libnvme(9)

🌸 libnvme — the struct nvme_set_features_args page 💖

okay bestie, so this is a page out of the libnvme API manual (that's the libnvme(9) section, for the record 👑). It's not a command you type, it's a struct — like, the lil bundle of vibes you hand to the NVMe Admin Set Feature command so it knows what you actually want. Let's get into it 🫶

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✨ NAME ✨

struct nvme_set_features_args — the arguments for the NVMe Admin Set Feature command 💅

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🦋 SYNOPSIS 🦋

struct nvme_set_features_args {
    __u32 *result;
    void *data;
    int args_size;
    int fd;
    __u32 timeout;
    __u32 nsid;
    __u32 cdw11;
    __u32 cdw12;
    __u32 cdw13;
    __u32 cdw15;
    __u32 data_len;
    bool save;
    __u8 uuidx;
    __u8 fid;
 };

no cap, that's the whole shape of it — copy it exactly, don't get cute with the field names 😤

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💫 Members 💫

okay so here's the ✨cast of characters✨ in this struct, one by one, no skipping, we respect every single field in this house 🎀

• result — the command completion result, straight from CQE dword0 ⭐ that's where the answer comes back to you.
• data — the user address of the feature data, if applicable 🦋 like, only if this feature actually has data to point at.
• args_size — the size of struct nvme_set_features_args 📏 yes bestie, the struct knows its own size, iconic behaviour.
• fd — the file descriptor of the nvme device 🔥 that's your lil handle to the actual drive.
• timeout — the timeout, in ms ⏳ measured in milliseconds, so be precise.
• nsid — the namespace ID, if applicable 💜 only relevant when a namespace is actually in the picture.
• cdw11 — the value to set the feature to 👑 this is the main character of the whole operation, fr fr.
• cdw12 — the feature specific command dword12 field 🌈 what goes here depends on the feature, so iykyk.
• cdw13 — the feature specific command dword13 field 🌸 again, feature specific, so check your feature's docs.
• cdw15 — the feature specific command dword15 field 🍓 yes, dword15 — there's no dword14 in the list, don't come for me, that's literally just what the struct says 😭
• data_len — the length of the feature data, if applicable, in bytes 📐 bytes!! not vibes!!
• save — save the value across power states 🔌 so it survives a power cycle, slay.
• uuidx — the UUID Index, for differentiating vendor specific encoding 🧚 that's the lil disambiguator when vendors do their own thing.
• fid — the feature identifier 💅 which feature you're setting, periodt.

heads up bestie: a bunch of these say "if applicable" and "feature specific" for a reason — what you actually fill in depends on which feature you're setting. the struct doesn't guess for you 🙈

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and that's the whole page, no crumbs left 💖 stay hydrated, close your file descriptors, and may your CQE dword0 always say what you hoped 🫶

this was the libnvme API manual, libnvme(9) section — page for struct nvme_set_features_args, dated August 2026 ✨ bye bestie, go set some features 🌟