netdev - Re: [BUG] MVPP2 driver exploding in presence of a tap interface

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Date:   Tue, 30 Oct 2018 14:55:01 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org,
        netdev <netdev@...r.kernel.org>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Tomasz Nowicki <tn@...ihalf.com>
Subject: Re: [BUG] MVPP2 driver exploding in presence of a tap interface

On 30/10/18 13:00, Thomas Petazzoni wrote:
> Hello Marcin,
> 
> Thanks for the feedback.
> 
> On Tue, 30 Oct 2018 13:37:37 +0100, Marcin Wojtas wrote:
> 
>> You use _really_ archaic firmware, the bug you see is 99% caused by a
>> bug already fixed long time ago (cleanup all PP2 BM pools correctly
>> during exit boot services). Please grab the latest release:
>> https://github.com/MarvellEmbeddedProcessors/edk2-open-platform/wiki/files/flash-image-18.09.4.bin
>> and let know if you observe any further issues with vanilla kernel.
> 
> Even if this was a bug in the UEFI firmware, shouldn't the kernel be
> independent from that, by doing a proper reset/reinit of the HW ?
> 
> I.e, isn't the firmware fix papering over a bug that should be fixed in
> Linux mvpp2 driver anyway ?

Absolutely. Leaving this unpatched in the kernel, with a 100% chance of
memory corruption is just mad.

I'm pretty sure there should be a way to sanely reset the interface
before it starts repainting the memory. And if there is none, we must
find a way to tell the user that the machine is a death trap. Really.

	M.

PS: updating the FW to the version provided by Marcin indeed makes
things much more reliable. Thanks for that.
-- 
Jazz is not dead. It just smells funny...