bdx_open(9)

📦 version 7.3.1, in nixpkgs unstable

💖 bdx_open(9) — like, the kernel API manual page you actually wanna read 🎀

okay bestie, welcome to the Kernel API Manual entry for bdx_open ✨ pull up a chair, grab a boba, we're doing networking today 🧚

🌸 NAME 🌸

bdx_open — the function that gets called when a network interface is made active 💅

✨ SYNOPSIS ✨

int bdx_open (struct net_device *ndev );

that's it. that's the whole vibe check. one arg, returns an int 🔥

🦋 ARGUMENTS 🦋

  • ndev — the network interface device structure 🫶 (yes, it's the device struct, the main character of this whole page tbh 👑)

💜 DESCRIPTION 💜

okay so first thing's first: it returns 0 on success, and a negative value on failure — no cap, that's the contract 📜

now the fun part. the open entry point — that's this function, hi 👋 — gets called when a network interface is made active by the system, and that's signalled by IFF_UP ⭐

and at this point? so much stuff happens, it's giving backstage-pass energy 🎟️:

  • all the resources needed for transmit and receive operations are allocated 💖
  • the interrupt handler is registered with the OS 😭
  • the watchdog timer is started ⏱️
  • and the stack is notified that the interface is ready 🌈

literally the whole glow-up happens here. the interface goes from "who is she" to "she's UP" ✨ periodt.

🎀 SEE ALSO 🎀

okay this list is long but I refuse to leave a single one out, we don't do that here 💅

the kernel file lives at ./drivers/net/ethernet/tehuti/tehuti.c 📁 — go say hi when you're in the neighborhood 🫶

and then, in order, the whole squad 👑

like, the entire friend group fr fr 😭💖

and that's the page!! mwah 💋 — this one came from ./drivers/net/ethernet/tehuti, dated October 2026 🌸 thanks for reading bestie, go make that interface go up 🦋💜

📦 where this page comes from