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