]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/linux/hdlc.h
1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Generic HDLC support routines for Linux
5 * Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl>
11 #include <linux/skbuff.h>
12 #include <linux/netdevice.h>
13 #include <linux/hdlc/ioctl.h>
14 #include <uapi/linux/hdlc.h>
16 /* This structure is a private property of HDLC protocols.
17 Hardware drivers have no interest here */
20 int (*open
)(struct net_device
*dev
);
21 void (*close
)(struct net_device
*dev
);
22 void (*start
)(struct net_device
*dev
); /* if open & DCD */
23 void (*stop
)(struct net_device
*dev
); /* if open & !DCD */
24 void (*detach
)(struct net_device
*dev
);
25 int (*ioctl
)(struct net_device
*dev
, struct ifreq
*ifr
);
26 __be16 (*type_trans
)(struct sk_buff
*skb
, struct net_device
*dev
);
27 int (*netif_rx
)(struct sk_buff
*skb
);
28 netdev_tx_t (*xmit
)(struct sk_buff
*skb
, struct net_device
*dev
);
29 struct module
*module
;
30 struct hdlc_proto
*next
; /* next protocol in the list */
34 /* Pointed to by netdev_priv(dev) */
35 typedef struct hdlc_device
{
36 /* used by HDLC layer to take control over HDLC device from hw driver*/
37 int (*attach
)(struct net_device
*dev
,
38 unsigned short encoding
, unsigned short parity
);
40 /* hardware driver must handle this instead of dev->hard_start_xmit */
41 netdev_tx_t (*xmit
)(struct sk_buff
*skb
, struct net_device
*dev
);
43 /* Things below are for HDLC layer internal use only */
44 const struct hdlc_proto
*proto
;
47 spinlock_t state_lock
;
54 /* Exported from hdlc module */
56 /* Called by hardware driver when a user requests HDLC service */
57 int hdlc_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
);
59 /* Must be used by hardware driver on module startup/exit */
60 #define register_hdlc_device(dev) register_netdev(dev)
61 void unregister_hdlc_device(struct net_device
*dev
);
64 void register_hdlc_protocol(struct hdlc_proto
*proto
);
65 void unregister_hdlc_protocol(struct hdlc_proto
*proto
);
67 struct net_device
*alloc_hdlcdev(void *priv
);
69 static inline struct hdlc_device
* dev_to_hdlc(struct net_device
*dev
)
71 return netdev_priv(dev
);
74 static __inline__
void debug_frame(const struct sk_buff
*skb
)
78 for (i
=0; i
< skb
->len
; i
++) {
83 printk(" %02X", skb
->data
[i
]);
89 /* Must be called by hardware driver when HDLC device is being opened */
90 int hdlc_open(struct net_device
*dev
);
91 /* Must be called by hardware driver when HDLC device is being closed */
92 void hdlc_close(struct net_device
*dev
);
93 /* Must be pointed to by hw driver's dev->netdev_ops->ndo_start_xmit */
94 netdev_tx_t
hdlc_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
);
96 int attach_hdlc_protocol(struct net_device
*dev
, struct hdlc_proto
*proto
,
98 /* May be used by hardware driver to gain control over HDLC device */
99 int detach_hdlc_protocol(struct net_device
*dev
);
101 static __inline__ __be16
hdlc_type_trans(struct sk_buff
*skb
,
102 struct net_device
*dev
)
104 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
107 skb_reset_mac_header(skb
);
109 if (hdlc
->proto
->type_trans
)
110 return hdlc
->proto
->type_trans(skb
, dev
);
112 return htons(ETH_P_HDLC
);
115 #endif /* __HDLC_H */