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f-stack/dpdk/lib/eal/linux/eal_memory.c

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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation.
* Copyright(c) 2013 6WIND S.A.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/file.h>
#include <sys/resource.h>
#include <unistd.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <signal.h>
#include <setjmp.h>
#ifdef F_ADD_SEALS /* if file sealing is supported, so is memfd */
#include <linux/memfd.h>
#define MEMFD_SUPPORTED
#endif
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
#include <numa.h>
#include <numaif.h>
#endif
#include <rte_errno.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_launch.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_memalloc.h"
#include "eal_memcfg.h"
#include "eal_internal_cfg.h"
#include "eal_filesystem.h"
#include "eal_hugepages.h"
#include "eal_options.h"
#define PFN_MASK_SIZE 8
/**
* @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.
*/
static int phys_addrs_available = -1;
#define RANDOMIZE_VA_SPACE_FILE "/proc/sys/kernel/randomize_va_space"
uint64_t eal_get_baseaddr(void)
{
/*
* Linux kernel uses a really high address as starting address for
* serving mmaps calls. If there exists addressing limitations and IOVA
* mode is VA, this starting address is likely too high for those
* devices. However, it is possible to use a lower address in the
* process virtual address space as with 64 bits there is a lot of
* available space.
*
* Current known limitations are 39 or 40 bits. Setting the starting
* address at 4GB implies there are 508GB or 1020GB for mapping the
* available hugepages. This is likely enough for most systems, although
* a device with addressing limitations should call
* rte_mem_check_dma_mask for ensuring all memory is within supported
* range.
*/
return 0x100000000ULL;
}
/*
* Get physical address of any mapped virtual address in the current process.
*/
phys_addr_t
rte_mem_virt2phy(const void *virtaddr)
{
int fd, retval;
uint64_t page, physaddr;
unsigned long virt_pfn;
int page_size;
off_t offset;
if (phys_addrs_available == 0)
return RTE_BAD_IOVA;
/* standard page size */
page_size = getpagesize();
fd = open("/proc/self/pagemap", O_RDONLY);
if (fd < 0) {
RTE_LOG(INFO, EAL, "%s(): cannot open /proc/self/pagemap: %s\n",
__func__, strerror(errno));
return RTE_BAD_IOVA;
}
virt_pfn = (unsigned long)virtaddr / page_size;
offset = sizeof(uint64_t) * virt_pfn;
if (lseek(fd, offset, SEEK_SET) == (off_t) -1) {
RTE_LOG(INFO, EAL, "%s(): seek error in /proc/self/pagemap: %s\n",
__func__, strerror(errno));
close(fd);
return RTE_BAD_IOVA;
}
retval = read(fd, &page, PFN_MASK_SIZE);
close(fd);
if (retval < 0) {
RTE_LOG(INFO, EAL, "%s(): cannot read /proc/self/pagemap: %s\n",
__func__, strerror(errno));
return RTE_BAD_IOVA;
} else if (retval != PFN_MASK_SIZE) {
RTE_LOG(INFO, EAL, "%s(): read %d bytes from /proc/self/pagemap "
"but expected %d:\n",
__func__, retval, PFN_MASK_SIZE);
return RTE_BAD_IOVA;
}
/*
* the pfn (page frame number) are bits 0-54 (see
* pagemap.txt in linux Documentation)
*/
if ((page & 0x7fffffffffffffULL) == 0)
return RTE_BAD_IOVA;
physaddr = ((page & 0x7fffffffffffffULL) * page_size)
+ ((unsigned long)virtaddr % page_size);
return physaddr;
}
rte_iova_t
rte_mem_virt2iova(const void *virtaddr)
{
if (rte_eal_iova_mode() == RTE_IOVA_VA)
return (uintptr_t)virtaddr;
return rte_mem_virt2phy(virtaddr);
}
/*
* For each hugepage in hugepg_tbl, fill the physaddr value. We find
* it by browsing the /proc/self/pagemap special file.
*/
static int
find_physaddrs(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
{
unsigned int i;
phys_addr_t addr;
for (i = 0; i < hpi->num_pages[0]; i++) {
addr = rte_mem_virt2phy(hugepg_tbl[i].orig_va);
if (addr == RTE_BAD_PHYS_ADDR)
return -1;
hugepg_tbl[i].physaddr = addr;
}
return 0;
}
/*
* For each hugepage in hugepg_tbl, fill the physaddr value sequentially.
*/
static int
set_physaddrs(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
{
unsigned int i;
static phys_addr_t addr;
for (i = 0; i < hpi->num_pages[0]; i++) {
hugepg_tbl[i].physaddr = addr;
addr += hugepg_tbl[i].size;
}
return 0;
}
/*
* 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;
}
}
static sigjmp_buf huge_jmpenv;
static void huge_sigbus_handler(int signo __rte_unused)
{
siglongjmp(huge_jmpenv, 1);
}
/* Put setjmp into a wrap method to avoid compiling error. Any non-volatile,
* non-static local variable in the stack frame calling sigsetjmp might be
* clobbered by a call to longjmp.
*/
static int huge_wrap_sigsetjmp(void)
{
return sigsetjmp(huge_jmpenv, 1);
}
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
/* Callback for numa library. */
void numa_error(char *where)
{
RTE_LOG(ERR, EAL, "%s failed: %s\n", where, strerror(errno));
}
#endif
/*
* 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 contiguous physical blocks in contiguous virtual blocks.
*/
static unsigned
map_all_hugepages(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi,
uint64_t *essential_memory __rte_unused)
{
int fd;
unsigned i;
void *virtaddr;
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
int node_id = -1;
int essential_prev = 0;
int oldpolicy;
struct bitmask *oldmask = NULL;
bool have_numa = true;
unsigned long maxnode = 0;
const struct internal_config *internal_conf =
eal_get_internal_configuration();
/* Check if kernel supports NUMA. */
if (numa_available() != 0) {
RTE_LOG(DEBUG, EAL, "NUMA is not supported.\n");
have_numa = false;
}
if (have_numa) {
RTE_LOG(DEBUG, EAL, "Trying to obtain current memory policy.\n");
oldmask = numa_allocate_nodemask();
if (get_mempolicy(&oldpolicy, oldmask->maskp,
oldmask->size + 1, 0, 0) < 0) {
RTE_LOG(ERR, EAL,
"Failed to get current mempolicy: %s. "
"Assuming MPOL_DEFAULT.\n", strerror(errno));
oldpolicy = MPOL_DEFAULT;
}
for (i = 0; i < RTE_MAX_NUMA_NODES; i++)
if (internal_conf->socket_mem[i])
maxnode = i + 1;
}
#endif
for (i = 0; i < hpi->num_pages[0]; i++) {
struct hugepage_file *hf = &hugepg_tbl[i];
uint64_t hugepage_sz = hpi->hugepage_sz;
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
if (maxnode) {
unsigned int j;
for (j = 0; j < maxnode; j++)
if (essential_memory[j])
break;
if (j == maxnode) {
node_id = (node_id + 1) % maxnode;
while (!internal_conf->socket_mem[node_id]) {
node_id++;
node_id %= maxnode;
}
essential_prev = 0;
} else {
node_id = j;
essential_prev = essential_memory[j];
if (essential_memory[j] < hugepage_sz)
essential_memory[j] = 0;
else
essential_memory[j] -= hugepage_sz;
}
RTE_LOG(DEBUG, EAL,
"Setting policy MPOL_PREFERRED for socket %d\n",
node_id);
numa_set_preferred(node_id);
}
#endif
hf->file_id = i;
hf->size = hugepage_sz;
eal_get_hugefile_path(hf->filepath, sizeof(hf->filepath),
hpi->hugedir, hf->file_id);
hf->filepath[sizeof(hf->filepath) - 1] = '\0';
/* try to create hugepage file */
fd = open(hf->filepath, O_CREAT | O_RDWR, 0600);
if (fd < 0) {
RTE_LOG(DEBUG, EAL, "%s(): open failed: %s\n", __func__,
strerror(errno));
goto out;
}
/* map the segment, and populate page tables,
* the kernel fills this segment with zeros. we don't care where
* this gets mapped - we already have contiguous memory areas
* ready for us to map into.
*/
virtaddr = mmap(NULL, hugepage_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, 0);
if (virtaddr == MAP_FAILED) {
RTE_LOG(DEBUG, EAL, "%s(): mmap failed: %s\n", __func__,
strerror(errno));
close(fd);
goto out;
}
hf->orig_va = virtaddr;
/* In linux, hugetlb limitations, like cgroup, are
* enforced at fault time instead of mmap(), even
* with the option of MAP_POPULATE. Kernel will send
* a SIGBUS signal. To avoid to be killed, save stack
* environment here, if SIGBUS happens, we can jump
* back here.
*/
if (huge_wrap_sigsetjmp()) {
RTE_LOG(DEBUG, EAL, "SIGBUS: Cannot mmap more "
"hugepages of size %u MB\n",
(unsigned int)(hugepage_sz / 0x100000));
munmap(virtaddr, hugepage_sz);
close(fd);
unlink(hugepg_tbl[i].filepath);
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
if (maxnode)
essential_memory[node_id] =
essential_prev;
#endif
goto out;
}
*(int *)virtaddr = 0;
/* set shared lock on the file. */
if (flock(fd, LOCK_SH) < 0) {
RTE_LOG(DEBUG, EAL, "%s(): Locking file failed:%s \n",
__func__, strerror(errno));
close(fd);
goto out;
}
close(fd);
}
out:
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
if (maxnode) {
RTE_LOG(DEBUG, EAL,
"Restoring previous memory policy: %d\n", oldpolicy);
if (oldpolicy == MPOL_DEFAULT) {
numa_set_localalloc();
} else if (set_mempolicy(oldpolicy, oldmask->maskp,
oldmask->size + 1) < 0) {
RTE_LOG(ERR, EAL, "Failed to restore mempolicy: %s\n",
strerror(errno));
numa_set_localalloc();
}
}
if (oldmask != NULL)
numa_free_cpumask(oldmask);
#endif
return i;
}
/*
* Parse /proc/self/numa_maps to get the NUMA socket ID for each huge
* page.
*/
static int
find_numasocket(struct hugepage_file *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(NOTICE, EAL, "NUMA support not available"
" consider that all memory is in socket_id 0\n");
return 0;
}
snprintf(hugedir_str, sizeof(hugedir_str),
"%s/%s", hpi->hugedir, eal_get_hugefile_prefix());
/* 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[0]; i++) {
void *va = (void *)(unsigned long)virt_addr;
if (hugepg_tbl[i].orig_va == va) {
hugepg_tbl[i].socket_id = socket_id;
hp_count++;
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
RTE_LOG(DEBUG, EAL,
"Hugepage %s is on socket %d\n",
hugepg_tbl[i].filepath, socket_id);
#endif
}
}
}
if (hp_count < hpi->num_pages[0])
goto error;
fclose(f);
return 0;
error:
fclose(f);
return -1;
}
static int
cmp_physaddr(const void *a, const void *b)
{
#ifndef RTE_ARCH_PPC_64
const struct hugepage_file *p1 = a;
const struct hugepage_file *p2 = b;
#else
/* PowerPC needs memory sorted in reverse order from x86 */
const struct hugepage_file *p1 = b;
const struct hugepage_file *p2 = a;
#endif
if (p1->physaddr < p2->physaddr)
return -1;
else if (p1->physaddr > p2->physaddr)
return 1;
else
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;
const struct internal_config *internal_conf =
eal_get_internal_configuration();
/* if no shared files mode is used, create anonymous memory instead */
if (internal_conf->no_shconf) {
retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (retval == MAP_FAILED)
return NULL;
return retval;
}
fd = open(filename, O_CREAT | O_RDWR, 0600);
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);
if (retval == MAP_FAILED)
return NULL;
return retval;
}
/*
* this copies *active* hugepages from one hugepage table to another.
* destination is typically the shared memory.
*/
static int
copy_hugepages_to_shared_mem(struct hugepage_file * dst, int dest_size,
const struct hugepage_file * src, int src_size)
{
int src_pos, dst_pos = 0;
for (src_pos = 0; src_pos < src_size; src_pos++) {
if (src[src_pos].orig_va != NULL) {
/* error on overflow attempt */
if (dst_pos == dest_size)
return -1;
memcpy(&dst[dst_pos], &src[src_pos], sizeof(struct hugepage_file));
dst_pos++;
}
}
return 0;
}
static int
unlink_hugepage_files(struct hugepage_file *hugepg_tbl,
unsigned num_hp_info)
{
unsigned socket, size;
int page, nrpages = 0;
const struct internal_config *internal_conf =
eal_get_internal_configuration();
/* get total number of hugepages */
for (size = 0; size < num_hp_info; size++)
for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++)
nrpages +=
internal_conf->hugepage_info[size].num_pages[socket];
for (page = 0; page < nrpages; page++) {
struct hugepage_file *hp = &hugepg_tbl[page];
if (hp->orig_va != NULL && unlink(hp->filepath)) {
RTE_LOG(WARNING, EAL, "%s(): Removing %s failed: %s\n",
__func__, hp->filepath, strerror(errno));
}
}
return 0;
}
/*
* unmaps hugepages that are not going to be used. since we originally allocate
* ALL hugepages (not just those we need), additional unmapping needs to be done.
*/
static int
unmap_unneeded_hugepages(struct hugepage_file *hugepg_tbl,
struct hugepage_info *hpi,
unsigned num_hp_info)
{
unsigned socket, size;
int page, nrpages = 0;
const struct internal_config *internal_conf =
eal_get_internal_configuration();
/* get total number of hugepages */
for (size = 0; size < num_hp_info; size++)
for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++)
nrpages += internal_conf->hugepage_info[size].num_pages[socket];
for (size = 0; size < num_hp_info; size++) {
for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) {
unsigned pages_found = 0;
/* traverse until we have unmapped all the unused pages */
for (page = 0; page < nrpages; page++) {
struct hugepage_file *hp = &hugepg_tbl[page];
/* find a page that matches the criteria */
if ((hp->size == hpi[size].hugepage_sz) &&
(hp->socket_id == (int) socket)) {
/* if we skipped enough pages, unmap the rest */
if (pages_found == hpi[size].num_pages[socket]) {
uint64_t unmap_len;
unmap_len = hp->size;
/* get start addr and len of the remaining segment */
munmap(hp->orig_va,
(size_t)unmap_len);
hp->orig_va = NULL;
if (unlink(hp->filepath) == -1) {
RTE_LOG(ERR, EAL, "%s(): Removing %s failed: %s\n",
__func__, hp->filepath, strerror(errno));
return -1;
}
} else {
/* lock the page and skip */
pages_found++;
}
} /* match page */
} /* foreach page */
} /* foreach socket */
} /* foreach pagesize */
return 0;
}
static int
remap_segment(struct hugepage_file *hugepages, int seg_start, int seg_end)
{
struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
struct rte_memseg_list *msl;
struct rte_fbarray *arr;
int cur_page, seg_len;
unsigned int msl_idx;
int ms_idx;
uint64_t page_sz;
size_t memseg_len;
int socket_id;
#ifndef RTE_ARCH_64
const struct internal_config *internal_conf =
eal_get_internal_configuration();
#endif
page_sz = hugepages[seg_start].size;
socket_id = hugepages[seg_start].socket_id;
seg_len = seg_end - seg_start;
RTE_LOG(DEBUG, EAL, "Attempting to map %" PRIu64 "M on socket %i\n",
(seg_len * page_sz) >> 20ULL, socket_id);
/* find free space in memseg lists */
for (msl_idx = 0; msl_idx < RTE_MAX_MEMSEG_LISTS; msl_idx++) {
bool empty;
msl = &mcfg->memsegs[msl_idx];
arr = &msl->memseg_arr;
if (msl->page_sz != page_sz)
continue;
if (msl->socket_id != socket_id)
continue;
/* leave space for a hole if array is not empty */
empty = arr->count == 0;
ms_idx = rte_fbarray_find_next_n_free(arr, 0,
seg_len + (empty ? 0 : 1));
/* memseg list is full? */
if (ms_idx < 0)
continue;
/* leave some space between memsegs, they are not IOVA
* contiguous, so they shouldn't be VA contiguous either.
*/
if (!empty)
ms_idx++;
break;
}
if (msl_idx == RTE_MAX_MEMSEG_LISTS) {
RTE_LOG(ERR, EAL, "Could not find space for memseg. Please increase %s and/or %s in configuration.\n",
RTE_STR(RTE_MAX_MEMSEG_PER_TYPE),
RTE_STR(RTE_MAX_MEM_MB_PER_TYPE));
return -1;
}
#ifdef RTE_ARCH_PPC_64
/* for PPC64 we go through the list backwards */
for (cur_page = seg_end - 1; cur_page >= seg_start;
cur_page--, ms_idx++) {
#else
for (cur_page = seg_start; cur_page < seg_end; cur_page++, ms_idx++) {
#endif
struct hugepage_file *hfile = &hugepages[cur_page];
struct rte_memseg *ms = rte_fbarray_get(arr, ms_idx);
void *addr;
int fd;
fd = open(hfile->filepath, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "Could not open '%s': %s\n",
hfile->filepath, strerror(errno));
return -1;
}
/* set shared lock on the file. */
if (flock(fd, LOCK_SH) < 0) {
RTE_LOG(DEBUG, EAL, "Could not lock '%s': %s\n",
hfile->filepath, strerror(errno));
close(fd);
return -1;
}
memseg_len = (size_t)page_sz;
addr = RTE_PTR_ADD(msl->base_va, ms_idx * memseg_len);
/* we know this address is already mmapped by memseg list, so
* using MAP_FIXED here is safe
*/
addr = mmap(addr, page_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd, 0);
if (addr == MAP_FAILED) {
RTE_LOG(ERR, EAL, "Couldn't remap '%s': %s\n",
hfile->filepath, strerror(errno));
close(fd);
return -1;
}
/* we have a new address, so unmap previous one */
#ifndef RTE_ARCH_64
/* in 32-bit legacy mode, we have already unmapped the page */
if (!internal_conf->legacy_mem)
munmap(hfile->orig_va, page_sz);
#else
munmap(hfile->orig_va, page_sz);
#endif
hfile->orig_va = NULL;
hfile->final_va = addr;
/* rewrite physical addresses in IOVA as VA mode */
if (rte_eal_iova_mode() == RTE_IOVA_VA)
hfile->physaddr = (uintptr_t)addr;
/* set up memseg data */
ms->addr = addr;
ms->hugepage_sz = page_sz;
ms->len = memseg_len;
ms->iova = hfile->physaddr;
ms->socket_id = hfile->socket_id;
ms->nchannel = rte_memory_get_nchannel();
ms->nrank = rte_memory_get_nrank();
rte_fbarray_set_used(arr, ms_idx);
/* store segment fd internally */
if (eal_memalloc_set_seg_fd(msl_idx, ms_idx, fd) < 0)
RTE_LOG(ERR, EAL, "Could not store segment fd: %s\n",
rte_strerror(rte_errno));
}
RTE_LOG(DEBUG, EAL, "Allocated %" PRIu64 "M on socket %i\n",
(seg_len * page_sz) >> 20, socket_id);
return 0;
}
static uint64_t
get_mem_amount(uint64_t page_sz, uint64_t max_mem)
{
uint64_t area_sz, max_pages;
/* limit to RTE_MAX_MEMSEG_PER_LIST pages or RTE_MAX_MEM_MB_PER_LIST */
max_pages = RTE_MAX_MEMSEG_PER_LIST;
max_mem = RTE_MIN((uint64_t)RTE_MAX_MEM_MB_PER_LIST << 20, max_mem);
area_sz = RTE_MIN(page_sz * max_pages, max_mem);
/* make sure the list isn't smaller than the page size */
area_sz = RTE_MAX(area_sz, page_sz);
return RTE_ALIGN(area_sz, page_sz);
}
static int
memseg_list_free(struct rte_memseg_list *msl)
{
if (rte_fbarray_destroy(&msl->memseg_arr)) {
RTE_LOG(ERR, EAL, "Cannot destroy memseg list\n");
return -1;
}
memset(msl, 0, sizeof(*msl));
return 0;
}
/*
* Our VA space is not preallocated yet, so preallocate it here. We need to know
* how many segments there are in order to map all pages into one address space,
* and leave appropriate holes between segments so that rte_malloc does not
* concatenate them into one big segment.
*
* we also need to unmap original pages to free up address space.
*/
static int __rte_unused
prealloc_segments(struct hugepage_file *hugepages, int n_pages)
{
struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
int cur_page, seg_start_page, end_seg, new_memseg;
unsigned int hpi_idx, socket, i;
int n_contig_segs, n_segs;
int msl_idx;
const struct internal_config *internal_conf =
eal_get_internal_configuration();
/* before we preallocate segments, we need to free up our VA space.
* we're not removing files, and we already have information about
* PA-contiguousness, so it is safe to unmap everything.
*/
for (cur_page = 0; cur_page < n_pages; cur_page++) {
struct hugepage_file *hpi = &hugepages[cur_page];
munmap(hpi->orig_va, hpi->size);
hpi->orig_va = NULL;
}
/* we cannot know how many page sizes and sockets we have discovered, so
* loop over all of them
*/
for (hpi_idx = 0; hpi_idx < internal_conf->num_hugepage_sizes;
hpi_idx++) {
uint64_t page_sz =
internal_conf->hugepage_info[hpi_idx].hugepage_sz;
for (i = 0; i < rte_socket_count(); i++) {
struct rte_memseg_list *msl;
socket = rte_socket_id_by_idx(i);
n_contig_segs = 0;
n_segs = 0;
seg_start_page = -1;
for (cur_page = 0; cur_page < n_pages; cur_page++) {
struct hugepage_file *prev, *cur;
int prev_seg_start_page = -1;
cur = &hugepages[cur_page];
prev = cur_page == 0 ? NULL :
&hugepages[cur_page - 1];
new_memseg = 0;
end_seg = 0;
if (cur->size == 0)
end_seg = 1;
else if (cur->socket_id != (int) socket)
end_seg = 1;
else if (cur->size != page_sz)
end_seg = 1;
else if (cur_page == 0)
new_memseg = 1;
#ifdef RTE_ARCH_PPC_64
/* On PPC64 architecture, the mmap always start
* from higher address to lower address. Here,
* physical addresses are in descending order.
*/
else if ((prev->physaddr - cur->physaddr) !=
cur->size)
new_memseg = 1;
#else
else if ((cur->physaddr - prev->physaddr) !=
cur->size)
new_memseg = 1;
#endif
if (new_memseg) {
/* if we're already inside a segment,
* new segment means end of current one
*/
if (seg_start_page != -1) {
end_seg = 1;
prev_seg_start_page =
seg_start_page;
}
seg_start_page = cur_page;
}
if (end_seg) {
if (prev_seg_start_page != -1) {
/* we've found a new segment */
n_contig_segs++;
n_segs += cur_page -
prev_seg_start_page;
} else if (seg_start_page != -1) {
/* we didn't find new segment,
* but did end current one
*/
n_contig_segs++;
n_segs += cur_page -
seg_start_page;
seg_start_page = -1;
continue;
} else {
/* we're skipping this page */
continue;
}
}
/* segment continues */
}
/* check if we missed last segment */
if (seg_start_page != -1) {
n_contig_segs++;
n_segs += cur_page - seg_start_page;
}
/* if no segments were found, do not preallocate */
if (n_segs == 0)
continue;
/* we now have total number of pages that we will
* allocate for this segment list. add separator pages
* to the total count, and preallocate VA space.
*/
n_segs += n_contig_segs - 1;
/* now, preallocate VA space for these segments */
/* first, find suitable memseg list for this */
for (msl_idx = 0; msl_idx < RTE_MAX_MEMSEG_LISTS;
msl_idx++) {
msl = &mcfg->memsegs[msl_idx];
if (msl->base_va != NULL)
continue;
break;
}
if (msl_idx == RTE_MAX_MEMSEG_LISTS) {
RTE_LOG(ERR, EAL, "Not enough space in memseg lists, please increase %s\n",
RTE_STR(RTE_MAX_MEMSEG_LISTS));
return -1;
}
/* now, allocate fbarray itself */
if (eal_memseg_list_init(msl, page_sz, n_segs,
socket, msl_idx, true) < 0)
return -1;
/* finally, allocate VA space */
if (eal_memseg_list_alloc(msl, 0) < 0) {
RTE_LOG(ERR, EAL, "Cannot preallocate 0x%"PRIx64"kB hugepages\n",
page_sz >> 10);
return -1;
}
}
}
return 0;
}
/*
* We cannot reallocate memseg lists on the fly because PPC64 stores pages
* backwards, therefore we have to process the entire memseg first before
* remapping it into memseg list VA space.
*/
static int
remap_needed_hugepages(struct hugepage_file *hugepages, int n_pages)
{
int cur_page, seg_start_page, new_memseg, ret;
seg_start_page = 0;
for (cur_page = 0; cur_page < n_pages; cur_page++) {
struct hugepage_file *prev, *cur;
new_memseg = 0;
cur = &hugepages[cur_page];
prev = cur_page == 0 ? NULL : &hugepages[cur_page - 1];
/* if size is zero, no more pages left */
if (cur->size == 0)
break;
if (cur_page == 0)
new_memseg = 1;
else if (cur->socket_id != prev->socket_id)
new_memseg = 1;
else if (cur->size != prev->size)
new_memseg = 1;
#ifdef RTE_ARCH_PPC_64
/* On PPC64 architecture, the mmap always start from higher
* address to lower address. Here, physical addresses are in
* descending order.
*/
else if ((prev->physaddr - cur->physaddr) != cur->size)
new_memseg = 1;
#else
else if ((cur->physaddr - prev->physaddr) != cur->size)
new_memseg = 1;
#endif
if (new_memseg) {
/* if this isn't the first time, remap segment */
if (cur_page != 0) {
ret = remap_segment(hugepages, seg_start_page,
cur_page);
if (ret != 0)
return -1;
}
/* remember where we started */
seg_start_page = cur_page;
}
/* continuation of previous memseg */
}
/* we were stopped, but we didn't remap the last segment, do it now */
if (cur_page != 0) {
ret = remap_segment(hugepages, seg_start_page,
cur_page);
if (ret != 0)
return -1;
}
return 0;
}
static inline size_t
eal_get_hugepage_mem_size(void)
{
uint64_t size = 0;
unsigned i, j;
struct internal_config *internal_conf =
eal_get_internal_configuration();
for (i = 0; i < internal_conf->num_hugepage_sizes; i++) {
struct hugepage_info *hpi = &internal_conf->hugepage_info[i];
if (strnlen(hpi->hugedir, sizeof(hpi->hugedir)) != 0) {
for (j = 0; j < RTE_MAX_NUMA_NODES; j++) {
size += hpi->hugepage_sz * hpi->num_pages[j];
}
}
}
return (size < SIZE_MAX) ? (size_t)(size) : SIZE_MAX;
}
static struct sigaction huge_action_old;
static int huge_need_recover;
static void
huge_register_sigbus(void)
{
sigset_t mask;
struct sigaction action;
sigemptyset(&mask);
sigaddset(&mask, SIGBUS);
action.sa_flags = 0;
action.sa_mask = mask;
action.sa_handler = huge_sigbus_handler;
huge_need_recover = !sigaction(SIGBUS, &action, &huge_action_old);
}
static void
huge_recover_sigbus(void)
{
if (huge_need_recover) {
sigaction(SIGBUS, &huge_action_old, NULL);
huge_need_recover = 0;
}
}
/*
* 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
eal_legacy_hugepage_init(void)
{
struct rte_mem_config *mcfg;
struct hugepage_file *hugepage = NULL, *tmp_hp = NULL;
struct hugepage_info used_hp[MAX_HUGEPAGE_SIZES];
struct internal_config *internal_conf =
eal_get_internal_configuration();
uint64_t memory[RTE_MAX_NUMA_NODES];
unsigned hp_offset;
int i, j;
int nr_hugefiles, nr_hugepages = 0;
void *addr;
memset(used_hp, 0, sizeof(used_hp));
/* get pointer to global configuration */
mcfg = rte_eal_get_configuration()->mem_config;
/* hugetlbfs can be disabled */
if (internal_conf->no_hugetlbfs) {
void *prealloc_addr;
size_t mem_sz;
struct rte_memseg_list *msl;
int n_segs, fd, flags;
#ifdef MEMFD_SUPPORTED
int memfd;
#endif
uint64_t page_sz;
/* nohuge mode is legacy mode */
internal_conf->legacy_mem = 1;
/* nohuge mode is single-file segments mode */
internal_conf->single_file_segments = 1;
/* create a memseg list */
msl = &mcfg->memsegs[0];
mem_sz = internal_conf->memory;
page_sz = RTE_PGSIZE_4K;
n_segs = mem_sz / page_sz;
if (eal_memseg_list_init_named(
msl, "nohugemem", page_sz, n_segs, 0, true)) {
return -1;
}
/* set up parameters for anonymous mmap */
fd = -1;
flags = MAP_PRIVATE | MAP_ANONYMOUS;
#ifdef MEMFD_SUPPORTED
/* create a memfd and store it in the segment fd table */
memfd = memfd_create("nohuge", 0);
if (memfd < 0) {
RTE_LOG(DEBUG, EAL, "Cannot create memfd: %s\n",
strerror(errno));
RTE_LOG(DEBUG, EAL, "Falling back to anonymous map\n");
} else {
/* we got an fd - now resize it */
if (ftruncate(memfd, internal_conf->memory) < 0) {
RTE_LOG(ERR, EAL, "Cannot resize memfd: %s\n",
strerror(errno));
RTE_LOG(ERR, EAL, "Falling back to anonymous map\n");
close(memfd);
} else {
/* creating memfd-backed file was successful.
* we want changes to memfd to be visible to
* other processes (such as vhost backend), so
* map it as shared memory.
*/
RTE_LOG(DEBUG, EAL, "Using memfd for anonymous memory\n");
fd = memfd;
flags = MAP_SHARED;
}
}
#endif
/* preallocate address space for the memory, so that it can be
* fit into the DMA mask.
*/
if (eal_memseg_list_alloc(msl, 0)) {
RTE_LOG(ERR, EAL, "Cannot preallocate VA space for hugepage memory\n");
return -1;
}
prealloc_addr = msl->base_va;
addr = mmap(prealloc_addr, mem_sz, PROT_READ | PROT_WRITE,
flags | MAP_FIXED, fd, 0);
if (addr == MAP_FAILED || addr != prealloc_addr) {
RTE_LOG(ERR, EAL, "%s: mmap() failed: %s\n", __func__,
strerror(errno));
munmap(prealloc_addr, mem_sz);
return -1;
}
/* we're in single-file segments mode, so only the segment list
* fd needs to be set up.
*/
if (fd != -1) {
if (eal_memalloc_set_seg_list_fd(0, fd) < 0) {
RTE_LOG(ERR, EAL, "Cannot set up segment list fd\n");
/* not a serious error, proceed */
}
}
eal_memseg_list_populate(msl, addr, n_segs);
if (mcfg->dma_maskbits &&
rte_mem_check_dma_mask_thread_unsafe(mcfg->dma_maskbits)) {
RTE_LOG(ERR, EAL,
"%s(): couldn't allocate memory due to IOVA exceeding limits of current DMA mask.\n",
__func__);
if (rte_eal_iova_mode() == RTE_IOVA_VA &&
rte_eal_using_phys_addrs())
RTE_LOG(ERR, EAL,
"%s(): Please try initializing EAL with --iova-mode=pa parameter.\n",
__func__);
goto fail;
}
return 0;
}
/* calculate total number of hugepages available. at this point we haven't
* yet started sorting them so they all are on socket 0 */
for (i = 0; i < (int) internal_conf->num_hugepage_sizes; i++) {
/* meanwhile, also initialize used_hp hugepage sizes in used_hp */
used_hp[i].hugepage_sz = internal_conf->hugepage_info[i].hugepage_sz;
nr_hugepages += internal_conf->hugepage_info[i].num_pages[0];
}
/*
* allocate a memory area for hugepage table.
* this isn't shared memory yet. due to the fact that we need some
* processing done on these pages, shared memory will be created
* at a later stage.
*/
tmp_hp = malloc(nr_hugepages * sizeof(struct hugepage_file));
if (tmp_hp == NULL)
goto fail;
memset(tmp_hp, 0, nr_hugepages * sizeof(struct hugepage_file));
hp_offset = 0; /* where we start the current page size entries */
huge_register_sigbus();
/* make a copy of socket_mem, needed for balanced allocation. */
for (i = 0; i < RTE_MAX_NUMA_NODES; i++)
memory[i] = internal_conf->socket_mem[i];
/* map all hugepages and sort them */
for (i = 0; i < (int)internal_conf->num_hugepage_sizes; i++) {
unsigned pages_old, pages_new;
struct hugepage_info *hpi;
/*
* we don't yet mark hugepages as used at this stage, so
* we just map all hugepages available to the system
* all hugepages are still located on socket 0
*/
hpi = &internal_conf->hugepage_info[i];
if (hpi->num_pages[0] == 0)
continue;
/* map all hugepages available */
pages_old = hpi->num_pages[0];
pages_new = map_all_hugepages(&tmp_hp[hp_offset], hpi, memory);
if (pages_new < pages_old) {
RTE_LOG(DEBUG, EAL,
"%d not %d hugepages of size %u MB allocated\n",
pages_new, pages_old,
(unsigned)(hpi->hugepage_sz / 0x100000));
int pages = pages_old - pages_new;
nr_hugepages -= pages;
hpi->num_pages[0] = pages_new;
if (pages_new == 0)
continue;
}
if (rte_eal_using_phys_addrs() &&
rte_eal_iova_mode() != RTE_IOVA_VA) {
/* find physical addresses for each hugepage */
if (find_physaddrs(&tmp_hp[hp_offset], hpi) < 0) {
RTE_LOG(DEBUG, EAL, "Failed to find phys addr "
"for %u MB pages\n",
(unsigned int)(hpi->hugepage_sz / 0x100000));
goto fail;
}
} else {
/* set physical addresses for each hugepage */
if (set_physaddrs(&tmp_hp[hp_offset], hpi) < 0) {
RTE_LOG(DEBUG, EAL, "Failed to set phys addr "
"for %u MB pages\n",
(unsigned int)(hpi->hugepage_sz / 0x100000));
goto fail;
}
}
if (find_numasocket(&tmp_hp[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;
}
qsort(&tmp_hp[hp_offset], hpi->num_pages[0],
sizeof(struct hugepage_file), cmp_physaddr);
/* we have processed a num of hugepages of this size, so inc offset */
hp_offset += hpi->num_pages[0];
}
huge_recover_sigbus();
if (internal_conf->memory == 0 && internal_conf->force_sockets == 0)
internal_conf->memory = eal_get_hugepage_mem_size();
nr_hugefiles = nr_hugepages;
/* clean out the numbers of pages */
for (i = 0; i < (int) internal_conf->num_hugepage_sizes; i++)
for (j = 0; j < RTE_MAX_NUMA_NODES; j++)
internal_conf->hugepage_info[i].num_pages[j] = 0;
/* get hugepages for each socket */
for (i = 0; i < nr_hugefiles; i++) {
int socket = tmp_hp[i].socket_id;
/* find a hugepage info with right size and increment num_pages */
const int nb_hpsizes = RTE_MIN(MAX_HUGEPAGE_SIZES,
(int)internal_conf->num_hugepage_sizes);
for (j = 0; j < nb_hpsizes; j++) {
if (tmp_hp[i].size ==
internal_conf->hugepage_info[j].hugepage_sz) {
internal_conf->hugepage_info[j].num_pages[socket]++;
}
}
}
/* make a copy of socket_mem, needed for number of pages calculation */
for (i = 0; i < RTE_MAX_NUMA_NODES; i++)
memory[i] = internal_conf->socket_mem[i];
/* calculate final number of pages */
nr_hugepages = eal_dynmem_calc_num_pages_per_socket(memory,
internal_conf->hugepage_info, used_hp,
internal_conf->num_hugepage_sizes);
/* error if not enough memory available */
if (nr_hugepages < 0)
goto fail;
/* reporting in! */
for (i = 0; i < (int) internal_conf->num_hugepage_sizes; i++) {
for (j = 0; j < RTE_MAX_NUMA_NODES; j++) {
if (used_hp[i].num_pages[j] > 0) {
RTE_LOG(DEBUG, EAL,
"Requesting %u pages of size %uMB"
" from socket %i\n",
used_hp[i].num_pages[j],
(unsigned)
(used_hp[i].hugepage_sz / 0x100000),
j);
}
}
}
/* create shared memory */
hugepage = create_shared_memory(eal_hugepage_data_path(),
nr_hugefiles * sizeof(struct hugepage_file));
if (hugepage == NULL) {
RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
goto fail;
}
memset(hugepage, 0, nr_hugefiles * sizeof(struct hugepage_file));
/*
* unmap pages that we won't need (looks at used_hp).
* also, sets final_va to NULL on pages that were unmapped.
*/
if (unmap_unneeded_hugepages(tmp_hp, used_hp,
internal_conf->num_hugepage_sizes) < 0) {
RTE_LOG(ERR, EAL, "Unmapping and locking hugepages failed!\n");
goto fail;
}
/*
* copy stuff from malloc'd hugepage* to the actual shared memory.
* this procedure only copies those hugepages that have orig_va
* not NULL. has overflow protection.
*/
if (copy_hugepages_to_shared_mem(hugepage, nr_hugefiles,
tmp_hp, nr_hugefiles) < 0) {
RTE_LOG(ERR, EAL, "Copying tables to shared memory failed!\n");
goto fail;
}
#ifndef RTE_ARCH_64
/* for legacy 32-bit mode, we did not preallocate VA space, so do it */
if (internal_conf->legacy_mem &&
prealloc_segments(hugepage, nr_hugefiles)) {
RTE_LOG(ERR, EAL, "Could not preallocate VA space for hugepages\n");
goto fail;
}
#endif
/* remap all pages we do need into memseg list VA space, so that those
* pages become first-class citizens in DPDK memory subsystem
*/
if (remap_needed_hugepages(hugepage, nr_hugefiles)) {
RTE_LOG(ERR, EAL, "Couldn't remap hugepage files into memseg lists\n");
goto fail;
}
/* free the hugepage backing files */
if (internal_conf->hugepage_unlink &&
unlink_hugepage_files(tmp_hp, internal_conf->num_hugepage_sizes) < 0) {
RTE_LOG(ERR, EAL, "Unlinking hugepage files failed!\n");
goto fail;
}
/* free the temporary hugepage table */
free(tmp_hp);
tmp_hp = NULL;
munmap(hugepage, nr_hugefiles * sizeof(struct hugepage_file));
hugepage = NULL;
/* we're not going to allocate more pages, so release VA space for
* unused memseg lists
*/
for (i = 0; i < RTE_MAX_MEMSEG_LISTS; i++) {
struct rte_memseg_list *msl = &mcfg->memsegs[i];
size_t mem_sz;
/* skip inactive lists */
if (msl->base_va == NULL)
continue;
/* skip lists where there is at least one page allocated */
if (msl->memseg_arr.count > 0)
continue;
/* this is an unused list, deallocate it */
mem_sz = msl->len;
munmap(msl->base_va, mem_sz);
msl->base_va = NULL;
msl->heap = 0;
/* destroy backing fbarray */
rte_fbarray_destroy(&msl->memseg_arr);
}
if (mcfg->dma_maskbits &&
rte_mem_check_dma_mask_thread_unsafe(mcfg->dma_maskbits)) {
RTE_LOG(ERR, EAL,
"%s(): couldn't allocate memory due to IOVA exceeding limits of current DMA mask.\n",
__func__);
goto fail;
}
return 0;
fail:
huge_recover_sigbus();
free(tmp_hp);
if (hugepage != NULL)
munmap(hugepage, nr_hugefiles * sizeof(struct hugepage_file));
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
eal_legacy_hugepage_attach(void)
{
struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
struct hugepage_file *hp = NULL;
unsigned int num_hp = 0;
unsigned int i = 0;
unsigned int cur_seg;
off_t size = 0;
int fd, 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_hugepage = open(eal_hugepage_data_path(), O_RDONLY);
if (fd_hugepage < 0) {
RTE_LOG(ERR, EAL, "Could not open %s\n",
eal_hugepage_data_path());
goto error;
}
size = getFileSize(fd_hugepage);
hp = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd_hugepage, 0);
if (hp == MAP_FAILED) {
RTE_LOG(ERR, EAL, "Could not mmap %s\n",
eal_hugepage_data_path());
goto error;
}
num_hp = size / sizeof(struct hugepage_file);
RTE_LOG(DEBUG, EAL, "Analysing %u files\n", num_hp);
/* map all segments into memory to make sure we get the addrs. the
* segments themselves are already in memseg list (which is shared and
* has its VA space already preallocated), so we just need to map
* everything into correct addresses.
*/
for (i = 0; i < num_hp; i++) {
struct hugepage_file *hf = &hp[i];
size_t map_sz = hf->size;
void *map_addr = hf->final_va;
int msl_idx, ms_idx;
struct rte_memseg_list *msl;
struct rte_memseg *ms;
/* if size is zero, no more pages left */
if (map_sz == 0)
break;
fd = open(hf->filepath, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "Could not open %s: %s\n",
hf->filepath, strerror(errno));
goto error;
}
map_addr = mmap(map_addr, map_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FIXED, fd, 0);
if (map_addr == MAP_FAILED) {
RTE_LOG(ERR, EAL, "Could not map %s: %s\n",
hf->filepath, strerror(errno));
goto fd_error;
}
/* set shared lock on the file. */
if (flock(fd, LOCK_SH) < 0) {
RTE_LOG(DEBUG, EAL, "%s(): Locking file failed: %s\n",
__func__, strerror(errno));
goto mmap_error;
}
/* find segment data */
msl = rte_mem_virt2memseg_list(map_addr);
if (msl == NULL) {
RTE_LOG(DEBUG, EAL, "%s(): Cannot find memseg list\n",
__func__);
goto mmap_error;
}
ms = rte_mem_virt2memseg(map_addr, msl);
if (ms == NULL) {
RTE_LOG(DEBUG, EAL, "%s(): Cannot find memseg\n",
__func__);
goto mmap_error;
}
msl_idx = msl - mcfg->memsegs;
ms_idx = rte_fbarray_find_idx(&msl->memseg_arr, ms);
if (ms_idx < 0) {
RTE_LOG(DEBUG, EAL, "%s(): Cannot find memseg idx\n",
__func__);
goto mmap_error;
}
/* store segment fd internally */
if (eal_memalloc_set_seg_fd(msl_idx, ms_idx, fd) < 0)
RTE_LOG(ERR, EAL, "Could not store segment fd: %s\n",
rte_strerror(rte_errno));
}
/* unmap the hugepage config file, since we are done using it */
munmap(hp, size);
close(fd_hugepage);
return 0;
mmap_error:
munmap(hp[i].final_va, hp[i].size);
fd_error:
close(fd);
error:
/* unwind mmap's done so far */
for (cur_seg = 0; cur_seg < i; cur_seg++)
munmap(hp[cur_seg].final_va, hp[cur_seg].size);
if (hp != NULL && hp != MAP_FAILED)
munmap(hp, size);
if (fd_hugepage >= 0)
close(fd_hugepage);
return -1;
}
static int
eal_hugepage_attach(void)
{
if (eal_memalloc_sync_with_primary()) {
RTE_LOG(ERR, EAL, "Could not map memory from primary process\n");
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");
return -1;
}
return 0;
}
int
rte_eal_hugepage_init(void)
{
const struct internal_config *internal_conf =
eal_get_internal_configuration();
return internal_conf->legacy_mem ?
eal_legacy_hugepage_init() :
eal_dynmem_hugepage_init();
}
int
rte_eal_hugepage_attach(void)
{
const struct internal_config *internal_conf =
eal_get_internal_configuration();
return internal_conf->legacy_mem ?
eal_legacy_hugepage_attach() :
eal_hugepage_attach();
}
int
rte_eal_using_phys_addrs(void)
{
if (phys_addrs_available == -1) {
uint64_t tmp = 0;
if (rte_eal_has_hugepages() != 0 &&
rte_mem_virt2phy(&tmp) != RTE_BAD_PHYS_ADDR)
phys_addrs_available = 1;
else
phys_addrs_available = 0;
}
return phys_addrs_available;
}
static int __rte_unused
memseg_primary_init_32(void)
{
struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
int active_sockets, hpi_idx, msl_idx = 0;
unsigned int socket_id, i;
struct rte_memseg_list *msl;
uint64_t extra_mem_per_socket, total_extra_mem, total_requested_mem;
uint64_t max_mem;
struct internal_config *internal_conf =
eal_get_internal_configuration();
/* no-huge does not need this at all */
if (internal_conf->no_hugetlbfs)
return 0;
/* this is a giant hack, but desperate times call for desperate
* measures. in legacy 32-bit mode, we cannot preallocate VA space,
* because having upwards of 2 gigabytes of VA space already mapped will
* interfere with our ability to map and sort hugepages.
*
* therefore, in legacy 32-bit mode, we will be initializing memseg
* lists much later - in eal_memory.c, right after we unmap all the
* unneeded pages. this will not affect secondary processes, as those
* should be able to mmap the space without (too many) problems.
*/
if (internal_conf->legacy_mem)
return 0;
/* 32-bit mode is a very special case. we cannot know in advance where
* the user will want to allocate their memory, so we have to do some
* heuristics.
*/
active_sockets = 0;
total_requested_mem = 0;
if (internal_conf->force_sockets)
for (i = 0; i < rte_socket_count(); i++) {
uint64_t mem;
socket_id = rte_socket_id_by_idx(i);
mem = internal_conf->socket_mem[socket_id];
if (mem == 0)
continue;
active_sockets++;
total_requested_mem += mem;
}
else
total_requested_mem = internal_conf->memory;
max_mem = (uint64_t)RTE_MAX_MEM_MB << 20;
if (total_requested_mem > max_mem) {
RTE_LOG(ERR, EAL, "Invalid parameters: 32-bit process can at most use %uM of memory\n",
(unsigned int)(max_mem >> 20));
return -1;
}
total_extra_mem = max_mem - total_requested_mem;
extra_mem_per_socket = active_sockets == 0 ? total_extra_mem :
total_extra_mem / active_sockets;
/* the allocation logic is a little bit convoluted, but here's how it
* works, in a nutshell:
* - if user hasn't specified on which sockets to allocate memory via
* --socket-mem, we allocate all of our memory on main core socket.
* - if user has specified sockets to allocate memory on, there may be
* some "unused" memory left (e.g. if user has specified --socket-mem
* such that not all memory adds up to 2 gigabytes), so add it to all
* sockets that are in use equally.
*
* page sizes are sorted by size in descending order, so we can safely
* assume that we dispense with bigger page sizes first.
*/
/* create memseg lists */
for (i = 0; i < rte_socket_count(); i++) {
int hp_sizes = (int) internal_conf->num_hugepage_sizes;
uint64_t max_socket_mem, cur_socket_mem;
unsigned int main_lcore_socket;
struct rte_config *cfg = rte_eal_get_configuration();
bool skip;
socket_id = rte_socket_id_by_idx(i);
#ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
/* we can still sort pages by socket in legacy mode */
if (!internal_conf->legacy_mem && socket_id > 0)
break;
#endif
/* if we didn't specifically request memory on this socket */
skip = active_sockets != 0 &&
internal_conf->socket_mem[socket_id] == 0;
/* ...or if we didn't specifically request memory on *any*
* socket, and this is not main lcore
*/
main_lcore_socket = rte_lcore_to_socket_id(cfg->main_lcore);
skip |= active_sockets == 0 && socket_id != main_lcore_socket;
if (skip) {
RTE_LOG(DEBUG, EAL, "Will not preallocate memory on socket %u\n",
socket_id);
continue;
}
/* max amount of memory on this socket */
max_socket_mem = (active_sockets != 0 ?
internal_conf->socket_mem[socket_id] :
internal_conf->memory) +
extra_mem_per_socket;
cur_socket_mem = 0;
for (hpi_idx = 0; hpi_idx < hp_sizes; hpi_idx++) {
uint64_t max_pagesz_mem, cur_pagesz_mem = 0;
uint64_t hugepage_sz;
struct hugepage_info *hpi;
int type_msl_idx, max_segs, total_segs = 0;
hpi = &internal_conf->hugepage_info[hpi_idx];
hugepage_sz = hpi->hugepage_sz;
/* check if pages are actually available */
if (hpi->num_pages[socket_id] == 0)
continue;
max_segs = RTE_MAX_MEMSEG_PER_TYPE;
max_pagesz_mem = max_socket_mem - cur_socket_mem;
/* make it multiple of page size */
max_pagesz_mem = RTE_ALIGN_FLOOR(max_pagesz_mem,
hugepage_sz);
RTE_LOG(DEBUG, EAL, "Attempting to preallocate "
"%" PRIu64 "M on socket %i\n",
max_pagesz_mem >> 20, socket_id);
type_msl_idx = 0;
while (cur_pagesz_mem < max_pagesz_mem &&
total_segs < max_segs) {
uint64_t cur_mem;
unsigned int n_segs;
if (msl_idx >= RTE_MAX_MEMSEG_LISTS) {
RTE_LOG(ERR, EAL,
"No more space in memseg lists, please increase %s\n",
RTE_STR(RTE_MAX_MEMSEG_LISTS));
return -1;
}
msl = &mcfg->memsegs[msl_idx];
cur_mem = get_mem_amount(hugepage_sz,
max_pagesz_mem);
n_segs = cur_mem / hugepage_sz;
if (eal_memseg_list_init(msl, hugepage_sz,
n_segs, socket_id, type_msl_idx,
true)) {
/* failing to allocate a memseg list is
* a serious error.
*/
RTE_LOG(ERR, EAL, "Cannot allocate memseg list\n");
return -1;
}
if (eal_memseg_list_alloc(msl, 0)) {
/* if we couldn't allocate VA space, we
* can try with smaller page sizes.
*/
RTE_LOG(ERR, EAL, "Cannot allocate VA space for memseg list, retrying with different page size\n");
/* deallocate memseg list */
if (memseg_list_free(msl))
return -1;
break;
}
total_segs += msl->memseg_arr.len;
cur_pagesz_mem = total_segs * hugepage_sz;
type_msl_idx++;
msl_idx++;
}
cur_socket_mem += cur_pagesz_mem;
}
if (cur_socket_mem == 0) {
RTE_LOG(ERR, EAL, "Cannot allocate VA space on socket %u\n",
socket_id);
return -1;
}
}
return 0;
}
static int __rte_unused
memseg_primary_init(void)
{
return eal_dynmem_memseg_lists_init();
}
static int
memseg_secondary_init(void)
{
struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
int msl_idx = 0;
struct rte_memseg_list *msl;
for (msl_idx = 0; msl_idx < RTE_MAX_MEMSEG_LISTS; msl_idx++) {
msl = &mcfg->memsegs[msl_idx];
/* skip empty and external memseg lists */
if (msl->memseg_arr.len == 0 || msl->external)
continue;
if (rte_fbarray_attach(&msl->memseg_arr)) {
RTE_LOG(ERR, EAL, "Cannot attach to primary process memseg lists\n");
return -1;
}
/* preallocate VA space */
if (eal_memseg_list_alloc(msl, 0)) {
RTE_LOG(ERR, EAL, "Cannot preallocate VA space for hugepage memory\n");
return -1;
}
}
return 0;
}
int
rte_eal_memseg_init(void)
{
/* increase rlimit to maximum */
struct rlimit lim;
#ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
const struct internal_config *internal_conf =
eal_get_internal_configuration();
#endif
if (getrlimit(RLIMIT_NOFILE, &lim) == 0) {
/* set limit to maximum */
lim.rlim_cur = lim.rlim_max;
if (setrlimit(RLIMIT_NOFILE, &lim) < 0) {
RTE_LOG(DEBUG, EAL, "Setting maximum number of open files failed: %s\n",
strerror(errno));
} else {
RTE_LOG(DEBUG, EAL, "Setting maximum number of open files to %"
PRIu64 "\n",
(uint64_t)lim.rlim_cur);
}
} else {
RTE_LOG(ERR, EAL, "Cannot get current resource limits\n");
}
#ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
if (!internal_conf->legacy_mem && rte_socket_count() > 1) {
RTE_LOG(WARNING, EAL, "DPDK is running on a NUMA system, but is compiled without NUMA support.\n");
RTE_LOG(WARNING, EAL, "This will have adverse consequences for performance and usability.\n");
RTE_LOG(WARNING, EAL, "Please use --"OPT_LEGACY_MEM" option, or recompile with NUMA support.\n");
}
#endif
return rte_eal_process_type() == RTE_PROC_PRIMARY ?
#ifndef RTE_ARCH_64
memseg_primary_init_32() :
#else
memseg_primary_init() :
#endif
memseg_secondary_init();
}
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