[PATCH 01/12] wifi: mt76: mt7996: check txs format before getting skb by pid

[Shayne Chen <shayne.chen@mediatek.com>]

From: Peter Chiu <chui-hao.chiu@mediatek.com>

The PPDU TXS does not include the error bit so it cannot use to report
status to mac80211. This patch fixes issue that STA wrongly detects if AP
is still alive.

Fixes: 2569ea5326e2 ("wifi: mt76: mt7996: enable PPDU-TxS to host")
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
---
 .../net/wireless/mediatek/mt76/mt7996/mac.c   | 23 +++++++++++--------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mac.c b/drivers/net/wireless/mediatek/mt76/mt7996/mac.c
index 53258488d49f..a8414fbb07c8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mac.c
@@ -1188,25 +1188,28 @@ mt7996_mac_add_txs_skb(struct mt7996_dev *dev, struct mt76_wcid *wcid,
 	struct ieee80211_tx_info *info;
 	struct sk_buff_head list;
 	struct rate_info rate = {};
-	struct sk_buff *skb;
+	struct sk_buff *skb = NULL;
 	bool cck = false;
 	u32 txrate, txs, mode, stbc;
 
 	txs = le32_to_cpu(txs_data[0]);
 
 	mt76_tx_status_lock(mdev, &list);
-	skb = mt76_tx_status_skb_get(mdev, wcid, pid, &list);
 
-	if (skb) {
-		info = IEEE80211_SKB_CB(skb);
-		if (!(txs & MT_TXS0_ACK_ERROR_MASK))
-			info->flags |= IEEE80211_TX_STAT_ACK;
+	/* only report MPDU TXS */
+	if (le32_get_bits(txs_data[0], MT_TXS0_TXS_FORMAT) == 0) {
+		skb = mt76_tx_status_skb_get(mdev, wcid, pid, &list);
+		if (skb) {
+			info = IEEE80211_SKB_CB(skb);
+			if (!(txs & MT_TXS0_ACK_ERROR_MASK))
+				info->flags |= IEEE80211_TX_STAT_ACK;
 
-		info->status.ampdu_len = 1;
-		info->status.ampdu_ack_len =
-			!!(info->flags & IEEE80211_TX_STAT_ACK);
+			info->status.ampdu_len = 1;
+			info->status.ampdu_ack_len =
+				!!(info->flags & IEEE80211_TX_STAT_ACK);
 
-		info->status.rates[0].idx = -1;
+			info->status.rates[0].idx = -1;
+		}
 	}
 
 	if (mtk_wed_device_active(&dev->mt76.mmio.wed) && wcid->sta) {
-- 
2.39.2