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         if (lcore_config[worker_id].state == WAIT)
  27                 return 0;
  28
  29         while (lcore_config[worker_id].state != WAIT)
  30                 rte_pause();
  31
  32         rte_rmb();
  33
  34         return lcore_config[worker_id].ret;
  35 }
  36
  37 /*
  38  * Check that every WORKER lcores are in WAIT state, then call
  39  * rte_eal_remote_launch() for all of them. If call_main is true
  40  * (set to CALL_MAIN), also call the function on the main lcore.
  41  */
  42 int
  43 rte_eal_mp_remote_launch(int (*f)(void *), void *arg,
  44                          enum rte_rmt_call_main_t call_main)
  45 {
  46         int lcore_id;
  47         int main_lcore = rte_get_main_lcore();
  48
  49         /* check state of lcores */
  50         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  51                 if (lcore_config[lcore_id].state != WAIT)
  52                         return -EBUSY;
  53         }
  54
  55         /* send messages to cores */
  56         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  57                 rte_eal_remote_launch(f, arg, lcore_id);
  58         }
  59
  60         if (call_main == CALL_MAIN) {
  61                 lcore_config[main_lcore].ret = f(arg);
  62                 lcore_config[main_lcore].state = WAIT;
  63         }
  64
  65         return 0;
  66 }
  67
  68 /*
  69  * Return the state of the lcore identified by worker_id.
  70  */
  71 enum rte_lcore_state_t
  72 rte_eal_get_lcore_state(unsigned lcore_id)
  73 {
  74         return lcore_config[lcore_id].state;
  75 }
  76
  77 /*
  78  * Do a rte_eal_wait_lcore() for every lcore. The return values are
  79  * ignored.
  80  */
  81 void
  82 rte_eal_mp_wait_lcore(void)
  83 {
  84         unsigned lcore_id;
  85
  86         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  87                 rte_eal_wait_lcore(lcore_id);
  88         }
  89 }