From 257e1ee70be3d57f898ddcd27660ddf56900e0a8 Mon Sep 17 00:00:00 2001
From: Shudong Zhou <shudongzhou@gmail.com>
Date: Tue, 23 Apr 2013 07:21:57 -0700
Subject: [PATCH] Do not flood packets on a switch in overload
---
.../java/net/floodlightcontroller/core/IOFSwitch.java | 8 ++++++++
.../java/net/floodlightcontroller/core/OFSwitchBase.java | 9 +++++++++
.../util/OFMessageDamperMockSwitch.java | 6 ++++++
3 files changed, 23 insertions(+)
diff --git a/src/main/java/net/floodlightcontroller/core/IOFSwitch.java b/src/main/java/net/floodlightcontroller/core/IOFSwitch.java
index 55195c66e..388349f2b 100644
--- a/src/main/java/net/floodlightcontroller/core/IOFSwitch.java
+++ b/src/main/java/net/floodlightcontroller/core/IOFSwitch.java
@@ -114,6 +114,14 @@ public interface IOFSwitch {
*/
public boolean inputThrottled(OFMessage ofm);
+ /**
+ * Return if the switch is currently overloaded. The definition of
+ * overload refers to excessive traffic in the control path, namely
+ * a high packet in rate.
+ * @return
+ */
+ boolean isOverloaded();
+
/**
* Write OFMessage to the output stream, subject to switch rate limiting.
* The message will be handed to the floodlightProvider for possible filtering
diff --git a/src/main/java/net/floodlightcontroller/core/OFSwitchBase.java b/src/main/java/net/floodlightcontroller/core/OFSwitchBase.java
index 3da2f4e9d..351e3717b 100644
--- a/src/main/java/net/floodlightcontroller/core/OFSwitchBase.java
+++ b/src/main/java/net/floodlightcontroller/core/OFSwitchBase.java
@@ -787,6 +787,15 @@ public abstract class OFSwitchBase implements IOFSwitch {
packetInRatePerPortThreshold = pktInPerPort;
}
+ /**
+ * Return if switch has exceeded the high threshold of packet in rate.
+ * @return
+ */
+ @Override
+ public boolean isOverloaded() {
+ return packetInThrottleEnabled;
+ }
+
/**
* Determine if this message should be dropped.
*
diff --git a/src/test/java/net/floodlightcontroller/util/OFMessageDamperMockSwitch.java b/src/test/java/net/floodlightcontroller/util/OFMessageDamperMockSwitch.java
index 650ead70d..1d1ff169b 100644
--- a/src/test/java/net/floodlightcontroller/util/OFMessageDamperMockSwitch.java
+++ b/src/test/java/net/floodlightcontroller/util/OFMessageDamperMockSwitch.java
@@ -439,4 +439,10 @@ public class OFMessageDamperMockSwitch implements IOFSwitch {
return false;
}
+ @Override
+ public boolean isOverloaded() {
+ // TODO Auto-generated method stub
+ return false;
+ }
+
}
--
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