nft_pipapo_avx2_lookup_4b_8(9)

📦 version 7.3.1, in nixpkgs unstable

✨ nft_pipapo_avx2_lookup_4b_8 ✨

okay bestie so this is a page straight out of the Kernel API Manual (section 9, if you're keeping track) and it's all about nft_pipapo_avx2_lookup_4b_8 — the AVX2-based lookup for 8 four-bit groups 💅 no cap, that's the whole name in the NAME section and we're keeping it verbatim because it's iconic.

🌈 SYNOPSIS 🌈

int nft_pipapo_avx2_lookup_4b_8 (unsigned long *map , unsigned long
*fill , const struct nft_pipapo_field *f , int offset , const u8 *pkt ,
bool first , bool last );

look at her go 😭 seven args, returns an int, absolutely main character energy.

🎀 ARGUMENTS 🎀

okay so let's meet the cast:

  • map — the previous match result, and it gets used as the initial bitmap. it's giving "we already know some stuff, let's not start from scratch" 🫶
  • fill — the destination bitmap, aka where the current match result gets written. this one's the empty canvas 🎨
  • f — the field, and it's holding the lookup tables and the mapping tables. busy queen 👑
  • offset — ignore buckets before this given index, and fr fr no bits get filled there. like, don't even look at them 🙈
  • pkt — the packet data, 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, no baggage ✨
  • last — last field behavior: stop at the very first match and return the bit index. she's efficient 💅

🦋 DESCRIPTION 🦋

okay so the real explanation? see nft_pipapo_avx2_lookup_4b_2 — that's the lore, go read it, iykyk 📖

and this particular one is used for 32-bit fields, i.e. IPv4 addresses. yes, that's literally what it says, and yes, it's lowkey a slay 🌸

💖 RETURN 💖

so what does she give back:

  • -1 on no match 😭
  • the rule index of the match, if last is set 🔥
  • otherwise, the first long word index to be checked next (i.e. the first filled word) 👑

three possible vibes, one int. she's versatile.

ngl, remember that -1 means no match — don't go treating it as a valid index, bestie 💀

⭐ SEE ALSO ⭐

the whole friend group, and we're listing every single one because nobody gets left out 🫶

and that's the whole page, bestie 🧚 this one comes to you from ./net/netfilter, dated October 2026, and it's filed under nft_pipapo_avx2_lookup_4b_8(9) — periodt 💜

📦 where this page comes from