libnvme(2)

💖 NAME 💖

ok so bestie, quick vibe check: struct nvme_id_ctrl_nvm is the I/O Command Set Specific Identify Controller data structure ✨ — yes that's a whole mouthful, but it's basically the lil info blob that tells you what an NVMe controller can do when you're looking at it through a specific I/O Command Set. Slay.

This is a page from the libnvme(2) API Manual, btw. We're deep in the API manual section, iykyk 🫶

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🌸 SYNOPSIS 🌸

no cap, here's the struct in all its glory — copy it exactly, no edits, periodt:

struct nvme_id_ctrl_nvm {
    __u8 vsl;
    __u8 wzsl;
    __u8 wusl;
    __u8 dmrl;
    __le32 dmrsl;
    __le64 dmsl;
    __u8 kpiocap;
    __u8 wzdsl;
    __le16 aocs;
    __le32 ver;
    __u8 lbamqf;
    __u8 rsvd25[4071];
};

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👑 Members 👑

okay so every single field, one by one, no skips, we are thorough girlies here 💅

• vsl — Verify Size Limit. that's the cap on how big a Verify can be, bestie.
• wzsl — Write Zeroes Size Limit. the limit for Write Zeroes operations.
• wusl — Write Uncorrectable Size Limit. yep, the ceiling for Write Uncorrectable.
• dmrl — Dataset Management Ranges Limit. how many ranges Dataset Management can handle at once.
• dmrsl — Dataset Management Range Size Limit. how big each of those ranges can get.
• dmsl — Dataset Management Size Limit. the overall Dataset Management size limit ✨
• kpiocap — Key Per I/O Capabilities. the Key Per I/O tea ☕
• wzdsl — Write Zeroes With Deallocate Size Limit. size limit but for Write Zeroes with Deallocate, the deluxe version 💅
• aocs — Admin Optional Command Support. which optional admin commands are supported.
• ver — Version. literally just the version, iconic behavior.
• lbamqf — LBA Migration Queue Format. the LBA Migration Queue format field, and yes it's a mouthful.
• rsvd25 — Reserved. it's reserved babes, do not touch 🙈 leave it alone, it's not for us.

fr fr: rsvd25 is Reserved — don't go writing your own little secrets in there, that's not the move.

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and that's the whole page, main character struct energy only ✨

this was struct nvme_id_ctrl_nvm from the libnvme(2) API Manual, dated July 2026 — mwah, go forth and identify some controllers bestie, you're doing amazing sweetie 🎀🦋💜