linux-kernel - Re: [PATCH net] net: mvneta: fix operation for 64K PAGE

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Date:   Wed, 19 Dec 2018 10:24:37 +0100
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        netdev <netdev@...r.kernel.org>,
        Grégory Clement <gregory.clement@...tlin.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        "nadavh@...vell.com" <nadavh@...vell.com>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Stefan Chulski <stefanc@...vell.com>,
        David Miller <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net] net: mvneta: fix operation for 64K PAGE_SIZE

Hi Jisheng,

śr., 19 gru 2018 o 04:11 Jisheng Zhang <Jisheng.Zhang@...aptics.com> napisał(a):
>
>
> On Mon, 17 Dec 2018 08:37:35 +0100 Thomas Petazzoni wrote:
>
> > Hello Marcin,
> >
> > On Mon, 17 Dec 2018 00:25:58 +0100, Marcin Wojtas wrote:
> >
> > > Thanks. Indeed, the patch is valid as a fix for current version of SW
> > > BM. However, because this concept is broken, I will rework it and
> > > submit patch/patches some time early 2019.
> >
> > I know some people are working on XDP support in mvneta, and this work
> > also needs to change parts of the memory allocation strategy in this
> > driver. I'd suggest to get in touch with those folks. Antoine can give
> > you the contact details, I don't have them off-hand. Or perhaps they
> > will see this e-mail :-)
>
> Great. So the problem of current memory allocation is seen, glad to
> know reworking is going on.
>
> Besides the memory waste, there's another issue with commit 7e47fd84b56b
> it always allocates page, so the rx is mapped with dmap_map_page(), but
> the unmap routine isn't updated, there's mismatch here.
>

Indeed, despite the upcoming rework, which will be more complex, how
about I submit a quick patch for this?

Best regards,
Marcin