netdev - Re: [PATCH net] net: sched: put back q.qlen into a single location

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Message-Id: <20190301.230710.1461472892990249466.davem@davemloft.net>
Date:   Fri, 01 Mar 2019 23:07:10 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        john.fastabend@...il.com, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us
Subject: Re: [PATCH net] net: sched: put back q.qlen into a single location

From: Eric Dumazet <edumazet@...gle.com>
Date: Thu, 28 Feb 2019 12:55:43 -0800

> In the series fc8b81a5981f ("Merge branch 'lockless-qdisc-series'")
> John made the assumption that the data path had no need to read
> the qdisc qlen (number of packets in the qdisc).
> 
> It is true when pfifo_fast is used as the root qdisc, or as direct MQ/MQPRIO
> children.
> 
> But pfifo_fast can be used as leaf in class full qdiscs, and existing
> logic needs to access the child qlen in an efficient way.
 ...

I'm going to let this sit a bit for review...