From 4a94445c9a5cf5461fb41d80040033b9a8e2a85a Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 10 May 2010 11:33:06 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/ipv4/arp.c | 2 +- net/ipv4/ip_input.c | 4 ++-- net/ipv4/xfrm4_input.c | 4 ++-- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index 80769f1f9fab..f094b75810db 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -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; diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index af76de5f76de..d930dc5e4d85 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -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), diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c index abcd7ed65db1..ad8fbb871aa0 100644 --- a/net/ipv4/xfrm4_input.c +++ b/net/ipv4/xfrm4_input.c @@ -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); -- 2.20.1