From 6fc8e84f4cf8d623f98aebfd6996dc3848bcf964 Mon Sep 17 00:00:00 2001
From: Thomas Graf <tgraf@suug.ch>
Date: Sat, 18 Jun 2005 22:58:00 -0700
Subject: [PATCH] [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 | 50 +++++++++++---------------------------------
 1 file changed, 12 insertions(+), 38 deletions(-)

diff --git a/net/sched/sch_fifo.c b/net/sched/sch_fifo.c
index 83a4db4d3cd..033083bf0e7 100644
--- a/net/sched/sch_fifo.c
+++ b/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	
-			q->limit = limit;
+			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,
-- 
2.20.1