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/file.h>
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;
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)];
87 };
88
89 struct ucma_event {
90 struct ucma_context *ctx;
91 struct ucma_multicast *mc;
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);
99 static DEFINE_IDR(multicast_idr);
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);
143 INIT_LIST_HEAD(&ctx->mc_list);
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
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
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;
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 }
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;
261 if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
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) {
270 ret = -ENOMEM;
271 kfree(uevent);
272 goto out;
273 }
274 ctx->backlog--;
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;
284 }
285
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)) {
310 mutex_unlock(&file->mut);
311
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;
318
319 mutex_lock(&file->mut);
320 }
321
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++;
344 if (uevent->mc)
345 uevent->mc->events_reported++;
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
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
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
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
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
449 ucma_cleanup_multicast(ctx);
450
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
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
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
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
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
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,
1102 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1103 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1104 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
1105 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1106 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
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
1190 static const struct file_operations ucma_fops = {
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);
1240
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