tb_tunnel_discover_pci(9)

📦 version 7.3.1, in nixpkgs unstable

💅 tb_tunnel_discover_pci — Kernel API Manual 🎀

okay bestie, welcome to tb_tunnel_discover_pci(9) — yes that's the section 9 kernel API manual, we're in the deep end and honestly? we're thriving. grab a strawberry 🍓 and let's go.

✨ NAME ✨

tb_tunnel_discover_pci — literally just discovers existing PCIe tunnels. that's the whole vibe. no cap. 🔥

🌈 SYNOPSIS 🌈

struct tb_tunnel * tb_tunnel_discover_pci (struct tb *tb , struct
tb_port *down , bool alloc_hopid );

yes she's a function that hands you back a struct tb_tunnel *, and yes the line break in the middle is exactly how the manpage has it, don't come for me 💀

🦋 ARGUMENTS 🦋

  • tb — pointer to the domain structure 🏠 (the whole neighborhood, basically)
  • down — the PCIe downstream adapter ⬇️
  • alloc_hopid — allocate HopIDs from visited ports 🎟️ like little tickets collected along the way

💖 DESCRIPTION 💖

so here's the tea ☕: if the down adapter is active, it follows the tunnel all the way to the PCIe upstream adapter — and then back again. 🔄 full round trip, main character energy, no shortcuts.

🌸 RETURN 🌸

you get a pointer to struct tb_tunnel 🫶 — or NULL if there was no tunnel at all. that's it. that's the return. 💀

⭐ SEE ALSO ⭐

the kernel file lives at ./drivers/thunderbolt/tunnel.c 📁 and honestly the friend group here is huge, so buckle up:

like I said. iconic turnout. 👑

sources say this page comes from ./drivers/thunderbolt and is dated October 2026 — so yeah, she's from the future, we stan a time traveler 🧚✨

okay that's the whole page bestie, go forth and discover those tunnels 💜🦋🎀

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