linux-kernel - Re: [RFC PATCH v2 net-next 14/16] net: dsa: don't set skb->offload_fwd

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Message-ID: <CALW65jYc6DFoUiF55Q3KrhamPf75tFRSAkSA6ONrF3KMf9z+7g@mail.gmail.com>
Date:   Mon, 22 Mar 2021 16:04:01 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        netdev <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 14/16] net: dsa: don't set
 skb->offload_fwd_mark when not offloading the bridge

On Fri, Mar 19, 2021 at 6:49 PM Vladimir Oltean <olteanv@...il.com> wrote:
> Why would you even want to look at the source net device for forwarding?
> I'd say that if dp->bridge_dev is NULL in the xmit function, you certainly
> want to bypass address learning if you can. Maybe also for link-local traffic.

Also for trapped traffic (snooping, tc-flower trap action) if the CPU
sends them back.