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: <368a9fef-740b-eac7-072a-d230cd4f6b1f@huawei.com>
Date:   Tue, 30 Aug 2022 08:44:49 +0800
From:   shaozhengchao <shaozhengchao@...wei.com>
To:     Eric Dumazet <edumazet@...gle.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 2022/8/30 1:08, Eric Dumazet wrote:
> 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
>>

Hi Eric:
	Thanks for the heads up. I'll pay attention in the future.

Zhengchao Shao