netdev - Re: Regression with improved multi chip isolation

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Date:   Sun, 6 Mar 2022 21:27:13 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Tobias Waldekranz <tobias@...dekranz.com>,
        netdev <netdev@...r.kernel.org>,
        "emeric.dupont@....aero" <emeric.dupont@....aero>
Subject: Re: Regression with improved multi chip isolation

> This example of injecting traffic through br0.11 is interesting because
> I think that Tobias' patch merely exposes a shortcoming of tag_dsa.c.
> The tagger should inject packets into the switch in VLAN 4095
> (MV88E6XXX_VID_BRIDGED), because the ports offload a VLAN-unaware bridge.
> Yet my guess is that it probably does so in VID 11 - this can be seen
> using tcpdump and analyzing the DSA header.

20:25:42.239330 5a:e0:ae:a2:f6:db (oui Unknown) > Broadcast, ethertype MEDSA (0xdada), length 50: Forward, tagged, dev.port:vlan 3.0:11, pri 0: ethertype ARP (0x0806) Request who-has 10.42.11.2 tell 10.42.11.1, length 28
20:25:43.279670 5a:e0:ae:a2:f6:db (oui Unknown) > Broadcast, ethertype MEDSA (0xdada), length 50: Forward, tagged, dev.port:vlan 3.0:11, pri 0: ethertype ARP (0x0806) Request who-has 10.42.11.2 tell 10.42.11.1, length 28
20:25:44.319299 5a:e0:ae:a2:f6:db (oui Unknown) > Broadcast, ethertype MEDSA (0xdada), length 50: Forward, tagged, dev.port:vlan 3.0:11, pri 0: ethertype ARP (0x0806) Request who-has 10.42.11.2 tell 10.42.11.1, length 28
20:25:45.359288 5a:e0:ae:a2:f6:db (oui Unknown) > Broadcast, ethertype MEDSA (0xdada), length 50: Forward, tagged, dev.port:vlan 3.0:11, pri 0: ethertype ARP (0x0806) Request who-has 10.42.11.2 tell 10.42.11.1, length 28

	Andrew