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IB: kmemdup() cleanup
[linux-2.6/linux-loongson.git] / drivers / infiniband / core / ucm.c
blobb4894ba223b75ef992d37b5a6641e0373f3dd75e
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 * $Id: ucm.c 4311 2005-12-05 18:42:01Z sean.hefty $
34 */
35
36 #include <linux/completion.h>
37 #include <linux/init.h>
38 #include <linux/fs.h>
39 #include <linux/module.h>
40 #include <linux/device.h>
41 #include <linux/err.h>
42 #include <linux/poll.h>
43 #include <linux/file.h>
44 #include <linux/mount.h>
45 #include <linux/cdev.h>
46 #include <linux/idr.h>
47 #include <linux/mutex.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 dev;
62 struct class_device class_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
165 /* clear incoming connections. */
166 if (ib_ucm_new_cm_id(uevent->resp.event))
167 ib_destroy_cm_id(uevent->cm_id);
168
169 kfree(uevent);
170 }
171 mutex_unlock(&ctx->file->file_mutex);
172 }
173
174 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
175 {
176 struct ib_ucm_context *ctx;
177 int result;
178
179 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
180 if (!ctx)
181 return NULL;
182
183 atomic_set(&ctx->ref, 1);
184 init_completion(&ctx->comp);
185 ctx->file = file;
186 INIT_LIST_HEAD(&ctx->events);
187
188 do {
189 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
190 if (!result)
191 goto error;
192
193 mutex_lock(&ctx_id_mutex);
194 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
195 mutex_unlock(&ctx_id_mutex);
196 } while (result == -EAGAIN);
197
198 if (result)
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 DEFINE_WAIT(wait);
399
400 if (out_len < sizeof(struct ib_ucm_event_resp))
401 return -ENOSPC;
402
403 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
404 return -EFAULT;
405
406 mutex_lock(&file->file_mutex);
407 while (list_empty(&file->events)) {
408
409 if (file->filp->f_flags & O_NONBLOCK) {
410 result = -EAGAIN;
411 break;
412 }
413
414 if (signal_pending(current)) {
415 result = -ERESTARTSYS;
416 break;
417 }
418
419 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
420
421 mutex_unlock(&file->file_mutex);
422 schedule();
423 mutex_lock(&file->file_mutex);
424
425 finish_wait(&file->poll_wait, &wait);
426 }
427
428 if (result)
429 goto done;
430
431 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
432
433 if (ib_ucm_new_cm_id(uevent->resp.event)) {
434 ctx = ib_ucm_ctx_alloc(file);
435 if (!ctx) {
436 result = -ENOMEM;
437 goto done;
438 }
439
440 ctx->cm_id = uevent->cm_id;
441 ctx->cm_id->context = ctx;
442 uevent->resp.id = ctx->id;
443 }
444
445 if (copy_to_user((void __user *)(unsigned long)cmd.response,
446 &uevent->resp, sizeof(uevent->resp))) {
447 result = -EFAULT;
448 goto done;
449 }
450
451 if (uevent->data) {
452 if (cmd.data_len < uevent->data_len) {
453 result = -ENOMEM;
454 goto done;
455 }
456 if (copy_to_user((void __user *)(unsigned long)cmd.data,
457 uevent->data, uevent->data_len)) {
458 result = -EFAULT;
459 goto done;
460 }
461 }
462
463 if (uevent->info) {
464 if (cmd.info_len < uevent->info_len) {
465 result = -ENOMEM;
466 goto done;
467 }
468 if (copy_to_user((void __user *)(unsigned long)cmd.info,
469 uevent->info, uevent->info_len)) {
470 result = -EFAULT;
471 goto done;
472 }
473 }
474
475 list_del(&uevent->file_list);
476 list_del(&uevent->ctx_list);
477 uevent->ctx->events_reported++;
478
479 kfree(uevent->data);
480 kfree(uevent->info);
481 kfree(uevent);
482 done:
483 mutex_unlock(&file->file_mutex);
484 return result;
485 }
486
487 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
488 const char __user *inbuf,
489 int in_len, int out_len)
490 {
491 struct ib_ucm_create_id cmd;
492 struct ib_ucm_create_id_resp resp;
493 struct ib_ucm_context *ctx;
494 int result;
495
496 if (out_len < sizeof(resp))
497 return -ENOSPC;
498
499 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
500 return -EFAULT;
501
502 mutex_lock(&file->file_mutex);
503 ctx = ib_ucm_ctx_alloc(file);
504 mutex_unlock(&file->file_mutex);
505 if (!ctx)
506 return -ENOMEM;
507
508 ctx->uid = cmd.uid;
509 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
510 ib_ucm_event_handler, ctx);
511 if (IS_ERR(ctx->cm_id)) {
512 result = PTR_ERR(ctx->cm_id);
513 goto err1;
514 }
515
516 resp.id = ctx->id;
517 if (copy_to_user((void __user *)(unsigned long)cmd.response,
518 &resp, sizeof(resp))) {
519 result = -EFAULT;
520 goto err2;
521 }
522 return 0;
523
524 err2:
525 ib_destroy_cm_id(ctx->cm_id);
526 err1:
527 mutex_lock(&ctx_id_mutex);
528 idr_remove(&ctx_id_table, ctx->id);
529 mutex_unlock(&ctx_id_mutex);
530 kfree(ctx);
531 return result;
532 }
533
534 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
535 const char __user *inbuf,
536 int in_len, int out_len)
537 {
538 struct ib_ucm_destroy_id cmd;
539 struct ib_ucm_destroy_id_resp resp;
540 struct ib_ucm_context *ctx;
541 int result = 0;
542
543 if (out_len < sizeof(resp))
544 return -ENOSPC;
545
546 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
547 return -EFAULT;
548
549 mutex_lock(&ctx_id_mutex);
550 ctx = idr_find(&ctx_id_table, cmd.id);
551 if (!ctx)
552 ctx = ERR_PTR(-ENOENT);
553 else if (ctx->file != file)
554 ctx = ERR_PTR(-EINVAL);
555 else
556 idr_remove(&ctx_id_table, ctx->id);
557 mutex_unlock(&ctx_id_mutex);
558
559 if (IS_ERR(ctx))
560 return PTR_ERR(ctx);
561
562 ib_ucm_ctx_put(ctx);
563 wait_for_completion(&ctx->comp);
564
565 /* No new events will be generated after destroying the cm_id. */
566 ib_destroy_cm_id(ctx->cm_id);
567 /* Cleanup events not yet reported to the user. */
568 ib_ucm_cleanup_events(ctx);
569
570 resp.events_reported = ctx->events_reported;
571 if (copy_to_user((void __user *)(unsigned long)cmd.response,
572 &resp, sizeof(resp)))
573 result = -EFAULT;
574
575 kfree(ctx);
576 return result;
577 }
578
579 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
580 const char __user *inbuf,
581 int in_len, int out_len)
582 {
583 struct ib_ucm_attr_id_resp resp;
584 struct ib_ucm_attr_id cmd;
585 struct ib_ucm_context *ctx;
586 int result = 0;
587
588 if (out_len < sizeof(resp))
589 return -ENOSPC;
590
591 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
592 return -EFAULT;
593
594 ctx = ib_ucm_ctx_get(file, cmd.id);
595 if (IS_ERR(ctx))
596 return PTR_ERR(ctx);
597
598 resp.service_id = ctx->cm_id->service_id;
599 resp.service_mask = ctx->cm_id->service_mask;
600 resp.local_id = ctx->cm_id->local_id;
601 resp.remote_id = ctx->cm_id->remote_id;
602
603 if (copy_to_user((void __user *)(unsigned long)cmd.response,
604 &resp, sizeof(resp)))
605 result = -EFAULT;
606
607 ib_ucm_ctx_put(ctx);
608 return result;
609 }
610
611 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
612 const char __user *inbuf,
613 int in_len, int out_len)
614 {
615 struct ib_uverbs_qp_attr resp;
616 struct ib_ucm_init_qp_attr cmd;
617 struct ib_ucm_context *ctx;
618 struct ib_qp_attr qp_attr;
619 int result = 0;
620
621 if (out_len < sizeof(resp))
622 return -ENOSPC;
623
624 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
625 return -EFAULT;
626
627 ctx = ib_ucm_ctx_get(file, cmd.id);
628 if (IS_ERR(ctx))
629 return PTR_ERR(ctx);
630
631 resp.qp_attr_mask = 0;
632 memset(&qp_attr, 0, sizeof qp_attr);
633 qp_attr.qp_state = cmd.qp_state;
634 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
635 if (result)
636 goto out;
637
638 ib_copy_qp_attr_to_user(&resp, &qp_attr);
639
640 if (copy_to_user((void __user *)(unsigned long)cmd.response,
641 &resp, sizeof(resp)))
642 result = -EFAULT;
643
644 out:
645 ib_ucm_ctx_put(ctx);
646 return result;
647 }
648
649 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
650 {
651 service_id &= service_mask;
652
653 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
654 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
655 return -EINVAL;
656
657 return 0;
658 }
659
660 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
661 const char __user *inbuf,
662 int in_len, int out_len)
663 {
664 struct ib_ucm_listen cmd;
665 struct ib_ucm_context *ctx;
666 int result;
667
668 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
669 return -EFAULT;
670
671 ctx = ib_ucm_ctx_get(file, cmd.id);
672 if (IS_ERR(ctx))
673 return PTR_ERR(ctx);
674
675 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
676 if (result)
677 goto out;
678
679 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
680 NULL);
681 out:
682 ib_ucm_ctx_put(ctx);
683 return result;
684 }
685
686 static ssize_t ib_ucm_establish(struct ib_ucm_file *file,
687 const char __user *inbuf,
688 int in_len, int out_len)
689 {
690 struct ib_ucm_establish cmd;
691 struct ib_ucm_context *ctx;
692 int result;
693
694 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
695 return -EFAULT;
696
697 ctx = ib_ucm_ctx_get(file, cmd.id);
698 if (IS_ERR(ctx))
699 return PTR_ERR(ctx);
700
701 result = ib_cm_establish(ctx->cm_id);
702 ib_ucm_ctx_put(ctx);
703 return result;
704 }
705
706 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
707 {
708 void *data;
709
710 *dest = NULL;
711
712 if (!len)
713 return 0;
714
715 data = kmalloc(len, GFP_KERNEL);
716 if (!data)
717 return -ENOMEM;
718
719 if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
720 kfree(data);
721 return -EFAULT;
722 }
723
724 *dest = data;
725 return 0;
726 }
727
728 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
729 {
730 struct ib_user_path_rec upath;
731 struct ib_sa_path_rec *sa_path;
732
733 *path = NULL;
734
735 if (!src)
736 return 0;
737
738 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
739 if (!sa_path)
740 return -ENOMEM;
741
742 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
743 sizeof(upath))) {
744
745 kfree(sa_path);
746 return -EFAULT;
747 }
748
749 ib_copy_path_rec_from_user(sa_path, &upath);
750 *path = sa_path;
751 return 0;
752 }
753
754 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
755 const char __user *inbuf,
756 int in_len, int out_len)
757 {
758 struct ib_cm_req_param param;
759 struct ib_ucm_context *ctx;
760 struct ib_ucm_req cmd;
761 int result;
762
763 param.private_data = NULL;
764 param.primary_path = NULL;
765 param.alternate_path = NULL;
766
767 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
768 return -EFAULT;
769
770 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
771 if (result)
772 goto done;
773
774 result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
775 if (result)
776 goto done;
777
778 result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
779 if (result)
780 goto done;
781
782 param.private_data_len = cmd.len;
783 param.service_id = cmd.sid;
784 param.qp_num = cmd.qpn;
785 param.qp_type = cmd.qp_type;
786 param.starting_psn = cmd.psn;
787 param.peer_to_peer = cmd.peer_to_peer;
788 param.responder_resources = cmd.responder_resources;
789 param.initiator_depth = cmd.initiator_depth;
790 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
791 param.flow_control = cmd.flow_control;
792 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
793 param.retry_count = cmd.retry_count;
794 param.rnr_retry_count = cmd.rnr_retry_count;
795 param.max_cm_retries = cmd.max_cm_retries;
796 param.srq = cmd.srq;
797
798 ctx = ib_ucm_ctx_get(file, cmd.id);
799 if (!IS_ERR(ctx)) {
800 result = ib_send_cm_req(ctx->cm_id, &param);
801 ib_ucm_ctx_put(ctx);
802 } else
803 result = PTR_ERR(ctx);
804
805 done:
806 kfree(param.private_data);
807 kfree(param.primary_path);
808 kfree(param.alternate_path);
809 return result;
810 }
811
812 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
813 const char __user *inbuf,
814 int in_len, int out_len)
815 {
816 struct ib_cm_rep_param param;
817 struct ib_ucm_context *ctx;
818 struct ib_ucm_rep cmd;
819 int result;
820
821 param.private_data = NULL;
822
823 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
824 return -EFAULT;
825
826 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
827 if (result)
828 return result;
829
830 param.qp_num = cmd.qpn;
831 param.starting_psn = cmd.psn;
832 param.private_data_len = cmd.len;
833 param.responder_resources = cmd.responder_resources;
834 param.initiator_depth = cmd.initiator_depth;
835 param.target_ack_delay = cmd.target_ack_delay;
836 param.failover_accepted = cmd.failover_accepted;
837 param.flow_control = cmd.flow_control;
838 param.rnr_retry_count = cmd.rnr_retry_count;
839 param.srq = cmd.srq;
840
841 ctx = ib_ucm_ctx_get(file, cmd.id);
842 if (!IS_ERR(ctx)) {
843 ctx->uid = cmd.uid;
844 result = ib_send_cm_rep(ctx->cm_id, &param);
845 ib_ucm_ctx_put(ctx);
846 } else
847 result = PTR_ERR(ctx);
848
849 kfree(param.private_data);
850 return result;
851 }
852
853 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
854 const char __user *inbuf, int in_len,
855 int (*func)(struct ib_cm_id *cm_id,
856 const void *private_data,
857 u8 private_data_len))
858 {
859 struct ib_ucm_private_data cmd;
860 struct ib_ucm_context *ctx;
861 const void *private_data = NULL;
862 int result;
863
864 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
865 return -EFAULT;
866
867 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
868 if (result)
869 return result;
870
871 ctx = ib_ucm_ctx_get(file, cmd.id);
872 if (!IS_ERR(ctx)) {
873 result = func(ctx->cm_id, private_data, cmd.len);
874 ib_ucm_ctx_put(ctx);
875 } else
876 result = PTR_ERR(ctx);
877
878 kfree(private_data);
879 return result;
880 }
881
882 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
883 const char __user *inbuf,
884 int in_len, int out_len)
885 {
886 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
887 }
888
889 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
890 const char __user *inbuf,
891 int in_len, int out_len)
892 {
893 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
894 }
895
896 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
897 const char __user *inbuf,
898 int in_len, int out_len)
899 {
900 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
901 }
902
903 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
904 const char __user *inbuf, int in_len,
905 int (*func)(struct ib_cm_id *cm_id,
906 int status,
907 const void *info,
908 u8 info_len,
909 const void *data,
910 u8 data_len))
911 {
912 struct ib_ucm_context *ctx;
913 struct ib_ucm_info cmd;
914 const void *data = NULL;
915 const void *info = NULL;
916 int result;
917
918 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
919 return -EFAULT;
920
921 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
922 if (result)
923 goto done;
924
925 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
926 if (result)
927 goto done;
928
929 ctx = ib_ucm_ctx_get(file, cmd.id);
930 if (!IS_ERR(ctx)) {
931 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
932 data, cmd.data_len);
933 ib_ucm_ctx_put(ctx);
934 } else
935 result = PTR_ERR(ctx);
936
937 done:
938 kfree(data);
939 kfree(info);
940 return result;
941 }
942
943 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
944 const char __user *inbuf,
945 int in_len, int out_len)
946 {
947 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
948 }
949
950 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
951 const char __user *inbuf,
952 int in_len, int out_len)
953 {
954 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
955 }
956
957 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
958 const char __user *inbuf,
959 int in_len, int out_len)
960 {
961 struct ib_ucm_context *ctx;
962 struct ib_ucm_mra cmd;
963 const void *data = NULL;
964 int result;
965
966 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
967 return -EFAULT;
968
969 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
970 if (result)
971 return result;
972
973 ctx = ib_ucm_ctx_get(file, cmd.id);
974 if (!IS_ERR(ctx)) {
975 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
976 ib_ucm_ctx_put(ctx);
977 } else
978 result = PTR_ERR(ctx);
979
980 kfree(data);
981 return result;
982 }
983
984 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
985 const char __user *inbuf,
986 int in_len, int out_len)
987 {
988 struct ib_ucm_context *ctx;
989 struct ib_sa_path_rec *path = NULL;
990 struct ib_ucm_lap cmd;
991 const void *data = NULL;
992 int result;
993
994 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
995 return -EFAULT;
996
997 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
998 if (result)
999 goto done;
1000
1001 result = ib_ucm_path_get(&path, cmd.path);
1002 if (result)
1003 goto done;
1004
1005 ctx = ib_ucm_ctx_get(file, cmd.id);
1006 if (!IS_ERR(ctx)) {
1007 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
1008 ib_ucm_ctx_put(ctx);
1009 } else
1010 result = PTR_ERR(ctx);
1011
1012 done:
1013 kfree(data);
1014 kfree(path);
1015 return result;
1016 }
1017
1018 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1019 const char __user *inbuf,
1020 int in_len, int out_len)
1021 {
1022 struct ib_cm_sidr_req_param param;
1023 struct ib_ucm_context *ctx;
1024 struct ib_ucm_sidr_req cmd;
1025 int result;
1026
1027 param.private_data = NULL;
1028 param.path = NULL;
1029
1030 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1031 return -EFAULT;
1032
1033 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1034 if (result)
1035 goto done;
1036
1037 result = ib_ucm_path_get(&param.path, cmd.path);
1038 if (result)
1039 goto done;
1040
1041 param.private_data_len = cmd.len;
1042 param.service_id = cmd.sid;
1043 param.timeout_ms = cmd.timeout;
1044 param.max_cm_retries = cmd.max_cm_retries;
1045
1046 ctx = ib_ucm_ctx_get(file, cmd.id);
1047 if (!IS_ERR(ctx)) {
1048 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1049 ib_ucm_ctx_put(ctx);
1050 } else
1051 result = PTR_ERR(ctx);
1052
1053 done:
1054 kfree(param.private_data);
1055 kfree(param.path);
1056 return result;
1057 }
1058
1059 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1060 const char __user *inbuf,
1061 int in_len, int out_len)
1062 {
1063 struct ib_cm_sidr_rep_param param;
1064 struct ib_ucm_sidr_rep cmd;
1065 struct ib_ucm_context *ctx;
1066 int result;
1067
1068 param.info = NULL;
1069
1070 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1071 return -EFAULT;
1072
1073 result = ib_ucm_alloc_data(&param.private_data,
1074 cmd.data, cmd.data_len);
1075 if (result)
1076 goto done;
1077
1078 result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1079 if (result)
1080 goto done;
1081
1082 param.qp_num = cmd.qpn;
1083 param.qkey = cmd.qkey;
1084 param.status = cmd.status;
1085 param.info_length = cmd.info_len;
1086 param.private_data_len = cmd.data_len;
1087
1088 ctx = ib_ucm_ctx_get(file, cmd.id);
1089 if (!IS_ERR(ctx)) {
1090 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1091 ib_ucm_ctx_put(ctx);
1092 } else
1093 result = PTR_ERR(ctx);
1094
1095 done:
1096 kfree(param.private_data);
1097 kfree(param.info);
1098 return result;
1099 }
1100
1101 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1102 const char __user *inbuf,
1103 int in_len, int out_len) = {
1104 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1105 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1106 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1107 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1108 [IB_USER_CM_CMD_ESTABLISH] = ib_ucm_establish,
1109 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1110 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1111 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1112 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1113 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1114 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1115 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1116 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1117 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1118 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1119 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1120 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1121 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1122 };
1123
1124 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1125 size_t len, loff_t *pos)
1126 {
1127 struct ib_ucm_file *file = filp->private_data;
1128 struct ib_ucm_cmd_hdr hdr;
1129 ssize_t result;
1130
1131 if (len < sizeof(hdr))
1132 return -EINVAL;
1133
1134 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1135 return -EFAULT;
1136
1137 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1138 return -EINVAL;
1139
1140 if (hdr.in + sizeof(hdr) > len)
1141 return -EINVAL;
1142
1143 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1144 hdr.in, hdr.out);
1145 if (!result)
1146 result = len;
1147
1148 return result;
1149 }
1150
1151 static unsigned int ib_ucm_poll(struct file *filp,
1152 struct poll_table_struct *wait)
1153 {
1154 struct ib_ucm_file *file = filp->private_data;
1155 unsigned int mask = 0;
1156
1157 poll_wait(filp, &file->poll_wait, wait);
1158
1159 if (!list_empty(&file->events))
1160 mask = POLLIN | POLLRDNORM;
1161
1162 return mask;
1163 }
1164
1165 static int ib_ucm_open(struct inode *inode, struct file *filp)
1166 {
1167 struct ib_ucm_file *file;
1168
1169 file = kmalloc(sizeof(*file), GFP_KERNEL);
1170 if (!file)
1171 return -ENOMEM;
1172
1173 INIT_LIST_HEAD(&file->events);
1174 INIT_LIST_HEAD(&file->ctxs);
1175 init_waitqueue_head(&file->poll_wait);
1176
1177 mutex_init(&file->file_mutex);
1178
1179 filp->private_data = file;
1180 file->filp = filp;
1181 file->device = container_of(inode->i_cdev, struct ib_ucm_device, dev);
1182
1183 return 0;
1184 }
1185
1186 static int ib_ucm_close(struct inode *inode, struct file *filp)
1187 {
1188 struct ib_ucm_file *file = filp->private_data;
1189 struct ib_ucm_context *ctx;
1190
1191 mutex_lock(&file->file_mutex);
1192 while (!list_empty(&file->ctxs)) {
1193 ctx = list_entry(file->ctxs.next,
1194 struct ib_ucm_context, file_list);
1195 mutex_unlock(&file->file_mutex);
1196
1197 mutex_lock(&ctx_id_mutex);
1198 idr_remove(&ctx_id_table, ctx->id);
1199 mutex_unlock(&ctx_id_mutex);
1200
1201 ib_destroy_cm_id(ctx->cm_id);
1202 ib_ucm_cleanup_events(ctx);
1203 kfree(ctx);
1204
1205 mutex_lock(&file->file_mutex);
1206 }
1207 mutex_unlock(&file->file_mutex);
1208 kfree(file);
1209 return 0;
1210 }
1211
1212 static void ib_ucm_release_class_dev(struct class_device *class_dev)
1213 {
1214 struct ib_ucm_device *dev;
1215
1216 dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1217 cdev_del(&dev->dev);
1218 clear_bit(dev->devnum, dev_map);
1219 kfree(dev);
1220 }
1221
1222 static struct file_operations ucm_fops = {
1223 .owner = THIS_MODULE,
1224 .open = ib_ucm_open,
1225 .release = ib_ucm_close,
1226 .write = ib_ucm_write,
1227 .poll = ib_ucm_poll,
1228 };
1229
1230 static struct class ucm_class = {
1231 .name = "infiniband_cm",
1232 .release = ib_ucm_release_class_dev
1233 };
1234
1235 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1236 {
1237 struct ib_ucm_device *dev;
1238
1239 dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1240 return sprintf(buf, "%s\n", dev->ib_dev->name);
1241 }
1242 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1243
1244 static void ib_ucm_add_one(struct ib_device *device)
1245 {
1246 struct ib_ucm_device *ucm_dev;
1247
1248 if (!device->alloc_ucontext ||
1249 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1250 return;
1251
1252 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1253 if (!ucm_dev)
1254 return;
1255
1256 ucm_dev->ib_dev = device;
1257
1258 ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1259 if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
1260 goto err;
1261
1262 set_bit(ucm_dev->devnum, dev_map);
1263
1264 cdev_init(&ucm_dev->dev, &ucm_fops);
1265 ucm_dev->dev.owner = THIS_MODULE;
1266 kobject_set_name(&ucm_dev->dev.kobj, "ucm%d", ucm_dev->devnum);
1267 if (cdev_add(&ucm_dev->dev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
1268 goto err;
1269
1270 ucm_dev->class_dev.class = &ucm_class;
1271 ucm_dev->class_dev.dev = device->dma_device;
1272 ucm_dev->class_dev.devt = ucm_dev->dev.dev;
1273 snprintf(ucm_dev->class_dev.class_id, BUS_ID_SIZE, "ucm%d",
1274 ucm_dev->devnum);
1275 if (class_device_register(&ucm_dev->class_dev))
1276 goto err_cdev;
1277
1278 if (class_device_create_file(&ucm_dev->class_dev,
1279 &class_device_attr_ibdev))
1280 goto err_class;
1281
1282 ib_set_client_data(device, &ucm_client, ucm_dev);
1283 return;
1284
1285 err_class:
1286 class_device_unregister(&ucm_dev->class_dev);
1287 err_cdev:
1288 cdev_del(&ucm_dev->dev);
1289 clear_bit(ucm_dev->devnum, dev_map);
1290 err:
1291 kfree(ucm_dev);
1292 return;
1293 }
1294
1295 static void ib_ucm_remove_one(struct ib_device *device)
1296 {
1297 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1298
1299 if (!ucm_dev)
1300 return;
1301
1302 class_device_unregister(&ucm_dev->class_dev);
1303 }
1304
1305 static ssize_t show_abi_version(struct class *class, char *buf)
1306 {
1307 return sprintf(buf, "%d\n", IB_USER_CM_ABI_VERSION);
1308 }
1309 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1310
1311 static int __init ib_ucm_init(void)
1312 {
1313 int ret;
1314
1315 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1316 "infiniband_cm");
1317 if (ret) {
1318 printk(KERN_ERR "ucm: couldn't register device number\n");
1319 goto err;
1320 }
1321
1322 ret = class_register(&ucm_class);
1323 if (ret) {
1324 printk(KERN_ERR "ucm: couldn't create class infiniband_cm\n");
1325 goto err_chrdev;
1326 }
1327
1328 ret = class_create_file(&ucm_class, &class_attr_abi_version);
1329 if (ret) {
1330 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1331 goto err_class;
1332 }
1333
1334 ret = ib_register_client(&ucm_client);
1335 if (ret) {
1336 printk(KERN_ERR "ucm: couldn't register client\n");
1337 goto err_class;
1338 }
1339 return 0;
1340
1341 err_class:
1342 class_unregister(&ucm_class);
1343 err_chrdev:
1344 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1345 err:
1346 return ret;
1347 }
1348
1349 static void __exit ib_ucm_cleanup(void)
1350 {
1351 ib_unregister_client(&ucm_client);
1352 class_unregister(&ucm_class);
1353 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1354 idr_destroy(&ctx_id_table);
1355 }
1356
1357 module_init(ib_ucm_init);
1358 module_exit(ib_ucm_cleanup);
linux kernel for loongson