linux-kernel - Re: [net-next PATCH 3/3] net: dsa: qca8k: limit user ports access to the first CPU port on setup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <64c2c142.5d0a0220.9ae33.deab@mx.google.com>
Date:   Thu, 27 Jul 2023 21:10:56 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Atin Bainada <hi@...nb.me>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH 3/3] net: dsa: qca8k: limit user ports access to
 the first CPU port on setup

On Wed, Jul 26, 2023 at 04:18:51PM +0300, Vladimir Oltean wrote:
> On Mon, Jul 24, 2023 at 05:30:58AM +0200, Christian Marangi wrote:
> > In preparation for multi-CPU support, set CPU port LOOKUP MEMBER outside
> > the port loop and setup the LOOKUP MEMBER mask for user ports only to
> > the first CPU port.
> > 
> > This is to handle flooding condition where every CPU port is set as
> > target and prevent packet duplication for unknown frames from user ports.
> > 
> > Secondary CPU port LOOKUP MEMBER mask will be setup later when
> > port_change_master will be implemented.
> > 
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
> 
> This is kinda "net.git" material, in the sense that it fixes the current
> driver behavior with device trees from the future, right?

This is not strictly a fix. The secondary CPU (if defined) doesn't have
flood enabled so the switch won't forward packet. It's more of a
cleanup/preparation from my point of view. What do you think?

-- 
	Ansuel