Re: [RFC] librte_pmd_null: Add null PMD

[Tetsuya Mukawa <mukawa-AlSX/UN32fvPDbFq/vQRIQ@public.gmane.org>]

Hi Ivan

(2014/09/22 16:46), Ivan Boule wrote:
>
> This is a "nice to have" PMD.
>
> Just a minor comment.
> I guess it should be NTT instead of Intel in the following comment
> "#     * Neither the name of Intel Corporation nor the names of its".
>
I appreciate your comment. I will rewrite and post it again.

Regards,
Tetsuya


> Regards,
> Ivan
>
>>
>> Signed-off-by: Tetsuya Mukawa <mukawa-AlSX/UN32fvPDbFq/vQRIQ@public.gmane.org>
>> ---
>>   config/common_bsdapp               |   5 +
>>   config/common_linuxapp             |   5 +
>>   lib/Makefile                       |   1 +
>>   lib/librte_pmd_null/Makefile       |  58 +++++
>>   lib/librte_pmd_null/rte_eth_null.c | 474
>> +++++++++++++++++++++++++++++++++++++
>>   5 files changed, 543 insertions(+)
>>   create mode 100644 lib/librte_pmd_null/Makefile
>>   create mode 100644 lib/librte_pmd_null/rte_eth_null.c
>>
>> diff --git a/config/common_bsdapp b/config/common_bsdapp
>> index 645949f..a86321f 100644
>> --- a/config/common_bsdapp
>> +++ b/config/common_bsdapp
>> @@ -226,6 +226,11 @@ CONFIG_RTE_LIBRTE_PMD_PCAP=y
>>   CONFIG_RTE_LIBRTE_PMD_BOND=y
>>
>>   #
>> +# Compile null PMD
>> +#
>> +CONFIG_RTE_LIBRTE_PMD_NULL=y
>> +
>> +#
>>   # Do prefetch of packet data within PMD driver receive function
>>   #
>>   CONFIG_RTE_PMD_PACKET_PREFETCH=y
>> diff --git a/config/common_linuxapp b/config/common_linuxapp
>> index 5bee910..e3bd8c0 100644
>> --- a/config/common_linuxapp
>> +++ b/config/common_linuxapp
>> @@ -254,6 +254,11 @@ CONFIG_RTE_LIBRTE_PMD_BOND=y
>>   CONFIG_RTE_LIBRTE_PMD_XENVIRT=n
>>
>>   #
>> +# Compile null PMD
>> +#
>> +CONFIG_RTE_LIBRTE_PMD_NULL=y
>> +
>> +#
>>   # Do prefetch of packet data within PMD driver receive function
>>   #
>>   CONFIG_RTE_PMD_PACKET_PREFETCH=y
>> diff --git a/lib/Makefile b/lib/Makefile
>> index 10c5bb3..61d6ed1 100644
>> --- a/lib/Makefile
>> +++ b/lib/Makefile
>> @@ -50,6 +50,7 @@ DIRS-$(CONFIG_RTE_LIBRTE_PMD_PCAP) += librte_pmd_pcap
>>   DIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += librte_pmd_virtio
>>   DIRS-$(CONFIG_RTE_LIBRTE_VMXNET3_PMD) += librte_pmd_vmxnet3
>>   DIRS-$(CONFIG_RTE_LIBRTE_PMD_XENVIRT) += librte_pmd_xenvirt
>> +DIRS-$(CONFIG_RTE_LIBRTE_PMD_NULL) += librte_pmd_null
>>   DIRS-$(CONFIG_RTE_LIBRTE_HASH) += librte_hash
>>   DIRS-$(CONFIG_RTE_LIBRTE_LPM) += librte_lpm
>>   DIRS-$(CONFIG_RTE_LIBRTE_ACL) += librte_acl
>> diff --git a/lib/librte_pmd_null/Makefile b/lib/librte_pmd_null/Makefile
>> new file mode 100644
>> index 0000000..e017918
>> --- /dev/null
>> +++ b/lib/librte_pmd_null/Makefile
>> @@ -0,0 +1,58 @@
>> +#   BSD LICENSE
>> +#
>> +#   Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
>> +#   All rights reserved.
>> +#
>> +#   Redistribution and use in source and binary forms, with or without
>> +#   modification, are permitted provided that the following conditions
>> +#   are met:
>> +#
>> +#     * Redistributions of source code must retain the above copyright
>> +#       notice, this list of conditions and the following disclaimer.
>> +#     * Redistributions in binary form must reproduce the above
>> copyright
>> +#       notice, this list of conditions and the following disclaimer in
>> +#       the documentation and/or other materials provided with the
>> +#       distribution.
>> +#     * Neither the name of Intel Corporation nor the names of its
>> +#       contributors may be used to endorse or promote products derived
>> +#       from this software without specific prior written permission.
>> +#
>> +#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
>> +#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
>> +#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
>> FITNESS FOR
>> +#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
>> COPYRIGHT
>> +#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
>> INCIDENTAL,
>> +#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
>> +#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
>> USE,
>> +#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
>> ON ANY
>> +#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>> +#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
>> THE USE
>> +#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
>> DAMAGE.
>> +
>> +include $(RTE_SDK)/mk/rte.vars.mk
>> +
>> +#
>> +# library name
>> +#
>> +LIB = librte_pmd_null.a
>> +
>> +CFLAGS += -O3
>> +CFLAGS += $(WERROR_FLAGS)
>> +
>> +#
>> +# all source are stored in SRCS-y
>> +#
>> +SRCS-$(CONFIG_RTE_LIBRTE_PMD_NULL) += rte_eth_null.c
>> +
>> +#
>> +# Export include files
>> +#
>> +SYMLINK-y-include +=
>> +
>> +# this lib depends upon:
>> +DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_NULL) += lib/librte_mbuf
>> +DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_NULL) += lib/librte_ether
>> +DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_NULL) += lib/librte_malloc
>> +DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_NULL) += lib/librte_kvargs
>> +
>> +include $(RTE_SDK)/mk/rte.lib.mk
>> diff --git a/lib/librte_pmd_null/rte_eth_null.c
>> b/lib/librte_pmd_null/rte_eth_null.c
>> new file mode 100644
>> index 0000000..1a81843
>> --- /dev/null
>> +++ b/lib/librte_pmd_null/rte_eth_null.c
>> @@ -0,0 +1,474 @@
>> +/*-
>> + *   BSD LICENSE
>> + *
>> + *   Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
>> + *   All rights reserved.
>> + *
>> + *   Redistribution and use in source and binary forms, with or without
>> + *   modification, are permitted provided that the following conditions
>> + *   are met:
>> + *
>> + *     * Redistributions of source code must retain the above copyright
>> + *       notice, this list of conditions and the following disclaimer.
>> + *     * Redistributions in binary form must reproduce the above
>> copyright
>> + *       notice, this list of conditions and the following
>> disclaimer in
>> + *       the documentation and/or other materials provided with the
>> + *       distribution.
>> + *     * Neither the name of Intel Corporation nor the names of its
>> + *       contributors may be used to endorse or promote products
>> derived
>> + *       from this software without specific prior written permission.
>> + *
>> + *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
>> CONTRIBUTORS
>> + *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
>> + *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
>> FITNESS FOR
>> + *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
>> COPYRIGHT
>> + *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
>> INCIDENTAL,
>> + *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
>> + *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
>> OF USE,
>> + *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
>> ON ANY
>> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
>> TORT
>> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
>> THE USE
>> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
>> DAMAGE.
>> + */
>> +
>> +#include <rte_mbuf.h>
>> +#include <rte_ethdev.h>
>> +#include <rte_malloc.h>
>> +#include <rte_memcpy.h>
>> +#include <rte_dev.h>
>> +#include <rte_kvargs.h>
>> +
>> +#define ETH_NULL_PACKET_SIZE_ARG    "size"
>> +#define ETH_NULL_PACKET_COPY_ARG    "copy"
>> +
>> +static unsigned default_packet_size = 64;
>> +static unsigned default_packet_copy;
>> +
>> +static const char const *valid_arguments[] = {
>> +    ETH_NULL_PACKET_SIZE_ARG,
>> +    ETH_NULL_PACKET_COPY_ARG,
>> +    NULL
>> +};
>> +
>> +struct pmd_internals;
>> +
>> +struct null_queue {
>> +    struct pmd_internals *internals;
>> +
>> +    struct rte_mempool *mb_pool;
>> +    struct rte_mbuf *dummy_packet;
>> +
>> +    rte_atomic64_t rx_pkts;
>> +    rte_atomic64_t tx_pkts;
>> +    rte_atomic64_t err_pkts;
>> +};
>> +
>> +struct pmd_internals {
>> +    unsigned packet_size;
>> +    unsigned packet_copy;
>> +    unsigned numa_node;
>> +
>> +    unsigned nb_rx_queues;
>> +    unsigned nb_tx_queues;
>> +
>> +    struct null_queue rx_null_queues[1];
>> +    struct null_queue tx_null_queues[1];
>> +};
>> +
>> +
>> +static struct ether_addr eth_addr = { .addr_bytes = {0} };
>> +static const char *drivername = "Null PMD";
>> +static struct rte_eth_link pmd_link = {
>> +    .link_speed = 10000,
>> +    .link_duplex = ETH_LINK_FULL_DUPLEX,
>> +    .link_status = 0
>> +};
>> +
>> +static uint16_t
>> +eth_null_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
>> +{
>> +    int i;
>> +    struct null_queue *h = q;
>> +    unsigned packet_size = h->internals->packet_size;
>> +
>> +    for (i = 0; i < nb_bufs; i++) {
>> +        bufs[i] = rte_pktmbuf_alloc(h->mb_pool);
>> +        if (!bufs[i])
>> +            break;
>> +        bufs[i]->data_len = (uint16_t)packet_size;
>> +        bufs[i]->pkt_len = packet_size;
>> +        bufs[i]->nb_segs = 1;
>> +        bufs[i]->next = NULL;
>> +    }
>> +
>> +    rte_atomic64_add(&(h->rx_pkts), i);
>> +
>> +    return i;
>> +}
>> +
>> +static uint16_t
>> +eth_null_copy_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
>> +{
>> +    int i;
>> +    struct null_queue *h = q;
>> +    unsigned packet_size = h->internals->packet_size;
>> +
>> +    for (i = 0; i < nb_bufs; i++) {
>> +        bufs[i] = rte_pktmbuf_alloc(h->mb_pool);
>> +        if (!bufs[i])
>> +            break;
>> +        rte_memcpy(rte_pktmbuf_mtod(bufs[i], void *), h->dummy_packet,
>> +                    packet_size);
>> +        bufs[i]->data_len = (uint16_t)packet_size;
>> +        bufs[i]->pkt_len = packet_size;
>> +        bufs[i]->nb_segs = 1;
>> +        bufs[i]->next = NULL;
>> +    }
>> +
>> +    rte_atomic64_add(&(h->rx_pkts), i);
>> +
>> +    return i;
>> +}
>> +
>> +static uint16_t
>> +eth_null_tx(void *q, struct rte_mbuf **bufs __rte_unused, uint16_t
>> nb_bufs)
>> +{
>> +    int i;
>> +    struct null_queue *h = q;
>> +
>> +    for (i = 0; i < nb_bufs; i++)
>> +        rte_pktmbuf_free(bufs[i]);
>> +
>> +    rte_atomic64_add(&(h->tx_pkts), i);
>> +
>> +    return i;
>> +}
>> +
>> +static uint16_t
>> +eth_null_copy_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
>> +{
>> +    int i;
>> +    struct null_queue *h = q;
>> +    unsigned packet_size = h->internals->packet_size;
>> +
>> +    for (i = 0; i < nb_bufs; i++) {
>> +        rte_memcpy(h->dummy_packet, rte_pktmbuf_mtod(bufs[i], void *),
>> +                    packet_size);
>> +        rte_pktmbuf_free(bufs[i]);
>> +    }
>> +
>> +    rte_atomic64_add(&(h->tx_pkts), i);
>> +
>> +    return i;
>> +}
>> +
>> +static int
>> +eth_dev_configure(struct rte_eth_dev *dev __rte_unused) { return 0; }
>> +
>> +static int
>> +eth_dev_start(struct rte_eth_dev *dev)
>> +{
>> +    dev->data->dev_link.link_status = 1;
>> +    return 0;
>> +}
>> +
>> +static void
>> +eth_dev_stop(struct rte_eth_dev *dev)
>> +{
>> +    dev->data->dev_link.link_status = 0;
>> +}
>> +
>> +static int
>> +eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
>> +        uint16_t nb_rx_desc __rte_unused,
>> +        unsigned int socket_id __rte_unused,
>> +        const struct rte_eth_rxconf *rx_conf __rte_unused,
>> +        struct rte_mempool *mb_pool __rte_unused)
>> +{
>> +    struct rte_mbuf *dummy_packet;
>> +    struct pmd_internals *internals = dev->data->dev_private;
>> +    unsigned packet_size = internals->packet_size;
>> +
>> +    if (rx_queue_id != 0)
>> +            return -ENODEV;
>> +
>> +    internals->rx_null_queues[rx_queue_id].mb_pool = mb_pool;
>> +    dev->data->rx_queues[rx_queue_id] =
>> +        &internals->rx_null_queues[rx_queue_id];
>> +    dummy_packet = rte_zmalloc_socket(NULL,
>> +            packet_size, 0, internals->numa_node);
>> +    if (dummy_packet == NULL)
>> +        return -ENOMEM;
>> +
>> +    internals->rx_null_queues[rx_queue_id].internals = internals;
>> +    internals->rx_null_queues[rx_queue_id].dummy_packet = dummy_packet;
>> +
>> +    return 0;
>> +}
>> +
>> +static int
>> +eth_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
>> +        uint16_t nb_tx_desc __rte_unused,
>> +        unsigned int socket_id __rte_unused,
>> +        const struct rte_eth_txconf *tx_conf __rte_unused)
>> +{
>> +    struct rte_mbuf *dummy_packet;
>> +    struct pmd_internals *internals = dev->data->dev_private;
>> +    unsigned packet_size = internals->packet_size;
>> +
>> +    if (tx_queue_id != 0)
>> +            return -ENODEV;
>> +
>> +    dev->data->tx_queues[tx_queue_id] =
>> +        &internals->tx_null_queues[tx_queue_id];
>> +    dummy_packet = rte_zmalloc_socket(NULL,
>> +            packet_size, 0, internals->numa_node);
>> +    if (dummy_packet == NULL)
>> +        return -ENOMEM;
>> +
>> +    internals->tx_null_queues[tx_queue_id].internals = internals;
>> +    internals->tx_null_queues[tx_queue_id].dummy_packet = dummy_packet;
>> +
>> +    return 0;
>> +}
>> +
>> +
>> +static void
>> +eth_dev_info(struct rte_eth_dev *dev,
>> +        struct rte_eth_dev_info *dev_info)
>> +{
>> +    struct pmd_internals *internals = dev->data->dev_private;
>> +
>> +    dev_info->driver_name = drivername;
>> +    dev_info->max_mac_addrs = 1;
>> +    dev_info->max_rx_pktlen = (uint32_t)-1;
>> +    dev_info->max_rx_queues = (uint16_t)internals->nb_rx_queues;
>> +    dev_info->max_tx_queues = (uint16_t)internals->nb_tx_queues;
>> +    dev_info->min_rx_bufsize = 0;
>> +    dev_info->pci_dev = NULL;
>> +}
>> +
>> +static void
>> +eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
>> +{
>> +    unsigned i;
>> +    unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
>> +    const struct pmd_internals *internal = dev->data->dev_private;
>> +
>> +    memset(igb_stats, 0, sizeof(*igb_stats));
>> +    for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
>> +            i < internal->nb_rx_queues; i++) {
>> +        igb_stats->q_ipackets[i] =
>> +            internal->rx_null_queues[i].rx_pkts.cnt;
>> +        rx_total += igb_stats->q_ipackets[i];
>> +    }
>> +
>> +    for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
>> +            i < internal->nb_tx_queues; i++) {
>> +        igb_stats->q_opackets[i] =
>> +            internal->tx_null_queues[i].tx_pkts.cnt;
>> +        igb_stats->q_errors[i] =
>> +            internal->tx_null_queues[i].err_pkts.cnt;
>> +        tx_total += igb_stats->q_opackets[i];
>> +        tx_err_total += igb_stats->q_errors[i];
>> +    }
>> +
>> +    igb_stats->ipackets = rx_total;
>> +    igb_stats->opackets = tx_total;
>> +    igb_stats->oerrors = tx_err_total;
>> +}
>> +
>> +static void
>> +eth_stats_reset(struct rte_eth_dev *dev)
>> +{
>> +    unsigned i;
>> +    struct pmd_internals *internal = dev->data->dev_private;
>> +
>> +    for (i = 0; i < internal->nb_rx_queues; i++)
>> +        internal->rx_null_queues[i].rx_pkts.cnt = 0;
>> +    for (i = 0; i < internal->nb_tx_queues; i++) {
>> +        internal->tx_null_queues[i].tx_pkts.cnt = 0;
>> +        internal->tx_null_queues[i].err_pkts.cnt = 0;
>> +    }
>> +}
>> +
>> +static void
>> +eth_queue_release(void *q __rte_unused) { ; }
>> +static int
>> +eth_link_update(struct rte_eth_dev *dev __rte_unused,
>> +        int wait_to_complete __rte_unused) { return 0; }
>> +
>> +static struct eth_dev_ops ops = {
>> +        .dev_start = eth_dev_start,
>> +        .dev_stop = eth_dev_stop,
>> +        .dev_configure = eth_dev_configure,
>> +        .dev_infos_get = eth_dev_info,
>> +        .rx_queue_setup = eth_rx_queue_setup,
>> +        .tx_queue_setup = eth_tx_queue_setup,
>> +        .rx_queue_release = eth_queue_release,
>> +        .tx_queue_release = eth_queue_release,
>> +        .link_update = eth_link_update,
>> +        .stats_get = eth_stats_get,
>> +        .stats_reset = eth_stats_reset,
>> +};
>> +
>> +static int
>> +eth_dev_null_create(const char *name __rte_unused,
>> +        const unsigned numa_node,
>> +        unsigned packet_size,
>> +        unsigned packet_copy)
>> +{
>> +    const unsigned nb_rx_queues = 1;
>> +    const unsigned nb_tx_queues = 1;
>> +    struct rte_eth_dev_data *data = NULL;
>> +    struct rte_pci_device *pci_dev = NULL;
>> +    struct pmd_internals *internals = NULL;
>> +    struct rte_eth_dev *eth_dev = NULL;
>> +
>> +    RTE_LOG(INFO, PMD, "Creating null ethdev on numa socket %u\n",
>> +            numa_node);
>> +
>> +    /* now do all data allocation - for eth_dev structure, dummy pci
>> driver
>> +     * and internal (private) data
>> +     */
>> +    data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
>> +    if (data == NULL)
>> +        goto error;
>> +
>> +    pci_dev = rte_zmalloc_socket(name, sizeof(*pci_dev), 0, numa_node);
>> +    if (pci_dev == NULL)
>> +        goto error;
>> +
>> +    internals = rte_zmalloc_socket(name, sizeof(*internals), 0,
>> numa_node);
>> +    if (internals == NULL)
>> +        goto error;
>> +
>> +    /* reserve an ethdev entry */
>> +    eth_dev = rte_eth_dev_allocate(name);
>> +    if (eth_dev == NULL)
>> +        goto error;
>> +
>> +    /* now put it all together
>> +     * - store queue data in internals,
>> +     * - store numa_node info in pci_driver
>> +     * - point eth_dev_data to internals and pci_driver
>> +     * - and point eth_dev structure to new eth_dev_data structure
>> +     */
>> +    /* NOTE: we'll replace the data element, of originally allocated
>> eth_dev
>> +     * so the nulls are local per-process */
>> +
>> +    internals->nb_rx_queues = nb_rx_queues;
>> +    internals->nb_tx_queues = nb_tx_queues;
>> +    internals->packet_size = packet_size;
>> +    internals->packet_copy = packet_copy;
>> +    internals->numa_node = numa_node;
>> +
>> +    pci_dev->numa_node = numa_node;
>> +
>> +    data->dev_private = internals;
>> +    data->port_id = eth_dev->data->port_id;
>> +    data->nb_rx_queues = (uint16_t)nb_rx_queues;
>> +    data->nb_tx_queues = (uint16_t)nb_tx_queues;
>> +    data->dev_link = pmd_link;
>> +    data->mac_addrs = &eth_addr;
>> +
>> +    eth_dev->data = data;
>> +    eth_dev->dev_ops = &ops;
>> +    eth_dev->pci_dev = pci_dev;
>> +
>> +    /* finally assign rx and tx ops */
>> +    if (packet_copy) {
>> +        eth_dev->rx_pkt_burst = eth_null_copy_rx;
>> +        eth_dev->tx_pkt_burst = eth_null_copy_tx;
>> +    } else {
>> +        eth_dev->rx_pkt_burst = eth_null_rx;
>> +        eth_dev->tx_pkt_burst = eth_null_tx;
>> +    }
>> +
>> +    return 0;
>> +
>> +error:
>> +    if (data)
>> +        rte_free(data);
>> +    if (pci_dev)
>> +        rte_free(pci_dev);
>> +    if (internals)
>> +        rte_free(internals);
>> +    return -1;
>> +}
>> +
>> +static inline int
>> +get_packet_size_arg(const char *key __rte_unused,
>> +        const char *value, void *extra_args)
>> +{
>> +    const char *a = value;
>> +    unsigned *packet_size = extra_args;
>> +
>> +    *packet_size = (unsigned)strtoul(a, NULL, 0);
>> +    if (*packet_size == UINT_MAX)
>> +        return -1;
>> +
>> +    return 0;
>> +}
>> +
>> +static inline int
>> +get_packet_copy_arg(const char *key __rte_unused,
>> +        const char *value, void *extra_args)
>> +{
>> +    const char *a = value;
>> +    unsigned *packet_copy = extra_args;
>> +
>> +    *packet_copy = (unsigned)strtoul(a, NULL, 0);
>> +    if (*packet_copy == UINT_MAX)
>> +        return -1;
>> +
>> +    return 0;
>> +}
>> +
>> +static int
>> +rte_pmd_null_devinit(const char *name, const char *params)
>> +{
>> +    unsigned numa_node;
>> +    unsigned packet_size = default_packet_size;
>> +    unsigned packet_copy = default_packet_copy;
>> +    struct rte_kvargs *kvlist;
>> +    int ret;
>> +
>> +    RTE_LOG(INFO, PMD, "Initializing pmd_null for %s\n", name);
>> +
>> +    numa_node = rte_socket_id();
>> +
>> +    kvlist = rte_kvargs_parse(params, valid_arguments);
>> +    if (kvlist == NULL)
>> +        return -1;
>> +
>> +    if (rte_kvargs_count(kvlist, ETH_NULL_PACKET_SIZE_ARG) == 1) {
>> +
>> +        ret = rte_kvargs_process(kvlist, ETH_NULL_PACKET_SIZE_ARG,
>> +                &get_packet_size_arg, &packet_size);
>> +        if (ret < 0)
>> +            return -1;
>> +    }
>> +
>> +    if (rte_kvargs_count(kvlist, ETH_NULL_PACKET_COPY_ARG) == 1) {
>> +
>> +        ret = rte_kvargs_process(kvlist, ETH_NULL_PACKET_COPY_ARG,
>> +                &get_packet_copy_arg, &packet_copy);
>> +        if (ret < 0)
>> +            return -1;
>> +    }
>> +
>> +    RTE_LOG(INFO, PMD, "Configure pmd_null: packet size is %d, "
>> +            "packet copy is %s\n", packet_size,
>> +            packet_copy ? "enabled" : "disabled");
>> +
>> +    return eth_dev_null_create(name, numa_node, packet_size,
>> packet_copy);
>> +}
>> +
>> +static struct rte_driver pmd_null_drv = {
>> +    .name = "eth_null",
>> +    .type = PMD_VDEV,
>> +    .init = rte_pmd_null_devinit,
>> +};
>> +
>> +PMD_REGISTER_DRIVER(pmd_null_drv);
>>
>
>