Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 613 insertions, 0 deletions

diff --git a/drivers/net/eql.c b/drivers/net/eql.c
new file mode 100644
index 000000000000..dd6865820372
--- /dev/null
+++ b/drivers/net/eql.c
@@ -0,0 +1,613 @@
+/*
+ * Equalizer Load-balancer for serial network interfaces.
+ *
+ * (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
+ * NCM: Network and Communications Management, Inc.
+ *
+ * (c) Copyright 2002 David S. Miller (davem@redhat.com)
+ *
+ *      This software may be used and distributed according to the terms
+ *      of the GNU General Public License, incorporated herein by reference.
+ * 
+ * The author may be reached as simon@ncm.com, or C/O
+ *    NCM
+ *    Attn: Simon Janes
+ *    6803 Whittier Ave
+ *    McLean VA 22101
+ *    Phone: 1-703-847-0040 ext 103
+ */
+
+/*
+ * Sources:
+ *   skeleton.c by Donald Becker.
+ * Inspirations:
+ *   The Harried and Overworked Alan Cox
+ * Conspiracies:
+ *   The Alan Cox and Mike McLagan plot to get someone else to do the code, 
+ *   which turned out to be me.
+ */
+
+/*
+ * $Log: eql.c,v $
+ * Revision 1.2  1996/04/11 17:51:52  guru
+ * Added one-line eql_remove_slave patch.
+ *
+ * Revision 1.1  1996/04/11 17:44:17  guru
+ * Initial revision
+ *
+ * Revision 3.13  1996/01/21  15:17:18  alan
+ * tx_queue_len changes.
+ * reformatted.
+ *
+ * Revision 3.12  1995/03/22  21:07:51  anarchy
+ * Added capable() checks on configuration.
+ * Moved header file.
+ *
+ * Revision 3.11  1995/01/19  23:14:31  guru
+ *                    slave_load = (ULONG_MAX - (ULONG_MAX / 2)) -
+ *                      (priority_Bps) + bytes_queued * 8;
+ *
+ * Revision 3.10  1995/01/19  23:07:53  guru
+ * back to
+ *                    slave_load = (ULONG_MAX - (ULONG_MAX / 2)) -
+ *                      (priority_Bps) + bytes_queued;
+ *
+ * Revision 3.9  1995/01/19  22:38:20  guru
+ *                    slave_load = (ULONG_MAX - (ULONG_MAX / 2)) -
+ *                      (priority_Bps) + bytes_queued * 4;
+ *
+ * Revision 3.8  1995/01/19  22:30:55  guru
+ *       slave_load = (ULONG_MAX - (ULONG_MAX / 2)) -
+ *                      (priority_Bps) + bytes_queued * 2;
+ *
+ * Revision 3.7  1995/01/19  21:52:35  guru
+ * printk's trimmed out.
+ *
+ * Revision 3.6  1995/01/19  21:49:56  guru
+ * This is working pretty well. I gained 1 K/s in speed.. now it's just
+ * robustness and printk's to be diked out.
+ *
+ * Revision 3.5  1995/01/18  22:29:59  guru
+ * still crashes the kernel when the lock_wait thing is woken up.
+ *
+ * Revision 3.4  1995/01/18  21:59:47  guru
+ * Broken set-bit locking snapshot
+ *
+ * Revision 3.3  1995/01/17  22:09:18  guru
+ * infinite sleep in a lock somewhere..
+ *
+ * Revision 3.2  1995/01/15  16:46:06  guru
+ * Log trimmed of non-pertinent 1.x branch messages
+ *
+ * Revision 3.1  1995/01/15  14:41:45  guru
+ * New Scheduler and timer stuff...
+ *
+ * Revision 1.15  1995/01/15  14:29:02  guru
+ * Will make 1.14 (now 1.15) the 3.0 branch, and the 1.12 the 2.0 branch, the one
+ * with the dumber scheduler
+ *
+ * Revision 1.14  1995/01/15  02:37:08  guru
+ * shock.. the kept-new-versions could have zonked working
+ * stuff.. shudder
+ *
+ * Revision 1.13  1995/01/15  02:36:31  guru
+ * big changes
+ *
+ *      scheduler was torn out and replaced with something smarter
+ *
+ *      global names not prefixed with eql_ were renamed to protect
+ *      against namespace collisions
+ *
+ *      a few more abstract interfaces were added to facilitate any
+ *      potential change of datastructure.  the driver is still using
+ *      a linked list of slaves.  going to a heap would be a bit of
+ *      an overkill.
+ *
+ *      this compiles fine with no warnings.
+ *
+ *      the locking mechanism and timer stuff must be written however,
+ *      this version will not work otherwise
+ *
+ * Sorry, I had to rewrite most of this for 2.5.x -DaveM
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/netdevice.h>
+
+#include <linux/if.h>
+#include <linux/if_arp.h>
+#include <linux/if_eql.h>
+
+#include <asm/uaccess.h>
+
+static int eql_open(struct net_device *dev);
+static int eql_close(struct net_device *dev);
+static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
+static int eql_slave_xmit(struct sk_buff *skb, struct net_device *dev);
+static struct net_device_stats *eql_get_stats(struct net_device *dev);
+
+#define eql_is_slave(dev)       ((dev->flags & IFF_SLAVE) == IFF_SLAVE)
+#define eql_is_master(dev)      ((dev->flags & IFF_MASTER) == IFF_MASTER)
+
+static void eql_kill_one_slave(slave_t *slave);
+
+static void eql_timer(unsigned long param)
+{
+        equalizer_t *eql = (equalizer_t *) param;
+        struct list_head *this, *tmp, *head;
+        
+        spin_lock_bh(&eql->queue.lock);
+        head = &eql->queue.all_slaves;
+        list_for_each_safe(this, tmp, head) {
+                slave_t *slave = list_entry(this, slave_t, list);
+
+                if ((slave->dev->flags & IFF_UP) == IFF_UP) {
+                        slave->bytes_queued -= slave->priority_Bps;
+                        if (slave->bytes_queued < 0)
+                                slave->bytes_queued = 0;
+                } else {
+                        eql_kill_one_slave(slave);
+                }
+
+        }
+        spin_unlock_bh(&eql->queue.lock);
+
+        eql->timer.expires = jiffies + EQL_DEFAULT_RESCHED_IVAL;
+        add_timer(&eql->timer);
+}
+
+static char version[] __initdata = 
+        "Equalizer2002: Simon Janes (simon@ncm.com) and David S. Miller (davem@redhat.com)\n";
+
+static void __init eql_setup(struct net_device *dev)
+{
+        equalizer_t *eql = netdev_priv(dev);
+
+        SET_MODULE_OWNER(dev);
+
+        init_timer(&eql->timer);
+        eql->timer.data         = (unsigned long) eql;
+        eql->timer.expires      = jiffies + EQL_DEFAULT_RESCHED_IVAL;
+        eql->timer.function     = eql_timer;
+
+        spin_lock_init(&eql->queue.lock);
+        INIT_LIST_HEAD(&eql->queue.all_slaves);
+        eql->queue.master_dev   = dev;
+
+        dev->open               = eql_open;
+        dev->stop               = eql_close;
+        dev->do_ioctl           = eql_ioctl;
+        dev->hard_start_xmit    = eql_slave_xmit;
+        dev->get_stats          = eql_get_stats;
+  
+        /*
+         *      Now we undo some of the things that eth_setup does
+         *      that we don't like 
+         */
+         
+        dev->mtu                = EQL_DEFAULT_MTU;      /* set to 576 in if_eql.h */
+        dev->flags              = IFF_MASTER;
+
+        dev->type               = ARPHRD_SLIP;
+        dev->tx_queue_len       = 5;            /* Hands them off fast */
+}
+
+static int eql_open(struct net_device *dev)
+{
+        equalizer_t *eql = netdev_priv(dev);
+
+        /* XXX We should force this off automatically for the user. */
+        printk(KERN_INFO "%s: remember to turn off Van-Jacobson compression on "
+               "your slave devices.\n", dev->name);
+
+        if (!list_empty(&eql->queue.all_slaves))
+                BUG();
+
+        eql->min_slaves = 1;
+        eql->max_slaves = EQL_DEFAULT_MAX_SLAVES; /* 4 usually... */
+
+        add_timer(&eql->timer);
+
+        return 0;
+}
+
+static void eql_kill_one_slave(slave_t *slave)
+{
+        list_del(&slave->list);
+        slave->dev->flags &= ~IFF_SLAVE;
+        dev_put(slave->dev);
+        kfree(slave);
+}
+
+static void eql_kill_slave_queue(slave_queue_t *queue)
+{ 
+        struct list_head *head, *tmp, *this;
+
+        spin_lock_bh(&queue->lock);
+
+        head = &queue->all_slaves;
+        list_for_each_safe(this, tmp, head) {
+                slave_t *s = list_entry(this, slave_t, list);
+
+                eql_kill_one_slave(s);
+                queue->num_slaves--;
+        }
+
+        spin_unlock_bh(&queue->lock);
+}
+
+static int eql_close(struct net_device *dev)
+{
+        equalizer_t *eql = netdev_priv(dev);
+
+        /*
+         *      The timer has to be stopped first before we start hacking away
+         *      at the data structure it scans every so often... 
+         */
+
+        del_timer_sync(&eql->timer);
+
+        eql_kill_slave_queue(&eql->queue);
+
+        return 0;
+}
+
+static int eql_enslave(struct net_device *dev,  slaving_request_t __user *srq);
+static int eql_emancipate(struct net_device *dev, slaving_request_t __user *srq);
+
+static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
+static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
+
+static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mc);
+static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mc);
+
+static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{  
+        if (cmd != EQL_GETMASTRCFG && cmd != EQL_GETSLAVECFG &&
+            !capable(CAP_NET_ADMIN))
+                return -EPERM;
+
+        switch (cmd) {
+                case EQL_ENSLAVE:
+                        return eql_enslave(dev, ifr->ifr_data);
+                case EQL_EMANCIPATE:
+                        return eql_emancipate(dev, ifr->ifr_data);
+                case EQL_GETSLAVECFG:
+                        return eql_g_slave_cfg(dev, ifr->ifr_data);
+                case EQL_SETSLAVECFG:
+                        return eql_s_slave_cfg(dev, ifr->ifr_data);
+                case EQL_GETMASTRCFG:
+                        return eql_g_master_cfg(dev, ifr->ifr_data);
+                case EQL_SETMASTRCFG:
+                        return eql_s_master_cfg(dev, ifr->ifr_data);
+                default:
+                        return -EOPNOTSUPP;
+        };
+}
+
+/* queue->lock must be held */
+static slave_t *__eql_schedule_slaves(slave_queue_t *queue)
+{
+        unsigned long best_load = ~0UL;
+        struct list_head *this, *tmp, *head;
+        slave_t *best_slave;
+
+        best_slave = NULL;
+
+        /* Make a pass to set the best slave. */
+        head = &queue->all_slaves;
+        list_for_each_safe(this, tmp, head) {
+                slave_t *slave = list_entry(this, slave_t, list);
+                unsigned long slave_load, bytes_queued, priority_Bps; 
+
+                /* Go through the slave list once, updating best_slave
+                 * whenever a new best_load is found.
+                 */
+                bytes_queued = slave->bytes_queued;
+                priority_Bps = slave->priority_Bps;    
+                if ((slave->dev->flags & IFF_UP) == IFF_UP) {
+                        slave_load = (~0UL - (~0UL / 2)) - 
+                                (priority_Bps) + bytes_queued * 8;
+
+                        if (slave_load < best_load) {
+                                best_load = slave_load;
+                                best_slave = slave;
+                        }
+                } else {
+                        /* We found a dead slave, kill it. */
+                        eql_kill_one_slave(slave);
+                }
+        }
+        return best_slave;
+}
+
+static int eql_slave_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        equalizer_t *eql = netdev_priv(dev);
+        slave_t *slave;
+
+        spin_lock(&eql->queue.lock);
+
+        slave = __eql_schedule_slaves(&eql->queue);
+        if (slave) {
+                struct net_device *slave_dev = slave->dev;
+
+                skb->dev = slave_dev;
+                skb->priority = 1;
+                slave->bytes_queued += skb->len; 
+                dev_queue_xmit(skb);
+                eql->stats.tx_packets++;
+        } else {
+                eql->stats.tx_dropped++;
+                dev_kfree_skb(skb);
+        }         
+
+        spin_unlock(&eql->queue.lock);
+
+        return 0;
+}
+
+static struct net_device_stats * eql_get_stats(struct net_device *dev)
+{
+        equalizer_t *eql = netdev_priv(dev);
+        return &eql->stats;
+}
+
+/*
+ *      Private ioctl functions
+ */
+
+/* queue->lock must be held */
+static slave_t *__eql_find_slave_dev(slave_queue_t *queue, struct net_device *dev)
+{
+        struct list_head *this, *head;
+
+        head = &queue->all_slaves;
+        list_for_each(this, head) {
+                slave_t *slave = list_entry(this, slave_t, list);
+
+                if (slave->dev == dev)
+                        return slave;
+        }
+
+        return NULL;
+}
+
+static inline int eql_is_full(slave_queue_t *queue)
+{
+        equalizer_t *eql = netdev_priv(queue->master_dev);
+
+        if (queue->num_slaves >= eql->max_slaves)
+                return 1;
+        return 0;
+}
+
+/* queue->lock must be held */
+static int __eql_insert_slave(slave_queue_t *queue, slave_t *slave)
+{
+        if (!eql_is_full(queue)) {
+                slave_t *duplicate_slave = NULL;
+
+                duplicate_slave = __eql_find_slave_dev(queue, slave->dev);
+                if (duplicate_slave != 0)
+                        eql_kill_one_slave(duplicate_slave);
+
+                list_add(&slave->list, &queue->all_slaves);
+                queue->num_slaves++;
+                slave->dev->flags |= IFF_SLAVE;
+
+                return 0;
+        }
+
+        return -ENOSPC;
+}
+
+static int eql_enslave(struct net_device *master_dev, slaving_request_t __user *srqp)
+{
+        struct net_device *slave_dev;
+        slaving_request_t srq;
+
+        if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
+                return -EFAULT;
+
+        slave_dev  = dev_get_by_name(srq.slave_name);
+        if (slave_dev) {
+                if ((master_dev->flags & IFF_UP) == IFF_UP) {
+                        /* slave is not a master & not already a slave: */
+                        if (!eql_is_master(slave_dev) &&
+                            !eql_is_slave(slave_dev)) {
+                                slave_t *s = kmalloc(sizeof(*s), GFP_KERNEL);
+                                equalizer_t *eql = netdev_priv(master_dev);
+                                int ret;
+
+                                if (!s) {
+                                        dev_put(slave_dev);
+                                        return -ENOMEM;
+                                }
+
+                                memset(s, 0, sizeof(*s));
+                                s->dev = slave_dev;
+                                s->priority = srq.priority;
+                                s->priority_bps = srq.priority;
+                                s->priority_Bps = srq.priority / 8;
+
+                                spin_lock_bh(&eql->queue.lock);
+                                ret = __eql_insert_slave(&eql->queue, s);
+                                if (ret) {
+                                        dev_put(slave_dev);
+                                        kfree(s);
+                                }
+                                spin_unlock_bh(&eql->queue.lock);
+
+                                return ret;
+                        }
+                }
+                dev_put(slave_dev);
+        }
+
+        return -EINVAL;
+}
+
+static int eql_emancipate(struct net_device *master_dev, slaving_request_t __user *srqp)
+{
+        equalizer_t *eql = netdev_priv(master_dev);
+        struct net_device *slave_dev;
+        slaving_request_t srq;
+        int ret;
+
+        if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
+                return -EFAULT;
+
+        slave_dev = dev_get_by_name(srq.slave_name);
+        ret = -EINVAL;
+        if (slave_dev) {
+                spin_lock_bh(&eql->queue.lock);
+
+                if (eql_is_slave(slave_dev)) {
+                        slave_t *slave = __eql_find_slave_dev(&eql->queue,
+                                                              slave_dev);
+
+                        if (slave) {
+                                eql_kill_one_slave(slave);
+                                ret = 0;
+                        }
+                }
+                dev_put(slave_dev);
+
+                spin_unlock_bh(&eql->queue.lock);
+        }
+
+        return ret;
+}
+
+static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
+{
+        equalizer_t *eql = netdev_priv(dev);
+        slave_t *slave;
+        struct net_device *slave_dev;
+        slave_config_t sc;
+        int ret;
+
+        if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
+                return -EFAULT;
+
+        slave_dev = dev_get_by_name(sc.slave_name);
+        if (!slave_dev)
+                return -ENODEV;
+
+        ret = -EINVAL;
+
+        spin_lock_bh(&eql->queue.lock);
+        if (eql_is_slave(slave_dev)) {
+                slave = __eql_find_slave_dev(&eql->queue, slave_dev);
+                if (slave) {
+                        sc.priority = slave->priority;
+                        ret = 0;
+                }
+        }
+        spin_unlock_bh(&eql->queue.lock);
+
+        dev_put(slave_dev);
+
+        if (!ret && copy_to_user(scp, &sc, sizeof (slave_config_t)))
+                ret = -EFAULT;
+
+        return ret;
+}
+
+static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
+{
+        slave_t *slave;
+        equalizer_t *eql;
+        struct net_device *slave_dev;
+        slave_config_t sc;
+        int ret;
+
+        if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
+                return -EFAULT;
+
+        slave_dev = dev_get_by_name(sc.slave_name);
+        if (!slave_dev)
+                return -ENODEV;
+
+        ret = -EINVAL;
+
+        eql = netdev_priv(dev);
+        spin_lock_bh(&eql->queue.lock);
+        if (eql_is_slave(slave_dev)) {
+                slave = __eql_find_slave_dev(&eql->queue, slave_dev);
+                if (slave) {
+                        slave->priority = sc.priority;
+                        slave->priority_bps = sc.priority;
+                        slave->priority_Bps = sc.priority / 8;
+                        ret = 0;
+                }
+        }
+        spin_unlock_bh(&eql->queue.lock);
+
+        return ret;
+}
+
+static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp)
+{
+        equalizer_t *eql;
+        master_config_t mc;
+
+        if (eql_is_master(dev)) {
+                eql = netdev_priv(dev);
+                mc.max_slaves = eql->max_slaves;
+                mc.min_slaves = eql->min_slaves;
+                if (copy_to_user(mcp, &mc, sizeof (master_config_t)))
+                        return -EFAULT;
+                return 0;
+        }
+        return -EINVAL;
+}
+
+static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mcp)
+{
+        equalizer_t *eql;
+        master_config_t mc;
+
+        if (copy_from_user(&mc, mcp, sizeof (master_config_t)))
+                return -EFAULT;
+
+        if (eql_is_master(dev)) {
+                eql = netdev_priv(dev);
+                eql->max_slaves = mc.max_slaves;
+                eql->min_slaves = mc.min_slaves;
+                return 0;
+        }
+        return -EINVAL;
+}
+
+static struct net_device *dev_eql;
+
+static int __init eql_init_module(void)
+{
+        int err;
+
+        printk(version);
+
+        dev_eql = alloc_netdev(sizeof(equalizer_t), "eql", eql_setup);
+        if (!dev_eql)
+                return -ENOMEM;
+
+        err = register_netdev(dev_eql);
+        if (err) 
+                free_netdev(dev_eql);
+        return err;
+}
+
+static void __exit eql_cleanup_module(void)
+{
+        unregister_netdev(dev_eql);
+        free_netdev(dev_eql);
+}
+
+module_init(eql_init_module);
+module_exit(eql_cleanup_module);
+MODULE_LICENSE("GPL");