On Fri, 2019-04-26 at 09:00 -0600, David Ahern wrote: > > What is a valid use case for an attribute sometimes being a nest and > sometimes not? That seems really weird to me (ie., wrong). They should > be 2 separate attributes even if the backend processing is the same. Yeah, well, in the mentioned case - NL80211_ATTR_VENDOR_DATA - we basically have something that each driver (sometimes each operation that uses it) decides what it means, and most drivers like proper netlink attributes so have nested stuff there. Sometimes not, though in Prague we decided we should make that documented by requiring a nested policy and (perhaps, TBD) using something like an ERR_PTR() for "I really want this to be binary". I think as far as this particular attribute is concerned the ship has sailed, but in the future I'd probably advocate having two attributes. johannes