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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 /net/core/dev.c | |
| parent | 67147ba99aeb48f2863e03b68e090088a34c1b5d (diff) | |
| download | lwn-78d3fd0b7de844a6dad56e9620fc9d2271b32ab9.tar.gz lwn-78d3fd0b7de844a6dad56e9620fc9d2271b32ab9.zip | |
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 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index bdb1a738193d..f9d90c56b6f0 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2510,7 +2510,8 @@ void skb_gro_reset_offset(struct sk_buff *skb) NAPI_GRO_CB(skb)->data_offset = 0; NAPI_GRO_CB(skb)->frag0 = NULL; - if (!skb_headlen(skb) && !PageHighMem(skb_shinfo(skb)->frags[0].page)) + if (skb->mac_header == skb->tail && + !PageHighMem(skb_shinfo(skb)->frags[0].page)) NAPI_GRO_CB(skb)->frag0 = page_address(skb_shinfo(skb)->frags[0].page) + skb_shinfo(skb)->frags[0].page_offset; |