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| -rw-r--r-- | doc/developer/topotests.rst | 98 |
1 files changed, 74 insertions, 24 deletions
diff --git a/doc/developer/topotests.rst b/doc/developer/topotests.rst index b8f213b..9b9058b 100644 --- a/doc/developer/topotests.rst +++ b/doc/developer/topotests.rst @@ -8,14 +8,15 @@ Topotests is a suite of topology tests for FRR built on top of micronet. Installation and Setup ---------------------- -Topotests run under python3. Additionally, for ExaBGP (which is used -in some of the BGP tests) an older python2 version (and the python2 -version of ``pip``) must be installed. +Topotests run under python3. -Tested with Ubuntu 20.04,Ubuntu 18.04, and Debian 11. +Tested with Ubuntu 22.04,Ubuntu 20.04, and Debian 12. -Instructions are the same for all setups (i.e. ExaBGP is only used for -BGP tests). +Python protobuf version < 4 is required b/c python protobuf >= 4 requires a +protoc >= 3.19, and older package versions are shipped by in the above distros. + +Instructions are the same for all setups. However, ExaBGP is only used for +BGP tests. Tshark is only required if you enable any packet captures on test runs. @@ -35,15 +36,23 @@ Installing Topotest Requirements tshark \ valgrind python3 -m pip install wheel - python3 -m pip install 'pytest>=6.2.4' - python3 -m pip install 'pytest-xdist>=2.3.0' + python3 -m pip install 'pytest>=6.2.4' 'pytest-xdist>=2.3.0' python3 -m pip install 'scapy>=2.4.5' python3 -m pip install xmltodict - # Use python2 pip to install older ExaBGP - python2 -m pip install 'exabgp<4.0.0' + python3 -m pip install git+https://github.com/Exa-Networks/exabgp@0659057837cd6c6351579e9f0fa47e9fb7de7311 useradd -d /var/run/exabgp/ -s /bin/false exabgp - # To enable the gRPC topotest install: +The version of protobuf package that is installed on your system will determine +which versions of the python protobuf packages you need to install. + +.. code:: shell + # - Either - For protobuf version <= 3.12 + python3 -m pip install 'protobuf<4' + + # - OR- for protobuf version >= 3.21 + python3 -m pip install 'protobuf>=4' + + # To enable the gRPC topotest also install: python3 -m pip install grpcio grpcio-tools @@ -116,9 +125,9 @@ If you prefer to manually build FRR, then use the following suggested config: ./configure \ --prefix=/usr \ - --localstatedir=/var/run/frr \ + --sysconfdir=/etc \ + --localstatedir=/var \ --sbindir=/usr/lib/frr \ - --sysconfdir=/etc/frr \ --enable-vtysh \ --enable-pimd \ --enable-pim6d \ @@ -230,8 +239,8 @@ the number of the test we are interested in along with ``--errmsg`` option. ~/frr/tests/topotests# ./analyze.py -Ar run-save -T0 --errmsg bgp_multiview_topo1/test_bgp_multiview_topo1.py::test_bgp_converge: AssertionError: BGP did not converge: - IPv4 Unicast Summary (VIEW 1): - BGP router identifier 172.30.1.1, local AS number 100 vrf-id -1 + IPv4 Unicast Summary: + BGP router identifier 172.30.1.1, local AS number 100 VIEW 1 vrf-id -1 BGP table version 1 RIB entries 1, using 184 bytes of memory Peers 3, using 2169 KiB of memory @@ -266,8 +275,8 @@ select the first failed test case. > assert False, "BGP did not converge:\n%s" % bgpStatus E AssertionError: BGP did not converge: E - E IPv4 Unicast Summary (VIEW 1): - E BGP router identifier 172.30.1.1, local AS number 100 vrf-id -1 + E IPv4 Unicast Summary: + E BGP router identifier 172.30.1.1, local AS number 100 VIEW 1 vrf-id -1 [...] E Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd PfxSnt Desc E 172.16.1.1 4 65001 0 0 0 0 0 never Connect 0 N/A @@ -386,8 +395,9 @@ for ``master`` branch: ./bootstrap.sh ./configure \ --enable-address-sanitizer \ - --prefix=/usr/lib/frr --sysconfdir=/etc/frr \ - --localstatedir=/var/run/frr \ + --prefix=/usr/lib/frr \ + --sysconfdir=/etc \ + --localstatedir=/var \ --sbindir=/usr/lib/frr --bindir=/usr/lib/frr \ --with-moduledir=/usr/lib/frr/modules \ --enable-multipath=0 --enable-rtadv \ @@ -559,6 +569,8 @@ Here's an example of launching ``vtysh`` on routers ``rt1`` and ``rt2``. sudo -E pytest --vtysh=rt1,rt2 all-protocol-startup +.. _debug_with_gdb: + Debugging with GDB """""""""""""""""" @@ -583,6 +595,12 @@ Here's an example of launching ``zebra`` and ``bgpd`` inside ``gdb`` on router --gdb-breakpoints=nb_config_diff \ all-protocol-startup +Finally, for Emacs users, you can specify ``--gdb-use-emacs``. When specified +the first router and daemon to be launched in gdb will be launched and run with +Emacs gdb functionality by using `emacsclient --eval` commands. This provides an +IDE debugging experience for Emacs users. This functionality works best when +using password-less sudo. + Reporting Memleaks with FRR Memory Statistics """"""""""""""""""""""""""""""""""""""""""""" @@ -631,16 +649,26 @@ Detecting Memleaks with Valgrind """""""""""""""""""""""""""""""" Topotest can automatically launch all daemons with ``valgrind`` to check for -memleaks. This is enabled by specifying 1 or 2 CLI arguments. -``--valgrind-memleaks`` will enable general memleak detection, and -``--valgrind-extra`` enables extra functionality including generating a -suppression file. The suppression file ``tools/valgrind.supp`` is used when -memleak detection is enabled. +memleaks. This is enabled by specifying 1 to 3 CLI arguments. +``--valgrind-memleaks`` enables memleak detection. ``--valgrind-extra`` enables +extra functionality including generating a suppression file. The suppression +file ``tools/valgrind.supp`` is used when memleak detection is enabled. Finally, +``--valgrind-leak-kinds=KINDS`` can be used to modify what types of links are +reported. This corresponds to valgrind's ``--show-link-kinds`` arg. The value is +either ``all`` or a comma-separated list of types: +``definite,indirect,possible,reachable``. The default is ``definite,possible``. .. code:: shell sudo -E pytest --valgrind-memleaks all-protocol-startup +.. note:: GDB can be used in conjection with valgrind. + + When you enable ``--valgrind-memleaks`` and you also launch various daemons + under GDB (debug_with_gdb_) topotest will connect the two utilities using + ``--vgdb-error=0`` and attaching to a ``vgdb`` process. This is very + useful for debugging bugs with use of uninitialized errors, et al. + Collecting Performance Data using perf(1) """"""""""""""""""""""""""""""""""""""""" @@ -662,6 +690,28 @@ during the config_timing test. To specify different arguments for ``perf record``, one can use the ``--perf-options`` this will replace the ``-g`` used by default. +Running Daemons under RR Debug (``rr record``) +"""""""""""""""""""""""""""""""""""""""""""""" + +Topotest can automatically launch any daemon under ``rr(1)`` to collect +execution state. The daemon is run in the foreground with ``rr record``. + +The execution state will be saved in the router specific directory +(in a `rr` subdir that rr creates) under the test's run directoy. + +Here's an example of collecting ``rr`` execution state from ``mgmtd`` on router +``r1`` during the ``config_timing`` test. + +.. code:: console + + $ sudo -E pytest --rr-routers=r1 --rr-daemons=mgmtd config_timing + ... + $ find /tmp/topotests/ -name '*perf.data*' + /tmp/topotests/config_timing.test_config_timing/r1/perf.data + +To specify additional arguments for ``rr record``, one can use the +``--rr-options``. + .. _topotests_docker: Running Tests with Docker |