Okay, here is a 2.4 version.
diff -Nru a/Documentation/Configure.help b/Documentation/Configure.help
--- a/Documentation/Configure.help Fri Mar 19 10:46:19 2004
+++ b/Documentation/Configure.help Fri Mar 19 10:46:19 2004
@@ -10829,6 +10829,14 @@
whenever you want). If you want to compile it as a module, say M
here and read <file:Documentation/modules.txt>.
+Network delay simualtor
+CONFIG_NET_SCH_DELAY
+ Say Y if you want to delay packets by a fixed amount of
+ time. This is often useful to simulate network delay when
+ testing applications or protocols.
+
+ This code is also available as a module called sch_delay.o
+
Ingress Qdisc
CONFIG_NET_SCH_INGRESS
If you say Y here, you will be able to police incoming bandwidth
diff -Nru a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
--- a/include/linux/pkt_sched.h Fri Mar 19 10:46:19 2004
+++ b/include/linux/pkt_sched.h Fri Mar 19 10:46:19 2004
@@ -432,4 +432,11 @@
#define TCA_ATM_MAX TCA_ATM_STATE
+/* Delay section */
+struct tc_dly_qopt
+{
+ __u32 latency;
+ __u32 limit;
+};
+
#endif
diff -Nru a/net/sched/Config.in b/net/sched/Config.in
--- a/net/sched/Config.in Fri Mar 19 10:46:19 2004
+++ b/net/sched/Config.in Fri Mar 19 10:46:19 2004
@@ -15,6 +15,7 @@
tristate ' TEQL queue' CONFIG_NET_SCH_TEQL
tristate ' TBF queue' CONFIG_NET_SCH_TBF
tristate ' GRED queue' CONFIG_NET_SCH_GRED
+tristate ' Network delay simulator' CONFIG_NET_SCH_DELAY
tristate ' Diffserv field marker' CONFIG_NET_SCH_DSMARK
if [ "$CONFIG_NETFILTER" = "y" ]; then
tristate ' Ingress Qdisc' CONFIG_NET_SCH_INGRESS
diff -Nru a/net/sched/Makefile b/net/sched/Makefile
--- a/net/sched/Makefile Fri Mar 19 10:46:19 2004
+++ b/net/sched/Makefile Fri Mar 19 10:46:19 2004
@@ -14,6 +14,7 @@
obj-$(CONFIG_NET_SCH_INGRESS) += sch_ingress.o
obj-$(CONFIG_NET_SCH_CBQ) += sch_cbq.o
obj-$(CONFIG_NET_SCH_CSZ) += sch_csz.o
+obj-$(CONFIG_NET_SCH_DELAY) += sch_delay.o
obj-$(CONFIG_NET_SCH_HPFQ) += sch_hpfq.o
obj-$(CONFIG_NET_SCH_HFSC) += sch_hfsc.o
obj-$(CONFIG_NET_SCH_HTB) += sch_htb.o
diff -Nru a/net/sched/sch_delay.c b/net/sched/sch_delay.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/net/sched/sch_delay.c Fri Mar 19 10:46:19 2004
@@ -0,0 +1,277 @@
+/*
+ * net/sched/sch_delay.c Simple constant delay
+ *
+ * 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: Stephen Hemminger <shemminger@xxxxxxxx>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.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>
+
+/* Network delay simulator
+ This scheduler adds a fixed delay to all packets.
+ Similar to NISTnet and BSD Dummynet.
+
+ It uses byte fifo underneath similar to TBF */
+struct dly_sched_data {
+ u32 latency;
+ u32 limit;
+ struct timer_list timer;
+ struct Qdisc *qdisc;
+};
+
+/* Time stamp put into socket buffer control block */
+struct dly_skb_cb {
+ psched_time_t queuetime;
+};
+
+/* Enqueue packets with underlying discipline (fifo)
+ * but mark them with current time first.
+ */
+static int dly_enqueue(struct sk_buff *skb, struct Qdisc *sch)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+ struct dly_skb_cb *cb = (struct dly_skb_cb *)skb->cb;
+ int ret;
+
+ PSCHED_GET_TIME(cb->queuetime);
+
+ /* Queue to underlying scheduler */
+ ret = q->qdisc->enqueue(skb, q->qdisc);
+ if (ret)
+ sch->stats.drops++;
+ else {
+ sch->q.qlen++;
+ sch->stats.bytes += skb->len;
+ sch->stats.packets++;
+ }
+ return 0;
+}
+
+/* Requeue packets but don't change time stamp */
+static int dly_requeue(struct sk_buff *skb, struct Qdisc *sch)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+ int ret;
+
+ ret = q->qdisc->ops->requeue(skb, q->qdisc);
+ if (ret == 0)
+ sch->q.qlen++;
+ return ret;
+}
+
+static unsigned int dly_drop(struct Qdisc *sch)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+ unsigned int len;
+
+ len = q->qdisc->ops->drop(q->qdisc);
+ if (len) {
+ sch->q.qlen--;
+ sch->stats.drops++;
+ }
+ return len;
+}
+
+/* Dequeue packet.
+ * If packet needs to be held up, then stop the
+ * queue and set timer to wakeup later.
+ */
+static struct sk_buff *dly_dequeue(struct Qdisc *sch)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+ struct sk_buff *skb = q->qdisc->dequeue(q->qdisc);
+
+ if (skb) {
+ struct dly_skb_cb *cb = (struct dly_skb_cb *)skb->cb;
+ psched_time_t now;
+ long diff;
+
+ PSCHED_GET_TIME(now);
+ diff = q->latency - PSCHED_TDIFF(now, cb->queuetime);
+
+ if (diff <= 0) {
+ sch->q.qlen--;
+ sch->flags &= ~TCQ_F_THROTTLED;
+ return skb;
+ }
+
+ if (!netif_queue_stopped(sch->dev)) {
+ long delay = PSCHED_US2JIFFIE(diff);
+ if (delay <= 0)
+ delay = 1;
+ mod_timer(&q->timer, jiffies+delay);
+ }
+
+ if (q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS) {
+ sch->q.qlen--;
+ sch->stats.drops++;
+ }
+ sch->flags |= TCQ_F_THROTTLED;
+ }
+ return NULL;
+}
+
+static void dly_reset(struct Qdisc *sch)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+
+ qdisc_reset(q->qdisc);
+ sch->q.qlen = 0;
+ sch->flags &= ~TCQ_F_THROTTLED;
+ del_timer(&q->timer);
+}
+
+static void dly_timer(unsigned long arg)
+{
+ struct Qdisc *sch = (struct Qdisc *)arg;
+
+ sch->flags &= ~TCQ_F_THROTTLED;
+ netif_schedule(sch->dev);
+}
+
+/* Tell Fifo the new limit. */
+static int change_limit(struct Qdisc *q, u32 limit)
+{
+ struct rtattr *rta;
+ int ret;
+
+ rta = kmalloc(RTA_LENGTH(sizeof(struct tc_fifo_qopt)), GFP_KERNEL);
+ if (!rta)
+ return -ENOMEM;
+
+ rta->rta_type = RTM_NEWQDISC;
+ ((struct tc_fifo_qopt *)RTA_DATA(rta))->limit = limit;
+ ret = q->ops->change(q, rta);
+ kfree(rta);
+
+ return ret;
+}
+
+/* Setup underlying FIFO discipline */
+static int dly_change(struct Qdisc *sch, struct rtattr *opt)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+ struct tc_dly_qopt *qopt = RTA_DATA(opt);
+ int err;
+
+ if (q->qdisc == &noop_qdisc) {
+ struct Qdisc *child
+ = qdisc_create_dflt(sch->dev, &bfifo_qdisc_ops);
+ if (!child)
+ return -EINVAL;
+ q->qdisc = child;
+ }
+
+ err = change_limit(q->qdisc, qopt->limit);
+ if (err) {
+ qdisc_destroy(q->qdisc);
+ q->qdisc = &noop_qdisc;
+ } else {
+ q->latency = qopt->latency;
+ q->limit = qopt->limit;
+ }
+ return err;
+}
+
+static int dly_init(struct Qdisc *sch, struct rtattr *opt)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+ int err;
+
+ if (!opt)
+ return -EINVAL;
+
+ MOD_INC_USE_COUNT;
+
+ init_timer(&q->timer);
+ q->timer.function = dly_timer;
+ q->timer.data = (unsigned long) sch;
+ q->qdisc = &noop_qdisc;
+
+ err = dly_change(sch, opt);
+ if (err)
+ MOD_DEC_USE_COUNT;
+
+ return err;
+}
+
+static void dly_destroy(struct Qdisc *sch)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+
+ del_timer(&q->timer);
+ qdisc_destroy(q->qdisc);
+ q->qdisc = &noop_qdisc;
+
+ MOD_DEC_USE_COUNT;
+}
+
+static int dly_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+ struct dly_sched_data *q = (struct dly_sched_data *)sch->data;
+ unsigned char *b = skb->tail;
+ struct tc_dly_qopt qopt;
+
+ qopt.latency = q->latency;
+ qopt.limit = q->limit;
+
+ RTA_PUT(skb, TCA_OPTIONS, sizeof(qopt), &qopt);
+
+ return skb->len;
+
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+struct Qdisc_ops dly_qdisc_ops = {
+ .id = "delay",
+ .priv_size = sizeof(struct dly_sched_data),
+ .enqueue = dly_enqueue,
+ .dequeue = dly_dequeue,
+ .requeue = dly_requeue,
+ .drop = dly_drop,
+ .init = dly_init,
+ .reset = dly_reset,
+ .destroy = dly_destroy,
+ .change = dly_change,
+ .dump = dly_dump,
+};
+
+#ifdef MODULE
+int init_module(void)
+{
+ return register_qdisc(&dly_qdisc_ops);
+}
+
+void cleanup_module(void)
+{
+ unregister_qdisc(&dly_qdisc_ops);
+}
+#endif
+MODULE_LICENSE("GPL");
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