netdev - Re: [PATCH net-next] net: dsa: return -EOPNOTSUPP when driver does not implement .port_lag

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Message-ID: <77c7a1f3-3d63-91e4-400d-8c7f72146890@gmail.com>
Date:   Tue, 29 Jun 2021 19:34:51 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH net-next] net: dsa: return -EOPNOTSUPP when driver does
 not implement .port_lag_join



On 6/29/2021 1:32 PM, Vladimir Oltean wrote:
> The DSA core has a layered structure, and even though we end up
> returning 0 (success) to user space when setting a bonding/team upper
> that can't be offloaded, some parts of the framework actually need to
> know that we couldn't offload that.
> 
> For example, if dsa_switch_lag_join returns 0 as it currently does,
> dsa_port_lag_join has no way to tell a successful offload from a
> software fallback, and it will call dsa_port_bridge_join afterwards.
> Then we'll think we're offloading the bridge master of the LAG, when in
> fact we're not even offloading the LAG. In turn, this will make us set
> skb->offload_fwd_mark = true, which is incorrect and the bridge doesn't
> like it.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

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