net/mlx5e: IPoIB, Add ndo stats support for IPoIB netdevices

Expose RX and TX counters by implementing ndo_get_stats64 operation for
both parent devices.
After this change, all the relevant statistics can be retrieved using
ifconfig.
Signed-off-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c

@@ -45,6 +45,7 @@ static int mlx5i_change_mtu(struct net_device *netdev, int new_mtu);
 static const struct net_device_ops mlx5i_netdev_ops = {
 	.ndo_open                = mlx5i_open,
 	.ndo_stop                = mlx5i_close,
+	.ndo_get_stats64         = mlx5i_get_stats,
 	.ndo_init                = mlx5i_dev_init,
 	.ndo_uninit              = mlx5i_dev_cleanup,
 	.ndo_change_mtu          = mlx5i_change_mtu,
@@ -115,6 +116,47 @@ static void mlx5i_cleanup(struct mlx5e_priv *priv)
 	/* Do nothing .. */
 }
 
+void mlx5i_grp_sw_update_stats(struct mlx5e_priv *priv)
+{
+	struct mlx5e_sw_stats s = { 0 };
+	int i, j;
+
+	for (i = 0; i < priv->profile->max_nch(priv->mdev); i++) {
+		struct mlx5e_channel_stats *channel_stats;
+		struct mlx5e_rq_stats *rq_stats;
+
+		channel_stats = &priv->channel_stats[i];
+		rq_stats = &channel_stats->rq;
+
+		s.rx_packets += rq_stats->packets;
+		s.rx_bytes   += rq_stats->bytes;
+
+		for (j = 0; j < priv->max_opened_tc; j++) {
+			struct mlx5e_sq_stats *sq_stats = &channel_stats->sq[j];
+
+			s.tx_packets           += sq_stats->packets;
+			s.tx_bytes             += sq_stats->bytes;
+			s.tx_queue_dropped     += sq_stats->dropped;
+		}
+	}
+
+	memcpy(&priv->stats.sw, &s, sizeof(s));
+}
+
+void mlx5i_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
+{
+	struct mlx5e_priv     *priv   = mlx5i_epriv(dev);
+	struct mlx5e_sw_stats *sstats = &priv->stats.sw;
+
+	mlx5i_grp_sw_update_stats(priv);
+
+	stats->rx_packets = sstats->rx_packets;
+	stats->rx_bytes   = sstats->rx_bytes;
+	stats->tx_packets = sstats->tx_packets;
+	stats->tx_bytes   = sstats->tx_bytes;
+	stats->tx_dropped = sstats->tx_queue_dropped;
+}
+
 int mlx5i_init_underlay_qp(struct mlx5e_priv *priv)
 {
 	struct mlx5_core_dev *mdev = priv->mdev;

drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.h

@@ -121,6 +121,7 @@ static inline void mlx5i_sq_fetch_wqe(struct mlx5e_txqsq *sq,
 netdev_tx_t mlx5i_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb,
 			  struct mlx5_av *av, u32 dqpn, u32 dqkey);
 void mlx5i_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe);
+void mlx5i_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats);
 
 #endif /* CONFIG_MLX5_CORE_IPOIB */
 #endif /* __MLX5E_IPOB_H__ */