nft_pipapo_a...lookup_4b_32(9)

📦 version 7.3.1, in nixpkgs unstable

👑 NAME 👑

nft_pipapo_avx2_lookup_4b_32 — the AVX2-based lookup for 32 four-bit groups, and yes bestie it's exactly as extra as it sounds 💅

Oh and hi, welcome to the Kernel API Manual — that's the manual we're in, no cap ✨

🦋 SYNOPSIS 🦋

int nft_pipapo_avx2_lookup_4b_32 (unsigned long *map , unsigned long
*fill , const struct nft_pipapo_field *f , int offset , const u8 *pkt ,
bool first , bool last );

🌸 ARGUMENTS 🌸

Okay so here's the whole cast, main character energy each one 🫶

  • map — the previous match result, used as the initial bitmap. It's giving the receipts from last time 💖
  • fill — the destination bitmap, and it's literally where we drop the current match result. This one gets filled, periodt.
  • f — the field, and it's holding the lookup and mapping tables like the group chat admin it is 👑
  • offset — ignore buckets before this given index, and no bits get filled there. Lowkey a do-not-disturb sign 🙈
  • pkt — the packet data, aka a pointer to the input nftables register. The actual tea ☕
  • first — if this is the first field, don't source the previous result. Fresh start, clean slate, new me ✨
  • last — last field behavior: stop at the first match and return the bit index. We're done here, no scrolling 💀

🎀 DESCRIPTION 🎀

See nft_pipapo_avx2_lookup_4b_2. That's it, that's the reference — go read your sibling's page bestie 😭

This one is used for 128-bit fields (i.e. IPv6 addresses). Sixteen bytes of pure vibe 🌈

🔥 RETURN 🔥

So like, three possible outcomes and you gotta know which one you got:

  • -1 on no match (we hate to see it 💀)
  • the rule index of match if it's last
  • otherwise, the first long word index to be checked next (i.e. the first filled word) — that's your next destination, go go go 🔥

⭐ SEE ALSO ⭐

The kernel file lives right here: ./net/netfilter/nft_set_pipapo_avx2.c — go read the source, it's iconic 👑

And the whole friend group, alphabetically-adjacent and thriving:

ngl this whole page came from ./net/netfilter, dated October 2026, and the page title got so long it literally got cut off to nft_pipapo_a...lookup_4b_32(9) — a true icon, we stan a truncated queen 💖✨🎀

k bye bestie, happy hashing 🦋💜

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