genphy_c45_read_link(9)

📦 version 7.3.1, in nixpkgs unstable

okay so bestie, welcome to the Kernel API Manual — page genphy_c45_read_link(9), coming at you live from the networking corner of the kernel 🦋. This one's a little function, but she's doing main character work: checking whether your link is actually up. Let's get into it ✨

✨ SYNOPSIS ✨

int genphy_c45_read_link (struct phy_device *phydev );

like, that's the whole vibe. one function, one argument, returns an int.

🎀 ARGUMENTS 🎀

  • phydev — the target struct phy_device. that's the phy you're pointing at, bestie. she's the one getting her link status read 💅

🌸 DESCRIPTION 🌸

okay so here's the tea ☕ — this function reads the link status from the specified MMDs. and if all of them are like "yeah we're up," then it sets phydev->link to 1. slay. 🎉

but listen — if an error gets encountered along the way, it returns a negative errno 😭. so negative = bad vibes, something went wrong. otherwise it returns zero, which is the good ending 🫶.

so like, quick recap of the return situation: negative errno on trouble, zero when everything's chill. no cap.

💀 friendly reminder that a 0 return does not mean the link is up — it means the call didn't error out. the actual up-ness lives in phydev->link. don't confuse the vibe check with the verdict, bestie.

👑 SEE ALSO 👑

the whole friend group 🫶 — starting with the kernel file these all live in: ./drivers/net/phy/phy-c45.c

like, the way that list just keeps going 😭 but every single one is here, periodt. go click through them, iykyk 💜

and that's the whole page, babe 🎀 she's sourced from ./drivers/net/phy, dated October 2026, and she lives in the Kernel API Manual as genphy_c45_read_link(9). go read some link status. slay 🔥👑

📦 where this page comes from