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27a7fa73ee
Openwrt/target/linux/generic-2.4/patches/620-tc_esfq.patch
Florian Fainelli 27a7fa73ee Add esfq to iproute2 and 2.4 kernel (#1891) 
SVN-Revision: 7612
2007-06-13 17:33:25 +00:00

748 lines
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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");
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