update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / spdk / dpdk / drivers / net / bnxt / tf_core / rand.c

diff --git a/ceph/src/spdk/dpdk/drivers/net/bnxt/tf_core/rand.c b/ceph/src/spdk/dpdk/drivers/net/bnxt/tf_core/rand.c
new file mode 100644 (file)
index 0000000..32028df
--- /dev/null
+++ b/ceph/src/spdk/dpdk/drivers/net/bnxt/tf_core/rand.c
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019-2020 Broadcom
+ * All rights reserved.
+ */
+
+/* Random Number Functions */
+
+#include <stdio.h>
+#include <stdint.h>
+#include "rand.h"
+
+#define TF_RAND_LFSR_INIT_VALUE 0xACE1u
+
+uint16_t lfsr = TF_RAND_LFSR_INIT_VALUE;
+uint32_t bit;
+
+/**
+ * Generates a 16 bit pseudo random number
+ *
+ * Returns:
+ *   uint16_t number
+ */
+uint16_t rand16(void)
+{
+       bit = ((lfsr >> 0) ^ (lfsr >> 2) ^ (lfsr >> 3) ^ (lfsr >> 5)) & 1;
+       return lfsr = (lfsr >> 1) | (bit << 15);
+}
+
+/**
+ * Generates a 32 bit pseudo random number
+ *
+ * Returns:
+ *   uint32_t number
+ */
+uint32_t rand32(void)
+{
+       return (rand16() << 16) | rand16();
+}
+
+/**
+ * Resets the seed used by the pseudo random number generator
+ */
+void rand_init(void)
+{
+       lfsr = TF_RAND_LFSR_INIT_VALUE;
+       bit = 0;
+}