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===============
Cmdline example
===============

The cmdline example is a demo example of command line interface in RTE. 
This library is a readline-like interface that can be used to debug your 
RTE application.

It supports some features of GNU readline like completion, cut/paste,
and some other special bindings that makes configuration and debug
faster and easier.

This demo shows how rte_cmdline library can be extended to handle a
list of objects. There are 3 simple commands:

- ``add obj_name IP``: add a new object with an IP/IPv6 address
  associated to it.

- ``del obj_name``: del the specified object.

- ``show obj_name``: show the IP associated with the specified object.

Refer to programmer's guide in ``${RTE_SDK}/doc/rst`` for details.


Prerequisites
=============

Support igb_uio and vfio driver, if used vfio, kernel need 3.6+ and enable vt-d in bios.
When used vfio , used "modprobe vfio" and "modprobe vfio-pci" insmod vfiod driver, then used
"./tools/dpdk_nic_bind.py --bind=vfio-pci device_bus_id" to bind vfio driver to test driver.

Launch the ``cmdline`` with 24 logical cores in linuxapp environment::

  $ ./build/app/cmdline -cffffff

Test the 3 simple commands in below prompt ::
  
  example>


Test Case: cmdline sample commands test
=======================================

Add a test object with an IP address associated to it::
    
  example>add objtest 192.168.0.1
    Object objtest added, ip=192.168.0.1 

Verify the object existance::
        
  example>add objtest 192.168.0.1
    Object objtest already exist

Show the object result by ``show`` command::
  
  example>show objtest
    Object objtest, ip=192.168.0.1

Verify the output matchs the confiuration.

Delete the object in cmdline and show the result again::
        
  example>del objtest
    Object objtest removed, ip=192.168.0.1

Double delete the object to verify the correctness::
  
  example>del objtest
    Bad arguments

Verify no such object exist now.::

  example>show objtest
    Bad arguments

Verify the hidden command ? and help command::
       
  example>help
    Demo example of command line interface in RTE

    This is a readline-like interface that can be used to
    debug your RTE application. It supports some features
    of GNU readline like completion, cut/paste, and some
    other special bindings.

    This demo shows how rte_cmdline library can be
    extended to handle a list of objects. There are
    3 commands:
    - add obj_name IP
    - del obj_name
    - show obj_name

  example>?
    show [Mul-choice STRING]: Show/del an object
    del [Mul-choice STRING]: Show/del an object
    add [Fixed STRING]: Add an object (name, val)
    help [Fixed STRING]: show help

Test Case: cmdline exit test
============================

To verify exit cmdline process::
        
  example>^D

.. there should be an ``quit`` command instead of ^D, 
   or a hint make the user know how to exit.