mt76: mt7915: add txfree event v3

Update txfree v3 format.
This is an intermediate patch to add mt7916 support.

Co-developed-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
Co-developed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Bo Jiao <Bo.Jiao@mediatek.com>
Reviewed-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -1387,8 +1387,10 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
 	LIST_HEAD(free_list);
 	struct sk_buff *skb, *tmp;
 	void *end = data + len;
-	u8 i, count;
-	bool wake = false;
+	bool v3, wake = false;
+	u16 total, count = 0;
+	u32 txd = le32_to_cpu(free->txd);
+	u32 *cur_info;
 
 	/* clean DMA queues and unmap buffers first */
 	mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_PSD], false);
@@ -1403,12 +1405,14 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
 	 * to the time ack is received or dropped by hw (air + hw queue time).
 	 * Should avoid accessing WTBL to get Tx airtime, and use it instead.
 	 */
-	count = FIELD_GET(MT_TX_FREE_MSDU_CNT, le16_to_cpu(free->ctrl));
-	if (WARN_ON_ONCE((void *)&free->info[count] > end))
+	total = FIELD_GET(MT_TX_FREE_MSDU_CNT, le16_to_cpu(free->ctrl));
+	v3 = (FIELD_GET(MT_TX_FREE_VER, txd) == 0x4);
+	if (WARN_ON_ONCE((void *)&free->info[total >> v3] > end))
 		return;
 
-	for (i = 0; i < count; i++) {
-		u32 msdu, info = le32_to_cpu(free->info[i]);
+	for (cur_info = &free->info[0]; count < total; cur_info++) {
+		u32 msdu, info = le32_to_cpu(*cur_info);
+		u8 i;
 
 		/*
 		 * 1'b1: new wcid pair.
@@ -1419,7 +1423,6 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
 			struct mt76_wcid *wcid;
 			u16 idx;
 
-			count++;
 			idx = FIELD_GET(MT_TX_FREE_WLAN_ID, info);
 			wcid = rcu_dereference(dev->mt76.wcid[idx]);
 			sta = wcid_to_sta(wcid);
@@ -1434,12 +1437,24 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
 			continue;
 		}
 
-		msdu = FIELD_GET(MT_TX_FREE_MSDU_ID, info);
-		txwi = mt76_token_release(mdev, msdu, &wake);
-		if (!txwi)
+		if (v3 && (info & MT_TX_FREE_MPDU_HEADER))
 			continue;
 
-		mt7915_txwi_free(dev, txwi, sta, &free_list);
+		for (i = 0; i < 1 + v3; i++) {
+			if (v3) {
+				msdu = (info >> (15 * i)) & MT_TX_FREE_MSDU_ID_V3;
+				if (msdu == MT_TX_FREE_MSDU_ID_V3)
+					continue;
+			} else {
+				msdu = FIELD_GET(MT_TX_FREE_MSDU_ID, info);
+			}
+			count++;
+			txwi = mt76_token_release(mdev, msdu, &wake);
+			if (!txwi)
+				continue;
+
+			mt7915_txwi_free(dev, txwi, sta, &free_list);
+		}
 	}
 
 	mt7915_mac_sta_poll(dev);

drivers/net/wireless/mediatek/mt76/mt7915/mac.h

@@ -298,18 +298,20 @@ struct mt7915_txp {
 struct mt7915_tx_free {
 	__le16 rx_byte_cnt;
 	__le16 ctrl;
-	u8 txd_cnt;
-	u8 rsv[3];
+	__le32 txd;
 	__le32 info[];
 } __packed __aligned(4);
 
+#define MT_TX_FREE_VER			GENMASK(18, 16)
 #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)
 /* 0: success, others: dropped */
-#define MT_TX_FREE_STATUS		GENMASK(14, 13)
 #define MT_TX_FREE_MSDU_ID		GENMASK(30, 16)
 #define MT_TX_FREE_PAIR			BIT(31)
+#define MT_TX_FREE_MPDU_HEADER		BIT(30)
+#define MT_TX_FREE_MSDU_ID_V3		GENMASK(14, 0)
+
 /* will support this field in further revision */
 #define MT_TX_FREE_RATE			GENMASK(13, 0)