net/mlx4_en: Enable DCB ETS ops only when supported by the firmware
Enable the DCB ETS ops only when supported by the firmware. For older firmware/cards which don't support ETS, advertize only PFC DCB ops. Signed-off-by: NEugenia Emantayev <eugenia@mellanox.co.il> Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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