e1000_flush_desc_rings(9)

📦 version 7.3.1, in nixpkgs unstable

💅 e1000_flush_desc_rings — from the e1000 Kernel API Manual, bestie ✨

okay so real talk, this one is a little function with a huge job and i need you to respect it 🫶

🌸 NAME 🌸

e1000_flush_desc_rings — literally removes all the descriptors from the descriptor rings. every last one. gone. periodt 💅

✨ SYNOPSIS ✨

void e1000_flush_desc_rings (struct e1000_adapter *adapter );

🎀 ARGUMENTS 🎀

  • adapter — the board private structure, aka the whole vibe of the adapter, wrapped up in one pointer 🦋

💖 DESCRIPTION 💖

okay so on i219, the descriptor rings must be emptied before you reset the HW, or before you change the device state to D3 during runtime (runtime PM). not "should", not "maybe if you feel like it" — must 💀

and if you don't? the HW enters a unit hang state, and the only way out of that is a PCI reset on the device. no cap. that's the whole escape hatch. so like… just call the function, bestie 😭

lowkey treat this one as main character energy: empty the rings first, then reset or go to D3. the hang state is not a cute look 🙈

👑 SEE ALSO 👑

the kernel file we're living in: ./drivers/net/ethernet/intel/e1000e/netdev.c 🍓

and the whole friend group of related calls, fr fr:

🌸 mwah, that's the whole page 💖 this one's stamped from ./drivers/net/ethernet/intel/e... and dated October 2026, and it's still e1000_flush_desc_rings(9) — slay, go empty those rings 🎀✨

📦 where this page comes from