usb4_switch...ration_valid(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_switch_configuration_valid 💅

okay so bestie, welcome to the Kernel API Manual ✨ — yes we're literally reading kernel docs together, this is our bonding era 🫶. Today's main character is usb4_switch...ration_valid(9) (yeah the header truncates it, the full name is right below, don't panic 😭).

🌸 NAME 🌸

usb4_switch_configuration_valid — sets the tunneling configuration to be valid. that's it, that's the whole vibe 💖

✨ SYNOPSIS ✨

int usb4_switch_configuration_valid (struct tb_switch *sw );

🎀 ARGUMENTS 🎀

  • sw — the USB4 router. that's your lil guy, your router bestie, the one we're doing all this for 💅

🦋 DESCRIPTION 🦋

So what it does: it sets the configuration valid bit for the router. iconic. no cap.

Here's the part you actually need to remember though 👑:

You must call this before any tunnels can be set through the router, and after usb4_switch_setup has been called. order matters, bestie, it's giving prerequisite energy 🧚

And yes, it can be called on host routers and device routers — but for the host ones it does literally nothing (does nothing for the former). so like... call it, it just won't do anything there, no drama 💀

⭐ RETURN ⭐

  • 0 on success 🎉
  • negative errno otherwise 😭 (that's the "something went sideways" signal, check it fr fr)

🔥 SEE ALSO 🔥

Kernel file ./drivers/thunderbolt/usb4.c — plus this whole friend group of functions, all of them, yes all of them, I'm not skipping a single one 🙈:

and that's the whole page bestie!! 🌈 this lil gem lives in ./drivers/thunderbolt, and the date on the tin is October 2026 — so like, future vibes only 💜✨ go forth and set that valid bit, iykyk 🎀

📦 where this page comes from