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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 | ||
74b0a15b VP |
65 | static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE; |
66 | static int srp_max_iu_len; | |
67 | ||
68 | module_param(srp_sg_tablesize, int, 0444); | |
69 | MODULE_PARM_DESC(srp_sg_tablesize, | |
70 | "Max number of gather/scatter entries per I/O (default is 12)"); | |
71 | ||
aef9ec39 RD |
72 | static int topspin_workarounds = 1; |
73 | ||
74 | module_param(topspin_workarounds, int, 0444); | |
75 | MODULE_PARM_DESC(topspin_workarounds, | |
76 | "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); | |
77 | ||
78 | static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; | |
79 | ||
559ce8f1 IR |
80 | static int mellanox_workarounds = 1; |
81 | ||
82 | module_param(mellanox_workarounds, int, 0444); | |
83 | MODULE_PARM_DESC(mellanox_workarounds, | |
84 | "Enable workarounds for Mellanox SRP target bugs if != 0"); | |
85 | ||
86 | static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 }; | |
87 | ||
aef9ec39 RD |
88 | static void srp_add_one(struct ib_device *device); |
89 | static void srp_remove_one(struct ib_device *device); | |
90 | static void srp_completion(struct ib_cq *cq, void *target_ptr); | |
91 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); | |
92 | ||
93 | static struct ib_client srp_client = { | |
94 | .name = "srp", | |
95 | .add = srp_add_one, | |
96 | .remove = srp_remove_one | |
97 | }; | |
98 | ||
99 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) | |
100 | { | |
101 | return (struct srp_target_port *) host->hostdata; | |
102 | } | |
103 | ||
104 | static const char *srp_target_info(struct Scsi_Host *host) | |
105 | { | |
106 | return host_to_target(host)->target_name; | |
107 | } | |
108 | ||
109 | static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, | |
110 | gfp_t gfp_mask, | |
111 | enum dma_data_direction direction) | |
112 | { | |
113 | struct srp_iu *iu; | |
114 | ||
115 | iu = kmalloc(sizeof *iu, gfp_mask); | |
116 | if (!iu) | |
117 | goto out; | |
118 | ||
119 | iu->buf = kzalloc(size, gfp_mask); | |
120 | if (!iu->buf) | |
121 | goto out_free_iu; | |
122 | ||
f5358a17 RD |
123 | iu->dma = dma_map_single(host->dev->dev->dma_device, |
124 | iu->buf, size, direction); | |
aef9ec39 RD |
125 | if (dma_mapping_error(iu->dma)) |
126 | goto out_free_buf; | |
127 | ||
128 | iu->size = size; | |
129 | iu->direction = direction; | |
130 | ||
131 | return iu; | |
132 | ||
133 | out_free_buf: | |
134 | kfree(iu->buf); | |
135 | out_free_iu: | |
136 | kfree(iu); | |
137 | out: | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) | |
142 | { | |
143 | if (!iu) | |
144 | return; | |
145 | ||
f5358a17 RD |
146 | dma_unmap_single(host->dev->dev->dma_device, |
147 | iu->dma, iu->size, iu->direction); | |
aef9ec39 RD |
148 | kfree(iu->buf); |
149 | kfree(iu); | |
150 | } | |
151 | ||
152 | static void srp_qp_event(struct ib_event *event, void *context) | |
153 | { | |
154 | printk(KERN_ERR PFX "QP event %d\n", event->event); | |
155 | } | |
156 | ||
157 | static int srp_init_qp(struct srp_target_port *target, | |
158 | struct ib_qp *qp) | |
159 | { | |
160 | struct ib_qp_attr *attr; | |
161 | int ret; | |
162 | ||
163 | attr = kmalloc(sizeof *attr, GFP_KERNEL); | |
164 | if (!attr) | |
165 | return -ENOMEM; | |
166 | ||
f5358a17 | 167 | ret = ib_find_cached_pkey(target->srp_host->dev->dev, |
aef9ec39 RD |
168 | target->srp_host->port, |
169 | be16_to_cpu(target->path.pkey), | |
170 | &attr->pkey_index); | |
171 | if (ret) | |
172 | goto out; | |
173 | ||
174 | attr->qp_state = IB_QPS_INIT; | |
175 | attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | | |
176 | IB_ACCESS_REMOTE_WRITE); | |
177 | attr->port_num = target->srp_host->port; | |
178 | ||
179 | ret = ib_modify_qp(qp, attr, | |
180 | IB_QP_STATE | | |
181 | IB_QP_PKEY_INDEX | | |
182 | IB_QP_ACCESS_FLAGS | | |
183 | IB_QP_PORT); | |
184 | ||
185 | out: | |
186 | kfree(attr); | |
187 | return ret; | |
188 | } | |
189 | ||
190 | static int srp_create_target_ib(struct srp_target_port *target) | |
191 | { | |
192 | struct ib_qp_init_attr *init_attr; | |
193 | int ret; | |
194 | ||
195 | init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); | |
196 | if (!init_attr) | |
197 | return -ENOMEM; | |
198 | ||
f5358a17 | 199 | target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion, |
aef9ec39 RD |
200 | NULL, target, SRP_CQ_SIZE); |
201 | if (IS_ERR(target->cq)) { | |
202 | ret = PTR_ERR(target->cq); | |
203 | goto out; | |
204 | } | |
205 | ||
206 | ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP); | |
207 | ||
208 | init_attr->event_handler = srp_qp_event; | |
209 | init_attr->cap.max_send_wr = SRP_SQ_SIZE; | |
210 | init_attr->cap.max_recv_wr = SRP_RQ_SIZE; | |
211 | init_attr->cap.max_recv_sge = 1; | |
212 | init_attr->cap.max_send_sge = 1; | |
213 | init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; | |
214 | init_attr->qp_type = IB_QPT_RC; | |
215 | init_attr->send_cq = target->cq; | |
216 | init_attr->recv_cq = target->cq; | |
217 | ||
f5358a17 | 218 | target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr); |
aef9ec39 RD |
219 | if (IS_ERR(target->qp)) { |
220 | ret = PTR_ERR(target->qp); | |
221 | ib_destroy_cq(target->cq); | |
222 | goto out; | |
223 | } | |
224 | ||
225 | ret = srp_init_qp(target, target->qp); | |
226 | if (ret) { | |
227 | ib_destroy_qp(target->qp); | |
228 | ib_destroy_cq(target->cq); | |
229 | goto out; | |
230 | } | |
231 | ||
232 | out: | |
233 | kfree(init_attr); | |
234 | return ret; | |
235 | } | |
236 | ||
237 | static void srp_free_target_ib(struct srp_target_port *target) | |
238 | { | |
239 | int i; | |
240 | ||
241 | ib_destroy_qp(target->qp); | |
242 | ib_destroy_cq(target->cq); | |
243 | ||
244 | for (i = 0; i < SRP_RQ_SIZE; ++i) | |
245 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
246 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) | |
247 | srp_free_iu(target->srp_host, target->tx_ring[i]); | |
248 | } | |
249 | ||
250 | static void srp_path_rec_completion(int status, | |
251 | struct ib_sa_path_rec *pathrec, | |
252 | void *target_ptr) | |
253 | { | |
254 | struct srp_target_port *target = target_ptr; | |
255 | ||
256 | target->status = status; | |
257 | if (status) | |
258 | printk(KERN_ERR PFX "Got failed path rec status %d\n", status); | |
259 | else | |
260 | target->path = *pathrec; | |
261 | complete(&target->done); | |
262 | } | |
263 | ||
264 | static int srp_lookup_path(struct srp_target_port *target) | |
265 | { | |
266 | target->path.numb_path = 1; | |
267 | ||
268 | init_completion(&target->done); | |
269 | ||
f5358a17 | 270 | target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev->dev, |
aef9ec39 RD |
271 | target->srp_host->port, |
272 | &target->path, | |
273 | IB_SA_PATH_REC_DGID | | |
274 | IB_SA_PATH_REC_SGID | | |
275 | IB_SA_PATH_REC_NUMB_PATH | | |
276 | IB_SA_PATH_REC_PKEY, | |
277 | SRP_PATH_REC_TIMEOUT_MS, | |
278 | GFP_KERNEL, | |
279 | srp_path_rec_completion, | |
280 | target, &target->path_query); | |
281 | if (target->path_query_id < 0) | |
282 | return target->path_query_id; | |
283 | ||
284 | wait_for_completion(&target->done); | |
285 | ||
286 | if (target->status < 0) | |
287 | printk(KERN_WARNING PFX "Path record query failed\n"); | |
288 | ||
289 | return target->status; | |
290 | } | |
291 | ||
292 | static int srp_send_req(struct srp_target_port *target) | |
293 | { | |
294 | struct { | |
295 | struct ib_cm_req_param param; | |
296 | struct srp_login_req priv; | |
297 | } *req = NULL; | |
298 | int status; | |
299 | ||
300 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
301 | if (!req) | |
302 | return -ENOMEM; | |
303 | ||
304 | req->param.primary_path = &target->path; | |
305 | req->param.alternate_path = NULL; | |
306 | req->param.service_id = target->service_id; | |
307 | req->param.qp_num = target->qp->qp_num; | |
308 | req->param.qp_type = target->qp->qp_type; | |
309 | req->param.private_data = &req->priv; | |
310 | req->param.private_data_len = sizeof req->priv; | |
311 | req->param.flow_control = 1; | |
312 | ||
313 | get_random_bytes(&req->param.starting_psn, 4); | |
314 | req->param.starting_psn &= 0xffffff; | |
315 | ||
316 | /* | |
317 | * Pick some arbitrary defaults here; we could make these | |
318 | * module parameters if anyone cared about setting them. | |
319 | */ | |
320 | req->param.responder_resources = 4; | |
321 | req->param.remote_cm_response_timeout = 20; | |
322 | req->param.local_cm_response_timeout = 20; | |
323 | req->param.retry_count = 7; | |
324 | req->param.rnr_retry_count = 7; | |
325 | req->param.max_cm_retries = 15; | |
326 | ||
327 | req->priv.opcode = SRP_LOGIN_REQ; | |
328 | req->priv.tag = 0; | |
74b0a15b | 329 | req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len); |
aef9ec39 RD |
330 | req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
331 | SRP_BUF_FORMAT_INDIRECT); | |
0c0450db | 332 | /* |
3cd96564 | 333 | * In the published SRP specification (draft rev. 16a), the |
0c0450db R |
334 | * port identifier format is 8 bytes of ID extension followed |
335 | * by 8 bytes of GUID. Older drafts put the two halves in the | |
336 | * opposite order, so that the GUID comes first. | |
337 | * | |
338 | * Targets conforming to these obsolete drafts can be | |
339 | * recognized by the I/O Class they report. | |
340 | */ | |
341 | if (target->io_class == SRP_REV10_IB_IO_CLASS) { | |
342 | memcpy(req->priv.initiator_port_id, | |
343 | target->srp_host->initiator_port_id + 8, 8); | |
344 | memcpy(req->priv.initiator_port_id + 8, | |
345 | target->srp_host->initiator_port_id, 8); | |
346 | memcpy(req->priv.target_port_id, &target->ioc_guid, 8); | |
347 | memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); | |
348 | } else { | |
349 | memcpy(req->priv.initiator_port_id, | |
350 | target->srp_host->initiator_port_id, 16); | |
351 | memcpy(req->priv.target_port_id, &target->id_ext, 8); | |
352 | memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); | |
353 | } | |
354 | ||
aef9ec39 RD |
355 | /* |
356 | * Topspin/Cisco SRP targets will reject our login unless we | |
357 | * zero out the first 8 bytes of our initiator port ID. The | |
358 | * second 8 bytes must be our local node GUID, but we always | |
359 | * use that anyway. | |
360 | */ | |
361 | if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) { | |
362 | printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround " | |
363 | "activated for target GUID %016llx\n", | |
364 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
365 | memset(req->priv.initiator_port_id, 0, 8); | |
366 | } | |
aef9ec39 RD |
367 | |
368 | status = ib_send_cm_req(target->cm_id, &req->param); | |
369 | ||
370 | kfree(req); | |
371 | ||
372 | return status; | |
373 | } | |
374 | ||
375 | static void srp_disconnect_target(struct srp_target_port *target) | |
376 | { | |
377 | /* XXX should send SRP_I_LOGOUT request */ | |
378 | ||
379 | init_completion(&target->done); | |
e6581056 RD |
380 | if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { |
381 | printk(KERN_DEBUG PFX "Sending CM DREQ failed\n"); | |
382 | return; | |
383 | } | |
aef9ec39 RD |
384 | wait_for_completion(&target->done); |
385 | } | |
386 | ||
387 | static void srp_remove_work(void *target_ptr) | |
388 | { | |
389 | struct srp_target_port *target = target_ptr; | |
390 | ||
391 | spin_lock_irq(target->scsi_host->host_lock); | |
392 | if (target->state != SRP_TARGET_DEAD) { | |
393 | spin_unlock_irq(target->scsi_host->host_lock); | |
aef9ec39 RD |
394 | return; |
395 | } | |
396 | target->state = SRP_TARGET_REMOVED; | |
397 | spin_unlock_irq(target->scsi_host->host_lock); | |
398 | ||
b3589fd4 | 399 | spin_lock(&target->srp_host->target_lock); |
aef9ec39 | 400 | list_del(&target->list); |
b3589fd4 | 401 | spin_unlock(&target->srp_host->target_lock); |
aef9ec39 RD |
402 | |
403 | scsi_remove_host(target->scsi_host); | |
404 | ib_destroy_cm_id(target->cm_id); | |
405 | srp_free_target_ib(target); | |
406 | scsi_host_put(target->scsi_host); | |
aef9ec39 RD |
407 | } |
408 | ||
409 | static int srp_connect_target(struct srp_target_port *target) | |
410 | { | |
411 | int ret; | |
412 | ||
413 | ret = srp_lookup_path(target); | |
414 | if (ret) | |
415 | return ret; | |
416 | ||
417 | while (1) { | |
418 | init_completion(&target->done); | |
419 | ret = srp_send_req(target); | |
420 | if (ret) | |
421 | return ret; | |
422 | wait_for_completion(&target->done); | |
423 | ||
424 | /* | |
425 | * The CM event handling code will set status to | |
426 | * SRP_PORT_REDIRECT if we get a port redirect REJ | |
427 | * back, or SRP_DLID_REDIRECT if we get a lid/qp | |
428 | * redirect REJ back. | |
429 | */ | |
430 | switch (target->status) { | |
431 | case 0: | |
432 | return 0; | |
433 | ||
434 | case SRP_PORT_REDIRECT: | |
435 | ret = srp_lookup_path(target); | |
436 | if (ret) | |
437 | return ret; | |
438 | break; | |
439 | ||
440 | case SRP_DLID_REDIRECT: | |
441 | break; | |
442 | ||
443 | default: | |
444 | return target->status; | |
445 | } | |
446 | } | |
447 | } | |
448 | ||
d945e1df RD |
449 | static void srp_unmap_data(struct scsi_cmnd *scmnd, |
450 | struct srp_target_port *target, | |
451 | struct srp_request *req) | |
452 | { | |
453 | struct scatterlist *scat; | |
454 | int nents; | |
455 | ||
456 | if (!scmnd->request_buffer || | |
457 | (scmnd->sc_data_direction != DMA_TO_DEVICE && | |
458 | scmnd->sc_data_direction != DMA_FROM_DEVICE)) | |
459 | return; | |
460 | ||
f5358a17 RD |
461 | if (req->fmr) { |
462 | ib_fmr_pool_unmap(req->fmr); | |
463 | req->fmr = NULL; | |
464 | } | |
465 | ||
d945e1df RD |
466 | /* |
467 | * This handling of non-SG commands can be killed when the | |
468 | * SCSI midlayer no longer generates non-SG commands. | |
469 | */ | |
470 | if (likely(scmnd->use_sg)) { | |
471 | nents = scmnd->use_sg; | |
472 | scat = scmnd->request_buffer; | |
473 | } else { | |
474 | nents = 1; | |
475 | scat = &req->fake_sg; | |
476 | } | |
477 | ||
f5358a17 | 478 | dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents, |
d945e1df RD |
479 | scmnd->sc_data_direction); |
480 | } | |
481 | ||
526b4caa IR |
482 | static void srp_remove_req(struct srp_target_port *target, struct srp_request *req) |
483 | { | |
484 | srp_unmap_data(req->scmnd, target, req); | |
485 | list_move_tail(&req->list, &target->free_reqs); | |
486 | } | |
487 | ||
488 | static void srp_reset_req(struct srp_target_port *target, struct srp_request *req) | |
489 | { | |
490 | req->scmnd->result = DID_RESET << 16; | |
491 | req->scmnd->scsi_done(req->scmnd); | |
492 | srp_remove_req(target, req); | |
493 | } | |
494 | ||
aef9ec39 RD |
495 | static int srp_reconnect_target(struct srp_target_port *target) |
496 | { | |
497 | struct ib_cm_id *new_cm_id; | |
498 | struct ib_qp_attr qp_attr; | |
526b4caa | 499 | struct srp_request *req, *tmp; |
aef9ec39 RD |
500 | struct ib_wc wc; |
501 | int ret; | |
aef9ec39 RD |
502 | |
503 | spin_lock_irq(target->scsi_host->host_lock); | |
504 | if (target->state != SRP_TARGET_LIVE) { | |
505 | spin_unlock_irq(target->scsi_host->host_lock); | |
506 | return -EAGAIN; | |
507 | } | |
508 | target->state = SRP_TARGET_CONNECTING; | |
509 | spin_unlock_irq(target->scsi_host->host_lock); | |
510 | ||
511 | srp_disconnect_target(target); | |
512 | /* | |
513 | * Now get a new local CM ID so that we avoid confusing the | |
514 | * target in case things are really fouled up. | |
515 | */ | |
f5358a17 | 516 | new_cm_id = ib_create_cm_id(target->srp_host->dev->dev, |
aef9ec39 RD |
517 | srp_cm_handler, target); |
518 | if (IS_ERR(new_cm_id)) { | |
519 | ret = PTR_ERR(new_cm_id); | |
520 | goto err; | |
521 | } | |
522 | ib_destroy_cm_id(target->cm_id); | |
523 | target->cm_id = new_cm_id; | |
524 | ||
525 | qp_attr.qp_state = IB_QPS_RESET; | |
526 | ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE); | |
527 | if (ret) | |
528 | goto err; | |
529 | ||
530 | ret = srp_init_qp(target, target->qp); | |
531 | if (ret) | |
532 | goto err; | |
533 | ||
534 | while (ib_poll_cq(target->cq, 1, &wc) > 0) | |
535 | ; /* nothing */ | |
536 | ||
d916a8f1 | 537 | spin_lock_irq(target->scsi_host->host_lock); |
526b4caa IR |
538 | list_for_each_entry_safe(req, tmp, &target->req_queue, list) |
539 | srp_reset_req(target, req); | |
d916a8f1 | 540 | spin_unlock_irq(target->scsi_host->host_lock); |
aef9ec39 RD |
541 | |
542 | target->rx_head = 0; | |
543 | target->tx_head = 0; | |
544 | target->tx_tail = 0; | |
aef9ec39 RD |
545 | |
546 | ret = srp_connect_target(target); | |
547 | if (ret) | |
548 | goto err; | |
549 | ||
550 | spin_lock_irq(target->scsi_host->host_lock); | |
551 | if (target->state == SRP_TARGET_CONNECTING) { | |
552 | ret = 0; | |
553 | target->state = SRP_TARGET_LIVE; | |
554 | } else | |
555 | ret = -EAGAIN; | |
556 | spin_unlock_irq(target->scsi_host->host_lock); | |
557 | ||
558 | return ret; | |
559 | ||
560 | err: | |
561 | printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret); | |
562 | ||
563 | /* | |
564 | * We couldn't reconnect, so kill our target port off. | |
565 | * However, we have to defer the real removal because we might | |
566 | * be in the context of the SCSI error handler now, which | |
567 | * would deadlock if we call scsi_remove_host(). | |
568 | */ | |
569 | spin_lock_irq(target->scsi_host->host_lock); | |
570 | if (target->state == SRP_TARGET_CONNECTING) { | |
571 | target->state = SRP_TARGET_DEAD; | |
572 | INIT_WORK(&target->work, srp_remove_work, target); | |
573 | schedule_work(&target->work); | |
574 | } | |
575 | spin_unlock_irq(target->scsi_host->host_lock); | |
576 | ||
577 | return ret; | |
578 | } | |
579 | ||
559ce8f1 | 580 | static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat, |
f5358a17 RD |
581 | int sg_cnt, struct srp_request *req, |
582 | struct srp_direct_buf *buf) | |
583 | { | |
584 | u64 io_addr = 0; | |
585 | u64 *dma_pages; | |
586 | u32 len; | |
587 | int page_cnt; | |
588 | int i, j; | |
589 | int ret; | |
559ce8f1 | 590 | struct srp_device *dev = target->srp_host->dev; |
f5358a17 RD |
591 | |
592 | if (!dev->fmr_pool) | |
593 | return -ENODEV; | |
594 | ||
559ce8f1 IR |
595 | if ((sg_dma_address(&scat[0]) & ~dev->fmr_page_mask) && |
596 | mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3)) | |
597 | return -EINVAL; | |
598 | ||
f5358a17 RD |
599 | len = page_cnt = 0; |
600 | for (i = 0; i < sg_cnt; ++i) { | |
601 | if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) { | |
602 | if (i > 0) | |
603 | return -EINVAL; | |
604 | else | |
605 | ++page_cnt; | |
606 | } | |
607 | if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) & | |
608 | ~dev->fmr_page_mask) { | |
609 | if (i < sg_cnt - 1) | |
610 | return -EINVAL; | |
611 | else | |
612 | ++page_cnt; | |
613 | } | |
614 | ||
615 | len += sg_dma_len(&scat[i]); | |
616 | } | |
617 | ||
618 | page_cnt += len >> dev->fmr_page_shift; | |
619 | if (page_cnt > SRP_FMR_SIZE) | |
620 | return -ENOMEM; | |
621 | ||
622 | dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC); | |
623 | if (!dma_pages) | |
624 | return -ENOMEM; | |
625 | ||
626 | page_cnt = 0; | |
627 | for (i = 0; i < sg_cnt; ++i) | |
628 | for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size) | |
629 | dma_pages[page_cnt++] = | |
630 | (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j; | |
631 | ||
632 | req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool, | |
adfaa888 | 633 | dma_pages, page_cnt, io_addr); |
f5358a17 RD |
634 | if (IS_ERR(req->fmr)) { |
635 | ret = PTR_ERR(req->fmr); | |
6583eb3d | 636 | req->fmr = NULL; |
f5358a17 RD |
637 | goto out; |
638 | } | |
639 | ||
640 | buf->va = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask); | |
641 | buf->key = cpu_to_be32(req->fmr->fmr->rkey); | |
642 | buf->len = cpu_to_be32(len); | |
643 | ||
644 | ret = 0; | |
645 | ||
646 | out: | |
647 | kfree(dma_pages); | |
648 | ||
649 | return ret; | |
650 | } | |
651 | ||
aef9ec39 RD |
652 | static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, |
653 | struct srp_request *req) | |
654 | { | |
cf368713 | 655 | struct scatterlist *scat; |
aef9ec39 | 656 | struct srp_cmd *cmd = req->cmd->buf; |
cf368713 | 657 | int len, nents, count; |
f5358a17 | 658 | u8 fmt = SRP_DATA_DESC_DIRECT; |
aef9ec39 RD |
659 | |
660 | if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE) | |
661 | return sizeof (struct srp_cmd); | |
662 | ||
663 | if (scmnd->sc_data_direction != DMA_FROM_DEVICE && | |
664 | scmnd->sc_data_direction != DMA_TO_DEVICE) { | |
665 | printk(KERN_WARNING PFX "Unhandled data direction %d\n", | |
666 | scmnd->sc_data_direction); | |
667 | return -EINVAL; | |
668 | } | |
669 | ||
cf368713 RD |
670 | /* |
671 | * This handling of non-SG commands can be killed when the | |
672 | * SCSI midlayer no longer generates non-SG commands. | |
673 | */ | |
674 | if (likely(scmnd->use_sg)) { | |
675 | nents = scmnd->use_sg; | |
676 | scat = scmnd->request_buffer; | |
677 | } else { | |
678 | nents = 1; | |
679 | scat = &req->fake_sg; | |
680 | sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen); | |
681 | } | |
aef9ec39 | 682 | |
f5358a17 RD |
683 | count = dma_map_sg(target->srp_host->dev->dev->dma_device, |
684 | scat, nents, scmnd->sc_data_direction); | |
685 | ||
686 | fmt = SRP_DATA_DESC_DIRECT; | |
687 | len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); | |
aef9ec39 | 688 | |
cf368713 | 689 | if (count == 1) { |
f5358a17 RD |
690 | /* |
691 | * The midlayer only generated a single gather/scatter | |
692 | * entry, or DMA mapping coalesced everything to a | |
693 | * single entry. So a direct descriptor along with | |
694 | * the DMA MR suffices. | |
695 | */ | |
cf368713 | 696 | struct srp_direct_buf *buf = (void *) cmd->add_data; |
aef9ec39 | 697 | |
cf368713 | 698 | buf->va = cpu_to_be64(sg_dma_address(scat)); |
f5358a17 | 699 | buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey); |
cf368713 | 700 | buf->len = cpu_to_be32(sg_dma_len(scat)); |
559ce8f1 | 701 | } else if (srp_map_fmr(target, scat, count, req, |
f5358a17 RD |
702 | (void *) cmd->add_data)) { |
703 | /* | |
704 | * FMR mapping failed, and the scatterlist has more | |
705 | * than one entry. Generate an indirect memory | |
706 | * descriptor. | |
707 | */ | |
cf368713 RD |
708 | struct srp_indirect_buf *buf = (void *) cmd->add_data; |
709 | u32 datalen = 0; | |
f5358a17 | 710 | int i; |
aef9ec39 | 711 | |
cf368713 | 712 | fmt = SRP_DATA_DESC_INDIRECT; |
f5358a17 RD |
713 | len = sizeof (struct srp_cmd) + |
714 | sizeof (struct srp_indirect_buf) + | |
715 | count * sizeof (struct srp_direct_buf); | |
716 | ||
717 | for (i = 0; i < count; ++i) { | |
718 | buf->desc_list[i].va = | |
719 | cpu_to_be64(sg_dma_address(&scat[i])); | |
720 | buf->desc_list[i].key = | |
721 | cpu_to_be32(target->srp_host->dev->mr->rkey); | |
722 | buf->desc_list[i].len = | |
723 | cpu_to_be32(sg_dma_len(&scat[i])); | |
724 | datalen += sg_dma_len(&scat[i]); | |
725 | } | |
aef9ec39 | 726 | |
cf368713 RD |
727 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) |
728 | cmd->data_out_desc_cnt = count; | |
729 | else | |
730 | cmd->data_in_desc_cnt = count; | |
731 | ||
f5358a17 RD |
732 | buf->table_desc.va = |
733 | cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf); | |
cf368713 | 734 | buf->table_desc.key = |
f5358a17 | 735 | cpu_to_be32(target->srp_host->dev->mr->rkey); |
cf368713 RD |
736 | buf->table_desc.len = |
737 | cpu_to_be32(count * sizeof (struct srp_direct_buf)); | |
738 | ||
cf368713 | 739 | buf->len = cpu_to_be32(datalen); |
aef9ec39 RD |
740 | } |
741 | ||
742 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) | |
743 | cmd->buf_fmt = fmt << 4; | |
744 | else | |
745 | cmd->buf_fmt = fmt; | |
746 | ||
aef9ec39 RD |
747 | return len; |
748 | } | |
749 | ||
aef9ec39 RD |
750 | static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) |
751 | { | |
752 | struct srp_request *req; | |
753 | struct scsi_cmnd *scmnd; | |
754 | unsigned long flags; | |
755 | s32 delta; | |
756 | ||
757 | delta = (s32) be32_to_cpu(rsp->req_lim_delta); | |
758 | ||
759 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
760 | ||
761 | target->req_lim += delta; | |
762 | ||
763 | req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT]; | |
764 | ||
765 | if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { | |
766 | if (be32_to_cpu(rsp->resp_data_len) < 4) | |
767 | req->tsk_status = -1; | |
768 | else | |
769 | req->tsk_status = rsp->data[3]; | |
770 | complete(&req->done); | |
771 | } else { | |
d945e1df | 772 | scmnd = req->scmnd; |
aef9ec39 RD |
773 | if (!scmnd) |
774 | printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n", | |
775 | (unsigned long long) rsp->tag); | |
776 | scmnd->result = rsp->status; | |
777 | ||
778 | if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { | |
779 | memcpy(scmnd->sense_buffer, rsp->data + | |
780 | be32_to_cpu(rsp->resp_data_len), | |
781 | min_t(int, be32_to_cpu(rsp->sense_data_len), | |
782 | SCSI_SENSE_BUFFERSIZE)); | |
783 | } | |
784 | ||
785 | if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) | |
786 | scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt); | |
787 | else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) | |
788 | scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt); | |
789 | ||
aef9ec39 | 790 | if (!req->tsk_mgmt) { |
aef9ec39 RD |
791 | scmnd->host_scribble = (void *) -1L; |
792 | scmnd->scsi_done(scmnd); | |
793 | ||
d945e1df | 794 | srp_remove_req(target, req); |
aef9ec39 RD |
795 | } else |
796 | req->cmd_done = 1; | |
797 | } | |
798 | ||
799 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
800 | } | |
801 | ||
aef9ec39 RD |
802 | static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) |
803 | { | |
804 | struct srp_iu *iu; | |
805 | u8 opcode; | |
806 | ||
807 | iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV]; | |
808 | ||
f5358a17 | 809 | dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma, |
aef9ec39 RD |
810 | target->max_ti_iu_len, DMA_FROM_DEVICE); |
811 | ||
812 | opcode = *(u8 *) iu->buf; | |
813 | ||
814 | if (0) { | |
815 | int i; | |
816 | ||
817 | printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode); | |
818 | ||
819 | for (i = 0; i < wc->byte_len; ++i) { | |
820 | if (i % 8 == 0) | |
821 | printk(KERN_ERR " [%02x] ", i); | |
822 | printk(" %02x", ((u8 *) iu->buf)[i]); | |
823 | if ((i + 1) % 8 == 0) | |
824 | printk("\n"); | |
825 | } | |
826 | ||
827 | if (wc->byte_len % 8) | |
828 | printk("\n"); | |
829 | } | |
830 | ||
831 | switch (opcode) { | |
832 | case SRP_RSP: | |
833 | srp_process_rsp(target, iu->buf); | |
834 | break; | |
835 | ||
836 | case SRP_T_LOGOUT: | |
837 | /* XXX Handle target logout */ | |
838 | printk(KERN_WARNING PFX "Got target logout request\n"); | |
839 | break; | |
840 | ||
841 | default: | |
842 | printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode); | |
843 | break; | |
844 | } | |
845 | ||
f5358a17 | 846 | dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma, |
aef9ec39 RD |
847 | target->max_ti_iu_len, DMA_FROM_DEVICE); |
848 | } | |
849 | ||
850 | static void srp_completion(struct ib_cq *cq, void *target_ptr) | |
851 | { | |
852 | struct srp_target_port *target = target_ptr; | |
853 | struct ib_wc wc; | |
aef9ec39 RD |
854 | |
855 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
856 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
857 | if (wc.status) { | |
858 | printk(KERN_ERR PFX "failed %s status %d\n", | |
859 | wc.wr_id & SRP_OP_RECV ? "receive" : "send", | |
860 | wc.status); | |
aef9ec39 RD |
861 | break; |
862 | } | |
863 | ||
864 | if (wc.wr_id & SRP_OP_RECV) | |
865 | srp_handle_recv(target, &wc); | |
866 | else | |
867 | ++target->tx_tail; | |
868 | } | |
869 | } | |
870 | ||
871 | static int __srp_post_recv(struct srp_target_port *target) | |
872 | { | |
873 | struct srp_iu *iu; | |
874 | struct ib_sge list; | |
875 | struct ib_recv_wr wr, *bad_wr; | |
876 | unsigned int next; | |
877 | int ret; | |
878 | ||
879 | next = target->rx_head & (SRP_RQ_SIZE - 1); | |
880 | wr.wr_id = next | SRP_OP_RECV; | |
881 | iu = target->rx_ring[next]; | |
882 | ||
883 | list.addr = iu->dma; | |
884 | list.length = iu->size; | |
f5358a17 | 885 | list.lkey = target->srp_host->dev->mr->lkey; |
aef9ec39 RD |
886 | |
887 | wr.next = NULL; | |
888 | wr.sg_list = &list; | |
889 | wr.num_sge = 1; | |
890 | ||
891 | ret = ib_post_recv(target->qp, &wr, &bad_wr); | |
892 | if (!ret) | |
893 | ++target->rx_head; | |
894 | ||
895 | return ret; | |
896 | } | |
897 | ||
898 | static int srp_post_recv(struct srp_target_port *target) | |
899 | { | |
900 | unsigned long flags; | |
901 | int ret; | |
902 | ||
903 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
904 | ret = __srp_post_recv(target); | |
905 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
906 | ||
907 | return ret; | |
908 | } | |
909 | ||
910 | /* | |
911 | * Must be called with target->scsi_host->host_lock held to protect | |
47f2bce9 RD |
912 | * req_lim and tx_head. Lock cannot be dropped between call here and |
913 | * call to __srp_post_send(). | |
aef9ec39 RD |
914 | */ |
915 | static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target) | |
916 | { | |
917 | if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE) | |
918 | return NULL; | |
919 | ||
6bfa24fa RD |
920 | if (unlikely(target->req_lim < 1)) |
921 | ++target->zero_req_lim; | |
47f2bce9 | 922 | |
aef9ec39 RD |
923 | return target->tx_ring[target->tx_head & SRP_SQ_SIZE]; |
924 | } | |
925 | ||
926 | /* | |
927 | * Must be called with target->scsi_host->host_lock held to protect | |
928 | * req_lim and tx_head. | |
929 | */ | |
930 | static int __srp_post_send(struct srp_target_port *target, | |
931 | struct srp_iu *iu, int len) | |
932 | { | |
933 | struct ib_sge list; | |
934 | struct ib_send_wr wr, *bad_wr; | |
935 | int ret = 0; | |
936 | ||
aef9ec39 RD |
937 | list.addr = iu->dma; |
938 | list.length = len; | |
f5358a17 | 939 | list.lkey = target->srp_host->dev->mr->lkey; |
aef9ec39 RD |
940 | |
941 | wr.next = NULL; | |
942 | wr.wr_id = target->tx_head & SRP_SQ_SIZE; | |
943 | wr.sg_list = &list; | |
944 | wr.num_sge = 1; | |
945 | wr.opcode = IB_WR_SEND; | |
946 | wr.send_flags = IB_SEND_SIGNALED; | |
947 | ||
948 | ret = ib_post_send(target->qp, &wr, &bad_wr); | |
949 | ||
950 | if (!ret) { | |
951 | ++target->tx_head; | |
952 | --target->req_lim; | |
953 | } | |
954 | ||
955 | return ret; | |
956 | } | |
957 | ||
958 | static int srp_queuecommand(struct scsi_cmnd *scmnd, | |
959 | void (*done)(struct scsi_cmnd *)) | |
960 | { | |
961 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
962 | struct srp_request *req; | |
963 | struct srp_iu *iu; | |
964 | struct srp_cmd *cmd; | |
aef9ec39 RD |
965 | int len; |
966 | ||
967 | if (target->state == SRP_TARGET_CONNECTING) | |
968 | goto err; | |
969 | ||
970 | if (target->state == SRP_TARGET_DEAD || | |
971 | target->state == SRP_TARGET_REMOVED) { | |
972 | scmnd->result = DID_BAD_TARGET << 16; | |
973 | done(scmnd); | |
974 | return 0; | |
975 | } | |
976 | ||
977 | iu = __srp_get_tx_iu(target); | |
978 | if (!iu) | |
979 | goto err; | |
980 | ||
f5358a17 | 981 | dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma, |
74b0a15b | 982 | srp_max_iu_len, DMA_TO_DEVICE); |
aef9ec39 | 983 | |
d945e1df | 984 | req = list_entry(target->free_reqs.next, struct srp_request, list); |
aef9ec39 RD |
985 | |
986 | scmnd->scsi_done = done; | |
987 | scmnd->result = 0; | |
d945e1df | 988 | scmnd->host_scribble = (void *) (long) req->index; |
aef9ec39 RD |
989 | |
990 | cmd = iu->buf; | |
991 | memset(cmd, 0, sizeof *cmd); | |
992 | ||
993 | cmd->opcode = SRP_CMD; | |
994 | cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); | |
d945e1df | 995 | cmd->tag = req->index; |
aef9ec39 RD |
996 | memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); |
997 | ||
aef9ec39 RD |
998 | req->scmnd = scmnd; |
999 | req->cmd = iu; | |
1000 | req->cmd_done = 0; | |
1001 | req->tsk_mgmt = NULL; | |
1002 | ||
1003 | len = srp_map_data(scmnd, target, req); | |
1004 | if (len < 0) { | |
1005 | printk(KERN_ERR PFX "Failed to map data\n"); | |
1006 | goto err; | |
1007 | } | |
1008 | ||
1009 | if (__srp_post_recv(target)) { | |
1010 | printk(KERN_ERR PFX "Recv failed\n"); | |
1011 | goto err_unmap; | |
1012 | } | |
1013 | ||
f5358a17 | 1014 | dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma, |
74b0a15b | 1015 | srp_max_iu_len, DMA_TO_DEVICE); |
aef9ec39 RD |
1016 | |
1017 | if (__srp_post_send(target, iu, len)) { | |
1018 | printk(KERN_ERR PFX "Send failed\n"); | |
1019 | goto err_unmap; | |
1020 | } | |
1021 | ||
d945e1df | 1022 | list_move_tail(&req->list, &target->req_queue); |
aef9ec39 RD |
1023 | |
1024 | return 0; | |
1025 | ||
1026 | err_unmap: | |
1027 | srp_unmap_data(scmnd, target, req); | |
1028 | ||
1029 | err: | |
1030 | return SCSI_MLQUEUE_HOST_BUSY; | |
1031 | } | |
1032 | ||
1033 | static int srp_alloc_iu_bufs(struct srp_target_port *target) | |
1034 | { | |
1035 | int i; | |
1036 | ||
1037 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1038 | target->rx_ring[i] = srp_alloc_iu(target->srp_host, | |
1039 | target->max_ti_iu_len, | |
1040 | GFP_KERNEL, DMA_FROM_DEVICE); | |
1041 | if (!target->rx_ring[i]) | |
1042 | goto err; | |
1043 | } | |
1044 | ||
1045 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) { | |
1046 | target->tx_ring[i] = srp_alloc_iu(target->srp_host, | |
74b0a15b | 1047 | srp_max_iu_len, |
aef9ec39 RD |
1048 | GFP_KERNEL, DMA_TO_DEVICE); |
1049 | if (!target->tx_ring[i]) | |
1050 | goto err; | |
1051 | } | |
1052 | ||
1053 | return 0; | |
1054 | ||
1055 | err: | |
1056 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1057 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
1058 | target->rx_ring[i] = NULL; | |
1059 | } | |
1060 | ||
1061 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) { | |
1062 | srp_free_iu(target->srp_host, target->tx_ring[i]); | |
1063 | target->tx_ring[i] = NULL; | |
1064 | } | |
1065 | ||
1066 | return -ENOMEM; | |
1067 | } | |
1068 | ||
1069 | static void srp_cm_rej_handler(struct ib_cm_id *cm_id, | |
1070 | struct ib_cm_event *event, | |
1071 | struct srp_target_port *target) | |
1072 | { | |
1073 | struct ib_class_port_info *cpi; | |
1074 | int opcode; | |
1075 | ||
1076 | switch (event->param.rej_rcvd.reason) { | |
1077 | case IB_CM_REJ_PORT_CM_REDIRECT: | |
1078 | cpi = event->param.rej_rcvd.ari; | |
1079 | target->path.dlid = cpi->redirect_lid; | |
1080 | target->path.pkey = cpi->redirect_pkey; | |
1081 | cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; | |
1082 | memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); | |
1083 | ||
1084 | target->status = target->path.dlid ? | |
1085 | SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; | |
1086 | break; | |
1087 | ||
1088 | case IB_CM_REJ_PORT_REDIRECT: | |
1089 | if (topspin_workarounds && | |
1090 | !memcmp(&target->ioc_guid, topspin_oui, 3)) { | |
1091 | /* | |
1092 | * Topspin/Cisco SRP gateways incorrectly send | |
1093 | * reject reason code 25 when they mean 24 | |
1094 | * (port redirect). | |
1095 | */ | |
1096 | memcpy(target->path.dgid.raw, | |
1097 | event->param.rej_rcvd.ari, 16); | |
1098 | ||
1099 | printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", | |
1100 | (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), | |
1101 | (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); | |
1102 | ||
1103 | target->status = SRP_PORT_REDIRECT; | |
1104 | } else { | |
1105 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); | |
1106 | target->status = -ECONNRESET; | |
1107 | } | |
1108 | break; | |
1109 | ||
1110 | case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: | |
1111 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); | |
1112 | target->status = -ECONNRESET; | |
1113 | break; | |
1114 | ||
1115 | case IB_CM_REJ_CONSUMER_DEFINED: | |
1116 | opcode = *(u8 *) event->private_data; | |
1117 | if (opcode == SRP_LOGIN_REJ) { | |
1118 | struct srp_login_rej *rej = event->private_data; | |
1119 | u32 reason = be32_to_cpu(rej->reason); | |
1120 | ||
1121 | if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) | |
1122 | printk(KERN_WARNING PFX | |
1123 | "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); | |
1124 | else | |
1125 | printk(KERN_WARNING PFX | |
1126 | "SRP LOGIN REJECTED, reason 0x%08x\n", reason); | |
1127 | } else | |
1128 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," | |
1129 | " opcode 0x%02x\n", opcode); | |
1130 | target->status = -ECONNRESET; | |
1131 | break; | |
1132 | ||
1133 | default: | |
1134 | printk(KERN_WARNING " REJ reason 0x%x\n", | |
1135 | event->param.rej_rcvd.reason); | |
1136 | target->status = -ECONNRESET; | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
1141 | { | |
1142 | struct srp_target_port *target = cm_id->context; | |
1143 | struct ib_qp_attr *qp_attr = NULL; | |
1144 | int attr_mask = 0; | |
1145 | int comp = 0; | |
1146 | int opcode = 0; | |
1147 | ||
1148 | switch (event->event) { | |
1149 | case IB_CM_REQ_ERROR: | |
1150 | printk(KERN_DEBUG PFX "Sending CM REQ failed\n"); | |
1151 | comp = 1; | |
1152 | target->status = -ECONNRESET; | |
1153 | break; | |
1154 | ||
1155 | case IB_CM_REP_RECEIVED: | |
1156 | comp = 1; | |
1157 | opcode = *(u8 *) event->private_data; | |
1158 | ||
1159 | if (opcode == SRP_LOGIN_RSP) { | |
1160 | struct srp_login_rsp *rsp = event->private_data; | |
1161 | ||
1162 | target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len); | |
1163 | target->req_lim = be32_to_cpu(rsp->req_lim_delta); | |
1164 | ||
1165 | target->scsi_host->can_queue = min(target->req_lim, | |
1166 | target->scsi_host->can_queue); | |
1167 | } else { | |
1168 | printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode); | |
1169 | target->status = -ECONNRESET; | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | target->status = srp_alloc_iu_bufs(target); | |
1174 | if (target->status) | |
1175 | break; | |
1176 | ||
1177 | qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); | |
1178 | if (!qp_attr) { | |
1179 | target->status = -ENOMEM; | |
1180 | break; | |
1181 | } | |
1182 | ||
1183 | qp_attr->qp_state = IB_QPS_RTR; | |
1184 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1185 | if (target->status) | |
1186 | break; | |
1187 | ||
1188 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1189 | if (target->status) | |
1190 | break; | |
1191 | ||
1192 | target->status = srp_post_recv(target); | |
1193 | if (target->status) | |
1194 | break; | |
1195 | ||
1196 | qp_attr->qp_state = IB_QPS_RTS; | |
1197 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1198 | if (target->status) | |
1199 | break; | |
1200 | ||
1201 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1202 | if (target->status) | |
1203 | break; | |
1204 | ||
1205 | target->status = ib_send_cm_rtu(cm_id, NULL, 0); | |
1206 | if (target->status) | |
1207 | break; | |
1208 | ||
1209 | break; | |
1210 | ||
1211 | case IB_CM_REJ_RECEIVED: | |
1212 | printk(KERN_DEBUG PFX "REJ received\n"); | |
1213 | comp = 1; | |
1214 | ||
1215 | srp_cm_rej_handler(cm_id, event, target); | |
1216 | break; | |
1217 | ||
b7ac4ab4 IR |
1218 | case IB_CM_DREQ_RECEIVED: |
1219 | printk(KERN_WARNING PFX "DREQ received - connection closed\n"); | |
1220 | if (ib_send_cm_drep(cm_id, NULL, 0)) | |
1221 | printk(KERN_ERR PFX "Sending CM DREP failed\n"); | |
aef9ec39 RD |
1222 | break; |
1223 | ||
1224 | case IB_CM_TIMEWAIT_EXIT: | |
1225 | printk(KERN_ERR PFX "connection closed\n"); | |
1226 | ||
1227 | comp = 1; | |
1228 | target->status = 0; | |
1229 | break; | |
1230 | ||
b7ac4ab4 IR |
1231 | case IB_CM_MRA_RECEIVED: |
1232 | case IB_CM_DREQ_ERROR: | |
1233 | case IB_CM_DREP_RECEIVED: | |
1234 | break; | |
1235 | ||
aef9ec39 RD |
1236 | default: |
1237 | printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event); | |
1238 | break; | |
1239 | } | |
1240 | ||
1241 | if (comp) | |
1242 | complete(&target->done); | |
1243 | ||
1244 | kfree(qp_attr); | |
1245 | ||
1246 | return 0; | |
1247 | } | |
1248 | ||
d945e1df RD |
1249 | static int srp_send_tsk_mgmt(struct srp_target_port *target, |
1250 | struct srp_request *req, u8 func) | |
aef9ec39 | 1251 | { |
aef9ec39 RD |
1252 | struct srp_iu *iu; |
1253 | struct srp_tsk_mgmt *tsk_mgmt; | |
aef9ec39 RD |
1254 | |
1255 | spin_lock_irq(target->scsi_host->host_lock); | |
1256 | ||
1285b3a0 RD |
1257 | if (target->state == SRP_TARGET_DEAD || |
1258 | target->state == SRP_TARGET_REMOVED) { | |
d945e1df | 1259 | req->scmnd->result = DID_BAD_TARGET << 16; |
1285b3a0 RD |
1260 | goto out; |
1261 | } | |
1262 | ||
aef9ec39 RD |
1263 | init_completion(&req->done); |
1264 | ||
1265 | iu = __srp_get_tx_iu(target); | |
1266 | if (!iu) | |
1267 | goto out; | |
1268 | ||
1269 | tsk_mgmt = iu->buf; | |
1270 | memset(tsk_mgmt, 0, sizeof *tsk_mgmt); | |
1271 | ||
1272 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
d945e1df RD |
1273 | tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48); |
1274 | tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT; | |
aef9ec39 | 1275 | tsk_mgmt->tsk_mgmt_func = func; |
d945e1df | 1276 | tsk_mgmt->task_tag = req->index; |
aef9ec39 RD |
1277 | |
1278 | if (__srp_post_send(target, iu, sizeof *tsk_mgmt)) | |
1279 | goto out; | |
1280 | ||
1281 | req->tsk_mgmt = iu; | |
1282 | ||
1283 | spin_unlock_irq(target->scsi_host->host_lock); | |
d945e1df | 1284 | |
aef9ec39 RD |
1285 | if (!wait_for_completion_timeout(&req->done, |
1286 | msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) | |
d945e1df | 1287 | return -1; |
aef9ec39 | 1288 | |
d945e1df | 1289 | return 0; |
aef9ec39 RD |
1290 | |
1291 | out: | |
1292 | spin_unlock_irq(target->scsi_host->host_lock); | |
d945e1df RD |
1293 | return -1; |
1294 | } | |
1295 | ||
1296 | static int srp_find_req(struct srp_target_port *target, | |
1297 | struct scsi_cmnd *scmnd, | |
1298 | struct srp_request **req) | |
1299 | { | |
1300 | if (scmnd->host_scribble == (void *) -1L) | |
1301 | return -1; | |
1302 | ||
1303 | *req = &target->req_ring[(long) scmnd->host_scribble]; | |
1304 | ||
1305 | return 0; | |
aef9ec39 RD |
1306 | } |
1307 | ||
1308 | static int srp_abort(struct scsi_cmnd *scmnd) | |
1309 | { | |
d945e1df RD |
1310 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
1311 | struct srp_request *req; | |
1312 | int ret = SUCCESS; | |
1313 | ||
aef9ec39 RD |
1314 | printk(KERN_ERR "SRP abort called\n"); |
1315 | ||
d945e1df RD |
1316 | if (srp_find_req(target, scmnd, &req)) |
1317 | return FAILED; | |
1318 | if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK)) | |
1319 | return FAILED; | |
1320 | ||
1321 | spin_lock_irq(target->scsi_host->host_lock); | |
1322 | ||
1323 | if (req->cmd_done) { | |
1324 | srp_remove_req(target, req); | |
1325 | scmnd->scsi_done(scmnd); | |
1326 | } else if (!req->tsk_status) { | |
1327 | srp_remove_req(target, req); | |
1328 | scmnd->result = DID_ABORT << 16; | |
1329 | } else | |
1330 | ret = FAILED; | |
1331 | ||
1332 | spin_unlock_irq(target->scsi_host->host_lock); | |
1333 | ||
1334 | return ret; | |
aef9ec39 RD |
1335 | } |
1336 | ||
1337 | static int srp_reset_device(struct scsi_cmnd *scmnd) | |
1338 | { | |
d945e1df RD |
1339 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
1340 | struct srp_request *req, *tmp; | |
1341 | ||
aef9ec39 RD |
1342 | printk(KERN_ERR "SRP reset_device called\n"); |
1343 | ||
d945e1df RD |
1344 | if (srp_find_req(target, scmnd, &req)) |
1345 | return FAILED; | |
1346 | if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET)) | |
1347 | return FAILED; | |
1348 | if (req->tsk_status) | |
1349 | return FAILED; | |
1350 | ||
1351 | spin_lock_irq(target->scsi_host->host_lock); | |
1352 | ||
1353 | list_for_each_entry_safe(req, tmp, &target->req_queue, list) | |
526b4caa IR |
1354 | if (req->scmnd->device == scmnd->device) |
1355 | srp_reset_req(target, req); | |
d945e1df RD |
1356 | |
1357 | spin_unlock_irq(target->scsi_host->host_lock); | |
1358 | ||
1359 | return SUCCESS; | |
aef9ec39 RD |
1360 | } |
1361 | ||
1362 | static int srp_reset_host(struct scsi_cmnd *scmnd) | |
1363 | { | |
1364 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
1365 | int ret = FAILED; | |
1366 | ||
1367 | printk(KERN_ERR PFX "SRP reset_host called\n"); | |
1368 | ||
1369 | if (!srp_reconnect_target(target)) | |
1370 | ret = SUCCESS; | |
1371 | ||
1372 | return ret; | |
1373 | } | |
1374 | ||
6ecb0c84 RD |
1375 | static ssize_t show_id_ext(struct class_device *cdev, char *buf) |
1376 | { | |
1377 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1378 | ||
1379 | if (target->state == SRP_TARGET_DEAD || | |
1380 | target->state == SRP_TARGET_REMOVED) | |
1381 | return -ENODEV; | |
1382 | ||
1383 | return sprintf(buf, "0x%016llx\n", | |
1384 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1385 | } | |
1386 | ||
1387 | static ssize_t show_ioc_guid(struct class_device *cdev, char *buf) | |
1388 | { | |
1389 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1390 | ||
1391 | if (target->state == SRP_TARGET_DEAD || | |
1392 | target->state == SRP_TARGET_REMOVED) | |
1393 | return -ENODEV; | |
1394 | ||
1395 | return sprintf(buf, "0x%016llx\n", | |
1396 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
1397 | } | |
1398 | ||
1399 | static ssize_t show_service_id(struct class_device *cdev, char *buf) | |
1400 | { | |
1401 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1402 | ||
1403 | if (target->state == SRP_TARGET_DEAD || | |
1404 | target->state == SRP_TARGET_REMOVED) | |
1405 | return -ENODEV; | |
1406 | ||
1407 | return sprintf(buf, "0x%016llx\n", | |
1408 | (unsigned long long) be64_to_cpu(target->service_id)); | |
1409 | } | |
1410 | ||
1411 | static ssize_t show_pkey(struct class_device *cdev, char *buf) | |
1412 | { | |
1413 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1414 | ||
1415 | if (target->state == SRP_TARGET_DEAD || | |
1416 | target->state == SRP_TARGET_REMOVED) | |
1417 | return -ENODEV; | |
1418 | ||
1419 | return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); | |
1420 | } | |
1421 | ||
1422 | static ssize_t show_dgid(struct class_device *cdev, char *buf) | |
1423 | { | |
1424 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1425 | ||
1426 | if (target->state == SRP_TARGET_DEAD || | |
1427 | target->state == SRP_TARGET_REMOVED) | |
1428 | return -ENODEV; | |
1429 | ||
1430 | return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
1431 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]), | |
1432 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]), | |
1433 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]), | |
1434 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]), | |
1435 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]), | |
1436 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]), | |
1437 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]), | |
1438 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[7])); | |
1439 | } | |
1440 | ||
6bfa24fa RD |
1441 | static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf) |
1442 | { | |
1443 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1444 | ||
1445 | if (target->state == SRP_TARGET_DEAD || | |
1446 | target->state == SRP_TARGET_REMOVED) | |
1447 | return -ENODEV; | |
1448 | ||
1449 | return sprintf(buf, "%d\n", target->zero_req_lim); | |
1450 | } | |
1451 | ||
ded7f1a1 IR |
1452 | static ssize_t show_local_ib_port(struct class_device *cdev, char *buf) |
1453 | { | |
1454 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1455 | ||
1456 | return sprintf(buf, "%d\n", target->srp_host->port); | |
1457 | } | |
1458 | ||
1459 | static ssize_t show_local_ib_device(struct class_device *cdev, char *buf) | |
1460 | { | |
1461 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1462 | ||
1463 | return sprintf(buf, "%s\n", target->srp_host->dev->dev->name); | |
1464 | } | |
1465 | ||
1466 | static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); | |
1467 | static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); | |
1468 | static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); | |
1469 | static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); | |
1470 | static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); | |
1471 | static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); | |
1472 | static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); | |
1473 | static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); | |
6ecb0c84 RD |
1474 | |
1475 | static struct class_device_attribute *srp_host_attrs[] = { | |
1476 | &class_device_attr_id_ext, | |
1477 | &class_device_attr_ioc_guid, | |
1478 | &class_device_attr_service_id, | |
1479 | &class_device_attr_pkey, | |
1480 | &class_device_attr_dgid, | |
6bfa24fa | 1481 | &class_device_attr_zero_req_lim, |
ded7f1a1 IR |
1482 | &class_device_attr_local_ib_port, |
1483 | &class_device_attr_local_ib_device, | |
6ecb0c84 RD |
1484 | NULL |
1485 | }; | |
1486 | ||
aef9ec39 RD |
1487 | static struct scsi_host_template srp_template = { |
1488 | .module = THIS_MODULE, | |
1489 | .name = DRV_NAME, | |
1490 | .info = srp_target_info, | |
1491 | .queuecommand = srp_queuecommand, | |
1492 | .eh_abort_handler = srp_abort, | |
1493 | .eh_device_reset_handler = srp_reset_device, | |
1494 | .eh_host_reset_handler = srp_reset_host, | |
1495 | .can_queue = SRP_SQ_SIZE, | |
1496 | .this_id = -1, | |
aef9ec39 | 1497 | .cmd_per_lun = SRP_SQ_SIZE, |
6ecb0c84 RD |
1498 | .use_clustering = ENABLE_CLUSTERING, |
1499 | .shost_attrs = srp_host_attrs | |
aef9ec39 RD |
1500 | }; |
1501 | ||
1502 | static int srp_add_target(struct srp_host *host, struct srp_target_port *target) | |
1503 | { | |
1504 | sprintf(target->target_name, "SRP.T10:%016llX", | |
1505 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1506 | ||
f5358a17 | 1507 | if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device)) |
aef9ec39 RD |
1508 | return -ENODEV; |
1509 | ||
b3589fd4 | 1510 | spin_lock(&host->target_lock); |
aef9ec39 | 1511 | list_add_tail(&target->list, &host->target_list); |
b3589fd4 | 1512 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
1513 | |
1514 | target->state = SRP_TARGET_LIVE; | |
1515 | ||
aef9ec39 | 1516 | scsi_scan_target(&target->scsi_host->shost_gendev, |
1962a4a1 | 1517 | 0, target->scsi_id, SCAN_WILD_CARD, 0); |
aef9ec39 RD |
1518 | |
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | static void srp_release_class_dev(struct class_device *class_dev) | |
1523 | { | |
1524 | struct srp_host *host = | |
1525 | container_of(class_dev, struct srp_host, class_dev); | |
1526 | ||
1527 | complete(&host->released); | |
1528 | } | |
1529 | ||
1530 | static struct class srp_class = { | |
1531 | .name = "infiniband_srp", | |
1532 | .release = srp_release_class_dev | |
1533 | }; | |
1534 | ||
1535 | /* | |
1536 | * Target ports are added by writing | |
1537 | * | |
1538 | * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, | |
1539 | * pkey=<P_Key>,service_id=<service ID> | |
1540 | * | |
1541 | * to the add_target sysfs attribute. | |
1542 | */ | |
1543 | enum { | |
1544 | SRP_OPT_ERR = 0, | |
1545 | SRP_OPT_ID_EXT = 1 << 0, | |
1546 | SRP_OPT_IOC_GUID = 1 << 1, | |
1547 | SRP_OPT_DGID = 1 << 2, | |
1548 | SRP_OPT_PKEY = 1 << 3, | |
1549 | SRP_OPT_SERVICE_ID = 1 << 4, | |
1550 | SRP_OPT_MAX_SECT = 1 << 5, | |
52fb2b50 | 1551 | SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, |
0c0450db | 1552 | SRP_OPT_IO_CLASS = 1 << 7, |
aef9ec39 RD |
1553 | SRP_OPT_ALL = (SRP_OPT_ID_EXT | |
1554 | SRP_OPT_IOC_GUID | | |
1555 | SRP_OPT_DGID | | |
1556 | SRP_OPT_PKEY | | |
1557 | SRP_OPT_SERVICE_ID), | |
1558 | }; | |
1559 | ||
1560 | static match_table_t srp_opt_tokens = { | |
52fb2b50 VP |
1561 | { SRP_OPT_ID_EXT, "id_ext=%s" }, |
1562 | { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, | |
1563 | { SRP_OPT_DGID, "dgid=%s" }, | |
1564 | { SRP_OPT_PKEY, "pkey=%x" }, | |
1565 | { SRP_OPT_SERVICE_ID, "service_id=%s" }, | |
1566 | { SRP_OPT_MAX_SECT, "max_sect=%d" }, | |
1567 | { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, | |
0c0450db | 1568 | { SRP_OPT_IO_CLASS, "io_class=%x" }, |
52fb2b50 | 1569 | { SRP_OPT_ERR, NULL } |
aef9ec39 RD |
1570 | }; |
1571 | ||
1572 | static int srp_parse_options(const char *buf, struct srp_target_port *target) | |
1573 | { | |
1574 | char *options, *sep_opt; | |
1575 | char *p; | |
1576 | char dgid[3]; | |
1577 | substring_t args[MAX_OPT_ARGS]; | |
1578 | int opt_mask = 0; | |
1579 | int token; | |
1580 | int ret = -EINVAL; | |
1581 | int i; | |
1582 | ||
1583 | options = kstrdup(buf, GFP_KERNEL); | |
1584 | if (!options) | |
1585 | return -ENOMEM; | |
1586 | ||
1587 | sep_opt = options; | |
1588 | while ((p = strsep(&sep_opt, ",")) != NULL) { | |
1589 | if (!*p) | |
1590 | continue; | |
1591 | ||
1592 | token = match_token(p, srp_opt_tokens, args); | |
1593 | opt_mask |= token; | |
1594 | ||
1595 | switch (token) { | |
1596 | case SRP_OPT_ID_EXT: | |
1597 | p = match_strdup(args); | |
1598 | target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1599 | kfree(p); | |
1600 | break; | |
1601 | ||
1602 | case SRP_OPT_IOC_GUID: | |
1603 | p = match_strdup(args); | |
1604 | target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1605 | kfree(p); | |
1606 | break; | |
1607 | ||
1608 | case SRP_OPT_DGID: | |
1609 | p = match_strdup(args); | |
1610 | if (strlen(p) != 32) { | |
1611 | printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p); | |
ce1823f0 | 1612 | kfree(p); |
aef9ec39 RD |
1613 | goto out; |
1614 | } | |
1615 | ||
1616 | for (i = 0; i < 16; ++i) { | |
1617 | strlcpy(dgid, p + i * 2, 3); | |
1618 | target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); | |
1619 | } | |
bf17c1c7 | 1620 | kfree(p); |
aef9ec39 RD |
1621 | break; |
1622 | ||
1623 | case SRP_OPT_PKEY: | |
1624 | if (match_hex(args, &token)) { | |
1625 | printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p); | |
1626 | goto out; | |
1627 | } | |
1628 | target->path.pkey = cpu_to_be16(token); | |
1629 | break; | |
1630 | ||
1631 | case SRP_OPT_SERVICE_ID: | |
1632 | p = match_strdup(args); | |
1633 | target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1634 | kfree(p); | |
1635 | break; | |
1636 | ||
1637 | case SRP_OPT_MAX_SECT: | |
1638 | if (match_int(args, &token)) { | |
1639 | printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p); | |
1640 | goto out; | |
1641 | } | |
1642 | target->scsi_host->max_sectors = token; | |
1643 | break; | |
1644 | ||
52fb2b50 VP |
1645 | case SRP_OPT_MAX_CMD_PER_LUN: |
1646 | if (match_int(args, &token)) { | |
1647 | printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p); | |
1648 | goto out; | |
1649 | } | |
1650 | target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE); | |
1651 | break; | |
1652 | ||
0c0450db R |
1653 | case SRP_OPT_IO_CLASS: |
1654 | if (match_hex(args, &token)) { | |
1655 | printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p); | |
1656 | goto out; | |
1657 | } | |
1658 | if (token != SRP_REV10_IB_IO_CLASS && | |
1659 | token != SRP_REV16A_IB_IO_CLASS) { | |
1660 | printk(KERN_WARNING PFX "unknown IO class parameter value" | |
1661 | " %x specified (use %x or %x).\n", | |
1662 | token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS); | |
1663 | goto out; | |
1664 | } | |
1665 | target->io_class = token; | |
1666 | break; | |
1667 | ||
aef9ec39 RD |
1668 | default: |
1669 | printk(KERN_WARNING PFX "unknown parameter or missing value " | |
1670 | "'%s' in target creation request\n", p); | |
1671 | goto out; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) | |
1676 | ret = 0; | |
1677 | else | |
1678 | for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) | |
1679 | if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && | |
1680 | !(srp_opt_tokens[i].token & opt_mask)) | |
1681 | printk(KERN_WARNING PFX "target creation request is " | |
1682 | "missing parameter '%s'\n", | |
1683 | srp_opt_tokens[i].pattern); | |
1684 | ||
1685 | out: | |
1686 | kfree(options); | |
1687 | return ret; | |
1688 | } | |
1689 | ||
1690 | static ssize_t srp_create_target(struct class_device *class_dev, | |
1691 | const char *buf, size_t count) | |
1692 | { | |
1693 | struct srp_host *host = | |
1694 | container_of(class_dev, struct srp_host, class_dev); | |
1695 | struct Scsi_Host *target_host; | |
1696 | struct srp_target_port *target; | |
1697 | int ret; | |
1698 | int i; | |
1699 | ||
1700 | target_host = scsi_host_alloc(&srp_template, | |
1701 | sizeof (struct srp_target_port)); | |
1702 | if (!target_host) | |
1703 | return -ENOMEM; | |
1704 | ||
5f068992 RD |
1705 | target_host->max_lun = SRP_MAX_LUN; |
1706 | ||
aef9ec39 RD |
1707 | target = host_to_target(target_host); |
1708 | memset(target, 0, sizeof *target); | |
1709 | ||
0c0450db | 1710 | target->io_class = SRP_REV16A_IB_IO_CLASS; |
aef9ec39 RD |
1711 | target->scsi_host = target_host; |
1712 | target->srp_host = host; | |
1713 | ||
d945e1df | 1714 | INIT_LIST_HEAD(&target->free_reqs); |
aef9ec39 | 1715 | INIT_LIST_HEAD(&target->req_queue); |
d945e1df RD |
1716 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
1717 | target->req_ring[i].index = i; | |
1718 | list_add_tail(&target->req_ring[i].list, &target->free_reqs); | |
1719 | } | |
aef9ec39 RD |
1720 | |
1721 | ret = srp_parse_options(buf, target); | |
1722 | if (ret) | |
1723 | goto err; | |
1724 | ||
f5358a17 | 1725 | ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid); |
aef9ec39 RD |
1726 | |
1727 | printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x " | |
1728 | "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
1729 | (unsigned long long) be64_to_cpu(target->id_ext), | |
1730 | (unsigned long long) be64_to_cpu(target->ioc_guid), | |
1731 | be16_to_cpu(target->path.pkey), | |
1732 | (unsigned long long) be64_to_cpu(target->service_id), | |
1733 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]), | |
1734 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]), | |
1735 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]), | |
1736 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]), | |
1737 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]), | |
1738 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]), | |
1739 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]), | |
1740 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14])); | |
1741 | ||
1742 | ret = srp_create_target_ib(target); | |
1743 | if (ret) | |
1744 | goto err; | |
1745 | ||
f5358a17 | 1746 | target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target); |
aef9ec39 RD |
1747 | if (IS_ERR(target->cm_id)) { |
1748 | ret = PTR_ERR(target->cm_id); | |
1749 | goto err_free; | |
1750 | } | |
1751 | ||
1752 | ret = srp_connect_target(target); | |
1753 | if (ret) { | |
1754 | printk(KERN_ERR PFX "Connection failed\n"); | |
1755 | goto err_cm_id; | |
1756 | } | |
1757 | ||
1758 | ret = srp_add_target(host, target); | |
1759 | if (ret) | |
1760 | goto err_disconnect; | |
1761 | ||
1762 | return count; | |
1763 | ||
1764 | err_disconnect: | |
1765 | srp_disconnect_target(target); | |
1766 | ||
1767 | err_cm_id: | |
1768 | ib_destroy_cm_id(target->cm_id); | |
1769 | ||
1770 | err_free: | |
1771 | srp_free_target_ib(target); | |
1772 | ||
1773 | err: | |
1774 | scsi_host_put(target_host); | |
1775 | ||
1776 | return ret; | |
1777 | } | |
1778 | ||
1779 | static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); | |
1780 | ||
1781 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) | |
1782 | { | |
1783 | struct srp_host *host = | |
1784 | container_of(class_dev, struct srp_host, class_dev); | |
1785 | ||
f5358a17 | 1786 | return sprintf(buf, "%s\n", host->dev->dev->name); |
aef9ec39 RD |
1787 | } |
1788 | ||
1789 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
1790 | ||
1791 | static ssize_t show_port(struct class_device *class_dev, char *buf) | |
1792 | { | |
1793 | struct srp_host *host = | |
1794 | container_of(class_dev, struct srp_host, class_dev); | |
1795 | ||
1796 | return sprintf(buf, "%d\n", host->port); | |
1797 | } | |
1798 | ||
1799 | static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); | |
1800 | ||
f5358a17 | 1801 | static struct srp_host *srp_add_port(struct srp_device *device, u8 port) |
aef9ec39 RD |
1802 | { |
1803 | struct srp_host *host; | |
1804 | ||
1805 | host = kzalloc(sizeof *host, GFP_KERNEL); | |
1806 | if (!host) | |
1807 | return NULL; | |
1808 | ||
1809 | INIT_LIST_HEAD(&host->target_list); | |
b3589fd4 | 1810 | spin_lock_init(&host->target_lock); |
aef9ec39 RD |
1811 | init_completion(&host->released); |
1812 | host->dev = device; | |
1813 | host->port = port; | |
1814 | ||
1815 | host->initiator_port_id[7] = port; | |
f5358a17 | 1816 | memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8); |
aef9ec39 RD |
1817 | |
1818 | host->class_dev.class = &srp_class; | |
f5358a17 | 1819 | host->class_dev.dev = device->dev->dma_device; |
aef9ec39 | 1820 | snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d", |
f5358a17 | 1821 | device->dev->name, port); |
aef9ec39 RD |
1822 | |
1823 | if (class_device_register(&host->class_dev)) | |
f5358a17 | 1824 | goto free_host; |
aef9ec39 RD |
1825 | if (class_device_create_file(&host->class_dev, &class_device_attr_add_target)) |
1826 | goto err_class; | |
1827 | if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev)) | |
1828 | goto err_class; | |
1829 | if (class_device_create_file(&host->class_dev, &class_device_attr_port)) | |
1830 | goto err_class; | |
1831 | ||
1832 | return host; | |
1833 | ||
1834 | err_class: | |
1835 | class_device_unregister(&host->class_dev); | |
1836 | ||
f5358a17 | 1837 | free_host: |
aef9ec39 RD |
1838 | kfree(host); |
1839 | ||
1840 | return NULL; | |
1841 | } | |
1842 | ||
1843 | static void srp_add_one(struct ib_device *device) | |
1844 | { | |
f5358a17 RD |
1845 | struct srp_device *srp_dev; |
1846 | struct ib_device_attr *dev_attr; | |
1847 | struct ib_fmr_pool_param fmr_param; | |
aef9ec39 | 1848 | struct srp_host *host; |
aef9ec39 RD |
1849 | int s, e, p; |
1850 | ||
f5358a17 RD |
1851 | dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); |
1852 | if (!dev_attr) | |
cf311cd4 | 1853 | return; |
aef9ec39 | 1854 | |
f5358a17 RD |
1855 | if (ib_query_device(device, dev_attr)) { |
1856 | printk(KERN_WARNING PFX "Query device failed for %s\n", | |
1857 | device->name); | |
1858 | goto free_attr; | |
1859 | } | |
1860 | ||
1861 | srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); | |
1862 | if (!srp_dev) | |
1863 | goto free_attr; | |
1864 | ||
1865 | /* | |
1866 | * Use the smallest page size supported by the HCA, down to a | |
1867 | * minimum of 512 bytes (which is the smallest sector that a | |
1868 | * SCSI command will ever carry). | |
1869 | */ | |
1870 | srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1); | |
1871 | srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift; | |
1872 | srp_dev->fmr_page_mask = ~((unsigned long) srp_dev->fmr_page_size - 1); | |
1873 | ||
1874 | INIT_LIST_HEAD(&srp_dev->dev_list); | |
1875 | ||
1876 | srp_dev->dev = device; | |
1877 | srp_dev->pd = ib_alloc_pd(device); | |
1878 | if (IS_ERR(srp_dev->pd)) | |
1879 | goto free_dev; | |
1880 | ||
1881 | srp_dev->mr = ib_get_dma_mr(srp_dev->pd, | |
1882 | IB_ACCESS_LOCAL_WRITE | | |
1883 | IB_ACCESS_REMOTE_READ | | |
1884 | IB_ACCESS_REMOTE_WRITE); | |
1885 | if (IS_ERR(srp_dev->mr)) | |
1886 | goto err_pd; | |
1887 | ||
1888 | memset(&fmr_param, 0, sizeof fmr_param); | |
1889 | fmr_param.pool_size = SRP_FMR_POOL_SIZE; | |
1890 | fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; | |
1891 | fmr_param.cache = 1; | |
1892 | fmr_param.max_pages_per_fmr = SRP_FMR_SIZE; | |
1893 | fmr_param.page_shift = srp_dev->fmr_page_shift; | |
1894 | fmr_param.access = (IB_ACCESS_LOCAL_WRITE | | |
1895 | IB_ACCESS_REMOTE_WRITE | | |
1896 | IB_ACCESS_REMOTE_READ); | |
1897 | ||
1898 | srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); | |
1899 | if (IS_ERR(srp_dev->fmr_pool)) | |
1900 | srp_dev->fmr_pool = NULL; | |
aef9ec39 | 1901 | |
07ebafba | 1902 | if (device->node_type == RDMA_NODE_IB_SWITCH) { |
aef9ec39 RD |
1903 | s = 0; |
1904 | e = 0; | |
1905 | } else { | |
1906 | s = 1; | |
1907 | e = device->phys_port_cnt; | |
1908 | } | |
1909 | ||
1910 | for (p = s; p <= e; ++p) { | |
f5358a17 | 1911 | host = srp_add_port(srp_dev, p); |
aef9ec39 | 1912 | if (host) |
f5358a17 | 1913 | list_add_tail(&host->list, &srp_dev->dev_list); |
aef9ec39 RD |
1914 | } |
1915 | ||
f5358a17 RD |
1916 | ib_set_client_data(device, &srp_client, srp_dev); |
1917 | ||
1918 | goto free_attr; | |
1919 | ||
1920 | err_pd: | |
1921 | ib_dealloc_pd(srp_dev->pd); | |
1922 | ||
1923 | free_dev: | |
1924 | kfree(srp_dev); | |
1925 | ||
1926 | free_attr: | |
1927 | kfree(dev_attr); | |
aef9ec39 RD |
1928 | } |
1929 | ||
1930 | static void srp_remove_one(struct ib_device *device) | |
1931 | { | |
f5358a17 | 1932 | struct srp_device *srp_dev; |
aef9ec39 RD |
1933 | struct srp_host *host, *tmp_host; |
1934 | LIST_HEAD(target_list); | |
1935 | struct srp_target_port *target, *tmp_target; | |
aef9ec39 | 1936 | |
f5358a17 | 1937 | srp_dev = ib_get_client_data(device, &srp_client); |
aef9ec39 | 1938 | |
f5358a17 | 1939 | list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { |
aef9ec39 RD |
1940 | class_device_unregister(&host->class_dev); |
1941 | /* | |
1942 | * Wait for the sysfs entry to go away, so that no new | |
1943 | * target ports can be created. | |
1944 | */ | |
1945 | wait_for_completion(&host->released); | |
1946 | ||
1947 | /* | |
1948 | * Mark all target ports as removed, so we stop queueing | |
1949 | * commands and don't try to reconnect. | |
1950 | */ | |
b3589fd4 | 1951 | spin_lock(&host->target_lock); |
549c5fc2 | 1952 | list_for_each_entry(target, &host->target_list, list) { |
0c5b3952 IR |
1953 | spin_lock_irq(target->scsi_host->host_lock); |
1954 | target->state = SRP_TARGET_REMOVED; | |
1955 | spin_unlock_irq(target->scsi_host->host_lock); | |
aef9ec39 | 1956 | } |
b3589fd4 | 1957 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
1958 | |
1959 | /* | |
1960 | * Wait for any reconnection tasks that may have | |
1961 | * started before we marked our target ports as | |
1962 | * removed, and any target port removal tasks. | |
1963 | */ | |
1964 | flush_scheduled_work(); | |
1965 | ||
1966 | list_for_each_entry_safe(target, tmp_target, | |
1967 | &host->target_list, list) { | |
1968 | scsi_remove_host(target->scsi_host); | |
1969 | srp_disconnect_target(target); | |
1970 | ib_destroy_cm_id(target->cm_id); | |
1971 | srp_free_target_ib(target); | |
1972 | scsi_host_put(target->scsi_host); | |
1973 | } | |
1974 | ||
aef9ec39 RD |
1975 | kfree(host); |
1976 | } | |
1977 | ||
f5358a17 RD |
1978 | if (srp_dev->fmr_pool) |
1979 | ib_destroy_fmr_pool(srp_dev->fmr_pool); | |
1980 | ib_dereg_mr(srp_dev->mr); | |
1981 | ib_dealloc_pd(srp_dev->pd); | |
1982 | ||
1983 | kfree(srp_dev); | |
aef9ec39 RD |
1984 | } |
1985 | ||
1986 | static int __init srp_init_module(void) | |
1987 | { | |
1988 | int ret; | |
1989 | ||
74b0a15b VP |
1990 | srp_template.sg_tablesize = srp_sg_tablesize; |
1991 | srp_max_iu_len = (sizeof (struct srp_cmd) + | |
1992 | sizeof (struct srp_indirect_buf) + | |
1993 | srp_sg_tablesize * 16); | |
1994 | ||
aef9ec39 RD |
1995 | ret = class_register(&srp_class); |
1996 | if (ret) { | |
1997 | printk(KERN_ERR PFX "couldn't register class infiniband_srp\n"); | |
1998 | return ret; | |
1999 | } | |
2000 | ||
2001 | ret = ib_register_client(&srp_client); | |
2002 | if (ret) { | |
2003 | printk(KERN_ERR PFX "couldn't register IB client\n"); | |
2004 | class_unregister(&srp_class); | |
2005 | return ret; | |
2006 | } | |
2007 | ||
2008 | return 0; | |
2009 | } | |
2010 | ||
2011 | static void __exit srp_cleanup_module(void) | |
2012 | { | |
2013 | ib_unregister_client(&srp_client); | |
2014 | class_unregister(&srp_class); | |
2015 | } | |
2016 | ||
2017 | module_init(srp_init_module); | |
2018 | module_exit(srp_cleanup_module); |