ioam_export.h

Go to the documentation of this file.

/*
 * 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/ip6_hop_by_hop.h>
#include <vnet/udp/udp_local.h>
#include <vnet/udp/udp_packet.h>
#include <vnet/ipfix-export/ipfix_packet.h>
 
#include <vppinfra/pool.h>
#include <vppinfra/hash.h>
#include <vppinfra/error.h>
#include <vppinfra/elog.h>
#include <vppinfra/lock.h>
 
#include <vlib/threads.h>
 
typedef struct ioam_export_buffer
{
  /** Required for pool_get_aligned */
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
  /* 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;
  u16 set_id;
 
  /* 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 */
  clib_spinlock_t *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 next_node_index;
 
  uword my_hbh_slot;
  u32 export_process_node_index;
} ioam_export_main_t;
 
 
#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
 
inline static void
ioam_export_set_next_node (ioam_export_main_t * em, u8 * next_node_name)
{
  vlib_node_t *next_node;
 
  next_node = vlib_get_node_by_name (em->vlib_main, next_node_name);
  em->next_node_index = next_node->index;
}
 
inline static void
ioam_export_reset_next_node (ioam_export_main_t * em)
{
  vlib_node_t *next_node;
 
  next_node = vlib_get_node_by_name (em->vlib_main, (u8 *) "ip4-lookup");
  em->next_node_index = next_node->index;
}
 
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_fast (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;
 
  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);
 
  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);
      clib_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);
        }
      clib_spinlock_init (&em->lockp[i]);
    }
  return (1);
}
 
#define IPFIX_IOAM_EXPORT_ID 272
#define IPFIX_VXLAN_IOAM_EXPORT_ID 273
 
/* 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 (UDP_DST_PORT_ipfix);
  udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_ipfix);
  /* 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 (em->set_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 (em->set_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->next_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->next_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 (CLIB_SPINLOCK_IS_LOCKED (&em->lockp[i]))
            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);
              clib_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++)
            {
              clib_spinlock_lock (&em->lockp[thread_index[i]]);
              em->buffer_per_thread[thread_index[i]] =
                vec_pop (vec_buffer_indices);
              clib_spinlock_unlock (&em->lockp[thread_index[i]]);
            }
 
          /* 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, FIXUP_FUNC)   \
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;                                         \
  clib_spinlock_lock (&(EM)->lockp[(VM)->thread_index]);                       \
  my_buf = ioam_export_get_my_buffer (EM, (VM)->thread_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);     \
          FIXUP_FUNC(eb0, p0);                                                 \
          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);     \
          FIXUP_FUNC(eb0, p1);                                                 \
          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);     \
          FIXUP_FUNC(eb0, p0);                                                 \
          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);          \
  clib_spinlock_unlock (&(EM)->lockp[(VM)->thread_index]);                     \
} while(0)
 
#endif /* __included_ioam_export_h__ */
 
/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */