ixgbe_read_reg(9)

📦 version 7.3.1, in nixpkgs unstable

💖 ixgbe_read_reg(9) 💖

okay bestie, welcome to the Kernel API Manual ✨ this one's a little function with a big job: reading registers off an Intel ixgbe NIC without melting down when the card decides to dip out. let's get into it 🫶

🌸 NAME 🌸

ixgbe_read_reg — read from device register. that's it, that's the vibe 💅

⭐ SYNOPSIS ⭐

u32 ixgbe_read_reg (struct ixgbe_hw *hw , u32 reg );

look at her. returns a u32, takes two args. iconic 👑

🎀 ARGUMENTS 🎀

  • hw — all the hw-specific deets for this particular card. the personality file, basically 🌈
  • reg — the offset of the register you wanna read, i.e. which register. pick one, bestie 🦋

🔥 RETURN 🔥

it gives you back the value it read 💖 — or, plot twist, IXGBE_FAILED_READ_REG if the device got removed 😭

🧚 DESCRIPTION 🧚

okay so this is the function you call when you want to read device registers, fr fr. it does NOT just blindly trust the hardware.

the way it checks for device removal: if a read comes back as all ones, it confirms that by checking the status register value for all ones too. that's the double-check, no cap 🔍

and here's the slay part — if a removal was already detected previously, this function avoids reading from the hardware entirely and just hands you back IXGBE_FAILED_READ_REG (which is all ones). no wasted reads, no drama, periodt 💅

💀 lowkey important: IXGBE_FAILED_READ_REG is all ones, so if you see all ones coming back, don't act surprised — that's the "nope, she's gone" signal 🙈

🦋 SEE ALSO 🦋

the kernel file for this one lives at ./drivers/net/ethernet/intel/ixgbe/ixgbe_main.c 📁 — go look, iykyk.

and here's the whole friend group, all 118 of them, in the exact order they were handed to me 👑:

💜 ok that's the page, mwah 💜

quick sign-off bestie: this one came from the source path ./drivers/net/ethernet/intel/i... (yes it's truncated like that, that's how it was handed to me, don't come for me 🙈) and it's dated October 2026 — and the whole thing is filed under ixgbe_read_reg(9) 💖 go read some registers, but like, responsibly 🎀✨

📦 where this page comes from