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

Hans Schultz
2022-03-23T12:30:07Z

On tor, mar 17, 2022 at 10:39, Hans Schultz <schultz.hans@gmail.com> wrote:
> Used for Mac-auth/MAB feature in the offloaded case.
>
> Signed-off-by: Hans Schultz <schultz.hans+netdev@gmail.com>
> ---
> 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