aboutsummaryrefslogtreecommitdiffstats
path: root/include
diff options
context:
space:
mode:
authorHerbert Xu <herbert@gondor.apana.org.au>2009-05-26 18:50:28 +0000
committerDavid S. Miller <davem@davemloft.net>2009-05-27 03:26:01 -0700
commita5b1cf288d4200506ab62fbb86cc81ace948a306 (patch)
treec95339866f4d67220d111811a92e5c6b79de6ab4 /include
parent7489594cb249aeb178287c9a43a9e4f366044259 (diff)
downloadmrst-s0i3-test-a5b1cf288d4200506ab62fbb86cc81ace948a306.tar.gz
mrst-s0i3-test-a5b1cf288d4200506ab62fbb86cc81ace948a306.tar.xz
mrst-s0i3-test-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')
-rw-r--r--include/linux/netdevice.h23
1 files changed, 14 insertions, 9 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 2e44a049be0..371ece521e5 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)