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aef9ec39 RD |
1 | /* |
2 | * Copyright (c) 2005 Cisco Systems. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
aef9ec39 RD |
31 | */ |
32 | ||
e0bda7d8 BVA |
33 | #define pr_fmt(fmt) PFX fmt |
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> | |
49 | #include <scsi/srp.h> | |
3236822b | 50 | #include <scsi/scsi_transport_srp.h> |
aef9ec39 | 51 | |
aef9ec39 RD |
52 | #include "ib_srp.h" |
53 | ||
54 | #define DRV_NAME "ib_srp" | |
55 | #define PFX DRV_NAME ": " | |
e8ca4135 VP |
56 | #define DRV_VERSION "1.0" |
57 | #define DRV_RELDATE "July 1, 2013" | |
aef9ec39 RD |
58 | |
59 | MODULE_AUTHOR("Roland Dreier"); | |
60 | MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator " | |
61 | "v" DRV_VERSION " (" DRV_RELDATE ")"); | |
62 | MODULE_LICENSE("Dual BSD/GPL"); | |
63 | ||
49248644 DD |
64 | static unsigned int srp_sg_tablesize; |
65 | static unsigned int cmd_sg_entries; | |
c07d424d DD |
66 | static unsigned int indirect_sg_entries; |
67 | static bool allow_ext_sg; | |
49248644 | 68 | static int topspin_workarounds = 1; |
74b0a15b | 69 | |
49248644 DD |
70 | module_param(srp_sg_tablesize, uint, 0444); |
71 | MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries"); | |
74b0a15b | 72 | |
49248644 DD |
73 | module_param(cmd_sg_entries, uint, 0444); |
74 | MODULE_PARM_DESC(cmd_sg_entries, | |
75 | "Default number of gather/scatter entries in the SRP command (default is 12, max 255)"); | |
aef9ec39 | 76 | |
c07d424d DD |
77 | module_param(indirect_sg_entries, uint, 0444); |
78 | MODULE_PARM_DESC(indirect_sg_entries, | |
79 | "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")"); | |
80 | ||
81 | module_param(allow_ext_sg, bool, 0444); | |
82 | MODULE_PARM_DESC(allow_ext_sg, | |
83 | "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)"); | |
84 | ||
aef9ec39 RD |
85 | module_param(topspin_workarounds, int, 0444); |
86 | MODULE_PARM_DESC(topspin_workarounds, | |
87 | "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); | |
88 | ||
ed9b2264 BVA |
89 | static struct kernel_param_ops srp_tmo_ops; |
90 | ||
91 | static int srp_fast_io_fail_tmo = 15; | |
92 | module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo, | |
93 | S_IRUGO | S_IWUSR); | |
94 | MODULE_PARM_DESC(fast_io_fail_tmo, | |
95 | "Number of seconds between the observation of a transport" | |
96 | " layer error and failing all I/O. \"off\" means that this" | |
97 | " functionality is disabled."); | |
98 | ||
99 | static int srp_dev_loss_tmo = 60; | |
100 | module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo, | |
101 | S_IRUGO | S_IWUSR); | |
102 | MODULE_PARM_DESC(dev_loss_tmo, | |
103 | "Maximum number of seconds that the SRP transport should" | |
104 | " insulate transport layer errors. After this time has been" | |
105 | " exceeded the SCSI host is removed. Should be" | |
106 | " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT) | |
107 | " if fast_io_fail_tmo has not been set. \"off\" means that" | |
108 | " this functionality is disabled."); | |
109 | ||
aef9ec39 RD |
110 | static void srp_add_one(struct ib_device *device); |
111 | static void srp_remove_one(struct ib_device *device); | |
9c03dc9f BVA |
112 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr); |
113 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr); | |
aef9ec39 RD |
114 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); |
115 | ||
3236822b FT |
116 | static struct scsi_transport_template *ib_srp_transport_template; |
117 | ||
aef9ec39 RD |
118 | static struct ib_client srp_client = { |
119 | .name = "srp", | |
120 | .add = srp_add_one, | |
121 | .remove = srp_remove_one | |
122 | }; | |
123 | ||
c1a0b23b MT |
124 | static struct ib_sa_client srp_sa_client; |
125 | ||
ed9b2264 BVA |
126 | static int srp_tmo_get(char *buffer, const struct kernel_param *kp) |
127 | { | |
128 | int tmo = *(int *)kp->arg; | |
129 | ||
130 | if (tmo >= 0) | |
131 | return sprintf(buffer, "%d", tmo); | |
132 | else | |
133 | return sprintf(buffer, "off"); | |
134 | } | |
135 | ||
136 | static int srp_tmo_set(const char *val, const struct kernel_param *kp) | |
137 | { | |
138 | int tmo, res; | |
139 | ||
140 | if (strncmp(val, "off", 3) != 0) { | |
141 | res = kstrtoint(val, 0, &tmo); | |
142 | if (res) | |
143 | goto out; | |
144 | } else { | |
145 | tmo = -1; | |
146 | } | |
147 | if (kp->arg == &srp_fast_io_fail_tmo) | |
148 | res = srp_tmo_valid(tmo, srp_dev_loss_tmo); | |
149 | else | |
150 | res = srp_tmo_valid(srp_fast_io_fail_tmo, tmo); | |
151 | if (res) | |
152 | goto out; | |
153 | *(int *)kp->arg = tmo; | |
154 | ||
155 | out: | |
156 | return res; | |
157 | } | |
158 | ||
159 | static struct kernel_param_ops srp_tmo_ops = { | |
160 | .get = srp_tmo_get, | |
161 | .set = srp_tmo_set, | |
162 | }; | |
163 | ||
aef9ec39 RD |
164 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) |
165 | { | |
166 | return (struct srp_target_port *) host->hostdata; | |
167 | } | |
168 | ||
169 | static const char *srp_target_info(struct Scsi_Host *host) | |
170 | { | |
171 | return host_to_target(host)->target_name; | |
172 | } | |
173 | ||
5d7cbfd6 RD |
174 | static int srp_target_is_topspin(struct srp_target_port *target) |
175 | { | |
176 | static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; | |
3d1ff48d | 177 | static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d }; |
5d7cbfd6 RD |
178 | |
179 | return topspin_workarounds && | |
3d1ff48d RK |
180 | (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) || |
181 | !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui)); | |
5d7cbfd6 RD |
182 | } |
183 | ||
aef9ec39 RD |
184 | static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, |
185 | gfp_t gfp_mask, | |
186 | enum dma_data_direction direction) | |
187 | { | |
188 | struct srp_iu *iu; | |
189 | ||
190 | iu = kmalloc(sizeof *iu, gfp_mask); | |
191 | if (!iu) | |
192 | goto out; | |
193 | ||
194 | iu->buf = kzalloc(size, gfp_mask); | |
195 | if (!iu->buf) | |
196 | goto out_free_iu; | |
197 | ||
05321937 GKH |
198 | iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size, |
199 | direction); | |
200 | if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma)) | |
aef9ec39 RD |
201 | goto out_free_buf; |
202 | ||
203 | iu->size = size; | |
204 | iu->direction = direction; | |
205 | ||
206 | return iu; | |
207 | ||
208 | out_free_buf: | |
209 | kfree(iu->buf); | |
210 | out_free_iu: | |
211 | kfree(iu); | |
212 | out: | |
213 | return NULL; | |
214 | } | |
215 | ||
216 | static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) | |
217 | { | |
218 | if (!iu) | |
219 | return; | |
220 | ||
05321937 GKH |
221 | ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size, |
222 | iu->direction); | |
aef9ec39 RD |
223 | kfree(iu->buf); |
224 | kfree(iu); | |
225 | } | |
226 | ||
227 | static void srp_qp_event(struct ib_event *event, void *context) | |
228 | { | |
e0bda7d8 | 229 | pr_debug("QP event %d\n", event->event); |
aef9ec39 RD |
230 | } |
231 | ||
232 | static int srp_init_qp(struct srp_target_port *target, | |
233 | struct ib_qp *qp) | |
234 | { | |
235 | struct ib_qp_attr *attr; | |
236 | int ret; | |
237 | ||
238 | attr = kmalloc(sizeof *attr, GFP_KERNEL); | |
239 | if (!attr) | |
240 | return -ENOMEM; | |
241 | ||
969a60f9 RD |
242 | ret = ib_find_pkey(target->srp_host->srp_dev->dev, |
243 | target->srp_host->port, | |
244 | be16_to_cpu(target->path.pkey), | |
245 | &attr->pkey_index); | |
aef9ec39 RD |
246 | if (ret) |
247 | goto out; | |
248 | ||
249 | attr->qp_state = IB_QPS_INIT; | |
250 | attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | | |
251 | IB_ACCESS_REMOTE_WRITE); | |
252 | attr->port_num = target->srp_host->port; | |
253 | ||
254 | ret = ib_modify_qp(qp, attr, | |
255 | IB_QP_STATE | | |
256 | IB_QP_PKEY_INDEX | | |
257 | IB_QP_ACCESS_FLAGS | | |
258 | IB_QP_PORT); | |
259 | ||
260 | out: | |
261 | kfree(attr); | |
262 | return ret; | |
263 | } | |
264 | ||
9fe4bcf4 DD |
265 | static int srp_new_cm_id(struct srp_target_port *target) |
266 | { | |
267 | struct ib_cm_id *new_cm_id; | |
268 | ||
05321937 | 269 | new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev, |
9fe4bcf4 DD |
270 | srp_cm_handler, target); |
271 | if (IS_ERR(new_cm_id)) | |
272 | return PTR_ERR(new_cm_id); | |
273 | ||
274 | if (target->cm_id) | |
275 | ib_destroy_cm_id(target->cm_id); | |
276 | target->cm_id = new_cm_id; | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
aef9ec39 RD |
281 | static int srp_create_target_ib(struct srp_target_port *target) |
282 | { | |
283 | struct ib_qp_init_attr *init_attr; | |
73aa89ed IR |
284 | struct ib_cq *recv_cq, *send_cq; |
285 | struct ib_qp *qp; | |
aef9ec39 RD |
286 | int ret; |
287 | ||
288 | init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); | |
289 | if (!init_attr) | |
290 | return -ENOMEM; | |
291 | ||
73aa89ed | 292 | recv_cq = ib_create_cq(target->srp_host->srp_dev->dev, |
4b5e5f41 BVA |
293 | srp_recv_completion, NULL, target, SRP_RQ_SIZE, |
294 | target->comp_vector); | |
73aa89ed IR |
295 | if (IS_ERR(recv_cq)) { |
296 | ret = PTR_ERR(recv_cq); | |
da9d2f07 | 297 | goto err; |
aef9ec39 RD |
298 | } |
299 | ||
73aa89ed | 300 | send_cq = ib_create_cq(target->srp_host->srp_dev->dev, |
4b5e5f41 BVA |
301 | srp_send_completion, NULL, target, SRP_SQ_SIZE, |
302 | target->comp_vector); | |
73aa89ed IR |
303 | if (IS_ERR(send_cq)) { |
304 | ret = PTR_ERR(send_cq); | |
da9d2f07 | 305 | goto err_recv_cq; |
9c03dc9f BVA |
306 | } |
307 | ||
73aa89ed | 308 | ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP); |
aef9ec39 RD |
309 | |
310 | init_attr->event_handler = srp_qp_event; | |
311 | init_attr->cap.max_send_wr = SRP_SQ_SIZE; | |
312 | init_attr->cap.max_recv_wr = SRP_RQ_SIZE; | |
313 | init_attr->cap.max_recv_sge = 1; | |
314 | init_attr->cap.max_send_sge = 1; | |
315 | init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; | |
316 | init_attr->qp_type = IB_QPT_RC; | |
73aa89ed IR |
317 | init_attr->send_cq = send_cq; |
318 | init_attr->recv_cq = recv_cq; | |
aef9ec39 | 319 | |
73aa89ed IR |
320 | qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr); |
321 | if (IS_ERR(qp)) { | |
322 | ret = PTR_ERR(qp); | |
da9d2f07 | 323 | goto err_send_cq; |
aef9ec39 RD |
324 | } |
325 | ||
73aa89ed | 326 | ret = srp_init_qp(target, qp); |
da9d2f07 RD |
327 | if (ret) |
328 | goto err_qp; | |
aef9ec39 | 329 | |
73aa89ed IR |
330 | if (target->qp) |
331 | ib_destroy_qp(target->qp); | |
332 | if (target->recv_cq) | |
333 | ib_destroy_cq(target->recv_cq); | |
334 | if (target->send_cq) | |
335 | ib_destroy_cq(target->send_cq); | |
336 | ||
337 | target->qp = qp; | |
338 | target->recv_cq = recv_cq; | |
339 | target->send_cq = send_cq; | |
340 | ||
da9d2f07 RD |
341 | kfree(init_attr); |
342 | return 0; | |
343 | ||
344 | err_qp: | |
73aa89ed | 345 | ib_destroy_qp(qp); |
da9d2f07 RD |
346 | |
347 | err_send_cq: | |
73aa89ed | 348 | ib_destroy_cq(send_cq); |
da9d2f07 RD |
349 | |
350 | err_recv_cq: | |
73aa89ed | 351 | ib_destroy_cq(recv_cq); |
da9d2f07 RD |
352 | |
353 | err: | |
aef9ec39 RD |
354 | kfree(init_attr); |
355 | return ret; | |
356 | } | |
357 | ||
358 | static void srp_free_target_ib(struct srp_target_port *target) | |
359 | { | |
360 | int i; | |
361 | ||
362 | ib_destroy_qp(target->qp); | |
9c03dc9f BVA |
363 | ib_destroy_cq(target->send_cq); |
364 | ib_destroy_cq(target->recv_cq); | |
aef9ec39 | 365 | |
73aa89ed IR |
366 | target->qp = NULL; |
367 | target->send_cq = target->recv_cq = NULL; | |
368 | ||
aef9ec39 RD |
369 | for (i = 0; i < SRP_RQ_SIZE; ++i) |
370 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
dd5e6e38 | 371 | for (i = 0; i < SRP_SQ_SIZE; ++i) |
aef9ec39 RD |
372 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
373 | } | |
374 | ||
375 | static void srp_path_rec_completion(int status, | |
376 | struct ib_sa_path_rec *pathrec, | |
377 | void *target_ptr) | |
378 | { | |
379 | struct srp_target_port *target = target_ptr; | |
380 | ||
381 | target->status = status; | |
382 | if (status) | |
7aa54bd7 DD |
383 | shost_printk(KERN_ERR, target->scsi_host, |
384 | PFX "Got failed path rec status %d\n", status); | |
aef9ec39 RD |
385 | else |
386 | target->path = *pathrec; | |
387 | complete(&target->done); | |
388 | } | |
389 | ||
390 | static int srp_lookup_path(struct srp_target_port *target) | |
391 | { | |
392 | target->path.numb_path = 1; | |
393 | ||
394 | init_completion(&target->done); | |
395 | ||
c1a0b23b | 396 | target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, |
05321937 | 397 | target->srp_host->srp_dev->dev, |
aef9ec39 RD |
398 | target->srp_host->port, |
399 | &target->path, | |
247e020e | 400 | IB_SA_PATH_REC_SERVICE_ID | |
aef9ec39 RD |
401 | IB_SA_PATH_REC_DGID | |
402 | IB_SA_PATH_REC_SGID | | |
403 | IB_SA_PATH_REC_NUMB_PATH | | |
404 | IB_SA_PATH_REC_PKEY, | |
405 | SRP_PATH_REC_TIMEOUT_MS, | |
406 | GFP_KERNEL, | |
407 | srp_path_rec_completion, | |
408 | target, &target->path_query); | |
409 | if (target->path_query_id < 0) | |
410 | return target->path_query_id; | |
411 | ||
412 | wait_for_completion(&target->done); | |
413 | ||
414 | if (target->status < 0) | |
7aa54bd7 DD |
415 | shost_printk(KERN_WARNING, target->scsi_host, |
416 | PFX "Path record query failed\n"); | |
aef9ec39 RD |
417 | |
418 | return target->status; | |
419 | } | |
420 | ||
421 | static int srp_send_req(struct srp_target_port *target) | |
422 | { | |
423 | struct { | |
424 | struct ib_cm_req_param param; | |
425 | struct srp_login_req priv; | |
426 | } *req = NULL; | |
427 | int status; | |
428 | ||
429 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
430 | if (!req) | |
431 | return -ENOMEM; | |
432 | ||
433 | req->param.primary_path = &target->path; | |
434 | req->param.alternate_path = NULL; | |
435 | req->param.service_id = target->service_id; | |
436 | req->param.qp_num = target->qp->qp_num; | |
437 | req->param.qp_type = target->qp->qp_type; | |
438 | req->param.private_data = &req->priv; | |
439 | req->param.private_data_len = sizeof req->priv; | |
440 | req->param.flow_control = 1; | |
441 | ||
442 | get_random_bytes(&req->param.starting_psn, 4); | |
443 | req->param.starting_psn &= 0xffffff; | |
444 | ||
445 | /* | |
446 | * Pick some arbitrary defaults here; we could make these | |
447 | * module parameters if anyone cared about setting them. | |
448 | */ | |
449 | req->param.responder_resources = 4; | |
450 | req->param.remote_cm_response_timeout = 20; | |
451 | req->param.local_cm_response_timeout = 20; | |
7bb312e4 | 452 | req->param.retry_count = target->tl_retry_count; |
aef9ec39 RD |
453 | req->param.rnr_retry_count = 7; |
454 | req->param.max_cm_retries = 15; | |
455 | ||
456 | req->priv.opcode = SRP_LOGIN_REQ; | |
457 | req->priv.tag = 0; | |
49248644 | 458 | req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len); |
aef9ec39 RD |
459 | req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
460 | SRP_BUF_FORMAT_INDIRECT); | |
0c0450db | 461 | /* |
3cd96564 | 462 | * In the published SRP specification (draft rev. 16a), the |
0c0450db R |
463 | * port identifier format is 8 bytes of ID extension followed |
464 | * by 8 bytes of GUID. Older drafts put the two halves in the | |
465 | * opposite order, so that the GUID comes first. | |
466 | * | |
467 | * Targets conforming to these obsolete drafts can be | |
468 | * recognized by the I/O Class they report. | |
469 | */ | |
470 | if (target->io_class == SRP_REV10_IB_IO_CLASS) { | |
471 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb | 472 | &target->path.sgid.global.interface_id, 8); |
0c0450db | 473 | memcpy(req->priv.initiator_port_id + 8, |
01cb9bcb | 474 | &target->initiator_ext, 8); |
0c0450db R |
475 | memcpy(req->priv.target_port_id, &target->ioc_guid, 8); |
476 | memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); | |
477 | } else { | |
478 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb IR |
479 | &target->initiator_ext, 8); |
480 | memcpy(req->priv.initiator_port_id + 8, | |
481 | &target->path.sgid.global.interface_id, 8); | |
0c0450db R |
482 | memcpy(req->priv.target_port_id, &target->id_ext, 8); |
483 | memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); | |
484 | } | |
485 | ||
aef9ec39 RD |
486 | /* |
487 | * Topspin/Cisco SRP targets will reject our login unless we | |
01cb9bcb IR |
488 | * zero out the first 8 bytes of our initiator port ID and set |
489 | * the second 8 bytes to the local node GUID. | |
aef9ec39 | 490 | */ |
5d7cbfd6 | 491 | if (srp_target_is_topspin(target)) { |
7aa54bd7 DD |
492 | shost_printk(KERN_DEBUG, target->scsi_host, |
493 | PFX "Topspin/Cisco initiator port ID workaround " | |
494 | "activated for target GUID %016llx\n", | |
495 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
aef9ec39 | 496 | memset(req->priv.initiator_port_id, 0, 8); |
01cb9bcb | 497 | memcpy(req->priv.initiator_port_id + 8, |
05321937 | 498 | &target->srp_host->srp_dev->dev->node_guid, 8); |
aef9ec39 | 499 | } |
aef9ec39 RD |
500 | |
501 | status = ib_send_cm_req(target->cm_id, &req->param); | |
502 | ||
503 | kfree(req); | |
504 | ||
505 | return status; | |
506 | } | |
507 | ||
ef6c49d8 BVA |
508 | static bool srp_queue_remove_work(struct srp_target_port *target) |
509 | { | |
510 | bool changed = false; | |
511 | ||
512 | spin_lock_irq(&target->lock); | |
513 | if (target->state != SRP_TARGET_REMOVED) { | |
514 | target->state = SRP_TARGET_REMOVED; | |
515 | changed = true; | |
516 | } | |
517 | spin_unlock_irq(&target->lock); | |
518 | ||
519 | if (changed) | |
520 | queue_work(system_long_wq, &target->remove_work); | |
521 | ||
522 | return changed; | |
523 | } | |
524 | ||
294c875a BVA |
525 | static bool srp_change_conn_state(struct srp_target_port *target, |
526 | bool connected) | |
527 | { | |
528 | bool changed = false; | |
529 | ||
530 | spin_lock_irq(&target->lock); | |
531 | if (target->connected != connected) { | |
532 | target->connected = connected; | |
533 | changed = true; | |
534 | } | |
535 | spin_unlock_irq(&target->lock); | |
536 | ||
537 | return changed; | |
538 | } | |
539 | ||
aef9ec39 RD |
540 | static void srp_disconnect_target(struct srp_target_port *target) |
541 | { | |
294c875a BVA |
542 | if (srp_change_conn_state(target, false)) { |
543 | /* XXX should send SRP_I_LOGOUT request */ | |
aef9ec39 | 544 | |
294c875a BVA |
545 | if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { |
546 | shost_printk(KERN_DEBUG, target->scsi_host, | |
547 | PFX "Sending CM DREQ failed\n"); | |
294c875a | 548 | } |
e6581056 | 549 | } |
aef9ec39 RD |
550 | } |
551 | ||
8f26c9ff DD |
552 | static void srp_free_req_data(struct srp_target_port *target) |
553 | { | |
c07d424d | 554 | struct ib_device *ibdev = target->srp_host->srp_dev->dev; |
8f26c9ff DD |
555 | struct srp_request *req; |
556 | int i; | |
557 | ||
558 | for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) { | |
559 | kfree(req->fmr_list); | |
560 | kfree(req->map_page); | |
c07d424d DD |
561 | if (req->indirect_dma_addr) { |
562 | ib_dma_unmap_single(ibdev, req->indirect_dma_addr, | |
563 | target->indirect_size, | |
564 | DMA_TO_DEVICE); | |
565 | } | |
566 | kfree(req->indirect_desc); | |
8f26c9ff DD |
567 | } |
568 | } | |
569 | ||
683b159a BVA |
570 | /** |
571 | * srp_del_scsi_host_attr() - Remove attributes defined in the host template. | |
572 | * @shost: SCSI host whose attributes to remove from sysfs. | |
573 | * | |
574 | * Note: Any attributes defined in the host template and that did not exist | |
575 | * before invocation of this function will be ignored. | |
576 | */ | |
577 | static void srp_del_scsi_host_attr(struct Scsi_Host *shost) | |
578 | { | |
579 | struct device_attribute **attr; | |
580 | ||
581 | for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr) | |
582 | device_remove_file(&shost->shost_dev, *attr); | |
583 | } | |
584 | ||
ee12d6a8 BVA |
585 | static void srp_remove_target(struct srp_target_port *target) |
586 | { | |
ef6c49d8 BVA |
587 | WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); |
588 | ||
ee12d6a8 | 589 | srp_del_scsi_host_attr(target->scsi_host); |
9dd69a60 | 590 | srp_rport_get(target->rport); |
ee12d6a8 BVA |
591 | srp_remove_host(target->scsi_host); |
592 | scsi_remove_host(target->scsi_host); | |
ef6c49d8 | 593 | srp_disconnect_target(target); |
ee12d6a8 BVA |
594 | ib_destroy_cm_id(target->cm_id); |
595 | srp_free_target_ib(target); | |
9dd69a60 | 596 | srp_rport_put(target->rport); |
ee12d6a8 BVA |
597 | srp_free_req_data(target); |
598 | scsi_host_put(target->scsi_host); | |
599 | } | |
600 | ||
c4028958 | 601 | static void srp_remove_work(struct work_struct *work) |
aef9ec39 | 602 | { |
c4028958 | 603 | struct srp_target_port *target = |
ef6c49d8 | 604 | container_of(work, struct srp_target_port, remove_work); |
aef9ec39 | 605 | |
ef6c49d8 | 606 | WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); |
aef9ec39 | 607 | |
96fc248a BVA |
608 | srp_remove_target(target); |
609 | ||
b3589fd4 | 610 | spin_lock(&target->srp_host->target_lock); |
aef9ec39 | 611 | list_del(&target->list); |
b3589fd4 | 612 | spin_unlock(&target->srp_host->target_lock); |
aef9ec39 RD |
613 | } |
614 | ||
dc1bdbd9 BVA |
615 | static void srp_rport_delete(struct srp_rport *rport) |
616 | { | |
617 | struct srp_target_port *target = rport->lld_data; | |
618 | ||
619 | srp_queue_remove_work(target); | |
620 | } | |
621 | ||
aef9ec39 RD |
622 | static int srp_connect_target(struct srp_target_port *target) |
623 | { | |
9fe4bcf4 | 624 | int retries = 3; |
aef9ec39 RD |
625 | int ret; |
626 | ||
294c875a BVA |
627 | WARN_ON_ONCE(target->connected); |
628 | ||
948d1e88 BVA |
629 | target->qp_in_error = false; |
630 | ||
aef9ec39 RD |
631 | ret = srp_lookup_path(target); |
632 | if (ret) | |
633 | return ret; | |
634 | ||
635 | while (1) { | |
636 | init_completion(&target->done); | |
637 | ret = srp_send_req(target); | |
638 | if (ret) | |
639 | return ret; | |
640 | wait_for_completion(&target->done); | |
641 | ||
642 | /* | |
643 | * The CM event handling code will set status to | |
644 | * SRP_PORT_REDIRECT if we get a port redirect REJ | |
645 | * back, or SRP_DLID_REDIRECT if we get a lid/qp | |
646 | * redirect REJ back. | |
647 | */ | |
648 | switch (target->status) { | |
649 | case 0: | |
294c875a | 650 | srp_change_conn_state(target, true); |
aef9ec39 RD |
651 | return 0; |
652 | ||
653 | case SRP_PORT_REDIRECT: | |
654 | ret = srp_lookup_path(target); | |
655 | if (ret) | |
656 | return ret; | |
657 | break; | |
658 | ||
659 | case SRP_DLID_REDIRECT: | |
660 | break; | |
661 | ||
9fe4bcf4 DD |
662 | case SRP_STALE_CONN: |
663 | /* Our current CM id was stale, and is now in timewait. | |
664 | * Try to reconnect with a new one. | |
665 | */ | |
666 | if (!retries-- || srp_new_cm_id(target)) { | |
667 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
668 | "giving up on stale connection\n"); | |
669 | target->status = -ECONNRESET; | |
670 | return target->status; | |
671 | } | |
672 | ||
673 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
674 | "retrying stale connection\n"); | |
675 | break; | |
676 | ||
aef9ec39 RD |
677 | default: |
678 | return target->status; | |
679 | } | |
680 | } | |
681 | } | |
682 | ||
d945e1df RD |
683 | static void srp_unmap_data(struct scsi_cmnd *scmnd, |
684 | struct srp_target_port *target, | |
685 | struct srp_request *req) | |
686 | { | |
8f26c9ff DD |
687 | struct ib_device *ibdev = target->srp_host->srp_dev->dev; |
688 | struct ib_pool_fmr **pfmr; | |
689 | ||
bb350d1d | 690 | if (!scsi_sglist(scmnd) || |
d945e1df RD |
691 | (scmnd->sc_data_direction != DMA_TO_DEVICE && |
692 | scmnd->sc_data_direction != DMA_FROM_DEVICE)) | |
693 | return; | |
694 | ||
8f26c9ff DD |
695 | pfmr = req->fmr_list; |
696 | while (req->nfmr--) | |
697 | ib_fmr_pool_unmap(*pfmr++); | |
f5358a17 | 698 | |
8f26c9ff DD |
699 | ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd), |
700 | scmnd->sc_data_direction); | |
d945e1df RD |
701 | } |
702 | ||
22032991 BVA |
703 | /** |
704 | * srp_claim_req - Take ownership of the scmnd associated with a request. | |
705 | * @target: SRP target port. | |
706 | * @req: SRP request. | |
707 | * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take | |
708 | * ownership of @req->scmnd if it equals @scmnd. | |
709 | * | |
710 | * Return value: | |
711 | * Either NULL or a pointer to the SCSI command the caller became owner of. | |
712 | */ | |
713 | static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target, | |
714 | struct srp_request *req, | |
715 | struct scsi_cmnd *scmnd) | |
716 | { | |
717 | unsigned long flags; | |
718 | ||
719 | spin_lock_irqsave(&target->lock, flags); | |
720 | if (!scmnd) { | |
721 | scmnd = req->scmnd; | |
722 | req->scmnd = NULL; | |
723 | } else if (req->scmnd == scmnd) { | |
724 | req->scmnd = NULL; | |
725 | } else { | |
726 | scmnd = NULL; | |
727 | } | |
728 | spin_unlock_irqrestore(&target->lock, flags); | |
729 | ||
730 | return scmnd; | |
731 | } | |
732 | ||
733 | /** | |
734 | * srp_free_req() - Unmap data and add request to the free request list. | |
735 | */ | |
736 | static void srp_free_req(struct srp_target_port *target, | |
737 | struct srp_request *req, struct scsi_cmnd *scmnd, | |
738 | s32 req_lim_delta) | |
526b4caa | 739 | { |
94a9174c BVA |
740 | unsigned long flags; |
741 | ||
22032991 BVA |
742 | srp_unmap_data(scmnd, target, req); |
743 | ||
e9684678 | 744 | spin_lock_irqsave(&target->lock, flags); |
94a9174c | 745 | target->req_lim += req_lim_delta; |
536ae14e | 746 | list_add_tail(&req->list, &target->free_reqs); |
e9684678 | 747 | spin_unlock_irqrestore(&target->lock, flags); |
526b4caa IR |
748 | } |
749 | ||
ed9b2264 BVA |
750 | static void srp_finish_req(struct srp_target_port *target, |
751 | struct srp_request *req, int result) | |
526b4caa | 752 | { |
22032991 BVA |
753 | struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL); |
754 | ||
755 | if (scmnd) { | |
9b796d06 | 756 | srp_free_req(target, req, scmnd, 0); |
ed9b2264 | 757 | scmnd->result = result; |
22032991 | 758 | scmnd->scsi_done(scmnd); |
22032991 | 759 | } |
526b4caa IR |
760 | } |
761 | ||
ed9b2264 | 762 | static void srp_terminate_io(struct srp_rport *rport) |
aef9ec39 | 763 | { |
ed9b2264 BVA |
764 | struct srp_target_port *target = rport->lld_data; |
765 | int i; | |
766 | ||
767 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { | |
768 | struct srp_request *req = &target->req_ring[i]; | |
769 | srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16); | |
770 | } | |
771 | } | |
aef9ec39 | 772 | |
ed9b2264 BVA |
773 | /* |
774 | * It is up to the caller to ensure that srp_rport_reconnect() calls are | |
775 | * serialized and that no concurrent srp_queuecommand(), srp_abort(), | |
776 | * srp_reset_device() or srp_reset_host() calls will occur while this function | |
777 | * is in progress. One way to realize that is not to call this function | |
778 | * directly but to call srp_reconnect_rport() instead since that last function | |
779 | * serializes calls of this function via rport->mutex and also blocks | |
780 | * srp_queuecommand() calls before invoking this function. | |
781 | */ | |
782 | static int srp_rport_reconnect(struct srp_rport *rport) | |
783 | { | |
784 | struct srp_target_port *target = rport->lld_data; | |
785 | int i, ret; | |
09be70a2 | 786 | |
aef9ec39 RD |
787 | srp_disconnect_target(target); |
788 | /* | |
c7c4e7ff BVA |
789 | * Now get a new local CM ID so that we avoid confusing the target in |
790 | * case things are really fouled up. Doing so also ensures that all CM | |
791 | * callbacks will have finished before a new QP is allocated. | |
aef9ec39 | 792 | */ |
9fe4bcf4 | 793 | ret = srp_new_cm_id(target); |
c7c4e7ff BVA |
794 | /* |
795 | * Whether or not creating a new CM ID succeeded, create a new | |
796 | * QP. This guarantees that all completion callback function | |
797 | * invocations have finished before request resetting starts. | |
798 | */ | |
799 | if (ret == 0) | |
800 | ret = srp_create_target_ib(target); | |
801 | else | |
802 | srp_create_target_ib(target); | |
aef9ec39 | 803 | |
536ae14e BVA |
804 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { |
805 | struct srp_request *req = &target->req_ring[i]; | |
ed9b2264 | 806 | srp_finish_req(target, req, DID_RESET << 16); |
536ae14e | 807 | } |
aef9ec39 | 808 | |
536ae14e | 809 | INIT_LIST_HEAD(&target->free_tx); |
dcb4cb85 | 810 | for (i = 0; i < SRP_SQ_SIZE; ++i) |
536ae14e | 811 | list_add(&target->tx_ring[i]->list, &target->free_tx); |
aef9ec39 | 812 | |
c7c4e7ff BVA |
813 | if (ret == 0) |
814 | ret = srp_connect_target(target); | |
09be70a2 | 815 | |
ed9b2264 BVA |
816 | if (ret == 0) |
817 | shost_printk(KERN_INFO, target->scsi_host, | |
818 | PFX "reconnect succeeded\n"); | |
aef9ec39 RD |
819 | |
820 | return ret; | |
821 | } | |
822 | ||
8f26c9ff DD |
823 | static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr, |
824 | unsigned int dma_len, u32 rkey) | |
f5358a17 | 825 | { |
8f26c9ff | 826 | struct srp_direct_buf *desc = state->desc; |
f5358a17 | 827 | |
8f26c9ff DD |
828 | desc->va = cpu_to_be64(dma_addr); |
829 | desc->key = cpu_to_be32(rkey); | |
830 | desc->len = cpu_to_be32(dma_len); | |
f5358a17 | 831 | |
8f26c9ff DD |
832 | state->total_len += dma_len; |
833 | state->desc++; | |
834 | state->ndesc++; | |
835 | } | |
559ce8f1 | 836 | |
8f26c9ff DD |
837 | static int srp_map_finish_fmr(struct srp_map_state *state, |
838 | struct srp_target_port *target) | |
839 | { | |
840 | struct srp_device *dev = target->srp_host->srp_dev; | |
841 | struct ib_pool_fmr *fmr; | |
842 | u64 io_addr = 0; | |
85507bcc | 843 | |
8f26c9ff DD |
844 | if (!state->npages) |
845 | return 0; | |
f5358a17 | 846 | |
8f26c9ff DD |
847 | if (state->npages == 1) { |
848 | srp_map_desc(state, state->base_dma_addr, state->fmr_len, | |
849 | target->rkey); | |
850 | state->npages = state->fmr_len = 0; | |
851 | return 0; | |
f5358a17 RD |
852 | } |
853 | ||
8f26c9ff DD |
854 | fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages, |
855 | state->npages, io_addr); | |
856 | if (IS_ERR(fmr)) | |
857 | return PTR_ERR(fmr); | |
f5358a17 | 858 | |
8f26c9ff DD |
859 | *state->next_fmr++ = fmr; |
860 | state->nfmr++; | |
f5358a17 | 861 | |
8f26c9ff DD |
862 | srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey); |
863 | state->npages = state->fmr_len = 0; | |
864 | return 0; | |
865 | } | |
866 | ||
867 | static void srp_map_update_start(struct srp_map_state *state, | |
868 | struct scatterlist *sg, int sg_index, | |
869 | dma_addr_t dma_addr) | |
870 | { | |
871 | state->unmapped_sg = sg; | |
872 | state->unmapped_index = sg_index; | |
873 | state->unmapped_addr = dma_addr; | |
874 | } | |
85507bcc | 875 | |
8f26c9ff DD |
876 | static int srp_map_sg_entry(struct srp_map_state *state, |
877 | struct srp_target_port *target, | |
878 | struct scatterlist *sg, int sg_index, | |
879 | int use_fmr) | |
880 | { | |
881 | struct srp_device *dev = target->srp_host->srp_dev; | |
882 | struct ib_device *ibdev = dev->dev; | |
883 | dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg); | |
884 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
885 | unsigned int len; | |
886 | int ret; | |
887 | ||
888 | if (!dma_len) | |
889 | return 0; | |
890 | ||
891 | if (use_fmr == SRP_MAP_NO_FMR) { | |
892 | /* Once we're in direct map mode for a request, we don't | |
893 | * go back to FMR mode, so no need to update anything | |
894 | * other than the descriptor. | |
895 | */ | |
896 | srp_map_desc(state, dma_addr, dma_len, target->rkey); | |
897 | return 0; | |
85507bcc | 898 | } |
f5358a17 | 899 | |
8f26c9ff DD |
900 | /* If we start at an offset into the FMR page, don't merge into |
901 | * the current FMR. Finish it out, and use the kernel's MR for this | |
902 | * sg entry. This is to avoid potential bugs on some SRP targets | |
903 | * that were never quite defined, but went away when the initiator | |
904 | * avoided using FMR on such page fragments. | |
905 | */ | |
906 | if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) { | |
907 | ret = srp_map_finish_fmr(state, target); | |
908 | if (ret) | |
909 | return ret; | |
910 | ||
911 | srp_map_desc(state, dma_addr, dma_len, target->rkey); | |
912 | srp_map_update_start(state, NULL, 0, 0); | |
913 | return 0; | |
f5358a17 RD |
914 | } |
915 | ||
8f26c9ff DD |
916 | /* If this is the first sg to go into the FMR, save our position. |
917 | * We need to know the first unmapped entry, its index, and the | |
918 | * first unmapped address within that entry to be able to restart | |
919 | * mapping after an error. | |
920 | */ | |
921 | if (!state->unmapped_sg) | |
922 | srp_map_update_start(state, sg, sg_index, dma_addr); | |
f5358a17 | 923 | |
8f26c9ff DD |
924 | while (dma_len) { |
925 | if (state->npages == SRP_FMR_SIZE) { | |
926 | ret = srp_map_finish_fmr(state, target); | |
927 | if (ret) | |
928 | return ret; | |
f5358a17 | 929 | |
8f26c9ff DD |
930 | srp_map_update_start(state, sg, sg_index, dma_addr); |
931 | } | |
932 | ||
933 | len = min_t(unsigned int, dma_len, dev->fmr_page_size); | |
f5358a17 | 934 | |
8f26c9ff DD |
935 | if (!state->npages) |
936 | state->base_dma_addr = dma_addr; | |
937 | state->pages[state->npages++] = dma_addr; | |
938 | state->fmr_len += len; | |
939 | dma_addr += len; | |
940 | dma_len -= len; | |
941 | } | |
942 | ||
943 | /* If the last entry of the FMR wasn't a full page, then we need to | |
944 | * close it out and start a new one -- we can only merge at page | |
945 | * boundries. | |
946 | */ | |
947 | ret = 0; | |
948 | if (len != dev->fmr_page_size) { | |
949 | ret = srp_map_finish_fmr(state, target); | |
950 | if (!ret) | |
951 | srp_map_update_start(state, NULL, 0, 0); | |
952 | } | |
f5358a17 RD |
953 | return ret; |
954 | } | |
955 | ||
aef9ec39 RD |
956 | static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, |
957 | struct srp_request *req) | |
958 | { | |
8f26c9ff | 959 | struct scatterlist *scat, *sg; |
aef9ec39 | 960 | struct srp_cmd *cmd = req->cmd->buf; |
8f26c9ff | 961 | int i, len, nents, count, use_fmr; |
85507bcc RC |
962 | struct srp_device *dev; |
963 | struct ib_device *ibdev; | |
8f26c9ff DD |
964 | struct srp_map_state state; |
965 | struct srp_indirect_buf *indirect_hdr; | |
8f26c9ff DD |
966 | u32 table_len; |
967 | u8 fmt; | |
aef9ec39 | 968 | |
bb350d1d | 969 | if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE) |
aef9ec39 RD |
970 | return sizeof (struct srp_cmd); |
971 | ||
972 | if (scmnd->sc_data_direction != DMA_FROM_DEVICE && | |
973 | scmnd->sc_data_direction != DMA_TO_DEVICE) { | |
7aa54bd7 DD |
974 | shost_printk(KERN_WARNING, target->scsi_host, |
975 | PFX "Unhandled data direction %d\n", | |
976 | scmnd->sc_data_direction); | |
aef9ec39 RD |
977 | return -EINVAL; |
978 | } | |
979 | ||
bb350d1d FT |
980 | nents = scsi_sg_count(scmnd); |
981 | scat = scsi_sglist(scmnd); | |
aef9ec39 | 982 | |
05321937 | 983 | dev = target->srp_host->srp_dev; |
85507bcc RC |
984 | ibdev = dev->dev; |
985 | ||
986 | count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); | |
8f26c9ff DD |
987 | if (unlikely(count == 0)) |
988 | return -EIO; | |
f5358a17 RD |
989 | |
990 | fmt = SRP_DATA_DESC_DIRECT; | |
991 | len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); | |
aef9ec39 | 992 | |
cf368713 | 993 | if (count == 1) { |
f5358a17 RD |
994 | /* |
995 | * The midlayer only generated a single gather/scatter | |
996 | * entry, or DMA mapping coalesced everything to a | |
997 | * single entry. So a direct descriptor along with | |
998 | * the DMA MR suffices. | |
999 | */ | |
cf368713 | 1000 | struct srp_direct_buf *buf = (void *) cmd->add_data; |
aef9ec39 | 1001 | |
85507bcc | 1002 | buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); |
9af76271 | 1003 | buf->key = cpu_to_be32(target->rkey); |
85507bcc | 1004 | buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); |
8f26c9ff DD |
1005 | |
1006 | req->nfmr = 0; | |
1007 | goto map_complete; | |
1008 | } | |
1009 | ||
1010 | /* We have more than one scatter/gather entry, so build our indirect | |
1011 | * descriptor table, trying to merge as many entries with FMR as we | |
1012 | * can. | |
1013 | */ | |
1014 | indirect_hdr = (void *) cmd->add_data; | |
1015 | ||
c07d424d DD |
1016 | ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr, |
1017 | target->indirect_size, DMA_TO_DEVICE); | |
1018 | ||
8f26c9ff | 1019 | memset(&state, 0, sizeof(state)); |
c07d424d | 1020 | state.desc = req->indirect_desc; |
8f26c9ff DD |
1021 | state.pages = req->map_page; |
1022 | state.next_fmr = req->fmr_list; | |
1023 | ||
1024 | use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR; | |
1025 | ||
1026 | for_each_sg(scat, sg, count, i) { | |
1027 | if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) { | |
1028 | /* FMR mapping failed, so backtrack to the first | |
1029 | * unmapped entry and continue on without using FMR. | |
1030 | */ | |
1031 | dma_addr_t dma_addr; | |
1032 | unsigned int dma_len; | |
1033 | ||
1034 | backtrack: | |
1035 | sg = state.unmapped_sg; | |
1036 | i = state.unmapped_index; | |
1037 | ||
1038 | dma_addr = ib_sg_dma_address(ibdev, sg); | |
1039 | dma_len = ib_sg_dma_len(ibdev, sg); | |
1040 | dma_len -= (state.unmapped_addr - dma_addr); | |
1041 | dma_addr = state.unmapped_addr; | |
1042 | use_fmr = SRP_MAP_NO_FMR; | |
1043 | srp_map_desc(&state, dma_addr, dma_len, target->rkey); | |
f5358a17 | 1044 | } |
8f26c9ff | 1045 | } |
aef9ec39 | 1046 | |
8f26c9ff DD |
1047 | if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target)) |
1048 | goto backtrack; | |
cf368713 | 1049 | |
c07d424d DD |
1050 | /* We've mapped the request, now pull as much of the indirect |
1051 | * descriptor table as we can into the command buffer. If this | |
1052 | * target is not using an external indirect table, we are | |
1053 | * guaranteed to fit into the command, as the SCSI layer won't | |
1054 | * give us more S/G entries than we allow. | |
8f26c9ff DD |
1055 | */ |
1056 | req->nfmr = state.nfmr; | |
1057 | if (state.ndesc == 1) { | |
1058 | /* FMR mapping was able to collapse this to one entry, | |
1059 | * so use a direct descriptor. | |
1060 | */ | |
1061 | struct srp_direct_buf *buf = (void *) cmd->add_data; | |
cf368713 | 1062 | |
c07d424d | 1063 | *buf = req->indirect_desc[0]; |
8f26c9ff | 1064 | goto map_complete; |
aef9ec39 RD |
1065 | } |
1066 | ||
c07d424d DD |
1067 | if (unlikely(target->cmd_sg_cnt < state.ndesc && |
1068 | !target->allow_ext_sg)) { | |
1069 | shost_printk(KERN_ERR, target->scsi_host, | |
1070 | "Could not fit S/G list into SRP_CMD\n"); | |
1071 | return -EIO; | |
1072 | } | |
1073 | ||
1074 | count = min(state.ndesc, target->cmd_sg_cnt); | |
8f26c9ff DD |
1075 | table_len = state.ndesc * sizeof (struct srp_direct_buf); |
1076 | ||
1077 | fmt = SRP_DATA_DESC_INDIRECT; | |
1078 | len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf); | |
c07d424d | 1079 | len += count * sizeof (struct srp_direct_buf); |
8f26c9ff | 1080 | |
c07d424d DD |
1081 | memcpy(indirect_hdr->desc_list, req->indirect_desc, |
1082 | count * sizeof (struct srp_direct_buf)); | |
8f26c9ff | 1083 | |
c07d424d | 1084 | indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr); |
8f26c9ff DD |
1085 | indirect_hdr->table_desc.key = cpu_to_be32(target->rkey); |
1086 | indirect_hdr->table_desc.len = cpu_to_be32(table_len); | |
1087 | indirect_hdr->len = cpu_to_be32(state.total_len); | |
1088 | ||
1089 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) | |
c07d424d | 1090 | cmd->data_out_desc_cnt = count; |
8f26c9ff | 1091 | else |
c07d424d DD |
1092 | cmd->data_in_desc_cnt = count; |
1093 | ||
1094 | ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len, | |
1095 | DMA_TO_DEVICE); | |
8f26c9ff DD |
1096 | |
1097 | map_complete: | |
aef9ec39 RD |
1098 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) |
1099 | cmd->buf_fmt = fmt << 4; | |
1100 | else | |
1101 | cmd->buf_fmt = fmt; | |
1102 | ||
aef9ec39 RD |
1103 | return len; |
1104 | } | |
1105 | ||
76c75b25 BVA |
1106 | /* |
1107 | * Return an IU and possible credit to the free pool | |
1108 | */ | |
1109 | static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu, | |
1110 | enum srp_iu_type iu_type) | |
1111 | { | |
1112 | unsigned long flags; | |
1113 | ||
e9684678 | 1114 | spin_lock_irqsave(&target->lock, flags); |
76c75b25 BVA |
1115 | list_add(&iu->list, &target->free_tx); |
1116 | if (iu_type != SRP_IU_RSP) | |
1117 | ++target->req_lim; | |
e9684678 | 1118 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 BVA |
1119 | } |
1120 | ||
05a1d750 | 1121 | /* |
e9684678 BVA |
1122 | * Must be called with target->lock held to protect req_lim and free_tx. |
1123 | * If IU is not sent, it must be returned using srp_put_tx_iu(). | |
05a1d750 DD |
1124 | * |
1125 | * Note: | |
1126 | * An upper limit for the number of allocated information units for each | |
1127 | * request type is: | |
1128 | * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues | |
1129 | * more than Scsi_Host.can_queue requests. | |
1130 | * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE. | |
1131 | * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than | |
1132 | * one unanswered SRP request to an initiator. | |
1133 | */ | |
1134 | static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target, | |
1135 | enum srp_iu_type iu_type) | |
1136 | { | |
1137 | s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE; | |
1138 | struct srp_iu *iu; | |
1139 | ||
1140 | srp_send_completion(target->send_cq, target); | |
1141 | ||
dcb4cb85 | 1142 | if (list_empty(&target->free_tx)) |
05a1d750 DD |
1143 | return NULL; |
1144 | ||
1145 | /* Initiator responses to target requests do not consume credits */ | |
76c75b25 BVA |
1146 | if (iu_type != SRP_IU_RSP) { |
1147 | if (target->req_lim <= rsv) { | |
1148 | ++target->zero_req_lim; | |
1149 | return NULL; | |
1150 | } | |
1151 | ||
1152 | --target->req_lim; | |
05a1d750 DD |
1153 | } |
1154 | ||
dcb4cb85 | 1155 | iu = list_first_entry(&target->free_tx, struct srp_iu, list); |
76c75b25 | 1156 | list_del(&iu->list); |
05a1d750 DD |
1157 | return iu; |
1158 | } | |
1159 | ||
76c75b25 BVA |
1160 | static int srp_post_send(struct srp_target_port *target, |
1161 | struct srp_iu *iu, int len) | |
05a1d750 DD |
1162 | { |
1163 | struct ib_sge list; | |
1164 | struct ib_send_wr wr, *bad_wr; | |
05a1d750 DD |
1165 | |
1166 | list.addr = iu->dma; | |
1167 | list.length = len; | |
9af76271 | 1168 | list.lkey = target->lkey; |
05a1d750 DD |
1169 | |
1170 | wr.next = NULL; | |
dcb4cb85 | 1171 | wr.wr_id = (uintptr_t) iu; |
05a1d750 DD |
1172 | wr.sg_list = &list; |
1173 | wr.num_sge = 1; | |
1174 | wr.opcode = IB_WR_SEND; | |
1175 | wr.send_flags = IB_SEND_SIGNALED; | |
1176 | ||
76c75b25 | 1177 | return ib_post_send(target->qp, &wr, &bad_wr); |
05a1d750 DD |
1178 | } |
1179 | ||
dcb4cb85 | 1180 | static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu) |
c996bb47 | 1181 | { |
c996bb47 | 1182 | struct ib_recv_wr wr, *bad_wr; |
dcb4cb85 | 1183 | struct ib_sge list; |
c996bb47 BVA |
1184 | |
1185 | list.addr = iu->dma; | |
1186 | list.length = iu->size; | |
9af76271 | 1187 | list.lkey = target->lkey; |
c996bb47 BVA |
1188 | |
1189 | wr.next = NULL; | |
dcb4cb85 | 1190 | wr.wr_id = (uintptr_t) iu; |
c996bb47 BVA |
1191 | wr.sg_list = &list; |
1192 | wr.num_sge = 1; | |
1193 | ||
dcb4cb85 | 1194 | return ib_post_recv(target->qp, &wr, &bad_wr); |
c996bb47 BVA |
1195 | } |
1196 | ||
aef9ec39 RD |
1197 | static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) |
1198 | { | |
1199 | struct srp_request *req; | |
1200 | struct scsi_cmnd *scmnd; | |
1201 | unsigned long flags; | |
aef9ec39 | 1202 | |
aef9ec39 | 1203 | if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { |
e9684678 | 1204 | spin_lock_irqsave(&target->lock, flags); |
94a9174c | 1205 | target->req_lim += be32_to_cpu(rsp->req_lim_delta); |
e9684678 | 1206 | spin_unlock_irqrestore(&target->lock, flags); |
94a9174c | 1207 | |
f8b6e31e DD |
1208 | target->tsk_mgmt_status = -1; |
1209 | if (be32_to_cpu(rsp->resp_data_len) >= 4) | |
1210 | target->tsk_mgmt_status = rsp->data[3]; | |
1211 | complete(&target->tsk_mgmt_done); | |
aef9ec39 | 1212 | } else { |
f8b6e31e | 1213 | req = &target->req_ring[rsp->tag]; |
22032991 BVA |
1214 | scmnd = srp_claim_req(target, req, NULL); |
1215 | if (!scmnd) { | |
7aa54bd7 DD |
1216 | shost_printk(KERN_ERR, target->scsi_host, |
1217 | "Null scmnd for RSP w/tag %016llx\n", | |
1218 | (unsigned long long) rsp->tag); | |
22032991 BVA |
1219 | |
1220 | spin_lock_irqsave(&target->lock, flags); | |
1221 | target->req_lim += be32_to_cpu(rsp->req_lim_delta); | |
1222 | spin_unlock_irqrestore(&target->lock, flags); | |
1223 | ||
1224 | return; | |
1225 | } | |
aef9ec39 RD |
1226 | scmnd->result = rsp->status; |
1227 | ||
1228 | if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { | |
1229 | memcpy(scmnd->sense_buffer, rsp->data + | |
1230 | be32_to_cpu(rsp->resp_data_len), | |
1231 | min_t(int, be32_to_cpu(rsp->sense_data_len), | |
1232 | SCSI_SENSE_BUFFERSIZE)); | |
1233 | } | |
1234 | ||
1235 | if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) | |
bb350d1d | 1236 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); |
aef9ec39 | 1237 | else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) |
bb350d1d | 1238 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
aef9ec39 | 1239 | |
22032991 BVA |
1240 | srp_free_req(target, req, scmnd, |
1241 | be32_to_cpu(rsp->req_lim_delta)); | |
1242 | ||
f8b6e31e DD |
1243 | scmnd->host_scribble = NULL; |
1244 | scmnd->scsi_done(scmnd); | |
aef9ec39 | 1245 | } |
aef9ec39 RD |
1246 | } |
1247 | ||
bb12588a DD |
1248 | static int srp_response_common(struct srp_target_port *target, s32 req_delta, |
1249 | void *rsp, int len) | |
1250 | { | |
76c75b25 | 1251 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
bb12588a DD |
1252 | unsigned long flags; |
1253 | struct srp_iu *iu; | |
76c75b25 | 1254 | int err; |
bb12588a | 1255 | |
e9684678 | 1256 | spin_lock_irqsave(&target->lock, flags); |
bb12588a | 1257 | target->req_lim += req_delta; |
bb12588a | 1258 | iu = __srp_get_tx_iu(target, SRP_IU_RSP); |
e9684678 | 1259 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 | 1260 | |
bb12588a DD |
1261 | if (!iu) { |
1262 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1263 | "no IU available to send response\n"); | |
76c75b25 | 1264 | return 1; |
bb12588a DD |
1265 | } |
1266 | ||
1267 | ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE); | |
1268 | memcpy(iu->buf, rsp, len); | |
1269 | ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE); | |
1270 | ||
76c75b25 BVA |
1271 | err = srp_post_send(target, iu, len); |
1272 | if (err) { | |
bb12588a DD |
1273 | shost_printk(KERN_ERR, target->scsi_host, PFX |
1274 | "unable to post response: %d\n", err); | |
76c75b25 BVA |
1275 | srp_put_tx_iu(target, iu, SRP_IU_RSP); |
1276 | } | |
bb12588a | 1277 | |
bb12588a DD |
1278 | return err; |
1279 | } | |
1280 | ||
1281 | static void srp_process_cred_req(struct srp_target_port *target, | |
1282 | struct srp_cred_req *req) | |
1283 | { | |
1284 | struct srp_cred_rsp rsp = { | |
1285 | .opcode = SRP_CRED_RSP, | |
1286 | .tag = req->tag, | |
1287 | }; | |
1288 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
1289 | ||
1290 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1291 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1292 | "problems processing SRP_CRED_REQ\n"); | |
1293 | } | |
1294 | ||
1295 | static void srp_process_aer_req(struct srp_target_port *target, | |
1296 | struct srp_aer_req *req) | |
1297 | { | |
1298 | struct srp_aer_rsp rsp = { | |
1299 | .opcode = SRP_AER_RSP, | |
1300 | .tag = req->tag, | |
1301 | }; | |
1302 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
1303 | ||
1304 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1305 | "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun)); | |
1306 | ||
1307 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1308 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1309 | "problems processing SRP_AER_REQ\n"); | |
1310 | } | |
1311 | ||
aef9ec39 RD |
1312 | static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) |
1313 | { | |
dcb4cb85 | 1314 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
737b94eb | 1315 | struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id; |
c996bb47 | 1316 | int res; |
aef9ec39 RD |
1317 | u8 opcode; |
1318 | ||
85507bcc RC |
1319 | ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, |
1320 | DMA_FROM_DEVICE); | |
aef9ec39 RD |
1321 | |
1322 | opcode = *(u8 *) iu->buf; | |
1323 | ||
1324 | if (0) { | |
7aa54bd7 DD |
1325 | shost_printk(KERN_ERR, target->scsi_host, |
1326 | PFX "recv completion, opcode 0x%02x\n", opcode); | |
7a700811 BVA |
1327 | print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1, |
1328 | iu->buf, wc->byte_len, true); | |
aef9ec39 RD |
1329 | } |
1330 | ||
1331 | switch (opcode) { | |
1332 | case SRP_RSP: | |
1333 | srp_process_rsp(target, iu->buf); | |
1334 | break; | |
1335 | ||
bb12588a DD |
1336 | case SRP_CRED_REQ: |
1337 | srp_process_cred_req(target, iu->buf); | |
1338 | break; | |
1339 | ||
1340 | case SRP_AER_REQ: | |
1341 | srp_process_aer_req(target, iu->buf); | |
1342 | break; | |
1343 | ||
aef9ec39 RD |
1344 | case SRP_T_LOGOUT: |
1345 | /* XXX Handle target logout */ | |
7aa54bd7 DD |
1346 | shost_printk(KERN_WARNING, target->scsi_host, |
1347 | PFX "Got target logout request\n"); | |
aef9ec39 RD |
1348 | break; |
1349 | ||
1350 | default: | |
7aa54bd7 DD |
1351 | shost_printk(KERN_WARNING, target->scsi_host, |
1352 | PFX "Unhandled SRP opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1353 | break; |
1354 | } | |
1355 | ||
85507bcc RC |
1356 | ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, |
1357 | DMA_FROM_DEVICE); | |
c996bb47 | 1358 | |
dcb4cb85 | 1359 | res = srp_post_recv(target, iu); |
c996bb47 BVA |
1360 | if (res != 0) |
1361 | shost_printk(KERN_ERR, target->scsi_host, | |
1362 | PFX "Recv failed with error code %d\n", res); | |
aef9ec39 RD |
1363 | } |
1364 | ||
948d1e88 BVA |
1365 | static void srp_handle_qp_err(enum ib_wc_status wc_status, |
1366 | enum ib_wc_opcode wc_opcode, | |
1367 | struct srp_target_port *target) | |
1368 | { | |
294c875a | 1369 | if (target->connected && !target->qp_in_error) { |
4f0af697 BVA |
1370 | shost_printk(KERN_ERR, target->scsi_host, |
1371 | PFX "failed %s status %d\n", | |
1372 | wc_opcode & IB_WC_RECV ? "receive" : "send", | |
1373 | wc_status); | |
1374 | } | |
948d1e88 BVA |
1375 | target->qp_in_error = true; |
1376 | } | |
1377 | ||
9c03dc9f | 1378 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr) |
aef9ec39 RD |
1379 | { |
1380 | struct srp_target_port *target = target_ptr; | |
1381 | struct ib_wc wc; | |
aef9ec39 RD |
1382 | |
1383 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
1384 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
948d1e88 BVA |
1385 | if (likely(wc.status == IB_WC_SUCCESS)) { |
1386 | srp_handle_recv(target, &wc); | |
1387 | } else { | |
1388 | srp_handle_qp_err(wc.status, wc.opcode, target); | |
aef9ec39 | 1389 | } |
9c03dc9f BVA |
1390 | } |
1391 | } | |
1392 | ||
1393 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr) | |
1394 | { | |
1395 | struct srp_target_port *target = target_ptr; | |
1396 | struct ib_wc wc; | |
dcb4cb85 | 1397 | struct srp_iu *iu; |
9c03dc9f BVA |
1398 | |
1399 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
948d1e88 BVA |
1400 | if (likely(wc.status == IB_WC_SUCCESS)) { |
1401 | iu = (struct srp_iu *) (uintptr_t) wc.wr_id; | |
1402 | list_add(&iu->list, &target->free_tx); | |
1403 | } else { | |
1404 | srp_handle_qp_err(wc.status, wc.opcode, target); | |
9c03dc9f | 1405 | } |
aef9ec39 RD |
1406 | } |
1407 | } | |
1408 | ||
76c75b25 | 1409 | static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd) |
aef9ec39 | 1410 | { |
76c75b25 | 1411 | struct srp_target_port *target = host_to_target(shost); |
aef9ec39 RD |
1412 | struct srp_request *req; |
1413 | struct srp_iu *iu; | |
1414 | struct srp_cmd *cmd; | |
85507bcc | 1415 | struct ib_device *dev; |
76c75b25 | 1416 | unsigned long flags; |
ed9b2264 | 1417 | int len, result; |
aef9ec39 | 1418 | |
ed9b2264 BVA |
1419 | result = srp_chkready(target->rport); |
1420 | if (unlikely(result)) { | |
1421 | scmnd->result = result; | |
2ce19e72 BVA |
1422 | scmnd->scsi_done(scmnd); |
1423 | return 0; | |
1424 | } | |
1425 | ||
e9684678 | 1426 | spin_lock_irqsave(&target->lock, flags); |
bb12588a | 1427 | iu = __srp_get_tx_iu(target, SRP_IU_CMD); |
aef9ec39 | 1428 | if (!iu) |
695b8349 BVA |
1429 | goto err_unlock; |
1430 | ||
1431 | req = list_first_entry(&target->free_reqs, struct srp_request, list); | |
1432 | list_del(&req->list); | |
1433 | spin_unlock_irqrestore(&target->lock, flags); | |
aef9ec39 | 1434 | |
05321937 | 1435 | dev = target->srp_host->srp_dev->dev; |
49248644 | 1436 | ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len, |
85507bcc | 1437 | DMA_TO_DEVICE); |
aef9ec39 | 1438 | |
aef9ec39 | 1439 | scmnd->result = 0; |
f8b6e31e | 1440 | scmnd->host_scribble = (void *) req; |
aef9ec39 RD |
1441 | |
1442 | cmd = iu->buf; | |
1443 | memset(cmd, 0, sizeof *cmd); | |
1444 | ||
1445 | cmd->opcode = SRP_CMD; | |
1446 | cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); | |
d945e1df | 1447 | cmd->tag = req->index; |
aef9ec39 RD |
1448 | memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); |
1449 | ||
aef9ec39 RD |
1450 | req->scmnd = scmnd; |
1451 | req->cmd = iu; | |
aef9ec39 RD |
1452 | |
1453 | len = srp_map_data(scmnd, target, req); | |
1454 | if (len < 0) { | |
7aa54bd7 DD |
1455 | shost_printk(KERN_ERR, target->scsi_host, |
1456 | PFX "Failed to map data\n"); | |
76c75b25 | 1457 | goto err_iu; |
aef9ec39 RD |
1458 | } |
1459 | ||
49248644 | 1460 | ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len, |
85507bcc | 1461 | DMA_TO_DEVICE); |
aef9ec39 | 1462 | |
76c75b25 | 1463 | if (srp_post_send(target, iu, len)) { |
7aa54bd7 | 1464 | shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n"); |
aef9ec39 RD |
1465 | goto err_unmap; |
1466 | } | |
1467 | ||
aef9ec39 RD |
1468 | return 0; |
1469 | ||
1470 | err_unmap: | |
1471 | srp_unmap_data(scmnd, target, req); | |
1472 | ||
76c75b25 BVA |
1473 | err_iu: |
1474 | srp_put_tx_iu(target, iu, SRP_IU_CMD); | |
1475 | ||
e9684678 | 1476 | spin_lock_irqsave(&target->lock, flags); |
76c75b25 | 1477 | list_add(&req->list, &target->free_reqs); |
695b8349 BVA |
1478 | |
1479 | err_unlock: | |
e9684678 | 1480 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 | 1481 | |
aef9ec39 RD |
1482 | return SCSI_MLQUEUE_HOST_BUSY; |
1483 | } | |
1484 | ||
1485 | static int srp_alloc_iu_bufs(struct srp_target_port *target) | |
1486 | { | |
1487 | int i; | |
1488 | ||
1489 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1490 | target->rx_ring[i] = srp_alloc_iu(target->srp_host, | |
1491 | target->max_ti_iu_len, | |
1492 | GFP_KERNEL, DMA_FROM_DEVICE); | |
1493 | if (!target->rx_ring[i]) | |
1494 | goto err; | |
1495 | } | |
1496 | ||
dd5e6e38 | 1497 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
aef9ec39 | 1498 | target->tx_ring[i] = srp_alloc_iu(target->srp_host, |
49248644 | 1499 | target->max_iu_len, |
aef9ec39 RD |
1500 | GFP_KERNEL, DMA_TO_DEVICE); |
1501 | if (!target->tx_ring[i]) | |
1502 | goto err; | |
dcb4cb85 BVA |
1503 | |
1504 | list_add(&target->tx_ring[i]->list, &target->free_tx); | |
aef9ec39 RD |
1505 | } |
1506 | ||
1507 | return 0; | |
1508 | ||
1509 | err: | |
1510 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1511 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
1512 | target->rx_ring[i] = NULL; | |
1513 | } | |
1514 | ||
dd5e6e38 | 1515 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
aef9ec39 RD |
1516 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
1517 | target->tx_ring[i] = NULL; | |
1518 | } | |
1519 | ||
1520 | return -ENOMEM; | |
1521 | } | |
1522 | ||
c9b03c1a BVA |
1523 | static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask) |
1524 | { | |
1525 | uint64_t T_tr_ns, max_compl_time_ms; | |
1526 | uint32_t rq_tmo_jiffies; | |
1527 | ||
1528 | /* | |
1529 | * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair, | |
1530 | * table 91), both the QP timeout and the retry count have to be set | |
1531 | * for RC QP's during the RTR to RTS transition. | |
1532 | */ | |
1533 | WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) != | |
1534 | (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)); | |
1535 | ||
1536 | /* | |
1537 | * Set target->rq_tmo_jiffies to one second more than the largest time | |
1538 | * it can take before an error completion is generated. See also | |
1539 | * C9-140..142 in the IBTA spec for more information about how to | |
1540 | * convert the QP Local ACK Timeout value to nanoseconds. | |
1541 | */ | |
1542 | T_tr_ns = 4096 * (1ULL << qp_attr->timeout); | |
1543 | max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns; | |
1544 | do_div(max_compl_time_ms, NSEC_PER_MSEC); | |
1545 | rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000); | |
1546 | ||
1547 | return rq_tmo_jiffies; | |
1548 | } | |
1549 | ||
961e0be8 DD |
1550 | static void srp_cm_rep_handler(struct ib_cm_id *cm_id, |
1551 | struct srp_login_rsp *lrsp, | |
1552 | struct srp_target_port *target) | |
1553 | { | |
1554 | struct ib_qp_attr *qp_attr = NULL; | |
1555 | int attr_mask = 0; | |
1556 | int ret; | |
1557 | int i; | |
1558 | ||
1559 | if (lrsp->opcode == SRP_LOGIN_RSP) { | |
1560 | target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len); | |
1561 | target->req_lim = be32_to_cpu(lrsp->req_lim_delta); | |
1562 | ||
1563 | /* | |
1564 | * Reserve credits for task management so we don't | |
1565 | * bounce requests back to the SCSI mid-layer. | |
1566 | */ | |
1567 | target->scsi_host->can_queue | |
1568 | = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE, | |
1569 | target->scsi_host->can_queue); | |
1570 | } else { | |
1571 | shost_printk(KERN_WARNING, target->scsi_host, | |
1572 | PFX "Unhandled RSP opcode %#x\n", lrsp->opcode); | |
1573 | ret = -ECONNRESET; | |
1574 | goto error; | |
1575 | } | |
1576 | ||
1577 | if (!target->rx_ring[0]) { | |
1578 | ret = srp_alloc_iu_bufs(target); | |
1579 | if (ret) | |
1580 | goto error; | |
1581 | } | |
1582 | ||
1583 | ret = -ENOMEM; | |
1584 | qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); | |
1585 | if (!qp_attr) | |
1586 | goto error; | |
1587 | ||
1588 | qp_attr->qp_state = IB_QPS_RTR; | |
1589 | ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1590 | if (ret) | |
1591 | goto error_free; | |
1592 | ||
1593 | ret = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1594 | if (ret) | |
1595 | goto error_free; | |
1596 | ||
1597 | for (i = 0; i < SRP_RQ_SIZE; i++) { | |
1598 | struct srp_iu *iu = target->rx_ring[i]; | |
1599 | ret = srp_post_recv(target, iu); | |
1600 | if (ret) | |
1601 | goto error_free; | |
1602 | } | |
1603 | ||
1604 | qp_attr->qp_state = IB_QPS_RTS; | |
1605 | ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1606 | if (ret) | |
1607 | goto error_free; | |
1608 | ||
c9b03c1a BVA |
1609 | target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask); |
1610 | ||
961e0be8 DD |
1611 | ret = ib_modify_qp(target->qp, qp_attr, attr_mask); |
1612 | if (ret) | |
1613 | goto error_free; | |
1614 | ||
1615 | ret = ib_send_cm_rtu(cm_id, NULL, 0); | |
1616 | ||
1617 | error_free: | |
1618 | kfree(qp_attr); | |
1619 | ||
1620 | error: | |
1621 | target->status = ret; | |
1622 | } | |
1623 | ||
aef9ec39 RD |
1624 | static void srp_cm_rej_handler(struct ib_cm_id *cm_id, |
1625 | struct ib_cm_event *event, | |
1626 | struct srp_target_port *target) | |
1627 | { | |
7aa54bd7 | 1628 | struct Scsi_Host *shost = target->scsi_host; |
aef9ec39 RD |
1629 | struct ib_class_port_info *cpi; |
1630 | int opcode; | |
1631 | ||
1632 | switch (event->param.rej_rcvd.reason) { | |
1633 | case IB_CM_REJ_PORT_CM_REDIRECT: | |
1634 | cpi = event->param.rej_rcvd.ari; | |
1635 | target->path.dlid = cpi->redirect_lid; | |
1636 | target->path.pkey = cpi->redirect_pkey; | |
1637 | cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; | |
1638 | memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); | |
1639 | ||
1640 | target->status = target->path.dlid ? | |
1641 | SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; | |
1642 | break; | |
1643 | ||
1644 | case IB_CM_REJ_PORT_REDIRECT: | |
5d7cbfd6 | 1645 | if (srp_target_is_topspin(target)) { |
aef9ec39 RD |
1646 | /* |
1647 | * Topspin/Cisco SRP gateways incorrectly send | |
1648 | * reject reason code 25 when they mean 24 | |
1649 | * (port redirect). | |
1650 | */ | |
1651 | memcpy(target->path.dgid.raw, | |
1652 | event->param.rej_rcvd.ari, 16); | |
1653 | ||
7aa54bd7 DD |
1654 | shost_printk(KERN_DEBUG, shost, |
1655 | PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", | |
1656 | (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), | |
1657 | (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); | |
aef9ec39 RD |
1658 | |
1659 | target->status = SRP_PORT_REDIRECT; | |
1660 | } else { | |
7aa54bd7 DD |
1661 | shost_printk(KERN_WARNING, shost, |
1662 | " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); | |
aef9ec39 RD |
1663 | target->status = -ECONNRESET; |
1664 | } | |
1665 | break; | |
1666 | ||
1667 | case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: | |
7aa54bd7 DD |
1668 | shost_printk(KERN_WARNING, shost, |
1669 | " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); | |
aef9ec39 RD |
1670 | target->status = -ECONNRESET; |
1671 | break; | |
1672 | ||
1673 | case IB_CM_REJ_CONSUMER_DEFINED: | |
1674 | opcode = *(u8 *) event->private_data; | |
1675 | if (opcode == SRP_LOGIN_REJ) { | |
1676 | struct srp_login_rej *rej = event->private_data; | |
1677 | u32 reason = be32_to_cpu(rej->reason); | |
1678 | ||
1679 | if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) | |
7aa54bd7 DD |
1680 | shost_printk(KERN_WARNING, shost, |
1681 | PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); | |
aef9ec39 | 1682 | else |
7aa54bd7 DD |
1683 | shost_printk(KERN_WARNING, shost, |
1684 | PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason); | |
aef9ec39 | 1685 | } else |
7aa54bd7 DD |
1686 | shost_printk(KERN_WARNING, shost, |
1687 | " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," | |
1688 | " opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1689 | target->status = -ECONNRESET; |
1690 | break; | |
1691 | ||
9fe4bcf4 DD |
1692 | case IB_CM_REJ_STALE_CONN: |
1693 | shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n"); | |
1694 | target->status = SRP_STALE_CONN; | |
1695 | break; | |
1696 | ||
aef9ec39 | 1697 | default: |
7aa54bd7 DD |
1698 | shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n", |
1699 | event->param.rej_rcvd.reason); | |
aef9ec39 RD |
1700 | target->status = -ECONNRESET; |
1701 | } | |
1702 | } | |
1703 | ||
1704 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
1705 | { | |
1706 | struct srp_target_port *target = cm_id->context; | |
aef9ec39 | 1707 | int comp = 0; |
aef9ec39 RD |
1708 | |
1709 | switch (event->event) { | |
1710 | case IB_CM_REQ_ERROR: | |
7aa54bd7 DD |
1711 | shost_printk(KERN_DEBUG, target->scsi_host, |
1712 | PFX "Sending CM REQ failed\n"); | |
aef9ec39 RD |
1713 | comp = 1; |
1714 | target->status = -ECONNRESET; | |
1715 | break; | |
1716 | ||
1717 | case IB_CM_REP_RECEIVED: | |
1718 | comp = 1; | |
961e0be8 | 1719 | srp_cm_rep_handler(cm_id, event->private_data, target); |
aef9ec39 RD |
1720 | break; |
1721 | ||
1722 | case IB_CM_REJ_RECEIVED: | |
7aa54bd7 | 1723 | shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n"); |
aef9ec39 RD |
1724 | comp = 1; |
1725 | ||
1726 | srp_cm_rej_handler(cm_id, event, target); | |
1727 | break; | |
1728 | ||
b7ac4ab4 | 1729 | case IB_CM_DREQ_RECEIVED: |
7aa54bd7 DD |
1730 | shost_printk(KERN_WARNING, target->scsi_host, |
1731 | PFX "DREQ received - connection closed\n"); | |
294c875a | 1732 | srp_change_conn_state(target, false); |
b7ac4ab4 | 1733 | if (ib_send_cm_drep(cm_id, NULL, 0)) |
7aa54bd7 DD |
1734 | shost_printk(KERN_ERR, target->scsi_host, |
1735 | PFX "Sending CM DREP failed\n"); | |
aef9ec39 RD |
1736 | break; |
1737 | ||
1738 | case IB_CM_TIMEWAIT_EXIT: | |
7aa54bd7 DD |
1739 | shost_printk(KERN_ERR, target->scsi_host, |
1740 | PFX "connection closed\n"); | |
aef9ec39 | 1741 | |
aef9ec39 RD |
1742 | target->status = 0; |
1743 | break; | |
1744 | ||
b7ac4ab4 IR |
1745 | case IB_CM_MRA_RECEIVED: |
1746 | case IB_CM_DREQ_ERROR: | |
1747 | case IB_CM_DREP_RECEIVED: | |
1748 | break; | |
1749 | ||
aef9ec39 | 1750 | default: |
7aa54bd7 DD |
1751 | shost_printk(KERN_WARNING, target->scsi_host, |
1752 | PFX "Unhandled CM event %d\n", event->event); | |
aef9ec39 RD |
1753 | break; |
1754 | } | |
1755 | ||
1756 | if (comp) | |
1757 | complete(&target->done); | |
1758 | ||
aef9ec39 RD |
1759 | return 0; |
1760 | } | |
1761 | ||
d945e1df | 1762 | static int srp_send_tsk_mgmt(struct srp_target_port *target, |
f8b6e31e | 1763 | u64 req_tag, unsigned int lun, u8 func) |
aef9ec39 | 1764 | { |
19081f31 | 1765 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
aef9ec39 RD |
1766 | struct srp_iu *iu; |
1767 | struct srp_tsk_mgmt *tsk_mgmt; | |
aef9ec39 | 1768 | |
3780d1f0 BVA |
1769 | if (!target->connected || target->qp_in_error) |
1770 | return -1; | |
1771 | ||
f8b6e31e | 1772 | init_completion(&target->tsk_mgmt_done); |
aef9ec39 | 1773 | |
e9684678 | 1774 | spin_lock_irq(&target->lock); |
bb12588a | 1775 | iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT); |
e9684678 | 1776 | spin_unlock_irq(&target->lock); |
76c75b25 | 1777 | |
aef9ec39 | 1778 | if (!iu) |
76c75b25 | 1779 | return -1; |
aef9ec39 | 1780 | |
19081f31 DD |
1781 | ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt, |
1782 | DMA_TO_DEVICE); | |
aef9ec39 RD |
1783 | tsk_mgmt = iu->buf; |
1784 | memset(tsk_mgmt, 0, sizeof *tsk_mgmt); | |
1785 | ||
1786 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
f8b6e31e DD |
1787 | tsk_mgmt->lun = cpu_to_be64((u64) lun << 48); |
1788 | tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT; | |
aef9ec39 | 1789 | tsk_mgmt->tsk_mgmt_func = func; |
f8b6e31e | 1790 | tsk_mgmt->task_tag = req_tag; |
aef9ec39 | 1791 | |
19081f31 DD |
1792 | ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt, |
1793 | DMA_TO_DEVICE); | |
76c75b25 BVA |
1794 | if (srp_post_send(target, iu, sizeof *tsk_mgmt)) { |
1795 | srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT); | |
1796 | return -1; | |
1797 | } | |
d945e1df | 1798 | |
f8b6e31e | 1799 | if (!wait_for_completion_timeout(&target->tsk_mgmt_done, |
aef9ec39 | 1800 | msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) |
d945e1df | 1801 | return -1; |
aef9ec39 | 1802 | |
d945e1df | 1803 | return 0; |
d945e1df RD |
1804 | } |
1805 | ||
aef9ec39 RD |
1806 | static int srp_abort(struct scsi_cmnd *scmnd) |
1807 | { | |
d945e1df | 1808 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
f8b6e31e | 1809 | struct srp_request *req = (struct srp_request *) scmnd->host_scribble; |
086f44f5 | 1810 | int ret; |
d945e1df | 1811 | |
7aa54bd7 | 1812 | shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n"); |
aef9ec39 | 1813 | |
c7c4e7ff | 1814 | if (!req || !srp_claim_req(target, req, scmnd)) |
d945e1df | 1815 | return FAILED; |
086f44f5 | 1816 | if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun, |
80d5e8a2 | 1817 | SRP_TSK_ABORT_TASK) == 0) |
086f44f5 | 1818 | ret = SUCCESS; |
ed9b2264 | 1819 | else if (target->rport->state == SRP_RPORT_LOST) |
99e1c139 | 1820 | ret = FAST_IO_FAIL; |
086f44f5 BVA |
1821 | else |
1822 | ret = FAILED; | |
22032991 BVA |
1823 | srp_free_req(target, req, scmnd, 0); |
1824 | scmnd->result = DID_ABORT << 16; | |
d8536670 | 1825 | scmnd->scsi_done(scmnd); |
d945e1df | 1826 | |
086f44f5 | 1827 | return ret; |
aef9ec39 RD |
1828 | } |
1829 | ||
1830 | static int srp_reset_device(struct scsi_cmnd *scmnd) | |
1831 | { | |
d945e1df | 1832 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
536ae14e | 1833 | int i; |
d945e1df | 1834 | |
7aa54bd7 | 1835 | shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n"); |
aef9ec39 | 1836 | |
f8b6e31e DD |
1837 | if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun, |
1838 | SRP_TSK_LUN_RESET)) | |
d945e1df | 1839 | return FAILED; |
f8b6e31e | 1840 | if (target->tsk_mgmt_status) |
d945e1df RD |
1841 | return FAILED; |
1842 | ||
536ae14e BVA |
1843 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { |
1844 | struct srp_request *req = &target->req_ring[i]; | |
f8b6e31e | 1845 | if (req->scmnd && req->scmnd->device == scmnd->device) |
ed9b2264 | 1846 | srp_finish_req(target, req, DID_RESET << 16); |
536ae14e | 1847 | } |
d945e1df | 1848 | |
d945e1df | 1849 | return SUCCESS; |
aef9ec39 RD |
1850 | } |
1851 | ||
1852 | static int srp_reset_host(struct scsi_cmnd *scmnd) | |
1853 | { | |
1854 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
aef9ec39 | 1855 | |
7aa54bd7 | 1856 | shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n"); |
aef9ec39 | 1857 | |
ed9b2264 | 1858 | return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED; |
aef9ec39 RD |
1859 | } |
1860 | ||
c9b03c1a BVA |
1861 | static int srp_slave_configure(struct scsi_device *sdev) |
1862 | { | |
1863 | struct Scsi_Host *shost = sdev->host; | |
1864 | struct srp_target_port *target = host_to_target(shost); | |
1865 | struct request_queue *q = sdev->request_queue; | |
1866 | unsigned long timeout; | |
1867 | ||
1868 | if (sdev->type == TYPE_DISK) { | |
1869 | timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies); | |
1870 | blk_queue_rq_timeout(q, timeout); | |
1871 | } | |
1872 | ||
1873 | return 0; | |
1874 | } | |
1875 | ||
ee959b00 TJ |
1876 | static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr, |
1877 | char *buf) | |
6ecb0c84 | 1878 | { |
ee959b00 | 1879 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1880 | |
6ecb0c84 RD |
1881 | return sprintf(buf, "0x%016llx\n", |
1882 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1883 | } | |
1884 | ||
ee959b00 TJ |
1885 | static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr, |
1886 | char *buf) | |
6ecb0c84 | 1887 | { |
ee959b00 | 1888 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1889 | |
6ecb0c84 RD |
1890 | return sprintf(buf, "0x%016llx\n", |
1891 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
1892 | } | |
1893 | ||
ee959b00 TJ |
1894 | static ssize_t show_service_id(struct device *dev, |
1895 | struct device_attribute *attr, char *buf) | |
6ecb0c84 | 1896 | { |
ee959b00 | 1897 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1898 | |
6ecb0c84 RD |
1899 | return sprintf(buf, "0x%016llx\n", |
1900 | (unsigned long long) be64_to_cpu(target->service_id)); | |
1901 | } | |
1902 | ||
ee959b00 TJ |
1903 | static ssize_t show_pkey(struct device *dev, struct device_attribute *attr, |
1904 | char *buf) | |
6ecb0c84 | 1905 | { |
ee959b00 | 1906 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1907 | |
6ecb0c84 RD |
1908 | return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); |
1909 | } | |
1910 | ||
ee959b00 TJ |
1911 | static ssize_t show_dgid(struct device *dev, struct device_attribute *attr, |
1912 | char *buf) | |
6ecb0c84 | 1913 | { |
ee959b00 | 1914 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1915 | |
5b095d98 | 1916 | return sprintf(buf, "%pI6\n", target->path.dgid.raw); |
6ecb0c84 RD |
1917 | } |
1918 | ||
ee959b00 TJ |
1919 | static ssize_t show_orig_dgid(struct device *dev, |
1920 | struct device_attribute *attr, char *buf) | |
3633b3d0 | 1921 | { |
ee959b00 | 1922 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
3633b3d0 | 1923 | |
5b095d98 | 1924 | return sprintf(buf, "%pI6\n", target->orig_dgid); |
3633b3d0 IR |
1925 | } |
1926 | ||
89de7486 BVA |
1927 | static ssize_t show_req_lim(struct device *dev, |
1928 | struct device_attribute *attr, char *buf) | |
1929 | { | |
1930 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1931 | ||
89de7486 BVA |
1932 | return sprintf(buf, "%d\n", target->req_lim); |
1933 | } | |
1934 | ||
ee959b00 TJ |
1935 | static ssize_t show_zero_req_lim(struct device *dev, |
1936 | struct device_attribute *attr, char *buf) | |
6bfa24fa | 1937 | { |
ee959b00 | 1938 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6bfa24fa | 1939 | |
6bfa24fa RD |
1940 | return sprintf(buf, "%d\n", target->zero_req_lim); |
1941 | } | |
1942 | ||
ee959b00 TJ |
1943 | static ssize_t show_local_ib_port(struct device *dev, |
1944 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 1945 | { |
ee959b00 | 1946 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 IR |
1947 | |
1948 | return sprintf(buf, "%d\n", target->srp_host->port); | |
1949 | } | |
1950 | ||
ee959b00 TJ |
1951 | static ssize_t show_local_ib_device(struct device *dev, |
1952 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 1953 | { |
ee959b00 | 1954 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 | 1955 | |
05321937 | 1956 | return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name); |
ded7f1a1 IR |
1957 | } |
1958 | ||
4b5e5f41 BVA |
1959 | static ssize_t show_comp_vector(struct device *dev, |
1960 | struct device_attribute *attr, char *buf) | |
1961 | { | |
1962 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1963 | ||
1964 | return sprintf(buf, "%d\n", target->comp_vector); | |
1965 | } | |
1966 | ||
7bb312e4 VP |
1967 | static ssize_t show_tl_retry_count(struct device *dev, |
1968 | struct device_attribute *attr, char *buf) | |
1969 | { | |
1970 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1971 | ||
1972 | return sprintf(buf, "%d\n", target->tl_retry_count); | |
1973 | } | |
1974 | ||
49248644 DD |
1975 | static ssize_t show_cmd_sg_entries(struct device *dev, |
1976 | struct device_attribute *attr, char *buf) | |
1977 | { | |
1978 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1979 | ||
1980 | return sprintf(buf, "%u\n", target->cmd_sg_cnt); | |
1981 | } | |
1982 | ||
c07d424d DD |
1983 | static ssize_t show_allow_ext_sg(struct device *dev, |
1984 | struct device_attribute *attr, char *buf) | |
1985 | { | |
1986 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1987 | ||
1988 | return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false"); | |
1989 | } | |
1990 | ||
ee959b00 TJ |
1991 | static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); |
1992 | static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); | |
1993 | static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); | |
1994 | static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); | |
1995 | static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); | |
1996 | static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL); | |
89de7486 | 1997 | static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL); |
ee959b00 TJ |
1998 | static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); |
1999 | static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); | |
2000 | static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); | |
4b5e5f41 | 2001 | static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL); |
7bb312e4 | 2002 | static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL); |
49248644 | 2003 | static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL); |
c07d424d | 2004 | static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL); |
ee959b00 TJ |
2005 | |
2006 | static struct device_attribute *srp_host_attrs[] = { | |
2007 | &dev_attr_id_ext, | |
2008 | &dev_attr_ioc_guid, | |
2009 | &dev_attr_service_id, | |
2010 | &dev_attr_pkey, | |
2011 | &dev_attr_dgid, | |
2012 | &dev_attr_orig_dgid, | |
89de7486 | 2013 | &dev_attr_req_lim, |
ee959b00 TJ |
2014 | &dev_attr_zero_req_lim, |
2015 | &dev_attr_local_ib_port, | |
2016 | &dev_attr_local_ib_device, | |
4b5e5f41 | 2017 | &dev_attr_comp_vector, |
7bb312e4 | 2018 | &dev_attr_tl_retry_count, |
49248644 | 2019 | &dev_attr_cmd_sg_entries, |
c07d424d | 2020 | &dev_attr_allow_ext_sg, |
6ecb0c84 RD |
2021 | NULL |
2022 | }; | |
2023 | ||
aef9ec39 RD |
2024 | static struct scsi_host_template srp_template = { |
2025 | .module = THIS_MODULE, | |
b7f008fd RD |
2026 | .name = "InfiniBand SRP initiator", |
2027 | .proc_name = DRV_NAME, | |
c9b03c1a | 2028 | .slave_configure = srp_slave_configure, |
aef9ec39 RD |
2029 | .info = srp_target_info, |
2030 | .queuecommand = srp_queuecommand, | |
2031 | .eh_abort_handler = srp_abort, | |
2032 | .eh_device_reset_handler = srp_reset_device, | |
2033 | .eh_host_reset_handler = srp_reset_host, | |
2742c1da | 2034 | .skip_settle_delay = true, |
49248644 | 2035 | .sg_tablesize = SRP_DEF_SG_TABLESIZE, |
dd5e6e38 | 2036 | .can_queue = SRP_CMD_SQ_SIZE, |
aef9ec39 | 2037 | .this_id = -1, |
dd5e6e38 | 2038 | .cmd_per_lun = SRP_CMD_SQ_SIZE, |
6ecb0c84 RD |
2039 | .use_clustering = ENABLE_CLUSTERING, |
2040 | .shost_attrs = srp_host_attrs | |
aef9ec39 RD |
2041 | }; |
2042 | ||
2043 | static int srp_add_target(struct srp_host *host, struct srp_target_port *target) | |
2044 | { | |
3236822b FT |
2045 | struct srp_rport_identifiers ids; |
2046 | struct srp_rport *rport; | |
2047 | ||
aef9ec39 RD |
2048 | sprintf(target->target_name, "SRP.T10:%016llX", |
2049 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
2050 | ||
05321937 | 2051 | if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device)) |
aef9ec39 RD |
2052 | return -ENODEV; |
2053 | ||
3236822b FT |
2054 | memcpy(ids.port_id, &target->id_ext, 8); |
2055 | memcpy(ids.port_id + 8, &target->ioc_guid, 8); | |
aebd5e47 | 2056 | ids.roles = SRP_RPORT_ROLE_TARGET; |
3236822b FT |
2057 | rport = srp_rport_add(target->scsi_host, &ids); |
2058 | if (IS_ERR(rport)) { | |
2059 | scsi_remove_host(target->scsi_host); | |
2060 | return PTR_ERR(rport); | |
2061 | } | |
2062 | ||
dc1bdbd9 | 2063 | rport->lld_data = target; |
9dd69a60 | 2064 | target->rport = rport; |
dc1bdbd9 | 2065 | |
b3589fd4 | 2066 | spin_lock(&host->target_lock); |
aef9ec39 | 2067 | list_add_tail(&target->list, &host->target_list); |
b3589fd4 | 2068 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
2069 | |
2070 | target->state = SRP_TARGET_LIVE; | |
2071 | ||
aef9ec39 | 2072 | scsi_scan_target(&target->scsi_host->shost_gendev, |
1962a4a1 | 2073 | 0, target->scsi_id, SCAN_WILD_CARD, 0); |
aef9ec39 RD |
2074 | |
2075 | return 0; | |
2076 | } | |
2077 | ||
ee959b00 | 2078 | static void srp_release_dev(struct device *dev) |
aef9ec39 RD |
2079 | { |
2080 | struct srp_host *host = | |
ee959b00 | 2081 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2082 | |
2083 | complete(&host->released); | |
2084 | } | |
2085 | ||
2086 | static struct class srp_class = { | |
2087 | .name = "infiniband_srp", | |
ee959b00 | 2088 | .dev_release = srp_release_dev |
aef9ec39 RD |
2089 | }; |
2090 | ||
96fc248a BVA |
2091 | /** |
2092 | * srp_conn_unique() - check whether the connection to a target is unique | |
2093 | */ | |
2094 | static bool srp_conn_unique(struct srp_host *host, | |
2095 | struct srp_target_port *target) | |
2096 | { | |
2097 | struct srp_target_port *t; | |
2098 | bool ret = false; | |
2099 | ||
2100 | if (target->state == SRP_TARGET_REMOVED) | |
2101 | goto out; | |
2102 | ||
2103 | ret = true; | |
2104 | ||
2105 | spin_lock(&host->target_lock); | |
2106 | list_for_each_entry(t, &host->target_list, list) { | |
2107 | if (t != target && | |
2108 | target->id_ext == t->id_ext && | |
2109 | target->ioc_guid == t->ioc_guid && | |
2110 | target->initiator_ext == t->initiator_ext) { | |
2111 | ret = false; | |
2112 | break; | |
2113 | } | |
2114 | } | |
2115 | spin_unlock(&host->target_lock); | |
2116 | ||
2117 | out: | |
2118 | return ret; | |
2119 | } | |
2120 | ||
aef9ec39 RD |
2121 | /* |
2122 | * Target ports are added by writing | |
2123 | * | |
2124 | * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, | |
2125 | * pkey=<P_Key>,service_id=<service ID> | |
2126 | * | |
2127 | * to the add_target sysfs attribute. | |
2128 | */ | |
2129 | enum { | |
2130 | SRP_OPT_ERR = 0, | |
2131 | SRP_OPT_ID_EXT = 1 << 0, | |
2132 | SRP_OPT_IOC_GUID = 1 << 1, | |
2133 | SRP_OPT_DGID = 1 << 2, | |
2134 | SRP_OPT_PKEY = 1 << 3, | |
2135 | SRP_OPT_SERVICE_ID = 1 << 4, | |
2136 | SRP_OPT_MAX_SECT = 1 << 5, | |
52fb2b50 | 2137 | SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, |
0c0450db | 2138 | SRP_OPT_IO_CLASS = 1 << 7, |
01cb9bcb | 2139 | SRP_OPT_INITIATOR_EXT = 1 << 8, |
49248644 | 2140 | SRP_OPT_CMD_SG_ENTRIES = 1 << 9, |
c07d424d DD |
2141 | SRP_OPT_ALLOW_EXT_SG = 1 << 10, |
2142 | SRP_OPT_SG_TABLESIZE = 1 << 11, | |
4b5e5f41 | 2143 | SRP_OPT_COMP_VECTOR = 1 << 12, |
7bb312e4 | 2144 | SRP_OPT_TL_RETRY_COUNT = 1 << 13, |
aef9ec39 RD |
2145 | SRP_OPT_ALL = (SRP_OPT_ID_EXT | |
2146 | SRP_OPT_IOC_GUID | | |
2147 | SRP_OPT_DGID | | |
2148 | SRP_OPT_PKEY | | |
2149 | SRP_OPT_SERVICE_ID), | |
2150 | }; | |
2151 | ||
a447c093 | 2152 | static const match_table_t srp_opt_tokens = { |
52fb2b50 VP |
2153 | { SRP_OPT_ID_EXT, "id_ext=%s" }, |
2154 | { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, | |
2155 | { SRP_OPT_DGID, "dgid=%s" }, | |
2156 | { SRP_OPT_PKEY, "pkey=%x" }, | |
2157 | { SRP_OPT_SERVICE_ID, "service_id=%s" }, | |
2158 | { SRP_OPT_MAX_SECT, "max_sect=%d" }, | |
2159 | { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, | |
0c0450db | 2160 | { SRP_OPT_IO_CLASS, "io_class=%x" }, |
01cb9bcb | 2161 | { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, |
49248644 | 2162 | { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" }, |
c07d424d DD |
2163 | { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" }, |
2164 | { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" }, | |
4b5e5f41 | 2165 | { SRP_OPT_COMP_VECTOR, "comp_vector=%u" }, |
7bb312e4 | 2166 | { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" }, |
52fb2b50 | 2167 | { SRP_OPT_ERR, NULL } |
aef9ec39 RD |
2168 | }; |
2169 | ||
2170 | static int srp_parse_options(const char *buf, struct srp_target_port *target) | |
2171 | { | |
2172 | char *options, *sep_opt; | |
2173 | char *p; | |
2174 | char dgid[3]; | |
2175 | substring_t args[MAX_OPT_ARGS]; | |
2176 | int opt_mask = 0; | |
2177 | int token; | |
2178 | int ret = -EINVAL; | |
2179 | int i; | |
2180 | ||
2181 | options = kstrdup(buf, GFP_KERNEL); | |
2182 | if (!options) | |
2183 | return -ENOMEM; | |
2184 | ||
2185 | sep_opt = options; | |
2186 | while ((p = strsep(&sep_opt, ",")) != NULL) { | |
2187 | if (!*p) | |
2188 | continue; | |
2189 | ||
2190 | token = match_token(p, srp_opt_tokens, args); | |
2191 | opt_mask |= token; | |
2192 | ||
2193 | switch (token) { | |
2194 | case SRP_OPT_ID_EXT: | |
2195 | p = match_strdup(args); | |
a20f3a6d IR |
2196 | if (!p) { |
2197 | ret = -ENOMEM; | |
2198 | goto out; | |
2199 | } | |
aef9ec39 RD |
2200 | target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2201 | kfree(p); | |
2202 | break; | |
2203 | ||
2204 | case SRP_OPT_IOC_GUID: | |
2205 | p = match_strdup(args); | |
a20f3a6d IR |
2206 | if (!p) { |
2207 | ret = -ENOMEM; | |
2208 | goto out; | |
2209 | } | |
aef9ec39 RD |
2210 | target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2211 | kfree(p); | |
2212 | break; | |
2213 | ||
2214 | case SRP_OPT_DGID: | |
2215 | p = match_strdup(args); | |
a20f3a6d IR |
2216 | if (!p) { |
2217 | ret = -ENOMEM; | |
2218 | goto out; | |
2219 | } | |
aef9ec39 | 2220 | if (strlen(p) != 32) { |
e0bda7d8 | 2221 | pr_warn("bad dest GID parameter '%s'\n", p); |
ce1823f0 | 2222 | kfree(p); |
aef9ec39 RD |
2223 | goto out; |
2224 | } | |
2225 | ||
2226 | for (i = 0; i < 16; ++i) { | |
2227 | strlcpy(dgid, p + i * 2, 3); | |
2228 | target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); | |
2229 | } | |
bf17c1c7 | 2230 | kfree(p); |
3633b3d0 | 2231 | memcpy(target->orig_dgid, target->path.dgid.raw, 16); |
aef9ec39 RD |
2232 | break; |
2233 | ||
2234 | case SRP_OPT_PKEY: | |
2235 | if (match_hex(args, &token)) { | |
e0bda7d8 | 2236 | pr_warn("bad P_Key parameter '%s'\n", p); |
aef9ec39 RD |
2237 | goto out; |
2238 | } | |
2239 | target->path.pkey = cpu_to_be16(token); | |
2240 | break; | |
2241 | ||
2242 | case SRP_OPT_SERVICE_ID: | |
2243 | p = match_strdup(args); | |
a20f3a6d IR |
2244 | if (!p) { |
2245 | ret = -ENOMEM; | |
2246 | goto out; | |
2247 | } | |
aef9ec39 | 2248 | target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
247e020e | 2249 | target->path.service_id = target->service_id; |
aef9ec39 RD |
2250 | kfree(p); |
2251 | break; | |
2252 | ||
2253 | case SRP_OPT_MAX_SECT: | |
2254 | if (match_int(args, &token)) { | |
e0bda7d8 | 2255 | pr_warn("bad max sect parameter '%s'\n", p); |
aef9ec39 RD |
2256 | goto out; |
2257 | } | |
2258 | target->scsi_host->max_sectors = token; | |
2259 | break; | |
2260 | ||
52fb2b50 VP |
2261 | case SRP_OPT_MAX_CMD_PER_LUN: |
2262 | if (match_int(args, &token)) { | |
e0bda7d8 BVA |
2263 | pr_warn("bad max cmd_per_lun parameter '%s'\n", |
2264 | p); | |
52fb2b50 VP |
2265 | goto out; |
2266 | } | |
dd5e6e38 | 2267 | target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE); |
52fb2b50 VP |
2268 | break; |
2269 | ||
0c0450db R |
2270 | case SRP_OPT_IO_CLASS: |
2271 | if (match_hex(args, &token)) { | |
e0bda7d8 | 2272 | pr_warn("bad IO class parameter '%s'\n", p); |
0c0450db R |
2273 | goto out; |
2274 | } | |
2275 | if (token != SRP_REV10_IB_IO_CLASS && | |
2276 | token != SRP_REV16A_IB_IO_CLASS) { | |
e0bda7d8 BVA |
2277 | pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n", |
2278 | token, SRP_REV10_IB_IO_CLASS, | |
2279 | SRP_REV16A_IB_IO_CLASS); | |
0c0450db R |
2280 | goto out; |
2281 | } | |
2282 | target->io_class = token; | |
2283 | break; | |
2284 | ||
01cb9bcb IR |
2285 | case SRP_OPT_INITIATOR_EXT: |
2286 | p = match_strdup(args); | |
a20f3a6d IR |
2287 | if (!p) { |
2288 | ret = -ENOMEM; | |
2289 | goto out; | |
2290 | } | |
01cb9bcb IR |
2291 | target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2292 | kfree(p); | |
2293 | break; | |
2294 | ||
49248644 DD |
2295 | case SRP_OPT_CMD_SG_ENTRIES: |
2296 | if (match_int(args, &token) || token < 1 || token > 255) { | |
e0bda7d8 BVA |
2297 | pr_warn("bad max cmd_sg_entries parameter '%s'\n", |
2298 | p); | |
49248644 DD |
2299 | goto out; |
2300 | } | |
2301 | target->cmd_sg_cnt = token; | |
2302 | break; | |
2303 | ||
c07d424d DD |
2304 | case SRP_OPT_ALLOW_EXT_SG: |
2305 | if (match_int(args, &token)) { | |
e0bda7d8 | 2306 | pr_warn("bad allow_ext_sg parameter '%s'\n", p); |
c07d424d DD |
2307 | goto out; |
2308 | } | |
2309 | target->allow_ext_sg = !!token; | |
2310 | break; | |
2311 | ||
2312 | case SRP_OPT_SG_TABLESIZE: | |
2313 | if (match_int(args, &token) || token < 1 || | |
2314 | token > SCSI_MAX_SG_CHAIN_SEGMENTS) { | |
e0bda7d8 BVA |
2315 | pr_warn("bad max sg_tablesize parameter '%s'\n", |
2316 | p); | |
c07d424d DD |
2317 | goto out; |
2318 | } | |
2319 | target->sg_tablesize = token; | |
2320 | break; | |
2321 | ||
4b5e5f41 BVA |
2322 | case SRP_OPT_COMP_VECTOR: |
2323 | if (match_int(args, &token) || token < 0) { | |
2324 | pr_warn("bad comp_vector parameter '%s'\n", p); | |
2325 | goto out; | |
2326 | } | |
2327 | target->comp_vector = token; | |
2328 | break; | |
2329 | ||
7bb312e4 VP |
2330 | case SRP_OPT_TL_RETRY_COUNT: |
2331 | if (match_int(args, &token) || token < 2 || token > 7) { | |
2332 | pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n", | |
2333 | p); | |
2334 | goto out; | |
2335 | } | |
2336 | target->tl_retry_count = token; | |
2337 | break; | |
2338 | ||
aef9ec39 | 2339 | default: |
e0bda7d8 BVA |
2340 | pr_warn("unknown parameter or missing value '%s' in target creation request\n", |
2341 | p); | |
aef9ec39 RD |
2342 | goto out; |
2343 | } | |
2344 | } | |
2345 | ||
2346 | if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) | |
2347 | ret = 0; | |
2348 | else | |
2349 | for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) | |
2350 | if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && | |
2351 | !(srp_opt_tokens[i].token & opt_mask)) | |
e0bda7d8 BVA |
2352 | pr_warn("target creation request is missing parameter '%s'\n", |
2353 | srp_opt_tokens[i].pattern); | |
aef9ec39 RD |
2354 | |
2355 | out: | |
2356 | kfree(options); | |
2357 | return ret; | |
2358 | } | |
2359 | ||
ee959b00 TJ |
2360 | static ssize_t srp_create_target(struct device *dev, |
2361 | struct device_attribute *attr, | |
aef9ec39 RD |
2362 | const char *buf, size_t count) |
2363 | { | |
2364 | struct srp_host *host = | |
ee959b00 | 2365 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2366 | struct Scsi_Host *target_host; |
2367 | struct srp_target_port *target; | |
c07d424d DD |
2368 | struct ib_device *ibdev = host->srp_dev->dev; |
2369 | dma_addr_t dma_addr; | |
8f26c9ff | 2370 | int i, ret; |
aef9ec39 RD |
2371 | |
2372 | target_host = scsi_host_alloc(&srp_template, | |
2373 | sizeof (struct srp_target_port)); | |
2374 | if (!target_host) | |
2375 | return -ENOMEM; | |
2376 | ||
49248644 | 2377 | target_host->transportt = ib_srp_transport_template; |
fd1b6c4a BVA |
2378 | target_host->max_channel = 0; |
2379 | target_host->max_id = 1; | |
3c8edf0e AR |
2380 | target_host->max_lun = SRP_MAX_LUN; |
2381 | target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; | |
5f068992 | 2382 | |
aef9ec39 | 2383 | target = host_to_target(target_host); |
aef9ec39 | 2384 | |
49248644 DD |
2385 | target->io_class = SRP_REV16A_IB_IO_CLASS; |
2386 | target->scsi_host = target_host; | |
2387 | target->srp_host = host; | |
2388 | target->lkey = host->srp_dev->mr->lkey; | |
2389 | target->rkey = host->srp_dev->mr->rkey; | |
2390 | target->cmd_sg_cnt = cmd_sg_entries; | |
c07d424d DD |
2391 | target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries; |
2392 | target->allow_ext_sg = allow_ext_sg; | |
7bb312e4 | 2393 | target->tl_retry_count = 7; |
aef9ec39 | 2394 | |
aef9ec39 RD |
2395 | ret = srp_parse_options(buf, target); |
2396 | if (ret) | |
2397 | goto err; | |
2398 | ||
96fc248a BVA |
2399 | if (!srp_conn_unique(target->srp_host, target)) { |
2400 | shost_printk(KERN_INFO, target->scsi_host, | |
2401 | PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n", | |
2402 | be64_to_cpu(target->id_ext), | |
2403 | be64_to_cpu(target->ioc_guid), | |
2404 | be64_to_cpu(target->initiator_ext)); | |
2405 | ret = -EEXIST; | |
2406 | goto err; | |
2407 | } | |
2408 | ||
c07d424d DD |
2409 | if (!host->srp_dev->fmr_pool && !target->allow_ext_sg && |
2410 | target->cmd_sg_cnt < target->sg_tablesize) { | |
e0bda7d8 | 2411 | pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n"); |
c07d424d DD |
2412 | target->sg_tablesize = target->cmd_sg_cnt; |
2413 | } | |
2414 | ||
2415 | target_host->sg_tablesize = target->sg_tablesize; | |
2416 | target->indirect_size = target->sg_tablesize * | |
2417 | sizeof (struct srp_direct_buf); | |
49248644 DD |
2418 | target->max_iu_len = sizeof (struct srp_cmd) + |
2419 | sizeof (struct srp_indirect_buf) + | |
2420 | target->cmd_sg_cnt * sizeof (struct srp_direct_buf); | |
2421 | ||
ef6c49d8 | 2422 | INIT_WORK(&target->remove_work, srp_remove_work); |
8f26c9ff DD |
2423 | spin_lock_init(&target->lock); |
2424 | INIT_LIST_HEAD(&target->free_tx); | |
2425 | INIT_LIST_HEAD(&target->free_reqs); | |
2426 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { | |
2427 | struct srp_request *req = &target->req_ring[i]; | |
2428 | ||
2429 | req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *), | |
2430 | GFP_KERNEL); | |
2431 | req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *), | |
2432 | GFP_KERNEL); | |
c07d424d DD |
2433 | req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL); |
2434 | if (!req->fmr_list || !req->map_page || !req->indirect_desc) | |
8f26c9ff DD |
2435 | goto err_free_mem; |
2436 | ||
c07d424d DD |
2437 | dma_addr = ib_dma_map_single(ibdev, req->indirect_desc, |
2438 | target->indirect_size, | |
2439 | DMA_TO_DEVICE); | |
2440 | if (ib_dma_mapping_error(ibdev, dma_addr)) | |
2441 | goto err_free_mem; | |
2442 | ||
2443 | req->indirect_dma_addr = dma_addr; | |
8f26c9ff DD |
2444 | req->index = i; |
2445 | list_add_tail(&req->list, &target->free_reqs); | |
2446 | } | |
2447 | ||
c07d424d | 2448 | ib_query_gid(ibdev, host->port, 0, &target->path.sgid); |
aef9ec39 | 2449 | |
7aa54bd7 DD |
2450 | shost_printk(KERN_DEBUG, target->scsi_host, PFX |
2451 | "new target: id_ext %016llx ioc_guid %016llx pkey %04x " | |
5b095d98 | 2452 | "service_id %016llx dgid %pI6\n", |
aef9ec39 RD |
2453 | (unsigned long long) be64_to_cpu(target->id_ext), |
2454 | (unsigned long long) be64_to_cpu(target->ioc_guid), | |
2455 | be16_to_cpu(target->path.pkey), | |
2456 | (unsigned long long) be64_to_cpu(target->service_id), | |
8867cd7c | 2457 | target->path.dgid.raw); |
aef9ec39 RD |
2458 | |
2459 | ret = srp_create_target_ib(target); | |
2460 | if (ret) | |
8f26c9ff | 2461 | goto err_free_mem; |
aef9ec39 | 2462 | |
9fe4bcf4 DD |
2463 | ret = srp_new_cm_id(target); |
2464 | if (ret) | |
8f26c9ff | 2465 | goto err_free_ib; |
aef9ec39 RD |
2466 | |
2467 | ret = srp_connect_target(target); | |
2468 | if (ret) { | |
7aa54bd7 DD |
2469 | shost_printk(KERN_ERR, target->scsi_host, |
2470 | PFX "Connection failed\n"); | |
aef9ec39 RD |
2471 | goto err_cm_id; |
2472 | } | |
2473 | ||
2474 | ret = srp_add_target(host, target); | |
2475 | if (ret) | |
2476 | goto err_disconnect; | |
2477 | ||
2478 | return count; | |
2479 | ||
2480 | err_disconnect: | |
2481 | srp_disconnect_target(target); | |
2482 | ||
2483 | err_cm_id: | |
2484 | ib_destroy_cm_id(target->cm_id); | |
2485 | ||
8f26c9ff | 2486 | err_free_ib: |
aef9ec39 RD |
2487 | srp_free_target_ib(target); |
2488 | ||
8f26c9ff DD |
2489 | err_free_mem: |
2490 | srp_free_req_data(target); | |
2491 | ||
aef9ec39 RD |
2492 | err: |
2493 | scsi_host_put(target_host); | |
2494 | ||
2495 | return ret; | |
2496 | } | |
2497 | ||
ee959b00 | 2498 | static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); |
aef9ec39 | 2499 | |
ee959b00 TJ |
2500 | static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, |
2501 | char *buf) | |
aef9ec39 | 2502 | { |
ee959b00 | 2503 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 | 2504 | |
05321937 | 2505 | return sprintf(buf, "%s\n", host->srp_dev->dev->name); |
aef9ec39 RD |
2506 | } |
2507 | ||
ee959b00 | 2508 | static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
aef9ec39 | 2509 | |
ee959b00 TJ |
2510 | static ssize_t show_port(struct device *dev, struct device_attribute *attr, |
2511 | char *buf) | |
aef9ec39 | 2512 | { |
ee959b00 | 2513 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2514 | |
2515 | return sprintf(buf, "%d\n", host->port); | |
2516 | } | |
2517 | ||
ee959b00 | 2518 | static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); |
aef9ec39 | 2519 | |
f5358a17 | 2520 | static struct srp_host *srp_add_port(struct srp_device *device, u8 port) |
aef9ec39 RD |
2521 | { |
2522 | struct srp_host *host; | |
2523 | ||
2524 | host = kzalloc(sizeof *host, GFP_KERNEL); | |
2525 | if (!host) | |
2526 | return NULL; | |
2527 | ||
2528 | INIT_LIST_HEAD(&host->target_list); | |
b3589fd4 | 2529 | spin_lock_init(&host->target_lock); |
aef9ec39 | 2530 | init_completion(&host->released); |
05321937 | 2531 | host->srp_dev = device; |
aef9ec39 RD |
2532 | host->port = port; |
2533 | ||
ee959b00 TJ |
2534 | host->dev.class = &srp_class; |
2535 | host->dev.parent = device->dev->dma_device; | |
d927e38c | 2536 | dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port); |
aef9ec39 | 2537 | |
ee959b00 | 2538 | if (device_register(&host->dev)) |
f5358a17 | 2539 | goto free_host; |
ee959b00 | 2540 | if (device_create_file(&host->dev, &dev_attr_add_target)) |
aef9ec39 | 2541 | goto err_class; |
ee959b00 | 2542 | if (device_create_file(&host->dev, &dev_attr_ibdev)) |
aef9ec39 | 2543 | goto err_class; |
ee959b00 | 2544 | if (device_create_file(&host->dev, &dev_attr_port)) |
aef9ec39 RD |
2545 | goto err_class; |
2546 | ||
2547 | return host; | |
2548 | ||
2549 | err_class: | |
ee959b00 | 2550 | device_unregister(&host->dev); |
aef9ec39 | 2551 | |
f5358a17 | 2552 | free_host: |
aef9ec39 RD |
2553 | kfree(host); |
2554 | ||
2555 | return NULL; | |
2556 | } | |
2557 | ||
2558 | static void srp_add_one(struct ib_device *device) | |
2559 | { | |
f5358a17 RD |
2560 | struct srp_device *srp_dev; |
2561 | struct ib_device_attr *dev_attr; | |
2562 | struct ib_fmr_pool_param fmr_param; | |
aef9ec39 | 2563 | struct srp_host *host; |
be8b9814 | 2564 | int max_pages_per_fmr, fmr_page_shift, s, e, p; |
aef9ec39 | 2565 | |
f5358a17 RD |
2566 | dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); |
2567 | if (!dev_attr) | |
cf311cd4 | 2568 | return; |
aef9ec39 | 2569 | |
f5358a17 | 2570 | if (ib_query_device(device, dev_attr)) { |
e0bda7d8 | 2571 | pr_warn("Query device failed for %s\n", device->name); |
f5358a17 RD |
2572 | goto free_attr; |
2573 | } | |
2574 | ||
2575 | srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); | |
2576 | if (!srp_dev) | |
2577 | goto free_attr; | |
2578 | ||
2579 | /* | |
2580 | * Use the smallest page size supported by the HCA, down to a | |
8f26c9ff DD |
2581 | * minimum of 4096 bytes. We're unlikely to build large sglists |
2582 | * out of smaller entries. | |
f5358a17 | 2583 | */ |
8f26c9ff DD |
2584 | fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1); |
2585 | srp_dev->fmr_page_size = 1 << fmr_page_shift; | |
2586 | srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1); | |
2587 | srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE; | |
f5358a17 RD |
2588 | |
2589 | INIT_LIST_HEAD(&srp_dev->dev_list); | |
2590 | ||
2591 | srp_dev->dev = device; | |
2592 | srp_dev->pd = ib_alloc_pd(device); | |
2593 | if (IS_ERR(srp_dev->pd)) | |
2594 | goto free_dev; | |
2595 | ||
2596 | srp_dev->mr = ib_get_dma_mr(srp_dev->pd, | |
2597 | IB_ACCESS_LOCAL_WRITE | | |
2598 | IB_ACCESS_REMOTE_READ | | |
2599 | IB_ACCESS_REMOTE_WRITE); | |
2600 | if (IS_ERR(srp_dev->mr)) | |
2601 | goto err_pd; | |
2602 | ||
be8b9814 DD |
2603 | for (max_pages_per_fmr = SRP_FMR_SIZE; |
2604 | max_pages_per_fmr >= SRP_FMR_MIN_SIZE; | |
2605 | max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) { | |
2606 | memset(&fmr_param, 0, sizeof fmr_param); | |
2607 | fmr_param.pool_size = SRP_FMR_POOL_SIZE; | |
2608 | fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; | |
2609 | fmr_param.cache = 1; | |
2610 | fmr_param.max_pages_per_fmr = max_pages_per_fmr; | |
2611 | fmr_param.page_shift = fmr_page_shift; | |
2612 | fmr_param.access = (IB_ACCESS_LOCAL_WRITE | | |
2613 | IB_ACCESS_REMOTE_WRITE | | |
2614 | IB_ACCESS_REMOTE_READ); | |
2615 | ||
2616 | srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); | |
2617 | if (!IS_ERR(srp_dev->fmr_pool)) | |
2618 | break; | |
2619 | } | |
2620 | ||
f5358a17 RD |
2621 | if (IS_ERR(srp_dev->fmr_pool)) |
2622 | srp_dev->fmr_pool = NULL; | |
aef9ec39 | 2623 | |
07ebafba | 2624 | if (device->node_type == RDMA_NODE_IB_SWITCH) { |
aef9ec39 RD |
2625 | s = 0; |
2626 | e = 0; | |
2627 | } else { | |
2628 | s = 1; | |
2629 | e = device->phys_port_cnt; | |
2630 | } | |
2631 | ||
2632 | for (p = s; p <= e; ++p) { | |
f5358a17 | 2633 | host = srp_add_port(srp_dev, p); |
aef9ec39 | 2634 | if (host) |
f5358a17 | 2635 | list_add_tail(&host->list, &srp_dev->dev_list); |
aef9ec39 RD |
2636 | } |
2637 | ||
f5358a17 RD |
2638 | ib_set_client_data(device, &srp_client, srp_dev); |
2639 | ||
2640 | goto free_attr; | |
2641 | ||
2642 | err_pd: | |
2643 | ib_dealloc_pd(srp_dev->pd); | |
2644 | ||
2645 | free_dev: | |
2646 | kfree(srp_dev); | |
2647 | ||
2648 | free_attr: | |
2649 | kfree(dev_attr); | |
aef9ec39 RD |
2650 | } |
2651 | ||
2652 | static void srp_remove_one(struct ib_device *device) | |
2653 | { | |
f5358a17 | 2654 | struct srp_device *srp_dev; |
aef9ec39 | 2655 | struct srp_host *host, *tmp_host; |
ef6c49d8 | 2656 | struct srp_target_port *target; |
aef9ec39 | 2657 | |
f5358a17 | 2658 | srp_dev = ib_get_client_data(device, &srp_client); |
1fe0cb84 DB |
2659 | if (!srp_dev) |
2660 | return; | |
aef9ec39 | 2661 | |
f5358a17 | 2662 | list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { |
ee959b00 | 2663 | device_unregister(&host->dev); |
aef9ec39 RD |
2664 | /* |
2665 | * Wait for the sysfs entry to go away, so that no new | |
2666 | * target ports can be created. | |
2667 | */ | |
2668 | wait_for_completion(&host->released); | |
2669 | ||
2670 | /* | |
ef6c49d8 | 2671 | * Remove all target ports. |
aef9ec39 | 2672 | */ |
b3589fd4 | 2673 | spin_lock(&host->target_lock); |
ef6c49d8 BVA |
2674 | list_for_each_entry(target, &host->target_list, list) |
2675 | srp_queue_remove_work(target); | |
b3589fd4 | 2676 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
2677 | |
2678 | /* | |
ef6c49d8 | 2679 | * Wait for target port removal tasks. |
aef9ec39 | 2680 | */ |
ef6c49d8 | 2681 | flush_workqueue(system_long_wq); |
aef9ec39 | 2682 | |
aef9ec39 RD |
2683 | kfree(host); |
2684 | } | |
2685 | ||
f5358a17 RD |
2686 | if (srp_dev->fmr_pool) |
2687 | ib_destroy_fmr_pool(srp_dev->fmr_pool); | |
2688 | ib_dereg_mr(srp_dev->mr); | |
2689 | ib_dealloc_pd(srp_dev->pd); | |
2690 | ||
2691 | kfree(srp_dev); | |
aef9ec39 RD |
2692 | } |
2693 | ||
3236822b | 2694 | static struct srp_function_template ib_srp_transport_functions = { |
ed9b2264 BVA |
2695 | .has_rport_state = true, |
2696 | .reset_timer_if_blocked = true, | |
2697 | .fast_io_fail_tmo = &srp_fast_io_fail_tmo, | |
2698 | .dev_loss_tmo = &srp_dev_loss_tmo, | |
2699 | .reconnect = srp_rport_reconnect, | |
dc1bdbd9 | 2700 | .rport_delete = srp_rport_delete, |
ed9b2264 | 2701 | .terminate_rport_io = srp_terminate_io, |
3236822b FT |
2702 | }; |
2703 | ||
aef9ec39 RD |
2704 | static int __init srp_init_module(void) |
2705 | { | |
2706 | int ret; | |
2707 | ||
dcb4cb85 | 2708 | BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *)); |
dd5e6e38 | 2709 | |
49248644 | 2710 | if (srp_sg_tablesize) { |
e0bda7d8 | 2711 | pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n"); |
49248644 DD |
2712 | if (!cmd_sg_entries) |
2713 | cmd_sg_entries = srp_sg_tablesize; | |
2714 | } | |
2715 | ||
2716 | if (!cmd_sg_entries) | |
2717 | cmd_sg_entries = SRP_DEF_SG_TABLESIZE; | |
2718 | ||
2719 | if (cmd_sg_entries > 255) { | |
e0bda7d8 | 2720 | pr_warn("Clamping cmd_sg_entries to 255\n"); |
49248644 | 2721 | cmd_sg_entries = 255; |
1e89a194 DD |
2722 | } |
2723 | ||
c07d424d DD |
2724 | if (!indirect_sg_entries) |
2725 | indirect_sg_entries = cmd_sg_entries; | |
2726 | else if (indirect_sg_entries < cmd_sg_entries) { | |
e0bda7d8 BVA |
2727 | pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n", |
2728 | cmd_sg_entries); | |
c07d424d DD |
2729 | indirect_sg_entries = cmd_sg_entries; |
2730 | } | |
2731 | ||
3236822b FT |
2732 | ib_srp_transport_template = |
2733 | srp_attach_transport(&ib_srp_transport_functions); | |
2734 | if (!ib_srp_transport_template) | |
2735 | return -ENOMEM; | |
2736 | ||
aef9ec39 RD |
2737 | ret = class_register(&srp_class); |
2738 | if (ret) { | |
e0bda7d8 | 2739 | pr_err("couldn't register class infiniband_srp\n"); |
3236822b | 2740 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
2741 | return ret; |
2742 | } | |
2743 | ||
c1a0b23b MT |
2744 | ib_sa_register_client(&srp_sa_client); |
2745 | ||
aef9ec39 RD |
2746 | ret = ib_register_client(&srp_client); |
2747 | if (ret) { | |
e0bda7d8 | 2748 | pr_err("couldn't register IB client\n"); |
3236822b | 2749 | srp_release_transport(ib_srp_transport_template); |
c1a0b23b | 2750 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 RD |
2751 | class_unregister(&srp_class); |
2752 | return ret; | |
2753 | } | |
2754 | ||
2755 | return 0; | |
2756 | } | |
2757 | ||
2758 | static void __exit srp_cleanup_module(void) | |
2759 | { | |
2760 | ib_unregister_client(&srp_client); | |
c1a0b23b | 2761 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 | 2762 | class_unregister(&srp_class); |
3236822b | 2763 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
2764 | } |
2765 | ||
2766 | module_init(srp_init_module); | |
2767 | module_exit(srp_cleanup_module); |