[ovs-dev] [PATCH ovn] Documentation: add a quick start for prospective contributors

Numan Siddique numans at ovn.org
Mon Jun 8 14:35:49 UTC 2020


On Fri, May 22, 2020 at 8:54 PM Gabriele Cerami <gcerami at redhat.com> wrote:

> This change adds a small guide that may be useful to prospective
> contributors that start from scratch.
>
> Signed-off-by: Gabriele Cerami <gcerami at redhat.com>
>

Thanks for the patch and improving the OVN documentation.

I see a few "WIP". Do you plan to address them and send v2 ?

Thanks
Numan


> ---
>  Documentation/internals/contributing/index.rst     |   1 +
>  .../internals/contributing/quickstart.rst          | 202
> +++++++++++++++++++++
>  2 files changed, 203 insertions(+)
>  create mode 100644 Documentation/internals/contributing/quickstart.rst
>
> diff --git a/Documentation/internals/contributing/index.rst
> b/Documentation/internals/contributing/index.rst
> index 77b52964b..fafc530b6 100644
> --- a/Documentation/internals/contributing/index.rst
> +++ b/Documentation/internals/contributing/index.rst
> @@ -30,6 +30,7 @@ The below guides provide information on contributing to
> OVN itself.
>  .. toctree::
>     :maxdepth: 2
>
> +   quickstart
>     submitting-patches
>     backporting-patches
>     coding-style
> diff --git a/Documentation/internals/contributing/quickstart.rst
> b/Documentation/internals/contributing/quickstart.rst
> new file mode 100644
> index 000000000..9f6870360
> --- /dev/null
> +++ b/Documentation/internals/contributing/quickstart.rst
> @@ -0,0 +1,202 @@
> +..
> +      Licensed under the Apache License, Version 2.0 (the "License"); you
> may
> +      not use this file except in compliance with the License. You may
> obtain
> +      a copy of the License at
> +
> +          http://www.apache.org/licenses/LICENSE-2.0
> +
> +      Unless required by applicable law or agreed to in writing, software
> +      distributed under the License is distributed on an "AS IS" BASIS,
> WITHOUT
> +      WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
> See the
> +      License for the specific language governing permissions and
> limitations
> +      under the License.
> +
> +      Convention for heading levels in OVN documentation:
> +
> +      =======  Heading 0 (reserved for the title in a document)
> +      -------  Heading 1
> +      ~~~~~~~  Heading 2
> +      +++++++  Heading 3
> +      '''''''  Heading 4
> +
> +      Avoid deeper levels because they do not render well.
> +
> +==============================================
> +Simple steps if you want to start from scratch
> +==============================================
> +
> +This is a quick reference document on some steps a contributor could make
> +to ramp up more quickly with knowledge and unstanding of OVN
> +
> +Understand the Architecture
> +---------------------------
> +
> +Take a look at the overall architecture first.
> +
> +High level Overview
> +~~~~~~~~~~~~~~~~~~~
> +
> +This video is from 2016 but content is still relevant and it gives a quick
> +overview of the various components.
> +
> +`OVN introduction <https://www.youtube.com/watch?v=q3cJ6ezPnCU>`_.
> +
> +
> +In depth architecture
> +~~~~~~~~~~~~~~~~~~~~~
> +
> +You may want to dive deeper in the architecture after.
> +
> +Look at
> +`OVN architecture <
> http://www.openvswitch.org/support/dist-docs/ovn-architecture.7.pdf>`_.
> +
> +or from ovn repo root:
> +
> +::
> +
> +  nroff -man ovn-architecture.7 | less
> +
> +Ovsdb
> +~~~~~
> +
> +The role of ovsdb is central for any activity on ovn. Understand at least
> the data model,
> +the schemas, and the monitoring.
> +
> +`OVSDB documentation <http://docs.openvswitch.org/en/latest/ref/ovsdb.7/
> >`_.
> +
> +
> +Set a goal for yourself
> +-----------------------
> +
> +Before proceeding further it may be important to set an achievable goal
> +to give a direction to your study.
> +Join the weekly meeting, present yourself and ask for things to do
> +
> +
> +Study the code
> +--------------
> +
> +Knowing the overall architecture it's not difficult to map the components
> +to the source in the tree, but there may be some abbreviations not
> immediately familiar.
> +
> +Glossary
> +~~~~~~~~
> +
> +:sbrec/nbrec:
> +  record on southbound/northbound database
> +
> +:ic:
> +  interconnection controller
> +
> +:idl:
> +   Interface Definition Language. Structures related to the idl help
> +   maintain in-memory replicas of OVSDB instances.
> +
> +:hmap/smap:
> +   Hash map implementations that ... ???
> +
> +Data Structures
> +~~~~~~~~~~~~~~~
> +
> +Keep a tab opened to data structures implementation, and keep in mind
> that many may
> +still be imported from ovs repo.
> +
> +An example of flow with reference to the code
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +How a change in the nb database from the cloud plugin becomes a set of
> +rules in the ovs switch ?
> +
> +1. The northd receives notification of a record from northbound database
> +
> +  1.1 northd/ovs_northd.c:??? handles the notification.
> +
> +2. ???
> +3. ???
> +
> +
> +
> +Hands-on
> +--------
> +
> +Quick Start
> +~~~~~~~~~~~
> +
> +::
> +
> +  git clone  https://github.com/openvswitch/ovs
> +  pushd ovs
> +  ./boot.sh ; ./configure ; make
> +  popd
> +
> +  git clone https://github.com/ovn-org/ovn
> +  ./boot.sh ; ./configure --with-ovs-source=../ovs ; make
> +  popd
> +
> +
> +Playgrounds
> +~~~~~~~~~~~
> +
> +To do some experiments, there are a few method at disposal:
> +
> +A simple non isolated OVS bridge controlled by OVN can be easily created
> with
> +
> +::
> +
> +  pushd ovn
> +  make sandbox
> +
> +
> +to create a larger playground wtih multiple bridges in multiple nodes,
> +look at `OVN fake multinode <
> https://github.com/ovn-org/ovn-fake-multinode>`_. repo
> +
> +Tests
> +------
> +
> +The test suite is run with the help of autotest.
> +
> +Types of tests
> +~~~~~~~~~~~~~~
> +
> +:component:
> +  WIP
> +
> +:end to end:
> +  WIP
> +
> +Create a test
> +~~~~~~~~~~~~~
> +
> +1. ???
> +2. Ensure description is present in at_help_all var in tests/testsuite
> +3. ???
> +
> +Branching Model
> +---------------
> +
> +WIP
> +
> +Your first submission
> +---------------------
> +
> +Before submitting your patch, review
> :doc:`internals/contributin/submitting-patches`
> +
> +::
> +
> +  git checkout -b my-first-patch
> +
> +
> +Modify the code. then.
> +
> +::
> +
> +  git commit -a --signoff
> +  git format-patch master --prefix "[PATCH ovn - my first patch]"
> +
> +edit the .patch file with tags.
> +
> +::
> +
> +  git send-email --smtp-server=your.smtp.server *.patch
> +
> +
> --
> 2.11.0
>
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