api: refactor vlibmemory

- separate client/server code for both memory and socket apis
- separate memory api code from generic vlib api code
- move unix_shared_memory_fifo to svm and rename to svm_fifo_t
- overall declutter

Change-Id: I90cdd98ff74d0787d58825b914b0f1eafcfa4dc2
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 750 insertions, 0 deletions

diff --git a/src/vlibmemory/vlib_api.c b/src/vlibmemory/vlib_api.c
new file mode 100644
index 00000000000..9465cfc30d6
--- /dev/null
+++ b/src/vlibmemory/vlib_api.c
@@ -0,0 +1,750 @@
+/*
+ *------------------------------------------------------------------
+ * vlib_api.c VLIB API implementation
+ *
+ * Copyright (c) 2009 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <fcntl.h>
+#include <pthread.h>
+#include <vppinfra/vec.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/pool.h>
+#include <vppinfra/format.h>
+#include <vppinfra/byte_order.h>
+#include <vppinfra/elog.h>
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+
+/**
+ * @file
+ * @brief Binary API messaging via shared memory
+ * Low-level, primary provisioning interface
+ */
+/*? %%clicmd:group_label Binary API CLI %% ?*/
+/*? %%syscfg:group_label Binary API configuration %% ?*/
+
+#define TRACE_VLIB_MEMORY_QUEUE 0
+
+#include <vlibmemory/vl_memory_msg_enum.h>	/* enumerate all vlib messages */
+
+#define vl_typedefs		/* define message structures */
+#include <vlibmemory/vl_memory_api_h.h>
+#undef vl_typedefs
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vlibmemory/vl_memory_api_h.h>
+#undef vl_printfun
+
+static inline void *
+vl_api_trace_plugin_msg_ids_t_print (vl_api_trace_plugin_msg_ids_t * a,
+				     void *handle)
+{
+  vl_print (handle, "vl_api_trace_plugin_msg_ids: %s first %u last %u\n",
+	    a->plugin_name,
+	    clib_host_to_net_u16 (a->first_msg_id),
+	    clib_host_to_net_u16 (a->last_msg_id));
+  return handle;
+}
+
+/* instantiate all the endian swap functions we know about */
+#define vl_endianfun
+#include <vlibmemory/vl_memory_api_h.h>
+#undef vl_endianfun
+
+u8 *
+vl_api_serialize_message_table (api_main_t * am, u8 * vector)
+{
+  serialize_main_t _sm, *sm = &_sm;
+  hash_pair_t *hp;
+  u32 nmsg = hash_elts (am->msg_index_by_name_and_crc);
+
+  serialize_open_vector (sm, vector);
+
+  /* serialize the count */
+  serialize_integer (sm, nmsg, sizeof (u32));
+
+  /* *INDENT-OFF* */
+  hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
+  ({
+    serialize_likely_small_unsigned_integer (sm, hp->value[0]);
+    serialize_cstring (sm, (char *) hp->key);
+  }));
+  /* *INDENT-ON* */
+
+  return serialize_close_vector (sm);
+}
+
+static void
+vl_api_get_first_msg_id_t_handler (vl_api_get_first_msg_id_t * mp)
+{
+  vl_api_get_first_msg_id_reply_t *rmp;
+  vl_api_registration_t *regp;
+  uword *p;
+  api_main_t *am = &api_main;
+  vl_api_msg_range_t *rp;
+  u8 name[64];
+  u16 first_msg_id = ~0;
+  int rv = -7;			/* VNET_API_ERROR_INVALID_VALUE */
+
+  regp = vl_api_client_index_to_registration (mp->client_index);
+  if (!regp)
+    return;
+
+  if (am->msg_range_by_name == 0)
+    goto out;
+
+  strncpy ((char *) name, (char *) mp->name, ARRAY_LEN (name) - 1);
+
+  p = hash_get_mem (am->msg_range_by_name, name);
+  if (p == 0)
+    goto out;
+
+  rp = vec_elt_at_index (am->msg_ranges, p[0]);
+  first_msg_id = rp->first_msg_id;
+  rv = 0;
+
+out:
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID_REPLY);
+  rmp->context = mp->context;
+  rmp->retval = ntohl (rv);
+  rmp->first_msg_id = ntohs (first_msg_id);
+  vl_api_send_msg (regp, (u8 *) rmp);
+}
+
+void
+vl_api_api_versions_t_handler (vl_api_api_versions_t * mp)
+{
+  api_main_t *am = &api_main;
+  vl_api_api_versions_reply_t *rmp;
+  svm_queue_t *q;
+  u32 nmsg = vec_len (am->api_version_list);
+  int msg_size = sizeof (*rmp) + sizeof (rmp->api_versions[0]) * nmsg;
+  int i;
+
+  q = vl_api_client_index_to_input_queue (mp->client_index);
+  if (q == 0)
+    return;
+
+  rmp = vl_msg_api_alloc (msg_size);
+  memset (rmp, 0, msg_size);
+  rmp->_vl_msg_id = ntohs (VL_API_API_VERSIONS_REPLY);
+
+  /* fill in the message */
+  rmp->context = mp->context;
+  rmp->count = htonl (nmsg);
+
+  for (i = 0; i < nmsg; ++i)
+    {
+      api_version_t *vl = &am->api_version_list[i];
+      rmp->api_versions[i].major = htonl (vl->major);
+      rmp->api_versions[i].minor = htonl (vl->minor);
+      rmp->api_versions[i].patch = htonl (vl->patch);
+      strncpy ((char *) rmp->api_versions[i].name, vl->name, 64 - 1);
+    }
+
+  vl_msg_api_send_shmem (q, (u8 *) & rmp);
+}
+
+#define foreach_vlib_api_msg                            \
+_(GET_FIRST_MSG_ID, get_first_msg_id)                   \
+_(API_VERSIONS, api_versions)
+
+/*
+ * vl_api_init
+ */
+static int
+vlib_api_init (void)
+{
+  vl_msg_api_msg_config_t cfg;
+  vl_msg_api_msg_config_t *c = &cfg;
+
+  memset (c, 0, sizeof (*c));
+
+#define _(N,n) do {                                             \
+    c->id = VL_API_##N;                                         \
+    c->name = #n;                                               \
+    c->handler = vl_api_##n##_t_handler;                        \
+    c->cleanup = vl_noop_handler;                               \
+    c->endian = vl_api_##n##_t_endian;                          \
+    c->print = vl_api_##n##_t_print;                            \
+    c->size = sizeof(vl_api_##n##_t);                           \
+    c->traced = 1; /* trace, so these msgs print */             \
+    c->replay = 0; /* don't replay client create/delete msgs */ \
+    c->message_bounce = 0; /* don't bounce this message */	\
+    vl_msg_api_config(c);} while (0);
+
+  foreach_vlib_api_msg;
+#undef _
+
+  return 0;
+}
+
+u64 vector_rate_histogram[SLEEP_N_BUCKETS];
+
+/*
+ * Callback to send ourselves a plugin numbering-space trace msg
+ */
+static void
+send_one_plugin_msg_ids_msg (u8 * name, u16 first_msg_id, u16 last_msg_id)
+{
+  vl_api_trace_plugin_msg_ids_t *mp;
+  api_main_t *am = &api_main;
+  vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
+  svm_queue_t *q;
+
+  mp = vl_msg_api_alloc_as_if_client (sizeof (*mp));
+  memset (mp, 0, sizeof (*mp));
+
+  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_TRACE_PLUGIN_MSG_IDS);
+  strncpy ((char *) mp->plugin_name, (char *) name,
+	   sizeof (mp->plugin_name) - 1);
+  mp->first_msg_id = clib_host_to_net_u16 (first_msg_id);
+  mp->last_msg_id = clib_host_to_net_u16 (last_msg_id);
+
+  q = shmem_hdr->vl_input_queue;
+
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+}
+
+void
+vl_api_save_msg_table (void)
+{
+  u8 *serialized_message_table;
+  api_main_t *am = &api_main;
+  u8 *chroot_file;
+  int fd, rv;
+
+  /*
+   * Snapshoot the api message table.
+   */
+  if (strstr ((char *) am->save_msg_table_filename, "..")
+      || index ((char *) am->save_msg_table_filename, '/'))
+    {
+      clib_warning ("illegal save-message-table filename '%s'",
+		    am->save_msg_table_filename);
+      return;
+    }
+
+  chroot_file = format (0, "/tmp/%s%c", am->save_msg_table_filename, 0);
+
+  fd = creat ((char *) chroot_file, 0644);
+
+  if (fd < 0)
+    {
+      clib_unix_warning ("creat");
+      return;
+    }
+
+  serialized_message_table = vl_api_serialize_message_table (am, 0);
+
+  rv = write (fd, serialized_message_table,
+	      vec_len (serialized_message_table));
+
+  if (rv != vec_len (serialized_message_table))
+    clib_unix_warning ("write");
+
+  rv = close (fd);
+  if (rv < 0)
+    clib_unix_warning ("close");
+
+  vec_free (chroot_file);
+  vec_free (serialized_message_table);
+}
+
+static uword
+vl_api_clnt_process (vlib_main_t * vm, vlib_node_runtime_t * node,
+		     vlib_frame_t * f)
+{
+  int private_segment_rotor = 0, i, rv;
+  vl_socket_args_for_process_t *a;
+  vl_shmem_hdr_t *shm;
+  svm_queue_t *q;
+  clib_error_t *e;
+  api_main_t *am = &api_main;
+  f64 dead_client_scan_time;
+  f64 sleep_time, start_time;
+  f64 vector_rate;
+  clib_error_t *error;
+  uword event_type;
+  uword *event_data = 0;
+  f64 now;
+
+  if ((rv = vl_mem_api_init (am->region_name)) < 0)
+    {
+      clib_warning ("memory_api_init returned %d, quitting...", rv);
+      return 0;
+    }
+
+  if ((error = vl_sock_api_init (vm)))
+    {
+      clib_error_report (error);
+      clib_warning ("socksvr_api_init failed, quitting...");
+      return 0;
+    }
+
+  if ((rv = vlib_api_init ()) < 0)
+    {
+      clib_warning ("vlib_api_init returned %d, quitting...", rv);
+      return 0;
+    }
+
+  shm = am->shmem_hdr;
+  q = shm->vl_input_queue;
+
+  e = vlib_call_init_exit_functions
+    (vm, vm->api_init_function_registrations, 1 /* call_once */ );
+  if (e)
+    clib_error_report (e);
+
+  sleep_time = 10.0;
+  dead_client_scan_time = vlib_time_now (vm) + 10.0;
+
+  /*
+   * Send plugin message range messages for each plugin we loaded
+   */
+  for (i = 0; i < vec_len (am->msg_ranges); i++)
+    {
+      vl_api_msg_range_t *rp = am->msg_ranges + i;
+      send_one_plugin_msg_ids_msg (rp->name, rp->first_msg_id,
+				   rp->last_msg_id);
+    }
+
+  /*
+   * Save the api message table snapshot, if configured
+   */
+  if (am->save_msg_table_filename)
+    vl_api_save_msg_table ();
+
+  /* $$$ pay attention to frame size, control CPU usage */
+  while (1)
+    {
+      /*
+       * There's a reason for checking the queue before
+       * sleeping. If the vlib application crashes, it's entirely
+       * possible for a client to enqueue a connect request
+       * during the process restart interval.
+       *
+       * Unless some force of physics causes the new incarnation
+       * of the application to process the request, the client will
+       * sit and wait for Godot...
+       */
+      vector_rate = vlib_last_vector_length_per_node (vm);
+      start_time = vlib_time_now (vm);
+      while (1)
+	{
+	  if (vl_mem_api_handle_msg_main (vm, node))
+	    {
+	      vm->api_queue_nonempty = 0;
+	      VL_MEM_API_LOG_Q_LEN ("q-underflow: len %d", 0);
+	      sleep_time = 20.0;
+	      break;
+	    }
+
+	  /* Allow no more than 10us without a pause */
+	  if (vlib_time_now (vm) > start_time + 10e-6)
+	    {
+	      int index = SLEEP_400_US;
+	      if (vector_rate > 40.0)
+		sleep_time = 400e-6;
+	      else if (vector_rate > 20.0)
+		{
+		  index = SLEEP_200_US;
+		  sleep_time = 200e-6;
+		}
+	      else if (vector_rate >= 1.0)
+		{
+		  index = SLEEP_100_US;
+		  sleep_time = 100e-6;
+		}
+	      else
+		{
+		  index = SLEEP_10_US;
+		  sleep_time = 10e-6;
+		}
+	      vector_rate_histogram[index] += 1;
+	      break;
+	    }
+	}
+
+      /*
+       * see if we have any private api shared-memory segments
+       * If so, push required context variables, and process
+       * a message.
+       */
+      if (PREDICT_FALSE (vec_len (am->vlib_private_rps)))
+	{
+	  vl_mem_api_handle_msg_private (vm, node, private_segment_rotor++);
+	  if (private_segment_rotor >= vec_len (am->vlib_private_rps))
+	    private_segment_rotor = 0;
+	}
+
+      vlib_process_wait_for_event_or_clock (vm, sleep_time);
+      vec_reset_length (event_data);
+      event_type = vlib_process_get_events (vm, &event_data);
+      now = vlib_time_now (vm);
+
+      switch (event_type)
+	{
+	case QUEUE_SIGNAL_EVENT:
+	  vm->queue_signal_pending = 0;
+	  VL_MEM_API_LOG_Q_LEN ("q-awake: len %d", q->cursize);
+
+	  break;
+	case SOCKET_READ_EVENT:
+	  for (i = 0; i < vec_len (event_data); i++)
+	    {
+	      a = pool_elt_at_index (socket_main.process_args, event_data[i]);
+	      vl_socket_process_api_msg (a->clib_file, a->regp,
+					 (i8 *) a->data);
+	      vec_free (a->data);
+	      pool_put (socket_main.process_args, a);
+	    }
+	  break;
+
+	  /* Timeout... */
+	case -1:
+	  break;
+
+	default:
+	  clib_warning ("unknown event type %d", event_type);
+	  break;
+	}
+
+      if (now > dead_client_scan_time)
+	{
+	  vl_mem_api_dead_client_scan (am, shm, now);
+	  dead_client_scan_time = vlib_time_now (vm) + 10.0;
+	}
+    }
+
+  return 0;
+}
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (vl_api_clnt_node) =
+{
+  .function = vl_api_clnt_process,
+  .type = VLIB_NODE_TYPE_PROCESS,
+  .name = "api-rx-from-ring",
+  .state = VLIB_NODE_STATE_DISABLED,
+};
+/* *INDENT-ON* */
+
+void
+vl_mem_api_enable_disable (vlib_main_t * vm, int enable)
+{
+  vlib_node_set_state (vm, vl_api_clnt_node.index,
+		       (enable
+			? VLIB_NODE_STATE_POLLING
+			: VLIB_NODE_STATE_DISABLED));
+}
+
+static uword
+api_rx_from_node (vlib_main_t * vm,
+		  vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  uword n_packets = frame->n_vectors;
+  uword n_left_from;
+  u32 *from;
+  static u8 *long_msg;
+
+  vec_validate (long_msg, 4095);
+  n_left_from = frame->n_vectors;
+  from = vlib_frame_args (frame);
+
+  while (n_left_from > 0)
+    {
+      u32 bi0;
+      vlib_buffer_t *b0;
+      void *msg;
+      uword msg_len;
+
+      bi0 = from[0];
+      b0 = vlib_get_buffer (vm, bi0);
+      from += 1;
+      n_left_from -= 1;
+
+      msg = b0->data + b0->current_data;
+      msg_len = b0->current_length;
+      if (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
+	{
+	  ASSERT (long_msg != 0);
+	  _vec_len (long_msg) = 0;
+	  vec_add (long_msg, msg, msg_len);
+	  while (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
+	    {
+	      b0 = vlib_get_buffer (vm, b0->next_buffer);
+	      msg = b0->data + b0->current_data;
+	      msg_len = b0->current_length;
+	      vec_add (long_msg, msg, msg_len);
+	    }
+	  msg = long_msg;
+	}
+      vl_msg_api_handler_no_trace_no_free (msg);
+    }
+
+  /* Free what we've been given. */
+  vlib_buffer_free (vm, vlib_frame_args (frame), n_packets);
+
+  return n_packets;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (api_rx_from_node_node,static) = {
+    .function = api_rx_from_node,
+    .type = VLIB_NODE_TYPE_INTERNAL,
+    .vector_size = 4,
+    .name = "api-rx-from-node",
+};
+/* *INDENT-ON* */
+
+static void
+vl_api_rpc_call_t_handler (vl_api_rpc_call_t * mp)
+{
+  vl_api_rpc_call_reply_t *rmp;
+  int (*fp) (void *);
+  i32 rv = 0;
+  vlib_main_t *vm = vlib_get_main ();
+
+  if (mp->function == 0)
+    {
+      rv = -1;
+      clib_warning ("rpc NULL function pointer");
+    }
+
+  else
+    {
+      if (mp->need_barrier_sync)
+	vlib_worker_thread_barrier_sync (vm);
+
+      fp = uword_to_pointer (mp->function, int (*)(void *));
+      rv = fp (mp->data);
+
+      if (mp->need_barrier_sync)
+	vlib_worker_thread_barrier_release (vm);
+    }
+
+  if (mp->send_reply)
+    {
+      svm_queue_t *q = vl_api_client_index_to_input_queue (mp->client_index);
+      if (q)
+	{
+	  rmp = vl_msg_api_alloc_as_if_client (sizeof (*rmp));
+	  rmp->_vl_msg_id = ntohs (VL_API_RPC_CALL_REPLY);
+	  rmp->context = mp->context;
+	  rmp->retval = rv;
+	  vl_msg_api_send_shmem (q, (u8 *) & rmp);
+	}
+    }
+  if (mp->multicast)
+    {
+      clib_warning ("multicast not yet implemented...");
+    }
+}
+
+static void
+vl_api_rpc_call_reply_t_handler (vl_api_rpc_call_reply_t * mp)
+{
+  clib_warning ("unimplemented");
+}
+
+void
+vl_api_send_pending_rpc_requests (vlib_main_t * vm)
+{
+  api_main_t *am = &api_main;
+  vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
+  svm_queue_t *q;
+  int i;
+
+  /*
+   * Use the "normal" control-plane mechanism for the main thread.
+   * Well, almost. if the main input queue is full, we cannot
+   * block. Otherwise, we can expect a barrier sync timeout.
+   */
+  q = shmem_hdr->vl_input_queue;
+
+  for (i = 0; i < vec_len (vm->pending_rpc_requests); i++)
+    {
+      while (pthread_mutex_trylock (&q->mutex))
+	vlib_worker_thread_barrier_check ();
+
+      while (PREDICT_FALSE (svm_queue_is_full (q)))
+	{
+	  pthread_mutex_unlock (&q->mutex);
+	  vlib_worker_thread_barrier_check ();
+	  while (pthread_mutex_trylock (&q->mutex))
+	    vlib_worker_thread_barrier_check ();
+	}
+
+      vl_msg_api_send_shmem_nolock (q, (u8 *) (vm->pending_rpc_requests + i));
+
+      pthread_mutex_unlock (&q->mutex);
+    }
+  _vec_len (vm->pending_rpc_requests) = 0;
+}
+
+always_inline void
+vl_api_rpc_call_main_thread_inline (void *fp, u8 * data, u32 data_length,
+				    u8 force_rpc)
+{
+  vl_api_rpc_call_t *mp;
+  vlib_main_t *vm = vlib_get_main ();
+
+  /* Main thread and not a forced RPC: call the function directly */
+  if ((force_rpc == 0) && (vlib_get_thread_index () == 0))
+    {
+      void (*call_fp) (void *);
+
+      vlib_worker_thread_barrier_sync (vm);
+
+      call_fp = fp;
+      call_fp (data);
+
+      vlib_worker_thread_barrier_release (vm);
+      return;
+    }
+
+  /* Otherwise, actually do an RPC */
+  mp = vl_msg_api_alloc_as_if_client (sizeof (*mp) + data_length);
+
+  memset (mp, 0, sizeof (*mp));
+  clib_memcpy (mp->data, data, data_length);
+  mp->_vl_msg_id = ntohs (VL_API_RPC_CALL);
+  mp->function = pointer_to_uword (fp);
+  mp->need_barrier_sync = 1;
+
+  vec_add1 (vm->pending_rpc_requests, (uword) mp);
+}
+
+/*
+ * Check if called from worker threads.
+ * If so, make rpc call of fp through shmem.
+ * Otherwise, call fp directly
+ */
+void
+vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length)
+{
+  vl_api_rpc_call_main_thread_inline (fp, data, data_length,	/*force_rpc */
+				      0);
+}
+
+/*
+ * Always make rpc call of fp through shmem, useful for calling from threads
+ * not setup as worker threads, such as DPDK callback thread
+ */
+void
+vl_api_force_rpc_call_main_thread (void *fp, u8 * data, u32 data_length)
+{
+  vl_api_rpc_call_main_thread_inline (fp, data, data_length,	/*force_rpc */
+				      1);
+}
+
+static void
+vl_api_trace_plugin_msg_ids_t_handler (vl_api_trace_plugin_msg_ids_t * mp)
+{
+  api_main_t *am = &api_main;
+  vl_api_msg_range_t *rp;
+  uword *p;
+
+  /* Noop (except for tracing) during normal operation */
+  if (am->replay_in_progress == 0)
+    return;
+
+  p = hash_get_mem (am->msg_range_by_name, mp->plugin_name);
+  if (p == 0)
+    {
+      clib_warning ("WARNING: traced plugin '%s' not in current image",
+		    mp->plugin_name);
+      return;
+    }
+
+  rp = vec_elt_at_index (am->msg_ranges, p[0]);
+  if (rp->first_msg_id != clib_net_to_host_u16 (mp->first_msg_id))
+    {
+      clib_warning ("WARNING: traced plugin '%s' first message id %d not %d",
+		    mp->plugin_name, clib_net_to_host_u16 (mp->first_msg_id),
+		    rp->first_msg_id);
+    }
+
+  if (rp->last_msg_id != clib_net_to_host_u16 (mp->last_msg_id))
+    {
+      clib_warning ("WARNING: traced plugin '%s' last message id %d not %d",
+		    mp->plugin_name, clib_net_to_host_u16 (mp->last_msg_id),
+		    rp->last_msg_id);
+    }
+}
+
+#define foreach_rpc_api_msg                     \
+_(RPC_CALL,rpc_call)                            \
+_(RPC_CALL_REPLY,rpc_call_reply)
+
+#define foreach_plugin_trace_msg		\
+_(TRACE_PLUGIN_MSG_IDS,trace_plugin_msg_ids)
+
+/*
+ * Set the rpc callback at our earliest possible convenience.
+ * This avoids ordering issues between thread_init() -> start_workers and
+ * an init function which we could define here. If we ever intend to use
+ * vlib all by itself, we can't create a link-time dependency on
+ * an init function here and a typical "call foo_init first"
+ * guitar lick.
+ */
+
+extern void *rpc_call_main_thread_cb_fn;
+
+static clib_error_t *
+rpc_api_hookup (vlib_main_t * vm)
+{
+  api_main_t *am = &api_main;
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_noop_handler,			\
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 0 /* do not trace */);
+  foreach_rpc_api_msg;
+#undef _
+
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_noop_handler,			\
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1 /* do trace */);
+  foreach_plugin_trace_msg;
+#undef _
+
+  /* No reason to halt the parade to create a trace record... */
+  am->is_mp_safe[VL_API_TRACE_PLUGIN_MSG_IDS] = 1;
+  rpc_call_main_thread_cb_fn = vl_api_rpc_call_main_thread;
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (rpc_api_hookup);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */