usb4_port_sw_margin_errors(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_port_sw_margin_errors — Kernel API Manual

okay so bestie, welcome to the usb4_port_sw_margin_errors(9) page ✨ this is a Kernel API Manual entry, and honestly it's short and sweet — a little function that literally just reads back your software margining error counters from the port. no drama, no cap. 🎀

🌸 SYNOPSIS 🌸

int usb4_port_sw_margin_errors (struct tb_port *port , enum
usb4_sb_target target , u8 index , u32 *errors );

that's the whole vibe check: it takes a port, a sideband target, an index, and a place to shove the errors 💖 returns an int, iconic.

✨ ARGUMENTS ✨

  • port — the USB4 port 🌈 this is the main character here, the thing you're margining.
  • target — the sideband target 👑 like, who are we even talking to on the sideband rn.
  • index — the retimer index, but only if target is USB4_SB_TARGET_RETIMER 🧚 otherwise it's just kinda... there, bestie.
  • errors — error metadata gets copied here 📥 pointer incoming, that's where the tea lands.

💜 DESCRIPTION 💜

so what does it actually do? it reads back the software margining error counters from the port. that's it. that's the whole thing 🫶 ngl sometimes a function is just a function and this one ate and left no crumbs.

⭐ RETURN ⭐

  • 0 on success 🎉 slay.
  • a negative errno otherwise 😭 so like, check it, always check it.

🦋 SEE ALSO 🦋

the kernel file lives at ./drivers/thunderbolt/usb4.c — go say hi 💅 and here's the whole friend group, all (9)s, all present and accounted for:

and that's the whole page, bestie 🫶 go read your error counters, get your data, live your truth 🌈

this lil love letter came from the <pink>./drivers/thunderbolt</pink> corner of the kernel, dated October 2026 — mwah, catch you on the next manpage 💋🎀

📦 where this page comes from