summaryrefslogtreecommitdiffstats
path: root/drivers/isdn/i4l/isdn_net.h
blob: be4949715d55f605206f99e86430fe0c46ff1f1d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/* $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",
//		__func__, 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",
//		__func__, 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",
//		__func__, 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;
}