Message-ID: <20070618184224.12274.36798.stgit@localhost.localdomain>
Date:	Mon, 18 Jun 2007 11:42:24 -0700
From:	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, jeff@...zik.org, auke-jan.h.kok@...el.com,
	hadi@...erus.ca, kaber@...sh.net
Subject: [PATCH 2/3] NET: [SCHED] Qdisc changes and sch_rr added for multiqueue

Add the new sch_rr qdisc for multiqueue network device support.
Allow sch_prio to be compiled with or without multiqueue hardware
support.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
---

 include/linux/pkt_sched.h |   11 +
 net/sched/Kconfig         |   22 ++
 net/sched/Makefile        |    1 
 net/sched/sch_generic.c   |    3 
 net/sched/sch_prio.c      |   64 +++++-
 net/sched/sch_rr.c        |  516 +++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 610 insertions(+), 7 deletions(-)

diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index d10f353..0d1adaf 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -22,6 +22,7 @@
 #define TC_PRIO_CONTROL			7
 
 #define TC_PRIO_MAX			15
+#define TC_RR_MAX			15
 
 /* Generic queue statistics, available for all the elements.
    Particular schedulers may have also their private records.
@@ -90,6 +91,16 @@ struct tc_fifo_qopt
 	__u32	limit;	/* Queue length: bytes for bfifo, packets for pfifo */
 };
 
+/* RR section */
+#define TCQ_RR_BANDS	16
+#define TCQ_MIN_RR_BANDS 2
+
+struct tc_rr_qopt
+{
+	int	bands;			/* Number of bands */
+	__u8	priomap[TC_RR_MAX+1];	/* Map: Linux priority -> RR band */
+};
+
 /* PRIO section */
 
 #define TCQ_PRIO_BANDS	16
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index 475df84..a532554 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -111,6 +111,28 @@ config NET_SCH_PRIO
 	  To compile this code as a module, choose M here: the
 	  module will be called sch_prio.
 
+config NET_SCH_PRIO_MQ
+	bool "Multiple hardware queue support for PRIO"
+	depends on NET_SCH_PRIO
+	---help---
+	  Say Y here if you want to allow the PRIO qdisc to assign
+	  flows to multiple hardware queues on an ethernet device.  This
+	  will still work on devices with 1 queue.
+
+	  Consider this scheduler for devices that do not use
+	  hardware-based scheduling policies.  Otherwise, use NET_SCH_RR.
+
+	  Most people will say N here.
+
+config NET_SCH_RR
+	tristate "Multi Band Round Robin Queuing (RR)"
+	---help---
+	  Say Y here if you want to use an n-band round robin packet
+	  scheduler.
+
+	  To compile this code as a module, choose M here: the
+	  module will be caleld sch_rr.
+
 config NET_SCH_RED
 	tristate "Random Early Detection (RED)"
 	---help---
diff --git a/net/sched/Makefile b/net/sched/Makefile
index 020767a..d3ed44e 100644
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_NET_SCH_SFQ)	+= sch_sfq.o
 obj-$(CONFIG_NET_SCH_TBF)	+= sch_tbf.o
 obj-$(CONFIG_NET_SCH_TEQL)	+= sch_teql.o
 obj-$(CONFIG_NET_SCH_PRIO)	+= sch_prio.o
+obj-$(CONFIG_NET_SCH_RR)	+= sch_rr.o
 obj-$(CONFIG_NET_SCH_ATM)	+= sch_atm.o
 obj-$(CONFIG_NET_SCH_NETEM)	+= sch_netem.o
 obj-$(CONFIG_NET_CLS_U32)	+= cls_u32.o
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 9461e8a..203d5c4 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -168,7 +168,8 @@ static inline int qdisc_restart(struct net_device *dev)
 	spin_unlock(&dev->queue_lock);
 
 	ret = NETDEV_TX_BUSY;
-	if (!netif_queue_stopped(dev))
+	if (!netif_queue_stopped(dev) &&
+	    !netif_subqueue_stopped(dev, skb->queue_mapping))
 		/* churn baby churn .. */
 		ret = dev_hard_start_xmit(skb, dev);
 
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 6d7542c..44ecdc6 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -43,6 +43,7 @@ struct prio_sched_data
 	struct tcf_proto *filter_list;
 	u8  prio2band[TC_PRIO_MAX+1];
 	struct Qdisc *queues[TCQ_PRIO_BANDS];
+	u16 band2queue[TC_PRIO_MAX + 1];
 };
 
 
@@ -70,14 +71,25 @@ prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 #endif
 			if (TC_H_MAJ(band))
 				band = 0;
+#ifdef CONFIG_NET_SCH_PRIO_MQ
+			skb->queue_mapping =
+				q->band2queue[q->prio2band[band&TC_PRIO_MAX]];
+#endif
 			return q->queues[q->prio2band[band&TC_PRIO_MAX]];
 		}
 		band = res.classid;
 	}
 	band = TC_H_MIN(band) - 1;
-	if (band >= q->bands)
+	if (band >= q->bands) {
+#ifdef CONFIG_NET_SCH_PRIO_MQ
+ 		skb->queue_mapping = q->band2queue[q->prio2band[0]];
+#endif
 		return q->queues[q->prio2band[0]];
+	}
 
+#ifdef CONFIG_NET_SCH_PRIO_MQ
+ 	skb->queue_mapping = q->band2queue[band];
+#endif
 	return q->queues[band];
 }
 
@@ -144,12 +156,22 @@ prio_dequeue(struct Qdisc* sch)
 	struct Qdisc *qdisc;
 
 	for (prio = 0; prio < q->bands; prio++) {
-		qdisc = q->queues[prio];
-		skb = qdisc->dequeue(qdisc);
-		if (skb) {
-			sch->q.qlen--;
-			return skb;
+#ifdef CONFIG_NET_SCH_PRIO_MQ
+		/* Check if the target subqueue is available before
+		 * pulling an skb.  This way we avoid excessive requeues
+		 * for slower queues.
+		 */
+		if (!netif_subqueue_stopped(sch->dev, q->band2queue[prio])) {
+#endif
+			qdisc = q->queues[prio];
+			skb = qdisc->dequeue(qdisc);
+			if (skb) {
+				sch->q.qlen--;
+				return skb;
+			}
+#ifdef CONFIG_NET_SCH_PRIO_MQ
 		}
+#endif
 	}
 	return NULL;
 
@@ -200,6 +222,10 @@ static int prio_tune(struct Qdisc *sch, struct rtattr *opt)
 	struct prio_sched_data *q = qdisc_priv(sch);
 	struct tc_prio_qopt *qopt = RTA_DATA(opt);
 	int i;
+	int queue;
+	int qmapoffset;
+	int offset;
+	int mod;
 
 	if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
 		return -EINVAL;
@@ -242,6 +268,32 @@ static int prio_tune(struct Qdisc *sch, struct rtattr *opt)
 			}
 		}
 	}
+#ifdef CONFIG_NET_SCH_PRIO_MQ
+	/* setup queue to band mapping */
+	if (q->bands < sch->dev->egress_subqueue_count) {
+		qmapoffset = 1;
+		mod = sch->dev->egress_subqueue_count;
+	} else {
+		mod = q->bands % sch->dev->egress_subqueue_count;
+		qmapoffset = q->bands / sch->dev->egress_subqueue_count
+				+ ((mod) ? 1 : 0);
+	}
+
+	queue = 0;
+	offset = 0;
+	for (i = 0; i < q->bands; i++) {
+		q->band2queue[i] = queue;
+		if ( ((i + 1) - offset) == qmapoffset) {
+			queue++;
+			offset += qmapoffset;
+			if (mod)
+				mod--;
+			qmapoffset = q->bands /
+				sch->dev->egress_subqueue_count +
+				((mod) ? 1 : 0);
+		}
+	}
+#endif
 	return 0;
 }
 
diff --git a/net/sched/sch_rr.c b/net/sched/sch_rr.c
new file mode 100644
index 0000000..ce9f237
--- /dev/null
+++ b/net/sched/sch_rr.c
@@ -0,0 +1,516 @@
+/*
+ * net/sched/sch_rr.c	Simple n-band round-robin scheduler.
+ *
+ *		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, or (at your option) any later version.
+ *
+ * The core part of this qdisc is based on sch_prio.  ->dequeue() is where
+ * this scheduler functionally differs.
+ *
+ * Author:	PJ Waskiewicz, <peter.p.waskiewicz.jr@...el.com>
+ *
+ * Original Authors (from PRIO): Alexey Kuznetsov, <kuznet@....inr.ac.ru>
+ * Fixes:       19990609: J Hadi Salim <hadi@...telnetworks.com>:
+ *              Init --  EINVAL when opt undefined
+ */
+
+#include <linux/module.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/notifier.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <linux/skbuff.h>
+#include <net/netlink.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+
+
+struct rr_sched_data
+{
+	int bands;
+	int curband;
+	struct tcf_proto *filter_list;
+	u8  prio2band[TC_RR_MAX + 1];
+	struct Qdisc *queues[TCQ_RR_BANDS];
+	u16 band2queue[TC_RR_MAX + 1];
+};
+
+
+static struct Qdisc *rr_classify(struct sk_buff *skb, struct Qdisc *sch,
+				 int *qerr)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	u32 band = skb->priority;
+	struct tcf_result res;
+
+	*qerr = NET_XMIT_BYPASS;
+	if (TC_H_MAJ(skb->priority) != sch->handle) {
+#ifdef CONFIG_NET_CLS_ACT
+		switch (tc_classify(skb, q->filter_list, &res)) {
+		case TC_ACT_STOLEN:
+		case TC_ACT_QUEUED:
+			*qerr = NET_XMIT_SUCCESS;
+		case TC_ACT_SHOT:
+			return NULL;
+		}
+
+		if (!q->filter_list ) {
+#else
+		if (!q->filter_list || tc_classify(skb, q->filter_list, &res)) {
+#endif
+			if (TC_H_MAJ(band))
+				band = 0;
+ 			skb->queue_mapping =
+ 				  q->band2queue[q->prio2band[band&TC_RR_MAX]];
+
+			return q->queues[q->prio2band[band&TC_RR_MAX]];
+		}
+		band = res.classid;
+	}
+	band = TC_H_MIN(band) - 1;
+	if (band > q->bands) {
+ 		skb->queue_mapping = q->band2queue[q->prio2band[0]];
+		return q->queues[q->prio2band[0]];
+	}
+
+ 	skb->queue_mapping = q->band2queue[band];
+
+	return q->queues[band];
+}
+
+static int rr_enqueue(struct sk_buff *skb, struct Qdisc *sch)
+{
+	struct Qdisc *qdisc;
+	int ret;
+
+	qdisc = rr_classify(skb, sch, &ret);
+#ifdef CONFIG_NET_CLS_ACT
+	if (qdisc == NULL) {
+
+		if (ret == NET_XMIT_BYPASS)
+			sch->qstats.drops++;
+		kfree_skb(skb);
+		return ret;
+	}
+#endif
+
+	if ((ret = qdisc->enqueue(skb, qdisc)) == NET_XMIT_SUCCESS) {
+		sch->bstats.bytes += skb->len;
+		sch->bstats.packets++;
+		sch->q.qlen++;
+		return NET_XMIT_SUCCESS;
+	}
+	sch->qstats.drops++;
+	return ret;
+}
+
+
+static int rr_requeue(struct sk_buff *skb, struct Qdisc* sch)
+{
+	struct Qdisc *qdisc;
+	int ret;
+
+	qdisc = rr_classify(skb, sch, &ret);
+#ifdef CONFIG_NET_CLS_ACT
+	if (qdisc == NULL) {
+		if (ret == NET_XMIT_BYPASS)
+			sch->qstats.drops++;
+		kfree_skb(skb);
+		return ret;
+	}
+#endif
+
+	if ((ret = qdisc->ops->requeue(skb, qdisc)) == NET_XMIT_SUCCESS) {
+		sch->q.qlen++;
+		sch->qstats.requeues++;
+		return 0;
+	}
+	sch->qstats.drops++;
+	return NET_XMIT_DROP;
+}
+
+
+static struct sk_buff *rr_dequeue(struct Qdisc* sch)
+{
+	struct sk_buff *skb;
+	struct rr_sched_data *q = qdisc_priv(sch);
+	struct Qdisc *qdisc;
+	int bandcount;
+
+	/* Only take one pass through the queues.  If nothing is available,
+	 * return nothing.
+	 */
+	for (bandcount = 0; bandcount < q->bands; bandcount++) {
+		/* Check if the target subqueue is available before
+		 * pulling an skb.  This way we avoid excessive requeues
+		 * for slower queues.  If the queue is stopped, try the
+		 * next queue.
+		 */
+		if (!netif_subqueue_stopped(sch->dev, q->band2queue[q->curband])) {
+			qdisc = q->queues[q->curband];
+			skb = qdisc->dequeue(qdisc);
+			if (skb) {
+				sch->q.qlen--;
+				q->curband++;
+				if (q->curband >= q->bands)
+					q->curband = 0;
+				return skb;
+			}
+		}
+		q->curband++;
+		if (q->curband >= q->bands)
+			q->curband = 0;
+	}
+	return NULL;
+}
+
+static unsigned int rr_drop(struct Qdisc* sch)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	int band;
+	unsigned int len;
+	struct Qdisc *qdisc;
+
+	for (band = q->bands - 1; band >= 0; band--) {
+		qdisc = q->queues[band];
+		if (qdisc->ops->drop && (len = qdisc->ops->drop(qdisc)) != 0) {
+			sch->q.qlen--;
+			return len;
+		}
+	}
+	return 0;
+}
+
+
+static void rr_reset(struct Qdisc* sch)
+{
+	int band;
+	struct rr_sched_data *q = qdisc_priv(sch);
+
+	for (band = 0; band < q->bands; band++)
+		qdisc_reset(q->queues[band]);
+	sch->q.qlen = 0;
+}
+
+static void rr_destroy(struct Qdisc* sch)
+{
+	int band;
+	struct rr_sched_data *q = qdisc_priv(sch);
+
+	tcf_destroy_chain(q->filter_list);
+	for (band = 0; band < q->bands; band++)
+		qdisc_destroy(q->queues[band]);
+}
+
+static int rr_tune(struct Qdisc *sch, struct rtattr *opt)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	struct tc_rr_qopt *qopt = RTA_DATA(opt);
+	int i;
+	int queue;
+	int qmapoffset;
+	int offset;
+	int mod;
+
+	if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
+		return -EINVAL;
+	if (qopt->bands > TCQ_RR_BANDS || qopt->bands < 2)
+		return -EINVAL;
+
+	for (i = 0; i <= TC_RR_MAX; i++) {
+		if (qopt->priomap[i] >= qopt->bands)
+			return -EINVAL;
+	}
+
+	sch_tree_lock(sch);
+	q->bands = qopt->bands;
+	memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1);
+	q->curband = 0;
+
+	for (i = q->bands; i < TCQ_RR_BANDS; i++) {
+		struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
+		if (child != &noop_qdisc) {
+			qdisc_tree_decrease_qlen(child, child->q.qlen);
+			qdisc_destroy(child);
+		}
+	}
+	sch_tree_unlock(sch);
+
+	for (i = 0; i < q->bands; i++) {
+		if (q->queues[i] == &noop_qdisc) {
+			struct Qdisc *child;
+			child = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
+						  TC_H_MAKE(sch->handle, i + 1));
+			if (child) {
+				sch_tree_lock(sch);
+				child = xchg(&q->queues[i], child);
+
+				if (child != &noop_qdisc) {
+					qdisc_tree_decrease_qlen(child,
+								 child->q.qlen);
+					qdisc_destroy(child);
+				}
+				sch_tree_unlock(sch);
+			}
+		}
+	}
+	/* setup queue to band mapping - best effort to map into available
+	 * hardware queues
+	 */
+	if (q->bands < sch->dev->egress_subqueue_count) {
+		qmapoffset = 1;
+		mod = sch->dev->egress_subqueue_count;
+	} else {
+		mod = q->bands % sch->dev->egress_subqueue_count;
+		qmapoffset = q->bands / sch->dev->egress_subqueue_count
+				+ ((mod) ? 1 : 0);
+	}
+
+	queue = 0;
+	offset = 0;
+	for (i = 0; i < q->bands; i++) {
+		q->band2queue[i] = queue;
+		if ( ((i + 1) - offset) == qmapoffset) {
+			queue++;
+			offset += qmapoffset;
+			if (mod)
+				mod--;
+			qmapoffset = q->bands /
+				sch->dev->egress_subqueue_count +
+				((mod) ? 1 : 0);
+		}
+	}
+
+	return 0;
+}
+
+static int rr_init(struct Qdisc *sch, struct rtattr *opt)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	int i;
+
+	for (i = 0; i < TCQ_RR_BANDS; i++)
+		q->queues[i] = &noop_qdisc;
+
+	if (opt == NULL) {
+		return -EINVAL;
+	} else {
+		int err;
+
+		if ((err = rr_tune(sch, opt)) != 0)
+			return err;
+	}
+	return 0;
+}
+
+static int rr_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	unsigned char *b = skb_tail_pointer(skb);
+	struct tc_rr_qopt opt;
+
+	opt.bands = q->bands;
+	memcpy(&opt.priomap, q->prio2band, TC_RR_MAX + 1);
+	RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
+	return skb->len;
+
+rtattr_failure:
+	nlmsg_trim(skb, b);
+	return -1;
+}
+
+static int rr_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
+		    struct Qdisc **old)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	unsigned long band = arg - 1;
+
+	if (band >= q->bands)
+		return -EINVAL;
+
+	if (new == NULL)
+		new = &noop_qdisc;
+
+	sch_tree_lock(sch);
+	*old = q->queues[band];
+	q->queues[band] = new;
+	qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+	qdisc_reset(*old);
+	sch_tree_unlock(sch);
+
+	return 0;
+}
+
+static struct Qdisc *rr_leaf(struct Qdisc *sch, unsigned long arg)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	unsigned long band = arg - 1;
+
+	if (band >= q->bands)
+		return NULL;
+
+	return q->queues[band];
+}
+
+static unsigned long rr_get(struct Qdisc *sch, u32 classid)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	unsigned long band = TC_H_MIN(classid);
+
+	if (band - 1 >= q->bands)
+		return 0;
+	return band;
+}
+
+static unsigned long rr_bind(struct Qdisc *sch, unsigned long parent,
+			     u32 classid)
+{
+	return rr_get(sch, classid);
+}
+
+
+static void rr_put(struct Qdisc *q, unsigned long cl)
+{
+	return;
+}
+
+static int rr_change(struct Qdisc *sch, u32 handle, u32 parent,
+		     struct rtattr **tca, unsigned long *arg)
+{
+	unsigned long cl = *arg;
+	struct rr_sched_data *q = qdisc_priv(sch);
+
+	if (cl - 1 > q->bands)
+		return -ENOENT;
+	return 0;
+}
+
+static int rr_delete(struct Qdisc *sch, unsigned long cl)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	if (cl - 1 > q->bands)
+		return -ENOENT;
+	return 0;
+}
+
+
+static int rr_dump_class(struct Qdisc *sch, unsigned long cl,
+			 struct sk_buff *skb, struct tcmsg *tcm)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+
+	if (cl - 1 > q->bands)
+		return -ENOENT;
+	tcm->tcm_handle |= TC_H_MIN(cl);
+	if (q->queues[cl - 1])
+		tcm->tcm_info = q->queues[cl - 1]->handle;
+	return 0;
+}
+
+static int rr_dump_class_stats(struct Qdisc *sch, unsigned long cl,
+			       struct gnet_dump *d)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	struct Qdisc *cl_q;
+
+	cl_q = q->queues[cl - 1];
+	if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 ||
+	    gnet_stats_copy_queue(d, &cl_q->qstats) < 0)
+		return -1;
+
+	return 0;
+}
+
+static void rr_walk(struct Qdisc *sch, struct qdisc_walker *arg)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+	int band;
+
+	if (arg->stop)
+		return;
+
+	for (band = 0; band < q->bands; band++) {
+		if (arg->count < arg->skip) {
+			arg->count++;
+			continue;
+		}
+		if (arg->fn(sch, band + 1, arg) < 0) {
+			arg->stop = 1;
+			break;
+		}
+		arg->count++;
+	}
+}
+
+static struct tcf_proto **rr_find_tcf(struct Qdisc *sch, unsigned long cl)
+{
+	struct rr_sched_data *q = qdisc_priv(sch);
+
+	if (cl)
+		return NULL;
+	return &q->filter_list;
+}
+
+static struct Qdisc_class_ops rr_class_ops = {
+	.graft		=	rr_graft,
+	.leaf		=	rr_leaf,
+	.get		=	rr_get,
+	.put		=	rr_put,
+	.change		=	rr_change,
+	.delete		=	rr_delete,
+	.walk		=	rr_walk,
+	.tcf_chain	=	rr_find_tcf,
+	.bind_tcf	=	rr_bind,
+	.unbind_tcf	=	rr_put,
+	.dump		=	rr_dump_class,
+	.dump_stats	=	rr_dump_class_stats,
+};
+
+static struct Qdisc_ops rr_qdisc_ops = {
+	.next		=	NULL,
+	.cl_ops		=	&rr_class_ops,
+	.id		=	"rr",
+	.priv_size	=	sizeof(struct rr_sched_data),
+	.enqueue	=	rr_enqueue,
+	.dequeue	=	rr_dequeue,
+	.requeue	=	rr_requeue,
+	.drop		=	rr_drop,
+	.init		=	rr_init,
+	.reset		=	rr_reset,
+	.destroy	=	rr_destroy,
+	.change		=	rr_tune,
+	.dump		=	rr_dump,
+	.owner		=	THIS_MODULE,
+};
+
+static int __init rr_module_init(void)
+{
+	return register_qdisc(&rr_qdisc_ops);
+}
+
+static void __exit rr_module_exit(void)
+{
+	unregister_qdisc(&rr_qdisc_ops);
+}
+
+module_init(rr_module_init)
+module_exit(rr_module_exit)
+
+MODULE_LICENSE("GPL");
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