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include/nbuf.h

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+/*
+ * File:        nbuf.h
+ * Purpose:     Definitions for network buffer management
+ *
+ * Notes:       These routines implement a network buffer scheme
+ */
+
+#ifndef _NBUF_H_
+#define _NBUF_H_
+
+#include "bas_types.h"
+
+/*
+ * Include the Queue structure definitions
+ */
+#include "queue.h"
+
+/*
+ * Number of network buffers to use
+ */
+#define NBUF_MAX    30
+
+/*
+ * Size of each buffer in bytes
+ */
+#ifndef NBUF_SZ
+#define NBUF_SZ     2048
+#endif 
+
+/*
+ * Defines to identify all the buffer queues
+ *  - FREE must always be defined as 0
+ */
+#define NBUF_FREE       0   /* available buffers */
+#define NBUF_TX_RING    1   /* buffers in the Tx BD ring */
+#define NBUF_RX_RING    2   /* buffers in the Rx BD ring */
+#define NBUF_SCRATCH    3   /* misc */
+#define NBUF_MAXQ       4   /* total number of queueus */
+
+/* 
+ * Buffer Descriptor Format 
+ * 
+ * Fields:
+ * next     Pointer to next node in the queue
+ * data     Pointer to the data buffer
+ * offset   Index into buffer
+ * length   Remaining bytes in buffer from (data + offset)
+ */
+typedef struct
+{
+	QNODE node;
+	uint8_t *data;   
+	uint16_t offset;
+	uint16_t length;
+} NBUF;
+
+/*
+ * Functions to manipulate the network buffers.
+ */
+extern int nbuf_init(void);
+extern void nbuf_flush(void);
+extern NBUF *nbuf_alloc (void);
+extern void nbuf_free(NBUF *);
+extern NBUF *nbuf_remove(int);
+extern void nbuf_add(int, NBUF *);
+extern void nbuf_reset(void);
+extern void nbuf_debug_dump(void);
+
+
+#endif  /* _NBUF_H_ */