From 6af6482f5ab5040696635aa3f581427fb638fd1e Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Sun, 1 Jan 2023 22:06:12 +0100
Subject: qos: T4284: migrate percentaged bandwidth to absolute value in bit/s

---
 smoketest/configs/qos-basic      |  9 +++++++
 src/migration-scripts/qos/1-to-2 | 55 +++++++++++++++++++++++++++++++++++++---
 2 files changed, 61 insertions(+), 3 deletions(-)

diff --git a/smoketest/configs/qos-basic b/smoketest/configs/qos-basic
index f94a5650d..96fa7bef4 100644
--- a/smoketest/configs/qos-basic
+++ b/smoketest/configs/qos-basic
@@ -16,6 +16,11 @@ interfaces {
         traffic-policy {
             out MY-HTB
         }
+        vif 200 {
+            traffic-policy {
+                out foo-emulate
+            }
+        }
     }
     loopback lo {
     }
@@ -198,6 +203,10 @@ traffic-policy {
             queue-type fair-queue
         }
     }
+    network-emulator foo-emulate {
+        bandwidth 300mbit
+        burst 20000
+    }
 }
 // Warning: Do not remove the following line.
 // vyos-config-version: "broadcast-relay@1:cluster@1:config-management@1:conntrack@3:conntrack-sync@2:dhcp-relay@2:dhcp-server@6:dhcpv6-server@1:dns-forwarding@3:firewall@5:https@2:interfaces@22:ipoe-server@1:ipsec@5:isis@1:l2tp@3:lldp@1:mdns@1:nat@5:ntp@1:pppoe-server@5:pptp@2:qos@1:quagga@8:rpki@1:salt@1:snmp@2:ssh@2:sstp@3:system@21:vrrp@2:vyos-accel-ppp@2:wanloadbalance@3:webproxy@2:zone-policy@1"
diff --git a/src/migration-scripts/qos/1-to-2 b/src/migration-scripts/qos/1-to-2
index 240777574..6f4c08a50 100755
--- a/src/migration-scripts/qos/1-to-2
+++ b/src/migration-scripts/qos/1-to-2
@@ -15,7 +15,18 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from sys import argv,exit
+
+from vyos.base import Warning
 from vyos.configtree import ConfigTree
+from vyos.util import read_file
+
+def bandwidth_percent_to_val(interface, percent) -> int:
+    speed = read_file(f'/sys/class/net/{interface}/speed')
+    if not speed.isnumeric():
+        Warning('Interface speed cannot be determined (assuming 10 Mbit/s)')
+        speed = 10
+    speed = int(speed) *1000000 # convert to MBit/s
+    return speed * int(percent) // 100 # integer division
 
 if (len(argv) < 1):
     print("Must specify file name!")
@@ -52,7 +63,7 @@ if config.exists(['interfaces']):
         for interface in config.list_nodes(['interfaces', type]):
             interface_base = ['interfaces', type, interface, 'traffic-policy']
             tmp = get_qos(config, interface, interface_base)
-            if tmp: iface_config.append(tmp)
+            if tmp: iface_config.update(tmp)
 
             vif_path = ['interfaces', type, interface, 'vif']
             if config.exists(vif_path):
@@ -87,10 +98,16 @@ config.set(['qos'])
 config.copy(base, ['qos', 'policy'])
 config.delete(base)
 
-
 # TODO
 # - remove burst from network emulator
-# - convert rates to bits/s
+
+def change_cli_bandwidth(config, path):
+    if config.exists(path + ['bandwidth']):
+        bw = config.return_value(path + ['bandwidth'])
+        if bw.endswith('%'):
+            bw = bandwidth_percent_to_val(interface, bw.rstrip('%'))
+            config.set(path + ['bandwidth'], value=bw)
+    return
 
 # Now map the interface policy binding to the new CLI syntax
 for interface, interface_config in iface_config.items():
@@ -99,6 +116,38 @@ for interface, interface_config in iface_config.items():
     if 'egress' in interface_config:
         config.set(['qos', 'interface', interface, 'egress'], value=interface_config['egress'])
 
+    # QoS policy <-> interface binding is now established - we now can adjust some
+    # CLI values like bandwidth in percent
+    for direction in ['ingress', 'egress']:
+        if direction not in interface_config:
+            continue
+        # Convert % bandwidth values to absolute values
+        for policy in config.list_nodes(['qos', 'policy']):
+            for policy_name in config.list_nodes(['qos', 'policy', policy]):
+                if policy_name == interface_config[direction]:
+                    policy_base = ['qos', 'policy', policy, policy_name]
+                    # This is for the toplevel bandwidth node on a policy
+                    change_cli_bandwidth(config, policy_base)
+
+                    # This is for class based bandwidth value
+                    if config.exists(policy_base + ['class']):
+                        for cls in config.list_nodes(policy_base + ['class']):
+                            cls_base = policy_base + ['class', cls]
+                            change_cli_bandwidth(config, cls_base)
+
+                    # This is for the bandwidth value specified under the
+                    # policy "default" tree
+                    if config.exists(policy_base + ['default']):
+                        default_base = policy_base + ['default']
+                        change_cli_bandwidth(config, default_base)
+
+# Remove "burst" CLI node from network emulator
+netem_base = ['qos', 'policy', 'network-emulator']
+if config.exists(netem_base):
+    for policy_name in config.list_nodes(netem_base):
+        if config.exists(netem_base + [policy_name, 'burst']):
+            config.delete(netem_base + [policy_name, 'burst'])
+
 try:
     with open(file_name, 'w') as f:
         f.write(config.to_string())
-- 
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