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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-05-26 18:50:19 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-27 03:25:54 -0700 |
| commit | 42da6994ca6d20ad1d4e30255dee98047db454e7 (patch) | |
| tree | 0feb7e6d5d18c5534f080636e809e7df9934f2c6 /net | |
| parent | 0fb2787bf2fa5dbe02ffd61ca3ce842c50769573 (diff) | |
| download | linux-42da6994ca6d20ad1d4e30255dee98047db454e7.tar.gz linux-42da6994ca6d20ad1d4e30255dee98047db454e7.tar.bz2 linux-42da6994ca6d20ad1d4e30255dee98047db454e7.zip | |
gro: Open-code frags copy in skb_gro_receive
gcc does a poor job at generating code for the memcpy of the frags
array in skb_gro_receive, which is the primary purpose of that
function when merging frags. In particular, it can't utilise the
alignment information of the source and destination. This patch
open-codes the copy so we process words instead of bytes.
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/skbuff.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index d429c41e0dc4..c88426b51140 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2673,6 +2673,9 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb) if (skb_shinfo(p)->frag_list) goto merge; else if (skb_headlen(skb) <= skb_gro_offset(skb)) { + skb_frag_t *frag; + int i; + if (skb_shinfo(p)->nr_frags + skb_shinfo(skb)->nr_frags > MAX_SKB_FRAGS) return -E2BIG; @@ -2682,9 +2685,9 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb) skb_shinfo(skb)->frags[0].size -= skb_gro_offset(skb) - skb_headlen(skb); - memcpy(skb_shinfo(p)->frags + skb_shinfo(p)->nr_frags, - skb_shinfo(skb)->frags, - skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t)); + frag = skb_shinfo(p)->frags + skb_shinfo(p)->nr_frags; + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) + *frag++ = skb_shinfo(skb)->frags[i]; skb_shinfo(p)->nr_frags += skb_shinfo(skb)->nr_frags; skb_shinfo(skb)->nr_frags = 0; |