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ila: Don't use dest cache when gateway is set 

If the gateway is set on an ILA route we don't need to bother with using
the destination cache in the ILA route. Translation does not change the
routing in this case so we can stick with orig_output in the lwstate
output function.

Tested: Ran netperf with and without gateway for LWT route.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2016-10-16 21:25:35 -07:00 committed by David S. Miller
parent ab530f63e7
commit ab3a70bef8
1 changed files with 8 additions and 0 deletions
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8
net/ipv6/ila/ila_lwt.c
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@ -36,6 +36,7 @@ static inline struct ila_params *ila_params_lwtunnel(
static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct dst_entry *orig_dst = skb_dst(skb);
struct rt6_info *rt = (struct rt6_info *)orig_dst;
struct ila_lwt *ilwt = ila_lwt_lwtunnel(orig_dst->lwtstate);
struct dst_entry *dst;
int err = -EINVAL;
@ -46,6 +47,13 @@ static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
ila_update_ipv6_locator(skb, ila_params_lwtunnel(orig_dst->lwtstate),
true);
if (rt->rt6i_flags & (RTF_GATEWAY | RTF_CACHE)) {
/* Already have a next hop address in route, no need for
* dest cache route.
*/
return orig_dst->lwtstate->orig_output(net, sk, skb);
}
dst = dst_cache_get(&ilwt->dst_cache);
if (unlikely(!dst)) {
struct ipv6hdr *ip6h = ipv6_hdr(skb);