netdev - Re: [PATCH net-next 2/2] net: sched: Lockless Token Bucket (LTB) Qdisc

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Message-ID: <20200706113738.5a5fdf7d@hermes.lan>
Date:   Mon, 6 Jul 2020 11:37:38 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     "YU, Xiangning" <xiangning.yu@...baba-inc.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] net: sched: Lockless Token Bucket (LTB)
 Qdisc

On Tue, 07 Jul 2020 02:08:13 +0800
"YU, Xiangning" <xiangning.yu@...baba-inc.com> wrote:

> +static inline int ltb_drain(struct ltb_class *cl)
> +{
> +	typeof(&cl->drain_queue) queue;
> +	struct sk_buff *skb;
> +	int npkts, bytes;
> +	unsigned long now = NOW();
> +	int cpu;
> +	struct ltb_sched *ltb = qdisc_priv(cl->root_qdisc);
> +	struct ltb_pcpu_sched *pcpu_q;
> +	s64 timestamp;
> +	bool need_watchdog = false;
> +	struct cpumask cpumask;
> +
> +	npkts = 0;
> +	bytes = 0;

It would be safer to use unsigned int for npkts and bytes.
These should never be negative.