wifi: mt76: mt7996: fix definition of tx descriptor

For mt7992 chipsets, the definition of TXD.DW6.BIT10~15 has different
interpretations on different frame types. Driver only needs to fill
MSDU_CNT for non-management frames.

Fixes: 408566d ("wifi: mt76: connac: add new definition of tx descriptor")
Co-developed-by: Shayne Chen <[email protected]>
Signed-off-by: Shayne Chen <[email protected]>
Signed-off-by: Benjamin Lin <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>

Author: Benjamin Lin

drivers/net/wireless/mediatek/mt76/mt7996/mac.c

@@ -826,6 +826,7 @@ void mt7996_mac_write_txwi(struct mt7996_dev *dev, __le32 *txwi,
 			   struct ieee80211_key_conf *key, int pid,
 			   enum mt76_txq_id qid, u32 changed)
 {
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	struct ieee80211_vif *vif = info->control.vif;
 	u8 band_idx = (info->hw_queue & MT_TX_HW_QUEUE_PHY) >> 2;
@@ -893,8 +894,9 @@ void mt7996_mac_write_txwi(struct mt7996_dev *dev, __le32 *txwi,
 	val = MT_TXD6_DIS_MAT | MT_TXD6_DAS;
 	if (is_mt7996(&dev->mt76))
 		val |= FIELD_PREP(MT_TXD6_MSDU_CNT, 1);
-	else
+	else if (is_8023 || !ieee80211_is_mgmt(hdr->frame_control))
 		val |= FIELD_PREP(MT_TXD6_MSDU_CNT_V2, 1);
+
 	txwi[6] = cpu_to_le32(val);
 	txwi[7] = 0;
 
@@ -904,7 +906,6 @@ void mt7996_mac_write_txwi(struct mt7996_dev *dev, __le32 *txwi,
 		mt7996_mac_write_txwi_80211(dev, txwi, skb, key);
 
 	if (txwi[1] & cpu_to_le32(MT_TXD1_FIXED_RATE)) {
-		struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 		bool mcast = ieee80211_is_data(hdr->frame_control) &&
 			     is_multicast_ether_addr(hdr->addr1);
 		u8 idx = MT7996_BASIC_RATES_TBL;