netdev - Re: [PATCH net-next] team: account for oper state

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Date:   Wed, 18 Apr 2018 14:35:49 +0100
From:   George Wilkie <gwilkie@...tta.att-mail.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] team: account for oper state

On Wed, Apr 18, 2018 at 02:56:44PM +0200, Jiri Pirko wrote:
> Wed, Apr 18, 2018 at 12:29:50PM CEST, gwilkie@...tta.att-mail.com wrote:
> >Account for operational state when determining port linkup state,
> >as per Documentation/networking/operstates.txt.
> 
> Could you please point me to the exact place in the document where this
> is suggested?
> 

Various places cover it I think.

In 1. Introduction:
"interface is not usable just because the admin enabled it"
"userspace must be granted the possibility to
influence operational state"

In 4. Setting from userspace:
"the userspace application can set IFLA_OPERSTATE
to IF_OPER_DORMANT or IF_OPER_UP as long as the driver does not set
netif_carrier_off() or netif_dormant_on()"

We have a use case where we want to set the oper state of the team ports based
on whether they are actually usable or not (as opposed to just admin up).

Cheers.

> 
> >
> >Signed-off-by: George Wilkie <gwilkie@...tta.att-mail.com>
> >---
> > drivers/net/team/team.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> >diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
> >index a6c6ce19eeee..231264a05e55 100644
> >--- a/drivers/net/team/team.c
> >+++ b/drivers/net/team/team.c
> >@@ -2918,7 +2918,8 @@ static int team_device_event(struct notifier_block *unused,
> > 	case NETDEV_CHANGE:
> > 		if (netif_running(port->dev))
> > 			team_port_change_check(port,
> >-					       !!netif_carrier_ok(port->dev));
> >+					       !!(netif_carrier_ok(port->dev) &&
> >+						  netif_oper_up(port->dev)));
> > 		break;
> > 	case NETDEV_UNREGISTER:
> > 		team_del_slave(port->team->dev, dev);
> >-- 
> >2.11.0
> >