1230
1231 srp_send_completion(target->send_cq, target);
1232
1233 if (list_empty(&target->free_tx))
1234 return NULL;
1235
1236 /* Initiator responses to target requests do not consume credits */
1237 if (iu_type != SRP_IU_RSP) {
1238 if (target->req_lim <= rsv) {
1239 ++target->zero_req_lim;
1240 return NULL;
1241 }
1242
1243 --target->req_lim;
1244 }
1245
1246 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
1247 list_del(&iu->list);
1248 return iu;
1249 }
1250
1251 static int srp_post_send(struct srp_target_port *target,
1252 struct srp_iu *iu, int len)
1253 {
1254 struct ib_sge list;
1255 struct ib_send_wr wr, *bad_wr;
1256
1257 list.addr = iu->dma;
1258 list.length = len;
1259 list.lkey = target->lkey;
1260
1261 wr.next = NULL;
1262 wr.wr_id = (uintptr_t) iu;
1263 wr.sg_list = &list;
1264 wr.num_sge = 1;
1265 wr.opcode = IB_WR_SEND;
1266 wr.send_flags = IB_SEND_SIGNALED;
1267
1268 return ib_post_send(target->qp, &wr, &bad_wr);
1269 }
1270
1271 static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
1272 {
1273 struct ib_recv_wr wr, *bad_wr;
1274 struct ib_sge list;
1275
1276 list.addr = iu->dma;
1277 list.length = iu->size;
1278 list.lkey = target->lkey;
1279
1280 wr.next = NULL;
1281 wr.wr_id = (uintptr_t) iu;
1282 wr.sg_list = &list;
1283 wr.num_sge = 1;
1284
1285 return ib_post_recv(target->qp, &wr, &bad_wr);
1286 }
1287
1288 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1289 {
1290 struct srp_request *req;
1291 struct scsi_cmnd *scmnd;
1292 unsigned long flags;
1293
1294 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
1295 spin_lock_irqsave(&target->lock, flags);
1296 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1297 spin_unlock_irqrestore(&target->lock, flags);
1298
1299 target->tsk_mgmt_status = -1;
1300 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1301 target->tsk_mgmt_status = rsp->data[3];
1302 complete(&target->tsk_mgmt_done);
1303 } else {
1304 req = &target->req_ring[rsp->tag];
1305 scmnd = srp_claim_req(target, req, NULL, NULL);
1306 if (!scmnd) {
1307 shost_printk(KERN_ERR, target->scsi_host,
1308 "Null scmnd for RSP w/tag %016llx\n",
1309 (unsigned long long) rsp->tag);
1310
1311 spin_lock_irqsave(&target->lock, flags);
1312 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1313 spin_unlock_irqrestore(&target->lock, flags);
1314
1315 return;
1316 }
1317 scmnd->result = rsp->status;
1318
1319 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1320 memcpy(scmnd->sense_buffer, rsp->data +
1321 be32_to_cpu(rsp->resp_data_len),
1322 min_t(int, be32_to_cpu(rsp->sense_data_len),
1323 SCSI_SENSE_BUFFERSIZE));
1324 }
1325
1326 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
1327 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1328 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
1329 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
1330
1331 srp_free_req(target, req, scmnd,
1332 be32_to_cpu(rsp->req_lim_delta));
1333
1334 scmnd->host_scribble = NULL;
1335 scmnd->scsi_done(scmnd);
1336 }
1337 }
1338
1339 static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1340 void *rsp, int len)
1341 {
1342 struct ib_device *dev = target->srp_host->srp_dev->dev;
1343 unsigned long flags;
1344 struct srp_iu *iu;
1345 int err;
1346
1347 spin_lock_irqsave(&target->lock, flags);
1348 target->req_lim += req_delta;
1349 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
1350 spin_unlock_irqrestore(&target->lock, flags);
1351
1352 if (!iu) {
1353 shost_printk(KERN_ERR, target->scsi_host, PFX
1354 "no IU available to send response\n");
1355 return 1;
1356 }
1357
1358 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1359 memcpy(iu->buf, rsp, len);
1360 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1361
1362 err = srp_post_send(target, iu, len);
1363 if (err) {
1364 shost_printk(KERN_ERR, target->scsi_host, PFX
1365 "unable to post response: %d\n", err);
1366 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1367 }
1368
1369 return err;
1370 }
1371
1372 static void srp_process_cred_req(struct srp_target_port *target,
1373 struct srp_cred_req *req)
1374 {
1375 struct srp_cred_rsp rsp = {
1376 .opcode = SRP_CRED_RSP,
1377 .tag = req->tag,
1378 };
1379 s32 delta = be32_to_cpu(req->req_lim_delta);
1380
1381 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1382 shost_printk(KERN_ERR, target->scsi_host, PFX
1383 "problems processing SRP_CRED_REQ\n");
1384 }
1385
1386 static void srp_process_aer_req(struct srp_target_port *target,
1387 struct srp_aer_req *req)
1388 {
1389 struct srp_aer_rsp rsp = {
1390 .opcode = SRP_AER_RSP,
1391 .tag = req->tag,
1392 };
1393 s32 delta = be32_to_cpu(req->req_lim_delta);
1394
1395 shost_printk(KERN_ERR, target->scsi_host, PFX
1396 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1397
1398 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1399 shost_printk(KERN_ERR, target->scsi_host, PFX
1400 "problems processing SRP_AER_REQ\n");
1401 }
1402
1403 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1404 {
1405 struct ib_device *dev = target->srp_host->srp_dev->dev;
1406 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
1407 int res;
1408 u8 opcode;
1409
1410 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1411 DMA_FROM_DEVICE);
1412
1413 opcode = *(u8 *) iu->buf;
1414
1415 if (0) {
1416 shost_printk(KERN_ERR, target->scsi_host,
1417 PFX "recv completion, opcode 0x%02x\n", opcode);
1418 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1419 iu->buf, wc->byte_len, true);
1420 }
1421
1422 switch (opcode) {
1423 case SRP_RSP:
1424 srp_process_rsp(target, iu->buf);
1425 break;
1426
1427 case SRP_CRED_REQ:
1428 srp_process_cred_req(target, iu->buf);
1429 break;
1430
1431 case SRP_AER_REQ:
1432 srp_process_aer_req(target, iu->buf);
1433 break;
1434
1435 case SRP_T_LOGOUT:
1436 /* XXX Handle target logout */
1437 shost_printk(KERN_WARNING, target->scsi_host,
1438 PFX "Got target logout request\n");
1439 break;
1440
1441 default:
1442 shost_printk(KERN_WARNING, target->scsi_host,
1443 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1444 break;
1445 }
1446
1447 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1448 DMA_FROM_DEVICE);
1449
1450 res = srp_post_recv(target, iu);
1451 if (res != 0)
1452 shost_printk(KERN_ERR, target->scsi_host,
1453 PFX "Recv failed with error code %d\n", res);
1454 }
1455
1456 /**
1457 * srp_tl_err_work() - handle a transport layer error
1458 *
1459 * Note: This function may get invoked before the rport has been created,
1460 * hence the target->rport test.
1461 */
1462 static void srp_tl_err_work(struct work_struct *work)
1463 {
1464 struct srp_target_port *target;
1465
1466 target = container_of(work, struct srp_target_port, tl_err_work);
1467 if (target->rport)
1468 srp_start_tl_fail_timers(target->rport);
1469 }
1470
1471 static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
1472 struct srp_target_port *target)
1473 {
1474 if (target->connected && !target->qp_in_error) {
1475 shost_printk(KERN_ERR, target->scsi_host,
1476 PFX "failed %s status %d\n",
1477 send_err ? "send" : "receive",
1478 wc_status);
1479 queue_work(system_long_wq, &target->tl_err_work);
1480 }
1481 target->qp_in_error = true;
1482 }
1483
1484 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1485 {
1486 struct srp_target_port *target = target_ptr;
1487 struct ib_wc wc;
1488
1489 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1490 while (ib_poll_cq(cq, 1, &wc) > 0) {
1491 if (likely(wc.status == IB_WC_SUCCESS)) {
1492 srp_handle_recv(target, &wc);
1493 } else {
1494 srp_handle_qp_err(wc.status, false, target);
1495 }
1496 }
1497 }
1498
1499 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1500 {
1501 struct srp_target_port *target = target_ptr;
1502 struct ib_wc wc;
1503 struct srp_iu *iu;
1504
1505 while (ib_poll_cq(cq, 1, &wc) > 0) {
1506 if (likely(wc.status == IB_WC_SUCCESS)) {
1507 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1508 list_add(&iu->list, &target->free_tx);
1509 } else {
1510 srp_handle_qp_err(wc.status, true, target);
1511 }
1512 }
1513 }
1514
1515 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1516 {
1517 struct srp_target_port *target = host_to_target(shost);
1518 struct srp_rport *rport = target->rport;
1519 struct srp_request *req;
1520 struct srp_iu *iu;
1521 struct srp_cmd *cmd;
1522 struct ib_device *dev;
1523 unsigned long flags;
1524 int len, result;
1525 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1526
1527 /*
1528 * The SCSI EH thread is the only context from which srp_queuecommand()
1529 * can get invoked for blocked devices (SDEV_BLOCK /
1530 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1531 * locking the rport mutex if invoked from inside the SCSI EH.
1532 */
1533 if (in_scsi_eh)
1534 mutex_lock(&rport->mutex);
1535
1536 result = srp_chkready(target->rport);
1537 if (unlikely(result)) {
1538 scmnd->result = result;
1539 scmnd->scsi_done(scmnd);
1540 goto unlock_rport;
1541 }
1542
1543 spin_lock_irqsave(&target->lock, flags);
1544 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1545 if (!iu)
1546 goto err_unlock;
1547
1548 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1549 list_del(&req->list);
1550 spin_unlock_irqrestore(&target->lock, flags);
1551
1552 dev = target->srp_host->srp_dev->dev;
1553 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
1554 DMA_TO_DEVICE);
1555
1556 scmnd->result = 0;
1557 scmnd->host_scribble = (void *) req;
1558
1559 cmd = iu->buf;
1560 memset(cmd, 0, sizeof *cmd);
1561
1562 cmd->opcode = SRP_CMD;
1563 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1564 cmd->tag = req->index;
1565 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1566
1567 req->scmnd = scmnd;
1568 req->cmd = iu;
1569
1570 len = srp_map_data(scmnd, target, req);
1571 if (len < 0) {
1572 shost_printk(KERN_ERR, target->scsi_host,
1573 PFX "Failed to map data\n");
1574 goto err_iu;
1575 }
1576
1577 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
1578 DMA_TO_DEVICE);
1579
1580 if (srp_post_send(target, iu, len)) {
1581 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1582 goto err_unmap;
1583 }
1584
1585 unlock_rport:
1586 if (in_scsi_eh)
1587 mutex_unlock(&rport->mutex);
1588
1589 return 0;
1590
1591 err_unmap:
1592 srp_unmap_data(scmnd, target, req);
1593
1594 err_iu:
1595 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1596
1597 spin_lock_irqsave(&target->lock, flags);
1598 list_add(&req->list, &target->free_reqs);
1599
1600 err_unlock:
1601 spin_unlock_irqrestore(&target->lock, flags);
1602
1603 if (in_scsi_eh)
1604 mutex_unlock(&rport->mutex);
1605
1606 return SCSI_MLQUEUE_HOST_BUSY;
1607 }
1608
1609 /*
1610 * Note: the resources allocated in this function are freed in
1611 * srp_free_target_ib().
1612 */
1613 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1614 {
1615 int i;
1616
1617 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1618 GFP_KERNEL);
1619 if (!target->rx_ring)
1620 goto err_no_ring;
1621 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1622 GFP_KERNEL);
1623 if (!target->tx_ring)
1624 goto err_no_ring;
1625
1626 for (i = 0; i < target->queue_size; ++i) {
1627 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1628 target->max_ti_iu_len,
1629 GFP_KERNEL, DMA_FROM_DEVICE);
1630 if (!target->rx_ring[i])
1631 goto err;
1632 }
1633
1634 for (i = 0; i < target->queue_size; ++i) {
1635 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1636 target->max_iu_len,
1637 GFP_KERNEL, DMA_TO_DEVICE);
1638 if (!target->tx_ring[i])
1639 goto err;
1640
1641 list_add(&target->tx_ring[i]->list, &target->free_tx);
1642 }
1643
1644 return 0;
1645
1646 err:
1647 for (i = 0; i < target->queue_size; ++i) {
1648 srp_free_iu(target->srp_host, target->rx_ring[i]);
1649 srp_free_iu(target->srp_host, target->tx_ring[i]);
1650 }
1651
1652
1653 err_no_ring:
1654 kfree(target->tx_ring);
1655 target->tx_ring = NULL;
1656 kfree(target->rx_ring);
1657 target->rx_ring = NULL;
1658
1659 return -ENOMEM;
1660 }
1661
1662 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1663 {
1664 uint64_t T_tr_ns, max_compl_time_ms;
1665 uint32_t rq_tmo_jiffies;
1666
1667 /*
1668 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1669 * table 91), both the QP timeout and the retry count have to be set
1670 * for RC QP's during the RTR to RTS transition.
1671 */
1672 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1673 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1674
1675 /*
1676 * Set target->rq_tmo_jiffies to one second more than the largest time
1677 * it can take before an error completion is generated. See also
1678 * C9-140..142 in the IBTA spec for more information about how to
1679 * convert the QP Local ACK Timeout value to nanoseconds.
1680 */
1681 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1682 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1683 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1684 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1685
1686 return rq_tmo_jiffies;
1687 }
1688
1689 static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1690 struct srp_login_rsp *lrsp,
1691 struct srp_target_port *target)
1692 {
1693 struct ib_qp_attr *qp_attr = NULL;
1694 int attr_mask = 0;
1695 int ret;
1696 int i;
1697
1698 if (lrsp->opcode == SRP_LOGIN_RSP) {
1699 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1700 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1701
1702 /*
1703 * Reserve credits for task management so we don't
1704 * bounce requests back to the SCSI mid-layer.
1705 */
1706 target->scsi_host->can_queue
1707 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1708 target->scsi_host->can_queue);
1709 target->scsi_host->cmd_per_lun
1710 = min_t(int, target->scsi_host->can_queue,
1711 target->scsi_host->cmd_per_lun);
1712 } else {
1713 shost_printk(KERN_WARNING, target->scsi_host,
1714 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1715 ret = -ECONNRESET;
1716 goto error;
1717 }
1718
1719 if (!target->rx_ring) {
1720 ret = srp_alloc_iu_bufs(target);
1721 if (ret)
1722 goto error;
1723 }
1724
1725 ret = -ENOMEM;
1726 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1727 if (!qp_attr)
1728 goto error;
1729
1730 qp_attr->qp_state = IB_QPS_RTR;
1731 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1732 if (ret)
1733 goto error_free;
1734
1735 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1736 if (ret)
1737 goto error_free;
1738
1739 for (i = 0; i < target->queue_size; i++) {
1740 struct srp_iu *iu = target->rx_ring[i];
1741 ret = srp_post_recv(target, iu);
1742 if (ret)
1743 goto error_free;
1744 }
1745
1746 qp_attr->qp_state = IB_QPS_RTS;
1747 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1748 if (ret)
1749 goto error_free;
1750
1751 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1752
1753 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1754 if (ret)
1755 goto error_free;
1756
1757 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1758
1759 error_free:
1760 kfree(qp_attr);
1761
1762 error:
1763 target->status = ret;
1764 }
1765
1766 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1767 struct ib_cm_event *event,
1768 struct srp_target_port *target)
1769 {
1770 struct Scsi_Host *shost = target->scsi_host;
1771 struct ib_class_port_info *cpi;
1772 int opcode;
1773
1774 switch (event->param.rej_rcvd.reason) {
1775 case IB_CM_REJ_PORT_CM_REDIRECT:
1776 cpi = event->param.rej_rcvd.ari;
1777 target->path.dlid = cpi->redirect_lid;
1778 target->path.pkey = cpi->redirect_pkey;
1779 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1780 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1781
1782 target->status = target->path.dlid ?
1783 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1784 break;
1785
1786 case IB_CM_REJ_PORT_REDIRECT:
1787 if (srp_target_is_topspin(target)) {
1788 /*
1789 * Topspin/Cisco SRP gateways incorrectly send
1790 * reject reason code 25 when they mean 24
1791 * (port redirect).
1792 */
1793 memcpy(target->path.dgid.raw,
1794 event->param.rej_rcvd.ari, 16);
1795
1796 shost_printk(KERN_DEBUG, shost,
1797 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1798 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1799 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1800
1801 target->status = SRP_PORT_REDIRECT;
1802 } else {
1803 shost_printk(KERN_WARNING, shost,
1804 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1805 target->status = -ECONNRESET;
1806 }
1807 break;
1808
1809 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1810 shost_printk(KERN_WARNING, shost,
1811 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1812 target->status = -ECONNRESET;
1813 break;
1814
1815 case IB_CM_REJ_CONSUMER_DEFINED:
1816 opcode = *(u8 *) event->private_data;
1817 if (opcode == SRP_LOGIN_REJ) {
1818 struct srp_login_rej *rej = event->private_data;
1819 u32 reason = be32_to_cpu(rej->reason);
1820
1821 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1822 shost_printk(KERN_WARNING, shost,
1823 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1824 else
1825 shost_printk(KERN_WARNING, shost, PFX
1826 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
1827 target->path.sgid.raw,
1828 target->orig_dgid, reason);
1829 } else
1830 shost_printk(KERN_WARNING, shost,
1831 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1832 " opcode 0x%02x\n", opcode);
1833 target->status = -ECONNRESET;
1834 break;
1835
1836 case IB_CM_REJ_STALE_CONN:
1837 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1838 target->status = SRP_STALE_CONN;
1839 break;
1840
1841 default:
1842 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1843 event->param.rej_rcvd.reason);
1844 target->status = -ECONNRESET;
1845 }
1846 }
1847
1848 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1849 {
1850 struct srp_target_port *target = cm_id->context;
1851 int comp = 0;
1852
1853 switch (event->event) {
1854 case IB_CM_REQ_ERROR:
1855 shost_printk(KERN_DEBUG, target->scsi_host,
1856 PFX "Sending CM REQ failed\n");
1857 comp = 1;
1858 target->status = -ECONNRESET;
1859 break;
1860
1861 case IB_CM_REP_RECEIVED:
1862 comp = 1;
1863 srp_cm_rep_handler(cm_id, event->private_data, target);
1864 break;
1865
1866 case IB_CM_REJ_RECEIVED:
1867 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1868 comp = 1;
1869
1870 srp_cm_rej_handler(cm_id, event, target);
1871 break;
1872
1873 case IB_CM_DREQ_RECEIVED:
1874 shost_printk(KERN_WARNING, target->scsi_host,
1875 PFX "DREQ received - connection closed\n");
1876 srp_change_conn_state(target, false);
1877 if (ib_send_cm_drep(cm_id, NULL, 0))
1878 shost_printk(KERN_ERR, target->scsi_host,
1879 PFX "Sending CM DREP failed\n");
1880 queue_work(system_long_wq, &target->tl_err_work);
1881 break;
1882
1883 case IB_CM_TIMEWAIT_EXIT:
1884 shost_printk(KERN_ERR, target->scsi_host,
1885 PFX "connection closed\n");
1886 comp = 1;
1887
1888 target->status = 0;
1889 break;
1890
1891 case IB_CM_MRA_RECEIVED:
1892 case IB_CM_DREQ_ERROR:
1893 case IB_CM_DREP_RECEIVED:
1894 break;
1895
1896 default:
1897 shost_printk(KERN_WARNING, target->scsi_host,
1898 PFX "Unhandled CM event %d\n", event->event);
1899 break;
1900 }
1901
1902 if (comp)
1903 complete(&target->done);
1904
1905 return 0;
1906 }
1907
1908 /**
1909 * srp_change_queue_type - changing device queue tag type
1910 * @sdev: scsi device struct
1911 * @tag_type: requested tag type
1912 *
1913 * Returns queue tag type.
1914 */
1915 static int
1916 srp_change_queue_type(struct scsi_device *sdev, int tag_type)
1917 {
1918 if (sdev->tagged_supported) {
1919 scsi_set_tag_type(sdev, tag_type);
1920 if (tag_type)
1921 scsi_activate_tcq(sdev, sdev->queue_depth);
1922 else
1923 scsi_deactivate_tcq(sdev, sdev->queue_depth);
1924 } else
1925 tag_type = 0;
1926
1927 return tag_type;
1928 }
1929
1930 /**
1931 * srp_change_queue_depth - setting device queue depth
1932 * @sdev: scsi device struct
1933 * @qdepth: requested queue depth
1934 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
1935 * (see include/scsi/scsi_host.h for definition)
1936 *
1937 * Returns queue depth.
1938 */
1939 static int
1940 srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
1941 {
1942 struct Scsi_Host *shost = sdev->host;
1943 int max_depth;
1944 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
1945 max_depth = shost->can_queue;
1946 if (!sdev->tagged_supported)
1947 max_depth = 1;
1948 if (qdepth > max_depth)
1949 qdepth = max_depth;
1950 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
1951 } else if (reason == SCSI_QDEPTH_QFULL)
1952 scsi_track_queue_full(sdev, qdepth);
1953 else
1954 return -EOPNOTSUPP;
1955
1956 return sdev->queue_depth;
1957 }
1958
1959 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1960 u64 req_tag, unsigned int lun, u8 func)
1961 {
1962 struct srp_rport *rport = target->rport;
1963 struct ib_device *dev = target->srp_host->srp_dev->dev;
1964 struct srp_iu *iu;
1965 struct srp_tsk_mgmt *tsk_mgmt;
1966
1967 if (!target->connected || target->qp_in_error)
1968 return -1;
1969
1970 init_completion(&target->tsk_mgmt_done);
1971
1972 /*
1973 * Lock the rport mutex to avoid that srp_create_target_ib() is
1974 * invoked while a task management function is being sent.
1975 */
1976 mutex_lock(&rport->mutex);
1977 spin_lock_irq(&target->lock);
1978 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1979 spin_unlock_irq(&target->lock);
1980
1981 if (!iu) {
1982 mutex_unlock(&rport->mutex);
1983
1984 return -1;
1985 }
1986
1987 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1988 DMA_TO_DEVICE);
1989 tsk_mgmt = iu->buf;
1990 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1991
1992 tsk_mgmt->opcode = SRP_TSK_MGMT;
1993 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1994 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
1995 tsk_mgmt->tsk_mgmt_func = func;
1996 tsk_mgmt->task_tag = req_tag;
1997
1998 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1999 DMA_TO_DEVICE);
2000 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
2001 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
2002 mutex_unlock(&rport->mutex);
2003
2004 return -1;
2005 }
2006 mutex_unlock(&rport->mutex);
2007
2008 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
2009 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
2010 return -1;
2011
2012 return 0;
2013 }
2014
2015 static int srp_abort(struct scsi_cmnd *scmnd)
2016 {
2017 struct srp_target_port *target = host_to_target(scmnd->device->host);
2018 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
2019 int ret;
2020
2021 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
2022
2023 if (!req || !srp_claim_req(target, req, NULL, scmnd))
2024 return SUCCESS;
2025 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
2026 SRP_TSK_ABORT_TASK) == 0)
2027 ret = SUCCESS;
2028 else if (target->rport->state == SRP_RPORT_LOST)
2029 ret = FAST_IO_FAIL;
2030 else
2031 ret = FAILED;
2032 srp_free_req(target, req, scmnd, 0);
2033 scmnd->result = DID_ABORT << 16;
2034 scmnd->scsi_done(scmnd);
2035
2036 return ret;
2037 }
2038
2039 static int srp_reset_device(struct scsi_cmnd *scmnd)
2040 {
2041 struct srp_target_port *target = host_to_target(scmnd->device->host);
2042 int i;
2043
2044 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
2045
2046 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2047 SRP_TSK_LUN_RESET))
2048 return FAILED;
2049 if (target->tsk_mgmt_status)
2050 return FAILED;
2051
2052 for (i = 0; i < target->req_ring_size; ++i) {
2053 struct srp_request *req = &target->req_ring[i];
2054 srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
2055 }
2056
2057 return SUCCESS;
2058 }
2059
2060 static int srp_reset_host(struct scsi_cmnd *scmnd)
2061 {
2062 struct srp_target_port *target = host_to_target(scmnd->device->host);
2063
2064 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
2065
2066 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
2067 }
2068
2069 static int srp_slave_configure(struct scsi_device *sdev)
2070 {
2071 struct Scsi_Host *shost = sdev->host;
2072 struct srp_target_port *target = host_to_target(shost);
2073 struct request_queue *q = sdev->request_queue;
2074 unsigned long timeout;
2075
2076 if (sdev->type == TYPE_DISK) {
2077 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2078 blk_queue_rq_timeout(q, timeout);
2079 }
2080
2081 return 0;
2082 }
2083
2084 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2085 char *buf)
2086 {
2087 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2088
2089 return sprintf(buf, "0x%016llx\n",
2090 (unsigned long long) be64_to_cpu(target->id_ext));
2091 }
2092
2093 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2094 char *buf)
2095 {
2096 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2097
2098 return sprintf(buf, "0x%016llx\n",
2099 (unsigned long long) be64_to_cpu(target->ioc_guid));
2100 }
2101
2102 static ssize_t show_service_id(struct device *dev,
2103 struct device_attribute *attr, char *buf)
2104 {
2105 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2106
2107 return sprintf(buf, "0x%016llx\n",
2108 (unsigned long long) be64_to_cpu(target->service_id));
2109 }
2110
2111 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2112 char *buf)
2113 {
2114 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2115
2116 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2117 }
2118
2119 static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2120 char *buf)
2121 {
2122 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2123
2124 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2125 }
2126
2127 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2128 char *buf)
2129 {
2130 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2131
2132 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
2133 }
2134
2135 static ssize_t show_orig_dgid(struct device *dev,
2136 struct device_attribute *attr, char *buf)
2137 {
2138 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2139
2140 return sprintf(buf, "%pI6\n", target->orig_dgid);
2141 }
2142
2143 static ssize_t show_req_lim(struct device *dev,
2144 struct device_attribute *attr, char *buf)
2145 {
2146 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2147
2148 return sprintf(buf, "%d\n", target->req_lim);
2149 }
2150
2151 static ssize_t show_zero_req_lim(struct device *dev,
2152 struct device_attribute *attr, char *buf)
2153 {
2154 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2155
2156 return sprintf(buf, "%d\n", target->zero_req_lim);
2157 }
2158
2159 static ssize_t show_local_ib_port(struct device *dev,
2160 struct device_attribute *attr, char *buf)
2161 {
2162 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2163
2164 return sprintf(buf, "%d\n", target->srp_host->port);
2165 }
2166
2167 static ssize_t show_local_ib_device(struct device *dev,
2168 struct device_attribute *attr, char *buf)
2169 {
2170 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2171
2172 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
2173 }
2174
2175 static ssize_t show_comp_vector(struct device *dev,
2176 struct device_attribute *attr, char *buf)
2177 {
2178 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2179
2180 return sprintf(buf, "%d\n", target->comp_vector);
2181 }
2182
2183 static ssize_t show_tl_retry_count(struct device *dev,
2184 struct device_attribute *attr, char *buf)
2185 {
2186 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2187
2188 return sprintf(buf, "%d\n", target->tl_retry_count);
2189 }
2190
2191 static ssize_t show_cmd_sg_entries(struct device *dev,
2192 struct device_attribute *attr, char *buf)
2193 {
2194 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2195
2196 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2197 }
2198
2199 static ssize_t show_allow_ext_sg(struct device *dev,
2200 struct device_attribute *attr, char *buf)
2201 {
2202 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2203
2204 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2205 }
2206
2207 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2208 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2209 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2210 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2211 static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
2212 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2213 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
2214 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
2215 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2216 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2217 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
2218 static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
2219 static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
2220 static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
2221 static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
2222
2223 static struct device_attribute *srp_host_attrs[] = {
2224 &dev_attr_id_ext,
2225 &dev_attr_ioc_guid,
2226 &dev_attr_service_id,
2227 &dev_attr_pkey,
2228 &dev_attr_sgid,
2229 &dev_attr_dgid,
2230 &dev_attr_orig_dgid,
2231 &dev_attr_req_lim,
2232 &dev_attr_zero_req_lim,
2233 &dev_attr_local_ib_port,
2234 &dev_attr_local_ib_device,
2235 &dev_attr_comp_vector,
2236 &dev_attr_tl_retry_count,
2237 &dev_attr_cmd_sg_entries,
2238 &dev_attr_allow_ext_sg,
2239 NULL
2240 };
2241
2242 static struct scsi_host_template srp_template = {
2243 .module = THIS_MODULE,
2244 .name = "InfiniBand SRP initiator",
2245 .proc_name = DRV_NAME,
2246 .slave_configure = srp_slave_configure,
2247 .info = srp_target_info,
2248 .queuecommand = srp_queuecommand,
2249 .change_queue_depth = srp_change_queue_depth,
2250 .change_queue_type = srp_change_queue_type,
2251 .eh_abort_handler = srp_abort,
2252 .eh_device_reset_handler = srp_reset_device,
2253 .eh_host_reset_handler = srp_reset_host,
2254 .skip_settle_delay = true,
2255 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
2256 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
2257 .this_id = -1,
2258 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
2259 .use_clustering = ENABLE_CLUSTERING,
2260 .shost_attrs = srp_host_attrs
2261 };
2262
2263 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2264 {
2265 struct srp_rport_identifiers ids;
2266 struct srp_rport *rport;
2267
2268 sprintf(target->target_name, "SRP.T10:%016llX",
2269 (unsigned long long) be64_to_cpu(target->id_ext));
2270
2271 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
2272 return -ENODEV;
2273
2274 memcpy(ids.port_id, &target->id_ext, 8);
2275 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
2276 ids.roles = SRP_RPORT_ROLE_TARGET;
2277 rport = srp_rport_add(target->scsi_host, &ids);
2278 if (IS_ERR(rport)) {
2279 scsi_remove_host(target->scsi_host);
2280 return PTR_ERR(rport);
2281 }
2282
2283 rport->lld_data = target;
2284 target->rport = rport;
2285
2286 spin_lock(&host->target_lock);
2287 list_add_tail(&target->list, &host->target_list);
2288 spin_unlock(&host->target_lock);
2289
2290 target->state = SRP_TARGET_LIVE;
2291
2292 scsi_scan_target(&target->scsi_host->shost_gendev,
2293 0, target->scsi_id, SCAN_WILD_CARD, 0);
2294
2295 return 0;
2296 }
2297
2298 static void srp_release_dev(struct device *dev)
2299 {
2300 struct srp_host *host =
2301 container_of(dev, struct srp_host, dev);
2302
2303 complete(&host->released);
2304 }
2305
2306 static struct class srp_class = {
2307 .name = "infiniband_srp",
2308 .dev_release = srp_release_dev
2309 };
2310
2311 /**
2312 * srp_conn_unique() - check whether the connection to a target is unique
2313 */
2314 static bool srp_conn_unique(struct srp_host *host,
2315 struct srp_target_port *target)
2316 {
2317 struct srp_target_port *t;
2318 bool ret = false;
2319
2320 if (target->state == SRP_TARGET_REMOVED)
2321 goto out;
2322
2323 ret = true;
2324
2325 spin_lock(&host->target_lock);
2326 list_for_each_entry(t, &host->target_list, list) {
2327 if (t != target &&
2328 target->id_ext == t->id_ext &&
2329 target->ioc_guid == t->ioc_guid &&
2330 target->initiator_ext == t->initiator_ext) {
2331 ret = false;
2332 break;
2333 }
2334 }
2335 spin_unlock(&host->target_lock);
2336
2337 out:
2338 return ret;
2339 }
2340
2341 /*
2342 * Target ports are added by writing
2343 *
2344 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2345 * pkey=<P_Key>,service_id=<service ID>
2346 *
2347 * to the add_target sysfs attribute.
2348 */
2349 enum {
2350 SRP_OPT_ERR = 0,
2351 SRP_OPT_ID_EXT = 1 << 0,
2352 SRP_OPT_IOC_GUID = 1 << 1,
2353 SRP_OPT_DGID = 1 << 2,
2354 SRP_OPT_PKEY = 1 << 3,
2355 SRP_OPT_SERVICE_ID = 1 << 4,
2356 SRP_OPT_MAX_SECT = 1 << 5,
2357 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
2358 SRP_OPT_IO_CLASS = 1 << 7,
2359 SRP_OPT_INITIATOR_EXT = 1 << 8,
2360 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
2361 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2362 SRP_OPT_SG_TABLESIZE = 1 << 11,
2363 SRP_OPT_COMP_VECTOR = 1 << 12,
2364 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
2365 SRP_OPT_QUEUE_SIZE = 1 << 14,
2366 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2367 SRP_OPT_IOC_GUID |
2368 SRP_OPT_DGID |
2369 SRP_OPT_PKEY |
2370 SRP_OPT_SERVICE_ID),
2371 };
2372
2373 static const match_table_t srp_opt_tokens = {
2374 { SRP_OPT_ID_EXT, "id_ext=%s" },
2375 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2376 { SRP_OPT_DGID, "dgid=%s" },
2377 { SRP_OPT_PKEY, "pkey=%x" },
2378 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2379 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2380 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
2381 { SRP_OPT_IO_CLASS, "io_class=%x" },
2382 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
2383 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
2384 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2385 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
2386 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
2387 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
2388 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
2389 { SRP_OPT_ERR, NULL }
2390 };
2391
2392 static int srp_parse_options(const char *buf, struct srp_target_port *target)
2393 {
2394 char *options, *sep_opt;
2395 char *p;
2396 char dgid[3];
2397 substring_t args[MAX_OPT_ARGS];
2398 int opt_mask = 0;
2399 int token;
2400 int ret = -EINVAL;
2401 int i;
2402
2403 options = kstrdup(buf, GFP_KERNEL);
2404 if (!options)
2405 return -ENOMEM;
2406
2407 sep_opt = options;
2408 while ((p = strsep(&sep_opt, ",")) != NULL) {
2409 if (!*p)
2410 continue;
2411
2412 token = match_token(p, srp_opt_tokens, args);
2413 opt_mask |= token;
2414
2415 switch (token) {
2416 case SRP_OPT_ID_EXT:
2417 p = match_strdup(args);
2418 if (!p) {
2419 ret = -ENOMEM;
2420 goto out;
2421 }
2422 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2423 kfree(p);
2424 break;
2425
2426 case SRP_OPT_IOC_GUID:
2427 p = match_strdup(args);
2428 if (!p) {
2429 ret = -ENOMEM;
2430 goto out;
2431 }
2432 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2433 kfree(p);
2434 break;
2435
2436 case SRP_OPT_DGID:
2437 p = match_strdup(args);
2438 if (!p) {
2439 ret = -ENOMEM;
2440 goto out;
2441 }
2442 if (strlen(p) != 32) {
2443 pr_warn("bad dest GID parameter '%s'\n", p);
2444 kfree(p);
2445 goto out;
2446 }
2447
2448 for (i = 0; i < 16; ++i) {
2449 strlcpy(dgid, p + i * 2, 3);
2450 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2451 }
2452 kfree(p);
2453 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
2454 break;
2455
2456 case SRP_OPT_PKEY:
2457 if (match_hex(args, &token)) {
2458 pr_warn("bad P_Key parameter '%s'\n", p);
2459 goto out;
2460 }
2461 target->path.pkey = cpu_to_be16(token);
2462 break;
2463
2464 case SRP_OPT_SERVICE_ID:
2465 p = match_strdup(args);
2466 if (!p) {
2467 ret = -ENOMEM;
2468 goto out;
2469 }
2470 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2471 target->path.service_id = target->service_id;
2472 kfree(p);
2473 break;
2474
2475 case SRP_OPT_MAX_SECT:
2476 if (match_int(args, &token)) {
2477 pr_warn("bad max sect parameter '%s'\n", p);
2478 goto out;
2479 }
2480 target->scsi_host->max_sectors = token;
2481 break;
2482
2483 case SRP_OPT_QUEUE_SIZE:
2484 if (match_int(args, &token) || token < 1) {
2485 pr_warn("bad queue_size parameter '%s'\n", p);
2486 goto out;
2487 }
2488 target->scsi_host->can_queue = token;
2489 target->queue_size = token + SRP_RSP_SQ_SIZE +
2490 SRP_TSK_MGMT_SQ_SIZE;
2491 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2492 target->scsi_host->cmd_per_lun = token;
2493 break;
2494
2495 case SRP_OPT_MAX_CMD_PER_LUN:
2496 if (match_int(args, &token) || token < 1) {
2497 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2498 p);
2499 goto out;
2500 }
2501 target->scsi_host->cmd_per_lun = token;
2502 break;
2503
2504 case SRP_OPT_IO_CLASS:
2505 if (match_hex(args, &token)) {
2506 pr_warn("bad IO class parameter '%s'\n", p);
2507 goto out;
2508 }
2509 if (token != SRP_REV10_IB_IO_CLASS &&
2510 token != SRP_REV16A_IB_IO_CLASS) {
2511 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2512 token, SRP_REV10_IB_IO_CLASS,
2513 SRP_REV16A_IB_IO_CLASS);
2514 goto out;
2515 }
2516 target->io_class = token;
2517 break;
2518
2519 case SRP_OPT_INITIATOR_EXT:
2520 p = match_strdup(args);
2521 if (!p) {
2522 ret = -ENOMEM;
2523 goto out;
2524 }
2525 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2526 kfree(p);
2527 break;
2528
2529 case SRP_OPT_CMD_SG_ENTRIES:
2530 if (match_int(args, &token) || token < 1 || token > 255) {
2531 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2532 p);
2533 goto out;
2534 }
2535 target->cmd_sg_cnt = token;
2536 break;
2537
2538 case SRP_OPT_ALLOW_EXT_SG:
2539 if (match_int(args, &token)) {
2540 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
2541 goto out;
2542 }
2543 target->allow_ext_sg = !!token;
2544 break;
2545
2546 case SRP_OPT_SG_TABLESIZE:
2547 if (match_int(args, &token) || token < 1 ||
2548 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
2549 pr_warn("bad max sg_tablesize parameter '%s'\n",
2550 p);
2551 goto out;
2552 }
2553 target->sg_tablesize = token;
2554 break;
2555
2556 case SRP_OPT_COMP_VECTOR:
2557 if (match_int(args, &token) || token < 0) {
2558 pr_warn("bad comp_vector parameter '%s'\n", p);
2559 goto out;
2560 }
2561 target->comp_vector = token;
2562 break;
2563
2564 case SRP_OPT_TL_RETRY_COUNT:
2565 if (match_int(args, &token) || token < 2 || token > 7) {
2566 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2567 p);
2568 goto out;
2569 }
2570 target->tl_retry_count = token;
2571 break;
2572
2573 default:
2574 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2575 p);
2576 goto out;
2577 }
2578 }
2579
2580 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2581 ret = 0;
2582 else
2583 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2584 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2585 !(srp_opt_tokens[i].token & opt_mask))
2586 pr_warn("target creation request is missing parameter '%s'\n",
2587 srp_opt_tokens[i].pattern);
2588
2589 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2590 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2591 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2592 target->scsi_host->cmd_per_lun,
2593 target->scsi_host->can_queue);
2594
2595 out:
2596 kfree(options);
2597 return ret;
2598 }
2599
2600 static ssize_t srp_create_target(struct device *dev,
2601 struct device_attribute *attr,
2602 const char *buf, size_t count)
2603 {
2604 struct srp_host *host =
2605 container_of(dev, struct srp_host, dev);
2606 struct Scsi_Host *target_host;
2607 struct srp_target_port *target;
2608 struct ib_device *ibdev = host->srp_dev->dev;
2609 int ret;
2610
2611 target_host = scsi_host_alloc(&srp_template,
2612 sizeof (struct srp_target_port));
2613 if (!target_host)
2614 return -ENOMEM;
2615
2616 target_host->transportt = ib_srp_transport_template;
2617 target_host->max_channel = 0;
2618 target_host->max_id = 1;
2619 target_host->max_lun = SRP_MAX_LUN;
2620 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
2621
2622 target = host_to_target(target_host);
2623
2624 target->io_class = SRP_REV16A_IB_IO_CLASS;
2625 target->scsi_host = target_host;
2626 target->srp_host = host;
2627 target->lkey = host->srp_dev->mr->lkey;
2628 target->rkey = host->srp_dev->mr->rkey;
2629 target->cmd_sg_cnt = cmd_sg_entries;
2630 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2631 target->allow_ext_sg = allow_ext_sg;
2632 target->tl_retry_count = 7;
2633 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
2634
2635 mutex_lock(&host->add_target_mutex);
2636
2637 ret = srp_parse_options(buf, target);
2638 if (ret)
2639 goto err;
2640
2641 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2642
2643 if (!srp_conn_unique(target->srp_host, target)) {
2644 shost_printk(KERN_INFO, target->scsi_host,
2645 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2646 be64_to_cpu(target->id_ext),
2647 be64_to_cpu(target->ioc_guid),
2648 be64_to_cpu(target->initiator_ext));
2649 ret = -EEXIST;
2650 goto err;
2651 }
2652
2653 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2654 target->cmd_sg_cnt < target->sg_tablesize) {
2655 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
2656 target->sg_tablesize = target->cmd_sg_cnt;
2657 }
2658
2659 target_host->sg_tablesize = target->sg_tablesize;
2660 target->indirect_size = target->sg_tablesize *
2661 sizeof (struct srp_direct_buf);
2662 target->max_iu_len = sizeof (struct srp_cmd) +
2663 sizeof (struct srp_indirect_buf) +
2664 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2665
2666 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
2667 INIT_WORK(&target->remove_work, srp_remove_work);
2668 spin_lock_init(&target->lock);
2669 INIT_LIST_HEAD(&target->free_tx);
2670 ret = srp_alloc_req_data(target);
2671 if (ret)
2672 goto err_free_mem;
2673
2674 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2675 if (ret)
2676 goto err_free_mem;
2677
2678 ret = srp_create_target_ib(target);
2679 if (ret)
2680 goto err_free_mem;
2681
2682 ret = srp_new_cm_id(target);
2683 if (ret)
2684 goto err_free_ib;
2685
2686 ret = srp_connect_target(target);
2687 if (ret) {
2688 shost_printk(KERN_ERR, target->scsi_host,
2689 PFX "Connection failed\n");
2690 goto err_cm_id;
2691 }
2692
2693 ret = srp_add_target(host, target);
2694 if (ret)
2695 goto err_disconnect;
2696
2697 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2698 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
2699 be64_to_cpu(target->id_ext),
2700 be64_to_cpu(target->ioc_guid),
2701 be16_to_cpu(target->path.pkey),
2702 be64_to_cpu(target->service_id),
2703 target->path.sgid.raw, target->path.dgid.raw);
2704
2705 ret = count;
2706
2707 out:
2708 mutex_unlock(&host->add_target_mutex);
2709 return ret;
2710
2711 err_disconnect:
2712 srp_disconnect_target(target);
2713
2714 err_cm_id:
2715 ib_destroy_cm_id(target->cm_id);
2716
2717 err_free_ib:
2718 srp_free_target_ib(target);
2719
2720 err_free_mem:
2721 srp_free_req_data(target);
2722
2723 err:
2724 scsi_host_put(target_host);
2725 goto out;
2726 }
2727
2728 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2729
2730 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2731 char *buf)
2732 {
2733 struct srp_host *host = container_of(dev, struct srp_host, dev);
2734
2735 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2736 }
2737
2738 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2739
2740 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2741 char *buf)
2742 {
2743 struct srp_host *host = container_of(dev, struct srp_host, dev);
2744
2745 return sprintf(buf, "%d\n", host->port);
2746 }
2747
2748 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2749
2750 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2751 {
2752 struct srp_host *host;
2753
2754 host = kzalloc(sizeof *host, GFP_KERNEL);
2755 if (!host)
2756 return NULL;
2757
2758 INIT_LIST_HEAD(&host->target_list);
2759 spin_lock_init(&host->target_lock);
2760 init_completion(&host->released);
2761 mutex_init(&host->add_target_mutex);
2762 host->srp_dev = device;
2763 host->port = port;
2764
2765 host->dev.class = &srp_class;
2766 host->dev.parent = device->dev->dma_device;
2767 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2768
2769 if (device_register(&host->dev))
2770 goto free_host;
2771 if (device_create_file(&host->dev, &dev_attr_add_target))
2772 goto err_class;
2773 if (device_create_file(&host->dev, &dev_attr_ibdev))
2774 goto err_class;
2775 if (device_create_file(&host->dev, &dev_attr_port))
2776 goto err_class;
2777
2778 return host;
2779
2780 err_class:
2781 device_unregister(&host->dev);
2782
2783 free_host:
2784 kfree(host);
2785
2786 return NULL;
2787 }
2788
2789 static void srp_add_one(struct ib_device *device)
2790 {
2791 struct srp_device *srp_dev;
2792 struct ib_device_attr *dev_attr;
2793 struct ib_fmr_pool_param fmr_param;
2794 struct srp_host *host;
2795 int max_pages_per_fmr, fmr_page_shift, s, e, p;
2796
2797 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2798 if (!dev_attr)
2799 return;
2800
2801 if (ib_query_device(device, dev_attr)) {
2802 pr_warn("Query device failed for %s\n", device->name);
2803 goto free_attr;
2804 }
2805
2806 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2807 if (!srp_dev)
2808 goto free_attr;
2809
2810 /*
2811 * Use the smallest page size supported by the HCA, down to a
2812 * minimum of 4096 bytes. We're unlikely to build large sglists
2813 * out of smaller entries.
2814 */
2815 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2816 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2817 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2818 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
2819
2820 INIT_LIST_HEAD(&srp_dev->dev_list);
2821
2822 srp_dev->dev = device;
2823 srp_dev->pd = ib_alloc_pd(device);
2824 if (IS_ERR(srp_dev->pd))
2825 goto free_dev;
2826
2827 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2828 IB_ACCESS_LOCAL_WRITE |
2829 IB_ACCESS_REMOTE_READ |
2830 IB_ACCESS_REMOTE_WRITE);
2831 if (IS_ERR(srp_dev->mr))
2832 goto err_pd;
2833
2834 for (max_pages_per_fmr = SRP_FMR_SIZE;
2835 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2836 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2837 memset(&fmr_param, 0, sizeof fmr_param);
2838 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2839 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2840 fmr_param.cache = 1;
2841 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2842 fmr_param.page_shift = fmr_page_shift;
2843 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2844 IB_ACCESS_REMOTE_WRITE |
2845 IB_ACCESS_REMOTE_READ);
2846
2847 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2848 if (!IS_ERR(srp_dev->fmr_pool))
2849 break;
2850 }
2851
2852 if (IS_ERR(srp_dev->fmr_pool))
2853 srp_dev->fmr_pool = NULL;
2854
2855 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2856 s = 0;
2857 e = 0;
2858 } else {
2859 s = 1;
2860 e = device->phys_port_cnt;
2861 }
2862
2863 for (p = s; p <= e; ++p) {
2864 host = srp_add_port(srp_dev, p);
2865 if (host)
2866 list_add_tail(&host->list, &srp_dev->dev_list);
2867 }
2868
2869 ib_set_client_data(device, &srp_client, srp_dev);
2870
2871 goto free_attr;
2872
2873 err_pd:
2874 ib_dealloc_pd(srp_dev->pd);
2875
2876 free_dev:
2877 kfree(srp_dev);
2878
2879 free_attr:
2880 kfree(dev_attr);
2881 }
2882
2883 static void srp_remove_one(struct ib_device *device)
2884 {
2885 struct srp_device *srp_dev;
2886 struct srp_host *host, *tmp_host;
2887 struct srp_target_port *target;
2888
2889 srp_dev = ib_get_client_data(device, &srp_client);
2890 if (!srp_dev)
2891 return;
2892
2893 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2894 device_unregister(&host->dev);
2895 /*
2896 * Wait for the sysfs entry to go away, so that no new
2897 * target ports can be created.
2898 */
2899 wait_for_completion(&host->released);
2900
2901 /*
2902 * Remove all target ports.
2903 */
2904 spin_lock(&host->target_lock);
2905 list_for_each_entry(target, &host->target_list, list)
2906 srp_queue_remove_work(target);
2907 spin_unlock(&host->target_lock);
2908
2909 /*
2910 * Wait for target port removal tasks.
2911 */
2912 flush_workqueue(system_long_wq);
2913
2914 kfree(host);
2915 }
2916
2917 if (srp_dev->fmr_pool)
2918 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2919 ib_dereg_mr(srp_dev->mr);
2920 ib_dealloc_pd(srp_dev->pd);
2921
2922 kfree(srp_dev);
2923 }
2924
2925 static struct srp_function_template ib_srp_transport_functions = {
2926 .has_rport_state = true,
2927 .reset_timer_if_blocked = true,
2928 .reconnect_delay = &srp_reconnect_delay,
2929 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
2930 .dev_loss_tmo = &srp_dev_loss_tmo,
2931 .reconnect = srp_rport_reconnect,
2932 .rport_delete = srp_rport_delete,
2933 .terminate_rport_io = srp_terminate_io,
2934 };
2935
2936 static int __init srp_init_module(void)
2937 {
2938 int ret;
2939
2940 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2941
2942 if (srp_sg_tablesize) {
2943 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
2944 if (!cmd_sg_entries)
2945 cmd_sg_entries = srp_sg_tablesize;
2946 }
2947
2948 if (!cmd_sg_entries)
2949 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2950
2951 if (cmd_sg_entries > 255) {
2952 pr_warn("Clamping cmd_sg_entries to 255\n");
2953 cmd_sg_entries = 255;
2954 }
2955
2956 if (!indirect_sg_entries)
2957 indirect_sg_entries = cmd_sg_entries;
2958 else if (indirect_sg_entries < cmd_sg_entries) {
2959 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2960 cmd_sg_entries);
2961 indirect_sg_entries = cmd_sg_entries;
2962 }
2963
2964 ib_srp_transport_template =
2965 srp_attach_transport(&ib_srp_transport_functions);
2966 if (!ib_srp_transport_template)
2967 return -ENOMEM;
2968
2969 ret = class_register(&srp_class);
2970 if (ret) {
2971 pr_err("couldn't register class infiniband_srp\n");
2972 srp_release_transport(ib_srp_transport_template);
2973 return ret;
2974 }
2975
2976 ib_sa_register_client(&srp_sa_client);
2977
2978 ret = ib_register_client(&srp_client);
2979 if (ret) {
2980 pr_err("couldn't register IB client\n");
2981 srp_release_transport(ib_srp_transport_template);
2982 ib_sa_unregister_client(&srp_sa_client);
2983 class_unregister(&srp_class);
2984 return ret;
2985 }
2986
2987 return 0;
2988 }
2989
2990 static void __exit srp_cleanup_module(void)
2991 {
2992 ib_unregister_client(&srp_client);
2993 ib_sa_unregister_client(&srp_sa_client);
2994 class_unregister(&srp_class);
2995 srp_release_transport(ib_srp_transport_template);
2996 }
2997
2998 module_init(srp_init_module);
2999 module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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