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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 | ||
e0bda7d8 BVA |
33 | #define pr_fmt(fmt) PFX fmt |
34 | ||
aef9ec39 RD |
35 | #include <linux/module.h> |
36 | #include <linux/init.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/err.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/parser.h> | |
41 | #include <linux/random.h> | |
de25968c | 42 | #include <linux/jiffies.h> |
aef9ec39 | 43 | |
60063497 | 44 | #include <linux/atomic.h> |
aef9ec39 RD |
45 | |
46 | #include <scsi/scsi.h> | |
47 | #include <scsi/scsi_device.h> | |
48 | #include <scsi/scsi_dbg.h> | |
49 | #include <scsi/srp.h> | |
3236822b | 50 | #include <scsi/scsi_transport_srp.h> |
aef9ec39 | 51 | |
aef9ec39 RD |
52 | #include "ib_srp.h" |
53 | ||
54 | #define DRV_NAME "ib_srp" | |
55 | #define PFX DRV_NAME ": " | |
56 | #define DRV_VERSION "0.2" | |
57 | #define DRV_RELDATE "November 1, 2005" | |
58 | ||
59 | MODULE_AUTHOR("Roland Dreier"); | |
60 | MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator " | |
61 | "v" DRV_VERSION " (" DRV_RELDATE ")"); | |
62 | MODULE_LICENSE("Dual BSD/GPL"); | |
63 | ||
49248644 DD |
64 | static unsigned int srp_sg_tablesize; |
65 | static unsigned int cmd_sg_entries; | |
c07d424d DD |
66 | static unsigned int indirect_sg_entries; |
67 | static bool allow_ext_sg; | |
49248644 | 68 | static int topspin_workarounds = 1; |
74b0a15b | 69 | |
49248644 DD |
70 | module_param(srp_sg_tablesize, uint, 0444); |
71 | MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries"); | |
74b0a15b | 72 | |
49248644 DD |
73 | module_param(cmd_sg_entries, uint, 0444); |
74 | MODULE_PARM_DESC(cmd_sg_entries, | |
75 | "Default number of gather/scatter entries in the SRP command (default is 12, max 255)"); | |
aef9ec39 | 76 | |
c07d424d DD |
77 | module_param(indirect_sg_entries, uint, 0444); |
78 | MODULE_PARM_DESC(indirect_sg_entries, | |
79 | "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")"); | |
80 | ||
81 | module_param(allow_ext_sg, bool, 0444); | |
82 | MODULE_PARM_DESC(allow_ext_sg, | |
83 | "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)"); | |
84 | ||
aef9ec39 RD |
85 | module_param(topspin_workarounds, int, 0444); |
86 | MODULE_PARM_DESC(topspin_workarounds, | |
87 | "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); | |
88 | ||
aef9ec39 RD |
89 | static void srp_add_one(struct ib_device *device); |
90 | static void srp_remove_one(struct ib_device *device); | |
9c03dc9f BVA |
91 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr); |
92 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr); | |
aef9ec39 RD |
93 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); |
94 | ||
3236822b FT |
95 | static struct scsi_transport_template *ib_srp_transport_template; |
96 | ||
aef9ec39 RD |
97 | static struct ib_client srp_client = { |
98 | .name = "srp", | |
99 | .add = srp_add_one, | |
100 | .remove = srp_remove_one | |
101 | }; | |
102 | ||
c1a0b23b MT |
103 | static struct ib_sa_client srp_sa_client; |
104 | ||
aef9ec39 RD |
105 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) |
106 | { | |
107 | return (struct srp_target_port *) host->hostdata; | |
108 | } | |
109 | ||
110 | static const char *srp_target_info(struct Scsi_Host *host) | |
111 | { | |
112 | return host_to_target(host)->target_name; | |
113 | } | |
114 | ||
5d7cbfd6 RD |
115 | static int srp_target_is_topspin(struct srp_target_port *target) |
116 | { | |
117 | static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; | |
3d1ff48d | 118 | static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d }; |
5d7cbfd6 RD |
119 | |
120 | return topspin_workarounds && | |
3d1ff48d RK |
121 | (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) || |
122 | !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui)); | |
5d7cbfd6 RD |
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 | { | |
e0bda7d8 | 170 | pr_debug("QP event %d\n", event->event); |
aef9ec39 RD |
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; | |
73aa89ed IR |
225 | struct ib_cq *recv_cq, *send_cq; |
226 | struct ib_qp *qp; | |
aef9ec39 RD |
227 | int ret; |
228 | ||
229 | init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); | |
230 | if (!init_attr) | |
231 | return -ENOMEM; | |
232 | ||
73aa89ed IR |
233 | recv_cq = ib_create_cq(target->srp_host->srp_dev->dev, |
234 | srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0); | |
235 | if (IS_ERR(recv_cq)) { | |
236 | ret = PTR_ERR(recv_cq); | |
da9d2f07 | 237 | goto err; |
aef9ec39 RD |
238 | } |
239 | ||
73aa89ed IR |
240 | send_cq = ib_create_cq(target->srp_host->srp_dev->dev, |
241 | srp_send_completion, NULL, target, SRP_SQ_SIZE, 0); | |
242 | if (IS_ERR(send_cq)) { | |
243 | ret = PTR_ERR(send_cq); | |
da9d2f07 | 244 | goto err_recv_cq; |
9c03dc9f BVA |
245 | } |
246 | ||
73aa89ed | 247 | ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP); |
aef9ec39 RD |
248 | |
249 | init_attr->event_handler = srp_qp_event; | |
250 | init_attr->cap.max_send_wr = SRP_SQ_SIZE; | |
251 | init_attr->cap.max_recv_wr = SRP_RQ_SIZE; | |
252 | init_attr->cap.max_recv_sge = 1; | |
253 | init_attr->cap.max_send_sge = 1; | |
254 | init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; | |
255 | init_attr->qp_type = IB_QPT_RC; | |
73aa89ed IR |
256 | init_attr->send_cq = send_cq; |
257 | init_attr->recv_cq = recv_cq; | |
aef9ec39 | 258 | |
73aa89ed IR |
259 | qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr); |
260 | if (IS_ERR(qp)) { | |
261 | ret = PTR_ERR(qp); | |
da9d2f07 | 262 | goto err_send_cq; |
aef9ec39 RD |
263 | } |
264 | ||
73aa89ed | 265 | ret = srp_init_qp(target, qp); |
da9d2f07 RD |
266 | if (ret) |
267 | goto err_qp; | |
aef9ec39 | 268 | |
73aa89ed IR |
269 | if (target->qp) |
270 | ib_destroy_qp(target->qp); | |
271 | if (target->recv_cq) | |
272 | ib_destroy_cq(target->recv_cq); | |
273 | if (target->send_cq) | |
274 | ib_destroy_cq(target->send_cq); | |
275 | ||
276 | target->qp = qp; | |
277 | target->recv_cq = recv_cq; | |
278 | target->send_cq = send_cq; | |
279 | ||
da9d2f07 RD |
280 | kfree(init_attr); |
281 | return 0; | |
282 | ||
283 | err_qp: | |
73aa89ed | 284 | ib_destroy_qp(qp); |
da9d2f07 RD |
285 | |
286 | err_send_cq: | |
73aa89ed | 287 | ib_destroy_cq(send_cq); |
da9d2f07 RD |
288 | |
289 | err_recv_cq: | |
73aa89ed | 290 | ib_destroy_cq(recv_cq); |
da9d2f07 RD |
291 | |
292 | err: | |
aef9ec39 RD |
293 | kfree(init_attr); |
294 | return ret; | |
295 | } | |
296 | ||
297 | static void srp_free_target_ib(struct srp_target_port *target) | |
298 | { | |
299 | int i; | |
300 | ||
301 | ib_destroy_qp(target->qp); | |
9c03dc9f BVA |
302 | ib_destroy_cq(target->send_cq); |
303 | ib_destroy_cq(target->recv_cq); | |
aef9ec39 | 304 | |
73aa89ed IR |
305 | target->qp = NULL; |
306 | target->send_cq = target->recv_cq = NULL; | |
307 | ||
aef9ec39 RD |
308 | for (i = 0; i < SRP_RQ_SIZE; ++i) |
309 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
dd5e6e38 | 310 | for (i = 0; i < SRP_SQ_SIZE; ++i) |
aef9ec39 RD |
311 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
312 | } | |
313 | ||
314 | static void srp_path_rec_completion(int status, | |
315 | struct ib_sa_path_rec *pathrec, | |
316 | void *target_ptr) | |
317 | { | |
318 | struct srp_target_port *target = target_ptr; | |
319 | ||
320 | target->status = status; | |
321 | if (status) | |
7aa54bd7 DD |
322 | shost_printk(KERN_ERR, target->scsi_host, |
323 | PFX "Got failed path rec status %d\n", status); | |
aef9ec39 RD |
324 | else |
325 | target->path = *pathrec; | |
326 | complete(&target->done); | |
327 | } | |
328 | ||
329 | static int srp_lookup_path(struct srp_target_port *target) | |
330 | { | |
331 | target->path.numb_path = 1; | |
332 | ||
333 | init_completion(&target->done); | |
334 | ||
c1a0b23b | 335 | target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, |
05321937 | 336 | target->srp_host->srp_dev->dev, |
aef9ec39 RD |
337 | target->srp_host->port, |
338 | &target->path, | |
247e020e | 339 | IB_SA_PATH_REC_SERVICE_ID | |
aef9ec39 RD |
340 | IB_SA_PATH_REC_DGID | |
341 | IB_SA_PATH_REC_SGID | | |
342 | IB_SA_PATH_REC_NUMB_PATH | | |
343 | IB_SA_PATH_REC_PKEY, | |
344 | SRP_PATH_REC_TIMEOUT_MS, | |
345 | GFP_KERNEL, | |
346 | srp_path_rec_completion, | |
347 | target, &target->path_query); | |
348 | if (target->path_query_id < 0) | |
349 | return target->path_query_id; | |
350 | ||
351 | wait_for_completion(&target->done); | |
352 | ||
353 | if (target->status < 0) | |
7aa54bd7 DD |
354 | shost_printk(KERN_WARNING, target->scsi_host, |
355 | PFX "Path record query failed\n"); | |
aef9ec39 RD |
356 | |
357 | return target->status; | |
358 | } | |
359 | ||
360 | static int srp_send_req(struct srp_target_port *target) | |
361 | { | |
362 | struct { | |
363 | struct ib_cm_req_param param; | |
364 | struct srp_login_req priv; | |
365 | } *req = NULL; | |
366 | int status; | |
367 | ||
368 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
369 | if (!req) | |
370 | return -ENOMEM; | |
371 | ||
372 | req->param.primary_path = &target->path; | |
373 | req->param.alternate_path = NULL; | |
374 | req->param.service_id = target->service_id; | |
375 | req->param.qp_num = target->qp->qp_num; | |
376 | req->param.qp_type = target->qp->qp_type; | |
377 | req->param.private_data = &req->priv; | |
378 | req->param.private_data_len = sizeof req->priv; | |
379 | req->param.flow_control = 1; | |
380 | ||
381 | get_random_bytes(&req->param.starting_psn, 4); | |
382 | req->param.starting_psn &= 0xffffff; | |
383 | ||
384 | /* | |
385 | * Pick some arbitrary defaults here; we could make these | |
386 | * module parameters if anyone cared about setting them. | |
387 | */ | |
388 | req->param.responder_resources = 4; | |
389 | req->param.remote_cm_response_timeout = 20; | |
390 | req->param.local_cm_response_timeout = 20; | |
391 | req->param.retry_count = 7; | |
392 | req->param.rnr_retry_count = 7; | |
393 | req->param.max_cm_retries = 15; | |
394 | ||
395 | req->priv.opcode = SRP_LOGIN_REQ; | |
396 | req->priv.tag = 0; | |
49248644 | 397 | req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len); |
aef9ec39 RD |
398 | req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
399 | SRP_BUF_FORMAT_INDIRECT); | |
0c0450db | 400 | /* |
3cd96564 | 401 | * In the published SRP specification (draft rev. 16a), the |
0c0450db R |
402 | * port identifier format is 8 bytes of ID extension followed |
403 | * by 8 bytes of GUID. Older drafts put the two halves in the | |
404 | * opposite order, so that the GUID comes first. | |
405 | * | |
406 | * Targets conforming to these obsolete drafts can be | |
407 | * recognized by the I/O Class they report. | |
408 | */ | |
409 | if (target->io_class == SRP_REV10_IB_IO_CLASS) { | |
410 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb | 411 | &target->path.sgid.global.interface_id, 8); |
0c0450db | 412 | memcpy(req->priv.initiator_port_id + 8, |
01cb9bcb | 413 | &target->initiator_ext, 8); |
0c0450db R |
414 | memcpy(req->priv.target_port_id, &target->ioc_guid, 8); |
415 | memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); | |
416 | } else { | |
417 | memcpy(req->priv.initiator_port_id, | |
01cb9bcb IR |
418 | &target->initiator_ext, 8); |
419 | memcpy(req->priv.initiator_port_id + 8, | |
420 | &target->path.sgid.global.interface_id, 8); | |
0c0450db R |
421 | memcpy(req->priv.target_port_id, &target->id_ext, 8); |
422 | memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); | |
423 | } | |
424 | ||
aef9ec39 RD |
425 | /* |
426 | * Topspin/Cisco SRP targets will reject our login unless we | |
01cb9bcb IR |
427 | * zero out the first 8 bytes of our initiator port ID and set |
428 | * the second 8 bytes to the local node GUID. | |
aef9ec39 | 429 | */ |
5d7cbfd6 | 430 | if (srp_target_is_topspin(target)) { |
7aa54bd7 DD |
431 | shost_printk(KERN_DEBUG, target->scsi_host, |
432 | PFX "Topspin/Cisco initiator port ID workaround " | |
433 | "activated for target GUID %016llx\n", | |
434 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
aef9ec39 | 435 | memset(req->priv.initiator_port_id, 0, 8); |
01cb9bcb | 436 | memcpy(req->priv.initiator_port_id + 8, |
05321937 | 437 | &target->srp_host->srp_dev->dev->node_guid, 8); |
aef9ec39 | 438 | } |
aef9ec39 RD |
439 | |
440 | status = ib_send_cm_req(target->cm_id, &req->param); | |
441 | ||
442 | kfree(req); | |
443 | ||
444 | return status; | |
445 | } | |
446 | ||
ef6c49d8 BVA |
447 | static bool srp_queue_remove_work(struct srp_target_port *target) |
448 | { | |
449 | bool changed = false; | |
450 | ||
451 | spin_lock_irq(&target->lock); | |
452 | if (target->state != SRP_TARGET_REMOVED) { | |
453 | target->state = SRP_TARGET_REMOVED; | |
454 | changed = true; | |
455 | } | |
456 | spin_unlock_irq(&target->lock); | |
457 | ||
458 | if (changed) | |
459 | queue_work(system_long_wq, &target->remove_work); | |
460 | ||
461 | return changed; | |
462 | } | |
463 | ||
294c875a BVA |
464 | static bool srp_change_conn_state(struct srp_target_port *target, |
465 | bool connected) | |
466 | { | |
467 | bool changed = false; | |
468 | ||
469 | spin_lock_irq(&target->lock); | |
470 | if (target->connected != connected) { | |
471 | target->connected = connected; | |
472 | changed = true; | |
473 | } | |
474 | spin_unlock_irq(&target->lock); | |
475 | ||
476 | return changed; | |
477 | } | |
478 | ||
aef9ec39 RD |
479 | static void srp_disconnect_target(struct srp_target_port *target) |
480 | { | |
294c875a BVA |
481 | if (srp_change_conn_state(target, false)) { |
482 | /* XXX should send SRP_I_LOGOUT request */ | |
aef9ec39 | 483 | |
294c875a BVA |
484 | if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { |
485 | shost_printk(KERN_DEBUG, target->scsi_host, | |
486 | PFX "Sending CM DREQ failed\n"); | |
294c875a | 487 | } |
e6581056 | 488 | } |
aef9ec39 RD |
489 | } |
490 | ||
8f26c9ff DD |
491 | static void srp_free_req_data(struct srp_target_port *target) |
492 | { | |
c07d424d | 493 | struct ib_device *ibdev = target->srp_host->srp_dev->dev; |
8f26c9ff DD |
494 | struct srp_request *req; |
495 | int i; | |
496 | ||
497 | for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) { | |
498 | kfree(req->fmr_list); | |
499 | kfree(req->map_page); | |
c07d424d DD |
500 | if (req->indirect_dma_addr) { |
501 | ib_dma_unmap_single(ibdev, req->indirect_dma_addr, | |
502 | target->indirect_size, | |
503 | DMA_TO_DEVICE); | |
504 | } | |
505 | kfree(req->indirect_desc); | |
8f26c9ff DD |
506 | } |
507 | } | |
508 | ||
683b159a BVA |
509 | /** |
510 | * srp_del_scsi_host_attr() - Remove attributes defined in the host template. | |
511 | * @shost: SCSI host whose attributes to remove from sysfs. | |
512 | * | |
513 | * Note: Any attributes defined in the host template and that did not exist | |
514 | * before invocation of this function will be ignored. | |
515 | */ | |
516 | static void srp_del_scsi_host_attr(struct Scsi_Host *shost) | |
517 | { | |
518 | struct device_attribute **attr; | |
519 | ||
520 | for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr) | |
521 | device_remove_file(&shost->shost_dev, *attr); | |
522 | } | |
523 | ||
ee12d6a8 BVA |
524 | static void srp_remove_target(struct srp_target_port *target) |
525 | { | |
ef6c49d8 BVA |
526 | WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); |
527 | ||
ee12d6a8 BVA |
528 | srp_del_scsi_host_attr(target->scsi_host); |
529 | srp_remove_host(target->scsi_host); | |
530 | scsi_remove_host(target->scsi_host); | |
ef6c49d8 | 531 | srp_disconnect_target(target); |
ee12d6a8 BVA |
532 | ib_destroy_cm_id(target->cm_id); |
533 | srp_free_target_ib(target); | |
534 | srp_free_req_data(target); | |
535 | scsi_host_put(target->scsi_host); | |
536 | } | |
537 | ||
c4028958 | 538 | static void srp_remove_work(struct work_struct *work) |
aef9ec39 | 539 | { |
c4028958 | 540 | struct srp_target_port *target = |
ef6c49d8 | 541 | container_of(work, struct srp_target_port, remove_work); |
aef9ec39 | 542 | |
ef6c49d8 | 543 | WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); |
aef9ec39 | 544 | |
b3589fd4 | 545 | spin_lock(&target->srp_host->target_lock); |
aef9ec39 | 546 | list_del(&target->list); |
b3589fd4 | 547 | spin_unlock(&target->srp_host->target_lock); |
aef9ec39 | 548 | |
ee12d6a8 | 549 | srp_remove_target(target); |
aef9ec39 RD |
550 | } |
551 | ||
dc1bdbd9 BVA |
552 | static void srp_rport_delete(struct srp_rport *rport) |
553 | { | |
554 | struct srp_target_port *target = rport->lld_data; | |
555 | ||
556 | srp_queue_remove_work(target); | |
557 | } | |
558 | ||
aef9ec39 RD |
559 | static int srp_connect_target(struct srp_target_port *target) |
560 | { | |
9fe4bcf4 | 561 | int retries = 3; |
aef9ec39 RD |
562 | int ret; |
563 | ||
294c875a BVA |
564 | WARN_ON_ONCE(target->connected); |
565 | ||
948d1e88 BVA |
566 | target->qp_in_error = false; |
567 | ||
aef9ec39 RD |
568 | ret = srp_lookup_path(target); |
569 | if (ret) | |
570 | return ret; | |
571 | ||
572 | while (1) { | |
573 | init_completion(&target->done); | |
574 | ret = srp_send_req(target); | |
575 | if (ret) | |
576 | return ret; | |
577 | wait_for_completion(&target->done); | |
578 | ||
579 | /* | |
580 | * The CM event handling code will set status to | |
581 | * SRP_PORT_REDIRECT if we get a port redirect REJ | |
582 | * back, or SRP_DLID_REDIRECT if we get a lid/qp | |
583 | * redirect REJ back. | |
584 | */ | |
585 | switch (target->status) { | |
586 | case 0: | |
294c875a | 587 | srp_change_conn_state(target, true); |
aef9ec39 RD |
588 | return 0; |
589 | ||
590 | case SRP_PORT_REDIRECT: | |
591 | ret = srp_lookup_path(target); | |
592 | if (ret) | |
593 | return ret; | |
594 | break; | |
595 | ||
596 | case SRP_DLID_REDIRECT: | |
597 | break; | |
598 | ||
9fe4bcf4 DD |
599 | case SRP_STALE_CONN: |
600 | /* Our current CM id was stale, and is now in timewait. | |
601 | * Try to reconnect with a new one. | |
602 | */ | |
603 | if (!retries-- || srp_new_cm_id(target)) { | |
604 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
605 | "giving up on stale connection\n"); | |
606 | target->status = -ECONNRESET; | |
607 | return target->status; | |
608 | } | |
609 | ||
610 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
611 | "retrying stale connection\n"); | |
612 | break; | |
613 | ||
aef9ec39 RD |
614 | default: |
615 | return target->status; | |
616 | } | |
617 | } | |
618 | } | |
619 | ||
d945e1df RD |
620 | static void srp_unmap_data(struct scsi_cmnd *scmnd, |
621 | struct srp_target_port *target, | |
622 | struct srp_request *req) | |
623 | { | |
8f26c9ff DD |
624 | struct ib_device *ibdev = target->srp_host->srp_dev->dev; |
625 | struct ib_pool_fmr **pfmr; | |
626 | ||
bb350d1d | 627 | if (!scsi_sglist(scmnd) || |
d945e1df RD |
628 | (scmnd->sc_data_direction != DMA_TO_DEVICE && |
629 | scmnd->sc_data_direction != DMA_FROM_DEVICE)) | |
630 | return; | |
631 | ||
8f26c9ff DD |
632 | pfmr = req->fmr_list; |
633 | while (req->nfmr--) | |
634 | ib_fmr_pool_unmap(*pfmr++); | |
f5358a17 | 635 | |
8f26c9ff DD |
636 | ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd), |
637 | scmnd->sc_data_direction); | |
d945e1df RD |
638 | } |
639 | ||
22032991 BVA |
640 | /** |
641 | * srp_claim_req - Take ownership of the scmnd associated with a request. | |
642 | * @target: SRP target port. | |
643 | * @req: SRP request. | |
644 | * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take | |
645 | * ownership of @req->scmnd if it equals @scmnd. | |
646 | * | |
647 | * Return value: | |
648 | * Either NULL or a pointer to the SCSI command the caller became owner of. | |
649 | */ | |
650 | static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target, | |
651 | struct srp_request *req, | |
652 | struct scsi_cmnd *scmnd) | |
653 | { | |
654 | unsigned long flags; | |
655 | ||
656 | spin_lock_irqsave(&target->lock, flags); | |
657 | if (!scmnd) { | |
658 | scmnd = req->scmnd; | |
659 | req->scmnd = NULL; | |
660 | } else if (req->scmnd == scmnd) { | |
661 | req->scmnd = NULL; | |
662 | } else { | |
663 | scmnd = NULL; | |
664 | } | |
665 | spin_unlock_irqrestore(&target->lock, flags); | |
666 | ||
667 | return scmnd; | |
668 | } | |
669 | ||
670 | /** | |
671 | * srp_free_req() - Unmap data and add request to the free request list. | |
672 | */ | |
673 | static void srp_free_req(struct srp_target_port *target, | |
674 | struct srp_request *req, struct scsi_cmnd *scmnd, | |
675 | s32 req_lim_delta) | |
526b4caa | 676 | { |
94a9174c BVA |
677 | unsigned long flags; |
678 | ||
22032991 BVA |
679 | srp_unmap_data(scmnd, target, req); |
680 | ||
e9684678 | 681 | spin_lock_irqsave(&target->lock, flags); |
94a9174c | 682 | target->req_lim += req_lim_delta; |
536ae14e | 683 | list_add_tail(&req->list, &target->free_reqs); |
e9684678 | 684 | spin_unlock_irqrestore(&target->lock, flags); |
526b4caa IR |
685 | } |
686 | ||
687 | static void srp_reset_req(struct srp_target_port *target, struct srp_request *req) | |
688 | { | |
22032991 BVA |
689 | struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL); |
690 | ||
691 | if (scmnd) { | |
9b796d06 | 692 | srp_free_req(target, req, scmnd, 0); |
22032991 BVA |
693 | scmnd->result = DID_RESET << 16; |
694 | scmnd->scsi_done(scmnd); | |
22032991 | 695 | } |
526b4caa IR |
696 | } |
697 | ||
aef9ec39 RD |
698 | static int srp_reconnect_target(struct srp_target_port *target) |
699 | { | |
09be70a2 | 700 | struct Scsi_Host *shost = target->scsi_host; |
dcb4cb85 | 701 | int i, ret; |
aef9ec39 | 702 | |
09be70a2 | 703 | if (target->state != SRP_TARGET_LIVE) |
aef9ec39 | 704 | return -EAGAIN; |
aef9ec39 | 705 | |
09be70a2 BVA |
706 | scsi_target_block(&shost->shost_gendev); |
707 | ||
aef9ec39 RD |
708 | srp_disconnect_target(target); |
709 | /* | |
710 | * Now get a new local CM ID so that we avoid confusing the | |
711 | * target in case things are really fouled up. | |
712 | */ | |
9fe4bcf4 DD |
713 | ret = srp_new_cm_id(target); |
714 | if (ret) | |
09be70a2 | 715 | goto unblock; |
aef9ec39 | 716 | |
73aa89ed | 717 | ret = srp_create_target_ib(target); |
aef9ec39 | 718 | if (ret) |
09be70a2 | 719 | goto unblock; |
aef9ec39 | 720 | |
536ae14e BVA |
721 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { |
722 | struct srp_request *req = &target->req_ring[i]; | |
723 | if (req->scmnd) | |
724 | srp_reset_req(target, req); | |
725 | } | |
aef9ec39 | 726 | |
536ae14e | 727 | INIT_LIST_HEAD(&target->free_tx); |
dcb4cb85 | 728 | for (i = 0; i < SRP_SQ_SIZE; ++i) |
536ae14e | 729 | list_add(&target->tx_ring[i]->list, &target->free_tx); |
aef9ec39 RD |
730 | |
731 | ret = srp_connect_target(target); | |
09be70a2 BVA |
732 | |
733 | unblock: | |
734 | scsi_target_unblock(&shost->shost_gendev, ret == 0 ? SDEV_RUNNING : | |
735 | SDEV_TRANSPORT_OFFLINE); | |
736 | ||
aef9ec39 RD |
737 | if (ret) |
738 | goto err; | |
739 | ||
09be70a2 | 740 | shost_printk(KERN_INFO, target->scsi_host, PFX "reconnect succeeded\n"); |
aef9ec39 RD |
741 | |
742 | return ret; | |
743 | ||
744 | err: | |
7aa54bd7 DD |
745 | shost_printk(KERN_ERR, target->scsi_host, |
746 | PFX "reconnect failed (%d), removing target port.\n", ret); | |
aef9ec39 RD |
747 | |
748 | /* | |
749 | * We couldn't reconnect, so kill our target port off. | |
9709f0e0 BVA |
750 | * However, we have to defer the real removal because we |
751 | * are in the context of the SCSI error handler now, which | |
752 | * will deadlock if we call scsi_remove_host(). | |
aef9ec39 | 753 | */ |
ef6c49d8 | 754 | srp_queue_remove_work(target); |
aef9ec39 RD |
755 | |
756 | return ret; | |
757 | } | |
758 | ||
8f26c9ff DD |
759 | static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr, |
760 | unsigned int dma_len, u32 rkey) | |
f5358a17 | 761 | { |
8f26c9ff | 762 | struct srp_direct_buf *desc = state->desc; |
f5358a17 | 763 | |
8f26c9ff DD |
764 | desc->va = cpu_to_be64(dma_addr); |
765 | desc->key = cpu_to_be32(rkey); | |
766 | desc->len = cpu_to_be32(dma_len); | |
f5358a17 | 767 | |
8f26c9ff DD |
768 | state->total_len += dma_len; |
769 | state->desc++; | |
770 | state->ndesc++; | |
771 | } | |
559ce8f1 | 772 | |
8f26c9ff DD |
773 | static int srp_map_finish_fmr(struct srp_map_state *state, |
774 | struct srp_target_port *target) | |
775 | { | |
776 | struct srp_device *dev = target->srp_host->srp_dev; | |
777 | struct ib_pool_fmr *fmr; | |
778 | u64 io_addr = 0; | |
85507bcc | 779 | |
8f26c9ff DD |
780 | if (!state->npages) |
781 | return 0; | |
f5358a17 | 782 | |
8f26c9ff DD |
783 | if (state->npages == 1) { |
784 | srp_map_desc(state, state->base_dma_addr, state->fmr_len, | |
785 | target->rkey); | |
786 | state->npages = state->fmr_len = 0; | |
787 | return 0; | |
f5358a17 RD |
788 | } |
789 | ||
8f26c9ff DD |
790 | fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages, |
791 | state->npages, io_addr); | |
792 | if (IS_ERR(fmr)) | |
793 | return PTR_ERR(fmr); | |
f5358a17 | 794 | |
8f26c9ff DD |
795 | *state->next_fmr++ = fmr; |
796 | state->nfmr++; | |
f5358a17 | 797 | |
8f26c9ff DD |
798 | srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey); |
799 | state->npages = state->fmr_len = 0; | |
800 | return 0; | |
801 | } | |
802 | ||
803 | static void srp_map_update_start(struct srp_map_state *state, | |
804 | struct scatterlist *sg, int sg_index, | |
805 | dma_addr_t dma_addr) | |
806 | { | |
807 | state->unmapped_sg = sg; | |
808 | state->unmapped_index = sg_index; | |
809 | state->unmapped_addr = dma_addr; | |
810 | } | |
85507bcc | 811 | |
8f26c9ff DD |
812 | static int srp_map_sg_entry(struct srp_map_state *state, |
813 | struct srp_target_port *target, | |
814 | struct scatterlist *sg, int sg_index, | |
815 | int use_fmr) | |
816 | { | |
817 | struct srp_device *dev = target->srp_host->srp_dev; | |
818 | struct ib_device *ibdev = dev->dev; | |
819 | dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg); | |
820 | unsigned int dma_len = ib_sg_dma_len(ibdev, sg); | |
821 | unsigned int len; | |
822 | int ret; | |
823 | ||
824 | if (!dma_len) | |
825 | return 0; | |
826 | ||
827 | if (use_fmr == SRP_MAP_NO_FMR) { | |
828 | /* Once we're in direct map mode for a request, we don't | |
829 | * go back to FMR mode, so no need to update anything | |
830 | * other than the descriptor. | |
831 | */ | |
832 | srp_map_desc(state, dma_addr, dma_len, target->rkey); | |
833 | return 0; | |
85507bcc | 834 | } |
f5358a17 | 835 | |
8f26c9ff DD |
836 | /* If we start at an offset into the FMR page, don't merge into |
837 | * the current FMR. Finish it out, and use the kernel's MR for this | |
838 | * sg entry. This is to avoid potential bugs on some SRP targets | |
839 | * that were never quite defined, but went away when the initiator | |
840 | * avoided using FMR on such page fragments. | |
841 | */ | |
842 | if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) { | |
843 | ret = srp_map_finish_fmr(state, target); | |
844 | if (ret) | |
845 | return ret; | |
846 | ||
847 | srp_map_desc(state, dma_addr, dma_len, target->rkey); | |
848 | srp_map_update_start(state, NULL, 0, 0); | |
849 | return 0; | |
f5358a17 RD |
850 | } |
851 | ||
8f26c9ff DD |
852 | /* If this is the first sg to go into the FMR, save our position. |
853 | * We need to know the first unmapped entry, its index, and the | |
854 | * first unmapped address within that entry to be able to restart | |
855 | * mapping after an error. | |
856 | */ | |
857 | if (!state->unmapped_sg) | |
858 | srp_map_update_start(state, sg, sg_index, dma_addr); | |
f5358a17 | 859 | |
8f26c9ff DD |
860 | while (dma_len) { |
861 | if (state->npages == SRP_FMR_SIZE) { | |
862 | ret = srp_map_finish_fmr(state, target); | |
863 | if (ret) | |
864 | return ret; | |
f5358a17 | 865 | |
8f26c9ff DD |
866 | srp_map_update_start(state, sg, sg_index, dma_addr); |
867 | } | |
868 | ||
869 | len = min_t(unsigned int, dma_len, dev->fmr_page_size); | |
f5358a17 | 870 | |
8f26c9ff DD |
871 | if (!state->npages) |
872 | state->base_dma_addr = dma_addr; | |
873 | state->pages[state->npages++] = dma_addr; | |
874 | state->fmr_len += len; | |
875 | dma_addr += len; | |
876 | dma_len -= len; | |
877 | } | |
878 | ||
879 | /* If the last entry of the FMR wasn't a full page, then we need to | |
880 | * close it out and start a new one -- we can only merge at page | |
881 | * boundries. | |
882 | */ | |
883 | ret = 0; | |
884 | if (len != dev->fmr_page_size) { | |
885 | ret = srp_map_finish_fmr(state, target); | |
886 | if (!ret) | |
887 | srp_map_update_start(state, NULL, 0, 0); | |
888 | } | |
f5358a17 RD |
889 | return ret; |
890 | } | |
891 | ||
aef9ec39 RD |
892 | static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, |
893 | struct srp_request *req) | |
894 | { | |
8f26c9ff | 895 | struct scatterlist *scat, *sg; |
aef9ec39 | 896 | struct srp_cmd *cmd = req->cmd->buf; |
8f26c9ff | 897 | int i, len, nents, count, use_fmr; |
85507bcc RC |
898 | struct srp_device *dev; |
899 | struct ib_device *ibdev; | |
8f26c9ff DD |
900 | struct srp_map_state state; |
901 | struct srp_indirect_buf *indirect_hdr; | |
8f26c9ff DD |
902 | u32 table_len; |
903 | u8 fmt; | |
aef9ec39 | 904 | |
bb350d1d | 905 | if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE) |
aef9ec39 RD |
906 | return sizeof (struct srp_cmd); |
907 | ||
908 | if (scmnd->sc_data_direction != DMA_FROM_DEVICE && | |
909 | scmnd->sc_data_direction != DMA_TO_DEVICE) { | |
7aa54bd7 DD |
910 | shost_printk(KERN_WARNING, target->scsi_host, |
911 | PFX "Unhandled data direction %d\n", | |
912 | scmnd->sc_data_direction); | |
aef9ec39 RD |
913 | return -EINVAL; |
914 | } | |
915 | ||
bb350d1d FT |
916 | nents = scsi_sg_count(scmnd); |
917 | scat = scsi_sglist(scmnd); | |
aef9ec39 | 918 | |
05321937 | 919 | dev = target->srp_host->srp_dev; |
85507bcc RC |
920 | ibdev = dev->dev; |
921 | ||
922 | count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); | |
8f26c9ff DD |
923 | if (unlikely(count == 0)) |
924 | return -EIO; | |
f5358a17 RD |
925 | |
926 | fmt = SRP_DATA_DESC_DIRECT; | |
927 | len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); | |
aef9ec39 | 928 | |
cf368713 | 929 | if (count == 1) { |
f5358a17 RD |
930 | /* |
931 | * The midlayer only generated a single gather/scatter | |
932 | * entry, or DMA mapping coalesced everything to a | |
933 | * single entry. So a direct descriptor along with | |
934 | * the DMA MR suffices. | |
935 | */ | |
cf368713 | 936 | struct srp_direct_buf *buf = (void *) cmd->add_data; |
aef9ec39 | 937 | |
85507bcc | 938 | buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); |
9af76271 | 939 | buf->key = cpu_to_be32(target->rkey); |
85507bcc | 940 | buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); |
8f26c9ff DD |
941 | |
942 | req->nfmr = 0; | |
943 | goto map_complete; | |
944 | } | |
945 | ||
946 | /* We have more than one scatter/gather entry, so build our indirect | |
947 | * descriptor table, trying to merge as many entries with FMR as we | |
948 | * can. | |
949 | */ | |
950 | indirect_hdr = (void *) cmd->add_data; | |
951 | ||
c07d424d DD |
952 | ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr, |
953 | target->indirect_size, DMA_TO_DEVICE); | |
954 | ||
8f26c9ff | 955 | memset(&state, 0, sizeof(state)); |
c07d424d | 956 | state.desc = req->indirect_desc; |
8f26c9ff DD |
957 | state.pages = req->map_page; |
958 | state.next_fmr = req->fmr_list; | |
959 | ||
960 | use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR; | |
961 | ||
962 | for_each_sg(scat, sg, count, i) { | |
963 | if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) { | |
964 | /* FMR mapping failed, so backtrack to the first | |
965 | * unmapped entry and continue on without using FMR. | |
966 | */ | |
967 | dma_addr_t dma_addr; | |
968 | unsigned int dma_len; | |
969 | ||
970 | backtrack: | |
971 | sg = state.unmapped_sg; | |
972 | i = state.unmapped_index; | |
973 | ||
974 | dma_addr = ib_sg_dma_address(ibdev, sg); | |
975 | dma_len = ib_sg_dma_len(ibdev, sg); | |
976 | dma_len -= (state.unmapped_addr - dma_addr); | |
977 | dma_addr = state.unmapped_addr; | |
978 | use_fmr = SRP_MAP_NO_FMR; | |
979 | srp_map_desc(&state, dma_addr, dma_len, target->rkey); | |
f5358a17 | 980 | } |
8f26c9ff | 981 | } |
aef9ec39 | 982 | |
8f26c9ff DD |
983 | if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target)) |
984 | goto backtrack; | |
cf368713 | 985 | |
c07d424d DD |
986 | /* We've mapped the request, now pull as much of the indirect |
987 | * descriptor table as we can into the command buffer. If this | |
988 | * target is not using an external indirect table, we are | |
989 | * guaranteed to fit into the command, as the SCSI layer won't | |
990 | * give us more S/G entries than we allow. | |
8f26c9ff DD |
991 | */ |
992 | req->nfmr = state.nfmr; | |
993 | if (state.ndesc == 1) { | |
994 | /* FMR mapping was able to collapse this to one entry, | |
995 | * so use a direct descriptor. | |
996 | */ | |
997 | struct srp_direct_buf *buf = (void *) cmd->add_data; | |
cf368713 | 998 | |
c07d424d | 999 | *buf = req->indirect_desc[0]; |
8f26c9ff | 1000 | goto map_complete; |
aef9ec39 RD |
1001 | } |
1002 | ||
c07d424d DD |
1003 | if (unlikely(target->cmd_sg_cnt < state.ndesc && |
1004 | !target->allow_ext_sg)) { | |
1005 | shost_printk(KERN_ERR, target->scsi_host, | |
1006 | "Could not fit S/G list into SRP_CMD\n"); | |
1007 | return -EIO; | |
1008 | } | |
1009 | ||
1010 | count = min(state.ndesc, target->cmd_sg_cnt); | |
8f26c9ff DD |
1011 | table_len = state.ndesc * sizeof (struct srp_direct_buf); |
1012 | ||
1013 | fmt = SRP_DATA_DESC_INDIRECT; | |
1014 | len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf); | |
c07d424d | 1015 | len += count * sizeof (struct srp_direct_buf); |
8f26c9ff | 1016 | |
c07d424d DD |
1017 | memcpy(indirect_hdr->desc_list, req->indirect_desc, |
1018 | count * sizeof (struct srp_direct_buf)); | |
8f26c9ff | 1019 | |
c07d424d | 1020 | indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr); |
8f26c9ff DD |
1021 | indirect_hdr->table_desc.key = cpu_to_be32(target->rkey); |
1022 | indirect_hdr->table_desc.len = cpu_to_be32(table_len); | |
1023 | indirect_hdr->len = cpu_to_be32(state.total_len); | |
1024 | ||
1025 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) | |
c07d424d | 1026 | cmd->data_out_desc_cnt = count; |
8f26c9ff | 1027 | else |
c07d424d DD |
1028 | cmd->data_in_desc_cnt = count; |
1029 | ||
1030 | ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len, | |
1031 | DMA_TO_DEVICE); | |
8f26c9ff DD |
1032 | |
1033 | map_complete: | |
aef9ec39 RD |
1034 | if (scmnd->sc_data_direction == DMA_TO_DEVICE) |
1035 | cmd->buf_fmt = fmt << 4; | |
1036 | else | |
1037 | cmd->buf_fmt = fmt; | |
1038 | ||
aef9ec39 RD |
1039 | return len; |
1040 | } | |
1041 | ||
76c75b25 BVA |
1042 | /* |
1043 | * Return an IU and possible credit to the free pool | |
1044 | */ | |
1045 | static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu, | |
1046 | enum srp_iu_type iu_type) | |
1047 | { | |
1048 | unsigned long flags; | |
1049 | ||
e9684678 | 1050 | spin_lock_irqsave(&target->lock, flags); |
76c75b25 BVA |
1051 | list_add(&iu->list, &target->free_tx); |
1052 | if (iu_type != SRP_IU_RSP) | |
1053 | ++target->req_lim; | |
e9684678 | 1054 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 BVA |
1055 | } |
1056 | ||
05a1d750 | 1057 | /* |
e9684678 BVA |
1058 | * Must be called with target->lock held to protect req_lim and free_tx. |
1059 | * If IU is not sent, it must be returned using srp_put_tx_iu(). | |
05a1d750 DD |
1060 | * |
1061 | * Note: | |
1062 | * An upper limit for the number of allocated information units for each | |
1063 | * request type is: | |
1064 | * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues | |
1065 | * more than Scsi_Host.can_queue requests. | |
1066 | * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE. | |
1067 | * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than | |
1068 | * one unanswered SRP request to an initiator. | |
1069 | */ | |
1070 | static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target, | |
1071 | enum srp_iu_type iu_type) | |
1072 | { | |
1073 | s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE; | |
1074 | struct srp_iu *iu; | |
1075 | ||
1076 | srp_send_completion(target->send_cq, target); | |
1077 | ||
dcb4cb85 | 1078 | if (list_empty(&target->free_tx)) |
05a1d750 DD |
1079 | return NULL; |
1080 | ||
1081 | /* Initiator responses to target requests do not consume credits */ | |
76c75b25 BVA |
1082 | if (iu_type != SRP_IU_RSP) { |
1083 | if (target->req_lim <= rsv) { | |
1084 | ++target->zero_req_lim; | |
1085 | return NULL; | |
1086 | } | |
1087 | ||
1088 | --target->req_lim; | |
05a1d750 DD |
1089 | } |
1090 | ||
dcb4cb85 | 1091 | iu = list_first_entry(&target->free_tx, struct srp_iu, list); |
76c75b25 | 1092 | list_del(&iu->list); |
05a1d750 DD |
1093 | return iu; |
1094 | } | |
1095 | ||
76c75b25 BVA |
1096 | static int srp_post_send(struct srp_target_port *target, |
1097 | struct srp_iu *iu, int len) | |
05a1d750 DD |
1098 | { |
1099 | struct ib_sge list; | |
1100 | struct ib_send_wr wr, *bad_wr; | |
05a1d750 DD |
1101 | |
1102 | list.addr = iu->dma; | |
1103 | list.length = len; | |
9af76271 | 1104 | list.lkey = target->lkey; |
05a1d750 DD |
1105 | |
1106 | wr.next = NULL; | |
dcb4cb85 | 1107 | wr.wr_id = (uintptr_t) iu; |
05a1d750 DD |
1108 | wr.sg_list = &list; |
1109 | wr.num_sge = 1; | |
1110 | wr.opcode = IB_WR_SEND; | |
1111 | wr.send_flags = IB_SEND_SIGNALED; | |
1112 | ||
76c75b25 | 1113 | return ib_post_send(target->qp, &wr, &bad_wr); |
05a1d750 DD |
1114 | } |
1115 | ||
dcb4cb85 | 1116 | static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu) |
c996bb47 | 1117 | { |
c996bb47 | 1118 | struct ib_recv_wr wr, *bad_wr; |
dcb4cb85 | 1119 | struct ib_sge list; |
c996bb47 BVA |
1120 | |
1121 | list.addr = iu->dma; | |
1122 | list.length = iu->size; | |
9af76271 | 1123 | list.lkey = target->lkey; |
c996bb47 BVA |
1124 | |
1125 | wr.next = NULL; | |
dcb4cb85 | 1126 | wr.wr_id = (uintptr_t) iu; |
c996bb47 BVA |
1127 | wr.sg_list = &list; |
1128 | wr.num_sge = 1; | |
1129 | ||
dcb4cb85 | 1130 | return ib_post_recv(target->qp, &wr, &bad_wr); |
c996bb47 BVA |
1131 | } |
1132 | ||
aef9ec39 RD |
1133 | static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) |
1134 | { | |
1135 | struct srp_request *req; | |
1136 | struct scsi_cmnd *scmnd; | |
1137 | unsigned long flags; | |
aef9ec39 | 1138 | |
aef9ec39 | 1139 | if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { |
e9684678 | 1140 | spin_lock_irqsave(&target->lock, flags); |
94a9174c | 1141 | target->req_lim += be32_to_cpu(rsp->req_lim_delta); |
e9684678 | 1142 | spin_unlock_irqrestore(&target->lock, flags); |
94a9174c | 1143 | |
f8b6e31e DD |
1144 | target->tsk_mgmt_status = -1; |
1145 | if (be32_to_cpu(rsp->resp_data_len) >= 4) | |
1146 | target->tsk_mgmt_status = rsp->data[3]; | |
1147 | complete(&target->tsk_mgmt_done); | |
aef9ec39 | 1148 | } else { |
f8b6e31e | 1149 | req = &target->req_ring[rsp->tag]; |
22032991 BVA |
1150 | scmnd = srp_claim_req(target, req, NULL); |
1151 | if (!scmnd) { | |
7aa54bd7 DD |
1152 | shost_printk(KERN_ERR, target->scsi_host, |
1153 | "Null scmnd for RSP w/tag %016llx\n", | |
1154 | (unsigned long long) rsp->tag); | |
22032991 BVA |
1155 | |
1156 | spin_lock_irqsave(&target->lock, flags); | |
1157 | target->req_lim += be32_to_cpu(rsp->req_lim_delta); | |
1158 | spin_unlock_irqrestore(&target->lock, flags); | |
1159 | ||
1160 | return; | |
1161 | } | |
aef9ec39 RD |
1162 | scmnd->result = rsp->status; |
1163 | ||
1164 | if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { | |
1165 | memcpy(scmnd->sense_buffer, rsp->data + | |
1166 | be32_to_cpu(rsp->resp_data_len), | |
1167 | min_t(int, be32_to_cpu(rsp->sense_data_len), | |
1168 | SCSI_SENSE_BUFFERSIZE)); | |
1169 | } | |
1170 | ||
1171 | if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) | |
bb350d1d | 1172 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); |
aef9ec39 | 1173 | else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) |
bb350d1d | 1174 | scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
aef9ec39 | 1175 | |
22032991 BVA |
1176 | srp_free_req(target, req, scmnd, |
1177 | be32_to_cpu(rsp->req_lim_delta)); | |
1178 | ||
f8b6e31e DD |
1179 | scmnd->host_scribble = NULL; |
1180 | scmnd->scsi_done(scmnd); | |
aef9ec39 | 1181 | } |
aef9ec39 RD |
1182 | } |
1183 | ||
bb12588a DD |
1184 | static int srp_response_common(struct srp_target_port *target, s32 req_delta, |
1185 | void *rsp, int len) | |
1186 | { | |
76c75b25 | 1187 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
bb12588a DD |
1188 | unsigned long flags; |
1189 | struct srp_iu *iu; | |
76c75b25 | 1190 | int err; |
bb12588a | 1191 | |
e9684678 | 1192 | spin_lock_irqsave(&target->lock, flags); |
bb12588a | 1193 | target->req_lim += req_delta; |
bb12588a | 1194 | iu = __srp_get_tx_iu(target, SRP_IU_RSP); |
e9684678 | 1195 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 | 1196 | |
bb12588a DD |
1197 | if (!iu) { |
1198 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1199 | "no IU available to send response\n"); | |
76c75b25 | 1200 | return 1; |
bb12588a DD |
1201 | } |
1202 | ||
1203 | ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE); | |
1204 | memcpy(iu->buf, rsp, len); | |
1205 | ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE); | |
1206 | ||
76c75b25 BVA |
1207 | err = srp_post_send(target, iu, len); |
1208 | if (err) { | |
bb12588a DD |
1209 | shost_printk(KERN_ERR, target->scsi_host, PFX |
1210 | "unable to post response: %d\n", err); | |
76c75b25 BVA |
1211 | srp_put_tx_iu(target, iu, SRP_IU_RSP); |
1212 | } | |
bb12588a | 1213 | |
bb12588a DD |
1214 | return err; |
1215 | } | |
1216 | ||
1217 | static void srp_process_cred_req(struct srp_target_port *target, | |
1218 | struct srp_cred_req *req) | |
1219 | { | |
1220 | struct srp_cred_rsp rsp = { | |
1221 | .opcode = SRP_CRED_RSP, | |
1222 | .tag = req->tag, | |
1223 | }; | |
1224 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
1225 | ||
1226 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1227 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1228 | "problems processing SRP_CRED_REQ\n"); | |
1229 | } | |
1230 | ||
1231 | static void srp_process_aer_req(struct srp_target_port *target, | |
1232 | struct srp_aer_req *req) | |
1233 | { | |
1234 | struct srp_aer_rsp rsp = { | |
1235 | .opcode = SRP_AER_RSP, | |
1236 | .tag = req->tag, | |
1237 | }; | |
1238 | s32 delta = be32_to_cpu(req->req_lim_delta); | |
1239 | ||
1240 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1241 | "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun)); | |
1242 | ||
1243 | if (srp_response_common(target, delta, &rsp, sizeof rsp)) | |
1244 | shost_printk(KERN_ERR, target->scsi_host, PFX | |
1245 | "problems processing SRP_AER_REQ\n"); | |
1246 | } | |
1247 | ||
aef9ec39 RD |
1248 | static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) |
1249 | { | |
dcb4cb85 | 1250 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
737b94eb | 1251 | struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id; |
c996bb47 | 1252 | int res; |
aef9ec39 RD |
1253 | u8 opcode; |
1254 | ||
85507bcc RC |
1255 | ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, |
1256 | DMA_FROM_DEVICE); | |
aef9ec39 RD |
1257 | |
1258 | opcode = *(u8 *) iu->buf; | |
1259 | ||
1260 | if (0) { | |
7aa54bd7 DD |
1261 | shost_printk(KERN_ERR, target->scsi_host, |
1262 | PFX "recv completion, opcode 0x%02x\n", opcode); | |
7a700811 BVA |
1263 | print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1, |
1264 | iu->buf, wc->byte_len, true); | |
aef9ec39 RD |
1265 | } |
1266 | ||
1267 | switch (opcode) { | |
1268 | case SRP_RSP: | |
1269 | srp_process_rsp(target, iu->buf); | |
1270 | break; | |
1271 | ||
bb12588a DD |
1272 | case SRP_CRED_REQ: |
1273 | srp_process_cred_req(target, iu->buf); | |
1274 | break; | |
1275 | ||
1276 | case SRP_AER_REQ: | |
1277 | srp_process_aer_req(target, iu->buf); | |
1278 | break; | |
1279 | ||
aef9ec39 RD |
1280 | case SRP_T_LOGOUT: |
1281 | /* XXX Handle target logout */ | |
7aa54bd7 DD |
1282 | shost_printk(KERN_WARNING, target->scsi_host, |
1283 | PFX "Got target logout request\n"); | |
aef9ec39 RD |
1284 | break; |
1285 | ||
1286 | default: | |
7aa54bd7 DD |
1287 | shost_printk(KERN_WARNING, target->scsi_host, |
1288 | PFX "Unhandled SRP opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1289 | break; |
1290 | } | |
1291 | ||
85507bcc RC |
1292 | ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, |
1293 | DMA_FROM_DEVICE); | |
c996bb47 | 1294 | |
dcb4cb85 | 1295 | res = srp_post_recv(target, iu); |
c996bb47 BVA |
1296 | if (res != 0) |
1297 | shost_printk(KERN_ERR, target->scsi_host, | |
1298 | PFX "Recv failed with error code %d\n", res); | |
aef9ec39 RD |
1299 | } |
1300 | ||
948d1e88 BVA |
1301 | static void srp_handle_qp_err(enum ib_wc_status wc_status, |
1302 | enum ib_wc_opcode wc_opcode, | |
1303 | struct srp_target_port *target) | |
1304 | { | |
294c875a | 1305 | if (target->connected && !target->qp_in_error) { |
4f0af697 BVA |
1306 | shost_printk(KERN_ERR, target->scsi_host, |
1307 | PFX "failed %s status %d\n", | |
1308 | wc_opcode & IB_WC_RECV ? "receive" : "send", | |
1309 | wc_status); | |
1310 | } | |
948d1e88 BVA |
1311 | target->qp_in_error = true; |
1312 | } | |
1313 | ||
9c03dc9f | 1314 | static void srp_recv_completion(struct ib_cq *cq, void *target_ptr) |
aef9ec39 RD |
1315 | { |
1316 | struct srp_target_port *target = target_ptr; | |
1317 | struct ib_wc wc; | |
aef9ec39 RD |
1318 | |
1319 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
1320 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
948d1e88 BVA |
1321 | if (likely(wc.status == IB_WC_SUCCESS)) { |
1322 | srp_handle_recv(target, &wc); | |
1323 | } else { | |
1324 | srp_handle_qp_err(wc.status, wc.opcode, target); | |
aef9ec39 | 1325 | } |
9c03dc9f BVA |
1326 | } |
1327 | } | |
1328 | ||
1329 | static void srp_send_completion(struct ib_cq *cq, void *target_ptr) | |
1330 | { | |
1331 | struct srp_target_port *target = target_ptr; | |
1332 | struct ib_wc wc; | |
dcb4cb85 | 1333 | struct srp_iu *iu; |
9c03dc9f BVA |
1334 | |
1335 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
948d1e88 BVA |
1336 | if (likely(wc.status == IB_WC_SUCCESS)) { |
1337 | iu = (struct srp_iu *) (uintptr_t) wc.wr_id; | |
1338 | list_add(&iu->list, &target->free_tx); | |
1339 | } else { | |
1340 | srp_handle_qp_err(wc.status, wc.opcode, target); | |
9c03dc9f | 1341 | } |
aef9ec39 RD |
1342 | } |
1343 | } | |
1344 | ||
76c75b25 | 1345 | static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd) |
aef9ec39 | 1346 | { |
76c75b25 | 1347 | struct srp_target_port *target = host_to_target(shost); |
aef9ec39 RD |
1348 | struct srp_request *req; |
1349 | struct srp_iu *iu; | |
1350 | struct srp_cmd *cmd; | |
85507bcc | 1351 | struct ib_device *dev; |
76c75b25 | 1352 | unsigned long flags; |
aef9ec39 RD |
1353 | int len; |
1354 | ||
e9684678 | 1355 | spin_lock_irqsave(&target->lock, flags); |
bb12588a | 1356 | iu = __srp_get_tx_iu(target, SRP_IU_CMD); |
aef9ec39 | 1357 | if (!iu) |
695b8349 BVA |
1358 | goto err_unlock; |
1359 | ||
1360 | req = list_first_entry(&target->free_reqs, struct srp_request, list); | |
1361 | list_del(&req->list); | |
1362 | spin_unlock_irqrestore(&target->lock, flags); | |
aef9ec39 | 1363 | |
05321937 | 1364 | dev = target->srp_host->srp_dev->dev; |
49248644 | 1365 | ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len, |
85507bcc | 1366 | DMA_TO_DEVICE); |
aef9ec39 | 1367 | |
aef9ec39 | 1368 | scmnd->result = 0; |
f8b6e31e | 1369 | scmnd->host_scribble = (void *) req; |
aef9ec39 RD |
1370 | |
1371 | cmd = iu->buf; | |
1372 | memset(cmd, 0, sizeof *cmd); | |
1373 | ||
1374 | cmd->opcode = SRP_CMD; | |
1375 | cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); | |
d945e1df | 1376 | cmd->tag = req->index; |
aef9ec39 RD |
1377 | memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); |
1378 | ||
aef9ec39 RD |
1379 | req->scmnd = scmnd; |
1380 | req->cmd = iu; | |
aef9ec39 RD |
1381 | |
1382 | len = srp_map_data(scmnd, target, req); | |
1383 | if (len < 0) { | |
7aa54bd7 DD |
1384 | shost_printk(KERN_ERR, target->scsi_host, |
1385 | PFX "Failed to map data\n"); | |
76c75b25 | 1386 | goto err_iu; |
aef9ec39 RD |
1387 | } |
1388 | ||
49248644 | 1389 | ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len, |
85507bcc | 1390 | DMA_TO_DEVICE); |
aef9ec39 | 1391 | |
76c75b25 | 1392 | if (srp_post_send(target, iu, len)) { |
7aa54bd7 | 1393 | shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n"); |
aef9ec39 RD |
1394 | goto err_unmap; |
1395 | } | |
1396 | ||
aef9ec39 RD |
1397 | return 0; |
1398 | ||
1399 | err_unmap: | |
1400 | srp_unmap_data(scmnd, target, req); | |
1401 | ||
76c75b25 BVA |
1402 | err_iu: |
1403 | srp_put_tx_iu(target, iu, SRP_IU_CMD); | |
1404 | ||
e9684678 | 1405 | spin_lock_irqsave(&target->lock, flags); |
76c75b25 | 1406 | list_add(&req->list, &target->free_reqs); |
695b8349 BVA |
1407 | |
1408 | err_unlock: | |
e9684678 | 1409 | spin_unlock_irqrestore(&target->lock, flags); |
76c75b25 | 1410 | |
aef9ec39 RD |
1411 | return SCSI_MLQUEUE_HOST_BUSY; |
1412 | } | |
1413 | ||
1414 | static int srp_alloc_iu_bufs(struct srp_target_port *target) | |
1415 | { | |
1416 | int i; | |
1417 | ||
1418 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1419 | target->rx_ring[i] = srp_alloc_iu(target->srp_host, | |
1420 | target->max_ti_iu_len, | |
1421 | GFP_KERNEL, DMA_FROM_DEVICE); | |
1422 | if (!target->rx_ring[i]) | |
1423 | goto err; | |
1424 | } | |
1425 | ||
dd5e6e38 | 1426 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
aef9ec39 | 1427 | target->tx_ring[i] = srp_alloc_iu(target->srp_host, |
49248644 | 1428 | target->max_iu_len, |
aef9ec39 RD |
1429 | GFP_KERNEL, DMA_TO_DEVICE); |
1430 | if (!target->tx_ring[i]) | |
1431 | goto err; | |
dcb4cb85 BVA |
1432 | |
1433 | list_add(&target->tx_ring[i]->list, &target->free_tx); | |
aef9ec39 RD |
1434 | } |
1435 | ||
1436 | return 0; | |
1437 | ||
1438 | err: | |
1439 | for (i = 0; i < SRP_RQ_SIZE; ++i) { | |
1440 | srp_free_iu(target->srp_host, target->rx_ring[i]); | |
1441 | target->rx_ring[i] = NULL; | |
1442 | } | |
1443 | ||
dd5e6e38 | 1444 | for (i = 0; i < SRP_SQ_SIZE; ++i) { |
aef9ec39 RD |
1445 | srp_free_iu(target->srp_host, target->tx_ring[i]); |
1446 | target->tx_ring[i] = NULL; | |
1447 | } | |
1448 | ||
1449 | return -ENOMEM; | |
1450 | } | |
1451 | ||
c9b03c1a BVA |
1452 | static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask) |
1453 | { | |
1454 | uint64_t T_tr_ns, max_compl_time_ms; | |
1455 | uint32_t rq_tmo_jiffies; | |
1456 | ||
1457 | /* | |
1458 | * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair, | |
1459 | * table 91), both the QP timeout and the retry count have to be set | |
1460 | * for RC QP's during the RTR to RTS transition. | |
1461 | */ | |
1462 | WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) != | |
1463 | (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)); | |
1464 | ||
1465 | /* | |
1466 | * Set target->rq_tmo_jiffies to one second more than the largest time | |
1467 | * it can take before an error completion is generated. See also | |
1468 | * C9-140..142 in the IBTA spec for more information about how to | |
1469 | * convert the QP Local ACK Timeout value to nanoseconds. | |
1470 | */ | |
1471 | T_tr_ns = 4096 * (1ULL << qp_attr->timeout); | |
1472 | max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns; | |
1473 | do_div(max_compl_time_ms, NSEC_PER_MSEC); | |
1474 | rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000); | |
1475 | ||
1476 | return rq_tmo_jiffies; | |
1477 | } | |
1478 | ||
961e0be8 DD |
1479 | static void srp_cm_rep_handler(struct ib_cm_id *cm_id, |
1480 | struct srp_login_rsp *lrsp, | |
1481 | struct srp_target_port *target) | |
1482 | { | |
1483 | struct ib_qp_attr *qp_attr = NULL; | |
1484 | int attr_mask = 0; | |
1485 | int ret; | |
1486 | int i; | |
1487 | ||
1488 | if (lrsp->opcode == SRP_LOGIN_RSP) { | |
1489 | target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len); | |
1490 | target->req_lim = be32_to_cpu(lrsp->req_lim_delta); | |
1491 | ||
1492 | /* | |
1493 | * Reserve credits for task management so we don't | |
1494 | * bounce requests back to the SCSI mid-layer. | |
1495 | */ | |
1496 | target->scsi_host->can_queue | |
1497 | = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE, | |
1498 | target->scsi_host->can_queue); | |
1499 | } else { | |
1500 | shost_printk(KERN_WARNING, target->scsi_host, | |
1501 | PFX "Unhandled RSP opcode %#x\n", lrsp->opcode); | |
1502 | ret = -ECONNRESET; | |
1503 | goto error; | |
1504 | } | |
1505 | ||
1506 | if (!target->rx_ring[0]) { | |
1507 | ret = srp_alloc_iu_bufs(target); | |
1508 | if (ret) | |
1509 | goto error; | |
1510 | } | |
1511 | ||
1512 | ret = -ENOMEM; | |
1513 | qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); | |
1514 | if (!qp_attr) | |
1515 | goto error; | |
1516 | ||
1517 | qp_attr->qp_state = IB_QPS_RTR; | |
1518 | ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1519 | if (ret) | |
1520 | goto error_free; | |
1521 | ||
1522 | ret = ib_modify_qp(target->qp, qp_attr, attr_mask); | |
1523 | if (ret) | |
1524 | goto error_free; | |
1525 | ||
1526 | for (i = 0; i < SRP_RQ_SIZE; i++) { | |
1527 | struct srp_iu *iu = target->rx_ring[i]; | |
1528 | ret = srp_post_recv(target, iu); | |
1529 | if (ret) | |
1530 | goto error_free; | |
1531 | } | |
1532 | ||
1533 | qp_attr->qp_state = IB_QPS_RTS; | |
1534 | ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); | |
1535 | if (ret) | |
1536 | goto error_free; | |
1537 | ||
c9b03c1a BVA |
1538 | target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask); |
1539 | ||
961e0be8 DD |
1540 | ret = ib_modify_qp(target->qp, qp_attr, attr_mask); |
1541 | if (ret) | |
1542 | goto error_free; | |
1543 | ||
1544 | ret = ib_send_cm_rtu(cm_id, NULL, 0); | |
1545 | ||
1546 | error_free: | |
1547 | kfree(qp_attr); | |
1548 | ||
1549 | error: | |
1550 | target->status = ret; | |
1551 | } | |
1552 | ||
aef9ec39 RD |
1553 | static void srp_cm_rej_handler(struct ib_cm_id *cm_id, |
1554 | struct ib_cm_event *event, | |
1555 | struct srp_target_port *target) | |
1556 | { | |
7aa54bd7 | 1557 | struct Scsi_Host *shost = target->scsi_host; |
aef9ec39 RD |
1558 | struct ib_class_port_info *cpi; |
1559 | int opcode; | |
1560 | ||
1561 | switch (event->param.rej_rcvd.reason) { | |
1562 | case IB_CM_REJ_PORT_CM_REDIRECT: | |
1563 | cpi = event->param.rej_rcvd.ari; | |
1564 | target->path.dlid = cpi->redirect_lid; | |
1565 | target->path.pkey = cpi->redirect_pkey; | |
1566 | cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; | |
1567 | memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); | |
1568 | ||
1569 | target->status = target->path.dlid ? | |
1570 | SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; | |
1571 | break; | |
1572 | ||
1573 | case IB_CM_REJ_PORT_REDIRECT: | |
5d7cbfd6 | 1574 | if (srp_target_is_topspin(target)) { |
aef9ec39 RD |
1575 | /* |
1576 | * Topspin/Cisco SRP gateways incorrectly send | |
1577 | * reject reason code 25 when they mean 24 | |
1578 | * (port redirect). | |
1579 | */ | |
1580 | memcpy(target->path.dgid.raw, | |
1581 | event->param.rej_rcvd.ari, 16); | |
1582 | ||
7aa54bd7 DD |
1583 | shost_printk(KERN_DEBUG, shost, |
1584 | PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", | |
1585 | (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), | |
1586 | (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); | |
aef9ec39 RD |
1587 | |
1588 | target->status = SRP_PORT_REDIRECT; | |
1589 | } else { | |
7aa54bd7 DD |
1590 | shost_printk(KERN_WARNING, shost, |
1591 | " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); | |
aef9ec39 RD |
1592 | target->status = -ECONNRESET; |
1593 | } | |
1594 | break; | |
1595 | ||
1596 | case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: | |
7aa54bd7 DD |
1597 | shost_printk(KERN_WARNING, shost, |
1598 | " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); | |
aef9ec39 RD |
1599 | target->status = -ECONNRESET; |
1600 | break; | |
1601 | ||
1602 | case IB_CM_REJ_CONSUMER_DEFINED: | |
1603 | opcode = *(u8 *) event->private_data; | |
1604 | if (opcode == SRP_LOGIN_REJ) { | |
1605 | struct srp_login_rej *rej = event->private_data; | |
1606 | u32 reason = be32_to_cpu(rej->reason); | |
1607 | ||
1608 | if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) | |
7aa54bd7 DD |
1609 | shost_printk(KERN_WARNING, shost, |
1610 | PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); | |
aef9ec39 | 1611 | else |
7aa54bd7 DD |
1612 | shost_printk(KERN_WARNING, shost, |
1613 | PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason); | |
aef9ec39 | 1614 | } else |
7aa54bd7 DD |
1615 | shost_printk(KERN_WARNING, shost, |
1616 | " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," | |
1617 | " opcode 0x%02x\n", opcode); | |
aef9ec39 RD |
1618 | target->status = -ECONNRESET; |
1619 | break; | |
1620 | ||
9fe4bcf4 DD |
1621 | case IB_CM_REJ_STALE_CONN: |
1622 | shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n"); | |
1623 | target->status = SRP_STALE_CONN; | |
1624 | break; | |
1625 | ||
aef9ec39 | 1626 | default: |
7aa54bd7 DD |
1627 | shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n", |
1628 | event->param.rej_rcvd.reason); | |
aef9ec39 RD |
1629 | target->status = -ECONNRESET; |
1630 | } | |
1631 | } | |
1632 | ||
1633 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
1634 | { | |
1635 | struct srp_target_port *target = cm_id->context; | |
aef9ec39 | 1636 | int comp = 0; |
aef9ec39 RD |
1637 | |
1638 | switch (event->event) { | |
1639 | case IB_CM_REQ_ERROR: | |
7aa54bd7 DD |
1640 | shost_printk(KERN_DEBUG, target->scsi_host, |
1641 | PFX "Sending CM REQ failed\n"); | |
aef9ec39 RD |
1642 | comp = 1; |
1643 | target->status = -ECONNRESET; | |
1644 | break; | |
1645 | ||
1646 | case IB_CM_REP_RECEIVED: | |
1647 | comp = 1; | |
961e0be8 | 1648 | srp_cm_rep_handler(cm_id, event->private_data, target); |
aef9ec39 RD |
1649 | break; |
1650 | ||
1651 | case IB_CM_REJ_RECEIVED: | |
7aa54bd7 | 1652 | shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n"); |
aef9ec39 RD |
1653 | comp = 1; |
1654 | ||
1655 | srp_cm_rej_handler(cm_id, event, target); | |
1656 | break; | |
1657 | ||
b7ac4ab4 | 1658 | case IB_CM_DREQ_RECEIVED: |
7aa54bd7 DD |
1659 | shost_printk(KERN_WARNING, target->scsi_host, |
1660 | PFX "DREQ received - connection closed\n"); | |
294c875a | 1661 | srp_change_conn_state(target, false); |
b7ac4ab4 | 1662 | if (ib_send_cm_drep(cm_id, NULL, 0)) |
7aa54bd7 DD |
1663 | shost_printk(KERN_ERR, target->scsi_host, |
1664 | PFX "Sending CM DREP failed\n"); | |
aef9ec39 RD |
1665 | break; |
1666 | ||
1667 | case IB_CM_TIMEWAIT_EXIT: | |
7aa54bd7 DD |
1668 | shost_printk(KERN_ERR, target->scsi_host, |
1669 | PFX "connection closed\n"); | |
aef9ec39 | 1670 | |
aef9ec39 RD |
1671 | target->status = 0; |
1672 | break; | |
1673 | ||
b7ac4ab4 IR |
1674 | case IB_CM_MRA_RECEIVED: |
1675 | case IB_CM_DREQ_ERROR: | |
1676 | case IB_CM_DREP_RECEIVED: | |
1677 | break; | |
1678 | ||
aef9ec39 | 1679 | default: |
7aa54bd7 DD |
1680 | shost_printk(KERN_WARNING, target->scsi_host, |
1681 | PFX "Unhandled CM event %d\n", event->event); | |
aef9ec39 RD |
1682 | break; |
1683 | } | |
1684 | ||
1685 | if (comp) | |
1686 | complete(&target->done); | |
1687 | ||
aef9ec39 RD |
1688 | return 0; |
1689 | } | |
1690 | ||
d945e1df | 1691 | static int srp_send_tsk_mgmt(struct srp_target_port *target, |
f8b6e31e | 1692 | u64 req_tag, unsigned int lun, u8 func) |
aef9ec39 | 1693 | { |
19081f31 | 1694 | struct ib_device *dev = target->srp_host->srp_dev->dev; |
aef9ec39 RD |
1695 | struct srp_iu *iu; |
1696 | struct srp_tsk_mgmt *tsk_mgmt; | |
aef9ec39 | 1697 | |
f8b6e31e | 1698 | init_completion(&target->tsk_mgmt_done); |
aef9ec39 | 1699 | |
e9684678 | 1700 | spin_lock_irq(&target->lock); |
bb12588a | 1701 | iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT); |
e9684678 | 1702 | spin_unlock_irq(&target->lock); |
76c75b25 | 1703 | |
aef9ec39 | 1704 | if (!iu) |
76c75b25 | 1705 | return -1; |
aef9ec39 | 1706 | |
19081f31 DD |
1707 | ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt, |
1708 | DMA_TO_DEVICE); | |
aef9ec39 RD |
1709 | tsk_mgmt = iu->buf; |
1710 | memset(tsk_mgmt, 0, sizeof *tsk_mgmt); | |
1711 | ||
1712 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
f8b6e31e DD |
1713 | tsk_mgmt->lun = cpu_to_be64((u64) lun << 48); |
1714 | tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT; | |
aef9ec39 | 1715 | tsk_mgmt->tsk_mgmt_func = func; |
f8b6e31e | 1716 | tsk_mgmt->task_tag = req_tag; |
aef9ec39 | 1717 | |
19081f31 DD |
1718 | ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt, |
1719 | DMA_TO_DEVICE); | |
76c75b25 BVA |
1720 | if (srp_post_send(target, iu, sizeof *tsk_mgmt)) { |
1721 | srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT); | |
1722 | return -1; | |
1723 | } | |
d945e1df | 1724 | |
f8b6e31e | 1725 | if (!wait_for_completion_timeout(&target->tsk_mgmt_done, |
aef9ec39 | 1726 | msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) |
d945e1df | 1727 | return -1; |
aef9ec39 | 1728 | |
d945e1df | 1729 | return 0; |
d945e1df RD |
1730 | } |
1731 | ||
aef9ec39 RD |
1732 | static int srp_abort(struct scsi_cmnd *scmnd) |
1733 | { | |
d945e1df | 1734 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
f8b6e31e | 1735 | struct srp_request *req = (struct srp_request *) scmnd->host_scribble; |
d945e1df | 1736 | |
7aa54bd7 | 1737 | shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n"); |
aef9ec39 | 1738 | |
22032991 | 1739 | if (!req || target->qp_in_error || !srp_claim_req(target, req, scmnd)) |
d945e1df | 1740 | return FAILED; |
22032991 BVA |
1741 | srp_send_tsk_mgmt(target, req->index, scmnd->device->lun, |
1742 | SRP_TSK_ABORT_TASK); | |
1743 | srp_free_req(target, req, scmnd, 0); | |
1744 | scmnd->result = DID_ABORT << 16; | |
d8536670 | 1745 | scmnd->scsi_done(scmnd); |
d945e1df | 1746 | |
22032991 | 1747 | return SUCCESS; |
aef9ec39 RD |
1748 | } |
1749 | ||
1750 | static int srp_reset_device(struct scsi_cmnd *scmnd) | |
1751 | { | |
d945e1df | 1752 | struct srp_target_port *target = host_to_target(scmnd->device->host); |
536ae14e | 1753 | int i; |
d945e1df | 1754 | |
7aa54bd7 | 1755 | shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n"); |
aef9ec39 | 1756 | |
1033ff67 IR |
1757 | if (target->qp_in_error) |
1758 | return FAILED; | |
f8b6e31e DD |
1759 | if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun, |
1760 | SRP_TSK_LUN_RESET)) | |
d945e1df | 1761 | return FAILED; |
f8b6e31e | 1762 | if (target->tsk_mgmt_status) |
d945e1df RD |
1763 | return FAILED; |
1764 | ||
536ae14e BVA |
1765 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { |
1766 | struct srp_request *req = &target->req_ring[i]; | |
f8b6e31e | 1767 | if (req->scmnd && req->scmnd->device == scmnd->device) |
526b4caa | 1768 | srp_reset_req(target, req); |
536ae14e | 1769 | } |
d945e1df | 1770 | |
d945e1df | 1771 | return SUCCESS; |
aef9ec39 RD |
1772 | } |
1773 | ||
1774 | static int srp_reset_host(struct scsi_cmnd *scmnd) | |
1775 | { | |
1776 | struct srp_target_port *target = host_to_target(scmnd->device->host); | |
1777 | int ret = FAILED; | |
1778 | ||
7aa54bd7 | 1779 | shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n"); |
aef9ec39 RD |
1780 | |
1781 | if (!srp_reconnect_target(target)) | |
1782 | ret = SUCCESS; | |
1783 | ||
1784 | return ret; | |
1785 | } | |
1786 | ||
c9b03c1a BVA |
1787 | static int srp_slave_configure(struct scsi_device *sdev) |
1788 | { | |
1789 | struct Scsi_Host *shost = sdev->host; | |
1790 | struct srp_target_port *target = host_to_target(shost); | |
1791 | struct request_queue *q = sdev->request_queue; | |
1792 | unsigned long timeout; | |
1793 | ||
1794 | if (sdev->type == TYPE_DISK) { | |
1795 | timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies); | |
1796 | blk_queue_rq_timeout(q, timeout); | |
1797 | } | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
ee959b00 TJ |
1802 | static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr, |
1803 | char *buf) | |
6ecb0c84 | 1804 | { |
ee959b00 | 1805 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1806 | |
6ecb0c84 RD |
1807 | return sprintf(buf, "0x%016llx\n", |
1808 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1809 | } | |
1810 | ||
ee959b00 TJ |
1811 | static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr, |
1812 | char *buf) | |
6ecb0c84 | 1813 | { |
ee959b00 | 1814 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1815 | |
6ecb0c84 RD |
1816 | return sprintf(buf, "0x%016llx\n", |
1817 | (unsigned long long) be64_to_cpu(target->ioc_guid)); | |
1818 | } | |
1819 | ||
ee959b00 TJ |
1820 | static ssize_t show_service_id(struct device *dev, |
1821 | struct device_attribute *attr, char *buf) | |
6ecb0c84 | 1822 | { |
ee959b00 | 1823 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1824 | |
6ecb0c84 RD |
1825 | return sprintf(buf, "0x%016llx\n", |
1826 | (unsigned long long) be64_to_cpu(target->service_id)); | |
1827 | } | |
1828 | ||
ee959b00 TJ |
1829 | static ssize_t show_pkey(struct device *dev, struct device_attribute *attr, |
1830 | char *buf) | |
6ecb0c84 | 1831 | { |
ee959b00 | 1832 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1833 | |
6ecb0c84 RD |
1834 | return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); |
1835 | } | |
1836 | ||
ee959b00 TJ |
1837 | static ssize_t show_dgid(struct device *dev, struct device_attribute *attr, |
1838 | char *buf) | |
6ecb0c84 | 1839 | { |
ee959b00 | 1840 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6ecb0c84 | 1841 | |
5b095d98 | 1842 | return sprintf(buf, "%pI6\n", target->path.dgid.raw); |
6ecb0c84 RD |
1843 | } |
1844 | ||
ee959b00 TJ |
1845 | static ssize_t show_orig_dgid(struct device *dev, |
1846 | struct device_attribute *attr, char *buf) | |
3633b3d0 | 1847 | { |
ee959b00 | 1848 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
3633b3d0 | 1849 | |
5b095d98 | 1850 | return sprintf(buf, "%pI6\n", target->orig_dgid); |
3633b3d0 IR |
1851 | } |
1852 | ||
89de7486 BVA |
1853 | static ssize_t show_req_lim(struct device *dev, |
1854 | struct device_attribute *attr, char *buf) | |
1855 | { | |
1856 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1857 | ||
89de7486 BVA |
1858 | return sprintf(buf, "%d\n", target->req_lim); |
1859 | } | |
1860 | ||
ee959b00 TJ |
1861 | static ssize_t show_zero_req_lim(struct device *dev, |
1862 | struct device_attribute *attr, char *buf) | |
6bfa24fa | 1863 | { |
ee959b00 | 1864 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
6bfa24fa | 1865 | |
6bfa24fa RD |
1866 | return sprintf(buf, "%d\n", target->zero_req_lim); |
1867 | } | |
1868 | ||
ee959b00 TJ |
1869 | static ssize_t show_local_ib_port(struct device *dev, |
1870 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 1871 | { |
ee959b00 | 1872 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 IR |
1873 | |
1874 | return sprintf(buf, "%d\n", target->srp_host->port); | |
1875 | } | |
1876 | ||
ee959b00 TJ |
1877 | static ssize_t show_local_ib_device(struct device *dev, |
1878 | struct device_attribute *attr, char *buf) | |
ded7f1a1 | 1879 | { |
ee959b00 | 1880 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); |
ded7f1a1 | 1881 | |
05321937 | 1882 | return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name); |
ded7f1a1 IR |
1883 | } |
1884 | ||
49248644 DD |
1885 | static ssize_t show_cmd_sg_entries(struct device *dev, |
1886 | struct device_attribute *attr, char *buf) | |
1887 | { | |
1888 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1889 | ||
1890 | return sprintf(buf, "%u\n", target->cmd_sg_cnt); | |
1891 | } | |
1892 | ||
c07d424d DD |
1893 | static ssize_t show_allow_ext_sg(struct device *dev, |
1894 | struct device_attribute *attr, char *buf) | |
1895 | { | |
1896 | struct srp_target_port *target = host_to_target(class_to_shost(dev)); | |
1897 | ||
1898 | return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false"); | |
1899 | } | |
1900 | ||
ee959b00 TJ |
1901 | static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); |
1902 | static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); | |
1903 | static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); | |
1904 | static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); | |
1905 | static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); | |
1906 | static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL); | |
89de7486 | 1907 | static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL); |
ee959b00 TJ |
1908 | static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); |
1909 | static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); | |
1910 | static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); | |
49248644 | 1911 | static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL); |
c07d424d | 1912 | static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL); |
ee959b00 TJ |
1913 | |
1914 | static struct device_attribute *srp_host_attrs[] = { | |
1915 | &dev_attr_id_ext, | |
1916 | &dev_attr_ioc_guid, | |
1917 | &dev_attr_service_id, | |
1918 | &dev_attr_pkey, | |
1919 | &dev_attr_dgid, | |
1920 | &dev_attr_orig_dgid, | |
89de7486 | 1921 | &dev_attr_req_lim, |
ee959b00 TJ |
1922 | &dev_attr_zero_req_lim, |
1923 | &dev_attr_local_ib_port, | |
1924 | &dev_attr_local_ib_device, | |
49248644 | 1925 | &dev_attr_cmd_sg_entries, |
c07d424d | 1926 | &dev_attr_allow_ext_sg, |
6ecb0c84 RD |
1927 | NULL |
1928 | }; | |
1929 | ||
aef9ec39 RD |
1930 | static struct scsi_host_template srp_template = { |
1931 | .module = THIS_MODULE, | |
b7f008fd RD |
1932 | .name = "InfiniBand SRP initiator", |
1933 | .proc_name = DRV_NAME, | |
c9b03c1a | 1934 | .slave_configure = srp_slave_configure, |
aef9ec39 RD |
1935 | .info = srp_target_info, |
1936 | .queuecommand = srp_queuecommand, | |
1937 | .eh_abort_handler = srp_abort, | |
1938 | .eh_device_reset_handler = srp_reset_device, | |
1939 | .eh_host_reset_handler = srp_reset_host, | |
49248644 | 1940 | .sg_tablesize = SRP_DEF_SG_TABLESIZE, |
dd5e6e38 | 1941 | .can_queue = SRP_CMD_SQ_SIZE, |
aef9ec39 | 1942 | .this_id = -1, |
dd5e6e38 | 1943 | .cmd_per_lun = SRP_CMD_SQ_SIZE, |
6ecb0c84 RD |
1944 | .use_clustering = ENABLE_CLUSTERING, |
1945 | .shost_attrs = srp_host_attrs | |
aef9ec39 RD |
1946 | }; |
1947 | ||
1948 | static int srp_add_target(struct srp_host *host, struct srp_target_port *target) | |
1949 | { | |
3236822b FT |
1950 | struct srp_rport_identifiers ids; |
1951 | struct srp_rport *rport; | |
1952 | ||
aef9ec39 RD |
1953 | sprintf(target->target_name, "SRP.T10:%016llX", |
1954 | (unsigned long long) be64_to_cpu(target->id_ext)); | |
1955 | ||
05321937 | 1956 | if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device)) |
aef9ec39 RD |
1957 | return -ENODEV; |
1958 | ||
3236822b FT |
1959 | memcpy(ids.port_id, &target->id_ext, 8); |
1960 | memcpy(ids.port_id + 8, &target->ioc_guid, 8); | |
aebd5e47 | 1961 | ids.roles = SRP_RPORT_ROLE_TARGET; |
3236822b FT |
1962 | rport = srp_rport_add(target->scsi_host, &ids); |
1963 | if (IS_ERR(rport)) { | |
1964 | scsi_remove_host(target->scsi_host); | |
1965 | return PTR_ERR(rport); | |
1966 | } | |
1967 | ||
dc1bdbd9 BVA |
1968 | rport->lld_data = target; |
1969 | ||
b3589fd4 | 1970 | spin_lock(&host->target_lock); |
aef9ec39 | 1971 | list_add_tail(&target->list, &host->target_list); |
b3589fd4 | 1972 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
1973 | |
1974 | target->state = SRP_TARGET_LIVE; | |
1975 | ||
aef9ec39 | 1976 | scsi_scan_target(&target->scsi_host->shost_gendev, |
1962a4a1 | 1977 | 0, target->scsi_id, SCAN_WILD_CARD, 0); |
aef9ec39 RD |
1978 | |
1979 | return 0; | |
1980 | } | |
1981 | ||
ee959b00 | 1982 | static void srp_release_dev(struct device *dev) |
aef9ec39 RD |
1983 | { |
1984 | struct srp_host *host = | |
ee959b00 | 1985 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
1986 | |
1987 | complete(&host->released); | |
1988 | } | |
1989 | ||
1990 | static struct class srp_class = { | |
1991 | .name = "infiniband_srp", | |
ee959b00 | 1992 | .dev_release = srp_release_dev |
aef9ec39 RD |
1993 | }; |
1994 | ||
1995 | /* | |
1996 | * Target ports are added by writing | |
1997 | * | |
1998 | * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>, | |
1999 | * pkey=<P_Key>,service_id=<service ID> | |
2000 | * | |
2001 | * to the add_target sysfs attribute. | |
2002 | */ | |
2003 | enum { | |
2004 | SRP_OPT_ERR = 0, | |
2005 | SRP_OPT_ID_EXT = 1 << 0, | |
2006 | SRP_OPT_IOC_GUID = 1 << 1, | |
2007 | SRP_OPT_DGID = 1 << 2, | |
2008 | SRP_OPT_PKEY = 1 << 3, | |
2009 | SRP_OPT_SERVICE_ID = 1 << 4, | |
2010 | SRP_OPT_MAX_SECT = 1 << 5, | |
52fb2b50 | 2011 | SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, |
0c0450db | 2012 | SRP_OPT_IO_CLASS = 1 << 7, |
01cb9bcb | 2013 | SRP_OPT_INITIATOR_EXT = 1 << 8, |
49248644 | 2014 | SRP_OPT_CMD_SG_ENTRIES = 1 << 9, |
c07d424d DD |
2015 | SRP_OPT_ALLOW_EXT_SG = 1 << 10, |
2016 | SRP_OPT_SG_TABLESIZE = 1 << 11, | |
aef9ec39 RD |
2017 | SRP_OPT_ALL = (SRP_OPT_ID_EXT | |
2018 | SRP_OPT_IOC_GUID | | |
2019 | SRP_OPT_DGID | | |
2020 | SRP_OPT_PKEY | | |
2021 | SRP_OPT_SERVICE_ID), | |
2022 | }; | |
2023 | ||
a447c093 | 2024 | static const match_table_t srp_opt_tokens = { |
52fb2b50 VP |
2025 | { SRP_OPT_ID_EXT, "id_ext=%s" }, |
2026 | { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, | |
2027 | { SRP_OPT_DGID, "dgid=%s" }, | |
2028 | { SRP_OPT_PKEY, "pkey=%x" }, | |
2029 | { SRP_OPT_SERVICE_ID, "service_id=%s" }, | |
2030 | { SRP_OPT_MAX_SECT, "max_sect=%d" }, | |
2031 | { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, | |
0c0450db | 2032 | { SRP_OPT_IO_CLASS, "io_class=%x" }, |
01cb9bcb | 2033 | { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, |
49248644 | 2034 | { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" }, |
c07d424d DD |
2035 | { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" }, |
2036 | { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" }, | |
52fb2b50 | 2037 | { SRP_OPT_ERR, NULL } |
aef9ec39 RD |
2038 | }; |
2039 | ||
2040 | static int srp_parse_options(const char *buf, struct srp_target_port *target) | |
2041 | { | |
2042 | char *options, *sep_opt; | |
2043 | char *p; | |
2044 | char dgid[3]; | |
2045 | substring_t args[MAX_OPT_ARGS]; | |
2046 | int opt_mask = 0; | |
2047 | int token; | |
2048 | int ret = -EINVAL; | |
2049 | int i; | |
2050 | ||
2051 | options = kstrdup(buf, GFP_KERNEL); | |
2052 | if (!options) | |
2053 | return -ENOMEM; | |
2054 | ||
2055 | sep_opt = options; | |
2056 | while ((p = strsep(&sep_opt, ",")) != NULL) { | |
2057 | if (!*p) | |
2058 | continue; | |
2059 | ||
2060 | token = match_token(p, srp_opt_tokens, args); | |
2061 | opt_mask |= token; | |
2062 | ||
2063 | switch (token) { | |
2064 | case SRP_OPT_ID_EXT: | |
2065 | p = match_strdup(args); | |
a20f3a6d IR |
2066 | if (!p) { |
2067 | ret = -ENOMEM; | |
2068 | goto out; | |
2069 | } | |
aef9ec39 RD |
2070 | target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2071 | kfree(p); | |
2072 | break; | |
2073 | ||
2074 | case SRP_OPT_IOC_GUID: | |
2075 | p = match_strdup(args); | |
a20f3a6d IR |
2076 | if (!p) { |
2077 | ret = -ENOMEM; | |
2078 | goto out; | |
2079 | } | |
aef9ec39 RD |
2080 | target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2081 | kfree(p); | |
2082 | break; | |
2083 | ||
2084 | case SRP_OPT_DGID: | |
2085 | p = match_strdup(args); | |
a20f3a6d IR |
2086 | if (!p) { |
2087 | ret = -ENOMEM; | |
2088 | goto out; | |
2089 | } | |
aef9ec39 | 2090 | if (strlen(p) != 32) { |
e0bda7d8 | 2091 | pr_warn("bad dest GID parameter '%s'\n", p); |
ce1823f0 | 2092 | kfree(p); |
aef9ec39 RD |
2093 | goto out; |
2094 | } | |
2095 | ||
2096 | for (i = 0; i < 16; ++i) { | |
2097 | strlcpy(dgid, p + i * 2, 3); | |
2098 | target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); | |
2099 | } | |
bf17c1c7 | 2100 | kfree(p); |
3633b3d0 | 2101 | memcpy(target->orig_dgid, target->path.dgid.raw, 16); |
aef9ec39 RD |
2102 | break; |
2103 | ||
2104 | case SRP_OPT_PKEY: | |
2105 | if (match_hex(args, &token)) { | |
e0bda7d8 | 2106 | pr_warn("bad P_Key parameter '%s'\n", p); |
aef9ec39 RD |
2107 | goto out; |
2108 | } | |
2109 | target->path.pkey = cpu_to_be16(token); | |
2110 | break; | |
2111 | ||
2112 | case SRP_OPT_SERVICE_ID: | |
2113 | p = match_strdup(args); | |
a20f3a6d IR |
2114 | if (!p) { |
2115 | ret = -ENOMEM; | |
2116 | goto out; | |
2117 | } | |
aef9ec39 | 2118 | target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
247e020e | 2119 | target->path.service_id = target->service_id; |
aef9ec39 RD |
2120 | kfree(p); |
2121 | break; | |
2122 | ||
2123 | case SRP_OPT_MAX_SECT: | |
2124 | if (match_int(args, &token)) { | |
e0bda7d8 | 2125 | pr_warn("bad max sect parameter '%s'\n", p); |
aef9ec39 RD |
2126 | goto out; |
2127 | } | |
2128 | target->scsi_host->max_sectors = token; | |
2129 | break; | |
2130 | ||
52fb2b50 VP |
2131 | case SRP_OPT_MAX_CMD_PER_LUN: |
2132 | if (match_int(args, &token)) { | |
e0bda7d8 BVA |
2133 | pr_warn("bad max cmd_per_lun parameter '%s'\n", |
2134 | p); | |
52fb2b50 VP |
2135 | goto out; |
2136 | } | |
dd5e6e38 | 2137 | target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE); |
52fb2b50 VP |
2138 | break; |
2139 | ||
0c0450db R |
2140 | case SRP_OPT_IO_CLASS: |
2141 | if (match_hex(args, &token)) { | |
e0bda7d8 | 2142 | pr_warn("bad IO class parameter '%s'\n", p); |
0c0450db R |
2143 | goto out; |
2144 | } | |
2145 | if (token != SRP_REV10_IB_IO_CLASS && | |
2146 | token != SRP_REV16A_IB_IO_CLASS) { | |
e0bda7d8 BVA |
2147 | pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n", |
2148 | token, SRP_REV10_IB_IO_CLASS, | |
2149 | SRP_REV16A_IB_IO_CLASS); | |
0c0450db R |
2150 | goto out; |
2151 | } | |
2152 | target->io_class = token; | |
2153 | break; | |
2154 | ||
01cb9bcb IR |
2155 | case SRP_OPT_INITIATOR_EXT: |
2156 | p = match_strdup(args); | |
a20f3a6d IR |
2157 | if (!p) { |
2158 | ret = -ENOMEM; | |
2159 | goto out; | |
2160 | } | |
01cb9bcb IR |
2161 | target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); |
2162 | kfree(p); | |
2163 | break; | |
2164 | ||
49248644 DD |
2165 | case SRP_OPT_CMD_SG_ENTRIES: |
2166 | if (match_int(args, &token) || token < 1 || token > 255) { | |
e0bda7d8 BVA |
2167 | pr_warn("bad max cmd_sg_entries parameter '%s'\n", |
2168 | p); | |
49248644 DD |
2169 | goto out; |
2170 | } | |
2171 | target->cmd_sg_cnt = token; | |
2172 | break; | |
2173 | ||
c07d424d DD |
2174 | case SRP_OPT_ALLOW_EXT_SG: |
2175 | if (match_int(args, &token)) { | |
e0bda7d8 | 2176 | pr_warn("bad allow_ext_sg parameter '%s'\n", p); |
c07d424d DD |
2177 | goto out; |
2178 | } | |
2179 | target->allow_ext_sg = !!token; | |
2180 | break; | |
2181 | ||
2182 | case SRP_OPT_SG_TABLESIZE: | |
2183 | if (match_int(args, &token) || token < 1 || | |
2184 | token > SCSI_MAX_SG_CHAIN_SEGMENTS) { | |
e0bda7d8 BVA |
2185 | pr_warn("bad max sg_tablesize parameter '%s'\n", |
2186 | p); | |
c07d424d DD |
2187 | goto out; |
2188 | } | |
2189 | target->sg_tablesize = token; | |
2190 | break; | |
2191 | ||
aef9ec39 | 2192 | default: |
e0bda7d8 BVA |
2193 | pr_warn("unknown parameter or missing value '%s' in target creation request\n", |
2194 | p); | |
aef9ec39 RD |
2195 | goto out; |
2196 | } | |
2197 | } | |
2198 | ||
2199 | if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) | |
2200 | ret = 0; | |
2201 | else | |
2202 | for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) | |
2203 | if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && | |
2204 | !(srp_opt_tokens[i].token & opt_mask)) | |
e0bda7d8 BVA |
2205 | pr_warn("target creation request is missing parameter '%s'\n", |
2206 | srp_opt_tokens[i].pattern); | |
aef9ec39 RD |
2207 | |
2208 | out: | |
2209 | kfree(options); | |
2210 | return ret; | |
2211 | } | |
2212 | ||
ee959b00 TJ |
2213 | static ssize_t srp_create_target(struct device *dev, |
2214 | struct device_attribute *attr, | |
aef9ec39 RD |
2215 | const char *buf, size_t count) |
2216 | { | |
2217 | struct srp_host *host = | |
ee959b00 | 2218 | container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2219 | struct Scsi_Host *target_host; |
2220 | struct srp_target_port *target; | |
c07d424d DD |
2221 | struct ib_device *ibdev = host->srp_dev->dev; |
2222 | dma_addr_t dma_addr; | |
8f26c9ff | 2223 | int i, ret; |
aef9ec39 RD |
2224 | |
2225 | target_host = scsi_host_alloc(&srp_template, | |
2226 | sizeof (struct srp_target_port)); | |
2227 | if (!target_host) | |
2228 | return -ENOMEM; | |
2229 | ||
49248644 | 2230 | target_host->transportt = ib_srp_transport_template; |
fd1b6c4a BVA |
2231 | target_host->max_channel = 0; |
2232 | target_host->max_id = 1; | |
3c8edf0e AR |
2233 | target_host->max_lun = SRP_MAX_LUN; |
2234 | target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; | |
5f068992 | 2235 | |
aef9ec39 | 2236 | target = host_to_target(target_host); |
aef9ec39 | 2237 | |
49248644 DD |
2238 | target->io_class = SRP_REV16A_IB_IO_CLASS; |
2239 | target->scsi_host = target_host; | |
2240 | target->srp_host = host; | |
2241 | target->lkey = host->srp_dev->mr->lkey; | |
2242 | target->rkey = host->srp_dev->mr->rkey; | |
2243 | target->cmd_sg_cnt = cmd_sg_entries; | |
c07d424d DD |
2244 | target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries; |
2245 | target->allow_ext_sg = allow_ext_sg; | |
aef9ec39 | 2246 | |
aef9ec39 RD |
2247 | ret = srp_parse_options(buf, target); |
2248 | if (ret) | |
2249 | goto err; | |
2250 | ||
c07d424d DD |
2251 | if (!host->srp_dev->fmr_pool && !target->allow_ext_sg && |
2252 | target->cmd_sg_cnt < target->sg_tablesize) { | |
e0bda7d8 | 2253 | pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n"); |
c07d424d DD |
2254 | target->sg_tablesize = target->cmd_sg_cnt; |
2255 | } | |
2256 | ||
2257 | target_host->sg_tablesize = target->sg_tablesize; | |
2258 | target->indirect_size = target->sg_tablesize * | |
2259 | sizeof (struct srp_direct_buf); | |
49248644 DD |
2260 | target->max_iu_len = sizeof (struct srp_cmd) + |
2261 | sizeof (struct srp_indirect_buf) + | |
2262 | target->cmd_sg_cnt * sizeof (struct srp_direct_buf); | |
2263 | ||
ef6c49d8 | 2264 | INIT_WORK(&target->remove_work, srp_remove_work); |
8f26c9ff DD |
2265 | spin_lock_init(&target->lock); |
2266 | INIT_LIST_HEAD(&target->free_tx); | |
2267 | INIT_LIST_HEAD(&target->free_reqs); | |
2268 | for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { | |
2269 | struct srp_request *req = &target->req_ring[i]; | |
2270 | ||
2271 | req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *), | |
2272 | GFP_KERNEL); | |
2273 | req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *), | |
2274 | GFP_KERNEL); | |
c07d424d DD |
2275 | req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL); |
2276 | if (!req->fmr_list || !req->map_page || !req->indirect_desc) | |
8f26c9ff DD |
2277 | goto err_free_mem; |
2278 | ||
c07d424d DD |
2279 | dma_addr = ib_dma_map_single(ibdev, req->indirect_desc, |
2280 | target->indirect_size, | |
2281 | DMA_TO_DEVICE); | |
2282 | if (ib_dma_mapping_error(ibdev, dma_addr)) | |
2283 | goto err_free_mem; | |
2284 | ||
2285 | req->indirect_dma_addr = dma_addr; | |
8f26c9ff DD |
2286 | req->index = i; |
2287 | list_add_tail(&req->list, &target->free_reqs); | |
2288 | } | |
2289 | ||
c07d424d | 2290 | ib_query_gid(ibdev, host->port, 0, &target->path.sgid); |
aef9ec39 | 2291 | |
7aa54bd7 DD |
2292 | shost_printk(KERN_DEBUG, target->scsi_host, PFX |
2293 | "new target: id_ext %016llx ioc_guid %016llx pkey %04x " | |
5b095d98 | 2294 | "service_id %016llx dgid %pI6\n", |
aef9ec39 RD |
2295 | (unsigned long long) be64_to_cpu(target->id_ext), |
2296 | (unsigned long long) be64_to_cpu(target->ioc_guid), | |
2297 | be16_to_cpu(target->path.pkey), | |
2298 | (unsigned long long) be64_to_cpu(target->service_id), | |
8867cd7c | 2299 | target->path.dgid.raw); |
aef9ec39 RD |
2300 | |
2301 | ret = srp_create_target_ib(target); | |
2302 | if (ret) | |
8f26c9ff | 2303 | goto err_free_mem; |
aef9ec39 | 2304 | |
9fe4bcf4 DD |
2305 | ret = srp_new_cm_id(target); |
2306 | if (ret) | |
8f26c9ff | 2307 | goto err_free_ib; |
aef9ec39 RD |
2308 | |
2309 | ret = srp_connect_target(target); | |
2310 | if (ret) { | |
7aa54bd7 DD |
2311 | shost_printk(KERN_ERR, target->scsi_host, |
2312 | PFX "Connection failed\n"); | |
aef9ec39 RD |
2313 | goto err_cm_id; |
2314 | } | |
2315 | ||
2316 | ret = srp_add_target(host, target); | |
2317 | if (ret) | |
2318 | goto err_disconnect; | |
2319 | ||
2320 | return count; | |
2321 | ||
2322 | err_disconnect: | |
2323 | srp_disconnect_target(target); | |
2324 | ||
2325 | err_cm_id: | |
2326 | ib_destroy_cm_id(target->cm_id); | |
2327 | ||
8f26c9ff | 2328 | err_free_ib: |
aef9ec39 RD |
2329 | srp_free_target_ib(target); |
2330 | ||
8f26c9ff DD |
2331 | err_free_mem: |
2332 | srp_free_req_data(target); | |
2333 | ||
aef9ec39 RD |
2334 | err: |
2335 | scsi_host_put(target_host); | |
2336 | ||
2337 | return ret; | |
2338 | } | |
2339 | ||
ee959b00 | 2340 | static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); |
aef9ec39 | 2341 | |
ee959b00 TJ |
2342 | static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, |
2343 | char *buf) | |
aef9ec39 | 2344 | { |
ee959b00 | 2345 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 | 2346 | |
05321937 | 2347 | return sprintf(buf, "%s\n", host->srp_dev->dev->name); |
aef9ec39 RD |
2348 | } |
2349 | ||
ee959b00 | 2350 | static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
aef9ec39 | 2351 | |
ee959b00 TJ |
2352 | static ssize_t show_port(struct device *dev, struct device_attribute *attr, |
2353 | char *buf) | |
aef9ec39 | 2354 | { |
ee959b00 | 2355 | struct srp_host *host = container_of(dev, struct srp_host, dev); |
aef9ec39 RD |
2356 | |
2357 | return sprintf(buf, "%d\n", host->port); | |
2358 | } | |
2359 | ||
ee959b00 | 2360 | static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); |
aef9ec39 | 2361 | |
f5358a17 | 2362 | static struct srp_host *srp_add_port(struct srp_device *device, u8 port) |
aef9ec39 RD |
2363 | { |
2364 | struct srp_host *host; | |
2365 | ||
2366 | host = kzalloc(sizeof *host, GFP_KERNEL); | |
2367 | if (!host) | |
2368 | return NULL; | |
2369 | ||
2370 | INIT_LIST_HEAD(&host->target_list); | |
b3589fd4 | 2371 | spin_lock_init(&host->target_lock); |
aef9ec39 | 2372 | init_completion(&host->released); |
05321937 | 2373 | host->srp_dev = device; |
aef9ec39 RD |
2374 | host->port = port; |
2375 | ||
ee959b00 TJ |
2376 | host->dev.class = &srp_class; |
2377 | host->dev.parent = device->dev->dma_device; | |
d927e38c | 2378 | dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port); |
aef9ec39 | 2379 | |
ee959b00 | 2380 | if (device_register(&host->dev)) |
f5358a17 | 2381 | goto free_host; |
ee959b00 | 2382 | if (device_create_file(&host->dev, &dev_attr_add_target)) |
aef9ec39 | 2383 | goto err_class; |
ee959b00 | 2384 | if (device_create_file(&host->dev, &dev_attr_ibdev)) |
aef9ec39 | 2385 | goto err_class; |
ee959b00 | 2386 | if (device_create_file(&host->dev, &dev_attr_port)) |
aef9ec39 RD |
2387 | goto err_class; |
2388 | ||
2389 | return host; | |
2390 | ||
2391 | err_class: | |
ee959b00 | 2392 | device_unregister(&host->dev); |
aef9ec39 | 2393 | |
f5358a17 | 2394 | free_host: |
aef9ec39 RD |
2395 | kfree(host); |
2396 | ||
2397 | return NULL; | |
2398 | } | |
2399 | ||
2400 | static void srp_add_one(struct ib_device *device) | |
2401 | { | |
f5358a17 RD |
2402 | struct srp_device *srp_dev; |
2403 | struct ib_device_attr *dev_attr; | |
2404 | struct ib_fmr_pool_param fmr_param; | |
aef9ec39 | 2405 | struct srp_host *host; |
be8b9814 | 2406 | int max_pages_per_fmr, fmr_page_shift, s, e, p; |
aef9ec39 | 2407 | |
f5358a17 RD |
2408 | dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); |
2409 | if (!dev_attr) | |
cf311cd4 | 2410 | return; |
aef9ec39 | 2411 | |
f5358a17 | 2412 | if (ib_query_device(device, dev_attr)) { |
e0bda7d8 | 2413 | pr_warn("Query device failed for %s\n", device->name); |
f5358a17 RD |
2414 | goto free_attr; |
2415 | } | |
2416 | ||
2417 | srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); | |
2418 | if (!srp_dev) | |
2419 | goto free_attr; | |
2420 | ||
2421 | /* | |
2422 | * Use the smallest page size supported by the HCA, down to a | |
8f26c9ff DD |
2423 | * minimum of 4096 bytes. We're unlikely to build large sglists |
2424 | * out of smaller entries. | |
f5358a17 | 2425 | */ |
8f26c9ff DD |
2426 | fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1); |
2427 | srp_dev->fmr_page_size = 1 << fmr_page_shift; | |
2428 | srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1); | |
2429 | srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE; | |
f5358a17 RD |
2430 | |
2431 | INIT_LIST_HEAD(&srp_dev->dev_list); | |
2432 | ||
2433 | srp_dev->dev = device; | |
2434 | srp_dev->pd = ib_alloc_pd(device); | |
2435 | if (IS_ERR(srp_dev->pd)) | |
2436 | goto free_dev; | |
2437 | ||
2438 | srp_dev->mr = ib_get_dma_mr(srp_dev->pd, | |
2439 | IB_ACCESS_LOCAL_WRITE | | |
2440 | IB_ACCESS_REMOTE_READ | | |
2441 | IB_ACCESS_REMOTE_WRITE); | |
2442 | if (IS_ERR(srp_dev->mr)) | |
2443 | goto err_pd; | |
2444 | ||
be8b9814 DD |
2445 | for (max_pages_per_fmr = SRP_FMR_SIZE; |
2446 | max_pages_per_fmr >= SRP_FMR_MIN_SIZE; | |
2447 | max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) { | |
2448 | memset(&fmr_param, 0, sizeof fmr_param); | |
2449 | fmr_param.pool_size = SRP_FMR_POOL_SIZE; | |
2450 | fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; | |
2451 | fmr_param.cache = 1; | |
2452 | fmr_param.max_pages_per_fmr = max_pages_per_fmr; | |
2453 | fmr_param.page_shift = fmr_page_shift; | |
2454 | fmr_param.access = (IB_ACCESS_LOCAL_WRITE | | |
2455 | IB_ACCESS_REMOTE_WRITE | | |
2456 | IB_ACCESS_REMOTE_READ); | |
2457 | ||
2458 | srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); | |
2459 | if (!IS_ERR(srp_dev->fmr_pool)) | |
2460 | break; | |
2461 | } | |
2462 | ||
f5358a17 RD |
2463 | if (IS_ERR(srp_dev->fmr_pool)) |
2464 | srp_dev->fmr_pool = NULL; | |
aef9ec39 | 2465 | |
07ebafba | 2466 | if (device->node_type == RDMA_NODE_IB_SWITCH) { |
aef9ec39 RD |
2467 | s = 0; |
2468 | e = 0; | |
2469 | } else { | |
2470 | s = 1; | |
2471 | e = device->phys_port_cnt; | |
2472 | } | |
2473 | ||
2474 | for (p = s; p <= e; ++p) { | |
f5358a17 | 2475 | host = srp_add_port(srp_dev, p); |
aef9ec39 | 2476 | if (host) |
f5358a17 | 2477 | list_add_tail(&host->list, &srp_dev->dev_list); |
aef9ec39 RD |
2478 | } |
2479 | ||
f5358a17 RD |
2480 | ib_set_client_data(device, &srp_client, srp_dev); |
2481 | ||
2482 | goto free_attr; | |
2483 | ||
2484 | err_pd: | |
2485 | ib_dealloc_pd(srp_dev->pd); | |
2486 | ||
2487 | free_dev: | |
2488 | kfree(srp_dev); | |
2489 | ||
2490 | free_attr: | |
2491 | kfree(dev_attr); | |
aef9ec39 RD |
2492 | } |
2493 | ||
2494 | static void srp_remove_one(struct ib_device *device) | |
2495 | { | |
f5358a17 | 2496 | struct srp_device *srp_dev; |
aef9ec39 | 2497 | struct srp_host *host, *tmp_host; |
ef6c49d8 | 2498 | struct srp_target_port *target; |
aef9ec39 | 2499 | |
f5358a17 | 2500 | srp_dev = ib_get_client_data(device, &srp_client); |
aef9ec39 | 2501 | |
f5358a17 | 2502 | list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { |
ee959b00 | 2503 | device_unregister(&host->dev); |
aef9ec39 RD |
2504 | /* |
2505 | * Wait for the sysfs entry to go away, so that no new | |
2506 | * target ports can be created. | |
2507 | */ | |
2508 | wait_for_completion(&host->released); | |
2509 | ||
2510 | /* | |
ef6c49d8 | 2511 | * Remove all target ports. |
aef9ec39 | 2512 | */ |
b3589fd4 | 2513 | spin_lock(&host->target_lock); |
ef6c49d8 BVA |
2514 | list_for_each_entry(target, &host->target_list, list) |
2515 | srp_queue_remove_work(target); | |
b3589fd4 | 2516 | spin_unlock(&host->target_lock); |
aef9ec39 RD |
2517 | |
2518 | /* | |
ef6c49d8 | 2519 | * Wait for target port removal tasks. |
aef9ec39 | 2520 | */ |
ef6c49d8 | 2521 | flush_workqueue(system_long_wq); |
aef9ec39 | 2522 | |
aef9ec39 RD |
2523 | kfree(host); |
2524 | } | |
2525 | ||
f5358a17 RD |
2526 | if (srp_dev->fmr_pool) |
2527 | ib_destroy_fmr_pool(srp_dev->fmr_pool); | |
2528 | ib_dereg_mr(srp_dev->mr); | |
2529 | ib_dealloc_pd(srp_dev->pd); | |
2530 | ||
2531 | kfree(srp_dev); | |
aef9ec39 RD |
2532 | } |
2533 | ||
3236822b | 2534 | static struct srp_function_template ib_srp_transport_functions = { |
dc1bdbd9 | 2535 | .rport_delete = srp_rport_delete, |
3236822b FT |
2536 | }; |
2537 | ||
aef9ec39 RD |
2538 | static int __init srp_init_module(void) |
2539 | { | |
2540 | int ret; | |
2541 | ||
dcb4cb85 | 2542 | BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *)); |
dd5e6e38 | 2543 | |
49248644 | 2544 | if (srp_sg_tablesize) { |
e0bda7d8 | 2545 | pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n"); |
49248644 DD |
2546 | if (!cmd_sg_entries) |
2547 | cmd_sg_entries = srp_sg_tablesize; | |
2548 | } | |
2549 | ||
2550 | if (!cmd_sg_entries) | |
2551 | cmd_sg_entries = SRP_DEF_SG_TABLESIZE; | |
2552 | ||
2553 | if (cmd_sg_entries > 255) { | |
e0bda7d8 | 2554 | pr_warn("Clamping cmd_sg_entries to 255\n"); |
49248644 | 2555 | cmd_sg_entries = 255; |
1e89a194 DD |
2556 | } |
2557 | ||
c07d424d DD |
2558 | if (!indirect_sg_entries) |
2559 | indirect_sg_entries = cmd_sg_entries; | |
2560 | else if (indirect_sg_entries < cmd_sg_entries) { | |
e0bda7d8 BVA |
2561 | pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n", |
2562 | cmd_sg_entries); | |
c07d424d DD |
2563 | indirect_sg_entries = cmd_sg_entries; |
2564 | } | |
2565 | ||
3236822b FT |
2566 | ib_srp_transport_template = |
2567 | srp_attach_transport(&ib_srp_transport_functions); | |
2568 | if (!ib_srp_transport_template) | |
2569 | return -ENOMEM; | |
2570 | ||
aef9ec39 RD |
2571 | ret = class_register(&srp_class); |
2572 | if (ret) { | |
e0bda7d8 | 2573 | pr_err("couldn't register class infiniband_srp\n"); |
3236822b | 2574 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
2575 | return ret; |
2576 | } | |
2577 | ||
c1a0b23b MT |
2578 | ib_sa_register_client(&srp_sa_client); |
2579 | ||
aef9ec39 RD |
2580 | ret = ib_register_client(&srp_client); |
2581 | if (ret) { | |
e0bda7d8 | 2582 | pr_err("couldn't register IB client\n"); |
3236822b | 2583 | srp_release_transport(ib_srp_transport_template); |
c1a0b23b | 2584 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 RD |
2585 | class_unregister(&srp_class); |
2586 | return ret; | |
2587 | } | |
2588 | ||
2589 | return 0; | |
2590 | } | |
2591 | ||
2592 | static void __exit srp_cleanup_module(void) | |
2593 | { | |
2594 | ib_unregister_client(&srp_client); | |
c1a0b23b | 2595 | ib_sa_unregister_client(&srp_sa_client); |
aef9ec39 | 2596 | class_unregister(&srp_class); |
3236822b | 2597 | srp_release_transport(ib_srp_transport_template); |
aef9ec39 RD |
2598 | } |
2599 | ||
2600 | module_init(srp_init_module); | |
2601 | module_exit(srp_cleanup_module); |