[ovs-dev] [PATCH v3 0/4] Native tunnel: Update neigh entries in tnl termination.

Paolo Valerio pvalerio at redhat.com
Fri Nov 26 23:12:34 UTC 2021

- added _S suffix to NEIGH_ENTRY_MAX_AGING_TIME (patch #2)
- Added Reported-at tag (patch #4)

- rebased against master
- turned 'ageing' -> 'aging'
- further details of v1 -> v2 respin has been added
  to each patch

The series is composed of the following patches:

#1: Expires is modified in different contexts (revalidator, pmd-rx, bfd-tx).
    It's probably not very racy for many reasons, but it seems a good idea
    to use an atomic here (especially with the introduction of #3).

#2: Introduces the possibility to set and read the entries timeout.
    It's useful for debugging purpose. Includes a self-test.

#3: While performing some tests I noticed unstable timeouts (more
    visible when the ageing time is low) during nd snoop.
    It turned out to be a problem of revalidation. Additional
    details can be found in the commit description.

#4: Fixes a use case in which the tnl neigh entry never
    gets updated (further details in the commit message).
    Includes a self-test.

The use case fixed in #4 could be fixed relaxing the check in
tnl_arp_snoop(), allowing to snoop ARP requests as well, but such
approach could add unneeded entries in the cache.

Paolo Valerio (4):
      Native tunnel: Read/write expires atomically.
      Native tunnel: Add tnl/neigh/aging command.
      Native tunnel: Do not refresh the entry while revalidating.
      Tunnel: Snoop ingress packets and update neigh cache if needed.

 NEWS                            |   2 +
 lib/tnl-neigh-cache.c           | 135 +++++++++++++++++++++++++-------
 lib/tnl-neigh-cache.h           |   4 +-
 ofproto/ofproto-dpif-xlate.c    |  17 +++-
 ofproto/ofproto-tnl-unixctl.man |   9 +++
 tests/tunnel-push-pop-ipv6.at   |  66 ++++++++++++++++
 tests/tunnel-push-pop.at        |  82 +++++++++++++++++++
 7 files changed, 286 insertions(+), 29 deletions(-)

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