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

[Ido Schimmel]

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 at kapio-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
>