cpm_enet_down and MAC address change.

[Graham Stoney]

Daris A Nevil writes:
> I have been promising myself that I would re-work the ethernet driver ...

If you do, I think it would be good to integrate similar changes to those I
made to the FEC driver, in the patch at:
    http://members.xoom.com/greyhams/linux/patches/2.2/fecdmaskb.patch

In particular, DMA directly into the skbuf avoids a copy, and received
packets that get dropped should only be counted in rx_dropped -- not counted
again in rx_packets.  Also, it's good to avoid reading the buffer descriptor
status bits multiple times, especially since they're uncached.

Regards,
Graham
--
Graham Stoney
Principal Hardware/Software Engineer
Canon Information Systems Research Australia
Ph: +61 2 9805 2909  Fax: +61 2 9805 2929

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