[ovs-build] Passed: ovsrobot/ovs#546 (series_94430 - d3207ea)

[Travis CI]

Build Update for ovsrobot/ovs
-------------------------------------

Build: #546
Status: Passed

Duration: 1 hr, 11 mins, and 18 secs
Commit: d3207ea (series_94430)
Author: Anju Thomas
Message: Improved Packet Drop Statistics in OVS

Currently OVS maintains explicit packet drop/error counters only on port
level. Packets that are dropped as part of normal OpenFlow processing are
counted in flow stats of “drop” flows or as table misses in table stats.
These can only be interpreted by controllers that know the semantics of
the configured OpenFlow pipeline. Without that knowledge, it is impossible
for an OVS user to obtain e.g. the total number of packets dropped due to
OpenFlow rules.

Furthermore, there are numerous other reasons for which packets can be
dropped by OVS slow path that are not related to the OpenFlow pipeline.
The generated datapath flow entries include a drop action to avoid further
expensive upcalls to the slow path, but subsequent packets dropped by the
datapath are not accounted anywhere.

Finally, the datapath itself drops packets in certain error situations.
Also, these drops are today not accounted for.

This makes it difficult for OVS users to monitor packet drop in an OVS
instance and to alert a management system in case of a unexpected increase
of such drops. Also OVS trouble-shooters face difficulties in analysing
packet drops.

With this patch we implement following changes to address the issues
mentioned above.

1. Identify and account all the silent packet drop scenarios

2. Display these drops in ovs-appctl coverage/show

A detailed presentation on this was presented at OvS conference 2017 and
link for the corresponding presentation is available at:

https://www.slideshare.net/LF_OpenvSwitch/lfovs17troubleshooting-the-data-plane-in-ovs-82280329

Co-authored-by: Rohith Basavaraja <rohith.basavaraja at gmail.com>
Co-authored-by: Keshav Gupta <keshugupta1 at gmail.com>
Signed-off-by: Anju Thomas <anju.thomas at ericsson.com>
Signed-off-by: Rohith Basavaraja <rohith.basavaraja at gmail.com>
Signed-off-by: Keshav Gupta <keshugupta1 at gmail.com>
Signed-off-by: 0-day Robot <robot at bytheb.org>

View the changeset: https://github.com/ovsrobot/ovs/commit/d3207ea1c4ce

View the full build log and details: https://travis-ci.org/ovsrobot/ovs/builds/499181979?utm_medium=notification&utm_source=email

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