ipv6: sr: use dst_cache in seg6_input (af4a2209) · Commits · 戴 / test

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>

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);
		}

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