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Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
[GitHub/mt8127/android_kernel_alcatel_ttab.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 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 = kmalloc(len, GFP_KERNEL);
707 if (!data)
708 return -ENOMEM;
709
710 if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
711 kfree(data);
712 return -EFAULT;
713 }
714
715 *dest = data;
716 return 0;
717 }
718
719 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
720 {
721 struct ib_user_path_rec upath;
722 struct ib_sa_path_rec *sa_path;
723
724 *path = NULL;
725
726 if (!src)
727 return 0;
728
729 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
730 if (!sa_path)
731 return -ENOMEM;
732
733 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
734 sizeof(upath))) {
735
736 kfree(sa_path);
737 return -EFAULT;
738 }
739
740 ib_copy_path_rec_from_user(sa_path, &upath);
741 *path = sa_path;
742 return 0;
743 }
744
745 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
746 const char __user *inbuf,
747 int in_len, int out_len)
748 {
749 struct ib_cm_req_param param;
750 struct ib_ucm_context *ctx;
751 struct ib_ucm_req cmd;
752 int result;
753
754 param.private_data = NULL;
755 param.primary_path = NULL;
756 param.alternate_path = NULL;
757
758 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
759 return -EFAULT;
760
761 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
762 if (result)
763 goto done;
764
765 result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
766 if (result)
767 goto done;
768
769 result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
770 if (result)
771 goto done;
772
773 param.private_data_len = cmd.len;
774 param.service_id = cmd.sid;
775 param.qp_num = cmd.qpn;
776 param.qp_type = cmd.qp_type;
777 param.starting_psn = cmd.psn;
778 param.peer_to_peer = cmd.peer_to_peer;
779 param.responder_resources = cmd.responder_resources;
780 param.initiator_depth = cmd.initiator_depth;
781 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
782 param.flow_control = cmd.flow_control;
783 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
784 param.retry_count = cmd.retry_count;
785 param.rnr_retry_count = cmd.rnr_retry_count;
786 param.max_cm_retries = cmd.max_cm_retries;
787 param.srq = cmd.srq;
788
789 ctx = ib_ucm_ctx_get(file, cmd.id);
790 if (!IS_ERR(ctx)) {
791 result = ib_send_cm_req(ctx->cm_id, &param);
792 ib_ucm_ctx_put(ctx);
793 } else
794 result = PTR_ERR(ctx);
795
796 done:
797 kfree(param.private_data);
798 kfree(param.primary_path);
799 kfree(param.alternate_path);
800 return result;
801 }
802
803 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
804 const char __user *inbuf,
805 int in_len, int out_len)
806 {
807 struct ib_cm_rep_param param;
808 struct ib_ucm_context *ctx;
809 struct ib_ucm_rep cmd;
810 int result;
811
812 param.private_data = NULL;
813
814 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
815 return -EFAULT;
816
817 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
818 if (result)
819 return result;
820
821 param.qp_num = cmd.qpn;
822 param.starting_psn = cmd.psn;
823 param.private_data_len = cmd.len;
824 param.responder_resources = cmd.responder_resources;
825 param.initiator_depth = cmd.initiator_depth;
826 param.failover_accepted = cmd.failover_accepted;
827 param.flow_control = cmd.flow_control;
828 param.rnr_retry_count = cmd.rnr_retry_count;
829 param.srq = cmd.srq;
830
831 ctx = ib_ucm_ctx_get(file, cmd.id);
832 if (!IS_ERR(ctx)) {
833 ctx->uid = cmd.uid;
834 result = ib_send_cm_rep(ctx->cm_id, &param);
835 ib_ucm_ctx_put(ctx);
836 } else
837 result = PTR_ERR(ctx);
838
839 kfree(param.private_data);
840 return result;
841 }
842
843 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
844 const char __user *inbuf, int in_len,
845 int (*func)(struct ib_cm_id *cm_id,
846 const void *private_data,
847 u8 private_data_len))
848 {
849 struct ib_ucm_private_data cmd;
850 struct ib_ucm_context *ctx;
851 const void *private_data = NULL;
852 int result;
853
854 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
855 return -EFAULT;
856
857 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
858 if (result)
859 return result;
860
861 ctx = ib_ucm_ctx_get(file, cmd.id);
862 if (!IS_ERR(ctx)) {
863 result = func(ctx->cm_id, private_data, cmd.len);
864 ib_ucm_ctx_put(ctx);
865 } else
866 result = PTR_ERR(ctx);
867
868 kfree(private_data);
869 return result;
870 }
871
872 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
873 const char __user *inbuf,
874 int in_len, int out_len)
875 {
876 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
877 }
878
879 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
880 const char __user *inbuf,
881 int in_len, int out_len)
882 {
883 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
884 }
885
886 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
887 const char __user *inbuf,
888 int in_len, int out_len)
889 {
890 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
891 }
892
893 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
894 const char __user *inbuf, int in_len,
895 int (*func)(struct ib_cm_id *cm_id,
896 int status,
897 const void *info,
898 u8 info_len,
899 const void *data,
900 u8 data_len))
901 {
902 struct ib_ucm_context *ctx;
903 struct ib_ucm_info cmd;
904 const void *data = NULL;
905 const void *info = NULL;
906 int result;
907
908 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
909 return -EFAULT;
910
911 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
912 if (result)
913 goto done;
914
915 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
916 if (result)
917 goto done;
918
919 ctx = ib_ucm_ctx_get(file, cmd.id);
920 if (!IS_ERR(ctx)) {
921 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
922 data, cmd.data_len);
923 ib_ucm_ctx_put(ctx);
924 } else
925 result = PTR_ERR(ctx);
926
927 done:
928 kfree(data);
929 kfree(info);
930 return result;
931 }
932
933 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
934 const char __user *inbuf,
935 int in_len, int out_len)
936 {
937 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
938 }
939
940 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
941 const char __user *inbuf,
942 int in_len, int out_len)
943 {
944 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
945 }
946
947 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
948 const char __user *inbuf,
949 int in_len, int out_len)
950 {
951 struct ib_ucm_context *ctx;
952 struct ib_ucm_mra cmd;
953 const void *data = NULL;
954 int result;
955
956 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
957 return -EFAULT;
958
959 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
960 if (result)
961 return result;
962
963 ctx = ib_ucm_ctx_get(file, cmd.id);
964 if (!IS_ERR(ctx)) {
965 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
966 ib_ucm_ctx_put(ctx);
967 } else
968 result = PTR_ERR(ctx);
969
970 kfree(data);
971 return result;
972 }
973
974 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
975 const char __user *inbuf,
976 int in_len, int out_len)
977 {
978 struct ib_ucm_context *ctx;
979 struct ib_sa_path_rec *path = NULL;
980 struct ib_ucm_lap cmd;
981 const void *data = NULL;
982 int result;
983
984 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
985 return -EFAULT;
986
987 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
988 if (result)
989 goto done;
990
991 result = ib_ucm_path_get(&path, cmd.path);
992 if (result)
993 goto done;
994
995 ctx = ib_ucm_ctx_get(file, cmd.id);
996 if (!IS_ERR(ctx)) {
997 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
998 ib_ucm_ctx_put(ctx);
999 } else
1000 result = PTR_ERR(ctx);
1001
1002 done:
1003 kfree(data);
1004 kfree(path);
1005 return result;
1006 }
1007
1008 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1009 const char __user *inbuf,
1010 int in_len, int out_len)
1011 {
1012 struct ib_cm_sidr_req_param param;
1013 struct ib_ucm_context *ctx;
1014 struct ib_ucm_sidr_req cmd;
1015 int result;
1016
1017 param.private_data = NULL;
1018 param.path = NULL;
1019
1020 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1021 return -EFAULT;
1022
1023 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1024 if (result)
1025 goto done;
1026
1027 result = ib_ucm_path_get(&param.path, cmd.path);
1028 if (result)
1029 goto done;
1030
1031 param.private_data_len = cmd.len;
1032 param.service_id = cmd.sid;
1033 param.timeout_ms = cmd.timeout;
1034 param.max_cm_retries = cmd.max_cm_retries;
1035
1036 ctx = ib_ucm_ctx_get(file, cmd.id);
1037 if (!IS_ERR(ctx)) {
1038 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1039 ib_ucm_ctx_put(ctx);
1040 } else
1041 result = PTR_ERR(ctx);
1042
1043 done:
1044 kfree(param.private_data);
1045 kfree(param.path);
1046 return result;
1047 }
1048
1049 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1050 const char __user *inbuf,
1051 int in_len, int out_len)
1052 {
1053 struct ib_cm_sidr_rep_param param;
1054 struct ib_ucm_sidr_rep cmd;
1055 struct ib_ucm_context *ctx;
1056 int result;
1057
1058 param.info = NULL;
1059
1060 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1061 return -EFAULT;
1062
1063 result = ib_ucm_alloc_data(&param.private_data,
1064 cmd.data, cmd.data_len);
1065 if (result)
1066 goto done;
1067
1068 result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1069 if (result)
1070 goto done;
1071
1072 param.qp_num = cmd.qpn;
1073 param.qkey = cmd.qkey;
1074 param.status = cmd.status;
1075 param.info_length = cmd.info_len;
1076 param.private_data_len = cmd.data_len;
1077
1078 ctx = ib_ucm_ctx_get(file, cmd.id);
1079 if (!IS_ERR(ctx)) {
1080 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1081 ib_ucm_ctx_put(ctx);
1082 } else
1083 result = PTR_ERR(ctx);
1084
1085 done:
1086 kfree(param.private_data);
1087 kfree(param.info);
1088 return result;
1089 }
1090
1091 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1092 const char __user *inbuf,
1093 int in_len, int out_len) = {
1094 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1095 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1096 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1097 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1098 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1099 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1100 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1101 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1102 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1103 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1104 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1105 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1106 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1107 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1108 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1109 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1110 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1111 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1112 };
1113
1114 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1115 size_t len, loff_t *pos)
1116 {
1117 struct ib_ucm_file *file = filp->private_data;
1118 struct ib_ucm_cmd_hdr hdr;
1119 ssize_t result;
1120
1121 if (len < sizeof(hdr))
1122 return -EINVAL;
1123
1124 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1125 return -EFAULT;
1126
1127 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1128 return -EINVAL;
1129
1130 if (hdr.in + sizeof(hdr) > len)
1131 return -EINVAL;
1132
1133 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1134 hdr.in, hdr.out);
1135 if (!result)
1136 result = len;
1137
1138 return result;
1139 }
1140
1141 static unsigned int ib_ucm_poll(struct file *filp,
1142 struct poll_table_struct *wait)
1143 {
1144 struct ib_ucm_file *file = filp->private_data;
1145 unsigned int mask = 0;
1146
1147 poll_wait(filp, &file->poll_wait, wait);
1148
1149 if (!list_empty(&file->events))
1150 mask = POLLIN | POLLRDNORM;
1151
1152 return mask;
1153 }
1154
1155 static int ib_ucm_open(struct inode *inode, struct file *filp)
1156 {
1157 struct ib_ucm_file *file;
1158
1159 file = kmalloc(sizeof(*file), GFP_KERNEL);
1160 if (!file)
1161 return -ENOMEM;
1162
1163 INIT_LIST_HEAD(&file->events);
1164 INIT_LIST_HEAD(&file->ctxs);
1165 init_waitqueue_head(&file->poll_wait);
1166
1167 mutex_init(&file->file_mutex);
1168
1169 filp->private_data = file;
1170 file->filp = filp;
1171 file->device = container_of(inode->i_cdev, struct ib_ucm_device, dev);
1172
1173 return 0;
1174 }
1175
1176 static int ib_ucm_close(struct inode *inode, struct file *filp)
1177 {
1178 struct ib_ucm_file *file = filp->private_data;
1179 struct ib_ucm_context *ctx;
1180
1181 mutex_lock(&file->file_mutex);
1182 while (!list_empty(&file->ctxs)) {
1183 ctx = list_entry(file->ctxs.next,
1184 struct ib_ucm_context, file_list);
1185 mutex_unlock(&file->file_mutex);
1186
1187 mutex_lock(&ctx_id_mutex);
1188 idr_remove(&ctx_id_table, ctx->id);
1189 mutex_unlock(&ctx_id_mutex);
1190
1191 ib_destroy_cm_id(ctx->cm_id);
1192 ib_ucm_cleanup_events(ctx);
1193 kfree(ctx);
1194
1195 mutex_lock(&file->file_mutex);
1196 }
1197 mutex_unlock(&file->file_mutex);
1198 kfree(file);
1199 return 0;
1200 }
1201
1202 static void ib_ucm_release_class_dev(struct class_device *class_dev)
1203 {
1204 struct ib_ucm_device *dev;
1205
1206 dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1207 cdev_del(&dev->dev);
1208 clear_bit(dev->devnum, dev_map);
1209 kfree(dev);
1210 }
1211
1212 static const struct file_operations ucm_fops = {
1213 .owner = THIS_MODULE,
1214 .open = ib_ucm_open,
1215 .release = ib_ucm_close,
1216 .write = ib_ucm_write,
1217 .poll = ib_ucm_poll,
1218 };
1219
1220 static struct class ucm_class = {
1221 .name = "infiniband_cm",
1222 .release = ib_ucm_release_class_dev
1223 };
1224
1225 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1226 {
1227 struct ib_ucm_device *dev;
1228
1229 dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1230 return sprintf(buf, "%s\n", dev->ib_dev->name);
1231 }
1232 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1233
1234 static void ib_ucm_add_one(struct ib_device *device)
1235 {
1236 struct ib_ucm_device *ucm_dev;
1237
1238 if (!device->alloc_ucontext ||
1239 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1240 return;
1241
1242 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1243 if (!ucm_dev)
1244 return;
1245
1246 ucm_dev->ib_dev = device;
1247
1248 ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1249 if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
1250 goto err;
1251
1252 set_bit(ucm_dev->devnum, dev_map);
1253
1254 cdev_init(&ucm_dev->dev, &ucm_fops);
1255 ucm_dev->dev.owner = THIS_MODULE;
1256 kobject_set_name(&ucm_dev->dev.kobj, "ucm%d", ucm_dev->devnum);
1257 if (cdev_add(&ucm_dev->dev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
1258 goto err;
1259
1260 ucm_dev->class_dev.class = &ucm_class;
1261 ucm_dev->class_dev.dev = device->dma_device;
1262 ucm_dev->class_dev.devt = ucm_dev->dev.dev;
1263 snprintf(ucm_dev->class_dev.class_id, BUS_ID_SIZE, "ucm%d",
1264 ucm_dev->devnum);
1265 if (class_device_register(&ucm_dev->class_dev))
1266 goto err_cdev;
1267
1268 if (class_device_create_file(&ucm_dev->class_dev,
1269 &class_device_attr_ibdev))
1270 goto err_class;
1271
1272 ib_set_client_data(device, &ucm_client, ucm_dev);
1273 return;
1274
1275 err_class:
1276 class_device_unregister(&ucm_dev->class_dev);
1277 err_cdev:
1278 cdev_del(&ucm_dev->dev);
1279 clear_bit(ucm_dev->devnum, dev_map);
1280 err:
1281 kfree(ucm_dev);
1282 return;
1283 }
1284
1285 static void ib_ucm_remove_one(struct ib_device *device)
1286 {
1287 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1288
1289 if (!ucm_dev)
1290 return;
1291
1292 class_device_unregister(&ucm_dev->class_dev);
1293 }
1294
1295 static ssize_t show_abi_version(struct class *class, char *buf)
1296 {
1297 return sprintf(buf, "%d\n", IB_USER_CM_ABI_VERSION);
1298 }
1299 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1300
1301 static int __init ib_ucm_init(void)
1302 {
1303 int ret;
1304
1305 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1306 "infiniband_cm");
1307 if (ret) {
1308 printk(KERN_ERR "ucm: couldn't register device number\n");
1309 goto err;
1310 }
1311
1312 ret = class_register(&ucm_class);
1313 if (ret) {
1314 printk(KERN_ERR "ucm: couldn't create class infiniband_cm\n");
1315 goto err_chrdev;
1316 }
1317
1318 ret = class_create_file(&ucm_class, &class_attr_abi_version);
1319 if (ret) {
1320 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1321 goto err_class;
1322 }
1323
1324 ret = ib_register_client(&ucm_client);
1325 if (ret) {
1326 printk(KERN_ERR "ucm: couldn't register client\n");
1327 goto err_class;
1328 }
1329 return 0;
1330
1331 err_class:
1332 class_unregister(&ucm_class);
1333 err_chrdev:
1334 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1335 err:
1336 return ret;
1337 }
1338
1339 static void __exit ib_ucm_cleanup(void)
1340 {
1341 ib_unregister_client(&ucm_client);
1342 class_unregister(&ucm_class);
1343 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1344 idr_destroy(&ctx_id_table);
1345 }
1346
1347 module_init(ib_ucm_init);
1348 module_exit(ib_ucm_cleanup);
kernel source for telekom puls (alcatel/mediatek)