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net/mlx5e: Don't treat small ceil values as unlimited in HTB offload

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commit 736dfe4e68 upstream.

The hardware spec defines max_average_bw == 0 as "unlimited bandwidth".
max_average_bw is calculated as `ceil / BYTES_IN_MBIT`, which can become
0 when ceil is small, leading to an undesired effect of having no
bandwidth limit.

This commit fixes it by rounding up small values of ceil to 1 Mbit/s.

Fixes: 214baf2287 ("net/mlx5e: Support HTB offload")
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maxim Mikityanskiy
2022-01-18 13:31:54 +02:00
committed by Greg Kroah-Hartman
parent f232acbb78
commit 5d575586c4
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/mellanox/mlx5/core/en/qos.c
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@@ -553,7 +553,8 @@ static int mlx5e_htb_convert_rate(struct mlx5e_priv *priv, u64 rate,
static void mlx5e_htb_convert_ceil(struct mlx5e_priv *priv, u64 ceil, u32 *max_average_bw)
{
*max_average_bw = div_u64(ceil, BYTES_IN_MBIT);
/* Hardware treats 0 as "unlimited", set at least 1. */
*max_average_bw = max_t(u32, div_u64(ceil, BYTES_IN_MBIT), 1);
qos_dbg(priv->mdev, "Convert: ceil %llu -> max_average_bw %u\n",
ceil, *max_average_bw);