diff options
Diffstat (limited to 'drivers/isdn/i4l/isdn_net.h')
| -rw-r--r-- | drivers/isdn/i4l/isdn_net.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/drivers/isdn/i4l/isdn_net.h b/drivers/isdn/i4l/isdn_net.h new file mode 100644 index 000000000000..bc2f0dd962ea --- /dev/null +++ b/drivers/isdn/i4l/isdn_net.h @@ -0,0 +1,190 @@ +/* $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", +// __FUNCTION__, 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", +// __FUNCTION__, 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", +// __FUNCTION__, 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; +} + + |