LXR linux/drivers/isdn/i4l/isdn

   1/* $Id: isdn_net.h,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
   2 *
   3 * header for Linux ISDN subsystem, network related functions (linklevel).
   4 *
   5 * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
   6 * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
   7 * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
   8 *
   9 * This software may be used and distributed according to the terms
  10 * of the GNU General Public License, incorporated herein by reference.
  11 *
  12 */
  13
  14                              /* Definitions for hupflags:                */
  15#define ISDN_WAITCHARGE  1      /* did not get a charge info yet            */
  16#define ISDN_HAVECHARGE  2      /* We know a charge info                    */
  17#define ISDN_CHARGEHUP   4      /* We want to use the charge mechanism      */
  18#define ISDN_INHUP       8      /* Even if incoming, close after huptimeout */
  19#define ISDN_MANCHARGE  16      /* Charge Interval manually set             */
  20
  21/*
  22 * Definitions for Cisco-HDLC header.
  23 */
  24
  25#define CISCO_ADDR_UNICAST    0x0f
  26#define CISCO_ADDR_BROADCAST  0x8f
  27#define CISCO_CTRL            0x00
  28#define CISCO_TYPE_CDP        0x2000
  29#define CISCO_TYPE_SLARP      0x8035
  30#define CISCO_SLARP_REQUEST   0
  31#define CISCO_SLARP_REPLY     1
  32#define CISCO_SLARP_KEEPALIVE 2
  33
  34extern char *isdn_net_new(char *, struct net_device *);
  35extern char *isdn_net_newslave(char *);
  36extern int isdn_net_rm(char *);
  37extern int isdn_net_rmall(void);
  38extern int isdn_net_stat_callback(int, isdn_ctrl *);
  39extern int isdn_net_setcfg(isdn_net_ioctl_cfg *);
  40extern int isdn_net_getcfg(isdn_net_ioctl_cfg *);
  41extern int isdn_net_addphone(isdn_net_ioctl_phone *);
  42extern int isdn_net_getphones(isdn_net_ioctl_phone *, char __user *);
  43extern int isdn_net_getpeer(isdn_net_ioctl_phone *, isdn_net_ioctl_phone __user *);
  44extern int isdn_net_delphone(isdn_net_ioctl_phone *);
  45extern int isdn_net_find_icall(int, int, int, setup_parm *);
  46extern void isdn_net_hangup(struct net_device *);
  47extern void isdn_net_dial(void);
  48extern void isdn_net_autohup(void);
  49extern int isdn_net_force_hangup(char *);
  50extern int isdn_net_force_dial(char *);
  51extern isdn_net_dev *isdn_net_findif(char *);
  52extern int isdn_net_rcv_skb(int, struct sk_buff *);
  53extern int isdn_net_dial_req(isdn_net_local *);
  54extern void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb);
  55extern void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb);
  56
  57#define ISDN_NET_MAX_QUEUE_LENGTH 2
  58
  59/*
  60 * is this particular channel busy?
  61 */
  62static __inline__ int isdn_net_lp_busy(isdn_net_local *lp)
  63{
  64        if (atomic_read(&lp->frame_cnt) < ISDN_NET_MAX_QUEUE_LENGTH)
  65                return 0;
  66        else 
  67                return 1;
  68}
  69
  70/*
  71 * For the given net device, this will get a non-busy channel out of the
  72 * corresponding bundle. The returned channel is locked.
  73 */
  74static __inline__ isdn_net_local * isdn_net_get_locked_lp(isdn_net_dev *nd)
  75{
  76        unsigned long flags;
  77        isdn_net_local *lp;
  78
  79        spin_lock_irqsave(&nd->queue_lock, flags);
  80        lp = nd->queue;         /* get lp on top of queue */
  81        spin_lock(&nd->queue->xmit_lock);
  82        while (isdn_net_lp_busy(nd->queue)) {
  83                spin_unlock(&nd->queue->xmit_lock);
  84                nd->queue = nd->queue->next;
  85                if (nd->queue == lp) { /* not found -- should never happen */
  86                        lp = NULL;
  87                        goto errout;
  88                }
  89                spin_lock(&nd->queue->xmit_lock);
  90        }
  91        lp = nd->queue;
  92        nd->queue = nd->queue->next;
  93        local_bh_disable();
  94errout:
  95        spin_unlock_irqrestore(&nd->queue_lock, flags);
  96        return lp;
  97}
  98
  99/*
 100 * add a channel to a bundle
 101 */
 102static __inline__ void isdn_net_add_to_bundle(isdn_net_dev *nd, isdn_net_local *nlp)
 103{
 104        isdn_net_local *lp;
 105        unsigned long flags;
 106
 107        spin_lock_irqsave(&nd->queue_lock, flags);
 108
 109        lp = nd->queue;
 110//      printk(KERN_DEBUG "%s: lp:%s(%p) nlp:%s(%p) last(%p)\n",
 111//              __func__, lp->name, lp, nlp->name, nlp, lp->last);
 112        nlp->last = lp->last;
 113        lp->last->next = nlp;
 114        lp->last = nlp;
 115        nlp->next = lp;
 116        nd->queue = nlp;
 117
 118        spin_unlock_irqrestore(&nd->queue_lock, flags);
 119}
 120/*
 121 * remove a channel from the bundle it belongs to
 122 */
 123static __inline__ void isdn_net_rm_from_bundle(isdn_net_local *lp)
 124{
 125        isdn_net_local *master_lp = lp;
 126        unsigned long flags;
 127
 128        if (lp->master)
 129                master_lp = (isdn_net_local *) lp->master->priv;
 130
 131//      printk(KERN_DEBUG "%s: lp:%s(%p) mlp:%s(%p) last(%p) next(%p) mndq(%p)\n",
 132//              __func__, lp->name, lp, master_lp->name, master_lp, lp->last, lp->next, master_lp->netdev->queue);
 133        spin_lock_irqsave(&master_lp->netdev->queue_lock, flags);
 134        lp->last->next = lp->next;
 135        lp->next->last = lp->last;
 136        if (master_lp->netdev->queue == lp) {
 137                master_lp->netdev->queue = lp->next;
 138                if (lp->next == lp) { /* last in queue */
 139                        master_lp->netdev->queue = master_lp->netdev->local;
 140                }
 141        }
 142        lp->next = lp->last = lp;       /* (re)set own pointers */
 143//      printk(KERN_DEBUG "%s: mndq(%p)\n",
 144//              __func__, master_lp->netdev->queue);
 145        spin_unlock_irqrestore(&master_lp->netdev->queue_lock, flags);
 146}
 147
 148static inline int
 149put_u8(unsigned char *p, u8 x)
 150{
 151        *p = x;
 152        return 1;
 153}
 154
 155static inline int
 156put_u16(unsigned char *p, u16 x)
 157{
 158        *((u16 *)p) = htons(x);
 159        return 2;
 160}
 161
 162static inline int
 163put_u32(unsigned char *p, u32 x)
 164{
 165        *((u32 *)p) = htonl(x);
 166        return 4;
 167}
 168
 169static inline int
 170get_u8(unsigned char *p, u8 *x)
 171{
 172        *x = *p;
 173        return 1;
 174}
 175
 176static inline int
 177get_u16(unsigned char *p, u16 *x)
 178{
 179        *x = ntohs(*((u16 *)p));
 180        return 2;
 181}
 182
 183static inline int
 184get_u32(unsigned char *p, u32 *x)
 185{
 186        *x = ntohl(*((u32 *)p));
 187        return 4;
 188}
 189
 190
 191