nvme_mi_mi_xfer(2)

💖 nvme_mi_mi_xfer(2) 💖

okay bestie, so this one lives in the libnvme API manual and it's literally the raw, unfiltered MI transfer interface. no cap. it's giving "I speak directly to the hardware and I don't apologise for it" energy 💅

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✨ NAME ✨

nvme_mi_mi_xfer — raw MI transfer interface, periodt.

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🌸 SYNOPSIS 🌸

int nvme_mi_mi_xfer (nvme_mi_ep_t ep , struct nvme_mi_mi_req_hdr *mi_req
, size_t req_data_size , struct nvme_mi_mi_resp_hdr *mi_resp , size_t
*resp_data_size );

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🎀 ARGUMENTS 🎀

• ep — the endpoint you're sending the MI command to. that's your girl, that's the destination 🫶
• mi_req — the request data. your whole ask, right here.
• req_data_size — how big the request data payload is. size matters, we love a specific number ✨
• mi_resp — the buffer where the response data goes to live. make it cozy.
• resp_data_size — the size of your response data buffer, and then it gets updated to the size actually received. she updates herself. main character behaviour, honestly 👑

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🦋 DESCRIPTION 🦋

So what it does: it performs an arbitrary NVMe MI command, using the request data you handed it in mi_req. and the size of the request data payload goes in req_data_size — and eyes here, because this does not include the standard header length. so a header-only request? size of 0. yes, zero. that's not a typo, that's just the vibe 💀

also lowkey important: the Management Request Doublewords are considered part of the header data. so do not come for req_data_size with those, bestie. it's counted already. 🌈

On success 🎉 the response data is stored in mi_resp, and that thing has an optional appended payload buffer of resp_data_size bytes. the actual payload size that got transferred will land in resp_data_size, and ngl that size does not include the MI response header either — so 0 means no payload at all. consistent queen. same rules, both directions. 💖

See: struct nvme_mi_mi_req_hdr and struct nvme_mi_mi_resp_hdr. go look at them, they're right there, they're iconic 🧚

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⭐ RETURN ⭐

So what does she give back? if a response was received, you get the nvme command status (check enum nvme_status_field, that's the one). otherwise you get -1 and errno gets set. classic. 🙈

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fr fr, if you get -1, don't spiral — just check errno. she's telling you something. 💅

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and that's the whole page, bestie! 🍓 this little legend comes from the libnvme API manual, dated July 2026, filed under nvme_mi_mi_xfer — mwah, slay, no notes 👑✨🌈