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75216638 SH |
1 | /* |
2 | * Copyright (c) 2005-2006 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
33 | #include <linux/completion.h> | |
88314e4d | 34 | #include <linux/file.h> |
75216638 SH |
35 | #include <linux/mutex.h> |
36 | #include <linux/poll.h> | |
d43c36dc | 37 | #include <linux/sched.h> |
75216638 SH |
38 | #include <linux/idr.h> |
39 | #include <linux/in.h> | |
40 | #include <linux/in6.h> | |
41 | #include <linux/miscdevice.h> | |
42 | ||
43 | #include <rdma/rdma_user_cm.h> | |
44 | #include <rdma/ib_marshall.h> | |
45 | #include <rdma/rdma_cm.h> | |
46 | ||
47 | MODULE_AUTHOR("Sean Hefty"); | |
48 | MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access"); | |
49 | MODULE_LICENSE("Dual BSD/GPL"); | |
50 | ||
51 | enum { | |
52 | UCMA_MAX_BACKLOG = 128 | |
53 | }; | |
54 | ||
55 | struct ucma_file { | |
56 | struct mutex mut; | |
57 | struct file *filp; | |
58 | struct list_head ctx_list; | |
59 | struct list_head event_list; | |
60 | wait_queue_head_t poll_wait; | |
61 | }; | |
62 | ||
63 | struct ucma_context { | |
64 | int id; | |
65 | struct completion comp; | |
66 | atomic_t ref; | |
67 | int events_reported; | |
68 | int backlog; | |
69 | ||
70 | struct ucma_file *file; | |
71 | struct rdma_cm_id *cm_id; | |
72 | u64 uid; | |
73 | ||
74 | struct list_head list; | |
c8f6a362 SH |
75 | struct list_head mc_list; |
76 | }; | |
77 | ||
78 | struct ucma_multicast { | |
79 | struct ucma_context *ctx; | |
80 | int id; | |
81 | int events_reported; | |
82 | ||
83 | u64 uid; | |
84 | struct list_head list; | |
3f446754 | 85 | struct sockaddr_storage addr; |
75216638 SH |
86 | }; |
87 | ||
88 | struct ucma_event { | |
89 | struct ucma_context *ctx; | |
c8f6a362 | 90 | struct ucma_multicast *mc; |
75216638 SH |
91 | struct list_head list; |
92 | struct rdma_cm_id *cm_id; | |
93 | struct rdma_ucm_event_resp resp; | |
94 | }; | |
95 | ||
96 | static DEFINE_MUTEX(mut); | |
97 | static DEFINE_IDR(ctx_idr); | |
c8f6a362 | 98 | static DEFINE_IDR(multicast_idr); |
75216638 SH |
99 | |
100 | static inline struct ucma_context *_ucma_find_context(int id, | |
101 | struct ucma_file *file) | |
102 | { | |
103 | struct ucma_context *ctx; | |
104 | ||
105 | ctx = idr_find(&ctx_idr, id); | |
106 | if (!ctx) | |
107 | ctx = ERR_PTR(-ENOENT); | |
108 | else if (ctx->file != file) | |
109 | ctx = ERR_PTR(-EINVAL); | |
110 | return ctx; | |
111 | } | |
112 | ||
113 | static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id) | |
114 | { | |
115 | struct ucma_context *ctx; | |
116 | ||
117 | mutex_lock(&mut); | |
118 | ctx = _ucma_find_context(id, file); | |
119 | if (!IS_ERR(ctx)) | |
120 | atomic_inc(&ctx->ref); | |
121 | mutex_unlock(&mut); | |
122 | return ctx; | |
123 | } | |
124 | ||
125 | static void ucma_put_ctx(struct ucma_context *ctx) | |
126 | { | |
127 | if (atomic_dec_and_test(&ctx->ref)) | |
128 | complete(&ctx->comp); | |
129 | } | |
130 | ||
131 | static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file) | |
132 | { | |
133 | struct ucma_context *ctx; | |
134 | int ret; | |
135 | ||
136 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
137 | if (!ctx) | |
138 | return NULL; | |
139 | ||
140 | atomic_set(&ctx->ref, 1); | |
141 | init_completion(&ctx->comp); | |
c8f6a362 | 142 | INIT_LIST_HEAD(&ctx->mc_list); |
75216638 SH |
143 | ctx->file = file; |
144 | ||
145 | do { | |
146 | ret = idr_pre_get(&ctx_idr, GFP_KERNEL); | |
147 | if (!ret) | |
148 | goto error; | |
149 | ||
150 | mutex_lock(&mut); | |
151 | ret = idr_get_new(&ctx_idr, ctx, &ctx->id); | |
152 | mutex_unlock(&mut); | |
153 | } while (ret == -EAGAIN); | |
154 | ||
155 | if (ret) | |
156 | goto error; | |
157 | ||
158 | list_add_tail(&ctx->list, &file->ctx_list); | |
159 | return ctx; | |
160 | ||
161 | error: | |
162 | kfree(ctx); | |
163 | return NULL; | |
164 | } | |
165 | ||
c8f6a362 SH |
166 | static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx) |
167 | { | |
168 | struct ucma_multicast *mc; | |
169 | int ret; | |
170 | ||
171 | mc = kzalloc(sizeof(*mc), GFP_KERNEL); | |
172 | if (!mc) | |
173 | return NULL; | |
174 | ||
175 | do { | |
176 | ret = idr_pre_get(&multicast_idr, GFP_KERNEL); | |
177 | if (!ret) | |
178 | goto error; | |
179 | ||
180 | mutex_lock(&mut); | |
181 | ret = idr_get_new(&multicast_idr, mc, &mc->id); | |
182 | mutex_unlock(&mut); | |
183 | } while (ret == -EAGAIN); | |
184 | ||
185 | if (ret) | |
186 | goto error; | |
187 | ||
188 | mc->ctx = ctx; | |
189 | list_add_tail(&mc->list, &ctx->mc_list); | |
190 | return mc; | |
191 | ||
192 | error: | |
193 | kfree(mc); | |
194 | return NULL; | |
195 | } | |
196 | ||
75216638 SH |
197 | static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst, |
198 | struct rdma_conn_param *src) | |
199 | { | |
200 | if (src->private_data_len) | |
201 | memcpy(dst->private_data, src->private_data, | |
202 | src->private_data_len); | |
203 | dst->private_data_len = src->private_data_len; | |
204 | dst->responder_resources =src->responder_resources; | |
205 | dst->initiator_depth = src->initiator_depth; | |
206 | dst->flow_control = src->flow_control; | |
207 | dst->retry_count = src->retry_count; | |
208 | dst->rnr_retry_count = src->rnr_retry_count; | |
209 | dst->srq = src->srq; | |
210 | dst->qp_num = src->qp_num; | |
211 | } | |
212 | ||
213 | static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst, | |
214 | struct rdma_ud_param *src) | |
215 | { | |
216 | if (src->private_data_len) | |
217 | memcpy(dst->private_data, src->private_data, | |
218 | src->private_data_len); | |
219 | dst->private_data_len = src->private_data_len; | |
220 | ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr); | |
221 | dst->qp_num = src->qp_num; | |
222 | dst->qkey = src->qkey; | |
223 | } | |
224 | ||
225 | static void ucma_set_event_context(struct ucma_context *ctx, | |
226 | struct rdma_cm_event *event, | |
227 | struct ucma_event *uevent) | |
228 | { | |
229 | uevent->ctx = ctx; | |
c8f6a362 SH |
230 | switch (event->event) { |
231 | case RDMA_CM_EVENT_MULTICAST_JOIN: | |
232 | case RDMA_CM_EVENT_MULTICAST_ERROR: | |
233 | uevent->mc = (struct ucma_multicast *) | |
234 | event->param.ud.private_data; | |
235 | uevent->resp.uid = uevent->mc->uid; | |
236 | uevent->resp.id = uevent->mc->id; | |
237 | break; | |
238 | default: | |
239 | uevent->resp.uid = ctx->uid; | |
240 | uevent->resp.id = ctx->id; | |
241 | break; | |
242 | } | |
75216638 SH |
243 | } |
244 | ||
245 | static int ucma_event_handler(struct rdma_cm_id *cm_id, | |
246 | struct rdma_cm_event *event) | |
247 | { | |
248 | struct ucma_event *uevent; | |
249 | struct ucma_context *ctx = cm_id->context; | |
250 | int ret = 0; | |
251 | ||
252 | uevent = kzalloc(sizeof(*uevent), GFP_KERNEL); | |
253 | if (!uevent) | |
254 | return event->event == RDMA_CM_EVENT_CONNECT_REQUEST; | |
255 | ||
256 | uevent->cm_id = cm_id; | |
257 | ucma_set_event_context(ctx, event, uevent); | |
258 | uevent->resp.event = event->event; | |
259 | uevent->resp.status = event->status; | |
c8f6a362 | 260 | if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB) |
75216638 SH |
261 | ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud); |
262 | else | |
263 | ucma_copy_conn_event(&uevent->resp.param.conn, | |
264 | &event->param.conn); | |
265 | ||
266 | mutex_lock(&ctx->file->mut); | |
267 | if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) { | |
268 | if (!ctx->backlog) { | |
3492856e | 269 | ret = -ENOMEM; |
30a5ec98 | 270 | kfree(uevent); |
75216638 SH |
271 | goto out; |
272 | } | |
273 | ctx->backlog--; | |
0cefcf0b SH |
274 | } else if (!ctx->uid) { |
275 | /* | |
276 | * We ignore events for new connections until userspace has set | |
277 | * their context. This can only happen if an error occurs on a | |
278 | * new connection before the user accepts it. This is okay, | |
279 | * since the accept will just fail later. | |
280 | */ | |
281 | kfree(uevent); | |
282 | goto out; | |
75216638 | 283 | } |
0cefcf0b | 284 | |
75216638 SH |
285 | list_add_tail(&uevent->list, &ctx->file->event_list); |
286 | wake_up_interruptible(&ctx->file->poll_wait); | |
287 | out: | |
288 | mutex_unlock(&ctx->file->mut); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf, | |
293 | int in_len, int out_len) | |
294 | { | |
295 | struct ucma_context *ctx; | |
296 | struct rdma_ucm_get_event cmd; | |
297 | struct ucma_event *uevent; | |
298 | int ret = 0; | |
299 | DEFINE_WAIT(wait); | |
300 | ||
301 | if (out_len < sizeof uevent->resp) | |
302 | return -ENOSPC; | |
303 | ||
304 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
305 | return -EFAULT; | |
306 | ||
307 | mutex_lock(&file->mut); | |
308 | while (list_empty(&file->event_list)) { | |
d92f7644 | 309 | mutex_unlock(&file->mut); |
75216638 | 310 | |
d92f7644 SH |
311 | if (file->filp->f_flags & O_NONBLOCK) |
312 | return -EAGAIN; | |
313 | ||
314 | if (wait_event_interruptible(file->poll_wait, | |
315 | !list_empty(&file->event_list))) | |
316 | return -ERESTARTSYS; | |
75216638 | 317 | |
75216638 | 318 | mutex_lock(&file->mut); |
75216638 SH |
319 | } |
320 | ||
75216638 SH |
321 | uevent = list_entry(file->event_list.next, struct ucma_event, list); |
322 | ||
323 | if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) { | |
324 | ctx = ucma_alloc_ctx(file); | |
325 | if (!ctx) { | |
326 | ret = -ENOMEM; | |
327 | goto done; | |
328 | } | |
329 | uevent->ctx->backlog++; | |
330 | ctx->cm_id = uevent->cm_id; | |
331 | ctx->cm_id->context = ctx; | |
332 | uevent->resp.id = ctx->id; | |
333 | } | |
334 | ||
335 | if (copy_to_user((void __user *)(unsigned long)cmd.response, | |
336 | &uevent->resp, sizeof uevent->resp)) { | |
337 | ret = -EFAULT; | |
338 | goto done; | |
339 | } | |
340 | ||
341 | list_del(&uevent->list); | |
342 | uevent->ctx->events_reported++; | |
c8f6a362 SH |
343 | if (uevent->mc) |
344 | uevent->mc->events_reported++; | |
75216638 SH |
345 | kfree(uevent); |
346 | done: | |
347 | mutex_unlock(&file->mut); | |
348 | return ret; | |
349 | } | |
350 | ||
351 | static ssize_t ucma_create_id(struct ucma_file *file, | |
352 | const char __user *inbuf, | |
353 | int in_len, int out_len) | |
354 | { | |
355 | struct rdma_ucm_create_id cmd; | |
356 | struct rdma_ucm_create_id_resp resp; | |
357 | struct ucma_context *ctx; | |
358 | int ret; | |
359 | ||
360 | if (out_len < sizeof(resp)) | |
361 | return -ENOSPC; | |
362 | ||
363 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
364 | return -EFAULT; | |
365 | ||
366 | mutex_lock(&file->mut); | |
367 | ctx = ucma_alloc_ctx(file); | |
368 | mutex_unlock(&file->mut); | |
369 | if (!ctx) | |
370 | return -ENOMEM; | |
371 | ||
372 | ctx->uid = cmd.uid; | |
373 | ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps); | |
374 | if (IS_ERR(ctx->cm_id)) { | |
375 | ret = PTR_ERR(ctx->cm_id); | |
376 | goto err1; | |
377 | } | |
378 | ||
379 | resp.id = ctx->id; | |
380 | if (copy_to_user((void __user *)(unsigned long)cmd.response, | |
381 | &resp, sizeof(resp))) { | |
382 | ret = -EFAULT; | |
383 | goto err2; | |
384 | } | |
385 | return 0; | |
386 | ||
387 | err2: | |
388 | rdma_destroy_id(ctx->cm_id); | |
389 | err1: | |
390 | mutex_lock(&mut); | |
391 | idr_remove(&ctx_idr, ctx->id); | |
392 | mutex_unlock(&mut); | |
393 | kfree(ctx); | |
394 | return ret; | |
395 | } | |
396 | ||
c8f6a362 SH |
397 | static void ucma_cleanup_multicast(struct ucma_context *ctx) |
398 | { | |
399 | struct ucma_multicast *mc, *tmp; | |
400 | ||
401 | mutex_lock(&mut); | |
402 | list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) { | |
403 | list_del(&mc->list); | |
404 | idr_remove(&multicast_idr, mc->id); | |
405 | kfree(mc); | |
406 | } | |
407 | mutex_unlock(&mut); | |
408 | } | |
409 | ||
75216638 SH |
410 | static void ucma_cleanup_events(struct ucma_context *ctx) |
411 | { | |
412 | struct ucma_event *uevent, *tmp; | |
413 | ||
414 | list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) { | |
415 | if (uevent->ctx != ctx) | |
416 | continue; | |
417 | ||
418 | list_del(&uevent->list); | |
419 | ||
420 | /* clear incoming connections. */ | |
421 | if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) | |
422 | rdma_destroy_id(uevent->cm_id); | |
423 | ||
424 | kfree(uevent); | |
425 | } | |
426 | } | |
427 | ||
c8f6a362 SH |
428 | static void ucma_cleanup_mc_events(struct ucma_multicast *mc) |
429 | { | |
430 | struct ucma_event *uevent, *tmp; | |
431 | ||
432 | list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) { | |
433 | if (uevent->mc != mc) | |
434 | continue; | |
435 | ||
436 | list_del(&uevent->list); | |
437 | kfree(uevent); | |
438 | } | |
439 | } | |
440 | ||
75216638 SH |
441 | static int ucma_free_ctx(struct ucma_context *ctx) |
442 | { | |
443 | int events_reported; | |
444 | ||
445 | /* No new events will be generated after destroying the id. */ | |
446 | rdma_destroy_id(ctx->cm_id); | |
447 | ||
c8f6a362 SH |
448 | ucma_cleanup_multicast(ctx); |
449 | ||
75216638 SH |
450 | /* Cleanup events not yet reported to the user. */ |
451 | mutex_lock(&ctx->file->mut); | |
452 | ucma_cleanup_events(ctx); | |
453 | list_del(&ctx->list); | |
454 | mutex_unlock(&ctx->file->mut); | |
455 | ||
456 | events_reported = ctx->events_reported; | |
457 | kfree(ctx); | |
458 | return events_reported; | |
459 | } | |
460 | ||
461 | static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf, | |
462 | int in_len, int out_len) | |
463 | { | |
464 | struct rdma_ucm_destroy_id cmd; | |
465 | struct rdma_ucm_destroy_id_resp resp; | |
466 | struct ucma_context *ctx; | |
467 | int ret = 0; | |
468 | ||
469 | if (out_len < sizeof(resp)) | |
470 | return -ENOSPC; | |
471 | ||
472 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
473 | return -EFAULT; | |
474 | ||
475 | mutex_lock(&mut); | |
476 | ctx = _ucma_find_context(cmd.id, file); | |
477 | if (!IS_ERR(ctx)) | |
478 | idr_remove(&ctx_idr, ctx->id); | |
479 | mutex_unlock(&mut); | |
480 | ||
481 | if (IS_ERR(ctx)) | |
482 | return PTR_ERR(ctx); | |
483 | ||
484 | ucma_put_ctx(ctx); | |
485 | wait_for_completion(&ctx->comp); | |
486 | resp.events_reported = ucma_free_ctx(ctx); | |
487 | ||
488 | if (copy_to_user((void __user *)(unsigned long)cmd.response, | |
489 | &resp, sizeof(resp))) | |
490 | ret = -EFAULT; | |
491 | ||
492 | return ret; | |
493 | } | |
494 | ||
495 | static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf, | |
496 | int in_len, int out_len) | |
497 | { | |
498 | struct rdma_ucm_bind_addr cmd; | |
499 | struct ucma_context *ctx; | |
500 | int ret; | |
501 | ||
502 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
503 | return -EFAULT; | |
504 | ||
505 | ctx = ucma_get_ctx(file, cmd.id); | |
506 | if (IS_ERR(ctx)) | |
507 | return PTR_ERR(ctx); | |
508 | ||
509 | ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); | |
510 | ucma_put_ctx(ctx); | |
511 | return ret; | |
512 | } | |
513 | ||
514 | static ssize_t ucma_resolve_addr(struct ucma_file *file, | |
515 | const char __user *inbuf, | |
516 | int in_len, int out_len) | |
517 | { | |
518 | struct rdma_ucm_resolve_addr cmd; | |
519 | struct ucma_context *ctx; | |
520 | int ret; | |
521 | ||
522 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
523 | return -EFAULT; | |
524 | ||
525 | ctx = ucma_get_ctx(file, cmd.id); | |
526 | if (IS_ERR(ctx)) | |
527 | return PTR_ERR(ctx); | |
528 | ||
529 | ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, | |
530 | (struct sockaddr *) &cmd.dst_addr, | |
531 | cmd.timeout_ms); | |
532 | ucma_put_ctx(ctx); | |
533 | return ret; | |
534 | } | |
535 | ||
536 | static ssize_t ucma_resolve_route(struct ucma_file *file, | |
537 | const char __user *inbuf, | |
538 | int in_len, int out_len) | |
539 | { | |
540 | struct rdma_ucm_resolve_route cmd; | |
541 | struct ucma_context *ctx; | |
542 | int ret; | |
543 | ||
544 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
545 | return -EFAULT; | |
546 | ||
547 | ctx = ucma_get_ctx(file, cmd.id); | |
548 | if (IS_ERR(ctx)) | |
549 | return PTR_ERR(ctx); | |
550 | ||
551 | ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms); | |
552 | ucma_put_ctx(ctx); | |
553 | return ret; | |
554 | } | |
555 | ||
556 | static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp, | |
557 | struct rdma_route *route) | |
558 | { | |
559 | struct rdma_dev_addr *dev_addr; | |
560 | ||
561 | resp->num_paths = route->num_paths; | |
562 | switch (route->num_paths) { | |
563 | case 0: | |
564 | dev_addr = &route->addr.dev_addr; | |
565 | ib_addr_get_dgid(dev_addr, | |
566 | (union ib_gid *) &resp->ib_route[0].dgid); | |
567 | ib_addr_get_sgid(dev_addr, | |
568 | (union ib_gid *) &resp->ib_route[0].sgid); | |
569 | resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); | |
570 | break; | |
571 | case 2: | |
572 | ib_copy_path_rec_to_user(&resp->ib_route[1], | |
573 | &route->path_rec[1]); | |
574 | /* fall through */ | |
575 | case 1: | |
576 | ib_copy_path_rec_to_user(&resp->ib_route[0], | |
577 | &route->path_rec[0]); | |
578 | break; | |
579 | default: | |
580 | break; | |
581 | } | |
582 | } | |
583 | ||
584 | static ssize_t ucma_query_route(struct ucma_file *file, | |
585 | const char __user *inbuf, | |
586 | int in_len, int out_len) | |
587 | { | |
588 | struct rdma_ucm_query_route cmd; | |
589 | struct rdma_ucm_query_route_resp resp; | |
590 | struct ucma_context *ctx; | |
591 | struct sockaddr *addr; | |
592 | int ret = 0; | |
593 | ||
594 | if (out_len < sizeof(resp)) | |
595 | return -ENOSPC; | |
596 | ||
597 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
598 | return -EFAULT; | |
599 | ||
600 | ctx = ucma_get_ctx(file, cmd.id); | |
601 | if (IS_ERR(ctx)) | |
602 | return PTR_ERR(ctx); | |
603 | ||
604 | memset(&resp, 0, sizeof resp); | |
3f446754 | 605 | addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr; |
75216638 SH |
606 | memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ? |
607 | sizeof(struct sockaddr_in) : | |
608 | sizeof(struct sockaddr_in6)); | |
3f446754 | 609 | addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr; |
75216638 SH |
610 | memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ? |
611 | sizeof(struct sockaddr_in) : | |
612 | sizeof(struct sockaddr_in6)); | |
613 | if (!ctx->cm_id->device) | |
614 | goto out; | |
615 | ||
9cda779c | 616 | resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid; |
75216638 SH |
617 | resp.port_num = ctx->cm_id->port_num; |
618 | switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) { | |
619 | case RDMA_TRANSPORT_IB: | |
620 | ucma_copy_ib_route(&resp, &ctx->cm_id->route); | |
621 | break; | |
622 | default: | |
623 | break; | |
624 | } | |
625 | ||
626 | out: | |
627 | if (copy_to_user((void __user *)(unsigned long)cmd.response, | |
628 | &resp, sizeof(resp))) | |
629 | ret = -EFAULT; | |
630 | ||
631 | ucma_put_ctx(ctx); | |
632 | return ret; | |
633 | } | |
634 | ||
635 | static void ucma_copy_conn_param(struct rdma_conn_param *dst, | |
636 | struct rdma_ucm_conn_param *src) | |
637 | { | |
638 | dst->private_data = src->private_data; | |
639 | dst->private_data_len = src->private_data_len; | |
640 | dst->responder_resources =src->responder_resources; | |
641 | dst->initiator_depth = src->initiator_depth; | |
642 | dst->flow_control = src->flow_control; | |
643 | dst->retry_count = src->retry_count; | |
644 | dst->rnr_retry_count = src->rnr_retry_count; | |
645 | dst->srq = src->srq; | |
646 | dst->qp_num = src->qp_num; | |
647 | } | |
648 | ||
649 | static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf, | |
650 | int in_len, int out_len) | |
651 | { | |
652 | struct rdma_ucm_connect cmd; | |
653 | struct rdma_conn_param conn_param; | |
654 | struct ucma_context *ctx; | |
655 | int ret; | |
656 | ||
657 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
658 | return -EFAULT; | |
659 | ||
660 | if (!cmd.conn_param.valid) | |
661 | return -EINVAL; | |
662 | ||
663 | ctx = ucma_get_ctx(file, cmd.id); | |
664 | if (IS_ERR(ctx)) | |
665 | return PTR_ERR(ctx); | |
666 | ||
667 | ucma_copy_conn_param(&conn_param, &cmd.conn_param); | |
668 | ret = rdma_connect(ctx->cm_id, &conn_param); | |
669 | ucma_put_ctx(ctx); | |
670 | return ret; | |
671 | } | |
672 | ||
673 | static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf, | |
674 | int in_len, int out_len) | |
675 | { | |
676 | struct rdma_ucm_listen cmd; | |
677 | struct ucma_context *ctx; | |
678 | int ret; | |
679 | ||
680 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
681 | return -EFAULT; | |
682 | ||
683 | ctx = ucma_get_ctx(file, cmd.id); | |
684 | if (IS_ERR(ctx)) | |
685 | return PTR_ERR(ctx); | |
686 | ||
687 | ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ? | |
688 | cmd.backlog : UCMA_MAX_BACKLOG; | |
689 | ret = rdma_listen(ctx->cm_id, ctx->backlog); | |
690 | ucma_put_ctx(ctx); | |
691 | return ret; | |
692 | } | |
693 | ||
694 | static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf, | |
695 | int in_len, int out_len) | |
696 | { | |
697 | struct rdma_ucm_accept cmd; | |
698 | struct rdma_conn_param conn_param; | |
699 | struct ucma_context *ctx; | |
700 | int ret; | |
701 | ||
702 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
703 | return -EFAULT; | |
704 | ||
705 | ctx = ucma_get_ctx(file, cmd.id); | |
706 | if (IS_ERR(ctx)) | |
707 | return PTR_ERR(ctx); | |
708 | ||
709 | if (cmd.conn_param.valid) { | |
710 | ctx->uid = cmd.uid; | |
711 | ucma_copy_conn_param(&conn_param, &cmd.conn_param); | |
712 | ret = rdma_accept(ctx->cm_id, &conn_param); | |
713 | } else | |
714 | ret = rdma_accept(ctx->cm_id, NULL); | |
715 | ||
716 | ucma_put_ctx(ctx); | |
717 | return ret; | |
718 | } | |
719 | ||
720 | static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf, | |
721 | int in_len, int out_len) | |
722 | { | |
723 | struct rdma_ucm_reject cmd; | |
724 | struct ucma_context *ctx; | |
725 | int ret; | |
726 | ||
727 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
728 | return -EFAULT; | |
729 | ||
730 | ctx = ucma_get_ctx(file, cmd.id); | |
731 | if (IS_ERR(ctx)) | |
732 | return PTR_ERR(ctx); | |
733 | ||
734 | ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len); | |
735 | ucma_put_ctx(ctx); | |
736 | return ret; | |
737 | } | |
738 | ||
739 | static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf, | |
740 | int in_len, int out_len) | |
741 | { | |
742 | struct rdma_ucm_disconnect cmd; | |
743 | struct ucma_context *ctx; | |
744 | int ret; | |
745 | ||
746 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
747 | return -EFAULT; | |
748 | ||
749 | ctx = ucma_get_ctx(file, cmd.id); | |
750 | if (IS_ERR(ctx)) | |
751 | return PTR_ERR(ctx); | |
752 | ||
753 | ret = rdma_disconnect(ctx->cm_id); | |
754 | ucma_put_ctx(ctx); | |
755 | return ret; | |
756 | } | |
757 | ||
758 | static ssize_t ucma_init_qp_attr(struct ucma_file *file, | |
759 | const char __user *inbuf, | |
760 | int in_len, int out_len) | |
761 | { | |
762 | struct rdma_ucm_init_qp_attr cmd; | |
763 | struct ib_uverbs_qp_attr resp; | |
764 | struct ucma_context *ctx; | |
765 | struct ib_qp_attr qp_attr; | |
766 | int ret; | |
767 | ||
768 | if (out_len < sizeof(resp)) | |
769 | return -ENOSPC; | |
770 | ||
771 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
772 | return -EFAULT; | |
773 | ||
774 | ctx = ucma_get_ctx(file, cmd.id); | |
775 | if (IS_ERR(ctx)) | |
776 | return PTR_ERR(ctx); | |
777 | ||
778 | resp.qp_attr_mask = 0; | |
779 | memset(&qp_attr, 0, sizeof qp_attr); | |
780 | qp_attr.qp_state = cmd.qp_state; | |
781 | ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask); | |
782 | if (ret) | |
783 | goto out; | |
784 | ||
785 | ib_copy_qp_attr_to_user(&resp, &qp_attr); | |
786 | if (copy_to_user((void __user *)(unsigned long)cmd.response, | |
787 | &resp, sizeof(resp))) | |
788 | ret = -EFAULT; | |
789 | ||
790 | out: | |
791 | ucma_put_ctx(ctx); | |
792 | return ret; | |
793 | } | |
794 | ||
7ce86409 SH |
795 | static int ucma_set_option_id(struct ucma_context *ctx, int optname, |
796 | void *optval, size_t optlen) | |
797 | { | |
798 | int ret = 0; | |
799 | ||
800 | switch (optname) { | |
801 | case RDMA_OPTION_ID_TOS: | |
802 | if (optlen != sizeof(u8)) { | |
803 | ret = -EINVAL; | |
804 | break; | |
805 | } | |
806 | rdma_set_service_type(ctx->cm_id, *((u8 *) optval)); | |
807 | break; | |
808 | default: | |
809 | ret = -ENOSYS; | |
810 | } | |
811 | ||
812 | return ret; | |
813 | } | |
814 | ||
815 | static int ucma_set_option_level(struct ucma_context *ctx, int level, | |
816 | int optname, void *optval, size_t optlen) | |
817 | { | |
818 | int ret; | |
819 | ||
820 | switch (level) { | |
821 | case RDMA_OPTION_ID: | |
822 | ret = ucma_set_option_id(ctx, optname, optval, optlen); | |
823 | break; | |
824 | default: | |
825 | ret = -ENOSYS; | |
826 | } | |
827 | ||
828 | return ret; | |
829 | } | |
830 | ||
831 | static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf, | |
832 | int in_len, int out_len) | |
833 | { | |
834 | struct rdma_ucm_set_option cmd; | |
835 | struct ucma_context *ctx; | |
836 | void *optval; | |
837 | int ret; | |
838 | ||
839 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
840 | return -EFAULT; | |
841 | ||
842 | ctx = ucma_get_ctx(file, cmd.id); | |
843 | if (IS_ERR(ctx)) | |
844 | return PTR_ERR(ctx); | |
845 | ||
846 | optval = kmalloc(cmd.optlen, GFP_KERNEL); | |
847 | if (!optval) { | |
848 | ret = -ENOMEM; | |
849 | goto out1; | |
850 | } | |
851 | ||
852 | if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval, | |
853 | cmd.optlen)) { | |
854 | ret = -EFAULT; | |
855 | goto out2; | |
856 | } | |
857 | ||
858 | ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval, | |
859 | cmd.optlen); | |
860 | out2: | |
861 | kfree(optval); | |
862 | out1: | |
863 | ucma_put_ctx(ctx); | |
864 | return ret; | |
865 | } | |
866 | ||
75216638 SH |
867 | static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, |
868 | int in_len, int out_len) | |
869 | { | |
870 | struct rdma_ucm_notify cmd; | |
871 | struct ucma_context *ctx; | |
872 | int ret; | |
873 | ||
874 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
875 | return -EFAULT; | |
876 | ||
877 | ctx = ucma_get_ctx(file, cmd.id); | |
878 | if (IS_ERR(ctx)) | |
879 | return PTR_ERR(ctx); | |
880 | ||
881 | ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); | |
882 | ucma_put_ctx(ctx); | |
883 | return ret; | |
884 | } | |
885 | ||
c8f6a362 SH |
886 | static ssize_t ucma_join_multicast(struct ucma_file *file, |
887 | const char __user *inbuf, | |
888 | int in_len, int out_len) | |
889 | { | |
890 | struct rdma_ucm_join_mcast cmd; | |
891 | struct rdma_ucm_create_id_resp resp; | |
892 | struct ucma_context *ctx; | |
893 | struct ucma_multicast *mc; | |
894 | int ret; | |
895 | ||
896 | if (out_len < sizeof(resp)) | |
897 | return -ENOSPC; | |
898 | ||
899 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
900 | return -EFAULT; | |
901 | ||
902 | ctx = ucma_get_ctx(file, cmd.id); | |
903 | if (IS_ERR(ctx)) | |
904 | return PTR_ERR(ctx); | |
905 | ||
906 | mutex_lock(&file->mut); | |
907 | mc = ucma_alloc_multicast(ctx); | |
6aea938f JB |
908 | if (!mc) { |
909 | ret = -ENOMEM; | |
c8f6a362 SH |
910 | goto err1; |
911 | } | |
912 | ||
913 | mc->uid = cmd.uid; | |
914 | memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr); | |
3f446754 | 915 | ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc); |
c8f6a362 SH |
916 | if (ret) |
917 | goto err2; | |
918 | ||
919 | resp.id = mc->id; | |
920 | if (copy_to_user((void __user *)(unsigned long)cmd.response, | |
921 | &resp, sizeof(resp))) { | |
922 | ret = -EFAULT; | |
923 | goto err3; | |
924 | } | |
925 | ||
926 | mutex_unlock(&file->mut); | |
927 | ucma_put_ctx(ctx); | |
928 | return 0; | |
929 | ||
930 | err3: | |
3f446754 | 931 | rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr); |
c8f6a362 SH |
932 | ucma_cleanup_mc_events(mc); |
933 | err2: | |
934 | mutex_lock(&mut); | |
935 | idr_remove(&multicast_idr, mc->id); | |
936 | mutex_unlock(&mut); | |
937 | list_del(&mc->list); | |
938 | kfree(mc); | |
939 | err1: | |
940 | mutex_unlock(&file->mut); | |
941 | ucma_put_ctx(ctx); | |
942 | return ret; | |
943 | } | |
944 | ||
945 | static ssize_t ucma_leave_multicast(struct ucma_file *file, | |
946 | const char __user *inbuf, | |
947 | int in_len, int out_len) | |
948 | { | |
949 | struct rdma_ucm_destroy_id cmd; | |
950 | struct rdma_ucm_destroy_id_resp resp; | |
951 | struct ucma_multicast *mc; | |
952 | int ret = 0; | |
953 | ||
954 | if (out_len < sizeof(resp)) | |
955 | return -ENOSPC; | |
956 | ||
957 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
958 | return -EFAULT; | |
959 | ||
960 | mutex_lock(&mut); | |
961 | mc = idr_find(&multicast_idr, cmd.id); | |
962 | if (!mc) | |
963 | mc = ERR_PTR(-ENOENT); | |
964 | else if (mc->ctx->file != file) | |
965 | mc = ERR_PTR(-EINVAL); | |
966 | else { | |
967 | idr_remove(&multicast_idr, mc->id); | |
968 | atomic_inc(&mc->ctx->ref); | |
969 | } | |
970 | mutex_unlock(&mut); | |
971 | ||
972 | if (IS_ERR(mc)) { | |
973 | ret = PTR_ERR(mc); | |
974 | goto out; | |
975 | } | |
976 | ||
3f446754 | 977 | rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr); |
c8f6a362 SH |
978 | mutex_lock(&mc->ctx->file->mut); |
979 | ucma_cleanup_mc_events(mc); | |
980 | list_del(&mc->list); | |
981 | mutex_unlock(&mc->ctx->file->mut); | |
982 | ||
983 | ucma_put_ctx(mc->ctx); | |
984 | resp.events_reported = mc->events_reported; | |
985 | kfree(mc); | |
986 | ||
987 | if (copy_to_user((void __user *)(unsigned long)cmd.response, | |
988 | &resp, sizeof(resp))) | |
989 | ret = -EFAULT; | |
990 | out: | |
991 | return ret; | |
992 | } | |
993 | ||
88314e4d SH |
994 | static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2) |
995 | { | |
996 | /* Acquire mutex's based on pointer comparison to prevent deadlock. */ | |
997 | if (file1 < file2) { | |
998 | mutex_lock(&file1->mut); | |
999 | mutex_lock(&file2->mut); | |
1000 | } else { | |
1001 | mutex_lock(&file2->mut); | |
1002 | mutex_lock(&file1->mut); | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2) | |
1007 | { | |
1008 | if (file1 < file2) { | |
1009 | mutex_unlock(&file2->mut); | |
1010 | mutex_unlock(&file1->mut); | |
1011 | } else { | |
1012 | mutex_unlock(&file1->mut); | |
1013 | mutex_unlock(&file2->mut); | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file) | |
1018 | { | |
1019 | struct ucma_event *uevent, *tmp; | |
1020 | ||
1021 | list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) | |
1022 | if (uevent->ctx == ctx) | |
1023 | list_move_tail(&uevent->list, &file->event_list); | |
1024 | } | |
1025 | ||
1026 | static ssize_t ucma_migrate_id(struct ucma_file *new_file, | |
1027 | const char __user *inbuf, | |
1028 | int in_len, int out_len) | |
1029 | { | |
1030 | struct rdma_ucm_migrate_id cmd; | |
1031 | struct rdma_ucm_migrate_resp resp; | |
1032 | struct ucma_context *ctx; | |
1033 | struct file *filp; | |
1034 | struct ucma_file *cur_file; | |
1035 | int ret = 0; | |
1036 | ||
1037 | if (copy_from_user(&cmd, inbuf, sizeof(cmd))) | |
1038 | return -EFAULT; | |
1039 | ||
1040 | /* Get current fd to protect against it being closed */ | |
1041 | filp = fget(cmd.fd); | |
1042 | if (!filp) | |
1043 | return -ENOENT; | |
1044 | ||
1045 | /* Validate current fd and prevent destruction of id. */ | |
1046 | ctx = ucma_get_ctx(filp->private_data, cmd.id); | |
1047 | if (IS_ERR(ctx)) { | |
1048 | ret = PTR_ERR(ctx); | |
1049 | goto file_put; | |
1050 | } | |
1051 | ||
1052 | cur_file = ctx->file; | |
1053 | if (cur_file == new_file) { | |
1054 | resp.events_reported = ctx->events_reported; | |
1055 | goto response; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Migrate events between fd's, maintaining order, and avoiding new | |
1060 | * events being added before existing events. | |
1061 | */ | |
1062 | ucma_lock_files(cur_file, new_file); | |
1063 | mutex_lock(&mut); | |
1064 | ||
1065 | list_move_tail(&ctx->list, &new_file->ctx_list); | |
1066 | ucma_move_events(ctx, new_file); | |
1067 | ctx->file = new_file; | |
1068 | resp.events_reported = ctx->events_reported; | |
1069 | ||
1070 | mutex_unlock(&mut); | |
1071 | ucma_unlock_files(cur_file, new_file); | |
1072 | ||
1073 | response: | |
1074 | if (copy_to_user((void __user *)(unsigned long)cmd.response, | |
1075 | &resp, sizeof(resp))) | |
1076 | ret = -EFAULT; | |
1077 | ||
1078 | ucma_put_ctx(ctx); | |
1079 | file_put: | |
1080 | fput(filp); | |
1081 | return ret; | |
1082 | } | |
1083 | ||
75216638 SH |
1084 | static ssize_t (*ucma_cmd_table[])(struct ucma_file *file, |
1085 | const char __user *inbuf, | |
1086 | int in_len, int out_len) = { | |
1087 | [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id, | |
1088 | [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id, | |
1089 | [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr, | |
1090 | [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr, | |
1091 | [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route, | |
1092 | [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route, | |
1093 | [RDMA_USER_CM_CMD_CONNECT] = ucma_connect, | |
1094 | [RDMA_USER_CM_CMD_LISTEN] = ucma_listen, | |
1095 | [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept, | |
1096 | [RDMA_USER_CM_CMD_REJECT] = ucma_reject, | |
1097 | [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect, | |
1098 | [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr, | |
1099 | [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event, | |
1100 | [RDMA_USER_CM_CMD_GET_OPTION] = NULL, | |
7ce86409 | 1101 | [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option, |
75216638 | 1102 | [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify, |
c8f6a362 SH |
1103 | [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast, |
1104 | [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast, | |
88314e4d | 1105 | [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id |
75216638 SH |
1106 | }; |
1107 | ||
1108 | static ssize_t ucma_write(struct file *filp, const char __user *buf, | |
1109 | size_t len, loff_t *pos) | |
1110 | { | |
1111 | struct ucma_file *file = filp->private_data; | |
1112 | struct rdma_ucm_cmd_hdr hdr; | |
1113 | ssize_t ret; | |
1114 | ||
1115 | if (len < sizeof(hdr)) | |
1116 | return -EINVAL; | |
1117 | ||
1118 | if (copy_from_user(&hdr, buf, sizeof(hdr))) | |
1119 | return -EFAULT; | |
1120 | ||
1121 | if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table)) | |
1122 | return -EINVAL; | |
1123 | ||
1124 | if (hdr.in + sizeof(hdr) > len) | |
1125 | return -EINVAL; | |
1126 | ||
1127 | if (!ucma_cmd_table[hdr.cmd]) | |
1128 | return -ENOSYS; | |
1129 | ||
1130 | ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out); | |
1131 | if (!ret) | |
1132 | ret = len; | |
1133 | ||
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait) | |
1138 | { | |
1139 | struct ucma_file *file = filp->private_data; | |
1140 | unsigned int mask = 0; | |
1141 | ||
1142 | poll_wait(filp, &file->poll_wait, wait); | |
1143 | ||
1144 | if (!list_empty(&file->event_list)) | |
1145 | mask = POLLIN | POLLRDNORM; | |
1146 | ||
1147 | return mask; | |
1148 | } | |
1149 | ||
f7a6117e RD |
1150 | /* |
1151 | * ucma_open() does not need the BKL: | |
1152 | * | |
1153 | * - no global state is referred to; | |
1154 | * - there is no ioctl method to race against; | |
1155 | * - no further module initialization is required for open to work | |
1156 | * after the device is registered. | |
1157 | */ | |
75216638 SH |
1158 | static int ucma_open(struct inode *inode, struct file *filp) |
1159 | { | |
1160 | struct ucma_file *file; | |
1161 | ||
1162 | file = kmalloc(sizeof *file, GFP_KERNEL); | |
1163 | if (!file) | |
1164 | return -ENOMEM; | |
1165 | ||
1166 | INIT_LIST_HEAD(&file->event_list); | |
1167 | INIT_LIST_HEAD(&file->ctx_list); | |
1168 | init_waitqueue_head(&file->poll_wait); | |
1169 | mutex_init(&file->mut); | |
1170 | ||
1171 | filp->private_data = file; | |
1172 | file->filp = filp; | |
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | static int ucma_close(struct inode *inode, struct file *filp) | |
1177 | { | |
1178 | struct ucma_file *file = filp->private_data; | |
1179 | struct ucma_context *ctx, *tmp; | |
1180 | ||
1181 | mutex_lock(&file->mut); | |
1182 | list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) { | |
1183 | mutex_unlock(&file->mut); | |
1184 | ||
1185 | mutex_lock(&mut); | |
1186 | idr_remove(&ctx_idr, ctx->id); | |
1187 | mutex_unlock(&mut); | |
1188 | ||
1189 | ucma_free_ctx(ctx); | |
1190 | mutex_lock(&file->mut); | |
1191 | } | |
1192 | mutex_unlock(&file->mut); | |
1193 | kfree(file); | |
1194 | return 0; | |
1195 | } | |
1196 | ||
2b8693c0 | 1197 | static const struct file_operations ucma_fops = { |
75216638 SH |
1198 | .owner = THIS_MODULE, |
1199 | .open = ucma_open, | |
1200 | .release = ucma_close, | |
1201 | .write = ucma_write, | |
1202 | .poll = ucma_poll, | |
1203 | }; | |
1204 | ||
1205 | static struct miscdevice ucma_misc = { | |
1206 | .minor = MISC_DYNAMIC_MINOR, | |
1207 | .name = "rdma_cm", | |
1208 | .fops = &ucma_fops, | |
1209 | }; | |
1210 | ||
1211 | static ssize_t show_abi_version(struct device *dev, | |
1212 | struct device_attribute *attr, | |
1213 | char *buf) | |
1214 | { | |
1215 | return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION); | |
1216 | } | |
1217 | static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); | |
1218 | ||
1219 | static int __init ucma_init(void) | |
1220 | { | |
1221 | int ret; | |
1222 | ||
1223 | ret = misc_register(&ucma_misc); | |
1224 | if (ret) | |
1225 | return ret; | |
1226 | ||
1227 | ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version); | |
1228 | if (ret) { | |
1229 | printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n"); | |
1230 | goto err; | |
1231 | } | |
1232 | return 0; | |
1233 | err: | |
1234 | misc_deregister(&ucma_misc); | |
1235 | return ret; | |
1236 | } | |
1237 | ||
1238 | static void __exit ucma_cleanup(void) | |
1239 | { | |
1240 | device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); | |
1241 | misc_deregister(&ucma_misc); | |
1242 | idr_destroy(&ctx_idr); | |
1243 | } | |
1244 | ||
1245 | module_init(ucma_init); | |
1246 | module_exit(ucma_cleanup); |