Disabling UDP checksums on HME

[Julian Coleman <jdc%coris.org.uk@localhost>]

Hi,

Looking at:

  http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6587521

and related bugs, sun ethernet cards have a UDP checksum bug where a
checksum of 0x0000 is not converted to 0xffff.

So, it looks like we should disable UDP checksums for hme(4) and also
calculate software checksums when the packet length is less than 64
bytes.

UDP checksums are already disabled on gem(4) and we don't (yet) have
drivers for Sun's ce (Cassini) and nxge (Neptune) cards.

Thanks,

J

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