On 5/30/2024 2:08 PM, Jacob Keller wrote:
>
>
> 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?
Ah. Its used in the 3rd patch.
Reviewed-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>
