Commit 4f8943f8 authored by Trond Myklebust's avatar Trond Myklebust
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SUNRPC: Replace direct task wakeups from softirq context 



Replace the direct task wakeups from inside a softirq context with
wakeups from a process context.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 7e0a0e38

include/linux/sunrpc/xprtsock.h

+5 −0
Original line number Diff line number Diff line
@@ -56,6 +56,7 @@ struct sock_xprt { 
	 */

	unsigned long		sock_state;

	struct delayed_work	connect_worker;

	struct work_struct	error_worker;

	struct work_struct	recv_worker;

	struct mutex		recv_mutex;

	struct sockaddr_storage	srcaddr;
@@ -84,6 +85,10 @@ struct sock_xprt { 
#define XPRT_SOCK_CONNECTING	1U

#define XPRT_SOCK_DATA_READY	(2)

#define XPRT_SOCK_UPD_TIMEOUT	(3)

#define XPRT_SOCK_WAKE_ERROR	(4)

#define XPRT_SOCK_WAKE_WRITE	(5)

#define XPRT_SOCK_WAKE_PENDING	(6)

#define XPRT_SOCK_WAKE_DISCONNECT	(7)



#endif /* __KERNEL__ */

net/sunrpc/xprtsock.c

+72 −6
Original line number Diff line number Diff line
@@ -1211,6 +1211,15 @@ static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);



	clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);

	clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);

	clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);

	clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);

}



static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)

{

	set_bit(nr, &transport->sock_state);

	queue_work(xprtiod_workqueue, &transport->error_worker);

}



static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
@@ -1231,6 +1240,7 @@ static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 
 */

static void xs_error_report(struct sock *sk)

{

	struct sock_xprt *transport;

	struct rpc_xprt *xprt;

	int err;
@@ -1238,13 +1248,14 @@ static void xs_error_report(struct sock *sk) 
	if (!(xprt = xprt_from_sock(sk)))

		goto out;



	transport = container_of(xprt, struct sock_xprt, xprt);

	err = -sk->sk_err;

	if (err == 0)

		goto out;

	dprintk("RPC:       xs_error_report client %p, error=%d...\n",

			xprt, -err);

	trace_rpc_socket_error(xprt, sk->sk_socket, err);

	xprt_wake_pending_tasks(xprt, err);

	xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);

 out:

	read_unlock_bh(&sk->sk_callback_lock);

}
@@ -1507,7 +1518,7 @@ static void xs_tcp_state_change(struct sock *sk) 
			xprt->stat.connect_count++;

			xprt->stat.connect_time += (long)jiffies -

						   xprt->stat.connect_start;

			xprt_wake_pending_tasks(xprt, -EAGAIN);

			xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);

		}

		spin_unlock(&xprt->transport_lock);

		break;
@@ -1525,7 +1536,7 @@ static void xs_tcp_state_change(struct sock *sk) 
		/* The server initiated a shutdown of the socket */

		xprt->connect_cookie++;

		clear_bit(XPRT_CONNECTED, &xprt->state);

		xs_tcp_force_close(xprt);

		xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);

		/* fall through */

	case TCP_CLOSING:

		/*
@@ -1547,7 +1558,7 @@ static void xs_tcp_state_change(struct sock *sk) 
			xprt_clear_connecting(xprt);

		clear_bit(XPRT_CLOSING, &xprt->state);

		/* Trigger the socket release */

		xs_tcp_force_close(xprt);

		xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);

	}

 out:

	read_unlock_bh(&sk->sk_callback_lock);
@@ -1556,6 +1567,7 @@ static void xs_tcp_state_change(struct sock *sk) 
static void xs_write_space(struct sock *sk)

{

	struct socket_wq *wq;

	struct sock_xprt *transport;

	struct rpc_xprt *xprt;



	if (!sk->sk_socket)
@@ -1564,12 +1576,13 @@ static void xs_write_space(struct sock *sk) 


	if (unlikely(!(xprt = xprt_from_sock(sk))))

		return;

	transport = container_of(xprt, struct sock_xprt, xprt);

	rcu_read_lock();

	wq = rcu_dereference(sk->sk_wq);

	if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)

		goto out;



	if (xprt_write_space(xprt))

	xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);

	sk->sk_write_pending--;

out:

	rcu_read_unlock();
@@ -2461,6 +2474,56 @@ static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 
			delay);

}



static void xs_wake_disconnect(struct sock_xprt *transport)

{

	if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))

		xs_tcp_force_close(&transport->xprt);

}



static void xs_wake_write(struct sock_xprt *transport)

{

	if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))

		xprt_write_space(&transport->xprt);

}



static void xs_wake_error(struct sock_xprt *transport)

{

	int sockerr;

	int sockerr_len = sizeof(sockerr);



	if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))

		return;

	mutex_lock(&transport->recv_mutex);

	if (transport->sock == NULL)

		goto out;

	if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))

		goto out;

	if (kernel_getsockopt(transport->sock, SOL_SOCKET, SO_ERROR,

				(char *)&sockerr, &sockerr_len) != 0)

		goto out;

	if (sockerr < 0)

		xprt_wake_pending_tasks(&transport->xprt, sockerr);

out:

	mutex_unlock(&transport->recv_mutex);

}



static void xs_wake_pending(struct sock_xprt *transport)

{

	if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))

		xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);

}



static void xs_error_handle(struct work_struct *work)

{

	struct sock_xprt *transport = container_of(work,

			struct sock_xprt, error_worker);



	xs_wake_disconnect(transport);

	xs_wake_write(transport);

	xs_wake_error(transport);

	xs_wake_pending(transport);

}



/**

 * xs_local_print_stats - display AF_LOCAL socket-specifc stats

 * @xprt: rpc_xprt struct containing statistics
@@ -2873,6 +2936,7 @@ static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 
	xprt->timeout = &xs_local_default_timeout;



	INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);

	INIT_WORK(&transport->error_worker, xs_error_handle);

	INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);



	switch (sun->sun_family) {
@@ -2943,6 +3007,7 @@ static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 
	xprt->timeout = &xs_udp_default_timeout;



	INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);

	INIT_WORK(&transport->error_worker, xs_error_handle);

	INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);



	switch (addr->sa_family) {
@@ -3024,6 +3089,7 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 
		(xprt->timeout->to_retries + 1);



	INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);

	INIT_WORK(&transport->error_worker, xs_error_handle);

	INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);



	switch (addr->sa_family) {

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