i40e_calc_nvm_checksum(9)

📦 version 7.3.1, in nixpkgs unstable

💖 i40e_calc_nvm_checksum(9) 💖

okay bestie, welcome to the kernel API manual page for i40e_calc_nvm_checksum — it lives in section 9, and it's honestly giving "quiet little helper that does one thing perfectly." 🎀

✨ NAME ✨

i40e_calc_nvm_checksum — calculates and returns the checksum 🧮

🌸 SYNOPSIS 🌸

int i40e_calc_nvm_checksum (struct i40e_hw *hw , u16 *checksum );

like... that's it. that's the whole vibe. two args, one int back. slay. 💅

🦋 ARGUMENTS 🦋

  • hw — pointer to hardware structure 🖥️ (yes, the actual hardware, not a metaphor, she's real)
  • checksum — pointer to the checksum 📍 (this is where the answer goes, so keep it safe)

👑 DESCRIPTION 👑

so here's the tea ☕ — this function calculates the SW Checksum that covers the whole 64kB shadow RAM, except for the VPD and PCIe ALT Auto-load modules. not those two. they're on their own ✌️

and why, you ask? because the structure and size of VPD is customer specific and unknown 😭 like nobody knows how big it's gonna be, it's a mystery, it's undefined behavior but make it fashion. therefore, this function skips all maximum possible size of VPD, which is 1kB. no cap. it just yeets past the whole 1kB and keeps going 🏃‍♀️💨

ngl the "we don't know how big it is so we're skipping the biggest it could possibly be" move is lowkey iconic. highkey safe. periodt. 🔥

🌈 SEE ALSO 🌈

okay this list is LONG, hydrate before reading 🍓 — first, the kernel file:

  • Kernel file ./drivers/net/ethernet/intel/i40e/i40e_nvm.c 💾

and then the whole friend group, fr fr:

thirty of them. THIRTY. and every single one made the cut 💀💖

and that's the whole page!! mwah 💋

shoutout to the source directory ./drivers/net/ethernet/intel/i40e, dated October 2026, and the manual i40e_calc_nvm_checksum(9) — that's the footer, bestie, we're done here 🫶✨ bye!! 🧚‍♀️

📦 where this page comes from