lib/librte_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                lcore_config[worker_id].state != FINISHED)
  31                 rte_pause();
  32
  33         rte_rmb();
  34
  35         /* we are in finished state, go to wait state */
  36         lcore_config[worker_id].state = WAIT;
  37         return lcore_config[worker_id].ret;
  38 }
  39
  40 /*
  41  * Check that every WORKER lcores are in WAIT state, then call
  42  * rte_eal_remote_launch() for all of them. If call_main is true
  43  * (set to CALL_MAIN), also call the function on the main lcore.
  44  */
  45 int
  46 rte_eal_mp_remote_launch(int (*f)(void *), void *arg,
  47                          enum rte_rmt_call_main_t call_main)
  48 {
  49         int lcore_id;
  50         int main_lcore = rte_get_main_lcore();
  51
  52         /* check state of lcores */
  53         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  54                 if (lcore_config[lcore_id].state != WAIT)
  55                         return -EBUSY;
  56         }
  57
  58         /* send messages to cores */
  59         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  60                 rte_eal_remote_launch(f, arg, lcore_id);
  61         }
  62
  63         if (call_main == CALL_MAIN) {
  64                 lcore_config[main_lcore].ret = f(arg);
  65                 lcore_config[main_lcore].state = FINISHED;
  66         }
  67
  68         return 0;
  69 }
  70
  71 /*
  72  * Return the state of the lcore identified by worker_id.
  73  */
  74 enum rte_lcore_state_t
  75 rte_eal_get_lcore_state(unsigned lcore_id)
  76 {
  77         return lcore_config[lcore_id].state;
  78 }
  79
  80 /*
  81  * Do a rte_eal_wait_lcore() for every lcore. The return values are
  82  * ignored.
  83  */
  84 void
  85 rte_eal_mp_wait_lcore(void)
  86 {
  87         unsigned lcore_id;
  88
  89         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  90                 rte_eal_wait_lcore(lcore_id);
  91         }
  92 }