From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 net/sched/sch_fifo.c | 212 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 212 insertions(+)
 create mode 100644 net/sched/sch_fifo.c

(limited to 'net/sched/sch_fifo.c')

diff --git a/net/sched/sch_fifo.c b/net/sched/sch_fifo.c
new file mode 100644
index 00000000000..4888305c96d
--- /dev/null
+++ b/net/sched/sch_fifo.c
@@ -0,0 +1,212 @@
+/*
+ * net/sched/sch_fifo.c	The simplest FIFO queue.
+ *
+ *		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.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#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;
+};
+
+static int
+bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+{
+	struct fifo_sched_data *q = qdisc_priv(sch);
+
+	if (sch->qstats.backlog + skb->len <= q->limit) {
+		__skb_queue_tail(&sch->q, skb);
+		sch->qstats.backlog += skb->len;
+		sch->bstats.bytes += skb->len;
+		sch->bstats.packets++;
+		return 0;
+	}
+	sch->qstats.drops++;
+#ifdef CONFIG_NET_CLS_POLICE
+	if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch))
+#endif
+		kfree_skb(skb);
+	return NET_XMIT_DROP;
+}
+
+static int
+bfifo_requeue(struct sk_buff *skb, struct Qdisc* sch)
+{
+	__skb_queue_head(&sch->q, skb);
+	sch->qstats.backlog += skb->len;
+	sch->qstats.requeues++;
+	return 0;
+}
+
+static struct sk_buff *
+bfifo_dequeue(struct Qdisc* sch)
+{
+	struct sk_buff *skb;
+
+	skb = __skb_dequeue(&sch->q);
+	if (skb)
+		sch->qstats.backlog -= skb->len;
+	return skb;
+}
+
+static unsigned int 
+fifo_drop(struct Qdisc* sch)
+{
+	struct sk_buff *skb;
+
+	skb = __skb_dequeue_tail(&sch->q);
+	if (skb) {
+		unsigned int len = skb->len;
+		sch->qstats.backlog -= len;
+		kfree_skb(skb);
+		return len;
+	}
+	return 0;
+}
+
+static void
+fifo_reset(struct Qdisc* sch)
+{
+	skb_queue_purge(&sch->q);
+	sch->qstats.backlog = 0;
+}
+
+static int
+pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+{
+	struct fifo_sched_data *q = qdisc_priv(sch);
+
+	if (sch->q.qlen < q->limit) {
+		__skb_queue_tail(&sch->q, skb);
+		sch->bstats.bytes += skb->len;
+		sch->bstats.packets++;
+		return 0;
+	}
+	sch->qstats.drops++;
+#ifdef CONFIG_NET_CLS_POLICE
+	if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch))
+#endif
+		kfree_skb(skb);
+	return NET_XMIT_DROP;
+}
+
+static int
+pfifo_requeue(struct sk_buff *skb, struct Qdisc* sch)
+{
+	__skb_queue_head(&sch->q, skb);
+	sch->qstats.requeues++;
+	return 0;
+}
+
+
+static struct sk_buff *
+pfifo_dequeue(struct Qdisc* sch)
+{
+	return __skb_dequeue(&sch->q);
+}
+
+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;
+
+		if (sch->ops == &bfifo_qdisc_ops)
+			q->limit = limit*sch->dev->mtu;
+		else	
+			q->limit = limit;
+	} else {
+		struct tc_fifo_qopt *ctl = RTA_DATA(opt);
+		if (opt->rta_len < RTA_LENGTH(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;
+
+	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,
+	.dequeue	=	pfifo_dequeue,
+	.requeue	=	pfifo_requeue,
+	.drop		=	fifo_drop,
+	.init		=	fifo_init,
+	.reset		=	fifo_reset,
+	.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,
+	.dequeue	=	bfifo_dequeue,
+	.requeue	=	bfifo_requeue,
+	.drop		=	fifo_drop,
+	.init		=	fifo_init,
+	.reset		=	fifo_reset,
+	.destroy	=	NULL,
+	.change		=	fifo_init,
+	.dump		=	fifo_dump,
+	.owner		=	THIS_MODULE,
+};
+
+EXPORT_SYMBOL(bfifo_qdisc_ops);
+EXPORT_SYMBOL(pfifo_qdisc_ops);
-- 
cgit v1.2.3