vpp-swan: Add plugin for vpp-swan

Added plugin vpp-swan is a plugin that helps offloading
Strongswan IPsec ESP process from Linux Kernel to VPP.

Type: feature
Signed-off-by: Gabriel Oginski <gabrielx.oginski@intel.com>
Change-Id: Iec77945892453fac1890d3c49d7d86fc6b09c893
(cherry picked from commit 4e88e041ad47bf422bbb2a0940f77aba11ea2178)

1 files changed, 85 insertions, 0 deletions

diff --git a/extras/strongswan/vpp_sswan/kernel_vpp_shared.h b/extras/strongswan/vpp_sswan/kernel_vpp_shared.h
new file mode 100644
index 00000000000..c699d4925f3
--- /dev/null
+++ b/extras/strongswan/vpp_sswan/kernel_vpp_shared.h
@@ -0,0 +1,85 @@
+#ifndef KERNEL_VPP_SHARED_H_
+#define KERNEL_VPP_SHARED_H_
+/*
+ * Copyright (c) 2022 Intel 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.
+ */
+
+typedef struct vac_t vac_t;
+
+/**
+ * Callback function invoked for received event messages.
+ *
+ * @param data     associated event message, destroyed by VPP API wrapper
+ * @param data_len length of the event message
+ * @param ctx      user data, as passed to register_event
+ */
+typedef void (*event_cb_t) (char *data, int data_len, void *ctx);
+
+/**
+ * Wrapper around VPP binary API client.
+ */
+struct vac_t
+{
+
+  /**
+   * Destroy the VPP API client.
+   */
+  void (*destroy) (vac_t *this);
+
+  /**
+   * Send VPP API message and wait for a reply
+   *
+   * @param in      VPP API message to send
+   * @param in_len  length of the message to send
+   * @param out     received VPP API message
+   * @param out_len length of the received message
+   */
+  status_t (*send) (vac_t *this, char *in, int in_len, char **out,
+		    int *out_len);
+
+  /**
+   * Send VPP API dump message and wait for a reply.
+   *
+   * @param in      VPP API message to send
+   * @param in_len  length of the message to send
+   * @param out     received VPP API message
+   * @param out_len length of the received message
+   */
+  status_t (*send_dump) (vac_t *this, char *in, int in_len, char **out,
+			 int *out_len);
+
+  /**
+   * Register for VPP API event of a given kind.
+   *
+   * @param in       VPP API event message to register
+   * @param in_len   length of the event message to register
+   * @param cb       callback function to register
+   * @param event_id event ID
+   * @param ctx      user data passed to callback invocations
+   */
+  status_t (*register_event) (vac_t *this, char *in, int in_len, event_cb_t cb,
+			      uint16_t event_id, void *ctx);
+};
+
+extern vac_t *vac;
+
+/**
+ * Establishing a binary API connection to VPP.
+ *
+ * @param name client name
+ * @return     vac_t instance
+ */
+vac_t *vac_create (char *name);
+
+#endif /* KERNEL_VPP_SHARED_H_ */