lib/librte_eal/common/eal_common_lcore.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <unistd.h>
   6 #include <limits.h>
   7 #include <string.h>
   8
   9 #include <rte_errno.h>
  10 #include <rte_log.h>
  11 #include <rte_eal.h>
  12 #include <rte_lcore.h>
  13 #include <rte_common.h>
  14 #include <rte_debug.h>
  15
  16 #include "eal_private.h"
  17 #include "eal_thread.h"
  18
  19 unsigned int rte_get_master_lcore(void)
  20 {
  21         return rte_eal_get_configuration()->master_lcore;
  22 }
  23
  24 unsigned int rte_lcore_count(void)
  25 {
  26         return rte_eal_get_configuration()->lcore_count;
  27 }
  28
  29 int rte_lcore_index(int lcore_id)
  30 {
  31         if (unlikely(lcore_id >= RTE_MAX_LCORE))
  32                 return -1;
  33
  34         if (lcore_id < 0)
  35                 lcore_id = (int)rte_lcore_id();
  36
  37         return lcore_config[lcore_id].core_index;
  38 }
  39
  40 int rte_lcore_to_cpu_id(int lcore_id)
  41 {
  42         if (unlikely(lcore_id >= RTE_MAX_LCORE))
  43                 return -1;
  44
  45         if (lcore_id < 0)
  46                 lcore_id = (int)rte_lcore_id();
  47
  48         return lcore_config[lcore_id].core_id;
  49 }
  50
  51 rte_cpuset_t rte_lcore_cpuset(unsigned int lcore_id)
  52 {
  53         return lcore_config[lcore_id].cpuset;
  54 }
  55
  56 enum rte_lcore_role_t
  57 rte_eal_lcore_role(unsigned int lcore_id)
  58 {
  59         struct rte_config *cfg = rte_eal_get_configuration();
  60
  61         if (lcore_id >= RTE_MAX_LCORE)
  62                 return ROLE_OFF;
  63         return cfg->lcore_role[lcore_id];
  64 }
  65
  66 int rte_lcore_is_enabled(unsigned int lcore_id)
  67 {
  68         struct rte_config *cfg = rte_eal_get_configuration();
  69
  70         if (lcore_id >= RTE_MAX_LCORE)
  71                 return 0;
  72         return cfg->lcore_role[lcore_id] == ROLE_RTE;
  73 }
  74
  75 unsigned int rte_get_next_lcore(unsigned int i, int skip_master, int wrap)
  76 {
  77         i++;
  78         if (wrap)
  79                 i %= RTE_MAX_LCORE;
  80
  81         while (i < RTE_MAX_LCORE) {
  82                 if (!rte_lcore_is_enabled(i) ||
  83                     (skip_master && (i == rte_get_master_lcore()))) {
  84                         i++;
  85                         if (wrap)
  86                                 i %= RTE_MAX_LCORE;
  87                         continue;
  88                 }
  89                 break;
  90         }
  91         return i;
  92 }
  93
  94 unsigned int
  95 rte_lcore_to_socket_id(unsigned int lcore_id)
  96 {
  97         return lcore_config[lcore_id].socket_id;
  98 }
  99
 100 static int
 101 socket_id_cmp(const void *a, const void *b)
 102 {
 103         const int *lcore_id_a = a;
 104         const int *lcore_id_b = b;
 105
 106         if (*lcore_id_a < *lcore_id_b)
 107                 return -1;
 108         if (*lcore_id_a > *lcore_id_b)
 109                 return 1;
 110         return 0;
 111 }
 112
 113 /*
 114  * Parse /sys/devices/system/cpu to get the number of physical and logical
 115  * processors on the machine. The function will fill the cpu_info
 116  * structure.
 117  */
 118 int
 119 rte_eal_cpu_init(void)
 120 {
 121         /* pointer to global configuration */
 122         struct rte_config *config = rte_eal_get_configuration();
 123         unsigned lcore_id;
 124         unsigned count = 0;
 125         unsigned int socket_id, prev_socket_id;
 126         int lcore_to_socket_id[RTE_MAX_LCORE];
 127
 128         /*
 129          * Parse the maximum set of logical cores, detect the subset of running
 130          * ones and enable them by default.
 131          */
 132         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
 133                 lcore_config[lcore_id].core_index = count;
 134
 135                 /* init cpuset for per lcore config */
 136                 CPU_ZERO(&lcore_config[lcore_id].cpuset);
 137
 138                 /* find socket first */
 139                 socket_id = eal_cpu_socket_id(lcore_id);
 140                 lcore_to_socket_id[lcore_id] = socket_id;
 141
 142                 if (eal_cpu_detected(lcore_id) == 0) {
 143                         config->lcore_role[lcore_id] = ROLE_OFF;
 144                         lcore_config[lcore_id].core_index = -1;
 145                         continue;
 146                 }
 147
 148                 /* By default, lcore 1:1 map to cpu id */
 149                 CPU_SET(lcore_id, &lcore_config[lcore_id].cpuset);
 150
 151                 /* By default, each detected core is enabled */
 152                 config->lcore_role[lcore_id] = ROLE_RTE;
 153                 lcore_config[lcore_id].core_role = ROLE_RTE;
 154                 lcore_config[lcore_id].core_id = eal_cpu_core_id(lcore_id);
 155                 lcore_config[lcore_id].socket_id = socket_id;
 156                 RTE_LOG(DEBUG, EAL, "Detected lcore %u as "
 157                                 "core %u on socket %u\n",
 158                                 lcore_id, lcore_config[lcore_id].core_id,
 159                                 lcore_config[lcore_id].socket_id);
 160                 count++;
 161         }
 162         for (; lcore_id < CPU_SETSIZE; lcore_id++) {
 163                 if (eal_cpu_detected(lcore_id) == 0)
 164                         continue;
 165                 RTE_LOG(DEBUG, EAL, "Skipped lcore %u as core %u on socket %u\n",
 166                         lcore_id, eal_cpu_core_id(lcore_id),
 167                         eal_cpu_socket_id(lcore_id));
 168         }
 169
 170         /* Set the count of enabled logical cores of the EAL configuration */
 171         config->lcore_count = count;
 172         RTE_LOG(DEBUG, EAL,
 173                 "Support maximum %u logical core(s) by configuration.\n",
 174                 RTE_MAX_LCORE);
 175         RTE_LOG(INFO, EAL, "Detected %u lcore(s)\n", config->lcore_count);
 176
 177         /* sort all socket id's in ascending order */
 178         qsort(lcore_to_socket_id, RTE_DIM(lcore_to_socket_id),
 179                         sizeof(lcore_to_socket_id[0]), socket_id_cmp);
 180
 181         prev_socket_id = -1;
 182         config->numa_node_count = 0;
 183         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
 184                 socket_id = lcore_to_socket_id[lcore_id];
 185                 if (socket_id != prev_socket_id)
 186                         config->numa_nodes[config->numa_node_count++] =
 187                                         socket_id;
 188                 prev_socket_id = socket_id;
 189         }
 190         RTE_LOG(INFO, EAL, "Detected %u NUMA nodes\n", config->numa_node_count);
 191
 192         return 0;
 193 }
 194
 195 unsigned int
 196 rte_socket_count(void)
 197 {
 198         const struct rte_config *config = rte_eal_get_configuration();
 199         return config->numa_node_count;
 200 }
 201
 202 int
 203 rte_socket_id_by_idx(unsigned int idx)
 204 {
 205         const struct rte_config *config = rte_eal_get_configuration();
 206         if (idx >= config->numa_node_count) {
 207                 rte_errno = EINVAL;
 208                 return -1;
 209         }
 210         return config->numa_nodes[idx];
 211 }