1 # Copyright (c) 2019 Cisco and/or its affiliates.
2 # Licensed under the Apache License, Version 2.0 (the "License");
3 # you may not use this file except in compliance with the License.
4 # You may obtain a copy of the License at:
6 # http://www.apache.org/licenses/LICENSE-2.0
8 # Unless required by applicable law or agreed to in writing, software
9 # distributed under the License is distributed on an "AS IS" BASIS,
10 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 # See the License for the specific language governing permissions and
12 # limitations under the License.
14 """Tap utilities library."""
16 from ipaddress import ip_address
17 from robot.api import logger
19 from resources.libraries.python.Constants import Constants
20 from resources.libraries.python.InterfaceUtil import InterfaceUtil
21 from resources.libraries.python.L2Util import L2Util
22 from resources.libraries.python.PapiExecutor import PapiSocketExecutor
23 from resources.libraries.python.topology import Topology
30 def add_tap_interface(node, tap_name, mac=None):
31 """Add tap interface with name and optionally with MAC.
33 :param node: Node to add tap on.
34 :param tap_name: Tap interface name for linux tap.
35 :param mac: Optional MAC address for VPP tap.
39 :returns: Returns a interface index.
42 cmd = u"tap_create_v2"
44 id=Constants.BITWISE_NON_ZERO,
45 use_random_mac=0 if mac else 1,
46 mac_address=L2Util.mac_to_bin(mac) if mac else 6 * b"\0",
47 host_namespace=64 * b"\0",
48 host_mac_addr=6 * b"\0",
50 host_if_name=tap_name.encode(encoding=u"utf-8") +
51 (64 - len(tap_name)) * b"\0",
52 host_bridge=64 * b"\0",
53 host_ip4_addr=4 * b"\0",
54 host_ip6_addr=16 * b"\0",
55 host_ip4_gw=4 * b"\0",
56 host_ip6_gw=16 * b"\0"
58 err_msg = f"Failed to create tap interface {tap_name} " \
59 f"on host {node[u'host']}"
61 with PapiSocketExecutor(node) as papi_exec:
62 sw_if_index = papi_exec.add(cmd, **args).get_sw_if_index(err_msg)
64 if_key = Topology.add_new_port(node, u"tap")
65 Topology.update_interface_sw_if_index(node, if_key, sw_if_index)
66 Topology.update_interface_name(node, if_key, tap_name)
68 mac = Tap.vpp_get_tap_interface_mac(node, tap_name)
69 Topology.update_interface_mac_address(node, if_key, mac)
70 tap_dev_name = Tap.vpp_get_tap_dev_name(node, tap_name)
71 Topology.update_interface_tap_dev_name(node, if_key, tap_dev_name)
76 def vpp_get_tap_dev_name(node, host_if_name):
77 """Get VPP tap interface name from hardware interfaces dump.
79 :param node: DUT node.
80 :param host_if_name: Tap host interface name.
82 :type host_if_name: str
83 :returns: VPP tap interface dev_name.
86 return Tap.tap_dump(node, host_if_name).get(u"dev_name")
89 def vpp_get_tap_interface_mac(node, interface_name):
90 """Get tap interface MAC address from interfaces dump.
92 :param node: DUT node.
93 :param interface_name: Tap interface name.
95 :type interface_name: str
96 :returns: Tap interface MAC address.
99 return InterfaceUtil.vpp_get_interface_mac(node, interface_name)
102 def tap_dump(node, name=None):
103 """Get all TAP interface data from the given node, or data about
104 a specific TAP interface.
106 :param node: VPP node to get data from.
107 :param name: Optional name of a specific TAP interface.
110 :returns: Dictionary of information about a specific TAP interface, or
111 a List of dictionaries containing all TAP data for the given node.
114 def process_tap_dump(tap_dump):
117 :param tap_dump: Tap interface dump.
119 :returns: Processed tap interface dump.
122 tap_dump[u"host_mac_addr"] = L2Util.bin_to_mac(
123 tap_dump[u"host_mac_addr"]
125 tap_dump[u"host_ip4_addr"] = ip_address(tap_dump[u"host_ip4_addr"])
126 tap_dump[u"host_ip6_addr"] = ip_address(tap_dump[u"host_ip6_addr"])
130 cmd = u"sw_interface_tap_v2_dump"
131 err_msg = f"Failed to get TAP dump on host {node[u'host']}"
133 with PapiSocketExecutor(node) as papi_exec:
134 details = papi_exec.add(cmd).get_details(err_msg)
136 data = list() if name is None else dict()
139 data.append(process_tap_dump(dump))
140 elif dump.get(u"host_if_name") == name:
141 data = process_tap_dump(dump)
144 logger.debug(f"TAP data:\n{data}")