EEE interferes with the hardware's ability to loop a packet back to the
host.  This patch disables the feature for the duration of the test.
Signed-off-by: NMatt Carlson <mcarlson@broadcom.com>
Reviewed-by: NMichael Chan <mchan@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>