netdev - Re: [RFC PATCH] net: bridge: multicast querier per VLAN support

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Date:   Wed, 18 Apr 2018 19:27:43 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
CC:     Joachim Nilsson <troglobit@...il.com>, netdev@...r.kernel.org,
        roopa <roopa@...ulusnetworks.com>
Subject: Re: [RFC PATCH] net: bridge: multicast querier per VLAN support

On April 18, 2018 6:54:07 PM GMT+03:00, Stephen Hemminger <stephen@...workplumber.org> wrote:
>On Wed, 18 Apr 2018 16:14:26 +0300
>Nikolay Aleksandrov <nikolay@...ulusnetworks.com> wrote:
>
>> On 18/04/18 16:07, Joachim Nilsson wrote:
>> > On Wed, Apr 18, 2018 at 03:31:57PM +0300, Nikolay Aleksandrov
>wrote:  
>> >> On 18/04/18 15:07, Joachim Nilsson wrote:  
>> >>> - First of all, is this patch useful to anyone  
>> >> Obviously to us as it's based on our patch. :-)
>> >> We actually recently discussed what will be needed to make it
>acceptable to upstream.  
>> > 
>> > Great! :)
>> >   
>> >>> - The current br_multicast.c is very complex.  The support for
>both IPv4
>> >>>    and IPv6 is a no-brainer, but it also has #ifdef
>VLAN_FILTERING and
>> >>>    'br->vlan_enabled' ... this has likely been discussed before,
>but if
>> >>>    we could remove those code paths I believe what's left would
>be quite
>> >>>    a bit easier to read and maintain.  
>> >> br->vlan_enabled has a wrapper that can be used without ifdefs, as
>does br_vlan_find()
>> >> so in short - you can remove the ifdefs and use the wrappers, 
>they'll degrade to always
>> >> false/null when vlans are disabled.  
>> > 
>> > Thanks, I'll have a look at that and prepare an RFC v2!
>> >   
>> >>> - Many per-bridge specific multicast sysfs settings may need to
>have a
>> >>>    corresponding per-VLAN setting, e.g. snooping, query_interval,
>etc.
>> >>>    How should we go about that? (For status reporting I have a
>proposal)  
>> >> We'll have to add more to the per-vlan context, but yes it has to
>happen.
>> >> It will be only netlink interface for config/retrieval, no sysfs. 
>
>> > 
>> > Some settings are possible to do with sysfs, like
>multicast_query_interval
>> > and ...  
>> 
>> We want to avoid sysfs in general, all of networking config and stats
>> are moving to netlink. It is better controlled and structured for
>such
>> changes, also provides nice interfaces for automatic  type checks
>etc.
>> 
>> Also (but a minor reason) there is no tree/entity in sysfs for the
>vlans
>> where to add this. It will either have to be a file which does some
>> format string hack (like us currently) or will need to add new tree
>for
>> them which I'd really like to avoid for the bridge.
>
>In general, all bridge attributes need to show in netlink and sysfs.
>Sysfs is easier for scripting from languages.

True, but vlans and per-vlan settings have never been exposed via sysfs, only through netlink.
I'd like to avoid adding a directory with potentially 4k multiplied by the attr number for each vlan entries.

There is already vlan config infrastructure via netlink.