Merge branch 'dsa-vlan'

Florian Fainelli says:

====================
net: dsa: VLAN devices w/ filtering

This patch series supports having VLAN devices on top of DSA/switch
ports while the switch has VLAN filtering globally turned on (as is the
case with Broadcom switches). Whether the switch does global or per-port
VLAN filtering, having VLAN entries for these VLAN devices is
beneficial.

We take care of a few possibly problematic cases:

- adding a VLAN device while there is an existing VLAN entry created by
  a VLAN aware bridge. The entire bridge's VLAN database and not just
  the specific bridge port is being checked to be safe and conserative

- adding a bridge VLAN entry when there is an existing VLAN device
  created is also not possible because that would lead to the bridge
  being able to manipulate the VLAN device's VID/attributes under its feet

- enslaving a VLAN device into a VLAN aware bridge since that duplicates
  functionality already offered by the VLAN aware bridge

Here are the different test cases that were run to exercise this:

ip addr flush dev gphy
ip link add dev br0 type bridge
echo 1 > /sys/class/net/br0/bridge/vlan_filtering
ip link set dev gphy master br0
udhcpc -i br0

vconfig add rgmii_1 100
ifconfig rgmii_1.100 192.168.100.10
ping -c 2 192.168.100.1

vconfig add br0 42
bridge vlan add vid 42 dev gphy
bridge vlan add vid 42 dev br0 self
ifconfig br0.42 192.168.42.2
ping -c 2 192.168.42.1

ip link del rgmii_1.100
vconfig add rgmii_1 100
ifconfig rgmii_1.100 192.168.100.10
ping -c 2 192.168.100.1
echo 0 > /sys/class/net/br0/bridge/vlan_filtering
ping -c 2 192.168.100.1

ip link del rgmii_1.100
echo 1 > /sys/class/net/br0/bridge/vlan_filtering

vconfig add rgmii_1 100
brctl addif br0 rgmii_1
bridge vlan add vid 100 dev rgmii_1

vconfig rem rgmii_1.100
bridge vlan add vid 100 dev rgmii_1
vconfig add rgmii_1 100

bridge vlan del vid 100 dev rgmii_1
vconfig add rgmii_1 100
brctl addif br0 rgmii_1.100
====================

Signed-off-by: David S. Miller <davem@davemloft.net>