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<!DOCTYPE html>
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<title>Distributed Switch Architecture testing</title>
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</head>
<body class="article toc2 toc-left">
<div id="header">
<h1>Distributed Switch Architecture testing</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_getting_started">Getting started</a>
<ul class="sectlevel2">
<li><a href="#_prerequisites">Prerequisites</a></li>
<li><a href="#_installing">Installing</a></li>
<li><a href="#_configuring">Configuring</a></li>
</ul>
</li>
<li><a href="#_running_the_tests">Running the tests</a>
<ul class="sectlevel2">
<li><a href="#_from_the_command_line">From the command line</a></li>
<li><a href="#_from_the_python_api">From the Python API</a></li>
</ul>
</li>
<li><a href="#_authors">Authors</a></li>
<li><a href="#_resources">Resources</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>dsatest is a Linux user space network testing framework for Ethernet switches driven by the kernel space DSA framework.
It provides an extensive list of test cases, a command line to access the test bench and run the tests, as well as a Python API.
It supports many Ethernet switch chips and target machines.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_getting_started">Getting started</h2>
<div class="sectionbody">
<div class="paragraph">
<p>These instructions will get you a copy of the project up and running on your local test bench.</p>
</div>
<div class="sect2">
<h3 id="_prerequisites">Prerequisites</h3>
<div class="paragraph">
<p>The framework depends on <code>python</code>, <code>python-setuptools</code>, and <code>python-paramiko</code>.
dsatest might be compatible with your installation of Python 2.7 with <code>python-configparser</code> as additional dependency.</p>
</div>
</div>
<div class="sect2">
<h3 id="_installing">Installing</h3>
<div class="paragraph">
<p>To get the source code of the dsatest framework, follow these steps:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">git clone git@github.com:netdsa/dsatest.git
cd dsatest/</code></pre>
</div>
</div>
<div class="paragraph">
<p>Ensure that the framework is functional by listing the tests and running the sanity tests:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">./dsatest -l -f bench.cfg.example
./dsatest --dry-run -t sanity -f bench.cfg.example</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_configuring">Configuring</h3>
<div class="paragraph">
<p>Configuration files are usually found in the <code>conf/</code> directory provided with the dsatest package.</p>
</div>
<div class="paragraph">
<p>One can use out-of-tree configuration files by using the <code>-C</code> or <code>--conf-dir</code> flags from the command line.
The specified directory must have the same layout as the default <code>conf/</code> directory.
Files found in this alternate directory will have precedence over the default ones.</p>
</div>
<div class="paragraph">
<p>All configuration files use the INI format.
Three kind of files need to be populated in order to run tests on the bench.
From a bottom-up approach:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">switch</dt>
<dd>
<p>Describe a switch and how its kernel driver exposes some information.
This file can be shared and used in several test benches.
They are located in the <code>switch/</code> configuration directory.</p>
</dd>
<dt class="hdlist1">target</dt>
<dd>
<p>Describe the machine being tested, the switches that are on it, and the interfaces that the test bench will be able to use.
This file can also be shared.
They are located in the <code>target/</code> configuration directory.</p>
</dd>
<dt class="hdlist1">bench</dt>
<dd>
<p>Describe how the host machine and the target machine are connected to one another.
This file is specific to each bench.</p>
</dd>
</dl>
</div>
<div class="sect3">
<h4 id="_switch_configuration_file">Switch configuration file</h4>
<div class="paragraph">
<p>Switch configuration files are located in the <code>switch/</code> subdirectory of the configuration directory.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
Switch configuration files have no properties for the moment.
</td>
</tr>
</table>
</div>
</div>
<div class="sect3">
<h4 id="_target_configuration_file">Target configuration file</h4>
<div class="paragraph">
<p>Target configuration files are located in the <code>target/</code> subdirectory of the configuration directory.
They describe the hardware of the machine being tested.</p>
</div>
<div class="paragraph">
<p>It must have one section per switch chip.
Each indexed switch section must describe the switch model and its enabled links.</p>
</div>
<div class="paragraph">
<p>A target featuring two interconnected switch chips is described as follow:</p>
</div>
<div class="listingblock">
<div class="title">router.cfg</div>
<div class="content">
<pre class="highlight"><code class="language-ini" data-lang="ini">[switch0] ; <b class="conum">(1)</b>
name = "foo-etherswitch" ; <b class="conum">(2)</b>
port0 = link0
port1 = link1
port2 = link2
port3 = link3
[switch1]
name = "foo-etherswitch"
port0 = link4
port1 = link5 ; <b class="conum">(3)</b>
port2 = link6</code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<p>Switch section indexed from 0</p>
</li>
<li>
<p>Refers to a <code>foo-etherswitch.cfg</code> switch configuration file</p>
</li>
<li>
<p>Local switch port to global <em>link</em> mapping</p>
</li>
</ol>
</div>
</div>
<div class="sect3">
<h4 id="_bench_configuration_file">Bench configuration file</h4>
<div class="paragraph">
<p>A bench configuration file describes the test bench, i.e. how the controlling machine (aka host), running dsatest, is connected to the target machine.</p>
</div>
<div class="paragraph">
<p>It must have one section describing the <em>host</em> machine and one section describing the <em>target</em> machine.</p>
</div>
<div class="paragraph">
<p>The purpose of this configuration file is to describe the names of the host and target interfaces connected on both ends of links.</p>
</div>
<div class="paragraph">
<p>An optional <em>control</em> key is used to describe how to access a machine in the form of an URI.
Several control protocols are available.</p>
</div>
<div class="paragraph">
<p>A bench running tests on a target machine via SSH is described as follow:</p>
</div>
<div class="listingblock">
<div class="title">bench.cfg</div>
<div class="content">
<pre class="highlight"><code class="language-ini" data-lang="ini">[host] ; <b class="conum">(1)</b>
link0 = eth1
link1 = eth2
link2 = eth3 ; <b class="conum">(2)</b>
link3 = eth4
[target] ; <b class="conum">(3)</b>
name = router ; <b class="conum">(4)</b>
control = "ssh://target" ; <b class="conum">(5)</b>
;username = foo
;password = bar ; <b class="conum">(6)</b>
link0 = lan0
link1 = lan1
link2 = lan2 ; <b class="conum">(7)</b>
link3 = lan3</code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<p>Host machine section</p>
</li>
<li>
<p>Interface name of a link on host side</p>
</li>
<li>
<p>Target machine section</p>
</li>
<li>
<p>Refers to a <code>router.cfg</code> target configuration file</p>
</li>
<li>
<p>Control to access the target machine</p>
</li>
<li>
<p>Control specific keys</p>
</li>
<li>
<p>Interface name of a link on target side</p>
</li>
</ol>
</div>
<div class="sect4">
<h5 id="_local_control">Local control</h5>
<div class="paragraph">
<p>Run command on the local machine. No configuration key is necessary.
This is the control used by the host machine, which runs the framework.</p>
</div>
</div>
<div class="sect4">
<h5 id="_ssh_control">SSH control</h5>
<div class="paragraph">
<p>Connects to the target machine via SSH.</p>
</div>
<div class="paragraph">
<p>This control requires the <code>ssh://</code> scheme, followed by a hostname and an optional port number.
There is no mandatory key.
Optional <em>username</em>, <em>password</em>, <em>keyfile</em> and <em>system_host_keys</em> keys can be used.</p>
</div>
<div class="paragraph">
<p>Here’s a portion of a <em>target</em> section using the SSH control:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-ini" data-lang="ini">control = "ssh://localhost"
username = bob ; <b class="conum">(1)</b>
password = Secr3t ; <b class="conum">(2)</b>
keyfile = /home/bob/.ssh/id_rsa ; <b class="conum">(3)</b>
system_host_keys = /dev/null ; Don't use system host keys <b class="conum">(4)</b></code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<p>Optional username, defaults to "root"</p>
</li>
<li>
<p>Optional password, defaults to empty</p>
</li>
<li>
<p>Optional alternative key file to use</p>
</li>
<li>
<p>Optional alternative host keys file to use</p>
</li>
</ol>
</div>
</div>
<div class="sect4">
<h5 id="_telnet_control">Telnet control</h5>
<div class="paragraph">
<p>Connects to the target machine via Telnet.</p>
</div>
<div class="paragraph">
<p>This control requires the <code>telnet://</code> scheme, followed by a hostname and an optional port number.
There is no mandatory key.
Optional <em>username</em>, <em>password</em>, and <em>prompt</em> keys can be used.</p>
</div>
<div class="paragraph">
<p>Here’s a portion of a <em>target</em> section using the Telnet control:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-ini" data-lang="ini">control = "telnet://localhost"
username = admin ; <b class="conum">(1)</b>
prompt = "#" ; <b class="conum">(2)</b></code></pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<p>Optional username to use</p>
</li>
<li>
<p>Optional prompt to use</p>
</li>
</ol>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
Take a look at the <a href="example.html">example</a> for a complete test bench.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Copy the example bench configuration file and describe your links and how to control your target.
You may have to provide configuration files for your target and switch(es) if they don’t exist yet.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">cp bench.cfg.example bench.cfg
# edit bench.cfg...</code></pre>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_running_the_tests">Running the tests</h2>
<div class="sectionbody">
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<div class="title">Important</div>
</td>
<td class="content">
You need the <code>NET_CAP_ADMIN</code> capability in order to configure network interfaces.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Test cases are usually found in the <code>tests/</code> directory provided with the dsatest package.</p>
</div>
<div class="paragraph">
<p>One can use out-of-tree test files by using the <code>-T</code> or <code>--test-dir</code> flags from the command line.
The specified directory must have the same layout as the default <code>tests/</code> directory.
Files found in this alternate directory will have precedence over the default ones.</p>
</div>
<div class="sect2">
<h3 id="_from_the_command_line">From the command line</h3>
<div class="paragraph">
<p>By default, the <code>dsatest</code> command runs all the tests found in the test directory.
Run all tests whose method names are prefixed with <strong>test_port_ping</strong>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">./dsatest -t port_ping</code></pre>
</div>
</div>
<div class="paragraph">
<p>For details about command line options, see the help message:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sh" data-lang="sh">./dsatest -h</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_from_the_python_api">From the Python API</h3>
<div class="paragraph">
<p>Tests are written using unittest, and must respect rules defined by this module.
They can access the test bench instance through the following import:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">from dsatest.bench import bench</code></pre>
</div>
</div>
<div class="paragraph">
<p>API is self-documented in the <code>sanity.py</code> test file.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_authors">Authors</h2>
<div class="sectionbody">
<div class="paragraph">
<p>dsatest was written by Damien Riegel and other contributors.
It was inspired by <strong>dsa-tests</strong>, written by Andrew Lunn.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_resources">Resources</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><a href="https://netdsa.github.io/">Project website</a></p>
</li>
<li>
<p><a href="https://github.com/netdsa/dsatest">Git source repository on GitHub</a></p>
</li>
<li>
<p><a href="dsatest.1.html"><code>dsatest</code> man(ual) page</a></p>
</li>
<li>
<p><a href="faq.html">Frequently Asked Questions</a></p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2018-03-16 20:53:27 UTC
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