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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <pthread.h>
#include <sched.h>
#include <sys/queue.h>
#include <sys/syscall.h>
#include <rte_debug.h>
#include <rte_atomic.h>
#include <rte_launch.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_per_lcore.h>
#include <rte_eal.h>
#include <rte_lcore.h>
#include "eal_private.h"
#include "eal_thread.h"
RTE_DEFINE_PER_LCORE(unsigned, _lcore_id) = LCORE_ID_ANY;
RTE_DEFINE_PER_LCORE(unsigned, _socket_id) = (unsigned)SOCKET_ID_ANY;
RTE_DEFINE_PER_LCORE(rte_cpuset_t, _cpuset);
/*
* Send a message to a slave lcore identified by slave_id to call a
* function f with argument arg. Once the execution is done, the
* remote lcore switch in FINISHED state.
*/
int
rte_eal_remote_launch(int (*f)(void *), void *arg, unsigned slave_id)
{
int n;
char c = 0;
int m2s = lcore_config[slave_id].pipe_master2slave[1];
int s2m = lcore_config[slave_id].pipe_slave2master[0];
if (lcore_config[slave_id].state != WAIT)
return -EBUSY;
lcore_config[slave_id].f = f;
lcore_config[slave_id].arg = arg;
/* send message */
n = 0;
while (n == 0 || (n < 0 && errno == EINTR))
n = write(m2s, &c, 1);
if (n < 0)
rte_panic("cannot write on configuration pipe\n");
/* wait ack */
do {
n = read(s2m, &c, 1);
} while (n < 0 && errno == EINTR);
if (n <= 0)
rte_panic("cannot read on configuration pipe\n");
return 0;
}
/* set affinity for current EAL thread */
static int
eal_thread_set_affinity(void)
{
unsigned lcore_id = rte_lcore_id();
/* acquire system unique id */
rte_gettid();
/* update EAL thread core affinity */
return rte_thread_set_affinity(&lcore_config[lcore_id].cpuset);
}
void eal_thread_init_master(unsigned lcore_id)
{
/* set the lcore ID in per-lcore memory area */
RTE_PER_LCORE(_lcore_id) = lcore_id;
/* set CPU affinity */
if (eal_thread_set_affinity() < 0)
rte_panic("cannot set affinity\n");
}
/* main loop of threads */
__attribute__((noreturn)) void *
eal_thread_loop(__attribute__((unused)) void *arg)
{
char c;
int n, ret;
unsigned lcore_id;
pthread_t thread_id;
int m2s, s2m;
char cpuset[RTE_CPU_AFFINITY_STR_LEN];
thread_id = pthread_self();
/* retrieve our lcore_id from the configuration structure */
RTE_LCORE_FOREACH_SLAVE(lcore_id) {
if (thread_id == lcore_config[lcore_id].thread_id)
break;
}
if (lcore_id == RTE_MAX_LCORE)
rte_panic("cannot retrieve lcore id\n");
m2s = lcore_config[lcore_id].pipe_master2slave[0];
s2m = lcore_config[lcore_id].pipe_slave2master[1];
/* set the lcore ID in per-lcore memory area */
RTE_PER_LCORE(_lcore_id) = lcore_id;
/* set CPU affinity */
if (eal_thread_set_affinity() < 0)
rte_panic("cannot set affinity\n");
ret = eal_thread_dump_affinity(cpuset, sizeof(cpuset));
RTE_LOG(DEBUG, EAL, "lcore %u is ready (tid=%zx;cpuset=[%s%s])\n",
lcore_id, (uintptr_t)thread_id, cpuset, ret == 0 ? "" : "...");
/* read on our pipe to get commands */
while (1) {
void *fct_arg;
/* wait command */
do {
n = read(m2s, &c, 1);
} while (n < 0 && errno == EINTR);
if (n <= 0)
rte_panic("cannot read on configuration pipe\n");
lcore_config[lcore_id].state = RUNNING;
/* send ack */
n = 0;
while (n == 0 || (n < 0 && errno == EINTR))
n = write(s2m, &c, 1);
if (n < 0)
rte_panic("cannot write on configuration pipe\n");
if (lcore_config[lcore_id].f == NULL)
rte_panic("NULL function pointer\n");
/* call the function and store the return value */
fct_arg = lcore_config[lcore_id].arg;
ret = lcore_config[lcore_id].f(fct_arg);
lcore_config[lcore_id].ret = ret;
rte_wmb();
/* when a service core returns, it should go directly to WAIT
* state, because the application will not lcore_wait() for it.
*/
if (lcore_config[lcore_id].core_role == ROLE_SERVICE)
lcore_config[lcore_id].state = WAIT;
else
lcore_config[lcore_id].state = FINISHED;
}
/* never reached */
/* pthread_exit(NULL); */
/* return NULL; */
}
/* require calling thread tid by gettid() */
int rte_sys_gettid(void)
{
return (int)syscall(SYS_gettid);
}
int rte_thread_setname(pthread_t id, const char *name)
{
int ret = ENOSYS;
#if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
#if __GLIBC_PREREQ(2, 12)
ret = pthread_setname_np(id, name);
#endif
#endif
RTE_SET_USED(id);
RTE_SET_USED(name);
return -ret;
}
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