qos: T4284: first implementation introducing a new vyos.qos module

1 files changed, 40 insertions, 0 deletions

diff --git a/python/vyos/qos/priority.py b/python/vyos/qos/priority.py
new file mode 100644
index 000000000..72092b7ef
--- /dev/null
+++ b/python/vyos/qos/priority.py
@@ -0,0 +1,40 @@
+# 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
+from vyos.util import dict_search
+
+class Priority(QoSBase):
+    _parent = 1
+
+    # https://man7.org/linux/man-pages/man8/tc-prio.8.html
+    def update(self, config, direction):
+        if 'class' in config:
+            class_id_max = self._get_class_max_id(config)
+            bands = int(class_id_max) +1
+
+            tmp = f'tc qdisc add dev {self._interface} root handle {self._parent:x}: prio bands {bands} priomap ' \
+                  f'{class_id_max} {class_id_max} {class_id_max} {class_id_max} ' \
+                  f'{class_id_max} {class_id_max} {class_id_max} {class_id_max} ' \
+                  f'{class_id_max} {class_id_max} {class_id_max} {class_id_max} ' \
+                  f'{class_id_max} {class_id_max} {class_id_max} {class_id_max} '
+            self._cmd(tmp)
+
+            for cls in config['class']:
+                tmp = f'tc qdisc add dev {self._interface} parent {self._parent:x}:{cls:x} pfifo'
+                self._cmd(tmp)
+
+        # base class must be called last
+        super().update(config, direction, priority=True)