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;
--
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