phy_caps_linkmode_max_speed(9)

💅 phy_caps_linkmode_max_speed — the Kernel API Manual, section 9, bestie ✨

Okay so real quick: this page lives in the Kernel API Manual, section 9, and the star of the show is phy_caps_linkmode_max_speed. Yes it's a long name. No we're not shortening it. It's iconic and it earned it. 🎀

---

✨ NAME ✨

phy_caps_linkmode_max_speed — clamp a linkmodes set to a max speed. That's it, that's the whole vibe: you hand it a set of linkmodes, you hand it a ceiling, and it clamps. Like a bouncer for speeds. 🚪💅

---

🦋 SYNOPSIS 🦋

void phy_caps_linkmode_max_speed (u32 max_speed , unsigned long
*linkmodes );

Two arguments, zero return value (it's void, ngl it gives nothing back and that's on purpose). 🫶

---

🌸 ARGUMENTS 🌸

• max_speed — the speed limit for the linkmode set. Think of it as the ceiling, the cap, the "you shall not pass" number. Anything spicier than this gets clipped. 🔥
• linkmodes — the linkmodes to limit. This is the set getting clamped, fr fr. It's an unsigned long * pointer, so yes, it's getting modified in place. 👑

---

👑 SEE ALSO 👑

If you wanna go deeper (and honestly? you should, it's giving main character energy), this all lives in the kernel file ./drivers/net/phy/phy_caps.c, and it's besties with the whole crew:

• 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_valid(9)
• phy_caps_linkmodes(9)
• phy_caps_from_interface(9)
• phy_caps_medium_get_supported(9)
• phy_caps_mediums_from_linkmodes(9)

That's the whole group chat, no cap. 📋✨

---

Heads up bestie: every single one of those is a real reference, so if you're going linkmode-coded, read them all before you start guessing at behaviour. I said what I said. 💀

---

And that's the page! Sourced from ./drivers/net/phy, dated October 2026, filed under phy_caps_linkmode_max_speed(9). Slay, go clamp some speeds, mwah 💖🧚⭐