mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 03:06:50 +07:00
12a3bfefc8
Use pr_fmt, pr_<level> and netdev_<level> as appropriate. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
386 lines
8.1 KiB
C
386 lines
8.1 KiB
C
/*
|
|
* Generic HDLC support routines for Linux
|
|
*
|
|
* Copyright (C) 1999 - 2008 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.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/hdlc.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/inetdevice.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/pkt_sched.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <net/net_namespace.h>
|
|
|
|
|
|
static const char* version = "HDLC support module revision 1.22";
|
|
|
|
#undef DEBUG_LINK
|
|
|
|
static struct hdlc_proto *first_proto;
|
|
|
|
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 int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *p, struct net_device *orig_dev)
|
|
{
|
|
struct hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
|
|
if (!net_eq(dev_net(dev), &init_net)) {
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
BUG_ON(!hdlc->proto->netif_rx);
|
|
return hdlc->proto->netif_rx(skb);
|
|
}
|
|
|
|
netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
|
|
if (hdlc->proto->xmit)
|
|
return hdlc->proto->xmit(skb, dev);
|
|
|
|
return hdlc->xmit(skb, dev); /* call hardware driver directly */
|
|
}
|
|
|
|
static inline void hdlc_proto_start(struct net_device *dev)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
if (hdlc->proto->start)
|
|
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)
|
|
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 (!net_eq(dev_net(dev), &init_net))
|
|
return NOTIFY_DONE;
|
|
|
|
if (!(dev->priv_flags & IFF_WAN_HDLC))
|
|
return NOTIFY_DONE; /* not an HDLC device */
|
|
|
|
if (event != NETDEV_CHANGE)
|
|
return NOTIFY_DONE; /* Only interested 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) {
|
|
netdev_info(dev, "Carrier detected\n");
|
|
hdlc_proto_start(dev);
|
|
} else {
|
|
netdev_info(dev, "Carrier lost\n");
|
|
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 "%s: hdlc_open() carrier %i open %i\n", dev->name,
|
|
hdlc->carrier, hdlc->open);
|
|
#endif
|
|
|
|
if (hdlc->proto == NULL)
|
|
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) {
|
|
netdev_info(dev, "Carrier detected\n");
|
|
hdlc_proto_start(dev);
|
|
} else
|
|
netdev_info(dev, "No carrier\n");
|
|
|
|
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 "%s: hdlc_close() carrier %i open %i\n", dev->name,
|
|
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);
|
|
}
|
|
|
|
|
|
|
|
int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
|
|
{
|
|
struct hdlc_proto *proto = first_proto;
|
|
int result;
|
|
|
|
if (cmd != SIOCWANDEV)
|
|
return -EINVAL;
|
|
|
|
if (dev_to_hdlc(dev)->proto) {
|
|
result = dev_to_hdlc(dev)->proto->ioctl(dev, ifr);
|
|
if (result != -EINVAL)
|
|
return result;
|
|
}
|
|
|
|
/* Not handled by currently attached protocol (if any) */
|
|
|
|
while (proto) {
|
|
if ((result = proto->ioctl(dev, ifr)) != -EINVAL)
|
|
return result;
|
|
proto = proto->next;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct header_ops hdlc_null_ops;
|
|
|
|
static void hdlc_setup_dev(struct net_device *dev)
|
|
{
|
|
/* Re-init all variables changed by HDLC protocol drivers,
|
|
* including ether_setup() called from hdlc_raw_eth.c.
|
|
*/
|
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
|
|
dev->priv_flags = IFF_WAN_HDLC;
|
|
dev->mtu = HDLC_MAX_MTU;
|
|
dev->type = ARPHRD_RAWHDLC;
|
|
dev->hard_header_len = 16;
|
|
dev->addr_len = 0;
|
|
dev->header_ops = &hdlc_null_ops;
|
|
}
|
|
|
|
static void hdlc_setup(struct net_device *dev)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
|
|
hdlc_setup_dev(dev);
|
|
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(struct 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();
|
|
unregister_netdevice(dev);
|
|
detach_hdlc_protocol(dev);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
|
|
|
|
int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto,
|
|
size_t size)
|
|
{
|
|
detach_hdlc_protocol(dev);
|
|
|
|
if (!try_module_get(proto->module))
|
|
return -ENOSYS;
|
|
|
|
if (size)
|
|
if ((dev_to_hdlc(dev)->state = kmalloc(size,
|
|
GFP_KERNEL)) == NULL) {
|
|
netdev_warn(dev,
|
|
"Memory squeeze on hdlc_proto_attach()\n");
|
|
module_put(proto->module);
|
|
return -ENOBUFS;
|
|
}
|
|
dev_to_hdlc(dev)->proto = proto;
|
|
return 0;
|
|
}
|
|
|
|
|
|
void detach_hdlc_protocol(struct net_device *dev)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
|
|
if (hdlc->proto) {
|
|
if (hdlc->proto->detach)
|
|
hdlc->proto->detach(dev);
|
|
module_put(hdlc->proto->module);
|
|
hdlc->proto = NULL;
|
|
}
|
|
kfree(hdlc->state);
|
|
hdlc->state = NULL;
|
|
hdlc_setup_dev(dev);
|
|
}
|
|
|
|
|
|
void register_hdlc_protocol(struct hdlc_proto *proto)
|
|
{
|
|
rtnl_lock();
|
|
proto->next = first_proto;
|
|
first_proto = proto;
|
|
rtnl_unlock();
|
|
}
|
|
|
|
|
|
void unregister_hdlc_protocol(struct hdlc_proto *proto)
|
|
{
|
|
struct hdlc_proto **p;
|
|
|
|
rtnl_lock();
|
|
p = &first_proto;
|
|
while (*p != proto) {
|
|
BUG_ON(!*p);
|
|
p = &((*p)->next);
|
|
}
|
|
*p = proto->next;
|
|
rtnl_unlock();
|
|
}
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
|
|
MODULE_DESCRIPTION("HDLC support module");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
EXPORT_SYMBOL(hdlc_change_mtu);
|
|
EXPORT_SYMBOL(hdlc_start_xmit);
|
|
EXPORT_SYMBOL(hdlc_open);
|
|
EXPORT_SYMBOL(hdlc_close);
|
|
EXPORT_SYMBOL(hdlc_ioctl);
|
|
EXPORT_SYMBOL(alloc_hdlcdev);
|
|
EXPORT_SYMBOL(unregister_hdlc_device);
|
|
EXPORT_SYMBOL(register_hdlc_protocol);
|
|
EXPORT_SYMBOL(unregister_hdlc_protocol);
|
|
EXPORT_SYMBOL(attach_hdlc_protocol);
|
|
EXPORT_SYMBOL(detach_hdlc_protocol);
|
|
|
|
static struct packet_type hdlc_packet_type __read_mostly = {
|
|
.type = cpu_to_be16(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;
|
|
|
|
pr_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);
|