linux-kernel - Re: [PATCH v3 net-next 08/14] net: bridge: mst: Add helper to check if MST is enabled

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Date:   Mon, 14 Mar 2022 12:43:10 +0200
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Tobias Waldekranz <tobias@...dekranz.com>, davem@...emloft.net,
        kuba@...nel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Russell King <linux@...linux.org.uk>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>,
        Cooper Lees <me@...perlees.com>,
        Matt Johnston <matt@...econstruct.com.au>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH v3 net-next 08/14] net: bridge: mst: Add helper to check
 if MST is enabled

On 14/03/2022 11:52, Tobias Waldekranz wrote:
> This is useful for switchdev drivers that might want to refuse to join
> a bridge where MST is enabled, if the hardware can't support it.
> 
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
> ---
>  include/linux/if_bridge.h | 5 +++++
>  net/bridge/br_mst.c       | 9 +++++++++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
> index 46e6327fef06..5dbab0a280a6 100644
> --- a/include/linux/if_bridge.h
> +++ b/include/linux/if_bridge.h
> @@ -119,6 +119,7 @@ int br_vlan_get_info(const struct net_device *dev, u16 vid,
>  		     struct bridge_vlan_info *p_vinfo);
>  int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid,
>  			 struct bridge_vlan_info *p_vinfo);
> +bool br_mst_enabled(struct net_device *dev);
>  int br_mst_get_info(struct net_device *dev, u16 msti, unsigned long *vids);
>  #else
>  static inline bool br_vlan_enabled(const struct net_device *dev)
> @@ -152,6 +153,10 @@ static inline int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid,
>  {
>  	return -EINVAL;
>  }
> +static inline bool br_mst_enabled(struct net_device *dev)
> +{
> +	return false;
> +}
>  static inline int br_mst_get_info(struct net_device *dev, u16 msti,
>  				  unsigned long *vids)
>  {
> diff --git a/net/bridge/br_mst.c b/net/bridge/br_mst.c
> index eb18dbd5838f..e5ab2ce451c2 100644
> --- a/net/bridge/br_mst.c
> +++ b/net/bridge/br_mst.c
> @@ -13,6 +13,15 @@
>  
>  DEFINE_STATIC_KEY_FALSE(br_mst_used);
>  
> +bool br_mst_enabled(struct net_device *dev)

const dev

> +{
> +	if (!netif_is_bridge_master(dev))
> +		return false;
> +
> +	return br_opt_get(netdev_priv(dev), BROPT_MST_ENABLED);
> +}
> +EXPORT_SYMBOL(br_mst_enabled);

EXPORT_SYMBOL_GPL

> +
>  int br_mst_get_info(struct net_device *dev, u16 msti, unsigned long *vids)
>  {
>  	struct net_bridge_vlan_group *vg;