nft_pipapo_avx2_lookup_8b_4(9)

📦 version 7.3.1, in nixpkgs unstable

💅 nft_pipapo_avx2_lookup_8b_4(9) — the Kernel API Manual glow-up ✨

okay so bestie, buckle up, because we're about to read a kernel function signature like it's the group chat 😌 this one lives in the Kernel API Manual and it's genuinely iconic if you're into netfilter stuff 🦋

✨ NAME ✨

nft_pipapo_avx2_lookup_8b_4 — the AVX2-based lookup for 4 eight-bit groups, no cap 💅

🌸 SYNOPSIS 🌸

int nft_pipapo_avx2_lookup_8b_4 (unsigned long *map , unsigned long
*fill , const struct nft_pipapo_field *f , int offset , const u8 *pkt ,
bool first , bool last );

like, that's the whole vibe right there: it returns an int, and it takes all those params, periodt 🎀

🎀 ARGUMENTS 🎀

  • map — previous match result, used as the initial bitmap 🫶 like it already did the work and now we're building on it
  • fill — the destination bitmap that gets filled with the current match result 💖 this is where the tea gets poured
  • f — the field, containing the lookup and mapping tables 👑 the main character struct fr
  • offset — ignore buckets before the given index, and ngl no bits are filled there 🙈
  • pkt — the packet data, aka a pointer to the input nftables register 🍓
  • first — if this is the first field, don't source the previous result 💀 literally a fresh start
  • last — last field energy: stop at the first match and return the bit index ⭐

🦋 DESCRIPTION 🦋

so like, just go see nft_pipapo_avx2_lookup_4b_2 for the full lore, iykyk 📖

this one is used for 32-bit fields (i.e. IPv4 addresses) 🌈 lowkey iconic of it

🔥 RETURN 🔥

  • -1 on no match 😭
  • the rule index of the match, if last 💖
  • otherwise, the first long word index to be checked next (i.e. the first filled word) ✨
like bestie, read those three carefully, because the return value literally changes shape depending on last — that's not me being dramatic, that's just the contract 💅

👑 SEE ALSO 👑

kernel file ./net/netfilter/nft_set_pipapo_avx2.c — the source of truth 🧚

and the whole friend group:

okay that's the whole page, and fr fr you ate it 🫶 this one's brought to you by ./net/netfilter, October 2026, and nft_pipapo_avx2_lookup_8b_4(9) — slay, go read the source, mwah 💜🎀

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