LXR dpdk/lib/librte_eal/freebsd/eal_hugepage

   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
  12#include "eal_private.h"
  13#include "eal_hugepages.h"
  14#include "eal_internal_cfg.h"
  15#include "eal_filesystem.h"
  16
  17#define CONTIGMEM_DEV "/dev/contigmem"
  18
  19/*
  20 * Uses mmap to create a shared memory area for storage of data
  21 * Used in this file to store the hugepage file map on disk
  22 */
  23static void *
  24map_shared_memory(const char *filename, const size_t mem_size, int flags)
  25{
  26        void *retval;
  27        int fd = open(filename, flags, 0600);
  28        if (fd < 0)
  29                return NULL;
  30        if (ftruncate(fd, mem_size) < 0) {
  31                close(fd);
  32                return NULL;
  33        }
  34        retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  35        close(fd);
  36        return retval;
  37}
  38
  39static void *
  40open_shared_memory(const char *filename, const size_t mem_size)
  41{
  42        return map_shared_memory(filename, mem_size, O_RDWR);
  43}
  44
  45static void *
  46create_shared_memory(const char *filename, const size_t mem_size)
  47{
  48        return map_shared_memory(filename, mem_size, O_RDWR | O_CREAT);
  49}
  50
  51/*
  52 * No hugepage support on freebsd, but we dummy it, using contigmem driver
  53 */
  54int
  55eal_hugepage_info_init(void)
  56{
  57        size_t sysctl_size;
  58        int num_buffers, fd, error;
  59        int64_t buffer_size;
  60        struct internal_config *internal_conf =
  61                eal_get_internal_configuration();
  62
  63        /* re-use the linux "internal config" structure for our memory data */
  64        struct hugepage_info *hpi = &internal_conf->hugepage_info[0];
  65        struct hugepage_info *tmp_hpi;
  66        unsigned int i;
  67
  68        internal_conf->num_hugepage_sizes = 1;
  69
  70        sysctl_size = sizeof(num_buffers);
  71        error = sysctlbyname("hw.contigmem.num_buffers", &num_buffers,
  72                        &sysctl_size, NULL, 0);
  73
  74        if (error != 0) {
  75                RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.num_buffers\n");
  76                return -1;
  77        }
  78
  79        sysctl_size = sizeof(buffer_size);
  80        error = sysctlbyname("hw.contigmem.buffer_size", &buffer_size,
  81                        &sysctl_size, NULL, 0);
  82
  83        if (error != 0) {
  84                RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.buffer_size\n");
  85                return -1;
  86        }
  87
  88        fd = open(CONTIGMEM_DEV, O_RDWR);
  89        if (fd < 0) {
  90                RTE_LOG(ERR, EAL, "could not open "CONTIGMEM_DEV"\n");
  91                return -1;
  92        }
  93
  94        if (buffer_size >= 1<<30)
  95                RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dGB\n",
  96                                num_buffers, (int)(buffer_size>>30));
  97        else if (buffer_size >= 1<<20)
  98                RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dMB\n",
  99                                num_buffers, (int)(buffer_size>>20));
 100        else
 101                RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dKB\n",
 102                                num_buffers, (int)(buffer_size>>10));
 103
 104        strlcpy(hpi->hugedir, CONTIGMEM_DEV, sizeof(hpi->hugedir));
 105        hpi->hugepage_sz = buffer_size;
 106        hpi->num_pages[0] = num_buffers;
 107        hpi->lock_descriptor = fd;
 108
 109        /* for no shared files mode, do not create shared memory config */
 110        if (internal_conf->no_shconf)
 111                return 0;
 112
 113        tmp_hpi = create_shared_memory(eal_hugepage_info_path(),
 114                        sizeof(internal_conf->hugepage_info));
 115        if (tmp_hpi == NULL ) {
 116                RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
 117                return -1;
 118        }
 119
 120        memcpy(tmp_hpi, hpi, sizeof(internal_conf->hugepage_info));
 121
 122        /* we've copied file descriptors along with everything else, but they
 123         * will be invalid in secondary process, so overwrite them
 124         */
 125        for (i = 0; i < RTE_DIM(internal_conf->hugepage_info); i++) {
 126                struct hugepage_info *tmp = &tmp_hpi[i];
 127                tmp->lock_descriptor = -1;
 128        }
 129
 130        if (munmap(tmp_hpi, sizeof(internal_conf->hugepage_info)) < 0) {
 131                RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n");
 132                return -1;
 133        }
 134
 135        return 0;
 136}
 137
 138/* copy stuff from shared info into internal config */
 139int
 140eal_hugepage_info_read(void)
 141{
 142        struct internal_config *internal_conf =
 143                eal_get_internal_configuration();
 144
 145        struct hugepage_info *hpi = &internal_conf->hugepage_info[0];
 146        struct hugepage_info *tmp_hpi;
 147
 148        internal_conf->num_hugepage_sizes = 1;
 149
 150        tmp_hpi = open_shared_memory(eal_hugepage_info_path(),
 151                                  sizeof(internal_conf->hugepage_info));
 152        if (tmp_hpi == NULL) {
 153                RTE_LOG(ERR, EAL, "Failed to open shared memory!\n");
 154                return -1;
 155        }
 156
 157        memcpy(hpi, tmp_hpi, sizeof(internal_conf->hugepage_info));
 158
 159        if (munmap(tmp_hpi, sizeof(internal_conf->hugepage_info)) < 0) {
 160                RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n");
 161                return -1;
 162        }
 163        return 0;
 164}
 165