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