Imported Upstream version 16.04

Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

2 files changed, 988 insertions, 0 deletions

diff --git a/examples/netmap_compat/lib/compat_netmap.c b/examples/netmap_compat/lib/compat_netmap.c
new file mode 100644
index 00000000..bf1b418a
--- /dev/null
+++ b/examples/netmap_compat/lib/compat_netmap.c
@@ -0,0 +1,908 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <inttypes.h>
+#include <poll.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <net/if.h>
+#include <sys/types.h>
+#include <sys/resource.h>
+#include <sys/mman.h>
+
+#include <rte_common.h>
+#include <rte_errno.h>
+#include <rte_ethdev.h>
+#include <rte_log.h>
+#include <rte_malloc.h>
+#include <rte_mbuf.h>
+#include <rte_memzone.h>
+#include <rte_spinlock.h>
+#include <rte_string_fns.h>
+
+#include "compat_netmap.h"
+
+struct netmap_port {
+	struct rte_mempool   *pool;
+	struct netmap_if     *nmif;
+	struct rte_eth_conf   eth_conf;
+	struct rte_eth_txconf tx_conf;
+	struct rte_eth_rxconf rx_conf;
+	int32_t  socket_id;
+	uint16_t nr_tx_rings;
+	uint16_t nr_rx_rings;
+	uint32_t nr_tx_slots;
+	uint32_t nr_rx_slots;
+	uint16_t tx_burst;
+	uint16_t rx_burst;
+	uint32_t fd;
+};
+
+struct fd_port {
+	uint32_t port;
+};
+
+#ifndef POLLRDNORM
+#define POLLRDNORM	0x0040
+#endif
+
+#ifndef POLLWRNORM
+#define POLLWRNORM	0x0100
+#endif
+
+#define	FD_PORT_FREE	UINT32_MAX
+#define	FD_PORT_RSRV	(FD_PORT_FREE - 1)
+
+struct netmap_state {
+	struct rte_netmap_conf conf;
+	uintptr_t buf_start;
+	void     *mem;
+	uint32_t  mem_sz;
+	uint32_t  netif_memsz;
+};
+
+
+#define COMPAT_NETMAP_MAX_NOFILE	(2 * RTE_MAX_ETHPORTS)
+#define COMPAT_NETMAP_MAX_BURST		64
+#define COMPAT_NETMAP_MAX_PKT_PER_SYNC	(2 * COMPAT_NETMAP_MAX_BURST)
+
+static struct netmap_port ports[RTE_MAX_ETHPORTS];
+static struct netmap_state netmap;
+
+static struct fd_port fd_port[COMPAT_NETMAP_MAX_NOFILE];
+static const int next_fd_start = RLIMIT_NOFILE + 1;
+static rte_spinlock_t netmap_lock;
+
+#define	IDX_TO_FD(x)	((x) + next_fd_start)
+#define	FD_TO_IDX(x)	((x) - next_fd_start)
+#define	FD_VALID(x)	((x) >= next_fd_start && \
+	(x) < (typeof (x))(RTE_DIM(fd_port) + next_fd_start))
+
+#define	PORT_NUM_RINGS	(2 * netmap.conf.max_rings)
+#define	PORT_NUM_SLOTS	(PORT_NUM_RINGS * netmap.conf.max_slots)
+
+#define	BUF_IDX(port, ring, slot)            \
+	(((port) * PORT_NUM_RINGS + (ring)) * netmap.conf.max_slots + \
+	(slot))
+
+#define NETMAP_IF_RING_OFS(rid, rings, slots)   ({\
+	struct netmap_if *_if;                    \
+	struct netmap_ring *_rg;                  \
+	sizeof(*_if) +                            \
+	(rings) * sizeof(_if->ring_ofs[0]) +      \
+	(rid) * sizeof(*_rg) +                    \
+	(slots) * sizeof(_rg->slot[0]);           \
+	})
+
+static void netmap_unregif(uint32_t idx, uint32_t port);
+
+
+static int32_t
+ifname_to_portid(const char *ifname, uint8_t *port)
+{
+	char *endptr;
+	uint64_t portid;
+
+	errno = 0;
+	portid = strtoul(ifname, &endptr, 10);
+	if (endptr == ifname || *endptr != '\0' ||
+			portid >= RTE_DIM(ports) || errno != 0)
+		return -EINVAL;
+
+	*port = (uint8_t)portid;
+	return 0;
+}
+
+/**
+ * Given a dpdk mbuf, fill in the Netmap slot in ring r and its associated
+ * buffer with the data held by the mbuf.
+ * Note that mbuf chains are not supported.
+ */
+static void
+mbuf_to_slot(struct rte_mbuf *mbuf, struct netmap_ring *r, uint32_t index)
+{
+	char *data;
+	uint16_t length;
+
+	data   = rte_pktmbuf_mtod(mbuf, char *);
+	length = rte_pktmbuf_data_len(mbuf);
+
+	if (length > r->nr_buf_size)
+		length = 0;
+
+	r->slot[index].len = length;
+	rte_memcpy(NETMAP_BUF(r, r->slot[index].buf_idx), data, length);
+}
+
+/**
+ * Given a Netmap ring and a slot index for that ring, construct a dpdk mbuf
+ * from the data held in the buffer associated with the slot.
+ * Allocation/deallocation of the dpdk mbuf are the responsability of the
+ * caller.
+ * Note that mbuf chains are not supported.
+ */
+static void
+slot_to_mbuf(struct netmap_ring *r, uint32_t index, struct rte_mbuf *mbuf)
+{
+	char *data;
+	uint16_t length;
+
+	rte_pktmbuf_reset(mbuf);
+	length = r->slot[index].len;
+	data = rte_pktmbuf_append(mbuf, length);
+
+	if (data != NULL)
+	    rte_memcpy(data, NETMAP_BUF(r, r->slot[index].buf_idx), length);
+}
+
+static int32_t
+fd_reserve(void)
+{
+	uint32_t i;
+
+	for (i = 0; i != RTE_DIM(fd_port) && fd_port[i].port != FD_PORT_FREE;
+			i++)
+		;
+
+	if (i == RTE_DIM(fd_port))
+		return -ENOMEM;
+
+	fd_port[i].port = FD_PORT_RSRV;
+	return IDX_TO_FD(i);
+}
+
+static int32_t
+fd_release(int32_t fd)
+{
+	uint32_t idx, port;
+
+	idx = FD_TO_IDX(fd);
+
+	if (!FD_VALID(fd) || (port = fd_port[idx].port) == FD_PORT_FREE)
+		return -EINVAL;
+
+	/* if we still have a valid port attached, release the port */
+	if (port < RTE_DIM(ports) && ports[port].fd == idx) {
+		netmap_unregif(idx, port);
+	}
+
+	fd_port[idx].port = FD_PORT_FREE;
+	return 0;
+}
+
+static int
+check_nmreq(struct nmreq *req, uint8_t *port)
+{
+	int32_t rc;
+	uint8_t portid;
+
+	if (req == NULL)
+		return -EINVAL;
+
+	if (req->nr_version != NETMAP_API) {
+		req->nr_version = NETMAP_API;
+		return -EINVAL;
+	}
+
+	if ((rc = ifname_to_portid(req->nr_name, &portid)) != 0) {
+	    	RTE_LOG(ERR, USER1, "Invalid interface name:\"%s\" "
+			"in NIOCGINFO call\n", req->nr_name);
+		return rc;
+	}
+
+	if (ports[portid].pool == NULL) {
+	    	RTE_LOG(ERR, USER1, "Misconfigured portid %hhu\n", portid);
+		return -EINVAL;
+	}
+
+	*port = portid;
+	return 0;
+}
+
+/**
+ * Simulate a Netmap NIOCGINFO ioctl: given a struct nmreq holding an interface
+ * name (a port number in our case), fill the struct nmreq in with advisory
+ * information about the interface: number of rings and their size, total memory
+ * required in the map, ...
+ * Those are preconfigured using rte_eth_{,tx,rx}conf and
+ * rte_netmap_port_conf structures
+ * and calls to rte_netmap_init_port() in the Netmap application.
+ */
+static int
+ioctl_niocginfo(__rte_unused int fd, void * param)
+{
+	uint8_t portid;
+	struct nmreq *req;
+	int32_t rc;
+
+	req = (struct nmreq *)param;
+	if ((rc = check_nmreq(req, &portid)) != 0)
+		return rc;
+
+	req->nr_tx_rings = (uint16_t)(ports[portid].nr_tx_rings - 1);
+	req->nr_rx_rings = (uint16_t)(ports[portid].nr_rx_rings - 1);
+	req->nr_tx_slots = ports[portid].nr_tx_slots;
+	req->nr_rx_slots = ports[portid].nr_rx_slots;
+
+	/* in current implementation we have all NETIFs shared aone region. */
+	req->nr_memsize = netmap.mem_sz;
+	req->nr_offset = 0;
+
+	return 0;
+}
+
+static void
+netmap_ring_setup(struct netmap_ring *ring, uint8_t port, uint32_t ringid,
+	uint32_t num_slots)
+{
+	uint32_t j;
+
+	ring->buf_ofs = netmap.buf_start - (uintptr_t)ring;
+	ring->num_slots = num_slots;
+	ring->cur = 0;
+	ring->reserved = 0;
+	ring->nr_buf_size = netmap.conf.max_bufsz;
+	ring->flags = 0;
+	ring->ts.tv_sec = 0;
+	ring->ts.tv_usec = 0;
+
+	for (j = 0; j < ring->num_slots; j++) {
+		ring->slot[j].buf_idx = BUF_IDX(port, ringid, j);
+		ring->slot[j].len = 0;
+		ring->flags = 0;
+	}
+}
+
+static int
+netmap_regif(struct nmreq *req, uint32_t idx, uint8_t port)
+{
+	struct netmap_if *nmif;
+	struct netmap_ring *ring;
+	uint32_t i, slots, start_ring;
+	int32_t rc;
+
+	if (ports[port].fd < RTE_DIM(fd_port)) {
+	    	RTE_LOG(ERR, USER1, "port %hhu already in use by fd: %u\n",
+			port, IDX_TO_FD(ports[port].fd));
+		return -EBUSY;
+	}
+	if (fd_port[idx].port != FD_PORT_RSRV) {
+	    	RTE_LOG(ERR, USER1, "fd: %u is misconfigured\n",
+			IDX_TO_FD(idx));
+		return -EBUSY;
+	}
+
+	nmif = ports[port].nmif;
+
+	/* setup netmap_if fields. */
+	memset(nmif, 0, netmap.netif_memsz);
+
+	/* only ALL rings supported right now. */
+	if (req->nr_ringid != 0)
+		return -EINVAL;
+
+	snprintf(nmif->ni_name, sizeof(nmif->ni_name), "%s", req->nr_name);
+	nmif->ni_version  = req->nr_version;
+
+	/* Netmap uses ni_(r|t)x_rings + 1 */
+	nmif->ni_rx_rings = ports[port].nr_rx_rings - 1;
+	nmif->ni_tx_rings = ports[port].nr_tx_rings - 1;
+
+	/*
+	 * Setup TX rings and slots.
+	 * Refer to the comments in netmap.h for details
+	 */
+
+	slots = 0;
+	for (i = 0; i < nmif->ni_tx_rings + 1; i++) {
+
+		nmif->ring_ofs[i] = NETMAP_IF_RING_OFS(i,
+			PORT_NUM_RINGS, slots);
+
+		ring = NETMAP_TXRING(nmif, i);
+		netmap_ring_setup(ring, port, i, ports[port].nr_tx_slots);
+		ring->avail = ring->num_slots;
+
+		slots += ports[port].nr_tx_slots;
+	}
+
+	/*
+	 * Setup  RX rings and slots.
+	 * Refer to the comments in netmap.h for details
+	 */
+
+	start_ring = i;
+
+	for (; i < nmif->ni_rx_rings + 1 + start_ring; i++) {
+
+		nmif->ring_ofs[i] = NETMAP_IF_RING_OFS(i,
+			PORT_NUM_RINGS, slots);
+
+		ring = NETMAP_RXRING(nmif, (i - start_ring));
+		netmap_ring_setup(ring, port, i, ports[port].nr_rx_slots);
+		ring->avail = 0;
+
+		slots += ports[port].nr_rx_slots;
+	}
+
+	if ((rc = rte_eth_dev_start(port)) < 0) {
+		RTE_LOG(ERR, USER1,
+			"Couldn't start ethernet device %s (error %d)\n",
+			req->nr_name, rc);
+	    return rc;
+	}
+
+	/* setup fdi <--> port relationtip. */
+	ports[port].fd = idx;
+	fd_port[idx].port = port;
+
+	req->nr_memsize = netmap.mem_sz;
+	req->nr_offset = (uintptr_t)nmif - (uintptr_t)netmap.mem;
+
+	return 0;
+}
+
+/**
+ * Simulate a Netmap NIOCREGIF ioctl:
+ */
+static int
+ioctl_niocregif(int32_t fd, void * param)
+{
+	uint8_t portid;
+	int32_t rc;
+	uint32_t idx;
+	struct nmreq *req;
+
+	req = (struct nmreq *)param;
+	if ((rc = check_nmreq(req, &portid)) != 0)
+		return rc;
+
+	idx = FD_TO_IDX(fd);
+
+	rte_spinlock_lock(&netmap_lock);
+	rc = netmap_regif(req, idx, portid);
+	rte_spinlock_unlock(&netmap_lock);
+
+	return rc;
+}
+
+static void
+netmap_unregif(uint32_t idx, uint32_t port)
+{
+	fd_port[idx].port = FD_PORT_RSRV;
+	ports[port].fd = UINT32_MAX;
+	rte_eth_dev_stop((uint8_t)port);
+}
+
+/**
+ * Simulate a Netmap NIOCUNREGIF ioctl: put an interface running in Netmap
+ * mode back in "normal" mode. In our case, we just stop the port associated
+ * with this file descriptor.
+ */
+static int
+ioctl_niocunregif(int fd)
+{
+	uint32_t idx, port;
+	int32_t rc;
+
+	idx = FD_TO_IDX(fd);
+
+	rte_spinlock_lock(&netmap_lock);
+
+	port = fd_port[idx].port;
+	if (port < RTE_DIM(ports) && ports[port].fd == idx) {
+		netmap_unregif(idx, port);
+		rc = 0;
+	} else {
+		RTE_LOG(ERR, USER1,
+			"%s: %d is not associated with valid port\n",
+			__func__, fd);
+		rc = -EINVAL;
+	}
+
+	rte_spinlock_unlock(&netmap_lock);
+	return rc;
+}
+
+/**
+ * A call to rx_sync_ring will try to fill a Netmap RX ring with as many
+ * packets as it can hold coming from its dpdk port.
+ */
+static inline int
+rx_sync_ring(struct netmap_ring *ring, uint8_t port, uint16_t ring_number,
+	uint16_t max_burst)
+{
+	int32_t i, n_rx;
+	uint16_t burst_size;
+	uint32_t cur_slot, n_free_slots;
+	struct rte_mbuf *rx_mbufs[COMPAT_NETMAP_MAX_BURST];
+
+	n_free_slots = ring->num_slots - (ring->avail + ring->reserved);
+	n_free_slots = RTE_MIN(n_free_slots, max_burst);
+	cur_slot = (ring->cur + ring->avail) & (ring->num_slots - 1);
+
+	while (n_free_slots) {
+		burst_size = (uint16_t)RTE_MIN(n_free_slots, RTE_DIM(rx_mbufs));
+
+		/* receive up to burst_size packets from the NIC's queue */
+		n_rx = rte_eth_rx_burst(port, ring_number, rx_mbufs,
+			burst_size);
+
+		if (n_rx == 0)
+			return 0;
+		if (unlikely(n_rx < 0))
+			return -1;
+
+		/* Put those n_rx packets in the Netmap structures */
+		for (i = 0; i < n_rx ; i++) {
+			mbuf_to_slot(rx_mbufs[i], ring, cur_slot);
+			rte_pktmbuf_free(rx_mbufs[i]);
+			cur_slot = NETMAP_RING_NEXT(ring, cur_slot);
+		}
+
+		/* Update the Netmap ring structure to reflect the change */
+		ring->avail += n_rx;
+		n_free_slots -= n_rx;
+	}
+
+	return 0;
+}
+
+static inline int
+rx_sync_if(uint32_t port)
+{
+	uint16_t burst;
+	uint32_t i, rc;
+	struct netmap_if *nifp;
+	struct netmap_ring *r;
+
+	nifp = ports[port].nmif;
+	burst = ports[port].rx_burst;
+	rc = 0;
+
+	for (i = 0; i < nifp->ni_rx_rings + 1; i++) {
+		r = NETMAP_RXRING(nifp, i);
+		rx_sync_ring(r, (uint8_t)port, (uint16_t)i, burst);
+		rc += r->avail;
+	}
+
+	return rc;
+}
+
+/**
+ * Simulate a Netmap NIOCRXSYNC ioctl:
+ */
+static int
+ioctl_niocrxsync(int fd)
+{
+	uint32_t idx, port;
+
+	idx = FD_TO_IDX(fd);
+	if ((port = fd_port[idx].port) < RTE_DIM(ports) &&
+			ports[port].fd == idx) {
+		return rx_sync_if(fd_port[idx].port);
+	} else  {
+		return -EINVAL;
+	}
+}
+
+/**
+ * A call to tx_sync_ring will try to empty a Netmap TX ring by converting its
+ * buffers into rte_mbufs and sending them out on the rings's dpdk port.
+ */
+static int
+tx_sync_ring(struct netmap_ring *ring, uint8_t port, uint16_t ring_number,
+	struct rte_mempool *pool, uint16_t max_burst)
+{
+	uint32_t i, n_tx;
+	uint16_t burst_size;
+	uint32_t cur_slot, n_used_slots;
+	struct rte_mbuf *tx_mbufs[COMPAT_NETMAP_MAX_BURST];
+
+	n_used_slots = ring->num_slots - ring->avail;
+	n_used_slots = RTE_MIN(n_used_slots, max_burst);
+	cur_slot = (ring->cur + ring->avail) & (ring->num_slots - 1);
+
+	while (n_used_slots) {
+		burst_size = (uint16_t)RTE_MIN(n_used_slots, RTE_DIM(tx_mbufs));
+
+		for (i = 0; i < burst_size; i++) {
+			tx_mbufs[i] = rte_pktmbuf_alloc(pool);
+			if (tx_mbufs[i] == NULL)
+				goto err;
+
+			slot_to_mbuf(ring, cur_slot, tx_mbufs[i]);
+			cur_slot = NETMAP_RING_NEXT(ring, cur_slot);
+		}
+
+		n_tx = rte_eth_tx_burst(port, ring_number, tx_mbufs,
+			burst_size);
+
+		/* Update the Netmap ring structure to reflect the change */
+		ring->avail += n_tx;
+		n_used_slots -= n_tx;
+
+		/* Return the mbufs that failed to transmit to their pool */
+		if (unlikely(n_tx != burst_size)) {
+			for (i = n_tx; i < burst_size; i++)
+				rte_pktmbuf_free(tx_mbufs[i]);
+	        	break;
+		}
+	}
+
+	return 0;
+
+err:
+	for (; i == 0; --i)
+		rte_pktmbuf_free(tx_mbufs[i]);
+
+	RTE_LOG(ERR, USER1,
+		"Couldn't get mbuf from mempool is the mempool too small?\n");
+	return -1;
+}
+
+static int
+tx_sync_if(uint32_t port)
+{
+	uint16_t burst;
+	uint32_t i, rc;
+	struct netmap_if *nifp;
+	struct netmap_ring *r;
+	struct rte_mempool *mp;
+
+	nifp = ports[port].nmif;
+	mp = ports[port].pool;
+	burst = ports[port].tx_burst;
+	rc = 0;
+
+	for (i = 0; i < nifp->ni_tx_rings + 1; i++) {
+		r = NETMAP_TXRING(nifp, i);
+		tx_sync_ring(r, (uint8_t)port, (uint16_t)i, mp, burst);
+		rc += r->avail;
+	}
+
+	return rc;
+}
+
+/**
+ * Simulate a Netmap NIOCTXSYNC ioctl:
+ */
+static inline int
+ioctl_nioctxsync(int fd)
+{
+	uint32_t idx, port;
+
+	idx = FD_TO_IDX(fd);
+	if ((port = fd_port[idx].port) < RTE_DIM(ports) &&
+			ports[port].fd == idx) {
+		return tx_sync_if(fd_port[idx].port);
+	} else  {
+		return -EINVAL;
+	}
+}
+
+/**
+ * Give the library a mempool of rte_mbufs with which it can do the
+ * rte_mbuf <--> netmap slot conversions.
+ */
+int
+rte_netmap_init(const struct rte_netmap_conf *conf)
+{
+	size_t buf_ofs, nmif_sz, sz;
+	size_t port_rings, port_slots, port_bufs;
+	uint32_t i, port_num;
+
+	port_num = RTE_MAX_ETHPORTS;
+	port_rings = 2 * conf->max_rings;
+	port_slots = port_rings * conf->max_slots;
+	port_bufs = port_slots;
+
+	nmif_sz = NETMAP_IF_RING_OFS(port_rings, port_rings, port_slots);
+	sz = nmif_sz * port_num;
+
+	buf_ofs = RTE_ALIGN_CEIL(sz, RTE_CACHE_LINE_SIZE);
+	sz = buf_ofs + port_bufs * conf->max_bufsz * port_num;
+
+	if (sz > UINT32_MAX ||
+			(netmap.mem = rte_zmalloc_socket(__func__, sz,
+			RTE_CACHE_LINE_SIZE, conf->socket_id)) == NULL) {
+		RTE_LOG(ERR, USER1, "%s: failed to allocate %zu bytes\n",
+			__func__, sz);
+		return -ENOMEM;
+	}
+
+	netmap.mem_sz = sz;
+	netmap.netif_memsz = nmif_sz;
+	netmap.buf_start = (uintptr_t)netmap.mem + buf_ofs;
+	netmap.conf = *conf;
+
+	rte_spinlock_init(&netmap_lock);
+
+	/* Mark all ports as unused and set NETIF pointer. */
+	for (i = 0; i != RTE_DIM(ports); i++) {
+		ports[i].fd = UINT32_MAX;
+		ports[i].nmif = (struct netmap_if *)
+			((uintptr_t)netmap.mem + nmif_sz * i);
+	}
+
+	/* Mark all fd_ports as unused. */
+	for (i = 0; i != RTE_DIM(fd_port); i++) {
+		fd_port[i].port = FD_PORT_FREE;
+	}
+
+	return 0;
+}
+
+
+int
+rte_netmap_init_port(uint8_t portid, const struct rte_netmap_port_conf *conf)
+{
+	int32_t ret;
+	uint16_t i;
+	uint16_t rx_slots, tx_slots;
+
+	if (conf == NULL ||
+			portid >= RTE_DIM(ports) ||
+			conf->nr_tx_rings > netmap.conf.max_rings ||
+			conf->nr_rx_rings > netmap.conf.max_rings) {
+		RTE_LOG(ERR, USER1, "%s(%hhu): invalid parameters\n",
+			__func__, portid);
+		return -EINVAL;
+	}
+
+		rx_slots = (uint16_t)rte_align32pow2(conf->nr_rx_slots);
+		tx_slots = (uint16_t)rte_align32pow2(conf->nr_tx_slots);
+
+	if (tx_slots > netmap.conf.max_slots ||
+			rx_slots > netmap.conf.max_slots) {
+		RTE_LOG(ERR, USER1, "%s(%hhu): invalid parameters\n",
+			__func__, portid);
+		return -EINVAL;
+	}
+
+	ret = rte_eth_dev_configure(portid, conf->nr_rx_rings,
+		conf->nr_tx_rings, conf->eth_conf);
+
+	if (ret < 0) {
+	    RTE_LOG(ERR, USER1, "Couldn't configure port %hhu\n", portid);
+	    return ret;
+	}
+
+	for (i = 0; i < conf->nr_tx_rings; i++) {
+		ret = rte_eth_tx_queue_setup(portid, i, tx_slots,
+			conf->socket_id, NULL);
+
+		if (ret < 0) {
+			RTE_LOG(ERR, USER1,
+				"Couldn't configure TX queue %"PRIu16" of "
+				"port %"PRIu8"\n",
+				i, portid);
+			return ret;
+		}
+
+		ret = rte_eth_rx_queue_setup(portid, i, rx_slots,
+			conf->socket_id, NULL, conf->pool);
+
+		if (ret < 0) {
+			RTE_LOG(ERR, USER1,
+				"Couldn't configure RX queue %"PRIu16" of "
+				"port %"PRIu8"\n",
+				i, portid);
+			return ret;
+		}
+	}
+
+	/* copy config to the private storage. */
+	ports[portid].eth_conf = conf->eth_conf[0];
+	ports[portid].pool = conf->pool;
+	ports[portid].socket_id = conf->socket_id;
+	ports[portid].nr_tx_rings = conf->nr_tx_rings;
+	ports[portid].nr_rx_rings = conf->nr_rx_rings;
+	ports[portid].nr_tx_slots = tx_slots;
+	ports[portid].nr_rx_slots = rx_slots;
+	ports[portid].tx_burst = conf->tx_burst;
+	ports[portid].rx_burst = conf->rx_burst;
+
+	return 0;
+}
+
+int
+rte_netmap_close(__rte_unused int fd)
+{
+	int32_t rc;
+
+	rte_spinlock_lock(&netmap_lock);
+	rc = fd_release(fd);
+	rte_spinlock_unlock(&netmap_lock);
+
+	if (rc < 0) {
+		errno =-rc;
+		rc = -1;
+	}
+	return rc;
+}
+
+int rte_netmap_ioctl(int fd, uint32_t op, void *param)
+{
+	int ret;
+
+	if (!FD_VALID(fd)) {
+	    errno = EBADF;
+	    return -1;
+	}
+
+	switch (op) {
+
+	    case NIOCGINFO:
+	        ret = ioctl_niocginfo(fd, param);
+	        break;
+
+	    case NIOCREGIF:
+	        ret = ioctl_niocregif(fd, param);
+	        break;
+
+	    case NIOCUNREGIF:
+	        ret = ioctl_niocunregif(fd);
+	        break;
+
+	    case NIOCRXSYNC:
+	        ret = ioctl_niocrxsync(fd);
+	        break;
+
+	    case NIOCTXSYNC:
+	        ret = ioctl_nioctxsync(fd);
+	        break;
+
+	    default:
+	        ret = -ENOTTY;
+	}
+
+	if (ret < 0) {
+		errno = -ret;
+		ret = -1;
+	} else {
+		ret = 0;
+	}
+
+	return ret;
+}
+
+void *
+rte_netmap_mmap(void *addr, size_t length,
+	int prot, int flags, int fd, off_t offset)
+{
+	static const int cprot = PROT_WRITE | PROT_READ;
+
+	if (!FD_VALID(fd) || length + offset > netmap.mem_sz ||
+			(prot & cprot) != cprot ||
+			((flags & MAP_FIXED) != 0 && addr != NULL)) {
+
+		errno = EINVAL;
+		return MAP_FAILED;
+	}
+
+	return (void *)((uintptr_t)netmap.mem + (uintptr_t)offset);
+}
+
+/**
+ * Return a "fake" file descriptor with a value above RLIMIT_NOFILE so that
+ * any attempt to use that file descriptor with the usual API will fail.
+ */
+int
+rte_netmap_open(__rte_unused const char *pathname, __rte_unused int flags)
+{
+	int fd;
+
+	rte_spinlock_lock(&netmap_lock);
+	fd = fd_reserve();
+	rte_spinlock_unlock(&netmap_lock);
+
+	if (fd < 0) {
+		errno = -fd;
+		fd = -1;
+	}
+	return fd;
+}
+
+/**
+ * Doesn't support timeout other than 0 or infinite (negative) timeout
+ */
+int
+rte_netmap_poll(struct pollfd *fds, nfds_t nfds, int timeout)
+{
+	int32_t count_it, ret;
+	uint32_t i, idx, port;
+	uint32_t want_rx, want_tx;
+
+	ret = 0;
+	do {
+		for (i = 0; i < nfds; i++) {
+
+			count_it = 0;
+
+			if (!FD_VALID(fds[i].fd) || fds[i].events == 0) {
+				fds[i].revents = 0;
+				continue;
+			}
+
+			idx = FD_TO_IDX(fds[i].fd);
+			if ((port = fd_port[idx].port) >= RTE_DIM(ports) ||
+		ports[port].fd != idx) {
+
+				fds[i].revents |= POLLERR;
+				ret++;
+				continue;
+			}
+
+			want_rx = fds[i].events & (POLLIN  | POLLRDNORM);
+			want_tx = fds[i].events & (POLLOUT | POLLWRNORM);
+
+			if (want_rx && rx_sync_if(port) > 0) {
+				fds[i].revents = (uint16_t)
+					(fds[i].revents | want_rx);
+				count_it = 1;
+			}
+			if (want_tx && tx_sync_if(port) > 0) {
+				fds[i].revents = (uint16_t)
+					(fds[i].revents | want_tx);
+				count_it = 1;
+			}
+
+			ret += count_it;
+		}
+	}
+	while ((ret == 0 && timeout < 0) || timeout);
+
+	return ret;
+}
diff --git a/examples/netmap_compat/lib/compat_netmap.h b/examples/netmap_compat/lib/compat_netmap.h
new file mode 100644
index 00000000..3dc7a2f4
--- /dev/null
+++ b/examples/netmap_compat/lib/compat_netmap.h
@@ -0,0 +1,80 @@
+/*-
+ *   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 _RTE_COMPAT_NETMAP_H_
+
+#include <poll.h>
+#include <linux/ioctl.h>
+#include <net/if.h>
+
+#include <rte_ethdev.h>
+#include <rte_mempool.h>
+
+#include "netmap.h"
+#include "netmap_user.h"
+
+/**
+ * One can overwrite Netmap macros here as needed
+ */
+
+struct rte_netmap_conf {
+	int32_t  socket_id;
+	uint32_t max_rings; /* number of rings(queues) per netmap_if(port) */
+	uint32_t max_slots; /* number of slots(descriptors) per netmap ring. */
+	uint16_t max_bufsz; /* size of each netmap buffer. */
+};
+
+struct rte_netmap_port_conf {
+	struct rte_eth_conf   *eth_conf;
+	struct rte_mempool    *pool;
+	int32_t socket_id;
+	uint16_t nr_tx_rings;
+	uint16_t nr_rx_rings;
+	uint32_t nr_tx_slots;
+	uint32_t nr_rx_slots;
+	uint16_t tx_burst;
+	uint16_t rx_burst;
+};
+
+int rte_netmap_init(const struct rte_netmap_conf *conf);
+int rte_netmap_init_port(uint8_t portid,
+	const struct rte_netmap_port_conf *conf);
+
+int rte_netmap_close(int fd);
+int rte_netmap_ioctl(int fd, uint32_t op, void *param);
+int rte_netmap_open(const char *pathname, int flags);
+int rte_netmap_poll(struct pollfd *fds, nfds_t nfds, int timeout);
+void *rte_netmap_mmap(void *addr, size_t length, int prot, int flags, int fd,
+	                  off_t offset);
+
+#endif /* _RTE_COMPAT_NETMAP_H_ */