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, 72 insertions, 0 deletions

diff --git a/src/vnet/devices/pipe/pipe.h b/src/vnet/devices/pipe/pipe.h
new file mode 100644
index 00000000000..ef72934c3ba
--- /dev/null
+++ b/src/vnet/devices/pipe/pipe.h
@@ -0,0 +1,72 @@
+/*
+ * 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.
+ */
+
+#ifndef __PIPE_H__
+#define __PIPE_H__
+
+#include <vnet/ethernet/ethernet.h>
+
+/**
+ * represenation of a pipe interface
+ */
+typedef struct pipe_t_
+{
+  /** the SW if_index of the other end of the pipe */
+  u32 sw_if_index;
+
+  /** Sub-interface config */
+  subint_config_t subint;
+} pipe_t;
+
+/**
+ * Create a new pipe interface
+ *
+ * @param is_specified Has the user speficied a desired instance number
+ * @param user_instance The user's desired instnace
+ * @param parent_sw_index OUT the created parent interface
+ * @param pipe_sw_if_index OUT the ends of the pipe
+ */
+extern int vnet_create_pipe_interface (u8 is_specified,
+				       u32 user_instance,
+				       u32 * parent_sw_if_index,
+				       u32 pipe_sw_if_index[2]);
+extern int vnet_delete_pipe_interface (u32 parent_sw_if_index);
+
+/**
+ * Get the pipe instnace based on one end
+ */
+extern pipe_t *pipe_get (u32 sw_if_index);
+
+/**
+ * Call back function when walking all the pipes
+ */
+typedef walk_rc_t (*pipe_cb_fn_t) (u32 parent_sw_if_index,
+				   u32 pipe_sw_if_index[2],
+				   u32 instance, void *ctx);
+
+/**
+ * Walk all the of pipe interfaces
+ */
+extern void pipe_walk (pipe_cb_fn_t fn, void *ctx);
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */