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

[Ilias Apalodimas]

Hi David, 

> From: Jon Hunter <jonathanh@xxxxxxxxxx>
> 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. 

> 
> Such a problem should be spotted with swiommu enabled with debugging.

Thanks
/Ilias