netdev - Re: [Regression] Bonding no longer support tun-interfaces

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Date:	Mon, 8 Aug 2016 14:21:12 -0700
From:	Jörn Engel <joern@...estorage.com>
To:	dingtianhong <dingtianhong@...wei.com>,
	Jay Vosburgh <fubar@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	Andy Gospodarek <andy@...yhouse.net>, netdev@...r.kernel.org
Subject: Re: [Regression] Bonding no longer support tun-interfaces

Redirected by Davem.

Is there a mailing list or a maintainer for regressions?  There used to
be, but I've been out of the loop for a while.

On Mon, Aug 08, 2016 at 02:15:30PM -0700, Jörn Engel wrote:
> This has been reported (and ignored) before:
> http://lkml.iu.edu/hypermail/linux/kernel/1407.2/03790.html
> https://bugzilla.kernel.org/show_bug.cgi?id=89161
> 
> Regression was introduced by:
> 
> commit 00503b6f702e (refs/bisect/bad)
> Author: dingtianhong <dingtianhong@...wei.com>
> Date:   Sat Jan 25 13:00:29 2014 +0800
> 
>     bonding: fail_over_mac should only affect AB mode at enslave and removal processing
>     
>     According to bonding.txt, the fail_over_ma should only affect active-backup mode,
>     but I found that the fail_over_mac could be set to active or follow in all
>     modes, this will cause new slave could not be set to bond's MAC address at
>     enslave processing and restore its own MAC address at removal processing.
>     
>     The correct way to fix the problem is that we should not add restrictions when
>     setting options, just need to modify the bond enslave and removal processing
>     to check the mode in addition to fail_over_mac when setting a slave's MAC during
>     enslavement. The change active slave processing already only calls the fail_over_mac
>     function when in active-backup mode.
>     
>     Thanks for Jay's suggestion.
>     
>     The patch also modify the pr_warning() to pr_warn().
>     
>     Cc: Jay Vosburgh <fubar@...ibm.com>
>     Cc: Veaceslav Falico <vfalico@...hat.com>
>     Cc: Andy Gospodarek <andy@...yhouse.net>
>     Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> Since I never needed bonding or tun-interfaces before, I come late to
> the party.  Some 6k lines have changed in the bonding driver since the
> regression got in two years ago.  So a simple revert is unlikely to lead
> to happiness.
> 
> But I absolutely need that functionality and would rather run a 3.13
> kernel than live with the regression.  dingtianhong, any suggestions?
> 
> Jörn
> 
> --
> It is a cliché that most clichés are true, but then, like most clichés,
> that cliché is untrue.
> -- Stephen Fry

Jörn

--
I can say that I spend most of my time fixing bugs even if I have lots
of new features to implement in mind, but I give bugs more priority.
-- Andrea Arcangeli, 2000