Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4a94445c authored May 10, 2010 by Eric Dumazet Committed by David S. Miller May 17, 2010

net: Use ip_route_input_noref() in input path



Use ip_route_input_noref() in ip fast path, to avoid two atomic ops per
incoming packet.

Note: loopback is excluded from this optimization in ip_rcv_finish()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 407eadd9

net/ipv4/arp.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -854,7 +854,7 @@ static int arp_process(struct sk_buff *skb)
		}

		if (arp->ar_op == htons(ARPOP_REQUEST) &&
		ip_route_input(skb, tip, sip, 0, dev) == 0) {
		ip_route_input_noref(skb, tip, sip, 0, dev) == 0) {

		rt = skb_rtable(skb);
		addr_type = rt->rt_type;

net/ipv4/ip_input.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -331,8 +331,8 @@ static int ip_rcv_finish(struct sk_buff *skb)
		* how the packet travels inside Linux networking.
		*/
		if (skb_dst(skb) == NULL) {
		int err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
		skb->dev);
		int err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
		iph->tos, skb->dev);
		if (unlikely(err)) {
		if (err == -EHOSTUNREACH)
		IP_INC_STATS_BH(dev_net(skb->dev),

net/ipv4/xfrm4_input.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -27,8 +27,8 @@ static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb)
		if (skb_dst(skb) == NULL) {
		const struct iphdr *iph = ip_hdr(skb);

		if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
		skb->dev))
		if (ip_route_input_noref(skb, iph->daddr, iph->saddr,
		iph->tos, skb->dev))
		goto drop;
		}
		return dst_input(skb);