netdev - Re: [PATCH] net: sched: fix `tc -s class show` no bstats on class with nolock subqueues

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Message-ID: <CAM_iQpWQDhJGYMDg9n8JyrWUdbYPPrBVWmaqKCvex28E50eUgw@mail.gmail.com>
Date:   Fri, 29 Nov 2019 21:17:27 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Dust Li <dust.li@...ux.alibaba.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>,
        John Fastabend <john.fastabend@...il.com>,
        Tony Lu <tonylu@...ux.alibaba.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: sched: fix `tc -s class show` no bstats on class
 with nolock subqueues

On Wed, Nov 27, 2019 at 10:29 PM Dust Li <dust.li@...ux.alibaba.com> wrote:
>
> When a classful qdisc's child qdisc has set the flag
> TCQ_F_CPUSTATS (pfifo_fast for example), the child qdisc's
> cpu_bstats should be passed to gnet_stats_copy_basic(),
> but many classful qdisc didn't do that. As a result,
> `tc -s class show dev DEV` always return 0 for bytes and
> packets in this case.
>
> Pass the child qdisc's cpu_bstats to gnet_stats_copy_basic()
> to fix this issue.
>
> The qstats also has this problem, but it has been fixed
> in 5dd431b6b9 ("net: sched: introduce and use qstats read...")
> and bstats still remains buggy.
>
> Fixes: 22e0f8b9322c ("net: sched: make bstats per cpu and estimator RCU safe")
> Signed-off-by: Dust Li <dust.li@...ux.alibaba.com>
> Signed-off-by: Tony Lu <tonylu@...ux.alibaba.com>

Acked-by: Cong Wang <xiyou.wangcong@...il.com>