examples/dma/dmafwd.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2019-2021 Intel Corporation
 */
 
#include <stdint.h>
#include <stdlib.h>
#include <signal.h>
#include <stdbool.h>
#include <unistd.h>
 
#include <rte_argparse.h>
#include <rte_malloc.h>
#include <rte_ethdev.h>
#include <rte_dmadev.h>
 
/* size of ring used for software copying between rx and tx. */
#define RTE_LOGTYPE_DMA RTE_LOGTYPE_USER1
#define MAX_PKT_BURST 32
#define MEMPOOL_CACHE_SIZE 512
#define MIN_POOL_SIZE 65536U
#define CMD_LINE_OPT_PORTMASK_INDEX 1
#define CMD_LINE_OPT_COPY_TYPE_INDEX 2
 
/* configurable number of RX/TX ring descriptors */
#define RX_DEFAULT_RINGSIZE 1024
#define TX_DEFAULT_RINGSIZE 1024
 
/* max number of RX queues per port */
#define MAX_RX_QUEUES_COUNT 8
 
struct rxtx_port_config {
    /* common config */
    uint16_t rxtx_port;
    uint16_t nb_queues;
    /* for software copy mode */
    struct rte_ring *rx_to_tx_ring;
    /* for dmadev HW copy mode */
    uint16_t dmadev_ids[MAX_RX_QUEUES_COUNT];
};
 
/* Configuring ports and number of assigned lcores in struct. 8< */
struct rxtx_transmission_config {
    struct rxtx_port_config ports[RTE_MAX_ETHPORTS];
    uint16_t nb_ports;
    uint16_t nb_lcores;
};
/* >8 End of configuration of ports and number of assigned lcores. */
 
/* per-port statistics struct */
struct dma_port_statistics {
    uint64_t rx[RTE_MAX_ETHPORTS];
    uint64_t tx[RTE_MAX_ETHPORTS];
    uint64_t tx_dropped[RTE_MAX_ETHPORTS];
    uint64_t copy_dropped[RTE_MAX_ETHPORTS];
};
struct dma_port_statistics port_statistics;
struct total_statistics {
    uint64_t total_packets_dropped;
    uint64_t total_packets_tx;
    uint64_t total_packets_rx;
    uint64_t total_submitted;
    uint64_t total_completed;
    uint64_t total_failed;
};
 
typedef enum copy_mode_t {
#define COPY_MODE_SW "sw"
    COPY_MODE_SW_NUM,
#define COPY_MODE_DMA "hw"
    COPY_MODE_DMA_NUM,
    COPY_MODE_INVALID_NUM,
    COPY_MODE_SIZE_NUM = COPY_MODE_INVALID_NUM
} copy_mode_t;
 
/* mask of enabled ports */
static uint32_t dma_enabled_port_mask;
 
/* number of RX queues per port */
static uint16_t nb_queues = 1;
 
/* MAC updating enabled by default. */
static int mac_updating = 1;
 
/* hardware copy mode enabled by default. */
static copy_mode_t copy_mode = COPY_MODE_DMA_NUM;
 
/* size of descriptor ring for hardware copy mode or
 * rte_ring for software copy mode
 */
static uint16_t ring_size = 2048;
 
/* interval, in seconds, between stats prints */
static uint16_t stats_interval = 1;
/* global mbuf arrays for tracking DMA bufs */
#define MBUF_RING_SIZE  2048
#define MBUF_RING_MASK  (MBUF_RING_SIZE - 1)
struct dma_bufs {
    struct rte_mbuf *bufs[MBUF_RING_SIZE];
    struct rte_mbuf *copies[MBUF_RING_SIZE];
    uint16_t sent;
};
static struct dma_bufs dma_bufs[RTE_DMADEV_DEFAULT_MAX];
 
/* global transmission config */
struct rxtx_transmission_config cfg;
 
/* configurable number of RX/TX ring descriptors */
static uint16_t nb_rxd = RX_DEFAULT_RINGSIZE;
static uint16_t nb_txd = TX_DEFAULT_RINGSIZE;
 
static volatile bool force_quit;
 
static uint32_t dma_batch_sz = MAX_PKT_BURST;
static uint32_t max_frame_size;
static uint32_t force_min_copy_size;
 
/* ethernet addresses of ports */
static struct rte_ether_addr dma_ports_eth_addr[RTE_MAX_ETHPORTS];
 
struct rte_mempool *dma_pktmbuf_pool;
 
/* Print out statistics for one port. */
static void
print_port_stats(uint16_t port_id)
{
    printf("\nStatistics for port %u ------------------------------"
        "\nPackets sent: %34"PRIu64
        "\nPackets received: %30"PRIu64
        "\nPackets dropped on tx: %25"PRIu64
        "\nPackets dropped on copy: %23"PRIu64,
        port_id,
        port_statistics.tx[port_id],
        port_statistics.rx[port_id],
        port_statistics.tx_dropped[port_id],
        port_statistics.copy_dropped[port_id]);
}
 
/* Print out statistics for one dmadev device. */
static void
print_dmadev_stats(uint32_t dev_id, struct rte_dma_stats stats)
{
    printf("\nDMA channel %u", dev_id);
    printf("\n\t Total submitted ops: %"PRIu64"", stats.submitted);
    printf("\n\t Total completed ops: %"PRIu64"", stats.completed);
    printf("\n\t Total failed ops: %"PRIu64"", stats.errors);
}
 
static void
print_total_stats(struct total_statistics *ts)
{
    printf("\nAggregate statistics ==============================="
        "\nTotal packets Tx: %22"PRIu64" [pkt/s]"
        "\nTotal packets Rx: %22"PRIu64" [pkt/s]"
        "\nTotal packets dropped: %17"PRIu64" [pkt/s]",
        ts->total_packets_tx / stats_interval,
        ts->total_packets_rx / stats_interval,
        ts->total_packets_dropped / stats_interval);
 
    if (copy_mode == COPY_MODE_DMA_NUM) {
        printf("\nTotal submitted ops: %19"PRIu64" [ops/s]"
            "\nTotal completed ops: %19"PRIu64" [ops/s]"
            "\nTotal failed ops: %22"PRIu64" [ops/s]",
            ts->total_submitted / stats_interval,
            ts->total_completed / stats_interval,
            ts->total_failed / stats_interval);
    }
 
    printf("\n====================================================\n");
}
 
/* Print out statistics on packets dropped. */
static void
print_stats(char *prgname)
{
    struct total_statistics ts, delta_ts;
    struct rte_dma_stats stats = {0};
    uint32_t i, port_id, dev_id;
    char status_string[255]; /* to print at the top of the output */
    int status_strlen;
 
    const char clr[] = { 27, '[', '2', 'J', '\0' };
    const char topLeft[] = { 27, '[', '1', ';', '1', 'H', '\0' };
 
    status_strlen = snprintf(status_string, sizeof(status_string),
        "%s, ", prgname);
    status_strlen += snprintf(status_string + status_strlen,
        sizeof(status_string) - status_strlen,
        "Worker Threads = %d, ",
        rte_lcore_count() > 2 ? 2 : 1);
    status_strlen += snprintf(status_string + status_strlen,
        sizeof(status_string) - status_strlen,
        "Copy Mode = %s,\n", copy_mode == COPY_MODE_SW_NUM ?
        COPY_MODE_SW : COPY_MODE_DMA);
    status_strlen += snprintf(status_string + status_strlen,
        sizeof(status_string) - status_strlen,
        "Updating MAC = %s, ", mac_updating ?
        "enabled" : "disabled");
    status_strlen += snprintf(status_string + status_strlen,
        sizeof(status_string) - status_strlen,
        "Rx Queues = %d, ", nb_queues);
    status_strlen += snprintf(status_string + status_strlen,
        sizeof(status_string) - status_strlen,
        "Ring Size = %d\n", ring_size);
    status_strlen += snprintf(status_string + status_strlen,
        sizeof(status_string) - status_strlen,
        "Force Min Copy Size = %u Packet Data Room Size = %u",
        force_min_copy_size,
        rte_pktmbuf_data_room_size(dma_pktmbuf_pool) -
        RTE_PKTMBUF_HEADROOM);
 
    memset(&ts, 0, sizeof(struct total_statistics));
 
    while (!force_quit) {
        /* Sleep for "stats_interval" seconds each round - init sleep allows reading
         * messages from app startup.
         */
        sleep(stats_interval);
 
        /* Clear screen and move to top left */
        printf("%s%s", clr, topLeft);
 
        memset(&delta_ts, 0, sizeof(struct total_statistics));
 
        printf("%s\n", status_string);
 
        for (i = 0; i < cfg.nb_ports; i++) {
            port_id = cfg.ports[i].rxtx_port;
            print_port_stats(port_id);
 
            delta_ts.total_packets_dropped +=
                port_statistics.tx_dropped[port_id]
                + port_statistics.copy_dropped[port_id];
            delta_ts.total_packets_tx +=
                port_statistics.tx[port_id];
            delta_ts.total_packets_rx +=
                port_statistics.rx[port_id];
 
            if (copy_mode == COPY_MODE_DMA_NUM) {
                uint32_t j;
 
                for (j = 0; j < cfg.ports[i].nb_queues; j++) {
                    dev_id = cfg.ports[i].dmadev_ids[j];
                    rte_dma_stats_get(dev_id, 0, &stats);
                    print_dmadev_stats(dev_id, stats);
 
                    delta_ts.total_submitted += stats.submitted;
                    delta_ts.total_completed += stats.completed;
                    delta_ts.total_failed += stats.errors;
                }
            }
        }
 
        delta_ts.total_packets_tx -= ts.total_packets_tx;
        delta_ts.total_packets_rx -= ts.total_packets_rx;
        delta_ts.total_packets_dropped -= ts.total_packets_dropped;
        delta_ts.total_submitted -= ts.total_submitted;
        delta_ts.total_completed -= ts.total_completed;
        delta_ts.total_failed -= ts.total_failed;
 
        printf("\n");
        print_total_stats(&delta_ts);
 
        fflush(stdout);
 
        ts.total_packets_tx += delta_ts.total_packets_tx;
        ts.total_packets_rx += delta_ts.total_packets_rx;
        ts.total_packets_dropped += delta_ts.total_packets_dropped;
        ts.total_submitted += delta_ts.total_submitted;
        ts.total_completed += delta_ts.total_completed;
        ts.total_failed += delta_ts.total_failed;
    }
}
 
static void
update_mac_addrs(struct rte_mbuf *m, uint32_t dest_portid)
{
    struct rte_ether_hdr *eth;
    void *tmp;
 
    eth = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
 
    /* 02:00:00:00:00:xx - overwriting 2 bytes of source address but
     * it's acceptable cause it gets overwritten by rte_ether_addr_copy
     */
    tmp = &eth->dst_addr.addr_bytes[0];
    *((uint64_t *)tmp) = 0x000000000002 + ((uint64_t)dest_portid << 40);
 
    /* src addr */
    rte_ether_addr_copy(&dma_ports_eth_addr[dest_portid], &eth->src_addr);
}
 
/* Perform packet copy there is a user-defined function. 8< */
static inline void
pktmbuf_metadata_copy(const struct rte_mbuf *src, struct rte_mbuf *dst)
{
    dst->data_off = src->data_off;
    memcpy(&dst->rx_descriptor_fields1, &src->rx_descriptor_fields1,
        offsetof(struct rte_mbuf, buf_len) -
        offsetof(struct rte_mbuf, rx_descriptor_fields1));
}
 
/* Copy packet data */
static inline void
pktmbuf_sw_copy(struct rte_mbuf *src, struct rte_mbuf *dst)
{
    rte_memcpy(rte_pktmbuf_mtod(dst, char *),
        rte_pktmbuf_mtod(src, char *),
        RTE_MAX(src->data_len, force_min_copy_size));
}
/* >8 End of perform packet copy there is a user-defined function. */
 
static uint32_t
dma_enqueue_packets(struct rte_mbuf *pkts[], struct rte_mbuf *pkts_copy[],
    uint32_t nb_rx, uint16_t dev_id)
{
    struct dma_bufs *dma = &dma_bufs[dev_id];
    int ret;
    uint32_t i;
 
    for (i = 0; i < nb_rx; i++) {
        /* Perform data copy */
        ret = rte_dma_copy(dev_id, 0,
            rte_pktmbuf_iova(pkts[i]),
            rte_pktmbuf_iova(pkts_copy[i]),
            RTE_MAX(rte_pktmbuf_data_len(pkts[i]),
                force_min_copy_size),
            0);
 
        if (ret < 0)
            break;
 
        dma->bufs[ret & MBUF_RING_MASK] = pkts[i];
        dma->copies[ret & MBUF_RING_MASK] = pkts_copy[i];
    }
 
    ret = i;
    return ret;
}
 
static inline uint32_t
dma_enqueue(struct rte_mbuf *pkts[], struct rte_mbuf *pkts_copy[],
        uint32_t num, uint32_t step, uint16_t dev_id)
{
    uint32_t i, k, m, n;
 
    k = 0;
    for (i = 0; i < num; i += m) {
 
        m = RTE_MIN(step, num - i);
        n = dma_enqueue_packets(pkts + i, pkts_copy + i, m, dev_id);
        k += n;
        if (n > 0)
            rte_dma_submit(dev_id, 0);
 
        /* don't try to enqueue more if HW queue is full */
        if (n != m)
            break;
    }
 
    return k;
}
 
static inline uint32_t
dma_dequeue(struct rte_mbuf *src[], struct rte_mbuf *dst[], uint32_t num,
    uint16_t dev_id)
{
    struct dma_bufs *dma = &dma_bufs[dev_id];
    uint16_t nb_dq, filled;
    /* Dequeue the mbufs from DMA device. Since all memory
     * is DPDK pinned memory and therefore all addresses should
     * be valid, we don't check for copy errors
     */
    nb_dq = rte_dma_completed(dev_id, 0, num, NULL, NULL);
 
    /* Return early if no work to do */
    if (unlikely(nb_dq == 0))
        return nb_dq;
 
    /* Populate pkts_copy with the copies bufs from dma->copies for tx */
    for (filled = 0; filled < nb_dq; filled++) {
        src[filled] = dma->bufs[(dma->sent + filled) & MBUF_RING_MASK];
        dst[filled] = dma->copies[(dma->sent + filled) & MBUF_RING_MASK];
    }
    dma->sent += nb_dq;
 
    return filled;
 
}
 
/* Receive packets on one port and enqueue to dmadev or rte_ring. 8< */
static void
dma_rx_port(struct rxtx_port_config *rx_config)
{
    int32_t ret;
    uint32_t nb_rx, nb_enq, i, j;
    struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
    struct rte_mbuf *pkts_burst_copy[MAX_PKT_BURST];
 
    for (i = 0; i < rx_config->nb_queues; i++) {
 
        nb_rx = rte_eth_rx_burst(rx_config->rxtx_port, i,
            pkts_burst, MAX_PKT_BURST);
 
        if (nb_rx == 0) {
            if (copy_mode == COPY_MODE_DMA_NUM &&
                (nb_rx = dma_dequeue(pkts_burst, pkts_burst_copy,
                    MAX_PKT_BURST, rx_config->dmadev_ids[i])) > 0)
                goto handle_tx;
            continue;
        }
 
        port_statistics.rx[rx_config->rxtx_port] += nb_rx;
 
        ret = rte_mempool_get_bulk(dma_pktmbuf_pool,
            (void *)pkts_burst_copy, nb_rx);
 
        if (unlikely(ret < 0))
            rte_exit(EXIT_FAILURE,
                "Unable to allocate memory.\n");
 
        for (j = 0; j < nb_rx; j++)
            pktmbuf_metadata_copy(pkts_burst[j],
                pkts_burst_copy[j]);
 
        if (copy_mode == COPY_MODE_DMA_NUM) {
            /* enqueue packets for  hardware copy */
            nb_enq = dma_enqueue(pkts_burst, pkts_burst_copy,
                nb_rx, dma_batch_sz, rx_config->dmadev_ids[i]);
 
            /* free any not enqueued packets. */
            rte_mempool_put_bulk(dma_pktmbuf_pool,
                (void *)&pkts_burst[nb_enq],
                nb_rx - nb_enq);
            rte_mempool_put_bulk(dma_pktmbuf_pool,
                (void *)&pkts_burst_copy[nb_enq],
                nb_rx - nb_enq);
 
            port_statistics.copy_dropped[rx_config->rxtx_port] +=
                (nb_rx - nb_enq);
 
            /* get completed copies */
            nb_rx = dma_dequeue(pkts_burst, pkts_burst_copy,
                MAX_PKT_BURST, rx_config->dmadev_ids[i]);
        } else {
            /* Perform packet software copy, free source packets */
            for (j = 0; j < nb_rx; j++)
                pktmbuf_sw_copy(pkts_burst[j],
                    pkts_burst_copy[j]);
        }
 
handle_tx:
        rte_mempool_put_bulk(dma_pktmbuf_pool,
            (void *)pkts_burst, nb_rx);
 
        nb_enq = rte_ring_enqueue_burst(rx_config->rx_to_tx_ring,
            (void *)pkts_burst_copy, nb_rx, NULL);
 
        /* Free any not enqueued packets. */
        rte_mempool_put_bulk(dma_pktmbuf_pool,
            (void *)&pkts_burst_copy[nb_enq],
            nb_rx - nb_enq);
 
        port_statistics.copy_dropped[rx_config->rxtx_port] +=
            (nb_rx - nb_enq);
    }
}
/* >8 End of receive packets on one port and enqueue to dmadev or rte_ring. */
 
/* Transmit packets from dmadev/rte_ring for one port. 8< */
static void
dma_tx_port(struct rxtx_port_config *tx_config)
{
    uint32_t i, j, nb_dq, nb_tx;
    struct rte_mbuf *mbufs[MAX_PKT_BURST];
 
    for (i = 0; i < tx_config->nb_queues; i++) {
 
        /* Dequeue the mbufs from rx_to_tx_ring. */
        nb_dq = rte_ring_dequeue_burst(tx_config->rx_to_tx_ring,
                (void *)mbufs, MAX_PKT_BURST, NULL);
        if (nb_dq == 0)
            continue;
 
        /* Update macs if enabled */
        if (mac_updating) {
            for (j = 0; j < nb_dq; j++)
                update_mac_addrs(mbufs[j],
                    tx_config->rxtx_port);
        }
 
        nb_tx = rte_eth_tx_burst(tx_config->rxtx_port, 0,
                (void *)mbufs, nb_dq);
 
        port_statistics.tx[tx_config->rxtx_port] += nb_tx;
 
        if (unlikely(nb_tx < nb_dq)) {
            port_statistics.tx_dropped[tx_config->rxtx_port] +=
                (nb_dq - nb_tx);
            /* Free any unsent packets. */
            rte_mempool_put_bulk(dma_pktmbuf_pool,
            (void *)&mbufs[nb_tx], nb_dq - nb_tx);
        }
    }
}
/* >8 End of transmitting packets from dmadev. */
 
/* Main rx processing loop for dmadev. */
static void
rx_main_loop(void)
{
    uint16_t i;
    uint16_t nb_ports = cfg.nb_ports;
 
    RTE_LOG(INFO, DMA, "Entering main rx loop for copy on lcore %u\n",
        rte_lcore_id());
 
    while (!force_quit)
        for (i = 0; i < nb_ports; i++)
            dma_rx_port(&cfg.ports[i]);
}
 
/* Main tx processing loop for hardware copy. */
static void
tx_main_loop(void)
{
    uint16_t i;
    uint16_t nb_ports = cfg.nb_ports;
 
    RTE_LOG(INFO, DMA, "Entering main tx loop for copy on lcore %u\n",
        rte_lcore_id());
 
    while (!force_quit)
        for (i = 0; i < nb_ports; i++)
            dma_tx_port(&cfg.ports[i]);
}
 
/* Main rx and tx loop if only one worker lcore available */
static void
rxtx_main_loop(void)
{
    uint16_t i;
    uint16_t nb_ports = cfg.nb_ports;
 
    RTE_LOG(INFO, DMA, "Entering main rx and tx loop for copy on"
        " lcore %u\n", rte_lcore_id());
 
    while (!force_quit)
        for (i = 0; i < nb_ports; i++) {
            dma_rx_port(&cfg.ports[i]);
            dma_tx_port(&cfg.ports[i]);
        }
}
 
/* Start processing for each lcore. 8< */
static void start_forwarding_cores(void)
{
    uint32_t lcore_id = rte_lcore_id();
 
    RTE_LOG(INFO, DMA, "Entering %s on lcore %u\n",
        __func__, rte_lcore_id());
 
    if (cfg.nb_lcores == 1) {
        lcore_id = rte_get_next_lcore(lcore_id, true, true);
        rte_eal_remote_launch((lcore_function_t *)rxtx_main_loop,
            NULL, lcore_id);
    } else if (cfg.nb_lcores > 1) {
        lcore_id = rte_get_next_lcore(lcore_id, true, true);
        rte_eal_remote_launch((lcore_function_t *)rx_main_loop,
            NULL, lcore_id);
 
        lcore_id = rte_get_next_lcore(lcore_id, true, true);
        rte_eal_remote_launch((lcore_function_t *)tx_main_loop, NULL,
            lcore_id);
    }
}
/* >8 End of starting to process for each lcore. */
 
static int
dma_parse_portmask(const char *portmask)
{
    char *end = NULL;
    unsigned long pm;
 
    /* Parse hexadecimal string */
    pm = strtoul(portmask, &end, 16);
    if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
        return 0;
 
    return pm;
}
 
static copy_mode_t
dma_parse_copy_mode(const char *copy_mode)
{
    if (strcmp(copy_mode, COPY_MODE_SW) == 0)
        return COPY_MODE_SW_NUM;
    else if (strcmp(copy_mode, COPY_MODE_DMA) == 0)
        return COPY_MODE_DMA_NUM;
 
    return COPY_MODE_INVALID_NUM;
}
 
static int
dma_parse_args_cb(uint32_t index, const char *value, void *opaque)
{
    int port_mask;
 
    RTE_SET_USED(opaque);
 
    if (index == CMD_LINE_OPT_PORTMASK_INDEX) {
        port_mask = dma_parse_portmask(value);
        if (port_mask & ~dma_enabled_port_mask || port_mask <= 0) {
            printf("Invalid portmask, %s, suggest 0x%x\n",
                    value, dma_enabled_port_mask);
            return -1;
        }
        dma_enabled_port_mask = port_mask;
    } else if (index == CMD_LINE_OPT_COPY_TYPE_INDEX) {
        copy_mode = dma_parse_copy_mode(value);
        if (copy_mode == COPY_MODE_INVALID_NUM) {
            printf("Invalid copy type. Use: sw, hw\n");
            return -1;
        }
    } else {
        printf("Invalid index %u\n", index);
        return -1;
    }
 
    return 0;
}
 
/* Parse the argument given in the command line of the application */
static int
dma_parse_args(int argc, char **argv, unsigned int nb_ports)
{
    static struct rte_argparse obj = {
        .prog_name = "dma",
        .usage = "[EAL options] -- [optional parameters]",
        .descriptor = NULL,
        .epilog = NULL,
        .exit_on_error = false,
        .callback = dma_parse_args_cb,
        .opaque = NULL,
        .args = {
            { "--mac-updating", NULL, "Enable MAC addresses updating",
              &mac_updating, (void *)1,
              RTE_ARGPARSE_ARG_NO_VALUE | RTE_ARGPARSE_ARG_VALUE_INT,
            },
            { "--no-mac-updating", NULL, "Disable MAC addresses updating",
              &mac_updating, (void *)0,
              RTE_ARGPARSE_ARG_NO_VALUE | RTE_ARGPARSE_ARG_VALUE_INT,
            },
            { "--portmask", "-p", "hexadecimal bitmask of ports to configure",
              NULL, (void *)CMD_LINE_OPT_PORTMASK_INDEX,
              RTE_ARGPARSE_ARG_REQUIRED_VALUE,
            },
            { "--nb-queue", "-q", "number of RX queues per port (default is 1)",
              &nb_queues, NULL,
              RTE_ARGPARSE_ARG_REQUIRED_VALUE | RTE_ARGPARSE_ARG_VALUE_U16,
            },
            { "--copy-type", "-c", "type of copy: sw|hw",
              NULL, (void *)CMD_LINE_OPT_COPY_TYPE_INDEX,
              RTE_ARGPARSE_ARG_REQUIRED_VALUE,
            },
            { "--ring-size", "-s", "size of dmadev descriptor ring for hardware copy mode or rte_ring for software copy mode",
              &ring_size, NULL,
              RTE_ARGPARSE_ARG_REQUIRED_VALUE | RTE_ARGPARSE_ARG_VALUE_U16,
            },
            { "--dma-batch-size", "-b", "number of requests per DMA batch",
              &dma_batch_sz, NULL,
              RTE_ARGPARSE_ARG_REQUIRED_VALUE | RTE_ARGPARSE_ARG_VALUE_U32,
            },
            { "--max-frame-size", "-f", "max frame size",
              &max_frame_size, NULL,
              RTE_ARGPARSE_ARG_REQUIRED_VALUE | RTE_ARGPARSE_ARG_VALUE_U32,
            },
            { "--force-min-copy-size", "-m", "force a minimum copy length, even for smaller packets",
              &force_min_copy_size, NULL,
              RTE_ARGPARSE_ARG_REQUIRED_VALUE | RTE_ARGPARSE_ARG_VALUE_U32,
            },
            { "--stats-interval", "-i", "interval, in seconds, between stats prints (default is 1)",
              &stats_interval, NULL,
              RTE_ARGPARSE_ARG_REQUIRED_VALUE | RTE_ARGPARSE_ARG_VALUE_U16,
            },
            ARGPARSE_ARG_END(),
        },
    };
 
    const unsigned int default_port_mask = (1 << nb_ports) - 1;
    int ret;
 
    dma_enabled_port_mask = default_port_mask;
    ret = rte_argparse_parse(&obj, argc, argv);
    if (ret != 0)
        return ret;
 
    /* check argument's value which parsing by autosave. */
    if (dma_batch_sz == 0 || dma_batch_sz > MAX_PKT_BURST) {
        printf("Invalid dma batch size, %d.\n", dma_batch_sz);
        return -1;
    }
 
    if (max_frame_size > RTE_ETHER_MAX_JUMBO_FRAME_LEN) {
        printf("Invalid max frame size, %d.\n", max_frame_size);
        return -1;
    }
 
    if (nb_queues == 0 || nb_queues > MAX_RX_QUEUES_COUNT) {
        printf("Invalid RX queues number %d. Max %u\n",
            nb_queues, MAX_RX_QUEUES_COUNT);
        return -1;
    }
 
    if (ring_size == 0) {
        printf("Invalid ring size, %d.\n", ring_size);
        return -1;
    }
    if (ring_size > MBUF_RING_SIZE) {
        printf("Max ring_size is %d, setting ring_size to max",
                MBUF_RING_SIZE);
        ring_size = MBUF_RING_SIZE;
    }
 
    if (stats_interval == 0) {
        printf("Invalid stats interval, setting to 1\n");
        stats_interval = 1; /* set to default */
    }
 
    return 0;
}
 
/* check link status, return true if at least one port is up */
static int
check_link_status(uint32_t port_mask)
{
    uint16_t portid;
    struct rte_eth_link link;
    int ret, link_status = 0;
    char link_status_text[RTE_ETH_LINK_MAX_STR_LEN];
 
    printf("\nChecking link status\n");
    RTE_ETH_FOREACH_DEV(portid) {
        if ((port_mask & (1 << portid)) == 0)
            continue;
 
        memset(&link, 0, sizeof(link));
        ret = rte_eth_link_get(portid, &link);
        if (ret < 0) {
            printf("Port %u link get failed: err=%d\n",
                    portid, ret);
            continue;
        }
 
        /* Print link status */
        rte_eth_link_to_str(link_status_text,
            sizeof(link_status_text), &link);
        printf("Port %d %s\n", portid, link_status_text);
 
        if (link.link_status)
            link_status = 1;
    }
    return link_status;
}
 
/* Configuration of device. 8< */
static void
configure_dmadev_queue(uint32_t dev_id)
{
    struct rte_dma_info info;
    struct rte_dma_conf dev_config = { .nb_vchans = 1 };
    struct rte_dma_vchan_conf qconf = {
        .direction = RTE_DMA_DIR_MEM_TO_MEM,
        .nb_desc = ring_size
    };
    uint16_t vchan = 0;
 
    if (rte_dma_configure(dev_id, &dev_config) != 0)
        rte_exit(EXIT_FAILURE, "Error with rte_dma_configure()\n");
 
    if (rte_dma_vchan_setup(dev_id, vchan, &qconf) != 0) {
        printf("Error with queue configuration\n");
        rte_panic();
    }
    rte_dma_info_get(dev_id, &info);
    if (info.nb_vchans != 1) {
        printf("Error, no configured queues reported on device id %u\n", dev_id);
        rte_panic();
    }
    if (rte_dma_start(dev_id) != 0)
        rte_exit(EXIT_FAILURE, "Error with rte_dma_start()\n");
}
/* >8 End of configuration of device. */
 
/* Using dmadev API functions. 8< */
static void
assign_dmadevs(void)
{
    uint16_t nb_dmadev = 0;
    int16_t dev_id = rte_dma_next_dev(0);
    uint32_t i, j;
 
    for (i = 0; i < cfg.nb_ports; i++) {
        for (j = 0; j < cfg.ports[i].nb_queues; j++) {
            if (dev_id == -1)
                goto end;
 
            cfg.ports[i].dmadev_ids[j] = dev_id;
            configure_dmadev_queue(cfg.ports[i].dmadev_ids[j]);
            dev_id = rte_dma_next_dev(dev_id + 1);
            ++nb_dmadev;
        }
    }
end:
    if (nb_dmadev < cfg.nb_ports * cfg.ports[0].nb_queues)
        rte_exit(EXIT_FAILURE,
            "Not enough dmadevs (%u) for all queues (%u).\n",
            nb_dmadev, cfg.nb_ports * cfg.ports[0].nb_queues);
    RTE_LOG(INFO, DMA, "Number of used dmadevs: %u.\n", nb_dmadev);
}
/* >8 End of using dmadev API functions. */
 
/* Assign ring structures for packet exchanging. 8< */
static void
assign_rings(void)
{
    uint32_t i;
 
    for (i = 0; i < cfg.nb_ports; i++) {
        char ring_name[RTE_RING_NAMESIZE];
 
        snprintf(ring_name, sizeof(ring_name), "rx_to_tx_ring_%u", i);
        /* Create ring for inter core communication */
        cfg.ports[i].rx_to_tx_ring = rte_ring_create(
            ring_name, ring_size,
            rte_socket_id(), RING_F_SP_ENQ | RING_F_SC_DEQ);
 
        if (cfg.ports[i].rx_to_tx_ring == NULL)
            rte_exit(EXIT_FAILURE, "Ring create failed: %s\n",
                rte_strerror(rte_errno));
    }
}
/* >8 End of assigning ring structures for packet exchanging. */
 
static uint32_t
eth_dev_get_overhead_len(uint32_t max_rx_pktlen, uint16_t max_mtu)
{
    uint32_t overhead_len;
 
    if (max_mtu != UINT16_MAX && max_rx_pktlen > max_mtu)
        overhead_len = max_rx_pktlen - max_mtu;
    else
        overhead_len = RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
 
    return overhead_len;
}
 
static int
config_port_max_pkt_len(struct rte_eth_conf *conf,
        struct rte_eth_dev_info *dev_info)
{
    uint32_t overhead_len;
 
    if (max_frame_size == 0)
        return 0;
 
    if (max_frame_size < RTE_ETHER_MIN_LEN)
        return -1;
 
    overhead_len = eth_dev_get_overhead_len(dev_info->max_rx_pktlen,
            dev_info->max_mtu);
    conf->rxmode.mtu = max_frame_size - overhead_len;
 
    return 0;
}
 
/*
 * Initializes a given port using global settings and with the RX buffers
 * coming from the mbuf_pool passed as a parameter.
 */
static inline void
port_init(uint16_t portid, struct rte_mempool *mbuf_pool, uint16_t nb_queues)
{
    /* Configuring port to use RSS for multiple RX queues. 8< */
    static const struct rte_eth_conf port_conf = {
        .rxmode = {
            .mq_mode = RTE_ETH_MQ_RX_RSS,
        },
        .rx_adv_conf = {
            .rss_conf = {
                .rss_key = NULL,
                .rss_hf = RTE_ETH_RSS_PROTO_MASK,
            }
        }
    };
    /* >8 End of configuring port to use RSS for multiple RX queues. */
 
    struct rte_eth_rxconf rxq_conf;
    struct rte_eth_txconf txq_conf;
    struct rte_eth_conf local_port_conf = port_conf;
    struct rte_eth_dev_info dev_info;
    int ret, i;
 
    /* Skip ports that are not enabled */
    if ((dma_enabled_port_mask & (1 << portid)) == 0) {
        printf("Skipping disabled port %u\n", portid);
        return;
    }
 
    /* Init port */
    printf("Initializing port %u... ", portid);
    fflush(stdout);
    ret = rte_eth_dev_info_get(portid, &dev_info);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Cannot get device info: %s, port=%u\n",
            rte_strerror(-ret), portid);
 
    ret = config_port_max_pkt_len(&local_port_conf, &dev_info);
    if (ret != 0)
        rte_exit(EXIT_FAILURE,
            "Invalid max frame size: %u (port %u)\n",
            max_frame_size, portid);
 
    local_port_conf.rx_adv_conf.rss_conf.rss_hf &=
        dev_info.flow_type_rss_offloads;
    ret = rte_eth_dev_configure(portid, nb_queues, 1, &local_port_conf);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Cannot configure device:"
            " err=%d, port=%u\n", ret, portid);
 
    ret = rte_eth_dev_adjust_nb_rx_tx_desc(portid, &nb_rxd,
            &nb_txd);
    if (ret < 0)
        rte_exit(EXIT_FAILURE,
            "Cannot adjust number of descriptors: err=%d, port=%u\n",
            ret, portid);
 
    rte_eth_macaddr_get(portid, &dma_ports_eth_addr[portid]);
 
    /* Init RX queues */
    rxq_conf = dev_info.default_rxconf;
    rxq_conf.offloads = local_port_conf.rxmode.offloads;
    for (i = 0; i < nb_queues; i++) {
        ret = rte_eth_rx_queue_setup(portid, i, nb_rxd,
            rte_eth_dev_socket_id(portid), &rxq_conf,
            mbuf_pool);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
                "rte_eth_rx_queue_setup:err=%d,port=%u, queue_id=%u\n",
                ret, portid, i);
    }
 
    /* Init one TX queue on each port */
    txq_conf = dev_info.default_txconf;
    txq_conf.offloads = local_port_conf.txmode.offloads;
    ret = rte_eth_tx_queue_setup(portid, 0, nb_txd,
            rte_eth_dev_socket_id(portid),
            &txq_conf);
    if (ret < 0)
        rte_exit(EXIT_FAILURE,
            "rte_eth_tx_queue_setup:err=%d,port=%u\n",
            ret, portid);
 
    /* Start device. 8< */
    ret = rte_eth_dev_start(portid);
    if (ret < 0)
        rte_exit(EXIT_FAILURE,
            "rte_eth_dev_start:err=%d, port=%u\n",
            ret, portid);
    /* >8 End of starting device. */
 
    /* RX port is set in promiscuous mode. 8< */
    rte_eth_promiscuous_enable(portid);
    /* >8 End of RX port is set in promiscuous mode. */
 
    printf("Port %u, MAC address: " RTE_ETHER_ADDR_PRT_FMT "\n\n",
            portid,
            RTE_ETHER_ADDR_BYTES(&dma_ports_eth_addr[portid]));
 
    cfg.ports[cfg.nb_ports].rxtx_port = portid;
    cfg.ports[cfg.nb_ports++].nb_queues = nb_queues;
}
 
/* Get a device dump for each device being used by the application */
static void
dmadev_dump(void)
{
    uint32_t i, j;
 
    if (copy_mode != COPY_MODE_DMA_NUM)
        return;
 
    for (i = 0; i < cfg.nb_ports; i++)
        for (j = 0; j < cfg.ports[i].nb_queues; j++)
            rte_dma_dump(cfg.ports[i].dmadev_ids[j], stdout);
}
 
static void
signal_handler(int signum)
{
    if (signum == SIGINT || signum == SIGTERM) {
        printf("\n\nSignal %d received, preparing to exit...\n",
            signum);
        force_quit = true;
    } else if (signum == SIGUSR1) {
        dmadev_dump();
    }
}
 
int
main(int argc, char **argv)
{
    int ret;
    uint16_t nb_ports, portid;
    uint32_t i;
    unsigned int nb_mbufs;
    size_t sz;
 
    /* Init EAL. 8< */
    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
    /* >8 End of init EAL. */
    argc -= ret;
    argv += ret;
 
    force_quit = false;
    signal(SIGINT, signal_handler);
    signal(SIGTERM, signal_handler);
    signal(SIGUSR1, signal_handler);
 
    nb_ports = rte_eth_dev_count_avail();
    if (nb_ports == 0)
        rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
 
    /* Parse application arguments (after the EAL ones) */
    ret = dma_parse_args(argc, argv, nb_ports);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Invalid DMA arguments\n");
 
    /* Allocates mempool to hold the mbufs. 8< */
    nb_mbufs = RTE_MAX(nb_ports * (nb_queues * (nb_rxd + nb_txd +
        4 * MAX_PKT_BURST + ring_size) + ring_size +
        rte_lcore_count() * MEMPOOL_CACHE_SIZE),
        MIN_POOL_SIZE);
 
    /* Create the mbuf pool */
    sz = max_frame_size + RTE_PKTMBUF_HEADROOM;
    sz = RTE_MAX(sz, (size_t)RTE_MBUF_DEFAULT_BUF_SIZE);
    dma_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", nb_mbufs,
        MEMPOOL_CACHE_SIZE, 0, sz, rte_socket_id());
    if (dma_pktmbuf_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
    /* >8 End of allocates mempool to hold the mbufs. */
 
    if (force_min_copy_size >
        (uint32_t)(rte_pktmbuf_data_room_size(dma_pktmbuf_pool) -
               RTE_PKTMBUF_HEADROOM))
        rte_exit(EXIT_FAILURE,
             "Force min copy size > packet mbuf size\n");
 
    /* Initialize each port. 8< */
    cfg.nb_ports = 0;
    RTE_ETH_FOREACH_DEV(portid)
        port_init(portid, dma_pktmbuf_pool, nb_queues);
    /* >8 End of initializing each port. */
 
    /* Initialize port xstats */
    memset(&port_statistics, 0, sizeof(port_statistics));
 
    /* Assigning each port resources. 8< */
    while (!check_link_status(dma_enabled_port_mask) && !force_quit)
        sleep(1);
 
    /* Check if there is enough lcores for all ports. */
    cfg.nb_lcores = rte_lcore_count() - 1;
    if (cfg.nb_lcores < 1)
        rte_exit(EXIT_FAILURE,
            "There should be at least one worker lcore.\n");
 
    if (copy_mode == COPY_MODE_DMA_NUM)
        assign_dmadevs();
 
    assign_rings();
    /* >8 End of assigning each port resources. */
 
    start_forwarding_cores();
    /* main core prints stats while other cores forward */
    print_stats(argv[0]);
 
    /* force_quit is true when we get here */
    rte_eal_mp_wait_lcore();
 
    uint32_t j;
    for (i = 0; i < cfg.nb_ports; i++) {
        printf("Closing port %d\n", cfg.ports[i].rxtx_port);
        ret = rte_eth_dev_stop(cfg.ports[i].rxtx_port);
        if (ret != 0)
            RTE_LOG(ERR, DMA, "rte_eth_dev_stop: err=%s, port=%u\n",
                rte_strerror(-ret), cfg.ports[i].rxtx_port);
 
        rte_eth_dev_close(cfg.ports[i].rxtx_port);
        if (copy_mode == COPY_MODE_DMA_NUM) {
            for (j = 0; j < cfg.ports[i].nb_queues; j++) {
                printf("Stopping dmadev %d\n",
                    cfg.ports[i].dmadev_ids[j]);
                rte_dma_stop(cfg.ports[i].dmadev_ids[j]);
            }
        } else /* copy_mode == COPY_MODE_SW_NUM */
            rte_ring_free(cfg.ports[i].rx_to_tx_ring);
    }
 
    /* clean up the EAL */
    rte_eal_cleanup();
 
    printf("Bye...\n");
    return 0;
}