linux-kernel - Re: [PATCH net-next 4/5] net: bridge: ensure FDB offloaded flag is handled as needed

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Date:   Wed, 1 Feb 2023 20:24:51 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     "Hans J. Schultz" <netdev@...io-technology.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        "maintainer:MICROCHIP KSZ SERIES ETHERNET SWITCH DRIVER" 
        <UNGLinuxDriver@...rochip.com>, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Russell King <linux@...linux.org.uk>,
        Christian Marangi <ansuelsmth@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "open list:RENESAS RZ/N1 A5PSW SWITCH DRIVER" 
        <linux-renesas-soc@...r.kernel.org>,
        "moderated list:ETHERNET BRIDGE" <bridge@...ts.linux-foundation.org>
Subject: Re: [PATCH net-next 4/5] net: bridge: ensure FDB offloaded flag is
 handled as needed

On Mon, Jan 30, 2023 at 06:34:28PM +0100, Hans J. Schultz wrote:
> Since user added entries in the bridge FDB will get the BR_FDB_OFFLOADED
> flag set, we do not want the bridge to age those entries and we want the
> entries to be deleted in the bridge upon an SWITCHDEV_FDB_DEL_TO_BRIDGE
> event.
> 
> Signed-off-by: Hans J. Schultz <netdev@...io-technology.com>
> ---
>  net/bridge/br_fdb.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
> index e69a872bfc1d..b0c23a72bc76 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -537,6 +537,7 @@ void br_fdb_cleanup(struct work_struct *work)
>  		unsigned long this_timer = f->updated + delay;
>  
>  		if (test_bit(BR_FDB_STATIC, &f->flags) ||
> +		    test_bit(BR_FDB_OFFLOADED, &f->flags) ||
>  		    test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) {
>  			if (test_bit(BR_FDB_NOTIFY, &f->flags)) {
>  				if (time_after(this_timer, now))

Looks correct

> @@ -1465,7 +1466,9 @@ int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
>  	spin_lock_bh(&br->hash_lock);
>  
>  	fdb = br_fdb_find(br, addr, vid);
> -	if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
> +	if (fdb &&
> +	    (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) ||
> +	     test_bit(BR_FDB_OFFLOADED, &fdb->flags)))

This also looks correct, but the function name is not really accurate
anymore. I guess you can keep it as-is unless someone has a better name

>  		fdb_delete(br, fdb, swdev_notify);
>  	else
>  		err = -ENOENT;
> -- 
> 2.34.1
>