Bug#927825: arm: mvneta driver used on Armada XP GP boards does not receive packets (regression from 4.9)

From	Aurelien Jarno <aurel32@debian.org>
Newsgroups	linux.debian.bugs.rc
Subject	Bug#927825: arm: mvneta driver used on Armada XP GP boards does not receive packets (regression from 4.9)
Date	2019-04-25 21:30 +0200
Message-ID	<xQSed-1ye-3@gated-at.bofh.it> (permalink)
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On 2019-04-25 14:50, Aurelien Jarno wrote:
> On 2019-04-23 22:16, Aurelien Jarno wrote:
> > Source: linux
> > Version: 4.19.28-2
> > Severity: important
> > 
> > After upgrading hartmann.debian.org (an armhf buildd using an Armada XP
> > GP board) from buster to stretch, the ethernet device is not working
> 
> More precisely the board is a "Marvell Armada XP Development Board
> DB-MV784MP-GP"
> 
> > anymore. Using tcpdump on both the buildd and a remote host, it appears
> > that the packets correctly leave the board and that the reception side
> > fails.
> > 
> > The module used for the ethernet device is mvneta. The corresponding DT
> > compatible entry is "marvell,armada-xp-neta".
> >
> 
> I have started a "bisection" with the kernels from snapshot. This is
> what I have found so far:
> 
> This one works:
> - linux-image-4.19.0-rc6-armmp-lpae_4.19~rc6-1~exp1_armhf.deb 
> 
> The following ones don't:
> - linux-image-4.19.0-rc7-armmp-lpae_4.19~rc7-1~exp1_armhf.deb
> - linux-image-5.0.0-trunk-armmp_5.0.2-1~exp1_armhf.deb
> 
> My guess (I don't have time to try more now) is that the issue is caused
> by the following change:
> 
> |  [ Uwe Kleine-König ]
> |  * [armhf] enable MVNETA_BM_ENABLE and CAN_FLEXCAN as a module
> 

I confirm this is the issue. Disabling MVNETA_BM_ENABLE on kernel 
4.19.28-2 fixes the issue. Note that it breaks the ABI.

Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net

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Bug#927825: arm: mvneta driver used on Armada XP GP boards does not receive packets (regression from 4.9) Aurelien Jarno <aurel32@debian.org> - 2019-04-25 21:30 +0200
  Bug#927825: arm: mvneta driver used on Armada XP GP boards does not receive packets (regression from 4.9) Aurelien Jarno <aurel32@debian.org> - 2019-05-01 00:10 +0200
  Bug#927825: arm: mvneta driver used on Armada XP GP boards does not receive packets (regression from 4.9) Uwe Kleine-König <uwe@kleine-koenig.org> - 2019-05-02 22:20 +0200

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