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authorFlorin Coras <fcoras@cisco.com>2018-01-05 03:20:25 -0800
committerDave Barach <openvpp@barachs.net>2018-01-09 18:33:08 +0000
commite86a8edd3c14fb41ace2a12efd17bc7772bf623f (patch)
tree480219864cadd743fdb95c21379aeaf88a985e23 /src/vlibmemory/vlib_api.c
parent4363ad6c96b5641fca1b16c5a6ec22e2364adcfd (diff)
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>
Diffstat (limited to 'src/vlibmemory/vlib_api.c')
-rw-r--r--src/vlibmemory/vlib_api.c750
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:
+ */