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![Ying Xue](/assets/img/avatar_default.png)
Since we have already in BH context when *_write_space(), *_data_ready() as well as *_state_change() are called, it's unnecessary to disable BH. Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
200 lines
5.1 KiB
C
200 lines
5.1 KiB
C
/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/gfp.h>
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#include <linux/in.h>
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#include <net/tcp.h>
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#include "rds.h"
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#include "tcp.h"
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/*
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* cheesy, but simple..
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*/
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static void rds_tcp_accept_worker(struct work_struct *work);
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static DECLARE_WORK(rds_tcp_listen_work, rds_tcp_accept_worker);
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static struct socket *rds_tcp_listen_sock;
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static int rds_tcp_accept_one(struct socket *sock)
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{
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struct socket *new_sock = NULL;
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struct rds_connection *conn;
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int ret;
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struct inet_sock *inet;
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ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
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sock->sk->sk_protocol, &new_sock);
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if (ret)
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goto out;
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new_sock->type = sock->type;
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new_sock->ops = sock->ops;
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ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
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if (ret < 0)
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goto out;
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rds_tcp_tune(new_sock);
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inet = inet_sk(new_sock->sk);
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rdsdebug("accepted tcp %pI4:%u -> %pI4:%u\n",
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&inet->inet_saddr, ntohs(inet->inet_sport),
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&inet->inet_daddr, ntohs(inet->inet_dport));
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conn = rds_conn_create(inet->inet_saddr, inet->inet_daddr,
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&rds_tcp_transport, GFP_KERNEL);
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if (IS_ERR(conn)) {
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ret = PTR_ERR(conn);
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goto out;
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}
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/*
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* see the comment above rds_queue_delayed_reconnect()
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*/
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if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
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if (rds_conn_state(conn) == RDS_CONN_UP)
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rds_tcp_stats_inc(s_tcp_listen_closed_stale);
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else
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rds_tcp_stats_inc(s_tcp_connect_raced);
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rds_conn_drop(conn);
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ret = 0;
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goto out;
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}
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rds_tcp_set_callbacks(new_sock, conn);
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rds_connect_complete(conn);
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new_sock = NULL;
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ret = 0;
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out:
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if (new_sock)
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sock_release(new_sock);
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return ret;
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}
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static void rds_tcp_accept_worker(struct work_struct *work)
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{
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while (rds_tcp_accept_one(rds_tcp_listen_sock) == 0)
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cond_resched();
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}
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void rds_tcp_listen_data_ready(struct sock *sk, int bytes)
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{
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void (*ready)(struct sock *sk, int bytes);
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rdsdebug("listen data ready sk %p\n", sk);
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read_lock(&sk->sk_callback_lock);
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ready = sk->sk_user_data;
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if (!ready) { /* check for teardown race */
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ready = sk->sk_data_ready;
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goto out;
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}
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/*
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* ->sk_data_ready is also called for a newly established child socket
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* before it has been accepted and the accepter has set up their
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* data_ready.. we only want to queue listen work for our listening
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* socket
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*/
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if (sk->sk_state == TCP_LISTEN)
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queue_work(rds_wq, &rds_tcp_listen_work);
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out:
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read_unlock(&sk->sk_callback_lock);
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ready(sk, bytes);
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}
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int rds_tcp_listen_init(void)
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{
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struct sockaddr_in sin;
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struct socket *sock = NULL;
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int ret;
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ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
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if (ret < 0)
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goto out;
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sock->sk->sk_reuse = SK_CAN_REUSE;
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rds_tcp_nonagle(sock);
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write_lock_bh(&sock->sk->sk_callback_lock);
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sock->sk->sk_user_data = sock->sk->sk_data_ready;
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sock->sk->sk_data_ready = rds_tcp_listen_data_ready;
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write_unlock_bh(&sock->sk->sk_callback_lock);
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sin.sin_family = PF_INET,
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sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
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sin.sin_port = (__force u16)htons(RDS_TCP_PORT);
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ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
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if (ret < 0)
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goto out;
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ret = sock->ops->listen(sock, 64);
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if (ret < 0)
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goto out;
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rds_tcp_listen_sock = sock;
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sock = NULL;
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out:
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if (sock)
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sock_release(sock);
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return ret;
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}
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void rds_tcp_listen_stop(void)
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{
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struct socket *sock = rds_tcp_listen_sock;
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struct sock *sk;
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if (!sock)
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return;
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sk = sock->sk;
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/* serialize with and prevent further callbacks */
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lock_sock(sk);
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write_lock_bh(&sk->sk_callback_lock);
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if (sk->sk_user_data) {
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sk->sk_data_ready = sk->sk_user_data;
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sk->sk_user_data = NULL;
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}
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write_unlock_bh(&sk->sk_callback_lock);
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release_sock(sk);
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/* wait for accepts to stop and close the socket */
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flush_workqueue(rds_wq);
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sock_release(sock);
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rds_tcp_listen_sock = NULL;
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}
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