librte_eal/common/rte_keepalive.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright 2015 Intel Shannon Ltd. All rights reserved.
   5  *
   6  *   Redistribution and use in source and binary forms, with or without
   7  *   modification, are permitted provided that the following conditions
   8  *   are met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above copyright
  13  *       notice, this list of conditions and the following disclaimer in
  14  *       the documentation and/or other materials provided with the
  15  *       distribution.
  16  *     * Neither the name of Intel Corporation nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <inttypes.h>
  34
  35 #include <rte_common.h>
  36 #include <rte_cycles.h>
  37 #include <rte_lcore.h>
  38 #include <rte_log.h>
  39 #include <rte_keepalive.h>
  40 #include <rte_malloc.h>
  41
  42 static void
  43 print_trace(const char *msg, struct rte_keepalive *keepcfg, int idx_core)
  44 {
  45         RTE_LOG(INFO, EAL, "%sLast seen %" PRId64 "ms ago.\n",
  46                 msg,
  47                 ((rte_rdtsc() - keepcfg->last_alive[idx_core])*1000)
  48                 / rte_get_tsc_hz()
  49               );
  50 }
  51
  52
  53 void
  54 rte_keepalive_dispatch_pings(__rte_unused void *ptr_timer,
  55         void *ptr_data)
  56 {
  57         struct rte_keepalive *keepcfg = ptr_data;
  58         int idx_core;
  59
  60         for (idx_core = 0; idx_core < RTE_KEEPALIVE_MAXCORES; idx_core++) {
  61                 if (keepcfg->active_cores[idx_core] == 0)
  62                         continue;
  63
  64                 switch (keepcfg->state_flags[idx_core]) {
  65                 case ALIVE: /* Alive */
  66                         keepcfg->state_flags[idx_core] = MISSING;
  67                         keepcfg->last_alive[idx_core] = rte_rdtsc();
  68                         break;
  69                 case MISSING: /* MIA */
  70                         print_trace("Core MIA. ", keepcfg, idx_core);
  71                         keepcfg->state_flags[idx_core] = DEAD;
  72                         break;
  73                 case DEAD: /* Dead */
  74                         keepcfg->state_flags[idx_core] = GONE;
  75                         print_trace("Core died. ", keepcfg, idx_core);
  76                         if (keepcfg->callback)
  77                                 keepcfg->callback(
  78                                         keepcfg->callback_data,
  79                                         idx_core
  80                                         );
  81                         break;
  82                 case GONE: /* Buried */
  83                         break;
  84                 }
  85         }
  86 }
  87
  88
  89 struct rte_keepalive *
  90 rte_keepalive_create(rte_keepalive_failure_callback_t callback,
  91         void *data)
  92 {
  93         struct rte_keepalive *keepcfg;
  94
  95         keepcfg = rte_zmalloc("RTE_EAL_KEEPALIVE",
  96                 sizeof(struct rte_keepalive),
  97                 RTE_CACHE_LINE_SIZE);
  98         if (keepcfg != NULL) {
  99                 keepcfg->callback = callback;
 100                 keepcfg->callback_data = data;
 101                 keepcfg->tsc_initial = rte_rdtsc();
 102                 keepcfg->tsc_mhz = rte_get_tsc_hz() / 1000;
 103         }
 104         return keepcfg;
 105 }
 106
 107
 108 void
 109 rte_keepalive_register_core(struct rte_keepalive *keepcfg, const int id_core)
 110 {
 111         if (id_core < RTE_KEEPALIVE_MAXCORES)
 112                 keepcfg->active_cores[id_core] = 1;
 113 }