netdev - Re: [PATCH xfrm-next v2 0/6] Extend XFRM core to allow full offload configuration

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Date:   Thu, 18 Aug 2022 16:26:39 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, Raed Salem <raeds@...dia.com>,
        ipsec-devel <devel@...ux-ipsec.org>
Subject: Re: [PATCH xfrm-next v2 0/6] Extend XFRM core to allow full offload
 configuration

On Thu, Aug 18, 2022 at 12:09:30PM +0200, Steffen Klassert wrote:
> Hi Leon,
> 
> On Tue, Aug 16, 2022 at 11:59:21AM +0300, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@...dia.com>
> > 
> > Changelog:
> > v2:
> >  * Rebased to latest 6.0-rc1
> >  * Add an extra check in TX datapath patch to validate packets before
> >    forwarding to HW.
> >  * Added policy cleanup logic in case of netdev down event 
> > v1: https://lore.kernel.org/all/cover.1652851393.git.leonro@nvidia.com 
> >  * Moved comment to be before if (...) in third patch.
> > v0: https://lore.kernel.org/all/cover.1652176932.git.leonro@nvidia.com
> > -----------------------------------------------------------------------
> > 
> > The following series extends XFRM core code to handle new type of IPsec
> > offload - full offload.
> > 
> > In this mode, the HW is going to be responsible for whole data path, so
> > both policy and state should be offloaded.
> 
> some general comments about the pachset:
> 
> As implemented, the software does not hold any state.
> I.e. there is no sync between hardware and software
> regarding stats, liftetime, lifebyte, packet counts
> and replay window. IKE rekeying and auditing is based
> on these, how should this be done?

This is only rough idea as we only started to implement needed
support in libreswan, but our plan is to configure IKE with
highest possible priority 

> 
> I have not seen anything that catches configurations
> that stack multiple tunnels with the outer offloaded.
> 
> Where do we make sure that policy offloading device
> is the same as the state offloading device?

It is configuration error and we don't check it. Should we?

Thanks