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isdn_net.h
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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 ([email protected])
6  * Copyright 1995,96 by Thinking Objects Software GmbH Wuerzburg
7  * Copyright 1995,96 by Michael Hipp ([email protected])
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 
34 extern char *isdn_net_new(char *, struct net_device *);
35 extern char *isdn_net_newslave(char *);
36 extern int isdn_net_rm(char *);
37 extern int isdn_net_rmall(void);
38 extern int isdn_net_stat_callback(int, isdn_ctrl *);
42 extern int isdn_net_getphones(isdn_net_ioctl_phone *, char __user *);
45 extern int isdn_net_find_icall(int, int, int, setup_parm *);
46 extern void isdn_net_hangup(struct net_device *);
47 extern void isdn_net_dial(void);
48 extern void isdn_net_autohup(void);
49 extern int isdn_net_force_hangup(char *);
50 extern int isdn_net_force_dial(char *);
51 extern isdn_net_dev *isdn_net_findif(char *);
52 extern int isdn_net_rcv_skb(int, struct sk_buff *);
53 extern int isdn_net_dial_req(isdn_net_local *);
54 extern void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb);
55 extern 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  */
67 static __inline__ int isdn_net_lp_busy(isdn_net_local *lp)
68 {
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  */
79 static __inline__ isdn_net_local *isdn_net_get_locked_lp(isdn_net_dev *nd)
80 {
81  unsigned long flags;
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);
98  return lp;
99 errout:
100  spin_unlock_irqrestore(&nd->queue_lock, flags);
101  return lp;
102 }
103 
104 /*
105  * add a channel to a bundle
106  */
107 static __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  */
128 static __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 }