nft_pipapo_avx2_lookup_4b_4(9)

📦 version 7.3.1, in nixpkgs unstable

💅 nft_pipapo_avx2_lookup_4b_4 — from the Kernel API Manual, bestie 🎀

okay so picture this: it's a Tuesday, you're deep in net/netfilter, and you need an AVX2-based lookup for 4 four-bit groups. yeah. that one. this is the page for it, and honestly? it's giving legend behaviour. ✨

🌸 NAME 🌸

nft_pipapo_avx2_lookup_4b_4 — literally the AVX2-based lookup for 4 four-bit groups. that's the whole vibe. no cap. 💜

🦋 SYNOPSIS 🦋

int nft_pipapo_avx2_lookup_4b_4 (unsigned long *map , unsigned long
*fill , const struct nft_pipapo_field *f , int offset , const u8 *pkt ,
bool first , bool last );

🎀 ARGUMENTS 🎀

like, every single one of them. here we go, bestie 🫶

  • map — the previous match result, and it gets used as the initial bitmap. it's the before picture. 🙈
  • fill — the destination bitmap, and it's the one getting filled up with the current match result. it's the after picture. 💅
  • f — the field, and it's carrying the lookup and mapping tables. main character energy fr fr. 👑
  • offset — ignore buckets before the given index, and heads up: no bits are filled there. like, none. zero. don't come for that region. 💀
  • pkt — packet data, aka a pointer to the input nftables register. 🍓
  • first — if this is the first field, don't source the previous result. fresh start bestie, we're not bringing old baggage into this. 🌈
  • last — last field: stop at the first match and return the bit index. we're done, we're leaving, we're not looking back. ✨

🧚 DESCRIPTION 🧚

so, See nft_pipapo_avx2_lookup_4b_2. — that's the whole cross-reference, go read that one for the lore. iykyk.

and for the record: this is used for 16-bit fields (i.e. ports). 🎀 ports!! 16-bit!! the way that works!! 😭

🔥 RETURN 🔥

  • -1 on no match. nothing. nada. we go home empty-handed. 💀
  • rule index of match if last — like, you asked for the last one, you get the answer.
  • otherwise, the first long word index to be checked next (i.e. first filled word). it's a little pointer of a return value, showing you where to look next. 🫶

👑 SEE ALSO 👑

okay this is the whole group chat, everyone's here, no one got left on read:

and that's the page!! 💖 mwah 💖

huge slay sign-off: this one lives in ./net/netfilter and it's dated October 2026, so mark your calendars bestie, this manual page ate and left no crumbs. 🎀🦋💅

📦 where this page comes from