Re: [PATCH v6 02/15] net: generalise net_iov chunk owners

[Christoph Hellwig <hch@infradead.org>]

On Tue, Oct 29, 2024 at 04:35:16PM +0000, Pavel Begunkov wrote:
> I see, the reply is about your phrase about additional memory
> abstractions:
> 
> "... don't really need to build memory buffer abstraction over
> memory buffer abstraction."

Yes, over the exsting memory buffer abstraction (dma_buf).

> If you mean internals, making up a dmabuf that has never existed in the
> picture in the first place is not cleaner or easier in any way. If that
> changes, e.g. there is more code to reuse in the future, we can unify it
> then.

I'm not sure what "making up" means here, they are all made up :)

> > with pre-registering the memry with the iommu to get good performance
> > in IOMMU-enabled setups.
> 
> The page pool already does that just like it handles the normal
> path without providers.

In which case is basically is a dma-buf.  If you'd expose it as such
we could actually use to communicate between subsystems in the
kernel.