netdev - Re: [RFC PATCH net-next 01/16] bridge: Add MAC Authentication Bypass (MAB) support

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Date:   Mon, 31 Oct 2022 17:40:36 +0100
From:   netdev@...io-technology.com
To:     Ido Schimmel <idosch@...dia.com>
Cc:     netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, jiri@...dia.com, petrm@...dia.com,
        ivecera@...hat.com, roopa@...dia.com, razor@...ckwall.org,
        vladimir.oltean@....com, mlxsw@...dia.com
Subject: Re: [RFC PATCH net-next 01/16] bridge: Add MAC Authentication Bypass
 (MAB) support

On 2022-10-31 15:43, Ido Schimmel wrote:
> On Sun, Oct 30, 2022 at 11:09:31PM +0100, netdev@...io-technology.com 
> wrote:
>> On 2022-10-25 12:00, Ido Schimmel wrote:
>> > @@ -943,6 +946,14 @@ static int br_setport(struct net_bridge_port *p,
>> > struct nlattr *tb[],
>> >  	br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_SUPPRESS,
>> > BR_NEIGH_SUPPRESS);
>> >  	br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
>> >  	br_set_port_flag(p, tb, IFLA_BRPORT_LOCKED, BR_PORT_LOCKED);
>> > +	br_set_port_flag(p, tb, IFLA_BRPORT_MAB, BR_PORT_MAB);
>> > +
>> > +	if ((p->flags & BR_PORT_MAB) &&
>> > +	    (!(p->flags & BR_PORT_LOCKED) || !(p->flags & BR_LEARNING))) {
>> > +		NL_SET_ERR_MSG(extack, "MAB can only be enabled on a locked port
>> > with learning enabled");
>> 
>> It's a bit odd to get this message when turning off learning on a port 
>> with
>> MAB on, e.g....
>> 
>> # bridge link set dev a2 learning off
>> Error: MAB can only be enabled on a locked port with learning enabled.
> 
> It's better if you suggest something else. How about:
> 
> "Bridge port must be locked and have learning enabled when MAB is 
> enabled"
> 
> ?

Yes, I think that is better in case it should not be split into more 
than one
message. At least it is not bound to a specific action.