vxlan: Optimize vxlan rcv
vxlan-udp-recv function lookup vxlan_sock struct on every packet
recv by using udp-port number. we can use sk->sk_user_data to
store vxlan_sock and avoid lookup.
I have open coded rcu-api to store and read vxlan_sock from
sk_user_data to avoid sparse warning as sk_user_data is not
__rcu pointer.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index ebda3a1..bd35d2d 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -916,6 +916,8 @@
spin_lock(&vn->sock_lock);
hlist_del_rcu(&vs->hlist);
+ smp_wmb();
+ vs->sock->sk->sk_user_data = NULL;
spin_unlock(&vn->sock_lock);
queue_work(vxlan_wq, &vs->del_work);
@@ -1009,7 +1011,8 @@
port = inet_sk(sk)->inet_sport;
- vs = vxlan_find_sock(sock_net(sk), port);
+ smp_read_barrier_depends();
+ vs = (struct vxlan_sock *)sk->sk_user_data;
if (!vs)
goto drop;
@@ -2236,6 +2239,8 @@
atomic_set(&vs->refcnt, 1);
vs->rcv = rcv;
vs->data = data;
+ smp_wmb();
+ vs->sock->sk->sk_user_data = vs;
spin_lock(&vn->sock_lock);
hlist_add_head_rcu(&vs->hlist, vs_head(net, port));