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wifi: mac80211: only accumulate airtime deficit for active clients

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When a client does not generate any local tx activity, accumulating airtime
deficit for the round-robin scheduler can be harmful. If this goes on for too
long, the deficit could grow quite large, which might cause unreasonable
initial latency once the client becomes active

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://lore.kernel.org/r/20220625212411.36675-7-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau
2022-06-25 23:24:11 +02:00
committed by Johannes Berg
parent 3db2c5604f
commit c77bfab923
1 changed files with 6 additions and 1 deletions
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7
net/mac80211/sta_info.c
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@ -2046,6 +2046,7 @@ void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid,
struct ieee80211_local *local = sta->sdata->local;
u8 ac = ieee80211_ac_from_tid(tid);
u32 airtime = 0;
u32 diff;
if (sta->local->airtime_flags & AIRTIME_USE_TX)
airtime += tx_airtime;
@ -2055,7 +2056,11 @@ void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid,
spin_lock_bh(&local->active_txq_lock[ac]);
sta->airtime[ac].tx_airtime += tx_airtime;
sta->airtime[ac].rx_airtime += rx_airtime;
sta->airtime[ac].deficit -= airtime;
diff = (u32)jiffies - sta->airtime[ac].last_active;
if (diff <= AIRTIME_ACTIVE_DURATION)
sta->airtime[ac].deficit -= airtime;
spin_unlock_bh(&local->active_txq_lock[ac]);
}
EXPORT_SYMBOL(ieee80211_sta_register_airtime);