libnvme(9) API Manual libnvme(9)

# [NAME](#NAME)

enum nvme\_data\_tfr - Data transfer direction of the command

# [SYNOPSIS](#SYNOPSIS)

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**

};

# [Constants](#Constants)

[NVME\_DATA\_TFR\_NO\_DATA\_TFR](#NVME_DATA_TFR_NO_DATA_TFR)

No data transfer

[NVME\_DATA\_TFR\_HOST\_TO\_CTRL](#NVME_DATA_TFR_HOST_TO_CTRL)

Host to controller

[NVME\_DATA\_TFR\_CTRL\_TO\_HOST](#NVME_DATA_TFR_CTRL_TO_HOST)

Controller to host

[NVME\_DATA\_TFR\_BIDIRECTIONAL](#NVME_DATA_TFR_BIDIRECTIONAL)

Bidirectional

enum nvme\_data\_tfr October 2026

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Document: nvme_data_tfr-libnvme3(2) from nvme-cli 3.2-r0 (Chainguard OS)
Source: https://github.com/linux-nvme/nvme-cli