Re: [RFC PATCH v2 net-next 14/16] net: dsa: don't set skb->offload_fwd_mark when not offloading the bridge

[Vladimir Oltean]

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@xxxxxxxxx> 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.