net/mlx5e: Fix trust state reset in reload

Setting dscp2prio during the driver reload can cause dcb ieee app list to be not empty after the reload finish and as a result to a conflict between the priority trust state reported by the app and the state in the device register. Reset the dcb ieee app list on initialization in case this is conflicting with the register status. Fixes: 2a5e7a1 ("net/mlx5e: Add dcbnl dscp to priority support") Signed-off-by: Moshe Tal <[email protected]> Signed-off-by: Saeed Mahameed <[email protected]>
niw · May 4, 2022 · b781bff · b781bff
1 parent 0e322ef
commit b781bff
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
@@ -1200,6 +1200,16 @@ static int mlx5e_trust_initialize(struct mlx5e_priv *priv)
 		return err;
 	WRITE_ONCE(priv->dcbx_dp.trust_state, trust_state);
 
+	if (priv->dcbx_dp.trust_state == MLX5_QPTS_TRUST_PCP && priv->dcbx.dscp_app_cnt) {
+		/*
+		 * Align the driver state with the register state.
+		 * Temporary state change is required to enable the app list reset.
+		 */
+		priv->dcbx_dp.trust_state = MLX5_QPTS_TRUST_DSCP;
+		mlx5e_dcbnl_delete_app(priv);
+		priv->dcbx_dp.trust_state = MLX5_QPTS_TRUST_PCP;
+	}
+
 	mlx5e_params_calc_trust_tx_min_inline_mode(priv->mdev, &priv->channels.params,
 						   priv->dcbx_dp.trust_state);