On 5/28/2024 11:11 AM, Joe Damato wrote:
> mlx4_en_alloc_frags currently returns -ENOMEM when mlx4_alloc_page
> fails but does not increment a stat field when this occurs.
>
> A new field called alloc_fail has been added to struct mlx4_en_rx_ring
> which is now incremented in mlx4_en_rx_ring when -ENOMEM occurs.
>
> Signed-off-by: Joe Damato <jdamato@xxxxxxxxxx>
> Tested-by: Martin Karsten <mkarsten@xxxxxxxxxxxx>
> Reviewed-by: Tariq Toukan <tariqt@xxxxxxxxxx>
> ---
> drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 1 +
> drivers/net/ethernet/mellanox/mlx4/en_rx.c | 4 +++-
> drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 1 +
> 3 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index 4c089cfa027a..4d2f8c458346 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -2073,6 +2073,7 @@ static void mlx4_en_clear_stats(struct net_device *dev)
> priv->rx_ring[i]->csum_ok = 0;
> priv->rx_ring[i]->csum_none = 0;
> priv->rx_ring[i]->csum_complete = 0;
> + priv->rx_ring[i]->alloc_fail = 0;
> }
> }
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> index 8328df8645d5..15c57e9517e9 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> @@ -82,8 +82,10 @@ static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
>
> for (i = 0; i < priv->num_frags; i++, frags++) {
> if (!frags->page) {
> - if (mlx4_alloc_page(priv, frags, gfp))
> + if (mlx4_alloc_page(priv, frags, gfp)) {
> + ring->alloc_fail++;
> return -ENOMEM;
> + }
> ring->rx_alloc_pages++;
> }
> rx_desc->data[i].addr = cpu_to_be64(frags->dma +
> diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> index efe3f97b874f..cd70df22724b 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> @@ -355,6 +355,7 @@ struct mlx4_en_rx_ring {
> unsigned long xdp_tx;
> unsigned long xdp_tx_full;
> unsigned long dropped;
> + unsigned long alloc_fail;
> int hwtstamp_rx_filter;
> cpumask_var_t affinity_mask;
> struct xdp_rxq_info xdp_rxq;
This patch does not appear to extend either a netdev, ethtool, devlink,
or any other interface to report this new counter.
How is a user supposed to obtain this information from the driver?
