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All the traffic to/from a DSA master is supposed to be distributed among its DSA switch upper interfaces, so we should not allow other upper device kinds. An exception to this is DSA_TAG_PROTO_NONE (switches with no DSA tags), and in that case it is actually expected to create e.g. VLAN interfaces on the master. But for those, netdev_uses_dsa(master) returns false, so the restriction doesn't apply. The motivation for this change is to allow LAG interfaces of DSA masters to be DSA masters themselves. We want to restrict the user's degrees of freedom by 1: the LAG should already have all DSA masters as lowers, and while lower ports of the LAG can be removed, none can be added after the fact. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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.