DPDK  20.11.3
examples/multi_process/client_server_mp/mp_client/client.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2016 Intel Corporation
*/
#include <stdint.h>
#include <stdio.h>
#include <inttypes.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/queue.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <rte_common.h>
#include <rte_malloc.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_eal.h>
#include <rte_atomic.h>
#include <rte_log.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_ring.h>
#include <rte_launch.h>
#include <rte_debug.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_interrupts.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_string_fns.h>
#include "common.h"
/* Number of packets to attempt to read from queue */
#define PKT_READ_SIZE ((uint16_t)32)
/* our client id number - tells us which rx queue to read, and NIC TX
* queue to write to. */
static uint8_t client_id = 0;
#define MBQ_CAPACITY 32
/* maps input ports to output ports for packets */
static uint16_t output_ports[RTE_MAX_ETHPORTS];
/* buffers up a set of packet that are ready to send */
struct rte_eth_dev_tx_buffer *tx_buffer[RTE_MAX_ETHPORTS];
/* shared data from server. We update statistics here */
static volatile struct tx_stats *tx_stats;
/*
* print a usage message
*/
static void
usage(const char *progname)
{
printf("Usage: %s [EAL args] -- -n <client_id>\n\n", progname);
}
/*
* Convert the client id number from a string to an int.
*/
static int
parse_client_num(const char *client)
{
char *end = NULL;
unsigned long temp;
if (client == NULL || *client == '\0')
return -1;
temp = strtoul(client, &end, 10);
if (end == NULL || *end != '\0')
return -1;
client_id = (uint8_t)temp;
return 0;
}
/*
* Parse the application arguments to the client app.
*/
static int
parse_app_args(int argc, char *argv[])
{
int option_index, opt;
char **argvopt = argv;
const char *progname = NULL;
static struct option lgopts[] = { /* no long options */
{NULL, 0, 0, 0 }
};
progname = argv[0];
while ((opt = getopt_long(argc, argvopt, "n:", lgopts,
&option_index)) != EOF){
switch (opt){
case 'n':
if (parse_client_num(optarg) != 0){
usage(progname);
return -1;
}
break;
default:
usage(progname);
return -1;
}
}
return 0;
}
/*
* Tx buffer error callback
*/
static void
flush_tx_error_callback(struct rte_mbuf **unsent, uint16_t count,
void *userdata) {
int i;
uint16_t port_id = (uintptr_t)userdata;
tx_stats->tx_drop[port_id] += count;
/* free the mbufs which failed from transmit */
for (i = 0; i < count; i++)
rte_pktmbuf_free(unsent[i]);
}
static void
configure_tx_buffer(uint16_t port_id, uint16_t size)
{
int ret;
/* Initialize TX buffers */
tx_buffer[port_id] = rte_zmalloc_socket("tx_buffer",
if (tx_buffer[port_id] == NULL)
rte_exit(EXIT_FAILURE, "Cannot allocate buffer for tx on port %u\n",
port_id);
rte_eth_tx_buffer_init(tx_buffer[port_id], size);
ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[port_id],
flush_tx_error_callback, (void *)(intptr_t)port_id);
if (ret < 0)
rte_exit(EXIT_FAILURE,
"Cannot set error callback for tx buffer on port %u\n",
port_id);
}
/*
* set up output ports so that all traffic on port gets sent out
* its paired port. Index using actual port numbers since that is
* what comes in the mbuf structure.
*/
static void
configure_output_ports(const struct port_info *ports)
{
int i;
if (ports->num_ports > RTE_MAX_ETHPORTS)
rte_exit(EXIT_FAILURE, "Too many ethernet ports. RTE_MAX_ETHPORTS = %u\n",
(unsigned)RTE_MAX_ETHPORTS);
for (i = 0; i < ports->num_ports - 1; i+=2){
uint16_t p1 = ports->id[i];
uint16_t p2 = ports->id[i+1];
output_ports[p1] = p2;
output_ports[p2] = p1;
configure_tx_buffer(p1, MBQ_CAPACITY);
configure_tx_buffer(p2, MBQ_CAPACITY);
}
}
/*
* This function performs routing of packets
* Just sends each input packet out an output port based solely on the input
* port it arrived on.
*/
static void
handle_packet(struct rte_mbuf *buf)
{
int sent;
const uint16_t in_port = buf->port;
const uint16_t out_port = output_ports[in_port];
struct rte_eth_dev_tx_buffer *buffer = tx_buffer[out_port];
sent = rte_eth_tx_buffer(out_port, client_id, buffer, buf);
if (sent)
tx_stats->tx[out_port] += sent;
}
/*
* Application main function - loops through
* receiving and processing packets. Never returns
*/
int
main(int argc, char *argv[])
{
const struct rte_memzone *mz;
struct rte_ring *rx_ring;
struct rte_mempool *mp;
struct port_info *ports;
int need_flush = 0; /* indicates whether we have unsent packets */
int retval;
void *pkts[PKT_READ_SIZE];
uint16_t sent;
if ((retval = rte_eal_init(argc, argv)) < 0)
return -1;
argc -= retval;
argv += retval;
if (parse_app_args(argc, argv) < 0)
rte_exit(EXIT_FAILURE, "Invalid command-line arguments\n");
rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
rx_ring = rte_ring_lookup(get_rx_queue_name(client_id));
if (rx_ring == NULL)
rte_exit(EXIT_FAILURE, "Cannot get RX ring - is server process running?\n");
mp = rte_mempool_lookup(PKTMBUF_POOL_NAME);
if (mp == NULL)
rte_exit(EXIT_FAILURE, "Cannot get mempool for mbufs\n");
mz = rte_memzone_lookup(MZ_PORT_INFO);
if (mz == NULL)
rte_exit(EXIT_FAILURE, "Cannot get port info structure\n");
ports = mz->addr;
tx_stats = &(ports->tx_stats[client_id]);
configure_output_ports(ports);
RTE_LOG(INFO, APP, "Finished Process Init.\n");
printf("\nClient process %d handling packets\n", client_id);
printf("[Press Ctrl-C to quit ...]\n");
for (;;) {
uint16_t i, rx_pkts;
rx_pkts = rte_ring_dequeue_burst(rx_ring, pkts,
PKT_READ_SIZE, NULL);
if (rx_pkts == 0 && need_flush) {
for (i = 0; i < ports->num_ports; i++) {
uint16_t port = ports->id[i];
client_id,
tx_buffer[port]);
tx_stats->tx[port] += sent;
}
need_flush = 0;
continue;
}
for (i = 0; i < rx_pkts; i++)
handle_packet(pkts[i]);
need_flush = 1;
}
/* clean up the EAL */
}