netdev - Re: [PATCH net v2 0/4] bonding: properly restore flags when bond changes ether type

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Message-ID: <eeac1baa-f15e-fbb2-4278-f8f4438199bf@redhat.com>
Date:   Tue, 14 Mar 2023 11:15:22 -0400
From:   Jonathan Toppins <jtoppins@...hat.com>
To:     Nikolay Aleksandrov <razor@...ckwall.org>, netdev@...r.kernel.org
Cc:     monis@...taire.com, syoshida@...hat.com, j.vosburgh@...il.com,
        andy@...yhouse.net, kuba@...nel.org, davem@...emloft.net,
        pabeni@...hat.com, edumazet@...gle.com,
        syzbot+9dfc3f3348729cc82277@...kaller.appspotmail.com
Subject: Re: [PATCH net v2 0/4] bonding: properly restore flags when bond
 changes ether type

On 3/14/23 07:14, Nikolay Aleksandrov wrote:
> Hi,
> A bug was reported by syzbot[1] that causes a warning and a myriad of
> other potential issues if a bond, that is also a slave, fails to enslave a
> non-eth device. While fixing that bug I found that we have the same
> issues when such enslave passes and after that the bond changes back to
> ARPHRD_ETHER (again due to ether_setup). This set fixes all issues by
> extracting the ether_setup() sequence in a helper which does the right
> thing about bond flags when it needs to change back to ARPHRD_ETHER. It
> also adds selftests for these cases.
> 
> Patch 01 adds the new bond_ether_setup helper that is used in the
> following patches to fix the bond dev flag issues. Patch 02 fixes the
> issues when a bond device changes its ether type due to successful
> enslave. Patch 03 fixes the issues when it changes its ether type due to
> an unsuccessful enslave. Note we need two patches because the bugs were
> introduced by different commits. Patch 04 adds the new selftests.
> 
> v2: new set, all patches are new due to new approach of fixing these bugs
> 
> Thanks,
>   Nik
> 
> [1] https://syzkaller.appspot.com/bug?id=391c7b1f6522182899efba27d891f1743e8eb3ef
> 
> Nikolay Aleksandrov (4):
>    bonding: add bond_ether_setup helper
>    bonding: restore IFF_MASTER/SLAVE flags on bond enslave ether type
>      change
>    bonding: restore bond's IFF_SLAVE flag if a non-eth dev enslave fails
>    selftests: bonding: add tests for ether type changes
> 
>   drivers/net/bonding/bond_main.c               | 22 +++--
>   .../selftests/drivers/net/bonding/Makefile    |  3 +-
>   .../net/bonding/bond-eth-type-change.sh       | 85 +++++++++++++++++++
>   3 files changed, 102 insertions(+), 8 deletions(-)
>   create mode 100755 tools/testing/selftests/drivers/net/bonding/bond-eth-type-change.sh
> 

For the series.
Acked-by: Jonathan Toppins <jtoppins@...hat.com>