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 int rte_lcore_index(int lcore_id)
  20 {
  21         if (unlikely(lcore_id >= RTE_MAX_LCORE))
  22                 return -1;
  23
  24         if (lcore_id < 0)
  25                 lcore_id = (int)rte_lcore_id();
  26
  27         return lcore_config[lcore_id].core_index;
  28 }
  29
  30 int rte_lcore_to_cpu_id(int lcore_id)
  31 {
  32         if (unlikely(lcore_id >= RTE_MAX_LCORE))
  33                 return -1;
  34
  35         if (lcore_id < 0)
  36                 lcore_id = (int)rte_lcore_id();
  37
  38         return lcore_config[lcore_id].core_id;
  39 }
  40
  41 rte_cpuset_t rte_lcore_cpuset(unsigned int lcore_id)
  42 {
  43         return lcore_config[lcore_id].cpuset;
  44 }
  45
  46 unsigned int
  47 rte_lcore_to_socket_id(unsigned int lcore_id)
  48 {
  49         return lcore_config[lcore_id].socket_id;
  50 }
  51
  52 static int
  53 socket_id_cmp(const void *a, const void *b)
  54 {
  55         const int *lcore_id_a = a;
  56         const int *lcore_id_b = b;
  57
  58         if (*lcore_id_a < *lcore_id_b)
  59                 return -1;
  60         if (*lcore_id_a > *lcore_id_b)
  61                 return 1;
  62         return 0;
  63 }
  64
  65 /*
  66  * Parse /sys/devices/system/cpu to get the number of physical and logical
  67  * processors on the machine. The function will fill the cpu_info
  68  * structure.
  69  */
  70 int
  71 rte_eal_cpu_init(void)
  72 {
  73         /* pointer to global configuration */
  74         struct rte_config *config = rte_eal_get_configuration();
  75         unsigned lcore_id;
  76         unsigned count = 0;
  77         unsigned int socket_id, prev_socket_id;
  78         int lcore_to_socket_id[RTE_MAX_LCORE];
  79
  80         /*
  81          * Parse the maximum set of logical cores, detect the subset of running
  82          * ones and enable them by default.
  83          */
  84         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
  85                 lcore_config[lcore_id].core_index = count;
  86
  87                 /* init cpuset for per lcore config */
  88                 CPU_ZERO(&lcore_config[lcore_id].cpuset);
  89
  90                 /* find socket first */
  91                 socket_id = eal_cpu_socket_id(lcore_id);
  92                 if (socket_id >= RTE_MAX_NUMA_NODES) {
  93 #ifdef RTE_EAL_ALLOW_INV_SOCKET_ID
  94                         socket_id = 0;
  95 #else
  96                         RTE_LOG(ERR, EAL, "Socket ID (%u) is greater than RTE_MAX_NUMA_NODES (%d)\n",
  97                                         socket_id, RTE_MAX_NUMA_NODES);
  98                         return -1;
  99 #endif
 100                 }
 101                 lcore_to_socket_id[lcore_id] = socket_id;
 102
 103                 /* in 1:1 mapping, record related cpu detected state */
 104                 lcore_config[lcore_id].detected = eal_cpu_detected(lcore_id);
 105                 if (lcore_config[lcore_id].detected == 0) {
 106                         config->lcore_role[lcore_id] = ROLE_OFF;
 107                         lcore_config[lcore_id].core_index = -1;
 108                         continue;
 109                 }
 110
 111                 /* By default, lcore 1:1 map to cpu id */
 112                 CPU_SET(lcore_id, &lcore_config[lcore_id].cpuset);
 113
 114                 /* By default, each detected core is enabled */
 115                 config->lcore_role[lcore_id] = ROLE_RTE;
 116                 lcore_config[lcore_id].core_role = ROLE_RTE;
 117                 lcore_config[lcore_id].core_id = eal_cpu_core_id(lcore_id);
 118                 lcore_config[lcore_id].socket_id = socket_id;
 119                 RTE_LOG(DEBUG, EAL, "Detected lcore %u as "
 120                                 "core %u on socket %u\n",
 121                                 lcore_id, lcore_config[lcore_id].core_id,
 122                                 lcore_config[lcore_id].socket_id);
 123                 count++;
 124         }
 125         /* Set the count of enabled logical cores of the EAL configuration */
 126         config->lcore_count = count;
 127         RTE_LOG(DEBUG, EAL,
 128                 "Support maximum %u logical core(s) by configuration.\n",
 129                 RTE_MAX_LCORE);
 130         RTE_LOG(INFO, EAL, "Detected %u lcore(s)\n", config->lcore_count);
 131
 132         /* sort all socket id's in ascending order */
 133         qsort(lcore_to_socket_id, RTE_DIM(lcore_to_socket_id),
 134                         sizeof(lcore_to_socket_id[0]), socket_id_cmp);
 135
 136         prev_socket_id = -1;
 137         config->numa_node_count = 0;
 138         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
 139                 socket_id = lcore_to_socket_id[lcore_id];
 140                 if (socket_id != prev_socket_id)
 141                         config->numa_nodes[config->numa_node_count++] =
 142                                         socket_id;
 143                 prev_socket_id = socket_id;
 144         }
 145         RTE_LOG(INFO, EAL, "Detected %u NUMA nodes\n", config->numa_node_count);
 146
 147         return 0;
 148 }
 149
 150 unsigned int
 151 rte_socket_count(void)
 152 {
 153         const struct rte_config *config = rte_eal_get_configuration();
 154         return config->numa_node_count;
 155 }
 156
 157 int
 158 rte_socket_id_by_idx(unsigned int idx)
 159 {
 160         const struct rte_config *config = rte_eal_get_configuration();
 161         if (idx >= config->numa_node_count) {
 162                 rte_errno = EINVAL;
 163                 return -1;
 164         }
 165         return config->numa_nodes[idx];
 166 }