igb_write_8bit_ctrl_reg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 igb_write_8bit_ctrl_reg(9) — like, the whole page, bestie

okay so this is a page straight out of the Kernel API Manual and honestly? it's a little one but it eats. it's igb_write_8bit_ctrl_reg(9) and it does exactly one job, and it does it slayfully. let's get into it 🎀

✨ NAME ✨

igb_write_8bit_ctrl_reg — write an 8bit CTRL register. that's it. that's the whole vibe. 🦋

🌸 SYNOPSIS 🌸

s32 igb_write_8bit_ctrl_reg (struct e1000_hw *hw , u32 reg , u32 offset
, u8 data );

so she's a s32 returning girlie, and she takes four things. four! not three, not five. we love a precise queen 👑

💖 ARGUMENTS 💖

  • hw — pointer to the HW structure. yeah, the hardware struct, the main character of this whole situation. she's the struct e1000_hw * and she holds everything.
  • reg — a 32bit register offset, like E1000_SCTL. note the 32bit-ness, bestie, that part matters. 🔥
  • offset — the register offset you're writing to. yes it's also an offset. no we're not gonna be normal about it. 🙈
  • data — the actual data you're writing at that register offset. the payload. the moment. the reason we're all here. ⭐

🦋 DESCRIPTION 🦋

okay so what she does is she writes an address/data control type register. and here's the tea — there are several of these registers, and they all share the same format, no cap:

address << 8 | data

so the address gets shifted left by 8, then OR'd together with the data. that's the whole layout. iconic, honestly. 🫶

and then — this is the important bit — bit 31 is polled for completion. so like, she's not just gonna yeet the write and dip. bit 31 is the vibe check. when bit 31 says we're done, we're done. periodt. 👑

🌈 SEE ALSO 🌈

first up, the kernel file where this whole thing actually lives — go look at it, it's right there:

./drivers/net/ethernet/intel/igb/e1000_mac.c

and now the friend group. the whole squad. every single one of them, in the order they were presented, because we do not skip people in this house 💜:

like, that's the whole igb extended universe. go read them. iykyk 💅

ngl this one's short but she's efficient, and honestly efficiency is so attractive. go write your 8bit CTRL registers responsibly bestie 💖

mwah, that's the page 🎀 it comes to you from ./drivers/net/ethernet/intel/igb and it's dated October 2026 — so it's basically from the future, which is very main character energy of it. see u in the next manpage, love u, bye 🦋✨

📦 where this page comes from