linux-kernel - Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool

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Message-ID: <20190725113922.GA1703@apalos>
Date:   Thu, 25 Jul 2019 14:39:22 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        David Miller <davem@...emloft.net>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "lists@...h.nu" <lists@...h.nu>,
        "Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>,
        "maxime.ripard@...tlin.com" <maxime.ripard@...tlin.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "wens@...e.org" <wens@...e.org>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
 Pool

Hi Jon, Jose,
On Thu, Jul 25, 2019 at 10:45:46AM +0100, Jon Hunter wrote:
> 
> On 25/07/2019 08:44, Jose Abreu wrote:
> 
> ...
> 
> > OK. Can you please test what Ilias mentioned ?
> > 
> > Basically you can hard-code the order to 0 in 
> > alloc_dma_rx_desc_resources():
> > - pp_params.order = DIV_ROUND_UP(priv->dma_buf_sz, PAGE_SIZE);
> > + pp_params.order = 0;
> > 
> > Unless you use a MTU > PAGE_SIZE.
> 
> I made the change but unfortunately the issue persists.

Yea tbh i didn't expect this to fix it, since i think the mappings are fine, but
it never hurts to verify.
@Jose: Can we add some debugging prints on the driver?
Ideally the pages the api allocates (on init), the page that the driver is
trying to use before the crash and the size of the packet (right from the device
descriptor). Maybe this will tell us where the erroneous access is

Thanks
/Ilias