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aef9ec39 RD |
1 | /* |
2 | * Copyright (c) 2005 Cisco Systems. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
aef9ec39 RD |
31 | */ |
32 | ||
aef9ec39 RD |
33 | #include <linux/module.h> |
34 | #include <linux/init.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/err.h> | |
37 | #include <linux/string.h> | |
38 | #include <linux/parser.h> | |
39 | #include <linux/random.h> | |
de25968c | 40 | #include <linux/jiffies.h> |
aef9ec39 RD |
41 | |
42 | #include <asm/atomic.h> | |
43 | ||
44 | #include <scsi/scsi.h> | |
45 | #include <scsi/scsi_device.h> | |
46 | #include <scsi/scsi_dbg.h> | |
47 | #include <scsi/srp.h> | |
3236822b | 48 | #include <scsi/scsi_transport_srp.h> |
aef9ec39 | 49 | |
aef9ec39 RD |
50 | #include "ib_srp.h" |
51 | ||
52 | #define DRV_NAME "ib_srp" | |
53 | #define PFX DRV_NAME ": " | |
54 | #define DRV_VERSION "0.2" | |
55 | #define DRV_RELDATE "November 1, 2005" | |
56 | ||
57 | MODULE_AUTHOR("Roland Dreier"); | |
58 | MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator " | |
59 | "v" DRV_VERSION " (" DRV_RELDATE ")"); | |
60 | MODULE_LICENSE("Dual BSD/GPL"); | |
61 | ||
74b0a15b VP |
62 | static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE; |
63 | static int srp_max_iu_len; | |
64 | ||
65 | module_param(srp_sg_tablesize, int, 0444); | |
66 | MODULE_PARM_DESC(srp_sg_tablesize, | |
1e89a194 | 67 | "Max number of gather/scatter entries per I/O (default is 12, max 255)"); |
74b0a15b | 68 | |
aef9ec39 RD |
69 | static int topspin_workarounds = 1; |
70 | ||
71 | module_param(topspin_workarounds, int, 0444); | |
72 | MODULE_PARM_DESC(topspin_workarounds, | |
73 | "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); | |
74 | ||
aef9ec39 RD |
75 | static void srp_add_one(struct ib_device *device); |
76 | static void srp_remove_one(struct ib_device *device); | |
9c03dc9f BVA |
77 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr); |
78 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr); | |
aef9ec39 RD |
79 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); |
80 | ||
3236822b FT |
81 | static struct scsi_transport_template *ib_srp_transport_template; |
82 | ||
aef9ec39 RD |
83 | static struct ib_client srp_client = { |
84 | .name = "srp", | |
85 | .add = srp_add_one, | |
86 | .remove = srp_remove_one | |
87 | }; | |
88 | ||
c1a0b23b MT |
89 | static struct ib_sa_client srp_sa_client; |
90 | ||
aef9ec39 RD |
91 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) |
92 | { | |
93 | return (struct srp_target_port *) host->hostdata; | |
94 | } | |
95 | ||
96 | static const char *srp_target_info(struct Scsi_Host *host) | |
97 | { | |
98 | return host_to_target(host)->target_name; | |
99 | } | |
100 | ||
5d7cbfd6 RD |
101 | static int srp_target_is_topspin(struct srp_target_port *target) |
102 | { | |
103 | static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; | |
3d1ff48d | 104 | static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d }; |
5d7cbfd6 RD |
105 | |
106 | return topspin_workarounds && | |
3d1ff48d RK |
107 | (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) || |
108 | !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui)); | |
5d7cbfd6 RD |
109 | } |
110 | ||
aef9ec39 RD |
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 | ||
05321937 GKH |
125 | iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size, |
126 | direction); | |
127 | if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma)) | |
aef9ec39 RD |
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 | ||
05321937 GKH |
148 | ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size, |
149 | 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 | ||
969a60f9 RD |
169 | ret = ib_find_pkey(target->srp_host->srp_dev->dev, |
170 | target->srp_host->port, | |
171 | be16_to_cpu(target->path.pkey), | |
172 | &attr->pkey_index); | |
aef9ec39 RD |
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 | ||
9fe4bcf4 DD |
192 | static int srp_new_cm_id(struct srp_target_port *target) |
193 | { | |
194 | struct ib_cm_id *new_cm_id; | |
195 | ||
05321937 | 196 | new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev, |
9fe4bcf4 DD |
197 | srp_cm_handler, target); |
198 | if (IS_ERR(new_cm_id)) | |
199 | return PTR_ERR(new_cm_id); | |
200 | ||
201 | if (target->cm_id) | |
202 | ib_destroy_cm_id(target->cm_id); | |
203 | target->cm_id = new_cm_id; | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
aef9ec39 RD |
208 | static int srp_create_target_ib(struct srp_target_port *target) |
209 | { | |
210 | struct ib_qp_init_attr *init_attr; | |
211 | int ret; | |
212 | ||
213 | init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); | |
214 | if (!init_attr) | |
215 | return -ENOMEM; | |
216 | ||
9c03dc9f BVA |
217 | target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev, |
218 | srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0); | |
219 | if (IS_ERR(target->recv_cq)) { | |
220 | ret = PTR_ERR(target->recv_cq); | |
da9d2f07 | 221 | goto err; |
aef9ec39 RD |
222 | } |
223 | ||
9c03dc9f BVA |
224 | target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev, |
225 | srp_send_completion, NULL, target, SRP_SQ_SIZE, 0); | |
226 | if (IS_ERR(target->send_cq)) { | |
227 | ret = PTR_ERR(target->send_cq); | |
da9d2f07 | 228 | goto err_recv_cq; |
9c03dc9f BVA |
229 | } |
230 | ||
231 | ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP); | |
aef9ec39 RD |
232 | |
233 | init_attr->event_handler = srp_qp_event; | |
234 | init_attr->cap.max_send_wr = SRP_SQ_SIZE; | |
235 | init_attr->cap.max_recv_wr = SRP_RQ_SIZE; | |
236 | init_attr->cap.max_recv_sge = 1; | |
237 | init_attr->cap.max_send_sge = 1; | |
238 | init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; | |
239 | init_attr->qp_type = IB_QPT_RC; | |
9c03dc9f BVA |
240 | init_attr->send_cq = target->send_cq; |
241 | init_attr->recv_cq = target->recv_cq; | |
aef9ec39 | 242 | |
05321937 | 243 | target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr); |
aef9ec39 RD |
244 | if (IS_ERR(target->qp)) { |
245 | ret = PTR_ERR(target->qp); | |
da9d2f07 | 246 | goto err_send_cq; |
aef9ec39 RD |
247 | } |
248 | ||
249 | ret = srp_init_qp(target, target->qp); | |
da9d2f07 RD |
250 | if (ret) |
251 | goto err_qp; | |
aef9ec39 | 252 | |
da9d2f07 RD |
253 | kfree(init_attr); |
254 | return 0; | |
255 | ||
256 | err_qp: | |
257 | ib_destroy_qp(target->qp); | |
258 | ||
259 | err_send_cq: | |
260 | ib_destroy_cq(target->send_cq); | |
261 | ||
262 | err_recv_cq: | |
263 | ib_destroy_cq(target->recv_cq); | |
264 | ||
265 | err: | |
aef9ec39 RD |
266 | kfree(init_attr); |
267 | return ret; | |
268 | } | |
269 | ||
270 | static void srp_free_target_ib(struct srp_target_port *target) | |
271 | { | |
272 | int i; | |
273 | ||
274 | ib_destroy_qp(target->qp); | |
9c03dc9f BVA |
275 | ib_destroy_cq(target->send_cq); |
276 | ib_destroy_cq(target->recv_cq); | |
aef9ec39 RD |
277 | |
278 | for (i = 0; i < SRP_RQ_SIZE; ++i) | |
279 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
dd5e6e38 | 280 | for (i = 0; i < SRP_SQ_SIZE; ++i) |
aef9ec39 RD |
281 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
282 | } | |
283 | ||
284 | static void srp_path_rec_completion(int status, | |
285 | struct ib_sa_path_rec *pathrec, | |
286 | void *target_ptr) | |
287 | { | |
288 | struct srp_target_port *target = target_ptr; | |
289 | ||
290 | target->status = status; | |
291 | if (status) | |
7aa54bd7 DD |
292 | shost_printk(KERN_ERR, target->scsi_host, |
293 | PFX "Got failed path rec status %d\n", status); | |
aef9ec39 RD |
294 | else |
295 | target->path = *pathrec; | |
296 | complete(&target->done); | |
297 | } | |
298 | ||
299 | static int srp_lookup_path(struct srp_target_port *target) | |
300 | { | |
301 | target->path.numb_path = 1; | |
302 | ||
303 | init_completion(&target->done); | |
304 | ||
c1a0b23b | 305 | target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, |
05321937 | 306 | target->srp_host->srp_dev->dev, |
aef9ec39 RD |
307 | target->srp_host->port, |
308 | &target->path, | |
247e020e | 309 | IB_SA_PATH_REC_SERVICE_ID | |
aef9ec39 RD |
310 | IB_SA_PATH_REC_DGID | |
311 | IB_SA_PATH_REC_SGID | | |
312 | IB_SA_PATH_REC_NUMB_PATH | | |
313 | IB_SA_PATH_REC_PKEY, | |
314 | SRP_PATH_REC_TIMEOUT_MS, | |
315 | GFP_KERNEL, | |
316 | srp_path_rec_completion, | |
317 | target, &target->path_query); | |
318 | if (target->path_query_id < 0) | |
319 | return target->path_query_id; | |
320 | ||
321 | wait_for_completion(&target->done); | |
322 | ||
323 | if (target->status < 0) | |
7aa54bd7 DD |
324 | shost_printk(KERN_WARNING, target->scsi_host, |
325 | PFX "Path record query failed\n"); | |
aef9ec39 RD |
326 | |
327 | return target->status; | |
328 | } | |
329 | ||
330 | static int srp_send_req(struct srp_target_port *target) | |
331 | { | |
332 | struct { | |
333 | struct ib_cm_req_param param; | |
334 | struct srp_login_req priv; | |
335 | } *req = NULL; | |
336 | int status; | |
337 | ||
338 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
339 | if (!req) | |
340 | return -ENOMEM; | |
341 | ||
342 | req->param.primary_path = &target->path; | |
343 | req->param.alternate_path = NULL; | |
344 | req->param.service_id = target->service_id; | |
345 | req->param.qp_num = target->qp->qp_num; | |
346 | req->param.qp_type = target->qp->qp_type; | |
347 | req->param.private_data = &req->priv; | |
348 | req->param.private_data_len = sizeof req->priv; | |
349 | req->param.flow_control = 1; | |
350 | ||
351 | get_random_bytes(&req->param.starting_psn, 4); | |
352 | req->param.starting_psn &= 0xffffff; | |
353 | ||
354 | /* | |
355 | * Pick some arbitrary defaults here; we could make these | |
356 | * module parameters if anyone cared about setting them. | |
357 | */ | |
358 | req->param.responder_resources = 4; | |
359 | req->param.remote_cm_response_timeout = 20; | |
360 | req->param.local_cm_response_timeout = 20; | |
361 | req->param.retry_count = 7; | |
362 | req->param.rnr_retry_count = 7; | |
363 | req->param.max_cm_retries = 15; | |
364 | ||
365 | req->priv.opcode = SRP_LOGIN_REQ; | |
366 | req->priv.tag = 0; | |
74b0a15b | 367 | req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len); |
aef9ec39 RD |
368 | req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
369 | SRP_BUF_FORMAT_INDIRECT); | |
0c0450db | 370 | /* |
3cd96564 | 371 | * In the published SRP specification (draft rev. 16a), the |
0c0450db R |
372 | * port identifier format is 8 bytes of ID extension followed |
373 | * by 8 bytes of GUID. Older drafts put the two halves in the | |
374 | * opposite order, so that the GUID comes first. | |
375 | * | |
376 | * Targets conforming to these obsolete drafts can be | |
377 | * recognized by the I/O Class they report. | |
378 | */ | |
379 | if (target->io_class == SRP_REV10_IB_IO_CLASS) { | |
380 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb | 381 | &target->path.sgid.global.interface_id, 8); |
0c0450db | 382 | memcpy(req->priv.initiator_port_id + 8, |
01cb9bcb | 383 | &target->initiator_ext, 8); |
0c0450db R |
384 | memcpy(req->priv.target_port_id, &target->ioc_guid, 8); |
385 | memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); | |
386 | } else { | |
387 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb IR |
388 | &target->initiator_ext, 8); |
389 | memcpy(req->priv.initiator_port_id + 8, | |
390 | &target->path.sgid.global.interface_id, 8); | |
0c0450db R |
391 | memcpy(req->priv.target_port_id, &target->id_ext, 8); |
392 | memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); | |
393 | } | |
394 | ||
aef9ec39 RD |
395 | /* |
396 | * Topspin/Cisco SRP targets will reject our login unless we | |
01cb9bcb IR |
397 | * zero out the first 8 bytes of our initiator port ID and set |
398 | * the second 8 bytes to the local node GUID. | |
aef9ec39 | 399 | */ |
5d7cbfd6 | 400 | if (srp_target_is_topspin(target)) { |
7aa54bd7 DD |
401 | shost_printk(KERN_DEBUG, target->scsi_host, |
402 | PFX "Topspin/Cisco initiator port ID workaround " | |
403 | "activated for target GUID %016llx\n", | |
404 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
aef9ec39 | 405 | memset(req->priv.initiator_port_id, 0, 8); |
01cb9bcb | 406 | memcpy(req->priv.initiator_port_id + 8, |
05321937 | 407 | &target->srp_host->srp_dev->dev->node_guid, 8); |
aef9ec39 | 408 | } |
aef9ec39 RD |
409 | |
410 | status = ib_send_cm_req(target->cm_id, &req->param); | |
411 | ||
412 | kfree(req); | |
413 | ||
414 | return status; | |
415 | } | |
416 | ||
417 | static void srp_disconnect_target(struct srp_target_port *target) | |
418 | { | |
419 | /* XXX should send SRP_I_LOGOUT request */ | |
420 | ||
421 | init_completion(&target->done); | |
e6581056 | 422 | if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { |
7aa54bd7 DD |
423 | shost_printk(KERN_DEBUG, target->scsi_host, |
424 | PFX "Sending CM DREQ failed\n"); | |
e6581056 RD |
425 | return; |
426 | } | |
aef9ec39 RD |
427 | wait_for_completion(&target->done); |
428 | } | |
429 | ||
9709f0e0 BVA |
430 | static bool srp_change_state(struct srp_target_port *target, |
431 | enum srp_target_state old, | |
432 | enum srp_target_state new) | |
433 | { | |
434 | bool changed = false; | |
435 | ||
e9684678 | 436 | spin_lock_irq(&target->lock); |
9709f0e0 BVA |
437 | if (target->state == old) { |
438 | target->state = new; | |
439 | changed = true; | |
440 | } | |
e9684678 | 441 | spin_unlock_irq(&target->lock); |
9709f0e0 BVA |
442 | return changed; |
443 | } | |
444 | ||
c4028958 | 445 | static void srp_remove_work(struct work_struct *work) |
aef9ec39 | 446 | { |
c4028958 DH |
447 | struct srp_target_port *target = |
448 | container_of(work, struct srp_target_port, work); | |
aef9ec39 | 449 | |
9709f0e0 | 450 | if (!srp_change_state(target, SRP_TARGET_DEAD, SRP_TARGET_REMOVED)) |
aef9ec39 | 451 | return; |
aef9ec39 | 452 | |
b3589fd4 | 453 | spin_lock(&target->srp_host->target_lock); |
aef9ec39 | 454 | list_del(&target->list); |
b3589fd4 | 455 | spin_unlock(&target->srp_host->target_lock); |
aef9ec39 | 456 | |
3236822b | 457 | srp_remove_host(target->scsi_host); |
aef9ec39 RD |
458 | scsi_remove_host(target->scsi_host); |
459 | ib_destroy_cm_id(target->cm_id); | |
460 | srp_free_target_ib(target); | |
461 | scsi_host_put(target->scsi_host); | |
aef9ec39 RD |
462 | } |
463 | ||
464 | static int srp_connect_target(struct srp_target_port *target) | |
465 | { | |
9fe4bcf4 | 466 | int retries = 3; |
aef9ec39 RD |
467 | int ret; |
468 | ||
469 | ret = srp_lookup_path(target); | |
470 | if (ret) | |
471 | return ret; | |
472 | ||
473 | while (1) { | |
474 | init_completion(&target->done); | |
475 | ret = srp_send_req(target); | |
476 | if (ret) | |
477 | return ret; | |
478 | wait_for_completion(&target->done); | |
479 | ||
480 | /* | |
481 | * The CM event handling code will set status to | |
482 | * SRP_PORT_REDIRECT if we get a port redirect REJ | |
483 | * back, or SRP_DLID_REDIRECT if we get a lid/qp | |
484 | * redirect REJ back. | |
485 | */ | |
486 | switch (target->status) { | |
487 | case 0: | |
488 | return 0; | |
489 | ||
490 | case SRP_PORT_REDIRECT: | |
491 | ret = srp_lookup_path(target); | |
492 | if (ret) | |
493 | return ret; | |
494 | break; | |
495 | ||
496 | case SRP_DLID_REDIRECT: | |
497 | break; | |
498 | ||
9fe4bcf4 DD |
499 | case SRP_STALE_CONN: |
500 | /* Our current CM id was stale, and is now in timewait. | |
501 | * Try to reconnect with a new one. | |
502 | */ | |
503 | if (!retries-- || srp_new_cm_id(target)) { | |
504 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
505 | "giving up on stale connection\n"); | |
506 | target->status = -ECONNRESET; | |
507 | return target->status; | |
508 | } | |
509 | ||
510 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
511 | "retrying stale connection\n"); | |
512 | break; | |
513 | ||
aef9ec39 RD |
514 | default: |
515 | return target->status; | |
516 | } | |
517 | } | |
518 | } | |
519 | ||
d945e1df RD |
520 | static void srp_unmap_data(struct scsi_cmnd *scmnd, |
521 | struct srp_target_port *target, | |
522 | struct srp_request *req) | |
523 | { | |
bb350d1d | 524 | if (!scsi_sglist(scmnd) || |
d945e1df RD |
525 | (scmnd->sc_data_direction != DMA_TO_DEVICE && |
526 | scmnd->sc_data_direction != DMA_FROM_DEVICE)) | |
527 | return; | |
528 | ||
f5358a17 RD |
529 | if (req->fmr) { |
530 | ib_fmr_pool_unmap(req->fmr); | |
531 | req->fmr = NULL; | |
532 | } | |
533 | ||
05321937 | 534 | ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd), |
bb350d1d | 535 | scsi_sg_count(scmnd), scmnd->sc_data_direction); |
d945e1df RD |
536 | } |
537 | ||
94a9174c BVA |
538 | static void srp_remove_req(struct srp_target_port *target, |
539 | struct srp_request *req, s32 req_lim_delta) | |
526b4caa | 540 | { |
94a9174c BVA |
541 | unsigned long flags; |
542 | ||
526b4caa | 543 | srp_unmap_data(req->scmnd, target, req); |
e9684678 | 544 | spin_lock_irqsave(&target->lock, flags); |
94a9174c | 545 | target->req_lim += req_lim_delta; |
f8b6e31e | 546 | req->scmnd = NULL; |
536ae14e | 547 | list_add_tail(&req->list, &target->free_reqs); |
e9684678 | 548 | spin_unlock_irqrestore(&target->lock, flags); |
526b4caa IR |
549 | } |
550 | ||
551 | static void srp_reset_req(struct srp_target_port *target, struct srp_request *req) | |
552 | { | |
553 | req->scmnd->result = DID_RESET << 16; | |
554 | req->scmnd->scsi_done(req->scmnd); | |
94a9174c | 555 | srp_remove_req(target, req, 0); |
526b4caa IR |
556 | } |
557 | ||
aef9ec39 RD |
558 | static int srp_reconnect_target(struct srp_target_port *target) |
559 | { | |
aef9ec39 | 560 | struct ib_qp_attr qp_attr; |
aef9ec39 | 561 | struct ib_wc wc; |
dcb4cb85 | 562 | int i, ret; |
aef9ec39 | 563 | |
9709f0e0 | 564 | if (!srp_change_state(target, SRP_TARGET_LIVE, SRP_TARGET_CONNECTING)) |
aef9ec39 | 565 | return -EAGAIN; |
aef9ec39 RD |
566 | |
567 | srp_disconnect_target(target); | |
568 | /* | |
569 | * Now get a new local CM ID so that we avoid confusing the | |
570 | * target in case things are really fouled up. | |
571 | */ | |
9fe4bcf4 DD |
572 | ret = srp_new_cm_id(target); |
573 | if (ret) | |
aef9ec39 | 574 | goto err; |
aef9ec39 RD |
575 | |
576 | qp_attr.qp_state = IB_QPS_RESET; | |
577 | ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE); | |
578 | if (ret) | |
579 | goto err; | |
580 | ||
581 | ret = srp_init_qp(target, target->qp); | |
582 | if (ret) | |
583 | goto err; | |
584 | ||
9c03dc9f BVA |
585 | while (ib_poll_cq(target->recv_cq, 1, &wc) > 0) |
586 | ; /* nothing */ | |
587 | while (ib_poll_cq(target->send_cq, 1, &wc) > 0) | |
aef9ec39 RD |
588 | ; /* nothing */ |
589 | ||
536ae14e BVA |
590 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { |
591 | struct srp_request *req = &target->req_ring[i]; | |
592 | if (req->scmnd) | |
593 | srp_reset_req(target, req); | |
594 | } | |
aef9ec39 | 595 | |
536ae14e | 596 | INIT_LIST_HEAD(&target->free_tx); |
dcb4cb85 | 597 | for (i = 0; i < SRP_SQ_SIZE; ++i) |
536ae14e | 598 | list_add(&target->tx_ring[i]->list, &target->free_tx); |
aef9ec39 | 599 | |
1033ff67 | 600 | target->qp_in_error = 0; |
aef9ec39 RD |
601 | ret = srp_connect_target(target); |
602 | if (ret) | |
603 | goto err; | |
604 | ||
9709f0e0 | 605 | if (!srp_change_state(target, SRP_TARGET_CONNECTING, SRP_TARGET_LIVE)) |
aef9ec39 | 606 | ret = -EAGAIN; |
aef9ec39 RD |
607 | |
608 | return ret; | |
609 | ||
610 | err: | |
7aa54bd7 DD |
611 | shost_printk(KERN_ERR, target->scsi_host, |
612 | PFX "reconnect failed (%d), removing target port.\n", ret); | |
aef9ec39 RD |
613 | |
614 | /* | |
615 | * We couldn't reconnect, so kill our target port off. | |
9709f0e0 BVA |
616 | * However, we have to defer the real removal because we |
617 | * are in the context of the SCSI error handler now, which | |
618 | * will deadlock if we call scsi_remove_host(). | |
619 | * | |
620 | * Schedule our work inside the lock to avoid a race with | |
621 | * the flush_scheduled_work() in srp_remove_one(). | |
aef9ec39 | 622 | */ |
e9684678 | 623 | spin_lock_irq(&target->lock); |
aef9ec39 RD |
624 | if (target->state == SRP_TARGET_CONNECTING) { |
625 | target->state = SRP_TARGET_DEAD; | |
c4028958 | 626 | INIT_WORK(&target->work, srp_remove_work); |
f0626710 | 627 | queue_work(ib_wq, &target->work); |
aef9ec39 | 628 | } |
e9684678 | 629 | spin_unlock_irq(&target->lock); |
aef9ec39 RD |
630 | |
631 | return ret; | |
632 | } | |
633 | ||
559ce8f1 | 634 | static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat, |
f5358a17 RD |
635 | int sg_cnt, struct srp_request *req, |
636 | struct srp_direct_buf *buf) | |
637 | { | |
638 | u64 io_addr = 0; | |
639 | u64 *dma_pages; | |
640 | u32 len; | |
641 | int page_cnt; | |
642 | int i, j; | |
643 | int ret; | |
05321937 | 644 | struct srp_device *dev = target->srp_host->srp_dev; |
85507bcc | 645 | struct ib_device *ibdev = dev->dev; |
bb350d1d | 646 | struct scatterlist *sg; |
f5358a17 RD |
647 | |
648 | if (!dev->fmr_pool) | |
649 | return -ENODEV; | |
650 | ||
8c4037b5 | 651 | if (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask) |
559ce8f1 IR |
652 | return -EINVAL; |
653 | ||
f5358a17 | 654 | len = page_cnt = 0; |
bb350d1d FT |
655 | scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) { |
656 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
85507bcc | 657 | |
bb350d1d | 658 | if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) { |
f5358a17 RD |
659 | if (i > 0) |
660 | return -EINVAL; | |
661 | else | |
662 | ++page_cnt; | |
663 | } | |
bb350d1d | 664 | if ((ib_sg_dma_address(ibdev, sg) + dma_len) & |
f5358a17 RD |
665 | ~dev->fmr_page_mask) { |
666 | if (i < sg_cnt - 1) | |
667 | return -EINVAL; | |
668 | else | |
669 | ++page_cnt; | |
670 | } | |
671 | ||
85507bcc | 672 | len += dma_len; |
f5358a17 RD |
673 | } |
674 | ||
675 | page_cnt += len >> dev->fmr_page_shift; | |
676 | if (page_cnt > SRP_FMR_SIZE) | |
677 | return -ENOMEM; | |
678 | ||
679 | dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC); | |
680 | if (!dma_pages) | |
681 | return -ENOMEM; | |
682 | ||
683 | page_cnt = 0; | |
bb350d1d FT |
684 | scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) { |
685 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
85507bcc RC |
686 | |
687 | for (j = 0; j < dma_len; j += dev->fmr_page_size) | |
f5358a17 | 688 | dma_pages[page_cnt++] = |
bb350d1d | 689 | (ib_sg_dma_address(ibdev, sg) & |
85507bcc RC |
690 | dev->fmr_page_mask) + j; |
691 | } | |
f5358a17 RD |
692 | |
693 | req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool, | |
adfaa888 | 694 | dma_pages, page_cnt, io_addr); |
f5358a17 RD |
695 | if (IS_ERR(req->fmr)) { |
696 | ret = PTR_ERR(req->fmr); | |
6583eb3d | 697 | req->fmr = NULL; |
f5358a17 RD |
698 | goto out; |
699 | } | |
700 | ||
85507bcc RC |
701 | buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) & |
702 | ~dev->fmr_page_mask); | |
f5358a17 RD |
703 | buf->key = cpu_to_be32(req->fmr->fmr->rkey); |
704 | buf->len = cpu_to_be32(len); | |
705 | ||
706 | ret = 0; | |
707 | ||
708 | out: | |
709 | kfree(dma_pages); | |
710 | ||
711 | return ret; | |
712 | } | |
713 | ||
aef9ec39 RD |
714 | static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, |
715 | struct srp_request *req) | |
716 | { | |
cf368713 | 717 | struct scatterlist *scat; |
aef9ec39 | 718 | struct srp_cmd *cmd = req->cmd->buf; |
cf368713 | 719 | int len, nents, count; |
f5358a17 | 720 | u8 fmt = SRP_DATA_DESC_DIRECT; |
85507bcc RC |
721 | struct srp_device *dev; |
722 | struct ib_device *ibdev; | |
aef9ec39 | 723 | |
bb350d1d | 724 | if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE) |
aef9ec39 RD |
725 | return sizeof (struct srp_cmd); |
726 | ||
727 | if (scmnd->sc_data_direction != DMA_FROM_DEVICE && | |
728 | scmnd->sc_data_direction != DMA_TO_DEVICE) { | |
7aa54bd7 DD |
729 | shost_printk(KERN_WARNING, target->scsi_host, |
730 | PFX "Unhandled data direction %d\n", | |
731 | scmnd->sc_data_direction); | |
aef9ec39 RD |
732 | return -EINVAL; |
733 | } | |
734 | ||
bb350d1d FT |
735 | nents = scsi_sg_count(scmnd); |
736 | scat = scsi_sglist(scmnd); | |
aef9ec39 | 737 | |
05321937 | 738 | dev = target->srp_host->srp_dev; |
85507bcc RC |
739 | ibdev = dev->dev; |
740 | ||
741 | count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); | |
f5358a17 RD |
742 | |
743 | fmt = SRP_DATA_DESC_DIRECT; | |
744 | len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); | |
aef9ec39 | 745 | |
cf368713 | 746 | if (count == 1) { |
f5358a17 RD |
747 | /* |
748 | * The midlayer only generated a single gather/scatter | |
749 | * entry, or DMA mapping coalesced everything to a | |
750 | * single entry. So a direct descriptor along with | |
751 | * the DMA MR suffices. | |
752 | */ | |
cf368713 | 753 | struct srp_direct_buf *buf = (void *) cmd->add_data; |
aef9ec39 | 754 | |
85507bcc | 755 | buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); |
9af76271 | 756 | buf->key = cpu_to_be32(target->rkey); |
85507bcc | 757 | buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); |
559ce8f1 | 758 | } else if (srp_map_fmr(target, scat, count, req, |
f5358a17 RD |
759 | (void *) cmd->add_data)) { |
760 | /* | |
761 | * FMR mapping failed, and the scatterlist has more | |
762 | * than one entry. Generate an indirect memory | |
763 | * descriptor. | |
764 | */ | |
cf368713 | 765 | struct srp_indirect_buf *buf = (void *) cmd->add_data; |
bb350d1d | 766 | struct scatterlist *sg; |
cf368713 | 767 | u32 datalen = 0; |
f5358a17 | 768 | int i; |
aef9ec39 | 769 | |
cf368713 | 770 | fmt = SRP_DATA_DESC_INDIRECT; |
f5358a17 RD |
771 | len = sizeof (struct srp_cmd) + |
772 | sizeof (struct srp_indirect_buf) + | |
773 | count * sizeof (struct srp_direct_buf); | |
774 | ||
bb350d1d FT |
775 | scsi_for_each_sg(scmnd, sg, count, i) { |
776 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
85507bcc | 777 | |
f5358a17 | 778 | buf->desc_list[i].va = |
bb350d1d | 779 | cpu_to_be64(ib_sg_dma_address(ibdev, sg)); |
f5358a17 | 780 | buf->desc_list[i].key = |
9af76271 | 781 | cpu_to_be32(target->rkey); |
85507bcc RC |
782 | buf->desc_list[i].len = cpu_to_be32(dma_len); |
783 | datalen += dma_len; | |
f5358a17 | 784 | } |
aef9ec39 | 785 | |
cf368713 RD |
786 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) |
787 | cmd->data_out_desc_cnt = count; | |
788 | else | |
789 | cmd->data_in_desc_cnt = count; | |
790 | ||
f5358a17 RD |
791 | buf->table_desc.va = |
792 | cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf); | |
cf368713 | 793 | buf->table_desc.key = |
9af76271 | 794 | cpu_to_be32(target->rkey); |
cf368713 RD |
795 | buf->table_desc.len = |
796 | cpu_to_be32(count * sizeof (struct srp_direct_buf)); | |
797 | ||
cf368713 | 798 | buf->len = cpu_to_be32(datalen); |
aef9ec39 RD |
799 | } |
800 | ||
801 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) | |
802 | cmd->buf_fmt = fmt << 4; | |
803 | else | |
804 | cmd->buf_fmt = fmt; | |
805 | ||
aef9ec39 RD |
806 | return len; |
807 | } | |
808 | ||
76c75b25 BVA |
809 | /* |
810 | * Return an IU and possible credit to the free pool | |
811 | */ | |
812 | static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu, | |
813 | enum srp_iu_type iu_type) | |
814 | { | |
815 | unsigned long flags; | |
816 | ||
e9684678 | 817 | spin_lock_irqsave(&target->lock, flags); |
76c75b25 BVA |
818 | list_add(&iu->list, &target->free_tx); |
819 | if (iu_type != SRP_IU_RSP) | |
820 | ++target->req_lim; | |
e9684678 | 821 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 BVA |
822 | } |
823 | ||
05a1d750 | 824 | /* |
e9684678 BVA |
825 | * Must be called with target->lock held to protect req_lim and free_tx. |
826 | * If IU is not sent, it must be returned using srp_put_tx_iu(). | |
05a1d750 DD |
827 | * |
828 | * Note: | |
829 | * An upper limit for the number of allocated information units for each | |
830 | * request type is: | |
831 | * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues | |
832 | * more than Scsi_Host.can_queue requests. | |
833 | * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE. | |
834 | * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than | |
835 | * one unanswered SRP request to an initiator. | |
836 | */ | |
837 | static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target, | |
838 | enum srp_iu_type iu_type) | |
839 | { | |
840 | s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE; | |
841 | struct srp_iu *iu; | |
842 | ||
843 | srp_send_completion(target->send_cq, target); | |
844 | ||
dcb4cb85 | 845 | if (list_empty(&target->free_tx)) |
05a1d750 DD |
846 | return NULL; |
847 | ||
848 | /* Initiator responses to target requests do not consume credits */ | |
76c75b25 BVA |
849 | if (iu_type != SRP_IU_RSP) { |
850 | if (target->req_lim <= rsv) { | |
851 | ++target->zero_req_lim; | |
852 | return NULL; | |
853 | } | |
854 | ||
855 | --target->req_lim; | |
05a1d750 DD |
856 | } |
857 | ||
dcb4cb85 | 858 | iu = list_first_entry(&target->free_tx, struct srp_iu, list); |
76c75b25 | 859 | list_del(&iu->list); |
05a1d750 DD |
860 | return iu; |
861 | } | |
862 | ||
76c75b25 BVA |
863 | static int srp_post_send(struct srp_target_port *target, |
864 | struct srp_iu *iu, int len) | |
05a1d750 DD |
865 | { |
866 | struct ib_sge list; | |
867 | struct ib_send_wr wr, *bad_wr; | |
05a1d750 DD |
868 | |
869 | list.addr = iu->dma; | |
870 | list.length = len; | |
9af76271 | 871 | list.lkey = target->lkey; |
05a1d750 DD |
872 | |
873 | wr.next = NULL; | |
dcb4cb85 | 874 | wr.wr_id = (uintptr_t) iu; |
05a1d750 DD |
875 | wr.sg_list = &list; |
876 | wr.num_sge = 1; | |
877 | wr.opcode = IB_WR_SEND; | |
878 | wr.send_flags = IB_SEND_SIGNALED; | |
879 | ||
76c75b25 | 880 | return ib_post_send(target->qp, &wr, &bad_wr); |
05a1d750 DD |
881 | } |
882 | ||
dcb4cb85 | 883 | static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu) |
c996bb47 | 884 | { |
c996bb47 | 885 | struct ib_recv_wr wr, *bad_wr; |
dcb4cb85 | 886 | struct ib_sge list; |
c996bb47 BVA |
887 | |
888 | list.addr = iu->dma; | |
889 | list.length = iu->size; | |
9af76271 | 890 | list.lkey = target->lkey; |
c996bb47 BVA |
891 | |
892 | wr.next = NULL; | |
dcb4cb85 | 893 | wr.wr_id = (uintptr_t) iu; |
c996bb47 BVA |
894 | wr.sg_list = &list; |
895 | wr.num_sge = 1; | |
896 | ||
dcb4cb85 | 897 | return ib_post_recv(target->qp, &wr, &bad_wr); |
c996bb47 BVA |
898 | } |
899 | ||
aef9ec39 RD |
900 | static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) |
901 | { | |
902 | struct srp_request *req; | |
903 | struct scsi_cmnd *scmnd; | |
904 | unsigned long flags; | |
aef9ec39 | 905 | |
aef9ec39 | 906 | if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { |
e9684678 | 907 | spin_lock_irqsave(&target->lock, flags); |
94a9174c | 908 | target->req_lim += be32_to_cpu(rsp->req_lim_delta); |
e9684678 | 909 | spin_unlock_irqrestore(&target->lock, flags); |
94a9174c | 910 | |
f8b6e31e DD |
911 | target->tsk_mgmt_status = -1; |
912 | if (be32_to_cpu(rsp->resp_data_len) >= 4) | |
913 | target->tsk_mgmt_status = rsp->data[3]; | |
914 | complete(&target->tsk_mgmt_done); | |
aef9ec39 | 915 | } else { |
f8b6e31e | 916 | req = &target->req_ring[rsp->tag]; |
d945e1df | 917 | scmnd = req->scmnd; |
aef9ec39 | 918 | if (!scmnd) |
7aa54bd7 DD |
919 | shost_printk(KERN_ERR, target->scsi_host, |
920 | "Null scmnd for RSP w/tag %016llx\n", | |
921 | (unsigned long long) rsp->tag); | |
aef9ec39 RD |
922 | scmnd->result = rsp->status; |
923 | ||
924 | if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { | |
925 | memcpy(scmnd->sense_buffer, rsp->data + | |
926 | be32_to_cpu(rsp->resp_data_len), | |
927 | min_t(int, be32_to_cpu(rsp->sense_data_len), | |
928 | SCSI_SENSE_BUFFERSIZE)); | |
929 | } | |
930 | ||
931 | if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) | |
bb350d1d | 932 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); |
aef9ec39 | 933 | else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) |
bb350d1d | 934 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
aef9ec39 | 935 | |
94a9174c | 936 | srp_remove_req(target, req, be32_to_cpu(rsp->req_lim_delta)); |
f8b6e31e DD |
937 | scmnd->host_scribble = NULL; |
938 | scmnd->scsi_done(scmnd); | |
aef9ec39 | 939 | } |
aef9ec39 RD |
940 | } |
941 | ||
bb12588a DD |
942 | static int srp_response_common(struct srp_target_port *target, s32 req_delta, |
943 | void *rsp, int len) | |
944 | { | |
76c75b25 | 945 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
bb12588a DD |
946 | unsigned long flags; |
947 | struct srp_iu *iu; | |
76c75b25 | 948 | int err; |
bb12588a | 949 | |
e9684678 | 950 | spin_lock_irqsave(&target->lock, flags); |
bb12588a | 951 | target->req_lim += req_delta; |
bb12588a | 952 | iu = __srp_get_tx_iu(target, SRP_IU_RSP); |
e9684678 | 953 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 | 954 | |
bb12588a DD |
955 | if (!iu) { |
956 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
957 | "no IU available to send response\n"); | |
76c75b25 | 958 | return 1; |
bb12588a DD |
959 | } |
960 | ||
961 | ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE); | |
962 | memcpy(iu->buf, rsp, len); | |
963 | ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE); | |
964 | ||
76c75b25 BVA |
965 | err = srp_post_send(target, iu, len); |
966 | if (err) { | |
bb12588a DD |
967 | shost_printk(KERN_ERR, target->scsi_host, PFX |
968 | "unable to post response: %d\n", err); | |
76c75b25 BVA |
969 | srp_put_tx_iu(target, iu, SRP_IU_RSP); |
970 | } | |
bb12588a | 971 | |
bb12588a DD |
972 | return err; |
973 | } | |
974 | ||
975 | static void srp_process_cred_req(struct srp_target_port *target, | |
976 | struct srp_cred_req *req) | |
977 | { | |
978 | struct srp_cred_rsp rsp = { | |
979 | .opcode = SRP_CRED_RSP, | |
980 | .tag = req->tag, | |
981 | }; | |
982 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
983 | ||
984 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
985 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
986 | "problems processing SRP_CRED_REQ\n"); | |
987 | } | |
988 | ||
989 | static void srp_process_aer_req(struct srp_target_port *target, | |
990 | struct srp_aer_req *req) | |
991 | { | |
992 | struct srp_aer_rsp rsp = { | |
993 | .opcode = SRP_AER_RSP, | |
994 | .tag = req->tag, | |
995 | }; | |
996 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
997 | ||
998 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
999 | "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun)); | |
1000 | ||
1001 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1002 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1003 | "problems processing SRP_AER_REQ\n"); | |
1004 | } | |
1005 | ||
aef9ec39 RD |
1006 | static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) |
1007 | { | |
dcb4cb85 BVA |
1008 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
1009 | struct srp_iu *iu = (struct srp_iu *) wc->wr_id; | |
c996bb47 | 1010 | int res; |
aef9ec39 RD |
1011 | u8 opcode; |
1012 | ||
85507bcc RC |
1013 | ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, |
1014 | DMA_FROM_DEVICE); | |
aef9ec39 RD |
1015 | |
1016 | opcode = *(u8 *) iu->buf; | |
1017 | ||
1018 | if (0) { | |
7aa54bd7 DD |
1019 | shost_printk(KERN_ERR, target->scsi_host, |
1020 | PFX "recv completion, opcode 0x%02x\n", opcode); | |
7a700811 BVA |
1021 | print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1, |
1022 | iu->buf, wc->byte_len, true); | |
aef9ec39 RD |
1023 | } |
1024 | ||
1025 | switch (opcode) { | |
1026 | case SRP_RSP: | |
1027 | srp_process_rsp(target, iu->buf); | |
1028 | break; | |
1029 | ||
bb12588a DD |
1030 | case SRP_CRED_REQ: |
1031 | srp_process_cred_req(target, iu->buf); | |
1032 | break; | |
1033 | ||
1034 | case SRP_AER_REQ: | |
1035 | srp_process_aer_req(target, iu->buf); | |
1036 | break; | |
1037 | ||
aef9ec39 RD |
1038 | case SRP_T_LOGOUT: |
1039 | /* XXX Handle target logout */ | |
7aa54bd7 DD |
1040 | shost_printk(KERN_WARNING, target->scsi_host, |
1041 | PFX "Got target logout request\n"); | |
aef9ec39 RD |
1042 | break; |
1043 | ||
1044 | default: | |
7aa54bd7 DD |
1045 | shost_printk(KERN_WARNING, target->scsi_host, |
1046 | PFX "Unhandled SRP opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1047 | break; |
1048 | } | |
1049 | ||
85507bcc RC |
1050 | ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, |
1051 | DMA_FROM_DEVICE); | |
c996bb47 | 1052 | |
dcb4cb85 | 1053 | res = srp_post_recv(target, iu); |
c996bb47 BVA |
1054 | if (res != 0) |
1055 | shost_printk(KERN_ERR, target->scsi_host, | |
1056 | PFX "Recv failed with error code %d\n", res); | |
aef9ec39 RD |
1057 | } |
1058 | ||
9c03dc9f | 1059 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr) |
aef9ec39 RD |
1060 | { |
1061 | struct srp_target_port *target = target_ptr; | |
1062 | struct ib_wc wc; | |
aef9ec39 RD |
1063 | |
1064 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
1065 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
1066 | if (wc.status) { | |
7aa54bd7 | 1067 | shost_printk(KERN_ERR, target->scsi_host, |
9c03dc9f | 1068 | PFX "failed receive status %d\n", |
7aa54bd7 | 1069 | wc.status); |
1033ff67 | 1070 | target->qp_in_error = 1; |
aef9ec39 RD |
1071 | break; |
1072 | } | |
1073 | ||
9c03dc9f BVA |
1074 | srp_handle_recv(target, &wc); |
1075 | } | |
1076 | } | |
1077 | ||
1078 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr) | |
1079 | { | |
1080 | struct srp_target_port *target = target_ptr; | |
1081 | struct ib_wc wc; | |
dcb4cb85 | 1082 | struct srp_iu *iu; |
9c03dc9f BVA |
1083 | |
1084 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
1085 | if (wc.status) { | |
1086 | shost_printk(KERN_ERR, target->scsi_host, | |
1087 | PFX "failed send status %d\n", | |
1088 | wc.status); | |
1089 | target->qp_in_error = 1; | |
1090 | break; | |
1091 | } | |
1092 | ||
dcb4cb85 BVA |
1093 | iu = (struct srp_iu *) wc.wr_id; |
1094 | list_add(&iu->list, &target->free_tx); | |
aef9ec39 RD |
1095 | } |
1096 | } | |
1097 | ||
76c75b25 | 1098 | static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd) |
aef9ec39 | 1099 | { |
76c75b25 | 1100 | struct srp_target_port *target = host_to_target(shost); |
aef9ec39 RD |
1101 | struct srp_request *req; |
1102 | struct srp_iu *iu; | |
1103 | struct srp_cmd *cmd; | |
85507bcc | 1104 | struct ib_device *dev; |
76c75b25 | 1105 | unsigned long flags; |
aef9ec39 RD |
1106 | int len; |
1107 | ||
1108 | if (target->state == SRP_TARGET_CONNECTING) | |
1109 | goto err; | |
1110 | ||
1111 | if (target->state == SRP_TARGET_DEAD || | |
1112 | target->state == SRP_TARGET_REMOVED) { | |
1113 | scmnd->result = DID_BAD_TARGET << 16; | |
76c75b25 | 1114 | scmnd->scsi_done(scmnd); |
aef9ec39 RD |
1115 | return 0; |
1116 | } | |
1117 | ||
e9684678 | 1118 | spin_lock_irqsave(&target->lock, flags); |
bb12588a | 1119 | iu = __srp_get_tx_iu(target, SRP_IU_CMD); |
aef9ec39 | 1120 | if (!iu) |
695b8349 BVA |
1121 | goto err_unlock; |
1122 | ||
1123 | req = list_first_entry(&target->free_reqs, struct srp_request, list); | |
1124 | list_del(&req->list); | |
1125 | spin_unlock_irqrestore(&target->lock, flags); | |
aef9ec39 | 1126 | |
05321937 | 1127 | dev = target->srp_host->srp_dev->dev; |
85507bcc RC |
1128 | ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len, |
1129 | DMA_TO_DEVICE); | |
aef9ec39 | 1130 | |
aef9ec39 | 1131 | scmnd->result = 0; |
f8b6e31e | 1132 | scmnd->host_scribble = (void *) req; |
aef9ec39 RD |
1133 | |
1134 | cmd = iu->buf; | |
1135 | memset(cmd, 0, sizeof *cmd); | |
1136 | ||
1137 | cmd->opcode = SRP_CMD; | |
1138 | cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); | |
d945e1df | 1139 | cmd->tag = req->index; |
aef9ec39 RD |
1140 | memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); |
1141 | ||
aef9ec39 RD |
1142 | req->scmnd = scmnd; |
1143 | req->cmd = iu; | |
aef9ec39 RD |
1144 | |
1145 | len = srp_map_data(scmnd, target, req); | |
1146 | if (len < 0) { | |
7aa54bd7 DD |
1147 | shost_printk(KERN_ERR, target->scsi_host, |
1148 | PFX "Failed to map data\n"); | |
76c75b25 | 1149 | goto err_iu; |
aef9ec39 RD |
1150 | } |
1151 | ||
85507bcc RC |
1152 | ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len, |
1153 | DMA_TO_DEVICE); | |
aef9ec39 | 1154 | |
76c75b25 | 1155 | if (srp_post_send(target, iu, len)) { |
7aa54bd7 | 1156 | shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n"); |
aef9ec39 RD |
1157 | goto err_unmap; |
1158 | } | |
1159 | ||
aef9ec39 RD |
1160 | return 0; |
1161 | ||
1162 | err_unmap: | |
1163 | srp_unmap_data(scmnd, target, req); | |
1164 | ||
76c75b25 BVA |
1165 | err_iu: |
1166 | srp_put_tx_iu(target, iu, SRP_IU_CMD); | |
1167 | ||
e9684678 | 1168 | spin_lock_irqsave(&target->lock, flags); |
76c75b25 | 1169 | list_add(&req->list, &target->free_reqs); |
695b8349 BVA |
1170 | |
1171 | err_unlock: | |
e9684678 | 1172 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 | 1173 | |
aef9ec39 RD |
1174 | err: |
1175 | return SCSI_MLQUEUE_HOST_BUSY; | |
1176 | } | |
1177 | ||
1178 | static int srp_alloc_iu_bufs(struct srp_target_port *target) | |
1179 | { | |
1180 | int i; | |
1181 | ||
1182 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1183 | target->rx_ring[i] = srp_alloc_iu(target->srp_host, | |
1184 | target->max_ti_iu_len, | |
1185 | GFP_KERNEL, DMA_FROM_DEVICE); | |
1186 | if (!target->rx_ring[i]) | |
1187 | goto err; | |
1188 | } | |
1189 | ||
dd5e6e38 | 1190 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
aef9ec39 | 1191 | target->tx_ring[i] = srp_alloc_iu(target->srp_host, |
74b0a15b | 1192 | srp_max_iu_len, |
aef9ec39 RD |
1193 | GFP_KERNEL, DMA_TO_DEVICE); |
1194 | if (!target->tx_ring[i]) | |
1195 | goto err; | |
dcb4cb85 BVA |
1196 | |
1197 | list_add(&target->tx_ring[i]->list, &target->free_tx); | |
aef9ec39 RD |
1198 | } |
1199 | ||
1200 | return 0; | |
1201 | ||
1202 | err: | |
1203 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1204 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
1205 | target->rx_ring[i] = NULL; | |
1206 | } | |
1207 | ||
dd5e6e38 | 1208 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
aef9ec39 RD |
1209 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
1210 | target->tx_ring[i] = NULL; | |
1211 | } | |
1212 | ||
1213 | return -ENOMEM; | |
1214 | } | |
1215 | ||
1216 | static void srp_cm_rej_handler(struct ib_cm_id *cm_id, | |
1217 | struct ib_cm_event *event, | |
1218 | struct srp_target_port *target) | |
1219 | { | |
7aa54bd7 | 1220 | struct Scsi_Host *shost = target->scsi_host; |
aef9ec39 RD |
1221 | struct ib_class_port_info *cpi; |
1222 | int opcode; | |
1223 | ||
1224 | switch (event->param.rej_rcvd.reason) { | |
1225 | case IB_CM_REJ_PORT_CM_REDIRECT: | |
1226 | cpi = event->param.rej_rcvd.ari; | |
1227 | target->path.dlid = cpi->redirect_lid; | |
1228 | target->path.pkey = cpi->redirect_pkey; | |
1229 | cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; | |
1230 | memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); | |
1231 | ||
1232 | target->status = target->path.dlid ? | |
1233 | SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; | |
1234 | break; | |
1235 | ||
1236 | case IB_CM_REJ_PORT_REDIRECT: | |
5d7cbfd6 | 1237 | if (srp_target_is_topspin(target)) { |
aef9ec39 RD |
1238 | /* |
1239 | * Topspin/Cisco SRP gateways incorrectly send | |
1240 | * reject reason code 25 when they mean 24 | |
1241 | * (port redirect). | |
1242 | */ | |
1243 | memcpy(target->path.dgid.raw, | |
1244 | event->param.rej_rcvd.ari, 16); | |
1245 | ||
7aa54bd7 DD |
1246 | shost_printk(KERN_DEBUG, shost, |
1247 | PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", | |
1248 | (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), | |
1249 | (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); | |
aef9ec39 RD |
1250 | |
1251 | target->status = SRP_PORT_REDIRECT; | |
1252 | } else { | |
7aa54bd7 DD |
1253 | shost_printk(KERN_WARNING, shost, |
1254 | " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); | |
aef9ec39 RD |
1255 | target->status = -ECONNRESET; |
1256 | } | |
1257 | break; | |
1258 | ||
1259 | case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: | |
7aa54bd7 DD |
1260 | shost_printk(KERN_WARNING, shost, |
1261 | " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); | |
aef9ec39 RD |
1262 | target->status = -ECONNRESET; |
1263 | break; | |
1264 | ||
1265 | case IB_CM_REJ_CONSUMER_DEFINED: | |
1266 | opcode = *(u8 *) event->private_data; | |
1267 | if (opcode == SRP_LOGIN_REJ) { | |
1268 | struct srp_login_rej *rej = event->private_data; | |
1269 | u32 reason = be32_to_cpu(rej->reason); | |
1270 | ||
1271 | if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) | |
7aa54bd7 DD |
1272 | shost_printk(KERN_WARNING, shost, |
1273 | PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); | |
aef9ec39 | 1274 | else |
7aa54bd7 DD |
1275 | shost_printk(KERN_WARNING, shost, |
1276 | PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason); | |
aef9ec39 | 1277 | } else |
7aa54bd7 DD |
1278 | shost_printk(KERN_WARNING, shost, |
1279 | " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," | |
1280 | " opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1281 | target->status = -ECONNRESET; |
1282 | break; | |
1283 | ||
9fe4bcf4 DD |
1284 | case IB_CM_REJ_STALE_CONN: |
1285 | shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n"); | |
1286 | target->status = SRP_STALE_CONN; | |
1287 | break; | |
1288 | ||
aef9ec39 | 1289 | default: |
7aa54bd7 DD |
1290 | shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n", |
1291 | event->param.rej_rcvd.reason); | |
aef9ec39 RD |
1292 | target->status = -ECONNRESET; |
1293 | } | |
1294 | } | |
1295 | ||
1296 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
1297 | { | |
1298 | struct srp_target_port *target = cm_id->context; | |
1299 | struct ib_qp_attr *qp_attr = NULL; | |
1300 | int attr_mask = 0; | |
1301 | int comp = 0; | |
1302 | int opcode = 0; | |
c996bb47 | 1303 | int i; |
aef9ec39 RD |
1304 | |
1305 | switch (event->event) { | |
1306 | case IB_CM_REQ_ERROR: | |
7aa54bd7 DD |
1307 | shost_printk(KERN_DEBUG, target->scsi_host, |
1308 | PFX "Sending CM REQ failed\n"); | |
aef9ec39 RD |
1309 | comp = 1; |
1310 | target->status = -ECONNRESET; | |
1311 | break; | |
1312 | ||
1313 | case IB_CM_REP_RECEIVED: | |
1314 | comp = 1; | |
1315 | opcode = *(u8 *) event->private_data; | |
1316 | ||
1317 | if (opcode == SRP_LOGIN_RSP) { | |
1318 | struct srp_login_rsp *rsp = event->private_data; | |
1319 | ||
1320 | target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len); | |
1321 | target->req_lim = be32_to_cpu(rsp->req_lim_delta); | |
1322 | ||
7ade400a BVA |
1323 | /* |
1324 | * Reserve credits for task management so we don't | |
1325 | * bounce requests back to the SCSI mid-layer. | |
1326 | */ | |
1327 | target->scsi_host->can_queue | |
1328 | = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE, | |
1329 | target->scsi_host->can_queue); | |
aef9ec39 | 1330 | } else { |
7aa54bd7 DD |
1331 | shost_printk(KERN_WARNING, target->scsi_host, |
1332 | PFX "Unhandled RSP opcode %#x\n", opcode); | |
aef9ec39 RD |
1333 | target->status = -ECONNRESET; |
1334 | break; | |
1335 | } | |
1336 | ||
d2fcea7d VP |
1337 | if (!target->rx_ring[0]) { |
1338 | target->status = srp_alloc_iu_bufs(target); | |
1339 | if (target->status) | |
1340 | break; | |
1341 | } | |
aef9ec39 RD |
1342 | |
1343 | qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); | |
1344 | if (!qp_attr) { | |
1345 | target->status = -ENOMEM; | |
1346 | break; | |
1347 | } | |
1348 | ||
1349 | qp_attr->qp_state = IB_QPS_RTR; | |
1350 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1351 | if (target->status) | |
1352 | break; | |
1353 | ||
1354 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1355 | if (target->status) | |
1356 | break; | |
1357 | ||
c996bb47 | 1358 | for (i = 0; i < SRP_RQ_SIZE; i++) { |
dcb4cb85 BVA |
1359 | struct srp_iu *iu = target->rx_ring[i]; |
1360 | target->status = srp_post_recv(target, iu); | |
c996bb47 BVA |
1361 | if (target->status) |
1362 | break; | |
1363 | } | |
aef9ec39 RD |
1364 | if (target->status) |
1365 | break; | |
1366 | ||
1367 | qp_attr->qp_state = IB_QPS_RTS; | |
1368 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1369 | if (target->status) | |
1370 | break; | |
1371 | ||
1372 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1373 | if (target->status) | |
1374 | break; | |
1375 | ||
1376 | target->status = ib_send_cm_rtu(cm_id, NULL, 0); | |
1377 | if (target->status) | |
1378 | break; | |
1379 | ||
1380 | break; | |
1381 | ||
1382 | case IB_CM_REJ_RECEIVED: | |
7aa54bd7 | 1383 | shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n"); |
aef9ec39 RD |
1384 | comp = 1; |
1385 | ||
1386 | srp_cm_rej_handler(cm_id, event, target); | |
1387 | break; | |
1388 | ||
b7ac4ab4 | 1389 | case IB_CM_DREQ_RECEIVED: |
7aa54bd7 DD |
1390 | shost_printk(KERN_WARNING, target->scsi_host, |
1391 | PFX "DREQ received - connection closed\n"); | |
b7ac4ab4 | 1392 | if (ib_send_cm_drep(cm_id, NULL, 0)) |
7aa54bd7 DD |
1393 | shost_printk(KERN_ERR, target->scsi_host, |
1394 | PFX "Sending CM DREP failed\n"); | |
aef9ec39 RD |
1395 | break; |
1396 | ||
1397 | case IB_CM_TIMEWAIT_EXIT: | |
7aa54bd7 DD |
1398 | shost_printk(KERN_ERR, target->scsi_host, |
1399 | PFX "connection closed\n"); | |
aef9ec39 RD |
1400 | |
1401 | comp = 1; | |
1402 | target->status = 0; | |
1403 | break; | |
1404 | ||
b7ac4ab4 IR |
1405 | case IB_CM_MRA_RECEIVED: |
1406 | case IB_CM_DREQ_ERROR: | |
1407 | case IB_CM_DREP_RECEIVED: | |
1408 | break; | |
1409 | ||
aef9ec39 | 1410 | default: |
7aa54bd7 DD |
1411 | shost_printk(KERN_WARNING, target->scsi_host, |
1412 | PFX "Unhandled CM event %d\n", event->event); | |
aef9ec39 RD |
1413 | break; |
1414 | } | |
1415 | ||
1416 | if (comp) | |
1417 | complete(&target->done); | |
1418 | ||
1419 | kfree(qp_attr); | |
1420 | ||
1421 | return 0; | |
1422 | } | |
1423 | ||
d945e1df | 1424 | static int srp_send_tsk_mgmt(struct srp_target_port *target, |
f8b6e31e | 1425 | u64 req_tag, unsigned int lun, u8 func) |
aef9ec39 | 1426 | { |
19081f31 | 1427 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
aef9ec39 RD |
1428 | struct srp_iu *iu; |
1429 | struct srp_tsk_mgmt *tsk_mgmt; | |
aef9ec39 | 1430 | |
1285b3a0 | 1431 | if (target->state == SRP_TARGET_DEAD || |
f8b6e31e | 1432 | target->state == SRP_TARGET_REMOVED) |
76c75b25 | 1433 | return -1; |
1285b3a0 | 1434 | |
f8b6e31e | 1435 | init_completion(&target->tsk_mgmt_done); |
aef9ec39 | 1436 | |
e9684678 | 1437 | spin_lock_irq(&target->lock); |
bb12588a | 1438 | iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT); |
e9684678 | 1439 | spin_unlock_irq(&target->lock); |
76c75b25 | 1440 | |
aef9ec39 | 1441 | if (!iu) |
76c75b25 | 1442 | return -1; |
aef9ec39 | 1443 | |
19081f31 DD |
1444 | ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt, |
1445 | DMA_TO_DEVICE); | |
aef9ec39 RD |
1446 | tsk_mgmt = iu->buf; |
1447 | memset(tsk_mgmt, 0, sizeof *tsk_mgmt); | |
1448 | ||
1449 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
f8b6e31e DD |
1450 | tsk_mgmt->lun = cpu_to_be64((u64) lun << 48); |
1451 | tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT; | |
aef9ec39 | 1452 | tsk_mgmt->tsk_mgmt_func = func; |
f8b6e31e | 1453 | tsk_mgmt->task_tag = req_tag; |
aef9ec39 | 1454 | |
19081f31 DD |
1455 | ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt, |
1456 | DMA_TO_DEVICE); | |
76c75b25 BVA |
1457 | if (srp_post_send(target, iu, sizeof *tsk_mgmt)) { |
1458 | srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT); | |
1459 | return -1; | |
1460 | } | |
d945e1df | 1461 | |
f8b6e31e | 1462 | if (!wait_for_completion_timeout(&target->tsk_mgmt_done, |
aef9ec39 | 1463 | msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) |
d945e1df | 1464 | return -1; |
aef9ec39 | 1465 | |
d945e1df | 1466 | return 0; |
d945e1df RD |
1467 | } |
1468 | ||
aef9ec39 RD |
1469 | static int srp_abort(struct scsi_cmnd *scmnd) |
1470 | { | |
d945e1df | 1471 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
f8b6e31e | 1472 | struct srp_request *req = (struct srp_request *) scmnd->host_scribble; |
d945e1df RD |
1473 | int ret = SUCCESS; |
1474 | ||
7aa54bd7 | 1475 | shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n"); |
aef9ec39 | 1476 | |
f8b6e31e | 1477 | if (!req || target->qp_in_error) |
d945e1df | 1478 | return FAILED; |
f8b6e31e DD |
1479 | if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun, |
1480 | SRP_TSK_ABORT_TASK)) | |
d945e1df RD |
1481 | return FAILED; |
1482 | ||
f8b6e31e DD |
1483 | if (req->scmnd) { |
1484 | if (!target->tsk_mgmt_status) { | |
94a9174c | 1485 | srp_remove_req(target, req, 0); |
f8b6e31e DD |
1486 | scmnd->result = DID_ABORT << 16; |
1487 | } else | |
1488 | ret = FAILED; | |
1489 | } | |
d945e1df | 1490 | |
d945e1df | 1491 | return ret; |
aef9ec39 RD |
1492 | } |
1493 | ||
1494 | static int srp_reset_device(struct scsi_cmnd *scmnd) | |
1495 | { | |
d945e1df | 1496 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
536ae14e | 1497 | int i; |
d945e1df | 1498 | |
7aa54bd7 | 1499 | shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n"); |
aef9ec39 | 1500 | |
1033ff67 IR |
1501 | if (target->qp_in_error) |
1502 | return FAILED; | |
f8b6e31e DD |
1503 | if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun, |
1504 | SRP_TSK_LUN_RESET)) | |
d945e1df | 1505 | return FAILED; |
f8b6e31e | 1506 | if (target->tsk_mgmt_status) |
d945e1df RD |
1507 | return FAILED; |
1508 | ||
536ae14e BVA |
1509 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { |
1510 | struct srp_request *req = &target->req_ring[i]; | |
f8b6e31e | 1511 | if (req->scmnd && req->scmnd->device == scmnd->device) |
526b4caa | 1512 | srp_reset_req(target, req); |
536ae14e | 1513 | } |
d945e1df | 1514 | |
d945e1df | 1515 | return SUCCESS; |
aef9ec39 RD |
1516 | } |
1517 | ||
1518 | static int srp_reset_host(struct scsi_cmnd *scmnd) | |
1519 | { | |
1520 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
1521 | int ret = FAILED; | |
1522 | ||
7aa54bd7 | 1523 | shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n"); |
aef9ec39 RD |
1524 | |
1525 | if (!srp_reconnect_target(target)) | |
1526 | ret = SUCCESS; | |
1527 | ||
1528 | return ret; | |
1529 | } | |
1530 | ||
ee959b00 TJ |
1531 | static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr, |
1532 | char *buf) | |
6ecb0c84 | 1533 | { |
ee959b00 | 1534 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1535 | |
1536 | if (target->state == SRP_TARGET_DEAD || | |
1537 | target->state == SRP_TARGET_REMOVED) | |
1538 | return -ENODEV; | |
1539 | ||
1540 | return sprintf(buf, "0x%016llx\n", | |
1541 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1542 | } | |
1543 | ||
ee959b00 TJ |
1544 | static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr, |
1545 | char *buf) | |
6ecb0c84 | 1546 | { |
ee959b00 | 1547 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1548 | |
1549 | if (target->state == SRP_TARGET_DEAD || | |
1550 | target->state == SRP_TARGET_REMOVED) | |
1551 | return -ENODEV; | |
1552 | ||
1553 | return sprintf(buf, "0x%016llx\n", | |
1554 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
1555 | } | |
1556 | ||
ee959b00 TJ |
1557 | static ssize_t show_service_id(struct device *dev, |
1558 | struct device_attribute *attr, char *buf) | |
6ecb0c84 | 1559 | { |
ee959b00 | 1560 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1561 | |
1562 | if (target->state == SRP_TARGET_DEAD || | |
1563 | target->state == SRP_TARGET_REMOVED) | |
1564 | return -ENODEV; | |
1565 | ||
1566 | return sprintf(buf, "0x%016llx\n", | |
1567 | (unsigned long long) be64_to_cpu(target->service_id)); | |
1568 | } | |
1569 | ||
ee959b00 TJ |
1570 | static ssize_t show_pkey(struct device *dev, struct device_attribute *attr, |
1571 | char *buf) | |
6ecb0c84 | 1572 | { |
ee959b00 | 1573 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1574 | |
1575 | if (target->state == SRP_TARGET_DEAD || | |
1576 | target->state == SRP_TARGET_REMOVED) | |
1577 | return -ENODEV; | |
1578 | ||
1579 | return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); | |
1580 | } | |
1581 | ||
ee959b00 TJ |
1582 | static ssize_t show_dgid(struct device *dev, struct device_attribute *attr, |
1583 | char *buf) | |
6ecb0c84 | 1584 | { |
ee959b00 | 1585 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1586 | |
1587 | if (target->state == SRP_TARGET_DEAD || | |
1588 | target->state == SRP_TARGET_REMOVED) | |
1589 | return -ENODEV; | |
1590 | ||
5b095d98 | 1591 | return sprintf(buf, "%pI6\n", target->path.dgid.raw); |
6ecb0c84 RD |
1592 | } |
1593 | ||
ee959b00 TJ |
1594 | static ssize_t show_orig_dgid(struct device *dev, |
1595 | struct device_attribute *attr, char *buf) | |
3633b3d0 | 1596 | { |
ee959b00 | 1597 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
3633b3d0 IR |
1598 | |
1599 | if (target->state == SRP_TARGET_DEAD || | |
1600 | target->state == SRP_TARGET_REMOVED) | |
1601 | return -ENODEV; | |
1602 | ||
5b095d98 | 1603 | return sprintf(buf, "%pI6\n", target->orig_dgid); |
3633b3d0 IR |
1604 | } |
1605 | ||
89de7486 BVA |
1606 | static ssize_t show_req_lim(struct device *dev, |
1607 | struct device_attribute *attr, char *buf) | |
1608 | { | |
1609 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1610 | ||
1611 | if (target->state == SRP_TARGET_DEAD || | |
1612 | target->state == SRP_TARGET_REMOVED) | |
1613 | return -ENODEV; | |
1614 | ||
1615 | return sprintf(buf, "%d\n", target->req_lim); | |
1616 | } | |
1617 | ||
ee959b00 TJ |
1618 | static ssize_t show_zero_req_lim(struct device *dev, |
1619 | struct device_attribute *attr, char *buf) | |
6bfa24fa | 1620 | { |
ee959b00 | 1621 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6bfa24fa RD |
1622 | |
1623 | if (target->state == SRP_TARGET_DEAD || | |
1624 | target->state == SRP_TARGET_REMOVED) | |
1625 | return -ENODEV; | |
1626 | ||
1627 | return sprintf(buf, "%d\n", target->zero_req_lim); | |
1628 | } | |
1629 | ||
ee959b00 TJ |
1630 | static ssize_t show_local_ib_port(struct device *dev, |
1631 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 1632 | { |
ee959b00 | 1633 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 IR |
1634 | |
1635 | return sprintf(buf, "%d\n", target->srp_host->port); | |
1636 | } | |
1637 | ||
ee959b00 TJ |
1638 | static ssize_t show_local_ib_device(struct device *dev, |
1639 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 1640 | { |
ee959b00 | 1641 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 | 1642 | |
05321937 | 1643 | return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name); |
ded7f1a1 IR |
1644 | } |
1645 | ||
ee959b00 TJ |
1646 | static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); |
1647 | static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); | |
1648 | static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); | |
1649 | static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); | |
1650 | static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); | |
1651 | static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL); | |
89de7486 | 1652 | static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL); |
ee959b00 TJ |
1653 | static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); |
1654 | static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); | |
1655 | static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); | |
1656 | ||
1657 | static struct device_attribute *srp_host_attrs[] = { | |
1658 | &dev_attr_id_ext, | |
1659 | &dev_attr_ioc_guid, | |
1660 | &dev_attr_service_id, | |
1661 | &dev_attr_pkey, | |
1662 | &dev_attr_dgid, | |
1663 | &dev_attr_orig_dgid, | |
89de7486 | 1664 | &dev_attr_req_lim, |
ee959b00 TJ |
1665 | &dev_attr_zero_req_lim, |
1666 | &dev_attr_local_ib_port, | |
1667 | &dev_attr_local_ib_device, | |
6ecb0c84 RD |
1668 | NULL |
1669 | }; | |
1670 | ||
aef9ec39 RD |
1671 | static struct scsi_host_template srp_template = { |
1672 | .module = THIS_MODULE, | |
b7f008fd RD |
1673 | .name = "InfiniBand SRP initiator", |
1674 | .proc_name = DRV_NAME, | |
aef9ec39 RD |
1675 | .info = srp_target_info, |
1676 | .queuecommand = srp_queuecommand, | |
1677 | .eh_abort_handler = srp_abort, | |
1678 | .eh_device_reset_handler = srp_reset_device, | |
1679 | .eh_host_reset_handler = srp_reset_host, | |
dd5e6e38 | 1680 | .can_queue = SRP_CMD_SQ_SIZE, |
aef9ec39 | 1681 | .this_id = -1, |
dd5e6e38 | 1682 | .cmd_per_lun = SRP_CMD_SQ_SIZE, |
6ecb0c84 RD |
1683 | .use_clustering = ENABLE_CLUSTERING, |
1684 | .shost_attrs = srp_host_attrs | |
aef9ec39 RD |
1685 | }; |
1686 | ||
1687 | static int srp_add_target(struct srp_host *host, struct srp_target_port *target) | |
1688 | { | |
3236822b FT |
1689 | struct srp_rport_identifiers ids; |
1690 | struct srp_rport *rport; | |
1691 | ||
aef9ec39 RD |
1692 | sprintf(target->target_name, "SRP.T10:%016llX", |
1693 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1694 | ||
05321937 | 1695 | if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device)) |
aef9ec39 RD |
1696 | return -ENODEV; |
1697 | ||
3236822b FT |
1698 | memcpy(ids.port_id, &target->id_ext, 8); |
1699 | memcpy(ids.port_id + 8, &target->ioc_guid, 8); | |
aebd5e47 | 1700 | ids.roles = SRP_RPORT_ROLE_TARGET; |
3236822b FT |
1701 | rport = srp_rport_add(target->scsi_host, &ids); |
1702 | if (IS_ERR(rport)) { | |
1703 | scsi_remove_host(target->scsi_host); | |
1704 | return PTR_ERR(rport); | |
1705 | } | |
1706 | ||
b3589fd4 | 1707 | spin_lock(&host->target_lock); |
aef9ec39 | 1708 | list_add_tail(&target->list, &host->target_list); |
b3589fd4 | 1709 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
1710 | |
1711 | target->state = SRP_TARGET_LIVE; | |
1712 | ||
aef9ec39 | 1713 | scsi_scan_target(&target->scsi_host->shost_gendev, |
1962a4a1 | 1714 | 0, target->scsi_id, SCAN_WILD_CARD, 0); |
aef9ec39 RD |
1715 | |
1716 | return 0; | |
1717 | } | |
1718 | ||
ee959b00 | 1719 | static void srp_release_dev(struct device *dev) |
aef9ec39 RD |
1720 | { |
1721 | struct srp_host *host = | |
ee959b00 | 1722 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
1723 | |
1724 | complete(&host->released); | |
1725 | } | |
1726 | ||
1727 | static struct class srp_class = { | |
1728 | .name = "infiniband_srp", | |
ee959b00 | 1729 | .dev_release = srp_release_dev |
aef9ec39 RD |
1730 | }; |
1731 | ||
1732 | /* | |
1733 | * Target ports are added by writing | |
1734 | * | |
1735 | * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, | |
1736 | * pkey=<P_Key>,service_id=<service ID> | |
1737 | * | |
1738 | * to the add_target sysfs attribute. | |
1739 | */ | |
1740 | enum { | |
1741 | SRP_OPT_ERR = 0, | |
1742 | SRP_OPT_ID_EXT = 1 << 0, | |
1743 | SRP_OPT_IOC_GUID = 1 << 1, | |
1744 | SRP_OPT_DGID = 1 << 2, | |
1745 | SRP_OPT_PKEY = 1 << 3, | |
1746 | SRP_OPT_SERVICE_ID = 1 << 4, | |
1747 | SRP_OPT_MAX_SECT = 1 << 5, | |
52fb2b50 | 1748 | SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, |
0c0450db | 1749 | SRP_OPT_IO_CLASS = 1 << 7, |
01cb9bcb | 1750 | SRP_OPT_INITIATOR_EXT = 1 << 8, |
aef9ec39 RD |
1751 | SRP_OPT_ALL = (SRP_OPT_ID_EXT | |
1752 | SRP_OPT_IOC_GUID | | |
1753 | SRP_OPT_DGID | | |
1754 | SRP_OPT_PKEY | | |
1755 | SRP_OPT_SERVICE_ID), | |
1756 | }; | |
1757 | ||
a447c093 | 1758 | static const match_table_t srp_opt_tokens = { |
52fb2b50 VP |
1759 | { SRP_OPT_ID_EXT, "id_ext=%s" }, |
1760 | { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, | |
1761 | { SRP_OPT_DGID, "dgid=%s" }, | |
1762 | { SRP_OPT_PKEY, "pkey=%x" }, | |
1763 | { SRP_OPT_SERVICE_ID, "service_id=%s" }, | |
1764 | { SRP_OPT_MAX_SECT, "max_sect=%d" }, | |
1765 | { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, | |
0c0450db | 1766 | { SRP_OPT_IO_CLASS, "io_class=%x" }, |
01cb9bcb | 1767 | { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, |
52fb2b50 | 1768 | { SRP_OPT_ERR, NULL } |
aef9ec39 RD |
1769 | }; |
1770 | ||
1771 | static int srp_parse_options(const char *buf, struct srp_target_port *target) | |
1772 | { | |
1773 | char *options, *sep_opt; | |
1774 | char *p; | |
1775 | char dgid[3]; | |
1776 | substring_t args[MAX_OPT_ARGS]; | |
1777 | int opt_mask = 0; | |
1778 | int token; | |
1779 | int ret = -EINVAL; | |
1780 | int i; | |
1781 | ||
1782 | options = kstrdup(buf, GFP_KERNEL); | |
1783 | if (!options) | |
1784 | return -ENOMEM; | |
1785 | ||
1786 | sep_opt = options; | |
1787 | while ((p = strsep(&sep_opt, ",")) != NULL) { | |
1788 | if (!*p) | |
1789 | continue; | |
1790 | ||
1791 | token = match_token(p, srp_opt_tokens, args); | |
1792 | opt_mask |= token; | |
1793 | ||
1794 | switch (token) { | |
1795 | case SRP_OPT_ID_EXT: | |
1796 | p = match_strdup(args); | |
a20f3a6d IR |
1797 | if (!p) { |
1798 | ret = -ENOMEM; | |
1799 | goto out; | |
1800 | } | |
aef9ec39 RD |
1801 | target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
1802 | kfree(p); | |
1803 | break; | |
1804 | ||
1805 | case SRP_OPT_IOC_GUID: | |
1806 | p = match_strdup(args); | |
a20f3a6d IR |
1807 | if (!p) { |
1808 | ret = -ENOMEM; | |
1809 | goto out; | |
1810 | } | |
aef9ec39 RD |
1811 | target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
1812 | kfree(p); | |
1813 | break; | |
1814 | ||
1815 | case SRP_OPT_DGID: | |
1816 | p = match_strdup(args); | |
a20f3a6d IR |
1817 | if (!p) { |
1818 | ret = -ENOMEM; | |
1819 | goto out; | |
1820 | } | |
aef9ec39 RD |
1821 | if (strlen(p) != 32) { |
1822 | printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p); | |
ce1823f0 | 1823 | kfree(p); |
aef9ec39 RD |
1824 | goto out; |
1825 | } | |
1826 | ||
1827 | for (i = 0; i < 16; ++i) { | |
1828 | strlcpy(dgid, p + i * 2, 3); | |
1829 | target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); | |
1830 | } | |
bf17c1c7 | 1831 | kfree(p); |
3633b3d0 | 1832 | memcpy(target->orig_dgid, target->path.dgid.raw, 16); |
aef9ec39 RD |
1833 | break; |
1834 | ||
1835 | case SRP_OPT_PKEY: | |
1836 | if (match_hex(args, &token)) { | |
1837 | printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p); | |
1838 | goto out; | |
1839 | } | |
1840 | target->path.pkey = cpu_to_be16(token); | |
1841 | break; | |
1842 | ||
1843 | case SRP_OPT_SERVICE_ID: | |
1844 | p = match_strdup(args); | |
a20f3a6d IR |
1845 | if (!p) { |
1846 | ret = -ENOMEM; | |
1847 | goto out; | |
1848 | } | |
aef9ec39 | 1849 | target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
247e020e | 1850 | target->path.service_id = target->service_id; |
aef9ec39 RD |
1851 | kfree(p); |
1852 | break; | |
1853 | ||
1854 | case SRP_OPT_MAX_SECT: | |
1855 | if (match_int(args, &token)) { | |
1856 | printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p); | |
1857 | goto out; | |
1858 | } | |
1859 | target->scsi_host->max_sectors = token; | |
1860 | break; | |
1861 | ||
52fb2b50 VP |
1862 | case SRP_OPT_MAX_CMD_PER_LUN: |
1863 | if (match_int(args, &token)) { | |
1864 | printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p); | |
1865 | goto out; | |
1866 | } | |
dd5e6e38 | 1867 | target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE); |
52fb2b50 VP |
1868 | break; |
1869 | ||
0c0450db R |
1870 | case SRP_OPT_IO_CLASS: |
1871 | if (match_hex(args, &token)) { | |
1872 | printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p); | |
1873 | goto out; | |
1874 | } | |
1875 | if (token != SRP_REV10_IB_IO_CLASS && | |
1876 | token != SRP_REV16A_IB_IO_CLASS) { | |
1877 | printk(KERN_WARNING PFX "unknown IO class parameter value" | |
1878 | " %x specified (use %x or %x).\n", | |
1879 | token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS); | |
1880 | goto out; | |
1881 | } | |
1882 | target->io_class = token; | |
1883 | break; | |
1884 | ||
01cb9bcb IR |
1885 | case SRP_OPT_INITIATOR_EXT: |
1886 | p = match_strdup(args); | |
a20f3a6d IR |
1887 | if (!p) { |
1888 | ret = -ENOMEM; | |
1889 | goto out; | |
1890 | } | |
01cb9bcb IR |
1891 | target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
1892 | kfree(p); | |
1893 | break; | |
1894 | ||
aef9ec39 RD |
1895 | default: |
1896 | printk(KERN_WARNING PFX "unknown parameter or missing value " | |
1897 | "'%s' in target creation request\n", p); | |
1898 | goto out; | |
1899 | } | |
1900 | } | |
1901 | ||
1902 | if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) | |
1903 | ret = 0; | |
1904 | else | |
1905 | for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) | |
1906 | if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && | |
1907 | !(srp_opt_tokens[i].token & opt_mask)) | |
1908 | printk(KERN_WARNING PFX "target creation request is " | |
1909 | "missing parameter '%s'\n", | |
1910 | srp_opt_tokens[i].pattern); | |
1911 | ||
1912 | out: | |
1913 | kfree(options); | |
1914 | return ret; | |
1915 | } | |
1916 | ||
ee959b00 TJ |
1917 | static ssize_t srp_create_target(struct device *dev, |
1918 | struct device_attribute *attr, | |
aef9ec39 RD |
1919 | const char *buf, size_t count) |
1920 | { | |
1921 | struct srp_host *host = | |
ee959b00 | 1922 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
1923 | struct Scsi_Host *target_host; |
1924 | struct srp_target_port *target; | |
1925 | int ret; | |
1926 | int i; | |
1927 | ||
1928 | target_host = scsi_host_alloc(&srp_template, | |
1929 | sizeof (struct srp_target_port)); | |
1930 | if (!target_host) | |
1931 | return -ENOMEM; | |
1932 | ||
3236822b | 1933 | target_host->transportt = ib_srp_transport_template; |
3c8edf0e AR |
1934 | target_host->max_lun = SRP_MAX_LUN; |
1935 | target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; | |
5f068992 | 1936 | |
aef9ec39 | 1937 | target = host_to_target(target_host); |
aef9ec39 | 1938 | |
0c0450db | 1939 | target->io_class = SRP_REV16A_IB_IO_CLASS; |
aef9ec39 RD |
1940 | target->scsi_host = target_host; |
1941 | target->srp_host = host; | |
9af76271 DD |
1942 | target->lkey = host->srp_dev->mr->lkey; |
1943 | target->rkey = host->srp_dev->mr->rkey; | |
aef9ec39 | 1944 | |
e9684678 | 1945 | spin_lock_init(&target->lock); |
dcb4cb85 | 1946 | INIT_LIST_HEAD(&target->free_tx); |
d945e1df | 1947 | INIT_LIST_HEAD(&target->free_reqs); |
dd5e6e38 | 1948 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { |
d945e1df RD |
1949 | target->req_ring[i].index = i; |
1950 | list_add_tail(&target->req_ring[i].list, &target->free_reqs); | |
1951 | } | |
aef9ec39 RD |
1952 | |
1953 | ret = srp_parse_options(buf, target); | |
1954 | if (ret) | |
1955 | goto err; | |
1956 | ||
969a60f9 | 1957 | ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid); |
aef9ec39 | 1958 | |
7aa54bd7 DD |
1959 | shost_printk(KERN_DEBUG, target->scsi_host, PFX |
1960 | "new target: id_ext %016llx ioc_guid %016llx pkey %04x " | |
5b095d98 | 1961 | "service_id %016llx dgid %pI6\n", |
aef9ec39 RD |
1962 | (unsigned long long) be64_to_cpu(target->id_ext), |
1963 | (unsigned long long) be64_to_cpu(target->ioc_guid), | |
1964 | be16_to_cpu(target->path.pkey), | |
1965 | (unsigned long long) be64_to_cpu(target->service_id), | |
8867cd7c | 1966 | target->path.dgid.raw); |
aef9ec39 RD |
1967 | |
1968 | ret = srp_create_target_ib(target); | |
1969 | if (ret) | |
1970 | goto err; | |
1971 | ||
9fe4bcf4 DD |
1972 | ret = srp_new_cm_id(target); |
1973 | if (ret) | |
aef9ec39 | 1974 | goto err_free; |
aef9ec39 | 1975 | |
1033ff67 | 1976 | target->qp_in_error = 0; |
aef9ec39 RD |
1977 | ret = srp_connect_target(target); |
1978 | if (ret) { | |
7aa54bd7 DD |
1979 | shost_printk(KERN_ERR, target->scsi_host, |
1980 | PFX "Connection failed\n"); | |
aef9ec39 RD |
1981 | goto err_cm_id; |
1982 | } | |
1983 | ||
1984 | ret = srp_add_target(host, target); | |
1985 | if (ret) | |
1986 | goto err_disconnect; | |
1987 | ||
1988 | return count; | |
1989 | ||
1990 | err_disconnect: | |
1991 | srp_disconnect_target(target); | |
1992 | ||
1993 | err_cm_id: | |
1994 | ib_destroy_cm_id(target->cm_id); | |
1995 | ||
1996 | err_free: | |
1997 | srp_free_target_ib(target); | |
1998 | ||
1999 | err: | |
2000 | scsi_host_put(target_host); | |
2001 | ||
2002 | return ret; | |
2003 | } | |
2004 | ||
ee959b00 | 2005 | static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); |
aef9ec39 | 2006 | |
ee959b00 TJ |
2007 | static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, |
2008 | char *buf) | |
aef9ec39 | 2009 | { |
ee959b00 | 2010 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 | 2011 | |
05321937 | 2012 | return sprintf(buf, "%s\n", host->srp_dev->dev->name); |
aef9ec39 RD |
2013 | } |
2014 | ||
ee959b00 | 2015 | static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
aef9ec39 | 2016 | |
ee959b00 TJ |
2017 | static ssize_t show_port(struct device *dev, struct device_attribute *attr, |
2018 | char *buf) | |
aef9ec39 | 2019 | { |
ee959b00 | 2020 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2021 | |
2022 | return sprintf(buf, "%d\n", host->port); | |
2023 | } | |
2024 | ||
ee959b00 | 2025 | static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); |
aef9ec39 | 2026 | |
f5358a17 | 2027 | static struct srp_host *srp_add_port(struct srp_device *device, u8 port) |
aef9ec39 RD |
2028 | { |
2029 | struct srp_host *host; | |
2030 | ||
2031 | host = kzalloc(sizeof *host, GFP_KERNEL); | |
2032 | if (!host) | |
2033 | return NULL; | |
2034 | ||
2035 | INIT_LIST_HEAD(&host->target_list); | |
b3589fd4 | 2036 | spin_lock_init(&host->target_lock); |
aef9ec39 | 2037 | init_completion(&host->released); |
05321937 | 2038 | host->srp_dev = device; |
aef9ec39 RD |
2039 | host->port = port; |
2040 | ||
ee959b00 TJ |
2041 | host->dev.class = &srp_class; |
2042 | host->dev.parent = device->dev->dma_device; | |
d927e38c | 2043 | dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port); |
aef9ec39 | 2044 | |
ee959b00 | 2045 | if (device_register(&host->dev)) |
f5358a17 | 2046 | goto free_host; |
ee959b00 | 2047 | if (device_create_file(&host->dev, &dev_attr_add_target)) |
aef9ec39 | 2048 | goto err_class; |
ee959b00 | 2049 | if (device_create_file(&host->dev, &dev_attr_ibdev)) |
aef9ec39 | 2050 | goto err_class; |
ee959b00 | 2051 | if (device_create_file(&host->dev, &dev_attr_port)) |
aef9ec39 RD |
2052 | goto err_class; |
2053 | ||
2054 | return host; | |
2055 | ||
2056 | err_class: | |
ee959b00 | 2057 | device_unregister(&host->dev); |
aef9ec39 | 2058 | |
f5358a17 | 2059 | free_host: |
aef9ec39 RD |
2060 | kfree(host); |
2061 | ||
2062 | return NULL; | |
2063 | } | |
2064 | ||
2065 | static void srp_add_one(struct ib_device *device) | |
2066 | { | |
f5358a17 RD |
2067 | struct srp_device *srp_dev; |
2068 | struct ib_device_attr *dev_attr; | |
2069 | struct ib_fmr_pool_param fmr_param; | |
aef9ec39 | 2070 | struct srp_host *host; |
aef9ec39 RD |
2071 | int s, e, p; |
2072 | ||
f5358a17 RD |
2073 | dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); |
2074 | if (!dev_attr) | |
cf311cd4 | 2075 | return; |
aef9ec39 | 2076 | |
f5358a17 RD |
2077 | if (ib_query_device(device, dev_attr)) { |
2078 | printk(KERN_WARNING PFX "Query device failed for %s\n", | |
2079 | device->name); | |
2080 | goto free_attr; | |
2081 | } | |
2082 | ||
2083 | srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); | |
2084 | if (!srp_dev) | |
2085 | goto free_attr; | |
2086 | ||
2087 | /* | |
2088 | * Use the smallest page size supported by the HCA, down to a | |
2089 | * minimum of 512 bytes (which is the smallest sector that a | |
2090 | * SCSI command will ever carry). | |
2091 | */ | |
2092 | srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1); | |
2093 | srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift; | |
bf628dc2 | 2094 | srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1); |
f5358a17 RD |
2095 | |
2096 | INIT_LIST_HEAD(&srp_dev->dev_list); | |
2097 | ||
2098 | srp_dev->dev = device; | |
2099 | srp_dev->pd = ib_alloc_pd(device); | |
2100 | if (IS_ERR(srp_dev->pd)) | |
2101 | goto free_dev; | |
2102 | ||
2103 | srp_dev->mr = ib_get_dma_mr(srp_dev->pd, | |
2104 | IB_ACCESS_LOCAL_WRITE | | |
2105 | IB_ACCESS_REMOTE_READ | | |
2106 | IB_ACCESS_REMOTE_WRITE); | |
2107 | if (IS_ERR(srp_dev->mr)) | |
2108 | goto err_pd; | |
2109 | ||
2110 | memset(&fmr_param, 0, sizeof fmr_param); | |
2111 | fmr_param.pool_size = SRP_FMR_POOL_SIZE; | |
2112 | fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; | |
2113 | fmr_param.cache = 1; | |
2114 | fmr_param.max_pages_per_fmr = SRP_FMR_SIZE; | |
2115 | fmr_param.page_shift = srp_dev->fmr_page_shift; | |
2116 | fmr_param.access = (IB_ACCESS_LOCAL_WRITE | | |
2117 | IB_ACCESS_REMOTE_WRITE | | |
2118 | IB_ACCESS_REMOTE_READ); | |
2119 | ||
2120 | srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); | |
2121 | if (IS_ERR(srp_dev->fmr_pool)) | |
2122 | srp_dev->fmr_pool = NULL; | |
aef9ec39 | 2123 | |
07ebafba | 2124 | if (device->node_type == RDMA_NODE_IB_SWITCH) { |
aef9ec39 RD |
2125 | s = 0; |
2126 | e = 0; | |
2127 | } else { | |
2128 | s = 1; | |
2129 | e = device->phys_port_cnt; | |
2130 | } | |
2131 | ||
2132 | for (p = s; p <= e; ++p) { | |
f5358a17 | 2133 | host = srp_add_port(srp_dev, p); |
aef9ec39 | 2134 | if (host) |
f5358a17 | 2135 | list_add_tail(&host->list, &srp_dev->dev_list); |
aef9ec39 RD |
2136 | } |
2137 | ||
f5358a17 RD |
2138 | ib_set_client_data(device, &srp_client, srp_dev); |
2139 | ||
2140 | goto free_attr; | |
2141 | ||
2142 | err_pd: | |
2143 | ib_dealloc_pd(srp_dev->pd); | |
2144 | ||
2145 | free_dev: | |
2146 | kfree(srp_dev); | |
2147 | ||
2148 | free_attr: | |
2149 | kfree(dev_attr); | |
aef9ec39 RD |
2150 | } |
2151 | ||
2152 | static void srp_remove_one(struct ib_device *device) | |
2153 | { | |
f5358a17 | 2154 | struct srp_device *srp_dev; |
aef9ec39 RD |
2155 | struct srp_host *host, *tmp_host; |
2156 | LIST_HEAD(target_list); | |
2157 | struct srp_target_port *target, *tmp_target; | |
aef9ec39 | 2158 | |
f5358a17 | 2159 | srp_dev = ib_get_client_data(device, &srp_client); |
aef9ec39 | 2160 | |
f5358a17 | 2161 | list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { |
ee959b00 | 2162 | device_unregister(&host->dev); |
aef9ec39 RD |
2163 | /* |
2164 | * Wait for the sysfs entry to go away, so that no new | |
2165 | * target ports can be created. | |
2166 | */ | |
2167 | wait_for_completion(&host->released); | |
2168 | ||
2169 | /* | |
2170 | * Mark all target ports as removed, so we stop queueing | |
2171 | * commands and don't try to reconnect. | |
2172 | */ | |
b3589fd4 | 2173 | spin_lock(&host->target_lock); |
549c5fc2 | 2174 | list_for_each_entry(target, &host->target_list, list) { |
e9684678 | 2175 | spin_lock_irq(&target->lock); |
0c5b3952 | 2176 | target->state = SRP_TARGET_REMOVED; |
e9684678 | 2177 | spin_unlock_irq(&target->lock); |
aef9ec39 | 2178 | } |
b3589fd4 | 2179 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
2180 | |
2181 | /* | |
2182 | * Wait for any reconnection tasks that may have | |
2183 | * started before we marked our target ports as | |
2184 | * removed, and any target port removal tasks. | |
2185 | */ | |
f0626710 | 2186 | flush_workqueue(ib_wq); |
aef9ec39 RD |
2187 | |
2188 | list_for_each_entry_safe(target, tmp_target, | |
2189 | &host->target_list, list) { | |
b0e47c8b | 2190 | srp_remove_host(target->scsi_host); |
ad696989 | 2191 | scsi_remove_host(target->scsi_host); |
aef9ec39 RD |
2192 | srp_disconnect_target(target); |
2193 | ib_destroy_cm_id(target->cm_id); | |
2194 | srp_free_target_ib(target); | |
2195 | scsi_host_put(target->scsi_host); | |
2196 | } | |
2197 | ||
aef9ec39 RD |
2198 | kfree(host); |
2199 | } | |
2200 | ||
f5358a17 RD |
2201 | if (srp_dev->fmr_pool) |
2202 | ib_destroy_fmr_pool(srp_dev->fmr_pool); | |
2203 | ib_dereg_mr(srp_dev->mr); | |
2204 | ib_dealloc_pd(srp_dev->pd); | |
2205 | ||
2206 | kfree(srp_dev); | |
aef9ec39 RD |
2207 | } |
2208 | ||
3236822b FT |
2209 | static struct srp_function_template ib_srp_transport_functions = { |
2210 | }; | |
2211 | ||
aef9ec39 RD |
2212 | static int __init srp_init_module(void) |
2213 | { | |
2214 | int ret; | |
2215 | ||
dcb4cb85 | 2216 | BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *)); |
dd5e6e38 | 2217 | |
1e89a194 DD |
2218 | if (srp_sg_tablesize > 255) { |
2219 | printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n"); | |
2220 | srp_sg_tablesize = 255; | |
2221 | } | |
2222 | ||
3236822b FT |
2223 | ib_srp_transport_template = |
2224 | srp_attach_transport(&ib_srp_transport_functions); | |
2225 | if (!ib_srp_transport_template) | |
2226 | return -ENOMEM; | |
2227 | ||
74b0a15b VP |
2228 | srp_template.sg_tablesize = srp_sg_tablesize; |
2229 | srp_max_iu_len = (sizeof (struct srp_cmd) + | |
2230 | sizeof (struct srp_indirect_buf) + | |
2231 | srp_sg_tablesize * 16); | |
2232 | ||
aef9ec39 RD |
2233 | ret = class_register(&srp_class); |
2234 | if (ret) { | |
2235 | printk(KERN_ERR PFX "couldn't register class infiniband_srp\n"); | |
3236822b | 2236 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
2237 | return ret; |
2238 | } | |
2239 | ||
c1a0b23b MT |
2240 | ib_sa_register_client(&srp_sa_client); |
2241 | ||
aef9ec39 RD |
2242 | ret = ib_register_client(&srp_client); |
2243 | if (ret) { | |
2244 | printk(KERN_ERR PFX "couldn't register IB client\n"); | |
3236822b | 2245 | srp_release_transport(ib_srp_transport_template); |
c1a0b23b | 2246 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 RD |
2247 | class_unregister(&srp_class); |
2248 | return ret; | |
2249 | } | |
2250 | ||
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | static void __exit srp_cleanup_module(void) | |
2255 | { | |
2256 | ib_unregister_client(&srp_client); | |
c1a0b23b | 2257 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 | 2258 | class_unregister(&srp_class); |
3236822b | 2259 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
2260 | } |
2261 | ||
2262 | module_init(srp_init_module); | |
2263 | module_exit(srp_cleanup_module); |