X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fsched%2Fsch_red.c;h=ee66c5ca80c6909b23281502bb3a29081cdbca12;hb=9f9afec48221fe4a19f84a9341f5b304bf7d7783;hp=0dabcc9091beeea5834257615e9969e7b55bc1ae;hpb=6b31b28a441c9ba33889f88ac1d9451ed9532ada;p=linux-2.6

diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 0dabcc9091..ee66c5ca80 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -9,38 +9,18 @@
  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  *
  * Changes:
- * J Hadi Salim <hadi@nortel.com> 980914:	computation fixes
+ * J Hadi Salim 980914:	computation fixes
  * Alexey Makarenko <makar@phoenix.kharkov.ua> 990814: qave on idle link was calculated incorrectly.
- * J Hadi Salim <hadi@nortelnetworks.com> 980816:  ECN support	
+ * J Hadi Salim 980816:  ECN support
  */
 
-#include <linux/config.h>
 #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/sched.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/sock.h>
 #include <net/pkt_sched.h>
 #include <net/inet_ecn.h>
-#include <net/dsfield.h>
 #include <net/red.h>
 
 
@@ -63,6 +43,7 @@ struct red_sched_data
 	unsigned char		flags;
 	struct red_parms	parms;
 	struct red_stats	stats;
+	struct Qdisc		*qdisc;
 };
 
 static inline int red_use_ecn(struct red_sched_data *q)
@@ -70,12 +51,18 @@ static inline int red_use_ecn(struct red_sched_data *q)
 	return q->flags & TC_RED_ECN;
 }
 
-static int
-red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+static inline int red_use_harddrop(struct red_sched_data *q)
+{
+	return q->flags & TC_RED_HARDDROP;
+}
+
+static int red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 {
 	struct red_sched_data *q = qdisc_priv(sch);
+	struct Qdisc *child = q->qdisc;
+	int ret;
 
-	q->parms.qavg = red_calc_qavg(&q->parms, sch->qstats.backlog);
+	q->parms.qavg = red_calc_qavg(&q->parms, child->qstats.backlog);
 
 	if (red_is_idling(&q->parms))
 		red_end_of_idle_period(&q->parms);
@@ -96,7 +83,8 @@ red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 
 		case RED_HARD_MARK:
 			sch->qstats.overlimits++;
-			if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) {
+			if (red_use_harddrop(q) || !red_use_ecn(q) ||
+			    !INET_ECN_set_ce(skb)) {
 				q->stats.forced_drop++;
 				goto congestion_drop;
 			}
@@ -105,71 +93,70 @@ red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 			break;
 	}
 
-	if (sch->qstats.backlog + skb->len <= q->limit) {
-		__skb_queue_tail(&sch->q, skb);
-		sch->qstats.backlog += skb->len;
+	ret = child->enqueue(skb, child);
+	if (likely(ret == NET_XMIT_SUCCESS)) {
 		sch->bstats.bytes += skb->len;
 		sch->bstats.packets++;
-		return NET_XMIT_SUCCESS;
+		sch->q.qlen++;
+	} else {
+		q->stats.pdrop++;
+		sch->qstats.drops++;
 	}
-
-	q->stats.pdrop++;
-	kfree_skb(skb);
-	sch->qstats.drops++;
-	return NET_XMIT_DROP;
+	return ret;
 
 congestion_drop:
-	kfree_skb(skb);
-	sch->qstats.drops++;
+	qdisc_drop(skb, sch);
 	return NET_XMIT_CN;
 }
 
-static int
-red_requeue(struct sk_buff *skb, struct Qdisc* sch)
+static int red_requeue(struct sk_buff *skb, struct Qdisc* sch)
 {
 	struct red_sched_data *q = qdisc_priv(sch);
+	struct Qdisc *child = q->qdisc;
+	int ret;
 
 	if (red_is_idling(&q->parms))
 		red_end_of_idle_period(&q->parms);
 
-	__skb_queue_head(&sch->q, skb);
-	sch->qstats.backlog += skb->len;
-	sch->qstats.requeues++;
-	return 0;
+	ret = child->ops->requeue(skb, child);
+	if (likely(ret == NET_XMIT_SUCCESS)) {
+		sch->qstats.requeues++;
+		sch->q.qlen++;
+	}
+	return ret;
 }
 
-static struct sk_buff *
-red_dequeue(struct Qdisc* sch)
+static struct sk_buff * red_dequeue(struct Qdisc* sch)
 {
 	struct sk_buff *skb;
 	struct red_sched_data *q = qdisc_priv(sch);
+	struct Qdisc *child = q->qdisc;
 
-	skb = __skb_dequeue(&sch->q);
-	if (skb) {
-		sch->qstats.backlog -= skb->len;
-		return skb;
-	}
+	skb = child->dequeue(child);
+	if (skb)
+		sch->q.qlen--;
+	else if (!red_is_idling(&q->parms))
+		red_start_of_idle_period(&q->parms);
 
-	red_start_of_idle_period(&q->parms);
-	return NULL;
+	return skb;
 }
 
 static unsigned int red_drop(struct Qdisc* sch)
 {
-	struct sk_buff *skb;
 	struct red_sched_data *q = qdisc_priv(sch);
+	struct Qdisc *child = q->qdisc;
+	unsigned int len;
 
-	skb = __skb_dequeue_tail(&sch->q);
-	if (skb) {
-		unsigned int len = skb->len;
-		sch->qstats.backlog -= len;
-		sch->qstats.drops++;
+	if (child->ops->drop && (len = child->ops->drop(child)) > 0) {
 		q->stats.other++;
-		kfree_skb(skb);
+		sch->qstats.drops++;
+		sch->q.qlen--;
 		return len;
 	}
 
-	red_start_of_idle_period(&q->parms);
+	if (!red_is_idling(&q->parms))
+		red_start_of_idle_period(&q->parms);
+
 	return 0;
 }
 
@@ -177,29 +164,73 @@ static void red_reset(struct Qdisc* sch)
 {
 	struct red_sched_data *q = qdisc_priv(sch);
 
-	__skb_queue_purge(&sch->q);
-	sch->qstats.backlog = 0;
+	qdisc_reset(q->qdisc);
+	sch->q.qlen = 0;
 	red_restart(&q->parms);
 }
 
+static void red_destroy(struct Qdisc *sch)
+{
+	struct red_sched_data *q = qdisc_priv(sch);
+	qdisc_destroy(q->qdisc);
+}
+
+static struct Qdisc *red_create_dflt(struct Qdisc *sch, u32 limit)
+{
+	struct Qdisc *q;
+	struct rtattr *rta;
+	int ret;
+
+	q = qdisc_create_dflt(sch->dev, &bfifo_qdisc_ops,
+			      TC_H_MAKE(sch->handle, 1));
+	if (q) {
+		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);
+
+			if (ret == 0)
+				return q;
+		}
+		qdisc_destroy(q);
+	}
+	return NULL;
+}
+
 static int red_change(struct Qdisc *sch, struct rtattr *opt)
 {
 	struct red_sched_data *q = qdisc_priv(sch);
-	struct rtattr *tb[TCA_RED_STAB];
+	struct rtattr *tb[TCA_RED_MAX];
 	struct tc_red_qopt *ctl;
+	struct Qdisc *child = NULL;
+
+	if (opt == NULL || rtattr_parse_nested(tb, TCA_RED_MAX, opt))
+		return -EINVAL;
 
-	if (opt == NULL ||
-	    rtattr_parse_nested(tb, TCA_RED_STAB, opt) ||
-	    tb[TCA_RED_PARMS-1] == 0 || tb[TCA_RED_STAB-1] == 0 ||
+	if (tb[TCA_RED_PARMS-1] == NULL ||
 	    RTA_PAYLOAD(tb[TCA_RED_PARMS-1]) < sizeof(*ctl) ||
-	    RTA_PAYLOAD(tb[TCA_RED_STAB-1]) < 256)
+	    tb[TCA_RED_STAB-1] == NULL ||
+	    RTA_PAYLOAD(tb[TCA_RED_STAB-1]) < RED_STAB_SIZE)
 		return -EINVAL;
 
 	ctl = RTA_DATA(tb[TCA_RED_PARMS-1]);
 
+	if (ctl->limit > 0) {
+		child = red_create_dflt(sch, ctl->limit);
+		if (child == NULL)
+			return -ENOMEM;
+	}
+
 	sch_tree_lock(sch);
 	q->flags = ctl->flags;
 	q->limit = ctl->limit;
+	if (child)
+		qdisc_destroy(xchg(&q->qdisc, child));
 
 	red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog,
 				 ctl->Plog, ctl->Scell_log,
@@ -207,20 +238,23 @@ static int red_change(struct Qdisc *sch, struct rtattr *opt)
 
 	if (skb_queue_empty(&sch->q))
 		red_end_of_idle_period(&q->parms);
+
 	sch_tree_unlock(sch);
 	return 0;
 }
 
 static int red_init(struct Qdisc* sch, struct rtattr *opt)
 {
+	struct red_sched_data *q = qdisc_priv(sch);
+
+	q->qdisc = &noop_qdisc;
 	return red_change(sch, opt);
 }
 
 static int red_dump(struct Qdisc *sch, struct sk_buff *skb)
 {
 	struct red_sched_data *q = qdisc_priv(sch);
-	unsigned char	 *b = skb->tail;
-	struct rtattr *rta;
+	struct rtattr *opts = NULL;
 	struct tc_red_qopt opt = {
 		.limit		= q->limit,
 		.flags		= q->flags,
@@ -231,16 +265,12 @@ static int red_dump(struct Qdisc *sch, struct sk_buff *skb)
 		.Scell_log	= q->parms.Scell_log,
 	};
 
-	rta = (struct rtattr*)b;
-	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
+	opts = RTA_NEST(skb, TCA_OPTIONS);
 	RTA_PUT(skb, TCA_RED_PARMS, sizeof(opt), &opt);
-	rta->rta_len = skb->tail - b;
-
-	return skb->len;
+	return RTA_NEST_END(skb, opts);
 
 rtattr_failure:
-	skb_trim(skb, b - skb->data);
-	return -1;
+	return RTA_NEST_CANCEL(skb, opts);
 }
 
 static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
@@ -256,17 +286,101 @@ static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
 	return gnet_stats_copy_app(d, &st, sizeof(st));
 }
 
+static int red_dump_class(struct Qdisc *sch, unsigned long cl,
+			  struct sk_buff *skb, struct tcmsg *tcm)
+{
+	struct red_sched_data *q = qdisc_priv(sch);
+
+	if (cl != 1)
+		return -ENOENT;
+	tcm->tcm_handle |= TC_H_MIN(1);
+	tcm->tcm_info = q->qdisc->handle;
+	return 0;
+}
+
+static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
+		     struct Qdisc **old)
+{
+	struct red_sched_data *q = qdisc_priv(sch);
+
+	if (new == NULL)
+		new = &noop_qdisc;
+
+	sch_tree_lock(sch);
+	*old = xchg(&q->qdisc, new);
+	qdisc_reset(*old);
+	sch->q.qlen = 0;
+	sch_tree_unlock(sch);
+	return 0;
+}
+
+static struct Qdisc *red_leaf(struct Qdisc *sch, unsigned long arg)
+{
+	struct red_sched_data *q = qdisc_priv(sch);
+	return q->qdisc;
+}
+
+static unsigned long red_get(struct Qdisc *sch, u32 classid)
+{
+	return 1;
+}
+
+static void red_put(struct Qdisc *sch, unsigned long arg)
+{
+	return;
+}
+
+static int red_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
+			    struct rtattr **tca, unsigned long *arg)
+{
+	return -ENOSYS;
+}
+
+static int red_delete(struct Qdisc *sch, unsigned long cl)
+{
+	return -ENOSYS;
+}
+
+static void red_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 **red_find_tcf(struct Qdisc *sch, unsigned long cl)
+{
+	return NULL;
+}
+
+static struct Qdisc_class_ops red_class_ops = {
+	.graft		=	red_graft,
+	.leaf		=	red_leaf,
+	.get		=	red_get,
+	.put		=	red_put,
+	.change		=	red_change_class,
+	.delete		=	red_delete,
+	.walk		=	red_walk,
+	.tcf_chain	=	red_find_tcf,
+	.dump		=	red_dump_class,
+};
+
 static struct Qdisc_ops red_qdisc_ops = {
-	.next		=	NULL,
-	.cl_ops		=	NULL,
 	.id		=	"red",
 	.priv_size	=	sizeof(struct red_sched_data),
+	.cl_ops		=	&red_class_ops,
 	.enqueue	=	red_enqueue,
 	.dequeue	=	red_dequeue,
 	.requeue	=	red_requeue,
 	.drop		=	red_drop,
 	.init		=	red_init,
 	.reset		=	red_reset,
+	.destroy	=	red_destroy,
 	.change		=	red_change,
 	.dump		=	red_dump,
 	.dump_stats	=	red_dump_stats,
@@ -277,10 +391,13 @@ static int __init red_module_init(void)
 {
 	return register_qdisc(&red_qdisc_ops);
 }
-static void __exit red_module_exit(void) 
+
+static void __exit red_module_exit(void)
 {
 	unregister_qdisc(&red_qdisc_ops);
 }
+
 module_init(red_module_init)
 module_exit(red_module_exit)
+
 MODULE_LICENSE("GPL");