netdev - Re: [PATCH net-next 1/2] bridge: Add a limit on FDB entries

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Date: Tue, 16 May 2023 13:44:28 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: Nikolay Aleksandrov <razor@...ckwall.org>
Cc: Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>,
	Oleksij Rempel <linux@...pel-privat.de>,
	Johannes Nixdorf <jnixdorf-oss@....de>, netdev@...r.kernel.org,
	bridge@...ts.linux-foundation.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Roopa Prabhu <roopa@...dia.com>, Ido Schimmel <idosch@...dia.com>
Subject: Re: [PATCH net-next 1/2] bridge: Add a limit on FDB entries

On Tue, May 16, 2023 at 01:32:05PM +0300, Nikolay Aleksandrov wrote:
> Let's take a step back, I wasn't suggesting we start with a full-fledged switchdev
> implementation. :) I meant only to see if the minimum global limit implementation
> suggested would suffice and would be able to later extend so switchdev can use and
> potentially modify (e.g. drivers setting limits etc). We can start with a simple
> support for limits and then extend accordingly. The important part here is to
> not add any uAPI that can't be changed later which would impact future changes.

I guess adding a global per-bridge learning limit now makes sense and
would not unreasonably hinder switchdev later on. The focus is on
"learning limit" and not a limit to user-created entries as Johannes has
currently done in v1. I don't necessarily see an urgent need for
IFLA_BR_FDB_CUR_ENTRIES, given the fact that user space can dump the FDB
and count what it needs, filtering for FDB types accordingly.