ceph/src/seastar/dpdk/lib/librte_eal/bsdapp/eal/eal_lcore.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <unistd.h>
  35 #include <sys/sysctl.h>
  36
  37 #include <rte_log.h>
  38 #include <rte_eal.h>
  39 #include <rte_lcore.h>
  40 #include <rte_common.h>
  41 #include <rte_debug.h>
  42
  43 #include "eal_private.h"
  44 #include "eal_thread.h"
  45
  46 /* No topology information available on FreeBSD including NUMA info */
  47 unsigned
  48 eal_cpu_core_id(__rte_unused unsigned lcore_id)
  49 {
  50         return 0;
  51 }
  52
  53 static int
  54 eal_get_ncpus(void)
  55 {
  56         static int ncpu = -1;
  57         int mib[2] = {CTL_HW, HW_NCPU};
  58         size_t len = sizeof(ncpu);
  59
  60         if (ncpu < 0) {
  61                 sysctl(mib, 2, &ncpu, &len, NULL, 0);
  62                 RTE_LOG(INFO, EAL, "Sysctl reports %d cpus\n", ncpu);
  63         }
  64         return ncpu;
  65 }
  66
  67 unsigned
  68 eal_cpu_socket_id(__rte_unused unsigned cpu_id)
  69 {
  70         return 0;
  71 }
  72
  73 /* Check if a cpu is present by the presence of the
  74  * cpu information for it.
  75  */
  76 int
  77 eal_cpu_detected(unsigned lcore_id)
  78 {
  79         const unsigned ncpus = eal_get_ncpus();
  80         return lcore_id < ncpus;
  81 }