projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
IB: common handling for marshalling parameters to/from userspace
[deliverable/linux.git] / drivers / infiniband / core / ucm.c
1 /*
2 * Copyright (c) 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 *
33 * $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 semaphore 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 down(&ctx->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 up(&ctx->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 = kmalloc(uvt->data_len, GFP_KERNEL);
332 if (!uvt->data)
333 goto err1;
334
335 memcpy(uvt->data, evt->private_data, uvt->data_len);
336 uvt->resp.present |= IB_UCM_PRES_DATA;
337 }
338
339 if (uvt->info_len) {
340 uvt->info = kmalloc(uvt->info_len, GFP_KERNEL);
341 if (!uvt->info)
342 goto err2;
343
344 memcpy(uvt->info, info, uvt->info_len);
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 down(&ctx->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 up(&ctx->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 down(&file->mutex);
409 while (list_empty(&file->events)) {
410
411 if (file->filp->f_flags & O_NONBLOCK) {
412 result = -EAGAIN;
413 break;
414 }
415
416 if (signal_pending(current)) {
417 result = -ERESTARTSYS;
418 break;
419 }
420
421 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
422
423 up(&file->mutex);
424 schedule();
425 down(&file->mutex);
426
427 finish_wait(&file->poll_wait, &wait);
428 }
429
430 if (result)
431 goto done;
432
433 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
434
435 if (ib_ucm_new_cm_id(uevent->resp.event)) {
436 ctx = ib_ucm_ctx_alloc(file);
437 if (!ctx) {
438 result = -ENOMEM;
439 goto done;
440 }
441
442 ctx->cm_id = uevent->cm_id;
443 ctx->cm_id->context = ctx;
444 uevent->resp.id = ctx->id;
445 }
446
447 if (copy_to_user((void __user *)(unsigned long)cmd.response,
448 &uevent->resp, sizeof(uevent->resp))) {
449 result = -EFAULT;
450 goto done;
451 }
452
453 if (uevent->data) {
454 if (cmd.data_len < uevent->data_len) {
455 result = -ENOMEM;
456 goto done;
457 }
458 if (copy_to_user((void __user *)(unsigned long)cmd.data,
459 uevent->data, uevent->data_len)) {
460 result = -EFAULT;
461 goto done;
462 }
463 }
464
465 if (uevent->info) {
466 if (cmd.info_len < uevent->info_len) {
467 result = -ENOMEM;
468 goto done;
469 }
470 if (copy_to_user((void __user *)(unsigned long)cmd.info,
471 uevent->info, uevent->info_len)) {
472 result = -EFAULT;
473 goto done;
474 }
475 }
476
477 list_del(&uevent->file_list);
478 list_del(&uevent->ctx_list);
479 uevent->ctx->events_reported++;
480
481 kfree(uevent->data);
482 kfree(uevent->info);
483 kfree(uevent);
484 done:
485 up(&file->mutex);
486 return result;
487 }
488
489 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
490 const char __user *inbuf,
491 int in_len, int out_len)
492 {
493 struct ib_ucm_create_id cmd;
494 struct ib_ucm_create_id_resp resp;
495 struct ib_ucm_context *ctx;
496 int result;
497
498 if (out_len < sizeof(resp))
499 return -ENOSPC;
500
501 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
502 return -EFAULT;
503
504 down(&file->mutex);
505 ctx = ib_ucm_ctx_alloc(file);
506 up(&file->mutex);
507 if (!ctx)
508 return -ENOMEM;
509
510 ctx->uid = cmd.uid;
511 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
512 ib_ucm_event_handler, ctx);
513 if (IS_ERR(ctx->cm_id)) {
514 result = PTR_ERR(ctx->cm_id);
515 goto err1;
516 }
517
518 resp.id = ctx->id;
519 if (copy_to_user((void __user *)(unsigned long)cmd.response,
520 &resp, sizeof(resp))) {
521 result = -EFAULT;
522 goto err2;
523 }
524 return 0;
525
526 err2:
527 ib_destroy_cm_id(ctx->cm_id);
528 err1:
529 mutex_lock(&ctx_id_mutex);
530 idr_remove(&ctx_id_table, ctx->id);
531 mutex_unlock(&ctx_id_mutex);
532 kfree(ctx);
533 return result;
534 }
535
536 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
537 const char __user *inbuf,
538 int in_len, int out_len)
539 {
540 struct ib_ucm_destroy_id cmd;
541 struct ib_ucm_destroy_id_resp resp;
542 struct ib_ucm_context *ctx;
543 int result = 0;
544
545 if (out_len < sizeof(resp))
546 return -ENOSPC;
547
548 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
549 return -EFAULT;
550
551 mutex_lock(&ctx_id_mutex);
552 ctx = idr_find(&ctx_id_table, cmd.id);
553 if (!ctx)
554 ctx = ERR_PTR(-ENOENT);
555 else if (ctx->file != file)
556 ctx = ERR_PTR(-EINVAL);
557 else
558 idr_remove(&ctx_id_table, ctx->id);
559 mutex_unlock(&ctx_id_mutex);
560
561 if (IS_ERR(ctx))
562 return PTR_ERR(ctx);
563
564 ib_ucm_ctx_put(ctx);
565 wait_for_completion(&ctx->comp);
566
567 /* No new events will be generated after destroying the cm_id. */
568 ib_destroy_cm_id(ctx->cm_id);
569 /* Cleanup events not yet reported to the user. */
570 ib_ucm_cleanup_events(ctx);
571
572 resp.events_reported = ctx->events_reported;
573 if (copy_to_user((void __user *)(unsigned long)cmd.response,
574 &resp, sizeof(resp)))
575 result = -EFAULT;
576
577 kfree(ctx);
578 return result;
579 }
580
581 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
582 const char __user *inbuf,
583 int in_len, int out_len)
584 {
585 struct ib_ucm_attr_id_resp resp;
586 struct ib_ucm_attr_id cmd;
587 struct ib_ucm_context *ctx;
588 int result = 0;
589
590 if (out_len < sizeof(resp))
591 return -ENOSPC;
592
593 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
594 return -EFAULT;
595
596 ctx = ib_ucm_ctx_get(file, cmd.id);
597 if (IS_ERR(ctx))
598 return PTR_ERR(ctx);
599
600 resp.service_id = ctx->cm_id->service_id;
601 resp.service_mask = ctx->cm_id->service_mask;
602 resp.local_id = ctx->cm_id->local_id;
603 resp.remote_id = ctx->cm_id->remote_id;
604
605 if (copy_to_user((void __user *)(unsigned long)cmd.response,
606 &resp, sizeof(resp)))
607 result = -EFAULT;
608
609 ib_ucm_ctx_put(ctx);
610 return result;
611 }
612
613 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
614 const char __user *inbuf,
615 int in_len, int out_len)
616 {
617 struct ib_uverbs_qp_attr resp;
618 struct ib_ucm_init_qp_attr cmd;
619 struct ib_ucm_context *ctx;
620 struct ib_qp_attr qp_attr;
621 int result = 0;
622
623 if (out_len < sizeof(resp))
624 return -ENOSPC;
625
626 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
627 return -EFAULT;
628
629 ctx = ib_ucm_ctx_get(file, cmd.id);
630 if (IS_ERR(ctx))
631 return PTR_ERR(ctx);
632
633 resp.qp_attr_mask = 0;
634 memset(&qp_attr, 0, sizeof qp_attr);
635 qp_attr.qp_state = cmd.qp_state;
636 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
637 if (result)
638 goto out;
639
640 ib_copy_qp_attr_to_user(&resp, &qp_attr);
641
642 if (copy_to_user((void __user *)(unsigned long)cmd.response,
643 &resp, sizeof(resp)))
644 result = -EFAULT;
645
646 out:
647 ib_ucm_ctx_put(ctx);
648 return result;
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 = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask);
667 ib_ucm_ctx_put(ctx);
668 return result;
669 }
670
671 static ssize_t ib_ucm_establish(struct ib_ucm_file *file,
672 const char __user *inbuf,
673 int in_len, int out_len)
674 {
675 struct ib_ucm_establish cmd;
676 struct ib_ucm_context *ctx;
677 int result;
678
679 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
680 return -EFAULT;
681
682 ctx = ib_ucm_ctx_get(file, cmd.id);
683 if (IS_ERR(ctx))
684 return PTR_ERR(ctx);
685
686 result = ib_cm_establish(ctx->cm_id);
687 ib_ucm_ctx_put(ctx);
688 return result;
689 }
690
691 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
692 {
693 void *data;
694
695 *dest = NULL;
696
697 if (!len)
698 return 0;
699
700 data = kmalloc(len, GFP_KERNEL);
701 if (!data)
702 return -ENOMEM;
703
704 if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
705 kfree(data);
706 return -EFAULT;
707 }
708
709 *dest = data;
710 return 0;
711 }
712
713 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
714 {
715 struct ib_user_path_rec upath;
716 struct ib_sa_path_rec *sa_path;
717
718 *path = NULL;
719
720 if (!src)
721 return 0;
722
723 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
724 if (!sa_path)
725 return -ENOMEM;
726
727 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
728 sizeof(upath))) {
729
730 kfree(sa_path);
731 return -EFAULT;
732 }
733
734 ib_copy_path_rec_from_user(sa_path, &upath);
735 *path = sa_path;
736 return 0;
737 }
738
739 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
740 const char __user *inbuf,
741 int in_len, int out_len)
742 {
743 struct ib_cm_req_param param;
744 struct ib_ucm_context *ctx;
745 struct ib_ucm_req cmd;
746 int result;
747
748 param.private_data = NULL;
749 param.primary_path = NULL;
750 param.alternate_path = NULL;
751
752 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
753 return -EFAULT;
754
755 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
756 if (result)
757 goto done;
758
759 result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
760 if (result)
761 goto done;
762
763 result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
764 if (result)
765 goto done;
766
767 param.private_data_len = cmd.len;
768 param.service_id = cmd.sid;
769 param.qp_num = cmd.qpn;
770 param.qp_type = cmd.qp_type;
771 param.starting_psn = cmd.psn;
772 param.peer_to_peer = cmd.peer_to_peer;
773 param.responder_resources = cmd.responder_resources;
774 param.initiator_depth = cmd.initiator_depth;
775 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
776 param.flow_control = cmd.flow_control;
777 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
778 param.retry_count = cmd.retry_count;
779 param.rnr_retry_count = cmd.rnr_retry_count;
780 param.max_cm_retries = cmd.max_cm_retries;
781 param.srq = cmd.srq;
782
783 ctx = ib_ucm_ctx_get(file, cmd.id);
784 if (!IS_ERR(ctx)) {
785 result = ib_send_cm_req(ctx->cm_id, &param);
786 ib_ucm_ctx_put(ctx);
787 } else
788 result = PTR_ERR(ctx);
789
790 done:
791 kfree(param.private_data);
792 kfree(param.primary_path);
793 kfree(param.alternate_path);
794 return result;
795 }
796
797 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
798 const char __user *inbuf,
799 int in_len, int out_len)
800 {
801 struct ib_cm_rep_param param;
802 struct ib_ucm_context *ctx;
803 struct ib_ucm_rep cmd;
804 int result;
805
806 param.private_data = NULL;
807
808 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
809 return -EFAULT;
810
811 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
812 if (result)
813 return result;
814
815 param.qp_num = cmd.qpn;
816 param.starting_psn = cmd.psn;
817 param.private_data_len = cmd.len;
818 param.responder_resources = cmd.responder_resources;
819 param.initiator_depth = cmd.initiator_depth;
820 param.target_ack_delay = cmd.target_ack_delay;
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 param.pkey = cmd.pkey;
1031
1032 ctx = ib_ucm_ctx_get(file, cmd.id);
1033 if (!IS_ERR(ctx)) {
1034 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1035 ib_ucm_ctx_put(ctx);
1036 } else
1037 result = PTR_ERR(ctx);
1038
1039 done:
1040 kfree(param.private_data);
1041 kfree(param.path);
1042 return result;
1043 }
1044
1045 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1046 const char __user *inbuf,
1047 int in_len, int out_len)
1048 {
1049 struct ib_cm_sidr_rep_param param;
1050 struct ib_ucm_sidr_rep cmd;
1051 struct ib_ucm_context *ctx;
1052 int result;
1053
1054 param.info = NULL;
1055
1056 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1057 return -EFAULT;
1058
1059 result = ib_ucm_alloc_data(&param.private_data,
1060 cmd.data, cmd.data_len);
1061 if (result)
1062 goto done;
1063
1064 result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1065 if (result)
1066 goto done;
1067
1068 param.qp_num = cmd.qpn;
1069 param.qkey = cmd.qkey;
1070 param.status = cmd.status;
1071 param.info_length = cmd.info_len;
1072 param.private_data_len = cmd.data_len;
1073
1074 ctx = ib_ucm_ctx_get(file, cmd.id);
1075 if (!IS_ERR(ctx)) {
1076 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1077 ib_ucm_ctx_put(ctx);
1078 } else
1079 result = PTR_ERR(ctx);
1080
1081 done:
1082 kfree(param.private_data);
1083 kfree(param.info);
1084 return result;
1085 }
1086
1087 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1088 const char __user *inbuf,
1089 int in_len, int out_len) = {
1090 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1091 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1092 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1093 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1094 [IB_USER_CM_CMD_ESTABLISH] = ib_ucm_establish,
1095 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1096 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1097 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1098 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1099 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1100 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1101 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1102 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1103 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1104 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1105 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1106 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1107 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1108 };
1109
1110 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1111 size_t len, loff_t *pos)
1112 {
1113 struct ib_ucm_file *file = filp->private_data;
1114 struct ib_ucm_cmd_hdr hdr;
1115 ssize_t result;
1116
1117 if (len < sizeof(hdr))
1118 return -EINVAL;
1119
1120 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1121 return -EFAULT;
1122
1123 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1124 return -EINVAL;
1125
1126 if (hdr.in + sizeof(hdr) > len)
1127 return -EINVAL;
1128
1129 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1130 hdr.in, hdr.out);
1131 if (!result)
1132 result = len;
1133
1134 return result;
1135 }
1136
1137 static unsigned int ib_ucm_poll(struct file *filp,
1138 struct poll_table_struct *wait)
1139 {
1140 struct ib_ucm_file *file = filp->private_data;
1141 unsigned int mask = 0;
1142
1143 poll_wait(filp, &file->poll_wait, wait);
1144
1145 if (!list_empty(&file->events))
1146 mask = POLLIN | POLLRDNORM;
1147
1148 return mask;
1149 }
1150
1151 static int ib_ucm_open(struct inode *inode, struct file *filp)
1152 {
1153 struct ib_ucm_file *file;
1154
1155 file = kmalloc(sizeof(*file), GFP_KERNEL);
1156 if (!file)
1157 return -ENOMEM;
1158
1159 INIT_LIST_HEAD(&file->events);
1160 INIT_LIST_HEAD(&file->ctxs);
1161 init_waitqueue_head(&file->poll_wait);
1162
1163 init_MUTEX(&file->mutex);
1164
1165 filp->private_data = file;
1166 file->filp = filp;
1167 file->device = container_of(inode->i_cdev, struct ib_ucm_device, dev);
1168
1169 return 0;
1170 }
1171
1172 static int ib_ucm_close(struct inode *inode, struct file *filp)
1173 {
1174 struct ib_ucm_file *file = filp->private_data;
1175 struct ib_ucm_context *ctx;
1176
1177 down(&file->mutex);
1178 while (!list_empty(&file->ctxs)) {
1179 ctx = list_entry(file->ctxs.next,
1180 struct ib_ucm_context, file_list);
1181 up(&file->mutex);
1182
1183 mutex_lock(&ctx_id_mutex);
1184 idr_remove(&ctx_id_table, ctx->id);
1185 mutex_unlock(&ctx_id_mutex);
1186
1187 ib_destroy_cm_id(ctx->cm_id);
1188 ib_ucm_cleanup_events(ctx);
1189 kfree(ctx);
1190
1191 down(&file->mutex);
1192 }
1193 up(&file->mutex);
1194 kfree(file);
1195 return 0;
1196 }
1197
1198 static void ib_ucm_release_class_dev(struct class_device *class_dev)
1199 {
1200 struct ib_ucm_device *dev;
1201
1202 dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1203 cdev_del(&dev->dev);
1204 clear_bit(dev->devnum, dev_map);
1205 kfree(dev);
1206 }
1207
1208 static struct file_operations ucm_fops = {
1209 .owner = THIS_MODULE,
1210 .open = ib_ucm_open,
1211 .release = ib_ucm_close,
1212 .write = ib_ucm_write,
1213 .poll = ib_ucm_poll,
1214 };
1215
1216 static struct class ucm_class = {
1217 .name = "infiniband_cm",
1218 .release = ib_ucm_release_class_dev
1219 };
1220
1221 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1222 {
1223 struct ib_ucm_device *dev;
1224
1225 dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1226 return sprintf(buf, "%s\n", dev->ib_dev->name);
1227 }
1228 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1229
1230 static void ib_ucm_add_one(struct ib_device *device)
1231 {
1232 struct ib_ucm_device *ucm_dev;
1233
1234 if (!device->alloc_ucontext)
1235 return;
1236
1237 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1238 if (!ucm_dev)
1239 return;
1240
1241 ucm_dev->ib_dev = device;
1242
1243 ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1244 if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
1245 goto err;
1246
1247 set_bit(ucm_dev->devnum, dev_map);
1248
1249 cdev_init(&ucm_dev->dev, &ucm_fops);
1250 ucm_dev->dev.owner = THIS_MODULE;
1251 kobject_set_name(&ucm_dev->dev.kobj, "ucm%d", ucm_dev->devnum);
1252 if (cdev_add(&ucm_dev->dev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
1253 goto err;
1254
1255 ucm_dev->class_dev.class = &ucm_class;
1256 ucm_dev->class_dev.dev = device->dma_device;
1257 ucm_dev->class_dev.devt = ucm_dev->dev.dev;
1258 snprintf(ucm_dev->class_dev.class_id, BUS_ID_SIZE, "ucm%d",
1259 ucm_dev->devnum);
1260 if (class_device_register(&ucm_dev->class_dev))
1261 goto err_cdev;
1262
1263 if (class_device_create_file(&ucm_dev->class_dev,
1264 &class_device_attr_ibdev))
1265 goto err_class;
1266
1267 ib_set_client_data(device, &ucm_client, ucm_dev);
1268 return;
1269
1270 err_class:
1271 class_device_unregister(&ucm_dev->class_dev);
1272 err_cdev:
1273 cdev_del(&ucm_dev->dev);
1274 clear_bit(ucm_dev->devnum, dev_map);
1275 err:
1276 kfree(ucm_dev);
1277 return;
1278 }
1279
1280 static void ib_ucm_remove_one(struct ib_device *device)
1281 {
1282 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1283
1284 if (!ucm_dev)
1285 return;
1286
1287 class_device_unregister(&ucm_dev->class_dev);
1288 }
1289
1290 static ssize_t show_abi_version(struct class *class, char *buf)
1291 {
1292 return sprintf(buf, "%d\n", IB_USER_CM_ABI_VERSION);
1293 }
1294 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1295
1296 static int __init ib_ucm_init(void)
1297 {
1298 int ret;
1299
1300 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1301 "infiniband_cm");
1302 if (ret) {
1303 printk(KERN_ERR "ucm: couldn't register device number\n");
1304 goto err;
1305 }
1306
1307 ret = class_register(&ucm_class);
1308 if (ret) {
1309 printk(KERN_ERR "ucm: couldn't create class infiniband_cm\n");
1310 goto err_chrdev;
1311 }
1312
1313 ret = class_create_file(&ucm_class, &class_attr_abi_version);
1314 if (ret) {
1315 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1316 goto err_class;
1317 }
1318
1319 ret = ib_register_client(&ucm_client);
1320 if (ret) {
1321 printk(KERN_ERR "ucm: couldn't register client\n");
1322 goto err_class;
1323 }
1324 return 0;
1325
1326 err_class:
1327 class_unregister(&ucm_class);
1328 err_chrdev:
1329 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1330 err:
1331 return ret;
1332 }
1333
1334 static void __exit ib_ucm_cleanup(void)
1335 {
1336 ib_unregister_client(&ucm_client);
1337 class_unregister(&ucm_class);
1338 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1339 idr_destroy(&ctx_id_table);
1340 }
1341
1342 module_init(ib_ucm_init);
1343 module_exit(ib_ucm_cleanup);
Linux kernel - Deliverables
This page took 0.101393 seconds and 6 git commands to generate.