VPP-470: Introduce VxLAN-GPE as transport for iOAM.

See Jira ticket for more details
- New plugins created to (a) Add VxLAN-GPE as transport (b) Provide export infra for
  VxLAN-GPE.

Change-Id: Ife50c7434f53d17a4783062310f73d063d53494c
Signed-off-by: Vengada Govindan <venggovi@cisco.com>

1 files changed, 617 insertions, 0 deletions

diff --git a/plugins/ioam-plugin/ioam/export-common/ioam_export.h b/plugins/ioam-plugin/ioam/export-common/ioam_export.h
new file mode 100644
index 00000000000..82559c9f993
--- /dev/null
+++ b/plugins/ioam-plugin/ioam/export-common/ioam_export.h
@@ -0,0 +1,617 @@
+/*
+ * 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.
+ */
+#ifndef __included_ioam_export_h__
+#define __included_ioam_export_h__
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/ip_packet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/ip/udp.h>
+#include <vnet/flow/ipfix_packet.h>
+
+#include <vppinfra/pool.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+#include <vlib/threads.h>
+
+typedef struct ioam_export_buffer
+{
+  /* Allocated buffer */
+  u32 buffer_index;
+  u64 touched_at;
+  u8 records_in_this_buffer;
+} ioam_export_buffer_t;
+
+
+typedef struct
+{
+  /* API message ID base */
+  u16 msg_id_base;
+
+  /* TODO: to support multiple collectors all this has to be grouped and create a vector here */
+  u8 *record_header;
+  u32 sequence_number;
+  u32 domain_id;
+
+  /* ipfix collector, our ip address */
+  ip4_address_t ipfix_collector;
+  ip4_address_t src_address;
+
+  /* Pool of ioam_export_buffer_t */
+  ioam_export_buffer_t *buffer_pool;
+  /* Vector of per thread ioam_export_buffer_t to buffer pool index */
+  u32 *buffer_per_thread;
+  /* Lock per thread to swap buffers between worker and timer process */
+  volatile u32 **lockp;
+
+  /* time scale transform */
+  u32 unix_time_0;
+  f64 vlib_time_0;
+
+  /* convenience */
+  vlib_main_t *vlib_main;
+  vnet_main_t *vnet_main;
+  ethernet_main_t *ethernet_main;
+  u32 ip4_lookup_node_index;
+
+  uword my_hbh_slot;
+  u32 export_process_node_index;
+} ioam_export_main_t;
+
+ioam_export_main_t ioam_export_main;
+ioam_export_main_t vxlan_gpe_ioam_export_main;
+
+vlib_node_registration_t export_node;
+
+#define DEFAULT_EXPORT_SIZE (3 * CLIB_CACHE_LINE_BYTES)
+/*
+ *  Number of records in a buffer
+ * ~(MTU (1500) - [ip hdr(40) + UDP(8) + ipfix (24)]) / DEFAULT_EXPORT_SIZE
+ */
+#define DEFAULT_EXPORT_RECORDS 7
+
+always_inline ioam_export_buffer_t *
+ioam_export_get_my_buffer (ioam_export_main_t * em, u32 thread_id)
+{
+
+  if (vec_len (em->buffer_per_thread) > thread_id)
+    return (pool_elt_at_index
+	    (em->buffer_pool, em->buffer_per_thread[thread_id]));
+  return (0);
+}
+
+inline static int
+ioam_export_buffer_add_header (ioam_export_main_t * em, vlib_buffer_t * b0)
+{
+  clib_memcpy (b0->data, em->record_header, vec_len (em->record_header));
+  b0->current_data = 0;
+  b0->current_length = vec_len (em->record_header);
+  b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
+  return (1);
+}
+
+inline static int
+ioam_export_init_buffer (ioam_export_main_t * em, vlib_main_t * vm,
+			 ioam_export_buffer_t * eb)
+{
+  vlib_buffer_t *b = 0;
+
+  if (!eb)
+    return (-1);
+  /* TODO: Perhaps buffer init from template here */
+  if (vlib_buffer_alloc (vm, &(eb->buffer_index), 1) != 1)
+    return (-2);
+  eb->records_in_this_buffer = 0;
+  eb->touched_at = vlib_time_now (vm);
+  b = vlib_get_buffer (vm, eb->buffer_index);
+  (void) ioam_export_buffer_add_header (em, b);
+  vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
+  vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
+  return (1);
+}
+
+inline static void
+ioam_export_thread_buffer_free (ioam_export_main_t * em)
+{
+  vlib_main_t *vm = em->vlib_main;
+  ioam_export_buffer_t *eb = 0;
+  int i;
+  for (i = 0; i < vec_len (em->buffer_per_thread); i++)
+    {
+      eb = pool_elt_at_index (em->buffer_pool, em->buffer_per_thread[i]);
+      if (eb)
+	vlib_buffer_free (vm, &(eb->buffer_index), 1);
+    }
+  for (i = 0; i < vec_len (em->lockp); i++)
+    clib_mem_free ((void *) em->lockp[i]);
+  vec_free (em->buffer_per_thread);
+  pool_free (em->buffer_pool);
+  vec_free (em->lockp);
+  em->buffer_per_thread = 0;
+  em->buffer_pool = 0;
+  em->lockp = 0;
+}
+
+inline static int
+ioam_export_thread_buffer_init (ioam_export_main_t * em, vlib_main_t * vm)
+{
+  int no_of_threads = vec_len (vlib_worker_threads);
+  int i;
+  ioam_export_buffer_t *eb = 0;
+  vlib_node_t *ip4_lookup_node;
+
+  pool_alloc_aligned (em->buffer_pool,
+		      no_of_threads - 1, CLIB_CACHE_LINE_BYTES);
+  vec_validate_aligned (em->buffer_per_thread,
+			no_of_threads - 1, CLIB_CACHE_LINE_BYTES);
+  vec_validate_aligned (em->lockp, no_of_threads - 1, CLIB_CACHE_LINE_BYTES);
+  ip4_lookup_node = vlib_get_node_by_name (vm, (u8 *) "ip4-lookup");
+  em->ip4_lookup_node_index = ip4_lookup_node->index;
+  if (!em->buffer_per_thread || !em->buffer_pool || !em->lockp)
+    {
+      return (-1);
+    }
+  for (i = 0; i < no_of_threads; i++)
+    {
+      eb = 0;
+      pool_get_aligned (em->buffer_pool, eb, CLIB_CACHE_LINE_BYTES);
+      memset (eb, 0, sizeof (*eb));
+      em->buffer_per_thread[i] = eb - em->buffer_pool;
+      if (ioam_export_init_buffer (em, vm, eb) != 1)
+	{
+	  ioam_export_thread_buffer_free (em);
+	  return (-2);
+	}
+      em->lockp[i] = clib_mem_alloc_aligned (CLIB_CACHE_LINE_BYTES,
+					     CLIB_CACHE_LINE_BYTES);
+      memset ((void *) em->lockp[i], 0, CLIB_CACHE_LINE_BYTES);
+    }
+  return (1);
+}
+
+#define IPFIX_IOAM_EXPORT_ID 272
+
+/* Used to build the rewrite */
+/* data set packet */
+typedef struct
+{
+  ipfix_message_header_t h;
+  ipfix_set_header_t s;
+} ipfix_data_packet_t;
+
+typedef struct
+{
+  ip4_header_t ip4;
+  udp_header_t udp;
+  ipfix_data_packet_t ipfix;
+} ip4_ipfix_data_packet_t;
+
+
+inline static void
+ioam_export_header_cleanup (ioam_export_main_t * em,
+			    ip4_address_t * collector_address,
+			    ip4_address_t * src_address)
+{
+  vec_free (em->record_header);
+  em->record_header = 0;
+}
+
+inline static int
+ioam_export_header_create (ioam_export_main_t * em,
+			   ip4_address_t * collector_address,
+			   ip4_address_t * src_address)
+{
+  ip4_header_t *ip;
+  udp_header_t *udp;
+  ipfix_message_header_t *h;
+  ipfix_set_header_t *s;
+  u8 *rewrite = 0;
+  ip4_ipfix_data_packet_t *tp;
+
+
+  /* allocate rewrite space */
+  vec_validate_aligned (rewrite,
+			sizeof (ip4_ipfix_data_packet_t) - 1,
+			CLIB_CACHE_LINE_BYTES);
+
+  tp = (ip4_ipfix_data_packet_t *) rewrite;
+  ip = (ip4_header_t *) & tp->ip4;
+  udp = (udp_header_t *) (ip + 1);
+  h = (ipfix_message_header_t *) (udp + 1);
+  s = (ipfix_set_header_t *) (h + 1);
+
+  ip->ip_version_and_header_length = 0x45;
+  ip->ttl = 254;
+  ip->protocol = IP_PROTOCOL_UDP;
+  ip->src_address.as_u32 = src_address->as_u32;
+  ip->dst_address.as_u32 = collector_address->as_u32;
+  udp->src_port = clib_host_to_net_u16 (4939 /* $$FIXME */ );
+  udp->dst_port = clib_host_to_net_u16 (4939);
+  /* FIXUP: UDP length */
+  udp->length = clib_host_to_net_u16 (vec_len (rewrite) +
+				      (DEFAULT_EXPORT_RECORDS *
+				       DEFAULT_EXPORT_SIZE) - sizeof (*ip));
+
+  /* FIXUP: message header export_time */
+  /* FIXUP: message header sequence_number */
+  h->domain_id = clib_host_to_net_u32 (em->domain_id);
+
+  /*FIXUP: Setid length in octets if records exported are not default */
+  s->set_id_length = ipfix_set_id_length (IPFIX_IOAM_EXPORT_ID,
+					  (sizeof (*s) +
+					   (DEFAULT_EXPORT_RECORDS *
+					    DEFAULT_EXPORT_SIZE)));
+
+  /* FIXUP: h version and length length in octets if records exported are not default */
+  h->version_length = version_length (sizeof (*h) +
+				      (sizeof (*s) +
+				       (DEFAULT_EXPORT_RECORDS *
+					DEFAULT_EXPORT_SIZE)));
+
+  /* FIXUP: ip length if records exported are not default */
+  /* FIXUP: ip checksum if records exported are not default */
+  ip->length = clib_host_to_net_u16 (vec_len (rewrite) +
+				     (DEFAULT_EXPORT_RECORDS *
+				      DEFAULT_EXPORT_SIZE));
+  ip->checksum = ip4_header_checksum (ip);
+  _vec_len (rewrite) = sizeof (ip4_ipfix_data_packet_t);
+  em->record_header = rewrite;
+  return (1);
+}
+
+inline static int
+ioam_export_send_buffer (ioam_export_main_t * em, vlib_main_t * vm,
+			 ioam_export_buffer_t * eb)
+{
+  ip4_header_t *ip;
+  udp_header_t *udp;
+  ipfix_message_header_t *h;
+  ipfix_set_header_t *s;
+  ip4_ipfix_data_packet_t *tp;
+  vlib_buffer_t *b0;
+  u16 new_l0, old_l0;
+  ip_csum_t sum0;
+  vlib_frame_t *nf = 0;
+  u32 *to_next;
+
+  b0 = vlib_get_buffer (vm, eb->buffer_index);
+  tp = vlib_buffer_get_current (b0);
+  ip = (ip4_header_t *) & tp->ip4;
+  udp = (udp_header_t *) (ip + 1);
+  h = (ipfix_message_header_t *) (udp + 1);
+  s = (ipfix_set_header_t *) (h + 1);
+
+  /* FIXUP: message header export_time */
+  h->export_time = clib_host_to_net_u32 ((u32)
+					 (((f64) em->unix_time_0) +
+					  (vlib_time_now (em->vlib_main) -
+					   em->vlib_time_0)));
+
+  /* FIXUP: message header sequence_number */
+  h->sequence_number = clib_host_to_net_u32 (em->sequence_number++);
+
+  /* FIXUP: lengths if different from default */
+  if (PREDICT_FALSE (eb->records_in_this_buffer != DEFAULT_EXPORT_RECORDS))
+    {
+      s->set_id_length =
+	ipfix_set_id_length (IPFIX_IOAM_EXPORT_ID /* set_id */ ,
+			     b0->current_length - (sizeof (*ip) +
+						   sizeof (*udp) +
+						   sizeof (*h)));
+      h->version_length =
+	version_length (b0->current_length - (sizeof (*ip) + sizeof (*udp)));
+      sum0 = ip->checksum;
+      old_l0 = ip->length;
+      new_l0 = clib_host_to_net_u16 ((u16) b0->current_length);
+      sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
+			     length /* changed member */ );
+      ip->checksum = ip_csum_fold (sum0);
+      ip->length = new_l0;
+      udp->length = clib_host_to_net_u16 (b0->current_length - sizeof (*ip));
+    }
+
+  /* Enqueue pkts to ip4-lookup */
+
+  nf = vlib_get_frame_to_node (vm, em->ip4_lookup_node_index);
+  nf->n_vectors = 0;
+  to_next = vlib_frame_vector_args (nf);
+  nf->n_vectors = 1;
+  to_next[0] = eb->buffer_index;
+  vlib_put_frame_to_node (vm, em->ip4_lookup_node_index, nf);
+  return (1);
+
+}
+
+#define EXPORT_TIMEOUT (20.0)
+#define THREAD_PERIOD (30.0)
+inline static uword
+ioam_export_process_common (ioam_export_main_t * em, vlib_main_t * vm,
+			    vlib_node_runtime_t * rt, vlib_frame_t * f,
+			    u32 index)
+{
+  f64 now;
+  f64 timeout = 30.0;
+  uword event_type;
+  uword *event_data = 0;
+  int i;
+  ioam_export_buffer_t *eb = 0, *new_eb = 0;
+  u32 *vec_buffer_indices = 0;
+  u32 *vec_buffer_to_be_sent = 0;
+  u32 *thread_index = 0;
+  u32 new_pool_index = 0;
+
+  em->export_process_node_index = index;
+  /* Wait for Godot... */
+  vlib_process_wait_for_event_or_clock (vm, 1e9);
+  event_type = vlib_process_get_events (vm, &event_data);
+  if (event_type != 1)
+    clib_warning ("bogus kickoff event received, %d", event_type);
+  vec_reset_length (event_data);
+
+  while (1)
+    {
+      vlib_process_wait_for_event_or_clock (vm, timeout);
+      event_type = vlib_process_get_events (vm, &event_data);
+      switch (event_type)
+	{
+	case 2:		/* Stop and Wait for kickoff again */
+	  timeout = 1e9;
+	  break;
+	case 1:		/* kickoff : Check for unsent buffers */
+	  timeout = THREAD_PERIOD;
+	  break;
+	case ~0:		/* timeout */
+	  break;
+	}
+      vec_reset_length (event_data);
+      now = vlib_time_now (vm);
+      /*
+       * Create buffers for threads that are not active enough
+       * to send out the export records
+       */
+      for (i = 0; i < vec_len (em->buffer_per_thread); i++)
+	{
+	  /* If the worker thread is processing export records ignore further checks */
+	  if (*em->lockp[i] == 1)
+	    continue;
+	  eb = pool_elt_at_index (em->buffer_pool, em->buffer_per_thread[i]);
+	  if (eb->records_in_this_buffer > 0
+	      && now > (eb->touched_at + EXPORT_TIMEOUT))
+	    {
+	      pool_get_aligned (em->buffer_pool, new_eb,
+				CLIB_CACHE_LINE_BYTES);
+	      memset (new_eb, 0, sizeof (*new_eb));
+	      if (ioam_export_init_buffer (em, vm, new_eb) == 1)
+		{
+		  new_pool_index = new_eb - em->buffer_pool;
+		  vec_add (vec_buffer_indices, &new_pool_index, 1);
+		  vec_add (vec_buffer_to_be_sent, &em->buffer_per_thread[i],
+			   1);
+		  vec_add (thread_index, &i, 1);
+		}
+	      else
+		{
+		  pool_put (em->buffer_pool, new_eb);
+		  /*Give up */
+		  goto CLEANUP;
+		}
+	    }
+	}
+      if (vec_len (thread_index) != 0)
+	{
+	  /*
+	   * Now swap the buffers out
+	   */
+	  for (i = 0; i < vec_len (thread_index); i++)
+	    {
+	      while (__sync_lock_test_and_set (em->lockp[thread_index[i]], 1))
+		;
+	      em->buffer_per_thread[thread_index[i]] =
+		vec_pop (vec_buffer_indices);
+	      *em->lockp[thread_index[i]] = 0;
+	    }
+
+	  /* Send the buffers */
+	  for (i = 0; i < vec_len (vec_buffer_to_be_sent); i++)
+	    {
+	      eb =
+		pool_elt_at_index (em->buffer_pool, vec_buffer_to_be_sent[i]);
+	      ioam_export_send_buffer (em, vm, eb);
+	      pool_put (em->buffer_pool, eb);
+	    }
+	}
+
+    CLEANUP:
+      /* Free any leftover/unused buffers and everything that was allocated */
+      for (i = 0; i < vec_len (vec_buffer_indices); i++)
+	{
+	  new_eb = pool_elt_at_index (em->buffer_pool, vec_buffer_indices[i]);
+	  vlib_buffer_free (vm, &new_eb->buffer_index, 1);
+	  pool_put (em->buffer_pool, new_eb);
+	}
+      vec_free (vec_buffer_indices);
+      vec_free (vec_buffer_to_be_sent);
+      vec_free (thread_index);
+    }
+  return 0;			/* not so much */
+}
+
+#define ioam_export_node_common(EM, VM, N, F, HTYPE, L, V, NEXT)               \
+do {                                                                           \
+  u32 n_left_from, *from, *to_next;                                            \
+  export_next_t next_index;                                                    \
+  u32 pkts_recorded = 0;                                                       \
+  ioam_export_buffer_t *my_buf = 0;                                            \
+  vlib_buffer_t *eb0 = 0;                                                      \
+  u32 ebi0 = 0;                                                                \
+  from = vlib_frame_vector_args (F);                                           \
+  n_left_from = (F)->n_vectors;                                                \
+  next_index = (N)->cached_next_index;                                         \
+  while (__sync_lock_test_and_set ((EM)->lockp[(VM)->cpu_index], 1));          \
+  my_buf = ioam_export_get_my_buffer (EM, (VM)->cpu_index);                    \
+  my_buf->touched_at = vlib_time_now (VM);                                     \
+  while (n_left_from > 0)                                                      \
+    {                                                                          \
+      u32 n_left_to_next;                                                      \
+      vlib_get_next_frame (VM, N, next_index, to_next, n_left_to_next);        \
+      while (n_left_from >= 4 && n_left_to_next >= 2)                          \
+	{                                                                      \
+	  u32 next0 = NEXT;                                                    \
+	  u32 next1 = NEXT;                                                    \
+	  u32 bi0, bi1;                                                        \
+	  HTYPE *ip0, *ip1;                                                    \
+	  vlib_buffer_t *p0, *p1;                                              \
+	  u32 ip_len0, ip_len1;                                                \
+	  {                                                                    \
+	    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, 3 * CLIB_CACHE_LINE_BYTES, LOAD);         \
+	    CLIB_PREFETCH (p3->data, 3 * CLIB_CACHE_LINE_BYTES, LOAD);         \
+	  }                                                                    \
+	  to_next[0] = bi0 = from[0];                                          \
+	  to_next[1] = bi1 = from[1];                                          \
+	  from += 2;                                                           \
+	  to_next += 2;                                                        \
+	  n_left_from -= 2;                                                    \
+	  n_left_to_next -= 2;                                                 \
+	  p0 = vlib_get_buffer (VM, bi0);                                      \
+	  p1 = vlib_get_buffer (VM, bi1);                                      \
+	  ip0 = vlib_buffer_get_current (p0);                                  \
+	  ip1 = vlib_buffer_get_current (p1);                                  \
+	  ip_len0 =                                                            \
+	    clib_net_to_host_u16 (ip0->L) + sizeof (HTYPE);                    \
+	  ip_len1 =                                                            \
+	    clib_net_to_host_u16 (ip1->L) + sizeof (HTYPE);                    \
+	  ebi0 = my_buf->buffer_index;                                         \
+	  eb0 = vlib_get_buffer (VM, ebi0);                                    \
+	  if (PREDICT_FALSE (eb0 == 0))                                        \
+	    goto NO_BUFFER1;                                                   \
+	  ip_len0 =                                                            \
+	    ip_len0 > DEFAULT_EXPORT_SIZE ? DEFAULT_EXPORT_SIZE : ip_len0;     \
+	  ip_len1 =                                                            \
+	    ip_len1 > DEFAULT_EXPORT_SIZE ? DEFAULT_EXPORT_SIZE : ip_len1;     \
+	  copy3cachelines (eb0->data + eb0->current_length, ip0, ip_len0);     \
+	  eb0->current_length += DEFAULT_EXPORT_SIZE;                          \
+	  my_buf->records_in_this_buffer++;                                    \
+	  if (my_buf->records_in_this_buffer >= DEFAULT_EXPORT_RECORDS)        \
+	    {                                                                  \
+	      ioam_export_send_buffer (EM, VM, my_buf);                        \
+	      ioam_export_init_buffer (EM, VM, my_buf);                        \
+	    }                                                                  \
+	  ebi0 = my_buf->buffer_index;                                         \
+	  eb0 = vlib_get_buffer (VM, ebi0);                                    \
+	  if (PREDICT_FALSE (eb0 == 0))                                        \
+	    goto NO_BUFFER1;                                                   \
+	  copy3cachelines (eb0->data + eb0->current_length, ip1, ip_len1);     \
+	  eb0->current_length += DEFAULT_EXPORT_SIZE;                          \
+	  my_buf->records_in_this_buffer++;                                    \
+	  if (my_buf->records_in_this_buffer >= DEFAULT_EXPORT_RECORDS)        \
+	    {                                                                  \
+	      ioam_export_send_buffer (EM, VM, my_buf);                        \
+	      ioam_export_init_buffer (EM, VM, my_buf);                        \
+	    }                                                                  \
+	  pkts_recorded += 2;                                                  \
+	  if (PREDICT_FALSE (((node)->flags & VLIB_NODE_FLAG_TRACE)))          \
+	    {                                                                  \
+	      if (p0->flags & VLIB_BUFFER_IS_TRACED)                           \
+		{                                                              \
+		  export_trace_t *t =                                          \
+		    vlib_add_trace (VM, node, p0, sizeof (*t));                \
+		  t->flow_label =                                              \
+		    clib_net_to_host_u32 (ip0->V);                             \
+		  t->next_index = next0;                                       \
+		}                                                              \
+	      if (p1->flags & VLIB_BUFFER_IS_TRACED)                           \
+		{                                                              \
+		  export_trace_t *t =                                          \
+		    vlib_add_trace (VM, N, p1, sizeof (*t));                   \
+		  t->flow_label =                                              \
+		    clib_net_to_host_u32 (ip1->V);                             \
+		  t->next_index = next1;                                       \
+		}                                                              \
+	    }                                                                  \
+	NO_BUFFER1:                                                            \
+	  vlib_validate_buffer_enqueue_x2 (VM, N, 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 *p0;                                                   \
+	  u32 next0 = NEXT;                                                    \
+	  HTYPE *ip0;                                                          \
+	  u32 ip_len0;                                                         \
+	  bi0 = from[0];                                                       \
+	  to_next[0] = bi0;                                                    \
+	  from += 1;                                                           \
+	  to_next += 1;                                                        \
+	  n_left_from -= 1;                                                    \
+	  n_left_to_next -= 1;                                                 \
+	  p0 = vlib_get_buffer (VM, bi0);                                      \
+	  ip0 = vlib_buffer_get_current (p0);                                  \
+	  ip_len0 =                                                            \
+	    clib_net_to_host_u16 (ip0->L) + sizeof (HTYPE);                    \
+	  ebi0 = my_buf->buffer_index;                                         \
+	  eb0 = vlib_get_buffer (VM, ebi0);                                    \
+	  if (PREDICT_FALSE (eb0 == 0))                                        \
+	    goto NO_BUFFER;                                                    \
+	  ip_len0 =                                                            \
+	    ip_len0 > DEFAULT_EXPORT_SIZE ? DEFAULT_EXPORT_SIZE : ip_len0;     \
+	  copy3cachelines (eb0->data + eb0->current_length, ip0, ip_len0);     \
+	  eb0->current_length += DEFAULT_EXPORT_SIZE;                          \
+	  my_buf->records_in_this_buffer++;                                    \
+	  if (my_buf->records_in_this_buffer >= DEFAULT_EXPORT_RECORDS)        \
+	    {                                                                  \
+	      ioam_export_send_buffer (EM, VM, my_buf);                        \
+	      ioam_export_init_buffer (EM, VM, my_buf);                        \
+	    }                                                                  \
+	  if (PREDICT_FALSE (((N)->flags & VLIB_NODE_FLAG_TRACE)               \
+			     && (p0->flags & VLIB_BUFFER_IS_TRACED)))          \
+	    {                                                                  \
+	      export_trace_t *t = vlib_add_trace (VM, (N), p0, sizeof (*t));   \
+	      t->flow_label =                                                  \
+		clib_net_to_host_u32 (ip0->V);                                 \
+	      t->next_index = next0;                                           \
+	    }                                                                  \
+	  pkts_recorded += 1;                                                  \
+	NO_BUFFER:                                                             \
+	  vlib_validate_buffer_enqueue_x1 (VM, N, next_index,                  \
+					   to_next, n_left_to_next,            \
+					   bi0, next0);                        \
+	}                                                                      \
+      vlib_put_next_frame (VM, N, next_index, n_left_to_next);                 \
+    }                                                                          \
+  vlib_node_increment_counter (VM, export_node.index,                          \
+			       EXPORT_ERROR_RECORDED, pkts_recorded);          \
+  *(EM)->lockp[(VM)->cpu_index] = 0;                                           \
+} while(0)
+
+#endif /* __included_ioam_export_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */