net_sched: red: split red_parms into parms and vars
This patch splits the red_parms structure into two components.
One holding the RED 'constant' parameters, and one containing the
variables.
This permits a size reduction of GRED qdisc, and is a preliminary step
to add an optional RED unit to SFQ.
SFQRED will have a single red_parms structure shared by all flows, and a
private red_vars per flow.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Dave Taht <dave.taht@gmail.com>
CC: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index bef00ac..e465064 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -57,6 +57,7 @@
struct red_parms parms;
/* Variables */
+ struct red_vars vars;
struct tcf_proto *filter_list;
struct {
u32 prob_drop; /* Early probability drops */
@@ -265,7 +266,7 @@
static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
struct choke_sched_data *q = qdisc_priv(sch);
- struct red_parms *p = &q->parms;
+ const struct red_parms *p = &q->parms;
int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
if (q->filter_list) {
@@ -276,13 +277,13 @@
choke_skb_cb(skb)->keys_valid = 0;
/* Compute average queue usage (see RED) */
- p->qavg = red_calc_qavg(p, sch->q.qlen);
- if (red_is_idling(p))
- red_end_of_idle_period(p);
+ q->vars.qavg = red_calc_qavg(p, &q->vars, sch->q.qlen);
+ if (red_is_idling(&q->vars))
+ red_end_of_idle_period(&q->vars);
/* Is queue small? */
- if (p->qavg <= p->qth_min)
- p->qcount = -1;
+ if (q->vars.qavg <= p->qth_min)
+ q->vars.qcount = -1;
else {
unsigned int idx;
@@ -294,8 +295,8 @@
}
/* Queue is large, always mark/drop */
- if (p->qavg > p->qth_max) {
- p->qcount = -1;
+ if (q->vars.qavg > p->qth_max) {
+ q->vars.qcount = -1;
sch->qstats.overlimits++;
if (use_harddrop(q) || !use_ecn(q) ||
@@ -305,10 +306,10 @@
}
q->stats.forced_mark++;
- } else if (++p->qcount) {
- if (red_mark_probability(p, p->qavg)) {
- p->qcount = 0;
- p->qR = red_random(p);
+ } else if (++q->vars.qcount) {
+ if (red_mark_probability(p, &q->vars, q->vars.qavg)) {
+ q->vars.qcount = 0;
+ q->vars.qR = red_random(p);
sch->qstats.overlimits++;
if (!use_ecn(q) || !INET_ECN_set_ce(skb)) {
@@ -319,7 +320,7 @@
q->stats.prob_mark++;
}
} else
- p->qR = red_random(p);
+ q->vars.qR = red_random(p);
}
/* Admit new packet */
@@ -353,8 +354,8 @@
struct sk_buff *skb;
if (q->head == q->tail) {
- if (!red_is_idling(&q->parms))
- red_start_of_idle_period(&q->parms);
+ if (!red_is_idling(&q->vars))
+ red_start_of_idle_period(&q->vars);
return NULL;
}
@@ -377,8 +378,8 @@
if (len > 0)
q->stats.other++;
else {
- if (!red_is_idling(&q->parms))
- red_start_of_idle_period(&q->parms);
+ if (!red_is_idling(&q->vars))
+ red_start_of_idle_period(&q->vars);
}
return len;
@@ -388,7 +389,7 @@
{
struct choke_sched_data *q = qdisc_priv(sch);
- red_restart(&q->parms);
+ red_restart(&q->vars);
}
static const struct nla_policy choke_policy[TCA_CHOKE_MAX + 1] = {
@@ -482,9 +483,10 @@
ctl->Plog, ctl->Scell_log,
nla_data(tb[TCA_CHOKE_STAB]),
max_P);
+ red_set_vars(&q->vars);
if (q->head == q->tail)
- red_end_of_idle_period(&q->parms);
+ red_end_of_idle_period(&q->vars);
sch_tree_unlock(sch);
choke_free(old);