netdev - Re: [PATCH iproute2] htb: support 64bit rates

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Message-ID: <528483CE.6050100@huawei.com>
Date:	Thu, 14 Nov 2013 16:03:26 +0800
From:	Yang Yingliang <yangyingliang@...wei.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Stephen Hemminger <stephen@...workplumber.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2] htb: support 64bit rates

On 2013/11/13 22:21, Eric Dumazet wrote:
> On Wed, 2013-11-13 at 17:11 +0800, Yang Yingliang wrote:
>>> -	if (!buffer) buffer = opt.rate.rate / get_hz() + mtu;
>>> -	if (!cbuffer) cbuffer = opt.ceil.rate / get_hz() + mtu;
>>> +	if (!buffer)
>>> +		buffer = rate64 / get_hz() + mtu;
>>> +	if (!cbuffer)
>>> +		cbuffer = ceil64 / get_hz() + mtu;
>>
>> Hi,
>> It may overflow here if rate64 and mtu are big enough.
> 
> Not really.
> 
> get_hz() on current kernels is really huge : 1000000000

Yeah, in normal condition, it won't happen.
If user make a wrong input, such as "rate 0x800000000Gbit",
Overflow happens. Although it has no impact on the value of the "opt.buffer".
If it's better to have a judgement of the buffer's value. :)

Regards,
Yang

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