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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.
"""Tap utilities library."""
from resources.libraries.python.VatExecutor import VatTerminal
from resources.libraries.python.InterfaceUtil import InterfaceUtil
from resources.libraries.python.topology import Topology
class Tap(object):
"""Tap utilities."""
@staticmethod
def add_tap_interface(node, tap_name, mac=None):
"""Add tap interface with name and optionally with MAC.
:param node: Node to add tap on.
:param tap_name: Tap interface name for linux tap.
:param mac: Optional MAC address for VPP tap.
:type node: dict
:type tap_name: str
:type mac: str
:returns: Returns a interface index.
:rtype: int
"""
command = 'connect'
if mac is not None:
args = 'tapname {} mac {}'.format(tap_name, mac)
else:
args = 'tapname {}'.format(tap_name)
with VatTerminal(node) as vat:
resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
tap_command=command,
tap_arguments=args)
sw_if_idx = resp[0]['sw_if_index']
if_key = Topology.add_new_port(node, 'tap')
Topology.update_interface_sw_if_index(node, if_key, sw_if_idx)
ifc_name = Tap.vpp_get_tap_interface_name(node, sw_if_idx)
Topology.update_interface_name(node, if_key, ifc_name)
if mac is None:
mac = Tap.vpp_get_tap_interface_mac(node, sw_if_idx)
Topology.update_interface_mac_address(node, if_key, mac)
Topology.update_interface_tap_dev_name(node, if_key, tap_name)
return sw_if_idx
@staticmethod
def modify_tap_interface(node, if_index, tap_name, mac=None):
"""Modify tap interface like linux interface name or VPP MAC.
:param node: Node to modify tap on.
:param if_index: Index of tap interface to be modified.
:param tap_name: Tap interface name for linux tap.
:param mac: Optional MAC address for VPP tap.
:type node: dict
:type if_index: int
:type tap_name: str
:type mac: str
:return: Returns a interface index.
:rtype: int
"""
command = 'modify'
if mac is not None:
args = 'sw_if_index {} tapname {} mac {}'.format(
if_index, tap_name, mac)
else:
args = 'sw_if_index {} tapname {}'.format(if_index, tap_name)
with VatTerminal(node) as vat:
resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
tap_command=command,
tap_arguments=args)
if_key = Topology.get_interface_by_sw_index(node, if_index)
Topology.update_interface_tap_dev_name(node, if_key, tap_name)
if mac:
Topology.update_interface_mac_address(node, if_key, mac)
return resp[0]['sw_if_index']
@staticmethod
def delete_tap_interface(node, if_index):
"""Delete tap interface.
:param node: Node to delete tap on.
:param if_index: Index of tap interface to be deleted.
:type node: dict
:type if_index: int
:raises RuntimeError: Deletion was not successful.
"""
command = 'delete'
args = 'sw_if_index {}'.format(if_index)
with VatTerminal(node) as vat:
resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
tap_command=command,
tap_arguments=args)
if int(resp[0]['retval']) != 0:
raise RuntimeError(
'Could not remove tap interface: {}'.format(resp))
if_key = Topology.get_interface_sw_index(node, if_index)
Topology.remove_port(node, if_key)
@staticmethod
def check_tap_present(node, tap_name):
"""Check whether specific tap interface exists.
:param node: Node to check tap on.
:param tap_name: Tap interface name for linux tap.
:type node: dict
:type tap_name: str
:raises RuntimeError: Specified interface was not found.
"""
tap_if = InterfaceUtil.tap_dump(node, tap_name)
if len(tap_if) == 0:
raise RuntimeError(
'Tap interface :{} does not exist'.format(tap_name))
@staticmethod
def vpp_get_tap_interface_name(node, sw_if_idx):
"""Get VPP tap interface name from hardware interfaces dump.
:param node: DUT node.
:param sw_if_idx: DUT node.
:type node: dict
:type sw_if_idx: int
:returns: VPP tap interface name.
:rtype: str
"""
with VatTerminal(node, json_param=False) as vat:
response = vat.vat_terminal_exec_cmd_from_template(
'show_hardware_detail.vat')
for line in str(response[0]).splitlines():
if line.startswith('tap-'):
line_split = line.split()
if line_split[1] == sw_if_idx:
return line_split[0]
return None
@staticmethod
def vpp_get_tap_interface_mac(node, sw_if_idx):
"""Get tap interface MAC address from hardware interfaces dump.
:param node: DUT node.
:param sw_if_idx: DUT node.
:type node: dict
:type sw_if_idx: int
:returns: Tap interface MAC address.
:rtype: str
"""
with VatTerminal(node, json_param=False) as vat:
response = vat.vat_terminal_exec_cmd_from_template(
'show_hardware_detail.vat')
tap_if_match = False
for line in str(response[0]).splitlines():
if tap_if_match:
line_split = line.split()
return line_split[-1]
if line.startswith('tap-'):
line_split = line.split()
if line_split[1] == sw_if_idx:
tap_if_match = True
return None
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