K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2015-01-13T08:32:41.933656Z
K 7
svn:log
V 615
Make miibus(4) fully ifnet(9) agnostic, removing layering violation.

This allows to mii_attach() in drivers prior to if_attach(), but on the
other hand puts some extra work on drivers.

Drivers now should:
- Do mii_attach() before if_attach().
- Do baudrate management theirselves in miibus_statchg devmethod.
- Do link state management theirselves in miibus_linkchg devmethod.

Some PHYs require to obtain MTU of the interface. Instead of doing it
via ifnet(9) layer, provide new miibus method miibus_readvar. Drivers
that expect such PHYs must implement this method and return IF_MTU.

Sponsored by:	Nginx, Inc.

END