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

1 files changed, 44 insertions, 0 deletions

diff --git a/python/vyos/qos/roundrobin.py b/python/vyos/qos/roundrobin.py
new file mode 100644
index 000000000..4a0cb18aa
--- /dev/null
+++ b/python/vyos/qos/roundrobin.py
@@ -0,0 +1,44 @@
+# 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 RoundRobin(QoSBase):
+    _parent = 1
+
+    # https://man7.org/linux/man-pages/man8/tc-drr.8.html
+    def update(self, config, direction):
+        tmp = f'tc qdisc add dev {self._interface} root handle 1: drr'
+        self._cmd(tmp)
+
+        if 'class' in config:
+            for cls in config['class']:
+                cls = int(cls)
+                tmp = f'tc class add dev {self._interface} parent 1:1 classid 1:{cls:x} drr'
+                self._cmd(tmp)
+
+                tmp = f'tc qdisc add dev {self._interface} parent 1:{cls:x} pfifo'
+                self._cmd(tmp)
+
+        if 'default' in config:
+            class_id_max = self._get_class_max_id(config)
+            default_cls_id = int(class_id_max) +1
+
+            # class ID via CLI is in range 1-4095, thus 1000 hex = 4096
+            tmp = f'tc class add dev {self._interface} parent 1:1 classid 1:{default_cls_id:x} drr'
+            self._cmd(tmp)
+
+        # call base class
+        super().update(config, direction, priority=True)