net: dsa: mv88e6xxx: Add ATU occupancy via devlink resources
The ATU can report how many entries it contains. It does this per bin, there being 4 bins in total. Export the ATU as a devlink resource, and provide a method the needed callback to get the resource occupancy. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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