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# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""VPP Grub Utility Library."""
import re
from vpplib.VPPUtil import VPPUtil
__all__ = ['VppGrubUtil']
class VppGrubUtil(object):
""" VPP Grub Utilities."""
def _get_current_cmdline(self):
"""
Using /proc/cmdline return the current grub cmdline
:returns: The current grub cmdline
:rtype: string
"""
# Get the memory information using /proc/meminfo
cmd = 'sudo cat /proc/cmdline'
(ret, stdout, stderr) = VPPUtil.exec_command(cmd)
if ret != 0:
raise RuntimeError('{} on node {} {} {}'.
format(cmd, self._node['host'],
stdout, stderr))
self._current_cmdline = stdout.strip('\n')
def _get_default_cmdline(self):
"""
Using /etc/default/grub return the default grub cmdline
:returns: The default grub cmdline
:rtype: string
"""
# Get the default grub cmdline
rootdir = self._node['rootdir']
gfile = self._node['cpu']['grub_config_file']
grubcmdline = self._node['cpu']['grubcmdline']
cmd = 'cat {}'.format(rootdir + gfile)
(ret, stdout, stderr) = VPPUtil.exec_command(cmd)
if ret != 0:
raise RuntimeError('{} Executing failed on node {} {}'.
format(cmd, self._node['host'], stderr))
# Get the Default Linux command line, ignoring commented lines
lines = stdout.split('\n')
for line in lines:
if line == '' or line[0] == '#':
continue
ldefault = re.findall(r'{}=.+'.format(grubcmdline), line)
if ldefault:
self._default_cmdline = ldefault[0]
break
def get_current_cmdline(self):
"""
Returns the saved grub cmdline
:returns: The saved grub cmdline
:rtype: string
"""
return self._current_cmdline
def get_default_cmdline(self):
"""
Returns the default grub cmdline
:returns: The default grub cmdline
:rtype: string
"""
return self._default_cmdline
def create_cmdline(self, isolated_cpus):
"""
Create the new grub cmdline
:param isolated_cpus: The isolated cpu string
:type isolated_cpus: string
:returns: The command line
:rtype: string
"""
grubcmdline = self._node['cpu']['grubcmdline']
cmdline = self._default_cmdline
value = cmdline.split('{}='.format(grubcmdline))[1]
value = value.rstrip('"').lstrip('"')
# jadfix intel_pstate=disable sometimes cause networks to
# hang on reboot
# iommu = re.findall(r'iommu=\w+', value)
# pstate = re.findall(r'intel_pstate=\w+', value)
# If there is already some iommu commands set, leave them,
# if not use ours
# if iommu == [] and pstate == []:
# value = '{} intel_pstate=disable'.format(value)
# Replace isolcpus with ours
isolcpus = re.findall(r'isolcpus=[\w+\-,]+', value)
if not isolcpus:
if isolated_cpus != '':
value = "{} isolcpus={}".format(value, isolated_cpus)
else:
if isolated_cpus != '':
value = re.sub(r'isolcpus=[\w+\-,]+',
'isolcpus={}'.format(isolated_cpus),
value)
else:
value = re.sub(r'isolcpus=[\w+\-,]+', '', value)
nohz = re.findall(r'nohz_full=[\w+\-,]+', value)
if not nohz:
if isolated_cpus != '':
value = "{} nohz_full={}".format(value, isolated_cpus)
else:
if isolated_cpus != '':
value = re.sub(r'nohz_full=[\w+\-,]+',
'nohz_full={}'.format(isolated_cpus),
value)
else:
value = re.sub(r'nohz_full=[\w+\-,]+', '', value)
rcu = re.findall(r'rcu_nocbs=[\w+\-,]+', value)
if not rcu:
if isolated_cpus != '':
value = "{} rcu_nocbs={}".format(value, isolated_cpus)
else:
if isolated_cpus != '':
value = re.sub(r'rcu_nocbs=[\w+\-,]+',
'rcu_nocbs={}'.format(isolated_cpus),
value)
else:
value = re.sub(r'rcu_nocbs=[\w+\-,]+', '', value)
value = value.lstrip(' ').rstrip(' ')
cmdline = '{}="{}"'.format(grubcmdline, value)
return cmdline
def apply_cmdline(self, node, isolated_cpus):
"""
Apply cmdline to the default grub file
:param node: Node dictionary with cpuinfo.
:param isolated_cpus: The isolated cpu string
:type node: dict
:type isolated_cpus: string
:return The vpp cmdline
:rtype string
"""
vpp_cmdline = self.create_cmdline(isolated_cpus)
if vpp_cmdline == '':
return vpp_cmdline
# Update grub
# Save the original file
rootdir = node['rootdir']
grubcmdline = node['cpu']['grubcmdline']
ofilename = rootdir + node['cpu']['grub_config_file'] + '.orig'
filename = rootdir + node['cpu']['grub_config_file']
# Write the output file
# Does a copy of the original file exist, if not create one
(ret, stdout, stderr) = VPPUtil.exec_command('ls {}'.format(ofilename))
if ret != 0:
if stdout.strip('\n') != ofilename:
cmd = 'sudo cp {} {}'.format(filename, ofilename)
(ret, stdout, stderr) = VPPUtil.exec_command(cmd)
if ret != 0:
raise RuntimeError('{} failed on node {} {}'.
format(cmd, self._node['host'], stderr))
# Get the contents of the current grub config file
cmd = 'cat {}'.format(filename)
(ret, stdout, stderr) = VPPUtil.exec_command(cmd)
if ret != 0:
raise RuntimeError('{} failed on node {} {}'.format(
cmd,
self._node['host'],
stderr))
# Write the new contents
# Get the Default Linux command line, ignoring commented lines
content = ""
lines = stdout.split('\n')
for line in lines:
if line == '':
content += line + '\n'
continue
if line[0] == '#':
content += line + '\n'
continue
ldefault = re.findall(r'{}=.+'.format(grubcmdline), line)
if ldefault:
content += vpp_cmdline + '\n'
else:
content += line + '\n'
content = content.replace(r"`", r"\`")
content = content.rstrip('\n')
cmd = "sudo cat > {0} << EOF\n{1}\n".format(filename, content)
(ret, stdout, stderr) = VPPUtil.exec_command(cmd)
if ret != 0:
raise RuntimeError('{} failed on node {} {}'.format(
cmd,
self._node['host'],
stderr))
return vpp_cmdline
def __init__(self, node):
distro = VPPUtil.get_linux_distro()
if distro[0] == 'Ubuntu':
node['cpu']['grubcmdline'] = 'GRUB_CMDLINE_LINUX_DEFAULT'
else:
node['cpu']['grubcmdline'] = 'GRUB_CMDLINE_LINUX'
self._node = node
self._current_cmdline = ""
self._default_cmdline = ""
self._get_current_cmdline()
self._get_default_cmdline()
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