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# Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
from re import search as re_search, MULTILINE as re_M
from vpp_papi import VPPApiClient
class VPPControl:
"""Control VPP network stack
"""
def __init__(self) -> None:
"""Create VPP API connection
"""
self.vpp_api_client = VPPApiClient()
self.vpp_api_client.connect('vpp-vyos')
def __del__(self) -> None:
"""Disconnect from VPP API (destructor)
"""
self.disconnect()
def disconnect(self) -> None:
"""Disconnect from VPP API
"""
self.vpp_api_client.disconnect()
def cli_cmd(self, command: str, return_output: bool = False) -> str:
"""Send raw CLI command
Args:
command (str): command to send
return_output (bool, optional): Return command output. Defaults to False.
Returns:
str: output of the command, only if it was successful
"""
cli_answer = self.vpp_api_client.api.cli_inband(cmd=command)
if return_output and cli_answer.retval == 0:
return cli_answer.reply
return ''
def get_mac(self, ifname: str) -> str:
"""Find MAC address by interface name in VPP
Args:
ifname (str): interface name inside VPP
Returns:
str: MAC address
"""
for iface in self.vpp_api_client.api.sw_interface_dump():
if iface.interface_name == ifname:
return iface.l2_address.mac_string
return ''
def get_sw_if_index(self, ifname: str) -> int | None:
"""Find interface index by interface name in VPP
Args:
ifname (str): interface name inside VPP
Returns:
int | None: Interface index or None (if was not fount)
"""
for iface in self.vpp_api_client.api.sw_interface_dump():
if iface.interface_name == ifname:
return iface.sw_if_index
return None
def lcp_pair_add(self, iface_name_vpp: str, iface_name_kernel: str) -> None:
"""Create LCP interface pair between VPP and kernel
Args:
iface_name_vpp (str): interface name in VPP
iface_name_kernel (str): interface name in kernel
"""
iface_index = self.get_sw_if_index(iface_name_vpp)
if iface_index:
self.vpp_api_client.api.lcp_itf_pair_add_del(
is_add=True,
sw_if_index=iface_index,
host_if_name=iface_name_kernel)
def lcp_pair_del(self, iface_name_vpp: str, iface_name_kernel: str) -> None:
"""Delete LCP interface pair between VPP and kernel
Args:
iface_name_vpp (str): interface name in VPP
iface_name_kernel (str): interface name in kernel
"""
iface_index = self.get_sw_if_index(iface_name_vpp)
if iface_index:
self.vpp_api_client.api.lcp_itf_pair_add_del(
is_add=False,
sw_if_index=iface_index,
host_if_name=iface_name_kernel)
def iface_rxmode(self, iface_name: str, rx_mode: str) -> None:
"""Set interface rx-mode in VPP
Args:
iface_name (str): interface name in VPP
rx_mode (str): mode (polling, interrupt, adaptive)
"""
modes_dict: dict[str, int] = {
'polling': 1,
'interrupt': 2,
'adaptive': 3
}
if rx_mode not in modes_dict:
return
iface_index = self.get_sw_if_index(iface_name)
self.vpp_api_client.api.sw_interface_set_rx_mode(
sw_if_index=iface_index, mode=modes_dict[rx_mode])
def get_pci_addr(self, ifname: str) -> str:
"""Find PCI address of interface by interface name in VPP
Args:
ifname (str): interface name inside VPP
Returns:
str: PCI address
"""
hw_info = self.cli_cmd(f'show hardware-interfaces {ifname}',
return_output=True)
regex_filter = r'^\s+pci: device (?P<device>\w+:\w+) subsystem (?P<subsystem>\w+:\w+) address (?P<address>\w+:\w+:\w+\.\w+) numa (?P<numa>\w+)$'
re_obj = re_search(regex_filter, hw_info, re_M)
# return empty string if no interface or no PCI info was found
if not hw_info or not re_obj:
return ''
address = re_obj.groupdict().get('address', '')
return address
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