tipc: make media xmit call outside node spinlock context

Currently, message sending is performed through a deep call chain,
where the node spinlock is grabbed and held during a significant
part of the transmission time. This is clearly detrimental to
overall throughput performance; it would be better if we could send
the message after the spinlock has been released.

In this commit, we do instead let the call revert on the stack after
the buffer chain has been added to the transmission queue, whereafter
clones of the buffers are transmitted to the device layer outside the
spinlock scope.

As a further step in our effort to separate the roles of the node
and link entities we also move the function tipc_link_xmit() to
node.c, and rename it to tipc_node_xmit().

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

1 files changed, 11 insertions, 11 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 87fef25f6519..5b0b08d58fcc 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -261,7 +261,7 @@ static void tsk_rej_rx_queue(struct sock *sk)
 
 	while ((skb = __skb_dequeue(&sk->sk_receive_queue))) {
 		if (tipc_msg_reverse(own_node, skb, &dnode, TIPC_ERR_NO_PORT))
-			tipc_link_xmit_skb(sock_net(sk), skb, dnode, 0);
+			tipc_node_xmit_skb(sock_net(sk), skb, dnode, 0);
 	}
 }
 
@@ -443,7 +443,7 @@ static int tipc_release(struct socket *sock)
 			}
 			if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode,
 					     TIPC_ERR_NO_PORT))
-				tipc_link_xmit_skb(net, skb, dnode, 0);
+				tipc_node_xmit_skb(net, skb, dnode, 0);
 		}
 	}
 
@@ -456,7 +456,7 @@ static int tipc_release(struct socket *sock)
 				      tsk_own_node(tsk), tsk_peer_port(tsk),
 				      tsk->portid, TIPC_ERR_NO_PORT);
 		if (skb)
-			tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
+			tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
 		tipc_node_remove_conn(net, dnode, tsk->portid);
 	}
 
@@ -925,7 +925,7 @@ new_mtu:
 	do {
 		skb = skb_peek(pktchain);
 		TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong;
-		rc = tipc_link_xmit(net, pktchain, dnode, tsk->portid);
+		rc = tipc_node_xmit(net, pktchain, dnode, tsk->portid);
 		if (likely(!rc)) {
 			if (sock->state != SS_READY)
 				sock->state = SS_CONNECTING;
@@ -1045,7 +1045,7 @@ next:
 		return rc;
 	do {
 		if (likely(!tsk_conn_cong(tsk))) {
-			rc = tipc_link_xmit(net, pktchain, dnode, portid);
+			rc = tipc_node_xmit(net, pktchain, dnode, portid);
 			if (likely(!rc)) {
 				tsk->sent_unacked++;
 				sent += send;
@@ -1224,7 +1224,7 @@ static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
 		return;
 	msg = buf_msg(skb);
 	msg_set_msgcnt(msg, ack);
-	tipc_link_xmit_skb(net, skb, dnode, msg_link_selector(msg));
+	tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
 }
 
 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
@@ -1703,7 +1703,7 @@ static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
 		return 0;
 	}
 	if (!err || tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode, -err))
-		tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
+		tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
 	return 0;
 }
 
@@ -1799,7 +1799,7 @@ int tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
 		if (!tipc_msg_reverse(tn->own_addr, skb, &dnode, -err))
 			continue;
 xmit:
-		tipc_link_xmit_skb(net, skb, dnode, dport);
+		tipc_node_xmit_skb(net, skb, dnode, dport);
 	}
 	return err ? -EHOSTUNREACH : 0;
 }
@@ -2092,7 +2092,7 @@ restart:
 			}
 			if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode,
 					     TIPC_CONN_SHUTDOWN))
-				tipc_link_xmit_skb(net, skb, dnode,
+				tipc_node_xmit_skb(net, skb, dnode,
 						   tsk->portid);
 		} else {
 			dnode = tsk_peer_node(tsk);
@@ -2102,7 +2102,7 @@ restart:
 					      0, dnode, tsk_own_node(tsk),
 					      tsk_peer_port(tsk),
 					      tsk->portid, TIPC_CONN_SHUTDOWN);
-			tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
+			tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
 		}
 		tsk->connected = 0;
 		sock->state = SS_DISCONNECTING;
@@ -2164,7 +2164,7 @@ static void tipc_sk_timeout(unsigned long data)
 	}
 	bh_unlock_sock(sk);
 	if (skb)
-		tipc_link_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid);
+		tipc_node_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid);
 exit:
 	sock_put(sk);
 }