examples/server_node_efd/server/main.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016-2017 Intel Corporation
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <stdarg.h>
#include <inttypes.h>
#include <sys/queue.h>
#include <errno.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip.h>

#include <rte_common.h>
#include <rte_memory.h>
#include <rte_eal.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_ethdev.h>
#include <rte_byteorder.h>
#include <rte_malloc.h>
#include <rte_string_fns.h>
#include <rte_efd.h>
#include <rte_ip.h>

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

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

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

struct efd_stats {
    uint64_t distributed;
    uint64_t drop;
} flow_dist_stats;

/* One buffer per node rx queue - dynamically allocate array */
static struct node_rx_buf *cl_rx_buf;

static const char *
get_printable_mac_addr(uint16_t port)
{
    static const char err_address[] = "00:00:00:00:00:00";
    static char addresses[RTE_MAX_ETHPORTS][sizeof(err_address)];
    struct rte_ether_addr mac;
    int ret;

    if (unlikely(port >= RTE_MAX_ETHPORTS))
        return err_address;
    if (unlikely(addresses[port][0] == '\0')) {
        ret = rte_eth_macaddr_get(port, &mac);
        if (ret != 0) {
            printf("Failed to get MAC address (port %u): %s\n",
                   port, rte_strerror(-ret));
            return err_address;
        }

        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 node. 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 int 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 node_tx[MAX_NODES], node_tx_drop[MAX_NODES];

    /* 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(node_tx, 0, sizeof(node_tx));
    memset(node_tx_drop, 0, sizeof(node_tx_drop));

    for (i = 0; i < num_nodes; i++) {
        const struct tx_stats *tx = &info->tx_stats[i];

        for (j = 0; j < info->num_ports; j++) {
            const uint64_t tx_val = tx->tx[info->id[j]];
            const uint64_t drop_val = tx->tx_drop[info->id[j]];

            port_tx[j] += tx_val;
            port_tx_drop[j] += drop_val;
            node_tx[i] += tx_val;
            node_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 < info->num_ports; i++)
        printf("Port %u: '%s'\t", (unsigned int)info->id[i],
                get_printable_mac_addr(info->id[i]));
    printf("\n\n");
    for (i = 0; i < info->num_ports; i++) {
        printf("Port %u - rx: %9"PRIu64"\t"
                "tx: %9"PRIu64"\n",
                (unsigned int)info->id[i], info->rx_stats.rx[i],
                port_tx[i]);
    }

    printf("\nSERVER\n");
    printf("-----\n");
    printf("distributed: %9"PRIu64", drop: %9"PRIu64"\n",
            flow_dist_stats.distributed, flow_dist_stats.drop);

    printf("\nNODES\n");
    printf("-------\n");
    for (i = 0; i < num_nodes; i++) {
        const unsigned long long rx = nodes[i].stats.rx;
        const unsigned long long rx_drop = nodes[i].stats.rx_drop;
        const struct filter_stats *filter = &info->filter_stats[i];

        printf("Node %2u - rx: %9llu, rx_drop: %9llu\n"
                "            tx: %9"PRIu64", tx_drop: %9"PRIu64"\n"
                "            filter_passed: %9"PRIu64", "
                "filter_drop: %9"PRIu64"\n",
                i, rx, rx_drop, node_tx[i], node_tx_drop[i],
                filter->passed, filter->drop);
    }

    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(__rte_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 int 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 node statistic values to zero.
 * Called at program startup.
 */
static void
clear_stats(void)
{
    unsigned int i;

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

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

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

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

    cl_rx_buf[node].count = 0;
}

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

/*
 * This function takes a group of packets and routes them
 * individually to the node 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, unsigned int socket_id)
{
    uint16_t i;
    uint8_t node;
    efd_value_t data[RTE_EFD_BURST_MAX];
    const void *key_ptrs[RTE_EFD_BURST_MAX];

    struct rte_ipv4_hdr *ipv4_hdr;
    uint32_t ipv4_dst_ip[RTE_EFD_BURST_MAX];

    for (i = 0; i < rx_count; i++) {
        /* Handle IPv4 header.*/
        ipv4_hdr = rte_pktmbuf_mtod_offset(pkts[i],
            struct rte_ipv4_hdr *, sizeof(struct rte_ether_hdr));
        ipv4_dst_ip[i] = ipv4_hdr->dst_addr;
        key_ptrs[i] = (void *)&ipv4_dst_ip[i];
    }

    rte_efd_lookup_bulk(efd_table, socket_id, rx_count,
                (const void **) key_ptrs, data);
    for (i = 0; i < rx_count; i++) {
        node = (uint8_t) ((uintptr_t)data[i]);

        if (node >= num_nodes) {
            /*
             * Node is out of range, which means that
             * flow has not been inserted
             */
            flow_dist_stats.drop++;
            rte_pktmbuf_free(pkts[i]);
        } else {
            flow_dist_stats.distributed++;
            enqueue_rx_packet(node, pkts[i]);
        }
    }

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

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

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

        /* read a port */
        rx_count = rte_eth_rx_burst(info->id[port_num], 0,
                buf, PACKET_READ_SIZE);
        info->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, socket_id);

        /* move to next port */
        if (++port_num == info->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_nodes, 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;
}