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

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Date:   Thu, 19 Apr 2018 10:33:41 +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 09:17:32PM +0200, Jiri Pirko wrote:
> Wed, Apr 18, 2018 at 05:33:12PM CEST, gwilkie@...tta.att-mail.com wrote:
> >On Wed, Apr 18, 2018 at 04:58:22PM +0200, Jiri Pirko wrote:
> >> Wed, Apr 18, 2018 at 03:35:49PM CEST, gwilkie@...tta.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@...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).
> >> 
> >> 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().
> 
> Okay, so why do you still need to check netif_carrier_ok?
> Looks like netif_oper_up is enough, right?

Yes, I was being overly cautious. Replacing netif_carrier_ok with netif_oper_up
works OK. I'll send updated patch.

Cheers.


> 
> 
> >
> >Cheers.
> >
> >> 
> >> >
> >> >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
> >> >> >
> 
>