mirror of https://gitee.com/openkylin/linux.git
340 lines
6.9 KiB
C
340 lines
6.9 KiB
C
/*
|
|
* Copyright (c) 2016 Qualcomm Atheros, Inc
|
|
*
|
|
* GPL v2
|
|
*
|
|
* Based on net/sched/sch_fq_codel.c
|
|
*/
|
|
#ifndef __NET_SCHED_FQ_IMPL_H
|
|
#define __NET_SCHED_FQ_IMPL_H
|
|
|
|
#include <net/fq.h>
|
|
|
|
/* functions that are embedded into includer */
|
|
|
|
static void fq_adjust_removal(struct fq *fq,
|
|
struct fq_flow *flow,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct fq_tin *tin = flow->tin;
|
|
|
|
tin->backlog_bytes -= skb->len;
|
|
tin->backlog_packets--;
|
|
flow->backlog -= skb->len;
|
|
fq->backlog--;
|
|
fq->memory_usage -= skb->truesize;
|
|
}
|
|
|
|
static void fq_rejigger_backlog(struct fq *fq, struct fq_flow *flow)
|
|
{
|
|
struct fq_flow *i;
|
|
|
|
if (flow->backlog == 0) {
|
|
list_del_init(&flow->backlogchain);
|
|
} else {
|
|
i = flow;
|
|
|
|
list_for_each_entry_continue(i, &fq->backlogs, backlogchain)
|
|
if (i->backlog < flow->backlog)
|
|
break;
|
|
|
|
list_move_tail(&flow->backlogchain,
|
|
&i->backlogchain);
|
|
}
|
|
}
|
|
|
|
static struct sk_buff *fq_flow_dequeue(struct fq *fq,
|
|
struct fq_flow *flow)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
lockdep_assert_held(&fq->lock);
|
|
|
|
skb = __skb_dequeue(&flow->queue);
|
|
if (!skb)
|
|
return NULL;
|
|
|
|
fq_adjust_removal(fq, flow, skb);
|
|
fq_rejigger_backlog(fq, flow);
|
|
|
|
return skb;
|
|
}
|
|
|
|
static struct sk_buff *fq_tin_dequeue(struct fq *fq,
|
|
struct fq_tin *tin,
|
|
fq_tin_dequeue_t dequeue_func)
|
|
{
|
|
struct fq_flow *flow;
|
|
struct list_head *head;
|
|
struct sk_buff *skb;
|
|
|
|
lockdep_assert_held(&fq->lock);
|
|
|
|
begin:
|
|
head = &tin->new_flows;
|
|
if (list_empty(head)) {
|
|
head = &tin->old_flows;
|
|
if (list_empty(head))
|
|
return NULL;
|
|
}
|
|
|
|
flow = list_first_entry(head, struct fq_flow, flowchain);
|
|
|
|
if (flow->deficit <= 0) {
|
|
flow->deficit += fq->quantum;
|
|
list_move_tail(&flow->flowchain,
|
|
&tin->old_flows);
|
|
goto begin;
|
|
}
|
|
|
|
skb = dequeue_func(fq, tin, flow);
|
|
if (!skb) {
|
|
/* force a pass through old_flows to prevent starvation */
|
|
if ((head == &tin->new_flows) &&
|
|
!list_empty(&tin->old_flows)) {
|
|
list_move_tail(&flow->flowchain, &tin->old_flows);
|
|
} else {
|
|
list_del_init(&flow->flowchain);
|
|
flow->tin = NULL;
|
|
}
|
|
goto begin;
|
|
}
|
|
|
|
flow->deficit -= skb->len;
|
|
tin->tx_bytes += skb->len;
|
|
tin->tx_packets++;
|
|
|
|
return skb;
|
|
}
|
|
|
|
static u32 fq_flow_idx(struct fq *fq, struct sk_buff *skb)
|
|
{
|
|
u32 hash = skb_get_hash_perturb(skb, fq->perturbation);
|
|
|
|
return reciprocal_scale(hash, fq->flows_cnt);
|
|
}
|
|
|
|
static struct fq_flow *fq_flow_classify(struct fq *fq,
|
|
struct fq_tin *tin, u32 idx,
|
|
struct sk_buff *skb,
|
|
fq_flow_get_default_t get_default_func)
|
|
{
|
|
struct fq_flow *flow;
|
|
|
|
lockdep_assert_held(&fq->lock);
|
|
|
|
flow = &fq->flows[idx];
|
|
if (flow->tin && flow->tin != tin) {
|
|
flow = get_default_func(fq, tin, idx, skb);
|
|
tin->collisions++;
|
|
fq->collisions++;
|
|
}
|
|
|
|
if (!flow->tin)
|
|
tin->flows++;
|
|
|
|
return flow;
|
|
}
|
|
|
|
static void fq_recalc_backlog(struct fq *fq,
|
|
struct fq_tin *tin,
|
|
struct fq_flow *flow)
|
|
{
|
|
struct fq_flow *i;
|
|
|
|
if (list_empty(&flow->backlogchain))
|
|
list_add_tail(&flow->backlogchain, &fq->backlogs);
|
|
|
|
i = flow;
|
|
list_for_each_entry_continue_reverse(i, &fq->backlogs,
|
|
backlogchain)
|
|
if (i->backlog > flow->backlog)
|
|
break;
|
|
|
|
list_move(&flow->backlogchain, &i->backlogchain);
|
|
}
|
|
|
|
static void fq_tin_enqueue(struct fq *fq,
|
|
struct fq_tin *tin, u32 idx,
|
|
struct sk_buff *skb,
|
|
fq_skb_free_t free_func,
|
|
fq_flow_get_default_t get_default_func)
|
|
{
|
|
struct fq_flow *flow;
|
|
bool oom;
|
|
|
|
lockdep_assert_held(&fq->lock);
|
|
|
|
flow = fq_flow_classify(fq, tin, idx, skb, get_default_func);
|
|
|
|
flow->tin = tin;
|
|
flow->backlog += skb->len;
|
|
tin->backlog_bytes += skb->len;
|
|
tin->backlog_packets++;
|
|
fq->memory_usage += skb->truesize;
|
|
fq->backlog++;
|
|
|
|
fq_recalc_backlog(fq, tin, flow);
|
|
|
|
if (list_empty(&flow->flowchain)) {
|
|
flow->deficit = fq->quantum;
|
|
list_add_tail(&flow->flowchain,
|
|
&tin->new_flows);
|
|
}
|
|
|
|
__skb_queue_tail(&flow->queue, skb);
|
|
oom = (fq->memory_usage > fq->memory_limit);
|
|
while (fq->backlog > fq->limit || oom) {
|
|
flow = list_first_entry_or_null(&fq->backlogs,
|
|
struct fq_flow,
|
|
backlogchain);
|
|
if (!flow)
|
|
return;
|
|
|
|
skb = fq_flow_dequeue(fq, flow);
|
|
if (!skb)
|
|
return;
|
|
|
|
free_func(fq, flow->tin, flow, skb);
|
|
|
|
flow->tin->overlimit++;
|
|
fq->overlimit++;
|
|
if (oom) {
|
|
fq->overmemory++;
|
|
oom = (fq->memory_usage > fq->memory_limit);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void fq_flow_filter(struct fq *fq,
|
|
struct fq_flow *flow,
|
|
fq_skb_filter_t filter_func,
|
|
void *filter_data,
|
|
fq_skb_free_t free_func)
|
|
{
|
|
struct fq_tin *tin = flow->tin;
|
|
struct sk_buff *skb, *tmp;
|
|
|
|
lockdep_assert_held(&fq->lock);
|
|
|
|
skb_queue_walk_safe(&flow->queue, skb, tmp) {
|
|
if (!filter_func(fq, tin, flow, skb, filter_data))
|
|
continue;
|
|
|
|
__skb_unlink(skb, &flow->queue);
|
|
fq_adjust_removal(fq, flow, skb);
|
|
free_func(fq, tin, flow, skb);
|
|
}
|
|
|
|
fq_rejigger_backlog(fq, flow);
|
|
}
|
|
|
|
static void fq_tin_filter(struct fq *fq,
|
|
struct fq_tin *tin,
|
|
fq_skb_filter_t filter_func,
|
|
void *filter_data,
|
|
fq_skb_free_t free_func)
|
|
{
|
|
struct fq_flow *flow;
|
|
|
|
lockdep_assert_held(&fq->lock);
|
|
|
|
list_for_each_entry(flow, &tin->new_flows, flowchain)
|
|
fq_flow_filter(fq, flow, filter_func, filter_data, free_func);
|
|
list_for_each_entry(flow, &tin->old_flows, flowchain)
|
|
fq_flow_filter(fq, flow, filter_func, filter_data, free_func);
|
|
}
|
|
|
|
static void fq_flow_reset(struct fq *fq,
|
|
struct fq_flow *flow,
|
|
fq_skb_free_t free_func)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = fq_flow_dequeue(fq, flow)))
|
|
free_func(fq, flow->tin, flow, skb);
|
|
|
|
if (!list_empty(&flow->flowchain))
|
|
list_del_init(&flow->flowchain);
|
|
|
|
if (!list_empty(&flow->backlogchain))
|
|
list_del_init(&flow->backlogchain);
|
|
|
|
flow->tin = NULL;
|
|
|
|
WARN_ON_ONCE(flow->backlog);
|
|
}
|
|
|
|
static void fq_tin_reset(struct fq *fq,
|
|
struct fq_tin *tin,
|
|
fq_skb_free_t free_func)
|
|
{
|
|
struct list_head *head;
|
|
struct fq_flow *flow;
|
|
|
|
for (;;) {
|
|
head = &tin->new_flows;
|
|
if (list_empty(head)) {
|
|
head = &tin->old_flows;
|
|
if (list_empty(head))
|
|
break;
|
|
}
|
|
|
|
flow = list_first_entry(head, struct fq_flow, flowchain);
|
|
fq_flow_reset(fq, flow, free_func);
|
|
}
|
|
|
|
WARN_ON_ONCE(tin->backlog_bytes);
|
|
WARN_ON_ONCE(tin->backlog_packets);
|
|
}
|
|
|
|
static void fq_flow_init(struct fq_flow *flow)
|
|
{
|
|
INIT_LIST_HEAD(&flow->flowchain);
|
|
INIT_LIST_HEAD(&flow->backlogchain);
|
|
__skb_queue_head_init(&flow->queue);
|
|
}
|
|
|
|
static void fq_tin_init(struct fq_tin *tin)
|
|
{
|
|
INIT_LIST_HEAD(&tin->new_flows);
|
|
INIT_LIST_HEAD(&tin->old_flows);
|
|
}
|
|
|
|
static int fq_init(struct fq *fq, int flows_cnt)
|
|
{
|
|
int i;
|
|
|
|
memset(fq, 0, sizeof(fq[0]));
|
|
INIT_LIST_HEAD(&fq->backlogs);
|
|
spin_lock_init(&fq->lock);
|
|
fq->flows_cnt = max_t(u32, flows_cnt, 1);
|
|
fq->perturbation = prandom_u32();
|
|
fq->quantum = 300;
|
|
fq->limit = 8192;
|
|
fq->memory_limit = 16 << 20; /* 16 MBytes */
|
|
|
|
fq->flows = kcalloc(fq->flows_cnt, sizeof(fq->flows[0]), GFP_KERNEL);
|
|
if (!fq->flows)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < fq->flows_cnt; i++)
|
|
fq_flow_init(&fq->flows[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void fq_reset(struct fq *fq,
|
|
fq_skb_free_t free_func)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < fq->flows_cnt; i++)
|
|
fq_flow_reset(fq, &fq->flows[i], free_func);
|
|
|
|
kfree(fq->flows);
|
|
fq->flows = NULL;
|
|
}
|
|
|
|
#endif
|