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Commit 3c1cb4d2 authored by Paolo Abeni's avatar Paolo Abeni Committed by David S. Miller
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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: default avatarPaolo Abeni <pabeni@redhat.com>
Suggested-and-Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 468dfffc

net/ipv4/ip_gre.c

+10 −3
Original line number Diff line number Diff line
@@ -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 = !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);