cregit-Linux how code gets into the kernel

Release 4.11 net/rds/tcp_connect.c

Directory: net/rds
/*
 * 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_conn_path *cp; struct rds_tcp_connection *tc; read_lock_bh(&sk->sk_callback_lock); cp = sk->sk_user_data; if (!cp) { state_change = sk->sk_state_change; goto out; } tc = cp->cp_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: /* Force the peer to reconnect so that we have the * TCP ports going from <smaller-ip>.<transient> to * <larger-ip>.<RDS_TCP_PORT>. We avoid marking the * RDS connection as RDS_CONN_UP until the reconnect, * to avoid RDS datagram loss. */ if (cp->cp_conn->c_laddr > cp->cp_conn->c_faddr && rds_conn_path_transition(cp, RDS_CONN_CONNECTING, RDS_CONN_ERROR)) { rds_conn_path_drop(cp); } else { rds_connect_path_complete(cp, RDS_CONN_CONNECTING); } break; case TCP_CLOSE_WAIT: case TCP_CLOSE: rds_conn_path_drop(cp); default: break; } out: read_unlock_bh(&sk->sk_callback_lock); state_change(sk); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover12571.02%228.57%
Sowmini Varadhan4927.84%457.14%
Eric Dumazet21.14%114.29%
Total176100.00%7100.00%


int rds_tcp_conn_path_connect(struct rds_conn_path *cp) { struct socket *sock = NULL; struct sockaddr_in src, dest; int ret; struct rds_connection *conn = cp->cp_conn; struct rds_tcp_connection *tc = cp->cp_transport_data; /* for multipath rds,we only trigger the connection after * the handshake probe has determined the number of paths. */ if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2) return -EAGAIN; mutex_lock(&tc->t_conn_path_lock); if (rds_conn_path_up(cp)) { mutex_unlock(&tc->t_conn_path_lock); return 0; } ret = sock_create_kern(rds_conn_net(conn), 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, cp); ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest), O_NONBLOCK); cp->cp_outgoing = 1; rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret); if (ret == -EINPROGRESS) ret = 0; if (ret == 0) { rds_tcp_keepalive(sock); sock = NULL; } else { rds_tcp_restore_callbacks(sock, cp->cp_transport_data); } out: mutex_unlock(&tc->t_conn_path_lock); if (sock) sock_release(sock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover22764.67%110.00%
Sowmini Varadhan10229.06%770.00%
Herton Ronaldo Krzesinski185.13%110.00%
Joe Perches41.14%110.00%
Total351100.00%10100.00%

/* * 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_path_shutdown(struct rds_conn_path *cp) { struct rds_tcp_connection *tc = cp->cp_transport_data; struct socket *sock = tc->t_sock; rdsdebug("shutting down conn %p tc %p sock %p\n", cp->cp_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; }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover11993.70%150.00%
Sowmini Varadhan86.30%150.00%
Total127100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Andy Grover48872.73%212.50%
Sowmini Varadhan15923.70%1168.75%
Herton Ronaldo Krzesinski182.68%16.25%
Joe Perches40.60%16.25%
Eric Dumazet20.30%16.25%
Total671100.00%16100.00%
Directory: net/rds
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