skbuff.c

这是基于TI公司的DSP TMS320DM642而开发的TCP/UDP协议

#include "skbuff.h"

extern PKTQ     FreeQueue;

int skb_init(struct sk_buff *skb,unsigned char *pBuf)
{
    skb->data = pBuf;
    skb->buf=pBuf ;
	skb->len = 0;
	skb->truesize = ETH_FRAME_LEN;
	return 0;
}

void skb_headerinit(struct sk_buff *skb)
{
	skb->data = skb->buf;
	skb->len = 0;
	skb->truesize = ETH_FRAME_LEN;
}

int alloc_skb(struct sk_buff *skb,unsigned int size)
{
	EMAC_Pkt *pPkt;
    pPkt = pqPop(&FreeQueue);
    if(pPkt==0)
    {
        return -1;
    }
    skb->buf=pPkt->pDataBuffer;
    skb->pPkt=pPkt; 
	skb_headerinit(skb);
}

void free_skb(struct sk_buff *skb)
{
    pqPush( &FreeQueue, skb->pPkt );
}

unsigned char *skb_put(struct sk_buff *skb, unsigned int len)
{
	skb->len += len;
	return skb->data;
}

unsigned char *skb_pull(struct sk_buff *skb, unsigned int len)
{
	skb->data += len;
	skb->len -= len;
	return skb->data;
}

unsigned char *skb_push(struct sk_buff *skb, unsigned int len)
{
	skb->data -= len;
	skb->len += len;
	return skb->data;
}

void skb_reserve(struct sk_buff *skb, unsigned int len)
{
	skb->data += len;
	
}