Pipes

A pipe resembles a unix pipe. Each end of the pipe is a full
VPP interface.
pipes can be used for e.g. packet recirculation, inter-BD, etc.

Change-Id: I185bb9fb43dd233ff45da63ac1b85ae2e1ceca16
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

1 files changed, 177 insertions, 0 deletions

diff --git a/src/vnet/devices/pipe/pipe_api.c b/src/vnet/devices/pipe/pipe_api.c
new file mode 100644
index 00000000000..46bbea5f275
--- /dev/null
+++ b/src/vnet/devices/pipe/pipe_api.c
@@ -0,0 +1,177 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2018 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 <vlibmemory/api.h>
+
+#include <vnet/devices/pipe/pipe.h>
+#include <vnet/vnet_msg_enum.h>
+
+#define vl_typedefs		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vnet/vnet_all_api_h.h>
+#undef vl_printfun
+
+#include <vlibapi/api_helper_macros.h>
+vpe_api_main_t vpe_api_main;
+
+#define foreach_vpe_api_msg                                     \
+  _(PIPE_CREATE, pipe_create)                                   \
+  _(PIPE_DELETE, pipe_delete)                                   \
+  _(PIPE_DUMP,   pipe_dump)
+
+static void
+vl_api_pipe_create_t_handler (vl_api_pipe_create_t * mp)
+{
+  vl_api_pipe_create_reply_t *rmp;
+  u32 parent_sw_if_index;
+  u32 pipe_sw_if_index[2];
+  int rv;
+  u8 is_specified = mp->is_specified;
+  u32 user_instance = ntohl (mp->user_instance);
+
+  rv = vnet_create_pipe_interface (is_specified, user_instance,
+				   &parent_sw_if_index, pipe_sw_if_index);
+
+  /* *INDENT-OFF* */
+  REPLY_MACRO2(VL_API_PIPE_CREATE_REPLY,
+  ({
+    rmp->parent_sw_if_index = ntohl (parent_sw_if_index);
+    rmp->pipe_sw_if_index[0] = ntohl (pipe_sw_if_index[0]);
+    rmp->pipe_sw_if_index[1] = ntohl (pipe_sw_if_index[1]);
+  }));
+  /* *INDENT-ON* */
+}
+
+static void
+vl_api_pipe_delete_t_handler (vl_api_pipe_delete_t * mp)
+{
+  vl_api_pipe_delete_reply_t *rmp;
+  int rv;
+
+  rv = vnet_delete_pipe_interface (ntohl (mp->parent_sw_if_index));
+
+  REPLY_MACRO (VL_API_PIPE_DELETE_REPLY);
+}
+
+typedef struct pipe_dump_walk_t_
+{
+  vl_api_registration_t *reg;
+  u32 context;
+} pipe_dump_walk_t;
+
+static walk_rc_t
+pipe_send_details (u32 parent_sw_if_index,
+		   u32 pipe_sw_if_index[2], u32 instance, void *args)
+{
+  pipe_dump_walk_t *ctx = args;
+  vl_api_pipe_details_t *mp;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  if (!mp)
+    return (WALK_STOP);
+
+  mp->_vl_msg_id = ntohs (VL_API_PIPE_DETAILS);
+  mp->context = ctx->context;
+
+  mp->instance = ntohl (instance);
+  mp->parent_sw_if_index = ntohl (parent_sw_if_index);
+  mp->pipe_sw_if_index[0] = ntohl (pipe_sw_if_index[0]);
+  mp->pipe_sw_if_index[1] = ntohl (pipe_sw_if_index[1]);
+
+  vl_api_send_msg (ctx->reg, (u8 *) mp);
+
+  return (WALK_CONTINUE);
+}
+
+static void
+vl_api_pipe_dump_t_handler (vl_api_pipe_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  pipe_dump_walk_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  pipe_walk (pipe_send_details, &ctx);
+}
+
+/*
+ * vpe_api_hookup
+ * Add vpe's API message handlers to the table.
+ * vlib has alread mapped shared memory and
+ * added the client registration handlers.
+ * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process()
+ */
+#define vl_msg_name_crc_list
+#include <vnet/devices/pipe/pipe.api.h>
+#undef vl_msg_name_crc_list
+
+static void
+setup_message_id_table (api_main_t * am)
+{
+#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id);
+  foreach_vl_msg_name_crc_pipe;
+#undef _
+}
+
+static clib_error_t *
+pipe_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_api_##n##_t_endian,               \
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_vpe_api_msg;
+#undef _
+
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  setup_message_id_table (am);
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (pipe_api_hookup);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */