netdev - Re: ipv6 not bringing up due to qdisc_tx_is

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Date:	Wed, 16 Mar 2016 19:14:26 +0200
From:	Nikolay Borisov <kernel@...p.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Nikolay Borisov <kernel@...p.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	SiteGround Operations <operations@...eground.com>
Subject: Re: ipv6 not bringing up due to qdisc_tx_is_noop failing

On Wed, Mar 16, 2016 at 7:07 PM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> Hello,

Hi,

>
> 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?

Actually no, the interface indeed shows no carrier yet ibping to other
hosts on the infiniband network works and ibstats shows the link as
being in up state. Do you have any ideas how to debug this further?

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

I don't think this is a regression.

>
> Thanks and bye,
> Hannes
>