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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 len(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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