io_uring_register_napi(3)

✨ io_uring_register_napi ✨

okay bestie, gather round, because we're talking about the liburing manual page for io_uring_register_napi(3) and honestly? it's giving network-nerd excellence 🦋

🌸 NAME 🌸

io_uring_register_napi — register NAPI busy poll settings 💅

🎀 SYNOPSIS 🎀

#include <liburing.h>

int io_uring_register_napi(struct io_uring *ring,
                           struct io_uring_napi *napi)

💖 DESCRIPTION 💖

so io_uring_register_napi(3) registers the NAPI settings for all the operations that come after it. like, it's setting the vibe for everything downstream, no cap. ✨

the NAPI settings themselves live in the struct you hand over in the napi parameter, and that struct is made of:

• the napi timeout busy_poll_to — that's the napi busy poll timeout, measured in us
• and prefer_busy_poll

registering NAPI settings sets the mode that gets used when you call the function napi_busy_loop, and lowkey it corresponds to the SO_PREFER_BUSY_POLL socket option. iykyk 🔥

and the whole point? NAPI busy poll can reduce the network roundtrip time. literally faster roundtrips, we love to see it 👑

⭐ RETURN VALUE ⭐

• on success, io_uring_register_napi(3) returns 0 🫶
• on failure, it returns -errno 😭
• and heads up — it also updates the napi structure with the current values, so that struct isn't staying the way you left it bestie, it's coming back with receipts 📝

reminder that this one both registers and updates, so don't be shocked when your napi struct changes on you 💀

and that's the whole page, periodt 💅 this was the liburing-2.4 version of the manual, dated November 16, 2022 — mwah, go reduce some roundtrip times bestie 🧚💜