mt76: introduce packet_id idr

Introduce per-wcid idr to manage packet id for txs. This allow fast idr
lookup and skb queueing at the same time.

Tested-by: mrkiko.rs@gmail.com
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -566,6 +566,8 @@ mt76_alloc_device(struct device *pdev, unsigned int size,
 	spin_lock_init(&dev->token_lock);
 	idr_init(&dev->token);
 
+	INIT_LIST_HEAD(&dev->wcid_list);
+
 	INIT_LIST_HEAD(&dev->txwi_cache);
 
 	for (i = 0; i < ARRAY_SIZE(dev->q_rx); i++)
@@ -1237,6 +1239,7 @@ mt76_sta_add(struct mt76_dev *dev, struct ieee80211_vif *vif,
 	wcid->ext_phy = ext_phy;
 	rcu_assign_pointer(dev->wcid[wcid->idx], wcid);
 
+	mt76_packet_id_init(wcid);
 out:
 	mutex_unlock(&dev->mutex);
 
@@ -1255,7 +1258,8 @@ void __mt76_sta_remove(struct mt76_dev *dev, struct ieee80211_vif *vif,
 	if (dev->drv->sta_remove)
 		dev->drv->sta_remove(dev, vif, sta);
 
-	mt76_tx_status_check(dev, wcid, true);
+	mt76_packet_id_flush(dev, wcid);
+
 	mt76_wcid_mask_clear(dev->wcid_mask, idx);
 	mt76_wcid_mask_clear(dev->wcid_phy_mask, idx);
 }

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

@@ -261,7 +261,8 @@ struct mt76_wcid {
 	u32 tx_info;
 	bool sw_iv;
 
-	u8 packet_id;
+	struct list_head list;
+	struct idr pktid;
 };
 
 struct mt76_txq {
@@ -701,6 +702,7 @@ struct mt76_dev {
 
 	struct mt76_wcid global_wcid;
 	struct mt76_wcid __rcu *wcid[MT76_N_WCIDS];
+	struct list_head wcid_list;
 
 	u32 rev;
 
@@ -1311,14 +1313,22 @@ mt76_token_put(struct mt76_dev *dev, int token)
 	return txwi;
 }
 
-static inline int
-mt76_get_next_pkt_id(struct mt76_wcid *wcid)
+static inline void mt76_packet_id_init(struct mt76_wcid *wcid)
+{
+	INIT_LIST_HEAD(&wcid->list);
+	idr_init(&wcid->pktid);
+}
+
+static inline void
+mt76_packet_id_flush(struct mt76_dev *dev, struct mt76_wcid *wcid)
 {
-	wcid->packet_id = (wcid->packet_id + 1) & MT_PACKET_ID_MASK;
-	if (wcid->packet_id == MT_PACKET_ID_NO_ACK ||
-	    wcid->packet_id == MT_PACKET_ID_NO_SKB)
-		wcid->packet_id = MT_PACKET_ID_FIRST;
+	struct sk_buff_head list;
 
-	return wcid->packet_id;
+	mt76_tx_status_lock(dev, &list);
+	mt76_tx_status_skb_get(dev, wcid, -1, &list);
+	mt76_tx_status_unlock(dev, &list);
+
+	idr_destroy(&wcid->pktid);
 }
+
 #endif

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

@@ -69,6 +69,7 @@ mt7603_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	INIT_LIST_HEAD(&mvif->sta.poll_list);
 	mvif->sta.wcid.idx = idx;
 	mvif->sta.wcid.hw_key_idx = -1;
+	mt76_packet_id_init(&mvif->sta.wcid);
 
 	eth_broadcast_addr(bc_addr);
 	mt7603_wtbl_init(dev, idx, mvif->idx, bc_addr);
@@ -107,6 +108,8 @@ mt7603_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	mutex_lock(&dev->mt76.mutex);
 	dev->mt76.vif_mask &= ~BIT(mvif->idx);
 	mutex_unlock(&dev->mt76.mutex);
+
+	mt76_packet_id_flush(&dev->mt76, &mvif->sta.wcid);
 }
 
 void mt7603_init_edcca(struct mt7603_dev *dev)

drivers/net/wireless/mediatek/mt76/mt7615/main.c

@@ -231,6 +231,8 @@ static int mt7615_add_interface(struct ieee80211_hw *hw,
 	mvif->sta.wcid.idx = idx;
 	mvif->sta.wcid.ext_phy = mvif->mt76.band_idx;
 	mvif->sta.wcid.hw_key_idx = -1;
+	mt76_packet_id_init(&mvif->sta.wcid);
+
 	mt7615_mac_wtbl_update(dev, idx,
 			       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 
@@ -281,6 +283,8 @@ static void mt7615_remove_interface(struct ieee80211_hw *hw,
 	if (!list_empty(&msta->poll_list))
 		list_del_init(&msta->poll_list);
 	spin_unlock_bh(&dev->sta_poll_lock);
+
+	mt76_packet_id_flush(&dev->mt76, &mvif->sta.wcid);
 }
 
 static void mt7615_init_dfs_state(struct mt7615_phy *phy)

drivers/net/wireless/mediatek/mt76/mt76x02_util.c

@@ -287,6 +287,8 @@ mt76x02_vif_init(struct mt76x02_dev *dev, struct ieee80211_vif *vif,
 	mvif->idx = idx;
 	mvif->group_wcid.idx = MT_VIF_WCID(idx);
 	mvif->group_wcid.hw_key_idx = -1;
+	mt76_packet_id_init(&mvif->group_wcid);
+
 	mtxq = (struct mt76_txq *)vif->txq->drv_priv;
 	mtxq->wcid = &mvif->group_wcid;
 }
@@ -341,6 +343,7 @@ void mt76x02_remove_interface(struct ieee80211_hw *hw,
 	struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
 
 	dev->mt76.vif_mask &= ~BIT(mvif->idx);
+	mt76_packet_id_flush(&dev->mt76, &mvif->group_wcid);
 }
 EXPORT_SYMBOL_GPL(mt76x02_remove_interface);
 

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -236,6 +236,8 @@ static int mt7915_add_interface(struct ieee80211_hw *hw,
 	mvif->sta.wcid.ext_phy = mvif->band_idx;
 	mvif->sta.wcid.hw_key_idx = -1;
 	mvif->sta.wcid.tx_info |= MT_WCID_TX_INFO_SET;
+	mt76_packet_id_init(&mvif->sta.wcid);
+
 	mt7915_mac_wtbl_update(dev, idx,
 			       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 
@@ -290,6 +292,8 @@ static void mt7915_remove_interface(struct ieee80211_hw *hw,
 	if (!list_empty(&msta->poll_list))
 		list_del_init(&msta->poll_list);
 	spin_unlock_bh(&dev->sta_poll_lock);
+
+	mt76_packet_id_flush(&dev->mt76, &msta->wcid);
 }
 
 static void mt7915_init_dfs_state(struct mt7915_phy *phy)

drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -304,6 +304,8 @@ static int mt7921_add_interface(struct ieee80211_hw *hw,
 	mvif->sta.wcid.ext_phy = mvif->mt76.band_idx;
 	mvif->sta.wcid.hw_key_idx = -1;
 	mvif->sta.wcid.tx_info |= MT_WCID_TX_INFO_SET;
+	mt76_packet_id_init(&mvif->sta.wcid);
+
 	mt7921_mac_wtbl_update(dev, idx,
 			       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 
@@ -350,6 +352,8 @@ static void mt7921_remove_interface(struct ieee80211_hw *hw,
 	if (!list_empty(&msta->poll_list))
 		list_del_init(&msta->poll_list);
 	spin_unlock_bh(&dev->sta_poll_lock);
+
+	mt76_packet_id_flush(&dev->mt76, &msta->wcid);
 }
 
 static int mt7921_set_channel(struct mt7921_phy *phy)

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

@@ -92,8 +92,6 @@ __mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb, u8 flags,
 	if ((flags & done) != done)
 		return;
 
-	__skb_unlink(skb, &dev->status_list);
-
 	/* Tx status can be unreliable. if it fails, mark the frame as ACKed */
 	if (flags & MT_TX_CB_TXS_FAILED) {
 		info->status.rates[0].count = 0;
@@ -120,6 +118,8 @@ mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid,
 	struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
 	int pid;
 
+	memset(cb, 0, sizeof(*cb));
+
 	if (!wcid)
 		return MT_PACKET_ID_NO_ACK;
 
@@ -132,13 +132,21 @@ mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid,
 
 	spin_lock_bh(&dev->status_list.lock);
 
-	memset(cb, 0, sizeof(*cb));
-	pid = mt76_get_next_pkt_id(wcid);
+	pid = idr_alloc(&wcid->pktid, skb, MT_PACKET_ID_FIRST,
+			MT_PACKET_ID_MASK, GFP_ATOMIC);
+	if (pid < 0) {
+		pid = MT_PACKET_ID_NO_SKB;
+		goto out;
+	}
+
 	cb->wcid = wcid->idx;
 	cb->pktid = pid;
 	cb->jiffies = jiffies;
 
-	__skb_queue_tail(&dev->status_list, skb);
+	if (list_empty(&wcid->list))
+		list_add_tail(&wcid->list, &dev->wcid_list);
+
+out:
 	spin_unlock_bh(&dev->status_list.lock);
 
 	return pid;
@@ -149,26 +157,38 @@ struct sk_buff *
 mt76_tx_status_skb_get(struct mt76_dev *dev, struct mt76_wcid *wcid, int pktid,
 		       struct sk_buff_head *list)
 {
-	struct sk_buff *skb, *tmp;
+	struct sk_buff *skb;
+	int id;
+
+	lockdep_assert_held(&dev->status_list.lock);
 
-	skb_queue_walk_safe(&dev->status_list, skb, tmp) {
+	skb = idr_remove(&wcid->pktid, pktid);
+	if (skb)
+		goto out;
+
+	/* look for stale entries in the wcid idr queue */
+	idr_for_each_entry(&wcid->pktid, skb, id) {
 		struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
 
-		if (wcid && cb->wcid != wcid->idx)
+		if (pktid >= 0) {
+			if (!(cb->flags & MT_TX_CB_DMA_DONE))
 				continue;
 
-		if (cb->pktid == pktid)
-			return skb;
-
-		if (pktid >= 0 && !time_after(jiffies, cb->jiffies +
+			if (!time_is_after_jiffies(cb->jiffies +
 						   MT_TX_STATUS_SKB_TIMEOUT))
 				continue;
+		}
 
+		idr_remove(&wcid->pktid, cb->pktid);
 		__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_TXS_FAILED |
 						    MT_TX_CB_TXS_DONE, list);
 	}
 
-	return NULL;
+out:
+	if (idr_is_empty(&wcid->pktid))
+		list_del_init(&wcid->list);
+
+	return skb;
 }
 EXPORT_SYMBOL_GPL(mt76_tx_status_skb_get);
 
@@ -176,8 +196,10 @@ void
 mt76_tx_status_check(struct mt76_dev *dev, struct mt76_wcid *wcid, bool flush)
 {
 	struct sk_buff_head list;
+	struct mt76_wcid *tmp;
 
 	mt76_tx_status_lock(dev, &list);
+	list_for_each_entry_safe(wcid, tmp, &dev->wcid_list, list)
 		mt76_tx_status_skb_get(dev, wcid, flush ? -1 : 0, &list);
 	mt76_tx_status_unlock(dev, &list);
 }
@@ -201,6 +223,7 @@ mt76_tx_check_non_aql(struct mt76_dev *dev, struct mt76_wcid *wcid,
 void __mt76_tx_complete_skb(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *skb,
 			    struct list_head *free_list)
 {
+	struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
 	struct ieee80211_tx_status status = {
 		.skb = skb,
 		.free_list = free_list,
@@ -230,7 +253,7 @@ void __mt76_tx_complete_skb(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *
 	}
 #endif
 
-	if (!skb->prev) {
+	if (cb->pktid < MT_PACKET_ID_FIRST) {
 		hw = mt76_tx_status_get_hw(dev, skb);
 		status.sta = wcid_to_sta(wcid);
 		ieee80211_tx_status_ext(hw, &status);