libnvme(9)

💖 libnvme(9) — struct nvme_id_ctrl_nvm 💖

okay bestie, welcome to the API Manual for libnvme, and specifically for this absolute icon: the I/O Command Set Specific Identify Controller data structure. it's called struct nvme_id_ctrl_nvm and honestly? she's giving "controller said what it can do, in NVM command set flavour." let's get into it 🫶

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✨ NAME ✨

struct nvme_id_ctrl_nvm — the I/O Command Set Specific Identify Controller data structure, bestie. that's the whole vibe. 💅

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🌸 SYNOPSIS 🌸

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

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 rla;
    __le16 slmc;
    __u8 rsvd28[4068];
 };

yes there really is a 4068-byte reserved array at the end. she's mostly vibes and padding. 🎀

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🦋 Members 🦋

okay so every field, one by one, no skipping — this is the whole point of the page fr fr:

• vsl — Verify Size Limit. that's the ceiling on verify, periodt.
• wzsl — Write Zeroes Size Limit. how big your write-zeroes can be. 💀
• wusl — Write Uncorrectable Size Limit. same energy, but for write uncorrectable.
• dmrl — Dataset Management Ranges Limit. how many ranges dataset management is willing to deal with.
• dmrsl — Dataset Management Range Size Limit. per-range size cap, iykyk.
• dmsl — Dataset Management Size Limit. the big overall dataset management limit. 👑
• kpiocap — Key Per I/O Capabilities. key per I/O said "here's what I can do." 🔥
• wzdsl — Write Zeroes With Deallocate Size Limit. write zeroes with deallocate, specifically — not the same as wzsl, don't get it twisted. ✨
• aocs — Admin Optional Command Support. which admin optional commands are supported, literally.
• ver — Version. the version field. iconic of her.
• lbamqf — LBA Migration Queue Format. LBA migration queue, but which format? this field.
• rla — Rate Limiting Attributes — check enum nvme_id_ctrl_nvm_rla for the details bestie, that's where the real tea is. 🌸
• slmc — Soft Limit Maximum Controllers, and it's 0's based, and it's valid only if SLS is set. like, only. don't forget the SLS part. 🙈
• rsvd28 — Reserved. nothing to see here, just 4068 bytes of "mind your business." 💅

real talk: slmc is 0's based and conditional on SLS — that's not a vibe check, that's a correctness check. 💖

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🧚 sign-off 🧚

this little page is from October 2026, all about struct nvme_id_ctrl_nvm, and it lives in the libnvme(9) manual. go forth and identify those controllers, bestie — slay. 🌈⭐🍓

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