SUNRPC: Set the TCP user timeout option on client sockets

Use the TCP_USER_TIMEOUT socket option to advertise to the server
how long we will keep the connection open if there is unacknowledged
data. See RFC5482.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index ee0715d..ee359fc 100644 (file)
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2117,6 +2117,7 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
                unsigned int keepidle = xprt->timeout->to_initval / HZ;
                unsigned int keepcnt = xprt->timeout->to_retries + 1;
                unsigned int opt_on = 1;
+               unsigned int timeo;
 
                /* TCP Keepalive options */
                kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
@@ -2128,6 +2129,12 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
                kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
                                (char *)&keepcnt, sizeof(keepcnt));
 
+               /* TCP user timeout (see RFC5482) */
+               timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
+                       (xprt->timeout->to_retries + 1);
+               kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
+                               (char *)&timeo, sizeof(timeo));
+
                write_lock_bh(&sk->sk_callback_lock);
 
                xs_save_old_callbacks(transport, sk);