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gro: Store shinfo in local variable in skb_gro_receive

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This patch stores the two shinfo pointers in local variables
because they're used over and over again in skb_gro_receive.

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 2009-05-26 18:50:33 +00:00 committed by David S. Miller
parent 66e92fcf1d
commit 9aaa156cf9
1 changed files with 12 additions and 10 deletions
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22
net/core/skbuff.c
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@ -2664,6 +2664,8 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
{
struct sk_buff *p = *head;
struct sk_buff *nskb;
struct skb_shared_info *skbinfo = skb_shinfo(skb);
struct skb_shared_info *pinfo = skb_shinfo(p);
unsigned int headroom;
unsigned int len = skb_gro_len(skb);
unsigned int offset = skb_gro_offset(skb);
@ -2672,24 +2674,24 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
if (p->len + len >= 65536)
return -E2BIG;
if (skb_shinfo(p)->frag_list)
if (pinfo->frag_list)
goto merge;
else if (headlen <= offset) {
skb_frag_t *frag;
skb_frag_t *frag2;
int i = skb_shinfo(skb)->nr_frags;
int nr_frags = skb_shinfo(p)->nr_frags + i;
int i = skbinfo->nr_frags;
int nr_frags = pinfo->nr_frags + i;
offset -= headlen;
if (nr_frags > MAX_SKB_FRAGS)
return -E2BIG;
skb_shinfo(p)->nr_frags = nr_frags;
skb_shinfo(skb)->nr_frags = 0;
pinfo->nr_frags = nr_frags;
skbinfo->nr_frags = 0;
frag = skb_shinfo(p)->frags + nr_frags;
frag2 = skb_shinfo(skb)->frags + i;
frag = pinfo->frags + nr_frags;
frag2 = skbinfo->frags + i;
do {
*--frag = *--frag2;
} while (--i);
@ -2726,7 +2728,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
*NAPI_GRO_CB(nskb) = *NAPI_GRO_CB(p);
skb_shinfo(nskb)->frag_list = p;
skb_shinfo(nskb)->gso_size = skb_shinfo(p)->gso_size;
skb_shinfo(nskb)->gso_size = pinfo->gso_size;
skb_header_release(p);
nskb->prev = p;
@ -2742,8 +2744,8 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
merge:
if (offset > headlen) {
skb_shinfo(skb)->frags[0].page_offset += offset - headlen;
skb_shinfo(skb)->frags[0].size -= offset - headlen;
skbinfo->frags[0].page_offset += offset - headlen;
skbinfo->frags[0].size -= offset - headlen;
offset = headlen;
}