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authorEric Dumazet <eric.dumazet@gmail.com>2012-04-12 03:05:28 +0400
committerDavid S. Miller <davem@davemloft.net>2012-04-13 21:39:37 +0400
commit447167bf565a474ff0cfb0f41d54936937479e97 (patch)
tree38b03cb4e23bec19939545575e36f7395c5b156e /net/l2tp
parent77577bf93275b485cecb4f358a085949c32e9dcd (diff)
downloadlinux-447167bf565a474ff0cfb0f41d54936937479e97.tar.xz
udp: intoduce udp_encap_needed static_key
Most machines dont use UDP encapsulation (L2TP) Adds a static_key so that udp_queue_rcv_skb() doesnt have to perform a test if L2TP never setup the encap_rcv on a socket. Idea of this patch came after Simon Horman proposal to add a hook on TCP as well. If static_key is not yet enabled, the fast path does a single JMP . When static_key is enabled, JMP destination is patched to reach the real encap_type/encap_rcv logic, possibly adding cache misses. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Simon Horman <horms@verge.net.au> Cc: dev@openvswitch.org Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp')
-rw-r--r--net/l2tp/l2tp_core.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 89ff8c67943e..f6732b6c758b 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -1424,6 +1424,7 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
/* Mark socket as an encapsulation socket. See net/ipv4/udp.c */
udp_sk(sk)->encap_type = UDP_ENCAP_L2TPINUDP;
udp_sk(sk)->encap_rcv = l2tp_udp_encap_recv;
+ udp_encap_enable();
}
sk->sk_user_data = tunnel;