Revert "wifi: mt76: mt7996: fill txd by host driver"

This reverts commit 3b522ca.

The MTK connac3 has introduced new hardware, SDO (Software Defined
Offload), to offload the process of filling the TX descriptor. Initially,
there were some issues, but after several fixes, it should now be stable,
allowing us to revert this commit.

Additionally, activating SDO is essential for the proper functioning of
features like TX checksum offload.

Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Link: https://patch.msgid.link/20250328022847.1612082-1-shayne.chen@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>

Author: csyuanc

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

@@ -1040,8 +1040,11 @@ int mt7996_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 		return id;
 
 	pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
-	mt7996_mac_write_txwi(dev, txwi_ptr, tx_info->skb, wcid, key,
-			      pid, qid, 0);
+	memset(txwi_ptr, 0, MT_TXD_SIZE);
+	/* Transmit non qos data by 802.11 header and need to fill txd by host*/
+	if (!is_8023 || pid >= MT_PACKET_ID_FIRST)
+		mt7996_mac_write_txwi(dev, txwi_ptr, tx_info->skb, wcid, key,
+				      pid, qid, 0);
 
 	txp = (struct mt76_connac_txp_common *)(txwi + MT_TXD_SIZE);
 	for (i = 0; i < nbuf; i++) {
@@ -1058,8 +1061,10 @@ int mt7996_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	}
 	txp->fw.nbuf = nbuf;
 
-	txp->fw.flags =
-		cpu_to_le16(MT_CT_INFO_FROM_HOST | MT_CT_INFO_APPLY_TXD);
+	txp->fw.flags = cpu_to_le16(MT_CT_INFO_FROM_HOST);
+
+	if (!is_8023 || pid >= MT_PACKET_ID_FIRST)
+		txp->fw.flags |= cpu_to_le16(MT_CT_INFO_APPLY_TXD);
 
 	if (!key)
 		txp->fw.flags |= cpu_to_le16(MT_CT_INFO_NONE_CIPHER_FRAME);