DPDK  19.11.14-rc1
examples/l2fwd-keepalive/ka-agent/main.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2016 Intel Corporation
*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <sys/queue.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <time.h>
#include <rte_keepalive.h>
#include <shm.h>
#define MAX_TIMEOUTS 4
#define SEM_TIMEOUT_SECS 2
static struct rte_keepalive_shm *ka_shm_create(void)
{
int fd = shm_open(RTE_KEEPALIVE_SHM_NAME, O_RDWR, 0666);
size_t size = sizeof(struct rte_keepalive_shm);
struct rte_keepalive_shm *shm;
if (fd < 0)
printf("Failed to open %s as SHM:%s\n",
RTE_KEEPALIVE_SHM_NAME,
strerror(errno));
else {
shm = (struct rte_keepalive_shm *) mmap(
0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
close(fd);
if (shm == MAP_FAILED)
printf("Failed to mmap SHM:%s\n", strerror(errno));
else
return shm;
}
/* Reset to zero, as it was set to MAP_FAILED aka: (void *)-1 */
shm = 0;
return NULL;
}
int main(void)
{
struct rte_keepalive_shm *shm = ka_shm_create();
struct timespec timeout = { .tv_nsec = 0 };
int idx_core;
int cnt_cores;
uint64_t last_seen_alive_time = 0;
uint64_t most_recent_alive_time;
int cnt_timeouts = 0;
int sem_errno;
if (shm == NULL) {
printf("Unable to access shared core state\n");
return 1;
}
while (1) {
most_recent_alive_time = 0;
for (idx_core = 0; idx_core < RTE_KEEPALIVE_MAXCORES;
idx_core++)
if (shm->core_last_seen_times[idx_core] >
most_recent_alive_time)
most_recent_alive_time =
shm->core_last_seen_times[idx_core];
timeout.tv_sec = time(NULL) + SEM_TIMEOUT_SECS;
if (sem_timedwait(&shm->core_died, &timeout) == -1) {
/* Assume no core death signals and no change in any
* last-seen times is the keepalive monitor itself
* failing.
*/
sem_errno = errno;
last_seen_alive_time = most_recent_alive_time;
if (sem_errno == ETIMEDOUT) {
if (last_seen_alive_time ==
most_recent_alive_time &&
cnt_timeouts++ >
MAX_TIMEOUTS) {
printf("No updates. Exiting..\n");
break;
}
} else
printf("sem_timedwait() error (%s)\n",
strerror(sem_errno));
continue;
}
cnt_timeouts = 0;
cnt_cores = 0;
for (idx_core = 0; idx_core < RTE_KEEPALIVE_MAXCORES;
idx_core++)
if (shm->core_state[idx_core] == RTE_KA_STATE_DEAD)
cnt_cores++;
if (cnt_cores == 0) {
/* Can happen if core was restarted since Semaphore
* was sent, due to agent being offline.
*/
printf("Warning: Empty dead core report\n");
continue;
}
printf("%i dead cores: ", cnt_cores);
for (idx_core = 0;
idx_core++)
if (shm->core_state[idx_core] == RTE_KA_STATE_DEAD)
printf("%d, ", idx_core);
printf("\b\b\n");
}
if (munmap(shm, sizeof(struct rte_keepalive_shm)) != 0)
printf("Warning: munmap() failed\n");
return 0;
}