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spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / drivers / infiniband / core / ucm.c
blob06f08713f487c8b3aec1f4bfe85f9dc744b1f2c7
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);
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 int result;
180
181 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
182 if (!ctx)
183 return NULL;
184
185 atomic_set(&ctx->ref, 1);
186 init_completion(&ctx->comp);
187 ctx->file = file;
188 INIT_LIST_HEAD(&ctx->events);
189
190 do {
191 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
192 if (!result)
193 goto error;
194
195 mutex_lock(&ctx_id_mutex);
196 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
197 mutex_unlock(&ctx_id_mutex);
198 } while (result == -EAGAIN);
199
200 if (result)
201 goto error;
202
203 list_add_tail(&ctx->file_list, &file->ctxs);
204 return ctx;
205
206 error:
207 kfree(ctx);
208 return NULL;
209 }
210
211 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
212 struct ib_cm_req_event_param *kreq)
213 {
214 ureq->remote_ca_guid = kreq->remote_ca_guid;
215 ureq->remote_qkey = kreq->remote_qkey;
216 ureq->remote_qpn = kreq->remote_qpn;
217 ureq->qp_type = kreq->qp_type;
218 ureq->starting_psn = kreq->starting_psn;
219 ureq->responder_resources = kreq->responder_resources;
220 ureq->initiator_depth = kreq->initiator_depth;
221 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
222 ureq->flow_control = kreq->flow_control;
223 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
224 ureq->retry_count = kreq->retry_count;
225 ureq->rnr_retry_count = kreq->rnr_retry_count;
226 ureq->srq = kreq->srq;
227 ureq->port = kreq->port;
228
229 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
230 if (kreq->alternate_path)
231 ib_copy_path_rec_to_user(&ureq->alternate_path,
232 kreq->alternate_path);
233 }
234
235 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
236 struct ib_cm_rep_event_param *krep)
237 {
238 urep->remote_ca_guid = krep->remote_ca_guid;
239 urep->remote_qkey = krep->remote_qkey;
240 urep->remote_qpn = krep->remote_qpn;
241 urep->starting_psn = krep->starting_psn;
242 urep->responder_resources = krep->responder_resources;
243 urep->initiator_depth = krep->initiator_depth;
244 urep->target_ack_delay = krep->target_ack_delay;
245 urep->failover_accepted = krep->failover_accepted;
246 urep->flow_control = krep->flow_control;
247 urep->rnr_retry_count = krep->rnr_retry_count;
248 urep->srq = krep->srq;
249 }
250
251 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
252 struct ib_cm_sidr_rep_event_param *krep)
253 {
254 urep->status = krep->status;
255 urep->qkey = krep->qkey;
256 urep->qpn = krep->qpn;
257 };
258
259 static int ib_ucm_event_process(struct ib_cm_event *evt,
260 struct ib_ucm_event *uvt)
261 {
262 void *info = NULL;
263
264 switch (evt->event) {
265 case IB_CM_REQ_RECEIVED:
266 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
267 &evt->param.req_rcvd);
268 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
269 uvt->resp.present = IB_UCM_PRES_PRIMARY;
270 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
271 IB_UCM_PRES_ALTERNATE : 0);
272 break;
273 case IB_CM_REP_RECEIVED:
274 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
275 &evt->param.rep_rcvd);
276 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
277 break;
278 case IB_CM_RTU_RECEIVED:
279 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
280 uvt->resp.u.send_status = evt->param.send_status;
281 break;
282 case IB_CM_DREQ_RECEIVED:
283 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
284 uvt->resp.u.send_status = evt->param.send_status;
285 break;
286 case IB_CM_DREP_RECEIVED:
287 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
288 uvt->resp.u.send_status = evt->param.send_status;
289 break;
290 case IB_CM_MRA_RECEIVED:
291 uvt->resp.u.mra_resp.timeout =
292 evt->param.mra_rcvd.service_timeout;
293 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
294 break;
295 case IB_CM_REJ_RECEIVED:
296 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
297 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
298 uvt->info_len = evt->param.rej_rcvd.ari_length;
299 info = evt->param.rej_rcvd.ari;
300 break;
301 case IB_CM_LAP_RECEIVED:
302 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
303 evt->param.lap_rcvd.alternate_path);
304 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
305 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
306 break;
307 case IB_CM_APR_RECEIVED:
308 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
309 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
310 uvt->info_len = evt->param.apr_rcvd.info_len;
311 info = evt->param.apr_rcvd.apr_info;
312 break;
313 case IB_CM_SIDR_REQ_RECEIVED:
314 uvt->resp.u.sidr_req_resp.pkey =
315 evt->param.sidr_req_rcvd.pkey;
316 uvt->resp.u.sidr_req_resp.port =
317 evt->param.sidr_req_rcvd.port;
318 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
319 break;
320 case IB_CM_SIDR_REP_RECEIVED:
321 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
322 &evt->param.sidr_rep_rcvd);
323 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
324 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
325 info = evt->param.sidr_rep_rcvd.info;
326 break;
327 default:
328 uvt->resp.u.send_status = evt->param.send_status;
329 break;
330 }
331
332 if (uvt->data_len) {
333 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
334 if (!uvt->data)
335 goto err1;
336
337 uvt->resp.present |= IB_UCM_PRES_DATA;
338 }
339
340 if (uvt->info_len) {
341 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
342 if (!uvt->info)
343 goto err2;
344
345 uvt->resp.present |= IB_UCM_PRES_INFO;
346 }
347 return 0;
348
349 err2:
350 kfree(uvt->data);
351 err1:
352 return -ENOMEM;
353 }
354
355 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
356 struct ib_cm_event *event)
357 {
358 struct ib_ucm_event *uevent;
359 struct ib_ucm_context *ctx;
360 int result = 0;
361
362 ctx = cm_id->context;
363
364 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
365 if (!uevent)
366 goto err1;
367
368 uevent->ctx = ctx;
369 uevent->cm_id = cm_id;
370 uevent->resp.uid = ctx->uid;
371 uevent->resp.id = ctx->id;
372 uevent->resp.event = event->event;
373
374 result = ib_ucm_event_process(event, uevent);
375 if (result)
376 goto err2;
377
378 mutex_lock(&ctx->file->file_mutex);
379 list_add_tail(&uevent->file_list, &ctx->file->events);
380 list_add_tail(&uevent->ctx_list, &ctx->events);
381 wake_up_interruptible(&ctx->file->poll_wait);
382 mutex_unlock(&ctx->file->file_mutex);
383 return 0;
384
385 err2:
386 kfree(uevent);
387 err1:
388 /* Destroy new cm_id's */
389 return ib_ucm_new_cm_id(event->event);
390 }
391
392 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
393 const char __user *inbuf,
394 int in_len, int out_len)
395 {
396 struct ib_ucm_context *ctx;
397 struct ib_ucm_event_get cmd;
398 struct ib_ucm_event *uevent;
399 int result = 0;
400 DEFINE_WAIT(wait);
401
402 if (out_len < sizeof(struct ib_ucm_event_resp))
403 return -ENOSPC;
404
405 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
406 return -EFAULT;
407
408 mutex_lock(&file->file_mutex);
409 while (list_empty(&file->events)) {
410 mutex_unlock(&file->file_mutex);
411
412 if (file->filp->f_flags & O_NONBLOCK)
413 return -EAGAIN;
414
415 if (wait_event_interruptible(file->poll_wait,
416 !list_empty(&file->events)))
417 return -ERESTARTSYS;
418
419 mutex_lock(&file->file_mutex);
420 }
421
422 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
423
424 if (ib_ucm_new_cm_id(uevent->resp.event)) {
425 ctx = ib_ucm_ctx_alloc(file);
426 if (!ctx) {
427 result = -ENOMEM;
428 goto done;
429 }
430
431 ctx->cm_id = uevent->cm_id;
432 ctx->cm_id->context = ctx;
433 uevent->resp.id = ctx->id;
434 }
435
436 if (copy_to_user((void __user *)(unsigned long)cmd.response,
437 &uevent->resp, sizeof(uevent->resp))) {
438 result = -EFAULT;
439 goto done;
440 }
441
442 if (uevent->data) {
443 if (cmd.data_len < uevent->data_len) {
444 result = -ENOMEM;
445 goto done;
446 }
447 if (copy_to_user((void __user *)(unsigned long)cmd.data,
448 uevent->data, uevent->data_len)) {
449 result = -EFAULT;
450 goto done;
451 }
452 }
453
454 if (uevent->info) {
455 if (cmd.info_len < uevent->info_len) {
456 result = -ENOMEM;
457 goto done;
458 }
459 if (copy_to_user((void __user *)(unsigned long)cmd.info,
460 uevent->info, uevent->info_len)) {
461 result = -EFAULT;
462 goto done;
463 }
464 }
465
466 list_del(&uevent->file_list);
467 list_del(&uevent->ctx_list);
468 uevent->ctx->events_reported++;
469
470 kfree(uevent->data);
471 kfree(uevent->info);
472 kfree(uevent);
473 done:
474 mutex_unlock(&file->file_mutex);
475 return result;
476 }
477
478 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
479 const char __user *inbuf,
480 int in_len, int out_len)
481 {
482 struct ib_ucm_create_id cmd;
483 struct ib_ucm_create_id_resp resp;
484 struct ib_ucm_context *ctx;
485 int result;
486
487 if (out_len < sizeof(resp))
488 return -ENOSPC;
489
490 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
491 return -EFAULT;
492
493 mutex_lock(&file->file_mutex);
494 ctx = ib_ucm_ctx_alloc(file);
495 mutex_unlock(&file->file_mutex);
496 if (!ctx)
497 return -ENOMEM;
498
499 ctx->uid = cmd.uid;
500 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
501 ib_ucm_event_handler, ctx);
502 if (IS_ERR(ctx->cm_id)) {
503 result = PTR_ERR(ctx->cm_id);
504 goto err1;
505 }
506
507 resp.id = ctx->id;
508 if (copy_to_user((void __user *)(unsigned long)cmd.response,
509 &resp, sizeof(resp))) {
510 result = -EFAULT;
511 goto err2;
512 }
513 return 0;
514
515 err2:
516 ib_destroy_cm_id(ctx->cm_id);
517 err1:
518 mutex_lock(&ctx_id_mutex);
519 idr_remove(&ctx_id_table, ctx->id);
520 mutex_unlock(&ctx_id_mutex);
521 kfree(ctx);
522 return result;
523 }
524
525 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
526 const char __user *inbuf,
527 int in_len, int out_len)
528 {
529 struct ib_ucm_destroy_id cmd;
530 struct ib_ucm_destroy_id_resp resp;
531 struct ib_ucm_context *ctx;
532 int result = 0;
533
534 if (out_len < sizeof(resp))
535 return -ENOSPC;
536
537 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
538 return -EFAULT;
539
540 mutex_lock(&ctx_id_mutex);
541 ctx = idr_find(&ctx_id_table, cmd.id);
542 if (!ctx)
543 ctx = ERR_PTR(-ENOENT);
544 else if (ctx->file != file)
545 ctx = ERR_PTR(-EINVAL);
546 else
547 idr_remove(&ctx_id_table, ctx->id);
548 mutex_unlock(&ctx_id_mutex);
549
550 if (IS_ERR(ctx))
551 return PTR_ERR(ctx);
552
553 ib_ucm_ctx_put(ctx);
554 wait_for_completion(&ctx->comp);
555
556 /* No new events will be generated after destroying the cm_id. */
557 ib_destroy_cm_id(ctx->cm_id);
558 /* Cleanup events not yet reported to the user. */
559 ib_ucm_cleanup_events(ctx);
560
561 resp.events_reported = ctx->events_reported;
562 if (copy_to_user((void __user *)(unsigned long)cmd.response,
563 &resp, sizeof(resp)))
564 result = -EFAULT;
565
566 kfree(ctx);
567 return result;
568 }
569
570 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
571 const char __user *inbuf,
572 int in_len, int out_len)
573 {
574 struct ib_ucm_attr_id_resp resp;
575 struct ib_ucm_attr_id cmd;
576 struct ib_ucm_context *ctx;
577 int result = 0;
578
579 if (out_len < sizeof(resp))
580 return -ENOSPC;
581
582 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
583 return -EFAULT;
584
585 ctx = ib_ucm_ctx_get(file, cmd.id);
586 if (IS_ERR(ctx))
587 return PTR_ERR(ctx);
588
589 resp.service_id = ctx->cm_id->service_id;
590 resp.service_mask = ctx->cm_id->service_mask;
591 resp.local_id = ctx->cm_id->local_id;
592 resp.remote_id = ctx->cm_id->remote_id;
593
594 if (copy_to_user((void __user *)(unsigned long)cmd.response,
595 &resp, sizeof(resp)))
596 result = -EFAULT;
597
598 ib_ucm_ctx_put(ctx);
599 return result;
600 }
601
602 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
603 const char __user *inbuf,
604 int in_len, int out_len)
605 {
606 struct ib_uverbs_qp_attr resp;
607 struct ib_ucm_init_qp_attr cmd;
608 struct ib_ucm_context *ctx;
609 struct ib_qp_attr qp_attr;
610 int result = 0;
611
612 if (out_len < sizeof(resp))
613 return -ENOSPC;
614
615 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
616 return -EFAULT;
617
618 ctx = ib_ucm_ctx_get(file, cmd.id);
619 if (IS_ERR(ctx))
620 return PTR_ERR(ctx);
621
622 resp.qp_attr_mask = 0;
623 memset(&qp_attr, 0, sizeof qp_attr);
624 qp_attr.qp_state = cmd.qp_state;
625 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
626 if (result)
627 goto out;
628
629 ib_copy_qp_attr_to_user(&resp, &qp_attr);
630
631 if (copy_to_user((void __user *)(unsigned long)cmd.response,
632 &resp, sizeof(resp)))
633 result = -EFAULT;
634
635 out:
636 ib_ucm_ctx_put(ctx);
637 return result;
638 }
639
640 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
641 {
642 service_id &= service_mask;
643
644 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
645 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
646 return -EINVAL;
647
648 return 0;
649 }
650
651 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
652 const char __user *inbuf,
653 int in_len, int out_len)
654 {
655 struct ib_ucm_listen cmd;
656 struct ib_ucm_context *ctx;
657 int result;
658
659 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
660 return -EFAULT;
661
662 ctx = ib_ucm_ctx_get(file, cmd.id);
663 if (IS_ERR(ctx))
664 return PTR_ERR(ctx);
665
666 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
667 if (result)
668 goto out;
669
670 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
671 NULL);
672 out:
673 ib_ucm_ctx_put(ctx);
674 return result;
675 }
676
677 static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
678 const char __user *inbuf,
679 int in_len, int out_len)
680 {
681 struct ib_ucm_notify cmd;
682 struct ib_ucm_context *ctx;
683 int result;
684
685 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
686 return -EFAULT;
687
688 ctx = ib_ucm_ctx_get(file, cmd.id);
689 if (IS_ERR(ctx))
690 return PTR_ERR(ctx);
691
692 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
693 ib_ucm_ctx_put(ctx);
694 return result;
695 }
696
697 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
698 {
699 void *data;
700
701 *dest = NULL;
702
703 if (!len)
704 return 0;
705
706 data = memdup_user((void __user *)(unsigned long)src, len);
707 if (IS_ERR(data))
708 return PTR_ERR(data);
709
710 *dest = data;
711 return 0;
712 }
713
714 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
715 {
716 struct ib_user_path_rec upath;
717 struct ib_sa_path_rec *sa_path;
718
719 *path = NULL;
720
721 if (!src)
722 return 0;
723
724 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
725 if (!sa_path)
726 return -ENOMEM;
727
728 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
729 sizeof(upath))) {
730
731 kfree(sa_path);
732 return -EFAULT;
733 }
734
735 ib_copy_path_rec_from_user(sa_path, &upath);
736 *path = sa_path;
737 return 0;
738 }
739
740 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
741 const char __user *inbuf,
742 int in_len, int out_len)
743 {
744 struct ib_cm_req_param param;
745 struct ib_ucm_context *ctx;
746 struct ib_ucm_req cmd;
747 int result;
748
749 param.private_data = NULL;
750 param.primary_path = NULL;
751 param.alternate_path = NULL;
752
753 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
754 return -EFAULT;
755
756 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
757 if (result)
758 goto done;
759
760 result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
761 if (result)
762 goto done;
763
764 result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
765 if (result)
766 goto done;
767
768 param.private_data_len = cmd.len;
769 param.service_id = cmd.sid;
770 param.qp_num = cmd.qpn;
771 param.qp_type = cmd.qp_type;
772 param.starting_psn = cmd.psn;
773 param.peer_to_peer = cmd.peer_to_peer;
774 param.responder_resources = cmd.responder_resources;
775 param.initiator_depth = cmd.initiator_depth;
776 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
777 param.flow_control = cmd.flow_control;
778 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
779 param.retry_count = cmd.retry_count;
780 param.rnr_retry_count = cmd.rnr_retry_count;
781 param.max_cm_retries = cmd.max_cm_retries;
782 param.srq = cmd.srq;
783
784 ctx = ib_ucm_ctx_get(file, cmd.id);
785 if (!IS_ERR(ctx)) {
786 result = ib_send_cm_req(ctx->cm_id, &param);
787 ib_ucm_ctx_put(ctx);
788 } else
789 result = PTR_ERR(ctx);
790
791 done:
792 kfree(param.private_data);
793 kfree(param.primary_path);
794 kfree(param.alternate_path);
795 return result;
796 }
797
798 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
799 const char __user *inbuf,
800 int in_len, int out_len)
801 {
802 struct ib_cm_rep_param param;
803 struct ib_ucm_context *ctx;
804 struct ib_ucm_rep cmd;
805 int result;
806
807 param.private_data = NULL;
808
809 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
810 return -EFAULT;
811
812 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
813 if (result)
814 return result;
815
816 param.qp_num = cmd.qpn;
817 param.starting_psn = cmd.psn;
818 param.private_data_len = cmd.len;
819 param.responder_resources = cmd.responder_resources;
820 param.initiator_depth = cmd.initiator_depth;
821 param.failover_accepted = cmd.failover_accepted;
822 param.flow_control = cmd.flow_control;
823 param.rnr_retry_count = cmd.rnr_retry_count;
824 param.srq = cmd.srq;
825
826 ctx = ib_ucm_ctx_get(file, cmd.id);
827 if (!IS_ERR(ctx)) {
828 ctx->uid = cmd.uid;
829 result = ib_send_cm_rep(ctx->cm_id, &param);
830 ib_ucm_ctx_put(ctx);
831 } else
832 result = PTR_ERR(ctx);
833
834 kfree(param.private_data);
835 return result;
836 }
837
838 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
839 const char __user *inbuf, int in_len,
840 int (*func)(struct ib_cm_id *cm_id,
841 const void *private_data,
842 u8 private_data_len))
843 {
844 struct ib_ucm_private_data cmd;
845 struct ib_ucm_context *ctx;
846 const void *private_data = NULL;
847 int result;
848
849 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
850 return -EFAULT;
851
852 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
853 if (result)
854 return result;
855
856 ctx = ib_ucm_ctx_get(file, cmd.id);
857 if (!IS_ERR(ctx)) {
858 result = func(ctx->cm_id, private_data, cmd.len);
859 ib_ucm_ctx_put(ctx);
860 } else
861 result = PTR_ERR(ctx);
862
863 kfree(private_data);
864 return result;
865 }
866
867 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
868 const char __user *inbuf,
869 int in_len, int out_len)
870 {
871 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
872 }
873
874 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
875 const char __user *inbuf,
876 int in_len, int out_len)
877 {
878 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
879 }
880
881 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
882 const char __user *inbuf,
883 int in_len, int out_len)
884 {
885 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
886 }
887
888 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
889 const char __user *inbuf, int in_len,
890 int (*func)(struct ib_cm_id *cm_id,
891 int status,
892 const void *info,
893 u8 info_len,
894 const void *data,
895 u8 data_len))
896 {
897 struct ib_ucm_context *ctx;
898 struct ib_ucm_info cmd;
899 const void *data = NULL;
900 const void *info = NULL;
901 int result;
902
903 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
904 return -EFAULT;
905
906 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
907 if (result)
908 goto done;
909
910 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
911 if (result)
912 goto done;
913
914 ctx = ib_ucm_ctx_get(file, cmd.id);
915 if (!IS_ERR(ctx)) {
916 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
917 data, cmd.data_len);
918 ib_ucm_ctx_put(ctx);
919 } else
920 result = PTR_ERR(ctx);
921
922 done:
923 kfree(data);
924 kfree(info);
925 return result;
926 }
927
928 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
929 const char __user *inbuf,
930 int in_len, int out_len)
931 {
932 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
933 }
934
935 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
936 const char __user *inbuf,
937 int in_len, int out_len)
938 {
939 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
940 }
941
942 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
943 const char __user *inbuf,
944 int in_len, int out_len)
945 {
946 struct ib_ucm_context *ctx;
947 struct ib_ucm_mra cmd;
948 const void *data = NULL;
949 int result;
950
951 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
952 return -EFAULT;
953
954 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
955 if (result)
956 return result;
957
958 ctx = ib_ucm_ctx_get(file, cmd.id);
959 if (!IS_ERR(ctx)) {
960 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
961 ib_ucm_ctx_put(ctx);
962 } else
963 result = PTR_ERR(ctx);
964
965 kfree(data);
966 return result;
967 }
968
969 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
970 const char __user *inbuf,
971 int in_len, int out_len)
972 {
973 struct ib_ucm_context *ctx;
974 struct ib_sa_path_rec *path = NULL;
975 struct ib_ucm_lap cmd;
976 const void *data = NULL;
977 int result;
978
979 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
980 return -EFAULT;
981
982 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
983 if (result)
984 goto done;
985
986 result = ib_ucm_path_get(&path, cmd.path);
987 if (result)
988 goto done;
989
990 ctx = ib_ucm_ctx_get(file, cmd.id);
991 if (!IS_ERR(ctx)) {
992 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
993 ib_ucm_ctx_put(ctx);
994 } else
995 result = PTR_ERR(ctx);
996
997 done:
998 kfree(data);
999 kfree(path);
1000 return result;
1001 }
1002
1003 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1004 const char __user *inbuf,
1005 int in_len, int out_len)
1006 {
1007 struct ib_cm_sidr_req_param param;
1008 struct ib_ucm_context *ctx;
1009 struct ib_ucm_sidr_req cmd;
1010 int result;
1011
1012 param.private_data = NULL;
1013 param.path = NULL;
1014
1015 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1016 return -EFAULT;
1017
1018 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1019 if (result)
1020 goto done;
1021
1022 result = ib_ucm_path_get(&param.path, cmd.path);
1023 if (result)
1024 goto done;
1025
1026 param.private_data_len = cmd.len;
1027 param.service_id = cmd.sid;
1028 param.timeout_ms = cmd.timeout;
1029 param.max_cm_retries = cmd.max_cm_retries;
1030
1031 ctx = ib_ucm_ctx_get(file, cmd.id);
1032 if (!IS_ERR(ctx)) {
1033 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1034 ib_ucm_ctx_put(ctx);
1035 } else
1036 result = PTR_ERR(ctx);
1037
1038 done:
1039 kfree(param.private_data);
1040 kfree(param.path);
1041 return result;
1042 }
1043
1044 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1045 const char __user *inbuf,
1046 int in_len, int out_len)
1047 {
1048 struct ib_cm_sidr_rep_param param;
1049 struct ib_ucm_sidr_rep cmd;
1050 struct ib_ucm_context *ctx;
1051 int result;
1052
1053 param.info = NULL;
1054
1055 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1056 return -EFAULT;
1057
1058 result = ib_ucm_alloc_data(&param.private_data,
1059 cmd.data, cmd.data_len);
1060 if (result)
1061 goto done;
1062
1063 result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1064 if (result)
1065 goto done;
1066
1067 param.qp_num = cmd.qpn;
1068 param.qkey = cmd.qkey;
1069 param.status = cmd.status;
1070 param.info_length = cmd.info_len;
1071 param.private_data_len = cmd.data_len;
1072
1073 ctx = ib_ucm_ctx_get(file, cmd.id);
1074 if (!IS_ERR(ctx)) {
1075 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1076 ib_ucm_ctx_put(ctx);
1077 } else
1078 result = PTR_ERR(ctx);
1079
1080 done:
1081 kfree(param.private_data);
1082 kfree(param.info);
1083 return result;
1084 }
1085
1086 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1087 const char __user *inbuf,
1088 int in_len, int out_len) = {
1089 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1090 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1091 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1092 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1093 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1094 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1095 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1096 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1097 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1098 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1099 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1100 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1101 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1102 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1103 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1104 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1105 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1106 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1107 };
1108
1109 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1110 size_t len, loff_t *pos)
1111 {
1112 struct ib_ucm_file *file = filp->private_data;
1113 struct ib_ucm_cmd_hdr hdr;
1114 ssize_t result;
1115
1116 if (len < sizeof(hdr))
1117 return -EINVAL;
1118
1119 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1120 return -EFAULT;
1121
1122 if (hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1123 return -EINVAL;
1124
1125 if (hdr.in + sizeof(hdr) > len)
1126 return -EINVAL;
1127
1128 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1129 hdr.in, hdr.out);
1130 if (!result)
1131 result = len;
1132
1133 return result;
1134 }
1135
1136 static unsigned int ib_ucm_poll(struct file *filp,
1137 struct poll_table_struct *wait)
1138 {
1139 struct ib_ucm_file *file = filp->private_data;
1140 unsigned int mask = 0;
1141
1142 poll_wait(filp, &file->poll_wait, wait);
1143
1144 if (!list_empty(&file->events))
1145 mask = POLLIN | POLLRDNORM;
1146
1147 return mask;
1148 }
1149
1150 /*
1151 * ib_ucm_open() does not need the BKL:
1152 *
1153 * - no global state is referred to;
1154 * - there is no ioctl method to race against;
1155 * - no further module initialization is required for open to work
1156 * after the device is registered.
1157 */
1158 static int ib_ucm_open(struct inode *inode, struct file *filp)
1159 {
1160 struct ib_ucm_file *file;
1161
1162 file = kmalloc(sizeof(*file), GFP_KERNEL);
1163 if (!file)
1164 return -ENOMEM;
1165
1166 INIT_LIST_HEAD(&file->events);
1167 INIT_LIST_HEAD(&file->ctxs);
1168 init_waitqueue_head(&file->poll_wait);
1169
1170 mutex_init(&file->file_mutex);
1171
1172 filp->private_data = file;
1173 file->filp = filp;
1174 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1175
1176 return nonseekable_open(inode, filp);
1177 }
1178
1179 static int ib_ucm_close(struct inode *inode, struct file *filp)
1180 {
1181 struct ib_ucm_file *file = filp->private_data;
1182 struct ib_ucm_context *ctx;
1183
1184 mutex_lock(&file->file_mutex);
1185 while (!list_empty(&file->ctxs)) {
1186 ctx = list_entry(file->ctxs.next,
1187 struct ib_ucm_context, file_list);
1188 mutex_unlock(&file->file_mutex);
1189
1190 mutex_lock(&ctx_id_mutex);
1191 idr_remove(&ctx_id_table, ctx->id);
1192 mutex_unlock(&ctx_id_mutex);
1193
1194 ib_destroy_cm_id(ctx->cm_id);
1195 ib_ucm_cleanup_events(ctx);
1196 kfree(ctx);
1197
1198 mutex_lock(&file->file_mutex);
1199 }
1200 mutex_unlock(&file->file_mutex);
1201 kfree(file);
1202 return 0;
1203 }
1204
1205 static void ib_ucm_release_dev(struct device *dev)
1206 {
1207 struct ib_ucm_device *ucm_dev;
1208
1209 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1210 cdev_del(&ucm_dev->cdev);
1211 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1212 clear_bit(ucm_dev->devnum, dev_map);
1213 else
1214 clear_bit(ucm_dev->devnum - IB_UCM_MAX_DEVICES, dev_map);
1215 kfree(ucm_dev);
1216 }
1217
1218 static const struct file_operations ucm_fops = {
1219 .owner = THIS_MODULE,
1220 .open = ib_ucm_open,
1221 .release = ib_ucm_close,
1222 .write = ib_ucm_write,
1223 .poll = ib_ucm_poll,
1224 .llseek = no_llseek,
1225 };
1226
1227 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1228 char *buf)
1229 {
1230 struct ib_ucm_device *ucm_dev;
1231
1232 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1233 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1234 }
1235 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1236
1237 static dev_t overflow_maj;
1238 static DECLARE_BITMAP(overflow_map, IB_UCM_MAX_DEVICES);
1239 static int find_overflow_devnum(void)
1240 {
1241 int ret;
1242
1243 if (!overflow_maj) {
1244 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UCM_MAX_DEVICES,
1245 "infiniband_cm");
1246 if (ret) {
1247 printk(KERN_ERR "ucm: couldn't register dynamic device number\n");
1248 return ret;
1249 }
1250 }
1251
1252 ret = find_first_zero_bit(overflow_map, IB_UCM_MAX_DEVICES);
1253 if (ret >= IB_UCM_MAX_DEVICES)
1254 return -1;
1255
1256 return ret;
1257 }
1258
1259 static void ib_ucm_add_one(struct ib_device *device)
1260 {
1261 int devnum;
1262 dev_t base;
1263 struct ib_ucm_device *ucm_dev;
1264
1265 if (!device->alloc_ucontext ||
1266 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1267 return;
1268
1269 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1270 if (!ucm_dev)
1271 return;
1272
1273 ucm_dev->ib_dev = device;
1274
1275 devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1276 if (devnum >= IB_UCM_MAX_DEVICES) {
1277 devnum = find_overflow_devnum();
1278 if (devnum < 0)
1279 goto err;
1280
1281 ucm_dev->devnum = devnum + IB_UCM_MAX_DEVICES;
1282 base = devnum + overflow_maj;
1283 set_bit(devnum, overflow_map);
1284 } else {
1285 ucm_dev->devnum = devnum;
1286 base = devnum + IB_UCM_BASE_DEV;
1287 set_bit(devnum, dev_map);
1288 }
1289
1290 cdev_init(&ucm_dev->cdev, &ucm_fops);
1291 ucm_dev->cdev.owner = THIS_MODULE;
1292 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1293 if (cdev_add(&ucm_dev->cdev, base, 1))
1294 goto err;
1295
1296 ucm_dev->dev.class = &cm_class;
1297 ucm_dev->dev.parent = device->dma_device;
1298 ucm_dev->dev.devt = ucm_dev->cdev.dev;
1299 ucm_dev->dev.release = ib_ucm_release_dev;
1300 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1301 if (device_register(&ucm_dev->dev))
1302 goto err_cdev;
1303
1304 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1305 goto err_dev;
1306
1307 ib_set_client_data(device, &ucm_client, ucm_dev);
1308 return;
1309
1310 err_dev:
1311 device_unregister(&ucm_dev->dev);
1312 err_cdev:
1313 cdev_del(&ucm_dev->cdev);
1314 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1315 clear_bit(devnum, dev_map);
1316 else
1317 clear_bit(devnum, overflow_map);
1318 err:
1319 kfree(ucm_dev);
1320 return;
1321 }
1322
1323 static void ib_ucm_remove_one(struct ib_device *device)
1324 {
1325 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1326
1327 if (!ucm_dev)
1328 return;
1329
1330 device_unregister(&ucm_dev->dev);
1331 }
1332
1333 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1334 __stringify(IB_USER_CM_ABI_VERSION));
1335
1336 static int __init ib_ucm_init(void)
1337 {
1338 int ret;
1339
1340 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1341 "infiniband_cm");
1342 if (ret) {
1343 printk(KERN_ERR "ucm: couldn't register device number\n");
1344 goto error1;
1345 }
1346
1347 ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
1348 if (ret) {
1349 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1350 goto error2;
1351 }
1352
1353 ret = ib_register_client(&ucm_client);
1354 if (ret) {
1355 printk(KERN_ERR "ucm: couldn't register client\n");
1356 goto error3;
1357 }
1358 return 0;
1359
1360 error3:
1361 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1362 error2:
1363 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1364 error1:
1365 return ret;
1366 }
1367
1368 static void __exit ib_ucm_cleanup(void)
1369 {
1370 ib_unregister_client(&ucm_client);
1371 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1372 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1373 if (overflow_maj)
1374 unregister_chrdev_region(overflow_maj, IB_UCM_MAX_DEVICES);
1375 idr_destroy(&ctx_id_table);
1376 }
1377
1378 module_init(ib_ucm_init);
1379 module_exit(ib_ucm_cleanup);