examples/ptpclient/ptpclient.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2015 Intel Corporation
 */
 
/*
 * This application is a simple Layer 2 PTP v2 client. It shows delta values
 * which are used to synchronize the PHC clock. if the "-T 1" parameter is
 * passed to the application the Linux kernel clock is also synchronized.
 */
 
#include <stdint.h>
#include <stdlib.h>
#include <inttypes.h>
#include <rte_eal.h>
#include <rte_ethdev.h>
#include <rte_cycles.h>
#include <rte_lcore.h>
#include <rte_mbuf.h>
#include <rte_ip.h>
#include <limits.h>
#include <sys/time.h>
#include <getopt.h>
 
#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024
 
#define NUM_MBUFS            8191
#define MBUF_CACHE_SIZE       250
 
/* Values for the PTP messageType field. */
#define SYNC                  0x0
#define DELAY_REQ             0x1
#define PDELAY_REQ            0x2
#define PDELAY_RESP           0x3
#define FOLLOW_UP             0x8
#define DELAY_RESP            0x9
#define PDELAY_RESP_FOLLOW_UP 0xA
#define ANNOUNCE              0xB
#define SIGNALING             0xC
#define MANAGEMENT            0xD
 
#define NSEC_PER_SEC        1000000000L
#define KERNEL_TIME_ADJUST_LIMIT  20000
#define PTP_PROTOCOL             0x88F7
 
struct rte_mempool *mbuf_pool;
uint32_t ptp_enabled_port_mask;
uint8_t ptp_enabled_port_nb;
static uint8_t ptp_enabled_ports[RTE_MAX_ETHPORTS];
 
static const struct rte_ether_addr ether_multicast = {
    .addr_bytes = {0x01, 0x1b, 0x19, 0x0, 0x0, 0x0}
};
 
/* Structs used for PTP handling. */
struct tstamp {
    uint16_t   sec_msb;
    uint32_t   sec_lsb;
    uint32_t   ns;
}  __rte_packed;
 
struct clock_id {
    uint8_t id[8];
};
 
struct port_id {
    struct clock_id        clock_id;
    uint16_t               port_number;
}  __rte_packed;
 
struct ptp_header {
    uint8_t              msg_type;
    uint8_t              ver;
    uint16_t             message_length;
    uint8_t              domain_number;
    uint8_t              reserved1;
    uint8_t              flag_field[2];
    int64_t              correction;
    uint32_t             reserved2;
    struct port_id       source_port_id;
    uint16_t             seq_id;
    uint8_t              control;
    int8_t               log_message_interval;
} __rte_packed;
 
struct sync_msg {
    struct ptp_header   hdr;
    struct tstamp       origin_tstamp;
} __rte_packed;
 
struct follow_up_msg {
    struct ptp_header   hdr;
    struct tstamp       precise_origin_tstamp;
    uint8_t             suffix[];
} __rte_packed;
 
struct delay_req_msg {
    struct ptp_header   hdr;
    struct tstamp       origin_tstamp;
} __rte_packed;
 
struct delay_resp_msg {
    struct ptp_header    hdr;
    struct tstamp        rx_tstamp;
    struct port_id       req_port_id;
    uint8_t              suffix[];
} __rte_packed;
 
struct ptp_message {
    union {
        struct ptp_header          header;
        struct sync_msg            sync;
        struct delay_req_msg       delay_req;
        struct follow_up_msg       follow_up;
        struct delay_resp_msg      delay_resp;
    } __rte_packed;
};
 
struct ptpv2_data_slave_ordinary {
    struct rte_mbuf *m;
    struct timespec tstamp1;
    struct timespec tstamp2;
    struct timespec tstamp3;
    struct timespec tstamp4;
    struct clock_id client_clock_id;
    struct clock_id master_clock_id;
    struct timeval new_adj;
    int64_t delta;
    uint16_t portid;
    uint16_t seqID_SYNC;
    uint16_t seqID_FOLLOWUP;
    uint8_t ptpset;
    uint8_t kernel_time_set;
    uint16_t current_ptp_port;
};
 
static struct ptpv2_data_slave_ordinary ptp_data;
 
static inline uint64_t timespec64_to_ns(const struct timespec *ts)
{
    return ((uint64_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
}
 
static struct timeval
ns_to_timeval(int64_t nsec)
{
    struct timespec t_spec = {0, 0};
    struct timeval t_eval = {0, 0};
    int32_t rem;
 
    if (nsec == 0)
        return t_eval;
    rem = nsec % NSEC_PER_SEC;
    t_spec.tv_sec = nsec / NSEC_PER_SEC;
 
    if (rem < 0) {
        t_spec.tv_sec--;
        rem += NSEC_PER_SEC;
    }
 
    t_spec.tv_nsec = rem;
    t_eval.tv_sec = t_spec.tv_sec;
    t_eval.tv_usec = t_spec.tv_nsec / 1000;
 
    return t_eval;
}
 
/*
 * Initializes a given port using global settings and with the RX buffers
 * coming from the mbuf_pool passed as a parameter.
 */
static inline int
port_init(uint16_t port, struct rte_mempool *mbuf_pool)
{
    struct rte_eth_dev_info dev_info;
    struct rte_eth_conf port_conf;
    const uint16_t rx_rings = 1;
    const uint16_t tx_rings = 1;
    int retval;
    uint16_t q;
    uint16_t nb_rxd = RX_RING_SIZE;
    uint16_t nb_txd = TX_RING_SIZE;
 
    if (!rte_eth_dev_is_valid_port(port))
        return -1;
 
    memset(&port_conf, 0, sizeof(struct rte_eth_conf));
 
    retval = rte_eth_dev_info_get(port, &dev_info);
    if (retval != 0) {
        printf("Error during getting device (port %u) info: %s\n",
                port, strerror(-retval));
 
        return retval;
    }
 
    if (dev_info.rx_offload_capa & RTE_ETH_RX_OFFLOAD_TIMESTAMP)
        port_conf.rxmode.offloads |= RTE_ETH_RX_OFFLOAD_TIMESTAMP;
 
    if (dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE)
        port_conf.txmode.offloads |=
            RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE;
    /* Force full Tx path in the driver, required for IEEE1588 */
    port_conf.txmode.offloads |= RTE_ETH_TX_OFFLOAD_MULTI_SEGS;
 
    /* Configure the Ethernet device. */
    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)
        return retval;
 
    /* Allocate and set up 1 RX queue per Ethernet port. */
    for (q = 0; q < rx_rings; q++) {
        struct rte_eth_rxconf *rxconf;
 
        rxconf = &dev_info.default_rxconf;
        rxconf->offloads = port_conf.rxmode.offloads;
 
        retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
                rte_eth_dev_socket_id(port), rxconf, mbuf_pool);
 
        if (retval < 0)
            return retval;
    }
 
    /* Allocate and set up 1 TX queue per Ethernet port. */
    for (q = 0; q < tx_rings; q++) {
        struct rte_eth_txconf *txconf;
 
        txconf = &dev_info.default_txconf;
        txconf->offloads = port_conf.txmode.offloads;
 
        retval = rte_eth_tx_queue_setup(port, q, nb_txd,
                rte_eth_dev_socket_id(port), txconf);
        if (retval < 0)
            return retval;
    }
 
    /* Start the Ethernet port. */
    retval = rte_eth_dev_start(port);
    if (retval < 0)
        return retval;
 
    /* Enable timesync timestamping for the Ethernet device */
    retval = rte_eth_timesync_enable(port);
    if (retval < 0) {
        printf("Timesync enable failed: %d\n", retval);
        return retval;
    }
 
    /* Enable RX in promiscuous mode for the Ethernet device. */
    retval = rte_eth_promiscuous_enable(port);
    if (retval != 0) {
        printf("Promiscuous mode enable failed: %s\n",
            rte_strerror(-retval));
        return retval;
    }
 
    return 0;
}
 
static void
print_clock_info(struct ptpv2_data_slave_ordinary *ptp_data)
{
    int64_t nsec;
    struct timespec net_time, sys_time;
 
    printf("Master Clock id: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
        ptp_data->master_clock_id.id[0],
        ptp_data->master_clock_id.id[1],
        ptp_data->master_clock_id.id[2],
        ptp_data->master_clock_id.id[3],
        ptp_data->master_clock_id.id[4],
        ptp_data->master_clock_id.id[5],
        ptp_data->master_clock_id.id[6],
        ptp_data->master_clock_id.id[7]);
 
    printf("\nT2 - Slave  Clock.  %lds %ldns",
            (ptp_data->tstamp2.tv_sec),
            (ptp_data->tstamp2.tv_nsec));
 
    printf("\nT1 - Master Clock.  %lds %ldns ",
            ptp_data->tstamp1.tv_sec,
            (ptp_data->tstamp1.tv_nsec));
 
    printf("\nT3 - Slave  Clock.  %lds %ldns",
            ptp_data->tstamp3.tv_sec,
            (ptp_data->tstamp3.tv_nsec));
 
    printf("\nT4 - Master Clock.  %lds %ldns ",
            ptp_data->tstamp4.tv_sec,
            (ptp_data->tstamp4.tv_nsec));
 
    printf("\nDelta between master and slave clocks:%"PRId64"ns\n",
            ptp_data->delta);
 
    clock_gettime(CLOCK_REALTIME, &sys_time);
    rte_eth_timesync_read_time(ptp_data->current_ptp_port, &net_time);
 
    time_t ts = net_time.tv_sec;
 
    printf("\n\nComparison between Linux kernel Time and PTP:");
 
    printf("\nCurrent PTP Time: %.24s %.9ld ns",
            ctime(&ts), net_time.tv_nsec);
 
    nsec = (int64_t)timespec64_to_ns(&net_time) -
            (int64_t)timespec64_to_ns(&sys_time);
    ptp_data->new_adj = ns_to_timeval(nsec);
 
    gettimeofday(&ptp_data->new_adj, NULL);
 
    time_t tp = ptp_data->new_adj.tv_sec;
 
    printf("\nCurrent SYS Time: %.24s %.6ld ns",
                ctime(&tp), ptp_data->new_adj.tv_usec);
 
    printf("\nDelta between PTP and Linux Kernel time:%"PRId64"ns\n",
                nsec);
 
    printf("[Ctrl+C to quit]\n");
 
    /* Clear screen and put cursor in column 1, row 1 */
    printf("\033[2J\033[1;1H");
}
 
static int64_t
delta_eval(struct ptpv2_data_slave_ordinary *ptp_data)
{
    int64_t delta;
    uint64_t t1 = 0;
    uint64_t t2 = 0;
    uint64_t t3 = 0;
    uint64_t t4 = 0;
 
    t1 = timespec64_to_ns(&ptp_data->tstamp1);
    t2 = timespec64_to_ns(&ptp_data->tstamp2);
    t3 = timespec64_to_ns(&ptp_data->tstamp3);
    t4 = timespec64_to_ns(&ptp_data->tstamp4);
 
    delta = -((int64_t)((t2 - t1) - (t4 - t3))) / 2;
 
    return delta;
}
 
/*
 * Parse the PTP SYNC message.
 */
static void
parse_sync(struct ptpv2_data_slave_ordinary *ptp_data, uint16_t rx_tstamp_idx)
{
    struct ptp_header *ptp_hdr;
 
    ptp_hdr = (struct ptp_header *)(rte_pktmbuf_mtod(ptp_data->m, char *)
            + sizeof(struct rte_ether_hdr));
    ptp_data->seqID_SYNC = rte_be_to_cpu_16(ptp_hdr->seq_id);
 
    if (ptp_data->ptpset == 0) {
        rte_memcpy(&ptp_data->master_clock_id,
                &ptp_hdr->source_port_id.clock_id,
                sizeof(struct clock_id));
        ptp_data->ptpset = 1;
    }
 
    if (memcmp(&ptp_hdr->source_port_id.clock_id,
            &ptp_hdr->source_port_id.clock_id,
            sizeof(struct clock_id)) == 0) {
 
        if (ptp_data->ptpset == 1)
            rte_eth_timesync_read_rx_timestamp(ptp_data->portid,
                    &ptp_data->tstamp2, rx_tstamp_idx);
    }
 
}
 
/*
 * Parse the PTP FOLLOWUP message and send DELAY_REQ to the main clock.
 */
static void
parse_fup(struct ptpv2_data_slave_ordinary *ptp_data)
{
    struct rte_ether_hdr *eth_hdr;
    struct rte_ether_addr eth_addr;
    struct ptp_header *ptp_hdr;
    struct clock_id *client_clkid;
    struct ptp_message *ptp_msg;
    struct delay_req_msg *req_msg;
    struct rte_mbuf *created_pkt;
    struct tstamp *origin_tstamp;
    struct rte_ether_addr eth_multicast = ether_multicast;
    size_t pkt_size;
    int wait_us;
    struct rte_mbuf *m = ptp_data->m;
    int ret;
 
    eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
    ptp_hdr = (struct ptp_header *)(rte_pktmbuf_mtod(m, char *)
            + sizeof(struct rte_ether_hdr));
    if (memcmp(&ptp_data->master_clock_id,
            &ptp_hdr->source_port_id.clock_id,
            sizeof(struct clock_id)) != 0)
        return;
 
    ptp_data->seqID_FOLLOWUP = rte_be_to_cpu_16(ptp_hdr->seq_id);
    ptp_msg = (struct ptp_message *) (rte_pktmbuf_mtod(m, char *) +
                      sizeof(struct rte_ether_hdr));
 
    origin_tstamp = &ptp_msg->follow_up.precise_origin_tstamp;
    ptp_data->tstamp1.tv_nsec = ntohl(origin_tstamp->ns);
    ptp_data->tstamp1.tv_sec =
        ((uint64_t)ntohl(origin_tstamp->sec_lsb)) |
        (((uint64_t)ntohs(origin_tstamp->sec_msb)) << 32);
 
    if (ptp_data->seqID_FOLLOWUP == ptp_data->seqID_SYNC) {
        ret = rte_eth_macaddr_get(ptp_data->portid, &eth_addr);
        if (ret != 0) {
            printf("\nCore %u: port %u failed to get MAC address: %s\n",
                rte_lcore_id(), ptp_data->portid,
                rte_strerror(-ret));
            return;
        }
 
        created_pkt = rte_pktmbuf_alloc(mbuf_pool);
        pkt_size = sizeof(struct rte_ether_hdr) +
            sizeof(struct delay_req_msg);
 
        if (rte_pktmbuf_append(created_pkt, pkt_size) == NULL) {
            rte_pktmbuf_free(created_pkt);
            return;
        }
        created_pkt->data_len = pkt_size;
        created_pkt->pkt_len = pkt_size;
        eth_hdr = rte_pktmbuf_mtod(created_pkt, struct rte_ether_hdr *);
        rte_ether_addr_copy(&eth_addr, &eth_hdr->src_addr);
 
        /* Set multicast address 01-1B-19-00-00-00. */
        rte_ether_addr_copy(&eth_multicast, &eth_hdr->dst_addr);
 
        eth_hdr->ether_type = htons(PTP_PROTOCOL);
        req_msg = rte_pktmbuf_mtod_offset(created_pkt,
            struct delay_req_msg *, sizeof(struct
            rte_ether_hdr));
 
        req_msg->hdr.seq_id = htons(ptp_data->seqID_SYNC);
        req_msg->hdr.msg_type = DELAY_REQ;
        req_msg->hdr.ver = 2;
        req_msg->hdr.control = 1;
        req_msg->hdr.log_message_interval = 127;
        req_msg->hdr.message_length =
            htons(sizeof(struct delay_req_msg));
        req_msg->hdr.domain_number = ptp_hdr->domain_number;
 
        /* Set up clock id. */
        client_clkid =
            &req_msg->hdr.source_port_id.clock_id;
 
        client_clkid->id[0] = eth_hdr->src_addr.addr_bytes[0];
        client_clkid->id[1] = eth_hdr->src_addr.addr_bytes[1];
        client_clkid->id[2] = eth_hdr->src_addr.addr_bytes[2];
        client_clkid->id[3] = 0xFF;
        client_clkid->id[4] = 0xFE;
        client_clkid->id[5] = eth_hdr->src_addr.addr_bytes[3];
        client_clkid->id[6] = eth_hdr->src_addr.addr_bytes[4];
        client_clkid->id[7] = eth_hdr->src_addr.addr_bytes[5];
 
        rte_memcpy(&ptp_data->client_clock_id,
               client_clkid,
               sizeof(struct clock_id));
 
        /* Enable flag for hardware timestamping. */
        created_pkt->ol_flags |= RTE_MBUF_F_TX_IEEE1588_TMST;
 
        /*Read value from NIC to prevent latching with old value. */
        rte_eth_timesync_read_tx_timestamp(ptp_data->portid,
                &ptp_data->tstamp3);
 
        /* Transmit the packet. */
        rte_eth_tx_burst(ptp_data->portid, 0, &created_pkt, 1);
 
        wait_us = 0;
        ptp_data->tstamp3.tv_nsec = 0;
        ptp_data->tstamp3.tv_sec = 0;
 
        /* Wait at least 1 us to read TX timestamp. */
        while ((rte_eth_timesync_read_tx_timestamp(ptp_data->portid,
                &ptp_data->tstamp3) < 0) && (wait_us < 1000)) {
            rte_delay_us(1);
            wait_us++;
        }
    }
}
 
/*
 * Update the kernel time with the difference between it and the current NIC
 * time.
 */
static inline void
update_kernel_time(void)
{
    int64_t nsec;
    struct timespec net_time, sys_time;
 
    clock_gettime(CLOCK_REALTIME, &sys_time);
    rte_eth_timesync_read_time(ptp_data.current_ptp_port, &net_time);
 
    nsec = (int64_t)timespec64_to_ns(&net_time) -
           (int64_t)timespec64_to_ns(&sys_time);
 
    ptp_data.new_adj = ns_to_timeval(nsec);
 
    /*
     * If difference between kernel time and system time in NIC is too big
     * (more than +/- 20 microseconds), use clock_settime to set directly
     * the kernel time, as adjtime is better for small adjustments (takes
     * longer to adjust the time).
     */
 
    if (nsec > KERNEL_TIME_ADJUST_LIMIT || nsec < -KERNEL_TIME_ADJUST_LIMIT)
        clock_settime(CLOCK_REALTIME, &net_time);
    else
        adjtime(&ptp_data.new_adj, 0);
 
 
}
 
/*
 * Parse the DELAY_RESP message.
 */
static void
parse_drsp(struct ptpv2_data_slave_ordinary *ptp_data)
{
    struct rte_mbuf *m = ptp_data->m;
    struct ptp_message *ptp_msg;
    struct tstamp *rx_tstamp;
    uint16_t seq_id;
 
    ptp_msg = (struct ptp_message *) (rte_pktmbuf_mtod(m, char *) +
                    sizeof(struct rte_ether_hdr));
    seq_id = rte_be_to_cpu_16(ptp_msg->delay_resp.hdr.seq_id);
    if (memcmp(&ptp_data->client_clock_id,
           &ptp_msg->delay_resp.req_port_id.clock_id,
           sizeof(struct clock_id)) == 0) {
        if (seq_id == ptp_data->seqID_FOLLOWUP) {
            rx_tstamp = &ptp_msg->delay_resp.rx_tstamp;
            ptp_data->tstamp4.tv_nsec = ntohl(rx_tstamp->ns);
            ptp_data->tstamp4.tv_sec =
                ((uint64_t)ntohl(rx_tstamp->sec_lsb)) |
                (((uint64_t)ntohs(rx_tstamp->sec_msb)) << 32);
 
            /* Evaluate the delta for adjustment. */
            ptp_data->delta = delta_eval(ptp_data);
 
            rte_eth_timesync_adjust_time(ptp_data->portid,
                             ptp_data->delta);
 
            ptp_data->current_ptp_port = ptp_data->portid;
 
            /* Update kernel time if enabled in app parameters. */
            if (ptp_data->kernel_time_set == 1)
                update_kernel_time();
 
 
 
        }
    }
}
 
/* This function processes PTP packets, implementing slave PTP IEEE1588 L2
 * functionality.
 */
 
/* Parse ptp frames. 8< */
static void
parse_ptp_frames(uint16_t portid, struct rte_mbuf *m) {
    struct ptp_header *ptp_hdr;
    struct rte_ether_hdr *eth_hdr;
    uint16_t eth_type;
 
    eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
    eth_type = rte_be_to_cpu_16(eth_hdr->ether_type);
 
    if (eth_type == PTP_PROTOCOL) {
        ptp_data.m = m;
        ptp_data.portid = portid;
        ptp_hdr = (struct ptp_header *)(rte_pktmbuf_mtod(m, char *)
                    + sizeof(struct rte_ether_hdr));
 
        switch (ptp_hdr->msg_type) {
        case SYNC:
            parse_sync(&ptp_data, m->timesync);
            break;
        case FOLLOW_UP:
            parse_fup(&ptp_data);
            break;
        case DELAY_RESP:
            parse_drsp(&ptp_data);
            print_clock_info(&ptp_data);
            break;
        default:
            break;
        }
    }
}
/* >8 End of function processes PTP packets. */
 
/*
 * The lcore main. This is the main thread that does the work, reading from an
 * input port and writing to an output port.
 */
static __rte_noreturn void
lcore_main(void)
{
    uint16_t portid;
    unsigned nb_rx;
    struct rte_mbuf *m;
 
    printf("\nCore %u Waiting for SYNC packets. [Ctrl+C to quit]\n",
            rte_lcore_id());
 
    /* Run until the application is quit or killed. */
 
    while (1) {
        /* Read packet from RX queues. 8< */
        for (portid = 0; portid < ptp_enabled_port_nb; portid++) {
 
            portid = ptp_enabled_ports[portid];
            nb_rx = rte_eth_rx_burst(portid, 0, &m, 1);
 
            if (likely(nb_rx == 0))
                continue;
 
            /* Packet is parsed to determine which type. 8< */
            if (m->ol_flags & RTE_MBUF_F_RX_IEEE1588_PTP)
                parse_ptp_frames(portid, m);
            /* >8 End of packet is parsed to determine which type. */
 
            rte_pktmbuf_free(m);
        }
        /* >8 End of read packets from RX queues. */
    }
}
 
static void
print_usage(const char *prgname)
{
    printf("%s [EAL options] -- -p PORTMASK -T VALUE\n"
        " -T VALUE: 0 - Disable, 1 - Enable Linux Clock"
        " Synchronization (0 default)\n"
        " -p PORTMASK: hexadecimal bitmask of ports to configure\n",
        prgname);
}
 
static int
ptp_parse_portmask(const char *portmask)
{
    char *end = NULL;
    unsigned long pm;
 
    /* Parse the hexadecimal string. */
    pm = strtoul(portmask, &end, 16);
 
    if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
        return 0;
 
    return pm;
}
 
static int
parse_ptp_kernel(const char *param)
{
    char *end = NULL;
    unsigned long pm;
 
    /* Parse the hexadecimal string. */
    pm = strtoul(param, &end, 16);
 
    if ((param[0] == '\0') || (end == NULL) || (*end != '\0'))
        return -1;
    if (pm == 0)
        return 0;
 
    return 1;
}
 
/* Parse the commandline arguments. */
static int
ptp_parse_args(int argc, char **argv)
{
    int opt, ret;
    char **argvopt;
    int option_index;
    char *prgname = argv[0];
    static struct option lgopts[] = { {NULL, 0, 0, 0} };
 
    argvopt = argv;
 
    while ((opt = getopt_long(argc, argvopt, "p:T:",
                  lgopts, &option_index)) != EOF) {
 
        switch (opt) {
 
        /* Portmask. */
        case 'p':
            ptp_enabled_port_mask = ptp_parse_portmask(optarg);
            if (ptp_enabled_port_mask == 0) {
                printf("invalid portmask\n");
                print_usage(prgname);
                return -1;
            }
            break;
        /* Time synchronization. */
        case 'T':
            ret = parse_ptp_kernel(optarg);
            if (ret < 0) {
                print_usage(prgname);
                return -1;
            }
 
            ptp_data.kernel_time_set = ret;
            break;
 
        default:
            print_usage(prgname);
            return -1;
        }
    }
 
    argv[optind-1] = prgname;
 
    optind = 1; /* Reset getopt lib. */
 
    return 0;
}
 
/*
 * The main function, which does initialization and calls the per-lcore
 * functions.
 */
int
main(int argc, char *argv[])
{
    unsigned nb_ports;
 
    uint16_t portid;
 
    /* Initialize the Environment Abstraction Layer (EAL). 8< */
    int ret = rte_eal_init(argc, argv);
 
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
    /* >8 End of initialization of EAL. */
 
    memset(&ptp_data, '\0', sizeof(struct ptpv2_data_slave_ordinary));
 
    /* Parse specific arguments. 8< */
    argc -= ret;
    argv += ret;
 
    ret = ptp_parse_args(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Error with PTP initialization\n");
    /* >8 End of parsing specific arguments. */
 
    /* Check that there is an even number of ports to send/receive on. */
    nb_ports = rte_eth_dev_count_avail();
 
    /* Creates a new mempool in memory to hold the mbufs. 8< */
    mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS * nb_ports,
        MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
    /* >8 End of a new mempool in memory to hold the mbufs. */
 
    if (mbuf_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
 
    /* Initialize all ports. 8< */
    RTE_ETH_FOREACH_DEV(portid) {
        if ((ptp_enabled_port_mask & (1 << portid)) != 0) {
            if (port_init(portid, mbuf_pool) == 0) {
                ptp_enabled_ports[ptp_enabled_port_nb] = portid;
                ptp_enabled_port_nb++;
            } else {
                rte_exit(EXIT_FAILURE,
                     "Cannot init port %"PRIu8 "\n",
                     portid);
            }
        } else
            printf("Skipping disabled port %u\n", portid);
    }
    /* >8 End of initialization of all ports. */
 
    if (ptp_enabled_port_nb == 0) {
        rte_exit(EXIT_FAILURE,
            "All available ports are disabled."
            " Please set portmask.\n");
    }
 
    if (rte_lcore_count() > 1)
        printf("\nWARNING: Too many lcores enabled. Only 1 used.\n");
 
    /* Call lcore_main on the main core only. */
    lcore_main();
 
    /* clean up the EAL */
    rte_eal_cleanup();
 
    return 0;
}