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

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Message-ID: <ZxijxiqNGONin3IY@infradead.org>
Date: Wed, 23 Oct 2024 00:20:38 -0700
From: Christoph Hellwig <hch@...radead.org>
To: David Wei <dw@...idwei.uk>
Cc: io-uring@...r.kernel.org, netdev@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>,
	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 Wed, Oct 16, 2024 at 11:52:39AM -0700, David Wei wrote:
> From: Pavel Begunkov <asml.silence@...il.com>
> 
> Currently net_iov stores a pointer to struct dmabuf_genpool_chunk_owner,
> which serves as a useful abstraction to share data and provide a
> context. However, it's too devmem specific, and we want to reuse it for
> other memory providers, and for that we need to decouple net_iov from
> devmem. Make net_iov to point to a new base structure called
> net_iov_area, which dmabuf_genpool_chunk_owner extends.

We've been there before.  Instead of reinventing your own memory
provider please enhance dmabufs for your use case.  We don't really
need to build memory buffer abstraction over memory buffer abstraction.