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Date:   Thu, 5 Mar 2020 17:01:14 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>,
        Andrii Savka <andrii.savka@...ision.eu>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>
Subject: Re: [RFC net-next 0/3] net: marvell: prestera: Add Switchdev driver
 for Prestera family ASIC device 98DX326x (AC3x)

On Tue, Feb 25, 2020 at 04:30:52PM +0000, Vadym Kochan wrote:
> Marvell Prestera 98DX326x integrates up to 24 ports of 1GbE with 8
> ports of 10GbE uplinks or 2 ports of 40Gbps stacking for a largely
> wireless SMB deployment.

It seems that this device has enough ports to loopback to each other in
order to create meaningful topologies. Therefore, I suggest running
relevant existing tests under tools/testing/selftests/net/forwarding/
and contributing new ones. See tools/testing/selftests/net/forwarding/README
for details.

One problem you will run into is that your netdev notifier only allows
bridge uppers and will therefore veto VRF uppers, which is a
prerequisite. However, since you don't support L3 offload, then all
routed traffic should reach the CPU anyway and therefore VRF uppers can
be allowed.

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