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| 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/gfp.h> |
| 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 | |
| 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)); |
| 73 | |
| 74 | conn = rds_conn_create(inet->inet_saddr, inet->inet_daddr, |
| 75 | &rds_tcp_transport, GFP_KERNEL); |
| 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 | |
| 111 | void rds_tcp_listen_data_ready(struct sock *sk, int bytes) |
| 112 | { |
| 113 | void (*ready)(struct sock *sk, int bytes); |
| 114 | |
| 115 | rdsdebug("listen data ready sk %p\n", sk); |
| 116 | |
| 117 | read_lock(&sk->sk_callback_lock); |
| 118 | ready = sk->sk_user_data; |
| 119 | if (ready == NULL) { /* check for teardown race */ |
| 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: |
| 134 | read_unlock(&sk->sk_callback_lock); |
| 135 | ready(sk, bytes); |
| 136 | } |
| 137 | |
| 138 | int __init rds_tcp_listen_init(void) |
| 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 | |
| 148 | sock->sk->sk_reuse = 1; |
| 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 | |
| 156 | sin.sin_family = PF_INET, |
| 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 | |
| 181 | if (sock == NULL) |
| 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 | } |
| 201 |
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Tags:
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v2.6.34-rc5
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