net/mlx5e: Report mlx5e_xdp_set errors

If the channels fail to reopen after setting an XDP program, return the
error code instead of 0. A proper fix is still needed, as now any error
while reopening the channels brings the interface down. This patch only
adds error reporting.
Signed-off-by: NMaxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: NTariq Toukan <tariqt@mellanox.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -4313,7 +4313,7 @@ static int mlx5e_xdp_set(struct net_device *netdev, struct bpf_prog *prog)
 		mlx5e_set_rq_type(priv->mdev, &priv->channels.params);
 
 	if (was_opened && reset)
-		mlx5e_open_locked(netdev);
+		err = mlx5e_open_locked(netdev);
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state) || reset)
 		goto unlock;