The flag to enable the outgoing port mask is in CPU header bit 43, with bit 0 being the leftmost bit of the header. This corresponds to BIT(4) in the third 16-bit value of the header. Correctly set AS_DPM by fixing the off-by-one error. Fixes:9eab76c84e("realtek: Improve TX CPU-Tag usage") Tested-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Signed-off-by: Sander Vanheule <sander@svanheule.net> (cherry picked from commitd9516cacb0)