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net/mlx5e: Revert parameters on errors when changing trust state without reset

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[ Upstream commit 912c9b5fcc ]

Trust state may be changed without recreating the channels. It happens
when the channels are closed, and when channel parameters (min inline
mode) stay the same after changing the trust state. Changing the trust
state is a hardware command that may fail. The current code didn't
restore the channel parameters to their old values if an error happened
and the channels were closed. This commit adds handling for this case.

Fixes: 6e0504c698 ("net/mlx5e: Change inline mode correctly when changing trust state")
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxim Mikityanskiy
2021-01-14 12:34:01 +02:00
committed by Greg Kroah-Hartman
parent 890f413ae5
commit f24b493eba
1 changed files with 8 additions and 5 deletions
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13
drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
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@@ -1151,6 +1151,7 @@ static int mlx5e_set_trust_state(struct mlx5e_priv *priv, u8 trust_state)
{
struct mlx5e_channels new_channels = {};
bool reset_channels = true;
bool opened;
int err = 0;
mutex_lock(&priv->state_lock);
@@ -1159,22 +1160,24 @@ static int mlx5e_set_trust_state(struct mlx5e_priv *priv, u8 trust_state)
mlx5e_params_calc_trust_tx_min_inline_mode(priv->mdev, &new_channels.params,
trust_state);
if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) {
priv->channels.params = new_channels.params;
opened = test_bit(MLX5E_STATE_OPENED, &priv->state);
if (!opened)
reset_channels = false;
}
/* Skip if tx_min_inline is the same */
if (new_channels.params.tx_min_inline_mode ==
priv->channels.params.tx_min_inline_mode)
reset_channels = false;
if (reset_channels)
if (reset_channels) {
err = mlx5e_safe_switch_channels(priv, &new_channels,
mlx5e_update_trust_state_hw,
&trust_state);
else
} else {
err = mlx5e_update_trust_state_hw(priv, &trust_state);
if (!err && !opened)
priv->channels.params = new_channels.params;
}
mutex_unlock(&priv->state_lock);