i40e_get_ethtool_fdir_entry(9)

📦 version 7.3.1, in nixpkgs unstable

💅 i40e_get_ethtool_fdir_entry — look up a filter based on Rx flow

okay so this is a page from the Kernel API Manual, bestie, and it's about one very specific little function that goes hunting for a filter. let's get into it 🎀

✨ SYNOPSIS ✨

int i40e_get_ethtool_fdir_entry (struct i40e_pf *pf , struct ethtool_rxnfc *cmd );

that's the whole signature, no cap. it takes two pointers and gives you back an int. 🫶

🌸 ARGUMENTS 🌸

  • pf — pointer to the physical function struct. like, the big one. the main character. you're passing in the whole PF here 💜
  • cmd — the command to get or set Rx flow classification rules. this is the little envelope carrying your request 🦋

💖 DESCRIPTION 💖

okay so what does it actually do. this function looks up a filter based on the Rx flow classification command, and if it finds one, it fills in the flow spec info for it. that's it. that's the whole vibe. 🔥

so basically: you hand it a command, it goes searching, and when the filter exists it fills in the flow spec info so you can see what you got. obsessed.

and the return value? tea time 🍓:

  • returns 0 on success 🎉
  • returns -EINVAL if the filter is not found 😭

so if you get -EINVAL back, don't panic — it just means there was no filter matching what you asked for. it's giving "nothing to see here." 💀

🦋 SEE ALSO 🦋

the kernel file this lives in is ./drivers/net/ethernet/intel/i40e/i40e_ethtool.c — that's the home base, iykyk. and here's the whole friend group, literally every single one, in order, not skipping a single bestie 🌈:

like, that is a lot of related functions and honestly? iconic. go read them if you want the full lore 👑

and that's the page!! 💅 huge shoutout to the ./drivers/net/ethernet/intel/i40e directory — that's where all this lives — and this particular manual page is dated October 2026. slay, see you in the next one, bestie 🧚‍♀️⭐

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