lib/librte_eal/bsdapp/eal/eal_hugepage_info.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4 #include <sys/types.h>
   5 #include <sys/sysctl.h>
   6 #include <sys/mman.h>
   7 #include <string.h>
   8
   9 #include <rte_log.h>
  10 #include <fcntl.h>
  11 #include "eal_hugepages.h"
  12 #include "eal_internal_cfg.h"
  13 #include "eal_filesystem.h"
  14
  15 #define CONTIGMEM_DEV "/dev/contigmem"
  16
  17 /*
  18  * Uses mmap to create a shared memory area for storage of data
  19  * Used in this file to store the hugepage file map on disk
  20  */
  21 static void *
  22 create_shared_memory(const char *filename, const size_t mem_size)
  23 {
  24         void *retval;
  25         int fd = open(filename, O_CREAT | O_RDWR, 0666);
  26         if (fd < 0)
  27                 return NULL;
  28         if (ftruncate(fd, mem_size) < 0) {
  29                 close(fd);
  30                 return NULL;
  31         }
  32         retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  33         close(fd);
  34         return retval;
  35 }
  36
  37 /*
  38  * No hugepage support on freebsd, but we dummy it, using contigmem driver
  39  */
  40 int
  41 eal_hugepage_info_init(void)
  42 {
  43         size_t sysctl_size;
  44         int num_buffers, fd, error;
  45         int64_t buffer_size;
  46         /* re-use the linux "internal config" structure for our memory data */
  47         struct hugepage_info *hpi = &internal_config.hugepage_info[0];
  48         struct hugepage_info *tmp_hpi;
  49
  50         sysctl_size = sizeof(num_buffers);
  51         error = sysctlbyname("hw.contigmem.num_buffers", &num_buffers,
  52                         &sysctl_size, NULL, 0);
  53
  54         if (error != 0) {
  55                 RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.num_buffers");
  56                 return -1;
  57         }
  58
  59         sysctl_size = sizeof(buffer_size);
  60         error = sysctlbyname("hw.contigmem.buffer_size", &buffer_size,
  61                         &sysctl_size, NULL, 0);
  62
  63         if (error != 0) {
  64                 RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.buffer_size");
  65                 return -1;
  66         }
  67
  68         fd = open(CONTIGMEM_DEV, O_RDWR);
  69         if (fd < 0) {
  70                 RTE_LOG(ERR, EAL, "could not open "CONTIGMEM_DEV"\n");
  71                 return -1;
  72         }
  73
  74         if (buffer_size >= 1<<30)
  75                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dGB\n",
  76                                 num_buffers, (int)(buffer_size>>30));
  77         else if (buffer_size >= 1<<20)
  78                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dMB\n",
  79                                 num_buffers, (int)(buffer_size>>20));
  80         else
  81                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dKB\n",
  82                                 num_buffers, (int)(buffer_size>>10));
  83
  84         internal_config.num_hugepage_sizes = 1;
  85         hpi->hugedir = CONTIGMEM_DEV;
  86         hpi->hugepage_sz = buffer_size;
  87         hpi->num_pages[0] = num_buffers;
  88         hpi->lock_descriptor = fd;
  89
  90         tmp_hpi = create_shared_memory(eal_hugepage_info_path(),
  91                                         sizeof(struct hugepage_info));
  92         if (tmp_hpi == NULL ) {
  93                 RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
  94                 return -1;
  95         }
  96
  97         memcpy(tmp_hpi, hpi, sizeof(struct hugepage_info));
  98
  99         if ( munmap(tmp_hpi, sizeof(struct hugepage_info)) < 0) {
 100                 RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n");
 101                 return -1;
 102         }
 103
 104         return 0;
 105 }