netdev - Re: [PATCH net-next 3/4] net: dsa: return -EOPNOTSUPP if .port_lag

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Message-ID: <878s7crlw1.fsf@waldekranz.com>
Date:   Thu, 25 Feb 2021 20:24:30 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        George McCollister <george.mccollister@...il.com>,
        DENG Qingfang <dqfext@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Oleksij Rempel <linux@...pel-privat.de>
Subject: Re: [PATCH net-next 3/4] net: dsa: return -EOPNOTSUPP if .port_lag_join is not implemented

On Sun, Feb 14, 2021 at 17:53, Vladimir Oltean <olteanv@...il.com> wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
>
> There is currently some provisioning for DSA to use the software
> fallback for link aggregation, but only if the .port_lag_join is
> implemented but it fails (for example because there are more link
> aggregation groups than the switch supports, or because the xmit hash
> policy cannot be done in hardware, or ...).
>
> But when .port_lag_join is not implemented at all, the DSA switch
> notifier returns zero and software fallback does not kick in.
> Change that.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---

Reviewed-by: Tobias Waldekranz <tobias@...dekranz.com>