xdp_copy_frags_from_zc(9)

💅 xdp_copy_frags_from_zc(9) 💅

okay so bestie, welcome to the Kernel API Manual — this one's a function page, it's giving "quiet but essential", and honestly? we're obsessed 🫶

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✨ NAME ✨

xdp_copy_frags_from_zc — literally copies frags from an XSk buff over to an skb 🎀

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✨ SYNOPSIS ✨

bool xdp_copy_frags_from_zc (struct sk_buff *skb , const struct xdp_buff
*xdp , struct page_pool *pp );

like yes, that's the whole vibe check: it takes an skb, an xdp_buff, and a page_pool, and it hands you back a bool 🌸

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✨ ARGUMENTS ✨

• skb — the skb that the frags get copied into, bestie. it's the destination, the main character of this operation 👑
• xdp — the XSk xdp_buff where the frags are coming from. the source, the origin story 💜
• pp — the page_pool backing the page allocation, if available. (key words: "if available", don't forget it 🙈)

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✨ DESCRIPTION ✨

So here's what's going down: this function copies all the frags from the XSk xdp_buff into the skb, so the skb can be passed up the stack 🔥

And how does it do that, you ask? For each frag, it allocates a brand-new buffer, copies the frag in, and attaches it to the skb. one frag at a time, no shortcuts, no cap ✨

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✨ RETURN ✨

true on success 🎉 — and false on netmem allocation fail 💀 (that's the one and only failure case listed here, so clock it).

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🌈 SEE ALSO 🌈

• Kernel file ./net/core/xdp.c — yes, the source file itself is in the list, love that for us 🦋
• xdp_reg_page_pool(9)
• xdp_unreg_page_pool(9)
• xdp_rxq_info_attach_page_pool(9)
• xdp_return_frag(9)
• xdp_build_skb_from_buff(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)

like, read them, they're the whole friend group 🫶

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🎀 ngl, if literally any of this involves handing frags up the stack, pls double-check your allocation situation first — false means the netmem allocation failed, and that's a whole mood nobody wants 😭

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so that's the page, bestie 💖 this little cutie lives in ./net/core, the manual's stamped October 2026, and the whole thing is filed under xdp_copy_frags_from_zc(9) — slay, periodt, go read the kernel source 🌟