On Fri, 8 Nov 2024 14:44:37 +0800 Xiao Liang wrote: > > On Fri, 8 Nov 2024 00:53:55 +0800 Xiao Liang wrote: > > > IMO, this is about driver capability, not about user requests. > > > > The bit is a driver capability, that's fine. But the question was how > > to achieve backward compatibility. A flag in user request shifts the > > responsibility of ensuring all services are compatible to whoever > > spawns the interfaces. Which will probably be some network management > > daemon. > > OK. So I think we can change the driver capability indicator in rtnl_ops > to a tristate field, say, "linkns_support". > If it is > - not supported, then keep the old behavior > - supported (vlan, macvlan, etc.), then change to the new behavior > - compat-mode (ip_tunnel), default to old behavior and can be changed > via an IFLA flag. > Is this reasonable? Let's start with annotating the drivers which need the old behavior. It seems like something that was done as a workaround for old drivers, maybe there isn't that many of them and we can convert them all in one series.
