Return to sch_netem.c CVS log

Up to [Development] / linux-2.6-xfs / net / sched

Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

/*
 * net/sched/sch_netem.c	Network emulator
 *
 * 		This program is free software; you can redistribute it and/or
 * 		modify it under the terms of the GNU General Public License
 * 		as published by the Free Software Foundation; either version
 * 		2 of the License.
 *
 *  		Many of the algorithms and ideas for this came from
 *		NIST Net which is not copyrighted.
 *
 * Authors:	Stephen Hemminger <shemminger@osdl.org>
 *		Catalin(ux aka Dino) BOIE <catab at umbrella dot ro>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>

#include <net/netlink.h>
#include <net/pkt_sched.h>

#define VERSION "1.2"

/*	Network Emulation Queuing algorithm.
	====================================

	Sources: [1] Mark Carson, Darrin Santay, "NIST Net - A Linux-based
		 Network Emulation Tool
		 [2] Luigi Rizzo, DummyNet for FreeBSD

	 ----------------------------------------------------------------

	 This started out as a simple way to delay outgoing packets to
	 test TCP but has grown to include most of the functionality
	 of a full blown network emulator like NISTnet. It can delay
	 packets and add random jitter (and correlation). The random
	 distribution can be loaded from a table as well to provide
	 normal, Pareto, or experimental curves. Packet loss,
	 duplication, and reordering can also be emulated.

	 This qdisc does not do classification that can be handled in
	 layering other disciplines.  It does not need to do bandwidth
	 control either since that can be handled by using token
	 bucket or other rate control.

	 The simulator is limited by the Linux timer resolution
	 and will create packet bursts on the HZ boundary (1ms).
*/

struct netem_sched_data {
	struct Qdisc	*qdisc;
	struct qdisc_watchdog watchdog;

	psched_tdiff_t latency;
	psched_tdiff_t jitter;

	u32 loss;
	u32 limit;
	u32 counter;
	u32 gap;
	u32 duplicate;
	u32 reorder;
	u32 corrupt;

	struct crndstate {
		u32 last;
		u32 rho;
	} delay_cor, loss_cor, dup_cor, reorder_cor, corrupt_cor;

	struct disttable {
		u32  size;
		s16 table[0];
	} *delay_dist;
};

/* Time stamp put into socket buffer control block */
struct netem_skb_cb {
	psched_time_t	time_to_send;
};

/* init_crandom - initialize correlated random number generator
 * Use entropy source for initial seed.
 */
static void init_crandom(struct crndstate *state, unsigned long rho)
{
	state->rho = rho;
	state->last = net_random();
}

/* get_crandom - correlated random number generator
 * Next number depends on last value.
 * rho is scaled to avoid floating point.
 */
static u32 get_crandom(struct crndstate *state)
{
	u64 value, rho;
	unsigned long answer;

	if (state->rho == 0)	/* no correlation */
		return net_random();

	value = net_random();
	rho = (u64)state->rho + 1;
	answer = (value * ((1ull<<32) - rho) + state->last * rho) >> 32;
	state->last = answer;
	return answer;
}

/* tabledist - return a pseudo-randomly distributed value with mean mu and
 * std deviation sigma.  Uses table lookup to approximate the desired
 * distribution, and a uniformly-distributed pseudo-random source.
 */
static psched_tdiff_t tabledist(psched_tdiff_t mu, psched_tdiff_t sigma,
				struct crndstate *state,
				const struct disttable *dist)
{
	psched_tdiff_t x;
	long t;
	u32 rnd;

	if (sigma == 0)
		return mu;

	rnd = get_crandom(state);

	/* default uniform distribution */
	if (dist == NULL)
		return (rnd % (2*sigma)) - sigma + mu;

	t = dist->table[rnd % dist->size];
	x = (sigma % NETEM_DIST_SCALE) * t;
	if (x >= 0)
		x += NETEM_DIST_SCALE/2;
	else
		x -= NETEM_DIST_SCALE/2;

	return  x / NETEM_DIST_SCALE + (sigma / NETEM_DIST_SCALE) * t + mu;
}

/*
 * Insert one skb into qdisc.
 * Note: parent depends on return value to account for queue length.
 * 	NET_XMIT_DROP: queue length didn't change.
 *      NET_XMIT_SUCCESS: one skb was queued.
 */
static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	/* We don't fill cb now as skb_unshare() may invalidate it */
	struct netem_skb_cb *cb;
	struct sk_buff *skb2;
	int ret;
	int count = 1;

	pr_debug("netem_enqueue skb=%p\n", skb);

	/* Random duplication */
	if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor))
		++count;

	/* Random packet drop 0 => none, ~0 => all */
	if (q->loss && q->loss >= get_crandom(&q->loss_cor))
		--count;

	if (count == 0) {
		sch->qstats.drops++;
		kfree_skb(skb);
		return NET_XMIT_BYPASS;
	}

	skb_orphan(skb);

	/*
	 * If we need to duplicate packet, then re-insert at top of the
	 * qdisc tree, since parent queuer expects that only one
	 * skb will be queued.
	 */
	if (count > 1 && (skb2 = skb_clone(skb, GFP_ATOMIC)) != NULL) {
		struct Qdisc *rootq = sch->dev->qdisc;
		u32 dupsave = q->duplicate; /* prevent duplicating a dup... */
		q->duplicate = 0;

		rootq->enqueue(skb2, rootq);
		q->duplicate = dupsave;
	}

	/*
	 * Randomized packet corruption.
	 * Make copy if needed since we are modifying
	 * If packet is going to be hardware checksummed, then
	 * do it now in software before we mangle it.
	 */
	if (q->corrupt && q->corrupt >= get_crandom(&q->corrupt_cor)) {
		if (!(skb = skb_unshare(skb, GFP_ATOMIC))
		    || (skb->ip_summed == CHECKSUM_PARTIAL
			&& skb_checksum_help(skb))) {
			sch->qstats.drops++;
			return NET_XMIT_DROP;
		}

		skb->data[net_random() % skb_headlen(skb)] ^= 1<<(net_random() % 8);
	}

	cb = (struct netem_skb_cb *)skb->cb;
	if (q->gap == 0 		/* not doing reordering */
	    || q->counter < q->gap 	/* inside last reordering gap */
	    || q->reorder < get_crandom(&q->reorder_cor)) {
		psched_time_t now;
		psched_tdiff_t delay;

		delay = tabledist(q->latency, q->jitter,
				  &q->delay_cor, q->delay_dist);

		now = psched_get_time();
		cb->time_to_send = now + delay;
		++q->counter;
		ret = q->qdisc->enqueue(skb, q->qdisc);
	} else {
		/*
		 * Do re-ordering by putting one out of N packets at the front
		 * of the queue.
		 */
		cb->time_to_send = psched_get_time();
		q->counter = 0;
		ret = q->qdisc->ops->requeue(skb, q->qdisc);
	}

	if (likely(ret == NET_XMIT_SUCCESS)) {
		sch->q.qlen++;
		sch->bstats.bytes += skb->len;
		sch->bstats.packets++;
	} else
		sch->qstats.drops++;

	pr_debug("netem: enqueue ret %d\n", ret);
	return ret;
}

/* Requeue packets but don't change time stamp */
static int netem_requeue(struct sk_buff *skb, struct Qdisc *sch)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	int ret;

	if ((ret = q->qdisc->ops->requeue(skb, q->qdisc)) == 0) {
		sch->q.qlen++;
		sch->qstats.requeues++;
	}

	return ret;
}

static unsigned int netem_drop(struct Qdisc* sch)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	unsigned int len = 0;

	if (q->qdisc->ops->drop && (len = q->qdisc->ops->drop(q->qdisc)) != 0) {
		sch->q.qlen--;
		sch->qstats.drops++;
	}
	return len;
}

static struct sk_buff *netem_dequeue(struct Qdisc *sch)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	struct sk_buff *skb;

	smp_mb();
	if (sch->flags & TCQ_F_THROTTLED)
		return NULL;

	skb = q->qdisc->dequeue(q->qdisc);
	if (skb) {
		const struct netem_skb_cb *cb
			= (const struct netem_skb_cb *)skb->cb;
		psched_time_t now = psched_get_time();

		/* if more time remaining? */
		if (cb->time_to_send <= now) {
			pr_debug("netem_dequeue: return skb=%p\n", skb);
			sch->q.qlen--;
			return skb;
		}

		if (unlikely(q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS)) {
			qdisc_tree_decrease_qlen(q->qdisc, 1);
			sch->qstats.drops++;
			printk(KERN_ERR "netem: %s could not requeue\n",
			       q->qdisc->ops->id);
		}

		qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send);
	}

	return NULL;
}

static void netem_reset(struct Qdisc *sch)
{
	struct netem_sched_data *q = qdisc_priv(sch);

	qdisc_reset(q->qdisc);
	sch->q.qlen = 0;
	qdisc_watchdog_cancel(&q->watchdog);
}

/* Pass size change message down to embedded FIFO */
static int set_fifo_limit(struct Qdisc *q, int limit)
{
	struct rtattr *rta;
	int ret = -ENOMEM;

	/* Hack to avoid sending change message to non-FIFO */
	if (strncmp(q->ops->id + 1, "fifo", 4) != 0)
		return 0;

	rta = kmalloc(RTA_LENGTH(sizeof(struct tc_fifo_qopt)), GFP_KERNEL);
	if (rta) {
		rta->rta_type = RTM_NEWQDISC;
		rta->rta_len = RTA_LENGTH(sizeof(struct tc_fifo_qopt));
		((struct tc_fifo_qopt *)RTA_DATA(rta))->limit = limit;

		ret = q->ops->change(q, rta);
		kfree(rta);
	}
	return ret;
}

/*
 * Distribution data is a variable size payload containing
 * signed 16 bit values.
 */
static int get_dist_table(struct Qdisc *sch, const struct rtattr *attr)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	unsigned long n = RTA_PAYLOAD(attr)/sizeof(__s16);
	const __s16 *data = RTA_DATA(attr);
	struct disttable *d;
	int i;

	if (n > 65536)
		return -EINVAL;

	d = kmalloc(sizeof(*d) + n*sizeof(d->table[0]), GFP_KERNEL);
	if (!d)
		return -ENOMEM;

	d->size = n;
	for (i = 0; i < n; i++)
		d->table[i] = data[i];

	spin_lock_bh(&sch->dev->queue_lock);
	d = xchg(&q->delay_dist, d);
	spin_unlock_bh(&sch->dev->queue_lock);

	kfree(d);
	return 0;
}

static int get_correlation(struct Qdisc *sch, const struct rtattr *attr)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	const struct tc_netem_corr *c = RTA_DATA(attr);

	if (RTA_PAYLOAD(attr) != sizeof(*c))
		return -EINVAL;

	init_crandom(&q->delay_cor, c->delay_corr);
	init_crandom(&q->loss_cor, c->loss_corr);
	init_crandom(&q->dup_cor, c->dup_corr);
	return 0;
}

static int get_reorder(struct Qdisc *sch, const struct rtattr *attr)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	const struct tc_netem_reorder *r = RTA_DATA(attr);

	if (RTA_PAYLOAD(attr) != sizeof(*r))
		return -EINVAL;

	q->reorder = r->probability;
	init_crandom(&q->reorder_cor, r->correlation);
	return 0;
}

static int get_corrupt(struct Qdisc *sch, const struct rtattr *attr)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	const struct tc_netem_corrupt *r = RTA_DATA(attr);

	if (RTA_PAYLOAD(attr) != sizeof(*r))
		return -EINVAL;

	q->corrupt = r->probability;
	init_crandom(&q->corrupt_cor, r->correlation);
	return 0;
}

/* Parse netlink message to set options */
static int netem_change(struct Qdisc *sch, struct rtattr *opt)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	struct tc_netem_qopt *qopt;
	int ret;

	if (opt == NULL || RTA_PAYLOAD(opt) < sizeof(*qopt))
		return -EINVAL;

	qopt = RTA_DATA(opt);
	ret = set_fifo_limit(q->qdisc, qopt->limit);
	if (ret) {
		pr_debug("netem: can't set fifo limit\n");
		return ret;
	}

	q->latency = qopt->latency;
	q->jitter = qopt->jitter;
	q->limit = qopt->limit;
	q->gap = qopt->gap;
	q->counter = 0;
	q->loss = qopt->loss;
	q->duplicate = qopt->duplicate;

	/* for compatibility with earlier versions.
	 * if gap is set, need to assume 100% probability
	 */
	if (q->gap)
		q->reorder = ~0;

	/* Handle nested options after initial queue options.
	 * Should have put all options in nested format but too late now.
	 */
	if (RTA_PAYLOAD(opt) > sizeof(*qopt)) {
		struct rtattr *tb[TCA_NETEM_MAX];
		if (rtattr_parse(tb, TCA_NETEM_MAX,
				 RTA_DATA(opt) + sizeof(*qopt),
				 RTA_PAYLOAD(opt) - sizeof(*qopt)))
			return -EINVAL;

		if (tb[TCA_NETEM_CORR-1]) {
			ret = get_correlation(sch, tb[TCA_NETEM_CORR-1]);
			if (ret)
				return ret;
		}

		if (tb[TCA_NETEM_DELAY_DIST-1]) {
			ret = get_dist_table(sch, tb[TCA_NETEM_DELAY_DIST-1]);
			if (ret)
				return ret;
		}

		if (tb[TCA_NETEM_REORDER-1]) {
			ret = get_reorder(sch, tb[TCA_NETEM_REORDER-1]);
			if (ret)
				return ret;
		}

		if (tb[TCA_NETEM_CORRUPT-1]) {
			ret = get_corrupt(sch, tb[TCA_NETEM_CORRUPT-1]);
			if (ret)
				return ret;
		}
	}

	return 0;
}

/*
 * Special case version of FIFO queue for use by netem.
 * It queues in order based on timestamps in skb's
 */
struct fifo_sched_data {
	u32 limit;
	psched_time_t oldest;
};

static int tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch)
{
	struct fifo_sched_data *q = qdisc_priv(sch);
	struct sk_buff_head *list = &sch->q;
	psched_time_t tnext = ((struct netem_skb_cb *)nskb->cb)->time_to_send;
	struct sk_buff *skb;

	if (likely(skb_queue_len(list) < q->limit)) {
		/* Optimize for add at tail */
		if (likely(skb_queue_empty(list) || tnext >= q->oldest)) {
			q->oldest = tnext;
			return qdisc_enqueue_tail(nskb, sch);
		}

		skb_queue_reverse_walk(list, skb) {
			const struct netem_skb_cb *cb
				= (const struct netem_skb_cb *)skb->cb;

			if (tnext >= cb->time_to_send)
				break;
		}

		__skb_queue_after(list, skb, nskb);

		sch->qstats.backlog += nskb->len;
		sch->bstats.bytes += nskb->len;
		sch->bstats.packets++;

		return NET_XMIT_SUCCESS;
	}

	return qdisc_reshape_fail(nskb, sch);
}

static int tfifo_init(struct Qdisc *sch, struct rtattr *opt)
{
	struct fifo_sched_data *q = qdisc_priv(sch);

	if (opt) {
		struct tc_fifo_qopt *ctl = RTA_DATA(opt);
		if (RTA_PAYLOAD(opt) < sizeof(*ctl))
			return -EINVAL;

		q->limit = ctl->limit;
	} else
		q->limit = max_t(u32, sch->dev->tx_queue_len, 1);

	q->oldest = PSCHED_PASTPERFECT;
	return 0;
}

static int tfifo_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct fifo_sched_data *q = qdisc_priv(sch);
	struct tc_fifo_qopt opt = { .limit = q->limit };

	RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
	return skb->len;

rtattr_failure:
	return -1;
}

static struct Qdisc_ops tfifo_qdisc_ops = {
	.id		=	"tfifo",
	.priv_size	=	sizeof(struct fifo_sched_data),
	.enqueue	=	tfifo_enqueue,
	.dequeue	=	qdisc_dequeue_head,
	.requeue	=	qdisc_requeue,
	.drop		=	qdisc_queue_drop,
	.init		=	tfifo_init,
	.reset		=	qdisc_reset_queue,
	.change		=	tfifo_init,
	.dump		=	tfifo_dump,
};

static int netem_init(struct Qdisc *sch, struct rtattr *opt)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	int ret;

	if (!opt)
		return -EINVAL;

	qdisc_watchdog_init(&q->watchdog, sch);

	q->qdisc = qdisc_create_dflt(sch->dev, &tfifo_qdisc_ops,
				     TC_H_MAKE(sch->handle, 1));
	if (!q->qdisc) {
		pr_debug("netem: qdisc create failed\n");
		return -ENOMEM;
	}

	ret = netem_change(sch, opt);
	if (ret) {
		pr_debug("netem: change failed\n");
		qdisc_destroy(q->qdisc);
	}
	return ret;
}

static void netem_destroy(struct Qdisc *sch)
{
	struct netem_sched_data *q = qdisc_priv(sch);

	qdisc_watchdog_cancel(&q->watchdog);
	qdisc_destroy(q->qdisc);
	kfree(q->delay_dist);
}

static int netem_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	const struct netem_sched_data *q = qdisc_priv(sch);
	unsigned char *b = skb_tail_pointer(skb);
	struct rtattr *rta = (struct rtattr *) b;
	struct tc_netem_qopt qopt;
	struct tc_netem_corr cor;
	struct tc_netem_reorder reorder;
	struct tc_netem_corrupt corrupt;

	qopt.latency = q->latency;
	qopt.jitter = q->jitter;
	qopt.limit = q->limit;
	qopt.loss = q->loss;
	qopt.gap = q->gap;
	qopt.duplicate = q->duplicate;
	RTA_PUT(skb, TCA_OPTIONS, sizeof(qopt), &qopt);

	cor.delay_corr = q->delay_cor.rho;
	cor.loss_corr = q->loss_cor.rho;
	cor.dup_corr = q->dup_cor.rho;
	RTA_PUT(skb, TCA_NETEM_CORR, sizeof(cor), &cor);

	reorder.probability = q->reorder;
	reorder.correlation = q->reorder_cor.rho;
	RTA_PUT(skb, TCA_NETEM_REORDER, sizeof(reorder), &reorder);

	corrupt.probability = q->corrupt;
	corrupt.correlation = q->corrupt_cor.rho;
	RTA_PUT(skb, TCA_NETEM_CORRUPT, sizeof(corrupt), &corrupt);

	rta->rta_len = skb_tail_pointer(skb) - b;

	return skb->len;

rtattr_failure:
	nlmsg_trim(skb, b);
	return -1;
}

static int netem_dump_class(struct Qdisc *sch, unsigned long cl,
			  struct sk_buff *skb, struct tcmsg *tcm)
{
	struct netem_sched_data *q = qdisc_priv(sch);

	if (cl != 1) 	/* only one class */
		return -ENOENT;

	tcm->tcm_handle |= TC_H_MIN(1);
	tcm->tcm_info = q->qdisc->handle;

	return 0;
}

static int netem_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
		     struct Qdisc **old)
{
	struct netem_sched_data *q = qdisc_priv(sch);

	if (new == NULL)
		new = &noop_qdisc;

	sch_tree_lock(sch);
	*old = xchg(&q->qdisc, new);
	qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
	qdisc_reset(*old);
	sch_tree_unlock(sch);

	return 0;
}

static struct Qdisc *netem_leaf(struct Qdisc *sch, unsigned long arg)
{
	struct netem_sched_data *q = qdisc_priv(sch);
	return q->qdisc;
}

static unsigned long netem_get(struct Qdisc *sch, u32 classid)
{
	return 1;
}

static void netem_put(struct Qdisc *sch, unsigned long arg)
{
}

static int netem_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
			    struct rtattr **tca, unsigned long *arg)
{
	return -ENOSYS;
}

static int netem_delete(struct Qdisc *sch, unsigned long arg)
{
	return -ENOSYS;
}

static void netem_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
	if (!walker->stop) {
		if (walker->count >= walker->skip)
			if (walker->fn(sch, 1, walker) < 0) {
				walker->stop = 1;
				return;
			}
		walker->count++;
	}
}

static struct tcf_proto **netem_find_tcf(struct Qdisc *sch, unsigned long cl)
{
	return NULL;
}

static struct Qdisc_class_ops netem_class_ops = {
	.graft		=	netem_graft,
	.leaf		=	netem_leaf,
	.get		=	netem_get,
	.put		=	netem_put,
	.change		=	netem_change_class,
	.delete		=	netem_delete,
	.walk		=	netem_walk,
	.tcf_chain	=	netem_find_tcf,
	.dump		=	netem_dump_class,
};

static struct Qdisc_ops netem_qdisc_ops = {
	.id		=	"netem",
	.cl_ops		=	&netem_class_ops,
	.priv_size	=	sizeof(struct netem_sched_data),
	.enqueue	=	netem_enqueue,
	.dequeue	=	netem_dequeue,
	.requeue	=	netem_requeue,
	.drop		=	netem_drop,
	.init		=	netem_init,
	.reset		=	netem_reset,
	.destroy	=	netem_destroy,
	.change		=	netem_change,
	.dump		=	netem_dump,
	.owner		=	THIS_MODULE,
};


static int __init netem_module_init(void)
{
	pr_info("netem: version " VERSION "\n");
	return register_qdisc(&netem_qdisc_ops);
}
static void __exit netem_module_exit(void)
{
	unregister_qdisc(&netem_qdisc_ops);
}
module_init(netem_module_init)
module_exit(netem_module_exit)
MODULE_LICENSE("GPL");