From 428539a3a26c44b1facbd296e7c5a0a7e8e53838 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 2 Aug 2014 18:50:50 +0000
Subject: [PATCH] kernel: add a small xfrm related performance optimization

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 41950
---
 .../patches-3.10/616-net_optimize_xfrm_calls.patch  | 13 +++++++++++++
 .../patches-3.14/616-net_optimize_xfrm_calls.patch  | 13 +++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 target/linux/generic/patches-3.10/616-net_optimize_xfrm_calls.patch
 create mode 100644 target/linux/generic/patches-3.14/616-net_optimize_xfrm_calls.patch

diff --git a/target/linux/generic/patches-3.10/616-net_optimize_xfrm_calls.patch b/target/linux/generic/patches-3.10/616-net_optimize_xfrm_calls.patch
new file mode 100644
index 0000000000..a21fec70c6
--- /dev/null
+++ b/target/linux/generic/patches-3.10/616-net_optimize_xfrm_calls.patch
@@ -0,0 +1,13 @@
+--- a/net/netfilter/nf_nat_core.c
++++ b/net/netfilter/nf_nat_core.c
+@@ -89,6 +89,9 @@ int nf_xfrm_me_harder(struct sk_buff *sk
+ 	struct dst_entry *dst;
+ 	int err;
+ 
++	if (!dev_net(skb->dev)->xfrm.policy_count[XFRM_POLICY_OUT])
++		return 0;
++
+ 	err = xfrm_decode_session(skb, &fl, family);
+ 	if (err < 0)
+ 		return err;
+
diff --git a/target/linux/generic/patches-3.14/616-net_optimize_xfrm_calls.patch b/target/linux/generic/patches-3.14/616-net_optimize_xfrm_calls.patch
new file mode 100644
index 0000000000..088d32d407
--- /dev/null
+++ b/target/linux/generic/patches-3.14/616-net_optimize_xfrm_calls.patch
@@ -0,0 +1,13 @@
+--- a/net/netfilter/nf_nat_core.c
++++ b/net/netfilter/nf_nat_core.c
+@@ -90,6 +90,9 @@ int nf_xfrm_me_harder(struct sk_buff *sk
+ 	struct dst_entry *dst;
+ 	int err;
+ 
++	if (!dev_net(skb->dev)->xfrm.policy_count[XFRM_POLICY_OUT])
++		return 0;
++
+ 	err = xfrm_decode_session(skb, &fl, family);
+ 	if (err < 0)
+ 		return err;
+
-- 
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