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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 | ||
559ce8f1 IR |
75 | static int mellanox_workarounds = 1; |
76 | ||
77 | module_param(mellanox_workarounds, int, 0444); | |
78 | MODULE_PARM_DESC(mellanox_workarounds, | |
79 | "Enable workarounds for Mellanox SRP target bugs if != 0"); | |
80 | ||
aef9ec39 RD |
81 | static void srp_add_one(struct ib_device *device); |
82 | static void srp_remove_one(struct ib_device *device); | |
9c03dc9f BVA |
83 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr); |
84 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr); | |
aef9ec39 RD |
85 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); |
86 | ||
3236822b FT |
87 | static struct scsi_transport_template *ib_srp_transport_template; |
88 | ||
aef9ec39 RD |
89 | static struct ib_client srp_client = { |
90 | .name = "srp", | |
91 | .add = srp_add_one, | |
92 | .remove = srp_remove_one | |
93 | }; | |
94 | ||
c1a0b23b MT |
95 | static struct ib_sa_client srp_sa_client; |
96 | ||
aef9ec39 RD |
97 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) |
98 | { | |
99 | return (struct srp_target_port *) host->hostdata; | |
100 | } | |
101 | ||
102 | static const char *srp_target_info(struct Scsi_Host *host) | |
103 | { | |
104 | return host_to_target(host)->target_name; | |
105 | } | |
106 | ||
5d7cbfd6 RD |
107 | static int srp_target_is_topspin(struct srp_target_port *target) |
108 | { | |
109 | static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; | |
3d1ff48d | 110 | static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d }; |
5d7cbfd6 RD |
111 | |
112 | return topspin_workarounds && | |
3d1ff48d RK |
113 | (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) || |
114 | !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui)); | |
5d7cbfd6 RD |
115 | } |
116 | ||
117 | static int srp_target_is_mellanox(struct srp_target_port *target) | |
118 | { | |
119 | static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 }; | |
120 | ||
121 | return mellanox_workarounds && | |
122 | !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui); | |
123 | } | |
124 | ||
aef9ec39 RD |
125 | static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, |
126 | gfp_t gfp_mask, | |
127 | enum dma_data_direction direction) | |
128 | { | |
129 | struct srp_iu *iu; | |
130 | ||
131 | iu = kmalloc(sizeof *iu, gfp_mask); | |
132 | if (!iu) | |
133 | goto out; | |
134 | ||
135 | iu->buf = kzalloc(size, gfp_mask); | |
136 | if (!iu->buf) | |
137 | goto out_free_iu; | |
138 | ||
05321937 GKH |
139 | iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size, |
140 | direction); | |
141 | if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma)) | |
aef9ec39 RD |
142 | goto out_free_buf; |
143 | ||
144 | iu->size = size; | |
145 | iu->direction = direction; | |
146 | ||
147 | return iu; | |
148 | ||
149 | out_free_buf: | |
150 | kfree(iu->buf); | |
151 | out_free_iu: | |
152 | kfree(iu); | |
153 | out: | |
154 | return NULL; | |
155 | } | |
156 | ||
157 | static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) | |
158 | { | |
159 | if (!iu) | |
160 | return; | |
161 | ||
05321937 GKH |
162 | ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size, |
163 | iu->direction); | |
aef9ec39 RD |
164 | kfree(iu->buf); |
165 | kfree(iu); | |
166 | } | |
167 | ||
168 | static void srp_qp_event(struct ib_event *event, void *context) | |
169 | { | |
170 | printk(KERN_ERR PFX "QP event %d\n", event->event); | |
171 | } | |
172 | ||
173 | static int srp_init_qp(struct srp_target_port *target, | |
174 | struct ib_qp *qp) | |
175 | { | |
176 | struct ib_qp_attr *attr; | |
177 | int ret; | |
178 | ||
179 | attr = kmalloc(sizeof *attr, GFP_KERNEL); | |
180 | if (!attr) | |
181 | return -ENOMEM; | |
182 | ||
969a60f9 RD |
183 | ret = ib_find_pkey(target->srp_host->srp_dev->dev, |
184 | target->srp_host->port, | |
185 | be16_to_cpu(target->path.pkey), | |
186 | &attr->pkey_index); | |
aef9ec39 RD |
187 | if (ret) |
188 | goto out; | |
189 | ||
190 | attr->qp_state = IB_QPS_INIT; | |
191 | attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | | |
192 | IB_ACCESS_REMOTE_WRITE); | |
193 | attr->port_num = target->srp_host->port; | |
194 | ||
195 | ret = ib_modify_qp(qp, attr, | |
196 | IB_QP_STATE | | |
197 | IB_QP_PKEY_INDEX | | |
198 | IB_QP_ACCESS_FLAGS | | |
199 | IB_QP_PORT); | |
200 | ||
201 | out: | |
202 | kfree(attr); | |
203 | return ret; | |
204 | } | |
205 | ||
9fe4bcf4 DD |
206 | static int srp_new_cm_id(struct srp_target_port *target) |
207 | { | |
208 | struct ib_cm_id *new_cm_id; | |
209 | ||
05321937 | 210 | new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev, |
9fe4bcf4 DD |
211 | srp_cm_handler, target); |
212 | if (IS_ERR(new_cm_id)) | |
213 | return PTR_ERR(new_cm_id); | |
214 | ||
215 | if (target->cm_id) | |
216 | ib_destroy_cm_id(target->cm_id); | |
217 | target->cm_id = new_cm_id; | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
aef9ec39 RD |
222 | static int srp_create_target_ib(struct srp_target_port *target) |
223 | { | |
224 | struct ib_qp_init_attr *init_attr; | |
225 | int ret; | |
226 | ||
227 | init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); | |
228 | if (!init_attr) | |
229 | return -ENOMEM; | |
230 | ||
9c03dc9f BVA |
231 | target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev, |
232 | srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0); | |
233 | if (IS_ERR(target->recv_cq)) { | |
234 | ret = PTR_ERR(target->recv_cq); | |
da9d2f07 | 235 | goto err; |
aef9ec39 RD |
236 | } |
237 | ||
9c03dc9f BVA |
238 | target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev, |
239 | srp_send_completion, NULL, target, SRP_SQ_SIZE, 0); | |
240 | if (IS_ERR(target->send_cq)) { | |
241 | ret = PTR_ERR(target->send_cq); | |
da9d2f07 | 242 | goto err_recv_cq; |
9c03dc9f BVA |
243 | } |
244 | ||
245 | ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP); | |
aef9ec39 RD |
246 | |
247 | init_attr->event_handler = srp_qp_event; | |
248 | init_attr->cap.max_send_wr = SRP_SQ_SIZE; | |
249 | init_attr->cap.max_recv_wr = SRP_RQ_SIZE; | |
250 | init_attr->cap.max_recv_sge = 1; | |
251 | init_attr->cap.max_send_sge = 1; | |
252 | init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; | |
253 | init_attr->qp_type = IB_QPT_RC; | |
9c03dc9f BVA |
254 | init_attr->send_cq = target->send_cq; |
255 | init_attr->recv_cq = target->recv_cq; | |
aef9ec39 | 256 | |
05321937 | 257 | target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr); |
aef9ec39 RD |
258 | if (IS_ERR(target->qp)) { |
259 | ret = PTR_ERR(target->qp); | |
da9d2f07 | 260 | goto err_send_cq; |
aef9ec39 RD |
261 | } |
262 | ||
263 | ret = srp_init_qp(target, target->qp); | |
da9d2f07 RD |
264 | if (ret) |
265 | goto err_qp; | |
aef9ec39 | 266 | |
da9d2f07 RD |
267 | kfree(init_attr); |
268 | return 0; | |
269 | ||
270 | err_qp: | |
271 | ib_destroy_qp(target->qp); | |
272 | ||
273 | err_send_cq: | |
274 | ib_destroy_cq(target->send_cq); | |
275 | ||
276 | err_recv_cq: | |
277 | ib_destroy_cq(target->recv_cq); | |
278 | ||
279 | err: | |
aef9ec39 RD |
280 | kfree(init_attr); |
281 | return ret; | |
282 | } | |
283 | ||
284 | static void srp_free_target_ib(struct srp_target_port *target) | |
285 | { | |
286 | int i; | |
287 | ||
288 | ib_destroy_qp(target->qp); | |
9c03dc9f BVA |
289 | ib_destroy_cq(target->send_cq); |
290 | ib_destroy_cq(target->recv_cq); | |
aef9ec39 RD |
291 | |
292 | for (i = 0; i < SRP_RQ_SIZE; ++i) | |
293 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
dd5e6e38 | 294 | for (i = 0; i < SRP_SQ_SIZE; ++i) |
aef9ec39 RD |
295 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
296 | } | |
297 | ||
298 | static void srp_path_rec_completion(int status, | |
299 | struct ib_sa_path_rec *pathrec, | |
300 | void *target_ptr) | |
301 | { | |
302 | struct srp_target_port *target = target_ptr; | |
303 | ||
304 | target->status = status; | |
305 | if (status) | |
7aa54bd7 DD |
306 | shost_printk(KERN_ERR, target->scsi_host, |
307 | PFX "Got failed path rec status %d\n", status); | |
aef9ec39 RD |
308 | else |
309 | target->path = *pathrec; | |
310 | complete(&target->done); | |
311 | } | |
312 | ||
313 | static int srp_lookup_path(struct srp_target_port *target) | |
314 | { | |
315 | target->path.numb_path = 1; | |
316 | ||
317 | init_completion(&target->done); | |
318 | ||
c1a0b23b | 319 | target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, |
05321937 | 320 | target->srp_host->srp_dev->dev, |
aef9ec39 RD |
321 | target->srp_host->port, |
322 | &target->path, | |
247e020e | 323 | IB_SA_PATH_REC_SERVICE_ID | |
aef9ec39 RD |
324 | IB_SA_PATH_REC_DGID | |
325 | IB_SA_PATH_REC_SGID | | |
326 | IB_SA_PATH_REC_NUMB_PATH | | |
327 | IB_SA_PATH_REC_PKEY, | |
328 | SRP_PATH_REC_TIMEOUT_MS, | |
329 | GFP_KERNEL, | |
330 | srp_path_rec_completion, | |
331 | target, &target->path_query); | |
332 | if (target->path_query_id < 0) | |
333 | return target->path_query_id; | |
334 | ||
335 | wait_for_completion(&target->done); | |
336 | ||
337 | if (target->status < 0) | |
7aa54bd7 DD |
338 | shost_printk(KERN_WARNING, target->scsi_host, |
339 | PFX "Path record query failed\n"); | |
aef9ec39 RD |
340 | |
341 | return target->status; | |
342 | } | |
343 | ||
344 | static int srp_send_req(struct srp_target_port *target) | |
345 | { | |
346 | struct { | |
347 | struct ib_cm_req_param param; | |
348 | struct srp_login_req priv; | |
349 | } *req = NULL; | |
350 | int status; | |
351 | ||
352 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
353 | if (!req) | |
354 | return -ENOMEM; | |
355 | ||
356 | req->param.primary_path = &target->path; | |
357 | req->param.alternate_path = NULL; | |
358 | req->param.service_id = target->service_id; | |
359 | req->param.qp_num = target->qp->qp_num; | |
360 | req->param.qp_type = target->qp->qp_type; | |
361 | req->param.private_data = &req->priv; | |
362 | req->param.private_data_len = sizeof req->priv; | |
363 | req->param.flow_control = 1; | |
364 | ||
365 | get_random_bytes(&req->param.starting_psn, 4); | |
366 | req->param.starting_psn &= 0xffffff; | |
367 | ||
368 | /* | |
369 | * Pick some arbitrary defaults here; we could make these | |
370 | * module parameters if anyone cared about setting them. | |
371 | */ | |
372 | req->param.responder_resources = 4; | |
373 | req->param.remote_cm_response_timeout = 20; | |
374 | req->param.local_cm_response_timeout = 20; | |
375 | req->param.retry_count = 7; | |
376 | req->param.rnr_retry_count = 7; | |
377 | req->param.max_cm_retries = 15; | |
378 | ||
379 | req->priv.opcode = SRP_LOGIN_REQ; | |
380 | req->priv.tag = 0; | |
74b0a15b | 381 | req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len); |
aef9ec39 RD |
382 | req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
383 | SRP_BUF_FORMAT_INDIRECT); | |
0c0450db | 384 | /* |
3cd96564 | 385 | * In the published SRP specification (draft rev. 16a), the |
0c0450db R |
386 | * port identifier format is 8 bytes of ID extension followed |
387 | * by 8 bytes of GUID. Older drafts put the two halves in the | |
388 | * opposite order, so that the GUID comes first. | |
389 | * | |
390 | * Targets conforming to these obsolete drafts can be | |
391 | * recognized by the I/O Class they report. | |
392 | */ | |
393 | if (target->io_class == SRP_REV10_IB_IO_CLASS) { | |
394 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb | 395 | &target->path.sgid.global.interface_id, 8); |
0c0450db | 396 | memcpy(req->priv.initiator_port_id + 8, |
01cb9bcb | 397 | &target->initiator_ext, 8); |
0c0450db R |
398 | memcpy(req->priv.target_port_id, &target->ioc_guid, 8); |
399 | memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); | |
400 | } else { | |
401 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb IR |
402 | &target->initiator_ext, 8); |
403 | memcpy(req->priv.initiator_port_id + 8, | |
404 | &target->path.sgid.global.interface_id, 8); | |
0c0450db R |
405 | memcpy(req->priv.target_port_id, &target->id_ext, 8); |
406 | memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); | |
407 | } | |
408 | ||
aef9ec39 RD |
409 | /* |
410 | * Topspin/Cisco SRP targets will reject our login unless we | |
01cb9bcb IR |
411 | * zero out the first 8 bytes of our initiator port ID and set |
412 | * the second 8 bytes to the local node GUID. | |
aef9ec39 | 413 | */ |
5d7cbfd6 | 414 | if (srp_target_is_topspin(target)) { |
7aa54bd7 DD |
415 | shost_printk(KERN_DEBUG, target->scsi_host, |
416 | PFX "Topspin/Cisco initiator port ID workaround " | |
417 | "activated for target GUID %016llx\n", | |
418 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
aef9ec39 | 419 | memset(req->priv.initiator_port_id, 0, 8); |
01cb9bcb | 420 | memcpy(req->priv.initiator_port_id + 8, |
05321937 | 421 | &target->srp_host->srp_dev->dev->node_guid, 8); |
aef9ec39 | 422 | } |
aef9ec39 RD |
423 | |
424 | status = ib_send_cm_req(target->cm_id, &req->param); | |
425 | ||
426 | kfree(req); | |
427 | ||
428 | return status; | |
429 | } | |
430 | ||
431 | static void srp_disconnect_target(struct srp_target_port *target) | |
432 | { | |
433 | /* XXX should send SRP_I_LOGOUT request */ | |
434 | ||
435 | init_completion(&target->done); | |
e6581056 | 436 | if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { |
7aa54bd7 DD |
437 | shost_printk(KERN_DEBUG, target->scsi_host, |
438 | PFX "Sending CM DREQ failed\n"); | |
e6581056 RD |
439 | return; |
440 | } | |
aef9ec39 RD |
441 | wait_for_completion(&target->done); |
442 | } | |
443 | ||
c4028958 | 444 | static void srp_remove_work(struct work_struct *work) |
aef9ec39 | 445 | { |
c4028958 DH |
446 | struct srp_target_port *target = |
447 | container_of(work, struct srp_target_port, work); | |
aef9ec39 RD |
448 | |
449 | spin_lock_irq(target->scsi_host->host_lock); | |
450 | if (target->state != SRP_TARGET_DEAD) { | |
451 | spin_unlock_irq(target->scsi_host->host_lock); | |
aef9ec39 RD |
452 | return; |
453 | } | |
454 | target->state = SRP_TARGET_REMOVED; | |
455 | spin_unlock_irq(target->scsi_host->host_lock); | |
456 | ||
b3589fd4 | 457 | spin_lock(&target->srp_host->target_lock); |
aef9ec39 | 458 | list_del(&target->list); |
b3589fd4 | 459 | spin_unlock(&target->srp_host->target_lock); |
aef9ec39 | 460 | |
3236822b | 461 | srp_remove_host(target->scsi_host); |
aef9ec39 RD |
462 | scsi_remove_host(target->scsi_host); |
463 | ib_destroy_cm_id(target->cm_id); | |
464 | srp_free_target_ib(target); | |
465 | scsi_host_put(target->scsi_host); | |
aef9ec39 RD |
466 | } |
467 | ||
468 | static int srp_connect_target(struct srp_target_port *target) | |
469 | { | |
9fe4bcf4 | 470 | int retries = 3; |
aef9ec39 RD |
471 | int ret; |
472 | ||
473 | ret = srp_lookup_path(target); | |
474 | if (ret) | |
475 | return ret; | |
476 | ||
477 | while (1) { | |
478 | init_completion(&target->done); | |
479 | ret = srp_send_req(target); | |
480 | if (ret) | |
481 | return ret; | |
482 | wait_for_completion(&target->done); | |
483 | ||
484 | /* | |
485 | * The CM event handling code will set status to | |
486 | * SRP_PORT_REDIRECT if we get a port redirect REJ | |
487 | * back, or SRP_DLID_REDIRECT if we get a lid/qp | |
488 | * redirect REJ back. | |
489 | */ | |
490 | switch (target->status) { | |
491 | case 0: | |
492 | return 0; | |
493 | ||
494 | case SRP_PORT_REDIRECT: | |
495 | ret = srp_lookup_path(target); | |
496 | if (ret) | |
497 | return ret; | |
498 | break; | |
499 | ||
500 | case SRP_DLID_REDIRECT: | |
501 | break; | |
502 | ||
9fe4bcf4 DD |
503 | case SRP_STALE_CONN: |
504 | /* Our current CM id was stale, and is now in timewait. | |
505 | * Try to reconnect with a new one. | |
506 | */ | |
507 | if (!retries-- || srp_new_cm_id(target)) { | |
508 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
509 | "giving up on stale connection\n"); | |
510 | target->status = -ECONNRESET; | |
511 | return target->status; | |
512 | } | |
513 | ||
514 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
515 | "retrying stale connection\n"); | |
516 | break; | |
517 | ||
aef9ec39 RD |
518 | default: |
519 | return target->status; | |
520 | } | |
521 | } | |
522 | } | |
523 | ||
d945e1df RD |
524 | static void srp_unmap_data(struct scsi_cmnd *scmnd, |
525 | struct srp_target_port *target, | |
526 | struct srp_request *req) | |
527 | { | |
bb350d1d | 528 | if (!scsi_sglist(scmnd) || |
d945e1df RD |
529 | (scmnd->sc_data_direction != DMA_TO_DEVICE && |
530 | scmnd->sc_data_direction != DMA_FROM_DEVICE)) | |
531 | return; | |
532 | ||
f5358a17 RD |
533 | if (req->fmr) { |
534 | ib_fmr_pool_unmap(req->fmr); | |
535 | req->fmr = NULL; | |
536 | } | |
537 | ||
05321937 | 538 | ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd), |
bb350d1d | 539 | scsi_sg_count(scmnd), scmnd->sc_data_direction); |
d945e1df RD |
540 | } |
541 | ||
526b4caa IR |
542 | static void srp_remove_req(struct srp_target_port *target, struct srp_request *req) |
543 | { | |
544 | srp_unmap_data(req->scmnd, target, req); | |
545 | list_move_tail(&req->list, &target->free_reqs); | |
546 | } | |
547 | ||
548 | static void srp_reset_req(struct srp_target_port *target, struct srp_request *req) | |
549 | { | |
550 | req->scmnd->result = DID_RESET << 16; | |
551 | req->scmnd->scsi_done(req->scmnd); | |
552 | srp_remove_req(target, req); | |
553 | } | |
554 | ||
aef9ec39 RD |
555 | static int srp_reconnect_target(struct srp_target_port *target) |
556 | { | |
aef9ec39 | 557 | struct ib_qp_attr qp_attr; |
526b4caa | 558 | struct srp_request *req, *tmp; |
aef9ec39 RD |
559 | struct ib_wc wc; |
560 | int ret; | |
aef9ec39 RD |
561 | |
562 | spin_lock_irq(target->scsi_host->host_lock); | |
563 | if (target->state != SRP_TARGET_LIVE) { | |
564 | spin_unlock_irq(target->scsi_host->host_lock); | |
565 | return -EAGAIN; | |
566 | } | |
567 | target->state = SRP_TARGET_CONNECTING; | |
568 | spin_unlock_irq(target->scsi_host->host_lock); | |
569 | ||
570 | srp_disconnect_target(target); | |
571 | /* | |
572 | * Now get a new local CM ID so that we avoid confusing the | |
573 | * target in case things are really fouled up. | |
574 | */ | |
9fe4bcf4 DD |
575 | ret = srp_new_cm_id(target); |
576 | if (ret) | |
aef9ec39 | 577 | goto err; |
aef9ec39 RD |
578 | |
579 | qp_attr.qp_state = IB_QPS_RESET; | |
580 | ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE); | |
581 | if (ret) | |
582 | goto err; | |
583 | ||
584 | ret = srp_init_qp(target, target->qp); | |
585 | if (ret) | |
586 | goto err; | |
587 | ||
9c03dc9f BVA |
588 | while (ib_poll_cq(target->recv_cq, 1, &wc) > 0) |
589 | ; /* nothing */ | |
590 | while (ib_poll_cq(target->send_cq, 1, &wc) > 0) | |
aef9ec39 RD |
591 | ; /* nothing */ |
592 | ||
d916a8f1 | 593 | spin_lock_irq(target->scsi_host->host_lock); |
526b4caa IR |
594 | list_for_each_entry_safe(req, tmp, &target->req_queue, list) |
595 | srp_reset_req(target, req); | |
d916a8f1 | 596 | spin_unlock_irq(target->scsi_host->host_lock); |
aef9ec39 RD |
597 | |
598 | target->rx_head = 0; | |
599 | target->tx_head = 0; | |
600 | target->tx_tail = 0; | |
aef9ec39 | 601 | |
1033ff67 | 602 | target->qp_in_error = 0; |
aef9ec39 RD |
603 | ret = srp_connect_target(target); |
604 | if (ret) | |
605 | goto err; | |
606 | ||
607 | spin_lock_irq(target->scsi_host->host_lock); | |
608 | if (target->state == SRP_TARGET_CONNECTING) { | |
609 | ret = 0; | |
610 | target->state = SRP_TARGET_LIVE; | |
611 | } else | |
612 | ret = -EAGAIN; | |
613 | spin_unlock_irq(target->scsi_host->host_lock); | |
614 | ||
615 | return ret; | |
616 | ||
617 | err: | |
7aa54bd7 DD |
618 | shost_printk(KERN_ERR, target->scsi_host, |
619 | PFX "reconnect failed (%d), removing target port.\n", ret); | |
aef9ec39 RD |
620 | |
621 | /* | |
622 | * We couldn't reconnect, so kill our target port off. | |
623 | * However, we have to defer the real removal because we might | |
624 | * be in the context of the SCSI error handler now, which | |
625 | * would deadlock if we call scsi_remove_host(). | |
626 | */ | |
627 | spin_lock_irq(target->scsi_host->host_lock); | |
628 | if (target->state == SRP_TARGET_CONNECTING) { | |
629 | target->state = SRP_TARGET_DEAD; | |
c4028958 | 630 | INIT_WORK(&target->work, srp_remove_work); |
aef9ec39 RD |
631 | schedule_work(&target->work); |
632 | } | |
633 | spin_unlock_irq(target->scsi_host->host_lock); | |
634 | ||
635 | return ret; | |
636 | } | |
637 | ||
559ce8f1 | 638 | static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat, |
f5358a17 RD |
639 | int sg_cnt, struct srp_request *req, |
640 | struct srp_direct_buf *buf) | |
641 | { | |
642 | u64 io_addr = 0; | |
643 | u64 *dma_pages; | |
644 | u32 len; | |
645 | int page_cnt; | |
646 | int i, j; | |
647 | int ret; | |
05321937 | 648 | struct srp_device *dev = target->srp_host->srp_dev; |
85507bcc | 649 | struct ib_device *ibdev = dev->dev; |
bb350d1d | 650 | struct scatterlist *sg; |
f5358a17 RD |
651 | |
652 | if (!dev->fmr_pool) | |
653 | return -ENODEV; | |
654 | ||
5d7cbfd6 RD |
655 | if (srp_target_is_mellanox(target) && |
656 | (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask)) | |
559ce8f1 IR |
657 | return -EINVAL; |
658 | ||
f5358a17 | 659 | len = page_cnt = 0; |
bb350d1d FT |
660 | scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) { |
661 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
85507bcc | 662 | |
bb350d1d | 663 | if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) { |
f5358a17 RD |
664 | if (i > 0) |
665 | return -EINVAL; | |
666 | else | |
667 | ++page_cnt; | |
668 | } | |
bb350d1d | 669 | if ((ib_sg_dma_address(ibdev, sg) + dma_len) & |
f5358a17 RD |
670 | ~dev->fmr_page_mask) { |
671 | if (i < sg_cnt - 1) | |
672 | return -EINVAL; | |
673 | else | |
674 | ++page_cnt; | |
675 | } | |
676 | ||
85507bcc | 677 | len += dma_len; |
f5358a17 RD |
678 | } |
679 | ||
680 | page_cnt += len >> dev->fmr_page_shift; | |
681 | if (page_cnt > SRP_FMR_SIZE) | |
682 | return -ENOMEM; | |
683 | ||
684 | dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC); | |
685 | if (!dma_pages) | |
686 | return -ENOMEM; | |
687 | ||
688 | page_cnt = 0; | |
bb350d1d FT |
689 | scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) { |
690 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
85507bcc RC |
691 | |
692 | for (j = 0; j < dma_len; j += dev->fmr_page_size) | |
f5358a17 | 693 | dma_pages[page_cnt++] = |
bb350d1d | 694 | (ib_sg_dma_address(ibdev, sg) & |
85507bcc RC |
695 | dev->fmr_page_mask) + j; |
696 | } | |
f5358a17 RD |
697 | |
698 | req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool, | |
adfaa888 | 699 | dma_pages, page_cnt, io_addr); |
f5358a17 RD |
700 | if (IS_ERR(req->fmr)) { |
701 | ret = PTR_ERR(req->fmr); | |
6583eb3d | 702 | req->fmr = NULL; |
f5358a17 RD |
703 | goto out; |
704 | } | |
705 | ||
85507bcc RC |
706 | buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) & |
707 | ~dev->fmr_page_mask); | |
f5358a17 RD |
708 | buf->key = cpu_to_be32(req->fmr->fmr->rkey); |
709 | buf->len = cpu_to_be32(len); | |
710 | ||
711 | ret = 0; | |
712 | ||
713 | out: | |
714 | kfree(dma_pages); | |
715 | ||
716 | return ret; | |
717 | } | |
718 | ||
aef9ec39 RD |
719 | static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, |
720 | struct srp_request *req) | |
721 | { | |
cf368713 | 722 | struct scatterlist *scat; |
aef9ec39 | 723 | struct srp_cmd *cmd = req->cmd->buf; |
cf368713 | 724 | int len, nents, count; |
f5358a17 | 725 | u8 fmt = SRP_DATA_DESC_DIRECT; |
85507bcc RC |
726 | struct srp_device *dev; |
727 | struct ib_device *ibdev; | |
aef9ec39 | 728 | |
bb350d1d | 729 | if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE) |
aef9ec39 RD |
730 | return sizeof (struct srp_cmd); |
731 | ||
732 | if (scmnd->sc_data_direction != DMA_FROM_DEVICE && | |
733 | scmnd->sc_data_direction != DMA_TO_DEVICE) { | |
7aa54bd7 DD |
734 | shost_printk(KERN_WARNING, target->scsi_host, |
735 | PFX "Unhandled data direction %d\n", | |
736 | scmnd->sc_data_direction); | |
aef9ec39 RD |
737 | return -EINVAL; |
738 | } | |
739 | ||
bb350d1d FT |
740 | nents = scsi_sg_count(scmnd); |
741 | scat = scsi_sglist(scmnd); | |
aef9ec39 | 742 | |
05321937 | 743 | dev = target->srp_host->srp_dev; |
85507bcc RC |
744 | ibdev = dev->dev; |
745 | ||
746 | count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); | |
f5358a17 RD |
747 | |
748 | fmt = SRP_DATA_DESC_DIRECT; | |
749 | len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); | |
aef9ec39 | 750 | |
cf368713 | 751 | if (count == 1) { |
f5358a17 RD |
752 | /* |
753 | * The midlayer only generated a single gather/scatter | |
754 | * entry, or DMA mapping coalesced everything to a | |
755 | * single entry. So a direct descriptor along with | |
756 | * the DMA MR suffices. | |
757 | */ | |
cf368713 | 758 | struct srp_direct_buf *buf = (void *) cmd->add_data; |
aef9ec39 | 759 | |
85507bcc RC |
760 | buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); |
761 | buf->key = cpu_to_be32(dev->mr->rkey); | |
762 | buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); | |
559ce8f1 | 763 | } else if (srp_map_fmr(target, scat, count, req, |
f5358a17 RD |
764 | (void *) cmd->add_data)) { |
765 | /* | |
766 | * FMR mapping failed, and the scatterlist has more | |
767 | * than one entry. Generate an indirect memory | |
768 | * descriptor. | |
769 | */ | |
cf368713 | 770 | struct srp_indirect_buf *buf = (void *) cmd->add_data; |
bb350d1d | 771 | struct scatterlist *sg; |
cf368713 | 772 | u32 datalen = 0; |
f5358a17 | 773 | int i; |
aef9ec39 | 774 | |
cf368713 | 775 | fmt = SRP_DATA_DESC_INDIRECT; |
f5358a17 RD |
776 | len = sizeof (struct srp_cmd) + |
777 | sizeof (struct srp_indirect_buf) + | |
778 | count * sizeof (struct srp_direct_buf); | |
779 | ||
bb350d1d FT |
780 | scsi_for_each_sg(scmnd, sg, count, i) { |
781 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
85507bcc | 782 | |
f5358a17 | 783 | buf->desc_list[i].va = |
bb350d1d | 784 | cpu_to_be64(ib_sg_dma_address(ibdev, sg)); |
f5358a17 | 785 | buf->desc_list[i].key = |
85507bcc RC |
786 | cpu_to_be32(dev->mr->rkey); |
787 | buf->desc_list[i].len = cpu_to_be32(dma_len); | |
788 | datalen += dma_len; | |
f5358a17 | 789 | } |
aef9ec39 | 790 | |
cf368713 RD |
791 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) |
792 | cmd->data_out_desc_cnt = count; | |
793 | else | |
794 | cmd->data_in_desc_cnt = count; | |
795 | ||
f5358a17 RD |
796 | buf->table_desc.va = |
797 | cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf); | |
cf368713 | 798 | buf->table_desc.key = |
05321937 | 799 | cpu_to_be32(target->srp_host->srp_dev->mr->rkey); |
cf368713 RD |
800 | buf->table_desc.len = |
801 | cpu_to_be32(count * sizeof (struct srp_direct_buf)); | |
802 | ||
cf368713 | 803 | buf->len = cpu_to_be32(datalen); |
aef9ec39 RD |
804 | } |
805 | ||
806 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) | |
807 | cmd->buf_fmt = fmt << 4; | |
808 | else | |
809 | cmd->buf_fmt = fmt; | |
810 | ||
aef9ec39 RD |
811 | return len; |
812 | } | |
813 | ||
05a1d750 DD |
814 | /* |
815 | * Must be called with target->scsi_host->host_lock held to protect | |
816 | * req_lim and tx_head. Lock cannot be dropped between call here and | |
817 | * call to __srp_post_send(). | |
818 | * | |
819 | * Note: | |
820 | * An upper limit for the number of allocated information units for each | |
821 | * request type is: | |
822 | * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues | |
823 | * more than Scsi_Host.can_queue requests. | |
824 | * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE. | |
825 | * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than | |
826 | * one unanswered SRP request to an initiator. | |
827 | */ | |
828 | static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target, | |
829 | enum srp_iu_type iu_type) | |
830 | { | |
831 | s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE; | |
832 | struct srp_iu *iu; | |
833 | ||
834 | srp_send_completion(target->send_cq, target); | |
835 | ||
836 | if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE) | |
837 | return NULL; | |
838 | ||
839 | /* Initiator responses to target requests do not consume credits */ | |
840 | if (target->req_lim <= rsv && iu_type != SRP_IU_RSP) { | |
841 | ++target->zero_req_lim; | |
842 | return NULL; | |
843 | } | |
844 | ||
845 | iu = target->tx_ring[target->tx_head & SRP_SQ_MASK]; | |
846 | iu->type = iu_type; | |
847 | return iu; | |
848 | } | |
849 | ||
850 | /* | |
851 | * Must be called with target->scsi_host->host_lock held to protect | |
852 | * req_lim and tx_head. | |
853 | */ | |
854 | static int __srp_post_send(struct srp_target_port *target, | |
855 | struct srp_iu *iu, int len) | |
856 | { | |
857 | struct ib_sge list; | |
858 | struct ib_send_wr wr, *bad_wr; | |
859 | int ret = 0; | |
860 | ||
861 | list.addr = iu->dma; | |
862 | list.length = len; | |
863 | list.lkey = target->srp_host->srp_dev->mr->lkey; | |
864 | ||
865 | wr.next = NULL; | |
866 | wr.wr_id = target->tx_head & SRP_SQ_MASK; | |
867 | wr.sg_list = &list; | |
868 | wr.num_sge = 1; | |
869 | wr.opcode = IB_WR_SEND; | |
870 | wr.send_flags = IB_SEND_SIGNALED; | |
871 | ||
872 | ret = ib_post_send(target->qp, &wr, &bad_wr); | |
873 | ||
874 | if (!ret) { | |
875 | ++target->tx_head; | |
876 | if (iu->type != SRP_IU_RSP) | |
877 | --target->req_lim; | |
878 | } | |
879 | ||
880 | return ret; | |
881 | } | |
882 | ||
c996bb47 BVA |
883 | static int srp_post_recv(struct srp_target_port *target) |
884 | { | |
885 | unsigned long flags; | |
886 | struct srp_iu *iu; | |
887 | struct ib_sge list; | |
888 | struct ib_recv_wr wr, *bad_wr; | |
889 | unsigned int next; | |
890 | int ret; | |
891 | ||
892 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
893 | ||
dd5e6e38 | 894 | next = target->rx_head & SRP_RQ_MASK; |
c996bb47 BVA |
895 | wr.wr_id = next; |
896 | iu = target->rx_ring[next]; | |
897 | ||
898 | list.addr = iu->dma; | |
899 | list.length = iu->size; | |
900 | list.lkey = target->srp_host->srp_dev->mr->lkey; | |
901 | ||
902 | wr.next = NULL; | |
903 | wr.sg_list = &list; | |
904 | wr.num_sge = 1; | |
905 | ||
906 | ret = ib_post_recv(target->qp, &wr, &bad_wr); | |
907 | if (!ret) | |
908 | ++target->rx_head; | |
909 | ||
910 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
911 | ||
912 | return ret; | |
913 | } | |
914 | ||
aef9ec39 RD |
915 | static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) |
916 | { | |
917 | struct srp_request *req; | |
918 | struct scsi_cmnd *scmnd; | |
919 | unsigned long flags; | |
920 | s32 delta; | |
921 | ||
922 | delta = (s32) be32_to_cpu(rsp->req_lim_delta); | |
923 | ||
924 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
925 | ||
926 | target->req_lim += delta; | |
927 | ||
928 | req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT]; | |
929 | ||
930 | if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { | |
931 | if (be32_to_cpu(rsp->resp_data_len) < 4) | |
932 | req->tsk_status = -1; | |
933 | else | |
934 | req->tsk_status = rsp->data[3]; | |
935 | complete(&req->done); | |
936 | } else { | |
d945e1df | 937 | scmnd = req->scmnd; |
aef9ec39 | 938 | if (!scmnd) |
7aa54bd7 DD |
939 | shost_printk(KERN_ERR, target->scsi_host, |
940 | "Null scmnd for RSP w/tag %016llx\n", | |
941 | (unsigned long long) rsp->tag); | |
aef9ec39 RD |
942 | scmnd->result = rsp->status; |
943 | ||
944 | if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { | |
945 | memcpy(scmnd->sense_buffer, rsp->data + | |
946 | be32_to_cpu(rsp->resp_data_len), | |
947 | min_t(int, be32_to_cpu(rsp->sense_data_len), | |
948 | SCSI_SENSE_BUFFERSIZE)); | |
949 | } | |
950 | ||
951 | if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) | |
bb350d1d | 952 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); |
aef9ec39 | 953 | else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) |
bb350d1d | 954 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
aef9ec39 | 955 | |
aef9ec39 | 956 | if (!req->tsk_mgmt) { |
aef9ec39 RD |
957 | scmnd->host_scribble = (void *) -1L; |
958 | scmnd->scsi_done(scmnd); | |
959 | ||
d945e1df | 960 | srp_remove_req(target, req); |
aef9ec39 RD |
961 | } else |
962 | req->cmd_done = 1; | |
963 | } | |
964 | ||
965 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
966 | } | |
967 | ||
bb12588a DD |
968 | static int srp_response_common(struct srp_target_port *target, s32 req_delta, |
969 | void *rsp, int len) | |
970 | { | |
971 | struct ib_device *dev; | |
972 | unsigned long flags; | |
973 | struct srp_iu *iu; | |
974 | int err = 1; | |
975 | ||
976 | dev = target->srp_host->srp_dev->dev; | |
977 | ||
978 | spin_lock_irqsave(target->scsi_host->host_lock, flags); | |
979 | target->req_lim += req_delta; | |
980 | ||
981 | iu = __srp_get_tx_iu(target, SRP_IU_RSP); | |
982 | if (!iu) { | |
983 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
984 | "no IU available to send response\n"); | |
985 | goto out; | |
986 | } | |
987 | ||
988 | ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE); | |
989 | memcpy(iu->buf, rsp, len); | |
990 | ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE); | |
991 | ||
992 | err = __srp_post_send(target, iu, len); | |
993 | if (err) | |
994 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
995 | "unable to post response: %d\n", err); | |
996 | ||
997 | out: | |
998 | spin_unlock_irqrestore(target->scsi_host->host_lock, flags); | |
999 | return err; | |
1000 | } | |
1001 | ||
1002 | static void srp_process_cred_req(struct srp_target_port *target, | |
1003 | struct srp_cred_req *req) | |
1004 | { | |
1005 | struct srp_cred_rsp rsp = { | |
1006 | .opcode = SRP_CRED_RSP, | |
1007 | .tag = req->tag, | |
1008 | }; | |
1009 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
1010 | ||
1011 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1012 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1013 | "problems processing SRP_CRED_REQ\n"); | |
1014 | } | |
1015 | ||
1016 | static void srp_process_aer_req(struct srp_target_port *target, | |
1017 | struct srp_aer_req *req) | |
1018 | { | |
1019 | struct srp_aer_rsp rsp = { | |
1020 | .opcode = SRP_AER_RSP, | |
1021 | .tag = req->tag, | |
1022 | }; | |
1023 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
1024 | ||
1025 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1026 | "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun)); | |
1027 | ||
1028 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1029 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1030 | "problems processing SRP_AER_REQ\n"); | |
1031 | } | |
1032 | ||
aef9ec39 RD |
1033 | static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) |
1034 | { | |
85507bcc | 1035 | struct ib_device *dev; |
aef9ec39 | 1036 | struct srp_iu *iu; |
c996bb47 | 1037 | int res; |
aef9ec39 RD |
1038 | u8 opcode; |
1039 | ||
9c03dc9f | 1040 | iu = target->rx_ring[wc->wr_id]; |
aef9ec39 | 1041 | |
05321937 | 1042 | dev = target->srp_host->srp_dev->dev; |
85507bcc RC |
1043 | ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, |
1044 | DMA_FROM_DEVICE); | |
aef9ec39 RD |
1045 | |
1046 | opcode = *(u8 *) iu->buf; | |
1047 | ||
1048 | if (0) { | |
7aa54bd7 DD |
1049 | shost_printk(KERN_ERR, target->scsi_host, |
1050 | PFX "recv completion, opcode 0x%02x\n", opcode); | |
7a700811 BVA |
1051 | print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1, |
1052 | iu->buf, wc->byte_len, true); | |
aef9ec39 RD |
1053 | } |
1054 | ||
1055 | switch (opcode) { | |
1056 | case SRP_RSP: | |
1057 | srp_process_rsp(target, iu->buf); | |
1058 | break; | |
1059 | ||
bb12588a DD |
1060 | case SRP_CRED_REQ: |
1061 | srp_process_cred_req(target, iu->buf); | |
1062 | break; | |
1063 | ||
1064 | case SRP_AER_REQ: | |
1065 | srp_process_aer_req(target, iu->buf); | |
1066 | break; | |
1067 | ||
aef9ec39 RD |
1068 | case SRP_T_LOGOUT: |
1069 | /* XXX Handle target logout */ | |
7aa54bd7 DD |
1070 | shost_printk(KERN_WARNING, target->scsi_host, |
1071 | PFX "Got target logout request\n"); | |
aef9ec39 RD |
1072 | break; |
1073 | ||
1074 | default: | |
7aa54bd7 DD |
1075 | shost_printk(KERN_WARNING, target->scsi_host, |
1076 | PFX "Unhandled SRP opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1077 | break; |
1078 | } | |
1079 | ||
85507bcc RC |
1080 | ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, |
1081 | DMA_FROM_DEVICE); | |
c996bb47 BVA |
1082 | |
1083 | res = srp_post_recv(target); | |
1084 | if (res != 0) | |
1085 | shost_printk(KERN_ERR, target->scsi_host, | |
1086 | PFX "Recv failed with error code %d\n", res); | |
aef9ec39 RD |
1087 | } |
1088 | ||
9c03dc9f | 1089 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr) |
aef9ec39 RD |
1090 | { |
1091 | struct srp_target_port *target = target_ptr; | |
1092 | struct ib_wc wc; | |
aef9ec39 RD |
1093 | |
1094 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
1095 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
1096 | if (wc.status) { | |
7aa54bd7 | 1097 | shost_printk(KERN_ERR, target->scsi_host, |
9c03dc9f | 1098 | PFX "failed receive status %d\n", |
7aa54bd7 | 1099 | wc.status); |
1033ff67 | 1100 | target->qp_in_error = 1; |
aef9ec39 RD |
1101 | break; |
1102 | } | |
1103 | ||
9c03dc9f BVA |
1104 | srp_handle_recv(target, &wc); |
1105 | } | |
1106 | } | |
1107 | ||
1108 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr) | |
1109 | { | |
1110 | struct srp_target_port *target = target_ptr; | |
1111 | struct ib_wc wc; | |
1112 | ||
1113 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
1114 | if (wc.status) { | |
1115 | shost_printk(KERN_ERR, target->scsi_host, | |
1116 | PFX "failed send status %d\n", | |
1117 | wc.status); | |
1118 | target->qp_in_error = 1; | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | ++target->tx_tail; | |
aef9ec39 RD |
1123 | } |
1124 | } | |
1125 | ||
f281233d | 1126 | static int srp_queuecommand_lck(struct scsi_cmnd *scmnd, |
aef9ec39 RD |
1127 | void (*done)(struct scsi_cmnd *)) |
1128 | { | |
1129 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
1130 | struct srp_request *req; | |
1131 | struct srp_iu *iu; | |
1132 | struct srp_cmd *cmd; | |
85507bcc | 1133 | struct ib_device *dev; |
aef9ec39 RD |
1134 | int len; |
1135 | ||
1136 | if (target->state == SRP_TARGET_CONNECTING) | |
1137 | goto err; | |
1138 | ||
1139 | if (target->state == SRP_TARGET_DEAD || | |
1140 | target->state == SRP_TARGET_REMOVED) { | |
1141 | scmnd->result = DID_BAD_TARGET << 16; | |
1142 | done(scmnd); | |
1143 | return 0; | |
1144 | } | |
1145 | ||
bb12588a | 1146 | iu = __srp_get_tx_iu(target, SRP_IU_CMD); |
aef9ec39 RD |
1147 | if (!iu) |
1148 | goto err; | |
1149 | ||
05321937 | 1150 | dev = target->srp_host->srp_dev->dev; |
85507bcc RC |
1151 | ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len, |
1152 | DMA_TO_DEVICE); | |
aef9ec39 | 1153 | |
21c1a907 | 1154 | req = list_first_entry(&target->free_reqs, struct srp_request, list); |
aef9ec39 RD |
1155 | |
1156 | scmnd->scsi_done = done; | |
1157 | scmnd->result = 0; | |
d945e1df | 1158 | scmnd->host_scribble = (void *) (long) req->index; |
aef9ec39 RD |
1159 | |
1160 | cmd = iu->buf; | |
1161 | memset(cmd, 0, sizeof *cmd); | |
1162 | ||
1163 | cmd->opcode = SRP_CMD; | |
1164 | cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); | |
d945e1df | 1165 | cmd->tag = req->index; |
aef9ec39 RD |
1166 | memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); |
1167 | ||
aef9ec39 RD |
1168 | req->scmnd = scmnd; |
1169 | req->cmd = iu; | |
1170 | req->cmd_done = 0; | |
1171 | req->tsk_mgmt = NULL; | |
1172 | ||
1173 | len = srp_map_data(scmnd, target, req); | |
1174 | if (len < 0) { | |
7aa54bd7 DD |
1175 | shost_printk(KERN_ERR, target->scsi_host, |
1176 | PFX "Failed to map data\n"); | |
aef9ec39 RD |
1177 | goto err; |
1178 | } | |
1179 | ||
85507bcc RC |
1180 | ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len, |
1181 | DMA_TO_DEVICE); | |
aef9ec39 RD |
1182 | |
1183 | if (__srp_post_send(target, iu, len)) { | |
7aa54bd7 | 1184 | shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n"); |
aef9ec39 RD |
1185 | goto err_unmap; |
1186 | } | |
1187 | ||
d945e1df | 1188 | list_move_tail(&req->list, &target->req_queue); |
aef9ec39 RD |
1189 | |
1190 | return 0; | |
1191 | ||
1192 | err_unmap: | |
1193 | srp_unmap_data(scmnd, target, req); | |
1194 | ||
1195 | err: | |
1196 | return SCSI_MLQUEUE_HOST_BUSY; | |
1197 | } | |
1198 | ||
f281233d JG |
1199 | static DEF_SCSI_QCMD(srp_queuecommand) |
1200 | ||
aef9ec39 RD |
1201 | static int srp_alloc_iu_bufs(struct srp_target_port *target) |
1202 | { | |
1203 | int i; | |
1204 | ||
1205 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1206 | target->rx_ring[i] = srp_alloc_iu(target->srp_host, | |
1207 | target->max_ti_iu_len, | |
1208 | GFP_KERNEL, DMA_FROM_DEVICE); | |
1209 | if (!target->rx_ring[i]) | |
1210 | goto err; | |
1211 | } | |
1212 | ||
dd5e6e38 | 1213 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
aef9ec39 | 1214 | target->tx_ring[i] = srp_alloc_iu(target->srp_host, |
74b0a15b | 1215 | srp_max_iu_len, |
aef9ec39 RD |
1216 | GFP_KERNEL, DMA_TO_DEVICE); |
1217 | if (!target->tx_ring[i]) | |
1218 | goto err; | |
1219 | } | |
1220 | ||
1221 | return 0; | |
1222 | ||
1223 | err: | |
1224 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1225 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
1226 | target->rx_ring[i] = NULL; | |
1227 | } | |
1228 | ||
dd5e6e38 | 1229 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
aef9ec39 RD |
1230 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
1231 | target->tx_ring[i] = NULL; | |
1232 | } | |
1233 | ||
1234 | return -ENOMEM; | |
1235 | } | |
1236 | ||
1237 | static void srp_cm_rej_handler(struct ib_cm_id *cm_id, | |
1238 | struct ib_cm_event *event, | |
1239 | struct srp_target_port *target) | |
1240 | { | |
7aa54bd7 | 1241 | struct Scsi_Host *shost = target->scsi_host; |
aef9ec39 RD |
1242 | struct ib_class_port_info *cpi; |
1243 | int opcode; | |
1244 | ||
1245 | switch (event->param.rej_rcvd.reason) { | |
1246 | case IB_CM_REJ_PORT_CM_REDIRECT: | |
1247 | cpi = event->param.rej_rcvd.ari; | |
1248 | target->path.dlid = cpi->redirect_lid; | |
1249 | target->path.pkey = cpi->redirect_pkey; | |
1250 | cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; | |
1251 | memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); | |
1252 | ||
1253 | target->status = target->path.dlid ? | |
1254 | SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; | |
1255 | break; | |
1256 | ||
1257 | case IB_CM_REJ_PORT_REDIRECT: | |
5d7cbfd6 | 1258 | if (srp_target_is_topspin(target)) { |
aef9ec39 RD |
1259 | /* |
1260 | * Topspin/Cisco SRP gateways incorrectly send | |
1261 | * reject reason code 25 when they mean 24 | |
1262 | * (port redirect). | |
1263 | */ | |
1264 | memcpy(target->path.dgid.raw, | |
1265 | event->param.rej_rcvd.ari, 16); | |
1266 | ||
7aa54bd7 DD |
1267 | shost_printk(KERN_DEBUG, shost, |
1268 | PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", | |
1269 | (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), | |
1270 | (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); | |
aef9ec39 RD |
1271 | |
1272 | target->status = SRP_PORT_REDIRECT; | |
1273 | } else { | |
7aa54bd7 DD |
1274 | shost_printk(KERN_WARNING, shost, |
1275 | " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); | |
aef9ec39 RD |
1276 | target->status = -ECONNRESET; |
1277 | } | |
1278 | break; | |
1279 | ||
1280 | case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: | |
7aa54bd7 DD |
1281 | shost_printk(KERN_WARNING, shost, |
1282 | " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); | |
aef9ec39 RD |
1283 | target->status = -ECONNRESET; |
1284 | break; | |
1285 | ||
1286 | case IB_CM_REJ_CONSUMER_DEFINED: | |
1287 | opcode = *(u8 *) event->private_data; | |
1288 | if (opcode == SRP_LOGIN_REJ) { | |
1289 | struct srp_login_rej *rej = event->private_data; | |
1290 | u32 reason = be32_to_cpu(rej->reason); | |
1291 | ||
1292 | if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) | |
7aa54bd7 DD |
1293 | shost_printk(KERN_WARNING, shost, |
1294 | PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); | |
aef9ec39 | 1295 | else |
7aa54bd7 DD |
1296 | shost_printk(KERN_WARNING, shost, |
1297 | PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason); | |
aef9ec39 | 1298 | } else |
7aa54bd7 DD |
1299 | shost_printk(KERN_WARNING, shost, |
1300 | " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," | |
1301 | " opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1302 | target->status = -ECONNRESET; |
1303 | break; | |
1304 | ||
9fe4bcf4 DD |
1305 | case IB_CM_REJ_STALE_CONN: |
1306 | shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n"); | |
1307 | target->status = SRP_STALE_CONN; | |
1308 | break; | |
1309 | ||
aef9ec39 | 1310 | default: |
7aa54bd7 DD |
1311 | shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n", |
1312 | event->param.rej_rcvd.reason); | |
aef9ec39 RD |
1313 | target->status = -ECONNRESET; |
1314 | } | |
1315 | } | |
1316 | ||
1317 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
1318 | { | |
1319 | struct srp_target_port *target = cm_id->context; | |
1320 | struct ib_qp_attr *qp_attr = NULL; | |
1321 | int attr_mask = 0; | |
1322 | int comp = 0; | |
1323 | int opcode = 0; | |
c996bb47 | 1324 | int i; |
aef9ec39 RD |
1325 | |
1326 | switch (event->event) { | |
1327 | case IB_CM_REQ_ERROR: | |
7aa54bd7 DD |
1328 | shost_printk(KERN_DEBUG, target->scsi_host, |
1329 | PFX "Sending CM REQ failed\n"); | |
aef9ec39 RD |
1330 | comp = 1; |
1331 | target->status = -ECONNRESET; | |
1332 | break; | |
1333 | ||
1334 | case IB_CM_REP_RECEIVED: | |
1335 | comp = 1; | |
1336 | opcode = *(u8 *) event->private_data; | |
1337 | ||
1338 | if (opcode == SRP_LOGIN_RSP) { | |
1339 | struct srp_login_rsp *rsp = event->private_data; | |
1340 | ||
1341 | target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len); | |
1342 | target->req_lim = be32_to_cpu(rsp->req_lim_delta); | |
1343 | ||
7ade400a BVA |
1344 | /* |
1345 | * Reserve credits for task management so we don't | |
1346 | * bounce requests back to the SCSI mid-layer. | |
1347 | */ | |
1348 | target->scsi_host->can_queue | |
1349 | = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE, | |
1350 | target->scsi_host->can_queue); | |
aef9ec39 | 1351 | } else { |
7aa54bd7 DD |
1352 | shost_printk(KERN_WARNING, target->scsi_host, |
1353 | PFX "Unhandled RSP opcode %#x\n", opcode); | |
aef9ec39 RD |
1354 | target->status = -ECONNRESET; |
1355 | break; | |
1356 | } | |
1357 | ||
d2fcea7d VP |
1358 | if (!target->rx_ring[0]) { |
1359 | target->status = srp_alloc_iu_bufs(target); | |
1360 | if (target->status) | |
1361 | break; | |
1362 | } | |
aef9ec39 RD |
1363 | |
1364 | qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); | |
1365 | if (!qp_attr) { | |
1366 | target->status = -ENOMEM; | |
1367 | break; | |
1368 | } | |
1369 | ||
1370 | qp_attr->qp_state = IB_QPS_RTR; | |
1371 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1372 | if (target->status) | |
1373 | break; | |
1374 | ||
1375 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1376 | if (target->status) | |
1377 | break; | |
1378 | ||
c996bb47 BVA |
1379 | for (i = 0; i < SRP_RQ_SIZE; i++) { |
1380 | target->status = srp_post_recv(target); | |
1381 | if (target->status) | |
1382 | break; | |
1383 | } | |
aef9ec39 RD |
1384 | if (target->status) |
1385 | break; | |
1386 | ||
1387 | qp_attr->qp_state = IB_QPS_RTS; | |
1388 | target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1389 | if (target->status) | |
1390 | break; | |
1391 | ||
1392 | target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1393 | if (target->status) | |
1394 | break; | |
1395 | ||
1396 | target->status = ib_send_cm_rtu(cm_id, NULL, 0); | |
1397 | if (target->status) | |
1398 | break; | |
1399 | ||
1400 | break; | |
1401 | ||
1402 | case IB_CM_REJ_RECEIVED: | |
7aa54bd7 | 1403 | shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n"); |
aef9ec39 RD |
1404 | comp = 1; |
1405 | ||
1406 | srp_cm_rej_handler(cm_id, event, target); | |
1407 | break; | |
1408 | ||
b7ac4ab4 | 1409 | case IB_CM_DREQ_RECEIVED: |
7aa54bd7 DD |
1410 | shost_printk(KERN_WARNING, target->scsi_host, |
1411 | PFX "DREQ received - connection closed\n"); | |
b7ac4ab4 | 1412 | if (ib_send_cm_drep(cm_id, NULL, 0)) |
7aa54bd7 DD |
1413 | shost_printk(KERN_ERR, target->scsi_host, |
1414 | PFX "Sending CM DREP failed\n"); | |
aef9ec39 RD |
1415 | break; |
1416 | ||
1417 | case IB_CM_TIMEWAIT_EXIT: | |
7aa54bd7 DD |
1418 | shost_printk(KERN_ERR, target->scsi_host, |
1419 | PFX "connection closed\n"); | |
aef9ec39 RD |
1420 | |
1421 | comp = 1; | |
1422 | target->status = 0; | |
1423 | break; | |
1424 | ||
b7ac4ab4 IR |
1425 | case IB_CM_MRA_RECEIVED: |
1426 | case IB_CM_DREQ_ERROR: | |
1427 | case IB_CM_DREP_RECEIVED: | |
1428 | break; | |
1429 | ||
aef9ec39 | 1430 | default: |
7aa54bd7 DD |
1431 | shost_printk(KERN_WARNING, target->scsi_host, |
1432 | PFX "Unhandled CM event %d\n", event->event); | |
aef9ec39 RD |
1433 | break; |
1434 | } | |
1435 | ||
1436 | if (comp) | |
1437 | complete(&target->done); | |
1438 | ||
1439 | kfree(qp_attr); | |
1440 | ||
1441 | return 0; | |
1442 | } | |
1443 | ||
d945e1df RD |
1444 | static int srp_send_tsk_mgmt(struct srp_target_port *target, |
1445 | struct srp_request *req, u8 func) | |
aef9ec39 | 1446 | { |
19081f31 | 1447 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
aef9ec39 RD |
1448 | struct srp_iu *iu; |
1449 | struct srp_tsk_mgmt *tsk_mgmt; | |
aef9ec39 RD |
1450 | |
1451 | spin_lock_irq(target->scsi_host->host_lock); | |
1452 | ||
1285b3a0 RD |
1453 | if (target->state == SRP_TARGET_DEAD || |
1454 | target->state == SRP_TARGET_REMOVED) { | |
d945e1df | 1455 | req->scmnd->result = DID_BAD_TARGET << 16; |
1285b3a0 RD |
1456 | goto out; |
1457 | } | |
1458 | ||
aef9ec39 RD |
1459 | init_completion(&req->done); |
1460 | ||
bb12588a | 1461 | iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT); |
aef9ec39 RD |
1462 | if (!iu) |
1463 | goto out; | |
1464 | ||
19081f31 DD |
1465 | ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt, |
1466 | DMA_TO_DEVICE); | |
aef9ec39 RD |
1467 | tsk_mgmt = iu->buf; |
1468 | memset(tsk_mgmt, 0, sizeof *tsk_mgmt); | |
1469 | ||
1470 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
d945e1df RD |
1471 | tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48); |
1472 | tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT; | |
aef9ec39 | 1473 | tsk_mgmt->tsk_mgmt_func = func; |
d945e1df | 1474 | tsk_mgmt->task_tag = req->index; |
aef9ec39 | 1475 | |
19081f31 DD |
1476 | ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt, |
1477 | DMA_TO_DEVICE); | |
aef9ec39 RD |
1478 | if (__srp_post_send(target, iu, sizeof *tsk_mgmt)) |
1479 | goto out; | |
1480 | ||
1481 | req->tsk_mgmt = iu; | |
1482 | ||
1483 | spin_unlock_irq(target->scsi_host->host_lock); | |
d945e1df | 1484 | |
aef9ec39 RD |
1485 | if (!wait_for_completion_timeout(&req->done, |
1486 | msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) | |
d945e1df | 1487 | return -1; |
aef9ec39 | 1488 | |
d945e1df | 1489 | return 0; |
aef9ec39 RD |
1490 | |
1491 | out: | |
1492 | spin_unlock_irq(target->scsi_host->host_lock); | |
d945e1df RD |
1493 | return -1; |
1494 | } | |
1495 | ||
1496 | static int srp_find_req(struct srp_target_port *target, | |
1497 | struct scsi_cmnd *scmnd, | |
1498 | struct srp_request **req) | |
1499 | { | |
1500 | if (scmnd->host_scribble == (void *) -1L) | |
1501 | return -1; | |
1502 | ||
1503 | *req = &target->req_ring[(long) scmnd->host_scribble]; | |
1504 | ||
1505 | return 0; | |
aef9ec39 RD |
1506 | } |
1507 | ||
1508 | static int srp_abort(struct scsi_cmnd *scmnd) | |
1509 | { | |
d945e1df RD |
1510 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
1511 | struct srp_request *req; | |
1512 | int ret = SUCCESS; | |
1513 | ||
7aa54bd7 | 1514 | shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n"); |
aef9ec39 | 1515 | |
1033ff67 IR |
1516 | if (target->qp_in_error) |
1517 | return FAILED; | |
d945e1df RD |
1518 | if (srp_find_req(target, scmnd, &req)) |
1519 | return FAILED; | |
1520 | if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK)) | |
1521 | return FAILED; | |
1522 | ||
1523 | spin_lock_irq(target->scsi_host->host_lock); | |
1524 | ||
1525 | if (req->cmd_done) { | |
1526 | srp_remove_req(target, req); | |
1527 | scmnd->scsi_done(scmnd); | |
1528 | } else if (!req->tsk_status) { | |
1529 | srp_remove_req(target, req); | |
1530 | scmnd->result = DID_ABORT << 16; | |
1531 | } else | |
1532 | ret = FAILED; | |
1533 | ||
1534 | spin_unlock_irq(target->scsi_host->host_lock); | |
1535 | ||
1536 | return ret; | |
aef9ec39 RD |
1537 | } |
1538 | ||
1539 | static int srp_reset_device(struct scsi_cmnd *scmnd) | |
1540 | { | |
d945e1df RD |
1541 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
1542 | struct srp_request *req, *tmp; | |
1543 | ||
7aa54bd7 | 1544 | shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n"); |
aef9ec39 | 1545 | |
1033ff67 IR |
1546 | if (target->qp_in_error) |
1547 | return FAILED; | |
d945e1df RD |
1548 | if (srp_find_req(target, scmnd, &req)) |
1549 | return FAILED; | |
1550 | if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET)) | |
1551 | return FAILED; | |
1552 | if (req->tsk_status) | |
1553 | return FAILED; | |
1554 | ||
1555 | spin_lock_irq(target->scsi_host->host_lock); | |
1556 | ||
1557 | list_for_each_entry_safe(req, tmp, &target->req_queue, list) | |
526b4caa IR |
1558 | if (req->scmnd->device == scmnd->device) |
1559 | srp_reset_req(target, req); | |
d945e1df RD |
1560 | |
1561 | spin_unlock_irq(target->scsi_host->host_lock); | |
1562 | ||
1563 | return SUCCESS; | |
aef9ec39 RD |
1564 | } |
1565 | ||
1566 | static int srp_reset_host(struct scsi_cmnd *scmnd) | |
1567 | { | |
1568 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
1569 | int ret = FAILED; | |
1570 | ||
7aa54bd7 | 1571 | shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n"); |
aef9ec39 RD |
1572 | |
1573 | if (!srp_reconnect_target(target)) | |
1574 | ret = SUCCESS; | |
1575 | ||
1576 | return ret; | |
1577 | } | |
1578 | ||
ee959b00 TJ |
1579 | static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr, |
1580 | char *buf) | |
6ecb0c84 | 1581 | { |
ee959b00 | 1582 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1583 | |
1584 | if (target->state == SRP_TARGET_DEAD || | |
1585 | target->state == SRP_TARGET_REMOVED) | |
1586 | return -ENODEV; | |
1587 | ||
1588 | return sprintf(buf, "0x%016llx\n", | |
1589 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1590 | } | |
1591 | ||
ee959b00 TJ |
1592 | static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr, |
1593 | char *buf) | |
6ecb0c84 | 1594 | { |
ee959b00 | 1595 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1596 | |
1597 | if (target->state == SRP_TARGET_DEAD || | |
1598 | target->state == SRP_TARGET_REMOVED) | |
1599 | return -ENODEV; | |
1600 | ||
1601 | return sprintf(buf, "0x%016llx\n", | |
1602 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
1603 | } | |
1604 | ||
ee959b00 TJ |
1605 | static ssize_t show_service_id(struct device *dev, |
1606 | struct device_attribute *attr, char *buf) | |
6ecb0c84 | 1607 | { |
ee959b00 | 1608 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1609 | |
1610 | if (target->state == SRP_TARGET_DEAD || | |
1611 | target->state == SRP_TARGET_REMOVED) | |
1612 | return -ENODEV; | |
1613 | ||
1614 | return sprintf(buf, "0x%016llx\n", | |
1615 | (unsigned long long) be64_to_cpu(target->service_id)); | |
1616 | } | |
1617 | ||
ee959b00 TJ |
1618 | static ssize_t show_pkey(struct device *dev, struct device_attribute *attr, |
1619 | char *buf) | |
6ecb0c84 | 1620 | { |
ee959b00 | 1621 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1622 | |
1623 | if (target->state == SRP_TARGET_DEAD || | |
1624 | target->state == SRP_TARGET_REMOVED) | |
1625 | return -ENODEV; | |
1626 | ||
1627 | return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); | |
1628 | } | |
1629 | ||
ee959b00 TJ |
1630 | static ssize_t show_dgid(struct device *dev, struct device_attribute *attr, |
1631 | char *buf) | |
6ecb0c84 | 1632 | { |
ee959b00 | 1633 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 RD |
1634 | |
1635 | if (target->state == SRP_TARGET_DEAD || | |
1636 | target->state == SRP_TARGET_REMOVED) | |
1637 | return -ENODEV; | |
1638 | ||
5b095d98 | 1639 | return sprintf(buf, "%pI6\n", target->path.dgid.raw); |
6ecb0c84 RD |
1640 | } |
1641 | ||
ee959b00 TJ |
1642 | static ssize_t show_orig_dgid(struct device *dev, |
1643 | struct device_attribute *attr, char *buf) | |
3633b3d0 | 1644 | { |
ee959b00 | 1645 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
3633b3d0 IR |
1646 | |
1647 | if (target->state == SRP_TARGET_DEAD || | |
1648 | target->state == SRP_TARGET_REMOVED) | |
1649 | return -ENODEV; | |
1650 | ||
5b095d98 | 1651 | return sprintf(buf, "%pI6\n", target->orig_dgid); |
3633b3d0 IR |
1652 | } |
1653 | ||
89de7486 BVA |
1654 | static ssize_t show_req_lim(struct device *dev, |
1655 | struct device_attribute *attr, char *buf) | |
1656 | { | |
1657 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1658 | ||
1659 | if (target->state == SRP_TARGET_DEAD || | |
1660 | target->state == SRP_TARGET_REMOVED) | |
1661 | return -ENODEV; | |
1662 | ||
1663 | return sprintf(buf, "%d\n", target->req_lim); | |
1664 | } | |
1665 | ||
ee959b00 TJ |
1666 | static ssize_t show_zero_req_lim(struct device *dev, |
1667 | struct device_attribute *attr, char *buf) | |
6bfa24fa | 1668 | { |
ee959b00 | 1669 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6bfa24fa RD |
1670 | |
1671 | if (target->state == SRP_TARGET_DEAD || | |
1672 | target->state == SRP_TARGET_REMOVED) | |
1673 | return -ENODEV; | |
1674 | ||
1675 | return sprintf(buf, "%d\n", target->zero_req_lim); | |
1676 | } | |
1677 | ||
ee959b00 TJ |
1678 | static ssize_t show_local_ib_port(struct device *dev, |
1679 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 1680 | { |
ee959b00 | 1681 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 IR |
1682 | |
1683 | return sprintf(buf, "%d\n", target->srp_host->port); | |
1684 | } | |
1685 | ||
ee959b00 TJ |
1686 | static ssize_t show_local_ib_device(struct device *dev, |
1687 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 1688 | { |
ee959b00 | 1689 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 | 1690 | |
05321937 | 1691 | return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name); |
ded7f1a1 IR |
1692 | } |
1693 | ||
ee959b00 TJ |
1694 | static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); |
1695 | static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); | |
1696 | static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); | |
1697 | static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); | |
1698 | static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); | |
1699 | static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL); | |
89de7486 | 1700 | static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL); |
ee959b00 TJ |
1701 | static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); |
1702 | static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); | |
1703 | static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); | |
1704 | ||
1705 | static struct device_attribute *srp_host_attrs[] = { | |
1706 | &dev_attr_id_ext, | |
1707 | &dev_attr_ioc_guid, | |
1708 | &dev_attr_service_id, | |
1709 | &dev_attr_pkey, | |
1710 | &dev_attr_dgid, | |
1711 | &dev_attr_orig_dgid, | |
89de7486 | 1712 | &dev_attr_req_lim, |
ee959b00 TJ |
1713 | &dev_attr_zero_req_lim, |
1714 | &dev_attr_local_ib_port, | |
1715 | &dev_attr_local_ib_device, | |
6ecb0c84 RD |
1716 | NULL |
1717 | }; | |
1718 | ||
aef9ec39 RD |
1719 | static struct scsi_host_template srp_template = { |
1720 | .module = THIS_MODULE, | |
b7f008fd RD |
1721 | .name = "InfiniBand SRP initiator", |
1722 | .proc_name = DRV_NAME, | |
aef9ec39 RD |
1723 | .info = srp_target_info, |
1724 | .queuecommand = srp_queuecommand, | |
1725 | .eh_abort_handler = srp_abort, | |
1726 | .eh_device_reset_handler = srp_reset_device, | |
1727 | .eh_host_reset_handler = srp_reset_host, | |
dd5e6e38 | 1728 | .can_queue = SRP_CMD_SQ_SIZE, |
aef9ec39 | 1729 | .this_id = -1, |
dd5e6e38 | 1730 | .cmd_per_lun = SRP_CMD_SQ_SIZE, |
6ecb0c84 RD |
1731 | .use_clustering = ENABLE_CLUSTERING, |
1732 | .shost_attrs = srp_host_attrs | |
aef9ec39 RD |
1733 | }; |
1734 | ||
1735 | static int srp_add_target(struct srp_host *host, struct srp_target_port *target) | |
1736 | { | |
3236822b FT |
1737 | struct srp_rport_identifiers ids; |
1738 | struct srp_rport *rport; | |
1739 | ||
aef9ec39 RD |
1740 | sprintf(target->target_name, "SRP.T10:%016llX", |
1741 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1742 | ||
05321937 | 1743 | if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device)) |
aef9ec39 RD |
1744 | return -ENODEV; |
1745 | ||
3236822b FT |
1746 | memcpy(ids.port_id, &target->id_ext, 8); |
1747 | memcpy(ids.port_id + 8, &target->ioc_guid, 8); | |
aebd5e47 | 1748 | ids.roles = SRP_RPORT_ROLE_TARGET; |
3236822b FT |
1749 | rport = srp_rport_add(target->scsi_host, &ids); |
1750 | if (IS_ERR(rport)) { | |
1751 | scsi_remove_host(target->scsi_host); | |
1752 | return PTR_ERR(rport); | |
1753 | } | |
1754 | ||
b3589fd4 | 1755 | spin_lock(&host->target_lock); |
aef9ec39 | 1756 | list_add_tail(&target->list, &host->target_list); |
b3589fd4 | 1757 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
1758 | |
1759 | target->state = SRP_TARGET_LIVE; | |
1760 | ||
aef9ec39 | 1761 | scsi_scan_target(&target->scsi_host->shost_gendev, |
1962a4a1 | 1762 | 0, target->scsi_id, SCAN_WILD_CARD, 0); |
aef9ec39 RD |
1763 | |
1764 | return 0; | |
1765 | } | |
1766 | ||
ee959b00 | 1767 | static void srp_release_dev(struct device *dev) |
aef9ec39 RD |
1768 | { |
1769 | struct srp_host *host = | |
ee959b00 | 1770 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
1771 | |
1772 | complete(&host->released); | |
1773 | } | |
1774 | ||
1775 | static struct class srp_class = { | |
1776 | .name = "infiniband_srp", | |
ee959b00 | 1777 | .dev_release = srp_release_dev |
aef9ec39 RD |
1778 | }; |
1779 | ||
1780 | /* | |
1781 | * Target ports are added by writing | |
1782 | * | |
1783 | * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, | |
1784 | * pkey=<P_Key>,service_id=<service ID> | |
1785 | * | |
1786 | * to the add_target sysfs attribute. | |
1787 | */ | |
1788 | enum { | |
1789 | SRP_OPT_ERR = 0, | |
1790 | SRP_OPT_ID_EXT = 1 << 0, | |
1791 | SRP_OPT_IOC_GUID = 1 << 1, | |
1792 | SRP_OPT_DGID = 1 << 2, | |
1793 | SRP_OPT_PKEY = 1 << 3, | |
1794 | SRP_OPT_SERVICE_ID = 1 << 4, | |
1795 | SRP_OPT_MAX_SECT = 1 << 5, | |
52fb2b50 | 1796 | SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, |
0c0450db | 1797 | SRP_OPT_IO_CLASS = 1 << 7, |
01cb9bcb | 1798 | SRP_OPT_INITIATOR_EXT = 1 << 8, |
aef9ec39 RD |
1799 | SRP_OPT_ALL = (SRP_OPT_ID_EXT | |
1800 | SRP_OPT_IOC_GUID | | |
1801 | SRP_OPT_DGID | | |
1802 | SRP_OPT_PKEY | | |
1803 | SRP_OPT_SERVICE_ID), | |
1804 | }; | |
1805 | ||
a447c093 | 1806 | static const match_table_t srp_opt_tokens = { |
52fb2b50 VP |
1807 | { SRP_OPT_ID_EXT, "id_ext=%s" }, |
1808 | { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, | |
1809 | { SRP_OPT_DGID, "dgid=%s" }, | |
1810 | { SRP_OPT_PKEY, "pkey=%x" }, | |
1811 | { SRP_OPT_SERVICE_ID, "service_id=%s" }, | |
1812 | { SRP_OPT_MAX_SECT, "max_sect=%d" }, | |
1813 | { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, | |
0c0450db | 1814 | { SRP_OPT_IO_CLASS, "io_class=%x" }, |
01cb9bcb | 1815 | { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, |
52fb2b50 | 1816 | { SRP_OPT_ERR, NULL } |
aef9ec39 RD |
1817 | }; |
1818 | ||
1819 | static int srp_parse_options(const char *buf, struct srp_target_port *target) | |
1820 | { | |
1821 | char *options, *sep_opt; | |
1822 | char *p; | |
1823 | char dgid[3]; | |
1824 | substring_t args[MAX_OPT_ARGS]; | |
1825 | int opt_mask = 0; | |
1826 | int token; | |
1827 | int ret = -EINVAL; | |
1828 | int i; | |
1829 | ||
1830 | options = kstrdup(buf, GFP_KERNEL); | |
1831 | if (!options) | |
1832 | return -ENOMEM; | |
1833 | ||
1834 | sep_opt = options; | |
1835 | while ((p = strsep(&sep_opt, ",")) != NULL) { | |
1836 | if (!*p) | |
1837 | continue; | |
1838 | ||
1839 | token = match_token(p, srp_opt_tokens, args); | |
1840 | opt_mask |= token; | |
1841 | ||
1842 | switch (token) { | |
1843 | case SRP_OPT_ID_EXT: | |
1844 | p = match_strdup(args); | |
a20f3a6d IR |
1845 | if (!p) { |
1846 | ret = -ENOMEM; | |
1847 | goto out; | |
1848 | } | |
aef9ec39 RD |
1849 | target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
1850 | kfree(p); | |
1851 | break; | |
1852 | ||
1853 | case SRP_OPT_IOC_GUID: | |
1854 | p = match_strdup(args); | |
a20f3a6d IR |
1855 | if (!p) { |
1856 | ret = -ENOMEM; | |
1857 | goto out; | |
1858 | } | |
aef9ec39 RD |
1859 | target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
1860 | kfree(p); | |
1861 | break; | |
1862 | ||
1863 | case SRP_OPT_DGID: | |
1864 | p = match_strdup(args); | |
a20f3a6d IR |
1865 | if (!p) { |
1866 | ret = -ENOMEM; | |
1867 | goto out; | |
1868 | } | |
aef9ec39 RD |
1869 | if (strlen(p) != 32) { |
1870 | printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p); | |
ce1823f0 | 1871 | kfree(p); |
aef9ec39 RD |
1872 | goto out; |
1873 | } | |
1874 | ||
1875 | for (i = 0; i < 16; ++i) { | |
1876 | strlcpy(dgid, p + i * 2, 3); | |
1877 | target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); | |
1878 | } | |
bf17c1c7 | 1879 | kfree(p); |
3633b3d0 | 1880 | memcpy(target->orig_dgid, target->path.dgid.raw, 16); |
aef9ec39 RD |
1881 | break; |
1882 | ||
1883 | case SRP_OPT_PKEY: | |
1884 | if (match_hex(args, &token)) { | |
1885 | printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p); | |
1886 | goto out; | |
1887 | } | |
1888 | target->path.pkey = cpu_to_be16(token); | |
1889 | break; | |
1890 | ||
1891 | case SRP_OPT_SERVICE_ID: | |
1892 | p = match_strdup(args); | |
a20f3a6d IR |
1893 | if (!p) { |
1894 | ret = -ENOMEM; | |
1895 | goto out; | |
1896 | } | |
aef9ec39 | 1897 | target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
247e020e | 1898 | target->path.service_id = target->service_id; |
aef9ec39 RD |
1899 | kfree(p); |
1900 | break; | |
1901 | ||
1902 | case SRP_OPT_MAX_SECT: | |
1903 | if (match_int(args, &token)) { | |
1904 | printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p); | |
1905 | goto out; | |
1906 | } | |
1907 | target->scsi_host->max_sectors = token; | |
1908 | break; | |
1909 | ||
52fb2b50 VP |
1910 | case SRP_OPT_MAX_CMD_PER_LUN: |
1911 | if (match_int(args, &token)) { | |
1912 | printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p); | |
1913 | goto out; | |
1914 | } | |
dd5e6e38 | 1915 | target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE); |
52fb2b50 VP |
1916 | break; |
1917 | ||
0c0450db R |
1918 | case SRP_OPT_IO_CLASS: |
1919 | if (match_hex(args, &token)) { | |
1920 | printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p); | |
1921 | goto out; | |
1922 | } | |
1923 | if (token != SRP_REV10_IB_IO_CLASS && | |
1924 | token != SRP_REV16A_IB_IO_CLASS) { | |
1925 | printk(KERN_WARNING PFX "unknown IO class parameter value" | |
1926 | " %x specified (use %x or %x).\n", | |
1927 | token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS); | |
1928 | goto out; | |
1929 | } | |
1930 | target->io_class = token; | |
1931 | break; | |
1932 | ||
01cb9bcb IR |
1933 | case SRP_OPT_INITIATOR_EXT: |
1934 | p = match_strdup(args); | |
a20f3a6d IR |
1935 | if (!p) { |
1936 | ret = -ENOMEM; | |
1937 | goto out; | |
1938 | } | |
01cb9bcb IR |
1939 | target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
1940 | kfree(p); | |
1941 | break; | |
1942 | ||
aef9ec39 RD |
1943 | default: |
1944 | printk(KERN_WARNING PFX "unknown parameter or missing value " | |
1945 | "'%s' in target creation request\n", p); | |
1946 | goto out; | |
1947 | } | |
1948 | } | |
1949 | ||
1950 | if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) | |
1951 | ret = 0; | |
1952 | else | |
1953 | for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) | |
1954 | if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && | |
1955 | !(srp_opt_tokens[i].token & opt_mask)) | |
1956 | printk(KERN_WARNING PFX "target creation request is " | |
1957 | "missing parameter '%s'\n", | |
1958 | srp_opt_tokens[i].pattern); | |
1959 | ||
1960 | out: | |
1961 | kfree(options); | |
1962 | return ret; | |
1963 | } | |
1964 | ||
ee959b00 TJ |
1965 | static ssize_t srp_create_target(struct device *dev, |
1966 | struct device_attribute *attr, | |
aef9ec39 RD |
1967 | const char *buf, size_t count) |
1968 | { | |
1969 | struct srp_host *host = | |
ee959b00 | 1970 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
1971 | struct Scsi_Host *target_host; |
1972 | struct srp_target_port *target; | |
1973 | int ret; | |
1974 | int i; | |
1975 | ||
1976 | target_host = scsi_host_alloc(&srp_template, | |
1977 | sizeof (struct srp_target_port)); | |
1978 | if (!target_host) | |
1979 | return -ENOMEM; | |
1980 | ||
3236822b | 1981 | target_host->transportt = ib_srp_transport_template; |
3c8edf0e AR |
1982 | target_host->max_lun = SRP_MAX_LUN; |
1983 | target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; | |
5f068992 | 1984 | |
aef9ec39 | 1985 | target = host_to_target(target_host); |
aef9ec39 | 1986 | |
0c0450db | 1987 | target->io_class = SRP_REV16A_IB_IO_CLASS; |
aef9ec39 RD |
1988 | target->scsi_host = target_host; |
1989 | target->srp_host = host; | |
1990 | ||
d945e1df | 1991 | INIT_LIST_HEAD(&target->free_reqs); |
aef9ec39 | 1992 | INIT_LIST_HEAD(&target->req_queue); |
dd5e6e38 | 1993 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { |
d945e1df RD |
1994 | target->req_ring[i].index = i; |
1995 | list_add_tail(&target->req_ring[i].list, &target->free_reqs); | |
1996 | } | |
aef9ec39 RD |
1997 | |
1998 | ret = srp_parse_options(buf, target); | |
1999 | if (ret) | |
2000 | goto err; | |
2001 | ||
969a60f9 | 2002 | ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid); |
aef9ec39 | 2003 | |
7aa54bd7 DD |
2004 | shost_printk(KERN_DEBUG, target->scsi_host, PFX |
2005 | "new target: id_ext %016llx ioc_guid %016llx pkey %04x " | |
5b095d98 | 2006 | "service_id %016llx dgid %pI6\n", |
aef9ec39 RD |
2007 | (unsigned long long) be64_to_cpu(target->id_ext), |
2008 | (unsigned long long) be64_to_cpu(target->ioc_guid), | |
2009 | be16_to_cpu(target->path.pkey), | |
2010 | (unsigned long long) be64_to_cpu(target->service_id), | |
8867cd7c | 2011 | target->path.dgid.raw); |
aef9ec39 RD |
2012 | |
2013 | ret = srp_create_target_ib(target); | |
2014 | if (ret) | |
2015 | goto err; | |
2016 | ||
9fe4bcf4 DD |
2017 | ret = srp_new_cm_id(target); |
2018 | if (ret) | |
aef9ec39 | 2019 | goto err_free; |
aef9ec39 | 2020 | |
1033ff67 | 2021 | target->qp_in_error = 0; |
aef9ec39 RD |
2022 | ret = srp_connect_target(target); |
2023 | if (ret) { | |
7aa54bd7 DD |
2024 | shost_printk(KERN_ERR, target->scsi_host, |
2025 | PFX "Connection failed\n"); | |
aef9ec39 RD |
2026 | goto err_cm_id; |
2027 | } | |
2028 | ||
2029 | ret = srp_add_target(host, target); | |
2030 | if (ret) | |
2031 | goto err_disconnect; | |
2032 | ||
2033 | return count; | |
2034 | ||
2035 | err_disconnect: | |
2036 | srp_disconnect_target(target); | |
2037 | ||
2038 | err_cm_id: | |
2039 | ib_destroy_cm_id(target->cm_id); | |
2040 | ||
2041 | err_free: | |
2042 | srp_free_target_ib(target); | |
2043 | ||
2044 | err: | |
2045 | scsi_host_put(target_host); | |
2046 | ||
2047 | return ret; | |
2048 | } | |
2049 | ||
ee959b00 | 2050 | static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); |
aef9ec39 | 2051 | |
ee959b00 TJ |
2052 | static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, |
2053 | char *buf) | |
aef9ec39 | 2054 | { |
ee959b00 | 2055 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 | 2056 | |
05321937 | 2057 | return sprintf(buf, "%s\n", host->srp_dev->dev->name); |
aef9ec39 RD |
2058 | } |
2059 | ||
ee959b00 | 2060 | static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
aef9ec39 | 2061 | |
ee959b00 TJ |
2062 | static ssize_t show_port(struct device *dev, struct device_attribute *attr, |
2063 | char *buf) | |
aef9ec39 | 2064 | { |
ee959b00 | 2065 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2066 | |
2067 | return sprintf(buf, "%d\n", host->port); | |
2068 | } | |
2069 | ||
ee959b00 | 2070 | static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); |
aef9ec39 | 2071 | |
f5358a17 | 2072 | static struct srp_host *srp_add_port(struct srp_device *device, u8 port) |
aef9ec39 RD |
2073 | { |
2074 | struct srp_host *host; | |
2075 | ||
2076 | host = kzalloc(sizeof *host, GFP_KERNEL); | |
2077 | if (!host) | |
2078 | return NULL; | |
2079 | ||
2080 | INIT_LIST_HEAD(&host->target_list); | |
b3589fd4 | 2081 | spin_lock_init(&host->target_lock); |
aef9ec39 | 2082 | init_completion(&host->released); |
05321937 | 2083 | host->srp_dev = device; |
aef9ec39 RD |
2084 | host->port = port; |
2085 | ||
ee959b00 TJ |
2086 | host->dev.class = &srp_class; |
2087 | host->dev.parent = device->dev->dma_device; | |
d927e38c | 2088 | dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port); |
aef9ec39 | 2089 | |
ee959b00 | 2090 | if (device_register(&host->dev)) |
f5358a17 | 2091 | goto free_host; |
ee959b00 | 2092 | if (device_create_file(&host->dev, &dev_attr_add_target)) |
aef9ec39 | 2093 | goto err_class; |
ee959b00 | 2094 | if (device_create_file(&host->dev, &dev_attr_ibdev)) |
aef9ec39 | 2095 | goto err_class; |
ee959b00 | 2096 | if (device_create_file(&host->dev, &dev_attr_port)) |
aef9ec39 RD |
2097 | goto err_class; |
2098 | ||
2099 | return host; | |
2100 | ||
2101 | err_class: | |
ee959b00 | 2102 | device_unregister(&host->dev); |
aef9ec39 | 2103 | |
f5358a17 | 2104 | free_host: |
aef9ec39 RD |
2105 | kfree(host); |
2106 | ||
2107 | return NULL; | |
2108 | } | |
2109 | ||
2110 | static void srp_add_one(struct ib_device *device) | |
2111 | { | |
f5358a17 RD |
2112 | struct srp_device *srp_dev; |
2113 | struct ib_device_attr *dev_attr; | |
2114 | struct ib_fmr_pool_param fmr_param; | |
aef9ec39 | 2115 | struct srp_host *host; |
aef9ec39 RD |
2116 | int s, e, p; |
2117 | ||
f5358a17 RD |
2118 | dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); |
2119 | if (!dev_attr) | |
cf311cd4 | 2120 | return; |
aef9ec39 | 2121 | |
f5358a17 RD |
2122 | if (ib_query_device(device, dev_attr)) { |
2123 | printk(KERN_WARNING PFX "Query device failed for %s\n", | |
2124 | device->name); | |
2125 | goto free_attr; | |
2126 | } | |
2127 | ||
2128 | srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); | |
2129 | if (!srp_dev) | |
2130 | goto free_attr; | |
2131 | ||
2132 | /* | |
2133 | * Use the smallest page size supported by the HCA, down to a | |
2134 | * minimum of 512 bytes (which is the smallest sector that a | |
2135 | * SCSI command will ever carry). | |
2136 | */ | |
2137 | srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1); | |
2138 | srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift; | |
bf628dc2 | 2139 | srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1); |
f5358a17 RD |
2140 | |
2141 | INIT_LIST_HEAD(&srp_dev->dev_list); | |
2142 | ||
2143 | srp_dev->dev = device; | |
2144 | srp_dev->pd = ib_alloc_pd(device); | |
2145 | if (IS_ERR(srp_dev->pd)) | |
2146 | goto free_dev; | |
2147 | ||
2148 | srp_dev->mr = ib_get_dma_mr(srp_dev->pd, | |
2149 | IB_ACCESS_LOCAL_WRITE | | |
2150 | IB_ACCESS_REMOTE_READ | | |
2151 | IB_ACCESS_REMOTE_WRITE); | |
2152 | if (IS_ERR(srp_dev->mr)) | |
2153 | goto err_pd; | |
2154 | ||
2155 | memset(&fmr_param, 0, sizeof fmr_param); | |
2156 | fmr_param.pool_size = SRP_FMR_POOL_SIZE; | |
2157 | fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; | |
2158 | fmr_param.cache = 1; | |
2159 | fmr_param.max_pages_per_fmr = SRP_FMR_SIZE; | |
2160 | fmr_param.page_shift = srp_dev->fmr_page_shift; | |
2161 | fmr_param.access = (IB_ACCESS_LOCAL_WRITE | | |
2162 | IB_ACCESS_REMOTE_WRITE | | |
2163 | IB_ACCESS_REMOTE_READ); | |
2164 | ||
2165 | srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); | |
2166 | if (IS_ERR(srp_dev->fmr_pool)) | |
2167 | srp_dev->fmr_pool = NULL; | |
aef9ec39 | 2168 | |
07ebafba | 2169 | if (device->node_type == RDMA_NODE_IB_SWITCH) { |
aef9ec39 RD |
2170 | s = 0; |
2171 | e = 0; | |
2172 | } else { | |
2173 | s = 1; | |
2174 | e = device->phys_port_cnt; | |
2175 | } | |
2176 | ||
2177 | for (p = s; p <= e; ++p) { | |
f5358a17 | 2178 | host = srp_add_port(srp_dev, p); |
aef9ec39 | 2179 | if (host) |
f5358a17 | 2180 | list_add_tail(&host->list, &srp_dev->dev_list); |
aef9ec39 RD |
2181 | } |
2182 | ||
f5358a17 RD |
2183 | ib_set_client_data(device, &srp_client, srp_dev); |
2184 | ||
2185 | goto free_attr; | |
2186 | ||
2187 | err_pd: | |
2188 | ib_dealloc_pd(srp_dev->pd); | |
2189 | ||
2190 | free_dev: | |
2191 | kfree(srp_dev); | |
2192 | ||
2193 | free_attr: | |
2194 | kfree(dev_attr); | |
aef9ec39 RD |
2195 | } |
2196 | ||
2197 | static void srp_remove_one(struct ib_device *device) | |
2198 | { | |
f5358a17 | 2199 | struct srp_device *srp_dev; |
aef9ec39 RD |
2200 | struct srp_host *host, *tmp_host; |
2201 | LIST_HEAD(target_list); | |
2202 | struct srp_target_port *target, *tmp_target; | |
aef9ec39 | 2203 | |
f5358a17 | 2204 | srp_dev = ib_get_client_data(device, &srp_client); |
aef9ec39 | 2205 | |
f5358a17 | 2206 | list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { |
ee959b00 | 2207 | device_unregister(&host->dev); |
aef9ec39 RD |
2208 | /* |
2209 | * Wait for the sysfs entry to go away, so that no new | |
2210 | * target ports can be created. | |
2211 | */ | |
2212 | wait_for_completion(&host->released); | |
2213 | ||
2214 | /* | |
2215 | * Mark all target ports as removed, so we stop queueing | |
2216 | * commands and don't try to reconnect. | |
2217 | */ | |
b3589fd4 | 2218 | spin_lock(&host->target_lock); |
549c5fc2 | 2219 | list_for_each_entry(target, &host->target_list, list) { |
0c5b3952 IR |
2220 | spin_lock_irq(target->scsi_host->host_lock); |
2221 | target->state = SRP_TARGET_REMOVED; | |
2222 | spin_unlock_irq(target->scsi_host->host_lock); | |
aef9ec39 | 2223 | } |
b3589fd4 | 2224 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
2225 | |
2226 | /* | |
2227 | * Wait for any reconnection tasks that may have | |
2228 | * started before we marked our target ports as | |
2229 | * removed, and any target port removal tasks. | |
2230 | */ | |
2231 | flush_scheduled_work(); | |
2232 | ||
2233 | list_for_each_entry_safe(target, tmp_target, | |
2234 | &host->target_list, list) { | |
b0e47c8b | 2235 | srp_remove_host(target->scsi_host); |
ad696989 | 2236 | scsi_remove_host(target->scsi_host); |
aef9ec39 RD |
2237 | srp_disconnect_target(target); |
2238 | ib_destroy_cm_id(target->cm_id); | |
2239 | srp_free_target_ib(target); | |
2240 | scsi_host_put(target->scsi_host); | |
2241 | } | |
2242 | ||
aef9ec39 RD |
2243 | kfree(host); |
2244 | } | |
2245 | ||
f5358a17 RD |
2246 | if (srp_dev->fmr_pool) |
2247 | ib_destroy_fmr_pool(srp_dev->fmr_pool); | |
2248 | ib_dereg_mr(srp_dev->mr); | |
2249 | ib_dealloc_pd(srp_dev->pd); | |
2250 | ||
2251 | kfree(srp_dev); | |
aef9ec39 RD |
2252 | } |
2253 | ||
3236822b FT |
2254 | static struct srp_function_template ib_srp_transport_functions = { |
2255 | }; | |
2256 | ||
aef9ec39 RD |
2257 | static int __init srp_init_module(void) |
2258 | { | |
2259 | int ret; | |
2260 | ||
dd5e6e38 BVA |
2261 | BUILD_BUG_ON_NOT_POWER_OF_2(SRP_SQ_SIZE); |
2262 | BUILD_BUG_ON_NOT_POWER_OF_2(SRP_RQ_SIZE); | |
2263 | ||
1e89a194 DD |
2264 | if (srp_sg_tablesize > 255) { |
2265 | printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n"); | |
2266 | srp_sg_tablesize = 255; | |
2267 | } | |
2268 | ||
3236822b FT |
2269 | ib_srp_transport_template = |
2270 | srp_attach_transport(&ib_srp_transport_functions); | |
2271 | if (!ib_srp_transport_template) | |
2272 | return -ENOMEM; | |
2273 | ||
74b0a15b VP |
2274 | srp_template.sg_tablesize = srp_sg_tablesize; |
2275 | srp_max_iu_len = (sizeof (struct srp_cmd) + | |
2276 | sizeof (struct srp_indirect_buf) + | |
2277 | srp_sg_tablesize * 16); | |
2278 | ||
aef9ec39 RD |
2279 | ret = class_register(&srp_class); |
2280 | if (ret) { | |
2281 | printk(KERN_ERR PFX "couldn't register class infiniband_srp\n"); | |
3236822b | 2282 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
2283 | return ret; |
2284 | } | |
2285 | ||
c1a0b23b MT |
2286 | ib_sa_register_client(&srp_sa_client); |
2287 | ||
aef9ec39 RD |
2288 | ret = ib_register_client(&srp_client); |
2289 | if (ret) { | |
2290 | printk(KERN_ERR PFX "couldn't register IB client\n"); | |
3236822b | 2291 | srp_release_transport(ib_srp_transport_template); |
c1a0b23b | 2292 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 RD |
2293 | class_unregister(&srp_class); |
2294 | return ret; | |
2295 | } | |
2296 | ||
2297 | return 0; | |
2298 | } | |
2299 | ||
2300 | static void __exit srp_cleanup_module(void) | |
2301 | { | |
2302 | ib_unregister_client(&srp_client); | |
c1a0b23b | 2303 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 | 2304 | class_unregister(&srp_class); |
3236822b | 2305 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
2306 | } |
2307 | ||
2308 | module_init(srp_init_module); | |
2309 | module_exit(srp_cleanup_module); |