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authorPaolo Abeni <pabeni@redhat.com>2016-02-12 15:43:59 +0100
committerDavid S. Miller <davem@davemloft.net>2016-02-16 20:21:49 -0500
commit3c1cb4d2604c03779a6c9485204e2a80be6c28f0 (patch)
tree576d9b9b839017a90b336b2908b95dd6f2668e4e /net/ipv4/ip_gre.c
parent468dfffcd762cbb2777ec5a76bc21e3748ebf47e (diff)
downloadlinux-3c1cb4d2604c03779a6c9485204e2a80be6c28f0.tar.bz2
net/ipv4: add dst cache support for gre lwtunnels
In case of UDP traffic with datagram length below MTU this gives about 4% performance increase Signed-off-by: Paolo Abeni <pabeni@redhat.com> Suggested-and-Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_gre.c')
-rw-r--r--net/ipv4/ip_gre.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 65748db44285..917c2c1bfadd 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -540,9 +540,16 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
goto err_free_skb;
key = &tun_info->key;
- rt = gre_get_rt(skb, dev, &fl, key);
- if (IS_ERR(rt))
- goto err_free_skb;
+ rt = !skb->mark ? dst_cache_get_ip4(&tun_info->dst_cache, &fl.saddr) :
+ NULL;
+ if (!rt) {
+ rt = gre_get_rt(skb, dev, &fl, key);
+ if (IS_ERR(rt))
+ goto err_free_skb;
+ if (!skb->mark)
+ dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
+ fl.saddr);
+ }
tunnel_hlen = ip_gre_calc_hlen(key->tun_flags);