selftests: forwarding: Add a forwarding test for pedit munge dsfield

Add a test that runs packets with dsfield set, and test that pedit adjusts
the DSCP or ECN parts or the whole field.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# This test sends traffic from H1 to H2. Either on ingress of $swp1, or on
+# egress of $swp2, the traffic is acted upon by a pedit action. An ingress
+# filter installed on $h2 verifies that the packet looks like expected.
+#
+# +----------------------+                             +----------------------+
+# | H1                   |                             |                   H2 |
+# |    + $h1             |                             |            $h2 +     |
+# |    | 192.0.2.1/28    |                             |   192.0.2.2/28 |     |
+# +----|-----------------+                             +----------------|-----+
+#      |                                                                |
+# +----|----------------------------------------------------------------|-----+
+# | SW |                                                                |     |
+# |  +-|----------------------------------------------------------------|-+   |
+# |  | + $swp1                       BR                           $swp2 + |   |
+# |  +--------------------------------------------------------------------+   |
+# +---------------------------------------------------------------------------+
+
+ALL_TESTS="
+	ping_ipv4
+	test_ip_dsfield
+	test_ip_dscp
+	test_ip_ecn
+	test_ip_dscp_ecn
+"
+
+NUM_NETIFS=4
+source lib.sh
+source tc_common.sh
+
+: ${HIT_TIMEOUT:=2000} # ms
+
+h1_create()
+{
+	simple_if_init $h1 192.0.2.1/28 2001:db8:1::1/64
+}
+
+h1_destroy()
+{
+	simple_if_fini $h1 192.0.2.1/28 2001:db8:1::1/64
+}
+
+h2_create()
+{
+	simple_if_init $h2 192.0.2.2/28 2001:db8:1::2/64
+	tc qdisc add dev $h2 clsact
+}
+
+h2_destroy()
+{
+	tc qdisc del dev $h2 clsact
+	simple_if_fini $h2 192.0.2.2/28 2001:db8:1::2/64
+}
+
+switch_create()
+{
+	ip link add name br1 up type bridge vlan_filtering 1
+	ip link set dev $swp1 master br1
+	ip link set dev $swp1 up
+	ip link set dev $swp2 master br1
+	ip link set dev $swp2 up
+
+	tc qdisc add dev $swp1 clsact
+	tc qdisc add dev $swp2 clsact
+}
+
+switch_destroy()
+{
+	tc qdisc del dev $swp2 clsact
+	tc qdisc del dev $swp1 clsact
+
+	ip link set dev $swp2 nomaster
+	ip link set dev $swp1 nomaster
+	ip link del dev br1
+}
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	swp1=${NETIFS[p2]}
+
+	swp2=${NETIFS[p3]}
+	h2=${NETIFS[p4]}
+
+	h2mac=$(mac_get $h2)
+
+	vrf_prepare
+	h1_create
+	h2_create
+	switch_create
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	switch_destroy
+	h2_destroy
+	h1_destroy
+	vrf_cleanup
+}
+
+ping_ipv4()
+{
+	ping_test $h1 192.0.2.2
+}
+
+do_test_pedit_dsfield_common()
+{
+	local pedit_locus=$1; shift
+	local pedit_action=$1; shift
+	local mz_flags=$1; shift
+
+	RET=0
+
+	# TOS 125: DSCP 31, ECN 1. Used for testing that the relevant part is
+	# overwritten when zero is selected.
+	$MZ $mz_flags $h1 -c 10 -d 20msec -p 100 \
+	    -a own -b $h2mac -q -t tcp tos=0x7d,sp=54321,dp=12345
+
+	local pkts
+	pkts=$(busywait "$TC_HIT_TIMEOUT" until_counter_is ">= 10" \
+			tc_rule_handle_stats_get "dev $h2 ingress" 101)
+	check_err $? "Expected to get 10 packets, but got $pkts."
+	log_test "$pedit_locus pedit $pedit_action"
+}
+
+do_test_pedit_dsfield()
+{
+	local pedit_locus=$1; shift
+	local pedit_action=$1; shift
+	local match_prot=$1; shift
+	local match_flower=$1; shift
+	local mz_flags=$1; shift
+	local saddr=$1; shift
+	local daddr=$1; shift
+
+	tc filter add $pedit_locus handle 101 pref 1 \
+	   flower action pedit ex munge $pedit_action
+	tc filter add dev $h2 ingress handle 101 pref 1 prot $match_prot \
+	   flower skip_hw $match_flower action pass
+
+	do_test_pedit_dsfield_common "$pedit_locus" "$pedit_action" "$mz_flags"
+
+	tc filter del dev $h2 ingress pref 1
+	tc filter del $pedit_locus pref 1
+}
+
+do_test_ip_dsfield()
+{
+	local locus=$1; shift
+	local dsfield
+
+	for dsfield in 0 1 2 3 128 252 253 254 255; do
+		do_test_pedit_dsfield "$locus"				\
+				      "ip dsfield set $dsfield"		\
+				      ip "ip_tos $dsfield"		\
+				      "-A 192.0.2.1 -B 192.0.2.2"
+	done
+}
+
+test_ip_dsfield()
+{
+	do_test_ip_dsfield "dev $swp1 ingress"
+	do_test_ip_dsfield "dev $swp2 egress"
+}
+
+do_test_ip_dscp()
+{
+	local locus=$1; shift
+	local dscp
+
+	for dscp in 0 1 2 3 32 61 62 63; do
+		do_test_pedit_dsfield "$locus"				       \
+				  "ip dsfield set $((dscp << 2)) retain 0xfc"  \
+				  ip "ip_tos $(((dscp << 2) | 1))"	       \
+				  "-A 192.0.2.1 -B 192.0.2.2"
+	done
+}
+
+test_ip_dscp()
+{
+	do_test_ip_dscp "dev $swp1 ingress"
+	do_test_ip_dscp "dev $swp2 egress"
+}
+
+do_test_ip_ecn()
+{
+	local locus=$1; shift
+	local ecn
+
+	for ecn in 0 1 2 3; do
+		do_test_pedit_dsfield "$locus"				\
+				      "ip dsfield set $ecn retain 0x03"	\
+				      ip "ip_tos $((124 | $ecn))"	\
+				      "-A 192.0.2.1 -B 192.0.2.2"
+	done
+}
+
+test_ip_ecn()
+{
+	do_test_ip_ecn "dev $swp1 ingress"
+	do_test_ip_ecn "dev $swp2 egress"
+}
+
+do_test_ip_dscp_ecn()
+{
+	local locus=$1; shift
+
+	tc filter add $locus handle 101 pref 1				\
+	   flower action pedit ex munge ip dsfield set 124 retain 0xfc	\
+		  action pedit ex munge ip dsfield set 1 retain 0x03
+	tc filter add dev $h2 ingress handle 101 pref 1 prot ip		\
+	   flower skip_hw ip_tos 125 action pass
+
+	do_test_pedit_dsfield_common "$locus" "set DSCP + set ECN"	\
+				      "-A 192.0.2.1 -B 192.0.2.2"
+
+	tc filter del dev $h2 ingress pref 1
+	tc filter del $locus pref 1
+}
+
+test_ip_dscp_ecn()
+{
+	do_test_ip_dscp_ecn "dev $swp1 ingress"
+	do_test_ip_dscp_ecn "dev $swp2 egress"
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS