netdev - Re: [PATCH net-next V2] net: sched: fallback to qdisc noqueue if default qdisc setup fail

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Message-Id: <20200504.115111.2011826515282537226.davem@davemloft.net>
Date:   Mon, 04 May 2020 11:51:11 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     netdev@...r.kernel.org, kuba@...nel.org,
        stephen@...workplumber.org, dsahern@...il.com
Subject: Re: [PATCH net-next V2] net: sched: fallback to qdisc noqueue if
 default qdisc setup fail

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Thu, 30 Apr 2020 13:42:22 +0200

> Currently if the default qdisc setup/init fails, the device ends up with
> qdisc "noop", which causes all TX packets to get dropped.
> 
> With the introduction of sysctl net/core/default_qdisc it is possible
> to change the default qdisc to be more advanced, which opens for the
> possibility that Qdisc_ops->init() can fail.
> 
> This patch detect these kind of failures, and choose to fallback to
> qdisc "noqueue", which is so simple that its init call will not fail.
> This allows the interface to continue functioning.
> 
> V2:
> As this also captures memory failures, which are transient, the
> device is not kept in IFF_NO_QUEUE state.  This allows the net_device
> to retry to default qdisc assignment.
> 
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

Applied, thanks.