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/*
* originally based on the dummy device.
*
* Copyright 1999, Thomas Davis, tadavis@lbl.gov.
* Licensed under the GPL. Based on dummy.c, and eql.c devices.
*
* bond.c: a bonding/etherchannel/sun trunking net driver
*
* This is useful to talk to a Cisco 5500, running Etherchannel, aka:
* Linux Channel Bonding
* Sun Trunking (Solaris)
*
* How it works:
* ifconfig bond0 ipaddress netmask up
* will setup a network device, with an ip address. No mac address
* will be assigned at this time. The hw mac address will come from
* the first slave bonded to the channel. All slaves will then use
* this hw mac address.
*
* ifconfig bond0 down
* will release all slaves, marking them as down.
*
* ifenslave bond0 eth0
* will attache eth0 to bond0 as a slave. eth0 hw mac address will either
* a: be used as initial mac address
* b: if a hw mac address already is there, eth0's hw mac address
* will then be set from bond0.
*
* v0.1 - first working version.
* v0.2 - changed stats to be calculated by summing slaves stats.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/if_bonding.h>
typedef struct slave
{
struct slave *next;
struct slave *prev;
struct net_device *dev;
} slave_t;
typedef struct bonding
{
slave_t *next;
slave_t *prev;
struct net_device *master;
slave_t *current_slave;
struct net_device_stats stats;
} bonding_t;
static int bond_xmit(struct sk_buff *skb, struct net_device *dev);
static struct net_device_stats *bond_get_stats(struct net_device *dev);
static struct net_device *this_bond;
static void release_one_slave(struct net_device *master, slave_t *slave)
{
bonding_t *bond = master->priv;
spin_lock_bh(&master->xmit_lock);
if (bond->current_slave == slave)
bond->current_slave = slave->next;
slave->next->prev = slave->prev;
slave->prev->next = slave->next;
spin_unlock_bh(&master->xmit_lock);
netdev_set_master(slave->dev, NULL);
dev_put(slave->dev);
kfree(slave);
}
static int bond_close(struct net_device *master)
{
bonding_t *bond = master->priv;
slave_t *slave;
while ((slave = bond->next) != (slave_t*)bond)
release_one_slave(master, slave);
return 0;
}
static void bond_set_multicast_list(struct net_device *master)
{
}
static int bond_enslave(struct net_device *master, struct net_device *dev)
{
int err;
bonding_t *bond = master->priv;
slave_t *slave;
if (dev->type != master->type)
return -ENODEV;
if ((slave = kmalloc(sizeof(slave_t), GFP_KERNEL)) == NULL)
return -ENOMEM;
memset(slave, 0, sizeof(slave_t));
err = netdev_set_master(dev, master);
if (err) {
kfree(slave);
return err;
}
slave->dev = dev;
spin_lock_bh(&master->xmit_lock);
dev_hold(dev);
slave->prev = bond->prev;
slave->next = (slave_t*)bond;
slave->prev->next = slave;
slave->next->prev = slave;
spin_unlock_bh(&master->xmit_lock);
return 0;
}
static int bond_release(struct net_device *master, struct net_device *dev)
{
bonding_t *bond = master->priv;
slave_t *slave;
if (dev->master != master)
return -EINVAL;
for (slave = bond->next; slave != (slave_t*)bond; slave = slave->next) {
if (slave->dev == dev) {
release_one_slave(master, slave);
break;
}
}
return 0;
}
/* It is pretty silly, SIOCSIFHWADDR exists to make this. */
static int bond_sethwaddr(struct net_device *master, struct net_device *slave)
{
memcpy(master->dev_addr, slave->dev_addr, slave->addr_len);
return 0;
}
static int bond_ioctl(struct net_device *master, struct ifreq *ifr, int cmd)
{
struct net_device *slave = __dev_get_by_name(ifr->ifr_slave);
if (slave == NULL)
return -ENODEV;
switch (cmd) {
case BOND_ENSLAVE:
return bond_enslave(master, slave);
case BOND_RELEASE:
return bond_release(master, slave);
case BOND_SETHWADDR:
return bond_sethwaddr(master, slave);
default:
return -EOPNOTSUPP;
}
}
static int bond_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct net_device *slave = ptr;
if (this_bond == NULL ||
this_bond == slave ||
this_bond != slave->master)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UNREGISTER:
bond_release(this_bond, slave);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block bond_netdev_notifier={
notifier_call: bond_event
};
static int __init bond_init(struct net_device *dev)
{
bonding_t *bond;
bond = kmalloc(sizeof(struct bonding), GFP_KERNEL);
if (bond == NULL)
return -ENOMEM;
memset(bond, 0, sizeof(struct bonding));
bond->next = (slave_t*)bond;
bond->prev = (slave_t*)bond;
bond->master = dev;
bond->current_slave = (slave_t*)bond;
dev->priv = bond;
/* Initialize the device structure. */
dev->hard_start_xmit = bond_xmit;
dev->get_stats = bond_get_stats;
dev->stop = bond_close;
dev->set_multicast_list = bond_set_multicast_list;
dev->do_ioctl = bond_ioctl;
/* Fill in the fields of the device structure with ethernet-generic
values. */
ether_setup(dev);
dev->tx_queue_len = 0;
dev->flags |= IFF_MASTER;
this_bond = dev;
register_netdevice_notifier(&bond_netdev_notifier);
return 0;
}
static int bond_xmit(struct sk_buff *skb, struct net_device *dev)
{
bonding_t *bond = dev->priv;
slave_t *slave, *start_at;
int pkt_len = skb->len;
slave = start_at = bond->current_slave;
do {
if (slave == (slave_t*)bond)
continue;
if (netif_running(slave->dev) && netif_carrier_ok(slave->dev)) {
bond->current_slave = slave->next;
skb->dev = slave->dev;
if (dev_queue_xmit(skb)) {
bond->stats.tx_dropped++;
} else {
bond->stats.tx_packets++;
bond->stats.tx_bytes += pkt_len;
}
return 0;
}
} while ((slave = slave->next) != start_at);
bond->stats.tx_dropped++;
kfree_skb(skb);
return 0;
}
static struct net_device_stats *bond_get_stats(struct net_device *dev)
{
bonding_t *bond = dev->priv;
return &bond->stats;
}
static struct net_device dev_bond;
static int __init bonding_init(void)
{
/* Find a name for this unit */
int err;
dev_bond.init = bond_init;
err = dev_alloc_name(&dev_bond,"bond%d");
if (err<0)
return err;
SET_MODULE_OWNER(&dev_bond);
if (register_netdev(&dev_bond) != 0)
return -EIO;
return 0;
}
static void __exit bonding_exit(void)
{
unregister_netdevice_notifier(&bond_netdev_notifier);
unregister_netdev(&dev_bond);
kfree(dev_bond.priv);
}
module_init(bonding_init);
module_exit(bonding_exit);
MODULE_LICENSE("GPL");
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* tab-width: 8
* End:
*/
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