netdev - RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool

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Date:   Wed, 24 Jul 2019 09:43:29 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        David Miller <davem@...emloft.net>
CC:     "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "Jose.Abreu@...opsys.com" <Jose.Abreu@...opsys.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

From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Date: Jul/24/2019, 09:54:27 (UTC+00:00)

> Hi David, 
> 
> > From: Jon Hunter <jonathanh@...dia.com>
> > Date: Tue, 23 Jul 2019 13:09:00 +0100
> > 
> > > Setting "iommu.passthrough=1" works for me. However, I am not sure where
> > > to go from here, so any ideas you have would be great.
> > 
> > Then definitely we are accessing outside of a valid IOMMU mapping due
> > to the page pool support changes.
> 
> Yes. On the netsec driver i did test with and without SMMU to make sure i am not
> breaking anything.
> Since we map the whole page on the API i think some offset on the driver causes
> that. In any case i'll have another look on page_pool to make sure we are not
> missing anything. 

Ilias, can it be due to this:

stmmac_main.c:
	pp_params.order = DIV_ROUND_UP(priv->dma_buf_sz, PAGE_SIZE);

page_pool.c:
	dma = dma_map_page_attrs(pool->p.dev, page, 0,
				 (PAGE_SIZE << pool->p.order),
				 pool->p.dma_dir, DMA_ATTR_SKIP_CPU_SYNC);

"order", will be at least 1 and then mapping the page can cause overlap 
?

---
Thanks,
Jose Miguel Abreu