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

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Message-ID: <f4534665-cf8a-eba1-55b6-4344bd6a7d0b@gmail.com>
Date:   Mon, 19 Sep 2016 13:54:16 +0300
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
        tariqt@...lanox.com
Cc:     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 19/09/2016 10:40 AM, 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:
>   				if (mlx4_en_rx_recycle(ring, frags))
>   					goto consumed;
>   				goto next;
>
Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
Thanks.