linux-kernel - Re: [PATCH net-next 0/6] prestera: add basic router driver support

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Date:   Tue, 21 Dec 2021 06:28:42 +0200
From:   Yevhen Orlov <yevhen.orlov@...ision.eu>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Mickey Rachamim <mickeyr@...vell.com>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Taras Chornyi <tchornyi@...vell.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/6] prestera: add basic router driver support

On Sat, Dec 18, 2021 at 05:52:55PM +0100, Andrew Lunn wrote:
> On Fri, Dec 17, 2021 at 09:54:32PM +0200, Yevhen Orlov wrote:
> > Add initial router support for Marvell Prestera driver.
> > Subscribe on inetaddr notifications. TRAP packets, that has to be routed
> > (if packet has router's destination MAC address).
> 
> I must be missing something here. Why do you need to tell it the IP
> address in order to perform software routing? All the switch needs to
> know is the MAC address. Any packets for that MAC address should be
> trapped to the host. The host can then decide what to do with it,
> router, bridge, or consume it itself.

You are right. We don't pass IP address. Subscription is only needed
to enable rif. IP address is not used here.

> 
> > Add features:
> >  - Support ip address adding on port.
> >    e.g.: "ip address add PORT 1.1.1.1/24"
> 
> This should just work already. If it does not, you have something
> wrong in your current support.
> 
> 	Andrew

Yes. For now we has just enabled TRAP's for every port. This is good for
software routing. But in order to implement routes offloading - we need
to control, on which port packets is routed. So, this patchset
prepares infrastructure for future routes offloading implementation.