bcm_config_lre_advert(9)

✨ bcm_config_lre_advert(9) ✨

okay so bestie, welcome to the kernel API manual 💅 this one is a little helper from the bcm PHY corner of the kernel, and honestly it's giving "quietly does one very specific job and does it well" energy 🎀

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🌸 NAME 🌸

bcm_config_lre_advert — sanitize and advertise Long-Distance Signaling auto-negotiation parameters ✨

🦋 SYNOPSIS 🦋

int bcm_config_lre_advert (struct phy_device *phydev );

💖 ARGUMENTS 💖

• phydev — the target phy_device struct 🫶 like, the PHY you're doing this to

👑 RETURN 👑

• 0 — the PHY's advertisement hasn't changed, no cap 💀
• < 0 — error, something went sideways 😭
• > 0 — it has changed, slay 🔥

🌈 DESCRIPTION 🌈

So what it actually does: it writes MII_BCM54XX_LREANAA with the appropriate values ✨

The values are supposed to be sanitized beforehand, so we make sure we only ever advertise what's actually supported 🧚 this is the important bit, don't skip it.

And the sanitization? Already done, bestie — it happens in phy_ethtool_ksettings_set 💅 so by the time this runs, the vibes are already checked.

🍓 SEE ALSO 🍓

• Kernel file ./drivers/net/phy/bcm-phy-lib.c
• bcm_linkmode_adv_to_lre_adv_t(9)

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and that's the whole page, iconic honestly 💜 this one lives in ./drivers/net/phy and the manual's dated October 2026 — mwah, go read the source, iykyk 🌟