Re: [dpdk-dev] [PATCH] examples/ioat: create sample app on ioat driver usage

[Aaron Conole <aconole@redhat.com>]

Marcin Baran <marcinx.baran@intel.com> writes:

> From: Pawel Modrak <pawelx.modrak@intel.com>
>
> A new sample app demonstrating use of driver for CBDMA.
> The app receives packets, performs software or hardware
> copy, changes packets' MAC addresses (if enabled) and
> forwards them. The patch includes sample application
> as well as it's guide.
>
> Signed-off-by: Pawel Modrak <pawelx.modrak@intel.com>
> Signed-off-by: Marcin Baran <marcinx.baran@intel.com>
> ---
>  doc/guides/sample_app_ug/index.rst |    1 +
>  doc/guides/sample_app_ug/intro.rst |    4 +
>  doc/guides/sample_app_ug/ioat.rst  |  691 +++++++++++++++++++
>  examples/Makefile                  |    3 +
>  examples/ioat/Makefile             |   54 ++
>  examples/ioat/ioatfwd.c            | 1010 ++++++++++++++++++++++++++++
>  examples/ioat/meson.build          |   13 +
>  examples/meson.build               |    1 +
>  8 files changed, 1777 insertions(+)
>  create mode 100644 doc/guides/sample_app_ug/ioat.rst
>  create mode 100644 examples/ioat/Makefile
>  create mode 100644 examples/ioat/ioatfwd.c
>  create mode 100644 examples/ioat/meson.build
>
> diff --git a/doc/guides/sample_app_ug/index.rst b/doc/guides/sample_app_ug/index.rst
> index f23f8f59e..a6a1d9e7a 100644
> --- a/doc/guides/sample_app_ug/index.rst
> +++ b/doc/guides/sample_app_ug/index.rst
> @@ -23,6 +23,7 @@ Sample Applications User Guides
>      ip_reassembly
>      kernel_nic_interface
>      keep_alive
> +    ioat
>      l2_forward_crypto
>      l2_forward_job_stats
>      l2_forward_real_virtual
> diff --git a/doc/guides/sample_app_ug/intro.rst b/doc/guides/sample_app_ug/intro.rst
> index 90704194a..74462312f 100644
> --- a/doc/guides/sample_app_ug/intro.rst
> +++ b/doc/guides/sample_app_ug/intro.rst
> @@ -91,6 +91,10 @@ examples are highlighted below.
>    forwarding, or ``l3fwd`` application does forwarding based on Internet
>    Protocol, IPv4 or IPv6 like a simple router.
>  
> +* :doc:`Hardware packet copying<ioat>`: The Hardware packet copying,
> +  or ``ioatfwd`` application demonstrates how to use IOAT rawdev driver for
> +  copying packets between two threads.
> +
>  * :doc:`Packet Distributor<dist_app>`: The Packet Distributor
>    demonstrates how to distribute packets arriving on an Rx port to different
>    cores for processing and transmission.
> diff --git a/doc/guides/sample_app_ug/ioat.rst b/doc/guides/sample_app_ug/ioat.rst
> new file mode 100644
> index 000000000..378d70b81
> --- /dev/null
> +++ b/doc/guides/sample_app_ug/ioat.rst
> @@ -0,0 +1,691 @@
> +..  SPDX-License-Identifier: BSD-3-Clause
> +    Copyright(c) 2019 Intel Corporation.
> +
> +Sample Application of packet copying using Intel\|reg| QuickData Technology
> +============================================================================
> +
> +Overview
> +--------
> +
> +This sample is intended as a demonstration of the basic components of a DPDK
> +forwarding application and example of how to use IOAT driver API to make
> +packets copies.
> +
> +Also while forwarding, the MAC addresses are affected as follows:
> +
> +*   The source MAC address is replaced by the TX port MAC address
> +
> +*   The destination MAC address is replaced by  02:00:00:00:00:TX_PORT_ID
> +
> +This application can be used to compare performance of using software packet
> +copy with copy done using a DMA device for different sizes of packets.
> +The example will print out statistics each second. The stats shows
> +received/send packets and packets dropped or failed to copy.
> +
> +Compiling the Application
> +-------------------------
> +
> +To compile the sample application see :doc:`compiling`.
> +
> +The application is located in the ``ioat`` sub-directory.
> +
> +
> +Running the Application
> +-----------------------
> +
> +In order to run the hardware copy application, the copying device
> +needs to be bound to user-space IO driver.
> +
> +Refer to the *IOAT Rawdev Driver for Intel\ |reg| QuickData Technology*
> +guide for information on using the driver.
> +
> +The application requires a number of command line options:
> +
> +.. code-block:: console
> +
> +    ./build/ioatfwd [EAL options] -- -p MASK [-C CT] [--[no-]mac-updating]
> +
> +where,
> +
> +*   p MASK: A hexadecimal bitmask of the ports to configure
> +
> +*   c CT: Performed packet copy type: software (sw) or hardware using
> +    DMA (rawdev)
> +
> +*   s RS: size of IOAT rawdev ring for hardware copy mode or rte_ring for
> +    software copy mode
> +
> +*   --[no-]mac-updating: Whether MAC address of packets should be changed
> +    or not
> +
> +The application can be launched in 2 different configurations:
> +
> +*   Performing software packet copying
> +
> +*   Performing hardware packet copying
> +
> +Each port needs 2 lcores: one of them receives incoming traffic and makes
> +a copy of each packet. The second lcore then updates MAC address and sends
> +the copy. For each configuration an additional lcore is needed since
> +master lcore in use which is responsible for configuration, statistics
> +printing and safe deinitialization of all ports and devices.
> +
> +The application can use a maximum of 8 ports.
> +
> +To run the application in a Linux environment with 3 lcores (one of them
> +is master lcore), 1 port (port 0), software copying and MAC updating issue
> +the command:
> +
> +.. code-block:: console
> +
> +    $ ./build/ioatfwd -l 0-2 -n 2 -- -p 0x1 --mac-updating -c sw
> +
> +To run the application in a Linux environment with 5 lcores (one of them
> +is master lcore), 2 ports (ports 0 and 1), hardware copying and no MAC
> +updating issue the command:
> +
> +.. code-block:: console
> +
> +    $ ./build/ioatfwd -l 0-4 -n 1 -- -p 0x3 --no-mac-updating -c rawdev
> +
> +Refer to the *DPDK Getting Started Guide* for general information on
> +running applications and the Environment Abstraction Layer (EAL) options.
> +
> +Explanation
> +-----------
> +
> +The following sections provide an explanation of the main components of the
> +code.
> +
> +All DPDK library functions used in the sample code are prefixed with
> +``rte_`` and are explained in detail in the *DPDK API Documentation*.
> +
> +
> +The Main Function
> +~~~~~~~~~~~~~~~~~
> +
> +The ``main()`` function performs the initialization and calls the execution
> +threads for each lcore.
> +
> +The first task is to initialize the Environment Abstraction Layer (EAL).
> +The ``argc`` and ``argv`` arguments are provided to the ``rte_eal_init()``
> +function. The value returned is the number of parsed arguments:
> +
> +.. code-block:: c
> +
> +    /* init EAL */
> +    ret = rte_eal_init(argc, argv);
> +    if (ret < 0)
> +        rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
> +
> +
> +The ``main()`` also allocates a mempool to hold the mbufs (Message Buffers)
> +used by the application:
> +
> +.. code-block:: c
> +
> +    nb_mbufs = RTE_MAX(rte_eth_dev_count_avail() * (nb_rxd + nb_txd
> +        + MAX_PKT_BURST + rte_lcore_count() * MEMPOOL_CACHE_SIZE),
> +        MIN_POOL_SIZE);
> +
> +    /* Create the mbuf pool */
> +    ioat_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", nb_mbufs,
> +        MEMPOOL_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
> +        rte_socket_id());
> +    if (ioat_pktmbuf_pool == NULL)
> +        rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
> +
> +Mbufs are the packet buffer structure used by DPDK. They are explained in
> +detail in the "Mbuf Library" section of the *DPDK Programmer's Guide*.
> +
> +The ``main()`` function also initializes the ports:
> +
> +.. code-block:: c
> +
> +    /* Initialise each port */
> +    RTE_ETH_FOREACH_DEV(portid) {
> +        port_init(portid, ioat_pktmbuf_pool);
> +    }
> +
> +Each port is configured using ``port_init()``:
> +
> +.. code-block:: c
> +
> +    static inline void
> +    port_init(uint16_t portid, struct rte_mempool *mbuf_pool)
> +    {
> +        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;
> +
> +        /* Skip ports that are not enabled */
> +        if ((ioat_enabled_port_mask & (1 << portid)) == 0) {
> +            printf("Skipping disabled port %u\n", portid);
> +            return;
> +        }
> +
> +        /* Init port */
> +        printf("Initializing port %u... ", portid);
> +        fflush(stdout);
> +        rte_eth_dev_info_get(portid, &dev_info);
> +        if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
> +            local_port_conf.txmode.offloads |=
> +                DEV_TX_OFFLOAD_MBUF_FAST_FREE;
> +        ret = rte_eth_dev_configure(portid, 1, 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, &ioat_ports_eth_addr[portid]);
> +
> +        /* Init one RX queue */
> +        fflush(stdout);
> +        rxq_conf = dev_info.default_rxconf;
> +        rxq_conf.offloads = local_port_conf.rxmode.offloads;
> +        ret = rte_eth_rx_queue_setup(portid, 0, 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\n",
> +                    ret, portid);
> +
> +        /* Init one TX queue on each port */
> +        fflush(stdout);
> +        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);
> +
> +        /* Initialize TX buffers */
> +        tx_buffer[portid] = rte_zmalloc_socket("tx_buffer",
> +                RTE_ETH_TX_BUFFER_SIZE(MAX_PKT_BURST), 0,
> +                rte_eth_dev_socket_id(portid));
> +        if (tx_buffer[portid] == NULL)
> +            rte_exit(EXIT_FAILURE, "Cannot allocate buffer for tx "
> +                    "on port %u\n", portid);
> +
> +        rte_eth_tx_buffer_init(tx_buffer[portid], MAX_PKT_BURST);
> +
> +        ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[portid],
> +                rte_eth_tx_buffer_count_callback,
> +                &port_statistics[portid].tx_dropped);
> +        if (ret < 0)
> +            rte_exit(EXIT_FAILURE,
> +            "Cannot set error callback for tx buffer on port %u\n",
> +                    portid);
> +
> +        /* Start device */
> +        ret = rte_eth_dev_start(portid);
> +        if (ret < 0)
> +            rte_exit(EXIT_FAILURE, "rte_eth_dev_start:err=%d, port=%u\n",
> +                    ret, portid);
> +
> +        rte_eth_promiscuous_enable(portid);
> +
> +        printf("Port %u, MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n\n",
> +                portid,
> +                ioat_ports_eth_addr[portid].addr_bytes[0],
> +                ioat_ports_eth_addr[portid].addr_bytes[1],
> +                ioat_ports_eth_addr[portid].addr_bytes[2],
> +                ioat_ports_eth_addr[portid].addr_bytes[3],
> +                ioat_ports_eth_addr[portid].addr_bytes[4],
> +                ioat_ports_eth_addr[portid].addr_bytes[5]);
> +    }
> +
> +The Ethernet ports are configured with local settings using the
> +``rte_eth_dev_configure()`` function and the ``port_conf`` struct:
> +
> +.. code-block:: c
> +
> +    static struct rte_eth_conf port_conf = {
> +        .rxmode = {
> +            .max_rx_pkt_len = RTE_ETHER_MAX_LEN,
> +        },
> +    };
> +
> +For this example the ports are set up with 1 RX and 1 TX queue using the
> +``rte_eth_rx_queue_setup()`` and ``rte_eth_tx_queue_setup()`` functions.
> +
> +The Ethernet port is then started:
> +
> +.. code-block:: c
> +
> +    ret = rte_eth_dev_start(portid);
> +    if (ret < 0)
> +        rte_exit(EXIT_FAILURE, "rte_eth_dev_start:err=%d, port=%u\n",
> +            ret, portid);
> +
> +
> +Finally the RX port is set in promiscuous mode:
> +
> +.. code-block:: c
> +
> +    rte_eth_promiscuous_enable(portid);
> +
> +
> +After that each port application assigns resources needed.
> +
> +.. code-block:: c
> +
> +    check_link_status(ioat_enabled_port_mask);
> +
> +    if (!cfg.nb_ports) {
> +        rte_exit(EXIT_FAILURE,
> +            "All available ports are disabled. Please set portmask.\n");
> +    }
> +
> +    /* 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 slave lcore.\n");
> +
> +    ret = 0;
> +
> +    if (copy_mode == COPY_MODE_IOAT_NUM) {
> +        assign_rawdevs();
> +    } else /* copy_mode == COPY_MODE_SW_NUM */ {
> +        assign_rings();
> +    }
> +
> +A link status is checked of each port enabled by port mask
> +using ``check_link_status()`` function.
> +
> +.. code-block:: c
> +
> +    /* Check the link status of all ports in up to 9s, and print them finally */
> +    static void
> +    check_link_status(uint32_t port_mask)
> +    {
> +
> +        uint16_t portid;
> +        struct rte_eth_link link;
> +
> +        cfg.nb_ports = 0;
> +
> +        printf("\nChecking link status\n");
> +        fflush(stdout);
> +        RTE_ETH_FOREACH_DEV(portid) {
> +            if (force_quit)
> +                return;
> +            if ((port_mask & (1 << portid)) == 0)
> +                continue;
> +
> +            store_port_nb(portid);
> +
> +            memset(&link, 0, sizeof(link));
> +            rte_eth_link_get(portid, &link);
> +
> +            /* Print link status */
> +            if (link.link_status) {
> +                printf(
> +                    "Port %d Link Up. Speed %u Mbps - %s\n",
> +                    portid, link.link_speed,
> +                    (link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
> +                    ("full-duplex") : ("half-duplex\n"));
> +            }
> +            else
> +                printf("Port %d Link Down\n", portid);
> +        }
> +    }
> +
> +Depending on mode set (whether copy should be done by software or by hardware)
> +special structures are assigned to each port. If software copy was chosen,
> +application have to assign ring structures for packet exchanging between lcores
> +assigned to ports.
> +
> +.. code-block:: c
> +
> +    static void
> +    assign_rings(void)
> +    {
> +        uint32_t i;
> +
> +        for (i = 0; i < cfg.nb_ports; i++) {
> +            char ring_name[20];
> +
> +            snprintf(ring_name, 20, "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);
> +
> +            if (cfg.ports[i].rx_to_tx_ring == NULL)
> +                rte_exit(EXIT_FAILURE, "%s\n",
> +                        rte_strerror(rte_errno));
> +        }
> +    }
> +
> +
> +When using hardware copy each port is assigned an IOAT device
> +(``assign_rawdevs()``) using IOAT Rawdev Driver API functions:
> +
> +.. code-block:: c
> +
> +    static void
> +    assign_rawdevs(void)
> +    {
> +        uint16_t nb_rawdev = 0;
> +        uint32_t i;
> +
> +        for (i = 0; i < cfg.nb_ports; i++) {
> +            struct rte_rawdev_info rdev_info = {0};
> +            rte_rawdev_info_get(0, &rdev_info);
> +
> +            if (strcmp(rdev_info.driver_name, "rawdev_ioat") == 0) {
> +                configure_rawdev_queue(i);
> +                cfg.ports[i].dev_id = i;
> +                ++nb_rawdev;
> +            }
> +        }
> +
> +        RTE_LOG(INFO, IOAT, "Number of used rawdevs: %u.\n", nb_rawdev);
> +
> +        if (nb_rawdev < cfg.nb_ports)
> +            rte_exit(EXIT_FAILURE, "Not enough IOAT rawdevs (%u) for ports (%u).\n",
> +                    nb_rawdev, cfg.nb_ports);
> +    }
> +
> +
> +The initialization of hardware device is done by ``rte_rawdev_configure()``
> +function and ``rte_rawdev_info`` struct. After configuration the device is
> +started using ``rte_rawdev_start()`` function. Each of the above operations
> +is done in ``configure_rawdev_queue()``.
> +
> +.. code-block:: c
> +
> +    static void
> +    configure_rawdev_queue(uint32_t dev_id)
> +    {
> +        struct rte_rawdev_info info = { .dev_private = &dev_config };
> +
> +        /* Configure hardware copy device */
> +        dev_config.ring_size = ring_size;
> +
> +        if (rte_rawdev_configure(dev_id, &info) != 0) {
> +            rte_exit(EXIT_FAILURE,
> +                "Error with rte_rawdev_configure()\n");
> +        }
> +        rte_rawdev_info_get(dev_id, &info);
> +        if (dev_config.ring_size != ring_size) {
> +            rte_exit(EXIT_FAILURE,
> +                "Error, ring size is not %d (%d)\n",
> +                ring_size, (int)dev_config.ring_size);
> +        }
> +        if (rte_rawdev_start(dev_id) != 0) {
> +            rte_exit(EXIT_FAILURE,
> +                "Error with rte_rawdev_start()\n");
> +        }
> +    }
> +
> +If initialization is successful memory for hardware device
> +statistics is allocated.
> +
> +Finally ``main()`` functions starts all processing lcores and starts
> +printing stats in a loop on master lcore. The application can be
> +interrupted and closed using ``Ctrl-C``. The master lcore waits for
> +all slave processes to finish, deallocates resources and exits.
> +
> +The processing lcores launching function are described below.
> +
> +The Lcores Launching Functions
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +As described above ``main()`` function invokes ``run_transmission()``
> +function in order to start processing for each lcore:
> +
> +.. code-block:: c
> +
> +    static void run_transmission(void)
> +    {
> +        uint32_t lcore_id = rte_lcore_id();
> +
> +        RTE_LOG(INFO, IOAT, "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);
> +        }
> +    }
> +
> +The function launches rx/tx processing functions on configured lcores
> +for each port using ``rte_eal_remote_launch()``. The configured ports,
> +their number and number of assigned lcores are stored in user-defined
> +``rxtx_transmission_config`` struct that is initialized before launching
> +tasks:
> +
> +.. code-block:: c
> +
> +    struct rxtx_transmission_config {
> +        struct rxtx_port_config ports[RTE_MAX_ETHPORTS];
> +        uint16_t nb_ports;
> +        uint16_t nb_lcores;
> +    };
> +
> +The Lcores Processing Functions
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +For receiving packets on each port an ``ioat_rx_port()`` function is used.
> +Depending on mode the user chose, it will enqueue packets to IOAT rawdev
> +and then invoke copy process (hardware copy), or perform software copy
> +of each packet using ``pktmbuf_sw_copy()`` function and enqueue them to
> +rte_ring:
> +
> +.. code-block:: c
> +
> +    /* Receive packets on one port and enqueue to IOAT rawdev or rte_ring. */
> +    static void
> +    ioat_rx_port(struct rxtx_port_config *rx_config)
> +    {
> +        uint32_t nb_rx, nb_enq, i;
> +        struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
> +
> +        nb_rx = rte_eth_rx_burst(rx_config->rx_portId, 0,
> +            pkts_burst, MAX_PKT_BURST);
> +
> +        if (nb_rx == 0)
> +            return;
> +
> +        port_statistics[rx_config->rx_portId].rx += nb_rx;
> +
> +        if (copy_mode == COPY_MODE_IOAT_NUM) {
> +            /* Perform packet hardware copy */
> +            nb_enq = ioat_enqueue_packets(rx_config,
> +                pkts_burst, nb_rx);
> +
> +            if (nb_enq > 0)
> +                rte_ioat_do_copies(rx_config->dev_id);
> +        } else {
> +            /* Perform packet software copy, free source packets */
> +            int ret;
> +            struct rte_mbuf *pkts_burst_copy[MAX_PKT_BURST];
> +
> +            ret = rte_pktmbuf_alloc_bulk(ioat_pktmbuf_pool,
> +                    pkts_burst_copy, nb_rx);
> +
> +            if (unlikely(ret < 0))
> +                rte_exit(EXIT_FAILURE, "Unable to allocate memory.\n");
> +
> +            for (i = 0; i < nb_rx; i++) {
> +                pktmbuf_sw_copy(pkts_burst[i], pkts_burst_copy[i]);
> +                rte_pktmbuf_free(pkts_burst[i]);
> +            }
> +
> +            nb_enq = rte_ring_enqueue_burst(rx_config->rx_to_tx_ring,
> +                (void *)pkts_burst_copy, nb_rx, NULL);
> +
> +            /* Free any not enqueued packets. */
> +            for (i = nb_enq; i < nb_rx; i++)
> +                rte_pktmbuf_free(pkts_burst_copy[i]);
> +        }
> +
> +        port_statistics[rx_config->rx_portId].copy_dropped
> +            += (nb_rx - nb_enq);
> +    }
> +
> +The packets are received in burst mode using ``rte_eth_rx_burst()``
> +function. When using hardware copy mode the packets are enqueued in
> +copying device's buffer using ``ioat_enqueue_packets()`` which calls
> +``rte_ioat_enqueue_copy()``. When all received packets are in the
> +buffer the copies are invoked by calling ``rte_ioat_do_copies()``.
> +Function ``rte_ioat_enqueue_copy()`` operates on physical address of
> +the packet. Structure ``rte_mbuf`` contains only physical address to
> +start of the data buffer (``buf_iova``). Thus the address is shifted
> +by ``addr_offset`` value in order to get pointer to ``rearm_data``
> +member of ``rte_mbuf``. That way the packet is copied all at once
> +(with data and metadata).
> +
> +.. code-block:: c
> +
> +    static uint32_t
> +    ioat_enqueue_packets(struct rxtx_port_config *rx_config,
> +        struct rte_mbuf **pkts, uint32_t nb_rx)
> +    {
> +        int ret;
> +        uint32_t i;
> +        struct rte_mbuf *pkts_copy[MAX_PKT_BURST];
> +
> +        const uint64_t addr_offset = RTE_PTR_DIFF(pkts[0]->buf_addr,
> +            &pkts[0]->rearm_data);
> +
> +        ret = rte_pktmbuf_alloc_bulk(ioat_pktmbuf_pool, pkts_copy, nb_rx);
> +
> +        if (unlikely(ret < 0))
> +            rte_exit(EXIT_FAILURE, "Unable to allocate memory.\n");
> +
> +        for (i = 0; i < nb_rx; i++) {
> +            /* Perform data copy */
> +            ret = rte_ioat_enqueue_copy(rx_config->dev_id,
> +                pkts[i]->buf_iova
> +                    - addr_offset,
> +                pkts_copy[i]->buf_iova
> +                    - addr_offset,
> +                rte_pktmbuf_data_len(pkts[i])
> +                    + addr_offset,
> +                (uintptr_t)pkts[i],
> +                (uintptr_t)pkts_copy[i],
> +                0 /* nofence */);
> +
> +            if (ret != 1)
> +                break;
> +        }
> +
> +        ret = i;
> +        /* Free any not enqueued packets. */
> +        for (; i < nb_rx; i++) {
> +            rte_pktmbuf_free(pkts[i]);
> +            rte_pktmbuf_free(pkts_copy[i]);
> +        }
> +
> +        return ret;
> +    }
> +
> +
> +All done copies are processed by ``ioat_tx_port()`` function. When using
> +hardware copy mode the function invokes ``rte_ioat_completed_copies()``
> +to gather copied packets. If software copy mode is used the function
> +dequeues copied packets from rte_ring. Then each packet MAC address
> +is changed if it was enabled. After that copies are sent in burst mode
> +using `` rte_eth_tx_burst()``.
> +
> +
> +.. code-block:: c
> +
> +    /* Transmit packets from IOAT rawdev/rte_ring for one port. */
> +    static void
> +    ioat_tx_port(struct rxtx_port_config *tx_config)
> +    {
> +        uint32_t i, nb_dq;
> +        struct rte_mbuf *mbufs_src[MAX_PKT_BURST];
> +        struct rte_mbuf *mbufs_dst[MAX_PKT_BURST];
> +
> +        if (copy_mode == COPY_MODE_IOAT_NUM) {
> +            /* Deque the mbufs from IOAT device. */
> +            nb_dq = rte_ioat_completed_copies(tx_config->dev_id,
> +                MAX_PKT_BURST, (void *)mbufs_src, (void *)mbufs_dst);
> +        } else {
> +            /* Deque the mbufs from rx_to_tx_ring. */
> +            nb_dq = rte_ring_dequeue_burst(tx_config->rx_to_tx_ring,
> +                (void *)mbufs_dst, MAX_PKT_BURST, NULL);
> +        }
> +
> +        if (nb_dq == 0)
> +            return;
> +
> +        /* Free source packets */
> +        if (copy_mode == COPY_MODE_IOAT_NUM) {
> +            for (i = 0; i < nb_dq; i++)
> +                rte_pktmbuf_free(mbufs_src[i]);
> +        }
> +
> +        /* Update macs if enabled */
> +        if (mac_updating) {
> +            for (i = 0; i < nb_dq; i++)
> +                update_mac_addrs(mbufs_dst[i],
> +                    tx_config->tx_portId);
> +        }
> +
> +        const uint16_t nb_tx = rte_eth_tx_burst(tx_config->tx_portId,
> +            0, (void *)mbufs_dst, nb_dq);
> +
> +        port_statistics[tx_config->tx_portId].tx += nb_tx;
> +
> +        /* Free any unsent packets. */
> +        if (unlikely(nb_tx < nb_dq)) {
> +            for (i = nb_tx; i < nb_dq; i++)
> +                rte_pktmbuf_free(mbufs_dst[i]);
> +        }
> +    }
> +
> +The Packet Copying Functions
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +In order to perform packet copy there is a user-defined function
> +``pktmbuf_sw_copy()`` used. It copies a whole packet by copying
> +metadata from source packet to new mbuf, and then copying a data
> +chunk of source packet. Both memory copies are done using
> +``rte_memcpy()``:
> +
> +.. code-block:: c
> +
> +    static inline void
> +    pktmbuf_sw_copy(struct rte_mbuf *src, struct rte_mbuf *dst)
> +    {
> +        /* Copy packet metadata */
> +        rte_memcpy(&dst->rearm_data,
> +            &src->rearm_data,
> +            offsetof(struct rte_mbuf, cacheline1)
> +                - offsetof(struct rte_mbuf, rearm_data));
> +
> +        /* Copy packet data */
> +        rte_memcpy(rte_pktmbuf_mtod(dst, char *),
> +            rte_pktmbuf_mtod(src, char *), src->data_len);
> +    }
> +
> +The metadata in this example is copied from ``rearm_data`` member of
> +``rte_mbuf`` struct up to ``cacheline1``.
> +
> +In order to understand why software packet copying is done as shown
> +above please refer to the "Mbuf Library" section of the
> +*DPDK Programmer's Guide*.
> \ No newline at end of file
> diff --git a/examples/Makefile b/examples/Makefile
> index de11dd487..3cb313d7d 100644
> --- a/examples/Makefile
> +++ b/examples/Makefile
> @@ -23,6 +23,9 @@ DIRS-$(CONFIG_RTE_LIBRTE_CRYPTODEV) += fips_validation
>  DIRS-$(CONFIG_RTE_LIBRTE_FLOW_CLASSIFY) += flow_classify
>  DIRS-y += flow_filtering
>  DIRS-y += helloworld
> +ifeq ($(CONFIG_RTE_LIBRTE_PMD_IOAT_RAWDEV),y)
> +DIRS-$(CONFIG_RTE_LIBRTE_PMD_IOAT_RAWDEV) += ioat
> +endif
>  DIRS-$(CONFIG_RTE_LIBRTE_PIPELINE) += ip_pipeline
>  ifeq ($(CONFIG_RTE_LIBRTE_LPM),y)
>  DIRS-$(CONFIG_RTE_IP_FRAG) += ip_reassembly
> diff --git a/examples/ioat/Makefile b/examples/ioat/Makefile
> new file mode 100644
> index 000000000..2a4d1da2d
> --- /dev/null
> +++ b/examples/ioat/Makefile
> @@ -0,0 +1,54 @@
> +# SPDX-License-Identifier: BSD-3-Clause
> +# Copyright(c) 2019 Intel Corporation
> +
> +# binary name
> +APP = ioatfwd
> +
> +# all source are stored in SRCS-y
> +SRCS-y := ioatfwd.c
> +
> +# Build using pkg-config variables if possible
> +ifeq ($(shell pkg-config --exists libdpdk && echo 0),0)
> +
> +all: shared
> +.PHONY: shared static
> +shared: build/$(APP)-shared
> +	ln -sf $(APP)-shared build/$(APP)
> +static: build/$(APP)-static
> +	ln -sf $(APP)-static build/$(APP)
> +
> +PC_FILE := $(shell pkg-config --path libdpdk)
> +CFLAGS += -O3 $(shell pkg-config --cflags libdpdk)
> +LDFLAGS_SHARED = $(shell pkg-config --libs libdpdk)
> +LDFLAGS_STATIC = -Wl,-Bstatic $(shell pkg-config --static --libs libdpdk)
> +
> +build/$(APP)-shared: $(SRCS-y) Makefile $(PC_FILE) | build
> +	$(CC) $(CFLAGS) $(SRCS-y) -o $@ $(LDFLAGS) $(LDFLAGS_SHARED)
> +
> +build/$(APP)-static: $(SRCS-y) Makefile $(PC_FILE) | build
> +	$(CC) $(CFLAGS) $(SRCS-y) -o $@ $(LDFLAGS) $(LDFLAGS_STATIC)
> +
> +build:
> +	@mkdir -p $@
> +
> +.PHONY: clean
> +clean:
> +	rm -f build/$(APP) build/$(APP)-static build/$(APP)-shared
> +	test -d build && rmdir -p build || true
> +
> +else # Build using legacy build system
> +ifeq ($(RTE_SDK),)
> +$(error "Please define RTE_SDK environment variable")
> +endif
> +
> +# Default target, detect a build directory, by looking for a path with a .config
> +RTE_TARGET ?= $(notdir $(abspath $(dir $(firstword $(wildcard $(RTE_SDK)/*/.config)))))
> +
> +include $(RTE_SDK)/mk/rte.vars.mk
> +
> +
> +CFLAGS += -O3
> +CFLAGS += $(WERROR_FLAGS)
> +
> +include $(RTE_SDK)/mk/rte.extapp.mk
> +endif
> diff --git a/examples/ioat/ioatfwd.c b/examples/ioat/ioatfwd.c
> new file mode 100644
> index 000000000..8463d82f3
> --- /dev/null
> +++ b/examples/ioat/ioatfwd.c
> @@ -0,0 +1,1010 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2019 Intel Corporation
> + */
> +
> +#include <stdint.h>
> +#include <getopt.h>
> +#include <signal.h>
> +#include <stdbool.h>
> +#include <unistd.h>
> +
> +#include <rte_malloc.h>
> +#include <rte_ethdev.h>
> +#include <rte_rawdev.h>
> +#include <rte_ioat_rawdev.h>
> +
> +/* size of ring used for software copying between rx and tx. */
> +#define RTE_LOGTYPE_IOAT RTE_LOGTYPE_USER1
> +#define MAX_PKT_BURST 32
> +#define MEMPOOL_CACHE_SIZE 512
> +#define MIN_POOL_SIZE 65536U
> +#define CMD_LINE_OPT_MAC_UPDATING "mac-updating"
> +#define CMD_LINE_OPT_NO_MAC_UPDATING "no-mac-updating"
> +#define CMD_LINE_OPT_PORTMASK "portmask"
> +#define CMD_LINE_OPT_NB_QUEUE "nb-queue"
> +#define CMD_LINE_OPT_COPY_TYPE "copy-type"
> +#define CMD_LINE_OPT_RING_SIZE "ring-size"
> +
> +/* 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 IOAT rawdev copy mode */
> +	uint16_t ioat_ids[MAX_RX_QUEUES_COUNT];
> +};
> +
> +struct rxtx_transmission_config {
> +	struct rxtx_port_config ports[RTE_MAX_ETHPORTS];
> +	uint16_t nb_ports;
> +	uint16_t nb_lcores;
> +};
> +
> +/* per-port statistics struct */
> +struct ioat_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 ioat_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_successful_enqueues;
> +	uint64_t total_failed_enqueues;
> +};
> +
> +typedef enum copy_mode_t {
> +#define COPY_MODE_SW "sw"
> +	COPY_MODE_SW_NUM,
> +#define COPY_MODE_IOAT "rawdev"
> +	COPY_MODE_IOAT_NUM,
> +	COPY_MODE_INVALID_NUM,
> +	COPY_MODE_SIZE_NUM = COPY_MODE_INVALID_NUM
> +} copy_mode_t;
> +
> +/* mask of enabled ports */
> +static uint32_t ioat_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;
> +
> +/* hardare copy mode enabled by default. */
> +static copy_mode_t copy_mode = COPY_MODE_IOAT_NUM;
> +
> +/* size of IOAT rawdev ring for hardware copy mode or
> + * rte_ring for software copy mode
> + */
> +static unsigned short ring_size = 2048;
> +
> +/* 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;
> +
> +/* ethernet addresses of ports */
> +static struct rte_ether_addr ioat_ports_eth_addr[RTE_MAX_ETHPORTS];
> +
> +static struct rte_eth_dev_tx_buffer *tx_buffer[RTE_MAX_ETHPORTS];
> +struct rte_mempool *ioat_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 IOAT rawdev device. */
> +static void
> +print_rawdev_stats(uint32_t dev_id, uint64_t *xstats,
> +	uint16_t nb_xstats, struct rte_rawdev_xstats_name *names_xstats)
> +{
> +	uint16_t i;
> +
> +	printf("\nIOAT channel %u", dev_id);
> +	for (i = 0; i < nb_xstats; i++)
> +		if (strstr(names_xstats[i].name, "enqueues"))
> +			printf("\n\t %s: %*"PRIu64,
> +				names_xstats[i].name,
> +				(int)(37 - strlen(names_xstats[i].name)),
> +				xstats[i]);
> +}
> +
> +static void
> +print_total_stats(struct total_statistics *ts)
> +{
> +	printf("\nAggregate statistics ==============================="
> +		"\nTotal packets sent: %28"PRIu64
> +		"\nTotal packets received: %24"PRIu64
> +		"\nTotal packets dropped: %25"PRIu64,
> +		ts->total_packets_tx,
> +		ts->total_packets_rx,
> +		ts->total_packets_dropped);
> +
> +	if (copy_mode == COPY_MODE_IOAT_NUM) {
> +		printf("\nTotal IOAT successful enqueues: %16"PRIu64
> +			"\nTotal IOAT failed enqueues: %20"PRIu64,
> +			ts->total_successful_enqueues,
> +			ts->total_failed_enqueues);
> +	}
> +
> +	printf("\n====================================================\n");
> +}
> +
> +/* Print out statistics on packets dropped. */
> +static void
> +print_stats(char *prgname)
> +{
> +	struct total_statistics ts;
> +	uint32_t i, port_id, dev_id;
> +	struct rte_rawdev_xstats_name *names_xstats;
> +	uint64_t *xstats;
> +	unsigned int *ids_xstats;
> +	unsigned int nb_xstats, id_fail_enq, id_succ_enq;
> +	char status_string[120]; /* 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_IOAT);
> +	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);
> +
> +	/* Allocate memory for xstats names and values */
> +	nb_xstats = rte_rawdev_xstats_names_get(
> +			cfg.ports[0].ioat_ids[0], NULL, 0);
> +
> +	names_xstats = malloc(sizeof(*names_xstats) * nb_xstats);
> +	if (names_xstats == NULL) {
> +		rte_exit(EXIT_FAILURE,
> +			"Error allocating xstat names memory\n");
> +	}
> +	rte_rawdev_xstats_names_get(cfg.ports[0].ioat_ids[0],
> +			names_xstats, nb_xstats);
> +
> +	ids_xstats = malloc(sizeof(*ids_xstats) * nb_xstats);
> +	if (ids_xstats == NULL) {
> +		rte_exit(EXIT_FAILURE,
> +			"Error allocating xstat ids_xstats memory\n");
> +	}
> +
> +	for (i = 0; i < nb_xstats; i++)
> +		ids_xstats[i] = i;
> +
> +	xstats = malloc(sizeof(*xstats) * nb_xstats);
> +	if (xstats == NULL) {
> +		rte_exit(EXIT_FAILURE,
> +			"Error allocating xstat memory\n");
> +	}
> +
> +	/* Get failed/successful enqueues stats index */
> +	id_fail_enq = id_succ_enq = nb_xstats;
> +	for (i = 0; i < nb_xstats; i++) {
> +		if (!strcmp(names_xstats[i].name, "failed_enqueues"))
> +			id_fail_enq = i;
> +		else if (!strcmp(names_xstats[i].name, "successful_enqueues"))
> +			id_succ_enq = i;
> +		if (id_fail_enq < nb_xstats && id_succ_enq < nb_xstats)
> +			break;
> +	}
> +	if (id_fail_enq == nb_xstats || id_succ_enq == nb_xstats) {
> +		rte_exit(EXIT_FAILURE,
> +			"Error getting failed/successful enqueues stats index\n");
> +	}
> +
> +	while (!force_quit) {
> +		/* Sleep for 1 second each round - init sleep allows reading
> +		 * messages from app startup.
> +		 */
> +		sleep(1);
> +
> +		/* Clear screen and move to top left */
> +		printf("%s%s", clr, topLeft);
> +
> +		memset(&ts, 0, sizeof(struct total_statistics));
> +
> +		printf("%s", status_string);
> +
> +		for (i = 0; i < cfg.nb_ports; i++) {
> +			port_id = cfg.ports[i].rxtx_port;
> +			print_port_stats(port_id);
> +
> +			ts.total_packets_dropped +=
> +				port_statistics.tx_dropped[port_id]
> +				+ port_statistics.copy_dropped[port_id];
> +			ts.total_packets_tx += port_statistics.tx[port_id];
> +			ts.total_packets_rx += port_statistics.rx[port_id];
> +
> +			if (copy_mode == COPY_MODE_IOAT_NUM) {
> +				uint32_t j;
> +
> +				for (j = 0; j < cfg.ports[i].nb_queues; j++) {
> +					dev_id = cfg.ports[i].ioat_ids[j];
> +					rte_rawdev_xstats_get(dev_id,
> +						ids_xstats, xstats, nb_xstats);
> +
> +					print_rawdev_stats(dev_id, xstats,
> +						nb_xstats, names_xstats);
> +
> +					ts.total_successful_enqueues +=
> +						xstats[id_succ_enq];
> +					ts.total_failed_enqueues +=
> +						xstats[id_fail_enq];
> +				}
> +			}
> +		}
> +		printf("\n");
> +
> +		print_total_stats(&ts);
> +	}
> +
> +	free(names_xstats);
> +	free(xstats);
> +	free(ids_xstats);
> +}
> +
> +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->d_addr.addr_bytes[0];
> +	*((uint64_t *)tmp) = 0x000000000002 + ((uint64_t)dest_portid << 40);
> +
> +	/* src addr */
> +	rte_ether_addr_copy(&ioat_ports_eth_addr[dest_portid], &eth->s_addr);
> +}
> +
> +static inline void
> +pktmbuf_sw_copy(struct rte_mbuf *src, struct rte_mbuf *dst)
> +{
> +	/* Copy packet metadata */
> +	rte_memcpy(&dst->rearm_data,
> +		&src->rearm_data,
> +		offsetof(struct rte_mbuf, cacheline1)
> +			- offsetof(struct rte_mbuf, rearm_data));
> +
> +	/* Copy packet data */
> +	rte_memcpy(rte_pktmbuf_mtod(dst, char *),
> +		rte_pktmbuf_mtod(src, char *), src->data_len);
> +}
> +
> +static uint32_t
> +ioat_enqueue_packets(struct rte_mbuf **pkts,
> +	uint32_t nb_rx, uint16_t dev_id)
> +{
> +	int ret;
> +	uint32_t i;
> +	struct rte_mbuf *pkts_copy[MAX_PKT_BURST];
> +
> +	const uint64_t addr_offset = RTE_PTR_DIFF(pkts[0]->buf_addr,
> +		&pkts[0]->rearm_data);
> +
> +	ret = rte_mempool_get_bulk(ioat_pktmbuf_pool,
> +			(void *)pkts_copy, nb_rx);
> +
> +	if (unlikely(ret < 0))
> +		rte_exit(EXIT_FAILURE, "Unable to allocate memory.\n");
> +
> +	for (i = 0; i < nb_rx; i++) {
> +		/* Perform data copy */
> +		ret = rte_ioat_enqueue_copy(dev_id,
> +			pkts[i]->buf_iova
> +				- addr_offset,
> +			pkts_copy[i]->buf_iova
> +				- addr_offset,
> +			rte_pktmbuf_data_len(pkts[i])
> +				+ addr_offset,
> +			(uintptr_t)pkts[i],
> +			(uintptr_t)pkts_copy[i],
> +			0 /* nofence */);
> +
> +		if (ret != 1)
> +			break;
> +	}
> +
> +	ret = i;
> +	/* Free any not enqueued packets. */
> +	rte_mempool_put_bulk(ioat_pktmbuf_pool, (void *)&pkts[i], nb_rx - i);
> +	rte_mempool_put_bulk(ioat_pktmbuf_pool, (void *)&pkts_copy[i],
> +		nb_rx - i);
> +
> +
> +	return ret;
> +}
> +
> +/* Receive packets on one port and enqueue to IOAT rawdev or rte_ring. */
> +static void
> +ioat_rx_port(struct rxtx_port_config *rx_config)
> +{
> +	uint32_t nb_rx, nb_enq, i, j;
> +	struct rte_mbuf *pkts_burst[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)
> +			continue;
> +
> +		port_statistics.rx[rx_config->rxtx_port] += nb_rx;
> +
> +		if (copy_mode == COPY_MODE_IOAT_NUM) {
> +			/* Perform packet hardware copy */
> +			nb_enq = ioat_enqueue_packets(pkts_burst,
> +				nb_rx, rx_config->ioat_ids[i]);
> +			if (nb_enq > 0)
> +				rte_ioat_do_copies(rx_config->ioat_ids[i]);
> +		} else {
> +			/* Perform packet software copy, free source packets */
> +			int ret;
> +			struct rte_mbuf *pkts_burst_copy[MAX_PKT_BURST];
> +
> +			ret = rte_mempool_get_bulk(ioat_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_sw_copy(pkts_burst[j],
> +					pkts_burst_copy[j]);
> +
> +			rte_mempool_put_bulk(ioat_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(ioat_pktmbuf_pool,
> +				(void *)&pkts_burst_copy[nb_enq],
> +				nb_rx - nb_enq);
> +		}
> +
> +		port_statistics.copy_dropped[rx_config->rxtx_port] +=
> +			(nb_rx - nb_enq);
> +	}
> +}
> +
> +/* Transmit packets from IOAT rawdev/rte_ring for one port. */
> +static void
> +ioat_tx_port(struct rxtx_port_config *tx_config)
> +{
> +	uint32_t i, j, nb_dq = 0;
> +	struct rte_mbuf *mbufs_src[MAX_PKT_BURST];
> +	struct rte_mbuf *mbufs_dst[MAX_PKT_BURST];
> +
> +	if (copy_mode == COPY_MODE_IOAT_NUM) {
> +		/* Deque the mbufs from IOAT device. */
> +		for (i = 0; i < tx_config->nb_queues; i++) {
> +			nb_dq = rte_ioat_completed_copies(
> +				tx_config->ioat_ids[i], MAX_PKT_BURST,
> +				(void *)mbufs_src, (void *)mbufs_dst);
> +
> +			if (nb_dq == 0)
> +				break;
> +
> +			rte_mempool_put_bulk(ioat_pktmbuf_pool,
> +				(void *)mbufs_src, nb_dq);
> +
> +			/* Update macs if enabled */
> +			if (mac_updating) {
> +				for (j = 0; j < nb_dq; j++)
> +					update_mac_addrs(mbufs_dst[j],
> +						tx_config->rxtx_port);
> +			}
> +
> +			const uint16_t nb_tx = rte_eth_tx_burst(
> +				tx_config->rxtx_port, 0,
> +				(void *)mbufs_dst, nb_dq);
> +
> +			port_statistics.tx[tx_config->rxtx_port] += nb_tx;
> +
> +			/* Free any unsent packets. */
> +			if (unlikely(nb_tx < nb_dq))
> +				rte_mempool_put_bulk(ioat_pktmbuf_pool,
> +					(void *)&mbufs_dst[nb_tx],
> +					nb_dq - nb_tx);
> +		}
> +	} else {
> +		/* Deque the mbufs from rx_to_tx_ring. */
> +		nb_dq = rte_ring_dequeue_burst(tx_config->rx_to_tx_ring,
> +			(void *)mbufs_dst, MAX_PKT_BURST, NULL);
> +
> +		if (nb_dq == 0)
> +			return;
> +
> +		/* Update macs if enabled */
> +		if (mac_updating) {
> +			for (i = 0; i < nb_dq; i++)
> +				update_mac_addrs(mbufs_dst[i],
> +					tx_config->rxtx_port);
> +		}
> +
> +		const uint16_t nb_tx = rte_eth_tx_burst(tx_config->rxtx_port,
> +			0, (void *)mbufs_dst, nb_dq);
> +
> +		port_statistics.tx[tx_config->rxtx_port] += nb_tx;
> +
> +		/* Free any unsent packets. */
> +		if (unlikely(nb_tx < nb_dq))
> +			rte_mempool_put_bulk(ioat_pktmbuf_pool,
> +				(void *)&mbufs_dst[nb_tx],
> +				nb_dq - nb_tx);
> +	}
> +}
> +
> +/* Main rx processing loop for IOAT rawdev. */
> +static void
> +rx_main_loop(void)
> +{
> +	uint16_t i;
> +	uint16_t nb_ports = cfg.nb_ports;
> +
> +	RTE_LOG(INFO, IOAT, "Entering main rx loop for copy on lcore %u\n",
> +		rte_lcore_id());
> +
> +	while (!force_quit)
> +		for (i = 0; i < nb_ports; i++)
> +			ioat_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, IOAT, "Entering main tx loop for copy on lcore %u\n",
> +		rte_lcore_id());
> +
> +	while (!force_quit)
> +		for (i = 0; i < nb_ports; i++)
> +			ioat_tx_port(&cfg.ports[i]);
> +}
> +
> +/* Main rx and tx loop if only one slave lcore available */
> +static void
> +rxtx_main_loop(void)
> +{
> +	uint16_t i;
> +	uint16_t nb_ports = cfg.nb_ports;
> +
> +	RTE_LOG(INFO, IOAT, "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++) {
> +			ioat_rx_port(&cfg.ports[i]);
> +			ioat_tx_port(&cfg.ports[i]);
> +		}
> +}
> +
> +static void start_forwarding_cores(void)
> +{
> +	uint32_t lcore_id = rte_lcore_id();
> +
> +	RTE_LOG(INFO, IOAT, "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);
> +	}
> +}
> +
> +/* Display usage */
> +static void
> +ioat_usage(const char *prgname)
> +{
> +	printf("%s [EAL options] -- -p PORTMASK [-q NQ]\n"
> +		"  -p --portmask: hexadecimal bitmask of ports to configure\n"
> +		"  -q NQ: number of RX queues per port (default is 1)\n"
> +		"  --[no-]mac-updating: Enable or disable MAC addresses updating (enabled by default)\n"
> +		"      When enabled:\n"
> +		"       - The source MAC address is replaced by the TX port MAC address\n"
> +		"       - The destination MAC address is replaced by 02:00:00:00:00:TX_PORT_ID\n"
> +		"  -c --copy-type CT: type of copy: sw|rawdev\n"
> +		"  -s --ring-size RS: size of IOAT rawdev ring for hardware copy mode or rte_ring for software copy mode\n",
> +	       prgname);
> +}
> +
> +static int
> +ioat_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 -1;
> +
> +	return pm;
> +}
> +
> +static copy_mode_t
> +ioat_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_IOAT) == 0)
> +		return COPY_MODE_IOAT_NUM;
> +
> +	return COPY_MODE_INVALID_NUM;
> +}
> +
> +/* Parse the argument given in the command line of the application */
> +static int
> +ioat_parse_args(int argc, char **argv, unsigned int nb_ports)
> +{
> +	static const char short_options[] =
> +		"p:"  /* portmask */
> +		"q:"  /* number of RX queues per port */
> +		"c:"  /* copy type (sw|rawdev) */
> +		"s:"  /* ring size */
> +		;
> +
> +	static const struct option lgopts[] = {
> +		{CMD_LINE_OPT_MAC_UPDATING, no_argument, &mac_updating, 1},
> +		{CMD_LINE_OPT_NO_MAC_UPDATING, no_argument, &mac_updating, 0},
> +		{CMD_LINE_OPT_PORTMASK, required_argument, NULL, 'p'},
> +		{CMD_LINE_OPT_NB_QUEUE, required_argument, NULL, 'q'},
> +		{CMD_LINE_OPT_COPY_TYPE, required_argument, NULL, 'c'},
> +		{CMD_LINE_OPT_RING_SIZE, required_argument, NULL, 's'},
> +		{NULL, 0, 0, 0}
> +	};
> +
> +	const unsigned int default_port_mask = (1 << nb_ports) - 1;
> +	int opt, ret;
> +	char **argvopt;
> +	int option_index;
> +	char *prgname = argv[0];
> +
> +	ioat_enabled_port_mask = default_port_mask;
> +	argvopt = argv;
> +
> +	while ((opt = getopt_long(argc, argvopt, short_options,
> +				  lgopts, &option_index)) != EOF) {
> +
> +		switch (opt) {
> +		/* portmask */
> +		case 'p':
> +			ioat_enabled_port_mask = ioat_parse_portmask(optarg);
> +			if (ioat_enabled_port_mask & ~default_port_mask ||
> +					ioat_enabled_port_mask <= 0) {
> +				printf("Invalid portmask, %s, suggest 0x%x\n",
> +						optarg, default_port_mask);
> +				ioat_usage(prgname);
> +				return -1;
> +			}
> +			break;
> +
> +		case 'q':
> +			nb_queues = atoi(optarg);
> +			if (nb_queues == 0 || nb_queues > MAX_RX_QUEUES_COUNT) {
> +				printf("Invalid RX queues number %s. Max %u\n",
> +					optarg, MAX_RX_QUEUES_COUNT);
> +				ioat_usage(prgname);
> +				return -1;
> +			}
> +			break;
> +
> +		case 'c':
> +			copy_mode = ioat_parse_copy_mode(optarg);
> +			if (copy_mode == COPY_MODE_INVALID_NUM) {
> +				printf("Invalid copy type. Use: sw, rawdev\n");
> +				ioat_usage(prgname);
> +				return -1;
> +			}
> +			break;
> +
> +		case 's':
> +			ring_size = atoi(optarg);
> +			if (ring_size == 0) {
> +				printf("Invalid ring size, %s.\n", optarg);
> +				ioat_usage(prgname);
> +				return -1;
> +			}
> +			break;
> +
> +		/* long options */
> +		case 0:
> +			break;
> +
> +		default:
> +			ioat_usage(prgname);
> +			return -1;
> +		}
> +	}
> +
> +	printf("MAC updating %s\n", mac_updating ? "enabled" : "disabled");
> +	if (optind >= 0)
> +		argv[optind-1] = prgname;
> +
> +	ret = optind-1;
> +	optind = 1; /* reset getopt lib */
> +	return ret;
> +}
> +
> +/* 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 retval = 0;
> +
> +	printf("\nChecking link status\n");
> +	RTE_ETH_FOREACH_DEV(portid) {
> +		if ((port_mask & (1 << portid)) == 0)
> +			continue;
> +
> +		memset(&link, 0, sizeof(link));
> +		rte_eth_link_get(portid, &link);
> +
> +		/* Print link status */
> +		if (link.link_status) {
> +			printf(
> +				"Port %d Link Up. Speed %u Mbps - %s\n",
> +				portid, link.link_speed,
> +				(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
> +				("full-duplex") : ("half-duplex\n"));
> +			retval = 1;
> +		} else
> +			printf("Port %d Link Down\n", portid);
> +	}
> +	return retval;
> +}
> +
> +static void
> +configure_rawdev_queue(uint32_t dev_id)
> +{
> +	struct rte_ioat_rawdev_config dev_config = { .ring_size = ring_size };
> +	struct rte_rawdev_info info = { .dev_private = &dev_config };
> +
> +	if (rte_rawdev_configure(dev_id, &info) != 0) {
> +		rte_exit(EXIT_FAILURE,
> +			"Error with rte_rawdev_configure()\n");
> +	}
> +	if (rte_rawdev_start(dev_id) != 0) {
> +		rte_exit(EXIT_FAILURE,
> +			"Error with rte_rawdev_start()\n");
> +	}
> +}
> +
> +static void
> +assign_rawdevs(void)
> +{
> +	uint16_t nb_rawdev = 0, rdev_id = 0;
> +	uint32_t i, j;
> +
> +	for (i = 0; i < cfg.nb_ports; i++) {
> +		for (j = 0; j < cfg.ports[i].nb_queues; j++) {
> +			struct rte_rawdev_info rdev_info = { 0 };
> +
> +			do {
> +				if (rdev_id == rte_rawdev_count())
> +					goto end;
> +				rte_rawdev_info_get(rdev_id++, &rdev_info);
> +			} while (strcmp(rdev_info.driver_name,
> +				IOAT_PMD_RAWDEV_NAME_STR) != 0);
> +
> +			cfg.ports[i].ioat_ids[j] = rdev_id - 1;
> +			configure_rawdev_queue(cfg.ports[i].ioat_ids[j]);
> +			++nb_rawdev;
> +		}
> +	}
> +end:
> +	if (nb_rawdev < cfg.nb_ports * cfg.ports[0].nb_queues)
> +		rte_exit(EXIT_FAILURE,
> +			"Not enough IOAT rawdevs (%u) for all queues (%u).\n",
> +			nb_rawdev, cfg.nb_ports * cfg.ports[0].nb_queues);
> +	RTE_LOG(INFO, IOAT, "Number of used rawdevs: %u.\n", nb_rawdev);
> +}
> +
> +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));
> +	}
> +}
> +
> +/*
> + * 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 */
> +	static const struct rte_eth_conf port_conf = {
> +		.rxmode = {
> +			.mq_mode        = ETH_MQ_RX_RSS,
> +			.max_rx_pkt_len = RTE_ETHER_MAX_LEN
> +		},
> +		.rx_adv_conf = {
> +			.rss_conf = {
> +				.rss_key = NULL,
> +				.rss_hf = ETH_RSS_PROTO_MASK,
> +			}
> +		}
> +	};
> +
> +	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 ((ioat_enabled_port_mask & (1 << portid)) == 0) {
> +		printf("Skipping disabled port %u\n", portid);
> +		return;
> +	}
> +
> +	/* Init port */
> +	printf("Initializing port %u... ", portid);
> +	fflush(stdout);
> +	rte_eth_dev_info_get(portid, &dev_info);
> +	local_port_conf.rx_adv_conf.rss_conf.rss_hf &=
> +		dev_info.flow_type_rss_offloads;
> +	if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
> +		local_port_conf.txmode.offloads |=
> +			DEV_TX_OFFLOAD_MBUF_FAST_FREE;
> +	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, &ioat_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);
> +
> +	/* Initialize TX buffers */
> +	tx_buffer[portid] = rte_zmalloc_socket("tx_buffer",
> +			RTE_ETH_TX_BUFFER_SIZE(MAX_PKT_BURST), 0,
> +			rte_eth_dev_socket_id(portid));
> +	if (tx_buffer[portid] == NULL)
> +		rte_exit(EXIT_FAILURE,
> +			"Cannot allocate buffer for tx on port %u\n",
> +			portid);
> +
> +	rte_eth_tx_buffer_init(tx_buffer[portid], MAX_PKT_BURST);
> +
> +	ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[portid],
> +			rte_eth_tx_buffer_count_callback,
> +			&port_statistics.tx_dropped[portid]);
> +	if (ret < 0)
> +		rte_exit(EXIT_FAILURE,
> +			"Cannot set error callback for tx buffer on port %u\n",
> +			portid);
> +
> +	/* Start device */
> +	ret = rte_eth_dev_start(portid);
> +	if (ret < 0)
> +		rte_exit(EXIT_FAILURE,
> +			"rte_eth_dev_start:err=%d, port=%u\n",
> +			ret, portid);
> +
> +	rte_eth_promiscuous_enable(portid);
> +
> +	printf("Port %u, MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n\n",
> +			portid,
> +			ioat_ports_eth_addr[portid].addr_bytes[0],
> +			ioat_ports_eth_addr[portid].addr_bytes[1],
> +			ioat_ports_eth_addr[portid].addr_bytes[2],
> +			ioat_ports_eth_addr[portid].addr_bytes[3],
> +			ioat_ports_eth_addr[portid].addr_bytes[4],
> +			ioat_ports_eth_addr[portid].addr_bytes[5]);
> +
> +	cfg.ports[cfg.nb_ports].rxtx_port = portid;
> +	cfg.ports[cfg.nb_ports++].nb_queues = nb_queues;
> +}
> +
> +static void
> +signal_handler(int signum)
> +{
> +	if (signum == SIGINT || signum == SIGTERM) {
> +		printf("\n\nSignal %d received, preparing to exit...\n",
> +			signum);
> +		force_quit = true;
> +	}
> +}
> +
> +int
> +main(int argc, char **argv)
> +{
> +	int ret;
> +	uint16_t nb_ports, portid;
> +	uint32_t i;
> +	unsigned int nb_mbufs;
> +
> +	/* Init EAL */
> +	ret = rte_eal_init(argc, argv);
> +	if (ret < 0)
> +		rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
> +	argc -= ret;
> +	argv += ret;
> +
> +	force_quit = false;
> +	signal(SIGINT, signal_handler);
> +	signal(SIGTERM, 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 = ioat_parse_args(argc, argv, nb_ports);
> +	if (ret < 0)
> +		rte_exit(EXIT_FAILURE, "Invalid IOAT arguments\n");
> +
> +	nb_mbufs = RTE_MAX(nb_ports * (nb_queues * (nb_rxd + nb_txd +
> +		4 * MAX_PKT_BURST) + rte_lcore_count() * MEMPOOL_CACHE_SIZE),
> +		MIN_POOL_SIZE);
> +
> +	/* Create the mbuf pool */
> +	ioat_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", nb_mbufs,
> +		MEMPOOL_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
> +		rte_socket_id());
> +	if (ioat_pktmbuf_pool == NULL)
> +		rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
> +
> +	/* Initialise each port */
> +	cfg.nb_ports = 0;
> +	RTE_ETH_FOREACH_DEV(portid)
> +		port_init(portid, ioat_pktmbuf_pool, nb_queues);
> +
> +	/* Initialize port xstats */
> +	memset(&port_statistics, 0, sizeof(port_statistics));
> +
> +	while (!check_link_status(ioat_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 slave lcore.\n");
> +
> +	if (copy_mode == COPY_MODE_IOAT_NUM)
> +		assign_rawdevs();
> +	else /* copy_mode == COPY_MODE_SW_NUM */
> +		assign_rings();
> +
> +	start_forwarding_cores();
> +	/* master 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);
> +		rte_eth_dev_stop(cfg.ports[i].rxtx_port);
> +		rte_eth_dev_close(cfg.ports[i].rxtx_port);
> +		if (copy_mode == COPY_MODE_IOAT_NUM) {
> +			for (j = 0; j < cfg.ports[i].nb_queues; j++) {
> +				printf("Stopping rawdev %d\n",
> +					cfg.ports[i].ioat_ids[j]);
> +				rte_rawdev_stop(cfg.ports[i].ioat_ids[j]);
> +			}
> +		} else /* copy_mode == COPY_MODE_SW_NUM */
> +			rte_ring_free(cfg.ports[i].rx_to_tx_ring);
> +	}
> +
> +	printf("Bye...\n");
> +	return 0;
> +}
> diff --git a/examples/ioat/meson.build b/examples/ioat/meson.build
> new file mode 100644
> index 000000000..ff56dc99c
> --- /dev/null
> +++ b/examples/ioat/meson.build
> @@ -0,0 +1,13 @@
> +# SPDX-License-Identifier: BSD-3-Clause
> +# Copyright(c) 2019 Intel Corporation
> +
> +# meson file, for building this example as part of a main DPDK build.
> +#
> +# To build this example as a standalone application with an already-installed
> +# DPDK instance, use 'make'
> +
> +deps += ['pmd_ioat']
> +
> +sources = files(
> +	'ioatfwd.c'
> +)
> diff --git a/examples/meson.build b/examples/meson.build
> index a046b74ad..c2e18b59b 100644
> --- a/examples/meson.build
> +++ b/examples/meson.build

You'll need to add the pmd_ioat dependency to this example it seems:

   examples/meson.build:89:4: ERROR: Problem encountered: Missing dependency "pmd_ioat" for example "ioat"

> @@ -16,6 +16,7 @@ all_examples = [
>  	'eventdev_pipeline', 'exception_path',
>  	'fips_validation', 'flow_classify',
>  	'flow_filtering', 'helloworld',
> +	'ioat',
>  	'ip_fragmentation', 'ip_pipeline',
>  	'ip_reassembly', 'ipsec-secgw',
>  	'ipv4_multicast', 'kni',