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, 2 insertions, 2 deletions

diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c
index 3a1539e96294..e6018b7eb197 100644
--- a/net/tipc/name_distr.c
+++ b/net/tipc/name_distr.c
@@ -102,7 +102,7 @@ void named_cluster_distribute(struct net *net, struct sk_buff *skb)
                 if (!oskb)
                         break;
                 msg_set_destnode(buf_msg(oskb), dnode);
-                tipc_link_xmit_skb(net, oskb, dnode, dnode);
+                tipc_node_xmit_skb(net, oskb, dnode, dnode);
         }
         rcu_read_unlock();
 
@@ -223,7 +223,7 @@ void tipc_named_node_up(struct net *net, u32 dnode)
                          &tn->nametbl->publ_list[TIPC_ZONE_SCOPE]);
         rcu_read_unlock();
 
-        tipc_link_xmit(net, &head, dnode, dnode);
+        tipc_node_xmit(net, &head, dnode, dnode);
 }
 
 static void tipc_publ_subscribe(struct net *net, struct publication *publ,