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