[PATCH v4 2/2] examples: introduce new l2fwd-headroom example

[Pawel Wodkowski <pawelx.wodkowski-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

This app demonstrate usage of new headroom library.
It is basicaly orginal l2fwd with following modificantions to met
headroom library requirements:
- main_loop() was split into two jobs: forward job and flush job. Logic
for those jobs is almost the same as in orginal application.
- stats is moved to rte_alarm callbac to not introduce overhead of
printing.
- stats are expanded to show headroom statistics.
- added new parameter '-l' to automatic thousands separator.

Comparing orginal l2fwd and l2fwd-headroom apps will show approach what
is needed to properly write own application with headroom measurements.

New available statistics:
- Total and % of fwd and flush execution time
- management time - overhead of rte_timer + overhead of headroom library
- Idle time and % of time spent waiting for fwd or flush to be ready to
execute.
- per job execution time and period.


Signed-off-by: Pawel Wodkowski <pawelx.wodkowski-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 examples/Makefile                |    1 +
 examples/l2fwd-headroom/Makefile |   51 ++
 examples/l2fwd-headroom/main.c   | 1039 ++++++++++++++++++++++++++++++++++++++
 mk/rte.app.mk                    |    4 +
 4 files changed, 1095 insertions(+)
 create mode 100644 examples/l2fwd-headroom/Makefile
 create mode 100644 examples/l2fwd-headroom/main.c

diff --git a/examples/Makefile b/examples/Makefile
index 81f1d2f..8a459b7 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -50,6 +50,7 @@ DIRS-$(CONFIG_RTE_MBUF_REFCNT) += ip_fragmentation
 DIRS-$(CONFIG_RTE_MBUF_REFCNT) += ipv4_multicast
 DIRS-$(CONFIG_RTE_LIBRTE_KNI) += kni
 DIRS-y += l2fwd
+DIRS-y += l2fwd-headroom
 DIRS-$(CONFIG_RTE_LIBRTE_IVSHMEM) += l2fwd-ivshmem
 DIRS-y += l3fwd
 DIRS-$(CONFIG_RTE_LIBRTE_ACL) += l3fwd-acl
diff --git a/examples/l2fwd-headroom/Makefile b/examples/l2fwd-headroom/Makefile
new file mode 100644
index 0000000..07da286
--- /dev/null
+++ b/examples/l2fwd-headroom/Makefile
@@ -0,0 +1,51 @@
+#   BSD LICENSE
+#
+#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+#   All rights reserved.
+#
+#   Redistribution and use in source and binary forms, with or without
+#   modification, are permitted provided that the following conditions
+#   are met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the name of Intel Corporation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ifeq ($(RTE_SDK),)
+$(error "Please define RTE_SDK environment variable")
+endif
+
+# Default target, can be overriden by command line or environment
+RTE_TARGET ?= x86_64-native-linuxapp-gcc
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# binary name
+APP = l2fwd-headroom
+
+# all source are stored in SRCS-y
+SRCS-y := main.c
+
+
+CFLAGS += -O3
+CFLAGS += $(WERROR_FLAGS)
+
+include $(RTE_SDK)/mk/rte.extapp.mk
diff --git a/examples/l2fwd-headroom/main.c b/examples/l2fwd-headroom/main.c
new file mode 100644
index 0000000..7ba1743
--- /dev/null
+++ b/examples/l2fwd-headroom/main.c
@@ -0,0 +1,1039 @@
+/*-
+ *   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 <locale.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <ctype.h>
+#include <getopt.h>
+
+#include <rte_alarm.h>
+#include <rte_common.h>
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memcpy.h>
+#include <rte_memzone.h>
+#include <rte_tailq.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_launch.h>
+#include <rte_atomic.h>
+#include <rte_cycles.h>
+#include <rte_prefetch.h>
+#include <rte_lcore.h>
+#include <rte_per_lcore.h>
+#include <rte_branch_prediction.h>
+#include <rte_interrupts.h>
+#include <rte_pci.h>
+#include <rte_debug.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_ring.h>
+#include <rte_mempool.h>
+#include <rte_mbuf.h>
+#include <rte_spinlock.h>
+
+#include <rte_errno.h>
+#include <rte_headroom.h>
+#include <rte_timer.h>
+#include <rte_alarm.h>
+
+#define RTE_LOGTYPE_L2FWD RTE_LOGTYPE_USER1
+
+#define MBUF_SIZE (2048 + sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM)
+#define NB_MBUF   8192
+
+#define MAX_PKT_BURST 32
+#define BURST_TX_DRAIN_US 100 /* TX drain every ~100us */
+
+/*
+ * Configurable number of RX/TX ring descriptors
+ */
+#define RTE_TEST_RX_DESC_DEFAULT 128
+#define RTE_TEST_TX_DESC_DEFAULT 512
+static uint16_t nb_rxd = RTE_TEST_RX_DESC_DEFAULT;
+static uint16_t nb_txd = RTE_TEST_TX_DESC_DEFAULT;
+
+/* ethernet addresses of ports */
+static struct ether_addr l2fwd_ports_eth_addr[RTE_MAX_ETHPORTS];
+
+/* mask of enabled ports */
+static uint32_t l2fwd_enabled_port_mask;
+
+/* list of enabled ports */
+static uint32_t l2fwd_dst_ports[RTE_MAX_ETHPORTS];
+
+#define UPDATE_STEP_UP 1
+#define UPDATE_STEP_DOWN 32
+
+static unsigned int l2fwd_rx_queue_per_lcore = 1;
+
+struct mbuf_table {
+	uint64_t next_flush_time;
+	unsigned len;
+	struct rte_mbuf *mbufs[MAX_PKT_BURST];
+};
+
+#define MAX_RX_QUEUE_PER_LCORE 16
+#define MAX_TX_QUEUE_PER_PORT 16
+struct lcore_queue_conf {
+	unsigned n_rx_port;
+	unsigned rx_port_list[MAX_RX_QUEUE_PER_LCORE];
+	struct mbuf_table tx_mbufs[RTE_MAX_ETHPORTS];
+
+	struct rte_timer rx_timers[MAX_RX_QUEUE_PER_LCORE];
+	struct rte_headroom_job port_fwd_jobs[MAX_RX_QUEUE_PER_LCORE];
+
+	struct rte_timer flush_timer;
+	struct rte_headroom_job flush_job;
+	struct rte_headroom_job idle_job;
+	struct rte_headroom headroom;
+
+	rte_atomic16_t stats_read_pending;
+	rte_spinlock_t lock;
+} __rte_cache_aligned;
+struct lcore_queue_conf lcore_queue_conf[RTE_MAX_LCORE];
+
+static const struct rte_eth_conf port_conf = {
+	.rxmode = {
+		.split_hdr_size = 0,
+		.header_split   = 0, /**< Header Split disabled */
+		.hw_ip_checksum = 0, /**< IP checksum offload disabled */
+		.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,
+	},
+};
+
+struct rte_mempool *l2fwd_pktmbuf_pool = NULL;
+
+/* Per-port statistics struct */
+struct l2fwd_port_statistics {
+	uint64_t tx;
+	uint64_t rx;
+	uint64_t dropped;
+} __rte_cache_aligned;
+struct l2fwd_port_statistics port_statistics[RTE_MAX_ETHPORTS];
+
+/* 1 day max */
+#define MAX_TIMER_PERIOD 86400
+/* default period is 10 seconds */
+static int64_t timer_period = 10;
+/* default timer frequency */
+static double hz;
+/* BURST_TX_DRAIN_US converted to cycles */
+uint64_t drain_tsc;
+/* Convert cycles to ns */
+static inline double
+cycles_to_ns(uint64_t cycles)
+{
+	double t = cycles;
+
+	t *= (double)NS_PER_S;
+	t /= hz;
+	return t;
+}
+
+static void
+show_lcore_headroom_stats(unsigned lcore_id)
+{
+	struct lcore_queue_conf *qconf = &lcore_queue_conf[lcore_id];
+	struct rte_headroom *hdr = &qconf->headroom;
+	struct rte_headroom_job *job;
+	uint8_t i;
+
+	/* Headroom statistics. */
+	uint64_t stats_period, loop_count;
+	uint64_t exec, exec_min, exec_max;
+	uint64_t management, management_min, management_max;
+	uint64_t busy, busy_min, busy_max;
+
+	/* Jobs statistics. */
+	const uint8_t port_cnt = qconf->n_rx_port;
+	uint64_t jobs_exec_cnt[port_cnt], jobs_period[port_cnt];
+	uint64_t jobs_exec[port_cnt], jobs_exec_min[port_cnt],
+				jobs_exec_max[port_cnt];
+
+	uint64_t flush_exec_cnt, flush_period;
+	uint64_t flush_exec, flush_exec_min, flush_exec_max;
+
+	uint64_t idle_exec_cnt;
+	uint64_t idle_exec, idle_exec_min, idle_exec_max;
+	uint64_t collection_time = rte_get_timer_cycles();
+
+	/* Ask forwarding thread to give us stats. */
+	rte_atomic16_set(&qconf->stats_read_pending, 1);
+	rte_spinlock_lock(&qconf->lock);
+	rte_atomic16_set(&qconf->stats_read_pending, 0);
+
+	/* Collect headroom statistics. */
+	stats_period = hdr->state_time - hdr->start_time;
+	loop_count = hdr->loop_cnt;
+
+	exec = hdr->exec_time;
+	exec_min = hdr->min_exec_time;
+	exec_max = hdr->max_exec_time;
+
+	management = hdr->management_time;
+	management_min = hdr->min_management_time;
+	management_max = hdr->max_management_time;
+
+	rte_headroom_reset_stats(hdr);
+
+	for (i = 0; i < port_cnt; i++) {
+		job = &qconf->port_fwd_jobs[i];
+
+		jobs_exec_cnt[i] = job->exec_cnt;
+		jobs_period[i] = job->period;
+
+		jobs_exec[i] = job->exec_time;
+		jobs_exec_min[i] = job->min_exec_time;
+		jobs_exec_max[i] = job->max_exec_time;
+
+		rte_headroom_reset_job_stats(job);
+	}
+
+	flush_exec_cnt = qconf->flush_job.exec_cnt;
+	flush_period = qconf->flush_job.period;
+	flush_exec = qconf->flush_job.exec_time;
+	flush_exec_min = qconf->flush_job.min_exec_time;
+	flush_exec_max = qconf->flush_job.max_exec_time;
+	rte_headroom_reset_job_stats(&qconf->flush_job);
+
+	idle_exec_cnt = qconf->idle_job.exec_cnt;
+	idle_exec = qconf->idle_job.exec_time;
+	idle_exec_min = qconf->idle_job.min_exec_time;
+	idle_exec_max = qconf->idle_job.max_exec_time;
+	rte_headroom_reset_job_stats(&qconf->idle_job);
+
+	rte_spinlock_unlock(&qconf->lock);
+
+	exec -= idle_exec;
+	busy = exec + management;
+	busy_min = exec_min + management_min;
+	busy_max = exec_max + management_max;
+
+
+	collection_time = rte_get_timer_cycles() - collection_time;
+
+#define STAT_FMT "\n%-18s %'14.0f %6.1f%% %'10.0f %'10.0f %'10.0f"
+
+	printf("\n----------------"
+			"\nLCore %3u: headroom statistics (time in ns, collected in %'9.0f)"
+			"\n%-18s %14s %7s %10s %10s %10s "
+			"\n%-18s %'14.0f"
+			"\n%-18s %'14" PRIu64
+			STAT_FMT /* Exec */
+			STAT_FMT /* Management */
+			STAT_FMT /* Busy */
+			STAT_FMT, /* Idle  */
+			lcore_id, cycles_to_ns(collection_time),
+			"Stat type", "total", "%total", "avg", "min", "max",
+			"Stats duration:", cycles_to_ns(stats_period),
+			"Loop count:", loop_count,
+			"Exec time",
+			cycles_to_ns(exec), exec * 100.0 / stats_period ,
+			cycles_to_ns(loop_count  ? exec / loop_count : 0),
+			cycles_to_ns(exec_min),
+			cycles_to_ns(exec_max),
+			"Management time",
+			cycles_to_ns(management), management * 100.0 / stats_period,
+			cycles_to_ns(loop_count  ? management / loop_count : 0),
+			cycles_to_ns(management_min),
+			cycles_to_ns(management_max),
+			"Exec + management",
+			cycles_to_ns(busy),  busy * 100.0 / stats_period,
+			cycles_to_ns(loop_count ? busy / loop_count : 0),
+			cycles_to_ns(busy_min),
+			cycles_to_ns(busy_max),
+			"Idle (job)",
+			cycles_to_ns(idle_exec), idle_exec * 100.0 / stats_period,
+			cycles_to_ns(idle_exec_cnt ? idle_exec / idle_exec_cnt : 0),
+			cycles_to_ns(idle_exec_min),
+			cycles_to_ns(idle_exec_max));
+
+	for (i = 0; i < qconf->n_rx_port; i++) {
+		job = &qconf->port_fwd_jobs[i];
+		printf("\n\nJob %" PRIu32 ": %-20s "
+				"\n%-18s %'14" PRIu64
+				"\n%-18s %'14.0f"
+				STAT_FMT,
+				i, job->name,
+				"Exec count:", jobs_exec_cnt[i],
+				"Exec period: ", cycles_to_ns(jobs_period[i]),
+				"Exec time",
+				cycles_to_ns(jobs_exec[i]), jobs_exec[i] * 100.0 / stats_period,
+				cycles_to_ns(jobs_exec_cnt[i] ? jobs_exec[i] / jobs_exec_cnt[i]
+						: 0),
+				cycles_to_ns(jobs_exec_min[i]),
+				cycles_to_ns(jobs_exec_max[i]));
+	}
+
+	if (qconf->n_rx_port > 0) {
+		job = &qconf->flush_job;
+		printf("\n\nJob %" PRIu32 ": %-20s "
+				"\n%-18s %'14" PRIu64
+				"\n%-18s %'14.0f"
+				STAT_FMT,
+				i, job->name,
+				"Exec count:", flush_exec_cnt,
+				"Exec period: ", cycles_to_ns(flush_period),
+				"Exec time",
+				cycles_to_ns(flush_exec), flush_exec * 100.0 / stats_period ,
+				cycles_to_ns(flush_exec_cnt ? flush_exec / flush_exec_cnt : 0),
+				cycles_to_ns(flush_exec_min),
+				cycles_to_ns(flush_exec_max));
+	}
+}
+
+/* Print out statistics on packets dropped */
+static void
+show_stats_cb(__rte_unused void *param)
+{
+	uint64_t total_packets_dropped, total_packets_tx, total_packets_rx;
+	unsigned portid, lcore_id;
+
+	total_packets_dropped = 0;
+	total_packets_tx = 0;
+	total_packets_rx = 0;
+
+	const char clr[] = { 27, '[', '2', 'J', '\0' };
+	const char topLeft[] = { 27, '[', '1', ';', '1', 'H', '\0' };
+
+	/* Clear screen and move to top left */
+	printf("%s%s"
+			"\nPort statistics ===================================",
+			clr, topLeft);
+
+	for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++) {
+		/* skip disabled ports */
+		if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
+			continue;
+		printf("\nStatistics for port %u ------------------------------"
+				"\nPackets sent: %24"PRIu64
+				"\nPackets received: %20"PRIu64
+				"\nPackets dropped: %21"PRIu64,
+				portid,
+				port_statistics[portid].tx,
+				port_statistics[portid].rx,
+				port_statistics[portid].dropped);
+
+		total_packets_dropped += port_statistics[portid].dropped;
+		total_packets_tx += port_statistics[portid].tx;
+		total_packets_rx += port_statistics[portid].rx;
+	}
+
+	printf("\nAggregate statistics ==============================="
+			"\nTotal packets sent: %18"PRIu64
+			"\nTotal packets received: %14"PRIu64
+			"\nTotal packets dropped: %15"PRIu64
+			"\n====================================================",
+			total_packets_tx,
+			total_packets_rx,
+			total_packets_dropped);
+
+	RTE_LCORE_FOREACH(lcore_id) {
+		if (lcore_queue_conf[lcore_id].n_rx_port > 0)
+			show_lcore_headroom_stats(lcore_id);
+	}
+
+	printf("\n====================================================\n");
+	rte_eal_alarm_set(timer_period * US_PER_S, show_stats_cb, NULL);
+}
+
+/* Send the burst of packets on an output interface */
+static void
+l2fwd_send_burst(struct lcore_queue_conf *qconf, uint8_t port)
+{
+	struct mbuf_table *m_table;
+	uint16_t ret;
+	uint16_t queueid = 0;
+	uint16_t n;
+
+	m_table = &qconf->tx_mbufs[port];
+	n = m_table->len;
+
+	m_table->next_flush_time = rte_get_timer_cycles() + drain_tsc;
+	m_table->len = 0;
+
+	ret = rte_eth_tx_burst(port, queueid, m_table->mbufs, n);
+
+	port_statistics[port].tx += ret;
+	if (unlikely(ret < n)) {
+		port_statistics[port].dropped += (n - ret);
+		do {
+			rte_pktmbuf_free(m_table->mbufs[ret]);
+		} while (++ret < n);
+	}
+}
+
+/* Enqueue packets for TX and prepare them to be sent */
+static int
+l2fwd_send_packet(struct rte_mbuf *m, uint8_t port)
+{
+	const unsigned lcore_id = rte_lcore_id();
+	struct lcore_queue_conf *qconf = &lcore_queue_conf[lcore_id];
+	struct mbuf_table *m_table = &qconf->tx_mbufs[port];
+	uint16_t len = qconf->tx_mbufs[port].len;
+
+	m_table->mbufs[len] = m;
+
+	len++;
+	m_table->len = len;
+
+	/* Enough pkts to be sent. */
+	if (unlikely(len == MAX_PKT_BURST))
+		l2fwd_send_burst(qconf, port);
+
+	return 0;
+}
+
+static void
+l2fwd_simple_forward(struct rte_mbuf *m, unsigned portid)
+{
+	struct ether_hdr *eth;
+	void *tmp;
+	unsigned dst_port;
+
+	dst_port = l2fwd_dst_ports[portid];
+	eth = rte_pktmbuf_mtod(m, struct ether_hdr *);
+
+	/* 02:00:00:00:00:xx */
+	tmp = &eth->d_addr.addr_bytes[0];
+	*((uint64_t *)tmp) = 0x000000000002 + ((uint64_t)dst_port << 40);
+
+	/* src addr */
+	ether_addr_copy(&l2fwd_ports_eth_addr[dst_port], &eth->s_addr);
+
+	l2fwd_send_packet(m, (uint8_t) dst_port);
+}
+
+static void
+l2fwd_job_update_cb(struct rte_headroom_job *job, int64_t result)
+{
+	int64_t err = job->target - result;
+	int64_t histeresis = job->target / 8;
+
+	if (err < -histeresis) {
+		if (job->min_period + UPDATE_STEP_DOWN < job->period)
+			job->period -= UPDATE_STEP_DOWN;
+	} else if (err > histeresis) {
+		if (job->period + UPDATE_STEP_UP < job->max_period)
+			job->period += UPDATE_STEP_UP;
+	}
+}
+
+static void
+l2fwd_fwd_job(__rte_unused struct rte_timer *timer, void *arg)
+{
+	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
+	struct rte_mbuf *m;
+
+	const uint8_t port_idx = (uintptr_t) arg;
+	const unsigned lcore_id = rte_lcore_id();
+	struct lcore_queue_conf *qconf = &lcore_queue_conf[lcore_id];
+	struct rte_headroom_job *job = &qconf->port_fwd_jobs[port_idx];
+	const uint8_t portid = qconf->rx_port_list[port_idx];
+
+	uint8_t j;
+	uint16_t total_nb_rx;
+
+	rte_headroom_start_job(&qconf->headroom, job);
+
+	/* Call rx burst 2 times. This allow headroom logic to see if this function
+	 * must be called more frequently. */
+
+	total_nb_rx = rte_eth_rx_burst((uint8_t) portid, 0, pkts_burst,
+			MAX_PKT_BURST);
+
+	for (j = 0; j < total_nb_rx; j++) {
+		m = pkts_burst[j];
+		rte_prefetch0(rte_pktmbuf_mtod(m, void *));
+		l2fwd_simple_forward(m, portid);
+	}
+
+	if (total_nb_rx == MAX_PKT_BURST) {
+		const uint16_t nb_rx = rte_eth_rx_burst((uint8_t) portid, 0, pkts_burst,
+				MAX_PKT_BURST);
+
+		total_nb_rx += nb_rx;
+		for (j = 0; j < nb_rx; j++) {
+			m = pkts_burst[j];
+			rte_prefetch0(rte_pktmbuf_mtod(m, void *));
+			l2fwd_simple_forward(m, portid);
+		}
+	}
+
+	port_statistics[portid].rx += total_nb_rx;
+
+	/* Adjust period time in which we are running here. */
+	if (rte_headroom_finish_job(job, total_nb_rx) != 0) {
+		rte_timer_reset(&qconf->rx_timers[port_idx], job->period, PERIODICAL,
+				lcore_id, l2fwd_fwd_job, arg);
+	}
+}
+
+static void
+l2fwd_flush_job(__rte_unused struct rte_timer *timer, __rte_unused void *arg)
+{
+	uint64_t now;
+	unsigned lcore_id;
+	struct lcore_queue_conf *qconf;
+	struct mbuf_table *m_table;
+	uint8_t portid;
+
+	lcore_id = rte_lcore_id();
+	qconf = &lcore_queue_conf[lcore_id];
+
+	rte_headroom_start_job(&qconf->headroom, &qconf->flush_job);
+
+	now = rte_get_timer_cycles();
+	lcore_id = rte_lcore_id();
+	qconf = &lcore_queue_conf[lcore_id];
+	for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++) {
+		m_table = &qconf->tx_mbufs[portid];
+		if (m_table->len == 0 || m_table->next_flush_time <= now)
+			continue;
+
+		l2fwd_send_burst(qconf, portid);
+	}
+
+
+	/* Pass target to indicate that this job is happy of time interwal
+	 * in which it was called. */
+	rte_headroom_finish_job(&qconf->flush_job, qconf->flush_job.target);
+}
+
+/* main processing loop */
+static void
+l2fwd_main_loop(void)
+{
+	unsigned lcore_id;
+	unsigned i, portid;
+	struct lcore_queue_conf *qconf;
+	uint8_t stats_read_pending = 0;
+	uint8_t need_manage;
+
+	lcore_id = rte_lcore_id();
+	qconf = &lcore_queue_conf[lcore_id];
+
+	if (qconf->n_rx_port == 0) {
+		RTE_LOG(INFO, L2FWD, "lcore %u has nothing to do\n", lcore_id);
+		return;
+	}
+
+	RTE_LOG(INFO, L2FWD, "entering main loop on lcore %u\n", lcore_id);
+
+	for (i = 0; i < qconf->n_rx_port; i++) {
+
+		portid = qconf->rx_port_list[i];
+		RTE_LOG(INFO, L2FWD, " -- lcoreid=%u portid=%u\n", lcore_id,
+			portid);
+	}
+
+	rte_headroom_job_init(&qconf->idle_job, "idle", 0, 0, 0, 0);
+
+	for (;;) {
+		rte_spinlock_lock(&qconf->lock);
+
+		do {
+			rte_headroom_start_loop(&qconf->headroom);
+
+			/* Do the Idle job:
+			 * - Read stats_read_pending flag
+			 * - check if some real job need to be executed
+			 */
+			rte_headroom_start_job(&qconf->headroom, &qconf->idle_job);
+
+			do {
+				uint8_t i;
+				uint64_t now = rte_get_timer_cycles();
+				need_manage = qconf->flush_timer.expire < now;
+				/* Check if we was esked to give a stats. */
+				stats_read_pending =
+						rte_atomic16_read(&qconf->stats_read_pending);
+				need_manage |= stats_read_pending;
+
+				for (i = 0; i < qconf->n_rx_port && !need_manage; i++)
+					need_manage = qconf->rx_timers[i].expire < now;
+
+			} while (!need_manage);
+			rte_headroom_finish_job(&qconf->idle_job, qconf->idle_job.target);
+
+			rte_timer_manage();
+			rte_headroom_finish_loop(&qconf->headroom);
+		} while (likely(stats_read_pending == 0));
+
+		rte_spinlock_unlock(&qconf->lock);
+		rte_pause();
+	}
+}
+
+static int
+l2fwd_launch_one_lcore(__attribute__((unused)) void *dummy)
+{
+	l2fwd_main_loop();
+	return 0;
+}
+
+/* display usage */
+static void
+l2fwd_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 queue (=ports) per lcore (default is 1)\n"
+		   "  -T PERIOD: statistics will be refreshed each PERIOD seconds (0 to disable, 10 default, 86400 maximum)\n"
+		   "  -l set system default locale instead of default (\"C\" locale) for thousands separator in stats.",
+	       prgname);
+}
+
+static int
+l2fwd_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;
+}
+
+static unsigned int
+l2fwd_parse_nqueue(const char *q_arg)
+{
+	char *end = NULL;
+	unsigned long n;
+
+	/* parse hexadecimal string */
+	n = strtoul(q_arg, &end, 10);
+	if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0'))
+		return 0;
+	if (n == 0)
+		return 0;
+	if (n >= MAX_RX_QUEUE_PER_LCORE)
+		return 0;
+
+	return n;
+}
+
+static int
+l2fwd_parse_timer_period(const char *q_arg)
+{
+	char *end = NULL;
+	int n;
+
+	/* parse number string */
+	n = strtol(q_arg, &end, 10);
+	if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0'))
+		return -1;
+	if (n >= MAX_TIMER_PERIOD)
+		return -1;
+
+	return n;
+}
+
+/* Parse the argument given in the command line of the application */
+static int
+l2fwd_parse_args(int argc, char **argv)
+{
+	int opt, ret;
+	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:q:T:l",
+				  lgopts, &option_index)) != EOF) {
+
+		switch (opt) {
+		/* portmask */
+		case 'p':
+			l2fwd_enabled_port_mask = l2fwd_parse_portmask(optarg);
+			if (l2fwd_enabled_port_mask == 0) {
+				printf("invalid portmask\n");
+				l2fwd_usage(prgname);
+				return -1;
+			}
+			break;
+
+		/* nqueue */
+		case 'q':
+			l2fwd_rx_queue_per_lcore = l2fwd_parse_nqueue(optarg);
+			if (l2fwd_rx_queue_per_lcore == 0) {
+				printf("invalid queue number\n");
+				l2fwd_usage(prgname);
+				return -1;
+			}
+			break;
+
+		/* timer period */
+		case 'T':
+			timer_period = l2fwd_parse_timer_period(optarg);
+			if (timer_period < 0) {
+				printf("invalid timer period\n");
+				l2fwd_usage(prgname);
+				return -1;
+			}
+			break;
+
+		/* For thousands separator in printf. */
+		case 'l':
+			setlocale(LC_ALL, "");
+			break;
+
+		/* long options */
+		case 0:
+			l2fwd_usage(prgname);
+			return -1;
+
+		default:
+			l2fwd_usage(prgname);
+			return -1;
+		}
+	}
+
+	if (optind >= 0)
+		argv[optind-1] = prgname;
+
+	ret = optind-1;
+	optind = 0; /* reset getopt lib */
+	return ret;
+}
+
+/* Check the link status of all ports in up to 9s, and print them finally */
+static void
+check_all_ports_link_status(uint8_t port_num, uint32_t port_mask)
+{
+#define CHECK_INTERVAL 100 /* 100ms */
+#define MAX_CHECK_TIME 90 /* 9s (90 * 100ms) in total */
+	uint8_t portid, count, all_ports_up, print_flag = 0;
+	struct rte_eth_link link;
+
+	printf("\nChecking link status");
+	fflush(stdout);
+	for (count = 0; count <= MAX_CHECK_TIME; count++) {
+		all_ports_up = 1;
+		for (portid = 0; portid < port_num; portid++) {
+			if ((port_mask & (1 << portid)) == 0)
+				continue;
+			memset(&link, 0, sizeof(link));
+			rte_eth_link_get_nowait(portid, &link);
+			/* print link status if flag set */
+			if (print_flag == 1) {
+				if (link.link_status)
+					printf("Port %d Link Up - speed %u "
+						"Mbps - %s\n", (uint8_t)portid,
+						(unsigned)link.link_speed,
+				(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
+					("full-duplex") : ("half-duplex\n"));
+				else
+					printf("Port %d Link Down\n",
+						(uint8_t)portid);
+				continue;
+			}
+			/* clear all_ports_up flag if any link down */
+			if (link.link_status == 0) {
+				all_ports_up = 0;
+				break;
+			}
+		}
+		/* after finally printing all link status, get out */
+		if (print_flag == 1)
+			break;
+
+		if (all_ports_up == 0) {
+			printf(".");
+			fflush(stdout);
+			rte_delay_ms(CHECK_INTERVAL);
+		}
+
+		/* set the print_flag if all ports up or timeout */
+		if (all_ports_up == 1 || count == (MAX_CHECK_TIME - 1)) {
+			print_flag = 1;
+			printf("done\n");
+		}
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	struct lcore_queue_conf *qconf;
+	struct rte_eth_dev_info dev_info;
+	unsigned lcore_id, rx_lcore_id;
+	unsigned nb_ports_in_mask = 0;
+	int ret;
+	char name[RTE_HEADROOM_JOB_NAMESIZE];
+	uint8_t nb_ports;
+	uint8_t nb_ports_available;
+	uint8_t portid, last_port;
+	uint8_t i;
+
+	/* init EAL */
+	ret = rte_eal_init(argc, argv);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
+	argc -= ret;
+	argv += ret;
+
+	/* parse application arguments (after the EAL ones) */
+	ret = l2fwd_parse_args(argc, argv);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Invalid L2FWD arguments\n");
+
+	rte_timer_subsystem_init();
+
+	/* fetch default timer frequency. */
+	hz = rte_get_timer_hz();
+
+	/* create the mbuf pool */
+	l2fwd_pktmbuf_pool =
+		rte_mempool_create("mbuf_pool", NB_MBUF,
+				   MBUF_SIZE, 32,
+				   sizeof(struct rte_pktmbuf_pool_private),
+				   rte_pktmbuf_pool_init, NULL,
+				   rte_pktmbuf_init, NULL,
+				   rte_socket_id(), 0);
+	if (l2fwd_pktmbuf_pool == NULL)
+		rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
+
+	nb_ports = rte_eth_dev_count();
+	if (nb_ports == 0)
+		rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
+
+	if (nb_ports > RTE_MAX_ETHPORTS)
+		nb_ports = RTE_MAX_ETHPORTS;
+
+	/* reset l2fwd_dst_ports */
+	for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++)
+		l2fwd_dst_ports[portid] = 0;
+	last_port = 0;
+
+	/*
+	 * Each logical core is assigned a dedicated TX queue on each port.
+	 */
+	for (portid = 0; portid < nb_ports; portid++) {
+		/* skip ports that are not enabled */
+		if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
+			continue;
+
+		if (nb_ports_in_mask % 2) {
+			l2fwd_dst_ports[portid] = last_port;
+			l2fwd_dst_ports[last_port] = portid;
+		} else
+			last_port = portid;
+
+		nb_ports_in_mask++;
+
+		rte_eth_dev_info_get(portid, &dev_info);
+	}
+	if (nb_ports_in_mask % 2) {
+		printf("Notice: odd number of ports in portmask.\n");
+		l2fwd_dst_ports[last_port] = last_port;
+	}
+
+	rx_lcore_id = 0;
+	qconf = NULL;
+
+	/* Initialize the port/queue configuration of each logical core */
+	for (portid = 0; portid < nb_ports; portid++) {
+		/* skip ports that are not enabled */
+		if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
+			continue;
+
+		/* get the lcore_id for this port */
+		while (rte_lcore_is_enabled(rx_lcore_id) == 0 ||
+		       lcore_queue_conf[rx_lcore_id].n_rx_port ==
+		       l2fwd_rx_queue_per_lcore) {
+			rx_lcore_id++;
+			if (rx_lcore_id >= RTE_MAX_LCORE)
+				rte_exit(EXIT_FAILURE, "Not enough cores\n");
+		}
+
+		if (qconf != &lcore_queue_conf[rx_lcore_id])
+			/* Assigned a new logical core in the loop above. */
+			qconf = &lcore_queue_conf[rx_lcore_id];
+
+		qconf->rx_port_list[qconf->n_rx_port] = portid;
+		qconf->n_rx_port++;
+		printf("Lcore %u: RX port %u\n", rx_lcore_id, (unsigned) portid);
+	}
+
+	nb_ports_available = nb_ports;
+
+	/* Initialise each port */
+	for (portid = 0; portid < nb_ports; portid++) {
+		/* skip ports that are not enabled */
+		if ((l2fwd_enabled_port_mask & (1 << portid)) == 0) {
+			printf("Skipping disabled port %u\n", (unsigned) portid);
+			nb_ports_available--;
+			continue;
+		}
+		/* init port */
+		printf("Initializing port %u... ", (unsigned) portid);
+		fflush(stdout);
+		ret = rte_eth_dev_configure(portid, 1, 1, &port_conf);
+		if (ret < 0)
+			rte_exit(EXIT_FAILURE, "Cannot configure device: err=%d, port=%u\n",
+				  ret, (unsigned) portid);
+
+		rte_eth_macaddr_get(portid, &l2fwd_ports_eth_addr[portid]);
+
+		/* init one RX queue */
+		fflush(stdout);
+		ret = rte_eth_rx_queue_setup(portid, 0, nb_rxd,
+					     rte_eth_dev_socket_id(portid),
+					     NULL,
+					     l2fwd_pktmbuf_pool);
+		if (ret < 0)
+			rte_exit(EXIT_FAILURE, "rte_eth_rx_queue_setup:err=%d, port=%u\n",
+				  ret, (unsigned) portid);
+
+		/* init one TX queue on each port */
+		fflush(stdout);
+		ret = rte_eth_tx_queue_setup(portid, 0, nb_txd,
+				rte_eth_dev_socket_id(portid),
+				NULL);
+		if (ret < 0)
+			rte_exit(EXIT_FAILURE, "rte_eth_tx_queue_setup:err=%d, port=%u\n",
+				ret, (unsigned) 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, (unsigned) portid);
+
+		printf("done:\n");
+
+		rte_eth_promiscuous_enable(portid);
+
+		printf("Port %u, MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n\n",
+				(unsigned) portid,
+				l2fwd_ports_eth_addr[portid].addr_bytes[0],
+				l2fwd_ports_eth_addr[portid].addr_bytes[1],
+				l2fwd_ports_eth_addr[portid].addr_bytes[2],
+				l2fwd_ports_eth_addr[portid].addr_bytes[3],
+				l2fwd_ports_eth_addr[portid].addr_bytes[4],
+				l2fwd_ports_eth_addr[portid].addr_bytes[5]);
+
+		/* initialize port stats */
+		memset(&port_statistics, 0, sizeof(port_statistics));
+	}
+
+	if (!nb_ports_available) {
+		rte_exit(EXIT_FAILURE,
+			"All available ports are disabled. Please set portmask.\n");
+	}
+
+	check_all_ports_link_status(nb_ports, l2fwd_enabled_port_mask);
+
+	drain_tsc = (hz + US_PER_S - 1) / US_PER_S * BURST_TX_DRAIN_US;
+
+	RTE_LCORE_FOREACH(lcore_id) {
+		qconf = &lcore_queue_conf[lcore_id];
+
+		rte_spinlock_init(&qconf->lock);
+
+		if (rte_headroom_init(&qconf->headroom) != 0)
+			rte_panic("Headroom for core %u init failed\n", lcore_id);
+
+		if (qconf->n_rx_port == 0) {
+			RTE_LOG(INFO, L2FWD,
+				"lcore %u: no ports so no headroom initialization\n",
+				lcore_id);
+			continue;
+		}
+		/* Add flush job.
+		 * Set fixed period by setting min = max = initial period. Set target to
+		 * zero as it is irrelevant for this job. */
+		rte_headroom_job_init(&qconf->flush_job, "flush", drain_tsc, drain_tsc,
+				drain_tsc, 0);
+
+		rte_timer_init(&qconf->flush_timer);
+		rte_timer_reset(&qconf->flush_timer, drain_tsc, PERIODICAL, lcore_id,
+				&l2fwd_flush_job, NULL);
+
+		if (ret < 0) {
+			rte_exit(1, "Failed to add flush job for lcore %u: %s",
+					lcore_id, rte_strerror(-ret));
+		}
+
+		for (i = 0; i < qconf->n_rx_port; i++) {
+			struct rte_headroom_job *job = &qconf->port_fwd_jobs[i];
+
+			portid = qconf->rx_port_list[i];
+			printf("Setting forward jon for port %u\n", portid);
+
+			snprintf(name, RTE_DIM(name), "port %u fwd", portid);
+			/* Setup forward job.
+			 * Set min, max and initial period. Set target to MAX_PKT_BURST as
+			 * this is desired optimal RX/TX burst size. */
+			rte_headroom_job_init(job, name, 0, drain_tsc, 0, MAX_PKT_BURST);
+			rte_headroom_set_update_period_function(job, l2fwd_job_update_cb);
+
+			rte_timer_init(&qconf->rx_timers[i]);
+			rte_timer_reset(&qconf->rx_timers[i], 0, PERIODICAL, lcore_id,
+					&l2fwd_fwd_job, (void *)(uintptr_t)i);
+		}
+	}
+
+	if (timer_period)
+		rte_eal_alarm_set(timer_period * MS_PER_S, show_stats_cb, NULL);
+	else
+		RTE_LOG(INFO, L2FWD, "Stats display disabled\n");
+
+	/* launch per-lcore init on every lcore */
+	rte_eal_mp_remote_launch(l2fwd_launch_one_lcore, NULL, CALL_MASTER);
+	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
+		if (rte_eal_wait_lcore(lcore_id) < 0)
+			return -1;
+	}
+
+	return 0;
+}
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index 334cb25..3db7222 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -103,6 +103,10 @@ ifeq ($(CONFIG_RTE_LIBRTE_HASH),y)
 LDLIBS += -lrte_hash
 endif
 
+ifeq ($(CONFIG_RTE_LIBRTE_HEADROOM),y)
+LDLIBS += -lrte_headroom
+endif
+
 ifeq ($(CONFIG_RTE_LIBRTE_LPM),y)
 LDLIBS += -lrte_lpm
 endif
-- 
1.9.1