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authorC.J. Collier <cjcollier@linuxfoundation.org>2016-06-14 07:54:47 -0700
committerC.J. Collier <cjcollier@linuxfoundation.org>2016-06-14 07:55:43 -0700
commit5129044dce1f85ce4950f31bcf90f3886466f06a (patch)
tree1c6269614c0c15ffef8451c58ae8f8b30a1bc804 /lib/librte_sched/rte_sched_common.h
parente04be89c2409570e0055b2cda60bd11395bb93b0 (diff)
Imported upstream release 16.04
* gbp import-orig ../dpdk-16.04.tar.xz Change-Id: Iac2196db782ba322f6974d8a752acc34ce5024c3 Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>
Diffstat (limited to 'lib/librte_sched/rte_sched_common.h')
-rw-r--r--lib/librte_sched/rte_sched_common.h129
1 files changed, 129 insertions, 0 deletions
diff --git a/lib/librte_sched/rte_sched_common.h b/lib/librte_sched/rte_sched_common.h
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+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __INCLUDE_RTE_SCHED_COMMON_H__
+#define __INCLUDE_RTE_SCHED_COMMON_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <sys/types.h>
+
+#define __rte_aligned_16 __attribute__((__aligned__(16)))
+
+static inline uint32_t
+rte_sched_min_val_2_u32(uint32_t x, uint32_t y)
+{
+ return (x < y)? x : y;
+}
+
+#if 0
+static inline uint32_t
+rte_min_pos_4_u16(uint16_t *x)
+{
+ uint32_t pos0, pos1;
+
+ pos0 = (x[0] <= x[1])? 0 : 1;
+ pos1 = (x[2] <= x[3])? 2 : 3;
+
+ return (x[pos0] <= x[pos1])? pos0 : pos1;
+}
+
+#else
+
+/* simplified version to remove branches with CMOV instruction */
+static inline uint32_t
+rte_min_pos_4_u16(uint16_t *x)
+{
+ uint32_t pos0 = 0;
+ uint32_t pos1 = 2;
+
+ if (x[1] <= x[0]) pos0 = 1;
+ if (x[3] <= x[2]) pos1 = 3;
+ if (x[pos1] <= x[pos0]) pos0 = pos1;
+
+ return pos0;
+}
+
+#endif
+
+/*
+ * Compute the Greatest Common Divisor (GCD) of two numbers.
+ * This implementation uses Euclid's algorithm:
+ * gcd(a, 0) = a
+ * gcd(a, b) = gcd(b, a mod b)
+ *
+ */
+static inline uint32_t
+rte_get_gcd(uint32_t a, uint32_t b)
+{
+ uint32_t c;
+
+ if (a == 0)
+ return b;
+ if (b == 0)
+ return a;
+
+ if (a < b) {
+ c = a;
+ a = b;
+ b = c;
+ }
+
+ while (b != 0) {
+ c = a % b;
+ a = b;
+ b = c;
+ }
+
+ return a;
+}
+
+/*
+ * Compute the Lowest Common Denominator (LCD) of two numbers.
+ * This implementation computes GCD first:
+ * LCD(a, b) = (a * b) / GCD(a, b)
+ *
+ */
+static inline uint32_t
+rte_get_lcd(uint32_t a, uint32_t b)
+{
+ return (a * b) / rte_get_gcd(a, b);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCLUDE_RTE_SCHED_COMMON_H__ */