selftests: forwarding: Add test for mirror to gretap

Add a test for basic mirroring to gretap and ip6gretap netdevices.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/forwarding/mirror_gre.sh

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# This test uses standard topology for testing gretap. See
+# mirror_gre_topo_lib.sh for more details.
+#
+# Test for "tc action mirred egress mirror" when the device to mirror to is a
+# gretap or ip6gretap netdevice. Expect that the packets come out encapsulated,
+# and another gretap / ip6gretap netdevice is then capable of decapsulating the
+# traffic. Test that the payload is what is expected (ICMP ping request or
+# reply, depending on test).
+
+NUM_NETIFS=6
+source lib.sh
+source mirror_lib.sh
+source mirror_gre_lib.sh
+source mirror_gre_topo_lib.sh
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	swp1=${NETIFS[p2]}
+
+	swp2=${NETIFS[p3]}
+	h2=${NETIFS[p4]}
+
+	swp3=${NETIFS[p5]}
+	h3=${NETIFS[p6]}
+
+	vrf_prepare
+	mirror_gre_topo_create
+
+	ip address add dev $swp3 192.0.2.129/28
+	ip address add dev $h3 192.0.2.130/28
+
+	ip address add dev $swp3 2001:db8:2::1/64
+	ip address add dev $h3 2001:db8:2::2/64
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	ip address del dev $h3 2001:db8:2::2/64
+	ip address del dev $swp3 2001:db8:2::1/64
+
+	ip address del dev $h3 192.0.2.130/28
+	ip address del dev $swp3 192.0.2.129/28
+
+	mirror_gre_topo_destroy
+	vrf_cleanup
+}
+
+test_span_gre_mac()
+{
+	local tundev=$1; shift
+	local direction=$1; shift
+	local prot=$1; shift
+	local what=$1; shift
+
+	local swp3mac=$(mac_get $swp3)
+	local h3mac=$(mac_get $h3)
+
+	RET=0
+
+	mirror_install $swp1 $direction $tundev "matchall $tcflags"
+	tc qdisc add dev $h3 clsact
+	tc filter add dev $h3 ingress pref 77 prot $prot \
+		flower ip_proto 0x2f src_mac $swp3mac dst_mac $h3mac \
+		action pass
+
+	mirror_test v$h1 192.0.2.1 192.0.2.2 $h3 77 10
+
+	tc filter del dev $h3 ingress pref 77
+	tc qdisc del dev $h3 clsact
+	mirror_uninstall $swp1 $direction
+
+	log_test "$direction $what: envelope MAC ($tcflags)"
+}
+
+test_two_spans()
+{
+	RET=0
+
+	mirror_install $swp1 ingress gt4 "matchall $tcflags"
+	mirror_install $swp1 egress gt6 "matchall $tcflags"
+	quick_test_span_gre_dir gt4 ingress
+	quick_test_span_gre_dir gt6 egress
+
+	mirror_uninstall $swp1 ingress
+	fail_test_span_gre_dir gt4 ingress
+	quick_test_span_gre_dir gt6 egress
+
+	mirror_install $swp1 ingress gt4 "matchall $tcflags"
+	mirror_uninstall $swp1 egress
+	quick_test_span_gre_dir gt4 ingress
+	fail_test_span_gre_dir gt6 egress
+
+	mirror_uninstall $swp1 ingress
+	log_test "two simultaneously configured mirrors ($tcflags)"
+}
+
+test_all()
+{
+	slow_path_trap_install $swp1 ingress
+	slow_path_trap_install $swp1 egress
+
+	full_test_span_gre_dir gt4 ingress 8 0 "mirror to gretap"
+	full_test_span_gre_dir gt6 ingress 8 0 "mirror to ip6gretap"
+	full_test_span_gre_dir gt4 egress 0 8 "mirror to gretap"
+	full_test_span_gre_dir gt6 egress 0 8 "mirror to ip6gretap"
+
+	test_span_gre_mac gt4 ingress ip "mirror to gretap"
+	test_span_gre_mac gt6 ingress ipv6 "mirror to ip6gretap"
+	test_span_gre_mac gt4 egress ip "mirror to gretap"
+	test_span_gre_mac gt6 egress ipv6 "mirror to ip6gretap"
+
+	test_two_spans
+
+	slow_path_trap_uninstall $swp1 egress
+	slow_path_trap_uninstall $swp1 ingress
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tcflags="skip_hw"
+test_all
+
+if ! tc_offload_check; then
+	echo "WARN: Could not test offloaded functionality"
+else
+	tcflags="skip_sw"
+	test_all
+fi
+
+exit $EXIT_STATUS