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| author | Eric Dumazet <edumazet@google.com> | 2013-04-13 03:22:08 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-13 16:54:14 -0400 |
| commit | bece1b9708434b6fb90b029affc228fc21688404 (patch) | |
| tree | 59b741f84bc6185e9fffcc03194e696cb687aa4b /net/ipv4/tcp.c | |
| parent | eb1d064058c7c7c2b2e414c4c8e81c21965cdbe9 (diff) | |
| download | linux-bece1b9708434b6fb90b029affc228fc21688404.tar.gz linux-bece1b9708434b6fb90b029affc228fc21688404.tar.bz2 linux-bece1b9708434b6fb90b029affc228fc21688404.zip | |
tcp: tcp_tso_segment() small optimization
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>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 963bda18486f..dcb116dde216 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2886,6 +2886,7 @@ 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; @@ -2936,11 +2937,13 @@ 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), |