---
name: "nvme_mi_msg_hdr-libnvme3"
section: "2"
platform: "linux"
package: "nvme-cli"
version: "3.2-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/nvme_mi_msg_hdr-libnvme3"
---

# nvme\_mi\_msg\_hdr-libnvme3(2)

General MI message header.

## NAME

struct nvme\_mi\_msg\_hdr - General MI message header.

## SYNOPSIS

struct nvme\_mi\_msg\_hdr {\
     **\_\_u8 type;**\
     **\_\_u8 nmp;**\
     **\_\_u8 meb;**\
     **\_\_u8 rsvd0;**\
 };\

## Members

- type

  MCTP message type, will always be NVME\_MI\_MSGTYPE\_NVME

- nmp

  NVMe-MI message parameters (including MI message type)

- meb

  Management Endpoint Buffer flag; unused for libnvme-mi implementation

- rsvd0

  currently reserved

## Description

Wire format shared by both request and response messages, per NVMe-MI section 3.1. This is used for all message types, MI and Admin.