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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
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49
drivers/net/wan/hdlc_raw_eth.c
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@@ -2,7 +2,7 @@
* Generic HDLC support routines for Linux
* HDLC Ethernet emulation support
*
* Copyright (C) 2002-2003 Krzysztof Halasa <khc@pm.waw.pl>
* Copyright (C) 2002-2006 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
@@ -25,6 +25,7 @@
#include <linux/etherdevice.h>
#include <linux/hdlc.h>
static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr);
static int eth_tx(struct sk_buff *skb, struct net_device *dev)
{
@@ -44,7 +45,14 @@ static int eth_tx(struct sk_buff *skb, struct net_device *dev)
}
int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
static struct hdlc_proto proto = {
.type_trans = eth_type_trans,
.ioctl = raw_eth_ioctl,
.module = THIS_MODULE,
};
static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
{
raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
const size_t size = sizeof(raw_hdlc_proto);
@@ -56,12 +64,14 @@ int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
switch (ifr->ifr_settings.type) {
case IF_GET_PROTO:
if (dev_to_hdlc(dev)->proto != &proto)
return -EINVAL;
ifr->ifr_settings.type = IF_PROTO_HDLC_ETH;
if (ifr->ifr_settings.size < size) {
ifr->ifr_settings.size = size; /* data size wanted */
return -ENOBUFS;
}
if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size))
if (copy_to_user(raw_s, hdlc->state, size))
return -EFAULT;
return 0;
@@ -86,12 +96,11 @@ int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
if (result)
return result;
hdlc_proto_detach(hdlc);
memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size);
memset(&hdlc->proto, 0, sizeof(hdlc->proto));
hdlc->proto.type_trans = eth_type_trans;
hdlc->proto.id = IF_PROTO_HDLC_ETH;
result = attach_hdlc_protocol(dev, &proto, NULL,
sizeof(raw_hdlc_proto));
if (result)
return result;
memcpy(hdlc->state, &new_settings, size);
dev->hard_start_xmit = eth_tx;
old_ch_mtu = dev->change_mtu;
old_qlen = dev->tx_queue_len;
@@ -106,3 +115,25 @@ int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
return -EINVAL;
}
static int __init mod_init(void)
{
register_hdlc_protocol(&proto);
return 0;
}
static void __exit mod_exit(void)
{
unregister_hdlc_protocol(&proto);
}
module_init(mod_init);
module_exit(mod_exit);
MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
MODULE_LICENSE("GPL v2");