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

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Message-ID: <20210322222304.ehinqbq67ikpubqx@skbuf>
Date:   Tue, 23 Mar 2021 00:23:04 +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 Mon, Mar 22, 2021 at 04:04:01PM +0800, DENG Qingfang wrote:
> 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.

This sounds line an interesting use case, please tell me more about what
commands I could run to reinject trapped packets into the hardware data
path.