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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-05-26 18:50:23 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-27 03:25:57 -0700 |
| commit | 78d3fd0b7de844a6dad56e9620fc9d2271b32ab9 (patch) | |
| tree | e79c910646deccc50f5a108782f66cebffafa4d8 /include/linux | |
| parent | 67147ba99aeb48f2863e03b68e090088a34c1b5d (diff) | |
| download | op-kernel-dev-78d3fd0b7de844a6dad56e9620fc9d2271b32ab9.zip op-kernel-dev-78d3fd0b7de844a6dad56e9620fc9d2271b32ab9.tar.gz | |
gro: Only use skb_gro_header for completely non-linear packets
Currently skb_gro_header is used for packets which put the hardware
header in skb->data with the rest in frags. Since the drivers that
need this optimisation all provide completely non-linear packets,
we can gain extra optimisations by only performing the frag0
optimisation for completely non-linear packets.
In particular, we can simply test frag0 (instead of skb_headlen)
to see whether the optimisation is in force.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/netdevice.h | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 61890ed..d1afc3b 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1135,22 +1135,23 @@ static inline void *skb_gro_header(struct sk_buff *skb, unsigned int hlen) hlen += offset; if (!NAPI_GRO_CB(skb)->frag0 || - unlikely(skb_shinfo(skb)->frags[0].size + skb_headlen(skb) < hlen)) + unlikely(skb_shinfo(skb)->frags[0].size < hlen)) { + NAPI_GRO_CB(skb)->frag0 = NULL; return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL; + } return NAPI_GRO_CB(skb)->frag0 + offset; } static inline void *skb_gro_mac_header(struct sk_buff *skb) { - return skb_headlen(skb) ? skb_mac_header(skb) : - NAPI_GRO_CB(skb)->frag0; + return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb); } static inline void *skb_gro_network_header(struct sk_buff *skb) { - return skb_headlen(skb) ? skb_network_header(skb) : - NAPI_GRO_CB(skb)->frag0 + skb_network_offset(skb); + return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + + skb_network_offset(skb); } static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, |
