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From: Tobias Waldekranz <tobias@waldekranz.com>
To: DENG Qingfang <dqfext@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Vladimir Oltean <olteanv@gmail.com>,
	Roopa Prabhu <roopa@nvidia.com>,
	Nikolay Aleksandrov <nikolay@nvidia.com>,
	netdev@vger.kernel.org
Subject: Re: [RFC net-next 7/7] net: dsa: mv88e6xxx: Request assisted learning on CPU port
Date: Wed, 03 Feb 2021 10:27:02 +0100	[thread overview]
Message-ID: <8735yd5wnt.fsf@waldekranz.com> (raw)
In-Reply-To: <20210201062439.15244-1-dqfext@gmail.com>

On Mon, Feb 01, 2021 at 14:24, DENG Qingfang <dqfext@gmail.com> wrote:
> Hi Tobias,
>
> I've tested your patch series on kernel 5.4 and found that it only works
> when VLAN filtering is enabled.
> After some debugging, I noticed DSA will add static entries to ATU 0 if
> VLAN filtering is disabled, regardless of default_pvid of the bridge,
> which is also the ATU# used by the bridge.

Good catch, thanks! This seems to stem from a different policy regarding
VLAN assignment in the bridge vs. how a Marvell switch works.

By default, a bridge will use a default PVID of 1, even when VLAN
filtering is disabled (nbp_vlan_init). Yet it will assign all packets to
VLAN 0 on ingress (br_handle_frame_finish->br_allowed_ingress).

The switch OTOH, will use the PVID of the port for all packets when
802.1Q is disabled, thus assigning all packets to VLAN 1 when VLAN
filtering is disabled.

Andrew, Vladimir: Should mv88e6xxx always set the PVID to 0 when VLAN
filtering is disabled?

> Currently I use the hack below to rewrite ATU# to 1, but it obviously
> does not solve the root cause.

Alternatively, as a userspace workaround, you can change the default
PVID to 0:

ip link set dev $BR type bridge vlan_default_pvid 0

  reply	other threads:[~2021-02-03  9:29 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-16  1:25 [RFC net-next 0/7] net: dsa: Sync local bridge FDB addresses to hardware Tobias Waldekranz
2021-01-16  1:25 ` [RFC net-next 1/7] net: bridge: switchdev: Refactor br_switchdev_fdb_notify Tobias Waldekranz
2021-01-17 17:24   ` Vladimir Oltean
2021-01-16  1:25 ` [RFC net-next 2/7] net: bridge: switchdev: Include local flag in FDB notifications Tobias Waldekranz
2021-01-17 19:30   ` Vladimir Oltean
2021-01-18 18:58     ` Tobias Waldekranz
2021-01-18 19:27       ` Vladimir Oltean
2021-01-18 20:19         ` Tobias Waldekranz
2021-01-18 21:03           ` Vladimir Oltean
2021-01-18 21:17           ` Nikolay Aleksandrov
2021-01-18 21:22             ` Nikolay Aleksandrov
2021-01-18 21:39               ` Nikolay Aleksandrov
2021-01-18 21:50                 ` Vladimir Oltean
2021-01-18 21:53                   ` Nikolay Aleksandrov
2021-01-18 22:06                     ` Vladimir Oltean
2021-01-18 22:09                       ` Vladimir Oltean
2021-01-18 22:42                       ` Nikolay Aleksandrov
2021-01-19  0:42                         ` Vladimir Oltean
2021-01-19 10:14                           ` Nikolay Aleksandrov
2021-01-18 19:28     ` Ido Schimmel
2021-01-16  1:25 ` [RFC net-next 3/7] net: bridge: switchdev: Send FDB notifications for host addresses Tobias Waldekranz
2021-01-18 11:28   ` Vladimir Oltean
2021-01-16  1:25 ` [RFC net-next 4/7] net: dsa: Include local addresses in assisted CPU port learning Tobias Waldekranz
2021-01-16  1:25 ` [RFC net-next 5/7] net: dsa: Include bridge " Tobias Waldekranz
2021-01-16  1:25 ` [RFC net-next 6/7] net: dsa: Sync static FDB entries on foreign interfaces to hardware Tobias Waldekranz
2021-01-16  1:25 ` [RFC net-next 7/7] net: dsa: mv88e6xxx: Request assisted learning on CPU port Tobias Waldekranz
2021-02-01  6:24 ` DENG Qingfang
2021-02-03  9:27   ` Tobias Waldekranz [this message]
2021-02-03 10:14     ` Vladimir Oltean
2021-02-03 10:42       ` Tobias Waldekranz

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