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net: Improve simple_tx_hash().
authorDavid S. Miller <davem@davemloft.net>
Mon, 21 Jul 2008 16:48:06 +0000 (09:48 -0700)
committerDavid S. Miller <davem@davemloft.net>
Mon, 21 Jul 2008 17:10:48 +0000 (10:10 -0700)
commitb6b2fed1f4802b8fcc9d7548a8f785225d38f9a3
treeeebdc34112d617524b762c585b79b2eaab3386aetree | snapshot (tar.bz2 tar.gz zip)
parentc3ee84163e5bc0dc2e1ccf1d3fc412debca73babcommit | diff
net: Improve simple_tx_hash().

Based upon feedback from Eric Dumazet and Andi Kleen.

Cure several deficiencies in simple_tx_hash() by using
jhash + reciprocol multiply.

1) Eliminates expensive modulus operation.

2) Makes hash less attackable by using random seed.

3) Eliminates endianness hash distribution issues.

Signed-off-by: David S. Miller <davem@davemloft.net>
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