netdev - Re: [PATCH net-next 10/14] net_sched: sch_fq_pie: implement lockless fq_pie

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Message-ID: <20240417171349.GF2320920@kernel.org>
Date: Wed, 17 Apr 2024 18:13:49 +0100
From: Simon Horman <horms@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . 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>,
	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next 10/14] net_sched: sch_fq_pie: implement lockless
 fq_pie_dump()

On Mon, Apr 15, 2024 at 01:20:50PM +0000, Eric Dumazet wrote:
> Instead of relying on RTNL, fq_pie_dump() can use READ_ONCE()
> annotations, paired with WRITE_ONCE() ones in fq_pie_change().
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  net/sched/sch_fq_pie.c | 61 +++++++++++++++++++++++-------------------
>  1 file changed, 34 insertions(+), 27 deletions(-)
> 
> diff --git a/net/sched/sch_fq_pie.c b/net/sched/sch_fq_pie.c

...

> @@ -471,22 +477,23 @@ static int fq_pie_dump(struct Qdisc *sch, struct sk_buff *skb)
>  		return -EMSGSIZE;
>  
>  	/* convert target from pschedtime to us */
> -	if (nla_put_u32(skb, TCA_FQ_PIE_LIMIT, sch->limit) ||
> -	    nla_put_u32(skb, TCA_FQ_PIE_FLOWS, q->flows_cnt) ||

Hi Eric,

I think you missed the corresponding change for q->flows_cnt
in fq_pie_change().

...