e1000_flush_tx_ring(9)

📦 version 7.3.1, in nixpkgs unstable

💅 e1000_flush_tx_ring(9) ✨

okay so this is a page from the Kernel API Manual — section 9, kernel developer stuff, iykyk 🫶 — and it's all about one very specific little function: e1000_flush_tx_ring. let's get into it bestie 🌸

🌈 NAME 🌈

e1000_flush_tx_ring — remove all descriptors from the tx_ring 💅 (yes, all of them. we're clearing house.)

🦋 SYNOPSIS 🦋

void e1000_flush_tx_ring (struct e1000_adapter *adapter );

that's it. that's the whole signature. no cap. ✨

🎀 ARGUMENTS 🎀

  • adapter — the board private structure 🫶 (it's the adapter's own lil private club of struct-y data, and we need it to know which board we're talking to)

💖 DESCRIPTION 💖

okay so picture this: we want to clear all pending descriptors from the TX ring. that's the whole assignment. the vibe check is: ring? empty it. 🔥

the zeroing happens when the HW reads the regs 👀 — like, the hardware does the actual zeroing on its own when it goes and reads those registers, so we're not out here doing it by hand.

and here's the little trick: we assign the ring itself as the data of the next descriptor. yep, the ring becomes its own data. main character energy fr fr 🌟

do we care about that data? absolutely not 💀 — "We don't care about the data we are about to reset the HW." we're resetting the hardware anyway, so that data is not the moment. it's giving sacrificial placeholders. 🙈

👑 SEE ALSO 👑

first up, the source file, bestie:

Kernel file ./drivers/net/ethernet/intel/e1000e/netdev.c 🦋

and now the extended universe of related functions, all in section 9, all iconic in their own right 🌸:

like, the whole e1000e friend group showed up. obsessed. 🫶✨

and that's the page!! mwah 💋 — this lil cutie came out of ./drivers/net/ethernet/intel/e... (the path gets truncated in the footer, she's mysterious like that 🌸) and the date on it is October 2026. go forth and flush those TX ring descriptors bestie, you're gonna slay 💅👑

📦 where this page comes from