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>
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index dda2c51..30ef1d1 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -237,6 +237,9 @@
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 @@
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);
}