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SUNRPC: Set the TCP_SYNCNT to match the socket timeout 

Set the TCP SYN count so that we abort the connection attempt at around
the expected timeout value.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2023-08-19 17:32:21 -04:00 committed by Anna Schumaker
parent 88975a5596
commit 3a107f0740
1 changed files with 14 additions and 0 deletions
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14
net/sunrpc/xprtsock.c
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@ -2230,9 +2230,13 @@ static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
struct socket *sock)
{
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
struct net *net = sock_net(sock->sk);
unsigned long connect_timeout;
unsigned long syn_retries;
unsigned int keepidle;
unsigned int keepcnt;
unsigned int timeo;
unsigned long t;
spin_lock(&xprt->transport_lock);
keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
@ -2250,6 +2254,16 @@ static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
/* TCP user timeout (see RFC5482) */
tcp_sock_set_user_timeout(sock->sk, timeo);
/* Connect timeout */
connect_timeout = max_t(unsigned long,
DIV_ROUND_UP(xprt->connect_timeout, HZ), 1);
syn_retries = max_t(unsigned long,
READ_ONCE(net->ipv4.sysctl_tcp_syn_retries), 1);
for (t = 0; t <= syn_retries && (1UL << t) < connect_timeout; t++)
;
if (t <= syn_retries)
tcp_sock_set_syncnt(sock->sk, t - 1);
}
static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,