linux-kernel - Re: [PATCH net-next v2 2/7] net: switchdev: support static FDB addresses

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Date:	Wed, 5 Aug 2015 23:28:15 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kernel <kernel@...oirfairelinux.com>,
	"David S. Miller" <davem@...emloft.net>,
	Guenter Roeck <linux@...ck-us.net>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH net-next v2 2/7] net: switchdev: support static FDB addresses

On Wed, Aug 5, 2015 at 10:44 PM, Vivien Didelot
<vivien.didelot@...oirfairelinux.com> wrote:
> This patch adds a is_static boolean to the switchdev_obj_fdb structure,
> in order to set the ndm_state to either NUD_NOARP or NUD_REACHABLE.
>
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> ---
>  include/net/switchdev.h   | 1 +
>  net/switchdev/switchdev.c | 2 +-
>  2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/include/net/switchdev.h b/include/net/switchdev.h
> index e90e1a0..0e296b8 100644
> --- a/include/net/switchdev.h
> +++ b/include/net/switchdev.h
> @@ -72,6 +72,7 @@ struct switchdev_obj {
>                 struct switchdev_obj_fdb {              /* PORT_FDB */
>                         u8 addr[ETH_ALEN];
>                         u16 vid;
> +                       bool is_static;

What do you think about changing this to u16 ndm_state?  That way, it
can be used on input (fdb add) and output (fdb dump), and the driver
can privately track the state, kind of like how the bridge keeps
is_static, is_local, etc.

>                 } fdb;
>         } u;
>  };
> diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
> index 9db87a3..e9d1cac 100644
> --- a/net/switchdev/switchdev.c
> +++ b/net/switchdev/switchdev.c
> @@ -811,7 +811,7 @@ static int switchdev_port_fdb_dump_cb(struct net_device *dev,
>         ndm->ndm_flags   = NTF_SELF;
>         ndm->ndm_type    = 0;
>         ndm->ndm_ifindex = dev->ifindex;
> -       ndm->ndm_state   = NUD_REACHABLE;
> +       ndm->ndm_state   = obj->u.fdb.is_static ? NUD_NOARP : NUD_REACHABLE;
>
>         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, obj->u.fdb.addr))
>                 goto nla_put_failure;
> --
> 2.4.6
>
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