diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-05-26 18:50:28 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-27 03:26:01 -0700 |
| commit | a5b1cf288d4200506ab62fbb86cc81ace948a306 (patch) | |
| tree | c95339866f4d67220d111811a92e5c6b79de6ab4 /include/linux/netdevice.h | |
| parent | 7489594cb249aeb178287c9a43a9e4f366044259 (diff) | |
| download | lwn-a5b1cf288d4200506ab62fbb86cc81ace948a306.tar.gz lwn-a5b1cf288d4200506ab62fbb86cc81ace948a306.zip | |
gro: Avoid unnecessary comparison after skb_gro_header
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>
Diffstat (limited to 'include/linux/netdevice.h')
| -rw-r--r-- | include/linux/netdevice.h | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 2e44a049be0f..371ece521e58 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1132,18 +1132,23 @@ 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); + return NAPI_GRO_CB(skb)->frag0 + offset; +} - 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; - } +static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen) +{ + return NAPI_GRO_CB(skb)->frag0_len < hlen; +} - return NAPI_GRO_CB(skb)->frag0 + offset; +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) |