examples/multi_process/client_server_mp/mp_server/main.c

/*-
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 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <stdarg.h>
#include <inttypes.h>
#include <inttypes.h>
#include <sys/queue.h>
#include <errno.h>
#include <netinet/ip.h>

#include <rte_common.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_eal.h>
#include <rte_byteorder.h>
#include <rte_launch.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_branch_prediction.h>
#include <rte_atomic.h>
#include <rte_ring.h>
#include <rte_log.h>
#include <rte_debug.h>
#include <rte_mempool.h>
#include <rte_memcpy.h>
#include <rte_mbuf.h>
#include <rte_ether.h>
#include <rte_interrupts.h>
#include <rte_pci.h>
#include <rte_ethdev.h>
#include <rte_byteorder.h>
#include <rte_malloc.h>
#include <rte_string_fns.h>

#include "common.h"
#include "args.h"
#include "init.h"

/*
 * When doing reads from the NIC or the client queues,
 * use this batch size
 */
#define PACKET_READ_SIZE 32

/*
 * Local buffers to put packets in, used to send packets in bursts to the
 * clients
 */
struct client_rx_buf {
        struct rte_mbuf *buffer[PACKET_READ_SIZE];
        uint16_t count;
};

/* One buffer per client rx queue - dynamically allocate array */
static struct client_rx_buf *cl_rx_buf;

static const char *
get_printable_mac_addr(uint8_t port)
{
        static const char err_address[] = "00:00:00:00:00:00";
        static char addresses[RTE_MAX_ETHPORTS][sizeof(err_address)];

        if (unlikely(port >= RTE_MAX_ETHPORTS))
                return err_address;
        if (unlikely(addresses[port][0]=='\0')){
                struct ether_addr mac;
                rte_eth_macaddr_get(port, &mac);
                snprintf(addresses[port], sizeof(addresses[port]),
                                "%02x:%02x:%02x:%02x:%02x:%02x\n",
                                mac.addr_bytes[0], mac.addr_bytes[1], mac.addr_bytes[2],
                                mac.addr_bytes[3], mac.addr_bytes[4], mac.addr_bytes[5]);
        }
        return addresses[port];
}

/*
 * This function displays the recorded statistics for each port
 * and for each client. It uses ANSI terminal codes to clear
 * screen when called. It is called from a single non-master
 * thread in the server process, when the process is run with more
 * than one lcore enabled.
 */
static void
do_stats_display(void)
{
        unsigned i, j;
        const char clr[] = { 27, '[', '2', 'J', '\0' };
        const char topLeft[] = { 27, '[', '1', ';', '1', 'H','\0' };
        uint64_t port_tx[RTE_MAX_ETHPORTS], port_tx_drop[RTE_MAX_ETHPORTS];
        uint64_t client_tx[MAX_CLIENTS], client_tx_drop[MAX_CLIENTS];

        /* to get TX stats, we need to do some summing calculations */
        memset(port_tx, 0, sizeof(port_tx));
        memset(port_tx_drop, 0, sizeof(port_tx_drop));
        memset(client_tx, 0, sizeof(client_tx));
        memset(client_tx_drop, 0, sizeof(client_tx_drop));

        for (i = 0; i < num_clients; i++){
                const volatile struct tx_stats *tx = &ports->tx_stats[i];
                for (j = 0; j < ports->num_ports; j++){
                        /* assign to local variables here, save re-reading volatile vars */
                        const uint64_t tx_val = tx->tx[ports->id[j]];
                        const uint64_t drop_val = tx->tx_drop[ports->id[j]];
                        port_tx[j] += tx_val;
                        port_tx_drop[j] += drop_val;
                        client_tx[i] += tx_val;
                        client_tx_drop[i] += drop_val;
                }
        }

        /* Clear screen and move to top left */
        printf("%s%s", clr, topLeft);

        printf("PORTS\n");
        printf("-----\n");
        for (i = 0; i < ports->num_ports; i++)
                printf("Port %u: '%s'\t", (unsigned)ports->id[i],
                                get_printable_mac_addr(ports->id[i]));
        printf("\n\n");
        for (i = 0; i < ports->num_ports; i++){
                printf("Port %u - rx: %9"PRIu64"\t"
                                "tx: %9"PRIu64"\n",
                                (unsigned)ports->id[i], ports->rx_stats.rx[i],
                                port_tx[i]);
        }

        printf("\nCLIENTS\n");
        printf("-------\n");
        for (i = 0; i < num_clients; i++){
                const unsigned long long rx = clients[i].stats.rx;
                const unsigned long long rx_drop = clients[i].stats.rx_drop;
                printf("Client %2u - rx: %9llu, rx_drop: %9llu\n"
                                "            tx: %9"PRIu64", tx_drop: %9"PRIu64"\n",
                                i, rx, rx_drop, client_tx[i], client_tx_drop[i]);
        }

        printf("\n");
}

/*
 * The function called from each non-master lcore used by the process.
 * The test_and_set function is used to randomly pick a single lcore on which
 * the code to display the statistics will run. Otherwise, the code just
 * repeatedly sleeps.
 */
static int
sleep_lcore(__attribute__((unused)) void *dummy)
{
        /* Used to pick a display thread - static, so zero-initialised */
        static rte_atomic32_t display_stats;

        /* Only one core should display stats */
        if (rte_atomic32_test_and_set(&display_stats)) {
                const unsigned sleeptime = 1;
                printf("Core %u displaying statistics\n", rte_lcore_id());

                /* Longer initial pause so above printf is seen */
                sleep(sleeptime * 3);

                /* Loop forever: sleep always returns 0 or <= param */
                while (sleep(sleeptime) <= sleeptime)
                        do_stats_display();
        }
        return 0;
}

/*
 * Function to set all the client statistic values to zero.
 * Called at program startup.
 */
static void
clear_stats(void)
{
        unsigned i;

        for (i = 0; i < num_clients; i++)
                clients[i].stats.rx = clients[i].stats.rx_drop = 0;
}

/*
 * send a burst of traffic to a client, assuming there are packets
 * available to be sent to this client
 */
static void
flush_rx_queue(uint16_t client)
{
        uint16_t j;
        struct client *cl;

        if (cl_rx_buf[client].count == 0)
                return;

        cl = &clients[client];
        if (rte_ring_enqueue_bulk(cl->rx_q, (void **)cl_rx_buf[client].buffer,
                        cl_rx_buf[client].count, NULL) == 0){
                for (j = 0; j < cl_rx_buf[client].count; j++)
                        rte_pktmbuf_free(cl_rx_buf[client].buffer[j]);
                cl->stats.rx_drop += cl_rx_buf[client].count;
        }
        else
                cl->stats.rx += cl_rx_buf[client].count;

        cl_rx_buf[client].count = 0;
}

/*
 * marks a packet down to be sent to a particular client process
 */
static inline void
enqueue_rx_packet(uint8_t client, struct rte_mbuf *buf)
{
        cl_rx_buf[client].buffer[cl_rx_buf[client].count++] = buf;
}

/*
 * This function takes a group of packets and routes them
 * individually to the client process. Very simply round-robins the packets
 * without checking any of the packet contents.
 */
static void
process_packets(uint32_t port_num __rte_unused,
                struct rte_mbuf *pkts[], uint16_t rx_count)
{
        uint16_t i;
        uint8_t client = 0;

        for (i = 0; i < rx_count; i++) {
                enqueue_rx_packet(client, pkts[i]);

                if (++client == num_clients)
                        client = 0;
        }

        for (i = 0; i < num_clients; i++)
                flush_rx_queue(i);
}

/*
 * Function called by the master lcore of the DPDK process.
 */
static void
do_packet_forwarding(void)
{
        unsigned port_num = 0; /* indexes the port[] array */

        for (;;) {
                struct rte_mbuf *buf[PACKET_READ_SIZE];
                uint16_t rx_count;

                /* read a port */
                rx_count = rte_eth_rx_burst(ports->id[port_num], 0, \
                                buf, PACKET_READ_SIZE);
                ports->rx_stats.rx[port_num] += rx_count;

                /* Now process the NIC packets read */
                if (likely(rx_count > 0))
                        process_packets(port_num, buf, rx_count);

                /* move to next port */
                if (++port_num == ports->num_ports)
                        port_num = 0;
        }
}

int
main(int argc, char *argv[])
{
        /* initialise the system */
        if (init(argc, argv) < 0 )
                return -1;
        RTE_LOG(INFO, APP, "Finished Process Init.\n");

        cl_rx_buf = calloc(num_clients, sizeof(cl_rx_buf[0]));

        /* clear statistics */
        clear_stats();

        /* put all other cores to sleep bar master */
        rte_eal_mp_remote_launch(sleep_lcore, NULL, SKIP_MASTER);

        do_packet_forwarding();
        return 0;
}