Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[profile/ivi/kernel-adaptation-intel-automotive.git] / net / rds / tcp.c
1 /*
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/kernel.h>
34 #include <linux/slab.h>
35 #include <linux/in.h>
36 #include <linux/module.h>
37 #include <net/tcp.h>
38
39 #include "rds.h"
40 #include "tcp.h"
41
42 /* only for info exporting */
43 static DEFINE_SPINLOCK(rds_tcp_tc_list_lock);
44 static LIST_HEAD(rds_tcp_tc_list);
45 static unsigned int rds_tcp_tc_count;
46
47 /* Track rds_tcp_connection structs so they can be cleaned up */
48 static DEFINE_SPINLOCK(rds_tcp_conn_lock);
49 static LIST_HEAD(rds_tcp_conn_list);
50
51 static struct kmem_cache *rds_tcp_conn_slab;
52
53 #define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024)
54
55 /* doing it this way avoids calling tcp_sk() */
56 void rds_tcp_nonagle(struct socket *sock)
57 {
58         mm_segment_t oldfs = get_fs();
59         int val = 1;
60
61         set_fs(KERNEL_DS);
62         sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val,
63                               sizeof(val));
64         set_fs(oldfs);
65 }
66
67 void rds_tcp_tune(struct socket *sock)
68 {
69         struct sock *sk = sock->sk;
70
71         rds_tcp_nonagle(sock);
72
73         /*
74          * We're trying to saturate gigabit with the default,
75          * see svc_sock_setbufsize().
76          */
77         lock_sock(sk);
78         sk->sk_sndbuf = RDS_TCP_DEFAULT_BUFSIZE;
79         sk->sk_rcvbuf = RDS_TCP_DEFAULT_BUFSIZE;
80         sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
81         release_sock(sk);
82 }
83
84 u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc)
85 {
86         return tcp_sk(tc->t_sock->sk)->snd_nxt;
87 }
88
89 u32 rds_tcp_snd_una(struct rds_tcp_connection *tc)
90 {
91         return tcp_sk(tc->t_sock->sk)->snd_una;
92 }
93
94 void rds_tcp_restore_callbacks(struct socket *sock,
95                                struct rds_tcp_connection *tc)
96 {
97         rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc);
98         write_lock_bh(&sock->sk->sk_callback_lock);
99
100         /* done under the callback_lock to serialize with write_space */
101         spin_lock(&rds_tcp_tc_list_lock);
102         list_del_init(&tc->t_list_item);
103         rds_tcp_tc_count--;
104         spin_unlock(&rds_tcp_tc_list_lock);
105
106         tc->t_sock = NULL;
107
108         sock->sk->sk_write_space = tc->t_orig_write_space;
109         sock->sk->sk_data_ready = tc->t_orig_data_ready;
110         sock->sk->sk_state_change = tc->t_orig_state_change;
111         sock->sk->sk_user_data = NULL;
112
113         write_unlock_bh(&sock->sk->sk_callback_lock);
114 }
115
116 /*
117  * This is the only path that sets tc->t_sock.  Send and receive trust that
118  * it is set.  The RDS_CONN_CONNECTED bit protects those paths from being
119  * called while it isn't set.
120  */
121 void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn)
122 {
123         struct rds_tcp_connection *tc = conn->c_transport_data;
124
125         rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc);
126         write_lock_bh(&sock->sk->sk_callback_lock);
127
128         /* done under the callback_lock to serialize with write_space */
129         spin_lock(&rds_tcp_tc_list_lock);
130         list_add_tail(&tc->t_list_item, &rds_tcp_tc_list);
131         rds_tcp_tc_count++;
132         spin_unlock(&rds_tcp_tc_list_lock);
133
134         /* accepted sockets need our listen data ready undone */
135         if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready)
136                 sock->sk->sk_data_ready = sock->sk->sk_user_data;
137
138         tc->t_sock = sock;
139         tc->conn = conn;
140         tc->t_orig_data_ready = sock->sk->sk_data_ready;
141         tc->t_orig_write_space = sock->sk->sk_write_space;
142         tc->t_orig_state_change = sock->sk->sk_state_change;
143
144         sock->sk->sk_user_data = conn;
145         sock->sk->sk_data_ready = rds_tcp_data_ready;
146         sock->sk->sk_write_space = rds_tcp_write_space;
147         sock->sk->sk_state_change = rds_tcp_state_change;
148
149         write_unlock_bh(&sock->sk->sk_callback_lock);
150 }
151
152 static void rds_tcp_tc_info(struct socket *sock, unsigned int len,
153                             struct rds_info_iterator *iter,
154                             struct rds_info_lengths *lens)
155 {
156         struct rds_info_tcp_socket tsinfo;
157         struct rds_tcp_connection *tc;
158         unsigned long flags;
159         struct sockaddr_in sin;
160         int sinlen;
161
162         spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
163
164         if (len / sizeof(tsinfo) < rds_tcp_tc_count)
165                 goto out;
166
167         list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
168
169                 sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0);
170                 tsinfo.local_addr = sin.sin_addr.s_addr;
171                 tsinfo.local_port = sin.sin_port;
172                 sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1);
173                 tsinfo.peer_addr = sin.sin_addr.s_addr;
174                 tsinfo.peer_port = sin.sin_port;
175
176                 tsinfo.hdr_rem = tc->t_tinc_hdr_rem;
177                 tsinfo.data_rem = tc->t_tinc_data_rem;
178                 tsinfo.last_sent_nxt = tc->t_last_sent_nxt;
179                 tsinfo.last_expected_una = tc->t_last_expected_una;
180                 tsinfo.last_seen_una = tc->t_last_seen_una;
181
182                 rds_info_copy(iter, &tsinfo, sizeof(tsinfo));
183         }
184
185 out:
186         lens->nr = rds_tcp_tc_count;
187         lens->each = sizeof(tsinfo);
188
189         spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
190 }
191
192 static int rds_tcp_laddr_check(__be32 addr)
193 {
194         if (inet_addr_type(&init_net, addr) == RTN_LOCAL)
195                 return 0;
196         return -EADDRNOTAVAIL;
197 }
198
199 static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
200 {
201         struct rds_tcp_connection *tc;
202
203         tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp);
204         if (!tc)
205                 return -ENOMEM;
206
207         tc->t_sock = NULL;
208         tc->t_tinc = NULL;
209         tc->t_tinc_hdr_rem = sizeof(struct rds_header);
210         tc->t_tinc_data_rem = 0;
211
212         conn->c_transport_data = tc;
213
214         spin_lock_irq(&rds_tcp_conn_lock);
215         list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
216         spin_unlock_irq(&rds_tcp_conn_lock);
217
218         rdsdebug("alloced tc %p\n", conn->c_transport_data);
219         return 0;
220 }
221
222 static void rds_tcp_conn_free(void *arg)
223 {
224         struct rds_tcp_connection *tc = arg;
225         unsigned long flags;
226         rdsdebug("freeing tc %p\n", tc);
227
228         spin_lock_irqsave(&rds_tcp_conn_lock, flags);
229         list_del(&tc->t_tcp_node);
230         spin_unlock_irqrestore(&rds_tcp_conn_lock, flags);
231
232         kmem_cache_free(rds_tcp_conn_slab, tc);
233 }
234
235 static void rds_tcp_destroy_conns(void)
236 {
237         struct rds_tcp_connection *tc, *_tc;
238         LIST_HEAD(tmp_list);
239
240         /* avoid calling conn_destroy with irqs off */
241         spin_lock_irq(&rds_tcp_conn_lock);
242         list_splice(&rds_tcp_conn_list, &tmp_list);
243         INIT_LIST_HEAD(&rds_tcp_conn_list);
244         spin_unlock_irq(&rds_tcp_conn_lock);
245
246         list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) {
247                 if (tc->conn->c_passive)
248                         rds_conn_destroy(tc->conn->c_passive);
249                 rds_conn_destroy(tc->conn);
250         }
251 }
252
253 static void rds_tcp_exit(void)
254 {
255         rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
256         rds_tcp_listen_stop();
257         rds_tcp_destroy_conns();
258         rds_trans_unregister(&rds_tcp_transport);
259         rds_tcp_recv_exit();
260         kmem_cache_destroy(rds_tcp_conn_slab);
261 }
262 module_exit(rds_tcp_exit);
263
264 struct rds_transport rds_tcp_transport = {
265         .laddr_check            = rds_tcp_laddr_check,
266         .xmit_prepare           = rds_tcp_xmit_prepare,
267         .xmit_complete          = rds_tcp_xmit_complete,
268         .xmit                   = rds_tcp_xmit,
269         .recv                   = rds_tcp_recv,
270         .conn_alloc             = rds_tcp_conn_alloc,
271         .conn_free              = rds_tcp_conn_free,
272         .conn_connect           = rds_tcp_conn_connect,
273         .conn_shutdown          = rds_tcp_conn_shutdown,
274         .inc_copy_to_user       = rds_tcp_inc_copy_to_user,
275         .inc_free               = rds_tcp_inc_free,
276         .stats_info_copy        = rds_tcp_stats_info_copy,
277         .exit                   = rds_tcp_exit,
278         .t_owner                = THIS_MODULE,
279         .t_name                 = "tcp",
280         .t_type                 = RDS_TRANS_TCP,
281         .t_prefer_loopback      = 1,
282 };
283
284 static int rds_tcp_init(void)
285 {
286         int ret;
287
288         rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection",
289                                               sizeof(struct rds_tcp_connection),
290                                               0, 0, NULL);
291         if (!rds_tcp_conn_slab) {
292                 ret = -ENOMEM;
293                 goto out;
294         }
295
296         ret = rds_tcp_recv_init();
297         if (ret)
298                 goto out_slab;
299
300         ret = rds_trans_register(&rds_tcp_transport);
301         if (ret)
302                 goto out_recv;
303
304         ret = rds_tcp_listen_init();
305         if (ret)
306                 goto out_register;
307
308         rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
309
310         goto out;
311
312 out_register:
313         rds_trans_unregister(&rds_tcp_transport);
314 out_recv:
315         rds_tcp_recv_exit();
316 out_slab:
317         kmem_cache_destroy(rds_tcp_conn_slab);
318 out:
319         return ret;
320 }
321 module_init(rds_tcp_init);
322
323 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
324 MODULE_DESCRIPTION("RDS: TCP transport");
325 MODULE_LICENSE("Dual BSD/GPL");
326