linux-kernel - Re: [PATCH net-next,v2 1/3] net: sched: choke: remove unused variables in struct choke_sched

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Message-ID: <CANn89iLqXB-O7AP5qf+gGtK48fgYYxpciCyZa76jJNac9Bq1aQ@mail.gmail.com>
Date:   Mon, 29 Aug 2022 10:08:07 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Zhengchao Shao <shaozhengchao@...wei.com>
Cc:     netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>, weiyongjun1@...wei.com,
        YueHaibing <yuehaibing@...wei.com>
Subject: Re: [PATCH net-next,v2 1/3] net: sched: choke: remove unused
 variables in struct choke_sched_data

On Mon, Aug 29, 2022 at 1:14 AM Zhengchao Shao <shaozhengchao@...wei.com> wrote:
>
> The variable "other" in the struct choke_sched_data is not used. Remove it.
>
> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
> ---
> v1: qdisc_drop() already counts drops, unnecessary to use "other" to duplicate the same information.
> ---
>  include/uapi/linux/pkt_sched.h | 1 -
>  net/sched/sch_choke.c          | 2 --
>  2 files changed, 3 deletions(-)
>
> diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
> index f292b467b27f..32d49447cc7a 100644
> --- a/include/uapi/linux/pkt_sched.h
> +++ b/include/uapi/linux/pkt_sched.h
> @@ -396,7 +396,6 @@ struct tc_choke_qopt {
>  struct tc_choke_xstats {
>         __u32           early;          /* Early drops */
>         __u32           pdrop;          /* Drops due to queue limits */
> -       __u32           other;          /* Drops due to drop() calls */

You can not remove a field in UAPI.

>         __u32           marked;         /* Marked packets */
>         __u32           matched;        /* Drops due to flow match */
>  };
> diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
> index 25d2daaa8122..3ac3e5c80b6f 100644
> --- a/net/sched/sch_choke.c
> +++ b/net/sched/sch_choke.c
> @@ -60,7 +60,6 @@ struct choke_sched_data {
>                 u32     forced_drop;    /* Forced drops, qavg > max_thresh */
>                 u32     forced_mark;    /* Forced marks, qavg > max_thresh */
>                 u32     pdrop;          /* Drops due to queue limits */
> -               u32     other;          /* Drops due to drop() calls */
>                 u32     matched;        /* Drops to flow match */
>         } stats;
>
> @@ -464,7 +463,6 @@ static int choke_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
>                 .early  = q->stats.prob_drop + q->stats.forced_drop,
>                 .marked = q->stats.prob_mark + q->stats.forced_mark,
>                 .pdrop  = q->stats.pdrop,
> -               .other  = q->stats.other,
>                 .matched = q->stats.matched,
>         };
>
> --
> 2.17.1
>