memif: complete refactor of socket handling code

Change-Id: I4d41def83a23f13701f1ddcea722d481e4c85cbc
Signed-off-by: Damjan Marion <damarion@cisco.com>

10 files changed, 1795 insertions, 1146 deletions

diff --git a/src/plugins/memif/cli.c b/src/plugins/memif/cli.c
index 88c09e98..2d126aac 100644
--- a/src/plugins/memif/cli.c
+++ b/src/plugins/memif/cli.c
@@ -24,20 +24,7 @@
 #include <vnet/ethernet/ethernet.h>
 
 #include <memif/memif.h>
-
-static uword
-unformat_memif_queues (unformat_input_t * input, va_list * args)
-{
-  u32 *rx_queues = va_arg (*args, u32 *);
-  u32 *tx_queues = va_arg (*args, u32 *);
-
-  if (unformat (input, "rx-queues %u", rx_queues))
-    ;
-  if (unformat (input, "tx-queues %u", tx_queues))
-    ;
-
-  return 1;
-}
+#include <memif/private.h>
 
 static clib_error_t *
 memif_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
@@ -57,18 +44,23 @@ memif_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
 
   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
     {
-      if (unformat (line_input, "key 0x%" PRIx64, &args.key))
+      if (unformat (line_input, "id %u", &args.id))
 	;
       else if (unformat (line_input, "socket %s", &args.socket_filename))
 	;
+      else if (unformat (line_input, "secret %s", &args.secret))
+	;
       else if (unformat (line_input, "ring-size %u", &ring_size))
 	;
+      else if (unformat (line_input, "rx-queues %u", &rx_queues))
+	;
+      else if (unformat (line_input, "tx-queues %u", &tx_queues))
+	;
       else if (unformat (line_input, "buffer-size %u", &args.buffer_size))
 	;
       else if (unformat (line_input, "master"))
 	args.is_master = 1;
-      else if (unformat (line_input, "slave %U",
-			 unformat_memif_queues, &rx_queues, &tx_queues))
+      else if (unformat (line_input, "slave"))
 	args.is_master = 0;
       else if (unformat (line_input, "hw-addr %U",
 			 unformat_ethernet_address, args.hw_addr))
@@ -94,6 +86,9 @@ memif_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
 
   r = memif_create_if (vm, &args);
 
+  vec_free (args.socket_filename);
+  vec_free (args.secret);
+
   if (r <= VNET_API_ERROR_SYSCALL_ERROR_1
       && r >= VNET_API_ERROR_SYSCALL_ERROR_10)
     return clib_error_return (0, "%s (errno %d)", strerror (errno), errno);
@@ -102,7 +97,7 @@ memif_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
     return clib_error_return (0, "Invalid interface name");
 
   if (r == VNET_API_ERROR_SUBIF_ALREADY_EXISTS)
-    return clib_error_return (0, "Interface already exists");
+    return clib_error_return (0, "Interface with same id already exists");
 
   return 0;
 }
@@ -110,9 +105,9 @@ memif_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
 /* *INDENT-OFF* */
 VLIB_CLI_COMMAND (memif_create_command, static) = {
   .path = "create memif",
-  .short_help = "create memif [key <key>] [socket <path>] "
+  .short_help = "create memif [id <id>] [socket <path>] "
                 "[ring-size <size>] [buffer-size <size>] [hw-addr <mac-address>] "
-		"<master|slave [rx-queues <number>] [tx-queues <number>]>",
+		"<master|slave> [rx-queues <number>] [tx-queues <number>]",
   .function = memif_create_command_fn,
 };
 /* *INDENT-ON* */
@@ -122,8 +117,11 @@ memif_delete_command_fn (vlib_main_t * vm, unformat_input_t * input,
 			 vlib_cli_command_t * cmd)
 {
   unformat_input_t _line_input, *line_input = &_line_input;
-  u64 key = 0;
-  u8 key_defined = 0;
+  u32 sw_if_index = ~0;
+  vnet_hw_interface_t *hw;
+  memif_main_t *mm = &memif_main;
+  memif_if_t *mif;
+  vnet_main_t *vnm = vnet_get_main ();
 
   /* Get a line of input. */
   if (!unformat_user (input, unformat_line_input, line_input))
@@ -131,18 +129,27 @@ memif_delete_command_fn (vlib_main_t * vm, unformat_input_t * input,
 
   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
     {
-      if (unformat (line_input, "key 0x%" PRIx64, &key))
-	key_defined = 1;
+      if (unformat (line_input, "sw_if_index %d", &sw_if_index))
+	;
+      else if (unformat (line_input, "%U", unformat_vnet_sw_interface,
+			 vnm, &sw_if_index))
+	;
       else
 	return clib_error_return (0, "unknown input `%U'",
 				  format_unformat_error, input);
     }
   unformat_free (line_input);
 
-  if (!key_defined)
-    return clib_error_return (0, "missing key");
+  if (sw_if_index == ~0)
+    return clib_error_return (0,
+			      "please specify interface name or sw_if_index");
+
+  hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
+  if (hw == NULL || memif_device_class.index != hw->dev_class_index)
+    return clib_error_return (0, "not a memif interface");
 
-  memif_delete_if (vm, key);
+  mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
+  memif_delete_if (vm, mif);
 
   return 0;
 }
@@ -150,11 +157,59 @@ memif_delete_command_fn (vlib_main_t * vm, unformat_input_t * input,
 /* *INDENT-OFF* */
 VLIB_CLI_COMMAND (memif_delete_command, static) = {
   .path = "delete memif",
-  .short_help = "delete memif key <key-value>",
+  .short_help = "delete memif {<interface> | sw_if_index <sw_idx>}",
   .function = memif_delete_command_fn,
 };
 /* *INDENT-ON* */
 
+static u8 *
+format_memif_if_flags (u8 * s, va_list * args)
+{
+  u32 flags = va_arg (*args, u32);
+#define _(a,b,c) if ( flags & (1 << a)) s = format (s, " %s", c);
+  foreach_memif_if_flag
+#undef _
+    return s;
+}
+
+static u8 *
+format_memif_if_mode (u8 * s, va_list * args)
+{
+  memif_if_t *mif = va_arg (*args, memif_if_t *);
+  if (mif->mode == MEMIF_INTERFACE_MODE_ETHERNET)
+    return format (s, "ethernet");
+  if (mif->mode == MEMIF_INTERFACE_MODE_IP)
+    return format (s, "ip");
+  if (mif->mode == MEMIF_INTERFACE_MODE_PUNT_INJECT)
+    return format (s, "punt-inject");
+  return format (s, "unknown mode (%u)", mif->mode);;
+}
+
+static u8 *
+format_memif_queue (u8 * s, va_list * args)
+{
+  memif_if_t *mif = va_arg (*args, memif_if_t *);
+  memif_queue_t *mq = va_arg (*args, memif_queue_t *);
+  uword i = va_arg (*args, uword);
+  uword indent = format_get_indent (s);
+
+  s = format (s, "%U%s ring %u:\n",
+	      format_white_space, indent,
+	      (mif->flags & MEMIF_IF_FLAG_IS_SLAVE) ?
+	      "slave-to-master" : "master-to-slave", i);
+  s = format (s, "%Uregion %u offset %u ring-size %u int-fd %d\n",
+	      format_white_space, indent + 4,
+	      mq->region, mq->offset, (1 << mq->log2_ring_size), mq->int_fd);
+
+  if (mq->ring)
+    s = format (s, "%Uhead %u tail %u flags 0x%04x interrupts %u\n",
+		format_white_space, indent + 4,
+		mq->ring->head, mq->ring->tail, mq->ring->flags,
+		mq->int_count);
+
+  return s;
+}
+
 static clib_error_t *
 memif_show_command_fn (vlib_main_t * vm, unformat_input_t * input,
 		       vlib_cli_command_t * cmd)
@@ -162,39 +217,43 @@ memif_show_command_fn (vlib_main_t * vm, unformat_input_t * input,
   memif_main_t *mm = &memif_main;
   memif_if_t *mif;
   vnet_main_t *vnm = vnet_get_main ();
-  int i;
+  memif_queue_t *mq;
+  uword i;
 
   /* *INDENT-OFF* */
   pool_foreach (mif, mm->interfaces,
     ({
+       memif_socket_file_t * msf = vec_elt_at_index (mm->socket_files,
+						     mif->socket_file_index);
        vlib_cli_output (vm, "interface %U", format_vnet_sw_if_index_name,
 			vnm, mif->sw_if_index);
-       vlib_cli_output (vm, "  key 0x%" PRIx64 " file %s", mif->key,
-			mif->socket_filename);
-       vlib_cli_output (vm, "  listener %d conn-fd %d int-fd %d", mif->listener_index,
-			mif->connection.fd, mif->interrupt_line.fd);
-       vlib_cli_output (vm, "  ring-size %u num-s2m-rings %u num-m2s-rings %u buffer_size %u",
-			(1 << mif->log2_ring_size),
-			mif->num_s2m_rings,
-			mif->num_m2s_rings,
-			mif->buffer_size);
-       for (i=0; i < mif->num_s2m_rings; i++)
+       if (mif->remote_name)
+         vlib_cli_output (vm, "  remote-name \"%s\"", mif->remote_name);
+       if (mif->remote_if_name)
+         vlib_cli_output (vm, "  remote-interface \"%s\"", mif->remote_if_name);
+       vlib_cli_output (vm, "  id %d mode %U file %s", mif->id,
+			format_memif_if_mode, mif, msf->filename);
+       vlib_cli_output (vm, "  flags%U", format_memif_if_flags, mif->flags);
+       vlib_cli_output (vm, "  listener-fd %d conn-fd %d", msf->fd, mif->conn_fd);
+       vlib_cli_output (vm, "  num-s2m-rings %u num-m2s-rings %u buffer-size %u",
+			mif->run.num_s2m_rings,
+			mif->run.num_m2s_rings,
+			mif->run.buffer_size);
+
+       if (mif->local_disc_string)
+         vlib_cli_output (vm, "  local-disc-reason \"%s\"", mif->local_disc_string);
+       if (mif->remote_disc_string)
+         vlib_cli_output (vm, "  remote-disc-reason \"%s\"", mif->remote_disc_string);
+
+       vec_foreach_index (i, mif->tx_queues)
          {
-	   memif_ring_t * ring = memif_get_ring (mif, MEMIF_RING_S2M, i);
-	   if (ring)
-	     {
-	       vlib_cli_output (vm, "  slave-to-master ring %u:", i);
-	       vlib_cli_output (vm, "    head %u tail %u", ring->head, ring->tail);
-	     }
+	   mq = vec_elt_at_index (mif->tx_queues, i);
+	   vlib_cli_output (vm, "  %U", format_memif_queue, mif, mq, i);
 	 }
-       for (i=0; i < mif->num_m2s_rings; i++)
+       vec_foreach_index (i, mif->rx_queues)
          {
-	   memif_ring_t * ring = memif_get_ring (mif, MEMIF_RING_M2S, i);
-	   if (ring)
-	     {
-	       vlib_cli_output (vm, "  master-to-slave ring %u:", i);
-	       vlib_cli_output (vm, "    head %u tail %u", ring->head, ring->tail);
-	     }
+	   mq = vec_elt_at_index (mif->rx_queues, i);
+	   vlib_cli_output (vm, "  %U", format_memif_queue, mif, mq, i);
 	 }
     }));
   /* *INDENT-ON* */
diff --git a/src/plugins/memif/device.c b/src/plugins/memif/device.c
index f496b17d..870dd354 100644
--- a/src/plugins/memif/device.c
+++ b/src/plugins/memif/device.c
@@ -26,6 +26,7 @@
 #include <vnet/ethernet/ethernet.h>
 
 #include <memif/memif.h>
+#include <memif/private.h>
 
 #define foreach_memif_tx_func_error	       \
 _(NO_FREE_SLOTS, "no free tx slots")           \
@@ -45,8 +46,7 @@ static char *memif_tx_func_error_strings[] = {
 #undef _
 };
 
-
-static u8 *
+u8 *
 format_memif_device_name (u8 * s, va_list * args)
 {
   u32 i = va_arg (*args, u32);
@@ -91,27 +91,30 @@ memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 			   vlib_frame_t * frame, memif_if_t * mif,
 			   memif_ring_type_t type)
 {
-  u8 rid;
+  u8 qid;
   memif_ring_t *ring;
   u32 *buffers = vlib_frame_args (frame);
   u32 n_left = frame->n_vectors;
-  u16 ring_size = 1 << mif->log2_ring_size;
-  u16 mask = ring_size - 1;
+  u16 ring_size, mask;
   u16 head, tail;
   u16 free_slots;
   u32 thread_index = vlib_get_thread_index ();
-  u8 tx_queues = memif_get_tx_queues (mif);
+  u8 tx_queues = vec_len (mif->tx_queues);
+  memif_queue_t *mq;
 
   if (tx_queues < vec_len (vlib_mains))
     {
-      rid = thread_index % tx_queues;
+      qid = thread_index % tx_queues;
       clib_spinlock_lock_if_init (&mif->lockp);
     }
   else
     {
-      rid = thread_index;
+      qid = thread_index;
     }
-  ring = memif_get_ring (mif, type, rid);
+  mq = vec_elt_at_index (mif->tx_queues, qid);
+  ring = mq->ring;
+  ring_size = 1 << mq->log2_ring_size;
+  mask = ring_size - 1;
 
   /* free consumed buffers */
 
@@ -214,10 +217,11 @@ memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
     }
 
   vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
-  if (mif->interrupt_line.fd > 0)
+  if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0 && mq->int_fd > -1)
     {
-      u8 b = rid;
-      CLIB_UNUSED (int r) = write (mif->interrupt_line.fd, &b, sizeof (b));
+      u64 b = 1;
+      CLIB_UNUSED (int r) = write (mq->int_fd, &b, sizeof (b));
+      mq->int_count++;
     }
 
   return frame->n_vectors;
@@ -263,34 +267,34 @@ memif_clear_hw_interface_counters (u32 instance)
 }
 
 static clib_error_t *
+memif_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
+				vnet_hw_interface_rx_mode mode)
+{
+  memif_main_t *mm = &memif_main;
+  vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
+  memif_if_t *mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
+  memif_queue_t *mq = vec_elt_at_index (mif->rx_queues, qid);
+
+  if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
+    mq->ring->flags |= MEMIF_RING_FLAG_MASK_INT;
+  else
+    mq->ring->flags &= ~MEMIF_RING_FLAG_MASK_INT;
+
+  return 0;
+}
+
+static clib_error_t *
 memif_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
 {
-  memif_main_t *apm = &memif_main;
-  vlib_main_t *vm = vlib_get_main ();
-  memif_msg_t msg = { 0 };
+  memif_main_t *mm = &memif_main;
   vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
-  memif_if_t *mif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
+  memif_if_t *mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
   static clib_error_t *error = 0;
 
   if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
     mif->flags |= MEMIF_IF_FLAG_ADMIN_UP;
   else
-    {
-      mif->flags &= ~MEMIF_IF_FLAG_ADMIN_UP;
-      if (!(mif->flags & MEMIF_IF_FLAG_DELETING)
-	  && mif->connection.index != ~0)
-	{
-	  msg.version = MEMIF_VERSION;
-	  msg.type = MEMIF_MSG_TYPE_DISCONNECT;
-	  if (send (mif->connection.fd, &msg, sizeof (msg), 0) < 0)
-	    {
-	      clib_unix_warning ("Failed to send disconnect request");
-	      error = clib_error_return_unix (0, "send fd %d",
-					      mif->connection.fd);
-	      memif_disconnect (vm, mif);
-	    }
-	}
-    }
+    mif->flags &= ~MEMIF_IF_FLAG_ADMIN_UP;
 
   return error;
 }
@@ -317,6 +321,7 @@ VNET_DEVICE_CLASS (memif_device_class) = {
   .clear_counters = memif_clear_hw_interface_counters,
   .admin_up_down_function = memif_interface_admin_up_down,
   .subif_add_del_function = memif_subif_add_del_function,
+  .rx_mode_change_function = memif_interface_rx_mode_change,
 };
 
 VLIB_DEVICE_TX_FUNCTION_MULTIARCH(memif_device_class,
diff --git a/src/plugins/memif/memif.api b/src/plugins/memif/memif.api
index b0a351aa..c9632d10 100644
--- a/src/plugins/memif/memif.api
+++ b/src/plugins/memif/memif.api
@@ -17,9 +17,10 @@
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
     @param role - role of the interface in the connection (master/slave)
+    @param mode - interface mode
     @param rx_queues - number of rx queues (only valid for slave)
     #param tx_queues - number of tx queues (only valid for slave)
-    @param key - 64bit integer used to authenticate and match opposite sides
+    @param id - 32bit integer used to authenticate and match opposite sides
            of the connection
     @param socket_filename - filename of the socket to be used for connection
            establishment
@@ -33,12 +34,12 @@ define memif_create
   u32 context;
 
   u8 role; /* 0 = master, 1 = slave */
+  u8 mode; /* 0 = ethernet, 1 = ip, 2 = punt/inject */
   u8 rx_queues; /* optional, default is 1 */
   u8 tx_queues; /* optional, default is 1 */
-  u64 key; /* optional, default is 0 */
-  u8 socket_filename[128]; /* optional, default is "/var/vpp/memif.sock"
-                              and can be changed in VPP startup config */
-
+  u32 id; /* optional, default is 0 */
+  u8 socket_filename[128]; /* optional, default is "/var/vpp/memif.sock" */
+  u8 secret[24]; /* optional, default is "" */
   u32 ring_size; /* optional, default is 1024 entries, must be power of 2 */
   u16 buffer_size; /* optional, default is 2048 bytes */
   u8 hw_addr[6]; /* optional, randomly generated if not defined */
@@ -74,8 +75,9 @@ autoreply define memif_delete
     @param sw_if_index - index of the interface
     @param if_name - name of the interface
     @param hw_addr - interface MAC address
-    @param key - key associated with the interface
+    @param id - id associated with the interface
     @param role - role of the interface in the connection (master/slave)
+    @param mode - interface mode
     @param socket_filename - name of the socket used by this interface
            to establish new connections
     @param ring_size - the number of entries of RX/TX rings
@@ -93,8 +95,9 @@ define memif_details
   u8 hw_addr[6];
 
   /* memif specific parameters */
-  u64 key;
+  u32 id;
   u8 role; /* 0 = master, 1 = slave */
+  u8 mode; /* 0 = ethernet, 1 = ip, 2 = punt/inject */
   u8 socket_filename[128];
   u32 ring_size;
   u16 buffer_size; /* optional, default is 2048 bytes */
diff --git a/src/plugins/memif/memif.c b/src/plugins/memif/memif.c
index 7d2a09a2..f082b58c 100644
--- a/src/plugins/memif/memif.c
+++ b/src/plugins/memif/memif.c
@@ -1,6 +1,6 @@
 /*
  *------------------------------------------------------------------
- * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Copyright (c) 2017 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
@@ -15,6 +15,7 @@
  *------------------------------------------------------------------
  */
 
+
 #define _GNU_SOURCE
 #include <stdint.h>
 #include <net/if.h>
@@ -26,7 +27,9 @@
 #include <sys/uio.h>
 #include <sys/mman.h>
 #include <sys/prctl.h>
+#include <sys/eventfd.h>
 #include <inttypes.h>
+#include <limits.h>
 
 #include <vlib/vlib.h>
 #include <vlib/unix/unix.h>
@@ -34,21 +37,10 @@
 #include <vnet/ethernet/ethernet.h>
 #include <vpp/app/version.h>
 #include <memif/memif.h>
-
-#define MEMIF_DEBUG 1
-
-#if MEMIF_DEBUG == 1
-#define DEBUG_LOG(...) clib_warning(__VA_ARGS__)
-#define DEBUG_UNIX_LOG(...) clib_unix_warning(__VA_ARGS__)
-#else
-#define DEBUG_LOG(...)
-#endif
+#include <memif/private.h>
 
 memif_main_t memif_main;
 
-static clib_error_t *memif_conn_fd_read_ready (unix_file_t * uf);
-static clib_error_t *memif_int_fd_read_ready (unix_file_t * uf);
-
 static u32
 memif_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, u32 flags)
 {
@@ -57,604 +49,299 @@ memif_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, u32 flags)
 }
 
 static void
-memif_remove_pending_conn (memif_pending_conn_t * pending_conn)
-{
-  memif_main_t *mm = &memif_main;
-
-  unix_file_del (&unix_main,
-		 unix_main.file_pool + pending_conn->connection.index);
-  pool_put (mm->pending_conns, pending_conn);
-}
-
-static void
-memif_connect (vlib_main_t * vm, memif_if_t * mif)
+memif_queue_intfd_close (memif_queue_t * mq)
 {
-  vnet_main_t *vnm = vnet_get_main ();
-  int num_rings = mif->num_s2m_rings + mif->num_m2s_rings;
-  memif_ring_data_t *rd = NULL;
-  vnet_hw_interface_t *hw;
-  u8 rid, rx_queues;
-  int ret;
-
-  vec_validate_aligned (mif->ring_data, num_rings - 1, CLIB_CACHE_LINE_BYTES);
-  vec_foreach (rd, mif->ring_data)
-  {
-    rd->last_head = 0;
-  }
-
-  mif->flags &= ~MEMIF_IF_FLAG_CONNECTING;
-  mif->flags |= MEMIF_IF_FLAG_CONNECTED;
-  vnet_hw_interface_set_flags (vnm, mif->hw_if_index,
-			       VNET_HW_INTERFACE_FLAG_LINK_UP);
-
-  hw = vnet_get_hw_interface (vnm, mif->hw_if_index);
-  hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
-  vnet_hw_interface_set_input_node (vnm, mif->hw_if_index,
-				    memif_input_node.index);
-  rx_queues = memif_get_rx_queues (mif);
-  for (rid = 0; rid < rx_queues; rid++)
+  if (mq->int_unix_file_index != ~0)
     {
-      vnet_hw_interface_assign_rx_thread (vnm, mif->hw_if_index, rid, ~0);
-      ret = vnet_hw_interface_set_rx_mode (vnm, mif->hw_if_index, rid,
-					   VNET_HW_INTERFACE_RX_MODE_INTERRUPT);
-      if (ret)
-	DEBUG_LOG ("Warning: unable to set rx mode for interface %d "
-		   "queue %d: rc=%d", mif->hw_if_index, rid, ret);
+      memif_file_del_by_index (mq->int_unix_file_index);
+      mq->int_unix_file_index = ~0;
+      mq->int_fd = -1;
     }
-}
-
-static void
-memif_disconnect_do (vlib_main_t * vm, memif_if_t * mif)
-{
-  vnet_main_t *vnm = vnet_get_main ();
-  u8 rid, rx_queues;
-  int rv;
-  memif_shm_t **shm;
-
-  mif->flags &= ~(MEMIF_IF_FLAG_CONNECTED | MEMIF_IF_FLAG_CONNECTING);
-  if (mif->hw_if_index != ~0)
-    vnet_hw_interface_set_flags (vnm, mif->hw_if_index, 0);
-
-  if (mif->connection.index != ~0)
+  else if (mq->int_fd > -1)
     {
-      unix_file_del (&unix_main, unix_main.file_pool + mif->connection.index);
-      mif->connection.index = ~0;
-      mif->connection.fd = -1;	/* closed in unix_file_del */
+      close (mq->int_fd);
+      mq->int_fd = -1;
     }
-
-  rx_queues = memif_get_rx_queues (mif);
-  for (rid = 0; rid < rx_queues; rid++)
-    {
-      rv = vnet_hw_interface_unassign_rx_thread (vnm, mif->hw_if_index, rid);
-      if (rv)
-	DEBUG_LOG ("Warning: unable to unassign interface %d, "
-		   "queue %d: rc=%d", mif->hw_if_index, rid, rv);
-    }
-
-  shm = (memif_shm_t **) mif->regions;
-  rv = munmap ((void *) *shm, mif->shared_mem_size);
-  if (rv)
-    DEBUG_UNIX_LOG ("Error: failed munmap call");
-
-  vec_free (mif->regions);
 }
 
 void
-memif_disconnect (vlib_main_t * vm, memif_if_t * mif)
-{
-  if (mif->interrupt_line.index != ~0)
-    {
-      unix_file_del (&unix_main,
-		     unix_main.file_pool + mif->interrupt_line.index);
-      mif->interrupt_line.index = ~0;
-      mif->interrupt_line.fd = -1;	/* closed in unix_file_del */
-    }
-
-  memif_disconnect_do (vm, mif);
-}
-
-static clib_error_t *
-memif_process_connect_req (memif_pending_conn_t * pending_conn,
-			   memif_msg_t * req, struct ucred *slave_cr,
-			   int shm_fd, int int_fd)
+memif_disconnect (memif_if_t * mif, clib_error_t * err)
 {
-  memif_main_t *mm = &memif_main;
-  vlib_main_t *vm = vlib_get_main ();
-  int fd = pending_conn->connection.fd;
-  unix_file_t *uf = 0;
-  memif_if_t *mif = 0;
-  memif_msg_t resp = { 0 };
-  unix_file_t template = { 0 };
-  void *shm;
-  uword *p;
-  u8 retval = 0;
-  static clib_error_t *error = 0;
-
-  if (shm_fd == -1)
-    {
-      DEBUG_LOG
-	("Connection request is missing shared memory file descriptor");
-      retval = 1;
-      goto response;
-    }
-
-  if (int_fd == -1)
-    {
-      DEBUG_LOG
-	("Connection request is missing interrupt line file descriptor");
-      retval = 2;
-      goto response;
-    }
+  vnet_main_t *vnm = vnet_get_main ();
+  memif_region_t *mr;
+  memif_queue_t *mq;
+  int i;
 
-  if (slave_cr == NULL)
-    {
-      DEBUG_LOG ("Connection request is missing slave credentials");
-      retval = 3;
-      goto response;
-    }
+  if (mif == 0)
+    return;
 
-  p = mhash_get (&mm->if_index_by_key, &req->key);
-  if (!p)
-    {
-      DEBUG_LOG
-	("Connection request with unmatched key (0x%" PRIx64 ")", req->key);
-      retval = 4;
-      goto response;
-    }
+  DBG ("disconnect %u (%v)", mif->dev_instance, err ? err->what : 0);
 
-  mif = vec_elt_at_index (mm->interfaces, *p);
-  if (mif->listener_index != pending_conn->listener_index)
+  if (err)
     {
-      DEBUG_LOG
-	("Connection request with non-matching listener (%d vs. %d)",
-	 pending_conn->listener_index, mif->listener_index);
-      retval = 5;
-      goto response;
+      clib_error_t *e = 0;
+      mif->local_disc_string = vec_dup (err->what);
+      if (mif->conn_fd > -1)
+	e = memif_msg_send_disconnect (mif, err);
+      clib_error_free (e);
     }
 
-  if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
-    {
-      DEBUG_LOG ("Memif slave does not accept connection requests");
-      retval = 6;
-      goto response;
-    }
+  /* set interface down */
+  mif->flags &= ~(MEMIF_IF_FLAG_CONNECTED | MEMIF_IF_FLAG_CONNECTING);
+  if (mif->hw_if_index != ~0)
+    vnet_hw_interface_set_flags (vnm, mif->hw_if_index, 0);
 
-  if (mif->connection.fd != -1)
+  /* close connection socket */
+  if (mif->conn_unix_file_index != ~0)
     {
-      DEBUG_LOG
-	("Memif with key 0x%" PRIx64 " is already connected", mif->key);
-      retval = 7;
-      goto response;
+      memif_file_del_by_index (mif->conn_unix_file_index);
+      mif->conn_unix_file_index = ~0;
     }
+  else if (mif->conn_fd > -1)
+    close (mif->conn_fd);
+  mif->conn_fd = -1;
 
-  if ((mif->flags & MEMIF_IF_FLAG_ADMIN_UP) == 0)
-    {
-      /* just silently decline the request */
-      retval = 8;
-      goto response;
-    }
+  vec_foreach_index (i, mif->rx_queues)
+  {
+    mq = vec_elt_at_index (mif->rx_queues, i);
+    if (mq->ring)
+      {
+	int rv;
+	rv = vnet_hw_interface_unassign_rx_thread (vnm, mif->hw_if_index, i);
+	if (rv)
+	  DBG ("Warning: unable to unassign interface %d, "
+	       "queue %d: rc=%d", mif->hw_if_index, i, rv);
+	mq->ring = 0;
+      }
+  }
 
-  if (req->shared_mem_size < sizeof (memif_shm_t))
-    {
-      DEBUG_LOG
-	("Unexpectedly small shared memory segment received from slave.");
-      retval = 9;
-      goto response;
-    }
+  /* free tx and rx queues */
+  vec_foreach (mq, mif->rx_queues) memif_queue_intfd_close (mq);
+  vec_free (mif->rx_queues);
 
-  if ((shm =
-       mmap (NULL, req->shared_mem_size, PROT_READ | PROT_WRITE, MAP_SHARED,
-	     shm_fd, 0)) == MAP_FAILED)
-    {
-      DEBUG_UNIX_LOG
-	("Failed to map shared memory segment received from slave memif");
-      error = clib_error_return_unix (0, "mmap fd %d", shm_fd);
-      retval = 10;
-      goto response;
-    }
+  vec_foreach (mq, mif->tx_queues) memif_queue_intfd_close (mq);
+  vec_free (mif->tx_queues);
 
-  if (((memif_shm_t *) shm)->cookie != 0xdeadbeef)
-    {
-      DEBUG_LOG
-	("Possibly corrupted shared memory segment received from slave memif");
-      munmap (shm, req->shared_mem_size);
-      retval = 11;
-      goto response;
-    }
+  /* free memory regions */
+  vec_foreach (mr, mif->regions)
+  {
+    int rv;
+    if ((rv = munmap (mr->shm, mr->region_size)))
+      clib_warning ("munmap failed, rv = %d", rv);
+    if (mr->fd > -1)
+      close (mr->fd);
+  }
+  vec_free (mif->regions);
 
-  mif->shared_mem_size = req->shared_mem_size;
-  mif->log2_ring_size = req->log2_ring_size;
-  mif->num_s2m_rings = req->num_s2m_rings;
-  mif->num_m2s_rings = req->num_m2s_rings;
-  mif->buffer_size = req->buffer_size;
-  mif->remote_pid = slave_cr->pid;
-  mif->remote_uid = slave_cr->uid;
-  vec_add1 (mif->regions, shm);
-
-  /* register interrupt line */
-  mif->interrupt_line.fd = int_fd;
-  template.read_function = memif_int_fd_read_ready;
-  template.file_descriptor = int_fd;
-  template.private_data = mif->if_index;
-  mif->interrupt_line.index = unix_file_add (&unix_main, &template);
-
-  /* change context for future messages */
-  uf = vec_elt_at_index (unix_main.file_pool, pending_conn->connection.index);
-  uf->private_data = mif->if_index << 1;
-  mif->connection = pending_conn->connection;
-  pool_put (mm->pending_conns, pending_conn);
-  pending_conn = 0;
-
-  memif_connect (vm, mif);
-
-response:
-  resp.version = MEMIF_VERSION;
-  resp.type = MEMIF_MSG_TYPE_CONNECT_RESP;
-  resp.retval = retval;
-  if (send (fd, &resp, sizeof (resp), 0) < 0)
-    {
-      DEBUG_UNIX_LOG ("Failed to send connection response");
-      error = clib_error_return_unix (0, "send fd %d", fd);
-      if (pending_conn)
-	memif_remove_pending_conn (pending_conn);
-      else
-	memif_disconnect (vm, mif);
-    }
-  if (retval > 0)
-    {
-      if (shm_fd >= 0)
-	close (shm_fd);
-      if (int_fd >= 0)
-	close (int_fd);
-    }
-  return error;
+  mif->remote_pid = 0;
+  vec_free (mif->remote_name);
+  vec_free (mif->remote_if_name);
+  clib_fifo_free (mif->msg_queue);
 }
 
 static clib_error_t *
-memif_process_connect_resp (memif_if_t * mif, memif_msg_t * resp)
+memif_int_fd_read_ready (unix_file_t * uf)
 {
-  vlib_main_t *vm = vlib_get_main ();
-
-  if ((mif->flags & MEMIF_IF_FLAG_IS_SLAVE) == 0)
-    {
-      DEBUG_LOG ("Memif master does not accept connection responses");
-      return 0;
-    }
+  memif_main_t *mm = &memif_main;
+  vnet_main_t *vnm = vnet_get_main ();
+  u16 qid = uf->private_data & 0xFFFF;
+  memif_if_t *mif = vec_elt_at_index (mm->interfaces, uf->private_data >> 16);
+  memif_queue_t *mq = vec_elt_at_index (mif->rx_queues, qid);
+  u64 b;
+  ssize_t size;
 
-  if ((mif->flags & MEMIF_IF_FLAG_CONNECTING) == 0)
+  size = read (uf->file_descriptor, &b, sizeof (b));
+  if (size < 0)
     {
-      DEBUG_LOG ("Unexpected connection response");
+      DBG_UNIX_LOG ("Failed to read from socket");
       return 0;
     }
 
-  if (resp->retval == 0)
-    memif_connect (vm, mif);
-  else
-    memif_disconnect (vm, mif);
+  vnet_device_input_set_interrupt_pending (vnm, mif->hw_if_index, qid);
+  mq->int_count++;
 
   return 0;
 }
 
-static clib_error_t *
-memif_conn_fd_read_ready (unix_file_t * uf)
-{
-  memif_main_t *mm = &memif_main;
-  vlib_main_t *vm = vlib_get_main ();
-  memif_if_t *mif = 0;
-  memif_pending_conn_t *pending_conn = 0;
-  int fd_array[2] = { -1, -1 };
-  char ctl[CMSG_SPACE (sizeof (fd_array)) +
-	   CMSG_SPACE (sizeof (struct ucred))] = { 0 };
-  struct msghdr mh = { 0 };
-  struct iovec iov[1];
-  struct ucred *cr = 0;
-  memif_msg_t msg = { 0 };
-  struct cmsghdr *cmsg;
-  ssize_t size;
-  static clib_error_t *error = 0;
-
-  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);
-
-  /* grab the appropriate context */
-  if (uf->private_data & 1)
-    pending_conn = vec_elt_at_index (mm->pending_conns,
-				     uf->private_data >> 1);
-  else
-    mif = vec_elt_at_index (mm->interfaces, uf->private_data >> 1);
-
-  /* Stop workers to avoid end of the world */
-  vlib_worker_thread_barrier_sync (vlib_get_main ());
 
-  /* receive the incoming message */
-  size = recvmsg (uf->file_descriptor, &mh, 0);
-  if (size != sizeof (memif_msg_t))
-    {
-      if (size == 0)
-	{
-	  if (pending_conn)
-	    memif_remove_pending_conn (pending_conn);
-	  else
-	    memif_disconnect_do (vm, mif);
-	  goto return_ok;
-	}
+clib_error_t *
+memif_connect (memif_if_t * mif)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  unix_file_t template = { 0 };
+  memif_region_t *mr;
+  int i;
 
-      DEBUG_UNIX_LOG ("Malformed message received on fd %d",
-		      uf->file_descriptor);
-      error = clib_error_return_unix (0, "recvmsg fd %d",
-				      uf->file_descriptor);
-      goto disconnect;
-    }
+  DBG ("connect %u", mif->dev_instance);
 
-  /* check version of the sender's memif plugin */
-  if (msg.version != MEMIF_VERSION)
-    {
-      DEBUG_LOG ("Memif version mismatch");
-      goto disconnect;
-    }
+  vec_free (mif->local_disc_string);
+  vec_free (mif->remote_disc_string);
 
-  /* process the message based on its type */
-  switch (msg.type)
-    {
-    case MEMIF_MSG_TYPE_CONNECT_REQ:
-      if (pending_conn == 0)
-	DEBUG_LOG ("Received unexpected connection request");
-      else
-	{
-	  /* Read anciliary data */
-	  cmsg = CMSG_FIRSTHDR (&mh);
-	  while (cmsg)
-	    {
-	      if (cmsg->cmsg_level == SOL_SOCKET
-		  && cmsg->cmsg_type == SCM_CREDENTIALS)
-		{
-		  cr = (struct ucred *) CMSG_DATA (cmsg);
-		}
-	      else if (cmsg->cmsg_level == SOL_SOCKET
-		       && cmsg->cmsg_type == SCM_RIGHTS)
-		{
-		  memcpy (fd_array, CMSG_DATA (cmsg), sizeof (fd_array));
-		}
-	      cmsg = CMSG_NXTHDR (&mh, cmsg);
-	    }
-	  error = memif_process_connect_req (pending_conn, &msg, cr,
-					     fd_array[0], fd_array[1]);
-	}
-      break;
+  vec_foreach (mr, mif->regions)
+  {
+    if (mr->shm)
+      continue;
 
-    case MEMIF_MSG_TYPE_CONNECT_RESP:
-      if (mif == 0)
-	DEBUG_LOG ("Received unexpected connection response");
-      else
-	error = memif_process_connect_resp (mif, &msg);
-      break;
+    if (mr->fd < 0)
+      clib_error_return (0, "no memory region fd");
 
-    case MEMIF_MSG_TYPE_DISCONNECT:
-      goto disconnect;
+    if ((mr->shm = mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
+			 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
+      return clib_error_return_unix (0, "mmap");
+  }
 
-    default:
-      DEBUG_LOG ("Received unknown message type");
-      goto disconnect;
-    }
+  template.read_function = memif_int_fd_read_ready;
 
-return_ok:
-  vlib_worker_thread_barrier_release (vlib_get_main ());
-  return error;
+  vec_foreach_index (i, mif->tx_queues)
+  {
+    memif_queue_t *mq = vec_elt_at_index (mif->tx_queues, i);
 
-disconnect:
-  if (pending_conn)
-    memif_remove_pending_conn (pending_conn);
-  else
-    memif_disconnect (vm, mif);
-  vlib_worker_thread_barrier_release (vlib_get_main ());
-  return error;
-}
+    mq->ring = mif->regions[mq->region].shm + mq->offset;
+    if (mq->ring->cookie != MEMIF_COOKIE)
+      return clib_error_return (0, "wrong cookie on tx ring %u", i);
+  }
 
-static clib_error_t *
-memif_int_fd_read_ready (unix_file_t * uf)
-{
-  memif_main_t *mm = &memif_main;
-  vnet_main_t *vnm = vnet_get_main ();
-  memif_if_t *mif = vec_elt_at_index (mm->interfaces, uf->private_data);
-  u8 b;
-  ssize_t size;
+  vec_foreach_index (i, mif->rx_queues)
+  {
+    memif_queue_t *mq = vec_elt_at_index (mif->rx_queues, i);
+    int rv;
+
+    mq->ring = mif->regions[mq->region].shm + mq->offset;
+    if (mq->ring->cookie != MEMIF_COOKIE)
+      return clib_error_return (0, "wrong cookie on tx ring %u", i);
+
+    if (mq->int_fd > -1)
+      {
+	template.file_descriptor = mq->int_fd;
+	template.private_data = (mif->dev_instance << 16) | (i & 0xFFFF);
+	memif_file_add (&mq->int_unix_file_index, &template);
+      }
+    vnet_hw_interface_assign_rx_thread (vnm, mif->hw_if_index, i, ~0);
+    rv = vnet_hw_interface_set_rx_mode (vnm, mif->hw_if_index, i,
+					VNET_HW_INTERFACE_RX_MODE_INTERRUPT);
+    if (rv)
+      clib_warning
+	("Warning: unable to set rx mode for interface %d queue %d: "
+	 "rc=%d", mif->hw_if_index, i, rv);
+  }
 
-  size = read (uf->file_descriptor, &b, sizeof (b));
-  if (0 == size)
-    {
-      /* interrupt line was disconnected */
-      unix_file_del (&unix_main,
-		     unix_main.file_pool + mif->interrupt_line.index);
-      mif->interrupt_line.index = ~0;
-      mif->interrupt_line.fd = -1;
-    }
-  else if (size < 0)
-    DEBUG_UNIX_LOG ("Failed to read from socket");
-  else
-    vnet_device_input_set_interrupt_pending (vnm, mif->hw_if_index, b);
+  mif->flags &= ~MEMIF_IF_FLAG_CONNECTING;
+  mif->flags |= MEMIF_IF_FLAG_CONNECTED;
 
+  vnet_hw_interface_set_flags (vnm, mif->hw_if_index,
+			       VNET_HW_INTERFACE_FLAG_LINK_UP);
   return 0;
 }
 
-static clib_error_t *
-memif_conn_fd_accept_ready (unix_file_t * uf)
+static_always_inline memif_ring_t *
+memif_get_ring (memif_if_t * mif, memif_ring_type_t type, u16 ring_num)
 {
-  memif_main_t *mm = &memif_main;
-  memif_listener_t *listener = 0;
-  memif_pending_conn_t *pending_conn = 0;
-  int addr_len;
-  struct sockaddr_un client;
-  int conn_fd;
-  unix_file_t template = { 0 };
-
-  listener = pool_elt_at_index (mm->listeners, uf->private_data);
-
-  addr_len = sizeof (client);
-  conn_fd = accept (uf->file_descriptor,
-		    (struct sockaddr *) &client, (socklen_t *) & addr_len);
-
-  if (conn_fd < 0)
-    return clib_error_return_unix (0, "accept fd %d", uf->file_descriptor);
-
-  pool_get (mm->pending_conns, pending_conn);
-  pending_conn->index = pending_conn - mm->pending_conns;
-  pending_conn->listener_index = listener->index;
-  pending_conn->connection.fd = conn_fd;
-
-  template.read_function = memif_conn_fd_read_ready;
-  template.file_descriptor = conn_fd;
-  template.private_data = (pending_conn->index << 1) | 1;
-  pending_conn->connection.index = unix_file_add (&unix_main, &template);
-
-  return 0;
+  if (vec_len (mif->regions) == 0)
+    return NULL;
+  void *p = mif->regions[0].shm;
+  int ring_size =
+    sizeof (memif_ring_t) +
+    sizeof (memif_desc_t) * (1 << mif->run.log2_ring_size);
+  p += (ring_num + type * mif->run.num_s2m_rings) * ring_size;
+
+  return (memif_ring_t *) p;
 }
 
-static void
-memif_connect_master (vlib_main_t * vm, memif_if_t * mif)
+clib_error_t *
+memif_init_regions_and_queues (memif_if_t * mif)
 {
-  memif_msg_t msg;
-  struct msghdr mh = { 0 };
-  struct iovec iov[1];
-  struct cmsghdr *cmsg;
-  int mfd = -1;
-  int rv;
-  int fd_array[2] = { -1, -1 };
-  char ctl[CMSG_SPACE (sizeof (fd_array))];
   memif_ring_t *ring = NULL;
   int i, j;
-  void *shm = 0;
   u64 buffer_offset;
-  unix_file_t template = { 0 };
+  memif_region_t *r;
 
-  msg.version = MEMIF_VERSION;
-  msg.type = MEMIF_MSG_TYPE_CONNECT_REQ;
-  msg.key = mif->key;
-  msg.log2_ring_size = mif->log2_ring_size;
-  msg.num_s2m_rings = mif->num_s2m_rings;
-  msg.num_m2s_rings = mif->num_m2s_rings;
-  msg.buffer_size = mif->buffer_size;
+  vec_validate_aligned (mif->regions, 0, CLIB_CACHE_LINE_BYTES);
+  r = vec_elt_at_index (mif->regions, 0);
 
-  buffer_offset = sizeof (memif_shm_t) +
-    (mif->num_s2m_rings + mif->num_m2s_rings) *
+  buffer_offset = (mif->run.num_s2m_rings + mif->run.num_m2s_rings) *
     (sizeof (memif_ring_t) +
-     sizeof (memif_desc_t) * (1 << mif->log2_ring_size));
+     sizeof (memif_desc_t) * (1 << mif->run.log2_ring_size));
 
-  msg.shared_mem_size = buffer_offset +
-    mif->buffer_size * (1 << mif->log2_ring_size) * (mif->num_s2m_rings +
-						     mif->num_m2s_rings);
-
-  if ((mfd = memfd_create ("shared mem", MFD_ALLOW_SEALING)) == -1)
-    {
-      DEBUG_LOG ("Failed to create anonymous file");
-      goto error;
-    }
+  r->region_size = buffer_offset +
+    mif->run.buffer_size * (1 << mif->run.log2_ring_size) *
+    (mif->run.num_s2m_rings + mif->run.num_m2s_rings);
 
-  if ((fcntl (mfd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
-    {
-      DEBUG_UNIX_LOG ("Failed to seal an anonymous file off from truncating");
-      goto error;
-    }
+  if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
+    return clib_error_return_unix (0, "memfd_create");
 
-  if ((ftruncate (mfd, msg.shared_mem_size)) == -1)
-    {
-      DEBUG_UNIX_LOG ("Failed to extend the size of an anonymous file");
-      goto error;
-    }
+  if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
+    return clib_error_return_unix (0, "fcntl (F_ADD_SEALS, F_SEAL_SHRINK)");
 
-  if ((shm = mmap (NULL, msg.shared_mem_size, PROT_READ | PROT_WRITE,
-		   MAP_SHARED, mfd, 0)) == MAP_FAILED)
-    {
-      DEBUG_UNIX_LOG ("Failed to map anonymous file into memory");
-      goto error;
-    }
+  if ((ftruncate (r->fd, r->region_size)) == -1)
+    return clib_error_return_unix (0, "ftruncate");
 
-  mif->shared_mem_size = msg.shared_mem_size;
-  vec_add1 (mif->regions, shm);
-  ((memif_shm_t *) mif->regions[0])->cookie = 0xdeadbeef;
+  if ((r->shm = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
+		      MAP_SHARED, r->fd, 0)) == MAP_FAILED)
+    return clib_error_return_unix (0, "mmap");
 
-  for (i = 0; i < mif->num_s2m_rings; i++)
+  for (i = 0; i < mif->run.num_s2m_rings; i++)
     {
       ring = memif_get_ring (mif, MEMIF_RING_S2M, i);
       ring->head = ring->tail = 0;
-      for (j = 0; j < (1 << mif->log2_ring_size); j++)
+      ring->cookie = MEMIF_COOKIE;
+      for (j = 0; j < (1 << mif->run.log2_ring_size); j++)
 	{
-	  u16 slot = i * (1 << mif->log2_ring_size) + j;
+	  u16 slot = i * (1 << mif->run.log2_ring_size) + j;
 	  ring->desc[j].region = 0;
 	  ring->desc[j].offset =
-	    buffer_offset + (u32) (slot * mif->buffer_size);
-	  ring->desc[j].buffer_length = mif->buffer_size;
+	    buffer_offset + (u32) (slot * mif->run.buffer_size);
+	  ring->desc[j].buffer_length = mif->run.buffer_size;
 	}
     }
-  for (i = 0; i < mif->num_m2s_rings; i++)
+  for (i = 0; i < mif->run.num_m2s_rings; i++)
     {
       ring = memif_get_ring (mif, MEMIF_RING_M2S, i);
       ring->head = ring->tail = 0;
-      for (j = 0; j < (1 << mif->log2_ring_size); j++)
+      ring->cookie = MEMIF_COOKIE;
+      for (j = 0; j < (1 << mif->run.log2_ring_size); j++)
 	{
 	  u16 slot =
-	    (i + mif->num_s2m_rings) * (1 << mif->log2_ring_size) + j;
+	    (i + mif->run.num_s2m_rings) * (1 << mif->run.log2_ring_size) + j;
 	  ring->desc[j].region = 0;
 	  ring->desc[j].offset =
-	    buffer_offset + (u32) (slot * mif->buffer_size);
-	  ring->desc[j].buffer_length = mif->buffer_size;
+	    buffer_offset + (u32) (slot * mif->run.buffer_size);
+	  ring->desc[j].buffer_length = mif->run.buffer_size;
 	}
     }
 
-  iov[0].iov_base = (void *) &msg;
-  iov[0].iov_len = sizeof (memif_msg_t);
-  mh.msg_iov = iov;
-  mh.msg_iovlen = 1;
-
-  /* create interrupt socket */
-  if (socketpair (AF_UNIX, SOCK_STREAM, 0, fd_array) < 0)
-    {
-      DEBUG_UNIX_LOG ("Failed to create a pair of connected sockets");
-      goto error;
-    }
-
-  mif->interrupt_line.fd = fd_array[0];
-  template.read_function = memif_int_fd_read_ready;
-  template.file_descriptor = mif->interrupt_line.fd;
-  template.private_data = mif->if_index;
-  mif->interrupt_line.index = unix_file_add (&unix_main, &template);
-
-  memset (&ctl, 0, sizeof (ctl));
-  mh.msg_control = ctl;
-  mh.msg_controllen = sizeof (ctl);
-  cmsg = CMSG_FIRSTHDR (&mh);
-  cmsg->cmsg_len = CMSG_LEN (sizeof (fd_array));
-  cmsg->cmsg_level = SOL_SOCKET;
-  cmsg->cmsg_type = SCM_RIGHTS;
-  fd_array[0] = mfd;
-  memcpy (CMSG_DATA (cmsg), fd_array, sizeof (fd_array));
-
-  mif->flags |= MEMIF_IF_FLAG_CONNECTING;
-  rv = sendmsg (mif->connection.fd, &mh, 0);
-  if (rv < 0)
-    {
-      DEBUG_UNIX_LOG ("Failed to send memif connection request");
-      goto error;
-    }
+  ASSERT (mif->tx_queues == 0);
+  vec_validate_aligned (mif->tx_queues, mif->run.num_s2m_rings - 1,
+			CLIB_CACHE_LINE_BYTES);
+  vec_foreach_index (i, mif->tx_queues)
+  {
+    memif_queue_t *mq = vec_elt_at_index (mif->tx_queues, i);
+    if ((mq->int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
+      return clib_error_return_unix (0, "eventfd[tx queue %u]", i);
+    mq->int_unix_file_index = ~0;
+    mq->ring = memif_get_ring (mif, MEMIF_RING_S2M, i);
+    mq->log2_ring_size = mif->cfg.log2_ring_size;
+    mq->region = 0;
+    mq->offset = (void *) mq->ring - (void *) mif->regions[mq->region].shm;
+    mq->last_head = 0;
+  }
 
-  /* No need to keep the descriptor open,
-   * mmap creates an extra reference to the underlying file */
-  close (mfd);
-  mfd = -1;
-  /* This FD is given to peer, so we can close it */
-  close (fd_array[1]);
-  fd_array[1] = -1;
-  return;
+  ASSERT (mif->rx_queues == 0);
+  vec_validate_aligned (mif->rx_queues, mif->run.num_m2s_rings - 1,
+			CLIB_CACHE_LINE_BYTES);
+  vec_foreach_index (i, mif->rx_queues)
+  {
+    memif_queue_t *mq = vec_elt_at_index (mif->rx_queues, i);
+    if ((mq->int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
+      return clib_error_return_unix (0, "eventfd[rx queue %u]", i);
+    mq->int_unix_file_index = ~0;
+    mq->ring = memif_get_ring (mif, MEMIF_RING_M2S, i);
+    mq->log2_ring_size = mif->cfg.log2_ring_size;
+    mq->region = 0;
+    mq->offset = (void *) mq->ring - (void *) mif->regions[mq->region].shm;
+    mq->last_head = 0;
+  }
 
-error:
-  if (mfd > -1)
-    close (mfd);
-  if (fd_array[1] > -1)
-    close (fd_array[1]);
-  memif_disconnect (vm, mif);
+  return 0;
 }
 
 static uword
@@ -665,24 +352,22 @@ memif_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
   struct sockaddr_un sun;
   int sockfd;
   uword *event_data = 0, event_type;
-  unix_file_t template = { 0 };
   u8 enabled = 0;
   f64 start_time, last_run_duration = 0, now;
 
-  sockfd = socket (AF_UNIX, SOCK_STREAM, 0);
+  sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
   if (sockfd < 0)
     {
-      DEBUG_UNIX_LOG ("socket AF_UNIX");
+      DBG_UNIX_LOG ("socket AF_UNIX");
       return 0;
     }
   sun.sun_family = AF_UNIX;
-  template.read_function = memif_conn_fd_read_ready;
 
   while (1)
     {
       if (enabled)
-	vlib_process_wait_for_event_or_clock (vm,
-					      (f64) 3 - last_run_duration);
+	vlib_process_wait_for_event_or_clock (vm, (f64) 3 -
+					      last_run_duration);
       else
 	vlib_process_wait_for_event (vm);
 
@@ -707,6 +392,7 @@ memif_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
       /* *INDENT-OFF* */
       pool_foreach (mif, mm->interfaces,
         ({
+	  memif_socket_file_t * msf = vec_elt_at_index (mm->socket_files, mif->socket_file_index);
 	  /* Allow no more than 10us without a pause */
 	  now = vlib_time_now (vm);
 	  if (now > start_time + 10e-6)
@@ -726,24 +412,31 @@ memif_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
 
 	  if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
 	    {
-	      strncpy (sun.sun_path, (char *) mif->socket_filename,
+	      strncpy (sun.sun_path, (char *) msf->filename,
 		       sizeof (sun.sun_path) - 1);
 
 	      if (connect
 		  (sockfd, (struct sockaddr *) &sun,
 		   sizeof (struct sockaddr_un)) == 0)
 	        {
-		  mif->connection.fd = sockfd;
-		  template.file_descriptor = sockfd;
-		  template.private_data = mif->if_index << 1;
-		  mif->connection.index = unix_file_add (&unix_main, &template);
-		  memif_connect_master (vm, mif);
+		  unix_file_t t = { 0 };
+
+		  mif->conn_fd = sockfd;
+		  t.read_function = memif_slave_conn_fd_read_ready;
+		  t.write_function = memif_slave_conn_fd_write_ready;
+		  t.error_function = memif_slave_conn_fd_error;
+		  t.file_descriptor = mif->conn_fd;
+		  t.private_data = mif->dev_instance;
+		  memif_file_add (&mif->conn_unix_file_index, &t);
+		  hash_set (msf->dev_instance_by_fd, mif->conn_fd, mif->dev_instance);
+
+		  mif->flags |= MEMIF_IF_FLAG_CONNECTING;
 
 		  /* grab another fd */
-		  sockfd = socket (AF_UNIX, SOCK_STREAM, 0);
+		  sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
 		  if (sockfd < 0)
 		    {
-		      DEBUG_UNIX_LOG ("socket AF_UNIX");
+		      DBG_UNIX_LOG ("socket AF_UNIX");
 		      return 0;
 		    }
 	        }
@@ -763,75 +456,62 @@ VLIB_REGISTER_NODE (memif_process_node,static) = {
 };
 /* *INDENT-ON* */
 
-static void
-memif_close_if (memif_main_t * mm, memif_if_t * mif)
+int
+memif_delete_if (vlib_main_t * vm, memif_if_t * mif)
 {
-  vlib_main_t *vm = vlib_get_main ();
-  memif_listener_t *listener = 0;
-  memif_pending_conn_t *pending_conn = 0;
+  vnet_main_t *vnm = vnet_get_main ();
+  memif_main_t *mm = &memif_main;
+  memif_socket_file_t *msf =
+    vec_elt_at_index (mm->socket_files, mif->socket_file_index);
+  clib_error_t *err;
+
+  mif->flags |= MEMIF_IF_FLAG_DELETING;
+  vec_free (mif->local_disc_string);
+  vec_free (mif->remote_disc_string);
+
+  /* bring down the interface */
+  vnet_hw_interface_set_flags (vnm, mif->hw_if_index, 0);
+  vnet_sw_interface_set_flags (vnm, mif->sw_if_index, 0);
+
+  err = clib_error_return (0, "interface deleted");
+  memif_disconnect (mif, err);
+  clib_error_free (err);
 
-  memif_disconnect (vm, mif);
+  /* remove the interface */
+  ethernet_delete_interface (vnm, mif->hw_if_index);
+  mif->hw_if_index = ~0;
+
+  /* free interface data structures */
+  clib_spinlock_free (&mif->lockp);
+  mhash_unset (&msf->dev_instance_by_id, &mif->id, 0);
 
-  if (mif->listener_index != (uword) ~ 0)
+  /* remove socket file */
+  if (--(msf->ref_cnt) == 0)
     {
-      listener = pool_elt_at_index (mm->listeners, mif->listener_index);
-      if (--listener->usage_counter == 0)
+      if (msf->is_listener)
 	{
-	  /* not used anymore -> remove the socket and pending connections */
-
-	  /* *INDENT-OFF* */
-	  pool_foreach (pending_conn, mm->pending_conns,
-	    ({
-	       if (pending_conn->listener_index == mif->listener_index)
-	         {
-		   memif_remove_pending_conn (pending_conn);
-	         }
-	     }));
-          /* *INDENT-ON* */
-
-	  unix_file_del (&unix_main,
-			 unix_main.file_pool + listener->socket.index);
-	  pool_put (mm->listeners, listener);
-	  unlink ((char *) mif->socket_filename);
+	  uword *x;
+	  memif_file_del_by_index (msf->unix_file_index);
+	  vec_foreach (x, msf->pending_file_indices)
+	  {
+	    memif_file_del_by_index (*x);
+	  }
+	  vec_free (msf->pending_file_indices);
 	}
+      mhash_free (&msf->dev_instance_by_id);
+      hash_free (msf->dev_instance_by_fd);
+      mhash_unset (&mm->socket_file_index_by_filename, msf->filename, 0);
+      vec_free (msf->filename);
+      pool_put (mm->socket_files, msf);
     }
 
-  clib_spinlock_free (&mif->lockp);
-
-  mhash_unset (&mm->if_index_by_key, &mif->key, &mif->if_index);
-  vec_free (mif->socket_filename);
-  vec_free (mif->ring_data);
-
   memset (mif, 0, sizeof (*mif));
   pool_put (mm->interfaces, mif);
-}
 
-int
-memif_worker_thread_enable ()
-{
-  /* if worker threads are enabled, switch to polling mode */
-  /* *INDENT-OFF* */
-  foreach_vlib_main ((
-		       {
-		       vlib_node_set_state (this_vlib_main,
-					    memif_input_node.index,
-					    VLIB_NODE_STATE_POLLING);
-		       }));
-  /* *INDENT-ON* */
-  return 0;
-}
+  if (pool_elts (mm->interfaces) == 0)
+    vlib_process_signal_event (vm, memif_process_node.index,
+			       MEMIF_PROCESS_EVENT_STOP, 0);
 
-int
-memif_worker_thread_disable ()
-{
-  /* *INDENT-OFF* */
-  foreach_vlib_main ((
-		       {
-		       vlib_node_set_state (this_vlib_main,
-					    memif_input_node.index,
-					    VLIB_NODE_STATE_INTERRUPT);
-		       }));
-  /* *INDENT-ON* */
   return 0;
 }
 
@@ -846,19 +526,92 @@ memif_create_if (vlib_main_t * vm, memif_create_if_args_t * args)
   clib_error_t *error = 0;
   int ret = 0;
   uword *p;
+  vnet_hw_interface_t *hw;
+  memif_socket_file_t *msf = 0;
+  u8 *socket_filename;
+  int rv = 0;
+
+  if (args->socket_filename == 0 || args->socket_filename[0] != '/')
+    {
+      rv = mkdir (MEMIF_DEFAULT_SOCKET_DIR, 0755);
+      if (rv && errno != EEXIST)
+	return VNET_API_ERROR_SYSCALL_ERROR_1;
+
+      if (args->socket_filename == 0)
+	socket_filename = format (0, "%s/%s%c", MEMIF_DEFAULT_SOCKET_DIR,
+				  MEMIF_DEFAULT_SOCKET_FILENAME, 0);
+      else
+	socket_filename = format (0, "%s/%s%c", MEMIF_DEFAULT_SOCKET_DIR,
+				  args->socket_filename, 0);
+
+    }
+  else
+    socket_filename = vec_dup (args->socket_filename);
+
+  p = mhash_get (&mm->socket_file_index_by_filename, socket_filename);
 
-  p = mhash_get (&mm->if_index_by_key, &args->key);
   if (p)
-    return VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
+    {
+      msf = vec_elt_at_index (mm->socket_files, p[0]);
+
+      /* existing socket file can be either master or slave but cannot be both */
+      if (!msf->is_listener != !args->is_master)
+	{
+	  rv = VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
+	  goto done;
+	}
+
+      p = mhash_get (&msf->dev_instance_by_id, &args->id);
+      if (p)
+	{
+	  rv = VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
+	  goto done;
+	}
+    }
+
+  /* Create new socket file */
+  if (msf == 0)
+    {
+      struct stat file_stat;
+      /* If we are creating listener make sure file doesn't exist or if it
+       * exists thn delete it if it is old socket file */
+      if (args->is_master &&
+	  (stat ((char *) socket_filename, &file_stat) == 0))
+	{
+	  if (S_ISSOCK (file_stat.st_mode))
+	    {
+	      unlink ((char *) socket_filename);
+	    }
+	  else
+	    {
+	      ret = VNET_API_ERROR_SYSCALL_ERROR_3;
+	      goto error;
+	    }
+	}
+      pool_get (mm->socket_files, msf);
+      memset (msf, 0, sizeof (memif_socket_file_t));
+      mhash_init (&msf->dev_instance_by_id, sizeof (uword),
+		  sizeof (memif_interface_id_t));
+      msf->dev_instance_by_fd = hash_create (0, sizeof (uword));
+      msf->filename = socket_filename;
+      msf->fd = -1;
+      msf->is_listener = (args->is_master != 0);
+      socket_filename = 0;
+      mhash_set (&mm->socket_file_index_by_filename, msf->filename,
+		 msf - mm->socket_files, 0);
+      DBG ("creating socket file %s", msf->filename);
+    }
 
   pool_get (mm->interfaces, mif);
   memset (mif, 0, sizeof (*mif));
-  mif->key = args->key;
-  mif->if_index = mif - mm->interfaces;
+  mif->dev_instance = mif - mm->interfaces;
+  mif->socket_file_index = msf - mm->socket_files;
+  mif->id = args->id;
   mif->sw_if_index = mif->hw_if_index = mif->per_interface_next_index = ~0;
-  mif->listener_index = ~0;
-  mif->connection.index = mif->interrupt_line.index = ~0;
-  mif->connection.fd = mif->interrupt_line.fd = -1;
+  mif->conn_unix_file_index = ~0;
+  mif->conn_fd = -1;
+  if (args->secret)
+    mif->secret = vec_dup (args->secret);
 
   if (tm->n_vlib_mains > 1)
     clib_spinlock_init (&mif->lockp);
@@ -876,137 +629,94 @@ memif_create_if (vlib_main_t * vm, memif_create_if_args_t * args)
     }
 
   error = ethernet_register_interface (vnm, memif_device_class.index,
-				       mif->if_index, args->hw_addr,
+				       mif->dev_instance, args->hw_addr,
 				       &mif->hw_if_index,
 				       memif_eth_flag_change);
 
   if (error)
     {
       clib_error_report (error);
-      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
+      ret = VNET_API_ERROR_SYSCALL_ERROR_2;
       goto error;
     }
 
   sw = vnet_get_hw_sw_interface (vnm, mif->hw_if_index);
   mif->sw_if_index = sw->sw_if_index;
 
-  mif->log2_ring_size = args->log2_ring_size;
-  mif->buffer_size = args->buffer_size;
-
-  mif->num_s2m_rings = args->rx_queues;
-  mif->num_m2s_rings = args->tx_queues;
-
-  mhash_set_mem (&mm->if_index_by_key, &args->key, &mif->if_index, 0);
-
-  if (args->socket_filename != 0)
-    mif->socket_filename = args->socket_filename;
-  else
-    mif->socket_filename = vec_dup (mm->default_socket_filename);
+  mif->cfg.log2_ring_size = args->log2_ring_size;
+  mif->cfg.buffer_size = args->buffer_size;
+  mif->cfg.num_s2m_rings =
+    args->is_master ? args->rx_queues : args->tx_queues;
+  mif->cfg.num_m2s_rings =
+    args->is_master ? args->tx_queues : args->rx_queues;
 
   args->sw_if_index = mif->sw_if_index;
 
-  if (args->is_master)
+  /* If this is new one, start listening */
+  if (msf->is_listener && msf->ref_cnt == 0)
     {
       struct sockaddr_un un = { 0 };
       struct stat file_stat;
       int on = 1;
-      memif_listener_t *listener = 0;
-
-      if (stat ((char *) mif->socket_filename, &file_stat) == 0)
-	{
-	  if (!S_ISSOCK (file_stat.st_mode))
-	    {
-	      errno = ENOTSOCK;
-	      ret = VNET_API_ERROR_SYSCALL_ERROR_2;
-	      goto error;
-	    }
-	  /* *INDENT-OFF* */
-	  pool_foreach (listener, mm->listeners,
-	    ({
-	       if (listener->sock_dev == file_stat.st_dev &&
-		   listener->sock_ino == file_stat.st_ino)
-	         {
-		   /* attach memif to the existing listener */
-		   mif->listener_index = listener->index;
-		   ++listener->usage_counter;
-		   goto signal;
-	         }
-	     }));
-          /* *INDENT-ON* */
-	  unlink ((char *) mif->socket_filename);
-	}
 
-      pool_get (mm->listeners, listener);
-      memset (listener, 0, sizeof (*listener));
-      listener->socket.fd = -1;
-      listener->socket.index = ~0;
-      listener->index = listener - mm->listeners;
-      listener->usage_counter = 1;
-
-      if ((listener->socket.fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
+      if ((msf->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0)) < 0)
 	{
-	  ret = VNET_API_ERROR_SYSCALL_ERROR_3;
+	  ret = VNET_API_ERROR_SYSCALL_ERROR_4;
 	  goto error;
 	}
 
       un.sun_family = AF_UNIX;
-      strncpy ((char *) un.sun_path, (char *) mif->socket_filename,
+      strncpy ((char *) un.sun_path, (char *) msf->filename,
 	       sizeof (un.sun_path) - 1);
 
-      if (setsockopt (listener->socket.fd, SOL_SOCKET, SO_PASSCRED,
-		      &on, sizeof (on)) < 0)
-	{
-	  ret = VNET_API_ERROR_SYSCALL_ERROR_4;
-	  goto error;
-	}
-      if (bind (listener->socket.fd, (struct sockaddr *) &un,
-		sizeof (un)) == -1)
+      if (setsockopt (msf->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
 	{
 	  ret = VNET_API_ERROR_SYSCALL_ERROR_5;
 	  goto error;
 	}
-      if (listen (listener->socket.fd, 1) == -1)
+      if (bind (msf->fd, (struct sockaddr *) &un, sizeof (un)) == -1)
 	{
 	  ret = VNET_API_ERROR_SYSCALL_ERROR_6;
 	  goto error;
 	}
-
-      if (stat ((char *) mif->socket_filename, &file_stat) == -1)
+      if (listen (msf->fd, 1) == -1)
 	{
 	  ret = VNET_API_ERROR_SYSCALL_ERROR_7;
 	  goto error;
 	}
 
-      listener->sock_dev = file_stat.st_dev;
-      listener->sock_ino = file_stat.st_ino;
+      if (stat ((char *) msf->filename, &file_stat) == -1)
+	{
+	  ret = VNET_API_ERROR_SYSCALL_ERROR_8;
+	  goto error;
+	}
 
+      msf->unix_file_index = ~0;
       unix_file_t template = { 0 };
       template.read_function = memif_conn_fd_accept_ready;
-      template.file_descriptor = listener->socket.fd;
-      template.private_data = listener->index;
-      listener->socket.index = unix_file_add (&unix_main, &template);
-
-      mif->listener_index = listener->index;
-    }
-  else
-    {
-      mif->flags |= MEMIF_IF_FLAG_IS_SLAVE;
+      template.file_descriptor = msf->fd;
+      template.private_data = mif->socket_file_index;
+      memif_file_add (&msf->unix_file_index, &template);
     }
 
-#if 0
-  /* use configured or generate random MAC address */
-  if (!args->hw_addr_set &&
-      tm->n_vlib_mains > 1 && pool_elts (mm->interfaces) == 1)
-    memif_worker_thread_enable ();
-#endif
+  msf->ref_cnt++;
+
+  if (args->is_master == 0)
+    mif->flags |= MEMIF_IF_FLAG_IS_SLAVE;
+
+  hw = vnet_get_hw_interface (vnm, mif->hw_if_index);
+  hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
+  vnet_hw_interface_set_input_node (vnm, mif->hw_if_index,
+				    memif_input_node.index);
+
+  mhash_set (&msf->dev_instance_by_id, &mif->id, mif->dev_instance, 0);
 
-signal:
   if (pool_elts (mm->interfaces) == 1)
     {
       vlib_process_signal_event (vm, memif_process_node.index,
 				 MEMIF_PROCESS_EVENT_START, 0);
     }
-  return 0;
+  goto done;
 
 error:
   if (mif->hw_if_index != ~0)
@@ -1014,89 +724,31 @@ error:
       ethernet_delete_interface (vnm, mif->hw_if_index);
       mif->hw_if_index = ~0;
     }
-  memif_close_if (mm, mif);
+  memif_delete_if (vm, mif);
   return ret;
-}
-
-int
-memif_delete_if (vlib_main_t * vm, u64 key)
-{
-  vnet_main_t *vnm = vnet_get_main ();
-  memif_main_t *mm = &memif_main;
-  memif_if_t *mif;
-  uword *p;
-  u32 hw_if_index;
-
-  p = mhash_get (&mm->if_index_by_key, &key);
-  if (p == NULL)
-    {
-      DEBUG_LOG ("Memory interface with key 0x%" PRIx64 " does not exist",
-		 key);
-      return VNET_API_ERROR_SYSCALL_ERROR_1;
-    }
-  mif = pool_elt_at_index (mm->interfaces, p[0]);
-  mif->flags |= MEMIF_IF_FLAG_DELETING;
-
-  /* bring down the interface */
-  vnet_sw_interface_set_flags (vnm, mif->sw_if_index, 0);
-
-  hw_if_index = mif->hw_if_index;
-  memif_close_if (mm, mif);
-
-  /* remove the interface */
-  ethernet_delete_interface (vnm, hw_if_index);
-  if (pool_elts (mm->interfaces) == 0)
-    {
-      vlib_process_signal_event (vm, memif_process_node.index,
-				 MEMIF_PROCESS_EVENT_STOP, 0);
-    }
-
-#if 0
-  if (tm->n_vlib_mains > 1 && pool_elts (mm->interfaces) == 0)
-    memif_worker_thread_disable ();
-#endif
 
-  return 0;
+done:
+  vec_free (socket_filename);
+  return rv;
 }
 
+
 static clib_error_t *
 memif_init (vlib_main_t * vm)
 {
   memif_main_t *mm = &memif_main;
   vlib_thread_main_t *tm = vlib_get_thread_main ();
-  vlib_thread_registration_t *tr;
-  uword *p;
 
   memset (mm, 0, sizeof (memif_main_t));
 
-  mm->input_cpu_first_index = 0;
-  mm->input_cpu_count = 1;
-
   /* initialize binary API */
   memif_plugin_api_hookup (vm);
 
-  /* find out which cpus will be used for input */
-  p = hash_get_mem (tm->thread_registrations_by_name, "workers");
-  tr = p ? (vlib_thread_registration_t *) p[0] : 0;
-
-  if (tr && tr->count > 0)
-    {
-      mm->input_cpu_first_index = tr->first_index;
-      mm->input_cpu_count = tr->count;
-    }
-
-  mhash_init (&mm->if_index_by_key, sizeof (uword), sizeof (u64));
+  mhash_init_c_string (&mm->socket_file_index_by_filename, sizeof (uword));
 
   vec_validate_aligned (mm->rx_buffers, tm->n_vlib_mains - 1,
 			CLIB_CACHE_LINE_BYTES);
 
-  /* set default socket filename */
-  vec_validate (mm->default_socket_filename,
-		strlen (MEMIF_DEFAULT_SOCKET_FILENAME));
-  strncpy ((char *) mm->default_socket_filename,
-	   MEMIF_DEFAULT_SOCKET_FILENAME,
-	   vec_len (mm->default_socket_filename) - 1);
-
   return 0;
 }
 
diff --git a/src/plugins/memif/memif.h b/src/plugins/memif/memif.h
index 56028a25..30a27dc2 100644
--- a/src/plugins/memif/memif.h
+++ b/src/plugins/memif/memif.h
@@ -1,6 +1,6 @@
 /*
  *------------------------------------------------------------------
- * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Copyright (c) 2017 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
@@ -15,278 +15,158 @@
  *------------------------------------------------------------------
  */
 
-#include <vppinfra/lock.h>
+#ifndef _MEMIF_H_
+#define _MEMIF_H_
 
-typedef struct
-{
-  u16 version;
-#define MEMIF_VERSION_MAJOR 0
-#define MEMIF_VERSION_MINOR 1
-#define MEMIF_VERSION ((MEMIF_VERSION_MAJOR << 8) | MEMIF_VERSION_MINOR)
-  u8 type;
-#define MEMIF_MSG_TYPE_CONNECT_REQ  0
-#define MEMIF_MSG_TYPE_CONNECT_RESP 1
-#define MEMIF_MSG_TYPE_DISCONNECT   2
-
-  /* Connection-request parameters: */
-  u64 key;
-  u8 log2_ring_size;
-#define MEMIF_DEFAULT_RING_SIZE 1024
-  u16 num_s2m_rings;
-#define MEMIF_DEFAULT_RX_QUEUES 1
-  u16 num_m2s_rings;
-#define MEMIF_DEFAULT_TX_QUEUES 1
-  u16 buffer_size;
-#define MEMIF_DEFAULT_BUFFER_SIZE 2048
-  u32 shared_mem_size;
-
-  /* Connection-response parameters: */
-  u8 retval;
-} memif_msg_t;
-
-typedef struct __attribute__ ((packed))
-{
-  u16 flags;
-#define MEMIF_DESC_FLAG_NEXT (1 << 0)
-  u16 region;
-  u32 buffer_length;
-  u32 length;;
-  u8 reserved[4];
-  u64 offset;
-  u64 metadata;
-} memif_desc_t;
+#ifndef MEMIF_CACHELINE_SIZE
+#define MEMIF_CACHELINE_SIZE 64
+#endif
 
-STATIC_ASSERT_SIZEOF (memif_desc_t, 32);
+/*
+ *  Type definitions
+ */
 
-typedef struct
+typedef enum memif_msg_type
 {
-  u16 head __attribute__ ((aligned (128)));
-  u16 tail __attribute__ ((aligned (128)));
-  memif_desc_t desc[0] __attribute__ ((aligned (128)));
-} memif_ring_t;
+  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 struct
+typedef enum
 {
-  u32 cookie __attribute__ ((aligned (128)));
-} memif_shm_t;
-
+  MEMIF_RING_S2M = 0,
+  MEMIF_RING_M2S = 1
+} memif_ring_type_t;
 
-typedef struct
+typedef enum
 {
-  u16 last_head;
-  u16 last_tail;
-} memif_ring_data_t;
+  MEMIF_INTERFACE_MODE_ETHERNET = 0,
+  MEMIF_INTERFACE_MODE_IP = 1,
+  MEMIF_INTERFACE_MODE_PUNT_INJECT = 2,
+} memif_interface_mode_t;
 
-typedef struct
-{
-  int fd;
-  u32 index;
-} memif_file_t;
+typedef uint16_t memif_region_index_t;
+typedef uint16_t memif_ring_index_t;
+typedef uint32_t memif_interface_id_t;
+typedef uint16_t memif_version_t;
 
-typedef struct
-{
-  uword index;
-  dev_t sock_dev;
-  ino_t sock_ino;
-  memif_file_t socket;
-  u16 usage_counter;
-} memif_listener_t;
+/*
+ *  Socket messages
+ */
 
-typedef struct
+typedef struct __attribute__ ((packed))
 {
-  uword index;
-  memif_file_t connection;
-  uword listener_index;
-} memif_pending_conn_t;
+  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;
+  uint8_t max_log2_ring_size;
+} memif_msg_hello_t;
 
-typedef struct
+typedef struct __attribute__ ((packed))
 {
-  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
-  clib_spinlock_t lockp;
-  u32 flags;
-#define MEMIF_IF_FLAG_ADMIN_UP   (1 << 0)
-#define MEMIF_IF_FLAG_IS_SLAVE   (1 << 1)
-#define MEMIF_IF_FLAG_CONNECTING (1 << 2)
-#define MEMIF_IF_FLAG_CONNECTED  (1 << 3)
-#define MEMIF_IF_FLAG_DELETING   (1 << 4)
-
-  u64 key;
-  uword if_index;
-  u32 hw_if_index;
-  u32 sw_if_index;
-
-  u32 per_interface_next_index;
-
-  uword listener_index;
-  memif_file_t connection;
-  memif_file_t interrupt_line;
-  u8 *socket_filename;
+  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;
 
-  void **regions;
-
-  u8 log2_ring_size;
-  u8 num_s2m_rings;
-  u8 num_m2s_rings;
-  u16 buffer_size;
-  u32 shared_mem_size;
-
-  memif_ring_data_t *ring_data;
-
-  /* remote info */
-  pid_t remote_pid;
-  uid_t remote_uid;
-} memif_if_t;
-
-typedef struct
+typedef struct __attribute__ ((packed))
 {
-  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
-
-  /** API message ID base */
-  u16 msg_id_base;
-
-  /* pool of all memory interfaces */
-  memif_if_t *interfaces;
-
-  /* pool of all listeners */
-  memif_listener_t *listeners;
-
-  /* pool of pending connections */
-  memif_pending_conn_t *pending_conns;
-
-  /* bitmap of pending rx interfaces */
-  uword *pending_input_bitmap;
-
-  /* rx buffer cache */
-  u32 **rx_buffers;
-
-  /* hash of all registered keys */
-  mhash_t if_index_by_key;
-
-  /* first cpu index */
-  u32 input_cpu_first_index;
-
-  /* total cpu count */
-  u32 input_cpu_count;
-
-  /* configuration */
-  u8 *default_socket_filename;
-#define MEMIF_DEFAULT_SOCKET_FILENAME  "/var/vpp/memif.sock"
-} memif_main_t;
+  memif_region_index_t index;
+  uint32_t size;
+} memif_msg_add_region_t;
 
-extern memif_main_t memif_main;
-extern vnet_device_class_t memif_device_class;
-extern vlib_node_registration_t memif_input_node;
-
-enum
+typedef struct __attribute__ ((packed))
 {
-  MEMIF_PROCESS_EVENT_START = 1,
-  MEMIF_PROCESS_EVENT_STOP = 2,
-} memif_process_event_t;
+  uint16_t flags;
+#define MEMIF_MSG_ADD_RING_FLAG_S2M	(1 << 0)
+  memif_ring_index_t index;
+  memif_region_index_t region;
+  uint32_t offset;
+  uint8_t log2_ring_size;
+} memif_msg_add_ring_t;
 
-typedef struct
+typedef struct __attribute__ ((packed))
 {
-  u64 key;
-  u8 *socket_filename;
-  u8 is_master;
-  u8 log2_ring_size;
-  u16 buffer_size;
-  u8 hw_addr_set;
-  u8 hw_addr[6];
-  u8 rx_queues;
-  u8 tx_queues;
-
-  /* return */
-  u32 sw_if_index;
-} memif_create_if_args_t;
+  uint8_t if_name[32];
+} memif_msg_connect_t;
 
-int memif_create_if (vlib_main_t * vm, memif_create_if_args_t * args);
-int memif_delete_if (vlib_main_t * vm, u64 key);
-void memif_disconnect (vlib_main_t * vm, memif_if_t * mif);
-clib_error_t *memif_plugin_api_hookup (vlib_main_t * vm);
-
-#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
-
-static_always_inline u8
-memif_get_rx_queues (memif_if_t * mif)
+typedef struct __attribute__ ((packed))
 {
-  u8 rx_queues;
+  uint8_t if_name[32];
+} memif_msg_connected_t;
 
-  if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
-    rx_queues = mif->num_m2s_rings;
-  else
-    rx_queues = mif->num_s2m_rings;
-
-  return (rx_queues);
-}
-
-static_always_inline u8
-memif_get_tx_queues (memif_if_t * mif)
+typedef struct __attribute__ ((packed))
 {
-  u8 tx_queues;
-
-  if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
-    tx_queues = mif->num_s2m_rings;
-  else
-    tx_queues = mif->num_m2s_rings;
+  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;
 
-  return (tx_queues);
-}
+_Static_assert (sizeof (memif_msg_t) == 128,
+		"Size of memif_msg_t must be 128");
 
-static inline int
-memfd_create (const char *name, unsigned int flags)
-{
-  return syscall (__NR_memfd_create, name, flags);
-}
+/*
+ *  Ring and Descriptor Layout
+ */
 
-typedef enum
+typedef struct __attribute__ ((packed))
 {
-  MEMIF_RING_S2M = 0,
-  MEMIF_RING_M2S = 1
-} memif_ring_type_t;
+  uint16_t flags;
+#define MEMIF_DESC_FLAG_NEXT (1 << 0)
+  memif_region_index_t region;
+  uint32_t buffer_length;
+  uint32_t length;
+  uint8_t reserved[4];
+  uint64_t offset;
+  uint64_t metadata;
+} memif_desc_t;
 
-static_always_inline memif_ring_t *
-memif_get_ring (memif_if_t * mif, memif_ring_type_t type, u16 ring_num)
-{
-  if (vec_len (mif->regions) == 0)
-    return NULL;
-  void *p = mif->regions[0];
-  int ring_size =
-    sizeof (memif_ring_t) +
-    sizeof (memif_desc_t) * (1 << mif->log2_ring_size);
-  p += sizeof (memif_shm_t);
-  p += (ring_num + type * mif->num_s2m_rings) * ring_size;
+_Static_assert (sizeof (memif_desc_t) == 32,
+		"Size of memif_dsct_t must be 32");
 
-  return (memif_ring_t *) p;
-}
+#define MEMIF_CACHELINE_ALIGN_MARK(mark) \
+  uint8_t mark[0] __attribute__((aligned(MEMIF_CACHELINE_SIZE)))
 
-static_always_inline void *
-memif_get_buffer (memif_if_t * mif, memif_ring_t * ring, u16 slot)
+typedef struct
 {
-  u16 region = ring->desc[slot].region;
-  return mif->regions[region] + ring->desc[slot].offset;
-}
-
-#ifndef F_LINUX_SPECIFIC_BASE
-#define F_LINUX_SPECIFIC_BASE 1024
-#endif
-#define MFD_ALLOW_SEALING       0x0002U
-#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
-#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
+  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;
 
-#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 /* _MEMIF_H_ */
 
 /*
  * fd.io coding-style-patch-verification: ON
diff --git a/src/plugins/memif/memif_api.c b/src/plugins/memif/memif_api.c
index 1470f944..533e8482 100644
--- a/src/plugins/memif/memif_api.c
+++ b/src/plugins/memif/memif_api.c
@@ -19,7 +19,9 @@
 
 #include <vlib/vlib.h>
 #include <vnet/ethernet/ethernet.h>
+#include <vlib/unix/unix.h>
 #include <memif/memif.h>
+#include <memif/private.h>
 
 #include <vlibapi/api.h>
 #include <vlibmemory/api.h>
@@ -107,8 +109,8 @@ vl_api_memif_create_t_handler (vl_api_memif_create_t * mp)
   static const u8 empty_hw_addr[6];
   int rv = 0;
 
-  /* key */
-  args.key = clib_net_to_host_u64 (mp->key);
+  /* id */
+  args.id = clib_net_to_host_u32 (mp->id);
 
   /* socket filename */
   mp->socket_filename[ARRAY_LEN (mp->socket_filename) - 1] = 0;
@@ -120,6 +122,15 @@ vl_api_memif_create_t_handler (vl_api_memif_create_t * mp)
 	       vec_len (args.socket_filename));
     }
 
+  /* secret */
+  mp->secret[ARRAY_LEN (mp->secret) - 1] = 0;
+  if (strlen ((char *) mp->secret) > 0)
+    {
+      vec_validate (args.secret, strlen ((char *) mp->secret));
+      strncpy ((char *) args.secret, (char *) mp->secret,
+	       vec_len (args.secret));
+    }
+
   /* role */
   args.is_master = (mp->role == 0);
   if (args.is_master == 0)
@@ -156,6 +167,9 @@ vl_api_memif_create_t_handler (vl_api_memif_create_t * mp)
 
   rv = memif_create_if (vm, &args);
 
+  vec_free (args.socket_filename);
+  vec_free (args.secret);
+
 reply:
   /* *INDENT-OFF* */
   REPLY_MACRO2 (VL_API_MEMIF_CREATE_REPLY,
@@ -173,26 +187,19 @@ void
 vl_api_memif_delete_t_handler (vl_api_memif_delete_t * mp)
 {
   memif_main_t *mm = &memif_main;
-  memif_if_t *mif;
   vlib_main_t *vm = vlib_get_main ();
+  vnet_main_t *vnm = vnet_get_main ();
   vl_api_memif_delete_reply_t *rmp;
-  u32 sw_if_index = ntohl (mp->sw_if_index);
+  vnet_hw_interface_t *hi =
+    vnet_get_sup_hw_interface (vnm, ntohl (mp->sw_if_index));
+  memif_if_t *mif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
   int rv = 0;
 
-  /* *INDENT-OFF* */
-  pool_foreach (mif, mm->interfaces,
-    ({
-      if (sw_if_index == mif->sw_if_index)
-	{
-	  rv = memif_delete_if (vm, mif->key);
-	  goto reply;
-	}
-    }));
-  /* *INDENT-ON* */
-
-  rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;
+  if (hi == NULL || memif_device_class.index != hi->dev_class_index)
+    rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;
+  else
+    rv = memif_delete_if (vm, mif);
 
-reply:
   REPLY_MACRO (VL_API_MEMIF_DELETE_REPLY);
 }
 
@@ -205,6 +212,8 @@ send_memif_details (unix_shared_memory_queue_t * q,
   vl_api_memif_details_t *mp;
   vnet_main_t *vnm = vnet_get_main ();
   memif_main_t *mm = &memif_main;
+  memif_socket_file_t *msf = vec_elt_at_index (mm->socket_files,
+					       mif->socket_file_index);
   vnet_hw_interface_t *hwif;
 
   hwif = vnet_get_sup_hw_interface (vnm, swif->sw_if_index);
@@ -220,14 +229,13 @@ send_memif_details (unix_shared_memory_queue_t * q,
 	   (char *) interface_name, ARRAY_LEN (mp->if_name) - 1);
   memcpy (mp->hw_addr, hwif->hw_address, ARRAY_LEN (mp->hw_addr));
 
-  mp->key = clib_host_to_net_u64 (mif->key);
+  mp->id = clib_host_to_net_u32 (mif->id);
   mp->role = (mif->flags & MEMIF_IF_FLAG_IS_SLAVE) ? 1 : 0;
   strncpy ((char *) mp->socket_filename,
-	   (char *) mif->socket_filename,
-	   ARRAY_LEN (mp->socket_filename) - 1);
+	   (char *) msf->filename, ARRAY_LEN (mp->socket_filename) - 1);
 
-  mp->ring_size = htonl (1 << mif->log2_ring_size);
-  mp->buffer_size = htons (mif->buffer_size);
+  mp->ring_size = htonl (1 << mif->run.log2_ring_size);
+  mp->buffer_size = htons (mif->run.buffer_size);
 
   mp->admin_up_down = (swif->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ? 1 : 0;
   mp->link_up_down = (hwif->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) ? 1 : 0;
diff --git a/src/plugins/memif/memif_test.c b/src/plugins/memif/memif_test.c
index c1ba9273..cbef4dfa 100644
--- a/src/plugins/memif/memif_test.c
+++ b/src/plugins/memif/memif_test.c
@@ -24,6 +24,7 @@
 #include <vppinfra/error.h>
 #include <vnet/ip/ip.h>
 #include <memif/memif.h>
+#include <memif/private.h>
 
 #define __plugin_msg_base memif_test_main.msg_id_base
 #include <vlibapi/vat_helper_macros.h>
@@ -118,8 +119,9 @@ api_memif_create (vat_main_t * vam)
 {
   unformat_input_t *i = vam->input;
   vl_api_memif_create_t *mp;
-  u64 key = 0;
+  u32 id = 0;
   u8 *socket_filename = 0;
+  u8 *secret = 0;
   u8 role = 1;
   u32 ring_size = 0;
   u32 buffer_size = 0;
@@ -131,10 +133,12 @@ api_memif_create (vat_main_t * vam)
 
   while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
     {
-      if (unformat (i, "key 0x%" PRIx64, &key))
+      if (unformat (i, "id %u", &id))
 	;
       else if (unformat (i, "socket %s", &socket_filename))
 	;
+      else if (unformat (i, "secret %s", &secret))
+	;
       else if (unformat (i, "ring_size %u", &ring_size))
 	;
       else if (unformat (i, "buffer_size %u", &buffer_size))
@@ -173,7 +177,7 @@ api_memif_create (vat_main_t * vam)
 
   M (MEMIF_CREATE, mp);
 
-  mp->key = clib_host_to_net_u64 (key);
+  mp->id = clib_host_to_net_u32 (id);
   mp->role = role;
   mp->ring_size = clib_host_to_net_u32 (ring_size);
   mp->buffer_size = clib_host_to_net_u16 (buffer_size & 0xffff);
@@ -182,6 +186,11 @@ api_memif_create (vat_main_t * vam)
       strncpy ((char *) mp->socket_filename, (char *) socket_filename, 127);
       vec_free (socket_filename);
     }
+  if (socket_filename != 0)
+    {
+      strncpy ((char *) mp->secret, (char *) secret, 16);
+      vec_free (socket_filename);
+    }
   memcpy (mp->hw_addr, hw_addr, 6);
   mp->rx_queues = rx_queues;
   mp->tx_queues = tx_queues;
@@ -282,11 +291,11 @@ static void vl_api_memif_details_t_handler (vl_api_memif_details_t * mp)
   vat_main_t *vam = memif_test_main.vat_main;
 
   fformat (vam->ofp, "%s: sw_if_index %u mac %U\n"
-	   "   key 0x%" PRIx64 " socket %s role %s\n"
+	   "   id %u socket %s role %s\n"
 	   "   ring_size %u buffer_size %u\n"
 	   "   state %s link %s\n",
 	   mp->if_name, ntohl (mp->sw_if_index), format_ethernet_address,
-	   mp->hw_addr, clib_net_to_host_u64 (mp->key), mp->socket_filename,
+	   mp->hw_addr, clib_net_to_host_u32 (mp->id), mp->socket_filename,
 	   mp->role ? "slave" : "master",
 	   ntohl (mp->ring_size), ntohs (mp->buffer_size),
 	   mp->admin_up_down ? "up" : "down",
@@ -298,7 +307,7 @@ static void vl_api_memif_details_t_handler (vl_api_memif_details_t * mp)
  * and that the data plane plugin processes
  */
 #define foreach_vpe_api_msg					  \
-_(memif_create, "[key <key>] [socket <path>] [ring_size <size>] " \
+_(memif_create, "[id <id>] [socket <path>] [ring_size <size>] " \
 		"[buffer_size <size>] [hw_addr <mac_address>] "   \
 		"<master|slave>")				  \
 _(memif_delete, "<sw_if_index>")                                  \
diff --git a/src/plugins/memif/node.c b/src/plugins/memif/node.c
index fd7baa30..e2c7631c 100644
--- a/src/plugins/memif/node.c
+++ b/src/plugins/memif/node.c
@@ -28,6 +28,7 @@
 #include <vnet/feature/feature.h>
 
 #include <memif/memif.h>
+#include <memif/private.h>
 
 #define foreach_memif_input_error
 
@@ -78,11 +79,11 @@ memif_prefetch (vlib_main_t * vm, u32 bi)
 static_always_inline uword
 memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 			   vlib_frame_t * frame, memif_if_t * mif,
-			   memif_ring_type_t type, u16 rid)
+			   memif_ring_type_t type, u16 qid)
 {
   vnet_main_t *vnm = vnet_get_main ();
-  memif_ring_t *ring = memif_get_ring (mif, type, rid);
-  memif_ring_data_t *rd;
+  memif_ring_t *ring;
+  memif_queue_t *mq;
   u16 head;
   u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
   uword n_trace = vlib_get_trace_count (vm, node);
@@ -94,12 +95,14 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
   u32 thread_index = vlib_get_thread_index ();
   u32 bi0, bi1;
   vlib_buffer_t *b0, *b1;
-  u16 ring_size = 1 << mif->log2_ring_size;
-  u16 mask = ring_size - 1;
-  u16 num_slots;
+  u16 ring_size, mask, num_slots;
   void *mb0, *mb1;
 
-  rd = vec_elt_at_index (mif->ring_data, rid + type * mif->num_s2m_rings);
+  mq = vec_elt_at_index (mif->rx_queues, qid);
+  ring = mq->ring;
+  ring_size = 1 << mq->log2_ring_size;
+  mask = ring_size - 1;
+
   if (mif->per_interface_next_index != ~0)
     next_index = mif->per_interface_next_index;
 
@@ -115,13 +118,13 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
     }
 
   head = ring->head;
-  if (head == rd->last_head)
+  if (head == mq->last_head)
     return 0;
 
-  if (head > rd->last_head)
-    num_slots = head - rd->last_head;
+  if (head > mq->last_head)
+    num_slots = head - mq->last_head;
   else
-    num_slots = ring_size - rd->last_head + head;
+    num_slots = ring_size - mq->last_head + head;
 
   while (num_slots)
     {
@@ -132,28 +135,28 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 
       while (num_slots > 5 && n_left_to_next > 2)
 	{
-	  if (PREDICT_TRUE (rd->last_head + 5 < ring_size))
+	  if (PREDICT_TRUE (mq->last_head + 5 < ring_size))
 	    {
-	      CLIB_PREFETCH (memif_get_buffer (mif, ring, rd->last_head + 2),
+	      CLIB_PREFETCH (memif_get_buffer (mif, ring, mq->last_head + 2),
 			     CLIB_CACHE_LINE_BYTES, LOAD);
-	      CLIB_PREFETCH (memif_get_buffer (mif, ring, rd->last_head + 3),
+	      CLIB_PREFETCH (memif_get_buffer (mif, ring, mq->last_head + 3),
 			     CLIB_CACHE_LINE_BYTES, LOAD);
-	      CLIB_PREFETCH (&ring->desc[rd->last_head + 4],
+	      CLIB_PREFETCH (&ring->desc[mq->last_head + 4],
 			     CLIB_CACHE_LINE_BYTES, LOAD);
-	      CLIB_PREFETCH (&ring->desc[rd->last_head + 5],
+	      CLIB_PREFETCH (&ring->desc[mq->last_head + 5],
 			     CLIB_CACHE_LINE_BYTES, LOAD);
 	    }
 	  else
 	    {
 	      CLIB_PREFETCH (memif_get_buffer
-			     (mif, ring, (rd->last_head + 2) % mask),
+			     (mif, ring, (mq->last_head + 2) % mask),
 			     CLIB_CACHE_LINE_BYTES, LOAD);
 	      CLIB_PREFETCH (memif_get_buffer
-			     (mif, ring, (rd->last_head + 3) % mask),
+			     (mif, ring, (mq->last_head + 3) % mask),
 			     CLIB_CACHE_LINE_BYTES, LOAD);
-	      CLIB_PREFETCH (&ring->desc[(rd->last_head + 4) % mask],
+	      CLIB_PREFETCH (&ring->desc[(mq->last_head + 4) % mask],
 			     CLIB_CACHE_LINE_BYTES, LOAD);
-	      CLIB_PREFETCH (&ring->desc[(rd->last_head + 5) % mask],
+	      CLIB_PREFETCH (&ring->desc[(mq->last_head + 5) % mask],
 			     CLIB_CACHE_LINE_BYTES, LOAD);
 	    }
 	  /* get empty buffer */
@@ -185,17 +188,17 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	  vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 
 	  /* copy buffer */
-	  mb0 = memif_get_buffer (mif, ring, rd->last_head);
+	  mb0 = memif_get_buffer (mif, ring, mq->last_head);
 	  clib_memcpy (vlib_buffer_get_current (b0), mb0,
 		       CLIB_CACHE_LINE_BYTES);
-	  b0->current_length = ring->desc[rd->last_head].length;
-	  rd->last_head = (rd->last_head + 1) & mask;
+	  b0->current_length = ring->desc[mq->last_head].length;
+	  mq->last_head = (mq->last_head + 1) & mask;
 
-	  mb1 = memif_get_buffer (mif, ring, rd->last_head);
+	  mb1 = memif_get_buffer (mif, ring, mq->last_head);
 	  clib_memcpy (vlib_buffer_get_current (b1), mb1,
 		       CLIB_CACHE_LINE_BYTES);
-	  b1->current_length = ring->desc[rd->last_head].length;
-	  rd->last_head = (rd->last_head + 1) & mask;
+	  b1->current_length = ring->desc[mq->last_head].length;
+	  mq->last_head = (mq->last_head + 1) & mask;
 
 	  if (b0->current_length > CLIB_CACHE_LINE_BYTES)
 	    clib_memcpy (vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
@@ -221,7 +224,7 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
 	      tr->next_index = next0;
 	      tr->hw_if_index = mif->hw_if_index;
-	      tr->ring = rid;
+	      tr->ring = qid;
 
 	      if (n_trace)
 		{
@@ -233,7 +236,7 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		  tr = vlib_add_trace (vm, node, b1, sizeof (*tr));
 		  tr->next_index = next1;
 		  tr->hw_if_index = mif->hw_if_index;
-		  tr->ring = rid;
+		  tr->ring = qid;
 		}
 	    }
 
@@ -266,12 +269,12 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 
 	  /* fill buffer metadata */
 	  b0 = vlib_get_buffer (vm, bi0);
-	  b0->current_length = ring->desc[rd->last_head].length;
+	  b0->current_length = ring->desc[mq->last_head].length;
 	  vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
 	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 
 	  /* copy buffer */
-	  mb0 = memif_get_buffer (mif, ring, rd->last_head);
+	  mb0 = memif_get_buffer (mif, ring, mq->last_head);
 	  clib_memcpy (vlib_buffer_get_current (b0), mb0,
 		       CLIB_CACHE_LINE_BYTES);
 	  if (b0->current_length > CLIB_CACHE_LINE_BYTES)
@@ -291,7 +294,7 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
 	      tr->next_index = next0;
 	      tr->hw_if_index = mif->hw_if_index;
-	      tr->ring = rid;
+	      tr->ring = qid;
 	    }
 
 
@@ -303,7 +306,7 @@ memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 					   n_left_to_next, bi0, next0);
 
 	  /* next packet */
-	  rd->last_head = (rd->last_head + 1) & mask;
+	  mq->last_head = (mq->last_head + 1) & mask;
 	  num_slots--;
 	  n_rx_packets++;
 	  n_rx_bytes += b0->current_length;
@@ -325,30 +328,28 @@ static uword
 memif_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		vlib_frame_t * frame)
 {
-  u32 n_rx_packets = 0;
+  u32 n_rx = 0;
   memif_main_t *nm = &memif_main;
-  memif_if_t *mif;
   vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
   vnet_device_and_queue_t *dq;
-  memif_ring_type_t type;
 
   foreach_device_and_queue (dq, rt->devices_and_queues)
   {
+    memif_if_t *mif;
     mif = vec_elt_at_index (nm->interfaces, dq->dev_instance);
     if ((mif->flags & MEMIF_IF_FLAG_ADMIN_UP) &&
 	(mif->flags & MEMIF_IF_FLAG_CONNECTED))
       {
 	if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
-	  type = MEMIF_RING_M2S;
+	  n_rx += memif_device_input_inline (vm, node, frame, mif,
+					     MEMIF_RING_M2S, dq->queue_id);
 	else
-	  type = MEMIF_RING_S2M;
-	n_rx_packets +=
-	  memif_device_input_inline (vm, node, frame, mif, type,
-				     dq->queue_id);
+	  n_rx += memif_device_input_inline (vm, node, frame, mif,
+					     MEMIF_RING_S2M, dq->queue_id);
       }
   }
 
-  return n_rx_packets;
+  return n_rx;
 }
 
 /* *INDENT-OFF* */
diff --git a/src/plugins/memif/private.h b/src/plugins/memif/private.h
new file mode 100644
index 00000000..104706fa
--- /dev/null
+++ b/src/plugins/memif/private.h
@@ -0,0 +1,296 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <vppinfra/lock.h>
+
+#define MEMIF_DEFAULT_SOCKET_DIR "/run/vpp"
+#define MEMIF_DEFAULT_SOCKET_FILENAME  "memif.sock"
+#define MEMIF_DEFAULT_RING_SIZE 1024
+#define MEMIF_DEFAULT_RX_QUEUES 1
+#define MEMIF_DEFAULT_TX_QUEUES 1
+#define MEMIF_DEFAULT_BUFFER_SIZE 2048
+
+#define MEMIF_VERSION_MAJOR		0
+#define MEMIF_VERSION_MINOR		1
+#define MEMIF_VERSION			((MEMIF_VERSION_MAJOR << 8) | MEMIF_VERSION_MINOR)
+#define MEMIF_COOKIE			0xdeadbeef
+#define MEMIF_MAX_M2S_RING		(vec_len (vlib_mains) - 1)
+#define MEMIF_MAX_S2M_RING		(vec_len (vlib_mains) - 1)
+#define MEMIF_MAX_REGION		255
+#define MEMIF_MAX_LOG2_RING_SIZE	14
+
+#define MEMIF_DEBUG 0
+
+#if MEMIF_DEBUG == 1
+#define DBG(...) clib_warning(__VA_ARGS__)
+#define DBG_UNIX_LOG(...) clib_unix_warning(__VA_ARGS__)
+#else
+#define DBG(...)
+#define DBG_UNIX_LOG(...)
+#endif
+
+#if MEMIF_DEBUG == 1
+#define memif_file_add(a, b) do {					\
+  ASSERT (*a == ~0);							\
+  *a = unix_file_add (&unix_main, b);					\
+  clib_warning ("unix_file_add fd %d private_data %u idx %u",		\
+		(b)->file_descriptor, (b)->private_data, *a);		\
+} while (0)
+
+#define memif_file_del(a) do {						\
+  clib_warning ("unix_file_del idx %u",a - unix_main.file_pool);	\
+  unix_file_del (&unix_main, a);					\
+} while (0)
+
+#define memif_file_del_by_index(a) do {					\
+  clib_warning ("unix_file_del idx %u", a);				\
+  unix_file_del_by_index (&unix_main, a);				\
+} while (0)
+#else
+#define memif_file_add(a, b) do {					\
+  ASSERT (*a == ~0);							\
+  *a = unix_file_add (&unix_main, b);					\
+} while (0)
+#define memif_file_del(a) unix_file_del(&unix_main, a)
+#define memif_file_del_by_index(a) unix_file_del_by_index(&unix_main, a)
+#endif
+
+typedef struct
+{
+  u8 *filename;
+  int fd;
+  uword unix_file_index;
+  uword *pending_file_indices;
+  int ref_cnt;
+  int is_listener;
+
+  /* hash of all registered id */
+  mhash_t dev_instance_by_id;
+
+  /* hash of all registered fds */
+  uword *dev_instance_by_fd;
+} memif_socket_file_t;
+
+typedef struct
+{
+  void *shm;
+  u32 region_size;
+  int fd;
+} memif_region_t;
+
+typedef struct
+{
+  memif_msg_t msg;
+  int fd;
+} memif_msg_fifo_elt_t;
+
+typedef struct
+{
+  /* ring data */
+  memif_ring_t *ring;
+  u8 log2_ring_size;
+  u8 region;
+  u32 offset;
+
+  u16 last_head;
+  u16 last_tail;
+
+  /* interrupts */
+  int int_fd;
+  uword int_unix_file_index;
+  u64 int_count;
+} memif_queue_t;
+
+#define foreach_memif_if_flag \
+  _(0, ADMIN_UP, "admin-up")		\
+  _(1, IS_SLAVE, "slave")		\
+  _(2, CONNECTING, "connecting")	\
+  _(3, CONNECTED, "connected")		\
+  _(4, DELETING, "deleting")
+
+typedef enum
+{
+#define _(a, b, c) MEMIF_IF_FLAG_##b = (1 << a),
+  foreach_memif_if_flag
+#undef _
+} memif_if_flag_t;
+
+typedef struct
+{
+  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
+  clib_spinlock_t lockp;
+  u32 flags;
+  memif_interface_id_t id;
+  u32 hw_if_index;
+  u32 sw_if_index;
+  uword dev_instance;
+  memif_interface_mode_t mode:8;
+
+  u32 per_interface_next_index;
+
+  /* socket connection */
+  uword socket_file_index;
+  int conn_fd;
+  uword conn_unix_file_index;
+  memif_msg_fifo_elt_t *msg_queue;
+  u8 *secret;
+
+  memif_region_t *regions;
+
+  memif_queue_t *rx_queues;
+  memif_queue_t *tx_queues;
+
+  /* remote info */
+  pid_t remote_pid;
+  uid_t remote_uid;
+  gid_t remote_gid;
+  u8 *remote_name;
+  u8 *remote_if_name;
+
+  struct
+  {
+    u8 log2_ring_size;
+    u8 num_s2m_rings;
+    u8 num_m2s_rings;
+    u16 buffer_size;
+  } cfg;
+
+  struct
+  {
+    u8 log2_ring_size;
+    u8 num_s2m_rings;
+    u8 num_m2s_rings;
+    u16 buffer_size;
+  } run;
+
+  /* disconnect strings */
+  u8 *local_disc_string;
+  u8 *remote_disc_string;
+} memif_if_t;
+
+typedef struct
+{
+  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
+
+  /** API message ID base */
+  u16 msg_id_base;
+
+  /* pool of all memory interfaces */
+  memif_if_t *interfaces;
+
+  /* pool of all unix socket files */
+  memif_socket_file_t *socket_files;
+  mhash_t socket_file_index_by_filename;
+
+  /* rx buffer cache */
+  u32 **rx_buffers;
+
+} memif_main_t;
+
+extern memif_main_t memif_main;
+extern vnet_device_class_t memif_device_class;
+extern vlib_node_registration_t memif_input_node;
+
+enum
+{
+  MEMIF_PROCESS_EVENT_START = 1,
+  MEMIF_PROCESS_EVENT_STOP = 2,
+} memif_process_event_t;
+
+typedef struct
+{
+  memif_interface_id_t id;
+  u8 *socket_filename;
+  u8 *secret;
+  u8 is_master;
+  memif_interface_mode_t mode:8;
+  u8 log2_ring_size;
+  u16 buffer_size;
+  u8 hw_addr_set;
+  u8 hw_addr[6];
+  u8 rx_queues;
+  u8 tx_queues;
+
+  /* return */
+  u32 sw_if_index;
+} memif_create_if_args_t;
+
+int memif_create_if (vlib_main_t * vm, memif_create_if_args_t * args);
+int memif_delete_if (vlib_main_t * vm, memif_if_t * mif);
+clib_error_t *memif_plugin_api_hookup (vlib_main_t * vm);
+
+#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
+
+static inline int
+memfd_create (const char *name, unsigned int flags)
+{
+  return syscall (__NR_memfd_create, name, flags);
+}
+
+static_always_inline void *
+memif_get_buffer (memif_if_t * mif, memif_ring_t * ring, u16 slot)
+{
+  u16 region = ring->desc[slot].region;
+  return mif->regions[region].shm + ring->desc[slot].offset;
+}
+
+#ifndef F_LINUX_SPECIFIC_BASE
+#define F_LINUX_SPECIFIC_BASE 1024
+#endif
+#define MFD_ALLOW_SEALING       0x0002U
+#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 */
+
+/* memif.c */
+clib_error_t *memif_init_regions_and_queues (memif_if_t * mif);
+clib_error_t *memif_connect (memif_if_t * mif);
+void memif_disconnect (memif_if_t * mif, clib_error_t * err);
+
+/* socket.c */
+clib_error_t *memif_conn_fd_accept_ready (unix_file_t * uf);
+clib_error_t *memif_master_conn_fd_read_ready (unix_file_t * uf);
+clib_error_t *memif_slave_conn_fd_read_ready (unix_file_t * uf);
+clib_error_t *memif_master_conn_fd_write_ready (unix_file_t * uf);
+clib_error_t *memif_slave_conn_fd_write_ready (unix_file_t * uf);
+clib_error_t *memif_master_conn_fd_error (unix_file_t * uf);
+clib_error_t *memif_slave_conn_fd_error (unix_file_t * uf);
+clib_error_t *memif_msg_send_disconnect (memif_if_t * mif,
+					 clib_error_t * err);
+u8 *format_memif_device_name (u8 * s, va_list * args);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/memif/socket.c b/src/plugins/memif/socket.c
new file mode 100644
index 00000000..d1a96db3
--- /dev/null
+++ b/src/plugins/memif/socket.c
@@ -0,0 +1,736 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <net/if.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/uio.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <sys/eventfd.h>
+#include <inttypes.h>
+#include <limits.h>
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vnet/plugin/plugin.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vpp/app/version.h>
+
+#include <memif/memif.h>
+#include <memif/private.h>
+
+static u8 *
+memif_str2vec (uint8_t * str, int len)
+{
+  u8 *s = 0;
+  int i;
+
+  if (str[0] == 0)
+    return s;
+
+  for (i = 0; i < len; i++)
+    {
+      vec_add1 (s, str[i]);
+      if (str[i] == 0)
+	return s;
+    }
+  vec_add1 (s, 0);
+
+  return s;
+}
+
+static clib_error_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))];
+  int rv;
+
+  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;
+      memcpy (CMSG_DATA (cmsg), &afd, sizeof (int));
+    }
+  rv = sendmsg (fd, &mh, 0);
+  if (rv < 0)
+    return clib_error_return_unix (0, "sendmsg");
+  DBG ("Message type %u sent (fd %d)", msg->type, afd);
+  return 0;
+}
+
+static void
+memif_msg_enq_ack (memif_if_t * mif)
+{
+  memif_msg_fifo_elt_t *e;
+  clib_fifo_add2 (mif->msg_queue, e);
+
+  e->msg.type = MEMIF_MSG_TYPE_ACK;
+  e->fd = -1;
+}
+
+static clib_error_t *
+memif_msg_enq_hello (int fd)
+{
+  u8 *s;
+  memif_msg_t msg = { 0 };
+  memif_msg_hello_t *h = &msg.hello;
+  msg.type = MEMIF_MSG_TYPE_HELLO;
+  h->min_version = MEMIF_VERSION;
+  h->max_version = MEMIF_VERSION;
+  h->max_m2s_ring = MEMIF_MAX_M2S_RING;
+  h->max_s2m_ring = MEMIF_MAX_M2S_RING;
+  h->max_region = MEMIF_MAX_REGION;
+  h->max_log2_ring_size = MEMIF_MAX_LOG2_RING_SIZE;
+  s = format (0, "VPP %s%c", VPP_BUILD_VER, 0);
+  strncpy ((char *) h->name, (char *) s, sizeof (h->name));
+  vec_free (s);
+  return memif_msg_send (fd, &msg, -1);
+}
+
+static void
+memif_msg_enq_init (memif_if_t * mif)
+{
+  u8 *s;
+  memif_msg_fifo_elt_t *e;
+  clib_fifo_add2 (mif->msg_queue, e);
+  memif_msg_init_t *i = &e->msg.init;
+
+  e->msg.type = MEMIF_MSG_TYPE_INIT;
+  e->fd = -1;
+  i->version = MEMIF_VERSION;
+  i->id = mif->id;
+  s = format (0, "VPP %s%c", VPP_BUILD_VER, 0);
+  strncpy ((char *) i->name, (char *) s, sizeof (i->name));
+  if (mif->secret)
+    strncpy ((char *) i->secret, (char *) mif->secret, sizeof (i->secret));
+  vec_free (s);
+}
+
+static void
+memif_msg_enq_add_region (memif_if_t * mif, u8 region)
+{
+  memif_msg_fifo_elt_t *e;
+  clib_fifo_add2 (mif->msg_queue, e);
+  memif_msg_add_region_t *ar = &e->msg.add_region;
+
+  e->msg.type = MEMIF_MSG_TYPE_ADD_REGION;
+  e->fd = mif->regions[region].fd;
+  ar->index = region;
+  ar->size = mif->regions[region].region_size;
+}
+
+static void
+memif_msg_enq_add_ring (memif_if_t * mif, u8 index, u8 direction)
+{
+  memif_msg_fifo_elt_t *e;
+  clib_fifo_add2 (mif->msg_queue, e);
+  memif_msg_add_ring_t *ar = &e->msg.add_ring;
+  memif_queue_t *mq;
+
+  ASSERT ((mif->flags & MEMIF_IF_FLAG_IS_SLAVE) != 0);
+
+  e->msg.type = MEMIF_MSG_TYPE_ADD_RING;
+
+  if (direction == MEMIF_RING_M2S)
+    mq = vec_elt_at_index (mif->rx_queues, index);
+  else
+    mq = vec_elt_at_index (mif->tx_queues, index);
+
+  e->fd = mq->int_fd;
+  ar->index = index;
+  ar->region = mq->region;
+  ar->offset = mq->offset;
+  ar->log2_ring_size = mq->log2_ring_size;
+  ar->flags = (direction == MEMIF_RING_S2M) ? MEMIF_MSG_ADD_RING_FLAG_S2M : 0;
+}
+
+static void
+memif_msg_enq_connect (memif_if_t * mif)
+{
+  memif_msg_fifo_elt_t *e;
+  clib_fifo_add2 (mif->msg_queue, e);
+  memif_msg_connect_t *c = &e->msg.connect;
+  u8 *s;
+
+  e->msg.type = MEMIF_MSG_TYPE_CONNECT;
+  e->fd = -1;
+  s = format (0, "%U%c", format_memif_device_name, mif->dev_instance, 0);
+  strncpy ((char *) c->if_name, (char *) s, sizeof (c->if_name));
+  vec_free (s);
+}
+
+static void
+memif_msg_enq_connected (memif_if_t * mif)
+{
+  memif_msg_fifo_elt_t *e;
+  clib_fifo_add2 (mif->msg_queue, e);
+  memif_msg_connected_t *c = &e->msg.connected;
+  u8 *s;
+
+  e->msg.type = MEMIF_MSG_TYPE_CONNECTED;
+  e->fd = -1;
+  s = format (0, "%U%c", format_memif_device_name, mif->dev_instance, 0);
+  strncpy ((char *) c->if_name, (char *) s, sizeof (c->if_name));
+  vec_free (s);
+}
+
+clib_error_t *
+memif_msg_send_disconnect (memif_if_t * mif, clib_error_t * err)
+{
+  memif_msg_t msg = { 0 };
+  msg.type = MEMIF_MSG_TYPE_DISCONNECT;
+  memif_msg_disconnect_t *d = &msg.disconnect;
+
+  d->code = err->code;
+  strncpy ((char *) d->string, (char *) err->what, sizeof (d->string));
+
+  return memif_msg_send (mif->conn_fd, &msg, -1);
+}
+
+static clib_error_t *
+memif_msg_receive_hello (memif_if_t * mif, memif_msg_t * msg)
+{
+  memif_msg_hello_t *h = &msg->hello;
+
+  if (msg->hello.min_version > MEMIF_VERSION ||
+      msg->hello.max_version < MEMIF_VERSION)
+    return clib_error_return (0, "incompatible protocol version");
+
+  mif->run.num_s2m_rings = clib_min (h->max_s2m_ring + 1,
+				     mif->cfg.num_s2m_rings);
+  mif->run.num_m2s_rings = clib_min (h->max_m2s_ring + 1,
+				     mif->cfg.num_m2s_rings);
+  mif->run.log2_ring_size = clib_min (h->max_log2_ring_size,
+				      mif->cfg.log2_ring_size);
+  mif->run.buffer_size = mif->cfg.buffer_size;
+
+  mif->remote_name = memif_str2vec (h->name, sizeof (h->name));
+
+  return 0;
+}
+
+static clib_error_t *
+memif_msg_receive_init (memif_if_t ** mifp, memif_msg_t * msg,
+			unix_file_t * uf)
+{
+  memif_main_t *mm = &memif_main;
+  memif_socket_file_t *msf =
+    vec_elt_at_index (mm->socket_files, uf->private_data);
+  memif_msg_init_t *i = &msg->init;
+  memif_if_t *mif, tmp;
+  clib_error_t *err;
+  uword *p;
+
+  if (i->version != MEMIF_VERSION)
+    {
+      memif_file_del_by_index (uf - unix_main.file_pool);
+      return clib_error_return (0, "unsupported version");
+    }
+
+  p = mhash_get (&msf->dev_instance_by_id, &i->id);
+
+  if (!p)
+    {
+      err = clib_error_return (0, "unmatched interface id");
+      goto error;
+    }
+
+  mif = vec_elt_at_index (mm->interfaces, p[0]);
+
+  if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
+    {
+      err = clib_error_return (0, "cannot connect to slave");
+      goto error;
+    }
+
+  if (mif->conn_fd != -1)
+    {
+      err = clib_error_return (0, "already connected");
+      goto error;
+    }
+
+  if (i->mode != mif->mode)
+    {
+      err = clib_error_return (0, "mode mismatch");
+      goto error;
+    }
+
+  mif->conn_fd = uf->file_descriptor;
+  mif->conn_unix_file_index = uf - unix_main.file_pool;
+  hash_set (msf->dev_instance_by_fd, mif->conn_fd, mif->dev_instance);
+  mif->remote_name = memif_str2vec (i->name, sizeof (i->name));
+  *mifp = mif;
+
+  if (mif->secret)
+    {
+      u8 *s;
+      int r;
+      s = memif_str2vec (i->secret, sizeof (i->secret));
+      if (s == 0)
+	return clib_error_return (0, "secret required");
+
+      r = vec_cmp (s, mif->secret);
+      vec_free (s);
+
+      if (r)
+	return clib_error_return (0, "incorrect secret");
+    }
+
+  return 0;
+
+error:
+  tmp.conn_fd = uf->file_descriptor;
+  memif_msg_send_disconnect (&tmp, err);
+  memif_file_del_by_index (uf - unix_main.file_pool);
+  return err;
+}
+
+static clib_error_t *
+memif_msg_receive_add_region (memif_if_t * mif, memif_msg_t * msg, int fd)
+{
+  memif_msg_add_region_t *ar = &msg->add_region;
+  memif_region_t *mr;
+  if (fd < 0)
+    return clib_error_return (0, "missing memory region fd");
+
+  if (ar->index != vec_len (mif->regions))
+    return clib_error_return (0, "unexpected region index");
+
+  if (ar->index > MEMIF_MAX_REGION)
+    return clib_error_return (0, "too many regions");
+
+  vec_validate_aligned (mif->regions, ar->index, CLIB_CACHE_LINE_BYTES);
+  mr = vec_elt_at_index (mif->regions, ar->index);
+  mr->fd = fd;
+  mr->region_size = ar->size;
+
+  return 0;
+}
+
+static clib_error_t *
+memif_msg_receive_add_ring (memif_if_t * mif, memif_msg_t * msg, int fd)
+{
+  memif_msg_add_ring_t *ar = &msg->add_ring;
+  memif_queue_t *mq;
+
+  if (fd < 0)
+    return clib_error_return (0, "missing ring interrupt fd");
+
+  if (ar->flags & MEMIF_MSG_ADD_RING_FLAG_S2M)
+    {
+      if (ar->index != vec_len (mif->rx_queues))
+	return clib_error_return (0, "unexpected ring index");
+
+      if (ar->index > MEMIF_MAX_S2M_RING)
+	return clib_error_return (0, "too many rings");
+
+      vec_validate_aligned (mif->rx_queues, ar->index, CLIB_CACHE_LINE_BYTES);
+      mq = vec_elt_at_index (mif->rx_queues, ar->index);
+      mif->run.num_s2m_rings = vec_len (mif->rx_queues);
+    }
+  else
+    {
+      if (ar->index != vec_len (mif->tx_queues))
+	return clib_error_return (0, "unexpected ring index");
+
+      if (ar->index > MEMIF_MAX_M2S_RING)
+	return clib_error_return (0, "too many rings");
+
+      vec_validate_aligned (mif->tx_queues, ar->index, CLIB_CACHE_LINE_BYTES);
+      mq = vec_elt_at_index (mif->tx_queues, ar->index);
+      mif->run.num_m2s_rings = vec_len (mif->tx_queues);
+    }
+
+  mq->int_fd = fd;
+  mq->int_unix_file_index = ~0;
+  mq->log2_ring_size = ar->log2_ring_size;
+  mq->region = ar->region;
+  mq->offset = ar->offset;
+
+  return 0;
+}
+
+static clib_error_t *
+memif_msg_receive_connect (memif_if_t * mif, memif_msg_t * msg)
+{
+  clib_error_t *err;
+  memif_msg_connect_t *c = &msg->connect;
+
+  if ((err = memif_connect (mif)))
+    return err;
+
+  mif->remote_if_name = memif_str2vec (c->if_name, sizeof (c->if_name));
+
+  return 0;
+}
+
+static clib_error_t *
+memif_msg_receive_connected (memif_if_t * mif, memif_msg_t * msg)
+{
+  clib_error_t *err;
+  memif_msg_connected_t *c = &msg->connected;
+
+  if ((err = memif_connect (mif)))
+    return err;
+
+  mif->remote_if_name = memif_str2vec (c->if_name, sizeof (c->if_name));
+  return 0;
+}
+
+static clib_error_t *
+memif_msg_receive_disconnect (memif_if_t * mif, memif_msg_t * msg)
+{
+  memif_msg_disconnect_t *d = &msg->disconnect;
+
+  mif->remote_disc_string = memif_str2vec (d->string, sizeof (d->string));
+  return clib_error_return (0, "disconnect received");
+}
+
+static clib_error_t *
+memif_msg_receive (memif_if_t ** mifp, unix_file_t * uf)
+{
+  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;
+  clib_error_t *err = 0;
+  int fd = -1;
+  int i;
+  memif_if_t *mif = *mifp;
+
+  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);
+
+  /* receive the incoming message */
+  size = recvmsg (uf->file_descriptor, &mh, 0);
+  if (size != sizeof (memif_msg_t))
+    {
+      return (size == 0) ? clib_error_return (0, "disconnected") :
+	clib_error_return_unix (0,
+				"recvmsg: malformed message received on fd %d",
+				uf->file_descriptor);
+    }
+
+  if (mif == 0 && msg.type != MEMIF_MSG_TYPE_INIT)
+    {
+      memif_file_del (uf);
+      return clib_error_return (0, "unexpected message received");
+    }
+
+  /* process anciliary data */
+  struct ucred *cr = 0;
+  struct cmsghdr *cmsg;
+
+  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)
+	    {
+	      int *fdp = (int *) CMSG_DATA (cmsg);
+	      fd = *fdp;
+	    }
+	}
+      cmsg = CMSG_NXTHDR (&mh, cmsg);
+    }
+
+  DBG ("Message type %u received", msg.type);
+  /* process the message based on its type */
+  switch (msg.type)
+    {
+    case MEMIF_MSG_TYPE_ACK:
+      break;
+
+    case MEMIF_MSG_TYPE_HELLO:
+      if ((err = memif_msg_receive_hello (mif, &msg)))
+	return err;
+      if ((err = memif_init_regions_and_queues (mif)))
+	return err;
+      memif_msg_enq_init (mif);
+      memif_msg_enq_add_region (mif, 0);
+      vec_foreach_index (i, mif->tx_queues)
+	memif_msg_enq_add_ring (mif, i, MEMIF_RING_S2M);
+      vec_foreach_index (i, mif->rx_queues)
+	memif_msg_enq_add_ring (mif, i, MEMIF_RING_M2S);
+      memif_msg_enq_connect (mif);
+      break;
+
+    case MEMIF_MSG_TYPE_INIT:
+      if ((err = memif_msg_receive_init (mifp, &msg, uf)))
+	return err;
+      mif = *mifp;
+      mif->remote_pid = cr->pid;
+      mif->remote_uid = cr->uid;
+      mif->remote_gid = cr->gid;
+      memif_msg_enq_ack (mif);
+      break;
+
+    case MEMIF_MSG_TYPE_ADD_REGION:
+      if ((err = memif_msg_receive_add_region (mif, &msg, fd)))
+	return err;
+      memif_msg_enq_ack (mif);
+      break;
+
+    case MEMIF_MSG_TYPE_ADD_RING:
+      if ((err = memif_msg_receive_add_ring (mif, &msg, fd)))
+	return err;
+      memif_msg_enq_ack (mif);
+      break;
+
+    case MEMIF_MSG_TYPE_CONNECT:
+      if ((err = memif_msg_receive_connect (mif, &msg)))
+	return err;
+      memif_msg_enq_connected (mif);
+      break;
+
+    case MEMIF_MSG_TYPE_CONNECTED:
+      if ((err = memif_msg_receive_connected (mif, &msg)))
+	return err;
+      break;
+
+    case MEMIF_MSG_TYPE_DISCONNECT:
+      if ((err = memif_msg_receive_disconnect (mif, &msg)))
+	return err;
+      break;
+
+    default:
+      err = clib_error_return (0, "unknown message type (0x%x)", msg.type);
+      return err;
+    }
+
+  if (clib_fifo_elts (mif->msg_queue) && mif->conn_unix_file_index != ~0)
+    unix_file_set_data_available_to_write (mif->conn_unix_file_index, 1);
+  return 0;
+}
+
+clib_error_t *
+memif_master_conn_fd_read_ready (unix_file_t * uf)
+{
+  memif_main_t *mm = &memif_main;
+  memif_socket_file_t *msf =
+    pool_elt_at_index (mm->socket_files, uf->private_data);
+  uword *p;
+  memif_if_t *mif = 0;
+  uword conn_unix_file_index = ~0;
+  clib_error_t *err = 0;
+
+  p = hash_get (msf->dev_instance_by_fd, uf->file_descriptor);
+  if (p)
+    {
+      mif = vec_elt_at_index (mm->interfaces, p[0]);
+    }
+  else
+    {
+      /* This is new connection, remove index from pending vector */
+      int i;
+      vec_foreach_index (i, msf->pending_file_indices)
+	if (msf->pending_file_indices[i] == uf - unix_main.file_pool)
+	{
+	  conn_unix_file_index = msf->pending_file_indices[i];
+	  vec_del1 (msf->pending_file_indices, i);
+	  break;
+	}
+      ASSERT (conn_unix_file_index != ~0);
+    }
+  err = memif_msg_receive (&mif, uf);
+  if (err)
+    {
+      memif_disconnect (mif, err);
+      clib_error_free (err);
+    }
+  return 0;
+}
+
+clib_error_t *
+memif_slave_conn_fd_read_ready (unix_file_t * uf)
+{
+  memif_main_t *mm = &memif_main;
+  clib_error_t *err;
+  memif_if_t *mif = vec_elt_at_index (mm->interfaces, uf->private_data);
+  err = memif_msg_receive (&mif, uf);
+  if (err)
+    {
+      memif_disconnect (mif, err);
+      clib_error_free (err);
+    }
+  return 0;
+}
+
+static clib_error_t *
+memif_conn_fd_write_ready (unix_file_t * uf, memif_if_t * mif)
+{
+  memif_msg_fifo_elt_t *e;
+  clib_fifo_sub2 (mif->msg_queue, e);
+  unix_file_set_data_available_to_write (mif->conn_unix_file_index, 0);
+  memif_msg_send (mif->conn_fd, &e->msg, e->fd);
+  return 0;
+}
+
+clib_error_t *
+memif_master_conn_fd_write_ready (unix_file_t * uf)
+{
+  memif_main_t *mm = &memif_main;
+  memif_socket_file_t *msf =
+    pool_elt_at_index (mm->socket_files, uf->private_data);
+  uword *p;
+  memif_if_t *mif;
+
+  p = hash_get (msf->dev_instance_by_fd, uf->file_descriptor);
+  if (!p)
+    return 0;
+
+  mif = vec_elt_at_index (mm->interfaces, p[0]);
+  return memif_conn_fd_write_ready (uf, mif);
+}
+
+clib_error_t *
+memif_slave_conn_fd_write_ready (unix_file_t * uf)
+{
+  memif_main_t *mm = &memif_main;
+  memif_if_t *mif = vec_elt_at_index (mm->interfaces, uf->private_data);
+  return memif_conn_fd_write_ready (uf, mif);
+}
+
+clib_error_t *
+memif_slave_conn_fd_error (unix_file_t * uf)
+{
+  memif_main_t *mm = &memif_main;
+  memif_if_t *mif = vec_elt_at_index (mm->interfaces, uf->private_data);
+  clib_error_t *err;
+
+  err = clib_error_return (0, "connection fd error");
+  memif_disconnect (mif, err);
+  clib_error_free (err);
+
+  return 0;
+}
+
+clib_error_t *
+memif_master_conn_fd_error (unix_file_t * uf)
+{
+  memif_main_t *mm = &memif_main;
+  memif_socket_file_t *msf =
+    pool_elt_at_index (mm->socket_files, uf->private_data);
+  uword *p;
+
+
+  p = hash_get (msf->dev_instance_by_fd, uf->file_descriptor);
+  if (p)
+    {
+      memif_if_t *mif;
+      clib_error_t *err;
+      mif = vec_elt_at_index (mm->interfaces, p[0]);
+      err = clib_error_return (0, "connection fd error");
+      memif_disconnect (mif, err);
+      clib_error_free (err);
+    }
+  else
+    {
+      int i;
+      vec_foreach_index (i, msf->pending_file_indices)
+	if (msf->pending_file_indices[i] == uf - unix_main.file_pool)
+	{
+	  vec_del1 (msf->pending_file_indices, i);
+	  memif_file_del (uf);
+	  return 0;
+	}
+    }
+
+  clib_warning ("Error on unknown file descriptor %d", uf->file_descriptor);
+  memif_file_del (uf);
+  return 0;
+}
+
+
+clib_error_t *
+memif_conn_fd_accept_ready (unix_file_t * uf)
+{
+  memif_main_t *mm = &memif_main;
+  memif_socket_file_t *msf =
+    pool_elt_at_index (mm->socket_files, uf->private_data);
+  int addr_len;
+  struct sockaddr_un client;
+  int conn_fd;
+  unix_file_t template = { 0 };
+  uword unix_file_index = ~0;
+  clib_error_t *err;
+
+
+  addr_len = sizeof (client);
+  conn_fd = accept (uf->file_descriptor,
+		    (struct sockaddr *) &client, (socklen_t *) & addr_len);
+
+  if (conn_fd < 0)
+    return clib_error_return_unix (0, "accept fd %d", uf->file_descriptor);
+
+  template.read_function = memif_master_conn_fd_read_ready;
+  template.write_function = memif_master_conn_fd_write_ready;
+  template.error_function = memif_master_conn_fd_error;
+  template.file_descriptor = conn_fd;
+  template.private_data = uf->private_data;
+
+  memif_file_add (&unix_file_index, &template);
+
+  err = memif_msg_enq_hello (conn_fd);
+  if (err)
+    {
+      clib_error_report (err);
+      memif_file_del_by_index (unix_file_index);
+    }
+  else
+    vec_add1 (msf->pending_file_indices, unix_file_index);
+
+  return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */