wifi: mt76: add tx_nss histogram to ethtool stats

mt76_connac2_mac_fill_txs() counts tx_nss but ethtool doesn't show
stats. Add missing histogram accordingly.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mac80211.c

@@ -1744,6 +1744,9 @@ void mt76_ethtool_worker(struct mt76_ethtool_worker_info *wi,
 	for (i = 0; i < (eht ? 14 : 12); i++)
 		data[ei++] += stats->tx_mcs[i];
 
+	for (i = 0; i < 4; i++)
+		data[ei++] += stats->tx_nss[i];
+
 	wi->worker_stat_count = ei - wi->initial_stat_idx;
 }
 EXPORT_SYMBOL_GPL(mt76_ethtool_worker);

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

@@ -1280,6 +1280,10 @@ static const char mt7915_gstrings_stats[][ETH_GSTRING_LEN] = {
 	"v_tx_mcs_9",
 	"v_tx_mcs_10",
 	"v_tx_mcs_11",
+	"v_tx_nss_1",
+	"v_tx_nss_2",
+	"v_tx_nss_3",
+	"v_tx_nss_4",
 };
 
 #define MT7915_SSTATS_LEN ARRAY_SIZE(mt7915_gstrings_stats)

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

@@ -1077,6 +1077,10 @@ static const char mt7921_gstrings_stats[][ETH_GSTRING_LEN] = {
 	"v_tx_mcs_9",
 	"v_tx_mcs_10",
 	"v_tx_mcs_11",
+	"v_tx_nss_1",
+	"v_tx_nss_2",
+	"v_tx_nss_3",
+	"v_tx_nss_4",
 };
 
 static void

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

@@ -1177,6 +1177,10 @@ static const char mt7996_gstrings_stats[][ETH_GSTRING_LEN] = {
 	"v_tx_mcs_11",
 	"v_tx_mcs_12",
 	"v_tx_mcs_13",
+	"v_tx_nss_1",
+	"v_tx_nss_2",
+	"v_tx_nss_3",
+	"v_tx_nss_4",
 };
 
 #define MT7996_SSTATS_LEN ARRAY_SIZE(mt7996_gstrings_stats)