linux-kernel - Re: [RFC PATCH v2 net-next 01/16] net: dsa: call dsa_port_bridge_join when joining a LAG that is already in a bridge

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Message-ID: <fc343be0-a420-8d49-69f3-f15dd9dc8a18@gmail.com>
Date:   Fri, 19 Mar 2021 15:04:18 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com, Vadym Kochan <vkochan@...vell.com>,
        Taras Chornyi <tchornyi@...vell.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Ivan Vecera <ivecera@...hat.com>, linux-omap@...r.kernel.org,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [RFC PATCH v2 net-next 01/16] net: dsa: call dsa_port_bridge_join
 when joining a LAG that is already in a bridge



On 3/18/2021 4:18 PM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> DSA can properly detect and offload this sequence of operations:
> 
> ip link add br0 type bridge
> ip link add bond0 type bond
> ip link set swp0 master bond0
> ip link set bond0 master br0
> 
> But not this one:
> 
> ip link add br0 type bridge
> ip link add bond0 type bond
> ip link set bond0 master br0
> ip link set swp0 master bond0
> 
> Actually the second one is more complicated, due to the elapsed time
> between the enslavement of bond0 and the offloading of it via swp0, a
> lot of things could have happened to the bond0 bridge port in terms of
> switchdev objects (host MDBs, VLANs, altered STP state etc). So this is
> a bit of a can of worms, and making sure that the DSA port's state is in
> sync with this already existing bridge port is handled in the next
> patches.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian