netbuf_t
pppgetbuf(netif_t ifp)
{
NETBUF_T nb;
int len = MAX(if_mtu(ifp), PPP_MTU) + PPP_HDRLEN + PPP_FCSLEN;
nb = NB_ALLOC(len);
if (nb != NULL)
{
NB_SHRINK_TOP(nb, PPP_HDRLEN);
NB_SHRINK_BOT(nb, PPP_FCSLEN); /* grown by pppstart() */
}
return NB_TO_nb(nb);
}
int pk_init (void)
{
PACKET packet;
unsigned i;
unsigned numpkts = bigbufs + lilbufs;
u_char align_req;
#ifdef ALIGN_BUFS
align_req = ALIGN_BUFS;
#else
align_req = 0;
#endif
for (i = 0; i < numpkts; i++)
{
packet = (PACKET)NB_ALLOC(sizeof(struct netbuf));
if (packet == NULL)
goto no_pkt_buf;
#ifdef NPDEBUG
if (i >= MAXPACKETS)
{
dprintf("pk_init: bad define\n");
return -1;
}
pktlog[i] = packet; /* save for debugging */
#endif
packet->nb_tstamp = 0L;
if (i < bigbufs)
{
#ifdef NPDEBUG
{
int j;
/* for DEBUG compiles, bracket the data area with special chars */
packet->nb_buff = (char *)BB_ALLOC(bigbufsiz+ALIGN_TYPE+1);
if (!(packet->nb_buff))
goto no_pkt_buf;
/* Add memory markers for sanity check */
for(j = 0; j < ALIGN_TYPE; j++)
*(packet->nb_buff + j) = 'M'; /* MMs at start of buf */
*(packet->nb_buff + bigbufsiz + ALIGN_TYPE) = 'M';
packet->nb_buff += ALIGN_TYPE; /* bump buf past MMs */
}
#else
packet->nb_buff = (char *)BB_ALLOC(bigbufsiz + align_req);
#ifdef ALIGN_BUFS
/* align start of buffer pointer to desired offset */
packet->nb_buff += (ALIGN_BUFS - (((u_long) packet->nb_buff) & (ALIGN_BUFS - 1)));
#endif
#endif
if (!(packet->nb_buff))
goto no_pkt_buf;
packet->nb_blen = bigbufsiz;
q_add(&bigfreeq, packet); /* save it in big pkt free queue */
}
else /* get a small buffer */
{
#ifdef NPDEBUG
{
int j;
/* for DEBUG compiles, bracket the data area with special chars */
packet->nb_buff = (char *)LB_ALLOC(lilbufsiz+ALIGN_TYPE+1);
if (!(packet->nb_buff))
goto no_pkt_buf;
/* Add memory markers for sanity check */
for(j = 0; j < ALIGN_TYPE; j++)
*(packet->nb_buff + j) = 'M'; /* MMs at start of buf */
*(packet->nb_buff + lilbufsiz + ALIGN_TYPE) = 'M';
packet->nb_buff += ALIGN_TYPE;
}
#else
packet->nb_buff = (char *)LB_ALLOC(lilbufsiz + align_req);
#ifdef ALIGN_BUFS
/* align start of buffer pointer to desired offset */
packet->nb_buff += (ALIGN_BUFS - (((u_long) packet->nb_buff) & (ALIGN_BUFS - 1)));
#endif
#endif
if (!(packet->nb_buff))
goto no_pkt_buf;
packet->nb_blen = lilbufsiz;
q_add(&lilfreeq, packet); /* save it in little free queue */
}
}
bigfreeq.q_min = bigbufs;
lilfreeq.q_min = lilbufs;
#ifdef HEAPBUFS
/* initialize the counters that keep track of the total amount of memory
* allocated from the heap and the corresponding high watermark */
heap_curr_mem = 0;
heap_curr_mem_hi_watermark = 0;
/* set the heap's access type to blocking */
heap_type = HEAP_ACCESS_BLOCKING;
#endif
return 0;
no_pkt_buf:
#ifdef NPDEBUG
dprintf("Netinit: calloc failed getting buffer %d\n", i);
#endif
return(-1);
}
