examples/qos_sched/app_thread.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#include <stdint.h>

#include <rte_log.h>
#include <rte_mbuf.h>
#include <rte_malloc.h>
#include <rte_cycles.h>
#include <rte_ethdev.h>
#include <rte_memcpy.h>
#include <rte_byteorder.h>
#include <rte_branch_prediction.h>
#include <rte_sched.h>

#include "main.h"

/*
 * QoS parameters are encoded as follows:
 *      Outer VLAN ID defines subport
 *      Inner VLAN ID defines pipe
 *      Destination IP host (0.0.0.XXX) defines queue
 * Values below define offset to each field from start of frame
 */
#define SUBPORT_OFFSET  7
#define PIPE_OFFSET     9
#define QUEUE_OFFSET    20
#define COLOR_OFFSET    19

static inline int
get_pkt_sched(struct rte_mbuf *m, uint32_t *subport, uint32_t *pipe,
            uint32_t *traffic_class, uint32_t *queue, uint32_t *color)
{
    uint16_t *pdata = rte_pktmbuf_mtod(m, uint16_t *);
    uint16_t pipe_queue;

    /* Outer VLAN ID*/
    *subport = (rte_be_to_cpu_16(pdata[SUBPORT_OFFSET]) & 0x0FFF) &
        (port_params.n_subports_per_port - 1);

    /* Inner VLAN ID */
    *pipe = (rte_be_to_cpu_16(pdata[PIPE_OFFSET]) & 0x0FFF) &
        (subport_params[*subport].n_pipes_per_subport_enabled - 1);

    pipe_queue = active_queues[(pdata[QUEUE_OFFSET] >> 8) % n_active_queues];

    /* Traffic class (Destination IP) */
    *traffic_class = pipe_queue > RTE_SCHED_TRAFFIC_CLASS_BE ?
            RTE_SCHED_TRAFFIC_CLASS_BE : pipe_queue;

    /* Traffic class queue (Destination IP) */
    *queue = pipe_queue - *traffic_class;

    /* Color (Destination IP) */
    *color = pdata[COLOR_OFFSET] & 0x03;

    return 0;
}

void
app_rx_thread(struct thread_conf **confs)
{
    uint32_t i, nb_rx;
    struct rte_mbuf *rx_mbufs[burst_conf.rx_burst] __rte_cache_aligned;
    struct thread_conf *conf;
    int conf_idx = 0;

    uint32_t subport;
    uint32_t pipe;
    uint32_t traffic_class;
    uint32_t queue;
    uint32_t color;

    while ((conf = confs[conf_idx])) {
        nb_rx = rte_eth_rx_burst(conf->rx_port, conf->rx_queue, rx_mbufs,
                burst_conf.rx_burst);

        if (likely(nb_rx != 0)) {
            APP_STATS_ADD(conf->stat.nb_rx, nb_rx);

            for(i = 0; i < nb_rx; i++) {
                get_pkt_sched(rx_mbufs[i],
                        &subport, &pipe, &traffic_class, &queue, &color);
                rte_sched_port_pkt_write(conf->sched_port,
                        rx_mbufs[i],
                        subport, pipe,
                        traffic_class, queue,
                        (enum rte_color) color);
            }

            if (unlikely(rte_ring_sp_enqueue_bulk(conf->rx_ring,
                    (void **)rx_mbufs, nb_rx, NULL) == 0)) {
                for(i = 0; i < nb_rx; i++) {
                    rte_pktmbuf_free(rx_mbufs[i]);

                    APP_STATS_ADD(conf->stat.nb_drop, 1);
                }
            }
        }
        conf_idx++;
        if (confs[conf_idx] == NULL)
            conf_idx = 0;
    }
}



/* Send the packet to an output interface
 * For performance reason function returns number of packets dropped, not sent,
 * so 0 means that all packets were sent successfully
 */

static inline void
app_send_burst(struct thread_conf *qconf)
{
    struct rte_mbuf **mbufs;
    uint32_t n, ret;

    mbufs = (struct rte_mbuf **)qconf->m_table;
    n = qconf->n_mbufs;

    do {
        ret = rte_eth_tx_burst(qconf->tx_port, qconf->tx_queue, mbufs, (uint16_t)n);
        /* we cannot drop the packets, so re-send */
        /* update number of packets to be sent */
        n -= ret;
        mbufs = (struct rte_mbuf **)&mbufs[ret];
    } while (n);
}


/* Send the packet to an output interface */
static void
app_send_packets(struct thread_conf *qconf, struct rte_mbuf **mbufs, uint32_t nb_pkt)
{
    uint32_t i, len;

    len = qconf->n_mbufs;
    for(i = 0; i < nb_pkt; i++) {
        qconf->m_table[len] = mbufs[i];
        len++;
        /* enough pkts to be sent */
        if (unlikely(len == burst_conf.tx_burst)) {
            qconf->n_mbufs = len;
            app_send_burst(qconf);
            len = 0;
        }
    }

    qconf->n_mbufs = len;
}

void
app_tx_thread(struct thread_conf **confs)
{
    struct rte_mbuf *mbufs[burst_conf.qos_dequeue];
    struct thread_conf *conf;
    int conf_idx = 0;
    int retval;
    const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S * BURST_TX_DRAIN_US;

    while ((conf = confs[conf_idx])) {
        retval = rte_ring_sc_dequeue_bulk(conf->tx_ring, (void **)mbufs,
                    burst_conf.qos_dequeue, NULL);
        if (likely(retval != 0)) {
            app_send_packets(conf, mbufs, burst_conf.qos_dequeue);

            conf->counter = 0; /* reset empty read loop counter */
        }

        conf->counter++;

        /* drain ring and TX queues */
        if (unlikely(conf->counter > drain_tsc)) {
            /* now check is there any packets left to be transmitted */
            if (conf->n_mbufs != 0) {
                app_send_burst(conf);

                conf->n_mbufs = 0;
            }
            conf->counter = 0;
        }

        conf_idx++;
        if (confs[conf_idx] == NULL)
            conf_idx = 0;
    }
}


void
app_worker_thread(struct thread_conf **confs)
{
    struct rte_mbuf *mbufs[burst_conf.ring_burst];
    struct thread_conf *conf;
    int conf_idx = 0;

    while ((conf = confs[conf_idx])) {
        uint32_t nb_pkt;

        /* Read packet from the ring */
        nb_pkt = rte_ring_sc_dequeue_burst(conf->rx_ring, (void **)mbufs,
                    burst_conf.ring_burst, NULL);
        if (likely(nb_pkt)) {
            int nb_sent = rte_sched_port_enqueue(conf->sched_port, mbufs,
                    nb_pkt);

            APP_STATS_ADD(conf->stat.nb_drop, nb_pkt - nb_sent);
            APP_STATS_ADD(conf->stat.nb_rx, nb_pkt);
        }

        nb_pkt = rte_sched_port_dequeue(conf->sched_port, mbufs,
                    burst_conf.qos_dequeue);
        if (likely(nb_pkt > 0))
            while (rte_ring_sp_enqueue_bulk(conf->tx_ring,
                    (void **)mbufs, nb_pkt, NULL) == 0)
                ; /* empty body */

        conf_idx++;
        if (confs[conf_idx] == NULL)
            conf_idx = 0;
    }
}


void
app_mixed_thread(struct thread_conf **confs)
{
    struct rte_mbuf *mbufs[burst_conf.ring_burst];
    struct thread_conf *conf;
    int conf_idx = 0;
    const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S * BURST_TX_DRAIN_US;

    while ((conf = confs[conf_idx])) {
        uint32_t nb_pkt;

        /* Read packet from the ring */
        nb_pkt = rte_ring_sc_dequeue_burst(conf->rx_ring, (void **)mbufs,
                    burst_conf.ring_burst, NULL);
        if (likely(nb_pkt)) {
            int nb_sent = rte_sched_port_enqueue(conf->sched_port, mbufs,
                    nb_pkt);

            APP_STATS_ADD(conf->stat.nb_drop, nb_pkt - nb_sent);
            APP_STATS_ADD(conf->stat.nb_rx, nb_pkt);
        }


        nb_pkt = rte_sched_port_dequeue(conf->sched_port, mbufs,
                    burst_conf.qos_dequeue);
        if (likely(nb_pkt > 0)) {
            app_send_packets(conf, mbufs, nb_pkt);

            conf->counter = 0; /* reset empty read loop counter */
        }

        conf->counter++;

        /* drain ring and TX queues */
        if (unlikely(conf->counter > drain_tsc)) {

            /* now check is there any packets left to be transmitted */
            if (conf->n_mbufs != 0) {
                app_send_burst(conf);

                conf->n_mbufs = 0;
            }
            conf->counter = 0;
        }

        conf_idx++;
        if (confs[conf_idx] == NULL)
            conf_idx = 0;
    }
}