genphy_c45_read_lpa(9)

📦 version 7.3.1, in nixpkgs unstable

💖 genphy_c45_read_lpa (9) — Kernel API Manual, bestie edition 💖

okay so welcome to the group chat, the manual name is literally genphy_c45_read_lpa(9) and today we're reading the link partner's whole vibe. no cap.

✨ NAME ✨

genphy_c45_read_lpa — read the link partner advertisement and pause 🫶

🦋 SYNOPSIS 🦋

int genphy_c45_read_lpa (struct phy_device *phydev );

🎀 ARGUMENTS 🎀

  • phydev — the target phy_device struct. that's the main character right there 👑

🌸 DESCRIPTION 🌸

okay so picture this: we read the Clause 45 defined base (7.19) and 10G (7.33) status registers, and we fill in the link partner advertisement, pause and asym_pause members in phydev. the way that it just… populates the struct. iconic. 💅

key deets, bestie, don't skip:

  • this assumes that the auto-negotiation MMD is present ✨
  • and that the backplane bit (7.48.0) is clear ✨
  • Clause 45 PHY drivers are expected to fill in the remainder of the link partner advert from vendor registers — like yes, do the rest yourself, we only did the base and 10G part 🙈

no cap, that's the whole job. slay.

⭐ reminder: the assumptions above are load-bearing. auto-negotiation MMD present, backplane bit 7.48.0 clear. don't come for me if you skip those.

💜 SEE ALSO 💜

the kernel file is ./drivers/net/phy/phy-c45.c, and here's the whole friend group 🔥:

and that's the page, bestie 🧚 this one lives in ./drivers/net/phy, dated October 2026 — go read your PHYs, ily, mwah 💋

📦 where this page comes from