hsa: move session-apps to host-stack apps plugin

Type:refactor

Change-Id: I114fea3a54258797e961d8627a99ba2098674d20
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 1038 insertions, 0 deletions

diff --git a/src/plugins/hs_apps/echo_client.c b/src/plugins/hs_apps/echo_client.c
new file mode 100644
index 00000000000..bcf4176ca71
--- /dev/null
+++ b/src/plugins/hs_apps/echo_client.c
@@ -0,0 +1,1038 @@
+/*
+ * echo_client.c - vpp built-in echo client code
+ *
+ * Copyright (c) 2017-2019 by 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 <vnet/vnet.h>
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <hs_apps/echo_client.h>
+
+echo_client_main_t echo_client_main;
+
+#define ECHO_CLIENT_DBG (0)
+#define DBG(_fmt, _args...)			\
+    if (ECHO_CLIENT_DBG) 				\
+      clib_warning (_fmt, ##_args)
+
+static void
+signal_evt_to_cli_i (int *code)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  ASSERT (vlib_get_thread_index () == 0);
+  vlib_process_signal_event (ecm->vlib_main, ecm->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_data_chunk (echo_client_main_t * ecm, eclient_session_t * s)
+{
+  u8 *test_data = ecm->connect_test_data;
+  int test_buf_len, test_buf_offset, rv;
+  u32 bytes_this_chunk;
+
+  test_buf_len = vec_len (test_data);
+  ASSERT (test_buf_len > 0);
+  test_buf_offset = s->bytes_sent % test_buf_len;
+  bytes_this_chunk = clib_min (test_buf_len - test_buf_offset,
+			       s->bytes_to_send);
+
+  if (!ecm->is_dgram)
+    {
+      if (ecm->no_copy)
+	{
+	  svm_fifo_t *f = s->data.tx_fifo;
+	  rv = clib_min (svm_fifo_max_enqueue_prod (f), bytes_this_chunk);
+	  svm_fifo_enqueue_nocopy (f, rv);
+	  session_send_io_evt_to_thread_custom (&f->master_session_index,
+						s->thread_index,
+						SESSION_IO_EVT_TX);
+	}
+      else
+	rv = app_send_stream (&s->data, test_data + test_buf_offset,
+			      bytes_this_chunk, 0);
+    }
+  else
+    {
+      if (ecm->no_copy)
+	{
+	  session_dgram_hdr_t hdr;
+	  svm_fifo_t *f = s->data.tx_fifo;
+	  app_session_transport_t *at = &s->data.transport;
+	  u32 max_enqueue = svm_fifo_max_enqueue_prod (f);
+
+	  if (max_enqueue <= sizeof (session_dgram_hdr_t))
+	    return;
+
+	  max_enqueue -= sizeof (session_dgram_hdr_t);
+	  rv = clib_min (max_enqueue, bytes_this_chunk);
+
+	  hdr.data_length = rv;
+	  hdr.data_offset = 0;
+	  clib_memcpy_fast (&hdr.rmt_ip, &at->rmt_ip,
+			    sizeof (ip46_address_t));
+	  hdr.is_ip4 = at->is_ip4;
+	  hdr.rmt_port = at->rmt_port;
+	  clib_memcpy_fast (&hdr.lcl_ip, &at->lcl_ip,
+			    sizeof (ip46_address_t));
+	  hdr.lcl_port = at->lcl_port;
+	  svm_fifo_enqueue (f, sizeof (hdr), (u8 *) & hdr);
+	  svm_fifo_enqueue_nocopy (f, rv);
+	  session_send_io_evt_to_thread_custom (&f->master_session_index,
+						s->thread_index,
+						SESSION_IO_EVT_TX);
+	}
+      else
+	rv = app_send_dgram (&s->data, test_data + test_buf_offset,
+			     bytes_this_chunk, 0);
+    }
+
+  /* If we managed to enqueue data... */
+  if (rv > 0)
+    {
+      /* Account for it... */
+      s->bytes_to_send -= rv;
+      s->bytes_sent += rv;
+
+      if (ECHO_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;
+	}
+    }
+}
+
+static void
+receive_data_chunk (echo_client_main_t * ecm, eclient_session_t * s)
+{
+  svm_fifo_t *rx_fifo = s->data.rx_fifo;
+  u32 thread_index = vlib_get_thread_index ();
+  int n_read, i;
+
+  if (ecm->test_bytes)
+    {
+      if (!ecm->is_dgram)
+	n_read = app_recv_stream (&s->data, ecm->rx_buf[thread_index],
+				  vec_len (ecm->rx_buf[thread_index]));
+      else
+	n_read = app_recv_dgram (&s->data, ecm->rx_buf[thread_index],
+				 vec_len (ecm->rx_buf[thread_index]));
+    }
+  else
+    {
+      n_read = svm_fifo_max_dequeue_cons (rx_fifo);
+      svm_fifo_dequeue_drop (rx_fifo, n_read);
+    }
+
+  if (n_read > 0)
+    {
+      if (ECHO_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 (ecm->test_bytes)
+	{
+	  for (i = 0; i < n_read; i++)
+	    {
+	      if (ecm->rx_buf[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,
+				ecm->rx_buf[thread_index][i],
+				((s->bytes_received + i) & 0xff));
+		  ecm->test_failed = 1;
+		}
+	    }
+	}
+      ASSERT (n_read <= s->bytes_to_receive);
+      s->bytes_to_receive -= n_read;
+      s->bytes_received += n_read;
+    }
+}
+
+static uword
+echo_client_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+		     vlib_frame_t * frame)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  int my_thread_index = vlib_get_thread_index ();
+  eclient_session_t *sp;
+  int i;
+  int delete_session;
+  u32 *connection_indices;
+  u32 *connections_this_batch;
+  u32 nconnections_this_batch;
+
+  connection_indices = ecm->connection_index_by_thread[my_thread_index];
+  connections_this_batch =
+    ecm->connections_this_batch_by_thread[my_thread_index];
+
+  if ((ecm->run_test != ECHO_CLIENTS_RUNNING) ||
+      ((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 (ecm->connections_per_batch, vec_len (connection_indices));
+
+      ASSERT (nconnections_this_batch > 0);
+      vec_validate (connections_this_batch, nconnections_this_batch - 1);
+      clib_memcpy_fast (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 (ecm->prev_conns != ecm->connections_per_batch
+		     && ecm->prev_conns == vec_len (connections_this_batch)))
+    {
+      ecm->repeats++;
+      ecm->prev_conns = vec_len (connections_this_batch);
+      if (ecm->repeats == 500000)
+	{
+	  clib_warning ("stuck clients");
+	}
+    }
+  else
+    {
+      ecm->prev_conns = vec_len (connections_this_batch);
+      ecm->repeats = 0;
+    }
+
+  for (i = 0; i < vec_len (connections_this_batch); i++)
+    {
+      delete_session = 1;
+
+      sp = pool_elt_at_index (ecm->sessions, connections_this_batch[i]);
+
+      if (sp->bytes_to_send > 0)
+	{
+	  send_data_chunk (ecm, sp);
+	  delete_session = 0;
+	}
+      if (sp->bytes_to_receive > 0)
+	{
+	  delete_session = 0;
+	}
+      if (PREDICT_FALSE (delete_session == 1))
+	{
+	  session_t *s;
+
+	  clib_atomic_fetch_add (&ecm->tx_total, sp->bytes_sent);
+	  clib_atomic_fetch_add (&ecm->rx_total, sp->bytes_received);
+	  s = session_get_from_handle_if_valid (sp->vpp_session_handle);
+
+	  if (s)
+	    {
+	      vnet_disconnect_args_t _a, *a = &_a;
+	      a->handle = session_handle (s);
+	      a->app_index = ecm->app_index;
+	      vnet_disconnect_session (a);
+
+	      vec_delete (connections_this_batch, 1, i);
+	      i--;
+	      clib_atomic_fetch_add (&ecm->ready_connections, -1);
+	    }
+	  else
+	    {
+	      clib_warning ("session AWOL?");
+	      vec_delete (connections_this_batch, 1, i);
+	    }
+
+	  /* Kick the debug CLI process */
+	  if (ecm->ready_connections == 0)
+	    {
+	      signal_evt_to_cli (2);
+	    }
+	}
+    }
+
+  ecm->connection_index_by_thread[my_thread_index] = connection_indices;
+  ecm->connections_this_batch_by_thread[my_thread_index] =
+    connections_this_batch;
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (echo_clients_node) =
+{
+  .function = echo_client_node_fn,
+  .name = "echo-clients",
+  .type = VLIB_NODE_TYPE_INPUT,
+  .state = VLIB_NODE_STATE_DISABLED,
+};
+/* *INDENT-ON* */
+
+static int
+create_api_loopback (echo_client_main_t * ecm)
+{
+  api_main_t *am = &api_main;
+  vl_shmem_hdr_t *shmem_hdr;
+
+  shmem_hdr = am->shmem_hdr;
+  ecm->vl_input_queue = shmem_hdr->vl_input_queue;
+  ecm->my_client_index = vl_api_memclnt_create_internal ("echo_client",
+							 ecm->vl_input_queue);
+  return 0;
+}
+
+static int
+echo_clients_init (vlib_main_t * vm)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  vlib_thread_main_t *vtm = vlib_get_thread_main ();
+  u32 num_threads;
+  int i;
+
+  if (create_api_loopback (ecm))
+    return -1;
+
+  num_threads = 1 /* main thread */  + vtm->n_threads;
+
+  /* Init test data. Big buffer */
+  vec_validate (ecm->connect_test_data, 4 * 1024 * 1024 - 1);
+  for (i = 0; i < vec_len (ecm->connect_test_data); i++)
+    ecm->connect_test_data[i] = i & 0xff;
+
+  vec_validate (ecm->rx_buf, num_threads - 1);
+  for (i = 0; i < num_threads; i++)
+    vec_validate (ecm->rx_buf[i], vec_len (ecm->connect_test_data) - 1);
+
+  ecm->is_init = 1;
+
+  vec_validate (ecm->connection_index_by_thread, vtm->n_vlib_mains);
+  vec_validate (ecm->connections_this_batch_by_thread, vtm->n_vlib_mains);
+  vec_validate (ecm->quic_session_index_by_thread, vtm->n_vlib_mains);
+  vec_validate (ecm->vpp_event_queue, vtm->n_vlib_mains);
+
+  return 0;
+}
+
+static int
+quic_echo_clients_qsession_connected_callback (u32 app_index, u32 api_context,
+					       session_t * s, u8 is_fail)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  vnet_connect_args_t *a = 0;
+  int rv;
+  u8 thread_index = vlib_get_thread_index ();
+  session_endpoint_cfg_t sep = SESSION_ENDPOINT_CFG_NULL;
+  u32 stream_n;
+
+  DBG ("QUIC Connection handle %d", session_handle (s));
+
+  vec_validate (a, 1);
+  a->uri = (char *) ecm->connect_uri;
+  parse_uri (a->uri, &sep);
+  sep.transport_opts = session_handle (s);
+  sep.port = 0;			/* QUIC: create a stream flag */
+
+  for (stream_n = 0; stream_n < ecm->quic_streams; stream_n++)
+    {
+      clib_memset (a, 0, sizeof (*a));
+      a->app_index = ecm->app_index;
+      a->api_context = -1 - api_context;
+      clib_memcpy (&a->sep_ext, &sep, sizeof (sep));
+
+      DBG ("QUIC opening stream %d", stream_n);
+      if ((rv = vnet_connect (a)))
+	{
+	  clib_error ("Stream session %d opening failed: %d", stream_n, rv);
+	  return -1;
+	}
+      DBG ("QUIC stream %d connected", stream_n);
+    }
+  vec_add1 (ecm->quic_session_index_by_thread[thread_index],
+	    session_handle (s));
+  vec_free (a);
+  return 0;
+}
+
+static int
+quic_echo_clients_session_connected_callback (u32 app_index, u32 api_context,
+					      session_t * s, u8 is_fail)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  eclient_session_t *session;
+  u32 session_index;
+  u8 thread_index;
+
+  if (PREDICT_FALSE (ecm->run_test != ECHO_CLIENTS_STARTING))
+    return -1;
+
+  if (is_fail)
+    {
+      clib_warning ("connection %d failed!", api_context);
+      ecm->run_test = ECHO_CLIENTS_EXITING;
+      signal_evt_to_cli (-1);
+      return 0;
+    }
+
+  if (s->listener_handle == SESSION_INVALID_HANDLE)
+    return quic_echo_clients_qsession_connected_callback (app_index,
+							  api_context, s,
+							  is_fail);
+  DBG ("STREAM Connection callback %d", api_context);
+
+  thread_index = s->thread_index;
+  ASSERT (thread_index == vlib_get_thread_index ()
+	  || session_transport_service_type (s) == TRANSPORT_SERVICE_CL);
+
+  if (!ecm->vpp_event_queue[thread_index])
+    ecm->vpp_event_queue[thread_index] =
+      session_main_get_vpp_event_queue (thread_index);
+
+  /*
+   * Setup session
+   */
+  clib_spinlock_lock_if_init (&ecm->sessions_lock);
+  pool_get (ecm->sessions, session);
+  clib_spinlock_unlock_if_init (&ecm->sessions_lock);
+
+  clib_memset (session, 0, sizeof (*session));
+  session_index = session - ecm->sessions;
+  session->bytes_to_send = ecm->bytes_to_send;
+  session->bytes_to_receive = ecm->no_return ? 0ULL : ecm->bytes_to_send;
+  session->data.rx_fifo = s->rx_fifo;
+  session->data.rx_fifo->client_session_index = session_index;
+  session->data.tx_fifo = s->tx_fifo;
+  session->data.tx_fifo->client_session_index = session_index;
+  session->data.vpp_evt_q = ecm->vpp_event_queue[thread_index];
+  session->vpp_session_handle = session_handle (s);
+
+  if (ecm->is_dgram)
+    {
+      transport_connection_t *tc;
+      tc = session_get_transport (s);
+      clib_memcpy_fast (&session->data.transport, tc,
+			sizeof (session->data.transport));
+      session->data.is_dgram = 1;
+    }
+
+  vec_add1 (ecm->connection_index_by_thread[thread_index], session_index);
+  clib_atomic_fetch_add (&ecm->ready_connections, 1);
+  if (ecm->ready_connections == ecm->expected_connections)
+    {
+      ecm->run_test = ECHO_CLIENTS_RUNNING;
+      /* Signal the CLI process that the action is starting... */
+      signal_evt_to_cli (1);
+    }
+
+  return 0;
+}
+
+static int
+echo_clients_session_connected_callback (u32 app_index, u32 api_context,
+					 session_t * s, u8 is_fail)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  eclient_session_t *session;
+  u32 session_index;
+  u8 thread_index;
+
+  if (PREDICT_FALSE (ecm->run_test != ECHO_CLIENTS_STARTING))
+    return -1;
+
+  if (is_fail)
+    {
+      clib_warning ("connection %d failed!", api_context);
+      ecm->run_test = ECHO_CLIENTS_EXITING;
+      signal_evt_to_cli (-1);
+      return 0;
+    }
+
+  thread_index = s->thread_index;
+  ASSERT (thread_index == vlib_get_thread_index ()
+	  || session_transport_service_type (s) == TRANSPORT_SERVICE_CL);
+
+  if (!ecm->vpp_event_queue[thread_index])
+    ecm->vpp_event_queue[thread_index] =
+      session_main_get_vpp_event_queue (thread_index);
+
+  /*
+   * Setup session
+   */
+  clib_spinlock_lock_if_init (&ecm->sessions_lock);
+  pool_get (ecm->sessions, session);
+  clib_spinlock_unlock_if_init (&ecm->sessions_lock);
+
+  clib_memset (session, 0, sizeof (*session));
+  session_index = session - ecm->sessions;
+  session->bytes_to_send = ecm->bytes_to_send;
+  session->bytes_to_receive = ecm->no_return ? 0ULL : ecm->bytes_to_send;
+  session->data.rx_fifo = s->rx_fifo;
+  session->data.rx_fifo->client_session_index = session_index;
+  session->data.tx_fifo = s->tx_fifo;
+  session->data.tx_fifo->client_session_index = session_index;
+  session->data.vpp_evt_q = ecm->vpp_event_queue[thread_index];
+  session->vpp_session_handle = session_handle (s);
+
+  if (ecm->is_dgram)
+    {
+      transport_connection_t *tc;
+      tc = session_get_transport (s);
+      clib_memcpy_fast (&session->data.transport, tc,
+			sizeof (session->data.transport));
+      session->data.is_dgram = 1;
+    }
+
+  vec_add1 (ecm->connection_index_by_thread[thread_index], session_index);
+  clib_atomic_fetch_add (&ecm->ready_connections, 1);
+  if (ecm->ready_connections == ecm->expected_connections)
+    {
+      ecm->run_test = ECHO_CLIENTS_RUNNING;
+      /* Signal the CLI process that the action is starting... */
+      signal_evt_to_cli (1);
+    }
+
+  return 0;
+}
+
+static void
+echo_clients_session_reset_callback (session_t * s)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  vnet_disconnect_args_t _a = { 0 }, *a = &_a;
+
+  if (s->session_state == SESSION_STATE_READY)
+    clib_warning ("Reset active connection %U", format_session, s, 2);
+
+  a->handle = session_handle (s);
+  a->app_index = ecm->app_index;
+  vnet_disconnect_session (a);
+  return;
+}
+
+static int
+echo_clients_session_create_callback (session_t * s)
+{
+  return 0;
+}
+
+static void
+echo_clients_session_disconnect_callback (session_t * s)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  vnet_disconnect_args_t _a = { 0 }, *a = &_a;
+  a->handle = session_handle (s);
+  a->app_index = ecm->app_index;
+  vnet_disconnect_session (a);
+  return;
+}
+
+void
+echo_clients_session_disconnect (session_t * s)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  vnet_disconnect_args_t _a = { 0 }, *a = &_a;
+  a->handle = session_handle (s);
+  a->app_index = ecm->app_index;
+  vnet_disconnect_session (a);
+}
+
+static int
+echo_clients_rx_callback (session_t * s)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  eclient_session_t *sp;
+
+  if (PREDICT_FALSE (ecm->run_test != ECHO_CLIENTS_RUNNING))
+    {
+      echo_clients_session_disconnect (s);
+      return -1;
+    }
+
+  sp = pool_elt_at_index (ecm->sessions, s->rx_fifo->client_session_index);
+  receive_data_chunk (ecm, sp);
+
+  if (svm_fifo_max_dequeue_cons (s->rx_fifo))
+    {
+      if (svm_fifo_set_event (s->rx_fifo))
+	session_send_io_evt_to_thread (s->rx_fifo, SESSION_IO_EVT_BUILTIN_RX);
+    }
+  return 0;
+}
+
+int
+echo_client_add_segment_callback (u32 client_index, u64 segment_handle)
+{
+  /* New heaps may be added */
+  return 0;
+}
+
+/* *INDENT-OFF* */
+static session_cb_vft_t echo_clients = {
+  .session_reset_callback = echo_clients_session_reset_callback,
+  .session_connected_callback = echo_clients_session_connected_callback,
+  .session_accept_callback = echo_clients_session_create_callback,
+  .session_disconnect_callback = echo_clients_session_disconnect_callback,
+  .builtin_app_rx_callback = echo_clients_rx_callback,
+  .add_segment_callback = echo_client_add_segment_callback
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+echo_clients_attach (u8 * appns_id, u64 appns_flags, u64 appns_secret)
+{
+  u32 prealloc_fifos, segment_size = 256 << 20;
+  echo_client_main_t *ecm = &echo_client_main;
+  vnet_app_attach_args_t _a, *a = &_a;
+  u64 options[16];
+  int rv;
+
+  clib_memset (a, 0, sizeof (*a));
+  clib_memset (options, 0, sizeof (options));
+
+  a->api_client_index = ecm->my_client_index;
+  if (ecm->transport_proto == TRANSPORT_PROTO_QUIC)
+    echo_clients.session_connected_callback =
+      quic_echo_clients_session_connected_callback;
+  a->session_cb_vft = &echo_clients;
+
+  prealloc_fifos = ecm->prealloc_fifos ? ecm->expected_connections : 1;
+
+  if (ecm->private_segment_size)
+    segment_size = ecm->private_segment_size;
+
+  options[APP_OPTIONS_ACCEPT_COOKIE] = 0x12345678;
+  options[APP_OPTIONS_SEGMENT_SIZE] = segment_size;
+  options[APP_OPTIONS_ADD_SEGMENT_SIZE] = segment_size;
+  options[APP_OPTIONS_RX_FIFO_SIZE] = ecm->fifo_size;
+  options[APP_OPTIONS_TX_FIFO_SIZE] = ecm->fifo_size;
+  options[APP_OPTIONS_PRIVATE_SEGMENT_COUNT] = ecm->private_segment_count;
+  options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] = prealloc_fifos;
+  options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_IS_BUILTIN;
+  options[APP_OPTIONS_TLS_ENGINE] = ecm->tls_engine;
+  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 ((rv = vnet_application_attach (a)))
+    return clib_error_return (0, "attach returned %d", rv);
+
+  ecm->app_index = a->app_index;
+  return 0;
+}
+
+static int
+echo_clients_detach ()
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  vnet_app_detach_args_t _da, *da = &_da;
+  int rv;
+
+  da->app_index = ecm->app_index;
+  da->api_client_index = ~0;
+  rv = vnet_application_detach (da);
+  ecm->test_client_attached = 0;
+  ecm->app_index = ~0;
+  return rv;
+}
+
+static void *
+echo_client_thread_fn (void *arg)
+{
+  return 0;
+}
+
+/** Start a transmit thread */
+int
+echo_clients_start_tx_pthread (echo_client_main_t * ecm)
+{
+  if (ecm->client_thread_handle == 0)
+    {
+      int rv = pthread_create (&ecm->client_thread_handle,
+			       NULL /*attr */ ,
+			       echo_client_thread_fn, 0);
+      if (rv)
+	{
+	  ecm->client_thread_handle = 0;
+	  return -1;
+	}
+    }
+  return 0;
+}
+
+clib_error_t *
+echo_clients_connect (vlib_main_t * vm, u32 n_clients)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  vnet_connect_args_t _a, *a = &_a;
+  int i, rv;
+
+  clib_memset (a, 0, sizeof (*a));
+
+  for (i = 0; i < n_clients; i++)
+    {
+      a->uri = (char *) ecm->connect_uri;
+      a->api_context = i;
+      a->app_index = ecm->app_index;
+      if ((rv = vnet_connect_uri (a)))
+	return clib_error_return (0, "connect returned: %d", rv);
+
+      /* Crude pacing for call setups  */
+      if ((i % 16) == 0)
+	vlib_process_suspend (vm, 100e-6);
+      ASSERT (i + 1 >= ecm->ready_connections);
+      while (i + 1 - ecm->ready_connections > 128)
+	vlib_process_suspend (vm, 1e-3);
+    }
+  return 0;
+}
+
+#define ec_cli_output(_fmt, _args...) 			\
+  if (!ecm->no_output)  				\
+    vlib_cli_output(vm, _fmt, ##_args)
+
+static clib_error_t *
+echo_clients_command_fn (vlib_main_t * vm,
+			 unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  vlib_thread_main_t *thread_main = vlib_get_thread_main ();
+  u64 tmp, total_bytes, appns_flags = 0, appns_secret = 0;
+  f64 test_timeout = 20.0, syn_timeout = 20.0, delta;
+  char *default_uri = "tcp://6.0.1.1/1234";
+  uword *event_data = 0, event_type;
+  f64 time_before_connects;
+  u32 n_clients = 1;
+  int preallocate_sessions = 0;
+  char *transfer_type;
+  clib_error_t *error = 0;
+  u8 *appns_id = 0;
+  int i;
+  session_endpoint_cfg_t sep = SESSION_ENDPOINT_CFG_NULL;
+  int rv;
+
+  ecm->quic_streams = 1;
+  ecm->bytes_to_send = 8192;
+  ecm->no_return = 0;
+  ecm->fifo_size = 64 << 10;
+  ecm->connections_per_batch = 1000;
+  ecm->private_segment_count = 0;
+  ecm->private_segment_size = 0;
+  ecm->no_output = 0;
+  ecm->test_bytes = 0;
+  ecm->test_failed = 0;
+  ecm->vlib_main = vm;
+  ecm->tls_engine = TLS_ENGINE_OPENSSL;
+  ecm->no_copy = 0;
+  ecm->run_test = ECHO_CLIENTS_STARTING;
+
+  if (thread_main->n_vlib_mains > 1)
+    clib_spinlock_init (&ecm->sessions_lock);
+  vec_free (ecm->connect_uri);
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "uri %s", &ecm->connect_uri))
+	;
+      else if (unformat (input, "nclients %d", &n_clients))
+	;
+      else if (unformat (input, "quic-streams %d", &ecm->quic_streams))
+	;
+      else if (unformat (input, "mbytes %lld", &tmp))
+	ecm->bytes_to_send = tmp << 20;
+      else if (unformat (input, "gbytes %lld", &tmp))
+	ecm->bytes_to_send = tmp << 30;
+      else if (unformat (input, "bytes %lld", &ecm->bytes_to_send))
+	;
+      else if (unformat (input, "test-timeout %f", &test_timeout))
+	;
+      else if (unformat (input, "syn-timeout %f", &syn_timeout))
+	;
+      else if (unformat (input, "no-return"))
+	ecm->no_return = 1;
+      else if (unformat (input, "fifo-size %d", &ecm->fifo_size))
+	ecm->fifo_size <<= 10;
+      else if (unformat (input, "private-segment-count %d",
+			 &ecm->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);
+	  ecm->private_segment_size = tmp;
+	}
+      else if (unformat (input, "preallocate-fifos"))
+	ecm->prealloc_fifos = 1;
+      else if (unformat (input, "preallocate-sessions"))
+	preallocate_sessions = 1;
+      else
+	if (unformat (input, "client-batch %d", &ecm->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"))
+	ecm->no_output = 1;
+      else if (unformat (input, "test-bytes"))
+	ecm->test_bytes = 1;
+      else if (unformat (input, "tls-engine %d", &ecm->tls_engine))
+	;
+      else
+	return clib_error_return (0, "failed: unknown input `%U'",
+				  format_unformat_error, input);
+    }
+
+  /* Store cli process node index for signalling */
+  ecm->cli_node_index =
+    vlib_get_current_process (vm)->node_runtime.node_index;
+
+  if (ecm->is_init == 0)
+    {
+      if (echo_clients_init (vm))
+	return clib_error_return (0, "failed init");
+    }
+
+
+  ecm->ready_connections = 0;
+  ecm->expected_connections = n_clients * ecm->quic_streams;
+  ecm->rx_total = 0;
+  ecm->tx_total = 0;
+
+  if (!ecm->connect_uri)
+    {
+      clib_warning ("No uri provided. Using default: %s", default_uri);
+      ecm->connect_uri = format (0, "%s%c", default_uri, 0);
+    }
+
+  if ((rv = parse_uri ((char *) ecm->connect_uri, &sep)))
+    return clib_error_return (0, "Uri parse error: %d", rv);
+  ecm->transport_proto = sep.transport_proto;
+  ecm->is_dgram = (sep.transport_proto == TRANSPORT_PROTO_UDP);
+
+#if ECHO_CLIENT_PTHREAD
+  echo_clients_start_tx_pthread ();
+#endif
+
+  vlib_worker_thread_barrier_sync (vm);
+  vnet_session_enable_disable (vm, 1 /* turn on session and transports */ );
+  vlib_worker_thread_barrier_release (vm);
+
+  if (ecm->test_client_attached == 0)
+    {
+      if ((error = echo_clients_attach (appns_id, appns_flags, appns_secret)))
+	{
+	  vec_free (appns_id);
+	  clib_error_report (error);
+	  return error;
+	}
+      vec_free (appns_id);
+    }
+  ecm->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], echo_clients_node.index,
+			 VLIB_NODE_STATE_POLLING);
+
+  if (preallocate_sessions)
+    pool_init_fixed (ecm->sessions, 1.1 * n_clients);
+
+  /* Fire off connect requests */
+  time_before_connects = vlib_time_now (vm);
+  if ((error = echo_clients_connect (vm, n_clients)))
+    goto cleanup;
+
+  /* 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:
+      ec_cli_output ("Timeout with only %d sessions active...",
+		     ecm->ready_connections);
+      error = clib_error_return (0, "failed: syn timeout with %d sessions",
+				 ecm->ready_connections);
+      goto cleanup;
+
+    case 1:
+      delta = vlib_time_now (vm) - time_before_connects;
+      if (delta != 0.0)
+	ec_cli_output ("%d three-way handshakes in %.2f seconds %.2f/s",
+		       n_clients, delta, ((f64) n_clients) / delta);
+
+      ecm->test_start_time = vlib_time_now (ecm->vlib_main);
+      ec_cli_output ("Test started at %.6f", ecm->test_start_time);
+      break;
+
+    default:
+      ec_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:
+      ec_cli_output ("Timeout with %d sessions still active...",
+		     ecm->ready_connections);
+      error = clib_error_return (0, "failed: timeout with %d sessions",
+				 ecm->ready_connections);
+      goto cleanup;
+
+    case 2:
+      ecm->test_end_time = vlib_time_now (vm);
+      ec_cli_output ("Test finished at %.6f", ecm->test_end_time);
+      break;
+
+    default:
+      ec_cli_output ("unexpected event(2): %d", event_type);
+      error = clib_error_return (0, "failed: unexpected event(2): %d",
+				 event_type);
+      goto cleanup;
+    }
+
+  delta = ecm->test_end_time - ecm->test_start_time;
+  if (delta != 0.0)
+    {
+      total_bytes = (ecm->no_return ? ecm->tx_total : ecm->rx_total);
+      transfer_type = ecm->no_return ? "half-duplex" : "full-duplex";
+      ec_cli_output ("%lld bytes (%lld mbytes, %lld gbytes) in %.2f seconds",
+		     total_bytes, total_bytes / (1ULL << 20),
+		     total_bytes / (1ULL << 30), delta);
+      ec_cli_output ("%.2f bytes/second %s", ((f64) total_bytes) / (delta),
+		     transfer_type);
+      ec_cli_output ("%.4f gbit/second %s",
+		     (((f64) total_bytes * 8.0) / delta / 1e9),
+		     transfer_type);
+    }
+  else
+    {
+      ec_cli_output ("zero delta-t?");
+      error = clib_error_return (0, "failed: zero delta-t");
+      goto cleanup;
+    }
+
+  if (ecm->test_bytes && ecm->test_failed)
+    error = clib_error_return (0, "failed: test bytes");
+
+cleanup:
+  ecm->run_test = ECHO_CLIENTS_EXITING;
+  vlib_process_wait_for_event_or_clock (vm, 10e-3);
+  for (i = 0; i < vec_len (ecm->connection_index_by_thread); i++)
+    {
+      vec_reset_length (ecm->connection_index_by_thread[i]);
+      vec_reset_length (ecm->connections_this_batch_by_thread[i]);
+      vec_reset_length (ecm->quic_session_index_by_thread[i]);
+    }
+
+  pool_free (ecm->sessions);
+
+  /* Detach the application, so we can use different fifo sizes next time */
+  if (ecm->test_client_attached)
+    {
+      if (echo_clients_detach ())
+	{
+	  error = clib_error_return (0, "failed: app detach");
+	  ec_cli_output ("WARNING: app detach failed...");
+	}
+    }
+  if (error)
+    ec_cli_output ("test failed");
+  vec_free (ecm->connect_uri);
+  return error;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (echo_clients_command, static) =
+{
+  .path = "test echo clients",
+  .short_help = "test echo 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 <tcp://ip/port>][test-bytes][no-output]",
+  .function = echo_clients_command_fn,
+  .is_mp_safe = 1,
+};
+/* *INDENT-ON* */
+
+clib_error_t *
+echo_clients_main_init (vlib_main_t * vm)
+{
+  echo_client_main_t *ecm = &echo_client_main;
+  ecm->is_init = 0;
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (echo_clients_main_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */