nfp_cpp_area_read(9)

📦 version 7.3.1, in nixpkgs unstable

💖 nfp_cpp_area_read(9) — like, the kernel API manual bestie 💖

okay so this is nfp_cpp_area_read, and yes it lives in the Kernel API Manual section 9 (the kernel-functions girlies ✨). she's a little function with one job and she does it beautifully. let's get into it 🫶

✨ NAME ✨

nfp_cpp_area_read — read data from CPP area. that's it. that's the whole vibe. 💅

🌸 SYNOPSIS 🌸

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

look at her. four params, returns an int, iconic behavior only 👑

🎀 ARGUMENTS 🎀

  • area — the CPP area handle. your main character struct, the one you're reading out of 💖
  • offset — offset into the CPP area. like, where in the area you wanna be. lowkey important 🦋
  • kernel_vaddr — kernel address to put data into. this is the destination, the little home the bytes move into 🏠✨
  • length — number of bytes to read. how much you're grabbing. no cap 📏

🦋 DESCRIPTION 🦋

Read data from indicated CPP region. she reads, you receive, everyone slays. that's the whole thing bestie, it's giving "simple, effective, no notes" 💅✨

👑 NOTE 👑

⚠️ okay this part MATTERS so listen up: offset and length must be 32-bit aligned values. not kinda aligned. not "close enough" aligned. 32-bit aligned. and the Area must have been locked down with an 'acquire' — like you gotta acquire first, fr fr, or nothing works 🔒😭

🔥 RETURN 🔥

length of io, or -ERRNO — so she either tells you how much she did, or she hands you a negative errno and you go "💀 okay noted"

🌈 SEE ALSO 🌈

the whole friend group, honestly, it's a big group chat:

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

go say hi to all of them, they're literally all in the same file family 💜

and that's the tea ☕ — source is ./drivers/net/ethernet/netrono..., dated October 2026, and she's still nfp_cpp_area_read(9) to the end 🎀 byeeee bestie, go read some CPP area data, iykyk 💖✨🦋

📦 where this page comes from