ef4_filter_remove_id_safe(9)

💅 ef4_filter_remove_id_safe — kernel API manual, section 9 🎀

okay so bestie, welcome to the ef4_filter_remove_id_safe(9) page — yes it's a section 9 kernel API manual, yes it's a whole vibe, and yes I'm gonna walk you through it like we're texting at 2am 💖

---

✨ NAME ✨

ef4_filter_remove_id_safe — remove a filter by ID, carefully 🫶

like, carefully. the careful is the whole point. the careful is the main character.

---

🦋 SYNOPSIS 🦋

int ef4_filter_remove_id_safe (struct ef4_nic *efx , enum
ef4_filter_priority priority , u32 filter_id );

return type is int, she gives you an answer, she's communicative, we love that for her 💅

---

🌸 ARGUMENTS 🌸

• efx — the NIC you're removing the filter from. it's a struct ef4_nic *. this is your girl. this is who you're operating on 🎀
• priority — the priority of the filter, an enum ef4_filter_priority, and it's literally the same one you passed to ef4_filter_insert_filter. match it up, don't be out here guessing ✨
• filter_id — the ID of the filter, a u32, exactly as it was returned by ef4_filter_insert_filter. you gotta get her back from the insert, that's the whole system 🧚

---

🔥 DESCRIPTION 🔥

so what does she actually do? she range-checks filter_id 🕵️‍♀️ like, she verifies it's in bounds before touching anything.

and that is why it is safe to call this function with a value passed from userland. userland! the wild west! the chaotic group chat! but she range-checks, so it's fine, no cap 😌

fr fr the "safe" in the name is not marketing, bestie — the range-check on filter_id is the actual safety mechanism, and that's what makes userland-passed values okay here 💀

---

👑 SEE ALSO 👑

• the kernel file ./drivers/net/ethernet/sfc/falcon/efx.h — go read it, she's right there 🍓
• ef4_filter_insert_filter(9) — where the IDs come from in the first place
• ef4_filter_get_filter_safe(9) — her sibling, also safe, also iconic 🌈

---

and that's the page!! mwah 💜 this lil manual lives in ./drivers/net/ethernet/sfc/falcon and it's dated October 2026 — so go forth, range-check, and slay, periodt ⭐🌸