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vr_dpdk_table_mem.c
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vr_dpdk_table_mem.c
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/*
* vr_dpdk_flow_mem.c -- memory allocation for flow table
*
* Copyright(c) 2014, Juniper Networks Inc.,
* All rights reserved
*/
#include <stdint.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "vr_dpdk.h"
#include "vr_btable.h"
#include "vr_mem.h"
#include "nl_util.h"
#include <rte_errno.h>
#define MAX_LINE_SIZE 128
#define HPI_MAX 16
#define MOUNT_TABLE "/proc/mounts"
struct vr_hugepage_info {
char *mnt;
size_t page_size;
size_t size;
uint32_t num_pages;
} vr_hugepage_md[HPI_MAX];
extern void *vr_flow_table, *vr_oflow_table;
extern void *vr_bridge_table, *vr_bridge_otable;
extern unsigned char *vr_flow_path, *vr_bridge_table_path;
static int
vr_hugepage_info_init(void)
{
unsigned int i = 0, multiple = 1;
char *str, *token;
char *dev, *mnt, *fs, *options, *size;
char *size_attr, *sys_hp_file;
FILE *fp = NULL, *sys_fp = NULL;
struct vr_hugepage_info *hp;
char line[MAX_LINE_SIZE];
char nr_pages[MAX_LINE_SIZE];
fp = fopen(MOUNT_TABLE, "r");
if (!fp)
return -errno;
while (fgets(line, MAX_LINE_SIZE, fp)) {
if (i >= HPI_MAX)
break;
if ((str = strstr(line, "hugetlbfs"))) {
hp = &vr_hugepage_md[i++];
dev = strtok(line, " ");
mnt = strtok(NULL, " ");
fs = strtok(NULL, " ");
options = strtok(NULL, " ");
RTE_SET_USED(fs);
RTE_SET_USED(dev);
RTE_SET_USED(token);
hp->mnt = malloc(strlen(mnt) + 1);
memcpy(hp->mnt, mnt, strlen(mnt) + 1);
if (strstr(options, "pagesize=1G")) {
hp->page_size = (1024 * 1024 * 1024);
sys_hp_file =
"/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages";
} else {
hp->page_size = (2 * 1024 * 1024);
sys_hp_file =
"/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages";
}
size = strstr(options, "size=");
if (size && (size != options) && (*(size - 1) != ','))
size = strstr(size + 1, "size=");
if (size && ((size == options) || (*(size - 1) == ','))) {
size += strlen("size=");
size = strtok(size, ",");
size_attr = size + strlen(size) - 1;
switch (*size_attr) {
case 'k':
case 'K':
multiple = 1024;
*size_attr = '\0';
break;
case 'M':
case 'm':
multiple = 1024 * 1024;
*size_attr = '\0';
break;
case 'G':
case 'g':
multiple = 1024 * 1024 * 1024;
*size_attr = '\0';
break;
}
hp->size = strtoul(size, NULL, 0) * multiple;
hp->num_pages = hp->size / hp->page_size;
} else {
sys_fp = fopen(sys_hp_file, "r");
if (!sys_fp)
goto exit_func;
str = fgets(nr_pages, MAX_LINE_SIZE, sys_fp);
if (str == NULL)
goto exit_func;
hp->num_pages = strtoul(nr_pages, NULL, 0);
hp->size = hp->num_pages * hp->page_size;
}
}
}
exit_func:
if (fp)
fclose(fp);
if (sys_fp)
fclose(sys_fp);
return 0;
}
int
vr_dpdk_table_mem_init(unsigned int table, unsigned int entries,
unsigned long size, unsigned int oentries, unsigned long osize)
{
int ret, i, fd;
void **table_p;
char shm_file[VR_UNIX_PATH_MAX];
char *file_name, *touse_file_name = NULL;
char *shmem_name, *hp_file_name;
unsigned char **path;
struct stat f_stat;
struct vr_hugepage_info *hpi;
if (!oentries) {
oentries = (entries / 5 + 1023) & ~1023;
osize = (size / entries) * oentries;
}
size += osize;
switch (table) {
case VR_MEM_FLOW_TABLE_OBJECT:
shmem_name = "flow.shmem";
hp_file_name = "flow";
table_p = &vr_dpdk.flow_table;
path = &vr_flow_path;
vr_oflow_entries = oentries;
break;
case VR_MEM_BRIDGE_TABLE_OBJECT:
shmem_name = "bridge.shmem";
hp_file_name = "bridge";
table_p = &vr_dpdk.bridge_table;
path = &vr_bridge_table_path;
vr_bridge_oentries = oentries;
break;
default:
return -EINVAL;
}
if (no_huge_set) {
/* Create a shared memory under the socket directory. */
ret = snprintf(shm_file, sizeof(shm_file), "%s/%s",
vr_socket_dir, shmem_name);
if (ret >= sizeof(shm_file)) {
RTE_LOG(ERR, VROUTER, "Error creating shared memory file\n");
return -ENOMEM;
}
touse_file_name = shm_file;
} else {
ret = vr_hugepage_info_init();
if (ret < 0) {
RTE_LOG(ERR, VROUTER, "Error initializing hugepage info: %s (%d)\n",
rte_strerror(-ret), -ret);
return ret;
}
for (i = 0; i < HPI_MAX; i++) {
hpi = &vr_hugepage_md[i];
if (!hpi->mnt)
continue;
file_name = malloc(strlen(hpi->mnt) + strlen(hp_file_name) + 1);
sprintf(file_name, "%s/%s", hpi->mnt, hp_file_name);
if (stat(file_name, &f_stat) == -1) {
if (!touse_file_name) {
if (hpi->size >= size) {
touse_file_name = file_name;
} else {
free(file_name);
}
}
} else {
free(touse_file_name);
touse_file_name = file_name;
break;
}
}
}
if (touse_file_name) {
fd = open(touse_file_name, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
if (fd == -1) {
RTE_LOG(ERR, VROUTER, "Error opening file \"%s\": %s (%d)\n",
touse_file_name, rte_strerror(errno), errno);
return -errno;
}
if (no_huge_set) {
ret = ftruncate(fd, size);
if (ret == -1) {
RTE_LOG(ERR, VROUTER, "Error truncating file %s: %s (%d)\n",
touse_file_name, rte_strerror(errno), errno);
return -errno;
}
}
*table_p = mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
/* the file descriptor is no longer needed */
close(fd);
if (*table_p == MAP_FAILED) {
RTE_LOG(ERR, VROUTER, "Error mmapping file %s: %s (%d)\n",
touse_file_name, rte_strerror(errno), errno);
return -errno;
}
memset(*table_p, 0, size);
*path = (unsigned char *)touse_file_name;
}
return 0;
}
int
vr_dpdk_bridge_init(void)
{
if (!vr_dpdk.bridge_table)
return -1;
vr_bridge_table = vr_dpdk.bridge_table;
vr_bridge_otable = vr_dpdk.bridge_table + VR_BRIDGE_TABLE_SIZE;
return 0;
}
int
vr_dpdk_flow_init(void)
{
if (!vr_dpdk.flow_table)
return -1;
vr_flow_table = vr_dpdk.flow_table;
vr_oflow_table = vr_dpdk.flow_table + VR_FLOW_TABLE_SIZE;
if (!vr_flow_table)
return -1;
vr_flow_hold_limit = VR_DPDK_MAX_FLOW_TABLE_HOLD_COUNT;
RTE_LOG(INFO, VROUTER, "Max HOLD flow entries set to %u\n",
vr_flow_hold_limit);
return 0;
}