cregit-Linux how code gets into the kernel

Release 4.10 drivers/net/eql.c

Directory: drivers/net
/*
 * 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
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/capability.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/netdevice.h>
#include <net/net_namespace.h>

#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_eql.h>
#include <linux/pkt_sched.h>

#include <linux/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 netdev_tx_t eql_slave_xmit(struct sk_buff *skb, 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_queue_t *queue, slave_t *slave);


static void eql_timer(unsigned long param) { equalizer_t *eql = (equalizer_t *) param; struct list_head *this, *tmp, *head; spin_lock(&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(&eql->queue, slave); } } spin_unlock(&eql->queue.lock); eql->timer.expires = jiffies + EQL_DEFAULT_RESCHED_IVAL; add_timer(&eql->timer); }

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david s. millerdavid s. miller9260.53%112.50%
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loic le loarerloic le loarer53.29%112.50%
eric dumazeteric dumazet21.32%112.50%
Total152100.00%8100.00%

static const char version[] __initconst = "Equalizer2002: Simon Janes (simon@ncm.com) and David S. Miller (davem@redhat.com)"; static const struct net_device_ops eql_netdev_ops = { .ndo_open = eql_open, .ndo_stop = eql_close, .ndo_do_ioctl = eql_ioctl, .ndo_start_xmit = eql_slave_xmit, };
static void __init eql_setup(struct net_device *dev) { equalizer_t *eql = netdev_priv(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->netdev_ops = &eql_netdev_ops; /* * 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 */ netif_keep_dst(dev); }

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david s. millerdavid s. miller7660.32%111.11%
pre-gitpre-git3326.19%222.22%
stephen hemmingerstephen hemminger118.73%333.33%
eric dumazeteric dumazet53.97%222.22%
jeff garzikjeff garzik10.79%111.11%
Total126100.00%9100.00%


static int eql_open(struct net_device *dev) { equalizer_t *eql = netdev_priv(dev); /* XXX We should force this off automatically for the user. */ netdev_info(dev, "remember to turn off Van-Jacobson compression on your slave devices\n"); BUG_ON(!list_empty(&eql->queue.all_slaves)); eql->min_slaves = 1; eql->max_slaves = EQL_DEFAULT_MAX_SLAVES; /* 4 usually... */ add_timer(&eql->timer); return 0; }

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joe perchesjoe perches34.55%114.29%
stephen hemmingerstephen hemminger34.55%114.29%
eric sesterhenneric sesterhenn34.55%114.29%
Total66100.00%7100.00%


static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave) { list_del(&slave->list); queue->num_slaves--; slave->dev->flags &= ~IFF_SLAVE; dev_put(slave->dev); kfree(slave); }

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loic le loarerloic le loarer918.75%133.33%
Total48100.00%3100.00%


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(queue, s); } spin_unlock_bh(&queue->lock); }

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loic le loarerloic le loarer22.70%133.33%
Total74100.00%3100.00%


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; }

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stephen hemmingerstephen hemminger37.50%125.00%
jeff garzikjeff garzik12.50%125.00%
Total40100.00%4100.00%

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; } }

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/* 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(queue, slave); } } return best_slave; }

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loic le loarerloic le loarer21.27%133.33%
Total157100.00%3100.00%


static netdev_tx_t 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 = TC_PRIO_FILLER; slave->bytes_queued += skb->len; dev_queue_xmit(skb); dev->stats.tx_packets++; } else { dev->stats.tx_dropped++; dev_kfree_skb(skb); } spin_unlock(&eql->queue.lock); return NETDEV_TX_OK; }

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stephen hemmingerstephen hemminger43.23%228.57%
jeff garzikjeff garzik21.61%114.29%
eric dumazeteric dumazet10.81%114.29%
patrick mchardypatrick mchardy10.81%114.29%
Total124100.00%7100.00%

/* * 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; }

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Total66100.00%5100.00%


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; }

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stephen hemmingerstephen hemminger37.89%133.33%
Total38100.00%3100.00%

/* 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) eql_kill_one_slave(queue, duplicate_slave); dev_hold(slave->dev); list_add(&slave->list, &queue->all_slaves); queue->num_slaves++; slave->dev->flags |= IFF_SLAVE; return 0; } return -ENOSPC; }

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ying xueying xue77.61%116.67%
loic le loarerloic le loarer22.17%116.67%
linus torvaldslinus torvalds11.09%116.67%
stephen hemmingerstephen hemminger11.09%116.67%
Total92100.00%6100.00%


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(&init_net, srq.slave_name); if (!slave_dev) return -ENODEV; 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) 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) kfree(s); spin_unlock_bh(&eql->queue.lock); return ret; } } return -EINVAL; }

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linus torvaldslinus torvalds94.02%112.50%
ying xueying xue62.68%112.50%
stephen hemmingerstephen hemminger31.34%112.50%
eric w. biedermaneric w. biederman31.34%112.50%
al viroal viro10.45%112.50%
Total224100.00%8100.00%


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(&init_net, srq.slave_name); if (!slave_dev) return -ENODEV; ret = -EINVAL; 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(&eql->queue, slave); ret = 0; } } spin_unlock_bh(&eql->queue.lock); return ret; }

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ying xueying xue106.80%112.50%
loic le loarerloic le loarer53.40%112.50%
stephen hemmingerstephen hemminger32.04%112.50%
eric w. biedermaneric w. biederman32.04%112.50%
al viroal viro10.68%112.50%
Total147100.00%8100.00%


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(&init_net, 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); if (!ret && copy_to_user(scp, &sc, sizeof (slave_config_t))) ret = -EFAULT; return ret; }

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david s. millerdavid s. miller11467.06%112.50%
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andrew mortonandrew morton95.29%112.50%
eric w. biedermaneric w. biederman31.76%112.50%
stephen hemmingerstephen hemminger31.76%112.50%
linus torvaldslinus torvalds21.18%112.50%
ying xueying xue10.59%112.50%
al viroal viro10.59%112.50%
Total170100.00%8100.00%


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(&init_net, 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; }

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david s. millerdavid s. miller8249.10%112.50%
pre-gitpre-git5834.73%112.50%
andrew mortonandrew morton137.78%112.50%
linus torvaldslinus torvalds63.59%112.50%
eric w. biedermaneric w. biederman31.80%112.50%
stephen hemmingerstephen hemminger31.80%112.50%
al viroal viro10.60%112.50%
ying xueying xue10.60%112.50%
Total167100.00%8100.00%


static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp) { equalizer_t *eql; master_config_t mc; memset(&mc, 0, sizeof(master_config_t)); 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; }

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dan rosenbergdan rosenberg1313.83%120.00%
pre-gitpre-git1212.77%120.00%
stephen hemmingerstephen hemminger33.19%120.00%
al viroal viro11.06%120.00%
Total94100.00%5100.00%


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; }

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david s. millerdavid s. miller6479.01%125.00%
pre-gitpre-git1316.05%125.00%
stephen hemmingerstephen hemminger33.70%125.00%
al viroal viro11.23%125.00%
Total81100.00%4100.00%

static struct net_device *dev_eql;
static int __init eql_init_module(void) { int err; pr_info("%s\n", version); dev_eql = alloc_netdev(sizeof(equalizer_t), "eql", NET_NAME_UNKNOWN, eql_setup); if (!dev_eql) return -ENOMEM; err = register_netdev(dev_eql); if (err) free_netdev(dev_eql); return err; }

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stephen hemmingerstephen hemminger3047.62%114.29%
pre-gitpre-git2742.86%342.86%
joe perchesjoe perches34.76%114.29%
tom gundersentom gundersen23.17%114.29%
francois romieufrancois romieu11.59%114.29%
Total63100.00%7100.00%


static void __exit eql_cleanup_module(void) { unregister_netdev(dev_eql); free_netdev(dev_eql); }

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stephen hemmingerstephen hemminger210.53%233.33%
Total19100.00%6100.00%

module_init(eql_init_module); module_exit(eql_cleanup_module); MODULE_LICENSE("GPL");

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stephen hemmingerstephen hemminger1074.54%716.28%
loic le loarerloic le loarer291.23%12.33%
ying xueying xue251.06%12.33%
linus torvaldslinus torvalds241.02%36.98%
andrew mortonandrew morton220.93%12.33%
eric w. biedermaneric w. biederman150.64%12.33%
joe perchesjoe perches140.59%12.33%
dan rosenbergdan rosenberg130.55%12.33%
al viroal viro120.51%12.33%
eric dumazeteric dumazet110.47%36.98%
jeff garzikjeff garzik60.25%24.65%
eric sesterhenneric sesterhenn30.13%12.33%
tejun heotejun heo30.13%12.33%
alexey dobriyanalexey dobriyan30.13%12.33%
tom gundersentom gundersen20.08%12.33%
francois romieufrancois romieu10.04%12.33%
patrick mchardypatrick mchardy10.04%12.33%
Total2357100.00%43100.00%
Directory: drivers/net
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