DPDK  21.08.0
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
* This sample application is a simple multi-process application which
* demostrates sharing of queues and memory pools between processes, and
* using those queues/pools for communication between the processes.
* Application is designed to run with two processes, a primary and a
* secondary, and each accepts commands on the commandline, the most
* important of which is "send", which just sends a string to the other
* process.
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <sys/queue.h>
#include <rte_common.h>
#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_debug.h>
#include <rte_atomic.h>
#include <rte_ring.h>
#include <rte_log.h>
#include <rte_mempool.h>
#include <cmdline_rdline.h>
#include <cmdline_parse.h>
#include <cmdline_parse_string.h>
#include <cmdline_socket.h>
#include <cmdline.h>
#include "mp_commands.h"
static const char *_MSG_POOL = "MSG_POOL";
static const char *_SEC_2_PRI = "SEC_2_PRI";
static const char *_PRI_2_SEC = "PRI_2_SEC";
struct rte_ring *send_ring, *recv_ring;
struct rte_mempool *message_pool;
volatile int quit = 0;
static int
lcore_recv(__rte_unused void *arg)
unsigned lcore_id = rte_lcore_id();
printf("Starting core %u\n", lcore_id);
while (!quit){
void *msg;
if (rte_ring_dequeue(recv_ring, &msg) < 0){
printf("core %u: Received '%s'\n", lcore_id, (char *)msg);
rte_mempool_put(message_pool, msg);
return 0;
main(int argc, char **argv)
const unsigned flags = 0;
const unsigned ring_size = 64;
const unsigned pool_size = 1024;
const unsigned pool_cache = 32;
const unsigned priv_data_sz = 0;
int ret;
unsigned lcore_id;
ret = rte_eal_init(argc, argv);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Cannot init EAL\n");
/* Start of ring structure. 8< */
if (rte_eal_process_type() == RTE_PROC_PRIMARY){
send_ring = rte_ring_create(_PRI_2_SEC, ring_size, rte_socket_id(), flags);
recv_ring = rte_ring_create(_SEC_2_PRI, ring_size, rte_socket_id(), flags);
message_pool = rte_mempool_create(_MSG_POOL, pool_size,
STR_TOKEN_SIZE, pool_cache, priv_data_sz,
rte_socket_id(), flags);
} else {
recv_ring = rte_ring_lookup(_PRI_2_SEC);
send_ring = rte_ring_lookup(_SEC_2_PRI);
message_pool = rte_mempool_lookup(_MSG_POOL);
/* >8 End of ring structure. */
if (send_ring == NULL)
rte_exit(EXIT_FAILURE, "Problem getting sending ring\n");
if (recv_ring == NULL)
rte_exit(EXIT_FAILURE, "Problem getting receiving ring\n");
if (message_pool == NULL)
rte_exit(EXIT_FAILURE, "Problem getting message pool\n");
RTE_LOG(INFO, APP, "Finished Process Init.\n");
/* call lcore_recv() on every worker lcore */
rte_eal_remote_launch(lcore_recv, NULL, lcore_id);
/* call cmd prompt on main lcore */
struct cmdline *cl = cmdline_stdin_new(simple_mp_ctx, "\nsimple_mp > ");
if (cl == NULL)
rte_exit(EXIT_FAILURE, "Cannot create cmdline instance\n");
/* clean up the EAL */
return 0;