netdev - Re: [PATCH] net: orphan queued skbs if device tx can stall

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Date:	Tue, 10 Apr 2012 12:04:19 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Jamal Hadi Salim <hadi@...erus.ca>,
	Stephen Hemminger <shemminger@...tta.com>,
	Jason Wang <jasowang@...hat.com>,
	Neil Horman <nhorman@...driver.com>,
	Jiri Pirko <jpirko@...hat.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Herbert Xu <herbert@...dor.hengli.com.au>
Subject: Re: [PATCH] net: orphan queued skbs if device tx can stall

On Tue, 2012-04-10 at 12:31 +0300, Michael S. Tsirkin wrote:

> True. Still this is the only interface we have for controlling
> the internal queue length so it seems safe to assume someone
> is using it for this purpose.
> 

So to workaround a problem in tun, you want to hack net/core/dev.c :(

Packets in qdisc should not be orphaned.

If you think about it, why do we attach skb to socket in the first
place ?

If its not needed for tun, why should it be needed for other devices ?

If TUN has a problem being stopped forever, maybe it should take
appropriate action to flush all packets in qdisc queue after a while, as
this makes no sense to delay packets forever.



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