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Message-ID: <6ccf0d63-809e-bd50-c0af-06580ca75745@gmail.com>
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.
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