netdev - Re: [PATCH] packet: Use symmetric hash for PACKET_FANOUT

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Message-ID: <CALx6S37Gn3SL9XucQ8+9MM78TOyEYQHV6bKyCEgQ+trg4e_Xmg@mail.gmail.com>
Date:	Fri, 1 Jul 2016 14:16:54 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	David Miller <davem@...emloft.net>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	eric@...it.org, victor@...iniac.net
Subject: Re: [PATCH] packet: Use symmetric hash for PACKET_FANOUT_HASH.

On Fri, Jul 1, 2016 at 2:07 PM, David Miller <davem@...emloft.net> wrote:
> From: Tom Herbert <tom@...bertland.com>
> Date: Fri, 1 Jul 2016 13:52:58 -0700
>
>> Why are symmetric hashes required?
>
> Because they want load balancing, such that one flow only can overrun
> one single socket not all of the ones in the fanout.
>
I'm still missing it. Why is this any different than what we need with
something like SO_REUSEPORT?

> Every single user of AF_PACKET fanout wants this behavior.