2 * Copyright (c) 2006 Oracle. All rights reserved.
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <linux/kernel.h>
40 void rds_tcp_state_change(struct sock *sk)
42 void (*state_change)(struct sock *sk);
43 struct rds_conn_path *cp;
44 struct rds_tcp_connection *tc;
46 read_lock_bh(&sk->sk_callback_lock);
47 cp = sk->sk_user_data;
49 state_change = sk->sk_state_change;
52 tc = cp->cp_transport_data;
53 state_change = tc->t_orig_state_change;
55 rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state);
57 switch (sk->sk_state) {
58 /* ignore connecting sockets as they make progress */
63 /* Force the peer to reconnect so that we have the
64 * TCP ports going from <smaller-ip>.<transient> to
65 * <larger-ip>.<RDS_TCP_PORT>. We avoid marking the
66 * RDS connection as RDS_CONN_UP until the reconnect,
67 * to avoid RDS datagram loss.
69 if (cp->cp_conn->c_laddr > cp->cp_conn->c_faddr &&
70 rds_conn_path_transition(cp, RDS_CONN_CONNECTING,
72 rds_conn_path_drop(cp);
74 rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
79 rds_conn_path_drop(cp);
84 read_unlock_bh(&sk->sk_callback_lock);
88 int rds_tcp_conn_path_connect(struct rds_conn_path *cp)
90 struct socket *sock = NULL;
91 struct sockaddr_in src, dest;
93 struct rds_connection *conn = cp->cp_conn;
94 struct rds_tcp_connection *tc = cp->cp_transport_data;
96 /* for multipath rds,we only trigger the connection after
97 * the handshake probe has determined the number of paths.
99 if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2)
102 mutex_lock(&tc->t_conn_path_lock);
104 if (rds_conn_path_up(cp)) {
105 mutex_unlock(&tc->t_conn_path_lock);
108 ret = sock_create_kern(rds_conn_net(conn), PF_INET,
109 SOCK_STREAM, IPPROTO_TCP, &sock);
115 src.sin_family = AF_INET;
116 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
117 src.sin_port = (__force u16)htons(0);
119 ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
121 rdsdebug("bind failed with %d at address %pI4\n",
122 ret, &conn->c_laddr);
126 dest.sin_family = AF_INET;
127 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
128 dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
131 * once we call connect() we can start getting callbacks and they
134 rds_tcp_set_callbacks(sock, cp);
135 ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
138 rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
139 if (ret == -EINPROGRESS)
142 rds_tcp_keepalive(sock);
145 rds_tcp_restore_callbacks(sock, cp->cp_transport_data);
149 mutex_unlock(&tc->t_conn_path_lock);
156 * Before killing the tcp socket this needs to serialize with callbacks. The
157 * caller has already grabbed the sending sem so we're serialized with other
160 * TCP calls the callbacks with the sock lock so we hold it while we reset the
161 * callbacks to those set by TCP. Our callbacks won't execute again once we
162 * hold the sock lock.
164 void rds_tcp_conn_path_shutdown(struct rds_conn_path *cp)
166 struct rds_tcp_connection *tc = cp->cp_transport_data;
167 struct socket *sock = tc->t_sock;
169 rdsdebug("shutting down conn %p tc %p sock %p\n",
170 cp->cp_conn, tc, sock);
173 sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
175 rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
177 release_sock(sock->sk);
182 rds_inc_put(&tc->t_tinc->ti_inc);
185 tc->t_tinc_hdr_rem = sizeof(struct rds_header);
186 tc->t_tinc_data_rem = 0;