tb_tunnel_match_dma(9)

📦 version 7.3.1, in nixpkgs unstable

✨ tb_tunnel_match_dma — the kernel API manual, bestie edition ✨

Okay so we're in tb_tunnel_match_dma(9) today, and honestly? She's a little function with a big job and I'm obsessed 💅 This one lives in the Kernel API Manual, so grab your iced coffee and let's get into it.

🌸 NAME 🌸

tb_tunnel_match_dma — Match DMA tunnel 🎀

Like, she matches. That's the whole vibe. Moving on.

🦋 SYNOPSIS 🦋

bool tb_tunnel_match_dma (const struct tb_tunnel *tunnel , int
transmit_path , int transmit_ring , int receive_path , int receive_ring
);

Look at her. Five arguments, returns a bool, no cap. Copy it exactly if you're typing it out, bestie, don't be "creative" with it 🙈

🌈 ARGUMENTS 🌈

  • tunnel — Tunnel to match. Yeah, the actual tunnel you're sussing out. Main character energy, obviously 👑
  • transmit_path — HopID used for transmitting packets. Pass -1 to ignore. Yep, -1 is the "idc about this one" wildcard 🫶
  • transmit_ring — NHI ring number used to send packets towards the other domain. Pass -1 to ignore. Same deal, -1 means "not today" ✨
  • receive_path — HopID used for receiving packets. Pass -1 to ignore. You already know the -1 thing by now, iykyk 💀
  • receive_ring — NHI ring number used to receive packets from the other domain. Pass -1 to ignore. Fourth time's the charm, literally 🍓

💖 DESCRIPTION 💖

So here's the situation: this function can be used to match a specific DMA tunnel, if there are multiple DMA tunnels going through the same XDomain connection. Like when there's a whole group chat of tunnels and you need to find the exact one — that's her. She's the one who knows who's who 🔥

No guessing, no vibes-only matching. She matches for real.

⭐ RETURN ⭐

  • true if there is a match 🌸
  • false otherwise 💀

That's it. Binary queen. Periodt.

🧚 SEE ALSO 🧚

Kernel file ./drivers/thunderbolt/tunnel.c, plus the whole friend group:

Go say hi to all of them, they're all iconic 💜

And that's the page!! Big shoutout to ./drivers/thunderbolt for being the source, October 2026 for the date, and tb_tunnel_match_dma(9) for the version stamp at the bottom of the original — you're all doing amazing, sweetie 🫶🎀✨
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