To be honest, I don't think any of it's necessary in the kernel.
The initial device ordering isn't non-deterministic, so it should suffice to
simply work out which eth%d you have to pass to the kernel on the command
line to get it to work nicely on your network. Perhaps you may have to
recalculate that each time you change your BIOS/kernel, but it's not going
to change very often.
Heuristics for changing the device names from userspace later are a
different issue, and MAC addresses, although not universally unique, are a
sensible option for allowing a sysadmin to number their interfaces.
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