I have a device using a KSZ9897 switch (CONFIG_MICROCHIP_KSZ_SPI_DRIVER=y) using a 4.19.9 kernel, where I am trying to enable a bridge on some of the ports using systemd-networkd. However, it seems to be getting an error when it tries to configure the ports to be part of the bridge. systemd-networkd complains with:
lan1: Set link lan1: Could not join netdev: Operation not supported lan1: Failed and the kernel complains: lan: bridge flag offload is not supported 4(lan1) That message is coming from br_switchdev_set_port_flag in net/bridge/br_switchdev.c. Adding some more output to that statement tells me: lan: bridge flag offload is not supported, flags 18656 mask 64 support 0, 4(lan1) which appears to mean something is trying to enable BR_BCAST_FLOOD, BR_MCAST_FLOOD, BR_PROMISC, BR_FLOOD, BR_LEARNING on the port, but it is failing to enable BR_FLOOD because brport_flags_support is 0. I am just using the default bridge settings in systemd-networkd, so that is nothing that I am specifying explicitly. However, if I look at brctl, it appears that the devices have in fact been added to the bridge, but obviously systemd-networkd still treats this as a failure. I'm not sure what that means.. is this a kernel problem? systemd-networkd problem? Are we somehow trying to do something unsupported on this hardware? Any advice would be appreciated. -- Robert Hancock Senior Software Developer SED Systems Email: hanc...@sedsystems.ca
