[spp] [PATCH 2/3] docs: add experimental commands

[ogawa.yasufumi@lab.ntt.co.jp]

From: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>

Signed-off-by: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
---
 docs/guides/commands/experimental.rst | 122 ++++++++++++++++++++++++++++++++++
 docs/guides/commands/index.rst        |   1 +
 2 files changed, 123 insertions(+)
 create mode 100644 docs/guides/commands/experimental.rst

diff --git a/docs/guides/commands/experimental.rst b/docs/guides/commands/experimental.rst
new file mode 100644
index 0000000..e140263
--- /dev/null
+++ b/docs/guides/commands/experimental.rst
@@ -0,0 +1,122 @@
+..  BSD LICENSE
+    Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+    * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+    * Neither the name of Intel Corporation nor the names of its
+    contributors may be used to endorse or promote products derived
+    from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Experimental Commands
+=====================
+
+There are experimental commands in SPP controller.
+It might not work for some cases properly because it is not well tested
+currently.
+
+topo
+----
+
+Output network topology in several formats.
+
+Support four types of output.
+* terminal (but very few terminals supporting to display images)
+* browser (websocket server is required)
+* image file (jpg, png, bmp)
+* text (dot, json, yaml)
+
+Most used format migth be ``term`` for output an image of network
+configuration in terminal.
+``topo`` command also show an image in a browser.
+
+This command uses `graphviz
+<https://www.graphviz.org/>`_
+for generating topology file and you can
+also generate a dot formatted file directory.
+
+There are some usecases.
+
+.. code-block:: console
+
+    spp > topo term  # terminal
+    spp > topo http  # browser
+    spp > topo network_conf.jpg  # image
+    spp > topo network_conf.dot  # text
+
+
+topo_subgraph
+-------------
+
+``topo_subgraph`` is a supplemental command for manageing subgraphs
+for ``topo``.
+
+Subgraph is a group of object defined in dot language. Grouping objects
+helps your understanding relationship or hierarchy of each of objects.
+For topo command, it is used for grouping resources of each
+of VM or container to topology be more understandable.
+
+For example, add subgraph labeled ``vm1`` for a VM which has two vhost
+interfaces ``VHOST1`` and ``VHOST2``.
+You do not need to use upper case for resource names because
+``topo_subgraph`` command capitalizes given names internally.
+
+.. code-block:: console
+
+    spp > topo_subgraph add vm1 VHOST1;VHOST2  # upper case
+    spp > topo_subgraph add vm1 vhost1;vhost2  # lower case
+
+If VM is shut down and subgraph is not needed anymore,
+delete subgraph 'vm1'.
+
+.. code-block:: console
+
+    spp > topo_subgraph del vm1
+
+To show all of subgraphs, run topo_subgraph without args.
+
+.. code-block:: console
+
+    spp > topo_subgraph
+    label: vm2    subgraph: "VHOST3;VHOST4"
+    label: vm1    subgraph: "VHOST1;VHOST2"
+
+
+load_cmd
+--------
+
+Load a command plugin dynamically while running SPP controller.
+
+
+Plugin file must be placed in ``spp/src/controller/command`` and
+command name must be the same as file name.
+For example, ``hello`` command is loaded from
+``spp/src/controller/command/hello.py``.
+
+.. code-block:: console
+
+    spp > load hello
+    Module 'command.hello' loaded.
+    spp > hello alice
+    Hello, alice!
diff --git a/docs/guides/commands/index.rst b/docs/guides/commands/index.rst
index 7526e68..a8574b6 100644
--- a/docs/guides/commands/index.rst
+++ b/docs/guides/commands/index.rst
@@ -41,3 +41,4 @@ controller.
    primary
    secondary
    common
+   experimental
-- 
2.13.1