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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / infiniband / core / ucm.c
blob4291ab42a5b9c60fb78eeecdf09087b9af10f58b
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 /* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
110 extern struct class cm_class;
111
112 #define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
113
114 static void ib_ucm_add_one(struct ib_device *device);
115 static void ib_ucm_remove_one(struct ib_device *device);
116
117 static struct ib_client ucm_client = {
118 .name = "ucm",
119 .add = ib_ucm_add_one,
120 .remove = ib_ucm_remove_one
121 };
122
123 static DEFINE_MUTEX(ctx_id_mutex);
124 static DEFINE_IDR(ctx_id_table);
125 static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
126
127 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
128 {
129 struct ib_ucm_context *ctx;
130
131 mutex_lock(&ctx_id_mutex);
132 ctx = idr_find(&ctx_id_table, id);
133 if (!ctx)
134 ctx = ERR_PTR(-ENOENT);
135 else if (ctx->file != file)
136 ctx = ERR_PTR(-EINVAL);
137 else
138 atomic_inc(&ctx->ref);
139 mutex_unlock(&ctx_id_mutex);
140
141 return ctx;
142 }
143
144 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
145 {
146 if (atomic_dec_and_test(&ctx->ref))
147 complete(&ctx->comp);
148 }
149
150 static inline int ib_ucm_new_cm_id(int event)
151 {
152 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
153 }
154
155 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
156 {
157 struct ib_ucm_event *uevent;
158
159 mutex_lock(&ctx->file->file_mutex);
160 list_del(&ctx->file_list);
161 while (!list_empty(&ctx->events)) {
162
163 uevent = list_entry(ctx->events.next,
164 struct ib_ucm_event, ctx_list);
165 list_del(&uevent->file_list);
166 list_del(&uevent->ctx_list);
167 mutex_unlock(&ctx->file->file_mutex);
168
169 /* clear incoming connections. */
170 if (ib_ucm_new_cm_id(uevent->resp.event))
171 ib_destroy_cm_id(uevent->cm_id);
172
173 kfree(uevent);
174 mutex_lock(&ctx->file->file_mutex);
175 }
176 mutex_unlock(&ctx->file->file_mutex);
177 }
178
179 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
180 {
181 struct ib_ucm_context *ctx;
182 int result;
183
184 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
185 if (!ctx)
186 return NULL;
187
188 atomic_set(&ctx->ref, 1);
189 init_completion(&ctx->comp);
190 ctx->file = file;
191 INIT_LIST_HEAD(&ctx->events);
192
193 do {
194 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
195 if (!result)
196 goto error;
197
198 mutex_lock(&ctx_id_mutex);
199 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
200 mutex_unlock(&ctx_id_mutex);
201 } while (result == -EAGAIN);
202
203 if (result)
204 goto error;
205
206 list_add_tail(&ctx->file_list, &file->ctxs);
207 return ctx;
208
209 error:
210 kfree(ctx);
211 return NULL;
212 }
213
214 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
215 struct ib_cm_req_event_param *kreq)
216 {
217 ureq->remote_ca_guid = kreq->remote_ca_guid;
218 ureq->remote_qkey = kreq->remote_qkey;
219 ureq->remote_qpn = kreq->remote_qpn;
220 ureq->qp_type = kreq->qp_type;
221 ureq->starting_psn = kreq->starting_psn;
222 ureq->responder_resources = kreq->responder_resources;
223 ureq->initiator_depth = kreq->initiator_depth;
224 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
225 ureq->flow_control = kreq->flow_control;
226 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
227 ureq->retry_count = kreq->retry_count;
228 ureq->rnr_retry_count = kreq->rnr_retry_count;
229 ureq->srq = kreq->srq;
230 ureq->port = kreq->port;
231
232 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
233 if (kreq->alternate_path)
234 ib_copy_path_rec_to_user(&ureq->alternate_path,
235 kreq->alternate_path);
236 }
237
238 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
239 struct ib_cm_rep_event_param *krep)
240 {
241 urep->remote_ca_guid = krep->remote_ca_guid;
242 urep->remote_qkey = krep->remote_qkey;
243 urep->remote_qpn = krep->remote_qpn;
244 urep->starting_psn = krep->starting_psn;
245 urep->responder_resources = krep->responder_resources;
246 urep->initiator_depth = krep->initiator_depth;
247 urep->target_ack_delay = krep->target_ack_delay;
248 urep->failover_accepted = krep->failover_accepted;
249 urep->flow_control = krep->flow_control;
250 urep->rnr_retry_count = krep->rnr_retry_count;
251 urep->srq = krep->srq;
252 }
253
254 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
255 struct ib_cm_sidr_rep_event_param *krep)
256 {
257 urep->status = krep->status;
258 urep->qkey = krep->qkey;
259 urep->qpn = krep->qpn;
260 };
261
262 static int ib_ucm_event_process(struct ib_cm_event *evt,
263 struct ib_ucm_event *uvt)
264 {
265 void *info = NULL;
266
267 switch (evt->event) {
268 case IB_CM_REQ_RECEIVED:
269 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
270 &evt->param.req_rcvd);
271 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
272 uvt->resp.present = IB_UCM_PRES_PRIMARY;
273 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
274 IB_UCM_PRES_ALTERNATE : 0);
275 break;
276 case IB_CM_REP_RECEIVED:
277 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
278 &evt->param.rep_rcvd);
279 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
280 break;
281 case IB_CM_RTU_RECEIVED:
282 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
283 uvt->resp.u.send_status = evt->param.send_status;
284 break;
285 case IB_CM_DREQ_RECEIVED:
286 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
287 uvt->resp.u.send_status = evt->param.send_status;
288 break;
289 case IB_CM_DREP_RECEIVED:
290 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
291 uvt->resp.u.send_status = evt->param.send_status;
292 break;
293 case IB_CM_MRA_RECEIVED:
294 uvt->resp.u.mra_resp.timeout =
295 evt->param.mra_rcvd.service_timeout;
296 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
297 break;
298 case IB_CM_REJ_RECEIVED:
299 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
300 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
301 uvt->info_len = evt->param.rej_rcvd.ari_length;
302 info = evt->param.rej_rcvd.ari;
303 break;
304 case IB_CM_LAP_RECEIVED:
305 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
306 evt->param.lap_rcvd.alternate_path);
307 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
308 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
309 break;
310 case IB_CM_APR_RECEIVED:
311 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
312 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
313 uvt->info_len = evt->param.apr_rcvd.info_len;
314 info = evt->param.apr_rcvd.apr_info;
315 break;
316 case IB_CM_SIDR_REQ_RECEIVED:
317 uvt->resp.u.sidr_req_resp.pkey =
318 evt->param.sidr_req_rcvd.pkey;
319 uvt->resp.u.sidr_req_resp.port =
320 evt->param.sidr_req_rcvd.port;
321 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
322 break;
323 case IB_CM_SIDR_REP_RECEIVED:
324 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
325 &evt->param.sidr_rep_rcvd);
326 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
327 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
328 info = evt->param.sidr_rep_rcvd.info;
329 break;
330 default:
331 uvt->resp.u.send_status = evt->param.send_status;
332 break;
333 }
334
335 if (uvt->data_len) {
336 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
337 if (!uvt->data)
338 goto err1;
339
340 uvt->resp.present |= IB_UCM_PRES_DATA;
341 }
342
343 if (uvt->info_len) {
344 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
345 if (!uvt->info)
346 goto err2;
347
348 uvt->resp.present |= IB_UCM_PRES_INFO;
349 }
350 return 0;
351
352 err2:
353 kfree(uvt->data);
354 err1:
355 return -ENOMEM;
356 }
357
358 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
359 struct ib_cm_event *event)
360 {
361 struct ib_ucm_event *uevent;
362 struct ib_ucm_context *ctx;
363 int result = 0;
364
365 ctx = cm_id->context;
366
367 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
368 if (!uevent)
369 goto err1;
370
371 uevent->ctx = ctx;
372 uevent->cm_id = cm_id;
373 uevent->resp.uid = ctx->uid;
374 uevent->resp.id = ctx->id;
375 uevent->resp.event = event->event;
376
377 result = ib_ucm_event_process(event, uevent);
378 if (result)
379 goto err2;
380
381 mutex_lock(&ctx->file->file_mutex);
382 list_add_tail(&uevent->file_list, &ctx->file->events);
383 list_add_tail(&uevent->ctx_list, &ctx->events);
384 wake_up_interruptible(&ctx->file->poll_wait);
385 mutex_unlock(&ctx->file->file_mutex);
386 return 0;
387
388 err2:
389 kfree(uevent);
390 err1:
391 /* Destroy new cm_id's */
392 return ib_ucm_new_cm_id(event->event);
393 }
394
395 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
396 const char __user *inbuf,
397 int in_len, int out_len)
398 {
399 struct ib_ucm_context *ctx;
400 struct ib_ucm_event_get cmd;
401 struct ib_ucm_event *uevent;
402 int result = 0;
403 DEFINE_WAIT(wait);
404
405 if (out_len < sizeof(struct ib_ucm_event_resp))
406 return -ENOSPC;
407
408 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
409 return -EFAULT;
410
411 mutex_lock(&file->file_mutex);
412 while (list_empty(&file->events)) {
413 mutex_unlock(&file->file_mutex);
414
415 if (file->filp->f_flags & O_NONBLOCK)
416 return -EAGAIN;
417
418 if (wait_event_interruptible(file->poll_wait,
419 !list_empty(&file->events)))
420 return -ERESTARTSYS;
421
422 mutex_lock(&file->file_mutex);
423 }
424
425 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
426
427 if (ib_ucm_new_cm_id(uevent->resp.event)) {
428 ctx = ib_ucm_ctx_alloc(file);
429 if (!ctx) {
430 result = -ENOMEM;
431 goto done;
432 }
433
434 ctx->cm_id = uevent->cm_id;
435 ctx->cm_id->context = ctx;
436 uevent->resp.id = ctx->id;
437 }
438
439 if (copy_to_user((void __user *)(unsigned long)cmd.response,
440 &uevent->resp, sizeof(uevent->resp))) {
441 result = -EFAULT;
442 goto done;
443 }
444
445 if (uevent->data) {
446 if (cmd.data_len < uevent->data_len) {
447 result = -ENOMEM;
448 goto done;
449 }
450 if (copy_to_user((void __user *)(unsigned long)cmd.data,
451 uevent->data, uevent->data_len)) {
452 result = -EFAULT;
453 goto done;
454 }
455 }
456
457 if (uevent->info) {
458 if (cmd.info_len < uevent->info_len) {
459 result = -ENOMEM;
460 goto done;
461 }
462 if (copy_to_user((void __user *)(unsigned long)cmd.info,
463 uevent->info, uevent->info_len)) {
464 result = -EFAULT;
465 goto done;
466 }
467 }
468
469 list_del(&uevent->file_list);
470 list_del(&uevent->ctx_list);
471 uevent->ctx->events_reported++;
472
473 kfree(uevent->data);
474 kfree(uevent->info);
475 kfree(uevent);
476 done:
477 mutex_unlock(&file->file_mutex);
478 return result;
479 }
480
481 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
482 const char __user *inbuf,
483 int in_len, int out_len)
484 {
485 struct ib_ucm_create_id cmd;
486 struct ib_ucm_create_id_resp resp;
487 struct ib_ucm_context *ctx;
488 int result;
489
490 if (out_len < sizeof(resp))
491 return -ENOSPC;
492
493 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
494 return -EFAULT;
495
496 mutex_lock(&file->file_mutex);
497 ctx = ib_ucm_ctx_alloc(file);
498 mutex_unlock(&file->file_mutex);
499 if (!ctx)
500 return -ENOMEM;
501
502 ctx->uid = cmd.uid;
503 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
504 ib_ucm_event_handler, ctx);
505 if (IS_ERR(ctx->cm_id)) {
506 result = PTR_ERR(ctx->cm_id);
507 goto err1;
508 }
509
510 resp.id = ctx->id;
511 if (copy_to_user((void __user *)(unsigned long)cmd.response,
512 &resp, sizeof(resp))) {
513 result = -EFAULT;
514 goto err2;
515 }
516 return 0;
517
518 err2:
519 ib_destroy_cm_id(ctx->cm_id);
520 err1:
521 mutex_lock(&ctx_id_mutex);
522 idr_remove(&ctx_id_table, ctx->id);
523 mutex_unlock(&ctx_id_mutex);
524 kfree(ctx);
525 return result;
526 }
527
528 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
529 const char __user *inbuf,
530 int in_len, int out_len)
531 {
532 struct ib_ucm_destroy_id cmd;
533 struct ib_ucm_destroy_id_resp resp;
534 struct ib_ucm_context *ctx;
535 int result = 0;
536
537 if (out_len < sizeof(resp))
538 return -ENOSPC;
539
540 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
541 return -EFAULT;
542
543 mutex_lock(&ctx_id_mutex);
544 ctx = idr_find(&ctx_id_table, cmd.id);
545 if (!ctx)
546 ctx = ERR_PTR(-ENOENT);
547 else if (ctx->file != file)
548 ctx = ERR_PTR(-EINVAL);
549 else
550 idr_remove(&ctx_id_table, ctx->id);
551 mutex_unlock(&ctx_id_mutex);
552
553 if (IS_ERR(ctx))
554 return PTR_ERR(ctx);
555
556 ib_ucm_ctx_put(ctx);
557 wait_for_completion(&ctx->comp);
558
559 /* No new events will be generated after destroying the cm_id. */
560 ib_destroy_cm_id(ctx->cm_id);
561 /* Cleanup events not yet reported to the user. */
562 ib_ucm_cleanup_events(ctx);
563
564 resp.events_reported = ctx->events_reported;
565 if (copy_to_user((void __user *)(unsigned long)cmd.response,
566 &resp, sizeof(resp)))
567 result = -EFAULT;
568
569 kfree(ctx);
570 return result;
571 }
572
573 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
574 const char __user *inbuf,
575 int in_len, int out_len)
576 {
577 struct ib_ucm_attr_id_resp resp;
578 struct ib_ucm_attr_id cmd;
579 struct ib_ucm_context *ctx;
580 int result = 0;
581
582 if (out_len < sizeof(resp))
583 return -ENOSPC;
584
585 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
586 return -EFAULT;
587
588 ctx = ib_ucm_ctx_get(file, cmd.id);
589 if (IS_ERR(ctx))
590 return PTR_ERR(ctx);
591
592 resp.service_id = ctx->cm_id->service_id;
593 resp.service_mask = ctx->cm_id->service_mask;
594 resp.local_id = ctx->cm_id->local_id;
595 resp.remote_id = ctx->cm_id->remote_id;
596
597 if (copy_to_user((void __user *)(unsigned long)cmd.response,
598 &resp, sizeof(resp)))
599 result = -EFAULT;
600
601 ib_ucm_ctx_put(ctx);
602 return result;
603 }
604
605 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
606 const char __user *inbuf,
607 int in_len, int out_len)
608 {
609 struct ib_uverbs_qp_attr resp;
610 struct ib_ucm_init_qp_attr cmd;
611 struct ib_ucm_context *ctx;
612 struct ib_qp_attr qp_attr;
613 int result = 0;
614
615 if (out_len < sizeof(resp))
616 return -ENOSPC;
617
618 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
619 return -EFAULT;
620
621 ctx = ib_ucm_ctx_get(file, cmd.id);
622 if (IS_ERR(ctx))
623 return PTR_ERR(ctx);
624
625 resp.qp_attr_mask = 0;
626 memset(&qp_attr, 0, sizeof qp_attr);
627 qp_attr.qp_state = cmd.qp_state;
628 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
629 if (result)
630 goto out;
631
632 ib_copy_qp_attr_to_user(&resp, &qp_attr);
633
634 if (copy_to_user((void __user *)(unsigned long)cmd.response,
635 &resp, sizeof(resp)))
636 result = -EFAULT;
637
638 out:
639 ib_ucm_ctx_put(ctx);
640 return result;
641 }
642
643 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
644 {
645 service_id &= service_mask;
646
647 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
648 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
649 return -EINVAL;
650
651 return 0;
652 }
653
654 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
655 const char __user *inbuf,
656 int in_len, int out_len)
657 {
658 struct ib_ucm_listen cmd;
659 struct ib_ucm_context *ctx;
660 int result;
661
662 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
663 return -EFAULT;
664
665 ctx = ib_ucm_ctx_get(file, cmd.id);
666 if (IS_ERR(ctx))
667 return PTR_ERR(ctx);
668
669 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
670 if (result)
671 goto out;
672
673 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
674 NULL);
675 out:
676 ib_ucm_ctx_put(ctx);
677 return result;
678 }
679
680 static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
681 const char __user *inbuf,
682 int in_len, int out_len)
683 {
684 struct ib_ucm_notify cmd;
685 struct ib_ucm_context *ctx;
686 int result;
687
688 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
689 return -EFAULT;
690
691 ctx = ib_ucm_ctx_get(file, cmd.id);
692 if (IS_ERR(ctx))
693 return PTR_ERR(ctx);
694
695 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
696 ib_ucm_ctx_put(ctx);
697 return result;
698 }
699
700 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
701 {
702 void *data;
703
704 *dest = NULL;
705
706 if (!len)
707 return 0;
708
709 data = kmalloc(len, GFP_KERNEL);
710 if (!data)
711 return -ENOMEM;
712
713 if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
714 kfree(data);
715 return -EFAULT;
716 }
717
718 *dest = data;
719 return 0;
720 }
721
722 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
723 {
724 struct ib_user_path_rec upath;
725 struct ib_sa_path_rec *sa_path;
726
727 *path = NULL;
728
729 if (!src)
730 return 0;
731
732 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
733 if (!sa_path)
734 return -ENOMEM;
735
736 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
737 sizeof(upath))) {
738
739 kfree(sa_path);
740 return -EFAULT;
741 }
742
743 ib_copy_path_rec_from_user(sa_path, &upath);
744 *path = sa_path;
745 return 0;
746 }
747
748 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
749 const char __user *inbuf,
750 int in_len, int out_len)
751 {
752 struct ib_cm_req_param param;
753 struct ib_ucm_context *ctx;
754 struct ib_ucm_req cmd;
755 int result;
756
757 param.private_data = NULL;
758 param.primary_path = NULL;
759 param.alternate_path = NULL;
760
761 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
762 return -EFAULT;
763
764 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
765 if (result)
766 goto done;
767
768 result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
769 if (result)
770 goto done;
771
772 result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
773 if (result)
774 goto done;
775
776 param.private_data_len = cmd.len;
777 param.service_id = cmd.sid;
778 param.qp_num = cmd.qpn;
779 param.qp_type = cmd.qp_type;
780 param.starting_psn = cmd.psn;
781 param.peer_to_peer = cmd.peer_to_peer;
782 param.responder_resources = cmd.responder_resources;
783 param.initiator_depth = cmd.initiator_depth;
784 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
785 param.flow_control = cmd.flow_control;
786 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
787 param.retry_count = cmd.retry_count;
788 param.rnr_retry_count = cmd.rnr_retry_count;
789 param.max_cm_retries = cmd.max_cm_retries;
790 param.srq = cmd.srq;
791
792 ctx = ib_ucm_ctx_get(file, cmd.id);
793 if (!IS_ERR(ctx)) {
794 result = ib_send_cm_req(ctx->cm_id, &param);
795 ib_ucm_ctx_put(ctx);
796 } else
797 result = PTR_ERR(ctx);
798
799 done:
800 kfree(param.private_data);
801 kfree(param.primary_path);
802 kfree(param.alternate_path);
803 return result;
804 }
805
806 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
807 const char __user *inbuf,
808 int in_len, int out_len)
809 {
810 struct ib_cm_rep_param param;
811 struct ib_ucm_context *ctx;
812 struct ib_ucm_rep cmd;
813 int result;
814
815 param.private_data = NULL;
816
817 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
818 return -EFAULT;
819
820 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
821 if (result)
822 return result;
823
824 param.qp_num = cmd.qpn;
825 param.starting_psn = cmd.psn;
826 param.private_data_len = cmd.len;
827 param.responder_resources = cmd.responder_resources;
828 param.initiator_depth = cmd.initiator_depth;
829 param.failover_accepted = cmd.failover_accepted;
830 param.flow_control = cmd.flow_control;
831 param.rnr_retry_count = cmd.rnr_retry_count;
832 param.srq = cmd.srq;
833
834 ctx = ib_ucm_ctx_get(file, cmd.id);
835 if (!IS_ERR(ctx)) {
836 ctx->uid = cmd.uid;
837 result = ib_send_cm_rep(ctx->cm_id, &param);
838 ib_ucm_ctx_put(ctx);
839 } else
840 result = PTR_ERR(ctx);
841
842 kfree(param.private_data);
843 return result;
844 }
845
846 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
847 const char __user *inbuf, int in_len,
848 int (*func)(struct ib_cm_id *cm_id,
849 const void *private_data,
850 u8 private_data_len))
851 {
852 struct ib_ucm_private_data cmd;
853 struct ib_ucm_context *ctx;
854 const void *private_data = NULL;
855 int result;
856
857 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
858 return -EFAULT;
859
860 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
861 if (result)
862 return result;
863
864 ctx = ib_ucm_ctx_get(file, cmd.id);
865 if (!IS_ERR(ctx)) {
866 result = func(ctx->cm_id, private_data, cmd.len);
867 ib_ucm_ctx_put(ctx);
868 } else
869 result = PTR_ERR(ctx);
870
871 kfree(private_data);
872 return result;
873 }
874
875 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
876 const char __user *inbuf,
877 int in_len, int out_len)
878 {
879 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
880 }
881
882 static ssize_t ib_ucm_send_dreq(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_dreq);
887 }
888
889 static ssize_t ib_ucm_send_drep(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_drep);
894 }
895
896 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
897 const char __user *inbuf, int in_len,
898 int (*func)(struct ib_cm_id *cm_id,
899 int status,
900 const void *info,
901 u8 info_len,
902 const void *data,
903 u8 data_len))
904 {
905 struct ib_ucm_context *ctx;
906 struct ib_ucm_info cmd;
907 const void *data = NULL;
908 const void *info = NULL;
909 int result;
910
911 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
912 return -EFAULT;
913
914 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
915 if (result)
916 goto done;
917
918 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
919 if (result)
920 goto done;
921
922 ctx = ib_ucm_ctx_get(file, cmd.id);
923 if (!IS_ERR(ctx)) {
924 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
925 data, cmd.data_len);
926 ib_ucm_ctx_put(ctx);
927 } else
928 result = PTR_ERR(ctx);
929
930 done:
931 kfree(data);
932 kfree(info);
933 return result;
934 }
935
936 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
937 const char __user *inbuf,
938 int in_len, int out_len)
939 {
940 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
941 }
942
943 static ssize_t ib_ucm_send_apr(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_apr);
948 }
949
950 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
951 const char __user *inbuf,
952 int in_len, int out_len)
953 {
954 struct ib_ucm_context *ctx;
955 struct ib_ucm_mra cmd;
956 const void *data = NULL;
957 int result;
958
959 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
960 return -EFAULT;
961
962 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
963 if (result)
964 return result;
965
966 ctx = ib_ucm_ctx_get(file, cmd.id);
967 if (!IS_ERR(ctx)) {
968 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
969 ib_ucm_ctx_put(ctx);
970 } else
971 result = PTR_ERR(ctx);
972
973 kfree(data);
974 return result;
975 }
976
977 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
978 const char __user *inbuf,
979 int in_len, int out_len)
980 {
981 struct ib_ucm_context *ctx;
982 struct ib_sa_path_rec *path = NULL;
983 struct ib_ucm_lap cmd;
984 const void *data = NULL;
985 int result;
986
987 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
988 return -EFAULT;
989
990 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
991 if (result)
992 goto done;
993
994 result = ib_ucm_path_get(&path, cmd.path);
995 if (result)
996 goto done;
997
998 ctx = ib_ucm_ctx_get(file, cmd.id);
999 if (!IS_ERR(ctx)) {
1000 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
1001 ib_ucm_ctx_put(ctx);
1002 } else
1003 result = PTR_ERR(ctx);
1004
1005 done:
1006 kfree(data);
1007 kfree(path);
1008 return result;
1009 }
1010
1011 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1012 const char __user *inbuf,
1013 int in_len, int out_len)
1014 {
1015 struct ib_cm_sidr_req_param param;
1016 struct ib_ucm_context *ctx;
1017 struct ib_ucm_sidr_req cmd;
1018 int result;
1019
1020 param.private_data = NULL;
1021 param.path = NULL;
1022
1023 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1024 return -EFAULT;
1025
1026 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1027 if (result)
1028 goto done;
1029
1030 result = ib_ucm_path_get(&param.path, cmd.path);
1031 if (result)
1032 goto done;
1033
1034 param.private_data_len = cmd.len;
1035 param.service_id = cmd.sid;
1036 param.timeout_ms = cmd.timeout;
1037 param.max_cm_retries = cmd.max_cm_retries;
1038
1039 ctx = ib_ucm_ctx_get(file, cmd.id);
1040 if (!IS_ERR(ctx)) {
1041 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1042 ib_ucm_ctx_put(ctx);
1043 } else
1044 result = PTR_ERR(ctx);
1045
1046 done:
1047 kfree(param.private_data);
1048 kfree(param.path);
1049 return result;
1050 }
1051
1052 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1053 const char __user *inbuf,
1054 int in_len, int out_len)
1055 {
1056 struct ib_cm_sidr_rep_param param;
1057 struct ib_ucm_sidr_rep cmd;
1058 struct ib_ucm_context *ctx;
1059 int result;
1060
1061 param.info = NULL;
1062
1063 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1064 return -EFAULT;
1065
1066 result = ib_ucm_alloc_data(&param.private_data,
1067 cmd.data, cmd.data_len);
1068 if (result)
1069 goto done;
1070
1071 result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1072 if (result)
1073 goto done;
1074
1075 param.qp_num = cmd.qpn;
1076 param.qkey = cmd.qkey;
1077 param.status = cmd.status;
1078 param.info_length = cmd.info_len;
1079 param.private_data_len = cmd.data_len;
1080
1081 ctx = ib_ucm_ctx_get(file, cmd.id);
1082 if (!IS_ERR(ctx)) {
1083 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1084 ib_ucm_ctx_put(ctx);
1085 } else
1086 result = PTR_ERR(ctx);
1087
1088 done:
1089 kfree(param.private_data);
1090 kfree(param.info);
1091 return result;
1092 }
1093
1094 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1095 const char __user *inbuf,
1096 int in_len, int out_len) = {
1097 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1098 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1099 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1100 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1101 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1102 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1103 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1104 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1105 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1106 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1107 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1108 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1109 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1110 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1111 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1112 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1113 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1114 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1115 };
1116
1117 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1118 size_t len, loff_t *pos)
1119 {
1120 struct ib_ucm_file *file = filp->private_data;
1121 struct ib_ucm_cmd_hdr hdr;
1122 ssize_t result;
1123
1124 if (len < sizeof(hdr))
1125 return -EINVAL;
1126
1127 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1128 return -EFAULT;
1129
1130 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1131 return -EINVAL;
1132
1133 if (hdr.in + sizeof(hdr) > len)
1134 return -EINVAL;
1135
1136 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1137 hdr.in, hdr.out);
1138 if (!result)
1139 result = len;
1140
1141 return result;
1142 }
1143
1144 static unsigned int ib_ucm_poll(struct file *filp,
1145 struct poll_table_struct *wait)
1146 {
1147 struct ib_ucm_file *file = filp->private_data;
1148 unsigned int mask = 0;
1149
1150 poll_wait(filp, &file->poll_wait, wait);
1151
1152 if (!list_empty(&file->events))
1153 mask = POLLIN | POLLRDNORM;
1154
1155 return mask;
1156 }
1157
1158 static int ib_ucm_open(struct inode *inode, struct file *filp)
1159 {
1160 struct ib_ucm_file *file;
1161
1162 file = kmalloc(sizeof(*file), GFP_KERNEL);
1163 if (!file)
1164 return -ENOMEM;
1165
1166 INIT_LIST_HEAD(&file->events);
1167 INIT_LIST_HEAD(&file->ctxs);
1168 init_waitqueue_head(&file->poll_wait);
1169
1170 mutex_init(&file->file_mutex);
1171
1172 filp->private_data = file;
1173 file->filp = filp;
1174 file->device = container_of(inode->i_cdev, struct ib_ucm_device, dev);
1175
1176 return 0;
1177 }
1178
1179 static int ib_ucm_close(struct inode *inode, struct file *filp)
1180 {
1181 struct ib_ucm_file *file = filp->private_data;
1182 struct ib_ucm_context *ctx;
1183
1184 mutex_lock(&file->file_mutex);
1185 while (!list_empty(&file->ctxs)) {
1186 ctx = list_entry(file->ctxs.next,
1187 struct ib_ucm_context, file_list);
1188 mutex_unlock(&file->file_mutex);
1189
1190 mutex_lock(&ctx_id_mutex);
1191 idr_remove(&ctx_id_table, ctx->id);
1192 mutex_unlock(&ctx_id_mutex);
1193
1194 ib_destroy_cm_id(ctx->cm_id);
1195 ib_ucm_cleanup_events(ctx);
1196 kfree(ctx);
1197
1198 mutex_lock(&file->file_mutex);
1199 }
1200 mutex_unlock(&file->file_mutex);
1201 kfree(file);
1202 return 0;
1203 }
1204
1205 static void ucm_release_class_dev(struct class_device *class_dev)
1206 {
1207 struct ib_ucm_device *dev;
1208
1209 dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1210 cdev_del(&dev->dev);
1211 clear_bit(dev->devnum, dev_map);
1212 kfree(dev);
1213 }
1214
1215 static const struct file_operations ucm_fops = {
1216 .owner = THIS_MODULE,
1217 .open = ib_ucm_open,
1218 .release = ib_ucm_close,
1219 .write = ib_ucm_write,
1220 .poll = ib_ucm_poll,
1221 };
1222
1223 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1224 {
1225 struct ib_ucm_device *dev;
1226
1227 dev = container_of(class_dev, struct ib_ucm_device, class_dev);
1228 return sprintf(buf, "%s\n", dev->ib_dev->name);
1229 }
1230 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1231
1232 static void ib_ucm_add_one(struct ib_device *device)
1233 {
1234 struct ib_ucm_device *ucm_dev;
1235
1236 if (!device->alloc_ucontext ||
1237 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1238 return;
1239
1240 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1241 if (!ucm_dev)
1242 return;
1243
1244 ucm_dev->ib_dev = device;
1245
1246 ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1247 if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
1248 goto err;
1249
1250 set_bit(ucm_dev->devnum, dev_map);
1251
1252 cdev_init(&ucm_dev->dev, &ucm_fops);
1253 ucm_dev->dev.owner = THIS_MODULE;
1254 kobject_set_name(&ucm_dev->dev.kobj, "ucm%d", ucm_dev->devnum);
1255 if (cdev_add(&ucm_dev->dev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
1256 goto err;
1257
1258 ucm_dev->class_dev.class = &cm_class;
1259 ucm_dev->class_dev.dev = device->dma_device;
1260 ucm_dev->class_dev.devt = ucm_dev->dev.dev;
1261 ucm_dev->class_dev.release = ucm_release_class_dev;
1262 snprintf(ucm_dev->class_dev.class_id, BUS_ID_SIZE, "ucm%d",
1263 ucm_dev->devnum);
1264 if (class_device_register(&ucm_dev->class_dev))
1265 goto err_cdev;
1266
1267 if (class_device_create_file(&ucm_dev->class_dev,
1268 &class_device_attr_ibdev))
1269 goto err_class;
1270
1271 ib_set_client_data(device, &ucm_client, ucm_dev);
1272 return;
1273
1274 err_class:
1275 class_device_unregister(&ucm_dev->class_dev);
1276 err_cdev:
1277 cdev_del(&ucm_dev->dev);
1278 clear_bit(ucm_dev->devnum, dev_map);
1279 err:
1280 kfree(ucm_dev);
1281 return;
1282 }
1283
1284 static void ib_ucm_remove_one(struct ib_device *device)
1285 {
1286 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1287
1288 if (!ucm_dev)
1289 return;
1290
1291 class_device_unregister(&ucm_dev->class_dev);
1292 }
1293
1294 static ssize_t show_abi_version(struct class *class, char *buf)
1295 {
1296 return sprintf(buf, "%d\n", IB_USER_CM_ABI_VERSION);
1297 }
1298 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1299
1300 static int __init ib_ucm_init(void)
1301 {
1302 int ret;
1303
1304 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1305 "infiniband_cm");
1306 if (ret) {
1307 printk(KERN_ERR "ucm: couldn't register device number\n");
1308 goto error1;
1309 }
1310
1311 ret = class_create_file(&cm_class, &class_attr_abi_version);
1312 if (ret) {
1313 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1314 goto error2;
1315 }
1316
1317 ret = ib_register_client(&ucm_client);
1318 if (ret) {
1319 printk(KERN_ERR "ucm: couldn't register client\n");
1320 goto error3;
1321 }
1322 return 0;
1323
1324 error3:
1325 class_remove_file(&cm_class, &class_attr_abi_version);
1326 error2:
1327 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1328 error1:
1329 return ret;
1330 }
1331
1332 static void __exit ib_ucm_cleanup(void)
1333 {
1334 ib_unregister_client(&ucm_client);
1335 class_remove_file(&cm_class, &class_attr_abi_version);
1336 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1337 idr_destroy(&ctx_id_table);
1338 }
1339
1340 module_init(ib_ucm_init);
1341 module_exit(ib_ucm_cleanup);
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