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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / drivers / infiniband / core / ucm.c
blobf504c9b00c1ba631cbe7f27b80ad0859ab9f3a08
1 /*
2 * Copyright (c) 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <linux/completion.h>
35 #include <linux/init.h>
36 #include <linux/fs.h>
37 #include <linux/module.h>
38 #include <linux/device.h>
39 #include <linux/err.h>
40 #include <linux/poll.h>
41 #include <linux/sched.h>
42 #include <linux/file.h>
43 #include <linux/mount.h>
44 #include <linux/cdev.h>
45 #include <linux/idr.h>
46 #include <linux/mutex.h>
47
48 #include <asm/uaccess.h>
49
50 #include <rdma/ib_cm.h>
51 #include <rdma/ib_user_cm.h>
52 #include <rdma/ib_marshall.h>
53
54 MODULE_AUTHOR("Libor Michalek");
55 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
56 MODULE_LICENSE("Dual BSD/GPL");
57
58 struct ib_ucm_device {
59 int devnum;
60 struct cdev cdev;
61 struct device dev;
62 struct ib_device *ib_dev;
63 };
64
65 struct ib_ucm_file {
66 struct mutex file_mutex;
67 struct file *filp;
68 struct ib_ucm_device *device;
69
70 struct list_head ctxs;
71 struct list_head events;
72 wait_queue_head_t poll_wait;
73 };
74
75 struct ib_ucm_context {
76 int id;
77 struct completion comp;
78 atomic_t ref;
79 int events_reported;
80
81 struct ib_ucm_file *file;
82 struct ib_cm_id *cm_id;
83 __u64 uid;
84
85 struct list_head events; /* list of pending events. */
86 struct list_head file_list; /* member in file ctx list */
87 };
88
89 struct ib_ucm_event {
90 struct ib_ucm_context *ctx;
91 struct list_head file_list; /* member in file event list */
92 struct list_head ctx_list; /* member in ctx event list */
93
94 struct ib_cm_id *cm_id;
95 struct ib_ucm_event_resp resp;
96 void *data;
97 void *info;
98 int data_len;
99 int info_len;
100 };
101
102 enum {
103 IB_UCM_MAJOR = 231,
104 IB_UCM_BASE_MINOR = 224,
105 IB_UCM_MAX_DEVICES = 32
106 };
107
108 /* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
109 extern struct class cm_class;
110
111 #define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
112
113 static void ib_ucm_add_one(struct ib_device *device);
114 static void ib_ucm_remove_one(struct ib_device *device);
115
116 static struct ib_client ucm_client = {
117 .name = "ucm",
118 .add = ib_ucm_add_one,
119 .remove = ib_ucm_remove_one
120 };
121
122 static DEFINE_MUTEX(ctx_id_mutex);
123 static DEFINE_IDR(ctx_id_table);
124 static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
125
126 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
127 {
128 struct ib_ucm_context *ctx;
129
130 mutex_lock(&ctx_id_mutex);
131 ctx = idr_find(&ctx_id_table, id);
132 if (!ctx)
133 ctx = ERR_PTR(-ENOENT);
134 else if (ctx->file != file)
135 ctx = ERR_PTR(-EINVAL);
136 else
137 atomic_inc(&ctx->ref);
138 mutex_unlock(&ctx_id_mutex);
139
140 return ctx;
141 }
142
143 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
144 {
145 if (atomic_dec_and_test(&ctx->ref))
146 complete(&ctx->comp);
147 }
148
149 static inline int ib_ucm_new_cm_id(int event)
150 {
151 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
152 }
153
154 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
155 {
156 struct ib_ucm_event *uevent;
157
158 mutex_lock(&ctx->file->file_mutex);
159 list_del(&ctx->file_list);
160 while (!list_empty(&ctx->events)) {
161
162 uevent = list_entry(ctx->events.next,
163 struct ib_ucm_event, ctx_list);
164 list_del(&uevent->file_list);
165 list_del(&uevent->ctx_list);
166 mutex_unlock(&ctx->file->file_mutex);
167
168 /* clear incoming connections. */
169 if (ib_ucm_new_cm_id(uevent->resp.event))
170 ib_destroy_cm_id(uevent->cm_id);
171
172 kfree(uevent);
173 mutex_lock(&ctx->file->file_mutex);
174 }
175 mutex_unlock(&ctx->file->file_mutex);
176 }
177
178 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
179 {
180 struct ib_ucm_context *ctx;
181 int result;
182
183 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
184 if (!ctx)
185 return NULL;
186
187 atomic_set(&ctx->ref, 1);
188 init_completion(&ctx->comp);
189 ctx->file = file;
190 INIT_LIST_HEAD(&ctx->events);
191
192 do {
193 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
194 if (!result)
195 goto error;
196
197 mutex_lock(&ctx_id_mutex);
198 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
199 mutex_unlock(&ctx_id_mutex);
200 } while (result == -EAGAIN);
201
202 if (result)
203 goto error;
204
205 list_add_tail(&ctx->file_list, &file->ctxs);
206 return ctx;
207
208 error:
209 kfree(ctx);
210 return NULL;
211 }
212
213 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
214 struct ib_cm_req_event_param *kreq)
215 {
216 ureq->remote_ca_guid = kreq->remote_ca_guid;
217 ureq->remote_qkey = kreq->remote_qkey;
218 ureq->remote_qpn = kreq->remote_qpn;
219 ureq->qp_type = kreq->qp_type;
220 ureq->starting_psn = kreq->starting_psn;
221 ureq->responder_resources = kreq->responder_resources;
222 ureq->initiator_depth = kreq->initiator_depth;
223 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
224 ureq->flow_control = kreq->flow_control;
225 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
226 ureq->retry_count = kreq->retry_count;
227 ureq->rnr_retry_count = kreq->rnr_retry_count;
228 ureq->srq = kreq->srq;
229 ureq->port = kreq->port;
230
231 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
232 if (kreq->alternate_path)
233 ib_copy_path_rec_to_user(&ureq->alternate_path,
234 kreq->alternate_path);
235 }
236
237 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
238 struct ib_cm_rep_event_param *krep)
239 {
240 urep->remote_ca_guid = krep->remote_ca_guid;
241 urep->remote_qkey = krep->remote_qkey;
242 urep->remote_qpn = krep->remote_qpn;
243 urep->starting_psn = krep->starting_psn;
244 urep->responder_resources = krep->responder_resources;
245 urep->initiator_depth = krep->initiator_depth;
246 urep->target_ack_delay = krep->target_ack_delay;
247 urep->failover_accepted = krep->failover_accepted;
248 urep->flow_control = krep->flow_control;
249 urep->rnr_retry_count = krep->rnr_retry_count;
250 urep->srq = krep->srq;
251 }
252
253 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
254 struct ib_cm_sidr_rep_event_param *krep)
255 {
256 urep->status = krep->status;
257 urep->qkey = krep->qkey;
258 urep->qpn = krep->qpn;
259 };
260
261 static int ib_ucm_event_process(struct ib_cm_event *evt,
262 struct ib_ucm_event *uvt)
263 {
264 void *info = NULL;
265
266 switch (evt->event) {
267 case IB_CM_REQ_RECEIVED:
268 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
269 &evt->param.req_rcvd);
270 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
271 uvt->resp.present = IB_UCM_PRES_PRIMARY;
272 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
273 IB_UCM_PRES_ALTERNATE : 0);
274 break;
275 case IB_CM_REP_RECEIVED:
276 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
277 &evt->param.rep_rcvd);
278 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
279 break;
280 case IB_CM_RTU_RECEIVED:
281 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
282 uvt->resp.u.send_status = evt->param.send_status;
283 break;
284 case IB_CM_DREQ_RECEIVED:
285 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
286 uvt->resp.u.send_status = evt->param.send_status;
287 break;
288 case IB_CM_DREP_RECEIVED:
289 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
290 uvt->resp.u.send_status = evt->param.send_status;
291 break;
292 case IB_CM_MRA_RECEIVED:
293 uvt->resp.u.mra_resp.timeout =
294 evt->param.mra_rcvd.service_timeout;
295 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
296 break;
297 case IB_CM_REJ_RECEIVED:
298 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
299 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
300 uvt->info_len = evt->param.rej_rcvd.ari_length;
301 info = evt->param.rej_rcvd.ari;
302 break;
303 case IB_CM_LAP_RECEIVED:
304 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
305 evt->param.lap_rcvd.alternate_path);
306 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
307 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
308 break;
309 case IB_CM_APR_RECEIVED:
310 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
311 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
312 uvt->info_len = evt->param.apr_rcvd.info_len;
313 info = evt->param.apr_rcvd.apr_info;
314 break;
315 case IB_CM_SIDR_REQ_RECEIVED:
316 uvt->resp.u.sidr_req_resp.pkey =
317 evt->param.sidr_req_rcvd.pkey;
318 uvt->resp.u.sidr_req_resp.port =
319 evt->param.sidr_req_rcvd.port;
320 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
321 break;
322 case IB_CM_SIDR_REP_RECEIVED:
323 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
324 &evt->param.sidr_rep_rcvd);
325 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
326 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
327 info = evt->param.sidr_rep_rcvd.info;
328 break;
329 default:
330 uvt->resp.u.send_status = evt->param.send_status;
331 break;
332 }
333
334 if (uvt->data_len) {
335 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
336 if (!uvt->data)
337 goto err1;
338
339 uvt->resp.present |= IB_UCM_PRES_DATA;
340 }
341
342 if (uvt->info_len) {
343 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
344 if (!uvt->info)
345 goto err2;
346
347 uvt->resp.present |= IB_UCM_PRES_INFO;
348 }
349 return 0;
350
351 err2:
352 kfree(uvt->data);
353 err1:
354 return -ENOMEM;
355 }
356
357 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
358 struct ib_cm_event *event)
359 {
360 struct ib_ucm_event *uevent;
361 struct ib_ucm_context *ctx;
362 int result = 0;
363
364 ctx = cm_id->context;
365
366 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
367 if (!uevent)
368 goto err1;
369
370 uevent->ctx = ctx;
371 uevent->cm_id = cm_id;
372 uevent->resp.uid = ctx->uid;
373 uevent->resp.id = ctx->id;
374 uevent->resp.event = event->event;
375
376 result = ib_ucm_event_process(event, uevent);
377 if (result)
378 goto err2;
379
380 mutex_lock(&ctx->file->file_mutex);
381 list_add_tail(&uevent->file_list, &ctx->file->events);
382 list_add_tail(&uevent->ctx_list, &ctx->events);
383 wake_up_interruptible(&ctx->file->poll_wait);
384 mutex_unlock(&ctx->file->file_mutex);
385 return 0;
386
387 err2:
388 kfree(uevent);
389 err1:
390 /* Destroy new cm_id's */
391 return ib_ucm_new_cm_id(event->event);
392 }
393
394 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
395 const char __user *inbuf,
396 int in_len, int out_len)
397 {
398 struct ib_ucm_context *ctx;
399 struct ib_ucm_event_get cmd;
400 struct ib_ucm_event *uevent;
401 int result = 0;
402 DEFINE_WAIT(wait);
403
404 if (out_len < sizeof(struct ib_ucm_event_resp))
405 return -ENOSPC;
406
407 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
408 return -EFAULT;
409
410 mutex_lock(&file->file_mutex);
411 while (list_empty(&file->events)) {
412 mutex_unlock(&file->file_mutex);
413
414 if (file->filp->f_flags & O_NONBLOCK)
415 return -EAGAIN;
416
417 if (wait_event_interruptible(file->poll_wait,
418 !list_empty(&file->events)))
419 return -ERESTARTSYS;
420
421 mutex_lock(&file->file_mutex);
422 }
423
424 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
425
426 if (ib_ucm_new_cm_id(uevent->resp.event)) {
427 ctx = ib_ucm_ctx_alloc(file);
428 if (!ctx) {
429 result = -ENOMEM;
430 goto done;
431 }
432
433 ctx->cm_id = uevent->cm_id;
434 ctx->cm_id->context = ctx;
435 uevent->resp.id = ctx->id;
436 }
437
438 if (copy_to_user((void __user *)(unsigned long)cmd.response,
439 &uevent->resp, sizeof(uevent->resp))) {
440 result = -EFAULT;
441 goto done;
442 }
443
444 if (uevent->data) {
445 if (cmd.data_len < uevent->data_len) {
446 result = -ENOMEM;
447 goto done;
448 }
449 if (copy_to_user((void __user *)(unsigned long)cmd.data,
450 uevent->data, uevent->data_len)) {
451 result = -EFAULT;
452 goto done;
453 }
454 }
455
456 if (uevent->info) {
457 if (cmd.info_len < uevent->info_len) {
458 result = -ENOMEM;
459 goto done;
460 }
461 if (copy_to_user((void __user *)(unsigned long)cmd.info,
462 uevent->info, uevent->info_len)) {
463 result = -EFAULT;
464 goto done;
465 }
466 }
467
468 list_del(&uevent->file_list);
469 list_del(&uevent->ctx_list);
470 uevent->ctx->events_reported++;
471
472 kfree(uevent->data);
473 kfree(uevent->info);
474 kfree(uevent);
475 done:
476 mutex_unlock(&file->file_mutex);
477 return result;
478 }
479
480 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
481 const char __user *inbuf,
482 int in_len, int out_len)
483 {
484 struct ib_ucm_create_id cmd;
485 struct ib_ucm_create_id_resp resp;
486 struct ib_ucm_context *ctx;
487 int result;
488
489 if (out_len < sizeof(resp))
490 return -ENOSPC;
491
492 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
493 return -EFAULT;
494
495 mutex_lock(&file->file_mutex);
496 ctx = ib_ucm_ctx_alloc(file);
497 mutex_unlock(&file->file_mutex);
498 if (!ctx)
499 return -ENOMEM;
500
501 ctx->uid = cmd.uid;
502 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
503 ib_ucm_event_handler, ctx);
504 if (IS_ERR(ctx->cm_id)) {
505 result = PTR_ERR(ctx->cm_id);
506 goto err1;
507 }
508
509 resp.id = ctx->id;
510 if (copy_to_user((void __user *)(unsigned long)cmd.response,
511 &resp, sizeof(resp))) {
512 result = -EFAULT;
513 goto err2;
514 }
515 return 0;
516
517 err2:
518 ib_destroy_cm_id(ctx->cm_id);
519 err1:
520 mutex_lock(&ctx_id_mutex);
521 idr_remove(&ctx_id_table, ctx->id);
522 mutex_unlock(&ctx_id_mutex);
523 kfree(ctx);
524 return result;
525 }
526
527 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
528 const char __user *inbuf,
529 int in_len, int out_len)
530 {
531 struct ib_ucm_destroy_id cmd;
532 struct ib_ucm_destroy_id_resp resp;
533 struct ib_ucm_context *ctx;
534 int result = 0;
535
536 if (out_len < sizeof(resp))
537 return -ENOSPC;
538
539 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
540 return -EFAULT;
541
542 mutex_lock(&ctx_id_mutex);
543 ctx = idr_find(&ctx_id_table, cmd.id);
544 if (!ctx)
545 ctx = ERR_PTR(-ENOENT);
546 else if (ctx->file != file)
547 ctx = ERR_PTR(-EINVAL);
548 else
549 idr_remove(&ctx_id_table, ctx->id);
550 mutex_unlock(&ctx_id_mutex);
551
552 if (IS_ERR(ctx))
553 return PTR_ERR(ctx);
554
555 ib_ucm_ctx_put(ctx);
556 wait_for_completion(&ctx->comp);
557
558 /* No new events will be generated after destroying the cm_id. */
559 ib_destroy_cm_id(ctx->cm_id);
560 /* Cleanup events not yet reported to the user. */
561 ib_ucm_cleanup_events(ctx);
562
563 resp.events_reported = ctx->events_reported;
564 if (copy_to_user((void __user *)(unsigned long)cmd.response,
565 &resp, sizeof(resp)))
566 result = -EFAULT;
567
568 kfree(ctx);
569 return result;
570 }
571
572 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
573 const char __user *inbuf,
574 int in_len, int out_len)
575 {
576 struct ib_ucm_attr_id_resp resp;
577 struct ib_ucm_attr_id cmd;
578 struct ib_ucm_context *ctx;
579 int result = 0;
580
581 if (out_len < sizeof(resp))
582 return -ENOSPC;
583
584 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
585 return -EFAULT;
586
587 ctx = ib_ucm_ctx_get(file, cmd.id);
588 if (IS_ERR(ctx))
589 return PTR_ERR(ctx);
590
591 resp.service_id = ctx->cm_id->service_id;
592 resp.service_mask = ctx->cm_id->service_mask;
593 resp.local_id = ctx->cm_id->local_id;
594 resp.remote_id = ctx->cm_id->remote_id;
595
596 if (copy_to_user((void __user *)(unsigned long)cmd.response,
597 &resp, sizeof(resp)))
598 result = -EFAULT;
599
600 ib_ucm_ctx_put(ctx);
601 return result;
602 }
603
604 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
605 const char __user *inbuf,
606 int in_len, int out_len)
607 {
608 struct ib_uverbs_qp_attr resp;
609 struct ib_ucm_init_qp_attr cmd;
610 struct ib_ucm_context *ctx;
611 struct ib_qp_attr qp_attr;
612 int result = 0;
613
614 if (out_len < sizeof(resp))
615 return -ENOSPC;
616
617 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
618 return -EFAULT;
619
620 ctx = ib_ucm_ctx_get(file, cmd.id);
621 if (IS_ERR(ctx))
622 return PTR_ERR(ctx);
623
624 resp.qp_attr_mask = 0;
625 memset(&qp_attr, 0, sizeof qp_attr);
626 qp_attr.qp_state = cmd.qp_state;
627 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
628 if (result)
629 goto out;
630
631 ib_copy_qp_attr_to_user(&resp, &qp_attr);
632
633 if (copy_to_user((void __user *)(unsigned long)cmd.response,
634 &resp, sizeof(resp)))
635 result = -EFAULT;
636
637 out:
638 ib_ucm_ctx_put(ctx);
639 return result;
640 }
641
642 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
643 {
644 service_id &= service_mask;
645
646 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
647 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
648 return -EINVAL;
649
650 return 0;
651 }
652
653 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
654 const char __user *inbuf,
655 int in_len, int out_len)
656 {
657 struct ib_ucm_listen cmd;
658 struct ib_ucm_context *ctx;
659 int result;
660
661 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
662 return -EFAULT;
663
664 ctx = ib_ucm_ctx_get(file, cmd.id);
665 if (IS_ERR(ctx))
666 return PTR_ERR(ctx);
667
668 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
669 if (result)
670 goto out;
671
672 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
673 NULL);
674 out:
675 ib_ucm_ctx_put(ctx);
676 return result;
677 }
678
679 static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
680 const char __user *inbuf,
681 int in_len, int out_len)
682 {
683 struct ib_ucm_notify cmd;
684 struct ib_ucm_context *ctx;
685 int result;
686
687 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
688 return -EFAULT;
689
690 ctx = ib_ucm_ctx_get(file, cmd.id);
691 if (IS_ERR(ctx))
692 return PTR_ERR(ctx);
693
694 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
695 ib_ucm_ctx_put(ctx);
696 return result;
697 }
698
699 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
700 {
701 void *data;
702
703 *dest = NULL;
704
705 if (!len)
706 return 0;
707
708 data = kmalloc(len, GFP_KERNEL);
709 if (!data)
710 return -ENOMEM;
711
712 if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
713 kfree(data);
714 return -EFAULT;
715 }
716
717 *dest = data;
718 return 0;
719 }
720
721 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
722 {
723 struct ib_user_path_rec upath;
724 struct ib_sa_path_rec *sa_path;
725
726 *path = NULL;
727
728 if (!src)
729 return 0;
730
731 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
732 if (!sa_path)
733 return -ENOMEM;
734
735 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
736 sizeof(upath))) {
737
738 kfree(sa_path);
739 return -EFAULT;
740 }
741
742 ib_copy_path_rec_from_user(sa_path, &upath);
743 *path = sa_path;
744 return 0;
745 }
746
747 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
748 const char __user *inbuf,
749 int in_len, int out_len)
750 {
751 struct ib_cm_req_param param;
752 struct ib_ucm_context *ctx;
753 struct ib_ucm_req cmd;
754 int result;
755
756 param.private_data = NULL;
757 param.primary_path = NULL;
758 param.alternate_path = NULL;
759
760 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
761 return -EFAULT;
762
763 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
764 if (result)
765 goto done;
766
767 result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
768 if (result)
769 goto done;
770
771 result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
772 if (result)
773 goto done;
774
775 param.private_data_len = cmd.len;
776 param.service_id = cmd.sid;
777 param.qp_num = cmd.qpn;
778 param.qp_type = cmd.qp_type;
779 param.starting_psn = cmd.psn;
780 param.peer_to_peer = cmd.peer_to_peer;
781 param.responder_resources = cmd.responder_resources;
782 param.initiator_depth = cmd.initiator_depth;
783 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
784 param.flow_control = cmd.flow_control;
785 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
786 param.retry_count = cmd.retry_count;
787 param.rnr_retry_count = cmd.rnr_retry_count;
788 param.max_cm_retries = cmd.max_cm_retries;
789 param.srq = cmd.srq;
790
791 ctx = ib_ucm_ctx_get(file, cmd.id);
792 if (!IS_ERR(ctx)) {
793 result = ib_send_cm_req(ctx->cm_id, &param);
794 ib_ucm_ctx_put(ctx);
795 } else
796 result = PTR_ERR(ctx);
797
798 done:
799 kfree(param.private_data);
800 kfree(param.primary_path);
801 kfree(param.alternate_path);
802 return result;
803 }
804
805 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
806 const char __user *inbuf,
807 int in_len, int out_len)
808 {
809 struct ib_cm_rep_param param;
810 struct ib_ucm_context *ctx;
811 struct ib_ucm_rep cmd;
812 int result;
813
814 param.private_data = NULL;
815
816 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
817 return -EFAULT;
818
819 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
820 if (result)
821 return result;
822
823 param.qp_num = cmd.qpn;
824 param.starting_psn = cmd.psn;
825 param.private_data_len = cmd.len;
826 param.responder_resources = cmd.responder_resources;
827 param.initiator_depth = cmd.initiator_depth;
828 param.failover_accepted = cmd.failover_accepted;
829 param.flow_control = cmd.flow_control;
830 param.rnr_retry_count = cmd.rnr_retry_count;
831 param.srq = cmd.srq;
832
833 ctx = ib_ucm_ctx_get(file, cmd.id);
834 if (!IS_ERR(ctx)) {
835 ctx->uid = cmd.uid;
836 result = ib_send_cm_rep(ctx->cm_id, &param);
837 ib_ucm_ctx_put(ctx);
838 } else
839 result = PTR_ERR(ctx);
840
841 kfree(param.private_data);
842 return result;
843 }
844
845 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
846 const char __user *inbuf, int in_len,
847 int (*func)(struct ib_cm_id *cm_id,
848 const void *private_data,
849 u8 private_data_len))
850 {
851 struct ib_ucm_private_data cmd;
852 struct ib_ucm_context *ctx;
853 const void *private_data = NULL;
854 int result;
855
856 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
857 return -EFAULT;
858
859 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
860 if (result)
861 return result;
862
863 ctx = ib_ucm_ctx_get(file, cmd.id);
864 if (!IS_ERR(ctx)) {
865 result = func(ctx->cm_id, private_data, cmd.len);
866 ib_ucm_ctx_put(ctx);
867 } else
868 result = PTR_ERR(ctx);
869
870 kfree(private_data);
871 return result;
872 }
873
874 static ssize_t ib_ucm_send_rtu(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_rtu);
879 }
880
881 static ssize_t ib_ucm_send_dreq(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_dreq);
886 }
887
888 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
889 const char __user *inbuf,
890 int in_len, int out_len)
891 {
892 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
893 }
894
895 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
896 const char __user *inbuf, int in_len,
897 int (*func)(struct ib_cm_id *cm_id,
898 int status,
899 const void *info,
900 u8 info_len,
901 const void *data,
902 u8 data_len))
903 {
904 struct ib_ucm_context *ctx;
905 struct ib_ucm_info cmd;
906 const void *data = NULL;
907 const void *info = NULL;
908 int result;
909
910 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
911 return -EFAULT;
912
913 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
914 if (result)
915 goto done;
916
917 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
918 if (result)
919 goto done;
920
921 ctx = ib_ucm_ctx_get(file, cmd.id);
922 if (!IS_ERR(ctx)) {
923 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
924 data, cmd.data_len);
925 ib_ucm_ctx_put(ctx);
926 } else
927 result = PTR_ERR(ctx);
928
929 done:
930 kfree(data);
931 kfree(info);
932 return result;
933 }
934
935 static ssize_t ib_ucm_send_rej(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_rej);
940 }
941
942 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
943 const char __user *inbuf,
944 int in_len, int out_len)
945 {
946 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
947 }
948
949 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
950 const char __user *inbuf,
951 int in_len, int out_len)
952 {
953 struct ib_ucm_context *ctx;
954 struct ib_ucm_mra cmd;
955 const void *data = NULL;
956 int result;
957
958 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
959 return -EFAULT;
960
961 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
962 if (result)
963 return result;
964
965 ctx = ib_ucm_ctx_get(file, cmd.id);
966 if (!IS_ERR(ctx)) {
967 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
968 ib_ucm_ctx_put(ctx);
969 } else
970 result = PTR_ERR(ctx);
971
972 kfree(data);
973 return result;
974 }
975
976 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
977 const char __user *inbuf,
978 int in_len, int out_len)
979 {
980 struct ib_ucm_context *ctx;
981 struct ib_sa_path_rec *path = NULL;
982 struct ib_ucm_lap cmd;
983 const void *data = NULL;
984 int result;
985
986 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
987 return -EFAULT;
988
989 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
990 if (result)
991 goto done;
992
993 result = ib_ucm_path_get(&path, cmd.path);
994 if (result)
995 goto done;
996
997 ctx = ib_ucm_ctx_get(file, cmd.id);
998 if (!IS_ERR(ctx)) {
999 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
1000 ib_ucm_ctx_put(ctx);
1001 } else
1002 result = PTR_ERR(ctx);
1003
1004 done:
1005 kfree(data);
1006 kfree(path);
1007 return result;
1008 }
1009
1010 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1011 const char __user *inbuf,
1012 int in_len, int out_len)
1013 {
1014 struct ib_cm_sidr_req_param param;
1015 struct ib_ucm_context *ctx;
1016 struct ib_ucm_sidr_req cmd;
1017 int result;
1018
1019 param.private_data = NULL;
1020 param.path = NULL;
1021
1022 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1023 return -EFAULT;
1024
1025 result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
1026 if (result)
1027 goto done;
1028
1029 result = ib_ucm_path_get(&param.path, cmd.path);
1030 if (result)
1031 goto done;
1032
1033 param.private_data_len = cmd.len;
1034 param.service_id = cmd.sid;
1035 param.timeout_ms = cmd.timeout;
1036 param.max_cm_retries = cmd.max_cm_retries;
1037
1038 ctx = ib_ucm_ctx_get(file, cmd.id);
1039 if (!IS_ERR(ctx)) {
1040 result = ib_send_cm_sidr_req(ctx->cm_id, &param);
1041 ib_ucm_ctx_put(ctx);
1042 } else
1043 result = PTR_ERR(ctx);
1044
1045 done:
1046 kfree(param.private_data);
1047 kfree(param.path);
1048 return result;
1049 }
1050
1051 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1052 const char __user *inbuf,
1053 int in_len, int out_len)
1054 {
1055 struct ib_cm_sidr_rep_param param;
1056 struct ib_ucm_sidr_rep cmd;
1057 struct ib_ucm_context *ctx;
1058 int result;
1059
1060 param.info = NULL;
1061
1062 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1063 return -EFAULT;
1064
1065 result = ib_ucm_alloc_data(&param.private_data,
1066 cmd.data, cmd.data_len);
1067 if (result)
1068 goto done;
1069
1070 result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
1071 if (result)
1072 goto done;
1073
1074 param.qp_num = cmd.qpn;
1075 param.qkey = cmd.qkey;
1076 param.status = cmd.status;
1077 param.info_length = cmd.info_len;
1078 param.private_data_len = cmd.data_len;
1079
1080 ctx = ib_ucm_ctx_get(file, cmd.id);
1081 if (!IS_ERR(ctx)) {
1082 result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
1083 ib_ucm_ctx_put(ctx);
1084 } else
1085 result = PTR_ERR(ctx);
1086
1087 done:
1088 kfree(param.private_data);
1089 kfree(param.info);
1090 return result;
1091 }
1092
1093 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1094 const char __user *inbuf,
1095 int in_len, int out_len) = {
1096 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1097 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1098 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1099 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1100 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1101 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1102 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1103 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1104 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1105 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1106 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1107 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1108 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1109 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1110 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1111 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1112 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1113 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1114 };
1115
1116 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1117 size_t len, loff_t *pos)
1118 {
1119 struct ib_ucm_file *file = filp->private_data;
1120 struct ib_ucm_cmd_hdr hdr;
1121 ssize_t result;
1122
1123 if (len < sizeof(hdr))
1124 return -EINVAL;
1125
1126 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1127 return -EFAULT;
1128
1129 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1130 return -EINVAL;
1131
1132 if (hdr.in + sizeof(hdr) > len)
1133 return -EINVAL;
1134
1135 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1136 hdr.in, hdr.out);
1137 if (!result)
1138 result = len;
1139
1140 return result;
1141 }
1142
1143 static unsigned int ib_ucm_poll(struct file *filp,
1144 struct poll_table_struct *wait)
1145 {
1146 struct ib_ucm_file *file = filp->private_data;
1147 unsigned int mask = 0;
1148
1149 poll_wait(filp, &file->poll_wait, wait);
1150
1151 if (!list_empty(&file->events))
1152 mask = POLLIN | POLLRDNORM;
1153
1154 return mask;
1155 }
1156
1157 /*
1158 * ib_ucm_open() does not need the BKL:
1159 *
1160 * - no global state is referred to;
1161 * - there is no ioctl method to race against;
1162 * - no further module initialization is required for open to work
1163 * after the device is registered.
1164 */
1165 static int ib_ucm_open(struct inode *inode, struct file *filp)
1166 {
1167 struct ib_ucm_file *file;
1168
1169 file = kmalloc(sizeof(*file), GFP_KERNEL);
1170 if (!file)
1171 return -ENOMEM;
1172
1173 INIT_LIST_HEAD(&file->events);
1174 INIT_LIST_HEAD(&file->ctxs);
1175 init_waitqueue_head(&file->poll_wait);
1176
1177 mutex_init(&file->file_mutex);
1178
1179 filp->private_data = file;
1180 file->filp = filp;
1181 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1182
1183 return 0;
1184 }
1185
1186 static int ib_ucm_close(struct inode *inode, struct file *filp)
1187 {
1188 struct ib_ucm_file *file = filp->private_data;
1189 struct ib_ucm_context *ctx;
1190
1191 mutex_lock(&file->file_mutex);
1192 while (!list_empty(&file->ctxs)) {
1193 ctx = list_entry(file->ctxs.next,
1194 struct ib_ucm_context, file_list);
1195 mutex_unlock(&file->file_mutex);
1196
1197 mutex_lock(&ctx_id_mutex);
1198 idr_remove(&ctx_id_table, ctx->id);
1199 mutex_unlock(&ctx_id_mutex);
1200
1201 ib_destroy_cm_id(ctx->cm_id);
1202 ib_ucm_cleanup_events(ctx);
1203 kfree(ctx);
1204
1205 mutex_lock(&file->file_mutex);
1206 }
1207 mutex_unlock(&file->file_mutex);
1208 kfree(file);
1209 return 0;
1210 }
1211
1212 static void ib_ucm_release_dev(struct device *dev)
1213 {
1214 struct ib_ucm_device *ucm_dev;
1215
1216 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1217 cdev_del(&ucm_dev->cdev);
1218 clear_bit(ucm_dev->devnum, dev_map);
1219 kfree(ucm_dev);
1220 }
1221
1222 static const struct file_operations ucm_fops = {
1223 .owner = THIS_MODULE,
1224 .open = ib_ucm_open,
1225 .release = ib_ucm_close,
1226 .write = ib_ucm_write,
1227 .poll = ib_ucm_poll,
1228 };
1229
1230 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1231 char *buf)
1232 {
1233 struct ib_ucm_device *ucm_dev;
1234
1235 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1236 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1237 }
1238 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1239
1240 static void ib_ucm_add_one(struct ib_device *device)
1241 {
1242 struct ib_ucm_device *ucm_dev;
1243
1244 if (!device->alloc_ucontext ||
1245 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1246 return;
1247
1248 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1249 if (!ucm_dev)
1250 return;
1251
1252 ucm_dev->ib_dev = device;
1253
1254 ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1255 if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
1256 goto err;
1257
1258 set_bit(ucm_dev->devnum, dev_map);
1259
1260 cdev_init(&ucm_dev->cdev, &ucm_fops);
1261 ucm_dev->cdev.owner = THIS_MODULE;
1262 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1263 if (cdev_add(&ucm_dev->cdev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
1264 goto err;
1265
1266 ucm_dev->dev.class = &cm_class;
1267 ucm_dev->dev.parent = device->dma_device;
1268 ucm_dev->dev.devt = ucm_dev->cdev.dev;
1269 ucm_dev->dev.release = ib_ucm_release_dev;
1270 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1271 if (device_register(&ucm_dev->dev))
1272 goto err_cdev;
1273
1274 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1275 goto err_dev;
1276
1277 ib_set_client_data(device, &ucm_client, ucm_dev);
1278 return;
1279
1280 err_dev:
1281 device_unregister(&ucm_dev->dev);
1282 err_cdev:
1283 cdev_del(&ucm_dev->cdev);
1284 clear_bit(ucm_dev->devnum, dev_map);
1285 err:
1286 kfree(ucm_dev);
1287 return;
1288 }
1289
1290 static void ib_ucm_remove_one(struct ib_device *device)
1291 {
1292 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1293
1294 if (!ucm_dev)
1295 return;
1296
1297 device_unregister(&ucm_dev->dev);
1298 }
1299
1300 static ssize_t show_abi_version(struct class *class, char *buf)
1301 {
1302 return sprintf(buf, "%d\n", IB_USER_CM_ABI_VERSION);
1303 }
1304 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1305
1306 static int __init ib_ucm_init(void)
1307 {
1308 int ret;
1309
1310 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1311 "infiniband_cm");
1312 if (ret) {
1313 printk(KERN_ERR "ucm: couldn't register device number\n");
1314 goto error1;
1315 }
1316
1317 ret = class_create_file(&cm_class, &class_attr_abi_version);
1318 if (ret) {
1319 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1320 goto error2;
1321 }
1322
1323 ret = ib_register_client(&ucm_client);
1324 if (ret) {
1325 printk(KERN_ERR "ucm: couldn't register client\n");
1326 goto error3;
1327 }
1328 return 0;
1329
1330 error3:
1331 class_remove_file(&cm_class, &class_attr_abi_version);
1332 error2:
1333 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1334 error1:
1335 return ret;
1336 }
1337
1338 static void __exit ib_ucm_cleanup(void)
1339 {
1340 ib_unregister_client(&ucm_client);
1341 class_remove_file(&cm_class, &class_attr_abi_version);
1342 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1343 idr_destroy(&ctx_id_table);
1344 }
1345
1346 module_init(ib_ucm_init);
1347 module_exit(ib_ucm_cleanup);
Linux with added FPC-III support