Current switchdev users implement notifier blocks to filter global netdev events, in order to correctly offload bridging to their hardware ports.
Such code could be replaced with the support of a simple switchdev attribute set when adding/deleting a port to/from a bridge. Also, we can imagine a switch driver or network layer wanting to restrict the number of logical bridges on top of a physical device. That could be done by returning -EOPNOTSUPP when setting such attribute. The first patch adds a new SWITCHDEV_ATTR_ID_PORT_BRIDGE_IF switchdev attribute containing a boolean, set when joining or leaving a bridge. The second patch shows the benefit of supporting such attribute in the DSA layer. Similar change should be doable to other switchdev users, like Rocker. Note: I send this as an RFC since I am not really sure about the attribute flags, and the exact place to set it in del_nbp(). Comments needed :-) Thanks, Vivien Didelot (2): net: bridge: add switchdev attr for port bridging net: dsa: support SWITCHDEV_ATTR_ID_PORT_BRIDGE_IF include/net/switchdev.h | 2 + net/bridge/br_if.c | 27 ++++++++++++ net/dsa/dsa.c | 7 --- net/dsa/dsa_priv.h | 2 - net/dsa/slave.c | 113 +++++++++++++----------------------------------- 5 files changed, 59 insertions(+), 92 deletions(-) -- 2.7.2
