selftests: mlxsw: extack: Test creation of multiple VLAN-aware bridges

The driver supports a single VLAN-aware bridge. Test that the
enslavement of a port to the second VLAN-aware bridge fails with an
extack.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/mlxsw/extack.sh

@@ -9,6 +9,7 @@ ALL_TESTS="
 	netdev_pre_up_test
 	vxlan_vlan_add_test
 	vxlan_bridge_create_test
+	bridge_create_test
 "
 NUM_NETIFS=2
 source $lib_dir/lib.sh
@@ -137,6 +138,28 @@ vxlan_bridge_create_test()
 	ip link del dev vx1
 }
 
+bridge_create_test()
+{
+	RET=0
+
+	ip link add name br1 up type bridge vlan_filtering 1
+	ip link add name br2 up type bridge vlan_filtering 1
+
+	ip link set dev $swp1 master br1
+	check_err $?
+
+	# Only one VLAN-aware bridge is supported, so this should fail with
+	# an extack.
+	ip link set dev $swp2 master br2 2>&1 > /dev/null \
+		| grep -q mlxsw_spectrum
+	check_err $?
+
+	log_test "extack - multiple VLAN-aware bridges creation"
+
+	ip link del dev br2
+	ip link del dev br1
+}
+
 trap cleanup EXIT
 
 setup_prepare