Re: B53 DSA switch problem on Banana Pi-R1 on Fedora 26 - systemd-networkd problem

[Gerhard Wiesinger <lists@wiesinger.com>]

On 24.05.2018 08:22, Gerhard Wiesinger wrote:
> On 24.05.2018 07:29, Gerhard Wiesinger wrote:
>> After some analysis with Florian (thnx) we found out that the current 
>> implementation is broken:
>>
>> https://patchwork.ozlabs.org/patch/836538/
>> https://github.com/torvalds/linux/commit/c499696e7901bda18385ac723b7bd27c3a4af624#diff-a2b6f8d89e18de600e873ac3ac43fa1d 
>>
>>
>> Florians comment:
>>
>> c499696e7901bda18385ac723b7bd27c3a4af624 ("net: dsa: b53: Stop using
>> dev->cpu_port incorrectly") since it would result in no longer setting
>> the CPU port as tagged for a specific VLAN. Easiest way for you right
>> now is to just revert it, but this needs some more thoughts for a proper
>> upstream change. I will think about it some more.
>
> Can confirm 4.14.18-200.fc26.armv7hl works, 4.15.x should be broken.
>
> # Kernel 4.14.x ok
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/log/drivers/net/dsa/b53?h=v4.14.43 
>
> # Kernel 4.15.x should be NOT ok
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/log/drivers/net/dsa/b53?h=v4.15.18 
>

Kernel 4.14.18-300.fc27.armv7hl works well so far, even with FC28 
update. Florian send me a patch to try for 4.16.x

I got the  commands below to work with manual script commands.
Afterwards I wrote systemd-networkd config where I've a strage problem 
when IPv6 sends a multicast broadcast from another machine to the bridge 
this will be sent back via the network interface, but with the source 
MAC of the bridge of the other machine. dmesg from the other machine:
[117768.330444] br0: received packet on lan0 with own address as source 
address (addr:a0:36:9f:ab:cd:ef, vlan:0)
[117768.334887] br0: received packet on lan0 with own address as source 
address (addr:a0:36:9f:ab:cd:ef, vlan:0)
[117768.339281] br0: received packet on lan0 with own address as source 
address (addr:a0:36:9f:ab:cd:ef, vlan:0)

And: If I just enter this command after e.g. a systemd-network restart 
everything is fine forever:
# Not OK (dmesg message above is triggered on a remote computer, whole 
switching network gets unstable, ssh terminals close, packet loss, etc.)
systemctl restart systemd-networkd
# OK again when this command is entered
bridge vlan add dev wan vid 102 pvid untagged

brctl show, ip link, bridge vlan, bridge link commands, etc. look all 
the same, also /sys/class/net/br0/bridge, /sys/class/net/br1/bridge settings

Systemd config correct?
Any ideas?

Thank you.

Ciao,
Gerhard

brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.665da2abcdef       no              eth0.101
                                                         lan1
                                                         lan2
                                                         lan3
                                                         lan4
br1             8000.9a4557abcdef      no              eth0.102
                                                         wan


bridge vlan show
port    vlan ids
lan2     101 PVID Egress Untagged

lan3     101 PVID Egress Untagged

lan4     101 PVID Egress Untagged

wan      102 PVID Egress Untagged

lan1     101 PVID Egress Untagged

br1     None
br0     None
eth0.102        None
eth0.101        None

================================================================================================================================================================

OK: manual scripts

================================================================================================================================================================

ip link add link eth0 name eth0.101 type vlan id 101
ip link set eth0.101 up
ip link add link eth0 name eth0.102 type vlan id 102
ip link set eth0.102 up
ip link add br0 type bridge
ip link set dev br0 type bridge stp_state 0
ip link set lan1 master br0
bridge vlan add dev lan1 vid 101 pvid untagged
ip link set lan1 up
ip link set lan2 master br0
bridge vlan add dev lan2 vid 101 pvid untagged
ip link set lan2 up
ip link set lan3 master br0
bridge vlan add dev lan3 vid 101 pvid untagged
ip link set lan3 up
ip link set lan4 master br0
bridge vlan add dev lan4 vid 101 pvid untagged
ip link set lan4 up
ip link set eth0.101 master br0
ip link set eth0.101 up
ip link set br0 up
ip link add br1 type bridge
ip link set dev br1 type bridge stp_state 0
ip link set wan master br1
bridge vlan add dev wan vid 102 pvid untagged
ip link set wan up
ip link set eth0.102 master br1
ip link set eth0.102 up
ip link set br1 up
ip addr flush dev br0
ip addr add 192.168.0.250/24 dev br0
ip route del default via 192.168.0.1 dev br0
ip route add default via 192.168.0.1 dev br0
ip addr flush dev br1
ip addr add 192.168.1.1/24 dev br1


================================================================================================================================================================

NOK: after a multicast packet is received

================================================================================================================================================================

================================================================================
= /etc/systemd/network/40-autogen-eth0.101.netdev
================================================================================
[NetDev]
Name=eth0.101
Kind=vlan

[VLAN]
Id=101
================================================================================
= /etc/systemd/network/40-autogen-eth0.102.netdev
================================================================================
[NetDev]
Name=eth0.102
Kind=vlan

[VLAN]
Id=102
================================================================================
= /etc/systemd/network/40-autogen-eth0.network
================================================================================
[Match]
Name=eth0

[Network]
VLAN=eth0.101
VLAN=eth0.102
================================================================================
= /etc/systemd/network/50-autogen-br0.netdev
================================================================================
[NetDev]
Name=br0
Kind=bridge

[Bridge]
DefaultPVID=none
VLANFiltering=false
STP=false
================================================================================
= /etc/systemd/network/50-autogen-br1.netdev
================================================================================
[NetDev]
Name=br1
Kind=bridge

[Bridge]
DefaultPVID=none
VLANFiltering=false
STP=false
================================================================================
= /etc/systemd/network/60-autogen-br0-eth0.101.network
================================================================================
[Match]
Name=eth0.101

[Network]
Bridge=br0
================================================================================
= /etc/systemd/network/60-autogen-br0-lan1.network
================================================================================
[Match]
Name=lan1

[Network]
Bridge=br0

[BridgeVLAN]
VLAN=101
EgressUntagged=101
PVID=101
================================================================================
= /etc/systemd/network/60-autogen-br0-lan2.network
================================================================================
[Match]
Name=lan2

[Network]
Bridge=br0

[BridgeVLAN]
VLAN=101
EgressUntagged=101
PVID=101
================================================================================
= /etc/systemd/network/60-autogen-br0-lan3.network
================================================================================
[Match]
Name=lan3

[Network]
Bridge=br0

[BridgeVLAN]
VLAN=101
EgressUntagged=101
PVID=101
================================================================================
= /etc/systemd/network/60-autogen-br0-lan4.network
================================================================================
[Match]
Name=lan4

[Network]
Bridge=br0

[BridgeVLAN]
VLAN=101
EgressUntagged=101
PVID=101
================================================================================
= /etc/systemd/network/60-autogen-br1-eth0.102.network
================================================================================
[Match]
Name=eth0.102

[Network]
Bridge=br1
================================================================================
= /etc/systemd/network/60-autogen-br1-wan.network
================================================================================
[Match]
Name=wan

[Network]
Bridge=br1

[BridgeVLAN]
VLAN=102
EgressUntagged=102
PVID=102
================================================================================
= /etc/systemd/network/61-autogen-br0.network
================================================================================
[Match]
Name=br0

[Network]
Address=192.168.0.250/24
Gateway=192.168.0.1
DNS=192.168.0.1
Domains=intern
================================================================================
= /etc/systemd/network/61-autogen-br1.network
================================================================================
[Match]
Name=br1

[Network]
Address=192.168.1.1/24