From: Intel <intel.com>
Date: Mon, 3 Jun 2013 00:00:00 +0000 (+0000)
Subject: power: initial import
X-Git-Tag: spdx-start~11254
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=d7937e2e3d;p=dpdk.git

power: initial import

Signed-off-by: Intel
---

diff --git a/app/test/Makefile b/app/test/Makefile
index adc57ef4d1..d457ab45dd 100755
--- a/app/test/Makefile
+++ b/app/test/Makefile
@@ -87,6 +87,7 @@ SRCS-$(CONFIG_RTE_APP_TEST) += test_cmdline_string.c
 SRCS-$(CONFIG_RTE_APP_TEST) += test_cmdline_lib.c
 SRCS-$(CONFIG_RTE_APP_TEST) += test_pmac_pm.c
 SRCS-$(CONFIG_RTE_APP_TEST) += test_pmac_acl.c
+SRCS-$(CONFIG_RTE_APP_TEST) += test_power.c
 
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS)
diff --git a/app/test/autotest_data.py b/app/test/autotest_data.py
index ce2dc12e8d..f64ea9cec2 100755
--- a/app/test/autotest_data.py
+++ b/app/test/autotest_data.py
@@ -363,6 +363,19 @@ non_parallel_test_group_list = [
 		},
 	]
 },
+{
+	"Prefix" :      "power",
+	"Memory" :      all_sockets(512),
+	"Tests" :
+	[
+		{
+		 "Name" :       "Power autotest",
+		 "Command" :    "power_autotest",
+		 "Func" :       default_autotest,
+		 "Report" :     None,
+		},
+	]
+},
 {
 	"Prefix" :	"lpm6",
 	"Memory" :	"512",
diff --git a/app/test/commands.c b/app/test/commands.c
index 92bf88b9fb..ae94badafd 100755
--- a/app/test/commands.c
+++ b/app/test/commands.c
@@ -171,6 +171,8 @@ static void cmd_autotest_parsed(void *parsed_result,
 		ret |= test_pmac_pm();
 	if (all || !strcmp(res->autotest, "acl_autotest"))
 		ret |= test_pmac_acl();
+	if (all || !strcmp(res->autotest, "power_autotest"))
+		ret |= test_power();
 
 	if (ret == 0)
 		printf("Test OK\n");
@@ -200,7 +202,7 @@ cmdline_parse_token_string_t cmd_autotest_autotest =
 			"cmdline_autotest#func_reentrancy_autotest#"
 			"mempool_perf_autotest#hash_perf_autotest#"
 			"memcpy_perf_autotest#pm_autotest#"
-			"acl_autotest#"
+			"acl_autotest#power_autotest#"
 			"all_autotests");
 
 cmdline_parse_inst_t cmd_autotest = {
diff --git a/app/test/test.h b/app/test/test.h
index ab7a868978..632860bfcd 100755
--- a/app/test/test.h
+++ b/app/test/test.h
@@ -86,6 +86,7 @@ int test_cmdline(void);
 int test_func_reentrancy(void);
 int test_pmac_pm(void);
 int test_pmac_acl(void);
+int test_power(void);
 
 int test_pci_run;
 
diff --git a/app/test/test_power.c b/app/test/test_power.c
new file mode 100644
index 0000000000..1e6e0d5e09
--- /dev/null
+++ b/app/test/test_power.c
@@ -0,0 +1,487 @@
+/*-
+ *   BSD LICENSE
+ * 
+ *   Copyright(c) 2010-2013 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 <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <limits.h>
+#include <string.h>
+
+#include <cmdline_parse.h>
+
+#include "test.h"
+
+#ifdef RTE_LIBRTE_POWER
+
+#include <rte_power.h>
+
+#define TEST_POWER_LCORE_ID      2U
+#define TEST_POWER_LCORE_INVALID ((unsigned)RTE_MAX_LCORE)
+#define TEST_POWER_FREQS_NUM_MAX ((unsigned)RTE_MAX_LCORE_FREQS)
+
+#define TEST_POWER_SYSFILE_CUR_FREQ \
+	"/sys/devices/system/cpu/cpu%u/cpufreq/scaling_cur_freq"
+
+static uint32_t total_freq_num;
+static uint32_t freqs[TEST_POWER_FREQS_NUM_MAX];
+
+static int
+check_cur_freq(unsigned lcore_id, uint32_t idx)
+{
+#define TEST_POWER_CONVERT_TO_DECIMAL 10
+	FILE *f;
+	char fullpath[PATH_MAX];
+	char buf[BUFSIZ];
+	uint32_t cur_freq;
+	int ret = -1;
+
+	if (rte_snprintf(fullpath, sizeof(fullpath),
+		TEST_POWER_SYSFILE_CUR_FREQ, lcore_id) < 0) {
+		return 0;
+	}
+	f = fopen(fullpath, "r");
+	if (f == NULL) {
+		return 0;
+	}
+	if (fgets(buf, sizeof(buf), f) == NULL) {
+		goto fail_get_cur_freq;
+	}
+	cur_freq = strtoul(buf, NULL, TEST_POWER_CONVERT_TO_DECIMAL);
+	ret = (freqs[idx] == cur_freq ? 0 : -1);
+
+fail_get_cur_freq:
+	fclose(f);
+
+	return ret;
+}
+
+/* Check rte_power_freqs() */
+static int
+check_power_freqs(void)
+{
+	uint32_t ret;
+
+	total_freq_num = 0;
+	memset(freqs, 0, sizeof(freqs));
+
+	/* test with an invalid lcore id */
+	ret = rte_power_freqs(TEST_POWER_LCORE_INVALID, freqs,
+					TEST_POWER_FREQS_NUM_MAX);
+	if (ret > 0) {
+		printf("Unexpectedly get available freqs successfully on "
+				"lcore %u\n", TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+
+	/* test with NULL buffer to save available freqs */
+	ret = rte_power_freqs(TEST_POWER_LCORE_ID, NULL,
+				TEST_POWER_FREQS_NUM_MAX);
+	if (ret > 0) {
+		printf("Unexpectedly get available freqs successfully with "
+			"NULL buffer on lcore %u\n", TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* test of getting zero number of freqs */
+	ret = rte_power_freqs(TEST_POWER_LCORE_ID, freqs, 0);
+	if (ret > 0) {
+		printf("Unexpectedly get available freqs successfully with "
+			"zero buffer size on lcore %u\n", TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* test with all valid input parameters */
+	ret = rte_power_freqs(TEST_POWER_LCORE_ID, freqs,
+				TEST_POWER_FREQS_NUM_MAX);
+	if (ret == 0 || ret > TEST_POWER_FREQS_NUM_MAX) {
+		printf("Fail to get available freqs on lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Save the total number of available freqs */
+	total_freq_num = ret;
+
+	return 0;
+}
+
+/* Check rte_power_get_freq() */
+static int
+check_power_get_freq(void)
+{
+	int ret;
+	uint32_t count;
+
+	/* test with an invalid lcore id */
+	count = rte_power_get_freq(TEST_POWER_LCORE_INVALID);
+	if (count < TEST_POWER_FREQS_NUM_MAX) {
+		printf("Unexpectedly get freq index successfully on "
+				"lcore %u\n", TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+
+	count = rte_power_get_freq(TEST_POWER_LCORE_ID);
+	if (count >= TEST_POWER_FREQS_NUM_MAX) {
+		printf("Fail to get the freq index on lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Check the current frequency */
+	ret = check_cur_freq(TEST_POWER_LCORE_ID, count);
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+/* Check rte_power_set_freq() */
+static int
+check_power_set_freq(void)
+{
+	int ret;
+
+	/* test with an invalid lcore id */
+	ret = rte_power_set_freq(TEST_POWER_LCORE_INVALID, 0);
+	if (ret >= 0) {
+		printf("Unexpectedly set freq index successfully on "
+				"lcore %u\n", TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+
+	/* test with an invalid freq index */
+	ret = rte_power_set_freq(TEST_POWER_LCORE_ID,
+				TEST_POWER_FREQS_NUM_MAX);
+	if (ret >= 0) {
+		printf("Unexpectedly set an invalid freq index (%u)"
+			"successfully on lcore %u\n", TEST_POWER_FREQS_NUM_MAX,
+							TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/**
+	 * test with an invalid freq index which is right one bigger than
+	 * total number of freqs
+	 */
+	ret = rte_power_set_freq(TEST_POWER_LCORE_ID, total_freq_num);
+	if (ret >= 0) {
+		printf("Unexpectedly set an invalid freq index (%u)"
+			"successfully on lcore %u\n", total_freq_num,
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+	ret = rte_power_set_freq(TEST_POWER_LCORE_ID, 3);
+	if (ret < 0) {
+		printf("Fail to set freq index on lcore %u\n",
+					TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Check the current frequency */
+	ret = check_cur_freq(TEST_POWER_LCORE_ID, 3);
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+/* Check rte_power_freq_down() */
+static int
+check_power_freq_down(void)
+{
+	int ret;
+
+	/* test with an invalid lcore id */
+	ret = rte_power_freq_down(TEST_POWER_LCORE_INVALID);
+	if (ret >= 0) {
+		printf("Unexpectedly scale down successfully the freq on "
+				"lcore %u\n", TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+
+	/* Scale down to min and then scale down one step */
+	ret = rte_power_freq_min(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale down the freq to min on lcore %u\n",
+							TEST_POWER_LCORE_ID);
+		return -1;
+	}
+	ret = rte_power_freq_down(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale down the freq on lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Check the current frequency */
+	ret = check_cur_freq(TEST_POWER_LCORE_ID, total_freq_num - 1);
+	if (ret < 0)
+		return -1;
+
+	/* Scale up to max and then scale down one step */
+	ret = rte_power_freq_max(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale up the freq to max on lcore %u\n",
+							TEST_POWER_LCORE_ID);
+		return -1;
+	}
+	ret = rte_power_freq_down(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf ("Fail to scale down the freq on lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Check the current frequency */
+	ret = check_cur_freq(TEST_POWER_LCORE_ID, 1);
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+/* Check rte_power_freq_up() */
+static int
+check_power_freq_up(void)
+{
+	int ret;
+
+	/* test with an invalid lcore id */
+	ret = rte_power_freq_up(TEST_POWER_LCORE_INVALID);
+	if (ret >= 0) {
+		printf("Unexpectedly scale up successfully the freq on %u\n",
+						TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+
+	/* Scale down to min and then scale up one step */
+	ret = rte_power_freq_min(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale down the freq to min on lcore %u\n",
+							TEST_POWER_LCORE_ID);
+		return -1;
+	}
+	ret = rte_power_freq_up(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale up the freq on lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Check the current frequency */
+	ret = check_cur_freq(TEST_POWER_LCORE_ID, total_freq_num - 2);
+	if (ret < 0)
+		return -1;
+
+	/* Scale up to max and then scale up one step */
+	ret = rte_power_freq_max(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale up the freq to max on lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+	ret = rte_power_freq_up(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale up the freq on lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Check the current frequency */
+	ret = check_cur_freq(TEST_POWER_LCORE_ID, 0);
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+/* Check rte_power_freq_max() */
+static int
+check_power_freq_max(void)
+{
+	int ret;
+
+	/* test with an invalid lcore id */
+	ret = rte_power_freq_max(TEST_POWER_LCORE_INVALID);
+	if (ret >= 0) {
+		printf("Unexpectedly scale up successfully the freq to max on "
+				"lcore %u\n", TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+	ret = rte_power_freq_max(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale up the freq to max on lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Check the current frequency */
+	ret = check_cur_freq(TEST_POWER_LCORE_ID, 0);
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+/* Check rte_power_freq_min() */
+static int
+check_power_freq_min(void)
+{
+	int ret;
+
+	/* test with an invalid lcore id */
+	ret = rte_power_freq_min(TEST_POWER_LCORE_INVALID);
+	if (ret >= 0) {
+		printf("Unexpectedly scale down successfully the freq to min "
+				"on lcore %u\n", TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+	ret = rte_power_freq_min(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Fail to scale down the freq to min on lcore %u\n",
+							TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* Check the current frequency */
+	ret = check_cur_freq(TEST_POWER_LCORE_ID, total_freq_num - 1);
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+int
+test_power(void)
+{
+	int ret = -1;
+
+	/* test of init power management for an invalid lcore */
+	ret = rte_power_init(TEST_POWER_LCORE_INVALID);
+	if (ret == 0) {
+		printf("Unexpectedly initialise power management successfully "
+				"for lcore %u\n", TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+
+	ret = rte_power_init(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Cannot initialise power management for lcore %u\n",
+							TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/**
+	 * test of initialising power management for the lcore which has
+	 * been initialised
+	 */
+	ret = rte_power_init(TEST_POWER_LCORE_ID);
+	if (ret == 0) {
+		printf("Unexpectedly init successfully power twice on "
+					"lcore %u\n", TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	ret = check_power_freqs();
+	if (ret < 0)
+		goto fail_all;
+
+	ret = check_power_get_freq();
+	if (ret < 0)
+		goto fail_all;
+
+	ret = check_power_set_freq();
+	if (ret < 0)
+		goto fail_all;
+
+	ret = check_power_freq_down();
+	if (ret < 0)
+		goto fail_all;
+
+	ret = check_power_freq_up();
+	if (ret < 0)
+		goto fail_all;
+
+	ret = check_power_freq_max();
+	if (ret < 0)
+		goto fail_all;
+
+	ret = check_power_freq_min();
+	if (ret < 0)
+		goto fail_all;
+
+	ret = rte_power_exit(TEST_POWER_LCORE_ID);
+	if (ret < 0) {
+		printf("Cannot exit power management for lcore %u\n",
+						TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/**
+	 * test of exiting power management for the lcore which has been exited
+	 */
+	ret = rte_power_exit(TEST_POWER_LCORE_ID);
+	if (ret == 0) {
+		printf("Unexpectedly exit successfully power management twice "
+					"on lcore %u\n", TEST_POWER_LCORE_ID);
+		return -1;
+	}
+
+	/* test of exit power management for an invalid lcore */
+	ret = rte_power_exit(TEST_POWER_LCORE_INVALID);
+	if (ret == 0) {
+		printf("Unpectedly exit power management successfully for "
+				"lcore %u\n", TEST_POWER_LCORE_INVALID);
+		return -1;
+	}
+
+	return 0;
+
+fail_all:
+	rte_power_exit(TEST_POWER_LCORE_ID);
+
+	return -1;
+}
+
+#else /* RTE_LIBRTE_POWER */
+
+int
+test_power(void)
+{
+	printf("The power library is not included in this build\n");
+	return 0;
+}
+
+#endif /* RTE_LIBRTE_POWER */
+
diff --git a/config/defconfig_i686-default-linuxapp-gcc b/config/defconfig_i686-default-linuxapp-gcc
index 57d768f838..686f1d15cb 100644
--- a/config/defconfig_i686-default-linuxapp-gcc
+++ b/config/defconfig_i686-default-linuxapp-gcc
@@ -216,6 +216,13 @@ CONFIG_RTE_LIBRTE_HASH_DEBUG=n
 CONFIG_RTE_LIBRTE_LPM=y
 CONFIG_RTE_LIBRTE_LPM_DEBUG=n
 
+#
+# Compile librte_power
+#
+CONFIG_RTE_LIBRTE_POWER=y
+CONFIG_RTE_LIBRTE_POWER_DEBUG=n
+CONFIG_RTE_MAX_LCORE_FREQS=64
+
 #
 # Compile librte_net
 #
diff --git a/config/defconfig_i686-default-linuxapp-icc b/config/defconfig_i686-default-linuxapp-icc
index 44f1b054e3..5247d5b147 100644
--- a/config/defconfig_i686-default-linuxapp-icc
+++ b/config/defconfig_i686-default-linuxapp-icc
@@ -217,6 +217,13 @@ CONFIG_RTE_LIBRTE_HASH_DEBUG=n
 CONFIG_RTE_LIBRTE_LPM=y
 CONFIG_RTE_LIBRTE_LPM_DEBUG=n
 
+#
+# Compile librte_power
+#
+CONFIG_RTE_LIBRTE_POWER=y
+CONFIG_RTE_LIBRTE_POWER_DEBUG=n
+CONFIG_RTE_MAX_LCORE_FREQS=64
+
 #
 # Compile librte_net
 #
diff --git a/config/defconfig_x86_64-default-linuxapp-gcc b/config/defconfig_x86_64-default-linuxapp-gcc
index 8e76034642..dbb1068013 100644
--- a/config/defconfig_x86_64-default-linuxapp-gcc
+++ b/config/defconfig_x86_64-default-linuxapp-gcc
@@ -217,6 +217,13 @@ CONFIG_RTE_LIBRTE_HASH_DEBUG=n
 CONFIG_RTE_LIBRTE_LPM=y
 CONFIG_RTE_LIBRTE_LPM_DEBUG=n
 
+#
+# Compile librte_power
+#
+CONFIG_RTE_LIBRTE_POWER=y
+CONFIG_RTE_LIBRTE_POWER_DEBUG=n
+CONFIG_RTE_MAX_LCORE_FREQS=64
+
 #
 # Compile librte_net
 #
diff --git a/config/defconfig_x86_64-default-linuxapp-icc b/config/defconfig_x86_64-default-linuxapp-icc
index edcacf3579..68dd9c3798 100644
--- a/config/defconfig_x86_64-default-linuxapp-icc
+++ b/config/defconfig_x86_64-default-linuxapp-icc
@@ -217,6 +217,13 @@ CONFIG_RTE_LIBRTE_HASH_DEBUG=n
 CONFIG_RTE_LIBRTE_LPM=y
 CONFIG_RTE_LIBRTE_LPM_DEBUG=n
 
+#
+# Compile librte_power
+#
+CONFIG_RTE_LIBRTE_POWER=y
+CONFIG_RTE_LIBRTE_POWER_DEBUG=n
+CONFIG_RTE_MAX_LCORE_FREQS=64
+
 #
 # Compile librte_net
 #
diff --git a/examples/l3fwd-power/Makefile b/examples/l3fwd-power/Makefile
new file mode 100644
index 0000000000..80a0993279
--- /dev/null
+++ b/examples/l3fwd-power/Makefile
@@ -0,0 +1,57 @@
+#   BSD LICENSE
+# 
+#   Copyright(c) 2010-2013 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
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# binary name
+APP = l3fwd-power
+
+# all source are stored in SRCS-y
+SRCS-y := main.c
+
+CFLAGS += -O3
+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
+
+include $(RTE_SDK)/mk/rte.extapp.mk
diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
new file mode 100644
index 0000000000..d0b52890cc
--- /dev/null
+++ b/examples/l3fwd-power/main.c
@@ -0,0 +1,1714 @@
+/*-
+ *   BSD LICENSE
+ * 
+ *   Copyright(c) 2010-2013 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 <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <sys/types.h>
+#include <string.h>
+#include <sys/queue.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <rte_common.h>
+#include <rte_byteorder.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_random.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_ip.h>
+#include <rte_tcp.h>
+#include <rte_udp.h>
+#include <rte_string_fns.h>
+#include <rte_timer.h>
+#include <rte_power.h>
+
+#include "main.h"
+
+#define RTE_LOGTYPE_L3FWD_POWER RTE_LOGTYPE_USER1
+
+#define MAX_PKT_BURST 32
+
+#define MIN_ZERO_POLL_COUNT 5
+
+/* around 100ms at 2 Ghz */
+#define TIMER_RESOLUTION_CYCLES           200000000ULL
+/* 100 ms interval */
+#define TIMER_NUMBER_PER_SECOND           10
+/* 100000 us */
+#define SCALING_PERIOD                    (1000000/TIMER_NUMBER_PER_SECOND)
+#define SCALING_DOWN_TIME_RATIO_THRESHOLD 0.25
+
+#define APP_LOOKUP_EXACT_MATCH          0
+#define APP_LOOKUP_LPM                  1
+#define DO_RFC_1812_CHECKS
+
+#ifndef APP_LOOKUP_METHOD
+#define APP_LOOKUP_METHOD             APP_LOOKUP_LPM
+#endif
+
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_EXACT_MATCH)
+#include <rte_hash.h>
+#elif (APP_LOOKUP_METHOD == APP_LOOKUP_LPM)
+#include <rte_lpm.h>
+#else
+#error "APP_LOOKUP_METHOD set to incorrect value"
+#endif
+
+#ifndef IPv6_BYTES
+#define IPv6_BYTES_FMT "%02x%02x:%02x%02x:%02x%02x:%02x%02x:"\
+                       "%02x%02x:%02x%02x:%02x%02x:%02x%02x"
+#define IPv6_BYTES(addr) \
+	addr[0],  addr[1], addr[2],  addr[3], \
+	addr[4],  addr[5], addr[6],  addr[7], \
+	addr[8],  addr[9], addr[10], addr[11],\
+	addr[12], addr[13],addr[14], addr[15]
+#endif
+
+#define MAX_JUMBO_PKT_LEN  9600
+
+#define IPV6_ADDR_LEN 16
+
+#define MEMPOOL_CACHE_SIZE 256
+
+#define MBUF_SIZE (2048 + sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM)
+
+/*
+ * This expression is used to calculate the number of mbufs needed depending on
+ * user input, taking into account memory for rx and tx hardware rings, cache
+ * per lcore and mtable per port per lcore. RTE_MAX is used to ensure that
+ * NB_MBUF never goes below a minimum value of 8192.
+ */
+
+#define NB_MBUF RTE_MAX	( \
+	(nb_ports*nb_rx_queue*RTE_TEST_RX_DESC_DEFAULT + \
+	nb_ports*nb_lcores*MAX_PKT_BURST + \
+	nb_ports*n_tx_queue*RTE_TEST_TX_DESC_DEFAULT + \
+	nb_lcores*MEMPOOL_CACHE_SIZE), \
+	(unsigned)8192)
+
+/*
+ * RX and TX Prefetch, Host, and Write-back threshold values should be
+ * carefully set for optimal performance. Consult the network
+ * controller's datasheet and supporting DPDK documentation for guidance
+ * on how these parameters should be set.
+ */
+#define RX_PTHRESH 8 /**< Default values of RX prefetch threshold reg. */
+#define RX_HTHRESH 8 /**< Default values of RX host threshold reg. */
+#define RX_WTHRESH 4 /**< Default values of RX write-back threshold reg. */
+
+/*
+ * These default values are optimized for use with the Intel(R) 82599 10 GbE
+ * Controller and the DPDK ixgbe PMD. Consider using other values for other
+ * network controllers and/or network drivers.
+ */
+#define TX_PTHRESH 36 /**< Default values of TX prefetch threshold reg. */
+#define TX_HTHRESH 0  /**< Default values of TX host threshold reg. */
+#define TX_WTHRESH 0  /**< Default values of TX write-back threshold reg. */
+
+#define BURST_TX_DRAIN_US 100 /* TX drain every ~100us */
+
+#define NB_SOCKETS 8
+
+/* Configure how many packets ahead to prefetch, when reading packets */
+#define PREFETCH_OFFSET	3
+
+/*
+ * 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 ports_eth_addr[RTE_MAX_ETHPORTS];
+
+/* mask of enabled ports */
+static uint32_t enabled_port_mask = 0;
+/* Ports set in promiscuous mode off by default. */
+static int promiscuous_on = 0;
+/* NUMA is enabled by default. */
+static int numa_on = 1;
+
+enum freq_scale_hint_t
+{
+	FREQ_LOWER    =      -1,
+	FREQ_CURRENT  =       0,
+	FREQ_HIGHER   =       1,
+	FREQ_HIGHEST  =       2
+};
+
+struct mbuf_table {
+	uint16_t len;
+	struct rte_mbuf *m_table[MAX_PKT_BURST];
+};
+
+struct lcore_rx_queue {
+	uint8_t port_id;
+	uint8_t queue_id;
+	enum freq_scale_hint_t freq_up_hint;
+	uint32_t zero_rx_packet_count;
+	uint32_t idle_hint;
+} __rte_cache_aligned;
+
+#define MAX_RX_QUEUE_PER_LCORE 16
+#define MAX_TX_QUEUE_PER_PORT RTE_MAX_ETHPORTS
+#define MAX_RX_QUEUE_PER_PORT 128
+
+#define MAX_LCORE_PARAMS 1024
+struct lcore_params {
+	uint8_t port_id;
+	uint8_t queue_id;
+	uint8_t lcore_id;
+} __rte_cache_aligned;
+
+static struct lcore_params lcore_params_array[MAX_LCORE_PARAMS];
+static struct lcore_params lcore_params_array_default[] = {
+	{0, 0, 2},
+	{0, 1, 2},
+	{0, 2, 2},
+	{1, 0, 2},
+	{1, 1, 2},
+	{1, 2, 2},
+	{2, 0, 2},
+	{3, 0, 3},
+	{3, 1, 3},
+};
+
+static struct lcore_params * lcore_params = lcore_params_array_default;
+static uint16_t nb_lcore_params = sizeof(lcore_params_array_default) /
+				sizeof(lcore_params_array_default[0]);
+
+static struct rte_eth_conf port_conf = {
+	.rxmode = {
+		.max_rx_pkt_len = ETHER_MAX_LEN,
+		.split_hdr_size = 0,
+		.header_split   = 0, /**< Header Split disabled */
+		.hw_ip_checksum = 1, /**< 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 */
+	},
+	.rx_adv_conf = {
+		.rss_conf = {
+			.rss_key = NULL,
+			.rss_hf = ETH_RSS_IPV4 | ETH_RSS_IPV6,
+		},
+	},
+	.txmode = {
+		.mq_mode = ETH_DCB_NONE,
+	},
+};
+
+static const struct rte_eth_rxconf rx_conf = {
+	.rx_thresh = {
+		.pthresh = RX_PTHRESH,
+		.hthresh = RX_HTHRESH,
+		.wthresh = RX_WTHRESH,
+	},
+	.rx_free_thresh = 32,
+};
+
+static const struct rte_eth_txconf tx_conf = {
+	.tx_thresh = {
+		.pthresh = TX_PTHRESH,
+		.hthresh = TX_HTHRESH,
+		.wthresh = TX_WTHRESH,
+	},
+	.tx_free_thresh = 0, /* Use PMD default values */
+	.tx_rs_thresh = 0, /* Use PMD default values */
+	.txq_flags = 0x0,
+};
+
+static struct rte_mempool * pktmbuf_pool[NB_SOCKETS];
+
+
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_EXACT_MATCH)
+
+#ifdef RTE_MACHINE_CPUFLAG_SSE4_2
+#include <rte_hash_crc.h>
+#define DEFAULT_HASH_FUNC       rte_hash_crc
+#else
+#include <rte_jhash.h>
+#define DEFAULT_HASH_FUNC       rte_jhash
+#endif
+
+struct ipv4_5tuple {
+	uint32_t ip_dst;
+	uint32_t ip_src;
+	uint16_t port_dst;
+	uint16_t port_src;
+	uint8_t  proto;
+} __attribute__((__packed__));
+
+struct ipv6_5tuple {
+	uint8_t  ip_dst[IPV6_ADDR_LEN];
+	uint8_t  ip_src[IPV6_ADDR_LEN];
+	uint16_t port_dst;
+	uint16_t port_src;
+	uint8_t  proto;
+} __attribute__((__packed__));
+
+struct ipv4_l3fwd_route {
+	struct ipv4_5tuple key;
+	uint8_t if_out;
+};
+
+struct ipv6_l3fwd_route {
+	struct ipv6_5tuple key;
+	uint8_t if_out;
+};
+
+static struct ipv4_l3fwd_route ipv4_l3fwd_route_array[] = {
+	{{IPv4(100,10,0,1), IPv4(200,10,0,1), 101, 11, IPPROTO_TCP}, 0},
+	{{IPv4(100,20,0,2), IPv4(200,20,0,2), 102, 12, IPPROTO_TCP}, 1},
+	{{IPv4(100,30,0,3), IPv4(200,30,0,3), 103, 13, IPPROTO_TCP}, 2},
+	{{IPv4(100,40,0,4), IPv4(200,40,0,4), 104, 14, IPPROTO_TCP}, 3},
+};
+
+static struct ipv6_l3fwd_route ipv6_l3fwd_route_array[] = {
+	{
+		{
+			{0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			 0x02, 0x1b, 0x21, 0xff, 0xfe, 0x91, 0x38, 0x05},
+			{0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			 0x02, 0x1e, 0x67, 0xff, 0xfe, 0x0d, 0xb6, 0x0a},
+			 1, 10, IPPROTO_UDP
+		}, 4
+	},
+};
+
+typedef struct rte_hash lookup_struct_t;
+static lookup_struct_t *ipv4_l3fwd_lookup_struct[NB_SOCKETS];
+static lookup_struct_t *ipv6_l3fwd_lookup_struct[NB_SOCKETS];
+
+#define L3FWD_HASH_ENTRIES	1024
+
+#define IPV4_L3FWD_NUM_ROUTES \
+	(sizeof(ipv4_l3fwd_route_array) / sizeof(ipv4_l3fwd_route_array[0]))
+
+#define IPV6_L3FWD_NUM_ROUTES \
+	(sizeof(ipv6_l3fwd_route_array) / sizeof(ipv6_l3fwd_route_array[0]))
+
+static uint8_t ipv4_l3fwd_out_if[L3FWD_HASH_ENTRIES] __rte_cache_aligned;
+static uint8_t ipv6_l3fwd_out_if[L3FWD_HASH_ENTRIES] __rte_cache_aligned;
+#endif
+
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_LPM)
+struct ipv4_l3fwd_route {
+	uint32_t ip;
+	uint8_t  depth;
+	uint8_t  if_out;
+};
+
+static struct ipv4_l3fwd_route ipv4_l3fwd_route_array[] = {
+	{IPv4(1,1,1,0), 24, 0},
+	{IPv4(2,1,1,0), 24, 1},
+	{IPv4(3,1,1,0), 24, 2},
+	{IPv4(4,1,1,0), 24, 3},
+	{IPv4(5,1,1,0), 24, 4},
+	{IPv4(6,1,1,0), 24, 5},
+	{IPv4(7,1,1,0), 24, 6},
+	{IPv4(8,1,1,0), 24, 7},
+};
+
+#define IPV4_L3FWD_NUM_ROUTES \
+	(sizeof(ipv4_l3fwd_route_array) / sizeof(ipv4_l3fwd_route_array[0]))
+
+#define IPV4_L3FWD_LPM_MAX_RULES     1024
+
+typedef struct rte_lpm lookup_struct_t;
+static lookup_struct_t *ipv4_l3fwd_lookup_struct[NB_SOCKETS];
+#endif
+
+struct lcore_conf {
+	uint16_t n_rx_queue;
+	struct lcore_rx_queue rx_queue_list[MAX_RX_QUEUE_PER_LCORE];
+	uint16_t tx_queue_id[RTE_MAX_ETHPORTS];
+	struct mbuf_table tx_mbufs[RTE_MAX_ETHPORTS];
+	lookup_struct_t * ipv4_lookup_struct;
+	lookup_struct_t * ipv6_lookup_struct;
+} __rte_cache_aligned;
+
+struct lcore_stats {
+	/* total sleep time in ms since last frequency scaling down */
+	uint32_t sleep_time;
+	/* number of long sleep recently */
+	uint32_t nb_long_sleep;
+	/* freq. scaling up trend */
+	uint32_t trend;
+	/* total packet processed recently */
+	uint64_t nb_rx_processed;
+	/* total iterations looped recently */
+	uint64_t nb_iteration_looped;
+	uint32_t padding[9]; 
+} __rte_cache_aligned;
+
+static struct lcore_conf lcore_conf[RTE_MAX_LCORE] __rte_cache_aligned;
+static struct lcore_stats stats[RTE_MAX_LCORE] __rte_cache_aligned;
+static struct rte_timer power_timers[RTE_MAX_LCORE];
+
+static inline uint32_t power_idle_heuristic(uint32_t zero_rx_packet_count);
+static inline enum freq_scale_hint_t power_freq_scaleup_heuristic( \
+				unsigned lcore_id, uint32_t rx_ring_length);
+
+/* exit signal handler */
+static void
+signal_exit_now(int sigtype)
+{
+	unsigned lcore_id;
+	int ret;
+
+	if (sigtype == SIGINT) {
+		for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
+			if (rte_lcore_is_enabled(lcore_id) == 0)
+				continue;
+
+			/* init power management library */
+			ret = rte_power_exit(lcore_id);
+			if (ret)
+				rte_exit(EXIT_FAILURE, "Power management "
+					"library de-initialization failed on "
+							"core%u\n", lcore_id);
+		}
+	}
+
+	rte_exit(EXIT_SUCCESS, "User forced exit\n");
+}
+
+/*  Freqency scale down timer callback */
+static void
+power_timer_cb(__attribute__((unused)) struct rte_timer *tim,
+			  __attribute__((unused)) void *arg)
+{
+	uint64_t hz;
+	float sleep_time_ratio;
+	unsigned lcore_id = rte_lcore_id();
+
+	/* accumulate total execution time in us when callback is invoked */
+	sleep_time_ratio = (float)(stats[lcore_id].sleep_time) /
+					(float)SCALING_PERIOD;
+		
+	/**
+	 * check whether need to scale down frequency a step if it sleep a lot.
+	 */
+	if (sleep_time_ratio >= SCALING_DOWN_TIME_RATIO_THRESHOLD)
+		rte_power_freq_down(lcore_id);
+	else if ( (unsigned)(stats[lcore_id].nb_rx_processed /
+		stats[lcore_id].nb_iteration_looped) < MAX_PKT_BURST)
+		/**
+		 * scale down a step if average packet per iteration less
+		 * than expectation.
+		 */
+		rte_power_freq_down(lcore_id);
+
+	/**
+	 * initialize another timer according to current frequency to ensure
+	 * timer interval is relatively fixed.
+	 */
+	hz = rte_get_timer_hz();
+	rte_timer_reset(&power_timers[lcore_id], hz/TIMER_NUMBER_PER_SECOND,
+				SINGLE, lcore_id, power_timer_cb, NULL);
+
+	stats[lcore_id].nb_rx_processed = 0;
+	stats[lcore_id].nb_iteration_looped = 0;
+
+	stats[lcore_id].sleep_time = 0;
+}
+
+/* Send burst of packets on an output interface */
+static inline int
+send_burst(struct lcore_conf *qconf, uint16_t n, uint8_t port)
+{
+	struct rte_mbuf **m_table;
+	int ret;
+	uint16_t queueid;
+
+	queueid = qconf->tx_queue_id[port];
+	m_table = (struct rte_mbuf **)qconf->tx_mbufs[port].m_table;
+
+	ret = rte_eth_tx_burst(port, queueid, m_table, n);
+	if (unlikely(ret < n)) {
+		do {
+			rte_pktmbuf_free(m_table[ret]);
+		} while (++ret < n);
+	}
+
+	return 0;
+}
+
+/* Enqueue a single packet, and send burst if queue is filled */
+static inline int
+send_single_packet(struct rte_mbuf *m, uint8_t port)
+{
+	uint32_t lcore_id;
+	uint16_t len;
+	struct lcore_conf *qconf;
+
+	lcore_id = rte_lcore_id();
+
+	qconf = &lcore_conf[lcore_id];
+	len = qconf->tx_mbufs[port].len;
+	qconf->tx_mbufs[port].m_table[len] = m;
+	len++;
+
+	/* enough pkts to be sent */
+	if (unlikely(len == MAX_PKT_BURST)) {
+		send_burst(qconf, MAX_PKT_BURST, port);
+		len = 0;
+	}
+
+	qconf->tx_mbufs[port].len = len;
+	return 0;
+}
+
+#ifdef DO_RFC_1812_CHECKS
+static inline int
+is_valid_ipv4_pkt(struct ipv4_hdr *pkt, uint32_t link_len)
+{
+	/* From http://www.rfc-editor.org/rfc/rfc1812.txt section 5.2.2 */
+	/*
+	 * 1. The packet length reported by the Link Layer must be large
+	 * enough to hold the minimum length legal IP datagram (20 bytes).
+	 */
+	if (link_len < sizeof(struct ipv4_hdr))
+		return -1;
+
+	/* 2. The IP checksum must be correct. */
+	/* this is checked in H/W */
+
+	/*
+	 * 3. The IP version number must be 4. If the version number is not 4
+	 * then the packet may be another version of IP, such as IPng or
+	 * ST-II.
+	 */
+	if (((pkt->version_ihl) >> 4) != 4)
+		return -3;
+	/*
+	 * 4. The IP header length field must be large enough to hold the
+	 * minimum length legal IP datagram (20 bytes = 5 words).
+	 */
+	if ((pkt->version_ihl & 0xf) < 5)
+		return -4;
+
+	/*
+	 * 5. The IP total length field must be large enough to hold the IP
+	 * datagram header, whose length is specified in the IP header length
+	 * field.
+	 */
+	if (rte_cpu_to_be_16(pkt->total_length) < sizeof(struct ipv4_hdr))
+		return -5;
+
+	return 0;
+}
+#endif
+
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_EXACT_MATCH)
+static void
+print_ipv4_key(struct ipv4_5tuple key)
+{
+	printf("IP dst = %08x, IP src = %08x, port dst = %d, port src = %d, "
+		"proto = %d\n", (unsigned)key.ip_dst, (unsigned)key.ip_src,
+				key.port_dst, key.port_src, key.proto);
+}
+static void
+print_ipv6_key(struct ipv6_5tuple key)
+{
+	printf( "IP dst = " IPv6_BYTES_FMT ", IP src = " IPv6_BYTES_FMT ", "
+	        "port dst = %d, port src = %d, proto = %d\n",
+	        IPv6_BYTES(key.ip_dst), IPv6_BYTES(key.ip_src),
+	        key.port_dst, key.port_src, key.proto);
+}
+
+static inline uint8_t
+get_ipv4_dst_port(struct ipv4_hdr *ipv4_hdr, uint8_t portid,
+		lookup_struct_t * ipv4_l3fwd_lookup_struct)
+{
+	struct ipv4_5tuple key;
+	struct tcp_hdr *tcp;
+	struct udp_hdr *udp;
+	int ret = 0;
+
+	key.ip_dst = rte_be_to_cpu_32(ipv4_hdr->dst_addr);
+	key.ip_src = rte_be_to_cpu_32(ipv4_hdr->src_addr);
+	key.proto = ipv4_hdr->next_proto_id;
+
+	switch (ipv4_hdr->next_proto_id) {
+	case IPPROTO_TCP:
+		tcp = (struct tcp_hdr *)((unsigned char *)ipv4_hdr +
+					sizeof(struct ipv4_hdr));
+		key.port_dst = rte_be_to_cpu_16(tcp->dst_port);
+		key.port_src = rte_be_to_cpu_16(tcp->src_port);
+		break;
+
+	case IPPROTO_UDP:
+		udp = (struct udp_hdr *)((unsigned char *)ipv4_hdr +
+					sizeof(struct ipv4_hdr));
+		key.port_dst = rte_be_to_cpu_16(udp->dst_port);
+		key.port_src = rte_be_to_cpu_16(udp->src_port);
+		break;
+
+	default:
+		key.port_dst = 0;
+		key.port_src = 0;
+		break;
+	}
+
+	/* Find destination port */
+	ret = rte_hash_lookup(ipv4_l3fwd_lookup_struct, (const void *)&key);
+	return (uint8_t)((ret < 0)? portid : ipv4_l3fwd_out_if[ret]);
+}
+
+static inline uint8_t
+get_ipv6_dst_port(struct ipv6_hdr *ipv6_hdr,  uint8_t portid,
+			lookup_struct_t *ipv6_l3fwd_lookup_struct)
+{
+	struct ipv6_5tuple key;
+	struct tcp_hdr *tcp;
+	struct udp_hdr *udp;
+	int ret = 0;
+
+	memcpy(key.ip_dst, ipv6_hdr->dst_addr, IPV6_ADDR_LEN);
+	memcpy(key.ip_src, ipv6_hdr->src_addr, IPV6_ADDR_LEN);
+
+	key.proto = ipv6_hdr->proto;
+
+	switch (ipv6_hdr->proto) {
+	case IPPROTO_TCP:
+		tcp = (struct tcp_hdr *)((unsigned char *) ipv6_hdr +
+					sizeof(struct ipv6_hdr));
+		key.port_dst = rte_be_to_cpu_16(tcp->dst_port);
+		key.port_src = rte_be_to_cpu_16(tcp->src_port);
+		break;
+
+	case IPPROTO_UDP:
+		udp = (struct udp_hdr *)((unsigned char *) ipv6_hdr +
+					sizeof(struct ipv6_hdr));
+		key.port_dst = rte_be_to_cpu_16(udp->dst_port);
+		key.port_src = rte_be_to_cpu_16(udp->src_port);
+		break;
+
+	default:
+		key.port_dst = 0;
+		key.port_src = 0;
+		break;
+	}
+
+	/* Find destination port */
+	ret = rte_hash_lookup(ipv6_l3fwd_lookup_struct, (const void *)&key);
+	return (uint8_t)((ret < 0)? portid : ipv6_l3fwd_out_if[ret]);
+}
+#endif
+
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_LPM)
+static inline uint8_t
+get_ipv4_dst_port(struct ipv4_hdr *ipv4_hdr, uint8_t portid,
+		lookup_struct_t *ipv4_l3fwd_lookup_struct)
+{
+	uint8_t next_hop;
+
+	return (uint8_t) ((rte_lpm_lookup(ipv4_l3fwd_lookup_struct,
+			rte_be_to_cpu_32(ipv4_hdr->dst_addr), &next_hop) == 0)?
+			next_hop : portid);
+}
+#endif
+
+static inline void
+l3fwd_simple_forward(struct rte_mbuf *m, uint8_t portid,
+				struct lcore_conf *qconf)
+{
+	struct ether_hdr *eth_hdr;
+	struct ipv4_hdr *ipv4_hdr;
+	void *d_addr_bytes;
+	uint8_t dst_port;
+
+	eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
+
+	if (m->ol_flags & PKT_RX_IPV4_HDR) {
+		/* Handle IPv4 headers.*/
+		ipv4_hdr =
+			(struct ipv4_hdr *)(rte_pktmbuf_mtod(m, unsigned char*)
+						+ sizeof(struct ether_hdr));
+
+#ifdef DO_RFC_1812_CHECKS
+		/* Check to make sure the packet is valid (RFC1812) */
+		if (is_valid_ipv4_pkt(ipv4_hdr, m->pkt.pkt_len) < 0) {
+			rte_pktmbuf_free(m);
+			return;
+		}
+#endif
+
+		dst_port = get_ipv4_dst_port(ipv4_hdr, portid,
+					qconf->ipv4_lookup_struct);
+		if (dst_port >= RTE_MAX_ETHPORTS ||
+				(enabled_port_mask & 1 << dst_port) == 0)
+			dst_port = portid;
+
+		/* 02:00:00:00:00:xx */
+		d_addr_bytes = &eth_hdr->d_addr.addr_bytes[0];
+		*((uint64_t *)d_addr_bytes) =
+			0x000000000002 + ((uint64_t)dst_port << 40);
+
+#ifdef DO_RFC_1812_CHECKS
+		/* Update time to live and header checksum */
+		--(ipv4_hdr->time_to_live);
+		++(ipv4_hdr->hdr_checksum);
+#endif
+
+		/* src addr */
+		ether_addr_copy(&ports_eth_addr[dst_port], &eth_hdr->s_addr);
+
+		send_single_packet(m, dst_port);
+	}
+	else {
+		/* Handle IPv6 headers.*/
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_EXACT_MATCH)
+		struct ipv6_hdr *ipv6_hdr;
+
+		ipv6_hdr =
+			(struct ipv6_hdr *)(rte_pktmbuf_mtod(m, unsigned char*)
+						+ sizeof(struct ether_hdr));
+
+		dst_port = get_ipv6_dst_port(ipv6_hdr, portid,
+					qconf->ipv6_lookup_struct);
+
+		if (dst_port >= RTE_MAX_ETHPORTS ||
+				(enabled_port_mask & 1 << dst_port) == 0)
+			dst_port = portid;
+
+		/* 02:00:00:00:00:xx */
+		d_addr_bytes = &eth_hdr->d_addr.addr_bytes[0];
+		*((uint64_t *)d_addr_bytes) =
+			0x000000000002 + ((uint64_t)dst_port << 40);
+
+		/* src addr */
+		ether_addr_copy(&ports_eth_addr[dst_port], &eth_hdr->s_addr);
+
+		send_single_packet(m, dst_port);
+#else
+		/* We don't currently handle IPv6 packets in LPM mode. */
+		rte_pktmbuf_free(m);
+#endif
+	}
+
+}
+
+#define SLEEP_GEAR1_THRESHOLD            100
+#define SLEEP_GEAR2_THRESHOLD            1000
+
+static inline uint32_t
+power_idle_heuristic(uint32_t zero_rx_packet_count)
+{
+	/* If zero count is less than 100, use it as the sleep time in us */
+	if (zero_rx_packet_count < SLEEP_GEAR1_THRESHOLD)
+		return zero_rx_packet_count;
+	/* If zero count is less than 1000, sleep time should be 100 us */
+	else if ((zero_rx_packet_count >= SLEEP_GEAR1_THRESHOLD) &&
+			(zero_rx_packet_count < SLEEP_GEAR2_THRESHOLD))
+		return SLEEP_GEAR1_THRESHOLD;
+	/* If zero count is greater than 1000, sleep time should be 1000 us */
+	else if (zero_rx_packet_count >= SLEEP_GEAR2_THRESHOLD)
+		return SLEEP_GEAR2_THRESHOLD;
+
+	return 0;
+}
+
+static inline enum freq_scale_hint_t
+power_freq_scaleup_heuristic(unsigned lcore_id, uint32_t rx_ring_length)
+{
+/**
+ * HW Rx queue size is 128 by default, Rx burst read at maximum 32 entries
+ * per iteration
+ */
+#define FREQ_GEAR1_RX_PACKET_THRESHOLD             MAX_PKT_BURST
+#define FREQ_GEAR2_RX_PACKET_THRESHOLD             64
+#define FREQ_GEAR3_RX_PACKET_THRESHOLD             96
+#define FREQ_UP_TREND1_ACC   1
+#define FREQ_UP_TREND2_ACC   100
+#define FREQ_UP_THRESHOLD    10000
+
+	/**
+	 * there are received packets to process, staying at C0 state while
+	 * trying to scale up frequency depending on how many entries on h/w
+	 * queue. Determine frequency scaleup trend based on availiable entries
+	 * on Rx queues.
+	 */
+	if (rx_ring_length > FREQ_GEAR3_RX_PACKET_THRESHOLD) {
+		stats[lcore_id].trend = 0;
+		return FREQ_HIGHEST;
+	} else if (rx_ring_length > FREQ_GEAR2_RX_PACKET_THRESHOLD)
+		stats[lcore_id].trend += FREQ_UP_TREND2_ACC;
+	else if (rx_ring_length > FREQ_GEAR1_RX_PACKET_THRESHOLD)
+		stats[lcore_id].trend += FREQ_UP_TREND1_ACC;
+
+	if (stats[lcore_id].trend > FREQ_UP_THRESHOLD) {
+		stats[lcore_id].trend = 0;
+		return FREQ_HIGHER;
+	}
+
+	return FREQ_CURRENT;
+}
+
+/* main processing loop */
+static int
+main_loop(__attribute__((unused)) void *dummy)
+{
+	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
+	unsigned lcore_id;
+	uint64_t prev_tsc, diff_tsc, cur_tsc;
+	uint64_t prev_tsc_power = 0, cur_tsc_power, diff_tsc_power;
+	int i, j, nb_rx;
+	uint8_t portid, queueid;
+	struct lcore_conf *qconf;
+	struct lcore_rx_queue *rx_queue;
+	uint32_t rx_ring_length;
+	enum freq_scale_hint_t lcore_scaleup_hint;
+	
+	uint32_t lcore_rx_idle_count = 0;
+	uint32_t lcore_idle_hint = 0;
+
+	const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S * BURST_TX_DRAIN_US;
+
+	prev_tsc = 0;
+
+	lcore_id = rte_lcore_id();
+	qconf = &lcore_conf[lcore_id];
+
+	if (qconf->n_rx_queue == 0) {
+		RTE_LOG(INFO, L3FWD_POWER, "lcore %u has nothing to do\n", lcore_id);
+		return 0;
+	}
+
+	RTE_LOG(INFO, L3FWD_POWER, "entering main loop on lcore %u\n", lcore_id);
+
+	for (i = 0; i < qconf->n_rx_queue; i++) {
+
+		portid = qconf->rx_queue_list[i].port_id;
+		queueid = qconf->rx_queue_list[i].queue_id;
+		RTE_LOG(INFO, L3FWD_POWER, " -- lcoreid=%u portid=%hhu "
+			"rxqueueid=%hhu\n", lcore_id, portid, queueid);
+	}
+
+	while (1) {
+		stats[lcore_id].nb_iteration_looped++;
+
+		cur_tsc = rte_rdtsc();
+		cur_tsc_power = cur_tsc;
+
+		/*
+		 * TX burst queue drain
+		 */
+		diff_tsc = cur_tsc - prev_tsc;
+		if (unlikely(diff_tsc > drain_tsc)) {
+
+			/*
+			 * This could be optimized (use queueid instead of
+			 * portid), but it is not called so often
+			 */
+			for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++) {
+				if (qconf->tx_mbufs[portid].len == 0)
+					continue;
+				send_burst(&lcore_conf[lcore_id],
+					qconf->tx_mbufs[portid].len,
+					portid);
+				qconf->tx_mbufs[portid].len = 0;
+			}
+
+			prev_tsc = cur_tsc;
+		}
+
+		diff_tsc_power = cur_tsc_power - prev_tsc_power;
+		if (diff_tsc_power > TIMER_RESOLUTION_CYCLES) {
+			rte_timer_manage();
+			prev_tsc_power = cur_tsc_power;
+		}
+
+		/*
+		 * Read packet from RX queues
+		 */
+		lcore_scaleup_hint = FREQ_CURRENT;
+		lcore_rx_idle_count = 0;
+		for (i = 0; i < qconf->n_rx_queue; ++i) {
+			rx_queue = &(qconf->rx_queue_list[i]);
+			rx_queue->idle_hint = 0;
+			portid = rx_queue->port_id;
+			queueid = rx_queue->queue_id;
+
+			nb_rx = rte_eth_rx_burst(portid, queueid, pkts_burst,
+								MAX_PKT_BURST);
+			stats[lcore_id].nb_rx_processed += nb_rx;
+			if (unlikely(nb_rx == 0)) {
+				/**
+				 * no packet received from rx queue, try to
+				 * sleep for a while forcing CPU enter deeper
+				 * C states.
+				 */
+				rx_queue->zero_rx_packet_count++;
+
+				if (rx_queue->zero_rx_packet_count <=
+							MIN_ZERO_POLL_COUNT)
+					continue;
+
+				rx_queue->idle_hint = power_idle_heuristic(\
+					rx_queue->zero_rx_packet_count);
+				lcore_rx_idle_count++;
+			} else {
+				/**
+				 * get availiable descriptor number via MMIO read is costly,
+                                 * so only do it when recent poll returns maximum number. 
+				 */
+				if (nb_rx >= MAX_PKT_BURST)
+				     rx_ring_length = rte_eth_rx_queue_count(portid, queueid);
+				else 
+				     rx_ring_length = 0;
+
+				rx_queue->zero_rx_packet_count = 0;
+
+				/**
+				 * do not scale up frequency immediately as
+				 * user to kernel space communication is costly
+				 * which might impact packet I/O for received
+				 * packets.
+				 */
+				rx_queue->freq_up_hint =
+					power_freq_scaleup_heuristic(lcore_id,
+							rx_ring_length);
+ 			}
+
+			/* Prefetch first packets */
+			for (j = 0; j < PREFETCH_OFFSET && j < nb_rx; j++) {
+				rte_prefetch0(rte_pktmbuf_mtod(
+						pkts_burst[j], void *));
+			}
+
+			/* Prefetch and forward already prefetched packets */
+			for (j = 0; j < (nb_rx - PREFETCH_OFFSET); j++) {
+				rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[
+						j + PREFETCH_OFFSET], void *));
+				l3fwd_simple_forward(pkts_burst[j], portid,
+								qconf);
+			}
+
+			/* Forward remaining prefetched packets */
+			for (; j < nb_rx; j++) {
+				l3fwd_simple_forward(pkts_burst[j], portid,
+								qconf);
+			}
+		}
+
+		if (likely(lcore_rx_idle_count != qconf->n_rx_queue)) {
+			for (i = 1, lcore_scaleup_hint =
+				qconf->rx_queue_list[0].freq_up_hint;
+					i < qconf->n_rx_queue; ++i) {
+				rx_queue = &(qconf->rx_queue_list[i]);
+				if (rx_queue->freq_up_hint >
+						lcore_scaleup_hint)
+					lcore_scaleup_hint =
+						rx_queue->freq_up_hint;
+			}	
+		
+			if (lcore_scaleup_hint == FREQ_HIGHEST)
+				rte_power_freq_max(lcore_id);
+			else if (lcore_scaleup_hint == FREQ_HIGHER)
+				rte_power_freq_up(lcore_id);
+		} else {
+			/**
+			 * All Rx queues empty in recent consecutive polls,
+			 * sleep in a conservative manner, meaning sleep as
+ 			 * less as possible.
+ 			 */
+			for (i = 1, lcore_idle_hint =
+				qconf->rx_queue_list[0].idle_hint;
+					i < qconf->n_rx_queue; ++i) {
+				rx_queue = &(qconf->rx_queue_list[i]);
+				if (rx_queue->idle_hint < lcore_idle_hint)
+					lcore_idle_hint = rx_queue->idle_hint;
+			}
+
+			if ( lcore_idle_hint < SLEEP_GEAR1_THRESHOLD)
+				/**
+				 * execute "pause" instruction to avoid context
+				 * switch for short sleep.
+ 				 */
+				rte_delay_us(lcore_idle_hint);
+			else
+				/* long sleep force runing thread to suspend */
+				usleep(lcore_idle_hint);
+
+			stats[lcore_id].sleep_time += lcore_idle_hint;
+		}
+	}
+}
+
+static int
+check_lcore_params(void)
+{
+	uint8_t queue, lcore;
+	uint16_t i;
+	int socketid;
+
+	for (i = 0; i < nb_lcore_params; ++i) {
+		queue = lcore_params[i].queue_id;
+		if (queue >= MAX_RX_QUEUE_PER_PORT) {
+			printf("invalid queue number: %hhu\n", queue);
+			return -1;
+		}
+		lcore = lcore_params[i].lcore_id;
+		if (!rte_lcore_is_enabled(lcore)) {
+			printf("error: lcore %hhu is not enabled in lcore "
+							"mask\n", lcore);
+			return -1;
+		}
+		if ((socketid = rte_lcore_to_socket_id(lcore) != 0) &&
+							(numa_on == 0)) {
+			printf("warning: lcore %hhu is on socket %d with numa "
+						"off\n", lcore, socketid);
+		}
+	}
+	return 0;
+}
+
+static int
+check_port_config(const unsigned nb_ports)
+{
+	unsigned portid;
+	uint16_t i;
+
+	for (i = 0; i < nb_lcore_params; ++i) {
+		portid = lcore_params[i].port_id;
+		if ((enabled_port_mask & (1 << portid)) == 0) {
+			printf("port %u is not enabled in port mask\n",
+								portid);
+			return -1;
+		}
+		if (portid >= nb_ports) {
+			printf("port %u is not present on the board\n",
+								portid);
+			return -1;
+		}
+	}
+	return 0;
+}
+
+static uint8_t
+get_port_n_rx_queues(const uint8_t port)
+{
+	int queue = -1;
+	uint16_t i;
+
+	for (i = 0; i < nb_lcore_params; ++i) {
+		if (lcore_params[i].port_id == port &&
+				lcore_params[i].queue_id > queue)
+			queue = lcore_params[i].queue_id;
+	}
+	return (uint8_t)(++queue);
+}
+
+static int
+init_lcore_rx_queues(void)
+{
+	uint16_t i, nb_rx_queue;
+	uint8_t lcore;
+
+	for (i = 0; i < nb_lcore_params; ++i) {
+		lcore = lcore_params[i].lcore_id;
+		nb_rx_queue = lcore_conf[lcore].n_rx_queue;
+		if (nb_rx_queue >= MAX_RX_QUEUE_PER_LCORE) {
+			printf("error: too many queues (%u) for lcore: %u\n",
+				(unsigned)nb_rx_queue + 1, (unsigned)lcore);
+			return -1;
+		} else {
+			lcore_conf[lcore].rx_queue_list[nb_rx_queue].port_id =
+				lcore_params[i].port_id;
+			lcore_conf[lcore].rx_queue_list[nb_rx_queue].queue_id =
+				lcore_params[i].queue_id;
+			lcore_conf[lcore].n_rx_queue++;
+		}
+	}
+	return 0;
+}
+
+/* display usage */
+static void
+print_usage(const char *prgname)
+{
+	printf ("%s [EAL options] -- -p PORTMASK -P"
+		"  [--config (port,queue,lcore)[,(port,queue,lcore]]"
+		"  [--enable-jumbo [--max-pkt-len PKTLEN]]\n"
+		"  -p PORTMASK: hexadecimal bitmask of ports to configure\n"
+		"  -P : enable promiscuous mode\n"
+		"  --config (port,queue,lcore): rx queues configuration\n"
+		"  --no-numa: optional, disable numa awareness\n"
+		"  --enable-jumbo: enable jumbo frame"
+		" which max packet len is PKTLEN in decimal (64-9600)\n",
+		prgname);
+}
+
+static int parse_max_pkt_len(const char *pktlen)
+{
+	char *end = NULL;
+	unsigned long len;
+
+	/* parse decimal string */
+	len = strtoul(pktlen, &end, 10);
+	if ((pktlen[0] == '\0') || (end == NULL) || (*end != '\0'))
+		return -1;
+
+	if (len == 0)
+		return -1;
+
+	return len;
+}
+
+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;
+}
+
+static int
+parse_config(const char *q_arg)
+{
+	char s[256];
+	const char *p, *p0 = q_arg;
+	char *end;
+	enum fieldnames {
+		FLD_PORT = 0,
+		FLD_QUEUE,
+		FLD_LCORE,
+		_NUM_FLD
+	};
+	unsigned long int_fld[_NUM_FLD];
+	char *str_fld[_NUM_FLD];
+	int i;
+	unsigned size;
+
+	nb_lcore_params = 0;
+
+	while ((p = strchr(p0,'(')) != NULL) {
+		++p;
+		if((p0 = strchr(p,')')) == NULL)
+			return -1;
+
+		size = p0 - p;
+		if(size >= sizeof(s))
+			return -1;
+
+		rte_snprintf(s, sizeof(s), "%.*s", size, p);
+		if (rte_strsplit(s, sizeof(s), str_fld, _NUM_FLD, ',') !=
+								_NUM_FLD)
+			return -1;
+		for (i = 0; i < _NUM_FLD; i++){
+			errno = 0;
+			int_fld[i] = strtoul(str_fld[i], &end, 0);
+			if (errno != 0 || end == str_fld[i] || int_fld[i] >
+									255)
+				return -1;
+		}
+		if (nb_lcore_params >= MAX_LCORE_PARAMS) {
+			printf("exceeded max number of lcore params: %hu\n",
+				nb_lcore_params);
+			return -1;
+		}
+		lcore_params_array[nb_lcore_params].port_id =
+				(uint8_t)int_fld[FLD_PORT];
+		lcore_params_array[nb_lcore_params].queue_id =
+				(uint8_t)int_fld[FLD_QUEUE];
+		lcore_params_array[nb_lcore_params].lcore_id =
+				(uint8_t)int_fld[FLD_LCORE];
+		++nb_lcore_params;
+	}
+	lcore_params = lcore_params_array;
+
+	return 0;
+}
+
+/* Parse the argument given in the command line of the application */
+static int
+parse_args(int argc, char **argv)
+{
+	int opt, ret;
+	char **argvopt;
+	int option_index;
+	char *prgname = argv[0];
+	static struct option lgopts[] = {
+		{"config", 1, 0, 0},
+		{"no-numa", 0, 0, 0},
+		{"enable-jumbo", 0, 0, 0},
+		{NULL, 0, 0, 0}
+	};
+
+	argvopt = argv;
+
+	while ((opt = getopt_long(argc, argvopt, "p: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;
+		case 'P':
+			printf("Promiscuous mode selected\n");
+			promiscuous_on = 1;
+			break;
+
+		/* long options */
+		case 0:
+			if (!strncmp(lgopts[option_index].name, "config", 6)) {
+				ret = parse_config(optarg);
+				if (ret) {
+					printf("invalid config\n");
+					print_usage(prgname);
+					return -1;
+				}
+			}
+
+			if (!strncmp(lgopts[option_index].name,
+						"no-numa", 7)) {
+				printf("numa is disabled \n");
+				numa_on = 0;
+			}
+			
+			if (!strncmp(lgopts[option_index].name,
+					"enable-jumbo", 12)) {
+				struct option lenopts =
+					{"max-pkt-len", required_argument, \
+									0, 0};
+
+				printf("jumbo frame is enabled \n");
+				port_conf.rxmode.jumbo_frame = 1;
+	
+				/**
+				 * if no max-pkt-len set, use the default value
+				 * ETHER_MAX_LEN
+				 */
+				if (0 == getopt_long(argc, argvopt, "",
+						&lenopts, &option_index)) {
+					ret = parse_max_pkt_len(optarg);
+					if ((ret < 64) ||
+						(ret > MAX_JUMBO_PKT_LEN)){
+						printf("invalid packet "
+								"length\n");
+						print_usage(prgname);
+						return -1;
+					}
+					port_conf.rxmode.max_rx_pkt_len = ret;
+				}
+				printf("set jumbo frame "
+					"max packet length to %u\n",
+				(unsigned int)port_conf.rxmode.max_rx_pkt_len);
+			}
+			
+			break;
+
+		default:
+			print_usage(prgname);
+			return -1;
+		}
+	}
+
+	if (optind >= 0)
+		argv[optind-1] = prgname;
+
+	ret = optind-1;
+	optind = 0; /* reset getopt lib */
+	return ret;
+}
+
+static void
+print_ethaddr(const char *name, const struct ether_addr *eth_addr)
+{
+	printf ("%s%02X:%02X:%02X:%02X:%02X:%02X", name,
+		eth_addr->addr_bytes[0],
+		eth_addr->addr_bytes[1],
+		eth_addr->addr_bytes[2],
+		eth_addr->addr_bytes[3],
+		eth_addr->addr_bytes[4],
+		eth_addr->addr_bytes[5]);
+}
+
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_EXACT_MATCH)
+static void
+setup_hash(int socketid)
+{
+	struct rte_hash_parameters ipv4_l3fwd_hash_params = {
+		.name = NULL,
+		.entries = L3FWD_HASH_ENTRIES,
+		.bucket_entries = 4,
+		.key_len = sizeof(struct ipv4_5tuple),
+		.hash_func = DEFAULT_HASH_FUNC,
+		.hash_func_init_val = 0,
+	};
+
+	struct rte_hash_parameters ipv6_l3fwd_hash_params = {
+		.name = NULL,
+		.entries = L3FWD_HASH_ENTRIES,
+		.bucket_entries = 4,
+		.key_len = sizeof(struct ipv6_5tuple),
+		.hash_func = DEFAULT_HASH_FUNC,
+		.hash_func_init_val = 0,
+	};
+
+	unsigned i;
+	int ret;
+	char s[64];
+
+	/* create ipv4 hash */
+	rte_snprintf(s, sizeof(s), "ipv4_l3fwd_hash_%d", socketid);
+	ipv4_l3fwd_hash_params.name = s;
+	ipv4_l3fwd_hash_params.socket_id = socketid;
+	ipv4_l3fwd_lookup_struct[socketid] =
+		rte_hash_create(&ipv4_l3fwd_hash_params);
+	if (ipv4_l3fwd_lookup_struct[socketid] == NULL)
+		rte_exit(EXIT_FAILURE, "Unable to create the l3fwd hash on "
+				"socket %d\n", socketid);
+
+	/* create ipv6 hash */
+	rte_snprintf(s, sizeof(s), "ipv6_l3fwd_hash_%d", socketid);
+	ipv6_l3fwd_hash_params.name = s;
+	ipv6_l3fwd_hash_params.socket_id = socketid;
+	ipv6_l3fwd_lookup_struct[socketid] =
+		rte_hash_create(&ipv6_l3fwd_hash_params);
+	if (ipv6_l3fwd_lookup_struct[socketid] == NULL)
+		rte_exit(EXIT_FAILURE, "Unable to create the l3fwd hash on "
+				"socket %d\n", socketid);
+
+
+	/* populate the ipv4 hash */
+	for (i = 0; i < IPV4_L3FWD_NUM_ROUTES; i++) {
+		ret = rte_hash_add_key (ipv4_l3fwd_lookup_struct[socketid],
+				(void *) &ipv4_l3fwd_route_array[i].key);
+		if (ret < 0) {
+			rte_exit(EXIT_FAILURE, "Unable to add entry %u to the"
+				"l3fwd hash on socket %d\n", i, socketid);
+		}
+		ipv4_l3fwd_out_if[ret] = ipv4_l3fwd_route_array[i].if_out;
+		printf("Hash: Adding key\n");
+		print_ipv4_key(ipv4_l3fwd_route_array[i].key);
+	}
+
+	/* populate the ipv6 hash */
+	for (i = 0; i < IPV6_L3FWD_NUM_ROUTES; i++) {
+		ret = rte_hash_add_key (ipv6_l3fwd_lookup_struct[socketid],
+				(void *) &ipv6_l3fwd_route_array[i].key);
+		if (ret < 0) {
+			rte_exit(EXIT_FAILURE, "Unable to add entry %u to the"
+				"l3fwd hash on socket %d\n", i, socketid);
+		}
+		ipv6_l3fwd_out_if[ret] = ipv6_l3fwd_route_array[i].if_out;
+		printf("Hash: Adding key\n");
+		print_ipv6_key(ipv6_l3fwd_route_array[i].key);
+	}
+}
+#endif
+
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_LPM)
+static void
+setup_lpm(int socketid)
+{
+	unsigned i;
+	int ret;
+	char s[64];
+
+	/* create the LPM table */
+	rte_snprintf(s, sizeof(s), "IPV4_L3FWD_LPM_%d", socketid);
+	ipv4_l3fwd_lookup_struct[socketid] = rte_lpm_create(s, socketid,
+				IPV4_L3FWD_LPM_MAX_RULES, 0);
+	if (ipv4_l3fwd_lookup_struct[socketid] == NULL)
+		rte_exit(EXIT_FAILURE, "Unable to create the l3fwd LPM table"
+				" on socket %d\n", socketid);
+
+	/* populate the LPM table */
+	for (i = 0; i < IPV4_L3FWD_NUM_ROUTES; i++) {
+		ret = rte_lpm_add(ipv4_l3fwd_lookup_struct[socketid],
+			ipv4_l3fwd_route_array[i].ip,
+			ipv4_l3fwd_route_array[i].depth,
+			ipv4_l3fwd_route_array[i].if_out);
+
+		if (ret < 0) {
+			rte_exit(EXIT_FAILURE, "Unable to add entry %u to the "
+				"l3fwd LPM table on socket %d\n",
+				i, socketid);
+		}
+
+		printf("LPM: Adding route 0x%08x / %d (%d)\n",
+			(unsigned)ipv4_l3fwd_route_array[i].ip,
+			ipv4_l3fwd_route_array[i].depth,
+			ipv4_l3fwd_route_array[i].if_out);
+	}
+}
+#endif
+
+static int
+init_mem(unsigned nb_mbuf)
+{
+	struct lcore_conf *qconf;
+	int socketid;
+	unsigned lcore_id;
+	char s[64];
+
+	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
+		if (rte_lcore_is_enabled(lcore_id) == 0)
+			continue;
+
+		if (numa_on)
+			socketid = rte_lcore_to_socket_id(lcore_id);
+		else
+			socketid = 0;
+
+		if (socketid >= NB_SOCKETS) {
+			rte_exit(EXIT_FAILURE, "Socket %d of lcore %u is "
+					"out of range %d\n", socketid,
+						lcore_id, NB_SOCKETS);
+		}
+		if (pktmbuf_pool[socketid] == NULL) {
+			rte_snprintf(s, sizeof(s), "mbuf_pool_%d", socketid);
+			pktmbuf_pool[socketid] =
+				rte_mempool_create(s, nb_mbuf,
+					MBUF_SIZE, MEMPOOL_CACHE_SIZE,
+					sizeof(struct rte_pktmbuf_pool_private),
+					rte_pktmbuf_pool_init, NULL,
+					rte_pktmbuf_init, NULL,
+					socketid, 0);
+			if (pktmbuf_pool[socketid] == NULL)
+				rte_exit(EXIT_FAILURE,
+					"Cannot init mbuf pool on socket %d\n",
+								socketid);
+			else
+				printf("Allocated mbuf pool on socket %d\n",
+								socketid);
+
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_LPM)
+			setup_lpm(socketid);
+#else
+			setup_hash(socketid);
+#endif
+		}
+		qconf = &lcore_conf[lcore_id];
+		qconf->ipv4_lookup_struct = ipv4_l3fwd_lookup_struct[socketid];
+#if (APP_LOOKUP_METHOD == APP_LOOKUP_EXACT_MATCH)
+		qconf->ipv6_lookup_struct = ipv6_l3fwd_lookup_struct[socketid];
+#endif
+	}
+	return 0;
+}
+
+/* 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_conf *qconf;
+	int ret;
+	unsigned nb_ports;
+	uint16_t queueid;
+	unsigned lcore_id;
+	uint64_t hz;
+	uint32_t n_tx_queue, nb_lcores;
+	uint8_t portid, nb_rx_queue, queue, socketid;
+
+	/* catch SIGINT and restore cpufreq governor to ondemand */
+	signal(SIGINT, signal_exit_now);
+
+	/* init EAL */
+	ret = rte_eal_init(argc, argv);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Invalid EAL parameters\n");
+	argc -= ret;
+	argv += ret;
+
+	/* init RTE timer library to be used late */
+	rte_timer_subsystem_init();
+
+	/* parse application arguments (after the EAL ones) */
+	ret = parse_args(argc, argv);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Invalid L3FWD parameters\n");
+
+	if (check_lcore_params() < 0)
+		rte_exit(EXIT_FAILURE, "check_lcore_params failed\n");
+
+	ret = init_lcore_rx_queues();
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "init_lcore_rx_queues failed\n");
+
+
+	/* init driver(s) */
+	if (rte_pmd_init_all() < 0)
+		rte_exit(EXIT_FAILURE, "Cannot init pmd\n");
+
+	if (rte_eal_pci_probe() < 0)
+		rte_exit(EXIT_FAILURE, "Cannot probe PCI\n");
+
+	nb_ports = rte_eth_dev_count();
+	if (nb_ports > RTE_MAX_ETHPORTS)
+		nb_ports = RTE_MAX_ETHPORTS;
+
+	if (check_port_config(nb_ports) < 0)
+		rte_exit(EXIT_FAILURE, "check_port_config failed\n");
+
+	nb_lcores = rte_lcore_count();
+
+	/* 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);
+			continue;
+		}
+
+		/* init port */
+		printf("Initializing port %d ... ", portid );
+		fflush(stdout);
+
+		nb_rx_queue = get_port_n_rx_queues(portid);
+		n_tx_queue = nb_lcores;
+		if (n_tx_queue > MAX_TX_QUEUE_PER_PORT)
+			n_tx_queue = MAX_TX_QUEUE_PER_PORT;
+		printf("Creating queues: nb_rxq=%d nb_txq=%u... ",
+			nb_rx_queue, (unsigned)n_tx_queue );
+		ret = rte_eth_dev_configure(portid, nb_rx_queue,
+					(uint16_t)n_tx_queue, &port_conf);
+		if (ret < 0)
+			rte_exit(EXIT_FAILURE, "Cannot configure device: "
+					"err=%d, port=%d\n", ret, portid);
+
+		rte_eth_macaddr_get(portid, &ports_eth_addr[portid]);
+		print_ethaddr(" Address:", &ports_eth_addr[portid]);
+		printf(", ");
+
+		/* init memory */
+		ret = init_mem(NB_MBUF);
+		if (ret < 0)
+			rte_exit(EXIT_FAILURE, "init_mem failed\n");
+
+		/* init one TX queue per couple (lcore,port) */
+		queueid = 0;
+		for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
+			if (rte_lcore_is_enabled(lcore_id) == 0)
+				continue;
+
+			if (numa_on)
+				socketid = \
+				(uint8_t)rte_lcore_to_socket_id(lcore_id);
+			else
+				socketid = 0;
+
+			printf("txq=%u,%d,%d ", lcore_id, queueid, socketid);
+			fflush(stdout);
+			ret = rte_eth_tx_queue_setup(portid, queueid, nb_txd,
+						     socketid, &tx_conf);
+			if (ret < 0)
+				rte_exit(EXIT_FAILURE,
+					"rte_eth_tx_queue_setup: err=%d, "
+						"port=%d\n", ret, portid);
+
+			qconf = &lcore_conf[lcore_id];
+			qconf->tx_queue_id[portid] = queueid;
+			queueid++;
+		}
+		printf("\n");
+	}
+
+	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
+		if (rte_lcore_is_enabled(lcore_id) == 0)
+			continue;
+
+		/* init power management library */
+		ret = rte_power_init(lcore_id);
+		if (ret)
+			rte_exit(EXIT_FAILURE, "Power management library "
+				"initialization failed on core%u\n", lcore_id);
+
+		/* init timer structures for each enabled lcore */
+		rte_timer_init(&power_timers[lcore_id]);
+		hz = rte_get_timer_hz();
+		rte_timer_reset(&power_timers[lcore_id],
+			hz/TIMER_NUMBER_PER_SECOND, SINGLE, lcore_id,
+						power_timer_cb, NULL);
+
+		qconf = &lcore_conf[lcore_id];
+		printf("\nInitializing rx queues on lcore %u ... ", lcore_id );
+		fflush(stdout);
+		/* init RX queues */
+		for(queue = 0; queue < qconf->n_rx_queue; ++queue) {
+			portid = qconf->rx_queue_list[queue].port_id;
+			queueid = qconf->rx_queue_list[queue].queue_id;
+
+			if (numa_on)
+				socketid = \
+				(uint8_t)rte_lcore_to_socket_id(lcore_id);
+			else
+				socketid = 0;
+
+			printf("rxq=%d,%d,%d ", portid, queueid, socketid);
+			fflush(stdout);
+
+			ret = rte_eth_rx_queue_setup(portid, queueid, nb_rxd,
+				socketid, &rx_conf, pktmbuf_pool[socketid]);
+			if (ret < 0)
+				rte_exit(EXIT_FAILURE,
+					"rte_eth_rx_queue_setup: err=%d, "
+						"port=%d\n", ret, portid);
+		}
+	}
+
+	printf("\n");
+
+	/* start ports */
+	for (portid = 0; portid < nb_ports; portid++) {
+		if ((enabled_port_mask & (1 << portid)) == 0) {
+			continue;
+		}
+		/* Start device */
+		ret = rte_eth_dev_start(portid);
+		if (ret < 0)
+			rte_exit(EXIT_FAILURE, "rte_eth_dev_start: err=%d, "
+						"port=%d\n", ret, portid);
+
+		/*
+		 * If enabled, put device in promiscuous mode.
+		 * This allows IO forwarding mode to forward packets
+		 * to itself through 2 cross-connected  ports of the
+		 * target machine.
+		 */
+		if (promiscuous_on)
+			rte_eth_promiscuous_enable(portid);
+	}
+
+	check_all_ports_link_status((uint8_t)nb_ports, enabled_port_mask);
+
+	/* launch per-lcore init on every lcore */
+	rte_eal_mp_remote_launch(main_loop, NULL, CALL_MASTER);
+	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
+		if (rte_eal_wait_lcore(lcore_id) < 0)
+			return -1;
+	}
+
+	return 0;
+}
diff --git a/examples/l3fwd-power/main.h b/examples/l3fwd-power/main.h
new file mode 100644
index 0000000000..d7ee4e4b93
--- /dev/null
+++ b/examples/l3fwd-power/main.h
@@ -0,0 +1,46 @@
+/*-
+ *   BSD LICENSE
+ * 
+ *   Copyright(c) 2010-2013 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 /* _MAIN_H_ */
diff --git a/lib/Makefile b/lib/Makefile
index c2594bd334..82ed571e97 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -46,6 +46,7 @@ DIRS-$(CONFIG_RTE_LIBRTE_IXGBE_PMD) += librte_pmd_ixgbe
 DIRS-$(CONFIG_RTE_LIBRTE_HASH) += librte_hash
 DIRS-$(CONFIG_RTE_LIBRTE_LPM) += librte_lpm
 DIRS-$(CONFIG_RTE_LIBRTE_NET) += librte_net
+DIRS-$(CONFIG_RTE_LIBRTE_POWER) += librte_power
 DIRS-$(CONFIG_RTE_LIBRTE_PMAC) += librte_pmac
 
 ifeq ($(CONFIG_RTE_EXEC_ENV_LINUXAPP),y)
diff --git a/lib/librte_eal/common/include/rte_log.h b/lib/librte_eal/common/include/rte_log.h
index 5f568c8177..5e886c09dc 100644
--- a/lib/librte_eal/common/include/rte_log.h
+++ b/lib/librte_eal/common/include/rte_log.h
@@ -72,6 +72,7 @@ extern struct rte_logs rte_logs;
 #define RTE_LOGTYPE_LPM     0x00000080 /**< Log related to LPM. */
 #define RTE_LOGTYPE_KNI     0X00000100 /**< Log related to KNI. */
 #define RTE_LOGTYPE_PMAC    0x00000200 /**< Log related to PMAC. */
+#define RTE_LOGTYPE_POWER   0x00000400 /**< Log related to power. */
 
 /* these log types can be used in an application */
 #define RTE_LOGTYPE_USER1   0x01000000 /**< User-defined log type 1. */
diff --git a/lib/librte_power/Makefile b/lib/librte_power/Makefile
new file mode 100644
index 0000000000..6986e029cd
--- /dev/null
+++ b/lib/librte_power/Makefile
@@ -0,0 +1,49 @@
+#   BSD LICENSE
+# 
+#   Copyright(c) 2010-2013 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 $(RTE_SDK)/mk/rte.vars.mk
+
+# library name
+LIB = librte_power.a
+
+CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR) -O3 -fno-strict-aliasing
+
+# all source are stored in SRCS-y
+SRCS-$(CONFIG_RTE_LIBRTE_POWER) := rte_power.c
+
+# install this header file
+SYMLINK-$(CONFIG_RTE_LIBRTE_POWER)-include := rte_power.h
+
+# this lib needs eal
+DEPDIRS-$(CONFIG_RTE_LIBRTE_POWER) += lib/librte_eal
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_power/rte_power.c b/lib/librte_power/rte_power.c
new file mode 100644
index 0000000000..8370b96fcf
--- /dev/null
+++ b/lib/librte_power/rte_power.c
@@ -0,0 +1,546 @@
+/*-
+ *   BSD LICENSE
+ * 
+ *   Copyright(c) 2010-2013 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 <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <limits.h>
+
+#include <rte_memcpy.h>
+#include <rte_atomic.h>
+
+#include "rte_power.h"
+
+#ifdef RTE_LIBRTE_POWER_DEBUG
+#define POWER_DEBUG_TRACE(fmt, args...) do { \
+		RTE_LOG(ERR, POWER, "%s: " fmt, __func__, ## args); \
+	} while (0) 
+#else
+#define POWER_DEBUG_TRACE(fmt, args...)
+#endif
+
+#define FOPEN_OR_ERR_RET(f, retval) do { \
+	if ((f) == NULL) { \
+		RTE_LOG(ERR, POWER, "File not openned\n"); \
+		return (retval); \
+	} \
+} while(0)
+
+#define FOPS_OR_NULL_GOTO(ret, label) do { \
+	if ((ret) == NULL) { \
+		RTE_LOG(ERR, POWER, "fgets returns nothing\n"); \
+		goto label; \
+	} \
+} while(0)
+
+#define FOPS_OR_ERR_GOTO(ret, label) do { \
+	if ((ret) < 0) { \
+		RTE_LOG(ERR, POWER, "File operations failed\n"); \
+		goto label; \
+	} \
+} while(0)
+
+#define STR_SIZE     1024
+#define POWER_CONVERT_TO_DECIMAL 10
+
+#define POWER_GOVERNOR_USERSPACE "userspace"
+#define POWER_SYSFILE_GOVERNOR   \
+	"/sys/devices/system/cpu/cpu%u/cpufreq/scaling_governor"
+#define POWER_SYSFILE_AVAIL_FREQ \
+	"/sys/devices/system/cpu/cpu%u/cpufreq/scaling_available_frequencies"
+#define POWER_SYSFILE_SETSPEED   \
+	"/sys/devices/system/cpu/cpu%u/cpufreq/scaling_setspeed"
+
+enum power_state {
+	POWER_IDLE = 0,
+	POWER_ONGOING,
+	POWER_USED,
+	POWER_UNKNOWN
+};
+
+/**
+ * Power info per lcore.
+ */
+struct rte_power_info {
+	unsigned lcore_id;                   /**< Logical core id */
+	uint32_t freqs[RTE_MAX_LCORE_FREQS]; /**< Frequency array */
+	uint32_t nb_freqs;                   /**< number of available freqs */
+	FILE *f;                             /**< FD of scaling_setspeed */
+	char governor_ori[32];               /**< Original governor name */
+	uint32_t curr_idx;                   /**< Freq index in freqs array */
+	volatile uint32_t state;             /**< Power in use state */
+} __rte_cache_aligned;
+
+static struct rte_power_info lcore_power_info[RTE_MAX_LCORE];
+
+/**
+ * It is to set specific freq for specific logical core, according to the index
+ * of supported frequencies.
+ */
+static int
+set_freq_internal(struct rte_power_info *pi, uint32_t idx)
+{
+	if (idx >= RTE_MAX_LCORE_FREQS || idx >= pi->nb_freqs) {
+		RTE_LOG(ERR, POWER, "Invalid frequency index %u, which "
+			"should be less than %u\n", idx, pi->nb_freqs);
+		return -1;
+	}
+
+	/* Check if it is the same as current */
+	if (idx == pi->curr_idx)
+		return 0;
+
+	POWER_DEBUG_TRACE("Freqency[%u] %u to be set for lcore %u\n",
+				idx, pi->freqs[idx], pi->lcore_id);
+	if (fseek(pi->f, 0, SEEK_SET) < 0) {
+		RTE_LOG(ERR, POWER, "Fail to set file position indicator to 0 "
+			"for setting frequency for lcore %u\n", pi->lcore_id);
+		return -1;
+	}
+	if (fprintf(pi->f, "%u", pi->freqs[idx]) < 0) {
+		RTE_LOG(ERR, POWER, "Fail to write new frequency for "
+					"lcore %u\n", pi->lcore_id);
+		return -1;
+	}
+	fflush(pi->f);
+	pi->curr_idx = idx;
+
+	return 1;
+}
+
+/**
+ * It is to check the current scaling governor by reading sys file, and then
+ * set it into 'userspace' if it is not by writing the sys file. The original
+ * governor will be saved for rolling back.
+ */
+static int
+power_set_governor_userspace(struct rte_power_info *pi)
+{
+	FILE *f;
+	int ret = -1;
+	char buf[BUFSIZ];
+	char fullpath[PATH_MAX];
+	char *s;
+	int val;
+
+	rte_snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
+							pi->lcore_id);
+	f = fopen(fullpath, "rw+");
+	FOPEN_OR_ERR_RET(f, ret);
+
+	s = fgets(buf, sizeof(buf), f);
+	FOPS_OR_NULL_GOTO(s, out);
+
+	/* Check if current governor is userspace */
+	if (strncmp(buf, POWER_GOVERNOR_USERSPACE,
+		sizeof(POWER_GOVERNOR_USERSPACE)) == 0) {
+		ret = 0;
+		POWER_DEBUG_TRACE("Power management governor of lcore %u is "
+					"already userspace\n", pi->lcore_id);
+		goto out;
+	}
+	/* Save the original governor */
+	rte_snprintf(pi->governor_ori, sizeof(pi->governor_ori), "%s", buf);
+
+	/* Write 'userspace' to the governor */
+	val = fseek(f, 0, SEEK_SET);
+	FOPS_OR_ERR_GOTO(val, out);
+
+	val = fputs(POWER_GOVERNOR_USERSPACE, f);
+	FOPS_OR_ERR_GOTO(val, out);
+
+	ret = 0;
+	RTE_LOG(INFO, POWER, "Power management governor of lcore %u has been "
+			"set to user space successfully\n", pi->lcore_id);
+out:
+	fclose(f);
+
+	return ret;
+}
+
+/**
+ * It is to get the available frequencies of the specific lcore by reading the
+ * sys file.
+ */
+static int
+power_get_available_freqs(struct rte_power_info *pi)
+{
+	FILE *f;
+	int ret = -1, i, count;
+	char *p;
+	char buf[BUFSIZ];
+	char fullpath[PATH_MAX];
+	char *freqs[RTE_MAX_LCORE_FREQS];
+	char *s;
+
+	rte_snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_AVAIL_FREQ,
+								pi->lcore_id);
+	f = fopen(fullpath, "r");
+	FOPEN_OR_ERR_RET(f, ret);
+
+	s = fgets(buf, sizeof(buf), f);
+	FOPS_OR_NULL_GOTO(s, out);
+
+	/* Strip the line break if there is */
+	p = strchr(buf, '\n');
+	if (p != NULL)
+		*p = 0;
+
+	/* Split string into at most RTE_MAX_LCORE_FREQS frequencies */
+	count = rte_strsplit(buf, sizeof(buf), freqs,
+				RTE_MAX_LCORE_FREQS, ' ');
+	if (count <= 0) {
+		RTE_LOG(ERR, POWER, "No available frequency in "
+			""POWER_SYSFILE_AVAIL_FREQ"\n", pi->lcore_id);
+		goto out;
+	}
+	if (count >= RTE_MAX_LCORE_FREQS) {
+		RTE_LOG(ERR, POWER, "Too many available frequencies : %d\n",
+								count);
+		goto out;
+	}
+
+	/* Store the available frequncies into power context */
+	for (i = 0, pi->nb_freqs = 0; i < count; i++) {
+		POWER_DEBUG_TRACE("Lcore %u frequency[%d]: %s\n", pi->lcore_id,
+								i, freqs[i]);
+		pi->freqs[pi->nb_freqs++] = strtoul(freqs[i], &p,
+					POWER_CONVERT_TO_DECIMAL);
+	}
+
+	ret = 0;
+	POWER_DEBUG_TRACE("%d frequencie(s) of lcore %u are available\n",
+						count, pi->lcore_id);
+out:
+	fclose(f);
+
+	return ret;
+}
+
+/**
+ * It is to fopen the sys file for the future setting the lcore frequency.
+ */
+static int
+power_init_for_setting_freq(struct rte_power_info *pi)
+{
+	FILE *f;
+	char fullpath[PATH_MAX];
+	char buf[BUFSIZ];
+	uint32_t i, freq;
+	char *s;
+
+	rte_snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_SETSPEED,
+							pi->lcore_id);
+	f = fopen(fullpath, "rw+");
+	FOPEN_OR_ERR_RET(f, -1);
+
+	s = fgets(buf, sizeof(buf), f);
+	FOPS_OR_NULL_GOTO(s, out);
+
+	freq = strtoul(buf, NULL, POWER_CONVERT_TO_DECIMAL);
+	for (i = 0; i < pi->nb_freqs; i++) {
+		if (freq == pi->freqs[i]) {
+			pi->curr_idx = i;
+			pi->f = f;
+			return 0;
+		}
+	}
+
+out:
+	fclose(f);
+
+	return -1;
+}
+
+int
+rte_power_init(unsigned lcore_id)
+{
+	struct rte_power_info *pi;
+
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
+					lcore_id, RTE_MAX_LCORE - 1U);
+		return -1;
+	}
+
+	pi = &lcore_power_info[lcore_id];
+	if (rte_atomic32_cmpset(&(pi->state), POWER_IDLE, POWER_ONGOING)
+								== 0) {
+		RTE_LOG(INFO, POWER, "Power management of lcore %u is "
+						"in use\n", lcore_id);
+		return -1;
+	}
+
+	pi->lcore_id = lcore_id;
+	/* Check and set the governor */
+	if (power_set_governor_userspace(pi) < 0) {
+		RTE_LOG(ERR, POWER, "Cannot set governor of lcore %u to "
+						"userspace\n", lcore_id);
+		goto fail;
+	}
+
+	/* Get the available frequencies */
+	if (power_get_available_freqs(pi) < 0) {
+		RTE_LOG(ERR, POWER, "Cannot get available frequencies of "
+						"lcore %u\n", lcore_id);
+		goto fail;
+	}
+
+	/* Init for setting lcore frequency */
+	if (power_init_for_setting_freq(pi) < 0) {
+		RTE_LOG(ERR, POWER, "Cannot init for setting frequency for "
+						"lcore %u\n", lcore_id);
+		goto fail;
+	}
+
+	/* Set freq to max by default */
+	if (rte_power_freq_max(lcore_id) < 0) {
+		RTE_LOG(ERR, POWER, "Cannot set frequency of lcore %u "
+						"to max\n", lcore_id);
+		goto fail;
+	}
+
+	RTE_LOG(INFO, POWER, "Initialized successfully for lcore %u "
+					"power manamgement\n", lcore_id);
+	rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_USED);
+
+	return 0;
+
+fail:
+	rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_UNKNOWN);
+
+	return -1;
+}
+
+/**
+ * It is to check the governor and then set the original governor back if
+ * needed by writing the the sys file.
+ */
+static int
+power_set_governor_original(struct rte_power_info *pi)
+{
+	FILE *f;
+	int ret = -1;
+	char buf[BUFSIZ];
+	char fullpath[PATH_MAX];
+	char *s;
+	int val;
+
+	rte_snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
+							pi->lcore_id);
+	f = fopen(fullpath, "rw+");
+	FOPEN_OR_ERR_RET(f, ret);
+
+	s = fgets(buf, sizeof(buf), f);
+	FOPS_OR_NULL_GOTO(s, out);
+
+	/* Check if the governor to be set is the same as current */
+	if (strncmp(buf, pi->governor_ori, sizeof(pi->governor_ori)) == 0) {
+		ret = 0;
+		POWER_DEBUG_TRACE("Power management governor of lcore %u "
+					"has already been set to %s\n",
+					pi->lcore_id, pi->governor_ori);
+		goto out;
+	}
+
+	/* Write back the original governor */
+	val = fseek(f, 0, SEEK_SET);
+	FOPS_OR_ERR_GOTO(val, out);
+
+	val = fputs(pi->governor_ori, f);
+	FOPS_OR_ERR_GOTO(val, out);
+
+	ret = 0;
+	RTE_LOG(INFO, POWER, "Power manamgement governor of lcore %u "
+				"has been set back to %s successfully\n",
+					pi->lcore_id, pi->governor_ori);
+out:
+	fclose(f);
+
+	return ret;
+}
+
+int
+rte_power_exit(unsigned lcore_id)
+{
+	struct rte_power_info *pi;
+
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
+					lcore_id, RTE_MAX_LCORE - 1U);
+		return -1;
+	}
+	pi = &lcore_power_info[lcore_id];
+	if (rte_atomic32_cmpset(&(pi->state), POWER_USED, POWER_ONGOING)
+								== 0) {
+		RTE_LOG(INFO, POWER, "Power management of lcore %u is "
+						"not used\n", lcore_id);
+		return -1;
+	}
+
+	/* Close FD of setting freq */
+	fclose(pi->f);
+	pi->f = NULL;
+
+	/* Set the governor back to the original */
+	if (power_set_governor_original(pi) < 0) {
+		RTE_LOG(ERR, POWER, "Cannot set the governor of %u back "
+					"to the original\n", lcore_id);
+		goto fail;
+	}
+
+	RTE_LOG(INFO, POWER, "Power management of lcore %u has exited from "
+				"'userspace' mode and been set back to the "
+						"original\n", lcore_id);
+	rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_IDLE);
+
+	return 0;
+
+fail:
+	rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_UNKNOWN);
+
+	return -1;
+}
+ 
+uint32_t
+rte_power_freqs(unsigned lcore_id, uint32_t *freqs, uint32_t num)
+{
+	struct rte_power_info *pi;
+
+	if (lcore_id >= RTE_MAX_LCORE || !freqs) {
+		RTE_LOG(ERR, POWER, "Invalid input parameter\n");
+		return 0;
+	}
+
+	pi = &lcore_power_info[lcore_id];
+	if (num < pi->nb_freqs) {
+		RTE_LOG(ERR, POWER, "Buffer size is not enough\n");
+		return 0;
+	}
+	rte_memcpy(freqs, pi->freqs, pi->nb_freqs * sizeof(uint32_t));
+
+	return pi->nb_freqs;
+}
+ 
+uint32_t
+rte_power_get_freq(unsigned lcore_id)
+{
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+		return RTE_POWER_INVALID_FREQ_INDEX;
+	}
+
+	return lcore_power_info[lcore_id].curr_idx;
+}
+
+int
+rte_power_set_freq(unsigned lcore_id, uint32_t index)
+{
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+		return -1;
+	}
+
+	return set_freq_internal(&(lcore_power_info[lcore_id]), index);
+}
+ 
+int
+rte_power_freq_down(unsigned lcore_id)
+{
+	struct rte_power_info *pi;
+
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+		return -1;
+	}
+
+	pi = &lcore_power_info[lcore_id];
+	if (pi->curr_idx + 1 == pi->nb_freqs)
+		return 0;
+
+	/* Frequencies in the array are from high to low. */
+	return set_freq_internal(pi, pi->curr_idx + 1);
+}
+ 
+int
+rte_power_freq_up(unsigned lcore_id)
+{
+	struct rte_power_info *pi;
+
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+		return -1;
+	}
+
+	pi = &lcore_power_info[lcore_id];
+	if (pi->curr_idx == 0)
+		return 0;
+
+	/* Frequencies in the array are from high to low. */
+	return set_freq_internal(pi, pi->curr_idx - 1);
+}
+ 
+int
+rte_power_freq_max(unsigned lcore_id)
+{
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+		return -1;
+	}
+
+	/* Frequencies in the array are from high to low. */
+	return set_freq_internal(&lcore_power_info[lcore_id], 0);
+}
+ 
+int
+rte_power_freq_min(unsigned lcore_id)
+{
+	struct rte_power_info *pi;
+
+	if (lcore_id >= RTE_MAX_LCORE) {
+		RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
+		return -1;
+	}
+
+	pi = &lcore_power_info[lcore_id];
+
+	/* Frequencies in the array are from high to low. */
+	return set_freq_internal(pi, pi->nb_freqs - 1);
+}
+
diff --git a/lib/librte_power/rte_power.h b/lib/librte_power/rte_power.h
new file mode 100644
index 0000000000..16f9bc2658
--- /dev/null
+++ b/lib/librte_power/rte_power.h
@@ -0,0 +1,194 @@
+/*-
+ *   BSD LICENSE
+ * 
+ *   Copyright(c) 2010-2013 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 _RTE_POWER_H
+#define _RTE_POWER_H
+
+/**
+ * @file
+ * RTE Power Management 
+ */
+
+#include <rte_common.h>
+#include <rte_byteorder.h>
+#include <rte_log.h>
+#include <rte_string_fns.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RTE_POWER_INVALID_FREQ_INDEX (~0)
+
+/** 
+ * Initialize power management for a specific lcore. It will check and set the
+ * governor to userspace for the lcore, get the available frequencies, and
+ * prepare to set new lcore frequency.
+ *
+ * @param lcore_id
+ *  lcore id.
+ *
+ * @return 
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int rte_power_init(unsigned lcore_id);
+
+/**
+ * Exit power management on a specific lcore. It will set the governor to which
+ * is before initialized.
+ *
+ * @param lcore_id
+ *  lcore id.
+ *
+ * @return 
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int rte_power_exit(unsigned lcore_id);
+
+/** 
+ * Get the available frequencies of a specific lcore. The return value will be
+ * the minimal one of the total number of available frequencies and the number
+ * of buffer. The index of available frequencies used in other interfaces
+ * should be in the range of 0 to this return value.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ *  lcore id.
+ * @param freqs
+ *  The buffer array to save the frequencies.
+ * @param num
+ *  The number of frequencies to get.
+ *
+ * @return
+ *  The number of available frequencies.
+ */
+uint32_t rte_power_freqs(unsigned lcore_id, uint32_t *freqs, uint32_t num);
+
+/** 
+ * Return the current index of available frequencies of a specific lcore. It
+ * will return 'RTE_POWER_INVALID_FREQ_INDEX = (~0)' if error.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ *  lcore id.
+ *
+ * @return 
+ *  The current index of available frequencies.
+ */
+uint32_t rte_power_get_freq(unsigned lcore_id);
+
+/** 
+ * Set the new frequency for a specific lcore by indicating the index of
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ *  lcore id.
+ * @param index
+ *  The index of available frequencies.
+ *
+ * @return
+ *  - 1 on success with frequency changed.
+ *  - 0 on success without frequency chnaged.
+ *  - Negative on error.
+ */
+int rte_power_set_freq(unsigned lcore_id, uint32_t index);
+
+/** 
+ * Scale up the frequency of a specific lcore according to the available
+ * frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ *  lcore id.
+ *
+ * @return
+ *  - 1 on success with frequency changed.
+ *  - 0 on success without frequency chnaged.
+ *  - Negative on error.
+ */
+int rte_power_freq_up(unsigned lcore_id);
+
+/** 
+ * Scale down the frequency of a specific lcore according to the available
+ * frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ *  lcore id.
+ *
+ * @return
+ *  - 1 on success with frequency changed.
+ *  - 0 on success without frequency chnaged.
+ *  - Negative on error.
+ */
+int rte_power_freq_down(unsigned lcore_id); 
+
+/** 
+ * Scale up the frequency of a specific lcore to the highest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ *  lcore id.
+ *
+ * @return
+ *  - 1 on success with frequency changed.
+ *  - 0 on success without frequency chnaged.
+ *  - Negative on error.
+ */
+int rte_power_freq_max(unsigned lcore_id);
+
+/** 
+ * Scale down the frequency of a specific lcore to the lowest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ *  lcore id.
+ *
+ * @return
+ *  - 1 on success with frequency changed.
+ *  - 0 on success without frequency chnaged.
+ *  - Negative on error.
+ */
+int rte_power_freq_min(unsigned lcore_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index b192a92139..f8f265741d 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -93,6 +93,10 @@ ifeq ($(CONFIG_RTE_LIBRTE_LPM),y)
 LDLIBS += -lrte_lpm
 endif
 
+ifeq ($(CONFIG_RTE_LIBRTE_POWER),y)
+LDLIBS += -lrte_power
+endif
+
 ifeq ($(CONFIG_RTE_LIBRTE_PMAC),y)
 LDLIBS += -lrte_pmac
 endif