FAILED: patch "[PATCH] net/mlx5e: Fix trust state reset in reload" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b781bff882d16175277ca129c382886cb4c74a2c Mon Sep 17 00:00:00 2001
From: Moshe Tal <[email protected]>
Date: Wed, 9 Feb 2022 19:23:56 +0200
Subject: [PATCH] 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.

index d659fe07d464..8ead2c82a52a 100644
@@ -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);