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Commit 3851f1cd authored by Trond Myklebust's avatar Trond Myklebust
Browse files

SUNRPC: Limit the reconnect backoff timer to the max RPC message timeout 



...and ensure that we propagate it to new transports on the same
client.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 02910177

include/linux/sunrpc/xprt.h

+2 −1
Original line number Diff line number Diff line
@@ -218,7 +218,8 @@ struct rpc_xprt { 
	struct work_struct	task_cleanup;

	struct timer_list	timer;

	unsigned long		last_used,

				idle_timeout;

				idle_timeout,

				max_reconnect_timeout;



	/*

	 * Send stuff

net/sunrpc/clnt.c

+3 −0
Original line number Diff line number Diff line
@@ -2638,6 +2638,7 @@ int rpc_clnt_add_xprt(struct rpc_clnt *clnt, 
{

	struct rpc_xprt_switch *xps;

	struct rpc_xprt *xprt;

	unsigned long reconnect_timeout;

	unsigned char resvport;

	int ret = 0;
@@ -2649,6 +2650,7 @@ int rpc_clnt_add_xprt(struct rpc_clnt *clnt, 
		return -EAGAIN;

	}

	resvport = xprt->resvport;

	reconnect_timeout = xprt->max_reconnect_timeout;

	rcu_read_unlock();



	xprt = xprt_create_transport(xprtargs);
@@ -2657,6 +2659,7 @@ int rpc_clnt_add_xprt(struct rpc_clnt *clnt, 
		goto out_put_switch;

	}

	xprt->resvport = resvport;

	xprt->max_reconnect_timeout = reconnect_timeout;



	rpc_xprt_switch_set_roundrobin(xps);

	if (setup) {

net/sunrpc/xprtsock.c

+12 −6
Original line number Diff line number Diff line
@@ -177,7 +177,6 @@ static struct ctl_table sunrpc_table[] = { 
 * increase over time if the server is down or not responding.

 */

#define XS_TCP_INIT_REEST_TO	(3U * HZ)

#define XS_TCP_MAX_REEST_TO	(5U * 60 * HZ)



/*

 * TCP idle timeout; client drops the transport socket if it is idle
@@ -2396,6 +2395,15 @@ static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt) 
	return 0;

}



static void xs_reconnect_backoff(struct rpc_xprt *xprt)

{

	xprt->reestablish_timeout <<= 1;

	if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)

		xprt->reestablish_timeout = xprt->max_reconnect_timeout;

	if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)

		xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;

}



/**

 * xs_connect - connect a socket to a remote endpoint

 * @xprt: pointer to transport structure
@@ -2426,12 +2434,8 @@ static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 
		xs_reset_transport(transport);



		delay = xs_reconnect_delay(xprt);

		xs_reconnect_backoff(xprt);



		xprt->reestablish_timeout <<= 1;

		if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)

			xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;

		if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)

			xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;

	} else

		dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
@@ -2989,6 +2993,8 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 
	xprt->ops = &xs_tcp_ops;

	xprt->timeout = &xs_tcp_default_timeout;



	xprt->max_reconnect_timeout = xprt->timeout->to_maxval;



	INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);

	INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);