linux-kernel - Re: [PATCH] net: mvpp2: avoid bouncing buffers

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Message-ID: <20190311154655.GB28982@infradead.org>
Date:   Mon, 11 Mar 2019 08:46:55 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Antoine Tenart <antoine.tenart@...tlin.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Brian Brooks <brian.brooks@...aro.org>,
        David Miller <davem@...emloft.net>,
        maxime.chevallier@...tlin.com, ymarkman@...vell.com,
        stefanc@...vell.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bjorn.topel@...el.com,
        brian.brooks@....com
Subject: Re: [PATCH] net: mvpp2: avoid bouncing buffers

On Fri, Mar 01, 2019 at 03:26:02PM +0100, Antoine Tenart wrote:
> Hi Christoph,
> 
> I saw you sent this patch as part of another series back in August, but
> it seems it was never applied and I can't find it even in -next. We made
> some tests and this patch is helping a lot the PPv2 engine driver in
> improving its performances.
> 
> Do you plan on re-sending it, or reworking it? Are there current issues
> with it that prevent it from being merged upstream? Can we help in any
> way?

Hi Antoine,

it's been a while, but my vague memory is that this caused failures
in some ARM setups, and I was tought why for AMBA setting up the
default mask is a bad idea.  I don't really remember more, though.