# Re: \[RFC net-next 1/2\] net: dsa: tag\_mtk: skip address learning on transmit to standalone ports

- From: Vladimir Oltean \<olteanv@gmail.com\>
- Date: 2021-07-30 17:41:41 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/07/1463593
- Thread: https://ratatoskr.run/netdev/2021/07/1461210/t.md

```text
On Fri, Jul 30, 2021 at 08:39:02PM +0300, Vladimir Oltean wrote:
> On Sat, Jul 31, 2021 at 01:32:03AM +0800, DENG Qingfang wrote:
> > On Fri, Jul 30, 2021 at 07:24:03PM +0300, Vladimir Oltean wrote:
> > > Considering that you also have the option of setting
> > > ds->assisted_learning_on_cpu_port = true and this will have less false
> > > positives, what are the reasons why you did not choose that approach?
> > 
> > You're right. Hardware learning on CPU port does have some limitations.
> > 
> > I have been testing a multi CPU ports patch, and assisted learning has
> > to be used, because FDB entries should be installed like multicast
> > ones, which point to all CPU ports.
> 
> Ah, mt7530 is one of the switches which has multiple CPU ports, I had
> forgotten that. In that case, then static FDB entries are pretty much
> the only way to go indeed.

I forget which ones are the modes in which the multi-CPU feature on
mt7530 is supposed to be used: static assignment of user ports to CPU
ports, or LAG between the CPU ports, or a mix of both?

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```