netdev - Re: [RFC PATCH net-next 02/12] selftests: forwarding: Add a test for FDB learning

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Date:   Mon, 15 Jan 2018 22:05:20 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Ido Schimmel <idosch@...lanox.com>, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org, davem@...emloft.net,
        shuah@...nel.org, dsahern@...il.com, nikolay@...ulusnetworks.com,
        roopa@...ulusnetworks.com, andy@...yhouse.net, jiri@...lanox.com,
        mlxsw@...lanox.com, saeedm@...lanox.com, tariqt@...lanox.com,
        jhs@...atatu.com, lucasb@...atatu.com, f.fainelli@...il.com,
        vivien.didelot@...oirfairelinux.com, jakub.kicinski@...ronome.com,
        simon.horman@...ronome.com
Subject: Re: [RFC PATCH net-next 02/12] selftests: forwarding: Add a test for
 FDB learning

Hi Andrew,

On Mon, Jan 15, 2018 at 08:41:46PM +0100, Andrew Lunn wrote:
> On Mon, Jan 15, 2018 at 09:18:43PM +0200, Ido Schimmel wrote:
> > Send a packet with a specific destination MAC, make sure it was learned
> > on the ingress port and then aged-out.
> 
> It would be interesting to show the hardware actually uses the FDB,
> not just learns it. Send some packets back, and ensure they go out the
> intended port. Also, check they don't go out a third port, i.e. make
> sure the hardware is not flooding. Once it has aged-out, then test is
> is flooding out all ports.

Good idea. We can actually do that with only two ports. Disable flooding
on port A, check packets with DMAC A don't egress the port. Inject a
packet with SMAC A through port A, check packets with DMAC A egress the
port.