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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>
This commit is contained in:
Saeed Mahameed 2018-05-23 18:26:09 -07:00
parent 2ad9ecdbe7
commit ed56c5193a
3 changed files with 8 additions and 6 deletions
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1
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -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 \

10
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -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);

3
drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
View File

@ -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));
}