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net: flow_dissector: small optimizations in IPv4 dissect
authorEric Dumazet <edumazet@google.com>
Thu, 7 Nov 2013 16:37:28 +0000 (08:37 -0800)
committerDavid S. Miller <davem@davemloft.net>
Fri, 8 Nov 2013 18:30:02 +0000 (13:30 -0500)
By moving code around, we avoid :

1) A reload of iph->ihl (bit field, so needs a mask)

2) A conditional test (replaced by a conditional mov on x86)
   Fast path loads iph->protocol anyway.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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