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_errno.h>
  11 #include <rte_log.h>
  12 #include <rte_eal.h>
  13 #include <rte_lcore.h>
  14 #include <rte_common.h>
  15 #include <rte_debug.h>
  16
  17 #include "eal_private.h"
  18 #include "eal_thread.h"
  19
  20 static int
  21 socket_id_cmp(const void *a, const void *b)
  22 {
  23         const int *lcore_id_a = a;
  24         const int *lcore_id_b = b;
  25
  26         if (*lcore_id_a < *lcore_id_b)
  27                 return -1;
  28         if (*lcore_id_a > *lcore_id_b)
  29                 return 1;
  30         return 0;
  31 }
  32
  33 /*
  34  * Parse /sys/devices/system/cpu to get the number of physical and logical
  35  * processors on the machine. The function will fill the cpu_info
  36  * structure.
  37  */
  38 int
  39 rte_eal_cpu_init(void)
  40 {
  41         /* pointer to global configuration */
  42         struct rte_config *config = rte_eal_get_configuration();
  43         unsigned lcore_id;
  44         unsigned count = 0;
  45         unsigned int socket_id, prev_socket_id;
  46         int lcore_to_socket_id[RTE_MAX_LCORE];
  47
  48         /*
  49          * Parse the maximum set of logical cores, detect the subset of running
  50          * ones and enable them by default.
  51          */
  52         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
  53                 lcore_config[lcore_id].core_index = count;
  54
  55                 /* init cpuset for per lcore config */
  56                 CPU_ZERO(&lcore_config[lcore_id].cpuset);
  57
  58                 /* find socket first */
  59                 socket_id = eal_cpu_socket_id(lcore_id);
  60                 if (socket_id >= RTE_MAX_NUMA_NODES) {
  61 #ifdef RTE_EAL_ALLOW_INV_SOCKET_ID
  62                         socket_id = 0;
  63 #else
  64                         RTE_LOG(ERR, EAL, "Socket ID (%u) is greater than RTE_MAX_NUMA_NODES (%d)\n",
  65                                         socket_id, RTE_MAX_NUMA_NODES);
  66                         return -1;
  67 #endif
  68                 }
  69                 lcore_to_socket_id[lcore_id] = socket_id;
  70
  71                 /* in 1:1 mapping, record related cpu detected state */
  72                 lcore_config[lcore_id].detected = eal_cpu_detected(lcore_id);
  73                 if (lcore_config[lcore_id].detected == 0) {
  74                         config->lcore_role[lcore_id] = ROLE_OFF;
  75                         lcore_config[lcore_id].core_index = -1;
  76                         continue;
  77                 }
  78
  79                 /* By default, lcore 1:1 map to cpu id */
  80                 CPU_SET(lcore_id, &lcore_config[lcore_id].cpuset);
  81
  82                 /* By default, each detected core is enabled */
  83                 config->lcore_role[lcore_id] = ROLE_RTE;
  84                 lcore_config[lcore_id].core_role = ROLE_RTE;
  85                 lcore_config[lcore_id].core_id = eal_cpu_core_id(lcore_id);
  86                 lcore_config[lcore_id].socket_id = socket_id;
  87                 RTE_LOG(DEBUG, EAL, "Detected lcore %u as "
  88                                 "core %u on socket %u\n",
  89                                 lcore_id, lcore_config[lcore_id].core_id,
  90                                 lcore_config[lcore_id].socket_id);
  91                 count++;
  92         }
  93         /* Set the count of enabled logical cores of the EAL configuration */
  94         config->lcore_count = count;
  95         RTE_LOG(DEBUG, EAL,
  96                 "Support maximum %u logical core(s) by configuration.\n",
  97                 RTE_MAX_LCORE);
  98         RTE_LOG(INFO, EAL, "Detected %u lcore(s)\n", config->lcore_count);
  99
 100         /* sort all socket id's in ascending order */
 101         qsort(lcore_to_socket_id, RTE_DIM(lcore_to_socket_id),
 102                         sizeof(lcore_to_socket_id[0]), socket_id_cmp);
 103
 104         prev_socket_id = -1;
 105         config->numa_node_count = 0;
 106         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
 107                 socket_id = lcore_to_socket_id[lcore_id];
 108                 if (socket_id != prev_socket_id)
 109                         config->numa_nodes[config->numa_node_count++] =
 110                                         socket_id;
 111                 prev_socket_id = socket_id;
 112         }
 113         RTE_LOG(INFO, EAL, "Detected %u NUMA nodes\n", config->numa_node_count);
 114
 115         return 0;
 116 }
 117
 118 unsigned int __rte_experimental
 119 rte_socket_count(void)
 120 {
 121         const struct rte_config *config = rte_eal_get_configuration();
 122         return config->numa_node_count;
 123 }
 124
 125 int __rte_experimental
 126 rte_socket_id_by_idx(unsigned int idx)
 127 {
 128         const struct rte_config *config = rte_eal_get_configuration();
 129         if (idx >= config->numa_node_count) {
 130                 rte_errno = EINVAL;
 131                 return -1;
 132         }
 133         return config->numa_nodes[idx];
 134 }