PORT_MAP
port_mask = (mt7530_read(priv, MT7530_ATRD) >> PORT_MAP)
port_mask = (mt7530_read(priv, MT7530_ATRD) >> PORT_MAP)
fdb->port_mask = (reg[2] >> PORT_MAP) & PORT_MAP_MASK;
reg[2] |= (port_mask & PORT_MAP_MASK) << PORT_MAP;