tcp_connect.rar_progress

/* * Copyright (c) 2006 Oracle. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * */ #include <linux/kernel.h> #include <linux/in.h> #include <net/tcp.h> #include "rds.h" #include "tcp.h" void rds_tcp_state_change(struct sock *sk) { void (*state_change)(struct sock *sk); struct rds_connection *conn; struct rds_tcp_connection *tc; read_lock(&sk->sk_callback_lock); conn = sk->sk_user_data; if (!conn) { state_change = sk->sk_state_change; goto out; } tc = conn->c_transport_data; state_change = tc->t_orig_state_change; rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state); switch(sk->sk_state) { /* ignore connecting sockets as they make progress */ case TCP_SYN_SENT: case TCP_SYN_RECV: break; case TCP_ESTABLISHED: rds_connect_complete(conn); break; case TCP_CLOSE: rds_conn_drop(conn); default: break; } out: read_unlock(&sk->sk_callback_lock); state_change(sk); } int rds_tcp_conn_connect(struct rds_connection *conn) { struct socket *sock = NULL; struct sockaddr_in src, dest; int ret; ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); if (ret < 0) goto out; rds_tcp_tune(sock); src.sin_family = AF_INET; src.sin_addr.s_addr = (__force u32)conn->c_laddr; src.sin_port = (__force u16)htons(0); ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src)); if (ret) { rdsdebug("bind failed with %d at address %pI4\n", ret, &conn->c_laddr); goto out; } dest.sin_family = AF_INET; dest.sin_addr.s_addr = (__force u32)conn->c_faddr; dest.sin_port = (__force u16)htons(RDS_TCP_PORT); /* * once we call connect() we can start getting callbacks and they * own the socket */ rds_tcp_set_callbacks(sock, conn); ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest), O_NONBLOCK); rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret); if (ret == -EINPROGRESS) ret = 0; if (ret == 0) sock = NULL; else rds_tcp_restore_callbacks(sock, conn->c_transport_data); out: if (sock) sock_release(sock); return ret; } /* * Before killing the tcp socket this needs to serialize with callbacks. The * caller has already grabbed the sending sem so we're serialized with other * senders. * * TCP calls the callbacks with the sock lock so we hold it while we reset the * callbacks to those set by TCP. Our callbacks won't execute again once we * hold the sock lock. */ void rds_tcp_conn_shutdown(struct rds_connection *conn) { struct rds_tcp_connection *tc = conn->c_transport_data; struct socket *sock = tc->t_sock; rdsdebug("shutting down conn %p tc %p sock %p\n", conn, tc, sock); if (sock) { sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN); lock_sock(sock->sk); rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */ release_sock(sock->sk); sock_release(sock); } if (tc->t_tinc) { rds_inc_put(&tc->t_tinc->ti_inc); tc->t_tinc = NULL; } tc->t_tinc_hdr_rem = sizeof(struct rds_header); tc->t_tinc_data_rem = 0; }