1 files changed, 58 insertions, 0 deletions
diff --git a/VNFs/DPPD-PROX/random.h b/VNFs/DPPD-PROX/random.h
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+++ b/VNFs/DPPD-PROX/random.h
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+/*
+// Copyright (c) 2010-2017 Intel Corporation
+//
+// 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.
+*/
+
+/*
+  This pseudorandom number generator is based on ref_xorshift128plus,
+  as implemented by reference_xorshift.h, which has been obtained
+  from https://sourceforge.net/projects/xorshift-cpp/
+
+  The licensing terms for reference_xorshift.h are reproduced below.
+
+  //  Written in 2014 by Ivo Doko (ivo.doko@gmail.com)
+  //  based on code written by Sebastiano Vigna (vigna@acm.org)
+  //  To the extent possible under law, the author has dedicated
+  //  all copyright and related and neighboring rights to this
+  //  software to the public domain worldwide. This software is
+  //  distributed without any warranty.
+  //  See <http://creativecommons.org/publicdomain/zero/1.0/>.
+*/
+
+#ifndef _RANDOM_H_
+#define _RANDOM_H_
+
+#include <rte_cycles.h>
+
+struct random {
+  uint64_t state[2];
+};
+
+static void random_init_seed(struct random *random)
+{
+  random->state[0] = rte_rdtsc();
+  random->state[1] = rte_rdtsc();
+}
+
+static uint64_t random_next(struct random *random)
+{
+  const uint64_t s0 = random->state[1];
+  const uint64_t s1 = random->state[0] ^ (random->state[0] << 23);
+
+  random->state[0] = random->state[1];
+  random->state[1] = (s1 ^ (s1 >> 18) ^ s0 ^ (s0 >> 5)) + s0;
+  return random->state[1];
+}
+
+#endif /* _RANDOM_H_ */