netdev - Re: Deleting child qdisc doesn't reset parent to default qdisc?

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Message-ID: <1460652056.10638.50.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Thu, 14 Apr 2016 09:40:56 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Phil Sutter <phil@....cc>
Cc:	Jiri Kosina <jikos@...nel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Deleting child qdisc doesn't reset parent to default qdisc?

On Thu, 2016-04-14 at 18:22 +0200, Phil Sutter wrote:

> And those being invisible can be overridden using 'tc qd add', right?
> AFAIR they're not listed because they don't properly register, so the
> system doesn't care to override them. In this case we could change all
> classful qdiscs to restore the default qdisc if a leaf qdisc is being
> deleted instead of noop (which is probably not what the user wants
> anyway).

Even if they properly register, they are not visible.

Take a look at
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95dc19299f741c986227ec33e23cbf9b3321f812

for some context.

When a default pfifo is created on say a HTB class, you do not see it by
default in a dump.

If you have 100 HTB classes, HTB created 100 pfifo just fine, and it
works, unless an admin tries to delete them maybe ;)