Really apply the esfq patch

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7623 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 744 insertions, 747 deletions

diff --git a/target/linux/brcm-2.4/config/default b/target/linux/brcm-2.4/config/default
index 504acb66d..ff3d18397 100644
--- a/target/linux/brcm-2.4/config/default
+++ b/target/linux/brcm-2.4/config/default
@@ -182,6 +182,7 @@ CONFIG_MTD_SFLASH=y
 # CONFIG_NETROM is not set
 CONFIG_NET_PCI=y
 # CONFIG_NET_PCMCIA is not set
+CONFIG_NET_SCH_ESFQ=m
 CONFIG_NET_WIRELESS=y
 CONFIG_NEW_IRQ=y
 CONFIG_NEW_TIME_C=y
diff --git a/target/linux/generic-2.4/patches/621-tc_esfq.patch b/target/linux/generic-2.4/patches/621-tc_esfq.patch
index d342042c4..f4b9a6edd 100644
--- a/target/linux/generic-2.4/patches/621-tc_esfq.patch
+++ b/target/linux/generic-2.4/patches/621-tc_esfq.patch
@@ -1,747 +1,743 @@
-diff -urN target.old/linux/generic-2.4/patches/232-esfq_kmod.patch target/linux/generic-2.4/patches/232-esfq_kmod.patch
---- target.old/linux/generic-2.4/patches/232-esfq_kmod.patch	1969-12-31 19:00:00.000000000 -0500
-+++ target/linux/generic-2.4/patches/232-esfq_kmod.patch	2007-06-08 02:35:06.000000000 -0400
-@@ -0,0 +1,743 @@
-+diff -urN linux-2.4.34/Documentation/Configure.help linux-2.4.34/Documentation/Configure.help
-+--- linux-2.4.34/Documentation/Configure.help	2007-05-10 19:37:42.000000000 -0400
-++++ linux-2.4.34/Documentation/Configure.help	2007-05-10 19:49:49.000000000 -0400
-+@@ -11127,6 +11127,24 @@
-+   whenever you want).  If you want to compile it as a module, say M
-+   here and read <file:Documentation/modules.txt>.
-+ 
-++ESFQ queue
-++CONFIG_NET_SCH_ESFQ
-++  Say Y here if you want to use the Stochastic Fairness Queueing (SFQ)
-++  packet scheduling algorithm for some of your network devices or as a
-++  leaf discipline for the CBQ scheduling algorithm (see the top of
-++  <file:net/sched/sch_esfq.c> for details and references about the SFQ
-++  algorithm).
-++
-++  This is an enchanced SFQ version which allows you to control the
-++  hardcoded values in the SFQ scheduler: queue depth, hash table size,
-++  queues limit. Also adds control to the hash function used to identify
-++  packet flows. Hash by src or dst ip and original sfq hash.
-++
-++  This code is also available as a module called sch_esfq.o ( = code
-++  which can be inserted in and removed from the running kernel
-++  whenever you want). If you want to compile it as a module, say M
-++  here and read <file:Documentation/modules.txt>.
-++
-+ CSZ packet scheduler
-+ CONFIG_NET_SCH_CSZ
-+   Say Y here if you want to use the Clark-Shenker-Zhang (CSZ) packet
-+diff -urN linux-2.4.34/include/linux/pkt_sched.h linux-2.4.34/include/linux/pkt_sched.h
-+--- linux-2.4.34/include/linux/pkt_sched.h	2007-05-10 19:38:19.000000000 -0400
-++++ linux-2.4.34/include/linux/pkt_sched.h	2007-05-10 19:53:59.000000000 -0400
-+@@ -173,8 +173,36 @@
-+  *
-+  *	The only reason for this is efficiency, it is possible
-+  *	to change these parameters in compile time.
-++ *
-++ *	If you need to play with these values use esfq instead.
-+  */
-+ 
-++/* ESFQ section */
-++
-++enum
-++{
-++	/* traditional */
-++	TCA_SFQ_HASH_CLASSIC,
-++	TCA_SFQ_HASH_DST,
-++	TCA_SFQ_HASH_SRC,
-++	/* conntrack */
-++	TCA_SFQ_HASH_CTORIGDST,
-++	TCA_SFQ_HASH_CTORIGSRC,
-++	TCA_SFQ_HASH_CTREPLDST,
-++	TCA_SFQ_HASH_CTREPLSRC,
-++	TCA_SFQ_HASH_CTNATCHG,
-++};
-++
-++struct tc_esfq_qopt
-++{
-++	unsigned	quantum;	/* Bytes per round allocated to flow */
-++	int		perturb_period; /* Period of hash perturbation */
-++	__u32		limit;		/* Maximal packets in queue */
-++	unsigned	divisor;	/* Hash divisor  */
-++	unsigned	flows;		/* Maximal number of flows  */
-++	unsigned	hash_kind;	/* Hash function to use for flow identification */
-++};
-++
-+ /* RED section */
-+ 
-+ enum
-+diff -urN linux-2.4.34/net/sched/Config.in linux-2.4.34/net/sched/Config.in
-+--- linux-2.4.34/net/sched/Config.in	2007-05-10 19:38:31.000000000 -0400
-++++ linux-2.4.34/net/sched/Config.in	2007-05-10 19:54:45.000000000 -0400
-+@@ -12,6 +12,7 @@
-+ tristate '  The simplest PRIO pseudoscheduler' CONFIG_NET_SCH_PRIO
-+ tristate '  RED queue' CONFIG_NET_SCH_RED
-+ tristate '  SFQ queue' CONFIG_NET_SCH_SFQ
-++tristate '  ESFQ queue' CONFIG_NET_SCH_ESFQ
-+ tristate '  TEQL queue' CONFIG_NET_SCH_TEQL
-+ tristate '  TBF queue' CONFIG_NET_SCH_TBF
-+ tristate '  GRED queue' CONFIG_NET_SCH_GRED
-+diff -urN linux-2.4.34/net/sched/Makefile linux-2.4.34/net/sched/Makefile
-+--- linux-2.4.34/net/sched/Makefile	2007-05-10 19:38:31.000000000 -0400
-++++ linux-2.4.34/net/sched/Makefile	2007-05-10 19:55:13.000000000 -0400
-+@@ -19,6 +19,7 @@
-+ obj-$(CONFIG_NET_SCH_HFSC)	+= sch_hfsc.o
-+ obj-$(CONFIG_NET_SCH_HTB)	+= sch_htb.o
-+ obj-$(CONFIG_NET_SCH_SFQ)	+= sch_sfq.o
-++obj-$(CONFIG_NET_SCH_ESFQ)	+= sch_esfq.o
-+ obj-$(CONFIG_NET_SCH_RED)	+= sch_red.o
-+ obj-$(CONFIG_NET_SCH_TBF)	+= sch_tbf.o
-+ obj-$(CONFIG_NET_SCH_PRIO)	+= sch_prio.o
-+diff -urN linux-2.4.34/net/sched/sch_esfq.c linux-2.4.34/net/sched/sch_esfq.c
-+--- linux-2.4.34/net/sched/sch_esfq.c	1969-12-31 19:00:00.000000000 -0500
-++++ linux-2.4.34/net/sched/sch_esfq.c	2007-05-10 19:57:15.000000000 -0400
-+@@ -0,0 +1,649 @@
-++/*
-++ * net/sched/sch_esfq.c	Extended Stochastic Fairness Queueing discipline.
-++ *
-++ *		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>
-++ *
-++ * Changes:	Alexander Atanasov, <alex@ssi.bg>
-++ *		Added dynamic depth,limit,divisor,hash_kind options.
-++ *		Added dst and src hashes.
-++ *
-++ * 		Alexander Clouter, <alex@digriz.org.uk>
-++ *		Ported ESFQ to Linux 2.6.
-++ *
-++ * 		Corey Hickey, <bugfood-c@fatooh.org>
-++ *		Maintenance of the Linux 2.6 port.
-++ *		Added fwmark hash (thanks to Robert Kurjata).
-++ *		Added usage of jhash.
-++ *		
-++ */
-++
-++#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 <linux/init.h>
-++#include <net/ip.h>
-++#include <net/route.h>
-++#include <linux/skbuff.h>
-++#include <net/sock.h>
-++#include <net/pkt_sched.h>
-++#include <linux/jhash.h>
-++
-++#define IPPROTO_DCCP 33
-++#define qdisc_priv(q)   ((void *)(q->data))
-++
-++#ifdef CONFIG_IP_NF_CONNTRACK
-++/* #include <net/netfilter/nf_conntrack.h> */
-++#include <linux/netfilter_ipv4/ip_conntrack.h>
-++#endif
-++
-++/*	Stochastic Fairness Queuing algorithm.
-++	For more comments look at sch_sfq.c.
-++	The difference is that you can change limit, depth,
-++	hash table size and choose alternate hash types.
-++	
-++	classic:	same as in sch_sfq.c
-++	dst:		destination IP address
-++	src:		source IP address
-++	ctorigdst:	original destination IP address
-++	ctorigsrc:	original source IP address
-++	ctrepldst:	reply destination IP address
-++	ctreplsrc:	reply source IP 
-++	ctnatchg:	use the address which changed via nat
-++	
-++*/
-++
-++
-++/* This type should contain at least SFQ_DEPTH*2 values */
-++typedef unsigned int esfq_index;
-++
-++struct esfq_head
-++{
-++	esfq_index	next;
-++	esfq_index	prev;
-++};
-++
-++struct esfq_sched_data
-++{
-++/* Parameters */
-++	int		perturb_period;
-++	unsigned	quantum;	/* Allotment per round: MUST BE >= MTU */
-++	int		limit;
-++	unsigned	depth;
-++	unsigned	hash_divisor;
-++	unsigned	hash_kind;
-++/* Variables */
-++	struct timer_list perturb_timer;
-++	int		perturbation;
-++	esfq_index	tail;		/* Index of current slot in round */
-++	esfq_index	max_depth;	/* Maximal depth */
-++
-++	esfq_index	*ht;			/* Hash table */
-++	esfq_index	*next;			/* Active slots link */
-++	short		*allot;			/* Current allotment per slot */
-++	unsigned short	*hash;			/* Hash value indexed by slots */
-++	struct sk_buff_head	*qs;		/* Slot queue */
-++	struct esfq_head	*dep;		/* Linked list of slots, indexed by depth */
-++	unsigned	dyn_min;	/* For dynamic divisor adjustment; minimum value seen */
-++	unsigned	dyn_max;	/*                                 maximum value seen */
-++	unsigned	dyn_range;	/*	        		   saved range */
-++};
-++
-++/* This contains the info we will hash. */
-++struct esfq_packet_info
-++{
-++	u32	proto;		/* protocol or port */
-++	u32	src;		/* source from packet header */
-++	u32	dst;		/* destination from packet header */
-++	u32	ctorigsrc;	/* original source from conntrack */
-++	u32	ctorigdst;	/* original destination from conntrack */
-++	u32	ctreplsrc;	/* reply source from conntrack */
-++	u32	ctrepldst;	/* reply destination from conntrack */
-++};
-++
-++static __inline__ unsigned esfq_jhash_1word(struct esfq_sched_data *q,u32 a)
-++{
-++	return jhash_1word(a, q->perturbation) & (q->hash_divisor-1);
-++}
-++
-++static __inline__ unsigned esfq_jhash_2words(struct esfq_sched_data *q, u32 a, u32 b)
-++{
-++	return jhash_2words(a, b, q->perturbation) & (q->hash_divisor-1);
-++}
-++
-++static __inline__ unsigned esfq_jhash_3words(struct esfq_sched_data *q, u32 a, u32 b, u32 c)
-++{
-++	return jhash_3words(a, b, c, q->perturbation) & (q->hash_divisor-1);
-++}
-++
-++
-++static unsigned esfq_hash(struct esfq_sched_data *q, struct sk_buff *skb)
-++{
-++	struct esfq_packet_info info;
-++#ifdef CONFIG_IP_NF_CONNTRACK
-++	enum ip_conntrack_info ctinfo;
-++	struct ip_conntrack *ct = ip_conntrack_get(skb, &ctinfo);
-++#endif
-++	
-++	switch (skb->protocol) {
-++	case __constant_htons(ETH_P_IP):
-++	{
-++		struct iphdr *iph = skb->nh.iph;
-++		info.dst = iph->daddr;
-++		info.src = iph->saddr;
-++		if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) &&
-++		    (iph->protocol == IPPROTO_TCP ||
-++		     iph->protocol == IPPROTO_UDP ||
-++		     iph->protocol == IPPROTO_SCTP ||
-++		     iph->protocol == IPPROTO_DCCP ||
-++		     iph->protocol == IPPROTO_ESP))
-++			info.proto = *(((u32*)iph) + iph->ihl);
-++		else
-++			info.proto = iph->protocol;
-++		break;
-++	}
-++	default:
-++		info.dst   = (u32)(unsigned long)skb->dst;
-++		info.src   = (u32)(unsigned long)skb->sk;
-++		info.proto = skb->protocol;
-++	}
-++
-++#ifdef CONFIG_IP_NF_CONNTRACK
-++	/* defaults if there is no conntrack info */
-++	info.ctorigsrc = info.src;
-++	info.ctorigdst = info.dst;
-++	info.ctreplsrc = info.dst;
-++	info.ctrepldst = info.src;
-++	/* collect conntrack info */
-++	IP_NF_ASSERT(ct);
-++	if (ct) {
-++		if (skb->protocol == __constant_htons(ETH_P_IP)) {
-++			info.ctorigsrc = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
-++			info.ctorigdst = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
-++			info.ctreplsrc = ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip;
-++			info.ctrepldst = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
-++		}
-++	}
-++#endif
-++
-++	switch(q->hash_kind)
-++	{
-++	case TCA_SFQ_HASH_CLASSIC:
-++		return esfq_jhash_3words(q, info.dst, info.src, info.proto);
-++	case TCA_SFQ_HASH_DST:
-++		return esfq_jhash_1word(q, info.dst);
-++	case TCA_SFQ_HASH_SRC:
-++		return esfq_jhash_1word(q, info.src);
-++#ifdef CONFIG_IP_NF_CONNTRACK
-++	case TCA_SFQ_HASH_CTORIGDST:
-++		return esfq_jhash_1word(q, info.ctorigdst);
-++	case TCA_SFQ_HASH_CTORIGSRC:
-++		return esfq_jhash_1word(q, info.ctorigsrc);
-++	case TCA_SFQ_HASH_CTREPLDST:
-++		return esfq_jhash_1word(q, info.ctrepldst);
-++	case TCA_SFQ_HASH_CTREPLSRC:
-++		return esfq_jhash_1word(q, info.ctreplsrc);
-++	case TCA_SFQ_HASH_CTNATCHG:
-++	{
-++		if (info.ctorigdst == info.ctreplsrc)
-++			return esfq_jhash_1word(q, info.ctorigsrc);
-++		else
-++			return esfq_jhash_1word(q, info.ctreplsrc);
-++	}
-++#endif
-++	default:
-++		if (net_ratelimit())
-++			printk(KERN_WARNING "ESFQ: Unknown hash method. Falling back to classic.\n");
-++	}
-++	return esfq_jhash_3words(q, info.dst, info.src, info.proto);
-++}
-++
-++static inline void esfq_link(struct esfq_sched_data *q, esfq_index x)
-++{
-++	esfq_index p, n;
-++	int d = q->qs[x].qlen + q->depth;
-++
-++	p = d;
-++	n = q->dep[d].next;
-++	q->dep[x].next = n;
-++	q->dep[x].prev = p;
-++	q->dep[p].next = q->dep[n].prev = x;
-++}
-++
-++static inline void esfq_dec(struct esfq_sched_data *q, esfq_index x)
-++{
-++	esfq_index p, n;
-++
-++	n = q->dep[x].next;
-++	p = q->dep[x].prev;
-++	q->dep[p].next = n;
-++	q->dep[n].prev = p;
-++
-++	if (n == p && q->max_depth == q->qs[x].qlen + 1)
-++		q->max_depth--;
-++
-++	esfq_link(q, x);
-++}
-++
-++static inline void esfq_inc(struct esfq_sched_data *q, esfq_index x)
-++{
-++	esfq_index p, n;
-++	int d;
-++
-++	n = q->dep[x].next;
-++	p = q->dep[x].prev;
-++	q->dep[p].next = n;
-++	q->dep[n].prev = p;
-++	d = q->qs[x].qlen;
-++	if (q->max_depth < d)
-++		q->max_depth = d;
-++
-++	esfq_link(q, x);
-++}
-++
-++static unsigned int esfq_drop(struct Qdisc *sch)
-++{
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++	esfq_index d = q->max_depth;
-++	struct sk_buff *skb;
-++	unsigned int len;
-++
-++	/* Queue is full! Find the longest slot and
-++	   drop a packet from it */
-++
-++	if (d > 1) {
-++		esfq_index x = q->dep[d+q->depth].next;
-++		skb = q->qs[x].prev;
-++		len = skb->len;
-++		__skb_unlink(skb, &q->qs[x]);
-++		kfree_skb(skb);
-++		esfq_dec(q, x);
-++		sch->q.qlen--;
-++		sch->stats.drops++;
-++		sch->stats.backlog -= len;
-++		return len;
-++	}
-++
-++	if (d == 1) {
-++		/* It is difficult to believe, but ALL THE SLOTS HAVE LENGTH 1. */
-++		d = q->next[q->tail];
-++		q->next[q->tail] = q->next[d];
-++		q->allot[q->next[d]] += q->quantum;
-++		skb = q->qs[d].prev;
-++		len = skb->len;
-++		__skb_unlink(skb, &q->qs[d]);
-++		kfree_skb(skb);
-++		esfq_dec(q, d);
-++		sch->q.qlen--;
-++		q->ht[q->hash[d]] = q->depth;
-++		sch->stats.drops++;
-++		sch->stats.backlog -= len;
-++		return len;
-++	}
-++
-++	return 0;
-++}
-++
-++static int
-++esfq_enqueue(struct sk_buff *skb, struct Qdisc* sch)
-++{
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++	unsigned hash = esfq_hash(q, skb);
-++	unsigned depth = q->depth;
-++	esfq_index x;
-++
-++	x = q->ht[hash];
-++	if (x == depth) {
-++		q->ht[hash] = x = q->dep[depth].next;
-++		q->hash[x] = hash;
-++	}
-++	sch->stats.backlog += skb->len;
-++	__skb_queue_tail(&q->qs[x], skb);
-++	esfq_inc(q, x);
-++	if (q->qs[x].qlen == 1) {		/* The flow is new */
-++		if (q->tail == depth) {	/* It is the first flow */
-++			q->tail = x;
-++			q->next[x] = x;
-++			q->allot[x] = q->quantum;
-++		} else {
-++			q->next[x] = q->next[q->tail];
-++			q->next[q->tail] = x;
-++			q->tail = x;
-++		}
-++	}
-++	if (++sch->q.qlen < q->limit-1) {
-++		sch->stats.bytes += skb->len;
-++		sch->stats.packets++;
-++		return 0;
-++	}
-++
-++	esfq_drop(sch);
-++	return NET_XMIT_CN;
-++}
-++
-++static int
-++esfq_requeue(struct sk_buff *skb, struct Qdisc* sch)
-++{
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++	unsigned hash = esfq_hash(q, skb);
-++	unsigned depth = q->depth;
-++	esfq_index x;
-++
-++	x = q->ht[hash];
-++	if (x == depth) {
-++		q->ht[hash] = x = q->dep[depth].next;
-++		q->hash[x] = hash;
-++	}
-++	sch->stats.backlog += skb->len;
-++	__skb_queue_head(&q->qs[x], skb);
-++	esfq_inc(q, x);
-++	if (q->qs[x].qlen == 1) {		/* The flow is new */
-++		if (q->tail == depth) {	/* It is the first flow */
-++			q->tail = x;
-++			q->next[x] = x;
-++			q->allot[x] = q->quantum;
-++		} else {
-++			q->next[x] = q->next[q->tail];
-++			q->next[q->tail] = x;
-++			q->tail = x;
-++		}
-++	}
-++	if (++sch->q.qlen < q->limit - 1) {
-++		return 0;
-++	}
-++
-++	sch->stats.drops++;
-++	esfq_drop(sch);
-++	return NET_XMIT_CN;
-++}
-++
-++
-++
-++
-++static struct sk_buff *
-++esfq_dequeue(struct Qdisc* sch)
-++{
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++	struct sk_buff *skb;
-++	unsigned depth = q->depth;
-++	esfq_index a, old_a;
-++
-++	/* No active slots */
-++	if (q->tail == depth)
-++		return NULL;
-++	
-++	a = old_a = q->next[q->tail];
-++	
-++	/* Grab packet */
-++	skb = __skb_dequeue(&q->qs[a]);
-++	esfq_dec(q, a);
-++	sch->q.qlen--;
-++	sch->stats.backlog -= skb->len;
-++	
-++	/* Is the slot empty? */
-++	if (q->qs[a].qlen == 0) {
-++		q->ht[q->hash[a]] = depth;
-++		a = q->next[a];
-++		if (a == old_a) {
-++			q->tail = depth;
-++			return skb;
-++		}
-++		q->next[q->tail] = a;
-++		q->allot[a] += q->quantum;
-++	} else if ((q->allot[a] -= skb->len) <= 0) {
-++		q->tail = a;
-++		a = q->next[a];
-++		q->allot[a] += q->quantum;
-++	}
-++	
-++	return skb;
-++}
-++
-++static void
-++esfq_reset(struct Qdisc* sch)
-++{
-++	struct sk_buff *skb;
-++
-++	while ((skb = esfq_dequeue(sch)) != NULL)
-++		kfree_skb(skb);
-++}
-++
-++static void esfq_perturbation(unsigned long arg)
-++{
-++	struct Qdisc *sch = (struct Qdisc*)arg;
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++
-++	q->perturbation = net_random()&0x1F;
-++
-++	if (q->perturb_period) {
-++		q->perturb_timer.expires = jiffies + q->perturb_period;
-++		add_timer(&q->perturb_timer);
-++	}
-++}
-++
-++static int esfq_change(struct Qdisc *sch, struct rtattr *opt)
-++{
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++	struct tc_esfq_qopt *ctl = RTA_DATA(opt);
-++	int old_perturb = q->perturb_period;
-++	
-++	if (opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
-++		return -EINVAL;
-++	
-++	sch_tree_lock(sch);
-++	q->quantum = ctl->quantum ? : psched_mtu(sch->dev);
-++	q->perturb_period = ctl->perturb_period*HZ;
-++//	q->hash_divisor = ctl->divisor;
-++//	q->tail = q->limit = q->depth = ctl->flows;
-++	
-++	if (ctl->limit)
-++		q->limit = min_t(u32, ctl->limit, q->depth);
-++	
-++	if (ctl->hash_kind) {
-++		q->hash_kind = ctl->hash_kind;
-++		if (q->hash_kind != TCA_SFQ_HASH_CLASSIC)
-++			q->perturb_period = 0;
-++	}
-++	
-++	// is sch_tree_lock enough to do this ?
-++	while (sch->q.qlen >= q->limit-1)
-++		esfq_drop(sch);
-++	
-++	if (old_perturb)
-++		del_timer(&q->perturb_timer);
-++	if (q->perturb_period) {
-++		q->perturb_timer.expires = jiffies + q->perturb_period;
-++		add_timer(&q->perturb_timer);
-++	} else {
-++		q->perturbation = 0;
-++	}
-++	sch_tree_unlock(sch);
-++	return 0;
-++}
-++
-++static int esfq_init(struct Qdisc *sch, struct rtattr *opt)
-++{
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++	struct tc_esfq_qopt *ctl;
-++	esfq_index p = ~0U/2;
-++	int i;
-++	
-++	if (opt && opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
-++		return -EINVAL;
-++
-++	init_timer(&q->perturb_timer);
-++	q->perturb_timer.data = (unsigned long)sch;
-++	q->perturb_timer.function = esfq_perturbation;
-++	q->perturbation = 0;
-++	q->hash_kind = TCA_SFQ_HASH_CLASSIC;
-++	q->max_depth = 0;
-++	q->dyn_min = ~0U; /* maximum value for this type */
-++	q->dyn_max = 0;  /* dyn_min/dyn_max will be set properly upon first packet */
-++	if (opt == NULL) {
-++		q->quantum = psched_mtu(sch->dev);
-++		q->perturb_period = 0;
-++		q->hash_divisor = 1024;
-++		q->tail = q->limit = q->depth = 128;
-++		
-++	} else {
-++		ctl = RTA_DATA(opt);
-++		q->quantum = ctl->quantum ? : psched_mtu(sch->dev);
-++		q->perturb_period = ctl->perturb_period*HZ;
-++		q->hash_divisor = ctl->divisor ? : 1024;
-++		q->tail = q->limit = q->depth = ctl->flows ? : 128;
-++		
-++		if ( q->depth > p - 1 )
-++			return -EINVAL;
-++		
-++		if (ctl->limit)
-++			q->limit = min_t(u32, ctl->limit, q->depth);
-++		
-++		if (ctl->hash_kind) {
-++			q->hash_kind = ctl->hash_kind;
-++		}
-++		
-++		if (q->perturb_period) {
-++			q->perturb_timer.expires = jiffies + q->perturb_period;
-++			add_timer(&q->perturb_timer);
-++		}
-++	}
-++	
-++	q->ht = kmalloc(q->hash_divisor*sizeof(esfq_index), GFP_KERNEL);
-++	if (!q->ht)
-++		goto err_case;
-++		
-++	q->dep = kmalloc((1+q->depth*2)*sizeof(struct esfq_head), GFP_KERNEL);
-++	if (!q->dep)
-++		goto err_case;
-++	q->next = kmalloc(q->depth*sizeof(esfq_index), GFP_KERNEL);
-++	if (!q->next)
-++		goto err_case;
-++	
-++	q->allot = kmalloc(q->depth*sizeof(short), GFP_KERNEL);
-++	if (!q->allot)
-++		goto err_case;
-++	q->hash = kmalloc(q->depth*sizeof(unsigned short), GFP_KERNEL);
-++	if (!q->hash)
-++		goto err_case;
-++	q->qs = kmalloc(q->depth*sizeof(struct sk_buff_head), GFP_KERNEL);
-++	if (!q->qs)
-++		goto err_case;
-++	
-++	for (i=0; i< q->hash_divisor; i++)
-++		q->ht[i] = q->depth;
-++	for (i=0; i<q->depth; i++) {
-++		skb_queue_head_init(&q->qs[i]);
-++		q->dep[i+q->depth].next = i+q->depth;
-++		q->dep[i+q->depth].prev = i+q->depth;
-++	}
-++	
-++	for (i=0; i<q->depth; i++)
-++		esfq_link(q, i);
-++	return 0;
-++err_case:
-++	del_timer(&q->perturb_timer);
-++	if (q->ht)
-++		kfree(q->ht);
-++	if (q->dep)
-++		kfree(q->dep);
-++	if (q->next)
-++		kfree(q->next);
-++	if (q->allot)
-++		kfree(q->allot);
-++	if (q->hash)
-++		kfree(q->hash);
-++	if (q->qs)
-++		kfree(q->qs);
-++	return -ENOBUFS;
-++}
-++
-++static void esfq_destroy(struct Qdisc *sch)
-++{
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++	del_timer(&q->perturb_timer);
-++	if(q->ht)
-++		kfree(q->ht);
-++	if(q->dep)
-++		kfree(q->dep);
-++	if(q->next)
-++		kfree(q->next);
-++	if(q->allot)
-++		kfree(q->allot);
-++	if(q->hash)
-++		kfree(q->hash);
-++	if(q->qs)
-++		kfree(q->qs);
-++}
-++
-++static int esfq_dump(struct Qdisc *sch, struct sk_buff *skb)
-++{
-++	struct esfq_sched_data *q = qdisc_priv(sch);
-++	unsigned char	 *b = skb->tail;
-++	struct tc_esfq_qopt opt;
-++
-++	opt.quantum = q->quantum;
-++	opt.perturb_period = q->perturb_period/HZ;
-++
-++	opt.limit = q->limit;
-++	opt.divisor = q->hash_divisor;
-++	opt.flows = q->depth;
-++	opt.hash_kind = q->hash_kind;
-++
-++	RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
-++
-++	return skb->len;
-++
-++rtattr_failure:
-++	skb_trim(skb, b - skb->data);
-++	return -1;
-++}
-++
-++static struct Qdisc_ops esfq_qdisc_ops =
-++{
-++	.next		=	NULL,
-++	.cl_ops		=	NULL,
-++	.id		=	"esfq",
-++	.priv_size	=	sizeof(struct esfq_sched_data),
-++	.enqueue	=	esfq_enqueue,
-++	.dequeue	=	esfq_dequeue,
-++	.requeue	=	esfq_requeue,
-++	.drop		=	esfq_drop,
-++	.init		=	esfq_init,
-++	.reset		=	esfq_reset,
-++	.destroy	=	esfq_destroy,
-++	.change		=	NULL, /* esfq_change - needs more work */
-++	.dump		=	esfq_dump,
-++};
-++
-++static int __init esfq_module_init(void)
-++{
-++	return register_qdisc(&esfq_qdisc_ops);
-++}
-++static void __exit esfq_module_exit(void) 
-++{
-++	unregister_qdisc(&esfq_qdisc_ops);
-++}
-++module_init(esfq_module_init)
-++module_exit(esfq_module_exit)
-++MODULE_LICENSE("GPL");
+diff -urN linux-2.4.34/Documentation/Configure.help linux-2.4.34/Documentation/Configure.help
+--- linux-2.4.34/Documentation/Configure.help	2007-05-10 19:37:42.000000000 -0400
++++ linux-2.4.34/Documentation/Configure.help	2007-05-10 19:49:49.000000000 -0400
+@@ -11127,6 +11127,24 @@
+   whenever you want).  If you want to compile it as a module, say M
+   here and read <file:Documentation/modules.txt>.
+ 
++ESFQ queue
++CONFIG_NET_SCH_ESFQ
++  Say Y here if you want to use the Stochastic Fairness Queueing (SFQ)
++  packet scheduling algorithm for some of your network devices or as a
++  leaf discipline for the CBQ scheduling algorithm (see the top of
++  <file:net/sched/sch_esfq.c> for details and references about the SFQ
++  algorithm).
++
++  This is an enchanced SFQ version which allows you to control the
++  hardcoded values in the SFQ scheduler: queue depth, hash table size,
++  queues limit. Also adds control to the hash function used to identify
++  packet flows. Hash by src or dst ip and original sfq hash.
++
++  This code is also available as a module called sch_esfq.o ( = code
++  which can be inserted in and removed from the running kernel
++  whenever you want). If you want to compile it as a module, say M
++  here and read <file:Documentation/modules.txt>.
++
+ CSZ packet scheduler
+ CONFIG_NET_SCH_CSZ
+   Say Y here if you want to use the Clark-Shenker-Zhang (CSZ) packet
+diff -urN linux-2.4.34/include/linux/pkt_sched.h linux-2.4.34/include/linux/pkt_sched.h
+--- linux-2.4.34/include/linux/pkt_sched.h	2007-05-10 19:38:19.000000000 -0400
++++ linux-2.4.34/include/linux/pkt_sched.h	2007-05-10 19:53:59.000000000 -0400
+@@ -173,8 +173,36 @@
+  *
+  *	The only reason for this is efficiency, it is possible
+  *	to change these parameters in compile time.
++ *
++ *	If you need to play with these values use esfq instead.
+  */
+ 
++/* ESFQ section */
++
++enum
++{
++	/* traditional */
++	TCA_SFQ_HASH_CLASSIC,
++	TCA_SFQ_HASH_DST,
++	TCA_SFQ_HASH_SRC,
++	/* conntrack */
++	TCA_SFQ_HASH_CTORIGDST,
++	TCA_SFQ_HASH_CTORIGSRC,
++	TCA_SFQ_HASH_CTREPLDST,
++	TCA_SFQ_HASH_CTREPLSRC,
++	TCA_SFQ_HASH_CTNATCHG,
++};
++
++struct tc_esfq_qopt
++{
++	unsigned	quantum;	/* Bytes per round allocated to flow */
++	int		perturb_period; /* Period of hash perturbation */
++	__u32		limit;		/* Maximal packets in queue */
++	unsigned	divisor;	/* Hash divisor  */
++	unsigned	flows;		/* Maximal number of flows  */
++	unsigned	hash_kind;	/* Hash function to use for flow identification */
++};
++
+ /* RED section */
+ 
+ enum
+diff -urN linux-2.4.34/net/sched/Config.in linux-2.4.34/net/sched/Config.in
+--- linux-2.4.34/net/sched/Config.in	2007-05-10 19:38:31.000000000 -0400
++++ linux-2.4.34/net/sched/Config.in	2007-05-10 19:54:45.000000000 -0400
+@@ -12,6 +12,7 @@
+ tristate '  The simplest PRIO pseudoscheduler' CONFIG_NET_SCH_PRIO
+ tristate '  RED queue' CONFIG_NET_SCH_RED
+ tristate '  SFQ queue' CONFIG_NET_SCH_SFQ
++tristate '  ESFQ queue' CONFIG_NET_SCH_ESFQ
+ tristate '  TEQL queue' CONFIG_NET_SCH_TEQL
+ tristate '  TBF queue' CONFIG_NET_SCH_TBF
+ tristate '  GRED queue' CONFIG_NET_SCH_GRED
+diff -urN linux-2.4.34/net/sched/Makefile linux-2.4.34/net/sched/Makefile
+--- linux-2.4.34/net/sched/Makefile	2007-05-10 19:38:31.000000000 -0400
++++ linux-2.4.34/net/sched/Makefile	2007-05-10 19:55:13.000000000 -0400
+@@ -19,6 +19,7 @@
+ obj-$(CONFIG_NET_SCH_HFSC)	+= sch_hfsc.o
+ obj-$(CONFIG_NET_SCH_HTB)	+= sch_htb.o
+ obj-$(CONFIG_NET_SCH_SFQ)	+= sch_sfq.o
++obj-$(CONFIG_NET_SCH_ESFQ)	+= sch_esfq.o
+ obj-$(CONFIG_NET_SCH_RED)	+= sch_red.o
+ obj-$(CONFIG_NET_SCH_TBF)	+= sch_tbf.o
+ obj-$(CONFIG_NET_SCH_PRIO)	+= sch_prio.o
+diff -urN linux-2.4.34/net/sched/sch_esfq.c linux-2.4.34/net/sched/sch_esfq.c
+--- linux-2.4.34/net/sched/sch_esfq.c	1969-12-31 19:00:00.000000000 -0500
++++ linux-2.4.34/net/sched/sch_esfq.c	2007-05-10 19:57:15.000000000 -0400
+@@ -0,0 +1,649 @@
++/*
++ * net/sched/sch_esfq.c	Extended Stochastic Fairness Queueing discipline.
++ *
++ *		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>
++ *
++ * Changes:	Alexander Atanasov, <alex@ssi.bg>
++ *		Added dynamic depth,limit,divisor,hash_kind options.
++ *		Added dst and src hashes.
++ *
++ * 		Alexander Clouter, <alex@digriz.org.uk>
++ *		Ported ESFQ to Linux 2.6.
++ *
++ * 		Corey Hickey, <bugfood-c@fatooh.org>
++ *		Maintenance of the Linux 2.6 port.
++ *		Added fwmark hash (thanks to Robert Kurjata).
++ *		Added usage of jhash.
++ *		
++ */
++
++#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 <linux/init.h>
++#include <net/ip.h>
++#include <net/route.h>
++#include <linux/skbuff.h>
++#include <net/sock.h>
++#include <net/pkt_sched.h>
++#include <linux/jhash.h>
++
++#define IPPROTO_DCCP 33
++#define qdisc_priv(q)   ((void *)(q->data))
++
++#ifdef CONFIG_IP_NF_CONNTRACK
++/* #include <net/netfilter/nf_conntrack.h> */
++#include <linux/netfilter_ipv4/ip_conntrack.h>
++#endif
++
++/*	Stochastic Fairness Queuing algorithm.
++	For more comments look at sch_sfq.c.
++	The difference is that you can change limit, depth,
++	hash table size and choose alternate hash types.
++	
++	classic:	same as in sch_sfq.c
++	dst:		destination IP address
++	src:		source IP address
++	ctorigdst:	original destination IP address
++	ctorigsrc:	original source IP address
++	ctrepldst:	reply destination IP address
++	ctreplsrc:	reply source IP 
++	ctnatchg:	use the address which changed via nat
++	
++*/
++
++
++/* This type should contain at least SFQ_DEPTH*2 values */
++typedef unsigned int esfq_index;
++
++struct esfq_head
++{
++	esfq_index	next;
++	esfq_index	prev;
++};
++
++struct esfq_sched_data
++{
++/* Parameters */
++	int		perturb_period;
++	unsigned	quantum;	/* Allotment per round: MUST BE >= MTU */
++	int		limit;
++	unsigned	depth;
++	unsigned	hash_divisor;
++	unsigned	hash_kind;
++/* Variables */
++	struct timer_list perturb_timer;
++	int		perturbation;
++	esfq_index	tail;		/* Index of current slot in round */
++	esfq_index	max_depth;	/* Maximal depth */
++
++	esfq_index	*ht;			/* Hash table */
++	esfq_index	*next;			/* Active slots link */
++	short		*allot;			/* Current allotment per slot */
++	unsigned short	*hash;			/* Hash value indexed by slots */
++	struct sk_buff_head	*qs;		/* Slot queue */
++	struct esfq_head	*dep;		/* Linked list of slots, indexed by depth */
++	unsigned	dyn_min;	/* For dynamic divisor adjustment; minimum value seen */
++	unsigned	dyn_max;	/*                                 maximum value seen */
++	unsigned	dyn_range;	/*	        		   saved range */
++};
++
++/* This contains the info we will hash. */
++struct esfq_packet_info
++{
++	u32	proto;		/* protocol or port */
++	u32	src;		/* source from packet header */
++	u32	dst;		/* destination from packet header */
++	u32	ctorigsrc;	/* original source from conntrack */
++	u32	ctorigdst;	/* original destination from conntrack */
++	u32	ctreplsrc;	/* reply source from conntrack */
++	u32	ctrepldst;	/* reply destination from conntrack */
++};
++
++static __inline__ unsigned esfq_jhash_1word(struct esfq_sched_data *q,u32 a)
++{
++	return jhash_1word(a, q->perturbation) & (q->hash_divisor-1);
++}
++
++static __inline__ unsigned esfq_jhash_2words(struct esfq_sched_data *q, u32 a, u32 b)
++{
++	return jhash_2words(a, b, q->perturbation) & (q->hash_divisor-1);
++}
++
++static __inline__ unsigned esfq_jhash_3words(struct esfq_sched_data *q, u32 a, u32 b, u32 c)
++{
++	return jhash_3words(a, b, c, q->perturbation) & (q->hash_divisor-1);
++}
++
++
++static unsigned esfq_hash(struct esfq_sched_data *q, struct sk_buff *skb)
++{
++	struct esfq_packet_info info;
++#ifdef CONFIG_IP_NF_CONNTRACK
++	enum ip_conntrack_info ctinfo;
++	struct ip_conntrack *ct = ip_conntrack_get(skb, &ctinfo);
++#endif
++	
++	switch (skb->protocol) {
++	case __constant_htons(ETH_P_IP):
++	{
++		struct iphdr *iph = skb->nh.iph;
++		info.dst = iph->daddr;
++		info.src = iph->saddr;
++		if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) &&
++		    (iph->protocol == IPPROTO_TCP ||
++		     iph->protocol == IPPROTO_UDP ||
++		     iph->protocol == IPPROTO_SCTP ||
++		     iph->protocol == IPPROTO_DCCP ||
++		     iph->protocol == IPPROTO_ESP))
++			info.proto = *(((u32*)iph) + iph->ihl);
++		else
++			info.proto = iph->protocol;
++		break;
++	}
++	default:
++		info.dst   = (u32)(unsigned long)skb->dst;
++		info.src   = (u32)(unsigned long)skb->sk;
++		info.proto = skb->protocol;
++	}
++
++#ifdef CONFIG_IP_NF_CONNTRACK
++	/* defaults if there is no conntrack info */
++	info.ctorigsrc = info.src;
++	info.ctorigdst = info.dst;
++	info.ctreplsrc = info.dst;
++	info.ctrepldst = info.src;
++	/* collect conntrack info */
++	IP_NF_ASSERT(ct);
++	if (ct) {
++		if (skb->protocol == __constant_htons(ETH_P_IP)) {
++			info.ctorigsrc = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
++			info.ctorigdst = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
++			info.ctreplsrc = ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip;
++			info.ctrepldst = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
++		}
++	}
++#endif
++
++	switch(q->hash_kind)
++	{
++	case TCA_SFQ_HASH_CLASSIC:
++		return esfq_jhash_3words(q, info.dst, info.src, info.proto);
++	case TCA_SFQ_HASH_DST:
++		return esfq_jhash_1word(q, info.dst);
++	case TCA_SFQ_HASH_SRC:
++		return esfq_jhash_1word(q, info.src);
++#ifdef CONFIG_IP_NF_CONNTRACK
++	case TCA_SFQ_HASH_CTORIGDST:
++		return esfq_jhash_1word(q, info.ctorigdst);
++	case TCA_SFQ_HASH_CTORIGSRC:
++		return esfq_jhash_1word(q, info.ctorigsrc);
++	case TCA_SFQ_HASH_CTREPLDST:
++		return esfq_jhash_1word(q, info.ctrepldst);
++	case TCA_SFQ_HASH_CTREPLSRC:
++		return esfq_jhash_1word(q, info.ctreplsrc);
++	case TCA_SFQ_HASH_CTNATCHG:
++	{
++		if (info.ctorigdst == info.ctreplsrc)
++			return esfq_jhash_1word(q, info.ctorigsrc);
++		else
++			return esfq_jhash_1word(q, info.ctreplsrc);
++	}
++#endif
++	default:
++		if (net_ratelimit())
++			printk(KERN_WARNING "ESFQ: Unknown hash method. Falling back to classic.\n");
++	}
++	return esfq_jhash_3words(q, info.dst, info.src, info.proto);
++}
++
++static inline void esfq_link(struct esfq_sched_data *q, esfq_index x)
++{
++	esfq_index p, n;
++	int d = q->qs[x].qlen + q->depth;
++
++	p = d;
++	n = q->dep[d].next;
++	q->dep[x].next = n;
++	q->dep[x].prev = p;
++	q->dep[p].next = q->dep[n].prev = x;
++}
++
++static inline void esfq_dec(struct esfq_sched_data *q, esfq_index x)
++{
++	esfq_index p, n;
++
++	n = q->dep[x].next;
++	p = q->dep[x].prev;
++	q->dep[p].next = n;
++	q->dep[n].prev = p;
++
++	if (n == p && q->max_depth == q->qs[x].qlen + 1)
++		q->max_depth--;
++
++	esfq_link(q, x);
++}
++
++static inline void esfq_inc(struct esfq_sched_data *q, esfq_index x)
++{
++	esfq_index p, n;
++	int d;
++
++	n = q->dep[x].next;
++	p = q->dep[x].prev;
++	q->dep[p].next = n;
++	q->dep[n].prev = p;
++	d = q->qs[x].qlen;
++	if (q->max_depth < d)
++		q->max_depth = d;
++
++	esfq_link(q, x);
++}
++
++static unsigned int esfq_drop(struct Qdisc *sch)
++{
++	struct esfq_sched_data *q = qdisc_priv(sch);
++	esfq_index d = q->max_depth;
++	struct sk_buff *skb;
++	unsigned int len;
++
++	/* Queue is full! Find the longest slot and
++	   drop a packet from it */
++
++	if (d > 1) {
++		esfq_index x = q->dep[d+q->depth].next;
++		skb = q->qs[x].prev;
++		len = skb->len;
++		__skb_unlink(skb, &q->qs[x]);
++		kfree_skb(skb);
++		esfq_dec(q, x);
++		sch->q.qlen--;
++		sch->stats.drops++;
++		sch->stats.backlog -= len;
++		return len;
++	}
++
++	if (d == 1) {
++		/* It is difficult to believe, but ALL THE SLOTS HAVE LENGTH 1. */
++		d = q->next[q->tail];
++		q->next[q->tail] = q->next[d];
++		q->allot[q->next[d]] += q->quantum;
++		skb = q->qs[d].prev;
++		len = skb->len;
++		__skb_unlink(skb, &q->qs[d]);
++		kfree_skb(skb);
++		esfq_dec(q, d);
++		sch->q.qlen--;
++		q->ht[q->hash[d]] = q->depth;
++		sch->stats.drops++;
++		sch->stats.backlog -= len;
++		return len;
++	}
++
++	return 0;
++}
++
++static int
++esfq_enqueue(struct sk_buff *skb, struct Qdisc* sch)
++{
++	struct esfq_sched_data *q = qdisc_priv(sch);
++	unsigned hash = esfq_hash(q, skb);
++	unsigned depth = q->depth;
++	esfq_index x;
++
++	x = q->ht[hash];
++	if (x == depth) {
++		q->ht[hash] = x = q->dep[depth].next;
++		q->hash[x] = hash;
++	}
++	sch->stats.backlog += skb->len;
++	__skb_queue_tail(&q->qs[x], skb);
++	esfq_inc(q, x);
++	if (q->qs[x].qlen == 1) {		/* The flow is new */
++		if (q->tail == depth) {	/* It is the first flow */
++			q->tail = x;
++			q->next[x] = x;
++			q->allot[x] = q->quantum;
++		} else {
++			q->next[x] = q->next[q->tail];
++			q->next[q->tail] = x;
++			q->tail = x;
++		}
++	}
++	if (++sch->q.qlen < q->limit-1) {
++		sch->stats.bytes += skb->len;
++		sch->stats.packets++;
++		return 0;
++	}
++
++	esfq_drop(sch);
++	return NET_XMIT_CN;
++}
++
++static int
++esfq_requeue(struct sk_buff *skb, struct Qdisc* sch)
++{
++	struct esfq_sched_data *q = qdisc_priv(sch);
++	unsigned hash = esfq_hash(q, skb);
++	unsigned depth = q->depth;
++	esfq_index x;
++
++	x = q->ht[hash];
++	if (x == depth) {
++		q->ht[hash] = x = q->dep[depth].next;
++		q->hash[x] = hash;
++	}
++	sch->stats.backlog += skb->len;
++	__skb_queue_head(&q->qs[x], skb);
++	esfq_inc(q, x);
++	if (q->qs[x].qlen == 1) {		/* The flow is new */
++		if (q->tail == depth) {	/* It is the first flow */
++			q->tail = x;
++			q->next[x] = x;
++			q->allot[x] = q->quantum;
++		} else {
++			q->next[x] = q->next[q->tail];
++			q->next[q->tail] = x;
++			q->tail = x;
++		}
++	}
++	if (++sch->q.qlen < q->limit - 1) {
++		return 0;
++	}
++
++	sch->stats.drops++;
++	esfq_drop(sch);
++	return NET_XMIT_CN;
++}
++
++
++
++
++static struct sk_buff *
++esfq_dequeue(struct Qdisc* sch)
++{
++	struct esfq_sched_data *q = qdisc_priv(sch);
++	struct sk_buff *skb;
++	unsigned depth = q->depth;
++	esfq_index a, old_a;
++
++	/* No active slots */
++	if (q->tail == depth)
++		return NULL;
++	
++	a = old_a = q->next[q->tail];
++	
++	/* Grab packet */
++	skb = __skb_dequeue(&q->qs[a]);
++	esfq_dec(q, a);
++	sch->q.qlen--;
++	sch->stats.backlog -= skb->len;
++	
++	/* Is the slot empty? */
++	if (q->qs[a].qlen == 0) {
++		q->ht[q->hash[a]] = depth;
++		a = q->next[a];
++		if (a == old_a) {
++			q->tail = depth;
++			return skb;
++		}
++		q->next[q->tail] = a;
++		q->allot[a] += q->quantum;
++	} else if ((q->allot[a] -= skb->len) <= 0) {
++		q->tail = a;
++		a = q->next[a];
++		q->allot[a] += q->quantum;
++	}
++	
++	return skb;
++}
++
++static void
++esfq_reset(struct Qdisc* sch)
++{
++	struct sk_buff *skb;
++
++	while ((skb = esfq_dequeue(sch)) != NULL)
++		kfree_skb(skb);
++}
++
++static void esfq_perturbation(unsigned long arg)
++{
++	struct Qdisc *sch = (struct Qdisc*)arg;
++	struct esfq_sched_data *q = qdisc_priv(sch);
++
++	q->perturbation = net_random()&0x1F;
++
++	if (q->perturb_period) {
++		q->perturb_timer.expires = jiffies + q->perturb_period;
++		add_timer(&q->perturb_timer);
++	}
++}
++
++static int esfq_change(struct Qdisc *sch, struct rtattr *opt)
++{
++	struct esfq_sched_data *q = qdisc_priv(sch);
++	struct tc_esfq_qopt *ctl = RTA_DATA(opt);
++	int old_perturb = q->perturb_period;
++	
++	if (opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
++		return -EINVAL;
++	
++	sch_tree_lock(sch);
++	q->quantum = ctl->quantum ? : psched_mtu(sch->dev);
++	q->perturb_period = ctl->perturb_period*HZ;
++//	q->hash_divisor = ctl->divisor;
++//	q->tail = q->limit = q->depth = ctl->flows;
++	
++	if (ctl->limit)
++		q->limit = min_t(u32, ctl->limit, q->depth);
++	
++	if (ctl->hash_kind) {
++		q->hash_kind = ctl->hash_kind;
++		if (q->hash_kind != TCA_SFQ_HASH_CLASSIC)
++			q->perturb_period = 0;
++	}
++	
++	// is sch_tree_lock enough to do this ?
++	while (sch->q.qlen >= q->limit-1)
++		esfq_drop(sch);
++	
++	if (old_perturb)
++		del_timer(&q->perturb_timer);
++	if (q->perturb_period) {
++		q->perturb_timer.expires = jiffies + q->perturb_period;
++		add_timer(&q->perturb_timer);
++	} else {
++		q->perturbation = 0;
++	}
++	sch_tree_unlock(sch);
++	return 0;
++}
++
++static int esfq_init(struct Qdisc *sch, struct rtattr *opt)
++{
++	struct esfq_sched_data *q = qdisc_priv(sch);
++	struct tc_esfq_qopt *ctl;
++	esfq_index p = ~0U/2;
++	int i;
++	
++	if (opt && opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
++		return -EINVAL;
++
++	init_timer(&q->perturb_timer);
++	q->perturb_timer.data = (unsigned long)sch;
++	q->perturb_timer.function = esfq_perturbation;
++	q->perturbation = 0;
++	q->hash_kind = TCA_SFQ_HASH_CLASSIC;
++	q->max_depth = 0;
++	q->dyn_min = ~0U; /* maximum value for this type */
++	q->dyn_max = 0;  /* dyn_min/dyn_max will be set properly upon first packet */
++	if (opt == NULL) {
++		q->quantum = psched_mtu(sch->dev);
++		q->perturb_period = 0;
++		q->hash_divisor = 1024;
++		q->tail = q->limit = q->depth = 128;
++		
++	} else {
++		ctl = RTA_DATA(opt);
++		q->quantum = ctl->quantum ? : psched_mtu(sch->dev);
++		q->perturb_period = ctl->perturb_period*HZ;
++		q->hash_divisor = ctl->divisor ? : 1024;
++		q->tail = q->limit = q->depth = ctl->flows ? : 128;
++		
++		if ( q->depth > p - 1 )
++			return -EINVAL;
++		
++		if (ctl->limit)
++			q->limit = min_t(u32, ctl->limit, q->depth);
++		
++		if (ctl->hash_kind) {
++			q->hash_kind = ctl->hash_kind;
++		}
++		
++		if (q->perturb_period) {
++			q->perturb_timer.expires = jiffies + q->perturb_period;
++			add_timer(&q->perturb_timer);
++		}
++	}
++	
++	q->ht = kmalloc(q->hash_divisor*sizeof(esfq_index), GFP_KERNEL);
++	if (!q->ht)
++		goto err_case;
++		
++	q->dep = kmalloc((1+q->depth*2)*sizeof(struct esfq_head), GFP_KERNEL);
++	if (!q->dep)
++		goto err_case;
++	q->next = kmalloc(q->depth*sizeof(esfq_index), GFP_KERNEL);
++	if (!q->next)
++		goto err_case;
++	
++	q->allot = kmalloc(q->depth*sizeof(short), GFP_KERNEL);
++	if (!q->allot)
++		goto err_case;
++	q->hash = kmalloc(q->depth*sizeof(unsigned short), GFP_KERNEL);
++	if (!q->hash)
++		goto err_case;
++	q->qs = kmalloc(q->depth*sizeof(struct sk_buff_head), GFP_KERNEL);
++	if (!q->qs)
++		goto err_case;
++	
++	for (i=0; i< q->hash_divisor; i++)
++		q->ht[i] = q->depth;
++	for (i=0; i<q->depth; i++) {
++		skb_queue_head_init(&q->qs[i]);
++		q->dep[i+q->depth].next = i+q->depth;
++		q->dep[i+q->depth].prev = i+q->depth;
++	}
++	
++	for (i=0; i<q->depth; i++)
++		esfq_link(q, i);
++	return 0;
++err_case:
++	del_timer(&q->perturb_timer);
++	if (q->ht)
++		kfree(q->ht);
++	if (q->dep)
++		kfree(q->dep);
++	if (q->next)
++		kfree(q->next);
++	if (q->allot)
++		kfree(q->allot);
++	if (q->hash)
++		kfree(q->hash);
++	if (q->qs)
++		kfree(q->qs);
++	return -ENOBUFS;
++}
++
++static void esfq_destroy(struct Qdisc *sch)
++{
++	struct esfq_sched_data *q = qdisc_priv(sch);
++	del_timer(&q->perturb_timer);
++	if(q->ht)
++		kfree(q->ht);
++	if(q->dep)
++		kfree(q->dep);
++	if(q->next)
++		kfree(q->next);
++	if(q->allot)
++		kfree(q->allot);
++	if(q->hash)
++		kfree(q->hash);
++	if(q->qs)
++		kfree(q->qs);
++}
++
++static int esfq_dump(struct Qdisc *sch, struct sk_buff *skb)
++{
++	struct esfq_sched_data *q = qdisc_priv(sch);
++	unsigned char	 *b = skb->tail;
++	struct tc_esfq_qopt opt;
++
++	opt.quantum = q->quantum;
++	opt.perturb_period = q->perturb_period/HZ;
++
++	opt.limit = q->limit;
++	opt.divisor = q->hash_divisor;
++	opt.flows = q->depth;
++	opt.hash_kind = q->hash_kind;
++
++	RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
++
++	return skb->len;
++
++rtattr_failure:
++	skb_trim(skb, b - skb->data);
++	return -1;
++}
++
++static struct Qdisc_ops esfq_qdisc_ops =
++{
++	.next		=	NULL,
++	.cl_ops		=	NULL,
++	.id		=	"esfq",
++	.priv_size	=	sizeof(struct esfq_sched_data),
++	.enqueue	=	esfq_enqueue,
++	.dequeue	=	esfq_dequeue,
++	.requeue	=	esfq_requeue,
++	.drop		=	esfq_drop,
++	.init		=	esfq_init,
++	.reset		=	esfq_reset,
++	.destroy	=	esfq_destroy,
++	.change		=	NULL, /* esfq_change - needs more work */
++	.dump		=	esfq_dump,
++};
++
++static int __init esfq_module_init(void)
++{
++	return register_qdisc(&esfq_qdisc_ops);
++}
++static void __exit esfq_module_exit(void) 
++{
++	unregister_qdisc(&esfq_qdisc_ops);
++}
++module_init(esfq_module_init)
++module_exit(esfq_module_exit)
++MODULE_LICENSE("GPL");