+++ /dev/null
-From f8cf19c19528a468cc0b9846c0328a94cccdc605 Mon Sep 17 00:00:00 2001
-From: Eric Dumazet <edumazet@google.com>
-Date: Fri, 11 May 2012 09:30:50 +0000
-Subject: [PATCH] fq_codel: Fair Queue Codel AQM
-
-commit 4b549a2ef4bef9965d97cbd992ba67930cd3e0fe upstream.
-
-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");
projects / openwrt / svn-archive / archive.git / blobdiff