mlx5: implement ethtool::get_fec_stats

Report corrected bits.

v2: catch reg access errors (Saeed)
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -1602,6 +1602,14 @@ static int mlx5e_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
 	return mlx5_set_port_wol(mdev, mlx5_wol_mode);
 }
 
+static void mlx5e_get_fec_stats(struct net_device *netdev,
+				struct ethtool_fec_stats *fec_stats)
+{
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+
+	mlx5e_stats_fec_get(priv, fec_stats);
+}
+
 static int mlx5e_get_fecparam(struct net_device *netdev,
 			      struct ethtool_fecparam *fecparam)
 {
@@ -2209,6 +2217,7 @@ const struct ethtool_ops mlx5e_ethtool_ops = {
 	.self_test         = mlx5e_self_test,
 	.get_msglevel      = mlx5e_get_msglevel,
 	.set_msglevel      = mlx5e_set_msglevel,
+	.get_fec_stats     = mlx5e_get_fec_stats,
 	.get_fecparam      = mlx5e_get_fecparam,
 	.set_fecparam      = mlx5e_set_fecparam,
 };

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

@@ -768,10 +768,10 @@ static MLX5E_DECLARE_STATS_GRP_OP_UPDATE_STATS(802_3)
 	mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
 }
 
-#define MLX5E_READ_CTR64_BE_F(ptr, c)			\
+#define MLX5E_READ_CTR64_BE_F(ptr, set, c)		\
 	be64_to_cpu(*(__be64 *)((char *)ptr +		\
 		MLX5_BYTE_OFF(ppcnt_reg,		\
-			counter_set.eth_802_3_cntrs_grp_data_layout.c##_high)))
+			      counter_set.set.c##_high)))
 
 void mlx5e_stats_pause_get(struct mlx5e_priv *priv,
 			   struct ethtool_pause_stats *pause_stats)
@@ -791,9 +791,11 @@ void mlx5e_stats_pause_get(struct mlx5e_priv *priv,
 
 	pause_stats->tx_pause_frames =
 		MLX5E_READ_CTR64_BE_F(ppcnt_ieee_802_3,
+				      eth_802_3_cntrs_grp_data_layout,
 				      a_pause_mac_ctrl_frames_transmitted);
 	pause_stats->rx_pause_frames =
 		MLX5E_READ_CTR64_BE_F(ppcnt_ieee_802_3,
+				      eth_802_3_cntrs_grp_data_layout,
 				      a_pause_mac_ctrl_frames_received);
 }
 
@@ -1015,6 +1017,29 @@ static MLX5E_DECLARE_STATS_GRP_OP_UPDATE_STATS(phy)
 	mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
 }
 
+void mlx5e_stats_fec_get(struct mlx5e_priv *priv,
+			 struct ethtool_fec_stats *fec_stats)
+{
+	u32 ppcnt_phy_statistical[MLX5_ST_SZ_DW(ppcnt_reg)];
+	struct mlx5_core_dev *mdev = priv->mdev;
+	u32 in[MLX5_ST_SZ_DW(ppcnt_reg)] = {0};
+	int sz = MLX5_ST_SZ_BYTES(ppcnt_reg);
+
+	if (!MLX5_CAP_PCAM_FEATURE(mdev, ppcnt_statistical_group))
+		return;
+
+	MLX5_SET(ppcnt_reg, in, local_port, 1);
+	MLX5_SET(ppcnt_reg, in, grp, MLX5_PHYSICAL_LAYER_STATISTICAL_GROUP);
+	if (mlx5_core_access_reg(mdev, in, sz, ppcnt_phy_statistical,
+				 sz, MLX5_REG_PPCNT, 0, 0))
+		return;
+
+	fec_stats->corrected_bits.total =
+		MLX5E_READ_CTR64_BE_F(ppcnt_phy_statistical,
+				      phys_layer_statistical_cntrs,
+				      phy_corrected_bits);
+}
+
 #define PPORT_ETH_EXT_OFF(c) \
 	MLX5_BYTE_OFF(ppcnt_reg, \
 		      counter_set.eth_extended_cntrs_grp_data_layout.c##_high)

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

@@ -114,6 +114,8 @@ void mlx5e_stats_update_ndo_stats(struct mlx5e_priv *priv);
 
 void mlx5e_stats_pause_get(struct mlx5e_priv *priv,
 			   struct ethtool_pause_stats *pause_stats);
+void mlx5e_stats_fec_get(struct mlx5e_priv *priv,
+			 struct ethtool_fec_stats *fec_stats);
 
 /* Concrete NIC Stats */