[dpdk-dev] [PATCH 3/4] ethdev: add Rx offload outer L4 checksum definitions

[Shahaf Shuler]

Friday, September 14, 2018 6:06 AM, Jerin Jacob:
> Subject: Re: [dpdk-dev] [PATCH 3/4] ethdev: add Rx offload outer L4
> checksum definitions
> 
> -----Original Message-----
> > Date: Thu, 13 Sep 2018 17:24:26 +0000
> > From: Shahaf Shuler <shahafs at mellanox.com>
> > To: Jerin Jacob <jerin.jacob at caviumnetworks.com>, Wenzhuo Lu
> > <wenzhuo.lu at intel.com>, Jingjing Wu <jingjing.wu at intel.com>, Bernard
> > Iremonger <bernard.iremonger at intel.com>, John McNamara
> > <john.mcnamara at intel.com>, Marko Kovacevic
> > <marko.kovacevic at intel.com>,  Thomas Monjalon
> <thomas at monjalon.net>,
> > Ferruh Yigit  <ferruh.yigit at intel.com>, Andrew Rybchenko
> > <arybchenko at solarflare.com>,  Olivier Matz <olivier.matz at 6wind.com>
> > CC: "dev at dpdk.org" <dev at dpdk.org>
> > Subject: RE: [dpdk-dev] [PATCH 3/4] ethdev: add Rx offload outer L4
> > checksum definitions
> >
> >
> > Thursday, September 13, 2018 4:47 PM, Jerin Jacob:
> > > Subject: [dpdk-dev] [PATCH 3/4] ethdev: add Rx offload outer L4
> > > checksum definitions
> > >
> > > Introduced DEV_RX_OFFLOAD_OUTER_UDP_CKSUM,
> > > DEV_RX_OFFLOAD_OUTER_TCP_CKSUM and
> DEV_RX_OFFLOAD_OUTER_SCTP_CKSUM
> > > offload flags and
> >
> > Out of curiosity, which TCP based tunnels you target with this current
> patchset?
> 
> I am not aware of any _popular_/_non proprietary_  protocols except SSTP
> for VPN.

And your device can support such protocol inner and outer checksum check?
>From what I see the inner packet of SSTP is encrypted by SSL.

So for outer and inner checksum validation device will need to:
1. compute the outer TCP checksum
2. if valid decrypt the inner PPP packet
3. compute the PPP checksum.