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 #include <dirent.h>
   9
  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 /*
  20  * Parse /sys/devices/system/cpu to get the number of physical and logical
  21  * processors on the machine. The function will fill the cpu_info
  22  * structure.
  23  */
  24 int
  25 rte_eal_cpu_init(void)
  26 {
  27         /* pointer to global configuration */
  28         struct rte_config *config = rte_eal_get_configuration();
  29         unsigned lcore_id;
  30         unsigned count = 0;
  31
  32         /*
  33          * Parse the maximum set of logical cores, detect the subset of running
  34          * ones and enable them by default.
  35          */
  36         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
  37                 lcore_config[lcore_id].core_index = count;
  38
  39                 /* init cpuset for per lcore config */
  40                 CPU_ZERO(&lcore_config[lcore_id].cpuset);
  41
  42                 /* in 1:1 mapping, record related cpu detected state */
  43                 lcore_config[lcore_id].detected = eal_cpu_detected(lcore_id);
  44                 if (lcore_config[lcore_id].detected == 0) {
  45                         config->lcore_role[lcore_id] = ROLE_OFF;
  46                         lcore_config[lcore_id].core_index = -1;
  47                         continue;
  48                 }
  49
  50                 /* By default, lcore 1:1 map to cpu id */
  51                 CPU_SET(lcore_id, &lcore_config[lcore_id].cpuset);
  52
  53                 /* By default, each detected core is enabled */
  54                 config->lcore_role[lcore_id] = ROLE_RTE;
  55                 lcore_config[lcore_id].core_role = ROLE_RTE;
  56                 lcore_config[lcore_id].core_id = eal_cpu_core_id(lcore_id);
  57                 lcore_config[lcore_id].socket_id = eal_cpu_socket_id(lcore_id);
  58                 if (lcore_config[lcore_id].socket_id >= RTE_MAX_NUMA_NODES) {
  59 #ifdef RTE_EAL_ALLOW_INV_SOCKET_ID
  60                         lcore_config[lcore_id].socket_id = 0;
  61 #else
  62                         RTE_LOG(ERR, EAL, "Socket ID (%u) is greater than "
  63                                 "RTE_MAX_NUMA_NODES (%d)\n",
  64                                 lcore_config[lcore_id].socket_id,
  65                                 RTE_MAX_NUMA_NODES);
  66                         return -1;
  67 #endif
  68                 }
  69                 RTE_LOG(DEBUG, EAL, "Detected lcore %u as "
  70                                 "core %u on socket %u\n",
  71                                 lcore_id, lcore_config[lcore_id].core_id,
  72                                 lcore_config[lcore_id].socket_id);
  73                 count++;
  74         }
  75         /* Set the count of enabled logical cores of the EAL configuration */
  76         config->lcore_count = count;
  77         RTE_LOG(DEBUG, EAL,
  78                 "Support maximum %u logical core(s) by configuration.\n",
  79                 RTE_MAX_LCORE);
  80         RTE_LOG(INFO, EAL, "Detected %u lcore(s)\n", config->lcore_count);
  81
  82         return 0;
  83 }