net/mlx5: Fix LAG requirement when CONFIG_MLX5_ESWITCH is off

If CONFIG_MLX5_ESWITCH is not defined, test for SR-IOV being disabled,
instead of calling e-switch LAG prereq routine.

Since LAG with SRIOV is allowed only when switchdev mode is on.

Fixes: eff849b2 ("net/mlx5: Allow/disallow LAG according to pre-req only")
Signed-off-by: Aviv Heller <avivh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -291,12 +291,15 @@ static int mlx5_deactivate_lag(struct mlx5_lag *ldev)
 
 static bool mlx5_lag_check_prereq(struct mlx5_lag *ldev)
 {
-	if (ldev->pf[0].dev &&
-	    ldev->pf[1].dev &&
-	    mlx5_esw_lag_prereq(ldev->pf[0].dev, ldev->pf[1].dev))
-		return true;
-	else
+	if (!ldev->pf[0].dev || !ldev->pf[1].dev)
 		return false;
+
+#ifdef CONFIG_MLX5_ESWITCH
+	return mlx5_esw_lag_prereq(ldev->pf[0].dev, ldev->pf[1].dev);
+#else
+	return (!mlx5_sriov_is_enabled(ldev->pf[0].dev) &&
+		!mlx5_sriov_is_enabled(ldev->pf[1].dev));
+#endif
 }
 
 static void mlx5_lag_add_ib_devices(struct mlx5_lag *ldev)