net/mlx5e: Fix the max MTU check in case of XDP
[ Upstream commit d460c271 ] MLX5E_XDP_MAX_MTU was calculated incorrectly. It didn't account for NET_IP_ALIGN and MLX5E_HW2SW_MTU, and it also misused MLX5_SKB_FRAG_SZ. This commit fixes the calculations and adds a brief explanation for the formula used. Fixes: a26a5bdf ("net/mlx5e: Restrict the combination of large MTU and XDP") Signed-off-by: NMaxim Mikityanskiy <maximmi@mellanox.com> Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
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