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

From	Eric Dumazet <eric.dumazet@gmail.com>
Newsgroups	linux.kernel
Subject	Re: Deleting child qdisc doesn't reset parent to default qdisc?
Date	2016-04-14 18:50 +0200
Message-ID	<rnSCT-4Y2-33@gated-at.bofh.it> (permalink)
References	(1 earlier) <rnR48-3Fm-83@gated-at.bofh.it> <rnRdM-3Ro-31@gated-at.bofh.it> <rnRx8-408-17@gated-at.bofh.it> <rnRGP-44y-33@gated-at.bofh.it> <rnSjw-4OE-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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 ;)

Thread

Deleting child qdisc doesn't reset parent to default qdisc? Jiri Kosina <jikos@kernel.org> - 2016-04-14 16:50 +0200
  Re: Deleting child qdisc doesn't reset parent to default qdisc? Jiri Kosina <jikos@kernel.org> - 2016-04-14 17:00 +0200
  Re: Deleting child qdisc doesn't reset parent to default qdisc? Eric Dumazet <eric.dumazet@gmail.com> - 2016-04-14 17:10 +0200
    Re: Deleting child qdisc doesn't reset parent to default qdisc? Phil Sutter <phil@nwl.cc> - 2016-04-14 17:20 +0200
      Re: Deleting child qdisc doesn't reset parent to default qdisc? Jiri Kosina <jikos@kernel.org> - 2016-04-14 17:40 +0200
        Re: Deleting child qdisc doesn't reset parent to default qdisc? Eric Dumazet <eric.dumazet@gmail.com> - 2016-04-14 17:50 +0200
          Re: Deleting child qdisc doesn't reset parent to default qdisc? Phil Sutter <phil@nwl.cc> - 2016-04-14 18:30 +0200
            Re: Deleting child qdisc doesn't reset parent to default qdisc? Eric Dumazet <eric.dumazet@gmail.com> - 2016-04-14 18:50 +0200
      Re: Deleting child qdisc doesn't reset parent to default qdisc? Jiri Kosina <jikos@kernel.org> - 2016-04-14 18:10 +0200
        Re: Deleting child qdisc doesn't reset parent to default qdisc? Eric Dumazet <eric.dumazet@gmail.com> - 2016-04-14 19:50 +0200
          Re: Deleting child qdisc doesn't reset parent to default qdisc? Jamal Hadi Salim <jhs@mojatatu.com> - 2016-04-15 14:50 +0200
            Re: Deleting child qdisc doesn't reset parent to default qdisc? Eric Dumazet <eric.dumazet@gmail.com> - 2016-04-15 17:00 +0200

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