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

[George Wilkie <gwilkie@vyatta.att-mail.com>]

On Wed, Apr 18, 2018 at 04:58:22PM +0200, Jiri Pirko wrote:
> Wed, Apr 18, 2018 at 03:35:49PM CEST, gwilkie@vyatta.att-mail.com wrote:
> >On Wed, Apr 18, 2018 at 02:56:44PM +0200, Jiri Pirko wrote:
> >> Wed, Apr 18, 2018 at 12:29:50PM CEST, gwilkie@vyatta.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).
> 
> Are you running a supplicant there or what is the use-case?
> 

We are using tun/tap interfaces for the team ports with the physical interfaces
under the control of a user process.

> How is this handle in other drivers like bond, openvswitch, bridge, etc?

It looks like bridge is using it, looking at br_port_carrier_check() and
br_add_if().

Cheers.

> 
> >
> >Cheers.
> >
> >> 
> >> >
> >> >Signed-off-by: George Wilkie <gwilkie@vyatta.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
> >> >