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Date: Wed, 14 Feb 2018 17:45:17 -0500
From: Lucas Bates <lucasb@...atatu.com>
To: "Brenda J. Butler" <bjb@...atatu.com>
Cc: davem@...emloft.net, kernel@...atatu.com,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>, Chris Mi <chrism@...lanox.com>,
Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 5/7] tools: tc-testing: nsPlugin
On Wed, Feb 14, 2018 at 2:09 PM, Brenda J. Butler <bjb@...atatu.com> wrote:
> Move the functionality of creating a namespace before the test suite
> and destroying it afterwards to a plugin.
>
> Signed-off-by: Brenda J. Butler <bjb@...atatu.com>
Acked-by: Lucas Bates <lucasb@...atatu.com>
> ---
> .../selftests/tc-testing/plugin-lib/nsPlugin.py | 141 +++++++++++++++++++++
> tools/testing/selftests/tc-testing/tdc.py | 45 +------
> 2 files changed, 142 insertions(+), 44 deletions(-)
> create mode 100644 tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
>
> diff --git a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
> new file mode 100644
> index 000000000000..a194b1af2b30
> --- /dev/null
> +++ b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
> @@ -0,0 +1,141 @@
> +import os
> +import signal
> +from string import Template
> +import subprocess
> +import time
> +from TdcPlugin import TdcPlugin
> +
> +from tdc_config import *
> +
> +class SubPlugin(TdcPlugin):
> + def __init__(self):
> + self.sub_class = 'ns/SubPlugin'
> + super().__init__()
> +
> + def pre_suite(self, testcount, testidlist):
> + '''run commands before test_runner goes into a test loop'''
> + super().pre_suite(testcount, testidlist)
> +
> + if self.args.namespace:
> + self._ns_create()
> +
> + def post_suite(self, index):
> + '''run commands after test_runner goes into a test loop'''
> + super().post_suite(index)
> + if self.args.verbose:
> + print('{}.post_suite'.format(self.sub_class))
> +
> + if self.args.namespace:
> + self._ns_destroy()
> +
> + def add_args(self, parser):
> + super().add_args(parser)
> + self.argparser_group = self.argparser.add_argument_group(
> + 'netns',
> + 'options for nsPlugin(run commands in net namespace)')
> + self.argparser_group.add_argument(
> + '-n', '--namespace', action='store_true',
> + help='Run commands in namespace')
> + return self.argparser
> +
> + def adjust_command(self, stage, command):
> + super().adjust_command(stage, command)
> + cmdform = 'list'
> + cmdlist = list()
> +
> + if not self.args.namespace:
> + return command
> +
> + if self.args.verbose:
> + print('{}.adjust_command'.format(self.sub_class))
> +
> + if not isinstance(command, list):
> + cmdform = 'str'
> + cmdlist = command.split()
> + else:
> + cmdlist = command
> + if stage == 'setup' or stage == 'execute' or stage == 'verify' or stage == 'teardown':
> + if self.args.verbose:
> + print('adjust_command: stage is {}; inserting netns stuff in command [{}] list [{}]'.format(stage, command, cmdlist))
> + cmdlist.insert(0, self.args.NAMES['NS'])
> + cmdlist.insert(0, 'exec')
> + cmdlist.insert(0, 'netns')
> + cmdlist.insert(0, 'ip')
> + else:
> + pass
> +
> + if cmdform == 'str':
> + command = ' '.join(cmdlist)
> + else:
> + command = cmdlist
> +
> + if self.args.verbose:
> + print('adjust_command: return command [{}]'.format(command))
> + return command
> +
> + def _ns_create(self):
> + '''
> + Create the network namespace in which the tests will be run and set up
> + the required network devices for it.
> + '''
> + if self.args.namespace:
> + cmd = 'ip netns add {}'.format(self.args.NAMES['NS'])
> + self._exec_cmd('pre', cmd)
> + cmd = 'ip link add $DEV0 type veth peer name $DEV1'
> + self._exec_cmd('pre', cmd)
> + cmd = 'ip link set $DEV1 netns {}'.format(self.args.NAMES['NS'])
> + self._exec_cmd('pre', cmd)
> + cmd = 'ip link set $DEV0 up'
> + self._exec_cmd('pre', cmd)
> + cmd = 'ip -n {} link set $DEV1 up'.format(self.args.NAMES['NS'])
> + self._exec_cmd('pre', cmd)
> + if self.args.device:
> + cmd = 'ip link set $DEV2 netns {}'.format(self.args.NAMES['NS'])
> + self._exec_cmd('pre', cmd)
> + cmd = 'ip -n {} link set $DEV2 up'.format(self.args.NAMES['NS'])
> + self._exec_cmd('pre', cmd)
> +
> + def _ns_destroy(self):
> + '''
> + Destroy the network namespace for testing (and any associated network
> + devices as well)
> + '''
> + if self.args.namespace:
> + cmd = 'ip netns delete {}'.format(self.args.NAMES['NS'])
> + self._exec_cmd('post', cmd)
> +
> + def _exec_cmd(self, stage, command):
> + '''
> + Perform any required modifications on an executable command, then run
> + it in a subprocess and return the results.
> + '''
> + if '$' in command:
> + command = self._replace_keywords(command)
> +
> + self.adjust_command(stage, command)
> + if self.args.verbose:
> + print('_exec_cmd: command "{}"'.format(command))
> + proc = subprocess.Popen(command,
> + shell=True,
> + stdout=subprocess.PIPE,
> + stderr=subprocess.PIPE,
> + env=ENVIR)
> + (rawout, serr) = proc.communicate()
> +
> + if proc.returncode != 0 and len(serr) > 0:
> + foutput = serr.decode("utf-8")
> + else:
> + foutput = rawout.decode("utf-8")
> +
> + proc.stdout.close()
> + proc.stderr.close()
> + return proc, foutput
> +
> + def _replace_keywords(self, cmd):
> + """
> + For a given executable command, substitute any known
> + variables contained within NAMES with the correct values
> + """
> + tcmd = Template(cmd)
> + subcmd = tcmd.safe_substitute(self.args.NAMES)
> + return subcmd
> diff --git a/tools/testing/selftests/tc-testing/tdc.py b/tools/testing/selftests/tc-testing/tdc.py
> index a718d2b57739..b3754b9aa302 100755
> --- a/tools/testing/selftests/tc-testing/tdc.py
> +++ b/tools/testing/selftests/tc-testing/tdc.py
> @@ -23,8 +23,6 @@ from tdc_helper import *
>
> import TdcPlugin
>
> -USE_NS = True
> -
> class PluginMgr:
> def __init__(self, argparser):
> super().__init__()
> @@ -107,16 +105,13 @@ def replace_keywords(cmd):
> return subcmd
>
>
> -def exec_cmd(args, pm, stage, command, nsonly=True):
> +def exec_cmd(args, pm, stage, command):
> """
> Perform any required modifications on an executable command, then run
> it in a subprocess and return the results.
> """
> if len(command.strip()) == 0:
> return None, None
> - if (USE_NS and nsonly):
> - command = 'ip netns exec $NS ' + command
> -
> if '$' in command:
> command = replace_keywords(command)
>
> @@ -265,39 +260,6 @@ def test_runner(pm, args, filtered_tests):
>
> return tap
>
> -
> -def ns_create(args, pm):
> - """
> - Create the network namespace in which the tests will be run and set up
> - the required network devices for it.
> - """
> - if (USE_NS):
> - cmd = 'ip netns add $NS'
> - exec_cmd(args, pm, 'pre', cmd, False)
> - cmd = 'ip link add $DEV0 type veth peer name $DEV1'
> - exec_cmd(args, pm, 'pre', cmd, False)
> - cmd = 'ip link set $DEV1 netns $NS'
> - exec_cmd(args, pm, 'pre', cmd, False)
> - cmd = 'ip link set $DEV0 up'
> - exec_cmd(args, pm, 'pre', cmd, False)
> - cmd = 'ip -n $NS link set $DEV1 up'
> - exec_cmd(args, pm, 'pre', cmd, False)
> - cmd = 'ip link set $DEV2 netns $NS'
> - exec_cmd(args, pm, 'pre', cmd, False)
> - cmd = 'ip -n $NS link set $DEV2 up'
> - exec_cmd(args, pm, 'pre', cmd, False)
> -
> -
> -def ns_destroy(args, pm):
> - """
> - Destroy the network namespace for testing (and any associated network
> - devices as well)
> - """
> - if (USE_NS):
> - cmd = 'ip netns delete $NS'
> - exec_cmd(args, pm, 'post', cmd, False)
> -
> -
> def has_blank_ids(idlist):
> """
> Search the list for empty ID fields and return true/false accordingly.
> @@ -579,17 +541,12 @@ def set_operation_mode(pm, args):
> list_test_cases(alltests)
> exit(0)
>
> - ns_create(args, pm)
> -
> if len(alltests):
> catresults = test_runner(pm, args, alltests)
> else:
> catresults = 'No tests found\n'
> print('All test results: \n\n{}'.format(catresults))
>
> - ns_destroy(args, pm)
> -
> -
> def main():
> """
> Start of execution; set up argument parser and get the arguments,
> --
> 2.15.1
>
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