linux-kernel - Re: [net-next PATCH 00/27] Add support for DMA writable pages being writable by the network stack

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Message-ID: <20161026174542.334798db@redhat.com>
Date:   Wed, 26 Oct 2016 17:45:42 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Alexander Duyck <alexander.h.duyck@...el.com>
Cc:     netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        davem@...emloft.net, brouer@...hat.com
Subject: Re: [net-next PATCH 00/27] Add support for DMA writable pages being
 writable by the network stack

On Tue, 25 Oct 2016 11:36:48 -0400
Alexander Duyck <alexander.h.duyck@...el.com> wrote:

> The first 22 patches in the set add support for the DMA attribute
> DMA_ATTR_SKIP_CPU_SYNC on multiple platforms/architectures.  This is needed
> so that we can flag the calls to dma_map/unmap_page so that we do not
> invalidate cache lines that do not currently belong to the device.  Instead
> we have to take care of this in the driver via a call to
> sync_single_range_for_cpu prior to freeing the Rx page.
> 
> Patch 23 adds support for dma_map_page_attrs and dma_unmap_page_attrs so
> that we can unmap and map a page using the DMA_ATTR_SKIP_CPU_SYNC
> attribute.
> 
> Patch 24 adds support for freeing a page that has multiple references being
> held by a single caller.  This way we can free page fragments that were
> allocated by a given driver.
> 
> The last 3 patches use these updates in the igb driver to allow for us to
> reimpelement the use of build_skb.
> 
> My hope is to get the series accepted into the net-next tree as I have a
> number of other Intel drivers I could then begin updating once these
> patches are accepted.
> 
> v1: Split out changes DMA_ERROR_CODE fix for swiotlb-xen
>     Minor fixes based on issues found by kernel build bot
>     Few minor changes for issues found on code review
>     Added Acked-by for patches that were acked and not changed

I really appreciate you are doing this work Alex, thanks! And I do
think it fits into my page pool plans. Thanks!

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer