T5974: Fix QoS shape bandwidth and ceil calculation for default

The default `bandwidth` and `ceiling` should calculate values
based on <tag> bandwidth but currently it gets the value from
qos.base `/sys/class/net/{self._interface}/speed`

```
set qos policy shaper SHAPER bandwidth '20mbit'
set qos policy shaper SHAPER default bandwidth '95%'
set qos policy shaper SHAPER default ceiling '100%'
```

It causes wrong calculations for class `default` i.e
950Mbit for bandwidth (expected 95% of bandwidth, 19Mbit)
1Gbit for ceil (expected 100% of bandwidth, 20Mbit)

Gets incorrect values
```
r4# tc class show dev eth1
class htb 1:1 root rate 20Mbit ceil 20Mbit burst 1600b cburst 1600b
class htb 1:a parent 1:1 leaf 8053: prio 0 rate 200Kbit ceil 200Kbit burst 1Mb cburst 1600b
class htb 1:b parent 1:1 leaf 8054: prio 7 rate 950Mbit ceil 1Gbit burst 15200b cburst 1375b
```

Fix this

(cherry picked from commit 6ddfe6328e1cbdde1b70763b39e3a87f8374755a)

1 files changed, 10 insertions, 2 deletions

diff --git a/python/vyos/qos/trafficshaper.py b/python/vyos/qos/trafficshaper.py
index 1f3b03680..d6705cc77 100644
--- a/python/vyos/qos/trafficshaper.py
+++ b/python/vyos/qos/trafficshaper.py
@@ -99,7 +99,11 @@ class TrafficShaper(QoSBase):
                 self._cmd(tmp)
 
         if 'default' in config:
-                rate = self._rate_convert(config['default']['bandwidth'])
+                if config['default']['bandwidth'].endswith('%'):
+                    percent = config['default']['bandwidth'].rstrip('%')
+                    rate = self._rate_convert(config['bandwidth']) * int(percent) // 100
+                else:
+                    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}'
@@ -107,7 +111,11 @@ class TrafficShaper(QoSBase):
                     priority = config['default']['priority']
                     tmp += f' prio {priority}'
                 if 'ceiling' in config['default']:
-                    f_ceil = self._rate_convert(config['default']['ceiling'])
+                    if config['default']['ceiling'].endswith('%'):
+                        percent = config['default']['ceiling'].rstrip('%')
+                        f_ceil = self._rate_convert(config['bandwidth']) * int(percent) // 100
+                    else:
+                        f_ceil = self._rate_convert(config['default']['ceiling'])
                     tmp += f' ceil {f_ceil}'
                 self._cmd(tmp)