netdev - Re: [PATCH net-next 0/2] Fix qdisc noop issue caused by driver and identify future bugs

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Date:   Fri, 24 Apr 2020 16:45:08 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     netdev@...r.kernel.org, ilias.apalodimas@...aro.org,
        toke@...hat.com, ruxandra.radulescu@....com, ioana.ciornei@....com,
        nipun.gupta@....com, shawnguo@...nel.org
Subject: Re: [PATCH net-next 0/2] Fix qdisc noop issue caused by driver and
 identify future bugs

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Thu, 23 Apr 2020 16:57:40 +0200

> I've been very puzzled why networking on my NXP development board,
> using driver dpaa2-eth, stopped working when I updated the kernel
> version >= 5.3.  The observable issue were that interface would drop
> all TX packets, because it had assigned the qdisc noop.
> 
> This turned out the be a NIC driver bug, that would only get triggered
> when using sysctl net/core/default_qdisc=fq_codel. It was non-trivial
> to find out[1] this was driver related. Thus, this patchset besides
> fixing the driver bug, also helps end-user identify the issue.
> 
> [1]: https://github.com/xdp-project/xdp-project/blob/master/areas/arm64/board_nxp_ls1088/nxp-board04-troubleshoot-qdisc.org

Series applied to net-next, thanks.