net: hns3: Fix an error of total drop packet statistics

The dropped tx/rx packets number of each tqp should also
be counted into the total drop tx/rx packets numbers.

Fixes: 76ad4f0e ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -1139,6 +1139,8 @@ hns3_nic_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
 	u64 rx_bytes = 0;
 	u64 tx_pkts = 0;
 	u64 rx_pkts = 0;
+	u64 tx_drop = 0;
+	u64 rx_drop = 0;
 
 	if (test_bit(HNS3_NIC_STATE_DOWN, &priv->state))
 		return;
@@ -1152,6 +1154,8 @@ hns3_nic_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
 			start = u64_stats_fetch_begin_irq(&ring->syncp);
 			tx_bytes += ring->stats.tx_bytes;
 			tx_pkts += ring->stats.tx_pkts;
+			tx_drop += ring->stats.tx_busy;
+			tx_drop += ring->stats.sw_err_cnt;
 		} while (u64_stats_fetch_retry_irq(&ring->syncp, start));
 
 		/* fetch the rx stats */
@@ -1160,6 +1164,9 @@ hns3_nic_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
 			start = u64_stats_fetch_begin_irq(&ring->syncp);
 			rx_bytes += ring->stats.rx_bytes;
 			rx_pkts += ring->stats.rx_pkts;
+			rx_drop += ring->stats.non_vld_descs;
+			rx_drop += ring->stats.err_pkt_len;
+			rx_drop += ring->stats.l2_err;
 		} while (u64_stats_fetch_retry_irq(&ring->syncp, start));
 	}
 
@@ -1175,8 +1182,8 @@ hns3_nic_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
 	stats->rx_missed_errors = netdev->stats.rx_missed_errors;
 
 	stats->tx_errors = netdev->stats.tx_errors;
-	stats->rx_dropped = netdev->stats.rx_dropped;
-	stats->tx_dropped = netdev->stats.tx_dropped;
+	stats->rx_dropped = rx_drop + netdev->stats.rx_dropped;
+	stats->tx_dropped = tx_drop + netdev->stats.tx_dropped;
 	stats->collisions = netdev->stats.collisions;
 	stats->rx_over_errors = netdev->stats.rx_over_errors;
 	stats->rx_frame_errors = netdev->stats.rx_frame_errors;