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rds: tcp: set linger to 1 when unloading a rds-tcp

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If we are unloading the rds_tcp module, we can set linger to 1
and drop pending packets to accelerate reconnect. The peer will
end up resetting the connection based on new generation numbers
of the new incarnation, so hanging on to unsent TCP packets via
linger is mostly pointless in this case.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Tested-by: Jenny Xu <jenny.x.xu@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sowmini Varadhan 2017-06-21 13:40:13 -07:00 committed by David S. Miller
parent 69b92b5b74
commit c14b036681
5 changed files with 7 additions and 2 deletions
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1
net/rds/connection.c
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@ -412,6 +412,7 @@ void rds_conn_destroy(struct rds_connection *conn)
"%pI4\n", conn, &conn->c_laddr,
&conn->c_faddr);
conn->c_destroy_in_prog = 1;
/* Ensure conn will not be scheduled for reconnect */
spin_lock_irq(&rds_conn_lock);
hlist_del_init_rcu(&conn->c_hash_node);

3
net/rds/rds.h
View File

@ -137,7 +137,8 @@ struct rds_connection {
__be32 c_faddr;
unsigned int c_loopback:1,
c_ping_triggered:1,
c_pad_to_32:30;
c_destroy_in_prog:1,
c_pad_to_32:29;
int c_npaths;
struct rds_connection *c_passive;
struct rds_transport *c_trans;

1
net/rds/tcp.h
View File

@ -71,6 +71,7 @@ void rds_tcp_listen_data_ready(struct sock *sk);
int rds_tcp_accept_one(struct socket *sock);
int rds_tcp_keepalive(struct socket *sock);
void *rds_tcp_listen_sock_def_readable(struct net *net);
void rds_tcp_set_linger(struct socket *sock);
/* tcp_recv.c */
int rds_tcp_recv_init(void);

2
net/rds/tcp_connect.c
View File

@ -170,6 +170,8 @@ void rds_tcp_conn_path_shutdown(struct rds_conn_path *cp)
cp->cp_conn, tc, sock);
if (sock) {
if (cp->cp_conn->c_destroy_in_prog)
rds_tcp_set_linger(sock);
sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
lock_sock(sock->sk);
rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */

2
net/rds/tcp_listen.c
View File

@ -112,7 +112,7 @@ struct rds_tcp_connection *rds_tcp_accept_one_path(struct rds_connection *conn)
return NULL;
}
static void rds_tcp_set_linger(struct socket *sock)
void rds_tcp_set_linger(struct socket *sock)
{
struct linger no_linger = {
.l_onoff = 1,