[ovs-dev] [PATCH v4 0/5] OVS-DPDK flow offload with rte_flow

[Yuanhan Liu]

Hi,

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


v4: - use RSS action instead of QUEUE action with MARK
    - make it work with multiple queue (see patch 1)
    - rebase 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

Thanks.

    --yliu

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

Yuanhan Liu (4):
  dpif-netdev: associate flow with a mark id
  dpif-netdev: retrieve flow directly from the flow mark
  netdev-dpdk: add debug for rte flow patterns
  dpif-netdev: do hw flow offload in another thread

 lib/dp-packet.h   |  13 +
 lib/dpif-netdev.c | 481 +++++++++++++++++++++++++++++++++++-
 lib/flow.c        | 155 +++++++++---
 lib/flow.h        |   1 +
 lib/netdev-dpdk.c | 726 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 lib/netdev.h      |   6 +
 6 files changed, 1343 insertions(+), 39 deletions(-)

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2.7.4