Here is a joint work from Mellanox and Napatech, to enable the flow hw
offload with the DPDK generic flow interface (rte_flow).

The basic idea is to associate the flow with a mark id (a unit32_t number).
Later, we then get the flow directly from the mark id, which could bypass
some heavy CPU operations, including but not limiting to mini flow extract,
emc lookup, dpcls lookup, etc.

The association is done with CMAP in patch 1. The CPU workload bypassing
is done in patch 2. The flow offload is done in patch 3, which mainly does
two things:

- translate the ovs match to DPDK rte flow patterns
- bind those patterns with a RSS + MARK action.

Patch 5 makes the offload work happen in another thread, for leaving the
datapath as light as possible.

A PHY-PHY forwarding with 1000 mega flows (udp,tp_src=1000-1999) and 1
million streams (tp_src=1000-1999, tp_dst=2000-2999) show more than 260%
performance boost.

Note that it's disabled by default, which can be enabled by:

    $ ovs-vsctl set Open_vSwitch . other_config:hw-offload=true

For Mellanox NICs to be tested with the latest stable 17.11.3.

    - Moved flow mark finding to happen after the next packet prefetch
      and the metadata initialization. This to support with CT action
      and to improve the performance.
    - Don't search for flow mark in re-circulation. This is to address
      the VXLAN issue reported.
    - Set packet offsets as part of the tcp parsing. This is to address
      the VXLAN issue reported.
    - Fixed travis compilation issue.
    - Fixed VLAN flow item to discard the VLAN_CFI bit.
    - Fixed brackets location.
    - rebased on top of master.

    - rebased on top of master.

v9: - introduced IP packet sanity checks in a seperate commit
    - moved structs and enums definition to the begining of the file
    - fixed sparse compilation error (error is assumed to be fixed, issues
      on Travis CI preventing from fully testing it.  

v8: - enhanced documentation with more details on supported protocols
    - fixed VLOG to start with capital letter
    - fixed compilation issues
    - fixed coding style                             
    - addressed the rest of Ian's comments 

v7: - fixed wrong hash for mark_to_flow that has been refactored in v6
    - set the rss_conf for rss action to NULL, to workaround a mlx5 change
      in DPDK v17.11. Note that it will obey the rss settings OVS-DPDK has
      set in the beginning. Thus, nothing should be effected.

v6: - fixed a sparse warning
    - added documentation
    - used hash_int to compute mark to flow hash
    - added more comments
    - added lock for pot lookup
    - rebased on top of the latest code

v5: - fixed an issue that it took too long if we do flow add/remove
    - removed an unused mutex lock
    - turned most of the log level to DBG
    - rebased on top of the latest code

v4: - use RSS action instead of QUEUE action with MARK
    - make it work with multiple queue (see patch 1)
    - rebased on top of latest code

v3: - The mark and id association is done with array instead of CMAP.
    - Added a thread to do hw offload operations
    - Removed macros completely
    - dropped the patch to set FDIR_CONF, which is a workround some
      Intel NICs.
    - Added a debug patch to show all flow patterns we have created.
    - Misc fixes

v2: - workaround the queue action issue
    - fixed the tcp_flags being skipped issue, which also fixed the
      build warnings
    - fixed l2 patterns for Intel nic
    - Converted some macros to functions
    - did not hardcode the max number of flow/action
    - rebased on top of the latest code



Finn Christensen (1):
  netdev-dpdk: implement flow offload with rte flow

Yuanhan Liu (6):
  dpif-netdev: associate flow with a mark id
  flow: Introduce IP packet sanity checks
  dpif-netdev: retrieve flow directly from the flow mark
  netdev-dpdk: add debug for rte flow patterns
  dpif-netdev: do hw flow offload in a thread
  Documentation: document ovs-dpdk flow offload

 Documentation/howto/dpdk.rst |  22 ++
 NEWS                         |   2 +-
 lib/dp-packet.h              |  13 +
 lib/dpif-netdev.c            | 499 +++++++++++++++++++++++++-
 lib/flow.c                   | 168 +++++++--
 lib/flow.h                   |   1 +
 lib/netdev-dpdk.c            | 734 +++++++++++++++++++++++++++++++++++++-
 lib/netdev.h                 |   6 +
 8 files changed, 1405 insertions(+), 40 deletions(-)


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