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# Copyright 2022 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 math import ceil
from vyos.qos.base import QoSBase
# Kernel limits on quantum (bytes)
MAXQUANTUM = 200000
MINQUANTUM = 1000
class TrafficShaper(QoSBase):
_parent = 1
# https://man7.org/linux/man-pages/man8/tc-htb.8.html
def update(self, config, direction):
class_id_max = 0
if 'class' in config:
tmp = list(config['class'])
tmp.sort()
class_id_max = tmp[-1]
r2q = 10
# bandwidth is a mandatory CLI node
speed = self._rate_convert(config['bandwidth'])
speed_bps = int(speed) // 8
# need a bigger r2q if going fast than 16 mbits/sec
if (speed_bps // r2q) >= MAXQUANTUM: # integer division
r2q = ceil(speed_bps // MAXQUANTUM)
else:
# if there is a slow class then may need smaller value
if 'class' in config:
min_speed = speed_bps
for cls, cls_options in config['class'].items():
# find class with the lowest bandwidth used
if 'bandwidth' in cls_options:
bw_bps = int(self._rate_convert(cls_options['bandwidth'])) // 8 # bandwidth in bytes per second
if bw_bps < min_speed:
min_speed = bw_bps
while (r2q > 1) and (min_speed // r2q) < MINQUANTUM:
tmp = r2q -1
if (speed_bps // tmp) >= MAXQUANTUM:
break
r2q = tmp
default_minor_id = int(class_id_max) +1
tmp = f'tc qdisc replace dev {self._interface} root handle {self._parent:x}: htb r2q {r2q} default {default_minor_id:x}' # default is in hex
self._cmd(tmp)
tmp = f'tc class replace dev {self._interface} parent {self._parent:x}: classid {self._parent:x}:1 htb rate {speed}'
self._cmd(tmp)
if 'class' in config:
for cls, cls_config in config['class'].items():
# class id is used later on and passed as hex, thus this needs to be an int
cls = int(cls)
# bandwidth is a mandatory CLI node
rate = self._rate_convert(cls_config['bandwidth'])
burst = cls_config['burst']
quantum = cls_config['codel_quantum']
tmp = f'tc class replace dev {self._interface} parent {self._parent:x}:1 classid {self._parent:x}:{cls:x} htb rate {rate} burst {burst} quantum {quantum}'
if 'priority' in cls_config:
priority = cls_config['priority']
tmp += f' prio {priority}'
self._cmd(tmp)
tmp = f'tc qdisc replace dev {self._interface} parent {self._parent:x}:{cls:x} sfq'
self._cmd(tmp)
if 'default' in config:
rate = self._rate_convert(config['default']['bandwidth'])
burst = config['default']['burst']
quantum = config['default']['codel_quantum']
tmp = f'tc class replace dev {self._interface} parent {self._parent:x}:1 classid {self._parent:x}:{default_minor_id:x} htb rate {rate} burst {burst} quantum {quantum}'
if 'priority' in config['default']:
priority = config['default']['priority']
tmp += f' prio {priority}'
self._cmd(tmp)
tmp = f'tc qdisc replace dev {self._interface} parent {self._parent:x}:{default_minor_id:x} sfq'
self._cmd(tmp)
# call base class
super().update(config, direction)
class TrafficShaperHFSC(TrafficShaper):
def update(self, config, direction):
# call base class
super().update(config, direction)
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