[vortex] two models of 3C905C-TX-M and transfert error with3C905C-TX-M

[Andrew Morton]

I still don't like this comment in 3com's driver:

    //
    // Check the ASIC type. Udp checksum should not be used in
    // pre-Tornado cards-  JRR
    //

But Olivier's problems are with TCP...

If he replaces the line

        skb->ip_summed = CHECKSUM_UNNECESSARY;

with

        skb->ip_summed = CHECKSUM_NONE;

then the problems may go away.  This would be an interesting
exercise, but I suspect the hardware is broke.

It would also be interesting to actually do a bitwise
comparison of the corrupted data, see if there's
a pattern there.