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>
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@ -540,9 +540,16 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
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goto err_free_skb;
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key = &tun_info->key;
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rt = gre_get_rt(skb, dev, &fl, key);
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if (IS_ERR(rt))
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goto err_free_skb;
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rt = !skb->mark ? dst_cache_get_ip4(&tun_info->dst_cache, &fl.saddr) :
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NULL;
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if (!rt) {
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rt = gre_get_rt(skb, dev, &fl, key);
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if (IS_ERR(rt))
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goto err_free_skb;
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if (!skb->mark)
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dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
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fl.saddr);
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}
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tunnel_hlen = ip_gre_calc_hlen(key->tun_flags);
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