86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
/*
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* File: nbuf.h
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* Purpose: Definitions for network buffer management
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*
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* Notes: These routines implement a network buffer scheme
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*/
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#ifndef _NBUF_H_
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#define _NBUF_H_
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/********************************************************************/
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/*
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* Include the Queue structure definitions
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*/
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#include "queue.h"
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/*
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* Number of network buffers to use
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*/
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#define NBUF_MAX 30
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/*
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* Size of each buffer in bytes
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*/
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#ifndef NBUF_SZ
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#define NBUF_SZ 1520
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#endif
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/*
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* Defines to identify all the buffer queues
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* - FREE must always be defined as 0
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*/
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#define NBUF_FREE 0 /* available buffers */
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#define NBUF_TX_RING 1 /* buffers in the Tx BD ring */
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#define NBUF_RX_RING 2 /* buffers in the Rx BD ring */
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#define NBUF_SCRATCH 3 /* misc */
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#define NBUF_MAXQ 4 /* total number of queueus */
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/*
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* Buffer Descriptor Format
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*
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* Fields:
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* next Pointer to next node in the queue
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* data Pointer to the data buffer
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* offset Index into buffer
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* length Remaining bytes in buffer from (data + offset)
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*/
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typedef struct
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{
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QNODE node;
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uint8_t *data;
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uint16_t offset;
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uint16_t length;
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} NBUF;
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/*
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* Functions to manipulate the network buffers.
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*/
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int
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nbuf_init(void);
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void
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nbuf_flush(void);
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NBUF *
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nbuf_alloc (void);
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void
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nbuf_free(NBUF *);
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NBUF *
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nbuf_remove(int);
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void
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nbuf_add(int, NBUF *);
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void
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nbuf_reset(void);
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void
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nbuf_debug_dump(void);
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/********************************************************************/
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#endif /* _NBUF_H_ */
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