target/linux/generic/pending-4.9/616-net_optimize_xfrm_calls.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Subject: kernel: add a small xfrm related performance optimization
   3
   4 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   5 ---
   6  net/netfilter/nf_nat_core.c | 3 +++
   7  1 file changed, 3 insertions(+)
   8
   9 diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
  10 index 5b9c884a452e..4ea363755085 100644
  11 --- a/net/netfilter/nf_nat_core.c
  12 +++ b/net/netfilter/nf_nat_core.c
  13 @@ -95,6 +95,9 @@ int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family)
  14         struct dst_entry *dst;
  15         int err;
  16
  17 +       if (skb->dev && !dev_net(skb->dev)->xfrm.policy_count[XFRM_POLICY_OUT])
  18 +               return 0;
  19 +
  20         err = xfrm_decode_session(skb, &fl, family);
  21         if (err < 0)
  22                 return err;
  23 --
  24 2.11.0
  25