tipc_node_link_failover(9)

📦 version 7.3.1, in nixpkgs unstable

okay so this is a page from the Kernel API Manual — section 9, kernel developer vibes only, no cap 🫶 — and it's all about tipc_node_link_failover, which is the "help, we're stuck in half-failover" rescue function. bestie, this one is niche but it matters 💅

🌸 NAME 🌸

tipc_node_link_failover — start failover in case of "half-failover", iykyk 😭

🦋 SYNOPSIS 🦋

void tipc_node_link_failover (struct tipc_node *n , struct tipc_link *l
, struct tipc_link *tnl , struct sk_buff_head *xmitq );

literally the whole signature, don't @ me, copy it exactly 💖

🎀 ARGUMENTS 🎀

  • n — the tipc node structure 👑 like, the node herself, main character
  • l — link peer endpoint failingover — and yes, it can be NULL, so check it, bestie 🙈
  • tnl — the tunnel link, aka where the messages are gonna tunnel through 🌀
  • xmitq — queue for messages to be xmited on tnl link later 📬 (later!! not now!! patience)

💜 DESCRIPTION 💜

so this function is only called in a very special situation — and ngl it's kind of a weird one 😭 — where link failover can already be started on the peer node but not on this node. it's giving "one of us got the memo and the other one did not" 💀

here's how that mess happens, e.g.:

  1. Both links <1A-2A>, <1B-2B> down
  2. Link endpoint 2A up, but 1A still down (e.g. due to network disturbance, wrong session, etc.)
  3. Link <1B-2B> up
  4. Link endpoint 2A down (e.g. due to link tolerance timeout)
  5. Node 2 starts failover onto link <1B-2B>

and then the kicker:

==> Node 1 does never start link/node failover!

like... node 1 just never joins the party 😭 half-failover fr fr. that's the whole reason this function exists 🫶

🌈 SEE ALSO 🌈

go read these next, bestie, it's a whole cinematic universe ✨

okay and before you close the tab — tiny sign-off moment 🎀 this one lives over in ./net/tipc, and the page is dated October 2026. that's it, that's the footer, slay 💅✨

📦 where this page comes from