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

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Date:   Fri, 19 Mar 2021 12:49:24 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     DENG Qingfang <dqfext@...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 05:29:12PM +0800, DENG Qingfang wrote:
> On Fri, Mar 19, 2021 at 5:06 PM Vladimir Oltean <olteanv@...il.com> wrote:
> >
> > This is a good point actually, which I thought about, but did not give a
> > lot of importance to for the moment. Either we go full steam ahead with
> > assisted learning on the CPU port for everybody, and we selectively
> > learn the addresses relevant to the bridging funciton only, or we do
> > what you say, but then it will be a little bit more complicated IMO, and
> > have hardware dependencies, which isn't as nice.
> 
> Are skb->offload_fwd_mark and source DSA switch kept in dsa_slave_xmit?
> I think SA learning should be bypassed iff skb->offload_fwd_mark == 1 and
> source DSA switch == destination DSA switch.

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.