linux-kernel - 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 14:40:29 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        lkml <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 Mon, 11 May 2020 at 14:38, Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
>
> 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.
>

How about "accept_vlan_while_unaware"?

> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 10.2Mbps down 587kbps up

Thanks,
-Vladimir