?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / infiniband / core / ucm.c
blob01702265c1e1a5175f05499c66f1ebe046a06e21
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 <linux/uaccess.h>
50
51 #include <rdma/ib.h>
52 #include <rdma/ib_cm.h>
53 #include <rdma/ib_user_cm.h>
54 #include <rdma/ib_marshall.h>
55
56 #include "core_priv.h"
57
58 MODULE_AUTHOR("Libor Michalek");
59 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
60 MODULE_LICENSE("Dual BSD/GPL");
61
62 struct ib_ucm_device {
63 int devnum;
64 struct cdev cdev;
65 struct device dev;
66 struct ib_device *ib_dev;
67 };
68
69 struct ib_ucm_file {
70 struct mutex file_mutex;
71 struct file *filp;
72 struct ib_ucm_device *device;
73
74 struct list_head ctxs;
75 struct list_head events;
76 wait_queue_head_t poll_wait;
77 };
78
79 struct ib_ucm_context {
80 int id;
81 struct completion comp;
82 atomic_t ref;
83 int events_reported;
84
85 struct ib_ucm_file *file;
86 struct ib_cm_id *cm_id;
87 __u64 uid;
88
89 struct list_head events; /* list of pending events. */
90 struct list_head file_list; /* member in file ctx list */
91 };
92
93 struct ib_ucm_event {
94 struct ib_ucm_context *ctx;
95 struct list_head file_list; /* member in file event list */
96 struct list_head ctx_list; /* member in ctx event list */
97
98 struct ib_cm_id *cm_id;
99 struct ib_ucm_event_resp resp;
100 void *data;
101 void *info;
102 int data_len;
103 int info_len;
104 };
105
106 enum {
107 IB_UCM_MAJOR = 231,
108 IB_UCM_BASE_MINOR = 224,
109 IB_UCM_MAX_DEVICES = RDMA_MAX_PORTS,
110 IB_UCM_NUM_FIXED_MINOR = 32,
111 IB_UCM_NUM_DYNAMIC_MINOR = IB_UCM_MAX_DEVICES - IB_UCM_NUM_FIXED_MINOR,
112 };
113
114 #define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
115 static dev_t dynamic_ucm_dev;
116
117 static void ib_ucm_add_one(struct ib_device *device);
118 static void ib_ucm_remove_one(struct ib_device *device, void *client_data);
119
120 static struct ib_client ucm_client = {
121 .name = "ucm",
122 .add = ib_ucm_add_one,
123 .remove = ib_ucm_remove_one
124 };
125
126 static DEFINE_MUTEX(ctx_id_mutex);
127 static DEFINE_IDR(ctx_id_table);
128 static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
129
130 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
131 {
132 struct ib_ucm_context *ctx;
133
134 mutex_lock(&ctx_id_mutex);
135 ctx = idr_find(&ctx_id_table, id);
136 if (!ctx)
137 ctx = ERR_PTR(-ENOENT);
138 else if (ctx->file != file)
139 ctx = ERR_PTR(-EINVAL);
140 else
141 atomic_inc(&ctx->ref);
142 mutex_unlock(&ctx_id_mutex);
143
144 return ctx;
145 }
146
147 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
148 {
149 if (atomic_dec_and_test(&ctx->ref))
150 complete(&ctx->comp);
151 }
152
153 static inline int ib_ucm_new_cm_id(int event)
154 {
155 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
156 }
157
158 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
159 {
160 struct ib_ucm_event *uevent;
161
162 mutex_lock(&ctx->file->file_mutex);
163 list_del(&ctx->file_list);
164 while (!list_empty(&ctx->events)) {
165
166 uevent = list_entry(ctx->events.next,
167 struct ib_ucm_event, ctx_list);
168 list_del(&uevent->file_list);
169 list_del(&uevent->ctx_list);
170 mutex_unlock(&ctx->file->file_mutex);
171
172 /* clear incoming connections. */
173 if (ib_ucm_new_cm_id(uevent->resp.event))
174 ib_destroy_cm_id(uevent->cm_id);
175
176 kfree(uevent);
177 mutex_lock(&ctx->file->file_mutex);
178 }
179 mutex_unlock(&ctx->file->file_mutex);
180 }
181
182 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
183 {
184 struct ib_ucm_context *ctx;
185
186 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
187 if (!ctx)
188 return NULL;
189
190 atomic_set(&ctx->ref, 1);
191 init_completion(&ctx->comp);
192 ctx->file = file;
193 INIT_LIST_HEAD(&ctx->events);
194
195 mutex_lock(&ctx_id_mutex);
196 ctx->id = idr_alloc(&ctx_id_table, ctx, 0, 0, GFP_KERNEL);
197 mutex_unlock(&ctx_id_mutex);
198 if (ctx->id < 0)
199 goto error;
200
201 list_add_tail(&ctx->file_list, &file->ctxs);
202 return ctx;
203
204 error:
205 kfree(ctx);
206 return NULL;
207 }
208
209 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
210 struct ib_cm_req_event_param *kreq)
211 {
212 ureq->remote_ca_guid = kreq->remote_ca_guid;
213 ureq->remote_qkey = kreq->remote_qkey;
214 ureq->remote_qpn = kreq->remote_qpn;
215 ureq->qp_type = kreq->qp_type;
216 ureq->starting_psn = kreq->starting_psn;
217 ureq->responder_resources = kreq->responder_resources;
218 ureq->initiator_depth = kreq->initiator_depth;
219 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
220 ureq->flow_control = kreq->flow_control;
221 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
222 ureq->retry_count = kreq->retry_count;
223 ureq->rnr_retry_count = kreq->rnr_retry_count;
224 ureq->srq = kreq->srq;
225 ureq->port = kreq->port;
226
227 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
228 if (kreq->alternate_path)
229 ib_copy_path_rec_to_user(&ureq->alternate_path,
230 kreq->alternate_path);
231 }
232
233 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
234 struct ib_cm_rep_event_param *krep)
235 {
236 urep->remote_ca_guid = krep->remote_ca_guid;
237 urep->remote_qkey = krep->remote_qkey;
238 urep->remote_qpn = krep->remote_qpn;
239 urep->starting_psn = krep->starting_psn;
240 urep->responder_resources = krep->responder_resources;
241 urep->initiator_depth = krep->initiator_depth;
242 urep->target_ack_delay = krep->target_ack_delay;
243 urep->failover_accepted = krep->failover_accepted;
244 urep->flow_control = krep->flow_control;
245 urep->rnr_retry_count = krep->rnr_retry_count;
246 urep->srq = krep->srq;
247 }
248
249 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
250 struct ib_cm_sidr_rep_event_param *krep)
251 {
252 urep->status = krep->status;
253 urep->qkey = krep->qkey;
254 urep->qpn = krep->qpn;
255 };
256
257 static int ib_ucm_event_process(struct ib_cm_event *evt,
258 struct ib_ucm_event *uvt)
259 {
260 void *info = NULL;
261
262 switch (evt->event) {
263 case IB_CM_REQ_RECEIVED:
264 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
265 &evt->param.req_rcvd);
266 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
267 uvt->resp.present = IB_UCM_PRES_PRIMARY;
268 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
269 IB_UCM_PRES_ALTERNATE : 0);
270 break;
271 case IB_CM_REP_RECEIVED:
272 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
273 &evt->param.rep_rcvd);
274 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
275 break;
276 case IB_CM_RTU_RECEIVED:
277 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
278 uvt->resp.u.send_status = evt->param.send_status;
279 break;
280 case IB_CM_DREQ_RECEIVED:
281 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
282 uvt->resp.u.send_status = evt->param.send_status;
283 break;
284 case IB_CM_DREP_RECEIVED:
285 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
286 uvt->resp.u.send_status = evt->param.send_status;
287 break;
288 case IB_CM_MRA_RECEIVED:
289 uvt->resp.u.mra_resp.timeout =
290 evt->param.mra_rcvd.service_timeout;
291 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
292 break;
293 case IB_CM_REJ_RECEIVED:
294 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
295 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
296 uvt->info_len = evt->param.rej_rcvd.ari_length;
297 info = evt->param.rej_rcvd.ari;
298 break;
299 case IB_CM_LAP_RECEIVED:
300 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
301 evt->param.lap_rcvd.alternate_path);
302 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
303 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
304 break;
305 case IB_CM_APR_RECEIVED:
306 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
307 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
308 uvt->info_len = evt->param.apr_rcvd.info_len;
309 info = evt->param.apr_rcvd.apr_info;
310 break;
311 case IB_CM_SIDR_REQ_RECEIVED:
312 uvt->resp.u.sidr_req_resp.pkey =
313 evt->param.sidr_req_rcvd.pkey;
314 uvt->resp.u.sidr_req_resp.port =
315 evt->param.sidr_req_rcvd.port;
316 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
317 break;
318 case IB_CM_SIDR_REP_RECEIVED:
319 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
320 &evt->param.sidr_rep_rcvd);
321 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
322 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
323 info = evt->param.sidr_rep_rcvd.info;
324 break;
325 default:
326 uvt->resp.u.send_status = evt->param.send_status;
327 break;
328 }
329
330 if (uvt->data_len) {
331 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
332 if (!uvt->data)
333 goto err1;
334
335 uvt->resp.present |= IB_UCM_PRES_DATA;
336 }
337
338 if (uvt->info_len) {
339 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
340 if (!uvt->info)
341 goto err2;
342
343 uvt->resp.present |= IB_UCM_PRES_INFO;
344 }
345 return 0;
346
347 err2:
348 kfree(uvt->data);
349 err1:
350 return -ENOMEM;
351 }
352
353 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
354 struct ib_cm_event *event)
355 {
356 struct ib_ucm_event *uevent;
357 struct ib_ucm_context *ctx;
358 int result = 0;
359
360 ctx = cm_id->context;
361
362 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
363 if (!uevent)
364 goto err1;
365
366 uevent->ctx = ctx;
367 uevent->cm_id = cm_id;
368 uevent->resp.uid = ctx->uid;
369 uevent->resp.id = ctx->id;
370 uevent->resp.event = event->event;
371
372 result = ib_ucm_event_process(event, uevent);
373 if (result)
374 goto err2;
375
376 mutex_lock(&ctx->file->file_mutex);
377 list_add_tail(&uevent->file_list, &ctx->file->events);
378 list_add_tail(&uevent->ctx_list, &ctx->events);
379 wake_up_interruptible(&ctx->file->poll_wait);
380 mutex_unlock(&ctx->file->file_mutex);
381 return 0;
382
383 err2:
384 kfree(uevent);
385 err1:
386 /* Destroy new cm_id's */
387 return ib_ucm_new_cm_id(event->event);
388 }
389
390 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
391 const char __user *inbuf,
392 int in_len, int out_len)
393 {
394 struct ib_ucm_context *ctx;
395 struct ib_ucm_event_get cmd;
396 struct ib_ucm_event *uevent;
397 int result = 0;
398
399 if (out_len < sizeof(struct ib_ucm_event_resp))
400 return -ENOSPC;
401
402 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
403 return -EFAULT;
404
405 mutex_lock(&file->file_mutex);
406 while (list_empty(&file->events)) {
407 mutex_unlock(&file->file_mutex);
408
409 if (file->filp->f_flags & O_NONBLOCK)
410 return -EAGAIN;
411
412 if (wait_event_interruptible(file->poll_wait,
413 !list_empty(&file->events)))
414 return -ERESTARTSYS;
415
416 mutex_lock(&file->file_mutex);
417 }
418
419 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
420
421 if (ib_ucm_new_cm_id(uevent->resp.event)) {
422 ctx = ib_ucm_ctx_alloc(file);
423 if (!ctx) {
424 result = -ENOMEM;
425 goto done;
426 }
427
428 ctx->cm_id = uevent->cm_id;
429 ctx->cm_id->context = ctx;
430 uevent->resp.id = ctx->id;
431 }
432
433 if (copy_to_user((void __user *)(unsigned long)cmd.response,
434 &uevent->resp, sizeof(uevent->resp))) {
435 result = -EFAULT;
436 goto done;
437 }
438
439 if (uevent->data) {
440 if (cmd.data_len < uevent->data_len) {
441 result = -ENOMEM;
442 goto done;
443 }
444 if (copy_to_user((void __user *)(unsigned long)cmd.data,
445 uevent->data, uevent->data_len)) {
446 result = -EFAULT;
447 goto done;
448 }
449 }
450
451 if (uevent->info) {
452 if (cmd.info_len < uevent->info_len) {
453 result = -ENOMEM;
454 goto done;
455 }
456 if (copy_to_user((void __user *)(unsigned long)cmd.info,
457 uevent->info, uevent->info_len)) {
458 result = -EFAULT;
459 goto done;
460 }
461 }
462
463 list_del(&uevent->file_list);
464 list_del(&uevent->ctx_list);
465 uevent->ctx->events_reported++;
466
467 kfree(uevent->data);
468 kfree(uevent->info);
469 kfree(uevent);
470 done:
471 mutex_unlock(&file->file_mutex);
472 return result;
473 }
474
475 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
476 const char __user *inbuf,
477 int in_len, int out_len)
478 {
479 struct ib_ucm_create_id cmd;
480 struct ib_ucm_create_id_resp resp;
481 struct ib_ucm_context *ctx;
482 int result;
483
484 if (out_len < sizeof(resp))
485 return -ENOSPC;
486
487 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
488 return -EFAULT;
489
490 mutex_lock(&file->file_mutex);
491 ctx = ib_ucm_ctx_alloc(file);
492 mutex_unlock(&file->file_mutex);
493 if (!ctx)
494 return -ENOMEM;
495
496 ctx->uid = cmd.uid;
497 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
498 ib_ucm_event_handler, ctx);
499 if (IS_ERR(ctx->cm_id)) {
500 result = PTR_ERR(ctx->cm_id);
501 goto err1;
502 }
503
504 resp.id = ctx->id;
505 if (copy_to_user((void __user *)(unsigned long)cmd.response,
506 &resp, sizeof(resp))) {
507 result = -EFAULT;
508 goto err2;
509 }
510 return 0;
511
512 err2:
513 ib_destroy_cm_id(ctx->cm_id);
514 err1:
515 mutex_lock(&ctx_id_mutex);
516 idr_remove(&ctx_id_table, ctx->id);
517 mutex_unlock(&ctx_id_mutex);
518 kfree(ctx);
519 return result;
520 }
521
522 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
523 const char __user *inbuf,
524 int in_len, int out_len)
525 {
526 struct ib_ucm_destroy_id cmd;
527 struct ib_ucm_destroy_id_resp resp;
528 struct ib_ucm_context *ctx;
529 int result = 0;
530
531 if (out_len < sizeof(resp))
532 return -ENOSPC;
533
534 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
535 return -EFAULT;
536
537 mutex_lock(&ctx_id_mutex);
538 ctx = idr_find(&ctx_id_table, cmd.id);
539 if (!ctx)
540 ctx = ERR_PTR(-ENOENT);
541 else if (ctx->file != file)
542 ctx = ERR_PTR(-EINVAL);
543 else
544 idr_remove(&ctx_id_table, ctx->id);
545 mutex_unlock(&ctx_id_mutex);
546
547 if (IS_ERR(ctx))
548 return PTR_ERR(ctx);
549
550 ib_ucm_ctx_put(ctx);
551 wait_for_completion(&ctx->comp);
552
553 /* No new events will be generated after destroying the cm_id. */
554 ib_destroy_cm_id(ctx->cm_id);
555 /* Cleanup events not yet reported to the user. */
556 ib_ucm_cleanup_events(ctx);
557
558 resp.events_reported = ctx->events_reported;
559 if (copy_to_user((void __user *)(unsigned long)cmd.response,
560 &resp, sizeof(resp)))
561 result = -EFAULT;
562
563 kfree(ctx);
564 return result;
565 }
566
567 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
568 const char __user *inbuf,
569 int in_len, int out_len)
570 {
571 struct ib_ucm_attr_id_resp resp;
572 struct ib_ucm_attr_id cmd;
573 struct ib_ucm_context *ctx;
574 int result = 0;
575
576 if (out_len < sizeof(resp))
577 return -ENOSPC;
578
579 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
580 return -EFAULT;
581
582 ctx = ib_ucm_ctx_get(file, cmd.id);
583 if (IS_ERR(ctx))
584 return PTR_ERR(ctx);
585
586 resp.service_id = ctx->cm_id->service_id;
587 resp.service_mask = ctx->cm_id->service_mask;
588 resp.local_id = ctx->cm_id->local_id;
589 resp.remote_id = ctx->cm_id->remote_id;
590
591 if (copy_to_user((void __user *)(unsigned long)cmd.response,
592 &resp, sizeof(resp)))
593 result = -EFAULT;
594
595 ib_ucm_ctx_put(ctx);
596 return result;
597 }
598
599 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
600 const char __user *inbuf,
601 int in_len, int out_len)
602 {
603 struct ib_uverbs_qp_attr resp;
604 struct ib_ucm_init_qp_attr cmd;
605 struct ib_ucm_context *ctx;
606 struct ib_qp_attr qp_attr;
607 int result = 0;
608
609 if (out_len < sizeof(resp))
610 return -ENOSPC;
611
612 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
613 return -EFAULT;
614
615 ctx = ib_ucm_ctx_get(file, cmd.id);
616 if (IS_ERR(ctx))
617 return PTR_ERR(ctx);
618
619 resp.qp_attr_mask = 0;
620 memset(&qp_attr, 0, sizeof qp_attr);
621 qp_attr.qp_state = cmd.qp_state;
622 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
623 if (result)
624 goto out;
625
626 ib_copy_qp_attr_to_user(ctx->cm_id->device, &resp, &qp_attr);
627
628 if (copy_to_user((void __user *)(unsigned long)cmd.response,
629 &resp, sizeof(resp)))
630 result = -EFAULT;
631
632 out:
633 ib_ucm_ctx_put(ctx);
634 return result;
635 }
636
637 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
638 {
639 service_id &= service_mask;
640
641 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
642 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
643 return -EINVAL;
644
645 return 0;
646 }
647
648 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
649 const char __user *inbuf,
650 int in_len, int out_len)
651 {
652 struct ib_ucm_listen cmd;
653 struct ib_ucm_context *ctx;
654 int result;
655
656 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
657 return -EFAULT;
658
659 ctx = ib_ucm_ctx_get(file, cmd.id);
660 if (IS_ERR(ctx))
661 return PTR_ERR(ctx);
662
663 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
664 if (result)
665 goto out;
666
667 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask);
668 out:
669 ib_ucm_ctx_put(ctx);
670 return result;
671 }
672
673 static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
674 const char __user *inbuf,
675 int in_len, int out_len)
676 {
677 struct ib_ucm_notify cmd;
678 struct ib_ucm_context *ctx;
679 int result;
680
681 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
682 return -EFAULT;
683
684 ctx = ib_ucm_ctx_get(file, cmd.id);
685 if (IS_ERR(ctx))
686 return PTR_ERR(ctx);
687
688 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
689 ib_ucm_ctx_put(ctx);
690 return result;
691 }
692
693 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
694 {
695 void *data;
696
697 *dest = NULL;
698
699 if (!len)
700 return 0;
701
702 data = memdup_user((void __user *)(unsigned long)src, len);
703 if (IS_ERR(data))
704 return PTR_ERR(data);
705
706 *dest = data;
707 return 0;
708 }
709
710 static int ib_ucm_path_get(struct sa_path_rec **path, u64 src)
711 {
712 struct ib_user_path_rec upath;
713 struct sa_path_rec *sa_path;
714
715 *path = NULL;
716
717 if (!src)
718 return 0;
719
720 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
721 if (!sa_path)
722 return -ENOMEM;
723
724 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
725 sizeof(upath))) {
726
727 kfree(sa_path);
728 return -EFAULT;
729 }
730
731 ib_copy_path_rec_from_user(sa_path, &upath);
732 *path = sa_path;
733 return 0;
734 }
735
736 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
737 const char __user *inbuf,
738 int in_len, int out_len)
739 {
740 struct ib_cm_req_param param;
741 struct ib_ucm_context *ctx;
742 struct ib_ucm_req cmd;
743 int result;
744
745 param.private_data = NULL;
746 param.primary_path = NULL;
747 param.alternate_path = NULL;
748
749 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
750 return -EFAULT;
751
752 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
753 if (result)
754 goto done;
755
756 result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
757 if (result)
758 goto done;
759
760 result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
761 if (result)
762 goto done;
763
764 param.private_data_len = cmd.len;
765 param.service_id = cmd.sid;
766 param.qp_num = cmd.qpn;
767 param.qp_type = cmd.qp_type;
768 param.starting_psn = cmd.psn;
769 param.peer_to_peer = cmd.peer_to_peer;
770 param.responder_resources = cmd.responder_resources;
771 param.initiator_depth = cmd.initiator_depth;
772 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
773 param.flow_control = cmd.flow_control;
774 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
775 param.retry_count = cmd.retry_count;
776 param.rnr_retry_count = cmd.rnr_retry_count;
777 param.max_cm_retries = cmd.max_cm_retries;
778 param.srq = cmd.srq;
779
780 ctx = ib_ucm_ctx_get(file, cmd.id);
781 if (!IS_ERR(ctx)) {
782 result = ib_send_cm_req(ctx->cm_id, &param);
783 ib_ucm_ctx_put(ctx);
784 } else
785 result = PTR_ERR(ctx);
786
787 done:
788 kfree(param.private_data);
789 kfree(param.primary_path);
790 kfree(param.alternate_path);
791 return result;
792 }
793
794 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
795 const char __user *inbuf,
796 int in_len, int out_len)
797 {
798 struct ib_cm_rep_param param;
799 struct ib_ucm_context *ctx;
800 struct ib_ucm_rep cmd;
801 int result;
802
803 param.private_data = NULL;
804
805 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
806 return -EFAULT;
807
808 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
809 if (result)
810 return result;
811
812 param.qp_num = cmd.qpn;
813 param.starting_psn = cmd.psn;
814 param.private_data_len = cmd.len;
815 param.responder_resources = cmd.responder_resources;
816 param.initiator_depth = cmd.initiator_depth;
817 param.failover_accepted = cmd.failover_accepted;
818 param.flow_control = cmd.flow_control;
819 param.rnr_retry_count = cmd.rnr_retry_count;
820 param.srq = cmd.srq;
821
822 ctx = ib_ucm_ctx_get(file, cmd.id);
823 if (!IS_ERR(ctx)) {
824 ctx->uid = cmd.uid;
825 result = ib_send_cm_rep(ctx->cm_id, &param);
826 ib_ucm_ctx_put(ctx);
827 } else
828 result = PTR_ERR(ctx);
829
830 kfree(param.private_data);
831 return result;
832 }
833
834 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
835 const char __user *inbuf, int in_len,
836 int (*func)(struct ib_cm_id *cm_id,
837 const void *private_data,
838 u8 private_data_len))
839 {
840 struct ib_ucm_private_data cmd;
841 struct ib_ucm_context *ctx;
842 const void *private_data = NULL;
843 int result;
844
845 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
846 return -EFAULT;
847
848 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
849 if (result)
850 return result;
851
852 ctx = ib_ucm_ctx_get(file, cmd.id);
853 if (!IS_ERR(ctx)) {
854 result = func(ctx->cm_id, private_data, cmd.len);
855 ib_ucm_ctx_put(ctx);
856 } else
857 result = PTR_ERR(ctx);
858
859 kfree(private_data);
860 return result;
861 }
862
863 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
864 const char __user *inbuf,
865 int in_len, int out_len)
866 {
867 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
868 }
869
870 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
871 const char __user *inbuf,
872 int in_len, int out_len)
873 {
874 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
875 }
876
877 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
878 const char __user *inbuf,
879 int in_len, int out_len)
880 {
881 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
882 }
883
884 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
885 const char __user *inbuf, int in_len,
886 int (*func)(struct ib_cm_id *cm_id,
887 int status,
888 const void *info,
889 u8 info_len,
890 const void *data,
891 u8 data_len))
892 {
893 struct ib_ucm_context *ctx;
894 struct ib_ucm_info cmd;
895 const void *data = NULL;
896 const void *info = NULL;
897 int result;
898
899 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
900 return -EFAULT;
901
902 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
903 if (result)
904 goto done;
905
906 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
907 if (result)
908 goto done;
909
910 ctx = ib_ucm_ctx_get(file, cmd.id);
911 if (!IS_ERR(ctx)) {
912 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
913 data, cmd.data_len);
914 ib_ucm_ctx_put(ctx);
915 } else
916 result = PTR_ERR(ctx);
917
918 done:
919 kfree(data);
920 kfree(info);
921 return result;
922 }
923
924 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
925 const char __user *inbuf,
926 int in_len, int out_len)
927 {
928 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
929 }
930
931 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
932 const char __user *inbuf,
933 int in_len, int out_len)
934 {
935 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
936 }
937
938 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
939 const char __user *inbuf,
940 int in_len, int out_len)
941 {
942 struct ib_ucm_context *ctx;
943 struct ib_ucm_mra cmd;
944 const void *data = NULL;
945 int result;
946
947 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
948 return -EFAULT;
949
950 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
951 if (result)
952 return result;
953
954 ctx = ib_ucm_ctx_get(file, cmd.id);
955 if (!IS_ERR(ctx)) {
956 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
957 ib_ucm_ctx_put(ctx);
958 } else
959 result = PTR_ERR(ctx);
960
961 kfree(data);
962 return result;
963 }
964
965 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
966 const char __user *inbuf,
967 int in_len, int out_len)
968 {
969 struct ib_ucm_context *ctx;
970 struct sa_path_rec *path = NULL;
971 struct ib_ucm_lap cmd;
972 const void *data = NULL;
973 int result;
974
975 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
976 return -EFAULT;
977
978 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
979 if (result)
980 goto done;
981
982 result = ib_ucm_path_get(&path, cmd.path);
983 if (result)
984 goto done;
985
986 ctx = ib_ucm_ctx_get(file, cmd.id);
987 if (!IS_ERR(ctx)) {
988 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
989 ib_ucm_ctx_put(ctx);
990 } else
991 result = PTR_ERR(ctx);
992
993 done:
994 kfree(data);
995 kfree(path);
996 return result;
997 }
998
999 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1000 const char __user *inbuf,
1001 int in_len, int out_len)
1002 {
1003 struct ib_cm_sidr_req_param param;
1004 struct ib_ucm_context *ctx;
1005 struct ib_ucm_sidr_req cmd;
1006 int result;
1007
1008 param.private_data = NULL;
1009 param.path = NULL;
1010
1011 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1012 return -EFAULT;
1013
1014 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1015 if (result)
1016 goto done;
1017
1018 result = ib_ucm_path_get(&param.path, cmd.path);
1019 if (result)
1020 goto done;
1021
1022 param.private_data_len = cmd.len;
1023 param.service_id = cmd.sid;
1024 param.timeout_ms = cmd.timeout;
1025 param.max_cm_retries = cmd.max_cm_retries;
1026
1027 ctx = ib_ucm_ctx_get(file, cmd.id);
1028 if (!IS_ERR(ctx)) {
1029 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1030 ib_ucm_ctx_put(ctx);
1031 } else
1032 result = PTR_ERR(ctx);
1033
1034 done:
1035 kfree(param.private_data);
1036 kfree(param.path);
1037 return result;
1038 }
1039
1040 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1041 const char __user *inbuf,
1042 int in_len, int out_len)
1043 {
1044 struct ib_cm_sidr_rep_param param;
1045 struct ib_ucm_sidr_rep cmd;
1046 struct ib_ucm_context *ctx;
1047 int result;
1048
1049 param.info = NULL;
1050
1051 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1052 return -EFAULT;
1053
1054 result = ib_ucm_alloc_data(&param.private_data,
1055 cmd.data, cmd.data_len);
1056 if (result)
1057 goto done;
1058
1059 result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1060 if (result)
1061 goto done;
1062
1063 param.qp_num = cmd.qpn;
1064 param.qkey = cmd.qkey;
1065 param.status = cmd.status;
1066 param.info_length = cmd.info_len;
1067 param.private_data_len = cmd.data_len;
1068
1069 ctx = ib_ucm_ctx_get(file, cmd.id);
1070 if (!IS_ERR(ctx)) {
1071 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1072 ib_ucm_ctx_put(ctx);
1073 } else
1074 result = PTR_ERR(ctx);
1075
1076 done:
1077 kfree(param.private_data);
1078 kfree(param.info);
1079 return result;
1080 }
1081
1082 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1083 const char __user *inbuf,
1084 int in_len, int out_len) = {
1085 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1086 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1087 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1088 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1089 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1090 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1091 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1092 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1093 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1094 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1095 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1096 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1097 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1098 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1099 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1100 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1101 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1102 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1103 };
1104
1105 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1106 size_t len, loff_t *pos)
1107 {
1108 struct ib_ucm_file *file = filp->private_data;
1109 struct ib_ucm_cmd_hdr hdr;
1110 ssize_t result;
1111
1112 if (!ib_safe_file_access(filp)) {
1113 pr_err_once("ucm_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
1114 task_tgid_vnr(current), current->comm);
1115 return -EACCES;
1116 }
1117
1118 if (len < sizeof(hdr))
1119 return -EINVAL;
1120
1121 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1122 return -EFAULT;
1123
1124 if (hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1125 return -EINVAL;
1126
1127 if (hdr.in + sizeof(hdr) > len)
1128 return -EINVAL;
1129
1130 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1131 hdr.in, hdr.out);
1132 if (!result)
1133 result = len;
1134
1135 return result;
1136 }
1137
1138 static __poll_t ib_ucm_poll(struct file *filp,
1139 struct poll_table_struct *wait)
1140 {
1141 struct ib_ucm_file *file = filp->private_data;
1142 __poll_t mask = 0;
1143
1144 poll_wait(filp, &file->poll_wait, wait);
1145
1146 if (!list_empty(&file->events))
1147 mask = EPOLLIN | EPOLLRDNORM;
1148
1149 return mask;
1150 }
1151
1152 /*
1153 * ib_ucm_open() does not need the BKL:
1154 *
1155 * - no global state is referred to;
1156 * - there is no ioctl method to race against;
1157 * - no further module initialization is required for open to work
1158 * after the device is registered.
1159 */
1160 static int ib_ucm_open(struct inode *inode, struct file *filp)
1161 {
1162 struct ib_ucm_file *file;
1163
1164 file = kmalloc(sizeof(*file), GFP_KERNEL);
1165 if (!file)
1166 return -ENOMEM;
1167
1168 INIT_LIST_HEAD(&file->events);
1169 INIT_LIST_HEAD(&file->ctxs);
1170 init_waitqueue_head(&file->poll_wait);
1171
1172 mutex_init(&file->file_mutex);
1173
1174 filp->private_data = file;
1175 file->filp = filp;
1176 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1177
1178 return nonseekable_open(inode, filp);
1179 }
1180
1181 static int ib_ucm_close(struct inode *inode, struct file *filp)
1182 {
1183 struct ib_ucm_file *file = filp->private_data;
1184 struct ib_ucm_context *ctx;
1185
1186 mutex_lock(&file->file_mutex);
1187 while (!list_empty(&file->ctxs)) {
1188 ctx = list_entry(file->ctxs.next,
1189 struct ib_ucm_context, file_list);
1190 mutex_unlock(&file->file_mutex);
1191
1192 mutex_lock(&ctx_id_mutex);
1193 idr_remove(&ctx_id_table, ctx->id);
1194 mutex_unlock(&ctx_id_mutex);
1195
1196 ib_destroy_cm_id(ctx->cm_id);
1197 ib_ucm_cleanup_events(ctx);
1198 kfree(ctx);
1199
1200 mutex_lock(&file->file_mutex);
1201 }
1202 mutex_unlock(&file->file_mutex);
1203 kfree(file);
1204 return 0;
1205 }
1206
1207 static void ib_ucm_release_dev(struct device *dev)
1208 {
1209 struct ib_ucm_device *ucm_dev;
1210
1211 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1212 kfree(ucm_dev);
1213 }
1214
1215 static void ib_ucm_free_dev(struct ib_ucm_device *ucm_dev)
1216 {
1217 clear_bit(ucm_dev->devnum, dev_map);
1218 }
1219
1220 static const struct file_operations ucm_fops = {
1221 .owner = THIS_MODULE,
1222 .open = ib_ucm_open,
1223 .release = ib_ucm_close,
1224 .write = ib_ucm_write,
1225 .poll = ib_ucm_poll,
1226 .llseek = no_llseek,
1227 };
1228
1229 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1230 char *buf)
1231 {
1232 struct ib_ucm_device *ucm_dev;
1233
1234 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1235 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1236 }
1237 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1238
1239 static void ib_ucm_add_one(struct ib_device *device)
1240 {
1241 int devnum;
1242 dev_t base;
1243 struct ib_ucm_device *ucm_dev;
1244
1245 if (!device->alloc_ucontext || !rdma_cap_ib_cm(device, 1))
1246 return;
1247
1248 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1249 if (!ucm_dev)
1250 return;
1251
1252 device_initialize(&ucm_dev->dev);
1253 ucm_dev->ib_dev = device;
1254 ucm_dev->dev.release = ib_ucm_release_dev;
1255
1256 devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1257 if (devnum >= IB_UCM_MAX_DEVICES)
1258 goto err;
1259 ucm_dev->devnum = devnum;
1260 set_bit(devnum, dev_map);
1261 if (devnum >= IB_UCM_NUM_FIXED_MINOR)
1262 base = dynamic_ucm_dev + devnum - IB_UCM_NUM_FIXED_MINOR;
1263 else
1264 base = IB_UCM_BASE_DEV + devnum;
1265
1266 cdev_init(&ucm_dev->cdev, &ucm_fops);
1267 ucm_dev->cdev.owner = THIS_MODULE;
1268 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1269
1270 ucm_dev->dev.class = &cm_class;
1271 ucm_dev->dev.parent = device->dev.parent;
1272 ucm_dev->dev.devt = base;
1273
1274 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1275 if (cdev_device_add(&ucm_dev->cdev, &ucm_dev->dev))
1276 goto err_devnum;
1277
1278 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1279 goto err_dev;
1280
1281 ib_set_client_data(device, &ucm_client, ucm_dev);
1282 return;
1283
1284 err_dev:
1285 cdev_device_del(&ucm_dev->cdev, &ucm_dev->dev);
1286 err_devnum:
1287 ib_ucm_free_dev(ucm_dev);
1288 err:
1289 put_device(&ucm_dev->dev);
1290 return;
1291 }
1292
1293 static void ib_ucm_remove_one(struct ib_device *device, void *client_data)
1294 {
1295 struct ib_ucm_device *ucm_dev = client_data;
1296
1297 if (!ucm_dev)
1298 return;
1299
1300 cdev_device_del(&ucm_dev->cdev, &ucm_dev->dev);
1301 ib_ucm_free_dev(ucm_dev);
1302 put_device(&ucm_dev->dev);
1303 }
1304
1305 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1306 __stringify(IB_USER_CM_ABI_VERSION));
1307
1308 static int __init ib_ucm_init(void)
1309 {
1310 int ret;
1311
1312 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_NUM_FIXED_MINOR,
1313 "infiniband_cm");
1314 if (ret) {
1315 pr_err("ucm: couldn't register device number\n");
1316 goto error1;
1317 }
1318
1319 ret = alloc_chrdev_region(&dynamic_ucm_dev, 0, IB_UCM_NUM_DYNAMIC_MINOR,
1320 "infiniband_cm");
1321 if (ret) {
1322 pr_err("ucm: couldn't register dynamic device number\n");
1323 goto err_alloc;
1324 }
1325
1326 ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
1327 if (ret) {
1328 pr_err("ucm: couldn't create abi_version attribute\n");
1329 goto error2;
1330 }
1331
1332 ret = ib_register_client(&ucm_client);
1333 if (ret) {
1334 pr_err("ucm: couldn't register client\n");
1335 goto error3;
1336 }
1337 return 0;
1338
1339 error3:
1340 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1341 error2:
1342 unregister_chrdev_region(dynamic_ucm_dev, IB_UCM_NUM_DYNAMIC_MINOR);
1343 err_alloc:
1344 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_NUM_FIXED_MINOR);
1345 error1:
1346 return ret;
1347 }
1348
1349 static void __exit ib_ucm_cleanup(void)
1350 {
1351 ib_unregister_client(&ucm_client);
1352 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1353 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_NUM_FIXED_MINOR);
1354 unregister_chrdev_region(dynamic_ucm_dev, IB_UCM_NUM_DYNAMIC_MINOR);
1355 idr_destroy(&ctx_id_table);
1356 }
1357
1358 module_init(ib_ucm_init);
1359 module_exit(ib_ucm_cleanup);
CRIS linux kernel tree