examples/netmap_compat/bridge/bridge.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#include <fcntl.h>
#include <getopt.h>
#include <inttypes.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>

#include <rte_eal.h>
#include <rte_ethdev.h>
#include <rte_mbuf.h>
#include <rte_mempool.h>
#include <rte_string_fns.h>
#include "compat_netmap.h"


#define BUF_SIZE    RTE_MBUF_DEFAULT_DATAROOM
#define MBUF_DATA_SIZE  (BUF_SIZE + RTE_PKTMBUF_HEADROOM)

#define MBUF_PER_POOL   8192

struct rte_eth_conf eth_conf = {
    .rxmode = {
        .split_hdr_size = 0,
    },
    .txmode = {
        .mq_mode = ETH_MQ_TX_NONE,
    },
};

#define MAX_QUEUE_NUM   1
#define RX_QUEUE_NUM    1
#define TX_QUEUE_NUM    1

#define MAX_DESC_NUM    0x400
#define RX_DESC_NUM 0x100
#define TX_DESC_NUM 0x200

#define RX_SYNC_NUM 0x20
#define TX_SYNC_NUM 0x20

struct rte_netmap_port_conf port_conf = {
    .eth_conf = &eth_conf,
    .socket_id = SOCKET_ID_ANY,
    .nr_tx_rings = TX_QUEUE_NUM,
    .nr_rx_rings = RX_QUEUE_NUM,
    .nr_tx_slots = TX_DESC_NUM,
    .nr_rx_slots = RX_DESC_NUM,
    .tx_burst = TX_SYNC_NUM,
    .rx_burst = RX_SYNC_NUM,
};

struct rte_netmap_conf netmap_conf = {
    .socket_id = SOCKET_ID_ANY,
    .max_bufsz = BUF_SIZE,
    .max_rings = MAX_QUEUE_NUM,
    .max_slots = MAX_DESC_NUM,
};

static int stop = 0;

#define MAX_PORT_NUM    2

struct netmap_port {
    int fd;
    struct netmap_if *nmif;
    struct netmap_ring *rx_ring;
    struct netmap_ring *tx_ring;
    const char *str;
    uint8_t id;
};

static struct {
    uint32_t num;
    struct netmap_port p[MAX_PORT_NUM];
    void *mem;
} ports;

static void
usage(const char *prgname)
{
    fprintf(stderr, "Usage: %s [EAL args] -- [OPTION]...\n"
        "-h, --help   \t Show this help message and exit\n"
        "-i INTERFACE_A   \t Interface (DPDK port number) to use\n"
        "[ -i INTERFACE_B   \t Interface (DPDK port number) to use ]\n",
        prgname);
}

static uint8_t
parse_portid(const char *portid_str)
{
    char *end;
    unsigned id;

    id = strtoul(portid_str, &end, 10);

    if (end == portid_str || *end != '\0' || id > RTE_MAX_ETHPORTS)
        rte_exit(EXIT_FAILURE, "Invalid port number\n");

    return (uint8_t) id;
}

static int
parse_args(int argc, char **argv)
{
    int opt;

    while ((opt = getopt(argc, argv, "hi:")) != -1) {
        switch (opt) {
        case 'h':
            usage(argv[0]);
            rte_exit(EXIT_SUCCESS, "exiting...");
            break;
        case 'i':
            if (ports.num >= RTE_DIM(ports.p)) {
                usage(argv[0]);
                rte_exit(EXIT_FAILURE, "configs with %u "
                    "ports are not supported\n",
                    ports.num + 1);

            }

            ports.p[ports.num].str = optarg;
            ports.p[ports.num].id = parse_portid(optarg);
            ports.num++;
            break;
        default:
            usage(argv[0]);
            rte_exit(EXIT_FAILURE, "invalid option: %c\n", opt);
        }
    }

    return 0;
}

static void sigint_handler(__rte_unused int sig)
{
    stop = 1;
    signal(SIGINT, SIG_DFL);
}

static void move(int n, struct netmap_ring *rx, struct netmap_ring *tx)
{
    uint32_t tmp;

    while (n-- > 0) {
        tmp = tx->slot[tx->cur].buf_idx;

        tx->slot[tx->cur].buf_idx = rx->slot[rx->cur].buf_idx;
        tx->slot[tx->cur].len     = rx->slot[rx->cur].len;
        tx->slot[tx->cur].flags  |= NS_BUF_CHANGED;
        tx->cur = NETMAP_RING_NEXT(tx, tx->cur);
        tx->avail--;

        rx->slot[rx->cur].buf_idx = tmp;
        rx->slot[rx->cur].flags  |= NS_BUF_CHANGED;
        rx->cur = NETMAP_RING_NEXT(rx, rx->cur);
        rx->avail--;
    }
}

static int
netmap_port_open(uint32_t idx)
{
    int err;
    struct netmap_port *port;
    struct nmreq req;

    port = ports.p + idx;

    port->fd = rte_netmap_open("/dev/netmap", O_RDWR);

    strlcpy(req.nr_name, port->str, sizeof(req.nr_name));
    req.nr_version = NETMAP_API;
    req.nr_ringid = 0;

    err = rte_netmap_ioctl(port->fd, NIOCGINFO, &req);
    if (err) {
        printf("[E] NIOCGINFO ioctl failed (error %d)\n", err);
        return err;
    }

    strlcpy(req.nr_name, port->str, sizeof(req.nr_name));
    req.nr_version = NETMAP_API;
    req.nr_ringid = 0;

    err = rte_netmap_ioctl(port->fd, NIOCREGIF, &req);
    if (err) {
        printf("[E] NIOCREGIF ioctl failed (error %d)\n", err);
        return err;
    }

    /* mmap only once. */
    if (ports.mem == NULL)
        ports.mem = rte_netmap_mmap(NULL, req.nr_memsize,
            PROT_WRITE | PROT_READ, MAP_PRIVATE, port->fd, 0);

    if (ports.mem == MAP_FAILED) {
        printf("[E] NETMAP mmap failed for fd: %d)\n", port->fd);
        return -ENOMEM;
    }

    port->nmif = NETMAP_IF(ports.mem, req.nr_offset);

    port->tx_ring = NETMAP_TXRING(port->nmif, 0);
    port->rx_ring = NETMAP_RXRING(port->nmif, 0);

    return 0;
}


int main(int argc, char *argv[])
{
    int err, ret;
    uint32_t i, pmsk;
    struct nmreq req;
    struct pollfd pollfd[MAX_PORT_NUM];
    struct rte_mempool *pool;
    struct netmap_ring *rx_ring, *tx_ring;

    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Cannot initialize EAL\n");

    argc -= ret;
    argv += ret;

    parse_args(argc, argv);

    if (ports.num == 0)
        rte_exit(EXIT_FAILURE, "no ports specified\n");

    if (rte_eth_dev_count_avail() < 1)
        rte_exit(EXIT_FAILURE, "Not enough ethernet ports available\n");

    pool = rte_pktmbuf_pool_create("mbuf_pool", MBUF_PER_POOL, 32, 0,
        MBUF_DATA_SIZE, rte_socket_id());
    if (pool == NULL)
        rte_exit(EXIT_FAILURE, "Couldn't create mempool\n");

    netmap_conf.socket_id = rte_socket_id();
    err = rte_netmap_init(&netmap_conf);

    if (err < 0)
        rte_exit(EXIT_FAILURE,
            "Couldn't initialize librte_compat_netmap\n");
    else
        printf("librte_compat_netmap initialized\n");

    port_conf.pool = pool;
    port_conf.socket_id = rte_socket_id();

    for (i = 0; i != ports.num; i++) {

        err = rte_netmap_init_port(ports.p[i].id, &port_conf);
        if (err < 0)
            rte_exit(EXIT_FAILURE, "Couldn't setup port %hhu\n",
                ports.p[i].id);

        rte_eth_promiscuous_enable(ports.p[i].id);
    }

    for (i = 0; i != ports.num; i++) {

        err = netmap_port_open(i);
        if (err) {
            rte_exit(EXIT_FAILURE, "Couldn't set port %hhu "
                "under NETMAP control\n",
                ports.p[i].id);
        }
        else
            printf("Port %hhu now in Netmap mode\n", ports.p[i].id);
    }

    memset(pollfd, 0, sizeof(pollfd));

    for (i = 0; i != ports.num; i++) {
        pollfd[i].fd = ports.p[i].fd;
        pollfd[i].events = POLLIN | POLLOUT;
    }

    signal(SIGINT, sigint_handler);

    pmsk = ports.num - 1;

    printf("Bridge up and running!\n");

    while (!stop) {
        uint32_t n_pkts;

        pollfd[0].revents = 0;
        pollfd[1].revents = 0;

        ret = rte_netmap_poll(pollfd, ports.num, 0);
        if (ret < 0) {
            stop = 1;
                printf("[E] poll returned with error %d\n", ret);
        }

        if (((pollfd[0].revents | pollfd[1].revents) & POLLERR) != 0) {
            printf("POLLERR!\n");
        }

        if ((pollfd[0].revents & POLLIN) != 0 &&
                (pollfd[pmsk].revents & POLLOUT) != 0) {

            rx_ring = ports.p[0].rx_ring;
            tx_ring = ports.p[pmsk].tx_ring;

            n_pkts = RTE_MIN(rx_ring->avail, tx_ring->avail);
            move(n_pkts, rx_ring, tx_ring);
        }

        if (pmsk != 0 && (pollfd[pmsk].revents & POLLIN) != 0 &&
                (pollfd[0].revents & POLLOUT) != 0) {

            rx_ring = ports.p[pmsk].rx_ring;
            tx_ring = ports.p[0].tx_ring;

            n_pkts = RTE_MIN(rx_ring->avail, tx_ring->avail);
            move(n_pkts, rx_ring, tx_ring);
        }
    }

    printf("Bridge stopped!\n");

    for (i = 0; i != ports.num; i++) {
        err = rte_netmap_ioctl(ports.p[i].fd, NIOCUNREGIF, &req);
        if (err) {
            printf("[E] NIOCUNREGIF ioctl failed (error %d)\n",
                err);
        }
        else
            printf("Port %hhu unregistered from Netmap mode\n", ports.p[i].id);

        rte_netmap_close(ports.p[i].fd);
    }
    return 0;
}