Release 4.7 include/linux/hdlc.h

/*
 * Generic HDLC support routines for Linux
 *
 * Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 */
#ifndef __HDLC_H

#define __HDLC_H


#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/hdlc/ioctl.h>
#include <uapi/linux/hdlc.h>

/* This structure is a private property of HDLC protocols.
   Hardware drivers have no interest here */


struct hdlc_proto {
	
int (*open)(struct net_device *dev);
	
void (*close)(struct net_device *dev);
	
void (*start)(struct net_device *dev); /* if open & DCD */
	
void (*stop)(struct net_device *dev); /* if open & !DCD */
	
void (*detach)(struct net_device *dev);
	
int (*ioctl)(struct net_device *dev, struct ifreq *ifr);
	
__be16 (*type_trans)(struct sk_buff *skb, struct net_device *dev);
	
int (*netif_rx)(struct sk_buff *skb);
	
netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);
	
struct module *module;
	
struct hdlc_proto *next; /* next protocol in the list */
};


/* Pointed to by netdev_priv(dev) */

typedef struct hdlc_device {
	/* used by HDLC layer to take control over HDLC device from hw driver*/
	
int (*attach)(struct net_device *dev,
		      unsigned short encoding, unsigned short parity);

	/* hardware driver must handle this instead of dev->hard_start_xmit */
	
netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);

	/* Things below are for HDLC layer internal use only */
	
const struct hdlc_proto *proto;
	
int carrier;
	
int open;
	
spinlock_t state_lock;
	
void *state;
	
void *priv;
} 
hdlc_device;



/* Exported from hdlc module */

/* Called by hardware driver when a user requests HDLC service */
int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);

/* Must be used by hardware driver on module startup/exit */

#define register_hdlc_device(dev)	register_netdev(dev)
void unregister_hdlc_device(struct net_device *dev);


void register_hdlc_protocol(struct hdlc_proto *proto);
void unregister_hdlc_protocol(struct hdlc_proto *proto);

struct net_device *alloc_hdlcdev(void *priv);



static inline struct hdlc_device* dev_to_hdlc(struct net_device *dev)
{
	return netdev_priv(dev);
}

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static __inline__ void debug_frame(const struct sk_buff *skb)
{
	int i;

	for (i=0; i < skb->len; i++) {
		if (i == 100) {
			printk("...\n");
			return;
		}
		printk(" %02X", skb->data[i]);
	}
	printk("\n");
}


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/* Must be called by hardware driver when HDLC device is being opened */
int hdlc_open(struct net_device *dev);
/* Must be called by hardware driver when HDLC device is being closed */
void hdlc_close(struct net_device *dev);
/* May be used by hardware driver */
int hdlc_change_mtu(struct net_device *dev, int new_mtu);
/* Must be pointed to by hw driver's dev->netdev_ops->ndo_start_xmit */
netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev);

int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto,
			 size_t size);
/* May be used by hardware driver to gain control over HDLC device */
int detach_hdlc_protocol(struct net_device *dev);



static __inline__ __be16 hdlc_type_trans(struct sk_buff *skb,
					 struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);

	skb->dev = dev;
	skb_reset_mac_header(skb);

	if (hdlc->proto->type_trans)
		return hdlc->proto->type_trans(skb, dev);
	else
		return htons(ETH_P_HDLC);
}

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#endif /* __HDLC_H */
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linus torvalds
123
23.56%
2
6.90%
francois romieu
francois romieu
64
12.26%
2
6.90%
al viro
al viro
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7.09%
9
31.03%
arnaldo carvalho de melo
arnaldo carvalho de melo
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2.30%
2
6.90%
wang chen
wang chen
4
0.77%
2
6.90%
stephen hemminger
stephen hemminger
3
0.57%
1
3.45%
david howells
david howells
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andrew lunn
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