HW_ATL_B0_RXD_SIZE
.rxd_size = HW_ATL_B0_RXD_SIZE, \
HW_ATL_B0_RXD_SIZE];
&ring->dx_ring[ring->sw_tail * HW_ATL_B0_RXD_SIZE];
(ring->dx_ring + (ring->hw_head * HW_ATL_B0_RXD_SIZE));
&ring->dx_ring[ring->hw_head * HW_ATL_B0_RXD_SIZE];