net/mlx5e: Add link down events counter

Expose link_down_events counter through ethtool -S.
This counter is read from PPort statistics, then proccessed and stored as
a special handling software counter.
This counter is stored along software counters since it is the only PPort
counter that it's size is not 64 bits.

Signed-off-by: Gal Pressman <galp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index ef66ba6..61e261c 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -135,6 +135,10 @@ static void mlx5e_update_sw_counters(struct mlx5e_priv *priv)
        s->tx_csum_offload = s->tx_packets - tx_offload_none - s->tx_csum_inner;
        s->rx_csum_good    = s->rx_packets - s->rx_csum_none -
                             s->rx_csum_sw;
+
+       s->link_down_events = MLX5_GET(ppcnt_reg,
+                               priv->stats.pport.phy_counters,
+                               counter_set.phys_layer_cntrs.link_down_events);
 }
 
 static void mlx5e_update_vport_counters(struct mlx5e_priv *priv)
@@ -183,6 +187,10 @@ static void mlx5e_update_pport_counters(struct mlx5e_priv *priv)
        MLX5_SET(ppcnt_reg, in, grp, MLX5_RFC_2819_COUNTERS_GROUP);
        mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
 
+       out = pstats->phy_counters;
+       MLX5_SET(ppcnt_reg, in, grp, MLX5_PHYSICAL_LAYER_COUNTERS_GROUP);
+       mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
+
        MLX5_SET(ppcnt_reg, in, grp, MLX5_PER_PRIORITY_COUNTERS_GROUP);
        for (prio = 0; prio < NUM_PPORT_PRIO; prio++) {
                out = pstats->per_prio_counters[prio];
@@ -208,10 +216,10 @@ static void mlx5e_update_q_counter(struct mlx5e_priv *priv)
 
 void mlx5e_update_stats(struct mlx5e_priv *priv)
 {
-       mlx5e_update_sw_counters(priv);
        mlx5e_update_q_counter(priv);
        mlx5e_update_vport_counters(priv);
        mlx5e_update_pport_counters(priv);
+       mlx5e_update_sw_counters(priv);
 }
 
 static void mlx5e_update_stats_work(struct work_struct *work)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
index de27eea..7cd8cb4 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
@@ -71,6 +71,9 @@ struct mlx5e_sw_stats {
        u64 rx_mpwqe_filler;
        u64 rx_mpwqe_frag;
        u64 rx_buff_alloc_err;
+
+       /* Special handling counters */
+       u64 link_down_events;
 };
 
 static const struct counter_desc sw_stats_desc[] = {
@@ -96,6 +99,7 @@ static const struct counter_desc sw_stats_desc[] = {
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_mpwqe_filler) },
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_mpwqe_frag) },
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_buff_alloc_err) },
+       { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, link_down_events) },
 };
 
 struct mlx5e_qcounter_stats {
@@ -178,6 +182,7 @@ struct mlx5e_pport_stats {
        __be64 RFC_2863_counters[MLX5_ST_SZ_QW(ppcnt_reg)];
        __be64 RFC_2819_counters[MLX5_ST_SZ_QW(ppcnt_reg)];
        __be64 per_prio_counters[NUM_PPORT_PRIO][MLX5_ST_SZ_QW(ppcnt_reg)];
+       __be64 phy_counters[MLX5_ST_SZ_QW(ppcnt_reg)];
 };
 
 static const struct counter_desc pport_802_3_stats_desc[] = {

diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index 8be44ca..942bcca 100644 (file)
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -1369,6 +1369,7 @@ enum {
        MLX5_ETHERNET_EXTENDED_COUNTERS_GROUP = 0x5,
        MLX5_PER_PRIORITY_COUNTERS_GROUP      = 0x10,
        MLX5_PER_TRAFFIC_CLASS_COUNTERS_GROUP = 0x11,
+       MLX5_PHYSICAL_LAYER_COUNTERS_GROUP    = 0x12,
        MLX5_INFINIBAND_PORT_COUNTERS_GROUP   = 0x20,
 };