[TG3]: Do not count non-error frames dropped by the hardware as rx_errors.

Instead, count them as part of rx_missed_errors.
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -6893,8 +6893,7 @@ static struct net_device_stats *tg3_get_stats(struct net_device *dev)
 		get_stat64(&hw_stats->tx_octets);
 
 	stats->rx_errors = old_stats->rx_errors +
-		get_stat64(&hw_stats->rx_errors) +
-		get_stat64(&hw_stats->rx_discards);
+		get_stat64(&hw_stats->rx_errors);
 	stats->tx_errors = old_stats->tx_errors +
 		get_stat64(&hw_stats->tx_errors) +
 		get_stat64(&hw_stats->tx_mac_errors) +
@@ -6922,6 +6921,9 @@ static struct net_device_stats *tg3_get_stats(struct net_device *dev)
 	stats->rx_crc_errors = old_stats->rx_crc_errors +
 		calc_crc_errors(tp);
 
+	stats->rx_missed_errors = old_stats->rx_missed_errors +
+		get_stat64(&hw_stats->rx_discards);
+
 	return stats;
 }