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/*
* All very trivial - the simpler the better I say. We try and keep
* quqes of netbufs by squirreling a pointer away below the data area.
* This is done by the ppp_nb_alloc function. As long as everyone
* uses the ppp shrink and grow functions we should be o.k. This code
* has now been modified to keep the mark_t stuff nhere as well since
* we probably shafted that good and proper in the last version. oops !
* PCF
*/
#ifndef __NBQ_H__
#define __NBQ_H__
#define KERNEL 1
#include <sys/types.h>
#if !(NS_TARGET >= 40)
#include <kernserv/prototypes.h>
#endif /* NS_TARGET */
#include "netbuf.h"
typedef u_int mark_t;
#define NETBUF_T netbuf_t
#define NB_ALLOC ppp_nb_alloc
#define NB_FREE nb_free
#define NB_MAP nb_map
#define NB_SIZE nb_size
#define NB_SHRINK_TOP ppp_nb_shrink_top
#define NB_GROW_TOP ppp_nb_grow_top
#define NB_SHRINK_BOT nb_shrink_bot
#define NB_GROW_BOT nb_grow_bot
#define NB_READ nb_read
#define NB_WRITE nb_write
#define NB_GET_MARK nb_get_mark
#define NB_SET_MARK nb_set_mark
#define NB_GET_NEXT nb_get_next
#define NB_SET_NEXT nb_set_next
#define nb_TO_NB(nb) (nb)
#define NB_TO_nb(NB) (NB)
struct qparms {
u_char q_low, q_high, q_max;
char *q_name;
};
struct nb_queue {
char *name;
int low, high, max, len, dropped;
NETBUF_T head, tail;
};
#define NB_EXTRA (sizeof(mark_t)+sizeof(netbuf_t))
static inline void
nb_set_next(netbuf_t nb, netbuf_t ptr)
{
if(nb) bcopy(&ptr,NB_MAP(nb)-sizeof(netbuf_t),sizeof(netbuf_t));
}
static inline void
nb_get_next(netbuf_t nb, netbuf_t *ptr)
{
if(nb && ptr) bcopy(NB_MAP(nb)-sizeof(netbuf_t),ptr,sizeof(netbuf_t));
}
static inline void
nb_set_mark(netbuf_t nb, mark_t ptr)
{
if(nb) bcopy(&ptr,NB_MAP(nb)-NB_EXTRA,sizeof(mark_t));
}
static inline void
nb_get_mark(netbuf_t nb, mark_t *ptr)
{
if(nb && ptr) bcopy(NB_MAP(nb)-NB_EXTRA,ptr,sizeof(mark_t));
}
static inline void
ppp_nb_shrink_top(netbuf_t nb, unsigned int size)
{
netbuf_t ptr;
mark_t mark;
NB_GET_NEXT(nb,&ptr);
NB_GET_MARK(nb,&mark);
nb_shrink_top(nb,size);
NB_SET_MARK(nb,mark);
NB_SET_NEXT(nb,ptr);
}
static inline void
ppp_nb_grow_top(netbuf_t nb, unsigned int size)
{
netbuf_t ptr;
mark_t mark;
NB_GET_NEXT(nb,&ptr);
NB_GET_MARK(nb,&mark);
nb_grow_top(nb,size);
NB_SET_MARK(nb,mark);
NB_SET_NEXT(nb,ptr);
}
static inline netbuf_t
ppp_nb_alloc(unsigned int size)
{
netbuf_t nb;
size+=NB_EXTRA;
nb=nb_alloc(size);
if(nb) {
nb_shrink_top(nb,NB_EXTRA);
NB_SET_NEXT(nb,NULL);
NB_SET_MARK(nb,0);
}
return nb;
}
#endif /* __NBQ_H__ */
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