netdev - RE: [PATCH ipsec] xfrm: fix non-GRO codepath for IPsec hardware offloading

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Date:   Fri, 4 Jan 2019 10:43:45 +0000
From:   Raed Salem <raeds@...lanox.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>
CC:     Boris Pismenny <borisp@...lanox.com>,
        Yossi Kuperman <yossiku@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [PATCH ipsec] xfrm: fix non-GRO codepath for IPsec hardware
 offloading



> -----Original Message-----
> From: Steffen Klassert [mailto:steffen.klassert@...unet.com]
> Sent: Friday, January 04, 2019 8:34 AM
> To: Raed Salem <raeds@...lanox.com>
> Cc: Boris Pismenny <borisp@...lanox.com>; Yossi Kuperman
> <yossiku@...lanox.com>; netdev@...r.kernel.org;
> herbert@...dor.apana.org.au; davem@...emloft.net
> Subject: Re: [PATCH ipsec] xfrm: fix non-GRO codepath for IPsec hardware
> offloading
> 
> On Thu, Dec 27, 2018 at 01:32:14PM +0000, Raed Salem wrote:
> > In xfrm_input() when called with IPsec hardware offload done and
> > without GRO, encap_type == 0, we end up skipping esp_input_tail as
> > crypto_done is set only within GRO code path, fix by move out
> > crypto_done assignment from the GRO code path and change code
> > accordingly
> 
> We currently don't support IPsec hardware offload without GRO enabled.
> This is because the IPsec hardware offload does not decapsulate the packet.
> So the reverse policy check is done on the outer header instead of the inner
> header for tunnel mode. This means that the reverse policy check will fail for
> almost all tunnel mode configurations. The packet must be decapsulated
> before we do the policy check, and that's not the case without GRO.
> 
> How did you test this?
Used the iproute to configure IPsec hardware offload in transport mode with gro off,
Running traffic using ping