+++ /dev/null
----
-title: "Design"
-weight: 3
----
-
-# Design
-
-FD.io CSIT system design needs to meet continuously expanding requirements of
-FD.io projects including VPP, related sub-systems (e.g. plugin applications,
-DPDK drivers) and FD.io applications (e.g. DPDK applications), as well as
-growing number of compute platforms running those applications. With CSIT
-project scope and charter including both FD.io continuous testing AND
-performance trending/comparisons, those evolving requirements further amplify
-the need for CSIT framework modularity, flexibility and usability.
-
-## Design Hierarchy
-
-CSIT follows a hierarchical system design with SUTs and DUTs at the bottom level
-of the hierarchy, presentation level at the top level and a number of functional
-layers in-between. The current CSIT system design including CSIT framework is
-depicted in the figure below.
-
-{{< figure src="/cdocs/csit_design_picture.svg" title="CSIT Design" >}}
-
-A brief bottom-up description is provided here:
-
-1. SUTs, DUTs, TGs
- - SUTs - Systems Under Test;
- - DUTs - Devices Under Test;
- - TGs - Traffic Generators;
-2. Level-1 libraries - Robot and Python
- - Lowest level CSIT libraries abstracting underlying test environment, SUT,
- DUT and TG specifics;
- - Used commonly across multiple L2 KWs;
- - Performance and functional tests:
- - L1 KWs (KeyWords) are implemented as RF libraries and Python
- libraries;
- - Performance TG L1 KWs:
- - All L1 KWs are implemented as Python libraries:
- - Support for TRex only today;
- - CSIT IXIA drivers in progress;
- - Performance data plane traffic profiles:
- - TG-specific stream profiles provide full control of:
- - Packet definition - layers, MACs, IPs, ports, combinations thereof
- e.g. IPs and UDP ports;
- - Stream definitions - different streams can run together, delayed,
- one after each other;
- - Stream profiles are independent of CSIT framework and can be used
- in any T-rex setup, can be sent anywhere to repeat tests with
- exactly the same setup;
- - Easily extensible - one can create a new stream profile that meets
- tests requirements;
- - Same stream profile can be used for different tests with the same
- traffic needs;
- - Functional data plane traffic scripts:
- - Scapy specific traffic scripts;
-3. Level-2 libraries - Robot resource files:
- - Higher level CSIT libraries abstracting required functions for executing
- tests;
- - L2 KWs are classified into the following functional categories:
- - Configuration, test, verification, state report;
- - Suite setup, suite teardown;
- - Test setup, test teardown;
-4. Tests - Robot:
- - Test suites with test cases;
- - Performance tests using physical testbed environment:
- - VPP;
- - DPDK-Testpmd;
- - DPDK-L3Fwd;
- - Tools:
- - Documentation generator;
- - Report generator;
- - Testbed environment setup ansible playbooks;
- - Operational debugging scripts;
-
-5. Test Lifecycle Abstraction
-
-A well coded test must follow a disciplined abstraction of the test
-lifecycles that includes setup, configuration, test and verification. In
-addition to improve test execution efficiency, the commmon aspects of
-test setup and configuration shared across multiple test cases should be
-done only once. Translating these high-level guidelines into the Robot
-Framework one arrives to definition of a well coded RF tests for FD.io
-CSIT. Anatomy of Good Tests for CSIT:
-
-1. Suite Setup - Suite startup Configuration common to all Test Cases in suite:
- uses Configuration KWs, Verification KWs, StateReport KWs;
-2. Test Setup - Test startup Configuration common to multiple Test Cases: uses
- Configuration KWs, StateReport KWs;
-3. Test Case - uses L2 KWs with RF Gherkin style:
- - prefixed with {Given} - Verification of Test setup, reading state: uses
- Configuration KWs, Verification KWs, StateReport KWs;
- - prefixed with {When} - Test execution: Configuration KWs, Test KWs;
- - prefixed with {Then} - Verification of Test execution, reading state: uses
- Verification KWs, StateReport KWs;
-4. Test Teardown - post Test teardown with Configuration cleanup and
- Verification common to multiple Test Cases - uses: Configuration KWs,
- Verification KWs, StateReport KWs;
-5. Suite Teardown - Suite post-test Configuration cleanup: uses Configuration
- KWs, Verification KWs, StateReport KWs;
-
-## RF Keywords Functional Classification
-
-CSIT RF KWs are classified into the functional categories matching the test
-lifecycle events described earlier. All CSIT RF L2 and L1 KWs have been grouped
-into the following functional categories:
-
-1. Configuration;
-2. Test;
-3. Verification;
-4. StateReport;
-5. SuiteSetup;
-6. TestSetup;
-7. SuiteTeardown;
-8. TestTeardown;
-
-## RF Keywords Naming Guidelines
-
-Readability counts: "..code is read much more often than it is written."
-Hence following a good and consistent grammar practice is important when
-writing Robot Framework KeyWords and Tests. All CSIT test cases
-are coded using Gherkin style and include only L2 KWs references. L2 KWs are
-coded using simple style and include L2 KWs, L1 KWs, and L1 python references.
-To improve readability, the proposal is to use the same grammar for both
-Robot Framework KW styles, and to formalize the grammar of English
-sentences used for naming the Robot Framework KWs. Robot
-Framework KWs names are short sentences expressing functional description of
-the command. They must follow English sentence grammar in one of the following
-forms:
-
-1. **Imperative** - verb-object(s): *"Do something"*, verb in base form.
-2. **Declarative** - subject-verb-object(s): *"Subject does something"*, verb in
- a third-person singular present tense form.
-3. **Affirmative** - modal_verb-verb-object(s): *"Subject should be something"*,
- *"Object should exist"*, verb in base form.
-4. **Negative** - modal_verb-Not-verb-object(s): *"Subject should not be
- something"*, *"Object should not exist"*, verb in base form.
-
-Passive form MUST NOT be used. However a usage of past participle as an
-adjective is okay. See usage examples provided in the Coding guidelines
-section below. Following sections list applicability of the above
-grammar forms to different Robot Framework KW categories. Usage
-examples are provided, both good and bad.
-
-## Coding Guidelines
-
-Coding guidelines can be found on
-[Design optimizations wiki page](https://wiki.fd.io/view/CSIT/Design_Optimizations).
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