libnvme(2)

💖 libnvme — struct nvme_lm_io_completion_queue_data 💖

okay bestie, sit down, hydrate, and let me tell you about this little struct from the libnvme API manual (that's section 2 of the manual, the one for library calls, iykyk). this one is genuinely niche and I'm obsessed with it.

---

✨ NAME ✨

struct nvme_lm_io_completion_queue_data — I/O Completion Queue data structure. 🌸

she holds the fields related to the contents of the Create I/O Completion Queue command that created an I/O Completion Queue. so basically she's the receipts 🧾 for a completion queue that already exists. not the command itself, just the tea about what it made. periodt.

---

🦋 SYNOPSIS 🦋

struct nvme_lm_io_completion_queue_data {
    __le64 iocqprp1;
    __le16 iocqqsize;
    __le16 iocqqid;
    __le16 iocqhp;
    __le16 iocqtp;
    __le32 iocqa;
    __u8 rsvd20[4];
 };

look at her. so compact. so neat. lowkey a work of art. 💅

---

👑 Members 👑

okay now the main character energy part — every single field, no skips, fr fr:

• iocqprp1 — I/O Completion Queue PRP Entry 1 (that's IOCQPRP1, the fancy acronym, keep it in your notes bestie). 💖
• iocqqsize — I/O Completion Queue Size, aka IOCQQSIZE. how big the queue is, no cap.
• iocqqid — I/O Completion Queue Identifier</... wait, no, gotta close it properly: I/O Completion Queue Identifier (IOCQQID). it's her name tag. 🎀
• iocqhp — I/O Completion Queue Head Pointer (IOCQHP). the head pointer is doing head pointer things. iconic behaviour.
• iocqtp — I/O Completion Queue Tail Pointer (IOCQTP). yes, she's the tail to that head. they're a package deal. 🫶
• iocqa — I/O Completion Queue Attributes (IOCQA). the ~vibes~ field. the personality, if you will.
• rsvd20 — Reserved. 🙈 do not touch. do not write to it. do not look at it too long. reserved means reserved, bestie, that's a boundary and we respect boundaries. 💀

---

💀 a gentle reminder: rsvd20 is Reserved. it is not a secret bonus field for you to store your little gremlin data in. hands off. ✋

---

okay that's the whole struct!! every field accounted for, nothing dropped, we ate and left no crumbs 🍓✨

July 2026 — that's the date on this page, and it lives in the libnvme(2) API manual, so if you're reading this you're officially in section 2 territory. mwah, love that for us. 🎀💜 bye bestie, go make a completion queue or something 🌈