filter_ack(9)

💖 filter_ack(9) — like, the whole page 💖

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little kernel-function baddie called filter_ack, and honestly? she's doing the most important job in the wifi group chat: reading the receipts 💅

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🌸 NAME 🌸

filter_ack — filters incoming packets for acknowledgements 🎀

like, she's the one who checks whether somebody actually replied "yes bestie" to your message, no cap.

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✨ SYNOPSIS ✨

int filter_ack (struct ieee80211_hw *hw , struct ieee80211_hdr *rx_hdr ,
struct ieee80211_rx_status *stats );

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🦋 ARGUMENTS 🦋

• hw — a struct ieee80211_hw pointer 🫶 (yes, that kinda pointer, the main character of the hardware world)
• rx_hdr — the received header, aka the envelope of the packet that just showed up 🙈
• stats — the status for the received packet, all the little receipts and metadata about it ⭐

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👑 DESCRIPTION 👑

ok so picture this: packets are coming in, and this function looks for ACK packets and tries to match them with the frames sitting in the tx queue 🔥

if a match is found, the frame gets dequeued, and the upper layers is informed about the successful transmission — like telling the group chat "she replied, we're so back" 🎉

and if mac80211 queues have been stopped and the number of frames still to be transmitted is low, the queues will be opened again 🥳 (unclogging the vibes, we love to see it)

the way that return value matters: she Returns 1 if the frame was an ACK, and 0 if it was ignored 💀 like, one for "yesss that's her", zero for "not my business, moving on"

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/net/wireless/zydas/zd1211rw/zd_mac.c — go read her source bestie, it's giving lore 📖
• zd_mac_tx_status(9)
• zd_mac_tx_failed(9)
• zd_mac_tx_to_dev(9)
• zd_op_tx(9)

the whole zd1211rw friend group honestly, iykyk 💜

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and that's the page!! 💅 mwah, go forth and filter those ack packets 🧚

source/version: ./drivers/net/wireless/zydas/z... — dated October 2026 🍓 periodt, that's the sign-off, love u bye 😭🫶