[RFC PATCH net-next 0/2] net: switchdev: add attribute for port bridging

[Vivien Didelot]

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(-)

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2.7.2