Jakub Kicinski <kuba@xxxxxxxxxx> writes: > On Fri, 24 Mar 2023 19:19:00 +0000 Donald Hunter wrote: >> +sub-type >> +~~~~~~~~ >> + >> +Attributes can have a ``sub-type`` that is interpreted in a ``type`` >> +specific way. For example, an attribute with ``type: binary`` can have >> +``sub-type: u32`` which says to interpret the binary blob as an array of >> +``u32``. Binary types are described in more detail in >> +:doc:`genetlink-legacy`. > > I think sub-type is only used for arrays? How about: > > Legacy families have special ways of expressing arrays. ``sub-type`` > can be used to define the type of array members in case array members > are not fully defined as attributes (in a bona fide attribute space). > For instance a C array of u32 values can be specified with > ``type: binary`` and ``sub-type: u32``. Binary types and legacy array > formats are described in more detail in :doc:`genetlink-legacy`. I'll use this text verbatim. Thanks.
