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gro: Avoid unnecessary comparison after skb_gro_header

Browse source 
For the overwhelming majority of cases, skb_gro_header's return
value cannot be NULL.  Yet we must check it because of its current
form.  This patch splits it up into multiple functions in order
to avoid this.

Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Herbert Xu 2009-05-26 18:50:28 +00:00 • committed by David S. Miller
commit a5b1cf288d
5 changed files with 62 additions and 26 deletions
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13
net/ipv4/af_inet.c
View file

@ -1246,13 +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;
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);

22
net/ipv4/tcp.c
View file

@ -2518,20 +2518,30 @@ struct sk_buff **tcp_gro_receive(struct sk_buff **head, struct sk_buff *skb)
unsigned int thlen;
unsigned int flags;
unsigned int mss = 1;
unsigned int hlen;
unsigned int off;
int flush = 1;
int i;
th = skb_gro_header(skb, sizeof(*th));
if (unlikely(!th))
goto out;
off = skb_gro_offset(skb);
hlen = off + sizeof(*th);
th = skb_gro_header_fast(skb, off);
if (skb_gro_header_hard(skb, hlen)) {
th = skb_gro_header_slow(skb, hlen, off);
if (unlikely(!th))
goto out;
}
thlen = th->doff * 4;
if (thlen < sizeof(*th))
goto out;
th = skb_gro_header(skb, thlen);
if (unlikely(!th))
goto out;
hlen = off + thlen;
if (skb_gro_header_hard(skb, hlen)) {
th = skb_gro_header_slow(skb, hlen, off);
if (unlikely(!th))
goto out;
}
skb_gro_pull(skb, thlen);