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#define ISDN_MASTER_PRIV(lp) ((isdn_net_local *) netdev_priv(lp->master))
  60#define ISDN_SLAVE_PRIV(lp) ((isdn_net_local *) netdev_priv(lp->slave))
  61#define MASTER_TO_SLAVE(master) \
  62                        (((isdn_net_local *) netdev_priv(master))->slave)
  63
  64/*
  65 * is this particular channel busy?
  66 */
  67static __inline__ int isdn_net_lp_busy(isdn_net_local *lp)
  68{
  69        if (atomic_read(&lp->frame_cnt) < ISDN_NET_MAX_QUEUE_LENGTH)
  70                return 0;
  71        else 
  72                return 1;
  73}
  74
  75/*
  76 * For the given net device, this will get a non-busy channel out of the
  77 * corresponding bundle. The returned channel is locked.
  78 */
  79static __inline__ isdn_net_local * isdn_net_get_locked_lp(isdn_net_dev *nd)
  80{
  81        unsigned long flags;
  82        isdn_net_local *lp;
  83
  84        spin_lock_irqsave(&nd->queue_lock, flags);
  85        lp = nd->queue;         /* get lp on top of queue */
  86        while (isdn_net_lp_busy(nd->queue)) {
  87                nd->queue = nd->queue->next;
  88                if (nd->queue == lp) { /* not found -- should never happen */
  89                        lp = NULL;
  90                        goto errout;
  91                }
  92        }
  93        lp = nd->queue;
  94        nd->queue = nd->queue->next;
  95        spin_unlock_irqrestore(&nd->queue_lock, flags);
  96        spin_lock(&lp->xmit_lock);
  97        local_bh_disable();
  98        return lp;
  99errout:
 100        spin_unlock_irqrestore(&nd->queue_lock, flags);
 101        return lp;
 102}
 103
 104/*
 105 * add a channel to a bundle
 106 */
 107static __inline__ void isdn_net_add_to_bundle(isdn_net_dev *nd, isdn_net_local *nlp)
 108{
 109        isdn_net_local *lp;
 110        unsigned long flags;
 111
 112        spin_lock_irqsave(&nd->queue_lock, flags);
 113
 114        lp = nd->queue;
 115//      printk(KERN_DEBUG "%s: lp:%s(%p) nlp:%s(%p) last(%p)\n",
 116//              __func__, lp->name, lp, nlp->name, nlp, lp->last);
 117        nlp->last = lp->last;
 118        lp->last->next = nlp;
 119        lp->last = nlp;
 120        nlp->next = lp;
 121        nd->queue = nlp;
 122
 123        spin_unlock_irqrestore(&nd->queue_lock, flags);
 124}
 125/*
 126 * remove a channel from the bundle it belongs to
 127 */
 128static __inline__ void isdn_net_rm_from_bundle(isdn_net_local *lp)
 129{
 130        isdn_net_local *master_lp = lp;
 131        unsigned long flags;
 132
 133        if (lp->master)
 134                master_lp = ISDN_MASTER_PRIV(lp);
 135
 136//      printk(KERN_DEBUG "%s: lp:%s(%p) mlp:%s(%p) last(%p) next(%p) mndq(%p)\n",
 137//              __func__, lp->name, lp, master_lp->name, master_lp, lp->last, lp->next, master_lp->netdev->queue);
 138        spin_lock_irqsave(&master_lp->netdev->queue_lock, flags);
 139        lp->last->next = lp->next;
 140        lp->next->last = lp->last;
 141        if (master_lp->netdev->queue == lp) {
 142                master_lp->netdev->queue = lp->next;
 143                if (lp->next == lp) { /* last in queue */
 144                        master_lp->netdev->queue = master_lp->netdev->local;
 145                }
 146        }
 147        lp->next = lp->last = lp;       /* (re)set own pointers */
 148//      printk(KERN_DEBUG "%s: mndq(%p)\n",
 149//              __func__, master_lp->netdev->queue);
 150        spin_unlock_irqrestore(&master_lp->netdev->queue_lock, flags);
 151}
 152
 153