wifi: mt76: mt7915: rework tx packets counting when WED is active

PPDU TxS can only report MPDU count whereas mac80211 requires MSDU scale
(NL80211_STA_INFO_TX_PACKETS), so switch to get MSDU counts from WA
statistic.

Note that mt7915 WA firmware only counts tx_packet for WED path, so driver
needs to take care of host path additionally.

Fixes: 43eaa368 ("wifi: mt76: add PPDU based TxS support for WED device")
Co-developed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -277,7 +277,7 @@ struct mt76_sta_stats {
 	u64 tx_mcs[16];		/* mcs idx */
 	u64 tx_bytes;
 	/* WED TX */
-	u32 tx_packets;
+	u32 tx_packets;		/* unit: MSDU */
 	u32 tx_retries;
 	u32 tx_failed;
 	/* WED RX */

drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c

@@ -523,7 +523,9 @@ void mt76_connac2_mac_write_txwi(struct mt76_dev *dev, __le32 *txwi,
 
 		/* counting non-offloading skbs */
 		wcid->stats.tx_bytes += skb->len;
-		wcid->stats.tx_packets++;
+		/* mt7915 WA only counts WED path */
+		if (is_mt7915(dev) && mtk_wed_device_active(&dev->mmio.wed))
+			wcid->stats.tx_packets++;
 	}
 
 	val = FIELD_PREP(MT_TXD0_TX_BYTES, skb->len + sz_txd) |
@@ -606,12 +608,11 @@ bool mt76_connac2_mac_fill_txs(struct mt76_dev *dev, struct mt76_wcid *wcid,
 	txs = le32_to_cpu(txs_data[0]);
 
 	/* PPDU based reporting */
-	if (FIELD_GET(MT_TXS0_TXS_FORMAT, txs) > 1) {
+	if (mtk_wed_device_active(&dev->mmio.wed) &&
+	    FIELD_GET(MT_TXS0_TXS_FORMAT, txs) > 1) {
 		stats->tx_bytes +=
 			le32_get_bits(txs_data[5], MT_TXS5_MPDU_TX_BYTE) -
 			le32_get_bits(txs_data[7], MT_TXS7_MPDU_RETRY_BYTE);
-		stats->tx_packets +=
-			le32_get_bits(txs_data[5], MT_TXS5_MPDU_TX_CNT);
 		stats->tx_failed +=
 			le32_get_bits(txs_data[6], MT_TXS6_MPDU_FAIL_CNT);
 		stats->tx_retries +=

drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h

@@ -998,6 +998,7 @@ enum {
 	MCU_EXT_EVENT_ASSERT_DUMP = 0x23,
 	MCU_EXT_EVENT_RDD_REPORT = 0x3a,
 	MCU_EXT_EVENT_CSA_NOTIFY = 0x4f,
+	MCU_EXT_EVENT_WA_TX_STAT = 0x74,
 	MCU_EXT_EVENT_BCC_NOTIFY = 0x75,
 	MCU_EXT_EVENT_MURU_CTRL = 0x9f,
 };

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

@@ -1042,8 +1042,10 @@ static void mt7915_sta_statistics(struct ieee80211_hw *hw,
 		sinfo->tx_bytes = msta->wcid.stats.tx_bytes;
 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BYTES64);
 
-		sinfo->tx_packets = msta->wcid.stats.tx_packets;
-		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
+		if (!mt7915_mcu_wed_wa_tx_stats(phy->dev, msta->wcid.idx)) {
+			sinfo->tx_packets = msta->wcid.stats.tx_packets;
+			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
+		}
 
 		if (mtk_wed_get_rx_capa(&phy->dev->mt76.mmio.wed)) {
 			sinfo->rx_bytes = msta->wcid.stats.rx_bytes;

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

@@ -164,7 +164,9 @@ mt7915_mcu_parse_response(struct mt76_dev *mdev, int cmd,
 	}
 
 	rxd = (struct mt76_connac2_mcu_rxd *)skb->data;
-	if (seq != rxd->seq)
+	if (seq != rxd->seq &&
+	    !(rxd->eid == MCU_CMD_EXT_CID &&
+	      rxd->ext_eid == MCU_EXT_EVENT_WA_TX_STAT))
 		return -EAGAIN;
 
 	if (cmd == MCU_CMD(PATCH_SEM_CONTROL)) {
@@ -395,12 +397,14 @@ void mt7915_mcu_rx_event(struct mt7915_dev *dev, struct sk_buff *skb)
 	struct mt76_connac2_mcu_rxd *rxd;
 
 	rxd = (struct mt76_connac2_mcu_rxd *)skb->data;
-	if (rxd->ext_eid == MCU_EXT_EVENT_THERMAL_PROTECT ||
-	    rxd->ext_eid == MCU_EXT_EVENT_FW_LOG_2_HOST ||
-	    rxd->ext_eid == MCU_EXT_EVENT_ASSERT_DUMP ||
-	    rxd->ext_eid == MCU_EXT_EVENT_PS_SYNC ||
-	    rxd->ext_eid == MCU_EXT_EVENT_BCC_NOTIFY ||
-	    !rxd->seq)
+	if ((rxd->ext_eid == MCU_EXT_EVENT_THERMAL_PROTECT ||
+	     rxd->ext_eid == MCU_EXT_EVENT_FW_LOG_2_HOST ||
+	     rxd->ext_eid == MCU_EXT_EVENT_ASSERT_DUMP ||
+	     rxd->ext_eid == MCU_EXT_EVENT_PS_SYNC ||
+	     rxd->ext_eid == MCU_EXT_EVENT_BCC_NOTIFY ||
+	     !rxd->seq) &&
+	     !(rxd->eid == MCU_CMD_EXT_CID &&
+	       rxd->ext_eid == MCU_EXT_EVENT_WA_TX_STAT))
 		mt7915_mcu_rx_unsolicited_event(dev, skb);
 	else
 		mt76_mcu_rx_event(&dev->mt76, skb);
@@ -3733,6 +3737,62 @@ int mt7915_mcu_twt_agrt_update(struct mt7915_dev *dev,
 				 &req, sizeof(req), true);
 }
 
+int mt7915_mcu_wed_wa_tx_stats(struct mt7915_dev *dev, u16 wlan_idx)
+{
+	struct {
+		__le32 cmd;
+		__le32 num;
+		__le32 __rsv;
+		__le16 wlan_idx;
+	} req = {
+		.cmd = cpu_to_le32(0x15),
+		.num = cpu_to_le32(1),
+		.wlan_idx = cpu_to_le16(wlan_idx),
+	};
+	struct mt7915_mcu_wa_tx_stat {
+		__le16 wlan_idx;
+		u8 __rsv[2];
+
+		/* tx_bytes is deprecated since WA byte counter uses u32,
+		 * which easily leads to overflow.
+		 */
+		__le32 tx_bytes;
+		__le32 tx_packets;
+	} *res;
+	struct mt76_wcid *wcid;
+	struct sk_buff *skb;
+	int ret;
+
+	ret = mt76_mcu_send_and_get_msg(&dev->mt76, MCU_WA_PARAM_CMD(QUERY),
+					&req, sizeof(req), true, &skb);
+	if (ret)
+		return ret;
+
+	if (!is_mt7915(&dev->mt76))
+		skb_pull(skb, 4);
+
+	res = (struct mt7915_mcu_wa_tx_stat *)skb->data;
+
+	if (le16_to_cpu(res->wlan_idx) != wlan_idx) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	rcu_read_lock();
+
+	wcid = rcu_dereference(dev->mt76.wcid[wlan_idx]);
+	if (wcid)
+		wcid->stats.tx_packets += le32_to_cpu(res->tx_packets);
+	else
+		ret = -EINVAL;
+
+	rcu_read_unlock();
+out:
+	dev_kfree_skb(skb);
+
+	return ret;
+}
+
 int mt7915_mcu_rf_regval(struct mt7915_dev *dev, u32 regidx, u32 *val, bool set)
 {
 	struct {

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

@@ -539,6 +539,7 @@ int mt7915_mcu_get_rx_rate(struct mt7915_phy *phy, struct ieee80211_vif *vif,
 			   struct ieee80211_sta *sta, struct rate_info *rate);
 int mt7915_mcu_rdd_background_enable(struct mt7915_phy *phy,
 				     struct cfg80211_chan_def *chandef);
+int mt7915_mcu_wed_wa_tx_stats(struct mt7915_dev *dev, u16 wcid);
 int mt7915_mcu_rf_regval(struct mt7915_dev *dev, u32 regidx, u32 *val, bool set);
 int mt7915_mcu_wa_cmd(struct mt7915_dev *dev, int cmd, u32 a1, u32 a2, u32 a3);
 int mt7915_mcu_fw_log_2_host(struct mt7915_dev *dev, u8 type, u8 ctrl);