--- /dev/null
+/*
+ * 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/gfp.h>
+#include <linux/in.h>
+#include <net/tcp.h>
+
+#include "rds.h"
+#include "tcp.h"
+
+/*
+ * cheesy, but simple..
+ */
+static void rds_tcp_accept_worker(struct work_struct *work);
+static DECLARE_WORK(rds_tcp_listen_work, rds_tcp_accept_worker);
+static struct socket *rds_tcp_listen_sock;
+
+static int rds_tcp_keepalive(struct socket *sock)
+{
+ /* values below based on xs_udp_default_timeout */
+ int keepidle = 5; /* send a probe 'keepidle' secs after last data */
+ int keepcnt = 5; /* number of unack'ed probes before declaring dead */
+ int keepalive = 1;
+ int ret = 0;
+
+ ret = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
+ (char *)&keepalive, sizeof(keepalive));
+ if (ret < 0)
+ goto bail;
+
+ ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT,
+ (char *)&keepcnt, sizeof(keepcnt));
+ if (ret < 0)
+ goto bail;
+
+ ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE,
+ (char *)&keepidle, sizeof(keepidle));
+ if (ret < 0)
+ goto bail;
+
+ /* KEEPINTVL is the interval between successive probes. We follow
+ * the model in xs_tcp_finish_connecting() and re-use keepidle.
+ */
+ ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL,
+ (char *)&keepidle, sizeof(keepidle));
+bail:
+ return ret;
+}
+
+static int rds_tcp_accept_one(struct socket *sock)
+{
+ struct socket *new_sock = NULL;
+ struct rds_connection *conn;
+ int ret;
+ struct inet_sock *inet;
+ struct rds_tcp_connection *rs_tcp;
+
+ ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
+ sock->sk->sk_protocol, &new_sock);
+ if (ret)
+ goto out;
+
+ new_sock->type = sock->type;
+ new_sock->ops = sock->ops;
+ ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
+ if (ret < 0)
+ goto out;
+
+ ret = rds_tcp_keepalive(new_sock);
+ if (ret < 0)
+ goto out;
+
+ rds_tcp_tune(new_sock);
+
+ inet = inet_sk(new_sock->sk);
+
+ rdsdebug("accepted tcp %pI4:%u -> %pI4:%u\n",
+ &inet->inet_saddr, ntohs(inet->inet_sport),
+ &inet->inet_daddr, ntohs(inet->inet_dport));
+
+ conn = rds_conn_create(inet->inet_saddr, inet->inet_daddr,
+ &rds_tcp_transport, GFP_KERNEL);
+ if (IS_ERR(conn)) {
+ ret = PTR_ERR(conn);
+ goto out;
+ }
+ /* An incoming SYN request came in, and TCP just accepted it.
+ * We always create a new conn for listen side of TCP, and do not
+ * add it to the c_hash_list.
+ *
+ * If the client reboots, this conn will need to be cleaned up.
+ * rds_tcp_state_change() will do that cleanup
+ */
+ rs_tcp = (struct rds_tcp_connection *)conn->c_transport_data;
+ WARN_ON(!rs_tcp || rs_tcp->t_sock);
+
+ /*
+ * see the comment above rds_queue_delayed_reconnect()
+ */
+ if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
+ if (rds_conn_state(conn) == RDS_CONN_UP)
+ rds_tcp_stats_inc(s_tcp_listen_closed_stale);
+ else
+ rds_tcp_stats_inc(s_tcp_connect_raced);
+ rds_conn_drop(conn);
+ ret = 0;
+ goto out;
+ }
+
+ rds_tcp_set_callbacks(new_sock, conn);
+ rds_connect_complete(conn);
+ new_sock = NULL;
+ ret = 0;
+
+out:
+ if (new_sock)
+ sock_release(new_sock);
+ return ret;
+}
+
+static void rds_tcp_accept_worker(struct work_struct *work)
+{
+ while (rds_tcp_accept_one(rds_tcp_listen_sock) == 0)
+ cond_resched();
+}
+
+void rds_tcp_listen_data_ready(struct sock *sk)
+{
+ void (*ready)(struct sock *sk);
+
+ rdsdebug("listen data ready sk %p\n", sk);
+
+ read_lock(&sk->sk_callback_lock);
+ ready = sk->sk_user_data;
+ if (!ready) { /* check for teardown race */
+ ready = sk->sk_data_ready;
+ goto out;
+ }
+
+ /*
+ * ->sk_data_ready is also called for a newly established child socket
+ * before it has been accepted and the accepter has set up their
+ * data_ready.. we only want to queue listen work for our listening
+ * socket
+ */
+ if (sk->sk_state == TCP_LISTEN)
+ queue_work(rds_wq, &rds_tcp_listen_work);
+
+out:
+ read_unlock(&sk->sk_callback_lock);
+ ready(sk);
+}
+
+int rds_tcp_listen_init(void)
+{
+ struct sockaddr_in sin;
+ struct socket *sock = NULL;
+ int ret;
+
+ ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (ret < 0)
+ goto out;
+
+ sock->sk->sk_reuse = SK_CAN_REUSE;
+ rds_tcp_nonagle(sock);
+
+ write_lock_bh(&sock->sk->sk_callback_lock);
+ sock->sk->sk_user_data = sock->sk->sk_data_ready;
+ sock->sk->sk_data_ready = rds_tcp_listen_data_ready;
+ write_unlock_bh(&sock->sk->sk_callback_lock);
+
+ sin.sin_family = PF_INET;
+ sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
+ sin.sin_port = (__force u16)htons(RDS_TCP_PORT);
+
+ ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
+ if (ret < 0)
+ goto out;
+
+ ret = sock->ops->listen(sock, 64);
+ if (ret < 0)
+ goto out;
+
+ rds_tcp_listen_sock = sock;
+ sock = NULL;
+out:
+ if (sock)
+ sock_release(sock);
+ return ret;
+}
+
+void rds_tcp_listen_stop(void)
+{
+ struct socket *sock = rds_tcp_listen_sock;
+ struct sock *sk;
+
+ if (!sock)
+ return;
+
+ sk = sock->sk;
+
+ /* serialize with and prevent further callbacks */
+ lock_sock(sk);
+ write_lock_bh(&sk->sk_callback_lock);
+ if (sk->sk_user_data) {
+ sk->sk_data_ready = sk->sk_user_data;
+ sk->sk_user_data = NULL;
+ }
+ write_unlock_bh(&sk->sk_callback_lock);
+ release_sock(sk);
+
+ /* wait for accepts to stop and close the socket */
+ flush_workqueue(rds_wq);
+ sock_release(sock);
+ rds_tcp_listen_sock = NULL;
+}
Code Review / kvmfornfv.git / blobdiff