Commit dadebc00 authored by Jon Paul Maloy's avatar Jon Paul Maloy Committed by David S. Miller
Browse files

tipc: eliminate port_connect()/port_disconnect() functions 



tipc_port_connect()/tipc_port_disconnect() are remnants of the obsolete
native API. Their only task is to grab port_lock and call the functions
__tipc_port_connect()/__tipc_port_disconnect() respectively, which will
perform the actual state change.

Since socket/port exection now is single-threaded the use of port_lock
is not needed any more, so we can safely replace the two functions with
their lock-free counterparts.

In this commit, we remove the two functions. Furthermore, the contents
of __tipc_port_disconnect() is so trivial that we choose to eliminate
that function too, expanding its functionality into tipc_shutdown().
__tipc_port_connect() is simplified, moved to socket.c, and given the
more correct name tipc_sk_finish_conn(). Finally, we eliminate the
function auto_connect(), and expand its contents into filter_connect().

Signed-off-by: default avatarJon Maloy <jon.maloy@ericsson.com>
Reviewed-by: default avatarErik Hugne <erik.hugne@ericsson.com>
Reviewed-by: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 80e44c22

net/tipc/port.c

+0 −84
Original line number Original line Diff line number Diff line
@@ -40,9 +40,6 @@ 
#include "name_table.h"

#include "name_table.h"

#include "socket.h"

#include "socket.h"





/* Connection management: */

#define PROBING_INTERVAL 3600000	/* [ms] => 1 h */



#define MAX_REJECT_SIZE 1024

#define MAX_REJECT_SIZE 1024





DEFINE_SPINLOCK(tipc_port_list_lock);

DEFINE_SPINLOCK(tipc_port_list_lock);
@@ -304,84 +301,3 @@ int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope, 
		p_ptr->published = 0;

		p_ptr->published = 0;

	return res;

	return res;

}
 
}
 


int tipc_port_connect(u32 ref, struct tipc_portid const *peer)

{

	struct tipc_port *p_ptr;

	int res;



	p_ptr = tipc_port_lock(ref);

	if (!p_ptr)

		return -EINVAL;

	res = __tipc_port_connect(ref, p_ptr, peer);

	tipc_port_unlock(p_ptr);

	return res;

}



/*

 * __tipc_port_connect - connect to a remote peer

 *

 * Port must be locked.

 */

int __tipc_port_connect(u32 ref, struct tipc_port *p_ptr,

			struct tipc_portid const *peer)

{

	struct tipc_msg *msg;

	int res = -EINVAL;



	if (p_ptr->published || p_ptr->connected)

		goto exit;

	if (!peer->ref)

		goto exit;



	msg = &p_ptr->phdr;

	msg_set_destnode(msg, peer->node);

	msg_set_destport(msg, peer->ref);

	msg_set_type(msg, TIPC_CONN_MSG);

	msg_set_lookup_scope(msg, 0);

	msg_set_hdr_sz(msg, SHORT_H_SIZE);



	p_ptr->probing_interval = PROBING_INTERVAL;

	p_ptr->probing_state = TIPC_CONN_OK;

	p_ptr->connected = 1;

	k_start_timer(&p_ptr->timer, p_ptr->probing_interval);

	res = tipc_node_add_conn(tipc_port_peernode(p_ptr), p_ptr->ref,

				 tipc_port_peerport(p_ptr));

exit:

	p_ptr->max_pkt = tipc_node_get_mtu(peer->node, ref);

	return res;

}



/*

 * __tipc_disconnect - disconnect port from peer

 *

 * Port must be locked.

 */

int __tipc_port_disconnect(struct tipc_port *tp_ptr)

{

	if (tp_ptr->connected) {

		tp_ptr->connected = 0;

		/* let timer expire on it's own to avoid deadlock! */

		tipc_node_remove_conn(tipc_port_peernode(tp_ptr), tp_ptr->ref);

		return 0;

	}



	return -ENOTCONN;

}



/*

 * tipc_port_disconnect(): Disconnect port form peer.

 *                    This is a node local operation.

 */

int tipc_port_disconnect(u32 ref)

{

	struct tipc_port *p_ptr;

	int res;



	p_ptr = tipc_port_lock(ref);

	if (!p_ptr)

		return -EINVAL;

	res = __tipc_port_disconnect(p_ptr);

	tipc_port_unlock(p_ptr);

	return res;

}

net/tipc/port.h

+0 −10
Original line number Original line Diff line number Diff line
@@ -102,16 +102,6 @@ int tipc_publish(struct tipc_port *p_ptr, unsigned int scope, 
int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,

int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,

		  struct tipc_name_seq const *name_seq);

		  struct tipc_name_seq const *name_seq);





int tipc_port_connect(u32 portref, struct tipc_portid const *port);



int tipc_port_disconnect(u32 portref);



/*

 * The following routines require that the port be locked on entry

 */

int __tipc_port_disconnect(struct tipc_port *tp_ptr);

int __tipc_port_connect(u32 ref, struct tipc_port *p_ptr,

		   struct tipc_portid const *peer);

int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);

int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);





struct sk_buff *tipc_port_get_ports(void);

struct sk_buff *tipc_port_get_ports(void);

net/tipc/socket.c

+37 −38
Original line number Original line Diff line number Diff line
@@ -45,6 +45,7 @@ 
#define SS_READY	-2	/* socket is connectionless */

#define SS_READY	-2	/* socket is connectionless */





#define CONN_TIMEOUT_DEFAULT	8000	/* default connect timeout = 8s */

#define CONN_TIMEOUT_DEFAULT	8000	/* default connect timeout = 8s */

#define CONN_PROBING_INTERVAL 3600000	/* [ms] => 1 h */

#define TIPC_FWD_MSG	        1

#define TIPC_FWD_MSG	        1





static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);

static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
@@ -339,7 +340,9 @@ static int tipc_release(struct socket *sock) 
			if ((sock->state == SS_CONNECTING) ||

			if ((sock->state == SS_CONNECTING) ||

			    (sock->state == SS_CONNECTED)) {

			    (sock->state == SS_CONNECTED)) {

				sock->state = SS_DISCONNECTING;

				sock->state = SS_DISCONNECTING;

				tipc_port_disconnect(port->ref);

				port->connected = 0;

				tipc_node_remove_conn(tipc_port_peernode(port),

						      port->ref);

			}

			}

			if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))

			if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))

				tipc_link_xmit(buf, dnode, 0);

				tipc_link_xmit(buf, dnode, 0);
@@ -988,29 +991,25 @@ static int tipc_send_packet(struct kiocb *iocb, struct socket *sock, 
	return tipc_send_stream(iocb, sock, m, dsz);

	return tipc_send_stream(iocb, sock, m, dsz);

}

}





/**

/* tipc_sk_finish_conn - complete the setup of a connection

 * auto_connect - complete connection setup to a remote port

 * @tsk: tipc socket structure

 * @msg: peer's response message

 *

 * Returns 0 on success, errno otherwise

 */

 */

static int auto_connect(struct tipc_sock *tsk, struct tipc_msg *msg)

static void tipc_sk_finish_conn(struct tipc_port *port, u32 peer_port,

				u32 peer_node)

{

{

	struct tipc_port *port = &tsk->port;

	struct tipc_msg *msg = &port->phdr;

	struct socket *sock = tsk->sk.sk_socket;

	struct tipc_portid peer;



	peer.ref = msg_origport(msg);

	peer.node = msg_orignode(msg);





	__tipc_port_connect(port->ref, port, &peer);

	msg_set_destnode(msg, peer_node);

	msg_set_destport(msg, peer_port);

	msg_set_type(msg, TIPC_CONN_MSG);

	msg_set_lookup_scope(msg, 0);

	msg_set_hdr_sz(msg, SHORT_H_SIZE);





	if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)

	port->probing_interval = CONN_PROBING_INTERVAL;

		return -EINVAL;

	port->probing_state = TIPC_CONN_OK;

	msg_set_importance(&port->phdr, (u32)msg_importance(msg));

	port->connected = 1;

	sock->state = SS_CONNECTED;

	k_start_timer(&port->timer, port->probing_interval);

	return 0;

	tipc_node_add_conn(peer_node, port->ref, peer_port);

	port->max_pkt = tipc_node_get_mtu(peer_node, port->ref);

}

}





/**

/**
@@ -1405,7 +1404,6 @@ static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) 
	struct tipc_msg *msg = buf_msg(*buf);

	struct tipc_msg *msg = buf_msg(*buf);





	int retval = -TIPC_ERR_NO_PORT;

	int retval = -TIPC_ERR_NO_PORT;

	int res;





	if (msg_mcast(msg))

	if (msg_mcast(msg))

		return retval;

		return retval;
@@ -1416,13 +1414,20 @@ static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) 
		if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) {

		if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) {

			if (unlikely(msg_errcode(msg))) {

			if (unlikely(msg_errcode(msg))) {

				sock->state = SS_DISCONNECTING;

				sock->state = SS_DISCONNECTING;

				__tipc_port_disconnect(port);

				port->connected = 0;

				/* let timer expire on it's own */

				tipc_node_remove_conn(tipc_port_peernode(port),

						      port->ref);

			}

			}

			retval = TIPC_OK;

			retval = TIPC_OK;

		}

		}

		break;

		break;

	case SS_CONNECTING:

	case SS_CONNECTING:

		/* Accept only ACK or NACK message */

		/* Accept only ACK or NACK message */



		if (unlikely(!msg_connected(msg)))

			break;



		if (unlikely(msg_errcode(msg))) {

		if (unlikely(msg_errcode(msg))) {

			sock->state = SS_DISCONNECTING;

			sock->state = SS_DISCONNECTING;

			sk->sk_err = ECONNREFUSED;

			sk->sk_err = ECONNREFUSED;
@@ -1430,17 +1435,17 @@ static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) 
			break;

			break;

		}

		}





		if (unlikely(!msg_connected(msg)))

		if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {

			break;



		res = auto_connect(tsk, msg);

		if (res) {

			sock->state = SS_DISCONNECTING;

			sock->state = SS_DISCONNECTING;

			sk->sk_err = -res;

			sk->sk_err = EINVAL;

			retval = TIPC_OK;

			retval = TIPC_OK;

			break;

			break;

		}

		}





		tipc_sk_finish_conn(port, msg_origport(msg), msg_orignode(msg));

		msg_set_importance(&port->phdr, msg_importance(msg));

		sock->state = SS_CONNECTED;



		/* If an incoming message is an 'ACK-', it should be

		/* If an incoming message is an 'ACK-', it should be

		 * discarded here because it doesn't contain useful

		 * discarded here because it doesn't contain useful

		 * data. In addition, we should try to wake up

		 * data. In addition, we should try to wake up
@@ -1816,8 +1821,6 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) 
	struct sk_buff *buf;

	struct sk_buff *buf;

	struct tipc_port *new_port;

	struct tipc_port *new_port;

	struct tipc_msg *msg;

	struct tipc_msg *msg;

	struct tipc_portid peer;

	u32 new_ref;

	long timeo;

	long timeo;

	int res;

	int res;
@@ -1840,7 +1843,6 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) 




	new_sk = new_sock->sk;

	new_sk = new_sock->sk;

	new_port = &tipc_sk(new_sk)->port;

	new_port = &tipc_sk(new_sk)->port;

	new_ref = new_port->ref;

	msg = buf_msg(buf);

	msg = buf_msg(buf);





	/* we lock on new_sk; but lockdep sees the lock on sk */

	/* we lock on new_sk; but lockdep sees the lock on sk */
@@ -1853,9 +1855,7 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) 
	reject_rx_queue(new_sk);

	reject_rx_queue(new_sk);





	/* Connect new socket to it's peer */

	/* Connect new socket to it's peer */

	peer.ref = msg_origport(msg);

	tipc_sk_finish_conn(new_port, msg_origport(msg), msg_orignode(msg));

	peer.node = msg_orignode(msg);

	tipc_port_connect(new_ref, &peer);

	new_sock->state = SS_CONNECTED;

	new_sock->state = SS_CONNECTED;





	tipc_port_set_importance(new_port, msg_importance(msg));

	tipc_port_set_importance(new_port, msg_importance(msg));
@@ -1919,9 +1919,9 @@ restart: 
				kfree_skb(buf);

				kfree_skb(buf);

				goto restart;

				goto restart;

			}

			}

			tipc_port_disconnect(port->ref);

			if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN))

			if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN))

				tipc_link_xmit(buf, dnode, port->ref);

				tipc_link_xmit(buf, dnode, port->ref);

			tipc_node_remove_conn(dnode, port->ref);

		} else {

		} else {

			dnode = tipc_port_peernode(port);

			dnode = tipc_port_peernode(port);

			buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,

			buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
@@ -1930,11 +1930,10 @@ restart: 
					      tipc_port_peerport(port),

					      tipc_port_peerport(port),

					      port->ref, TIPC_CONN_SHUTDOWN);

					      port->ref, TIPC_CONN_SHUTDOWN);

			tipc_link_xmit(buf, dnode, port->ref);

			tipc_link_xmit(buf, dnode, port->ref);

			__tipc_port_disconnect(port);

		}

		}



		port->connected = 0;

		sock->state = SS_DISCONNECTING;

		sock->state = SS_DISCONNECTING;



		tipc_node_remove_conn(dnode, port->ref);

		/* fall through */

		/* fall through */





	case SS_DISCONNECTING:

	case SS_DISCONNECTING:

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