DOKK / manpages / debian 12 / libnvme-dev / nvme_data_tfr.2.en
libnvme(2) API Manual 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

};

No data transfer
Host to controller
Controller to host
Bidirectional
enum nvme_data_tfr January 2023