DPDK  19.11.10
examples/multi_process/symmetric_mp/main.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
/*
* Sample application demostrating how to do packet I/O in a multi-process
* environment. The same code can be run as a primary process and as a
* secondary process, just with a different proc-id parameter in each case
* (apart from the EAL flag to indicate a secondary process).
*
* Each process will read from the same ports, given by the port-mask
* parameter, which should be the same in each case, just using a different
* queue per port as determined by the proc-id parameter.
*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/queue.h>
#include <getopt.h>
#include <signal.h>
#include <inttypes.h>
#include <rte_common.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_atomic.h>
#include <rte_debug.h>
#include <rte_interrupts.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_memcpy.h>
#include <rte_mbuf.h>
#include <rte_string_fns.h>
#include <rte_cycles.h>
#define RTE_LOGTYPE_APP RTE_LOGTYPE_USER1
#define NB_MBUFS 64*1024 /* use 64k mbufs */
#define MBUF_CACHE_SIZE 256
#define PKT_BURST 32
#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024
#define PARAM_PROC_ID "proc-id"
#define PARAM_NUM_PROCS "num-procs"
/* for each lcore, record the elements of the ports array to use */
struct lcore_ports{
unsigned start_port;
unsigned num_ports;
};
/* structure to record the rx and tx packets. Put two per cache line as ports
* used in pairs */
struct port_stats{
unsigned rx;
unsigned tx;
unsigned drop;
} __attribute__((aligned(RTE_CACHE_LINE_SIZE / 2)));
static int proc_id = -1;
static unsigned num_procs = 0;
static uint16_t ports[RTE_MAX_ETHPORTS];
static unsigned num_ports = 0;
static struct lcore_ports lcore_ports[RTE_MAX_LCORE];
static struct port_stats pstats[RTE_MAX_ETHPORTS];
/* prints the usage statement and quits with an error message */
static void
smp_usage(const char *prgname, const char *errmsg)
{
printf("\nError: %s\n",errmsg);
printf("\n%s [EAL options] -- -p <port mask> "
"--"PARAM_NUM_PROCS" <n>"
" --"PARAM_PROC_ID" <id>\n"
"-p : a hex bitmask indicating what ports are to be used\n"
"--num-procs: the number of processes which will be used\n"
"--proc-id : the id of the current process (id < num-procs)\n"
"\n",
prgname);
exit(1);
}
/* signal handler configured for SIGTERM and SIGINT to print stats on exit */
static void
print_stats(int signum)
{
unsigned i;
printf("\nExiting on signal %d\n\n", signum);
for (i = 0; i < num_ports; i++){
const uint8_t p_num = ports[i];
printf("Port %u: RX - %u, TX - %u, Drop - %u\n", (unsigned)p_num,
pstats[p_num].rx, pstats[p_num].tx, pstats[p_num].drop);
}
exit(0);
}
/* Parse the argument given in the command line of the application */
static int
smp_parse_args(int argc, char **argv)
{
int opt, ret;
char **argvopt;
int option_index;
uint16_t i, port_mask = 0;
char *prgname = argv[0];
static struct option lgopts[] = {
{PARAM_NUM_PROCS, 1, 0, 0},
{PARAM_PROC_ID, 1, 0, 0},
{NULL, 0, 0, 0}
};
argvopt = argv;
while ((opt = getopt_long(argc, argvopt, "p:", \
lgopts, &option_index)) != EOF) {
switch (opt) {
case 'p':
port_mask = strtoull(optarg, NULL, 16);
break;
/* long options */
case 0:
if (strncmp(lgopts[option_index].name, PARAM_NUM_PROCS, 8) == 0)
num_procs = atoi(optarg);
else if (strncmp(lgopts[option_index].name, PARAM_PROC_ID, 7) == 0)
proc_id = atoi(optarg);
break;
default:
smp_usage(prgname, "Cannot parse all command-line arguments\n");
}
}
if (optind >= 0)
argv[optind-1] = prgname;
if (proc_id < 0)
smp_usage(prgname, "Invalid or missing proc-id parameter\n");
if (rte_eal_process_type() == RTE_PROC_PRIMARY && num_procs == 0)
smp_usage(prgname, "Invalid or missing num-procs parameter\n");
if (port_mask == 0)
smp_usage(prgname, "Invalid or missing port mask\n");
/* get the port numbers from the port mask */
if(port_mask & (1 << i))
ports[num_ports++] = (uint8_t)i;
ret = optind-1;
optind = 1; /* reset getopt lib */
return ret;
}
/*
* Initialises a given port using global settings and with the rx buffers
* coming from the mbuf_pool passed as parameter
*/
static inline int
smp_port_init(uint16_t port, struct rte_mempool *mbuf_pool,
uint16_t num_queues)
{
struct rte_eth_conf port_conf = {
.rxmode = {
.split_hdr_size = 0,
.offloads = DEV_RX_OFFLOAD_CHECKSUM,
},
.rx_adv_conf = {
.rss_conf = {
.rss_key = NULL,
.rss_hf = ETH_RSS_IP,
},
},
.txmode = {
.mq_mode = ETH_MQ_TX_NONE,
}
};
const uint16_t rx_rings = num_queues, tx_rings = num_queues;
struct rte_eth_dev_info info;
struct rte_eth_rxconf rxq_conf;
struct rte_eth_txconf txq_conf;
int retval;
uint16_t q;
uint16_t nb_rxd = RX_RING_SIZE;
uint16_t nb_txd = TX_RING_SIZE;
uint64_t rss_hf_tmp;
if (rte_eal_process_type() == RTE_PROC_SECONDARY)
return 0;
return -1;
printf("# Initialising port %u... ", port);
fflush(stdout);
retval = rte_eth_dev_info_get(port, &info);
if (retval != 0) {
printf("Error during getting device (port %u) info: %s\n",
port, strerror(-retval));
return retval;
}
port_conf.txmode.offloads |=
rss_hf_tmp = port_conf.rx_adv_conf.rss_conf.rss_hf;
if (port_conf.rx_adv_conf.rss_conf.rss_hf != rss_hf_tmp) {
printf("Port %u modified RSS hash function based on hardware support,"
"requested:%#"PRIx64" configured:%#"PRIx64"\n",
port,
rss_hf_tmp,
}
retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
if (retval < 0)
return retval;
retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
if (retval < 0)
return retval;
rxq_conf = info.default_rxconf;
rxq_conf.offloads = port_conf.rxmode.offloads;
for (q = 0; q < rx_rings; q ++) {
retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
&rxq_conf,
mbuf_pool);
if (retval < 0)
return retval;
}
txq_conf = info.default_txconf;
txq_conf.offloads = port_conf.txmode.offloads;
for (q = 0; q < tx_rings; q ++) {
retval = rte_eth_tx_queue_setup(port, q, nb_txd,
&txq_conf);
if (retval < 0)
return retval;
}
if (retval != 0)
return retval;
retval = rte_eth_dev_start(port);
if (retval < 0)
return retval;
return 0;
}
/* Goes through each of the lcores and calculates what ports should
* be used by that core. Fills in the global lcore_ports[] array.
*/
static void
assign_ports_to_cores(void)
{
const unsigned int lcores = rte_lcore_count();
const unsigned port_pairs = num_ports / 2;
const unsigned pairs_per_lcore = port_pairs / lcores;
unsigned extra_pairs = port_pairs % lcores;
unsigned ports_assigned = 0;
unsigned i;
lcore_ports[i].start_port = ports_assigned;
lcore_ports[i].num_ports = pairs_per_lcore * 2;
if (extra_pairs > 0) {
lcore_ports[i].num_ports += 2;
extra_pairs--;
}
ports_assigned += lcore_ports[i].num_ports;
}
}
/* Main function used by the processing threads.
* Prints out some configuration details for the thread and then begins
* performing packet RX and TX.
*/
static int
lcore_main(void *arg __rte_unused)
{
const unsigned id = rte_lcore_id();
const unsigned start_port = lcore_ports[id].start_port;
const unsigned end_port = start_port + lcore_ports[id].num_ports;
const uint16_t q_id = (uint16_t)proc_id;
unsigned p, i;
char msgbuf[256];
int msgbufpos = 0;
if (start_port == end_port){
printf("Lcore %u has nothing to do\n", id);
return 0;
}
/* build up message in msgbuf before printing to decrease likelihood
* of multi-core message interleaving.
*/
msgbufpos += snprintf(msgbuf, sizeof(msgbuf) - msgbufpos,
"Lcore %u using ports ", id);
for (p = start_port; p < end_port; p++){
msgbufpos += snprintf(msgbuf + msgbufpos, sizeof(msgbuf) - msgbufpos,
"%u ", (unsigned)ports[p]);
}
printf("%s\n", msgbuf);
printf("lcore %u using queue %u of each port\n", id, (unsigned)q_id);
/* handle packet I/O from the ports, reading and writing to the
* queue number corresponding to our process number (not lcore id)
*/
for (;;) {
struct rte_mbuf *buf[PKT_BURST];
for (p = start_port; p < end_port; p++) {
const uint8_t src = ports[p];
const uint8_t dst = ports[p ^ 1]; /* 0 <-> 1, 2 <-> 3 etc */
const uint16_t rx_c = rte_eth_rx_burst(src, q_id, buf, PKT_BURST);
if (rx_c == 0)
continue;
pstats[src].rx += rx_c;
const uint16_t tx_c = rte_eth_tx_burst(dst, q_id, buf, rx_c);
pstats[dst].tx += tx_c;
if (tx_c != rx_c) {
pstats[dst].drop += (rx_c - tx_c);
for (i = tx_c; i < rx_c; i++)
}
}
}
}
/* Check the link status of all ports in up to 9s, and print them finally */
static void
check_all_ports_link_status(uint16_t port_num, uint32_t port_mask)
{
#define CHECK_INTERVAL 100 /* 100ms */
#define MAX_CHECK_TIME 90 /* 9s (90 * 100ms) in total */
uint16_t portid;
uint8_t count, all_ports_up, print_flag = 0;
struct rte_eth_link link;
int ret;
printf("\nChecking link status");
fflush(stdout);
for (count = 0; count <= MAX_CHECK_TIME; count++) {
all_ports_up = 1;
for (portid = 0; portid < port_num; portid++) {
if ((port_mask & (1 << portid)) == 0)
continue;
memset(&link, 0, sizeof(link));
ret = rte_eth_link_get_nowait(portid, &link);
if (ret < 0) {
all_ports_up = 0;
if (print_flag == 1)
printf("Port %u link get failed: %s\n",
portid, rte_strerror(-ret));
continue;
}
/* print link status if flag set */
if (print_flag == 1) {
if (link.link_status)
printf(
"Port%d Link Up. Speed %u Mbps - %s\n",
portid, link.link_speed,
("full-duplex") : ("half-duplex"));
else
printf("Port %d Link Down\n", portid);
continue;
}
/* clear all_ports_up flag if any link down */
if (link.link_status == ETH_LINK_DOWN) {
all_ports_up = 0;
break;
}
}
/* after finally printing all link status, get out */
if (print_flag == 1)
break;
if (all_ports_up == 0) {
printf(".");
fflush(stdout);
rte_delay_ms(CHECK_INTERVAL);
}
/* set the print_flag if all ports up or timeout */
if (all_ports_up == 1 || count == (MAX_CHECK_TIME - 1)) {
print_flag = 1;
printf("done\n");
}
}
}
/* Main function.
* Performs initialisation and then calls the lcore_main on each core
* to do the packet-processing work.
*/
int
main(int argc, char **argv)
{
static const char *_SMP_MBUF_POOL = "SMP_MBUF_POOL";
int ret;
unsigned i;
enum rte_proc_type_t proc_type;
struct rte_mempool *mp;
/* set up signal handlers to print stats on exit */
signal(SIGINT, print_stats);
signal(SIGTERM, print_stats);
/* initialise the EAL for all */
ret = rte_eal_init(argc, argv);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Cannot init EAL\n");
argc -= ret;
argv += ret;
/* determine the NIC devices available */
rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
/* parse application arguments (those after the EAL ones) */
smp_parse_args(argc, argv);
proc_type = rte_eal_process_type();
mp = (proc_type == RTE_PROC_SECONDARY) ?
rte_mempool_lookup(_SMP_MBUF_POOL) :
rte_pktmbuf_pool_create(_SMP_MBUF_POOL, NB_MBUFS,
MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
if (mp == NULL)
rte_exit(EXIT_FAILURE, "Cannot get memory pool for buffers\n");
if (num_ports & 1)
rte_exit(EXIT_FAILURE, "Application must use an even number of ports\n");
for(i = 0; i < num_ports; i++){
if(proc_type == RTE_PROC_PRIMARY)
if (smp_port_init(ports[i], mp, (uint16_t)num_procs) < 0)
rte_exit(EXIT_FAILURE, "Error initialising ports\n");
}
if (proc_type == RTE_PROC_PRIMARY)
check_all_ports_link_status((uint8_t)num_ports, (~0x0));
assign_ports_to_cores();
RTE_LOG(INFO, APP, "Finished Process Init.\n");
/* clean up the EAL */
return 0;
}