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tcp: tcp_tso_segment() small optimization

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We can move th->check computation out of the loop, as compiler
doesn't know each skb initially share same tcp headers after
skb_segment()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Change-Id: I7f81480604c4bd58f5cdd0be289233b9e6142a7f
This commit is contained in:
Eric Dumazet 2013-04-13 03:22:08 +00:00 committed by surblazer
parent 2687196048
commit 1315c0d65e
1 changed files with 5 additions and 2 deletions
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7
net/ipv4/tcp.c
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@ -2760,6 +2760,7 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
unsigned int oldlen;
unsigned int mss;
struct sk_buff *gso_skb = skb;
__sum16 newcheck;
if (!pskb_may_pull(skb, sizeof(*th)))
goto out;
@ -2808,11 +2809,13 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
th = tcp_hdr(skb);
seq = ntohl(th->seq);
newcheck = ~csum_fold((__force __wsum)((__force u32)th->check +
(__force u32)delta));
do {
th->fin = th->psh = 0;
th->check = newcheck;
th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
(__force u32)delta));
if (skb->ip_summed != CHECKSUM_PARTIAL)
th->check =
csum_fold(csum_partial(skb_transport_header(skb),