tipc: aggregate port structure into socket structure

After the removal of the tipc native API the relation between
a tipc_port and its API types is strictly one-to-one, i.e, the
latter can now only be a socket API. There is therefore no need
to allocate struct tipc_port and struct sock independently.

In this commit, we aggregate struct tipc_port into struct tipc_sock,
hence saving both CPU cycles and structure complexity.

There are no functional changes in this commit, except for the
elimination of the separate allocation/freeing of tipc_port.
All other changes are just adaptatons to the new data structure.

This commit also opens up for further code simplifications and
code volume reduction, something we will do in later commits.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 40 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 62655772add..912665d409d 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1,7 +1,7 @@
 /*
  * net/tipc/socket.c: TIPC socket API
  *
- * Copyright (c) 2001-2007, 2012 Ericsson AB
+ * Copyright (c) 2001-2007, 2012-2014, Ericsson AB
  * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
  * All rights reserved.
  *
@@ -38,21 +38,12 @@
 #include "port.h"
 
 #include <linux/export.h>
-#include <net/sock.h>
 
 #define SS_LISTENING	-1	/* socket is listening */
 #define SS_READY	-2	/* socket is connectionless */
 
 #define CONN_TIMEOUT_DEFAULT	8000	/* default connect timeout = 8s */
 
-struct tipc_sock {
-	struct sock sk;
-	struct tipc_port *p;
-	unsigned int conn_timeout;
-};
-
-#define tipc_sk(sk) ((struct tipc_sock *)(sk))
-#define tipc_sk_port(sk) (tipc_sk(sk)->p)
 
 static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
@@ -114,6 +105,8 @@ static struct proto tipc_proto_kern;
  *   - port reference
  */
 
+#include "socket.h"
+
 /**
  * advance_rx_queue - discard first buffer in socket receive queue
  *
@@ -205,7 +198,6 @@ static int tipc_sk_create(struct net *net, struct socket *sock, int protocol,
 	sk->sk_rcvbuf = sysctl_tipc_rmem[1];
 	sk->sk_data_ready = tipc_data_ready;
 	sk->sk_write_space = tipc_write_space;
-	tipc_sk(sk)->p = tp_ptr;
 	tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
 
 	spin_unlock_bh(tp_ptr->lock);
@@ -437,18 +429,17 @@ static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
 			int *uaddr_len, int peer)
 {
 	struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
-	struct tipc_sock *tsock = tipc_sk(sock->sk);
+	struct tipc_port *port = tipc_sk_port(sock->sk);
 
 	memset(addr, 0, sizeof(*addr));
 	if (peer) {
 		if ((sock->state != SS_CONNECTED) &&
 			((peer != 2) || (sock->state != SS_DISCONNECTING)))
 			return -ENOTCONN;
-
-		addr->addr.id.ref = tipc_port_peerport(tsock->p);
-		addr->addr.id.node = tipc_port_peernode(tsock->p);
+		addr->addr.id.ref = tipc_port_peerport(port);
+		addr->addr.id.node = tipc_port_peernode(port);
 	} else {
-		addr->addr.id.ref = tsock->p->ref;
+		addr->addr.id.ref = port->ref;
 		addr->addr.id.node = tipc_own_addr;
 	}
 
@@ -879,14 +870,13 @@ exit:
  */
 static int auto_connect(struct socket *sock, struct tipc_msg *msg)
 {
-	struct tipc_sock *tsock = tipc_sk(sock->sk);
-	struct tipc_port *p_ptr;
+	struct tipc_port *p_ptr = tipc_sk_port(sock->sk);
 	struct tipc_portid peer;
 
 	peer.ref = msg_origport(msg);
 	peer.node = msg_orignode(msg);
 
-	p_ptr = tipc_port_deref(tsock->p->ref);
+	p_ptr = tipc_port_deref(p_ptr->ref);
 	if (!p_ptr)
 		return -EINVAL;
 
@@ -1270,17 +1260,18 @@ static void tipc_data_ready(struct sock *sk, int len)
 
 /**
  * filter_connect - Handle all incoming messages for a connection-based socket
- * @tsock: TIPC socket
+ * @port: TIPC port
  * @msg: message
  *
  * Returns TIPC error status code and socket error status code
  * once it encounters some errors
  */
-static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf)
+static u32 filter_connect(struct tipc_port *port, struct sk_buff **buf)
 {
-	struct socket *sock = tsock->sk.sk_socket;
+	struct sock *sk = tipc_port_to_sk(port);
+	struct socket *sock = sk->sk_socket;
 	struct tipc_msg *msg = buf_msg(*buf);
-	struct sock *sk = &tsock->sk;
+
 	u32 retval = TIPC_ERR_NO_PORT;
 	int res;
 
@@ -1290,10 +1281,10 @@ static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf)
 	switch ((int)sock->state) {
 	case SS_CONNECTED:
 		/* Accept only connection-based messages sent by peer */
-		if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) {
+		if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) {
 			if (unlikely(msg_errcode(msg))) {
 				sock->state = SS_DISCONNECTING;
-				__tipc_port_disconnect(tsock->p);
+				__tipc_port_disconnect(port);
 			}
 			retval = TIPC_OK;
 		}
@@ -1401,7 +1392,7 @@ static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
 		if (msg_connected(msg))
 			return TIPC_ERR_NO_PORT;
 	} else {
-		res = filter_connect(tipc_sk(sk), &buf);
+		res = filter_connect(tipc_sk_port(sk), &buf);
 		if (res != TIPC_OK || buf == NULL)
 			return res;
 	}
@@ -1447,9 +1438,9 @@ static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
  *
  * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
  */
-static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
+static u32 dispatch(struct tipc_port *port, struct sk_buff *buf)
 {
-	struct sock *sk = tport->sk;
+	struct sock *sk = tipc_port_to_sk(port);
 	u32 res;
 
 	/*
@@ -1478,10 +1469,9 @@ static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
  *
  * Called with port lock already taken.
  */
-static void wakeupdispatch(struct tipc_port *tport)
+static void wakeupdispatch(struct tipc_port *port)
 {
-	struct sock *sk = tport->sk;
-
+	struct sock *sk = tipc_port_to_sk(port);
 	sk->sk_write_space(sk);
 }
 
@@ -1661,8 +1651,7 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 {
 	struct sock *new_sk, *sk = sock->sk;
 	struct sk_buff *buf;
-	struct tipc_sock *new_tsock;
-	struct tipc_port *new_tport;
+	struct tipc_port *new_port;
 	struct tipc_msg *msg;
 	struct tipc_portid peer;
 	u32 new_ref;
@@ -1675,7 +1664,6 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 		res = -EINVAL;
 		goto exit;
 	}
-
 	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 	res = tipc_wait_for_accept(sock, timeo);
 	if (res)
@@ -1688,9 +1676,8 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 		goto exit;
 
 	new_sk = new_sock->sk;
-	new_tsock = tipc_sk(new_sk);
-	new_tport = new_tsock->p;
-	new_ref = new_tport->ref;
+	new_port = tipc_sk_port(new_sk);
+	new_ref = new_port->ref;
 	msg = buf_msg(buf);
 
 	/* we lock on new_sk; but lockdep sees the lock on sk */
@@ -1710,8 +1697,8 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 
 	tipc_set_portimportance(new_ref, msg_importance(msg));
 	if (msg_named(msg)) {
-		new_tport->conn_type = msg_nametype(msg);
-		new_tport->conn_instance = msg_nameinst(msg);
+		new_port->conn_type = msg_nametype(msg);
+		new_port->conn_instance = msg_nameinst(msg);
 	}
 
 	/*
@@ -1729,7 +1716,6 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 		skb_set_owner_r(buf, new_sk);
 	}
 	release_sock(new_sk);
-
 exit:
 	release_sock(sk);
 	return res;