netdev - Re: [RFC PATCH 10/17] net: sched: qdisc

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Message-ID: <CAF=yD-KiBQ06vMyshQd4WNXP8S2iRKeWfW10LM116Z=Kd+Va0A@mail.gmail.com>
Date:   Tue, 14 Nov 2017 20:16:06 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <eric.dumazet@...il.com>, make0818@...il.com,
        Network Development <netdev@...r.kernel.org>,
        Jiří Pírko <jiri@...nulli.us>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [RFC PATCH 10/17] net: sched: qdisc_qlen for per cpu logic

On Mon, Nov 13, 2017 at 3:10 PM, John Fastabend
<john.fastabend@...il.com> wrote:
> Add qdisc qlen helper routines for lockless qdiscs to use.
>
> The qdisc qlen is no longer used in the hotpath but it is reported
> via stats query on the qdisc so it still needs to be tracked. This
> adds the per cpu operations needed.
>
> Signed-off-by: John Fastabend <john.fastabend@...il.com>
> ---
>  0 files changed
>
> diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
> index 4717c4b..bad24a9 100644
> --- a/include/net/sch_generic.h
> +++ b/include/net/sch_generic.h
> @@ -291,8 +291,16 @@ static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
>         BUILD_BUG_ON(sizeof(qcb->data) < sz);
>  }
>
> +static inline int qdisc_qlen_cpu(const struct Qdisc *q)
> +{
> +       return this_cpu_ptr(q->cpu_qstats)->qlen;
> +}
> +
>  static inline int qdisc_qlen(const struct Qdisc *q)
>  {
> +       if (q->flags & TCQ_F_NOLOCK)
> +               return qdisc_qlen_cpu(q);

Shouldn't this return qdisc_qlen_sum from the follow-on patch?
The two patches can also be squashed.