Subject: Re: [PATCH net] fq_codel: return non zero qlen in class dumps

From: John Fastabend <[email-masked]>
Date: Tue, 7 Jun 2016 09:03:00 -0700

On 16-06-06 09:12 AM, Eric Dumazet wrote:
> From: Eric Dumazet <[email-masked]>
> 
> We properly scan the flow list to count number of packets,
> but John passed 0 to gnet_stats_copy_queue() so we report
> a zero value to user space instead of the result.
> 
> Fixes: 640158536632 ("net: sched: restrict use of qstats qlen")
> Signed-off-by: Eric Dumazet <[email-masked]>
> Cc: John Fastabend <[email-masked]>
> ---
>  net/sched/sch_fq_codel.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
> index 6883a8971562..7a280360aeed 100644
> --- a/net/sched/sch_fq_codel.c
> +++ b/net/sched/sch_fq_codel.c
> @@ -649,7 +649,7 @@ static int fq_codel_dump_class_stats(struct Qdisc *sch, unsigned long cl,
>  		qs.backlog = q->backlogs[idx];
>  		qs.drops = flow->dropped;
>  	}
> -	if (gnet_stats_copy_queue(d, NULL, &qs, 0) < 0)
> +	if (gnet_stats_copy_queue(d, NULL, &qs, qs.qlen) < 0)
>  		return -1;
>  	if (idx < q->flows_cnt)
>  		return gnet_stats_copy_app(d, &xstats, sizeof(xstats));
> 
> 

Apparently I only passed zero in the sch_fq_codel case, strange. At
the moment I can't think of any reason other than it being a typo.

Thanks for fixing it!

Acked-by: John Fastabend <[email-masked]>