[PATCH] Modularize generic HDLC

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>

1 files changed, 0 insertions, 339 deletions

diff --git a/drivers/net/wan/hdlc_generic.c b/drivers/net/wan/hdlc_generic.c
deleted file mode 100644
index 04ca1f7b6424..000000000000
--- a/drivers/net/wan/hdlc_generic.c
+++ /dev/null
@@ -1,339 +0,0 @@
-/*
- * 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.
- *
- * Currently supported:
- *	* raw IP-in-HDLC
- *	* Cisco HDLC
- *	* Frame Relay with ANSI or CCITT LMI (both user and network side)
- *	* PPP
- *	* X.25
- *
- * Use sethdlc utility to set line parameters, protocol and PVCs
- *
- * How does it work:
- * - proto.open(), close(), start(), stop() calls are serialized.
- *   The order is: open, [ start, stop ... ] close ...
- * - proto.start() and stop() are called with spin_lock_irq held.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/poll.h>
-#include <linux/errno.h>
-#include <linux/if_arp.h>
-#include <linux/init.h>
-#include <linux/skbuff.h>
-#include <linux/pkt_sched.h>
-#include <linux/inetdevice.h>
-#include <linux/lapb.h>
-#include <linux/rtnetlink.h>
-#include <linux/notifier.h>
-#include <linux/hdlc.h>
-
-
-static const char* version = "HDLC support module revision 1.19";
-
-#undef DEBUG_LINK
-
-
-static int hdlc_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
-
-
-static struct net_device_stats *hdlc_get_stats(struct net_device *dev)
-{
-	return hdlc_stats(dev);
-}
-
-
-
-static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
-		    struct packet_type *p, struct net_device *orig_dev)
-{
-	hdlc_device *hdlc = dev_to_hdlc(dev);
-	if (hdlc->proto.netif_rx)
-		return hdlc->proto.netif_rx(skb);
-
-	hdlc->stats.rx_dropped++; /* Shouldn't happen */
-	dev_kfree_skb(skb);
-	return NET_RX_DROP;
-}
-
-
-
-static inline void hdlc_proto_start(struct net_device *dev)
-{
-	hdlc_device *hdlc = dev_to_hdlc(dev);
-	if (hdlc->proto.start)
-		return hdlc->proto.start(dev);
-}
-
-
-
-static inline void hdlc_proto_stop(struct net_device *dev)
-{
-	hdlc_device *hdlc = dev_to_hdlc(dev);
-	if (hdlc->proto.stop)
-		return hdlc->proto.stop(dev);
-}
-
-
-
-static int hdlc_device_event(struct notifier_block *this, unsigned long event,
-			     void *ptr)
-{
-	struct net_device *dev = ptr;
-	hdlc_device *hdlc;
-	unsigned long flags;
-	int on;
- 
-	if (dev->get_stats != hdlc_get_stats)
-		return NOTIFY_DONE; /* not an HDLC device */
- 
-	if (event != NETDEV_CHANGE)
-		return NOTIFY_DONE; /* Only interrested in carrier changes */
-
-	on = netif_carrier_ok(dev);
-
-#ifdef DEBUG_LINK
-	printk(KERN_DEBUG "%s: hdlc_device_event NETDEV_CHANGE, carrier %i\n",
-	       dev->name, on);
-#endif
-
-	hdlc = dev_to_hdlc(dev);
-	spin_lock_irqsave(&hdlc->state_lock, flags);
-
-	if (hdlc->carrier == on)
-		goto carrier_exit; /* no change in DCD line level */
-
-	hdlc->carrier = on;
-
-	if (!hdlc->open)
-		goto carrier_exit;
-
-	if (hdlc->carrier) {
-		printk(KERN_INFO "%s: Carrier detected\n", dev->name);
-		hdlc_proto_start(dev);
-	} else {
-		printk(KERN_INFO "%s: Carrier lost\n", dev->name);
-		hdlc_proto_stop(dev);
-	}
-
-carrier_exit:
-	spin_unlock_irqrestore(&hdlc->state_lock, flags);
-	return NOTIFY_DONE;
-}
-
-
-
-/* Must be called by hardware driver when HDLC device is being opened */
-int hdlc_open(struct net_device *dev)
-{
-	hdlc_device *hdlc = dev_to_hdlc(dev);
-#ifdef DEBUG_LINK
-	printk(KERN_DEBUG "hdlc_open() carrier %i open %i\n",
-	       hdlc->carrier, hdlc->open);
-#endif
-
-	if (hdlc->proto.id == -1)
-		return -ENOSYS;	/* no protocol attached */
-
-	if (hdlc->proto.open) {
-		int result = hdlc->proto.open(dev);
-		if (result)
-			return result;
-	}
-
-	spin_lock_irq(&hdlc->state_lock);
-
-	if (hdlc->carrier) {
-		printk(KERN_INFO "%s: Carrier detected\n", dev->name);
-		hdlc_proto_start(dev);
-	} else
-		printk(KERN_INFO "%s: No carrier\n", dev->name);
-
-	hdlc->open = 1;
-
-	spin_unlock_irq(&hdlc->state_lock);
-	return 0;
-}
-
-
-
-/* Must be called by hardware driver when HDLC device is being closed */
-void hdlc_close(struct net_device *dev)
-{
-	hdlc_device *hdlc = dev_to_hdlc(dev);
-#ifdef DEBUG_LINK
-	printk(KERN_DEBUG "hdlc_close() carrier %i open %i\n",
-	       hdlc->carrier, hdlc->open);
-#endif
-
-	spin_lock_irq(&hdlc->state_lock);
-
-	hdlc->open = 0;
-	if (hdlc->carrier)
-		hdlc_proto_stop(dev);
-
-	spin_unlock_irq(&hdlc->state_lock);
-
-	if (hdlc->proto.close)
-		hdlc->proto.close(dev);
-}
-
-
-
-#ifndef CONFIG_HDLC_RAW
-#define hdlc_raw_ioctl(dev, ifr)	-ENOSYS
-#endif
-
-#ifndef CONFIG_HDLC_RAW_ETH
-#define hdlc_raw_eth_ioctl(dev, ifr)	-ENOSYS
-#endif
-
-#ifndef CONFIG_HDLC_PPP
-#define hdlc_ppp_ioctl(dev, ifr)	-ENOSYS
-#endif
-
-#ifndef CONFIG_HDLC_CISCO
-#define hdlc_cisco_ioctl(dev, ifr)	-ENOSYS
-#endif
-
-#ifndef CONFIG_HDLC_FR
-#define hdlc_fr_ioctl(dev, ifr)		-ENOSYS
-#endif
-
-#ifndef CONFIG_HDLC_X25
-#define hdlc_x25_ioctl(dev, ifr)	-ENOSYS
-#endif
-
-
-int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
-{
-	hdlc_device *hdlc = dev_to_hdlc(dev);
-	unsigned int proto;
-
-	if (cmd != SIOCWANDEV)
-		return -EINVAL;
-
-	switch(ifr->ifr_settings.type) {
-	case IF_PROTO_HDLC:
-	case IF_PROTO_HDLC_ETH:
-	case IF_PROTO_PPP:
-	case IF_PROTO_CISCO:
-	case IF_PROTO_FR:
-	case IF_PROTO_X25:
-		proto = ifr->ifr_settings.type;
-		break;
-
-	default:
-		proto = hdlc->proto.id;
-	}
-
-	switch(proto) {
-	case IF_PROTO_HDLC:	return hdlc_raw_ioctl(dev, ifr);
-	case IF_PROTO_HDLC_ETH:	return hdlc_raw_eth_ioctl(dev, ifr);
-	case IF_PROTO_PPP:	return hdlc_ppp_ioctl(dev, ifr);
-	case IF_PROTO_CISCO:	return hdlc_cisco_ioctl(dev, ifr);
-	case IF_PROTO_FR:	return hdlc_fr_ioctl(dev, ifr);
-	case IF_PROTO_X25:	return hdlc_x25_ioctl(dev, ifr);
-	default:		return -EINVAL;
-	}
-}
-
-void hdlc_setup(struct net_device *dev)
-{
-	hdlc_device *hdlc = dev_to_hdlc(dev);
-
-	dev->get_stats = hdlc_get_stats;
-	dev->change_mtu = hdlc_change_mtu;
-	dev->mtu = HDLC_MAX_MTU;
-
-	dev->type = ARPHRD_RAWHDLC;
-	dev->hard_header_len = 16;
-
-	dev->flags = IFF_POINTOPOINT | IFF_NOARP;
-
-	hdlc->proto.id = -1;
-	hdlc->proto.detach = NULL;
-	hdlc->carrier = 1;
-	hdlc->open = 0;
-	spin_lock_init(&hdlc->state_lock);
-}
-
-struct net_device *alloc_hdlcdev(void *priv)
-{
-	struct net_device *dev;
-	dev = alloc_netdev(sizeof(hdlc_device), "hdlc%d", hdlc_setup);
-	if (dev)
-		dev_to_hdlc(dev)->priv = priv;
-	return dev;
-}
-
-void unregister_hdlc_device(struct net_device *dev)
-{
-	rtnl_lock();
-	hdlc_proto_detach(dev_to_hdlc(dev));
-	unregister_netdevice(dev);
-	rtnl_unlock();
-}
-
-
-
-MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
-MODULE_DESCRIPTION("HDLC support module");
-MODULE_LICENSE("GPL v2");
-
-EXPORT_SYMBOL(hdlc_open);
-EXPORT_SYMBOL(hdlc_close);
-EXPORT_SYMBOL(hdlc_ioctl);
-EXPORT_SYMBOL(hdlc_setup);
-EXPORT_SYMBOL(alloc_hdlcdev);
-EXPORT_SYMBOL(unregister_hdlc_device);
-
-static struct packet_type hdlc_packet_type = {
-	.type = __constant_htons(ETH_P_HDLC),
-	.func = hdlc_rcv,
-};
-
-
-static struct notifier_block hdlc_notifier = {
-        .notifier_call = hdlc_device_event,
-};
-
-
-static int __init hdlc_module_init(void)
-{
-	int result;
-
-	printk(KERN_INFO "%s\n", version);
-	if ((result = register_netdevice_notifier(&hdlc_notifier)) != 0)
-                return result;
-        dev_add_pack(&hdlc_packet_type);
-	return 0;
-}
-
-
-
-static void __exit hdlc_module_exit(void)
-{
-	dev_remove_pack(&hdlc_packet_type);
-	unregister_netdevice_notifier(&hdlc_notifier);
-}
-
-
-module_init(hdlc_module_init);
-module_exit(hdlc_module_exit);