net/mlx5e: Update NIC HW stats on demand only

Disable periodic stats update background thread and update stats in
background on demand when ndo_get_stats is called.

Having a background thread running in the driver all the time is bad for
power consumption and normally a user space daemon will query the stats
once every specific interval, so ideally the background thread and its
interval can be done in user space..

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index eb9eb7a..e2b7586 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -137,7 +137,6 @@ struct page_pool;
 #define MLX5E_MAX_NUM_CHANNELS         (MLX5E_INDIR_RQT_SIZE >> 1)
 #define MLX5E_MAX_NUM_SQS              (MLX5E_MAX_NUM_CHANNELS * MLX5E_MAX_NUM_TC)
 #define MLX5E_TX_CQ_POLL_BUDGET        128
-#define MLX5E_UPDATE_STATS_INTERVAL    200 /* msecs */
 #define MLX5E_SQ_RECOVER_MIN_INTERVAL  500 /* msecs */
 
 #define MLX5E_UMR_WQE_INLINE_SZ \

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 42ef8c8..ba9ae05 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -270,12 +270,9 @@ void mlx5e_update_stats_work(struct work_struct *work)
        struct delayed_work *dwork = to_delayed_work(work);
        struct mlx5e_priv *priv = container_of(dwork, struct mlx5e_priv,
                                               update_stats_work);
+
        mutex_lock(&priv->state_lock);
-       if (test_bit(MLX5E_STATE_OPENED, &priv->state)) {
-               priv->profile->update_stats(priv);
-               queue_delayed_work(priv->wq, dwork,
-                                  msecs_to_jiffies(MLX5E_UPDATE_STATS_INTERVAL));
-       }
+       priv->profile->update_stats(priv);
        mutex_unlock(&priv->state_lock);
 }
 
@@ -3405,6 +3402,9 @@ mlx5e_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
        struct mlx5e_vport_stats *vstats = &priv->stats.vport;
        struct mlx5e_pport_stats *pstats = &priv->stats.pport;
 
+       /* update HW stats in background for next time */
+       queue_delayed_work(priv->wq, &priv->update_stats_work, 0);
+
        if (mlx5e_is_uplink_rep(priv)) {
                stats->rx_packets = PPORT_802_3_GET(pstats, a_frames_received_ok);
                stats->rx_bytes   = PPORT_802_3_GET(pstats, a_octets_received_ok);

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index 3f2fe95..7db7552 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -893,6 +893,9 @@ mlx5e_rep_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
 {
        struct mlx5e_priv *priv = netdev_priv(dev);
 
+       /* update HW stats in background for next time */
+       queue_delayed_work(priv->wq, &priv->update_stats_work, 0);
+
        memcpy(stats, &priv->stats.vf_vport, sizeof(*stats));
 }