xdp_build_skb_from_buff(9)

💅 xdp_build_skb_from_buff(9) 💅

okay so bestie, welcome to the Kernel API Manual — this page is literally all about xdp_build_skb_from_buff, and it's giving "glow-up from raw XDP buff to full skb" energy. come learn with me 🫶

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✨ NAME ✨

xdp_build_skb_from_buff — create an skb from &xdp_buff 💖

like, that's the whole gig. buff goes in, skb comes out. iconic.

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🌸 SYNOPSIS 🌸

struct sk_buff * xdp_build_skb_from_buff (const struct xdp_buff *xdp );

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🎀 ARGUMENTS 🎀

• xdp — the xdp_buff we're converting into an skb. that's the one, that's our main character 🦋

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💜 DESCRIPTION 💜

so what this does is perform all the common operations you need to create a new skb to pass up the stack from an xdp_buff — no cap, it's the whole pipeline:

• allocate an skb head from the NAPI percpu cache ✨
• initialize the skb data pointers and offsets
• set the recycle bit if the buff is PP-backed 👑
• set the Rx queue index
• set the protocol
• update frags info

basically it does all the boring-but-essential setup so your skb is ready to head upstairs to the stack. slay 💅

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🔥 RETURN 🔥

• new sk_buff on success 💖
• NULL on error 😭

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🌈 SEE ALSO 🌈

kernel file ./net/core/xdp.c, plus these besties:

• xdp_reg_page_pool(9)
• xdp_unreg_page_pool(9)
• xdp_rxq_info_attach_page_pool(9)
• xdp_return_frag(9)
• xdp_copy_frags_from_zc(9)
• xdp_build_skb_from_zc(9)
• bpf_xdp_metadata_rx_timestamp(9)
• bpf_xdp_metadata_rx_hash(9)
• bpf_xdp_metadata_rx_vlan_tag(9)

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and that's the page, periodt 🧚 this little gem lives in ./net/core and dropped in October 2026, filed under xdp_build_skb_from_buff(9) — go read it again whenever you need a vibe check, bestie 💀💖