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Diffstat (limited to 'src/dpdk_lib18/librte_sched/rte_sched_common.h')
| -rwxr-xr-x | src/dpdk_lib18/librte_sched/rte_sched_common.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/src/dpdk_lib18/librte_sched/rte_sched_common.h b/src/dpdk_lib18/librte_sched/rte_sched_common.h new file mode 100755 index 00000000..8920adec --- /dev/null +++ b/src/dpdk_lib18/librte_sched/rte_sched_common.h @@ -0,0 +1,129 @@ +/*- + * 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__ */ |