[RFC,v3] /net: memory interface (memif)

diff --git a/config/common_base b/config/common_base
index d12ae98bc..b8ed10ae5 100644
--- a/config/common_base
+++ b/config/common_base
@@ -403,6 +403,11 @@  CONFIG_RTE_LIBRTE_VMXNET3_DEBUG_TX_FREE=n
 #
 CONFIG_RTE_LIBRTE_PMD_AF_PACKET=n
 
+#
+# Compile Memory Interface PMD driver (Linux only)
+#
+CONFIG_RTE_LIBRTE_PMD_MEMIF=n
+
 #
 # Compile link bonding PMD library
 #
diff --git a/config/common_linuxapp b/config/common_linuxapp
index 6c1c8d0f4..42cbde8f5 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -18,6 +18,7 @@  CONFIG_RTE_LIBRTE_VHOST_POSTCOPY=n
 CONFIG_RTE_LIBRTE_PMD_VHOST=y
 CONFIG_RTE_LIBRTE_IFC_PMD=y
 CONFIG_RTE_LIBRTE_PMD_AF_PACKET=y
+CONFIG_RTE_LIBRTE_PMD_MEMIF=y
 CONFIG_RTE_LIBRTE_PMD_SOFTNIC=y
 CONFIG_RTE_LIBRTE_PMD_TAP=y
 CONFIG_RTE_LIBRTE_AVP_PMD=y
diff --git a/doc/guides/nics/memif.rst b/doc/guides/nics/memif.rst
new file mode 100644
index 000000000..55d477840
--- /dev/null
+++ b/doc/guides/nics/memif.rst
@@ -0,0 +1,80 @@ 
+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright(c) 2018 Cisco Systems, Inc.
+
+Memif Poll Mode Driver
+======================
+
+Memif PMD allows for DPDK and any other client using memif (DPDK, VPP, libmemif) to
+communicate using shared memory.
+
+The created device, transmits packets in a raw format. It can be used with Ethernet
+mode, IP mode, or Punt/Inject. At this moment, only Ethernet mode is supported in
+DPDK memif implementation.
+
+The method to enable one or more interfaces is to use the
+``--vdev=net_memif0`` option on the DPDK application command line. Each
+``--vdev=net_memif1`` option given will create an interface named net_memif0, net_memif1,
+and so on.  Memif uses unix domain socket to transmit control messages.
+Each memif has a unique id per socket. If you are connecting multiple
+interfaces using same socket, be sure to specify unique ids ``id=0``, ``id=1``, etc.
+Note that if you assign a socket to a master interface it becomes a listener socket.
+Listener socket can not be used by a slave interface on same client.
+
+Memif works in two roles: master and slave. Slave connects to master over an existing
+socket. It is also a producer of shared memory file and initializes the shared memory.
+Master creates the socket and listens for any slave connection requests. The socket may
+already exist on the system. Be sure to remove any such sockets, if you are
+creating a master interface, or you will see an "Address already in use" error. Function
+``rte_pmd_memif_remove()``, which removes memif interface, will also remove a listener socket,
+if  it is not beeing used by any other interface.
+
+.. csv-table:: Memif configuration options:
+   :header: "Option", "Description", "Default"
+
+   "id=0", "Each memif on same socket must be given a unique id", 0
+   "role=master", "Set memif role", slave
+   "bsize=1024", "Size of packet buffer", 2048
+   "rsize=11", "Log2 of ring size. If rsize is 10, actual ring size is 1024", 10
+   "nrxq=2", "Number of RX queues", 1
+   "ntxq=2", "Number of TX queues", 1
+   "socket=/tmp/memif.sock", "Socket filename", "/tmp/memif.sock"
+   "mac=01:23:45:ab:cd:ef", "Mac address", "01:ab:23:cd:45:ef"
+   "secret=abc123", "Secret is an optional security option, which if specified, must be matched by peer",
+    "zero-copy=yes", "Enable/disable zero-copy slave mode", no
+
+Example: testpmd and VPP
+------------------------
+
+For information on how to get and run VPP please see `<https://wiki.fd.io/view/VPP>`_.
+
+Start VPP in interactive mode (should be by default). Create memif master interface in VPP::
+
+    vpp# create interface memif id 0 master no-zero-copy
+    vpp# set interface state memif0/0 up
+    vpp# set interface ip address memif0/0 192.168.1.1/24
+
+To see socket filename use show memif command::
+
+    vpp# show memif
+    sockets
+     id  listener    filename
+      0   yes (1)     /run/vpp/memif.sock
+    ...
+
+Now create memif interface by running testpmd with these command line options::
+
+    #./testpmd --vdev=net_memif,socket=/run/vpp/memif.sock -- -i
+
+Testpmd should now create memif slave interface and try to connect to master.
+In testpmd set forward option to icmpecho and start forwarding::
+
+    testpmd> set fwd icmpecho
+    testpmd> start
+
+Send ping from VPP::
+
+    vpp# ping 192.168.1.2
+    64 bytes from 192.168.1.2: icmp_seq=2 ttl=254 time=36.2918 ms
+    64 bytes from 192.168.1.2: icmp_seq=3 ttl=254 time=23.3927 ms
+    64 bytes from 192.168.1.2: icmp_seq=4 ttl=254 time=24.2975 ms
+    64 bytes from 192.168.1.2: icmp_seq=5 ttl=254 time=17.7049 ms
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index c0386feb9..0feab5241 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -32,6 +32,7 @@  DIRS-$(CONFIG_RTE_LIBRTE_FM10K_PMD) += fm10k
 DIRS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e
 DIRS-$(CONFIG_RTE_LIBRTE_IXGBE_PMD) += ixgbe
 DIRS-$(CONFIG_RTE_LIBRTE_LIO_PMD) += liquidio
+DIRS-$(CONFIG_RTE_LIBRTE_PMD_MEMIF) += memif
 DIRS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += mlx4
 DIRS-$(CONFIG_RTE_LIBRTE_MLX5_PMD) += mlx5
 DIRS-$(CONFIG_RTE_LIBRTE_MVNETA_PMD) += mvneta
diff --git a/drivers/net/memif/Makefile b/drivers/net/memif/Makefile
new file mode 100644
index 000000000..a82448423
--- /dev/null
+++ b/drivers/net/memif/Makefile
@@ -0,0 +1,29 @@ 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright 2018 Cisco Systems, Inc.  All rights reserved.
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+#
+# library name
+#
+LIB = librte_pmd_memif.a
+
+EXPORT_MAP := rte_pmd_memif_version.map
+
+LIBABIVER := 1
+
+CFLAGS += -O3
+CFLAGS += -I$(SRCDIR)
+CFLAGS += $(WERROR_FLAGS)
+CFLAGS += -Wno-pointer-arith
+LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring
+LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs
+LDLIBS += -lrte_bus_vdev
+
+#
+# all source are stored in SRCS-y
+#
+SRCS-$(CONFIG_RTE_LIBRTE_PMD_MEMIF) += rte_eth_memif.c
+SRCS-$(CONFIG_RTE_LIBRTE_PMD_MEMIF) += memif_socket.c
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/drivers/net/memif/memif.h b/drivers/net/memif/memif.h
new file mode 100644
index 000000000..8b759d74b
--- /dev/null
+++ b/drivers/net/memif/memif.h
@@ -0,0 +1,143 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 Cisco Systems, Inc.  All rights reserved.
+ */
+
+#ifndef _MEMIF_H_
+#define _MEMIF_H_
+
+#ifndef MEMIF_CACHELINE_SIZE
+#define MEMIF_CACHELINE_SIZE 64
+#endif
+
+#define MEMIF_COOKIE		0x3E31F20
+#define MEMIF_VERSION_MAJOR	2
+#define MEMIF_VERSION_MINOR	0
+#define MEMIF_VERSION		((MEMIF_VERSION_MAJOR << 8) | MEMIF_VERSION_MINOR)
+
+/*
+ *  Type definitions
+ */
+
+typedef enum memif_msg_type {
+	MEMIF_MSG_TYPE_NONE = 0,
+	MEMIF_MSG_TYPE_ACK = 1,
+	MEMIF_MSG_TYPE_HELLO = 2,
+	MEMIF_MSG_TYPE_INIT = 3,
+	MEMIF_MSG_TYPE_ADD_REGION = 4,
+	MEMIF_MSG_TYPE_ADD_RING = 5,
+	MEMIF_MSG_TYPE_CONNECT = 6,
+	MEMIF_MSG_TYPE_CONNECTED = 7,
+	MEMIF_MSG_TYPE_DISCONNECT = 8,
+} memif_msg_type_t;
+
+typedef enum {
+	MEMIF_RING_S2M = 0,
+	MEMIF_RING_M2S = 1
+} memif_ring_type_t;
+
+typedef enum {
+	MEMIF_INTERFACE_MODE_ETHERNET = 0,
+	MEMIF_INTERFACE_MODE_IP = 1,
+	MEMIF_INTERFACE_MODE_PUNT_INJECT = 2,
+} memif_interface_mode_t;
+
+typedef uint16_t memif_region_index_t;
+typedef uint32_t memif_region_offset_t;
+typedef uint64_t memif_region_size_t;
+typedef uint16_t memif_ring_index_t;
+typedef uint32_t memif_interface_id_t;
+typedef uint16_t memif_version_t;
+typedef uint8_t memif_log2_ring_size_t;
+
+/*
+ *  Socket messages
+ */
+
+typedef struct __attribute__ ((packed)) {
+	uint8_t name[32];
+	memif_version_t min_version;
+	memif_version_t max_version;
+	memif_region_index_t max_region;
+	memif_ring_index_t max_m2s_ring;
+	memif_ring_index_t max_s2m_ring;
+	memif_log2_ring_size_t max_log2_ring_size;
+} memif_msg_hello_t;
+
+typedef struct __attribute__ ((packed)) {
+	memif_version_t version;
+	memif_interface_id_t id;
+	memif_interface_mode_t mode:8;
+	uint8_t secret[24];
+	uint8_t name[32];
+} memif_msg_init_t;
+
+typedef struct __attribute__ ((packed)) {
+	memif_region_index_t index;
+	memif_region_size_t size;
+} memif_msg_add_region_t;
+
+typedef struct __attribute__ ((packed)) {
+	uint16_t flags;
+#define MEMIF_MSG_ADD_RING_FLAG_S2M	(1 << 0)
+	memif_ring_index_t index;
+	memif_region_index_t region;
+	memif_region_offset_t offset;
+	memif_log2_ring_size_t log2_ring_size;
+	uint16_t private_hdr_size;	/* used for private metadata */
+} memif_msg_add_ring_t;
+
+typedef struct __attribute__ ((packed)) {
+	uint8_t if_name[32];
+} memif_msg_connect_t;
+
+typedef struct __attribute__ ((packed)) {
+	uint8_t if_name[32];
+} memif_msg_connected_t;
+
+typedef struct __attribute__ ((packed)) {
+	uint32_t code;
+	uint8_t string[96];
+} memif_msg_disconnect_t;
+
+typedef struct __attribute__ ((packed, aligned(128))) {
+	memif_msg_type_t type:16;
+	union {
+		memif_msg_hello_t hello;
+		memif_msg_init_t init;
+		memif_msg_add_region_t add_region;
+		memif_msg_add_ring_t add_ring;
+		memif_msg_connect_t connect;
+		memif_msg_connected_t connected;
+		memif_msg_disconnect_t disconnect;
+	};
+} memif_msg_t;
+
+/*
+ *  Ring and Descriptor Layout
+ */
+
+typedef struct __attribute__ ((packed)) {
+	uint16_t flags;
+#define MEMIF_DESC_FLAG_NEXT (1 << 0)
+	memif_region_index_t region;
+	uint32_t length;
+	memif_region_offset_t offset;
+	uint32_t metadata;
+} memif_desc_t;
+
+#define MEMIF_CACHELINE_ALIGN_MARK(mark) \
+	uint8_t mark[0] __attribute__((aligned(MEMIF_CACHELINE_SIZE)))
+
+typedef struct {
+	MEMIF_CACHELINE_ALIGN_MARK(cacheline0);
+	uint32_t cookie;
+	uint16_t flags;
+#define MEMIF_RING_FLAG_MASK_INT 1
+	volatile uint16_t head;
+	 MEMIF_CACHELINE_ALIGN_MARK(cacheline1);
+	volatile uint16_t tail;
+	 MEMIF_CACHELINE_ALIGN_MARK(cacheline2);
+	memif_desc_t desc[0];
+} memif_ring_t;
+
+#endif				/* _MEMIF_H_ */
diff --git a/drivers/net/memif/memif_socket.c b/drivers/net/memif/memif_socket.c
new file mode 100644
index 000000000..a66b5741a
--- /dev/null
+++ b/drivers/net/memif/memif_socket.c
@@ -0,0 +1,1093 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 Cisco Systems, Inc.  All rights reserved.
+ */
+
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+
+#include <rte_version.h>
+#include <rte_mbuf.h>
+#include <rte_ether.h>
+#include <rte_ethdev_driver.h>
+#include <rte_ethdev_vdev.h>
+#include <rte_malloc.h>
+#include <rte_kvargs.h>
+#include <rte_bus_vdev.h>
+#include <rte_hash.h>
+#include <rte_jhash.h>
+#include <rte_string_fns.h>
+
+#include <rte_eth_memif.h>
+#include <memif_socket.h>
+
+static void memif_intr_handler(void *arg);
+
+static ssize_t
+memif_msg_send(int fd, memif_msg_t *msg, int afd)
+{
+	struct msghdr mh = { 0 };
+	struct iovec iov[1];
+	char ctl[CMSG_SPACE(sizeof(int))];
+
+	iov[0].iov_base = (void *)msg;
+	iov[0].iov_len = sizeof(memif_msg_t);
+	mh.msg_iov = iov;
+	mh.msg_iovlen = 1;
+
+	if (afd > 0) {
+		struct cmsghdr *cmsg;
+		memset(&ctl, 0, sizeof(ctl));
+		mh.msg_control = ctl;
+		mh.msg_controllen = sizeof(ctl);
+		cmsg = CMSG_FIRSTHDR(&mh);
+		cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+		cmsg->cmsg_level = SOL_SOCKET;
+		cmsg->cmsg_type = SCM_RIGHTS;
+		rte_memcpy(CMSG_DATA(cmsg), &afd, sizeof(int));
+	}
+
+	return sendmsg(fd, &mh, 0);
+}
+
+static int
+memif_msg_send_from_queue(struct memif_control_channel *cc)
+{
+	ssize_t size;
+	int ret = 0;
+	struct memif_msg_queue_elt *e;
+	e = TAILQ_FIRST(&cc->msg_queue);
+	if (e == NULL)
+		return 0;
+
+	size = memif_msg_send(cc->intr_handle.fd, &e->msg, e->fd);
+	if (size != sizeof(memif_msg_t)) {
+		MIF_LOG(ERR, "sendmsg fail: %s.", strerror(errno));
+		ret = -1;
+	} else {
+		MIF_LOG(DEBUG, "%s: Sent msg type %u.",
+			(cc->pmd !=
+			 NULL) ? rte_vdev_device_name(cc->pmd->vdev) :
+				 "memif_driver",
+			e->msg.type);
+	}
+	TAILQ_REMOVE(&cc->msg_queue, e, next);
+	rte_free(e);
+
+	return ret;
+}
+
+static struct memif_msg_queue_elt *
+memif_msg_enq(struct memif_control_channel *cc)
+{
+	struct memif_msg_queue_elt *e = rte_zmalloc("memif_msg",
+						    sizeof(struct
+							   memif_msg_queue_elt),
+						    0);
+	if (e == NULL) {
+		MIF_LOG(ERR, "Failed to allocate control message.");
+		return NULL;
+	}
+
+	e->fd = -1;
+	TAILQ_INSERT_TAIL(&cc->msg_queue, e, next);
+
+	return e;
+}
+
+void
+memif_msg_enq_disconnect(struct memif_control_channel *cc, const char *reason,
+			 int err_code)
+{
+	struct memif_msg_queue_elt *e = memif_msg_enq(cc);
+	if (e == NULL) {
+		MIF_LOG(WARNING, "%s: Failed to enqueue disconnect message.",
+			(cc->pmd !=
+			 NULL) ? rte_vdev_device_name(cc->pmd->vdev) :
+				 "memif_driver");
+		return;
+	}
+
+	memif_msg_disconnect_t *d = &e->msg.disconnect;
+
+	e->msg.type = MEMIF_MSG_TYPE_DISCONNECT;
+	d->code = err_code;
+
+	if (reason != NULL) {
+		strlcpy((char *)d->string, reason, sizeof(d->string));
+		if (cc->pmd != NULL) {
+			strlcpy(cc->pmd->local_disc_string, reason,
+				sizeof(cc->pmd->local_disc_string));
+		}
+	}
+}
+
+static int
+memif_msg_enq_hello(struct memif_control_channel *cc)
+{
+	struct memif_msg_queue_elt *e = memif_msg_enq(cc);
+	if (e == NULL)
+		return -1;
+
+	memif_msg_hello_t *h = &e->msg.hello;
+
+	e->msg.type = MEMIF_MSG_TYPE_HELLO;
+	h->min_version = MEMIF_VERSION;
+	h->max_version = MEMIF_VERSION;
+	h->max_s2m_ring = ETH_MEMIF_MAX_NUM_Q_PAIRS;
+	h->max_m2s_ring = ETH_MEMIF_MAX_NUM_Q_PAIRS;
+	h->max_region = ETH_MEMIF_MAX_REGION_IDX;
+	h->max_log2_ring_size = ETH_MEMIF_MAX_LOG2_RING_SIZE;
+
+	strlcpy((char *)h->name, rte_version(), sizeof(h->name));
+
+	return 0;
+}
+
+static int
+memif_msg_receive_hello(struct pmd_internals *pmd, memif_msg_t *msg)
+{
+	memif_msg_hello_t *h = &msg->hello;
+
+	if (h->min_version > MEMIF_VERSION || h->max_version < MEMIF_VERSION) {
+		memif_msg_enq_disconnect(pmd->cc, "Incompatible memif version",
+					 0);
+		return -1;
+	}
+
+	/* Set parameters for active connection */
+	pmd->run.num_s2m_rings = RTE_MIN(h->max_s2m_ring + 1,
+					   pmd->cfg.num_s2m_rings);
+	pmd->run.num_m2s_rings = RTE_MIN(h->max_m2s_ring + 1,
+					   pmd->cfg.num_m2s_rings);
+	pmd->run.log2_ring_size = RTE_MIN(h->max_log2_ring_size,
+					    pmd->cfg.log2_ring_size);
+	pmd->run.buffer_size = pmd->cfg.buffer_size;
+
+	strlcpy(pmd->remote_name, (char *)h->name, sizeof(pmd->remote_name));
+
+	MIF_LOG(DEBUG, "%s: Connecting to %s.",
+		rte_vdev_device_name(pmd->vdev), pmd->remote_name);
+
+	return 0;
+}
+
+static int
+memif_msg_receive_init(struct memif_control_channel *cc, memif_msg_t *msg)
+{
+	memif_msg_init_t *i = &msg->init;
+	struct memif_socket_pmd_list_elt *elt;
+	struct pmd_internals *pmd;
+
+	if (i->version != MEMIF_VERSION) {
+		memif_msg_enq_disconnect(cc, "Incompatible memif version", 0);
+		return -1;
+	}
+
+	if (cc->socket == NULL) {
+		memif_msg_enq_disconnect(cc, "Device error", 0);
+		return -1;
+	}
+
+	/* Find device with requested ID */
+	TAILQ_FOREACH(elt, &cc->socket->pmd_queue, next) {
+		pmd = elt->pmd;
+		if (((pmd->flags & ETH_MEMIF_FLAG_DISABLED) == 0) &&
+		    pmd->id == i->id) {
+			/* assign control channel to device */
+			cc->pmd = pmd;
+			pmd->cc = cc;
+
+			if (i->mode != MEMIF_INTERFACE_MODE_ETHERNET) {
+				memif_msg_enq_disconnect(pmd->cc,
+							 "Only ethernet mode supported",
+							 0);
+				return -1;
+			}
+
+			if (pmd->flags && (ETH_MEMIF_FLAG_CONNECTING |
+					   ETH_MEMIF_FLAG_CONNECTED)) {
+				memif_msg_enq_disconnect(pmd->cc,
+							 "Already connected",
+							 0);
+				return -1;
+			}
+			strlcpy(pmd->remote_name, (char *)i->name,
+				sizeof(pmd->remote_name));
+
+			if (*pmd->secret != '\0') {
+				if (*i->secret == '\0') {
+					memif_msg_enq_disconnect(pmd->cc,
+								 "Secret required",
+								 0);
+					return -1;
+				}
+				if (strcmp(pmd->secret, (char *)i->secret) != 0) {
+					memif_msg_enq_disconnect(pmd->cc,
+								 "Incorrect secret",
+								 0);
+					return -1;
+				}
+			}
+
+			pmd->flags |= ETH_MEMIF_FLAG_CONNECTING;
+			return 0;
+		}
+	}
+
+	/* ID not found on this socket */
+	MIF_LOG(DEBUG, "ID %u not found.", i->id);
+	memif_msg_enq_disconnect(cc, "ID not found", 0);
+	return -1;
+}
+
+static int
+memif_msg_receive_add_region(struct pmd_internals *pmd, memif_msg_t *msg,
+			     int fd)
+{
+	memif_msg_add_region_t *ar = &msg->add_region;
+
+	if (fd < 0) {
+		memif_msg_enq_disconnect(pmd->cc, "Missing region fd", 0);
+		return -1;
+	}
+
+	struct memif_region *mr;
+
+	if (ar->index > ETH_MEMIF_MAX_REGION_IDX) {
+		memif_msg_enq_disconnect(pmd->cc, "Invalid region index", 0);
+		return -1;
+	}
+
+	mr = rte_realloc(pmd->regions, sizeof(struct memif_region) *
+			 (ar->index + 1), 0);
+	if (mr == NULL) {
+		memif_msg_enq_disconnect(pmd->cc, "Device error", 0);
+		return -1;
+	}
+
+	pmd->regions = mr;
+	pmd->regions[ar->index].fd = fd;
+	pmd->regions[ar->index].region_size = ar->size;
+	pmd->regions[ar->index].addr = NULL;
+	pmd->regions_num++;
+
+	return 0;
+}
+
+static int
+memif_msg_receive_add_ring(struct pmd_internals *pmd, memif_msg_t *msg, int fd)
+{
+	memif_msg_add_ring_t *ar = &msg->add_ring;
+
+	if (fd < 0) {
+		memif_msg_enq_disconnect(pmd->cc, "Missing interrupt fd", 0);
+		return -1;
+	}
+
+	struct memif_queue *mq;
+
+	/* check if we have enough queues */
+	if (ar->flags & MEMIF_MSG_ADD_RING_FLAG_S2M) {
+		if (ar->index >= pmd->cfg.num_s2m_rings) {
+			memif_msg_enq_disconnect(pmd->cc, "Invalid ring index",
+						 0);
+			return -1;
+		}
+		pmd->run.num_s2m_rings++;
+	} else {
+		if (ar->index >= pmd->cfg.num_m2s_rings) {
+			memif_msg_enq_disconnect(pmd->cc, "Invalid ring index",
+						 0);
+			return -1;
+		}
+		pmd->run.num_m2s_rings++;
+	}
+
+	mq = (ar->flags & MEMIF_MSG_ADD_RING_FLAG_S2M) ?
+	    &pmd->rx_queues[ar->index] : &pmd->tx_queues[ar->index];
+
+	mq->intr_handle.fd = fd;
+	mq->log2_ring_size = ar->log2_ring_size;
+	mq->region = ar->region;
+	mq->offset = ar->offset;
+
+	return 0;
+}
+
+static int
+memif_msg_receive_connect(struct pmd_internals *pmd, memif_msg_t *msg)
+{
+	memif_msg_connect_t *c = &msg->connect;
+	int ret;
+
+	ret = memif_connect(pmd);
+	if (ret < 0)
+		return ret;
+
+	strlcpy(pmd->remote_if_name, (char *)c->if_name,
+		sizeof(pmd->remote_if_name));
+	MIF_LOG(INFO, "%s: Remote interface %s connected.",
+		rte_vdev_device_name(pmd->vdev), pmd->remote_if_name);
+
+	return 0;
+}
+
+static int
+memif_msg_receive_connected(struct pmd_internals *pmd, memif_msg_t *msg)
+{
+	memif_msg_connected_t *c = &msg->connected;
+	int ret;
+
+	ret = memif_connect(pmd);
+	if (ret < 0)
+		return ret;
+
+	strlcpy(pmd->remote_if_name, (char *)c->if_name,
+		sizeof(pmd->remote_if_name));
+	MIF_LOG(INFO, "%s: Remote interface %s connected.",
+		rte_vdev_device_name(pmd->vdev), pmd->remote_if_name);
+
+	return 0;
+}
+
+static int
+memif_msg_receive_disconnect(struct pmd_internals *pmd, memif_msg_t *msg)
+{
+	memif_msg_disconnect_t *d = &msg->disconnect;
+
+	memset(pmd->remote_disc_string, 0, sizeof(pmd->remote_disc_string));
+	strlcpy(pmd->remote_disc_string, (char *)d->string,
+		sizeof(pmd->remote_disc_string));
+
+	MIF_LOG(INFO, "%s: Disconnect received: %s",
+		rte_vdev_device_name(pmd->vdev), pmd->remote_disc_string);
+
+	memset(pmd->local_disc_string, 0, 96);
+	memif_disconnect(rte_eth_dev_allocated
+			 (rte_vdev_device_name(pmd->vdev)));
+	return 0;
+}
+
+static int
+memif_msg_enq_ack(struct pmd_internals *pmd)
+{
+	struct memif_msg_queue_elt *e = memif_msg_enq(pmd->cc);
+	if (e == NULL)
+		return -1;
+
+	e->msg.type = MEMIF_MSG_TYPE_ACK;
+
+	return 0;
+}
+
+static int
+memif_msg_enq_init(struct pmd_internals *pmd)
+{
+	struct memif_msg_queue_elt *e = memif_msg_enq(pmd->cc);
+	if (e == NULL)
+		return -1;
+
+	memif_msg_init_t *i = &e->msg.init;
+
+	e->msg.type = MEMIF_MSG_TYPE_INIT;
+	i->version = MEMIF_VERSION;
+	i->id = pmd->id;
+	i->mode = MEMIF_INTERFACE_MODE_ETHERNET;
+
+	strlcpy((char *)i->name, rte_version(), sizeof(i->name));
+
+	if (pmd->secret)
+		strlcpy((char *)i->secret, pmd->secret, sizeof(i->secret));
+
+	return 0;
+}
+
+static int
+memif_msg_enq_add_region(struct pmd_internals *pmd, uint8_t idx)
+{
+	struct memif_msg_queue_elt *e = memif_msg_enq(pmd->cc);
+	if (e == NULL)
+		return -1;
+
+	memif_msg_add_region_t *ar = &e->msg.add_region;
+	struct memif_region *mr = &pmd->regions[idx];
+
+	e->msg.type = MEMIF_MSG_TYPE_ADD_REGION;
+	e->fd = mr->fd;
+	ar->index = idx;
+	ar->size = mr->region_size;
+
+	return 0;
+}
+
+static int
+memif_msg_enq_add_ring(struct pmd_internals *pmd, uint8_t idx,
+		       memif_ring_type_t type)
+{
+	struct memif_msg_queue_elt *e = memif_msg_enq(pmd->cc);
+	if (e == NULL)
+		return -1;
+
+	memif_msg_add_ring_t *ar = &e->msg.add_ring;
+	struct memif_queue *mq;
+
+	mq = (type == MEMIF_RING_S2M) ? &pmd->tx_queues[idx] :
+	    &pmd->rx_queues[idx];
+
+	e->msg.type = MEMIF_MSG_TYPE_ADD_RING;
+	e->fd = mq->intr_handle.fd;
+	ar->index = idx;
+	ar->offset = mq->offset;
+	ar->region = mq->region;
+	ar->log2_ring_size = mq->log2_ring_size;
+	ar->flags = (type == MEMIF_RING_S2M) ? MEMIF_MSG_ADD_RING_FLAG_S2M : 0;
+	ar->private_hdr_size = 0;
+
+	return 0;
+}
+
+static int
+memif_msg_enq_connect(struct pmd_internals *pmd)
+{
+	struct memif_msg_queue_elt *e = memif_msg_enq(pmd->cc);
+	if (e == NULL)
+		return -1;
+
+	memif_msg_connect_t *c = &e->msg.connect;
+	const char *name = rte_vdev_device_name(pmd->vdev);
+
+	e->msg.type = MEMIF_MSG_TYPE_CONNECT;
+	strlcpy((char *)c->if_name, name, sizeof(c->if_name));
+
+	return 0;
+}
+
+static int
+memif_msg_enq_connected(struct pmd_internals *pmd)
+{
+	struct memif_msg_queue_elt *e = memif_msg_enq(pmd->cc);
+	if (e == NULL)
+		return -1;
+
+	memif_msg_connected_t *c = &e->msg.connected;
+
+	const char *name = rte_vdev_device_name(pmd->vdev);
+
+	e->msg.type = MEMIF_MSG_TYPE_CONNECTED;
+	strlcpy((char *)c->if_name, name, sizeof(c->if_name));
+
+	return 0;
+}
+
+static void
+memif_intr_unregister_handler(struct rte_intr_handle *intr_handle, void *arg)
+{
+	struct memif_msg_queue_elt *elt;
+	struct memif_control_channel *cc = arg;
+	/* close control channel fd */
+	close(intr_handle->fd);
+	/* clear message queue */
+	while ((elt = TAILQ_FIRST(&cc->msg_queue)) != NULL) {
+		TAILQ_REMOVE(&cc->msg_queue, elt, next);
+		free(elt);
+	}
+	/* free control channel */
+	rte_free(cc);
+}
+
+void
+memif_disconnect(struct rte_eth_dev *dev)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	struct memif_msg_queue_elt *elt;
+	int i;
+	int ret;
+
+	if (pmd->cc != NULL) {
+		/* Clear control message queue (except disconnect message if any). */
+		while ((elt = TAILQ_FIRST(&pmd->cc->msg_queue)) != NULL) {
+			if (elt->msg.type != MEMIF_MSG_TYPE_DISCONNECT) {
+				TAILQ_REMOVE(&pmd->cc->msg_queue, elt, next);
+				free(elt);
+			}
+		}
+		/* send disconnect message (if there is any in queue) */
+		memif_msg_send_from_queue(pmd->cc);
+
+		/* at this point, there should be no more messages in queue */
+		if (TAILQ_FIRST(&pmd->cc->msg_queue) != NULL) {
+			MIF_LOG(WARNING,
+				"%s: Unexpected message(s) in message queue.",
+				rte_vdev_device_name(pmd->vdev));
+		}
+
+		if (pmd->cc->intr_handle.fd > 0) {
+			ret =
+			    rte_intr_callback_unregister(&pmd->cc->intr_handle,
+							 memif_intr_handler,
+							 pmd->cc);
+			/*
+			 * If callback is active (disconnecting based on
+			 * received control message).
+			 */
+			if (ret == -EAGAIN) {
+				ret =
+				    rte_intr_callback_unregister_pending(&pmd->
+							cc->intr_handle,
+							memif_intr_handler,
+							pmd->cc,
+							memif_intr_unregister_handler);
+			} else if (ret > 0) {
+				close(pmd->cc->intr_handle.fd);
+				rte_free(pmd->cc);
+			}
+			if (ret <= 0)
+				MIF_LOG(WARNING,
+					"%s: Failed to unregister control channel callback.",
+					rte_vdev_device_name(pmd->vdev));
+		}
+	}
+
+	/* unconfig interrupts */
+	struct memif_queue *mq;
+	for (i = 0; i < pmd->cfg.num_s2m_rings; i++) {
+		mq = (pmd->role == MEMIF_ROLE_SLAVE) ?
+		    &pmd->tx_queues[i] : &pmd->rx_queues[i];
+		if (mq->intr_handle.fd > 0) {
+			rte_intr_disable(&mq->intr_handle);
+			close(mq->intr_handle.fd);
+			mq->intr_handle.fd = -1;
+		}
+		mq->ring = NULL;
+	}
+	for (i = 0; i < pmd->cfg.num_m2s_rings; i++) {
+		mq = (pmd->role == MEMIF_ROLE_SLAVE) ?
+		    &pmd->rx_queues[i] : &pmd->tx_queues[i];
+		if (mq->intr_handle.fd > 0) {
+			rte_intr_disable(&mq->intr_handle);
+			close(mq->intr_handle.fd);
+			mq->intr_handle.fd = -1;
+		}
+		mq->ring = NULL;
+	}
+
+	memif_free_regions(pmd);
+
+	dev->data->dev_link.link_status = ETH_LINK_DOWN;
+	pmd->flags &= ~ETH_MEMIF_FLAG_CONNECTING;
+	pmd->flags &= ~ETH_MEMIF_FLAG_CONNECTED;
+	MIF_LOG(DEBUG, "%s: Disconnected.", rte_vdev_device_name(pmd->vdev));
+}
+
+static int
+memif_msg_receive(struct memif_control_channel *cc)
+{
+	char ctl[CMSG_SPACE(sizeof(int)) +
+		 CMSG_SPACE(sizeof(struct ucred))] = { 0 };
+	struct msghdr mh = { 0 };
+	struct iovec iov[1];
+	memif_msg_t msg = { 0 };
+	ssize_t size;
+	int ret = 0;
+	struct ucred *cr __rte_unused;
+	cr = 0;
+	struct cmsghdr *cmsg;
+	int afd = -1;
+	int i;
+
+	iov[0].iov_base = (void *)&msg;
+	iov[0].iov_len = sizeof(memif_msg_t);
+	mh.msg_iov = iov;
+	mh.msg_iovlen = 1;
+	mh.msg_control = ctl;
+	mh.msg_controllen = sizeof(ctl);
+
+	size = recvmsg(cc->intr_handle.fd, &mh, 0);
+	if (size != sizeof(memif_msg_t)) {
+		MIF_LOG(DEBUG, "Invalid message size.");
+		memif_msg_enq_disconnect(cc, "Invalid message size", 0);
+		return -1;
+	}
+	MIF_LOG(DEBUG, "Received msg type: %u.", msg.type);
+
+	cmsg = CMSG_FIRSTHDR(&mh);
+	while (cmsg) {
+		if (cmsg->cmsg_level == SOL_SOCKET) {
+			if (cmsg->cmsg_type == SCM_CREDENTIALS)
+				cr = (struct ucred *)CMSG_DATA(cmsg);
+			else if (cmsg->cmsg_type == SCM_RIGHTS)
+				afd = *(int *)CMSG_DATA(cmsg);
+		}
+		cmsg = CMSG_NXTHDR(&mh, cmsg);
+	}
+
+	if (cc->pmd == NULL && msg.type != MEMIF_MSG_TYPE_INIT) {
+		MIF_LOG(DEBUG, "Unexpected message.");
+		memif_msg_enq_disconnect(cc, "Unexpected message", 0);
+		return -1;
+	}
+
+	/* get device from hash data */
+	switch (msg.type) {
+	case MEMIF_MSG_TYPE_ACK:
+		break;
+	case MEMIF_MSG_TYPE_HELLO:
+		ret = memif_msg_receive_hello(cc->pmd, &msg);
+		if (ret < 0)
+			goto exit;
+		ret = memif_init_regions_and_queues(cc->pmd);
+		if (ret < 0)
+			goto exit;
+		ret = memif_msg_enq_init(cc->pmd);
+		if (ret < 0)
+			goto exit;
+		for (i = 0; i < cc->pmd->regions_num; i++) {
+			ret = memif_msg_enq_add_region(cc->pmd, i);
+			if (ret < 0)
+				goto exit;
+		}
+		for (i = 0; i < cc->pmd->run.num_s2m_rings; i++) {
+			ret = memif_msg_enq_add_ring(cc->pmd, i,
+						     MEMIF_RING_S2M);
+			if (ret < 0)
+				goto exit;
+		}
+		for (i = 0; i < cc->pmd->run.num_m2s_rings; i++) {
+			ret = memif_msg_enq_add_ring(cc->pmd, i,
+						     MEMIF_RING_M2S);
+			if (ret < 0)
+				goto exit;
+		}
+		ret = memif_msg_enq_connect(cc->pmd);
+		if (ret < 0)
+			goto exit;
+		break;
+	case MEMIF_MSG_TYPE_INIT:
+		ret = memif_msg_receive_init(cc, &msg);
+		if (ret < 0)
+			goto exit;
+		ret = memif_msg_enq_ack(cc->pmd);
+		if (ret < 0)
+			goto exit;
+		break;
+	case MEMIF_MSG_TYPE_ADD_REGION:
+		ret = memif_msg_receive_add_region(cc->pmd, &msg, afd);
+		if (ret < 0)
+			goto exit;
+		ret = memif_msg_enq_ack(cc->pmd);
+		if (ret < 0)
+			goto exit;
+		break;
+	case MEMIF_MSG_TYPE_ADD_RING:
+		ret = memif_msg_receive_add_ring(cc->pmd, &msg, afd);
+		if (ret < 0)
+			goto exit;
+		ret = memif_msg_enq_ack(cc->pmd);
+		if (ret < 0)
+			goto exit;
+		break;
+	case MEMIF_MSG_TYPE_CONNECT:
+		ret = memif_msg_receive_connect(cc->pmd, &msg);
+		if (ret < 0)
+			goto exit;
+		ret = memif_msg_enq_connected(cc->pmd);
+		if (ret < 0)
+			goto exit;
+		break;
+	case MEMIF_MSG_TYPE_CONNECTED:
+		ret = memif_msg_receive_connected(cc->pmd, &msg);
+		break;
+	case MEMIF_MSG_TYPE_DISCONNECT:
+		ret = memif_msg_receive_disconnect(cc->pmd, &msg);
+		if (ret < 0)
+			goto exit;
+		break;
+	default:
+		memif_msg_enq_disconnect(cc, "Unknown message type", 0);
+		ret = -1;
+		goto exit;
+	}
+
+ exit:
+	return ret;
+}
+
+static void
+memif_intr_handler(void *arg)
+{
+	struct memif_control_channel *cc = arg;
+	struct rte_eth_dev *dev;
+	int ret;
+
+	ret = memif_msg_receive(cc);
+	/* if driver failed to assign device */
+	if (cc->pmd == NULL) {
+		ret = rte_intr_callback_unregister_pending(&cc->intr_handle,
+							   memif_intr_handler,
+							   cc,
+							   memif_intr_unregister_handler);
+		if (ret < 0)
+			MIF_LOG(WARNING,
+				"Failed to unregister control channel callback.");
+		return;
+	}
+	/* if memif_msg_receive failed */
+	if (ret < 0)
+		goto disconnect;
+
+	ret = memif_msg_send_from_queue(cc);
+	if (ret < 0)
+		goto disconnect;
+
+	return;
+
+ disconnect:
+	dev = rte_eth_dev_allocated(rte_vdev_device_name(cc->pmd->vdev));
+	if (dev == NULL) {
+		MIF_LOG(WARNING, "%s: eth dev not allocated",
+			rte_vdev_device_name(cc->pmd->vdev));
+		return;
+	}
+	memif_disconnect(dev);
+}
+
+static void
+memif_listener_handler(void *arg)
+{
+	struct memif_socket *socket = arg;
+	int sockfd;
+	int addr_len;
+	struct sockaddr_un client;
+	struct memif_control_channel *cc;
+	int ret;
+
+	addr_len = sizeof(client);
+	sockfd = accept(socket->intr_handle.fd, (struct sockaddr *)&client,
+			(socklen_t *)&addr_len);
+	if (sockfd < 0) {
+		MIF_LOG(ERR,
+			"Failed to accept connection request on socket fd %d",
+			socket->intr_handle.fd);
+		return;
+	}
+
+	MIF_LOG(DEBUG, "%s: Connection request accepted.", socket->filename);
+
+	cc = rte_zmalloc("memif-cc", sizeof(struct memif_control_channel), 0);
+	if (cc == NULL) {
+		MIF_LOG(ERR, "Failed to allocate control channel.");
+		goto error;
+	}
+
+	cc->intr_handle.fd = sockfd;
+	cc->intr_handle.type = RTE_INTR_HANDLE_EXT;
+	cc->socket = socket;
+	cc->pmd = NULL;
+	TAILQ_INIT(&cc->msg_queue);
+
+	ret =
+	    rte_intr_callback_register(&cc->intr_handle, memif_intr_handler,
+				       cc);
+	if (ret < 0) {
+		MIF_LOG(ERR, "Failed to register control channel callback.");
+		goto error;
+	}
+
+	ret = memif_msg_enq_hello(cc);
+	if (ret < 0) {
+		MIF_LOG(ERR, "Failed to enqueue hello message.");
+		goto error;
+	}
+	ret = memif_msg_send_from_queue(cc);
+	if (ret < 0)
+		goto error;
+
+	return;
+
+ error:
+	if (sockfd > 0) {
+		close(sockfd);
+		sockfd = -1;
+	}
+	if (cc != NULL) {
+		rte_free(cc);
+		cc = NULL;
+	}
+}
+
+static struct memif_socket *
+memif_socket_create(struct pmd_internals *pmd, char *key, uint8_t listener)
+{
+	struct memif_socket *sock;
+	struct sockaddr_un un;
+	int sockfd;
+	int ret;
+	int on = 1;
+
+	sock = rte_zmalloc("memif-socket", sizeof(struct memif_socket), 0);
+	if (sock == NULL) {
+		MIF_LOG(ERR, "Failed to allocate memory for memif socket");
+		return NULL;
+	}
+
+	sock->listener = listener;
+	rte_memcpy(sock->filename, key, 256);
+	TAILQ_INIT(&sock->pmd_queue);
+
+	if (listener != 0) {
+		sockfd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+		if (sockfd < 0)
+			goto error;
+
+		un.sun_family = AF_UNIX;
+		memcpy(un.sun_path, sock->filename,
+			sizeof(un.sun_path) - 1);
+
+		ret = setsockopt(sockfd, SOL_SOCKET, SO_PASSCRED, &on,
+				 sizeof(on));
+		if (ret < 0)
+			goto error;
+		ret = bind(sockfd, (struct sockaddr *)&un, sizeof(un));
+		if (ret < 0)
+			goto error;
+		ret = listen(sockfd, 1);
+		if (ret < 0)
+			goto error;
+
+		MIF_LOG(DEBUG, "%s: Memif listener socket %s created.",
+			rte_vdev_device_name(pmd->vdev), sock->filename);
+
+		sock->intr_handle.fd = sockfd;
+		sock->intr_handle.type = RTE_INTR_HANDLE_EXT;
+		ret = rte_intr_callback_register(&sock->intr_handle,
+						 memif_listener_handler, sock);
+		if (ret < 0) {
+			MIF_LOG(ERR, "%s: Failed to register interrupt "
+				"callback for listener socket",
+				rte_vdev_device_name(pmd->vdev));
+			return NULL;
+		}
+	}
+
+	return sock;
+
+ error:
+	MIF_LOG(ERR, "%s: Failed to setup socket %s: %s",
+		rte_vdev_device_name(pmd->vdev), key, strerror(errno));
+	if (sock != NULL)
+		rte_free(sock);
+	return NULL;
+}
+
+static struct rte_hash *
+memif_create_socket_hash(void)
+{
+	struct rte_hash_parameters params = { 0 };
+	params.name = MEMIF_SOCKET_HASH_NAME;
+	params.entries = 256;
+	params.key_len = 256;
+	params.hash_func = rte_jhash;
+	params.hash_func_init_val = 0;
+	return rte_hash_create(&params);
+}
+
+int
+memif_socket_init(struct rte_eth_dev *dev, const char *socket_filename)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	struct memif_socket *socket = NULL;
+	struct memif_socket_pmd_list_elt *elt;
+	int ret;
+	char key[256];
+
+	struct rte_hash *hash = rte_hash_find_existing(MEMIF_SOCKET_HASH_NAME);
+	if (hash == NULL) {
+		hash = memif_create_socket_hash();
+		if (hash == NULL) {
+			MIF_LOG(ERR, "Failed to create memif socket hash.");
+			return -1;
+		}
+	}
+
+	memset(key, 0, 256);
+	rte_memcpy(key, socket_filename, strlen(socket_filename));
+	ret = rte_hash_lookup_data(hash, key, (void **)&socket);
+	if (ret < 0) {
+		socket = memif_socket_create(pmd, key,
+					     (pmd->role ==
+					      MEMIF_ROLE_SLAVE) ? 0 : 1);
+		if (socket == NULL)
+			return -1;
+		ret = rte_hash_add_key_data(hash, key, socket);
+		if (ret < 0) {
+			MIF_LOG(ERR, "Failed to add socket to socket hash.");
+			return ret;
+		}
+	}
+	pmd->socket_filename = socket->filename;
+
+	if (socket->listener != 0 && pmd->role == MEMIF_ROLE_SLAVE) {
+		MIF_LOG(ERR, "Socket is a listener.");
+		return -1;
+	} else if ((socket->listener == 0) && (pmd->role == MEMIF_ROLE_MASTER)) {
+		MIF_LOG(ERR, "Socket is not a listener.");
+		return -1;
+	}
+
+	TAILQ_FOREACH(elt, &socket->pmd_queue, next) {
+		if (elt->pmd->id == pmd->id) {
+			MIF_LOG(ERR, "Memif device with id %d already "
+				"exists on socket %s",
+				pmd->id, socket->filename);
+			return -1;
+		}
+	}
+
+	elt =
+	    rte_malloc("pmd-queue", sizeof(struct memif_socket_pmd_list_elt),
+		       0);
+	if (elt == NULL) {
+		MIF_LOG(ERR, "%s: Failed to add device to socket device list.",
+			rte_vdev_device_name(pmd->vdev));
+		return -1;
+	}
+	elt->pmd = pmd;
+	TAILQ_INSERT_TAIL(&socket->pmd_queue, elt, next);
+
+	return 0;
+}
+
+void
+memif_socket_remove_device(struct pmd_internals *pmd)
+{
+	struct memif_socket *socket = NULL;
+	struct memif_socket_pmd_list_elt *elt, *next;
+
+	struct rte_hash *hash = rte_hash_find_existing(MEMIF_SOCKET_HASH_NAME);
+	if (hash == NULL)
+		return;
+
+	if (rte_hash_lookup_data(hash, pmd->socket_filename, (void **)&socket) <
+	    0)
+		return;
+
+	for (elt = TAILQ_FIRST(&socket->pmd_queue); elt != NULL; elt = next) {
+		next = TAILQ_NEXT(elt, next);
+		if (elt->pmd == pmd) {
+			TAILQ_REMOVE(&socket->pmd_queue, elt, next);
+			free(elt);
+			pmd->socket_filename = NULL;
+		}
+	}
+
+	/* remove socket, if this was the last device using it */
+	if (TAILQ_EMPTY(&socket->pmd_queue)) {
+		rte_hash_del_key(hash, socket->filename);
+		if (socket->listener) {
+			/* remove listener socket file,
+			 * so we can create new one later.
+			 */
+			remove(socket->filename);
+		}
+		rte_free(socket);
+	}
+}
+
+int
+memif_connect_master(struct rte_eth_dev *dev)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	if (pmd->rx_queues == NULL || pmd->tx_queues == NULL ||
+	    pmd->socket_filename == NULL) {
+		MIF_LOG(ERR, "%s: Device not configured!",
+			rte_vdev_device_name(pmd->vdev));
+		return -1;
+	}
+	memset(pmd->local_disc_string, 0, 96);
+	memset(pmd->remote_disc_string, 0, 96);
+	pmd->flags &= ~ETH_MEMIF_FLAG_DISABLED;
+	return 0;
+}
+
+int
+memif_connect_slave(struct rte_eth_dev *dev)
+{
+	int sockfd;
+	int ret;
+	struct sockaddr_un sun;
+	struct pmd_internals *pmd = dev->data->dev_private;
+
+	if (pmd->rx_queues == NULL || pmd->tx_queues == NULL ||
+	    pmd->socket_filename == NULL) {
+		MIF_LOG(ERR, "%s: Device not configured!",
+			rte_vdev_device_name(pmd->vdev));
+		return -1;
+	}
+
+	memset(pmd->local_disc_string, 0, 96);
+	memset(pmd->remote_disc_string, 0, 96);
+	pmd->flags &= ~ETH_MEMIF_FLAG_DISABLED;
+
+	sockfd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+	if (sockfd < 0) {
+		MIF_LOG(ERR, "%s: Failed to open socket.",
+			rte_vdev_device_name(pmd->vdev));
+		return -1;
+	}
+
+	sun.sun_family = AF_UNIX;
+
+	memcpy(sun.sun_path, pmd->socket_filename, sizeof(sun.sun_path) - 1);
+
+	ret = connect(sockfd, (struct sockaddr *)&sun,
+		      sizeof(struct sockaddr_un));
+	if (ret < 0) {
+		MIF_LOG(ERR, "%s: Failed to connect socket: %s.",
+			rte_vdev_device_name(pmd->vdev), pmd->socket_filename);
+		goto error;
+	}
+
+	MIF_LOG(DEBUG, "%s: Memif socket: %s connected.",
+		rte_vdev_device_name(pmd->vdev), pmd->socket_filename);
+
+	pmd->cc = rte_zmalloc("memif-cc",
+			      sizeof(struct memif_control_channel), 0);
+	if (pmd->cc == NULL) {
+		MIF_LOG(ERR, "%s: Failed to allocate control channel.",
+			rte_vdev_device_name(pmd->vdev));
+		goto error;
+	}
+
+	pmd->cc->intr_handle.fd = sockfd;
+	pmd->cc->intr_handle.type = RTE_INTR_HANDLE_EXT;
+	pmd->cc->socket = NULL;
+	pmd->cc->pmd = pmd;
+	TAILQ_INIT(&pmd->cc->msg_queue);
+
+	ret = rte_intr_callback_register(&pmd->cc->intr_handle,
+					 memif_intr_handler, pmd->cc);
+	if (ret < 0) {
+		MIF_LOG(ERR, "%s: Failed to register interrupt callback "
+			"for controll fd", rte_vdev_device_name(pmd->vdev));
+		goto error;
+	}
+
+	return 0;
+
+ error:
+	if (sockfd > 0) {
+		close(sockfd);
+		sockfd = -1;
+	}
+	if (pmd->cc != NULL) {
+		rte_free(pmd->cc);
+		pmd->cc = NULL;
+	}
+	return -1;
+}
diff --git a/drivers/net/memif/memif_socket.h b/drivers/net/memif/memif_socket.h
new file mode 100644
index 000000000..e67009404
--- /dev/null
+++ b/drivers/net/memif/memif_socket.h
@@ -0,0 +1,104 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 Cisco Systems, Inc.  All rights reserved.
+ */
+
+#ifndef _MEMIF_SOCKET_H_
+#define _MEMIF_SOCKET_H_
+
+#include <sys/queue.h>
+
+/**
+ * Remove device from socket device list. If no device is left on the socket,
+ * remove the socket as well.
+ *
+ * @param pmd
+ *   device internals
+ */
+void memif_socket_remove_device(struct pmd_internals *pmd);
+
+/**
+ * Enqueue disconnect message to control channel message queue.
+ *
+ * @param cc
+ *   control channel
+ * @param reason
+ *   const string stating disconnect reason (96 characters)
+ * @param err_code
+ *   error code
+ */
+void memif_msg_enq_disconnect(struct memif_control_channel *cc, const char *reason,
+			      int err_code);
+
+/**
+ * Initialize memif socket for specified device. If socket doesn't exist, create socket.
+ *
+ * @param dev
+ *   memif ethernet device
+ * @param socket_filename
+ *   socket filename
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+int memif_socket_init(struct rte_eth_dev *dev, const char *socket_filename);
+
+/**
+ * Disconnect memif device. Close control channel and shared memory.
+ *
+ * @param dev
+ *   ethernet device
+ */
+void memif_disconnect(struct rte_eth_dev *dev);
+
+/**
+ * If device is properly configured, enable connection establishment.
+ *
+ * @param dev
+ *   memif ethernet device
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+int memif_connect_master(struct rte_eth_dev *dev);
+
+/**
+ * If device is properly configured, send connection request.
+ *
+ * @param dev
+ *   memif ethernet device
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+int memif_connect_slave(struct rte_eth_dev *dev);
+
+struct memif_socket_pmd_list_elt {
+	TAILQ_ENTRY(memif_socket_pmd_list_elt) next;
+	struct pmd_internals *pmd;		/**< pointer to device internals */
+};
+
+#define MEMIF_SOCKET_HASH_NAME			"memif-sh"
+struct memif_socket {
+	struct rte_intr_handle intr_handle;	/**< interrupt handle */
+	uint8_t listener;			/**< if not zero socket is listener */
+	char filename[256];			/**< socket filename */
+
+	TAILQ_HEAD(, memif_socket_pmd_list_elt) pmd_queue;
+	/**< Queue of devices using this socket */
+};
+
+/* Control message queue. */
+struct memif_msg_queue_elt {
+	TAILQ_ENTRY(memif_msg_queue_elt) next;
+	memif_msg_t msg;			/**< control message */
+	int fd;					/**< fd to be sent to peer */
+};
+
+struct memif_control_channel {
+	struct rte_intr_handle intr_handle;	/**< interrupt handle */
+	 TAILQ_HEAD(, memif_msg_queue_elt) msg_queue; /**< control message queue */
+	struct memif_socket *socket;		/**< pointer to socket */
+	struct pmd_internals *pmd;		/**< pointer to device internals */
+};
+
+#endif				/* MEMIF_SOCKET_H */
diff --git a/drivers/net/memif/meson.build b/drivers/net/memif/meson.build
new file mode 100644
index 000000000..a6f6ea8bc
--- /dev/null
+++ b/drivers/net/memif/meson.build
@@ -0,0 +1,10 @@ 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright 2018 Cisco Systems, Inc.  All rights reserved.
+
+if host_machine.system() != 'linux'
+        build = false
+endif
+sources = files('rte_eth_memif.c',
+		'memif_socket.c')
+
+deps += ['hash']
diff --git a/drivers/net/memif/rte_eth_memif.c b/drivers/net/memif/rte_eth_memif.c
new file mode 100644
index 000000000..5540b10cc
--- /dev/null
+++ b/drivers/net/memif/rte_eth_memif.c
@@ -0,0 +1,1189 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 Cisco Systems, Inc.  All rights reserved.
+ */
+
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <linux/if_ether.h>
+#include <errno.h>
+#include <sys/eventfd.h>
+
+#include <rte_version.h>
+#include <rte_mbuf.h>
+#include <rte_ether.h>
+#include <rte_ethdev_driver.h>
+#include <rte_ethdev_vdev.h>
+#include <rte_malloc.h>
+#include <rte_kvargs.h>
+#include <rte_bus_vdev.h>
+#include <rte_string_fns.h>
+
+#include <rte_eth_memif.h>
+#include <memif_socket.h>
+
+#define ETH_MEMIF_ID_ARG		"id"
+#define ETH_MEMIF_ROLE_ARG		"role"
+#define ETH_MEMIF_BUFFER_SIZE_ARG	"bsize"
+#define ETH_MEMIF_RING_SIZE_ARG		"rsize"
+#define ETH_MEMIF_NRXQ_ARG		"nrxq"
+#define ETH_MEMIF_NTXQ_ARG		"ntxq"
+#define ETH_MEMIF_SOCKET_ARG		"socket"
+#define ETH_MEMIF_MAC_ARG		"mac"
+#define ETH_MEMIF_ZC_ARG		"zero-copy"
+#define ETH_MEMIF_SECRET_ARG		"secret"
+
+static const char *valid_arguments[] = {
+	ETH_MEMIF_ID_ARG,
+	ETH_MEMIF_ROLE_ARG,
+	ETH_MEMIF_BUFFER_SIZE_ARG,
+	ETH_MEMIF_RING_SIZE_ARG,
+	ETH_MEMIF_NRXQ_ARG,
+	ETH_MEMIF_NTXQ_ARG,
+	ETH_MEMIF_SOCKET_ARG,
+	ETH_MEMIF_MAC_ARG,
+	ETH_MEMIF_ZC_ARG,
+	ETH_MEMIF_SECRET_ARG,
+	NULL
+};
+
+static struct rte_vdev_driver pmd_memif_drv;
+
+const char *
+memif_version(void)
+{
+#define STR_HELP(s)	#s
+#define STR(s)		STR_HELP(s)
+	return ("memif-" STR(MEMIF_VERSION_MAJOR) "." STR(MEMIF_VERSION_MINOR));
+#undef STR
+#undef STR_HELP
+}
+
+static void
+memif_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+
+	dev_info->if_index = pmd->if_index;
+	dev_info->max_mac_addrs = 1;
+	dev_info->max_rx_pktlen = (uint32_t)ETH_FRAME_LEN;
+	dev_info->max_rx_queues = (pmd->role == MEMIF_ROLE_SLAVE) ?
+	    pmd->cfg.num_m2s_rings : pmd->cfg.num_s2m_rings;
+	dev_info->max_tx_queues = (pmd->role == MEMIF_ROLE_SLAVE) ?
+	    pmd->cfg.num_s2m_rings : pmd->cfg.num_m2s_rings;
+	dev_info->min_rx_bufsize = 0;
+}
+
+static memif_ring_t *
+memif_get_ring(struct pmd_internals *pmd, memif_ring_type_t type, uint16_t ring_num)
+{
+	/* rings only in region 0 */
+	void *p = pmd->regions[0].addr;
+	int ring_size = sizeof(memif_ring_t) + sizeof(memif_desc_t) *
+	    (1 << pmd->run.log2_ring_size);
+	p += (ring_num + type * pmd->run.num_s2m_rings) * ring_size;
+
+	return (memif_ring_t *)p;
+}
+
+static void *
+memif_get_buffer(struct pmd_internals *pmd, memif_desc_t *d)
+{
+	return (pmd->regions[d->region].addr + d->offset);
+}
+
+static uint16_t
+eth_memif_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
+{
+	struct memif_queue *mq = queue;
+	struct pmd_internals *pmd = mq->pmd;
+	if (unlikely((pmd->flags & ETH_MEMIF_FLAG_CONNECTED) == 0))
+		return 0;
+	memif_ring_t *ring = mq->ring;
+	if (unlikely(ring == NULL))
+		return 0;
+	uint16_t cur_slot, last_slot, n_slots, ring_size, mask, s0;
+	uint16_t n_rx_pkts = 0;
+	uint16_t mbuf_size = rte_pktmbuf_data_room_size(mq->mempool) -
+	    RTE_PKTMBUF_HEADROOM;
+	uint16_t src_len, src_off, dst_len, dst_off, cp_len;
+	memif_ring_type_t type = mq->type;
+	memif_desc_t *d0;
+	struct rte_mbuf *mbuf;
+	struct rte_mbuf *mbuf_head = NULL;
+
+	/* consume interrupt */
+	if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0) {
+		uint64_t b;
+		ssize_t size __rte_unused;
+		size = read(mq->intr_handle.fd, &b, sizeof(b));
+	}
+
+	ring_size = 1 << mq->log2_ring_size;
+	mask = ring_size - 1;
+
+	cur_slot = (type == MEMIF_RING_S2M) ? mq->last_head : mq->last_tail;
+	last_slot = (type == MEMIF_RING_S2M) ? ring->head : ring->tail;
+	if (cur_slot == last_slot)
+		goto refill;
+	n_slots = last_slot - cur_slot;
+
+	while (n_slots && n_rx_pkts < nb_pkts) {
+		mbuf_head = rte_pktmbuf_alloc(mq->mempool);
+		if (unlikely(mbuf_head == NULL))
+			goto no_free_bufs;
+		mbuf = mbuf_head;
+		mbuf->port = mq->in_port;
+
+ next_slot:
+		s0 = cur_slot & mask;
+		d0 = &ring->desc[s0];
+
+		src_len = d0->length;
+		dst_off = 0;
+		src_off = 0;
+
+		do {
+			dst_len = mbuf_size - dst_off;
+			if (dst_len == 0) {
+				dst_off = 0;
+				dst_len = mbuf_size + RTE_PKTMBUF_HEADROOM;
+
+				mbuf = rte_pktmbuf_alloc(mq->mempool);
+				if (unlikely(mbuf == NULL))
+					goto no_free_bufs;
+				mbuf->port = mq->in_port;
+				rte_pktmbuf_chain(mbuf_head, mbuf);
+			}
+			cp_len = RTE_MIN(dst_len, src_len);
+
+			rte_pktmbuf_pkt_len(mbuf) =
+			    rte_pktmbuf_data_len(mbuf) += cp_len;
+
+			memcpy(rte_pktmbuf_mtod_offset(mbuf, void *, dst_off),
+			       memif_get_buffer(pmd, d0) + src_off, cp_len);
+
+			mq->n_bytes += cp_len;
+			src_off += cp_len;
+			dst_off += cp_len;
+			src_len -= cp_len;
+		} while (src_len);
+
+		cur_slot++;
+		n_slots--;
+		if (d0->flags & MEMIF_DESC_FLAG_NEXT)
+			goto next_slot;
+
+		*bufs++ = mbuf_head;
+		n_rx_pkts++;
+	}
+
+ no_free_bufs:
+	if (type == MEMIF_RING_S2M) {
+		rte_mb();
+		ring->tail = cur_slot;
+		mq->last_head = cur_slot;
+	} else {
+		mq->last_tail = cur_slot;
+	}
+
+ refill:
+	if (type == MEMIF_RING_M2S) {
+		uint16_t head = ring->head;
+		n_slots = ring_size - head + mq->last_tail;
+
+		while (n_slots--) {
+			s0 = head++ & mask;
+			d0 = &ring->desc[s0];
+			d0->length = pmd->run.buffer_size;
+		}
+		rte_mb();
+		ring->head = head;
+	}
+
+	mq->n_pkts += n_rx_pkts;
+	return n_rx_pkts;
+}
+
+static uint16_t
+eth_memif_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
+{
+	struct memif_queue *mq = queue;
+	struct pmd_internals *pmd = mq->pmd;
+	if (unlikely((pmd->flags & ETH_MEMIF_FLAG_CONNECTED) == 0))
+		return 0;
+	memif_ring_t *ring = mq->ring;
+	if (unlikely(ring == NULL))
+		return 0;
+	uint16_t slot, saved_slot, n_free, ring_size, mask, n_tx_pkts = 0;
+	uint16_t src_len, src_off, dst_len, dst_off, cp_len;
+	memif_ring_type_t type = mq->type;
+	memif_desc_t *d0;
+	struct rte_mbuf *mbuf;
+	struct rte_mbuf *mbuf_head;
+
+	ring_size = 1 << mq->log2_ring_size;
+	mask = ring_size - 1;
+
+	n_free = ring->tail - mq->last_tail;
+	mq->last_tail += n_free;
+	slot = (type == MEMIF_RING_S2M) ? ring->head : ring->tail;
+
+	if (type == MEMIF_RING_S2M)
+		n_free = ring_size - ring->head + mq->last_tail;
+	else
+		n_free = ring->head - ring->tail;
+
+	while (n_free && n_tx_pkts < nb_pkts) {
+		mbuf_head = *bufs++;
+		mbuf = mbuf_head;
+
+		saved_slot = slot;
+		d0 = &ring->desc[slot & mask];
+		dst_off = 0;
+		dst_len =
+		    (type ==
+		     MEMIF_RING_S2M) ? pmd->run.buffer_size : d0->length;
+
+ next_in_chain:
+		src_off = 0;
+		src_len = rte_pktmbuf_data_len(mbuf);
+
+		while (src_len) {
+			if (dst_len == 0) {
+				if (n_free) {
+					slot++;
+					n_free--;
+					d0->flags |= MEMIF_DESC_FLAG_NEXT;
+					d0 = &ring->desc[slot & mask];
+					dst_off = 0;
+					dst_len = (type == MEMIF_RING_S2M) ?
+					    pmd->run.buffer_size : d0->length;
+					d0->flags = 0;
+				} else {
+					slot = saved_slot;
+					goto no_free_slots;
+				}
+			}
+			cp_len = RTE_MIN(dst_len, src_len);
+
+			memcpy(memif_get_buffer(pmd, d0) + dst_off,
+			       rte_pktmbuf_mtod_offset(mbuf, void *, src_off),
+			       cp_len);
+
+			mq->n_bytes += cp_len;
+			src_off += cp_len;
+			dst_off += cp_len;
+			src_len -= cp_len;
+			dst_len -= cp_len;
+
+			d0->length = dst_off;
+		}
+
+		if (rte_pktmbuf_is_contiguous(mbuf) == 0) {
+			mbuf = mbuf->next;
+			goto next_in_chain;
+		}
+
+		n_tx_pkts++;
+		slot++;
+		n_free--;
+		rte_pktmbuf_free(mbuf_head);
+	}
+
+ no_free_slots:
+	rte_mb();
+	if (type == MEMIF_RING_S2M)
+		ring->head = slot;
+	else
+		ring->tail = slot;
+
+	if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0) {
+		uint64_t a = 1;
+		ssize_t size = write(mq->intr_handle.fd, &a, sizeof(a));
+		if (unlikely(size < 0)) {
+			MIF_LOG(WARNING,
+				"%s: Failed to send interrupt on qid %ld: %s",
+				rte_vdev_device_name(pmd->vdev),
+				mq - pmd->tx_queues, strerror(errno));
+		}
+	}
+
+	mq->n_err += nb_pkts - n_tx_pkts;
+	mq->n_pkts += n_tx_pkts;
+	return n_tx_pkts;
+}
+
+void
+memif_free_regions(struct pmd_internals *pmd)
+{
+	int i;
+	struct memif_region *r;
+
+	for (i = 0; i < pmd->regions_num; i++) {
+		r = pmd->regions + i;
+		if (r == NULL)
+			return;
+		if (r->addr == NULL)
+			return;
+		munmap(r->addr, r->region_size);
+		if (r->fd > 0) {
+			close(r->fd);
+			r->fd = -1;
+		}
+	}
+	rte_free(pmd->regions);
+}
+
+static int
+memif_alloc_regions(struct pmd_internals *pmd, uint8_t brn)
+{
+	struct memif_region *r;
+	char shm_name[32];
+	int i;
+	int ret = 0;
+
+	r = rte_zmalloc("memif_region", sizeof(struct memif_region) * (brn + 1), 0);
+	if (r == NULL) {
+		MIF_LOG(ERR, "%s: Failed to allocate regions.",
+			rte_vdev_device_name(pmd->vdev));
+		return -ENOMEM;
+	}
+
+	pmd->regions = r;
+	pmd->regions_num = brn + 1;
+
+	/*
+	 * Create shm for every region. Region 0 is reserved for descriptors.
+	 * Other regions contain buffers.
+	 */
+	for (i = 0; i < (brn + 1); i++) {
+		r = &pmd->regions[i];
+
+		r->buffer_offset = (i == 0) ? (pmd->run.num_s2m_rings +
+					       pmd->run.num_m2s_rings) *
+		    (sizeof(memif_ring_t) +
+		     sizeof(memif_desc_t) * (1 << pmd->run.log2_ring_size)) : 0;
+		r->region_size = (i == 0) ? r->buffer_offset :
+		    (uint32_t)(pmd->run.buffer_size *
+				(1 << pmd->run.log2_ring_size) *
+				(pmd->run.num_s2m_rings +
+				 pmd->run.num_m2s_rings));
+
+		memset(shm_name, 0, sizeof(char) * 32);
+		sprintf(shm_name, "memif region %d", i);
+
+		r->fd = memfd_create(shm_name, MFD_ALLOW_SEALING);
+		if (r->fd < 0) {
+			MIF_LOG(ERR, "%s: Failed to create shm file: %s.",
+				rte_vdev_device_name(pmd->vdev),
+				strerror(errno));
+			return -1;
+		}
+
+		ret = fcntl(r->fd, F_ADD_SEALS, F_SEAL_SHRINK);
+		if (ret < 0) {
+			MIF_LOG(ERR, "%s: Failed to add seals to shm file: %s.",
+				rte_vdev_device_name(pmd->vdev),
+				strerror(errno));
+			return -1;
+		}
+
+		ret = ftruncate(r->fd, r->region_size);
+		if (ret < 0) {
+			MIF_LOG(ERR, "%s: Failed to truncate shm file: %s.",
+				rte_vdev_device_name(pmd->vdev),
+				strerror(errno));
+			return -1;
+		}
+
+		r->addr = mmap(NULL, r->region_size, PROT_READ |
+			       PROT_WRITE, MAP_SHARED, r->fd, 0);
+		if (r->addr == NULL) {
+			MIF_LOG(ERR, "%s: Failed to mmap shm region: %s.",
+				rte_vdev_device_name(pmd->vdev),
+				strerror(errno));
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+static void
+memif_init_rings(struct pmd_internals *pmd)
+{
+	memif_ring_t *ring;
+	int i, j;
+
+	for (i = 0; i < pmd->run.num_s2m_rings; i++) {
+		ring = memif_get_ring(pmd, MEMIF_RING_S2M, i);
+		ring->head = 0;
+		ring->tail = 0;
+		ring->cookie = MEMIF_COOKIE;
+		ring->flags = 0;
+		for (j = 0; j < (1 << pmd->run.log2_ring_size); j++) {
+			uint16_t slot = i * (1 << pmd->run.log2_ring_size) + j;
+			ring->desc[j].region = 1;
+			ring->desc[j].offset = pmd->regions[1].buffer_offset +
+			    (uint32_t)(slot * pmd->run.buffer_size);
+			ring->desc[j].length = pmd->run.buffer_size;
+		}
+	}
+
+	for (i = 0; i < pmd->run.num_m2s_rings; i++) {
+		ring = memif_get_ring(pmd, MEMIF_RING_M2S, i);
+		ring->head = 0;
+		ring->tail = 0;
+		ring->cookie = MEMIF_COOKIE;
+		ring->flags = 0;
+		for (j = 0; j < (1 << pmd->run.log2_ring_size); j++) {
+			uint16_t slot = (i + pmd->run.num_s2m_rings) *
+			    (1 << pmd->run.log2_ring_size) + j;
+			ring->desc[j].region = 1;
+			ring->desc[j].offset = pmd->regions[1].buffer_offset +
+			    (uint32_t)(slot * pmd->run.buffer_size);
+			ring->desc[j].length = pmd->run.buffer_size;
+		}
+	}
+}
+
+static void
+memif_init_queues(struct pmd_internals *pmd)
+{
+	struct memif_queue *mq;
+	int i;
+
+	for (i = 0; i < pmd->run.num_s2m_rings; i++) {
+		mq = &pmd->tx_queues[i];
+		mq->ring = memif_get_ring(pmd, MEMIF_RING_S2M, i);
+		mq->log2_ring_size = pmd->run.log2_ring_size;
+		/* queues located only in region 0 */
+		mq->region = 0;
+		mq->offset = (void *)mq->ring - (void *)pmd->regions[0].addr;
+		mq->last_head = 0;
+		mq->last_tail = 0;
+		mq->intr_handle.fd = eventfd(0, EFD_NONBLOCK);
+		if (mq->intr_handle.fd < 0) {
+			MIF_LOG(WARNING,
+				"%s: Failed to create eventfd for tx queue %d: %s.",
+				rte_vdev_device_name(pmd->vdev), i,
+				strerror(errno));
+		}
+	}
+
+	for (i = 0; i < pmd->run.num_m2s_rings; i++) {
+		mq = &pmd->rx_queues[i];
+		mq->ring = memif_get_ring(pmd, MEMIF_RING_M2S, i);
+		mq->log2_ring_size = pmd->run.log2_ring_size;
+		/* queues located only in region 0 */
+		mq->region = 0;
+		mq->offset = (void *)mq->ring - (void *)pmd->regions[0].addr;
+		mq->last_head = 0;
+		mq->last_tail = 0;
+		mq->intr_handle.fd = eventfd(0, EFD_NONBLOCK);
+		if (mq->intr_handle.fd < 0) {
+			MIF_LOG(WARNING,
+				"%s: Failed to create eventfd for rx queue %d: %s.",
+				rte_vdev_device_name(pmd->vdev), i,
+				strerror(errno));
+		}
+	}
+}
+
+int
+memif_init_regions_and_queues(struct pmd_internals *pmd)
+{
+	int ret;
+
+	ret = memif_alloc_regions(pmd, /* num of buffer regions */ 1);
+	if (ret < 0)
+		return ret;
+
+	memif_init_rings(pmd);
+
+	memif_init_queues(pmd);
+
+	return 0;
+}
+
+int
+memif_connect(struct pmd_internals *pmd)
+{
+	struct rte_eth_dev *eth_dev =
+	    rte_eth_dev_allocated(rte_vdev_device_name(pmd->vdev));
+	struct memif_region *mr;
+	struct memif_queue *mq;
+	int i;
+
+	for (i = 0; i < pmd->regions_num; i++) {
+		mr = pmd->regions + i;
+		if (mr != NULL) {
+			if (mr->addr == NULL) {
+				if (mr->fd < 0)
+					return -1;
+				mr->addr = mmap(NULL, mr->region_size,
+						PROT_READ | PROT_WRITE,
+						MAP_SHARED, mr->fd, 0);
+				if (mr->addr == NULL)
+					return -1;
+			}
+		}
+	}
+
+	for (i = 0; i < pmd->run.num_s2m_rings; i++) {
+		mq = (pmd->role == MEMIF_ROLE_SLAVE) ?
+		    &pmd->tx_queues[i] : &pmd->rx_queues[i];
+		mq->ring = pmd->regions[mq->region].addr + mq->offset;
+		if (mq->ring->cookie != MEMIF_COOKIE) {
+			MIF_LOG(ERR, "%s: Wrong cookie",
+				rte_vdev_device_name(pmd->vdev));
+			return -1;
+		}
+		mq->ring->head = 0;
+		mq->ring->tail = 0;
+		mq->last_head = 0;
+		mq->last_tail = 0;
+		/* polling mode by default */
+		if (pmd->role == MEMIF_ROLE_MASTER)
+			mq->ring->flags = MEMIF_RING_FLAG_MASK_INT;
+	}
+	for (i = 0; i < pmd->run.num_m2s_rings; i++) {
+		mq = (pmd->role == MEMIF_ROLE_SLAVE) ?
+		    &pmd->rx_queues[i] : &pmd->tx_queues[i];
+		mq->ring = pmd->regions[mq->region].addr + mq->offset;
+		if (mq->ring->cookie != MEMIF_COOKIE) {
+			MIF_LOG(ERR, "%s: Wrong cookie",
+				rte_vdev_device_name(pmd->vdev));
+			return -1;
+		}
+		mq->ring->head = 0;
+		mq->ring->tail = 0;
+		mq->last_head = 0;
+		mq->last_tail = 0;
+		/* polling mode by default */
+		if (pmd->role == MEMIF_ROLE_SLAVE)
+			mq->ring->flags = MEMIF_RING_FLAG_MASK_INT;
+	}
+
+	pmd->flags &= ~ETH_MEMIF_FLAG_CONNECTING;
+	pmd->flags |= ETH_MEMIF_FLAG_CONNECTED;
+	eth_dev->data->dev_link.link_status = ETH_LINK_UP;
+	MIF_LOG(INFO, "%s: Connected.", rte_vdev_device_name(pmd->vdev));
+	return 0;
+}
+
+static int
+memif_dev_start(struct rte_eth_dev *dev)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	int ret = 0;
+
+	switch (pmd->role) {
+	case MEMIF_ROLE_SLAVE:
+		ret = memif_connect_slave(dev);
+		break;
+	case MEMIF_ROLE_MASTER:
+		ret = memif_connect_master(dev);
+		break;
+	default:
+		MIF_LOG(ERR, "%s: Unknown role: %d.",
+			rte_vdev_device_name(pmd->vdev), pmd->role);
+		ret = -1;
+		break;
+	}
+
+	return ret;
+}
+
+static int
+memif_dev_configure(struct rte_eth_dev *dev __rte_unused)
+{
+	return 0;
+}
+
+static int
+memif_tx_queue_setup(struct rte_eth_dev *dev,
+		     uint16_t qid,
+		     uint16_t nb_tx_desc __rte_unused,
+		     unsigned int socket_id __rte_unused,
+		     const struct rte_eth_txconf *tx_conf __rte_unused)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	struct memif_queue *mq;
+
+	mq = rte_realloc(pmd->tx_queues, sizeof(struct memif_queue) * (qid + 1),
+			 0);
+	if (mq == NULL) {
+		MIF_LOG(ERR, "%s: Failed to alloc tx queue %u.",
+			rte_vdev_device_name(pmd->vdev), qid);
+		return -ENOMEM;
+	}
+
+	pmd->tx_queues = mq;
+
+	mq->type =
+	    (pmd->role == MEMIF_ROLE_SLAVE) ? MEMIF_RING_S2M : MEMIF_RING_M2S;
+	mq->n_pkts = 0;
+	mq->n_bytes = 0;
+	mq->n_err = 0;
+	mq->intr_handle.fd = -1;
+	mq->intr_handle.type = RTE_INTR_HANDLE_EXT;
+	mq->pmd = pmd;
+	dev->data->tx_queues[qid] = mq;
+
+	return 0;
+}
+
+static int
+memif_rx_queue_setup(struct rte_eth_dev *dev,
+		     uint16_t qid,
+		     uint16_t nb_rx_desc __rte_unused,
+		     unsigned int socket_id __rte_unused,
+		     const struct rte_eth_rxconf *rx_conf __rte_unused,
+		     struct rte_mempool *mb_pool)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	struct memif_queue *mq;
+
+	mq = rte_realloc(pmd->rx_queues, sizeof(struct memif_queue) * (qid + 1),
+			 0);
+	if (mq == NULL) {
+		MIF_LOG(ERR, "%s: Failed to alloc rx queue %u.",
+			rte_vdev_device_name(pmd->vdev), qid);
+		return -ENOMEM;
+	}
+
+	pmd->rx_queues = mq;
+
+	mq->type =
+	    (pmd->role == MEMIF_ROLE_SLAVE) ? MEMIF_RING_M2S : MEMIF_RING_S2M;
+	mq->n_pkts = 0;
+	mq->n_bytes = 0;
+	mq->n_err = 0;
+	mq->intr_handle.fd = -1;
+	mq->intr_handle.type = RTE_INTR_HANDLE_EXT;
+	mq->mempool = mb_pool;
+	mq->in_port = dev->data->port_id;
+	mq->pmd = pmd;
+	dev->data->rx_queues[qid] = mq;
+
+	return 0;
+}
+
+static int
+memif_link_update(struct rte_eth_dev *dev __rte_unused,
+		  int wait_to_complete __rte_unused)
+{
+	return 0;
+}
+
+static int
+memif_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	struct memif_queue *mq;
+	int i;
+
+	stats->ipackets = 0;
+	stats->ibytes = 0;
+	stats->opackets = 0;
+	stats->obytes = 0;
+	stats->oerrors = 0;
+
+	uint8_t tmp = (pmd->role == MEMIF_ROLE_SLAVE) ? pmd->run.num_s2m_rings :
+	    pmd->run.num_m2s_rings;
+	uint8_t nq = (tmp < RTE_ETHDEV_QUEUE_STAT_CNTRS) ? tmp :
+	    RTE_ETHDEV_QUEUE_STAT_CNTRS;
+
+	/* RX stats */
+	for (i = 0; i < nq; i++) {
+		mq = &pmd->rx_queues[i];
+		stats->q_ipackets[i] = mq->n_pkts;
+		stats->q_ibytes[i] = mq->n_bytes;
+		stats->ipackets += mq->n_pkts;
+		stats->ibytes += mq->n_bytes;
+	}
+
+	tmp = (pmd->role == MEMIF_ROLE_SLAVE) ? pmd->run.num_m2s_rings :
+	    pmd->run.num_s2m_rings;
+	nq = (tmp < RTE_ETHDEV_QUEUE_STAT_CNTRS) ? tmp :
+	    RTE_ETHDEV_QUEUE_STAT_CNTRS;
+
+	/* TX stats */
+	for (i = 0; i < nq; i++) {
+		mq = &pmd->tx_queues[i];
+		stats->q_opackets[i] = mq->n_pkts;
+		stats->q_obytes[i] = mq->n_bytes;
+		stats->q_errors[i] = mq->n_err;
+		stats->opackets += mq->n_pkts;
+		stats->obytes += mq->n_bytes;
+		stats->oerrors += mq->n_err;
+	}
+	return 0;
+}
+
+static void
+memif_stats_reset(struct rte_eth_dev *dev)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	int i;
+	struct memif_queue *mq;
+
+	for (i = 0; i < pmd->run.num_s2m_rings; i++) {
+		mq = (pmd->role == MEMIF_ROLE_SLAVE) ? &pmd->tx_queues[i] :
+		    &pmd->rx_queues[i];
+		mq->n_pkts = 0;
+		mq->n_bytes = 0;
+		mq->n_err = 0;
+	}
+	for (i = 0; i < pmd->run.num_m2s_rings; i++) {
+		mq = (pmd->role == MEMIF_ROLE_SLAVE) ? &pmd->rx_queues[i] :
+		    &pmd->tx_queues[i];
+		mq->n_pkts = 0;
+		mq->n_bytes = 0;
+		mq->n_err = 0;
+	}
+}
+
+static int
+memif_rx_queue_intr_enable(struct rte_eth_dev *dev, uint16_t qid __rte_unused)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+
+	MIF_LOG(WARNING, "%s: Interrupt mode not supported.",
+		rte_vdev_device_name(pmd->vdev));
+
+	/* Enable MEMIF interrupts. */
+	/* pmd->rx_queues[qid].ring->flags  &= ~MEMIF_RING_FLAG_MASK_INT; */
+
+	/*
+	 * TODO: Tell dpdk to use interrupt mode.
+	 *
+	 * return rte_intr_enable(&pmd->rx_queues[qid].intr_handle);
+	 */
+	return -1;
+}
+
+static int
+memif_rx_queue_intr_disable(struct rte_eth_dev *dev, uint16_t qid __rte_unused)
+{
+	struct pmd_internals *pmd __rte_unused = dev->data->dev_private;
+
+	/* Disable MEMIF interrupts. */
+	/* pmd->rx_queues[qid].ring->flags |= MEMIF_RING_FLAG_MASK_INT; */
+
+	/*
+	 * TODO: Tell dpdk to use polling mode.
+	 *
+	 * return rte_intr_disable(&pmd->rx_queues[qid].intr_handle);
+	 */
+	return 0;
+}
+
+static const struct eth_dev_ops ops = {
+	.dev_start = memif_dev_start,
+	.dev_infos_get = memif_dev_info,
+	.dev_configure = memif_dev_configure,
+	.tx_queue_setup = memif_tx_queue_setup,
+	.rx_queue_setup = memif_rx_queue_setup,
+	.rx_queue_intr_enable = memif_rx_queue_intr_enable,
+	.rx_queue_intr_disable = memif_rx_queue_intr_disable,
+	.link_update = memif_link_update,
+	.stats_get = memif_stats_get,
+	.stats_reset = memif_stats_reset,
+};
+
+static int
+memif_create(struct rte_vdev_device *vdev, enum memif_role_t role,
+	     memif_interface_id_t id, uint32_t flags,
+	     const char *socket_filename,
+	     memif_log2_ring_size_t log2_ring_size, uint8_t nrxq,
+	     uint8_t ntxq, uint16_t buffer_size, const char *secret,
+	     const char *eth_addr)
+{
+	int ret = 0;
+	struct rte_eth_dev *eth_dev;
+	struct rte_eth_dev_data *data;
+	struct pmd_internals *pmd;
+	const unsigned int numa_node = vdev->device.numa_node;
+	const char *name = rte_vdev_device_name(vdev);
+
+	if (flags & ETH_MEMIF_FLAG_ZERO_COPY) {
+		MIF_LOG(ERR, "Zero-copy not supported.");
+		return -1;
+	}
+
+	eth_dev = rte_eth_vdev_allocate(vdev, sizeof(*pmd));
+	if (eth_dev == NULL) {
+		MIF_LOG(ERR, "%s: Unable to allocate device struct.", name);
+		return -1;
+	}
+
+	pmd = eth_dev->data->dev_private;
+	memset(pmd, 0, sizeof(*pmd));
+
+	pmd->if_index = id;
+	pmd->vdev = vdev;
+	pmd->id = id;
+	pmd->flags = flags;
+	pmd->flags |= ETH_MEMIF_FLAG_DISABLED;
+	pmd->role = role;
+	ret = memif_socket_init(eth_dev, socket_filename);
+	if (ret < 0)
+		return ret;
+
+	memset(pmd->secret, 0, sizeof(char) * 24);
+	if (secret != NULL)
+		strlcpy(pmd->secret, secret, sizeof(pmd->secret));
+
+	pmd->cfg.log2_ring_size = ETH_MEMIF_DEFAULT_RING_SIZE;
+	if (log2_ring_size != 0)
+		pmd->cfg.log2_ring_size = log2_ring_size;
+	pmd->cfg.num_s2m_rings = ETH_MEMIF_DEFAULT_NRXQ;
+	pmd->cfg.num_m2s_rings = ETH_MEMIF_DEFAULT_NTXQ;
+
+	if (nrxq != 0) {
+		if (role == MEMIF_ROLE_SLAVE)
+			pmd->cfg.num_m2s_rings = nrxq;
+		else
+			pmd->cfg.num_s2m_rings = nrxq;
+	}
+	if (ntxq != 0) {
+		if (role == MEMIF_ROLE_SLAVE)
+			pmd->cfg.num_s2m_rings = ntxq;
+		else
+			pmd->cfg.num_m2s_rings = ntxq;
+	}
+
+	pmd->cfg.buffer_size = ETH_MEMIF_DEFAULT_BUFFER_SIZE;
+	if (buffer_size != 0)
+		pmd->cfg.buffer_size = buffer_size;
+
+	/* FIXME: generate mac? */
+	if (eth_addr == NULL)
+		eth_addr = ETH_MEMIF_DEFAULT_ETH_ADDR;
+
+	ret = sscanf(eth_addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+	       &pmd->eth_addr.addr_bytes[0], &pmd->eth_addr.addr_bytes[1],
+	       &pmd->eth_addr.addr_bytes[2], &pmd->eth_addr.addr_bytes[3],
+	       &pmd->eth_addr.addr_bytes[4], &pmd->eth_addr.addr_bytes[5]);
+	if (ret != 6) {
+		MIF_LOG(WARNING, "%s: Failed to parse mac '%s'.",
+			rte_vdev_device_name(vdev), eth_addr);
+	}
+
+	data = eth_dev->data;
+	data->dev_private = pmd;
+	data->numa_node = numa_node;
+	data->mac_addrs = &pmd->eth_addr;
+
+	eth_dev->dev_ops = &ops;
+	eth_dev->device = &vdev->device;
+	eth_dev->rx_pkt_burst = eth_memif_rx;
+	eth_dev->tx_pkt_burst = eth_memif_tx;
+
+	rte_eth_dev_probing_finish(eth_dev);
+
+	return 0;
+}
+
+static int
+memif_set_role(const char *key __rte_unused, const char *value,
+	       void *extra_args)
+{
+	enum memif_role_t *role = (enum memif_role_t *)extra_args;
+	if (strstr(value, "master") != NULL) {
+		*role = MEMIF_ROLE_MASTER;
+	} else if (strstr(value, "slave") != NULL) {
+		*role = MEMIF_ROLE_SLAVE;
+	} else {
+		MIF_LOG(ERR, "Unknown role: %s.", value);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int
+memif_set_zc(const char *key __rte_unused, const char *value, void *extra_args)
+{
+	uint32_t *flags = (uint32_t *)extra_args;
+
+	if (strstr(value, "yes") != NULL) {
+		*flags |= ETH_MEMIF_FLAG_ZERO_COPY;
+	} else if (strstr(value, "no") != NULL) {
+		*flags &= ~ETH_MEMIF_FLAG_ZERO_COPY;
+	} else {
+		MIF_LOG(ERR, "Failed to parse zero-copy param: %s.", value);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int
+memif_set_id(const char *key __rte_unused, const char *value, void *extra_args)
+{
+	memif_interface_id_t *id = (memif_interface_id_t *)extra_args;
+	/* even if parsing fails, 0 is a valid id */
+	*id = strtoul(value, NULL, 10);
+	return 0;
+}
+
+static int
+memif_set_bs(const char *key __rte_unused, const char *value, void *extra_args)
+{
+	unsigned long tmp;
+	uint16_t *buffer_size = (uint16_t *)extra_args;
+
+	tmp = strtoul(value, NULL, 10);
+	if (tmp == 0 || tmp > 0xFFFF) {
+		MIF_LOG(ERR, "Invalid buffer size: %s.", value);
+		return -EINVAL;
+	}
+	*buffer_size = tmp;
+	return 0;
+}
+
+static int
+memif_set_rs(const char *key __rte_unused, const char *value, void *extra_args)
+{
+	unsigned long tmp;
+	memif_log2_ring_size_t *log2_ring_size =
+	    (memif_log2_ring_size_t *)extra_args;
+
+	tmp = strtoul(value, NULL, 10);
+	if (tmp == 0 || tmp > ETH_MEMIF_MAX_LOG2_RING_SIZE) {
+		MIF_LOG(ERR, "Invalid ring size: %s (max %u).",
+			value, ETH_MEMIF_MAX_LOG2_RING_SIZE);
+		return -EINVAL;
+	}
+	*log2_ring_size = tmp;
+	return 0;
+}
+
+static int
+memif_set_nq(const char *key __rte_unused, const char *value, void *extra_args)
+{
+	unsigned long tmp;
+	uint16_t *nq = (uint16_t *)extra_args;
+
+	tmp = strtoul(value, NULL, 10);
+	if (tmp == 0 || tmp > 0xFF) {
+		MIF_LOG(ERR, "Invalid number of queues: %s.", value);
+		return -EINVAL;
+	}
+	*nq = tmp;
+	return 0;
+}
+
+/* check if directory exists and if we have permission to read/write */
+static int
+memif_check_socket_filename(const char *filename)
+{
+	char *dir = NULL, *tmp;
+	uint32_t idx;
+	int ret = 0;
+
+	tmp = strrchr(filename, '/');
+	if (tmp != NULL) {
+		idx = tmp - filename;
+		dir = rte_zmalloc("memif_tmp", sizeof(char) * (idx + 1), 0);
+		if (dir == NULL) {
+			MIF_LOG(ERR, "Failed to allocate memory.");
+			return -1;
+		}
+		strlcpy(dir, filename, sizeof(char) * (idx + 1));
+	}
+
+	if (dir == NULL || (faccessat(-1, dir, F_OK | R_OK |
+					W_OK, AT_EACCESS) < 0)) {
+		MIF_LOG(ERR, "Invalid directory: '%s'.", dir);
+		ret = -EINVAL;
+	}
+
+	if (dir != NULL)
+		rte_free(dir);
+
+	return ret;
+}
+
+static int
+rte_pmd_memif_probe(struct rte_vdev_device *vdev)
+{
+	RTE_BUILD_BUG_ON(sizeof(memif_msg_t) != 128);
+	RTE_BUILD_BUG_ON(sizeof(memif_desc_t) != 16);
+	int ret = 0;
+	unsigned int i;
+	struct rte_kvargs *kvlist;
+	const struct rte_kvargs_pair *pair;
+
+	const char *name = rte_vdev_device_name(vdev);
+
+	enum memif_role_t role;
+	memif_interface_id_t id;
+
+	uint16_t buffer_size;
+	memif_log2_ring_size_t log2_ring_size;
+	uint8_t nrxq, ntxq;
+	const char *socket_filename;
+	const char *eth_addr;
+	uint32_t flags;
+	const char *secret;
+
+	MIF_LOG(INFO, "Initialize MEMIF: %s.", name);
+
+	kvlist = rte_kvargs_parse(rte_vdev_device_args(vdev), valid_arguments);
+
+	/* set default values */
+	role = MEMIF_ROLE_SLAVE;
+	flags = 0;
+	id = 0;
+	buffer_size = 2048;
+	log2_ring_size = 10;
+	nrxq = 1;
+	ntxq = 1;
+	socket_filename = ETH_MEMIF_DEFAULT_SOCKET_FILENAME;
+	secret = NULL;
+	eth_addr = NULL;
+
+	/* parse parameters */
+	if (kvlist != NULL) {
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_ROLE_ARG) == 1) {
+			ret = rte_kvargs_process(kvlist, ETH_MEMIF_ROLE_ARG,
+						 &memif_set_role, &role);
+			if (ret < 0)
+				goto exit;
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_ID_ARG) == 1) {
+			ret = rte_kvargs_process(kvlist, ETH_MEMIF_ID_ARG,
+						 &memif_set_id, &id);
+			if (ret < 0)
+				goto exit;
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_BUFFER_SIZE_ARG) == 1) {
+			ret =
+			    rte_kvargs_process(kvlist,
+					       ETH_MEMIF_BUFFER_SIZE_ARG,
+					       &memif_set_bs, &buffer_size);
+			if (ret < 0)
+				goto exit;
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_RING_SIZE_ARG) == 1) {
+			ret =
+			    rte_kvargs_process(kvlist, ETH_MEMIF_RING_SIZE_ARG,
+					       &memif_set_rs, &log2_ring_size);
+			if (ret < 0)
+				goto exit;
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_NRXQ_ARG) == 1) {
+			ret = rte_kvargs_process(kvlist, ETH_MEMIF_NRXQ_ARG,
+						 &memif_set_nq, &nrxq);
+			if (ret < 0)
+				goto exit;
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_NTXQ_ARG) == 1) {
+			ret = rte_kvargs_process(kvlist, ETH_MEMIF_NTXQ_ARG,
+						 &memif_set_nq, &ntxq);
+			if (ret < 0)
+				goto exit;
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_SOCKET_ARG) == 1) {
+			for (i = 0; i < kvlist->count; i++) {
+				pair = &kvlist->pairs[i];
+				if (strcmp(pair->key, ETH_MEMIF_SOCKET_ARG) == 0) {
+					socket_filename = pair->value;
+					ret = memif_check_socket_filename(
+						socket_filename);
+					if (ret < 0)
+						goto exit;
+				}
+			}
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_MAC_ARG) == 1) {
+			for (i = 0; i < kvlist->count; i++) {
+				pair = &kvlist->pairs[i];
+				if (strcmp(pair->key, ETH_MEMIF_MAC_ARG) == 0)
+					eth_addr = pair->value;
+			}
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_ZC_ARG) == 1) {
+			ret = rte_kvargs_process(kvlist, ETH_MEMIF_ZC_ARG,
+						 &memif_set_zc, &flags);
+			if (ret < 0)
+				goto exit;
+		}
+		if (rte_kvargs_count(kvlist, ETH_MEMIF_SECRET_ARG) == 1) {
+			for (i = 0; i < kvlist->count; i++) {
+				pair = &kvlist->pairs[i];
+				if (strcmp(pair->key, ETH_MEMIF_SECRET_ARG) == 0)
+					secret = pair->value;
+			}
+		}
+	}
+
+	/* create interface */
+	ret =
+	    memif_create(vdev, role, id, flags, socket_filename, log2_ring_size,
+			 nrxq, ntxq, buffer_size, secret, eth_addr);
+
+ exit:
+	if (kvlist != NULL)
+		rte_kvargs_free(kvlist);
+	return ret;
+}
+
+static int
+rte_pmd_memif_remove(struct rte_vdev_device *vdev)
+{
+	struct rte_eth_dev *eth_dev;
+
+	eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(vdev));
+	if (eth_dev == NULL)
+		return 0;
+
+	struct pmd_internals *pmd = eth_dev->data->dev_private;
+
+	memif_msg_enq_disconnect(pmd->cc, "Invalid message size", 0);
+	memif_disconnect(eth_dev);
+
+	memif_socket_remove_device(pmd);
+
+	pmd->vdev = NULL;
+
+	rte_free(eth_dev->data->dev_private);
+
+	rte_eth_dev_release_port(eth_dev);
+
+	return 0;
+}
+
+static struct rte_vdev_driver pmd_memif_drv = {
+	.probe = rte_pmd_memif_probe,
+	.remove = rte_pmd_memif_remove,
+};
+
+RTE_PMD_REGISTER_VDEV(net_memif, pmd_memif_drv);
+RTE_PMD_REGISTER_ALIAS(net_memif, eth_memif);
+RTE_PMD_REGISTER_PARAM_STRING(net_memif,
+			      ETH_MEMIF_ID_ARG "=<int>"
+			      ETH_MEMIF_ROLE_ARG "=<string>"
+			      ETH_MEMIF_BUFFER_SIZE_ARG "=<int>"
+			      ETH_MEMIF_RING_SIZE_ARG "=<int>"
+			      ETH_MEMIF_NRXQ_ARG "=<int>"
+			      ETH_MEMIF_NTXQ_ARG "=<int>"
+			      ETH_MEMIF_SOCKET_ARG "=<string>"
+			      ETH_MEMIF_MAC_ARG "=xx:xx:xx:xx:xx:xx"
+			      ETH_MEMIF_ZC_ARG "=<string>"
+			      ETH_MEMIF_SECRET_ARG "=<string>");
+
+RTE_INIT(memif_init_log)
+{
+	memif_logtype = rte_log_register("pmd.net.memif");
+	if (memif_logtype >= 0)
+		rte_log_set_level(memif_logtype, RTE_LOG_NOTICE);
+}
diff --git a/drivers/net/memif/rte_eth_memif.h b/drivers/net/memif/rte_eth_memif.h
new file mode 100644
index 000000000..e122b2bb7
--- /dev/null
+++ b/drivers/net/memif/rte_eth_memif.h
@@ -0,0 +1,207 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 Cisco Systems, Inc.  All rights reserved.
+ */
+
+#ifndef _RTE_ETH_MEMIF_H_
+#define _RTE_ETH_MEMIF_H_
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif				/* GNU_SOURCE */
+
+#include <sys/queue.h>
+
+#include <rte_ethdev_driver.h>
+#include <rte_ether.h>
+#include <rte_interrupts.h>
+
+#include <memif.h>
+
+/* generate mac? */
+#define ETH_MEMIF_DEFAULT_ETH_ADDR		"01:ab:23:cd:45:ef"
+
+#define ETH_MEMIF_DEFAULT_SOCKET_FILENAME	"/tmp/memif.sock"
+#define ETH_MEMIF_DEFAULT_RING_SIZE		10
+#define ETH_MEMIF_DEFAULT_NRXQ			1
+#define ETH_MEMIF_DEFAULT_NTXQ			1
+#define ETH_MEMIF_DEFAULT_BUFFER_SIZE		2048
+
+#define ETH_MEMIF_MAX_NUM_Q_PAIRS		256
+#define ETH_MEMIF_MAX_LOG2_RING_SIZE		14
+#define ETH_MEMIF_MAX_REGION_IDX		255
+
+int memif_logtype;
+
+#define MIF_LOG(level, fmt, args...) \
+	rte_log(RTE_LOG_ ## level, memif_logtype, \
+		"%s(): " fmt "\n", __func__, ##args)
+
+enum memif_role_t {
+	MEMIF_ROLE_MASTER = 0,
+	MEMIF_ROLE_SLAVE = 1,
+};
+
+struct memif_region {
+	void *addr;				/**< shared memory address */
+	memif_region_size_t region_size;	/**< shared memory size */
+	int fd;					/**< shared memory file descriptor */
+	uint32_t buffer_offset;			/**< offset at which buffers start */
+};
+
+struct memif_queue {
+	struct rte_mempool *mempool;		/**< mempool for RX packets */
+	uint16_t in_port;			/**< port id */
+
+	struct pmd_internals *pmd;		/**< device internals */
+
+	struct rte_intr_handle intr_handle;	/**< interrupt handle */
+
+	/* ring info */
+	memif_ring_type_t type;			/**< ring type */
+	memif_ring_t *ring;			/**< pointer to ring */
+	memif_log2_ring_size_t log2_ring_size;	/**< log2 of ring size */
+
+	memif_region_index_t region;		/**< shared memory region index */
+	memif_region_offset_t offset;		/**< offset at which the queue begins */
+
+	uint16_t last_head;			/**< last ring head */
+	uint16_t last_tail;			/**< last ring tail */
+	/*uint32_t *buffers;*/
+
+	/* rx/tx info */
+	uint64_t n_pkts;			/**< number of rx/tx packets */
+	uint64_t n_bytes;			/**< number of rx/tx bytes */
+	uint64_t n_err;				/**< number of tx errors */
+};
+
+struct pmd_internals {
+	int if_index;				/**< index */
+	memif_interface_id_t id;		/**< unique id */
+	enum memif_role_t role;			/**< device role */
+	uint32_t flags;				/**< device status flags */
+#define ETH_MEMIF_FLAG_CONNECTING	(1 << 0)
+/**< device is connecting */
+#define ETH_MEMIF_FLAG_CONNECTED	(1 << 1)
+/**< device is connected */
+#define ETH_MEMIF_FLAG_ZERO_COPY	(1 << 2)
+/**< device is zero-copy enabled */
+#define ETH_MEMIF_FLAG_DISABLED		(1 << 3)
+/**< device has not been configured and can not accept connection requests */
+
+	struct ether_addr eth_addr;		/**< mac address */
+	char *socket_filename;			/**< pointer to socket filename */
+	char secret[24]; /**< secret (optional security parameter) */
+
+	struct memif_control_channel *cc;	/**< control channel */
+
+	struct memif_region *regions;		/**< shared memory regions */
+	uint8_t regions_num;			/**< number of regions */
+
+	struct memif_queue *rx_queues;		/**< RX queues */
+	struct memif_queue *tx_queues;		/**< TX queues */
+
+	/* remote info */
+	char remote_name[64];			/**< remote app name */
+	char remote_if_name[64];		/**< remote peer name */
+
+	struct {
+		memif_log2_ring_size_t log2_ring_size; /**< log2 of ring size */
+		uint8_t num_s2m_rings;		/**< number of slave to master rings */
+		uint8_t num_m2s_rings;		/**< number of master to slave rings */
+		uint16_t buffer_size;		/**< buffer size */
+	} cfg;					/**< Configured parameters (max values) */
+
+	struct {
+		memif_log2_ring_size_t log2_ring_size; /**< log2 of ring size */
+		uint8_t num_s2m_rings;		/**< number of slave to master rings */
+		uint8_t num_m2s_rings;		/**< number of master to slave rings */
+		uint16_t buffer_size;		/**< buffer size */
+	} run;
+	/**< Parameters used in active connection */
+
+	char local_disc_string[96];		/**< local disconnect reason */
+	char remote_disc_string[96];		/**< remote disconnect reason */
+
+	struct rte_vdev_device *vdev;		/**< vdev handle */
+};
+
+/**
+ * Unmap shared memory and free regions from memory.
+ *
+ * @param pmd
+ *   device internals
+ */
+void memif_free_regions(struct pmd_internals *pmd);
+
+/**
+ * Finalize connection establishment process. Map shared memory file
+ * (master role), initialize ring queue, set link status up.
+ *
+ * @param pmd
+ *   device internals
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+int memif_connect(struct pmd_internals *pmd);
+
+/**
+ * Create shared memory file and initialize ring queue.
+ * Only called by slave when establishing connection
+ *
+ * @param pmd
+ *   device internals
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+int memif_init_regions_and_queues(struct pmd_internals *pmd);
+
+/**
+ * Get memif version string.
+ *
+ * @return
+ *   - memif version string
+ */
+const char *memif_version(void);
+
+#ifndef MFD_HUGETLB
+#ifndef __NR_memfd_create
+
+#if defined __x86_64__
+#define __NR_memfd_create 319
+#elif defined __arm__
+#define __NR_memfd_create 385
+#elif defined __aarch64__
+#define __NR_memfd_create 279
+#else
+#error "__NR_memfd_create unknown for this architecture"
+#endif
+
+#endif				/* __NR_memfd_create */
+
+static inline int memfd_create(const char *name, unsigned int flags)
+{
+	return syscall(__NR_memfd_create, name, flags);
+}
+#endif				/* MFD_HUGETLB */
+
+#ifndef F_LINUX_SPECIFIC_BASE
+#define F_LINUX_SPECIFIC_BASE 1024
+#endif
+
+#ifndef MFD_ALLOW_SEALING
+#define MFD_ALLOW_SEALING       0x0002U
+#endif
+
+#ifndef F_ADD_SEALS
+#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
+#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
+
+#define F_SEAL_SEAL     0x0001	/* prevent further seals from being set */
+#define F_SEAL_SHRINK   0x0002	/* prevent file from shrinking */
+#define F_SEAL_GROW     0x0004	/* prevent file from growing */
+#define F_SEAL_WRITE    0x0008	/* prevent writes */
+#endif
+
+#endif				/* RTE_ETH_MEMIF_H */
diff --git a/drivers/net/memif/rte_pmd_memif_version.map b/drivers/net/memif/rte_pmd_memif_version.map
new file mode 100644
index 000000000..97fd251df
--- /dev/null
+++ b/drivers/net/memif/rte_pmd_memif_version.map
@@ -0,0 +1,4 @@ 
+DPDK_19.02 {
+
+        local: *;
+};
diff --git a/drivers/net/meson.build b/drivers/net/meson.build
index 980eec233..b0becbf31 100644
--- a/drivers/net/meson.build
+++ b/drivers/net/meson.build
@@ -21,6 +21,7 @@  drivers = ['af_packet',
 	'ixgbe',
 	'kni',
 	'liquidio',
+	'memif',
 	'mlx4',
 	'mlx5',
 	'mvneta',
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index 5699d979d..f236c5ebc 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -168,6 +168,7 @@  ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
 _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_KNI)        += -lrte_pmd_kni
 endif
 _LDLIBS-$(CONFIG_RTE_LIBRTE_LIO_PMD)        += -lrte_pmd_lio
+_LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_MEMIF)      += -lrte_pmd_memif
 ifeq ($(CONFIG_RTE_LIBRTE_MLX4_DLOPEN_DEPS),y)
 _LDLIBS-$(CONFIG_RTE_LIBRTE_MLX4_PMD)       += -lrte_pmd_mlx4 -ldl
 else