libnvme(2)

💖 NAME 💖

okay so bestie, welcome to libnvme(2) — the API manual, yes that API manual 🫶 — and today's main character is enum nvme_id_iocs_iocsc, which is, and I quote, "This field indicates the Identify I/O Command Set Data Structure." iconic. it's giving "bit fields that run the whole storage world" and honestly?? slay.

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✨ SYNOPSIS ✨

here's the whole enum, copy it exactly bestie, no cap:

enum nvme_id_iocs_iocsc {
    NVME_IOCS_IOCSC_NVMCS_SHIFT ,
    NVME_IOCS_IOCSC_NVMCS_MASK ,
    NVME_IOCS_IOCSC_KVCS_SHIFT ,
    NVME_IOCS_IOCSC_KVCS_MASK ,
    NVME_IOCS_IOCSC_ZNSCS_SHIFT ,
    NVME_IOCS_IOCSC_ZNSCS_MASK ,
    NVME_IOCS_IOCSC_SLMCS_SHIFT ,
    NVME_IOCS_IOCSC_SLMCS_MASK ,
    NVME_IOCS_IOCSC_CPNCS_SHIFT ,
    NVME_IOCS_IOCSC_CPNCS_MASK

};

(yeah there's a lil blank line before the closing brace, that's just the vibe, we don't touch it 💅)

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🌸 Constants 🌸

it's giving shift-and-mask duo energy. every command set rolls up as a shift + a mask and you literally cannot have one without the other. the way that pattern repeats five whole times — obsessed. 😭

• NVME_IOCS_IOCSC_NVMCS_SHIFT — the shift amount you use to get the value of NVM Command Set
• NVME_IOCS_IOCSC_NVMCS_MASK — the mask you use to get the value of NVM Command Set
• NVME_IOCS_IOCSC_KVCS_SHIFT — the shift amount you use to get the value of Key Value Command Set
• NVME_IOCS_IOCSC_KVCS_MASK — the mask you use to get the value of Key Value Command Set
• NVME_IOCS_IOCSC_ZNSCS_SHIFT — the shift amount you use to get the value of Zoned Namespace Command Set
• NVME_IOCS_IOCSC_ZNSCS_MASK — the mask you use to get the value of Zoned Namespace Command Set
• NVME_IOCS_IOCSC_SLMCS_SHIFT — the shift amount you use to get the value of Subsystem Local Memory Command Set
• NVME_IOCS_IOCSC_SLMCS_MASK — the mask you use to get the value of Subsystem Local Memory Command Set
• NVME_IOCS_IOCSC_CPNCS_SHIFT — the shift amount you use to get the value of Computational Programs Namespace Command Set
• NVME_IOCS_IOCSC_CPNCS_MASK — the mask you use to get the value of Computational Programs Namespace Command Set

bestie reminder 🎀 — shift first, then mask. don't do it backwards, iykyk. and yes, "Computational Programs Namespace Command Set" is a mouthful, we still say the whole thing, fr fr.

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that's the whole page, no filler, every constant accounted for 💜. this lil masterpiece is from July 2026, it lives under the title enum nvme_id_iocs_iocsc, and it's page libnvme(2) of the API Manual. go forth and bit-twiddle, queen 👑✨