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