src/vnet/vxlan-gpe/encap.c - 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.
  */
 /**
  *  @file
  *  @brief Functions for encapsulating VXLAN GPE tunnels
  *
 */
 #include <vppinfra/error.h>
 #include <vppinfra/hash.h>
 #include <vnet/vnet.h>
 #include <vnet/ip/ip.h>
 #include <vnet/ethernet/ethernet.h>
 #include <vnet/vxlan-gpe/vxlan_gpe.h>

 /** Statistics (not really errors) */
 #define foreach_vxlan_gpe_encap_error    \
 _(ENCAPSULATED, "good packets encapsulated")

 /**
  * @brief VXLAN GPE encap error strings
  */
 static char * vxlan_gpe_encap_error_strings[] = {
 #define _(sym,string) string,
   foreach_vxlan_gpe_encap_error
 #undef _
 };

 /**
  * @brief Struct for VXLAN GPE errors/counters
  */
 typedef enum {
 #define _(sym,str) VXLAN_GPE_ENCAP_ERROR_##sym,
     foreach_vxlan_gpe_encap_error
 #undef _
     VXLAN_GPE_ENCAP_N_ERROR,
 } vxlan_gpe_encap_error_t;

 /**
  * @brief Struct for tracing VXLAN GPE encapsulated packets
  */
 typedef struct {
   u32 tunnel_index;
 } vxlan_gpe_encap_trace_t;

 /**
  * @brief Trace of packets encapsulated in VXLAN GPE
  *
  * @param *s
  * @param *args
  *
  * @return *s
  *
  */
 u8 * format_vxlan_gpe_encap_trace (u8 * s, va_list * args)
 {
   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
   vxlan_gpe_encap_trace_t * t
       = va_arg (*args, vxlan_gpe_encap_trace_t *);

   s = format (s, "VXLAN-GPE-ENCAP: tunnel %d", t->tunnel_index);
   return s;
 }

 /**
  * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup
  *
  * @param *ngm
  * @param *b0
  * @param *t0 contains rewrite header
  * @param *next0 relative index of next dispatch function (next node)
  * @param is_v4 Is this IPv4? (or IPv6)
  *
  */
 always_inline void
 vxlan_gpe_encap_one_inline (vxlan_gpe_main_t * ngm, vlib_buffer_t * b0,
                             vxlan_gpe_tunnel_t * t0, u32 * next0,
                             u8 is_v4)
 {
   ASSERT(sizeof(ip4_vxlan_gpe_header_t) == 36);
   ASSERT(sizeof(ip6_vxlan_gpe_header_t) == 56);

   ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, is_v4);
   next0[0] = t0->encap_next_node;
 }

 /**
  * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup for two packets
  *
  * @param *ngm
  * @param *b0 Packet0
  * @param *b1 Packet1
  * @param *t0 contains rewrite header for Packet0
  * @param *t1 contains rewrite header for Packet1
  * @param *next0 relative index of next dispatch function (next node) for Packet0
  * @param *next1 relative index of next dispatch function (next node) for Packet1
  * @param is_v4 Is this IPv4? (or IPv6)
  *
  */
 always_inline void
 vxlan_gpe_encap_two_inline (vxlan_gpe_main_t * ngm, vlib_buffer_t * b0,
                             vlib_buffer_t * b1, vxlan_gpe_tunnel_t * t0,
                             vxlan_gpe_tunnel_t * t1, u32 * next0,
                             u32 * next1, u8 is_v4)
 {
   ASSERT(sizeof(ip4_vxlan_gpe_header_t) == 36);
   ASSERT(sizeof(ip6_vxlan_gpe_header_t) == 56);

   ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, is_v4);
   ip_udp_encap_one (ngm->vlib_main, b1, t1->rewrite, t1->rewrite_size, is_v4);
   next0[0] = next1[0] = t0->encap_next_node;
 }

 /**
  * @brief Common processing for IPv4 and IPv6 VXLAN GPE encap dispatch functions
  *
  * It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE
  * tunnels are "establish local". This means that we don't have a TX interface as yet
  * as we need to look up where the outer-header dest is. By setting the TX index in the
  * buffer metadata to the encap FIB, we can do a lookup to get the adjacency and real TX.
  *
  *      vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
  *
  * @node vxlan-gpe-input
  * @param *vm
  * @param *node
  * @param *from_frame
  *
  * @return from_frame->n_vectors
  *
  */
 static uword
 vxlan_gpe_encap (vlib_main_t * vm,
                vlib_node_runtime_t * node,
                vlib_frame_t * from_frame)
 {
   u32 n_left_from, next_index, *from, *to_next;
   vxlan_gpe_main_t * ngm = &vxlan_gpe_main;
   vnet_main_t * vnm = ngm->vnet_main;
   vnet_interface_main_t * im = &vnm->interface_main;
   u32 pkts_encapsulated = 0;
   u32 thread_index = vlib_get_thread_index ();
   u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;

   from = vlib_frame_vector_args (from_frame);
   n_left_from = from_frame->n_vectors;

   next_index = node->cached_next_index;
   stats_sw_if_index = node->runtime_data[0];
   stats_n_packets = stats_n_bytes = 0;

   while (n_left_from > 0)
   {
     u32 n_left_to_next;

     vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);

     while (n_left_from >= 4 && n_left_to_next >= 2)
     {
       u32 bi0, bi1;
       vlib_buffer_t * b0, *b1;
       u32 next0, next1;
       u32 sw_if_index0, sw_if_index1, len0, len1;
       vnet_hw_interface_t * hi0, *hi1;
       vxlan_gpe_tunnel_t * t0, *t1;
       u8 is_ip4_0, is_ip4_1;

       next0 = next1 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;

       /* Prefetch next iteration. */
       {
         vlib_buffer_t * p2, *p3;

         p2 = vlib_get_buffer (vm, from[2]);
         p3 = vlib_get_buffer (vm, from[3]);

         vlib_prefetch_buffer_header(p2, LOAD);
         vlib_prefetch_buffer_header(p3, LOAD);

         CLIB_PREFETCH(p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
         CLIB_PREFETCH(p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
       }

       bi0 = from[0];
       bi1 = from[1];
       to_next[0] = bi0;
       to_next[1] = bi1;
       from += 2;
       to_next += 2;
       n_left_to_next -= 2;
       n_left_from -= 2;

       b0 = vlib_get_buffer (vm, bi0);
       b1 = vlib_get_buffer (vm, bi1);

       /* 1-wide cache? */
       sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
       sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
       hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
       hi1 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b1)->sw_if_index[VLIB_TX]);

       t0 = pool_elt_at_index(ngm->tunnels, hi0->dev_instance);
       t1 = pool_elt_at_index(ngm->tunnels, hi1->dev_instance);

       is_ip4_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4);
       is_ip4_1 = (t1->flags & VXLAN_GPE_TUNNEL_IS_IPV4);

       if (PREDICT_TRUE(is_ip4_0 == is_ip4_1))
       {
         vxlan_gpe_encap_two_inline (ngm, b0, b1, t0, t1, &next0, &next1,is_ip4_0);
       }
       else
       {
         vxlan_gpe_encap_one_inline (ngm, b0, t0, &next0, is_ip4_0);
         vxlan_gpe_encap_one_inline (ngm, b1, t1, &next1, is_ip4_1);
       }

       /* Reset to look up tunnel partner in the configured FIB */
       vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
       vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_fib_index;
       vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
       vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1;
       pkts_encapsulated += 2;

       len0 = vlib_buffer_length_in_chain (vm, b0);
       len1 = vlib_buffer_length_in_chain (vm, b0);
       stats_n_packets += 2;
       stats_n_bytes += len0 + len1;

       /* Batch stats increment on the same vxlan tunnel so counter is not
        incremented per packet. Note stats are still incremented for deleted
        and admin-down tunnel where packets are dropped. It is not worthwhile
        to check for this rare case and affect normal path performance. */
       if (PREDICT_FALSE((sw_if_index0 != stats_sw_if_index)
               || (sw_if_index1 != stats_sw_if_index)))
       {
         stats_n_packets -= 2;
         stats_n_bytes -= len0 + len1;
         if (sw_if_index0 == sw_if_index1)
         {
           if (stats_n_packets)
             vlib_increment_combined_counter (
                 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
                 thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
           stats_sw_if_index = sw_if_index0;
           stats_n_packets = 2;
           stats_n_bytes = len0 + len1;
         }
         else
         {
           vlib_increment_combined_counter (
               im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
               thread_index, sw_if_index0, 1, len0);
           vlib_increment_combined_counter (
               im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
               thread_index, sw_if_index1, 1, len1);
         }
       }

       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
       {
         vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof(*tr));
         tr->tunnel_index = t0 - ngm->tunnels;
       }

       if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
       {
         vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b1,
                                                       sizeof(*tr));
         tr->tunnel_index = t1 - ngm->tunnels;
       }

       vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
                                       n_left_to_next, bi0, bi1, next0, next1);
     }

     while (n_left_from > 0 && n_left_to_next > 0)
     {
       u32 bi0;
       vlib_buffer_t * b0;
       u32 next0 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
       u32 sw_if_index0, len0;
       vnet_hw_interface_t * hi0;
       vxlan_gpe_tunnel_t * t0;
       u8 is_ip4_0;

       bi0 = from[0];
       to_next[0] = bi0;
       from += 1;
       to_next += 1;
       n_left_from -= 1;
       n_left_to_next -= 1;

       b0 = vlib_get_buffer (vm, bi0);

       /* 1-wide cache? */
       sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
       hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);

       t0 = pool_elt_at_index(ngm->tunnels, hi0->dev_instance);

       is_ip4_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4);

       vxlan_gpe_encap_one_inline (ngm, b0, t0, &next0, is_ip4_0);

       /* Reset to look up tunnel partner in the configured FIB */
       vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
       vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
       pkts_encapsulated++;

       len0 = vlib_buffer_length_in_chain (vm, b0);
       stats_n_packets += 1;
       stats_n_bytes += len0;

       /* Batch stats increment on the same vxlan tunnel so counter is not
        *  incremented per packet. Note stats are still incremented for deleted
        *  and admin-down tunnel where packets are dropped. It is not worthwhile
        *  to check for this rare case and affect normal path performance. */
       if (PREDICT_FALSE(sw_if_index0 != stats_sw_if_index))
       {
         stats_n_packets -= 1;
         stats_n_bytes -= len0;
         if (stats_n_packets)
           vlib_increment_combined_counter (
               im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
               thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
         stats_n_packets = 1;
         stats_n_bytes = len0;
         stats_sw_if_index = sw_if_index0;
       }
       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
       {
         vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b0,
                                                       sizeof(*tr));
         tr->tunnel_index = t0 - ngm->tunnels;
       }
       vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
                                       n_left_to_next, bi0, next0);
     }

     vlib_put_next_frame (vm, node, next_index, n_left_to_next);
   }
   vlib_node_increment_counter (vm, node->node_index,
                                VXLAN_GPE_ENCAP_ERROR_ENCAPSULATED,
                                pkts_encapsulated);
   /* Increment any remaining batch stats */
   if (stats_n_packets)
   {
     vlib_increment_combined_counter (
         im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index,
         stats_sw_if_index, stats_n_packets, stats_n_bytes);
     node->runtime_data[0] = stats_sw_if_index;
   }

   return from_frame->n_vectors;
 }

 VLIB_REGISTER_NODE (vxlan_gpe_encap_node) = {
   .function = vxlan_gpe_encap,
   .name = "vxlan-gpe-encap",
   .vector_size = sizeof (u32),
   .format_trace = format_vxlan_gpe_encap_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

   .n_errors = ARRAY_LEN(vxlan_gpe_encap_error_strings),
   .error_strings = vxlan_gpe_encap_error_strings,

   .n_next_nodes = VXLAN_GPE_ENCAP_N_NEXT,

   .next_nodes = {
     [VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
     [VXLAN_GPE_ENCAP_NEXT_IP6_LOOKUP] = "ip6-lookup",
     [VXLAN_GPE_ENCAP_NEXT_DROP] = "error-drop",
   },
 };
	/*
	* 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.
	*/
	/**
	* @file
	* @brief Functions for encapsulating VXLAN GPE tunnels
	*
	*/
	#include <vppinfra/error.h>
	#include <vppinfra/hash.h>
	#include <vnet/vnet.h>
	#include <vnet/ip/ip.h>
	#include <vnet/ethernet/ethernet.h>
	#include <vnet/vxlan-gpe/vxlan_gpe.h>

	/** Statistics (not really errors) */
	#define foreach_vxlan_gpe_encap_error \
	_(ENCAPSULATED, "good packets encapsulated")

	/**
	* @brief VXLAN GPE encap error strings
	*/
	static char * vxlan_gpe_encap_error_strings[] = {
	#define _(sym,string) string,
	foreach_vxlan_gpe_encap_error
	#undef _
	};

	/**
	* @brief Struct for VXLAN GPE errors/counters
	*/
	typedef enum {
	#define _(sym,str) VXLAN_GPE_ENCAP_ERROR_##sym,
	foreach_vxlan_gpe_encap_error
	#undef _
	VXLAN_GPE_ENCAP_N_ERROR,
	} vxlan_gpe_encap_error_t;

	/**
	* @brief Struct for tracing VXLAN GPE encapsulated packets
	*/
	typedef struct {
	u32 tunnel_index;
	} vxlan_gpe_encap_trace_t;

	/**
	* @brief Trace of packets encapsulated in VXLAN GPE
	*
	* @param *s
	* @param *args
	*
	* @return *s
	*
	*/
	u8 * format_vxlan_gpe_encap_trace (u8 * s, va_list * args)
	{
	CLIB_UNUSED (vlib_main_t * vm) = va_arg (args, vlib_main_t );
	CLIB_UNUSED (vlib_node_t * node) = va_arg (args, vlib_node_t );
	vxlan_gpe_encap_trace_t * t
	= va_arg (args, vxlan_gpe_encap_trace_t );

	s = format (s, "VXLAN-GPE-ENCAP: tunnel %d", t->tunnel_index);
	return s;
	}

	/**
	* @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4\|6 lookup
	*
	* @param *ngm
	* @param *b0
	* @param *t0 contains rewrite header
	* @param *next0 relative index of next dispatch function (next node)
	* @param is_v4 Is this IPv4? (or IPv6)
	*
	*/
	always_inline void
	vxlan_gpe_encap_one_inline (vxlan_gpe_main_t * ngm, vlib_buffer_t * b0,
	vxlan_gpe_tunnel_t * t0, u32 * next0,
	u8 is_v4)
	{
	ASSERT(sizeof(ip4_vxlan_gpe_header_t) == 36);
	ASSERT(sizeof(ip6_vxlan_gpe_header_t) == 56);

	ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, is_v4);
	next0[0] = t0->encap_next_node;
	}

	/**
	* @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4\|6 lookup for two packets
	*
	* @param *ngm
	* @param *b0 Packet0
	* @param *b1 Packet1
	* @param *t0 contains rewrite header for Packet0
	* @param *t1 contains rewrite header for Packet1
	* @param *next0 relative index of next dispatch function (next node) for Packet0
	* @param *next1 relative index of next dispatch function (next node) for Packet1
	* @param is_v4 Is this IPv4? (or IPv6)
	*
	*/
	always_inline void
	vxlan_gpe_encap_two_inline (vxlan_gpe_main_t * ngm, vlib_buffer_t * b0,
	vlib_buffer_t * b1, vxlan_gpe_tunnel_t * t0,
	vxlan_gpe_tunnel_t * t1, u32 * next0,
	u32 * next1, u8 is_v4)
	{
	ASSERT(sizeof(ip4_vxlan_gpe_header_t) == 36);
	ASSERT(sizeof(ip6_vxlan_gpe_header_t) == 56);

	ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, is_v4);
	ip_udp_encap_one (ngm->vlib_main, b1, t1->rewrite, t1->rewrite_size, is_v4);
	next0[0] = next1[0] = t0->encap_next_node;
	}

	/**
	* @brief Common processing for IPv4 and IPv6 VXLAN GPE encap dispatch functions
	*
	* It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE
	* tunnels are "establish local". This means that we don't have a TX interface as yet
	* as we need to look up where the outer-header dest is. By setting the TX index in the
	* buffer metadata to the encap FIB, we can do a lookup to get the adjacency and real TX.
	*
	* vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
	*
	* @node vxlan-gpe-input
	* @param *vm
	* @param *node
	* @param *from_frame
	*
	* @return from_frame->n_vectors
	*
	*/
	static uword
	vxlan_gpe_encap (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame)
	{
	u32 n_left_from, next_index, from, to_next;
	vxlan_gpe_main_t * ngm = &vxlan_gpe_main;
	vnet_main_t * vnm = ngm->vnet_main;
	vnet_interface_main_t * im = &vnm->interface_main;
	u32 pkts_encapsulated = 0;
	u32 thread_index = vlib_get_thread_index ();
	u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;

	from = vlib_frame_vector_args (from_frame);
	n_left_from = from_frame->n_vectors;

	next_index = node->cached_next_index;
	stats_sw_if_index = node->runtime_data[0];
	stats_n_packets = stats_n_bytes = 0;

	while (n_left_from > 0)
	{
	u32 n_left_to_next;

	vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);

	while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	u32 bi0, bi1;
	vlib_buffer_t * b0, *b1;
	u32 next0, next1;
	u32 sw_if_index0, sw_if_index1, len0, len1;
	vnet_hw_interface_t * hi0, *hi1;
	vxlan_gpe_tunnel_t * t0, *t1;
	u8 is_ip4_0, is_ip4_1;

	next0 = next1 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;

	/* Prefetch next iteration. */
	{
	vlib_buffer_t * p2, *p3;

	p2 = vlib_get_buffer (vm, from[2]);
	p3 = vlib_get_buffer (vm, from[3]);

	vlib_prefetch_buffer_header(p2, LOAD);
	vlib_prefetch_buffer_header(p3, LOAD);

	CLIB_PREFETCH(p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
	CLIB_PREFETCH(p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
	}

	bi0 = from[0];
	bi1 = from[1];
	to_next[0] = bi0;
	to_next[1] = bi1;
	from += 2;
	to_next += 2;
	n_left_to_next -= 2;
	n_left_from -= 2;

	b0 = vlib_get_buffer (vm, bi0);
	b1 = vlib_get_buffer (vm, bi1);

	/* 1-wide cache? */
	sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
	sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
	hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
	hi1 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b1)->sw_if_index[VLIB_TX]);

	t0 = pool_elt_at_index(ngm->tunnels, hi0->dev_instance);
	t1 = pool_elt_at_index(ngm->tunnels, hi1->dev_instance);

	is_ip4_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4);
	is_ip4_1 = (t1->flags & VXLAN_GPE_TUNNEL_IS_IPV4);

	if (PREDICT_TRUE(is_ip4_0 == is_ip4_1))
	{
	vxlan_gpe_encap_two_inline (ngm, b0, b1, t0, t1, &next0, &next1,is_ip4_0);
	}
	else
	{
	vxlan_gpe_encap_one_inline (ngm, b0, t0, &next0, is_ip4_0);
	vxlan_gpe_encap_one_inline (ngm, b1, t1, &next1, is_ip4_1);
	}

	/* Reset to look up tunnel partner in the configured FIB */
	vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
	vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_fib_index;
	vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
	vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1;
	pkts_encapsulated += 2;

	len0 = vlib_buffer_length_in_chain (vm, b0);
	len1 = vlib_buffer_length_in_chain (vm, b0);
	stats_n_packets += 2;
	stats_n_bytes += len0 + len1;

	/* Batch stats increment on the same vxlan tunnel so counter is not
	incremented per packet. Note stats are still incremented for deleted
	and admin-down tunnel where packets are dropped. It is not worthwhile
	to check for this rare case and affect normal path performance. */
	if (PREDICT_FALSE((sw_if_index0 != stats_sw_if_index)
	\|\| (sw_if_index1 != stats_sw_if_index)))
	{
	stats_n_packets -= 2;
	stats_n_bytes -= len0 + len1;
	if (sw_if_index0 == sw_if_index1)
	{
	if (stats_n_packets)
	vlib_increment_combined_counter (
	im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
	stats_sw_if_index = sw_if_index0;
	stats_n_packets = 2;
	stats_n_bytes = len0 + len1;
	}
	else
	{
	vlib_increment_combined_counter (
	im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	thread_index, sw_if_index0, 1, len0);
	vlib_increment_combined_counter (
	im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	thread_index, sw_if_index1, 1, len1);
	}
	}

	if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	vxlan_gpe_encap_trace_t tr = vlib_add_trace (vm, node, b0, sizeof(tr));
	tr->tunnel_index = t0 - ngm->tunnels;
	}

	if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
	{
	vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b1,
	sizeof(*tr));
	tr->tunnel_index = t1 - ngm->tunnels;
	}

	vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
	n_left_to_next, bi0, bi1, next0, next1);
	}

	while (n_left_from > 0 && n_left_to_next > 0)
	{
	u32 bi0;
	vlib_buffer_t * b0;
	u32 next0 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
	u32 sw_if_index0, len0;
	vnet_hw_interface_t * hi0;
	vxlan_gpe_tunnel_t * t0;
	u8 is_ip4_0;

	bi0 = from[0];
	to_next[0] = bi0;
	from += 1;
	to_next += 1;
	n_left_from -= 1;
	n_left_to_next -= 1;

	b0 = vlib_get_buffer (vm, bi0);

	/* 1-wide cache? */
	sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
	hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);

	t0 = pool_elt_at_index(ngm->tunnels, hi0->dev_instance);

	is_ip4_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4);

	vxlan_gpe_encap_one_inline (ngm, b0, t0, &next0, is_ip4_0);

	/* Reset to look up tunnel partner in the configured FIB */
	vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
	vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
	pkts_encapsulated++;

	len0 = vlib_buffer_length_in_chain (vm, b0);
	stats_n_packets += 1;
	stats_n_bytes += len0;

	/* Batch stats increment on the same vxlan tunnel so counter is not
	* incremented per packet. Note stats are still incremented for deleted
	* and admin-down tunnel where packets are dropped. It is not worthwhile
	* to check for this rare case and affect normal path performance. */
	if (PREDICT_FALSE(sw_if_index0 != stats_sw_if_index))
	{
	stats_n_packets -= 1;
	stats_n_bytes -= len0;
	if (stats_n_packets)
	vlib_increment_combined_counter (
	im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
	stats_n_packets = 1;
	stats_n_bytes = len0;
	stats_sw_if_index = sw_if_index0;
	}
	if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b0,
	sizeof(*tr));
	tr->tunnel_index = t0 - ngm->tunnels;
	}
	vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
	n_left_to_next, bi0, next0);
	}

	vlib_put_next_frame (vm, node, next_index, n_left_to_next);
	}
	vlib_node_increment_counter (vm, node->node_index,
	VXLAN_GPE_ENCAP_ERROR_ENCAPSULATED,
	pkts_encapsulated);
	/* Increment any remaining batch stats */
	if (stats_n_packets)
	{
	vlib_increment_combined_counter (
	im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index,
	stats_sw_if_index, stats_n_packets, stats_n_bytes);
	node->runtime_data[0] = stats_sw_if_index;
	}

	return from_frame->n_vectors;
	}

	VLIB_REGISTER_NODE (vxlan_gpe_encap_node) = {
	.function = vxlan_gpe_encap,
	.name = "vxlan-gpe-encap",
	.vector_size = sizeof (u32),
	.format_trace = format_vxlan_gpe_encap_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

	.n_errors = ARRAY_LEN(vxlan_gpe_encap_error_strings),
	.error_strings = vxlan_gpe_encap_error_strings,

	.n_next_nodes = VXLAN_GPE_ENCAP_N_NEXT,

	.next_nodes = {
	[VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
	[VXLAN_GPE_ENCAP_NEXT_IP6_LOOKUP] = "ip6-lookup",
	[VXLAN_GPE_ENCAP_NEXT_DROP] = "error-drop",
	},
	};