netdev - Re: [PATCH v2 iproute2 0/3] Multiple Spanning Tree (MST) Support

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Date: Wed, 26 Jun 2024 14:47:20 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Tobias Waldekranz <tobias@...dekranz.com>
Cc: stephen@...workplumber.org, dsahern@...nel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 iproute2 0/3] Multiple Spanning Tree (MST) Support

On Mon, Jun 24, 2024 at 03:00:32PM +0200, Tobias Waldekranz wrote:
> This series adds support for:
> 
> - Enabling MST on a bridge:
> 
>       ip link set dev <BR> type bridge mst_enable 1
> 
> - (Re)associating VLANs with an MSTI:
> 
>       bridge vlan global set dev <BR> vid <X> msti <Y>
> 
> - Setting the port state in a given MSTI:
> 
>       bridge mst set dev <PORT> msti <Y> state <Z>
> 
> - Listing the current port MST states:
> 
>       bridge mst show

Tested-by: Hangbin Liu <liuhangbin@...il.com>

With following steps:
+ /home/iproute2/ip/ip link add br0 type bridge
+ /home/iproute2/ip/ip link set br0 type bridge mst_enabled 1
+ /home/iproute2/ip/ip link add type veth
+ /home/iproute2/ip/ip link set veth0 master br0
+ /home/iproute2/bridge/bridge vlan add dev br0 vid 1-3 self
+ /home/iproute2/bridge/bridge vlan global set dev br0 vid 2 msti 3
+ /home/iproute2/bridge/bridge vlan add dev veth0 vid 1-3
+ /home/iproute2/bridge/bridge mst set dev veth0 msti 3 state 1
+ /home/iproute2/bridge/bridge mst show
port              msti
veth0             0
                    state disabled
                  3
                    state listening


There is one issue I got (should be kernel issue):

+ /home/iproute2/ip/ip link set br0 type bridge mst_enabled 0
Error: MST mode can't be changed while VLANs exist.

  If I want disable mst, I got failed as there is VLAN info, which is expected

+ /home/iproute2/ip/ip link set veth0 nomaster
+ /home/iproute2/ip/ip link set veth0 master br0
+ /home/iproute2/ip/ip link set br0 type bridge mst_enabled 0
Error: MST mode can't be changed while VLANs exist.

  But I got failed again after remove and re-add veth0, is this expected?
  I thought the VLAN info should be cleared after removing.

+ /home/iproute2/ip/ip link set veth0 nomaster
+ /home/iproute2/ip/ip link set br0 type bridge mst_enabled 0

  It works after I remove veth0.