A Python agent for provisioning and deprovisioning Bare Metal servers.
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ironic-python-agent/ironic_python_agent/hardware_managers/cna.py

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# Copyright (C) 2016 Intel Corporation
#
# 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.
import os
from oslo_concurrency import processutils
from oslo_config import cfg
from oslo_log import log
from ironic_python_agent import hardware
from ironic_python_agent import utils
LOG = log.getLogger()
CONF = cfg.CONF
def _detect_cna_card():
addr_path = '/sys/class/net'
for net_dev in os.listdir(addr_path):
link_path = '{}/{}/device/driver/module'.format(addr_path, net_dev)
try:
out = utils.execute('readlink', '-v', link_path)
except OSError as e:
LOG.warning('Something went wrong when readlink for '
'interface %(device)s. Error: %(error)s',
{'device': net_dev, 'error': e})
continue
except processutils.ProcessExecutionError as e:
LOG.debug('Get driver for interface %(device)s failed. '
'Error: %(error)s',
{'device': net_dev, 'error': e})
continue
driver_name = os.path.basename(out[0].strip())
if driver_name == 'i40e':
return True
return False
def _disable_embedded_lldp_agent_in_cna_card():
addr_path = '/sys/kernel/debug/i40e'
failed_dirs = []
if os.path.exists(addr_path):
addr_dirs = os.listdir(addr_path)
else:
LOG.warning('Driver i40e was not loaded properly')
return
for inner_dir in addr_dirs:
try:
command_path = '{}/{}/command'.format(addr_path, inner_dir)
with open(command_path, 'w') as command_file:
command_file.write('lldp stop')
except (OSError, IOError):
failed_dirs.append(inner_dir)
continue
if failed_dirs:
LOG.warning('Failed to disable the embedded LLDP on Intel CNA network '
'card. Addresses of failed pci devices: {}'
.format(str(failed_dirs).strip('[]')))
class IntelCnaHardwareManager(hardware.HardwareManager):
HARDWARE_MANAGER_NAME = 'IntelCnaHardwareManager'
HARDWARE_MANAGER_VERSION = '1.0'
def evaluate_hardware_support(self):
if _detect_cna_card():
LOG.debug('Found Intel CNA network card')
# On Intel CNA cards, in order to make LLDP info collecting
# possible, the embedded LLDP agent, which runs inside that
# card, needs to be turned off.
if CONF.collect_lldp:
LOG.info('Disable CNA network card embedded lldp agent now')
_disable_embedded_lldp_agent_in_cna_card()
return hardware.HardwareSupport.MAINLINE
else:
LOG.debug('No Intel CNA network card found')
return hardware.HardwareSupport.NONE