netdev - Re: [PATCH v5 net-next 13/13] mlx5: support BIG TCP packets

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Date:   Mon, 9 May 2022 15:30:11 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        Alexander Duyck <alexanderduyck@...com>,
        Coco Li <lixiaoyan@...gle.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>
Subject: Re: [PATCH v5 net-next 13/13] mlx5: support BIG TCP packets

On Mon, May 9, 2022 at 3:22 PM Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> From: Coco Li <lixiaoyan@...gle.com>
>
> mlx5 supports LSOv2.
>
> IPv6 gro/tcp stacks insert a temporary Hop-by-Hop header
> with JUMBO TLV for big packets.
>
> We need to ignore/skip this HBH header when populating TX descriptor.
>
> Note that ipv6_has_hopopt_jumbo() only recognizes very specific packet
> layout, thus mlx5e_sq_xmit_wqe() is taking care of this layout only.
>
> v2: clear hopbyhop in mlx5e_tx_get_gso_ihs()
> v4: fix compile error for CONFIG_MLX5_CORE_IPOIB=y
>
> Signed-off-by: Coco Li <lixiaoyan@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reviewed-by: Tariq Toukan <tariqt@...dia.com>
> Cc: Saeed Mahameed <saeedm@...dia.com>
> Cc: Leon Romanovsky <leon@...nel.org>
> ---
>  .../net/ethernet/mellanox/mlx5/core/en_main.c |  1 +
>  .../net/ethernet/mellanox/mlx5/core/en_tx.c   | 84 +++++++++++++++----
>  2 files changed, 69 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> index d27986869b8ba070d1a4f8bcdc7e14ab54ae984e..226825410a1aa55b5b7941a7389a78abdb800521 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -4920,6 +4920,7 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
>
>         netdev->priv_flags       |= IFF_UNICAST_FLT;
>
> +       netif_set_tso_max_size(netdev, 512 * 1024);

Apparently I forgot to amend this part on the final patch of the series.

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 226825410a1aa55b5b7941a7389a78abdb800521..bf3bca79e160124abd128ac1e9910cb2f39a39ff
100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4920,7 +4920,7 @@ static void mlx5e_build_nic_netdev(struct
net_device *netdev)

        netdev->priv_flags       |= IFF_UNICAST_FLT;

-       netif_set_tso_max_size(netdev, 512 * 1024);
+       netif_set_tso_max_size(netdev, GSO_MAX_SIZE);
        mlx5e_set_netdev_dev_addr(netdev);
        mlx5e_ipsec_build_netdev(priv);
        mlx5e_ktls_build_netdev(priv);