libnvme(9)

💖 libnvme(9) — API Manual 💖

okay bestie, sit down, hydrate, because we're talking about libnvme, the NVMe library, and today's main character is one very specific struct. it's giving low-level C, it's giving kernel-adjacent, and honestly? it ate. 🫶

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✨ NAME ✨

struct nvme_dim_args — the argument bundle for the Discovery Information Management command, aka DIM. that's it, that's the name, no notes. 💅

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🌸 SYNOPSIS 🌸

here's the whole vibe, verbatim, don't touch a single character:

struct nvme_dim_args {
    __u32 *result;
    void *data;
    int args_size;
    int fd;
    __u32 timeout;
    __u32 data_len;
    __u8 tas;
 };

like. look at her. seven members. compact. iconic. no cap. ✨

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🦋 Members 🦋

one by one, bestie, because every single field matters and we do NOT skip fields in this house:

• result — a __u32 * pointer, and when the command finishes it gets set to the command's CQE DWORD 0 controller response. that's your little receipt from the controller, fr fr. 🧾
• data — a void * pointer pointing at the DIM data. just a pointer. pointing at the data. living its truth.
• args_size — an int holding the length of the structure. it's measuring itself. self-aware king. 👑
• fd — an int, the file descriptor of the nvme device. your personal hotline to the drive. 📞
• timeout — a __u32, the timeout in ms. milliseconds, not seconds, don't get cute with it or you'll be waiting on main character energy that never arrives. 😭
• data_len — a __u32, the length of data. yes it's different from args_size. yes both exist. no we do not merge them. 🙈
• tas — a __u8, the Task field of the Command Dword 10 (cdw10). tiny field, one byte, huge responsibility. 🎀

lowkey important: result, data, args_size, fd, timeout, data_len and tas are the whole struct. that's the list. don't go looking for more, there isn't more. 💀

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and that's the page, bestie!! 🌈 this was libnvme(9), from the API Manual, and the version we're bopping to is dated August 2026. go forth, pass your fd, set your timeout, and slay your DIM command. periodt. 💖✨🎀🦋🌸💅🫶