---
name: "nvme_mi_admin_req_hdr"
section: "2"
platform: "linux"
package: "libnvme-dev"
version: "1.13-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/nvme_mi_admin_req_hdr"
---

# nvme\_mi\_admin\_req\_hdr(2)

Admin command request header.

## NAME

struct nvme\_mi\_admin\_req\_hdr - Admin command request header.

## SYNOPSIS

struct nvme\_mi\_admin\_req\_hdr {\
     **struct nvme\_mi\_msg\_hdr hdr;**\
     **\_\_u8 opcode;**\
     **\_\_u8 flags;**\
     **\_\_le16 ctrl\_id;**\
     **\_\_le32 cdw1, cdw2, cdw3, cdw4, cdw5;**\
     **\_\_le32 doff;**\
     **\_\_le32 dlen;**\
     **\_\_le32 rsvd0, rsvd1;**\
     **\_\_le32 cdw10, cdw11, cdw12, cdw13, cdw14, cdw15;**\
 };\

## Members

- hdr

  Generic MI message header

- opcode

  Admin command opcode (using enum nvme\_admin\_opcode)

- flags

  Command Flags, indicating dlen and doff validity; Only defined in NVMe-MI version 1.1, no fields defined in 1.2 (where the dlen/doff are always considered valid).

- ctrl\_id

  Controller ID target of command

- cdw1

  Submission Queue Entry doubleword 1

- cdw2

  Submission Queue Entry doubleword 2

- cdw3

  Submission Queue Entry doubleword 3

- cdw4

  Submission Queue Entry doubleword 4

- cdw5

  Submission Queue Entry doubleword 5

- doff

  Offset of data to return from command

- dlen

  Length of sent/returned data

- rsvd0

  Reserved

- rsvd1

  Reserved

- cdw10

  Submission Queue Entry doubleword 10

- cdw11

  Submission Queue Entry doubleword 11

- cdw12

  Submission Queue Entry doubleword 12

- cdw13

  Submission Queue Entry doubleword 13

- cdw14

  Submission Queue Entry doubleword 14

- cdw15

  Submission Queue Entry doubleword 15

## Description

Wire format for Admin command message headers, defined in section 6 of NVMe-MI.