netdev - Re: [PATCHv2 next] net: add option to not create fall-back tunnels in root-ns as well

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Date:   Tue, 25 Aug 2020 16:00:10 -0700
From:   Mahesh Bandewar (महेश बंडेवार) 
        <maheshb@...gle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Mahesh Bandewar <mahesh@...dewar.net>,
        Maciej Zenczykowski <maze@...gle.com>,
        Jian Yang <jianyang@...gle.com>
Subject: Re: [PATCHv2 next] net: add option to not create fall-back tunnels in
 root-ns as well

On Tue, Aug 25, 2020 at 3:47 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> On 8/25/20 3:42 PM, Mahesh Bandewar wrote:
> > The sysctl that was added  earlier by commit 79134e6ce2c ("net: do
> > not create fallback tunnels for non-default namespaces") to create
> > fall-back only in root-ns. This patch enhances that behavior to provide
> > option not to create fallback tunnels in root-ns as well. Since modules
> > that create fallback tunnels could be built-in and setting the sysctl
> > value after booting is pointless, so added a kernel cmdline options to
> > change this default. The default setting is preseved for backward
> > compatibility. The kernel command line option of fb_tunnels=initns will
> > set the sysctl value to 1 and will create fallback tunnels only in initns
> > while kernel cmdline fb_tunnels=none will set the sysctl value to 2 and
> > fallback tunnels are skipped in every netns.
> >
> > Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
> > Cc: Eric Dumazet <edumazet@...gle.com>
> > Cc: Maciej Zenczykowski <maze@...gle.com>
> > Cc: Jian Yang <jianyang@...gle.com>
> > ---
> > v1->v2
> >   Removed the Kconfig option which would force rebuild and replaced with
> >   kcmd-line option
> >
> >  .../admin-guide/kernel-parameters.txt         |  5 +++++
> >  Documentation/admin-guide/sysctl/net.rst      | 20 +++++++++++++------
> >  include/linux/netdevice.h                     |  7 ++++++-
> >  net/core/sysctl_net_core.c                    | 17 ++++++++++++++--
> >  4 files changed, 40 insertions(+), 9 deletions(-)
> >
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> > index a1068742a6df..09a51598c792 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -801,6 +801,11 @@
> >
> >       debug_objects   [KNL] Enable object debugging
> >
> > +     fb_tunnels=     [NET]
> > +                     Format: { initns | none }
> > +                     See Documentation/admin-guide/sysctl/net.rst for
> > +                     fb_tunnels_only_for_init_ns
> > +
>
> Not at this location in this file.
> Entries in this file are meant to be in alphabetical order (mostly).
>
> So leave debug_objects and no_debug_objects together, and insert fb_tunnels
> between fail_make_request= and floppy=.
>
I see. I'll fix it in the next revision.
thanks for the suggestion.
--mahesh..

> Thanks.
>
> >       no_debug_objects
> >                       [KNL] Disable object debugging
> >
>
> --
> ~Randy
>