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tipc: eliminate port_connect()/port_disconnect() functions

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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: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy 2014-08-22 18:09:11 -04:00 committed by David S. Miller
parent 80e44c2225
commit dadebc0029
3 changed files with 37 additions and 132 deletions
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84
net/tipc/port.c
View file

@ -40,9 +40,6 @@
#include "name_table.h"
#include "socket.h"
/* Connection management: */
#define PROBING_INTERVAL 3600000 /* [ms] => 1 h */
#define MAX_REJECT_SIZE 1024
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;
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;
}

10
net/tipc/port.h
View file

@ -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,
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);
struct sk_buff *tipc_port_get_ports(void);

75
net/tipc/socket.c
View file

@ -45,6 +45,7 @@
#define SS_READY -2 /* socket is connectionless */
#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
#define CONN_PROBING_INTERVAL 3600000 /* [ms] => 1 h */
#define TIPC_FWD_MSG 1
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) ||
(sock->state == SS_CONNECTED)) {
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))
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);
}
/**
* auto_connect - complete connection setup to a remote port
* @tsk: tipc socket structure
* @msg: peer's response message
*
* Returns 0 on success, errno otherwise
/* tipc_sk_finish_conn - complete the setup of a connection
*/
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 socket *sock = tsk->sk.sk_socket;
struct tipc_portid peer;
struct tipc_msg *msg = &port->phdr;
peer.ref = msg_origport(msg);
peer.node = msg_orignode(msg);
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);
__tipc_port_connect(port->ref, port, &peer);
if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
return -EINVAL;
msg_set_importance(&port->phdr, (u32)msg_importance(msg));
sock->state = SS_CONNECTED;
return 0;
port->probing_interval = CONN_PROBING_INTERVAL;
port->probing_state = TIPC_CONN_OK;
port->connected = 1;
k_start_timer(&port->timer, port->probing_interval);
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);
int retval = -TIPC_ERR_NO_PORT;
int res;
if (msg_mcast(msg))
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 (unlikely(msg_errcode(msg))) {
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;
}
break;
case SS_CONNECTING:
/* Accept only ACK or NACK message */
if (unlikely(!msg_connected(msg)))
break;
if (unlikely(msg_errcode(msg))) {
sock->state = SS_DISCONNECTING;
sk->sk_err = ECONNREFUSED;
@ -1430,17 +1435,17 @@ static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
break;
}
if (unlikely(!msg_connected(msg)))
break;
res = auto_connect(tsk, msg);
if (res) {
if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
sock->state = SS_DISCONNECTING;
sk->sk_err = -res;
sk->sk_err = EINVAL;
retval = TIPC_OK;
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
* discarded here because it doesn't contain useful
* 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 tipc_port *new_port;
struct tipc_msg *msg;
struct tipc_portid peer;
u32 new_ref;
long timeo;
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_port = &tipc_sk(new_sk)->port;
new_ref = new_port->ref;
msg = buf_msg(buf);
/* 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);
/* Connect new socket to it's peer */
peer.ref = msg_origport(msg);
peer.node = msg_orignode(msg);
tipc_port_connect(new_ref, &peer);
tipc_sk_finish_conn(new_port, msg_origport(msg), msg_orignode(msg));
new_sock->state = SS_CONNECTED;
tipc_port_set_importance(new_port, msg_importance(msg));
@ -1919,9 +1919,9 @@ static int tipc_shutdown(struct socket *sock, int how)
kfree_skb(buf);
goto restart;
}
tipc_port_disconnect(port->ref);
if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN))
tipc_link_xmit(buf, dnode, port->ref);
tipc_node_remove_conn(dnode, port->ref);
} else {
dnode = tipc_port_peernode(port);
buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
@ -1930,11 +1930,10 @@ static int tipc_shutdown(struct socket *sock, int how)
tipc_port_peerport(port),
port->ref, TIPC_CONN_SHUTDOWN);
tipc_link_xmit(buf, dnode, port->ref);
__tipc_port_disconnect(port);
}
port->connected = 0;
sock->state = SS_DISCONNECTING;
tipc_node_remove_conn(dnode, port->ref);
/* fall through */
case SS_DISCONNECTING: