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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/hdlc.h
2 * Generic HDLC support routines for Linux
4 * Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License
8 * as published by the Free Software Foundation.
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/hdlc/ioctl.h>
17 #include <uapi/linux/hdlc.h>
19 /* This structure is a private property of HDLC protocols.
20 Hardware drivers have no interest here */
23 int (*open
)(struct net_device
*dev
);
24 void (*close
)(struct net_device
*dev
);
25 void (*start
)(struct net_device
*dev
); /* if open & DCD */
26 void (*stop
)(struct net_device
*dev
); /* if open & !DCD */
27 void (*detach
)(struct net_device
*dev
);
28 int (*ioctl
)(struct net_device
*dev
, struct ifreq
*ifr
);
29 __be16 (*type_trans
)(struct sk_buff
*skb
, struct net_device
*dev
);
30 int (*netif_rx
)(struct sk_buff
*skb
);
31 netdev_tx_t (*xmit
)(struct sk_buff
*skb
, struct net_device
*dev
);
32 struct module
*module
;
33 struct hdlc_proto
*next
; /* next protocol in the list */
37 /* Pointed to by netdev_priv(dev) */
38 typedef struct hdlc_device
{
39 /* used by HDLC layer to take control over HDLC device from hw driver*/
40 int (*attach
)(struct net_device
*dev
,
41 unsigned short encoding
, unsigned short parity
);
43 /* hardware driver must handle this instead of dev->hard_start_xmit */
44 netdev_tx_t (*xmit
)(struct sk_buff
*skb
, struct net_device
*dev
);
46 /* Things below are for HDLC layer internal use only */
47 const struct hdlc_proto
*proto
;
50 spinlock_t state_lock
;
57 /* Exported from hdlc module */
59 /* Called by hardware driver when a user requests HDLC service */
60 int hdlc_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
);
62 /* Must be used by hardware driver on module startup/exit */
63 #define register_hdlc_device(dev) register_netdev(dev)
64 void unregister_hdlc_device(struct net_device
*dev
);
67 void register_hdlc_protocol(struct hdlc_proto
*proto
);
68 void unregister_hdlc_protocol(struct hdlc_proto
*proto
);
70 struct net_device
*alloc_hdlcdev(void *priv
);
72 static inline struct hdlc_device
* dev_to_hdlc(struct net_device
*dev
)
74 return netdev_priv(dev
);
77 static __inline__
void debug_frame(const struct sk_buff
*skb
)
81 for (i
=0; i
< skb
->len
; i
++) {
86 printk(" %02X", skb
->data
[i
]);
92 /* Must be called by hardware driver when HDLC device is being opened */
93 int hdlc_open(struct net_device
*dev
);
94 /* Must be called by hardware driver when HDLC device is being closed */
95 void hdlc_close(struct net_device
*dev
);
96 /* Must be pointed to by hw driver's dev->netdev_ops->ndo_start_xmit */
97 netdev_tx_t
hdlc_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
);
99 int attach_hdlc_protocol(struct net_device
*dev
, struct hdlc_proto
*proto
,
101 /* May be used by hardware driver to gain control over HDLC device */
102 int detach_hdlc_protocol(struct net_device
*dev
);
104 static __inline__ __be16
hdlc_type_trans(struct sk_buff
*skb
,
105 struct net_device
*dev
)
107 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
110 skb_reset_mac_header(skb
);
112 if (hdlc
->proto
->type_trans
)
113 return hdlc
->proto
->type_trans(skb
, dev
);
115 return htons(ETH_P_HDLC
);
118 #endif /* __HDLC_H */