improve Stateful scheduler

Signed-off-by: Hanoh Haim <hhaim@cisco.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/src/utl_ipg_bucket.h b/src/utl_ipg_bucket.h
new file mode 100644
index 00000000..40108c98
--- /dev/null
+++ b/src/utl_ipg_bucket.h
@@ -0,0 +1,68 @@
+#ifndef IPG_BUCKET_H
+#define IPG_BUCKET_H
+
+/*
+ Hanoh Haim
+ Cisco Systems, Inc.
+*/
+
+/*
+Copyright (c) 2015-2015 Cisco Systems, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+
+class CCalcIpgDiff {
+
+public:
+    CCalcIpgDiff(double bucket_is_sec){
+        m_acc=0;
+        m_bucket_is_sec=bucket_is_sec;
+        m_cnt=0;
+    }
+
+    uint32_t do_calc(double ipg_sec){
+        uint32_t res;
+        double d_residue=(m_acc+ipg_sec);
+        double d_buckets = (d_residue/m_bucket_is_sec);
+        if (d_buckets< 1.0) {
+            m_acc+=ipg_sec;
+            m_cnt++;
+            if (m_cnt>30) {
+                m_cnt=0; /* move at least 1 bucket after 20 packets not to create Infinite loop in timer wheel*/
+                return(1);
+            }
+            return(0);
+        }
+        m_cnt=0;
+        if (d_buckets>(double)UINT32_MAX) {
+            d_buckets=(double)UINT32_MAX;
+        }
+        res=((uint32_t)d_buckets);
+        m_acc=(d_residue)-m_bucket_is_sec*(double)res;
+        return (res);
+    }
+
+private:
+
+    double m_acc;
+    double m_bucket_is_sec;
+    uint8_t m_cnt;
+
+};
+
+
+
+
+#endif