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ipv6: sr: use dst_cache in seg6_input 

We already use dst_cache in seg6_output, when handling locally generated
packets. We extend it in seg6_input, to also handle forwarded packets, and avoid
unnecessary fib lookups.

Performances for SRH encapsulation before the patch:
Result: OK: 5656067(c5655678+d388) usec, 5000000 (1000byte,0frags)
  884006pps 7072Mb/sec (7072048000bps) errors: 0

Performances after the patch:
Result: OK: 4774543(c4774084+d459) usec, 5000000 (1000byte,0frags)
  1047220pps 8377Mb/sec (8377760000bps) errors: 0

Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Lebrun 2017-03-24 10:46:27 +01:00 committed by David S. Miller
parent 19d5a26f5e
commit af4a2209b1
1 changed files with 26 additions and 1 deletions
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27
net/ipv6/seg6_iptunnel.c
View File

@ -237,6 +237,9 @@ static int seg6_do_srh(struct sk_buff *skb)
static int seg6_input(struct sk_buff *skb)
{
struct dst_entry *orig_dst = skb_dst(skb);
struct dst_entry *dst = NULL;
struct seg6_lwt *slwt;
int err;
err = seg6_do_srh(skb);
@ -245,8 +248,30 @@ static int seg6_input(struct sk_buff *skb)
return err;
}
slwt = seg6_lwt_lwtunnel(orig_dst->lwtstate);
#ifdef CONFIG_DST_CACHE
preempt_disable();
dst = dst_cache_get(&slwt->cache);
preempt_enable();
#endif
skb_dst_drop(skb);
ip6_route_input(skb);
if (!dst) {
ip6_route_input(skb);
#ifdef CONFIG_DST_CACHE
dst = skb_dst(skb);
if (!dst->error) {
preempt_disable();
dst_cache_set_ip6(&slwt->cache, dst,
&ipv6_hdr(skb)->saddr);
preempt_enable();
}
#endif
} else {
skb_dst_set(skb, dst);
}
return dst_input(skb);
}