netdev - Re: [net-next PATCH] mlx4: add missed recycle opportunity for XDP

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Date:   Mon, 19 Sep 2016 07:28:35 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     netdev@...r.kernel.org, tariqt@...lanox.com, tom@...bertland.com,
        bblanco@...mgrid.com, rana.shahot@...il.com,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [net-next PATCH] mlx4: add missed recycle opportunity for
 XDP_TX on TX failure

On Mon, 2016-09-19 at 09:40 +0200, Jesper Dangaard Brouer wrote:
> Correct drop handling for XDP_TX on TX failure, were recently added in
> commit 95357907ae73 ("mlx4: fix XDP_TX is acting like XDP_PASS on TX
> ring full").
> 
> The change missed an opportunity for recycling the RX page, instead of
> going through the page allocator, like the regular XDP_DROP action does.
> This patch cease the opportunity, by going through the XDP_DROP case.
> 
> Fixes: 95357907ae73 ("mlx4: fix XDP_TX is acting like XDP_PASS on TX ring full")
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> ---
>  drivers/net/ethernet/mellanox/mlx4/en_rx.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> index c80073e4947f..919f0604d04a 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> @@ -906,11 +906,12 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
>  							length, tx_index,
>  							&doorbell_pending))
>  					goto consumed;
> -				goto next; /* Drop on xmit failure */
> +				goto xdp_drop; /* Drop on xmit failure */
>  			default:
>  				bpf_warn_invalid_xdp_action(act);
>  			case XDP_ABORTED:
>  			case XDP_DROP:
> +			xdp_drop:

A label should start at the beginning of the line (ie : not indented)

>  				if (mlx4_en_rx_recycle(ring, frags))
>  					goto consumed;
>  				goto next;
>