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

#include <stdint.h>
#include <inttypes.h>
#include <getopt.h>

#include <rte_eal.h>
#include <rte_ethdev.h>
#include <rte_cycles.h>
#include <rte_lcore.h>
#include <rte_mbuf.h>
#include <rte_flow.h>
#include <rte_flow_classify.h>
#include <rte_table_acl.h>

#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024

#define NUM_MBUFS 8191
#define MBUF_CACHE_SIZE 250
#define BURST_SIZE 32

#define MAX_NUM_CLASSIFY 30
#define FLOW_CLASSIFY_MAX_RULE_NUM 91
#define FLOW_CLASSIFY_MAX_PRIORITY 8
#define FLOW_CLASSIFIER_NAME_SIZE 64

#define COMMENT_LEAD_CHAR       ('#')
#define OPTION_RULE_IPV4        "rule_ipv4"
#define RTE_LOGTYPE_FLOW_CLASSIFY       RTE_LOGTYPE_USER3
#define flow_classify_log(format, ...) \
                RTE_LOG(ERR, FLOW_CLASSIFY, format, ##__VA_ARGS__)

#define uint32_t_to_char(ip, a, b, c, d) do {\
                *a = (unsigned char)(ip >> 24 & 0xff);\
                *b = (unsigned char)(ip >> 16 & 0xff);\
                *c = (unsigned char)(ip >> 8 & 0xff);\
                *d = (unsigned char)(ip & 0xff);\
        } while (0)

enum {
        CB_FLD_SRC_ADDR,
        CB_FLD_DST_ADDR,
        CB_FLD_SRC_PORT,
        CB_FLD_SRC_PORT_DLM,
        CB_FLD_SRC_PORT_MASK,
        CB_FLD_DST_PORT,
        CB_FLD_DST_PORT_DLM,
        CB_FLD_DST_PORT_MASK,
        CB_FLD_PROTO,
        CB_FLD_PRIORITY,
        CB_FLD_NUM,
};

static struct{
        const char *rule_ipv4_name;
} parm_config;
const char cb_port_delim[] = ":";

/* Creation of flow classifier object. 8< */
struct flow_classifier {
        struct rte_flow_classifier *cls;
};

struct flow_classifier_acl {
        struct flow_classifier cls;
} __rte_cache_aligned;
/* >8 End of creation of flow classifier object. */

/*  Creation of ACL table during initialization of application. 8< */

/* ACL field definitions for IPv4 5 tuple rule */
enum {
        PROTO_FIELD_IPV4,
        SRC_FIELD_IPV4,
        DST_FIELD_IPV4,
        SRCP_FIELD_IPV4,
        DSTP_FIELD_IPV4,
        NUM_FIELDS_IPV4
};

enum {
        PROTO_INPUT_IPV4,
        SRC_INPUT_IPV4,
        DST_INPUT_IPV4,
        SRCP_DESTP_INPUT_IPV4
};

static struct rte_acl_field_def ipv4_defs[NUM_FIELDS_IPV4] = {
        /* first input field - always one byte long. */
        {
                .type = RTE_ACL_FIELD_TYPE_BITMASK,
                .size = sizeof(uint8_t),
                .field_index = PROTO_FIELD_IPV4,
                .input_index = PROTO_INPUT_IPV4,
                .offset = sizeof(struct rte_ether_hdr) +
                        offsetof(struct rte_ipv4_hdr, next_proto_id),
        },
        /* next input field (IPv4 source address) - 4 consecutive bytes. */
        {
                /* rte_flow uses a bit mask for IPv4 addresses */
                .type = RTE_ACL_FIELD_TYPE_BITMASK,
                .size = sizeof(uint32_t),
                .field_index = SRC_FIELD_IPV4,
                .input_index = SRC_INPUT_IPV4,
                .offset = sizeof(struct rte_ether_hdr) +
                        offsetof(struct rte_ipv4_hdr, src_addr),
        },
        /* next input field (IPv4 destination address) - 4 consecutive bytes. */
        {
                /* rte_flow uses a bit mask for IPv4 addresses */
                .type = RTE_ACL_FIELD_TYPE_BITMASK,
                .size = sizeof(uint32_t),
                .field_index = DST_FIELD_IPV4,
                .input_index = DST_INPUT_IPV4,
                .offset = sizeof(struct rte_ether_hdr) +
                        offsetof(struct rte_ipv4_hdr, dst_addr),
        },
        /*
         * Next 2 fields (src & dst ports) form 4 consecutive bytes.
         * They share the same input index.
         */
        {
                /* rte_flow uses a bit mask for protocol ports */
                .type = RTE_ACL_FIELD_TYPE_BITMASK,
                .size = sizeof(uint16_t),
                .field_index = SRCP_FIELD_IPV4,
                .input_index = SRCP_DESTP_INPUT_IPV4,
                .offset = sizeof(struct rte_ether_hdr) +
                        sizeof(struct rte_ipv4_hdr) +
                        offsetof(struct rte_tcp_hdr, src_port),
        },
        {
                /* rte_flow uses a bit mask for protocol ports */
                .type = RTE_ACL_FIELD_TYPE_BITMASK,
                .size = sizeof(uint16_t),
                .field_index = DSTP_FIELD_IPV4,
                .input_index = SRCP_DESTP_INPUT_IPV4,
                .offset = sizeof(struct rte_ether_hdr) +
                        sizeof(struct rte_ipv4_hdr) +
                        offsetof(struct rte_tcp_hdr, dst_port),
        },
};
/* >8 End of creation of ACL table. */

/* Flow classify data. 8< */
static int num_classify_rules;
static struct rte_flow_classify_rule *rules[MAX_NUM_CLASSIFY];
static struct rte_flow_classify_ipv4_5tuple_stats ntuple_stats;
static struct rte_flow_classify_stats classify_stats = {
                .stats = (void **)&ntuple_stats
};
/* >8 End of flow classify data. */

/* parameters for rte_flow_classify_validate and
 * rte_flow_classify_table_entry_add functions
 */

static struct rte_flow_item  eth_item = { RTE_FLOW_ITEM_TYPE_ETH,
        0, 0, 0 };
static struct rte_flow_item  end_item = { RTE_FLOW_ITEM_TYPE_END,
        0, 0, 0 };

/* sample actions:
 * "actions count / end"
 */
struct rte_flow_query_count count = {
        .reset = 1,
        .hits_set = 1,
        .bytes_set = 1,
        .hits = 0,
        .bytes = 0,
};
static struct rte_flow_action count_action = { RTE_FLOW_ACTION_TYPE_COUNT,
        &count};
static struct rte_flow_action end_action = { RTE_FLOW_ACTION_TYPE_END, 0};
static struct rte_flow_action actions[2];

/* sample attributes */
static struct rte_flow_attr attr;

/* flow_classify.c: * Based on DPDK skeleton forwarding example. */

/*
 * Initializes a given port using global settings and with the RX buffers
 * coming from the mbuf_pool passed as a parameter.
 */

/* Initializing port using global settings. 8< */
static inline int
port_init(uint8_t port, struct rte_mempool *mbuf_pool)
{
        struct rte_eth_conf port_conf;
        struct rte_ether_addr addr;
        const uint16_t rx_rings = 1, tx_rings = 1;
        int retval;
        uint16_t q;
        struct rte_eth_dev_info dev_info;
        struct rte_eth_txconf txconf;

        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.tx_offload_capa & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE)
                port_conf.txmode.offloads |=
                        RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE;

        /* Configure the Ethernet device. */
        retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
        if (retval != 0)
                return retval;

        /* Allocate and set up 1 RX queue per Ethernet port. */
        for (q = 0; q < rx_rings; q++) {
                retval = rte_eth_rx_queue_setup(port, q, RX_RING_SIZE,
                                rte_eth_dev_socket_id(port), NULL, mbuf_pool);
                if (retval < 0)
                        return retval;
        }

        txconf = dev_info.default_txconf;
        txconf.offloads = port_conf.txmode.offloads;
        /* Allocate and set up 1 TX queue per Ethernet port. */
        for (q = 0; q < tx_rings; q++) {
                retval = rte_eth_tx_queue_setup(port, q, TX_RING_SIZE,
                                rte_eth_dev_socket_id(port), &txconf);
                if (retval < 0)
                        return retval;
        }

        /* Start the Ethernet port. 8< */
        retval = rte_eth_dev_start(port);
        /* >8 End of starting the Ethernet port. */
        if (retval < 0)
                return retval;

        /* Display the port MAC address. */
        retval = rte_eth_macaddr_get(port, &addr);
        if (retval != 0)
                return retval;

        printf("Port %u MAC: %02" PRIx8 " %02" PRIx8 " %02" PRIx8
                           " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 "\n",
                        port, RTE_ETHER_ADDR_BYTES(&addr));

        /* Enable RX in promiscuous mode for the Ethernet device. */
        retval = rte_eth_promiscuous_enable(port);
        if (retval != 0)
                return retval;

        return 0;
}
/* >8 End of initializing a given port. */

/*
 * The lcore main. This is the main thread that does the work, reading from
 * an input port classifying the packets and writing to an output port.
 */

/* Classifying the packets. 8< */
static __rte_noreturn void
lcore_main(struct flow_classifier *cls_app)
{
        uint16_t port;
        int ret;
        int i = 0;

        ret = rte_flow_classify_table_entry_delete(cls_app->cls,
                        rules[7]);
        if (ret)
                printf("table_entry_delete failed [7] %d\n\n", ret);
        else
                printf("table_entry_delete succeeded [7]\n\n");

        /*
         * Check that the port is on the same NUMA node as the polling thread
         * for best performance.
         */
        RTE_ETH_FOREACH_DEV(port)
                if (rte_eth_dev_socket_id(port) >= 0 &&
                        rte_eth_dev_socket_id(port) != (int)rte_socket_id()) {
                        printf("\n\n");
                        printf("WARNING: port %u is on remote NUMA node\n",
                               port);
                        printf("to polling thread.\n");
                        printf("Performance will not be optimal.\n");
                }
        printf("\nCore %u forwarding packets. ", rte_lcore_id());
        printf("[Ctrl+C to quit]\n");

        /* Run until the application is quit or killed. 8< */
        for (;;) {
                /*
                 * Receive packets on a port, classify them and forward them
                 * on the paired port.
                 * The mapping is 0 -> 1, 1 -> 0, 2 -> 3, 3 -> 2, etc.
                 */
                RTE_ETH_FOREACH_DEV(port) {
                        /* Get burst of RX packets, from first port of pair. */
                        struct rte_mbuf *bufs[BURST_SIZE];
                        const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
                                        bufs, BURST_SIZE);

                        if (unlikely(nb_rx == 0))
                                continue;

                        for (i = 0; i < MAX_NUM_CLASSIFY; i++) {
                                if (rules[i]) {
                                        ret = rte_flow_classifier_query(
                                                cls_app->cls,
                                                bufs, nb_rx, rules[i],
                                                &classify_stats);
                                        if (ret)
                                                printf(
                                                        "rule [%d] query failed ret [%d]\n\n",
                                                        i, ret);
                                        else {
                                                printf(
                                                "rule[%d] count=%"PRIu64"\n",
                                                i, ntuple_stats.counter1);

                                                printf("proto = %d\n",
                                                ntuple_stats.ipv4_5tuple.proto);
                                        }
                                }
                        }

                        /* Send burst of TX packets, to second port of pair. */
                        const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
                                        bufs, nb_rx);

                        /* Free any unsent packets. */
                        if (unlikely(nb_tx < nb_rx)) {
                                uint16_t buf;

                                for (buf = nb_tx; buf < nb_rx; buf++)
                                        rte_pktmbuf_free(bufs[buf]);
                        }
                }
        }
        /* >8 End of main loop. */
}
/* >8 End of lcore main. */

/*
 * Parse IPv4 5 tuple rules file, ipv4_rules_file.txt.
 * Expected format:
 * <src_ipv4_addr>'/'<masklen> <space> \
 * <dst_ipv4_addr>'/'<masklen> <space> \
 * <src_port> <space> ":" <src_port_mask> <space> \
 * <dst_port> <space> ":" <dst_port_mask> <space> \
 * <proto>'/'<proto_mask> <space> \
 * <priority>
 */

static int
get_cb_field(char **in, uint32_t *fd, int base, unsigned long lim,
                char dlm)
{
        unsigned long val;
        char *end;

        errno = 0;
        val = strtoul(*in, &end, base);
        if (errno != 0 || end[0] != dlm || val > lim)
                return -EINVAL;
        *fd = (uint32_t)val;
        *in = end + 1;
        return 0;
}

static int
parse_ipv4_net(char *in, uint32_t *addr, uint32_t *mask_len)
{
        uint32_t a, b, c, d, m;

        if (get_cb_field(&in, &a, 0, UINT8_MAX, '.'))
                return -EINVAL;
        if (get_cb_field(&in, &b, 0, UINT8_MAX, '.'))
                return -EINVAL;
        if (get_cb_field(&in, &c, 0, UINT8_MAX, '.'))
                return -EINVAL;
        if (get_cb_field(&in, &d, 0, UINT8_MAX, '/'))
                return -EINVAL;
        if (get_cb_field(&in, &m, 0, sizeof(uint32_t) * CHAR_BIT, 0))
                return -EINVAL;

        addr[0] = RTE_IPV4(a, b, c, d);
        mask_len[0] = m;
        return 0;
}

static int
parse_ipv4_5tuple_rule(char *str, struct rte_eth_ntuple_filter *ntuple_filter)
{
        int i, ret;
        char *s, *sp, *in[CB_FLD_NUM];
        static const char *dlm = " \t\n";
        int dim = CB_FLD_NUM;
        uint32_t temp;

        s = str;
        for (i = 0; i != dim; i++, s = NULL) {
                in[i] = strtok_r(s, dlm, &sp);
                if (in[i] == NULL)
                        return -EINVAL;
        }

        ret = parse_ipv4_net(in[CB_FLD_SRC_ADDR],
                        &ntuple_filter->src_ip,
                        &ntuple_filter->src_ip_mask);
        if (ret != 0) {
                flow_classify_log("failed to read source address/mask: %s\n",
                        in[CB_FLD_SRC_ADDR]);
                return ret;
        }

        ret = parse_ipv4_net(in[CB_FLD_DST_ADDR],
                        &ntuple_filter->dst_ip,
                        &ntuple_filter->dst_ip_mask);
        if (ret != 0) {
                flow_classify_log("failed to read source address/mask: %s\n",
                        in[CB_FLD_DST_ADDR]);
                return ret;
        }

        if (get_cb_field(&in[CB_FLD_SRC_PORT], &temp, 0, UINT16_MAX, 0))
                return -EINVAL;
        ntuple_filter->src_port = (uint16_t)temp;

        if (strncmp(in[CB_FLD_SRC_PORT_DLM], cb_port_delim,
                        sizeof(cb_port_delim)) != 0)
                return -EINVAL;

        if (get_cb_field(&in[CB_FLD_SRC_PORT_MASK], &temp, 0, UINT16_MAX, 0))
                return -EINVAL;
        ntuple_filter->src_port_mask = (uint16_t)temp;

        if (get_cb_field(&in[CB_FLD_DST_PORT], &temp, 0, UINT16_MAX, 0))
                return -EINVAL;
        ntuple_filter->dst_port = (uint16_t)temp;

        if (strncmp(in[CB_FLD_DST_PORT_DLM], cb_port_delim,
                        sizeof(cb_port_delim)) != 0)
                return -EINVAL;

        if (get_cb_field(&in[CB_FLD_DST_PORT_MASK], &temp, 0, UINT16_MAX, 0))
                return -EINVAL;
        ntuple_filter->dst_port_mask = (uint16_t)temp;

        if (get_cb_field(&in[CB_FLD_PROTO], &temp, 0, UINT8_MAX, '/'))
                return -EINVAL;
        ntuple_filter->proto = (uint8_t)temp;

        if (get_cb_field(&in[CB_FLD_PROTO], &temp, 0, UINT8_MAX, 0))
                return -EINVAL;
        ntuple_filter->proto_mask = (uint8_t)temp;

        if (get_cb_field(&in[CB_FLD_PRIORITY], &temp, 0, UINT16_MAX, 0))
                return -EINVAL;
        ntuple_filter->priority = (uint16_t)temp;
        if (ntuple_filter->priority > FLOW_CLASSIFY_MAX_PRIORITY)
                ret = -EINVAL;

        return ret;
}

/* Bypass comment and empty lines */
static inline int
is_bypass_line(char *buff)
{
        int i = 0;

        /* comment line */
        if (buff[0] == COMMENT_LEAD_CHAR)
                return 1;
        /* empty line */
        while (buff[i] != '\0') {
                if (!isspace(buff[i]))
                        return 0;
                i++;
        }
        return 1;
}

static uint32_t
convert_depth_to_bitmask(uint32_t depth_val)
{
        uint32_t bitmask = 0;
        int i, j;

        for (i = depth_val, j = 0; i > 0; i--, j++)
                bitmask |= (1 << (31 - j));
        return bitmask;
}

static int
add_classify_rule(struct rte_eth_ntuple_filter *ntuple_filter,
                struct flow_classifier *cls_app)
{
        int ret = -1;
        int key_found;
        struct rte_flow_error error;
        struct rte_flow_item_ipv4 ipv4_spec;
        struct rte_flow_item_ipv4 ipv4_mask;
        struct rte_flow_item ipv4_udp_item;
        struct rte_flow_item ipv4_tcp_item;
        struct rte_flow_item ipv4_sctp_item;
        struct rte_flow_item_udp udp_spec;
        struct rte_flow_item_udp udp_mask;
        struct rte_flow_item udp_item;
        struct rte_flow_item_tcp tcp_spec;
        struct rte_flow_item_tcp tcp_mask;
        struct rte_flow_item tcp_item;
        struct rte_flow_item_sctp sctp_spec;
        struct rte_flow_item_sctp sctp_mask;
        struct rte_flow_item sctp_item;
        struct rte_flow_item pattern_ipv4_5tuple[4];
        struct rte_flow_classify_rule *rule;
        uint8_t ipv4_proto;

        if (num_classify_rules >= MAX_NUM_CLASSIFY) {
                printf(
                        "\nINFO:  classify rule capacity %d reached\n",
                        num_classify_rules);
                return ret;
        }

        /* set up parameters for validate and add */
        memset(&ipv4_spec, 0, sizeof(ipv4_spec));
        ipv4_spec.hdr.next_proto_id = ntuple_filter->proto;
        ipv4_spec.hdr.src_addr = ntuple_filter->src_ip;
        ipv4_spec.hdr.dst_addr = ntuple_filter->dst_ip;
        ipv4_proto = ipv4_spec.hdr.next_proto_id;

        memset(&ipv4_mask, 0, sizeof(ipv4_mask));
        ipv4_mask.hdr.next_proto_id = ntuple_filter->proto_mask;
        ipv4_mask.hdr.src_addr = ntuple_filter->src_ip_mask;
        ipv4_mask.hdr.src_addr =
                convert_depth_to_bitmask(ipv4_mask.hdr.src_addr);
        ipv4_mask.hdr.dst_addr = ntuple_filter->dst_ip_mask;
        ipv4_mask.hdr.dst_addr =
                convert_depth_to_bitmask(ipv4_mask.hdr.dst_addr);

        switch (ipv4_proto) {
        case IPPROTO_UDP:
                ipv4_udp_item.type = RTE_FLOW_ITEM_TYPE_IPV4;
                ipv4_udp_item.spec = &ipv4_spec;
                ipv4_udp_item.mask = &ipv4_mask;
                ipv4_udp_item.last = NULL;

                udp_spec.hdr.src_port = ntuple_filter->src_port;
                udp_spec.hdr.dst_port = ntuple_filter->dst_port;
                udp_spec.hdr.dgram_len = 0;
                udp_spec.hdr.dgram_cksum = 0;

                udp_mask.hdr.src_port = ntuple_filter->src_port_mask;
                udp_mask.hdr.dst_port = ntuple_filter->dst_port_mask;
                udp_mask.hdr.dgram_len = 0;
                udp_mask.hdr.dgram_cksum = 0;

                udp_item.type = RTE_FLOW_ITEM_TYPE_UDP;
                udp_item.spec = &udp_spec;
                udp_item.mask = &udp_mask;
                udp_item.last = NULL;

                attr.priority = ntuple_filter->priority;
                pattern_ipv4_5tuple[1] = ipv4_udp_item;
                pattern_ipv4_5tuple[2] = udp_item;
                break;
        case IPPROTO_TCP:
                ipv4_tcp_item.type = RTE_FLOW_ITEM_TYPE_IPV4;
                ipv4_tcp_item.spec = &ipv4_spec;
                ipv4_tcp_item.mask = &ipv4_mask;
                ipv4_tcp_item.last = NULL;

                memset(&tcp_spec, 0, sizeof(tcp_spec));
                tcp_spec.hdr.src_port = ntuple_filter->src_port;
                tcp_spec.hdr.dst_port = ntuple_filter->dst_port;

                memset(&tcp_mask, 0, sizeof(tcp_mask));
                tcp_mask.hdr.src_port = ntuple_filter->src_port_mask;
                tcp_mask.hdr.dst_port = ntuple_filter->dst_port_mask;

                tcp_item.type = RTE_FLOW_ITEM_TYPE_TCP;
                tcp_item.spec = &tcp_spec;
                tcp_item.mask = &tcp_mask;
                tcp_item.last = NULL;

                attr.priority = ntuple_filter->priority;
                pattern_ipv4_5tuple[1] = ipv4_tcp_item;
                pattern_ipv4_5tuple[2] = tcp_item;
                break;
        case IPPROTO_SCTP:
                ipv4_sctp_item.type = RTE_FLOW_ITEM_TYPE_IPV4;
                ipv4_sctp_item.spec = &ipv4_spec;
                ipv4_sctp_item.mask = &ipv4_mask;
                ipv4_sctp_item.last = NULL;

                sctp_spec.hdr.src_port = ntuple_filter->src_port;
                sctp_spec.hdr.dst_port = ntuple_filter->dst_port;
                sctp_spec.hdr.cksum = 0;
                sctp_spec.hdr.tag = 0;

                sctp_mask.hdr.src_port = ntuple_filter->src_port_mask;
                sctp_mask.hdr.dst_port = ntuple_filter->dst_port_mask;
                sctp_mask.hdr.cksum = 0;
                sctp_mask.hdr.tag = 0;

                sctp_item.type = RTE_FLOW_ITEM_TYPE_SCTP;
                sctp_item.spec = &sctp_spec;
                sctp_item.mask = &sctp_mask;
                sctp_item.last = NULL;

                attr.priority = ntuple_filter->priority;
                pattern_ipv4_5tuple[1] = ipv4_sctp_item;
                pattern_ipv4_5tuple[2] = sctp_item;
                break;
        default:
                return ret;
        }

        attr.ingress = 1;
        pattern_ipv4_5tuple[0] = eth_item;
        pattern_ipv4_5tuple[3] = end_item;
        actions[0] = count_action;
        actions[1] = end_action;

        /* Validate and add rule */
        ret = rte_flow_classify_validate(cls_app->cls, &attr,
                        pattern_ipv4_5tuple, actions, &error);
        if (ret) {
                printf("table entry validate failed ipv4_proto = %u\n",
                        ipv4_proto);
                return ret;
        }

        rule = rte_flow_classify_table_entry_add(
                        cls_app->cls, &attr, pattern_ipv4_5tuple,
                        actions, &key_found, &error);
        if (rule == NULL) {
                printf("table entry add failed ipv4_proto = %u\n",
                        ipv4_proto);
                ret = -1;
                return ret;
        }

        rules[num_classify_rules] = rule;
        num_classify_rules++;
        return 0;
}

/* Reads file and calls the add_classify_rule function. 8< */
static int
add_rules(const char *rule_path, struct flow_classifier *cls_app)
{
        FILE *fh;
        char buff[LINE_MAX];
        unsigned int i = 0;
        unsigned int total_num = 0;
        struct rte_eth_ntuple_filter ntuple_filter;
        int ret;

        fh = fopen(rule_path, "rb");
        if (fh == NULL)
                rte_exit(EXIT_FAILURE, "%s: fopen %s failed\n", __func__,
                        rule_path);

        ret = fseek(fh, 0, SEEK_SET);
        if (ret)
                rte_exit(EXIT_FAILURE, "%s: fseek %d failed\n", __func__,
                        ret);

        i = 0;
        while (fgets(buff, LINE_MAX, fh) != NULL) {
                i++;

                if (is_bypass_line(buff))
                        continue;

                if (total_num >= FLOW_CLASSIFY_MAX_RULE_NUM - 1) {
                        printf("\nINFO: classify rule capacity %d reached\n",
                                total_num);
                        break;
                }

                if (parse_ipv4_5tuple_rule(buff, &ntuple_filter) != 0)
                        rte_exit(EXIT_FAILURE,
                                "%s Line %u: parse rules error\n",
                                rule_path, i);

                if (add_classify_rule(&ntuple_filter, cls_app) != 0)
                        rte_exit(EXIT_FAILURE, "add rule error\n");

                total_num++;
        }

        fclose(fh);
        return 0;
}
/* >8 End of add_rules. */

/* display usage */
static void
print_usage(const char *prgname)
{
        printf("%s usage:\n", prgname);
        printf("[EAL options] --  --"OPTION_RULE_IPV4"=FILE: ");
        printf("specify the ipv4 rules file.\n");
        printf("Each rule occupies one line in the file.\n");
}

/* Parse the argument given in the command line of the application */
static int
parse_args(int argc, char **argv)
{
        int opt, ret;
        char **argvopt;
        int option_index;
        char *prgname = argv[0];
        static struct option lgopts[] = {
                {OPTION_RULE_IPV4, 1, 0, 0},
                {NULL, 0, 0, 0}
        };

        argvopt = argv;

        while ((opt = getopt_long(argc, argvopt, "",
                                lgopts, &option_index)) != EOF) {

                switch (opt) {
                /* long options */
                case 0:
                        if (!strncmp(lgopts[option_index].name,
                                        OPTION_RULE_IPV4,
                                        sizeof(OPTION_RULE_IPV4)))
                                parm_config.rule_ipv4_name = optarg;
                        break;
                default:
                        print_usage(prgname);
                        return -1;
                }
        }

        if (optind >= 0)
                argv[optind-1] = prgname;

        ret = optind-1;
        optind = 1; /* reset getopt lib */
        return ret;
}

/*
 * The main function, which does initialization and calls the lcore_main
 * function.
 */
int
main(int argc, char *argv[])
{
        struct rte_mempool *mbuf_pool;
        uint16_t nb_ports;
        uint16_t portid;
        int ret;
        int socket_id;
        struct rte_table_acl_params table_acl_params;
        struct rte_flow_classify_table_params cls_table_params;
        struct flow_classifier *cls_app;
        struct rte_flow_classifier_params cls_params;
        uint32_t size;

        /* Initialize the Environment Abstraction Layer (EAL). 8< */
        ret = rte_eal_init(argc, argv);
        if (ret < 0)
                rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
        /* >8 End of initialization of EAL. */

        argc -= ret;
        argv += ret;

        /* Parse application arguments (after the EAL ones). 8< */
        ret = parse_args(argc, argv);
        if (ret < 0)
                rte_exit(EXIT_FAILURE, "Invalid flow_classify parameters\n");
        /* >8 End of parse application arguments. */

        /* Check that there is an even number of ports to send/receive on. */
        nb_ports = rte_eth_dev_count_avail();
        if (nb_ports < 2 || (nb_ports & 1))
                rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");

        /* 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 creation of new mempool in memory. */

        if (mbuf_pool == NULL)
                rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");

        /* Initialize all ports. 8< */
        RTE_ETH_FOREACH_DEV(portid)
                if (port_init(portid, mbuf_pool) != 0)
                        rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu8 "\n",
                                        portid);
        /* >8 End of initialization of all ports. */

        if (rte_lcore_count() > 1)
                printf("\nWARNING: Too many lcores enabled. Only 1 used.\n");

        socket_id = rte_eth_dev_socket_id(0);

        /* Memory allocation. 8< */
        size = RTE_CACHE_LINE_ROUNDUP(sizeof(struct flow_classifier_acl));
        cls_app = rte_zmalloc(NULL, size, RTE_CACHE_LINE_SIZE);
        if (cls_app == NULL)
                rte_exit(EXIT_FAILURE, "Cannot allocate classifier memory\n");

        cls_params.name = "flow_classifier";
        cls_params.socket_id = socket_id;

        cls_app->cls = rte_flow_classifier_create(&cls_params);
        if (cls_app->cls == NULL) {
                rte_free(cls_app);
                rte_exit(EXIT_FAILURE, "Cannot create classifier\n");
        }

        /* initialise ACL table params */
        table_acl_params.name = "table_acl_ipv4_5tuple";
        table_acl_params.n_rules = FLOW_CLASSIFY_MAX_RULE_NUM;
        table_acl_params.n_rule_fields = RTE_DIM(ipv4_defs);
        memcpy(table_acl_params.field_format, ipv4_defs, sizeof(ipv4_defs));

        /* initialise table create params */
        cls_table_params.ops = &rte_table_acl_ops;
        cls_table_params.arg_create = &table_acl_params;
        cls_table_params.type = RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_5TUPLE;

        ret = rte_flow_classify_table_create(cls_app->cls, &cls_table_params);
        if (ret) {
                rte_flow_classifier_free(cls_app->cls);
                rte_free(cls_app);
                rte_exit(EXIT_FAILURE, "Failed to create classifier table\n");
        }
        /* >8 End of initialization of table create params. */

        /* read file of IPv4 5 tuple rules and initialize parameters
         * for rte_flow_classify_validate and rte_flow_classify_table_entry_add
         * API's.
         */

        /* Read file of IPv4 tuple rules. 8< */
        if (add_rules(parm_config.rule_ipv4_name, cls_app)) {
                rte_flow_classifier_free(cls_app->cls);
                rte_free(cls_app);
                rte_exit(EXIT_FAILURE, "Failed to add rules\n");
        }
        /* >8 End of reading file of IPv4 5 tuple rules. */

        /* Call lcore_main on the main core only. */
        lcore_main(cls_app);

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

        return 0;
}