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/* $Id: isdn_net.h,v 1.1.1.1 2004-04-15 02:03:36 phoenix 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 *);

extern int isdn_net_getpeer(isdn_net_ioctl_phone *, isdn_net_ioctl_phone *);

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_bh(&nd->queue->xmit_lock);

        while (isdn_net_lp_busy(nd->queue)) {

                spin_unlock_bh(&nd->queue->xmit_lock);

                nd->queue = nd->queue->next;

                if (nd->queue == lp) { /* not found -- should never happen */

                        lp = NULL;

                        goto errout;

                }

                spin_lock_bh(&nd->queue->xmit_lock);

        }

        lp = nd->queue;

        nd->queue = nd->queue->next;

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 __FUNCTION__": lp:%s(%p) nlp:%s(%p) last(%p)\n",

//              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 __FUNCTION__": lp:%s(%p) mlp:%s(%p) last(%p) next(%p) mndq(%p)\n",

//              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 __FUNCTION__": mndq(%p)\n",

//              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;

}