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

[Neil Horman <nhorman@tuxdriver.com>]

On Mon, Sep 29, 2014 at 01:35:21PM +0000, De Lara Guarch, Pablo wrote:
> 
> 
> > -----Original Message-----
> > From: Ananyev, Konstantin
> > Sent: Monday, September 29, 2014 2:07 PM
> > To: Pattan, Reshma; De Lara Guarch, Pablo; dev@dpdk.org
> > Subject: RE: [dpdk-dev] [PATCH v2] distributor_app: new sample app
> > 
> > 
> > 
> > > -----Original Message-----
> > > From: Pattan, Reshma
> > > Sent: Monday, September 29, 2014 1:40 PM
> > > To: Ananyev, Konstantin; De Lara Guarch, Pablo; dev@dpdk.org
> > > Subject: RE: [dpdk-dev] [PATCH v2] distributor_app: new sample app
> > >
> > >
> > >
> > > -----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.
> > 
> > Sorry, I probably wasn't clear enough.
> > What I am saying -  create something like that inside your app code:
> > 
> > #ifdef XXX_DEBUG
> > #define XXX_LOG(level, fmt, args...) \
> >         RTE_LOG(level, PMD, "%s(): " fmt "\n", __func__, ## args)
> > #else
> > #define XXX_LOG(level, fmt, args...) do { } while(0)
> > #endif
> > 
> > And replace your pritnf()s with it.
> 
> I think we should make some changes in some logs in DPDK, and change the default log level to be INFO or less, so we could use the DEBUG level for things like this, but anyway, that would be another patch that I am thinking to submit some other day.
> Anyway, for this one, this option could work, but still that message may be shown hundreds of thousands of times per second, considering that CPU is overloaded. So, should we include something like a flag here, so message is shown just once?
> I know that this will only be used when DEBUG is enabled, but still that could flood the screen, as it is in an infinite loop.
May you need a ratelimiting function?
Neil

> 
> > 
> > >
> > > >
> > > > > +			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;
> > > > > +}
> > > > > +
> 
>