examples/l3fwd/l3fwd_em.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2016 Intel Corporation
 */

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

#include <rte_debug.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_cycles.h>
#include <rte_mbuf.h>
#include <rte_ip.h>
#include <rte_tcp.h>
#include <rte_udp.h>
#include <rte_hash.h>

#include "l3fwd.h"

#if defined(RTE_ARCH_X86) || defined(RTE_MACHINE_CPUFLAG_CRC32)
#define EM_HASH_CRC 1
#endif

#ifdef EM_HASH_CRC
#include <rte_hash_crc.h>
#define DEFAULT_HASH_FUNC       rte_hash_crc
#else
#include <rte_jhash.h>
#define DEFAULT_HASH_FUNC       rte_jhash
#endif

#define IPV6_ADDR_LEN 16

struct ipv4_5tuple {
    uint32_t ip_dst;
    uint32_t ip_src;
    uint16_t port_dst;
    uint16_t port_src;
    uint8_t  proto;
} __attribute__((__packed__));

union ipv4_5tuple_host {
    struct {
        uint8_t  pad0;
        uint8_t  proto;
        uint16_t pad1;
        uint32_t ip_src;
        uint32_t ip_dst;
        uint16_t port_src;
        uint16_t port_dst;
    };
    xmm_t xmm;
};

#define XMM_NUM_IN_IPV6_5TUPLE 3

struct ipv6_5tuple {
    uint8_t  ip_dst[IPV6_ADDR_LEN];
    uint8_t  ip_src[IPV6_ADDR_LEN];
    uint16_t port_dst;
    uint16_t port_src;
    uint8_t  proto;
} __attribute__((__packed__));

union ipv6_5tuple_host {
    struct {
        uint16_t pad0;
        uint8_t  proto;
        uint8_t  pad1;
        uint8_t  ip_src[IPV6_ADDR_LEN];
        uint8_t  ip_dst[IPV6_ADDR_LEN];
        uint16_t port_src;
        uint16_t port_dst;
        uint64_t reserve;
    };
    xmm_t xmm[XMM_NUM_IN_IPV6_5TUPLE];
};



struct ipv4_l3fwd_em_route {
    struct ipv4_5tuple key;
    uint8_t if_out;
};

struct ipv6_l3fwd_em_route {
    struct ipv6_5tuple key;
    uint8_t if_out;
};

static struct ipv4_l3fwd_em_route ipv4_l3fwd_em_route_array[] = {
    {{RTE_IPV4(101, 0, 0, 0), RTE_IPV4(100, 10, 0, 1),  101, 11, IPPROTO_TCP}, 0},
    {{RTE_IPV4(201, 0, 0, 0), RTE_IPV4(200, 20, 0, 1),  102, 12, IPPROTO_TCP}, 1},
    {{RTE_IPV4(111, 0, 0, 0), RTE_IPV4(100, 30, 0, 1),  101, 11, IPPROTO_TCP}, 2},
    {{RTE_IPV4(211, 0, 0, 0), RTE_IPV4(200, 40, 0, 1),  102, 12, IPPROTO_TCP}, 3},
};

static struct ipv6_l3fwd_em_route ipv6_l3fwd_em_route_array[] = {
    {{
    {0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0x02, 0x1e, 0x67, 0xff, 0xfe, 0, 0, 0},
    {0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0x02, 0x1b, 0x21, 0xff, 0xfe, 0x91, 0x38, 0x05},
    101, 11, IPPROTO_TCP}, 0},

    {{
    {0xfe, 0x90, 0, 0, 0, 0, 0, 0, 0x02, 0x1e, 0x67, 0xff, 0xfe, 0, 0, 0},
    {0xfe, 0x90, 0, 0, 0, 0, 0, 0, 0x02, 0x1b, 0x21, 0xff, 0xfe, 0x91, 0x38, 0x05},
    102, 12, IPPROTO_TCP}, 1},

    {{
    {0xfe, 0xa0, 0, 0, 0, 0, 0, 0, 0x02, 0x1e, 0x67, 0xff, 0xfe, 0, 0, 0},
    {0xfe, 0xa0, 0, 0, 0, 0, 0, 0, 0x02, 0x1b, 0x21, 0xff, 0xfe, 0x91, 0x38, 0x05},
    101, 11, IPPROTO_TCP}, 2},

    {{
    {0xfe, 0xb0, 0, 0, 0, 0, 0, 0, 0x02, 0x1e, 0x67, 0xff, 0xfe, 0, 0, 0},
    {0xfe, 0xb0, 0, 0, 0, 0, 0, 0, 0x02, 0x1b, 0x21, 0xff, 0xfe, 0x91, 0x38, 0x05},
    102, 12, IPPROTO_TCP}, 3},
};

struct rte_hash *ipv4_l3fwd_em_lookup_struct[NB_SOCKETS];
struct rte_hash *ipv6_l3fwd_em_lookup_struct[NB_SOCKETS];

static inline uint32_t
ipv4_hash_crc(const void *data, __rte_unused uint32_t data_len,
        uint32_t init_val)
{
    const union ipv4_5tuple_host *k;
    uint32_t t;
    const uint32_t *p;

    k = data;
    t = k->proto;
    p = (const uint32_t *)&k->port_src;

#ifdef EM_HASH_CRC
    init_val = rte_hash_crc_4byte(t, init_val);
    init_val = rte_hash_crc_4byte(k->ip_src, init_val);
    init_val = rte_hash_crc_4byte(k->ip_dst, init_val);
    init_val = rte_hash_crc_4byte(*p, init_val);
#else
    init_val = rte_jhash_1word(t, init_val);
    init_val = rte_jhash_1word(k->ip_src, init_val);
    init_val = rte_jhash_1word(k->ip_dst, init_val);
    init_val = rte_jhash_1word(*p, init_val);
#endif

    return init_val;
}

static inline uint32_t
ipv6_hash_crc(const void *data, __rte_unused uint32_t data_len,
        uint32_t init_val)
{
    const union ipv6_5tuple_host *k;
    uint32_t t;
    const uint32_t *p;
#ifdef EM_HASH_CRC
    const uint32_t  *ip_src0, *ip_src1, *ip_src2, *ip_src3;
    const uint32_t  *ip_dst0, *ip_dst1, *ip_dst2, *ip_dst3;
#endif

    k = data;
    t = k->proto;
    p = (const uint32_t *)&k->port_src;

#ifdef EM_HASH_CRC
    ip_src0 = (const uint32_t *) k->ip_src;
    ip_src1 = (const uint32_t *)(k->ip_src+4);
    ip_src2 = (const uint32_t *)(k->ip_src+8);
    ip_src3 = (const uint32_t *)(k->ip_src+12);
    ip_dst0 = (const uint32_t *) k->ip_dst;
    ip_dst1 = (const uint32_t *)(k->ip_dst+4);
    ip_dst2 = (const uint32_t *)(k->ip_dst+8);
    ip_dst3 = (const uint32_t *)(k->ip_dst+12);
    init_val = rte_hash_crc_4byte(t, init_val);
    init_val = rte_hash_crc_4byte(*ip_src0, init_val);
    init_val = rte_hash_crc_4byte(*ip_src1, init_val);
    init_val = rte_hash_crc_4byte(*ip_src2, init_val);
    init_val = rte_hash_crc_4byte(*ip_src3, init_val);
    init_val = rte_hash_crc_4byte(*ip_dst0, init_val);
    init_val = rte_hash_crc_4byte(*ip_dst1, init_val);
    init_val = rte_hash_crc_4byte(*ip_dst2, init_val);
    init_val = rte_hash_crc_4byte(*ip_dst3, init_val);
    init_val = rte_hash_crc_4byte(*p, init_val);
#else
    init_val = rte_jhash_1word(t, init_val);
    init_val = rte_jhash(k->ip_src,
            sizeof(uint8_t) * IPV6_ADDR_LEN, init_val);
    init_val = rte_jhash(k->ip_dst,
            sizeof(uint8_t) * IPV6_ADDR_LEN, init_val);
    init_val = rte_jhash_1word(*p, init_val);
#endif
    return init_val;
}

#define IPV4_L3FWD_EM_NUM_ROUTES \
    (sizeof(ipv4_l3fwd_em_route_array) / sizeof(ipv4_l3fwd_em_route_array[0]))

#define IPV6_L3FWD_EM_NUM_ROUTES \
    (sizeof(ipv6_l3fwd_em_route_array) / sizeof(ipv6_l3fwd_em_route_array[0]))

static uint8_t ipv4_l3fwd_out_if[L3FWD_HASH_ENTRIES] __rte_cache_aligned;
static uint8_t ipv6_l3fwd_out_if[L3FWD_HASH_ENTRIES] __rte_cache_aligned;

static rte_xmm_t mask0;
static rte_xmm_t mask1;
static rte_xmm_t mask2;

#if defined(RTE_MACHINE_CPUFLAG_SSE2)
static inline xmm_t
em_mask_key(void *key, xmm_t mask)
{
    __m128i data = _mm_loadu_si128((__m128i *)(key));

    return _mm_and_si128(data, mask);
}
#elif defined(RTE_MACHINE_CPUFLAG_NEON)
static inline xmm_t
em_mask_key(void *key, xmm_t mask)
{
    int32x4_t data = vld1q_s32((int32_t *)key);

    return vandq_s32(data, mask);
}
#elif defined(RTE_MACHINE_CPUFLAG_ALTIVEC)
static inline xmm_t
em_mask_key(void *key, xmm_t mask)
{
    xmm_t data = vec_ld(0, (xmm_t *)(key));

    return vec_and(data, mask);
}
#else
#error No vector engine (SSE, NEON, ALTIVEC) available, check your toolchain
#endif

static inline uint16_t
em_get_ipv4_dst_port(void *ipv4_hdr, uint16_t portid, void *lookup_struct)
{
    int ret = 0;
    union ipv4_5tuple_host key;
    struct rte_hash *ipv4_l3fwd_lookup_struct =
        (struct rte_hash *)lookup_struct;

    ipv4_hdr = (uint8_t *)ipv4_hdr +
        offsetof(struct rte_ipv4_hdr, time_to_live);

    /*
     * Get 5 tuple: dst port, src port, dst IP address,
     * src IP address and protocol.
     */
    key.xmm = em_mask_key(ipv4_hdr, mask0.x);

    /* Find destination port */
    ret = rte_hash_lookup(ipv4_l3fwd_lookup_struct, (const void *)&key);
    return (ret < 0) ? portid : ipv4_l3fwd_out_if[ret];
}

static inline uint16_t
em_get_ipv6_dst_port(void *ipv6_hdr, uint16_t portid, void *lookup_struct)
{
    int ret = 0;
    union ipv6_5tuple_host key;
    struct rte_hash *ipv6_l3fwd_lookup_struct =
        (struct rte_hash *)lookup_struct;

    ipv6_hdr = (uint8_t *)ipv6_hdr +
        offsetof(struct rte_ipv6_hdr, payload_len);
    void *data0 = ipv6_hdr;
    void *data1 = ((uint8_t *)ipv6_hdr) + sizeof(xmm_t);
    void *data2 = ((uint8_t *)ipv6_hdr) + sizeof(xmm_t) + sizeof(xmm_t);

    /* Get part of 5 tuple: src IP address lower 96 bits and protocol */
    key.xmm[0] = em_mask_key(data0, mask1.x);

    /*
     * Get part of 5 tuple: dst IP address lower 96 bits
     * and src IP address higher 32 bits.
     */
#if defined RTE_ARCH_X86
    key.xmm[1] = _mm_loadu_si128(data1);
#else
    key.xmm[1] = *(xmm_t *)data1;
#endif

    /*
     * Get part of 5 tuple: dst port and src port
     * and dst IP address higher 32 bits.
     */
    key.xmm[2] = em_mask_key(data2, mask2.x);

    /* Find destination port */
    ret = rte_hash_lookup(ipv6_l3fwd_lookup_struct, (const void *)&key);
    return (ret < 0) ? portid : ipv6_l3fwd_out_if[ret];
}

#if defined RTE_ARCH_X86 || defined RTE_MACHINE_CPUFLAG_NEON
#if defined(NO_HASH_MULTI_LOOKUP)
#include "l3fwd_em_sequential.h"
#else
#include "l3fwd_em_hlm.h"
#endif
#else
#include "l3fwd_em.h"
#endif

static void
convert_ipv4_5tuple(struct ipv4_5tuple *key1,
        union ipv4_5tuple_host *key2)
{
    key2->ip_dst = rte_cpu_to_be_32(key1->ip_dst);
    key2->ip_src = rte_cpu_to_be_32(key1->ip_src);
    key2->port_dst = rte_cpu_to_be_16(key1->port_dst);
    key2->port_src = rte_cpu_to_be_16(key1->port_src);
    key2->proto = key1->proto;
    key2->pad0 = 0;
    key2->pad1 = 0;
}

static void
convert_ipv6_5tuple(struct ipv6_5tuple *key1,
        union ipv6_5tuple_host *key2)
{
    uint32_t i;

    for (i = 0; i < 16; i++) {
        key2->ip_dst[i] = key1->ip_dst[i];
        key2->ip_src[i] = key1->ip_src[i];
    }
    key2->port_dst = rte_cpu_to_be_16(key1->port_dst);
    key2->port_src = rte_cpu_to_be_16(key1->port_src);
    key2->proto = key1->proto;
    key2->pad0 = 0;
    key2->pad1 = 0;
    key2->reserve = 0;
}

#define BYTE_VALUE_MAX 256
#define ALL_32_BITS 0xffffffff
#define BIT_8_TO_15 0x0000ff00

static inline void
populate_ipv4_few_flow_into_table(const struct rte_hash *h)
{
    uint32_t i;
    int32_t ret;

    mask0 = (rte_xmm_t){.u32 = {BIT_8_TO_15, ALL_32_BITS,
                ALL_32_BITS, ALL_32_BITS} };

    for (i = 0; i < IPV4_L3FWD_EM_NUM_ROUTES; i++) {
        struct ipv4_l3fwd_em_route  entry;
        union ipv4_5tuple_host newkey;

        entry = ipv4_l3fwd_em_route_array[i];
        convert_ipv4_5tuple(&entry.key, &newkey);
        ret = rte_hash_add_key(h, (void *) &newkey);
        if (ret < 0) {
            rte_exit(EXIT_FAILURE, "Unable to add entry %" PRIu32
                " to the l3fwd hash.\n", i);
        }
        ipv4_l3fwd_out_if[ret] = entry.if_out;
    }
    printf("Hash: Adding 0x%" PRIx64 " keys\n",
        (uint64_t)IPV4_L3FWD_EM_NUM_ROUTES);
}

#define BIT_16_TO_23 0x00ff0000
static inline void
populate_ipv6_few_flow_into_table(const struct rte_hash *h)
{
    uint32_t i;
    int32_t ret;

    mask1 = (rte_xmm_t){.u32 = {BIT_16_TO_23, ALL_32_BITS,
                ALL_32_BITS, ALL_32_BITS} };

    mask2 = (rte_xmm_t){.u32 = {ALL_32_BITS, ALL_32_BITS, 0, 0} };

    for (i = 0; i < IPV6_L3FWD_EM_NUM_ROUTES; i++) {
        struct ipv6_l3fwd_em_route entry;
        union ipv6_5tuple_host newkey;

        entry = ipv6_l3fwd_em_route_array[i];
        convert_ipv6_5tuple(&entry.key, &newkey);
        ret = rte_hash_add_key(h, (void *) &newkey);
        if (ret < 0) {
            rte_exit(EXIT_FAILURE, "Unable to add entry %" PRIu32
                " to the l3fwd hash.\n", i);
        }
        ipv6_l3fwd_out_if[ret] = entry.if_out;
    }
    printf("Hash: Adding 0x%" PRIx64 "keys\n",
        (uint64_t)IPV6_L3FWD_EM_NUM_ROUTES);
}

#define NUMBER_PORT_USED 4
static inline void
populate_ipv4_many_flow_into_table(const struct rte_hash *h,
        unsigned int nr_flow)
{
    unsigned i;

    mask0 = (rte_xmm_t){.u32 = {BIT_8_TO_15, ALL_32_BITS,
                ALL_32_BITS, ALL_32_BITS} };

    for (i = 0; i < nr_flow; i++) {
        struct ipv4_l3fwd_em_route entry;
        union ipv4_5tuple_host newkey;

        uint8_t a = (uint8_t)
            ((i/NUMBER_PORT_USED)%BYTE_VALUE_MAX);
        uint8_t b = (uint8_t)
            (((i/NUMBER_PORT_USED)/BYTE_VALUE_MAX)%BYTE_VALUE_MAX);
        uint8_t c = (uint8_t)
            ((i/NUMBER_PORT_USED)/(BYTE_VALUE_MAX*BYTE_VALUE_MAX));

        /* Create the ipv4 exact match flow */
        memset(&entry, 0, sizeof(entry));
        switch (i & (NUMBER_PORT_USED - 1)) {
        case 0:
            entry = ipv4_l3fwd_em_route_array[0];
            entry.key.ip_dst = RTE_IPV4(101, c, b, a);
            break;
        case 1:
            entry = ipv4_l3fwd_em_route_array[1];
            entry.key.ip_dst = RTE_IPV4(201, c, b, a);
            break;
        case 2:
            entry = ipv4_l3fwd_em_route_array[2];
            entry.key.ip_dst = RTE_IPV4(111, c, b, a);
            break;
        case 3:
            entry = ipv4_l3fwd_em_route_array[3];
            entry.key.ip_dst = RTE_IPV4(211, c, b, a);
            break;
        };
        convert_ipv4_5tuple(&entry.key, &newkey);
        int32_t ret = rte_hash_add_key(h, (void *) &newkey);

        if (ret < 0)
            rte_exit(EXIT_FAILURE, "Unable to add entry %u\n", i);

        ipv4_l3fwd_out_if[ret] = (uint8_t) entry.if_out;

    }
    printf("Hash: Adding 0x%x keys\n", nr_flow);
}

static inline void
populate_ipv6_many_flow_into_table(const struct rte_hash *h,
        unsigned int nr_flow)
{
    unsigned i;

    mask1 = (rte_xmm_t){.u32 = {BIT_16_TO_23, ALL_32_BITS,
                ALL_32_BITS, ALL_32_BITS} };
    mask2 = (rte_xmm_t){.u32 = {ALL_32_BITS, ALL_32_BITS, 0, 0} };

    for (i = 0; i < nr_flow; i++) {
        struct ipv6_l3fwd_em_route entry;
        union ipv6_5tuple_host newkey;

        uint8_t a = (uint8_t)
            ((i/NUMBER_PORT_USED)%BYTE_VALUE_MAX);
        uint8_t b = (uint8_t)
            (((i/NUMBER_PORT_USED)/BYTE_VALUE_MAX)%BYTE_VALUE_MAX);
        uint8_t c = (uint8_t)
            ((i/NUMBER_PORT_USED)/(BYTE_VALUE_MAX*BYTE_VALUE_MAX));

        /* Create the ipv6 exact match flow */
        memset(&entry, 0, sizeof(entry));
        switch (i & (NUMBER_PORT_USED - 1)) {
        case 0:
            entry = ipv6_l3fwd_em_route_array[0];
            break;
        case 1:
            entry = ipv6_l3fwd_em_route_array[1];
            break;
        case 2:
            entry = ipv6_l3fwd_em_route_array[2];
            break;
        case 3:
            entry = ipv6_l3fwd_em_route_array[3];
            break;
        };
        entry.key.ip_dst[13] = c;
        entry.key.ip_dst[14] = b;
        entry.key.ip_dst[15] = a;
        convert_ipv6_5tuple(&entry.key, &newkey);
        int32_t ret = rte_hash_add_key(h, (void *) &newkey);

        if (ret < 0)
            rte_exit(EXIT_FAILURE, "Unable to add entry %u\n", i);

        ipv6_l3fwd_out_if[ret] = (uint8_t) entry.if_out;

    }
    printf("Hash: Adding 0x%x keys\n", nr_flow);
}

/* Requirements:
 * 1. IP packets without extension;
 * 2. L4 payload should be either TCP or UDP.
 */
int
em_check_ptype(int portid)
{
    int i, ret;
    int ptype_l3_ipv4_ext = 0;
    int ptype_l3_ipv6_ext = 0;
    int ptype_l4_tcp = 0;
    int ptype_l4_udp = 0;
    uint32_t ptype_mask = RTE_PTYPE_L3_MASK | RTE_PTYPE_L4_MASK;

    ret = rte_eth_dev_get_supported_ptypes(portid, ptype_mask, NULL, 0);
    if (ret <= 0)
        return 0;

    uint32_t ptypes[ret];

    ret = rte_eth_dev_get_supported_ptypes(portid, ptype_mask, ptypes, ret);
    for (i = 0; i < ret; ++i) {
        switch (ptypes[i]) {
        case RTE_PTYPE_L3_IPV4_EXT:
            ptype_l3_ipv4_ext = 1;
            break;
        case RTE_PTYPE_L3_IPV6_EXT:
            ptype_l3_ipv6_ext = 1;
            break;
        case RTE_PTYPE_L4_TCP:
            ptype_l4_tcp = 1;
            break;
        case RTE_PTYPE_L4_UDP:
            ptype_l4_udp = 1;
            break;
        }
    }

    if (ptype_l3_ipv4_ext == 0)
        printf("port %d cannot parse RTE_PTYPE_L3_IPV4_EXT\n", portid);
    if (ptype_l3_ipv6_ext == 0)
        printf("port %d cannot parse RTE_PTYPE_L3_IPV6_EXT\n", portid);
    if (!ptype_l3_ipv4_ext || !ptype_l3_ipv6_ext)
        return 0;

    if (ptype_l4_tcp == 0)
        printf("port %d cannot parse RTE_PTYPE_L4_TCP\n", portid);
    if (ptype_l4_udp == 0)
        printf("port %d cannot parse RTE_PTYPE_L4_UDP\n", portid);
    if (ptype_l4_tcp && ptype_l4_udp)
        return 1;

    return 0;
}

static inline void
em_parse_ptype(struct rte_mbuf *m)
{
    struct rte_ether_hdr *eth_hdr;
    uint32_t packet_type = RTE_PTYPE_UNKNOWN;
    uint16_t ether_type;
    void *l3;
    int hdr_len;
    struct rte_ipv4_hdr *ipv4_hdr;
    struct rte_ipv6_hdr *ipv6_hdr;

    eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
    ether_type = eth_hdr->ether_type;
    l3 = (uint8_t *)eth_hdr + sizeof(struct rte_ether_hdr);
    if (ether_type == rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV4)) {
        ipv4_hdr = (struct rte_ipv4_hdr *)l3;
        hdr_len = (ipv4_hdr->version_ihl & RTE_IPV4_HDR_IHL_MASK) *
              RTE_IPV4_IHL_MULTIPLIER;
        if (hdr_len == sizeof(struct rte_ipv4_hdr)) {
            packet_type |= RTE_PTYPE_L3_IPV4;
            if (ipv4_hdr->next_proto_id == IPPROTO_TCP)
                packet_type |= RTE_PTYPE_L4_TCP;
            else if (ipv4_hdr->next_proto_id == IPPROTO_UDP)
                packet_type |= RTE_PTYPE_L4_UDP;
        } else
            packet_type |= RTE_PTYPE_L3_IPV4_EXT;
    } else if (ether_type == rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV6)) {
        ipv6_hdr = (struct rte_ipv6_hdr *)l3;
        if (ipv6_hdr->proto == IPPROTO_TCP)
            packet_type |= RTE_PTYPE_L3_IPV6 | RTE_PTYPE_L4_TCP;
        else if (ipv6_hdr->proto == IPPROTO_UDP)
            packet_type |= RTE_PTYPE_L3_IPV6 | RTE_PTYPE_L4_UDP;
        else
            packet_type |= RTE_PTYPE_L3_IPV6_EXT_UNKNOWN;
    }

    m->packet_type = packet_type;
}

uint16_t
em_cb_parse_ptype(uint16_t port __rte_unused, uint16_t queue __rte_unused,
          struct rte_mbuf *pkts[], uint16_t nb_pkts,
          uint16_t max_pkts __rte_unused,
          void *user_param __rte_unused)
{
    unsigned i;

    for (i = 0; i < nb_pkts; ++i)
        em_parse_ptype(pkts[i]);

    return nb_pkts;
}

/* main processing loop */
int
em_main_loop(__attribute__((unused)) void *dummy)
{
    struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
    unsigned lcore_id;
    uint64_t prev_tsc, diff_tsc, cur_tsc;
    int i, nb_rx;
    uint8_t queueid;
    uint16_t portid;
    struct lcore_conf *qconf;
    const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) /
        US_PER_S * BURST_TX_DRAIN_US;

    prev_tsc = 0;

    lcore_id = rte_lcore_id();
    qconf = &lcore_conf[lcore_id];

    if (qconf->n_rx_queue == 0) {
        RTE_LOG(INFO, L3FWD, "lcore %u has nothing to do\n", lcore_id);
        return 0;
    }

    RTE_LOG(INFO, L3FWD, "entering main loop on lcore %u\n", lcore_id);

    for (i = 0; i < qconf->n_rx_queue; i++) {

        portid = qconf->rx_queue_list[i].port_id;
        queueid = qconf->rx_queue_list[i].queue_id;
        RTE_LOG(INFO, L3FWD,
            " -- lcoreid=%u portid=%u rxqueueid=%hhu\n",
            lcore_id, portid, queueid);
    }

    while (!force_quit) {

        cur_tsc = rte_rdtsc();

        /*
         * TX burst queue drain
         */
        diff_tsc = cur_tsc - prev_tsc;
        if (unlikely(diff_tsc > drain_tsc)) {

            for (i = 0; i < qconf->n_tx_port; ++i) {
                portid = qconf->tx_port_id[i];
                if (qconf->tx_mbufs[portid].len == 0)
                    continue;
                send_burst(qconf,
                    qconf->tx_mbufs[portid].len,
                    portid);
                qconf->tx_mbufs[portid].len = 0;
            }

            prev_tsc = cur_tsc;
        }

        /*
         * Read packet from RX queues
         */
        for (i = 0; i < qconf->n_rx_queue; ++i) {
            portid = qconf->rx_queue_list[i].port_id;
            queueid = qconf->rx_queue_list[i].queue_id;
            nb_rx = rte_eth_rx_burst(portid, queueid, pkts_burst,
                MAX_PKT_BURST);
            if (nb_rx == 0)
                continue;

#if defined RTE_ARCH_X86 || defined RTE_MACHINE_CPUFLAG_NEON
            l3fwd_em_send_packets(nb_rx, pkts_burst,
                            portid, qconf);
#else
            l3fwd_em_no_opt_send_packets(nb_rx, pkts_burst,
                            portid, qconf);
#endif
        }
    }

    return 0;
}

/*
 * Initialize exact match (hash) parameters.
 */
void
setup_hash(const int socketid)
{
    struct rte_hash_parameters ipv4_l3fwd_hash_params = {
        .name = NULL,
        .entries = L3FWD_HASH_ENTRIES,
        .key_len = sizeof(union ipv4_5tuple_host),
        .hash_func = ipv4_hash_crc,
        .hash_func_init_val = 0,
    };

    struct rte_hash_parameters ipv6_l3fwd_hash_params = {
        .name = NULL,
        .entries = L3FWD_HASH_ENTRIES,
        .key_len = sizeof(union ipv6_5tuple_host),
        .hash_func = ipv6_hash_crc,
        .hash_func_init_val = 0,
    };

    char s[64];

    /* create ipv4 hash */
    snprintf(s, sizeof(s), "ipv4_l3fwd_hash_%d", socketid);
    ipv4_l3fwd_hash_params.name = s;
    ipv4_l3fwd_hash_params.socket_id = socketid;
    ipv4_l3fwd_em_lookup_struct[socketid] =
        rte_hash_create(&ipv4_l3fwd_hash_params);
    if (ipv4_l3fwd_em_lookup_struct[socketid] == NULL)
        rte_exit(EXIT_FAILURE,
            "Unable to create the l3fwd hash on socket %d\n",
            socketid);

    /* create ipv6 hash */
    snprintf(s, sizeof(s), "ipv6_l3fwd_hash_%d", socketid);
    ipv6_l3fwd_hash_params.name = s;
    ipv6_l3fwd_hash_params.socket_id = socketid;
    ipv6_l3fwd_em_lookup_struct[socketid] =
        rte_hash_create(&ipv6_l3fwd_hash_params);
    if (ipv6_l3fwd_em_lookup_struct[socketid] == NULL)
        rte_exit(EXIT_FAILURE,
            "Unable to create the l3fwd hash on socket %d\n",
            socketid);

    if (hash_entry_number != HASH_ENTRY_NUMBER_DEFAULT) {
        /* For testing hash matching with a large number of flows we
         * generate millions of IP 5-tuples with an incremented dst
         * address to initialize the hash table. */
        if (ipv6 == 0) {
            /* populate the ipv4 hash */
            populate_ipv4_many_flow_into_table(
                ipv4_l3fwd_em_lookup_struct[socketid],
                hash_entry_number);
        } else {
            /* populate the ipv6 hash */
            populate_ipv6_many_flow_into_table(
                ipv6_l3fwd_em_lookup_struct[socketid],
                hash_entry_number);
        }
    } else {
        /*
         * Use data in ipv4/ipv6 l3fwd lookup table
         * directly to initialize the hash table.
         */
        if (ipv6 == 0) {
            /* populate the ipv4 hash */
            populate_ipv4_few_flow_into_table(
                ipv4_l3fwd_em_lookup_struct[socketid]);
        } else {
            /* populate the ipv6 hash */
            populate_ipv6_few_flow_into_table(
                ipv6_l3fwd_em_lookup_struct[socketid]);
        }
    }
}

/* Return ipv4/ipv6 em fwd lookup struct. */
void *
em_get_ipv4_l3fwd_lookup_struct(const int socketid)
{
    return ipv4_l3fwd_em_lookup_struct[socketid];
}

void *
em_get_ipv6_l3fwd_lookup_struct(const int socketid)
{
    return ipv6_l3fwd_em_lookup_struct[socketid];
}