selftests: forwarding: mirror_gre_*: Disable IPv6 autogen on bridges

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.

These two selftests however check mirroring traffic to a gretap netdevice.
The bridge here does not participate in routing traffic and the IP address
or the RIF are irrelevant.

Fix by disabling automatic IPv6 address generation for the HW-offloaded
bridges in these selftests, thus exempting them from mlxsw router
attention. Since the bridges are only used for L2 forwarding, this change
should not hinder usefulness of this selftest for testing SW datapath or HW
datapaths in other devices.

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/net/forwarding/mirror_gre_bound.sh b/tools/testing/selftests/net/forwarding/mirror_gre_bound.sh
index 360ca133bead6e6cea2bbdc712e062a391d81c82..6c257ec03756f9f0ab68825d5c64deced515ec5d 100755 (executable)
--- a/tools/testing/selftests/net/forwarding/mirror_gre_bound.sh
+++ b/tools/testing/selftests/net/forwarding/mirror_gre_bound.sh
@@ -98,6 +98,7 @@ switch_create()
        # Bridge between H1 and H2.
 
        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

diff --git a/tools/testing/selftests/net/forwarding/mirror_topo_lib.sh b/tools/testing/selftests/net/forwarding/mirror_topo_lib.sh
index 04979e5962e7f22897fa652207061e0bf58026bf..bb1adbb7b98a4b0b61fd3ef5566ab32d3e3d2980 100644 (file)
--- a/tools/testing/selftests/net/forwarding/mirror_topo_lib.sh
+++ b/tools/testing/selftests/net/forwarding/mirror_topo_lib.sh
@@ -60,6 +60,7 @@ mirror_topo_switch_create()
        ip link set dev $swp3 up
 
        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