selftests: mptcp: iperf mptcp tests

MPTCPv1 protocol support has been added in iperf3 recently. This patch
add some tests for iperf3 to demonstrate the advantages of MPTCP over
TCP in latency or packet loss situations.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>

1 files changed, 252 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/mptcp/iperf_test.sh b/tools/testing/selftests/net/mptcp/iperf_test.sh
new file mode 100755
index 00000000000000..b89d1745575130
--- /dev/null
+++ b/tools/testing/selftests/net/mptcp/iperf_test.sh
@@ -0,0 +1,252 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# shellcheck disable=SC2086
+
+. "$(dirname "${0}")/mptcp_lib.sh"
+
+init=0
+declare -A failed_tests
+MPTCP_LIB_TEST_FORMAT="%02u %s\n"
+TEST_NAME=""
+ns1=""
+ns2=""
+last_test_failed=0
+last_test_skipped=0
+last_test_ignored=1
+
+cleanup()
+{
+	mptcp_lib_ns_exit "${ns1}" "${ns2}"
+}
+
+init()
+{
+	init=1
+
+	mptcp_lib_check_mptcp
+	mptcp_lib_check_tools ip tc iperf
+
+	trap cleanup EXIT
+}
+
+init_partial()
+{
+	mptcp_lib_ns_init ns1 ns2
+
+	local netns
+	for netns in "$ns1" "$ns2"; do
+		ip netns exec $netns sysctl -q net.mptcp.pm_type=0 2>/dev/null || true
+	done
+
+	#  ns1         ns2
+	# ns1eth1    ns2eth1
+	# ns1eth2    ns2eth2
+	# ns1eth3    ns2eth3
+	# ns1eth4    ns2eth4
+
+	local i
+	for i in $(seq 1 4); do
+		ip link add ns1eth$i netns "$ns1" type veth peer name ns2eth$i netns "$ns2"
+		ip -net "$ns1" addr add 10.0.$i.1/24 dev ns1eth$i
+		ip -net "$ns1" addr add dead:beef:$i::1/64 dev ns1eth$i nodad
+		ip -net "$ns1" link set ns1eth$i up
+
+		ip -net "$ns2" addr add 10.0.$i.2/24 dev ns2eth$i
+		ip -net "$ns2" addr add dead:beef:$i::2/64 dev ns2eth$i nodad
+		ip -net "$ns2" link set ns2eth$i up
+
+		# let $ns2 reach any $ns1 address from any interface
+		ip -net "$ns2" route add default via 10.0.$i.1 dev ns2eth$i metric 10$i
+		ip -net "$ns2" route add default via dead:beef:$i::1 dev ns2eth$i metric 10$i
+	done
+}
+
+append_prev_results()
+{
+	if [ ${last_test_failed} -eq 1 ]; then
+		mptcp_lib_result_fail "${TEST_NAME}"
+	elif [ ${last_test_skipped} -eq 1 ]; then
+		mptcp_lib_result_skip "${TEST_NAME}"
+	elif [ ${last_test_ignored} -ne 1 ]; then
+		mptcp_lib_result_pass "${TEST_NAME}"
+	fi
+
+	last_test_failed=0
+	last_test_skipped=0
+	last_test_ignored=0
+}
+
+# $1: test name
+reset()
+{
+	append_prev_results
+	TEST_NAME="${1}"
+
+	mptcp_lib_print_title "${TEST_NAME}"
+
+	if [ "${init}" != "1" ]; then
+		init
+	else
+		cleanup
+	fi
+
+	init_partial
+
+	return 0
+}
+
+print_check()
+{
+	printf "%-50s" "${*}"
+}
+
+dump_stats()
+{
+	echo Server ns stats
+	ip netns exec $ns1 nstat -as | grep Tcp
+	echo Client ns stats
+	ip netns exec $ns2 nstat -as | grep Tcp
+}
+
+# $1: err msg
+fail_test()
+{
+	ret=${KSFT_FAIL}
+
+	mptcp_lib_pr_fail "${@}"
+
+	# just in case a test is marked twice as failed
+	if [ ${last_test_failed} -eq 0 ]; then
+		# shellcheck disable=SC2034
+		failed_tests[${MPTCP_LIB_TEST_COUNTER}]="${TEST_NAME}"
+		dump_stats
+		last_test_failed=1
+	fi
+}
+
+chk_join_nr()
+{
+	local syn_nr=$1
+	local syn_ack_nr=$2
+	local ack_nr=$3
+	local count
+
+	print_check "syn"
+	count=$(mptcp_lib_get_counter ${ns1} "MPTcpExtMPJoinSynRx")
+	if [ -z "$count" ]; then
+		mptcp_lib_pr_skip
+	elif [ "$count" != "$syn_nr" ]; then
+		fail_test "got $count JOIN[s] syn expected $syn_nr"
+	else
+		mptcp_lib_pr_ok
+	fi
+
+	print_check "synack"
+	count=$(mptcp_lib_get_counter ${ns2} "MPTcpExtMPJoinSynAckRx")
+	if [ -z "$count" ]; then
+		mptcp_lib_pr_skip
+	elif [ "$count" != "$syn_ack_nr" ]; then
+		fail_test "got $count JOIN[s] synack expected $syn_ack_nr"
+	else
+		mptcp_lib_pr_ok
+	fi
+
+	print_check "ack"
+	count=$(mptcp_lib_get_counter ${ns1} "MPTcpExtMPJoinAckRx")
+	if [ -z "$count" ]; then
+		mptcp_lib_pr_skip
+	elif [ "$count" != "$ack_nr" ]; then
+		fail_test "got $count JOIN[s] ack expected $ack_nr"
+	else
+		mptcp_lib_pr_ok
+	fi
+}
+
+iperf_tests()
+{
+	if reset "iperf tcp test, rate 100mbit"; then
+		tc -n $ns2 qdisc add dev ns2eth1 root netem rate 100mbit
+		tc -n $ns2 qdisc add dev ns2eth2 root netem rate 100mbit
+		tc -n $ns2 qdisc add dev ns2eth3 root netem rate 100mbit
+		tc -n $ns2 qdisc add dev ns2eth4 root netem rate 100mbit
+		ip netns exec $ns1 iperf3 -s &
+		local tests_pid=$!
+		sleep 1
+		ip netns exec $ns2 iperf3 -c 10.0.1.1
+		mptcp_lib_kill_wait $tests_pid
+		chk_join_nr 0 0 0
+	fi
+
+	if reset "iperf mptcp test, rate 100mbit"; then
+		tc -n $ns2 qdisc add dev ns2eth1 root netem rate 100mbit
+		tc -n $ns2 qdisc add dev ns2eth2 root netem rate 100mbit
+		tc -n $ns2 qdisc add dev ns2eth3 root netem rate 100mbit
+		tc -n $ns2 qdisc add dev ns2eth4 root netem rate 100mbit
+		mptcp_lib_pm_nl_set_limits $ns1 8 8
+		mptcp_lib_pm_nl_set_limits $ns2 8 8
+		mptcp_lib_pm_nl_add_endpoint $ns2 10.0.2.2 dev ns2eth2 flags subflow
+		mptcp_lib_pm_nl_add_endpoint $ns2 10.0.3.2 dev ns2eth3 flags subflow
+		mptcp_lib_pm_nl_add_endpoint $ns2 10.0.4.2 dev ns2eth4 flags subflow
+		ip netns exec $ns1 iperf3 -m -s &
+		local tests_pid=$!
+		sleep 1
+		ip netns exec $ns2 iperf3 -m -c 10.0.1.1
+		mptcp_lib_kill_wait $tests_pid
+		chk_join_nr 3 3 3
+	fi
+
+	if reset "iperf tcp test, delay 1ms"; then
+		tc -n $ns2 qdisc add dev ns2eth1 root netem rate 1mbit delay 1ms
+		ip netns exec $ns1 iperf3 -s &
+		local tests_pid=$!
+		sleep 1
+		ip netns exec $ns2 iperf3 -c 10.0.1.1
+		mptcp_lib_kill_wait $tests_pid
+		chk_join_nr 0 0 0
+	fi
+
+	if reset "iperf mptcp test, delay 1ms"; then
+		tc -n $ns2 qdisc add dev ns2eth1 root netem rate 1mbit delay 1ms
+		mptcp_lib_pm_nl_set_limits $ns1 8 8
+		mptcp_lib_pm_nl_set_limits $ns2 8 8
+		mptcp_lib_pm_nl_add_endpoint $ns2 10.0.2.2 dev ns2eth2 flags subflow
+		mptcp_lib_pm_nl_add_endpoint $ns2 10.0.3.2 dev ns2eth3 flags subflow
+		ip netns exec $ns1 iperf3 -m -s &
+		local tests_pid=$!
+		sleep 1
+		ip netns exec $ns2 iperf3 -m -c 10.0.1.1
+		mptcp_lib_kill_wait $tests_pid
+		chk_join_nr 2 2 2
+	fi
+
+	if reset "iperf tcp test, loss 1%"; then
+		tc -n $ns2 qdisc add dev ns2eth1 root netem rate 1mbit loss 1%
+		ip netns exec $ns1 iperf3 -s &
+		local tests_pid=$!
+		sleep 1
+		ip netns exec $ns2 iperf3 -c 10.0.1.1
+		mptcp_lib_kill_wait $tests_pid
+		chk_join_nr 0 0 0
+	fi
+
+	if reset "iperf mptcp test, loss %1"; then
+		tc -n $ns2 qdisc add dev ns2eth1 root netem rate 1mbit loss 1%
+		mptcp_lib_pm_nl_set_limits $ns1 8 8
+		mptcp_lib_pm_nl_set_limits $ns2 8 8
+		mptcp_lib_pm_nl_add_endpoint $ns2 10.0.2.2 dev ns2eth2 flags subflow
+		mptcp_lib_pm_nl_add_endpoint $ns2 10.0.3.2 dev ns2eth3 flags subflow
+		ip netns exec $ns1 iperf3 -m -s &
+		local tests_pid=$!
+		sleep 1
+		ip netns exec $ns2 iperf3 -m -c 10.0.1.1
+		mptcp_lib_kill_wait $tests_pid
+		chk_join_nr 2 2 2
+	fi
+}
+
+iperf_tests
+
+append_prev_results
+mptcp_lib_result_print_all_tap
+exit $ret