netdev - Re: [Lsf] [Lsf-pc] [LSF/MM TOPIC] Generic page-pool recycle facility?

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Message-ID: <CAKgT0Uf7qsqYXq=GfCehcEpMRn2t6TyM50h_NFvDQnOoemfsbw@mail.gmail.com>
Date:	Tue, 12 Apr 2016 08:37:54 -0700
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	"lsf@...ts.linux-foundation.org" <lsf@...ts.linux-foundation.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Sagi Grimberg <sagi@...mberg.me>,
	Tom Herbert <tom@...bertland.com>,
	Brenden Blanco <bblanco@...mgrid.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-mm <linux-mm@...ck.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Bart Van Assche <bart.vanassche@...disk.com>,
	"lsf-pc@...ts.linux-foundation.org" 
	<lsf-pc@...ts.linux-foundation.org>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [Lsf] [Lsf-pc] [LSF/MM TOPIC] Generic page-pool recycle facility?

On Mon, Apr 11, 2016 at 11:28 PM, Jesper Dangaard Brouer
<brouer@...hat.com> wrote:
>
> On Mon, 11 Apr 2016 15:02:51 -0700 Alexander Duyck <alexander.duyck@...il.com> wrote:
>
>> Have you taken a look at possibly trying to optimize the DMA pool API
>> to work with pages?  It sounds like it is supposed to do something
>> similar to what you are wanting to do.
>
> Yes, I have looked at the mm/dmapool.c API. AFAIK this is for DMA
> coherent memory (see use of dma_alloc_coherent/dma_free_coherent).
>
> What we are doing is "streaming" DMA memory, when processing the RX
> ring.
>
> (NIC are only using DMA coherent memory for the descriptors, which are
> allocated on driver init)

Yes, I know that but it shouldn't take much to extend the API to
provide the option for a streaming DMA mapping.  That was why I
thought you might want to look in this direction.

- Alex