netdev - Re: [PATCH net-next 01/15] net: dsa: provide an option for drivers to always receive bridge VLANs

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Date:   Mon, 11 May 2020 12:38:50 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 01/15] net: dsa: provide an option for drivers
 to always receive bridge VLANs

On Sun, May 10, 2020 at 07:42:41PM +0300, Vladimir Oltean wrote:
> From: Russell King <rmk+kernel@...linux.org.uk>
> 
> DSA assumes that a bridge which has vlan filtering disabled is not
> vlan aware, and ignores all vlan configuration. However, the kernel
> software bridge code allows configuration in this state.
> 
> This causes the kernel's idea of the bridge vlan state and the
> hardware state to disagree, so "bridge vlan show" indicates a correct
> configuration but the hardware lacks all configuration. Even worse,
> enabling vlan filtering on a DSA bridge immediately blocks all traffic
> which, given the output of "bridge vlan show", is very confusing.
> 
> Provide an option that drivers can set to indicate they want to receive
> vlan configuration even when vlan filtering is disabled. At the very
> least, this is safe for Marvell DSA bridges, which do not look up
> ingress traffic in the VTU if the port is in 8021Q disabled state. It is
> also safe for the Ocelot switch family. Whether this change is suitable
> for all DSA bridges is not known.
> 
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

This patch was NAK'd because of objections to the "vlan_bridge_vtu"
name.  Unfortunately, this means that the bug for Marvell switches
remains unfixed to this day.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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