[funini.com] -> [kei@sodan] -> Kernel Reading

root/include/linux/hdlc.h

/* [<][>][^][v][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. dev_to_hdlc
  2. debug_frame
  3. hdlc_type_trans

/*
 * 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


#define HDLC_MAX_MTU 1500       /* Ethernet 1500 bytes */
#if 0
#define HDLC_MAX_MRU (HDLC_MAX_MTU + 10 + 14 + 4) /* for ETH+VLAN over FR */
#else
#define HDLC_MAX_MRU 1600 /* as required for FR network */
#endif


#ifdef __KERNEL__

#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/hdlc/ioctl.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);
        struct module *module;
        struct hdlc_proto *next; /* next protocol in the list */
};


/* Pointed to by dev->priv */
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 */
        int (*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 dev->priv;
}

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");
}


/* 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);

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 */
void 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);
}

#endif /* __KERNEL */
#endif /* __HDLC_H */

/* [<][>][^][v][top][bottom][index][help] */

[funini.com] -> [kei@sodan] -> Kernel Reading