2 bytes of the MTU are reserved for Atheros DSA tag, but DSA core has already handled that since commitdc0fe7d47f. Remove the unnecessary reservation. Fixes:d51b6ce441("net: ethernet: add ag71xx driver") Signed-off-by: DENG Qingfang <dqfext@gmail.com> Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20210218034514.3421-1-dqfext@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>