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Linux 3.9-rc4
[linux-2.6/cjktty.git] / drivers / infiniband / core / ucma.c
blob5ca44cd9b00cc5113968077783400c59912503b9
1 /*
2 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <linux/completion.h>
34 #include <linux/file.h>
35 #include <linux/mutex.h>
36 #include <linux/poll.h>
37 #include <linux/sched.h>
38 #include <linux/idr.h>
39 #include <linux/in.h>
40 #include <linux/in6.h>
41 #include <linux/miscdevice.h>
42 #include <linux/slab.h>
43 #include <linux/sysctl.h>
44 #include <linux/module.h>
45
46 #include <rdma/rdma_user_cm.h>
47 #include <rdma/ib_marshall.h>
48 #include <rdma/rdma_cm.h>
49 #include <rdma/rdma_cm_ib.h>
50
51 MODULE_AUTHOR("Sean Hefty");
52 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 static unsigned int max_backlog = 1024;
56
57 static struct ctl_table_header *ucma_ctl_table_hdr;
58 static ctl_table ucma_ctl_table[] = {
59 {
60 .procname = "max_backlog",
61 .data = &max_backlog,
62 .maxlen = sizeof max_backlog,
63 .mode = 0644,
64 .proc_handler = proc_dointvec,
65 },
66 { }
67 };
68
69 struct ucma_file {
70 struct mutex mut;
71 struct file *filp;
72 struct list_head ctx_list;
73 struct list_head event_list;
74 wait_queue_head_t poll_wait;
75 };
76
77 struct ucma_context {
78 int id;
79 struct completion comp;
80 atomic_t ref;
81 int events_reported;
82 int backlog;
83
84 struct ucma_file *file;
85 struct rdma_cm_id *cm_id;
86 u64 uid;
87
88 struct list_head list;
89 struct list_head mc_list;
90 };
91
92 struct ucma_multicast {
93 struct ucma_context *ctx;
94 int id;
95 int events_reported;
96
97 u64 uid;
98 struct list_head list;
99 struct sockaddr_storage addr;
100 };
101
102 struct ucma_event {
103 struct ucma_context *ctx;
104 struct ucma_multicast *mc;
105 struct list_head list;
106 struct rdma_cm_id *cm_id;
107 struct rdma_ucm_event_resp resp;
108 };
109
110 static DEFINE_MUTEX(mut);
111 static DEFINE_IDR(ctx_idr);
112 static DEFINE_IDR(multicast_idr);
113
114 static inline struct ucma_context *_ucma_find_context(int id,
115 struct ucma_file *file)
116 {
117 struct ucma_context *ctx;
118
119 ctx = idr_find(&ctx_idr, id);
120 if (!ctx)
121 ctx = ERR_PTR(-ENOENT);
122 else if (ctx->file != file)
123 ctx = ERR_PTR(-EINVAL);
124 return ctx;
125 }
126
127 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
128 {
129 struct ucma_context *ctx;
130
131 mutex_lock(&mut);
132 ctx = _ucma_find_context(id, file);
133 if (!IS_ERR(ctx))
134 atomic_inc(&ctx->ref);
135 mutex_unlock(&mut);
136 return ctx;
137 }
138
139 static void ucma_put_ctx(struct ucma_context *ctx)
140 {
141 if (atomic_dec_and_test(&ctx->ref))
142 complete(&ctx->comp);
143 }
144
145 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
146 {
147 struct ucma_context *ctx;
148
149 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
150 if (!ctx)
151 return NULL;
152
153 atomic_set(&ctx->ref, 1);
154 init_completion(&ctx->comp);
155 INIT_LIST_HEAD(&ctx->mc_list);
156 ctx->file = file;
157
158 mutex_lock(&mut);
159 ctx->id = idr_alloc(&ctx_idr, ctx, 0, 0, GFP_KERNEL);
160 mutex_unlock(&mut);
161 if (ctx->id < 0)
162 goto error;
163
164 list_add_tail(&ctx->list, &file->ctx_list);
165 return ctx;
166
167 error:
168 kfree(ctx);
169 return NULL;
170 }
171
172 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
173 {
174 struct ucma_multicast *mc;
175
176 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
177 if (!mc)
178 return NULL;
179
180 mutex_lock(&mut);
181 mc->id = idr_alloc(&multicast_idr, mc, 0, 0, GFP_KERNEL);
182 mutex_unlock(&mut);
183 if (mc->id < 0)
184 goto error;
185
186 mc->ctx = ctx;
187 list_add_tail(&mc->list, &ctx->mc_list);
188 return mc;
189
190 error:
191 kfree(mc);
192 return NULL;
193 }
194
195 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
196 struct rdma_conn_param *src)
197 {
198 if (src->private_data_len)
199 memcpy(dst->private_data, src->private_data,
200 src->private_data_len);
201 dst->private_data_len = src->private_data_len;
202 dst->responder_resources =src->responder_resources;
203 dst->initiator_depth = src->initiator_depth;
204 dst->flow_control = src->flow_control;
205 dst->retry_count = src->retry_count;
206 dst->rnr_retry_count = src->rnr_retry_count;
207 dst->srq = src->srq;
208 dst->qp_num = src->qp_num;
209 }
210
211 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
212 struct rdma_ud_param *src)
213 {
214 if (src->private_data_len)
215 memcpy(dst->private_data, src->private_data,
216 src->private_data_len);
217 dst->private_data_len = src->private_data_len;
218 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
219 dst->qp_num = src->qp_num;
220 dst->qkey = src->qkey;
221 }
222
223 static void ucma_set_event_context(struct ucma_context *ctx,
224 struct rdma_cm_event *event,
225 struct ucma_event *uevent)
226 {
227 uevent->ctx = ctx;
228 switch (event->event) {
229 case RDMA_CM_EVENT_MULTICAST_JOIN:
230 case RDMA_CM_EVENT_MULTICAST_ERROR:
231 uevent->mc = (struct ucma_multicast *)
232 event->param.ud.private_data;
233 uevent->resp.uid = uevent->mc->uid;
234 uevent->resp.id = uevent->mc->id;
235 break;
236 default:
237 uevent->resp.uid = ctx->uid;
238 uevent->resp.id = ctx->id;
239 break;
240 }
241 }
242
243 static int ucma_event_handler(struct rdma_cm_id *cm_id,
244 struct rdma_cm_event *event)
245 {
246 struct ucma_event *uevent;
247 struct ucma_context *ctx = cm_id->context;
248 int ret = 0;
249
250 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
251 if (!uevent)
252 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
253
254 mutex_lock(&ctx->file->mut);
255 uevent->cm_id = cm_id;
256 ucma_set_event_context(ctx, event, uevent);
257 uevent->resp.event = event->event;
258 uevent->resp.status = event->status;
259 if (cm_id->qp_type == IB_QPT_UD)
260 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
261 else
262 ucma_copy_conn_event(&uevent->resp.param.conn,
263 &event->param.conn);
264
265 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
266 if (!ctx->backlog) {
267 ret = -ENOMEM;
268 kfree(uevent);
269 goto out;
270 }
271 ctx->backlog--;
272 } else if (!ctx->uid) {
273 /*
274 * We ignore events for new connections until userspace has set
275 * their context. This can only happen if an error occurs on a
276 * new connection before the user accepts it. This is okay,
277 * since the accept will just fail later.
278 */
279 kfree(uevent);
280 goto out;
281 }
282
283 list_add_tail(&uevent->list, &ctx->file->event_list);
284 wake_up_interruptible(&ctx->file->poll_wait);
285 out:
286 mutex_unlock(&ctx->file->mut);
287 return ret;
288 }
289
290 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
291 int in_len, int out_len)
292 {
293 struct ucma_context *ctx;
294 struct rdma_ucm_get_event cmd;
295 struct ucma_event *uevent;
296 int ret = 0;
297
298 if (out_len < sizeof uevent->resp)
299 return -ENOSPC;
300
301 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
302 return -EFAULT;
303
304 mutex_lock(&file->mut);
305 while (list_empty(&file->event_list)) {
306 mutex_unlock(&file->mut);
307
308 if (file->filp->f_flags & O_NONBLOCK)
309 return -EAGAIN;
310
311 if (wait_event_interruptible(file->poll_wait,
312 !list_empty(&file->event_list)))
313 return -ERESTARTSYS;
314
315 mutex_lock(&file->mut);
316 }
317
318 uevent = list_entry(file->event_list.next, struct ucma_event, list);
319
320 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
321 ctx = ucma_alloc_ctx(file);
322 if (!ctx) {
323 ret = -ENOMEM;
324 goto done;
325 }
326 uevent->ctx->backlog++;
327 ctx->cm_id = uevent->cm_id;
328 ctx->cm_id->context = ctx;
329 uevent->resp.id = ctx->id;
330 }
331
332 if (copy_to_user((void __user *)(unsigned long)cmd.response,
333 &uevent->resp, sizeof uevent->resp)) {
334 ret = -EFAULT;
335 goto done;
336 }
337
338 list_del(&uevent->list);
339 uevent->ctx->events_reported++;
340 if (uevent->mc)
341 uevent->mc->events_reported++;
342 kfree(uevent);
343 done:
344 mutex_unlock(&file->mut);
345 return ret;
346 }
347
348 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
349 {
350 switch (cmd->ps) {
351 case RDMA_PS_TCP:
352 *qp_type = IB_QPT_RC;
353 return 0;
354 case RDMA_PS_UDP:
355 case RDMA_PS_IPOIB:
356 *qp_type = IB_QPT_UD;
357 return 0;
358 case RDMA_PS_IB:
359 *qp_type = cmd->qp_type;
360 return 0;
361 default:
362 return -EINVAL;
363 }
364 }
365
366 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
367 int in_len, int out_len)
368 {
369 struct rdma_ucm_create_id cmd;
370 struct rdma_ucm_create_id_resp resp;
371 struct ucma_context *ctx;
372 enum ib_qp_type qp_type;
373 int ret;
374
375 if (out_len < sizeof(resp))
376 return -ENOSPC;
377
378 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
379 return -EFAULT;
380
381 ret = ucma_get_qp_type(&cmd, &qp_type);
382 if (ret)
383 return ret;
384
385 mutex_lock(&file->mut);
386 ctx = ucma_alloc_ctx(file);
387 mutex_unlock(&file->mut);
388 if (!ctx)
389 return -ENOMEM;
390
391 ctx->uid = cmd.uid;
392 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type);
393 if (IS_ERR(ctx->cm_id)) {
394 ret = PTR_ERR(ctx->cm_id);
395 goto err1;
396 }
397
398 resp.id = ctx->id;
399 if (copy_to_user((void __user *)(unsigned long)cmd.response,
400 &resp, sizeof(resp))) {
401 ret = -EFAULT;
402 goto err2;
403 }
404 return 0;
405
406 err2:
407 rdma_destroy_id(ctx->cm_id);
408 err1:
409 mutex_lock(&mut);
410 idr_remove(&ctx_idr, ctx->id);
411 mutex_unlock(&mut);
412 kfree(ctx);
413 return ret;
414 }
415
416 static void ucma_cleanup_multicast(struct ucma_context *ctx)
417 {
418 struct ucma_multicast *mc, *tmp;
419
420 mutex_lock(&mut);
421 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
422 list_del(&mc->list);
423 idr_remove(&multicast_idr, mc->id);
424 kfree(mc);
425 }
426 mutex_unlock(&mut);
427 }
428
429 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
430 {
431 struct ucma_event *uevent, *tmp;
432
433 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
434 if (uevent->mc != mc)
435 continue;
436
437 list_del(&uevent->list);
438 kfree(uevent);
439 }
440 }
441
442 /*
443 * We cannot hold file->mut when calling rdma_destroy_id() or we can
444 * deadlock. We also acquire file->mut in ucma_event_handler(), and
445 * rdma_destroy_id() will wait until all callbacks have completed.
446 */
447 static int ucma_free_ctx(struct ucma_context *ctx)
448 {
449 int events_reported;
450 struct ucma_event *uevent, *tmp;
451 LIST_HEAD(list);
452
453 /* No new events will be generated after destroying the id. */
454 rdma_destroy_id(ctx->cm_id);
455
456 ucma_cleanup_multicast(ctx);
457
458 /* Cleanup events not yet reported to the user. */
459 mutex_lock(&ctx->file->mut);
460 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
461 if (uevent->ctx == ctx)
462 list_move_tail(&uevent->list, &list);
463 }
464 list_del(&ctx->list);
465 mutex_unlock(&ctx->file->mut);
466
467 list_for_each_entry_safe(uevent, tmp, &list, list) {
468 list_del(&uevent->list);
469 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
470 rdma_destroy_id(uevent->cm_id);
471 kfree(uevent);
472 }
473
474 events_reported = ctx->events_reported;
475 kfree(ctx);
476 return events_reported;
477 }
478
479 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
480 int in_len, int out_len)
481 {
482 struct rdma_ucm_destroy_id cmd;
483 struct rdma_ucm_destroy_id_resp resp;
484 struct ucma_context *ctx;
485 int ret = 0;
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(&mut);
494 ctx = _ucma_find_context(cmd.id, file);
495 if (!IS_ERR(ctx))
496 idr_remove(&ctx_idr, ctx->id);
497 mutex_unlock(&mut);
498
499 if (IS_ERR(ctx))
500 return PTR_ERR(ctx);
501
502 ucma_put_ctx(ctx);
503 wait_for_completion(&ctx->comp);
504 resp.events_reported = ucma_free_ctx(ctx);
505
506 if (copy_to_user((void __user *)(unsigned long)cmd.response,
507 &resp, sizeof(resp)))
508 ret = -EFAULT;
509
510 return ret;
511 }
512
513 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
514 int in_len, int out_len)
515 {
516 struct rdma_ucm_bind_addr cmd;
517 struct ucma_context *ctx;
518 int ret;
519
520 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
521 return -EFAULT;
522
523 ctx = ucma_get_ctx(file, cmd.id);
524 if (IS_ERR(ctx))
525 return PTR_ERR(ctx);
526
527 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
528 ucma_put_ctx(ctx);
529 return ret;
530 }
531
532 static ssize_t ucma_resolve_addr(struct ucma_file *file,
533 const char __user *inbuf,
534 int in_len, int out_len)
535 {
536 struct rdma_ucm_resolve_addr cmd;
537 struct ucma_context *ctx;
538 int ret;
539
540 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
541 return -EFAULT;
542
543 ctx = ucma_get_ctx(file, cmd.id);
544 if (IS_ERR(ctx))
545 return PTR_ERR(ctx);
546
547 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
548 (struct sockaddr *) &cmd.dst_addr,
549 cmd.timeout_ms);
550 ucma_put_ctx(ctx);
551 return ret;
552 }
553
554 static ssize_t ucma_resolve_route(struct ucma_file *file,
555 const char __user *inbuf,
556 int in_len, int out_len)
557 {
558 struct rdma_ucm_resolve_route cmd;
559 struct ucma_context *ctx;
560 int ret;
561
562 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
563 return -EFAULT;
564
565 ctx = ucma_get_ctx(file, cmd.id);
566 if (IS_ERR(ctx))
567 return PTR_ERR(ctx);
568
569 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
570 ucma_put_ctx(ctx);
571 return ret;
572 }
573
574 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
575 struct rdma_route *route)
576 {
577 struct rdma_dev_addr *dev_addr;
578
579 resp->num_paths = route->num_paths;
580 switch (route->num_paths) {
581 case 0:
582 dev_addr = &route->addr.dev_addr;
583 rdma_addr_get_dgid(dev_addr,
584 (union ib_gid *) &resp->ib_route[0].dgid);
585 rdma_addr_get_sgid(dev_addr,
586 (union ib_gid *) &resp->ib_route[0].sgid);
587 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
588 break;
589 case 2:
590 ib_copy_path_rec_to_user(&resp->ib_route[1],
591 &route->path_rec[1]);
592 /* fall through */
593 case 1:
594 ib_copy_path_rec_to_user(&resp->ib_route[0],
595 &route->path_rec[0]);
596 break;
597 default:
598 break;
599 }
600 }
601
602 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
603 struct rdma_route *route)
604 {
605 struct rdma_dev_addr *dev_addr;
606 struct net_device *dev;
607 u16 vid = 0;
608
609 resp->num_paths = route->num_paths;
610 switch (route->num_paths) {
611 case 0:
612 dev_addr = &route->addr.dev_addr;
613 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
614 if (dev) {
615 vid = rdma_vlan_dev_vlan_id(dev);
616 dev_put(dev);
617 }
618
619 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
620 dev_addr->dst_dev_addr, vid);
621 iboe_addr_get_sgid(dev_addr,
622 (union ib_gid *) &resp->ib_route[0].sgid);
623 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
624 break;
625 case 2:
626 ib_copy_path_rec_to_user(&resp->ib_route[1],
627 &route->path_rec[1]);
628 /* fall through */
629 case 1:
630 ib_copy_path_rec_to_user(&resp->ib_route[0],
631 &route->path_rec[0]);
632 break;
633 default:
634 break;
635 }
636 }
637
638 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
639 struct rdma_route *route)
640 {
641 struct rdma_dev_addr *dev_addr;
642
643 dev_addr = &route->addr.dev_addr;
644 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
645 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
646 }
647
648 static ssize_t ucma_query_route(struct ucma_file *file,
649 const char __user *inbuf,
650 int in_len, int out_len)
651 {
652 struct rdma_ucm_query_route cmd;
653 struct rdma_ucm_query_route_resp resp;
654 struct ucma_context *ctx;
655 struct sockaddr *addr;
656 int ret = 0;
657
658 if (out_len < sizeof(resp))
659 return -ENOSPC;
660
661 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
662 return -EFAULT;
663
664 ctx = ucma_get_ctx(file, cmd.id);
665 if (IS_ERR(ctx))
666 return PTR_ERR(ctx);
667
668 memset(&resp, 0, sizeof resp);
669 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
670 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
671 sizeof(struct sockaddr_in) :
672 sizeof(struct sockaddr_in6));
673 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
674 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
675 sizeof(struct sockaddr_in) :
676 sizeof(struct sockaddr_in6));
677 if (!ctx->cm_id->device)
678 goto out;
679
680 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
681 resp.port_num = ctx->cm_id->port_num;
682 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
683 case RDMA_TRANSPORT_IB:
684 switch (rdma_port_get_link_layer(ctx->cm_id->device,
685 ctx->cm_id->port_num)) {
686 case IB_LINK_LAYER_INFINIBAND:
687 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
688 break;
689 case IB_LINK_LAYER_ETHERNET:
690 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
691 break;
692 default:
693 break;
694 }
695 break;
696 case RDMA_TRANSPORT_IWARP:
697 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
698 break;
699 default:
700 break;
701 }
702
703 out:
704 if (copy_to_user((void __user *)(unsigned long)cmd.response,
705 &resp, sizeof(resp)))
706 ret = -EFAULT;
707
708 ucma_put_ctx(ctx);
709 return ret;
710 }
711
712 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
713 struct rdma_ucm_conn_param *src)
714 {
715 dst->private_data = src->private_data;
716 dst->private_data_len = src->private_data_len;
717 dst->responder_resources =src->responder_resources;
718 dst->initiator_depth = src->initiator_depth;
719 dst->flow_control = src->flow_control;
720 dst->retry_count = src->retry_count;
721 dst->rnr_retry_count = src->rnr_retry_count;
722 dst->srq = src->srq;
723 dst->qp_num = src->qp_num;
724 }
725
726 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
727 int in_len, int out_len)
728 {
729 struct rdma_ucm_connect cmd;
730 struct rdma_conn_param conn_param;
731 struct ucma_context *ctx;
732 int ret;
733
734 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
735 return -EFAULT;
736
737 if (!cmd.conn_param.valid)
738 return -EINVAL;
739
740 ctx = ucma_get_ctx(file, cmd.id);
741 if (IS_ERR(ctx))
742 return PTR_ERR(ctx);
743
744 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
745 ret = rdma_connect(ctx->cm_id, &conn_param);
746 ucma_put_ctx(ctx);
747 return ret;
748 }
749
750 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
751 int in_len, int out_len)
752 {
753 struct rdma_ucm_listen cmd;
754 struct ucma_context *ctx;
755 int ret;
756
757 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
758 return -EFAULT;
759
760 ctx = ucma_get_ctx(file, cmd.id);
761 if (IS_ERR(ctx))
762 return PTR_ERR(ctx);
763
764 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
765 cmd.backlog : max_backlog;
766 ret = rdma_listen(ctx->cm_id, ctx->backlog);
767 ucma_put_ctx(ctx);
768 return ret;
769 }
770
771 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
772 int in_len, int out_len)
773 {
774 struct rdma_ucm_accept cmd;
775 struct rdma_conn_param conn_param;
776 struct ucma_context *ctx;
777 int ret;
778
779 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
780 return -EFAULT;
781
782 ctx = ucma_get_ctx(file, cmd.id);
783 if (IS_ERR(ctx))
784 return PTR_ERR(ctx);
785
786 if (cmd.conn_param.valid) {
787 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
788 mutex_lock(&file->mut);
789 ret = rdma_accept(ctx->cm_id, &conn_param);
790 if (!ret)
791 ctx->uid = cmd.uid;
792 mutex_unlock(&file->mut);
793 } else
794 ret = rdma_accept(ctx->cm_id, NULL);
795
796 ucma_put_ctx(ctx);
797 return ret;
798 }
799
800 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
801 int in_len, int out_len)
802 {
803 struct rdma_ucm_reject cmd;
804 struct ucma_context *ctx;
805 int ret;
806
807 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
808 return -EFAULT;
809
810 ctx = ucma_get_ctx(file, cmd.id);
811 if (IS_ERR(ctx))
812 return PTR_ERR(ctx);
813
814 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
815 ucma_put_ctx(ctx);
816 return ret;
817 }
818
819 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
820 int in_len, int out_len)
821 {
822 struct rdma_ucm_disconnect cmd;
823 struct ucma_context *ctx;
824 int ret;
825
826 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
827 return -EFAULT;
828
829 ctx = ucma_get_ctx(file, cmd.id);
830 if (IS_ERR(ctx))
831 return PTR_ERR(ctx);
832
833 ret = rdma_disconnect(ctx->cm_id);
834 ucma_put_ctx(ctx);
835 return ret;
836 }
837
838 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
839 const char __user *inbuf,
840 int in_len, int out_len)
841 {
842 struct rdma_ucm_init_qp_attr cmd;
843 struct ib_uverbs_qp_attr resp;
844 struct ucma_context *ctx;
845 struct ib_qp_attr qp_attr;
846 int ret;
847
848 if (out_len < sizeof(resp))
849 return -ENOSPC;
850
851 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
852 return -EFAULT;
853
854 ctx = ucma_get_ctx(file, cmd.id);
855 if (IS_ERR(ctx))
856 return PTR_ERR(ctx);
857
858 resp.qp_attr_mask = 0;
859 memset(&qp_attr, 0, sizeof qp_attr);
860 qp_attr.qp_state = cmd.qp_state;
861 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
862 if (ret)
863 goto out;
864
865 ib_copy_qp_attr_to_user(&resp, &qp_attr);
866 if (copy_to_user((void __user *)(unsigned long)cmd.response,
867 &resp, sizeof(resp)))
868 ret = -EFAULT;
869
870 out:
871 ucma_put_ctx(ctx);
872 return ret;
873 }
874
875 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
876 void *optval, size_t optlen)
877 {
878 int ret = 0;
879
880 switch (optname) {
881 case RDMA_OPTION_ID_TOS:
882 if (optlen != sizeof(u8)) {
883 ret = -EINVAL;
884 break;
885 }
886 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
887 break;
888 case RDMA_OPTION_ID_REUSEADDR:
889 if (optlen != sizeof(int)) {
890 ret = -EINVAL;
891 break;
892 }
893 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
894 break;
895 case RDMA_OPTION_ID_AFONLY:
896 if (optlen != sizeof(int)) {
897 ret = -EINVAL;
898 break;
899 }
900 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
901 break;
902 default:
903 ret = -ENOSYS;
904 }
905
906 return ret;
907 }
908
909 static int ucma_set_ib_path(struct ucma_context *ctx,
910 struct ib_path_rec_data *path_data, size_t optlen)
911 {
912 struct ib_sa_path_rec sa_path;
913 struct rdma_cm_event event;
914 int ret;
915
916 if (optlen % sizeof(*path_data))
917 return -EINVAL;
918
919 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
920 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
921 IB_PATH_BIDIRECTIONAL))
922 break;
923 }
924
925 if (!optlen)
926 return -EINVAL;
927
928 ib_sa_unpack_path(path_data->path_rec, &sa_path);
929 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
930 if (ret)
931 return ret;
932
933 memset(&event, 0, sizeof event);
934 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
935 return ucma_event_handler(ctx->cm_id, &event);
936 }
937
938 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
939 void *optval, size_t optlen)
940 {
941 int ret;
942
943 switch (optname) {
944 case RDMA_OPTION_IB_PATH:
945 ret = ucma_set_ib_path(ctx, optval, optlen);
946 break;
947 default:
948 ret = -ENOSYS;
949 }
950
951 return ret;
952 }
953
954 static int ucma_set_option_level(struct ucma_context *ctx, int level,
955 int optname, void *optval, size_t optlen)
956 {
957 int ret;
958
959 switch (level) {
960 case RDMA_OPTION_ID:
961 ret = ucma_set_option_id(ctx, optname, optval, optlen);
962 break;
963 case RDMA_OPTION_IB:
964 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
965 break;
966 default:
967 ret = -ENOSYS;
968 }
969
970 return ret;
971 }
972
973 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
974 int in_len, int out_len)
975 {
976 struct rdma_ucm_set_option cmd;
977 struct ucma_context *ctx;
978 void *optval;
979 int ret;
980
981 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
982 return -EFAULT;
983
984 ctx = ucma_get_ctx(file, cmd.id);
985 if (IS_ERR(ctx))
986 return PTR_ERR(ctx);
987
988 optval = memdup_user((void __user *) (unsigned long) cmd.optval,
989 cmd.optlen);
990 if (IS_ERR(optval)) {
991 ret = PTR_ERR(optval);
992 goto out;
993 }
994
995 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
996 cmd.optlen);
997 kfree(optval);
998
999 out:
1000 ucma_put_ctx(ctx);
1001 return ret;
1002 }
1003
1004 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1005 int in_len, int out_len)
1006 {
1007 struct rdma_ucm_notify cmd;
1008 struct ucma_context *ctx;
1009 int ret;
1010
1011 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1012 return -EFAULT;
1013
1014 ctx = ucma_get_ctx(file, cmd.id);
1015 if (IS_ERR(ctx))
1016 return PTR_ERR(ctx);
1017
1018 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1019 ucma_put_ctx(ctx);
1020 return ret;
1021 }
1022
1023 static ssize_t ucma_join_multicast(struct ucma_file *file,
1024 const char __user *inbuf,
1025 int in_len, int out_len)
1026 {
1027 struct rdma_ucm_join_mcast cmd;
1028 struct rdma_ucm_create_id_resp resp;
1029 struct ucma_context *ctx;
1030 struct ucma_multicast *mc;
1031 int ret;
1032
1033 if (out_len < sizeof(resp))
1034 return -ENOSPC;
1035
1036 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1037 return -EFAULT;
1038
1039 ctx = ucma_get_ctx(file, cmd.id);
1040 if (IS_ERR(ctx))
1041 return PTR_ERR(ctx);
1042
1043 mutex_lock(&file->mut);
1044 mc = ucma_alloc_multicast(ctx);
1045 if (!mc) {
1046 ret = -ENOMEM;
1047 goto err1;
1048 }
1049
1050 mc->uid = cmd.uid;
1051 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
1052 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1053 if (ret)
1054 goto err2;
1055
1056 resp.id = mc->id;
1057 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1058 &resp, sizeof(resp))) {
1059 ret = -EFAULT;
1060 goto err3;
1061 }
1062
1063 mutex_unlock(&file->mut);
1064 ucma_put_ctx(ctx);
1065 return 0;
1066
1067 err3:
1068 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1069 ucma_cleanup_mc_events(mc);
1070 err2:
1071 mutex_lock(&mut);
1072 idr_remove(&multicast_idr, mc->id);
1073 mutex_unlock(&mut);
1074 list_del(&mc->list);
1075 kfree(mc);
1076 err1:
1077 mutex_unlock(&file->mut);
1078 ucma_put_ctx(ctx);
1079 return ret;
1080 }
1081
1082 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1083 const char __user *inbuf,
1084 int in_len, int out_len)
1085 {
1086 struct rdma_ucm_destroy_id cmd;
1087 struct rdma_ucm_destroy_id_resp resp;
1088 struct ucma_multicast *mc;
1089 int ret = 0;
1090
1091 if (out_len < sizeof(resp))
1092 return -ENOSPC;
1093
1094 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1095 return -EFAULT;
1096
1097 mutex_lock(&mut);
1098 mc = idr_find(&multicast_idr, cmd.id);
1099 if (!mc)
1100 mc = ERR_PTR(-ENOENT);
1101 else if (mc->ctx->file != file)
1102 mc = ERR_PTR(-EINVAL);
1103 else {
1104 idr_remove(&multicast_idr, mc->id);
1105 atomic_inc(&mc->ctx->ref);
1106 }
1107 mutex_unlock(&mut);
1108
1109 if (IS_ERR(mc)) {
1110 ret = PTR_ERR(mc);
1111 goto out;
1112 }
1113
1114 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1115 mutex_lock(&mc->ctx->file->mut);
1116 ucma_cleanup_mc_events(mc);
1117 list_del(&mc->list);
1118 mutex_unlock(&mc->ctx->file->mut);
1119
1120 ucma_put_ctx(mc->ctx);
1121 resp.events_reported = mc->events_reported;
1122 kfree(mc);
1123
1124 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1125 &resp, sizeof(resp)))
1126 ret = -EFAULT;
1127 out:
1128 return ret;
1129 }
1130
1131 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1132 {
1133 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1134 if (file1 < file2) {
1135 mutex_lock(&file1->mut);
1136 mutex_lock(&file2->mut);
1137 } else {
1138 mutex_lock(&file2->mut);
1139 mutex_lock(&file1->mut);
1140 }
1141 }
1142
1143 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1144 {
1145 if (file1 < file2) {
1146 mutex_unlock(&file2->mut);
1147 mutex_unlock(&file1->mut);
1148 } else {
1149 mutex_unlock(&file1->mut);
1150 mutex_unlock(&file2->mut);
1151 }
1152 }
1153
1154 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1155 {
1156 struct ucma_event *uevent, *tmp;
1157
1158 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1159 if (uevent->ctx == ctx)
1160 list_move_tail(&uevent->list, &file->event_list);
1161 }
1162
1163 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1164 const char __user *inbuf,
1165 int in_len, int out_len)
1166 {
1167 struct rdma_ucm_migrate_id cmd;
1168 struct rdma_ucm_migrate_resp resp;
1169 struct ucma_context *ctx;
1170 struct fd f;
1171 struct ucma_file *cur_file;
1172 int ret = 0;
1173
1174 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1175 return -EFAULT;
1176
1177 /* Get current fd to protect against it being closed */
1178 f = fdget(cmd.fd);
1179 if (!f.file)
1180 return -ENOENT;
1181
1182 /* Validate current fd and prevent destruction of id. */
1183 ctx = ucma_get_ctx(f.file->private_data, cmd.id);
1184 if (IS_ERR(ctx)) {
1185 ret = PTR_ERR(ctx);
1186 goto file_put;
1187 }
1188
1189 cur_file = ctx->file;
1190 if (cur_file == new_file) {
1191 resp.events_reported = ctx->events_reported;
1192 goto response;
1193 }
1194
1195 /*
1196 * Migrate events between fd's, maintaining order, and avoiding new
1197 * events being added before existing events.
1198 */
1199 ucma_lock_files(cur_file, new_file);
1200 mutex_lock(&mut);
1201
1202 list_move_tail(&ctx->list, &new_file->ctx_list);
1203 ucma_move_events(ctx, new_file);
1204 ctx->file = new_file;
1205 resp.events_reported = ctx->events_reported;
1206
1207 mutex_unlock(&mut);
1208 ucma_unlock_files(cur_file, new_file);
1209
1210 response:
1211 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1212 &resp, sizeof(resp)))
1213 ret = -EFAULT;
1214
1215 ucma_put_ctx(ctx);
1216 file_put:
1217 fdput(f);
1218 return ret;
1219 }
1220
1221 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1222 const char __user *inbuf,
1223 int in_len, int out_len) = {
1224 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1225 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1226 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
1227 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1228 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1229 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1230 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1231 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1232 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1233 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1234 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1235 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1236 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1237 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1238 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1239 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1240 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
1241 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1242 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
1243 };
1244
1245 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1246 size_t len, loff_t *pos)
1247 {
1248 struct ucma_file *file = filp->private_data;
1249 struct rdma_ucm_cmd_hdr hdr;
1250 ssize_t ret;
1251
1252 if (len < sizeof(hdr))
1253 return -EINVAL;
1254
1255 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1256 return -EFAULT;
1257
1258 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1259 return -EINVAL;
1260
1261 if (hdr.in + sizeof(hdr) > len)
1262 return -EINVAL;
1263
1264 if (!ucma_cmd_table[hdr.cmd])
1265 return -ENOSYS;
1266
1267 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1268 if (!ret)
1269 ret = len;
1270
1271 return ret;
1272 }
1273
1274 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1275 {
1276 struct ucma_file *file = filp->private_data;
1277 unsigned int mask = 0;
1278
1279 poll_wait(filp, &file->poll_wait, wait);
1280
1281 if (!list_empty(&file->event_list))
1282 mask = POLLIN | POLLRDNORM;
1283
1284 return mask;
1285 }
1286
1287 /*
1288 * ucma_open() does not need the BKL:
1289 *
1290 * - no global state is referred to;
1291 * - there is no ioctl method to race against;
1292 * - no further module initialization is required for open to work
1293 * after the device is registered.
1294 */
1295 static int ucma_open(struct inode *inode, struct file *filp)
1296 {
1297 struct ucma_file *file;
1298
1299 file = kmalloc(sizeof *file, GFP_KERNEL);
1300 if (!file)
1301 return -ENOMEM;
1302
1303 INIT_LIST_HEAD(&file->event_list);
1304 INIT_LIST_HEAD(&file->ctx_list);
1305 init_waitqueue_head(&file->poll_wait);
1306 mutex_init(&file->mut);
1307
1308 filp->private_data = file;
1309 file->filp = filp;
1310
1311 return nonseekable_open(inode, filp);
1312 }
1313
1314 static int ucma_close(struct inode *inode, struct file *filp)
1315 {
1316 struct ucma_file *file = filp->private_data;
1317 struct ucma_context *ctx, *tmp;
1318
1319 mutex_lock(&file->mut);
1320 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1321 mutex_unlock(&file->mut);
1322
1323 mutex_lock(&mut);
1324 idr_remove(&ctx_idr, ctx->id);
1325 mutex_unlock(&mut);
1326
1327 ucma_free_ctx(ctx);
1328 mutex_lock(&file->mut);
1329 }
1330 mutex_unlock(&file->mut);
1331 kfree(file);
1332 return 0;
1333 }
1334
1335 static const struct file_operations ucma_fops = {
1336 .owner = THIS_MODULE,
1337 .open = ucma_open,
1338 .release = ucma_close,
1339 .write = ucma_write,
1340 .poll = ucma_poll,
1341 .llseek = no_llseek,
1342 };
1343
1344 static struct miscdevice ucma_misc = {
1345 .minor = MISC_DYNAMIC_MINOR,
1346 .name = "rdma_cm",
1347 .nodename = "infiniband/rdma_cm",
1348 .mode = 0666,
1349 .fops = &ucma_fops,
1350 };
1351
1352 static ssize_t show_abi_version(struct device *dev,
1353 struct device_attribute *attr,
1354 char *buf)
1355 {
1356 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1357 }
1358 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1359
1360 static int __init ucma_init(void)
1361 {
1362 int ret;
1363
1364 ret = misc_register(&ucma_misc);
1365 if (ret)
1366 return ret;
1367
1368 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1369 if (ret) {
1370 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1371 goto err1;
1372 }
1373
1374 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1375 if (!ucma_ctl_table_hdr) {
1376 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1377 ret = -ENOMEM;
1378 goto err2;
1379 }
1380 return 0;
1381 err2:
1382 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1383 err1:
1384 misc_deregister(&ucma_misc);
1385 return ret;
1386 }
1387
1388 static void __exit ucma_cleanup(void)
1389 {
1390 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1391 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1392 misc_deregister(&ucma_misc);
1393 idr_destroy(&ctx_idr);
1394 }
1395
1396 module_init(ucma_init);
1397 module_exit(ucma_cleanup);
CJK support for tty framebuffer vt