phy_caps_valid(9)

💅 phy_caps_valid — the phy_caps_valid(9) tea 🫶

So this is a page from the Kernel API Manual, bestie, and it's literally about checking whether a bunch of linkmodes actually work at a speed and duplex you hand it. Yes. That's the whole vibe check. ✨

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🌸 NAME 🌸

phy_caps_valid — validate a linkmodes set agains given speed and duplex

(that "agains" is the original's spelling, not me being chaotic, i prommy 💀)

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✨ SYNOPSIS ✨

bool phy_caps_valid (int speed , int duplex , const unsigned long
*linkmodes );

It returns a bool, takes an int speed, an int duplex, and a const unsigned long *linkmodes. That's it, that's the whole signature. 🎀

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🦋 ARGUMENTS 🦋

• speed — the input speed you wanna validate, bestie. Just... the speed. 🏃‍♀️
• duplex — the input duplex to validate. And listen 👑: passing DUPLEX_UNKNOWN is always not valid. Like, not "sometimes", not "depends" — always. No cap. 💀
• linkmodes — the linkmodes to validate. The actual set. The main character of this whole function, honestly. 🌟

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🔥 RETURN 🔥

true if at least one of the linkmodes in linkmodes can function at the given speed and duplex. Otherwise false. Simple as that, periodt. 💅

lowkey important: it's at least one — one single icon slaying at that speed and duplex is enough to make the whole thing true. ✨

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🌈 SEE ALSO 🌈

Kernel file ./drivers/net/phy/phy_caps.c — and the whole friend group fr fr:

• phy_caps_init(9)
• phy_caps_speeds(9)
• phy_caps_lookup_by_linkmode(9)
• phy_caps_lookup_by_linkmode_rev(9)
• phy_caps_lookup(9)
• phy_caps_linkmode_max_speed(9)
• phy_caps_linkmodes(9)
• phy_caps_from_interface(9)
• phy_caps_medium_get_supported(9)
• phy_caps_mediums_from_linkmodes(9)

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okay that's the whole page, mwah 💖 it lives under ./drivers/net/phy and the version stamp says October 2026 — so yeah, from the future, slay. 🧚🌸 Go validate some linkmodes, bestie. 🫶