netdev - Re: [PATCH v6 02/15] net: generalise net

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Message-ID: <ZyJJcfQ-ldDtsfLN@infradead.org>
Date: Wed, 30 Oct 2024 07:57:53 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>, David Wei <dw@...idwei.uk>,
	io-uring@...r.kernel.org, netdev@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	David Ahern <dsahern@...nel.org>,
	Mina Almasry <almasrymina@...gle.com>,
	Stanislav Fomichev <stfomichev@...il.com>,
	Joe Damato <jdamato@...tly.com>,
	Pedro Tammela <pctammela@...atatu.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v6 02/15] net: generalise net_iov chunk owners

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.