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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 vyos.qos.base import QoSBase
class FairQueue(QoSBase):
# https://man7.org/linux/man-pages/man8/tc-sfq.8.html
def update(self, config, direction):
tmp = f'tc qdisc add dev {self._interface} root sfq'
if 'hash_interval' in config:
tmp += f' perturb {config["hash_interval"]}'
if 'queue_limit' in config:
tmp += f' limit {config["queue_limit"]}'
self._cmd(tmp)
# call base class
super().update(config, direction)
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