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wifi: mac80211: keep recently active tx queues in scheduling list

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This allows proper deficit accounting to ensure that they don't carry their
deficit until the next time they become active

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://lore.kernel.org/r/20220625212411.36675-4-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2022-06-25 23:24:08 +02:00 committed by Johannes Berg
parent 9c1be3cde0
commit 8ccc07028c
3 changed files with 44 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
net/mac80211/ieee80211_i.h
View file

@ -83,6 +83,13 @@ extern const u8 ieee80211_ac_to_qos_mask[IEEE80211_NUM_ACS];
#define IEEE80211_MAX_NAN_INSTANCE_ID 255
/*
* Keep a station's queues on the active list for deficit accounting purposes
* if it was active or queued during the last 100ms
*/
#define AIRTIME_ACTIVE_DURATION (HZ / 10)
struct ieee80211_bss {
u32 device_ts_beacon, device_ts_presp;

1
net/mac80211/sta_info.h
View file

@ -138,6 +138,7 @@ enum ieee80211_agg_stop_reason {
struct airtime_info {
u64 rx_airtime;
u64 tx_airtime;
u32 last_active;
s32 deficit;
atomic_t aql_tx_pending; /* Estimated airtime for frames pending */
u32 aql_limit_low;

40
net/mac80211/tx.c
View file

@ -3807,6 +3807,36 @@ static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac)
return air_info->deficit - atomic_read(&air_info->aql_tx_pending);
}
static void
ieee80211_txq_set_active(struct txq_info *txqi)
{
struct sta_info *sta;
if (!txqi->txq.sta)
return;
sta = container_of(txqi->txq.sta, struct sta_info, sta);
sta->airtime[txqi->txq.ac].last_active = (u32)jiffies;
}
static bool
ieee80211_txq_keep_active(struct txq_info *txqi)
{
struct sta_info *sta;
u32 diff;
if (!txqi->txq.sta)
return false;
sta = container_of(txqi->txq.sta, struct sta_info, sta);
if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0)
return false;
diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active;
return diff <= AIRTIME_ACTIVE_DURATION;
}
struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
{
struct ieee80211_local *local = hw_to_local(hw);
@ -3853,7 +3883,6 @@ struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
}
}
if (txqi->schedule_round == local->schedule_round[ac])
goto out;
@ -3873,12 +3902,13 @@ void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
{
struct ieee80211_local *local = hw_to_local(hw);
struct txq_info *txqi = to_txq_info(txq);
bool has_queue;
spin_lock_bh(&local->active_txq_lock[txq->ac]);
has_queue = force || txq_has_queue(txq);
if (list_empty(&txqi->schedule_order) &&
(force || !skb_queue_empty(&txqi->frags) ||
txqi->tin.backlog_packets)) {
(has_queue || ieee80211_txq_keep_active(txqi))) {
/* If airtime accounting is active, always enqueue STAs at the
* head of the list to ensure that they only get moved to the
* back by the airtime DRR scheduler once they have a negative
@ -3886,7 +3916,7 @@ void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
* get immediately moved to the back of the list on the next
* call to ieee80211_next_txq().
*/
if (txqi->txq.sta && local->airtime_flags &&
if (txqi->txq.sta && local->airtime_flags && has_queue &&
wiphy_ext_feature_isset(local->hw.wiphy,
NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
list_add(&txqi->schedule_order,
@ -3894,6 +3924,8 @@ void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
else
list_add_tail(&txqi->schedule_order,
&local->active_txqs[txq->ac]);
if (has_queue)
ieee80211_txq_set_active(txqi);
}
spin_unlock_bh(&local->active_txq_lock[txq->ac]);