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udp: gro behind static key

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Avoid the socket lookup cost in udp_gro_receive if no socket has a
udp tunnel callback configured.

udp_sk(sk)->gro_receive requires a registration with
setup_udp_tunnel_sock, which enables the static key.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn
2018-10-05 11:31:40 -04:00
committed by David S. Miller
parent 2b9156129f
commit f2e9de210d
5 changed files with 6 additions and 4 deletions
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2
net/ipv4/udp.c
View File

@@ -1889,7 +1889,7 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
return 0;
}
static DEFINE_STATIC_KEY_FALSE(udp_encap_needed_key);
DEFINE_STATIC_KEY_FALSE(udp_encap_needed_key);
void udp_encap_enable(void)
{
static_branch_enable(&udp_encap_needed_key);

2
net/ipv4/udp_offload.c
View File

@@ -405,7 +405,7 @@ static struct sk_buff *udp4_gro_receive(struct list_head *head,
{
struct udphdr *uh = udp_gro_udphdr(skb);
if (unlikely(!uh))
if (unlikely(!uh) || !static_branch_unlikely(&udp_encap_needed_key))
goto flush;
/* Don't bother verifying checksum if we're going to flush anyway. */