WooCommerce Product Up-Sells Shortcode

functions.php

<?php
add_shortcode( 'product_upsells', 'wc_upsells_shortcode' );
function wc_upsells_shortcode( $atts ) {
  extract( shortcode_atts( array(
		'posts_per_page' => '-1',
		'columns' => '2',
		'orderby' => 'rand'
	), $atts ) );
	woocommerce_get_template( 'single-product/up-sells.php', array(
		'posts_per_page'  => $posts_per_page,
		'orderby'    => $orderby,
		'columns'    => $columns
	) );
}
?>