net: dsa: add port_fdb_prepare
Push the prepare phase for FDB operations down to the DSA drivers, with a new port_fdb_prepare function. Currently only mv88e6xxx is affected. Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com> Reviewed-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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