int nvme_identify_primary_ctrl (int fd , __u16 cntid , struct nvme_primary_ctrl_cap *cap );
File descriptor of nvme device
Return controllers starting at this identifier
User space destination buffer address to transfer the data
See struct nvme_primary_ctrl_cap for the definition of the returned structure, cap.
The nvme command status if a response was received (see enum nvme_status_field) or -1 with errno set otherwise.