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[PATCH] Modularize generic HDLC

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This patch enables building of individual WAN protocol support
routines (parts of generic HDLC) as separate modules.
All protocol-private definitions are moved from hdlc.h file
to protocol drivers. User-space interface and interface
between generic HDLC and underlying low-level HDLC drivers
are unchanged.

Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Krzysztof Halasa
2006-09-26 23:23:45 +02:00
committed by Jeff Garzik
parent c226951b93
commit eb2a2fd91f
11 changed files with 739 additions and 504 deletions
Download Patch File Download Diff File Expand all files Collapse all files

199
include/linux/hdlc.h
View File

@ -11,95 +11,46 @@
#ifndef __HDLC_H
#define __HDLC_H
#define GENERIC_HDLC_VERSION 4 /* For synchronization with sethdlc utility */
#define CLOCK_DEFAULT 0 /* Default setting */
#define CLOCK_EXT 1 /* External TX and RX clock - DTE */
#define CLOCK_INT 2 /* Internal TX and RX clock - DCE */
#define CLOCK_TXINT 3 /* Internal TX and external RX clock */
#define CLOCK_TXFROMRX 4 /* TX clock derived from external RX clock */
#define ENCODING_DEFAULT 0 /* Default setting */
#define ENCODING_NRZ 1
#define ENCODING_NRZI 2
#define ENCODING_FM_MARK 3
#define ENCODING_FM_SPACE 4
#define ENCODING_MANCHESTER 5
#define PARITY_DEFAULT 0 /* Default setting */
#define PARITY_NONE 1 /* No parity */
#define PARITY_CRC16_PR0 2 /* CRC16, initial value 0x0000 */
#define PARITY_CRC16_PR1 3 /* CRC16, initial value 0xFFFF */
#define PARITY_CRC16_PR0_CCITT 4 /* CRC16, initial 0x0000, ITU-T version */
#define PARITY_CRC16_PR1_CCITT 5 /* CRC16, initial 0xFFFF, ITU-T version */
#define PARITY_CRC32_PR0_CCITT 6 /* CRC32, initial value 0x00000000 */
#define PARITY_CRC32_PR1_CCITT 7 /* CRC32, initial value 0xFFFFFFFF */
#define LMI_DEFAULT 0 /* Default setting */
#define LMI_NONE 1 /* No LMI, all PVCs are static */
#define LMI_ANSI 2 /* ANSI Annex D */
#define LMI_CCITT 3 /* ITU-T Annex A */
#define LMI_CISCO 4 /* The "original" LMI, aka Gang of Four */
#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 <net/syncppp.h>
#include <linux/hdlc/ioctl.h>
typedef struct { /* Used in Cisco and PPP mode */
u8 address;
u8 control;
u16 protocol;
}__attribute__ ((packed)) hdlc_header;
typedef struct {
u32 type; /* code */
u32 par1;
u32 par2;
u16 rel; /* reliability */
u32 time;
}__attribute__ ((packed)) cisco_packet;
#define CISCO_PACKET_LEN 18
#define CISCO_BIG_PACKET_LEN 20
typedef struct pvc_device_struct {
struct net_device *master;
struct net_device *main;
struct net_device *ether; /* bridged Ethernet interface */
struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
int dlci;
int open_count;
struct {
unsigned int new: 1;
unsigned int active: 1;
unsigned int exist: 1;
unsigned int deleted: 1;
unsigned int fecn: 1;
unsigned int becn: 1;
unsigned int bandwidth; /* Cisco LMI reporting only */
}state;
}pvc_device;
typedef struct hdlc_device_struct {
/* To be initialized by hardware driver */
/* Used by all network devices here, pointed to by netdev_priv(dev) */
struct hdlc_device_desc {
int (*netif_rx)(struct sk_buff *skb);
struct net_device_stats stats;
};
/* 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);
unsigned short (*type_trans)(struct sk_buff *skb,
struct net_device *dev);
struct module *module;
struct hdlc_proto *next; /* next protocol in the list */
};
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);
@ -107,82 +58,18 @@ typedef struct hdlc_device_struct {
/* 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 */
struct {
int (*open)(struct net_device *dev);
void (*close)(struct net_device *dev);
/* if open & DCD */
void (*start)(struct net_device *dev);
/* if open & !DCD */
void (*stop)(struct net_device *dev);
void (*detach)(struct hdlc_device_struct *hdlc);
int (*netif_rx)(struct sk_buff *skb);
unsigned short (*type_trans)(struct sk_buff *skb,
struct net_device *dev);
int id; /* IF_PROTO_HDLC/CISCO/FR/etc. */
}proto;
const struct hdlc_proto *proto;
int carrier;
int open;
spinlock_t state_lock;
union {
struct {
fr_proto settings;
pvc_device *first_pvc;
int dce_pvc_count;
struct timer_list timer;
unsigned long last_poll;
int reliable;
int dce_changed;
int request;
int fullrep_sent;
u32 last_errors; /* last errors bit list */
u8 n391cnt;
u8 txseq; /* TX sequence number */
u8 rxseq; /* RX sequence number */
}fr;
struct {
cisco_proto settings;
struct timer_list timer;
unsigned long last_poll;
int up;
int request_sent;
u32 txseq; /* TX sequence number */
u32 rxseq; /* RX sequence number */
}cisco;
struct {
raw_hdlc_proto settings;
}raw_hdlc;
struct {
struct ppp_device pppdev;
struct ppp_device *syncppp_ptr;
int (*old_change_mtu)(struct net_device *dev,
int new_mtu);
}ppp;
}state;
void *state;
void *priv;
}hdlc_device;
int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr);
int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr);
int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr);
int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr);
int hdlc_x25_ioctl(struct net_device *dev, struct ifreq *ifr);
/* Exported from hdlc.o */
/* 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);
@ -191,17 +78,21 @@ int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
#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__ hdlc_device* dev_to_hdlc(struct net_device *dev)
static __inline__ struct hdlc_device_desc* dev_to_desc(struct net_device *dev)
{
return netdev_priv(dev);
}
static __inline__ pvc_device* dev_to_pvc(struct net_device *dev)
static __inline__ hdlc_device* dev_to_hdlc(struct net_device *dev)
{
return (pvc_device*)dev->priv;
return netdev_priv(dev) + sizeof(struct hdlc_device_desc);
}
@ -225,18 +116,14 @@ 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,
int (*rx)(struct sk_buff *skb), size_t size);
/* May be used by hardware driver to gain control over HDLC device */
static __inline__ void hdlc_proto_detach(hdlc_device *hdlc)
{
if (hdlc->proto.detach)
hdlc->proto.detach(hdlc);
hdlc->proto.detach = NULL;
}
void detach_hdlc_protocol(struct net_device *dev);
static __inline__ struct net_device_stats *hdlc_stats(struct net_device *dev)
{
return &dev_to_hdlc(dev)->stats;
return &dev_to_desc(dev)->stats;
}
@ -248,8 +135,8 @@ static __inline__ __be16 hdlc_type_trans(struct sk_buff *skb,
skb->mac.raw = skb->data;
skb->dev = dev;
if (hdlc->proto.type_trans)
return hdlc->proto.type_trans(skb, dev);
if (hdlc->proto->type_trans)
return hdlc->proto->type_trans(skb, dev);
else
return htons(ETH_P_HDLC);
}