[dpdk-dev] [PATCH v2 2/3] rte_ctrl_if: add control interface library

[Ferruh Yigit <ferruh.yigit@intel.com>]

This library gets control messages form kernelspace and forwards them to
librte_ether and returns response back to the kernelspace.

Library does:
1) Trigger Linux virtual interface creation
2) Initialize the netlink socket communication
3) Provides process() API to the application that does processing the
received messages

This library requires corresponding kernel module to be inserted.

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>

---

v2:
* User rtnetlink to create interfaces.
* Add more ethtool support: get/set ringparam, set pauseparam.
* return defined error instead of hardcoded value
---
 MAINTAINERS                                |   1 +
 config/common_linuxapp                     |   3 +-
 doc/api/doxy-api-index.md                  |   3 +-
 doc/api/doxy-api.conf                      |   1 +
 doc/guides/rel_notes/release_16_04.rst     |   9 +
 lib/Makefile                               |   3 +-
 lib/librte_ctrl_if/Makefile                |  58 ++++
 lib/librte_ctrl_if/rte_ctrl_if.c           | 385 ++++++++++++++++++++++++
 lib/librte_ctrl_if/rte_ctrl_if.h           | 115 ++++++++
 lib/librte_ctrl_if/rte_ctrl_if_version.map |   9 +
 lib/librte_ctrl_if/rte_ethtool.c           | 450 +++++++++++++++++++++++++++++
 lib/librte_ctrl_if/rte_ethtool.h           |  54 ++++
 lib/librte_ctrl_if/rte_nl.c                | 274 ++++++++++++++++++
 lib/librte_ctrl_if/rte_nl.h                |  49 ++++
 lib/librte_eal/common/include/rte_log.h    |   3 +-
 mk/rte.app.mk                              |   3 +-
 16 files changed, 1415 insertions(+), 5 deletions(-)
 create mode 100644 lib/librte_ctrl_if/Makefile
 create mode 100644 lib/librte_ctrl_if/rte_ctrl_if.c
 create mode 100644 lib/librte_ctrl_if/rte_ctrl_if.h
 create mode 100644 lib/librte_ctrl_if/rte_ctrl_if_version.map
 create mode 100644 lib/librte_ctrl_if/rte_ethtool.c
 create mode 100644 lib/librte_ctrl_if/rte_ethtool.h
 create mode 100644 lib/librte_ctrl_if/rte_nl.c
 create mode 100644 lib/librte_ctrl_if/rte_nl.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 09c56c7..91c98bc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -256,6 +256,7 @@ F: doc/guides/sample_app_ug/kernel_nic_interface.rst
 Linux KCP
 M: Ferruh Yigit <ferruh.yigit@intel.com>
 F: lib/librte_eal/linuxapp/kcp/
+F: lib/librte_ctrl_if/
 
 Linux AF_PACKET
 M: John W. Linville <linville@tuxdriver.com>
diff --git a/config/common_linuxapp b/config/common_linuxapp
index 2f4eb1d..4bcd508 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -1,6 +1,6 @@
 #   BSD LICENSE
 #
-#   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+#   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
 #   All rights reserved.
 #
 #   Redistribution and use in source and binary forms, with or without
@@ -501,6 +501,7 @@ CONFIG_RTE_KNI_VHOST_DEBUG_TX=n
 #
 CONFIG_RTE_KCP_KMOD=y
 CONFIG_RTE_KCP_KO_DEBUG=n
+CONFIG_RTE_LIBRTE_CTRL_IF=y
 
 #
 # Compile vhost library
diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index 7a91001..214d16e 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -149,4 +149,5 @@ There are many libraries, so their headers may be grouped by topics:
   [common]             (@ref rte_common.h),
   [ABI compat]         (@ref rte_compat.h),
   [keepalive]          (@ref rte_keepalive.h),
-  [version]            (@ref rte_version.h)
+  [version]            (@ref rte_version.h),
+  [control interface]  (@ref rte_ctrl_if.h)
diff --git a/doc/api/doxy-api.conf b/doc/api/doxy-api.conf
index 57e8b5d..fd69bf1 100644
--- a/doc/api/doxy-api.conf
+++ b/doc/api/doxy-api.conf
@@ -39,6 +39,7 @@ INPUT                   = doc/api/doxy-api-index.md \
                           lib/librte_cmdline \
                           lib/librte_compat \
                           lib/librte_cryptodev \
+                          lib/librte_ctrl_if \
                           lib/librte_distributor \
                           lib/librte_ether \
                           lib/librte_hash \
diff --git a/doc/guides/rel_notes/release_16_04.rst b/doc/guides/rel_notes/release_16_04.rst
index 27fc624..1b1d34c 100644
--- a/doc/guides/rel_notes/release_16_04.rst
+++ b/doc/guides/rel_notes/release_16_04.rst
@@ -39,6 +39,14 @@ This section should contain new features added in this release. Sample format:
 
   Enabled virtio 1.0 support for virtio pmd driver.
 
+* **Control interface support added.**
+
+  To enable controlling DPDK ports by common Linux tools.
+  Following modules added to DPDK:
+
+  * librte_ctrl_if library
+  * librte_eal/linuxapp/kcp kernel module
+
 
 Resolved Issues
 ---------------
@@ -113,6 +121,7 @@ The libraries prepended with a plus sign were incremented in this version.
      librte_acl.so.2
      librte_cfgfile.so.2
      librte_cmdline.so.1
+   + librte_ctrl_if.so.1
      librte_distributor.so.1
      librte_eal.so.2
      librte_hash.so.2
diff --git a/lib/Makefile b/lib/Makefile
index ef172ea..a50bc1e 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -1,6 +1,6 @@
 #   BSD LICENSE
 #
-#   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+#   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
 #   All rights reserved.
 #
 #   Redistribution and use in source and binary forms, with or without
@@ -58,6 +58,7 @@ DIRS-$(CONFIG_RTE_LIBRTE_PORT) += librte_port
 DIRS-$(CONFIG_RTE_LIBRTE_TABLE) += librte_table
 DIRS-$(CONFIG_RTE_LIBRTE_PIPELINE) += librte_pipeline
 DIRS-$(CONFIG_RTE_LIBRTE_REORDER) += librte_reorder
+DIRS-$(CONFIG_RTE_LIBRTE_CTRL_IF) += librte_ctrl_if
 
 ifeq ($(CONFIG_RTE_EXEC_ENV_LINUXAPP),y)
 DIRS-$(CONFIG_RTE_LIBRTE_KNI) += librte_kni
diff --git a/lib/librte_ctrl_if/Makefile b/lib/librte_ctrl_if/Makefile
new file mode 100644
index 0000000..4e82966
--- /dev/null
+++ b/lib/librte_ctrl_if/Makefile
@@ -0,0 +1,58 @@
+#   BSD LICENSE
+#
+#   Copyright(c) 2016 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_ctrl_if.a
+
+CFLAGS += -O3
+CFLAGS += $(WERROR_FLAGS)
+
+EXPORT_MAP := rte_ctrl_if_version.map
+
+LIBABIVER := 1
+
+SRCS-y += rte_ctrl_if.c
+SRCS-y += rte_nl.c
+SRCS-y += rte_ethtool.c
+
+#
+# Export include files
+#
+SYMLINK-y-include += rte_ctrl_if.h
+
+# this lib depends upon:
+DEPDIRS-y += lib/librte_ether
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_ctrl_if/rte_ctrl_if.c b/lib/librte_ctrl_if/rte_ctrl_if.c
new file mode 100644
index 0000000..d16398f
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_ctrl_if.c
@@ -0,0 +1,385 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 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 <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <rte_ethdev.h>
+#include "rte_ctrl_if.h"
+#include "rte_nl.h"
+
+#define NAMESZ 32
+#define IFNAME "dpdk"
+#define BUFSZ 1024
+
+static int kcp_rtnl_fd = -1;
+static int kcp_fd_ref;
+
+struct kcp_request {
+	struct nlmsghdr nlmsg;
+	char buf[BUFSZ];
+};
+
+static int
+conrol_interface_rtnl_init(void)
+{
+	struct sockaddr_nl src;
+	int ret;
+
+	kcp_rtnl_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+	if (kcp_rtnl_fd < 0) {
+		RTE_LOG(ERR, CTRL_IF, "socket for create failed.\n");
+		return -1;
+	}
+
+	memset(&src, 0, sizeof(struct sockaddr_nl));
+
+	src.nl_family = AF_NETLINK;
+	src.nl_pid = getpid();
+
+	ret = bind(kcp_rtnl_fd, (struct sockaddr *)&src,
+			sizeof(struct sockaddr_nl));
+	if (ret < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Bind for create failed.\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+control_interface_init(void)
+{
+	int ret;
+
+	ret = conrol_interface_rtnl_init();
+	if (ret < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Failed to initialize rtnetlink.\n");
+		return -1;
+	}
+
+	ret = control_interface_nl_init();
+	if (ret < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Failed to initialize netlink.\n");
+		close(kcp_rtnl_fd);
+		kcp_rtnl_fd = -1;
+	}
+
+	return ret;
+}
+
+static int
+control_interface_ref_get(void)
+{
+	int ret = 0;
+
+	if (kcp_fd_ref == 0)
+		ret = control_interface_init();
+
+	if (ret == 0)
+		kcp_fd_ref++;
+	else
+		RTE_LOG(ERR, CTRL_IF,
+				"Failed to initialize control interface.\n");
+
+	return kcp_fd_ref;
+}
+
+static void
+control_interface_release(void)
+{
+	close(kcp_rtnl_fd);
+	control_interface_nl_release();
+}
+
+static int
+control_interface_ref_put(void)
+{
+	if (kcp_fd_ref == 0)
+		return 0;
+
+	kcp_fd_ref--;
+
+	if (kcp_fd_ref == 0)
+		control_interface_release();
+
+	return kcp_fd_ref;
+}
+
+static int
+add_attr(struct kcp_request *req, unsigned short type, void *buf, size_t len)
+{
+	struct rtattr *rta;
+	int nlmsg_len;
+
+	nlmsg_len = NLMSG_ALIGN(req->nlmsg.nlmsg_len);
+	rta = (struct rtattr *)((char *)&req->nlmsg + nlmsg_len);
+	if (nlmsg_len + RTA_LENGTH(len) > sizeof(struct kcp_request))
+		return -1;
+	rta->rta_type = type;
+	rta->rta_len = RTA_LENGTH(len);
+	memcpy(RTA_DATA(rta), buf, len);
+	req->nlmsg.nlmsg_len = nlmsg_len + RTA_LENGTH(len);
+
+	return 0;
+}
+
+static struct
+rtattr *add_attr_nested(struct kcp_request *req, unsigned short type)
+{
+	struct rtattr *rta;
+	int nlmsg_len;
+
+	nlmsg_len = NLMSG_ALIGN(req->nlmsg.nlmsg_len);
+	rta = (struct rtattr *)((char *)&req->nlmsg + nlmsg_len);
+	if (nlmsg_len + RTA_LENGTH(0) > sizeof(struct kcp_request))
+		return NULL;
+	rta->rta_type = type;
+	rta->rta_len = nlmsg_len;
+	req->nlmsg.nlmsg_len = nlmsg_len + RTA_LENGTH(0);
+
+	return rta;
+}
+
+static void
+end_attr_nested(struct kcp_request *req, struct rtattr *rta)
+{
+	rta->rta_len = req->nlmsg.nlmsg_len - rta->rta_len;
+}
+
+static int
+rte_eth_rtnl_create(uint8_t port_id)
+{
+	struct kcp_request req;
+	struct ifinfomsg *info;
+	struct rtattr *rta1;
+	struct rtattr *rta2;
+	unsigned int pid = getpid();
+	char name[NAMESZ];
+	char type[NAMESZ];
+	struct iovec iov;
+	struct msghdr msg;
+	struct sockaddr_nl nladdr;
+	int ret;
+	char buf[BUFSZ];
+
+	memset(&req, 0, sizeof(struct kcp_request));
+
+	req.nlmsg.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req.nlmsg.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
+	req.nlmsg.nlmsg_flags |= NLM_F_ACK;
+	req.nlmsg.nlmsg_type = RTM_NEWLINK;
+
+	info = NLMSG_DATA(&req.nlmsg);
+
+	info->ifi_family = AF_UNSPEC;
+	info->ifi_index = 0;
+
+	snprintf(name, NAMESZ, IFNAME"%u", port_id);
+	ret = add_attr(&req, IFLA_IFNAME, name, strlen(name) + 1);
+	if (ret < 0)
+		return -1;
+
+	rta1 = add_attr_nested(&req, IFLA_LINKINFO);
+	if (rta1 == NULL)
+		return -1;
+
+	snprintf(type, NAMESZ, KCP_DEVICE);
+	ret = add_attr(&req, IFLA_INFO_KIND, type, strlen(type) + 1);
+	if (ret < 0)
+		return -1;
+
+	rta2 = add_attr_nested(&req, IFLA_INFO_DATA);
+	if (rta2 == NULL)
+		return -1;
+
+	ret = add_attr(&req, IFLA_KCP_PORTID, &port_id, sizeof(uint8_t));
+	if (ret < 0)
+		return -1;
+
+	ret = add_attr(&req, IFLA_KCP_PID, &pid, sizeof(unsigned int));
+	if (ret < 0)
+		return -1;
+
+	end_attr_nested(&req, rta2);
+	end_attr_nested(&req, rta1);
+
+	memset(&nladdr, 0, sizeof(nladdr));
+	nladdr.nl_family = AF_NETLINK;
+
+	iov.iov_base = (void *)&req.nlmsg;
+	iov.iov_len = req.nlmsg.nlmsg_len;
+
+	memset(&msg, 0, sizeof(struct msghdr));
+	msg.msg_name = &nladdr;
+	msg.msg_namelen = sizeof(nladdr);
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	ret = sendmsg(kcp_rtnl_fd, &msg, 0);
+	if (ret < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Send for create failed %d.\n", errno);
+		return -1;
+	}
+
+	memset(buf, 0, sizeof(buf));
+	iov.iov_base = buf;
+	iov.iov_len = sizeof(buf);
+
+	ret = recvmsg(kcp_rtnl_fd, &msg, 0);
+	if (ret < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Recv for create failed.\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+rte_eth_control_interface_create_one(uint8_t port_id)
+{
+	int ret;
+
+	if (control_interface_ref_get() != 0) {
+		ret = rte_eth_rtnl_create(port_id);
+		RTE_LOG(DEBUG, CTRL_IF,
+			"Control interface %s for port:%u\n",
+			ret < 0 ? "failed" : "created", port_id);
+	}
+
+	return 0;
+}
+
+int
+rte_eth_control_interface_create(void)
+{
+	int i;
+	int ret = 0;
+
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+		if (rte_eth_dev_is_valid_port(i)) {
+			ret = rte_eth_control_interface_create_one(i);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	return ret;
+}
+
+static int
+rte_eth_rtnl_destroy(uint8_t port_id)
+{
+	struct kcp_request req;
+	struct ifinfomsg *info;
+	char name[NAMESZ];
+	struct iovec iov;
+	struct msghdr msg;
+	struct sockaddr_nl nladdr;
+	int ret;
+
+	memset(&req, 0, sizeof(struct kcp_request));
+
+	req.nlmsg.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req.nlmsg.nlmsg_flags = NLM_F_REQUEST;
+	req.nlmsg.nlmsg_type = RTM_DELLINK;
+
+	info = NLMSG_DATA(&req.nlmsg);
+
+	info->ifi_family = AF_UNSPEC;
+	info->ifi_index = 0;
+
+	snprintf(name, NAMESZ, IFNAME"%u", port_id);
+	ret = add_attr(&req, IFLA_IFNAME, name, strlen(name) + 1);
+	if (ret < 0)
+		return -1;
+
+	memset(&nladdr, 0, sizeof(nladdr));
+	nladdr.nl_family = AF_NETLINK;
+
+	iov.iov_base = (void *)&req.nlmsg;
+	iov.iov_len = req.nlmsg.nlmsg_len;
+
+	memset(&msg, 0, sizeof(struct msghdr));
+	msg.msg_name = &nladdr;
+	msg.msg_namelen = sizeof(nladdr);
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	ret = sendmsg(kcp_rtnl_fd, &msg, 0);
+	if (ret < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Send for destroy failed.\n");
+		return -1;
+	}
+	return 0;
+}
+
+static int
+rte_eth_control_interface_destroy_one(uint8_t port_id)
+{
+	rte_eth_rtnl_destroy(port_id);
+	control_interface_ref_put();
+	RTE_LOG(DEBUG, CTRL_IF, "Control interface destroyed for port:%u\n",
+			port_id);
+
+	return 0;
+}
+
+int
+rte_eth_control_interface_destroy(void)
+{
+	int i;
+	int ret = 0;
+
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+		if (rte_eth_dev_is_valid_port(i)) {
+			ret = rte_eth_control_interface_destroy_one(i);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	return ret;
+}
+
+int
+rte_eth_control_interface_process_msg(int flag, unsigned int timeout_sec)
+{
+	return control_interface_process_msg(flag, timeout_sec);
+}
diff --git a/lib/librte_ctrl_if/rte_ctrl_if.h b/lib/librte_ctrl_if/rte_ctrl_if.h
new file mode 100644
index 0000000..dcaf6dd
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_ctrl_if.h
@@ -0,0 +1,115 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 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_CTRL_IF_H_
+#define _RTE_CTRL_IF_H_
+
+/**
+ * @file
+ *
+ * Control Interface Library for RTE
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <exec-env/rte_kcp_common.h>
+
+/**
+ * Flags values for rte_eth_control_interface_process_msg() API
+ */
+enum control_interface_process_flag {
+	/**< Process if msg available. */
+	RTE_ETHTOOL_CTRL_IF_PROCESS_MSG,
+
+	/**< Discard msg if available, respond with a error value. */
+	RTE_ETHTOOL_CTRL_IF_DISCARD_MSG,
+};
+
+/**
+ * Creates control interfaces (Linux virtual network interface)for
+ * each existing eal port.
+ *
+ * This API opens device created by supportive kernel module and initializes
+ * kernel communication interface.
+ *
+ * If supportive kernel module is not inserted this API will return
+ * an error.
+ *
+ * @return
+ *  0 on success.
+ *  Negative value on error.
+ */
+int rte_eth_control_interface_create(void);
+
+/**
+ * Destroys control interfaces.
+ *
+ * This API close device created by supportive kernel module and release
+ * underlying communication interface.
+ *
+ * @return
+ *  0 on success.
+ *  Negative value on error.
+ */
+int rte_eth_control_interface_destroy(void);
+
+/**
+ * Process if any received message is available.
+ *
+ * This function can be blocking or unblocking according timeout_sec
+ * parameter value. If function will be continuous loop, like can be
+ * called by any forwarding lcore, nonblocking mode should be preferred.
+ * If a separate thread created to handle control messages, blocking
+ * mode can be preferred to save CPU cycles.
+ *
+ * @param flag
+ *  Defines what to do with message, can be process or discard.
+ *
+ * @param timeout_sec
+ *  if 0, function is in nonblocking mode.
+ *  if > 0, blocks for given time, if there is no message available,
+ *  sleeps again same amount of time. Value is in seconds.
+ *
+ * @return
+ *  0 on success.
+ *  Negative value on error.
+ */
+int rte_eth_control_interface_process_msg(int flag, unsigned int timeout_sec);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_CTRL_IF_H_ */
diff --git a/lib/librte_ctrl_if/rte_ctrl_if_version.map b/lib/librte_ctrl_if/rte_ctrl_if_version.map
new file mode 100644
index 0000000..8b27e26
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_ctrl_if_version.map
@@ -0,0 +1,9 @@
+DPDK_2.3 {
+	global:
+
+	rte_eth_control_interface_create;
+	rte_eth_control_interface_destroy;
+	rte_eth_control_interface_process_msg;
+
+	local: *;
+};
diff --git a/lib/librte_ctrl_if/rte_ethtool.c b/lib/librte_ctrl_if/rte_ethtool.c
new file mode 100644
index 0000000..def968a
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_ethtool.c
@@ -0,0 +1,450 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 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 <error.h>
+
+#include <linux/if_link.h>
+
+#include <rte_version.h>
+#include <rte_ethdev.h>
+#include "rte_ethtool.h"
+
+#define ETHTOOL_GEEPROM_LEN 99
+#define ETHTOOL_GREGS_LEN 98
+#define ETHTOOL_GSSET_COUNT 97
+
+static int
+get_drvinfo(int port_id, void *data, int *data_len)
+{
+	struct ethtool_drvinfo *info = data;
+	struct rte_eth_dev_info dev_info;
+	int n;
+
+	memset(&dev_info, 0, sizeof(dev_info));
+	rte_eth_dev_info_get(port_id, &dev_info);
+
+	snprintf(info->driver, sizeof(info->driver), "%s",
+		dev_info.driver_name);
+	snprintf(info->version, sizeof(info->version), "%s",
+		rte_version());
+	snprintf(info->bus_info, sizeof(info->bus_info),
+		"%04x:%02x:%02x.%x",
+		dev_info.pci_dev->addr.domain, dev_info.pci_dev->addr.bus,
+		dev_info.pci_dev->addr.devid, dev_info.pci_dev->addr.function);
+
+	n = rte_eth_dev_get_reg_length(port_id);
+	info->regdump_len = n < 0 ? 0 : n;
+
+	n = rte_eth_dev_get_eeprom_length(port_id);
+	info->eedump_len = n < 0 ? 0 : n;
+
+	info->n_stats = sizeof(struct rte_eth_stats) / sizeof(uint64_t);
+	info->testinfo_len = 0;
+
+	*data_len = sizeof(struct ethtool_drvinfo);
+
+	return 0;
+}
+
+static int
+get_reg_len(int port_id, void *data, int *data_len)
+{
+	int reg_length = 0;
+
+	reg_length = rte_eth_dev_get_reg_length(port_id);
+	if (reg_length < 0)
+		return reg_length;
+
+	*(int *)data = reg_length * sizeof(uint32_t);
+	*data_len = sizeof(int);
+
+	return 0;
+}
+
+static int
+get_reg(int port_id, void *in_data, void *out_data, int *out_data_len)
+{
+	unsigned int reg_length;
+	int reg_length_out_len;
+	struct ethtool_regs *ethtool_regs = in_data;
+	struct rte_dev_reg_info regs = {
+		.data = out_data,
+		.length = ethtool_regs->len,
+	};
+	int ret;
+
+	ret = get_reg_len(port_id, &reg_length, &reg_length_out_len);
+	if (ret < 0 || reg_length > ethtool_regs->len)
+		return -1;
+
+	ret = rte_eth_dev_get_reg_info(port_id, &regs);
+	if (ret < 0)
+		return ret;
+
+	ethtool_regs->version = regs.version;
+	*out_data_len = reg_length;
+
+	return 0;
+}
+
+static int
+get_link(int port_id, void *data, int *data_len)
+{
+	struct rte_eth_link link;
+
+	rte_eth_link_get(port_id, &link);
+
+	*(int *)data = link.link_status;
+	*data_len = sizeof(int);
+
+	return 0;
+}
+
+static int
+get_eeprom_length(int port_id, void *data, int *data_len)
+{
+	int eeprom_length = 0;
+
+	eeprom_length = rte_eth_dev_get_eeprom_length(port_id);
+	if (eeprom_length < 0)
+		return eeprom_length;
+
+	*(int *)data = eeprom_length;
+	*data_len = sizeof(int);
+
+	return 0;
+}
+
+static int
+get_eeprom(int port_id, void *in_data, void *out_data, int *out_data_len)
+{
+	struct ethtool_eeprom *eeprom = in_data;
+	struct rte_dev_eeprom_info eeprom_info = {
+		.data = out_data,
+		.offset = eeprom->offset,
+		.length = eeprom->len,
+	};
+	int ret;
+
+	ret = rte_eth_dev_get_eeprom(port_id, &eeprom_info);
+	if (ret < 0)
+		return ret;
+
+	eeprom->magic = eeprom_info.magic;
+	*out_data_len = eeprom->len;
+
+	return 0;
+}
+
+static int
+set_eeprom(int port_id, void *in_data)
+{
+	struct ethtool_eeprom *eeprom = in_data;
+	struct rte_dev_eeprom_info eeprom_info = {
+		.data = eeprom->data,
+		.offset = eeprom->offset,
+		.length = eeprom->len,
+	};
+	int ret;
+
+	ret = rte_eth_dev_set_eeprom(port_id, &eeprom_info);
+	if (ret < 0)
+		return ret;
+
+	eeprom->magic = eeprom_info.magic;
+
+	return 0;
+}
+
+static int
+get_ringparam(int port_id, void *data, int *data_len)
+{
+	struct ethtool_ringparam *ringparam = data;
+	struct rte_eth_dev_info dev_info;
+	struct rte_eth_rxq_info rx_qinfo;
+	struct rte_eth_txq_info tx_qinfo;
+	int ret;
+
+	rte_eth_dev_info_get(port_id, &dev_info);
+
+	ret = rte_eth_rx_queue_info_get(port_id, 0, &rx_qinfo);
+	if (ret != 0)
+		return -1;
+
+	ret = rte_eth_tx_queue_info_get(port_id, 0, &tx_qinfo);
+	if (ret != 0)
+		return -1;
+
+	memset(ringparam, 0, sizeof(struct ethtool_ringparam));
+	ringparam->rx_pending = rx_qinfo.nb_desc;
+	ringparam->rx_max_pending = dev_info.rx_desc_lim.nb_max;
+	ringparam->tx_pending = tx_qinfo.nb_desc;
+	ringparam->tx_max_pending = dev_info.tx_desc_lim.nb_max;
+
+	*data_len = sizeof(struct ethtool_ringparam);
+
+	return 0;
+}
+
+static int
+set_ringparam(int port_id, void *data)
+{
+	struct ethtool_ringparam *ringparam = data;
+	struct rte_eth_rxq_info rx_qinfo;
+	int ret;
+
+	ret = rte_eth_rx_queue_info_get(port_id, 0, &rx_qinfo);
+	if (ret != 0)
+		return -1;
+
+	rte_eth_dev_stop(port_id);
+
+	ret = rte_eth_tx_queue_setup(port_id, 0, ringparam->tx_pending,
+		rte_socket_id(), NULL);
+	if (ret != 0)
+		return -1;
+
+	ret = rte_eth_rx_queue_setup(port_id, 0, ringparam->rx_pending,
+		rte_socket_id(), NULL, rx_qinfo.mp);
+	if (ret != 0)
+		return -1;
+
+	return rte_eth_dev_start(port_id);
+}
+
+static int
+get_pauseparam(int port_id, void *data, int *data_len)
+{
+	struct ethtool_pauseparam *pauseparam = data;
+	struct rte_eth_fc_conf fc_conf;
+	int ret;
+
+	ret = rte_eth_dev_flow_ctrl_get(port_id, &fc_conf);
+	if (ret)
+		return -1;
+
+	pauseparam->tx_pause = 0;
+	pauseparam->rx_pause = 0;
+
+	switch (fc_conf.mode) {
+	case RTE_FC_RX_PAUSE:
+		pauseparam->rx_pause = 1;
+		break;
+	case RTE_FC_TX_PAUSE:
+		pauseparam->tx_pause = 1;
+		break;
+	case RTE_FC_FULL:
+		pauseparam->rx_pause = 1;
+		pauseparam->tx_pause = 1;
+	default:
+		break;
+	}
+	pauseparam->autoneg = (uint32_t)fc_conf.autoneg;
+
+	*data_len = sizeof(struct ethtool_pauseparam);
+
+	return 0;
+}
+
+static int
+set_pauseparam(int port_id, void *data)
+{
+	struct ethtool_pauseparam *pauseparam = data;
+	struct rte_eth_fc_conf fc_conf;
+	int ret;
+
+	ret = rte_eth_dev_flow_ctrl_get(port_id, &fc_conf);
+	if (ret)
+		return -1;
+
+	fc_conf.autoneg = pauseparam->autoneg;
+
+	if (pauseparam->tx_pause) {
+		if (pauseparam->rx_pause)
+			fc_conf.mode = RTE_FC_FULL;
+		else
+			fc_conf.mode = RTE_FC_TX_PAUSE;
+	} else {
+		if (pauseparam->rx_pause)
+			fc_conf.mode = RTE_FC_RX_PAUSE;
+		else
+			fc_conf.mode = RTE_FC_NONE;
+	}
+
+	ret = rte_eth_dev_flow_ctrl_set(port_id, &fc_conf);
+	if (ret)
+		return -1;
+
+	return 0;
+}
+
+int
+rte_eth_dev_ethtool_process(int cmd_id, int port_id, void *in_data,
+		void *out_data, int *out_data_len)
+{
+	int ret = 0;
+
+	if (!rte_eth_dev_is_valid_port(port_id))
+		return -ENODEV;
+
+	switch (cmd_id) {
+	case ETHTOOL_GDRVINFO:
+		return get_drvinfo(port_id, out_data, out_data_len);
+	case ETHTOOL_GREGS_LEN:
+		return get_reg_len(port_id, out_data, out_data_len);
+	case ETHTOOL_GREGS:
+		return get_reg(port_id, in_data, out_data, out_data_len);
+	case ETHTOOL_GLINK:
+		return get_link(port_id, out_data, out_data_len);
+	case ETHTOOL_GEEPROM_LEN:
+		return get_eeprom_length(port_id, out_data, out_data_len);
+	case ETHTOOL_GEEPROM:
+		return get_eeprom(port_id, in_data, out_data, out_data_len);
+	case ETHTOOL_SEEPROM:
+		return set_eeprom(port_id, in_data);
+	case ETHTOOL_GRINGPARAM:
+		return get_ringparam(port_id, out_data, out_data_len);
+	case ETHTOOL_SRINGPARAM:
+		return set_ringparam(port_id, in_data);
+	case ETHTOOL_GPAUSEPARAM:
+		return get_pauseparam(port_id, out_data, out_data_len);
+	case ETHTOOL_SPAUSEPARAM:
+		return set_pauseparam(port_id, in_data);
+	default:
+		ret = EOPNOTSUPP;
+		break;
+	}
+
+	return ret;
+}
+
+static int
+set_mtu(int port_id, void *in_data)
+{
+	int *mtu = in_data;
+
+	return rte_eth_dev_set_mtu(port_id, *mtu);
+}
+
+static int
+get_stats(int port_id, void *data, int *data_len)
+{
+	struct rte_eth_stats stats;
+	struct rtnl_link_stats64 *if_stats = data;
+	int ret;
+
+	ret = rte_eth_stats_get(port_id, &stats);
+	if (ret < 0)
+		return -EOPNOTSUPP;
+
+	if_stats->rx_packets = stats.ipackets;
+	if_stats->tx_packets = stats.opackets;
+	if_stats->rx_bytes = stats.ibytes;
+	if_stats->tx_bytes = stats.obytes;
+	if_stats->rx_errors = stats.ierrors;
+	if_stats->tx_errors = stats.oerrors;
+	if_stats->rx_dropped = stats.imissed;
+	if_stats->multicast = stats.imcasts;
+
+	*data_len = sizeof(struct rtnl_link_stats64);
+
+	return 0;
+}
+
+static int
+get_mac(int port_id, void *data, int *data_len)
+{
+	struct ether_addr addr;
+
+	rte_eth_macaddr_get(port_id, &addr);
+	memcpy(data, &addr, sizeof(struct ether_addr));
+
+	*data_len = sizeof(struct ether_addr);
+
+	return 0;
+}
+
+static int
+set_mac(int port_id, void *in_data)
+{
+	struct ether_addr addr;
+
+	memcpy(&addr, in_data, ETHER_ADDR_LEN);
+
+	return rte_eth_dev_default_mac_addr_set(port_id, &addr);
+}
+
+static int
+start_port(int port_id)
+{
+	rte_eth_dev_stop(port_id);
+	return rte_eth_dev_start(port_id);
+}
+
+static int
+stop_port(int port_id)
+{
+	rte_eth_dev_stop(port_id);
+	return 0;
+}
+
+int
+rte_eth_dev_control_process(int cmd_id, int port_id, void *in_data,
+		void *out_data, int *out_data_len)
+{
+	int ret = 0;
+
+	if (!rte_eth_dev_is_valid_port(port_id))
+		return -ENODEV;
+
+	switch (cmd_id) {
+	case RTE_KCP_REQ_CHANGE_MTU:
+		return set_mtu(port_id, in_data);
+	case RTE_KCP_REQ_GET_STATS:
+		return get_stats(port_id, out_data, out_data_len);
+	case RTE_KCP_REQ_GET_MAC:
+		return get_mac(port_id, out_data, out_data_len);
+	case RTE_KCP_REQ_SET_MAC:
+		return set_mac(port_id, in_data);
+	case RTE_KCP_REQ_START_PORT:
+		return start_port(port_id);
+	case RTE_KCP_REQ_STOP_PORT:
+		return stop_port(port_id);
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+
+	return ret;
+}
diff --git a/lib/librte_ctrl_if/rte_ethtool.h b/lib/librte_ctrl_if/rte_ethtool.h
new file mode 100644
index 0000000..19f364f
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_ethtool.h
@@ -0,0 +1,54 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 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_ETHTOOL_H_
+#define _RTE_ETHTOOL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <linux/ethtool.h>
+
+#include <exec-env/rte_kcp_common.h>
+
+int rte_eth_dev_ethtool_process(int cmd_id, int port_id, void *in_data,
+		void *out_data, int *out_data_len);
+int rte_eth_dev_control_process(int cmd_id, int port_id, void *in_data,
+		void *out_data, int *out_data_len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_ETHTOOL_H_ */
diff --git a/lib/librte_ctrl_if/rte_nl.c b/lib/librte_ctrl_if/rte_nl.c
new file mode 100644
index 0000000..adc5fa8
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_nl.c
@@ -0,0 +1,274 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 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 <unistd.h>
+
+#include <sys/socket.h>
+#include <linux/netlink.h>
+
+#include <rte_spinlock.h>
+#include <rte_ethdev.h>
+#include "rte_ethtool.h"
+#include "rte_nl.h"
+#include "rte_ctrl_if.h"
+
+#define MAX_PAYLOAD sizeof(struct kcp_ethtool_msg)
+
+struct ctrl_if_nl {
+	union {
+		struct nlmsghdr nlh;
+		uint8_t nlmsg[NLMSG_SPACE(MAX_PAYLOAD)];
+	};
+	struct msghdr msg;
+	struct iovec iov;
+};
+
+static int sock_fd = -1;
+pthread_t thread_id;
+
+struct sockaddr_nl dest_addr;
+
+pthread_cond_t cond  = PTHREAD_COND_INITIALIZER;
+pthread_mutex_t msg_lock = PTHREAD_MUTEX_INITIALIZER;
+
+static struct ctrl_if_nl nl_s;
+static struct ctrl_if_nl nl_r;
+
+static int kcp_ethtool_msg_count;
+static struct kcp_ethtool_msg msg_storage;
+
+static int
+nl_send(void *buf, size_t len)
+{
+	int ret;
+
+	if (nl_s.nlh.nlmsg_len < len) {
+		RTE_LOG(ERR, CTRL_IF, "Message is too big, len:%zu\n", len);
+		return -1;
+	}
+
+	if (!NLMSG_OK(&nl_s.nlh, NLMSG_SPACE(MAX_PAYLOAD))) {
+		RTE_LOG(ERR, CTRL_IF, "Message is not OK\n");
+		return -1;
+	}
+
+	/* Fill in the netlink message payload */
+	memcpy(NLMSG_DATA(nl_s.nlmsg), buf, len);
+
+	ret = sendmsg(sock_fd, &nl_s.msg, 0);
+
+	if (ret < 0)
+		RTE_LOG(ERR, CTRL_IF, "Failed nl msg send. ret:%d, err:%d\n",
+				ret, errno);
+	return ret;
+}
+
+static int
+nl_ethtool_msg_send(struct kcp_ethtool_msg *msg)
+{
+	return nl_send((void *)msg, sizeof(struct kcp_ethtool_msg));
+}
+
+static void
+process_msg(struct kcp_ethtool_msg *msg)
+{
+	if (msg->cmd_id > RTE_KCP_REQ_UNKNOWN) {
+		msg->err = rte_eth_dev_control_process(msg->cmd_id,
+				msg->port_id, msg->input_buffer,
+				msg->output_buffer, &msg->output_buffer_len);
+	} else {
+		msg->err = rte_eth_dev_ethtool_process(msg->cmd_id,
+				msg->port_id, msg->input_buffer,
+				msg->output_buffer, &msg->output_buffer_len);
+	}
+
+	if (msg->err)
+		memset(msg->output_buffer, 0, msg->output_buffer_len);
+
+	nl_ethtool_msg_send(msg);
+}
+
+int
+control_interface_process_msg(int flag, unsigned int timeout_sec)
+{
+	int ret = 0;
+	struct timespec ts;
+
+	pthread_mutex_lock(&msg_lock);
+
+	clock_gettime(CLOCK_REALTIME, &ts);
+	ts.tv_sec += timeout_sec;
+	while (timeout_sec && !kcp_ethtool_msg_count && !ret)
+		ret = pthread_cond_timedwait(&cond, &msg_lock, &ts);
+
+	switch (flag) {
+	case RTE_ETHTOOL_CTRL_IF_PROCESS_MSG:
+		if (kcp_ethtool_msg_count) {
+			process_msg(&msg_storage);
+			kcp_ethtool_msg_count = 0;
+		}
+		ret = 0;
+		break;
+
+	case RTE_ETHTOOL_CTRL_IF_DISCARD_MSG:
+		if (kcp_ethtool_msg_count) {
+			msg_storage.err = -1;
+			nl_ethtool_msg_send(&msg_storage);
+			kcp_ethtool_msg_count = 0;
+		}
+		ret = 0;
+		break;
+
+	default:
+		ret = -1;
+		break;
+	}
+	pthread_mutex_unlock(&msg_lock);
+
+	return ret;
+}
+
+static int
+msg_add_and_signal(struct nlmsghdr *nlh)
+{
+	pthread_mutex_lock(&msg_lock);
+
+	memcpy(&msg_storage, NLMSG_DATA(nlh), sizeof(struct kcp_ethtool_msg));
+	kcp_ethtool_msg_count = 1;
+	msg_storage.flag = KCP_MSG_FLAG_RESPONSE;
+
+	pthread_cond_signal(&cond);
+
+	pthread_mutex_unlock(&msg_lock);
+
+	return 0;
+}
+
+static void *
+nl_recv(void *arg)
+{
+	int ret;
+
+	for (;;) {
+		ret = recvmsg(sock_fd, &nl_r.msg, 0);
+		if (ret < 0)
+			continue;
+
+		if ((unsigned)ret < sizeof(struct kcp_ethtool_msg)) {
+			RTE_LOG(WARNING, CTRL_IF,
+					"Received %u bytes, payload %lu\n",
+					ret, sizeof(struct kcp_ethtool_msg));
+			continue;
+		}
+
+		msg_add_and_signal(&nl_r.nlh);
+	}
+
+	return arg;
+}
+
+static void
+nl_setup_header(struct ctrl_if_nl *nl)
+{
+	dest_addr.nl_family = AF_NETLINK;
+	dest_addr.nl_pid = 0;   /*  For Linux Kernel */
+	dest_addr.nl_groups = 0;
+
+	memset(nl->nlmsg, 0, NLMSG_SPACE(MAX_PAYLOAD));
+
+	/* Fill the netlink message header */
+	nl->nlh.nlmsg_len = NLMSG_LENGTH(MAX_PAYLOAD);
+	nl->nlh.nlmsg_pid = getpid();  /* self pid */
+	nl->nlh.nlmsg_flags = 0;
+
+	nl->iov.iov_base = (void *)nl->nlmsg;
+	nl->iov.iov_len = nl->nlh.nlmsg_len;
+	memset(&nl->msg, 0, sizeof(struct msghdr));
+	nl->msg.msg_name = (void *)&dest_addr;
+	nl->msg.msg_namelen = sizeof(struct sockaddr_nl);
+	nl->msg.msg_iov = &nl->iov;
+	nl->msg.msg_iovlen = 1;
+}
+
+static int
+nl_socket_init(void)
+{
+	struct sockaddr_nl src_addr;
+	int fd;
+	int ret;
+
+	fd = socket(PF_NETLINK, SOCK_RAW, KCP_NL_GRP);
+	if (fd < 0)
+		return -1;
+
+	src_addr.nl_family = AF_NETLINK;
+	src_addr.nl_pid = getpid();
+	ret = bind(fd, (struct sockaddr *)&src_addr, sizeof(src_addr));
+	if (ret) {
+		close(fd);
+		return -1;
+	}
+
+	nl_setup_header(&nl_s);
+	nl_setup_header(&nl_r);
+
+	return fd;
+}
+
+int
+control_interface_nl_init(void)
+{
+	int ret;
+
+	sock_fd = nl_socket_init();
+	if (sock_fd < 0) {
+		RTE_LOG(ERR, CTRL_IF, "Failed to initialize netlink socket\n");
+		return -1;
+	}
+
+	ret = pthread_create(&thread_id, NULL, nl_recv, NULL);
+	if (ret != 0) {
+		RTE_LOG(ERR, CTRL_IF, "Failed to create receive thread.\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+void
+control_interface_nl_release(void)
+{
+	pthread_cancel(thread_id);
+	pthread_join(thread_id, NULL);
+	close(sock_fd);
+}
diff --git a/lib/librte_ctrl_if/rte_nl.h b/lib/librte_ctrl_if/rte_nl.h
new file mode 100644
index 0000000..ee06d90
--- /dev/null
+++ b/lib/librte_ctrl_if/rte_nl.h
@@ -0,0 +1,49 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 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_NL_H_
+#define _RTE_NL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int control_interface_nl_init(void);
+void control_interface_nl_release(void);
+int control_interface_process_msg(int flag, unsigned int timeout_sec);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_NL_H_ */
diff --git a/lib/librte_eal/common/include/rte_log.h b/lib/librte_eal/common/include/rte_log.h
index 2e47e7f..a0a2c9f 100644
--- a/lib/librte_eal/common/include/rte_log.h
+++ b/lib/librte_eal/common/include/rte_log.h
@@ -1,7 +1,7 @@
 /*-
  *   BSD LICENSE
  *
- *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
  *   All rights reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
@@ -79,6 +79,7 @@ extern struct rte_logs rte_logs;
 #define RTE_LOGTYPE_PIPELINE 0x00008000 /**< Log related to pipeline. */
 #define RTE_LOGTYPE_MBUF    0x00010000 /**< Log related to mbuf. */
 #define RTE_LOGTYPE_CRYPTODEV 0x00020000 /**< Log related to cryptodev. */
+#define RTE_LOGTYPE_CTRL_IF 0x00040000 /**< Log related to control interface. */
 
 /* these log types can be used in an application */
 #define RTE_LOGTYPE_USER1   0x01000000 /**< User-defined log type 1. */
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index 8ecab41..e1638f0 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -1,6 +1,6 @@
 #   BSD LICENSE
 #
-#   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+#   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
 #   Copyright(c) 2014-2015 6WIND S.A.
 #   All rights reserved.
 #
@@ -122,6 +122,7 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_MBUF)           += -lrte_mbuf
 _LDLIBS-$(CONFIG_RTE_LIBRTE_MBUF_OFFLOAD)   += -lrte_mbuf_offload
 _LDLIBS-$(CONFIG_RTE_LIBRTE_IP_FRAG)        += -lrte_ip_frag
 _LDLIBS-$(CONFIG_RTE_LIBRTE_ETHER)          += -lethdev
+_LDLIBS-$(CONFIG_RTE_LIBRTE_CTRL_IF)        += -lrte_ctrl_if
 _LDLIBS-$(CONFIG_RTE_LIBRTE_CRYPTODEV)      += -lrte_cryptodev
 _LDLIBS-$(CONFIG_RTE_LIBRTE_MEMPOOL)        += -lrte_mempool
 _LDLIBS-$(CONFIG_RTE_LIBRTE_RING)           += -lrte_ring
-- 
2.5.0