selftests: mirror_gre_bridge_1q: Avoid changing PVID while interface is operational

In emulated environments, the bridge ports enslaved to br1 get a carrier
before changing br1's PVID. This means that by the time the PVID is
changed, br1 is already operational and configured with an IPv6
link-local address.

When the test is run with netdevs registered by mlxsw, changing the PVID
is vetoed, as changing the VID associated with an existing L3 interface
is forbidden. This restriction is similar to the 8021q driver's
restriction of changing the VID of an existing interface.

Fix this by taking br1 down and bringing it back up when it is fully
configured.

With this fix, the test reliably passes on top of both the SW and HW
data paths (emulated or not).

Fixes: 160e77d06cd3 ("selftests: forwarding: Test mirror-to-gretap w/ UL 802.1q")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/20220502084507.364774-1-idosch@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/tools/testing/selftests/net/forwarding/mirror_gre_bridge_1q.sh b/tools/testing/selftests/net/forwarding/mirror_gre_bridge_1q.sh
index a3402cd8d5b68d6445ce078651f0f4884ed69d72..9ff22f28032ddd8b2786f319e3638f000f42da4a 100755 (executable)
--- a/tools/testing/selftests/net/forwarding/mirror_gre_bridge_1q.sh
+++ b/tools/testing/selftests/net/forwarding/mirror_gre_bridge_1q.sh
@@ -61,9 +61,12 @@ setup_prepare()
 
        vrf_prepare
        mirror_gre_topo_create
+       # Avoid changing br1's PVID while it is operational as a L3 interface.
+       ip link set dev br1 down
 
        ip link set dev $swp3 master br1
        bridge vlan add dev br1 vid 555 pvid untagged self
+       ip link set dev br1 up
        ip address add dev br1 192.0.2.129/28
        ip address add dev br1 2001:db8:2::1/64