Add esfq to iproute2 and 2.4 kernel (#1891)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7612 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/iproute2/patches/006-iproute2-tc_esfq.patch b/package/iproute2/patches/006-iproute2-tc_esfq.patch
new file mode 100644 (file)
index 0000000..d034754
--- /dev/null
+++ b/package/iproute2/patches/006-iproute2-tc_esfq.patch
@@ -0,0 +1,295 @@
+diff -urN --exclude=.svn iproute2-2.6.11-050330/include/linux/pkt_sched.h iproute2-2.6.11-050330/include/linux/pkt_sched.h
+--- iproute2-2.6.11-050330/include/linux/pkt_sched.h   2007-05-04 22:21:48.000000000 -0400
++++ iproute2-2.6.11-050330/include/linux/pkt_sched.h   2007-05-04 22:27:12.000000000 -0400
+@@ -174,8 +174,38 @@
+  *
+  *    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
+@@ -551,8 +580,37 @@
+  *
+  *    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 --exclude=.svn iproute2-2.6.11-050330/tc/Makefile iproute2-2.6.11-050330/tc/Makefile
+--- iproute2-2.6.11-050330/tc/Makefile 2007-05-04 22:21:48.000000000 -0400
++++ iproute2-2.6.11-050330/tc/Makefile 2007-05-04 22:27:37.000000000 -0400
+@@ -6,6 +6,7 @@
+ TCMODULES :=
+ TCMODULES += q_fifo.o
+ TCMODULES += q_sfq.o
++TCMODULES += q_esfq.o
+ TCMODULES += q_red.o
+ TCMODULES += q_prio.o
+ TCMODULES += q_tbf.o
+diff -urN --exclude=.svn iproute2-2.6.11-050330/tc/q_esfq.c iproute2-2.6.11-050330/tc/q_esfq.c
+--- iproute2-2.6.11-050330/tc/q_esfq.c 1969-12-31 19:00:00.000000000 -0500
++++ iproute2-2.6.11-050330/tc/q_esfq.c 2007-05-04 22:37:54.000000000 -0400
+@@ -0,0 +1,200 @@
++/*
++ * q_esfq.c           ESFQ.
++ *
++ *            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>
++ *            Alexander Clouter, <alex@digriz.org.uk>
++ *            Corey Hickey, <bugfood-c@fatooh.org>
++ *
++ */
++
++#include <stdio.h>
++#include <stdlib.h>
++#include <unistd.h>
++#include <syslog.h>
++#include <fcntl.h>
++#include <math.h> 
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include <arpa/inet.h>
++#include <string.h>
++
++#include "utils.h"
++#include "tc_util.h"
++
++static void explain(void)
++{
++      fprintf(stderr, "Usage: ... esfq [ perturb SECS ] [ quantum BYTES ] [ depth FLOWS ]\n\t[ divisor HASHBITS ] [ limit PKTS ] [ hash HASHTYPE]\n");
++      fprintf(stderr,"Where: \n");
++      fprintf(stderr,"HASHTYPE := { classic | src | dst | ctorigdst | ctorigsrc | ctrepldst | ctreplsrc | ctnatchg }\n");
++}
++
++#define usage() return(-1)
++
++static int esfq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
++{
++      int ok=0;
++      struct tc_esfq_qopt opt;
++
++      memset(&opt, 0, sizeof(opt));
++
++      opt.hash_kind= TCA_SFQ_HASH_CLASSIC;
++      
++      while (argc > 0) {
++              if (strcmp(*argv, "quantum") == 0) {
++                      NEXT_ARG();
++                      if (get_size(&opt.quantum, *argv)) {
++                              fprintf(stderr, "Illegal \"quantum\"\n");
++                              return -1;
++                      }
++                      ok++;
++              } else if (strcmp(*argv, "perturb") == 0) {
++                      NEXT_ARG();
++                      if (get_integer(&opt.perturb_period, *argv, 0)) {
++                              fprintf(stderr, "Illegal \"perturb\"\n");
++                              return -1;
++                      }
++                      ok++;
++              } else if (strcmp(*argv, "depth") == 0) {
++                      NEXT_ARG();
++                      if (get_integer((int *) &opt.flows, *argv, 0)) {
++                              fprintf(stderr, "Illegal \"depth\"\n");
++                              return -1;
++                      }
++                      ok++;
++              } else if (strcmp(*argv, "divisor") == 0) {
++                      NEXT_ARG();
++                      if (get_integer((int *) &opt.divisor, *argv, 0)) {
++                              fprintf(stderr, "Illegal \"divisor\"\n");
++                              return -1;
++                      }
++                      if(opt.divisor >= 14) {
++                              fprintf(stderr, "Illegal \"divisor\": must be < 14\n");
++                              return -1;
++                      }
++                      opt.divisor=pow(2,opt.divisor);
++                      ok++;
++              } else if (strcmp(*argv, "limit") == 0) {
++                      NEXT_ARG();
++                      if (get_integer((int *) &opt.limit, *argv, 0)) {
++                              fprintf(stderr, "Illegal \"limit\"\n");
++                              return -1;
++                      }
++                      ok++;
++              } else if (strcmp(*argv, "hash") == 0) {
++                      NEXT_ARG();
++                      if(strcmp(*argv, "classic") == 0) {
++                              opt.hash_kind= TCA_SFQ_HASH_CLASSIC;
++                      } else 
++                      if(strcmp(*argv, "dst") == 0) {
++                              opt.hash_kind= TCA_SFQ_HASH_DST;
++                      } else
++                      if(strcmp(*argv, "src") == 0) {
++                              opt.hash_kind= TCA_SFQ_HASH_SRC;
++                      } else
++                      if(strcmp(*argv, "ctorigsrc") == 0) {
++                              opt.hash_kind= TCA_SFQ_HASH_CTORIGSRC;
++                      } else
++                      if(strcmp(*argv, "ctorigdst") == 0) {
++                              opt.hash_kind= TCA_SFQ_HASH_CTORIGDST;
++                      } else
++                      if(strcmp(*argv, "ctreplsrc") == 0) {
++                              opt.hash_kind= TCA_SFQ_HASH_CTREPLSRC;
++                      } else
++                      if(strcmp(*argv, "ctrepldst") == 0) {
++                              opt.hash_kind= TCA_SFQ_HASH_CTREPLDST;
++                      } else
++                      if(strcmp(*argv, "ctnatchg") == 0) {
++                              opt.hash_kind= TCA_SFQ_HASH_CTNATCHG;
++                      } else {
++                              fprintf(stderr, "Illegal \"hash\"\n");
++                              explain();
++                              return -1;
++                      }
++                      ok++;
++              } else if (strcmp(*argv, "help") == 0) {
++                      explain();
++                      return -1;
++              } else {
++                      fprintf(stderr, "What is \"%s\"?\n", *argv);
++                      explain();
++                      return -1;
++              }
++              argc--; argv++;
++      }
++
++      if (ok)
++              addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
++      return 0;
++}
++
++static int esfq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
++{
++      struct tc_esfq_qopt *qopt;
++      SPRINT_BUF(b1);
++
++      if (opt == NULL)
++              return 0;
++
++      if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
++              return -1;
++      qopt = RTA_DATA(opt);
++      fprintf(f, "quantum %s ", sprint_size(qopt->quantum, b1));
++      if (show_details) {
++              fprintf(f, "limit %up flows %u/%u ",
++                      qopt->limit, qopt->flows, qopt->divisor);
++      }
++      if (qopt->perturb_period)
++              fprintf(f, "perturb %dsec ", qopt->perturb_period);
++
++              fprintf(f,"hash: ");
++      switch(qopt->hash_kind)
++      {
++      case TCA_SFQ_HASH_CLASSIC:
++              fprintf(f,"classic");
++              break;
++      case TCA_SFQ_HASH_DST:
++              fprintf(f,"dst");
++              break;
++      case TCA_SFQ_HASH_SRC:
++              fprintf(f,"src");
++              break;
++      case TCA_SFQ_HASH_CTORIGSRC:
++              fprintf(f,"ctorigsrc");
++              break;
++      case TCA_SFQ_HASH_CTORIGDST:
++              fprintf(f,"ctorigdst");
++              break;
++      case TCA_SFQ_HASH_CTREPLSRC:
++              fprintf(f,"ctreplsrc");
++              break;
++      case TCA_SFQ_HASH_CTREPLDST:
++              fprintf(f,"ctrepldst");
++              break;
++      case TCA_SFQ_HASH_CTNATCHG:
++              fprintf(f,"ctnatchg");
++              break;
++      default:
++              fprintf(f,"Unknown");
++      }
++      return 0;
++}
++
++static int esfq_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
++{
++      return 0;
++}
++
++
++struct qdisc_util esfq_qdisc_util = {
++      .id = "esfq",
++      .parse_qopt = esfq_parse_opt,
++      .print_qopt = esfq_print_opt,
++      .print_xstats = esfq_print_xstats,
++};

diff --git a/target/linux/generic-2.4/patches/620-tc_esfq.patch b/target/linux/generic-2.4/patches/620-tc_esfq.patch
new file mode 100644 (file)
index 0000000..d342042
--- /dev/null
+++ b/target/linux/generic-2.4/patches/620-tc_esfq.patch
@@ -0,0 +1,747 @@
+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");