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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <pthread.h>
#include <signal.h>
#include <sched.h>
#include <assert.h>
#include <string.h>
#include <rte_lcore.h>
#include <rte_memory.h>
#include <rte_log.h>
#include "eal_private.h"
#include "eal_thread.h"
RTE_DECLARE_PER_LCORE(unsigned , _socket_id);
unsigned rte_socket_id(void)
{
return RTE_PER_LCORE(_socket_id);
}
int
rte_lcore_has_role(unsigned int lcore_id, enum rte_lcore_role_t role)
{
struct rte_config *cfg = rte_eal_get_configuration();
if (lcore_id >= RTE_MAX_LCORE)
return -EINVAL;
return cfg->lcore_role[lcore_id] == role;
}
int eal_cpuset_socket_id(rte_cpuset_t *cpusetp)
{
unsigned cpu = 0;
int socket_id = SOCKET_ID_ANY;
int sid;
if (cpusetp == NULL)
return SOCKET_ID_ANY;
do {
if (!CPU_ISSET(cpu, cpusetp))
continue;
if (socket_id == SOCKET_ID_ANY)
socket_id = eal_cpu_socket_id(cpu);
sid = eal_cpu_socket_id(cpu);
if (socket_id != sid) {
socket_id = SOCKET_ID_ANY;
break;
}
} while (++cpu < RTE_MAX_LCORE);
return socket_id;
}
int
rte_thread_set_affinity(rte_cpuset_t *cpusetp)
{
int s;
unsigned lcore_id;
pthread_t tid;
tid = pthread_self();
s = pthread_setaffinity_np(tid, sizeof(rte_cpuset_t), cpusetp);
if (s != 0) {
RTE_LOG(ERR, EAL, "pthread_setaffinity_np failed\n");
return -1;
}
/* store socket_id in TLS for quick access */
RTE_PER_LCORE(_socket_id) =
eal_cpuset_socket_id(cpusetp);
/* store cpuset in TLS for quick access */
memmove(&RTE_PER_LCORE(_cpuset), cpusetp,
sizeof(rte_cpuset_t));
lcore_id = rte_lcore_id();
if (lcore_id != (unsigned)LCORE_ID_ANY) {
/* EAL thread will update lcore_config */
lcore_config[lcore_id].socket_id = RTE_PER_LCORE(_socket_id);
memmove(&lcore_config[lcore_id].cpuset, cpusetp,
sizeof(rte_cpuset_t));
}
return 0;
}
void
rte_thread_get_affinity(rte_cpuset_t *cpusetp)
{
assert(cpusetp);
memmove(cpusetp, &RTE_PER_LCORE(_cpuset),
sizeof(rte_cpuset_t));
}
int
eal_thread_dump_affinity(char *str, unsigned size)
{
rte_cpuset_t cpuset;
unsigned cpu;
int ret;
unsigned int out = 0;
rte_thread_get_affinity(&cpuset);
for (cpu = 0; cpu < RTE_MAX_LCORE; cpu++) {
if (!CPU_ISSET(cpu, &cpuset))
continue;
ret = snprintf(str + out,
size - out, "%u,", cpu);
if (ret < 0 || (unsigned)ret >= size - out) {
/* string will be truncated */
ret = -1;
goto exit;
}
out += ret;
}
ret = 0;
exit:
/* remove the last separator */
if (out > 0)
str[out - 1] = '\0';
return ret;
}
struct rte_thread_ctrl_params {
void *(*start_routine)(void *);
void *arg;
pthread_barrier_t configured;
};
static void *rte_thread_init(void *arg)
{
int ret;
struct rte_thread_ctrl_params *params = arg;
void *(*start_routine)(void *) = params->start_routine;
void *routine_arg = params->arg;
ret = pthread_barrier_wait(¶ms->configured);
if (ret == PTHREAD_BARRIER_SERIAL_THREAD) {
pthread_barrier_destroy(¶ms->configured);
free(params);
}
return start_routine(routine_arg);
}
__rte_experimental int
rte_ctrl_thread_create(pthread_t *thread, const char *name,
const pthread_attr_t *attr,
void *(*start_routine)(void *), void *arg)
{
struct rte_thread_ctrl_params *params;
unsigned int lcore_id;
rte_cpuset_t cpuset;
int cpu_found, ret;
params = malloc(sizeof(*params));
if (!params)
return -ENOMEM;
params->start_routine = start_routine;
params->arg = arg;
pthread_barrier_init(¶ms->configured, NULL, 2);
ret = pthread_create(thread, attr, rte_thread_init, (void *)params);
if (ret != 0) {
free(params);
return -ret;
}
if (name != NULL) {
ret = rte_thread_setname(*thread, name);
if (ret < 0)
RTE_LOG(DEBUG, EAL,
"Cannot set name for ctrl thread\n");
}
cpu_found = 0;
CPU_ZERO(&cpuset);
for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
if (eal_cpu_detected(lcore_id) &&
rte_lcore_has_role(lcore_id, ROLE_OFF)) {
CPU_SET(lcore_id, &cpuset);
cpu_found = 1;
}
}
/* if no detected cpu is off, use master core */
if (!cpu_found)
CPU_SET(rte_get_master_lcore(), &cpuset);
ret = pthread_setaffinity_np(*thread, sizeof(cpuset), &cpuset);
if (ret < 0)
goto fail;
ret = pthread_barrier_wait(¶ms->configured);
if (ret == PTHREAD_BARRIER_SERIAL_THREAD) {
pthread_barrier_destroy(¶ms->configured);
free(params);
}
return 0;
fail:
if (PTHREAD_BARRIER_SERIAL_THREAD ==
pthread_barrier_wait(¶ms->configured)) {
pthread_barrier_destroy(¶ms->configured);
free(params);
}
pthread_cancel(*thread);
pthread_join(*thread, NULL);
return -ret;
}
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