nvme_admin_passthru64(2)

✨ nvme_admin_passthru64 ✨

okay bestie so you know how we're always in the libnvme API manual? yeah. this is nvme_admin_passthru64(2) and it is literally THE girl for sending a 64-bit nvme passthrough command. she's giving "submit a 64-bit nvme passthrough command" and honestly? obsessed. 🫶

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💖 NAME 💖

nvme_admin_passthru64 — Submit a 64-bit nvme passthrough command. no cap, that's her whole thing. 💅

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🎀 SYNOPSIS 🎀

int nvme_admin_passthru64 (int fd , __u8 opcode , __u8 flags , __u16
rsvd , __u32 nsid , __u32 cdw2 , __u32 cdw3 , __u32 cdw10 , __u32 cdw11
, __u32 cdw12 , __u32 cdw13 , __u32 cdw14 , __u32 cdw15 , __u32 data_len
, void *data , __u32 metadata_len , void *metadata , __u32 timeout_ms ,
__u64 *result );

look at all those arguments. she's high maintenance but she's worth it. 🧚

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🌸 ARGUMENTS 🌸

• fd — the file descriptor of the nvme device. like, your in. your entry point. 🔑
• opcode — the nvme io command you're sending. this is the vibe you're selecting.
• flags — NVMe command flags. plot twist: not used. she's just there for the aesthetic. 💀
• rsvd — reserved for future use. so like, don't touch, it's saving that seat. 🙈
• nsid — namespace identifier. which namespace we're talking to, bestie.
• cdw2 — Command dword 2.
• cdw3 — Command dword 3.
• cdw10 — Command dword 10.
• cdw11 — Command dword 11.
• cdw12 — Command dword 12.
• cdw13 — Command dword 13.
• cdw14 — Command dword 14.
• cdw15 — Command dword 15.

notice how there's no cdw4 through cdw9? yeah. that's the lore. we don't ask. 💅

• data_len — length of the data transferred in this command, measured in bytes. 📏
• data — pointer to the user address of the data buffer. where the actual payload lives.
• metadata_len — length of metadata transferred in this command.
• metadata — pointer to the user address of the metadata buffer. the little sidecar of the data buffer, if you will.
• timeout_ms — how long the kernel waits for the command to complete. the patience setting. ⏳
• result — optional field to return the result from the CQE dword 0. optional!! so she can also just not. ✨

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🦋 DESCRIPTION 🦋

she's the parameterized form of nvme_submit_admin_passthru64, okay? so if that one is the main character, this one is the glow-up edition. 🌈

what she does: sets up and submits a struct nvme_passthru_cmd64. that's it. that's the whole job. she's efficient.

and like, known values for opcode are defined in enum nvme_admin_opcode, so if you're lost on what to put there, that's your study guide bestie. 📚

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⭐ RETURN ⭐

here's the tea: she gives you the nvme command status if a response was received (check enum nvme_status_field for what those mean, iykyk), or she hits you with a -1 with errno set otherwise. so like, either you got a status or you got humbled. no in-between. 😭

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vibe check: if you see -1, don't panic, just go read your errno. she's not being dramatic, she's being informative. 💜

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so yeah. that's nvme_admin_passthru64(2) from the libnvme API manual, July 2026, version nvme_admin_passthru64(2) — she ate and left no crumbs. go submit some passthrough commands responsibly, bestie. 👑💖✨