icssg_prueth..._fdb_add_del(9)

📦 version 7.3.1, in nixpkgs unstable

💅 icssg_prueth..._fdb_add_del(9) — the group-chat version 🎀

okay bestie, so this is a page from the Kernel API Manual, and the function we're obsessing over is icssg_prueth_hsr_fdb_add_del ✨ (yes the header up top is icssg_prueth..._fdb_add_del(9), the kernel just loves a dramatic abbreviation, iykyk). it lives in the land of HSR multicast and it's literally the bouncer for FDB port membership 🌈

✨ NAME ✨

icssg_prueth_hsr_fdb_add_del — Manage FDB port membership for HSR multicast 💖

like, that's the whole vibe. it manages the FDB port membership. for HSR multicast. periodt 🌸

🦋 SYNOPSIS 🦋

void icssg_prueth_hsr_fdb_add_del (struct prueth_emac *emac , const u8
*addr , u8 vid , bool is_synced , bool is_vlan_path , bool add );

note the void — she returns nothing, she just does 💅

🎀 ARGUMENTS 🎀

six args, no skips, let's go 😭

  • emac — PRUETH EMAC private data. the main character's personal stash of internals 🫶
  • addr — multicast MAC address. yes, multicast, keep that in mind 👑
  • vid — VLAN ID 🧚
  • is_synced — true if synced from HSR master, false if added directly 🔥
  • is_vlan_path — true if called from VLAN interface path, false for direct path 🦋
  • add — true to add/update, false to remove. the whole plot twist lives in this bool 💀

🌟 DESCRIPTION 🌟

so what does she actually do? she manages the FDB port membership bits — that's P0/P1/P2 — for multicast addresses ✨

  • on add: it accumulates membership with existing ports 🌸 (not me just adding to what's already there, no cap)
  • on delete: it removes only the specific port, and cleans up orphaned P0 if needed 🧹
lowkey important: the delete side is surgical. only the specific port gets the boot, and the orphaned P0 cleanup is a whole separate little rescue mission 🙈

💜 SEE ALSO 💜

kernel file: ./drivers/net/ethernet/ti/icssg/icssg_prueth.c — go read it, it's giving source-of-truth ⭐

the whole friend group of related functions (squad, fr fr):

and that's the page bestie 🎀 sign-off time: this one comes from ./drivers/net/ethernet/ti/icssg, dated October 2026, filed under icssg_prueth..._fdb_add_del(9) 🌈 ily, go manage some FDB membership bits 💖

📦 where this page comes from