netdev - Re: [PATCH net-next v2] neighbor: fix proxy

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Date:   Mon, 30 Jan 2023 12:13:48 -0500
From:   Brian Haley <haleyb.dev@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2] neighbor: fix proxy_delay usage when it is
 zero

On 1/27/23 2:37 AM, Jakub Kicinski wrote:
> On Wed, 25 Jan 2023 14:51:14 -0500 Brian Haley wrote:
>> +	or proxy_ndp is enabled. A random value between [0, proxy_delay]
> 
> Do you mean: [0, proxy_delay) or there's something that can give us an
> extra jiffy (IOW shouldn't the upper limit be open) ?
> 
> it's
>    random() % MAX - (1 - noise)
> 
> where (1 - noise) is the fraction of jiffy which already passed since
> the tick.
> 
> Sorry if I'm slow to get it..

Yes, it's [0, proxy_delay), should have just copied that right from the 
get_random_u32_below() definition. I'll send a v3 fixing the commit 
message and sysctl doc.

-Brian