ENUM TB_TUNNEL_EVENT(9)

💖 enum tb_tunnel_event(9) 💖

okay so bestie, welcome to the Kernel API Manual page for enum tb_tunnel_event — Tunnel related events. yes it's an enum, yes it's about Thunderbolt tunnels, and yes we're gonna get through it together 🫶

✨ NAME ✨

enum tb_tunnel_event — Tunnel related events

🌈 SYNOPSIS 🌈

enum tb_tunnel_event {
    TB_TUNNEL_ACTIVATED ,
    TB_TUNNEL_CHANGED ,
    TB_TUNNEL_DEACTIVATED ,
    TB_TUNNEL_LOW_BANDWIDTH ,
    TB_TUNNEL_NO_BANDWIDTH

};

like, that's the whole enum, she's short and she's iconic 💅

🎀 Constants 🎀

okay so these are the actual values, and each one is literally a whole mood. let's go one by one:

• TB_TUNNEL_ACTIVATED — A tunnel was activated ✨ like she's UP, she's live, she's doing her thing.
• TB_TUNNEL_CHANGED — There is a tunneling change in the domain. Includes full TUNNEL_DETAILS if the tunnel in question is known — but bestie, note the caveat: ICM does not provide that information 🙈 so if it's ICM you're not getting the details, fr fr.
• TB_TUNNEL_DEACTIVATED — A tunnel was torn down 😭 rip tunnel, gone but not forgotten.
• TB_TUNNEL_LOW_BANDWIDTH — Tunnel bandwidth is not optimal 💀 like it's working but it's giving "loading…" energy.
• TB_TUNNEL_NO_BANDWIDTH — There is not enough bandwidth for a tunnel 🫠 the tunnel is not tunnel-ing, sorry.

🦋 SEE ALSO 🦋

go check out the kernel file ./drivers/thunderbolt/tunnel.h (that's where the source lives, iykyk) plus these certified besties:

• enum tb_tunnel_state(9)
• struct tb_tunnel(9)
• tb_tunnel_is_active(9)

and that's the page!! 💖 this little gem comes to you from ./drivers/thunderbolt in the October 2026 edition — slay, periodt, go read your kernel headers 👑🌸