Re: [dpdk-dev] [PATCH v2] distributor_app: new sample app

["Pattan, Reshma" <reshma.pattan@intel.com>]

-----Original Message-----
From: Ananyev, Konstantin 
Sent: Friday, September 26, 2014 4:52 PM
To: De Lara Guarch, Pablo; Pattan, Reshma; dev@dpdk.org
Subject: RE: [dpdk-dev] [PATCH v2] distributor_app: new sample app



> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of De Lara Guarch, 
> Pablo
> Sent: Friday, September 26, 2014 4:12 PM
> To: Pattan, Reshma; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v2] distributor_app: new sample app
> 
> Hi,
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of reshmapa
> > Sent: Wednesday, September 24, 2014 3:17 PM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] [PATCH v2] distributor_app: new sample app
> >
> > From: Reshma Pattan <reshma.pattan@intel.com>
> >
> > A new sample app that shows the usage of the distributor library. 
> > This app works as follows:
> >
> > * An RX thread runs which pulls packets from each ethernet port in turn
> >   and passes those packets to worker using a distributor component.
> > * The workers take the packets in turn, and determine the output port
> >   for those packets using basic l2forwarding doing an xor on the source
> >   port id.
> > * The RX thread takes the returned packets from the workers and enqueue
> >   those packets into an rte_ring structure.
> > * A TX thread pulls the packets off the rte_ring structure and then
> >   sends each packet out the output port specified previously by the 
> > worker
> > * Command-line option support provided only for portmask.
> >
> > Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> > Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
> > ---
> >  examples/Makefile                 |   1 +
> >  examples/distributor_app/Makefile |  57 ++++
> >  examples/distributor_app/main.c   | 585
> > ++++++++++++++++++++++++++++++++++++++
> >  examples/distributor_app/main.h   |  46 +++
> >  4 files changed, 689 insertions(+)
> >  create mode 100644 examples/distributor_app/Makefile  create mode 
> > 100644 examples/distributor_app/main.c  create mode 100644 
> > examples/distributor_app/main.h
> >
> > diff --git a/examples/Makefile b/examples/Makefile index 
> > 6245f83..2ba82b0 100644
> > --- a/examples/Makefile
> > +++ b/examples/Makefile
> > @@ -66,5 +66,6 @@ DIRS-y += vhost
> >  DIRS-$(CONFIG_RTE_LIBRTE_XEN_DOM0) += vhost_xen  DIRS-y += vmdq  
> > DIRS-y += vmdq_dcb
> > +DIRS-$(CONFIG_RTE_LIBRTE_DISTRIBUTOR) += distributor_app
> >
> >  include $(RTE_SDK)/mk/rte.extsubdir.mk diff --git 
> > a/examples/distributor_app/Makefile
> > b/examples/distributor_app/Makefile
> > new file mode 100644
> > index 0000000..394785d
> > --- /dev/null
> > +++ b/examples/distributor_app/Makefile
> > @@ -0,0 +1,57 @@
> > +#   BSD LICENSE
> > +#
> > +#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
> > +#   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.
> > +
> > +ifeq ($(RTE_SDK),)
> > +$(error "Please define RTE_SDK environment variable") endif
> > +
> > +# Default target, can be overriden by command line or environment 
> > +RTE_TARGET ?= x86_64-default-linuxapp-gcc
> 
> This target is not present anymore. Change it to x86_64-native-linuxapp-gcc.
> 
> > +
> > +include $(RTE_SDK)/mk/rte.vars.mk
> > +
> > +# binary name
> > +APP = distributor_app
> > +
> > +# all source are stored in SRCS-y
> > +SRCS-y := main.c
> > +
> > +CFLAGS += $(WERROR_FLAGS)
> > +
> > +# workaround for a gcc bug with noreturn attribute # 
> > +http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12603
> > +ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y) CFLAGS_main.o += 
> > +-Wno-return-type endif
> > +
> > +EXTRA_CFLAGS += -O3 -Wfatal-errors
> > +
> > +include $(RTE_SDK)/mk/rte.extapp.mk
> > diff --git a/examples/distributor_app/main.c 
> > b/examples/distributor_app/main.c new file mode 100644 index 
> > 0000000..628810a
> > --- /dev/null
> > +++ b/examples/distributor_app/main.c
> > @@ -0,0 +1,585 @@
> > +/*-
> > + *   BSD LICENSE
> > + *
> > + *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
> > + *   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 <stdint.h>
> > +#include <inttypes.h>
> > +#include <unistd.h>
> > +#include <signal.h>
> > +#include <getopt.h>
> > +
> > +#include <rte_eal.h>
> > +#include <rte_ethdev.h>
> > +#include <rte_cycles.h>
> > +#include <rte_malloc.h>
> > +#include <rte_debug.h>
> > +#include <rte_distributor.h>
> > +
> > +#include "main.h"
> > +
> > +#define RX_RING_SIZE 256
> > +#define RX_FREE_THRESH 32
> > +#define RX_PTHRESH 8
> > +#define RX_HTHRESH 8
> > +#define RX_WTHRESH 0
> > +
> > +#define TX_RING_SIZE 512
> > +#define TX_FREE_THRESH 32
> > +#define TX_PTHRESH 32
> > +#define TX_HTHRESH 0
> > +#define TX_WTHRESH 0
> > +#define TX_RSBIT_THRESH 32
> > +#define TX_Q_FLAGS (ETH_TXQ_FLAGS_NOMULTSEGS |
> > ETH_TXQ_FLAGS_NOVLANOFFL |\
> > +	ETH_TXQ_FLAGS_NOXSUMSCTP | ETH_TXQ_FLAGS_NOXSUMUDP |
> > \
> > +	ETH_TXQ_FLAGS_NOXSUMTCP)
> > +
> > +#define NUM_MBUFS ((64*1024)-1)
> > +#define MBUF_SIZE (2048 + sizeof(struct rte_mbuf) +
> > RTE_PKTMBUF_HEADROOM)
> > +#define MBUF_CACHE_SIZE 250
> > +#define BURST_SIZE 32
> > +#define RTE_RING_SZ 1024
> > +
> > +/* mask of enabled ports */
> > +static uint32_t enabled_port_mask = 0;
> > +
> > +static volatile struct app_stats {
> > +	struct {
> > +		uint64_t rx_pkts;
> > +		uint64_t returned_pkts;
> > +		uint64_t enqueued_pkts;
> > +	} rx __rte_cache_aligned;
> > +
> > +	struct {
> > +		uint64_t dequeue_pkts;
> > +		uint64_t tx_pkts;
> > +	} tx __rte_cache_aligned;
> > +} app_stats;
> > +
> > +static const struct rte_eth_conf port_conf_default = {
> > +	.rxmode = {
> > +		.mq_mode = ETH_MQ_RX_RSS,
> > +		.max_rx_pkt_len = ETHER_MAX_LEN,
> > +		.split_hdr_size = 0,
> > +		.header_split   = 0, /**< Header Split disabled */
> > +		.hw_ip_checksum = 0, /**< IP checksum offload enabled */
> > +		.hw_vlan_filter = 0, /**< VLAN filtering disabled */
> > +		.jumbo_frame    = 0, /**< Jumbo Frame Support disabled */
> > +		.hw_strip_crc   = 0, /**< CRC stripped by hardware */
> > +	},
> > +	.txmode = {
> > +		.mq_mode = ETH_MQ_TX_NONE,
> > +	},
> > +	.lpbk_mode = 0,
> > +	.rx_adv_conf = {
> > +			.rss_conf = {
> > +				.rss_hf = ETH_RSS_IPV4 | ETH_RSS_IPV6 |
> > +					ETH_RSS_IPV4_TCP |
> > ETH_RSS_IPV4_UDP |
> > +					ETH_RSS_IPV6_TCP |
> > ETH_RSS_IPV6_UDP,
> > +			}
> > +	},
> > +};
> > +
> > +static const struct rte_eth_rxconf rx_conf_default = {
> > +	.rx_thresh = {
> > +		.pthresh = RX_PTHRESH,
> > +		.hthresh = RX_HTHRESH,
> > +		.wthresh = RX_WTHRESH,
> > +	},
> > +	.rx_free_thresh = RX_FREE_THRESH,
> > +	.rx_drop_en = 0,
> > +};
> > +
> > +static const struct rte_eth_txconf tx_conf_default = {
> > +	.tx_thresh = {
> > +		.pthresh = TX_PTHRESH,
> > +		.hthresh = TX_HTHRESH,
> > +		.wthresh = TX_WTHRESH,
> > +	},
> > +	.tx_free_thresh = TX_FREE_THRESH,
> > +	.tx_rs_thresh = TX_RSBIT_THRESH,
> > +	.txq_flags = TX_Q_FLAGS
> > +
> > +};
> > +
> > +struct output_buffer {
> > +	unsigned count;
> > +	struct rte_mbuf *mbufs[BURST_SIZE]; };
> > +
> > +/*
> > + * Initialises a given port using global settings and with the rx 
> > +buffers
> > + * coming from the mbuf_pool passed as parameter  */ static inline 
> > +int port_init(uint8_t port, struct rte_mempool *mbuf_pool) {
> > +	struct rte_eth_conf port_conf = port_conf_default;
> > +	const uint16_t rxRings = 1, txRings = rte_lcore_count() - 1;
> > +	int retval;
> > +	uint16_t q;
> > +
> > +	if (port >= rte_eth_dev_count())
> > +		return -1;
> > +
> > +	retval = rte_eth_dev_configure(port, rxRings, txRings, &port_conf);
> > +	if (retval != 0)
> > +		return retval;
> > +
> > +	for (q = 0; q < rxRings; q++) {
> > +		retval = rte_eth_rx_queue_setup(port, q, RX_RING_SIZE,
> > +
> > 	rte_eth_dev_socket_id(port),
> > +						&rx_conf_default,
> > mbuf_pool);
> > +		if (retval < 0)
> > +			return retval;
> > +	}
> > +
> > +	for (q = 0; q < txRings; q++) {
> > +		retval = rte_eth_tx_queue_setup(port, q, TX_RING_SIZE,
> > +
> > 	rte_eth_dev_socket_id(port),
> > +						&tx_conf_default);
> > +		if (retval < 0)
> > +			return retval;
> > +	}
> > +
> > +	retval  = rte_eth_dev_start(port);
> > +	if (retval < 0)
> > +		return retval;
> > +
> > +	struct rte_eth_link link;
> > +	rte_eth_link_get_nowait(port, &link);
> > +	if (!link.link_status) {
> > +		sleep(1);
> > +		rte_eth_link_get_nowait(port, &link);
> > +	}
> > +
> > +	if (!link.link_status) {
> > +		printf("Link down on port %"PRIu8"\n", port);
> > +		return 0;
> > +	}
> > +
> > +	struct ether_addr addr;
> > +	rte_eth_macaddr_get(port, &addr);
> > +	printf("Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
> > +			" %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
> > +			(unsigned)port,
> > +			addr.addr_bytes[0], addr.addr_bytes[1],
> > +			addr.addr_bytes[2], addr.addr_bytes[3],
> > +			addr.addr_bytes[4], addr.addr_bytes[5]);
> > +
> > +	rte_eth_promiscuous_enable(port);
> > +
> > +	return 0;
> > +}
> > +
> > +struct lcore_params {
> > +	unsigned worker_id;
> > +	struct rte_distributor *d;
> > +	struct rte_ring *r;
> > +};
> > +
> > +static __attribute__((noreturn)) void lcore_rx(struct lcore_params 
> > +*p) {
> > +	struct rte_distributor *d = p->d;
> > +	struct rte_ring *r = p->r;
> > +	const uint8_t nb_ports = rte_eth_dev_count();
> > +	const int socket_id = rte_socket_id();
> > +	uint8_t port;
> > +
> > +	for (port = 0; port < nb_ports; port++) {
> > +		/* skip ports that are not enabled */
> > +		if ((enabled_port_mask & (1 << port)) == 0)
> > +			continue;
> > +
> > +		if (rte_eth_dev_socket_id(port) > 0 &&
> > +				rte_eth_dev_socket_id(port) != socket_id)
> > +			printf("WARNING, port %u is on remote NUMA node
> > to "
> > +					"RX thread.\n\tPerformance will not
> > "
> > +					"be optimal.\n", port);
> > +	}
> > +
> > +	printf("\nCore %u doing packet RX.\n", rte_lcore_id());
> > +	port = 0;
> > +	for (;;) {
> > +		/* skip ports that are not enabled */
> > +		if ((enabled_port_mask & (1 << port)) == 0) {
> > +			if (++port == nb_ports)
> > +				port = 0;
> > +			continue;
> > +		}
> > +		struct rte_mbuf *bufs[BURST_SIZE*2];
> > +		const uint16_t nb_rx = rte_eth_rx_burst(port, 0, bufs,
> > +				BURST_SIZE);
> > +		app_stats.rx.rx_pkts += nb_rx;
> > +
> > +		rte_distributor_process(d, bufs, nb_rx);
> > +		const uint16_t nb_ret = rte_distributor_returned_pkts(d,
> > +				bufs, BURST_SIZE*2);
> > +		app_stats.rx.returned_pkts += nb_ret;
> > +		if (unlikely(nb_ret == 0))
> > +			continue;
> > +
> > +		uint16_t sent = rte_ring_enqueue_burst(r, (void *)bufs,
> > nb_ret);
> > +		app_stats.rx.enqueued_pkts += sent;
> > +		if (unlikely(sent < nb_ret)) {
> > +			printf("Packet loss due to full ring\n");
> 
> I would remove this printf. If core is too busy to process packets, this may make performance worse.
> Statistics should reflect this packet loss.

>Probably use RTE_LOG(DEBUG, ...).
>That's way you can switch it on/off at compile time.

By default  LOG_LEVEL is 8 in config/common_linuxapp, hence I see RTE_LOG(DEBUG,...) always works. 
So until unless change the LOG-LEVEL to lesser value, RTE_LOG(DEBUG,..) will be logged ..
Please let me know if I can go ahead and remove the printf as of now until the LOG_LEVEL is fixed. (or) I have to add some logic to log RTE_LOG(DEBUG,..)  only once.

> 
> > +			while (sent < nb_ret)
> > +				rte_pktmbuf_free(bufs[sent++]);
> > +		}
> > +		if (++port == nb_ports)
> > +			port = 0;
> > +	}
> > +}
> > +
> > +static inline void
> > +flush_one_port(struct output_buffer *outbuf, uint8_t outp) {
> > +	unsigned nb_tx = rte_eth_tx_burst(outp, 0, outbuf->mbufs,
> > +			outbuf->count);
> > +	app_stats.tx.tx_pkts += nb_tx;
> > +
> > +	if (unlikely(nb_tx < outbuf->count)) {
> > +		printf("Packet loss with tx_burst\n");
> 
> Same here. This is fine for debugging, but statistics are updated as well, so we do not need this printf.
> 
> > +		do {
> > +			rte_pktmbuf_free(outbuf->mbufs[nb_tx]);
> > +		} while (++nb_tx < outbuf->count);
> > +	}
> > +	outbuf->count = 0;
> > +}
> > +
> > +static inline void
> > +flush_all_ports(struct output_buffer *tx_buffers, uint8_t nb_ports) 
> > +{
> > +	uint8_t outp;
> > +	for (outp = 0; outp < nb_ports; outp++) {
> > +		/* skip ports that are not enabled */
> > +		if ((enabled_port_mask & (1 << outp)) == 0)
> > +			continue;
> > +
> > +		if (tx_buffers[outp].count == 0)
> > +			continue;
> > +
> > +		flush_one_port(&tx_buffers[outp], outp);
> > +	}
> > +}
> > +
> > +static __attribute__((noreturn)) void lcore_tx(struct rte_ring 
> > +*in_r) {
> > +	static struct output_buffer tx_buffers[RTE_MAX_ETHPORTS];
> > +	const uint8_t nb_ports = rte_eth_dev_count();
> > +	const int socket_id = rte_socket_id();
> > +	uint8_t port;
> > +
> > +	for (port = 0; port < nb_ports; port++) {
> > +		/* skip ports that are not enabled */
> > +		if ((enabled_port_mask & (1 << port)) == 0)
> > +			continue;
> > +
> > +		if (rte_eth_dev_socket_id(port) > 0 &&
> > +				rte_eth_dev_socket_id(port) != socket_id)
> > +			printf("WARNING, port %u is on remote NUMA node
> > to "
> > +					"TX thread.\n\tPerformance will not "
> > +					"be optimal.\n", port);
> > +	}
> > +
> > +	printf("\nCore %u doing packet TX.\n", rte_lcore_id());
> > +	for (;;) {
> > +		for (port = 0; port < nb_ports; port++) {
> > +			/* skip ports that are not enabled */
> > +			if ((enabled_port_mask & (1 << port)) == 0)
> > +				continue;
> > +
> > +			struct rte_mbuf *bufs[BURST_SIZE];
> > +			const uint16_t nb_rx = rte_ring_dequeue_burst(in_r,
> > +					(void *)bufs, BURST_SIZE);
> > +			app_stats.tx.dequeue_pkts += nb_rx;
> > +
> > +			/* if we get no traffic, flush anything we have */
> > +			if (unlikely(nb_rx == 0)) {
> > +				flush_all_ports(tx_buffers, nb_ports);
> > +				continue;
> > +			}
> > +
> > +			/* for traffic we receive, queue it up for transmit */
> > +			uint16_t i;
> > +			_mm_prefetch(bufs[0], 0);
> > +			_mm_prefetch(bufs[1], 0);
> > +			_mm_prefetch(bufs[2], 0);
> > +			for (i = 0; i < nb_rx; i++) {
> > +				struct output_buffer *outbuf;
> > +				uint8_t outp;
> > +				_mm_prefetch(bufs[i + 3], 0);
> > +				/* workers should update in_port to hold the
> > +				 * output port value */
> > +				outp = bufs[i]->port;
> > +				/* skip ports that are not enabled */
> > +				if ((enabled_port_mask & (1 << outp)) == 0)
> > +					continue;
> > +
> > +				outbuf = &tx_buffers[outp];
> > +				outbuf->mbufs[outbuf->count++] = bufs[i];
> > +				if (outbuf->count == BURST_SIZE)
> > +					flush_one_port(outbuf, outp);
> > +			}
> > +		}
> > +	}
> > +}
> > +
> > +
> > +static __attribute__((noreturn)) void lcore_worker(struct 
> > +lcore_params *p) {
> > +	struct rte_distributor *d = p->d;
> > +	const unsigned id = p->worker_id;
> > +	/* for single port, xor_val will be zero so we won't modify the output
> > +	 * port, otherwise we send traffic from 0 to 1, 2 to 3, and vice versa
> > +	 */
> > +	const unsigned xor_val = (rte_eth_dev_count() > 1);
> > +	struct rte_mbuf *buf = NULL;
> > +
> > +	printf("\nCore %u acting as worker core.\n", rte_lcore_id());
> > +	for (;;) {
> > +		buf = rte_distributor_get_pkt(d, id, buf);
> > +		buf->port ^= xor_val;
> > +	}
> > +}
> > +
> > +static void
> > +int_handler(int sig_num)
> > +{
> > +	struct rte_eth_stats eth_stats;
> > +	unsigned i;
> > +
> > +	printf("Exiting on signal %d\n", sig_num);
> > +
> > +	printf("\nRX thread stats:\n");
> > +	printf(" - Received:    %"PRIu64"\n", app_stats.rx.rx_pkts);
> > +	printf(" - Processed:   %"PRIu64"\n", app_stats.rx.returned_pkts);
> > +	printf(" - Enqueued:    %"PRIu64"\n", app_stats.rx.enqueued_pkts);
> > +
> > +	printf("\nTX thread stats:\n");
> > +	printf(" - Dequeued:    %"PRIu64"\n", app_stats.tx.dequeue_pkts);
> > +	printf(" - Transmitted: %"PRIu64"\n", app_stats.tx.tx_pkts);
> > +
> > +	for (i = 0; i < rte_eth_dev_count(); i++) {
> > +		rte_eth_stats_get(i, &eth_stats);
> > +		printf("\nPort %u stats:\n", i);
> > +		printf(" - Pkts in:   %"PRIu64"\n", eth_stats.ipackets);
> > +		printf(" - Pkts out:  %"PRIu64"\n", eth_stats.opackets);
> > +		printf(" - In Errs:   %"PRIu64"\n", eth_stats.ierrors);
> > +		printf(" - Out Errs:  %"PRIu64"\n", eth_stats.oerrors);
> > +		printf(" - Mbuf Errs: %"PRIu64"\n", eth_stats.rx_nombuf);
> > +	}
> > +	exit(0);
> > +}
> > +
> > +/* display usage */
> > +static void
> > +print_usage(const char *prgname)
> > +{
> > +	printf("%s [EAL options] -- -p PORTMASK\n"
> > +			"  -p PORTMASK: hexadecimal bitmask of ports to
> > configure\n",
> > +			prgname);
> > +}
> > +
> > +static int
> > +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;
> > +
> > +	if (pm == 0)
> > +		return -1;
> > +
> > +	return pm;
> > +}
> > +
> > +/* Parse the argument given in the command line of the application 
> > +*/ static int parse_args(int argc, char **argv) {
> > +	int opt;
> > +	char **argvopt;
> > +	int option_index;
> > +	char *prgname = argv[0];
> > +	static struct option lgopts[] = {
> > +		{NULL, 0, 0, 0}
> > +	};
> > +
> > +	argvopt = argv;
> > +
> > +	while ((opt = getopt_long(argc, argvopt, "p:",
> > +			lgopts, &option_index)) != EOF) {
> > +
> > +		switch (opt) {
> > +			/* portmask */
> > +			case 'p':
> > +				enabled_port_mask =
> > parse_portmask(optarg);
> > +				if (enabled_port_mask == 0) {
> > +					printf("invalid portmask\n");
> > +					print_usage(prgname);
> > +					return -1;
> > +				}
> > +				break;
> > +
> > +			default:
> > +				print_usage(prgname);
> > +				return -1;
> > +		}
> > +	}
> > +
> > +if (optind <= 1) {
> > +	print_usage(prgname);
> > +	return -1;
> > +}
> > +
> > +	argv[optind-1] = prgname;
> > +
> > +	optind = 0; /* reset getopt lib */
> > +	return 0;
> > +}
> > +
> > +/* Main function, does initialization and calls the per-lcore 
> > +functions */ int MAIN(int argc, char *argv[]) {
> > +	struct rte_mempool *mbuf_pool;
> > +	struct rte_distributor *d;
> > +	struct rte_ring *output_ring;
> > +	unsigned lcore_id, worker_id = 0;
> > +	unsigned nb_ports;
> > +	uint8_t portid;
> > +	uint8_t nb_ports_available;
> > +
> > +	/* catch ctrl-c so we can print on exit */
> > +	signal(SIGINT, int_handler);
> > +
> > +	/* init EAL */
> > +	int ret = rte_eal_init(argc, argv);
> > +	if (ret < 0)
> > +		rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
> > +	argc -= ret;
> > +	argv += ret;
> > +
> > +	/* parse application arguments (after the EAL ones) */
> > +	ret = parse_args(argc, argv);
> > +	if (ret < 0)
> > +		rte_exit(EXIT_FAILURE, "Invalid distributor parameters\n");
> > +
> > +	if (rte_lcore_count() < 3)
> > +		rte_exit(EXIT_FAILURE, "Error, This application needs at "
> > +				"least 3 logical cores to run:\n"
> > +				"1 lcore for packet RX and distribution\n"
> > +				"1 lcore for packet TX\n"
> > +				"and at least 1 lcore for worker threads\n");
> > +
> > +	if (rte_eal_pci_probe() != 0)
> > +		rte_exit(EXIT_FAILURE, "Error with PCI probing\n");
> > +
> > +	nb_ports = rte_eth_dev_count();
> > +	if (nb_ports == 0)
> > +		rte_exit(EXIT_FAILURE, "Error: no ethernet ports
> > detected\n");
> > +	if (nb_ports != 1 && (nb_ports & 1))
> > +		rte_exit(EXIT_FAILURE, "Error: number of ports must be
> > even, except "
> > +				"when using a single port\n");
> > +
> > +	mbuf_pool = rte_mempool_create("MBUF_POOL", NUM_MBUFS *
> > nb_ports,
> > +			MBUF_SIZE, MBUF_CACHE_SIZE,
> > +			sizeof(struct rte_pktmbuf_pool_private),
> > +			rte_pktmbuf_pool_init, NULL,
> > +			rte_pktmbuf_init, NULL,
> > +			rte_socket_id(), 0);
> > +	if (mbuf_pool == NULL)
> > +		rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
> > +
> > +	nb_ports_available = nb_ports;
> > +
> > +	/* initialize all ports */
> > +	for (portid = 0; portid < nb_ports; portid++) {
> > +		/* skip ports that are not enabled */
> > +		if ((enabled_port_mask & (1 << portid)) == 0) {
> > +			printf("\nSkipping disabled port %d\n", portid);
> > +			nb_ports_available--;
> > +			continue;
> > +		}
> > +		/* init port */
> > +		printf("Initializing port %u... done\n", (unsigned) portid);
> > +
> > +		if (port_init(portid, mbuf_pool) != 0)
> > +			rte_exit(EXIT_FAILURE, "Cannot initialize port
> > %"PRIu8"\n",
> > +					portid);
> > +	}
> > +
> > +	if (!nb_ports_available) {
> > +		rte_exit(EXIT_FAILURE,
> > +				"All available ports are disabled. Please set
> > portmask.\n");
> > +	}
> > +
> > +	d = rte_distributor_create("PKT_DIST", rte_socket_id(),
> > +			rte_lcore_count() - 2);
> > +	if (d == NULL)
> > +		rte_exit(EXIT_FAILURE, "Cannot create distributor\n");
> > +
> > +	/* scheduler ring is read only by the transmitter core, but written to
> > +	 * by multiple threads
> > +	 */
> > +	output_ring = rte_ring_create("Output_ring", RTE_RING_SZ,
> > +			rte_socket_id(), RING_F_SC_DEQ);
> > +	if (output_ring == NULL)
> > +		rte_exit(EXIT_FAILURE, "Cannot create output ring\n");
> > +
> > +	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
> > +		if (worker_id == rte_lcore_count() - 2)
> > +			rte_eal_remote_launch((lcore_function_t
> > *)lcore_tx,
> > +					output_ring, lcore_id);
> > +		else {
> > +			struct lcore_params *p =
> > +					rte_malloc(NULL, sizeof(*p), 0);
> > +			if (!p)
> > +				rte_panic("malloc failure\n");
> > +			*p = (struct lcore_params){worker_id, d,
> > output_ring};
> > +			rte_eal_remote_launch((lcore_function_t
> > *)lcore_worker,
> > +					p, lcore_id);
> > +		}
> > +		worker_id++;
> > +	}
> > +	/* call lcore_main on master core only */
> > +	struct lcore_params p = { 0, d, output_ring };
> > +	lcore_rx(&p);
> > +	return 0;
> > +}
> > diff --git a/examples/distributor_app/main.h 
> > b/examples/distributor_app/main.h new file mode 100644 index 
> > 0000000..2682d15
> > --- /dev/null
> > +++ b/examples/distributor_app/main.h
> > @@ -0,0 +1,46 @@
> > +/*-
> > + *   BSD LICENSE
> > + *
> > + *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
> > + *   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.
> > + */
> > +
> > +#ifndef _MAIN_H_
> > +#define _MAIN_H_
> > +
> > +
> > +#ifdef RTE_EXEC_ENV_BAREMETAL
> > +#define MAIN _main
> > +#else
> > +#define MAIN main
> > +#endif
> > +
> > +int MAIN(int argc, char *argv[]);
> > +
> > +#endif /* ifndef _MAIN_H_ */
> > --
> > 1.9.3

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