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isdn_net.h

/* $Id: isdn_net.h,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
 *
 * header for Linux ISDN subsystem, network related functions (linklevel).
 *
 * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
 * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
 * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

                        /* Definitions for hupflags:                */
#define ISDN_WAITCHARGE  1      /* did not get a charge info yet            */
#define ISDN_HAVECHARGE  2      /* We know a charge info                    */
#define ISDN_CHARGEHUP   4      /* We want to use the charge mechanism      */
#define ISDN_INHUP       8      /* Even if incoming, close after huptimeout */
#define ISDN_MANCHARGE  16      /* Charge Interval manually set             */

/*
 * Definitions for Cisco-HDLC header.
 */

#define CISCO_ADDR_UNICAST    0x0f
#define CISCO_ADDR_BROADCAST  0x8f
#define CISCO_CTRL            0x00
#define CISCO_TYPE_CDP        0x2000
#define CISCO_TYPE_SLARP      0x8035
#define CISCO_SLARP_REQUEST   0
#define CISCO_SLARP_REPLY     1
#define CISCO_SLARP_KEEPALIVE 2

extern char *isdn_net_new(char *, struct net_device *);
extern char *isdn_net_newslave(char *);
extern int isdn_net_rm(char *);
extern int isdn_net_rmall(void);
extern int isdn_net_stat_callback(int, isdn_ctrl *);
extern int isdn_net_setcfg(isdn_net_ioctl_cfg *);
extern int isdn_net_getcfg(isdn_net_ioctl_cfg *);
extern int isdn_net_addphone(isdn_net_ioctl_phone *);
extern int isdn_net_getphones(isdn_net_ioctl_phone *, char __user *);
extern int isdn_net_getpeer(isdn_net_ioctl_phone *, isdn_net_ioctl_phone __user *);
extern int isdn_net_delphone(isdn_net_ioctl_phone *);
extern int isdn_net_find_icall(int, int, int, setup_parm *);
extern void isdn_net_hangup(struct net_device *);
extern void isdn_net_dial(void);
extern void isdn_net_autohup(void);
extern int isdn_net_force_hangup(char *);
extern int isdn_net_force_dial(char *);
extern isdn_net_dev *isdn_net_findif(char *);
extern int isdn_net_rcv_skb(int, struct sk_buff *);
extern int isdn_net_dial_req(isdn_net_local *);
extern void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb);
extern void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb);

#define ISDN_NET_MAX_QUEUE_LENGTH 2

/*
 * is this particular channel busy?
 */
static __inline__ int isdn_net_lp_busy(isdn_net_local *lp)
{
      if (atomic_read(&lp->frame_cnt) < ISDN_NET_MAX_QUEUE_LENGTH)
            return 0;
      else 
            return 1;
}

/*
 * For the given net device, this will get a non-busy channel out of the
 * corresponding bundle. The returned channel is locked.
 */
static __inline__ isdn_net_local * isdn_net_get_locked_lp(isdn_net_dev *nd)
{
      unsigned long flags;
      isdn_net_local *lp;

      spin_lock_irqsave(&nd->queue_lock, flags);
      lp = nd->queue;         /* get lp on top of queue */
      spin_lock(&nd->queue->xmit_lock);
      while (isdn_net_lp_busy(nd->queue)) {
            spin_unlock(&nd->queue->xmit_lock);
            nd->queue = nd->queue->next;
            if (nd->queue == lp) { /* not found -- should never happen */
                  lp = NULL;
                  goto errout;
            }
            spin_lock(&nd->queue->xmit_lock);
      }
      lp = nd->queue;
      nd->queue = nd->queue->next;
      local_bh_disable();
errout:
      spin_unlock_irqrestore(&nd->queue_lock, flags);
      return lp;
}

/*
 * add a channel to a bundle
 */
static __inline__ void isdn_net_add_to_bundle(isdn_net_dev *nd, isdn_net_local *nlp)
{
      isdn_net_local *lp;
      unsigned long flags;

      spin_lock_irqsave(&nd->queue_lock, flags);

      lp = nd->queue;
//    printk(KERN_DEBUG "%s: lp:%s(%p) nlp:%s(%p) last(%p)\n",
//          __FUNCTION__, lp->name, lp, nlp->name, nlp, lp->last);
      nlp->last = lp->last;
      lp->last->next = nlp;
      lp->last = nlp;
      nlp->next = lp;
      nd->queue = nlp;

      spin_unlock_irqrestore(&nd->queue_lock, flags);
}
/*
 * remove a channel from the bundle it belongs to
 */
static __inline__ void isdn_net_rm_from_bundle(isdn_net_local *lp)
{
      isdn_net_local *master_lp = lp;
      unsigned long flags;

      if (lp->master)
            master_lp = (isdn_net_local *) lp->master->priv;

//    printk(KERN_DEBUG "%s: lp:%s(%p) mlp:%s(%p) last(%p) next(%p) mndq(%p)\n",
//          __FUNCTION__, lp->name, lp, master_lp->name, master_lp, lp->last, lp->next, master_lp->netdev->queue);
      spin_lock_irqsave(&master_lp->netdev->queue_lock, flags);
      lp->last->next = lp->next;
      lp->next->last = lp->last;
      if (master_lp->netdev->queue == lp) {
            master_lp->netdev->queue = lp->next;
            if (lp->next == lp) { /* last in queue */
                  master_lp->netdev->queue = master_lp->netdev->local;
            }
      }
      lp->next = lp->last = lp;     /* (re)set own pointers */
//    printk(KERN_DEBUG "%s: mndq(%p)\n",
//          __FUNCTION__, master_lp->netdev->queue);
      spin_unlock_irqrestore(&master_lp->netdev->queue_lock, flags);
}

static inline int
put_u8(unsigned char *p, u8 x)
{
      *p = x;
      return 1;
}

static inline int
put_u16(unsigned char *p, u16 x)
{
      *((u16 *)p) = htons(x);
      return 2;
}

static inline int
put_u32(unsigned char *p, u32 x)
{
      *((u32 *)p) = htonl(x);
      return 4;
}

static inline int
get_u8(unsigned char *p, u8 *x)
{
      *x = *p;
      return 1;
}

static inline int
get_u16(unsigned char *p, u16 *x)
{
      *x = ntohs(*((u16 *)p));
      return 2;
}

static inline int
get_u32(unsigned char *p, u32 *x)
{
      *x = ntohl(*((u32 *)p));
      return 4;
}



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