enum nvme_data_tfr - Data transfer direction of the command

       NVME_DATA_TFR_NO_DATA_TFR
                   No data transfer

       NVME_DATA_TFR_HOST_TO_CTRL
                   Host to controller

       NVME_DATA_TFR_CTRL_TO_HOST
                   Controller to host

       NVME_DATA_TFR_BIDIRECTIONAL
                   Bidirectional

August 2025                                    enum nvme_data_tfr                                     libnvme(2)

       enum nvme_data_tfr - Data transfer direction of the command

       enum nvme_data_tfr {
           NVME_DATA_TFR_NO_DATA_TFR ,
           NVME_DATA_TFR_HOST_TO_CTRL ,
           NVME_DATA_TFR_CTRL_TO_HOST ,
           NVME_DATA_TFR_BIDIRECTIONAL

       };