Commit | Line | Data |
---|---|---|
aef9ec39 RD |
1 | /* |
2 | * Copyright (c) 2005 Cisco Systems. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
aef9ec39 RD |
31 | */ |
32 | ||
d236cd0e | 33 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
e0bda7d8 | 34 | |
aef9ec39 RD |
35 | #include <linux/module.h> |
36 | #include <linux/init.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/err.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/parser.h> | |
41 | #include <linux/random.h> | |
de25968c | 42 | #include <linux/jiffies.h> |
aef9ec39 | 43 | |
60063497 | 44 | #include <linux/atomic.h> |
aef9ec39 RD |
45 | |
46 | #include <scsi/scsi.h> | |
47 | #include <scsi/scsi_device.h> | |
48 | #include <scsi/scsi_dbg.h> | |
71444b97 | 49 | #include <scsi/scsi_tcq.h> |
aef9ec39 | 50 | #include <scsi/srp.h> |
3236822b | 51 | #include <scsi/scsi_transport_srp.h> |
aef9ec39 | 52 | |
aef9ec39 RD |
53 | #include "ib_srp.h" |
54 | ||
55 | #define DRV_NAME "ib_srp" | |
56 | #define PFX DRV_NAME ": " | |
e8ca4135 VP |
57 | #define DRV_VERSION "1.0" |
58 | #define DRV_RELDATE "July 1, 2013" | |
aef9ec39 RD |
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 | ||
49248644 DD |
65 | static unsigned int srp_sg_tablesize; |
66 | static unsigned int cmd_sg_entries; | |
c07d424d DD |
67 | static unsigned int indirect_sg_entries; |
68 | static bool allow_ext_sg; | |
5cfb1782 | 69 | static bool prefer_fr; |
b1b8854d | 70 | static bool register_always; |
49248644 | 71 | static int topspin_workarounds = 1; |
74b0a15b | 72 | |
49248644 DD |
73 | module_param(srp_sg_tablesize, uint, 0444); |
74 | MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries"); | |
74b0a15b | 75 | |
49248644 DD |
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)"); | |
aef9ec39 | 79 | |
c07d424d DD |
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 | ||
aef9ec39 RD |
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 | ||
5cfb1782 BVA |
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 | ||
b1b8854d BVA |
96 | module_param(register_always, bool, 0444); |
97 | MODULE_PARM_DESC(register_always, | |
98 | "Use memory registration even for contiguous memory regions"); | |
99 | ||
ed9b2264 BVA |
100 | static struct kernel_param_ops srp_tmo_ops; |
101 | ||
a95cadb9 BVA |
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 | ||
ed9b2264 BVA |
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 | ||
a95cadb9 | 115 | static int srp_dev_loss_tmo = 600; |
ed9b2264 BVA |
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 | ||
aef9ec39 RD |
126 | static void srp_add_one(struct ib_device *device); |
127 | static void srp_remove_one(struct ib_device *device); | |
9c03dc9f BVA |
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); | |
aef9ec39 RD |
130 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); |
131 | ||
3236822b FT |
132 | static struct scsi_transport_template *ib_srp_transport_template; |
133 | ||
aef9ec39 RD |
134 | static struct ib_client srp_client = { |
135 | .name = "srp", | |
136 | .add = srp_add_one, | |
137 | .remove = srp_remove_one | |
138 | }; | |
139 | ||
c1a0b23b MT |
140 | static struct ib_sa_client srp_sa_client; |
141 | ||
ed9b2264 BVA |
142 | static int srp_tmo_get(char *buffer, const struct kernel_param *kp) |
143 | { | |
144 | int tmo = *(int *)kp->arg; | |
145 | ||
146 | if (tmo >= 0) | |
147 | return sprintf(buffer, "%d", tmo); | |
148 | else | |
149 | return sprintf(buffer, "off"); | |
150 | } | |
151 | ||
152 | static int srp_tmo_set(const char *val, const struct kernel_param *kp) | |
153 | { | |
154 | int tmo, res; | |
155 | ||
156 | if (strncmp(val, "off", 3) != 0) { | |
157 | res = kstrtoint(val, 0, &tmo); | |
158 | if (res) | |
159 | goto out; | |
160 | } else { | |
161 | tmo = -1; | |
162 | } | |
a95cadb9 BVA |
163 | if (kp->arg == &srp_reconnect_delay) |
164 | res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo, | |
165 | srp_dev_loss_tmo); | |
166 | else if (kp->arg == &srp_fast_io_fail_tmo) | |
167 | res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo); | |
ed9b2264 | 168 | else |
a95cadb9 BVA |
169 | res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo, |
170 | tmo); | |
ed9b2264 BVA |
171 | if (res) |
172 | goto out; | |
173 | *(int *)kp->arg = tmo; | |
174 | ||
175 | out: | |
176 | return res; | |
177 | } | |
178 | ||
179 | static struct kernel_param_ops srp_tmo_ops = { | |
180 | .get = srp_tmo_get, | |
181 | .set = srp_tmo_set, | |
182 | }; | |
183 | ||
aef9ec39 RD |
184 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) |
185 | { | |
186 | return (struct srp_target_port *) host->hostdata; | |
187 | } | |
188 | ||
189 | static const char *srp_target_info(struct Scsi_Host *host) | |
190 | { | |
191 | return host_to_target(host)->target_name; | |
192 | } | |
193 | ||
5d7cbfd6 RD |
194 | static int srp_target_is_topspin(struct srp_target_port *target) |
195 | { | |
196 | static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; | |
3d1ff48d | 197 | static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d }; |
5d7cbfd6 RD |
198 | |
199 | return topspin_workarounds && | |
3d1ff48d RK |
200 | (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) || |
201 | !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui)); | |
5d7cbfd6 RD |
202 | } |
203 | ||
aef9ec39 RD |
204 | static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, |
205 | gfp_t gfp_mask, | |
206 | enum dma_data_direction direction) | |
207 | { | |
208 | struct srp_iu *iu; | |
209 | ||
210 | iu = kmalloc(sizeof *iu, gfp_mask); | |
211 | if (!iu) | |
212 | goto out; | |
213 | ||
214 | iu->buf = kzalloc(size, gfp_mask); | |
215 | if (!iu->buf) | |
216 | goto out_free_iu; | |
217 | ||
05321937 GKH |
218 | iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size, |
219 | direction); | |
220 | if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma)) | |
aef9ec39 RD |
221 | goto out_free_buf; |
222 | ||
223 | iu->size = size; | |
224 | iu->direction = direction; | |
225 | ||
226 | return iu; | |
227 | ||
228 | out_free_buf: | |
229 | kfree(iu->buf); | |
230 | out_free_iu: | |
231 | kfree(iu); | |
232 | out: | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) | |
237 | { | |
238 | if (!iu) | |
239 | return; | |
240 | ||
05321937 GKH |
241 | ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size, |
242 | iu->direction); | |
aef9ec39 RD |
243 | kfree(iu->buf); |
244 | kfree(iu); | |
245 | } | |
246 | ||
247 | static void srp_qp_event(struct ib_event *event, void *context) | |
248 | { | |
e0bda7d8 | 249 | pr_debug("QP event %d\n", event->event); |
aef9ec39 RD |
250 | } |
251 | ||
252 | static int srp_init_qp(struct srp_target_port *target, | |
253 | struct ib_qp *qp) | |
254 | { | |
255 | struct ib_qp_attr *attr; | |
256 | int ret; | |
257 | ||
258 | attr = kmalloc(sizeof *attr, GFP_KERNEL); | |
259 | if (!attr) | |
260 | return -ENOMEM; | |
261 | ||
969a60f9 RD |
262 | ret = ib_find_pkey(target->srp_host->srp_dev->dev, |
263 | target->srp_host->port, | |
264 | be16_to_cpu(target->path.pkey), | |
265 | &attr->pkey_index); | |
aef9ec39 RD |
266 | if (ret) |
267 | goto out; | |
268 | ||
269 | attr->qp_state = IB_QPS_INIT; | |
270 | attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | | |
271 | IB_ACCESS_REMOTE_WRITE); | |
272 | attr->port_num = target->srp_host->port; | |
273 | ||
274 | ret = ib_modify_qp(qp, attr, | |
275 | IB_QP_STATE | | |
276 | IB_QP_PKEY_INDEX | | |
277 | IB_QP_ACCESS_FLAGS | | |
278 | IB_QP_PORT); | |
279 | ||
280 | out: | |
281 | kfree(attr); | |
282 | return ret; | |
283 | } | |
284 | ||
9fe4bcf4 DD |
285 | static int srp_new_cm_id(struct srp_target_port *target) |
286 | { | |
287 | struct ib_cm_id *new_cm_id; | |
288 | ||
05321937 | 289 | new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev, |
9fe4bcf4 DD |
290 | srp_cm_handler, target); |
291 | if (IS_ERR(new_cm_id)) | |
292 | return PTR_ERR(new_cm_id); | |
293 | ||
294 | if (target->cm_id) | |
295 | ib_destroy_cm_id(target->cm_id); | |
296 | target->cm_id = new_cm_id; | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
d1b4289e BVA |
301 | static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target) |
302 | { | |
303 | struct srp_device *dev = target->srp_host->srp_dev; | |
304 | struct ib_fmr_pool_param fmr_param; | |
305 | ||
306 | memset(&fmr_param, 0, sizeof(fmr_param)); | |
307 | fmr_param.pool_size = target->scsi_host->can_queue; | |
308 | fmr_param.dirty_watermark = fmr_param.pool_size / 4; | |
309 | fmr_param.cache = 1; | |
52ede08f BVA |
310 | fmr_param.max_pages_per_fmr = dev->max_pages_per_mr; |
311 | fmr_param.page_shift = ilog2(dev->mr_page_size); | |
d1b4289e BVA |
312 | fmr_param.access = (IB_ACCESS_LOCAL_WRITE | |
313 | IB_ACCESS_REMOTE_WRITE | | |
314 | IB_ACCESS_REMOTE_READ); | |
315 | ||
316 | return ib_create_fmr_pool(dev->pd, &fmr_param); | |
317 | } | |
318 | ||
5cfb1782 BVA |
319 | /** |
320 | * srp_destroy_fr_pool() - free the resources owned by a pool | |
321 | * @pool: Fast registration pool to be destroyed. | |
322 | */ | |
323 | static void srp_destroy_fr_pool(struct srp_fr_pool *pool) | |
324 | { | |
325 | int i; | |
326 | struct srp_fr_desc *d; | |
327 | ||
328 | if (!pool) | |
329 | return; | |
330 | ||
331 | for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) { | |
332 | if (d->frpl) | |
333 | ib_free_fast_reg_page_list(d->frpl); | |
334 | if (d->mr) | |
335 | ib_dereg_mr(d->mr); | |
336 | } | |
337 | kfree(pool); | |
338 | } | |
339 | ||
340 | /** | |
341 | * srp_create_fr_pool() - allocate and initialize a pool for fast registration | |
342 | * @device: IB device to allocate fast registration descriptors for. | |
343 | * @pd: Protection domain associated with the FR descriptors. | |
344 | * @pool_size: Number of descriptors to allocate. | |
345 | * @max_page_list_len: Maximum fast registration work request page list length. | |
346 | */ | |
347 | static struct srp_fr_pool *srp_create_fr_pool(struct ib_device *device, | |
348 | struct ib_pd *pd, int pool_size, | |
349 | int max_page_list_len) | |
350 | { | |
351 | struct srp_fr_pool *pool; | |
352 | struct srp_fr_desc *d; | |
353 | struct ib_mr *mr; | |
354 | struct ib_fast_reg_page_list *frpl; | |
355 | int i, ret = -EINVAL; | |
356 | ||
357 | if (pool_size <= 0) | |
358 | goto err; | |
359 | ret = -ENOMEM; | |
360 | pool = kzalloc(sizeof(struct srp_fr_pool) + | |
361 | pool_size * sizeof(struct srp_fr_desc), GFP_KERNEL); | |
362 | if (!pool) | |
363 | goto err; | |
364 | pool->size = pool_size; | |
365 | pool->max_page_list_len = max_page_list_len; | |
366 | spin_lock_init(&pool->lock); | |
367 | INIT_LIST_HEAD(&pool->free_list); | |
368 | ||
369 | for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) { | |
370 | mr = ib_alloc_fast_reg_mr(pd, max_page_list_len); | |
371 | if (IS_ERR(mr)) { | |
372 | ret = PTR_ERR(mr); | |
373 | goto destroy_pool; | |
374 | } | |
375 | d->mr = mr; | |
376 | frpl = ib_alloc_fast_reg_page_list(device, max_page_list_len); | |
377 | if (IS_ERR(frpl)) { | |
378 | ret = PTR_ERR(frpl); | |
379 | goto destroy_pool; | |
380 | } | |
381 | d->frpl = frpl; | |
382 | list_add_tail(&d->entry, &pool->free_list); | |
383 | } | |
384 | ||
385 | out: | |
386 | return pool; | |
387 | ||
388 | destroy_pool: | |
389 | srp_destroy_fr_pool(pool); | |
390 | ||
391 | err: | |
392 | pool = ERR_PTR(ret); | |
393 | goto out; | |
394 | } | |
395 | ||
396 | /** | |
397 | * srp_fr_pool_get() - obtain a descriptor suitable for fast registration | |
398 | * @pool: Pool to obtain descriptor from. | |
399 | */ | |
400 | static struct srp_fr_desc *srp_fr_pool_get(struct srp_fr_pool *pool) | |
401 | { | |
402 | struct srp_fr_desc *d = NULL; | |
403 | unsigned long flags; | |
404 | ||
405 | spin_lock_irqsave(&pool->lock, flags); | |
406 | if (!list_empty(&pool->free_list)) { | |
407 | d = list_first_entry(&pool->free_list, typeof(*d), entry); | |
408 | list_del(&d->entry); | |
409 | } | |
410 | spin_unlock_irqrestore(&pool->lock, flags); | |
411 | ||
412 | return d; | |
413 | } | |
414 | ||
415 | /** | |
416 | * srp_fr_pool_put() - put an FR descriptor back in the free list | |
417 | * @pool: Pool the descriptor was allocated from. | |
418 | * @desc: Pointer to an array of fast registration descriptor pointers. | |
419 | * @n: Number of descriptors to put back. | |
420 | * | |
421 | * Note: The caller must already have queued an invalidation request for | |
422 | * desc->mr->rkey before calling this function. | |
423 | */ | |
424 | static void srp_fr_pool_put(struct srp_fr_pool *pool, struct srp_fr_desc **desc, | |
425 | int n) | |
426 | { | |
427 | unsigned long flags; | |
428 | int i; | |
429 | ||
430 | spin_lock_irqsave(&pool->lock, flags); | |
431 | for (i = 0; i < n; i++) | |
432 | list_add(&desc[i]->entry, &pool->free_list); | |
433 | spin_unlock_irqrestore(&pool->lock, flags); | |
434 | } | |
435 | ||
436 | static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target) | |
437 | { | |
438 | struct srp_device *dev = target->srp_host->srp_dev; | |
439 | ||
440 | return srp_create_fr_pool(dev->dev, dev->pd, | |
441 | target->scsi_host->can_queue, | |
442 | dev->max_pages_per_mr); | |
443 | } | |
444 | ||
aef9ec39 RD |
445 | static int srp_create_target_ib(struct srp_target_port *target) |
446 | { | |
62154b2e | 447 | struct srp_device *dev = target->srp_host->srp_dev; |
aef9ec39 | 448 | struct ib_qp_init_attr *init_attr; |
73aa89ed IR |
449 | struct ib_cq *recv_cq, *send_cq; |
450 | struct ib_qp *qp; | |
d1b4289e | 451 | struct ib_fmr_pool *fmr_pool = NULL; |
5cfb1782 BVA |
452 | struct srp_fr_pool *fr_pool = NULL; |
453 | const int m = 1 + dev->use_fast_reg; | |
aef9ec39 RD |
454 | int ret; |
455 | ||
456 | init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); | |
457 | if (!init_attr) | |
458 | return -ENOMEM; | |
459 | ||
62154b2e | 460 | recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, target, |
4d73f95f | 461 | target->queue_size, target->comp_vector); |
73aa89ed IR |
462 | if (IS_ERR(recv_cq)) { |
463 | ret = PTR_ERR(recv_cq); | |
da9d2f07 | 464 | goto err; |
aef9ec39 RD |
465 | } |
466 | ||
62154b2e | 467 | send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, target, |
5cfb1782 | 468 | m * target->queue_size, target->comp_vector); |
73aa89ed IR |
469 | if (IS_ERR(send_cq)) { |
470 | ret = PTR_ERR(send_cq); | |
da9d2f07 | 471 | goto err_recv_cq; |
9c03dc9f BVA |
472 | } |
473 | ||
73aa89ed | 474 | ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP); |
aef9ec39 RD |
475 | |
476 | init_attr->event_handler = srp_qp_event; | |
5cfb1782 | 477 | init_attr->cap.max_send_wr = m * target->queue_size; |
4d73f95f | 478 | init_attr->cap.max_recv_wr = target->queue_size; |
aef9ec39 RD |
479 | init_attr->cap.max_recv_sge = 1; |
480 | init_attr->cap.max_send_sge = 1; | |
5cfb1782 | 481 | init_attr->sq_sig_type = IB_SIGNAL_REQ_WR; |
aef9ec39 | 482 | init_attr->qp_type = IB_QPT_RC; |
73aa89ed IR |
483 | init_attr->send_cq = send_cq; |
484 | init_attr->recv_cq = recv_cq; | |
aef9ec39 | 485 | |
62154b2e | 486 | qp = ib_create_qp(dev->pd, init_attr); |
73aa89ed IR |
487 | if (IS_ERR(qp)) { |
488 | ret = PTR_ERR(qp); | |
da9d2f07 | 489 | goto err_send_cq; |
aef9ec39 RD |
490 | } |
491 | ||
73aa89ed | 492 | ret = srp_init_qp(target, qp); |
da9d2f07 RD |
493 | if (ret) |
494 | goto err_qp; | |
aef9ec39 | 495 | |
5cfb1782 BVA |
496 | if (dev->use_fast_reg && dev->has_fr) { |
497 | fr_pool = srp_alloc_fr_pool(target); | |
498 | if (IS_ERR(fr_pool)) { | |
499 | ret = PTR_ERR(fr_pool); | |
500 | shost_printk(KERN_WARNING, target->scsi_host, PFX | |
501 | "FR pool allocation failed (%d)\n", ret); | |
502 | goto err_qp; | |
503 | } | |
504 | if (target->fr_pool) | |
505 | srp_destroy_fr_pool(target->fr_pool); | |
506 | target->fr_pool = fr_pool; | |
507 | } else if (!dev->use_fast_reg && dev->has_fmr) { | |
d1b4289e BVA |
508 | fmr_pool = srp_alloc_fmr_pool(target); |
509 | if (IS_ERR(fmr_pool)) { | |
510 | ret = PTR_ERR(fmr_pool); | |
511 | shost_printk(KERN_WARNING, target->scsi_host, PFX | |
512 | "FMR pool allocation failed (%d)\n", ret); | |
513 | goto err_qp; | |
514 | } | |
515 | if (target->fmr_pool) | |
516 | ib_destroy_fmr_pool(target->fmr_pool); | |
517 | target->fmr_pool = fmr_pool; | |
518 | } | |
519 | ||
73aa89ed IR |
520 | if (target->qp) |
521 | ib_destroy_qp(target->qp); | |
522 | if (target->recv_cq) | |
523 | ib_destroy_cq(target->recv_cq); | |
524 | if (target->send_cq) | |
525 | ib_destroy_cq(target->send_cq); | |
526 | ||
527 | target->qp = qp; | |
528 | target->recv_cq = recv_cq; | |
529 | target->send_cq = send_cq; | |
530 | ||
da9d2f07 RD |
531 | kfree(init_attr); |
532 | return 0; | |
533 | ||
534 | err_qp: | |
73aa89ed | 535 | ib_destroy_qp(qp); |
da9d2f07 RD |
536 | |
537 | err_send_cq: | |
73aa89ed | 538 | ib_destroy_cq(send_cq); |
da9d2f07 RD |
539 | |
540 | err_recv_cq: | |
73aa89ed | 541 | ib_destroy_cq(recv_cq); |
da9d2f07 RD |
542 | |
543 | err: | |
aef9ec39 RD |
544 | kfree(init_attr); |
545 | return ret; | |
546 | } | |
547 | ||
4d73f95f BVA |
548 | /* |
549 | * Note: this function may be called without srp_alloc_iu_bufs() having been | |
550 | * invoked. Hence the target->[rt]x_ring checks. | |
551 | */ | |
aef9ec39 RD |
552 | static void srp_free_target_ib(struct srp_target_port *target) |
553 | { | |
5cfb1782 | 554 | struct srp_device *dev = target->srp_host->srp_dev; |
aef9ec39 RD |
555 | int i; |
556 | ||
5cfb1782 BVA |
557 | if (dev->use_fast_reg) { |
558 | if (target->fr_pool) | |
559 | srp_destroy_fr_pool(target->fr_pool); | |
560 | } else { | |
561 | if (target->fmr_pool) | |
562 | ib_destroy_fmr_pool(target->fmr_pool); | |
563 | } | |
aef9ec39 | 564 | ib_destroy_qp(target->qp); |
9c03dc9f BVA |
565 | ib_destroy_cq(target->send_cq); |
566 | ib_destroy_cq(target->recv_cq); | |
aef9ec39 | 567 | |
73aa89ed IR |
568 | target->qp = NULL; |
569 | target->send_cq = target->recv_cq = NULL; | |
570 | ||
4d73f95f BVA |
571 | if (target->rx_ring) { |
572 | for (i = 0; i < target->queue_size; ++i) | |
573 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
574 | kfree(target->rx_ring); | |
575 | target->rx_ring = NULL; | |
576 | } | |
577 | if (target->tx_ring) { | |
578 | for (i = 0; i < target->queue_size; ++i) | |
579 | srp_free_iu(target->srp_host, target->tx_ring[i]); | |
580 | kfree(target->tx_ring); | |
581 | target->tx_ring = NULL; | |
582 | } | |
aef9ec39 RD |
583 | } |
584 | ||
585 | static void srp_path_rec_completion(int status, | |
586 | struct ib_sa_path_rec *pathrec, | |
587 | void *target_ptr) | |
588 | { | |
589 | struct srp_target_port *target = target_ptr; | |
590 | ||
591 | target->status = status; | |
592 | if (status) | |
7aa54bd7 DD |
593 | shost_printk(KERN_ERR, target->scsi_host, |
594 | PFX "Got failed path rec status %d\n", status); | |
aef9ec39 RD |
595 | else |
596 | target->path = *pathrec; | |
597 | complete(&target->done); | |
598 | } | |
599 | ||
600 | static int srp_lookup_path(struct srp_target_port *target) | |
601 | { | |
a702adce BVA |
602 | int ret; |
603 | ||
aef9ec39 RD |
604 | target->path.numb_path = 1; |
605 | ||
606 | init_completion(&target->done); | |
607 | ||
c1a0b23b | 608 | target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, |
05321937 | 609 | target->srp_host->srp_dev->dev, |
aef9ec39 RD |
610 | target->srp_host->port, |
611 | &target->path, | |
247e020e | 612 | IB_SA_PATH_REC_SERVICE_ID | |
aef9ec39 RD |
613 | IB_SA_PATH_REC_DGID | |
614 | IB_SA_PATH_REC_SGID | | |
615 | IB_SA_PATH_REC_NUMB_PATH | | |
616 | IB_SA_PATH_REC_PKEY, | |
617 | SRP_PATH_REC_TIMEOUT_MS, | |
618 | GFP_KERNEL, | |
619 | srp_path_rec_completion, | |
620 | target, &target->path_query); | |
621 | if (target->path_query_id < 0) | |
622 | return target->path_query_id; | |
623 | ||
a702adce BVA |
624 | ret = wait_for_completion_interruptible(&target->done); |
625 | if (ret < 0) | |
626 | return ret; | |
aef9ec39 RD |
627 | |
628 | if (target->status < 0) | |
7aa54bd7 DD |
629 | shost_printk(KERN_WARNING, target->scsi_host, |
630 | PFX "Path record query failed\n"); | |
aef9ec39 RD |
631 | |
632 | return target->status; | |
633 | } | |
634 | ||
635 | static int srp_send_req(struct srp_target_port *target) | |
636 | { | |
637 | struct { | |
638 | struct ib_cm_req_param param; | |
639 | struct srp_login_req priv; | |
640 | } *req = NULL; | |
641 | int status; | |
642 | ||
643 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
644 | if (!req) | |
645 | return -ENOMEM; | |
646 | ||
647 | req->param.primary_path = &target->path; | |
648 | req->param.alternate_path = NULL; | |
649 | req->param.service_id = target->service_id; | |
650 | req->param.qp_num = target->qp->qp_num; | |
651 | req->param.qp_type = target->qp->qp_type; | |
652 | req->param.private_data = &req->priv; | |
653 | req->param.private_data_len = sizeof req->priv; | |
654 | req->param.flow_control = 1; | |
655 | ||
656 | get_random_bytes(&req->param.starting_psn, 4); | |
657 | req->param.starting_psn &= 0xffffff; | |
658 | ||
659 | /* | |
660 | * Pick some arbitrary defaults here; we could make these | |
661 | * module parameters if anyone cared about setting them. | |
662 | */ | |
663 | req->param.responder_resources = 4; | |
664 | req->param.remote_cm_response_timeout = 20; | |
665 | req->param.local_cm_response_timeout = 20; | |
7bb312e4 | 666 | req->param.retry_count = target->tl_retry_count; |
aef9ec39 RD |
667 | req->param.rnr_retry_count = 7; |
668 | req->param.max_cm_retries = 15; | |
669 | ||
670 | req->priv.opcode = SRP_LOGIN_REQ; | |
671 | req->priv.tag = 0; | |
49248644 | 672 | req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len); |
aef9ec39 RD |
673 | req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
674 | SRP_BUF_FORMAT_INDIRECT); | |
0c0450db | 675 | /* |
3cd96564 | 676 | * In the published SRP specification (draft rev. 16a), the |
0c0450db R |
677 | * port identifier format is 8 bytes of ID extension followed |
678 | * by 8 bytes of GUID. Older drafts put the two halves in the | |
679 | * opposite order, so that the GUID comes first. | |
680 | * | |
681 | * Targets conforming to these obsolete drafts can be | |
682 | * recognized by the I/O Class they report. | |
683 | */ | |
684 | if (target->io_class == SRP_REV10_IB_IO_CLASS) { | |
685 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb | 686 | &target->path.sgid.global.interface_id, 8); |
0c0450db | 687 | memcpy(req->priv.initiator_port_id + 8, |
01cb9bcb | 688 | &target->initiator_ext, 8); |
0c0450db R |
689 | memcpy(req->priv.target_port_id, &target->ioc_guid, 8); |
690 | memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); | |
691 | } else { | |
692 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb IR |
693 | &target->initiator_ext, 8); |
694 | memcpy(req->priv.initiator_port_id + 8, | |
695 | &target->path.sgid.global.interface_id, 8); | |
0c0450db R |
696 | memcpy(req->priv.target_port_id, &target->id_ext, 8); |
697 | memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); | |
698 | } | |
699 | ||
aef9ec39 RD |
700 | /* |
701 | * Topspin/Cisco SRP targets will reject our login unless we | |
01cb9bcb IR |
702 | * zero out the first 8 bytes of our initiator port ID and set |
703 | * the second 8 bytes to the local node GUID. | |
aef9ec39 | 704 | */ |
5d7cbfd6 | 705 | if (srp_target_is_topspin(target)) { |
7aa54bd7 DD |
706 | shost_printk(KERN_DEBUG, target->scsi_host, |
707 | PFX "Topspin/Cisco initiator port ID workaround " | |
708 | "activated for target GUID %016llx\n", | |
709 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
aef9ec39 | 710 | memset(req->priv.initiator_port_id, 0, 8); |
01cb9bcb | 711 | memcpy(req->priv.initiator_port_id + 8, |
05321937 | 712 | &target->srp_host->srp_dev->dev->node_guid, 8); |
aef9ec39 | 713 | } |
aef9ec39 RD |
714 | |
715 | status = ib_send_cm_req(target->cm_id, &req->param); | |
716 | ||
717 | kfree(req); | |
718 | ||
719 | return status; | |
720 | } | |
721 | ||
ef6c49d8 BVA |
722 | static bool srp_queue_remove_work(struct srp_target_port *target) |
723 | { | |
724 | bool changed = false; | |
725 | ||
726 | spin_lock_irq(&target->lock); | |
727 | if (target->state != SRP_TARGET_REMOVED) { | |
728 | target->state = SRP_TARGET_REMOVED; | |
729 | changed = true; | |
730 | } | |
731 | spin_unlock_irq(&target->lock); | |
732 | ||
733 | if (changed) | |
734 | queue_work(system_long_wq, &target->remove_work); | |
735 | ||
736 | return changed; | |
737 | } | |
738 | ||
294c875a BVA |
739 | static bool srp_change_conn_state(struct srp_target_port *target, |
740 | bool connected) | |
741 | { | |
742 | bool changed = false; | |
743 | ||
744 | spin_lock_irq(&target->lock); | |
745 | if (target->connected != connected) { | |
746 | target->connected = connected; | |
747 | changed = true; | |
748 | } | |
749 | spin_unlock_irq(&target->lock); | |
750 | ||
751 | return changed; | |
752 | } | |
753 | ||
aef9ec39 RD |
754 | static void srp_disconnect_target(struct srp_target_port *target) |
755 | { | |
294c875a BVA |
756 | if (srp_change_conn_state(target, false)) { |
757 | /* XXX should send SRP_I_LOGOUT request */ | |
aef9ec39 | 758 | |
294c875a BVA |
759 | if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { |
760 | shost_printk(KERN_DEBUG, target->scsi_host, | |
761 | PFX "Sending CM DREQ failed\n"); | |
294c875a | 762 | } |
e6581056 | 763 | } |
aef9ec39 RD |
764 | } |
765 | ||
8f26c9ff DD |
766 | static void srp_free_req_data(struct srp_target_port *target) |
767 | { | |
5cfb1782 BVA |
768 | struct srp_device *dev = target->srp_host->srp_dev; |
769 | struct ib_device *ibdev = dev->dev; | |
8f26c9ff DD |
770 | struct srp_request *req; |
771 | int i; | |
772 | ||
4d73f95f BVA |
773 | if (!target->req_ring) |
774 | return; | |
775 | ||
776 | for (i = 0; i < target->req_ring_size; ++i) { | |
777 | req = &target->req_ring[i]; | |
5cfb1782 BVA |
778 | if (dev->use_fast_reg) |
779 | kfree(req->fr_list); | |
780 | else | |
781 | kfree(req->fmr_list); | |
8f26c9ff | 782 | kfree(req->map_page); |
c07d424d DD |
783 | if (req->indirect_dma_addr) { |
784 | ib_dma_unmap_single(ibdev, req->indirect_dma_addr, | |
785 | target->indirect_size, | |
786 | DMA_TO_DEVICE); | |
787 | } | |
788 | kfree(req->indirect_desc); | |
8f26c9ff | 789 | } |
4d73f95f BVA |
790 | |
791 | kfree(target->req_ring); | |
792 | target->req_ring = NULL; | |
8f26c9ff DD |
793 | } |
794 | ||
b81d00bd BVA |
795 | static int srp_alloc_req_data(struct srp_target_port *target) |
796 | { | |
797 | struct srp_device *srp_dev = target->srp_host->srp_dev; | |
798 | struct ib_device *ibdev = srp_dev->dev; | |
799 | struct srp_request *req; | |
5cfb1782 | 800 | void *mr_list; |
b81d00bd BVA |
801 | dma_addr_t dma_addr; |
802 | int i, ret = -ENOMEM; | |
803 | ||
804 | INIT_LIST_HEAD(&target->free_reqs); | |
805 | ||
4d73f95f BVA |
806 | target->req_ring = kzalloc(target->req_ring_size * |
807 | sizeof(*target->req_ring), GFP_KERNEL); | |
808 | if (!target->req_ring) | |
809 | goto out; | |
810 | ||
811 | for (i = 0; i < target->req_ring_size; ++i) { | |
b81d00bd | 812 | req = &target->req_ring[i]; |
5cfb1782 BVA |
813 | mr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *), |
814 | GFP_KERNEL); | |
815 | if (!mr_list) | |
816 | goto out; | |
817 | if (srp_dev->use_fast_reg) | |
818 | req->fr_list = mr_list; | |
819 | else | |
820 | req->fmr_list = mr_list; | |
52ede08f | 821 | req->map_page = kmalloc(srp_dev->max_pages_per_mr * |
d1b4289e | 822 | sizeof(void *), GFP_KERNEL); |
5cfb1782 BVA |
823 | if (!req->map_page) |
824 | goto out; | |
b81d00bd | 825 | req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL); |
5cfb1782 | 826 | if (!req->indirect_desc) |
b81d00bd BVA |
827 | goto out; |
828 | ||
829 | dma_addr = ib_dma_map_single(ibdev, req->indirect_desc, | |
830 | target->indirect_size, | |
831 | DMA_TO_DEVICE); | |
832 | if (ib_dma_mapping_error(ibdev, dma_addr)) | |
833 | goto out; | |
834 | ||
835 | req->indirect_dma_addr = dma_addr; | |
836 | req->index = i; | |
837 | list_add_tail(&req->list, &target->free_reqs); | |
838 | } | |
839 | ret = 0; | |
840 | ||
841 | out: | |
842 | return ret; | |
843 | } | |
844 | ||
683b159a BVA |
845 | /** |
846 | * srp_del_scsi_host_attr() - Remove attributes defined in the host template. | |
847 | * @shost: SCSI host whose attributes to remove from sysfs. | |
848 | * | |
849 | * Note: Any attributes defined in the host template and that did not exist | |
850 | * before invocation of this function will be ignored. | |
851 | */ | |
852 | static void srp_del_scsi_host_attr(struct Scsi_Host *shost) | |
853 | { | |
854 | struct device_attribute **attr; | |
855 | ||
856 | for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr) | |
857 | device_remove_file(&shost->shost_dev, *attr); | |
858 | } | |
859 | ||
ee12d6a8 BVA |
860 | static void srp_remove_target(struct srp_target_port *target) |
861 | { | |
ef6c49d8 BVA |
862 | WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); |
863 | ||
ee12d6a8 | 864 | srp_del_scsi_host_attr(target->scsi_host); |
9dd69a60 | 865 | srp_rport_get(target->rport); |
ee12d6a8 BVA |
866 | srp_remove_host(target->scsi_host); |
867 | scsi_remove_host(target->scsi_host); | |
93079162 | 868 | srp_stop_rport_timers(target->rport); |
ef6c49d8 | 869 | srp_disconnect_target(target); |
ee12d6a8 BVA |
870 | ib_destroy_cm_id(target->cm_id); |
871 | srp_free_target_ib(target); | |
c1120f89 | 872 | cancel_work_sync(&target->tl_err_work); |
9dd69a60 | 873 | srp_rport_put(target->rport); |
ee12d6a8 | 874 | srp_free_req_data(target); |
65d7dd2f VP |
875 | |
876 | spin_lock(&target->srp_host->target_lock); | |
877 | list_del(&target->list); | |
878 | spin_unlock(&target->srp_host->target_lock); | |
879 | ||
ee12d6a8 BVA |
880 | scsi_host_put(target->scsi_host); |
881 | } | |
882 | ||
c4028958 | 883 | static void srp_remove_work(struct work_struct *work) |
aef9ec39 | 884 | { |
c4028958 | 885 | struct srp_target_port *target = |
ef6c49d8 | 886 | container_of(work, struct srp_target_port, remove_work); |
aef9ec39 | 887 | |
ef6c49d8 | 888 | WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); |
aef9ec39 | 889 | |
96fc248a | 890 | srp_remove_target(target); |
aef9ec39 RD |
891 | } |
892 | ||
dc1bdbd9 BVA |
893 | static void srp_rport_delete(struct srp_rport *rport) |
894 | { | |
895 | struct srp_target_port *target = rport->lld_data; | |
896 | ||
897 | srp_queue_remove_work(target); | |
898 | } | |
899 | ||
aef9ec39 RD |
900 | static int srp_connect_target(struct srp_target_port *target) |
901 | { | |
9fe4bcf4 | 902 | int retries = 3; |
aef9ec39 RD |
903 | int ret; |
904 | ||
294c875a BVA |
905 | WARN_ON_ONCE(target->connected); |
906 | ||
948d1e88 BVA |
907 | target->qp_in_error = false; |
908 | ||
aef9ec39 RD |
909 | ret = srp_lookup_path(target); |
910 | if (ret) | |
911 | return ret; | |
912 | ||
913 | while (1) { | |
914 | init_completion(&target->done); | |
915 | ret = srp_send_req(target); | |
916 | if (ret) | |
917 | return ret; | |
a702adce BVA |
918 | ret = wait_for_completion_interruptible(&target->done); |
919 | if (ret < 0) | |
920 | return ret; | |
aef9ec39 RD |
921 | |
922 | /* | |
923 | * The CM event handling code will set status to | |
924 | * SRP_PORT_REDIRECT if we get a port redirect REJ | |
925 | * back, or SRP_DLID_REDIRECT if we get a lid/qp | |
926 | * redirect REJ back. | |
927 | */ | |
928 | switch (target->status) { | |
929 | case 0: | |
294c875a | 930 | srp_change_conn_state(target, true); |
aef9ec39 RD |
931 | return 0; |
932 | ||
933 | case SRP_PORT_REDIRECT: | |
934 | ret = srp_lookup_path(target); | |
935 | if (ret) | |
936 | return ret; | |
937 | break; | |
938 | ||
939 | case SRP_DLID_REDIRECT: | |
940 | break; | |
941 | ||
9fe4bcf4 DD |
942 | case SRP_STALE_CONN: |
943 | /* Our current CM id was stale, and is now in timewait. | |
944 | * Try to reconnect with a new one. | |
945 | */ | |
946 | if (!retries-- || srp_new_cm_id(target)) { | |
947 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
948 | "giving up on stale connection\n"); | |
949 | target->status = -ECONNRESET; | |
950 | return target->status; | |
951 | } | |
952 | ||
953 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
954 | "retrying stale connection\n"); | |
955 | break; | |
956 | ||
aef9ec39 RD |
957 | default: |
958 | return target->status; | |
959 | } | |
960 | } | |
961 | } | |
962 | ||
5cfb1782 BVA |
963 | static int srp_inv_rkey(struct srp_target_port *target, u32 rkey) |
964 | { | |
965 | struct ib_send_wr *bad_wr; | |
966 | struct ib_send_wr wr = { | |
967 | .opcode = IB_WR_LOCAL_INV, | |
968 | .wr_id = LOCAL_INV_WR_ID_MASK, | |
969 | .next = NULL, | |
970 | .num_sge = 0, | |
971 | .send_flags = 0, | |
972 | .ex.invalidate_rkey = rkey, | |
973 | }; | |
974 | ||
975 | return ib_post_send(target->qp, &wr, &bad_wr); | |
976 | } | |
977 | ||
d945e1df RD |
978 | static void srp_unmap_data(struct scsi_cmnd *scmnd, |
979 | struct srp_target_port *target, | |
980 | struct srp_request *req) | |
981 | { | |
5cfb1782 BVA |
982 | struct srp_device *dev = target->srp_host->srp_dev; |
983 | struct ib_device *ibdev = dev->dev; | |
984 | int i, res; | |
8f26c9ff | 985 | |
bb350d1d | 986 | if (!scsi_sglist(scmnd) || |
d945e1df RD |
987 | (scmnd->sc_data_direction != DMA_TO_DEVICE && |
988 | scmnd->sc_data_direction != DMA_FROM_DEVICE)) | |
989 | return; | |
990 | ||
5cfb1782 BVA |
991 | if (dev->use_fast_reg) { |
992 | struct srp_fr_desc **pfr; | |
993 | ||
994 | for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) { | |
995 | res = srp_inv_rkey(target, (*pfr)->mr->rkey); | |
996 | if (res < 0) { | |
997 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
998 | "Queueing INV WR for rkey %#x failed (%d)\n", | |
999 | (*pfr)->mr->rkey, res); | |
1000 | queue_work(system_long_wq, | |
1001 | &target->tl_err_work); | |
1002 | } | |
1003 | } | |
1004 | if (req->nmdesc) | |
1005 | srp_fr_pool_put(target->fr_pool, req->fr_list, | |
1006 | req->nmdesc); | |
1007 | } else { | |
1008 | struct ib_pool_fmr **pfmr; | |
1009 | ||
1010 | for (i = req->nmdesc, pfmr = req->fmr_list; i > 0; i--, pfmr++) | |
1011 | ib_fmr_pool_unmap(*pfmr); | |
1012 | } | |
f5358a17 | 1013 | |
8f26c9ff DD |
1014 | ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd), |
1015 | scmnd->sc_data_direction); | |
d945e1df RD |
1016 | } |
1017 | ||
22032991 BVA |
1018 | /** |
1019 | * srp_claim_req - Take ownership of the scmnd associated with a request. | |
1020 | * @target: SRP target port. | |
1021 | * @req: SRP request. | |
b3fe628d | 1022 | * @sdev: If not NULL, only take ownership for this SCSI device. |
22032991 BVA |
1023 | * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take |
1024 | * ownership of @req->scmnd if it equals @scmnd. | |
1025 | * | |
1026 | * Return value: | |
1027 | * Either NULL or a pointer to the SCSI command the caller became owner of. | |
1028 | */ | |
1029 | static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target, | |
1030 | struct srp_request *req, | |
b3fe628d | 1031 | struct scsi_device *sdev, |
22032991 BVA |
1032 | struct scsi_cmnd *scmnd) |
1033 | { | |
1034 | unsigned long flags; | |
1035 | ||
1036 | spin_lock_irqsave(&target->lock, flags); | |
b3fe628d BVA |
1037 | if (req->scmnd && |
1038 | (!sdev || req->scmnd->device == sdev) && | |
1039 | (!scmnd || req->scmnd == scmnd)) { | |
22032991 BVA |
1040 | scmnd = req->scmnd; |
1041 | req->scmnd = NULL; | |
22032991 BVA |
1042 | } else { |
1043 | scmnd = NULL; | |
1044 | } | |
1045 | spin_unlock_irqrestore(&target->lock, flags); | |
1046 | ||
1047 | return scmnd; | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * srp_free_req() - Unmap data and add request to the free request list. | |
af24663b BVA |
1052 | * @target: SRP target port. |
1053 | * @req: Request to be freed. | |
1054 | * @scmnd: SCSI command associated with @req. | |
1055 | * @req_lim_delta: Amount to be added to @target->req_lim. | |
22032991 BVA |
1056 | */ |
1057 | static void srp_free_req(struct srp_target_port *target, | |
1058 | struct srp_request *req, struct scsi_cmnd *scmnd, | |
1059 | s32 req_lim_delta) | |
526b4caa | 1060 | { |
94a9174c BVA |
1061 | unsigned long flags; |
1062 | ||
22032991 BVA |
1063 | srp_unmap_data(scmnd, target, req); |
1064 | ||
e9684678 | 1065 | spin_lock_irqsave(&target->lock, flags); |
94a9174c | 1066 | target->req_lim += req_lim_delta; |
536ae14e | 1067 | list_add_tail(&req->list, &target->free_reqs); |
e9684678 | 1068 | spin_unlock_irqrestore(&target->lock, flags); |
526b4caa IR |
1069 | } |
1070 | ||
ed9b2264 | 1071 | static void srp_finish_req(struct srp_target_port *target, |
b3fe628d BVA |
1072 | struct srp_request *req, struct scsi_device *sdev, |
1073 | int result) | |
526b4caa | 1074 | { |
b3fe628d | 1075 | struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL); |
22032991 BVA |
1076 | |
1077 | if (scmnd) { | |
9b796d06 | 1078 | srp_free_req(target, req, scmnd, 0); |
ed9b2264 | 1079 | scmnd->result = result; |
22032991 | 1080 | scmnd->scsi_done(scmnd); |
22032991 | 1081 | } |
526b4caa IR |
1082 | } |
1083 | ||
ed9b2264 | 1084 | static void srp_terminate_io(struct srp_rport *rport) |
aef9ec39 | 1085 | { |
ed9b2264 | 1086 | struct srp_target_port *target = rport->lld_data; |
b3fe628d BVA |
1087 | struct Scsi_Host *shost = target->scsi_host; |
1088 | struct scsi_device *sdev; | |
ed9b2264 BVA |
1089 | int i; |
1090 | ||
b3fe628d BVA |
1091 | /* |
1092 | * Invoking srp_terminate_io() while srp_queuecommand() is running | |
1093 | * is not safe. Hence the warning statement below. | |
1094 | */ | |
1095 | shost_for_each_device(sdev, shost) | |
1096 | WARN_ON_ONCE(sdev->request_queue->request_fn_active); | |
1097 | ||
4d73f95f | 1098 | for (i = 0; i < target->req_ring_size; ++i) { |
ed9b2264 | 1099 | struct srp_request *req = &target->req_ring[i]; |
b3fe628d | 1100 | srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16); |
ed9b2264 BVA |
1101 | } |
1102 | } | |
aef9ec39 | 1103 | |
ed9b2264 BVA |
1104 | /* |
1105 | * It is up to the caller to ensure that srp_rport_reconnect() calls are | |
1106 | * serialized and that no concurrent srp_queuecommand(), srp_abort(), | |
1107 | * srp_reset_device() or srp_reset_host() calls will occur while this function | |
1108 | * is in progress. One way to realize that is not to call this function | |
1109 | * directly but to call srp_reconnect_rport() instead since that last function | |
1110 | * serializes calls of this function via rport->mutex and also blocks | |
1111 | * srp_queuecommand() calls before invoking this function. | |
1112 | */ | |
1113 | static int srp_rport_reconnect(struct srp_rport *rport) | |
1114 | { | |
1115 | struct srp_target_port *target = rport->lld_data; | |
1116 | int i, ret; | |
09be70a2 | 1117 | |
aef9ec39 RD |
1118 | srp_disconnect_target(target); |
1119 | /* | |
c7c4e7ff BVA |
1120 | * Now get a new local CM ID so that we avoid confusing the target in |
1121 | * case things are really fouled up. Doing so also ensures that all CM | |
1122 | * callbacks will have finished before a new QP is allocated. | |
aef9ec39 | 1123 | */ |
9fe4bcf4 | 1124 | ret = srp_new_cm_id(target); |
aef9ec39 | 1125 | |
4d73f95f | 1126 | for (i = 0; i < target->req_ring_size; ++i) { |
536ae14e | 1127 | struct srp_request *req = &target->req_ring[i]; |
b3fe628d | 1128 | srp_finish_req(target, req, NULL, DID_RESET << 16); |
536ae14e | 1129 | } |
aef9ec39 | 1130 | |
5cfb1782 BVA |
1131 | /* |
1132 | * Whether or not creating a new CM ID succeeded, create a new | |
1133 | * QP. This guarantees that all callback functions for the old QP have | |
1134 | * finished before any send requests are posted on the new QP. | |
1135 | */ | |
1136 | ret += srp_create_target_ib(target); | |
1137 | ||
536ae14e | 1138 | INIT_LIST_HEAD(&target->free_tx); |
4d73f95f | 1139 | for (i = 0; i < target->queue_size; ++i) |
536ae14e | 1140 | list_add(&target->tx_ring[i]->list, &target->free_tx); |
aef9ec39 | 1141 | |
c7c4e7ff BVA |
1142 | if (ret == 0) |
1143 | ret = srp_connect_target(target); | |
09be70a2 | 1144 | |
ed9b2264 BVA |
1145 | if (ret == 0) |
1146 | shost_printk(KERN_INFO, target->scsi_host, | |
1147 | PFX "reconnect succeeded\n"); | |
aef9ec39 RD |
1148 | |
1149 | return ret; | |
1150 | } | |
1151 | ||
8f26c9ff DD |
1152 | static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr, |
1153 | unsigned int dma_len, u32 rkey) | |
f5358a17 | 1154 | { |
8f26c9ff | 1155 | struct srp_direct_buf *desc = state->desc; |
f5358a17 | 1156 | |
8f26c9ff DD |
1157 | desc->va = cpu_to_be64(dma_addr); |
1158 | desc->key = cpu_to_be32(rkey); | |
1159 | desc->len = cpu_to_be32(dma_len); | |
f5358a17 | 1160 | |
8f26c9ff DD |
1161 | state->total_len += dma_len; |
1162 | state->desc++; | |
1163 | state->ndesc++; | |
1164 | } | |
559ce8f1 | 1165 | |
8f26c9ff DD |
1166 | static int srp_map_finish_fmr(struct srp_map_state *state, |
1167 | struct srp_target_port *target) | |
1168 | { | |
8f26c9ff DD |
1169 | struct ib_pool_fmr *fmr; |
1170 | u64 io_addr = 0; | |
85507bcc | 1171 | |
d1b4289e | 1172 | fmr = ib_fmr_pool_map_phys(target->fmr_pool, state->pages, |
8f26c9ff DD |
1173 | state->npages, io_addr); |
1174 | if (IS_ERR(fmr)) | |
1175 | return PTR_ERR(fmr); | |
f5358a17 | 1176 | |
8f26c9ff | 1177 | *state->next_fmr++ = fmr; |
52ede08f | 1178 | state->nmdesc++; |
f5358a17 | 1179 | |
52ede08f | 1180 | srp_map_desc(state, 0, state->dma_len, fmr->fmr->rkey); |
539dde6f | 1181 | |
8f26c9ff DD |
1182 | return 0; |
1183 | } | |
1184 | ||
5cfb1782 BVA |
1185 | static int srp_map_finish_fr(struct srp_map_state *state, |
1186 | struct srp_target_port *target) | |
1187 | { | |
1188 | struct srp_device *dev = target->srp_host->srp_dev; | |
1189 | struct ib_send_wr *bad_wr; | |
1190 | struct ib_send_wr wr; | |
1191 | struct srp_fr_desc *desc; | |
1192 | u32 rkey; | |
1193 | ||
1194 | desc = srp_fr_pool_get(target->fr_pool); | |
1195 | if (!desc) | |
1196 | return -ENOMEM; | |
1197 | ||
1198 | rkey = ib_inc_rkey(desc->mr->rkey); | |
1199 | ib_update_fast_reg_key(desc->mr, rkey); | |
1200 | ||
1201 | memcpy(desc->frpl->page_list, state->pages, | |
1202 | sizeof(state->pages[0]) * state->npages); | |
1203 | ||
1204 | memset(&wr, 0, sizeof(wr)); | |
1205 | wr.opcode = IB_WR_FAST_REG_MR; | |
1206 | wr.wr_id = FAST_REG_WR_ID_MASK; | |
1207 | wr.wr.fast_reg.iova_start = state->base_dma_addr; | |
1208 | wr.wr.fast_reg.page_list = desc->frpl; | |
1209 | wr.wr.fast_reg.page_list_len = state->npages; | |
1210 | wr.wr.fast_reg.page_shift = ilog2(dev->mr_page_size); | |
1211 | wr.wr.fast_reg.length = state->dma_len; | |
1212 | wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE | | |
1213 | IB_ACCESS_REMOTE_READ | | |
1214 | IB_ACCESS_REMOTE_WRITE); | |
1215 | wr.wr.fast_reg.rkey = desc->mr->lkey; | |
1216 | ||
1217 | *state->next_fr++ = desc; | |
1218 | state->nmdesc++; | |
1219 | ||
1220 | srp_map_desc(state, state->base_dma_addr, state->dma_len, | |
1221 | desc->mr->rkey); | |
1222 | ||
1223 | return ib_post_send(target->qp, &wr, &bad_wr); | |
1224 | } | |
1225 | ||
539dde6f BVA |
1226 | static int srp_finish_mapping(struct srp_map_state *state, |
1227 | struct srp_target_port *target) | |
1228 | { | |
1229 | int ret = 0; | |
1230 | ||
1231 | if (state->npages == 0) | |
1232 | return 0; | |
1233 | ||
b1b8854d | 1234 | if (state->npages == 1 && !register_always) |
52ede08f | 1235 | srp_map_desc(state, state->base_dma_addr, state->dma_len, |
539dde6f BVA |
1236 | target->rkey); |
1237 | else | |
5cfb1782 BVA |
1238 | ret = target->srp_host->srp_dev->use_fast_reg ? |
1239 | srp_map_finish_fr(state, target) : | |
1240 | srp_map_finish_fmr(state, target); | |
539dde6f BVA |
1241 | |
1242 | if (ret == 0) { | |
1243 | state->npages = 0; | |
52ede08f | 1244 | state->dma_len = 0; |
539dde6f BVA |
1245 | } |
1246 | ||
1247 | return ret; | |
1248 | } | |
1249 | ||
8f26c9ff DD |
1250 | static void srp_map_update_start(struct srp_map_state *state, |
1251 | struct scatterlist *sg, int sg_index, | |
1252 | dma_addr_t dma_addr) | |
1253 | { | |
1254 | state->unmapped_sg = sg; | |
1255 | state->unmapped_index = sg_index; | |
1256 | state->unmapped_addr = dma_addr; | |
1257 | } | |
85507bcc | 1258 | |
8f26c9ff DD |
1259 | static int srp_map_sg_entry(struct srp_map_state *state, |
1260 | struct srp_target_port *target, | |
1261 | struct scatterlist *sg, int sg_index, | |
5cfb1782 | 1262 | bool use_mr) |
8f26c9ff DD |
1263 | { |
1264 | struct srp_device *dev = target->srp_host->srp_dev; | |
1265 | struct ib_device *ibdev = dev->dev; | |
1266 | dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg); | |
1267 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
1268 | unsigned int len; | |
1269 | int ret; | |
1270 | ||
1271 | if (!dma_len) | |
1272 | return 0; | |
1273 | ||
5cfb1782 BVA |
1274 | if (!use_mr) { |
1275 | /* | |
1276 | * Once we're in direct map mode for a request, we don't | |
1277 | * go back to FMR or FR mode, so no need to update anything | |
8f26c9ff DD |
1278 | * other than the descriptor. |
1279 | */ | |
1280 | srp_map_desc(state, dma_addr, dma_len, target->rkey); | |
1281 | return 0; | |
85507bcc | 1282 | } |
f5358a17 | 1283 | |
5cfb1782 BVA |
1284 | /* |
1285 | * Since not all RDMA HW drivers support non-zero page offsets for | |
1286 | * FMR, if we start at an offset into a page, don't merge into the | |
1287 | * current FMR mapping. Finish it out, and use the kernel's MR for | |
1288 | * this sg entry. | |
8f26c9ff | 1289 | */ |
5cfb1782 BVA |
1290 | if ((!dev->use_fast_reg && dma_addr & ~dev->mr_page_mask) || |
1291 | dma_len > dev->mr_max_size) { | |
539dde6f | 1292 | ret = srp_finish_mapping(state, target); |
8f26c9ff DD |
1293 | if (ret) |
1294 | return ret; | |
1295 | ||
1296 | srp_map_desc(state, dma_addr, dma_len, target->rkey); | |
1297 | srp_map_update_start(state, NULL, 0, 0); | |
1298 | return 0; | |
f5358a17 RD |
1299 | } |
1300 | ||
5cfb1782 BVA |
1301 | /* |
1302 | * If this is the first sg that will be mapped via FMR or via FR, save | |
1303 | * our position. We need to know the first unmapped entry, its index, | |
1304 | * and the first unmapped address within that entry to be able to | |
1305 | * restart mapping after an error. | |
8f26c9ff DD |
1306 | */ |
1307 | if (!state->unmapped_sg) | |
1308 | srp_map_update_start(state, sg, sg_index, dma_addr); | |
f5358a17 | 1309 | |
8f26c9ff | 1310 | while (dma_len) { |
5cfb1782 BVA |
1311 | unsigned offset = dma_addr & ~dev->mr_page_mask; |
1312 | if (state->npages == dev->max_pages_per_mr || offset != 0) { | |
539dde6f | 1313 | ret = srp_finish_mapping(state, target); |
8f26c9ff DD |
1314 | if (ret) |
1315 | return ret; | |
f5358a17 | 1316 | |
8f26c9ff DD |
1317 | srp_map_update_start(state, sg, sg_index, dma_addr); |
1318 | } | |
1319 | ||
5cfb1782 | 1320 | len = min_t(unsigned int, dma_len, dev->mr_page_size - offset); |
f5358a17 | 1321 | |
8f26c9ff DD |
1322 | if (!state->npages) |
1323 | state->base_dma_addr = dma_addr; | |
5cfb1782 | 1324 | state->pages[state->npages++] = dma_addr & dev->mr_page_mask; |
52ede08f | 1325 | state->dma_len += len; |
8f26c9ff DD |
1326 | dma_addr += len; |
1327 | dma_len -= len; | |
1328 | } | |
1329 | ||
5cfb1782 BVA |
1330 | /* |
1331 | * If the last entry of the MR wasn't a full page, then we need to | |
8f26c9ff DD |
1332 | * close it out and start a new one -- we can only merge at page |
1333 | * boundries. | |
1334 | */ | |
1335 | ret = 0; | |
52ede08f | 1336 | if (len != dev->mr_page_size) { |
539dde6f | 1337 | ret = srp_finish_mapping(state, target); |
8f26c9ff DD |
1338 | if (!ret) |
1339 | srp_map_update_start(state, NULL, 0, 0); | |
1340 | } | |
f5358a17 RD |
1341 | return ret; |
1342 | } | |
1343 | ||
5cfb1782 BVA |
1344 | static int srp_map_sg(struct srp_map_state *state, |
1345 | struct srp_target_port *target, struct srp_request *req, | |
1346 | struct scatterlist *scat, int count) | |
76bc1e1d BVA |
1347 | { |
1348 | struct srp_device *dev = target->srp_host->srp_dev; | |
1349 | struct ib_device *ibdev = dev->dev; | |
1350 | struct scatterlist *sg; | |
5cfb1782 BVA |
1351 | int i; |
1352 | bool use_mr; | |
76bc1e1d BVA |
1353 | |
1354 | state->desc = req->indirect_desc; | |
1355 | state->pages = req->map_page; | |
5cfb1782 BVA |
1356 | if (dev->use_fast_reg) { |
1357 | state->next_fr = req->fr_list; | |
1358 | use_mr = !!target->fr_pool; | |
1359 | } else { | |
1360 | state->next_fmr = req->fmr_list; | |
1361 | use_mr = !!target->fmr_pool; | |
1362 | } | |
76bc1e1d BVA |
1363 | |
1364 | for_each_sg(scat, sg, count, i) { | |
5cfb1782 BVA |
1365 | if (srp_map_sg_entry(state, target, sg, i, use_mr)) { |
1366 | /* | |
1367 | * Memory registration failed, so backtrack to the | |
1368 | * first unmapped entry and continue on without using | |
1369 | * memory registration. | |
76bc1e1d BVA |
1370 | */ |
1371 | dma_addr_t dma_addr; | |
1372 | unsigned int dma_len; | |
1373 | ||
1374 | backtrack: | |
1375 | sg = state->unmapped_sg; | |
1376 | i = state->unmapped_index; | |
1377 | ||
1378 | dma_addr = ib_sg_dma_address(ibdev, sg); | |
1379 | dma_len = ib_sg_dma_len(ibdev, sg); | |
1380 | dma_len -= (state->unmapped_addr - dma_addr); | |
1381 | dma_addr = state->unmapped_addr; | |
5cfb1782 | 1382 | use_mr = false; |
76bc1e1d BVA |
1383 | srp_map_desc(state, dma_addr, dma_len, target->rkey); |
1384 | } | |
1385 | } | |
1386 | ||
5cfb1782 | 1387 | if (use_mr && srp_finish_mapping(state, target)) |
76bc1e1d BVA |
1388 | goto backtrack; |
1389 | ||
52ede08f | 1390 | req->nmdesc = state->nmdesc; |
5cfb1782 BVA |
1391 | |
1392 | return 0; | |
76bc1e1d BVA |
1393 | } |
1394 | ||
aef9ec39 RD |
1395 | static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, |
1396 | struct srp_request *req) | |
1397 | { | |
76bc1e1d | 1398 | struct scatterlist *scat; |
aef9ec39 | 1399 | struct srp_cmd *cmd = req->cmd->buf; |
76bc1e1d | 1400 | int len, nents, count; |
85507bcc RC |
1401 | struct srp_device *dev; |
1402 | struct ib_device *ibdev; | |
8f26c9ff DD |
1403 | struct srp_map_state state; |
1404 | struct srp_indirect_buf *indirect_hdr; | |
8f26c9ff DD |
1405 | u32 table_len; |
1406 | u8 fmt; | |
aef9ec39 | 1407 | |
bb350d1d | 1408 | if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE) |
aef9ec39 RD |
1409 | return sizeof (struct srp_cmd); |
1410 | ||
1411 | if (scmnd->sc_data_direction != DMA_FROM_DEVICE && | |
1412 | scmnd->sc_data_direction != DMA_TO_DEVICE) { | |
7aa54bd7 DD |
1413 | shost_printk(KERN_WARNING, target->scsi_host, |
1414 | PFX "Unhandled data direction %d\n", | |
1415 | scmnd->sc_data_direction); | |
aef9ec39 RD |
1416 | return -EINVAL; |
1417 | } | |
1418 | ||
bb350d1d FT |
1419 | nents = scsi_sg_count(scmnd); |
1420 | scat = scsi_sglist(scmnd); | |
aef9ec39 | 1421 | |
05321937 | 1422 | dev = target->srp_host->srp_dev; |
85507bcc RC |
1423 | ibdev = dev->dev; |
1424 | ||
1425 | count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); | |
8f26c9ff DD |
1426 | if (unlikely(count == 0)) |
1427 | return -EIO; | |
f5358a17 RD |
1428 | |
1429 | fmt = SRP_DATA_DESC_DIRECT; | |
1430 | len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); | |
aef9ec39 | 1431 | |
b1b8854d | 1432 | if (count == 1 && !register_always) { |
f5358a17 RD |
1433 | /* |
1434 | * The midlayer only generated a single gather/scatter | |
1435 | * entry, or DMA mapping coalesced everything to a | |
1436 | * single entry. So a direct descriptor along with | |
1437 | * the DMA MR suffices. | |
1438 | */ | |
cf368713 | 1439 | struct srp_direct_buf *buf = (void *) cmd->add_data; |
aef9ec39 | 1440 | |
85507bcc | 1441 | buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); |
9af76271 | 1442 | buf->key = cpu_to_be32(target->rkey); |
85507bcc | 1443 | buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); |
8f26c9ff | 1444 | |
52ede08f | 1445 | req->nmdesc = 0; |
8f26c9ff DD |
1446 | goto map_complete; |
1447 | } | |
1448 | ||
5cfb1782 BVA |
1449 | /* |
1450 | * We have more than one scatter/gather entry, so build our indirect | |
1451 | * descriptor table, trying to merge as many entries as we can. | |
8f26c9ff DD |
1452 | */ |
1453 | indirect_hdr = (void *) cmd->add_data; | |
1454 | ||
c07d424d DD |
1455 | ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr, |
1456 | target->indirect_size, DMA_TO_DEVICE); | |
1457 | ||
8f26c9ff | 1458 | memset(&state, 0, sizeof(state)); |
5cfb1782 | 1459 | srp_map_sg(&state, target, req, scat, count); |
cf368713 | 1460 | |
c07d424d DD |
1461 | /* We've mapped the request, now pull as much of the indirect |
1462 | * descriptor table as we can into the command buffer. If this | |
1463 | * target is not using an external indirect table, we are | |
1464 | * guaranteed to fit into the command, as the SCSI layer won't | |
1465 | * give us more S/G entries than we allow. | |
8f26c9ff | 1466 | */ |
8f26c9ff | 1467 | if (state.ndesc == 1) { |
5cfb1782 BVA |
1468 | /* |
1469 | * Memory registration collapsed the sg-list into one entry, | |
8f26c9ff DD |
1470 | * so use a direct descriptor. |
1471 | */ | |
1472 | struct srp_direct_buf *buf = (void *) cmd->add_data; | |
cf368713 | 1473 | |
c07d424d | 1474 | *buf = req->indirect_desc[0]; |
8f26c9ff | 1475 | goto map_complete; |
aef9ec39 RD |
1476 | } |
1477 | ||
c07d424d DD |
1478 | if (unlikely(target->cmd_sg_cnt < state.ndesc && |
1479 | !target->allow_ext_sg)) { | |
1480 | shost_printk(KERN_ERR, target->scsi_host, | |
1481 | "Could not fit S/G list into SRP_CMD\n"); | |
1482 | return -EIO; | |
1483 | } | |
1484 | ||
1485 | count = min(state.ndesc, target->cmd_sg_cnt); | |
8f26c9ff DD |
1486 | table_len = state.ndesc * sizeof (struct srp_direct_buf); |
1487 | ||
1488 | fmt = SRP_DATA_DESC_INDIRECT; | |
1489 | len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf); | |
c07d424d | 1490 | len += count * sizeof (struct srp_direct_buf); |
8f26c9ff | 1491 | |
c07d424d DD |
1492 | memcpy(indirect_hdr->desc_list, req->indirect_desc, |
1493 | count * sizeof (struct srp_direct_buf)); | |
8f26c9ff | 1494 | |
c07d424d | 1495 | indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr); |
8f26c9ff DD |
1496 | indirect_hdr->table_desc.key = cpu_to_be32(target->rkey); |
1497 | indirect_hdr->table_desc.len = cpu_to_be32(table_len); | |
1498 | indirect_hdr->len = cpu_to_be32(state.total_len); | |
1499 | ||
1500 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) | |
c07d424d | 1501 | cmd->data_out_desc_cnt = count; |
8f26c9ff | 1502 | else |
c07d424d DD |
1503 | cmd->data_in_desc_cnt = count; |
1504 | ||
1505 | ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len, | |
1506 | DMA_TO_DEVICE); | |
8f26c9ff DD |
1507 | |
1508 | map_complete: | |
aef9ec39 RD |
1509 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) |
1510 | cmd->buf_fmt = fmt << 4; | |
1511 | else | |
1512 | cmd->buf_fmt = fmt; | |
1513 | ||
aef9ec39 RD |
1514 | return len; |
1515 | } | |
1516 | ||
76c75b25 BVA |
1517 | /* |
1518 | * Return an IU and possible credit to the free pool | |
1519 | */ | |
1520 | static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu, | |
1521 | enum srp_iu_type iu_type) | |
1522 | { | |
1523 | unsigned long flags; | |
1524 | ||
e9684678 | 1525 | spin_lock_irqsave(&target->lock, flags); |
76c75b25 BVA |
1526 | list_add(&iu->list, &target->free_tx); |
1527 | if (iu_type != SRP_IU_RSP) | |
1528 | ++target->req_lim; | |
e9684678 | 1529 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 BVA |
1530 | } |
1531 | ||
05a1d750 | 1532 | /* |
e9684678 BVA |
1533 | * Must be called with target->lock held to protect req_lim and free_tx. |
1534 | * If IU is not sent, it must be returned using srp_put_tx_iu(). | |
05a1d750 DD |
1535 | * |
1536 | * Note: | |
1537 | * An upper limit for the number of allocated information units for each | |
1538 | * request type is: | |
1539 | * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues | |
1540 | * more than Scsi_Host.can_queue requests. | |
1541 | * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE. | |
1542 | * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than | |
1543 | * one unanswered SRP request to an initiator. | |
1544 | */ | |
1545 | static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target, | |
1546 | enum srp_iu_type iu_type) | |
1547 | { | |
1548 | s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE; | |
1549 | struct srp_iu *iu; | |
1550 | ||
1551 | srp_send_completion(target->send_cq, target); | |
1552 | ||
dcb4cb85 | 1553 | if (list_empty(&target->free_tx)) |
05a1d750 DD |
1554 | return NULL; |
1555 | ||
1556 | /* Initiator responses to target requests do not consume credits */ | |
76c75b25 BVA |
1557 | if (iu_type != SRP_IU_RSP) { |
1558 | if (target->req_lim <= rsv) { | |
1559 | ++target->zero_req_lim; | |
1560 | return NULL; | |
1561 | } | |
1562 | ||
1563 | --target->req_lim; | |
05a1d750 DD |
1564 | } |
1565 | ||
dcb4cb85 | 1566 | iu = list_first_entry(&target->free_tx, struct srp_iu, list); |
76c75b25 | 1567 | list_del(&iu->list); |
05a1d750 DD |
1568 | return iu; |
1569 | } | |
1570 | ||
76c75b25 BVA |
1571 | static int srp_post_send(struct srp_target_port *target, |
1572 | struct srp_iu *iu, int len) | |
05a1d750 DD |
1573 | { |
1574 | struct ib_sge list; | |
1575 | struct ib_send_wr wr, *bad_wr; | |
05a1d750 DD |
1576 | |
1577 | list.addr = iu->dma; | |
1578 | list.length = len; | |
9af76271 | 1579 | list.lkey = target->lkey; |
05a1d750 DD |
1580 | |
1581 | wr.next = NULL; | |
dcb4cb85 | 1582 | wr.wr_id = (uintptr_t) iu; |
05a1d750 DD |
1583 | wr.sg_list = &list; |
1584 | wr.num_sge = 1; | |
1585 | wr.opcode = IB_WR_SEND; | |
1586 | wr.send_flags = IB_SEND_SIGNALED; | |
1587 | ||
76c75b25 | 1588 | return ib_post_send(target->qp, &wr, &bad_wr); |
05a1d750 DD |
1589 | } |
1590 | ||
dcb4cb85 | 1591 | static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu) |
c996bb47 | 1592 | { |
c996bb47 | 1593 | struct ib_recv_wr wr, *bad_wr; |
dcb4cb85 | 1594 | struct ib_sge list; |
c996bb47 BVA |
1595 | |
1596 | list.addr = iu->dma; | |
1597 | list.length = iu->size; | |
9af76271 | 1598 | list.lkey = target->lkey; |
c996bb47 BVA |
1599 | |
1600 | wr.next = NULL; | |
dcb4cb85 | 1601 | wr.wr_id = (uintptr_t) iu; |
c996bb47 BVA |
1602 | wr.sg_list = &list; |
1603 | wr.num_sge = 1; | |
1604 | ||
dcb4cb85 | 1605 | return ib_post_recv(target->qp, &wr, &bad_wr); |
c996bb47 BVA |
1606 | } |
1607 | ||
aef9ec39 RD |
1608 | static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) |
1609 | { | |
1610 | struct srp_request *req; | |
1611 | struct scsi_cmnd *scmnd; | |
1612 | unsigned long flags; | |
aef9ec39 | 1613 | |
aef9ec39 | 1614 | if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { |
e9684678 | 1615 | spin_lock_irqsave(&target->lock, flags); |
94a9174c | 1616 | target->req_lim += be32_to_cpu(rsp->req_lim_delta); |
e9684678 | 1617 | spin_unlock_irqrestore(&target->lock, flags); |
94a9174c | 1618 | |
f8b6e31e DD |
1619 | target->tsk_mgmt_status = -1; |
1620 | if (be32_to_cpu(rsp->resp_data_len) >= 4) | |
1621 | target->tsk_mgmt_status = rsp->data[3]; | |
1622 | complete(&target->tsk_mgmt_done); | |
aef9ec39 | 1623 | } else { |
f8b6e31e | 1624 | req = &target->req_ring[rsp->tag]; |
b3fe628d | 1625 | scmnd = srp_claim_req(target, req, NULL, NULL); |
22032991 | 1626 | if (!scmnd) { |
7aa54bd7 DD |
1627 | shost_printk(KERN_ERR, target->scsi_host, |
1628 | "Null scmnd for RSP w/tag %016llx\n", | |
1629 | (unsigned long long) rsp->tag); | |
22032991 BVA |
1630 | |
1631 | spin_lock_irqsave(&target->lock, flags); | |
1632 | target->req_lim += be32_to_cpu(rsp->req_lim_delta); | |
1633 | spin_unlock_irqrestore(&target->lock, flags); | |
1634 | ||
1635 | return; | |
1636 | } | |
aef9ec39 RD |
1637 | scmnd->result = rsp->status; |
1638 | ||
1639 | if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { | |
1640 | memcpy(scmnd->sense_buffer, rsp->data + | |
1641 | be32_to_cpu(rsp->resp_data_len), | |
1642 | min_t(int, be32_to_cpu(rsp->sense_data_len), | |
1643 | SCSI_SENSE_BUFFERSIZE)); | |
1644 | } | |
1645 | ||
1646 | if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) | |
bb350d1d | 1647 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); |
aef9ec39 | 1648 | else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) |
bb350d1d | 1649 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
aef9ec39 | 1650 | |
22032991 BVA |
1651 | srp_free_req(target, req, scmnd, |
1652 | be32_to_cpu(rsp->req_lim_delta)); | |
1653 | ||
f8b6e31e DD |
1654 | scmnd->host_scribble = NULL; |
1655 | scmnd->scsi_done(scmnd); | |
aef9ec39 | 1656 | } |
aef9ec39 RD |
1657 | } |
1658 | ||
bb12588a DD |
1659 | static int srp_response_common(struct srp_target_port *target, s32 req_delta, |
1660 | void *rsp, int len) | |
1661 | { | |
76c75b25 | 1662 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
bb12588a DD |
1663 | unsigned long flags; |
1664 | struct srp_iu *iu; | |
76c75b25 | 1665 | int err; |
bb12588a | 1666 | |
e9684678 | 1667 | spin_lock_irqsave(&target->lock, flags); |
bb12588a | 1668 | target->req_lim += req_delta; |
bb12588a | 1669 | iu = __srp_get_tx_iu(target, SRP_IU_RSP); |
e9684678 | 1670 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 | 1671 | |
bb12588a DD |
1672 | if (!iu) { |
1673 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1674 | "no IU available to send response\n"); | |
76c75b25 | 1675 | return 1; |
bb12588a DD |
1676 | } |
1677 | ||
1678 | ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE); | |
1679 | memcpy(iu->buf, rsp, len); | |
1680 | ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE); | |
1681 | ||
76c75b25 BVA |
1682 | err = srp_post_send(target, iu, len); |
1683 | if (err) { | |
bb12588a DD |
1684 | shost_printk(KERN_ERR, target->scsi_host, PFX |
1685 | "unable to post response: %d\n", err); | |
76c75b25 BVA |
1686 | srp_put_tx_iu(target, iu, SRP_IU_RSP); |
1687 | } | |
bb12588a | 1688 | |
bb12588a DD |
1689 | return err; |
1690 | } | |
1691 | ||
1692 | static void srp_process_cred_req(struct srp_target_port *target, | |
1693 | struct srp_cred_req *req) | |
1694 | { | |
1695 | struct srp_cred_rsp rsp = { | |
1696 | .opcode = SRP_CRED_RSP, | |
1697 | .tag = req->tag, | |
1698 | }; | |
1699 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
1700 | ||
1701 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1702 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1703 | "problems processing SRP_CRED_REQ\n"); | |
1704 | } | |
1705 | ||
1706 | static void srp_process_aer_req(struct srp_target_port *target, | |
1707 | struct srp_aer_req *req) | |
1708 | { | |
1709 | struct srp_aer_rsp rsp = { | |
1710 | .opcode = SRP_AER_RSP, | |
1711 | .tag = req->tag, | |
1712 | }; | |
1713 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
1714 | ||
1715 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1716 | "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun)); | |
1717 | ||
1718 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1719 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1720 | "problems processing SRP_AER_REQ\n"); | |
1721 | } | |
1722 | ||
aef9ec39 RD |
1723 | static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) |
1724 | { | |
dcb4cb85 | 1725 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
737b94eb | 1726 | struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id; |
c996bb47 | 1727 | int res; |
aef9ec39 RD |
1728 | u8 opcode; |
1729 | ||
85507bcc RC |
1730 | ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, |
1731 | DMA_FROM_DEVICE); | |
aef9ec39 RD |
1732 | |
1733 | opcode = *(u8 *) iu->buf; | |
1734 | ||
1735 | if (0) { | |
7aa54bd7 DD |
1736 | shost_printk(KERN_ERR, target->scsi_host, |
1737 | PFX "recv completion, opcode 0x%02x\n", opcode); | |
7a700811 BVA |
1738 | print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1, |
1739 | iu->buf, wc->byte_len, true); | |
aef9ec39 RD |
1740 | } |
1741 | ||
1742 | switch (opcode) { | |
1743 | case SRP_RSP: | |
1744 | srp_process_rsp(target, iu->buf); | |
1745 | break; | |
1746 | ||
bb12588a DD |
1747 | case SRP_CRED_REQ: |
1748 | srp_process_cred_req(target, iu->buf); | |
1749 | break; | |
1750 | ||
1751 | case SRP_AER_REQ: | |
1752 | srp_process_aer_req(target, iu->buf); | |
1753 | break; | |
1754 | ||
aef9ec39 RD |
1755 | case SRP_T_LOGOUT: |
1756 | /* XXX Handle target logout */ | |
7aa54bd7 DD |
1757 | shost_printk(KERN_WARNING, target->scsi_host, |
1758 | PFX "Got target logout request\n"); | |
aef9ec39 RD |
1759 | break; |
1760 | ||
1761 | default: | |
7aa54bd7 DD |
1762 | shost_printk(KERN_WARNING, target->scsi_host, |
1763 | PFX "Unhandled SRP opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1764 | break; |
1765 | } | |
1766 | ||
85507bcc RC |
1767 | ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, |
1768 | DMA_FROM_DEVICE); | |
c996bb47 | 1769 | |
dcb4cb85 | 1770 | res = srp_post_recv(target, iu); |
c996bb47 BVA |
1771 | if (res != 0) |
1772 | shost_printk(KERN_ERR, target->scsi_host, | |
1773 | PFX "Recv failed with error code %d\n", res); | |
aef9ec39 RD |
1774 | } |
1775 | ||
c1120f89 BVA |
1776 | /** |
1777 | * srp_tl_err_work() - handle a transport layer error | |
af24663b | 1778 | * @work: Work structure embedded in an SRP target port. |
c1120f89 BVA |
1779 | * |
1780 | * Note: This function may get invoked before the rport has been created, | |
1781 | * hence the target->rport test. | |
1782 | */ | |
1783 | static void srp_tl_err_work(struct work_struct *work) | |
1784 | { | |
1785 | struct srp_target_port *target; | |
1786 | ||
1787 | target = container_of(work, struct srp_target_port, tl_err_work); | |
1788 | if (target->rport) | |
1789 | srp_start_tl_fail_timers(target->rport); | |
1790 | } | |
1791 | ||
5cfb1782 BVA |
1792 | static void srp_handle_qp_err(u64 wr_id, enum ib_wc_status wc_status, |
1793 | bool send_err, struct srp_target_port *target) | |
948d1e88 | 1794 | { |
294c875a | 1795 | if (target->connected && !target->qp_in_error) { |
5cfb1782 BVA |
1796 | if (wr_id & LOCAL_INV_WR_ID_MASK) { |
1797 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1798 | "LOCAL_INV failed with status %d\n", | |
1799 | wc_status); | |
1800 | } else if (wr_id & FAST_REG_WR_ID_MASK) { | |
1801 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1802 | "FAST_REG_MR failed status %d\n", | |
1803 | wc_status); | |
1804 | } else { | |
1805 | shost_printk(KERN_ERR, target->scsi_host, | |
1806 | PFX "failed %s status %d for iu %p\n", | |
1807 | send_err ? "send" : "receive", | |
1808 | wc_status, (void *)(uintptr_t)wr_id); | |
1809 | } | |
c1120f89 | 1810 | queue_work(system_long_wq, &target->tl_err_work); |
4f0af697 | 1811 | } |
948d1e88 BVA |
1812 | target->qp_in_error = true; |
1813 | } | |
1814 | ||
9c03dc9f | 1815 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr) |
aef9ec39 RD |
1816 | { |
1817 | struct srp_target_port *target = target_ptr; | |
1818 | struct ib_wc wc; | |
aef9ec39 RD |
1819 | |
1820 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
1821 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
948d1e88 BVA |
1822 | if (likely(wc.status == IB_WC_SUCCESS)) { |
1823 | srp_handle_recv(target, &wc); | |
1824 | } else { | |
5cfb1782 | 1825 | srp_handle_qp_err(wc.wr_id, wc.status, false, target); |
aef9ec39 | 1826 | } |
9c03dc9f BVA |
1827 | } |
1828 | } | |
1829 | ||
1830 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr) | |
1831 | { | |
1832 | struct srp_target_port *target = target_ptr; | |
1833 | struct ib_wc wc; | |
dcb4cb85 | 1834 | struct srp_iu *iu; |
9c03dc9f BVA |
1835 | |
1836 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
948d1e88 BVA |
1837 | if (likely(wc.status == IB_WC_SUCCESS)) { |
1838 | iu = (struct srp_iu *) (uintptr_t) wc.wr_id; | |
1839 | list_add(&iu->list, &target->free_tx); | |
1840 | } else { | |
5cfb1782 | 1841 | srp_handle_qp_err(wc.wr_id, wc.status, true, target); |
9c03dc9f | 1842 | } |
aef9ec39 RD |
1843 | } |
1844 | } | |
1845 | ||
76c75b25 | 1846 | static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd) |
aef9ec39 | 1847 | { |
76c75b25 | 1848 | struct srp_target_port *target = host_to_target(shost); |
a95cadb9 | 1849 | struct srp_rport *rport = target->rport; |
aef9ec39 RD |
1850 | struct srp_request *req; |
1851 | struct srp_iu *iu; | |
1852 | struct srp_cmd *cmd; | |
85507bcc | 1853 | struct ib_device *dev; |
76c75b25 | 1854 | unsigned long flags; |
d1b4289e | 1855 | int len, ret; |
a95cadb9 BVA |
1856 | const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler; |
1857 | ||
1858 | /* | |
1859 | * The SCSI EH thread is the only context from which srp_queuecommand() | |
1860 | * can get invoked for blocked devices (SDEV_BLOCK / | |
1861 | * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by | |
1862 | * locking the rport mutex if invoked from inside the SCSI EH. | |
1863 | */ | |
1864 | if (in_scsi_eh) | |
1865 | mutex_lock(&rport->mutex); | |
aef9ec39 | 1866 | |
d1b4289e BVA |
1867 | scmnd->result = srp_chkready(target->rport); |
1868 | if (unlikely(scmnd->result)) | |
1869 | goto err; | |
2ce19e72 | 1870 | |
e9684678 | 1871 | spin_lock_irqsave(&target->lock, flags); |
bb12588a | 1872 | iu = __srp_get_tx_iu(target, SRP_IU_CMD); |
aef9ec39 | 1873 | if (!iu) |
695b8349 BVA |
1874 | goto err_unlock; |
1875 | ||
1876 | req = list_first_entry(&target->free_reqs, struct srp_request, list); | |
1877 | list_del(&req->list); | |
1878 | spin_unlock_irqrestore(&target->lock, flags); | |
aef9ec39 | 1879 | |
05321937 | 1880 | dev = target->srp_host->srp_dev->dev; |
49248644 | 1881 | ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len, |
85507bcc | 1882 | DMA_TO_DEVICE); |
aef9ec39 | 1883 | |
f8b6e31e | 1884 | scmnd->host_scribble = (void *) req; |
aef9ec39 RD |
1885 | |
1886 | cmd = iu->buf; | |
1887 | memset(cmd, 0, sizeof *cmd); | |
1888 | ||
1889 | cmd->opcode = SRP_CMD; | |
1890 | cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); | |
d945e1df | 1891 | cmd->tag = req->index; |
aef9ec39 RD |
1892 | memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); |
1893 | ||
aef9ec39 RD |
1894 | req->scmnd = scmnd; |
1895 | req->cmd = iu; | |
aef9ec39 RD |
1896 | |
1897 | len = srp_map_data(scmnd, target, req); | |
1898 | if (len < 0) { | |
7aa54bd7 | 1899 | shost_printk(KERN_ERR, target->scsi_host, |
d1b4289e BVA |
1900 | PFX "Failed to map data (%d)\n", len); |
1901 | /* | |
1902 | * If we ran out of memory descriptors (-ENOMEM) because an | |
1903 | * application is queuing many requests with more than | |
52ede08f | 1904 | * max_pages_per_mr sg-list elements, tell the SCSI mid-layer |
d1b4289e BVA |
1905 | * to reduce queue depth temporarily. |
1906 | */ | |
1907 | scmnd->result = len == -ENOMEM ? | |
1908 | DID_OK << 16 | QUEUE_FULL << 1 : DID_ERROR << 16; | |
76c75b25 | 1909 | goto err_iu; |
aef9ec39 RD |
1910 | } |
1911 | ||
49248644 | 1912 | ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len, |
85507bcc | 1913 | DMA_TO_DEVICE); |
aef9ec39 | 1914 | |
76c75b25 | 1915 | if (srp_post_send(target, iu, len)) { |
7aa54bd7 | 1916 | shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n"); |
aef9ec39 RD |
1917 | goto err_unmap; |
1918 | } | |
1919 | ||
d1b4289e BVA |
1920 | ret = 0; |
1921 | ||
a95cadb9 BVA |
1922 | unlock_rport: |
1923 | if (in_scsi_eh) | |
1924 | mutex_unlock(&rport->mutex); | |
1925 | ||
d1b4289e | 1926 | return ret; |
aef9ec39 RD |
1927 | |
1928 | err_unmap: | |
1929 | srp_unmap_data(scmnd, target, req); | |
1930 | ||
76c75b25 BVA |
1931 | err_iu: |
1932 | srp_put_tx_iu(target, iu, SRP_IU_CMD); | |
1933 | ||
024ca901 BVA |
1934 | /* |
1935 | * Avoid that the loops that iterate over the request ring can | |
1936 | * encounter a dangling SCSI command pointer. | |
1937 | */ | |
1938 | req->scmnd = NULL; | |
1939 | ||
e9684678 | 1940 | spin_lock_irqsave(&target->lock, flags); |
76c75b25 | 1941 | list_add(&req->list, &target->free_reqs); |
695b8349 BVA |
1942 | |
1943 | err_unlock: | |
e9684678 | 1944 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 | 1945 | |
d1b4289e BVA |
1946 | err: |
1947 | if (scmnd->result) { | |
1948 | scmnd->scsi_done(scmnd); | |
1949 | ret = 0; | |
1950 | } else { | |
1951 | ret = SCSI_MLQUEUE_HOST_BUSY; | |
1952 | } | |
a95cadb9 | 1953 | |
d1b4289e | 1954 | goto unlock_rport; |
aef9ec39 RD |
1955 | } |
1956 | ||
4d73f95f BVA |
1957 | /* |
1958 | * Note: the resources allocated in this function are freed in | |
1959 | * srp_free_target_ib(). | |
1960 | */ | |
aef9ec39 RD |
1961 | static int srp_alloc_iu_bufs(struct srp_target_port *target) |
1962 | { | |
1963 | int i; | |
1964 | ||
4d73f95f BVA |
1965 | target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring), |
1966 | GFP_KERNEL); | |
1967 | if (!target->rx_ring) | |
1968 | goto err_no_ring; | |
1969 | target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring), | |
1970 | GFP_KERNEL); | |
1971 | if (!target->tx_ring) | |
1972 | goto err_no_ring; | |
1973 | ||
1974 | for (i = 0; i < target->queue_size; ++i) { | |
aef9ec39 RD |
1975 | target->rx_ring[i] = srp_alloc_iu(target->srp_host, |
1976 | target->max_ti_iu_len, | |
1977 | GFP_KERNEL, DMA_FROM_DEVICE); | |
1978 | if (!target->rx_ring[i]) | |
1979 | goto err; | |
1980 | } | |
1981 | ||
4d73f95f | 1982 | for (i = 0; i < target->queue_size; ++i) { |
aef9ec39 | 1983 | target->tx_ring[i] = srp_alloc_iu(target->srp_host, |
49248644 | 1984 | target->max_iu_len, |
aef9ec39 RD |
1985 | GFP_KERNEL, DMA_TO_DEVICE); |
1986 | if (!target->tx_ring[i]) | |
1987 | goto err; | |
dcb4cb85 BVA |
1988 | |
1989 | list_add(&target->tx_ring[i]->list, &target->free_tx); | |
aef9ec39 RD |
1990 | } |
1991 | ||
1992 | return 0; | |
1993 | ||
1994 | err: | |
4d73f95f | 1995 | for (i = 0; i < target->queue_size; ++i) { |
aef9ec39 | 1996 | srp_free_iu(target->srp_host, target->rx_ring[i]); |
aef9ec39 | 1997 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
aef9ec39 RD |
1998 | } |
1999 | ||
4d73f95f BVA |
2000 | |
2001 | err_no_ring: | |
2002 | kfree(target->tx_ring); | |
2003 | target->tx_ring = NULL; | |
2004 | kfree(target->rx_ring); | |
2005 | target->rx_ring = NULL; | |
2006 | ||
aef9ec39 RD |
2007 | return -ENOMEM; |
2008 | } | |
2009 | ||
c9b03c1a BVA |
2010 | static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask) |
2011 | { | |
2012 | uint64_t T_tr_ns, max_compl_time_ms; | |
2013 | uint32_t rq_tmo_jiffies; | |
2014 | ||
2015 | /* | |
2016 | * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair, | |
2017 | * table 91), both the QP timeout and the retry count have to be set | |
2018 | * for RC QP's during the RTR to RTS transition. | |
2019 | */ | |
2020 | WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) != | |
2021 | (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)); | |
2022 | ||
2023 | /* | |
2024 | * Set target->rq_tmo_jiffies to one second more than the largest time | |
2025 | * it can take before an error completion is generated. See also | |
2026 | * C9-140..142 in the IBTA spec for more information about how to | |
2027 | * convert the QP Local ACK Timeout value to nanoseconds. | |
2028 | */ | |
2029 | T_tr_ns = 4096 * (1ULL << qp_attr->timeout); | |
2030 | max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns; | |
2031 | do_div(max_compl_time_ms, NSEC_PER_MSEC); | |
2032 | rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000); | |
2033 | ||
2034 | return rq_tmo_jiffies; | |
2035 | } | |
2036 | ||
961e0be8 DD |
2037 | static void srp_cm_rep_handler(struct ib_cm_id *cm_id, |
2038 | struct srp_login_rsp *lrsp, | |
2039 | struct srp_target_port *target) | |
2040 | { | |
2041 | struct ib_qp_attr *qp_attr = NULL; | |
2042 | int attr_mask = 0; | |
2043 | int ret; | |
2044 | int i; | |
2045 | ||
2046 | if (lrsp->opcode == SRP_LOGIN_RSP) { | |
2047 | target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len); | |
2048 | target->req_lim = be32_to_cpu(lrsp->req_lim_delta); | |
2049 | ||
2050 | /* | |
2051 | * Reserve credits for task management so we don't | |
2052 | * bounce requests back to the SCSI mid-layer. | |
2053 | */ | |
2054 | target->scsi_host->can_queue | |
2055 | = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE, | |
2056 | target->scsi_host->can_queue); | |
4d73f95f BVA |
2057 | target->scsi_host->cmd_per_lun |
2058 | = min_t(int, target->scsi_host->can_queue, | |
2059 | target->scsi_host->cmd_per_lun); | |
961e0be8 DD |
2060 | } else { |
2061 | shost_printk(KERN_WARNING, target->scsi_host, | |
2062 | PFX "Unhandled RSP opcode %#x\n", lrsp->opcode); | |
2063 | ret = -ECONNRESET; | |
2064 | goto error; | |
2065 | } | |
2066 | ||
4d73f95f | 2067 | if (!target->rx_ring) { |
961e0be8 DD |
2068 | ret = srp_alloc_iu_bufs(target); |
2069 | if (ret) | |
2070 | goto error; | |
2071 | } | |
2072 | ||
2073 | ret = -ENOMEM; | |
2074 | qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); | |
2075 | if (!qp_attr) | |
2076 | goto error; | |
2077 | ||
2078 | qp_attr->qp_state = IB_QPS_RTR; | |
2079 | ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
2080 | if (ret) | |
2081 | goto error_free; | |
2082 | ||
2083 | ret = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
2084 | if (ret) | |
2085 | goto error_free; | |
2086 | ||
4d73f95f | 2087 | for (i = 0; i < target->queue_size; i++) { |
961e0be8 DD |
2088 | struct srp_iu *iu = target->rx_ring[i]; |
2089 | ret = srp_post_recv(target, iu); | |
2090 | if (ret) | |
2091 | goto error_free; | |
2092 | } | |
2093 | ||
2094 | qp_attr->qp_state = IB_QPS_RTS; | |
2095 | ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
2096 | if (ret) | |
2097 | goto error_free; | |
2098 | ||
c9b03c1a BVA |
2099 | target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask); |
2100 | ||
961e0be8 DD |
2101 | ret = ib_modify_qp(target->qp, qp_attr, attr_mask); |
2102 | if (ret) | |
2103 | goto error_free; | |
2104 | ||
2105 | ret = ib_send_cm_rtu(cm_id, NULL, 0); | |
2106 | ||
2107 | error_free: | |
2108 | kfree(qp_attr); | |
2109 | ||
2110 | error: | |
2111 | target->status = ret; | |
2112 | } | |
2113 | ||
aef9ec39 RD |
2114 | static void srp_cm_rej_handler(struct ib_cm_id *cm_id, |
2115 | struct ib_cm_event *event, | |
2116 | struct srp_target_port *target) | |
2117 | { | |
7aa54bd7 | 2118 | struct Scsi_Host *shost = target->scsi_host; |
aef9ec39 RD |
2119 | struct ib_class_port_info *cpi; |
2120 | int opcode; | |
2121 | ||
2122 | switch (event->param.rej_rcvd.reason) { | |
2123 | case IB_CM_REJ_PORT_CM_REDIRECT: | |
2124 | cpi = event->param.rej_rcvd.ari; | |
2125 | target->path.dlid = cpi->redirect_lid; | |
2126 | target->path.pkey = cpi->redirect_pkey; | |
2127 | cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; | |
2128 | memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); | |
2129 | ||
2130 | target->status = target->path.dlid ? | |
2131 | SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; | |
2132 | break; | |
2133 | ||
2134 | case IB_CM_REJ_PORT_REDIRECT: | |
5d7cbfd6 | 2135 | if (srp_target_is_topspin(target)) { |
aef9ec39 RD |
2136 | /* |
2137 | * Topspin/Cisco SRP gateways incorrectly send | |
2138 | * reject reason code 25 when they mean 24 | |
2139 | * (port redirect). | |
2140 | */ | |
2141 | memcpy(target->path.dgid.raw, | |
2142 | event->param.rej_rcvd.ari, 16); | |
2143 | ||
7aa54bd7 DD |
2144 | shost_printk(KERN_DEBUG, shost, |
2145 | PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", | |
2146 | (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), | |
2147 | (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); | |
aef9ec39 RD |
2148 | |
2149 | target->status = SRP_PORT_REDIRECT; | |
2150 | } else { | |
7aa54bd7 DD |
2151 | shost_printk(KERN_WARNING, shost, |
2152 | " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); | |
aef9ec39 RD |
2153 | target->status = -ECONNRESET; |
2154 | } | |
2155 | break; | |
2156 | ||
2157 | case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: | |
7aa54bd7 DD |
2158 | shost_printk(KERN_WARNING, shost, |
2159 | " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); | |
aef9ec39 RD |
2160 | target->status = -ECONNRESET; |
2161 | break; | |
2162 | ||
2163 | case IB_CM_REJ_CONSUMER_DEFINED: | |
2164 | opcode = *(u8 *) event->private_data; | |
2165 | if (opcode == SRP_LOGIN_REJ) { | |
2166 | struct srp_login_rej *rej = event->private_data; | |
2167 | u32 reason = be32_to_cpu(rej->reason); | |
2168 | ||
2169 | if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) | |
7aa54bd7 DD |
2170 | shost_printk(KERN_WARNING, shost, |
2171 | PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); | |
aef9ec39 | 2172 | else |
e7ffde01 BVA |
2173 | shost_printk(KERN_WARNING, shost, PFX |
2174 | "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n", | |
2175 | target->path.sgid.raw, | |
2176 | target->orig_dgid, reason); | |
aef9ec39 | 2177 | } else |
7aa54bd7 DD |
2178 | shost_printk(KERN_WARNING, shost, |
2179 | " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," | |
2180 | " opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
2181 | target->status = -ECONNRESET; |
2182 | break; | |
2183 | ||
9fe4bcf4 DD |
2184 | case IB_CM_REJ_STALE_CONN: |
2185 | shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n"); | |
2186 | target->status = SRP_STALE_CONN; | |
2187 | break; | |
2188 | ||
aef9ec39 | 2189 | default: |
7aa54bd7 DD |
2190 | shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n", |
2191 | event->param.rej_rcvd.reason); | |
aef9ec39 RD |
2192 | target->status = -ECONNRESET; |
2193 | } | |
2194 | } | |
2195 | ||
2196 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
2197 | { | |
2198 | struct srp_target_port *target = cm_id->context; | |
aef9ec39 | 2199 | int comp = 0; |
aef9ec39 RD |
2200 | |
2201 | switch (event->event) { | |
2202 | case IB_CM_REQ_ERROR: | |
7aa54bd7 DD |
2203 | shost_printk(KERN_DEBUG, target->scsi_host, |
2204 | PFX "Sending CM REQ failed\n"); | |
aef9ec39 RD |
2205 | comp = 1; |
2206 | target->status = -ECONNRESET; | |
2207 | break; | |
2208 | ||
2209 | case IB_CM_REP_RECEIVED: | |
2210 | comp = 1; | |
961e0be8 | 2211 | srp_cm_rep_handler(cm_id, event->private_data, target); |
aef9ec39 RD |
2212 | break; |
2213 | ||
2214 | case IB_CM_REJ_RECEIVED: | |
7aa54bd7 | 2215 | shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n"); |
aef9ec39 RD |
2216 | comp = 1; |
2217 | ||
2218 | srp_cm_rej_handler(cm_id, event, target); | |
2219 | break; | |
2220 | ||
b7ac4ab4 | 2221 | case IB_CM_DREQ_RECEIVED: |
7aa54bd7 DD |
2222 | shost_printk(KERN_WARNING, target->scsi_host, |
2223 | PFX "DREQ received - connection closed\n"); | |
294c875a | 2224 | srp_change_conn_state(target, false); |
b7ac4ab4 | 2225 | if (ib_send_cm_drep(cm_id, NULL, 0)) |
7aa54bd7 DD |
2226 | shost_printk(KERN_ERR, target->scsi_host, |
2227 | PFX "Sending CM DREP failed\n"); | |
c1120f89 | 2228 | queue_work(system_long_wq, &target->tl_err_work); |
aef9ec39 RD |
2229 | break; |
2230 | ||
2231 | case IB_CM_TIMEWAIT_EXIT: | |
7aa54bd7 DD |
2232 | shost_printk(KERN_ERR, target->scsi_host, |
2233 | PFX "connection closed\n"); | |
ac72d766 | 2234 | comp = 1; |
aef9ec39 | 2235 | |
aef9ec39 RD |
2236 | target->status = 0; |
2237 | break; | |
2238 | ||
b7ac4ab4 IR |
2239 | case IB_CM_MRA_RECEIVED: |
2240 | case IB_CM_DREQ_ERROR: | |
2241 | case IB_CM_DREP_RECEIVED: | |
2242 | break; | |
2243 | ||
aef9ec39 | 2244 | default: |
7aa54bd7 DD |
2245 | shost_printk(KERN_WARNING, target->scsi_host, |
2246 | PFX "Unhandled CM event %d\n", event->event); | |
aef9ec39 RD |
2247 | break; |
2248 | } | |
2249 | ||
2250 | if (comp) | |
2251 | complete(&target->done); | |
2252 | ||
aef9ec39 RD |
2253 | return 0; |
2254 | } | |
2255 | ||
71444b97 JW |
2256 | /** |
2257 | * srp_change_queue_type - changing device queue tag type | |
2258 | * @sdev: scsi device struct | |
2259 | * @tag_type: requested tag type | |
2260 | * | |
2261 | * Returns queue tag type. | |
2262 | */ | |
2263 | static int | |
2264 | srp_change_queue_type(struct scsi_device *sdev, int tag_type) | |
2265 | { | |
2266 | if (sdev->tagged_supported) { | |
2267 | scsi_set_tag_type(sdev, tag_type); | |
2268 | if (tag_type) | |
2269 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2270 | else | |
2271 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2272 | } else | |
2273 | tag_type = 0; | |
2274 | ||
2275 | return tag_type; | |
2276 | } | |
2277 | ||
2278 | /** | |
2279 | * srp_change_queue_depth - setting device queue depth | |
2280 | * @sdev: scsi device struct | |
2281 | * @qdepth: requested queue depth | |
2282 | * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP | |
2283 | * (see include/scsi/scsi_host.h for definition) | |
2284 | * | |
2285 | * Returns queue depth. | |
2286 | */ | |
2287 | static int | |
2288 | srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) | |
2289 | { | |
2290 | struct Scsi_Host *shost = sdev->host; | |
2291 | int max_depth; | |
2292 | if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) { | |
2293 | max_depth = shost->can_queue; | |
2294 | if (!sdev->tagged_supported) | |
2295 | max_depth = 1; | |
2296 | if (qdepth > max_depth) | |
2297 | qdepth = max_depth; | |
2298 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2299 | } else if (reason == SCSI_QDEPTH_QFULL) | |
2300 | scsi_track_queue_full(sdev, qdepth); | |
2301 | else | |
2302 | return -EOPNOTSUPP; | |
2303 | ||
2304 | return sdev->queue_depth; | |
2305 | } | |
2306 | ||
d945e1df | 2307 | static int srp_send_tsk_mgmt(struct srp_target_port *target, |
f8b6e31e | 2308 | u64 req_tag, unsigned int lun, u8 func) |
aef9ec39 | 2309 | { |
a95cadb9 | 2310 | struct srp_rport *rport = target->rport; |
19081f31 | 2311 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
aef9ec39 RD |
2312 | struct srp_iu *iu; |
2313 | struct srp_tsk_mgmt *tsk_mgmt; | |
aef9ec39 | 2314 | |
3780d1f0 BVA |
2315 | if (!target->connected || target->qp_in_error) |
2316 | return -1; | |
2317 | ||
f8b6e31e | 2318 | init_completion(&target->tsk_mgmt_done); |
aef9ec39 | 2319 | |
a95cadb9 BVA |
2320 | /* |
2321 | * Lock the rport mutex to avoid that srp_create_target_ib() is | |
2322 | * invoked while a task management function is being sent. | |
2323 | */ | |
2324 | mutex_lock(&rport->mutex); | |
e9684678 | 2325 | spin_lock_irq(&target->lock); |
bb12588a | 2326 | iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT); |
e9684678 | 2327 | spin_unlock_irq(&target->lock); |
76c75b25 | 2328 | |
a95cadb9 BVA |
2329 | if (!iu) { |
2330 | mutex_unlock(&rport->mutex); | |
2331 | ||
76c75b25 | 2332 | return -1; |
a95cadb9 | 2333 | } |
aef9ec39 | 2334 | |
19081f31 DD |
2335 | ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt, |
2336 | DMA_TO_DEVICE); | |
aef9ec39 RD |
2337 | tsk_mgmt = iu->buf; |
2338 | memset(tsk_mgmt, 0, sizeof *tsk_mgmt); | |
2339 | ||
2340 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
f8b6e31e DD |
2341 | tsk_mgmt->lun = cpu_to_be64((u64) lun << 48); |
2342 | tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT; | |
aef9ec39 | 2343 | tsk_mgmt->tsk_mgmt_func = func; |
f8b6e31e | 2344 | tsk_mgmt->task_tag = req_tag; |
aef9ec39 | 2345 | |
19081f31 DD |
2346 | ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt, |
2347 | DMA_TO_DEVICE); | |
76c75b25 BVA |
2348 | if (srp_post_send(target, iu, sizeof *tsk_mgmt)) { |
2349 | srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT); | |
a95cadb9 BVA |
2350 | mutex_unlock(&rport->mutex); |
2351 | ||
76c75b25 BVA |
2352 | return -1; |
2353 | } | |
a95cadb9 | 2354 | mutex_unlock(&rport->mutex); |
d945e1df | 2355 | |
f8b6e31e | 2356 | if (!wait_for_completion_timeout(&target->tsk_mgmt_done, |
aef9ec39 | 2357 | msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) |
d945e1df | 2358 | return -1; |
aef9ec39 | 2359 | |
d945e1df | 2360 | return 0; |
d945e1df RD |
2361 | } |
2362 | ||
aef9ec39 RD |
2363 | static int srp_abort(struct scsi_cmnd *scmnd) |
2364 | { | |
d945e1df | 2365 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
f8b6e31e | 2366 | struct srp_request *req = (struct srp_request *) scmnd->host_scribble; |
086f44f5 | 2367 | int ret; |
d945e1df | 2368 | |
7aa54bd7 | 2369 | shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n"); |
aef9ec39 | 2370 | |
b3fe628d | 2371 | if (!req || !srp_claim_req(target, req, NULL, scmnd)) |
99b6697a | 2372 | return SUCCESS; |
086f44f5 | 2373 | if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun, |
80d5e8a2 | 2374 | SRP_TSK_ABORT_TASK) == 0) |
086f44f5 | 2375 | ret = SUCCESS; |
ed9b2264 | 2376 | else if (target->rport->state == SRP_RPORT_LOST) |
99e1c139 | 2377 | ret = FAST_IO_FAIL; |
086f44f5 BVA |
2378 | else |
2379 | ret = FAILED; | |
22032991 BVA |
2380 | srp_free_req(target, req, scmnd, 0); |
2381 | scmnd->result = DID_ABORT << 16; | |
d8536670 | 2382 | scmnd->scsi_done(scmnd); |
d945e1df | 2383 | |
086f44f5 | 2384 | return ret; |
aef9ec39 RD |
2385 | } |
2386 | ||
2387 | static int srp_reset_device(struct scsi_cmnd *scmnd) | |
2388 | { | |
d945e1df | 2389 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
536ae14e | 2390 | int i; |
d945e1df | 2391 | |
7aa54bd7 | 2392 | shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n"); |
aef9ec39 | 2393 | |
f8b6e31e DD |
2394 | if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun, |
2395 | SRP_TSK_LUN_RESET)) | |
d945e1df | 2396 | return FAILED; |
f8b6e31e | 2397 | if (target->tsk_mgmt_status) |
d945e1df RD |
2398 | return FAILED; |
2399 | ||
4d73f95f | 2400 | for (i = 0; i < target->req_ring_size; ++i) { |
536ae14e | 2401 | struct srp_request *req = &target->req_ring[i]; |
b3fe628d | 2402 | srp_finish_req(target, req, scmnd->device, DID_RESET << 16); |
536ae14e | 2403 | } |
d945e1df | 2404 | |
d945e1df | 2405 | return SUCCESS; |
aef9ec39 RD |
2406 | } |
2407 | ||
2408 | static int srp_reset_host(struct scsi_cmnd *scmnd) | |
2409 | { | |
2410 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
aef9ec39 | 2411 | |
7aa54bd7 | 2412 | shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n"); |
aef9ec39 | 2413 | |
ed9b2264 | 2414 | return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED; |
aef9ec39 RD |
2415 | } |
2416 | ||
c9b03c1a BVA |
2417 | static int srp_slave_configure(struct scsi_device *sdev) |
2418 | { | |
2419 | struct Scsi_Host *shost = sdev->host; | |
2420 | struct srp_target_port *target = host_to_target(shost); | |
2421 | struct request_queue *q = sdev->request_queue; | |
2422 | unsigned long timeout; | |
2423 | ||
2424 | if (sdev->type == TYPE_DISK) { | |
2425 | timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies); | |
2426 | blk_queue_rq_timeout(q, timeout); | |
2427 | } | |
2428 | ||
2429 | return 0; | |
2430 | } | |
2431 | ||
ee959b00 TJ |
2432 | static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr, |
2433 | char *buf) | |
6ecb0c84 | 2434 | { |
ee959b00 | 2435 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 2436 | |
6ecb0c84 RD |
2437 | return sprintf(buf, "0x%016llx\n", |
2438 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
2439 | } | |
2440 | ||
ee959b00 TJ |
2441 | static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr, |
2442 | char *buf) | |
6ecb0c84 | 2443 | { |
ee959b00 | 2444 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 2445 | |
6ecb0c84 RD |
2446 | return sprintf(buf, "0x%016llx\n", |
2447 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
2448 | } | |
2449 | ||
ee959b00 TJ |
2450 | static ssize_t show_service_id(struct device *dev, |
2451 | struct device_attribute *attr, char *buf) | |
6ecb0c84 | 2452 | { |
ee959b00 | 2453 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 2454 | |
6ecb0c84 RD |
2455 | return sprintf(buf, "0x%016llx\n", |
2456 | (unsigned long long) be64_to_cpu(target->service_id)); | |
2457 | } | |
2458 | ||
ee959b00 TJ |
2459 | static ssize_t show_pkey(struct device *dev, struct device_attribute *attr, |
2460 | char *buf) | |
6ecb0c84 | 2461 | { |
ee959b00 | 2462 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 2463 | |
6ecb0c84 RD |
2464 | return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); |
2465 | } | |
2466 | ||
848b3082 BVA |
2467 | static ssize_t show_sgid(struct device *dev, struct device_attribute *attr, |
2468 | char *buf) | |
2469 | { | |
2470 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
2471 | ||
2472 | return sprintf(buf, "%pI6\n", target->path.sgid.raw); | |
2473 | } | |
2474 | ||
ee959b00 TJ |
2475 | static ssize_t show_dgid(struct device *dev, struct device_attribute *attr, |
2476 | char *buf) | |
6ecb0c84 | 2477 | { |
ee959b00 | 2478 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 2479 | |
5b095d98 | 2480 | return sprintf(buf, "%pI6\n", target->path.dgid.raw); |
6ecb0c84 RD |
2481 | } |
2482 | ||
ee959b00 TJ |
2483 | static ssize_t show_orig_dgid(struct device *dev, |
2484 | struct device_attribute *attr, char *buf) | |
3633b3d0 | 2485 | { |
ee959b00 | 2486 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
3633b3d0 | 2487 | |
5b095d98 | 2488 | return sprintf(buf, "%pI6\n", target->orig_dgid); |
3633b3d0 IR |
2489 | } |
2490 | ||
89de7486 BVA |
2491 | static ssize_t show_req_lim(struct device *dev, |
2492 | struct device_attribute *attr, char *buf) | |
2493 | { | |
2494 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
2495 | ||
89de7486 BVA |
2496 | return sprintf(buf, "%d\n", target->req_lim); |
2497 | } | |
2498 | ||
ee959b00 TJ |
2499 | static ssize_t show_zero_req_lim(struct device *dev, |
2500 | struct device_attribute *attr, char *buf) | |
6bfa24fa | 2501 | { |
ee959b00 | 2502 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6bfa24fa | 2503 | |
6bfa24fa RD |
2504 | return sprintf(buf, "%d\n", target->zero_req_lim); |
2505 | } | |
2506 | ||
ee959b00 TJ |
2507 | static ssize_t show_local_ib_port(struct device *dev, |
2508 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 2509 | { |
ee959b00 | 2510 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 IR |
2511 | |
2512 | return sprintf(buf, "%d\n", target->srp_host->port); | |
2513 | } | |
2514 | ||
ee959b00 TJ |
2515 | static ssize_t show_local_ib_device(struct device *dev, |
2516 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 2517 | { |
ee959b00 | 2518 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 | 2519 | |
05321937 | 2520 | return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name); |
ded7f1a1 IR |
2521 | } |
2522 | ||
4b5e5f41 BVA |
2523 | static ssize_t show_comp_vector(struct device *dev, |
2524 | struct device_attribute *attr, char *buf) | |
2525 | { | |
2526 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
2527 | ||
2528 | return sprintf(buf, "%d\n", target->comp_vector); | |
2529 | } | |
2530 | ||
7bb312e4 VP |
2531 | static ssize_t show_tl_retry_count(struct device *dev, |
2532 | struct device_attribute *attr, char *buf) | |
2533 | { | |
2534 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
2535 | ||
2536 | return sprintf(buf, "%d\n", target->tl_retry_count); | |
2537 | } | |
2538 | ||
49248644 DD |
2539 | static ssize_t show_cmd_sg_entries(struct device *dev, |
2540 | struct device_attribute *attr, char *buf) | |
2541 | { | |
2542 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
2543 | ||
2544 | return sprintf(buf, "%u\n", target->cmd_sg_cnt); | |
2545 | } | |
2546 | ||
c07d424d DD |
2547 | static ssize_t show_allow_ext_sg(struct device *dev, |
2548 | struct device_attribute *attr, char *buf) | |
2549 | { | |
2550 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
2551 | ||
2552 | return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false"); | |
2553 | } | |
2554 | ||
ee959b00 TJ |
2555 | static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); |
2556 | static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); | |
2557 | static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); | |
2558 | static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); | |
848b3082 | 2559 | static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL); |
ee959b00 TJ |
2560 | static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); |
2561 | static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL); | |
89de7486 | 2562 | static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL); |
ee959b00 TJ |
2563 | static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); |
2564 | static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); | |
2565 | static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); | |
4b5e5f41 | 2566 | static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL); |
7bb312e4 | 2567 | static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL); |
49248644 | 2568 | static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL); |
c07d424d | 2569 | static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL); |
ee959b00 TJ |
2570 | |
2571 | static struct device_attribute *srp_host_attrs[] = { | |
2572 | &dev_attr_id_ext, | |
2573 | &dev_attr_ioc_guid, | |
2574 | &dev_attr_service_id, | |
2575 | &dev_attr_pkey, | |
848b3082 | 2576 | &dev_attr_sgid, |
ee959b00 TJ |
2577 | &dev_attr_dgid, |
2578 | &dev_attr_orig_dgid, | |
89de7486 | 2579 | &dev_attr_req_lim, |
ee959b00 TJ |
2580 | &dev_attr_zero_req_lim, |
2581 | &dev_attr_local_ib_port, | |
2582 | &dev_attr_local_ib_device, | |
4b5e5f41 | 2583 | &dev_attr_comp_vector, |
7bb312e4 | 2584 | &dev_attr_tl_retry_count, |
49248644 | 2585 | &dev_attr_cmd_sg_entries, |
c07d424d | 2586 | &dev_attr_allow_ext_sg, |
6ecb0c84 RD |
2587 | NULL |
2588 | }; | |
2589 | ||
aef9ec39 RD |
2590 | static struct scsi_host_template srp_template = { |
2591 | .module = THIS_MODULE, | |
b7f008fd RD |
2592 | .name = "InfiniBand SRP initiator", |
2593 | .proc_name = DRV_NAME, | |
c9b03c1a | 2594 | .slave_configure = srp_slave_configure, |
aef9ec39 RD |
2595 | .info = srp_target_info, |
2596 | .queuecommand = srp_queuecommand, | |
71444b97 JW |
2597 | .change_queue_depth = srp_change_queue_depth, |
2598 | .change_queue_type = srp_change_queue_type, | |
aef9ec39 RD |
2599 | .eh_abort_handler = srp_abort, |
2600 | .eh_device_reset_handler = srp_reset_device, | |
2601 | .eh_host_reset_handler = srp_reset_host, | |
2742c1da | 2602 | .skip_settle_delay = true, |
49248644 | 2603 | .sg_tablesize = SRP_DEF_SG_TABLESIZE, |
4d73f95f | 2604 | .can_queue = SRP_DEFAULT_CMD_SQ_SIZE, |
aef9ec39 | 2605 | .this_id = -1, |
4d73f95f | 2606 | .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE, |
6ecb0c84 RD |
2607 | .use_clustering = ENABLE_CLUSTERING, |
2608 | .shost_attrs = srp_host_attrs | |
aef9ec39 RD |
2609 | }; |
2610 | ||
2611 | static int srp_add_target(struct srp_host *host, struct srp_target_port *target) | |
2612 | { | |
3236822b FT |
2613 | struct srp_rport_identifiers ids; |
2614 | struct srp_rport *rport; | |
2615 | ||
aef9ec39 RD |
2616 | sprintf(target->target_name, "SRP.T10:%016llX", |
2617 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
2618 | ||
05321937 | 2619 | if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device)) |
aef9ec39 RD |
2620 | return -ENODEV; |
2621 | ||
3236822b FT |
2622 | memcpy(ids.port_id, &target->id_ext, 8); |
2623 | memcpy(ids.port_id + 8, &target->ioc_guid, 8); | |
aebd5e47 | 2624 | ids.roles = SRP_RPORT_ROLE_TARGET; |
3236822b FT |
2625 | rport = srp_rport_add(target->scsi_host, &ids); |
2626 | if (IS_ERR(rport)) { | |
2627 | scsi_remove_host(target->scsi_host); | |
2628 | return PTR_ERR(rport); | |
2629 | } | |
2630 | ||
dc1bdbd9 | 2631 | rport->lld_data = target; |
9dd69a60 | 2632 | target->rport = rport; |
dc1bdbd9 | 2633 | |
b3589fd4 | 2634 | spin_lock(&host->target_lock); |
aef9ec39 | 2635 | list_add_tail(&target->list, &host->target_list); |
b3589fd4 | 2636 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
2637 | |
2638 | target->state = SRP_TARGET_LIVE; | |
2639 | ||
aef9ec39 | 2640 | scsi_scan_target(&target->scsi_host->shost_gendev, |
1962a4a1 | 2641 | 0, target->scsi_id, SCAN_WILD_CARD, 0); |
aef9ec39 RD |
2642 | |
2643 | return 0; | |
2644 | } | |
2645 | ||
ee959b00 | 2646 | static void srp_release_dev(struct device *dev) |
aef9ec39 RD |
2647 | { |
2648 | struct srp_host *host = | |
ee959b00 | 2649 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2650 | |
2651 | complete(&host->released); | |
2652 | } | |
2653 | ||
2654 | static struct class srp_class = { | |
2655 | .name = "infiniband_srp", | |
ee959b00 | 2656 | .dev_release = srp_release_dev |
aef9ec39 RD |
2657 | }; |
2658 | ||
96fc248a BVA |
2659 | /** |
2660 | * srp_conn_unique() - check whether the connection to a target is unique | |
af24663b BVA |
2661 | * @host: SRP host. |
2662 | * @target: SRP target port. | |
96fc248a BVA |
2663 | */ |
2664 | static bool srp_conn_unique(struct srp_host *host, | |
2665 | struct srp_target_port *target) | |
2666 | { | |
2667 | struct srp_target_port *t; | |
2668 | bool ret = false; | |
2669 | ||
2670 | if (target->state == SRP_TARGET_REMOVED) | |
2671 | goto out; | |
2672 | ||
2673 | ret = true; | |
2674 | ||
2675 | spin_lock(&host->target_lock); | |
2676 | list_for_each_entry(t, &host->target_list, list) { | |
2677 | if (t != target && | |
2678 | target->id_ext == t->id_ext && | |
2679 | target->ioc_guid == t->ioc_guid && | |
2680 | target->initiator_ext == t->initiator_ext) { | |
2681 | ret = false; | |
2682 | break; | |
2683 | } | |
2684 | } | |
2685 | spin_unlock(&host->target_lock); | |
2686 | ||
2687 | out: | |
2688 | return ret; | |
2689 | } | |
2690 | ||
aef9ec39 RD |
2691 | /* |
2692 | * Target ports are added by writing | |
2693 | * | |
2694 | * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, | |
2695 | * pkey=<P_Key>,service_id=<service ID> | |
2696 | * | |
2697 | * to the add_target sysfs attribute. | |
2698 | */ | |
2699 | enum { | |
2700 | SRP_OPT_ERR = 0, | |
2701 | SRP_OPT_ID_EXT = 1 << 0, | |
2702 | SRP_OPT_IOC_GUID = 1 << 1, | |
2703 | SRP_OPT_DGID = 1 << 2, | |
2704 | SRP_OPT_PKEY = 1 << 3, | |
2705 | SRP_OPT_SERVICE_ID = 1 << 4, | |
2706 | SRP_OPT_MAX_SECT = 1 << 5, | |
52fb2b50 | 2707 | SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, |
0c0450db | 2708 | SRP_OPT_IO_CLASS = 1 << 7, |
01cb9bcb | 2709 | SRP_OPT_INITIATOR_EXT = 1 << 8, |
49248644 | 2710 | SRP_OPT_CMD_SG_ENTRIES = 1 << 9, |
c07d424d DD |
2711 | SRP_OPT_ALLOW_EXT_SG = 1 << 10, |
2712 | SRP_OPT_SG_TABLESIZE = 1 << 11, | |
4b5e5f41 | 2713 | SRP_OPT_COMP_VECTOR = 1 << 12, |
7bb312e4 | 2714 | SRP_OPT_TL_RETRY_COUNT = 1 << 13, |
4d73f95f | 2715 | SRP_OPT_QUEUE_SIZE = 1 << 14, |
aef9ec39 RD |
2716 | SRP_OPT_ALL = (SRP_OPT_ID_EXT | |
2717 | SRP_OPT_IOC_GUID | | |
2718 | SRP_OPT_DGID | | |
2719 | SRP_OPT_PKEY | | |
2720 | SRP_OPT_SERVICE_ID), | |
2721 | }; | |
2722 | ||
a447c093 | 2723 | static const match_table_t srp_opt_tokens = { |
52fb2b50 VP |
2724 | { SRP_OPT_ID_EXT, "id_ext=%s" }, |
2725 | { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, | |
2726 | { SRP_OPT_DGID, "dgid=%s" }, | |
2727 | { SRP_OPT_PKEY, "pkey=%x" }, | |
2728 | { SRP_OPT_SERVICE_ID, "service_id=%s" }, | |
2729 | { SRP_OPT_MAX_SECT, "max_sect=%d" }, | |
2730 | { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, | |
0c0450db | 2731 | { SRP_OPT_IO_CLASS, "io_class=%x" }, |
01cb9bcb | 2732 | { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, |
49248644 | 2733 | { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" }, |
c07d424d DD |
2734 | { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" }, |
2735 | { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" }, | |
4b5e5f41 | 2736 | { SRP_OPT_COMP_VECTOR, "comp_vector=%u" }, |
7bb312e4 | 2737 | { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" }, |
4d73f95f | 2738 | { SRP_OPT_QUEUE_SIZE, "queue_size=%d" }, |
52fb2b50 | 2739 | { SRP_OPT_ERR, NULL } |
aef9ec39 RD |
2740 | }; |
2741 | ||
2742 | static int srp_parse_options(const char *buf, struct srp_target_port *target) | |
2743 | { | |
2744 | char *options, *sep_opt; | |
2745 | char *p; | |
2746 | char dgid[3]; | |
2747 | substring_t args[MAX_OPT_ARGS]; | |
2748 | int opt_mask = 0; | |
2749 | int token; | |
2750 | int ret = -EINVAL; | |
2751 | int i; | |
2752 | ||
2753 | options = kstrdup(buf, GFP_KERNEL); | |
2754 | if (!options) | |
2755 | return -ENOMEM; | |
2756 | ||
2757 | sep_opt = options; | |
2758 | while ((p = strsep(&sep_opt, ",")) != NULL) { | |
2759 | if (!*p) | |
2760 | continue; | |
2761 | ||
2762 | token = match_token(p, srp_opt_tokens, args); | |
2763 | opt_mask |= token; | |
2764 | ||
2765 | switch (token) { | |
2766 | case SRP_OPT_ID_EXT: | |
2767 | p = match_strdup(args); | |
a20f3a6d IR |
2768 | if (!p) { |
2769 | ret = -ENOMEM; | |
2770 | goto out; | |
2771 | } | |
aef9ec39 RD |
2772 | target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2773 | kfree(p); | |
2774 | break; | |
2775 | ||
2776 | case SRP_OPT_IOC_GUID: | |
2777 | p = match_strdup(args); | |
a20f3a6d IR |
2778 | if (!p) { |
2779 | ret = -ENOMEM; | |
2780 | goto out; | |
2781 | } | |
aef9ec39 RD |
2782 | target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2783 | kfree(p); | |
2784 | break; | |
2785 | ||
2786 | case SRP_OPT_DGID: | |
2787 | p = match_strdup(args); | |
a20f3a6d IR |
2788 | if (!p) { |
2789 | ret = -ENOMEM; | |
2790 | goto out; | |
2791 | } | |
aef9ec39 | 2792 | if (strlen(p) != 32) { |
e0bda7d8 | 2793 | pr_warn("bad dest GID parameter '%s'\n", p); |
ce1823f0 | 2794 | kfree(p); |
aef9ec39 RD |
2795 | goto out; |
2796 | } | |
2797 | ||
2798 | for (i = 0; i < 16; ++i) { | |
2799 | strlcpy(dgid, p + i * 2, 3); | |
2800 | target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); | |
2801 | } | |
bf17c1c7 | 2802 | kfree(p); |
3633b3d0 | 2803 | memcpy(target->orig_dgid, target->path.dgid.raw, 16); |
aef9ec39 RD |
2804 | break; |
2805 | ||
2806 | case SRP_OPT_PKEY: | |
2807 | if (match_hex(args, &token)) { | |
e0bda7d8 | 2808 | pr_warn("bad P_Key parameter '%s'\n", p); |
aef9ec39 RD |
2809 | goto out; |
2810 | } | |
2811 | target->path.pkey = cpu_to_be16(token); | |
2812 | break; | |
2813 | ||
2814 | case SRP_OPT_SERVICE_ID: | |
2815 | p = match_strdup(args); | |
a20f3a6d IR |
2816 | if (!p) { |
2817 | ret = -ENOMEM; | |
2818 | goto out; | |
2819 | } | |
aef9ec39 | 2820 | target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
247e020e | 2821 | target->path.service_id = target->service_id; |
aef9ec39 RD |
2822 | kfree(p); |
2823 | break; | |
2824 | ||
2825 | case SRP_OPT_MAX_SECT: | |
2826 | if (match_int(args, &token)) { | |
e0bda7d8 | 2827 | pr_warn("bad max sect parameter '%s'\n", p); |
aef9ec39 RD |
2828 | goto out; |
2829 | } | |
2830 | target->scsi_host->max_sectors = token; | |
2831 | break; | |
2832 | ||
4d73f95f BVA |
2833 | case SRP_OPT_QUEUE_SIZE: |
2834 | if (match_int(args, &token) || token < 1) { | |
2835 | pr_warn("bad queue_size parameter '%s'\n", p); | |
2836 | goto out; | |
2837 | } | |
2838 | target->scsi_host->can_queue = token; | |
2839 | target->queue_size = token + SRP_RSP_SQ_SIZE + | |
2840 | SRP_TSK_MGMT_SQ_SIZE; | |
2841 | if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN)) | |
2842 | target->scsi_host->cmd_per_lun = token; | |
2843 | break; | |
2844 | ||
52fb2b50 | 2845 | case SRP_OPT_MAX_CMD_PER_LUN: |
4d73f95f | 2846 | if (match_int(args, &token) || token < 1) { |
e0bda7d8 BVA |
2847 | pr_warn("bad max cmd_per_lun parameter '%s'\n", |
2848 | p); | |
52fb2b50 VP |
2849 | goto out; |
2850 | } | |
4d73f95f | 2851 | target->scsi_host->cmd_per_lun = token; |
52fb2b50 VP |
2852 | break; |
2853 | ||
0c0450db R |
2854 | case SRP_OPT_IO_CLASS: |
2855 | if (match_hex(args, &token)) { | |
e0bda7d8 | 2856 | pr_warn("bad IO class parameter '%s'\n", p); |
0c0450db R |
2857 | goto out; |
2858 | } | |
2859 | if (token != SRP_REV10_IB_IO_CLASS && | |
2860 | token != SRP_REV16A_IB_IO_CLASS) { | |
e0bda7d8 BVA |
2861 | pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n", |
2862 | token, SRP_REV10_IB_IO_CLASS, | |
2863 | SRP_REV16A_IB_IO_CLASS); | |
0c0450db R |
2864 | goto out; |
2865 | } | |
2866 | target->io_class = token; | |
2867 | break; | |
2868 | ||
01cb9bcb IR |
2869 | case SRP_OPT_INITIATOR_EXT: |
2870 | p = match_strdup(args); | |
a20f3a6d IR |
2871 | if (!p) { |
2872 | ret = -ENOMEM; | |
2873 | goto out; | |
2874 | } | |
01cb9bcb IR |
2875 | target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2876 | kfree(p); | |
2877 | break; | |
2878 | ||
49248644 DD |
2879 | case SRP_OPT_CMD_SG_ENTRIES: |
2880 | if (match_int(args, &token) || token < 1 || token > 255) { | |
e0bda7d8 BVA |
2881 | pr_warn("bad max cmd_sg_entries parameter '%s'\n", |
2882 | p); | |
49248644 DD |
2883 | goto out; |
2884 | } | |
2885 | target->cmd_sg_cnt = token; | |
2886 | break; | |
2887 | ||
c07d424d DD |
2888 | case SRP_OPT_ALLOW_EXT_SG: |
2889 | if (match_int(args, &token)) { | |
e0bda7d8 | 2890 | pr_warn("bad allow_ext_sg parameter '%s'\n", p); |
c07d424d DD |
2891 | goto out; |
2892 | } | |
2893 | target->allow_ext_sg = !!token; | |
2894 | break; | |
2895 | ||
2896 | case SRP_OPT_SG_TABLESIZE: | |
2897 | if (match_int(args, &token) || token < 1 || | |
2898 | token > SCSI_MAX_SG_CHAIN_SEGMENTS) { | |
e0bda7d8 BVA |
2899 | pr_warn("bad max sg_tablesize parameter '%s'\n", |
2900 | p); | |
c07d424d DD |
2901 | goto out; |
2902 | } | |
2903 | target->sg_tablesize = token; | |
2904 | break; | |
2905 | ||
4b5e5f41 BVA |
2906 | case SRP_OPT_COMP_VECTOR: |
2907 | if (match_int(args, &token) || token < 0) { | |
2908 | pr_warn("bad comp_vector parameter '%s'\n", p); | |
2909 | goto out; | |
2910 | } | |
2911 | target->comp_vector = token; | |
2912 | break; | |
2913 | ||
7bb312e4 VP |
2914 | case SRP_OPT_TL_RETRY_COUNT: |
2915 | if (match_int(args, &token) || token < 2 || token > 7) { | |
2916 | pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n", | |
2917 | p); | |
2918 | goto out; | |
2919 | } | |
2920 | target->tl_retry_count = token; | |
2921 | break; | |
2922 | ||
aef9ec39 | 2923 | default: |
e0bda7d8 BVA |
2924 | pr_warn("unknown parameter or missing value '%s' in target creation request\n", |
2925 | p); | |
aef9ec39 RD |
2926 | goto out; |
2927 | } | |
2928 | } | |
2929 | ||
2930 | if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) | |
2931 | ret = 0; | |
2932 | else | |
2933 | for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) | |
2934 | if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && | |
2935 | !(srp_opt_tokens[i].token & opt_mask)) | |
e0bda7d8 BVA |
2936 | pr_warn("target creation request is missing parameter '%s'\n", |
2937 | srp_opt_tokens[i].pattern); | |
aef9ec39 | 2938 | |
4d73f95f BVA |
2939 | if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue |
2940 | && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN)) | |
2941 | pr_warn("cmd_per_lun = %d > queue_size = %d\n", | |
2942 | target->scsi_host->cmd_per_lun, | |
2943 | target->scsi_host->can_queue); | |
2944 | ||
aef9ec39 RD |
2945 | out: |
2946 | kfree(options); | |
2947 | return ret; | |
2948 | } | |
2949 | ||
ee959b00 TJ |
2950 | static ssize_t srp_create_target(struct device *dev, |
2951 | struct device_attribute *attr, | |
aef9ec39 RD |
2952 | const char *buf, size_t count) |
2953 | { | |
2954 | struct srp_host *host = | |
ee959b00 | 2955 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2956 | struct Scsi_Host *target_host; |
2957 | struct srp_target_port *target; | |
d1b4289e BVA |
2958 | struct srp_device *srp_dev = host->srp_dev; |
2959 | struct ib_device *ibdev = srp_dev->dev; | |
b81d00bd | 2960 | int ret; |
aef9ec39 RD |
2961 | |
2962 | target_host = scsi_host_alloc(&srp_template, | |
2963 | sizeof (struct srp_target_port)); | |
2964 | if (!target_host) | |
2965 | return -ENOMEM; | |
2966 | ||
49248644 | 2967 | target_host->transportt = ib_srp_transport_template; |
fd1b6c4a BVA |
2968 | target_host->max_channel = 0; |
2969 | target_host->max_id = 1; | |
3c8edf0e AR |
2970 | target_host->max_lun = SRP_MAX_LUN; |
2971 | target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; | |
5f068992 | 2972 | |
aef9ec39 | 2973 | target = host_to_target(target_host); |
aef9ec39 | 2974 | |
49248644 DD |
2975 | target->io_class = SRP_REV16A_IB_IO_CLASS; |
2976 | target->scsi_host = target_host; | |
2977 | target->srp_host = host; | |
2978 | target->lkey = host->srp_dev->mr->lkey; | |
2979 | target->rkey = host->srp_dev->mr->rkey; | |
2980 | target->cmd_sg_cnt = cmd_sg_entries; | |
c07d424d DD |
2981 | target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries; |
2982 | target->allow_ext_sg = allow_ext_sg; | |
7bb312e4 | 2983 | target->tl_retry_count = 7; |
4d73f95f | 2984 | target->queue_size = SRP_DEFAULT_QUEUE_SIZE; |
aef9ec39 | 2985 | |
2d7091bc BVA |
2986 | mutex_lock(&host->add_target_mutex); |
2987 | ||
aef9ec39 RD |
2988 | ret = srp_parse_options(buf, target); |
2989 | if (ret) | |
2990 | goto err; | |
2991 | ||
4d73f95f BVA |
2992 | target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE; |
2993 | ||
96fc248a BVA |
2994 | if (!srp_conn_unique(target->srp_host, target)) { |
2995 | shost_printk(KERN_INFO, target->scsi_host, | |
2996 | PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n", | |
2997 | be64_to_cpu(target->id_ext), | |
2998 | be64_to_cpu(target->ioc_guid), | |
2999 | be64_to_cpu(target->initiator_ext)); | |
3000 | ret = -EEXIST; | |
3001 | goto err; | |
3002 | } | |
3003 | ||
5cfb1782 | 3004 | if (!srp_dev->has_fmr && !srp_dev->has_fr && !target->allow_ext_sg && |
d1b4289e | 3005 | target->cmd_sg_cnt < target->sg_tablesize) { |
5cfb1782 | 3006 | pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n"); |
c07d424d DD |
3007 | target->sg_tablesize = target->cmd_sg_cnt; |
3008 | } | |
3009 | ||
3010 | target_host->sg_tablesize = target->sg_tablesize; | |
3011 | target->indirect_size = target->sg_tablesize * | |
3012 | sizeof (struct srp_direct_buf); | |
49248644 DD |
3013 | target->max_iu_len = sizeof (struct srp_cmd) + |
3014 | sizeof (struct srp_indirect_buf) + | |
3015 | target->cmd_sg_cnt * sizeof (struct srp_direct_buf); | |
3016 | ||
c1120f89 | 3017 | INIT_WORK(&target->tl_err_work, srp_tl_err_work); |
ef6c49d8 | 3018 | INIT_WORK(&target->remove_work, srp_remove_work); |
8f26c9ff DD |
3019 | spin_lock_init(&target->lock); |
3020 | INIT_LIST_HEAD(&target->free_tx); | |
b81d00bd BVA |
3021 | ret = srp_alloc_req_data(target); |
3022 | if (ret) | |
3023 | goto err_free_mem; | |
8f26c9ff | 3024 | |
2088ca66 SG |
3025 | ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid); |
3026 | if (ret) | |
3027 | goto err_free_mem; | |
aef9ec39 | 3028 | |
aef9ec39 RD |
3029 | ret = srp_create_target_ib(target); |
3030 | if (ret) | |
8f26c9ff | 3031 | goto err_free_mem; |
aef9ec39 | 3032 | |
9fe4bcf4 DD |
3033 | ret = srp_new_cm_id(target); |
3034 | if (ret) | |
8f26c9ff | 3035 | goto err_free_ib; |
aef9ec39 RD |
3036 | |
3037 | ret = srp_connect_target(target); | |
3038 | if (ret) { | |
7aa54bd7 DD |
3039 | shost_printk(KERN_ERR, target->scsi_host, |
3040 | PFX "Connection failed\n"); | |
aef9ec39 RD |
3041 | goto err_cm_id; |
3042 | } | |
3043 | ||
3044 | ret = srp_add_target(host, target); | |
3045 | if (ret) | |
3046 | goto err_disconnect; | |
3047 | ||
e7ffde01 BVA |
3048 | shost_printk(KERN_DEBUG, target->scsi_host, PFX |
3049 | "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n", | |
3050 | be64_to_cpu(target->id_ext), | |
3051 | be64_to_cpu(target->ioc_guid), | |
3052 | be16_to_cpu(target->path.pkey), | |
3053 | be64_to_cpu(target->service_id), | |
3054 | target->path.sgid.raw, target->path.dgid.raw); | |
3055 | ||
2d7091bc BVA |
3056 | ret = count; |
3057 | ||
3058 | out: | |
3059 | mutex_unlock(&host->add_target_mutex); | |
3060 | return ret; | |
aef9ec39 RD |
3061 | |
3062 | err_disconnect: | |
3063 | srp_disconnect_target(target); | |
3064 | ||
3065 | err_cm_id: | |
3066 | ib_destroy_cm_id(target->cm_id); | |
3067 | ||
8f26c9ff | 3068 | err_free_ib: |
aef9ec39 RD |
3069 | srp_free_target_ib(target); |
3070 | ||
8f26c9ff DD |
3071 | err_free_mem: |
3072 | srp_free_req_data(target); | |
3073 | ||
aef9ec39 RD |
3074 | err: |
3075 | scsi_host_put(target_host); | |
2d7091bc | 3076 | goto out; |
aef9ec39 RD |
3077 | } |
3078 | ||
ee959b00 | 3079 | static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); |
aef9ec39 | 3080 | |
ee959b00 TJ |
3081 | static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, |
3082 | char *buf) | |
aef9ec39 | 3083 | { |
ee959b00 | 3084 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 | 3085 | |
05321937 | 3086 | return sprintf(buf, "%s\n", host->srp_dev->dev->name); |
aef9ec39 RD |
3087 | } |
3088 | ||
ee959b00 | 3089 | static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
aef9ec39 | 3090 | |
ee959b00 TJ |
3091 | static ssize_t show_port(struct device *dev, struct device_attribute *attr, |
3092 | char *buf) | |
aef9ec39 | 3093 | { |
ee959b00 | 3094 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
3095 | |
3096 | return sprintf(buf, "%d\n", host->port); | |
3097 | } | |
3098 | ||
ee959b00 | 3099 | static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); |
aef9ec39 | 3100 | |
f5358a17 | 3101 | static struct srp_host *srp_add_port(struct srp_device *device, u8 port) |
aef9ec39 RD |
3102 | { |
3103 | struct srp_host *host; | |
3104 | ||
3105 | host = kzalloc(sizeof *host, GFP_KERNEL); | |
3106 | if (!host) | |
3107 | return NULL; | |
3108 | ||
3109 | INIT_LIST_HEAD(&host->target_list); | |
b3589fd4 | 3110 | spin_lock_init(&host->target_lock); |
aef9ec39 | 3111 | init_completion(&host->released); |
2d7091bc | 3112 | mutex_init(&host->add_target_mutex); |
05321937 | 3113 | host->srp_dev = device; |
aef9ec39 RD |
3114 | host->port = port; |
3115 | ||
ee959b00 TJ |
3116 | host->dev.class = &srp_class; |
3117 | host->dev.parent = device->dev->dma_device; | |
d927e38c | 3118 | dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port); |
aef9ec39 | 3119 | |
ee959b00 | 3120 | if (device_register(&host->dev)) |
f5358a17 | 3121 | goto free_host; |
ee959b00 | 3122 | if (device_create_file(&host->dev, &dev_attr_add_target)) |
aef9ec39 | 3123 | goto err_class; |
ee959b00 | 3124 | if (device_create_file(&host->dev, &dev_attr_ibdev)) |
aef9ec39 | 3125 | goto err_class; |
ee959b00 | 3126 | if (device_create_file(&host->dev, &dev_attr_port)) |
aef9ec39 RD |
3127 | goto err_class; |
3128 | ||
3129 | return host; | |
3130 | ||
3131 | err_class: | |
ee959b00 | 3132 | device_unregister(&host->dev); |
aef9ec39 | 3133 | |
f5358a17 | 3134 | free_host: |
aef9ec39 RD |
3135 | kfree(host); |
3136 | ||
3137 | return NULL; | |
3138 | } | |
3139 | ||
3140 | static void srp_add_one(struct ib_device *device) | |
3141 | { | |
f5358a17 RD |
3142 | struct srp_device *srp_dev; |
3143 | struct ib_device_attr *dev_attr; | |
aef9ec39 | 3144 | struct srp_host *host; |
52ede08f BVA |
3145 | int mr_page_shift, s, e, p; |
3146 | u64 max_pages_per_mr; | |
aef9ec39 | 3147 | |
f5358a17 RD |
3148 | dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); |
3149 | if (!dev_attr) | |
cf311cd4 | 3150 | return; |
aef9ec39 | 3151 | |
f5358a17 | 3152 | if (ib_query_device(device, dev_attr)) { |
e0bda7d8 | 3153 | pr_warn("Query device failed for %s\n", device->name); |
f5358a17 RD |
3154 | goto free_attr; |
3155 | } | |
3156 | ||
3157 | srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); | |
3158 | if (!srp_dev) | |
3159 | goto free_attr; | |
3160 | ||
d1b4289e BVA |
3161 | srp_dev->has_fmr = (device->alloc_fmr && device->dealloc_fmr && |
3162 | device->map_phys_fmr && device->unmap_fmr); | |
5cfb1782 BVA |
3163 | srp_dev->has_fr = (dev_attr->device_cap_flags & |
3164 | IB_DEVICE_MEM_MGT_EXTENSIONS); | |
3165 | if (!srp_dev->has_fmr && !srp_dev->has_fr) | |
3166 | dev_warn(&device->dev, "neither FMR nor FR is supported\n"); | |
3167 | ||
3168 | srp_dev->use_fast_reg = (srp_dev->has_fr && | |
3169 | (!srp_dev->has_fmr || prefer_fr)); | |
d1b4289e | 3170 | |
f5358a17 RD |
3171 | /* |
3172 | * Use the smallest page size supported by the HCA, down to a | |
8f26c9ff DD |
3173 | * minimum of 4096 bytes. We're unlikely to build large sglists |
3174 | * out of smaller entries. | |
f5358a17 | 3175 | */ |
52ede08f BVA |
3176 | mr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1); |
3177 | srp_dev->mr_page_size = 1 << mr_page_shift; | |
3178 | srp_dev->mr_page_mask = ~((u64) srp_dev->mr_page_size - 1); | |
3179 | max_pages_per_mr = dev_attr->max_mr_size; | |
3180 | do_div(max_pages_per_mr, srp_dev->mr_page_size); | |
3181 | srp_dev->max_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR, | |
3182 | max_pages_per_mr); | |
5cfb1782 BVA |
3183 | if (srp_dev->use_fast_reg) { |
3184 | srp_dev->max_pages_per_mr = | |
3185 | min_t(u32, srp_dev->max_pages_per_mr, | |
3186 | dev_attr->max_fast_reg_page_list_len); | |
3187 | } | |
52ede08f BVA |
3188 | srp_dev->mr_max_size = srp_dev->mr_page_size * |
3189 | srp_dev->max_pages_per_mr; | |
5cfb1782 | 3190 | 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", |
52ede08f | 3191 | device->name, mr_page_shift, dev_attr->max_mr_size, |
5cfb1782 | 3192 | dev_attr->max_fast_reg_page_list_len, |
52ede08f | 3193 | srp_dev->max_pages_per_mr, srp_dev->mr_max_size); |
f5358a17 RD |
3194 | |
3195 | INIT_LIST_HEAD(&srp_dev->dev_list); | |
3196 | ||
3197 | srp_dev->dev = device; | |
3198 | srp_dev->pd = ib_alloc_pd(device); | |
3199 | if (IS_ERR(srp_dev->pd)) | |
3200 | goto free_dev; | |
3201 | ||
3202 | srp_dev->mr = ib_get_dma_mr(srp_dev->pd, | |
3203 | IB_ACCESS_LOCAL_WRITE | | |
3204 | IB_ACCESS_REMOTE_READ | | |
3205 | IB_ACCESS_REMOTE_WRITE); | |
3206 | if (IS_ERR(srp_dev->mr)) | |
3207 | goto err_pd; | |
3208 | ||
07ebafba | 3209 | if (device->node_type == RDMA_NODE_IB_SWITCH) { |
aef9ec39 RD |
3210 | s = 0; |
3211 | e = 0; | |
3212 | } else { | |
3213 | s = 1; | |
3214 | e = device->phys_port_cnt; | |
3215 | } | |
3216 | ||
3217 | for (p = s; p <= e; ++p) { | |
f5358a17 | 3218 | host = srp_add_port(srp_dev, p); |
aef9ec39 | 3219 | if (host) |
f5358a17 | 3220 | list_add_tail(&host->list, &srp_dev->dev_list); |
aef9ec39 RD |
3221 | } |
3222 | ||
f5358a17 RD |
3223 | ib_set_client_data(device, &srp_client, srp_dev); |
3224 | ||
3225 | goto free_attr; | |
3226 | ||
3227 | err_pd: | |
3228 | ib_dealloc_pd(srp_dev->pd); | |
3229 | ||
3230 | free_dev: | |
3231 | kfree(srp_dev); | |
3232 | ||
3233 | free_attr: | |
3234 | kfree(dev_attr); | |
aef9ec39 RD |
3235 | } |
3236 | ||
3237 | static void srp_remove_one(struct ib_device *device) | |
3238 | { | |
f5358a17 | 3239 | struct srp_device *srp_dev; |
aef9ec39 | 3240 | struct srp_host *host, *tmp_host; |
ef6c49d8 | 3241 | struct srp_target_port *target; |
aef9ec39 | 3242 | |
f5358a17 | 3243 | srp_dev = ib_get_client_data(device, &srp_client); |
1fe0cb84 DB |
3244 | if (!srp_dev) |
3245 | return; | |
aef9ec39 | 3246 | |
f5358a17 | 3247 | list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { |
ee959b00 | 3248 | device_unregister(&host->dev); |
aef9ec39 RD |
3249 | /* |
3250 | * Wait for the sysfs entry to go away, so that no new | |
3251 | * target ports can be created. | |
3252 | */ | |
3253 | wait_for_completion(&host->released); | |
3254 | ||
3255 | /* | |
ef6c49d8 | 3256 | * Remove all target ports. |
aef9ec39 | 3257 | */ |
b3589fd4 | 3258 | spin_lock(&host->target_lock); |
ef6c49d8 BVA |
3259 | list_for_each_entry(target, &host->target_list, list) |
3260 | srp_queue_remove_work(target); | |
b3589fd4 | 3261 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
3262 | |
3263 | /* | |
ef6c49d8 | 3264 | * Wait for target port removal tasks. |
aef9ec39 | 3265 | */ |
ef6c49d8 | 3266 | flush_workqueue(system_long_wq); |
aef9ec39 | 3267 | |
aef9ec39 RD |
3268 | kfree(host); |
3269 | } | |
3270 | ||
f5358a17 RD |
3271 | ib_dereg_mr(srp_dev->mr); |
3272 | ib_dealloc_pd(srp_dev->pd); | |
3273 | ||
3274 | kfree(srp_dev); | |
aef9ec39 RD |
3275 | } |
3276 | ||
3236822b | 3277 | static struct srp_function_template ib_srp_transport_functions = { |
ed9b2264 BVA |
3278 | .has_rport_state = true, |
3279 | .reset_timer_if_blocked = true, | |
a95cadb9 | 3280 | .reconnect_delay = &srp_reconnect_delay, |
ed9b2264 BVA |
3281 | .fast_io_fail_tmo = &srp_fast_io_fail_tmo, |
3282 | .dev_loss_tmo = &srp_dev_loss_tmo, | |
3283 | .reconnect = srp_rport_reconnect, | |
dc1bdbd9 | 3284 | .rport_delete = srp_rport_delete, |
ed9b2264 | 3285 | .terminate_rport_io = srp_terminate_io, |
3236822b FT |
3286 | }; |
3287 | ||
aef9ec39 RD |
3288 | static int __init srp_init_module(void) |
3289 | { | |
3290 | int ret; | |
3291 | ||
dcb4cb85 | 3292 | BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *)); |
dd5e6e38 | 3293 | |
49248644 | 3294 | if (srp_sg_tablesize) { |
e0bda7d8 | 3295 | pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n"); |
49248644 DD |
3296 | if (!cmd_sg_entries) |
3297 | cmd_sg_entries = srp_sg_tablesize; | |
3298 | } | |
3299 | ||
3300 | if (!cmd_sg_entries) | |
3301 | cmd_sg_entries = SRP_DEF_SG_TABLESIZE; | |
3302 | ||
3303 | if (cmd_sg_entries > 255) { | |
e0bda7d8 | 3304 | pr_warn("Clamping cmd_sg_entries to 255\n"); |
49248644 | 3305 | cmd_sg_entries = 255; |
1e89a194 DD |
3306 | } |
3307 | ||
c07d424d DD |
3308 | if (!indirect_sg_entries) |
3309 | indirect_sg_entries = cmd_sg_entries; | |
3310 | else if (indirect_sg_entries < cmd_sg_entries) { | |
e0bda7d8 BVA |
3311 | pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n", |
3312 | cmd_sg_entries); | |
c07d424d DD |
3313 | indirect_sg_entries = cmd_sg_entries; |
3314 | } | |
3315 | ||
3236822b FT |
3316 | ib_srp_transport_template = |
3317 | srp_attach_transport(&ib_srp_transport_functions); | |
3318 | if (!ib_srp_transport_template) | |
3319 | return -ENOMEM; | |
3320 | ||
aef9ec39 RD |
3321 | ret = class_register(&srp_class); |
3322 | if (ret) { | |
e0bda7d8 | 3323 | pr_err("couldn't register class infiniband_srp\n"); |
3236822b | 3324 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
3325 | return ret; |
3326 | } | |
3327 | ||
c1a0b23b MT |
3328 | ib_sa_register_client(&srp_sa_client); |
3329 | ||
aef9ec39 RD |
3330 | ret = ib_register_client(&srp_client); |
3331 | if (ret) { | |
e0bda7d8 | 3332 | pr_err("couldn't register IB client\n"); |
3236822b | 3333 | srp_release_transport(ib_srp_transport_template); |
c1a0b23b | 3334 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 RD |
3335 | class_unregister(&srp_class); |
3336 | return ret; | |
3337 | } | |
3338 | ||
3339 | return 0; | |
3340 | } | |
3341 | ||
3342 | static void __exit srp_cleanup_module(void) | |
3343 | { | |
3344 | ib_unregister_client(&srp_client); | |
c1a0b23b | 3345 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 | 3346 | class_unregister(&srp_class); |
3236822b | 3347 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
3348 | } |
3349 | ||
3350 | module_init(srp_init_module); | |
3351 | module_exit(srp_cleanup_module); |