samsung_sm8750/android_kernel_samsung_sm8750
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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 <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2009-05-26 18:50:28 +00:00
committed by David S. Miller
parent 7489594cb2
commit a5b1cf288d
5 changed files with 63 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
include/linux/netdevice.h
View File

@@ -1132,20 +1132,25 @@ static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
NAPI_GRO_CB(skb)->data_offset += len;
}
static inline void *skb_gro_header(struct sk_buff *skb, unsigned int hlen)
static inline void *skb_gro_header_fast(struct sk_buff *skb,
unsigned int offset)
{
unsigned int offset = skb_gro_offset(skb);
hlen += offset;
if (NAPI_GRO_CB(skb)->frag0_len < hlen) {
NAPI_GRO_CB(skb)->frag0 = NULL;
NAPI_GRO_CB(skb)->frag0_len = 0;
return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
}
return NAPI_GRO_CB(skb)->frag0 + offset;
}
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
unsigned int offset)
{
NAPI_GRO_CB(skb)->frag0 = NULL;
NAPI_GRO_CB(skb)->frag0_len = 0;
return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
}
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);