[ovs-dev] [PATCH v14 0/7] Add offload support for sFlow

[Chris Mi]

This patch set adds offload support for sFlow.

Psample is a genetlink channel for packet sampling. TC action act_sample
uses psample to send sampled packets to userspace.

When offloading sample action to TC, userspace creates a unique ID to
map sFlow action and tunnel info and passes this ID to kernel instead
of the sFlow info. psample will send this ID and sampled packet to
userspace. Using the ID, userspace can recover the sFlow info and send
sampled packet to the right sFlow monitoring host.

v2-v1:
- Fix robot errors.
v3-v2:
- Remove Gerrit Change-Id.
- Add patch #9 to fix older kernels build issue.
- Add travis test result.
v4-v3:
- Fix offload issue when sampling rate is 1.
v5-v4:
- Move polling thread from ofproto to netdev-offload-tc.
v6-v5:
- Rebase.
- Add GitHub Actions test result.
v7-v6:
- Remove Gerrit Change-Id.
- Fix "ERROR: Inappropriate spacing around cast"
v8-v7
- Address Eelco Chaudron's comment for patch #11.
v9-v8
- Remove sflow_len from struct dpif_sflow_attr.
- Log a debug message for other userspace actions.
v10-v9
- Address Eelco Chaudron's comments on v9.
v11-v10
- Fix a bracing error.
v12-v11
- Add duplicate sample group id check.
v13-v12
- Remove the psample poll thread from netdev-offload-tc and reuse
  ofproto handler thread according to Ilya's new desgin.
- Add dpif-offload-provider layer according to Eli's suggestion.
v14-v13
- Fix a robot error.

Chris Mi (7):
  compat: Add psample and tc sample action defines for older kernels
  ovs-kmod-ctl: Load kernel module psample
  dpif-offload-provider: Introduce dpif-offload-provider layer
  netdev-offload-tc: Introduce group ID management API
  dpif-offload-netlink: Implement dpif-offload-provider API
  ofproto: Introduce API to process sFlow offload packet
  netdev-offload-tc: Add offload support for sFlow

 NEWS                             |   1 +
 include/linux/automake.mk        |   4 +-
 include/linux/psample.h          |  62 ++++
 include/linux/tc_act/tc_sample.h |  25 ++
 lib/automake.mk                  |   3 +
 lib/dpif-netdev.c                |   1 +
 lib/dpif-netlink.c               |   2 +
 lib/dpif-offload-netlink.c       | 210 ++++++++++++++
 lib/dpif-offload-provider.h      |  64 +++++
 lib/dpif-offload.c               |  43 +++
 lib/dpif-provider.h              |   8 +-
 lib/dpif.c                       |  10 +
 lib/netdev-offload-tc.c          | 476 ++++++++++++++++++++++++++++++-
 lib/netdev-offload.h             |   1 +
 lib/tc.c                         |  61 +++-
 lib/tc.h                         |  16 +-
 ofproto/ofproto-dpif-upcall.c    |  57 ++++
 utilities/ovs-kmod-ctl.in        |  14 +
 18 files changed, 1041 insertions(+), 17 deletions(-)
 create mode 100644 include/linux/psample.h
 create mode 100644 include/linux/tc_act/tc_sample.h
 create mode 100644 lib/dpif-offload-netlink.c
 create mode 100644 lib/dpif-offload-provider.h
 create mode 100644 lib/dpif-offload.c

-- 
2.21.0