src/vnet/interface.h - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2015 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.
  */
 /*
  * interface.h: VNET interfaces/sub-interfaces
  *
  * Copyright (c) 2008 Eliot Dresselhaus
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sublicense, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice shall be
  * included in all copies or substantial portions of the Software.
  *
  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */

 #ifndef included_vnet_interface_h
 #define included_vnet_interface_h

 #include <vnet/unix/pcap.h>
 #include <vnet/l3_types.h>

 struct vnet_main_t;
 struct vnet_hw_interface_t;
 struct vnet_sw_interface_t;
 struct ip46_address_t;

 /* Interface up/down callback. */
 typedef clib_error_t *(vnet_interface_function_t)
   (struct vnet_main_t * vnm, u32 if_index, u32 flags);

 /* Sub-interface add/del callback. */
 typedef clib_error_t *(vnet_subif_add_del_function_t)
   (struct vnet_main_t * vnm, u32 if_index,
    struct vnet_sw_interface_t * template, int is_add);

 /* Interface set mac address callback. */
 typedef clib_error_t *(vnet_interface_set_mac_address_function_t)
   (struct vnet_hw_interface_t * hi, char *address);

 typedef enum vnet_interface_function_priority_t_
 {
   VNET_ITF_FUNC_PRIORITY_LOW,
   VNET_ITF_FUNC_PRIORITY_HIGH,
 } vnet_interface_function_priority_t;
 #define VNET_ITF_FUNC_N_PRIO ((vnet_interface_function_priority_t)VNET_ITF_FUNC_PRIORITY_HIGH+1)

 typedef struct _vnet_interface_function_list_elt
 {
   struct _vnet_interface_function_list_elt *next_interface_function;
   clib_error_t *(*fp) (struct vnet_main_t * vnm, u32 if_index, u32 flags);
 } _vnet_interface_function_list_elt_t;

 #define _VNET_INTERFACE_FUNCTION_DECL(f,tag)                            \
                                                                         \
 static void __vnet_interface_function_init_##tag##_##f (void)           \
     __attribute__((__constructor__)) ;                                  \
                                                                         \
 static void __vnet_interface_function_init_##tag##_##f (void)           \
 {                                                                       \
  vnet_main_t * vnm = vnet_get_main();                                   \
  static _vnet_interface_function_list_elt_t init_function;              \
  init_function.next_interface_function =                                \
    vnm->tag##_functions[VNET_ITF_FUNC_PRIORITY_LOW];                    \
  vnm->tag##_functions[VNET_ITF_FUNC_PRIORITY_LOW] = &init_function;     \
  init_function.fp = (void *) &f;                                        \
 }

 #define _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,tag,p)                    \
                                                                         \
 static void __vnet_interface_function_init_##tag##_##f (void)           \
     __attribute__((__constructor__)) ;                                  \
                                                                         \
 static void __vnet_interface_function_init_##tag##_##f (void)           \
 {                                                                       \
  vnet_main_t * vnm = vnet_get_main();                                   \
  static _vnet_interface_function_list_elt_t init_function;              \
  init_function.next_interface_function = vnm->tag##_functions[p];       \
  vnm->tag##_functions[p] = &init_function;                              \
  init_function.fp = (void *) &f;                                        \
 }

 #define VNET_HW_INTERFACE_ADD_DEL_FUNCTION(f)			\
   _VNET_INTERFACE_FUNCTION_DECL(f,hw_interface_add_del)
 #define VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(f)		\
   _VNET_INTERFACE_FUNCTION_DECL(f,hw_interface_link_up_down)
 #define VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION_PRIO(f,p)        \
   _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,hw_interface_link_up_down,p)
 #define VNET_SW_INTERFACE_ADD_DEL_FUNCTION(f)			\
   _VNET_INTERFACE_FUNCTION_DECL(f,sw_interface_add_del)
 #define VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(f)		\
   _VNET_INTERFACE_FUNCTION_DECL(f,sw_interface_admin_up_down)
 #define VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION_PRIO(f,p)     	\
   _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,sw_interface_admin_up_down, p)

 /* A class of hardware interface devices. */
 typedef struct _vnet_device_class
 {
   /* Index into main vector. */
   u32 index;

   /* Device name (e.g. "FOOBAR 1234a"). */
   char *name;

   /* Function to call when hardware interface is added/deleted. */
   vnet_interface_function_t *interface_add_del_function;

   /* Function to bring device administratively up/down. */
   vnet_interface_function_t *admin_up_down_function;

   /* Function to call when sub-interface is added/deleted */
   vnet_subif_add_del_function_t *subif_add_del_function;

   /* Redistribute flag changes/existence of this interface class. */
   u32 redistribute;

   /* Transmit function. */
   vlib_node_function_t *tx_function;

   /* Error strings indexed by error code for this node. */
   char **tx_function_error_strings;

   /* Number of error codes used by this node. */
   u32 tx_function_n_errors;

   /* Renumber device name [only!] support, a control-plane kludge */
   int (*name_renumber) (struct vnet_hw_interface_t * hi,
 			u32 new_dev_instance);

   /* Format device instance as name. */
   format_function_t *format_device_name;

   /* Parse function for device name. */
   unformat_function_t *unformat_device_name;

   /* Format device verbosely for this class. */
   format_function_t *format_device;

   /* Trace buffer format for TX function. */
   format_function_t *format_tx_trace;

   /* Function to clear hardware counters for device. */
   void (*clear_counters) (u32 dev_class_instance);

     uword (*is_valid_class_for_interface) (struct vnet_main_t * vnm,
 					   u32 hw_if_index,
 					   u32 hw_class_index);

   /* Called when hardware class of an interface changes. */
   void (*hw_class_change) (struct vnet_main_t * vnm,
 			   u32 hw_if_index, u32 new_hw_class_index);

   /* Called to redirect traffic from a specific interface instance */
   void (*rx_redirect_to_node) (struct vnet_main_t * vnm,
 			       u32 hw_if_index, u32 node_index);

   /* Link-list of all device classes set up by constructors created below */
   struct _vnet_device_class *next_class_registration;

   /* Splice vnet_interface_output_node into TX path */
   u8 flatten_output_chains;

   /* Function to set mac address. */
   vnet_interface_set_mac_address_function_t *mac_addr_change_function;
 } vnet_device_class_t;

 #define VNET_DEVICE_CLASS(x,...)                                        \
   __VA_ARGS__ vnet_device_class_t x;                                    \
 static void __vnet_add_device_class_registration_##x (void)             \
     __attribute__((__constructor__)) ;                                  \
 static void __vnet_add_device_class_registration_##x (void)             \
 {                                                                       \
     vnet_main_t * vnm = vnet_get_main();                                \
     x.next_class_registration = vnm->device_class_registrations;        \
     vnm->device_class_registrations = &x;                               \
 }                                                                       \
 __VA_ARGS__ vnet_device_class_t x

 #define VLIB_DEVICE_TX_FUNCTION_CLONE_TEMPLATE(arch, fn, tgt)		\
   uword									\
   __attribute__ ((flatten))						\
   __attribute__ ((target (tgt)))					\
   CLIB_CPU_OPTIMIZED							\
   fn ## _ ## arch ( vlib_main_t * vm,					\
                    vlib_node_runtime_t * node,				\
                    vlib_frame_t * frame)				\
   { return fn (vm, node, frame); }

 #define VLIB_DEVICE_TX_FUNCTION_MULTIARCH_CLONE(fn)			\
   foreach_march_variant(VLIB_DEVICE_TX_FUNCTION_CLONE_TEMPLATE, fn)

 #if CLIB_DEBUG > 0
 #define VLIB_MULTIARCH_CLONE_AND_SELECT_FN(fn,...)
 #define VLIB_DEVICE_TX_FUNCTION_MULTIARCH(dev, fn)
 #else
 #define VLIB_DEVICE_TX_FUNCTION_MULTIARCH(dev, fn)			\
   VLIB_DEVICE_TX_FUNCTION_MULTIARCH_CLONE(fn)				\
   CLIB_MULTIARCH_SELECT_FN(fn, static inline)				\
   static void __attribute__((__constructor__))				\
   __vlib_device_tx_function_multiarch_select_##dev (void)		\
   { dev.tx_function = fn ## _multiarch_select(); }
 #endif

 /**
  * Link Type: A description of the protocol of packets on the link.
  * On an ethernet link this maps directly into the ethertype. On a GRE tunnel
  * it maps to the GRE-proto, etc for other lnk types.
  */
 typedef enum vnet_link_t_
 {
 #if CLIB_DEBUG > 0
   VNET_LINK_IP4 = 1,
 #else
   VNET_LINK_IP4 = 0,
 #endif
   VNET_LINK_IP6,
   VNET_LINK_MPLS,
   VNET_LINK_ETHERNET,
   VNET_LINK_ARP,
   VNET_LINK_NSH,
 } __attribute__ ((packed)) vnet_link_t;

 #define VNET_LINKS {                   \
     [VNET_LINK_ETHERNET] = "ethernet", \
     [VNET_LINK_IP4] = "ipv4",          \
     [VNET_LINK_IP6] = "ipv6",          \
     [VNET_LINK_MPLS] = "mpls",         \
     [VNET_LINK_ARP] = "arp",	       \
     [VNET_LINK_NSH] = "nsh",           \
 }

 /**
  * @brief Number of link types. Not part of the enum so it does not have to be included in
  * switch statements
  */
 #define VNET_LINK_NUM (VNET_LINK_NSH+1)

 /**
  * @brief Convert a link to to an Ethertype
  */
 extern vnet_l3_packet_type_t vnet_link_to_l3_proto (vnet_link_t link);

 /**
  * @brief Attributes assignable to a HW interface Class.
  */
 typedef enum vnet_hw_interface_class_flags_t_
 {
   /**
    * @brief a point 2 point interface
    */
   VNET_HW_INTERFACE_CLASS_FLAG_P2P = (1 << 0),
 } vnet_hw_interface_class_flags_t;

 /* Layer-2 (e.g. Ethernet) interface class. */
 typedef struct _vnet_hw_interface_class
 {
   /* Index into main vector. */
   u32 index;

   /* Class name (e.g. "Ethernet"). */
   char *name;

   /* Flags */
   vnet_hw_interface_class_flags_t flags;

   /* Function to call when hardware interface is added/deleted. */
   vnet_interface_function_t *interface_add_del_function;

   /* Function to bring interface administratively up/down. */
   vnet_interface_function_t *admin_up_down_function;

   /* Function to call when link state changes. */
   vnet_interface_function_t *link_up_down_function;

   /* Function to call when link MAC changes. */
   vnet_interface_set_mac_address_function_t *mac_addr_change_function;

   /* Format function to display interface name. */
   format_function_t *format_interface_name;

   /* Format function to display interface address. */
   format_function_t *format_address;

   /* Format packet header for this interface class. */
   format_function_t *format_header;

   /* Format device verbosely for this class. */
   format_function_t *format_device;

   /* Parser for hardware (e.g. ethernet) address. */
   unformat_function_t *unformat_hw_address;

   /* Parser for packet header for e.g. rewrite string. */
   unformat_function_t *unformat_header;

   /* Builds a rewrite string for the interface to the destination
    * for the payload/link type. */
   u8 *(*build_rewrite) (struct vnet_main_t * vnm,
 			u32 sw_if_index,
 			vnet_link_t link_type, const void *dst_hw_address);

   /* Update an adjacecny added by FIB (as opposed to via the
    * neighbour resolution protocol). */
   void (*update_adjacency) (struct vnet_main_t * vnm,
 			    u32 sw_if_index, u32 adj_index);

     uword (*is_valid_class_for_interface) (struct vnet_main_t * vnm,
 					   u32 hw_if_index,
 					   u32 hw_class_index);

   /* Called when hw interface class is changed and old hardware instance
      may want to be deleted. */
   void (*hw_class_change) (struct vnet_main_t * vnm, u32 hw_if_index,
 			   u32 old_class_index, u32 new_class_index);

   /* List of hw interface classes, built by constructors */
   struct _vnet_hw_interface_class *next_class_registration;

 } vnet_hw_interface_class_t;

 /**
  * @brief Return a complete, zero-length (aka dummy) rewrite
  */
 extern u8 *default_build_rewrite (struct vnet_main_t *vnm,
 				  u32 sw_if_index,
 				  vnet_link_t link_type,
 				  const void *dst_hw_address);

 /**
  * @brief Default adjacency update function
  */
 extern void default_update_adjacency (struct vnet_main_t *vnm,
 				      u32 sw_if_index, u32 adj_index);

 #define VNET_HW_INTERFACE_CLASS(x,...)                                  \
   __VA_ARGS__ vnet_hw_interface_class_t x;                              \
 static void __vnet_add_hw_interface_class_registration_##x (void)       \
     __attribute__((__constructor__)) ;                                  \
 static void __vnet_add_hw_interface_class_registration_##x (void)       \
 {                                                                       \
     vnet_main_t * vnm = vnet_get_main();                                \
     x.next_class_registration = vnm->hw_interface_class_registrations;  \
     vnm->hw_interface_class_registrations = &x;                         \
 }                                                                       \
 __VA_ARGS__ vnet_hw_interface_class_t x

 /* Hardware-interface.  This corresponds to a physical wire
    that packets flow over. */
 typedef struct vnet_hw_interface_t
 {
   /* Interface name. */
   u8 *name;

   u32 flags;
   /* Hardware link state is up. */
 #define VNET_HW_INTERFACE_FLAG_LINK_UP		(1 << 0)
   /* Hardware duplex state */
 #define VNET_HW_INTERFACE_FLAG_DUPLEX_SHIFT	1
 #define VNET_HW_INTERFACE_FLAG_HALF_DUPLEX	(1 << 1)
 #define VNET_HW_INTERFACE_FLAG_FULL_DUPLEX	(1 << 2)
 #define VNET_HW_INTERFACE_FLAG_DUPLEX_MASK	\
   (VNET_HW_INTERFACE_FLAG_HALF_DUPLEX |		\
    VNET_HW_INTERFACE_FLAG_FULL_DUPLEX)

   /* Hardware link speed */
 #define VNET_HW_INTERFACE_FLAG_SPEED_SHIFT	3
 #define VNET_HW_INTERFACE_FLAG_SPEED_10M	(1 << 3)
 #define VNET_HW_INTERFACE_FLAG_SPEED_100M	(1 << 4)
 #define VNET_HW_INTERFACE_FLAG_SPEED_1G		(1 << 5)
 #define VNET_HW_INTERFACE_FLAG_SPEED_10G	(1 << 6)
 #define VNET_HW_INTERFACE_FLAG_SPEED_40G	(1 << 7)
 #define VNET_HW_INTERFACE_FLAG_SPEED_100G	(1 << 8)
 #define VNET_HW_INTERFACE_FLAG_SPEED_MASK	\
   (VNET_HW_INTERFACE_FLAG_SPEED_10M |		\
    VNET_HW_INTERFACE_FLAG_SPEED_100M |		\
    VNET_HW_INTERFACE_FLAG_SPEED_1G |		\
    VNET_HW_INTERFACE_FLAG_SPEED_10G |		\
    VNET_HW_INTERFACE_FLAG_SPEED_40G |		\
    VNET_HW_INTERFACE_FLAG_SPEED_100G)

   /* l2output node flags */
 #define VNET_HW_INTERFACE_FLAG_L2OUTPUT_SHIFT	9
 #define VNET_HW_INTERFACE_FLAG_L2OUTPUT_MAPPED	(1 << 9)

   /* Hardware address as vector.  Zero (e.g. zero-length vector) if no
      address for this class (e.g. PPP). */
   u8 *hw_address;

   /* Interface is up as far as software is concerned. */
   /* NAME.{output,tx} nodes for this interface. */
   u32 output_node_index, tx_node_index;

   /* (dev_class, dev_instance) uniquely identifies hw interface. */
   u32 dev_class_index;
   u32 dev_instance;

   /* (hw_class, hw_instance) uniquely identifies hw interface. */
   u32 hw_class_index;
   u32 hw_instance;

   /* Hardware index for this hardware interface. */
   u32 hw_if_index;

   /* Software index for this hardware interface. */
   u32 sw_if_index;

   /* Maximum transmit rate for this interface in bits/sec. */
   f64 max_rate_bits_per_sec;

   /* Smallest packet size supported by this interface. */
   u32 min_supported_packet_bytes;

   /* Largest packet size supported by this interface. */
   u32 max_supported_packet_bytes;

   /* Smallest packet size for this interface. */
   u32 min_packet_bytes;

   /* Largest packet size for this interface. */
   u32 max_packet_bytes;

   /* Number of extra bytes that go on the wire.
      Packet length on wire
      = max (length + per_packet_overhead_bytes, min_packet_bytes). */
   u32 per_packet_overhead_bytes;

   /* Receive and transmit layer 3 packet size limits (MRU/MTU). */
   u32 max_l3_packet_bytes[VLIB_N_RX_TX];

   /* Hash table mapping sub interface id to sw_if_index. */
   uword *sub_interface_sw_if_index_by_id;

   /* Count of number of L2 subinterfaces */
   u32 l2_if_count;

   /* Bonded interface info -
      0       - not a bonded interface nor a slave
      ~0      - slave to a bonded interface
      others  - A bonded interface with a pointer to bitmap for all slaves */
   uword *bond_info;
 #define VNET_HW_INTERFACE_BOND_INFO_NONE ((uword *) 0)
 #define VNET_HW_INTERFACE_BOND_INFO_SLAVE ((uword *) ~0)

   /* Input node */
   u32 input_node_index;

   /* input node cpu index by queue */
   u32 *input_node_cpu_index_by_queue;

 } vnet_hw_interface_t;

 extern vnet_device_class_t vnet_local_interface_device_class;

 typedef enum
 {
   /* A hw interface. */
   VNET_SW_INTERFACE_TYPE_HARDWARE,

   /* A sub-interface. */
   VNET_SW_INTERFACE_TYPE_SUB,
 } vnet_sw_interface_type_t;

 typedef struct
 {
   /*
    * Subinterface ID. A number 0-N to uniquely identify
    * this subinterface under the main (parent?) interface
    */
   u32 id;

   /* Classification data. Used to associate packet header with subinterface. */
   struct
   {
     u16 outer_vlan_id;
     u16 inner_vlan_id;
     union
     {
       u16 raw_flags;
       struct
       {
 	u16 no_tags:1;
 	u16 one_tag:1;
 	u16 two_tags:1;
 	u16 dot1ad:1;		/* 0 = dot1q, 1=dot1ad */
 	u16 exact_match:1;
 	u16 default_sub:1;
 	u16 outer_vlan_id_any:1;
 	u16 inner_vlan_id_any:1;
       } flags;
     };
   } eth;
 } vnet_sub_interface_t;

 typedef enum
 {
   /* Always flood */
   VNET_FLOOD_CLASS_NORMAL,
   VNET_FLOOD_CLASS_TUNNEL_MASTER,
   /* Does not flood when tunnel master is in the same L2 BD */
   VNET_FLOOD_CLASS_TUNNEL_NORMAL
 } vnet_flood_class_t;

 /* Software-interface.  This corresponds to a Ethernet VLAN, ATM vc, a
    tunnel, etc.  Configuration (e.g. IP address) gets attached to
    software interface. */
 typedef struct
 {
   vnet_sw_interface_type_t type:16;

   u16 flags;
   /* Interface is "up" meaning adminstratively up.
      Up in the sense of link state being up is maintained by hardware interface. */
 #define VNET_SW_INTERFACE_FLAG_ADMIN_UP (1 << 0)

   /* Interface is disabled for forwarding: punt all traffic to slow-path. */
 #define VNET_SW_INTERFACE_FLAG_PUNT (1 << 1)

 #define VNET_SW_INTERFACE_FLAG_PROXY_ARP (1 << 2)

 #define VNET_SW_INTERFACE_FLAG_UNNUMBERED (1 << 3)

 #define VNET_SW_INTERFACE_FLAG_BOND_SLAVE (1 << 4)

 /* Interface does not appear in CLI/API */
 #define VNET_SW_INTERFACE_FLAG_HIDDEN (1 << 5)

   /* Index for this interface. */
   u32 sw_if_index;

   /* Software interface index of super-interface;
      equal to sw_if_index if this interface is not a
      sub-interface. */
   u32 sup_sw_if_index;

   /* this swif is unnumbered, use addresses on unnumbered_sw_if_index... */
   u32 unnumbered_sw_if_index;

   u32 link_speed;

   union
   {
     /* VNET_SW_INTERFACE_TYPE_HARDWARE. */
     u32 hw_if_index;

     /* VNET_SW_INTERFACE_TYPE_SUB. */
     vnet_sub_interface_t sub;
   };

   vnet_flood_class_t flood_class;
 } vnet_sw_interface_t;

 typedef enum
 {
   /* Simple counters. */
   VNET_INTERFACE_COUNTER_DROP = 0,
   VNET_INTERFACE_COUNTER_PUNT = 1,
   VNET_INTERFACE_COUNTER_IP4 = 2,
   VNET_INTERFACE_COUNTER_IP6 = 3,
   VNET_INTERFACE_COUNTER_RX_NO_BUF = 4,
   VNET_INTERFACE_COUNTER_RX_MISS = 5,
   VNET_INTERFACE_COUNTER_RX_ERROR = 6,
   VNET_INTERFACE_COUNTER_TX_ERROR = 7,
   VNET_INTERFACE_COUNTER_MPLS = 8,
   VNET_N_SIMPLE_INTERFACE_COUNTER = 9,
   /* Combined counters. */
   VNET_INTERFACE_COUNTER_RX = 0,
   VNET_INTERFACE_COUNTER_TX = 1,
   VNET_N_COMBINED_INTERFACE_COUNTER = 2,
 } vnet_interface_counter_type_t;

 typedef struct
 {
   u32 output_node_index;
   u32 tx_node_index;
 } vnet_hw_interface_nodes_t;

 typedef struct
 {
   /* Hardware interfaces. */
   vnet_hw_interface_t *hw_interfaces;

   /* Hash table mapping HW interface name to index. */
   uword *hw_interface_by_name;

   /* Vectors if hardware interface classes and device classes. */
   vnet_hw_interface_class_t *hw_interface_classes;
   vnet_device_class_t *device_classes;

   /* Hash table mapping name to hw interface/device class. */
   uword *hw_interface_class_by_name;
   uword *device_class_by_name;

   /* Software interfaces. */
   vnet_sw_interface_t *sw_interfaces;

   /* Hash table mapping sub intfc sw_if_index by sup sw_if_index and sub id */
   uword *sw_if_index_by_sup_and_sub;

   /* Software interface counters both simple and combined
      packet and byte counters. */
   volatile u32 *sw_if_counter_lock;
   vlib_simple_counter_main_t *sw_if_counters;
   vlib_combined_counter_main_t *combined_sw_if_counters;

   vnet_hw_interface_nodes_t *deleted_hw_interface_nodes;

   /* pcap drop tracing */
   int drop_pcap_enable;
   pcap_main_t pcap_main;
   u8 *pcap_filename;
   u32 pcap_sw_if_index;
   u32 pcap_pkts_to_capture;
   uword *pcap_drop_filter_hash;

   /* feature_arc_index */
   u8 output_feature_arc_index;
 } vnet_interface_main_t;

 static inline void
 vnet_interface_counter_lock (vnet_interface_main_t * im)
 {
   if (im->sw_if_counter_lock)
     while (__sync_lock_test_and_set (im->sw_if_counter_lock, 1))
       /* zzzz */ ;
 }

 static inline void
 vnet_interface_counter_unlock (vnet_interface_main_t * im)
 {
   if (im->sw_if_counter_lock)
     *im->sw_if_counter_lock = 0;
 }

 void vnet_pcap_drop_trace_filter_add_del (u32 error_index, int is_add);

 int vnet_interface_name_renumber (u32 sw_if_index, u32 new_show_dev_instance);

 #endif /* included_vnet_interface_h */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2015 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.
	*/
	/*
	* interface.h: VNET interfaces/sub-interfaces
	*
	* Copyright (c) 2008 Eliot Dresselhaus
	*
	* Permission is hereby granted, free of charge, to any person obtaining
	* a copy of this software and associated documentation files (the
	* "Software"), to deal in the Software without restriction, including
	* without limitation the rights to use, copy, modify, merge, publish,
	* distribute, sublicense, and/or sell copies of the Software, and to
	* permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice shall be
	* included in all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
	* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	*/

	#ifndef included_vnet_interface_h
	#define included_vnet_interface_h

	#include <vnet/unix/pcap.h>
	#include <vnet/l3_types.h>

	struct vnet_main_t;
	struct vnet_hw_interface_t;
	struct vnet_sw_interface_t;
	struct ip46_address_t;

	/* Interface up/down callback. */
	typedef clib_error_t *(vnet_interface_function_t)
	(struct vnet_main_t * vnm, u32 if_index, u32 flags);

	/* Sub-interface add/del callback. */
	typedef clib_error_t *(vnet_subif_add_del_function_t)
	(struct vnet_main_t * vnm, u32 if_index,
	struct vnet_sw_interface_t * template, int is_add);

	/* Interface set mac address callback. */
	typedef clib_error_t *(vnet_interface_set_mac_address_function_t)
	(struct vnet_hw_interface_t * hi, char *address);

	typedef enum vnet_interface_function_priority_t_
	{
	VNET_ITF_FUNC_PRIORITY_LOW,
	VNET_ITF_FUNC_PRIORITY_HIGH,
	} vnet_interface_function_priority_t;
	#define VNET_ITF_FUNC_N_PRIO ((vnet_interface_function_priority_t)VNET_ITF_FUNC_PRIORITY_HIGH+1)

	typedef struct _vnet_interface_function_list_elt
	{
	struct _vnet_interface_function_list_elt *next_interface_function;
	clib_error_t (fp) (struct vnet_main_t * vnm, u32 if_index, u32 flags);
	} _vnet_interface_function_list_elt_t;

	#define _VNET_INTERFACE_FUNCTION_DECL(f,tag) \
	\
	static void __vnet_interface_function_init_##tag##_##f (void) \
	__attribute__((__constructor__)) ; \
	\
	static void __vnet_interface_function_init_##tag##_##f (void) \
	{ \
	vnet_main_t * vnm = vnet_get_main(); \
	static _vnet_interface_function_list_elt_t init_function; \
	init_function.next_interface_function = \
	vnm->tag##_functions[VNET_ITF_FUNC_PRIORITY_LOW]; \
	vnm->tag##_functions[VNET_ITF_FUNC_PRIORITY_LOW] = &init_function; \
	init_function.fp = (void *) &f; \
	}

	#define _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,tag,p) \
	\
	static void __vnet_interface_function_init_##tag##_##f (void) \
	__attribute__((__constructor__)) ; \
	\
	static void __vnet_interface_function_init_##tag##_##f (void) \
	{ \
	vnet_main_t * vnm = vnet_get_main(); \
	static _vnet_interface_function_list_elt_t init_function; \
	init_function.next_interface_function = vnm->tag##_functions[p]; \
	vnm->tag##_functions[p] = &init_function; \
	init_function.fp = (void *) &f; \
	}

	#define VNET_HW_INTERFACE_ADD_DEL_FUNCTION(f) \
	_VNET_INTERFACE_FUNCTION_DECL(f,hw_interface_add_del)
	#define VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(f) \
	_VNET_INTERFACE_FUNCTION_DECL(f,hw_interface_link_up_down)
	#define VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION_PRIO(f,p) \
	_VNET_INTERFACE_FUNCTION_DECL_PRIO(f,hw_interface_link_up_down,p)
	#define VNET_SW_INTERFACE_ADD_DEL_FUNCTION(f) \
	_VNET_INTERFACE_FUNCTION_DECL(f,sw_interface_add_del)
	#define VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(f) \
	_VNET_INTERFACE_FUNCTION_DECL(f,sw_interface_admin_up_down)
	#define VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION_PRIO(f,p) \
	_VNET_INTERFACE_FUNCTION_DECL_PRIO(f,sw_interface_admin_up_down, p)

	/* A class of hardware interface devices. */
	typedef struct _vnet_device_class
	{
	/* Index into main vector. */
	u32 index;

	/* Device name (e.g. "FOOBAR 1234a"). */
	char *name;

	/* Function to call when hardware interface is added/deleted. */
	vnet_interface_function_t *interface_add_del_function;

	/* Function to bring device administratively up/down. */
	vnet_interface_function_t *admin_up_down_function;

	/* Function to call when sub-interface is added/deleted */
	vnet_subif_add_del_function_t *subif_add_del_function;

	/* Redistribute flag changes/existence of this interface class. */
	u32 redistribute;

	/* Transmit function. */
	vlib_node_function_t *tx_function;

	/* Error strings indexed by error code for this node. */
	char **tx_function_error_strings;

	/* Number of error codes used by this node. */
	u32 tx_function_n_errors;

	/* Renumber device name [only!] support, a control-plane kludge */
	int (name_renumber) (struct vnet_hw_interface_t hi,
	u32 new_dev_instance);

	/* Format device instance as name. */
	format_function_t *format_device_name;

	/* Parse function for device name. */
	unformat_function_t *unformat_device_name;

	/* Format device verbosely for this class. */
	format_function_t *format_device;

	/* Trace buffer format for TX function. */
	format_function_t *format_tx_trace;

	/* Function to clear hardware counters for device. */
	void (*clear_counters) (u32 dev_class_instance);

	uword (is_valid_class_for_interface) (struct vnet_main_t vnm,
	u32 hw_if_index,
	u32 hw_class_index);

	/* Called when hardware class of an interface changes. */
	void (hw_class_change) (struct vnet_main_t vnm,
	u32 hw_if_index, u32 new_hw_class_index);

	/* Called to redirect traffic from a specific interface instance */
	void (rx_redirect_to_node) (struct vnet_main_t vnm,
	u32 hw_if_index, u32 node_index);

	/* Link-list of all device classes set up by constructors created below */
	struct _vnet_device_class *next_class_registration;

	/* Splice vnet_interface_output_node into TX path */
	u8 flatten_output_chains;

	/* Function to set mac address. */
	vnet_interface_set_mac_address_function_t *mac_addr_change_function;
	} vnet_device_class_t;

	#define VNET_DEVICE_CLASS(x,...) \
	__VA_ARGS__ vnet_device_class_t x; \
	static void __vnet_add_device_class_registration_##x (void) \
	__attribute__((__constructor__)) ; \
	static void __vnet_add_device_class_registration_##x (void) \
	{ \
	vnet_main_t * vnm = vnet_get_main(); \
	x.next_class_registration = vnm->device_class_registrations; \
	vnm->device_class_registrations = &x; \
	} \
	__VA_ARGS__ vnet_device_class_t x

	#define VLIB_DEVICE_TX_FUNCTION_CLONE_TEMPLATE(arch, fn, tgt) \
	uword \
	__attribute__ ((flatten)) \
	__attribute__ ((target (tgt))) \
	CLIB_CPU_OPTIMIZED \
	fn ## _ ## arch ( vlib_main_t * vm, \
	vlib_node_runtime_t * node, \
	vlib_frame_t * frame) \
	{ return fn (vm, node, frame); }

	#define VLIB_DEVICE_TX_FUNCTION_MULTIARCH_CLONE(fn) \
	foreach_march_variant(VLIB_DEVICE_TX_FUNCTION_CLONE_TEMPLATE, fn)

	#if CLIB_DEBUG > 0
	#define VLIB_MULTIARCH_CLONE_AND_SELECT_FN(fn,...)
	#define VLIB_DEVICE_TX_FUNCTION_MULTIARCH(dev, fn)
	#else
	#define VLIB_DEVICE_TX_FUNCTION_MULTIARCH(dev, fn) \
	VLIB_DEVICE_TX_FUNCTION_MULTIARCH_CLONE(fn) \
	CLIB_MULTIARCH_SELECT_FN(fn, static inline) \
	static void __attribute__((__constructor__)) \
	__vlib_device_tx_function_multiarch_select_##dev (void) \
	{ dev.tx_function = fn ## _multiarch_select(); }
	#endif

	/**
	* Link Type: A description of the protocol of packets on the link.
	* On an ethernet link this maps directly into the ethertype. On a GRE tunnel
	* it maps to the GRE-proto, etc for other lnk types.
	*/
	typedef enum vnet_link_t_
	{
	#if CLIB_DEBUG > 0
	VNET_LINK_IP4 = 1,
	#else
	VNET_LINK_IP4 = 0,
	#endif
	VNET_LINK_IP6,
	VNET_LINK_MPLS,
	VNET_LINK_ETHERNET,
	VNET_LINK_ARP,
	VNET_LINK_NSH,
	} __attribute__ ((packed)) vnet_link_t;

	#define VNET_LINKS { \
	[VNET_LINK_ETHERNET] = "ethernet", \
	[VNET_LINK_IP4] = "ipv4", \
	[VNET_LINK_IP6] = "ipv6", \
	[VNET_LINK_MPLS] = "mpls", \
	[VNET_LINK_ARP] = "arp", \
	[VNET_LINK_NSH] = "nsh", \
	}

	/**
	* @brief Number of link types. Not part of the enum so it does not have to be included in
	* switch statements
	*/
	#define VNET_LINK_NUM (VNET_LINK_NSH+1)

	/**
	* @brief Convert a link to to an Ethertype
	*/
	extern vnet_l3_packet_type_t vnet_link_to_l3_proto (vnet_link_t link);

	/**
	* @brief Attributes assignable to a HW interface Class.
	*/
	typedef enum vnet_hw_interface_class_flags_t_
	{
	/**
	* @brief a point 2 point interface
	*/
	VNET_HW_INTERFACE_CLASS_FLAG_P2P = (1 << 0),
	} vnet_hw_interface_class_flags_t;

	/* Layer-2 (e.g. Ethernet) interface class. */
	typedef struct _vnet_hw_interface_class
	{
	/* Index into main vector. */
	u32 index;

	/* Class name (e.g. "Ethernet"). */
	char *name;

	/* Flags */
	vnet_hw_interface_class_flags_t flags;

	/* Function to call when hardware interface is added/deleted. */
	vnet_interface_function_t *interface_add_del_function;

	/* Function to bring interface administratively up/down. */
	vnet_interface_function_t *admin_up_down_function;

	/* Function to call when link state changes. */
	vnet_interface_function_t *link_up_down_function;

	/* Function to call when link MAC changes. */
	vnet_interface_set_mac_address_function_t *mac_addr_change_function;

	/* Format function to display interface name. */
	format_function_t *format_interface_name;

	/* Format function to display interface address. */
	format_function_t *format_address;

	/* Format packet header for this interface class. */
	format_function_t *format_header;

	/* Format device verbosely for this class. */
	format_function_t *format_device;

	/* Parser for hardware (e.g. ethernet) address. */
	unformat_function_t *unformat_hw_address;

	/* Parser for packet header for e.g. rewrite string. */
	unformat_function_t *unformat_header;

	/* Builds a rewrite string for the interface to the destination
	* for the payload/link type. */
	u8 (build_rewrite) (struct vnet_main_t * vnm,
	u32 sw_if_index,
	vnet_link_t link_type, const void *dst_hw_address);

	/* Update an adjacecny added by FIB (as opposed to via the
	* neighbour resolution protocol). */
	void (update_adjacency) (struct vnet_main_t vnm,
	u32 sw_if_index, u32 adj_index);

	uword (is_valid_class_for_interface) (struct vnet_main_t vnm,
	u32 hw_if_index,
	u32 hw_class_index);

	/* Called when hw interface class is changed and old hardware instance
	may want to be deleted. */
	void (hw_class_change) (struct vnet_main_t vnm, u32 hw_if_index,
	u32 old_class_index, u32 new_class_index);

	/* List of hw interface classes, built by constructors */
	struct _vnet_hw_interface_class *next_class_registration;

	} vnet_hw_interface_class_t;

	/**
	* @brief Return a complete, zero-length (aka dummy) rewrite
	*/
	extern u8 default_build_rewrite (struct vnet_main_t vnm,
	u32 sw_if_index,
	vnet_link_t link_type,
	const void *dst_hw_address);

	/**
	* @brief Default adjacency update function
	*/
	extern void default_update_adjacency (struct vnet_main_t *vnm,
	u32 sw_if_index, u32 adj_index);

	#define VNET_HW_INTERFACE_CLASS(x,...) \
	__VA_ARGS__ vnet_hw_interface_class_t x; \
	static void __vnet_add_hw_interface_class_registration_##x (void) \
	__attribute__((__constructor__)) ; \
	static void __vnet_add_hw_interface_class_registration_##x (void) \
	{ \
	vnet_main_t * vnm = vnet_get_main(); \
	x.next_class_registration = vnm->hw_interface_class_registrations; \
	vnm->hw_interface_class_registrations = &x; \
	} \
	__VA_ARGS__ vnet_hw_interface_class_t x

	/* Hardware-interface. This corresponds to a physical wire
	that packets flow over. */
	typedef struct vnet_hw_interface_t
	{
	/* Interface name. */
	u8 *name;

	u32 flags;
	/* Hardware link state is up. */
	#define VNET_HW_INTERFACE_FLAG_LINK_UP (1 << 0)
	/* Hardware duplex state */
	#define VNET_HW_INTERFACE_FLAG_DUPLEX_SHIFT 1
	#define VNET_HW_INTERFACE_FLAG_HALF_DUPLEX (1 << 1)
	#define VNET_HW_INTERFACE_FLAG_FULL_DUPLEX (1 << 2)
	#define VNET_HW_INTERFACE_FLAG_DUPLEX_MASK \
	(VNET_HW_INTERFACE_FLAG_HALF_DUPLEX \| \
	VNET_HW_INTERFACE_FLAG_FULL_DUPLEX)

	/* Hardware link speed */
	#define VNET_HW_INTERFACE_FLAG_SPEED_SHIFT 3
	#define VNET_HW_INTERFACE_FLAG_SPEED_10M (1 << 3)
	#define VNET_HW_INTERFACE_FLAG_SPEED_100M (1 << 4)
	#define VNET_HW_INTERFACE_FLAG_SPEED_1G (1 << 5)
	#define VNET_HW_INTERFACE_FLAG_SPEED_10G (1 << 6)
	#define VNET_HW_INTERFACE_FLAG_SPEED_40G (1 << 7)
	#define VNET_HW_INTERFACE_FLAG_SPEED_100G (1 << 8)
	#define VNET_HW_INTERFACE_FLAG_SPEED_MASK \
	(VNET_HW_INTERFACE_FLAG_SPEED_10M \| \
	VNET_HW_INTERFACE_FLAG_SPEED_100M \| \
	VNET_HW_INTERFACE_FLAG_SPEED_1G \| \
	VNET_HW_INTERFACE_FLAG_SPEED_10G \| \
	VNET_HW_INTERFACE_FLAG_SPEED_40G \| \
	VNET_HW_INTERFACE_FLAG_SPEED_100G)

	/* l2output node flags */
	#define VNET_HW_INTERFACE_FLAG_L2OUTPUT_SHIFT 9
	#define VNET_HW_INTERFACE_FLAG_L2OUTPUT_MAPPED (1 << 9)

	/* Hardware address as vector. Zero (e.g. zero-length vector) if no
	address for this class (e.g. PPP). */
	u8 *hw_address;

	/* Interface is up as far as software is concerned. */
	/* NAME.{output,tx} nodes for this interface. */
	u32 output_node_index, tx_node_index;

	/* (dev_class, dev_instance) uniquely identifies hw interface. */
	u32 dev_class_index;
	u32 dev_instance;

	/* (hw_class, hw_instance) uniquely identifies hw interface. */
	u32 hw_class_index;
	u32 hw_instance;

	/* Hardware index for this hardware interface. */
	u32 hw_if_index;

	/* Software index for this hardware interface. */
	u32 sw_if_index;

	/* Maximum transmit rate for this interface in bits/sec. */
	f64 max_rate_bits_per_sec;

	/* Smallest packet size supported by this interface. */
	u32 min_supported_packet_bytes;

	/* Largest packet size supported by this interface. */
	u32 max_supported_packet_bytes;

	/* Smallest packet size for this interface. */
	u32 min_packet_bytes;

	/* Largest packet size for this interface. */
	u32 max_packet_bytes;

	/* Number of extra bytes that go on the wire.
	Packet length on wire
	= max (length + per_packet_overhead_bytes, min_packet_bytes). */
	u32 per_packet_overhead_bytes;

	/* Receive and transmit layer 3 packet size limits (MRU/MTU). */
	u32 max_l3_packet_bytes[VLIB_N_RX_TX];

	/* Hash table mapping sub interface id to sw_if_index. */
	uword *sub_interface_sw_if_index_by_id;

	/* Count of number of L2 subinterfaces */
	u32 l2_if_count;

	/* Bonded interface info -
	0 - not a bonded interface nor a slave
	~0 - slave to a bonded interface
	others - A bonded interface with a pointer to bitmap for all slaves */
	uword *bond_info;
	#define VNET_HW_INTERFACE_BOND_INFO_NONE ((uword *) 0)
	#define VNET_HW_INTERFACE_BOND_INFO_SLAVE ((uword *) ~0)

	/* Input node */
	u32 input_node_index;

	/* input node cpu index by queue */
	u32 *input_node_cpu_index_by_queue;

	} vnet_hw_interface_t;

	extern vnet_device_class_t vnet_local_interface_device_class;

	typedef enum
	{
	/* A hw interface. */
	VNET_SW_INTERFACE_TYPE_HARDWARE,

	/* A sub-interface. */
	VNET_SW_INTERFACE_TYPE_SUB,
	} vnet_sw_interface_type_t;

	typedef struct
	{
	/*
	* Subinterface ID. A number 0-N to uniquely identify
	* this subinterface under the main (parent?) interface
	*/
	u32 id;

	/* Classification data. Used to associate packet header with subinterface. */
	struct
	{
	u16 outer_vlan_id;
	u16 inner_vlan_id;
	union
	{
	u16 raw_flags;
	struct
	{
	u16 no_tags:1;
	u16 one_tag:1;
	u16 two_tags:1;
	u16 dot1ad:1; /* 0 = dot1q, 1=dot1ad */
	u16 exact_match:1;
	u16 default_sub:1;
	u16 outer_vlan_id_any:1;
	u16 inner_vlan_id_any:1;
	} flags;
	};
	} eth;
	} vnet_sub_interface_t;

	typedef enum
	{
	/* Always flood */
	VNET_FLOOD_CLASS_NORMAL,
	VNET_FLOOD_CLASS_TUNNEL_MASTER,
	/* Does not flood when tunnel master is in the same L2 BD */
	VNET_FLOOD_CLASS_TUNNEL_NORMAL
	} vnet_flood_class_t;

	/* Software-interface. This corresponds to a Ethernet VLAN, ATM vc, a
	tunnel, etc. Configuration (e.g. IP address) gets attached to
	software interface. */
	typedef struct
	{
	vnet_sw_interface_type_t type:16;

	u16 flags;
	/* Interface is "up" meaning adminstratively up.
	Up in the sense of link state being up is maintained by hardware interface. */
	#define VNET_SW_INTERFACE_FLAG_ADMIN_UP (1 << 0)

	/* Interface is disabled for forwarding: punt all traffic to slow-path. */
	#define VNET_SW_INTERFACE_FLAG_PUNT (1 << 1)

	#define VNET_SW_INTERFACE_FLAG_PROXY_ARP (1 << 2)

	#define VNET_SW_INTERFACE_FLAG_UNNUMBERED (1 << 3)

	#define VNET_SW_INTERFACE_FLAG_BOND_SLAVE (1 << 4)

	/* Interface does not appear in CLI/API */
	#define VNET_SW_INTERFACE_FLAG_HIDDEN (1 << 5)

	/* Index for this interface. */
	u32 sw_if_index;

	/* Software interface index of super-interface;
	equal to sw_if_index if this interface is not a
	sub-interface. */
	u32 sup_sw_if_index;

	/* this swif is unnumbered, use addresses on unnumbered_sw_if_index... */
	u32 unnumbered_sw_if_index;

	u32 link_speed;

	union
	{
	/* VNET_SW_INTERFACE_TYPE_HARDWARE. */
	u32 hw_if_index;

	/* VNET_SW_INTERFACE_TYPE_SUB. */
	vnet_sub_interface_t sub;
	};

	vnet_flood_class_t flood_class;
	} vnet_sw_interface_t;

	typedef enum
	{
	/* Simple counters. */
	VNET_INTERFACE_COUNTER_DROP = 0,
	VNET_INTERFACE_COUNTER_PUNT = 1,
	VNET_INTERFACE_COUNTER_IP4 = 2,
	VNET_INTERFACE_COUNTER_IP6 = 3,
	VNET_INTERFACE_COUNTER_RX_NO_BUF = 4,
	VNET_INTERFACE_COUNTER_RX_MISS = 5,
	VNET_INTERFACE_COUNTER_RX_ERROR = 6,
	VNET_INTERFACE_COUNTER_TX_ERROR = 7,
	VNET_INTERFACE_COUNTER_MPLS = 8,
	VNET_N_SIMPLE_INTERFACE_COUNTER = 9,
	/* Combined counters. */
	VNET_INTERFACE_COUNTER_RX = 0,
	VNET_INTERFACE_COUNTER_TX = 1,
	VNET_N_COMBINED_INTERFACE_COUNTER = 2,
	} vnet_interface_counter_type_t;

	typedef struct
	{
	u32 output_node_index;
	u32 tx_node_index;
	} vnet_hw_interface_nodes_t;

	typedef struct
	{
	/* Hardware interfaces. */
	vnet_hw_interface_t *hw_interfaces;

	/* Hash table mapping HW interface name to index. */
	uword *hw_interface_by_name;

	/* Vectors if hardware interface classes and device classes. */
	vnet_hw_interface_class_t *hw_interface_classes;
	vnet_device_class_t *device_classes;

	/* Hash table mapping name to hw interface/device class. */
	uword *hw_interface_class_by_name;
	uword *device_class_by_name;

	/* Software interfaces. */
	vnet_sw_interface_t *sw_interfaces;

	/* Hash table mapping sub intfc sw_if_index by sup sw_if_index and sub id */
	uword *sw_if_index_by_sup_and_sub;

	/* Software interface counters both simple and combined
	packet and byte counters. */
	volatile u32 *sw_if_counter_lock;
	vlib_simple_counter_main_t *sw_if_counters;
	vlib_combined_counter_main_t *combined_sw_if_counters;

	vnet_hw_interface_nodes_t *deleted_hw_interface_nodes;

	/* pcap drop tracing */
	int drop_pcap_enable;
	pcap_main_t pcap_main;
	u8 *pcap_filename;
	u32 pcap_sw_if_index;
	u32 pcap_pkts_to_capture;
	uword *pcap_drop_filter_hash;

	/* feature_arc_index */
	u8 output_feature_arc_index;
	} vnet_interface_main_t;

	static inline void
	vnet_interface_counter_lock (vnet_interface_main_t * im)
	{
	if (im->sw_if_counter_lock)
	while (__sync_lock_test_and_set (im->sw_if_counter_lock, 1))
	/* zzzz */ ;
	}

	static inline void
	vnet_interface_counter_unlock (vnet_interface_main_t * im)
	{
	if (im->sw_if_counter_lock)
	*im->sw_if_counter_lock = 0;
	}

	void vnet_pcap_drop_trace_filter_add_del (u32 error_index, int is_add);

	int vnet_interface_name_renumber (u32 sw_if_index, u32 new_show_dev_instance);

	#endif /* included_vnet_interface_h */

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/