netdev - Re: [PATCH v2 net] fq_codel: fix NET_XMIT

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Message-Id: <20160607.153935.952593668152189228.davem@davemloft.net>
Date:	Tue, 07 Jun 2016 15:39:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	fw@...len.de, netdev@...r.kernel.org, stasn77@...il.com,
	xiyou.wangcong@...il.com, jhs@...atatu.com
Subject: Re: [PATCH v2 net] fq_codel: fix NET_XMIT_CN behavior

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 04 Jun 2016 12:55:13 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> My prior attempt to fix the backlogs of parents failed.
> 
> If we return NET_XMIT_CN, our parents wont increase their backlog,
> so our qdisc_tree_reduce_backlog() should take this into account.
> 
> v2: Florian Westphal pointed out that we could drop the packet,
> so we need to save qdisc_pkt_len(skb) in a temp variable before
> calling fq_codel_drop()
> 
> Fixes: 9d18562a2278 ("fq_codel: add batch ability to fq_codel_drop()")
> Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
> Reported-by: Stas Nichiporovich <stasn77@...il.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.