linux-kernel - Re: [PATCH V3 net-next 2/4] net: switchdev: add support for offloading of fdb locked flag

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Date:   Mon, 27 Jun 2022 19:06:34 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Hans Schultz <schultz.hans@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Hans Schultz <schultz.hans+netdev@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Shuah Khan <shuah@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Ido Schimmel <idosch@...dia.com>, linux-kernel@...r.kernel.org,
        bridge@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH V3 net-next 2/4] net: switchdev: add support for
 offloading of fdb locked flag

On Tue, May 24, 2022 at 05:21:42PM +0200, Hans Schultz wrote:
> Used for Mac-auth/MAB feature in the offloaded case.
> 
> Signed-off-by: Hans Schultz <schultz.hans+netdev@...il.com>
> ---
>  include/net/dsa.h       | 6 ++++++
>  include/net/switchdev.h | 3 ++-
>  net/bridge/br.c         | 3 ++-
>  net/bridge/br_fdb.c     | 7 +++++--
>  net/bridge/br_private.h | 2 +-
>  5 files changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index 14f07275852b..a5a843b2d67d 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -330,6 +330,12 @@ struct dsa_port {
>  	/* List of VLANs that CPU and DSA ports are members of. */
>  	struct mutex		vlans_lock;
>  	struct list_head	vlans;
> +
> +	/* List and maintenance of locked ATU entries */
> +	struct mutex		locked_entries_list_lock;
> +	struct list_head	atu_locked_entries_list;
> +	atomic_t		atu_locked_entry_cnt;
> +	struct delayed_work	atu_work;

DSA is not Marvell only, so please remove these from struct dsa_port and
place them somewhere like struct mv88e6xxx_port. Also, the change has
nothing to do in a patch with the "net: switchdev: " prefix.

>  };
>  
>  /* TODO: ideally DSA ports would have a single dp->link_dp member,
> diff --git a/include/net/switchdev.h b/include/net/switchdev.h
> index aa0171d5786d..62f4f7c9c7c2 100644
> --- a/include/net/switchdev.h
> +++ b/include/net/switchdev.h
> @@ -245,7 +245,8 @@ struct switchdev_notifier_fdb_info {
>  	u16 vid;
>  	u8 added_by_user:1,
>  	   is_local:1,
> -	   offloaded:1;
> +	   offloaded:1,
> +	   locked:1;

As mentioned by Ido, please update br_switchdev_fdb_populate() as part
of this change, in the bridge->switchdev direction. We should add a
comment near struct switchdev_notifier_fdb_info stating just that,
so that people don't forget.

>  };
>  
>  struct switchdev_notifier_port_obj_info {
> diff --git a/net/bridge/br.c b/net/bridge/br.c
> index 96e91d69a9a8..12933388a5a4 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 6b83e2d6435d..92469547283a 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -1135,7 +1135,7 @@ 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);
>  	} else {
>  		spin_lock_bh(&br->hash_lock);
>  		err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
> @@ -1365,7 +1365,7 @@ 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;
> @@ -1385,6 +1385,9 @@ 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 be17c99efe65..88913e6a59e1 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -815,7 +815,7 @@ 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
>