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