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         internal_config.num_hugepage_sizes = 1;
  51
  52         /* nothing more to be done for secondary */
  53         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
  54                 return 0;
  55
  56         sysctl_size = sizeof(num_buffers);
  57         error = sysctlbyname("hw.contigmem.num_buffers", &num_buffers,
  58                         &sysctl_size, NULL, 0);
  59
  60         if (error != 0) {
  61                 RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.num_buffers\n");
  62                 return -1;
  63         }
  64
  65         sysctl_size = sizeof(buffer_size);
  66         error = sysctlbyname("hw.contigmem.buffer_size", &buffer_size,
  67                         &sysctl_size, NULL, 0);
  68
  69         if (error != 0) {
  70                 RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.buffer_size\n");
  71                 return -1;
  72         }
  73
  74         fd = open(CONTIGMEM_DEV, O_RDWR);
  75         if (fd < 0) {
  76                 RTE_LOG(ERR, EAL, "could not open "CONTIGMEM_DEV"\n");
  77                 return -1;
  78         }
  79
  80         if (buffer_size >= 1<<30)
  81                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dGB\n",
  82                                 num_buffers, (int)(buffer_size>>30));
  83         else if (buffer_size >= 1<<20)
  84                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dMB\n",
  85                                 num_buffers, (int)(buffer_size>>20));
  86         else
  87                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dKB\n",
  88                                 num_buffers, (int)(buffer_size>>10));
  89
  90         hpi->hugedir = CONTIGMEM_DEV;
  91         hpi->hugepage_sz = buffer_size;
  92         hpi->num_pages[0] = num_buffers;
  93         hpi->lock_descriptor = fd;
  94
  95         tmp_hpi = create_shared_memory(eal_hugepage_info_path(),
  96                         sizeof(internal_config.hugepage_info));
  97         if (tmp_hpi == NULL ) {
  98                 RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
  99                 return -1;
 100         }
 101
 102         memcpy(tmp_hpi, hpi, sizeof(internal_config.hugepage_info));
 103
 104         if (munmap(tmp_hpi, sizeof(internal_config.hugepage_info)) < 0) {
 105                 RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n");
 106                 return -1;
 107         }
 108
 109         return 0;
 110 }