mt76: mt7921: add per-vif counters in ethtool

Similar to mt7915 driver, add per-vif tx counters in ethtool.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -902,7 +902,33 @@ static const char mt7921_gstrings_stats[][ETH_GSTRING_LEN] = {
 	"rx_mpdu_cnt",
 	"rx_ampdu_cnt",
 	"rx_ampdu_bytes_cnt",
-	"rx_ba_cnt"
+	"rx_ba_cnt",
+	/* per vif counters */
+	"v_tx_mode_cck",
+	"v_tx_mode_ofdm",
+	"v_tx_mode_ht",
+	"v_tx_mode_ht_gf",
+	"v_tx_mode_vht",
+	"v_tx_mode_he_su",
+	"v_tx_mode_he_ext_su",
+	"v_tx_mode_he_tb",
+	"v_tx_mode_he_mu",
+	"v_tx_bw_20",
+	"v_tx_bw_40",
+	"v_tx_bw_80",
+	"v_tx_bw_160",
+	"v_tx_mcs_0",
+	"v_tx_mcs_1",
+	"v_tx_mcs_2",
+	"v_tx_mcs_3",
+	"v_tx_mcs_4",
+	"v_tx_mcs_5",
+	"v_tx_mcs_6",
+	"v_tx_mcs_7",
+	"v_tx_mcs_8",
+	"v_tx_mcs_9",
+	"v_tx_mcs_10",
+	"v_tx_mcs_11",
 };
 
 static void
@@ -922,13 +948,30 @@ mt7921_get_et_sset_count(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	return sset == ETH_SS_STATS ? ARRAY_SIZE(mt7921_gstrings_stats) : 0;
 }
 
+static void
+mt7921_ethtool_worker(void *wi_data, struct ieee80211_sta *sta)
+{
+	struct mt7921_sta *msta = (struct mt7921_sta *)sta->drv_priv;
+	struct mt76_ethtool_worker_info *wi = wi_data;
+
+	if (msta->vif->mt76.idx != wi->idx)
+		return;
+
+	mt76_ethtool_worker(wi, &msta->stats);
+}
+
 static
 void mt7921_get_et_stats(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 			 struct ethtool_stats *stats, u64 *data)
 {
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
 	struct mt7921_phy *phy = mt7921_hw_phy(hw);
 	struct mt7921_dev *dev = phy->dev;
 	struct mib_stats *mib = &phy->mib;
+	struct mt76_ethtool_worker_info wi = {
+		.data = data,
+		.idx = mvif->mt76.idx,
+	};
 	int i, ei = 0;
 
 	mt7921_mutex_acquire(dev);
@@ -967,8 +1010,16 @@ void mt7921_get_et_stats(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	data[ei++] = mib->rx_ampdu_bytes_cnt;
 	data[ei++] = mib->rx_ba_cnt;
 
+	/* Add values for all stations owned by this vif */
+	wi.initial_stat_idx = ei;
+	ieee80211_iterate_stations_atomic(hw, mt7921_ethtool_worker, &wi);
+
 	mt7921_mutex_release(dev);
 
+	if (!wi.sta_count)
+		return;
+
+	ei += wi.worker_stat_count;
 	if (ei != ARRAY_SIZE(mt7921_gstrings_stats))
 		dev_err(dev->mt76.dev, "ei: %d  SSTATS_LEN: %lu",
 			ei, ARRAY_SIZE(mt7921_gstrings_stats));