[NET SCHED]: Fix queue limits in multiple qdiscs.

net/sched/sch_fifo.c

@@ -47,7 +47,7 @@ bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 {
 	struct fifo_sched_data *q = (struct fifo_sched_data *)sch->data;
 
-	if (sch->stats.backlog <= q->limit) {
+	if (sch->stats.backlog + skb->len <= q->limit) {
 		__skb_queue_tail(&sch->q, skb);
 		sch->stats.backlog += skb->len;
 		sch->stats.bytes += skb->len;
@@ -108,7 +108,7 @@ pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 {
 	struct fifo_sched_data *q = (struct fifo_sched_data *)sch->data;
 
-	if (sch->q.qlen <= q->limit) {
+	if (sch->q.qlen < q->limit) {
 		__skb_queue_tail(&sch->q, skb);
 		sch->stats.bytes += skb->len;
 		sch->stats.packets++;

net/sched/sch_generic.c

@@ -275,7 +275,7 @@ pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc)
 	list = ((struct sk_buff_head*)qdisc->data) +
 		prio2band[skb->priority&TC_PRIO_MAX];
 
-	if (list->qlen <= qdisc->dev->tx_queue_len) {
+	if (list->qlen < qdisc->dev->tx_queue_len) {
 		__skb_queue_tail(list, skb);
 		qdisc->q.qlen++;
 		qdisc->stats.bytes += skb->len;

net/sched/sch_gred.c

@@ -110,7 +110,7 @@ gred_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 	unsigned long	qave=0;	
 	int i=0;
 
-	if (!t->initd && skb_queue_len(&sch->q) <= sch->dev->tx_queue_len) {
+	if (!t->initd && skb_queue_len(&sch->q) < sch->dev->tx_queue_len) {
 		D2PRINTK("NO GRED Queues setup yet! Enqueued anyway\n");
 		goto do_enqueue;
 	}
@@ -175,7 +175,7 @@ gred_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 	if ((q->qave+qave) < q->qth_min) {
 		q->qcount = -1;
 enqueue:
-		if (q->backlog <= q->limit) {
+		if (q->backlog + skb->len <= q->limit) {
 			q->backlog += skb->len;
 do_enqueue:
 			__skb_queue_tail(&sch->q, skb);

net/sched/sch_red.c

@@ -257,7 +257,7 @@ red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 	if (q->qave < q->qth_min) {
 		q->qcount = -1;
 enqueue:
-		if (sch->stats.backlog <= q->limit) {
+		if (sch->stats.backlog + skb->len <= q->limit) {
 			__skb_queue_tail(&sch->q, skb);
 			sch->stats.backlog += skb->len;
 			sch->stats.bytes += skb->len;