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

struct nvme_mi_mi_req_hdr - MI request message header.

struct nvme_mi_mi_req_hdr {
struct nvme_mi_msg_hdr hdr;
__u8 opcode;
__u8 rsvd0[3];
__le32 cdw0, cdw1;
};

generic MI message header
opcode (OPC) for the specific MI command
reserved bytes
Management Request Doubleword 0 - command specific usage
Management Request Doubleword 1 - command specific usage

Wire format for MI request message headers, defined in section 5 of NVMe-MI.

struct nvme_mi_mi_req_hdr January 2023