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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-04-11 23:05:28 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-13 13:39:37 -0400 |
| commit | 447167bf565a474ff0cfb0f41d54936937479e97 (patch) | |
| tree | 38b03cb4e23bec19939545575e36f7395c5b156e /net/l2tp/l2tp_core.c | |
| parent | 77577bf93275b485cecb4f358a085949c32e9dcd (diff) | |
| download | linux-stable-447167bf565a474ff0cfb0f41d54936937479e97.tar.gz linux-stable-447167bf565a474ff0cfb0f41d54936937479e97.tar.bz2 linux-stable-447167bf565a474ff0cfb0f41d54936937479e97.zip | |
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/l2tp_core.c')
| -rw-r--r-- | net/l2tp/l2tp_core.c | 1 |
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; |