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70041088 AG |
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> | |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
70041088 AG |
35 | #include <linux/in.h> |
36 | #include <net/tcp.h> | |
37 | ||
38 | #include "rds.h" | |
39 | #include "tcp.h" | |
40 | ||
41 | /* | |
42 | * cheesy, but simple.. | |
43 | */ | |
44 | static void rds_tcp_accept_worker(struct work_struct *work); | |
45 | static DECLARE_WORK(rds_tcp_listen_work, rds_tcp_accept_worker); | |
46 | static struct socket *rds_tcp_listen_sock; | |
47 | ||
48 | static int rds_tcp_accept_one(struct socket *sock) | |
49 | { | |
50 | struct socket *new_sock = NULL; | |
51 | struct rds_connection *conn; | |
52 | int ret; | |
53 | struct inet_sock *inet; | |
54 | ||
55 | ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, | |
56 | sock->sk->sk_protocol, &new_sock); | |
57 | if (ret) | |
58 | goto out; | |
59 | ||
60 | new_sock->type = sock->type; | |
61 | new_sock->ops = sock->ops; | |
62 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); | |
63 | if (ret < 0) | |
64 | goto out; | |
65 | ||
66 | rds_tcp_tune(new_sock); | |
67 | ||
68 | inet = inet_sk(new_sock->sk); | |
69 | ||
6884b348 JP |
70 | rdsdebug("accepted tcp %pI4:%u -> %pI4:%u\n", |
71 | &inet->inet_saddr, ntohs(inet->inet_sport), | |
72 | &inet->inet_daddr, ntohs(inet->inet_dport)); | |
70041088 | 73 | |
c720c7e8 ED |
74 | conn = rds_conn_create(inet->inet_saddr, inet->inet_daddr, |
75 | &rds_tcp_transport, GFP_KERNEL); | |
70041088 AG |
76 | if (IS_ERR(conn)) { |
77 | ret = PTR_ERR(conn); | |
78 | goto out; | |
79 | } | |
80 | ||
81 | /* | |
82 | * see the comment above rds_queue_delayed_reconnect() | |
83 | */ | |
84 | if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { | |
85 | if (rds_conn_state(conn) == RDS_CONN_UP) | |
86 | rds_tcp_stats_inc(s_tcp_listen_closed_stale); | |
87 | else | |
88 | rds_tcp_stats_inc(s_tcp_connect_raced); | |
89 | rds_conn_drop(conn); | |
90 | ret = 0; | |
91 | goto out; | |
92 | } | |
93 | ||
94 | rds_tcp_set_callbacks(new_sock, conn); | |
95 | rds_connect_complete(conn); | |
96 | new_sock = NULL; | |
97 | ret = 0; | |
98 | ||
99 | out: | |
100 | if (new_sock) | |
101 | sock_release(new_sock); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | static void rds_tcp_accept_worker(struct work_struct *work) | |
106 | { | |
107 | while (rds_tcp_accept_one(rds_tcp_listen_sock) == 0) | |
108 | cond_resched(); | |
109 | } | |
110 | ||
676d2369 | 111 | void rds_tcp_listen_data_ready(struct sock *sk) |
70041088 | 112 | { |
676d2369 | 113 | void (*ready)(struct sock *sk); |
70041088 AG |
114 | |
115 | rdsdebug("listen data ready sk %p\n", sk); | |
116 | ||
bfdc587c | 117 | read_lock(&sk->sk_callback_lock); |
70041088 | 118 | ready = sk->sk_user_data; |
8690bfa1 | 119 | if (!ready) { /* check for teardown race */ |
70041088 AG |
120 | ready = sk->sk_data_ready; |
121 | goto out; | |
122 | } | |
123 | ||
124 | /* | |
125 | * ->sk_data_ready is also called for a newly established child socket | |
126 | * before it has been accepted and the accepter has set up their | |
127 | * data_ready.. we only want to queue listen work for our listening | |
128 | * socket | |
129 | */ | |
130 | if (sk->sk_state == TCP_LISTEN) | |
131 | queue_work(rds_wq, &rds_tcp_listen_work); | |
132 | ||
133 | out: | |
bfdc587c | 134 | read_unlock(&sk->sk_callback_lock); |
676d2369 | 135 | ready(sk); |
70041088 AG |
136 | } |
137 | ||
ef87b7ea | 138 | int rds_tcp_listen_init(void) |
70041088 AG |
139 | { |
140 | struct sockaddr_in sin; | |
141 | struct socket *sock = NULL; | |
142 | int ret; | |
143 | ||
144 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
145 | if (ret < 0) | |
146 | goto out; | |
147 | ||
4a17fd52 | 148 | sock->sk->sk_reuse = SK_CAN_REUSE; |
70041088 AG |
149 | rds_tcp_nonagle(sock); |
150 | ||
151 | write_lock_bh(&sock->sk->sk_callback_lock); | |
152 | sock->sk->sk_user_data = sock->sk->sk_data_ready; | |
153 | sock->sk->sk_data_ready = rds_tcp_listen_data_ready; | |
154 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
155 | ||
01728371 | 156 | sin.sin_family = PF_INET; |
70041088 AG |
157 | sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); |
158 | sin.sin_port = (__force u16)htons(RDS_TCP_PORT); | |
159 | ||
160 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); | |
161 | if (ret < 0) | |
162 | goto out; | |
163 | ||
164 | ret = sock->ops->listen(sock, 64); | |
165 | if (ret < 0) | |
166 | goto out; | |
167 | ||
168 | rds_tcp_listen_sock = sock; | |
169 | sock = NULL; | |
170 | out: | |
171 | if (sock) | |
172 | sock_release(sock); | |
173 | return ret; | |
174 | } | |
175 | ||
176 | void rds_tcp_listen_stop(void) | |
177 | { | |
178 | struct socket *sock = rds_tcp_listen_sock; | |
179 | struct sock *sk; | |
180 | ||
8690bfa1 | 181 | if (!sock) |
70041088 AG |
182 | return; |
183 | ||
184 | sk = sock->sk; | |
185 | ||
186 | /* serialize with and prevent further callbacks */ | |
187 | lock_sock(sk); | |
188 | write_lock_bh(&sk->sk_callback_lock); | |
189 | if (sk->sk_user_data) { | |
190 | sk->sk_data_ready = sk->sk_user_data; | |
191 | sk->sk_user_data = NULL; | |
192 | } | |
193 | write_unlock_bh(&sk->sk_callback_lock); | |
194 | release_sock(sk); | |
195 | ||
196 | /* wait for accepts to stop and close the socket */ | |
197 | flush_workqueue(rds_wq); | |
198 | sock_release(sock); | |
199 | rds_tcp_listen_sock = NULL; | |
200 | } |