__igc_access_xmdio_reg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 __igc_access_xmdio_reg(9) — the Kernel API Manual, bestie edition 🎀

okay so welcome to the __igc_access_xmdio_reg</p> page from the Kernel API Manual ✨ this one's all about poking at an XMDIO register — yes, the whole function is literally just "read or write one XMDIO register" and honestly? iconic. short, sweet, does one thing. we love a focused main character 🫶

✨ NAME ✨

__igc_access_xmdio_reg — Read/write XMDIO register 💫

like, that's it. that's the whole gig. reading, writing, XMDIO, register. periodt 💅

🌸 SYNOPSIS 🌸

s32 __igc_access_xmdio_reg (struct igc_hw *hw , u16 address , u8
dev_addr , u16 *data , bool read );

it hands you back an s32 (no cap, that's the return type, it's right there) and it takes five things. four of them are info, one of them is a pointer you're gonna write through. bestie, be careful with that pointer 🙈

🦋 ARGUMENTS 🦋

  • hw — pointer to the HW structure 🧚 like, the whole hardware context, this is where everything lives
  • address — XMDIO address to program 🌸 the spot you're aiming at
  • dev_addr — device address to program 💖 which device we're talking to, noted as a u8 btw
  • data — pointer to value to read/write from/to the XMDIO address 👑 ok so this one's a pointer to a u16 and it's doing double duty — it's the value coming in when you write, and the value going out when you read. flexible! also means you better not hand it garbage, fr fr 😭
  • read — boolean flag to indicate read or write ⭐ literally the vibe check of the whole call: true means read, false means write. the whole behaviour of this function hinges on this one little bool, we stan a decisive king

🌈 SEE ALSO 🌈

first up, the actual source, in case you wanna go read the real thing (and honestly you should):

  • Kernel file ./drivers/net/ethernet/intel/igc/igc_phy.c 🍓

and then the whole friend group, all of them, in the order the manual gives them 💜:

nineteen whole cross-references, no skips, we listed every single one because that's what besties do 🫶

ok real talk: this page gives you the signature and the arg meanings, and that's it — no error codes listed here, no extra behaviour notes, so don't go inventing any. if you need the deep lore it's in igc_phy.c. iykyk 💀

and that's the page!! this lil beauty lives in ./drivers/net/ethernet/intel/igc, dated October 2026, and the manual itself calls it __igc_access_xmdio_reg(9). mwah 💋 slay, go read your registers responsibly ✨🎀

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