aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/generic/patches-3.3/042-fq_codel-Fair-Queue-Codel-AQM.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/generic/patches-3.3/042-fq_codel-Fair-Queue-Codel-AQM.patch')
-rw-r--r--target/linux/generic/patches-3.3/042-fq_codel-Fair-Queue-Codel-AQM.patch837
1 files changed, 837 insertions, 0 deletions
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");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 09:28:57 +0000