netdev - Re: [PATCH net-next] ipmr: ip6mr: Add ability to display non default caches and vifs

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Date:   Wed, 18 Aug 2021 18:50:22 -0400
From:   Stephen Suryaputra <ssuryaextr@...il.com>
To:     Nikolay Aleksandrov <nikolay@...dia.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipmr: ip6mr: Add ability to display non default
 caches and vifs

On Thu, Aug 19, 2021 at 01:37:21AM +0300, Nikolay Aleksandrov wrote:
> 
> Sorry, but I don't see any point to this. We don't have it for any of the other
> non-default cases, and I don't see a point of having it for ipmr either.
> If you'd like to display the non-default tables then you query for them, you
> don't change a sysctl to see them in /proc.
> It sounds like a workaround for an issue that is not solved properly, and
> generally it shouldn't be using /proc. If netlink interfaces are not sufficient
> please improve them.

We found that the ability to dump the tables from kernel point of view
is valuable for debugging the applications. Sometimes during the
development, bugs in the use of the netlink interfaces can be solved
quickly if the tables in the kernel can be viewed easily.
> 
> Why do we need a whole new sysctl or net proc entries ?

If you agree on the reasoning above, what do you recommend then? Again,
this is to easily view what's in the kernel.

Thanks,
Stephen.