PTF

PTF is a Python based dataplane test framework. It is based on unittest, which is included in the standard Python distribution.

Longer Start

需要先安装的东西：

    Python 2.7Scapypypcap (optional - VLAN tests will fail without this)tcpdump (optional - Scapy will complain if it's missing)

请先安装scapy-vxlan
安装pypcap = 安装flex：the fast lexical analyser + 安装libpcap-1.7.4
Ubuntu安装Tcpdump

We recommend that you install your extension of Scapy, which you can obtain here. It adds support for additional header types: VXLAN, ERSPAN, GENEVE, MPLS and NVGRE.

注意：在执行命令的时候，应注意权限问题(sudo root)。

Install PTF

先fork下来目录：

git clone git@github.com:Wasdns/ptf.git

cd ptf
sudo python setup.py install

如何写ptf程序？

Take a look at the example directory. This is not a working example as it is (the switch is not included), but it will show you how to write tests. This directory contains the following:

    run_client.sh: a wrapper around ptfswitch_sai_thrift: empty directory, this is where the Python bindings to program the switch's control plane would be copiedmytests/sai_base_test.py: a wrapper Python class around PTF's BaseTest class. It is the base class for all the tests we added to mytests/switch.pymytests/switch.py: some example tests

可以在example目录下找到答案。

在安装p4factory的前提下，跑个样例

请先安装p4factory。

First, you need to create the required veths: 先打开虚拟接口

cd $P4FACTORY/tools/
sudo ./veth_setup.sh

注意，这里的$P4FACTORY指的是p4factory的目录。

The next step is to compile the target switch and to run it: 编译一个目的交换机，运行它

cd $P4FACTORY/targets/switch/
make bm-switchsai
sudo ./behavioral-model

Finally, you can run the example tests: 最后可以跑个例子来测试

cd <ptf-dir>/example/
sudo ../ptf --test-dir mytests/ \--pypath $P4FACTORY/targets/switch/tests/pd_thrift/--interface 0@veth1 --interface 1@veth3 --interface 2@veth5 \--interface 3@veth7 --interface 4@veth9 --interface 5@veth11 \--interface 6@veth13 --interface 7@veth15 --interface 8@veth17

这里的指的是ptf的目录。

2016/11/27