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/*
* Simulated Ethernet Driver
*
* Copyright (C) 1999-2001, 2003 Hewlett-Packard Co
* Stephane Eranian <eranian@hpl.hp.com>
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/inetdevice.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/notifier.h>
#include <linux/bitops.h>
#include <asm/irq.h>
#include <asm/hpsim.h>
#include "hpsim_ssc.h"
#define SIMETH_RECV_MAX 10
/*
* Maximum possible received frame for Ethernet.
* We preallocate an sk_buff of that size to avoid costly
* memcpy for temporary buffer into sk_buff. We do basically
* what's done in other drivers, like eepro with a ring.
* The difference is, of course, that we don't have real DMA !!!
*/
#define SIMETH_FRAME_SIZE ETH_FRAME_LEN
#define NETWORK_INTR 8
struct simeth_local {
struct net_device_stats stats;
int simfd; /* descriptor in the simulator */
};
static int simeth_probe1(void);
static int simeth_open(struct net_device *dev);
static int simeth_close(struct net_device *dev);
static int simeth_tx(struct sk_buff *skb, struct net_device *dev);
static int simeth_rx(struct net_device *dev);
static struct net_device_stats *simeth_get_stats(struct net_device *dev);
static irqreturn_t simeth_interrupt(int irq, void *dev_id);
static void set_multicast_list(struct net_device *dev);
static int simeth_device_event(struct notifier_block *this,unsigned long event, void *ptr);
static char *simeth_version="0.3";
/*
* This variable is used to establish a mapping between the Linux/ia64 kernel
* and the host linux kernel.
*
* As of today, we support only one card, even though most of the code
* is ready for many more. The mapping is then:
* linux/ia64 -> linux/x86
* eth0 -> eth1
*
* In the future, we some string operations, we could easily support up
* to 10 cards (0-9).
*
* The default mapping can be changed on the kernel command line by
* specifying simeth=ethX (or whatever string you want).
*/
static char *simeth_device="eth0"; /* default host interface to use */
static volatile unsigned int card_count; /* how many cards "found" so far */
static int simeth_debug; /* set to 1 to get debug information */
/*
* Used to catch IFF_UP & IFF_DOWN events
*/
static struct notifier_block simeth_dev_notifier = {
simeth_device_event,
NULL
};
/*
* Function used when using a kernel command line option.
*
* Format: simeth=interface_name (like eth0)
*/
static int __init
simeth_setup(char *str)
{
simeth_device = str;
return 1;
}
__setup("simeth=", simeth_setup);
/*
* Function used to probe for simeth devices when not installed
* as a loadable module
*/
int __init
simeth_probe (void)
{
int r;
printk(KERN_INFO "simeth: v%s\n", simeth_version);
r = simeth_probe1();
if (r == 0) register_netdevice_notifier(&simeth_dev_notifier);
return r;
}
static inline int
netdev_probe(char *name, unsigned char *ether)
{
return ia64_ssc(__pa(name), __pa(ether), 0,0, SSC_NETDEV_PROBE);
}
static inline int
netdev_attach(int fd, int irq, unsigned int ipaddr)
{
/* this puts the host interface in the right mode (start interrupting) */
return ia64_ssc(fd, ipaddr, 0,0, SSC_NETDEV_ATTACH);
}
static inline int
netdev_detach(int fd)
{
/*
* inactivate the host interface (don't interrupt anymore) */
return ia64_ssc(fd, 0,0,0, SSC_NETDEV_DETACH);
}
static inline int
netdev_send(int fd, unsigned char *buf, unsigned int len)
{
return ia64_ssc(fd, __pa(buf), len, 0, SSC_NETDEV_SEND);
}
static inline int
netdev_read(int fd, unsigned char *buf, unsigned int len)
{
return ia64_ssc(fd, __pa(buf), len, 0, SSC_NETDEV_RECV);
}
static const struct net_device_ops simeth_netdev_ops = {
.ndo_open = simeth_open,
.ndo_stop = simeth_close,
.ndo_start_xmit = simeth_tx,
.ndo_get_stats = simeth_get_stats,
.ndo_set_rx_mode = set_multicast_list, /* not yet used */
};
/*
* Function shared with module code, so cannot be in init section
*
* So far this function "detects" only one card (test_&_set) but could
* be extended easily.
*
* Return:
* - -ENODEV is no device found
* - -ENOMEM is no more memory
* - 0 otherwise
*/
static int
simeth_probe1(void)
{
unsigned char mac_addr[ETH_ALEN];
struct simeth_local *local;
struct net_device *dev;
int fd, err, rc;
/*
* XXX Fix me
* let's support just one card for now
*/
if (test_and_set_bit(0, &card_count))
return -ENODEV;
/*
* check with the simulator for the device
*/
fd = netdev_probe(simeth_device, mac_addr);
if (fd == -1)
return -ENODEV;
dev = alloc_etherdev(sizeof(struct simeth_local));
if (!dev)
return -ENOMEM;
memcpy(dev->dev_addr, mac_addr, sizeof(mac_addr));
local = netdev_priv(dev);
local->simfd = fd; /* keep track of underlying file descriptor */
dev->netdev_ops = &simeth_netdev_ops;
err = register_netdev(dev);
if (err) {
free_netdev(dev);
return err;
}
/*
* attach the interrupt in the simulator, this does enable interrupts
* until a netdev_attach() is called
*/
if ((rc = hpsim_get_irq(NETWORK_INTR)) < 0)
panic("%s: out of interrupt vectors!\n", __func__);
dev->irq = rc;
printk(KERN_INFO "%s: hosteth=%s simfd=%d, HwAddr=%pm, IRQ %d\n",
dev->name, simeth_device, local->simfd, dev->dev_addr, dev->irq);
return 0;
}
/*
* actually binds the device to an interrupt vector
*/
static int
simeth_open(struct net_device *dev)
{
if (request_irq(dev->irq, simeth_interrupt, 0, "simeth", dev)) {
printk(KERN_WARNING "simeth: unable to get IRQ %d.\n", dev->irq);
return -EAGAIN;
}
netif_start_queue(dev);
return 0;
}
/* copied from lapbether.c */
static __inline__ int dev_is_ethdev(struct net_device *dev)
{
return ( dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5));
}
/*
* Handler for IFF_UP or IFF_DOWN
*
* The reason for that is that we don't want to be interrupted when the
* interface is down. There is no way to unconnect in the simualtor. Instead
* we use this function to shutdown packet processing in the frame filter
* in the simulator. Thus no interrupts are generated
*
*
* That's also the place where we pass the IP address of this device to the
* simulator so that that we can start filtering packets for it
*
* There may be a better way of doing this, but I don't know which yet.
*/
static int
simeth_device_event(struct notifier_block *this,unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
struct simeth_local *local;
struct in_device *in_dev;
struct in_ifaddr **ifap = NULL;
struct in_ifaddr *ifa = NULL;
int r;
if ( ! dev ) {
printk(KERN_WARNING "simeth_device_event dev=0\n");
return NOTIFY_DONE;
}
if (dev_net(dev) != &init_net)
return NOTIFY_DONE;
if ( event != NETDEV_UP && event != NETDEV_DOWN ) return NOTIFY_DONE;
/*
* Check whether or not it's for an ethernet device
*
* XXX Fixme: This works only as long as we support one
* type of ethernet device.
*/
if ( !dev_is_ethdev(dev) ) return NOTIFY_DONE;
if ((in_dev=dev->ip_ptr) != NULL) {
for (ifap=&in_dev->ifa_list; (ifa=*ifap) != NULL; ifap=&ifa->ifa_next)
if (strcmp(dev->name, ifa->ifa_label) == 0) break;
}
if ( ifa == NULL ) {
printk(KERN_ERR "simeth_open: can't find devi
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