linux-kernel - Re: [RFC PATCH net-next v8 02/14] net: page_pool: create hooks for custom page providers

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Message-ID: <20240507161857.GA4718@ziepe.ca>
Date: Tue, 7 May 2024 13:18:57 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>,
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Subject: Re: [RFC PATCH net-next v8 02/14] net: page_pool: create hooks for
 custom page providers

On Tue, May 07, 2024 at 05:05:12PM +0100, Pavel Begunkov wrote:
> > even in tree if you give them enough rope, and they should not have
> > that rope when the only sensible options are page/folio based kernel
> > memory (incuding large/huge folios) and dmabuf.
> 
> I believe there is at least one deep confusion here, considering you
> previously mentioned Keith's pre-mapping patches. The "hooks" are not
> that about in what format you pass memory, it's arguably the least
> interesting part for page pool, more or less it'd circulate whatever
> is given. It's more of how to have a better control over buffer lifetime
> and implement a buffer pool passing data to users and empty buffers
> back.

Isn't that more or less exactly what dmabuf is? Why do you need
another almost dma-buf thing for another project?

Jason