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

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Message-ID: <CAE4R7bBRpEX+5J7Fbj=SuN8LcmcF8pH44y15emeB1pm_NgXGXw@mail.gmail.com>
Date:	Thu, 6 Aug 2015 09:37:12 -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 Thu, Aug 6, 2015 at 7:19 AM, Vivien Didelot
<vivien.didelot@...oirfairelinux.com> wrote:
> On 15-08-05 23:28:15, Scott Feldman wrote:
>> 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.
>
> I'm OK with the change. Should we consider NUD_NONE (0) a valid value?
>
>> >                 } 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;
>
> In other word, do we prefer this:
>
>     ndm->ndm_state = obj->u.fdb.ndm_state == NUD_NONE ?
>                      NUD_REACHABLE : obj->u.fdb.ndm_state;
>
> Or this (meaning switchdev users cannot leave it blank and must at least
> set NUD_REACHABLE themselves):
>
>     ndm->ndm_state = obj->u.fdb.ndm_state;

My preference would be this option.
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