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 map_shared_memory(const char *filename, const size_t mem_size, int flags)
  23 {
  24         void *retval;
  25         int fd = open(filename, flags, 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 static void *
  38 open_shared_memory(const char *filename, const size_t mem_size)
  39 {
  40         return map_shared_memory(filename, mem_size, O_RDWR);
  41 }
  42
  43 static void *
  44 create_shared_memory(const char *filename, const size_t mem_size)
  45 {
  46         return map_shared_memory(filename, mem_size, O_RDWR | O_CREAT);
  47 }
  48
  49 /*
  50  * No hugepage support on freebsd, but we dummy it, using contigmem driver
  51  */
  52 int
  53 eal_hugepage_info_init(void)
  54 {
  55         size_t sysctl_size;
  56         int num_buffers, fd, error;
  57         int64_t buffer_size;
  58         /* re-use the linux "internal config" structure for our memory data */
  59         struct hugepage_info *hpi = &internal_config.hugepage_info[0];
  60         struct hugepage_info *tmp_hpi;
  61         unsigned int i;
  62
  63         internal_config.num_hugepage_sizes = 1;
  64
  65         sysctl_size = sizeof(num_buffers);
  66         error = sysctlbyname("hw.contigmem.num_buffers", &num_buffers,
  67                         &sysctl_size, NULL, 0);
  68
  69         if (error != 0) {
  70                 RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.num_buffers\n");
  71                 return -1;
  72         }
  73
  74         sysctl_size = sizeof(buffer_size);
  75         error = sysctlbyname("hw.contigmem.buffer_size", &buffer_size,
  76                         &sysctl_size, NULL, 0);
  77
  78         if (error != 0) {
  79                 RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.buffer_size\n");
  80                 return -1;
  81         }
  82
  83         fd = open(CONTIGMEM_DEV, O_RDWR);
  84         if (fd < 0) {
  85                 RTE_LOG(ERR, EAL, "could not open "CONTIGMEM_DEV"\n");
  86                 return -1;
  87         }
  88
  89         if (buffer_size >= 1<<30)
  90                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dGB\n",
  91                                 num_buffers, (int)(buffer_size>>30));
  92         else if (buffer_size >= 1<<20)
  93                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dMB\n",
  94                                 num_buffers, (int)(buffer_size>>20));
  95         else
  96                 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dKB\n",
  97                                 num_buffers, (int)(buffer_size>>10));
  98
  99         strlcpy(hpi->hugedir, CONTIGMEM_DEV, sizeof(hpi->hugedir));
 100         hpi->hugepage_sz = buffer_size;
 101         hpi->num_pages[0] = num_buffers;
 102         hpi->lock_descriptor = fd;
 103
 104         /* for no shared files mode, do not create shared memory config */
 105         if (internal_config.no_shconf)
 106                 return 0;
 107
 108         tmp_hpi = create_shared_memory(eal_hugepage_info_path(),
 109                         sizeof(internal_config.hugepage_info));
 110         if (tmp_hpi == NULL ) {
 111                 RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
 112                 return -1;
 113         }
 114
 115         memcpy(tmp_hpi, hpi, sizeof(internal_config.hugepage_info));
 116
 117         /* we've copied file descriptors along with everything else, but they
 118          * will be invalid in secondary process, so overwrite them
 119          */
 120         for (i = 0; i < RTE_DIM(internal_config.hugepage_info); i++) {
 121                 struct hugepage_info *tmp = &tmp_hpi[i];
 122                 tmp->lock_descriptor = -1;
 123         }
 124
 125         if (munmap(tmp_hpi, sizeof(internal_config.hugepage_info)) < 0) {
 126                 RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n");
 127                 return -1;
 128         }
 129
 130         return 0;
 131 }
 132
 133 /* copy stuff from shared info into internal config */
 134 int
 135 eal_hugepage_info_read(void)
 136 {
 137         struct hugepage_info *hpi = &internal_config.hugepage_info[0];
 138         struct hugepage_info *tmp_hpi;
 139
 140         internal_config.num_hugepage_sizes = 1;
 141
 142         tmp_hpi = open_shared_memory(eal_hugepage_info_path(),
 143                                   sizeof(internal_config.hugepage_info));
 144         if (tmp_hpi == NULL) {
 145                 RTE_LOG(ERR, EAL, "Failed to open shared memory!\n");
 146                 return -1;
 147         }
 148
 149         memcpy(hpi, tmp_hpi, sizeof(internal_config.hugepage_info));
 150
 151         if (munmap(tmp_hpi, sizeof(internal_config.hugepage_info)) < 0) {
 152                 RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n");
 153                 return -1;
 154         }
 155         return 0;
 156 }