netdev - Re: [PATCH net 2/2] mlx5: fix skb leak while fifo resync

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Message-ID: <8537aa82-8ac9-3f76-c8ae-395a60ccddf8@nvidia.com>
Date:   Mon, 23 Jan 2023 14:38:35 +0200
From:   Gal Pressman <gal@...dia.com>
To:     Vadim Fedorenko <vadfed@...a.com>, Aya Levin <ayal@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net 2/2] mlx5: fix skb leak while fifo resync

On 22/01/2023 18:16, Vadim Fedorenko wrote:
> During ptp resync operation SKBs were poped from the fifo but were never
> freed neither by napi_consume nor by dev_kfree_skb_any. Add call to
> napi_consume_skb to properly free SKBs.
> 
> Fixes: 19b43a432e3e ("net/mlx5e: Extend SKB room check to include PTP-SQ")

Same comment as previous patch?

> Signed-off-by: Vadim Fedorenko <vadfed@...a.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
> index 11a99e0f00c6..d60bb997c53b 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
> @@ -102,6 +102,7 @@ static bool mlx5e_ptp_skb_fifo_ts_cqe_resync(struct mlx5e_ptpsq *ptpsq, u16 skb_
>  		hwts.hwtstamp = mlx5e_skb_cb_get_hwts(skb)->cqe_hwtstamp;
>  		skb_tstamp_tx(skb, &hwts);
>  		ptpsq->cq_stats->resync_cqe++;
> +		napi_consume_skb(skb, 1);

Was wondering whether we should pass the actual budget here instead of
1, but looking at napi_consume_skb() it doesn't really matter..

Anyway:
Reviewed-by: Gal Pressman <gal@...dia.com>

>  		skb_cc = PTP_WQE_CTR2IDX(ptpsq->skb_fifo_cc);
>  	}
>