linux-kernel - Re: [PATCH net v2] net: bridge: mst: Check vlan state for egress decision

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Message-ID: <9aff7e76-0799-4439-afff-a5ca4880bc72@blackwall.org>
Date: Thu, 11 Jul 2024 16:43:30 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Elliot Ayrey <elliot.ayrey@...iedtelesis.co.nz>, davem@...emloft.net
Cc: Roopa Prabhu <roopa@...dia.com>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Tobias Waldekranz <tobias@...dekranz.com>, bridge@...ts.linux.dev,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net: bridge: mst: Check vlan state for egress
 decision

On 11/07/2024 07:59, Elliot Ayrey wrote:
> If a port is blocking in the common instance but forwarding in an MST
> instance, traffic egressing the bridge will be dropped because the
> state of the common instance is overriding that of the MST instance.
> 
> Fix this by skipping the port state check in MST mode to allow
> checking the vlan state via br_allowed_egress(). This is similar to
> what happens in br_handle_frame_finish() when checking ingress
> traffic, which was introduced in the change below.
> 
> Fixes: ec7328b59176 ("net: bridge: mst: Multiple Spanning Tree (MST) mode")
> Signed-off-by: Elliot Ayrey <elliot.ayrey@...iedtelesis.co.nz>
> ---
> 
> v2:
>   - Restructure the MST mode check to make it read better
> v1: https://lore.kernel.org/all/20240705030041.1248472-1-elliot.ayrey@alliedtelesis.co.nz/
> 
>  net/bridge/br_forward.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
> index d97064d460dc..e63d6f6308f8 100644
> --- a/net/bridge/br_forward.c
> +++ b/net/bridge/br_forward.c
> @@ -25,8 +25,8 @@ static inline int should_deliver(const struct net_bridge_port *p,
>  
>  	vg = nbp_vlan_group_rcu(p);
>  	return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
> -		p->state == BR_STATE_FORWARDING && br_allowed_egress(vg, skb) &&
> -		nbp_switchdev_allowed_egress(p, skb) &&
> +		(br_mst_is_enabled(p->br) || state == BR_STATE_FORWARDING) &&

Does this compile at all? How exactly did you test this change?
There is no "state" variable in that context.