libnvme_mi_control(9)

📦 version 3.2, in arch rolling

💅 libnvme_mi_control — bestie's guide to the Control Primitive command

okay so this is a page from the libnvme API manual — yes the whole libnvme thing, we're in the big leagues now — and it's about one very specific little function called libnvme_mi_control. it does exactly one thing and it does it slay, so let's get into it 🫶

✨ NAME ✨

libnvme_mi_control — perform a Control Primitive command 🎀

like, that's the whole job. one command, one vibe.

🌸 SYNOPSIS 🌸

int libnvme_mi_control (struct libnvme_mi_ep *ep , __u8 opcode , __u16
cpsp , __u16 *result_cpsr );

that's the signature, no cap — copy it exactly if you're typing it out, don't be out here freehanding it 💀

🦋 ARGUMENTS 🦋

  • ep — the endpoint for MI communication. this is your whole connection situation, the line to the other side, the main character of the transport layer 👑
  • opcode — the Control Primitive opcode. and it's not just some random byte, it's the byte from enum nvme_mi_control_opcode, so like, use the enum, bestie, it's there for a reason 🌈
  • cpsp — the Control Primitive Specific Parameter. yes it's really called that. yes the acronym is doing a lot. it's a __u16 ✨
  • result_cpsr — optional field to return the result from the CPSR field. key word optional, so if you're not interested in the result you can just pass nothing and keep it moving 🙈

💖 DESCRIPTION 💖

so what does it actually do. it performs a Control Primitive command, using the opcode that you specified in opcode. that's it, that's the tea ☕

and then — the good part — it stores the result from the CPSR field in result_cpsr, if set. so if you passed a real pointer, congrats, you get the goodies back. if you didn't, no result for you, but also no crash, so honestly? fair 🫶

see also the enum nvme_mi_control_opcode — that's where your valid opcode values live, so go look at it before you start guessing numbers fr fr ⭐

🔥 RETURN 🔥

  • 0 on success 🎉
  • negative error code otherwise 😭

so yeah, check the return value. always. every time. it's giving "trust but verify" energy 💅

and that's the page!! 🧚 go forth and control-primitive your way through the MI layer, you've got this 💜

sign-off kissies: this was the libnvme API manual, the libnvme_mi_control(9) page, dated October 2026 — see you in the next man page bestie, mwah 🍓

📦 where this page comes from