nvme_get_feature_length(2)

✨ nvme_get_feature_length(2) ✨

okay so bestie, welcome to the libnvme API manual 💖 this is the page for nvme_get_feature_length(2), and no cap, it's a lil cutie. it's one function, it does one thing, and it does it well. main character energy fr.

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🌸 NAME 🌸

nvme_get_feature_length — bestie, this is the one that retrieves the command payload length for a specific feature identifier. that's the whole vibe. you give it a feature, it tells you how many bytes you're working with. slay 💅

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🎀 SYNOPSIS 🎀

int nvme_get_feature_length (int fid , __u32 cdw11 , __u32 *len );

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🦋 ARGUMENTS 🦋

• fid — the feature identifier ✨ like, which feature are we even talking about? go check enum nvme_features_id if you need the whole roster, iykyk.
• cdw11 — okay so this __u32 value may affect the transfer. and before you panic: the only fid we know of where this matters is NVME_FEAT_FID_HOST_ID. that's it, that's the list 💀
• len — on success, this gets set to this feature's payload length in bytes 🍓 so it's the answer slot. you pass a pointer, it fills it in. iconic behavior honestly.

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🌈 RETURN 🌈

• 0 on success — we love to see it, everything went great, go off 👑
• -1 with errno set to EINVAL if the function did not recognize fid. so if you handed it a feature identifier it's never heard of, it's not gonna guess, it's gonna say no and set errno. not me getting rejected by a function 😭

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fr fr bestie, double-check your fid against enum nvme_features_id before you call this, or you're gonna be sitting there with an EINVAL wondering what went wrong 🙈

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and that's the whole page, periodt 💜 this absolute gem comes to you from the libnvme API manual, dated July 2026. tysm for reading, go forth and get those feature lengths, you got this 🫶🌸✨