bdx_close(9)

📦 version 7.3.1, in nixpkgs unstable

💅 bdx_close(9) — a Kernel API Manual moment

okay bestie so we're in the Kernel API Manual today and the page is bdx_close(9), which lowkey has main character energy because it's the "turn the interface off" girlie. let's get into it 🎀

✨ NAME ✨

bdx_close — Disables a network interface 🫶

like literally it disables it. that's the whole vibe.

🌸 SYNOPSIS 🌸

int bdx_close (struct net_device *ndev );

🦋 ARGUMENTS 🦋

  • ndev — the network interface device structure 💖 this is the thing you're closing, bestie, it's giving "the device struct" and it's not optional (there aren't any other arguments, so it's kinda the whole cast)

🔥 DESCRIPTION 🔥

Returns 0, periodt. this is not allowed to fail — no cap, it literally cannot fail, that's the contract 💀

So here's the lore: the close entry point gets called when an interface is de-activated by the OS. and ngl, the hardware is still under the driver's control at this point, but it needs to be disabled. so what happens? a global MAC reset is issued to stop the hardware, and then all transmit and receive resources are freed. iconic cleanup behaviour, honestly 👑

⚠️ heads up: the hardware is still under the driver's control here — it's not gone, it's just being disabled. don't get it twisted 💅

🌈 SEE ALSO 🌈

Kernel file ./drivers/net/ethernet/tehuti/tehuti.c and honestly the whole friend group:

okay that's the page!! 🍓 this one lives at ./drivers/net/ethernet/tehuti and it's stamped October 2026 — so yeah, mark your calendar bestie, go off, slay, close that interface 💜✨🧚

📦 where this page comes from