[dpdk-dev] [PATCH v2 1/3] lib/librte_port: enable file descriptor port support

[Jasvinder Singh <jasvinder.singh@intel.com>]

This patch adds File Descriptor(FD) port type (e.g. TAP port) to the
packet framework library that allows interface with the kernel network
stack. The FD port APIs are defined that allow port creation, writing
and reading packet from the kernel interface.

Signed-off-by: Jasvinder Singh <jasvinder.singh@intel.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
---
v2:
- fix checkpatch warnings

 lib/librte_port/Makefile             |   2 +
 lib/librte_port/rte_port_fd.c        | 552 +++++++++++++++++++++++++++++++++++
 lib/librte_port/rte_port_fd.h        | 105 +++++++
 lib/librte_port/rte_port_version.map |   9 +
 4 files changed, 668 insertions(+)
 create mode 100644 lib/librte_port/rte_port_fd.c
 create mode 100644 lib/librte_port/rte_port_fd.h

diff --git a/lib/librte_port/Makefile b/lib/librte_port/Makefile
index 3d84a0e..44fa735 100644
--- a/lib/librte_port/Makefile
+++ b/lib/librte_port/Makefile
@@ -56,6 +56,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_frag.c
 SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_ras.c
 endif
 SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_sched.c
+SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_fd.c
 ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
 SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_kni.c
 endif
@@ -70,6 +71,7 @@ SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_frag.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_ras.h
 endif
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_sched.h
+SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_fd.h
 ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_kni.h
 endif
diff --git a/lib/librte_port/rte_port_fd.c b/lib/librte_port/rte_port_fd.c
new file mode 100644
index 0000000..4e4e1de
--- /dev/null
+++ b/lib/librte_port/rte_port_fd.c
@@ -0,0 +1,552 @@
+/*-
+ *   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 <string.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include <rte_mbuf.h>
+#include <rte_malloc.h>
+
+#include "rte_port_fd.h"
+
+/*
+ * Port FD Reader
+ */
+#ifdef RTE_PORT_STATS_COLLECT
+
+#define RTE_PORT_FD_READER_STATS_PKTS_IN_ADD(port, val) \
+	do { port->stats.n_pkts_in += val } while (0)
+#define RTE_PORT_FD_READER_STATS_PKTS_DROP_ADD(port, val) \
+	do { port->stats.n_pkts_drop += val } while (0)
+
+#else
+
+#define RTE_PORT_FD_READER_STATS_PKTS_IN_ADD(port, val)
+#define RTE_PORT_FD_READER_STATS_PKTS_DROP_ADD(port, val)
+
+#endif
+
+struct rte_port_fd_reader {
+	struct rte_port_in_stats stats;
+	int fd;
+	uint32_t mtu;
+	struct rte_mempool *mempool;
+};
+
+static void *
+rte_port_fd_reader_create(void *params, int socket_id)
+{
+	struct rte_port_fd_reader_params *conf =
+			(struct rte_port_fd_reader_params *) params;
+	struct rte_port_fd_reader *port;
+
+	/* Check input parameters */
+	if (conf == NULL) {
+		RTE_LOG(ERR, PORT, "%s: params is NULL\n", __func__);
+		return NULL;
+	}
+	if (conf->fd < 0) {
+		RTE_LOG(ERR, PORT, "%s: Invalid file descriptor\n", __func__);
+		return NULL;
+	}
+	if (conf->mtu == 0) {
+		RTE_LOG(ERR, PORT, "%s: Invalid MTU\n", __func__);
+		return NULL;
+	}
+	if (conf->mempool == NULL) {
+		RTE_LOG(ERR, PORT, "%s: Invalid mempool\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->fd = conf->fd;
+	port->mtu = conf->mtu;
+	port->mempool = conf->mempool;
+
+	return port;
+}
+
+static int
+rte_port_fd_reader_rx(void *port, struct rte_mbuf **pkts, uint32_t n_pkts)
+{
+	struct rte_port_fd_reader *p = (struct rte_port_fd_reader *) port;
+	uint32_t i;
+
+	if (rte_mempool_get_bulk(p->mempool, (void **) pkts, n_pkts) != 0)
+		return 0;
+
+	for (i = 0; i < n_pkts; i++) {
+		rte_mbuf_refcnt_set(pkts[i], 1);
+		rte_pktmbuf_reset(pkts[i]);
+	}
+
+	for (i = 0; i < n_pkts; i++) {
+		struct rte_mbuf *pkt = pkts[i];
+		void *pkt_data = rte_pktmbuf_mtod(pkt, void *);
+		ssize_t n_bytes;
+
+		n_bytes = read(p->fd, pkt_data, (size_t) p->mtu);
+		if (n_bytes <= 0)
+			break;
+
+		pkt->data_len = n_bytes;
+		pkt->pkt_len = n_bytes;
+	}
+
+	for ( ; i < n_pkts; i++)
+		rte_pktmbuf_free(pkts[i]);
+
+	RTE_PORT_FD_READER_STATS_PKTS_IN_ADD(p, i);
+
+	return n_pkts;
+}
+
+static int
+rte_port_fd_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_fd_reader_stats_read(void *port,
+		struct rte_port_in_stats *stats, int clear)
+{
+	struct rte_port_fd_reader *p =
+			(struct rte_port_fd_reader *) port;
+
+	if (stats != NULL)
+		memcpy(stats, &p->stats, sizeof(p->stats));
+
+	if (clear)
+		memset(&p->stats, 0, sizeof(p->stats));
+
+	return 0;
+}
+
+/*
+ * Port FD Writer
+ */
+#ifdef RTE_PORT_STATS_COLLECT
+
+#define RTE_PORT_FD_WRITER_STATS_PKTS_IN_ADD(port, val) \
+	do { port->stats.n_pkts_in += val } while (0)
+#define RTE_PORT_FD_WRITER_STATS_PKTS_DROP_ADD(port, val) \
+	do { port->stats.n_pkts_drop += val } while (0)
+
+#else
+
+#define RTE_PORT_FD_WRITER_STATS_PKTS_IN_ADD(port, val)
+#define RTE_PORT_FD_WRITER_STATS_PKTS_DROP_ADD(port, val)
+
+#endif
+
+struct rte_port_fd_writer {
+	struct rte_port_out_stats stats;
+
+	struct rte_mbuf *tx_buf[2 * RTE_PORT_IN_BURST_SIZE_MAX];
+	uint32_t tx_burst_sz;
+	uint16_t tx_buf_count;
+	uint32_t fd;
+};
+
+static void *
+rte_port_fd_writer_create(void *params, int socket_id)
+{
+	struct rte_port_fd_writer_params *conf =
+		(struct rte_port_fd_writer_params *) params;
+	struct rte_port_fd_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->fd = conf->fd;
+	port->tx_burst_sz = conf->tx_burst_sz;
+	port->tx_buf_count = 0;
+
+	return port;
+}
+
+static inline void
+send_burst(struct rte_port_fd_writer *p)
+{
+	uint32_t i;
+
+	for (i = 0; i < p->tx_buf_count; i++) {
+		struct rte_mbuf *pkt = p->tx_buf[i];
+		void *pkt_data = rte_pktmbuf_mtod(pkt, void*);
+		size_t n_bytes = rte_pktmbuf_data_len(pkt);
+		ssize_t ret;
+
+		ret = write(p->fd, pkt_data, n_bytes);
+		if (ret < 0)
+			break;
+	}
+
+	RTE_PORT_FD_WRITER_STATS_PKTS_DROP_ADD(p, p->tx_buf_count - i);
+
+	for (i = 0; i < p->tx_buf_count; i++)
+		rte_pktmbuf_free(p->tx_buf[i]);
+
+	p->tx_buf_count = 0;
+}
+
+static int
+rte_port_fd_writer_tx(void *port, struct rte_mbuf *pkt)
+{
+	struct rte_port_fd_writer *p =
+		(struct rte_port_fd_writer *) port;
+
+	p->tx_buf[p->tx_buf_count++] = pkt;
+	RTE_PORT_FD_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_fd_writer_tx_bulk(void *port,
+	struct rte_mbuf **pkts,
+	uint64_t pkts_mask)
+{
+	struct rte_port_fd_writer *p =
+		(struct rte_port_fd_writer *) port;
+	uint32_t tx_buf_count = p->tx_buf_count;
+
+	if ((pkts_mask & (pkts_mask + 1)) == 0) {
+		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
+		uint32_t i;
+
+		for (i = 0; i < n_pkts; i++)
+			p->tx_buf[tx_buf_count++] = pkts[i];
+		RTE_PORT_FD_WRITER_STATS_PKTS_IN_ADD(p, n_pkts);
+	} 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_FD_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_fd_writer_flush(void *port)
+{
+	struct rte_port_fd_writer *p =
+		(struct rte_port_fd_writer *) port;
+
+	if (p->tx_buf_count > 0)
+		send_burst(p);
+
+	return 0;
+}
+
+static int
+rte_port_fd_writer_free(void *port)
+{
+	if (port == NULL) {
+		RTE_LOG(ERR, PORT, "%s: Port is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	rte_port_fd_writer_flush(port);
+	rte_free(port);
+
+	return 0;
+}
+
+static int rte_port_fd_writer_stats_read(void *port,
+		struct rte_port_out_stats *stats, int clear)
+{
+	struct rte_port_fd_writer *p =
+		(struct rte_port_fd_writer *) port;
+
+	if (stats != NULL)
+		memcpy(stats, &p->stats, sizeof(p->stats));
+
+	if (clear)
+		memset(&p->stats, 0, sizeof(p->stats));
+
+	return 0;
+}
+
+/*
+ * Port FD Writer Nodrop
+ */
+#ifdef RTE_PORT_STATS_COLLECT
+
+#define RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_IN_ADD(port, val) \
+	do { port->stats.n_pkts_in += val } while (0)
+#define RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_DROP_ADD(port, val) \
+	do { port->stats.n_pkts_drop += val } while (0)
+
+#else
+
+#define RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_IN_ADD(port, val)
+#define RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_DROP_ADD(port, val)
+
+#endif
+
+struct rte_port_fd_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;
+	uint16_t tx_buf_count;
+	uint64_t n_retries;
+	uint32_t fd;
+};
+
+static void *
+rte_port_fd_writer_nodrop_create(void *params, int socket_id)
+{
+	struct rte_port_fd_writer_nodrop_params *conf =
+			(struct rte_port_fd_writer_nodrop_params *) params;
+	struct rte_port_fd_writer_nodrop *port;
+
+	/* Check input parameters */
+	if ((conf == NULL) ||
+		(conf->fd < 0) ||
+		(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->fd = conf->fd;
+	port->tx_burst_sz = conf->tx_burst_sz;
+	port->tx_buf_count = 0;
+
+	/*
+	 * 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_fd_writer_nodrop *p)
+{
+	uint64_t n_retries;
+	uint32_t i;
+
+	n_retries = 0;
+	for (i = 0; (i < p->tx_buf_count) && (n_retries < p->n_retries); i++) {
+		struct rte_mbuf *pkt = p->tx_buf[i];
+		void *pkt_data = rte_pktmbuf_mtod(pkt, void*);
+		size_t n_bytes = rte_pktmbuf_data_len(pkt);
+
+		for ( ; n_retries < p->n_retries; n_retries++) {
+			ssize_t ret;
+
+			ret = write(p->fd, pkt_data, n_bytes);
+			if (ret)
+				break;
+		}
+	}
+
+	RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_DROP_ADD(p, p->tx_buf_count - i);
+
+	for (i = 0; i < p->tx_buf_count; i++)
+		rte_pktmbuf_free(p->tx_buf[i]);
+
+	p->tx_buf_count = 0;
+}
+
+static int
+rte_port_fd_writer_nodrop_tx(void *port, struct rte_mbuf *pkt)
+{
+	struct rte_port_fd_writer_nodrop *p =
+		(struct rte_port_fd_writer_nodrop *) port;
+
+	p->tx_buf[p->tx_buf_count++] = pkt;
+	RTE_PORT_FD_WRITER_NODROP_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_fd_writer_nodrop_tx_bulk(void *port,
+	struct rte_mbuf **pkts,
+	uint64_t pkts_mask)
+{
+	struct rte_port_fd_writer_nodrop *p =
+		(struct rte_port_fd_writer_nodrop *) port;
+	uint32_t tx_buf_count = p->tx_buf_count;
+
+	if ((pkts_mask & (pkts_mask + 1)) == 0) {
+		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
+		uint32_t i;
+
+		for (i = 0; i < n_pkts; i++)
+			p->tx_buf[tx_buf_count++] = pkts[i];
+		RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_IN_ADD(p, n_pkts);
+	} 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_FD_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_fd_writer_nodrop_flush(void *port)
+{
+	struct rte_port_fd_writer_nodrop *p =
+		(struct rte_port_fd_writer_nodrop *) port;
+
+	if (p->tx_buf_count > 0)
+		send_burst_nodrop(p);
+
+	return 0;
+}
+
+static int
+rte_port_fd_writer_nodrop_free(void *port)
+{
+	if (port == NULL) {
+		RTE_LOG(ERR, PORT, "%s: Port is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	rte_port_fd_writer_nodrop_flush(port);
+	rte_free(port);
+
+return 0;
+}
+
+static int rte_port_fd_writer_nodrop_stats_read(void *port,
+		struct rte_port_out_stats *stats, int clear)
+{
+	struct rte_port_fd_writer_nodrop *p =
+		(struct rte_port_fd_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_fd_reader_ops = {
+	.f_create = rte_port_fd_reader_create,
+	.f_free = rte_port_fd_reader_free,
+	.f_rx = rte_port_fd_reader_rx,
+	.f_stats = rte_port_fd_reader_stats_read,
+};
+
+struct rte_port_out_ops rte_port_fd_writer_ops = {
+	.f_create = rte_port_fd_writer_create,
+	.f_free = rte_port_fd_writer_free,
+	.f_tx = rte_port_fd_writer_tx,
+	.f_tx_bulk = rte_port_fd_writer_tx_bulk,
+	.f_flush = rte_port_fd_writer_flush,
+	.f_stats = rte_port_fd_writer_stats_read,
+};
+
+struct rte_port_out_ops rte_port_fd_writer_nodrop_ops = {
+	.f_create = rte_port_fd_writer_nodrop_create,
+	.f_free = rte_port_fd_writer_nodrop_free,
+	.f_tx = rte_port_fd_writer_nodrop_tx,
+	.f_tx_bulk = rte_port_fd_writer_nodrop_tx_bulk,
+	.f_flush = rte_port_fd_writer_nodrop_flush,
+	.f_stats = rte_port_fd_writer_nodrop_stats_read,
+};
diff --git a/lib/librte_port/rte_port_fd.h b/lib/librte_port/rte_port_fd.h
new file mode 100644
index 0000000..b9ae8e4
--- /dev/null
+++ b/lib/librte_port/rte_port_fd.h
@@ -0,0 +1,105 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __INCLUDE_RTE_PORT_FD_H__
+#define __INCLUDE_RTE_PORT_FD_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @file
+ * RTE Port FD Device
+ *
+ * fd_reader: input port built on top of valid non-blocking file descriptor
+ * fd_writer: output port built on top of valid non-blocking file descriptor
+ *
+ ***/
+
+#include <stdint.h>
+
+#include <rte_mempool.h>
+#include "rte_port.h"
+
+/** fd_reader port parameters */
+struct rte_port_fd_reader_params {
+	/** File descriptor */
+	int fd;
+
+	/** Maximum Transfer Unit (MTU) */
+	uint32_t mtu;
+
+	/** Pre-initialized buffer pool */
+	struct rte_mempool *mempool;
+};
+
+/** fd_reader port operations */
+extern struct rte_port_in_ops rte_port_fd_reader_ops;
+
+/** fd_writer port parameters */
+struct rte_port_fd_writer_params {
+	/** File descriptor */
+	int fd;
+
+	/**< Recommended write burst size. The actual burst size can be
+	 * bigger or smaller than this value.
+	 */
+	uint32_t tx_burst_sz;
+};
+
+/** fd_writer port operations */
+extern struct rte_port_out_ops rte_port_fd_writer_ops;
+
+/** fd_writer_nodrop port parameters */
+struct rte_port_fd_writer_nodrop_params {
+	/** File descriptor */
+	int fd;
+
+	/**< Recommended write burst size. The actual burst size can be
+	 * bigger or smaller than this value.
+	 */
+	uint32_t tx_burst_sz;
+
+	/** Maximum number of retries, 0 for no limit */
+	uint32_t n_retries;
+};
+
+/** fd_writer_nodrop port operations */
+extern struct rte_port_out_ops rte_port_fd_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 048c20d..6470629 100644
--- a/lib/librte_port/rte_port_version.map
+++ b/lib/librte_port/rte_port_version.map
@@ -42,3 +42,12 @@ DPDK_16.07 {
 	rte_port_kni_writer_nodrop_ops;
 
 } DPDK_2.2;
+
+DPDK_16.11 {
+	global:
+
+	rte_port_fd_reader_ops;
+	rte_port_fd_writer_ops;
+	rte_port_fd_writer_nodrop_ops;
+
+} DPDK_16.07;
-- 
2.5.5