[dpdk-dev] [PATCH v4 1/4] port: kni interface support

[Ethan Zhuang <zhuangwj@gmail.com>]

From: WeiJie Zhuang <zhuangwj@gmail.com>

add KNI port type to the packet framework

Signed-off-by: WeiJie Zhuang <zhuangwj@gmail.com>
---
v2:
* Fix check patch error.
v3:
* Fix code review comments.
v4:
* Reorganize patch sets and fix some comments
---
 lib/librte_port/Makefile             |   7 +
 lib/librte_port/rte_port_kni.c       | 545 +++++++++++++++++++++++++++++++++++
 lib/librte_port/rte_port_kni.h       |  95 ++++++
 lib/librte_port/rte_port_version.map |   9 +
 4 files changed, 656 insertions(+)
 create mode 100644 lib/librte_port/rte_port_kni.c
 create mode 100644 lib/librte_port/rte_port_kni.h

diff --git a/lib/librte_port/Makefile b/lib/librte_port/Makefile
index dc6a601..0fc929b 100644
--- a/lib/librte_port/Makefile
+++ b/lib/librte_port/Makefile
@@ -56,6 +56,9 @@ SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_frag.c
 SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_ras.c
 endif
 SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_sched.c
+ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
+SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_kni.c
+endif
 SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_source_sink.c
 
 # install includes
@@ -67,6 +70,9 @@ SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_frag.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_ras.h
 endif
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_sched.h
+ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
+SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_kni.h
+endif
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_source_sink.h
 
 # this lib depends upon:
@@ -76,5 +82,6 @@ DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_mempool
 DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_ether
 DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_ip_frag
 DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_sched
+DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_kni
 
 include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_port/rte_port_kni.c b/lib/librte_port/rte_port_kni.c
new file mode 100644
index 0000000..08f4ac2
--- /dev/null
+++ b/lib/librte_port/rte_port_kni.c
@@ -0,0 +1,545 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 Ethan Zhuang <zhuangwj@gmail.com>.
+ *   Copyright(c) 2016 Intel Corporation.
+ *   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 <string.h>
+
+#include <rte_common.h>
+#include <rte_malloc.h>
+#include <rte_kni.h>
+
+#include "rte_port_kni.h"
+
+/*
+ * Port KNI Reader
+ */
+#ifdef RTE_PORT_STATS_COLLECT
+
+#define RTE_PORT_KNI_READER_STATS_PKTS_IN_ADD(port, val) \
+	port->stats.n_pkts_in += val
+#define RTE_PORT_KNI_READER_STATS_PKTS_DROP_ADD(port, val) \
+	port->stats.n_pkts_drop += val
+
+#else
+
+#define RTE_PORT_KNI_READER_STATS_PKTS_IN_ADD(port, val)
+#define RTE_PORT_KNI_READER_STATS_PKTS_DROP_ADD(port, val)
+
+#endif
+
+struct rte_port_kni_reader {
+	struct rte_port_in_stats stats;
+
+	struct rte_kni *kni;
+};
+
+static void *
+rte_port_kni_reader_create(void *params, int socket_id)
+{
+	struct rte_port_kni_reader_params *conf =
+			(struct rte_port_kni_reader_params *) params;
+	struct rte_port_kni_reader *port;
+
+	/* Check input parameters */
+	if (conf == NULL) {
+		RTE_LOG(ERR, PORT, "%s: params is NULL\n", __func__);
+		return NULL;
+	}
+
+	/* Memory allocation */
+	port = rte_zmalloc_socket("PORT", sizeof(*port),
+		RTE_CACHE_LINE_SIZE, socket_id);
+	if (port == NULL) {
+		RTE_LOG(ERR, PORT, "%s: Failed to allocate port\n", __func__);
+		return NULL;
+	}
+
+	/* Initialization */
+	port->kni = conf->kni;
+
+	return port;
+}
+
+static int
+rte_port_kni_reader_rx(void *port, struct rte_mbuf **pkts, uint32_t n_pkts)
+{
+	struct rte_port_kni_reader *p =
+			(struct rte_port_kni_reader *) port;
+	uint16_t rx_pkt_cnt;
+
+	rx_pkt_cnt = rte_kni_rx_burst(p->kni, pkts, n_pkts);
+	RTE_PORT_KNI_READER_STATS_PKTS_IN_ADD(p, rx_pkt_cnt);
+	return rx_pkt_cnt;
+}
+
+static int
+rte_port_kni_reader_free(void *port)
+{
+	if (port == NULL) {
+		RTE_LOG(ERR, PORT, "%s: port is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	rte_free(port);
+
+	return 0;
+}
+
+static int rte_port_kni_reader_stats_read(void *port,
+	struct rte_port_in_stats *stats, int clear)
+{
+	struct rte_port_kni_reader *p =
+			(struct rte_port_kni_reader *) port;
+
+	if (stats != NULL)
+		memcpy(stats, &p->stats, sizeof(p->stats));
+
+	if (clear)
+		memset(&p->stats, 0, sizeof(p->stats));
+
+	return 0;
+}
+
+/*
+ * Port KNI Writer
+ */
+#ifdef RTE_PORT_STATS_COLLECT
+
+#define RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(port, val) \
+	port->stats.n_pkts_in += val
+#define RTE_PORT_KNI_WRITER_STATS_PKTS_DROP_ADD(port, val) \
+	port->stats.n_pkts_drop += val
+
+#else
+
+#define RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(port, val)
+#define RTE_PORT_KNI_WRITER_STATS_PKTS_DROP_ADD(port, val)
+
+#endif
+
+struct rte_port_kni_writer {
+	struct rte_port_out_stats stats;
+
+	struct rte_mbuf *tx_buf[2 * RTE_PORT_IN_BURST_SIZE_MAX];
+	uint32_t tx_burst_sz;
+	uint32_t tx_buf_count;
+	uint64_t bsz_mask;
+	struct rte_kni *kni;
+};
+
+static void *
+rte_port_kni_writer_create(void *params, int socket_id)
+{
+	struct rte_port_kni_writer_params *conf =
+			(struct rte_port_kni_writer_params *) params;
+	struct rte_port_kni_writer *port;
+
+	/* Check input parameters */
+	if ((conf == NULL) ||
+		(conf->tx_burst_sz == 0) ||
+		(conf->tx_burst_sz > RTE_PORT_IN_BURST_SIZE_MAX) ||
+		(!rte_is_power_of_2(conf->tx_burst_sz))) {
+		RTE_LOG(ERR, PORT, "%s: Invalid input parameters\n", __func__);
+		return NULL;
+	}
+
+	/* Memory allocation */
+	port = rte_zmalloc_socket("PORT", sizeof(*port),
+		RTE_CACHE_LINE_SIZE, socket_id);
+	if (port == NULL) {
+		RTE_LOG(ERR, PORT, "%s: Failed to allocate port\n", __func__);
+		return NULL;
+	}
+
+	/* Initialization */
+	port->kni = conf->kni;
+	port->tx_burst_sz = conf->tx_burst_sz;
+	port->tx_buf_count = 0;
+	port->bsz_mask = 1LLU << (conf->tx_burst_sz - 1);
+
+	return port;
+}
+
+static inline void
+send_burst(struct rte_port_kni_writer *p)
+{
+	uint32_t nb_tx;
+
+	nb_tx = rte_kni_tx_burst(p->kni, p->tx_buf, p->tx_buf_count);
+
+	RTE_PORT_KNI_WRITER_STATS_PKTS_DROP_ADD(p, p->tx_buf_count - nb_tx);
+	for (; nb_tx < p->tx_buf_count; nb_tx++)
+		rte_pktmbuf_free(p->tx_buf[nb_tx]);
+
+	p->tx_buf_count = 0;
+}
+
+static int
+rte_port_kni_writer_tx(void *port, struct rte_mbuf *pkt)
+{
+	struct rte_port_kni_writer *p =
+			(struct rte_port_kni_writer *) port;
+
+	p->tx_buf[p->tx_buf_count++] = pkt;
+	RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(p, 1);
+	if (p->tx_buf_count >= p->tx_burst_sz)
+		send_burst(p);
+
+	return 0;
+}
+
+static int
+rte_port_kni_writer_tx_bulk(void *port,
+	struct rte_mbuf **pkts,
+	uint64_t pkts_mask)
+{
+	struct rte_port_kni_writer *p =
+			(struct rte_port_kni_writer *) port;
+	uint64_t bsz_mask = p->bsz_mask;
+	uint32_t tx_buf_count = p->tx_buf_count;
+	uint64_t expr = (pkts_mask & (pkts_mask + 1)) |
+					((pkts_mask & bsz_mask) ^ bsz_mask);
+
+	if (expr == 0) {
+		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
+		uint32_t n_pkts_ok;
+
+		if (tx_buf_count)
+			send_burst(p);
+
+		RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(p, n_pkts);
+		n_pkts_ok = rte_kni_tx_burst(p->kni, pkts, n_pkts);
+
+		RTE_PORT_KNI_WRITER_STATS_PKTS_DROP_ADD(p, n_pkts - n_pkts_ok);
+		for (; n_pkts_ok < n_pkts; n_pkts_ok++) {
+			struct rte_mbuf *pkt = pkts[n_pkts_ok];
+
+			rte_pktmbuf_free(pkt);
+		}
+	} else {
+		for (; pkts_mask;) {
+			uint32_t pkt_index = __builtin_ctzll(pkts_mask);
+			uint64_t pkt_mask = 1LLU << pkt_index;
+			struct rte_mbuf *pkt = pkts[pkt_index];
+
+			p->tx_buf[tx_buf_count++] = pkt;
+			RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(p, 1);
+			pkts_mask &= ~pkt_mask;
+		}
+
+		p->tx_buf_count = tx_buf_count;
+		if (tx_buf_count >= p->tx_burst_sz)
+			send_burst(p);
+	}
+
+	return 0;
+}
+
+static int
+rte_port_kni_writer_flush(void *port)
+{
+	struct rte_port_kni_writer *p =
+			(struct rte_port_kni_writer *) port;
+
+	if (p->tx_buf_count > 0)
+		send_burst(p);
+
+	return 0;
+}
+
+static int
+rte_port_kni_writer_free(void *port)
+{
+	if (port == NULL) {
+		RTE_LOG(ERR, PORT, "%s: Port is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	rte_port_kni_writer_flush(port);
+	rte_free(port);
+
+	return 0;
+}
+
+static int rte_port_kni_writer_stats_read(void *port,
+	struct rte_port_out_stats *stats, int clear)
+{
+	struct rte_port_kni_writer *p =
+			(struct rte_port_kni_writer *) port;
+
+	if (stats != NULL)
+		memcpy(stats, &p->stats, sizeof(p->stats));
+
+	if (clear)
+		memset(&p->stats, 0, sizeof(p->stats));
+
+	return 0;
+}
+
+/*
+ * Port KNI Writer Nodrop
+ */
+#ifdef RTE_PORT_STATS_COLLECT
+
+#define RTE_PORT_KNI_WRITER_NODROP_STATS_PKTS_IN_ADD(port, val) \
+	port->stats.n_pkts_in += val
+#define RTE_PORT_KNI_WRITER_NODROP_STATS_PKTS_DROP_ADD(port, val) \
+	port->stats.n_pkts_drop += val
+
+#else
+
+#define RTE_PORT_KNI_WRITER_NODROP_STATS_PKTS_IN_ADD(port, val)
+#define RTE_PORT_KNI_WRITER_NODROP_STATS_PKTS_DROP_ADD(port, val)
+
+#endif
+
+struct rte_port_kni_writer_nodrop {
+	struct rte_port_out_stats stats;
+
+	struct rte_mbuf *tx_buf[2 * RTE_PORT_IN_BURST_SIZE_MAX];
+	uint32_t tx_burst_sz;
+	uint32_t tx_buf_count;
+	uint64_t bsz_mask;
+	uint64_t n_retries;
+	struct rte_kni *kni;
+};
+
+static void *
+rte_port_kni_writer_nodrop_create(void *params, int socket_id)
+{
+	struct rte_port_kni_writer_nodrop_params *conf =
+		(struct rte_port_kni_writer_nodrop_params *) params;
+	struct rte_port_kni_writer_nodrop *port;
+
+	/* Check input parameters */
+	if ((conf == NULL) ||
+		(conf->tx_burst_sz == 0) ||
+		(conf->tx_burst_sz > RTE_PORT_IN_BURST_SIZE_MAX) ||
+		(!rte_is_power_of_2(conf->tx_burst_sz))) {
+		RTE_LOG(ERR, PORT, "%s: Invalid input parameters\n", __func__);
+		return NULL;
+	}
+
+	/* Memory allocation */
+	port = rte_zmalloc_socket("PORT", sizeof(*port),
+		RTE_CACHE_LINE_SIZE, socket_id);
+	if (port == NULL) {
+		RTE_LOG(ERR, PORT, "%s: Failed to allocate port\n", __func__);
+		return NULL;
+	}
+
+	/* Initialization */
+	port->kni = conf->kni;
+	port->tx_burst_sz = conf->tx_burst_sz;
+	port->tx_buf_count = 0;
+	port->bsz_mask = 1LLU << (conf->tx_burst_sz - 1);
+
+	/*
+	 * When n_retries is 0 it means that we should wait for every packet to
+	 * send no matter how many retries should it take. To limit number of
+	 * branches in fast path, we use UINT64_MAX instead of branching.
+	 */
+	port->n_retries = (conf->n_retries == 0) ? UINT64_MAX : conf->n_retries;
+
+	return port;
+}
+
+static inline void
+send_burst_nodrop(struct rte_port_kni_writer_nodrop *p)
+{
+	uint32_t nb_tx = 0, i;
+
+	nb_tx = rte_kni_tx_burst(p->kni, p->tx_buf, p->tx_buf_count);
+
+	/* We sent all the packets in a first try */
+	if (nb_tx >= p->tx_buf_count) {
+		p->tx_buf_count = 0;
+		return;
+	}
+
+	for (i = 0; i < p->n_retries; i++) {
+		nb_tx += rte_kni_tx_burst(p->kni,
+			p->tx_buf + nb_tx,
+			p->tx_buf_count - nb_tx);
+
+		/* We sent all the packets in more than one try */
+		if (nb_tx >= p->tx_buf_count) {
+			p->tx_buf_count = 0;
+			return;
+		}
+	}
+
+	/* We didn't send the packets in maximum allowed attempts */
+	RTE_PORT_KNI_WRITER_NODROP_STATS_PKTS_DROP_ADD(p, p->tx_buf_count - nb_tx);
+	for ( ; nb_tx < p->tx_buf_count; nb_tx++)
+		rte_pktmbuf_free(p->tx_buf[nb_tx]);
+
+	p->tx_buf_count = 0;
+}
+
+static int
+rte_port_kni_writer_nodrop_tx(void *port, struct rte_mbuf *pkt)
+{
+	struct rte_port_kni_writer_nodrop *p =
+			(struct rte_port_kni_writer_nodrop *) port;
+
+	p->tx_buf[p->tx_buf_count++] = pkt;
+	RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(p, 1);
+	if (p->tx_buf_count >= p->tx_burst_sz)
+		send_burst_nodrop(p);
+
+	return 0;
+}
+
+static int
+rte_port_kni_writer_nodrop_tx_bulk(void *port,
+	struct rte_mbuf **pkts,
+	uint64_t pkts_mask)
+{
+	struct rte_port_kni_writer_nodrop *p =
+			(struct rte_port_kni_writer_nodrop *) port;
+
+	uint64_t bsz_mask = p->bsz_mask;
+	uint32_t tx_buf_count = p->tx_buf_count;
+	uint64_t expr = (pkts_mask & (pkts_mask + 1)) |
+					((pkts_mask & bsz_mask) ^ bsz_mask);
+
+	if (expr == 0) {
+		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
+		uint32_t n_pkts_ok;
+
+		if (tx_buf_count)
+			send_burst_nodrop(p);
+
+		RTE_PORT_KNI_WRITER_NODROP_STATS_PKTS_IN_ADD(p, n_pkts);
+		n_pkts_ok = rte_kni_tx_burst(p->kni, pkts, n_pkts);
+
+		if (n_pkts_ok >= n_pkts)
+			return 0;
+
+		/*
+		 * If we didn't manage to send all packets in single burst, move
+		 * remaining packets to the buffer and call send burst.
+		 */
+		for (; n_pkts_ok < n_pkts; n_pkts_ok++) {
+			struct rte_mbuf *pkt = pkts[n_pkts_ok];
+			p->tx_buf[p->tx_buf_count++] = pkt;
+		}
+		send_burst_nodrop(p);
+	} else {
+		for ( ; pkts_mask; ) {
+			uint32_t pkt_index = __builtin_ctzll(pkts_mask);
+			uint64_t pkt_mask = 1LLU << pkt_index;
+			struct rte_mbuf *pkt = pkts[pkt_index];
+
+			p->tx_buf[tx_buf_count++] = pkt;
+			RTE_PORT_KNI_WRITER_NODROP_STATS_PKTS_IN_ADD(p, 1);
+			pkts_mask &= ~pkt_mask;
+		}
+
+		p->tx_buf_count = tx_buf_count;
+		if (tx_buf_count >= p->tx_burst_sz)
+			send_burst_nodrop(p);
+	}
+
+	return 0;
+}
+
+static int
+rte_port_kni_writer_nodrop_flush(void *port)
+{
+	struct rte_port_kni_writer_nodrop *p =
+		(struct rte_port_kni_writer_nodrop *) port;
+
+	if (p->tx_buf_count > 0)
+		send_burst_nodrop(p);
+
+	return 0;
+}
+
+static int
+rte_port_kni_writer_nodrop_free(void *port)
+{
+	if (port == NULL) {
+		RTE_LOG(ERR, PORT, "%s: Port is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	rte_port_kni_writer_nodrop_flush(port);
+	rte_free(port);
+
+	return 0;
+}
+
+static int rte_port_kni_writer_nodrop_stats_read(void *port,
+	struct rte_port_out_stats *stats, int clear)
+{
+	struct rte_port_kni_writer_nodrop *p =
+			(struct rte_port_kni_writer_nodrop *) port;
+
+	if (stats != NULL)
+		memcpy(stats, &p->stats, sizeof(p->stats));
+
+	if (clear)
+		memset(&p->stats, 0, sizeof(p->stats));
+
+	return 0;
+}
+
+
+/*
+ * Summary of port operations
+ */
+struct rte_port_in_ops rte_port_kni_reader_ops = {
+	.f_create = rte_port_kni_reader_create,
+	.f_free = rte_port_kni_reader_free,
+	.f_rx = rte_port_kni_reader_rx,
+	.f_stats = rte_port_kni_reader_stats_read,
+};
+
+struct rte_port_out_ops rte_port_kni_writer_ops = {
+	.f_create = rte_port_kni_writer_create,
+	.f_free = rte_port_kni_writer_free,
+	.f_tx = rte_port_kni_writer_tx,
+	.f_tx_bulk = rte_port_kni_writer_tx_bulk,
+	.f_flush = rte_port_kni_writer_flush,
+	.f_stats = rte_port_kni_writer_stats_read,
+};
+
+struct rte_port_out_ops rte_port_kni_writer_nodrop_ops = {
+	.f_create = rte_port_kni_writer_nodrop_create,
+	.f_free = rte_port_kni_writer_nodrop_free,
+	.f_tx = rte_port_kni_writer_nodrop_tx,
+	.f_tx_bulk = rte_port_kni_writer_nodrop_tx_bulk,
+	.f_flush = rte_port_kni_writer_nodrop_flush,
+	.f_stats = rte_port_kni_writer_nodrop_stats_read,
+};
diff --git a/lib/librte_port/rte_port_kni.h b/lib/librte_port/rte_port_kni.h
new file mode 100644
index 0000000..4b60689
--- /dev/null
+++ b/lib/librte_port/rte_port_kni.h
@@ -0,0 +1,95 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 Ethan Zhuang <zhuangwj@gmail.com>.
+ *   Copyright(c) 2016 Intel Corporation.
+ *   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 __INCLUDE_RTE_PORT_KNI_H__
+#define __INCLUDE_RTE_PORT_KNI_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @file
+ * RTE Port KNI Interface
+ *
+ * kni_reader: input port built on top of pre-initialized KNI interface
+ * kni_writer: output port built on top of pre-initialized KNI interface
+ *
+ ***/
+
+#include <stdint.h>
+
+#include <rte_kni.h>
+
+#include "rte_port.h"
+
+/** kni_reader port parameters */
+struct rte_port_kni_reader_params {
+	/** KNI interface reference */
+	struct rte_kni *kni;
+};
+
+/** kni_reader port operations */
+extern struct rte_port_in_ops rte_port_kni_reader_ops;
+
+
+/** kni_writer port parameters */
+struct rte_port_kni_writer_params {
+	/** KNI interface reference */
+	struct rte_kni *kni;
+	/** Burst size to KNI interface. */
+	uint32_t tx_burst_sz;
+};
+
+/** kni_writer port operations */
+extern struct rte_port_out_ops rte_port_kni_writer_ops;
+
+/** kni_writer_nodrop port parameters */
+struct rte_port_kni_writer_nodrop_params {
+	/** KNI interface reference */
+	struct rte_kni *kni;
+	/** Burst size to KNI interface. */
+	uint32_t tx_burst_sz;
+	/** Maximum number of retries, 0 for no limit */
+	uint32_t n_retries;
+};
+
+/** kni_writer_nodrop port operations */
+extern struct rte_port_out_ops rte_port_kni_writer_nodrop_ops;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/librte_port/rte_port_version.map b/lib/librte_port/rte_port_version.map
index 7a0b34d..c528658 100644
--- a/lib/librte_port/rte_port_version.map
+++ b/lib/librte_port/rte_port_version.map
@@ -35,3 +35,12 @@ DPDK_2.2 {
 	rte_port_ring_multi_writer_nodrop_ops;
 
 } DPDK_2.1;
+
+DPDK_16.07 {
+	global:
+
+	rte_port_kni_reader_ops;
+	rte_port_kni_writer_ops;
+	rte_port_kni_writer_nodrop_ops;
+
+} DPDK_2.2;
-- 
2.7.4