netdev - [PATCH net-next v2 2/2] selftests: fib_tests: Add a test case for IPv6 garbage collection

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Message-Id: <20230718180321.294721-3-kuifeng@meta.com>
Date: Tue, 18 Jul 2023 11:03:21 -0700
From: Kui-Feng Lee <thinker.li@...il.com>
To: dsahern@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	martin.lau@...ux.dev,
	kernel-team@...a.com,
	yhs@...a.com
Cc: Kui-Feng Lee <kuifeng@...a.com>
Subject: [PATCH net-next v2 2/2] selftests: fib_tests: Add a test case for IPv6 garbage collection

Add 10 IPv6 routes with expiration time.  Wait for a few seconds
to make sure they are removed correctly.

Signed-off-by: Kui-Feng Lee <kuifeng@...a.com>
---
 tools/testing/selftests/net/fib_tests.sh | 49 +++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh
index 35d89dfa6f11..55bc6897513a 100755
--- a/tools/testing/selftests/net/fib_tests.sh
+++ b/tools/testing/selftests/net/fib_tests.sh
@@ -9,7 +9,7 @@ ret=0
 ksft_skip=4
 
 # all tests in this script. Can be overridden with -t option
-TESTS="unregister down carrier nexthop suppress ipv6_notify ipv4_notify ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics ipv4_route_metrics ipv4_route_v6_gw rp_filter ipv4_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh"
+TESTS="unregister down carrier nexthop suppress ipv6_notify ipv4_notify ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics ipv4_route_metrics ipv4_route_v6_gw rp_filter ipv4_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh fib6_gc_test"
 
 VERBOSE=0
 PAUSE_ON_FAIL=no
@@ -747,6 +747,52 @@ fib_notify_test()
 	cleanup &> /dev/null
 }
 
+fib6_gc_test()
+{
+	setup
+
+	echo
+	echo "Fib6 garbage collection test"
+	set -e
+
+	OLD_INTERVAL=$(sysctl -n net.ipv6.route.gc_interval)
+	# Check expiration of routes every 3 seconds (GC)
+	$NS_EXEC sysctl -wq net.ipv6.route.gc_interval=3
+
+	$IP link add dummy_10 type dummy
+	$IP link set dev dummy_10 up
+	$IP -6 address add 2001:10::1/64 dev dummy_10
+
+	for i in 0 1 2 3 4 5 6 7 8 9; do
+	    # Expire route after 2 seconds
+	    $IP -6 route add 2001:20::1$i \
+		via 2001:10::2 dev dummy_10 expires 2
+	done
+	N_EXP=$($IP -6 route list |grep expires|wc -l)
+	if [ $N_EXP -ne 10 ]; then
+		echo "FAIL: expected 10 routes with expires, got $N_EXP"
+		ret=1
+	else
+	    sleep 4
+	    N_EXP_s20=$($IP -6 route list |grep expires|wc -l)
+
+	    if [ $N_EXP_s20 -ne 0 ]; then
+		echo "FAIL: expected 0 routes with expires, got $N_EXP_s20"
+		ret=1
+	    else
+		ret=0
+	    fi
+	fi
+
+	set +e
+
+	log_test $ret 0 "ipv6 route garbage collection"
+
+	sysctl -wq net.ipv6.route.gc_interval=$OLD_INTERVAL
+
+	cleanup &> /dev/null
+}
+
 fib_suppress_test()
 {
 	echo
@@ -2217,6 +2263,7 @@ do
 	ipv4_mangle)			ipv4_mangle_test;;
 	ipv6_mangle)			ipv6_mangle_test;;
 	ipv4_bcast_neigh)		ipv4_bcast_neigh_test;;
+	fib6_gc_test|ipv6_gc)		fib6_gc_test;;
 
 	help) echo "Test names: $TESTS"; exit 0;;
 	esac
-- 
2.34.1