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 #include <rdma/rdma_cm_ib.h>
46
47 MODULE_AUTHOR("Sean Hefty");
48 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
49 MODULE_LICENSE("Dual BSD/GPL");
50
51 enum {
52 UCMA_MAX_BACKLOG = 1024
53 };
54
55 struct ucma_file {
56 struct mutex mut;
57 struct file *filp;
58 struct list_head ctx_list;
59 struct list_head event_list;
60 wait_queue_head_t poll_wait;
61 };
62
63 struct ucma_context {
64 int id;
65 struct completion comp;
66 atomic_t ref;
67 int events_reported;
68 int backlog;
69
70 struct ucma_file *file;
71 struct rdma_cm_id *cm_id;
72 u64 uid;
73
74 struct list_head list;
75 struct list_head mc_list;
76 };
77
78 struct ucma_multicast {
79 struct ucma_context *ctx;
80 int id;
81 int events_reported;
82
83 u64 uid;
84 struct list_head list;
85 struct sockaddr_storage addr;
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
_ucma_find_context(int id,struct ucma_file * file)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
ucma_get_ctx(struct ucma_file * file,int id)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
ucma_put_ctx(struct ucma_context * ctx)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
ucma_alloc_ctx(struct ucma_file * file)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
ucma_alloc_multicast(struct ucma_context * ctx)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
ucma_copy_conn_event(struct rdma_ucm_conn_param * dst,struct rdma_conn_param * src)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
ucma_copy_ud_event(struct rdma_ucm_ud_param * dst,struct rdma_ud_param * src)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
ucma_set_event_context(struct ucma_context * ctx,struct rdma_cm_event * event,struct ucma_event * uevent)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
ucma_event_handler(struct rdma_cm_id * cm_id,struct rdma_cm_event * event)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 if (ctx->file->filp)
288 selwakeup(&ctx->file->filp->f_selinfo);
289 out:
290 mutex_unlock(&ctx->file->mut);
291 return ret;
292 }
293
ucma_get_event(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)294 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
295 int in_len, int out_len)
296 {
297 struct ucma_context *ctx;
298 struct rdma_ucm_get_event cmd;
299 struct ucma_event *uevent;
300 int ret = 0;
301 DEFINE_WAIT(wait);
302
303 if (out_len < sizeof uevent->resp)
304 return -ENOSPC;
305
306 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
307 return -EFAULT;
308
309 mutex_lock(&file->mut);
310 while (list_empty(&file->event_list)) {
311 mutex_unlock(&file->mut);
312
313 if (file->filp->f_flags & O_NONBLOCK)
314 return -EAGAIN;
315
316 if (wait_event_interruptible(file->poll_wait,
317 !list_empty(&file->event_list)))
318 return -ERESTARTSYS;
319
320 mutex_lock(&file->mut);
321 }
322
323 uevent = list_entry(file->event_list.next, struct ucma_event, list);
324
325 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
326 ctx = ucma_alloc_ctx(file);
327 if (!ctx) {
328 ret = -ENOMEM;
329 goto done;
330 }
331 uevent->ctx->backlog++;
332 ctx->cm_id = uevent->cm_id;
333 ctx->cm_id->context = ctx;
334 uevent->resp.id = ctx->id;
335 }
336
337 if (copy_to_user((void __user *)(unsigned long)cmd.response,
338 &uevent->resp, sizeof uevent->resp)) {
339 ret = -EFAULT;
340 goto done;
341 }
342
343 list_del(&uevent->list);
344 uevent->ctx->events_reported++;
345 if (uevent->mc)
346 uevent->mc->events_reported++;
347 kfree(uevent);
348 done:
349 mutex_unlock(&file->mut);
350 return ret;
351 }
352
ucma_create_id(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)353 static ssize_t ucma_create_id(struct ucma_file *file,
354 const char __user *inbuf,
355 int in_len, int out_len)
356 {
357 struct rdma_ucm_create_id cmd;
358 struct rdma_ucm_create_id_resp resp;
359 struct ucma_context *ctx;
360 int ret;
361
362 if (out_len < sizeof(resp))
363 return -ENOSPC;
364
365 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
366 return -EFAULT;
367
368 mutex_lock(&file->mut);
369 ctx = ucma_alloc_ctx(file);
370 mutex_unlock(&file->mut);
371 if (!ctx)
372 return -ENOMEM;
373
374 ctx->uid = cmd.uid;
375 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
376 if (IS_ERR(ctx->cm_id)) {
377 ret = PTR_ERR(ctx->cm_id);
378 goto err1;
379 }
380
381 resp.id = ctx->id;
382 if (copy_to_user((void __user *)(unsigned long)cmd.response,
383 &resp, sizeof(resp))) {
384 ret = -EFAULT;
385 goto err2;
386 }
387 return 0;
388
389 err2:
390 rdma_destroy_id(ctx->cm_id);
391 err1:
392 mutex_lock(&mut);
393 idr_remove(&ctx_idr, ctx->id);
394 mutex_unlock(&mut);
395 kfree(ctx);
396 return ret;
397 }
398
ucma_cleanup_multicast(struct ucma_context * ctx)399 static void ucma_cleanup_multicast(struct ucma_context *ctx)
400 {
401 struct ucma_multicast *mc, *tmp;
402
403 mutex_lock(&mut);
404 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
405 list_del(&mc->list);
406 idr_remove(&multicast_idr, mc->id);
407 kfree(mc);
408 }
409 mutex_unlock(&mut);
410 }
411
ucma_cleanup_events(struct ucma_context * ctx)412 static void ucma_cleanup_events(struct ucma_context *ctx)
413 {
414 struct ucma_event *uevent, *tmp;
415
416 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
417 if (uevent->ctx != ctx)
418 continue;
419
420 list_del(&uevent->list);
421
422 /* clear incoming connections. */
423 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
424 rdma_destroy_id(uevent->cm_id);
425
426 kfree(uevent);
427 }
428 }
429
ucma_cleanup_mc_events(struct ucma_multicast * mc)430 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
431 {
432 struct ucma_event *uevent, *tmp;
433
434 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
435 if (uevent->mc != mc)
436 continue;
437
438 list_del(&uevent->list);
439 kfree(uevent);
440 }
441 }
442
ucma_free_ctx(struct ucma_context * ctx)443 static int ucma_free_ctx(struct ucma_context *ctx)
444 {
445 int events_reported;
446
447 /* No new events will be generated after destroying the id. */
448 rdma_destroy_id(ctx->cm_id);
449
450 ucma_cleanup_multicast(ctx);
451
452 /* Cleanup events not yet reported to the user. */
453 mutex_lock(&ctx->file->mut);
454 ucma_cleanup_events(ctx);
455 list_del(&ctx->list);
456 mutex_unlock(&ctx->file->mut);
457
458 events_reported = ctx->events_reported;
459 kfree(ctx);
460 return events_reported;
461 }
462
ucma_destroy_id(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)463 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
464 int in_len, int out_len)
465 {
466 struct rdma_ucm_destroy_id cmd;
467 struct rdma_ucm_destroy_id_resp resp;
468 struct ucma_context *ctx;
469 int ret = 0;
470
471 if (out_len < sizeof(resp))
472 return -ENOSPC;
473
474 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
475 return -EFAULT;
476
477 mutex_lock(&mut);
478 ctx = _ucma_find_context(cmd.id, file);
479 if (!IS_ERR(ctx))
480 idr_remove(&ctx_idr, ctx->id);
481 mutex_unlock(&mut);
482
483 if (IS_ERR(ctx))
484 return PTR_ERR(ctx);
485
486 ucma_put_ctx(ctx);
487 wait_for_completion(&ctx->comp);
488 resp.events_reported = ucma_free_ctx(ctx);
489
490 if (copy_to_user((void __user *)(unsigned long)cmd.response,
491 &resp, sizeof(resp)))
492 ret = -EFAULT;
493
494 return ret;
495 }
496
ucma_bind_addr(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)497 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
498 int in_len, int out_len)
499 {
500 struct rdma_ucm_bind_addr cmd;
501 struct ucma_context *ctx;
502 int ret;
503
504 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
505 return -EFAULT;
506
507 ctx = ucma_get_ctx(file, cmd.id);
508 if (IS_ERR(ctx))
509 return PTR_ERR(ctx);
510
511 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
512 ucma_put_ctx(ctx);
513 return ret;
514 }
515
ucma_resolve_addr(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)516 static ssize_t ucma_resolve_addr(struct ucma_file *file,
517 const char __user *inbuf,
518 int in_len, int out_len)
519 {
520 struct rdma_ucm_resolve_addr cmd;
521 struct ucma_context *ctx;
522 int ret;
523
524 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
525 return -EFAULT;
526
527 ctx = ucma_get_ctx(file, cmd.id);
528 if (IS_ERR(ctx))
529 return PTR_ERR(ctx);
530
531 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
532 (struct sockaddr *) &cmd.dst_addr,
533 cmd.timeout_ms);
534 ucma_put_ctx(ctx);
535 return ret;
536 }
537
ucma_resolve_route(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)538 static ssize_t ucma_resolve_route(struct ucma_file *file,
539 const char __user *inbuf,
540 int in_len, int out_len)
541 {
542 struct rdma_ucm_resolve_route cmd;
543 struct ucma_context *ctx;
544 int ret;
545
546 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
547 return -EFAULT;
548
549 ctx = ucma_get_ctx(file, cmd.id);
550 if (IS_ERR(ctx))
551 return PTR_ERR(ctx);
552
553 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
554 ucma_put_ctx(ctx);
555 return ret;
556 }
557
ucma_copy_ib_route(struct rdma_ucm_query_route_resp * resp,struct rdma_route * route)558 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
559 struct rdma_route *route)
560 {
561 struct rdma_dev_addr *dev_addr;
562
563 resp->num_paths = route->num_paths;
564 switch (route->num_paths) {
565 case 0:
566 dev_addr = &route->addr.dev_addr;
567 rdma_addr_get_dgid(dev_addr,
568 (union ib_gid *) &resp->ib_route[0].dgid);
569 rdma_addr_get_sgid(dev_addr,
570 (union ib_gid *) &resp->ib_route[0].sgid);
571 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
572 break;
573 case 2:
574 ib_copy_path_rec_to_user(&resp->ib_route[1],
575 &route->path_rec[1]);
576 /* fall through */
577 case 1:
578 ib_copy_path_rec_to_user(&resp->ib_route[0],
579 &route->path_rec[0]);
580 break;
581 default:
582 break;
583 }
584 }
585
ucma_copy_iboe_route(struct rdma_ucm_query_route_resp * resp,struct rdma_route * route)586 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
587 struct rdma_route *route)
588 {
589 struct rdma_dev_addr *dev_addr;
590 struct net_device *dev;
591 u16 vid = 0;
592
593 resp->num_paths = route->num_paths;
594 switch (route->num_paths) {
595 case 0:
596 dev_addr = &route->addr.dev_addr;
597 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
598 if (dev) {
599 vid = rdma_vlan_dev_vlan_id(dev);
600 dev_put(dev);
601 }
602
603 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
604 dev_addr->dst_dev_addr, vid);
605 iboe_addr_get_sgid(dev_addr,
606 (union ib_gid *) &resp->ib_route[0].sgid);
607 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
608 break;
609 case 2:
610 ib_copy_path_rec_to_user(&resp->ib_route[1],
611 &route->path_rec[1]);
612 /* fall through */
613 case 1:
614 ib_copy_path_rec_to_user(&resp->ib_route[0],
615 &route->path_rec[0]);
616 break;
617 default:
618 break;
619 }
620 }
621
ucma_query_route(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)622 static ssize_t ucma_query_route(struct ucma_file *file,
623 const char __user *inbuf,
624 int in_len, int out_len)
625 {
626 struct rdma_ucm_query_route cmd;
627 struct rdma_ucm_query_route_resp resp;
628 struct ucma_context *ctx;
629 struct sockaddr *addr;
630 int ret = 0;
631
632 if (out_len < sizeof(resp))
633 return -ENOSPC;
634
635 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
636 return -EFAULT;
637
638 ctx = ucma_get_ctx(file, cmd.id);
639 if (IS_ERR(ctx))
640 return PTR_ERR(ctx);
641
642 memset(&resp, 0, sizeof resp);
643 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
644 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
645 sizeof(struct sockaddr_in) :
646 sizeof(struct sockaddr_in6));
647 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
648 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
649 sizeof(struct sockaddr_in) :
650 sizeof(struct sockaddr_in6));
651 if (!ctx->cm_id->device)
652 goto out;
653
654 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
655 resp.port_num = ctx->cm_id->port_num;
656 if (rdma_node_get_transport(ctx->cm_id->device->node_type) == RDMA_TRANSPORT_IB) {
657 switch (rdma_port_get_link_layer(ctx->cm_id->device, ctx->cm_id->port_num)) {
658 case IB_LINK_LAYER_INFINIBAND:
659 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
660 break;
661 case IB_LINK_LAYER_ETHERNET:
662 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
663 break;
664 default:
665 break;
666 }
667 }
668
669 out:
670 if (copy_to_user((void __user *)(unsigned long)cmd.response,
671 &resp, sizeof(resp)))
672 ret = -EFAULT;
673
674 ucma_put_ctx(ctx);
675 return ret;
676 }
677
ucma_copy_conn_param(struct rdma_conn_param * dst,struct rdma_ucm_conn_param * src)678 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
679 struct rdma_ucm_conn_param *src)
680 {
681 dst->private_data = src->private_data;
682 dst->private_data_len = src->private_data_len;
683 dst->responder_resources =src->responder_resources;
684 dst->initiator_depth = src->initiator_depth;
685 dst->flow_control = src->flow_control;
686 dst->retry_count = src->retry_count;
687 dst->rnr_retry_count = src->rnr_retry_count;
688 dst->srq = src->srq;
689 dst->qp_num = src->qp_num;
690 }
691
ucma_connect(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)692 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
693 int in_len, int out_len)
694 {
695 struct rdma_ucm_connect cmd;
696 struct rdma_conn_param conn_param;
697 struct ucma_context *ctx;
698 int ret;
699
700 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
701 return -EFAULT;
702
703 if (!cmd.conn_param.valid)
704 return -EINVAL;
705
706 ctx = ucma_get_ctx(file, cmd.id);
707 if (IS_ERR(ctx))
708 return PTR_ERR(ctx);
709
710 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
711 ret = rdma_connect(ctx->cm_id, &conn_param);
712 ucma_put_ctx(ctx);
713 return ret;
714 }
715
ucma_listen(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)716 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
717 int in_len, int out_len)
718 {
719 struct rdma_ucm_listen cmd;
720 struct ucma_context *ctx;
721 int ret;
722
723 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
724 return -EFAULT;
725
726 ctx = ucma_get_ctx(file, cmd.id);
727 if (IS_ERR(ctx))
728 return PTR_ERR(ctx);
729
730 ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?
731 cmd.backlog : UCMA_MAX_BACKLOG;
732 ret = rdma_listen(ctx->cm_id, ctx->backlog);
733 ucma_put_ctx(ctx);
734 return ret;
735 }
736
ucma_accept(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)737 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
738 int in_len, int out_len)
739 {
740 struct rdma_ucm_accept cmd;
741 struct rdma_conn_param conn_param;
742 struct ucma_context *ctx;
743 int ret;
744
745 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
746 return -EFAULT;
747
748 ctx = ucma_get_ctx(file, cmd.id);
749 if (IS_ERR(ctx))
750 return PTR_ERR(ctx);
751
752 if (cmd.conn_param.valid) {
753 ctx->uid = cmd.uid;
754 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
755 ret = rdma_accept(ctx->cm_id, &conn_param);
756 } else
757 ret = rdma_accept(ctx->cm_id, NULL);
758
759 ucma_put_ctx(ctx);
760 return ret;
761 }
762
ucma_reject(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)763 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
764 int in_len, int out_len)
765 {
766 struct rdma_ucm_reject cmd;
767 struct ucma_context *ctx;
768 int ret;
769
770 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
771 return -EFAULT;
772
773 ctx = ucma_get_ctx(file, cmd.id);
774 if (IS_ERR(ctx))
775 return PTR_ERR(ctx);
776
777 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
778 ucma_put_ctx(ctx);
779 return ret;
780 }
781
ucma_disconnect(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)782 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
783 int in_len, int out_len)
784 {
785 struct rdma_ucm_disconnect cmd;
786 struct ucma_context *ctx;
787 int ret;
788
789 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
790 return -EFAULT;
791
792 ctx = ucma_get_ctx(file, cmd.id);
793 if (IS_ERR(ctx))
794 return PTR_ERR(ctx);
795
796 ret = rdma_disconnect(ctx->cm_id);
797 ucma_put_ctx(ctx);
798 return ret;
799 }
800
ucma_init_qp_attr(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)801 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
802 const char __user *inbuf,
803 int in_len, int out_len)
804 {
805 struct rdma_ucm_init_qp_attr cmd;
806 struct ib_uverbs_qp_attr resp;
807 struct ucma_context *ctx;
808 struct ib_qp_attr qp_attr;
809 int ret;
810
811 if (out_len < sizeof(resp))
812 return -ENOSPC;
813
814 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
815 return -EFAULT;
816
817 ctx = ucma_get_ctx(file, cmd.id);
818 if (IS_ERR(ctx))
819 return PTR_ERR(ctx);
820
821 resp.qp_attr_mask = 0;
822 memset(&qp_attr, 0, sizeof qp_attr);
823 qp_attr.qp_state = cmd.qp_state;
824 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
825 if (ret)
826 goto out;
827
828 ib_copy_qp_attr_to_user(&resp, &qp_attr);
829 if (copy_to_user((void __user *)(unsigned long)cmd.response,
830 &resp, sizeof(resp)))
831 ret = -EFAULT;
832
833 out:
834 ucma_put_ctx(ctx);
835 return ret;
836 }
837
ucma_set_option_id(struct ucma_context * ctx,int optname,void * optval,size_t optlen)838 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
839 void *optval, size_t optlen)
840 {
841 int ret = 0;
842
843 switch (optname) {
844 case RDMA_OPTION_ID_TOS:
845 if (optlen != sizeof(u8)) {
846 ret = -EINVAL;
847 break;
848 }
849 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
850 break;
851 default:
852 ret = -ENOSYS;
853 }
854
855 return ret;
856 }
857
ucma_set_ib_path(struct ucma_context * ctx,struct ib_path_rec_data * path_data,size_t optlen)858 static int ucma_set_ib_path(struct ucma_context *ctx,
859 struct ib_path_rec_data *path_data, size_t optlen)
860 {
861 struct ib_sa_path_rec sa_path;
862 struct rdma_cm_event event;
863 int ret;
864
865 if (optlen % sizeof(*path_data))
866 return -EINVAL;
867
868 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
869 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
870 IB_PATH_BIDIRECTIONAL))
871 break;
872 }
873
874 if (!optlen)
875 return -EINVAL;
876
877 ib_sa_unpack_path(path_data->path_rec, &sa_path);
878 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
879 if (ret)
880 return ret;
881
882 memset(&event, 0, sizeof event);
883 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
884 return ucma_event_handler(ctx->cm_id, &event);
885 }
886
ucma_set_option_ib(struct ucma_context * ctx,int optname,void * optval,size_t optlen)887 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
888 void *optval, size_t optlen)
889 {
890 int ret;
891
892 switch (optname) {
893 case RDMA_OPTION_IB_PATH:
894 ret = ucma_set_ib_path(ctx, optval, optlen);
895 break;
896 default:
897 ret = -ENOSYS;
898 }
899
900 return ret;
901 }
902
ucma_set_option_level(struct ucma_context * ctx,int level,int optname,void * optval,size_t optlen)903 static int ucma_set_option_level(struct ucma_context *ctx, int level,
904 int optname, void *optval, size_t optlen)
905 {
906 int ret;
907
908 switch (level) {
909 case RDMA_OPTION_ID:
910 ret = ucma_set_option_id(ctx, optname, optval, optlen);
911 break;
912 case RDMA_OPTION_IB:
913 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
914 break;
915 default:
916 ret = -ENOSYS;
917 }
918
919 return ret;
920 }
921
ucma_set_option(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)922 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
923 int in_len, int out_len)
924 {
925 struct rdma_ucm_set_option cmd;
926 struct ucma_context *ctx;
927 void *optval;
928 int ret;
929
930 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
931 return -EFAULT;
932
933 ctx = ucma_get_ctx(file, cmd.id);
934 if (IS_ERR(ctx))
935 return PTR_ERR(ctx);
936
937 optval = kmalloc(cmd.optlen, GFP_KERNEL);
938 if (!optval) {
939 ret = -ENOMEM;
940 goto out1;
941 }
942
943 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
944 cmd.optlen)) {
945 ret = -EFAULT;
946 goto out2;
947 }
948
949 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
950 cmd.optlen);
951 out2:
952 kfree(optval);
953 out1:
954 ucma_put_ctx(ctx);
955 return ret;
956 }
957
ucma_notify(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)958 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
959 int in_len, int out_len)
960 {
961 struct rdma_ucm_notify cmd;
962 struct ucma_context *ctx;
963 int ret;
964
965 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
966 return -EFAULT;
967
968 ctx = ucma_get_ctx(file, cmd.id);
969 if (IS_ERR(ctx))
970 return PTR_ERR(ctx);
971
972 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
973 ucma_put_ctx(ctx);
974 return ret;
975 }
976
ucma_join_multicast(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)977 static ssize_t ucma_join_multicast(struct ucma_file *file,
978 const char __user *inbuf,
979 int in_len, int out_len)
980 {
981 struct rdma_ucm_join_mcast cmd;
982 struct rdma_ucm_create_id_resp resp;
983 struct ucma_context *ctx;
984 struct ucma_multicast *mc;
985 int ret;
986
987 if (out_len < sizeof(resp))
988 return -ENOSPC;
989
990 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
991 return -EFAULT;
992
993 ctx = ucma_get_ctx(file, cmd.id);
994 if (IS_ERR(ctx))
995 return PTR_ERR(ctx);
996
997 mutex_lock(&file->mut);
998 mc = ucma_alloc_multicast(ctx);
999 if (!mc) {
1000 ret = -ENOMEM;
1001 goto err1;
1002 }
1003
1004 mc->uid = cmd.uid;
1005 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
1006 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1007 if (ret)
1008 goto err2;
1009
1010 resp.id = mc->id;
1011 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1012 &resp, sizeof(resp))) {
1013 ret = -EFAULT;
1014 goto err3;
1015 }
1016
1017 mutex_unlock(&file->mut);
1018 ucma_put_ctx(ctx);
1019 return 0;
1020
1021 err3:
1022 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1023 ucma_cleanup_mc_events(mc);
1024 err2:
1025 mutex_lock(&mut);
1026 idr_remove(&multicast_idr, mc->id);
1027 mutex_unlock(&mut);
1028 list_del(&mc->list);
1029 kfree(mc);
1030 err1:
1031 mutex_unlock(&file->mut);
1032 ucma_put_ctx(ctx);
1033 return ret;
1034 }
1035
ucma_leave_multicast(struct ucma_file * file,const char __user * inbuf,int in_len,int out_len)1036 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1037 const char __user *inbuf,
1038 int in_len, int out_len)
1039 {
1040 struct rdma_ucm_destroy_id cmd;
1041 struct rdma_ucm_destroy_id_resp resp;
1042 struct ucma_multicast *mc;
1043 int ret = 0;
1044
1045 if (out_len < sizeof(resp))
1046 return -ENOSPC;
1047
1048 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1049 return -EFAULT;
1050
1051 mutex_lock(&mut);
1052 mc = idr_find(&multicast_idr, cmd.id);
1053 if (!mc)
1054 mc = ERR_PTR(-ENOENT);
1055 else if (mc->ctx->file != file)
1056 mc = ERR_PTR(-EINVAL);
1057 else {
1058 idr_remove(&multicast_idr, mc->id);
1059 atomic_inc(&mc->ctx->ref);
1060 }
1061 mutex_unlock(&mut);
1062
1063 if (IS_ERR(mc)) {
1064 ret = PTR_ERR(mc);
1065 goto out;
1066 }
1067
1068 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1069 mutex_lock(&mc->ctx->file->mut);
1070 ucma_cleanup_mc_events(mc);
1071 list_del(&mc->list);
1072 mutex_unlock(&mc->ctx->file->mut);
1073
1074 ucma_put_ctx(mc->ctx);
1075 resp.events_reported = mc->events_reported;
1076 kfree(mc);
1077
1078 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1079 &resp, sizeof(resp)))
1080 ret = -EFAULT;
1081 out:
1082 return ret;
1083 }
1084
ucma_lock_files(struct ucma_file * file1,struct ucma_file * file2)1085 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1086 {
1087 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1088 if (file1 < file2) {
1089 mutex_lock(&file1->mut);
1090 mutex_lock(&file2->mut);
1091 } else {
1092 mutex_lock(&file2->mut);
1093 mutex_lock(&file1->mut);
1094 }
1095 }
1096
ucma_unlock_files(struct ucma_file * file1,struct ucma_file * file2)1097 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1098 {
1099 if (file1 < file2) {
1100 mutex_unlock(&file2->mut);
1101 mutex_unlock(&file1->mut);
1102 } else {
1103 mutex_unlock(&file1->mut);
1104 mutex_unlock(&file2->mut);
1105 }
1106 }
1107
ucma_move_events(struct ucma_context * ctx,struct ucma_file * file)1108 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1109 {
1110 struct ucma_event *uevent, *tmp;
1111
1112 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1113 if (uevent->ctx == ctx)
1114 list_move_tail(&uevent->list, &file->event_list);
1115 }
1116
ucma_migrate_id(struct ucma_file * new_file,const char __user * inbuf,int in_len,int out_len)1117 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1118 const char __user *inbuf,
1119 int in_len, int out_len)
1120 {
1121 struct rdma_ucm_migrate_id cmd;
1122 struct rdma_ucm_migrate_resp resp;
1123 struct ucma_context *ctx;
1124 struct file *filp;
1125 struct ucma_file *cur_file;
1126 int ret = 0;
1127
1128 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1129 return -EFAULT;
1130
1131 /* Get current fd to protect against it being closed */
1132 filp = fget(cmd.fd);
1133 if (!filp)
1134 return -ENOENT;
1135
1136 /* Validate current fd and prevent destruction of id. */
1137 ctx = ucma_get_ctx(filp->private_data, cmd.id);
1138 if (IS_ERR(ctx)) {
1139 ret = PTR_ERR(ctx);
1140 goto file_put;
1141 }
1142
1143 cur_file = ctx->file;
1144 if (cur_file == new_file) {
1145 resp.events_reported = ctx->events_reported;
1146 goto response;
1147 }
1148
1149 /*
1150 * Migrate events between fd's, maintaining order, and avoiding new
1151 * events being added before existing events.
1152 */
1153 ucma_lock_files(cur_file, new_file);
1154 mutex_lock(&mut);
1155
1156 list_move_tail(&ctx->list, &new_file->ctx_list);
1157 ucma_move_events(ctx, new_file);
1158 ctx->file = new_file;
1159 resp.events_reported = ctx->events_reported;
1160
1161 mutex_unlock(&mut);
1162 ucma_unlock_files(cur_file, new_file);
1163
1164 response:
1165 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1166 &resp, sizeof(resp)))
1167 ret = -EFAULT;
1168
1169 ucma_put_ctx(ctx);
1170 file_put:
1171 fput(filp);
1172 return ret;
1173 }
1174
1175 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1176 const char __user *inbuf,
1177 int in_len, int out_len) = {
1178 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1179 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1180 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
1181 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1182 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1183 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1184 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1185 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1186 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1187 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1188 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1189 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1190 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1191 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1192 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1193 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1194 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
1195 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1196 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
1197 };
1198
ucma_write(struct file * filp,const char __user * buf,size_t len,loff_t * pos)1199 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1200 size_t len, loff_t *pos)
1201 {
1202 struct ucma_file *file = filp->private_data;
1203 struct rdma_ucm_cmd_hdr hdr;
1204 ssize_t ret;
1205
1206 if (len < sizeof(hdr))
1207 return -EINVAL;
1208
1209 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1210 return -EFAULT;
1211
1212 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1213 return -EINVAL;
1214
1215 if (hdr.in + sizeof(hdr) > len)
1216 return -EINVAL;
1217
1218 if (!ucma_cmd_table[hdr.cmd])
1219 return -ENOSYS;
1220
1221 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1222 if (!ret)
1223 ret = len;
1224
1225 return ret;
1226 }
1227
ucma_poll(struct file * filp,struct poll_table_struct * wait)1228 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1229 {
1230 struct ucma_file *file = filp->private_data;
1231 unsigned int mask = 0;
1232
1233 poll_wait(filp, &file->poll_wait, wait);
1234
1235 if (!list_empty(&file->event_list))
1236 mask = POLLIN | POLLRDNORM;
1237
1238 return mask;
1239 }
1240
1241 /*
1242 * ucma_open() does not need the BKL:
1243 *
1244 * - no global state is referred to;
1245 * - there is no ioctl method to race against;
1246 * - no further module initialization is required for open to work
1247 * after the device is registered.
1248 */
ucma_open(struct inode * inode,struct file * filp)1249 static int ucma_open(struct inode *inode, struct file *filp)
1250 {
1251 struct ucma_file *file;
1252
1253 file = kmalloc(sizeof *file, GFP_KERNEL);
1254 if (!file)
1255 return -ENOMEM;
1256
1257 INIT_LIST_HEAD(&file->event_list);
1258 INIT_LIST_HEAD(&file->ctx_list);
1259 init_waitqueue_head(&file->poll_wait);
1260 mutex_init(&file->mut);
1261
1262 filp->private_data = file;
1263 file->filp = filp;
1264 return 0;
1265 }
1266
ucma_close(struct inode * inode,struct file * filp)1267 static int ucma_close(struct inode *inode, struct file *filp)
1268 {
1269 struct ucma_file *file = filp->private_data;
1270 struct ucma_context *ctx, *tmp;
1271
1272 mutex_lock(&file->mut);
1273 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1274 mutex_unlock(&file->mut);
1275
1276 mutex_lock(&mut);
1277 idr_remove(&ctx_idr, ctx->id);
1278 mutex_unlock(&mut);
1279
1280 ucma_free_ctx(ctx);
1281 mutex_lock(&file->mut);
1282 }
1283 mutex_unlock(&file->mut);
1284 kfree(file);
1285 return 0;
1286 }
1287
1288 static const struct file_operations ucma_fops = {
1289 .owner = THIS_MODULE,
1290 .open = ucma_open,
1291 .release = ucma_close,
1292 .write = ucma_write,
1293 .poll = ucma_poll,
1294 };
1295
1296 static struct miscdevice ucma_misc = {
1297 .minor = MISC_DYNAMIC_MINOR,
1298 .name = "rdma_cm",
1299 .fops = &ucma_fops,
1300 };
1301
show_abi_version(struct device * dev,struct device_attribute * attr,char * buf)1302 static ssize_t show_abi_version(struct device *dev,
1303 struct device_attribute *attr,
1304 char *buf)
1305 {
1306 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1307 }
1308 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1309
ucma_init(void)1310 static int __init ucma_init(void)
1311 {
1312 int ret;
1313
1314 ret = misc_register(&ucma_misc);
1315 if (ret)
1316 return ret;
1317
1318 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1319 if (ret) {
1320 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1321 goto err;
1322 }
1323 return 0;
1324 err:
1325 misc_deregister(&ucma_misc);
1326 return ret;
1327 }
1328
ucma_cleanup(void)1329 static void __exit ucma_cleanup(void)
1330 {
1331 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1332 misc_deregister(&ucma_misc);
1333 idr_destroy(&ctx_idr);
1334 }
1335
1336 module_init(ucma_init);
1337 module_exit(ucma_cleanup);
1338