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net: dsa: mv88e6xxx: fix vlan setup

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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.

Allow the VLAN configuration to be updated on Marvell DSA bridges,
otherwise we end up cutting all traffic when enabling vlan filtering.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/E1kYAU3-00071C-1G@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King 2020-10-29 16:09:03 +00:00 committed by Jakub Kicinski
parent 85bec4bc91
commit 1fb7419198
1 changed files with 1 additions and 0 deletions
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1
drivers/net/dsa/mv88e6xxx/chip.c
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@ -2851,6 +2851,7 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
chip->ds = ds;
ds->slave_mii_bus = mv88e6xxx_default_mdio_bus(chip);
ds->configure_vlan_while_not_filtering = true;
mv88e6xxx_reg_lock(chip);