[PATCH net-next 2/2] selftests: pmtu: Make list_flush_ipv6_exception test more demanding

[Stefano Brivio <sbrivio@redhat.com>]

Instead of just listing and flushing two cached exceptions, create
a relatively big number of them, and count how many are listed. Single
netlink dump messages contain approximately 25 entries each, and this
way we can make sure the partial dump tracking mechanism is working
properly.

While at it, also ensure that no cached routes can be listed after
flush, and remove 'sleep 1' calls, they are not actually needed.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
 tools/testing/selftests/net/pmtu.sh | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index 6c063b17d7d0..8998a7c03d3e 100755
--- a/tools/testing/selftests/net/pmtu.sh
+++ b/tools/testing/selftests/net/pmtu.sh
@@ -1276,7 +1276,7 @@ test_list_flush_ipv6_exception() {
 	      "${ns_a}"  veth_A-R2    "${ns_r2}" veth_R2-A \
 	      "${ns_r2}" veth_R2-B    "${ns_b}"  veth_B-R2
 
-	dst1="${prefix6}:${b_r1}::1"
+	dst_prefix1="${prefix6}:${b_r1}::"
 	dst2="${prefix6}:${b_r2}::1"
 
 	# Set up initial MTU values
@@ -1292,20 +1292,26 @@ test_list_flush_ipv6_exception() {
 
 	fail=0
 
-	# Create route exceptions
-	run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
-	run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
+	# Add 100 addresses for veth endpoint on B reached by default A route
+	for i in $(seq 100 199); do
+		run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
+	done
 
-	if [ "$(${ns_a} ip -6 route list cache | wc -l)" -ne 2 ]; then
+	# Create 100 cached route exceptions for path via R1, one via R2
+	for i in $(seq 100 199); do
+		run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}"
+	done
+	run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}"
+	if [ "$(${ns_a} ip -6 route list cache | wc -l)" -ne 101 ]; then
 		err "  can't list cached exceptions"
 		fail=1
 	fi
 
 	run_cmd ${ns_a} ip -6 route flush cache
-	sleep 1
-	pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
+	pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")"
 	pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
-	if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ]; then
+	if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
+	   [ -n "$(${ns_a} ip -6 route list cache)" ]; then
 		err "  can't flush cached exceptions"
 		fail=1
 	fi
-- 
2.20.1