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net/mlx5: Disable QoS when min_rates on all VFs are zero

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[ Upstream commit 470b747582 ]

Currently when QoS is enabled for VF and any min_rate is configured,
the driver sets bw_share value to at least 1 and doesn’t allow to set
it to 0 to make minimal rate unlimited. It means there is always a
minimal rate configured for every VF, even if user tries to remove it.

In order to make QoS disable possible, check whether all vports have
configured min_rate = 0. If this is true, set their bw_share to 0 to
disable min_rate limitations.

Fixes: c9497c9890 ("net/mlx5: Add support for setting VF min rate")
Signed-off-by: Vladyslav Tarasiuk <vladyslavt@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vladyslav Tarasiuk
2020-10-21 11:05:41 +03:00
committed by Greg Kroah-Hartman
parent 3f9f112a63
commit 7204f0be5b
1 changed files with 8 additions and 7 deletions
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15
drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
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@@ -2369,12 +2369,15 @@ static u32 calculate_vports_min_rate_divider(struct mlx5_eswitch *esw)
max_guarantee = evport->info.min_rate;
}
return max_t(u32, max_guarantee / fw_max_bw_share, 1);
if (max_guarantee)
return max_t(u32, max_guarantee / fw_max_bw_share, 1);
return 0;
}
static int normalize_vports_min_rate(struct mlx5_eswitch *esw, u32 divider)
static int normalize_vports_min_rate(struct mlx5_eswitch *esw)
{
u32 fw_max_bw_share = MLX5_CAP_QOS(esw->dev, max_tsar_bw_share);
u32 divider = calculate_vports_min_rate_divider(esw);
struct mlx5_vport *evport;
u32 vport_max_rate;
u32 vport_min_rate;
@@ -2387,9 +2390,9 @@ static int normalize_vports_min_rate(struct mlx5_eswitch *esw, u32 divider)
continue;
vport_min_rate = evport->info.min_rate;
vport_max_rate = evport->info.max_rate;
bw_share = MLX5_MIN_BW_SHARE;
bw_share = 0;
if (vport_min_rate)
if (divider)
bw_share = MLX5_RATE_TO_BW_SHARE(vport_min_rate,
divider,
fw_max_bw_share);
@@ -2414,7 +2417,6 @@ int mlx5_eswitch_set_vport_rate(struct mlx5_eswitch *esw, u16 vport,
struct mlx5_vport *evport = mlx5_eswitch_get_vport(esw, vport);
u32 fw_max_bw_share;
u32 previous_min_rate;
u32 divider;
bool min_rate_supported;
bool max_rate_supported;
int err = 0;
@@ -2439,8 +2441,7 @@ int mlx5_eswitch_set_vport_rate(struct mlx5_eswitch *esw, u16 vport,
previous_min_rate = evport->info.min_rate;
evport->info.min_rate = min_rate;
divider = calculate_vports_min_rate_divider(esw);
err = normalize_vports_min_rate(esw, divider);
err = normalize_vports_min_rate(esw);
if (err) {
evport->info.min_rate = previous_min_rate;
goto unlock;