libeth_xdp_return_buff(9)

📦 version 7.3.1, in nixpkgs unstable

💅 libeth_xdp_return_buff(9) 💅

ok so this is a page from the Kernel API Manual (yes, the Kernel API Manual, we're fancy now ✨) and it's all about one tiny little function that does one tiny little job, and honestly? it ate. let's get into it bestie 🫶

🌸 NAME 🌸

libeth_xdp_return_buff — free/recycle &libeth_xdp_buff

like. that's it. that's the whole gig. it gives your buffer back. iconic behavior 💖

✨ SYNOPSIS ✨

libeth_xdp_return_buff (xdp );

that's the whole call, no cap. one argument, in, out, done 🎀

🦋 ARGUMENTS 🦋

  • xdp — buffer to free. that's the one. hand it over and it gets handled 💅

🔥 DESCRIPTION 🔥

okay so this is a hotpath helper to free libeth_xdp_buff. hotpath, meaning it lives on the fast lane, the main character energy lane, the lane where every nanosecond is a vibe check 👑

comparing to xdp_return_buff, it's faster — and here's the why, bestie:

  • it gets inlined (no function-call overhead, we love a no-overhead queen)
  • it always assumes order-0 pages
  • it always assumes safe direct recycling

so it's basically the speedrun version of the return. no branches, no questions, just vibes and recycling ♻️✨

and lowkey the most important part: zeroes xdp->data to avoid UAFs. that's use-after-free, and we do not do those here. zeroing the pointer is the "delete your ex's number" of kernel programming — you keep yourself safe from future mistakes 💀🙈

ngl this one is built on assumptions — order-0 pages and safe direct recycling are taken as read. it's fast because it doesn't double-check. iykyk 🫶

🌈 SEE ALSO 🌈

okay this list is long long, so buckle up bestie, we're naming every single one because nobody gets left out 🎀

that's the whole squad, every single one accounted for, nobody's getting left on read 💜

✿ and that's the page! ✿ it lives in ./include/net/libeth, dated October 2026, and it goes by libeth_xdp_return_buff(9) — mwah, slay, go free some buffers bestie 💅💖🎀

📦 where this page comes from