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Merge branch 'drm-rockchip-next-fixes-2016-03-28' of https://github.com/markyzq/kerne...
[deliverable/linux.git] / drivers / infiniband / core / ucm.c
1 /*
2 * Copyright (c) 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <linux/completion.h>
35 #include <linux/init.h>
36 #include <linux/fs.h>
37 #include <linux/module.h>
38 #include <linux/device.h>
39 #include <linux/err.h>
40 #include <linux/poll.h>
41 #include <linux/sched.h>
42 #include <linux/file.h>
43 #include <linux/mount.h>
44 #include <linux/cdev.h>
45 #include <linux/idr.h>
46 #include <linux/mutex.h>
47 #include <linux/slab.h>
48
49 #include <asm/uaccess.h>
50
51 #include <rdma/ib_cm.h>
52 #include <rdma/ib_user_cm.h>
53 #include <rdma/ib_marshall.h>
54
55 MODULE_AUTHOR("Libor Michalek");
56 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
57 MODULE_LICENSE("Dual BSD/GPL");
58
59 struct ib_ucm_device {
60 int devnum;
61 struct cdev cdev;
62 struct device dev;
63 struct ib_device *ib_dev;
64 };
65
66 struct ib_ucm_file {
67 struct mutex file_mutex;
68 struct file *filp;
69 struct ib_ucm_device *device;
70
71 struct list_head ctxs;
72 struct list_head events;
73 wait_queue_head_t poll_wait;
74 };
75
76 struct ib_ucm_context {
77 int id;
78 struct completion comp;
79 atomic_t ref;
80 int events_reported;
81
82 struct ib_ucm_file *file;
83 struct ib_cm_id *cm_id;
84 __u64 uid;
85
86 struct list_head events; /* list of pending events. */
87 struct list_head file_list; /* member in file ctx list */
88 };
89
90 struct ib_ucm_event {
91 struct ib_ucm_context *ctx;
92 struct list_head file_list; /* member in file event list */
93 struct list_head ctx_list; /* member in ctx event list */
94
95 struct ib_cm_id *cm_id;
96 struct ib_ucm_event_resp resp;
97 void *data;
98 void *info;
99 int data_len;
100 int info_len;
101 };
102
103 enum {
104 IB_UCM_MAJOR = 231,
105 IB_UCM_BASE_MINOR = 224,
106 IB_UCM_MAX_DEVICES = 32
107 };
108
109 #define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
110
111 static void ib_ucm_add_one(struct ib_device *device);
112 static void ib_ucm_remove_one(struct ib_device *device, void *client_data);
113
114 static struct ib_client ucm_client = {
115 .name = "ucm",
116 .add = ib_ucm_add_one,
117 .remove = ib_ucm_remove_one
118 };
119
120 static DEFINE_MUTEX(ctx_id_mutex);
121 static DEFINE_IDR(ctx_id_table);
122 static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
123
124 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
125 {
126 struct ib_ucm_context *ctx;
127
128 mutex_lock(&ctx_id_mutex);
129 ctx = idr_find(&ctx_id_table, id);
130 if (!ctx)
131 ctx = ERR_PTR(-ENOENT);
132 else if (ctx->file != file)
133 ctx = ERR_PTR(-EINVAL);
134 else
135 atomic_inc(&ctx->ref);
136 mutex_unlock(&ctx_id_mutex);
137
138 return ctx;
139 }
140
141 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
142 {
143 if (atomic_dec_and_test(&ctx->ref))
144 complete(&ctx->comp);
145 }
146
147 static inline int ib_ucm_new_cm_id(int event)
148 {
149 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
150 }
151
152 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
153 {
154 struct ib_ucm_event *uevent;
155
156 mutex_lock(&ctx->file->file_mutex);
157 list_del(&ctx->file_list);
158 while (!list_empty(&ctx->events)) {
159
160 uevent = list_entry(ctx->events.next,
161 struct ib_ucm_event, ctx_list);
162 list_del(&uevent->file_list);
163 list_del(&uevent->ctx_list);
164 mutex_unlock(&ctx->file->file_mutex);
165
166 /* clear incoming connections. */
167 if (ib_ucm_new_cm_id(uevent->resp.event))
168 ib_destroy_cm_id(uevent->cm_id);
169
170 kfree(uevent);
171 mutex_lock(&ctx->file->file_mutex);
172 }
173 mutex_unlock(&ctx->file->file_mutex);
174 }
175
176 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
177 {
178 struct ib_ucm_context *ctx;
179
180 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
181 if (!ctx)
182 return NULL;
183
184 atomic_set(&ctx->ref, 1);
185 init_completion(&ctx->comp);
186 ctx->file = file;
187 INIT_LIST_HEAD(&ctx->events);
188
189 mutex_lock(&ctx_id_mutex);
190 ctx->id = idr_alloc(&ctx_id_table, ctx, 0, 0, GFP_KERNEL);
191 mutex_unlock(&ctx_id_mutex);
192 if (ctx->id < 0)
193 goto error;
194
195 list_add_tail(&ctx->file_list, &file->ctxs);
196 return ctx;
197
198 error:
199 kfree(ctx);
200 return NULL;
201 }
202
203 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
204 struct ib_cm_req_event_param *kreq)
205 {
206 ureq->remote_ca_guid = kreq->remote_ca_guid;
207 ureq->remote_qkey = kreq->remote_qkey;
208 ureq->remote_qpn = kreq->remote_qpn;
209 ureq->qp_type = kreq->qp_type;
210 ureq->starting_psn = kreq->starting_psn;
211 ureq->responder_resources = kreq->responder_resources;
212 ureq->initiator_depth = kreq->initiator_depth;
213 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
214 ureq->flow_control = kreq->flow_control;
215 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
216 ureq->retry_count = kreq->retry_count;
217 ureq->rnr_retry_count = kreq->rnr_retry_count;
218 ureq->srq = kreq->srq;
219 ureq->port = kreq->port;
220
221 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
222 if (kreq->alternate_path)
223 ib_copy_path_rec_to_user(&ureq->alternate_path,
224 kreq->alternate_path);
225 }
226
227 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
228 struct ib_cm_rep_event_param *krep)
229 {
230 urep->remote_ca_guid = krep->remote_ca_guid;
231 urep->remote_qkey = krep->remote_qkey;
232 urep->remote_qpn = krep->remote_qpn;
233 urep->starting_psn = krep->starting_psn;
234 urep->responder_resources = krep->responder_resources;
235 urep->initiator_depth = krep->initiator_depth;
236 urep->target_ack_delay = krep->target_ack_delay;
237 urep->failover_accepted = krep->failover_accepted;
238 urep->flow_control = krep->flow_control;
239 urep->rnr_retry_count = krep->rnr_retry_count;
240 urep->srq = krep->srq;
241 }
242
243 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
244 struct ib_cm_sidr_rep_event_param *krep)
245 {
246 urep->status = krep->status;
247 urep->qkey = krep->qkey;
248 urep->qpn = krep->qpn;
249 };
250
251 static int ib_ucm_event_process(struct ib_cm_event *evt,
252 struct ib_ucm_event *uvt)
253 {
254 void *info = NULL;
255
256 switch (evt->event) {
257 case IB_CM_REQ_RECEIVED:
258 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
259 &evt->param.req_rcvd);
260 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
261 uvt->resp.present = IB_UCM_PRES_PRIMARY;
262 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
263 IB_UCM_PRES_ALTERNATE : 0);
264 break;
265 case IB_CM_REP_RECEIVED:
266 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
267 &evt->param.rep_rcvd);
268 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
269 break;
270 case IB_CM_RTU_RECEIVED:
271 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
272 uvt->resp.u.send_status = evt->param.send_status;
273 break;
274 case IB_CM_DREQ_RECEIVED:
275 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
276 uvt->resp.u.send_status = evt->param.send_status;
277 break;
278 case IB_CM_DREP_RECEIVED:
279 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
280 uvt->resp.u.send_status = evt->param.send_status;
281 break;
282 case IB_CM_MRA_RECEIVED:
283 uvt->resp.u.mra_resp.timeout =
284 evt->param.mra_rcvd.service_timeout;
285 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
286 break;
287 case IB_CM_REJ_RECEIVED:
288 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
289 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
290 uvt->info_len = evt->param.rej_rcvd.ari_length;
291 info = evt->param.rej_rcvd.ari;
292 break;
293 case IB_CM_LAP_RECEIVED:
294 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
295 evt->param.lap_rcvd.alternate_path);
296 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
297 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
298 break;
299 case IB_CM_APR_RECEIVED:
300 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
301 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
302 uvt->info_len = evt->param.apr_rcvd.info_len;
303 info = evt->param.apr_rcvd.apr_info;
304 break;
305 case IB_CM_SIDR_REQ_RECEIVED:
306 uvt->resp.u.sidr_req_resp.pkey =
307 evt->param.sidr_req_rcvd.pkey;
308 uvt->resp.u.sidr_req_resp.port =
309 evt->param.sidr_req_rcvd.port;
310 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
311 break;
312 case IB_CM_SIDR_REP_RECEIVED:
313 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
314 &evt->param.sidr_rep_rcvd);
315 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
316 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
317 info = evt->param.sidr_rep_rcvd.info;
318 break;
319 default:
320 uvt->resp.u.send_status = evt->param.send_status;
321 break;
322 }
323
324 if (uvt->data_len) {
325 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
326 if (!uvt->data)
327 goto err1;
328
329 uvt->resp.present |= IB_UCM_PRES_DATA;
330 }
331
332 if (uvt->info_len) {
333 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
334 if (!uvt->info)
335 goto err2;
336
337 uvt->resp.present |= IB_UCM_PRES_INFO;
338 }
339 return 0;
340
341 err2:
342 kfree(uvt->data);
343 err1:
344 return -ENOMEM;
345 }
346
347 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
348 struct ib_cm_event *event)
349 {
350 struct ib_ucm_event *uevent;
351 struct ib_ucm_context *ctx;
352 int result = 0;
353
354 ctx = cm_id->context;
355
356 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
357 if (!uevent)
358 goto err1;
359
360 uevent->ctx = ctx;
361 uevent->cm_id = cm_id;
362 uevent->resp.uid = ctx->uid;
363 uevent->resp.id = ctx->id;
364 uevent->resp.event = event->event;
365
366 result = ib_ucm_event_process(event, uevent);
367 if (result)
368 goto err2;
369
370 mutex_lock(&ctx->file->file_mutex);
371 list_add_tail(&uevent->file_list, &ctx->file->events);
372 list_add_tail(&uevent->ctx_list, &ctx->events);
373 wake_up_interruptible(&ctx->file->poll_wait);
374 mutex_unlock(&ctx->file->file_mutex);
375 return 0;
376
377 err2:
378 kfree(uevent);
379 err1:
380 /* Destroy new cm_id's */
381 return ib_ucm_new_cm_id(event->event);
382 }
383
384 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
385 const char __user *inbuf,
386 int in_len, int out_len)
387 {
388 struct ib_ucm_context *ctx;
389 struct ib_ucm_event_get cmd;
390 struct ib_ucm_event *uevent;
391 int result = 0;
392
393 if (out_len < sizeof(struct ib_ucm_event_resp))
394 return -ENOSPC;
395
396 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
397 return -EFAULT;
398
399 mutex_lock(&file->file_mutex);
400 while (list_empty(&file->events)) {
401 mutex_unlock(&file->file_mutex);
402
403 if (file->filp->f_flags & O_NONBLOCK)
404 return -EAGAIN;
405
406 if (wait_event_interruptible(file->poll_wait,
407 !list_empty(&file->events)))
408 return -ERESTARTSYS;
409
410 mutex_lock(&file->file_mutex);
411 }
412
413 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
414
415 if (ib_ucm_new_cm_id(uevent->resp.event)) {
416 ctx = ib_ucm_ctx_alloc(file);
417 if (!ctx) {
418 result = -ENOMEM;
419 goto done;
420 }
421
422 ctx->cm_id = uevent->cm_id;
423 ctx->cm_id->context = ctx;
424 uevent->resp.id = ctx->id;
425 }
426
427 if (copy_to_user((void __user *)(unsigned long)cmd.response,
428 &uevent->resp, sizeof(uevent->resp))) {
429 result = -EFAULT;
430 goto done;
431 }
432
433 if (uevent->data) {
434 if (cmd.data_len < uevent->data_len) {
435 result = -ENOMEM;
436 goto done;
437 }
438 if (copy_to_user((void __user *)(unsigned long)cmd.data,
439 uevent->data, uevent->data_len)) {
440 result = -EFAULT;
441 goto done;
442 }
443 }
444
445 if (uevent->info) {
446 if (cmd.info_len < uevent->info_len) {
447 result = -ENOMEM;
448 goto done;
449 }
450 if (copy_to_user((void __user *)(unsigned long)cmd.info,
451 uevent->info, uevent->info_len)) {
452 result = -EFAULT;
453 goto done;
454 }
455 }
456
457 list_del(&uevent->file_list);
458 list_del(&uevent->ctx_list);
459 uevent->ctx->events_reported++;
460
461 kfree(uevent->data);
462 kfree(uevent->info);
463 kfree(uevent);
464 done:
465 mutex_unlock(&file->file_mutex);
466 return result;
467 }
468
469 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
470 const char __user *inbuf,
471 int in_len, int out_len)
472 {
473 struct ib_ucm_create_id cmd;
474 struct ib_ucm_create_id_resp resp;
475 struct ib_ucm_context *ctx;
476 int result;
477
478 if (out_len < sizeof(resp))
479 return -ENOSPC;
480
481 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
482 return -EFAULT;
483
484 mutex_lock(&file->file_mutex);
485 ctx = ib_ucm_ctx_alloc(file);
486 mutex_unlock(&file->file_mutex);
487 if (!ctx)
488 return -ENOMEM;
489
490 ctx->uid = cmd.uid;
491 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
492 ib_ucm_event_handler, ctx);
493 if (IS_ERR(ctx->cm_id)) {
494 result = PTR_ERR(ctx->cm_id);
495 goto err1;
496 }
497
498 resp.id = ctx->id;
499 if (copy_to_user((void __user *)(unsigned long)cmd.response,
500 &resp, sizeof(resp))) {
501 result = -EFAULT;
502 goto err2;
503 }
504 return 0;
505
506 err2:
507 ib_destroy_cm_id(ctx->cm_id);
508 err1:
509 mutex_lock(&ctx_id_mutex);
510 idr_remove(&ctx_id_table, ctx->id);
511 mutex_unlock(&ctx_id_mutex);
512 kfree(ctx);
513 return result;
514 }
515
516 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
517 const char __user *inbuf,
518 int in_len, int out_len)
519 {
520 struct ib_ucm_destroy_id cmd;
521 struct ib_ucm_destroy_id_resp resp;
522 struct ib_ucm_context *ctx;
523 int result = 0;
524
525 if (out_len < sizeof(resp))
526 return -ENOSPC;
527
528 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
529 return -EFAULT;
530
531 mutex_lock(&ctx_id_mutex);
532 ctx = idr_find(&ctx_id_table, cmd.id);
533 if (!ctx)
534 ctx = ERR_PTR(-ENOENT);
535 else if (ctx->file != file)
536 ctx = ERR_PTR(-EINVAL);
537 else
538 idr_remove(&ctx_id_table, ctx->id);
539 mutex_unlock(&ctx_id_mutex);
540
541 if (IS_ERR(ctx))
542 return PTR_ERR(ctx);
543
544 ib_ucm_ctx_put(ctx);
545 wait_for_completion(&ctx->comp);
546
547 /* No new events will be generated after destroying the cm_id. */
548 ib_destroy_cm_id(ctx->cm_id);
549 /* Cleanup events not yet reported to the user. */
550 ib_ucm_cleanup_events(ctx);
551
552 resp.events_reported = ctx->events_reported;
553 if (copy_to_user((void __user *)(unsigned long)cmd.response,
554 &resp, sizeof(resp)))
555 result = -EFAULT;
556
557 kfree(ctx);
558 return result;
559 }
560
561 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
562 const char __user *inbuf,
563 int in_len, int out_len)
564 {
565 struct ib_ucm_attr_id_resp resp;
566 struct ib_ucm_attr_id cmd;
567 struct ib_ucm_context *ctx;
568 int result = 0;
569
570 if (out_len < sizeof(resp))
571 return -ENOSPC;
572
573 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
574 return -EFAULT;
575
576 ctx = ib_ucm_ctx_get(file, cmd.id);
577 if (IS_ERR(ctx))
578 return PTR_ERR(ctx);
579
580 resp.service_id = ctx->cm_id->service_id;
581 resp.service_mask = ctx->cm_id->service_mask;
582 resp.local_id = ctx->cm_id->local_id;
583 resp.remote_id = ctx->cm_id->remote_id;
584
585 if (copy_to_user((void __user *)(unsigned long)cmd.response,
586 &resp, sizeof(resp)))
587 result = -EFAULT;
588
589 ib_ucm_ctx_put(ctx);
590 return result;
591 }
592
593 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
594 const char __user *inbuf,
595 int in_len, int out_len)
596 {
597 struct ib_uverbs_qp_attr resp;
598 struct ib_ucm_init_qp_attr cmd;
599 struct ib_ucm_context *ctx;
600 struct ib_qp_attr qp_attr;
601 int result = 0;
602
603 if (out_len < sizeof(resp))
604 return -ENOSPC;
605
606 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
607 return -EFAULT;
608
609 ctx = ib_ucm_ctx_get(file, cmd.id);
610 if (IS_ERR(ctx))
611 return PTR_ERR(ctx);
612
613 resp.qp_attr_mask = 0;
614 memset(&qp_attr, 0, sizeof qp_attr);
615 qp_attr.qp_state = cmd.qp_state;
616 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
617 if (result)
618 goto out;
619
620 ib_copy_qp_attr_to_user(&resp, &qp_attr);
621
622 if (copy_to_user((void __user *)(unsigned long)cmd.response,
623 &resp, sizeof(resp)))
624 result = -EFAULT;
625
626 out:
627 ib_ucm_ctx_put(ctx);
628 return result;
629 }
630
631 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
632 {
633 service_id &= service_mask;
634
635 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
636 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
637 return -EINVAL;
638
639 return 0;
640 }
641
642 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
643 const char __user *inbuf,
644 int in_len, int out_len)
645 {
646 struct ib_ucm_listen cmd;
647 struct ib_ucm_context *ctx;
648 int result;
649
650 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
651 return -EFAULT;
652
653 ctx = ib_ucm_ctx_get(file, cmd.id);
654 if (IS_ERR(ctx))
655 return PTR_ERR(ctx);
656
657 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
658 if (result)
659 goto out;
660
661 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask);
662 out:
663 ib_ucm_ctx_put(ctx);
664 return result;
665 }
666
667 static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
668 const char __user *inbuf,
669 int in_len, int out_len)
670 {
671 struct ib_ucm_notify cmd;
672 struct ib_ucm_context *ctx;
673 int result;
674
675 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
676 return -EFAULT;
677
678 ctx = ib_ucm_ctx_get(file, cmd.id);
679 if (IS_ERR(ctx))
680 return PTR_ERR(ctx);
681
682 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
683 ib_ucm_ctx_put(ctx);
684 return result;
685 }
686
687 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
688 {
689 void *data;
690
691 *dest = NULL;
692
693 if (!len)
694 return 0;
695
696 data = memdup_user((void __user *)(unsigned long)src, len);
697 if (IS_ERR(data))
698 return PTR_ERR(data);
699
700 *dest = data;
701 return 0;
702 }
703
704 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
705 {
706 struct ib_user_path_rec upath;
707 struct ib_sa_path_rec *sa_path;
708
709 *path = NULL;
710
711 if (!src)
712 return 0;
713
714 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
715 if (!sa_path)
716 return -ENOMEM;
717
718 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
719 sizeof(upath))) {
720
721 kfree(sa_path);
722 return -EFAULT;
723 }
724
725 ib_copy_path_rec_from_user(sa_path, &upath);
726 *path = sa_path;
727 return 0;
728 }
729
730 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
731 const char __user *inbuf,
732 int in_len, int out_len)
733 {
734 struct ib_cm_req_param param;
735 struct ib_ucm_context *ctx;
736 struct ib_ucm_req cmd;
737 int result;
738
739 param.private_data = NULL;
740 param.primary_path = NULL;
741 param.alternate_path = NULL;
742
743 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
744 return -EFAULT;
745
746 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
747 if (result)
748 goto done;
749
750 result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
751 if (result)
752 goto done;
753
754 result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
755 if (result)
756 goto done;
757
758 param.private_data_len = cmd.len;
759 param.service_id = cmd.sid;
760 param.qp_num = cmd.qpn;
761 param.qp_type = cmd.qp_type;
762 param.starting_psn = cmd.psn;
763 param.peer_to_peer = cmd.peer_to_peer;
764 param.responder_resources = cmd.responder_resources;
765 param.initiator_depth = cmd.initiator_depth;
766 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
767 param.flow_control = cmd.flow_control;
768 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
769 param.retry_count = cmd.retry_count;
770 param.rnr_retry_count = cmd.rnr_retry_count;
771 param.max_cm_retries = cmd.max_cm_retries;
772 param.srq = cmd.srq;
773
774 ctx = ib_ucm_ctx_get(file, cmd.id);
775 if (!IS_ERR(ctx)) {
776 result = ib_send_cm_req(ctx->cm_id, &param);
777 ib_ucm_ctx_put(ctx);
778 } else
779 result = PTR_ERR(ctx);
780
781 done:
782 kfree(param.private_data);
783 kfree(param.primary_path);
784 kfree(param.alternate_path);
785 return result;
786 }
787
788 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
789 const char __user *inbuf,
790 int in_len, int out_len)
791 {
792 struct ib_cm_rep_param param;
793 struct ib_ucm_context *ctx;
794 struct ib_ucm_rep cmd;
795 int result;
796
797 param.private_data = NULL;
798
799 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
800 return -EFAULT;
801
802 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
803 if (result)
804 return result;
805
806 param.qp_num = cmd.qpn;
807 param.starting_psn = cmd.psn;
808 param.private_data_len = cmd.len;
809 param.responder_resources = cmd.responder_resources;
810 param.initiator_depth = cmd.initiator_depth;
811 param.failover_accepted = cmd.failover_accepted;
812 param.flow_control = cmd.flow_control;
813 param.rnr_retry_count = cmd.rnr_retry_count;
814 param.srq = cmd.srq;
815
816 ctx = ib_ucm_ctx_get(file, cmd.id);
817 if (!IS_ERR(ctx)) {
818 ctx->uid = cmd.uid;
819 result = ib_send_cm_rep(ctx->cm_id, &param);
820 ib_ucm_ctx_put(ctx);
821 } else
822 result = PTR_ERR(ctx);
823
824 kfree(param.private_data);
825 return result;
826 }
827
828 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
829 const char __user *inbuf, int in_len,
830 int (*func)(struct ib_cm_id *cm_id,
831 const void *private_data,
832 u8 private_data_len))
833 {
834 struct ib_ucm_private_data cmd;
835 struct ib_ucm_context *ctx;
836 const void *private_data = NULL;
837 int result;
838
839 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
840 return -EFAULT;
841
842 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
843 if (result)
844 return result;
845
846 ctx = ib_ucm_ctx_get(file, cmd.id);
847 if (!IS_ERR(ctx)) {
848 result = func(ctx->cm_id, private_data, cmd.len);
849 ib_ucm_ctx_put(ctx);
850 } else
851 result = PTR_ERR(ctx);
852
853 kfree(private_data);
854 return result;
855 }
856
857 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
858 const char __user *inbuf,
859 int in_len, int out_len)
860 {
861 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
862 }
863
864 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
865 const char __user *inbuf,
866 int in_len, int out_len)
867 {
868 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
869 }
870
871 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
872 const char __user *inbuf,
873 int in_len, int out_len)
874 {
875 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
876 }
877
878 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
879 const char __user *inbuf, int in_len,
880 int (*func)(struct ib_cm_id *cm_id,
881 int status,
882 const void *info,
883 u8 info_len,
884 const void *data,
885 u8 data_len))
886 {
887 struct ib_ucm_context *ctx;
888 struct ib_ucm_info cmd;
889 const void *data = NULL;
890 const void *info = NULL;
891 int result;
892
893 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
894 return -EFAULT;
895
896 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
897 if (result)
898 goto done;
899
900 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
901 if (result)
902 goto done;
903
904 ctx = ib_ucm_ctx_get(file, cmd.id);
905 if (!IS_ERR(ctx)) {
906 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
907 data, cmd.data_len);
908 ib_ucm_ctx_put(ctx);
909 } else
910 result = PTR_ERR(ctx);
911
912 done:
913 kfree(data);
914 kfree(info);
915 return result;
916 }
917
918 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
919 const char __user *inbuf,
920 int in_len, int out_len)
921 {
922 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
923 }
924
925 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
926 const char __user *inbuf,
927 int in_len, int out_len)
928 {
929 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
930 }
931
932 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
933 const char __user *inbuf,
934 int in_len, int out_len)
935 {
936 struct ib_ucm_context *ctx;
937 struct ib_ucm_mra cmd;
938 const void *data = NULL;
939 int result;
940
941 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
942 return -EFAULT;
943
944 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
945 if (result)
946 return result;
947
948 ctx = ib_ucm_ctx_get(file, cmd.id);
949 if (!IS_ERR(ctx)) {
950 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
951 ib_ucm_ctx_put(ctx);
952 } else
953 result = PTR_ERR(ctx);
954
955 kfree(data);
956 return result;
957 }
958
959 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
960 const char __user *inbuf,
961 int in_len, int out_len)
962 {
963 struct ib_ucm_context *ctx;
964 struct ib_sa_path_rec *path = NULL;
965 struct ib_ucm_lap cmd;
966 const void *data = NULL;
967 int result;
968
969 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
970 return -EFAULT;
971
972 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
973 if (result)
974 goto done;
975
976 result = ib_ucm_path_get(&path, cmd.path);
977 if (result)
978 goto done;
979
980 ctx = ib_ucm_ctx_get(file, cmd.id);
981 if (!IS_ERR(ctx)) {
982 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
983 ib_ucm_ctx_put(ctx);
984 } else
985 result = PTR_ERR(ctx);
986
987 done:
988 kfree(data);
989 kfree(path);
990 return result;
991 }
992
993 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
994 const char __user *inbuf,
995 int in_len, int out_len)
996 {
997 struct ib_cm_sidr_req_param param;
998 struct ib_ucm_context *ctx;
999 struct ib_ucm_sidr_req cmd;
1000 int result;
1001
1002 param.private_data = NULL;
1003 param.path = NULL;
1004
1005 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1006 return -EFAULT;
1007
1008 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1009 if (result)
1010 goto done;
1011
1012 result = ib_ucm_path_get(&param.path, cmd.path);
1013 if (result)
1014 goto done;
1015
1016 param.private_data_len = cmd.len;
1017 param.service_id = cmd.sid;
1018 param.timeout_ms = cmd.timeout;
1019 param.max_cm_retries = cmd.max_cm_retries;
1020
1021 ctx = ib_ucm_ctx_get(file, cmd.id);
1022 if (!IS_ERR(ctx)) {
1023 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1024 ib_ucm_ctx_put(ctx);
1025 } else
1026 result = PTR_ERR(ctx);
1027
1028 done:
1029 kfree(param.private_data);
1030 kfree(param.path);
1031 return result;
1032 }
1033
1034 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1035 const char __user *inbuf,
1036 int in_len, int out_len)
1037 {
1038 struct ib_cm_sidr_rep_param param;
1039 struct ib_ucm_sidr_rep cmd;
1040 struct ib_ucm_context *ctx;
1041 int result;
1042
1043 param.info = NULL;
1044
1045 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1046 return -EFAULT;
1047
1048 result = ib_ucm_alloc_data(&param.private_data,
1049 cmd.data, cmd.data_len);
1050 if (result)
1051 goto done;
1052
1053 result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1054 if (result)
1055 goto done;
1056
1057 param.qp_num = cmd.qpn;
1058 param.qkey = cmd.qkey;
1059 param.status = cmd.status;
1060 param.info_length = cmd.info_len;
1061 param.private_data_len = cmd.data_len;
1062
1063 ctx = ib_ucm_ctx_get(file, cmd.id);
1064 if (!IS_ERR(ctx)) {
1065 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1066 ib_ucm_ctx_put(ctx);
1067 } else
1068 result = PTR_ERR(ctx);
1069
1070 done:
1071 kfree(param.private_data);
1072 kfree(param.info);
1073 return result;
1074 }
1075
1076 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1077 const char __user *inbuf,
1078 int in_len, int out_len) = {
1079 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1080 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1081 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1082 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1083 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1084 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1085 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1086 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1087 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1088 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1089 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1090 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1091 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1092 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1093 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1094 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1095 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1096 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1097 };
1098
1099 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1100 size_t len, loff_t *pos)
1101 {
1102 struct ib_ucm_file *file = filp->private_data;
1103 struct ib_ucm_cmd_hdr hdr;
1104 ssize_t result;
1105
1106 if (len < sizeof(hdr))
1107 return -EINVAL;
1108
1109 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1110 return -EFAULT;
1111
1112 if (hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1113 return -EINVAL;
1114
1115 if (hdr.in + sizeof(hdr) > len)
1116 return -EINVAL;
1117
1118 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1119 hdr.in, hdr.out);
1120 if (!result)
1121 result = len;
1122
1123 return result;
1124 }
1125
1126 static unsigned int ib_ucm_poll(struct file *filp,
1127 struct poll_table_struct *wait)
1128 {
1129 struct ib_ucm_file *file = filp->private_data;
1130 unsigned int mask = 0;
1131
1132 poll_wait(filp, &file->poll_wait, wait);
1133
1134 if (!list_empty(&file->events))
1135 mask = POLLIN | POLLRDNORM;
1136
1137 return mask;
1138 }
1139
1140 /*
1141 * ib_ucm_open() does not need the BKL:
1142 *
1143 * - no global state is referred to;
1144 * - there is no ioctl method to race against;
1145 * - no further module initialization is required for open to work
1146 * after the device is registered.
1147 */
1148 static int ib_ucm_open(struct inode *inode, struct file *filp)
1149 {
1150 struct ib_ucm_file *file;
1151
1152 file = kmalloc(sizeof(*file), GFP_KERNEL);
1153 if (!file)
1154 return -ENOMEM;
1155
1156 INIT_LIST_HEAD(&file->events);
1157 INIT_LIST_HEAD(&file->ctxs);
1158 init_waitqueue_head(&file->poll_wait);
1159
1160 mutex_init(&file->file_mutex);
1161
1162 filp->private_data = file;
1163 file->filp = filp;
1164 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1165
1166 return nonseekable_open(inode, filp);
1167 }
1168
1169 static int ib_ucm_close(struct inode *inode, struct file *filp)
1170 {
1171 struct ib_ucm_file *file = filp->private_data;
1172 struct ib_ucm_context *ctx;
1173
1174 mutex_lock(&file->file_mutex);
1175 while (!list_empty(&file->ctxs)) {
1176 ctx = list_entry(file->ctxs.next,
1177 struct ib_ucm_context, file_list);
1178 mutex_unlock(&file->file_mutex);
1179
1180 mutex_lock(&ctx_id_mutex);
1181 idr_remove(&ctx_id_table, ctx->id);
1182 mutex_unlock(&ctx_id_mutex);
1183
1184 ib_destroy_cm_id(ctx->cm_id);
1185 ib_ucm_cleanup_events(ctx);
1186 kfree(ctx);
1187
1188 mutex_lock(&file->file_mutex);
1189 }
1190 mutex_unlock(&file->file_mutex);
1191 kfree(file);
1192 return 0;
1193 }
1194
1195 static DECLARE_BITMAP(overflow_map, IB_UCM_MAX_DEVICES);
1196 static void ib_ucm_release_dev(struct device *dev)
1197 {
1198 struct ib_ucm_device *ucm_dev;
1199
1200 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1201 cdev_del(&ucm_dev->cdev);
1202 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1203 clear_bit(ucm_dev->devnum, dev_map);
1204 else
1205 clear_bit(ucm_dev->devnum - IB_UCM_MAX_DEVICES, overflow_map);
1206 kfree(ucm_dev);
1207 }
1208
1209 static const struct file_operations ucm_fops = {
1210 .owner = THIS_MODULE,
1211 .open = ib_ucm_open,
1212 .release = ib_ucm_close,
1213 .write = ib_ucm_write,
1214 .poll = ib_ucm_poll,
1215 .llseek = no_llseek,
1216 };
1217
1218 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1219 char *buf)
1220 {
1221 struct ib_ucm_device *ucm_dev;
1222
1223 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1224 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1225 }
1226 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1227
1228 static dev_t overflow_maj;
1229 static int find_overflow_devnum(void)
1230 {
1231 int ret;
1232
1233 if (!overflow_maj) {
1234 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UCM_MAX_DEVICES,
1235 "infiniband_cm");
1236 if (ret) {
1237 pr_err("ucm: couldn't register dynamic device number\n");
1238 return ret;
1239 }
1240 }
1241
1242 ret = find_first_zero_bit(overflow_map, IB_UCM_MAX_DEVICES);
1243 if (ret >= IB_UCM_MAX_DEVICES)
1244 return -1;
1245
1246 return ret;
1247 }
1248
1249 static void ib_ucm_add_one(struct ib_device *device)
1250 {
1251 int devnum;
1252 dev_t base;
1253 struct ib_ucm_device *ucm_dev;
1254
1255 if (!device->alloc_ucontext || !rdma_cap_ib_cm(device, 1))
1256 return;
1257
1258 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1259 if (!ucm_dev)
1260 return;
1261
1262 ucm_dev->ib_dev = device;
1263
1264 devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1265 if (devnum >= IB_UCM_MAX_DEVICES) {
1266 devnum = find_overflow_devnum();
1267 if (devnum < 0)
1268 goto err;
1269
1270 ucm_dev->devnum = devnum + IB_UCM_MAX_DEVICES;
1271 base = devnum + overflow_maj;
1272 set_bit(devnum, overflow_map);
1273 } else {
1274 ucm_dev->devnum = devnum;
1275 base = devnum + IB_UCM_BASE_DEV;
1276 set_bit(devnum, dev_map);
1277 }
1278
1279 cdev_init(&ucm_dev->cdev, &ucm_fops);
1280 ucm_dev->cdev.owner = THIS_MODULE;
1281 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1282 if (cdev_add(&ucm_dev->cdev, base, 1))
1283 goto err;
1284
1285 ucm_dev->dev.class = &cm_class;
1286 ucm_dev->dev.parent = device->dma_device;
1287 ucm_dev->dev.devt = ucm_dev->cdev.dev;
1288 ucm_dev->dev.release = ib_ucm_release_dev;
1289 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1290 if (device_register(&ucm_dev->dev))
1291 goto err_cdev;
1292
1293 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1294 goto err_dev;
1295
1296 ib_set_client_data(device, &ucm_client, ucm_dev);
1297 return;
1298
1299 err_dev:
1300 device_unregister(&ucm_dev->dev);
1301 err_cdev:
1302 cdev_del(&ucm_dev->cdev);
1303 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1304 clear_bit(devnum, dev_map);
1305 else
1306 clear_bit(devnum, overflow_map);
1307 err:
1308 kfree(ucm_dev);
1309 return;
1310 }
1311
1312 static void ib_ucm_remove_one(struct ib_device *device, void *client_data)
1313 {
1314 struct ib_ucm_device *ucm_dev = client_data;
1315
1316 if (!ucm_dev)
1317 return;
1318
1319 device_unregister(&ucm_dev->dev);
1320 }
1321
1322 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1323 __stringify(IB_USER_CM_ABI_VERSION));
1324
1325 static int __init ib_ucm_init(void)
1326 {
1327 int ret;
1328
1329 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1330 "infiniband_cm");
1331 if (ret) {
1332 pr_err("ucm: couldn't register device number\n");
1333 goto error1;
1334 }
1335
1336 ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
1337 if (ret) {
1338 pr_err("ucm: couldn't create abi_version attribute\n");
1339 goto error2;
1340 }
1341
1342 ret = ib_register_client(&ucm_client);
1343 if (ret) {
1344 pr_err("ucm: couldn't register client\n");
1345 goto error3;
1346 }
1347 return 0;
1348
1349 error3:
1350 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1351 error2:
1352 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1353 error1:
1354 return ret;
1355 }
1356
1357 static void __exit ib_ucm_cleanup(void)
1358 {
1359 ib_unregister_client(&ucm_client);
1360 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1361 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1362 if (overflow_maj)
1363 unregister_chrdev_region(overflow_maj, IB_UCM_MAX_DEVICES);
1364 idr_destroy(&ctx_id_table);
1365 }
1366
1367 module_init(ib_ucm_init);
1368 module_exit(ib_ucm_cleanup);
Linux kernel - Deliverables
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