examples/vdpa/main.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2018 Intel Corporation
 */

#include <getopt.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>

#include <rte_ethdev.h>
#include <rte_malloc.h>
#include <rte_vhost.h>
#include <rte_vdpa.h>
#include <rte_pci.h>
#include <rte_string_fns.h>

#include <cmdline_parse.h>
#include <cmdline_socket.h>
#include <cmdline_parse_string.h>
#include <cmdline_parse_num.h>
#include <cmdline.h>

#define MAX_PATH_LEN 128
#define MAX_VDPA_SAMPLE_PORTS 1024
#define RTE_LOGTYPE_VDPA RTE_LOGTYPE_USER1

struct vdpa_port {
    char ifname[MAX_PATH_LEN];
    struct rte_vdpa_device *dev;
    int vid;
    uint64_t flags;
    int stats_n;
    struct rte_vdpa_stat_name *stats_names;
    struct rte_vdpa_stat *stats;
};

static struct vdpa_port vports[MAX_VDPA_SAMPLE_PORTS];

static char iface[MAX_PATH_LEN];
static int devcnt;
static int interactive;
static int client_mode;

/* display usage */
static void
vdpa_usage(const char *prgname)
{
    printf("Usage: %s [EAL options] -- "
                 "  --interactive|-i: run in interactive mode.\n"
                 "  --iface <path>: specify the path prefix of the socket files, e.g. /tmp/vhost-user-.\n"
                 "  --client: register a vhost-user socket as client mode.\n",
                 prgname);
}

static int
parse_args(int argc, char **argv)
{
    static const char *short_option = "i";
    static struct option long_option[] = {
        {"iface", required_argument, NULL, 0},
        {"interactive", no_argument, &interactive, 1},
        {"client", no_argument, &client_mode, 1},
        {NULL, 0, 0, 0},
    };
    int opt, idx;
    char *prgname = argv[0];

    while ((opt = getopt_long(argc, argv, short_option, long_option, &idx))
            != EOF) {
        switch (opt) {
        case 'i':
            printf("Interactive-mode selected\n");
            interactive = 1;
            break;
        /* long options */
        case 0:
            if (strncmp(long_option[idx].name, "iface",
                        MAX_PATH_LEN) == 0) {
                rte_strscpy(iface, optarg, MAX_PATH_LEN);
                printf("iface %s\n", iface);
            }
            if (!strcmp(long_option[idx].name, "interactive")) {
                printf("Interactive-mode selected\n");
                interactive = 1;
            }
            break;

        default:
            vdpa_usage(prgname);
            return -1;
        }
    }

    if (iface[0] == '\0' && interactive == 0) {
        vdpa_usage(prgname);
        return -1;
    }

    return 0;
}

static int
new_device(int vid)
{
    char ifname[MAX_PATH_LEN];
    struct rte_device *dev;
    int i;

    rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
    for (i = 0; i < MAX_VDPA_SAMPLE_PORTS; i++) {
        if (strncmp(ifname, vports[i].ifname, MAX_PATH_LEN))
            continue;

        dev = rte_vdpa_get_rte_device(vports[i].dev);
        if (!dev) {
            RTE_LOG(ERR, VDPA,
                "Failed to get generic device for port %d\n", i);
            continue;
        }
        printf("\nnew port %s, device : %s\n", ifname, dev->name);
        vports[i].vid = vid;
        break;
    }

    if (i >= MAX_VDPA_SAMPLE_PORTS)
        return -1;

    return 0;
}

static void
destroy_device(int vid)
{
    struct rte_device *dev;
    char ifname[MAX_PATH_LEN];
    int i;

    rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
    for (i = 0; i < MAX_VDPA_SAMPLE_PORTS; i++) {
        if (strncmp(ifname, vports[i].ifname, MAX_PATH_LEN))
            continue;

        dev = rte_vdpa_get_rte_device(vports[i].dev);
        if (!dev) {
            RTE_LOG(ERR, VDPA,
                "Failed to get generic device for port %d\n", i);
            continue;
        }

        printf("\ndestroy port %s, device: %s\n", ifname, dev->name);
        break;
    }
}

static const struct vhost_device_ops vdpa_sample_devops = {
    .new_device = new_device,
    .destroy_device = destroy_device,
};

static int
start_vdpa(struct vdpa_port *vport)
{
    int ret;
    char *socket_path = vport->ifname;

    if (client_mode)
        vport->flags |= RTE_VHOST_USER_CLIENT;

    if (access(socket_path, F_OK) != -1 && !client_mode) {
        RTE_LOG(ERR, VDPA,
            "%s exists, please remove it or specify another file and try again.\n",
            socket_path);
        return -1;
    }
    ret = rte_vhost_driver_register(socket_path, vport->flags);
    if (ret != 0)
        rte_exit(EXIT_FAILURE,
            "register driver failed: %s\n",
            socket_path);

    ret = rte_vhost_driver_callback_register(socket_path,
            &vdpa_sample_devops);
    if (ret != 0)
        rte_exit(EXIT_FAILURE,
            "register driver ops failed: %s\n",
            socket_path);

    ret = rte_vhost_driver_attach_vdpa_device(socket_path, vport->dev);
    if (ret != 0)
        rte_exit(EXIT_FAILURE,
            "attach vdpa device failed: %s\n",
            socket_path);

    if (rte_vhost_driver_start(socket_path) < 0)
        rte_exit(EXIT_FAILURE,
            "start vhost driver failed: %s\n",
            socket_path);
    return 0;
}

static void
close_vdpa(struct vdpa_port *vport)
{
    int ret;
    char *socket_path = vport->ifname;

    ret = rte_vhost_driver_detach_vdpa_device(socket_path);
    if (ret != 0)
        RTE_LOG(ERR, VDPA,
                "detach vdpa device failed: %s\n",
                socket_path);

    ret = rte_vhost_driver_unregister(socket_path);
    if (ret != 0)
        RTE_LOG(ERR, VDPA,
                "Fail to unregister vhost driver for %s.\n",
                socket_path);
    if (vport->stats_names) {
        rte_free(vport->stats_names);
        vport->stats_names = NULL;
    }
}

static void
vdpa_sample_quit(void)
{
    int i;
    for (i = 0; i < RTE_MIN(MAX_VDPA_SAMPLE_PORTS, devcnt); i++) {
        if (vports[i].ifname[0] != '\0')
            close_vdpa(&vports[i]);
    }
}

static void
signal_handler(int signum)
{
    if (signum == SIGINT || signum == SIGTERM) {
        printf("\nSignal %d received, preparing to exit...\n", signum);
        vdpa_sample_quit();
        exit(0);
    }
}

/* interactive cmds */

/* *** Help command with introduction. *** */
struct cmd_help_result {
    cmdline_fixed_string_t help;
};

static void cmd_help_parsed(__rte_unused void *parsed_result,
        struct cmdline *cl,
        __rte_unused void *data)
{
    cmdline_printf(
        cl,
        "\n"
        "The following commands are currently available:\n\n"
        "Control:\n"
        "    help                                      : Show interactive instructions.\n"
        "    list                                      : list all available vdpa devices.\n"
        "    create <socket file> <vdev addr>          : create a new vdpa port.\n"
        "    stats <device ID> <virtio queue ID>       : show statistics of virtio queue, 0xffff for all.\n"
        "    quit                                      : exit vdpa sample app.\n"
    );
}

cmdline_parse_token_string_t cmd_help_help =
    TOKEN_STRING_INITIALIZER(struct cmd_help_result, help, "help");

cmdline_parse_inst_t cmd_help = {
    .f = cmd_help_parsed,
    .data = NULL,
    .help_str = "show help",
    .tokens = {
        (void *)&cmd_help_help,
        NULL,
    },
};

/* *** List all available vdpa devices *** */
struct cmd_list_result {
    cmdline_fixed_string_t action;
};

static void cmd_list_vdpa_devices_parsed(
        __rte_unused void *parsed_result,
        struct cmdline *cl,
        __rte_unused void *data)
{
    uint32_t queue_num;
    uint64_t features;
    struct rte_vdpa_device *vdev;
    struct rte_device *dev;
    struct rte_dev_iterator dev_iter;

    cmdline_printf(cl, "device name\tqueue num\tsupported features\n");
    RTE_DEV_FOREACH(dev, "class=vdpa", &dev_iter) {
        vdev = rte_vdpa_find_device_by_name(dev->name);
        if (!vdev)
            continue;
        if (rte_vdpa_get_queue_num(vdev, &queue_num) < 0) {
            RTE_LOG(ERR, VDPA,
                "failed to get vdpa queue number "
                "for device %s.\n", dev->name);
            continue;
        }
        if (rte_vdpa_get_features(vdev, &features) < 0) {
            RTE_LOG(ERR, VDPA,
                "failed to get vdpa features "
                "for device %s.\n", dev->name);
            continue;
        }
        cmdline_printf(cl, "%s\t\t%" PRIu32 "\t\t0x%" PRIx64 "\n",
            dev->name, queue_num, features);
    }
}

cmdline_parse_token_string_t cmd_action_list =
    TOKEN_STRING_INITIALIZER(struct cmd_list_result, action, "list");

cmdline_parse_inst_t cmd_list_vdpa_devices = {
    .f = cmd_list_vdpa_devices_parsed,
    .data = NULL,
    .help_str = "list all available vdpa devices",
    .tokens = {
        (void *)&cmd_action_list,
        NULL,
    },
};

/* *** Create new vdpa port *** */
struct cmd_create_result {
    cmdline_fixed_string_t action;
    cmdline_fixed_string_t socket_path;
    cmdline_fixed_string_t bdf;
};

static void cmd_create_vdpa_port_parsed(void *parsed_result,
        struct cmdline *cl,
        __rte_unused void *data)
{
    struct rte_vdpa_device *dev;
    struct cmd_create_result *res = parsed_result;

    rte_strscpy(vports[devcnt].ifname, res->socket_path, MAX_PATH_LEN);
    dev = rte_vdpa_find_device_by_name(res->bdf);
    if (dev == NULL) {
        cmdline_printf(cl, "Unable to find vdpa device id for %s.\n",
                res->bdf);
        return;
    }

    vports[devcnt].dev = dev;

    if (start_vdpa(&vports[devcnt]) == 0)
        devcnt++;
}

cmdline_parse_token_string_t cmd_action_create =
    TOKEN_STRING_INITIALIZER(struct cmd_create_result, action, "create");
cmdline_parse_token_string_t cmd_socket_path =
    TOKEN_STRING_INITIALIZER(struct cmd_create_result, socket_path, NULL);
cmdline_parse_token_string_t cmd_bdf =
    TOKEN_STRING_INITIALIZER(struct cmd_create_result, bdf, NULL);

cmdline_parse_inst_t cmd_create_vdpa_port = {
    .f = cmd_create_vdpa_port_parsed,
    .data = NULL,
    .help_str = "create a new vdpa port",
    .tokens = {
        (void *)&cmd_action_create,
        (void *)&cmd_socket_path,
        (void *)&cmd_bdf,
        NULL,
    },
};

/* *** STATS *** */
struct cmd_stats_result {
    cmdline_fixed_string_t stats;
    cmdline_fixed_string_t bdf;
    uint16_t qid;
};

static void cmd_device_stats_parsed(void *parsed_result, struct cmdline *cl,
                    __rte_unused void *data)
{
    struct cmd_stats_result *res = parsed_result;
    struct rte_vdpa_device *vdev = rte_vdpa_find_device_by_name(res->bdf);
    struct vdpa_port *vport = NULL;
    uint32_t first, last;
    int i;

    if (!vdev) {
        RTE_LOG(ERR, VDPA, "Invalid device: %s.\n",
            res->bdf);
        return;
    }
    for (i = 0; i < RTE_MIN(MAX_VDPA_SAMPLE_PORTS, devcnt); i++) {
        if (vports[i].dev == vdev) {
            vport = &vports[i];
            break;
        }
    }
    if (!vport) {
        RTE_LOG(ERR, VDPA, "Device %s was not created.\n", res->bdf);
        return;
    }
    if (res->qid == 0xFFFF) {
        first = 0;
        last = rte_vhost_get_vring_num(vport->vid);
        if (last == 0) {
            RTE_LOG(ERR, VDPA, "Failed to get num of actual virtqs"
                " for device %s.\n", res->bdf);
            return;
        }
        last--;
    } else {
        first = res->qid;
        last = res->qid;
    }
    if (!vport->stats_names) {
        vport->stats_n = rte_vdpa_get_stats_names(vport->dev, NULL, 0);
        if (vport->stats_n <= 0) {
            RTE_LOG(ERR, VDPA, "Failed to get names number of "
                "device %s stats.\n", res->bdf);
            return;
        }
        vport->stats_names = rte_zmalloc(NULL,
            (sizeof(*vport->stats_names) + sizeof(*vport->stats)) *
                            vport->stats_n, 0);
        if (!vport->stats_names) {
            RTE_LOG(ERR, VDPA, "Failed to allocate memory for stat"
                " names of device %s.\n", res->bdf);
            return;
        }
        i = rte_vdpa_get_stats_names(vport->dev, vport->stats_names,
                        vport->stats_n);
        if (vport->stats_n != i) {
            RTE_LOG(ERR, VDPA, "Failed to get names of device %s "
                "stats.\n", res->bdf);
            return;
        }
        vport->stats = (struct rte_vdpa_stat *)
                    (vport->stats_names + vport->stats_n);
    }
    cmdline_printf(cl, "\nDevice %s:\n", res->bdf);
    for (; first <= last; first++) {
        memset(vport->stats, 0, sizeof(*vport->stats) * vport->stats_n);
        if (rte_vdpa_get_stats(vport->dev, (int)first, vport->stats,
                    vport->stats_n) <= 0) {
            RTE_LOG(ERR, VDPA, "Failed to get vdpa queue statistics"
                " for device %s qid %d.\n", res->bdf,
                (int)first);
            return;
        }
        cmdline_printf(cl, "\tVirtq %" PRIu32 ":\n", first);
        for (i = 0; i < vport->stats_n; ++i) {
            cmdline_printf(cl, "\t\t%-*s %-16" PRIu64 "\n",
                RTE_VDPA_STATS_NAME_SIZE,
                vport->stats_names[vport->stats[i].id].name,
                vport->stats[i].value);
        }
    }
}

cmdline_parse_token_string_t cmd_device_stats_ =
    TOKEN_STRING_INITIALIZER(struct cmd_stats_result, stats, "stats");
cmdline_parse_token_string_t cmd_device_bdf =
    TOKEN_STRING_INITIALIZER(struct cmd_stats_result, bdf, NULL);
cmdline_parse_token_num_t cmd_queue_id =
    TOKEN_NUM_INITIALIZER(struct cmd_stats_result, qid, RTE_UINT32);

cmdline_parse_inst_t cmd_device_stats = {
    .f = cmd_device_stats_parsed,
    .data = NULL,
    .help_str = "stats: show device statistics",
    .tokens = {
        (void *)&cmd_device_stats_,
        (void *)&cmd_device_bdf,
        (void *)&cmd_queue_id,
        NULL,
    },
};

/* *** QUIT *** */
struct cmd_quit_result {
    cmdline_fixed_string_t quit;
};

static void cmd_quit_parsed(__rte_unused void *parsed_result,
        struct cmdline *cl,
        __rte_unused void *data)
{
    vdpa_sample_quit();
    cmdline_quit(cl);
}

cmdline_parse_token_string_t cmd_quit_quit =
    TOKEN_STRING_INITIALIZER(struct cmd_quit_result, quit, "quit");

cmdline_parse_inst_t cmd_quit = {
    .f = cmd_quit_parsed,
    .data = NULL,
    .help_str = "quit: exit application",
    .tokens = {
        (void *)&cmd_quit_quit,
        NULL,
    },
};
cmdline_parse_ctx_t main_ctx[] = {
    (cmdline_parse_inst_t *)&cmd_help,
    (cmdline_parse_inst_t *)&cmd_list_vdpa_devices,
    (cmdline_parse_inst_t *)&cmd_create_vdpa_port,
    (cmdline_parse_inst_t *)&cmd_device_stats,
    (cmdline_parse_inst_t *)&cmd_quit,
    NULL,
};

int
main(int argc, char *argv[])
{
    char ch;
    int ret;
    struct cmdline *cl;
    struct rte_vdpa_device *vdev;
    struct rte_device *dev;
    struct rte_dev_iterator dev_iter;

    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "eal init failed\n");
    argc -= ret;
    argv += ret;

    signal(SIGINT, signal_handler);
    signal(SIGTERM, signal_handler);

    ret = parse_args(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "invalid argument\n");

    if (interactive == 1) {
        cl = cmdline_stdin_new(main_ctx, "vdpa> ");
        if (cl == NULL)
            rte_panic("Cannot create cmdline instance\n");
        cmdline_interact(cl);
        cmdline_stdin_exit(cl);
    } else {
        RTE_DEV_FOREACH(dev, "class=vdpa", &dev_iter) {
            vdev = rte_vdpa_find_device_by_name(dev->name);
            if (vdev == NULL) {
                rte_panic("Failed to find vDPA dev for %s\n",
                        dev->name);
            }
            vports[devcnt].dev = vdev;
            snprintf(vports[devcnt].ifname, MAX_PATH_LEN, "%s%d",
                    iface, devcnt);

            start_vdpa(&vports[devcnt]);
            devcnt++;
        }

        printf("enter \'q\' to quit\n");
        while (scanf("%c", &ch)) {
            if (ch == 'q')
                break;
            while (ch != '\n') {
                if (scanf("%c", &ch))
                    printf("%c", ch);
            }
            printf("enter \'q\' to quit\n");
        }
        vdpa_sample_quit();
    }

    /* clean up the EAL */
    rte_eal_cleanup();

    return 0;
}