nfp_cpp_area_write(9)

📦 version 7.3.1, in nixpkgs unstable

💅 nfp_cpp_area_write(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: you've got a CPP area and you need to shove some data into it. that's it. that's the function. welcome to nfp_cpp_area_write, pulled straight out of the Kernel API Manual and delivered to you with love 💖

✨ SYNOPSIS ✨

int nfp_cpp_area_write (struct nfp_cpp_area *area , unsigned long offset
, const void *kernel_vaddr , size_t length );

like, yes, the line break is weird, no, we're not fixing it, it's iconic 💀

🌸 ARGUMENTS 🌸

  • area — your CPP area handle 🫶 the main character of this whole operation
  • offset — how far into the CPP area you're going. yes it's an offset. yes you need it.
  • kernel_vaddr — the kernel address you're reading data from ⭐ (the data's home base, basically)
  • length — how many bytes you're writing. the byte count. the whole vibe check. 📏

💜 DESCRIPTION 💜

Write data to the indicated CPP region. that's the tea ☕ you hand it a source, a destination offset, and a length, and it literally just writes the bytes fr fr.

⚠️ NOTE ⚠️

bestie please read this one, i'm begging 🙈

offset and length must be 32-bit aligned values. not "roughly aligned", not "aligned-ish" — 32-bit aligned, periodt. 👑

And the area must have been locked down with an 'acquire' first. no acquire, no write. that's the rule. 💅

🔥 RETURN 🔥

length of io, or -ERRNO 😭 (so like, if it goes badly you get a negative errno and you get to go debug it, slay)

👑 SEE ALSO 👑

the source of truth, the kernel file itself:

./drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c

and now, the extended family 💖 (they're all in here, every single one, no cap):

and that's the whole page, bestie 🦋

<cute sign-off>this lil masterpiece comes to you from the source ./drivers/net/ethernet/netrono... and it's dated October 2026 — yes, the future. we're ahead of schedule. periodt 💅✨</cute sign-off>

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