Hello.
On 2/11/2016 1:12 PM, Paolo Abeni wrote:
In case of UDP traffic with datagram length below MTU this
give about 4% performance increase
Gives.
Signed-off-by: Paolo Abeni <pab...@redhat.com>
Suggested-and-acked-by: Hannes Frederic Sowa <han...@stressinduktion.org>
---
net/ipv4/ip_gre.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 7c51c4e..be6f3f6 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -524,6 +524,7 @@ static void gre_fb_xmit(struct sk_buff *skb, struct
net_device *dev)
int tunnel_hlen;
__be16 df, flags;
int err;
+ bool use_cache;
DaveM prefers the declarations "sorted" from longest to shortest.
tun_info = skb_tunnel_info(skb);
if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
@@ -531,9 +532,19 @@ 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;
+
+ use_cache = !skb->mark && tun_info->dst_cache;
+ rt = use_cache ? dst_cache_get_ip4(tun_info->dst_cache, &fl.saddr) :
+ NULL;
+
Empty line hardly needed here.
+ if (!rt) {
+ rt = gre_get_rt(skb, dev, &fl, key);
+ if (IS_ERR(rt))
+ goto err_free_skb;
+ if (use_cache)
+ dst_cache_set_ip4(tun_info->dst_cache, &rt->dst,
+ fl.saddr);
+ }
tunnel_hlen = ip_gre_calc_hlen(key->tun_flags);
MBR, Sergei
