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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 | ||
c1a0b23b MT |
99 | static struct ib_sa_client srp_sa_client; |
100 | ||
aef9ec39 RD |
101 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) |
102 | { | |
103 | return (struct srp_target_port *) host->hostdata; | |
104 | } | |
105 | ||
106 | static const char *srp_target_info(struct Scsi_Host *host) | |
107 | { | |
108 | return host_to_target(host)->target_name; | |
109 | } | |
110 | ||
111 | static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, | |
112 | gfp_t gfp_mask, | |
113 | enum dma_data_direction direction) | |
114 | { | |
115 | struct srp_iu *iu; | |
116 | ||
117 | iu = kmalloc(sizeof *iu, gfp_mask); | |
118 | if (!iu) | |
119 | goto out; | |
120 | ||
121 | iu->buf = kzalloc(size, gfp_mask); | |
122 | if (!iu->buf) | |
123 | goto out_free_iu; | |
124 | ||
f5358a17 RD |
125 | iu->dma = dma_map_single(host->dev->dev->dma_device, |
126 | iu->buf, size, direction); | |
aef9ec39 RD |
127 | if (dma_mapping_error(iu->dma)) |
128 | goto out_free_buf; | |
129 | ||
130 | iu->size = size; | |
131 | iu->direction = direction; | |
132 | ||
133 | return iu; | |
134 | ||
135 | out_free_buf: | |
136 | kfree(iu->buf); | |
137 | out_free_iu: | |
138 | kfree(iu); | |
139 | out: | |
140 | return NULL; | |
141 | } | |
142 | ||
143 | static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) | |
144 | { | |
145 | if (!iu) | |
146 | return; | |
147 | ||
f5358a17 RD |
148 | dma_unmap_single(host->dev->dev->dma_device, |
149 | iu->dma, iu->size, iu->direction); | |
aef9ec39 RD |
150 | kfree(iu->buf); |
151 | kfree(iu); | |
152 | } | |
153 | ||
154 | static void srp_qp_event(struct ib_event *event, void *context) | |
155 | { | |
156 | printk(KERN_ERR PFX "QP event %d\n", event->event); | |
157 | } | |
158 | ||
159 | static int srp_init_qp(struct srp_target_port *target, | |
160 | struct ib_qp *qp) | |
161 | { | |
162 | struct ib_qp_attr *attr; | |
163 | int ret; | |
164 | ||
165 | attr = kmalloc(sizeof *attr, GFP_KERNEL); | |
166 | if (!attr) | |
167 | return -ENOMEM; | |
168 | ||
f5358a17 | 169 | ret = ib_find_cached_pkey(target->srp_host->dev->dev, |
aef9ec39 RD |
170 | target->srp_host->port, |
171 | be16_to_cpu(target->path.pkey), | |
172 | &attr->pkey_index); | |
173 | if (ret) | |
174 | goto out; | |
175 | ||
176 | attr->qp_state = IB_QPS_INIT; | |
177 | attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | | |
178 | IB_ACCESS_REMOTE_WRITE); | |
179 | attr->port_num = target->srp_host->port; | |
180 | ||
181 | ret = ib_modify_qp(qp, attr, | |
182 | IB_QP_STATE | | |
183 | IB_QP_PKEY_INDEX | | |
184 | IB_QP_ACCESS_FLAGS | | |
185 | IB_QP_PORT); | |
186 | ||
187 | out: | |
188 | kfree(attr); | |
189 | return ret; | |
190 | } | |
191 | ||
192 | static int srp_create_target_ib(struct srp_target_port *target) | |
193 | { | |
194 | struct ib_qp_init_attr *init_attr; | |
195 | int ret; | |
196 | ||
197 | init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); | |
198 | if (!init_attr) | |
199 | return -ENOMEM; | |
200 | ||
f5358a17 | 201 | target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion, |
aef9ec39 RD |
202 | NULL, target, SRP_CQ_SIZE); |
203 | if (IS_ERR(target->cq)) { | |
204 | ret = PTR_ERR(target->cq); | |
205 | goto out; | |
206 | } | |
207 | ||
208 | ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP); | |
209 | ||
210 | init_attr->event_handler = srp_qp_event; | |
211 | init_attr->cap.max_send_wr = SRP_SQ_SIZE; | |
212 | init_attr->cap.max_recv_wr = SRP_RQ_SIZE; | |
213 | init_attr->cap.max_recv_sge = 1; | |
214 | init_attr->cap.max_send_sge = 1; | |
215 | init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; | |
216 | init_attr->qp_type = IB_QPT_RC; | |
217 | init_attr->send_cq = target->cq; | |
218 | init_attr->recv_cq = target->cq; | |
219 | ||
f5358a17 | 220 | target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr); |
aef9ec39 RD |
221 | if (IS_ERR(target->qp)) { |
222 | ret = PTR_ERR(target->qp); | |
223 | ib_destroy_cq(target->cq); | |
224 | goto out; | |
225 | } | |
226 | ||
227 | ret = srp_init_qp(target, target->qp); | |
228 | if (ret) { | |
229 | ib_destroy_qp(target->qp); | |
230 | ib_destroy_cq(target->cq); | |
231 | goto out; | |
232 | } | |
233 | ||
234 | out: | |
235 | kfree(init_attr); | |
236 | return ret; | |
237 | } | |
238 | ||
239 | static void srp_free_target_ib(struct srp_target_port *target) | |
240 | { | |
241 | int i; | |
242 | ||
243 | ib_destroy_qp(target->qp); | |
244 | ib_destroy_cq(target->cq); | |
245 | ||
246 | for (i = 0; i < SRP_RQ_SIZE; ++i) | |
247 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
248 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) | |
249 | srp_free_iu(target->srp_host, target->tx_ring[i]); | |
250 | } | |
251 | ||
252 | static void srp_path_rec_completion(int status, | |
253 | struct ib_sa_path_rec *pathrec, | |
254 | void *target_ptr) | |
255 | { | |
256 | struct srp_target_port *target = target_ptr; | |
257 | ||
258 | target->status = status; | |
259 | if (status) | |
260 | printk(KERN_ERR PFX "Got failed path rec status %d\n", status); | |
261 | else | |
262 | target->path = *pathrec; | |
263 | complete(&target->done); | |
264 | } | |
265 | ||
266 | static int srp_lookup_path(struct srp_target_port *target) | |
267 | { | |
268 | target->path.numb_path = 1; | |
269 | ||
270 | init_completion(&target->done); | |
271 | ||
c1a0b23b MT |
272 | target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, |
273 | target->srp_host->dev->dev, | |
aef9ec39 RD |
274 | target->srp_host->port, |
275 | &target->path, | |
276 | IB_SA_PATH_REC_DGID | | |
277 | IB_SA_PATH_REC_SGID | | |
278 | IB_SA_PATH_REC_NUMB_PATH | | |
279 | IB_SA_PATH_REC_PKEY, | |
280 | SRP_PATH_REC_TIMEOUT_MS, | |
281 | GFP_KERNEL, | |
282 | srp_path_rec_completion, | |
283 | target, &target->path_query); | |
284 | if (target->path_query_id < 0) | |
285 | return target->path_query_id; | |
286 | ||
287 | wait_for_completion(&target->done); | |
288 | ||
289 | if (target->status < 0) | |
290 | printk(KERN_WARNING PFX "Path record query failed\n"); | |
291 | ||
292 | return target->status; | |
293 | } | |
294 | ||
295 | static int srp_send_req(struct srp_target_port *target) | |
296 | { | |
297 | struct { | |
298 | struct ib_cm_req_param param; | |
299 | struct srp_login_req priv; | |
300 | } *req = NULL; | |
301 | int status; | |
302 | ||
303 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
304 | if (!req) | |
305 | return -ENOMEM; | |
306 | ||
307 | req->param.primary_path = &target->path; | |
308 | req->param.alternate_path = NULL; | |
309 | req->param.service_id = target->service_id; | |
310 | req->param.qp_num = target->qp->qp_num; | |
311 | req->param.qp_type = target->qp->qp_type; | |
312 | req->param.private_data = &req->priv; | |
313 | req->param.private_data_len = sizeof req->priv; | |
314 | req->param.flow_control = 1; | |
315 | ||
316 | get_random_bytes(&req->param.starting_psn, 4); | |
317 | req->param.starting_psn &= 0xffffff; | |
318 | ||
319 | /* | |
320 | * Pick some arbitrary defaults here; we could make these | |
321 | * module parameters if anyone cared about setting them. | |
322 | */ | |
323 | req->param.responder_resources = 4; | |
324 | req->param.remote_cm_response_timeout = 20; | |
325 | req->param.local_cm_response_timeout = 20; | |
326 | req->param.retry_count = 7; | |
327 | req->param.rnr_retry_count = 7; | |
328 | req->param.max_cm_retries = 15; | |
329 | ||
330 | req->priv.opcode = SRP_LOGIN_REQ; | |
331 | req->priv.tag = 0; | |
74b0a15b | 332 | req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len); |
aef9ec39 RD |
333 | req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
334 | SRP_BUF_FORMAT_INDIRECT); | |
0c0450db | 335 | /* |
3cd96564 | 336 | * In the published SRP specification (draft rev. 16a), the |
0c0450db R |
337 | * port identifier format is 8 bytes of ID extension followed |
338 | * by 8 bytes of GUID. Older drafts put the two halves in the | |
339 | * opposite order, so that the GUID comes first. | |
340 | * | |
341 | * Targets conforming to these obsolete drafts can be | |
342 | * recognized by the I/O Class they report. | |
343 | */ | |
344 | if (target->io_class == SRP_REV10_IB_IO_CLASS) { | |
345 | memcpy(req->priv.initiator_port_id, | |
346 | target->srp_host->initiator_port_id + 8, 8); | |
347 | memcpy(req->priv.initiator_port_id + 8, | |
348 | target->srp_host->initiator_port_id, 8); | |
349 | memcpy(req->priv.target_port_id, &target->ioc_guid, 8); | |
350 | memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); | |
351 | } else { | |
352 | memcpy(req->priv.initiator_port_id, | |
353 | target->srp_host->initiator_port_id, 16); | |
354 | memcpy(req->priv.target_port_id, &target->id_ext, 8); | |
355 | memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); | |
356 | } | |
357 | ||
aef9ec39 RD |
358 | /* |
359 | * Topspin/Cisco SRP targets will reject our login unless we | |
360 | * zero out the first 8 bytes of our initiator port ID. The | |
361 | * second 8 bytes must be our local node GUID, but we always | |
362 | * use that anyway. | |
363 | */ | |
364 | if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) { | |
365 | printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround " | |
366 | "activated for target GUID %016llx\n", | |
367 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
368 | memset(req->priv.initiator_port_id, 0, 8); | |
369 | } | |
aef9ec39 RD |
370 | |
371 | status = ib_send_cm_req(target->cm_id, &req->param); | |
372 | ||
373 | kfree(req); | |
374 | ||
375 | return status; | |
376 | } | |
377 | ||
378 | static void srp_disconnect_target(struct srp_target_port *target) | |
379 | { | |
380 | /* XXX should send SRP_I_LOGOUT request */ | |
381 | ||
382 | init_completion(&target->done); | |
e6581056 RD |
383 | if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { |
384 | printk(KERN_DEBUG PFX "Sending CM DREQ failed\n"); | |
385 | return; | |
386 | } | |
aef9ec39 RD |
387 | wait_for_completion(&target->done); |
388 | } | |
389 | ||
390 | static void srp_remove_work(void *target_ptr) | |
391 | { | |
392 | struct srp_target_port *target = target_ptr; | |
393 | ||
394 | spin_lock_irq(target->scsi_host->host_lock); | |
395 | if (target->state != SRP_TARGET_DEAD) { | |
396 | spin_unlock_irq(target->scsi_host->host_lock); | |
aef9ec39 RD |
397 | return; |
398 | } | |
399 | target->state = SRP_TARGET_REMOVED; | |
400 | spin_unlock_irq(target->scsi_host->host_lock); | |
401 | ||
b3589fd4 | 402 | spin_lock(&target->srp_host->target_lock); |
aef9ec39 | 403 | list_del(&target->list); |
b3589fd4 | 404 | spin_unlock(&target->srp_host->target_lock); |
aef9ec39 RD |
405 | |
406 | scsi_remove_host(target->scsi_host); | |
407 | ib_destroy_cm_id(target->cm_id); | |
408 | srp_free_target_ib(target); | |
409 | scsi_host_put(target->scsi_host); | |
aef9ec39 RD |
410 | } |
411 | ||
412 | static int srp_connect_target(struct srp_target_port *target) | |
413 | { | |
414 | int ret; | |
415 | ||
416 | ret = srp_lookup_path(target); | |
417 | if (ret) | |
418 | return ret; | |
419 | ||
420 | while (1) { | |
421 | init_completion(&target->done); | |
422 | ret = srp_send_req(target); | |
423 | if (ret) | |
424 | return ret; | |
425 | wait_for_completion(&target->done); | |
426 | ||
427 | /* | |
428 | * The CM event handling code will set status to | |
429 | * SRP_PORT_REDIRECT if we get a port redirect REJ | |
430 | * back, or SRP_DLID_REDIRECT if we get a lid/qp | |
431 | * redirect REJ back. | |
432 | */ | |
433 | switch (target->status) { | |
434 | case 0: | |
435 | return 0; | |
436 | ||
437 | case SRP_PORT_REDIRECT: | |
438 | ret = srp_lookup_path(target); | |
439 | if (ret) | |
440 | return ret; | |
441 | break; | |
442 | ||
443 | case SRP_DLID_REDIRECT: | |
444 | break; | |
445 | ||
446 | default: | |
447 | return target->status; | |
448 | } | |
449 | } | |
450 | } | |
451 | ||
d945e1df RD |
452 | static void srp_unmap_data(struct scsi_cmnd *scmnd, |
453 | struct srp_target_port *target, | |
454 | struct srp_request *req) | |
455 | { | |
456 | struct scatterlist *scat; | |
457 | int nents; | |
458 | ||
459 | if (!scmnd->request_buffer || | |
460 | (scmnd->sc_data_direction != DMA_TO_DEVICE && | |
461 | scmnd->sc_data_direction != DMA_FROM_DEVICE)) | |
462 | return; | |
463 | ||
f5358a17 RD |
464 | if (req->fmr) { |
465 | ib_fmr_pool_unmap(req->fmr); | |
466 | req->fmr = NULL; | |
467 | } | |
468 | ||
d945e1df RD |
469 | /* |
470 | * This handling of non-SG commands can be killed when the | |
471 | * SCSI midlayer no longer generates non-SG commands. | |
472 | */ | |
473 | if (likely(scmnd->use_sg)) { | |
474 | nents = scmnd->use_sg; | |
475 | scat = scmnd->request_buffer; | |
476 | } else { | |
477 | nents = 1; | |
478 | scat = &req->fake_sg; | |
479 | } | |
480 | ||
f5358a17 | 481 | dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents, |
d945e1df RD |
482 | scmnd->sc_data_direction); |
483 | } | |
484 | ||
526b4caa IR |
485 | static void srp_remove_req(struct srp_target_port *target, struct srp_request *req) |
486 | { | |
487 | srp_unmap_data(req->scmnd, target, req); | |
488 | list_move_tail(&req->list, &target->free_reqs); | |
489 | } | |
490 | ||
491 | static void srp_reset_req(struct srp_target_port *target, struct srp_request *req) | |
492 | { | |
493 | req->scmnd->result = DID_RESET << 16; | |
494 | req->scmnd->scsi_done(req->scmnd); | |
495 | srp_remove_req(target, req); | |
496 | } | |
497 | ||
aef9ec39 RD |
498 | static int srp_reconnect_target(struct srp_target_port *target) |
499 | { | |
500 | struct ib_cm_id *new_cm_id; | |
501 | struct ib_qp_attr qp_attr; | |
526b4caa | 502 | struct srp_request *req, *tmp; |
aef9ec39 RD |
503 | struct ib_wc wc; |
504 | int ret; | |
aef9ec39 RD |
505 | |
506 | spin_lock_irq(target->scsi_host->host_lock); | |
507 | if (target->state != SRP_TARGET_LIVE) { | |
508 | spin_unlock_irq(target->scsi_host->host_lock); | |
509 | return -EAGAIN; | |
510 | } | |
511 | target->state = SRP_TARGET_CONNECTING; | |
512 | spin_unlock_irq(target->scsi_host->host_lock); | |
513 | ||
514 | srp_disconnect_target(target); | |
515 | /* | |
516 | * Now get a new local CM ID so that we avoid confusing the | |
517 | * target in case things are really fouled up. | |
518 | */ | |
f5358a17 | 519 | new_cm_id = ib_create_cm_id(target->srp_host->dev->dev, |
aef9ec39 RD |
520 | srp_cm_handler, target); |
521 | if (IS_ERR(new_cm_id)) { | |
522 | ret = PTR_ERR(new_cm_id); | |
523 | goto err; | |
524 | } | |
525 | ib_destroy_cm_id(target->cm_id); | |
526 | target->cm_id = new_cm_id; | |
527 | ||
528 | qp_attr.qp_state = IB_QPS_RESET; | |
529 | ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE); | |
530 | if (ret) | |
531 | goto err; | |
532 | ||
533 | ret = srp_init_qp(target, target->qp); | |
534 | if (ret) | |
535 | goto err; | |
536 | ||
537 | while (ib_poll_cq(target->cq, 1, &wc) > 0) | |
538 | ; /* nothing */ | |
539 | ||
d916a8f1 | 540 | spin_lock_irq(target->scsi_host->host_lock); |
526b4caa IR |
541 | list_for_each_entry_safe(req, tmp, &target->req_queue, list) |
542 | srp_reset_req(target, req); | |
d916a8f1 | 543 | spin_unlock_irq(target->scsi_host->host_lock); |
aef9ec39 RD |
544 | |
545 | target->rx_head = 0; | |
546 | target->tx_head = 0; | |
547 | target->tx_tail = 0; | |
aef9ec39 RD |
548 | |
549 | ret = srp_connect_target(target); | |
550 | if (ret) | |
551 | goto err; | |
552 | ||
553 | spin_lock_irq(target->scsi_host->host_lock); | |
554 | if (target->state == SRP_TARGET_CONNECTING) { | |
555 | ret = 0; | |
556 | target->state = SRP_TARGET_LIVE; | |
557 | } else | |
558 | ret = -EAGAIN; | |
559 | spin_unlock_irq(target->scsi_host->host_lock); | |
560 | ||
561 | return ret; | |
562 | ||
563 | err: | |
564 | printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret); | |
565 | ||
566 | /* | |
567 | * We couldn't reconnect, so kill our target port off. | |
568 | * However, we have to defer the real removal because we might | |
569 | * be in the context of the SCSI error handler now, which | |
570 | * would deadlock if we call scsi_remove_host(). | |
571 | */ | |
572 | spin_lock_irq(target->scsi_host->host_lock); | |
573 | if (target->state == SRP_TARGET_CONNECTING) { | |
574 | target->state = SRP_TARGET_DEAD; | |
575 | INIT_WORK(&target->work, srp_remove_work, target); | |
576 | schedule_work(&target->work); | |
577 | } | |
578 | spin_unlock_irq(target->scsi_host->host_lock); | |
579 | ||
580 | return ret; | |
581 | } | |
582 | ||
559ce8f1 | 583 | static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat, |
f5358a17 RD |
584 | int sg_cnt, struct srp_request *req, |
585 | struct srp_direct_buf *buf) | |
586 | { | |
587 | u64 io_addr = 0; | |
588 | u64 *dma_pages; | |
589 | u32 len; | |
590 | int page_cnt; | |
591 | int i, j; | |
592 | int ret; | |
559ce8f1 | 593 | struct srp_device *dev = target->srp_host->dev; |
f5358a17 RD |
594 | |
595 | if (!dev->fmr_pool) | |
596 | return -ENODEV; | |
597 | ||
559ce8f1 IR |
598 | if ((sg_dma_address(&scat[0]) & ~dev->fmr_page_mask) && |
599 | mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3)) | |
600 | return -EINVAL; | |
601 | ||
f5358a17 RD |
602 | len = page_cnt = 0; |
603 | for (i = 0; i < sg_cnt; ++i) { | |
604 | if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) { | |
605 | if (i > 0) | |
606 | return -EINVAL; | |
607 | else | |
608 | ++page_cnt; | |
609 | } | |
610 | if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) & | |
611 | ~dev->fmr_page_mask) { | |
612 | if (i < sg_cnt - 1) | |
613 | return -EINVAL; | |
614 | else | |
615 | ++page_cnt; | |
616 | } | |
617 | ||
618 | len += sg_dma_len(&scat[i]); | |
619 | } | |
620 | ||
621 | page_cnt += len >> dev->fmr_page_shift; | |
622 | if (page_cnt > SRP_FMR_SIZE) | |
623 | return -ENOMEM; | |
624 | ||
625 | dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC); | |
626 | if (!dma_pages) | |
627 | return -ENOMEM; | |
628 | ||
629 | page_cnt = 0; | |
630 | for (i = 0; i < sg_cnt; ++i) | |
631 | for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size) | |
632 | dma_pages[page_cnt++] = | |
633 | (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j; | |
634 | ||
635 | req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool, | |
adfaa888 | 636 | dma_pages, page_cnt, io_addr); |
f5358a17 RD |
637 | if (IS_ERR(req->fmr)) { |
638 | ret = PTR_ERR(req->fmr); | |
6583eb3d | 639 | req->fmr = NULL; |
f5358a17 RD |
640 | goto out; |
641 | } | |
642 | ||
643 | buf->va = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask); | |
644 | buf->key = cpu_to_be32(req->fmr->fmr->rkey); | |
645 | buf->len = cpu_to_be32(len); | |
646 | ||
647 | ret = 0; | |
648 | ||
649 | out: | |
650 | kfree(dma_pages); | |
651 | ||
652 | return ret; | |
653 | } | |
654 | ||
aef9ec39 RD |
655 | static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, |
656 | struct srp_request *req) | |
657 | { | |
cf368713 | 658 | struct scatterlist *scat; |
aef9ec39 | 659 | struct srp_cmd *cmd = req->cmd->buf; |
cf368713 | 660 | int len, nents, count; |
f5358a17 | 661 | u8 fmt = SRP_DATA_DESC_DIRECT; |
aef9ec39 RD |
662 | |
663 | if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE) | |
664 | return sizeof (struct srp_cmd); | |
665 | ||
666 | if (scmnd->sc_data_direction != DMA_FROM_DEVICE && | |
667 | scmnd->sc_data_direction != DMA_TO_DEVICE) { | |
668 | printk(KERN_WARNING PFX "Unhandled data direction %d\n", | |
669 | scmnd->sc_data_direction); | |
670 | return -EINVAL; | |
671 | } | |
672 | ||
cf368713 RD |
673 | /* |
674 | * This handling of non-SG commands can be killed when the | |
675 | * SCSI midlayer no longer generates non-SG commands. | |
676 | */ | |
677 | if (likely(scmnd->use_sg)) { | |
678 | nents = scmnd->use_sg; | |
679 | scat = scmnd->request_buffer; | |
680 | } else { | |
681 | nents = 1; | |
682 | scat = &req->fake_sg; | |
683 | sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen); | |
684 | } | |
aef9ec39 | 685 | |
f5358a17 RD |
686 | count = dma_map_sg(target->srp_host->dev->dev->dma_device, |
687 | scat, nents, scmnd->sc_data_direction); | |
688 | ||
689 | fmt = SRP_DATA_DESC_DIRECT; | |
690 | len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); | |
aef9ec39 | 691 | |
cf368713 | 692 | if (count == 1) { |
f5358a17 RD |
693 | /* |
694 | * The midlayer only generated a single gather/scatter | |
695 | * entry, or DMA mapping coalesced everything to a | |
696 | * single entry. So a direct descriptor along with | |
697 | * the DMA MR suffices. | |
698 | */ | |
cf368713 | 699 | struct srp_direct_buf *buf = (void *) cmd->add_data; |
aef9ec39 | 700 | |
cf368713 | 701 | buf->va = cpu_to_be64(sg_dma_address(scat)); |
f5358a17 | 702 | buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey); |
cf368713 | 703 | buf->len = cpu_to_be32(sg_dma_len(scat)); |
559ce8f1 | 704 | } else if (srp_map_fmr(target, scat, count, req, |
f5358a17 RD |
705 | (void *) cmd->add_data)) { |
706 | /* | |
707 | * FMR mapping failed, and the scatterlist has more | |
708 | * than one entry. Generate an indirect memory | |
709 | * descriptor. | |
710 | */ | |
cf368713 RD |
711 | struct srp_indirect_buf *buf = (void *) cmd->add_data; |
712 | u32 datalen = 0; | |
f5358a17 | 713 | int i; |
aef9ec39 | 714 | |
cf368713 | 715 | fmt = SRP_DATA_DESC_INDIRECT; |
f5358a17 RD |
716 | len = sizeof (struct srp_cmd) + |
717 | sizeof (struct srp_indirect_buf) + | |
718 | count * sizeof (struct srp_direct_buf); | |
719 | ||
720 | for (i = 0; i < count; ++i) { | |
721 | buf->desc_list[i].va = | |
722 | cpu_to_be64(sg_dma_address(&scat[i])); | |
723 | buf->desc_list[i].key = | |
724 | cpu_to_be32(target->srp_host->dev->mr->rkey); | |
725 | buf->desc_list[i].len = | |
726 | cpu_to_be32(sg_dma_len(&scat[i])); | |
727 | datalen += sg_dma_len(&scat[i]); | |
728 | } | |
aef9ec39 | 729 | |
cf368713 RD |
730 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) |
731 | cmd->data_out_desc_cnt = count; | |
732 | else | |
733 | cmd->data_in_desc_cnt = count; | |
734 | ||
f5358a17 RD |
735 | buf->table_desc.va = |
736 | cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf); | |
cf368713 | 737 | buf->table_desc.key = |
f5358a17 | 738 | cpu_to_be32(target->srp_host->dev->mr->rkey); |
cf368713 RD |
739 | buf->table_desc.len = |
740 | cpu_to_be32(count * sizeof (struct srp_direct_buf)); | |
741 | ||
cf368713 | 742 | buf->len = cpu_to_be32(datalen); |
aef9ec39 RD |
743 | } |
744 | ||
745 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) | |
746 | cmd->buf_fmt = fmt << 4; | |
747 | else | |
748 | cmd->buf_fmt = fmt; | |
749 | ||
aef9ec39 RD |
750 | return len; |
751 | } | |
752 | ||
aef9ec39 RD |
753 | static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) |
754 | { | |
755 | struct srp_request *req; | |
756 | struct scsi_cmnd *scmnd; | |
757 | unsigned long flags; | |
758 | s32 delta; | |
759 | ||
760 | delta = (s32) be32_to_cpu(rsp->req_lim_delta); | |
761 | ||
762 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
763 | ||
764 | target->req_lim += delta; | |
765 | ||
766 | req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT]; | |
767 | ||
768 | if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { | |
769 | if (be32_to_cpu(rsp->resp_data_len) < 4) | |
770 | req->tsk_status = -1; | |
771 | else | |
772 | req->tsk_status = rsp->data[3]; | |
773 | complete(&req->done); | |
774 | } else { | |
d945e1df | 775 | scmnd = req->scmnd; |
aef9ec39 RD |
776 | if (!scmnd) |
777 | printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n", | |
778 | (unsigned long long) rsp->tag); | |
779 | scmnd->result = rsp->status; | |
780 | ||
781 | if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { | |
782 | memcpy(scmnd->sense_buffer, rsp->data + | |
783 | be32_to_cpu(rsp->resp_data_len), | |
784 | min_t(int, be32_to_cpu(rsp->sense_data_len), | |
785 | SCSI_SENSE_BUFFERSIZE)); | |
786 | } | |
787 | ||
788 | if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) | |
789 | scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt); | |
790 | else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) | |
791 | scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt); | |
792 | ||
aef9ec39 | 793 | if (!req->tsk_mgmt) { |
aef9ec39 RD |
794 | scmnd->host_scribble = (void *) -1L; |
795 | scmnd->scsi_done(scmnd); | |
796 | ||
d945e1df | 797 | srp_remove_req(target, req); |
aef9ec39 RD |
798 | } else |
799 | req->cmd_done = 1; | |
800 | } | |
801 | ||
802 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
803 | } | |
804 | ||
aef9ec39 RD |
805 | static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) |
806 | { | |
807 | struct srp_iu *iu; | |
808 | u8 opcode; | |
809 | ||
810 | iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV]; | |
811 | ||
f5358a17 | 812 | dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma, |
aef9ec39 RD |
813 | target->max_ti_iu_len, DMA_FROM_DEVICE); |
814 | ||
815 | opcode = *(u8 *) iu->buf; | |
816 | ||
817 | if (0) { | |
818 | int i; | |
819 | ||
820 | printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode); | |
821 | ||
822 | for (i = 0; i < wc->byte_len; ++i) { | |
823 | if (i % 8 == 0) | |
824 | printk(KERN_ERR " [%02x] ", i); | |
825 | printk(" %02x", ((u8 *) iu->buf)[i]); | |
826 | if ((i + 1) % 8 == 0) | |
827 | printk("\n"); | |
828 | } | |
829 | ||
830 | if (wc->byte_len % 8) | |
831 | printk("\n"); | |
832 | } | |
833 | ||
834 | switch (opcode) { | |
835 | case SRP_RSP: | |
836 | srp_process_rsp(target, iu->buf); | |
837 | break; | |
838 | ||
839 | case SRP_T_LOGOUT: | |
840 | /* XXX Handle target logout */ | |
841 | printk(KERN_WARNING PFX "Got target logout request\n"); | |
842 | break; | |
843 | ||
844 | default: | |
845 | printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode); | |
846 | break; | |
847 | } | |
848 | ||
f5358a17 | 849 | dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma, |
aef9ec39 RD |
850 | target->max_ti_iu_len, DMA_FROM_DEVICE); |
851 | } | |
852 | ||
853 | static void srp_completion(struct ib_cq *cq, void *target_ptr) | |
854 | { | |
855 | struct srp_target_port *target = target_ptr; | |
856 | struct ib_wc wc; | |
aef9ec39 RD |
857 | |
858 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
859 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
860 | if (wc.status) { | |
861 | printk(KERN_ERR PFX "failed %s status %d\n", | |
862 | wc.wr_id & SRP_OP_RECV ? "receive" : "send", | |
863 | wc.status); | |
aef9ec39 RD |
864 | break; |
865 | } | |
866 | ||
867 | if (wc.wr_id & SRP_OP_RECV) | |
868 | srp_handle_recv(target, &wc); | |
869 | else | |
870 | ++target->tx_tail; | |
871 | } | |
872 | } | |
873 | ||
874 | static int __srp_post_recv(struct srp_target_port *target) | |
875 | { | |
876 | struct srp_iu *iu; | |
877 | struct ib_sge list; | |
878 | struct ib_recv_wr wr, *bad_wr; | |
879 | unsigned int next; | |
880 | int ret; | |
881 | ||
882 | next = target->rx_head & (SRP_RQ_SIZE - 1); | |
883 | wr.wr_id = next | SRP_OP_RECV; | |
884 | iu = target->rx_ring[next]; | |
885 | ||
886 | list.addr = iu->dma; | |
887 | list.length = iu->size; | |
f5358a17 | 888 | list.lkey = target->srp_host->dev->mr->lkey; |
aef9ec39 RD |
889 | |
890 | wr.next = NULL; | |
891 | wr.sg_list = &list; | |
892 | wr.num_sge = 1; | |
893 | ||
894 | ret = ib_post_recv(target->qp, &wr, &bad_wr); | |
895 | if (!ret) | |
896 | ++target->rx_head; | |
897 | ||
898 | return ret; | |
899 | } | |
900 | ||
901 | static int srp_post_recv(struct srp_target_port *target) | |
902 | { | |
903 | unsigned long flags; | |
904 | int ret; | |
905 | ||
906 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
907 | ret = __srp_post_recv(target); | |
908 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
909 | ||
910 | return ret; | |
911 | } | |
912 | ||
913 | /* | |
914 | * Must be called with target->scsi_host->host_lock held to protect | |
47f2bce9 RD |
915 | * req_lim and tx_head. Lock cannot be dropped between call here and |
916 | * call to __srp_post_send(). | |
aef9ec39 RD |
917 | */ |
918 | static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target) | |
919 | { | |
920 | if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE) | |
921 | return NULL; | |
922 | ||
6bfa24fa RD |
923 | if (unlikely(target->req_lim < 1)) |
924 | ++target->zero_req_lim; | |
47f2bce9 | 925 | |
aef9ec39 RD |
926 | return target->tx_ring[target->tx_head & SRP_SQ_SIZE]; |
927 | } | |
928 | ||
929 | /* | |
930 | * Must be called with target->scsi_host->host_lock held to protect | |
931 | * req_lim and tx_head. | |
932 | */ | |
933 | static int __srp_post_send(struct srp_target_port *target, | |
934 | struct srp_iu *iu, int len) | |
935 | { | |
936 | struct ib_sge list; | |
937 | struct ib_send_wr wr, *bad_wr; | |
938 | int ret = 0; | |
939 | ||
aef9ec39 RD |
940 | list.addr = iu->dma; |
941 | list.length = len; | |
f5358a17 | 942 | list.lkey = target->srp_host->dev->mr->lkey; |
aef9ec39 RD |
943 | |
944 | wr.next = NULL; | |
945 | wr.wr_id = target->tx_head & SRP_SQ_SIZE; | |
946 | wr.sg_list = &list; | |
947 | wr.num_sge = 1; | |
948 | wr.opcode = IB_WR_SEND; | |
949 | wr.send_flags = IB_SEND_SIGNALED; | |
950 | ||
951 | ret = ib_post_send(target->qp, &wr, &bad_wr); | |
952 | ||
953 | if (!ret) { | |
954 | ++target->tx_head; | |
955 | --target->req_lim; | |
956 | } | |
957 | ||
958 | return ret; | |
959 | } | |
960 | ||
961 | static int srp_queuecommand(struct scsi_cmnd *scmnd, | |
962 | void (*done)(struct scsi_cmnd *)) | |
963 | { | |
964 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
965 | struct srp_request *req; | |
966 | struct srp_iu *iu; | |
967 | struct srp_cmd *cmd; | |
aef9ec39 RD |
968 | int len; |
969 | ||
970 | if (target->state == SRP_TARGET_CONNECTING) | |
971 | goto err; | |
972 | ||
973 | if (target->state == SRP_TARGET_DEAD || | |
974 | target->state == SRP_TARGET_REMOVED) { | |
975 | scmnd->result = DID_BAD_TARGET << 16; | |
976 | done(scmnd); | |
977 | return 0; | |
978 | } | |
979 | ||
980 | iu = __srp_get_tx_iu(target); | |
981 | if (!iu) | |
982 | goto err; | |
983 | ||
f5358a17 | 984 | dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma, |
74b0a15b | 985 | srp_max_iu_len, DMA_TO_DEVICE); |
aef9ec39 | 986 | |
d945e1df | 987 | req = list_entry(target->free_reqs.next, struct srp_request, list); |
aef9ec39 RD |
988 | |
989 | scmnd->scsi_done = done; | |
990 | scmnd->result = 0; | |
d945e1df | 991 | scmnd->host_scribble = (void *) (long) req->index; |
aef9ec39 RD |
992 | |
993 | cmd = iu->buf; | |
994 | memset(cmd, 0, sizeof *cmd); | |
995 | ||
996 | cmd->opcode = SRP_CMD; | |
997 | cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); | |
d945e1df | 998 | cmd->tag = req->index; |
aef9ec39 RD |
999 | memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); |
1000 | ||
aef9ec39 RD |
1001 | req->scmnd = scmnd; |
1002 | req->cmd = iu; | |
1003 | req->cmd_done = 0; | |
1004 | req->tsk_mgmt = NULL; | |
1005 | ||
1006 | len = srp_map_data(scmnd, target, req); | |
1007 | if (len < 0) { | |
1008 | printk(KERN_ERR PFX "Failed to map data\n"); | |
1009 | goto err; | |
1010 | } | |
1011 | ||
1012 | if (__srp_post_recv(target)) { | |
1013 | printk(KERN_ERR PFX "Recv failed\n"); | |
1014 | goto err_unmap; | |
1015 | } | |
1016 | ||
f5358a17 | 1017 | dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma, |
74b0a15b | 1018 | srp_max_iu_len, DMA_TO_DEVICE); |
aef9ec39 RD |
1019 | |
1020 | if (__srp_post_send(target, iu, len)) { | |
1021 | printk(KERN_ERR PFX "Send failed\n"); | |
1022 | goto err_unmap; | |
1023 | } | |
1024 | ||
d945e1df | 1025 | list_move_tail(&req->list, &target->req_queue); |
aef9ec39 RD |
1026 | |
1027 | return 0; | |
1028 | ||
1029 | err_unmap: | |
1030 | srp_unmap_data(scmnd, target, req); | |
1031 | ||
1032 | err: | |
1033 | return SCSI_MLQUEUE_HOST_BUSY; | |
1034 | } | |
1035 | ||
1036 | static int srp_alloc_iu_bufs(struct srp_target_port *target) | |
1037 | { | |
1038 | int i; | |
1039 | ||
1040 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1041 | target->rx_ring[i] = srp_alloc_iu(target->srp_host, | |
1042 | target->max_ti_iu_len, | |
1043 | GFP_KERNEL, DMA_FROM_DEVICE); | |
1044 | if (!target->rx_ring[i]) | |
1045 | goto err; | |
1046 | } | |
1047 | ||
1048 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) { | |
1049 | target->tx_ring[i] = srp_alloc_iu(target->srp_host, | |
74b0a15b | 1050 | srp_max_iu_len, |
aef9ec39 RD |
1051 | GFP_KERNEL, DMA_TO_DEVICE); |
1052 | if (!target->tx_ring[i]) | |
1053 | goto err; | |
1054 | } | |
1055 | ||
1056 | return 0; | |
1057 | ||
1058 | err: | |
1059 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1060 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
1061 | target->rx_ring[i] = NULL; | |
1062 | } | |
1063 | ||
1064 | for (i = 0; i < SRP_SQ_SIZE + 1; ++i) { | |
1065 | srp_free_iu(target->srp_host, target->tx_ring[i]); | |
1066 | target->tx_ring[i] = NULL; | |
1067 | } | |
1068 | ||
1069 | return -ENOMEM; | |
1070 | } | |
1071 | ||
1072 | static void srp_cm_rej_handler(struct ib_cm_id *cm_id, | |
1073 | struct ib_cm_event *event, | |
1074 | struct srp_target_port *target) | |
1075 | { | |
1076 | struct ib_class_port_info *cpi; | |
1077 | int opcode; | |
1078 | ||
1079 | switch (event->param.rej_rcvd.reason) { | |
1080 | case IB_CM_REJ_PORT_CM_REDIRECT: | |
1081 | cpi = event->param.rej_rcvd.ari; | |
1082 | target->path.dlid = cpi->redirect_lid; | |
1083 | target->path.pkey = cpi->redirect_pkey; | |
1084 | cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; | |
1085 | memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); | |
1086 | ||
1087 | target->status = target->path.dlid ? | |
1088 | SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; | |
1089 | break; | |
1090 | ||
1091 | case IB_CM_REJ_PORT_REDIRECT: | |
1092 | if (topspin_workarounds && | |
1093 | !memcmp(&target->ioc_guid, topspin_oui, 3)) { | |
1094 | /* | |
1095 | * Topspin/Cisco SRP gateways incorrectly send | |
1096 | * reject reason code 25 when they mean 24 | |
1097 | * (port redirect). | |
1098 | */ | |
1099 | memcpy(target->path.dgid.raw, | |
1100 | event->param.rej_rcvd.ari, 16); | |
1101 | ||
1102 | printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", | |
1103 | (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), | |
1104 | (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); | |
1105 | ||
1106 | target->status = SRP_PORT_REDIRECT; | |
1107 | } else { | |
1108 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); | |
1109 | target->status = -ECONNRESET; | |
1110 | } | |
1111 | break; | |
1112 | ||
1113 | case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: | |
1114 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); | |
1115 | target->status = -ECONNRESET; | |
1116 | break; | |
1117 | ||
1118 | case IB_CM_REJ_CONSUMER_DEFINED: | |
1119 | opcode = *(u8 *) event->private_data; | |
1120 | if (opcode == SRP_LOGIN_REJ) { | |
1121 | struct srp_login_rej *rej = event->private_data; | |
1122 | u32 reason = be32_to_cpu(rej->reason); | |
1123 | ||
1124 | if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) | |
1125 | printk(KERN_WARNING PFX | |
1126 | "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); | |
1127 | else | |
1128 | printk(KERN_WARNING PFX | |
1129 | "SRP LOGIN REJECTED, reason 0x%08x\n", reason); | |
1130 | } else | |
1131 | printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," | |
1132 | " opcode 0x%02x\n", opcode); | |
1133 | target->status = -ECONNRESET; | |
1134 | break; | |
1135 | ||
1136 | default: | |
1137 | printk(KERN_WARNING " REJ reason 0x%x\n", | |
1138 | event->param.rej_rcvd.reason); | |
1139 | target->status = -ECONNRESET; | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
1144 | { | |
1145 | struct srp_target_port *target = cm_id->context; | |
1146 | struct ib_qp_attr *qp_attr = NULL; | |
1147 | int attr_mask = 0; | |
1148 | int comp = 0; | |
1149 | int opcode = 0; | |
1150 | ||
1151 | switch (event->event) { | |
1152 | case IB_CM_REQ_ERROR: | |
1153 | printk(KERN_DEBUG PFX "Sending CM REQ failed\n"); | |
1154 | comp = 1; | |
1155 | target->status = -ECONNRESET; | |
1156 | break; | |
1157 | ||
1158 | case IB_CM_REP_RECEIVED: | |
1159 | comp = 1; | |
1160 | opcode = *(u8 *) event->private_data; | |
1161 | ||
1162 | if (opcode == SRP_LOGIN_RSP) { | |
1163 | struct srp_login_rsp *rsp = event->private_data; | |
1164 | ||
1165 | target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len); | |
1166 | target->req_lim = be32_to_cpu(rsp->req_lim_delta); | |
1167 | ||
1168 | target->scsi_host->can_queue = min(target->req_lim, | |
1169 | target->scsi_host->can_queue); | |
1170 | } else { | |
1171 | printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode); | |
1172 | target->status = -ECONNRESET; | |
1173 | break; | |
1174 | } | |
1175 | ||
1176 | target->status = srp_alloc_iu_bufs(target); | |
1177 | if (target->status) | |
1178 | break; | |
1179 | ||
1180 | qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); | |
1181 | if (!qp_attr) { | |
1182 | target->status = -ENOMEM; | |
1183 | break; | |
1184 | } | |
1185 | ||
1186 | qp_attr->qp_state = IB_QPS_RTR; | |
1187 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1188 | if (target->status) | |
1189 | break; | |
1190 | ||
1191 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1192 | if (target->status) | |
1193 | break; | |
1194 | ||
1195 | target->status = srp_post_recv(target); | |
1196 | if (target->status) | |
1197 | break; | |
1198 | ||
1199 | qp_attr->qp_state = IB_QPS_RTS; | |
1200 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1201 | if (target->status) | |
1202 | break; | |
1203 | ||
1204 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1205 | if (target->status) | |
1206 | break; | |
1207 | ||
1208 | target->status = ib_send_cm_rtu(cm_id, NULL, 0); | |
1209 | if (target->status) | |
1210 | break; | |
1211 | ||
1212 | break; | |
1213 | ||
1214 | case IB_CM_REJ_RECEIVED: | |
1215 | printk(KERN_DEBUG PFX "REJ received\n"); | |
1216 | comp = 1; | |
1217 | ||
1218 | srp_cm_rej_handler(cm_id, event, target); | |
1219 | break; | |
1220 | ||
b7ac4ab4 IR |
1221 | case IB_CM_DREQ_RECEIVED: |
1222 | printk(KERN_WARNING PFX "DREQ received - connection closed\n"); | |
1223 | if (ib_send_cm_drep(cm_id, NULL, 0)) | |
1224 | printk(KERN_ERR PFX "Sending CM DREP failed\n"); | |
aef9ec39 RD |
1225 | break; |
1226 | ||
1227 | case IB_CM_TIMEWAIT_EXIT: | |
1228 | printk(KERN_ERR PFX "connection closed\n"); | |
1229 | ||
1230 | comp = 1; | |
1231 | target->status = 0; | |
1232 | break; | |
1233 | ||
b7ac4ab4 IR |
1234 | case IB_CM_MRA_RECEIVED: |
1235 | case IB_CM_DREQ_ERROR: | |
1236 | case IB_CM_DREP_RECEIVED: | |
1237 | break; | |
1238 | ||
aef9ec39 RD |
1239 | default: |
1240 | printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event); | |
1241 | break; | |
1242 | } | |
1243 | ||
1244 | if (comp) | |
1245 | complete(&target->done); | |
1246 | ||
1247 | kfree(qp_attr); | |
1248 | ||
1249 | return 0; | |
1250 | } | |
1251 | ||
d945e1df RD |
1252 | static int srp_send_tsk_mgmt(struct srp_target_port *target, |
1253 | struct srp_request *req, u8 func) | |
aef9ec39 | 1254 | { |
aef9ec39 RD |
1255 | struct srp_iu *iu; |
1256 | struct srp_tsk_mgmt *tsk_mgmt; | |
aef9ec39 RD |
1257 | |
1258 | spin_lock_irq(target->scsi_host->host_lock); | |
1259 | ||
1285b3a0 RD |
1260 | if (target->state == SRP_TARGET_DEAD || |
1261 | target->state == SRP_TARGET_REMOVED) { | |
d945e1df | 1262 | req->scmnd->result = DID_BAD_TARGET << 16; |
1285b3a0 RD |
1263 | goto out; |
1264 | } | |
1265 | ||
aef9ec39 RD |
1266 | init_completion(&req->done); |
1267 | ||
1268 | iu = __srp_get_tx_iu(target); | |
1269 | if (!iu) | |
1270 | goto out; | |
1271 | ||
1272 | tsk_mgmt = iu->buf; | |
1273 | memset(tsk_mgmt, 0, sizeof *tsk_mgmt); | |
1274 | ||
1275 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
d945e1df RD |
1276 | tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48); |
1277 | tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT; | |
aef9ec39 | 1278 | tsk_mgmt->tsk_mgmt_func = func; |
d945e1df | 1279 | tsk_mgmt->task_tag = req->index; |
aef9ec39 RD |
1280 | |
1281 | if (__srp_post_send(target, iu, sizeof *tsk_mgmt)) | |
1282 | goto out; | |
1283 | ||
1284 | req->tsk_mgmt = iu; | |
1285 | ||
1286 | spin_unlock_irq(target->scsi_host->host_lock); | |
d945e1df | 1287 | |
aef9ec39 RD |
1288 | if (!wait_for_completion_timeout(&req->done, |
1289 | msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) | |
d945e1df | 1290 | return -1; |
aef9ec39 | 1291 | |
d945e1df | 1292 | return 0; |
aef9ec39 RD |
1293 | |
1294 | out: | |
1295 | spin_unlock_irq(target->scsi_host->host_lock); | |
d945e1df RD |
1296 | return -1; |
1297 | } | |
1298 | ||
1299 | static int srp_find_req(struct srp_target_port *target, | |
1300 | struct scsi_cmnd *scmnd, | |
1301 | struct srp_request **req) | |
1302 | { | |
1303 | if (scmnd->host_scribble == (void *) -1L) | |
1304 | return -1; | |
1305 | ||
1306 | *req = &target->req_ring[(long) scmnd->host_scribble]; | |
1307 | ||
1308 | return 0; | |
aef9ec39 RD |
1309 | } |
1310 | ||
1311 | static int srp_abort(struct scsi_cmnd *scmnd) | |
1312 | { | |
d945e1df RD |
1313 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
1314 | struct srp_request *req; | |
1315 | int ret = SUCCESS; | |
1316 | ||
aef9ec39 RD |
1317 | printk(KERN_ERR "SRP abort called\n"); |
1318 | ||
d945e1df RD |
1319 | if (srp_find_req(target, scmnd, &req)) |
1320 | return FAILED; | |
1321 | if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK)) | |
1322 | return FAILED; | |
1323 | ||
1324 | spin_lock_irq(target->scsi_host->host_lock); | |
1325 | ||
1326 | if (req->cmd_done) { | |
1327 | srp_remove_req(target, req); | |
1328 | scmnd->scsi_done(scmnd); | |
1329 | } else if (!req->tsk_status) { | |
1330 | srp_remove_req(target, req); | |
1331 | scmnd->result = DID_ABORT << 16; | |
1332 | } else | |
1333 | ret = FAILED; | |
1334 | ||
1335 | spin_unlock_irq(target->scsi_host->host_lock); | |
1336 | ||
1337 | return ret; | |
aef9ec39 RD |
1338 | } |
1339 | ||
1340 | static int srp_reset_device(struct scsi_cmnd *scmnd) | |
1341 | { | |
d945e1df RD |
1342 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
1343 | struct srp_request *req, *tmp; | |
1344 | ||
aef9ec39 RD |
1345 | printk(KERN_ERR "SRP reset_device called\n"); |
1346 | ||
d945e1df RD |
1347 | if (srp_find_req(target, scmnd, &req)) |
1348 | return FAILED; | |
1349 | if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET)) | |
1350 | return FAILED; | |
1351 | if (req->tsk_status) | |
1352 | return FAILED; | |
1353 | ||
1354 | spin_lock_irq(target->scsi_host->host_lock); | |
1355 | ||
1356 | list_for_each_entry_safe(req, tmp, &target->req_queue, list) | |
526b4caa IR |
1357 | if (req->scmnd->device == scmnd->device) |
1358 | srp_reset_req(target, req); | |
d945e1df RD |
1359 | |
1360 | spin_unlock_irq(target->scsi_host->host_lock); | |
1361 | ||
1362 | return SUCCESS; | |
aef9ec39 RD |
1363 | } |
1364 | ||
1365 | static int srp_reset_host(struct scsi_cmnd *scmnd) | |
1366 | { | |
1367 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
1368 | int ret = FAILED; | |
1369 | ||
1370 | printk(KERN_ERR PFX "SRP reset_host called\n"); | |
1371 | ||
1372 | if (!srp_reconnect_target(target)) | |
1373 | ret = SUCCESS; | |
1374 | ||
1375 | return ret; | |
1376 | } | |
1377 | ||
6ecb0c84 RD |
1378 | static ssize_t show_id_ext(struct class_device *cdev, char *buf) |
1379 | { | |
1380 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1381 | ||
1382 | if (target->state == SRP_TARGET_DEAD || | |
1383 | target->state == SRP_TARGET_REMOVED) | |
1384 | return -ENODEV; | |
1385 | ||
1386 | return sprintf(buf, "0x%016llx\n", | |
1387 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1388 | } | |
1389 | ||
1390 | static ssize_t show_ioc_guid(struct class_device *cdev, char *buf) | |
1391 | { | |
1392 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1393 | ||
1394 | if (target->state == SRP_TARGET_DEAD || | |
1395 | target->state == SRP_TARGET_REMOVED) | |
1396 | return -ENODEV; | |
1397 | ||
1398 | return sprintf(buf, "0x%016llx\n", | |
1399 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
1400 | } | |
1401 | ||
1402 | static ssize_t show_service_id(struct class_device *cdev, char *buf) | |
1403 | { | |
1404 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1405 | ||
1406 | if (target->state == SRP_TARGET_DEAD || | |
1407 | target->state == SRP_TARGET_REMOVED) | |
1408 | return -ENODEV; | |
1409 | ||
1410 | return sprintf(buf, "0x%016llx\n", | |
1411 | (unsigned long long) be64_to_cpu(target->service_id)); | |
1412 | } | |
1413 | ||
1414 | static ssize_t show_pkey(struct class_device *cdev, char *buf) | |
1415 | { | |
1416 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1417 | ||
1418 | if (target->state == SRP_TARGET_DEAD || | |
1419 | target->state == SRP_TARGET_REMOVED) | |
1420 | return -ENODEV; | |
1421 | ||
1422 | return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); | |
1423 | } | |
1424 | ||
1425 | static ssize_t show_dgid(struct class_device *cdev, char *buf) | |
1426 | { | |
1427 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1428 | ||
1429 | if (target->state == SRP_TARGET_DEAD || | |
1430 | target->state == SRP_TARGET_REMOVED) | |
1431 | return -ENODEV; | |
1432 | ||
1433 | return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
1434 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]), | |
1435 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]), | |
1436 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]), | |
1437 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]), | |
1438 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]), | |
1439 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]), | |
1440 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]), | |
1441 | be16_to_cpu(((__be16 *) target->path.dgid.raw)[7])); | |
1442 | } | |
1443 | ||
6bfa24fa RD |
1444 | static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf) |
1445 | { | |
1446 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1447 | ||
1448 | if (target->state == SRP_TARGET_DEAD || | |
1449 | target->state == SRP_TARGET_REMOVED) | |
1450 | return -ENODEV; | |
1451 | ||
1452 | return sprintf(buf, "%d\n", target->zero_req_lim); | |
1453 | } | |
1454 | ||
ded7f1a1 IR |
1455 | static ssize_t show_local_ib_port(struct class_device *cdev, char *buf) |
1456 | { | |
1457 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1458 | ||
1459 | return sprintf(buf, "%d\n", target->srp_host->port); | |
1460 | } | |
1461 | ||
1462 | static ssize_t show_local_ib_device(struct class_device *cdev, char *buf) | |
1463 | { | |
1464 | struct srp_target_port *target = host_to_target(class_to_shost(cdev)); | |
1465 | ||
1466 | return sprintf(buf, "%s\n", target->srp_host->dev->dev->name); | |
1467 | } | |
1468 | ||
1469 | static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); | |
1470 | static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); | |
1471 | static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); | |
1472 | static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); | |
1473 | static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); | |
1474 | static CLASS_DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); | |
1475 | static CLASS_DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); | |
1476 | static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); | |
6ecb0c84 RD |
1477 | |
1478 | static struct class_device_attribute *srp_host_attrs[] = { | |
1479 | &class_device_attr_id_ext, | |
1480 | &class_device_attr_ioc_guid, | |
1481 | &class_device_attr_service_id, | |
1482 | &class_device_attr_pkey, | |
1483 | &class_device_attr_dgid, | |
6bfa24fa | 1484 | &class_device_attr_zero_req_lim, |
ded7f1a1 IR |
1485 | &class_device_attr_local_ib_port, |
1486 | &class_device_attr_local_ib_device, | |
6ecb0c84 RD |
1487 | NULL |
1488 | }; | |
1489 | ||
aef9ec39 RD |
1490 | static struct scsi_host_template srp_template = { |
1491 | .module = THIS_MODULE, | |
1492 | .name = DRV_NAME, | |
1493 | .info = srp_target_info, | |
1494 | .queuecommand = srp_queuecommand, | |
1495 | .eh_abort_handler = srp_abort, | |
1496 | .eh_device_reset_handler = srp_reset_device, | |
1497 | .eh_host_reset_handler = srp_reset_host, | |
1498 | .can_queue = SRP_SQ_SIZE, | |
1499 | .this_id = -1, | |
aef9ec39 | 1500 | .cmd_per_lun = SRP_SQ_SIZE, |
6ecb0c84 RD |
1501 | .use_clustering = ENABLE_CLUSTERING, |
1502 | .shost_attrs = srp_host_attrs | |
aef9ec39 RD |
1503 | }; |
1504 | ||
1505 | static int srp_add_target(struct srp_host *host, struct srp_target_port *target) | |
1506 | { | |
1507 | sprintf(target->target_name, "SRP.T10:%016llX", | |
1508 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1509 | ||
f5358a17 | 1510 | if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device)) |
aef9ec39 RD |
1511 | return -ENODEV; |
1512 | ||
b3589fd4 | 1513 | spin_lock(&host->target_lock); |
aef9ec39 | 1514 | list_add_tail(&target->list, &host->target_list); |
b3589fd4 | 1515 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
1516 | |
1517 | target->state = SRP_TARGET_LIVE; | |
1518 | ||
aef9ec39 | 1519 | scsi_scan_target(&target->scsi_host->shost_gendev, |
1962a4a1 | 1520 | 0, target->scsi_id, SCAN_WILD_CARD, 0); |
aef9ec39 RD |
1521 | |
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static void srp_release_class_dev(struct class_device *class_dev) | |
1526 | { | |
1527 | struct srp_host *host = | |
1528 | container_of(class_dev, struct srp_host, class_dev); | |
1529 | ||
1530 | complete(&host->released); | |
1531 | } | |
1532 | ||
1533 | static struct class srp_class = { | |
1534 | .name = "infiniband_srp", | |
1535 | .release = srp_release_class_dev | |
1536 | }; | |
1537 | ||
1538 | /* | |
1539 | * Target ports are added by writing | |
1540 | * | |
1541 | * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, | |
1542 | * pkey=<P_Key>,service_id=<service ID> | |
1543 | * | |
1544 | * to the add_target sysfs attribute. | |
1545 | */ | |
1546 | enum { | |
1547 | SRP_OPT_ERR = 0, | |
1548 | SRP_OPT_ID_EXT = 1 << 0, | |
1549 | SRP_OPT_IOC_GUID = 1 << 1, | |
1550 | SRP_OPT_DGID = 1 << 2, | |
1551 | SRP_OPT_PKEY = 1 << 3, | |
1552 | SRP_OPT_SERVICE_ID = 1 << 4, | |
1553 | SRP_OPT_MAX_SECT = 1 << 5, | |
52fb2b50 | 1554 | SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, |
0c0450db | 1555 | SRP_OPT_IO_CLASS = 1 << 7, |
aef9ec39 RD |
1556 | SRP_OPT_ALL = (SRP_OPT_ID_EXT | |
1557 | SRP_OPT_IOC_GUID | | |
1558 | SRP_OPT_DGID | | |
1559 | SRP_OPT_PKEY | | |
1560 | SRP_OPT_SERVICE_ID), | |
1561 | }; | |
1562 | ||
1563 | static match_table_t srp_opt_tokens = { | |
52fb2b50 VP |
1564 | { SRP_OPT_ID_EXT, "id_ext=%s" }, |
1565 | { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, | |
1566 | { SRP_OPT_DGID, "dgid=%s" }, | |
1567 | { SRP_OPT_PKEY, "pkey=%x" }, | |
1568 | { SRP_OPT_SERVICE_ID, "service_id=%s" }, | |
1569 | { SRP_OPT_MAX_SECT, "max_sect=%d" }, | |
1570 | { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, | |
0c0450db | 1571 | { SRP_OPT_IO_CLASS, "io_class=%x" }, |
52fb2b50 | 1572 | { SRP_OPT_ERR, NULL } |
aef9ec39 RD |
1573 | }; |
1574 | ||
1575 | static int srp_parse_options(const char *buf, struct srp_target_port *target) | |
1576 | { | |
1577 | char *options, *sep_opt; | |
1578 | char *p; | |
1579 | char dgid[3]; | |
1580 | substring_t args[MAX_OPT_ARGS]; | |
1581 | int opt_mask = 0; | |
1582 | int token; | |
1583 | int ret = -EINVAL; | |
1584 | int i; | |
1585 | ||
1586 | options = kstrdup(buf, GFP_KERNEL); | |
1587 | if (!options) | |
1588 | return -ENOMEM; | |
1589 | ||
1590 | sep_opt = options; | |
1591 | while ((p = strsep(&sep_opt, ",")) != NULL) { | |
1592 | if (!*p) | |
1593 | continue; | |
1594 | ||
1595 | token = match_token(p, srp_opt_tokens, args); | |
1596 | opt_mask |= token; | |
1597 | ||
1598 | switch (token) { | |
1599 | case SRP_OPT_ID_EXT: | |
1600 | p = match_strdup(args); | |
1601 | target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1602 | kfree(p); | |
1603 | break; | |
1604 | ||
1605 | case SRP_OPT_IOC_GUID: | |
1606 | p = match_strdup(args); | |
1607 | target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1608 | kfree(p); | |
1609 | break; | |
1610 | ||
1611 | case SRP_OPT_DGID: | |
1612 | p = match_strdup(args); | |
1613 | if (strlen(p) != 32) { | |
1614 | printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p); | |
ce1823f0 | 1615 | kfree(p); |
aef9ec39 RD |
1616 | goto out; |
1617 | } | |
1618 | ||
1619 | for (i = 0; i < 16; ++i) { | |
1620 | strlcpy(dgid, p + i * 2, 3); | |
1621 | target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); | |
1622 | } | |
bf17c1c7 | 1623 | kfree(p); |
aef9ec39 RD |
1624 | break; |
1625 | ||
1626 | case SRP_OPT_PKEY: | |
1627 | if (match_hex(args, &token)) { | |
1628 | printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p); | |
1629 | goto out; | |
1630 | } | |
1631 | target->path.pkey = cpu_to_be16(token); | |
1632 | break; | |
1633 | ||
1634 | case SRP_OPT_SERVICE_ID: | |
1635 | p = match_strdup(args); | |
1636 | target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); | |
1637 | kfree(p); | |
1638 | break; | |
1639 | ||
1640 | case SRP_OPT_MAX_SECT: | |
1641 | if (match_int(args, &token)) { | |
1642 | printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p); | |
1643 | goto out; | |
1644 | } | |
1645 | target->scsi_host->max_sectors = token; | |
1646 | break; | |
1647 | ||
52fb2b50 VP |
1648 | case SRP_OPT_MAX_CMD_PER_LUN: |
1649 | if (match_int(args, &token)) { | |
1650 | printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p); | |
1651 | goto out; | |
1652 | } | |
1653 | target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE); | |
1654 | break; | |
1655 | ||
0c0450db R |
1656 | case SRP_OPT_IO_CLASS: |
1657 | if (match_hex(args, &token)) { | |
1658 | printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p); | |
1659 | goto out; | |
1660 | } | |
1661 | if (token != SRP_REV10_IB_IO_CLASS && | |
1662 | token != SRP_REV16A_IB_IO_CLASS) { | |
1663 | printk(KERN_WARNING PFX "unknown IO class parameter value" | |
1664 | " %x specified (use %x or %x).\n", | |
1665 | token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS); | |
1666 | goto out; | |
1667 | } | |
1668 | target->io_class = token; | |
1669 | break; | |
1670 | ||
aef9ec39 RD |
1671 | default: |
1672 | printk(KERN_WARNING PFX "unknown parameter or missing value " | |
1673 | "'%s' in target creation request\n", p); | |
1674 | goto out; | |
1675 | } | |
1676 | } | |
1677 | ||
1678 | if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) | |
1679 | ret = 0; | |
1680 | else | |
1681 | for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) | |
1682 | if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && | |
1683 | !(srp_opt_tokens[i].token & opt_mask)) | |
1684 | printk(KERN_WARNING PFX "target creation request is " | |
1685 | "missing parameter '%s'\n", | |
1686 | srp_opt_tokens[i].pattern); | |
1687 | ||
1688 | out: | |
1689 | kfree(options); | |
1690 | return ret; | |
1691 | } | |
1692 | ||
1693 | static ssize_t srp_create_target(struct class_device *class_dev, | |
1694 | const char *buf, size_t count) | |
1695 | { | |
1696 | struct srp_host *host = | |
1697 | container_of(class_dev, struct srp_host, class_dev); | |
1698 | struct Scsi_Host *target_host; | |
1699 | struct srp_target_port *target; | |
1700 | int ret; | |
1701 | int i; | |
1702 | ||
1703 | target_host = scsi_host_alloc(&srp_template, | |
1704 | sizeof (struct srp_target_port)); | |
1705 | if (!target_host) | |
1706 | return -ENOMEM; | |
1707 | ||
5f068992 RD |
1708 | target_host->max_lun = SRP_MAX_LUN; |
1709 | ||
aef9ec39 RD |
1710 | target = host_to_target(target_host); |
1711 | memset(target, 0, sizeof *target); | |
1712 | ||
0c0450db | 1713 | target->io_class = SRP_REV16A_IB_IO_CLASS; |
aef9ec39 RD |
1714 | target->scsi_host = target_host; |
1715 | target->srp_host = host; | |
1716 | ||
d945e1df | 1717 | INIT_LIST_HEAD(&target->free_reqs); |
aef9ec39 | 1718 | INIT_LIST_HEAD(&target->req_queue); |
d945e1df RD |
1719 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
1720 | target->req_ring[i].index = i; | |
1721 | list_add_tail(&target->req_ring[i].list, &target->free_reqs); | |
1722 | } | |
aef9ec39 RD |
1723 | |
1724 | ret = srp_parse_options(buf, target); | |
1725 | if (ret) | |
1726 | goto err; | |
1727 | ||
f5358a17 | 1728 | ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid); |
aef9ec39 RD |
1729 | |
1730 | printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x " | |
1731 | "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
1732 | (unsigned long long) be64_to_cpu(target->id_ext), | |
1733 | (unsigned long long) be64_to_cpu(target->ioc_guid), | |
1734 | be16_to_cpu(target->path.pkey), | |
1735 | (unsigned long long) be64_to_cpu(target->service_id), | |
1736 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]), | |
1737 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]), | |
1738 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]), | |
1739 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]), | |
1740 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]), | |
1741 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]), | |
1742 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]), | |
1743 | (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14])); | |
1744 | ||
1745 | ret = srp_create_target_ib(target); | |
1746 | if (ret) | |
1747 | goto err; | |
1748 | ||
f5358a17 | 1749 | target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target); |
aef9ec39 RD |
1750 | if (IS_ERR(target->cm_id)) { |
1751 | ret = PTR_ERR(target->cm_id); | |
1752 | goto err_free; | |
1753 | } | |
1754 | ||
1755 | ret = srp_connect_target(target); | |
1756 | if (ret) { | |
1757 | printk(KERN_ERR PFX "Connection failed\n"); | |
1758 | goto err_cm_id; | |
1759 | } | |
1760 | ||
1761 | ret = srp_add_target(host, target); | |
1762 | if (ret) | |
1763 | goto err_disconnect; | |
1764 | ||
1765 | return count; | |
1766 | ||
1767 | err_disconnect: | |
1768 | srp_disconnect_target(target); | |
1769 | ||
1770 | err_cm_id: | |
1771 | ib_destroy_cm_id(target->cm_id); | |
1772 | ||
1773 | err_free: | |
1774 | srp_free_target_ib(target); | |
1775 | ||
1776 | err: | |
1777 | scsi_host_put(target_host); | |
1778 | ||
1779 | return ret; | |
1780 | } | |
1781 | ||
1782 | static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); | |
1783 | ||
1784 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) | |
1785 | { | |
1786 | struct srp_host *host = | |
1787 | container_of(class_dev, struct srp_host, class_dev); | |
1788 | ||
f5358a17 | 1789 | return sprintf(buf, "%s\n", host->dev->dev->name); |
aef9ec39 RD |
1790 | } |
1791 | ||
1792 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
1793 | ||
1794 | static ssize_t show_port(struct class_device *class_dev, char *buf) | |
1795 | { | |
1796 | struct srp_host *host = | |
1797 | container_of(class_dev, struct srp_host, class_dev); | |
1798 | ||
1799 | return sprintf(buf, "%d\n", host->port); | |
1800 | } | |
1801 | ||
1802 | static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); | |
1803 | ||
f5358a17 | 1804 | static struct srp_host *srp_add_port(struct srp_device *device, u8 port) |
aef9ec39 RD |
1805 | { |
1806 | struct srp_host *host; | |
1807 | ||
1808 | host = kzalloc(sizeof *host, GFP_KERNEL); | |
1809 | if (!host) | |
1810 | return NULL; | |
1811 | ||
1812 | INIT_LIST_HEAD(&host->target_list); | |
b3589fd4 | 1813 | spin_lock_init(&host->target_lock); |
aef9ec39 RD |
1814 | init_completion(&host->released); |
1815 | host->dev = device; | |
1816 | host->port = port; | |
1817 | ||
1818 | host->initiator_port_id[7] = port; | |
f5358a17 | 1819 | memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8); |
aef9ec39 RD |
1820 | |
1821 | host->class_dev.class = &srp_class; | |
f5358a17 | 1822 | host->class_dev.dev = device->dev->dma_device; |
aef9ec39 | 1823 | snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d", |
f5358a17 | 1824 | device->dev->name, port); |
aef9ec39 RD |
1825 | |
1826 | if (class_device_register(&host->class_dev)) | |
f5358a17 | 1827 | goto free_host; |
aef9ec39 RD |
1828 | if (class_device_create_file(&host->class_dev, &class_device_attr_add_target)) |
1829 | goto err_class; | |
1830 | if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev)) | |
1831 | goto err_class; | |
1832 | if (class_device_create_file(&host->class_dev, &class_device_attr_port)) | |
1833 | goto err_class; | |
1834 | ||
1835 | return host; | |
1836 | ||
1837 | err_class: | |
1838 | class_device_unregister(&host->class_dev); | |
1839 | ||
f5358a17 | 1840 | free_host: |
aef9ec39 RD |
1841 | kfree(host); |
1842 | ||
1843 | return NULL; | |
1844 | } | |
1845 | ||
1846 | static void srp_add_one(struct ib_device *device) | |
1847 | { | |
f5358a17 RD |
1848 | struct srp_device *srp_dev; |
1849 | struct ib_device_attr *dev_attr; | |
1850 | struct ib_fmr_pool_param fmr_param; | |
aef9ec39 | 1851 | struct srp_host *host; |
aef9ec39 RD |
1852 | int s, e, p; |
1853 | ||
f5358a17 RD |
1854 | dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); |
1855 | if (!dev_attr) | |
cf311cd4 | 1856 | return; |
aef9ec39 | 1857 | |
f5358a17 RD |
1858 | if (ib_query_device(device, dev_attr)) { |
1859 | printk(KERN_WARNING PFX "Query device failed for %s\n", | |
1860 | device->name); | |
1861 | goto free_attr; | |
1862 | } | |
1863 | ||
1864 | srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); | |
1865 | if (!srp_dev) | |
1866 | goto free_attr; | |
1867 | ||
1868 | /* | |
1869 | * Use the smallest page size supported by the HCA, down to a | |
1870 | * minimum of 512 bytes (which is the smallest sector that a | |
1871 | * SCSI command will ever carry). | |
1872 | */ | |
1873 | srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1); | |
1874 | srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift; | |
1875 | srp_dev->fmr_page_mask = ~((unsigned long) srp_dev->fmr_page_size - 1); | |
1876 | ||
1877 | INIT_LIST_HEAD(&srp_dev->dev_list); | |
1878 | ||
1879 | srp_dev->dev = device; | |
1880 | srp_dev->pd = ib_alloc_pd(device); | |
1881 | if (IS_ERR(srp_dev->pd)) | |
1882 | goto free_dev; | |
1883 | ||
1884 | srp_dev->mr = ib_get_dma_mr(srp_dev->pd, | |
1885 | IB_ACCESS_LOCAL_WRITE | | |
1886 | IB_ACCESS_REMOTE_READ | | |
1887 | IB_ACCESS_REMOTE_WRITE); | |
1888 | if (IS_ERR(srp_dev->mr)) | |
1889 | goto err_pd; | |
1890 | ||
1891 | memset(&fmr_param, 0, sizeof fmr_param); | |
1892 | fmr_param.pool_size = SRP_FMR_POOL_SIZE; | |
1893 | fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; | |
1894 | fmr_param.cache = 1; | |
1895 | fmr_param.max_pages_per_fmr = SRP_FMR_SIZE; | |
1896 | fmr_param.page_shift = srp_dev->fmr_page_shift; | |
1897 | fmr_param.access = (IB_ACCESS_LOCAL_WRITE | | |
1898 | IB_ACCESS_REMOTE_WRITE | | |
1899 | IB_ACCESS_REMOTE_READ); | |
1900 | ||
1901 | srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); | |
1902 | if (IS_ERR(srp_dev->fmr_pool)) | |
1903 | srp_dev->fmr_pool = NULL; | |
aef9ec39 | 1904 | |
07ebafba | 1905 | if (device->node_type == RDMA_NODE_IB_SWITCH) { |
aef9ec39 RD |
1906 | s = 0; |
1907 | e = 0; | |
1908 | } else { | |
1909 | s = 1; | |
1910 | e = device->phys_port_cnt; | |
1911 | } | |
1912 | ||
1913 | for (p = s; p <= e; ++p) { | |
f5358a17 | 1914 | host = srp_add_port(srp_dev, p); |
aef9ec39 | 1915 | if (host) |
f5358a17 | 1916 | list_add_tail(&host->list, &srp_dev->dev_list); |
aef9ec39 RD |
1917 | } |
1918 | ||
f5358a17 RD |
1919 | ib_set_client_data(device, &srp_client, srp_dev); |
1920 | ||
1921 | goto free_attr; | |
1922 | ||
1923 | err_pd: | |
1924 | ib_dealloc_pd(srp_dev->pd); | |
1925 | ||
1926 | free_dev: | |
1927 | kfree(srp_dev); | |
1928 | ||
1929 | free_attr: | |
1930 | kfree(dev_attr); | |
aef9ec39 RD |
1931 | } |
1932 | ||
1933 | static void srp_remove_one(struct ib_device *device) | |
1934 | { | |
f5358a17 | 1935 | struct srp_device *srp_dev; |
aef9ec39 RD |
1936 | struct srp_host *host, *tmp_host; |
1937 | LIST_HEAD(target_list); | |
1938 | struct srp_target_port *target, *tmp_target; | |
aef9ec39 | 1939 | |
f5358a17 | 1940 | srp_dev = ib_get_client_data(device, &srp_client); |
aef9ec39 | 1941 | |
f5358a17 | 1942 | list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { |
aef9ec39 RD |
1943 | class_device_unregister(&host->class_dev); |
1944 | /* | |
1945 | * Wait for the sysfs entry to go away, so that no new | |
1946 | * target ports can be created. | |
1947 | */ | |
1948 | wait_for_completion(&host->released); | |
1949 | ||
1950 | /* | |
1951 | * Mark all target ports as removed, so we stop queueing | |
1952 | * commands and don't try to reconnect. | |
1953 | */ | |
b3589fd4 | 1954 | spin_lock(&host->target_lock); |
549c5fc2 | 1955 | list_for_each_entry(target, &host->target_list, list) { |
0c5b3952 IR |
1956 | spin_lock_irq(target->scsi_host->host_lock); |
1957 | target->state = SRP_TARGET_REMOVED; | |
1958 | spin_unlock_irq(target->scsi_host->host_lock); | |
aef9ec39 | 1959 | } |
b3589fd4 | 1960 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
1961 | |
1962 | /* | |
1963 | * Wait for any reconnection tasks that may have | |
1964 | * started before we marked our target ports as | |
1965 | * removed, and any target port removal tasks. | |
1966 | */ | |
1967 | flush_scheduled_work(); | |
1968 | ||
1969 | list_for_each_entry_safe(target, tmp_target, | |
1970 | &host->target_list, list) { | |
1971 | scsi_remove_host(target->scsi_host); | |
1972 | srp_disconnect_target(target); | |
1973 | ib_destroy_cm_id(target->cm_id); | |
1974 | srp_free_target_ib(target); | |
1975 | scsi_host_put(target->scsi_host); | |
1976 | } | |
1977 | ||
aef9ec39 RD |
1978 | kfree(host); |
1979 | } | |
1980 | ||
f5358a17 RD |
1981 | if (srp_dev->fmr_pool) |
1982 | ib_destroy_fmr_pool(srp_dev->fmr_pool); | |
1983 | ib_dereg_mr(srp_dev->mr); | |
1984 | ib_dealloc_pd(srp_dev->pd); | |
1985 | ||
1986 | kfree(srp_dev); | |
aef9ec39 RD |
1987 | } |
1988 | ||
1989 | static int __init srp_init_module(void) | |
1990 | { | |
1991 | int ret; | |
1992 | ||
74b0a15b VP |
1993 | srp_template.sg_tablesize = srp_sg_tablesize; |
1994 | srp_max_iu_len = (sizeof (struct srp_cmd) + | |
1995 | sizeof (struct srp_indirect_buf) + | |
1996 | srp_sg_tablesize * 16); | |
1997 | ||
aef9ec39 RD |
1998 | ret = class_register(&srp_class); |
1999 | if (ret) { | |
2000 | printk(KERN_ERR PFX "couldn't register class infiniband_srp\n"); | |
2001 | return ret; | |
2002 | } | |
2003 | ||
c1a0b23b MT |
2004 | ib_sa_register_client(&srp_sa_client); |
2005 | ||
aef9ec39 RD |
2006 | ret = ib_register_client(&srp_client); |
2007 | if (ret) { | |
2008 | printk(KERN_ERR PFX "couldn't register IB client\n"); | |
c1a0b23b | 2009 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 RD |
2010 | class_unregister(&srp_class); |
2011 | return ret; | |
2012 | } | |
2013 | ||
2014 | return 0; | |
2015 | } | |
2016 | ||
2017 | static void __exit srp_cleanup_module(void) | |
2018 | { | |
2019 | ib_unregister_client(&srp_client); | |
c1a0b23b | 2020 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 RD |
2021 | class_unregister(&srp_class); |
2022 | } | |
2023 | ||
2024 | module_init(srp_init_module); | |
2025 | module_exit(srp_cleanup_module); |