STRUCT LIBETH_FQE(9)

💅 struct libeth_fqe(9) — like, the whole tea ☕

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for struct libeth_fqe, which is literally the glow-up name for an Rx buffer. Yeah. A fill queue element. Obsessed already, right? 🎀

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🌸 NAME 🌸

struct libeth_fqe — the structure that reps an Rx buffer (aka a fill queue element). That's the whole vibe. 💖

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✨ SYNOPSIS ✨

here's the struct, copy it exactly bestie, no autocorrect:

struct libeth_fqe {
    netmem_ref netmem;
    u32 offset;
    u32 truesize;
};

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🦋 Members 🦋

• netmem — the network memory reference that's holding onto the buffer. it's giving main character energy, it's the actual memory holder 🫶
• offset — the offset from the page start, pointing at the headroom. iykyk 🌈
• truesize — the total space the buffer occupies, headroom and tailroom included. the full fit, no cap 💅

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👑 Description 👑

so depending on the MTU, the API lowkey switches between two models: one-page-per-frame and the shared page model (that second one exists to conserve memory on bigger-page platforms — iconic, honestly 🧚).

in the one-page-per-frame case? offset is always 0, and truesize is always PAGE_SIZE. periodt. 🎀

fr fr, that's the whole description — don't go inventing extra lore, bestie 😭

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🌟 SEE ALSO 🌟

go read these next, they're all linked and they all ate 🔥:

• Kernel file ./include/net/libeth/rx.h
• enum libeth_fqe_type(9)
• struct libeth_fq(9)
• libeth_rx_alloc(9)
• libeth_rx_sync_for_cpu(9)
• struct libeth_rx_csum(9)
• struct libeth_rqe_info(9)
• libeth_rx_pt_get_ip_ver(9)
• libeth_rx_pt_set_hash(9)

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okay that's the page!! source is ./include/net/libeth, dated October 2026 — so go forth, read your struct, and slay 💖✨🦋🍓

mwah 💋