SCTP stack (RFC4960)

== CONTENT ==
* SCTP chunks definition as per RFC4960;
* Helper functions to set/get values to/from the corresponding chunks;
* Hooks to the session/application layers;
* Complete state-machine handling;
* Implementation for unexpected chunk received in a certain
state (state-machine error handling)
* Support for 1-single connection;
* Sample application to test receive/transmit data-path;
* Test to validate SCTP stack;

Change-Id: I1b55c455ab400be9513f4e094dadfc3181d2ebc9
Signed-off-by: Marco Varlese <marco.varlese@suse.com>

1 files changed, 834 insertions, 0 deletions

diff --git a/src/vnet/sctp/builtin_client.c b/src/vnet/sctp/builtin_client.c
new file mode 100644
index 00000000000..4e50c0ae2ea
--- /dev/null
+++ b/src/vnet/sctp/builtin_client.c
@@ -0,0 +1,834 @@
+/*
+ * Copyright (c) 2018 SUSE LLC.
+ * 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 <vnet/vnet.h>
+#include <vnet/plugin/plugin.h>
+#include <vnet/sctp/builtin_client.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vpp/app/version.h>
+
+tclient_main_t tclient_main;
+
+#define SCTP_BUILTIN_CLIENT_DBG (0)
+
+static void
+signal_evt_to_cli_i (int *code)
+{
+  tclient_main_t *tm = &tclient_main;
+  ASSERT (vlib_get_thread_index () == 0);
+  vlib_process_signal_event (tm->vlib_main, tm->cli_node_index, *code, 0);
+}
+
+static void
+signal_evt_to_cli (int code)
+{
+  if (vlib_get_thread_index () != 0)
+    vl_api_rpc_call_main_thread (signal_evt_to_cli_i, (u8 *) & code,
+				 sizeof (code));
+  else
+    signal_evt_to_cli_i (&code);
+}
+
+static void
+send_test_chunk (tclient_main_t * tm, session_t * s)
+{
+  u8 *test_data = tm->connect_test_data;
+  int test_buf_offset;
+  u32 bytes_this_chunk;
+  session_fifo_event_t evt;
+  svm_fifo_t *txf;
+  int rv;
+
+  ASSERT (vec_len (test_data) > 0);
+
+  test_buf_offset = s->bytes_sent % vec_len (test_data);
+  bytes_this_chunk = vec_len (test_data) - test_buf_offset;
+  bytes_this_chunk = bytes_this_chunk < s->bytes_to_send
+    ? bytes_this_chunk : s->bytes_to_send;
+
+  txf = s->server_tx_fifo;
+  rv = svm_fifo_enqueue_nowait (txf, bytes_this_chunk,
+				test_data + test_buf_offset);
+
+  /* If we managed to enqueue data... */
+  if (rv > 0)
+    {
+      /* Account for it... */
+      s->bytes_to_send -= rv;
+      s->bytes_sent += rv;
+
+      if (SCTP_BUILTIN_CLIENT_DBG)
+	{
+          /* *INDENT-OFF* */
+          ELOG_TYPE_DECLARE (e) =
+            {
+              .format = "tx-enq: xfer %d bytes, sent %u remain %u",
+              .format_args = "i4i4i4",
+            };
+          /* *INDENT-ON* */
+	  struct
+	  {
+	    u32 data[3];
+	  } *ed;
+	  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
+	  ed->data[0] = rv;
+	  ed->data[1] = s->bytes_sent;
+	  ed->data[2] = s->bytes_to_send;
+	}
+
+      /* Poke the session layer */
+      if (svm_fifo_set_event (txf))
+	{
+	  /* Fabricate TX event, send to vpp */
+	  evt.fifo = txf;
+	  evt.event_type = FIFO_EVENT_APP_TX;
+
+	  if (svm_queue_add
+	      (tm->vpp_event_queue[txf->master_thread_index], (u8 *) & evt,
+	       0 /* do wait for mutex */ ))
+	    clib_warning ("could not enqueue event");
+	}
+    }
+}
+
+static void
+receive_test_chunk (tclient_main_t * tm, session_t * s)
+{
+  svm_fifo_t *rx_fifo = s->server_rx_fifo;
+  u32 my_thread_index = vlib_get_thread_index ();
+  int n_read, i;
+
+  /* Allow enqueuing of new event */
+  // svm_fifo_unset_event (rx_fifo);
+
+  if (tm->test_bytes)
+    {
+      n_read = svm_fifo_dequeue_nowait (rx_fifo,
+					vec_len (tm->rx_buf[my_thread_index]),
+					tm->rx_buf[my_thread_index]);
+    }
+  else
+    {
+      n_read = svm_fifo_max_dequeue (rx_fifo);
+      svm_fifo_dequeue_drop (rx_fifo, n_read);
+    }
+
+  if (SCTP_BUILTIN_CLIENT_DBG)
+    clib_warning ("Receiving test chunk; n_read = %d", n_read);
+
+  if (n_read > 0)
+    {
+      if (SCTP_BUILTIN_CLIENT_DBG)
+	{
+          /* *INDENT-OFF* */
+          ELOG_TYPE_DECLARE (e) =
+            {
+              .format = "rx-deq: %d bytes",
+              .format_args = "i4",
+            };
+          /* *INDENT-ON* */
+	  struct
+	  {
+	    u32 data[1];
+	  } *ed;
+	  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
+	  ed->data[0] = n_read;
+	}
+
+      if (tm->test_bytes)
+	{
+	  for (i = 0; i < n_read; i++)
+	    {
+	      if (tm->rx_buf[my_thread_index][i]
+		  != ((s->bytes_received + i) & 0xff))
+		{
+		  clib_warning ("read %d error at byte %lld, 0x%x not 0x%x",
+				n_read, s->bytes_received + i,
+				tm->rx_buf[my_thread_index][i],
+				((s->bytes_received + i) & 0xff));
+		  tm->test_failed = 1;
+		}
+	    }
+	}
+
+      if (s->bytes_to_receive < n_read)
+	{
+	  s->bytes_to_receive = 0;
+	  s->bytes_received += s->bytes_received;
+	}
+      else
+	{
+	  s->bytes_to_receive -= n_read;
+	  s->bytes_received += n_read;
+	}
+    }
+}
+
+static uword
+builtin_client_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+			vlib_frame_t * frame)
+{
+  tclient_main_t *tm = &tclient_main;
+  int my_thread_index = vlib_get_thread_index ();
+  session_t *sp;
+  int i;
+  int delete_session;
+  u32 *connection_indices;
+  u32 *connections_this_batch;
+  u32 nconnections_this_batch;
+
+  connection_indices = tm->connection_index_by_thread[my_thread_index];
+  connections_this_batch =
+    tm->connections_this_batch_by_thread[my_thread_index];
+
+  if ((tm->run_test == 0) ||
+      ((vec_len (connection_indices) == 0)
+       && vec_len (connections_this_batch) == 0))
+    return 0;
+
+  /* Grab another pile of connections */
+  if (PREDICT_FALSE (vec_len (connections_this_batch) == 0))
+    {
+      nconnections_this_batch =
+	clib_min (tm->connections_per_batch, vec_len (connection_indices));
+
+      ASSERT (nconnections_this_batch > 0);
+      vec_validate (connections_this_batch, nconnections_this_batch - 1);
+      clib_memcpy (connections_this_batch,
+		   connection_indices + vec_len (connection_indices)
+		   - nconnections_this_batch,
+		   nconnections_this_batch * sizeof (u32));
+      _vec_len (connection_indices) -= nconnections_this_batch;
+    }
+
+  if (PREDICT_FALSE (tm->prev_conns != tm->connections_per_batch
+		     && tm->prev_conns == vec_len (connections_this_batch)))
+    {
+      tm->repeats++;
+      tm->prev_conns = vec_len (connections_this_batch);
+      if (tm->repeats == 500000)
+	{
+	  clib_warning ("stuck clients");
+	}
+    }
+  else
+    {
+      tm->prev_conns = vec_len (connections_this_batch);
+      tm->repeats = 0;
+    }
+
+  for (i = 0; i < vec_len (connections_this_batch); i++)
+    {
+      delete_session = 1;
+
+      sp = pool_elt_at_index (tm->sessions, connections_this_batch[i]);
+
+      if (sp->bytes_to_send > 0)
+	{
+	  send_test_chunk (tm, sp);
+	  delete_session = 0;
+	}
+
+      if (sp->bytes_to_receive > 0)
+	{
+	  receive_test_chunk (tm, sp);
+	  delete_session = 0;
+	}
+      if (PREDICT_FALSE (delete_session == 1))
+	{
+	  u32 index, thread_index;
+	  stream_session_t *s;
+
+	  __sync_fetch_and_add (&tm->tx_total, sp->bytes_sent);
+	  __sync_fetch_and_add (&tm->rx_total, sp->bytes_received);
+
+	  session_parse_handle (sp->vpp_session_handle,
+				&index, &thread_index);
+	  s = session_get_if_valid (index, thread_index);
+
+	  if (s)
+	    {
+	      vnet_disconnect_args_t _a, *a = &_a;
+	      a->handle = session_handle (s);
+	      a->app_index = tm->app_index;
+	      vnet_disconnect_session (a);
+
+	      vec_delete (connections_this_batch, 1, i);
+	      i--;
+	      __sync_fetch_and_add (&tm->ready_connections, -1);
+	    }
+	  else
+	    clib_warning ("session AWOL?");
+
+	  /* Kick the debug CLI process */
+	  if (tm->ready_connections == 0)
+	    {
+	      signal_evt_to_cli (2);
+	    }
+	}
+    }
+
+  tm->connection_index_by_thread[my_thread_index] = connection_indices;
+  tm->connections_this_batch_by_thread[my_thread_index] =
+    connections_this_batch;
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (builtin_sctp_client_node) =
+{
+  .function = builtin_client_node_fn,
+  .name = "builtin-sctp-client",
+  .type = VLIB_NODE_TYPE_INPUT,
+  .state = VLIB_NODE_STATE_DISABLED,
+};
+/* *INDENT-ON* */
+
+static int
+create_api_loopback (tclient_main_t * tm)
+{
+  api_main_t *am = &api_main;
+  vl_shmem_hdr_t *shmem_hdr;
+
+  shmem_hdr = am->shmem_hdr;
+  tm->vl_input_queue = shmem_hdr->vl_input_queue;
+  tm->my_client_index =
+    vl_api_memclnt_create_internal ("sctp_test_client", tm->vl_input_queue);
+  return 0;
+}
+
+static int
+sctp_test_clients_init (vlib_main_t * vm)
+{
+  tclient_main_t *tm = &tclient_main;
+  vlib_thread_main_t *vtm = vlib_get_thread_main ();
+  u32 num_threads;
+  int i;
+
+  if (create_api_loopback (tm))
+    return -1;
+
+  num_threads = 1 /* main thread */  + vtm->n_threads;
+
+  /* Init test data. Big buffer */
+  vec_validate (tm->connect_test_data, 1024 * 1024 - 1);
+  for (i = 0; i < vec_len (tm->connect_test_data); i++)
+    tm->connect_test_data[i] = i & 0xff;
+
+  vec_validate (tm->rx_buf, num_threads - 1);
+  for (i = 0; i < num_threads; i++)
+    vec_validate (tm->rx_buf[i], vec_len (tm->connect_test_data) - 1);
+
+  tm->is_init = 1;
+
+  vec_validate (tm->connection_index_by_thread, vtm->n_vlib_mains);
+  vec_validate (tm->connections_this_batch_by_thread, vtm->n_vlib_mains);
+  vec_validate (tm->vpp_event_queue, vtm->n_vlib_mains);
+
+  return 0;
+}
+
+static int
+builtin_session_connected_callback (u32 app_index, u32 api_context,
+				    stream_session_t * s, u8 is_fail)
+{
+  tclient_main_t *tm = &tclient_main;
+  session_t *session;
+  u32 session_index;
+  u8 thread_index = vlib_get_thread_index ();
+
+  if (is_fail)
+    {
+      clib_warning ("connection %d failed!", api_context);
+      signal_evt_to_cli (-1);
+      return 0;
+    }
+
+  ASSERT (s->thread_index == thread_index);
+
+  if (!tm->vpp_event_queue[thread_index])
+    tm->vpp_event_queue[thread_index] =
+      session_manager_get_vpp_event_queue (thread_index);
+
+  /*
+   * Setup session
+   */
+  clib_spinlock_lock_if_init (&tm->sessions_lock);
+  pool_get (tm->sessions, session);
+  clib_spinlock_unlock_if_init (&tm->sessions_lock);
+
+  memset (session, 0, sizeof (*session));
+  session_index = session - tm->sessions;
+  session->bytes_to_send = tm->bytes_to_send;
+  session->bytes_to_receive = tm->no_return ? 0ULL : tm->bytes_to_send;
+  session->server_rx_fifo = s->server_rx_fifo;
+  session->server_rx_fifo->client_session_index = session_index;
+  session->server_tx_fifo = s->server_tx_fifo;
+  session->server_tx_fifo->client_session_index = session_index;
+  session->vpp_session_handle = session_handle (s);
+
+  vec_add1 (tm->connection_index_by_thread[thread_index], session_index);
+  __sync_fetch_and_add (&tm->ready_connections, 1);
+  if (tm->ready_connections == tm->expected_connections)
+    {
+      tm->run_test = 1;
+      /* Signal the CLI process that the action is starting... */
+      signal_evt_to_cli (1);
+    }
+
+  return 0;
+}
+
+static void
+builtin_session_reset_callback (stream_session_t * s)
+{
+  if (s->session_state == SESSION_STATE_READY)
+    clib_warning ("Reset active connection %U", format_stream_session, s, 2);
+  stream_session_cleanup (s);
+  return;
+}
+
+static int
+builtin_session_create_callback (stream_session_t * s)
+{
+  return 0;
+}
+
+static void
+builtin_session_disconnect_callback (stream_session_t * s)
+{
+  tclient_main_t *tm = &tclient_main;
+  vnet_disconnect_args_t _a, *a = &_a;
+  a->handle = session_handle (s);
+  a->app_index = tm->app_index;
+  vnet_disconnect_session (a);
+  return;
+}
+
+static int
+builtin_server_rx_callback (stream_session_t * s)
+{
+  return 0;
+}
+
+/* *INDENT-OFF* */
+static session_cb_vft_t builtin_clients = {
+  .session_reset_callback = builtin_session_reset_callback,
+  .session_connected_callback = builtin_session_connected_callback,
+  .session_accept_callback = builtin_session_create_callback,
+  .session_disconnect_callback = builtin_session_disconnect_callback,
+  .builtin_server_rx_callback = builtin_server_rx_callback
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+attach_builtin_test_clients_app (u8 * appns_id, u64 appns_flags,
+				 u64 appns_secret)
+{
+  u32 segment_name_length, prealloc_fifos, segment_size = 2 << 20;
+  tclient_main_t *tm = &tclient_main;
+  vnet_app_attach_args_t _a, *a = &_a;
+  u8 segment_name[128];
+  u64 options[16];
+  clib_error_t *error = 0;
+
+  segment_name_length = ARRAY_LEN (segment_name);
+
+  memset (a, 0, sizeof (*a));
+  memset (options, 0, sizeof (options));
+
+  a->api_client_index = tm->my_client_index;
+  a->segment_name = segment_name;
+  a->segment_name_length = segment_name_length;
+  a->session_cb_vft = &builtin_clients;
+
+  prealloc_fifos = tm->prealloc_fifos ? tm->expected_connections : 1;
+
+  if (tm->private_segment_size)
+    segment_size = tm->private_segment_size;
+
+  options[APP_OPTIONS_ACCEPT_COOKIE] = 0x12345678;
+  options[APP_OPTIONS_SEGMENT_SIZE] = segment_size;
+  options[APP_OPTIONS_RX_FIFO_SIZE] = tm->fifo_size;
+  options[APP_OPTIONS_TX_FIFO_SIZE] = tm->fifo_size;
+  options[APP_OPTIONS_PRIVATE_SEGMENT_COUNT] = tm->private_segment_count;
+  options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] = prealloc_fifos;
+
+  options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_IS_BUILTIN;
+  if (appns_id)
+    {
+      options[APP_OPTIONS_FLAGS] |= appns_flags;
+      options[APP_OPTIONS_NAMESPACE_SECRET] = appns_secret;
+    }
+  a->options = options;
+  a->namespace_id = appns_id;
+
+  if ((error = vnet_application_attach (a)))
+    return error;
+
+  tm->app_index = a->app_index;
+  return 0;
+}
+
+static void *
+tclient_thread_fn (void *arg)
+{
+  return 0;
+}
+
+/** Start a transmit thread */
+int
+start_tx_pthread_sctp (tclient_main_t * tm)
+{
+  if (tm->client_thread_handle == 0)
+    {
+      int rv = pthread_create (&tm->client_thread_handle,
+			       NULL /*attr */ ,
+			       tclient_thread_fn, 0);
+      if (rv)
+	{
+	  tm->client_thread_handle = 0;
+	  return -1;
+	}
+    }
+  return 0;
+}
+
+clib_error_t *
+clients_connect_sctp (vlib_main_t * vm, u8 * uri, u32 n_clients)
+{
+  tclient_main_t *tm = &tclient_main;
+  vnet_connect_args_t _a, *a = &_a;
+  clib_error_t *error = 0;
+  int i;
+  for (i = 0; i < n_clients; i++)
+    {
+      memset (a, 0, sizeof (*a));
+
+      a->uri = (char *) uri;
+      a->api_context = i;
+      a->app_index = tm->app_index;
+      a->mp = 0;
+
+      if ((error = vnet_connect_uri (a)))
+	return error;
+
+
+      /* Crude pacing for call setups  */
+      if ((i % 4) == 0)
+	vlib_process_suspend (vm, 10e-6);
+      ASSERT (i + 1 >= tm->ready_connections);
+      while (i + 1 - tm->ready_connections > 1000)
+	{
+	  vlib_process_suspend (vm, 100e-6);
+	}
+    }
+  return 0;
+}
+
+#define CLI_OUTPUT(_fmt, _args...) 			\
+  if (!tm->no_output)  					\
+    vlib_cli_output(vm, _fmt, ##_args)
+
+static clib_error_t *
+test_sctp_clients_command_fn (vlib_main_t * vm,
+			      unformat_input_t * input,
+			      vlib_cli_command_t * cmd)
+{
+  tclient_main_t *tm = &tclient_main;
+  vlib_thread_main_t *thread_main = vlib_get_thread_main ();
+  uword *event_data = 0, event_type;
+  u8 *default_connect_uri = (u8 *) "sctp://6.0.1.1/1234", *uri, *appns_id = 0;
+  u64 tmp, total_bytes, appns_flags = 0, appns_secret = 0;
+  f64 test_timeout = 20.0, syn_timeout = 20.0, delta;
+  f64 time_before_connects;
+  u32 n_clients = 1;
+  int preallocate_sessions = 0;
+  char *transfer_type;
+  clib_error_t *error = 0;
+  int i;
+
+  tm->bytes_to_send = 8192;
+  tm->no_return = 0;
+  tm->fifo_size = 64 << 10;
+  tm->connections_per_batch = 1000;
+  tm->private_segment_count = 0;
+  tm->private_segment_size = 0;
+  tm->no_output = 0;
+  tm->test_bytes = 0;
+  tm->test_failed = 0;
+  tm->vlib_main = vm;
+  if (thread_main->n_vlib_mains > 1)
+    clib_spinlock_init (&tm->sessions_lock);
+  vec_free (tm->connect_uri);
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "nclients %d", &n_clients))
+	;
+      else if (unformat (input, "mbytes %lld", &tmp))
+	tm->bytes_to_send = tmp << 20;
+      else if (unformat (input, "gbytes %lld", &tmp))
+	tm->bytes_to_send = tmp << 30;
+      else if (unformat (input, "bytes %lld", &tm->bytes_to_send))
+	;
+      else if (unformat (input, "uri %s", &tm->connect_uri))
+	;
+      else if (unformat (input, "test-timeout %f", &test_timeout))
+	;
+      else if (unformat (input, "syn-timeout %f", &syn_timeout))
+	;
+      else if (unformat (input, "no-return"))
+	tm->no_return = 1;
+      else if (unformat (input, "fifo-size %d", &tm->fifo_size))
+	tm->fifo_size <<= 10;
+      else if (unformat (input, "private-segment-count %d",
+			 &tm->private_segment_count))
+	;
+      else if (unformat (input, "private-segment-size %U",
+			 unformat_memory_size, &tmp))
+	{
+	  if (tmp >= 0x100000000ULL)
+	    return clib_error_return
+	      (0, "private segment size %lld (%llu) too large", tmp, tmp);
+	  tm->private_segment_size = tmp;
+	}
+      else if (unformat (input, "preallocate-fifos"))
+	tm->prealloc_fifos = 1;
+      else if (unformat (input, "preallocate-sessions"))
+	preallocate_sessions = 1;
+      else
+	if (unformat (input, "client-batch %d", &tm->connections_per_batch))
+	;
+      else if (unformat (input, "appns %_%v%_", &appns_id))
+	;
+      else if (unformat (input, "all-scope"))
+	appns_flags |= (APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE
+			| APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE);
+      else if (unformat (input, "local-scope"))
+	appns_flags = APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE;
+      else if (unformat (input, "global-scope"))
+	appns_flags = APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
+      else if (unformat (input, "secret %lu", &appns_secret))
+	;
+      else if (unformat (input, "no-output"))
+	tm->no_output = 1;
+      else if (unformat (input, "test-bytes"))
+	tm->test_bytes = 1;
+      else
+	return clib_error_return (0, "unknown input `%U'",
+				  format_unformat_error, input);
+    }
+
+  /* Store cli process node index for signalling */
+  tm->cli_node_index = vlib_get_current_process (vm)->node_runtime.node_index;
+
+  if (tm->is_init == 0)
+    {
+      if (sctp_test_clients_init (vm))
+	return clib_error_return (0, "failed init");
+    }
+
+  tm->ready_connections = 0;
+  tm->expected_connections = n_clients;
+  tm->rx_total = 0;
+  tm->tx_total = 0;
+
+  uri = default_connect_uri;
+  if (tm->connect_uri)
+    uri = tm->connect_uri;
+
+#if SCTP_BUILTIN_CLIENT_PTHREAD
+  start_tx_pthread ();
+#endif
+
+  vlib_worker_thread_barrier_sync (vm);
+  vnet_session_enable_disable (vm, 1 /* turn on SCTP, etc. */ );
+  vlib_worker_thread_barrier_release (vm);
+
+  if (tm->test_client_attached == 0)
+    {
+      if ((error = attach_builtin_test_clients_app (appns_id, appns_flags,
+						    appns_secret)))
+	{
+	  vec_free (appns_id);
+	  clib_error_report (error);
+	  return error;
+	}
+      vec_free (appns_id);
+    }
+  tm->test_client_attached = 1;
+
+  /* Turn on the builtin client input nodes */
+  for (i = 0; i < thread_main->n_vlib_mains; i++)
+    vlib_node_set_state (vlib_mains[i], builtin_sctp_client_node.index,
+			 VLIB_NODE_STATE_POLLING);
+
+  if (preallocate_sessions)
+    {
+      session_t *sp __attribute__ ((unused));
+      for (i = 0; i < n_clients; i++)
+	pool_get (tm->sessions, sp);
+      for (i = 0; i < n_clients; i++)
+	pool_put_index (tm->sessions, i);
+    }
+
+  /* Fire off connect requests */
+  time_before_connects = vlib_time_now (vm);
+  if ((error = clients_connect_sctp (vm, uri, n_clients)))
+    return error;
+
+  /* Park until the sessions come up, or ten seconds elapse... */
+  vlib_process_wait_for_event_or_clock (vm, syn_timeout);
+
+  event_type = vlib_process_get_events (vm, &event_data);
+  switch (event_type)
+    {
+    case ~0:
+      CLI_OUTPUT ("Timeout with only %d sessions active...",
+		  tm->ready_connections);
+      error =
+	clib_error_return (0, "failed: syn timeout (%f) with %d sessions",
+			   syn_timeout, tm->ready_connections);
+      goto cleanup;
+
+    case 1:
+      delta = vlib_time_now (vm) - time_before_connects;
+      if (delta != 0.0)
+	CLI_OUTPUT ("%d three-way handshakes in %.2f seconds %.2f/s",
+		    n_clients, delta, ((f64) n_clients) / delta);
+
+      tm->test_start_time = vlib_time_now (tm->vlib_main);
+      CLI_OUTPUT ("Test started at %.6f", tm->test_start_time);
+      break;
+
+    default:
+      CLI_OUTPUT ("unexpected event(1): %d", event_type);
+      error = clib_error_return (0, "failed: unexpected event(1): %d",
+				 event_type);
+      goto cleanup;
+    }
+
+  /* Now wait for the sessions to finish... */
+  vlib_process_wait_for_event_or_clock (vm, test_timeout);
+  event_type = vlib_process_get_events (vm, &event_data);
+  switch (event_type)
+    {
+    case ~0:
+      CLI_OUTPUT ("Timeout with %d sessions still active...",
+		  tm->ready_connections);
+      error = clib_error_return (0, "failed: timeout with %d sessions",
+				 tm->ready_connections);
+      goto cleanup;
+
+    case 2:
+      tm->test_end_time = vlib_time_now (vm);
+      CLI_OUTPUT ("Test finished at %.6f", tm->test_end_time);
+      break;
+
+    default:
+      CLI_OUTPUT ("unexpected event(2): %d", event_type);
+      error = clib_error_return (0, "failed: unexpected event(2): %d",
+				 event_type);
+      goto cleanup;
+    }
+
+  delta = tm->test_end_time - tm->test_start_time;
+
+  if (delta != 0.0)
+    {
+      total_bytes = (tm->no_return ? tm->tx_total : tm->rx_total);
+      transfer_type = tm->no_return ? "half-duplex" : "full-duplex";
+      CLI_OUTPUT ("%lld bytes (%lld mbytes, %lld gbytes) in %.2f seconds",
+		  total_bytes, total_bytes / (1ULL << 20),
+		  total_bytes / (1ULL << 30), delta);
+      CLI_OUTPUT ("%.2f bytes/second %s", ((f64) total_bytes) / (delta),
+		  transfer_type);
+      CLI_OUTPUT ("%.4f gbit/second %s",
+		  (((f64) total_bytes * 8.0) / delta / 1e9), transfer_type);
+    }
+  else
+    {
+      CLI_OUTPUT ("zero delta-t?");
+      error = clib_error_return (0, "failed: zero delta-t");
+      goto cleanup;
+    }
+
+  if (tm->test_bytes && tm->test_failed)
+    error = clib_error_return (0, "failed: test bytes");
+
+cleanup:
+  tm->run_test = 0;
+  for (i = 0; i < vec_len (tm->connection_index_by_thread); i++)
+    {
+      vec_reset_length (tm->connection_index_by_thread[i]);
+      vec_reset_length (tm->connections_this_batch_by_thread[i]);
+    }
+
+  pool_free (tm->sessions);
+
+  /* Detach the application, so we can use different fifo sizes next time */
+  if (tm->test_client_attached)
+    {
+      vnet_app_detach_args_t _da, *da = &_da;
+      int rv;
+
+      da->app_index = tm->app_index;
+      rv = vnet_application_detach (da);
+      if (rv)
+	{
+	  error = clib_error_return (0, "failed: app detach");
+	  CLI_OUTPUT ("WARNING: app detach failed...");
+	}
+      tm->test_client_attached = 0;
+      tm->app_index = ~0;
+    }
+  if (error)
+    CLI_OUTPUT ("test failed");
+  return error;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (test_clients_command, static) =
+{
+  .path = "test sctp clients",
+  .short_help = "test sctp clients [nclients %d] [[m|g]bytes <bytes>] "
+      "[test-timeout <time>][syn-timeout <time>][no-return][fifo-size <size>]"
+      "[private-segment-count <count>][private-segment-size <bytes>[m|g]]"
+      "[preallocate-fifos][preallocate-sessions][client-batch <batch-size>]"
+      "[uri <sctp://ip/port>][test-bytes][no-output]",
+  .function = test_sctp_clients_command_fn,
+  .is_mp_safe = 1,
+};
+/* *INDENT-ON* */
+
+clib_error_t *
+sctp_test_clients_main_init (vlib_main_t * vm)
+{
+  tclient_main_t *tm = &tclient_main;
+  tm->is_init = 0;
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (sctp_test_clients_main_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */