blob: 98e05382fd3cf19e01fe2315674e0e84ff8da145 [file] [log] [blame]
Andy Grover639b3212009-02-24 15:30:18 +00001/*
2 * Copyright (c) 2006 Oracle. 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/module.h>
34#include <linux/errno.h>
35#include <linux/kernel.h>
36#include <linux/in.h>
37#include <linux/poll.h>
Andy Grover639b3212009-02-24 15:30:18 +000038#include <net/sock.h>
39
40#include "rds.h"
41#include "rdma.h"
Andy Grover639b3212009-02-24 15:30:18 +000042
43/* this is just used for stats gathering :/ */
44static DEFINE_SPINLOCK(rds_sock_lock);
45static unsigned long rds_sock_count;
46static LIST_HEAD(rds_sock_list);
47DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq);
48
49/*
50 * This is called as the final descriptor referencing this socket is closed.
51 * We have to unbind the socket so that another socket can be bound to the
52 * address it was using.
53 *
54 * We have to be careful about racing with the incoming path. sock_orphan()
55 * sets SOCK_DEAD and we use that as an indicator to the rx path that new
56 * messages shouldn't be queued.
57 */
58static int rds_release(struct socket *sock)
59{
60 struct sock *sk = sock->sk;
61 struct rds_sock *rs;
62 unsigned long flags;
63
64 if (sk == NULL)
65 goto out;
66
67 rs = rds_sk_to_rs(sk);
68
69 sock_orphan(sk);
70 /* Note - rds_clear_recv_queue grabs rs_recv_lock, so
71 * that ensures the recv path has completed messing
72 * with the socket. */
73 rds_clear_recv_queue(rs);
74 rds_cong_remove_socket(rs);
75 rds_remove_bound(rs);
76 rds_send_drop_to(rs, NULL);
77 rds_rdma_drop_keys(rs);
78 rds_notify_queue_get(rs, NULL);
79
80 spin_lock_irqsave(&rds_sock_lock, flags);
81 list_del_init(&rs->rs_item);
82 rds_sock_count--;
83 spin_unlock_irqrestore(&rds_sock_lock, flags);
84
85 sock->sk = NULL;
86 sock_put(sk);
87out:
88 return 0;
89}
90
91/*
92 * Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
93 * _bh() isn't OK here, we're called from interrupt handlers. It's probably OK
94 * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
95 * this seems more conservative.
96 * NB - normally, one would use sk_callback_lock for this, but we can
97 * get here from interrupts, whereas the network code grabs sk_callback_lock
98 * with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
99 */
100void rds_wake_sk_sleep(struct rds_sock *rs)
101{
102 unsigned long flags;
103
104 read_lock_irqsave(&rs->rs_recv_lock, flags);
105 __rds_wake_sk_sleep(rds_rs_to_sk(rs));
106 read_unlock_irqrestore(&rs->rs_recv_lock, flags);
107}
108
109static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
110 int *uaddr_len, int peer)
111{
112 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
113 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
114
115 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
116
117 /* racey, don't care */
118 if (peer) {
119 if (!rs->rs_conn_addr)
120 return -ENOTCONN;
121
122 sin->sin_port = rs->rs_conn_port;
123 sin->sin_addr.s_addr = rs->rs_conn_addr;
124 } else {
125 sin->sin_port = rs->rs_bound_port;
126 sin->sin_addr.s_addr = rs->rs_bound_addr;
127 }
128
129 sin->sin_family = AF_INET;
130
131 *uaddr_len = sizeof(*sin);
132 return 0;
133}
134
135/*
136 * RDS' poll is without a doubt the least intuitive part of the interface,
137 * as POLLIN and POLLOUT do not behave entirely as you would expect from
138 * a network protocol.
139 *
140 * POLLIN is asserted if
141 * - there is data on the receive queue.
142 * - to signal that a previously congested destination may have become
143 * uncongested
144 * - A notification has been queued to the socket (this can be a congestion
145 * update, or a RDMA completion).
146 *
147 * POLLOUT is asserted if there is room on the send queue. This does not mean
148 * however, that the next sendmsg() call will succeed. If the application tries
149 * to send to a congested destination, the system call may still fail (and
150 * return ENOBUFS).
151 */
152static unsigned int rds_poll(struct file *file, struct socket *sock,
153 poll_table *wait)
154{
155 struct sock *sk = sock->sk;
156 struct rds_sock *rs = rds_sk_to_rs(sk);
157 unsigned int mask = 0;
158 unsigned long flags;
159
160 poll_wait(file, sk->sk_sleep, wait);
161
162 poll_wait(file, &rds_poll_waitq, wait);
163
164 read_lock_irqsave(&rs->rs_recv_lock, flags);
165 if (!rs->rs_cong_monitor) {
166 /* When a congestion map was updated, we signal POLLIN for
167 * "historical" reasons. Applications can also poll for
168 * WRBAND instead. */
169 if (rds_cong_updated_since(&rs->rs_cong_track))
170 mask |= (POLLIN | POLLRDNORM | POLLWRBAND);
171 } else {
172 spin_lock(&rs->rs_lock);
173 if (rs->rs_cong_notify)
174 mask |= (POLLIN | POLLRDNORM);
175 spin_unlock(&rs->rs_lock);
176 }
177 if (!list_empty(&rs->rs_recv_queue)
178 || !list_empty(&rs->rs_notify_queue))
179 mask |= (POLLIN | POLLRDNORM);
180 if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
181 mask |= (POLLOUT | POLLWRNORM);
182 read_unlock_irqrestore(&rs->rs_recv_lock, flags);
183
184 return mask;
185}
186
187static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
188{
189 return -ENOIOCTLCMD;
190}
191
192static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
193 int len)
194{
195 struct sockaddr_in sin;
196 int ret = 0;
197
198 /* racing with another thread binding seems ok here */
199 if (rs->rs_bound_addr == 0) {
200 ret = -ENOTCONN; /* XXX not a great errno */
201 goto out;
202 }
203
204 if (len < sizeof(struct sockaddr_in)) {
205 ret = -EINVAL;
206 goto out;
207 }
208
209 if (copy_from_user(&sin, optval, sizeof(sin))) {
210 ret = -EFAULT;
211 goto out;
212 }
213
214 rds_send_drop_to(rs, &sin);
215out:
216 return ret;
217}
218
219static int rds_set_bool_option(unsigned char *optvar, char __user *optval,
220 int optlen)
221{
222 int value;
223
224 if (optlen < sizeof(int))
225 return -EINVAL;
226 if (get_user(value, (int __user *) optval))
227 return -EFAULT;
228 *optvar = !!value;
229 return 0;
230}
231
232static int rds_cong_monitor(struct rds_sock *rs, char __user *optval,
233 int optlen)
234{
235 int ret;
236
237 ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
238 if (ret == 0) {
239 if (rs->rs_cong_monitor) {
240 rds_cong_add_socket(rs);
241 } else {
242 rds_cong_remove_socket(rs);
243 rs->rs_cong_mask = 0;
244 rs->rs_cong_notify = 0;
245 }
246 }
247 return ret;
248}
249
250static int rds_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700251 char __user *optval, unsigned int optlen)
Andy Grover639b3212009-02-24 15:30:18 +0000252{
253 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
254 int ret;
255
256 if (level != SOL_RDS) {
257 ret = -ENOPROTOOPT;
258 goto out;
259 }
260
261 switch (optname) {
262 case RDS_CANCEL_SENT_TO:
263 ret = rds_cancel_sent_to(rs, optval, optlen);
264 break;
265 case RDS_GET_MR:
266 ret = rds_get_mr(rs, optval, optlen);
267 break;
268 case RDS_FREE_MR:
269 ret = rds_free_mr(rs, optval, optlen);
270 break;
271 case RDS_RECVERR:
272 ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
273 break;
274 case RDS_CONG_MONITOR:
275 ret = rds_cong_monitor(rs, optval, optlen);
276 break;
277 default:
278 ret = -ENOPROTOOPT;
279 }
280out:
281 return ret;
282}
283
284static int rds_getsockopt(struct socket *sock, int level, int optname,
285 char __user *optval, int __user *optlen)
286{
287 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
288 int ret = -ENOPROTOOPT, len;
289
290 if (level != SOL_RDS)
291 goto out;
292
293 if (get_user(len, optlen)) {
294 ret = -EFAULT;
295 goto out;
296 }
297
298 switch (optname) {
299 case RDS_INFO_FIRST ... RDS_INFO_LAST:
300 ret = rds_info_getsockopt(sock, optname, optval,
301 optlen);
302 break;
303
304 case RDS_RECVERR:
305 if (len < sizeof(int))
306 ret = -EINVAL;
307 else
308 if (put_user(rs->rs_recverr, (int __user *) optval)
309 || put_user(sizeof(int), optlen))
310 ret = -EFAULT;
311 else
312 ret = 0;
313 break;
314 default:
315 break;
316 }
317
318out:
319 return ret;
320
321}
322
323static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
324 int addr_len, int flags)
325{
326 struct sock *sk = sock->sk;
327 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
328 struct rds_sock *rs = rds_sk_to_rs(sk);
329 int ret = 0;
330
331 lock_sock(sk);
332
333 if (addr_len != sizeof(struct sockaddr_in)) {
334 ret = -EINVAL;
335 goto out;
336 }
337
338 if (sin->sin_family != AF_INET) {
339 ret = -EAFNOSUPPORT;
340 goto out;
341 }
342
343 if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
344 ret = -EDESTADDRREQ;
345 goto out;
346 }
347
348 rs->rs_conn_addr = sin->sin_addr.s_addr;
349 rs->rs_conn_port = sin->sin_port;
350
351out:
352 release_sock(sk);
353 return ret;
354}
355
356static struct proto rds_proto = {
357 .name = "RDS",
358 .owner = THIS_MODULE,
359 .obj_size = sizeof(struct rds_sock),
360};
361
Alexey Dobriyan5708e862009-09-14 12:23:23 +0000362static const struct proto_ops rds_proto_ops = {
Andy Grover639b3212009-02-24 15:30:18 +0000363 .family = AF_RDS,
364 .owner = THIS_MODULE,
365 .release = rds_release,
366 .bind = rds_bind,
367 .connect = rds_connect,
368 .socketpair = sock_no_socketpair,
369 .accept = sock_no_accept,
370 .getname = rds_getname,
371 .poll = rds_poll,
372 .ioctl = rds_ioctl,
373 .listen = sock_no_listen,
374 .shutdown = sock_no_shutdown,
375 .setsockopt = rds_setsockopt,
376 .getsockopt = rds_getsockopt,
377 .sendmsg = rds_sendmsg,
378 .recvmsg = rds_recvmsg,
379 .mmap = sock_no_mmap,
380 .sendpage = sock_no_sendpage,
381};
382
383static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
384{
385 unsigned long flags;
386 struct rds_sock *rs;
387
388 sock_init_data(sock, sk);
389 sock->ops = &rds_proto_ops;
390 sk->sk_protocol = protocol;
391
392 rs = rds_sk_to_rs(sk);
393 spin_lock_init(&rs->rs_lock);
394 rwlock_init(&rs->rs_recv_lock);
395 INIT_LIST_HEAD(&rs->rs_send_queue);
396 INIT_LIST_HEAD(&rs->rs_recv_queue);
397 INIT_LIST_HEAD(&rs->rs_notify_queue);
398 INIT_LIST_HEAD(&rs->rs_cong_list);
399 spin_lock_init(&rs->rs_rdma_lock);
400 rs->rs_rdma_keys = RB_ROOT;
401
402 spin_lock_irqsave(&rds_sock_lock, flags);
403 list_add_tail(&rs->rs_item, &rds_sock_list);
404 rds_sock_count++;
405 spin_unlock_irqrestore(&rds_sock_lock, flags);
406
407 return 0;
408}
409
410static int rds_create(struct net *net, struct socket *sock, int protocol)
411{
412 struct sock *sk;
413
414 if (sock->type != SOCK_SEQPACKET || protocol)
415 return -ESOCKTNOSUPPORT;
416
417 sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto);
418 if (!sk)
419 return -ENOMEM;
420
421 return __rds_create(sock, sk, protocol);
422}
423
424void rds_sock_addref(struct rds_sock *rs)
425{
426 sock_hold(rds_rs_to_sk(rs));
427}
428
429void rds_sock_put(struct rds_sock *rs)
430{
431 sock_put(rds_rs_to_sk(rs));
432}
433
434static struct net_proto_family rds_family_ops = {
435 .family = AF_RDS,
436 .create = rds_create,
437 .owner = THIS_MODULE,
438};
439
440static void rds_sock_inc_info(struct socket *sock, unsigned int len,
441 struct rds_info_iterator *iter,
442 struct rds_info_lengths *lens)
443{
444 struct rds_sock *rs;
445 struct sock *sk;
446 struct rds_incoming *inc;
447 unsigned long flags;
448 unsigned int total = 0;
449
450 len /= sizeof(struct rds_info_message);
451
452 spin_lock_irqsave(&rds_sock_lock, flags);
453
454 list_for_each_entry(rs, &rds_sock_list, rs_item) {
455 sk = rds_rs_to_sk(rs);
456 read_lock(&rs->rs_recv_lock);
457
458 /* XXX too lazy to maintain counts.. */
459 list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
460 total++;
461 if (total <= len)
462 rds_inc_info_copy(inc, iter, inc->i_saddr,
463 rs->rs_bound_addr, 1);
464 }
465
466 read_unlock(&rs->rs_recv_lock);
467 }
468
469 spin_unlock_irqrestore(&rds_sock_lock, flags);
470
471 lens->nr = total;
472 lens->each = sizeof(struct rds_info_message);
473}
474
475static void rds_sock_info(struct socket *sock, unsigned int len,
476 struct rds_info_iterator *iter,
477 struct rds_info_lengths *lens)
478{
479 struct rds_info_socket sinfo;
480 struct rds_sock *rs;
481 unsigned long flags;
482
483 len /= sizeof(struct rds_info_socket);
484
485 spin_lock_irqsave(&rds_sock_lock, flags);
486
487 if (len < rds_sock_count)
488 goto out;
489
490 list_for_each_entry(rs, &rds_sock_list, rs_item) {
491 sinfo.sndbuf = rds_sk_sndbuf(rs);
492 sinfo.rcvbuf = rds_sk_rcvbuf(rs);
493 sinfo.bound_addr = rs->rs_bound_addr;
494 sinfo.connected_addr = rs->rs_conn_addr;
495 sinfo.bound_port = rs->rs_bound_port;
496 sinfo.connected_port = rs->rs_conn_port;
497 sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
498
499 rds_info_copy(iter, &sinfo, sizeof(sinfo));
500 }
501
502out:
503 lens->nr = rds_sock_count;
504 lens->each = sizeof(struct rds_info_socket);
505
506 spin_unlock_irqrestore(&rds_sock_lock, flags);
507}
508
509static void __exit rds_exit(void)
510{
Andy Grover639b3212009-02-24 15:30:18 +0000511 sock_unregister(rds_family_ops.family);
512 proto_unregister(&rds_proto);
513 rds_conn_exit();
514 rds_cong_exit();
515 rds_sysctl_exit();
516 rds_threads_exit();
517 rds_stats_exit();
518 rds_page_exit();
519 rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
520 rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
521}
522module_exit(rds_exit);
523
524static int __init rds_init(void)
525{
526 int ret;
527
528 ret = rds_conn_init();
529 if (ret)
530 goto out;
531 ret = rds_threads_init();
532 if (ret)
533 goto out_conn;
534 ret = rds_sysctl_init();
535 if (ret)
536 goto out_threads;
537 ret = rds_stats_init();
538 if (ret)
539 goto out_sysctl;
540 ret = proto_register(&rds_proto, 1);
541 if (ret)
542 goto out_stats;
543 ret = sock_register(&rds_family_ops);
544 if (ret)
545 goto out_proto;
546
547 rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
548 rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
549
Andy Grover639b3212009-02-24 15:30:18 +0000550 goto out;
551
Andy Grover639b3212009-02-24 15:30:18 +0000552out_proto:
553 proto_unregister(&rds_proto);
554out_stats:
555 rds_stats_exit();
556out_sysctl:
557 rds_sysctl_exit();
558out_threads:
559 rds_threads_exit();
560out_conn:
561 rds_conn_exit();
562 rds_cong_exit();
563 rds_page_exit();
564out:
565 return ret;
566}
567module_init(rds_init);
568
569#define DRV_VERSION "4.0"
570#define DRV_RELDATE "Feb 12, 2009"
571
572MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
573MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
574 " v" DRV_VERSION " (" DRV_RELDATE ")");
575MODULE_VERSION(DRV_VERSION);
576MODULE_LICENSE("Dual BSD/GPL");
577MODULE_ALIAS_NETPROTO(PF_RDS);