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authorHerbert Xu <herbert@gondor.apana.org.au>2009-05-26 18:50:21 +0000
committerDavid S. Miller <davem@davemloft.net>2009-05-27 03:25:55 -0700
commit78a478d0efd9e86e5345b436e130497b4e5846e8 (patch)
tree273e7565811add8216267f5893335bdb7928a6b7 /net
parent42da6994ca6d20ad1d4e30255dee98047db454e7 (diff)
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gro: Inline skb_gro_header and cache frag0 virtual address
The function skb_gro_header is called four times per packet which quickly adds up at 10Gb/s. This patch inlines it to allow better optimisations. Some architectures perform multiplication for page_address, which is done by each skb_gro_header invocation. This patch caches that value in skb->cb to avoid the unnecessary multiplications. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev.c27
1 files changed, 12 insertions, 15 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 5eb3e48ab31..bdb1a738193 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2390,21 +2390,6 @@ void napi_gro_flush(struct napi_struct *napi)
}
EXPORT_SYMBOL(napi_gro_flush);
-void *skb_gro_header(struct sk_buff *skb, unsigned int hlen)
-{
- unsigned int offset = skb_gro_offset(skb);
-
- hlen += offset;
- if (unlikely(skb_headlen(skb) ||
- skb_shinfo(skb)->frags[0].size < hlen ||
- PageHighMem(skb_shinfo(skb)->frags[0].page)))
- return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
-
- return page_address(skb_shinfo(skb)->frags[0].page) +
- skb_shinfo(skb)->frags[0].page_offset + offset;
-}
-EXPORT_SYMBOL(skb_gro_header);
-
int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
struct sk_buff **pp = NULL;
@@ -2520,6 +2505,18 @@ int napi_skb_finish(int ret, struct sk_buff *skb)
}
EXPORT_SYMBOL(napi_skb_finish);
+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))
+ NAPI_GRO_CB(skb)->frag0 =
+ page_address(skb_shinfo(skb)->frags[0].page) +
+ skb_shinfo(skb)->frags[0].page_offset;
+}
+EXPORT_SYMBOL(skb_gro_reset_offset);
+
int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
skb_gro_reset_offset(skb);