[ovs-dev] [PATCH V5 00/13] Netdev vxlan-decap offload

Eli Britstein elibr at nvidia.com
Wed Mar 31 12:56:11 UTC 2021

VXLAN decap in OVS-DPDK configuration consists of two flows:
F1: in_port(ens1f0),eth(),ipv4(),udp(), actions:tnl_pop(vxlan_sys_4789)
F2: tunnel(),in_port(vxlan_sys_4789),eth(),ipv4(), actions:ens1f0_0

F1 is a classification flow. It has outer headers matches and it
classifies the packet as a VXLAN packet, and using tnl_pop action the
packet continues processing in F2.
F2 is a flow that has matches on tunnel metadata as well as on the inner
packet headers (as any other flow).

In order to fully offload VXLAN decap path, both F1 and F2 should be
offloaded. As there are more than one flow in HW, it is possible that
F1 is done by HW but F2 is not. Packet is received by SW, and should be
processed starting from F2 as F1 was already done by HW.
Rte_flows are applicable only on physical port IDs. Keeping the original
physical in port on which the packet is received on enables applying
vport flows (e.g. F2) on that physical port.

This patch-set makes use of [1] introduced in DPDK 20.11, that adds API
for tunnel offloads.

Note that MLX5 PMD has a bug that the tnl_pop private actions must be
first. In OVS it is not.
Fixing this issue is scheduled for 21.05 (and stable 20.11.2).
Meanwhile, tests were done with a workaround for it [2].

- Tracking original in_port, and applying vport on that physical port instead of all PFs.
- Traversing ports using a new API instead of flow_dump.
- Refactor packet state recover logic, with bug fix for error pop_header.
- One ref count for netdev in non-tunnel case.
- Rename variables, comments, rebase.
- Extract orig_in_port from physdev for flow modify.
- Miss handling fixes.
- Drop refactor offload rule creation commit.
- Comment about setting in_port in restore.
- Refactor vports flow offload commit.

v1: https://travis-ci.org/github/elibritstein/OVS/builds/756418552
v2: https://travis-ci.org/github/elibritstein/OVS/builds/758382963
v3: https://travis-ci.org/github/elibritstein/OVS/builds/761089087
v4: https://travis-ci.org/github/elibritstein/OVS/builds/763146966
v5: https://travis-ci.org/github/elibritstein/OVS/builds/765271879

GitHub Actions:
v1: https://github.com/elibritstein/OVS/actions/runs/515334647
v2: https://github.com/elibritstein/OVS/actions/runs/554986007
v3: https://github.com/elibritstein/OVS/actions/runs/613226225
v4: https://github.com/elibritstein/OVS/actions/runs/658415274
v5: https://github.com/elibritstein/OVS/actions/runs/704357369

[1] https://mails.dpdk.org/archives/dev/2020-October/187314.html
[2] https://github.com/elibritstein/dpdk-stable/pull/1

Eli Britstein (10):
  netdev-offload: Add HW miss packet state recover API
  netdev-dpdk: Introduce DPDK tunnel APIs
  netdev-offload: Introduce an API to traverse ports
  netdev-dpdk: Add flow_api support for netdev vxlan vports
  netdev-offload-dpdk: Implement HW miss packet recover for vport
  dpif-netdev: Add HW miss packet state recover logic
  netdev-offload-dpdk: Change log rate limits
  netdev-offload-dpdk: Support tunnel pop action
  netdev-offload-dpdk: Support vports flows offload
  netdev-dpdk-offload: Add vxlan pattern matching function

Ilya Maximets (2):
  netdev-offload: Allow offloading to netdev without ifindex.
  netdev-offload: Disallow offloading to unrelated tunneling vports.

Sriharsha Basavapatna (1):
  dpif-netdev: Provide orig_in_port in metadata for tunneled packets

 Documentation/howto/dpdk.rst  |   1 +
 NEWS                          |   2 +
 lib/dpif-netdev.c             |  97 +++--
 lib/netdev-dpdk.c             | 118 ++++++
 lib/netdev-dpdk.h             | 106 ++++-
 lib/netdev-offload-dpdk.c     | 708 +++++++++++++++++++++++++++++++---
 lib/netdev-offload-provider.h |   5 +
 lib/netdev-offload-tc.c       |   8 +
 lib/netdev-offload.c          |  47 ++-
 lib/netdev-offload.h          |  10 +
 lib/packets.h                 |   8 +-
 11 files changed, 1024 insertions(+), 86 deletions(-)


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