Author: pluto Date: Wed Nov 2 11:15:48 2005 GMT
Module: SOURCES Tag: LINUX_2_6
---- Log message:
- this release has a few new features. In brief, there is now hashing
by fwmark and a new "direct" hashing method that eliminates collisions
when the range of input values is smaller than the size of the hash table.
see the expanded, updated http://fatooh.org/esfq-2.6/current/README
for information on the new features, scroll down to the "HASH TYPES"
and "EXAMPLES" sections.
---- Files affected:
SOURCES:
esfq-kernel.patch (NONE -> 1.1.2.1) (NEW)
---- Diffs:
================================================================
Index: SOURCES/esfq-kernel.patch
diff -u /dev/null SOURCES/esfq-kernel.patch:1.1.2.1
--- /dev/null Wed Nov 2 12:15:48 2005
+++ SOURCES/esfq-kernel.patch Wed Nov 2 12:15:43 2005
@@ -0,0 +1,725 @@
+diff -Naur linux-2.6.13.3.old/include/linux/pkt_sched.h
linux-2.6.13.3/include/linux/pkt_sched.h
+--- linux-2.6.13.3.old/include/linux/pkt_sched.h 2005-10-23
17:39:16.000000000 -0700
++++ linux-2.6.13.3/include/linux/pkt_sched.h 2005-10-21 18:13:37.000000000
-0700
+@@ -145,8 +145,35 @@
+ *
+ * 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,
++ TCA_SFQ_HASH_FWMARK,
++ /* direct */
++ TCA_SFQ_HASH_DSTDIR,
++ TCA_SFQ_HASH_SRCDIR,
++ TCA_SFQ_HASH_FWMARKDIR,
++};
++
++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 -Naur linux-2.6.13.3.old/net/sched/Kconfig
linux-2.6.13.3/net/sched/Kconfig
+--- linux-2.6.13.3.old/net/sched/Kconfig 2005-10-23 17:39:16.000000000
-0700
++++ linux-2.6.13.3/net/sched/Kconfig 2005-10-09 16:56:27.000000000 -0700
+@@ -191,6 +191,28 @@
+ To compile this code as a module, choose M here: the
+ module will be called sch_sfq.
+
++config NET_SCH_ESFQ
++ tristate "ESFQ queue"
++ depends on NET_SCHED
++ ---help---
++ Say Y here if you want to use the Enhanced Stochastic Fairness
++ Queueing (ESFQ) packet scheduling algorithm for some of your network
++ devices or as a leaf discipline for a classful qdisc such as HTB or
++ CBQ (see the top of <file:net/sched/sch_esfq.c> for details and
++ references to the SFQ algorithm).
++
++ This is an enchanced SFQ version which allows you to control some
++ hardcoded values in the SFQ scheduler: queue depth, hash table size,
++ and queues limit.
++
++ ESFQ also adds control to the hash function used to identify packet
++ flows. The original SFQ hashes by individual flow (TCP session or UDP
++ stream); ESFQ can hash by src or dst IP as well, which can be more
++ fair to users in some networking situations.
++
++ To compile this code as a module, choose M here: the
++ module will be called sch_esfq.
++
+ config NET_SCH_TEQL
+ tristate "TEQL queue"
+ depends on NET_SCHED
+diff -Naur linux-2.6.13.3.old/net/sched/Makefile
linux-2.6.13.3/net/sched/Makefile
+--- linux-2.6.13.3.old/net/sched/Makefile 2005-10-23 17:39:16.000000000
-0700
++++ linux-2.6.13.3/net/sched/Makefile 2005-10-09 16:56:27.000000000 -0700
+@@ -23,6 +23,7 @@
+ obj-$(CONFIG_NET_SCH_INGRESS) += sch_ingress.o
+ obj-$(CONFIG_NET_SCH_DSMARK) += sch_dsmark.o
+ obj-$(CONFIG_NET_SCH_SFQ) += sch_sfq.o
++obj-$(CONFIG_NET_SCH_ESFQ) += sch_esfq.o
+ obj-$(CONFIG_NET_SCH_TBF) += sch_tbf.o
+ obj-$(CONFIG_NET_SCH_TEQL) += sch_teql.o
+ obj-$(CONFIG_NET_SCH_PRIO) += sch_prio.o
+diff -Naur linux-2.6.13.3.old/net/sched/sch_esfq.c
linux-2.6.13.3/net/sched/sch_esfq.c
+--- linux-2.6.13.3.old/net/sched/sch_esfq.c 1969-12-31 16:00:00.000000000
-0800
++++ linux-2.6.13.3/net/sched/sch_esfq.c 2005-10-23 17:32:19.000000000
-0700
+@@ -0,0 +1,639 @@
++/*
++ * 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, <[EMAIL PROTECTED]>
++ *
++ * Changes: Alexander Atanasov, <[EMAIL PROTECTED]>
++ * Added dynamic depth,limit,divisor,hash_kind options.
++ * Added dst and src hashes.
++ *
++ * Alexander Clouter, <[EMAIL PROTECTED]>
++ * Ported ESFQ to Linux 2.6.
++ *
++ * Corey Hickey, <[EMAIL PROTECTED]>
++ * Maintenance of the Linux 2.6 port.
++ * Added fwmark hash (thanks to Robert Kurjata)
++ * Added direct hashing for src, dst, and fwmark.
++ *
++ */
++
++#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/jiffies.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 <linux/ipv6.h>
++#include <net/route.h>
++#include <linux/skbuff.h>
++#include <net/sock.h>
++#include <net/pkt_sched.h>
++
++
++/* 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 7 hash types.
++
++ classic: same as in sch_sfq.c
++ dst: destination IP address
++ src: source IP address
++ fwmark: netfilter mark value
++ dst_direct:
++ src_direct:
++ fwmark_direct: direct hashing of the above sources
++
++ TODO:
++ make sfq_change work.
++*/
++
++
++/* 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 */
++};
++
++static __inline__ unsigned esfq_hash_u32(struct esfq_sched_data *q,u32 h)
++{
++ int pert = q->perturbation;
++
++ if (pert)
++ h = (h<<pert) ^ (h>>(0x1F - pert));
++
++ h = ntohl(h) * 2654435761UL;
++ return h & (q->hash_divisor-1);
++}
++
++/* Hash input values directly into the "nearest" slot, taking into account the
++ * range of input values seen. This is most useful when the hash table is at
++ * least as large as the range of possible values. */
++static __inline__ unsigned esfq_hash_direct(struct esfq_sched_data *q, u32 h)
++{
++ /* adjust minimum and maximum */
++ if (h < q->dyn_min || h > q->dyn_max) {
++ q->dyn_min = h < q->dyn_min ? h : q->dyn_min;
++ q->dyn_max = h > q->dyn_max ? h : q->dyn_max;
++
++ /* find new range */
++ if ((q->dyn_range = q->dyn_max - q->dyn_min) >= q->hash_divisor)
++ printk(KERN_WARNING "ESFQ: (direct hash) Input range %u
is larger than hash "
++ "table. See ESFQ README for
details.\n", q->dyn_range);
++ }
++
++ /* hash input values into slot numbers */
++ if (q->dyn_min == q->dyn_max)
++ return 0; /* only one value seen; avoid division by 0 */
++ else
++ return (h - q->dyn_min) * (q->hash_divisor - 1) / q->dyn_range;
++}
++
++static __inline__ unsigned esfq_fold_hash_classic(struct esfq_sched_data *q,
u32 h, u32 h1)
++{
++ int pert = q->perturbation;
++
++ /* Have we any rotation primitives? If not, WHY? */
++ h ^= (h1<<pert) ^ (h1>>(0x1F - pert));
++ h ^= h>>10;
++ return h & (q->hash_divisor-1);
++}
++
++static unsigned esfq_hash(struct esfq_sched_data *q, struct sk_buff *skb)
++{
++ u32 h, h2;
++ u32 hs;
++ u32 nfm;
++
++ switch (skb->protocol) {
++ case __constant_htons(ETH_P_IP):
++ {
++ struct iphdr *iph = skb->nh.iph;
++ h = iph->daddr;
++ hs = iph->saddr;
++ nfm = skb->nfmark;
++ h2 = hs^iph->protocol;
++ if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) &&
++ (iph->protocol == IPPROTO_TCP ||
++ iph->protocol == IPPROTO_UDP ||
++ iph->protocol == IPPROTO_ESP))
++ h2 ^= *(((u32*)iph) + iph->ihl);
++ break;
++ }
++ case __constant_htons(ETH_P_IPV6):
++ {
++ struct ipv6hdr *iph = skb->nh.ipv6h;
++ h = iph->daddr.s6_addr32[3];
++ hs = iph->saddr.s6_addr32[3];
++ nfm = skb->nfmark;
++ h2 = hs^iph->nexthdr;
++ if (iph->nexthdr == IPPROTO_TCP ||
++ iph->nexthdr == IPPROTO_UDP ||
++ iph->nexthdr == IPPROTO_ESP)
++ h2 ^= *(u32*)&iph[1];
++ break;
++ }
++ default:
++ h = (u32)(unsigned long)skb->dst;
++ hs = (u32)(unsigned long)skb->sk;
++ nfm = skb->nfmark;
++ h2 = hs^skb->protocol;
++ }
++ switch(q->hash_kind)
++ {
++ case TCA_SFQ_HASH_CLASSIC:
++ return esfq_fold_hash_classic(q, h, h2);
++ case TCA_SFQ_HASH_DST:
++ return esfq_hash_u32(q,h);
++ case TCA_SFQ_HASH_DSTDIR:
++ return esfq_hash_direct(q, ntohl(h));
++ case TCA_SFQ_HASH_SRC:
++ return esfq_hash_u32(q,hs);
++ case TCA_SFQ_HASH_SRCDIR:
++ return esfq_hash_direct(q, ntohl(hs));
++#ifdef CONFIG_NETFILTER
++ case TCA_SFQ_HASH_FWMARK:
++ return esfq_hash_u32(q,nfm);
++ case TCA_SFQ_HASH_FWMARKDIR:
++ return esfq_hash_direct(q,nfm);
++#endif
++ default:
++ if (net_ratelimit())
++ printk(KERN_WARNING "ESFQ: Unknown hash method. Falling
back to classic.\n");
++ }
++ return esfq_fold_hash_classic(q, h, h2);
++}
++
++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->qstats.drops++;
++ 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->qstats.drops++;
++ 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;
++ }
++ __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->bstats.bytes += skb->len;
++ sch->bstats.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;
++ }
++ __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) {
++ sch->qstats.requeues++;
++ return 0;
++ }
++
++ sch->qstats.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--;
++
++ /* 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 = ~0UL/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;
++
<<Diff was trimmed, longer than 597 lines>>
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