net/mlx5e: Validate MTU when building non-linear legacy RQ fragments info

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mlx5e_build_rq_frags_info() assumes that MTU is not bigger than
PAGE_SIZE * MLX5E_MAX_RX_FRAGS, which is 16K for 4K pages. Currently,
the firmware limits MTU to 10K, so the assumption doesn't lead to a bug.

This commits adds an additional driver check for reliability, since the
firmware boundary might be changed.

The calculation is taken to a separate function with a comment
explaining it. It's a preparation for the following patches that
introcuce XDP multi buffer support.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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Maxim Mikityanskiy 2022-02-14 19:59:19 +02:00 • committed by Saeed Mahameed

parent 1abea24af4

commit 7c3b4df594

1 changed files with 27 additions and 7 deletions

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drivers/net/ethernet/mellanox/mlx5/core/en/params.c

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