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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. | |
31 | * | |
32 | * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $ | |
33 | */ | |
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 RD |
43 | |
44 | #include <asm/atomic.h> | |
45 | ||
46 | #include <scsi/scsi.h> | |
47 | #include <scsi/scsi_device.h> | |
48 | #include <scsi/scsi_dbg.h> | |
49 | #include <scsi/srp.h> | |
50 | ||
51 | #include <rdma/ib_cache.h> | |
52 | ||
53 | #include "ib_srp.h" | |
54 | ||
55 | #define DRV_NAME "ib_srp" | |
56 | #define PFX DRV_NAME ": " | |
57 | #define DRV_VERSION "0.2" | |
58 | #define DRV_RELDATE "November 1, 2005" | |
59 | ||
60 | MODULE_AUTHOR("Roland Dreier"); | |
61 | MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator " | |
62 | "v" DRV_VERSION " (" DRV_RELDATE ")"); | |
63 | MODULE_LICENSE("Dual BSD/GPL"); | |
64 | ||
65 | static int topspin_workarounds = 1; | |
66 | ||
67 | module_param(topspin_workarounds, int, 0444); | |
68 | MODULE_PARM_DESC(topspin_workarounds, | |
69 | "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); | |
70 | ||
71 | static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; | |
72 | ||
73 | static void srp_add_one(struct ib_device *device); | |
74 | static void srp_remove_one(struct ib_device *device); | |
75 | static void srp_completion(struct ib_cq *cq, void *target_ptr); | |
76 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); | |
77 | ||
78 | static struct ib_client srp_client = { | |
79 | .name = "srp", | |
80 | .add = srp_add_one, | |
81 | .remove = srp_remove_one | |
82 | }; | |
83 | ||
84 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) | |
85 | { | |
86 | return (struct srp_target_port *) host->hostdata; | |
87 | } | |
88 | ||
89 | static const char *srp_target_info(struct Scsi_Host *host) | |
90 | { | |
91 | return host_to_target(host)->target_name; | |
92 | } | |
93 | ||
94 | static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, | |
95 | gfp_t gfp_mask, | |
96 | enum dma_data_direction direction) | |
97 | { | |
98 | struct srp_iu *iu; | |
99 | ||
100 | iu = kmalloc(sizeof *iu, gfp_mask); | |
101 | if (!iu) | |
102 | goto out; | |
103 | ||
104 | iu->buf = kzalloc(size, gfp_mask); | |
105 | if (!iu->buf) | |
106 | goto out_free_iu; | |
107 | ||
108 | iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction); | |
109 | if (dma_mapping_error(iu->dma)) | |
110 | goto out_free_buf; | |
111 | ||
112 | iu->size = size; | |
113 | iu->direction = direction; | |
114 | ||
115 | return iu; | |
116 | ||
117 | out_free_buf: | |
118 | kfree(iu->buf); | |
119 | out_free_iu: | |
120 | kfree(iu); | |
121 | out: | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) | |
126 | { | |
127 | if (!iu) | |
128 | return; | |
129 | ||
130 | dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction); | |
131 | kfree(iu->buf); | |
132 | kfree(iu); | |
133 | } | |
134 | ||
135 | static void srp_qp_event(struct ib_event *event, void *context) | |
136 | { | |
137 | printk(KERN_ERR PFX "QP event %d\n", event->event); | |
138 | } | |
139 | ||
140 | static int srp_init_qp(struct srp_target_port *target, | |
141 | struct ib_qp *qp) | |
142 | { | |
143 | struct ib_qp_attr *attr; | |
144 | int ret; | |
145 | ||
146 | attr = kmalloc(sizeof *attr, GFP_KERNEL); | |
147 | if (!attr) | |
148 | return -ENOMEM; | |
149 | ||
150 | ret = ib_find_cached_pkey(target->srp_host->dev, | |
151 | target->srp_host->port, | |
152 | be16_to_cpu(target->path.pkey), | |
153 | &attr->pkey_index); | |
154 | if (ret) | |
155 | goto out; | |
156 | ||
157 | attr->qp_state = IB_QPS_INIT; | |
158 | attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | | |
159 | IB_ACCESS_REMOTE_WRITE); | |
160 | attr->port_num = target->srp_host->port; | |
161 | ||
162 | ret = ib_modify_qp(qp, attr, | |
163 | IB_QP_STATE | | |
164 | IB_QP_PKEY_INDEX | | |
165 | IB_QP_ACCESS_FLAGS | | |
166 | IB_QP_PORT); | |
167 | ||
168 | out: | |
169 | kfree(attr); | |
170 | return ret; | |
171 | } | |
172 | ||
173 | static int srp_create_target_ib(struct srp_target_port *target) | |
174 | { | |
175 | struct ib_qp_init_attr *init_attr; | |
176 | int ret; | |
177 | ||
178 | init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); | |
179 | if (!init_attr) | |
180 | return -ENOMEM; | |
181 | ||
182 | target->cq = ib_create_cq(target->srp_host->dev, srp_completion, | |
183 | NULL, target, SRP_CQ_SIZE); | |
184 | if (IS_ERR(target->cq)) { | |
185 | ret = PTR_ERR(target->cq); | |
186 | goto out; | |
187 | } | |
188 | ||
189 | ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP); | |
190 | ||
191 | init_attr->event_handler = srp_qp_event; | |
192 | init_attr->cap.max_send_wr = SRP_SQ_SIZE; | |
193 | init_attr->cap.max_recv_wr = SRP_RQ_SIZE; | |
194 | init_attr->cap.max_recv_sge = 1; | |
195 | init_attr->cap.max_send_sge = 1; | |
196 | init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; | |
197 | init_attr->qp_type = IB_QPT_RC; | |
198 | init_attr->send_cq = target->cq; | |
199 | init_attr->recv_cq = target->cq; | |
200 | ||
201 | target->qp = ib_create_qp(target->srp_host->pd, init_attr); | |
202 | if (IS_ERR(target->qp)) { | |
203 | ret = PTR_ERR(target->qp); | |
204 | ib_destroy_cq(target->cq); | |
205 | goto out; | |
206 | } | |
207 | ||
208 | ret = srp_init_qp(target, target->qp); | |
209 | if (ret) { | |
210 | ib_destroy_qp(target->qp); | |
211 | ib_destroy_cq(target->cq); | |
212 | goto out; | |
213 | } | |
214 | ||
215 | out: | |
216 | kfree(init_attr); | |
217 | return ret; | |
218 | } | |
219 | ||
220 | static void srp_free_target_ib(struct srp_target_port *target) | |
221 | { | |
222 | int i; | |
223 | ||
224 | ib_destroy_qp(target->qp); | |
225 | ib_destroy_cq(target->cq); | |
226 | ||
227 | for (i = 0; i < SRP_RQ_SIZE; ++i) | |
228 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
229 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) | |
230 | srp_free_iu(target->srp_host, target->tx_ring[i]); | |
231 | } | |
232 | ||
233 | static void srp_path_rec_completion(int status, | |
234 | struct ib_sa_path_rec *pathrec, | |
235 | void *target_ptr) | |
236 | { | |
237 | struct srp_target_port *target = target_ptr; | |
238 | ||
239 | target->status = status; | |
240 | if (status) | |
241 | printk(KERN_ERR PFX "Got failed path rec status %d\n", status); | |
242 | else | |
243 | target->path = *pathrec; | |
244 | complete(&target->done); | |
245 | } | |
246 | ||
247 | static int srp_lookup_path(struct srp_target_port *target) | |
248 | { | |
249 | target->path.numb_path = 1; | |
250 | ||
251 | init_completion(&target->done); | |
252 | ||
253 | target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev, | |
254 | target->srp_host->port, | |
255 | &target->path, | |
256 | IB_SA_PATH_REC_DGID | | |
257 | IB_SA_PATH_REC_SGID | | |
258 | IB_SA_PATH_REC_NUMB_PATH | | |
259 | IB_SA_PATH_REC_PKEY, | |
260 | SRP_PATH_REC_TIMEOUT_MS, | |
261 | GFP_KERNEL, | |
262 | srp_path_rec_completion, | |
263 | target, &target->path_query); | |
264 | if (target->path_query_id < 0) | |
265 | return target->path_query_id; | |
266 | ||
267 | wait_for_completion(&target->done); | |
268 | ||
269 | if (target->status < 0) | |
270 | printk(KERN_WARNING PFX "Path record query failed\n"); | |
271 | ||
272 | return target->status; | |
273 | } | |
274 | ||
275 | static int srp_send_req(struct srp_target_port *target) | |
276 | { | |
277 | struct { | |
278 | struct ib_cm_req_param param; | |
279 | struct srp_login_req priv; | |
280 | } *req = NULL; | |
281 | int status; | |
282 | ||
283 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
284 | if (!req) | |
285 | return -ENOMEM; | |
286 | ||
287 | req->param.primary_path = &target->path; | |
288 | req->param.alternate_path = NULL; | |
289 | req->param.service_id = target->service_id; | |
290 | req->param.qp_num = target->qp->qp_num; | |
291 | req->param.qp_type = target->qp->qp_type; | |
292 | req->param.private_data = &req->priv; | |
293 | req->param.private_data_len = sizeof req->priv; | |
294 | req->param.flow_control = 1; | |
295 | ||
296 | get_random_bytes(&req->param.starting_psn, 4); | |
297 | req->param.starting_psn &= 0xffffff; | |
298 | ||
299 | /* | |
300 | * Pick some arbitrary defaults here; we could make these | |
301 | * module parameters if anyone cared about setting them. | |
302 | */ | |
303 | req->param.responder_resources = 4; | |
304 | req->param.remote_cm_response_timeout = 20; | |
305 | req->param.local_cm_response_timeout = 20; | |
306 | req->param.retry_count = 7; | |
307 | req->param.rnr_retry_count = 7; | |
308 | req->param.max_cm_retries = 15; | |
309 | ||
310 | req->priv.opcode = SRP_LOGIN_REQ; | |
311 | req->priv.tag = 0; | |
312 | req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
313 | req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | | |
314 | SRP_BUF_FORMAT_INDIRECT); | |
315 | memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16); | |
316 | /* | |
317 | * Topspin/Cisco SRP targets will reject our login unless we | |
318 | * zero out the first 8 bytes of our initiator port ID. The | |
319 | * second 8 bytes must be our local node GUID, but we always | |
320 | * use that anyway. | |
321 | */ | |
322 | if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) { | |
323 | printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround " | |
324 | "activated for target GUID %016llx\n", | |
325 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
326 | memset(req->priv.initiator_port_id, 0, 8); | |
327 | } | |
328 | memcpy(req->priv.target_port_id, &target->id_ext, 8); | |
329 | memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); | |
330 | ||
331 | status = ib_send_cm_req(target->cm_id, &req->param); | |
332 | ||
333 | kfree(req); | |
334 | ||
335 | return status; | |
336 | } | |
337 | ||
338 | static void srp_disconnect_target(struct srp_target_port *target) | |
339 | { | |
340 | /* XXX should send SRP_I_LOGOUT request */ | |
341 | ||
342 | init_completion(&target->done); | |
e6581056 RD |
343 | if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { |
344 | printk(KERN_DEBUG PFX "Sending CM DREQ failed\n"); | |
345 | return; | |
346 | } | |
aef9ec39 RD |
347 | wait_for_completion(&target->done); |
348 | } | |
349 | ||
350 | static void srp_remove_work(void *target_ptr) | |
351 | { | |
352 | struct srp_target_port *target = target_ptr; | |
353 | ||
354 | spin_lock_irq(target->scsi_host->host_lock); | |
355 | if (target->state != SRP_TARGET_DEAD) { | |
356 | spin_unlock_irq(target->scsi_host->host_lock); | |
aef9ec39 RD |
357 | return; |
358 | } | |
359 | target->state = SRP_TARGET_REMOVED; | |
360 | spin_unlock_irq(target->scsi_host->host_lock); | |
361 | ||
8e9e5f4f | 362 | mutex_lock(&target->srp_host->target_mutex); |
aef9ec39 | 363 | list_del(&target->list); |
8e9e5f4f | 364 | mutex_unlock(&target->srp_host->target_mutex); |
aef9ec39 RD |
365 | |
366 | scsi_remove_host(target->scsi_host); | |
367 | ib_destroy_cm_id(target->cm_id); | |
368 | srp_free_target_ib(target); | |
369 | scsi_host_put(target->scsi_host); | |
aef9ec39 RD |
370 | } |
371 | ||
372 | static int srp_connect_target(struct srp_target_port *target) | |
373 | { | |
374 | int ret; | |
375 | ||
376 | ret = srp_lookup_path(target); | |
377 | if (ret) | |
378 | return ret; | |
379 | ||
380 | while (1) { | |
381 | init_completion(&target->done); | |
382 | ret = srp_send_req(target); | |
383 | if (ret) | |
384 | return ret; | |
385 | wait_for_completion(&target->done); | |
386 | ||
387 | /* | |
388 | * The CM event handling code will set status to | |
389 | * SRP_PORT_REDIRECT if we get a port redirect REJ | |
390 | * back, or SRP_DLID_REDIRECT if we get a lid/qp | |
391 | * redirect REJ back. | |
392 | */ | |
393 | switch (target->status) { | |
394 | case 0: | |
395 | return 0; | |
396 | ||
397 | case SRP_PORT_REDIRECT: | |
398 | ret = srp_lookup_path(target); | |
399 | if (ret) | |
400 | return ret; | |
401 | break; | |
402 | ||
403 | case SRP_DLID_REDIRECT: | |
404 | break; | |
405 | ||
406 | default: | |
407 | return target->status; | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
d945e1df RD |
412 | static void srp_unmap_data(struct scsi_cmnd *scmnd, |
413 | struct srp_target_port *target, | |
414 | struct srp_request *req) | |
415 | { | |
416 | struct scatterlist *scat; | |
417 | int nents; | |
418 | ||
419 | if (!scmnd->request_buffer || | |
420 | (scmnd->sc_data_direction != DMA_TO_DEVICE && | |
421 | scmnd->sc_data_direction != DMA_FROM_DEVICE)) | |
422 | return; | |
423 | ||
424 | /* | |
425 | * This handling of non-SG commands can be killed when the | |
426 | * SCSI midlayer no longer generates non-SG commands. | |
427 | */ | |
428 | if (likely(scmnd->use_sg)) { | |
429 | nents = scmnd->use_sg; | |
430 | scat = scmnd->request_buffer; | |
431 | } else { | |
432 | nents = 1; | |
433 | scat = &req->fake_sg; | |
434 | } | |
435 | ||
436 | dma_unmap_sg(target->srp_host->dev->dma_device, scat, nents, | |
437 | scmnd->sc_data_direction); | |
438 | } | |
439 | ||
aef9ec39 RD |
440 | static int srp_reconnect_target(struct srp_target_port *target) |
441 | { | |
442 | struct ib_cm_id *new_cm_id; | |
443 | struct ib_qp_attr qp_attr; | |
444 | struct srp_request *req; | |
445 | struct ib_wc wc; | |
446 | int ret; | |
447 | int i; | |
448 | ||
449 | spin_lock_irq(target->scsi_host->host_lock); | |
450 | if (target->state != SRP_TARGET_LIVE) { | |
451 | spin_unlock_irq(target->scsi_host->host_lock); | |
452 | return -EAGAIN; | |
453 | } | |
454 | target->state = SRP_TARGET_CONNECTING; | |
455 | spin_unlock_irq(target->scsi_host->host_lock); | |
456 | ||
457 | srp_disconnect_target(target); | |
458 | /* | |
459 | * Now get a new local CM ID so that we avoid confusing the | |
460 | * target in case things are really fouled up. | |
461 | */ | |
462 | new_cm_id = ib_create_cm_id(target->srp_host->dev, | |
463 | srp_cm_handler, target); | |
464 | if (IS_ERR(new_cm_id)) { | |
465 | ret = PTR_ERR(new_cm_id); | |
466 | goto err; | |
467 | } | |
468 | ib_destroy_cm_id(target->cm_id); | |
469 | target->cm_id = new_cm_id; | |
470 | ||
471 | qp_attr.qp_state = IB_QPS_RESET; | |
472 | ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE); | |
473 | if (ret) | |
474 | goto err; | |
475 | ||
476 | ret = srp_init_qp(target, target->qp); | |
477 | if (ret) | |
478 | goto err; | |
479 | ||
480 | while (ib_poll_cq(target->cq, 1, &wc) > 0) | |
481 | ; /* nothing */ | |
482 | ||
483 | list_for_each_entry(req, &target->req_queue, list) { | |
484 | req->scmnd->result = DID_RESET << 16; | |
485 | req->scmnd->scsi_done(req->scmnd); | |
d945e1df | 486 | srp_unmap_data(req->scmnd, target, req); |
aef9ec39 RD |
487 | } |
488 | ||
489 | target->rx_head = 0; | |
490 | target->tx_head = 0; | |
491 | target->tx_tail = 0; | |
d945e1df | 492 | INIT_LIST_HEAD(&target->free_reqs); |
aef9ec39 | 493 | INIT_LIST_HEAD(&target->req_queue); |
d945e1df RD |
494 | for (i = 0; i < SRP_SQ_SIZE; ++i) |
495 | list_add_tail(&target->req_ring[i].list, &target->free_reqs); | |
aef9ec39 RD |
496 | |
497 | ret = srp_connect_target(target); | |
498 | if (ret) | |
499 | goto err; | |
500 | ||
501 | spin_lock_irq(target->scsi_host->host_lock); | |
502 | if (target->state == SRP_TARGET_CONNECTING) { | |
503 | ret = 0; | |
504 | target->state = SRP_TARGET_LIVE; | |
505 | } else | |
506 | ret = -EAGAIN; | |
507 | spin_unlock_irq(target->scsi_host->host_lock); | |
508 | ||
509 | return ret; | |
510 | ||
511 | err: | |
512 | printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret); | |
513 | ||
514 | /* | |
515 | * We couldn't reconnect, so kill our target port off. | |
516 | * However, we have to defer the real removal because we might | |
517 | * be in the context of the SCSI error handler now, which | |
518 | * would deadlock if we call scsi_remove_host(). | |
519 | */ | |
520 | spin_lock_irq(target->scsi_host->host_lock); | |
521 | if (target->state == SRP_TARGET_CONNECTING) { | |
522 | target->state = SRP_TARGET_DEAD; | |
523 | INIT_WORK(&target->work, srp_remove_work, target); | |
524 | schedule_work(&target->work); | |
525 | } | |
526 | spin_unlock_irq(target->scsi_host->host_lock); | |
527 | ||
528 | return ret; | |
529 | } | |
530 | ||
531 | static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, | |
532 | struct srp_request *req) | |
533 | { | |
cf368713 | 534 | struct scatterlist *scat; |
aef9ec39 | 535 | struct srp_cmd *cmd = req->cmd->buf; |
cf368713 RD |
536 | int len, nents, count; |
537 | int i; | |
aef9ec39 RD |
538 | u8 fmt; |
539 | ||
540 | if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE) | |
541 | return sizeof (struct srp_cmd); | |
542 | ||
543 | if (scmnd->sc_data_direction != DMA_FROM_DEVICE && | |
544 | scmnd->sc_data_direction != DMA_TO_DEVICE) { | |
545 | printk(KERN_WARNING PFX "Unhandled data direction %d\n", | |
546 | scmnd->sc_data_direction); | |
547 | return -EINVAL; | |
548 | } | |
549 | ||
cf368713 RD |
550 | /* |
551 | * This handling of non-SG commands can be killed when the | |
552 | * SCSI midlayer no longer generates non-SG commands. | |
553 | */ | |
554 | if (likely(scmnd->use_sg)) { | |
555 | nents = scmnd->use_sg; | |
556 | scat = scmnd->request_buffer; | |
557 | } else { | |
558 | nents = 1; | |
559 | scat = &req->fake_sg; | |
560 | sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen); | |
561 | } | |
aef9ec39 | 562 | |
cf368713 RD |
563 | count = dma_map_sg(target->srp_host->dev->dma_device, scat, nents, |
564 | scmnd->sc_data_direction); | |
aef9ec39 | 565 | |
cf368713 RD |
566 | if (count == 1) { |
567 | struct srp_direct_buf *buf = (void *) cmd->add_data; | |
aef9ec39 | 568 | |
cf368713 | 569 | fmt = SRP_DATA_DESC_DIRECT; |
aef9ec39 | 570 | |
cf368713 RD |
571 | buf->va = cpu_to_be64(sg_dma_address(scat)); |
572 | buf->key = cpu_to_be32(target->srp_host->mr->rkey); | |
573 | buf->len = cpu_to_be32(sg_dma_len(scat)); | |
aef9ec39 | 574 | |
cf368713 RD |
575 | len = sizeof (struct srp_cmd) + |
576 | sizeof (struct srp_direct_buf); | |
577 | } else { | |
578 | struct srp_indirect_buf *buf = (void *) cmd->add_data; | |
579 | u32 datalen = 0; | |
aef9ec39 | 580 | |
cf368713 | 581 | fmt = SRP_DATA_DESC_INDIRECT; |
aef9ec39 | 582 | |
cf368713 RD |
583 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) |
584 | cmd->data_out_desc_cnt = count; | |
585 | else | |
586 | cmd->data_in_desc_cnt = count; | |
587 | ||
588 | buf->table_desc.va = cpu_to_be64(req->cmd->dma + | |
589 | sizeof *cmd + | |
590 | sizeof *buf); | |
591 | buf->table_desc.key = | |
592 | cpu_to_be32(target->srp_host->mr->rkey); | |
593 | buf->table_desc.len = | |
594 | cpu_to_be32(count * sizeof (struct srp_direct_buf)); | |
595 | ||
596 | for (i = 0; i < count; ++i) { | |
597 | buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i])); | |
598 | buf->desc_list[i].key = | |
aef9ec39 | 599 | cpu_to_be32(target->srp_host->mr->rkey); |
cf368713 | 600 | buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i])); |
aef9ec39 | 601 | |
cf368713 | 602 | datalen += sg_dma_len(&scat[i]); |
aef9ec39 RD |
603 | } |
604 | ||
cf368713 | 605 | buf->len = cpu_to_be32(datalen); |
aef9ec39 | 606 | |
cf368713 RD |
607 | len = sizeof (struct srp_cmd) + |
608 | sizeof (struct srp_indirect_buf) + | |
609 | count * sizeof (struct srp_direct_buf); | |
aef9ec39 RD |
610 | } |
611 | ||
612 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) | |
613 | cmd->buf_fmt = fmt << 4; | |
614 | else | |
615 | cmd->buf_fmt = fmt; | |
616 | ||
aef9ec39 RD |
617 | return len; |
618 | } | |
619 | ||
d945e1df | 620 | static void srp_remove_req(struct srp_target_port *target, struct srp_request *req) |
f80887d0 | 621 | { |
d945e1df RD |
622 | srp_unmap_data(req->scmnd, target, req); |
623 | list_move_tail(&req->list, &target->free_reqs); | |
f80887d0 RD |
624 | } |
625 | ||
aef9ec39 RD |
626 | static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) |
627 | { | |
628 | struct srp_request *req; | |
629 | struct scsi_cmnd *scmnd; | |
630 | unsigned long flags; | |
631 | s32 delta; | |
632 | ||
633 | delta = (s32) be32_to_cpu(rsp->req_lim_delta); | |
634 | ||
635 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
636 | ||
637 | target->req_lim += delta; | |
638 | ||
639 | req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT]; | |
640 | ||
641 | if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { | |
642 | if (be32_to_cpu(rsp->resp_data_len) < 4) | |
643 | req->tsk_status = -1; | |
644 | else | |
645 | req->tsk_status = rsp->data[3]; | |
646 | complete(&req->done); | |
647 | } else { | |
d945e1df | 648 | scmnd = req->scmnd; |
aef9ec39 RD |
649 | if (!scmnd) |
650 | printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n", | |
651 | (unsigned long long) rsp->tag); | |
652 | scmnd->result = rsp->status; | |
653 | ||
654 | if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { | |
655 | memcpy(scmnd->sense_buffer, rsp->data + | |
656 | be32_to_cpu(rsp->resp_data_len), | |
657 | min_t(int, be32_to_cpu(rsp->sense_data_len), | |
658 | SCSI_SENSE_BUFFERSIZE)); | |
659 | } | |
660 | ||
661 | if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) | |
662 | scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt); | |
663 | else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) | |
664 | scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt); | |
665 | ||
aef9ec39 | 666 | if (!req->tsk_mgmt) { |
aef9ec39 RD |
667 | scmnd->host_scribble = (void *) -1L; |
668 | scmnd->scsi_done(scmnd); | |
669 | ||
d945e1df | 670 | srp_remove_req(target, req); |
aef9ec39 RD |
671 | } else |
672 | req->cmd_done = 1; | |
673 | } | |
674 | ||
675 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
676 | } | |
677 | ||
678 | static void srp_reconnect_work(void *target_ptr) | |
679 | { | |
680 | struct srp_target_port *target = target_ptr; | |
681 | ||
682 | srp_reconnect_target(target); | |
683 | } | |
684 | ||
685 | static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) | |
686 | { | |
687 | struct srp_iu *iu; | |
688 | u8 opcode; | |
689 | ||
690 | iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV]; | |
691 | ||
692 | dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma, | |
693 | target->max_ti_iu_len, DMA_FROM_DEVICE); | |
694 | ||
695 | opcode = *(u8 *) iu->buf; | |
696 | ||
697 | if (0) { | |
698 | int i; | |
699 | ||
700 | printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode); | |
701 | ||
702 | for (i = 0; i < wc->byte_len; ++i) { | |
703 | if (i % 8 == 0) | |
704 | printk(KERN_ERR " [%02x] ", i); | |
705 | printk(" %02x", ((u8 *) iu->buf)[i]); | |
706 | if ((i + 1) % 8 == 0) | |
707 | printk("\n"); | |
708 | } | |
709 | ||
710 | if (wc->byte_len % 8) | |
711 | printk("\n"); | |
712 | } | |
713 | ||
714 | switch (opcode) { | |
715 | case SRP_RSP: | |
716 | srp_process_rsp(target, iu->buf); | |
717 | break; | |
718 | ||
719 | case SRP_T_LOGOUT: | |
720 | /* XXX Handle target logout */ | |
721 | printk(KERN_WARNING PFX "Got target logout request\n"); | |
722 | break; | |
723 | ||
724 | default: | |
725 | printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode); | |
726 | break; | |
727 | } | |
728 | ||
729 | dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma, | |
730 | target->max_ti_iu_len, DMA_FROM_DEVICE); | |
731 | } | |
732 | ||
733 | static void srp_completion(struct ib_cq *cq, void *target_ptr) | |
734 | { | |
735 | struct srp_target_port *target = target_ptr; | |
736 | struct ib_wc wc; | |
737 | unsigned long flags; | |
738 | ||
739 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
740 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
741 | if (wc.status) { | |
742 | printk(KERN_ERR PFX "failed %s status %d\n", | |
743 | wc.wr_id & SRP_OP_RECV ? "receive" : "send", | |
744 | wc.status); | |
745 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
746 | if (target->state == SRP_TARGET_LIVE) | |
747 | schedule_work(&target->work); | |
748 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
749 | break; | |
750 | } | |
751 | ||
752 | if (wc.wr_id & SRP_OP_RECV) | |
753 | srp_handle_recv(target, &wc); | |
754 | else | |
755 | ++target->tx_tail; | |
756 | } | |
757 | } | |
758 | ||
759 | static int __srp_post_recv(struct srp_target_port *target) | |
760 | { | |
761 | struct srp_iu *iu; | |
762 | struct ib_sge list; | |
763 | struct ib_recv_wr wr, *bad_wr; | |
764 | unsigned int next; | |
765 | int ret; | |
766 | ||
767 | next = target->rx_head & (SRP_RQ_SIZE - 1); | |
768 | wr.wr_id = next | SRP_OP_RECV; | |
769 | iu = target->rx_ring[next]; | |
770 | ||
771 | list.addr = iu->dma; | |
772 | list.length = iu->size; | |
773 | list.lkey = target->srp_host->mr->lkey; | |
774 | ||
775 | wr.next = NULL; | |
776 | wr.sg_list = &list; | |
777 | wr.num_sge = 1; | |
778 | ||
779 | ret = ib_post_recv(target->qp, &wr, &bad_wr); | |
780 | if (!ret) | |
781 | ++target->rx_head; | |
782 | ||
783 | return ret; | |
784 | } | |
785 | ||
786 | static int srp_post_recv(struct srp_target_port *target) | |
787 | { | |
788 | unsigned long flags; | |
789 | int ret; | |
790 | ||
791 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
792 | ret = __srp_post_recv(target); | |
793 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
794 | ||
795 | return ret; | |
796 | } | |
797 | ||
798 | /* | |
799 | * Must be called with target->scsi_host->host_lock held to protect | |
47f2bce9 RD |
800 | * req_lim and tx_head. Lock cannot be dropped between call here and |
801 | * call to __srp_post_send(). | |
aef9ec39 RD |
802 | */ |
803 | static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target) | |
804 | { | |
805 | if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE) | |
806 | return NULL; | |
807 | ||
47f2bce9 RD |
808 | if (unlikely(target->req_lim < 1)) { |
809 | if (printk_ratelimit()) | |
810 | printk(KERN_DEBUG PFX "Target has req_lim %d\n", | |
811 | target->req_lim); | |
812 | return NULL; | |
813 | } | |
814 | ||
aef9ec39 RD |
815 | return target->tx_ring[target->tx_head & SRP_SQ_SIZE]; |
816 | } | |
817 | ||
818 | /* | |
819 | * Must be called with target->scsi_host->host_lock held to protect | |
820 | * req_lim and tx_head. | |
821 | */ | |
822 | static int __srp_post_send(struct srp_target_port *target, | |
823 | struct srp_iu *iu, int len) | |
824 | { | |
825 | struct ib_sge list; | |
826 | struct ib_send_wr wr, *bad_wr; | |
827 | int ret = 0; | |
828 | ||
aef9ec39 RD |
829 | list.addr = iu->dma; |
830 | list.length = len; | |
831 | list.lkey = target->srp_host->mr->lkey; | |
832 | ||
833 | wr.next = NULL; | |
834 | wr.wr_id = target->tx_head & SRP_SQ_SIZE; | |
835 | wr.sg_list = &list; | |
836 | wr.num_sge = 1; | |
837 | wr.opcode = IB_WR_SEND; | |
838 | wr.send_flags = IB_SEND_SIGNALED; | |
839 | ||
840 | ret = ib_post_send(target->qp, &wr, &bad_wr); | |
841 | ||
842 | if (!ret) { | |
843 | ++target->tx_head; | |
844 | --target->req_lim; | |
845 | } | |
846 | ||
847 | return ret; | |
848 | } | |
849 | ||
850 | static int srp_queuecommand(struct scsi_cmnd *scmnd, | |
851 | void (*done)(struct scsi_cmnd *)) | |
852 | { | |
853 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
854 | struct srp_request *req; | |
855 | struct srp_iu *iu; | |
856 | struct srp_cmd *cmd; | |
aef9ec39 RD |
857 | int len; |
858 | ||
859 | if (target->state == SRP_TARGET_CONNECTING) | |
860 | goto err; | |
861 | ||
862 | if (target->state == SRP_TARGET_DEAD || | |
863 | target->state == SRP_TARGET_REMOVED) { | |
864 | scmnd->result = DID_BAD_TARGET << 16; | |
865 | done(scmnd); | |
866 | return 0; | |
867 | } | |
868 | ||
869 | iu = __srp_get_tx_iu(target); | |
870 | if (!iu) | |
871 | goto err; | |
872 | ||
873 | dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma, | |
874 | SRP_MAX_IU_LEN, DMA_TO_DEVICE); | |
875 | ||
d945e1df | 876 | req = list_entry(target->free_reqs.next, struct srp_request, list); |
aef9ec39 RD |
877 | |
878 | scmnd->scsi_done = done; | |
879 | scmnd->result = 0; | |
d945e1df | 880 | scmnd->host_scribble = (void *) (long) req->index; |
aef9ec39 RD |
881 | |
882 | cmd = iu->buf; | |
883 | memset(cmd, 0, sizeof *cmd); | |
884 | ||
885 | cmd->opcode = SRP_CMD; | |
886 | cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); | |
d945e1df | 887 | cmd->tag = req->index; |
aef9ec39 RD |
888 | memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); |
889 | ||
aef9ec39 RD |
890 | req->scmnd = scmnd; |
891 | req->cmd = iu; | |
892 | req->cmd_done = 0; | |
893 | req->tsk_mgmt = NULL; | |
894 | ||
895 | len = srp_map_data(scmnd, target, req); | |
896 | if (len < 0) { | |
897 | printk(KERN_ERR PFX "Failed to map data\n"); | |
898 | goto err; | |
899 | } | |
900 | ||
901 | if (__srp_post_recv(target)) { | |
902 | printk(KERN_ERR PFX "Recv failed\n"); | |
903 | goto err_unmap; | |
904 | } | |
905 | ||
906 | dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma, | |
907 | SRP_MAX_IU_LEN, DMA_TO_DEVICE); | |
908 | ||
909 | if (__srp_post_send(target, iu, len)) { | |
910 | printk(KERN_ERR PFX "Send failed\n"); | |
911 | goto err_unmap; | |
912 | } | |
913 | ||
d945e1df | 914 | list_move_tail(&req->list, &target->req_queue); |
aef9ec39 RD |
915 | |
916 | return 0; | |
917 | ||
918 | err_unmap: | |
919 | srp_unmap_data(scmnd, target, req); | |
920 | ||
921 | err: | |
922 | return SCSI_MLQUEUE_HOST_BUSY; | |
923 | } | |
924 | ||
925 | static int srp_alloc_iu_bufs(struct srp_target_port *target) | |
926 | { | |
927 | int i; | |
928 | ||
929 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
930 | target->rx_ring[i] = srp_alloc_iu(target->srp_host, | |
931 | target->max_ti_iu_len, | |
932 | GFP_KERNEL, DMA_FROM_DEVICE); | |
933 | if (!target->rx_ring[i]) | |
934 | goto err; | |
935 | } | |
936 | ||
937 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) { | |
938 | target->tx_ring[i] = srp_alloc_iu(target->srp_host, | |
939 | SRP_MAX_IU_LEN, | |
940 | GFP_KERNEL, DMA_TO_DEVICE); | |
941 | if (!target->tx_ring[i]) | |
942 | goto err; | |
943 | } | |
944 | ||
945 | return 0; | |
946 | ||
947 | err: | |
948 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
949 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
950 | target->rx_ring[i] = NULL; | |
951 | } | |
952 | ||
953 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) { | |
954 | srp_free_iu(target->srp_host, target->tx_ring[i]); | |
955 | target->tx_ring[i] = NULL; | |
956 | } | |
957 | ||
958 | return -ENOMEM; | |
959 | } | |
960 | ||
961 | static void srp_cm_rej_handler(struct ib_cm_id *cm_id, | |
962 | struct ib_cm_event *event, | |
963 | struct srp_target_port *target) | |
964 | { | |
965 | struct ib_class_port_info *cpi; | |
966 | int opcode; | |
967 | ||
968 | switch (event->param.rej_rcvd.reason) { | |
969 | case IB_CM_REJ_PORT_CM_REDIRECT: | |
970 | cpi = event->param.rej_rcvd.ari; | |
971 | target->path.dlid = cpi->redirect_lid; | |
972 | target->path.pkey = cpi->redirect_pkey; | |
973 | cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; | |
974 | memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); | |
975 | ||
976 | target->status = target->path.dlid ? | |
977 | SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; | |
978 | break; | |
979 | ||
980 | case IB_CM_REJ_PORT_REDIRECT: | |
981 | if (topspin_workarounds && | |
982 | !memcmp(&target->ioc_guid, topspin_oui, 3)) { | |
983 | /* | |
984 | * Topspin/Cisco SRP gateways incorrectly send | |
985 | * reject reason code 25 when they mean 24 | |
986 | * (port redirect). | |
987 | */ | |
988 | memcpy(target->path.dgid.raw, | |
989 | event->param.rej_rcvd.ari, 16); | |
990 | ||
991 | printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", | |
992 | (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), | |
993 | (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); | |
994 | ||
995 | target->status = SRP_PORT_REDIRECT; | |
996 | } else { | |
997 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); | |
998 | target->status = -ECONNRESET; | |
999 | } | |
1000 | break; | |
1001 | ||
1002 | case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: | |
1003 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); | |
1004 | target->status = -ECONNRESET; | |
1005 | break; | |
1006 | ||
1007 | case IB_CM_REJ_CONSUMER_DEFINED: | |
1008 | opcode = *(u8 *) event->private_data; | |
1009 | if (opcode == SRP_LOGIN_REJ) { | |
1010 | struct srp_login_rej *rej = event->private_data; | |
1011 | u32 reason = be32_to_cpu(rej->reason); | |
1012 | ||
1013 | if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) | |
1014 | printk(KERN_WARNING PFX | |
1015 | "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); | |
1016 | else | |
1017 | printk(KERN_WARNING PFX | |
1018 | "SRP LOGIN REJECTED, reason 0x%08x\n", reason); | |
1019 | } else | |
1020 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," | |
1021 | " opcode 0x%02x\n", opcode); | |
1022 | target->status = -ECONNRESET; | |
1023 | break; | |
1024 | ||
1025 | default: | |
1026 | printk(KERN_WARNING " REJ reason 0x%x\n", | |
1027 | event->param.rej_rcvd.reason); | |
1028 | target->status = -ECONNRESET; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
1033 | { | |
1034 | struct srp_target_port *target = cm_id->context; | |
1035 | struct ib_qp_attr *qp_attr = NULL; | |
1036 | int attr_mask = 0; | |
1037 | int comp = 0; | |
1038 | int opcode = 0; | |
1039 | ||
1040 | switch (event->event) { | |
1041 | case IB_CM_REQ_ERROR: | |
1042 | printk(KERN_DEBUG PFX "Sending CM REQ failed\n"); | |
1043 | comp = 1; | |
1044 | target->status = -ECONNRESET; | |
1045 | break; | |
1046 | ||
1047 | case IB_CM_REP_RECEIVED: | |
1048 | comp = 1; | |
1049 | opcode = *(u8 *) event->private_data; | |
1050 | ||
1051 | if (opcode == SRP_LOGIN_RSP) { | |
1052 | struct srp_login_rsp *rsp = event->private_data; | |
1053 | ||
1054 | target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len); | |
1055 | target->req_lim = be32_to_cpu(rsp->req_lim_delta); | |
1056 | ||
1057 | target->scsi_host->can_queue = min(target->req_lim, | |
1058 | target->scsi_host->can_queue); | |
1059 | } else { | |
1060 | printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode); | |
1061 | target->status = -ECONNRESET; | |
1062 | break; | |
1063 | } | |
1064 | ||
1065 | target->status = srp_alloc_iu_bufs(target); | |
1066 | if (target->status) | |
1067 | break; | |
1068 | ||
1069 | qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); | |
1070 | if (!qp_attr) { | |
1071 | target->status = -ENOMEM; | |
1072 | break; | |
1073 | } | |
1074 | ||
1075 | qp_attr->qp_state = IB_QPS_RTR; | |
1076 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1077 | if (target->status) | |
1078 | break; | |
1079 | ||
1080 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1081 | if (target->status) | |
1082 | break; | |
1083 | ||
1084 | target->status = srp_post_recv(target); | |
1085 | if (target->status) | |
1086 | break; | |
1087 | ||
1088 | qp_attr->qp_state = IB_QPS_RTS; | |
1089 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1090 | if (target->status) | |
1091 | break; | |
1092 | ||
1093 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1094 | if (target->status) | |
1095 | break; | |
1096 | ||
1097 | target->status = ib_send_cm_rtu(cm_id, NULL, 0); | |
1098 | if (target->status) | |
1099 | break; | |
1100 | ||
1101 | break; | |
1102 | ||
1103 | case IB_CM_REJ_RECEIVED: | |
1104 | printk(KERN_DEBUG PFX "REJ received\n"); | |
1105 | comp = 1; | |
1106 | ||
1107 | srp_cm_rej_handler(cm_id, event, target); | |
1108 | break; | |
1109 | ||
1110 | case IB_CM_MRA_RECEIVED: | |
1111 | printk(KERN_ERR PFX "MRA received\n"); | |
1112 | break; | |
1113 | ||
1114 | case IB_CM_DREP_RECEIVED: | |
1115 | break; | |
1116 | ||
1117 | case IB_CM_TIMEWAIT_EXIT: | |
1118 | printk(KERN_ERR PFX "connection closed\n"); | |
1119 | ||
1120 | comp = 1; | |
1121 | target->status = 0; | |
1122 | break; | |
1123 | ||
1124 | default: | |
1125 | printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event); | |
1126 | break; | |
1127 | } | |
1128 | ||
1129 | if (comp) | |
1130 | complete(&target->done); | |
1131 | ||
1132 | kfree(qp_attr); | |
1133 | ||
1134 | return 0; | |
1135 | } | |
1136 | ||
d945e1df RD |
1137 | static int srp_send_tsk_mgmt(struct srp_target_port *target, |
1138 | struct srp_request *req, u8 func) | |
aef9ec39 | 1139 | { |
aef9ec39 RD |
1140 | struct srp_iu *iu; |
1141 | struct srp_tsk_mgmt *tsk_mgmt; | |
aef9ec39 RD |
1142 | |
1143 | spin_lock_irq(target->scsi_host->host_lock); | |
1144 | ||
1285b3a0 RD |
1145 | if (target->state == SRP_TARGET_DEAD || |
1146 | target->state == SRP_TARGET_REMOVED) { | |
d945e1df | 1147 | req->scmnd->result = DID_BAD_TARGET << 16; |
1285b3a0 RD |
1148 | goto out; |
1149 | } | |
1150 | ||
aef9ec39 RD |
1151 | init_completion(&req->done); |
1152 | ||
1153 | iu = __srp_get_tx_iu(target); | |
1154 | if (!iu) | |
1155 | goto out; | |
1156 | ||
1157 | tsk_mgmt = iu->buf; | |
1158 | memset(tsk_mgmt, 0, sizeof *tsk_mgmt); | |
1159 | ||
1160 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
d945e1df RD |
1161 | tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48); |
1162 | tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT; | |
aef9ec39 | 1163 | tsk_mgmt->tsk_mgmt_func = func; |
d945e1df | 1164 | tsk_mgmt->task_tag = req->index; |
aef9ec39 RD |
1165 | |
1166 | if (__srp_post_send(target, iu, sizeof *tsk_mgmt)) | |
1167 | goto out; | |
1168 | ||
1169 | req->tsk_mgmt = iu; | |
1170 | ||
1171 | spin_unlock_irq(target->scsi_host->host_lock); | |
d945e1df | 1172 | |
aef9ec39 RD |
1173 | if (!wait_for_completion_timeout(&req->done, |
1174 | msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) | |
d945e1df | 1175 | return -1; |
aef9ec39 | 1176 | |
d945e1df | 1177 | return 0; |
aef9ec39 RD |
1178 | |
1179 | out: | |
1180 | spin_unlock_irq(target->scsi_host->host_lock); | |
d945e1df RD |
1181 | return -1; |
1182 | } | |
1183 | ||
1184 | static int srp_find_req(struct srp_target_port *target, | |
1185 | struct scsi_cmnd *scmnd, | |
1186 | struct srp_request **req) | |
1187 | { | |
1188 | if (scmnd->host_scribble == (void *) -1L) | |
1189 | return -1; | |
1190 | ||
1191 | *req = &target->req_ring[(long) scmnd->host_scribble]; | |
1192 | ||
1193 | return 0; | |
aef9ec39 RD |
1194 | } |
1195 | ||
1196 | static int srp_abort(struct scsi_cmnd *scmnd) | |
1197 | { | |
d945e1df RD |
1198 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
1199 | struct srp_request *req; | |
1200 | int ret = SUCCESS; | |
1201 | ||
aef9ec39 RD |
1202 | printk(KERN_ERR "SRP abort called\n"); |
1203 | ||
d945e1df RD |
1204 | if (srp_find_req(target, scmnd, &req)) |
1205 | return FAILED; | |
1206 | if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK)) | |
1207 | return FAILED; | |
1208 | ||
1209 | spin_lock_irq(target->scsi_host->host_lock); | |
1210 | ||
1211 | if (req->cmd_done) { | |
1212 | srp_remove_req(target, req); | |
1213 | scmnd->scsi_done(scmnd); | |
1214 | } else if (!req->tsk_status) { | |
1215 | srp_remove_req(target, req); | |
1216 | scmnd->result = DID_ABORT << 16; | |
1217 | } else | |
1218 | ret = FAILED; | |
1219 | ||
1220 | spin_unlock_irq(target->scsi_host->host_lock); | |
1221 | ||
1222 | return ret; | |
aef9ec39 RD |
1223 | } |
1224 | ||
1225 | static int srp_reset_device(struct scsi_cmnd *scmnd) | |
1226 | { | |
d945e1df RD |
1227 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
1228 | struct srp_request *req, *tmp; | |
1229 | ||
aef9ec39 RD |
1230 | printk(KERN_ERR "SRP reset_device called\n"); |
1231 | ||
d945e1df RD |
1232 | if (srp_find_req(target, scmnd, &req)) |
1233 | return FAILED; | |
1234 | if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET)) | |
1235 | return FAILED; | |
1236 | if (req->tsk_status) | |
1237 | return FAILED; | |
1238 | ||
1239 | spin_lock_irq(target->scsi_host->host_lock); | |
1240 | ||
1241 | list_for_each_entry_safe(req, tmp, &target->req_queue, list) | |
1242 | if (req->scmnd->device == scmnd->device) { | |
1243 | req->scmnd->result = DID_RESET << 16; | |
093beac1 | 1244 | req->scmnd->scsi_done(req->scmnd); |
d945e1df RD |
1245 | srp_remove_req(target, req); |
1246 | } | |
1247 | ||
1248 | spin_unlock_irq(target->scsi_host->host_lock); | |
1249 | ||
1250 | return SUCCESS; | |
aef9ec39 RD |
1251 | } |
1252 | ||
1253 | static int srp_reset_host(struct scsi_cmnd *scmnd) | |
1254 | { | |
1255 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
1256 | int ret = FAILED; | |
1257 | ||
1258 | printk(KERN_ERR PFX "SRP reset_host called\n"); | |
1259 | ||
1260 | if (!srp_reconnect_target(target)) | |
1261 | ret = SUCCESS; | |
1262 | ||
1263 | return ret; | |
1264 | } | |
1265 | ||
6ecb0c84 RD |
1266 | static ssize_t show_id_ext(struct class_device *cdev, char *buf) |
1267 | { | |
1268 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1269 | ||
1270 | if (target->state == SRP_TARGET_DEAD || | |
1271 | target->state == SRP_TARGET_REMOVED) | |
1272 | return -ENODEV; | |
1273 | ||
1274 | return sprintf(buf, "0x%016llx\n", | |
1275 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1276 | } | |
1277 | ||
1278 | static ssize_t show_ioc_guid(struct class_device *cdev, char *buf) | |
1279 | { | |
1280 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1281 | ||
1282 | if (target->state == SRP_TARGET_DEAD || | |
1283 | target->state == SRP_TARGET_REMOVED) | |
1284 | return -ENODEV; | |
1285 | ||
1286 | return sprintf(buf, "0x%016llx\n", | |
1287 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
1288 | } | |
1289 | ||
1290 | static ssize_t show_service_id(struct class_device *cdev, char *buf) | |
1291 | { | |
1292 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1293 | ||
1294 | if (target->state == SRP_TARGET_DEAD || | |
1295 | target->state == SRP_TARGET_REMOVED) | |
1296 | return -ENODEV; | |
1297 | ||
1298 | return sprintf(buf, "0x%016llx\n", | |
1299 | (unsigned long long) be64_to_cpu(target->service_id)); | |
1300 | } | |
1301 | ||
1302 | static ssize_t show_pkey(struct class_device *cdev, char *buf) | |
1303 | { | |
1304 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1305 | ||
1306 | if (target->state == SRP_TARGET_DEAD || | |
1307 | target->state == SRP_TARGET_REMOVED) | |
1308 | return -ENODEV; | |
1309 | ||
1310 | return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); | |
1311 | } | |
1312 | ||
1313 | static ssize_t show_dgid(struct class_device *cdev, char *buf) | |
1314 | { | |
1315 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1316 | ||
1317 | if (target->state == SRP_TARGET_DEAD || | |
1318 | target->state == SRP_TARGET_REMOVED) | |
1319 | return -ENODEV; | |
1320 | ||
1321 | return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
1322 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]), | |
1323 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]), | |
1324 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]), | |
1325 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]), | |
1326 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]), | |
1327 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]), | |
1328 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]), | |
1329 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[7])); | |
1330 | } | |
1331 | ||
1332 | static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); | |
1333 | static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); | |
1334 | static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); | |
1335 | static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); | |
1336 | static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); | |
1337 | ||
1338 | static struct class_device_attribute *srp_host_attrs[] = { | |
1339 | &class_device_attr_id_ext, | |
1340 | &class_device_attr_ioc_guid, | |
1341 | &class_device_attr_service_id, | |
1342 | &class_device_attr_pkey, | |
1343 | &class_device_attr_dgid, | |
1344 | NULL | |
1345 | }; | |
1346 | ||
aef9ec39 RD |
1347 | static struct scsi_host_template srp_template = { |
1348 | .module = THIS_MODULE, | |
1349 | .name = DRV_NAME, | |
1350 | .info = srp_target_info, | |
1351 | .queuecommand = srp_queuecommand, | |
1352 | .eh_abort_handler = srp_abort, | |
1353 | .eh_device_reset_handler = srp_reset_device, | |
1354 | .eh_host_reset_handler = srp_reset_host, | |
1355 | .can_queue = SRP_SQ_SIZE, | |
1356 | .this_id = -1, | |
1357 | .sg_tablesize = SRP_MAX_INDIRECT, | |
1358 | .cmd_per_lun = SRP_SQ_SIZE, | |
6ecb0c84 RD |
1359 | .use_clustering = ENABLE_CLUSTERING, |
1360 | .shost_attrs = srp_host_attrs | |
aef9ec39 RD |
1361 | }; |
1362 | ||
1363 | static int srp_add_target(struct srp_host *host, struct srp_target_port *target) | |
1364 | { | |
1365 | sprintf(target->target_name, "SRP.T10:%016llX", | |
1366 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1367 | ||
1368 | if (scsi_add_host(target->scsi_host, host->dev->dma_device)) | |
1369 | return -ENODEV; | |
1370 | ||
8e9e5f4f | 1371 | mutex_lock(&host->target_mutex); |
aef9ec39 | 1372 | list_add_tail(&target->list, &host->target_list); |
8e9e5f4f | 1373 | mutex_unlock(&host->target_mutex); |
aef9ec39 RD |
1374 | |
1375 | target->state = SRP_TARGET_LIVE; | |
1376 | ||
1377 | /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */ | |
1378 | scsi_scan_target(&target->scsi_host->shost_gendev, | |
1379 | 0, target->scsi_id, ~0, 0); | |
1380 | ||
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | static void srp_release_class_dev(struct class_device *class_dev) | |
1385 | { | |
1386 | struct srp_host *host = | |
1387 | container_of(class_dev, struct srp_host, class_dev); | |
1388 | ||
1389 | complete(&host->released); | |
1390 | } | |
1391 | ||
1392 | static struct class srp_class = { | |
1393 | .name = "infiniband_srp", | |
1394 | .release = srp_release_class_dev | |
1395 | }; | |
1396 | ||
1397 | /* | |
1398 | * Target ports are added by writing | |
1399 | * | |
1400 | * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, | |
1401 | * pkey=<P_Key>,service_id=<service ID> | |
1402 | * | |
1403 | * to the add_target sysfs attribute. | |
1404 | */ | |
1405 | enum { | |
1406 | SRP_OPT_ERR = 0, | |
1407 | SRP_OPT_ID_EXT = 1 << 0, | |
1408 | SRP_OPT_IOC_GUID = 1 << 1, | |
1409 | SRP_OPT_DGID = 1 << 2, | |
1410 | SRP_OPT_PKEY = 1 << 3, | |
1411 | SRP_OPT_SERVICE_ID = 1 << 4, | |
1412 | SRP_OPT_MAX_SECT = 1 << 5, | |
1413 | SRP_OPT_ALL = (SRP_OPT_ID_EXT | | |
1414 | SRP_OPT_IOC_GUID | | |
1415 | SRP_OPT_DGID | | |
1416 | SRP_OPT_PKEY | | |
1417 | SRP_OPT_SERVICE_ID), | |
1418 | }; | |
1419 | ||
1420 | static match_table_t srp_opt_tokens = { | |
1421 | { SRP_OPT_ID_EXT, "id_ext=%s" }, | |
1422 | { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, | |
1423 | { SRP_OPT_DGID, "dgid=%s" }, | |
1424 | { SRP_OPT_PKEY, "pkey=%x" }, | |
1425 | { SRP_OPT_SERVICE_ID, "service_id=%s" }, | |
1426 | { SRP_OPT_MAX_SECT, "max_sect=%d" }, | |
1427 | { SRP_OPT_ERR, NULL } | |
1428 | }; | |
1429 | ||
1430 | static int srp_parse_options(const char *buf, struct srp_target_port *target) | |
1431 | { | |
1432 | char *options, *sep_opt; | |
1433 | char *p; | |
1434 | char dgid[3]; | |
1435 | substring_t args[MAX_OPT_ARGS]; | |
1436 | int opt_mask = 0; | |
1437 | int token; | |
1438 | int ret = -EINVAL; | |
1439 | int i; | |
1440 | ||
1441 | options = kstrdup(buf, GFP_KERNEL); | |
1442 | if (!options) | |
1443 | return -ENOMEM; | |
1444 | ||
1445 | sep_opt = options; | |
1446 | while ((p = strsep(&sep_opt, ",")) != NULL) { | |
1447 | if (!*p) | |
1448 | continue; | |
1449 | ||
1450 | token = match_token(p, srp_opt_tokens, args); | |
1451 | opt_mask |= token; | |
1452 | ||
1453 | switch (token) { | |
1454 | case SRP_OPT_ID_EXT: | |
1455 | p = match_strdup(args); | |
1456 | target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1457 | kfree(p); | |
1458 | break; | |
1459 | ||
1460 | case SRP_OPT_IOC_GUID: | |
1461 | p = match_strdup(args); | |
1462 | target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1463 | kfree(p); | |
1464 | break; | |
1465 | ||
1466 | case SRP_OPT_DGID: | |
1467 | p = match_strdup(args); | |
1468 | if (strlen(p) != 32) { | |
1469 | printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p); | |
ce1823f0 | 1470 | kfree(p); |
aef9ec39 RD |
1471 | goto out; |
1472 | } | |
1473 | ||
1474 | for (i = 0; i < 16; ++i) { | |
1475 | strlcpy(dgid, p + i * 2, 3); | |
1476 | target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); | |
1477 | } | |
bf17c1c7 | 1478 | kfree(p); |
aef9ec39 RD |
1479 | break; |
1480 | ||
1481 | case SRP_OPT_PKEY: | |
1482 | if (match_hex(args, &token)) { | |
1483 | printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p); | |
1484 | goto out; | |
1485 | } | |
1486 | target->path.pkey = cpu_to_be16(token); | |
1487 | break; | |
1488 | ||
1489 | case SRP_OPT_SERVICE_ID: | |
1490 | p = match_strdup(args); | |
1491 | target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1492 | kfree(p); | |
1493 | break; | |
1494 | ||
1495 | case SRP_OPT_MAX_SECT: | |
1496 | if (match_int(args, &token)) { | |
1497 | printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p); | |
1498 | goto out; | |
1499 | } | |
1500 | target->scsi_host->max_sectors = token; | |
1501 | break; | |
1502 | ||
1503 | default: | |
1504 | printk(KERN_WARNING PFX "unknown parameter or missing value " | |
1505 | "'%s' in target creation request\n", p); | |
1506 | goto out; | |
1507 | } | |
1508 | } | |
1509 | ||
1510 | if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) | |
1511 | ret = 0; | |
1512 | else | |
1513 | for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) | |
1514 | if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && | |
1515 | !(srp_opt_tokens[i].token & opt_mask)) | |
1516 | printk(KERN_WARNING PFX "target creation request is " | |
1517 | "missing parameter '%s'\n", | |
1518 | srp_opt_tokens[i].pattern); | |
1519 | ||
1520 | out: | |
1521 | kfree(options); | |
1522 | return ret; | |
1523 | } | |
1524 | ||
1525 | static ssize_t srp_create_target(struct class_device *class_dev, | |
1526 | const char *buf, size_t count) | |
1527 | { | |
1528 | struct srp_host *host = | |
1529 | container_of(class_dev, struct srp_host, class_dev); | |
1530 | struct Scsi_Host *target_host; | |
1531 | struct srp_target_port *target; | |
1532 | int ret; | |
1533 | int i; | |
1534 | ||
1535 | target_host = scsi_host_alloc(&srp_template, | |
1536 | sizeof (struct srp_target_port)); | |
1537 | if (!target_host) | |
1538 | return -ENOMEM; | |
1539 | ||
5f068992 RD |
1540 | target_host->max_lun = SRP_MAX_LUN; |
1541 | ||
aef9ec39 RD |
1542 | target = host_to_target(target_host); |
1543 | memset(target, 0, sizeof *target); | |
1544 | ||
1545 | target->scsi_host = target_host; | |
1546 | target->srp_host = host; | |
1547 | ||
1548 | INIT_WORK(&target->work, srp_reconnect_work, target); | |
1549 | ||
d945e1df | 1550 | INIT_LIST_HEAD(&target->free_reqs); |
aef9ec39 | 1551 | INIT_LIST_HEAD(&target->req_queue); |
d945e1df RD |
1552 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
1553 | target->req_ring[i].index = i; | |
1554 | list_add_tail(&target->req_ring[i].list, &target->free_reqs); | |
1555 | } | |
aef9ec39 RD |
1556 | |
1557 | ret = srp_parse_options(buf, target); | |
1558 | if (ret) | |
1559 | goto err; | |
1560 | ||
1561 | ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid); | |
1562 | ||
1563 | printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x " | |
1564 | "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
1565 | (unsigned long long) be64_to_cpu(target->id_ext), | |
1566 | (unsigned long long) be64_to_cpu(target->ioc_guid), | |
1567 | be16_to_cpu(target->path.pkey), | |
1568 | (unsigned long long) be64_to_cpu(target->service_id), | |
1569 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]), | |
1570 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]), | |
1571 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]), | |
1572 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]), | |
1573 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]), | |
1574 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]), | |
1575 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]), | |
1576 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14])); | |
1577 | ||
1578 | ret = srp_create_target_ib(target); | |
1579 | if (ret) | |
1580 | goto err; | |
1581 | ||
1582 | target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target); | |
1583 | if (IS_ERR(target->cm_id)) { | |
1584 | ret = PTR_ERR(target->cm_id); | |
1585 | goto err_free; | |
1586 | } | |
1587 | ||
1588 | ret = srp_connect_target(target); | |
1589 | if (ret) { | |
1590 | printk(KERN_ERR PFX "Connection failed\n"); | |
1591 | goto err_cm_id; | |
1592 | } | |
1593 | ||
1594 | ret = srp_add_target(host, target); | |
1595 | if (ret) | |
1596 | goto err_disconnect; | |
1597 | ||
1598 | return count; | |
1599 | ||
1600 | err_disconnect: | |
1601 | srp_disconnect_target(target); | |
1602 | ||
1603 | err_cm_id: | |
1604 | ib_destroy_cm_id(target->cm_id); | |
1605 | ||
1606 | err_free: | |
1607 | srp_free_target_ib(target); | |
1608 | ||
1609 | err: | |
1610 | scsi_host_put(target_host); | |
1611 | ||
1612 | return ret; | |
1613 | } | |
1614 | ||
1615 | static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); | |
1616 | ||
1617 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) | |
1618 | { | |
1619 | struct srp_host *host = | |
1620 | container_of(class_dev, struct srp_host, class_dev); | |
1621 | ||
1622 | return sprintf(buf, "%s\n", host->dev->name); | |
1623 | } | |
1624 | ||
1625 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
1626 | ||
1627 | static ssize_t show_port(struct class_device *class_dev, char *buf) | |
1628 | { | |
1629 | struct srp_host *host = | |
1630 | container_of(class_dev, struct srp_host, class_dev); | |
1631 | ||
1632 | return sprintf(buf, "%d\n", host->port); | |
1633 | } | |
1634 | ||
1635 | static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); | |
1636 | ||
cf311cd4 | 1637 | static struct srp_host *srp_add_port(struct ib_device *device, u8 port) |
aef9ec39 RD |
1638 | { |
1639 | struct srp_host *host; | |
1640 | ||
1641 | host = kzalloc(sizeof *host, GFP_KERNEL); | |
1642 | if (!host) | |
1643 | return NULL; | |
1644 | ||
1645 | INIT_LIST_HEAD(&host->target_list); | |
8e9e5f4f | 1646 | mutex_init(&host->target_mutex); |
aef9ec39 RD |
1647 | init_completion(&host->released); |
1648 | host->dev = device; | |
1649 | host->port = port; | |
1650 | ||
1651 | host->initiator_port_id[7] = port; | |
cf311cd4 | 1652 | memcpy(host->initiator_port_id + 8, &device->node_guid, 8); |
aef9ec39 RD |
1653 | |
1654 | host->pd = ib_alloc_pd(device); | |
1655 | if (IS_ERR(host->pd)) | |
1656 | goto err_free; | |
1657 | ||
1658 | host->mr = ib_get_dma_mr(host->pd, | |
1659 | IB_ACCESS_LOCAL_WRITE | | |
1660 | IB_ACCESS_REMOTE_READ | | |
1661 | IB_ACCESS_REMOTE_WRITE); | |
1662 | if (IS_ERR(host->mr)) | |
1663 | goto err_pd; | |
1664 | ||
1665 | host->class_dev.class = &srp_class; | |
1666 | host->class_dev.dev = device->dma_device; | |
1667 | snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d", | |
1668 | device->name, port); | |
1669 | ||
1670 | if (class_device_register(&host->class_dev)) | |
1671 | goto err_mr; | |
1672 | if (class_device_create_file(&host->class_dev, &class_device_attr_add_target)) | |
1673 | goto err_class; | |
1674 | if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev)) | |
1675 | goto err_class; | |
1676 | if (class_device_create_file(&host->class_dev, &class_device_attr_port)) | |
1677 | goto err_class; | |
1678 | ||
1679 | return host; | |
1680 | ||
1681 | err_class: | |
1682 | class_device_unregister(&host->class_dev); | |
1683 | ||
1684 | err_mr: | |
1685 | ib_dereg_mr(host->mr); | |
1686 | ||
1687 | err_pd: | |
1688 | ib_dealloc_pd(host->pd); | |
1689 | ||
1690 | err_free: | |
1691 | kfree(host); | |
1692 | ||
1693 | return NULL; | |
1694 | } | |
1695 | ||
1696 | static void srp_add_one(struct ib_device *device) | |
1697 | { | |
1698 | struct list_head *dev_list; | |
1699 | struct srp_host *host; | |
aef9ec39 RD |
1700 | int s, e, p; |
1701 | ||
aef9ec39 RD |
1702 | dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL); |
1703 | if (!dev_list) | |
cf311cd4 | 1704 | return; |
aef9ec39 RD |
1705 | |
1706 | INIT_LIST_HEAD(dev_list); | |
1707 | ||
1708 | if (device->node_type == IB_NODE_SWITCH) { | |
1709 | s = 0; | |
1710 | e = 0; | |
1711 | } else { | |
1712 | s = 1; | |
1713 | e = device->phys_port_cnt; | |
1714 | } | |
1715 | ||
1716 | for (p = s; p <= e; ++p) { | |
cf311cd4 | 1717 | host = srp_add_port(device, p); |
aef9ec39 RD |
1718 | if (host) |
1719 | list_add_tail(&host->list, dev_list); | |
1720 | } | |
1721 | ||
1722 | ib_set_client_data(device, &srp_client, dev_list); | |
aef9ec39 RD |
1723 | } |
1724 | ||
1725 | static void srp_remove_one(struct ib_device *device) | |
1726 | { | |
1727 | struct list_head *dev_list; | |
1728 | struct srp_host *host, *tmp_host; | |
1729 | LIST_HEAD(target_list); | |
1730 | struct srp_target_port *target, *tmp_target; | |
1731 | unsigned long flags; | |
1732 | ||
1733 | dev_list = ib_get_client_data(device, &srp_client); | |
1734 | ||
1735 | list_for_each_entry_safe(host, tmp_host, dev_list, list) { | |
1736 | class_device_unregister(&host->class_dev); | |
1737 | /* | |
1738 | * Wait for the sysfs entry to go away, so that no new | |
1739 | * target ports can be created. | |
1740 | */ | |
1741 | wait_for_completion(&host->released); | |
1742 | ||
1743 | /* | |
1744 | * Mark all target ports as removed, so we stop queueing | |
1745 | * commands and don't try to reconnect. | |
1746 | */ | |
8e9e5f4f | 1747 | mutex_lock(&host->target_mutex); |
aef9ec39 RD |
1748 | list_for_each_entry_safe(target, tmp_target, |
1749 | &host->target_list, list) { | |
1750 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
1751 | if (target->state != SRP_TARGET_REMOVED) | |
1752 | target->state = SRP_TARGET_REMOVED; | |
1753 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
1754 | } | |
8e9e5f4f | 1755 | mutex_unlock(&host->target_mutex); |
aef9ec39 RD |
1756 | |
1757 | /* | |
1758 | * Wait for any reconnection tasks that may have | |
1759 | * started before we marked our target ports as | |
1760 | * removed, and any target port removal tasks. | |
1761 | */ | |
1762 | flush_scheduled_work(); | |
1763 | ||
1764 | list_for_each_entry_safe(target, tmp_target, | |
1765 | &host->target_list, list) { | |
1766 | scsi_remove_host(target->scsi_host); | |
1767 | srp_disconnect_target(target); | |
1768 | ib_destroy_cm_id(target->cm_id); | |
1769 | srp_free_target_ib(target); | |
1770 | scsi_host_put(target->scsi_host); | |
1771 | } | |
1772 | ||
1773 | ib_dereg_mr(host->mr); | |
1774 | ib_dealloc_pd(host->pd); | |
1775 | kfree(host); | |
1776 | } | |
1777 | ||
1778 | kfree(dev_list); | |
1779 | } | |
1780 | ||
1781 | static int __init srp_init_module(void) | |
1782 | { | |
1783 | int ret; | |
1784 | ||
1785 | ret = class_register(&srp_class); | |
1786 | if (ret) { | |
1787 | printk(KERN_ERR PFX "couldn't register class infiniband_srp\n"); | |
1788 | return ret; | |
1789 | } | |
1790 | ||
1791 | ret = ib_register_client(&srp_client); | |
1792 | if (ret) { | |
1793 | printk(KERN_ERR PFX "couldn't register IB client\n"); | |
1794 | class_unregister(&srp_class); | |
1795 | return ret; | |
1796 | } | |
1797 | ||
1798 | return 0; | |
1799 | } | |
1800 | ||
1801 | static void __exit srp_cleanup_module(void) | |
1802 | { | |
1803 | ib_unregister_client(&srp_client); | |
1804 | class_unregister(&srp_class); | |
1805 | } | |
1806 | ||
1807 | module_init(srp_init_module); | |
1808 | module_exit(srp_cleanup_module); |