netdev - Re: [PATCH net-next 2/3] net: bridge: mcast: update multicast contex when vlan state is changed

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Message-ID: <9e714c8f-b890-4e89-88ae-d6d61772e0a3@blackwall.org>
Date: Sat, 19 Apr 2025 09:39:29 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Petr Machata <petrm@...dia.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 netdev@...r.kernel.org
Cc: Ido Schimmel <idosch@...dia.com>, bridge@...ts.linux.dev,
 Yong Wang <yongwang@...dia.com>, Andy Roulin <aroulin@...dia.com>,
 mlxsw@...dia.com
Subject: Re: [PATCH net-next 2/3] net: bridge: mcast: update multicast contex
 when vlan state is changed

On 4/17/25 16:43, Petr Machata wrote:
> From: Yong Wang <yongwang@...dia.com>
> 
> When the vlan STP state is changed, which could be manipulated by
> "bridge vlan" commands, similar to port STP state, this also impacts
> multicast behaviors such as igmp query. In the scenario of per-VLAN
> snooping, there's a need to update the corresponding multicast context
> to re-arm the port query timer when vlan state becomes "forwarding" etc.
> 
> Update br_vlan_set_state() function to enable vlan multicast context
> in such scenario.
> 
> Before the patch, the IGMP query does not happen in the last step of the
> following test sequence, i.e. no growth for tx counter:
>  # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
>  # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
>  # ip link add name swp1 up master br1 type dummy
>  # sleep 1
>  # bridge vlan set vid 1 dev swp1 state 4
>  # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
> 1
>  # sleep 1
>  # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
> 1
>  # bridge vlan set vid 1 dev swp1 state 3
>  # sleep 2
>  # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
> 1
> 
> After the patch, the IGMP query happens in the last step of the test:
>  # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
>  # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
>  # ip link add name swp1 up master br1 type dummy
>  # sleep 1
>  # bridge vlan set vid 1 dev swp1 state 4
>  # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
> 1
>  # sleep 1
>  # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
> 1
>  # bridge vlan set vid 1 dev swp1 state 3
>  # sleep 2
>  # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
> 3
> 
> Signed-off-by: Yong Wang <yongwang@...dia.com>
> Reviewed-by: Andy Roulin <aroulin@...dia.com>
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
> Signed-off-by: Petr Machata <petrm@...dia.com>
> ---
>  net/bridge/br_mst.c       |  4 ++--
>  net/bridge/br_multicast.c | 26 ++++++++++++++++++++++++++
>  net/bridge/br_private.h   | 11 ++++++++++-
>  3 files changed, 38 insertions(+), 3 deletions(-)
> 

Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>