mt76: connac: move mt76_connac_tx_free in shared code

Move mt76_connac_tx_free structure in mt76_connac module since it is
shared by mt7615 and mt7921 drivers.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -1638,7 +1638,8 @@ mt7615_mac_tx_free_token(struct mt7615_dev *dev, u16 token)
 
 static void mt7615_mac_tx_free(struct mt7615_dev *dev, void *data, int len)
 {
-	struct mt7615_tx_free *free = (struct mt7615_tx_free *)data;
+	struct mt76_connac_tx_free *free = data;
+	void *tx_token = data + sizeof(*free);
 	void *end = data + len;
 	u8 i, count;
 
@@ -1652,7 +1653,7 @@ static void mt7615_mac_tx_free(struct mt7615_dev *dev, void *data, int len)
 
 	count = le16_get_bits(free->ctrl, MT_TX_FREE_MSDU_ID_CNT);
 	if (is_mt7615(&dev->mt76)) {
-		__le16 *token = &free->token[0];
+		__le16 *token = tx_token;
 
 		if (WARN_ON_ONCE((void *)&token[count] > end))
 			return;
@@ -1660,7 +1661,7 @@ static void mt7615_mac_tx_free(struct mt7615_dev *dev, void *data, int len)
 		for (i = 0; i < count; i++)
 			mt7615_mac_tx_free_token(dev, le16_to_cpu(token[i]));
 	} else {
-		__le32 *token = (__le32 *)&free->token[0];
+		__le32 *token = tx_token;
 
 		if (WARN_ON_ONCE((void *)&token[count] > end))
 			return;

drivers/net/wireless/mediatek/mt76/mt7615/mac.h

@@ -252,14 +252,6 @@ enum tx_phy_bandwidth {
 /* mt7663 */
 #define MT_TXD_LEN_LAST			BIT(15)
 
-struct mt7615_tx_free {
-	__le16 rx_byte_cnt;
-	__le16 ctrl;
-	u8 txd_cnt;
-	u8 rsv[3];
-	__le16 token[];
-} __packed __aligned(4);
-
 #define MT_TX_FREE_MSDU_ID_CNT		GENMASK(6, 0)
 
 #define MT_TXS0_PID			GENMASK(31, 24)

drivers/net/wireless/mediatek/mt76/mt76_connac.h

@@ -136,6 +136,13 @@ struct mt76_connac_txp_common {
 	};
 };
 
+struct mt76_connac_tx_free {
+	__le16 rx_byte_cnt;
+	__le16 ctrl;
+	u8 txd_cnt;
+	u8 rsv[3];
+} __packed __aligned(4);
+
 extern const struct wiphy_wowlan_support mt76_connac_wowlan_support;
 
 static inline bool is_mt7922(struct mt76_dev *dev)

drivers/net/wireless/mediatek/mt76/mt7921/mac.h

@@ -42,14 +42,6 @@ enum tx_mcu_port_q_idx {
 	MT_TX_MCU_PORT_RX_FWDL = 0x3e
 };
 
-struct mt7921_tx_free {
-	__le16 rx_byte_cnt;
-	__le16 ctrl;
-	u8 txd_cnt;
-	u8 rsv[3];
-	__le32 info[];
-} __packed __aligned(4);
-
 #define MT_TX_FREE_MSDU_CNT		GENMASK(9, 0)
 #define MT_TX_FREE_WLAN_ID		GENMASK(23, 14)
 #define MT_TX_FREE_LATENCY		GENMASK(12, 0)

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

@@ -150,7 +150,8 @@ mt7921_txwi_free(struct mt7921_dev *dev, struct mt76_txwi_cache *t,
 static void
 mt7921e_mac_tx_free(struct mt7921_dev *dev, void *data, int len)
 {
-	struct mt7921_tx_free *free = (struct mt7921_tx_free *)data;
+	struct mt76_connac_tx_free *free = data;
+	__le32 *tx_info = (__le32 *)(data + sizeof(*free));
 	struct mt76_dev *mdev = &dev->mt76;
 	struct mt76_txwi_cache *txwi;
 	struct ieee80211_sta *sta = NULL;
@@ -165,11 +166,11 @@ mt7921e_mac_tx_free(struct mt7921_dev *dev, void *data, int len)
 	mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_BE], false);
 
 	count = le16_get_bits(free->ctrl, MT_TX_FREE_MSDU_CNT);
-	if (WARN_ON_ONCE((void *)&free->info[count] > end))
+	if (WARN_ON_ONCE((void *)&tx_info[count] > end))
 		return;
 
 	for (i = 0; i < count; i++) {
-		u32 msdu, info = le32_to_cpu(free->info[i]);
+		u32 msdu, info = le32_to_cpu(tx_info[i]);
 		u8 stat;
 
 		/* 1'b1: new wcid pair.