linux-kernel - Re: [PATCH net-next v4 1/6] net: bridge: Set BR_FDB_ADDED_BY_USER early in fdb_add

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Message-ID: <a2a5ede9-c93e-915d-61be-c2c2fab18479@blackwall.org>
Date:   Wed, 20 Sep 2023 13:44:16 +0300
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Johannes Nixdorf <jnixdorf-oss@....de>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>, David Ahern <dsahern@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ido Schimmel <idosch@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Paolo Abeni <pabeni@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>, Shuah Khan <shuah@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>
Cc:     bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net-next v4 1/6] net: bridge: Set BR_FDB_ADDED_BY_USER
 early in fdb_add_entry

On 9/19/23 11:12, Johannes Nixdorf wrote:
> In preparation of the following fdb limit for dynamically learned entries,
> allow fdb_create to detect that the entry was added by the user. This
> way it can skip applying the limit in this case.
> 
> Signed-off-by: Johannes Nixdorf <jnixdorf-oss@....de>
> ---
>   net/bridge/br_fdb.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
> index e69a872bfc1d..f517ea92132c 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -1056,7 +1056,8 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
>   		if (!(flags & NLM_F_CREATE))
>   			return -ENOENT;
>   
> -		fdb = fdb_create(br, source, addr, vid, 0);
> +		fdb = fdb_create(br, source, addr, vid,
> +				 BIT(BR_FDB_ADDED_BY_USER));
>   		if (!fdb)
>   			return -ENOMEM;
>   
> @@ -1069,6 +1070,8 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
>   			WRITE_ONCE(fdb->dst, source);
>   			modified = true;
>   		}
> +
> +		set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
>   	}
>   
>   	if (fdb_to_nud(br, fdb) != state) {
> @@ -1100,8 +1103,6 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
>   	if (fdb_handle_notify(fdb, notify))
>   		modified = true;
>   
> -	set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
> -
>   	fdb->used = jiffies;
>   	if (modified) {
>   		if (refresh)
> 

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