docs: better docs, mv doxygen to sphinx

This patch refactors the VPP sphinx docs
in order to make it easier to consume
for external readers as well as VPP developers.

It also makes sphinx the single source
of documentation, which simplifies maintenance
and operation.

Most important updates are:

- reformat the existing documentation as rst
- split RELEASE.md and move it into separate rst files
- remove section 'events'
- remove section 'archive'
- remove section 'related projects'
- remove section 'feature by release'
- remove section 'Various links'
- make (Configuration reference, CLI docs,
  developer docs) top level items in the list
- move 'Use Cases' as part of 'About VPP'
- move 'Troubleshooting' as part of 'Getting Started'
- move test framework docs into 'Developer Documentation'
- add a 'Contributing' section for gerrit,
  docs and other contributer related infos
- deprecate doxygen and test-docs targets
- redirect the "make doxygen" target to "make docs"

Type: refactor

Change-Id: I552a5645d5b7964d547f99b1336e2ac24e7c209f
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

2 files changed, 289 insertions, 0 deletions

diff --git a/docs/contributing/reportingissues/index.rst b/docs/contributing/reportingissues/index.rst
new file mode 100644
index 00000000000..b16a2a915a8
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+.. _reportingissues:
+
+Reporting Bugs
+==============
+
+Although every situation is different, this section describes how to
+collect data which will help make efficient use of everyone's time
+when dealing with vpp bugs.
+
+Before you press the Jira button to create a bug report - or email
+vpp-dev@lists.fd.io - please ask yourself whether there's enough
+information for someone else to understand and to reproduce the issue
+given a reasonable amount of effort. **Unicast emails to maintainers,
+committers, and the project PTL are strongly discouraged.**
+
+A good strategy for clear-cut bugs: file a detailed Jira ticket, and
+then send a short description of the issue to vpp-dev@lists.fd.io,
+perhaps from the Jira ticket description. It's fine to send email to
+vpp-dev@lists.fd.io to ask a few questions **before** filing Jira tickets.
+
+.. toctree::
+
+  reportingissues
diff --git a/docs/contributing/reportingissues/reportingissues.rst b/docs/contributing/reportingissues/reportingissues.rst
new file mode 100644
index 00000000000..970f3407c54
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+++ b/docs/contributing/reportingissues/reportingissues.rst
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+.. _reportingbugs:
+
+.. toctree::
+
+Data to include in bug reports
+==============================
+
+Image version and operating environment
+---------------------------------------
+
+Please make sure to include the vpp image version and command-line arguments.
+
+.. code-block:: console
+
+    $ sudo bash
+    # vppctl show version verbose cmdline
+    Version:                  v18.07-rc0~509-gb9124828
+    Compiled by:              vppuser
+    Compile host:             vppbuild
+    Compile date:             Fri Jul 13 09:05:37 EDT 2018
+    Compile location:         /scratch/vpp-showversion
+    Compiler:                 GCC 7.3.0
+    Current PID:              5211
+    Command line arguments:
+      /scratch/vpp-showversion/build-root/install-vpp_debug-native/vpp/bin/vpp
+      unix
+      interactive
+
+With respect to the operating environment: if misbehavior involving a
+specific VM / container / bare-metal environment is involved, please
+describe the environment in detail:
+
+* Linux Distro (e.g. Ubuntu 18.04.2 LTS, CentOS-7, etc.)
+* NIC type(s) (ixgbe, i40e, enic, etc. etc.), vhost-user, tuntap
+* NUMA configuration if applicable
+
+Please note the CPU architecture (x86_86, aarch64), and hardware platform.
+
+When practicable, please report issues against released software, or
+unmodified master/latest software.
+
+"Show" command output
+---------------------
+
+Every situation is different. If the issue involves a sequence of
+debug CLI command, please enable CLI command logging, and send the
+sequence involved. Note that the debug CLI is a developer's tool -
+**no warranty express or implied** - and that we may choose not to fix
+debug CLI bugs.
+
+Please include "show error" [error counter] output. It's often helpful
+to "clear error", send a bit of traffic, then "show error"
+particularly when running vpp on noisy networks.
+
+Please include ip4 / ip6 / mpls FIB contents ("show ip fib", "show ip6
+fib", "show mpls fib", "show mpls tunnel").
+
+Please include "show hardware", "show interface", and "show interface
+address" output
+
+Here is a consolidated set of commands that are generally useful
+before/after sending traffic.  Before sending traffic:
+
+.. code-block:: console
+
+    vppctl clear hardware
+    vppctl clear interface
+    vppctl clear error
+    vppctl clear run
+
+Send some traffic and then issue the following commands.
+
+.. code-block:: console
+
+    vppctl show version verbose
+    vppctl show hardware
+    vppctl show interface address
+    vppctl show interface
+    vppctl show run
+    vppctl show error
+
+Here are some protocol specific show commands that may also make
+sense.  Only include those features which have been configured.
+
+.. code-block:: console
+
+     vppctl show l2fib
+     vppctl show bridge-domain
+
+     vppctl show ip fib
+     vppctl show ip neighbors
+
+     vppctl show ip6 fib
+     vppctl show ip6 neighbors
+
+     vppctl show mpls fib
+     vppctl show mpls tunnel
+
+Network Topology
+----------------
+
+Please include a crisp description of the network topology, including
+L2 / IP / MPLS / segment-routing addressing details. If you expect
+folks to reproduce and debug issues, this is a must.
+
+At or above a certain level of topological complexity, it becomes
+problematic to reproduce the original setup.
+
+Packet Tracer Output
+--------------------
+
+If you capture packet tracer output which seems relevant, please include it.
+
+.. code-block:: console
+
+    vppctl trace add dpdk-input 100  # or similar
+
+send-traffic
+
+.. code-block:: console
+
+    vppctl show trace
+
+Capturing post-mortem data
+==========================
+
+It should go without saying, but anyhow: **please put post-mortem data
+in obvious, accessible places.** Time wasted trying to acquire
+accounts, credentials, and IP addresses simply delays problem
+resolution.
+
+Please remember to add post-mortem data location information to Jira
+tickets.
+
+Syslog Output
+-------------
+
+The vpp signal handler typically writes a certain amount of data in
+/var/log/syslog before exiting. Make sure to check for evidence, e.g
+via "grep /usr/bin/vpp /var/log/syslog" or similar.
+
+Binary API Trace
+----------------
+
+If the issue involves a sequence of control-plane API messages - even
+a very long sequence - please enable control-plane API
+tracing. Control-plane API post-mortem traces end up in
+/tmp/api_post_mortem.<pid>.
+
+Please remember to put post-mortem binary api traces in accessible
+places.
+
+These API traces are especially helpful in cases where the vpp engine
+is throwing traffic on the floor, e.g. for want of a default route or
+similar.
+
+Make sure to leave the default stanza "... api-trace { on } ... " in
+the vpp startup configuration file /etc/vpp/startup.conf, or to
+include it in the command line arguments passed by orchestration
+software.
+
+Core Files
+----------
+
+Production systems, as well as long-running pre-production soak-test
+systems, **must** arrange to collect core images. There are various
+ways to configure core image capture, including e.g. the Ubuntu
+"corekeeper" package. In a pinch, the following very basic sequence
+will capture usable vpp core files in /tmp/dumps.
+
+.. code-block:: console
+
+    # mkdir -p /tmp/dumps
+    # sysctl -w debug.exception-trace=1
+    # sysctl -w kernel.core_pattern="/tmp/dumps/%e-%t"
+    # ulimit -c unlimited
+    # echo 2 > /proc/sys/fs/suid_dumpable
+
+If you start VPP from systemd, you also need to edit
+/lib/systemd/system/vpp.service and uncomment the "LimitCORE=infinity"
+line before restarting VPP.
+
+Vpp core files often appear enormous, but they are invariably
+sparse. Gzip compresses them to manageable sizes. A multi-GByte
+corefile often compresses to 10-20 Mbytes.
+
+When decompressing a vpp core file, we suggest using "dd" as shown to
+create a sparse, uncompressed core file:
+
+.. code-block:: console
+
+   $ zcat vpp_core.gz | dd conv=sparse of=vpp_core
+
+Please remember to put compressed core files in accessible places.
+
+Make sure to leave the default stanza "... unix { ... full-coredump
+... } ... " in the vpp startup configuration file
+/etc/vpp/startup.conf, or to include it in the command line arguments
+passed by orchestration software.
+
+Core files from Private Images
+==============================
+
+Core files from private images require special handling. If it's
+necessary to go that route, copy the **exact** Debian packages (or
+RPMs) which correspond to the core file to the same public place as
+the core file. A no-excuses-allowed, hard-and-fast requirement.
+
+In particular:
+
+.. code-block:: console
+
+  libvppinfra_<version>_<arch>.deb # vppinfra library
+  libvppinfra-dev_<version>_<arch>.deb # vppinfra library development pkg
+  vpp_<version>_<arch>.deb         # the vpp executable
+  vpp-dbg_<version>_<arch>.deb     # debug symbols
+  vpp-dev_<version>_<arch>.deb     # vpp development pkg
+  vpp-lib_<version>_<arch>.deb     # shared libraries
+  vpp-plugin-core_<version>_<arch>.deb # core plugins
+  vpp-plugin-dpdk_<version>_<arch>.deb # dpdk plugin
+
+For reference, please include git commit-ID, branch, and git repo
+information [for repos other than gerrit.fd.io] in the Jira ticket.
+
+Note that git commit-ids are crypto sums of the head [latest]
+**merged** patch. They say **nothing whatsoever** about local
+workspace modifications, branching, or the git repo in question.
+
+Even given a byte-for-byte identical source tree, it's easy to build
+dramatically different binary artifacts. All it takes is a different
+toolchain version.
+
+
+On-the-fly Core File Compression
+--------------------------------
+
+Depending on operational requirements, it's possible to compress
+corefiles as they are generated. Please note that it takes several
+seconds' worth of wall-clock time to compress a vpp core file on the
+fly, during which all packet processing activities are suspended.
+
+To create compressed core files on the fly, create the following
+script, e.g. in /usr/local/bin/compressed_corefiles, owned by root,
+executable:
+
+.. code-block:: console
+
+  #!/bin/sh
+  exec /bin/gzip -f - >"/tmp/dumps/core-$1.$2.gz"
+
+Adjust the kernel core file pattern as shown:
+
+.. code-block:: console
+
+  sysctl -w kernel.core_pattern="|/usr/local/bin/compressed_corefiles %e %t"
+
+Core File Summary
+-----------------
+
+Bottom line: please follow core file handling instructions to the
+letter. It's not complicated. Simply copy the exact Debian packages or
+RPMs which correspond to core files to accessible locations.
+
+If we go through the setup process only to discover that the image and
+core files don't match, it will simply delay resolution of the issue;
+to say nothing of irritating the person who just wasted their time.