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Date: Wed, 22 Jul 2015 10:58:24 +0200 From: <thomas.morin@...nge.com> To: Thomas Graf <tgraf@...g.ch>, <roopa@...ulusnetworks.com>, <rshearma@...cade.com>, <ebiederm@...ssion.com>, <hannes@...essinduktion.org>, <pshelar@...ira.com>, <jesse@...ira.com>, <davem@...emloft.net>, <daniel@...earbox.net>, <tom@...bertland.com>, <edumazet@...gle.com>, <jiri@...nulli.us>, <marcelo.leitner@...il.com>, <stephen@...workplumber.org>, <jpettit@...ira.com>, <kaber@...sh.net>, <simon.horman@...ronome.com>, <joestringer@...ira.com>, <ja@....bg>, <ast@...mgrid.com>, <weichunc@...mgrid.com> CC: <dev@...nvswitch.org>, <netdev@...r.kernel.org> Subject: Re: [ovs-dev] [PATCH net-next 00/22 v2] Lightweight & flow based encapsulation Hi Thomas, This looks promising. One question: will this approach allow MPLS-in-GRE and MPLS-in-UDP ? -Thomas 2015-07-21, Thomas Graf: > This series combines the work previously posted by Roopa, Robert and > myself. It's according to what we discussed at NFWS. The motivation > of this series is to: > > * Consolidate code between OVS and the rest of the kernel and get > rid of OVS vports and instead represent them as pure net_devices. > * Introduce a lightweight tunneling mechanism which enables flow > based encapsulation to improve scalability on both RX and TX. > * Do the above in an encapsulation unspecific way so that the > encapsulation type is eventually abstracted away from the user. > * Use the same forwarding decision for both native forwarding and > encapsulation thus allowing to switch between native IPv6 and > UDP encapsulation based on endpoint without requiring additional > logic > > The fundamental changes introduces in this series are: > * A new RTA_ENCAP Netlink attribute for routes carrying encapsulation > instructions. Depending on the specified type, the instructions > apply to UDP encapsulations, MPLS and possible other in the future. > * Depending on the encapsulation type, the output function of the > dst is directly overwritten or the dst merely attaches metadata and > relies on a subsequent net_device to apply it to the packet. The > latter is typically used if an inner and outer IP header exist which > require two subsequent routing lookups to be performed. > * A new metadata_dst structure which can be attached to skbs to > carry metadata in between subsystems. This new metadata transport > is used to provide a single interface for VXLAN, routing and OVS > to communicate through metadata. > > The OVS interfaces remain as-is but will transparently create a real > VXLAN net_device in the background. iproute2 is extended with a new > use cases: > > VXLAN: > ip route add 40.1.1.1/32 encap vxlan id 10 dst 50.1.1.2 dev vxlan0 > > MPLS: > ip route add 10.1.1.0/30 encap mpls 200 via inet 10.1.1.1 dev swp1 > > Performance implications: > The additional memory allocation in the receive path should have > performance implications although it is not observable in standard > throughput tests if GRO is properly done. The correct net_device > model outweights the additional cost of the allocation. Furthermore, > this implication can be relaxed by reintroducing a direct unqueued > path from a software device to a consumer like bridge or OVS if > needed. > > $ netperf -t TCP_STREAM -H 15.1.1.201 > MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to > 15.1.1.201 (15.1.1.201) port 0 AF_INET : demo > Recv Send Send > Socket Socket Message Elapsed > Size Size Size Time Throughput > bytes bytes bytes secs. 10^6bits/sec > > 87380 16384 16384 10.00 9118.17 > > Changes since v1: > * Properly initialize tun_id as reported by Julian > * Drop dupliate netif_keep_dst() as reported by Alexei > > Roopa Prabhu (9): > rtnetlink: introduce new RTA_ENCAP_TYPE and RTA_ENCAP attributes > lwtunnel: infrastructure for handling light weight tunnels like mpls > ipv4: support for fib route lwtunnel encap attributes > ipv6: support for fib route lwtunnel encap attributes > lwtunnel: support dst output redirect function > ipv4: redirect dst output to lwtunnel output > ipv6: rt6_info output redirect to tunnel output > mpls: export mpls functions for use by mpls iptunnels > mpls: ip tunnel support > > Thomas Graf (13): > ip_tunnel: Make ovs_tunnel_info and ovs_key_ipv4_tunnel generic > icmp: Don't leak original dst into ip_route_input() > dst: Metadata destinations > arp: Inherit metadata dst when creating ARP requests > vxlan: Flow based tunneling > route: Extend flow representation with tunnel key > route: Per route IP tunnel metadata via lightweight tunnel > fib: Add fib rule match on tunnel id > vxlan: Factor out device configuration > openvswitch: Make tunnel set action attach a metadata dst > openvswitch: Move dev pointer into vport itself > openvswitch: Abstract vport name through ovs_vport_name() > openvswitch: Use regular VXLAN net_device device > > drivers/net/vxlan.c | 672 +++++++++++++++++++++-------------- > include/linux/lwtunnel.h | 6 + > include/linux/mpls_iptunnel.h | 6 + > include/linux/skbuff.h | 1 + > include/net/dst.h | 6 +- > include/net/dst_metadata.h | 55 +++ > include/net/fib_rules.h | 1 + > include/net/flow.h | 8 + > include/net/ip6_fib.h | 3 + > include/net/ip_fib.h | 5 +- > include/net/ip_tunnels.h | 95 ++++- > include/net/lwtunnel.h | 144 ++++++++ > include/net/mpls_iptunnel.h | 29 ++ > include/net/route.h | 1 + > include/net/rtnetlink.h | 1 + > include/net/vxlan.h | 85 ++++- > include/uapi/linux/fib_rules.h | 2 +- > include/uapi/linux/if_link.h | 1 + > include/uapi/linux/lwtunnel.h | 16 + > include/uapi/linux/mpls_iptunnel.h | 28 ++ > include/uapi/linux/openvswitch.h | 2 +- > include/uapi/linux/rtnetlink.h | 17 + > net/Kconfig | 7 + > net/core/Makefile | 1 + > net/core/dev.c | 2 +- > net/core/dst.c | 84 ++++- > net/core/fib_rules.c | 24 +- > net/core/lwtunnel.c | 235 ++++++++++++ > net/core/rtnetlink.c | 26 +- > net/ipv4/arp.c | 65 ++-- > net/ipv4/fib_frontend.c | 10 + > net/ipv4/fib_semantics.c | 96 ++++- > net/ipv4/icmp.c | 1 + > net/ipv4/ip_input.c | 3 +- > net/ipv4/ip_tunnel_core.c | 130 +++++++ > net/ipv4/route.c | 28 +- > net/ipv6/ip6_fib.c | 2 + > net/ipv6/route.c | 34 +- > net/mpls/Kconfig | 8 +- > net/mpls/Makefile | 1 + > net/mpls/af_mpls.c | 11 +- > net/mpls/internal.h | 9 +- > net/mpls/mpls_iptunnel.c | 233 ++++++++++++ > net/openvswitch/Kconfig | 12 - > net/openvswitch/Makefile | 1 - > net/openvswitch/actions.c | 12 +- > net/openvswitch/datapath.c | 19 +- > net/openvswitch/datapath.h | 5 +- > net/openvswitch/dp_notify.c | 5 +- > net/openvswitch/flow.c | 4 +- > net/openvswitch/flow.h | 79 +--- > net/openvswitch/flow_netlink.c | 84 ++++- > net/openvswitch/flow_netlink.h | 3 +- > net/openvswitch/flow_table.c | 4 +- > net/openvswitch/vport-geneve.c | 17 +- > net/openvswitch/vport-gre.c | 16 +- > net/openvswitch/vport-internal_dev.c | 38 +- > net/openvswitch/vport-netdev.c | 289 ++++++++++++--- > net/openvswitch/vport-netdev.h | 13 - > net/openvswitch/vport-vxlan.c | 322 ----------------- > net/openvswitch/vport-vxlan.h | 11 - > net/openvswitch/vport.c | 34 +- > net/openvswitch/vport.h | 21 +- > 63 files changed, 2231 insertions(+), 952 deletions(-) > create mode 100644 include/linux/lwtunnel.h > create mode 100644 include/linux/mpls_iptunnel.h > create mode 100644 include/net/dst_metadata.h > create mode 100644 include/net/lwtunnel.h > create mode 100644 include/net/mpls_iptunnel.h > create mode 100644 include/uapi/linux/lwtunnel.h > create mode 100644 include/uapi/linux/mpls_iptunnel.h > create mode 100644 net/core/lwtunnel.c > create mode 100644 net/mpls/mpls_iptunnel.c > delete mode 100644 net/openvswitch/vport-vxlan.c > delete mode 100644 net/openvswitch/vport-vxlan.h > _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. 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