i40e_ptp_restore_hw_time(9)

📦 version 7.3.1, in nixpkgs unstable

✨ i40e_ptp_restore_hw_time ✨

okay bestie, quick vibe check before we dive in: this is a page from the Kernel API Manual, and the star of the show is i40e_ptp_restore_hw_time(9). she's a tiny function with one job and honestly? she ate. 💅

🎀 NAME 🎀

i40e_ptp_restore_hw_time — put the ptp_prev_hw_time plus the delta back into the PTP regs 🫶

🌸 SYNOPSIS 🌸

void i40e_ptp_restore_hw_time (struct i40e_pf *pf );

🦋 ARGUMENTS 🦋

  • pf — the board private structure, aka the main character of this whole situation ✨

💖 DESCRIPTION 💖

so what are we actually doing here? we're restoring the PTP hardware clock registers, no cap. earlier in the timeline we cached the PTP hardware time as pf->ptp_prev_hw_time — that's the saved snapshot, our little screenshot of the past 📸

and like, to be as accurate as possible, we update that value based on the time delta since the time was saved. the way we do that is with CLOCK_MONOTONIC (via ktime_get) to calculate the time difference. lowkey genius tbh 🧚

this ensures that the hardware clock is restored to nearly what it should have been if a reset had not occurred. so like, the vibe is preserved even when the hardware decided to have a moment 😌

🔥 SEE ALSO 🔥

Kernel file ./drivers/net/ethernet/intel/i40e/i40e_ptp.c — the source, the mothership, the whole reason we're here 💜

and the full friend group, in order because we don't do chaos (well, mostly):

ngl, that's a lot of cross-references, but every single one is here and accounted for — nothing got left on read 💀

and that's the whole page, bestie! 🍓 this one lives in ./drivers/net/ethernet/intel/i40e, dated October 2026, in the Kernel API Manual — go off, timestamps 👑🌈

mwah, ty for reading, ily, stan PTP 💖

📦 where this page comes from