diff mbox series

[net,10/12] net/mlx5e: Revert parameters on errors when changing trust state without reset

Message ID 20210126234345.202096-11-saeedm@nvidia.com
State New
Headers show
Series mlx5 fixes 2021-01-26 | expand

Commit Message

Saeed Mahameed Jan. 26, 2021, 11:43 p.m. UTC 
From: Maxim Mikityanskiy <maximmi@mellanox.com>

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: 6e0504c69811 ("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>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
index d20243d6a032..f23c67575073 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
@@ -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);