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SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING is notified by the bridge from two places: - nbp_vlan_init(), during bridge port creation - br_vlan_filter_toggle(), during a netlink/sysfs/ioctl change requested by user space If a switchdev driver uses br_vlan_enabled(br_dev) inside its handler for the SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING attribute notifier, different things will be seen depending on whether the bridge calls from the first path or the second: - in nbp_vlan_init(), br_vlan_enabled() reflects the current state of the bridge - in br_vlan_filter_toggle(), br_vlan_enabled() reflects the past state of the bridge This can lead in some cases to complications in driver implementation, which can be avoided if these could reliably use br_vlan_enabled(). Nothing seems to depend on this behavior, and it seems overall more straightforward for br_vlan_enabled() to return the proper value even during the SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING notifier, so temporarily enable the bridge option, then revert it if the switchdev notifier failed. Cc: Roopa Prabhu <roopa@nvidia.com> Cc: Nikolay Aleksandrov <nikolay@nvidia.com> Cc: Ido Schimmel <idosch@nvidia.com> Cc: Jiri Pirko <jiri@nvidia.com> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.