netdev - Re: [net-next PATCH] mlx5: handle DMA mapping error case for XDP redirect

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Date:   Tue, 31 Jul 2018 09:35:37 +0300
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>
Cc:     netdev@...r.kernel.org, eugenia@...lanox.com
Subject: Re: [net-next PATCH] mlx5: handle DMA mapping error case for XDP
 redirect



On 30/07/2018 8:49 PM, Jesper Dangaard Brouer wrote:
> Commit 58b99ee3e3eb ("net/mlx5e: Add support for XDP_REDIRECT in device-out side")
> forgot to return/free the xdp_frame in case the DMA mapping failed, correct this.
> 
> Also DMA unmap the frame in case mlx5e_xmit_xdp_frame() fails.
> 
> Fixes: 58b99ee3e3eb ("net/mlx5e: Add support for XDP_REDIRECT in device-out side")
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c |    3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> index bab8cd44d1c5..1881468dbcfa 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> @@ -283,6 +283,7 @@ int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
>   		xdpi.dma_addr = dma_map_single(sq->pdev, xdpf->data, xdpf->len,
>   					       DMA_TO_DEVICE);
>   		if (unlikely(dma_mapping_error(sq->pdev, xdpi.dma_addr))) {
> +			xdp_return_frame_rx_napi(xdpf);
>   			drops++;
>   			continue;
>   		}
> @@ -290,6 +291,8 @@ int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
>   		xdpi.xdpf = xdpf;
>   
>   		if (unlikely(!mlx5e_xmit_xdp_frame(sq, &xdpi))) {
> +			dma_unmap_single(sq->pdev, xdpi.dma_addr,
> +					 xdpf->len, DMA_TO_DEVICE);
>   			xdp_return_frame_rx_napi(xdpf);
>   			drops++;
>   		}
> 
Reviewed-by: Tariq Toukan <tariqt@...lanox.com>

Thanks Jesper!