[PATCH v3] bus/cdx: provide driver flag for optional resource mapping

[Gangurde, Abhijit]

> > > > +/**
> > > > + * Map the CDX device resources in user space virtual memory address.
> > > > + *
> > > > + * Note that driver should not call this function when flag
> > > > + * RTE_CDX_DRV_NEED_MAPPING is set, as EAL will do that for
> > > > + * you when it's on.
> > >
> > > Why should we export this function in the application ABI, if it is
> > > only used by drivers?
> >
> > This can be called from an application as well if this flag is not set hence, we
> need to export this function.
> 
> What kind of applications / in which usecase, one would need to map
> the device resources?
> Except a driver?

I understand that it is probably not the ideal use case, but some of the customers
are using a single application which also registers itself as driver. Probably such
applications need to use internal APIs instead of making these APIs external.
Will analyze it further and send another rev of this patch.

Thanks,
Abhijit