netdev - RE: [RFC PATCH net-next 0/5] ice: L2TPv3 offload support

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Date:   Fri, 26 Aug 2022 11:36:55 +0000
From:   "Drewek, Wojciech" <wojciech.drewek@...el.com>
To:     Jiri Pirko <jiri@...nulli.us>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Lobakin, Alexandr" <alexandr.lobakin@...el.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "jhs@...atatu.com" <jhs@...atatu.com>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
        "marcin.szycik@...ux.intel.com" <marcin.szycik@...ux.intel.com>,
        "michal.swiatkowski@...ux.intel.com" 
        <michal.swiatkowski@...ux.intel.com>,
        "kurt@...utronix.de" <kurt@...utronix.de>,
        "boris.sukholitko@...adcom.com" <boris.sukholitko@...adcom.com>,
        "vladbu@...dia.com" <vladbu@...dia.com>,
        "komachi.yoshiki@...il.com" <komachi.yoshiki@...il.com>,
        "paulb@...dia.com" <paulb@...dia.com>,
        "baowen.zheng@...igine.com" <baowen.zheng@...igine.com>,
        "louis.peens@...igine.com" <louis.peens@...igine.com>,
        "simon.horman@...igine.com" <simon.horman@...igine.com>,
        "pablo@...filter.org" <pablo@...filter.org>,
        "maksym.glubokiy@...ision.eu" <maksym.glubokiy@...ision.eu>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "jchapman@...alix.com" <jchapman@...alix.com>,
        "gnault@...hat.com" <gnault@...hat.com>
Subject: RE: [RFC PATCH net-next 0/5] ice: L2TPv3 offload support



> -----Original Message-----
> From: Jiri Pirko <jiri@...nulli.us>
> Sent: piątek, 26 sierpnia 2022 13:16
> To: Drewek, Wojciech <wojciech.drewek@...el.com>
> Cc: netdev@...r.kernel.org; Lobakin, Alexandr <alexandr.lobakin@...el.com>; Brandeburg, Jesse <jesse.brandeburg@...el.com>;
> Nguyen, Anthony L <anthony.l.nguyen@...el.com>; davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; jhs@...atatu.com; xiyou.wangcong@...il.com; marcin.szycik@...ux.intel.com;
> michal.swiatkowski@...ux.intel.com; kurt@...utronix.de; boris.sukholitko@...adcom.com; vladbu@...dia.com;
> komachi.yoshiki@...il.com; paulb@...dia.com; baowen.zheng@...igine.com; louis.peens@...igine.com;
> simon.horman@...igine.com; pablo@...filter.org; maksym.glubokiy@...ision.eu; intel-wired-lan@...ts.osuosl.org;
> jchapman@...alix.com; gnault@...hat.com
> Subject: Re: [RFC PATCH net-next 0/5] ice: L2TPv3 offload support
> 
> Fri, Aug 26, 2022 at 01:00:54PM CEST, wojciech.drewek@...el.com wrote:
> >Add support for dissecting L2TPv3 session id in flow dissector. Add support
> >for this field in tc-flower and support offloading L2TPv3. Finally, add
> >support for hardware offload of L2TPv3 packets based on session id in
> >switchdev mode in ice driver.
> >
> >Example filter:
> >  # tc filter add dev $PF1 ingress prio 1 protocol ip \
> >      flower \
> >        ip_proto l2tp \
> >        l2tpv3_sid 1234 \
> >        skip_sw \
> >      action mirred egress redirect dev $VF1_PR
> >
> >Changes in iproute2 are required to use the new fields.
> >
> >ICE COMMS DDP package is required to create a filter in ice.
> 
> I don't understand what do you mean by this. Could you please explain
> what this mysterious "ICE COMMS DDP package" is? Do I understand it
> correctly that without it, the solution would not work?

Sorry, I'll include more precise description in the next version.
DDP (Dynamic Device Personalization) is a firmware package that contains definitions
protocol's headers and packets. It allows you  to add support for the new protocol to the
NIC card without rebooting.  If the DDP package does not support L2TPv3 then hw offload 
will not work, however sw offload will still work.

More info on DDP:
https://www.intel.com/content/www/us/en/architecture-and-technology/ethernet/dynamic-device-personalization-brief.html

> 
> >
> >Marcin Szycik (1):
> >  ice: Add L2TPv3 hardware offload support
> >
> >Wojciech Drewek (4):
> >  uapi: move IPPROTO_L2TP to in.h
> >  flow_dissector: Add L2TPv3 dissectors
> >  net/sched: flower: Add L2TPv3 filter
> >  flow_offload: Introduce flow_match_l2tpv3
> >
> > .../ethernet/intel/ice/ice_protocol_type.h    |  8 +++
> > drivers/net/ethernet/intel/ice/ice_switch.c   | 70 ++++++++++++++++++-
> > drivers/net/ethernet/intel/ice/ice_tc_lib.c   | 27 ++++++-
> > drivers/net/ethernet/intel/ice/ice_tc_lib.h   |  6 ++
> > include/net/flow_dissector.h                  |  9 +++
> > include/net/flow_offload.h                    |  6 ++
> > include/uapi/linux/in.h                       |  2 +
> > include/uapi/linux/l2tp.h                     |  2 -
> > include/uapi/linux/pkt_cls.h                  |  2 +
> > net/core/flow_dissector.c                     | 28 ++++++++
> > net/core/flow_offload.c                       |  7 ++
> > net/sched/cls_flower.c                        | 16 +++++
> > 12 files changed, 179 insertions(+), 4 deletions(-)
> >
> >--
> >2.31.1
> >