Hamachi hardware checksum support

[Pete Wyckoff]

I used a slightly modified ttcp (you can guess what the params mean):

    su2cn4# ../tcp/nttcp2 -t -n 16384 -l 16384 -w 64 10.2.2.3
    ttcp-t: buflen=16384, nbuf=16384, align=16384/0, port=5001, sockbufsize=65536  tcp  -> 10.2.2.3

No module parameters, so default IntrCtrl values (from the code):

    writel(0x00080000, ioaddr + TxIntrCtrl);
    writel(0x00000020, ioaddr + RxIntrCtrl);

    -- Pete

Ted says:
> What were you using for sender and receiver and command line parameters to
> get the 16% boost?  Thanks.
---------------------------------------------
Pete Wyckoff          | wyckoff@ca.sandia.gov
Sandia National Labs  | 925 294 3503 (voice)
MS 9011, P.O. Box 969 | 925 294 1225 (fax)
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