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Linux 2.6.21
[linux/fpc-iii.git] / drivers / infiniband / core / ucma.c
blobc859134c1daa3a0d73306f517bebc1c3920a949d
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>
34 #include <linux/mutex.h>
35 #include <linux/poll.h>
36 #include <linux/idr.h>
37 #include <linux/in.h>
38 #include <linux/in6.h>
39 #include <linux/miscdevice.h>
40
41 #include <rdma/rdma_user_cm.h>
42 #include <rdma/ib_marshall.h>
43 #include <rdma/rdma_cm.h>
44
45 MODULE_AUTHOR("Sean Hefty");
46 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
47 MODULE_LICENSE("Dual BSD/GPL");
48
49 enum {
50 UCMA_MAX_BACKLOG = 128
51 };
52
53 struct ucma_file {
54 struct mutex mut;
55 struct file *filp;
56 struct list_head ctx_list;
57 struct list_head event_list;
58 wait_queue_head_t poll_wait;
59 };
60
61 struct ucma_context {
62 int id;
63 struct completion comp;
64 atomic_t ref;
65 int events_reported;
66 int backlog;
67
68 struct ucma_file *file;
69 struct rdma_cm_id *cm_id;
70 u64 uid;
71
72 struct list_head list;
73 struct list_head mc_list;
74 };
75
76 struct ucma_multicast {
77 struct ucma_context *ctx;
78 int id;
79 int events_reported;
80
81 u64 uid;
82 struct list_head list;
83 struct sockaddr addr;
84 u8 pad[sizeof(struct sockaddr_in6) -
85 sizeof(struct sockaddr)];
86 };
87
88 struct ucma_event {
89 struct ucma_context *ctx;
90 struct ucma_multicast *mc;
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);
98 static DEFINE_IDR(multicast_idr);
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);
142 INIT_LIST_HEAD(&ctx->mc_list);
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
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
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;
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 }
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;
260 if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
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) {
269 ret = -ENOMEM;
270 kfree(uevent);
271 goto out;
272 }
273 ctx->backlog--;
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;
283 }
284
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)) {
309 if (file->filp->f_flags & O_NONBLOCK) {
310 ret = -EAGAIN;
311 break;
312 }
313
314 if (signal_pending(current)) {
315 ret = -ERESTARTSYS;
316 break;
317 }
318
319 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
320 mutex_unlock(&file->mut);
321 schedule();
322 mutex_lock(&file->mut);
323 finish_wait(&file->poll_wait, &wait);
324 }
325
326 if (ret)
327 goto done;
328
329 uevent = list_entry(file->event_list.next, struct ucma_event, list);
330
331 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
332 ctx = ucma_alloc_ctx(file);
333 if (!ctx) {
334 ret = -ENOMEM;
335 goto done;
336 }
337 uevent->ctx->backlog++;
338 ctx->cm_id = uevent->cm_id;
339 ctx->cm_id->context = ctx;
340 uevent->resp.id = ctx->id;
341 }
342
343 if (copy_to_user((void __user *)(unsigned long)cmd.response,
344 &uevent->resp, sizeof uevent->resp)) {
345 ret = -EFAULT;
346 goto done;
347 }
348
349 list_del(&uevent->list);
350 uevent->ctx->events_reported++;
351 if (uevent->mc)
352 uevent->mc->events_reported++;
353 kfree(uevent);
354 done:
355 mutex_unlock(&file->mut);
356 return ret;
357 }
358
359 static ssize_t ucma_create_id(struct ucma_file *file,
360 const char __user *inbuf,
361 int in_len, int out_len)
362 {
363 struct rdma_ucm_create_id cmd;
364 struct rdma_ucm_create_id_resp resp;
365 struct ucma_context *ctx;
366 int ret;
367
368 if (out_len < sizeof(resp))
369 return -ENOSPC;
370
371 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
372 return -EFAULT;
373
374 mutex_lock(&file->mut);
375 ctx = ucma_alloc_ctx(file);
376 mutex_unlock(&file->mut);
377 if (!ctx)
378 return -ENOMEM;
379
380 ctx->uid = cmd.uid;
381 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
382 if (IS_ERR(ctx->cm_id)) {
383 ret = PTR_ERR(ctx->cm_id);
384 goto err1;
385 }
386
387 resp.id = ctx->id;
388 if (copy_to_user((void __user *)(unsigned long)cmd.response,
389 &resp, sizeof(resp))) {
390 ret = -EFAULT;
391 goto err2;
392 }
393 return 0;
394
395 err2:
396 rdma_destroy_id(ctx->cm_id);
397 err1:
398 mutex_lock(&mut);
399 idr_remove(&ctx_idr, ctx->id);
400 mutex_unlock(&mut);
401 kfree(ctx);
402 return ret;
403 }
404
405 static void ucma_cleanup_multicast(struct ucma_context *ctx)
406 {
407 struct ucma_multicast *mc, *tmp;
408
409 mutex_lock(&mut);
410 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
411 list_del(&mc->list);
412 idr_remove(&multicast_idr, mc->id);
413 kfree(mc);
414 }
415 mutex_unlock(&mut);
416 }
417
418 static void ucma_cleanup_events(struct ucma_context *ctx)
419 {
420 struct ucma_event *uevent, *tmp;
421
422 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
423 if (uevent->ctx != ctx)
424 continue;
425
426 list_del(&uevent->list);
427
428 /* clear incoming connections. */
429 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
430 rdma_destroy_id(uevent->cm_id);
431
432 kfree(uevent);
433 }
434 }
435
436 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
437 {
438 struct ucma_event *uevent, *tmp;
439
440 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
441 if (uevent->mc != mc)
442 continue;
443
444 list_del(&uevent->list);
445 kfree(uevent);
446 }
447 }
448
449 static int ucma_free_ctx(struct ucma_context *ctx)
450 {
451 int events_reported;
452
453 /* No new events will be generated after destroying the id. */
454 rdma_destroy_id(ctx->cm_id);
455
456 ucma_cleanup_multicast(ctx);
457
458 /* Cleanup events not yet reported to the user. */
459 mutex_lock(&ctx->file->mut);
460 ucma_cleanup_events(ctx);
461 list_del(&ctx->list);
462 mutex_unlock(&ctx->file->mut);
463
464 events_reported = ctx->events_reported;
465 kfree(ctx);
466 return events_reported;
467 }
468
469 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
470 int in_len, int out_len)
471 {
472 struct rdma_ucm_destroy_id cmd;
473 struct rdma_ucm_destroy_id_resp resp;
474 struct ucma_context *ctx;
475 int ret = 0;
476
477 if (out_len < sizeof(resp))
478 return -ENOSPC;
479
480 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
481 return -EFAULT;
482
483 mutex_lock(&mut);
484 ctx = _ucma_find_context(cmd.id, file);
485 if (!IS_ERR(ctx))
486 idr_remove(&ctx_idr, ctx->id);
487 mutex_unlock(&mut);
488
489 if (IS_ERR(ctx))
490 return PTR_ERR(ctx);
491
492 ucma_put_ctx(ctx);
493 wait_for_completion(&ctx->comp);
494 resp.events_reported = ucma_free_ctx(ctx);
495
496 if (copy_to_user((void __user *)(unsigned long)cmd.response,
497 &resp, sizeof(resp)))
498 ret = -EFAULT;
499
500 return ret;
501 }
502
503 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
504 int in_len, int out_len)
505 {
506 struct rdma_ucm_bind_addr cmd;
507 struct ucma_context *ctx;
508 int ret;
509
510 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
511 return -EFAULT;
512
513 ctx = ucma_get_ctx(file, cmd.id);
514 if (IS_ERR(ctx))
515 return PTR_ERR(ctx);
516
517 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
518 ucma_put_ctx(ctx);
519 return ret;
520 }
521
522 static ssize_t ucma_resolve_addr(struct ucma_file *file,
523 const char __user *inbuf,
524 int in_len, int out_len)
525 {
526 struct rdma_ucm_resolve_addr cmd;
527 struct ucma_context *ctx;
528 int ret;
529
530 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
531 return -EFAULT;
532
533 ctx = ucma_get_ctx(file, cmd.id);
534 if (IS_ERR(ctx))
535 return PTR_ERR(ctx);
536
537 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
538 (struct sockaddr *) &cmd.dst_addr,
539 cmd.timeout_ms);
540 ucma_put_ctx(ctx);
541 return ret;
542 }
543
544 static ssize_t ucma_resolve_route(struct ucma_file *file,
545 const char __user *inbuf,
546 int in_len, int out_len)
547 {
548 struct rdma_ucm_resolve_route cmd;
549 struct ucma_context *ctx;
550 int ret;
551
552 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
553 return -EFAULT;
554
555 ctx = ucma_get_ctx(file, cmd.id);
556 if (IS_ERR(ctx))
557 return PTR_ERR(ctx);
558
559 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
560 ucma_put_ctx(ctx);
561 return ret;
562 }
563
564 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
565 struct rdma_route *route)
566 {
567 struct rdma_dev_addr *dev_addr;
568
569 resp->num_paths = route->num_paths;
570 switch (route->num_paths) {
571 case 0:
572 dev_addr = &route->addr.dev_addr;
573 ib_addr_get_dgid(dev_addr,
574 (union ib_gid *) &resp->ib_route[0].dgid);
575 ib_addr_get_sgid(dev_addr,
576 (union ib_gid *) &resp->ib_route[0].sgid);
577 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
578 break;
579 case 2:
580 ib_copy_path_rec_to_user(&resp->ib_route[1],
581 &route->path_rec[1]);
582 /* fall through */
583 case 1:
584 ib_copy_path_rec_to_user(&resp->ib_route[0],
585 &route->path_rec[0]);
586 break;
587 default:
588 break;
589 }
590 }
591
592 static ssize_t ucma_query_route(struct ucma_file *file,
593 const char __user *inbuf,
594 int in_len, int out_len)
595 {
596 struct rdma_ucm_query_route cmd;
597 struct rdma_ucm_query_route_resp resp;
598 struct ucma_context *ctx;
599 struct sockaddr *addr;
600 int ret = 0;
601
602 if (out_len < sizeof(resp))
603 return -ENOSPC;
604
605 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
606 return -EFAULT;
607
608 ctx = ucma_get_ctx(file, cmd.id);
609 if (IS_ERR(ctx))
610 return PTR_ERR(ctx);
611
612 memset(&resp, 0, sizeof resp);
613 addr = &ctx->cm_id->route.addr.src_addr;
614 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
615 sizeof(struct sockaddr_in) :
616 sizeof(struct sockaddr_in6));
617 addr = &ctx->cm_id->route.addr.dst_addr;
618 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
619 sizeof(struct sockaddr_in) :
620 sizeof(struct sockaddr_in6));
621 if (!ctx->cm_id->device)
622 goto out;
623
624 resp.node_guid = ctx->cm_id->device->node_guid;
625 resp.port_num = ctx->cm_id->port_num;
626 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
627 case RDMA_TRANSPORT_IB:
628 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
629 break;
630 default:
631 break;
632 }
633
634 out:
635 if (copy_to_user((void __user *)(unsigned long)cmd.response,
636 &resp, sizeof(resp)))
637 ret = -EFAULT;
638
639 ucma_put_ctx(ctx);
640 return ret;
641 }
642
643 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
644 struct rdma_ucm_conn_param *src)
645 {
646 dst->private_data = src->private_data;
647 dst->private_data_len = src->private_data_len;
648 dst->responder_resources =src->responder_resources;
649 dst->initiator_depth = src->initiator_depth;
650 dst->flow_control = src->flow_control;
651 dst->retry_count = src->retry_count;
652 dst->rnr_retry_count = src->rnr_retry_count;
653 dst->srq = src->srq;
654 dst->qp_num = src->qp_num;
655 }
656
657 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
658 int in_len, int out_len)
659 {
660 struct rdma_ucm_connect cmd;
661 struct rdma_conn_param conn_param;
662 struct ucma_context *ctx;
663 int ret;
664
665 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
666 return -EFAULT;
667
668 if (!cmd.conn_param.valid)
669 return -EINVAL;
670
671 ctx = ucma_get_ctx(file, cmd.id);
672 if (IS_ERR(ctx))
673 return PTR_ERR(ctx);
674
675 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
676 ret = rdma_connect(ctx->cm_id, &conn_param);
677 ucma_put_ctx(ctx);
678 return ret;
679 }
680
681 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
682 int in_len, int out_len)
683 {
684 struct rdma_ucm_listen cmd;
685 struct ucma_context *ctx;
686 int ret;
687
688 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
689 return -EFAULT;
690
691 ctx = ucma_get_ctx(file, cmd.id);
692 if (IS_ERR(ctx))
693 return PTR_ERR(ctx);
694
695 ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?
696 cmd.backlog : UCMA_MAX_BACKLOG;
697 ret = rdma_listen(ctx->cm_id, ctx->backlog);
698 ucma_put_ctx(ctx);
699 return ret;
700 }
701
702 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
703 int in_len, int out_len)
704 {
705 struct rdma_ucm_accept cmd;
706 struct rdma_conn_param conn_param;
707 struct ucma_context *ctx;
708 int ret;
709
710 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
711 return -EFAULT;
712
713 ctx = ucma_get_ctx(file, cmd.id);
714 if (IS_ERR(ctx))
715 return PTR_ERR(ctx);
716
717 if (cmd.conn_param.valid) {
718 ctx->uid = cmd.uid;
719 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
720 ret = rdma_accept(ctx->cm_id, &conn_param);
721 } else
722 ret = rdma_accept(ctx->cm_id, NULL);
723
724 ucma_put_ctx(ctx);
725 return ret;
726 }
727
728 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
729 int in_len, int out_len)
730 {
731 struct rdma_ucm_reject cmd;
732 struct ucma_context *ctx;
733 int ret;
734
735 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
736 return -EFAULT;
737
738 ctx = ucma_get_ctx(file, cmd.id);
739 if (IS_ERR(ctx))
740 return PTR_ERR(ctx);
741
742 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
743 ucma_put_ctx(ctx);
744 return ret;
745 }
746
747 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
748 int in_len, int out_len)
749 {
750 struct rdma_ucm_disconnect cmd;
751 struct ucma_context *ctx;
752 int ret;
753
754 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
755 return -EFAULT;
756
757 ctx = ucma_get_ctx(file, cmd.id);
758 if (IS_ERR(ctx))
759 return PTR_ERR(ctx);
760
761 ret = rdma_disconnect(ctx->cm_id);
762 ucma_put_ctx(ctx);
763 return ret;
764 }
765
766 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
767 const char __user *inbuf,
768 int in_len, int out_len)
769 {
770 struct rdma_ucm_init_qp_attr cmd;
771 struct ib_uverbs_qp_attr resp;
772 struct ucma_context *ctx;
773 struct ib_qp_attr qp_attr;
774 int ret;
775
776 if (out_len < sizeof(resp))
777 return -ENOSPC;
778
779 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
780 return -EFAULT;
781
782 ctx = ucma_get_ctx(file, cmd.id);
783 if (IS_ERR(ctx))
784 return PTR_ERR(ctx);
785
786 resp.qp_attr_mask = 0;
787 memset(&qp_attr, 0, sizeof qp_attr);
788 qp_attr.qp_state = cmd.qp_state;
789 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
790 if (ret)
791 goto out;
792
793 ib_copy_qp_attr_to_user(&resp, &qp_attr);
794 if (copy_to_user((void __user *)(unsigned long)cmd.response,
795 &resp, sizeof(resp)))
796 ret = -EFAULT;
797
798 out:
799 ucma_put_ctx(ctx);
800 return ret;
801 }
802
803 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
804 int in_len, int out_len)
805 {
806 struct rdma_ucm_notify cmd;
807 struct ucma_context *ctx;
808 int ret;
809
810 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
811 return -EFAULT;
812
813 ctx = ucma_get_ctx(file, cmd.id);
814 if (IS_ERR(ctx))
815 return PTR_ERR(ctx);
816
817 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
818 ucma_put_ctx(ctx);
819 return ret;
820 }
821
822 static ssize_t ucma_join_multicast(struct ucma_file *file,
823 const char __user *inbuf,
824 int in_len, int out_len)
825 {
826 struct rdma_ucm_join_mcast cmd;
827 struct rdma_ucm_create_id_resp resp;
828 struct ucma_context *ctx;
829 struct ucma_multicast *mc;
830 int ret;
831
832 if (out_len < sizeof(resp))
833 return -ENOSPC;
834
835 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
836 return -EFAULT;
837
838 ctx = ucma_get_ctx(file, cmd.id);
839 if (IS_ERR(ctx))
840 return PTR_ERR(ctx);
841
842 mutex_lock(&file->mut);
843 mc = ucma_alloc_multicast(ctx);
844 if (IS_ERR(mc)) {
845 ret = PTR_ERR(mc);
846 goto err1;
847 }
848
849 mc->uid = cmd.uid;
850 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
851 ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc);
852 if (ret)
853 goto err2;
854
855 resp.id = mc->id;
856 if (copy_to_user((void __user *)(unsigned long)cmd.response,
857 &resp, sizeof(resp))) {
858 ret = -EFAULT;
859 goto err3;
860 }
861
862 mutex_unlock(&file->mut);
863 ucma_put_ctx(ctx);
864 return 0;
865
866 err3:
867 rdma_leave_multicast(ctx->cm_id, &mc->addr);
868 ucma_cleanup_mc_events(mc);
869 err2:
870 mutex_lock(&mut);
871 idr_remove(&multicast_idr, mc->id);
872 mutex_unlock(&mut);
873 list_del(&mc->list);
874 kfree(mc);
875 err1:
876 mutex_unlock(&file->mut);
877 ucma_put_ctx(ctx);
878 return ret;
879 }
880
881 static ssize_t ucma_leave_multicast(struct ucma_file *file,
882 const char __user *inbuf,
883 int in_len, int out_len)
884 {
885 struct rdma_ucm_destroy_id cmd;
886 struct rdma_ucm_destroy_id_resp resp;
887 struct ucma_multicast *mc;
888 int ret = 0;
889
890 if (out_len < sizeof(resp))
891 return -ENOSPC;
892
893 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
894 return -EFAULT;
895
896 mutex_lock(&mut);
897 mc = idr_find(&multicast_idr, cmd.id);
898 if (!mc)
899 mc = ERR_PTR(-ENOENT);
900 else if (mc->ctx->file != file)
901 mc = ERR_PTR(-EINVAL);
902 else {
903 idr_remove(&multicast_idr, mc->id);
904 atomic_inc(&mc->ctx->ref);
905 }
906 mutex_unlock(&mut);
907
908 if (IS_ERR(mc)) {
909 ret = PTR_ERR(mc);
910 goto out;
911 }
912
913 rdma_leave_multicast(mc->ctx->cm_id, &mc->addr);
914 mutex_lock(&mc->ctx->file->mut);
915 ucma_cleanup_mc_events(mc);
916 list_del(&mc->list);
917 mutex_unlock(&mc->ctx->file->mut);
918
919 ucma_put_ctx(mc->ctx);
920 resp.events_reported = mc->events_reported;
921 kfree(mc);
922
923 if (copy_to_user((void __user *)(unsigned long)cmd.response,
924 &resp, sizeof(resp)))
925 ret = -EFAULT;
926 out:
927 return ret;
928 }
929
930 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
931 const char __user *inbuf,
932 int in_len, int out_len) = {
933 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
934 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
935 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
936 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
937 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
938 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
939 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
940 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
941 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
942 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
943 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
944 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
945 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
946 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
947 [RDMA_USER_CM_CMD_SET_OPTION] = NULL,
948 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
949 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
950 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
951 };
952
953 static ssize_t ucma_write(struct file *filp, const char __user *buf,
954 size_t len, loff_t *pos)
955 {
956 struct ucma_file *file = filp->private_data;
957 struct rdma_ucm_cmd_hdr hdr;
958 ssize_t ret;
959
960 if (len < sizeof(hdr))
961 return -EINVAL;
962
963 if (copy_from_user(&hdr, buf, sizeof(hdr)))
964 return -EFAULT;
965
966 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
967 return -EINVAL;
968
969 if (hdr.in + sizeof(hdr) > len)
970 return -EINVAL;
971
972 if (!ucma_cmd_table[hdr.cmd])
973 return -ENOSYS;
974
975 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
976 if (!ret)
977 ret = len;
978
979 return ret;
980 }
981
982 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
983 {
984 struct ucma_file *file = filp->private_data;
985 unsigned int mask = 0;
986
987 poll_wait(filp, &file->poll_wait, wait);
988
989 if (!list_empty(&file->event_list))
990 mask = POLLIN | POLLRDNORM;
991
992 return mask;
993 }
994
995 static int ucma_open(struct inode *inode, struct file *filp)
996 {
997 struct ucma_file *file;
998
999 file = kmalloc(sizeof *file, GFP_KERNEL);
1000 if (!file)
1001 return -ENOMEM;
1002
1003 INIT_LIST_HEAD(&file->event_list);
1004 INIT_LIST_HEAD(&file->ctx_list);
1005 init_waitqueue_head(&file->poll_wait);
1006 mutex_init(&file->mut);
1007
1008 filp->private_data = file;
1009 file->filp = filp;
1010 return 0;
1011 }
1012
1013 static int ucma_close(struct inode *inode, struct file *filp)
1014 {
1015 struct ucma_file *file = filp->private_data;
1016 struct ucma_context *ctx, *tmp;
1017
1018 mutex_lock(&file->mut);
1019 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1020 mutex_unlock(&file->mut);
1021
1022 mutex_lock(&mut);
1023 idr_remove(&ctx_idr, ctx->id);
1024 mutex_unlock(&mut);
1025
1026 ucma_free_ctx(ctx);
1027 mutex_lock(&file->mut);
1028 }
1029 mutex_unlock(&file->mut);
1030 kfree(file);
1031 return 0;
1032 }
1033
1034 static const struct file_operations ucma_fops = {
1035 .owner = THIS_MODULE,
1036 .open = ucma_open,
1037 .release = ucma_close,
1038 .write = ucma_write,
1039 .poll = ucma_poll,
1040 };
1041
1042 static struct miscdevice ucma_misc = {
1043 .minor = MISC_DYNAMIC_MINOR,
1044 .name = "rdma_cm",
1045 .fops = &ucma_fops,
1046 };
1047
1048 static ssize_t show_abi_version(struct device *dev,
1049 struct device_attribute *attr,
1050 char *buf)
1051 {
1052 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1053 }
1054 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1055
1056 static int __init ucma_init(void)
1057 {
1058 int ret;
1059
1060 ret = misc_register(&ucma_misc);
1061 if (ret)
1062 return ret;
1063
1064 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1065 if (ret) {
1066 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1067 goto err;
1068 }
1069 return 0;
1070 err:
1071 misc_deregister(&ucma_misc);
1072 return ret;
1073 }
1074
1075 static void __exit ucma_cleanup(void)
1076 {
1077 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1078 misc_deregister(&ucma_misc);
1079 idr_destroy(&ctx_idr);
1080 }
1081
1082 module_init(ucma_init);
1083 module_exit(ucma_cleanup);
Linux with added FPC-III support