1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2017 Intel Corporation 3 */ 4 5 #include <rte_common.h> 6 #include <rte_ethdev.h> 7 #include <rte_malloc.h> 8 #include <rte_metrics.h> 9 #include <rte_bitrate.h> 10 11 /* 12 * Persistent bit-rate data. 13 * @internal 14 */ 15 struct rte_stats_bitrate { 16 uint64_t last_ibytes; 17 uint64_t last_obytes; 18 uint64_t peak_ibits; 19 uint64_t peak_obits; 20 uint64_t mean_ibits; 21 uint64_t mean_obits; 22 uint64_t ewma_ibits; 23 uint64_t ewma_obits; 24 }; 25 26 struct rte_stats_bitrates { 27 struct rte_stats_bitrate port_stats[RTE_MAX_ETHPORTS]; 28 uint16_t id_stats_set; 29 }; 30 31 struct rte_stats_bitrates * 32 rte_stats_bitrate_create(void) 33 { 34 return rte_zmalloc(NULL, sizeof(struct rte_stats_bitrates), 35 RTE_CACHE_LINE_SIZE); 36 } 37 38 void 39 rte_stats_bitrate_free(struct rte_stats_bitrates *bitrate_data) 40 { 41 rte_free(bitrate_data); 42 } 43 44 int 45 rte_stats_bitrate_reg(struct rte_stats_bitrates *bitrate_data) 46 { 47 const char * const names[] = { 48 "ewma_bits_in", "ewma_bits_out", 49 "mean_bits_in", "mean_bits_out", 50 "peak_bits_in", "peak_bits_out", 51 }; 52 int return_value; 53 54 if (bitrate_data == NULL) 55 return -EINVAL; 56 57 return_value = rte_metrics_reg_names(&names[0], RTE_DIM(names)); 58 if (return_value >= 0) { 59 bitrate_data->id_stats_set = return_value; 60 return 0; 61 } 62 return return_value; 63 } 64 65 int 66 rte_stats_bitrate_calc(struct rte_stats_bitrates *bitrate_data, 67 uint16_t port_id) 68 { 69 struct rte_stats_bitrate *port_data; 70 struct rte_eth_stats eth_stats; 71 int ret_code; 72 uint64_t cnt_bits; 73 int64_t delta; 74 const int64_t alpha_percent = 20; 75 uint64_t values[6]; 76 int ret; 77 78 if (bitrate_data == NULL) 79 return -EINVAL; 80 81 ret_code = rte_eth_stats_get(port_id, ð_stats); 82 if (ret_code != 0) 83 return ret_code < 0 ? ret_code : -ret_code; 84 85 port_data = &bitrate_data->port_stats[port_id]; 86 87 /* Incoming bitrate. This is an iteratively calculated EWMA 88 * (Exponentially Weighted Moving Average) that uses a 89 * weighting factor of alpha_percent. An unsmoothed mean 90 * for just the current time delta is also calculated for the 91 * benefit of people who don't understand signal processing. 92 */ 93 cnt_bits = (eth_stats.ibytes - port_data->last_ibytes) << 3; 94 port_data->last_ibytes = eth_stats.ibytes; 95 if (cnt_bits > port_data->peak_ibits) 96 port_data->peak_ibits = cnt_bits; 97 delta = cnt_bits; 98 delta -= port_data->ewma_ibits; 99 /* The +-50 fixes integer rounding during division */ 100 if (delta > 0) 101 delta = (delta * alpha_percent + 50) / 100; 102 else 103 delta = (delta * alpha_percent - 50) / 100; 104 port_data->ewma_ibits += delta; 105 /* Integer roundoff prevents EWMA between 0 and (100/alpha_percent) 106 * ever reaching zero in no-traffic conditions 107 */ 108 if (cnt_bits == 0 && delta == 0) 109 port_data->ewma_ibits = 0; 110 port_data->mean_ibits = cnt_bits; 111 112 /* Outgoing bitrate (also EWMA) */ 113 cnt_bits = (eth_stats.obytes - port_data->last_obytes) << 3; 114 port_data->last_obytes = eth_stats.obytes; 115 if (cnt_bits > port_data->peak_obits) 116 port_data->peak_obits = cnt_bits; 117 delta = cnt_bits; 118 delta -= port_data->ewma_obits; 119 if (delta > 0) 120 delta = (delta * alpha_percent + 50) / 100; 121 else 122 delta = (delta * alpha_percent - 50) / 100; 123 port_data->ewma_obits += delta; 124 if (cnt_bits == 0 && delta == 0) 125 port_data->ewma_obits = 0; 126 port_data->mean_obits = cnt_bits; 127 128 values[0] = port_data->ewma_ibits; 129 values[1] = port_data->ewma_obits; 130 values[2] = port_data->mean_ibits; 131 values[3] = port_data->mean_obits; 132 values[4] = port_data->peak_ibits; 133 values[5] = port_data->peak_obits; 134 ret = rte_metrics_update_values(port_id, bitrate_data->id_stats_set, 135 values, RTE_DIM(values)); 136 if (ret < 0) 137 return ret; 138 139 return 0; 140 } 141