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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 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.
*/
#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_memzone.h>
#include <rte_per_lcore.h>
#include <rte_eal.h>
#include <rte_per_lcore.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, RTE_CPU_AFFINITY_STR_LEN);
RTE_LOG(DEBUG, EAL, "lcore %u is ready (tid=%x;cpuset=[%s%s])\n",
lcore_id, (int)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();
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);
}
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