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net: sched: implement qstat helper routines
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This adds helpers to manipulate qstats logic and replaces locations
that touch the counters directly. This simplifies future patches
to push qstats onto per cpu counters.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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John Fastabend authored and David S. Miller committed Sep 30, 2014
1 parent 22e0f8b commit 25331d6
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Showing 25 changed files with 108 additions and 81 deletions.
39 changes: 33 additions & 6 deletions include/net/sch_generic.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -521,11 +521,38 @@ static inline void qdisc_bstats_update(struct Qdisc *sch,
bstats_update(&sch->bstats, skb);
}

static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
const struct sk_buff *skb)
{
sch->qstats.backlog -= qdisc_pkt_len(skb);
}

static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
const struct sk_buff *skb)
{
sch->qstats.backlog += qdisc_pkt_len(skb);
}

static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
{
sch->qstats.drops += count;
}

static inline void qdisc_qstats_drop(struct Qdisc *sch)
{
sch->qstats.drops++;
}

static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
{
sch->qstats.overlimits++;
}

static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff_head *list)
{
__skb_queue_tail(list, skb);
sch->qstats.backlog += qdisc_pkt_len(skb);
qdisc_qstats_backlog_inc(sch, skb);

return NET_XMIT_SUCCESS;
}
Expand All @@ -541,7 +568,7 @@ static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
struct sk_buff *skb = __skb_dequeue(list);

if (likely(skb != NULL)) {
sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_backlog_dec(sch, skb);
qdisc_bstats_update(sch, skb);
}

Expand All @@ -560,7 +587,7 @@ static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,

if (likely(skb != NULL)) {
unsigned int len = qdisc_pkt_len(skb);
sch->qstats.backlog -= len;
qdisc_qstats_backlog_dec(sch, skb);
kfree_skb(skb);
return len;
}
Expand All @@ -579,7 +606,7 @@ static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
struct sk_buff *skb = __skb_dequeue_tail(list);

if (likely(skb != NULL))
sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_backlog_dec(sch, skb);

return skb;
}
Expand Down Expand Up @@ -661,14 +688,14 @@ static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
{
kfree_skb(skb);
sch->qstats.drops++;
qdisc_qstats_drop(sch);

return NET_XMIT_DROP;
}

static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
{
sch->qstats.drops++;
qdisc_qstats_drop(sch);

#ifdef CONFIG_NET_CLS_ACT
if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
Expand Down
2 changes: 1 addition & 1 deletion net/sched/sch_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -763,7 +763,7 @@ void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
cops->put(sch, cl);
}
sch->q.qlen -= n;
sch->qstats.drops += drops;
__qdisc_qstats_drop(sch, drops);
}
}
EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
Expand Down
2 changes: 1 addition & 1 deletion net/sched/sch_atm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -417,7 +417,7 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
if (ret != NET_XMIT_SUCCESS) {
drop: __maybe_unused
if (net_xmit_drop_count(ret)) {
sch->qstats.drops++;
qdisc_qstats_drop(sch);
if (flow)
flow->qstats.drops++;
}
Expand Down
10 changes: 5 additions & 5 deletions net/sched/sch_cbq.c
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Original file line number Diff line number Diff line change
Expand Up @@ -377,7 +377,7 @@ cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
#endif
if (cl == NULL) {
if (ret & __NET_XMIT_BYPASS)
sch->qstats.drops++;
qdisc_qstats_drop(sch);
kfree_skb(skb);
return ret;
}
Expand All @@ -395,7 +395,7 @@ cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
}

if (net_xmit_drop_count(ret)) {
sch->qstats.drops++;
qdisc_qstats_drop(sch);
cbq_mark_toplevel(q, cl);
cl->qstats.drops++;
}
Expand Down Expand Up @@ -650,11 +650,11 @@ static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child)
return 0;
}
if (net_xmit_drop_count(ret))
sch->qstats.drops++;
qdisc_qstats_drop(sch);
return 0;
}

sch->qstats.drops++;
qdisc_qstats_drop(sch);
return -1;
}
#endif
Expand Down Expand Up @@ -995,7 +995,7 @@ cbq_dequeue(struct Qdisc *sch)
*/

if (sch->q.qlen) {
sch->qstats.overlimits++;
qdisc_qstats_overlimit(sch);
if (q->wd_expires)
qdisc_watchdog_schedule(&q->watchdog,
now + q->wd_expires);
Expand Down
14 changes: 7 additions & 7 deletions net/sched/sch_choke.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -127,7 +127,7 @@ static void choke_drop_by_idx(struct Qdisc *sch, unsigned int idx)
if (idx == q->tail)
choke_zap_tail_holes(q);

sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_backlog_dec(sch, skb);
qdisc_drop(skb, sch);
qdisc_tree_decrease_qlen(sch, 1);
--sch->q.qlen;
Expand Down Expand Up @@ -302,7 +302,7 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch)
if (q->vars.qavg > p->qth_max) {
q->vars.qcount = -1;

sch->qstats.overlimits++;
qdisc_qstats_overlimit(sch);
if (use_harddrop(q) || !use_ecn(q) ||
!INET_ECN_set_ce(skb)) {
q->stats.forced_drop++;
Expand All @@ -315,7 +315,7 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch)
q->vars.qcount = 0;
q->vars.qR = red_random(p);

sch->qstats.overlimits++;
qdisc_qstats_overlimit(sch);
if (!use_ecn(q) || !INET_ECN_set_ce(skb)) {
q->stats.prob_drop++;
goto congestion_drop;
Expand All @@ -332,7 +332,7 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch)
q->tab[q->tail] = skb;
q->tail = (q->tail + 1) & q->tab_mask;
++sch->q.qlen;
sch->qstats.backlog += qdisc_pkt_len(skb);
qdisc_qstats_backlog_inc(sch, skb);
return NET_XMIT_SUCCESS;
}

Expand All @@ -345,7 +345,7 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch)

other_drop:
if (ret & __NET_XMIT_BYPASS)
sch->qstats.drops++;
qdisc_qstats_drop(sch);
kfree_skb(skb);
return ret;
}
Expand All @@ -365,7 +365,7 @@ static struct sk_buff *choke_dequeue(struct Qdisc *sch)
q->tab[q->head] = NULL;
choke_zap_head_holes(q);
--sch->q.qlen;
sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_backlog_dec(sch, skb);
qdisc_bstats_update(sch, skb);

return skb;
Expand Down Expand Up @@ -460,7 +460,7 @@ static int choke_change(struct Qdisc *sch, struct nlattr *opt)
ntab[tail++] = skb;
continue;
}
sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_backlog_dec(sch, skb);
--sch->q.qlen;
qdisc_drop(skb, sch);
}
Expand Down
2 changes: 1 addition & 1 deletion net/sched/sch_codel.c
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Original file line number Diff line number Diff line change
Expand Up @@ -149,7 +149,7 @@ static int codel_change(struct Qdisc *sch, struct nlattr *opt)
while (sch->q.qlen > sch->limit) {
struct sk_buff *skb = __skb_dequeue(&sch->q);

sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_backlog_dec(sch, skb);
qdisc_drop(skb, sch);
}
qdisc_tree_decrease_qlen(sch, qlen - sch->q.qlen);
Expand Down
4 changes: 2 additions & 2 deletions net/sched/sch_drr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -360,7 +360,7 @@ static int drr_enqueue(struct sk_buff *skb, struct Qdisc *sch)
cl = drr_classify(skb, sch, &err);
if (cl == NULL) {
if (err & __NET_XMIT_BYPASS)
sch->qstats.drops++;
qdisc_qstats_drop(sch);
kfree_skb(skb);
return err;
}
Expand All @@ -369,7 +369,7 @@ static int drr_enqueue(struct sk_buff *skb, struct Qdisc *sch)
if (unlikely(err != NET_XMIT_SUCCESS)) {
if (net_xmit_drop_count(err)) {
cl->qstats.drops++;
sch->qstats.drops++;
qdisc_qstats_drop(sch);
}
return err;
}
Expand Down
2 changes: 1 addition & 1 deletion net/sched/sch_dsmark.c
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Original file line number Diff line number Diff line change
Expand Up @@ -258,7 +258,7 @@ static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
err = qdisc_enqueue(skb, p->q);
if (err != NET_XMIT_SUCCESS) {
if (net_xmit_drop_count(err))
sch->qstats.drops++;
qdisc_qstats_drop(sch);
return err;
}

Expand Down
2 changes: 1 addition & 1 deletion net/sched/sch_fifo.c
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,7 @@ static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch)

/* queue full, remove one skb to fulfill the limit */
__qdisc_queue_drop_head(sch, &sch->q);
sch->qstats.drops++;
qdisc_qstats_drop(sch);
qdisc_enqueue_tail(skb, sch);

return NET_XMIT_CN;
Expand Down
4 changes: 2 additions & 2 deletions net/sched/sch_fq.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -290,7 +290,7 @@ static struct sk_buff *fq_dequeue_head(struct Qdisc *sch, struct fq_flow *flow)
flow->head = skb->next;
skb->next = NULL;
flow->qlen--;
sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_backlog_dec(sch, skb);
sch->q.qlen--;
}
return skb;
Expand Down Expand Up @@ -371,7 +371,7 @@ static int fq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
f->qlen++;
if (skb_is_retransmit(skb))
q->stat_tcp_retrans++;
sch->qstats.backlog += qdisc_pkt_len(skb);
qdisc_qstats_backlog_inc(sch, skb);
if (fq_flow_is_detached(f)) {
fq_flow_add_tail(&q->new_flows, f);
if (time_after(jiffies, f->age + q->flow_refill_delay))
Expand Down
8 changes: 4 additions & 4 deletions net/sched/sch_fq_codel.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -164,8 +164,8 @@ static unsigned int fq_codel_drop(struct Qdisc *sch)
q->backlogs[idx] -= len;
kfree_skb(skb);
sch->q.qlen--;
sch->qstats.drops++;
sch->qstats.backlog -= len;
qdisc_qstats_drop(sch);
qdisc_qstats_backlog_dec(sch, skb);
flow->dropped++;
return idx;
}
Expand All @@ -180,7 +180,7 @@ static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch)
idx = fq_codel_classify(skb, sch, &ret);
if (idx == 0) {
if (ret & __NET_XMIT_BYPASS)
sch->qstats.drops++;
qdisc_qstats_drop(sch);
kfree_skb(skb);
return ret;
}
Expand All @@ -190,7 +190,7 @@ static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch)
flow = &q->flows[idx];
flow_queue_add(flow, skb);
q->backlogs[idx] += qdisc_pkt_len(skb);
sch->qstats.backlog += qdisc_pkt_len(skb);
qdisc_qstats_backlog_inc(sch, skb);

if (list_empty(&flow->flowchain)) {
list_add_tail(&flow->flowchain, &q->new_flows);
Expand Down
4 changes: 2 additions & 2 deletions net/sched/sch_gred.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -209,7 +209,7 @@ static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch)
break;

case RED_PROB_MARK:
sch->qstats.overlimits++;
qdisc_qstats_overlimit(sch);
if (!gred_use_ecn(t) || !INET_ECN_set_ce(skb)) {
q->stats.prob_drop++;
goto congestion_drop;
Expand All @@ -219,7 +219,7 @@ static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch)
break;

case RED_HARD_MARK:
sch->qstats.overlimits++;
qdisc_qstats_overlimit(sch);
if (gred_use_harddrop(t) || !gred_use_ecn(t) ||
!INET_ECN_set_ce(skb)) {
q->stats.forced_drop++;
Expand Down
8 changes: 4 additions & 4 deletions net/sched/sch_hfsc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1591,7 +1591,7 @@ hfsc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
cl = hfsc_classify(skb, sch, &err);
if (cl == NULL) {
if (err & __NET_XMIT_BYPASS)
sch->qstats.drops++;
qdisc_qstats_drop(sch);
kfree_skb(skb);
return err;
}
Expand All @@ -1600,7 +1600,7 @@ hfsc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
if (unlikely(err != NET_XMIT_SUCCESS)) {
if (net_xmit_drop_count(err)) {
cl->qstats.drops++;
sch->qstats.drops++;
qdisc_qstats_drop(sch);
}
return err;
}
Expand Down Expand Up @@ -1643,7 +1643,7 @@ hfsc_dequeue(struct Qdisc *sch)
*/
cl = vttree_get_minvt(&q->root, cur_time);
if (cl == NULL) {
sch->qstats.overlimits++;
qdisc_qstats_overlimit(sch);
hfsc_schedule_watchdog(sch);
return NULL;
}
Expand Down Expand Up @@ -1698,7 +1698,7 @@ hfsc_drop(struct Qdisc *sch)
list_move_tail(&cl->dlist, &q->droplist);
}
cl->qstats.drops++;
sch->qstats.drops++;
qdisc_qstats_drop(sch);
sch->q.qlen--;
return len;
}
Expand Down
8 changes: 4 additions & 4 deletions net/sched/sch_hhf.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -376,8 +376,8 @@ static unsigned int hhf_drop(struct Qdisc *sch)
struct sk_buff *skb = dequeue_head(bucket);

sch->q.qlen--;
sch->qstats.drops++;
sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_drop(sch);
qdisc_qstats_backlog_dec(sch, skb);
kfree_skb(skb);
}

Expand All @@ -395,7 +395,7 @@ static int hhf_enqueue(struct sk_buff *skb, struct Qdisc *sch)

bucket = &q->buckets[idx];
bucket_add(bucket, skb);
sch->qstats.backlog += qdisc_pkt_len(skb);
qdisc_qstats_backlog_inc(sch, skb);

if (list_empty(&bucket->bucketchain)) {
unsigned int weight;
Expand Down Expand Up @@ -457,7 +457,7 @@ static struct sk_buff *hhf_dequeue(struct Qdisc *sch)
if (bucket->head) {
skb = dequeue_head(bucket);
sch->q.qlen--;
sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_qstats_backlog_dec(sch, skb);
}

if (!skb) {
Expand Down
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