nvme_mi_ctrl_id - Man Page

__u16 nvme_mi_ctrl_id (nvme_mi_ctrl_t ctrl );

ctrl

controller to query

Retrieve the ID of the controller, as defined by hardware, and available in the Identify (Controller List) data. This is the value passed to nvme_mi_init_ctrl, but may have been created internally via nvme_mi_scan_ep.

the (locally-stored) ID of this controller.