i40e_realloc_rx_bi_zc(9)

💅 i40e_realloc_rx_bi_zc — like, the kernel API manual page, bestie ✨

okay so real talk, this whole page lives in section 9 — the Kernel API Manual — and it's literally all about one function: i40e_realloc_rx_bi_zc. yes the name is a mouthful. no you cannot shorten it. iykyk 🫶

---

🌸 NAME 🌸

i40e_realloc_rx_bi_zc — reallocate rx SW rings 💫

like... it's giving "the rings need more room." that's the whole vibe.

---

✨ SYNOPSIS ✨

int i40e_realloc_rx_bi_zc (struct i40e_vsi *vsi , bool zc );

look at her. two args. returns an int. iconic behavior honestly 👑

---

🎀 ARGUMENTS 🎀

• vsi — Current VSI. yes bestie, the VSI we're working on, the one right in front of you 💜
• zc — is zero copy set. that's it, that's the flag, don't overthink it 🦋

---

🌈 DESCRIPTION 🌈

So here's the tea: this function reallocates the buffer for rx_rings — and those rings might be used by XSK. mmhmm. XSK. get into it.

And why do we care?? because XDP requires more memory than rx_buf provides 😭 like it literally just needs a bigger fit. so we reallocate. slay.

Return value check, because we're responsible queens:

• returns 0 on success 🥳
• returns a negative value on failure 💀

periodt. that's the spec.

no cap, if you get a negative back, something did NOT eat. handle it.

---

🧚 SEE ALSO 🧚

the source file itself, because of course we link the lore:

• Kernel file ./drivers/net/ethernet/intel/i40e/i40e_xsk.c

and the whole friend group, in order, bestie:

• i40e_realloc_rx_xdp_bi(9)
• i40e_xsk_pool_enable(9)
• i40e_xsk_pool_disable(9)
• i40e_xsk_pool_setup(9)
• i40e_run_xdp_zc(9)
• i40e_construct_skb_zc(9)
• i40e_clean_rx_irq_zc(9)
• i40e_xmit_zc(9)
• i40e_clean_xdp_tx_buffer(9)
• i40e_clean_xdp_tx_irq(9)
• i40e_xsk_wakeup(9)
• i40e_xsk_clean_tx_ring(9)
• i40e_xsk_any_rx_ring_enabled(9)

go read them. all of them. it's a whole saga 💅

---

💖 and that's the page!! shoutout to ./drivers/net/ethernet/intel/i40e for housing all this, and to October 2026 for the timestamp — no thoughts, just a very dated but very valid manual entry. bye bestie, go realloc responsibly 🌸🎀✨🫶