selftests: forwarding: Fix bridge MDB test flakiness

After enabling a multicast querier on the bridge (like the test is
doing), the bridge will wait for the Max Response Delay before starting
to forward according to its MDB in order to let Membership Reports
enough time to be received and processed.

Currently, the test is waiting for exactly the default Max Response
Delay (10 seconds) which is racy and leads to failures [1].

Fix by reducing the Max Response Delay to 1 second.

[1]
 [...]
 # TEST: IPv4 host entries forwarding tests                            [FAIL]
 # Packet locally received after flood

Fixes: b6d00da08610 ("selftests: forwarding: Add bridge MDB test")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://lore.kernel.org/r/20240208155529.1199729-3-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/forwarding/bridge_mdb.sh b/tools/testing/selftests/net/forwarding/bridge_mdb.sh
index 61348f71728cd54537f49e17b192e08514323b4c..f94bfb6f45ecb06016d7069c0fa4eaf946ee963a 100755 (executable)
--- a/tools/testing/selftests/net/forwarding/bridge_mdb.sh
+++ b/tools/testing/selftests/net/forwarding/bridge_mdb.sh
@@ -1252,14 +1252,17 @@ fwd_test()
        echo
        log_info "# Forwarding tests"
 
+       # Set the Max Response Delay to 100 centiseconds (1 second) so that the
+       # bridge will start forwarding according to its MDB soon after a
+       # multicast querier is enabled.
+       ip link set dev br0 type bridge mcast_query_response_interval 100
+
        # Forwarding according to MDB entries only takes place when the bridge
        # detects that there is a valid querier in the network. Set the bridge
        # as the querier and assign it a valid IPv6 link-local address to be
        # used as the source address for MLD queries.
        ip -6 address add fe80::1/64 nodad dev br0
        ip link set dev br0 type bridge mcast_querier 1
-       # Wait the default Query Response Interval (10 seconds) for the bridge
-       # to determine that there are no other queriers in the network.
        sleep 10
 
        fwd_test_host
@@ -1267,6 +1270,7 @@ fwd_test()
 
        ip link set dev br0 type bridge mcast_querier 0
        ip -6 address del fe80::1/64 dev br0
+       ip link set dev br0 type bridge mcast_query_response_interval 1000
 }
 
 ctrl_igmpv3_is_in_test()