diff options
Diffstat (limited to 'target/linux/generic/patches-3.3')
7 files changed, 1941 insertions, 1 deletions
diff --git a/target/linux/generic/patches-3.3/040-Controlled-Delay-AQM.patch b/target/linux/generic/patches-3.3/040-Controlled-Delay-AQM.patch new file mode 100644 index 0000000000..5848d2fda2 --- /dev/null +++ b/target/linux/generic/patches-3.3/040-Controlled-Delay-AQM.patch @@ -0,0 +1,755 @@ +From 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 Mon Sep 17 00:00:00 2001 +From: Eric Dumazet <edumazet@google.com> +Date: Thu, 10 May 2012 07:51:25 +0000 +Subject: [PATCH 01/41] codel: Controlled Delay AQM + +An implementation of CoDel AQM, from Kathleen Nichols and Van Jacobson. + +http://queue.acm.org/detail.cfm?id=2209336 + +This AQM main input is no longer queue size in bytes or packets, but the +delay packets stay in (FIFO) queue. + +As we don't have infinite memory, we still can drop packets in enqueue() +in case of massive load, but mean of CoDel is to drop packets in +dequeue(), using a control law based on two simple parameters : + +target : target sojourn time (default 5ms) +interval : width of moving time window (default 100ms) + +Based on initial work from Dave Taht. + +Refactored to help future codel inclusion as a plugin for other linux +qdisc (FQ_CODEL, ...), like RED. + +include/net/codel.h contains codel algorithm as close as possible than +Kathleen reference. + +net/sched/sch_codel.c contains the linux qdisc specific glue. + +Separate structures permit a memory efficient implementation of fq_codel +(to be sent as a separate work) : Each flow has its own struct +codel_vars. + +timestamps are taken at enqueue() time with 1024 ns precision, allowing +a range of 2199 seconds in queue, and 100Gb links support. iproute2 uses +usec as base unit. + +Selected packets are dropped, unless ECN is enabled and packets can get +ECN mark instead. + +Tested from 2Mb to 10Gb speeds with no particular problems, on ixgbe and +tg3 drivers (BQL enabled). + +Usage: tc qdisc ... codel [ limit PACKETS ] [ target TIME ] + [ interval TIME ] [ ecn ] + +qdisc codel 10: parent 1:1 limit 2000p target 3.0ms interval 60.0ms ecn + Sent 13347099587 bytes 8815805 pkt (dropped 0, overlimits 0 requeues 0) + rate 202365Kbit 16708pps backlog 113550b 75p requeues 0 + count 116 lastcount 98 ldelay 4.3ms dropping drop_next 816us + maxpacket 1514 ecn_mark 84399 drop_overlimit 0 + +CoDel must be seen as a base module, and should be used keeping in mind +there is still a FIFO queue. So a typical setup will probably need a +hierarchy of several qdiscs and packet classifiers to be able to meet +whatever constraints a user might have. + +One possible example would be to use fq_codel, which combines Fair +Queueing and CoDel, in replacement of sfq / sfq_red. + +Signed-off-by: Eric Dumazet <edumazet@google.com> +Signed-off-by: Dave Taht <dave.taht@bufferbloat.net> +Cc: Kathleen Nichols <nichols@pollere.com> +Cc: Van Jacobson <van@pollere.net> +Cc: Tom Herbert <therbert@google.com> +Cc: Matt Mathis <mattmathis@google.com> +Cc: Yuchung Cheng <ycheng@google.com> +Cc: Stephen Hemminger <shemminger@vyatta.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + include/linux/pkt_sched.h | 26 ++++ + include/net/codel.h | 332 +++++++++++++++++++++++++++++++++++++++++++++ + net/sched/Kconfig | 11 ++ + net/sched/Makefile | 1 + + net/sched/sch_codel.c | 275 +++++++++++++++++++++++++++++++++++++ + 5 files changed, 645 insertions(+) + create mode 100644 include/net/codel.h + create mode 100644 net/sched/sch_codel.c + +--- a/include/linux/pkt_sched.h ++++ b/include/linux/pkt_sched.h +@@ -633,4 +633,30 @@ struct tc_qfq_stats { + __u32 lmax; + }; + ++/* CODEL */ ++ ++enum { ++ TCA_CODEL_UNSPEC, ++ TCA_CODEL_TARGET, ++ TCA_CODEL_LIMIT, ++ TCA_CODEL_INTERVAL, ++ TCA_CODEL_ECN, ++ __TCA_CODEL_MAX ++}; ++ ++#define TCA_CODEL_MAX (__TCA_CODEL_MAX - 1) ++ ++struct tc_codel_xstats { ++ __u32 maxpacket; /* largest packet we've seen so far */ ++ __u32 count; /* how many drops we've done since the last time we ++ * entered dropping state ++ */ ++ __u32 lastcount; /* count at entry to dropping state */ ++ __u32 ldelay; /* in-queue delay seen by most recently dequeued packet */ ++ __s32 drop_next; /* time to drop next packet */ ++ __u32 drop_overlimit; /* number of time max qdisc packet limit was hit */ ++ __u32 ecn_mark; /* number of packets we ECN marked instead of dropped */ ++ __u32 dropping; /* are we in dropping state ? */ ++}; ++ + #endif +--- /dev/null ++++ b/include/net/codel.h +@@ -0,0 +1,332 @@ ++#ifndef __NET_SCHED_CODEL_H ++#define __NET_SCHED_CODEL_H ++ ++/* ++ * Codel - The Controlled-Delay Active Queue Management algorithm ++ * ++ * Copyright (C) 2011-2012 Kathleen Nichols <nichols@pollere.com> ++ * Copyright (C) 2011-2012 Van Jacobson <van@pollere.net> ++ * Copyright (C) 2012 Michael D. Taht <dave.taht@bufferbloat.net> ++ * Copyright (C) 2012 Eric Dumazet <edumazet@google.com> ++ * ++ * Redistribution and use in source and binary forms, with or without ++ * modification, are permitted provided that the following conditions ++ * are met: ++ * 1. Redistributions of source code must retain the above copyright ++ * notice, this list of conditions, and the following disclaimer, ++ * without modification. ++ * 2. Redistributions in binary form must reproduce the above copyright ++ * notice, this list of conditions and the following disclaimer in the ++ * documentation and/or other materials provided with the distribution. ++ * 3. The names of the authors may not be used to endorse or promote products ++ * derived from this software without specific prior written permission. ++ * ++ * Alternatively, provided that this notice is retained in full, this ++ * software may be distributed under the terms of the GNU General ++ * Public License ("GPL") version 2, in which case the provisions of the ++ * GPL apply INSTEAD OF those given above. ++ * ++ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ++ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ++ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ++ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ++ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ++ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ++ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ++ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ++ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ++ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ++ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH ++ * DAMAGE. ++ * ++ */ ++ ++#include <linux/types.h> ++#include <linux/ktime.h> ++#include <linux/skbuff.h> ++#include <net/pkt_sched.h> ++#include <net/inet_ecn.h> ++ ++/* Controlling Queue Delay (CoDel) algorithm ++ * ========================================= ++ * Source : Kathleen Nichols and Van Jacobson ++ * http://queue.acm.org/detail.cfm?id=2209336 ++ * ++ * Implemented on linux by Dave Taht and Eric Dumazet ++ */ ++ ++ ++/* CoDel uses a 1024 nsec clock, encoded in u32 ++ * This gives a range of 2199 seconds, because of signed compares ++ */ ++typedef u32 codel_time_t; ++typedef s32 codel_tdiff_t; ++#define CODEL_SHIFT 10 ++#define MS2TIME(a) ((a * NSEC_PER_MSEC) >> CODEL_SHIFT) ++ ++static inline codel_time_t codel_get_time(void) ++{ ++ u64 ns = ktime_to_ns(ktime_get()); ++ ++ return ns >> CODEL_SHIFT; ++} ++ ++#define codel_time_after(a, b) ((s32)(a) - (s32)(b) > 0) ++#define codel_time_after_eq(a, b) ((s32)(a) - (s32)(b) >= 0) ++#define codel_time_before(a, b) ((s32)(a) - (s32)(b) < 0) ++#define codel_time_before_eq(a, b) ((s32)(a) - (s32)(b) <= 0) ++ ++/* Qdiscs using codel plugin must use codel_skb_cb in their own cb[] */ ++struct codel_skb_cb { ++ codel_time_t enqueue_time; ++}; ++ ++static struct codel_skb_cb *get_codel_cb(const struct sk_buff *skb) ++{ ++ qdisc_cb_private_validate(skb, sizeof(struct codel_skb_cb)); ++ return (struct codel_skb_cb *)qdisc_skb_cb(skb)->data; ++} ++ ++static codel_time_t codel_get_enqueue_time(const struct sk_buff *skb) ++{ ++ return get_codel_cb(skb)->enqueue_time; ++} ++ ++static void codel_set_enqueue_time(struct sk_buff *skb) ++{ ++ get_codel_cb(skb)->enqueue_time = codel_get_time(); ++} ++ ++static inline u32 codel_time_to_us(codel_time_t val) ++{ ++ u64 valns = ((u64)val << CODEL_SHIFT); ++ ++ do_div(valns, NSEC_PER_USEC); ++ return (u32)valns; ++} ++ ++/** ++ * struct codel_params - contains codel parameters ++ * @target: target queue size (in time units) ++ * @interval: width of moving time window ++ * @ecn: is Explicit Congestion Notification enabled ++ */ ++struct codel_params { ++ codel_time_t target; ++ codel_time_t interval; ++ bool ecn; ++}; ++ ++/** ++ * struct codel_vars - contains codel variables ++ * @count: how many drops we've done since the last time we ++ * entered dropping state ++ * @lastcount: count at entry to dropping state ++ * @dropping: set to true if in dropping state ++ * @first_above_time: when we went (or will go) continuously above target ++ * for interval ++ * @drop_next: time to drop next packet, or when we dropped last ++ * @ldelay: sojourn time of last dequeued packet ++ */ ++struct codel_vars { ++ u32 count; ++ u32 lastcount; ++ bool dropping; ++ codel_time_t first_above_time; ++ codel_time_t drop_next; ++ codel_time_t ldelay; ++}; ++ ++/** ++ * struct codel_stats - contains codel shared variables and stats ++ * @maxpacket: largest packet we've seen so far ++ * @drop_count: temp count of dropped packets in dequeue() ++ * ecn_mark: number of packets we ECN marked instead of dropping ++ */ ++struct codel_stats { ++ u32 maxpacket; ++ u32 drop_count; ++ u32 ecn_mark; ++}; ++ ++static void codel_params_init(struct codel_params *params) ++{ ++ params->interval = MS2TIME(100); ++ params->target = MS2TIME(5); ++ params->ecn = false; ++} ++ ++static void codel_vars_init(struct codel_vars *vars) ++{ ++ vars->drop_next = 0; ++ vars->first_above_time = 0; ++ vars->dropping = false; /* exit dropping state */ ++ vars->count = 0; ++ vars->lastcount = 0; ++} ++ ++static void codel_stats_init(struct codel_stats *stats) ++{ ++ stats->maxpacket = 256; ++} ++ ++/* return interval/sqrt(x) with good precision ++ * relies on int_sqrt(unsigned long x) kernel implementation ++ */ ++static u32 codel_inv_sqrt(u32 _interval, u32 _x) ++{ ++ u64 interval = _interval; ++ unsigned long x = _x; ++ ++ /* Scale operands for max precision */ ++ ++#if BITS_PER_LONG == 64 ++ x <<= 32; /* On 64bit arches, we can prescale x by 32bits */ ++ interval <<= 16; ++#endif ++ ++ while (x < (1UL << (BITS_PER_LONG - 2))) { ++ x <<= 2; ++ interval <<= 1; ++ } ++ do_div(interval, int_sqrt(x)); ++ return (u32)interval; ++} ++ ++static codel_time_t codel_control_law(codel_time_t t, ++ codel_time_t interval, ++ u32 count) ++{ ++ return t + codel_inv_sqrt(interval, count); ++} ++ ++ ++static bool codel_should_drop(struct sk_buff *skb, ++ unsigned int *backlog, ++ struct codel_vars *vars, ++ struct codel_params *params, ++ struct codel_stats *stats, ++ codel_time_t now) ++{ ++ bool ok_to_drop; ++ ++ if (!skb) { ++ vars->first_above_time = 0; ++ return false; ++ } ++ ++ vars->ldelay = now - codel_get_enqueue_time(skb); ++ *backlog -= qdisc_pkt_len(skb); ++ ++ if (unlikely(qdisc_pkt_len(skb) > stats->maxpacket)) ++ stats->maxpacket = qdisc_pkt_len(skb); ++ ++ if (codel_time_before(vars->ldelay, params->target) || ++ *backlog <= stats->maxpacket) { ++ /* went below - stay below for at least interval */ ++ vars->first_above_time = 0; ++ return false; ++ } ++ ok_to_drop = false; ++ if (vars->first_above_time == 0) { ++ /* just went above from below. If we stay above ++ * for at least interval we'll say it's ok to drop ++ */ ++ vars->first_above_time = now + params->interval; ++ } else if (codel_time_after(now, vars->first_above_time)) { ++ ok_to_drop = true; ++ } ++ return ok_to_drop; ++} ++ ++typedef struct sk_buff * (*codel_skb_dequeue_t)(struct codel_vars *vars, ++ struct Qdisc *sch); ++ ++static struct sk_buff *codel_dequeue(struct Qdisc *sch, ++ struct codel_params *params, ++ struct codel_vars *vars, ++ struct codel_stats *stats, ++ codel_skb_dequeue_t dequeue_func, ++ u32 *backlog) ++{ ++ struct sk_buff *skb = dequeue_func(vars, sch); ++ codel_time_t now; ++ bool drop; ++ ++ if (!skb) { ++ vars->dropping = false; ++ return skb; ++ } ++ now = codel_get_time(); ++ drop = codel_should_drop(skb, backlog, vars, params, stats, now); ++ if (vars->dropping) { ++ if (!drop) { ++ /* sojourn time below target - leave dropping state */ ++ vars->dropping = false; ++ } else if (codel_time_after_eq(now, vars->drop_next)) { ++ /* It's time for the next drop. Drop the current ++ * packet and dequeue the next. The dequeue might ++ * take us out of dropping state. ++ * If not, schedule the next drop. ++ * A large backlog might result in drop rates so high ++ * that the next drop should happen now, ++ * hence the while loop. ++ */ ++ while (vars->dropping && ++ codel_time_after_eq(now, vars->drop_next)) { ++ if (++vars->count == 0) /* avoid zero divides */ ++ vars->count = ~0U; ++ if (params->ecn && INET_ECN_set_ce(skb)) { ++ stats->ecn_mark++; ++ vars->drop_next = ++ codel_control_law(vars->drop_next, ++ params->interval, ++ vars->count); ++ goto end; ++ } ++ qdisc_drop(skb, sch); ++ stats->drop_count++; ++ skb = dequeue_func(vars, sch); ++ if (!codel_should_drop(skb, backlog, ++ vars, params, stats, now)) { ++ /* leave dropping state */ ++ vars->dropping = false; ++ } else { ++ /* and schedule the next drop */ ++ vars->drop_next = ++ codel_control_law(vars->drop_next, ++ params->interval, ++ vars->count); ++ } ++ } ++ } ++ } else if (drop) { ++ if (params->ecn && INET_ECN_set_ce(skb)) { ++ stats->ecn_mark++; ++ } else { ++ qdisc_drop(skb, sch); ++ stats->drop_count++; ++ ++ skb = dequeue_func(vars, sch); ++ drop = codel_should_drop(skb, backlog, vars, params, ++ stats, now); ++ } ++ vars->dropping = true; ++ /* if min went above target close to when we last went below it ++ * assume that the drop rate that controlled the queue on the ++ * last cycle is a good starting point to control it now. ++ */ ++ if (codel_time_before(now - vars->drop_next, ++ 16 * params->interval)) { ++ vars->count = (vars->count - vars->lastcount) | 1; ++ } else { ++ vars->count = 1; ++ } ++ vars->lastcount = vars->count; ++ vars->drop_next = codel_control_law(now, params->interval, ++ vars->count); ++ } ++end: ++ return skb; ++} ++#endif +--- a/net/sched/Kconfig ++++ b/net/sched/Kconfig +@@ -250,6 +250,17 @@ config NET_SCH_QFQ + + If unsure, say N. + ++config NET_SCH_CODEL ++ tristate "Controlled Delay AQM (CODEL)" ++ help ++ Say Y here if you want to use the Controlled Delay (CODEL) ++ packet scheduling algorithm. ++ ++ To compile this driver as a module, choose M here: the module ++ will be called sch_codel. ++ ++ If unsure, say N. ++ + config NET_SCH_INGRESS + tristate "Ingress Qdisc" + depends on NET_CLS_ACT +--- a/net/sched/Makefile ++++ b/net/sched/Makefile +@@ -36,6 +36,7 @@ obj-$(CONFIG_NET_SCH_DRR) += sch_drr.o + obj-$(CONFIG_NET_SCH_MQPRIO) += sch_mqprio.o + obj-$(CONFIG_NET_SCH_CHOKE) += sch_choke.o + obj-$(CONFIG_NET_SCH_QFQ) += sch_qfq.o ++obj-$(CONFIG_NET_SCH_CODEL) += sch_codel.o + + obj-$(CONFIG_NET_CLS_U32) += cls_u32.o + obj-$(CONFIG_NET_CLS_ROUTE4) += cls_route.o +--- /dev/null ++++ b/net/sched/sch_codel.c +@@ -0,0 +1,275 @@ ++/* ++ * Codel - The Controlled-Delay Active Queue Management algorithm ++ * ++ * Copyright (C) 2011-2012 Kathleen Nichols <nichols@pollere.com> ++ * Copyright (C) 2011-2012 Van Jacobson <van@pollere.net> ++ * ++ * Implemented on linux by : ++ * Copyright (C) 2012 Michael D. Taht <dave.taht@bufferbloat.net> ++ * Copyright (C) 2012 Eric Dumazet <edumazet@google.com> ++ * ++ * Redistribution and use in source and binary forms, with or without ++ * modification, are permitted provided that the following conditions ++ * are met: ++ * 1. Redistributions of source code must retain the above copyright ++ * notice, this list of conditions, and the following disclaimer, ++ * without modification. ++ * 2. Redistributions in binary form must reproduce the above copyright ++ * notice, this list of conditions and the following disclaimer in the ++ * documentation and/or other materials provided with the distribution. ++ * 3. The names of the authors may not be used to endorse or promote products ++ * derived from this software without specific prior written permission. ++ * ++ * Alternatively, provided that this notice is retained in full, this ++ * software may be distributed under the terms of the GNU General ++ * Public License ("GPL") version 2, in which case the provisions of the ++ * GPL apply INSTEAD OF those given above. ++ * ++ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ++ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ++ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ++ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ++ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ++ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ++ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ++ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ++ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ++ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ++ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH ++ * DAMAGE. ++ * ++ */ ++ ++#include <linux/module.h> ++#include <linux/slab.h> ++#include <linux/types.h> ++#include <linux/kernel.h> ++#include <linux/errno.h> ++#include <linux/skbuff.h> ++#include <net/pkt_sched.h> ++#include <net/codel.h> ++ ++ ++#define DEFAULT_CODEL_LIMIT 1000 ++ ++struct codel_sched_data { ++ struct codel_params params; ++ struct codel_vars vars; ++ struct codel_stats stats; ++ u32 drop_overlimit; ++}; ++ ++/* This is the specific function called from codel_dequeue() ++ * to dequeue a packet from queue. Note: backlog is handled in ++ * codel, we dont need to reduce it here. ++ */ ++static struct sk_buff *dequeue(struct codel_vars *vars, struct Qdisc *sch) ++{ ++ struct sk_buff *skb = __skb_dequeue(&sch->q); ++ ++ prefetch(&skb->end); /* we'll need skb_shinfo() */ ++ return skb; ++} ++ ++static struct sk_buff *codel_qdisc_dequeue(struct Qdisc *sch) ++{ ++ struct codel_sched_data *q = qdisc_priv(sch); ++ struct sk_buff *skb; ++ ++ skb = codel_dequeue(sch, &q->params, &q->vars, &q->stats, ++ dequeue, &sch->qstats.backlog); ++ /* We cant call qdisc_tree_decrease_qlen() if our qlen is 0, ++ * or HTB crashes. Defer it for next round. ++ */ ++ if (q->stats.drop_count && sch->q.qlen) { ++ qdisc_tree_decrease_qlen(sch, q->stats.drop_count); ++ q->stats.drop_count = 0; ++ } ++ if (skb) ++ qdisc_bstats_update(sch, skb); ++ return skb; ++} ++ ++static int codel_qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) ++{ ++ struct codel_sched_data *q; ++ ++ if (likely(qdisc_qlen(sch) < sch->limit)) { ++ codel_set_enqueue_time(skb); ++ return qdisc_enqueue_tail(skb, sch); ++ } ++ q = qdisc_priv(sch); ++ q->drop_overlimit++; ++ return qdisc_drop(skb, sch); ++} ++ ++static const struct nla_policy codel_policy[TCA_CODEL_MAX + 1] = { ++ [TCA_CODEL_TARGET] = { .type = NLA_U32 }, ++ [TCA_CODEL_LIMIT] = { .type = NLA_U32 }, ++ [TCA_CODEL_INTERVAL] = { .type = NLA_U32 }, ++ [TCA_CODEL_ECN] = { .type = NLA_U32 }, ++}; ++ ++static int codel_change(struct Qdisc *sch, struct nlattr *opt) ++{ ++ struct codel_sched_data *q = qdisc_priv(sch); ++ struct nlattr *tb[TCA_CODEL_MAX + 1]; ++ unsigned int qlen; ++ int err; ++ ++ if (!opt) ++ return -EINVAL; ++ ++ err = nla_parse_nested(tb, TCA_CODEL_MAX, opt, codel_policy); ++ if (err < 0) ++ return err; ++ ++ sch_tree_lock(sch); ++ ++ if (tb[TCA_CODEL_TARGET]) { ++ u32 target = nla_get_u32(tb[TCA_CODEL_TARGET]); ++ ++ q->params.target = ((u64)target * NSEC_PER_USEC) >> CODEL_SHIFT; ++ } ++ ++ if (tb[TCA_CODEL_INTERVAL]) { ++ u32 interval = nla_get_u32(tb[TCA_CODEL_INTERVAL]); ++ ++ q->params.interval = ((u64)interval * NSEC_PER_USEC) >> CODEL_SHIFT; ++ } ++ ++ if (tb[TCA_CODEL_LIMIT]) ++ sch->limit = nla_get_u32(tb[TCA_CODEL_LIMIT]); ++ ++ if (tb[TCA_CODEL_ECN]) ++ q->params.ecn = !!nla_get_u32(tb[TCA_CODEL_ECN]); ++ ++ qlen = sch->q.qlen; ++ while (sch->q.qlen > sch->limit) { ++ struct sk_buff *skb = __skb_dequeue(&sch->q); ++ ++ sch->qstats.backlog -= qdisc_pkt_len(skb); ++ qdisc_drop(skb, sch); ++ } ++ qdisc_tree_decrease_qlen(sch, qlen - sch->q.qlen); ++ ++ sch_tree_unlock(sch); ++ return 0; ++} ++ ++static int codel_init(struct Qdisc *sch, struct nlattr *opt) ++{ ++ struct codel_sched_data *q = qdisc_priv(sch); ++ ++ sch->limit = DEFAULT_CODEL_LIMIT; ++ ++ codel_params_init(&q->params); ++ codel_vars_init(&q->vars); ++ codel_stats_init(&q->stats); ++ ++ if (opt) { ++ int err = codel_change(sch, opt); ++ ++ if (err) ++ return err; ++ } ++ ++ if (sch->limit >= 1) ++ sch->flags |= TCQ_F_CAN_BYPASS; ++ else ++ sch->flags &= ~TCQ_F_CAN_BYPASS; ++ ++ return 0; ++} ++ ++static int codel_dump(struct Qdisc *sch, struct sk_buff *skb) ++{ ++ struct codel_sched_data *q = qdisc_priv(sch); ++ struct nlattr *opts; ++ ++ opts = nla_nest_start(skb, TCA_OPTIONS); ++ if (opts == NULL) ++ goto nla_put_failure; ++ ++ if (nla_put_u32(skb, TCA_CODEL_TARGET, ++ codel_time_to_us(q->params.target)) || ++ nla_put_u32(skb, TCA_CODEL_LIMIT, ++ sch->limit) || ++ nla_put_u32(skb, TCA_CODEL_INTERVAL, ++ codel_time_to_us(q->params.interval)) || ++ nla_put_u32(skb, TCA_CODEL_ECN, ++ q->params.ecn)) ++ goto nla_put_failure; ++ ++ return nla_nest_end(skb, opts); ++ ++nla_put_failure: ++ nla_nest_cancel(skb, opts); ++ return -1; ++} ++ ++static int codel_dump_stats(struct Qdisc *sch, struct gnet_dump *d) ++{ ++ const struct codel_sched_data *q = qdisc_priv(sch); ++ struct tc_codel_xstats st = { ++ .maxpacket = q->stats.maxpacket, ++ .count = q->vars.count, ++ .lastcount = q->vars.lastcount, ++ .drop_overlimit = q->drop_overlimit, ++ .ldelay = codel_time_to_us(q->vars.ldelay), ++ .dropping = q->vars.dropping, ++ .ecn_mark = q->stats.ecn_mark, ++ }; ++ ++ if (q->vars.dropping) { ++ codel_tdiff_t delta = q->vars.drop_next - codel_get_time(); ++ ++ if (delta >= 0) ++ st.drop_next = codel_time_to_us(delta); ++ else ++ st.drop_next = -codel_time_to_us(-delta); ++ } ++ ++ return gnet_stats_copy_app(d, &st, sizeof(st)); ++} ++ ++static void codel_reset(struct Qdisc *sch) ++{ ++ struct codel_sched_data *q = qdisc_priv(sch); ++ ++ qdisc_reset_queue(sch); ++ codel_vars_init(&q->vars); ++} ++ ++static struct Qdisc_ops codel_qdisc_ops __read_mostly = { ++ .id = "codel", ++ .priv_size = sizeof(struct codel_sched_data), ++ ++ .enqueue = codel_qdisc_enqueue, ++ .dequeue = codel_qdisc_dequeue, ++ .peek = qdisc_peek_dequeued, ++ .init = codel_init, ++ .reset = codel_reset, ++ .change = codel_change, ++ .dump = codel_dump, ++ .dump_stats = codel_dump_stats, ++ .owner = THIS_MODULE, ++}; ++ ++static int __init codel_module_init(void) ++{ ++ return register_qdisc(&codel_qdisc_ops); ++} ++ ++static void __exit codel_module_exit(void) ++{ ++ unregister_qdisc(&codel_qdisc_ops); ++} ++ ++module_init(codel_module_init) ++module_exit(codel_module_exit) ++ ++MODULE_DESCRIPTION("Controlled Delay queue discipline"); ++MODULE_AUTHOR("Dave Taht"); ++MODULE_AUTHOR("Eric Dumazet"); ++MODULE_LICENSE("Dual BSD/GPL"); diff --git a/target/linux/generic/patches-3.3/041-codel-use-Newton-method-instead-of-sqrt-and-divides.patch b/target/linux/generic/patches-3.3/041-codel-use-Newton-method-instead-of-sqrt-and-divides.patch new file mode 100644 index 0000000000..97401bb12b --- /dev/null +++ b/target/linux/generic/patches-3.3/041-codel-use-Newton-method-instead-of-sqrt-and-divides.patch @@ -0,0 +1,183 @@ +From 536edd67109df5e0cdb2c4ee759e9bade7976367 Mon Sep 17 00:00:00 2001 +From: Eric Dumazet <edumazet@google.com> +Date: Sat, 12 May 2012 03:32:13 +0000 +Subject: [PATCH 37/41] codel: use Newton method instead of sqrt() and divides + +As Van pointed out, interval/sqrt(count) can be implemented using +multiplies only. + +http://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Iterative_methods_for_reciprocal_square_roots + +This patch implements the Newton method and reciprocal divide. + +Total cost is 15 cycles instead of 120 on my Corei5 machine (64bit +kernel). + +There is a small 'error' for count values < 5, but we don't really care. + +I reuse a hole in struct codel_vars : + - pack the dropping boolean into one bit + - use 31bit to store the reciprocal value of sqrt(count). + +Suggested-by: Van Jacobson <van@pollere.net> +Signed-off-by: Eric Dumazet <edumazet@google.com> +Cc: Dave Taht <dave.taht@bufferbloat.net> +Cc: Kathleen Nichols <nichols@pollere.com> +Cc: Tom Herbert <therbert@google.com> +Cc: Matt Mathis <mattmathis@google.com> +Cc: Yuchung Cheng <ycheng@google.com> +Cc: Nandita Dukkipati <nanditad@google.com> +Cc: Stephen Hemminger <shemminger@vyatta.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + include/net/codel.h | 68 ++++++++++++++++++++++++++++----------------------- + 1 file changed, 37 insertions(+), 31 deletions(-) + +--- a/include/net/codel.h ++++ b/include/net/codel.h +@@ -46,6 +46,7 @@ + #include <linux/skbuff.h> + #include <net/pkt_sched.h> + #include <net/inet_ecn.h> ++#include <linux/reciprocal_div.h> + + /* Controlling Queue Delay (CoDel) algorithm + * ========================================= +@@ -123,6 +124,7 @@ struct codel_params { + * entered dropping state + * @lastcount: count at entry to dropping state + * @dropping: set to true if in dropping state ++ * @rec_inv_sqrt: reciprocal value of sqrt(count) >> 1 + * @first_above_time: when we went (or will go) continuously above target + * for interval + * @drop_next: time to drop next packet, or when we dropped last +@@ -131,7 +133,8 @@ struct codel_params { + struct codel_vars { + u32 count; + u32 lastcount; +- bool dropping; ++ bool dropping:1; ++ u32 rec_inv_sqrt:31; + codel_time_t first_above_time; + codel_time_t drop_next; + codel_time_t ldelay; +@@ -158,11 +161,7 @@ static void codel_params_init(struct cod + + static void codel_vars_init(struct codel_vars *vars) + { +- vars->drop_next = 0; +- vars->first_above_time = 0; +- vars->dropping = false; /* exit dropping state */ +- vars->count = 0; +- vars->lastcount = 0; ++ memset(vars, 0, sizeof(*vars)); + } + + static void codel_stats_init(struct codel_stats *stats) +@@ -170,38 +169,37 @@ static void codel_stats_init(struct code + stats->maxpacket = 256; + } + +-/* return interval/sqrt(x) with good precision +- * relies on int_sqrt(unsigned long x) kernel implementation ++/* ++ * http://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Iterative_methods_for_reciprocal_square_roots ++ * new_invsqrt = (invsqrt / 2) * (3 - count * invsqrt^2) ++ * ++ * Here, invsqrt is a fixed point number (< 1.0), 31bit mantissa) + */ +-static u32 codel_inv_sqrt(u32 _interval, u32 _x) ++static void codel_Newton_step(struct codel_vars *vars) + { +- u64 interval = _interval; +- unsigned long x = _x; +- +- /* Scale operands for max precision */ ++ u32 invsqrt = vars->rec_inv_sqrt; ++ u32 invsqrt2 = ((u64)invsqrt * invsqrt) >> 31; ++ u64 val = (3LL << 31) - ((u64)vars->count * invsqrt2); + +-#if BITS_PER_LONG == 64 +- x <<= 32; /* On 64bit arches, we can prescale x by 32bits */ +- interval <<= 16; +-#endif ++ val = (val * invsqrt) >> 32; + +- while (x < (1UL << (BITS_PER_LONG - 2))) { +- x <<= 2; +- interval <<= 1; +- } +- do_div(interval, int_sqrt(x)); +- return (u32)interval; ++ vars->rec_inv_sqrt = val; + } + ++/* ++ * CoDel control_law is t + interval/sqrt(count) ++ * We maintain in rec_inv_sqrt the reciprocal value of sqrt(count) to avoid ++ * both sqrt() and divide operation. ++ */ + static codel_time_t codel_control_law(codel_time_t t, + codel_time_t interval, +- u32 count) ++ u32 rec_inv_sqrt) + { +- return t + codel_inv_sqrt(interval, count); ++ return t + reciprocal_divide(interval, rec_inv_sqrt << 1); + } + + +-static bool codel_should_drop(struct sk_buff *skb, ++static bool codel_should_drop(const struct sk_buff *skb, + unsigned int *backlog, + struct codel_vars *vars, + struct codel_params *params, +@@ -274,14 +272,16 @@ static struct sk_buff *codel_dequeue(str + */ + while (vars->dropping && + codel_time_after_eq(now, vars->drop_next)) { +- if (++vars->count == 0) /* avoid zero divides */ +- vars->count = ~0U; ++ vars->count++; /* dont care of possible wrap ++ * since there is no more divide ++ */ ++ codel_Newton_step(vars); + if (params->ecn && INET_ECN_set_ce(skb)) { + stats->ecn_mark++; + vars->drop_next = + codel_control_law(vars->drop_next, + params->interval, +- vars->count); ++ vars->rec_inv_sqrt); + goto end; + } + qdisc_drop(skb, sch); +@@ -296,7 +296,7 @@ static struct sk_buff *codel_dequeue(str + vars->drop_next = + codel_control_law(vars->drop_next, + params->interval, +- vars->count); ++ vars->rec_inv_sqrt); + } + } + } +@@ -319,12 +319,18 @@ static struct sk_buff *codel_dequeue(str + if (codel_time_before(now - vars->drop_next, + 16 * params->interval)) { + vars->count = (vars->count - vars->lastcount) | 1; ++ /* we dont care if rec_inv_sqrt approximation ++ * is not very precise : ++ * Next Newton steps will correct it quadratically. ++ */ ++ codel_Newton_step(vars); + } else { + vars->count = 1; ++ vars->rec_inv_sqrt = 0x7fffffff; + } + vars->lastcount = vars->count; + vars->drop_next = codel_control_law(now, params->interval, +- vars->count); ++ vars->rec_inv_sqrt); + } + end: + return skb; diff --git a/target/linux/generic/patches-3.3/042-fq_codel-Fair-Queue-Codel-AQM.patch b/target/linux/generic/patches-3.3/042-fq_codel-Fair-Queue-Codel-AQM.patch new file mode 100644 index 0000000000..44f208a7ea --- /dev/null +++ b/target/linux/generic/patches-3.3/042-fq_codel-Fair-Queue-Codel-AQM.patch @@ -0,0 +1,837 @@ +From 4b549a2ef4bef9965d97cbd992ba67930cd3e0fe Mon Sep 17 00:00:00 2001 +From: Eric Dumazet <edumazet@google.com> +Date: Fri, 11 May 2012 09:30:50 +0000 +Subject: [PATCH 38/41] fq_codel: Fair Queue Codel AQM + +Fair Queue Codel packet scheduler + +Principles : + +- Packets are classified (internal classifier or external) on flows. +- This is a Stochastic model (as we use a hash, several flows might + be hashed on same slot) +- Each flow has a CoDel managed queue. +- Flows are linked onto two (Round Robin) lists, + so that new flows have priority on old ones. + +- For a given flow, packets are not reordered (CoDel uses a FIFO) +- head drops only. +- ECN capability is on by default. +- Very low memory footprint (64 bytes per flow) + +tc qdisc ... fq_codel [ limit PACKETS ] [ flows number ] + [ target TIME ] [ interval TIME ] [ noecn ] + [ quantum BYTES ] + +defaults : 1024 flows, 10240 packets limit, quantum : device MTU + target : 5ms (CoDel default) + interval : 100ms (CoDel default) + +Impressive results on load : + +class htb 1:1 root leaf 10: prio 0 quantum 1514 rate 200000Kbit ceil 200000Kbit burst 1475b/8 mpu 0b overhead 0b cburst 1475b/8 mpu 0b overhead 0b level 0 + Sent 43304920109 bytes 33063109 pkt (dropped 0, overlimits 0 requeues 0) + rate 201691Kbit 28595pps backlog 0b 312p requeues 0 + lended: 33063109 borrowed: 0 giants: 0 + tokens: -912 ctokens: -912 + +class fq_codel 10:1735 parent 10: + (dropped 1292, overlimits 0 requeues 0) + backlog 15140b 10p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 7.1ms +class fq_codel 10:4524 parent 10: + (dropped 1291, overlimits 0 requeues 0) + backlog 16654b 11p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 7.1ms +class fq_codel 10:4e74 parent 10: + (dropped 1290, overlimits 0 requeues 0) + backlog 6056b 4p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 6.4ms dropping drop_next 92.0ms +class fq_codel 10:628a parent 10: + (dropped 1289, overlimits 0 requeues 0) + backlog 7570b 5p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 5.4ms dropping drop_next 90.9ms +class fq_codel 10:a4b3 parent 10: + (dropped 302, overlimits 0 requeues 0) + backlog 16654b 11p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 7.1ms +class fq_codel 10:c3c2 parent 10: + (dropped 1284, overlimits 0 requeues 0) + backlog 13626b 9p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 5.9ms +class fq_codel 10:d331 parent 10: + (dropped 299, overlimits 0 requeues 0) + backlog 15140b 10p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 7.0ms +class fq_codel 10:d526 parent 10: + (dropped 12160, overlimits 0 requeues 0) + backlog 35870b 211p requeues 0 + deficit 1508 count 12160 lastcount 1 ldelay 15.3ms dropping drop_next 247us +class fq_codel 10:e2c6 parent 10: + (dropped 1288, overlimits 0 requeues 0) + backlog 15140b 10p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 7.1ms +class fq_codel 10:eab5 parent 10: + (dropped 1285, overlimits 0 requeues 0) + backlog 16654b 11p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 5.9ms +class fq_codel 10:f220 parent 10: + (dropped 1289, overlimits 0 requeues 0) + backlog 15140b 10p requeues 0 + deficit 1514 count 1 lastcount 1 ldelay 7.1ms + +qdisc htb 1: root refcnt 6 r2q 10 default 1 direct_packets_stat 0 ver 3.17 + Sent 43331086547 bytes 33092812 pkt (dropped 0, overlimits 66063544 requeues 71) + rate 201697Kbit 28602pps backlog 0b 260p requeues 71 +qdisc fq_codel 10: parent 1:1 limit 10240p flows 65536 target 5.0ms interval 100.0ms ecn + Sent 43331086547 bytes 33092812 pkt (dropped 949359, overlimits 0 requeues 0) + rate 201697Kbit 28602pps backlog 189352b 260p requeues 0 + maxpacket 1514 drop_overlimit 0 new_flow_count 5582 ecn_mark 125593 + new_flows_len 0 old_flows_len 11 + +PING 172.30.42.18 (172.30.42.18) 56(84) bytes of data. +64 bytes from 172.30.42.18: icmp_req=1 ttl=64 time=0.227 ms +64 bytes from 172.30.42.18: icmp_req=2 ttl=64 time=0.165 ms +64 bytes from 172.30.42.18: icmp_req=3 ttl=64 time=0.166 ms +64 bytes from 172.30.42.18: icmp_req=4 ttl=64 time=0.151 ms +64 bytes from 172.30.42.18: icmp_req=5 ttl=64 time=0.164 ms +64 bytes from 172.30.42.18: icmp_req=6 ttl=64 time=0.172 ms +64 bytes from 172.30.42.18: icmp_req=7 ttl=64 time=0.175 ms +64 bytes from 172.30.42.18: icmp_req=8 ttl=64 time=0.183 ms +64 bytes from 172.30.42.18: icmp_req=9 ttl=64 time=0.158 ms +64 bytes from 172.30.42.18: icmp_req=10 ttl=64 time=0.200 ms + +10 packets transmitted, 10 received, 0% packet loss, time 8999ms +rtt min/avg/max/mdev = 0.151/0.176/0.227/0.022 ms + +Much better than SFQ because of priority given to new flows, and fast +path dirtying less cache lines. + +Signed-off-by: Eric Dumazet <edumazet@google.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + include/linux/pkt_sched.h | 54 ++++ + net/sched/Kconfig | 11 + + net/sched/Makefile | 1 + + net/sched/sch_fq_codel.c | 624 +++++++++++++++++++++++++++++++++++++++++++++ + 4 files changed, 690 insertions(+) + create mode 100644 net/sched/sch_fq_codel.c + +--- a/include/linux/pkt_sched.h ++++ b/include/linux/pkt_sched.h +@@ -659,4 +659,58 @@ struct tc_codel_xstats { + __u32 dropping; /* are we in dropping state ? */ + }; + ++/* FQ_CODEL */ ++ ++enum { ++ TCA_FQ_CODEL_UNSPEC, ++ TCA_FQ_CODEL_TARGET, ++ TCA_FQ_CODEL_LIMIT, ++ TCA_FQ_CODEL_INTERVAL, ++ TCA_FQ_CODEL_ECN, ++ TCA_FQ_CODEL_FLOWS, ++ TCA_FQ_CODEL_QUANTUM, ++ __TCA_FQ_CODEL_MAX ++}; ++ ++#define TCA_FQ_CODEL_MAX (__TCA_FQ_CODEL_MAX - 1) ++ ++enum { ++ TCA_FQ_CODEL_XSTATS_QDISC, ++ TCA_FQ_CODEL_XSTATS_CLASS, ++}; ++ ++struct tc_fq_codel_qd_stats { ++ __u32 maxpacket; /* largest packet we've seen so far */ ++ __u32 drop_overlimit; /* number of time max qdisc ++ * packet limit was hit ++ */ ++ __u32 ecn_mark; /* number of packets we ECN marked ++ * instead of being dropped ++ */ ++ __u32 new_flow_count; /* number of time packets ++ * created a 'new flow' ++ */ ++ __u32 new_flows_len; /* count of flows in new list */ ++ __u32 old_flows_len; /* count of flows in old list */ ++}; ++ ++struct tc_fq_codel_cl_stats { ++ __s32 deficit; ++ __u32 ldelay; /* in-queue delay seen by most recently ++ * dequeued packet ++ */ ++ __u32 count; ++ __u32 lastcount; ++ __u32 dropping; ++ __s32 drop_next; ++}; ++ ++struct tc_fq_codel_xstats { ++ __u32 type; ++ union { ++ struct tc_fq_codel_qd_stats qdisc_stats; ++ struct tc_fq_codel_cl_stats class_stats; ++ }; ++}; ++ + #endif +--- a/net/sched/Kconfig ++++ b/net/sched/Kconfig +@@ -261,6 +261,17 @@ config NET_SCH_CODEL + + If unsure, say N. + ++config NET_SCH_FQ_CODEL ++ tristate "Fair Queue Controlled Delay AQM (FQ_CODEL)" ++ help ++ Say Y here if you want to use the FQ Controlled Delay (FQ_CODEL) ++ packet scheduling algorithm. ++ ++ To compile this driver as a module, choose M here: the module ++ will be called sch_fq_codel. ++ ++ If unsure, say N. ++ + config NET_SCH_INGRESS + tristate "Ingress Qdisc" + depends on NET_CLS_ACT +--- a/net/sched/Makefile ++++ b/net/sched/Makefile +@@ -37,6 +37,7 @@ obj-$(CONFIG_NET_SCH_MQPRIO) += sch_mqpr + obj-$(CONFIG_NET_SCH_CHOKE) += sch_choke.o + obj-$(CONFIG_NET_SCH_QFQ) += sch_qfq.o + obj-$(CONFIG_NET_SCH_CODEL) += sch_codel.o ++obj-$(CONFIG_NET_SCH_FQ_CODEL) += sch_fq_codel.o + + obj-$(CONFIG_NET_CLS_U32) += cls_u32.o + obj-$(CONFIG_NET_CLS_ROUTE4) += cls_route.o +--- /dev/null ++++ b/net/sched/sch_fq_codel.c +@@ -0,0 +1,624 @@ ++/* ++ * Fair Queue CoDel 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. ++ * ++ * Copyright (C) 2012 Eric Dumazet <edumazet@google.com> ++ */ ++ ++#include <linux/module.h> ++#include <linux/types.h> ++#include <linux/kernel.h> ++#include <linux/jiffies.h> ++#include <linux/string.h> ++#include <linux/in.h> ++#include <linux/errno.h> ++#include <linux/init.h> ++#include <linux/skbuff.h> ++#include <linux/jhash.h> ++#include <linux/slab.h> ++#include <linux/vmalloc.h> ++#include <net/netlink.h> ++#include <net/pkt_sched.h> ++#include <net/flow_keys.h> ++#include <net/codel.h> ++ ++/* Fair Queue CoDel. ++ * ++ * Principles : ++ * Packets are classified (internal classifier or external) on flows. ++ * This is a Stochastic model (as we use a hash, several flows ++ * might be hashed on same slot) ++ * Each flow has a CoDel managed queue. ++ * Flows are linked onto two (Round Robin) lists, ++ * so that new flows have priority on old ones. ++ * ++ * For a given flow, packets are not reordered (CoDel uses a FIFO) ++ * head drops only. ++ * ECN capability is on by default. ++ * Low memory footprint (64 bytes per flow) ++ */ ++ ++struct fq_codel_flow { ++ struct sk_buff *head; ++ struct sk_buff *tail; ++ struct list_head flowchain; ++ int deficit; ++ u32 dropped; /* number of drops (or ECN marks) on this flow */ ++ struct codel_vars cvars; ++}; /* please try to keep this structure <= 64 bytes */ ++ ++struct fq_codel_sched_data { ++ struct tcf_proto *filter_list; /* optional external classifier */ ++ struct fq_codel_flow *flows; /* Flows table [flows_cnt] */ ++ u32 *backlogs; /* backlog table [flows_cnt] */ ++ u32 flows_cnt; /* number of flows */ ++ u32 perturbation; /* hash perturbation */ ++ u32 quantum; /* psched_mtu(qdisc_dev(sch)); */ ++ struct codel_params cparams; ++ struct codel_stats cstats; ++ u32 drop_overlimit; ++ u32 new_flow_count; ++ ++ struct list_head new_flows; /* list of new flows */ ++ struct list_head old_flows; /* list of old flows */ ++}; ++ ++static unsigned int fq_codel_hash(const struct fq_codel_sched_data *q, ++ const struct sk_buff *skb) ++{ ++ struct flow_keys keys; ++ unsigned int hash; ++ ++ skb_flow_dissect(skb, &keys); ++ hash = jhash_3words((__force u32)keys.dst, ++ (__force u32)keys.src ^ keys.ip_proto, ++ (__force u32)keys.ports, q->perturbation); ++ return ((u64)hash * q->flows_cnt) >> 32; ++} ++ ++static unsigned int fq_codel_classify(struct sk_buff *skb, struct Qdisc *sch, ++ int *qerr) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ struct tcf_result res; ++ int result; ++ ++ if (TC_H_MAJ(skb->priority) == sch->handle && ++ TC_H_MIN(skb->priority) > 0 && ++ TC_H_MIN(skb->priority) <= q->flows_cnt) ++ return TC_H_MIN(skb->priority); ++ ++ if (!q->filter_list) ++ return fq_codel_hash(q, skb) + 1; ++ ++ *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; ++ result = tc_classify(skb, q->filter_list, &res); ++ if (result >= 0) { ++#ifdef CONFIG_NET_CLS_ACT ++ switch (result) { ++ case TC_ACT_STOLEN: ++ case TC_ACT_QUEUED: ++ *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; ++ case TC_ACT_SHOT: ++ return 0; ++ } ++#endif ++ if (TC_H_MIN(res.classid) <= q->flows_cnt) ++ return TC_H_MIN(res.classid); ++ } ++ return 0; ++} ++ ++/* helper functions : might be changed when/if skb use a standard list_head */ ++ ++/* remove one skb from head of slot queue */ ++static inline struct sk_buff *dequeue_head(struct fq_codel_flow *flow) ++{ ++ struct sk_buff *skb = flow->head; ++ ++ flow->head = skb->next; ++ skb->next = NULL; ++ return skb; ++} ++ ++/* add skb to flow queue (tail add) */ ++static inline void flow_queue_add(struct fq_codel_flow *flow, ++ struct sk_buff *skb) ++{ ++ if (flow->head == NULL) ++ flow->head = skb; ++ else ++ flow->tail->next = skb; ++ flow->tail = skb; ++ skb->next = NULL; ++} ++ ++static unsigned int fq_codel_drop(struct Qdisc *sch) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ struct sk_buff *skb; ++ unsigned int maxbacklog = 0, idx = 0, i, len; ++ struct fq_codel_flow *flow; ++ ++ /* Queue is full! Find the fat flow and drop packet from it. ++ * This might sound expensive, but with 1024 flows, we scan ++ * 4KB of memory, and we dont need to handle a complex tree ++ * in fast path (packet queue/enqueue) with many cache misses. ++ */ ++ for (i = 0; i < q->flows_cnt; i++) { ++ if (q->backlogs[i] > maxbacklog) { ++ maxbacklog = q->backlogs[i]; ++ idx = i; ++ } ++ } ++ flow = &q->flows[idx]; ++ skb = dequeue_head(flow); ++ len = qdisc_pkt_len(skb); ++ q->backlogs[idx] -= len; ++ kfree_skb(skb); ++ sch->q.qlen--; ++ sch->qstats.drops++; ++ sch->qstats.backlog -= len; ++ flow->dropped++; ++ return idx; ++} ++ ++static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ unsigned int idx; ++ struct fq_codel_flow *flow; ++ int uninitialized_var(ret); ++ ++ idx = fq_codel_classify(skb, sch, &ret); ++ if (idx == 0) { ++ if (ret & __NET_XMIT_BYPASS) ++ sch->qstats.drops++; ++ kfree_skb(skb); ++ return ret; ++ } ++ idx--; ++ ++ codel_set_enqueue_time(skb); ++ flow = &q->flows[idx]; ++ flow_queue_add(flow, skb); ++ q->backlogs[idx] += qdisc_pkt_len(skb); ++ sch->qstats.backlog += qdisc_pkt_len(skb); ++ ++ if (list_empty(&flow->flowchain)) { ++ list_add_tail(&flow->flowchain, &q->new_flows); ++ codel_vars_init(&flow->cvars); ++ q->new_flow_count++; ++ flow->deficit = q->quantum; ++ flow->dropped = 0; ++ } ++ if (++sch->q.qlen < sch->limit) ++ return NET_XMIT_SUCCESS; ++ ++ q->drop_overlimit++; ++ /* Return Congestion Notification only if we dropped a packet ++ * from this flow. ++ */ ++ if (fq_codel_drop(sch) == idx) ++ return NET_XMIT_CN; ++ ++ /* As we dropped a packet, better let upper stack know this */ ++ qdisc_tree_decrease_qlen(sch, 1); ++ return NET_XMIT_SUCCESS; ++} ++ ++/* This is the specific function called from codel_dequeue() ++ * to dequeue a packet from queue. Note: backlog is handled in ++ * codel, we dont need to reduce it here. ++ */ ++static struct sk_buff *dequeue(struct codel_vars *vars, struct Qdisc *sch) ++{ ++ struct fq_codel_flow *flow; ++ struct sk_buff *skb = NULL; ++ ++ flow = container_of(vars, struct fq_codel_flow, cvars); ++ if (flow->head) { ++ skb = dequeue_head(flow); ++ sch->qstats.backlog -= qdisc_pkt_len(skb); ++ sch->q.qlen--; ++ } ++ return skb; ++} ++ ++static struct sk_buff *fq_codel_dequeue(struct Qdisc *sch) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ struct sk_buff *skb; ++ struct fq_codel_flow *flow; ++ struct list_head *head; ++ u32 prev_drop_count, prev_ecn_mark; ++ ++begin: ++ head = &q->new_flows; ++ if (list_empty(head)) { ++ head = &q->old_flows; ++ if (list_empty(head)) ++ return NULL; ++ } ++ flow = list_first_entry(head, struct fq_codel_flow, flowchain); ++ ++ if (flow->deficit <= 0) { ++ flow->deficit += q->quantum; ++ list_move_tail(&flow->flowchain, &q->old_flows); ++ goto begin; ++ } ++ ++ prev_drop_count = q->cstats.drop_count; ++ prev_ecn_mark = q->cstats.ecn_mark; ++ ++ skb = codel_dequeue(sch, &q->cparams, &flow->cvars, &q->cstats, ++ dequeue, &q->backlogs[flow - q->flows]); ++ ++ flow->dropped += q->cstats.drop_count - prev_drop_count; ++ flow->dropped += q->cstats.ecn_mark - prev_ecn_mark; ++ ++ if (!skb) { ++ /* force a pass through old_flows to prevent starvation */ ++ if ((head == &q->new_flows) && !list_empty(&q->old_flows)) ++ list_move_tail(&flow->flowchain, &q->old_flows); ++ else ++ list_del_init(&flow->flowchain); ++ goto begin; ++ } ++ qdisc_bstats_update(sch, skb); ++ flow->deficit -= qdisc_pkt_len(skb); ++ /* We cant call qdisc_tree_decrease_qlen() if our qlen is 0, ++ * or HTB crashes. Defer it for next round. ++ */ ++ if (q->cstats.drop_count && sch->q.qlen) { ++ qdisc_tree_decrease_qlen(sch, q->cstats.drop_count); ++ q->cstats.drop_count = 0; ++ } ++ return skb; ++} ++ ++static void fq_codel_reset(struct Qdisc *sch) ++{ ++ struct sk_buff *skb; ++ ++ while ((skb = fq_codel_dequeue(sch)) != NULL) ++ kfree_skb(skb); ++} ++ ++static const struct nla_policy fq_codel_policy[TCA_FQ_CODEL_MAX + 1] = { ++ [TCA_FQ_CODEL_TARGET] = { .type = NLA_U32 }, ++ [TCA_FQ_CODEL_LIMIT] = { .type = NLA_U32 }, ++ [TCA_FQ_CODEL_INTERVAL] = { .type = NLA_U32 }, ++ [TCA_FQ_CODEL_ECN] = { .type = NLA_U32 }, ++ [TCA_FQ_CODEL_FLOWS] = { .type = NLA_U32 }, ++ [TCA_FQ_CODEL_QUANTUM] = { .type = NLA_U32 }, ++}; ++ ++static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ struct nlattr *tb[TCA_FQ_CODEL_MAX + 1]; ++ int err; ++ ++ if (!opt) ++ return -EINVAL; ++ ++ err = nla_parse_nested(tb, TCA_FQ_CODEL_MAX, opt, fq_codel_policy); ++ if (err < 0) ++ return err; ++ if (tb[TCA_FQ_CODEL_FLOWS]) { ++ if (q->flows) ++ return -EINVAL; ++ q->flows_cnt = nla_get_u32(tb[TCA_FQ_CODEL_FLOWS]); ++ if (!q->flows_cnt || ++ q->flows_cnt > 65536) ++ return -EINVAL; ++ } ++ sch_tree_lock(sch); ++ ++ if (tb[TCA_FQ_CODEL_TARGET]) { ++ u64 target = nla_get_u32(tb[TCA_FQ_CODEL_TARGET]); ++ ++ q->cparams.target = (target * NSEC_PER_USEC) >> CODEL_SHIFT; ++ } ++ ++ if (tb[TCA_FQ_CODEL_INTERVAL]) { ++ u64 interval = nla_get_u32(tb[TCA_FQ_CODEL_INTERVAL]); ++ ++ q->cparams.interval = (interval * NSEC_PER_USEC) >> CODEL_SHIFT; ++ } ++ ++ if (tb[TCA_FQ_CODEL_LIMIT]) ++ sch->limit = nla_get_u32(tb[TCA_FQ_CODEL_LIMIT]); ++ ++ if (tb[TCA_FQ_CODEL_ECN]) ++ q->cparams.ecn = !!nla_get_u32(tb[TCA_FQ_CODEL_ECN]); ++ ++ if (tb[TCA_FQ_CODEL_QUANTUM]) ++ q->quantum = max(256U, nla_get_u32(tb[TCA_FQ_CODEL_QUANTUM])); ++ ++ while (sch->q.qlen > sch->limit) { ++ struct sk_buff *skb = fq_codel_dequeue(sch); ++ ++ kfree_skb(skb); ++ q->cstats.drop_count++; ++ } ++ qdisc_tree_decrease_qlen(sch, q->cstats.drop_count); ++ q->cstats.drop_count = 0; ++ ++ sch_tree_unlock(sch); ++ return 0; ++} ++ ++static void *fq_codel_zalloc(size_t sz) ++{ ++ void *ptr = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN); ++ ++ if (!ptr) ++ ptr = vzalloc(sz); ++ return ptr; ++} ++ ++static void fq_codel_free(void *addr) ++{ ++ if (addr) { ++ if (is_vmalloc_addr(addr)) ++ vfree(addr); ++ else ++ kfree(addr); ++ } ++} ++ ++static void fq_codel_destroy(struct Qdisc *sch) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ ++ tcf_destroy_chain(&q->filter_list); ++ fq_codel_free(q->backlogs); ++ fq_codel_free(q->flows); ++} ++ ++static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ int i; ++ ++ sch->limit = 10*1024; ++ q->flows_cnt = 1024; ++ q->quantum = psched_mtu(qdisc_dev(sch)); ++ q->perturbation = net_random(); ++ INIT_LIST_HEAD(&q->new_flows); ++ INIT_LIST_HEAD(&q->old_flows); ++ codel_params_init(&q->cparams); ++ codel_stats_init(&q->cstats); ++ q->cparams.ecn = true; ++ ++ if (opt) { ++ int err = fq_codel_change(sch, opt); ++ if (err) ++ return err; ++ } ++ ++ if (!q->flows) { ++ q->flows = fq_codel_zalloc(q->flows_cnt * ++ sizeof(struct fq_codel_flow)); ++ if (!q->flows) ++ return -ENOMEM; ++ q->backlogs = fq_codel_zalloc(q->flows_cnt * sizeof(u32)); ++ if (!q->backlogs) { ++ fq_codel_free(q->flows); ++ return -ENOMEM; ++ } ++ for (i = 0; i < q->flows_cnt; i++) { ++ struct fq_codel_flow *flow = q->flows + i; ++ ++ INIT_LIST_HEAD(&flow->flowchain); ++ } ++ } ++ if (sch->limit >= 1) ++ sch->flags |= TCQ_F_CAN_BYPASS; ++ else ++ sch->flags &= ~TCQ_F_CAN_BYPASS; ++ return 0; ++} ++ ++static int fq_codel_dump(struct Qdisc *sch, struct sk_buff *skb) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ struct nlattr *opts; ++ ++ opts = nla_nest_start(skb, TCA_OPTIONS); ++ if (opts == NULL) ++ goto nla_put_failure; ++ ++ if (nla_put_u32(skb, TCA_FQ_CODEL_TARGET, ++ codel_time_to_us(q->cparams.target)) || ++ nla_put_u32(skb, TCA_FQ_CODEL_LIMIT, ++ sch->limit) || ++ nla_put_u32(skb, TCA_FQ_CODEL_INTERVAL, ++ codel_time_to_us(q->cparams.interval)) || ++ nla_put_u32(skb, TCA_FQ_CODEL_ECN, ++ q->cparams.ecn) || ++ nla_put_u32(skb, TCA_FQ_CODEL_QUANTUM, ++ q->quantum) || ++ nla_put_u32(skb, TCA_FQ_CODEL_FLOWS, ++ q->flows_cnt)) ++ goto nla_put_failure; ++ ++ nla_nest_end(skb, opts); ++ return skb->len; ++ ++nla_put_failure: ++ return -1; ++} ++ ++static int fq_codel_dump_stats(struct Qdisc *sch, struct gnet_dump *d) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ struct tc_fq_codel_xstats st = { ++ .type = TCA_FQ_CODEL_XSTATS_QDISC, ++ .qdisc_stats.maxpacket = q->cstats.maxpacket, ++ .qdisc_stats.drop_overlimit = q->drop_overlimit, ++ .qdisc_stats.ecn_mark = q->cstats.ecn_mark, ++ .qdisc_stats.new_flow_count = q->new_flow_count, ++ }; ++ struct list_head *pos; ++ ++ list_for_each(pos, &q->new_flows) ++ st.qdisc_stats.new_flows_len++; ++ ++ list_for_each(pos, &q->old_flows) ++ st.qdisc_stats.old_flows_len++; ++ ++ return gnet_stats_copy_app(d, &st, sizeof(st)); ++} ++ ++static struct Qdisc *fq_codel_leaf(struct Qdisc *sch, unsigned long arg) ++{ ++ return NULL; ++} ++ ++static unsigned long fq_codel_get(struct Qdisc *sch, u32 classid) ++{ ++ return 0; ++} ++ ++static unsigned long fq_codel_bind(struct Qdisc *sch, unsigned long parent, ++ u32 classid) ++{ ++ /* we cannot bypass queue discipline anymore */ ++ sch->flags &= ~TCQ_F_CAN_BYPASS; ++ return 0; ++} ++ ++static void fq_codel_put(struct Qdisc *q, unsigned long cl) ++{ ++} ++ ++static struct tcf_proto **fq_codel_find_tcf(struct Qdisc *sch, unsigned long cl) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ ++ if (cl) ++ return NULL; ++ return &q->filter_list; ++} ++ ++static int fq_codel_dump_class(struct Qdisc *sch, unsigned long cl, ++ struct sk_buff *skb, struct tcmsg *tcm) ++{ ++ tcm->tcm_handle |= TC_H_MIN(cl); ++ return 0; ++} ++ ++static int fq_codel_dump_class_stats(struct Qdisc *sch, unsigned long cl, ++ struct gnet_dump *d) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ u32 idx = cl - 1; ++ struct gnet_stats_queue qs = { 0 }; ++ struct tc_fq_codel_xstats xstats; ++ ++ if (idx < q->flows_cnt) { ++ const struct fq_codel_flow *flow = &q->flows[idx]; ++ const struct sk_buff *skb = flow->head; ++ ++ memset(&xstats, 0, sizeof(xstats)); ++ xstats.type = TCA_FQ_CODEL_XSTATS_CLASS; ++ xstats.class_stats.deficit = flow->deficit; ++ xstats.class_stats.ldelay = ++ codel_time_to_us(flow->cvars.ldelay); ++ xstats.class_stats.count = flow->cvars.count; ++ xstats.class_stats.lastcount = flow->cvars.lastcount; ++ xstats.class_stats.dropping = flow->cvars.dropping; ++ if (flow->cvars.dropping) { ++ codel_tdiff_t delta = flow->cvars.drop_next - ++ codel_get_time(); ++ ++ xstats.class_stats.drop_next = (delta >= 0) ? ++ codel_time_to_us(delta) : ++ -codel_time_to_us(-delta); ++ } ++ while (skb) { ++ qs.qlen++; ++ skb = skb->next; ++ } ++ qs.backlog = q->backlogs[idx]; ++ qs.drops = flow->dropped; ++ } ++ if (gnet_stats_copy_queue(d, &qs) < 0) ++ return -1; ++ if (idx < q->flows_cnt) ++ return gnet_stats_copy_app(d, &xstats, sizeof(xstats)); ++ return 0; ++} ++ ++static void fq_codel_walk(struct Qdisc *sch, struct qdisc_walker *arg) ++{ ++ struct fq_codel_sched_data *q = qdisc_priv(sch); ++ unsigned int i; ++ ++ if (arg->stop) ++ return; ++ ++ for (i = 0; i < q->flows_cnt; i++) { ++ if (list_empty(&q->flows[i].flowchain) || ++ arg->count < arg->skip) { ++ arg->count++; ++ continue; ++ } ++ if (arg->fn(sch, i + 1, arg) < 0) { ++ arg->stop = 1; ++ break; ++ } ++ arg->count++; ++ } ++} ++ ++static const struct Qdisc_class_ops fq_codel_class_ops = { ++ .leaf = fq_codel_leaf, ++ .get = fq_codel_get, ++ .put = fq_codel_put, ++ .tcf_chain = fq_codel_find_tcf, ++ .bind_tcf = fq_codel_bind, ++ .unbind_tcf = fq_codel_put, ++ .dump = fq_codel_dump_class, ++ .dump_stats = fq_codel_dump_class_stats, ++ .walk = fq_codel_walk, ++}; ++ ++static struct Qdisc_ops fq_codel_qdisc_ops __read_mostly = { ++ .cl_ops = &fq_codel_class_ops, ++ .id = "fq_codel", ++ .priv_size = sizeof(struct fq_codel_sched_data), ++ .enqueue = fq_codel_enqueue, ++ .dequeue = fq_codel_dequeue, ++ .peek = qdisc_peek_dequeued, ++ .drop = fq_codel_drop, ++ .init = fq_codel_init, ++ .reset = fq_codel_reset, ++ .destroy = fq_codel_destroy, ++ .change = fq_codel_change, ++ .dump = fq_codel_dump, ++ .dump_stats = fq_codel_dump_stats, ++ .owner = THIS_MODULE, ++}; ++ ++static int __init fq_codel_module_init(void) ++{ ++ return register_qdisc(&fq_codel_qdisc_ops); ++} ++ ++static void __exit fq_codel_module_exit(void) ++{ ++ unregister_qdisc(&fq_codel_qdisc_ops); ++} ++ ++module_init(fq_codel_module_init) ++module_exit(fq_codel_module_exit) ++MODULE_AUTHOR("Eric Dumazet"); ++MODULE_LICENSE("GPL"); diff --git a/target/linux/generic/patches-3.3/043-net-codel-Add-missing-include-linux-prefetch.h.patch b/target/linux/generic/patches-3.3/043-net-codel-Add-missing-include-linux-prefetch.h.patch new file mode 100644 index 0000000000..cb2a72af8d --- /dev/null +++ b/target/linux/generic/patches-3.3/043-net-codel-Add-missing-include-linux-prefetch.h.patch @@ -0,0 +1,31 @@ +From ce5b4b977127ee20c3f9c3fd3637cd3796f649f5 Mon Sep 17 00:00:00 2001 +From: Geert Uytterhoeven <geert@linux-m68k.org> +Date: Mon, 14 May 2012 09:47:05 +0000 +Subject: [PATCH 44/50] net/codel: Add missing #include <linux/prefetch.h> +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +m68k allmodconfig: + +net/sched/sch_codel.c: In function ‘dequeue’: +net/sched/sch_codel.c:70: error: implicit declaration of function ‘prefetch’ +make[1]: *** [net/sched/sch_codel.o] Error 1 + +Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> +Acked-by: Eric Dumazet <edumazet@google.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + net/sched/sch_codel.c | 1 + + 1 file changed, 1 insertion(+) + +--- a/net/sched/sch_codel.c ++++ b/net/sched/sch_codel.c +@@ -46,6 +46,7 @@ + #include <linux/kernel.h> + #include <linux/errno.h> + #include <linux/skbuff.h> ++#include <linux/prefetch.h> + #include <net/pkt_sched.h> + #include <net/codel.h> + diff --git a/target/linux/generic/patches-3.3/044-net-codel-fix-build-errors.patch b/target/linux/generic/patches-3.3/044-net-codel-fix-build-errors.patch new file mode 100644 index 0000000000..36f16d2bfd --- /dev/null +++ b/target/linux/generic/patches-3.3/044-net-codel-fix-build-errors.patch @@ -0,0 +1,49 @@ +From 669d67bf777def468970f2dcba1537edf3b2d329 Mon Sep 17 00:00:00 2001 +From: Sasha Levin <levinsasha928@gmail.com> +Date: Mon, 14 May 2012 11:57:06 +0000 +Subject: [PATCH 45/50] net: codel: fix build errors + +Fix the following build error: + +net/sched/sch_fq_codel.c: In function 'fq_codel_dump_stats': +net/sched/sch_fq_codel.c:464:3: error: unknown field 'qdisc_stats' specified in initializer +net/sched/sch_fq_codel.c:464:3: warning: missing braces around initializer +net/sched/sch_fq_codel.c:464:3: warning: (near initialization for 'st.<anonymous>') +net/sched/sch_fq_codel.c:465:3: error: unknown field 'qdisc_stats' specified in initializer +net/sched/sch_fq_codel.c:465:3: warning: excess elements in struct initializer +net/sched/sch_fq_codel.c:465:3: warning: (near initialization for 'st') +net/sched/sch_fq_codel.c:466:3: error: unknown field 'qdisc_stats' specified in initializer +net/sched/sch_fq_codel.c:466:3: warning: excess elements in struct initializer +net/sched/sch_fq_codel.c:466:3: warning: (near initialization for 'st') +net/sched/sch_fq_codel.c:467:3: error: unknown field 'qdisc_stats' specified in initializer +net/sched/sch_fq_codel.c:467:3: warning: excess elements in struct initializer +net/sched/sch_fq_codel.c:467:3: warning: (near initialization for 'st') +make[1]: *** [net/sched/sch_fq_codel.o] Error 1 + +Signed-off-by: Sasha Levin <levinsasha928@gmail.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + net/sched/sch_fq_codel.c | 9 +++++---- + 1 file changed, 5 insertions(+), 4 deletions(-) + +--- a/net/sched/sch_fq_codel.c ++++ b/net/sched/sch_fq_codel.c +@@ -461,13 +461,14 @@ static int fq_codel_dump_stats(struct Qd + struct fq_codel_sched_data *q = qdisc_priv(sch); + struct tc_fq_codel_xstats st = { + .type = TCA_FQ_CODEL_XSTATS_QDISC, +- .qdisc_stats.maxpacket = q->cstats.maxpacket, +- .qdisc_stats.drop_overlimit = q->drop_overlimit, +- .qdisc_stats.ecn_mark = q->cstats.ecn_mark, +- .qdisc_stats.new_flow_count = q->new_flow_count, + }; + struct list_head *pos; + ++ st.qdisc_stats.maxpacket = q->cstats.maxpacket; ++ st.qdisc_stats.drop_overlimit = q->drop_overlimit; ++ st.qdisc_stats.ecn_mark = q->cstats.ecn_mark; ++ st.qdisc_stats.new_flow_count = q->new_flow_count; ++ + list_for_each(pos, &q->new_flows) + st.qdisc_stats.new_flows_len++; + diff --git a/target/linux/generic/patches-3.3/045-codel-use-u16-field-instead-of-31bits-for-rec_inv_sq.patch b/target/linux/generic/patches-3.3/045-codel-use-u16-field-instead-of-31bits-for-rec_inv_sq.patch new file mode 100644 index 0000000000..814aebc61d --- /dev/null +++ b/target/linux/generic/patches-3.3/045-codel-use-u16-field-instead-of-31bits-for-rec_inv_sq.patch @@ -0,0 +1,85 @@ +From 6ff272c9ad65eda219cd975b9da2dbc31cc812ee Mon Sep 17 00:00:00 2001 +From: Eric Dumazet <eric.dumazet@gmail.com> +Date: Sat, 12 May 2012 21:23:23 +0000 +Subject: [PATCH 46/50] codel: use u16 field instead of 31bits for + rec_inv_sqrt + +David pointed out gcc might generate poor code with 31bit fields. + +Using u16 is more than enough and permits a better code output. + +Also make the code intent more readable using constants, fixed point arithmetic +not being trivial for everybody. + +Suggested-by: David Miller <davem@davemloft.net> +Signed-off-by: Eric Dumazet <edumazet@google.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + include/net/codel.h | 25 +++++++++++++++---------- + 1 file changed, 15 insertions(+), 10 deletions(-) + +--- a/include/net/codel.h ++++ b/include/net/codel.h +@@ -133,13 +133,17 @@ struct codel_params { + struct codel_vars { + u32 count; + u32 lastcount; +- bool dropping:1; +- u32 rec_inv_sqrt:31; ++ bool dropping; ++ u16 rec_inv_sqrt; + codel_time_t first_above_time; + codel_time_t drop_next; + codel_time_t ldelay; + }; + ++#define REC_INV_SQRT_BITS (8 * sizeof(u16)) /* or sizeof_in_bits(rec_inv_sqrt) */ ++/* needed shift to get a Q0.32 number from rec_inv_sqrt */ ++#define REC_INV_SQRT_SHIFT (32 - REC_INV_SQRT_BITS) ++ + /** + * struct codel_stats - contains codel shared variables and stats + * @maxpacket: largest packet we've seen so far +@@ -173,17 +177,18 @@ static void codel_stats_init(struct code + * http://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Iterative_methods_for_reciprocal_square_roots + * new_invsqrt = (invsqrt / 2) * (3 - count * invsqrt^2) + * +- * Here, invsqrt is a fixed point number (< 1.0), 31bit mantissa) ++ * Here, invsqrt is a fixed point number (< 1.0), 32bit mantissa, aka Q0.32 + */ + static void codel_Newton_step(struct codel_vars *vars) + { +- u32 invsqrt = vars->rec_inv_sqrt; +- u32 invsqrt2 = ((u64)invsqrt * invsqrt) >> 31; +- u64 val = (3LL << 31) - ((u64)vars->count * invsqrt2); ++ u32 invsqrt = ((u32)vars->rec_inv_sqrt) << REC_INV_SQRT_SHIFT; ++ u32 invsqrt2 = ((u64)invsqrt * invsqrt) >> 32; ++ u64 val = (3LL << 32) - ((u64)vars->count * invsqrt2); + +- val = (val * invsqrt) >> 32; ++ val >>= 2; /* avoid overflow in following multiply */ ++ val = (val * invsqrt) >> (32 - 2 + 1); + +- vars->rec_inv_sqrt = val; ++ vars->rec_inv_sqrt = val >> REC_INV_SQRT_SHIFT; + } + + /* +@@ -195,7 +200,7 @@ static codel_time_t codel_control_law(co + codel_time_t interval, + u32 rec_inv_sqrt) + { +- return t + reciprocal_divide(interval, rec_inv_sqrt << 1); ++ return t + reciprocal_divide(interval, rec_inv_sqrt << REC_INV_SQRT_SHIFT); + } + + +@@ -326,7 +331,7 @@ static struct sk_buff *codel_dequeue(str + codel_Newton_step(vars); + } else { + vars->count = 1; +- vars->rec_inv_sqrt = 0x7fffffff; ++ vars->rec_inv_sqrt = ~0U >> REC_INV_SQRT_SHIFT; + } + vars->lastcount = vars->count; + vars->drop_next = codel_control_law(now, params->interval, diff --git a/target/linux/generic/patches-3.3/621-sched_act_connmark.patch b/target/linux/generic/patches-3.3/621-sched_act_connmark.patch index 157421d209..eceec0a1e4 100644 --- a/target/linux/generic/patches-3.3/621-sched_act_connmark.patch +++ b/target/linux/generic/patches-3.3/621-sched_act_connmark.patch @@ -140,7 +140,7 @@ +module_exit(connmark_cleanup_module); --- a/net/sched/Kconfig +++ b/net/sched/Kconfig -@@ -602,6 +602,19 @@ config NET_ACT_CSUM +@@ -624,6 +624,19 @@ config NET_ACT_CSUM To compile this code as a module, choose M here: the module will be called act_csum. |