ipv4: Use 32-bit loads for ID and length in GRO

[net-next-2.6.git] / net / ipv4 / af_inet.c

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 7f03373b8c07b8efd7d3bba01221297dfad5ebaa..5abee4c9744948230bf0fa50277086a2cf1a8316 100644 (file)
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1003,8 +1003,6 @@ void inet_register_protosw(struct inet_protosw *p)
 out:
        spin_unlock_bh(&inetsw_lock);
 
-       synchronize_net();
-
        return;
 
 out_permanent:
@@ -1248,13 +1246,20 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head,
        struct sk_buff **pp = NULL;
        struct sk_buff *p;
        struct iphdr *iph;
+       unsigned int hlen;
+       unsigned int off;
+       unsigned int id;
        int flush = 1;
        int proto;
-       int id;
 
-       iph = skb_gro_header(skb, sizeof(*iph));
-       if (unlikely(!iph))
-               goto out;
+       off = skb_gro_offset(skb);
+       hlen = off + sizeof(*iph);
+       iph = skb_gro_header_fast(skb, off);
+       if (skb_gro_header_hard(skb, hlen)) {
+               iph = skb_gro_header_slow(skb, hlen, off);
+               if (unlikely(!iph))
+                       goto out;
+       }
 
        proto = iph->protocol & (MAX_INET_PROTOS - 1);
 
@@ -1269,9 +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;