This patch adds a selftest for userpsace PM to remove id 0 subflow and
id 0 address.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index ee1f89a872b3..9bcfacaa4124 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -3434,6 +3434,30 @@ userspace_tests()
 		kill_events_pids
 		wait $tests_pid
 	fi
+
+	# userspace pm remove id 0 subflow & address
+	if reset_with_events "userspace pm remove id 0 subflow & address" &&
+	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
+		local tk
+
+		set_userspace_pm $ns2
+		pm_nl_set_limits $ns1 0 2
+		speed=10 \
+			run_tests $ns1 $ns2 10.0.1.1 &
+		local tests_pid=$!
+		wait_mpj $ns2
+		userspace_pm_add_sf 10.0.1.2 0
+		userspace_pm_add_sf 10.0.3.2 20
+		chk_join_nr 2 2 2
+		chk_mptcp_info subflows 2 subflows 2
+		tk=$(sed -n 's/.*\(token:\)\([[:digit:]]*\).*$/\2/p;q' "$evts_ns2")
+		ip netns exec $ns2 ./pm_nl_ctl rem token $tk id 0
+		ip netns exec $ns2 ./pm_nl_ctl dsf token $tk id 0
+		chk_rm_nr 2 2
+		chk_mptcp_info subflows 1 subflows 1
+		kill_events_pids
+		wait $tests_pid
+	fi
 }
 
 endpoint_tests()
-- 
2.35.3