ixgbevf_mta_vector(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ixgbevf_mta_vector — like, the kernel API manual bestie ✨

okay so this is a page from the Kernel API Manual (yes, that's the manual name, we're being official about it 🎀) and it's all about one tiny function that decides which bit-vector in the multicast table gets set. it's giving "small function, big responsibility" energy fr fr.

🌸 NAME 🌸

ixgbevf_mta_vector — determines the bit-vector in the multicast table to set. that's the whole job. she's focused. she's iconic. 👑

✨ SYNOPSIS ✨

s32 ixgbevf_mta_vector (struct ixgbe_hw *hw , u8 *mc_addr );

literally just hand her the hardware struct and a multicast address and she'll do her thing 🫶

🦋 ARGUMENTS 🦋

  • hw — pointer to the hardware structure. the main character of the operation ngl 💜
  • mc_addr — the multicast address. the vibe we're checking 🌈

🧚 DESCRIPTION 🧚

okay so here's the tea ☕ — this function extracts the 12 bits from a multicast address to figure out which bit-vector to set in the multicast table. no cap.

the hardware itself uses 12 bits, taken from incoming Rx multicast addresses, to determine which bit-vector to check in the MTA. and here's the fun part: there are 4 combinations of those 12-bits, and which one the hardware uses is set by the MO field of the MCSTCTRL. 😭

and the MO field? it gets set during initialization to mc_filter_type. so by the time she's doing the math, the setup's already been handled. slay. 💅

ngl this is the kind of stuff that just works and you never think about it until it doesn't 🔥

💖 SEE ALSO 💖

the kernel file herself: ./drivers/net/ethernet/intel/ixgbevf/vf.c — and honestly the whole friend group is here, so let's give them all their moment 💫

and that's the whole page bestie 🎀 coming at you from the kernel source at ./drivers/net/ethernet/intel/i... (yes it's truncated in the original, don't come for me 🙈) and dated October 2026. read it, love it, cite it. periodt. 💜⭐

📦 where this page comes from