droptail.py
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droptail.py
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	# Copyright 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 DropTail(QoSBase):
	# https://man7.org/linux/man-pages/man8/tc-pfifo.8.html
	def update(self, config, direction):
	tmp = f'tc qdisc add dev {self._interface} root pfifo'
	if 'queue_limit' in config:
	limit = config["queue_limit"]
	tmp += f' limit {limit}'
	self._cmd(tmp)

	# call base class
	super().update(config, direction)