VPP-598: tcp stack initial commit

Change-Id: I49e5ce0aae6e4ff634024387ceaf7dbc432a0351
Signed-off-by: Dave Barach <dave@barachs.net>
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 239 insertions, 0 deletions

diff --git a/src/vnet/udp/builtin_server.c b/src/vnet/udp/builtin_server.c
new file mode 100644
index 00000000..afa66ba4
--- /dev/null
+++ b/src/vnet/udp/builtin_server.c
@@ -0,0 +1,239 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/** @file
+    udp builtin server
+*/
+
+#include <vnet/udp/udp.h>
+#include <vnet/session/session.h>
+#include <vnet/session/application_interface.h>
+
+/** per-worker built-in server copy buffers */
+u8 **copy_buffers;
+
+static int
+builtin_session_create_callback (stream_session_t * s)
+{
+  /* Simple version: declare session ready-to-go... */
+  s->session_state = SESSION_STATE_READY;
+  return 0;
+}
+
+static void
+builtin_session_disconnect_callback (stream_session_t * s)
+{
+  stream_session_disconnect (s);
+}
+
+static int
+builtin_server_rx_callback (stream_session_t * s)
+{
+  svm_fifo_t *rx_fifo, *tx_fifo;
+  u32 this_transfer;
+  int actual_transfer;
+  u8 *my_copy_buffer;
+  session_fifo_event_t evt;
+  unix_shared_memory_queue_t *q;
+
+  my_copy_buffer = copy_buffers[s->thread_index];
+  rx_fifo = s->server_rx_fifo;
+  tx_fifo = s->server_tx_fifo;
+
+  this_transfer = svm_fifo_max_enqueue (tx_fifo)
+    < svm_fifo_max_dequeue (rx_fifo) ?
+    svm_fifo_max_enqueue (tx_fifo) : svm_fifo_max_dequeue (rx_fifo);
+
+  vec_validate (my_copy_buffer, this_transfer - 1);
+  _vec_len (my_copy_buffer) = this_transfer;
+
+  actual_transfer = svm_fifo_dequeue_nowait (rx_fifo, 0, this_transfer,
+					     my_copy_buffer);
+  ASSERT (actual_transfer == this_transfer);
+  actual_transfer = svm_fifo_enqueue_nowait (tx_fifo, 0, this_transfer,
+					     my_copy_buffer);
+
+  copy_buffers[s->thread_index] = my_copy_buffer;
+
+  /* Fabricate TX event, send to ourselves */
+  evt.fifo = tx_fifo;
+  evt.event_type = FIFO_EVENT_SERVER_TX;
+  /* $$$$ for event logging */
+  evt.enqueue_length = actual_transfer;
+  evt.event_id = 0;
+  q = session_manager_get_vpp_event_queue (s->thread_index);
+  unix_shared_memory_queue_add (q, (u8 *) & evt, 0 /* do wait for mutex */ );
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+static session_cb_vft_t builtin_server = {
+    .session_accept_callback = builtin_session_create_callback,
+    .session_disconnect_callback = builtin_session_disconnect_callback,
+    .builtin_server_rx_callback = builtin_server_rx_callback
+};
+/* *INDENT-ON* */
+
+static int
+bind_builtin_uri_server (u8 * uri)
+{
+  vnet_bind_args_t _a, *a = &_a;
+  char segment_name[128];
+  u32 segment_name_length;
+  int rv;
+  u64 options[16];
+
+  segment_name_length = ARRAY_LEN (segment_name);
+
+  memset (a, 0, sizeof (*a));
+  memset (options, 0, sizeof (options));
+
+  a->uri = (char *) uri;
+  a->api_client_index = ~0;	/* built-in server */
+  a->segment_name = segment_name;
+  a->segment_name_length = segment_name_length;
+  a->session_cb_vft = &builtin_server;
+
+  options[SESSION_OPTIONS_ACCEPT_COOKIE] = 0x12345678;
+  options[SESSION_OPTIONS_SEGMENT_SIZE] = (2 << 30);	/*$$$$ config / arg */
+  a->options = options;
+
+  rv = vnet_bind_uri (a);
+
+  return rv;
+}
+
+static int
+unbind_builtin_uri_server (u8 * uri)
+{
+  int rv;
+
+  rv = vnet_unbind_uri ((char *) uri, ~0 /* client_index */ );
+
+  return rv;
+}
+
+static clib_error_t *
+builtin_server_init (vlib_main_t * vm)
+{
+  vlib_thread_main_t *vtm = vlib_get_thread_main ();
+  u32 num_threads;
+
+  num_threads = 1 /* main thread */  + vtm->n_threads;
+
+  vec_validate (copy_buffers, num_threads - 1);
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (builtin_server_init);
+
+static clib_error_t *
+builtin_uri_bind_command_fn (vlib_main_t * vm,
+			     unformat_input_t * input,
+			     vlib_cli_command_t * cmd)
+{
+  u8 *uri = 0;
+  int rv;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "uri %s", &uri))
+	;
+      else
+	break;
+    }
+
+  if (uri == 0)
+    return clib_error_return (0, "uri to bind not specified...");
+
+  rv = bind_builtin_uri_server (uri);
+
+  vec_free (uri);
+
+  switch (rv)
+    {
+    case 0:
+      break;
+
+    default:
+      return clib_error_return (0, "bind_uri_server returned %d", rv);
+      break;
+    }
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (builtin_uri_bind_command, static) =
+{
+  .path = "builtin uri bind",
+  .short_help = "builtin uri bind",
+  .function = builtin_uri_bind_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+builtin_uri_unbind_command_fn (vlib_main_t * vm,
+			       unformat_input_t * input,
+			       vlib_cli_command_t * cmd)
+{
+  u8 *uri = 0;
+  int rv;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "uri %s", &uri))
+	;
+      else
+	break;
+    }
+
+  if (uri == 0)
+    return clib_error_return (0, "uri to unbind not specified...");
+
+  rv = unbind_builtin_uri_server (uri);
+
+  vec_free (uri);
+
+  switch (rv)
+    {
+    case 0:
+      break;
+
+    default:
+      return clib_error_return (0, "unbind_uri_server returned %d", rv);
+      break;
+    }
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (builtin_uri_unbind_command, static) =
+{
+  .path = "builtin uri unbind",
+  .short_help = "builtin uri unbind",
+  .function = builtin_uri_unbind_command_fn,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */