diff -Naur linux-2.6.15.1.orig/include/linux/pkt_sched.h linux-2.6.15.1/include/linux/pkt_sched.h --- linux-2.6.15.1.orig/include/linux/pkt_sched.h 2006-01-14 22:16:02.000000000 -0800 +++ linux-2.6.15.1/include/linux/pkt_sched.h 2006-01-30 16:02:32.000000000 -0800 @@ -146,8 +146,35 @@ * * 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-2.6.15.1.orig/net/sched/Kconfig linux-2.6.15.1/net/sched/Kconfig --- linux-2.6.15.1.orig/net/sched/Kconfig 2006-01-14 22:16:02.000000000 -0800 +++ linux-2.6.15.1/net/sched/Kconfig 2006-01-30 16:02:32.000000000 -0800 @@ -185,6 +185,28 @@ 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 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 "True Link Equalizer (TEQL)" ---help--- diff -Naur linux-2.6.15.1.orig/net/sched/Makefile linux-2.6.15.1/net/sched/Makefile --- linux-2.6.15.1.orig/net/sched/Makefile 2006-01-14 22:16:02.000000000 -0800 +++ linux-2.6.15.1/net/sched/Makefile 2006-01-30 16:02:32.000000000 -0800 @@ -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-2.6.15.1.orig/net/sched/sch_esfq.c linux-2.6.15.1/net/sched/sch_esfq.c --- linux-2.6.15.1.orig/net/sched/sch_esfq.c 1969-12-31 16:00:00.000000000 -0800 +++ linux-2.6.15.1/net/sched/sch_esfq.c 2006-01-30 16:12:29.000000000 -0800 @@ -0,0 +1,644 @@ +/* + * 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, + * + * Changes: Alexander Atanasov, + * Added dynamic depth,limit,divisor,hash_kind options. + * Added dst and src hashes. + * + * Alexander Clouter, + * Ported ESFQ to Linux 2.6. + * + * Corey Hickey, + * Maintenance of the Linux 2.6 port. + * Added fwmark hash (thanks to Robert Kurjata) + * Added direct hashing for src, dst, and fwmark. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +/* 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<>(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<>(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_SCTP || + iph->protocol == IPPROTO_DCCP || + 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_SCTP || + iph->nexthdr == IPPROTO_DCCP || + 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; + + 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; idepth; 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; idepth; 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, + .owner = THIS_MODULE, +}; + +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");