adding if_dev member to struct ifnet

[Brooks Davis]

Since there are some objections to this proposal, I have an alternative
one for consideration.  I would add two new members to ifnet, if_dname
and if_dunit, containing the driver name and unit which would be similar
to the current if_name and if_unit with the exception that if_dunit
would be an int to match unit in device_t.  Negative values of unit
would mean "no unit" for pseudo devices where units don't really make
sense.

Because this would add annoying overhead to the init routine, I would
also propose adding an if_initname() function that would hide the
initialization of these variables and (if MFC'd) aid portability
between 4 and 5.

Is this a better or worse idea then adding if_dev?

-- Brooks

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