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IB/srp: Fix residual handling
[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) KBUILD_MODNAME ": " 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 bool prefer_fr;
70 static bool register_always;
71 static int topspin_workarounds = 1;
72
73 module_param(srp_sg_tablesize, uint, 0444);
74 MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
75
76 module_param(cmd_sg_entries, uint, 0444);
77 MODULE_PARM_DESC(cmd_sg_entries,
78 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
79
80 module_param(indirect_sg_entries, uint, 0444);
81 MODULE_PARM_DESC(indirect_sg_entries,
82 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
83
84 module_param(allow_ext_sg, bool, 0444);
85 MODULE_PARM_DESC(allow_ext_sg,
86 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
87
88 module_param(topspin_workarounds, int, 0444);
89 MODULE_PARM_DESC(topspin_workarounds,
90 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
91
92 module_param(prefer_fr, bool, 0444);
93 MODULE_PARM_DESC(prefer_fr,
94 "Whether to use fast registration if both FMR and fast registration are supported");
95
96 module_param(register_always, bool, 0444);
97 MODULE_PARM_DESC(register_always,
98 "Use memory registration even for contiguous memory regions");
99
100 static struct kernel_param_ops srp_tmo_ops;
101
102 static int srp_reconnect_delay = 10;
103 module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
104 S_IRUGO | S_IWUSR);
105 MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
106
107 static int srp_fast_io_fail_tmo = 15;
108 module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
109 S_IRUGO | S_IWUSR);
110 MODULE_PARM_DESC(fast_io_fail_tmo,
111 "Number of seconds between the observation of a transport"
112 " layer error and failing all I/O. \"off\" means that this"
113 " functionality is disabled.");
114
115 static int srp_dev_loss_tmo = 600;
116 module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
117 S_IRUGO | S_IWUSR);
118 MODULE_PARM_DESC(dev_loss_tmo,
119 "Maximum number of seconds that the SRP transport should"
120 " insulate transport layer errors. After this time has been"
121 " exceeded the SCSI host is removed. Should be"
122 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
123 " if fast_io_fail_tmo has not been set. \"off\" means that"
124 " this functionality is disabled.");
125
126 static void srp_add_one(struct ib_device *device);
127 static void srp_remove_one(struct ib_device *device);
128 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
129 static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
130 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
131
132 static struct scsi_transport_template *ib_srp_transport_template;
133 static struct workqueue_struct *srp_remove_wq;
134
135 static struct ib_client srp_client = {
136 .name = "srp",
137 .add = srp_add_one,
138 .remove = srp_remove_one
139 };
140
141 static struct ib_sa_client srp_sa_client;
142
143 static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
144 {
145 int tmo = *(int *)kp->arg;
146
147 if (tmo >= 0)
148 return sprintf(buffer, "%d", tmo);
149 else
150 return sprintf(buffer, "off");
151 }
152
153 static int srp_tmo_set(const char *val, const struct kernel_param *kp)
154 {
155 int tmo, res;
156
157 if (strncmp(val, "off", 3) != 0) {
158 res = kstrtoint(val, 0, &tmo);
159 if (res)
160 goto out;
161 } else {
162 tmo = -1;
163 }
164 if (kp->arg == &srp_reconnect_delay)
165 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
166 srp_dev_loss_tmo);
167 else if (kp->arg == &srp_fast_io_fail_tmo)
168 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
169 else
170 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
171 tmo);
172 if (res)
173 goto out;
174 *(int *)kp->arg = tmo;
175
176 out:
177 return res;
178 }
179
180 static struct kernel_param_ops srp_tmo_ops = {
181 .get = srp_tmo_get,
182 .set = srp_tmo_set,
183 };
184
185 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
186 {
187 return (struct srp_target_port *) host->hostdata;
188 }
189
190 static const char *srp_target_info(struct Scsi_Host *host)
191 {
192 return host_to_target(host)->target_name;
193 }
194
195 static int srp_target_is_topspin(struct srp_target_port *target)
196 {
197 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
198 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
199
200 return topspin_workarounds &&
201 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
202 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
203 }
204
205 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
206 gfp_t gfp_mask,
207 enum dma_data_direction direction)
208 {
209 struct srp_iu *iu;
210
211 iu = kmalloc(sizeof *iu, gfp_mask);
212 if (!iu)
213 goto out;
214
215 iu->buf = kzalloc(size, gfp_mask);
216 if (!iu->buf)
217 goto out_free_iu;
218
219 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
220 direction);
221 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
222 goto out_free_buf;
223
224 iu->size = size;
225 iu->direction = direction;
226
227 return iu;
228
229 out_free_buf:
230 kfree(iu->buf);
231 out_free_iu:
232 kfree(iu);
233 out:
234 return NULL;
235 }
236
237 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
238 {
239 if (!iu)
240 return;
241
242 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
243 iu->direction);
244 kfree(iu->buf);
245 kfree(iu);
246 }
247
248 static void srp_qp_event(struct ib_event *event, void *context)
249 {
250 pr_debug("QP event %d\n", event->event);
251 }
252
253 static int srp_init_qp(struct srp_target_port *target,
254 struct ib_qp *qp)
255 {
256 struct ib_qp_attr *attr;
257 int ret;
258
259 attr = kmalloc(sizeof *attr, GFP_KERNEL);
260 if (!attr)
261 return -ENOMEM;
262
263 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
264 target->srp_host->port,
265 be16_to_cpu(target->path.pkey),
266 &attr->pkey_index);
267 if (ret)
268 goto out;
269
270 attr->qp_state = IB_QPS_INIT;
271 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
272 IB_ACCESS_REMOTE_WRITE);
273 attr->port_num = target->srp_host->port;
274
275 ret = ib_modify_qp(qp, attr,
276 IB_QP_STATE |
277 IB_QP_PKEY_INDEX |
278 IB_QP_ACCESS_FLAGS |
279 IB_QP_PORT);
280
281 out:
282 kfree(attr);
283 return ret;
284 }
285
286 static int srp_new_cm_id(struct srp_target_port *target)
287 {
288 struct ib_cm_id *new_cm_id;
289
290 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
291 srp_cm_handler, target);
292 if (IS_ERR(new_cm_id))
293 return PTR_ERR(new_cm_id);
294
295 if (target->cm_id)
296 ib_destroy_cm_id(target->cm_id);
297 target->cm_id = new_cm_id;
298
299 return 0;
300 }
301
302 static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target)
303 {
304 struct srp_device *dev = target->srp_host->srp_dev;
305 struct ib_fmr_pool_param fmr_param;
306
307 memset(&fmr_param, 0, sizeof(fmr_param));
308 fmr_param.pool_size = target->scsi_host->can_queue;
309 fmr_param.dirty_watermark = fmr_param.pool_size / 4;
310 fmr_param.cache = 1;
311 fmr_param.max_pages_per_fmr = dev->max_pages_per_mr;
312 fmr_param.page_shift = ilog2(dev->mr_page_size);
313 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
314 IB_ACCESS_REMOTE_WRITE |
315 IB_ACCESS_REMOTE_READ);
316
317 return ib_create_fmr_pool(dev->pd, &fmr_param);
318 }
319
320 /**
321 * srp_destroy_fr_pool() - free the resources owned by a pool
322 * @pool: Fast registration pool to be destroyed.
323 */
324 static void srp_destroy_fr_pool(struct srp_fr_pool *pool)
325 {
326 int i;
327 struct srp_fr_desc *d;
328
329 if (!pool)
330 return;
331
332 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
333 if (d->frpl)
334 ib_free_fast_reg_page_list(d->frpl);
335 if (d->mr)
336 ib_dereg_mr(d->mr);
337 }
338 kfree(pool);
339 }
340
341 /**
342 * srp_create_fr_pool() - allocate and initialize a pool for fast registration
343 * @device: IB device to allocate fast registration descriptors for.
344 * @pd: Protection domain associated with the FR descriptors.
345 * @pool_size: Number of descriptors to allocate.
346 * @max_page_list_len: Maximum fast registration work request page list length.
347 */
348 static struct srp_fr_pool *srp_create_fr_pool(struct ib_device *device,
349 struct ib_pd *pd, int pool_size,
350 int max_page_list_len)
351 {
352 struct srp_fr_pool *pool;
353 struct srp_fr_desc *d;
354 struct ib_mr *mr;
355 struct ib_fast_reg_page_list *frpl;
356 int i, ret = -EINVAL;
357
358 if (pool_size <= 0)
359 goto err;
360 ret = -ENOMEM;
361 pool = kzalloc(sizeof(struct srp_fr_pool) +
362 pool_size * sizeof(struct srp_fr_desc), GFP_KERNEL);
363 if (!pool)
364 goto err;
365 pool->size = pool_size;
366 pool->max_page_list_len = max_page_list_len;
367 spin_lock_init(&pool->lock);
368 INIT_LIST_HEAD(&pool->free_list);
369
370 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
371 mr = ib_alloc_fast_reg_mr(pd, max_page_list_len);
372 if (IS_ERR(mr)) {
373 ret = PTR_ERR(mr);
374 goto destroy_pool;
375 }
376 d->mr = mr;
377 frpl = ib_alloc_fast_reg_page_list(device, max_page_list_len);
378 if (IS_ERR(frpl)) {
379 ret = PTR_ERR(frpl);
380 goto destroy_pool;
381 }
382 d->frpl = frpl;
383 list_add_tail(&d->entry, &pool->free_list);
384 }
385
386 out:
387 return pool;
388
389 destroy_pool:
390 srp_destroy_fr_pool(pool);
391
392 err:
393 pool = ERR_PTR(ret);
394 goto out;
395 }
396
397 /**
398 * srp_fr_pool_get() - obtain a descriptor suitable for fast registration
399 * @pool: Pool to obtain descriptor from.
400 */
401 static struct srp_fr_desc *srp_fr_pool_get(struct srp_fr_pool *pool)
402 {
403 struct srp_fr_desc *d = NULL;
404 unsigned long flags;
405
406 spin_lock_irqsave(&pool->lock, flags);
407 if (!list_empty(&pool->free_list)) {
408 d = list_first_entry(&pool->free_list, typeof(*d), entry);
409 list_del(&d->entry);
410 }
411 spin_unlock_irqrestore(&pool->lock, flags);
412
413 return d;
414 }
415
416 /**
417 * srp_fr_pool_put() - put an FR descriptor back in the free list
418 * @pool: Pool the descriptor was allocated from.
419 * @desc: Pointer to an array of fast registration descriptor pointers.
420 * @n: Number of descriptors to put back.
421 *
422 * Note: The caller must already have queued an invalidation request for
423 * desc->mr->rkey before calling this function.
424 */
425 static void srp_fr_pool_put(struct srp_fr_pool *pool, struct srp_fr_desc **desc,
426 int n)
427 {
428 unsigned long flags;
429 int i;
430
431 spin_lock_irqsave(&pool->lock, flags);
432 for (i = 0; i < n; i++)
433 list_add(&desc[i]->entry, &pool->free_list);
434 spin_unlock_irqrestore(&pool->lock, flags);
435 }
436
437 static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target)
438 {
439 struct srp_device *dev = target->srp_host->srp_dev;
440
441 return srp_create_fr_pool(dev->dev, dev->pd,
442 target->scsi_host->can_queue,
443 dev->max_pages_per_mr);
444 }
445
446 static int srp_create_target_ib(struct srp_target_port *target)
447 {
448 struct srp_device *dev = target->srp_host->srp_dev;
449 struct ib_qp_init_attr *init_attr;
450 struct ib_cq *recv_cq, *send_cq;
451 struct ib_qp *qp;
452 struct ib_fmr_pool *fmr_pool = NULL;
453 struct srp_fr_pool *fr_pool = NULL;
454 const int m = 1 + dev->use_fast_reg;
455 int ret;
456
457 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
458 if (!init_attr)
459 return -ENOMEM;
460
461 recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, target,
462 target->queue_size, target->comp_vector);
463 if (IS_ERR(recv_cq)) {
464 ret = PTR_ERR(recv_cq);
465 goto err;
466 }
467
468 send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, target,
469 m * target->queue_size, target->comp_vector);
470 if (IS_ERR(send_cq)) {
471 ret = PTR_ERR(send_cq);
472 goto err_recv_cq;
473 }
474
475 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
476
477 init_attr->event_handler = srp_qp_event;
478 init_attr->cap.max_send_wr = m * target->queue_size;
479 init_attr->cap.max_recv_wr = target->queue_size;
480 init_attr->cap.max_recv_sge = 1;
481 init_attr->cap.max_send_sge = 1;
482 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
483 init_attr->qp_type = IB_QPT_RC;
484 init_attr->send_cq = send_cq;
485 init_attr->recv_cq = recv_cq;
486
487 qp = ib_create_qp(dev->pd, init_attr);
488 if (IS_ERR(qp)) {
489 ret = PTR_ERR(qp);
490 goto err_send_cq;
491 }
492
493 ret = srp_init_qp(target, qp);
494 if (ret)
495 goto err_qp;
496
497 if (dev->use_fast_reg && dev->has_fr) {
498 fr_pool = srp_alloc_fr_pool(target);
499 if (IS_ERR(fr_pool)) {
500 ret = PTR_ERR(fr_pool);
501 shost_printk(KERN_WARNING, target->scsi_host, PFX
502 "FR pool allocation failed (%d)\n", ret);
503 goto err_qp;
504 }
505 if (target->fr_pool)
506 srp_destroy_fr_pool(target->fr_pool);
507 target->fr_pool = fr_pool;
508 } else if (!dev->use_fast_reg && dev->has_fmr) {
509 fmr_pool = srp_alloc_fmr_pool(target);
510 if (IS_ERR(fmr_pool)) {
511 ret = PTR_ERR(fmr_pool);
512 shost_printk(KERN_WARNING, target->scsi_host, PFX
513 "FMR pool allocation failed (%d)\n", ret);
514 goto err_qp;
515 }
516 if (target->fmr_pool)
517 ib_destroy_fmr_pool(target->fmr_pool);
518 target->fmr_pool = fmr_pool;
519 }
520
521 if (target->qp)
522 ib_destroy_qp(target->qp);
523 if (target->recv_cq)
524 ib_destroy_cq(target->recv_cq);
525 if (target->send_cq)
526 ib_destroy_cq(target->send_cq);
527
528 target->qp = qp;
529 target->recv_cq = recv_cq;
530 target->send_cq = send_cq;
531
532 kfree(init_attr);
533 return 0;
534
535 err_qp:
536 ib_destroy_qp(qp);
537
538 err_send_cq:
539 ib_destroy_cq(send_cq);
540
541 err_recv_cq:
542 ib_destroy_cq(recv_cq);
543
544 err:
545 kfree(init_attr);
546 return ret;
547 }
548
549 /*
550 * Note: this function may be called without srp_alloc_iu_bufs() having been
551 * invoked. Hence the target->[rt]x_ring checks.
552 */
553 static void srp_free_target_ib(struct srp_target_port *target)
554 {
555 struct srp_device *dev = target->srp_host->srp_dev;
556 int i;
557
558 if (dev->use_fast_reg) {
559 if (target->fr_pool)
560 srp_destroy_fr_pool(target->fr_pool);
561 } else {
562 if (target->fmr_pool)
563 ib_destroy_fmr_pool(target->fmr_pool);
564 }
565 ib_destroy_qp(target->qp);
566 ib_destroy_cq(target->send_cq);
567 ib_destroy_cq(target->recv_cq);
568
569 target->qp = NULL;
570 target->send_cq = target->recv_cq = NULL;
571
572 if (target->rx_ring) {
573 for (i = 0; i < target->queue_size; ++i)
574 srp_free_iu(target->srp_host, target->rx_ring[i]);
575 kfree(target->rx_ring);
576 target->rx_ring = NULL;
577 }
578 if (target->tx_ring) {
579 for (i = 0; i < target->queue_size; ++i)
580 srp_free_iu(target->srp_host, target->tx_ring[i]);
581 kfree(target->tx_ring);
582 target->tx_ring = NULL;
583 }
584 }
585
586 static void srp_path_rec_completion(int status,
587 struct ib_sa_path_rec *pathrec,
588 void *target_ptr)
589 {
590 struct srp_target_port *target = target_ptr;
591
592 target->status = status;
593 if (status)
594 shost_printk(KERN_ERR, target->scsi_host,
595 PFX "Got failed path rec status %d\n", status);
596 else
597 target->path = *pathrec;
598 complete(&target->done);
599 }
600
601 static int srp_lookup_path(struct srp_target_port *target)
602 {
603 int ret;
604
605 target->path.numb_path = 1;
606
607 init_completion(&target->done);
608
609 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
610 target->srp_host->srp_dev->dev,
611 target->srp_host->port,
612 &target->path,
613 IB_SA_PATH_REC_SERVICE_ID |
614 IB_SA_PATH_REC_DGID |
615 IB_SA_PATH_REC_SGID |
616 IB_SA_PATH_REC_NUMB_PATH |
617 IB_SA_PATH_REC_PKEY,
618 SRP_PATH_REC_TIMEOUT_MS,
619 GFP_KERNEL,
620 srp_path_rec_completion,
621 target, &target->path_query);
622 if (target->path_query_id < 0)
623 return target->path_query_id;
624
625 ret = wait_for_completion_interruptible(&target->done);
626 if (ret < 0)
627 return ret;
628
629 if (target->status < 0)
630 shost_printk(KERN_WARNING, target->scsi_host,
631 PFX "Path record query failed\n");
632
633 return target->status;
634 }
635
636 static int srp_send_req(struct srp_target_port *target)
637 {
638 struct {
639 struct ib_cm_req_param param;
640 struct srp_login_req priv;
641 } *req = NULL;
642 int status;
643
644 req = kzalloc(sizeof *req, GFP_KERNEL);
645 if (!req)
646 return -ENOMEM;
647
648 req->param.primary_path = &target->path;
649 req->param.alternate_path = NULL;
650 req->param.service_id = target->service_id;
651 req->param.qp_num = target->qp->qp_num;
652 req->param.qp_type = target->qp->qp_type;
653 req->param.private_data = &req->priv;
654 req->param.private_data_len = sizeof req->priv;
655 req->param.flow_control = 1;
656
657 get_random_bytes(&req->param.starting_psn, 4);
658 req->param.starting_psn &= 0xffffff;
659
660 /*
661 * Pick some arbitrary defaults here; we could make these
662 * module parameters if anyone cared about setting them.
663 */
664 req->param.responder_resources = 4;
665 req->param.remote_cm_response_timeout = 20;
666 req->param.local_cm_response_timeout = 20;
667 req->param.retry_count = target->tl_retry_count;
668 req->param.rnr_retry_count = 7;
669 req->param.max_cm_retries = 15;
670
671 req->priv.opcode = SRP_LOGIN_REQ;
672 req->priv.tag = 0;
673 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
674 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
675 SRP_BUF_FORMAT_INDIRECT);
676 /*
677 * In the published SRP specification (draft rev. 16a), the
678 * port identifier format is 8 bytes of ID extension followed
679 * by 8 bytes of GUID. Older drafts put the two halves in the
680 * opposite order, so that the GUID comes first.
681 *
682 * Targets conforming to these obsolete drafts can be
683 * recognized by the I/O Class they report.
684 */
685 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
686 memcpy(req->priv.initiator_port_id,
687 &target->path.sgid.global.interface_id, 8);
688 memcpy(req->priv.initiator_port_id + 8,
689 &target->initiator_ext, 8);
690 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
691 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
692 } else {
693 memcpy(req->priv.initiator_port_id,
694 &target->initiator_ext, 8);
695 memcpy(req->priv.initiator_port_id + 8,
696 &target->path.sgid.global.interface_id, 8);
697 memcpy(req->priv.target_port_id, &target->id_ext, 8);
698 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
699 }
700
701 /*
702 * Topspin/Cisco SRP targets will reject our login unless we
703 * zero out the first 8 bytes of our initiator port ID and set
704 * the second 8 bytes to the local node GUID.
705 */
706 if (srp_target_is_topspin(target)) {
707 shost_printk(KERN_DEBUG, target->scsi_host,
708 PFX "Topspin/Cisco initiator port ID workaround "
709 "activated for target GUID %016llx\n",
710 (unsigned long long) be64_to_cpu(target->ioc_guid));
711 memset(req->priv.initiator_port_id, 0, 8);
712 memcpy(req->priv.initiator_port_id + 8,
713 &target->srp_host->srp_dev->dev->node_guid, 8);
714 }
715
716 status = ib_send_cm_req(target->cm_id, &req->param);
717
718 kfree(req);
719
720 return status;
721 }
722
723 static bool srp_queue_remove_work(struct srp_target_port *target)
724 {
725 bool changed = false;
726
727 spin_lock_irq(&target->lock);
728 if (target->state != SRP_TARGET_REMOVED) {
729 target->state = SRP_TARGET_REMOVED;
730 changed = true;
731 }
732 spin_unlock_irq(&target->lock);
733
734 if (changed)
735 queue_work(srp_remove_wq, &target->remove_work);
736
737 return changed;
738 }
739
740 static bool srp_change_conn_state(struct srp_target_port *target,
741 bool connected)
742 {
743 bool changed = false;
744
745 spin_lock_irq(&target->lock);
746 if (target->connected != connected) {
747 target->connected = connected;
748 changed = true;
749 }
750 spin_unlock_irq(&target->lock);
751
752 return changed;
753 }
754
755 static void srp_disconnect_target(struct srp_target_port *target)
756 {
757 if (srp_change_conn_state(target, false)) {
758 /* XXX should send SRP_I_LOGOUT request */
759
760 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
761 shost_printk(KERN_DEBUG, target->scsi_host,
762 PFX "Sending CM DREQ failed\n");
763 }
764 }
765 }
766
767 static void srp_free_req_data(struct srp_target_port *target)
768 {
769 struct srp_device *dev = target->srp_host->srp_dev;
770 struct ib_device *ibdev = dev->dev;
771 struct srp_request *req;
772 int i;
773
774 if (!target->req_ring)
775 return;
776
777 for (i = 0; i < target->req_ring_size; ++i) {
778 req = &target->req_ring[i];
779 if (dev->use_fast_reg)
780 kfree(req->fr_list);
781 else
782 kfree(req->fmr_list);
783 kfree(req->map_page);
784 if (req->indirect_dma_addr) {
785 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
786 target->indirect_size,
787 DMA_TO_DEVICE);
788 }
789 kfree(req->indirect_desc);
790 }
791
792 kfree(target->req_ring);
793 target->req_ring = NULL;
794 }
795
796 static int srp_alloc_req_data(struct srp_target_port *target)
797 {
798 struct srp_device *srp_dev = target->srp_host->srp_dev;
799 struct ib_device *ibdev = srp_dev->dev;
800 struct srp_request *req;
801 void *mr_list;
802 dma_addr_t dma_addr;
803 int i, ret = -ENOMEM;
804
805 INIT_LIST_HEAD(&target->free_reqs);
806
807 target->req_ring = kzalloc(target->req_ring_size *
808 sizeof(*target->req_ring), GFP_KERNEL);
809 if (!target->req_ring)
810 goto out;
811
812 for (i = 0; i < target->req_ring_size; ++i) {
813 req = &target->req_ring[i];
814 mr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
815 GFP_KERNEL);
816 if (!mr_list)
817 goto out;
818 if (srp_dev->use_fast_reg)
819 req->fr_list = mr_list;
820 else
821 req->fmr_list = mr_list;
822 req->map_page = kmalloc(srp_dev->max_pages_per_mr *
823 sizeof(void *), GFP_KERNEL);
824 if (!req->map_page)
825 goto out;
826 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
827 if (!req->indirect_desc)
828 goto out;
829
830 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
831 target->indirect_size,
832 DMA_TO_DEVICE);
833 if (ib_dma_mapping_error(ibdev, dma_addr))
834 goto out;
835
836 req->indirect_dma_addr = dma_addr;
837 req->index = i;
838 list_add_tail(&req->list, &target->free_reqs);
839 }
840 ret = 0;
841
842 out:
843 return ret;
844 }
845
846 /**
847 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
848 * @shost: SCSI host whose attributes to remove from sysfs.
849 *
850 * Note: Any attributes defined in the host template and that did not exist
851 * before invocation of this function will be ignored.
852 */
853 static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
854 {
855 struct device_attribute **attr;
856
857 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
858 device_remove_file(&shost->shost_dev, *attr);
859 }
860
861 static void srp_remove_target(struct srp_target_port *target)
862 {
863 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
864
865 srp_del_scsi_host_attr(target->scsi_host);
866 srp_rport_get(target->rport);
867 srp_remove_host(target->scsi_host);
868 scsi_remove_host(target->scsi_host);
869 srp_stop_rport_timers(target->rport);
870 srp_disconnect_target(target);
871 ib_destroy_cm_id(target->cm_id);
872 srp_free_target_ib(target);
873 cancel_work_sync(&target->tl_err_work);
874 srp_rport_put(target->rport);
875 srp_free_req_data(target);
876
877 spin_lock(&target->srp_host->target_lock);
878 list_del(&target->list);
879 spin_unlock(&target->srp_host->target_lock);
880
881 scsi_host_put(target->scsi_host);
882 }
883
884 static void srp_remove_work(struct work_struct *work)
885 {
886 struct srp_target_port *target =
887 container_of(work, struct srp_target_port, remove_work);
888
889 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
890
891 srp_remove_target(target);
892 }
893
894 static void srp_rport_delete(struct srp_rport *rport)
895 {
896 struct srp_target_port *target = rport->lld_data;
897
898 srp_queue_remove_work(target);
899 }
900
901 static int srp_connect_target(struct srp_target_port *target)
902 {
903 int retries = 3;
904 int ret;
905
906 WARN_ON_ONCE(target->connected);
907
908 target->qp_in_error = false;
909
910 ret = srp_lookup_path(target);
911 if (ret)
912 return ret;
913
914 while (1) {
915 init_completion(&target->done);
916 ret = srp_send_req(target);
917 if (ret)
918 return ret;
919 ret = wait_for_completion_interruptible(&target->done);
920 if (ret < 0)
921 return ret;
922
923 /*
924 * The CM event handling code will set status to
925 * SRP_PORT_REDIRECT if we get a port redirect REJ
926 * back, or SRP_DLID_REDIRECT if we get a lid/qp
927 * redirect REJ back.
928 */
929 switch (target->status) {
930 case 0:
931 srp_change_conn_state(target, true);
932 return 0;
933
934 case SRP_PORT_REDIRECT:
935 ret = srp_lookup_path(target);
936 if (ret)
937 return ret;
938 break;
939
940 case SRP_DLID_REDIRECT:
941 break;
942
943 case SRP_STALE_CONN:
944 /* Our current CM id was stale, and is now in timewait.
945 * Try to reconnect with a new one.
946 */
947 if (!retries-- || srp_new_cm_id(target)) {
948 shost_printk(KERN_ERR, target->scsi_host, PFX
949 "giving up on stale connection\n");
950 target->status = -ECONNRESET;
951 return target->status;
952 }
953
954 shost_printk(KERN_ERR, target->scsi_host, PFX
955 "retrying stale connection\n");
956 break;
957
958 default:
959 return target->status;
960 }
961 }
962 }
963
964 static int srp_inv_rkey(struct srp_target_port *target, u32 rkey)
965 {
966 struct ib_send_wr *bad_wr;
967 struct ib_send_wr wr = {
968 .opcode = IB_WR_LOCAL_INV,
969 .wr_id = LOCAL_INV_WR_ID_MASK,
970 .next = NULL,
971 .num_sge = 0,
972 .send_flags = 0,
973 .ex.invalidate_rkey = rkey,
974 };
975
976 return ib_post_send(target->qp, &wr, &bad_wr);
977 }
978
979 static void srp_unmap_data(struct scsi_cmnd *scmnd,
980 struct srp_target_port *target,
981 struct srp_request *req)
982 {
983 struct srp_device *dev = target->srp_host->srp_dev;
984 struct ib_device *ibdev = dev->dev;
985 int i, res;
986
987 if (!scsi_sglist(scmnd) ||
988 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
989 scmnd->sc_data_direction != DMA_FROM_DEVICE))
990 return;
991
992 if (dev->use_fast_reg) {
993 struct srp_fr_desc **pfr;
994
995 for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) {
996 res = srp_inv_rkey(target, (*pfr)->mr->rkey);
997 if (res < 0) {
998 shost_printk(KERN_ERR, target->scsi_host, PFX
999 "Queueing INV WR for rkey %#x failed (%d)\n",
1000 (*pfr)->mr->rkey, res);
1001 queue_work(system_long_wq,
1002 &target->tl_err_work);
1003 }
1004 }
1005 if (req->nmdesc)
1006 srp_fr_pool_put(target->fr_pool, req->fr_list,
1007 req->nmdesc);
1008 } else {
1009 struct ib_pool_fmr **pfmr;
1010
1011 for (i = req->nmdesc, pfmr = req->fmr_list; i > 0; i--, pfmr++)
1012 ib_fmr_pool_unmap(*pfmr);
1013 }
1014
1015 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
1016 scmnd->sc_data_direction);
1017 }
1018
1019 /**
1020 * srp_claim_req - Take ownership of the scmnd associated with a request.
1021 * @target: SRP target port.
1022 * @req: SRP request.
1023 * @sdev: If not NULL, only take ownership for this SCSI device.
1024 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
1025 * ownership of @req->scmnd if it equals @scmnd.
1026 *
1027 * Return value:
1028 * Either NULL or a pointer to the SCSI command the caller became owner of.
1029 */
1030 static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
1031 struct srp_request *req,
1032 struct scsi_device *sdev,
1033 struct scsi_cmnd *scmnd)
1034 {
1035 unsigned long flags;
1036
1037 spin_lock_irqsave(&target->lock, flags);
1038 if (req->scmnd &&
1039 (!sdev || req->scmnd->device == sdev) &&
1040 (!scmnd || req->scmnd == scmnd)) {
1041 scmnd = req->scmnd;
1042 req->scmnd = NULL;
1043 } else {
1044 scmnd = NULL;
1045 }
1046 spin_unlock_irqrestore(&target->lock, flags);
1047
1048 return scmnd;
1049 }
1050
1051 /**
1052 * srp_free_req() - Unmap data and add request to the free request list.
1053 * @target: SRP target port.
1054 * @req: Request to be freed.
1055 * @scmnd: SCSI command associated with @req.
1056 * @req_lim_delta: Amount to be added to @target->req_lim.
1057 */
1058 static void srp_free_req(struct srp_target_port *target,
1059 struct srp_request *req, struct scsi_cmnd *scmnd,
1060 s32 req_lim_delta)
1061 {
1062 unsigned long flags;
1063
1064 srp_unmap_data(scmnd, target, req);
1065
1066 spin_lock_irqsave(&target->lock, flags);
1067 target->req_lim += req_lim_delta;
1068 list_add_tail(&req->list, &target->free_reqs);
1069 spin_unlock_irqrestore(&target->lock, flags);
1070 }
1071
1072 static void srp_finish_req(struct srp_target_port *target,
1073 struct srp_request *req, struct scsi_device *sdev,
1074 int result)
1075 {
1076 struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
1077
1078 if (scmnd) {
1079 srp_free_req(target, req, scmnd, 0);
1080 scmnd->result = result;
1081 scmnd->scsi_done(scmnd);
1082 }
1083 }
1084
1085 static void srp_terminate_io(struct srp_rport *rport)
1086 {
1087 struct srp_target_port *target = rport->lld_data;
1088 struct Scsi_Host *shost = target->scsi_host;
1089 struct scsi_device *sdev;
1090 int i;
1091
1092 /*
1093 * Invoking srp_terminate_io() while srp_queuecommand() is running
1094 * is not safe. Hence the warning statement below.
1095 */
1096 shost_for_each_device(sdev, shost)
1097 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
1098
1099 for (i = 0; i < target->req_ring_size; ++i) {
1100 struct srp_request *req = &target->req_ring[i];
1101 srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
1102 }
1103 }
1104
1105 /*
1106 * It is up to the caller to ensure that srp_rport_reconnect() calls are
1107 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
1108 * srp_reset_device() or srp_reset_host() calls will occur while this function
1109 * is in progress. One way to realize that is not to call this function
1110 * directly but to call srp_reconnect_rport() instead since that last function
1111 * serializes calls of this function via rport->mutex and also blocks
1112 * srp_queuecommand() calls before invoking this function.
1113 */
1114 static int srp_rport_reconnect(struct srp_rport *rport)
1115 {
1116 struct srp_target_port *target = rport->lld_data;
1117 int i, ret;
1118
1119 srp_disconnect_target(target);
1120 /*
1121 * Now get a new local CM ID so that we avoid confusing the target in
1122 * case things are really fouled up. Doing so also ensures that all CM
1123 * callbacks will have finished before a new QP is allocated.
1124 */
1125 ret = srp_new_cm_id(target);
1126
1127 for (i = 0; i < target->req_ring_size; ++i) {
1128 struct srp_request *req = &target->req_ring[i];
1129 srp_finish_req(target, req, NULL, DID_RESET << 16);
1130 }
1131
1132 /*
1133 * Whether or not creating a new CM ID succeeded, create a new
1134 * QP. This guarantees that all callback functions for the old QP have
1135 * finished before any send requests are posted on the new QP.
1136 */
1137 ret += srp_create_target_ib(target);
1138
1139 INIT_LIST_HEAD(&target->free_tx);
1140 for (i = 0; i < target->queue_size; ++i)
1141 list_add(&target->tx_ring[i]->list, &target->free_tx);
1142
1143 if (ret == 0)
1144 ret = srp_connect_target(target);
1145
1146 if (ret == 0)
1147 shost_printk(KERN_INFO, target->scsi_host,
1148 PFX "reconnect succeeded\n");
1149
1150 return ret;
1151 }
1152
1153 static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
1154 unsigned int dma_len, u32 rkey)
1155 {
1156 struct srp_direct_buf *desc = state->desc;
1157
1158 desc->va = cpu_to_be64(dma_addr);
1159 desc->key = cpu_to_be32(rkey);
1160 desc->len = cpu_to_be32(dma_len);
1161
1162 state->total_len += dma_len;
1163 state->desc++;
1164 state->ndesc++;
1165 }
1166
1167 static int srp_map_finish_fmr(struct srp_map_state *state,
1168 struct srp_target_port *target)
1169 {
1170 struct ib_pool_fmr *fmr;
1171 u64 io_addr = 0;
1172
1173 fmr = ib_fmr_pool_map_phys(target->fmr_pool, state->pages,
1174 state->npages, io_addr);
1175 if (IS_ERR(fmr))
1176 return PTR_ERR(fmr);
1177
1178 *state->next_fmr++ = fmr;
1179 state->nmdesc++;
1180
1181 srp_map_desc(state, 0, state->dma_len, fmr->fmr->rkey);
1182
1183 return 0;
1184 }
1185
1186 static int srp_map_finish_fr(struct srp_map_state *state,
1187 struct srp_target_port *target)
1188 {
1189 struct srp_device *dev = target->srp_host->srp_dev;
1190 struct ib_send_wr *bad_wr;
1191 struct ib_send_wr wr;
1192 struct srp_fr_desc *desc;
1193 u32 rkey;
1194
1195 desc = srp_fr_pool_get(target->fr_pool);
1196 if (!desc)
1197 return -ENOMEM;
1198
1199 rkey = ib_inc_rkey(desc->mr->rkey);
1200 ib_update_fast_reg_key(desc->mr, rkey);
1201
1202 memcpy(desc->frpl->page_list, state->pages,
1203 sizeof(state->pages[0]) * state->npages);
1204
1205 memset(&wr, 0, sizeof(wr));
1206 wr.opcode = IB_WR_FAST_REG_MR;
1207 wr.wr_id = FAST_REG_WR_ID_MASK;
1208 wr.wr.fast_reg.iova_start = state->base_dma_addr;
1209 wr.wr.fast_reg.page_list = desc->frpl;
1210 wr.wr.fast_reg.page_list_len = state->npages;
1211 wr.wr.fast_reg.page_shift = ilog2(dev->mr_page_size);
1212 wr.wr.fast_reg.length = state->dma_len;
1213 wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
1214 IB_ACCESS_REMOTE_READ |
1215 IB_ACCESS_REMOTE_WRITE);
1216 wr.wr.fast_reg.rkey = desc->mr->lkey;
1217
1218 *state->next_fr++ = desc;
1219 state->nmdesc++;
1220
1221 srp_map_desc(state, state->base_dma_addr, state->dma_len,
1222 desc->mr->rkey);
1223
1224 return ib_post_send(target->qp, &wr, &bad_wr);
1225 }
1226
1227 static int srp_finish_mapping(struct srp_map_state *state,
1228 struct srp_target_port *target)
1229 {
1230 int ret = 0;
1231
1232 if (state->npages == 0)
1233 return 0;
1234
1235 if (state->npages == 1 && !register_always)
1236 srp_map_desc(state, state->base_dma_addr, state->dma_len,
1237 target->rkey);
1238 else
1239 ret = target->srp_host->srp_dev->use_fast_reg ?
1240 srp_map_finish_fr(state, target) :
1241 srp_map_finish_fmr(state, target);
1242
1243 if (ret == 0) {
1244 state->npages = 0;
1245 state->dma_len = 0;
1246 }
1247
1248 return ret;
1249 }
1250
1251 static void srp_map_update_start(struct srp_map_state *state,
1252 struct scatterlist *sg, int sg_index,
1253 dma_addr_t dma_addr)
1254 {
1255 state->unmapped_sg = sg;
1256 state->unmapped_index = sg_index;
1257 state->unmapped_addr = dma_addr;
1258 }
1259
1260 static int srp_map_sg_entry(struct srp_map_state *state,
1261 struct srp_target_port *target,
1262 struct scatterlist *sg, int sg_index,
1263 bool use_mr)
1264 {
1265 struct srp_device *dev = target->srp_host->srp_dev;
1266 struct ib_device *ibdev = dev->dev;
1267 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
1268 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
1269 unsigned int len;
1270 int ret;
1271
1272 if (!dma_len)
1273 return 0;
1274
1275 if (!use_mr) {
1276 /*
1277 * Once we're in direct map mode for a request, we don't
1278 * go back to FMR or FR mode, so no need to update anything
1279 * other than the descriptor.
1280 */
1281 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1282 return 0;
1283 }
1284
1285 /*
1286 * Since not all RDMA HW drivers support non-zero page offsets for
1287 * FMR, if we start at an offset into a page, don't merge into the
1288 * current FMR mapping. Finish it out, and use the kernel's MR for
1289 * this sg entry.
1290 */
1291 if ((!dev->use_fast_reg && dma_addr & ~dev->mr_page_mask) ||
1292 dma_len > dev->mr_max_size) {
1293 ret = srp_finish_mapping(state, target);
1294 if (ret)
1295 return ret;
1296
1297 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1298 srp_map_update_start(state, NULL, 0, 0);
1299 return 0;
1300 }
1301
1302 /*
1303 * If this is the first sg that will be mapped via FMR or via FR, save
1304 * our position. We need to know the first unmapped entry, its index,
1305 * and the first unmapped address within that entry to be able to
1306 * restart mapping after an error.
1307 */
1308 if (!state->unmapped_sg)
1309 srp_map_update_start(state, sg, sg_index, dma_addr);
1310
1311 while (dma_len) {
1312 unsigned offset = dma_addr & ~dev->mr_page_mask;
1313 if (state->npages == dev->max_pages_per_mr || offset != 0) {
1314 ret = srp_finish_mapping(state, target);
1315 if (ret)
1316 return ret;
1317
1318 srp_map_update_start(state, sg, sg_index, dma_addr);
1319 }
1320
1321 len = min_t(unsigned int, dma_len, dev->mr_page_size - offset);
1322
1323 if (!state->npages)
1324 state->base_dma_addr = dma_addr;
1325 state->pages[state->npages++] = dma_addr & dev->mr_page_mask;
1326 state->dma_len += len;
1327 dma_addr += len;
1328 dma_len -= len;
1329 }
1330
1331 /*
1332 * If the last entry of the MR wasn't a full page, then we need to
1333 * close it out and start a new one -- we can only merge at page
1334 * boundries.
1335 */
1336 ret = 0;
1337 if (len != dev->mr_page_size) {
1338 ret = srp_finish_mapping(state, target);
1339 if (!ret)
1340 srp_map_update_start(state, NULL, 0, 0);
1341 }
1342 return ret;
1343 }
1344
1345 static int srp_map_sg(struct srp_map_state *state,
1346 struct srp_target_port *target, struct srp_request *req,
1347 struct scatterlist *scat, int count)
1348 {
1349 struct srp_device *dev = target->srp_host->srp_dev;
1350 struct ib_device *ibdev = dev->dev;
1351 struct scatterlist *sg;
1352 int i;
1353 bool use_mr;
1354
1355 state->desc = req->indirect_desc;
1356 state->pages = req->map_page;
1357 if (dev->use_fast_reg) {
1358 state->next_fr = req->fr_list;
1359 use_mr = !!target->fr_pool;
1360 } else {
1361 state->next_fmr = req->fmr_list;
1362 use_mr = !!target->fmr_pool;
1363 }
1364
1365 for_each_sg(scat, sg, count, i) {
1366 if (srp_map_sg_entry(state, target, sg, i, use_mr)) {
1367 /*
1368 * Memory registration failed, so backtrack to the
1369 * first unmapped entry and continue on without using
1370 * memory registration.
1371 */
1372 dma_addr_t dma_addr;
1373 unsigned int dma_len;
1374
1375 backtrack:
1376 sg = state->unmapped_sg;
1377 i = state->unmapped_index;
1378
1379 dma_addr = ib_sg_dma_address(ibdev, sg);
1380 dma_len = ib_sg_dma_len(ibdev, sg);
1381 dma_len -= (state->unmapped_addr - dma_addr);
1382 dma_addr = state->unmapped_addr;
1383 use_mr = false;
1384 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1385 }
1386 }
1387
1388 if (use_mr && srp_finish_mapping(state, target))
1389 goto backtrack;
1390
1391 req->nmdesc = state->nmdesc;
1392
1393 return 0;
1394 }
1395
1396 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
1397 struct srp_request *req)
1398 {
1399 struct scatterlist *scat;
1400 struct srp_cmd *cmd = req->cmd->buf;
1401 int len, nents, count;
1402 struct srp_device *dev;
1403 struct ib_device *ibdev;
1404 struct srp_map_state state;
1405 struct srp_indirect_buf *indirect_hdr;
1406 u32 table_len;
1407 u8 fmt;
1408
1409 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
1410 return sizeof (struct srp_cmd);
1411
1412 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1413 scmnd->sc_data_direction != DMA_TO_DEVICE) {
1414 shost_printk(KERN_WARNING, target->scsi_host,
1415 PFX "Unhandled data direction %d\n",
1416 scmnd->sc_data_direction);
1417 return -EINVAL;
1418 }
1419
1420 nents = scsi_sg_count(scmnd);
1421 scat = scsi_sglist(scmnd);
1422
1423 dev = target->srp_host->srp_dev;
1424 ibdev = dev->dev;
1425
1426 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
1427 if (unlikely(count == 0))
1428 return -EIO;
1429
1430 fmt = SRP_DATA_DESC_DIRECT;
1431 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
1432
1433 if (count == 1 && !register_always) {
1434 /*
1435 * The midlayer only generated a single gather/scatter
1436 * entry, or DMA mapping coalesced everything to a
1437 * single entry. So a direct descriptor along with
1438 * the DMA MR suffices.
1439 */
1440 struct srp_direct_buf *buf = (void *) cmd->add_data;
1441
1442 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
1443 buf->key = cpu_to_be32(target->rkey);
1444 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
1445
1446 req->nmdesc = 0;
1447 goto map_complete;
1448 }
1449
1450 /*
1451 * We have more than one scatter/gather entry, so build our indirect
1452 * descriptor table, trying to merge as many entries as we can.
1453 */
1454 indirect_hdr = (void *) cmd->add_data;
1455
1456 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1457 target->indirect_size, DMA_TO_DEVICE);
1458
1459 memset(&state, 0, sizeof(state));
1460 srp_map_sg(&state, target, req, scat, count);
1461
1462 /* We've mapped the request, now pull as much of the indirect
1463 * descriptor table as we can into the command buffer. If this
1464 * target is not using an external indirect table, we are
1465 * guaranteed to fit into the command, as the SCSI layer won't
1466 * give us more S/G entries than we allow.
1467 */
1468 if (state.ndesc == 1) {
1469 /*
1470 * Memory registration collapsed the sg-list into one entry,
1471 * so use a direct descriptor.
1472 */
1473 struct srp_direct_buf *buf = (void *) cmd->add_data;
1474
1475 *buf = req->indirect_desc[0];
1476 goto map_complete;
1477 }
1478
1479 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1480 !target->allow_ext_sg)) {
1481 shost_printk(KERN_ERR, target->scsi_host,
1482 "Could not fit S/G list into SRP_CMD\n");
1483 return -EIO;
1484 }
1485
1486 count = min(state.ndesc, target->cmd_sg_cnt);
1487 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1488
1489 fmt = SRP_DATA_DESC_INDIRECT;
1490 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
1491 len += count * sizeof (struct srp_direct_buf);
1492
1493 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1494 count * sizeof (struct srp_direct_buf));
1495
1496 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1497 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1498 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1499 indirect_hdr->len = cpu_to_be32(state.total_len);
1500
1501 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1502 cmd->data_out_desc_cnt = count;
1503 else
1504 cmd->data_in_desc_cnt = count;
1505
1506 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1507 DMA_TO_DEVICE);
1508
1509 map_complete:
1510 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1511 cmd->buf_fmt = fmt << 4;
1512 else
1513 cmd->buf_fmt = fmt;
1514
1515 return len;
1516 }
1517
1518 /*
1519 * Return an IU and possible credit to the free pool
1520 */
1521 static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1522 enum srp_iu_type iu_type)
1523 {
1524 unsigned long flags;
1525
1526 spin_lock_irqsave(&target->lock, flags);
1527 list_add(&iu->list, &target->free_tx);
1528 if (iu_type != SRP_IU_RSP)
1529 ++target->req_lim;
1530 spin_unlock_irqrestore(&target->lock, flags);
1531 }
1532
1533 /*
1534 * Must be called with target->lock held to protect req_lim and free_tx.
1535 * If IU is not sent, it must be returned using srp_put_tx_iu().
1536 *
1537 * Note:
1538 * An upper limit for the number of allocated information units for each
1539 * request type is:
1540 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1541 * more than Scsi_Host.can_queue requests.
1542 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1543 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1544 * one unanswered SRP request to an initiator.
1545 */
1546 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1547 enum srp_iu_type iu_type)
1548 {
1549 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1550 struct srp_iu *iu;
1551
1552 srp_send_completion(target->send_cq, target);
1553
1554 if (list_empty(&target->free_tx))
1555 return NULL;
1556
1557 /* Initiator responses to target requests do not consume credits */
1558 if (iu_type != SRP_IU_RSP) {
1559 if (target->req_lim <= rsv) {
1560 ++target->zero_req_lim;
1561 return NULL;
1562 }
1563
1564 --target->req_lim;
1565 }
1566
1567 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
1568 list_del(&iu->list);
1569 return iu;
1570 }
1571
1572 static int srp_post_send(struct srp_target_port *target,
1573 struct srp_iu *iu, int len)
1574 {
1575 struct ib_sge list;
1576 struct ib_send_wr wr, *bad_wr;
1577
1578 list.addr = iu->dma;
1579 list.length = len;
1580 list.lkey = target->lkey;
1581
1582 wr.next = NULL;
1583 wr.wr_id = (uintptr_t) iu;
1584 wr.sg_list = &list;
1585 wr.num_sge = 1;
1586 wr.opcode = IB_WR_SEND;
1587 wr.send_flags = IB_SEND_SIGNALED;
1588
1589 return ib_post_send(target->qp, &wr, &bad_wr);
1590 }
1591
1592 static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
1593 {
1594 struct ib_recv_wr wr, *bad_wr;
1595 struct ib_sge list;
1596
1597 list.addr = iu->dma;
1598 list.length = iu->size;
1599 list.lkey = target->lkey;
1600
1601 wr.next = NULL;
1602 wr.wr_id = (uintptr_t) iu;
1603 wr.sg_list = &list;
1604 wr.num_sge = 1;
1605
1606 return ib_post_recv(target->qp, &wr, &bad_wr);
1607 }
1608
1609 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1610 {
1611 struct srp_request *req;
1612 struct scsi_cmnd *scmnd;
1613 unsigned long flags;
1614
1615 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
1616 spin_lock_irqsave(&target->lock, flags);
1617 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1618 spin_unlock_irqrestore(&target->lock, flags);
1619
1620 target->tsk_mgmt_status = -1;
1621 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1622 target->tsk_mgmt_status = rsp->data[3];
1623 complete(&target->tsk_mgmt_done);
1624 } else {
1625 req = &target->req_ring[rsp->tag];
1626 scmnd = srp_claim_req(target, req, NULL, NULL);
1627 if (!scmnd) {
1628 shost_printk(KERN_ERR, target->scsi_host,
1629 "Null scmnd for RSP w/tag %016llx\n",
1630 (unsigned long long) rsp->tag);
1631
1632 spin_lock_irqsave(&target->lock, flags);
1633 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1634 spin_unlock_irqrestore(&target->lock, flags);
1635
1636 return;
1637 }
1638 scmnd->result = rsp->status;
1639
1640 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1641 memcpy(scmnd->sense_buffer, rsp->data +
1642 be32_to_cpu(rsp->resp_data_len),
1643 min_t(int, be32_to_cpu(rsp->sense_data_len),
1644 SCSI_SENSE_BUFFERSIZE));
1645 }
1646
1647 if (unlikely(rsp->flags & SRP_RSP_FLAG_DIUNDER))
1648 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
1649 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DIOVER))
1650 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_in_res_cnt));
1651 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOUNDER))
1652 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1653 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOOVER))
1654 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_out_res_cnt));
1655
1656 srp_free_req(target, req, scmnd,
1657 be32_to_cpu(rsp->req_lim_delta));
1658
1659 scmnd->host_scribble = NULL;
1660 scmnd->scsi_done(scmnd);
1661 }
1662 }
1663
1664 static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1665 void *rsp, int len)
1666 {
1667 struct ib_device *dev = target->srp_host->srp_dev->dev;
1668 unsigned long flags;
1669 struct srp_iu *iu;
1670 int err;
1671
1672 spin_lock_irqsave(&target->lock, flags);
1673 target->req_lim += req_delta;
1674 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
1675 spin_unlock_irqrestore(&target->lock, flags);
1676
1677 if (!iu) {
1678 shost_printk(KERN_ERR, target->scsi_host, PFX
1679 "no IU available to send response\n");
1680 return 1;
1681 }
1682
1683 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1684 memcpy(iu->buf, rsp, len);
1685 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1686
1687 err = srp_post_send(target, iu, len);
1688 if (err) {
1689 shost_printk(KERN_ERR, target->scsi_host, PFX
1690 "unable to post response: %d\n", err);
1691 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1692 }
1693
1694 return err;
1695 }
1696
1697 static void srp_process_cred_req(struct srp_target_port *target,
1698 struct srp_cred_req *req)
1699 {
1700 struct srp_cred_rsp rsp = {
1701 .opcode = SRP_CRED_RSP,
1702 .tag = req->tag,
1703 };
1704 s32 delta = be32_to_cpu(req->req_lim_delta);
1705
1706 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1707 shost_printk(KERN_ERR, target->scsi_host, PFX
1708 "problems processing SRP_CRED_REQ\n");
1709 }
1710
1711 static void srp_process_aer_req(struct srp_target_port *target,
1712 struct srp_aer_req *req)
1713 {
1714 struct srp_aer_rsp rsp = {
1715 .opcode = SRP_AER_RSP,
1716 .tag = req->tag,
1717 };
1718 s32 delta = be32_to_cpu(req->req_lim_delta);
1719
1720 shost_printk(KERN_ERR, target->scsi_host, PFX
1721 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1722
1723 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1724 shost_printk(KERN_ERR, target->scsi_host, PFX
1725 "problems processing SRP_AER_REQ\n");
1726 }
1727
1728 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1729 {
1730 struct ib_device *dev = target->srp_host->srp_dev->dev;
1731 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
1732 int res;
1733 u8 opcode;
1734
1735 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1736 DMA_FROM_DEVICE);
1737
1738 opcode = *(u8 *) iu->buf;
1739
1740 if (0) {
1741 shost_printk(KERN_ERR, target->scsi_host,
1742 PFX "recv completion, opcode 0x%02x\n", opcode);
1743 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1744 iu->buf, wc->byte_len, true);
1745 }
1746
1747 switch (opcode) {
1748 case SRP_RSP:
1749 srp_process_rsp(target, iu->buf);
1750 break;
1751
1752 case SRP_CRED_REQ:
1753 srp_process_cred_req(target, iu->buf);
1754 break;
1755
1756 case SRP_AER_REQ:
1757 srp_process_aer_req(target, iu->buf);
1758 break;
1759
1760 case SRP_T_LOGOUT:
1761 /* XXX Handle target logout */
1762 shost_printk(KERN_WARNING, target->scsi_host,
1763 PFX "Got target logout request\n");
1764 break;
1765
1766 default:
1767 shost_printk(KERN_WARNING, target->scsi_host,
1768 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1769 break;
1770 }
1771
1772 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1773 DMA_FROM_DEVICE);
1774
1775 res = srp_post_recv(target, iu);
1776 if (res != 0)
1777 shost_printk(KERN_ERR, target->scsi_host,
1778 PFX "Recv failed with error code %d\n", res);
1779 }
1780
1781 /**
1782 * srp_tl_err_work() - handle a transport layer error
1783 * @work: Work structure embedded in an SRP target port.
1784 *
1785 * Note: This function may get invoked before the rport has been created,
1786 * hence the target->rport test.
1787 */
1788 static void srp_tl_err_work(struct work_struct *work)
1789 {
1790 struct srp_target_port *target;
1791
1792 target = container_of(work, struct srp_target_port, tl_err_work);
1793 if (target->rport)
1794 srp_start_tl_fail_timers(target->rport);
1795 }
1796
1797 static void srp_handle_qp_err(u64 wr_id, enum ib_wc_status wc_status,
1798 bool send_err, struct srp_target_port *target)
1799 {
1800 if (target->connected && !target->qp_in_error) {
1801 if (wr_id & LOCAL_INV_WR_ID_MASK) {
1802 shost_printk(KERN_ERR, target->scsi_host, PFX
1803 "LOCAL_INV failed with status %d\n",
1804 wc_status);
1805 } else if (wr_id & FAST_REG_WR_ID_MASK) {
1806 shost_printk(KERN_ERR, target->scsi_host, PFX
1807 "FAST_REG_MR failed status %d\n",
1808 wc_status);
1809 } else {
1810 shost_printk(KERN_ERR, target->scsi_host,
1811 PFX "failed %s status %d for iu %p\n",
1812 send_err ? "send" : "receive",
1813 wc_status, (void *)(uintptr_t)wr_id);
1814 }
1815 queue_work(system_long_wq, &target->tl_err_work);
1816 }
1817 target->qp_in_error = true;
1818 }
1819
1820 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1821 {
1822 struct srp_target_port *target = target_ptr;
1823 struct ib_wc wc;
1824
1825 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1826 while (ib_poll_cq(cq, 1, &wc) > 0) {
1827 if (likely(wc.status == IB_WC_SUCCESS)) {
1828 srp_handle_recv(target, &wc);
1829 } else {
1830 srp_handle_qp_err(wc.wr_id, wc.status, false, target);
1831 }
1832 }
1833 }
1834
1835 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1836 {
1837 struct srp_target_port *target = target_ptr;
1838 struct ib_wc wc;
1839 struct srp_iu *iu;
1840
1841 while (ib_poll_cq(cq, 1, &wc) > 0) {
1842 if (likely(wc.status == IB_WC_SUCCESS)) {
1843 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1844 list_add(&iu->list, &target->free_tx);
1845 } else {
1846 srp_handle_qp_err(wc.wr_id, wc.status, true, target);
1847 }
1848 }
1849 }
1850
1851 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1852 {
1853 struct srp_target_port *target = host_to_target(shost);
1854 struct srp_rport *rport = target->rport;
1855 struct srp_request *req;
1856 struct srp_iu *iu;
1857 struct srp_cmd *cmd;
1858 struct ib_device *dev;
1859 unsigned long flags;
1860 int len, ret;
1861 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1862
1863 /*
1864 * The SCSI EH thread is the only context from which srp_queuecommand()
1865 * can get invoked for blocked devices (SDEV_BLOCK /
1866 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1867 * locking the rport mutex if invoked from inside the SCSI EH.
1868 */
1869 if (in_scsi_eh)
1870 mutex_lock(&rport->mutex);
1871
1872 scmnd->result = srp_chkready(target->rport);
1873 if (unlikely(scmnd->result))
1874 goto err;
1875
1876 spin_lock_irqsave(&target->lock, flags);
1877 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1878 if (!iu)
1879 goto err_unlock;
1880
1881 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1882 list_del(&req->list);
1883 spin_unlock_irqrestore(&target->lock, flags);
1884
1885 dev = target->srp_host->srp_dev->dev;
1886 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
1887 DMA_TO_DEVICE);
1888
1889 scmnd->host_scribble = (void *) req;
1890
1891 cmd = iu->buf;
1892 memset(cmd, 0, sizeof *cmd);
1893
1894 cmd->opcode = SRP_CMD;
1895 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1896 cmd->tag = req->index;
1897 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1898
1899 req->scmnd = scmnd;
1900 req->cmd = iu;
1901
1902 len = srp_map_data(scmnd, target, req);
1903 if (len < 0) {
1904 shost_printk(KERN_ERR, target->scsi_host,
1905 PFX "Failed to map data (%d)\n", len);
1906 /*
1907 * If we ran out of memory descriptors (-ENOMEM) because an
1908 * application is queuing many requests with more than
1909 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
1910 * to reduce queue depth temporarily.
1911 */
1912 scmnd->result = len == -ENOMEM ?
1913 DID_OK << 16 | QUEUE_FULL << 1 : DID_ERROR << 16;
1914 goto err_iu;
1915 }
1916
1917 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
1918 DMA_TO_DEVICE);
1919
1920 if (srp_post_send(target, iu, len)) {
1921 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1922 goto err_unmap;
1923 }
1924
1925 ret = 0;
1926
1927 unlock_rport:
1928 if (in_scsi_eh)
1929 mutex_unlock(&rport->mutex);
1930
1931 return ret;
1932
1933 err_unmap:
1934 srp_unmap_data(scmnd, target, req);
1935
1936 err_iu:
1937 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1938
1939 /*
1940 * Avoid that the loops that iterate over the request ring can
1941 * encounter a dangling SCSI command pointer.
1942 */
1943 req->scmnd = NULL;
1944
1945 spin_lock_irqsave(&target->lock, flags);
1946 list_add(&req->list, &target->free_reqs);
1947
1948 err_unlock:
1949 spin_unlock_irqrestore(&target->lock, flags);
1950
1951 err:
1952 if (scmnd->result) {
1953 scmnd->scsi_done(scmnd);
1954 ret = 0;
1955 } else {
1956 ret = SCSI_MLQUEUE_HOST_BUSY;
1957 }
1958
1959 goto unlock_rport;
1960 }
1961
1962 /*
1963 * Note: the resources allocated in this function are freed in
1964 * srp_free_target_ib().
1965 */
1966 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1967 {
1968 int i;
1969
1970 target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
1971 GFP_KERNEL);
1972 if (!target->rx_ring)
1973 goto err_no_ring;
1974 target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
1975 GFP_KERNEL);
1976 if (!target->tx_ring)
1977 goto err_no_ring;
1978
1979 for (i = 0; i < target->queue_size; ++i) {
1980 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1981 target->max_ti_iu_len,
1982 GFP_KERNEL, DMA_FROM_DEVICE);
1983 if (!target->rx_ring[i])
1984 goto err;
1985 }
1986
1987 for (i = 0; i < target->queue_size; ++i) {
1988 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1989 target->max_iu_len,
1990 GFP_KERNEL, DMA_TO_DEVICE);
1991 if (!target->tx_ring[i])
1992 goto err;
1993
1994 list_add(&target->tx_ring[i]->list, &target->free_tx);
1995 }
1996
1997 return 0;
1998
1999 err:
2000 for (i = 0; i < target->queue_size; ++i) {
2001 srp_free_iu(target->srp_host, target->rx_ring[i]);
2002 srp_free_iu(target->srp_host, target->tx_ring[i]);
2003 }
2004
2005
2006 err_no_ring:
2007 kfree(target->tx_ring);
2008 target->tx_ring = NULL;
2009 kfree(target->rx_ring);
2010 target->rx_ring = NULL;
2011
2012 return -ENOMEM;
2013 }
2014
2015 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
2016 {
2017 uint64_t T_tr_ns, max_compl_time_ms;
2018 uint32_t rq_tmo_jiffies;
2019
2020 /*
2021 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
2022 * table 91), both the QP timeout and the retry count have to be set
2023 * for RC QP's during the RTR to RTS transition.
2024 */
2025 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
2026 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
2027
2028 /*
2029 * Set target->rq_tmo_jiffies to one second more than the largest time
2030 * it can take before an error completion is generated. See also
2031 * C9-140..142 in the IBTA spec for more information about how to
2032 * convert the QP Local ACK Timeout value to nanoseconds.
2033 */
2034 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
2035 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
2036 do_div(max_compl_time_ms, NSEC_PER_MSEC);
2037 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
2038
2039 return rq_tmo_jiffies;
2040 }
2041
2042 static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
2043 struct srp_login_rsp *lrsp,
2044 struct srp_target_port *target)
2045 {
2046 struct ib_qp_attr *qp_attr = NULL;
2047 int attr_mask = 0;
2048 int ret;
2049 int i;
2050
2051 if (lrsp->opcode == SRP_LOGIN_RSP) {
2052 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
2053 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
2054
2055 /*
2056 * Reserve credits for task management so we don't
2057 * bounce requests back to the SCSI mid-layer.
2058 */
2059 target->scsi_host->can_queue
2060 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
2061 target->scsi_host->can_queue);
2062 target->scsi_host->cmd_per_lun
2063 = min_t(int, target->scsi_host->can_queue,
2064 target->scsi_host->cmd_per_lun);
2065 } else {
2066 shost_printk(KERN_WARNING, target->scsi_host,
2067 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
2068 ret = -ECONNRESET;
2069 goto error;
2070 }
2071
2072 if (!target->rx_ring) {
2073 ret = srp_alloc_iu_bufs(target);
2074 if (ret)
2075 goto error;
2076 }
2077
2078 ret = -ENOMEM;
2079 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
2080 if (!qp_attr)
2081 goto error;
2082
2083 qp_attr->qp_state = IB_QPS_RTR;
2084 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2085 if (ret)
2086 goto error_free;
2087
2088 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
2089 if (ret)
2090 goto error_free;
2091
2092 for (i = 0; i < target->queue_size; i++) {
2093 struct srp_iu *iu = target->rx_ring[i];
2094 ret = srp_post_recv(target, iu);
2095 if (ret)
2096 goto error_free;
2097 }
2098
2099 qp_attr->qp_state = IB_QPS_RTS;
2100 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2101 if (ret)
2102 goto error_free;
2103
2104 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
2105
2106 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
2107 if (ret)
2108 goto error_free;
2109
2110 ret = ib_send_cm_rtu(cm_id, NULL, 0);
2111
2112 error_free:
2113 kfree(qp_attr);
2114
2115 error:
2116 target->status = ret;
2117 }
2118
2119 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
2120 struct ib_cm_event *event,
2121 struct srp_target_port *target)
2122 {
2123 struct Scsi_Host *shost = target->scsi_host;
2124 struct ib_class_port_info *cpi;
2125 int opcode;
2126
2127 switch (event->param.rej_rcvd.reason) {
2128 case IB_CM_REJ_PORT_CM_REDIRECT:
2129 cpi = event->param.rej_rcvd.ari;
2130 target->path.dlid = cpi->redirect_lid;
2131 target->path.pkey = cpi->redirect_pkey;
2132 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
2133 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
2134
2135 target->status = target->path.dlid ?
2136 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
2137 break;
2138
2139 case IB_CM_REJ_PORT_REDIRECT:
2140 if (srp_target_is_topspin(target)) {
2141 /*
2142 * Topspin/Cisco SRP gateways incorrectly send
2143 * reject reason code 25 when they mean 24
2144 * (port redirect).
2145 */
2146 memcpy(target->path.dgid.raw,
2147 event->param.rej_rcvd.ari, 16);
2148
2149 shost_printk(KERN_DEBUG, shost,
2150 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
2151 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
2152 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
2153
2154 target->status = SRP_PORT_REDIRECT;
2155 } else {
2156 shost_printk(KERN_WARNING, shost,
2157 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
2158 target->status = -ECONNRESET;
2159 }
2160 break;
2161
2162 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
2163 shost_printk(KERN_WARNING, shost,
2164 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
2165 target->status = -ECONNRESET;
2166 break;
2167
2168 case IB_CM_REJ_CONSUMER_DEFINED:
2169 opcode = *(u8 *) event->private_data;
2170 if (opcode == SRP_LOGIN_REJ) {
2171 struct srp_login_rej *rej = event->private_data;
2172 u32 reason = be32_to_cpu(rej->reason);
2173
2174 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
2175 shost_printk(KERN_WARNING, shost,
2176 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
2177 else
2178 shost_printk(KERN_WARNING, shost, PFX
2179 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
2180 target->path.sgid.raw,
2181 target->orig_dgid, reason);
2182 } else
2183 shost_printk(KERN_WARNING, shost,
2184 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
2185 " opcode 0x%02x\n", opcode);
2186 target->status = -ECONNRESET;
2187 break;
2188
2189 case IB_CM_REJ_STALE_CONN:
2190 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
2191 target->status = SRP_STALE_CONN;
2192 break;
2193
2194 default:
2195 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
2196 event->param.rej_rcvd.reason);
2197 target->status = -ECONNRESET;
2198 }
2199 }
2200
2201 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2202 {
2203 struct srp_target_port *target = cm_id->context;
2204 int comp = 0;
2205
2206 switch (event->event) {
2207 case IB_CM_REQ_ERROR:
2208 shost_printk(KERN_DEBUG, target->scsi_host,
2209 PFX "Sending CM REQ failed\n");
2210 comp = 1;
2211 target->status = -ECONNRESET;
2212 break;
2213
2214 case IB_CM_REP_RECEIVED:
2215 comp = 1;
2216 srp_cm_rep_handler(cm_id, event->private_data, target);
2217 break;
2218
2219 case IB_CM_REJ_RECEIVED:
2220 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
2221 comp = 1;
2222
2223 srp_cm_rej_handler(cm_id, event, target);
2224 break;
2225
2226 case IB_CM_DREQ_RECEIVED:
2227 shost_printk(KERN_WARNING, target->scsi_host,
2228 PFX "DREQ received - connection closed\n");
2229 srp_change_conn_state(target, false);
2230 if (ib_send_cm_drep(cm_id, NULL, 0))
2231 shost_printk(KERN_ERR, target->scsi_host,
2232 PFX "Sending CM DREP failed\n");
2233 queue_work(system_long_wq, &target->tl_err_work);
2234 break;
2235
2236 case IB_CM_TIMEWAIT_EXIT:
2237 shost_printk(KERN_ERR, target->scsi_host,
2238 PFX "connection closed\n");
2239 comp = 1;
2240
2241 target->status = 0;
2242 break;
2243
2244 case IB_CM_MRA_RECEIVED:
2245 case IB_CM_DREQ_ERROR:
2246 case IB_CM_DREP_RECEIVED:
2247 break;
2248
2249 default:
2250 shost_printk(KERN_WARNING, target->scsi_host,
2251 PFX "Unhandled CM event %d\n", event->event);
2252 break;
2253 }
2254
2255 if (comp)
2256 complete(&target->done);
2257
2258 return 0;
2259 }
2260
2261 /**
2262 * srp_change_queue_type - changing device queue tag type
2263 * @sdev: scsi device struct
2264 * @tag_type: requested tag type
2265 *
2266 * Returns queue tag type.
2267 */
2268 static int
2269 srp_change_queue_type(struct scsi_device *sdev, int tag_type)
2270 {
2271 if (sdev->tagged_supported) {
2272 scsi_set_tag_type(sdev, tag_type);
2273 if (tag_type)
2274 scsi_activate_tcq(sdev, sdev->queue_depth);
2275 else
2276 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2277 } else
2278 tag_type = 0;
2279
2280 return tag_type;
2281 }
2282
2283 /**
2284 * srp_change_queue_depth - setting device queue depth
2285 * @sdev: scsi device struct
2286 * @qdepth: requested queue depth
2287 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
2288 * (see include/scsi/scsi_host.h for definition)
2289 *
2290 * Returns queue depth.
2291 */
2292 static int
2293 srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2294 {
2295 struct Scsi_Host *shost = sdev->host;
2296 int max_depth;
2297 if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
2298 max_depth = shost->can_queue;
2299 if (!sdev->tagged_supported)
2300 max_depth = 1;
2301 if (qdepth > max_depth)
2302 qdepth = max_depth;
2303 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2304 } else if (reason == SCSI_QDEPTH_QFULL)
2305 scsi_track_queue_full(sdev, qdepth);
2306 else
2307 return -EOPNOTSUPP;
2308
2309 return sdev->queue_depth;
2310 }
2311
2312 static int srp_send_tsk_mgmt(struct srp_target_port *target,
2313 u64 req_tag, unsigned int lun, u8 func)
2314 {
2315 struct srp_rport *rport = target->rport;
2316 struct ib_device *dev = target->srp_host->srp_dev->dev;
2317 struct srp_iu *iu;
2318 struct srp_tsk_mgmt *tsk_mgmt;
2319
2320 if (!target->connected || target->qp_in_error)
2321 return -1;
2322
2323 init_completion(&target->tsk_mgmt_done);
2324
2325 /*
2326 * Lock the rport mutex to avoid that srp_create_target_ib() is
2327 * invoked while a task management function is being sent.
2328 */
2329 mutex_lock(&rport->mutex);
2330 spin_lock_irq(&target->lock);
2331 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
2332 spin_unlock_irq(&target->lock);
2333
2334 if (!iu) {
2335 mutex_unlock(&rport->mutex);
2336
2337 return -1;
2338 }
2339
2340 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
2341 DMA_TO_DEVICE);
2342 tsk_mgmt = iu->buf;
2343 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2344
2345 tsk_mgmt->opcode = SRP_TSK_MGMT;
2346 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
2347 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
2348 tsk_mgmt->tsk_mgmt_func = func;
2349 tsk_mgmt->task_tag = req_tag;
2350
2351 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2352 DMA_TO_DEVICE);
2353 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
2354 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
2355 mutex_unlock(&rport->mutex);
2356
2357 return -1;
2358 }
2359 mutex_unlock(&rport->mutex);
2360
2361 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
2362 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
2363 return -1;
2364
2365 return 0;
2366 }
2367
2368 static int srp_abort(struct scsi_cmnd *scmnd)
2369 {
2370 struct srp_target_port *target = host_to_target(scmnd->device->host);
2371 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
2372 int ret;
2373
2374 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
2375
2376 if (!req || !srp_claim_req(target, req, NULL, scmnd))
2377 return SUCCESS;
2378 if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
2379 SRP_TSK_ABORT_TASK) == 0)
2380 ret = SUCCESS;
2381 else if (target->rport->state == SRP_RPORT_LOST)
2382 ret = FAST_IO_FAIL;
2383 else
2384 ret = FAILED;
2385 srp_free_req(target, req, scmnd, 0);
2386 scmnd->result = DID_ABORT << 16;
2387 scmnd->scsi_done(scmnd);
2388
2389 return ret;
2390 }
2391
2392 static int srp_reset_device(struct scsi_cmnd *scmnd)
2393 {
2394 struct srp_target_port *target = host_to_target(scmnd->device->host);
2395 int i;
2396
2397 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
2398
2399 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
2400 SRP_TSK_LUN_RESET))
2401 return FAILED;
2402 if (target->tsk_mgmt_status)
2403 return FAILED;
2404
2405 for (i = 0; i < target->req_ring_size; ++i) {
2406 struct srp_request *req = &target->req_ring[i];
2407 srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
2408 }
2409
2410 return SUCCESS;
2411 }
2412
2413 static int srp_reset_host(struct scsi_cmnd *scmnd)
2414 {
2415 struct srp_target_port *target = host_to_target(scmnd->device->host);
2416
2417 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
2418
2419 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
2420 }
2421
2422 static int srp_slave_configure(struct scsi_device *sdev)
2423 {
2424 struct Scsi_Host *shost = sdev->host;
2425 struct srp_target_port *target = host_to_target(shost);
2426 struct request_queue *q = sdev->request_queue;
2427 unsigned long timeout;
2428
2429 if (sdev->type == TYPE_DISK) {
2430 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2431 blk_queue_rq_timeout(q, timeout);
2432 }
2433
2434 return 0;
2435 }
2436
2437 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2438 char *buf)
2439 {
2440 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2441
2442 return sprintf(buf, "0x%016llx\n",
2443 (unsigned long long) be64_to_cpu(target->id_ext));
2444 }
2445
2446 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2447 char *buf)
2448 {
2449 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2450
2451 return sprintf(buf, "0x%016llx\n",
2452 (unsigned long long) be64_to_cpu(target->ioc_guid));
2453 }
2454
2455 static ssize_t show_service_id(struct device *dev,
2456 struct device_attribute *attr, char *buf)
2457 {
2458 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2459
2460 return sprintf(buf, "0x%016llx\n",
2461 (unsigned long long) be64_to_cpu(target->service_id));
2462 }
2463
2464 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2465 char *buf)
2466 {
2467 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2468
2469 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
2470 }
2471
2472 static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2473 char *buf)
2474 {
2475 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2476
2477 return sprintf(buf, "%pI6\n", target->path.sgid.raw);
2478 }
2479
2480 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2481 char *buf)
2482 {
2483 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2484
2485 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
2486 }
2487
2488 static ssize_t show_orig_dgid(struct device *dev,
2489 struct device_attribute *attr, char *buf)
2490 {
2491 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2492
2493 return sprintf(buf, "%pI6\n", target->orig_dgid);
2494 }
2495
2496 static ssize_t show_req_lim(struct device *dev,
2497 struct device_attribute *attr, char *buf)
2498 {
2499 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2500
2501 return sprintf(buf, "%d\n", target->req_lim);
2502 }
2503
2504 static ssize_t show_zero_req_lim(struct device *dev,
2505 struct device_attribute *attr, char *buf)
2506 {
2507 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2508
2509 return sprintf(buf, "%d\n", target->zero_req_lim);
2510 }
2511
2512 static ssize_t show_local_ib_port(struct device *dev,
2513 struct device_attribute *attr, char *buf)
2514 {
2515 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2516
2517 return sprintf(buf, "%d\n", target->srp_host->port);
2518 }
2519
2520 static ssize_t show_local_ib_device(struct device *dev,
2521 struct device_attribute *attr, char *buf)
2522 {
2523 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2524
2525 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
2526 }
2527
2528 static ssize_t show_comp_vector(struct device *dev,
2529 struct device_attribute *attr, char *buf)
2530 {
2531 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2532
2533 return sprintf(buf, "%d\n", target->comp_vector);
2534 }
2535
2536 static ssize_t show_tl_retry_count(struct device *dev,
2537 struct device_attribute *attr, char *buf)
2538 {
2539 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2540
2541 return sprintf(buf, "%d\n", target->tl_retry_count);
2542 }
2543
2544 static ssize_t show_cmd_sg_entries(struct device *dev,
2545 struct device_attribute *attr, char *buf)
2546 {
2547 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2548
2549 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2550 }
2551
2552 static ssize_t show_allow_ext_sg(struct device *dev,
2553 struct device_attribute *attr, char *buf)
2554 {
2555 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2556
2557 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2558 }
2559
2560 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2561 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2562 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2563 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2564 static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
2565 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2566 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
2567 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
2568 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2569 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2570 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
2571 static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
2572 static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
2573 static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
2574 static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
2575
2576 static struct device_attribute *srp_host_attrs[] = {
2577 &dev_attr_id_ext,
2578 &dev_attr_ioc_guid,
2579 &dev_attr_service_id,
2580 &dev_attr_pkey,
2581 &dev_attr_sgid,
2582 &dev_attr_dgid,
2583 &dev_attr_orig_dgid,
2584 &dev_attr_req_lim,
2585 &dev_attr_zero_req_lim,
2586 &dev_attr_local_ib_port,
2587 &dev_attr_local_ib_device,
2588 &dev_attr_comp_vector,
2589 &dev_attr_tl_retry_count,
2590 &dev_attr_cmd_sg_entries,
2591 &dev_attr_allow_ext_sg,
2592 NULL
2593 };
2594
2595 static struct scsi_host_template srp_template = {
2596 .module = THIS_MODULE,
2597 .name = "InfiniBand SRP initiator",
2598 .proc_name = DRV_NAME,
2599 .slave_configure = srp_slave_configure,
2600 .info = srp_target_info,
2601 .queuecommand = srp_queuecommand,
2602 .change_queue_depth = srp_change_queue_depth,
2603 .change_queue_type = srp_change_queue_type,
2604 .eh_abort_handler = srp_abort,
2605 .eh_device_reset_handler = srp_reset_device,
2606 .eh_host_reset_handler = srp_reset_host,
2607 .skip_settle_delay = true,
2608 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
2609 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
2610 .this_id = -1,
2611 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
2612 .use_clustering = ENABLE_CLUSTERING,
2613 .shost_attrs = srp_host_attrs
2614 };
2615
2616 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2617 {
2618 struct srp_rport_identifiers ids;
2619 struct srp_rport *rport;
2620
2621 sprintf(target->target_name, "SRP.T10:%016llX",
2622 (unsigned long long) be64_to_cpu(target->id_ext));
2623
2624 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
2625 return -ENODEV;
2626
2627 memcpy(ids.port_id, &target->id_ext, 8);
2628 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
2629 ids.roles = SRP_RPORT_ROLE_TARGET;
2630 rport = srp_rport_add(target->scsi_host, &ids);
2631 if (IS_ERR(rport)) {
2632 scsi_remove_host(target->scsi_host);
2633 return PTR_ERR(rport);
2634 }
2635
2636 rport->lld_data = target;
2637 target->rport = rport;
2638
2639 spin_lock(&host->target_lock);
2640 list_add_tail(&target->list, &host->target_list);
2641 spin_unlock(&host->target_lock);
2642
2643 target->state = SRP_TARGET_LIVE;
2644
2645 scsi_scan_target(&target->scsi_host->shost_gendev,
2646 0, target->scsi_id, SCAN_WILD_CARD, 0);
2647
2648 return 0;
2649 }
2650
2651 static void srp_release_dev(struct device *dev)
2652 {
2653 struct srp_host *host =
2654 container_of(dev, struct srp_host, dev);
2655
2656 complete(&host->released);
2657 }
2658
2659 static struct class srp_class = {
2660 .name = "infiniband_srp",
2661 .dev_release = srp_release_dev
2662 };
2663
2664 /**
2665 * srp_conn_unique() - check whether the connection to a target is unique
2666 * @host: SRP host.
2667 * @target: SRP target port.
2668 */
2669 static bool srp_conn_unique(struct srp_host *host,
2670 struct srp_target_port *target)
2671 {
2672 struct srp_target_port *t;
2673 bool ret = false;
2674
2675 if (target->state == SRP_TARGET_REMOVED)
2676 goto out;
2677
2678 ret = true;
2679
2680 spin_lock(&host->target_lock);
2681 list_for_each_entry(t, &host->target_list, list) {
2682 if (t != target &&
2683 target->id_ext == t->id_ext &&
2684 target->ioc_guid == t->ioc_guid &&
2685 target->initiator_ext == t->initiator_ext) {
2686 ret = false;
2687 break;
2688 }
2689 }
2690 spin_unlock(&host->target_lock);
2691
2692 out:
2693 return ret;
2694 }
2695
2696 /*
2697 * Target ports are added by writing
2698 *
2699 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2700 * pkey=<P_Key>,service_id=<service ID>
2701 *
2702 * to the add_target sysfs attribute.
2703 */
2704 enum {
2705 SRP_OPT_ERR = 0,
2706 SRP_OPT_ID_EXT = 1 << 0,
2707 SRP_OPT_IOC_GUID = 1 << 1,
2708 SRP_OPT_DGID = 1 << 2,
2709 SRP_OPT_PKEY = 1 << 3,
2710 SRP_OPT_SERVICE_ID = 1 << 4,
2711 SRP_OPT_MAX_SECT = 1 << 5,
2712 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
2713 SRP_OPT_IO_CLASS = 1 << 7,
2714 SRP_OPT_INITIATOR_EXT = 1 << 8,
2715 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
2716 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2717 SRP_OPT_SG_TABLESIZE = 1 << 11,
2718 SRP_OPT_COMP_VECTOR = 1 << 12,
2719 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
2720 SRP_OPT_QUEUE_SIZE = 1 << 14,
2721 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2722 SRP_OPT_IOC_GUID |
2723 SRP_OPT_DGID |
2724 SRP_OPT_PKEY |
2725 SRP_OPT_SERVICE_ID),
2726 };
2727
2728 static const match_table_t srp_opt_tokens = {
2729 { SRP_OPT_ID_EXT, "id_ext=%s" },
2730 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2731 { SRP_OPT_DGID, "dgid=%s" },
2732 { SRP_OPT_PKEY, "pkey=%x" },
2733 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2734 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2735 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
2736 { SRP_OPT_IO_CLASS, "io_class=%x" },
2737 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
2738 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
2739 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2740 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
2741 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
2742 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
2743 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
2744 { SRP_OPT_ERR, NULL }
2745 };
2746
2747 static int srp_parse_options(const char *buf, struct srp_target_port *target)
2748 {
2749 char *options, *sep_opt;
2750 char *p;
2751 char dgid[3];
2752 substring_t args[MAX_OPT_ARGS];
2753 int opt_mask = 0;
2754 int token;
2755 int ret = -EINVAL;
2756 int i;
2757
2758 options = kstrdup(buf, GFP_KERNEL);
2759 if (!options)
2760 return -ENOMEM;
2761
2762 sep_opt = options;
2763 while ((p = strsep(&sep_opt, ",")) != NULL) {
2764 if (!*p)
2765 continue;
2766
2767 token = match_token(p, srp_opt_tokens, args);
2768 opt_mask |= token;
2769
2770 switch (token) {
2771 case SRP_OPT_ID_EXT:
2772 p = match_strdup(args);
2773 if (!p) {
2774 ret = -ENOMEM;
2775 goto out;
2776 }
2777 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2778 kfree(p);
2779 break;
2780
2781 case SRP_OPT_IOC_GUID:
2782 p = match_strdup(args);
2783 if (!p) {
2784 ret = -ENOMEM;
2785 goto out;
2786 }
2787 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2788 kfree(p);
2789 break;
2790
2791 case SRP_OPT_DGID:
2792 p = match_strdup(args);
2793 if (!p) {
2794 ret = -ENOMEM;
2795 goto out;
2796 }
2797 if (strlen(p) != 32) {
2798 pr_warn("bad dest GID parameter '%s'\n", p);
2799 kfree(p);
2800 goto out;
2801 }
2802
2803 for (i = 0; i < 16; ++i) {
2804 strlcpy(dgid, p + i * 2, 3);
2805 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2806 }
2807 kfree(p);
2808 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
2809 break;
2810
2811 case SRP_OPT_PKEY:
2812 if (match_hex(args, &token)) {
2813 pr_warn("bad P_Key parameter '%s'\n", p);
2814 goto out;
2815 }
2816 target->path.pkey = cpu_to_be16(token);
2817 break;
2818
2819 case SRP_OPT_SERVICE_ID:
2820 p = match_strdup(args);
2821 if (!p) {
2822 ret = -ENOMEM;
2823 goto out;
2824 }
2825 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2826 target->path.service_id = target->service_id;
2827 kfree(p);
2828 break;
2829
2830 case SRP_OPT_MAX_SECT:
2831 if (match_int(args, &token)) {
2832 pr_warn("bad max sect parameter '%s'\n", p);
2833 goto out;
2834 }
2835 target->scsi_host->max_sectors = token;
2836 break;
2837
2838 case SRP_OPT_QUEUE_SIZE:
2839 if (match_int(args, &token) || token < 1) {
2840 pr_warn("bad queue_size parameter '%s'\n", p);
2841 goto out;
2842 }
2843 target->scsi_host->can_queue = token;
2844 target->queue_size = token + SRP_RSP_SQ_SIZE +
2845 SRP_TSK_MGMT_SQ_SIZE;
2846 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2847 target->scsi_host->cmd_per_lun = token;
2848 break;
2849
2850 case SRP_OPT_MAX_CMD_PER_LUN:
2851 if (match_int(args, &token) || token < 1) {
2852 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2853 p);
2854 goto out;
2855 }
2856 target->scsi_host->cmd_per_lun = token;
2857 break;
2858
2859 case SRP_OPT_IO_CLASS:
2860 if (match_hex(args, &token)) {
2861 pr_warn("bad IO class parameter '%s'\n", p);
2862 goto out;
2863 }
2864 if (token != SRP_REV10_IB_IO_CLASS &&
2865 token != SRP_REV16A_IB_IO_CLASS) {
2866 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2867 token, SRP_REV10_IB_IO_CLASS,
2868 SRP_REV16A_IB_IO_CLASS);
2869 goto out;
2870 }
2871 target->io_class = token;
2872 break;
2873
2874 case SRP_OPT_INITIATOR_EXT:
2875 p = match_strdup(args);
2876 if (!p) {
2877 ret = -ENOMEM;
2878 goto out;
2879 }
2880 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2881 kfree(p);
2882 break;
2883
2884 case SRP_OPT_CMD_SG_ENTRIES:
2885 if (match_int(args, &token) || token < 1 || token > 255) {
2886 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2887 p);
2888 goto out;
2889 }
2890 target->cmd_sg_cnt = token;
2891 break;
2892
2893 case SRP_OPT_ALLOW_EXT_SG:
2894 if (match_int(args, &token)) {
2895 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
2896 goto out;
2897 }
2898 target->allow_ext_sg = !!token;
2899 break;
2900
2901 case SRP_OPT_SG_TABLESIZE:
2902 if (match_int(args, &token) || token < 1 ||
2903 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
2904 pr_warn("bad max sg_tablesize parameter '%s'\n",
2905 p);
2906 goto out;
2907 }
2908 target->sg_tablesize = token;
2909 break;
2910
2911 case SRP_OPT_COMP_VECTOR:
2912 if (match_int(args, &token) || token < 0) {
2913 pr_warn("bad comp_vector parameter '%s'\n", p);
2914 goto out;
2915 }
2916 target->comp_vector = token;
2917 break;
2918
2919 case SRP_OPT_TL_RETRY_COUNT:
2920 if (match_int(args, &token) || token < 2 || token > 7) {
2921 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2922 p);
2923 goto out;
2924 }
2925 target->tl_retry_count = token;
2926 break;
2927
2928 default:
2929 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2930 p);
2931 goto out;
2932 }
2933 }
2934
2935 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2936 ret = 0;
2937 else
2938 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2939 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2940 !(srp_opt_tokens[i].token & opt_mask))
2941 pr_warn("target creation request is missing parameter '%s'\n",
2942 srp_opt_tokens[i].pattern);
2943
2944 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
2945 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
2946 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2947 target->scsi_host->cmd_per_lun,
2948 target->scsi_host->can_queue);
2949
2950 out:
2951 kfree(options);
2952 return ret;
2953 }
2954
2955 static ssize_t srp_create_target(struct device *dev,
2956 struct device_attribute *attr,
2957 const char *buf, size_t count)
2958 {
2959 struct srp_host *host =
2960 container_of(dev, struct srp_host, dev);
2961 struct Scsi_Host *target_host;
2962 struct srp_target_port *target;
2963 struct srp_device *srp_dev = host->srp_dev;
2964 struct ib_device *ibdev = srp_dev->dev;
2965 int ret;
2966
2967 target_host = scsi_host_alloc(&srp_template,
2968 sizeof (struct srp_target_port));
2969 if (!target_host)
2970 return -ENOMEM;
2971
2972 target_host->transportt = ib_srp_transport_template;
2973 target_host->max_channel = 0;
2974 target_host->max_id = 1;
2975 target_host->max_lun = SRP_MAX_LUN;
2976 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
2977
2978 target = host_to_target(target_host);
2979
2980 target->io_class = SRP_REV16A_IB_IO_CLASS;
2981 target->scsi_host = target_host;
2982 target->srp_host = host;
2983 target->lkey = host->srp_dev->mr->lkey;
2984 target->rkey = host->srp_dev->mr->rkey;
2985 target->cmd_sg_cnt = cmd_sg_entries;
2986 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2987 target->allow_ext_sg = allow_ext_sg;
2988 target->tl_retry_count = 7;
2989 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
2990
2991 mutex_lock(&host->add_target_mutex);
2992
2993 ret = srp_parse_options(buf, target);
2994 if (ret)
2995 goto err;
2996
2997 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
2998
2999 if (!srp_conn_unique(target->srp_host, target)) {
3000 shost_printk(KERN_INFO, target->scsi_host,
3001 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
3002 be64_to_cpu(target->id_ext),
3003 be64_to_cpu(target->ioc_guid),
3004 be64_to_cpu(target->initiator_ext));
3005 ret = -EEXIST;
3006 goto err;
3007 }
3008
3009 if (!srp_dev->has_fmr && !srp_dev->has_fr && !target->allow_ext_sg &&
3010 target->cmd_sg_cnt < target->sg_tablesize) {
3011 pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
3012 target->sg_tablesize = target->cmd_sg_cnt;
3013 }
3014
3015 target_host->sg_tablesize = target->sg_tablesize;
3016 target->indirect_size = target->sg_tablesize *
3017 sizeof (struct srp_direct_buf);
3018 target->max_iu_len = sizeof (struct srp_cmd) +
3019 sizeof (struct srp_indirect_buf) +
3020 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
3021
3022 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
3023 INIT_WORK(&target->remove_work, srp_remove_work);
3024 spin_lock_init(&target->lock);
3025 INIT_LIST_HEAD(&target->free_tx);
3026 ret = srp_alloc_req_data(target);
3027 if (ret)
3028 goto err_free_mem;
3029
3030 ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
3031 if (ret)
3032 goto err_free_mem;
3033
3034 ret = srp_create_target_ib(target);
3035 if (ret)
3036 goto err_free_mem;
3037
3038 ret = srp_new_cm_id(target);
3039 if (ret)
3040 goto err_free_ib;
3041
3042 ret = srp_connect_target(target);
3043 if (ret) {
3044 shost_printk(KERN_ERR, target->scsi_host,
3045 PFX "Connection failed\n");
3046 goto err_cm_id;
3047 }
3048
3049 ret = srp_add_target(host, target);
3050 if (ret)
3051 goto err_disconnect;
3052
3053 shost_printk(KERN_DEBUG, target->scsi_host, PFX
3054 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
3055 be64_to_cpu(target->id_ext),
3056 be64_to_cpu(target->ioc_guid),
3057 be16_to_cpu(target->path.pkey),
3058 be64_to_cpu(target->service_id),
3059 target->path.sgid.raw, target->path.dgid.raw);
3060
3061 ret = count;
3062
3063 out:
3064 mutex_unlock(&host->add_target_mutex);
3065 return ret;
3066
3067 err_disconnect:
3068 srp_disconnect_target(target);
3069
3070 err_cm_id:
3071 ib_destroy_cm_id(target->cm_id);
3072
3073 err_free_ib:
3074 srp_free_target_ib(target);
3075
3076 err_free_mem:
3077 srp_free_req_data(target);
3078
3079 err:
3080 scsi_host_put(target_host);
3081 goto out;
3082 }
3083
3084 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
3085
3086 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
3087 char *buf)
3088 {
3089 struct srp_host *host = container_of(dev, struct srp_host, dev);
3090
3091 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
3092 }
3093
3094 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
3095
3096 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
3097 char *buf)
3098 {
3099 struct srp_host *host = container_of(dev, struct srp_host, dev);
3100
3101 return sprintf(buf, "%d\n", host->port);
3102 }
3103
3104 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
3105
3106 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
3107 {
3108 struct srp_host *host;
3109
3110 host = kzalloc(sizeof *host, GFP_KERNEL);
3111 if (!host)
3112 return NULL;
3113
3114 INIT_LIST_HEAD(&host->target_list);
3115 spin_lock_init(&host->target_lock);
3116 init_completion(&host->released);
3117 mutex_init(&host->add_target_mutex);
3118 host->srp_dev = device;
3119 host->port = port;
3120
3121 host->dev.class = &srp_class;
3122 host->dev.parent = device->dev->dma_device;
3123 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
3124
3125 if (device_register(&host->dev))
3126 goto free_host;
3127 if (device_create_file(&host->dev, &dev_attr_add_target))
3128 goto err_class;
3129 if (device_create_file(&host->dev, &dev_attr_ibdev))
3130 goto err_class;
3131 if (device_create_file(&host->dev, &dev_attr_port))
3132 goto err_class;
3133
3134 return host;
3135
3136 err_class:
3137 device_unregister(&host->dev);
3138
3139 free_host:
3140 kfree(host);
3141
3142 return NULL;
3143 }
3144
3145 static void srp_add_one(struct ib_device *device)
3146 {
3147 struct srp_device *srp_dev;
3148 struct ib_device_attr *dev_attr;
3149 struct srp_host *host;
3150 int mr_page_shift, s, e, p;
3151 u64 max_pages_per_mr;
3152
3153 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
3154 if (!dev_attr)
3155 return;
3156
3157 if (ib_query_device(device, dev_attr)) {
3158 pr_warn("Query device failed for %s\n", device->name);
3159 goto free_attr;
3160 }
3161
3162 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
3163 if (!srp_dev)
3164 goto free_attr;
3165
3166 srp_dev->has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
3167 device->map_phys_fmr && device->unmap_fmr);
3168 srp_dev->has_fr = (dev_attr->device_cap_flags &
3169 IB_DEVICE_MEM_MGT_EXTENSIONS);
3170 if (!srp_dev->has_fmr && !srp_dev->has_fr)
3171 dev_warn(&device->dev, "neither FMR nor FR is supported\n");
3172
3173 srp_dev->use_fast_reg = (srp_dev->has_fr &&
3174 (!srp_dev->has_fmr || prefer_fr));
3175
3176 /*
3177 * Use the smallest page size supported by the HCA, down to a
3178 * minimum of 4096 bytes. We're unlikely to build large sglists
3179 * out of smaller entries.
3180 */
3181 mr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
3182 srp_dev->mr_page_size = 1 << mr_page_shift;
3183 srp_dev->mr_page_mask = ~((u64) srp_dev->mr_page_size - 1);
3184 max_pages_per_mr = dev_attr->max_mr_size;
3185 do_div(max_pages_per_mr, srp_dev->mr_page_size);
3186 srp_dev->max_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR,
3187 max_pages_per_mr);
3188 if (srp_dev->use_fast_reg) {
3189 srp_dev->max_pages_per_mr =
3190 min_t(u32, srp_dev->max_pages_per_mr,
3191 dev_attr->max_fast_reg_page_list_len);
3192 }
3193 srp_dev->mr_max_size = srp_dev->mr_page_size *
3194 srp_dev->max_pages_per_mr;
3195 pr_debug("%s: mr_page_shift = %d, dev_attr->max_mr_size = %#llx, dev_attr->max_fast_reg_page_list_len = %u, max_pages_per_mr = %d, mr_max_size = %#x\n",
3196 device->name, mr_page_shift, dev_attr->max_mr_size,
3197 dev_attr->max_fast_reg_page_list_len,
3198 srp_dev->max_pages_per_mr, srp_dev->mr_max_size);
3199
3200 INIT_LIST_HEAD(&srp_dev->dev_list);
3201
3202 srp_dev->dev = device;
3203 srp_dev->pd = ib_alloc_pd(device);
3204 if (IS_ERR(srp_dev->pd))
3205 goto free_dev;
3206
3207 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
3208 IB_ACCESS_LOCAL_WRITE |
3209 IB_ACCESS_REMOTE_READ |
3210 IB_ACCESS_REMOTE_WRITE);
3211 if (IS_ERR(srp_dev->mr))
3212 goto err_pd;
3213
3214 if (device->node_type == RDMA_NODE_IB_SWITCH) {
3215 s = 0;
3216 e = 0;
3217 } else {
3218 s = 1;
3219 e = device->phys_port_cnt;
3220 }
3221
3222 for (p = s; p <= e; ++p) {
3223 host = srp_add_port(srp_dev, p);
3224 if (host)
3225 list_add_tail(&host->list, &srp_dev->dev_list);
3226 }
3227
3228 ib_set_client_data(device, &srp_client, srp_dev);
3229
3230 goto free_attr;
3231
3232 err_pd:
3233 ib_dealloc_pd(srp_dev->pd);
3234
3235 free_dev:
3236 kfree(srp_dev);
3237
3238 free_attr:
3239 kfree(dev_attr);
3240 }
3241
3242 static void srp_remove_one(struct ib_device *device)
3243 {
3244 struct srp_device *srp_dev;
3245 struct srp_host *host, *tmp_host;
3246 struct srp_target_port *target;
3247
3248 srp_dev = ib_get_client_data(device, &srp_client);
3249 if (!srp_dev)
3250 return;
3251
3252 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
3253 device_unregister(&host->dev);
3254 /*
3255 * Wait for the sysfs entry to go away, so that no new
3256 * target ports can be created.
3257 */
3258 wait_for_completion(&host->released);
3259
3260 /*
3261 * Remove all target ports.
3262 */
3263 spin_lock(&host->target_lock);
3264 list_for_each_entry(target, &host->target_list, list)
3265 srp_queue_remove_work(target);
3266 spin_unlock(&host->target_lock);
3267
3268 /*
3269 * Wait for tl_err and target port removal tasks.
3270 */
3271 flush_workqueue(system_long_wq);
3272 flush_workqueue(srp_remove_wq);
3273
3274 kfree(host);
3275 }
3276
3277 ib_dereg_mr(srp_dev->mr);
3278 ib_dealloc_pd(srp_dev->pd);
3279
3280 kfree(srp_dev);
3281 }
3282
3283 static struct srp_function_template ib_srp_transport_functions = {
3284 .has_rport_state = true,
3285 .reset_timer_if_blocked = true,
3286 .reconnect_delay = &srp_reconnect_delay,
3287 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
3288 .dev_loss_tmo = &srp_dev_loss_tmo,
3289 .reconnect = srp_rport_reconnect,
3290 .rport_delete = srp_rport_delete,
3291 .terminate_rport_io = srp_terminate_io,
3292 };
3293
3294 static int __init srp_init_module(void)
3295 {
3296 int ret;
3297
3298 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
3299
3300 if (srp_sg_tablesize) {
3301 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
3302 if (!cmd_sg_entries)
3303 cmd_sg_entries = srp_sg_tablesize;
3304 }
3305
3306 if (!cmd_sg_entries)
3307 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
3308
3309 if (cmd_sg_entries > 255) {
3310 pr_warn("Clamping cmd_sg_entries to 255\n");
3311 cmd_sg_entries = 255;
3312 }
3313
3314 if (!indirect_sg_entries)
3315 indirect_sg_entries = cmd_sg_entries;
3316 else if (indirect_sg_entries < cmd_sg_entries) {
3317 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
3318 cmd_sg_entries);
3319 indirect_sg_entries = cmd_sg_entries;
3320 }
3321
3322 srp_remove_wq = create_workqueue("srp_remove");
3323 if (IS_ERR(srp_remove_wq)) {
3324 ret = PTR_ERR(srp_remove_wq);
3325 goto out;
3326 }
3327
3328 ret = -ENOMEM;
3329 ib_srp_transport_template =
3330 srp_attach_transport(&ib_srp_transport_functions);
3331 if (!ib_srp_transport_template)
3332 goto destroy_wq;
3333
3334 ret = class_register(&srp_class);
3335 if (ret) {
3336 pr_err("couldn't register class infiniband_srp\n");
3337 goto release_tr;
3338 }
3339
3340 ib_sa_register_client(&srp_sa_client);
3341
3342 ret = ib_register_client(&srp_client);
3343 if (ret) {
3344 pr_err("couldn't register IB client\n");
3345 goto unreg_sa;
3346 }
3347
3348 out:
3349 return ret;
3350
3351 unreg_sa:
3352 ib_sa_unregister_client(&srp_sa_client);
3353 class_unregister(&srp_class);
3354
3355 release_tr:
3356 srp_release_transport(ib_srp_transport_template);
3357
3358 destroy_wq:
3359 destroy_workqueue(srp_remove_wq);
3360 goto out;
3361 }
3362
3363 static void __exit srp_cleanup_module(void)
3364 {
3365 ib_unregister_client(&srp_client);
3366 ib_sa_unregister_client(&srp_sa_client);
3367 class_unregister(&srp_class);
3368 srp_release_transport(ib_srp_transport_template);
3369 destroy_workqueue(srp_remove_wq);
3370 }
3371
3372 module_init(srp_init_module);
3373 module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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