docs: pin down sphinx to avoid crash with Sphinx 3.0.0

The vpp-make-test-docs-verify jobs started to fail. The last successful run of it shows:

reating file /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api/vpp_vxlan_gbp_tunnel.rst.
Creating file /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api/vpp_vxlan_tunnel.rst.
Creating file /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api/vrf.rst.
Creating file /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api/modules.rst.
sphinx-build -b html -d /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/.sphinx-cache  /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api -c /w/workspace/vpp-make-test-docs-verify-master/test/doc /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/html
Running Sphinx v2.4.4
making output directory... done
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 161 source files that are out of date
updating environment: [new config] 161 added, 0 changed, 0 removed
reading sources... [  0%] bfd
reading sources... [  1%] debug
reading sources... [  1%] debug_internal
reading sources... [  2%] discover_tests

The failing jobs show:

Creating file /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api/vpp_vxlan_tunnel.rst.
Creating file /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api/vrf.rst.
Creating file /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api/modules.rst.
sphinx-build -b html -d /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/.sphinx-cache  /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/api -c /w/workspace/vpp-make-test-docs-verify-master/test/doc /w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc/html
Running Sphinx v3.0.0
making output directory... done
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 161 source files that are out of date
updating environment: [new config] 161 added, 0 changed, 0 removed
reading sources... [  0%] bfd

Exception occurred:
  File "/usr/lib/python3.6/inspect.py", line 516, in unwrap
    raise ValueError('wrapper loop when unwrapping {!r}'.format(f))
ValueError: wrapper loop when unwrapping scapy.fields.BitEnumField
The full traceback has been saved in /tmp/sphinx-err-n84dadfq.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
Makefile:39: recipe for target 'html' failed
make[2]: *** [html] Error 2
make[2]: Leaving directory '/w/workspace/vpp-make-test-docs-verify-master/test/doc'
Makefile:274: recipe for target '/w/workspace/vpp-make-test-docs-verify-master/build-root/build-test/doc' failed

Type: fix

Change-Id: Id98c0f94104e455ea819aacec62f605e53db13ce
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2 files changed
tree: 887c318070b37829e97c91a4ba3b2861e8eecfbf
  1. build/
  2. build-data/
  3. build-root/
  4. docs/
  5. doxygen/
  6. extras/
  7. gmod/
  8. src/
  9. test/
  10. .clang-format
  11. .git_commit_template.txt
  12. .gitignore
  13. .gitreview
  14. INFO.yaml
  15. LICENSE
  16. MAINTAINERS
  17. Makefile
  18. README.md
  19. RELEASE.md
README.md

Vector Packet Processing

Introduction

The VPP platform is an extensible framework that provides out-of-the-box production quality switch/router functionality. It is the open source version of Cisco's Vector Packet Processing (VPP) technology: a high performance, packet-processing stack that can run on commodity CPUs.

The benefits of this implementation of VPP are its high performance, proven technology, its modularity and flexibility, and rich feature set.

For more information on VPP and its features please visit the FD.io website and What is VPP? pages.

Changes

Details of the changes leading up to this version of VPP can be found under @ref release_notes.

Directory layout

Directory nameDescription
build-dataBuild metadata
build-rootBuild output directory
doxygenDocumentation generator configuration
dpdkDPDK patches and build infrastructure
@ref extras/libmemifClient library for memif
@ref src/examplesVPP example code
@ref src/pluginsVPP bundled plugins directory
@ref src/svmShared virtual memory allocation library
src/testsStandalone tests (not part of test harness)
src/vatVPP API test program
@ref src/vlibVPP application library
@ref src/vlibapiVPP API library
@ref src/vlibmemoryVPP Memory management
@ref src/vnetVPP networking
@ref src/vppVPP application
@ref src/vpp-apiVPP application API bindings
@ref src/vppinfraVPP core library
@ref src/vpp/apiNot-yet-relocated API bindings
testUnit tests and Python test harness

Getting started

In general anyone interested in building, developing or running VPP should consult the VPP wiki for more complete documentation.

In particular, readers are recommended to take a look at [Pulling, Building, Running, Hacking, Pushing](https://wiki.fd.io/view/VPP/Pulling,_Building,_Run ning,_Hacking_and_Pushing_VPP_Code) which provides extensive step-by-step coverage of the topic.

For the impatient, some salient information is distilled below.

Quick-start: On an existing Linux host

To install system dependencies, build VPP and then install it, simply run the build script. This should be performed a non-privileged user with sudo access from the project base directory:

./extras/vagrant/build.sh

If you want a more fine-grained approach because you intend to do some development work, the Makefile in the root directory of the source tree provides several convenience shortcuts as make targets that may be of interest. To see the available targets run:

make

Quick-start: Vagrant

The directory extras/vagrant contains a VagrantFile and supporting scripts to bootstrap a working VPP inside a Vagrant-managed Virtual Machine. This VM can then be used to test concepts with VPP or as a development platform to extend VPP. Some obvious caveats apply when using a VM for VPP since its performance will never match that of bare metal; if your work is timing or performance sensitive, consider using bare metal in addition or instead of the VM.

For this to work you will need a working installation of Vagrant. Instructions for this can be found [on the Setting up Vagrant wiki page] (https://wiki.fd.io/view/DEV/Setting_Up_Vagrant).

More information

Several modules provide documentation, see @subpage user_doc for more end-user-oriented information. Also see @subpage dev_doc for developer notes.

Visit the VPP wiki for details on more advanced building strategies and other development notes.

Test Framework

There is PyDoc generated documentation available for the VPP test framework. See @ref test_framework_doc for details.