[PKT_SCHED]: Cleanup fifo qdisc and remove unnecessary code

Removes the skb trimming code which is not needed since we never
touch the skb upon failure. Removes unnecessary includes,
initializers, and simplifies the code a bit.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_fifo.c

@@ -11,39 +11,21 @@
 
 #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>
 
 /* 1 band FIFO pseudo-"scheduler" */
 
 struct fifo_sched_data
 {
-	unsigned limit;
+	u32 limit;
 };
 
-static int
-bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+static int bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 {
 	struct fifo_sched_data *q = qdisc_priv(sch);
 
@@ -53,8 +35,7 @@ bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 	return qdisc_reshape_fail(skb, sch);
 }
 
-static int
-pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 {
 	struct fifo_sched_data *q = qdisc_priv(sch);
 
@@ -69,40 +50,37 @@ static int fifo_init(struct Qdisc *sch, struct rtattr *opt)
 	struct fifo_sched_data *q = qdisc_priv(sch);
 
 	if (opt == NULL) {
-		unsigned int limit = sch->dev->tx_queue_len ? : 1;
+		u32 limit = sch->dev->tx_queue_len ? : 1;
 
 		if (sch->ops == &bfifo_qdisc_ops)
-			q->limit = limit*sch->dev->mtu;
-		else	
+			limit *= sch->dev->mtu;
+
 		q->limit = limit;
 	} else {
 		struct tc_fifo_qopt *ctl = RTA_DATA(opt);
-		if (opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
+
+		if (RTA_PAYLOAD(opt) < sizeof(*ctl))
 			return -EINVAL;
+
 		q->limit = ctl->limit;
 	}
+
 	return 0;
 }
 
 static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
 {
 	struct fifo_sched_data *q = qdisc_priv(sch);
-	unsigned char	 *b = skb->tail;
-	struct tc_fifo_qopt opt;
+	struct tc_fifo_qopt opt = { .limit = q->limit };
 
-	opt.limit = q->limit;
 	RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
-
 	return skb->len;
 
 rtattr_failure:
-	skb_trim(skb, b - skb->data);
 	return -1;
 }
 
 struct Qdisc_ops pfifo_qdisc_ops = {
-	.next		=	NULL,
-	.cl_ops		=	NULL,
 	.id		=	"pfifo",
 	.priv_size	=	sizeof(struct fifo_sched_data),
 	.enqueue	=	pfifo_enqueue,
@@ -111,15 +89,12 @@ struct Qdisc_ops pfifo_qdisc_ops = {
 	.drop		=	qdisc_queue_drop,
 	.init		=	fifo_init,
 	.reset		=	qdisc_reset_queue,
-	.destroy	=	NULL,
 	.change		=	fifo_init,
 	.dump		=	fifo_dump,
 	.owner		=	THIS_MODULE,
 };
 
 struct Qdisc_ops bfifo_qdisc_ops = {
-	.next		=	NULL,
-	.cl_ops		=	NULL,
 	.id		=	"bfifo",
 	.priv_size	=	sizeof(struct fifo_sched_data),
 	.enqueue	=	bfifo_enqueue,
@@ -128,7 +103,6 @@ struct Qdisc_ops bfifo_qdisc_ops = {
 	.drop		=	qdisc_queue_drop,
 	.init		=	fifo_init,
 	.reset		=	qdisc_reset_queue,
-	.destroy	=	NULL,
 	.change		=	fifo_init,
 	.dump		=	fifo_dump,
 	.owner		=	THIS_MODULE,