ENUM FRAME_MARK(9)

💅 enum frame_mark(9) — ok bestie, let's talk magics

Hiii so this is a page from the Kernel API Manual, section 9, and it's literally just a tiny little enum that exists to tell page paths and packet paths apart. That's it. That's the whole vibe. It's giving "small but crucial" energy ✨

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🌸 NAME 🌸

enum frame_mark — the magics that distinguish page paths from packet paths 🎀

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🦋 SYNOPSIS 🦋

enum frame_mark {
    MARK_XMIT ,
    MARK_IN ,
    MARK_SKB

};

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👑 CONSTANTS 👑

Three constants, three little icons, no cap:

• MARK_XMIT — this page got recycled because the frame was, quote unquote, "xmitted" by the NIC. She left the building. Bye 💨
• MARK_IN — the frame is currently being processed by the input XDP prog. She's busy, do not perceive her 🙈
• MARK_SKB — the frame did hit the TC ingress hook as an skb. She walked in through the skb door, fr fr 🚪

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🫶 SEE ALSO 🫶

Kernel file ./tools/testing/selftests/bpf/progs/test_xdp_do_redirect.c — go read it, iykyk 🔥

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💖 real talk: this enum is doing a lot of emotional labor for something with only three members. respect.

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ok that's the whole page, mwah 💋 this was enum frame_mark(9) from the Kernel API Manual, brought to you by the source ./tools/testing/selftests/bpf/... and dated October 2026 — slay, periodt, go read the selftest 🧚‍♀️💜