From: Herbert Xu Date: Tue, 26 May 2009 18:50:29 +0000 (+0000) Subject: ipv4: Use 32-bit loads for ID and length in GRO X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1075f3f65d0e0f49351b7d4310e9f94483972a51;p=openwrt%2Fstaging%2Fblogic.git ipv4: Use 32-bit loads for ID and length in GRO This patch optimises the IPv4 GRO code by using 32-bit loads (instead of 16-bit ones) on the ID and length checks in the receive function. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 644cc5535319..5abee4c97449 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1248,9 +1248,9 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head, struct iphdr *iph; unsigned int hlen; unsigned int off; + unsigned int id; int flush = 1; int proto; - int id; off = skb_gro_offset(skb); hlen = off + sizeof(*iph); @@ -1274,9 +1274,9 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head, if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) goto out_unlock; - flush = ntohs(iph->tot_len) != skb_gro_len(skb) || - iph->frag_off != htons(IP_DF); - id = ntohs(iph->id); + id = ntohl(*(u32 *)&iph->id); + flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); + id >>= 16; for (p = *head; p; p = p->next) { struct iphdr *iph2;