netdev - Re: ipv6 not bringing up due to qdisc_tx_is

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Date:	Wed, 16 Mar 2016 18:07:44 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Nikolay Borisov <kernel@...p.com>,
	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org,
	SiteGround Operations <operations@...eground.com>
Subject: Re: ipv6 not bringing up due to qdisc_tx_is_noop failing

Hello,

On 16.03.2016 16:29, Nikolay Borisov wrote:
> I have stack traces which do show this sequence of events, so my
> questions now are:
>
> 1. What's the difference between netdev_queue->qdisc and
> netdev_queue->qdisc_sleeping. Git blaming indicates those member haves
> existed even before the git history was started.

qdisc_sleeping is the qdisc you configure before the device is brought 
up. It should transition during carrier up to the normal qdisc.

> 2. Shouldn't the netdev_queue->qdisc also be updated during
> attach_one_default_qdisc?

Yes, do you have carrier up on your card?

Is this a regression, did this work for you and stopped working with a 
specific kernel version?

Thanks and bye,
Hannes