feat(chart): set mtu for the pod overlay network (#5824)

Signed-off-by: SkalaNetworks <contact@skala.network>

Author: SkalaNetworks

charts/kube-ovn-v2/README.md

@@ -1404,7 +1404,7 @@ false
 true
 </pre>
 </td>
-			<td>Enable default gateway checks</td>
+			<td>Enable default gateway checks.</td>
 		</tr>
 		<tr>
 			<td>networking.pods.enableLogicalGateways</td>
@@ -1413,7 +1413,7 @@ true
 false
 </pre>
 </td>
-			<td>Enable logical gateways</td>
+			<td>Enable logical gateways.</td>
 		</tr>
 		<tr>
 			<td>networking.pods.gateways</td>
@@ -1442,6 +1442,15 @@ false
 </td>
 			<td>IPv6 gateway.</td>
 		</tr>
+		<tr>
+			<td>networking.pods.mtu</td>
+			<td>int</td>
+			<td><pre lang="json">
+0
+</pre>
+</td>
+			<td>MTU of the subnet. If set to 0, the MTU is auto-detected.</td>
+		</tr>
 		<tr>
 			<td>networking.pods.subnetName</td>
 			<td>string</td>

charts/kube-ovn-v2/templates/agent/agent-daemonset.yaml

@@ -116,6 +116,9 @@ spec:
           {{- else if eq .Values.networking.stack "IPv6" -}}
           {{ .Values.networking.services.cidr.v6 }}
           {{- end }}
+          {{- if (gt (int .Values.networking.pods.mtu) 0) }}
+          - --mtu={{ .Values.networking.pods.mtu  }}
+          {{- end }}
           - --dpdk-tunnel-iface={{- .Values.agent.dpdkTunnelInterface }}
           - --network-type={{- .Values.networking.tunnelType }}
           - --default-interface-name={{- .Values.networking.vlan.interfaceName }}
@@ -286,4 +289,4 @@ spec:
           - name: ovs-ipsec-keys
             hostPath:
               path: {{ .Values.ovsOvn.ovsIpsecKeysDirectory }}
-        {{- end }}
+        {{- end }}

charts/kube-ovn-v2/values.yaml

@@ -85,12 +85,16 @@ networking:
       # -- IPv6 gateway.
       # @section -- Network parameters of the CNI
       v6: "fd00:10:16::1"
-    # -- Enable default gateway checks
+    # -- Enable default gateway checks.
     # @section -- Network parameters of the CNI
     enableGatewayChecks: true
-    # -- Enable logical gateways
+    # -- Enable logical gateways.
     # @section -- Network parameters of the CNI
     enableLogicalGateways: false
+    # -- MTU of the subnet.
+    # If set to 0, the MTU is auto-detected.
+    # @section -- Network parameters of the CNI
+    mtu: 0
   # -- Configuration for the service subnet.
   # If .networking.stack is set to IPv4, only the .v4 key is used.
   # If .networking.stack is set to IPv6, only the .v6 key is used.