IXGBE_RXDCTL
reg_val = IXGBE_READ_REG(hw, IXGBE_RXDCTL(i));
IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(i), reg_val);
reg_val = IXGBE_READ_REG(hw, IXGBE_RXDCTL(hw_index));
IXGBE_READ_REG(hw, IXGBE_RXDCTL(hw_index)),
reg_val = IXGBE_READ_REG(hw, IXGBE_RXDCTL(rx_ring->hw_index));
IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(rx_ring->hw_index), reg_val);