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118 lines
3.3 KiB
118 lines
3.3 KiB
/* |
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* Generic HDLC support routines for Linux |
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* |
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* Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of version 2 of the GNU General Public License |
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* as published by the Free Software Foundation. |
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*/ |
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#ifndef __HDLC_H |
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#define __HDLC_H |
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#include <linux/skbuff.h> |
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#include <linux/netdevice.h> |
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#include <linux/hdlc/ioctl.h> |
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#include <uapi/linux/hdlc.h> |
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/* This structure is a private property of HDLC protocols. |
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Hardware drivers have no interest here */ |
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struct hdlc_proto { |
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int (*open)(struct net_device *dev); |
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void (*close)(struct net_device *dev); |
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void (*start)(struct net_device *dev); /* if open & DCD */ |
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void (*stop)(struct net_device *dev); /* if open & !DCD */ |
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void (*detach)(struct net_device *dev); |
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int (*ioctl)(struct net_device *dev, struct ifreq *ifr); |
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__be16 (*type_trans)(struct sk_buff *skb, struct net_device *dev); |
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int (*netif_rx)(struct sk_buff *skb); |
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netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev); |
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struct module *module; |
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struct hdlc_proto *next; /* next protocol in the list */ |
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}; |
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/* Pointed to by netdev_priv(dev) */ |
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typedef struct hdlc_device { |
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/* used by HDLC layer to take control over HDLC device from hw driver*/ |
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int (*attach)(struct net_device *dev, |
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unsigned short encoding, unsigned short parity); |
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/* hardware driver must handle this instead of dev->hard_start_xmit */ |
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netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev); |
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/* Things below are for HDLC layer internal use only */ |
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const struct hdlc_proto *proto; |
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int carrier; |
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int open; |
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spinlock_t state_lock; |
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void *state; |
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void *priv; |
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} hdlc_device; |
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/* Exported from hdlc module */ |
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/* Called by hardware driver when a user requests HDLC service */ |
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int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); |
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/* Must be used by hardware driver on module startup/exit */ |
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#define register_hdlc_device(dev) register_netdev(dev) |
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void unregister_hdlc_device(struct net_device *dev); |
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void register_hdlc_protocol(struct hdlc_proto *proto); |
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void unregister_hdlc_protocol(struct hdlc_proto *proto); |
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struct net_device *alloc_hdlcdev(void *priv); |
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static inline struct hdlc_device* dev_to_hdlc(struct net_device *dev) |
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{ |
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return netdev_priv(dev); |
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} |
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static __inline__ void debug_frame(const struct sk_buff *skb) |
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{ |
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int i; |
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for (i=0; i < skb->len; i++) { |
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if (i == 100) { |
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printk("...\n"); |
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return; |
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} |
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printk(" %02X", skb->data[i]); |
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} |
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printk("\n"); |
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} |
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/* Must be called by hardware driver when HDLC device is being opened */ |
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int hdlc_open(struct net_device *dev); |
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/* Must be called by hardware driver when HDLC device is being closed */ |
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void hdlc_close(struct net_device *dev); |
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/* Must be pointed to by hw driver's dev->netdev_ops->ndo_start_xmit */ |
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netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev); |
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int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto, |
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size_t size); |
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/* May be used by hardware driver to gain control over HDLC device */ |
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int detach_hdlc_protocol(struct net_device *dev); |
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static __inline__ __be16 hdlc_type_trans(struct sk_buff *skb, |
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struct net_device *dev) |
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{ |
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hdlc_device *hdlc = dev_to_hdlc(dev); |
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skb->dev = dev; |
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skb_reset_mac_header(skb); |
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if (hdlc->proto->type_trans) |
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return hdlc->proto->type_trans(skb, dev); |
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else |
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return htons(ETH_P_HDLC); |
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} |
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#endif /* __HDLC_H */
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