netdev - Re: [RFC PATCH v2 net-next 07/16] net: dsa: sync ageing time when joining the bridge

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Message-ID: <7bc2c277-e75c-35e7-23d7-78616757177e@gmail.com>
Date:   Fri, 19 Mar 2021 15:13:03 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com, Vadym Kochan <vkochan@...vell.com>,
        Taras Chornyi <tchornyi@...vell.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Ivan Vecera <ivecera@...hat.com>, linux-omap@...r.kernel.org,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [RFC PATCH v2 net-next 07/16] net: dsa: sync ageing time when
 joining the bridge



On 3/18/2021 4:18 PM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> The SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME attribute is only emitted from:
> 
> sysfs/ioctl/netlink
> -> br_set_ageing_time
>    -> __set_ageing_time
> 
> therefore not at bridge port creation time, so:
> (a) drivers had to hardcode the initial value for the address ageing time,
>     because they didn't get any notification
> (b) that hardcoded value can be out of sync, if the user changes the
>     ageing time before enslaving the port to the bridge
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
>  include/linux/if_bridge.h |  6 ++++++
>  net/bridge/br_stp.c       | 13 +++++++++++++
>  net/dsa/port.c            | 10 ++++++++++
>  3 files changed, 29 insertions(+)
> 
> diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
> index 920d3a02cc68..ebd16495459c 100644
> --- a/include/linux/if_bridge.h
> +++ b/include/linux/if_bridge.h
> @@ -137,6 +137,7 @@ struct net_device *br_fdb_find_port(const struct net_device *br_dev,
>  void br_fdb_clear_offload(const struct net_device *dev, u16 vid);
>  bool br_port_flag_is_set(const struct net_device *dev, unsigned long flag);
>  u8 br_port_get_stp_state(const struct net_device *dev);
> +clock_t br_get_ageing_time(struct net_device *br_dev);
>  #else
>  static inline struct net_device *
>  br_fdb_find_port(const struct net_device *br_dev,
> @@ -160,6 +161,11 @@ static inline u8 br_port_get_stp_state(const struct net_device *dev)
>  {
>  	return BR_STATE_DISABLED;
>  }
> +
> +static inline clock_t br_get_ageing_time(struct net_device *br_dev)
> +{
> +	return 0;
> +}
>  #endif
>  
>  #endif
> diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
> index 86b5e05d3f21..3dafb6143cff 100644
> --- a/net/bridge/br_stp.c
> +++ b/net/bridge/br_stp.c
> @@ -639,6 +639,19 @@ int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time)
>  	return 0;
>  }
>  
> +clock_t br_get_ageing_time(struct net_device *br_dev)
> +{
> +	struct net_bridge *br;
> +
> +	if (!netif_is_bridge_master(br_dev))
> +		return 0;
> +
> +	br = netdev_priv(br_dev);
> +
> +	return jiffies_to_clock_t(br->ageing_time);

Don't you want an ASSERT_RTNL() in this function as well?
-- 
Florian