phy_caps_me...et_supported(9)

📦 version 7.3.1, in nixpkgs unstable

💖 phy_caps_medium_get_supported — NAME ✨

okay so bestie, this is a page from the Kernel API Manual, and the function we're stanning today is phy_caps_medium_get_supported — literally "returns linkmodes supported on a given medium" 🎀 that's the whole vibe, she tells you which linkmodes your medium can do.

🌸 SYNOPSIS 🌸

void phy_caps_medium_get_supported (unsigned long *supported , enum
ethtool_link_medium medium , int pairs );

that's it, that's the whole call. no return value, she just fills your buffer and dips 💅

🦋 ARGUMENTS 🦋

  • supported — the output param, the main character of this whole operation ✨ after the call, this holds all possible linkmodes on the given medium, and with the given number of pairs, or less. like, she's generous, she'll give you the under-pairs options too 🫶
  • medium — the medium you want the support info from. this is the "who are we asking about" of it all 💜
  • pairs — how many pairs are used on that given medium. lowkey important note: this only matters for modes that even support this notion, like BaseT. if it's not applicable to what you're doing, just pass 0 and move on 🙈

⭐ DESCRIPTION ⭐

okay so here's the one (1) behaviour detail you cannot miss: if no match exists, the supported field is left untouched. like, she doesn't clear it, she doesn't zero it, she doesn't touch it, periodt 💀 so whatever was in there before? still there. plan accordingly bestie 😭

🎀 SEE ALSO 🎀

the kernel file is ./drivers/net/phy/phy_caps.c — that's the source of truth, iykyk 👑

and the whole phy_caps friend group, all iconic, all worth a read:

🌈 okay that's the page!! this one lives over at ./drivers/net/phy, dated October 2026, from the Kernel API Manual — go forth and get those supported linkmodes, bestie, you got this 💖✨🎀

📦 where this page comes from