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Diffstat (limited to 'lib/librte_eal/linuxapp/eal/eal_memory.c')
-rw-r--r--lib/librte_eal/linuxapp/eal/eal_memory.c796
1 files changed, 796 insertions, 0 deletions
diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
new file mode 100644
index 0000000..a47dab4
--- /dev/null
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -0,0 +1,796 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * version: DPDK.L.1.2.3-3
+ */
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdarg.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/queue.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_launch.h>
+#include <rte_tailq.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_common.h>
+#include <rte_string_fns.h>
+
+#include "eal_private.h"
+#include "eal_internal_cfg.h"
+#include "eal_fs_paths.h"
+#include "eal_hugepages.h"
+
+/**
+ * @file
+ * Huge page mapping under linux
+ *
+ * To reserve a big contiguous amount of memory, we use the hugepage
+ * feature of linux. For that, we need to have hugetlbfs mounted. This
+ * code will create many files in this directory (one per page) and
+ * map them in virtual memory. For each page, we will retrieve its
+ * physical address and remap it in order to have a virtual contiguous
+ * zone as well as a physical contiguous zone.
+ */
+
+
+#define RANDOMIZE_VA_SPACE_FILE "/proc/sys/kernel/randomize_va_space"
+
+/*
+ * Check whether address-space layout randomization is enabled in
+ * the kernel. This is important for multi-process as it can prevent
+ * two processes mapping data to the same virtual address
+ * Returns:
+ * 0 - address space randomization disabled
+ * 1/2 - address space randomization enabled
+ * negative error code on error
+ */
+static int
+aslr_enabled(void)
+{
+ char c;
+ int retval, fd = open(RANDOMIZE_VA_SPACE_FILE, O_RDONLY);
+ if (fd < 0)
+ return -errno;
+ retval = read(fd, &c, 1);
+ close(fd);
+ if (retval < 0)
+ return -errno;
+ if (retval == 0)
+ return -EIO;
+ switch (c) {
+ case '0' : return 0;
+ case '1' : return 1;
+ case '2' : return 2;
+ default: return -EINVAL;
+ }
+}
+
+/*
+ * Try to mmap *size bytes in /dev/zero. If it is succesful, return the
+ * pointer to the mmap'd area and keep *size unmodified. Else, retry
+ * with a smaller zone: decrease *size by hugepage_sz until it reaches
+ * 0. In this case, return NULL. Note: this function returns an address
+ * which is a multiple of hugepage size.
+ */
+static void *
+get_virtual_area(uint64_t *size, uint64_t hugepage_sz)
+{
+ void *addr;
+ int fd;
+ long aligned_addr;
+
+ RTE_LOG(INFO, EAL, "Ask a virtual area of 0x%"PRIx64" bytes\n", *size);
+
+ fd = open("/dev/zero", O_RDONLY);
+ if (fd < 0){
+ RTE_LOG(ERR, EAL, "Cannot open /dev/zero\n");
+ return NULL;
+ }
+ do {
+ addr = mmap(NULL, (*size) + hugepage_sz, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (addr == MAP_FAILED)
+ *size -= hugepage_sz;
+ } while (addr == MAP_FAILED && *size > 0);
+
+ if (addr == MAP_FAILED) {
+ close(fd);
+ RTE_LOG(INFO, EAL, "Cannot get a virtual area\n");
+ return NULL;
+ }
+
+ munmap(addr, (*size) + hugepage_sz);
+ close(fd);
+
+ /* align addr to a huge page size boundary */
+ aligned_addr = (long)addr;
+ aligned_addr += (hugepage_sz - 1);
+ aligned_addr &= (~(hugepage_sz - 1));
+ addr = (void *)(aligned_addr);
+
+ RTE_LOG(INFO, EAL, "Virtual area found at %p (size = 0x%"PRIx64")\n",
+ addr, *size);
+
+ return addr;
+}
+
+/*
+ * Mmap all hugepages of hugepage table: it first open a file in
+ * hugetlbfs, then mmap() hugepage_sz data in it. If orig is set, the
+ * virtual address is stored in hugepg_tbl[i].orig_va, else it is stored
+ * in hugepg_tbl[i].final_va. The second mapping (when orig is 0) tries to
+ * map continguous physical blocks in contiguous virtual blocks.
+ */
+static int
+map_all_hugepages(struct hugepage *hugepg_tbl,
+ struct hugepage_info *hpi, int orig)
+{
+ int fd;
+ unsigned i;
+ void *virtaddr;
+ void *vma_addr = NULL;
+ uint64_t vma_len = 0;
+
+ for (i = 0; i < hpi->num_pages; i++) {
+ uint64_t hugepage_sz = hpi->hugepage_sz;
+
+ if (orig) {
+ hugepg_tbl[i].file_id = i;
+ hugepg_tbl[i].size = hugepage_sz;
+ eal_get_hugefile_path(hugepg_tbl[i].filepath,
+ sizeof(hugepg_tbl[i].filepath), hpi->hugedir,
+ hugepg_tbl[i].file_id);
+ hugepg_tbl[i].filepath[sizeof(hugepg_tbl[i].filepath) - 1] = '\0';
+ }
+#ifndef RTE_ARCH_X86_64
+ /* for 32-bit systems, don't remap 1G pages, just reuse original
+ * map address as final map address.
+ */
+ else if (hugepage_sz == RTE_PGSIZE_1G){
+ hugepg_tbl[i].final_va = hugepg_tbl[i].orig_va;
+ hugepg_tbl[i].orig_va = NULL;
+ continue;
+ }
+#endif
+ else if (vma_len == 0) {
+ unsigned j, num_pages;
+
+ /* reserve a virtual area for next contiguous
+ * physical block: count the number of
+ * contiguous physical pages. */
+ for (j = i+1; j < hpi->num_pages ; j++) {
+ if (hugepg_tbl[j].physaddr !=
+ hugepg_tbl[j-1].physaddr + hugepage_sz)
+ break;
+ }
+ num_pages = j - i;
+ vma_len = num_pages * hugepage_sz;
+
+ /* get the biggest virtual memory area up to
+ * vma_len. If it fails, vma_addr is NULL, so
+ * let the kernel provide the address. */
+ vma_addr = get_virtual_area(&vma_len, hpi->hugepage_sz);
+ if (vma_addr == NULL)
+ vma_len = hugepage_sz;
+ }
+
+ fd = open(hugepg_tbl[i].filepath, O_CREAT | O_RDWR, 0755);
+ if (fd < 0) {
+ RTE_LOG(ERR, EAL, "%s(): open failed: %s", __func__,
+ strerror(errno));
+ return -1;
+ }
+
+ virtaddr = mmap(vma_addr, hugepage_sz, PROT_READ | PROT_WRITE,
+ MAP_SHARED, fd, 0);
+ if (virtaddr == MAP_FAILED) {
+ RTE_LOG(ERR, EAL, "%s(): mmap failed: %s", __func__,
+ strerror(errno));
+ close(fd);
+ return -1;
+ }
+ if (orig) {
+ hugepg_tbl[i].orig_va = virtaddr;
+ memset(virtaddr, 0, hugepage_sz);
+ }
+ else {
+ hugepg_tbl[i].final_va = virtaddr;
+ }
+
+ vma_addr = (char *)vma_addr + hugepage_sz;
+ vma_len -= hugepage_sz;
+ close(fd);
+ }
+ return 0;
+}
+
+/* Unmap all hugepages from original mapping. */
+static int
+unmap_all_hugepages_orig(struct hugepage *hugepg_tbl, struct hugepage_info *hpi)
+{
+ unsigned i;
+ for (i = 0; i < hpi->num_pages; i++) {
+ if (hugepg_tbl[i].orig_va) {
+ munmap(hugepg_tbl[i].orig_va, hpi->hugepage_sz);
+ hugepg_tbl[i].orig_va = NULL;
+ }
+ }
+ return 0;
+}
+
+/*
+ * For each hugepage in hugepg_tbl, fill the physaddr value. We find
+ * it by browsing the /proc/self/pagemap special file.
+ */
+static int
+find_physaddr(struct hugepage *hugepg_tbl, struct hugepage_info *hpi)
+{
+ int fd;
+ unsigned i;
+ uint64_t page;
+ unsigned long virt_pfn;
+ int page_size;
+
+ /* standard page size */
+ page_size = getpagesize();
+
+ fd = open("/proc/self/pagemap", O_RDONLY);
+ if (fd < 0) {
+ RTE_LOG(ERR, EAL, "%s(): cannot open /proc/self/pagemap: %s",
+ __func__, strerror(errno));
+ return -1;
+ }
+
+ for (i = 0; i < hpi->num_pages; i++) {
+ off_t offset;
+ virt_pfn = (unsigned long)hugepg_tbl[i].orig_va /
+ page_size;
+ offset = sizeof(uint64_t) * virt_pfn;
+ if (lseek(fd, offset, SEEK_SET) != offset){
+ RTE_LOG(ERR, EAL, "%s(): seek error in /proc/self/pagemap: %s",
+ __func__, strerror(errno));
+ close(fd);
+ return -1;
+ }
+ if (read(fd, &page, sizeof(uint64_t)) < 0) {
+ RTE_LOG(ERR, EAL, "%s(): cannot read /proc/self/pagemap: %s",
+ __func__, strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ /*
+ * the pfn (page frame number) are bits 0-54 (see
+ * pagemap.txt in linux Documentation)
+ */
+ hugepg_tbl[i].physaddr = ((page & 0x7fffffffffffffULL) * page_size);
+ }
+ close(fd);
+ return 0;
+}
+
+/*
+ * Parse /proc/self/numa_maps to get the NUMA socket ID for each huge
+ * page.
+ */
+static int
+find_numasocket(struct hugepage *hugepg_tbl, struct hugepage_info *hpi)
+{
+ int socket_id;
+ char *end, *nodestr;
+ unsigned i, hp_count = 0;
+ uint64_t virt_addr;
+ char buf[BUFSIZ];
+ char hugedir_str[PATH_MAX];
+ FILE *f;
+
+ f = fopen("/proc/self/numa_maps", "r");
+ if (f == NULL) {
+ RTE_LOG(INFO, EAL, "cannot open /proc/self/numa_maps,"
+ "consider that all memory is in socket_id 0");
+ return 0;
+ }
+
+ rte_snprintf(hugedir_str, sizeof(hugedir_str),
+ "%s/", hpi->hugedir);
+
+ /* parse numa map */
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+
+ /* ignore non huge page */
+ if (strstr(buf, " huge ") == NULL &&
+ strstr(buf, hugedir_str) == NULL)
+ continue;
+
+ /* get zone addr */
+ virt_addr = strtoull(buf, &end, 16);
+ if (virt_addr == 0 || end == buf) {
+ RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
+ goto error;
+ }
+
+ /* get node id (socket id) */
+ nodestr = strstr(buf, " N");
+ if (nodestr == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
+ goto error;
+ }
+ nodestr += 2;
+ end = strstr(nodestr, "=");
+ if (end == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
+ goto error;
+ }
+ end[0] = '\0';
+ end = NULL;
+
+ socket_id = strtoul(nodestr, &end, 0);
+ if ((nodestr[0] == '\0') || (end == NULL) || (*end != '\0')) {
+ RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
+ goto error;
+ }
+
+ /* if we find this page in our mappings, set socket_id */
+ for (i = 0; i < hpi->num_pages; i++) {
+ void *va = (void *)(unsigned long)virt_addr;
+ if (hugepg_tbl[i].orig_va == va) {
+ hugepg_tbl[i].socket_id = socket_id;
+ hp_count++;
+ }
+ }
+ }
+ if (hp_count < hpi->num_pages)
+ goto error;
+ fclose(f);
+ return 0;
+
+error:
+ fclose(f);
+ return -1;
+}
+
+/*
+ * Sort the hugepg_tbl by physical address (lower addresses first). We
+ * use a slow algorithm, but we won't have millions of pages, and this
+ * is only done at init time.
+ */
+static int
+sort_by_physaddr(struct hugepage *hugepg_tbl, struct hugepage_info *hpi)
+{
+ unsigned i, j;
+ int smallest_idx;
+ uint64_t smallest_addr;
+ struct hugepage tmp;
+
+ for (i = 0; i < hpi->num_pages; i++) {
+ smallest_addr = 0;
+ smallest_idx = -1;
+
+ /*
+ * browse all entries starting at 'i', and find the
+ * entry with the smallest addr
+ */
+ for (j=i; j<hpi->num_pages; j++) {
+
+ if (smallest_addr == 0 ||
+ hugepg_tbl[j].physaddr < smallest_addr) {
+ smallest_addr = hugepg_tbl[j].physaddr;
+ smallest_idx = j;
+ }
+ }
+
+ /* should not happen */
+ if (smallest_idx == -1) {
+ RTE_LOG(ERR, EAL, "%s(): error in physaddr sorting\n", __func__);
+ return -1;
+ }
+
+ /* swap the 2 entries in the table */
+ memcpy(&tmp, &hugepg_tbl[smallest_idx], sizeof(struct hugepage));
+ memcpy(&hugepg_tbl[smallest_idx], &hugepg_tbl[i],
+ sizeof(struct hugepage));
+ memcpy(&hugepg_tbl[i], &tmp, sizeof(struct hugepage));
+ }
+ return 0;
+}
+
+/*
+ * Uses mmap to create a shared memory area for storage of data
+ *Used in this file to store the hugepage file map on disk
+ */
+static void *
+create_shared_memory(const char *filename, const size_t mem_size)
+{
+ void *retval;
+ int fd = open(filename, O_CREAT | O_RDWR, 0666);
+ if (fd < 0)
+ return NULL;
+ if (ftruncate(fd, mem_size) < 0) {
+ close(fd);
+ return NULL;
+ }
+ retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ close(fd);
+ return retval;
+}
+
+/*
+ * This function takes in the list of hugepage sizes and the
+ * number of pages thereof, and calculates the best number of
+ * pages of each size to fulfill the request for <memory> ram
+ */
+static int
+calc_num_pages(uint64_t memory,
+ struct hugepage_info *hp_info,
+ struct hugepage_info *hp_used,
+ unsigned num_hp_info)
+{
+ unsigned i = 0;
+ int total_num_pages = 0;
+ if (num_hp_info == 0)
+ return -1;
+
+ for (i = 0; i < num_hp_info; i++){
+ hp_used[i].hugepage_sz = hp_info[i].hugepage_sz;
+ hp_used[i].hugedir = hp_info[i].hugedir;
+ hp_used[i].num_pages = RTE_MIN(memory / hp_info[i].hugepage_sz,
+ hp_info[i].num_pages);
+
+ memory -= hp_used[i].num_pages * hp_used[i].hugepage_sz;
+ total_num_pages += hp_used[i].num_pages;
+
+ /* check if we have met all memory requests */
+ if (memory == 0)
+ break;
+ /* check if we have any more pages left at this size, if so
+ * move on to next size */
+ if (hp_used[i].num_pages == hp_info[i].num_pages)
+ continue;
+ /* At this point we know that there are more pages available that are
+ * bigger than the memory we want, so lets see if we can get enough
+ * from other page sizes.
+ */
+ unsigned j;
+ uint64_t remaining_mem = 0;
+ for (j = i+1; j < num_hp_info; j++)
+ remaining_mem += hp_info[j].hugepage_sz * hp_info[j].num_pages;
+
+ /* is there enough other memory, if not allocate another page and quit*/
+ if (remaining_mem < memory){
+ memory -= hp_info[i].hugepage_sz;
+ hp_used[i].num_pages++;
+ total_num_pages++;
+ break; /* we are done */
+ }
+ }
+ return total_num_pages;
+}
+
+/*
+ * Prepare physical memory mapping: fill configuration structure with
+ * these infos, return 0 on success.
+ * 1. map N huge pages in separate files in hugetlbfs
+ * 2. find associated physical addr
+ * 3. find associated NUMA socket ID
+ * 4. sort all huge pages by physical address
+ * 5. remap these N huge pages in the correct order
+ * 6. unmap the first mapping
+ * 7. fill memsegs in configuration with contiguous zones
+ */
+static int
+rte_eal_hugepage_init(void)
+{
+ struct rte_mem_config *mcfg;
+ struct hugepage *hugepage;
+ struct hugepage_info used_hp[MAX_HUGEPAGE_SIZES];
+ int i, j, new_memseg;
+ int nrpages;
+ void *addr;
+
+ memset(used_hp, 0, sizeof(used_hp));
+
+ /* get pointer to global configuration */
+ mcfg = rte_eal_get_configuration()->mem_config;
+
+ /* for debug purposes, hugetlbfs can be disabled */
+ if (internal_config.no_hugetlbfs) {
+ addr = malloc(internal_config.memory);
+ mcfg->memseg[0].phys_addr = (unsigned long)addr;
+ mcfg->memseg[0].addr = addr;
+ mcfg->memseg[0].len = internal_config.memory;
+ mcfg->memseg[0].socket_id = 0;
+ return 0;
+ }
+
+ nrpages = calc_num_pages(internal_config.memory,
+ &internal_config.hugepage_info[0], &used_hp[0],
+ internal_config.num_hugepage_sizes);
+ for (i = 0; i < (int)internal_config.num_hugepage_sizes; i++)
+ RTE_LOG(INFO, EAL, "Requesting %u pages of size %"PRIu64"\n",
+ used_hp[i].num_pages, used_hp[i].hugepage_sz);
+
+ hugepage = create_shared_memory(eal_hugepage_info_path(),
+ nrpages * sizeof(struct hugepage));
+ if (hugepage == NULL)
+ return -1;
+ memset(hugepage, 0, nrpages * sizeof(struct hugepage));
+
+ unsigned hp_offset = 0; /* where we start the current page size entries */
+ for (i = 0; i < (int)internal_config.num_hugepage_sizes; i ++){
+ struct hugepage_info *hpi = &used_hp[i];
+ if (hpi->num_pages == 0)
+ continue;
+
+ if (map_all_hugepages(&hugepage[hp_offset], hpi, 1) < 0){
+ RTE_LOG(DEBUG, EAL, "Failed to mmap %u MB hugepages\n",
+ (unsigned)(hpi->hugepage_sz / 0x100000));
+ goto fail;
+ }
+
+ if (find_physaddr(&hugepage[hp_offset], hpi) < 0){
+ RTE_LOG(DEBUG, EAL, "Failed to find phys addr for %u MB pages\n",
+ (unsigned)(hpi->hugepage_sz / 0x100000));
+ goto fail;
+ }
+
+ if (find_numasocket(&hugepage[hp_offset], hpi) < 0){
+ RTE_LOG(DEBUG, EAL, "Failed to find NUMA socket for %u MB pages\n",
+ (unsigned)(hpi->hugepage_sz / 0x100000));
+ goto fail;
+ }
+
+ if (sort_by_physaddr(&hugepage[hp_offset], hpi) < 0)
+ goto fail;
+
+ if (map_all_hugepages(&hugepage[hp_offset], hpi, 0) < 0){
+ RTE_LOG(DEBUG, EAL, "Failed to remap %u MB pages\n",
+ (unsigned)(hpi->hugepage_sz / 0x100000));
+ goto fail;
+ }
+
+ if (unmap_all_hugepages_orig(&hugepage[hp_offset], hpi) < 0)
+ goto fail;
+
+ /* we have processed a num of hugepages of this size, so inc offset */
+ hp_offset += hpi->num_pages;
+ }
+
+ memset(mcfg->memseg, 0, sizeof(mcfg->memseg));
+ j = -1;
+ for (i = 0; i < nrpages; i++) {
+ new_memseg = 0;
+
+ /* if this is a new section, create a new memseg */
+ if (i == 0)
+ new_memseg = 1;
+ else if (hugepage[i].socket_id != hugepage[i-1].socket_id)
+ new_memseg = 1;
+ else if (hugepage[i].size != hugepage[i-1].size)
+ new_memseg = 1;
+ else if ((hugepage[i].physaddr - hugepage[i-1].physaddr) !=
+ hugepage[i].size)
+ new_memseg = 1;
+ else if (((unsigned long)hugepage[i].final_va -
+ (unsigned long)hugepage[i-1].final_va) != hugepage[i].size)
+ new_memseg = 1;
+
+ if (new_memseg) {
+ j += 1;
+ if (j == RTE_MAX_MEMSEG)
+ break;
+
+ mcfg->memseg[j].phys_addr = hugepage[i].physaddr;
+ mcfg->memseg[j].addr = hugepage[i].final_va;
+ mcfg->memseg[j].len = hugepage[i].size;
+ mcfg->memseg[j].socket_id = hugepage[i].socket_id;
+ mcfg->memseg[j].hugepage_sz = hugepage[i].size;
+ }
+ /* continuation of previous memseg */
+ else {
+ mcfg->memseg[j].len += mcfg->memseg[j].hugepage_sz;
+ }
+ hugepage[i].memseg_id = j;
+ }
+
+ return 0;
+
+
+ fail:
+ return -1;
+}
+
+/*
+ * uses fstat to report the size of a file on disk
+ */
+static off_t
+getFileSize(int fd)
+{
+ struct stat st;
+ if (fstat(fd, &st) < 0)
+ return 0;
+ return st.st_size;
+}
+
+/*
+ * This creates the memory mappings in the secondary process to match that of
+ * the server process. It goes through each memory segment in the DPDK runtime
+ * configuration and finds the hugepages which form that segment, mapping them
+ * in order to form a contiguous block in the virtual memory space
+ */
+static int
+rte_eal_hugepage_attach(void)
+{
+ const struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
+ const struct hugepage *hp = NULL;
+ unsigned num_hp = 0;
+ unsigned i, s = 0; /* s used to track the segment number */
+ off_t size;
+ int fd, fd_zero = -1, fd_hugepage = -1;
+
+ if (aslr_enabled() > 0) {
+ RTE_LOG(WARNING, EAL, "WARNING: Address Space Layout Randomization "
+ "(ASLR) is enabled in the kernel.\n");
+ RTE_LOG(WARNING, EAL, " This may cause issues with mapping memory "
+ "into secondary processes\n");
+ }
+
+ fd_zero = open("/dev/zero", O_RDONLY);
+ if (fd_zero < 0) {
+ RTE_LOG(ERR, EAL, "Could not open /dev/zero\n");
+ goto error;
+ }
+ fd_hugepage = open(eal_hugepage_info_path(), O_RDONLY);
+ if (fd_hugepage < 0) {
+ RTE_LOG(ERR, EAL, "Could not open %s\n", eal_hugepage_info_path());
+ goto error;
+ }
+
+ size = getFileSize(fd_hugepage);
+ hp = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd_hugepage, 0);
+ if (hp == NULL) {
+ RTE_LOG(ERR, EAL, "Could not mmap %s\n", eal_hugepage_info_path());
+ goto error;
+ }
+
+ num_hp = size / sizeof(struct hugepage);
+ RTE_LOG(DEBUG, EAL, "Analysing %u hugepages\n", num_hp);
+
+ while (s < RTE_MAX_MEMSEG && mcfg->memseg[s].len > 0){
+ void *addr, *base_addr;
+ uintptr_t offset = 0;
+
+ /* fdzero is mmapped to get a contiguous block of virtual addresses
+ * get a block of free memory of the appropriate size -
+ * use mmap to attempt to get an identical address as server.
+ */
+ base_addr = mmap(mcfg->memseg[s].addr, mcfg->memseg[s].len,
+ PROT_READ, MAP_PRIVATE, fd_zero, 0);
+ if (base_addr == MAP_FAILED || base_addr != mcfg->memseg[s].addr) {
+ RTE_LOG(ERR, EAL, "Could not mmap %llu bytes "
+ "in /dev/zero to requested address [%p]\n",
+ (unsigned long long)mcfg->memseg[s].len,
+ mcfg->memseg[s].addr);
+ if (aslr_enabled() > 0)
+ RTE_LOG(ERR, EAL, "It is recommended to disable ASLR in the kernel "
+ "and retry running both primary and secondary processes\n");
+ goto error;
+ }
+ /* free memory so we can map the hugepages into the space */
+ munmap(base_addr, mcfg->memseg[s].len);
+
+ /* find the hugepages for this segment and map them
+ * we don't need to worry about order, as the server sorted the
+ * entries before it did the second mmap of them */
+ for (i = 0; i < num_hp && offset < mcfg->memseg[s].len; i++){
+ if (hp[i].memseg_id == (int)s){
+ fd = open(hp[i].filepath, O_RDWR);
+ if (fd < 0) {
+ RTE_LOG(ERR, EAL, "Could not open %s\n",
+ hp[i].filepath);
+ goto error;
+ }
+ addr = mmap(RTE_PTR_ADD(base_addr, offset),
+ hp[i].size, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_FIXED, fd, 0);
+ close(fd); /* close file both on success and on failure */
+ if (addr == MAP_FAILED) {
+ RTE_LOG(ERR, EAL, "Could not mmap %s\n",
+ hp[i].filepath);
+ goto error;
+ }
+ offset+=hp[i].size;
+ }
+ }
+ RTE_LOG(DEBUG, EAL, "Mapped segment %u of size 0x%llx\n", s,
+ (unsigned long long)mcfg->memseg[s].len);
+ s++;
+ }
+ close(fd_zero);
+ close(fd_hugepage);
+ return 0;
+
+error:
+ if (fd_zero >= 0)
+ close(fd_zero);
+ if (fd_hugepage >= 0)
+ close(fd_hugepage);
+ return -1;
+}
+
+static int
+rte_eal_memdevice_init(void)
+{
+ struct rte_config *config;
+
+ if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+ return 0;
+
+ config = rte_eal_get_configuration();
+ config->mem_config->nchannel = internal_config.force_nchannel;
+ config->mem_config->nrank = internal_config.force_nrank;
+
+ return 0;
+}
+
+
+/* init memory subsystem */
+int
+rte_eal_memory_init(void)
+{
+ const int retval = rte_eal_process_type() == RTE_PROC_PRIMARY ?
+ rte_eal_hugepage_init() :
+ rte_eal_hugepage_attach();
+ if (retval < 0)
+ return -1;
+
+ if (internal_config.no_shconf == 0 && rte_eal_memdevice_init() < 0)
+ return -1;
+
+ return 0;
+}