Re: [Qemu-devel] [RFC] QOMification of AXI stream

[Paul Brook <paul@codesourcery.com>]

> >> So what im proposing is AXI stream is implemented as a unidirectional
> >> point to point bus. The xilinx ethernet system would consist of two of
> >> these buses one for tx, one for rx.
> > 
> > I thought the idea was that with QOM the bus/device model would go away.
> > The DMA controller implements an AXIDMA interface, and the device has a
> > AXIDMA link that's connected to that interface.
> > 
> > Of course we then hit the usual problem with QOM that we can only link to
> > objects, and it's impossible to expose multiple interfaces of the same
> > type.
> 
> No, QOM supports multiple inheritance of interfaces so you absolutely can
> inherit from multiple different interfaces.

But you can't have multiple instances of the same interface.  And the 
interfaces must be stateless.  Hence you need the proxy object.

Paul