ice_write_40...p_reg_eth56g(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ice_write_40b_ptp_reg_eth56g — a Kernel API Manual moment ✨

okay so bestie, welcome to the Kernel API Manual page for ice_write_40b_ptp_reg_eth56g(9) — yes that whole entire title, we're not abbreviating, we're not hiding it, it's the main character and it knows it 🎀

✨ NAME ✨

ice_write_40b_ptp_reg_eth56g — write a 40b value to the PHY 🦋

like, literally that's the whole job. write forty bits. to the PHY. slay.

🌸 SYNOPSIS 🌸

int ice_write_40b_ptp_reg_eth56g (struct ice_hw *hw , u8 port , u16
low_addr , u64 val );

(the line break in the middle of the declaration is not a vibe choice, that's just how the page renders it — copy it verbatim, don't @ me 💀)

💖 ARGUMENTS 💖

  • hw — pointer to the HW struct. the hardware. the whole situation. you hand her a pointer and she knows what to do 🫶
  • port — port to write to. which port, bestie? this one. that's the one 🔥
  • low_addr — offset of the low register. the low one. remember that, it's gonna matter in a sec 👀
  • val — the 40b value to write. forty bits of pure potential ✨

⭐ DESCRIPTION ⭐

so here's the tea ☕ — this function first does a vibe check on your low_addr. it checks if the caller has specified a known 40 bit register offset. if you did? iconic. if you didn't? we'll get to that in RETURN, bestie, don't worry 😭

once the offset passes, it writes the provided 40b value to the two associated registers by splitting it up into two chunks:

  • the lower 8 bits 🍓
  • the upper 32 bits 💜

that's it. that's the whole split. 8 + 32 = 40, the math is mathing, no cap 📐✨

👑 RETURN 👑

  • 0 — success 💅 you ate
  • EINVAL — not a 40 bit register 🙈 that's the vibe check failing babe, it means the offset you gave isn't a known 40 bit one
  • other — failed to write to PHY 😭 something else went sideways on the way to the hardware

🌈 SEE ALSO 🌈

okay this list is genuinely enormous and we are NOT skipping a single one of them, every name stays, in order, periodt 👑

and last but never ever least, the actual source file you should go read with your own two eyeballs:

  • Kernel file ./drivers/net/ethernet/intel/ice/ice_ptp_hw.c 🧚
lowkey a whole ecosystem of eth56g, e82x, e810 and e830 functions in that list, and every single one of them got their shoutout. we don't do "etc." here 💀

okay bestie that's the page!! this came to you from ./drivers/net/ethernet/intel/ice and it's dated October 2026 🌸 go forth, write your 40 bits, split them 8 and 32, and remember — if you get EINVAL, it's not you, it's the offset 💖 mwah 🫶✨

📦 where this page comes from