Re: [dpdk-dev] [RFC] librte_pmd_null: Add null PMD

[Ivan Boule <ivan.boule@6wind.com>]

On 09/19/2014 02:27 PM, mukawa@igel.co.jp wrote:
> From: Tetsuya Mukawa <mukawa@igel.co.jp>
>
> 'null PMD' is a virtual device driver particulary designed to measure
> performance of DPDK applications and DPDK PMDs. When an application call rx,
> null PMD just allocate mbufs and return those. Also tx, the PMD just free
> mbufs.
>
> The PMD has following options.
> - size: specify packe size allocated by RX. Default packet size is 64.
> - copy: specify 1 or 0 to enable or disable copy while RX and TX.
> 	Default value is 0(disbaled).
> 	This option is used for emulating more realistic data transfer.
> 	Copy size is equal to packet size.
Hi Tetsuya,

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".

Regards,
Ivan

>
> Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
> ---
>   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);
>


-- 
Ivan Boule
6WIND Development Engineer