selftests: mlxsw: mirror_gre_scale: Disable IPv6 autogen on a bridge

In a future patch, mlxsw will start adding RIFs to uppers of front panel
port netdevices, if they have an IP address.

At the time that the front panel port is enslaved to the bridge, the bridge
MAC address does not have the same prefix as other interfaces in the
system. On Nvidia Spectrum-1 machines all the RIFs have to have the same
38-bit MAC address prefix. Since the bridge does not obey this limitation,
the RIF cannot be created, and the enslavement attempt is vetoed on the
grounds of the configuration not being offloadable.

The selftest itself however checks how many mirroring sessions a machine is
capable of offloading. The IP address or the RIF are irrelevant.

Fix by disabling automatic IPv6 address generation for the HW-offloaded
bridge in this selftest, thus exempting it from mlxsw router attention.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh b/tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh
index e00435753008a84b378b46559587d3b0f97f5c5f..e5589e2fca85a7624b8a95a89d7a1a67a875a253 100644 (file)
--- a/tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh
@@ -165,6 +165,7 @@ mirror_gre_setup_prepare()
        simple_if_init $h3
 
        ip link add name br1 type bridge vlan_filtering 1
+       ip link set dev br1 addrgenmode none
        ip link set dev br1 up
 
        ip link set dev $swp1 master br1