1 files changed, 61 insertions, 0 deletions
diff --git a/stacks/lwip_stack/src/sbr/sbr_index_ring.h b/stacks/lwip_stack/src/sbr/sbr_index_ring.h
new file mode 100644
index 0000000..7a1e396
--- /dev/null
+++ b/stacks/lwip_stack/src/sbr/sbr_index_ring.h
@@ -0,0 +1,61 @@
+/*
+*
+* Copyright (c) 2018 Huawei Technologies Co.,Ltd.
+* 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 _SBR_INDEX_RING_H_
+#define _SBR_INDEX_RING_H_
+
+#include "types.h"
+
+#ifdef __cplusplus
+/* *INDENT-OFF* */
+extern "C" {
+/* *INDENT-ON* */
+#endif
+
+typedef struct
+{
+    union
+    {
+        struct
+        {
+            volatile u32 ver;
+            volatile u32 val;
+        };
+        u64 data;
+    };
+} sbr_index_node;
+
+typedef struct
+{
+    volatile u32 head;
+    i8 cache_space[124];
+    volatile u32 tail;
+    u32 num;
+    u32 mask;
+    sbr_index_node nodes[0];
+} sbr_index_ring;
+
+sbr_index_ring *sbr_create_index_ring(u32 num);
+int sbr_index_ring_enqueue(sbr_index_ring * ring, i32 val);
+int sbr_index_ring_dequeue(sbr_index_ring * ring, i32 * val);
+
+#ifdef __cplusplus
+/* *INDENT-OFF* */
+}
+/* *INDENT-ON* */
+#endif
+
+#endif