PWN-Hunter/android_kernel_xiaomi_sdm845
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gro: Open-code memcpy in napi_fraginfo_skb

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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2009-01-29 14:19:52 +00:00 committed by David S. Miller
parent 81705ad1b2
commit 80595d59ba
1 changed files with 9 additions and 1 deletions
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10
net/core/dev.c
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@ -2533,6 +2533,8 @@ 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;
@ -2545,8 +2547,14 @@ 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;