selftests: mptcp: flush userspace addrs list

This patch adds a new helper userspace_pm_flush() to flush all addresses
for the userspace PM. Invoke it in userspace pm dump address and subflow
tests. And use dump commands to check if the userspace pm local address
list is empty after addresses flushing.

Signed-off-by: Geliang Tang <[email protected]>

tools/testing/selftests/net/mptcp/mptcp_join.sh

@@ -3385,6 +3385,31 @@ userspace_pm_get_addr()
 	ip netns exec $1 ./pm_nl_ctl get $2 token $tk
 }
 
+# $1: ns ; $2: addr
+userspace_pm_flush()
+{
+	local ns=$1
+	local line
+
+	userspace_pm_dump $ns | while read -r line; do
+		local arr=($line)
+		local nr=0
+		local id
+		local addr
+		local i
+		for i in "${arr[@]}"; do
+			if [ $i = "id" ]; then
+				id=${arr[$nr+1]}
+			fi
+			nr=$((nr + 1))
+		done
+		addr=${arr[$nr-1]}
+		[ $ip_mptcp -eq 1 ] && addr=${arr[0]}
+		userspace_pm_rm_addr $ns $id
+		userspace_pm_rm_sf $ns "$addr" $MPTCP_LIB_SUB_ESTABLISHED
+	done
+}
+
 check_output()
 {
 	local cmd="$1"
@@ -3606,8 +3631,8 @@ userspace_tests()
 		wait $tests_pid
 	fi
 
-	# userspace pm dump address
-	if reset_with_events "userspace pm dump address" &&
+	# userspace pm dump & flush address
+	if reset_with_events "userspace pm dump & flush address" &&
 	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
 		set_userspace_pm $ns1
 		pm_nl_set_limits $ns2 1 1
@@ -3626,12 +3651,18 @@ userspace_tests()
 			     "$dump" "      get id 10 addr"
 		check_output "userspace_pm_dump $ns1" \
 			     "$dump" "      dump addrs signal"
+		userspace_pm_flush $ns1
+		check_output "userspace_pm_dump $ns1" \
+			     "" "      dump addrs after flush"
+		chk_rm_nr 1 1 invert
+		chk_mptcp_info subflows 0 subflows 0
+		chk_subflows_total 1 1
 		kill_events_pids
 		wait $tests_pid
 	fi
 
-	# userspace pm dump subflow
-	if reset_with_events "userspace pm dump subflow" &&
+	# userspace pm dump & flush subflow
+	if reset_with_events "userspace pm dump & flush subflow" &&
 	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
 		set_userspace_pm $ns2
 		pm_nl_set_limits $ns1 0 1
@@ -3650,6 +3681,12 @@ userspace_tests()
 			     "$dump" "      get id 20 addr"
 		check_output "userspace_pm_dump $ns2" \
 			     "$dump" "      dump addrs subflow"
+		userspace_pm_flush $ns2
+		check_output "userspace_pm_dump $ns2" \
+			     "" "      dump addrs after flush"
+		chk_rm_nr 1 1
+		chk_mptcp_info subflows 0 subflows 0
+		chk_subflows_total 1 1
 		kill_events_pids
 		wait $tests_pid
 	fi