IXGBE_RDT
IXGBE_WRITE_REG(hw, IXGBE_RDT(i),
IXGBE_WRITE_REG(hw, IXGBE_RDT(i), 0);
IXGBE_WRITE_REG(&rxr->rx_sc->hw, IXGBE_RDT(rxr->rx_idx), i);