netdev - Re: [PATCH RFC v2 16/33] mlx4: add XDP frame size and adjust max XDP MTU

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Date:   Wed, 8 Apr 2020 15:57:00 +0300
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, sameehj@...zon.com
Cc:     Tariq Toukan <tariqt@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, zorik@...zon.com, akiyano@...zon.com,
        gtzalik@...zon.com,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        David Ahern <dsahern@...il.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Subject: Re: [PATCH RFC v2 16/33] mlx4: add XDP frame size and adjust max XDP
 MTU



On 4/8/2020 2:51 PM, Jesper Dangaard Brouer wrote:
> The mlx4 drivers size of memory backing the RX packet is stored in
> frag_stride. For XDP mode this will be PAGE_SIZE (normally 4096).
> For normal mode frag_stride is 2048.
> 
> Also adjust MLX4_EN_MAX_XDP_MTU to take tailroom into account.
> 
> Cc: Tariq Toukan <tariqt@...lanox.com>
> Cc: Saeed Mahameed <saeedm@...lanox.com>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> ---
>   drivers/net/ethernet/mellanox/mlx4/en_netdev.c |    3 ++-
>   drivers/net/ethernet/mellanox/mlx4/en_rx.c     |    1 +
>   2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index 43dcbd8214c6..5bd3cd37d50f 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -51,7 +51,8 @@
>   #include "en_port.h"
>   
>   #define MLX4_EN_MAX_XDP_MTU ((int)(PAGE_SIZE - ETH_HLEN - (2 * VLAN_HLEN) - \
> -				   XDP_PACKET_HEADROOM))
> +				XDP_PACKET_HEADROOM -			    \
> +				SKB_DATA_ALIGN(sizeof(struct skb_shared_info))))
>   
>   int mlx4_en_setup_tc(struct net_device *dev, u8 up)
>   {
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> index db3552f2d087..231f08c0276c 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> @@ -683,6 +683,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
>   	rcu_read_lock();
>   	xdp_prog = rcu_dereference(ring->xdp_prog);
>   	xdp.rxq = &ring->xdp_rxq;
> +	xdp.frame_sz = priv->frag_info[0].frag_stride;
>   	doorbell_pending = 0;
>   
>   	/* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
> 
> 

Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
Thanks.