[dpdk-users] Not able to receive packet via api rte_eth_rx_burst

Avinash Chaurasia avinash.aviank2003 at gmail.com
Wed Oct 31 16:06:45 CET 2018


I have modified rxtx_callback example to just receive on single port.
However it is not working rte_eth_stats_get() shows packets are present in
ethernet ring via the field ipackets but rte_eth_rx_burst is not returning
any packets. Code is included here, please let me know what I am doing
wrong.
//* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2015 Intel Corporation
 */

#include <stdint.h>
#include <inttypes.h>
#include <rte_eal.h>
#include <rte_ethdev.h>
#include <rte_ether.h>
#include <rte_cycles.h>
#include <rte_lcore.h>
#include <rte_ip.h>
#include <rte_mbuf.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <signal.h>
#define MAX_SOURCE_SIZE (0x100000)

#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024

#define NUM_MBUFS 8191
#define MBUF_CACHE_SIZE 250
#define BURST_SIZE 32

static const struct rte_eth_conf port_conf_default = {
.rxmode = {
.max_rx_pkt_len = ETHER_MAX_LEN,
},
};

static struct {
uint64_t total_cycles;
uint64_t total_pkts;
} latency_numbers;

static volatile bool force_quit;
struct rte_mempool *mbuf_pool;
static void
signal_handler(int signum)
{
struct rte_eth_stats eth_stats;
int i;
        if (signum == SIGINT || signum == SIGTERM) {
                printf("\n\nSignal %d received, preparing to exit...\n",
                                signum);
RTE_ETH_FOREACH_DEV(i) {
                rte_eth_stats_get(i, &eth_stats);
printf("Total number of packets received %llu, dropped rx full %llu and
rest= %llu, %llu, %llu\n", eth_stats.ipackets, eth_stats.imissed,
eth_stats.ierrors, eth_stats.rx_nombuf, eth_stats.q_ipackets[0]);
        }
                force_quit = true;
        }
}
struct ether_addr addr;

/*
 * Initialises a given port using global settings and with the rx buffers
 * coming from the mbuf_pool passed as parameter
 */
static inline int
port_init(uint16_t port, struct rte_mempool *mbuf_pool)
{
struct rte_eth_conf port_conf = port_conf_default;
const uint16_t rx_rings = 1, tx_rings = 1;
uint16_t nb_rxd = RX_RING_SIZE;
uint16_t nb_txd = TX_RING_SIZE;
int retval;
uint16_t q;
struct rte_eth_dev_info dev_info;
struct rte_eth_txconf txconf;

if (!rte_eth_dev_is_valid_port(port))
return -1;

rte_eth_dev_info_get(port, &dev_info);
if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
port_conf.txmode.offloads |=
DEV_TX_OFFLOAD_MBUF_FAST_FREE;

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) {
printf("Error in adjustment\n");
return retval;
}

for (q = 0; q < rx_rings; q++) {
retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
rte_eth_dev_socket_id(port), NULL, mbuf_pool);
if (retval < 0) {
printf("RX queue setup prob\n");
return retval;
}
}

txconf = dev_info.default_txconf;
txconf.offloads = port_conf.txmode.offloads;
for (q = 0; q < tx_rings; q++) {
retval = rte_eth_tx_queue_setup(port, q, nb_txd,
rte_eth_dev_socket_id(port), &txconf);
if (retval < 0)
return retval;
}
retval  = rte_eth_dev_start(port);
if (retval < 0) {
printf("Error in start\n");
return retval;
}


rte_eth_macaddr_get(port, &addr);
printf("Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
" %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
(unsigned)port,
addr.addr_bytes[0], addr.addr_bytes[1],
addr.addr_bytes[2], addr.addr_bytes[3],
addr.addr_bytes[4], addr.addr_bytes[5]);

rte_eth_promiscuous_enable(port);

return 0;
}


/*
 * Main thread that does the work, reading from INPUT_PORT
 * and writing to OUTPUT_PORT
 */
static  __attribute__((noreturn)) void
lcore_main(void)
{
uint16_t port;
struct ether_hdr *eth_hdr;
//struct ether_addr addr;

//rte_eth_macaddr_get(portid, &addr);
struct ipv4_hdr *ipv4_hdr;
int32_t i;
RTE_ETH_FOREACH_DEV(port)
{
if (rte_eth_dev_socket_id(port) > 0 &&
rte_eth_dev_socket_id(port) !=
(int)rte_socket_id())
printf("WARNING, port %u is on remote NUMA node to "
"polling thread.\n\tPerformance will "
"not be optimal.\n", port);
}
printf("\nCore %u forwarding packets.  [Ctrl+C to quit]\n",
rte_lcore_id());

for (;;) {
RTE_ETH_FOREACH_DEV(port) {
struct rte_mbuf *bufs[BURST_SIZE];
const uint16_t nb_rx = rte_eth_rx_burst(port, 0,bufs, BURST_SIZE);
for(i  = 0; i < nb_rx; i++) {
ipv4_hdr = rte_pktmbuf_mtod_offset(bufs[i], struct ipv4_hdr *,
sizeof(struct ether_hdr));
printf("Packet ip received %d\n", ipv4_hdr->src_addr);
}

if (unlikely(nb_rx == 0))
continue;
const uint16_t nb_tx = 0; // = rte_eth_tx_burst(port ^ 1, 0, bufs, nb_rx);
if (unlikely(nb_tx < nb_rx)) {
uint16_t buf;

for (buf = nb_tx; buf < nb_rx; buf++)
rte_pktmbuf_free(bufs[buf]);
}
}
if(force_quit)
break;
}
}

/* Main function, does initialisation and calls the per-lcore functions */
int
main(int argc, char *argv[])
{
uint16_t nb_ports;
uint16_t portid, port;

/* init EAL */
int ret = rte_eal_init(argc, argv);

if (ret < 0)
rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
argc -= ret;
argv += ret;
force_quit = false;
        signal(SIGINT, signal_handler);
        signal(SIGTERM, signal_handler);
nb_ports = rte_eth_dev_count_avail();
printf("size ordered %lld\n", NUM_MBUFS *nb_ports);
mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL",
NUM_MBUFS * nb_ports, MBUF_CACHE_SIZE, 0,
RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
if (nb_ports < 1)
rte_exit(EXIT_FAILURE, "Error: number of ports must be greater than %d\n",
nb_ports);

if (mbuf_pool == NULL)
rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");

// initialize all ports
RTE_ETH_FOREACH_DEV(portid)
if (port_init(portid, mbuf_pool) != 0)
rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu8"\n",
portid);
if (rte_lcore_count() > 1)
printf("\nWARNING: Too much enabled lcores - "
"App uses only 1 lcore\n");

// call lcore_main on master core only
lcore_main();
return 0;
}
Thanks
Avinash Kumar Chaurasia


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