2 * Copyright (c) 2006 Oracle. All rights reserved.
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6 * General Public License (GPL) Version 2, available from the file
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8 * OpenIB.org BSD license below:
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11 * without modification, are permitted provided that the following
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15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
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21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <linux/kernel.h>
34 #include <linux/gfp.h>
42 * cheesy, but simple..
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;
48 static int rds_tcp_keepalive(struct socket *sock)
50 /* values below based on xs_udp_default_timeout */
51 int keepidle = 5; /* send a probe 'keepidle' secs after last data */
52 int keepcnt = 5; /* number of unack'ed probes before declaring dead */
56 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
57 (char *)&keepalive, sizeof(keepalive));
61 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT,
62 (char *)&keepcnt, sizeof(keepcnt));
66 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE,
67 (char *)&keepidle, sizeof(keepidle));
71 /* KEEPINTVL is the interval between successive probes. We follow
72 * the model in xs_tcp_finish_connecting() and re-use keepidle.
74 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL,
75 (char *)&keepidle, sizeof(keepidle));
80 static int rds_tcp_accept_one(struct socket *sock)
82 struct socket *new_sock = NULL;
83 struct rds_connection *conn;
85 struct inet_sock *inet;
86 struct rds_tcp_connection *rs_tcp;
88 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
89 sock->sk->sk_protocol, &new_sock);
93 new_sock->type = sock->type;
94 new_sock->ops = sock->ops;
95 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
99 ret = rds_tcp_keepalive(new_sock);
103 rds_tcp_tune(new_sock);
105 inet = inet_sk(new_sock->sk);
107 rdsdebug("accepted tcp %pI4:%u -> %pI4:%u\n",
108 &inet->inet_saddr, ntohs(inet->inet_sport),
109 &inet->inet_daddr, ntohs(inet->inet_dport));
111 conn = rds_conn_create(inet->inet_saddr, inet->inet_daddr,
112 &rds_tcp_transport, GFP_KERNEL);
117 /* An incoming SYN request came in, and TCP just accepted it.
118 * We always create a new conn for listen side of TCP, and do not
119 * add it to the c_hash_list.
121 * If the client reboots, this conn will need to be cleaned up.
122 * rds_tcp_state_change() will do that cleanup
124 rs_tcp = (struct rds_tcp_connection *)conn->c_transport_data;
125 WARN_ON(!rs_tcp || rs_tcp->t_sock);
128 * see the comment above rds_queue_delayed_reconnect()
130 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
131 if (rds_conn_state(conn) == RDS_CONN_UP)
132 rds_tcp_stats_inc(s_tcp_listen_closed_stale);
134 rds_tcp_stats_inc(s_tcp_connect_raced);
140 rds_tcp_set_callbacks(new_sock, conn);
141 rds_connect_complete(conn);
147 sock_release(new_sock);
151 static void rds_tcp_accept_worker(struct work_struct *work)
153 while (rds_tcp_accept_one(rds_tcp_listen_sock) == 0)
157 void rds_tcp_listen_data_ready(struct sock *sk)
159 void (*ready)(struct sock *sk);
161 rdsdebug("listen data ready sk %p\n", sk);
163 read_lock(&sk->sk_callback_lock);
164 ready = sk->sk_user_data;
165 if (!ready) { /* check for teardown race */
166 ready = sk->sk_data_ready;
171 * ->sk_data_ready is also called for a newly established child socket
172 * before it has been accepted and the accepter has set up their
173 * data_ready.. we only want to queue listen work for our listening
176 if (sk->sk_state == TCP_LISTEN)
177 queue_work(rds_wq, &rds_tcp_listen_work);
180 read_unlock(&sk->sk_callback_lock);
184 int rds_tcp_listen_init(void)
186 struct sockaddr_in sin;
187 struct socket *sock = NULL;
190 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
194 sock->sk->sk_reuse = SK_CAN_REUSE;
195 rds_tcp_nonagle(sock);
197 write_lock_bh(&sock->sk->sk_callback_lock);
198 sock->sk->sk_user_data = sock->sk->sk_data_ready;
199 sock->sk->sk_data_ready = rds_tcp_listen_data_ready;
200 write_unlock_bh(&sock->sk->sk_callback_lock);
202 sin.sin_family = PF_INET;
203 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
204 sin.sin_port = (__force u16)htons(RDS_TCP_PORT);
206 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
210 ret = sock->ops->listen(sock, 64);
214 rds_tcp_listen_sock = sock;
222 void rds_tcp_listen_stop(void)
224 struct socket *sock = rds_tcp_listen_sock;
232 /* serialize with and prevent further callbacks */
234 write_lock_bh(&sk->sk_callback_lock);
235 if (sk->sk_user_data) {
236 sk->sk_data_ready = sk->sk_user_data;
237 sk->sk_user_data = NULL;
239 write_unlock_bh(&sk->sk_callback_lock);
242 /* wait for accepts to stop and close the socket */
243 flush_workqueue(rds_wq);
245 rds_tcp_listen_sock = NULL;