[PATCH 4/4] gro: Open-code memcpy in napi_fraginfo_skb
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: 2009-01-30 00:19:56
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
gro: Open-code memcpy in napi_fraginfo_skb This patch optimises napi_fraginfo_skb to only copy the bits necessary. We also open-code the memcpy so that the alignment information is always available to gcc. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> --- net/core/dev.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 3742397..d55f725 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -2541,6 +2541,8 @@ struct sk_buff *napi_fraginfo_skb(struct napi_struct *napi, struct net_device *dev = napi->dev; struct sk_buff *skb = napi->skb; struct ethhdr *eth; + skb_frag_t *frag; + int i; napi->skb = NULL;
@@ -2553,8 +2555,14 @@ struct sk_buff *napi_fraginfo_skb(struct napi_struct *napi, } BUG_ON(info->nr_frags > MAX_SKB_FRAGS); + frag = &info->frags[info->nr_frags - 1]; + + for (i = skb_shinfo(skb)->nr_frags; i < info->nr_frags; i++) { + skb_fill_page_desc(skb, i, frag->page, frag->page_offset, + frag->size); + frag++; + } skb_shinfo(skb)->nr_frags = info->nr_frags; - memcpy(skb_shinfo(skb)->frags, info->frags, sizeof(info->frags)); skb->data_len = info->len; skb->len += info->len;