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Date:   Wed, 08 Jan 2020 12:47:36 -0800 (PST)
From:   David Miller <>
Subject: Re: [PATCH net 0/2] When ungrafting from PRIO, replace child with

From: Petr Machata <>
Date: Mon, 6 Jan 2020 18:01:53 +0000

> When a child Qdisc is removed from one of the PRIO Qdisc's bands, it is
> replaced unconditionally by a NOOP qdisc. As a result, any traffic hitting
> that band gets dropped. That is incorrect--no Qdisc was explicitly added
> when PRIO was created, and after removal, none should have to be added
> either.
> In patch #2, this problem is fixed for PRIO by first attempting to create a
> default Qdisc and only falling back to noop when that fails. This pattern
> of attempting to create an invisible FIFO, using NOOP only as a fallback,
> is also seen in some other Qdiscs.
> The only driver currently offloading PRIO (and thus presumably the only one
> impacted by this) is mlxsw. Therefore patch #1 extends mlxsw to handle the
> replacement by an invisible FIFO gracefully.

Series applied, and queued up for -stable, thanks!

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