mt76: mt7603: track tx airtime for airtime fairness and survey

Poll per-station hardware counters after tx status events
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mac80211.c

@@ -481,6 +481,7 @@ int mt76_get_survey(struct ieee80211_hw *hw, int idx,
 	memset(survey, 0, sizeof(*survey));
 	survey->channel = chan;
 	survey->filled = SURVEY_INFO_TIME | SURVEY_INFO_TIME_BUSY;
+	survey->filled |= dev->drv->survey_flags;
 	if (chan == dev->main_chan) {
 		survey->filled |= SURVEY_INFO_IN_USE;
 
@@ -492,6 +493,7 @@ int mt76_get_survey(struct ieee80211_hw *hw, int idx,
 	survey->time = div_u64(state->cc_active, 1000);
 	survey->time_busy = div_u64(state->cc_busy, 1000);
 	survey->time_bss_rx = div_u64(state->cc_bss_rx, 1000);
+	survey->time_tx = div_u64(state->cc_tx, 1000);
 	spin_unlock_bh(&dev->cc_lock);
 
 	return ret;

drivers/net/wireless/mediatek/mt76/mt76.h

@@ -286,6 +286,7 @@ struct mt76_hw_cap {
 
 struct mt76_driver_ops {
 	u32 drv_flags;
+	u32 survey_flags;
 	u16 txwi_size;
 
 	void (*update_survey)(struct mt76_dev *dev);
@@ -322,6 +323,7 @@ struct mt76_channel_state {
 	u64 cc_active;
 	u64 cc_busy;
 	u64 cc_bss_rx;
+	u64 cc_tx;
 };
 
 struct mt76_sband {

drivers/net/wireless/mediatek/mt76/mt7603/dma.c

@@ -152,6 +152,8 @@ static int mt7603_poll_tx(struct napi_struct *napi, int budget)
 	for (i = MT_TXQ_MCU; i >= 0; i--)
 		mt76_queue_tx_cleanup(dev, i, false);
 
+	mt7603_mac_sta_poll(dev);
+
 	tasklet_schedule(&dev->mt76.tx_tasklet);
 
 	return 0;

drivers/net/wireless/mediatek/mt76/mt7603/init.c

@@ -8,6 +8,7 @@
 const struct mt76_driver_ops mt7603_drv_ops = {
 	.txwi_size = MT_TXD_SIZE,
 	.drv_flags = MT_DRV_SW_RX_AIRTIME,
+	.survey_flags = SURVEY_INFO_TIME_TX,
 	.tx_prepare_skb = mt7603_tx_prepare_skb,
 	.tx_complete_skb = mt7603_tx_complete_skb,
 	.rx_skb = mt7603_queue_rx_skb,
@@ -525,6 +526,8 @@ int mt7603_register_device(struct mt7603_dev *dev)
 	bus_ops->rmw = mt7603_rmw;
 	dev->mt76.bus = bus_ops;
 
+	INIT_LIST_HEAD(&dev->sta_poll_list);
+	spin_lock_init(&dev->sta_poll_lock);
 	spin_lock_init(&dev->ps_lock);
 
 	INIT_DELAYED_WORK(&dev->mt76.mac_work, mt7603_mac_work);

drivers/net/wireless/mediatek/mt76/mt7603/mac.c

@@ -160,6 +160,8 @@ void mt7603_wtbl_init(struct mt7603_dev *dev, int idx, int vif,
 	addr = mt7603_wtbl4_addr(idx);
 	for (i = 0; i < MT_WTBL4_SIZE; i += 4)
 		mt76_wr(dev, addr + i, 0);
+
+	mt7603_wtbl_update(dev, idx, MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 }
 
 static void
@@ -380,6 +382,84 @@ void mt7603_mac_tx_ba_reset(struct mt7603_dev *dev, int wcid, int tid,
 	mt76_rmw(dev, addr + (15 * 4), tid_mask, tid_val);
 }
 
+void mt7603_mac_sta_poll(struct mt7603_dev *dev)
+{
+	static const u8 ac_to_tid[4] = {
+		[IEEE80211_AC_BE] = 0,
+		[IEEE80211_AC_BK] = 1,
+		[IEEE80211_AC_VI] = 4,
+		[IEEE80211_AC_VO] = 6
+	};
+	struct ieee80211_sta *sta;
+	struct mt7603_sta *msta;
+	u32 total_airtime = 0;
+	u32 airtime[4];
+	u32 addr;
+	int i;
+
+	rcu_read_lock();
+
+	while (1) {
+		bool clear = false;
+
+		spin_lock_bh(&dev->sta_poll_lock);
+		if (list_empty(&dev->sta_poll_list)) {
+			spin_unlock_bh(&dev->sta_poll_lock);
+			break;
+		}
+
+		msta = list_first_entry(&dev->sta_poll_list, struct mt7603_sta,
+					poll_list);
+		list_del_init(&msta->poll_list);
+		spin_unlock_bh(&dev->sta_poll_lock);
+
+		addr = mt7603_wtbl4_addr(msta->wcid.idx);
+		for (i = 0; i < 4; i++) {
+			u32 airtime_last = msta->tx_airtime_ac[i];
+
+			msta->tx_airtime_ac[i] = mt76_rr(dev, addr + i * 8);
+			airtime[i] = msta->tx_airtime_ac[i] - airtime_last;
+			airtime[i] *= 32;
+			total_airtime += airtime[i];
+
+			if (msta->tx_airtime_ac[i] & BIT(22))
+				clear = true;
+		}
+
+		if (clear) {
+			mt7603_wtbl_update(dev, msta->wcid.idx,
+					   MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
+			memset(msta->tx_airtime_ac, 0,
+			       sizeof(msta->tx_airtime_ac));
+		}
+
+		if (!msta->wcid.sta)
+			continue;
+
+		sta = container_of((void *)msta, struct ieee80211_sta, drv_priv);
+		for (i = 0; i < 4; i++) {
+			struct mt76_queue *q = dev->mt76.q_tx[i].q;
+			u8 qidx = q->hw_idx;
+			u8 tid = ac_to_tid[i];
+			u32 txtime = airtime[qidx];
+
+			if (!txtime)
+				continue;
+
+			ieee80211_sta_register_airtime(sta, tid, txtime, 0);
+		}
+	}
+
+	rcu_read_unlock();
+
+	if (!total_airtime)
+		return;
+
+	spin_lock_bh(&dev->mt76.cc_lock);
+	dev->mt76.chan_state->cc_tx += total_airtime;
+	spin_unlock_bh(&dev->mt76.cc_lock);
+}
+
 static struct mt76_wcid *
 mt7603_rx_get_wcid(struct mt7603_dev *dev, u8 idx, bool unicast)
 {
@@ -1159,6 +1239,12 @@ void mt7603_mac_add_txs(struct mt7603_dev *dev, void *data)
 	msta = container_of(wcid, struct mt7603_sta, wcid);
 	sta = wcid_to_sta(wcid);
 
+	if (list_empty(&msta->poll_list)) {
+		spin_lock_bh(&dev->sta_poll_lock);
+		list_add_tail(&msta->poll_list, &dev->sta_poll_list);
+		spin_unlock_bh(&dev->sta_poll_lock);
+	}
+
 	if (mt7603_mac_add_txs_skb(dev, msta, pid, txs_data))
 		goto out;
 

drivers/net/wireless/mediatek/mt76/mt7603/main.c

@@ -66,6 +66,7 @@ mt7603_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 
 	idx = MT7603_WTBL_RESERVED - 1 - mvif->idx;
 	dev->vif_mask |= BIT(mvif->idx);
+	INIT_LIST_HEAD(&mvif->sta.poll_list);
 	mvif->sta.wcid.idx = idx;
 	mvif->sta.wcid.hw_key_idx = -1;
 
@@ -87,8 +88,9 @@ static void
 mt7603_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
 	struct mt7603_vif *mvif = (struct mt7603_vif *)vif->drv_priv;
+	struct mt7603_sta *msta = &mvif->sta;
 	struct mt7603_dev *dev = hw->priv;
-	int idx = mvif->sta.wcid.idx;
+	int idx = msta->wcid.idx;
 
 	mt76_wr(dev, MT_MAC_ADDR0(mvif->idx), 0);
 	mt76_wr(dev, MT_MAC_ADDR1(mvif->idx), 0);
@@ -99,6 +101,11 @@ mt7603_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	rcu_assign_pointer(dev->mt76.wcid[idx], NULL);
 	mt76_txq_remove(&dev->mt76, vif->txq);
 
+	spin_lock_bh(&dev->sta_poll_lock);
+	if (!list_empty(&msta->poll_list))
+		list_del_init(&msta->poll_list);
+	spin_unlock_bh(&dev->sta_poll_lock);
+
 	mutex_lock(&dev->mt76.mutex);
 	dev->vif_mask &= ~BIT(mvif->idx);
 	mutex_unlock(&dev->mt76.mutex);
@@ -325,6 +332,7 @@ mt7603_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 	if (idx < 0)
 		return -ENOSPC;
 
+	INIT_LIST_HEAD(&msta->poll_list);
 	__skb_queue_head_init(&msta->psq);
 	msta->ps = ~0;
 	msta->smps = ~0;
@@ -361,6 +369,11 @@ mt7603_sta_remove(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 	mt7603_filter_tx(dev, wcid->idx, true);
 	spin_unlock_bh(&dev->ps_lock);
 
+	spin_lock_bh(&dev->sta_poll_lock);
+	if (!list_empty(&msta->poll_list))
+		list_del_init(&msta->poll_list);
+	spin_unlock_bh(&dev->sta_poll_lock);
+
 	mt7603_wtbl_clear(dev, wcid->idx);
 }
 

drivers/net/wireless/mediatek/mt76/mt7603/mt7603.h

@@ -61,6 +61,9 @@ struct mt7603_sta {
 
 	struct mt7603_vif *vif;
 
+	struct list_head poll_list;
+	u32 tx_airtime_ac[4];
+
 	struct sk_buff_head psq;
 
 	struct ieee80211_tx_rate rates[4];
@@ -103,6 +106,9 @@ struct mt7603_dev {
 
 	u8 vif_mask;
 
+	struct list_head sta_poll_list;
+	spinlock_t sta_poll_lock;
+
 	struct mt7603_sta global_sta;
 
 	u32 agc0, agc3;
@@ -202,6 +208,7 @@ void mt7603_mac_add_txs(struct mt7603_dev *dev, void *data);
 void mt7603_mac_rx_ba_reset(struct mt7603_dev *dev, void *addr, u8 tid);
 void mt7603_mac_tx_ba_reset(struct mt7603_dev *dev, int wcid, int tid,
 			    int ba_size);
+void mt7603_mac_sta_poll(struct mt7603_dev *dev);
 
 void mt7603_pse_client_reset(struct mt7603_dev *dev);