Diff: features/netsocket/emac_stack_mem.h

Revision:

0:f269e3021894

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/features/netsocket/emac_stack_mem.h	Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,107 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016 ARM Limited
+ *
+ * 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 MBED_EMAC_STACK_MEM_H
+#define MBED_EMAC_STACK_MEM_H
+
+#if DEVICE_EMAC
+
+#include <stdint.h>
+
+/**
+ * Stack memory module
+ *
+ * This interface provides abstraction for memory modules used in different IP stacks (often to accommodate zero copy).
+ * Emac interface may be required to accept output packets and provide received data using this stack specific API.
+ * This header should be implemented for each IP stack, so that we keep emacs module independent.
+ */
+typedef void emac_stack_mem_t;
+typedef void emac_stack_mem_chain_t;
+typedef void emac_stack_t;
+
+/**
+ * Allocates stack memory
+ *
+ * @param  stack Emac stack context
+ * @param  size  Size of memory to allocate
+ * @param  align Memory alignment requirements
+ * @return       Allocated memory struct, or NULL in case of error
+ */
+emac_stack_mem_t *emac_stack_mem_alloc(emac_stack_t* stack, uint32_t size, uint32_t align);
+
+/**
+ * Free memory allocated using @a stack_mem_alloc
+ *
+ * @param  stack Emac stack context
+ * @param mem Memory to be freed
+ */
+void emac_stack_mem_free(emac_stack_t* stack, emac_stack_mem_t *mem);
+
+/**
+ * Return pointer to the payload
+ *
+ * @param  stack Emac stack context
+ * @param  mem Memory structure
+ * @return     Pointer to the payload
+ */
+void *emac_stack_mem_ptr(emac_stack_t* stack, emac_stack_mem_t *mem);
+
+/**
+ * Return actual payload size
+ *
+ * @param  stack Emac stack context
+ * @param  mem Memory structure
+ * @return     Size in bytes
+ */
+uint32_t emac_stack_mem_len(emac_stack_t* stack, emac_stack_mem_t *mem);
+
+/**
+ * Sets the actual payload size (the allocated payload size will not change)
+ *
+ * @param stack Emac stack context
+ * @param mem Memory structure
+ * @param len Actual payload size
+ */
+void emac_stack_mem_set_len(emac_stack_t* stack, emac_stack_mem_t *mem, uint32_t len);
+
+/**
+ * Returns first memory structure from the list and move the head to point to the next node
+ *
+ * @param  stack Emac stack context
+ * @param  list Pointer to the list
+ * @return      First memory structure from the list
+ */
+emac_stack_mem_t *emac_stack_mem_chain_dequeue(emac_stack_t* stack, emac_stack_mem_chain_t **chain);
+
+/**
+ * Return total length of the memory chain
+ *
+ * @param  stack Emac stack context
+ * @param  chain Memory chain
+ * @return       Chain length
+ */
+uint32_t emac_stack_mem_chain_len(emac_stack_t* stack, emac_stack_mem_chain_t *chain);
+
+/**
+ * Increases the reference counter for the memory
+ *
+ * @param  stack Emac stack context
+ * @param  mem   Memory structure
+ */
+void emac_stack_mem_ref(emac_stack_t* stack, emac_stack_mem_t *mem);
+
+#endif /* DEVICE_EMAC */
+
+#endif /* EMAC_MBED_STACK_MEM_h */