netdev - Re: [PATCH net-next v2 07/12] rtnetlink: add new rtm tunnel api for tunnel id filtering

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Date:   Tue, 22 Feb 2022 19:50:44 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Roopa Prabhu <roopa@...dia.com>
Cc:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <stephen@...workplumber.org>, <nikolay@...ulusnetworks.com>,
        <idosch@...dia.com>, <dsahern@...il.com>, <bpoirier@...dia.com>
Subject: Re: [PATCH net-next v2 07/12] rtnetlink: add new rtm tunnel api for
 tunnel id filtering

On Tue, 22 Feb 2022 18:49:03 -0800 Roopa Prabhu wrote:
> On 2/22/22 5:26 PM, Jakub Kicinski wrote:
> > Why create new RTM_ commands instead of using changelink?
> >
> > I thought we had to add special commands for bridge because
> > if the target of the command is not a bridge device but possibly
> > a bridge port, which could be anything. That's not the case here.
> >
> > Is it only about the convenience of add/del vs changelink where
> > we'd potentially have to pass and parse the entire vni list each time?  
> 
> yes, exactly. that's the reason. My first internal version used 
> changelink and soon realized it was too limiting.
> 
> especially notifications. Its too heavy to notify the full vni list 
> every-time.
> 
> IIRC bridge also went through a similar transition. Now bridge also has 
> RTM_*VLAN commands.

Makes sense. I wasn't quite sure if this isn't over-engineering
 - do deployments really use VxLAN devs with many VNIs?

> Couldn't think of another way than adding a new msg. Tried to keep the 
> name generic for use by potentially other dst/collect metadata devices

Ack, I don't have any better ideas either :)