netdev - [net-next 12/14] net/mlx5e: Avoid query PPCNT register if not supported by the device

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Date:   Tue, 11 Dec 2018 15:24:07 -0800
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Eyal Davidovich <eyald@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 12/14] net/mlx5e: Avoid query PPCNT register if not supported by the device

From: Eyal Davidovich <eyald@...lanox.com>

PPCNT is not supported if PCAM access reg is supported and ppcnt bit is clear.

Signed-off-by: Eyal Davidovich <eyald@...lanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_stats.c | 12 ++++++++++++
 include/linux/mlx5/mlx5_ifc.h                      |  4 +++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
index 75d30fa637d6..8224f1e062a8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
@@ -483,6 +483,9 @@ static int mlx5e_grp_802_3_fill_stats(struct mlx5e_priv *priv, u64 *data,
 	return idx;
 }
 
+#define MLX5_BASIC_PPCNT_SUPPORTED(mdev) \
+	(MLX5_CAP_GEN(mdev, pcam_reg) ? MLX5_CAP_PCAM_REG(mdev, ppcnt) : 1)
+
 static void mlx5e_grp_802_3_update_stats(struct mlx5e_priv *priv)
 {
 	struct mlx5e_pport_stats *pstats = &priv->stats.pport;
@@ -491,6 +494,9 @@ static void mlx5e_grp_802_3_update_stats(struct mlx5e_priv *priv)
 	int sz = MLX5_ST_SZ_BYTES(ppcnt_reg);
 	void *out;
 
+	if (!MLX5_BASIC_PPCNT_SUPPORTED(mdev))
+		return;
+
 	MLX5_SET(ppcnt_reg, in, local_port, 1);
 	out = pstats->IEEE_802_3_counters;
 	MLX5_SET(ppcnt_reg, in, grp, MLX5_IEEE_802_3_COUNTERS_GROUP);
@@ -603,6 +609,9 @@ static void mlx5e_grp_2819_update_stats(struct mlx5e_priv *priv)
 	int sz = MLX5_ST_SZ_BYTES(ppcnt_reg);
 	void *out;
 
+	if (!MLX5_BASIC_PPCNT_SUPPORTED(mdev))
+		return;
+
 	MLX5_SET(ppcnt_reg, in, local_port, 1);
 	out = pstats->RFC_2819_counters;
 	MLX5_SET(ppcnt_reg, in, grp, MLX5_RFC_2819_COUNTERS_GROUP);
@@ -1078,6 +1087,9 @@ static void mlx5e_grp_per_prio_update_stats(struct mlx5e_priv *priv)
 	int prio;
 	void *out;
 
+	if (!MLX5_BASIC_PPCNT_SUPPORTED(mdev))
+		return;
+
 	MLX5_SET(ppcnt_reg, in, local_port, 1);
 	MLX5_SET(ppcnt_reg, in, grp, MLX5_PER_PRIORITY_COUNTERS_GROUP);
 	for (prio = 0; prio < NUM_PPORT_PRIO; prio++) {
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 60c1d49eb40c..c12b0dec2889 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -8283,7 +8283,9 @@ struct mlx5_ifc_pcam_regs_5000_to_507f_bits {
 	u8         port_access_reg_cap_mask_31_to_13[0x13];
 	u8         pbmc[0x1];
 	u8         pptb[0x1];
-	u8         port_access_reg_cap_mask_10_to_0[0xb];
+	u8         port_access_reg_cap_mask_10_to_09[0x2];
+	u8         ppcnt[0x1];
+	u8         port_access_reg_cap_mask_07_to_00[0x8];
 };
 
 struct mlx5_ifc_pcam_reg_bits {
-- 
2.19.2