Subject: Re: [patch net-next] mlxsw: spectrum_switchdev: Allow port enslavement to a VLAN-unaware bridge

From: Ido Schimmel <[email-masked]>
Date: Wed, 21 Feb 2018 21:25:35 +0200

On Wed, Feb 21, 2018 at 11:16:35AM -0700, David Ahern wrote:
> On 2/20/18 12:45 AM, Jiri Pirko wrote:
> > From: Ido Schimmel <[email-masked]>
> > 
> > Up until now we only allowed VLAN devices to be put in a VLAN-unaware
> > bridge, but some users need the ability to enslave physical ports as
> > well.
> > 
> > This is achieved by mapping the port and VID 1 to the bridge's vFID,
> > instead of the port and the VID used by the VLAN device.
> > 
> > The above is valid because as long as the port is not enslaved to a
> > bridge, VID 1 is guaranteed to be configured as PVID and egress
> > untagged.
> > 
> > Signed-off-by: Ido Schimmel <[email-masked]>
> > Signed-off-by: Jiri Pirko <[email-masked]>
> > ---
> >  drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c | 12 +++++-------
> >  1 file changed, 5 insertions(+), 7 deletions(-)
> > 
> 
> Maybe I am missing something in the setup, but I am not getting
> host-to-host connectivity. I booted a switch with this patch, configured
> a bridge:
> 
> # ip a sh dev br0
> 44: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
> UP group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:79 brd ff:ff:ff:ff:ff:ff
>     inet6 3000:1000:1000:1000::1/80 scope global
>        valid_lft forever preferred_lft forever
>     inet6 fe80::7efe:90ff:fee8:3a79/64 scope link
>        valid_lft forever preferred_lft forever
> 
> Connected ports:
> # ip li sh master br0
> 36: swp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> master br0 state UP mode DEFAULT group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:7d brd ff:ff:ff:ff:ff:ff
> 37: swp1s1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> master br0 state UP mode DEFAULT group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:7e brd ff:ff:ff:ff:ff:ff
> 38: swp1s2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> master br0 state UP mode DEFAULT group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:7f brd ff:ff:ff:ff:ff:ff
> 39: swp1s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> master br0 state UP mode DEFAULT group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:80 brd ff:ff:ff:ff:ff:ff
> 40: swp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> master br0 state UP mode DEFAULT group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:79 brd ff:ff:ff:ff:ff:ff
> 41: swp3s1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> master br0 state UP mode DEFAULT group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:7a brd ff:ff:ff:ff:ff:ff
> 42: swp3s2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> master br0 state UP mode DEFAULT group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:7b brd ff:ff:ff:ff:ff:ff
> 43: swp3s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> master br0 state UP mode DEFAULT group default qlen 1000
>     link/ether 7c:fe:90:e8:3a:7c brd ff:ff:ff:ff:ff:ff
> 
> The switch can see the hosts:
> # net show lldp
> 
> LocalPort    Speed    Mode       RemotePort    RemoteHost
>              Summary
> -----------  -------  ---------  ------------
> -------------------------------------  -----------------------
> eth0         1G       Mgmt       swp37
> pioneerMS16.mvlab.cumulusnetworks.com  IP: 10.0.3.155/22(DHCP)
> swp1s0       10G      Access/L2  swp1          host1
>              Untagged: br0
> swp1s1       10G      Access/L2  swp1          host2
>              Untagged: br0
> swp1s2       10G      Access/L2  swp1          host3
>              Untagged: br0
> swp1s3       10G      Access/L2  swp1          host4
>              Untagged: br0
> swp3s0       10G      Access/L2  swp1          host5
>              Untagged: br0
> swp3s1       10G      Access/L2  swp1          host6
>              Untagged: br0
> swp3s2       10G      Access/L2  swp1          host7
>              Untagged: br0
> swp3s3       10G      Access/L2  swp1          host8
>              Untagged: br0

LLDP packets are trapped before L2 forwarding, which can explain why
LLDP works but forwarding doesn't.

> 
> and can talk to the hosts:
> # ping6 ff02::2%br0

Can you try ff02::1 ?

> PING ff02::2%br0(ff02::2) 56 data bytes
> 64 bytes from fe80::7efe:90ff:fee8:3a79: icmp_seq=1 ttl=64 time=0.073 ms
> 64 bytes from fe80::202:ff:fe00:2: icmp_seq=1 ttl=64 time=0.661 ms (DUP!)
> 64 bytes from fe80::202:ff:fe00:5: icmp_seq=1 ttl=64 time=0.705 ms (DUP!)
> 64 bytes from fe80::202:ff:fe00:1: icmp_seq=1 ttl=64 time=0.720 ms (DUP!)
> 64 bytes from fe80::202:ff:fe00:3: icmp_seq=1 ttl=64 time=0.729 ms (DUP!)
> 64 bytes from fe80::202:ff:fe00:6: icmp_seq=1 ttl=64 time=0.739 ms (DUP!)
> 64 bytes from fe80::202:ff:fe00:4: icmp_seq=1 ttl=64 time=0.748 ms (DUP!)
> 64 bytes from fe80::202:ff:fe00:7: icmp_seq=1 ttl=64 time=0.757 ms (DUP!)
> 64 bytes from fe80::202:ff:fe00:8: icmp_seq=1 ttl=64 time=0.766 ms (DUP!)
> 
> but the hosts can not talk to each other:
> 
> cumulus@host3:~$ net show lldp
> 
> LocalPort  Speed  Mode          RemoteHost   RemotePort
> ---------  -----  ------------  -----------  ----------
> swp1       10G    Interface/L3  mlx-2700-05  swp1s2
> 
> cumulus@host3:~$ ping6 3000:1000:1000:1000::2
> PING 3000:1000:1000:1000::2(3000:1000:1000:1000::2) 56 data bytes
> ^C
> --- 3000:1000:1000:1000::2 ping statistics ---
> 3 packets transmitted, 0 received, 100% packet loss, time 1999ms

Can you please try

# brctl showstp br0

To make sure STP state is set to forwarding?

Does it matter if you try IPv4 ping or if vlan_filtering is set 1?
Unfortunately, I can't reproduce on my switch.

Thanks for testing, David!