From: Tariq Toukan <tariqt@nvidia.com>
Date: Wed, 11 Aug 2021 15:02:12 +0300
Subject: net/mlx5e: Handle errors of netdev_set_num_tc()
Patch-mainline: v5.15-rc1
Git-commit: 21ecfcb83a8588f21184eaa57c795c0c5a0eab2b
References: jsc#SLE-19253

Add handling for failures in netdev_set_num_tc().
Let mlx5e_netdev_set_tcs return an int.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c |   20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -2263,22 +2263,28 @@ void mlx5e_set_netdev_mtu_boundaries(str
 				ETH_MAX_MTU);
 }
 
-static void mlx5e_netdev_set_tcs(struct net_device *netdev, u16 nch, u8 ntc)
+static int mlx5e_netdev_set_tcs(struct net_device *netdev, u16 nch, u8 ntc)
 {
-	int tc;
+	int tc, err;
 
 	netdev_reset_tc(netdev);
 
 	if (ntc == 1)
-		return;
+		return 0;
 
-	netdev_set_num_tc(netdev, ntc);
+	err = netdev_set_num_tc(netdev, ntc);
+	if (err) {
+		netdev_WARN(netdev, "netdev_set_num_tc failed (%d), ntc = %d\n", err, ntc);
+		return err;
+	}
 
 	/* Map netdev TCs to offset 0
 	 * We have our own UP to TXQ mapping for QoS
 	 */
 	for (tc = 0; tc < ntc; tc++)
 		netdev_set_tc_queue(netdev, tc, nch, 0);
+
+	return 0;
 }
 
 int mlx5e_update_tx_netdev_queues(struct mlx5e_priv *priv)
@@ -2315,8 +2321,9 @@ static int mlx5e_update_netdev_queues(st
 	ntc = mlx5e_get_dcb_num_tc(&priv->channels.params);
 	num_rxqs = nch * priv->profile->rq_groups;
 
-	mlx5e_netdev_set_tcs(netdev, nch, ntc);
-
+	err = mlx5e_netdev_set_tcs(netdev, nch, ntc);
+	if (err)
+		goto err_out;
 	err = mlx5e_update_tx_netdev_queues(priv);
 	if (err)
 		goto err_tcs;
@@ -2338,6 +2345,7 @@ err_txqs:
 
 err_tcs:
 	mlx5e_netdev_set_tcs(netdev, old_num_txqs / old_ntc, old_ntc);
+err_out:
 	return err;
 }