[PATCH 4/4] wifi: mac80211: add ieee80211_txq_aql_pending()

[Felix Fietkau <nbd@nbd.name>]

Add a function to allow drivers to query the pending AQL airtime
for a given txq, for both unicast and broadcast.
This will be used for mt76 to limit buffering in AP mode for power-save
stations.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 include/net/mac80211.h | 11 +++++++++++
 net/mac80211/tx.c      | 18 ++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 310546d4fca6..f260017cc858 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -6710,6 +6710,17 @@ void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid,
 bool
 ieee80211_txq_airtime_check(struct ieee80211_hw *hw, struct ieee80211_txq *txq);
 
+/**
+ * ieee80211_txq_aql_pending - get pending AQL airtime for a txq
+ *
+ * @hw: pointer obtained from ieee80211_alloc_hw()
+ * @txq: pointer obtained from station or virtual interface
+ *
+ * Return: pending airtime (in usec) for the given txq.
+ */
+u32 ieee80211_txq_aql_pending(struct ieee80211_hw *hw,
+			      struct ieee80211_txq *txq);
+
 /**
  * ieee80211_iter_keys - iterate keys programmed into the device
  * @hw: pointer obtained from ieee80211_alloc_hw()
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 04a3ea9beae5..07a65e14d637 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -4185,6 +4185,24 @@ bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
 }
 EXPORT_SYMBOL(ieee80211_txq_airtime_check);
 
+u32 ieee80211_txq_aql_pending(struct ieee80211_hw *hw,
+			      struct ieee80211_txq *txq)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct sta_info *sta;
+
+	if (!txq->sta)
+		return atomic_read(&local->aql_bc_pending_airtime);
+
+	sta = container_of(txq->sta, struct sta_info, sta);
+
+	if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
+		return 0;
+
+	return atomic_read(&sta->airtime[txq->ac].aql_tx_pending);
+}
+EXPORT_SYMBOL(ieee80211_txq_aql_pending);
+
 static bool
 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac)
 {
-- 
2.51.0