Subject: Re: [PATCH v2 net-next 2/4] net: switchdev: add support for offloading of fdb locked flag

From: Hans Schultz <[email-masked]>
Date: Wed, 23 Mar 2022 13:29:52 +0100

On tor, mar 17, 2022 at 10:39, Hans Schultz <[email-masked]> wrote:
> Used for Mac-auth/MAB feature in the offloaded case.
>
> Signed-off-by: Hans Schultz <[email-masked]>
> ---
>  include/net/switchdev.h | 3 ++-
>  net/bridge/br.c         | 3 ++-
>  net/bridge/br_fdb.c     | 7 +++++--
>  net/bridge/br_private.h | 2 +-
>  4 files changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/include/net/switchdev.h b/include/net/switchdev.h
> index 3e424d40fae3..d5d923411f5e 100644
> --- a/include/net/switchdev.h
> +++ b/include/net/switchdev.h
> @@ -229,7 +229,8 @@ struct switchdev_notifier_fdb_info {
>  	u16 vid;
>  	u8 added_by_user:1,
>  	   is_local:1,
> -	   offloaded:1;
> +	   offloaded:1,
> +	   locked:1;
>  };
>  
>  struct switchdev_notifier_port_obj_info {
> diff --git a/net/bridge/br.c b/net/bridge/br.c
> index b1dea3febeea..adcdbecbc218 100644
> --- a/net/bridge/br.c
> +++ b/net/bridge/br.c
> @@ -166,7 +166,8 @@ static int br_switchdev_event(struct notifier_block *unused,
>  	case SWITCHDEV_FDB_ADD_TO_BRIDGE:
>  		fdb_info = ptr;
>  		err = br_fdb_external_learn_add(br, p, fdb_info->addr,
> -						fdb_info->vid, false);
> +						fdb_info->vid, false,
> +						fdb_info->locked);
>  		if (err) {
>  			err = notifier_from_errno(err);
>  			break;
> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
> index 57ec559a85a7..57aa1955d34d 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -987,7 +987,7 @@ static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
>  					   "FDB entry towards bridge must be permanent");
>  			return -EINVAL;
>  		}
> -		err = br_fdb_external_learn_add(br, p, addr, vid, true);
> +		err = br_fdb_external_learn_add(br, p, addr, vid, true,
>  false);

Does someone have an idea why there at this point is no option to add a
dynamic fdb entry?

The fdb added entries here do not age out, while the ATU entries do
(after 5 min), resulting in unsynced ATU vs fdb.

>  	} else {
>  		spin_lock_bh(&br->hash_lock);
>  		err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
> @@ -1216,7 +1216,7 @@ void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
>  
>  int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
>  			      const unsigned char *addr, u16 vid,
> -			      bool swdev_notify)
> +			      bool swdev_notify, bool locked)
>  {
>  	struct net_bridge_fdb_entry *fdb;
>  	bool modified = false;
> @@ -1236,6 +1236,9 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
>  		if (!p)
>  			flags |= BIT(BR_FDB_LOCAL);
>  
> +		if (locked)
> +			flags |= BIT(BR_FDB_ENTRY_LOCKED);
> +
>  		fdb = fdb_create(br, p, addr, vid, flags);
>  		if (!fdb) {
>  			err = -ENOMEM;
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index f5a0b68c4857..3275e33b112f 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -790,7 +790,7 @@ int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
>  void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
>  int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
>  			      const unsigned char *addr, u16 vid,
> -			      bool swdev_notify);
> +			      bool swdev_notify, bool locked);
>  int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
>  			      const unsigned char *addr, u16 vid,
>  			      bool swdev_notify);
> -- 
> 2.30.2