lib/eal/common/eal_common_launch.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <errno.h>
   6 #include <stdint.h>
   7 #include <stdio.h>
   8 #include <sys/queue.h>
   9
  10 #include <rte_launch.h>
  11 #include <rte_memory.h>
  12 #include <rte_eal.h>
  13 #include <rte_atomic.h>
  14 #include <rte_pause.h>
  15 #include <rte_per_lcore.h>
  16 #include <rte_lcore.h>
  17
  18 #include "eal_private.h"
  19
  20 /*
  21  * Wait until a lcore finished its job.
  22  */
  23 int
  24 rte_eal_wait_lcore(unsigned worker_id)
  25 {
  26         while (__atomic_load_n(&lcore_config[worker_id].state,
  27                                         __ATOMIC_ACQUIRE) != WAIT)
  28                 rte_pause();
  29
  30         return lcore_config[worker_id].ret;
  31 }
  32
  33 /*
  34  * Check that every WORKER lcores are in WAIT state, then call
  35  * rte_eal_remote_launch() for all of them. If call_main is true
  36  * (set to CALL_MAIN), also call the function on the main lcore.
  37  */
  38 int
  39 rte_eal_mp_remote_launch(int (*f)(void *), void *arg,
  40                          enum rte_rmt_call_main_t call_main)
  41 {
  42         int lcore_id;
  43         int main_lcore = rte_get_main_lcore();
  44
  45         /* check state of lcores */
  46         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  47                 if (lcore_config[lcore_id].state != WAIT)
  48                         return -EBUSY;
  49         }
  50
  51         /* send messages to cores */
  52         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  53                 rte_eal_remote_launch(f, arg, lcore_id);
  54         }
  55
  56         if (call_main == CALL_MAIN) {
  57                 lcore_config[main_lcore].ret = f(arg);
  58                 lcore_config[main_lcore].state = WAIT;
  59         }
  60
  61         return 0;
  62 }
  63
  64 /*
  65  * Return the state of the lcore identified by worker_id.
  66  */
  67 enum rte_lcore_state_t
  68 rte_eal_get_lcore_state(unsigned lcore_id)
  69 {
  70         return lcore_config[lcore_id].state;
  71 }
  72
  73 /*
  74  * Do a rte_eal_wait_lcore() for every lcore. The return values are
  75  * ignored.
  76  */
  77 void
  78 rte_eal_mp_wait_lcore(void)
  79 {
  80         unsigned lcore_id;
  81
  82         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  83                 rte_eal_wait_lcore(lcore_id);
  84         }
  85 }