libnvme(2)

✨ NAME ✨

okay so bestie, welcome to the libnvme(2) API manual 💖 and today's main character is literally this struct:

struct nvme_reachability_group_desc — the Reachability Group Descriptor 🦋

that's it. that's the whole vibe. it's a descriptor. for reachability groups. slay.

---

🌈 SYNOPSIS 🌈

struct nvme_reachability_group_desc {
    __le32 rgid;
    __le32 nnid;
    __le64 chngc;
    __u8 rsvd16[16];
    __le32 nsid[];
};

no cap, that's the whole struct. look at her. she's iconic 💅

---

🎀 Members 🎀

• rgid — the Reachability Group ID. it's the group's whole identity fr fr, like her name tag at the function ✨ (type: __le32, little-endian, don't come for me)
• nnid — Number of NSID Values. yes bestie, it counts how many NSIDs are in the list. it's giving "I keep track of the guest list" 👑
• chngc — Change Count. the way this field just... counts changes 😭 it's __le64 so it's got room to grow, periodt
• rsvd16 — Reserved. it's __u8 rsvd16[16], sixteen whole bytes of "mind your business" 🙈 do not touch, do not look at her, she is reserved for a reason
• nsid — Namespace Identifier List. a flexible array member (__le32 nsid[]) full of NSIDs, living her best life at the end of the struct where flexible arrays go 🌸

ngl bestie, rsvd16 is reserved — meaning leave it alone. zero it, ignore it, don't invent meaning for it. the spec said reserved and the spec meant it 💀

---

and that's the whole struct, mwah 🫶 go forth and parse responsibly, and remember: little-endian fields are still little-endian even when you're being iconic ⭐

this has been the libnvme(2) API Manual, struct nvme_reachability_group_desc edition, dated July 2026, from libnvme(2) 💜 tysm for reading, ily, bye bestie 🎀✨