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                 if (rte_lcore_id() == LCORE_ID_ANY)
  36                         return -1;
  37
  38                 lcore_id = (int)rte_lcore_id();
  39         }
  40
  41         return lcore_config[lcore_id].core_index;
  42 }
  43
  44 int rte_lcore_to_cpu_id(int lcore_id)
  45 {
  46         if (unlikely(lcore_id >= RTE_MAX_LCORE))
  47                 return -1;
  48
  49         if (lcore_id < 0) {
  50                 if (rte_lcore_id() == LCORE_ID_ANY)
  51                         return -1;
  52
  53                 lcore_id = (int)rte_lcore_id();
  54         }
  55
  56         return lcore_config[lcore_id].core_id;
  57 }
  58
  59 rte_cpuset_t rte_lcore_cpuset(unsigned int lcore_id)
  60 {
  61         return lcore_config[lcore_id].cpuset;
  62 }
  63
  64 enum rte_lcore_role_t
  65 rte_eal_lcore_role(unsigned int lcore_id)
  66 {
  67         struct rte_config *cfg = rte_eal_get_configuration();
  68
  69         if (lcore_id >= RTE_MAX_LCORE)
  70                 return ROLE_OFF;
  71         return cfg->lcore_role[lcore_id];
  72 }
  73
  74 int rte_lcore_is_enabled(unsigned int lcore_id)
  75 {
  76         struct rte_config *cfg = rte_eal_get_configuration();
  77
  78         if (lcore_id >= RTE_MAX_LCORE)
  79                 return 0;
  80         return cfg->lcore_role[lcore_id] == ROLE_RTE;
  81 }
  82
  83 unsigned int rte_get_next_lcore(unsigned int i, int skip_master, int wrap)
  84 {
  85         i++;
  86         if (wrap)
  87                 i %= RTE_MAX_LCORE;
  88
  89         while (i < RTE_MAX_LCORE) {
  90                 if (!rte_lcore_is_enabled(i) ||
  91                     (skip_master && (i == rte_get_master_lcore()))) {
  92                         i++;
  93                         if (wrap)
  94                                 i %= RTE_MAX_LCORE;
  95                         continue;
  96                 }
  97                 break;
  98         }
  99         return i;
 100 }
 101
 102 unsigned int
 103 rte_lcore_to_socket_id(unsigned int lcore_id)
 104 {
 105         return lcore_config[lcore_id].socket_id;
 106 }
 107
 108 static int
 109 socket_id_cmp(const void *a, const void *b)
 110 {
 111         const int *lcore_id_a = a;
 112         const int *lcore_id_b = b;
 113
 114         if (*lcore_id_a < *lcore_id_b)
 115                 return -1;
 116         if (*lcore_id_a > *lcore_id_b)
 117                 return 1;
 118         return 0;
 119 }
 120
 121 /*
 122  * Parse /sys/devices/system/cpu to get the number of physical and logical
 123  * processors on the machine. The function will fill the cpu_info
 124  * structure.
 125  */
 126 int
 127 rte_eal_cpu_init(void)
 128 {
 129         /* pointer to global configuration */
 130         struct rte_config *config = rte_eal_get_configuration();
 131         unsigned lcore_id;
 132         unsigned count = 0;
 133         unsigned int socket_id, prev_socket_id;
 134         int lcore_to_socket_id[RTE_MAX_LCORE];
 135
 136         /*
 137          * Parse the maximum set of logical cores, detect the subset of running
 138          * ones and enable them by default.
 139          */
 140         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
 141                 lcore_config[lcore_id].core_index = count;
 142
 143                 /* init cpuset for per lcore config */
 144                 CPU_ZERO(&lcore_config[lcore_id].cpuset);
 145
 146                 /* find socket first */
 147                 socket_id = eal_cpu_socket_id(lcore_id);
 148                 lcore_to_socket_id[lcore_id] = socket_id;
 149
 150                 if (eal_cpu_detected(lcore_id) == 0) {
 151                         config->lcore_role[lcore_id] = ROLE_OFF;
 152                         lcore_config[lcore_id].core_index = -1;
 153                         continue;
 154                 }
 155
 156                 /* By default, lcore 1:1 map to cpu id */
 157                 CPU_SET(lcore_id, &lcore_config[lcore_id].cpuset);
 158
 159                 /* By default, each detected core is enabled */
 160                 config->lcore_role[lcore_id] = ROLE_RTE;
 161                 lcore_config[lcore_id].core_role = ROLE_RTE;
 162                 lcore_config[lcore_id].core_id = eal_cpu_core_id(lcore_id);
 163                 lcore_config[lcore_id].socket_id = socket_id;
 164                 RTE_LOG(DEBUG, EAL, "Detected lcore %u as "
 165                                 "core %u on socket %u\n",
 166                                 lcore_id, lcore_config[lcore_id].core_id,
 167                                 lcore_config[lcore_id].socket_id);
 168                 count++;
 169         }
 170         for (; lcore_id < CPU_SETSIZE; lcore_id++) {
 171                 if (eal_cpu_detected(lcore_id) == 0)
 172                         continue;
 173                 RTE_LOG(DEBUG, EAL, "Skipped lcore %u as core %u on socket %u\n",
 174                         lcore_id, eal_cpu_core_id(lcore_id),
 175                         eal_cpu_socket_id(lcore_id));
 176         }
 177
 178         /* Set the count of enabled logical cores of the EAL configuration */
 179         config->lcore_count = count;
 180         RTE_LOG(DEBUG, EAL,
 181                 "Support maximum %u logical core(s) by configuration.\n",
 182                 RTE_MAX_LCORE);
 183         RTE_LOG(INFO, EAL, "Detected %u lcore(s)\n", config->lcore_count);
 184
 185         /* sort all socket id's in ascending order */
 186         qsort(lcore_to_socket_id, RTE_DIM(lcore_to_socket_id),
 187                         sizeof(lcore_to_socket_id[0]), socket_id_cmp);
 188
 189         prev_socket_id = -1;
 190         config->numa_node_count = 0;
 191         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
 192                 socket_id = lcore_to_socket_id[lcore_id];
 193                 if (socket_id != prev_socket_id)
 194                         config->numa_nodes[config->numa_node_count++] =
 195                                         socket_id;
 196                 prev_socket_id = socket_id;
 197         }
 198         RTE_LOG(INFO, EAL, "Detected %u NUMA nodes\n", config->numa_node_count);
 199
 200         return 0;
 201 }
 202
 203 unsigned int
 204 rte_socket_count(void)
 205 {
 206         const struct rte_config *config = rte_eal_get_configuration();
 207         return config->numa_node_count;
 208 }
 209
 210 int
 211 rte_socket_id_by_idx(unsigned int idx)
 212 {
 213         const struct rte_config *config = rte_eal_get_configuration();
 214         if (idx >= config->numa_node_count) {
 215                 rte_errno = EINVAL;
 216                 return -1;
 217         }
 218         return config->numa_nodes[idx];
 219 }