#!/bin/bash# SPDX-License-Identifier: GPL-2.0 # Kselftest framework requirement - SKIP code is 4.ksft_skip=4 ALL_TESTS="loopback_test"NUM_NETIFS=2source tc_common.shsource lib.sh h1_create(){	simple_if_init $h1 192.0.2.1/24	tc qdisc add dev $h1 clsact} h1_destroy(){	tc qdisc del dev $h1 clsact	simple_if_fini $h1 192.0.2.1/24} h2_create(){	simple_if_init $h2} h2_destroy(){	simple_if_fini $h2} loopback_test(){	RET=0 	tc filter add dev $h1 ingress protocol arp pref 1 handle 101 flower \		skip_hw arp_op reply arp_tip 192.0.2.1 action drop 	$MZ $h1 -c 1 -t arp -q 	tc_check_packets "dev $h1 ingress" 101 1	check_fail $? "Matched on a filter without loopback setup" 	ethtool -K $h1 loopback on	check_err $? "Failed to enable loopback" 	setup_wait_dev $h1 	$MZ $h1 -c 1 -t arp -q 	tc_check_packets "dev $h1 ingress" 101 1	check_err $? "Did not match on filter with loopback" 	ethtool -K $h1 loopback off	check_err $? "Failed to disable loopback" 	$MZ $h1 -c 1 -t arp -q 	tc_check_packets "dev $h1 ingress" 101 2	check_fail $? "Matched on a filter after loopback was removed" 	tc filter del dev $h1 ingress protocol arp pref 1 handle 101 flower 	log_test "loopback"} setup_prepare(){	h1=${NETIFS[p1]}	h2=${NETIFS[p2]} 	vrf_prepare 	h1_create	h2_create 	if ethtool -k $h1 | grep loopback | grep -q fixed; then		log_test "SKIP: dev $h1 does not support loopback feature"		exit $ksft_skip	fi} cleanup(){	pre_cleanup 	h2_destroy	h1_destroy 	vrf_cleanup} trap cleanup EXIT setup_preparesetup_wait tests_run exit $EXIT_STATUS