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@@ -0,0 +1,30 @@
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+From: Felix Fietkau <[email protected]>
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+Date: Wed, 13 Jul 2022 07:32:26 +0200
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+Subject: [PATCH] mac80211: exclude multicast packets from AQL pending airtime
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+
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+In AP mode, multicast traffic is handled very differently from normal traffic,
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+especially if at least one client is in powersave mode.
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+This means that multicast packets can be buffered a lot longer than normal
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+unicast packets, and can eat up the AQL budget very quickly because of the low
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+data rate.
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+Along with the recent change to maintain a global PHY AQL limit, this can lead
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+to significant latency spikes for unicast traffic.
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+
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+Since queueing multicast to hardware is currently not constrained by AQL limits
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+anyway, let's just exclude it from the AQL pending airtime calculation entirely.
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+
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+Fixes: 8e4bac067105 ("wifi: mac80211: add a per-PHY AQL limit to improve fairness")
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+Signed-off-by: Felix Fietkau <[email protected]>
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+---
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+
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+--- a/net/mac80211/tx.c
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++++ b/net/mac80211/tx.c
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+@@ -3792,7 +3792,7 @@ begin:
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+ encap_out:
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+ IEEE80211_SKB_CB(skb)->control.vif = vif;
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+
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+- if (vif &&
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++ if (tx.sta &&
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+ wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) {
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+ bool ampdu = txq->ac != IEEE80211_AC_VO;
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+ u32 airtime;
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Felix Fietkau