netdev - Re: Flows! Offload them.

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Message-ID: <20150226190544.GA1631@casper.infradead.org>
Date:	Thu, 26 Feb 2015 19:05:44 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Jiri Pirko <jiri@...nulli.us>,
	Simon Horman <simon.horman@...ronome.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Neil Horman <nhorman@...driver.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Jesse Gross <jesse@...ira.com>, jpettit@...ira.com,
	Joe Stringer <joestringer@...ira.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Scott Feldman <sfeldma@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	John Linville <linville@...driver.com>, shrijeet@...il.com,
	Andy Gospodarek <gospo@...ulusnetworks.com>, bcrl@...ck.org
Subject: Re: Flows! Offload them.

On 02/26/15 at 10:15am, Tom Herbert wrote:
> But, routing (aka switching) in the stack is not configured through
> TC. We have a whole forwarding and routing infrastructure (eg.
> iproute) with optimizations that  allow routes to be cached in
> sockets, etc. To me, it seems like offloading that basic functionality
> is a prerequisite before attempting to offload more advanced policy
> mechanisms of TC, netfilter, etc.

It is visible that you are coming from container focused world
with sockets on the host ;-) The L3 offload desire comes primiarly
from a VM centric host where decap+L3 offload to a VF allows to
spend zero cycles on the host kernel. I'm not sure if offload
makes sense at all for container workloads w/o VM isolation per
tentant or orch system or something similar.
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