netdev - Re: [PATCH net-next v2 4/5] net/mlx5e: Add PSP stats support for Rx/Tx flows

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Message-ID: <0025ef2f3eb0787d6ee29111f936a86f865320cd.camel@nvidia.com>
Date: Thu, 30 Oct 2025 16:11:49 +0000
From: Cosmin Ratiu <cratiu@...dia.com>
To: "andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, Saeed Mahameed
	<saeedm@...dia.com>, "davem@...emloft.net" <davem@...emloft.net>, Tariq
 Toukan <tariqt@...dia.com>, "leon@...nel.org" <leon@...nel.org>,
	"shuah@...nel.org" <shuah@...nel.org>, Mark Bloch <mbloch@...dia.com>,
	"kuba@...nel.org" <kuba@...nel.org>, "horms@...nel.org" <horms@...nel.org>,
	"daniel.zahka@...il.com" <daniel.zahka@...il.com>, "donald.hunter@...il.com"
	<donald.hunter@...il.com>, Boris Pismenny <borisp@...dia.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "pabeni@...hat.com"
	<pabeni@...hat.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH net-next v2 4/5] net/mlx5e: Add PSP stats support for
 Rx/Tx flows

On Mon, 2025-10-27 at 17:00 -0700, Daniel Zahka wrote:
> @@ -670,9 +813,57 @@ static int accel_psp_fs_init_tx(struct
> mlx5e_psp_fs *fs)
>  		return -ENOMEM;
>  
>  	mutex_init(&tx_fs->mutex);
> +	flow_counter = mlx5_fc_create(mdev, false);
> +	if (IS_ERR(flow_counter)) {
> +		mlx5_core_warn(mdev,
> +			       "fail to create psp tx flow counter
> err=%pe\n",
> +			       flow_counter);
> +		err = PTR_ERR(flow_counter);
> +		goto out_err;
> +	}
> +	tx_fs->tx_counter = flow_counter;

Nit: Moving the flow counter init before the mutex init would simplify
cleanup a bit (simple return instead of goto out_err).

> +static void
> +mlx5e_accel_psp_fs_get_stats_fill(struct mlx5e_priv *priv, void
> *psp_stats)
> +{
> +	struct mlx5e_psp_stats *stats = (struct mlx5e_psp_stats
> *)psp_stats;

Why can't this function receive an mlx5e_psp_stats pointer directly? It
would avoid the boilerplate cast.

> +static void
> +mlx5e_psp_get_stats(struct psp_dev *psd, struct psp_dev_stats
> *stats)
> +{
> +	struct mlx5e_priv *priv = netdev_priv(psd->main_netdev);
> +	struct mlx5e_psp_stats nstats;
> +
> +	mlx5e_accel_psp_fs_get_stats_fill(priv, &nstats);

I don't see the point of the intermediate struct mlx5e_psp_stats, this
function could query counters directly into stats.
>  
> +struct mlx5e_psp_stats {
> +	u64 psp_rx_pkts;
> +	u64 psp_rx_bytes;
> +	u64 psp_rx_pkts_auth_fail;
> +	u64 psp_rx_bytes_auth_fail;
> +	u64 psp_rx_pkts_frame_err;
> +	u64 psp_rx_bytes_frame_err;
> +	u64 psp_rx_pkts_drop;
> +	u64 psp_rx_bytes_drop;
> +	u64 psp_tx_pkts;
> +	u64 psp_tx_bytes;
> +	u64 psp_tx_pkts_drop;
> +	u64 psp_tx_bytes_drop;
> +};
> +
>  struct mlx5e_psp {
>  	struct psp_dev *psp;
>  	struct psp_dev_caps caps;
>  	struct mlx5e_psp_fs *fs;
>  	atomic_t tx_key_cnt;
> +	atomic_t tx_drop;
> +	/* Stats manage */
> +	struct mlx5e_psp_stats stats;

This does not appear written anywhere. Is it planned to be used in a
future patch?

Cosmin.