linux-kernel - Re: [PATCH net 1/3] net: enetc: remove xdp_drops statistic from enetc_xdp

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Message-ID: <Zu1lpVUyiEMtQAlu@boxer>
Date: Fri, 20 Sep 2024 14:08:05 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Wei Fang <wei.fang@....com>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <claudiu.manoil@....com>, <vladimir.oltean@....com>,
	<ast@...nel.org>, <daniel@...earbox.net>, <hawk@...nel.org>,
	<john.fastabend@...il.com>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, <bpf@...r.kernel.org>, <stable@...r.kernel.org>,
	<imx@...ts.linux.dev>
Subject: Re: [PATCH net 1/3] net: enetc: remove xdp_drops statistic from
 enetc_xdp_drop()

On Thu, Sep 19, 2024 at 04:41:02PM +0800, Wei Fang wrote:
> The xdp_drops statistic indicates the number of XDP frames dropped in
> the Rx direction. However, enetc_xdp_drop() is also used in XDP_TX and
> XDP_REDIRECT actions. If frame loss occurs in these two actions, the
> frames loss count should not be included in xdp_drops, because there
> are already xdp_tx_drops and xdp_redirect_failures to count the frame
> loss of these two actions, so it's better to remove xdp_drops statistic
> from enetc_xdp_drop() and increase xdp_drops in XDP_DROP action.
> 
> Fixes: 7ed2bc80074e ("net: enetc: add support for XDP_TX")
> Signed-off-by: Wei Fang <wei.fang@....com>

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

> ---
>  drivers/net/ethernet/freescale/enetc/enetc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
> index 032d8eadd003..56e59721ec7d 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc.c
> +++ b/drivers/net/ethernet/freescale/enetc/enetc.c
> @@ -1521,7 +1521,6 @@ static void enetc_xdp_drop(struct enetc_bdr *rx_ring, int rx_ring_first,
>  				  &rx_ring->rx_swbd[rx_ring_first]);
>  		enetc_bdr_idx_inc(rx_ring, &rx_ring_first);
>  	}
> -	rx_ring->stats.xdp_drops++;
>  }
>  
>  static int enetc_clean_rx_ring_xdp(struct enetc_bdr *rx_ring,
> @@ -1586,6 +1585,7 @@ static int enetc_clean_rx_ring_xdp(struct enetc_bdr *rx_ring,
>  			fallthrough;
>  		case XDP_DROP:
>  			enetc_xdp_drop(rx_ring, orig_i, i);
> +			rx_ring->stats.xdp_drops++;
>  			break;
>  		case XDP_PASS:
>  			rxbd = orig_rxbd;
> -- 
> 2.34.1
> 
>