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Commit af4a2209 authored by David Lebrun's avatar David Lebrun Committed by David S. Miller
Browse files

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: default avatarDavid Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 19d5a26f

net/ipv6/seg6_iptunnel.c

+26 −1
Original line number Diff line number Diff line
@@ -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);



	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);

}