libnvme(9)

💖 libnvme(9) — API Manual 💖

okay so bestie, welcome to the libnvme API manual ✨ today's main character is a struct called nvme_mi_vpd_hdr, aka the Vital Product Data Common Header — yes that's its government name, and yes it ate 👑

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🌸 NAME 🌸

struct nvme_mi_vpd_hdr — Vital Product Data Common Header 🎀

like, it's the little header that sits at the front of your VPD and tells you where all the other areas live. no cap, it's giving table-of-contents energy.

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✨ SYNOPSIS ✨

here's the whole vibe, character for character, don't touch it:

struct nvme_mi_vpd_hdr {
    __u8 ipmiver;
    __u8 iuaoff;
    __u8 ciaoff;
    __u8 biaoff;
    __u8 piaoff;
    __u8 mrioff;
    __u8 rsvd6;
    __u8 chchk;
    __u8 vpd[];
 };

look at all those __u8s just lined up like a little choir 🫶 and then vpd[] at the end being all flexible and mysterious, flexible-array-member vibes fr fr.

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🦋 Members 🦋

time for the roll call, everyone say hi 👋

• ipmiver — IPMI Format Version Number. it's literally the version number of the IPMI format 💅
• iuaoff — Internal Use Area Starting Offset. where the Internal Use Area starts, iconically.
• ciaoff — Chassis Info Area Starting Offset. yup, the starting offset of the Chassis Info Area ✨
• biaoff — Board Info Area Starting Offset. the Board Info Area's starting offset, slay.
• piaoff — Product Info Area Starting Offset. Product Info Area starting offset, we been knew.
• mrioff — MultiRecord Info Area Starting Offset. and this one's the MultiRecord Info Area starting offset 👑
• rsvd6 — Reserved. 🔒 not for you, bestie, it's reserved, hands off.
• chchk — Common Header Checksum. the checksum for the common header, keeping things honest 🧚
• vpd — Vital Product Data. the actual data itself, the whole point of the party 🍓

so yeah, a bunch of offsets, a version, a reserved byte doing nothing (respectfully), a checksum, and then the payload. simple, iconic, no notes 💜

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lowkey reminder bestie: every single one of those fields is __u8, and the manual says exactly what each one is — don't go guessing at meanings that aren't written down here, that's not the vibe check we're passing 🙈

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and that's the whole page, bestie!! 🎀💖✨

sign-off time: this lil struct doc is from the libnvme(9) API Manual, dated October 2026, and the footer's whole personality was struct nvme_mi_vpd_hdr with the page name libnvme(9) again — so basically it said its own name twice, which is very main character of it 💅 byeee 🦋