examples/server_node_efd/server/init.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016-2017 Intel Corporation
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>
#include <errno.h>
#include <stdarg.h>
#include <inttypes.h>

#include <rte_common.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_eal.h>
#include <rte_byteorder.h>
#include <rte_launch.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_branch_prediction.h>
#include <rte_debug.h>
#include <rte_ring.h>
#include <rte_log.h>
#include <rte_mempool.h>
#include <rte_memcpy.h>
#include <rte_mbuf.h>
#include <rte_interrupts.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_malloc.h>
#include <rte_string_fns.h>
#include <rte_cycles.h>
#include <rte_efd.h>
#include <rte_hash.h>

#include "common.h"
#include "args.h"
#include "init.h"

#define MBUFS_PER_NODE 1536
#define MBUFS_PER_PORT 1536
#define MBUF_CACHE_SIZE 512

#define RTE_MP_RX_DESC_DEFAULT 512
#define RTE_MP_TX_DESC_DEFAULT 512
#define NODE_QUEUE_RINGSIZE 128

#define NO_FLAGS 0

/* The mbuf pool for packet rx */
struct rte_mempool *pktmbuf_pool;

/* array of info/queues for nodes */
struct node *nodes;

/* EFD table */
struct rte_efd_table *efd_table;

/* Shared info between server and nodes */
struct shared_info *info;

static int
init_mbuf_pools(void)
{
    const unsigned int num_mbufs = (num_nodes * MBUFS_PER_NODE) +
            (info->num_ports * MBUFS_PER_PORT);

    /*
     * Don't pass single-producer/single-consumer flags to mbuf create as it
     * seems faster to use a cache instead
     */
    printf("Creating mbuf pool '%s' [%u mbufs] ...\n",
            PKTMBUF_POOL_NAME, num_mbufs);
    pktmbuf_pool = rte_pktmbuf_pool_create(PKTMBUF_POOL_NAME, num_mbufs,
        MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());

    return pktmbuf_pool == NULL; /* 0  on success */
}

static int
init_port(uint16_t port_num)
{
    /* for port configuration all features are off by default */
    struct rte_eth_conf port_conf = {
        .rxmode = {
            .mq_mode = RTE_ETH_MQ_RX_RSS,
        },
    };
    const uint16_t rx_rings = 1, tx_rings = num_nodes;
    uint16_t rx_ring_size = RTE_MP_RX_DESC_DEFAULT;
    uint16_t tx_ring_size = RTE_MP_TX_DESC_DEFAULT;
    struct rte_eth_dev_info dev_info;
    struct rte_eth_txconf txconf;

    uint16_t q;
    int retval;

    printf("Port %u init ... ", port_num);
    fflush(stdout);

    retval = rte_eth_dev_info_get(port_num, &dev_info);
    if (retval != 0)
        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;

    /*
     * Standard DPDK port initialisation - config port, then set up
     * rx and tx rings.
     */
    retval = rte_eth_dev_configure(port_num, rx_rings, tx_rings, &port_conf);
    if (retval != 0)
        return retval;

    retval = rte_eth_dev_adjust_nb_rx_tx_desc(port_num, &rx_ring_size,
            &tx_ring_size);
    if (retval != 0)
        return retval;

    for (q = 0; q < rx_rings; q++) {
        retval = rte_eth_rx_queue_setup(port_num, q, rx_ring_size,
                rte_eth_dev_socket_id(port_num),
                NULL, pktmbuf_pool);
        if (retval < 0)
            return retval;
    }

    txconf = dev_info.default_txconf;
    txconf.offloads = port_conf.txmode.offloads;
    for (q = 0; q < tx_rings; q++) {
        retval = rte_eth_tx_queue_setup(port_num, q, tx_ring_size,
                rte_eth_dev_socket_id(port_num),
                &txconf);
        if (retval < 0)
            return retval;
    }

    retval = rte_eth_promiscuous_enable(port_num);
    if (retval != 0)
        return retval;

    retval = rte_eth_dev_start(port_num);
    if (retval < 0)
        return retval;

    printf("done:\n");

    return 0;
}

static int
init_shm_rings(void)
{
    unsigned int i;
    unsigned int socket_id;
    const char *q_name;
    const unsigned int ringsize = NODE_QUEUE_RINGSIZE;

    nodes = rte_malloc("node details",
        sizeof(*nodes) * num_nodes, 0);
    if (nodes == NULL)
        rte_exit(EXIT_FAILURE, "Cannot allocate memory for "
                "node program details\n");

    for (i = 0; i < num_nodes; i++) {
        /* Create an RX queue for each node */
        socket_id = rte_socket_id();
        q_name = get_rx_queue_name(i);
        nodes[i].rx_q = rte_ring_create(q_name,
                ringsize, socket_id,
                RING_F_SP_ENQ | RING_F_SC_DEQ);
        if (nodes[i].rx_q == NULL)
            rte_exit(EXIT_FAILURE, "Cannot create rx ring queue "
                    "for node %u\n", i);
    }
    return 0;
}

/*
 * Create EFD table which will contain all the flows
 * that will be distributed among the nodes
 */

/* Create EFD table. 8< */
static void
create_efd_table(void)
{
    uint8_t socket_id = rte_socket_id();

    /* create table */
    efd_table = rte_efd_create("flow table", num_flows * 2, sizeof(uint32_t),
            1 << socket_id, socket_id);

    if (efd_table == NULL)
        rte_exit(EXIT_FAILURE, "Problem creating the flow table\n");
}

static void
populate_efd_table(void)
{
    unsigned int i;
    int32_t ret;
    uint32_t ip_dst;
    uint8_t socket_id = rte_socket_id();
    uint64_t node_id;

    /* Add flows in table */
    for (i = 0; i < num_flows; i++) {
        node_id = i % num_nodes;

        ip_dst = rte_cpu_to_be_32(i);
        ret = rte_efd_update(efd_table, socket_id,
                (void *)&ip_dst, (efd_value_t)node_id);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "Unable to add entry %u in "
                    "EFD table\n", i);
    }

    printf("EFD table: Adding 0x%x keys\n", num_flows);
}
/* >8 End of creation EFD table. */

/* Check the link status of all ports in up to 9s, and print them finally */
static void
check_all_ports_link_status(uint16_t port_num, uint32_t port_mask)
{
#define CHECK_INTERVAL 100 /* 100ms */
#define MAX_CHECK_TIME 90 /* 9s (90 * 100ms) in total */
    uint8_t count, all_ports_up, print_flag = 0;
    uint16_t portid;
    struct rte_eth_link link;
    int ret;
    char link_status_text[RTE_ETH_LINK_MAX_STR_LEN];

    printf("\nChecking link status");
    fflush(stdout);
    for (count = 0; count <= MAX_CHECK_TIME; count++) {
        all_ports_up = 1;
        for (portid = 0; portid < port_num; portid++) {
            if ((port_mask & (1 << info->id[portid])) == 0)
                continue;
            memset(&link, 0, sizeof(link));
            ret = rte_eth_link_get_nowait(info->id[portid], &link);
            if (ret < 0) {
                all_ports_up = 0;
                if (print_flag == 1)
                    printf("Port %u link get failed: %s\n",
                        portid, rte_strerror(-ret));
                continue;
            }
            /* print link status if flag set */
            if (print_flag == 1) {
                rte_eth_link_to_str(link_status_text,
                    sizeof(link_status_text), &link);
                printf("Port %d %s\n", info->id[portid],
                       link_status_text);
                continue;
            }
            /* clear all_ports_up flag if any link down */
            if (link.link_status == RTE_ETH_LINK_DOWN) {
                all_ports_up = 0;
                break;
            }
        }
        /* after finally printing all link status, get out */
        if (print_flag == 1)
            break;

        if (all_ports_up == 0) {
            printf(".");
            fflush(stdout);
            rte_delay_ms(CHECK_INTERVAL);
        }

        /* set the print_flag if all ports up or timeout */
        if (all_ports_up == 1 || count == (MAX_CHECK_TIME - 1)) {
            print_flag = 1;
            printf("done\n");
        }
    }
}

int
init(int argc, char *argv[])
{
    int retval;
    const struct rte_memzone *mz;
    uint8_t i, total_ports;

    /* init EAL, parsing EAL args */
    retval = rte_eal_init(argc, argv);
    if (retval < 0)
        return -1;
    argc -= retval;
    argv += retval;

    /* get total number of ports */
    total_ports = rte_eth_dev_count_avail();

    /* set up array for port data */
    mz = rte_memzone_reserve(MZ_SHARED_INFO, sizeof(*info),
                rte_socket_id(), NO_FLAGS);
    if (mz == NULL)
        rte_exit(EXIT_FAILURE, "Cannot reserve memory zone "
                "for port information\n");
    memset(mz->addr, 0, sizeof(*info));
    info = mz->addr;

    /* parse additional, application arguments */
    retval = parse_app_args(total_ports, argc, argv);
    if (retval != 0)
        return -1;

    /* initialise mbuf pools */
    retval = init_mbuf_pools();
    if (retval != 0)
        rte_exit(EXIT_FAILURE, "Cannot create needed mbuf pools\n");

    /* now initialise the ports we will use */
    for (i = 0; i < info->num_ports; i++) {
        retval = init_port(info->id[i]);
        if (retval != 0)
            rte_exit(EXIT_FAILURE, "Cannot initialise port %u\n",
                    (unsigned int) i);
    }

    check_all_ports_link_status(info->num_ports, (~0x0));

    /* initialise the node queues/rings for inter-eu comms */
    init_shm_rings();

    /* Create the EFD table */
    create_efd_table();

    /* Populate the EFD table */
    populate_efd_table();

    /* Share the total number of nodes */
    info->num_nodes = num_nodes;

    /* Share the total number of flows */
    info->num_flows = num_flows;
    return 0;
}