netdev - Re: r8169: IO_PAGE_FAULT & netdev watchdog

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Message-ID: <20120601201357.GA22597@electric-eye.fr.zoreil.com>
Date:	Fri, 1 Jun 2012 22:13:57 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Vincent Pelletier <plr.vincent@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: r8169: IO_PAGE_FAULT & netdev watchdog

Vincent Pelletier <plr.vincent@...il.com> :
[...]
> If it's bogus, could it be a mis-interpretation of its state when the error 
> occurs (I don't know how CPU knows a fault happened, I guess some IRQ + some 
> register contain error status, address of error, some process/context 
> identifier) ?

See "AMD I/O Virtualization Technology (IOMMU) Specification".

> Or hardware bug ? Or MMU misconfiguration for some reason ?

I don't have time to poke deeply enough into the iommu code.

[...]
> If it's not bogus, would it be the sign of firmware bug (accessing some 
> unpredictable memory upon certain conditions) ?

That's what I thought first. Or I should have added something to the r8169
driver. However it's quite reproducible, the failing address is one of the
mapped Rx or Tx descriptor ring address - don't remember which one, see
the PR at korg - and it does not fit the timing pattern.

[...]
> I'll try either and both. Given the poor result I got from 
> reset/remove/rescan, I guess I should reboot between attempts, right ?

Yes. The inlined patch could help avoiding the problem but it is not
supposed to help a failed network adapter recovering.

> Should I prevent original module auto-loading at boot ? Maybe more than just 
> r8169 ?

It should not be required. YMMV.

-- 
Ueimor
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