netdev - Re: [ovs-dev] OVS Offload Decision Proposal

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Message-ID: <54F84E21.7030207@mojatatu.com>
Date:	Thu, 05 Mar 2015 07:37:53 -0500
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	John Fastabend <john.fastabend@...il.com>,
	David Miller <davem@...emloft.net>
CC:	therbert@...gle.com, davidch@...adcom.com,
	simon.horman@...ronome.com, dev@...nvswitch.org,
	netdev@...r.kernel.org, pablo@...filter.org
Subject: Re: [ovs-dev] OVS Offload Decision Proposal

On 03/05/15 02:39, John Fastabend wrote:

>
> The intent was to reserve space in the tables for l2, l3, user space,
> and whatever else is needed. This reservation needs to come from the
> administrator because even the kernel doesn't know how much of my
> table space I want to reserve for l2 vs l3 vs tc vs ... The sizing
> of each of these tables will depend on the use case. If I'm provisioning
> L3 networks I may want to create a large l3 table and no 'tc' table.
> If I'm building a firewall box I might want a small l3 table and a
> large 'tc' table. Also depending on how wide I want my matches in the
> 'tc' case I may consume more or less resources in the hardware.
>

Would kernel boot/module options passed to the driver not suffice?
That implies a central authority that decides what these table size
slicing looks like.

> Once the reservation of resources occurs we wouldn't let user space
> arbitrarily write to any table but only tables that have been
> explicitly reserved for user space to write to.
>

How would one allow for a bypass to create tables (a write command)
but not to write to said tables? likely i am missing something
subtle.

cheers,
jamal
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