diff options
| -rw-r--r-- | net/sched/sch_gred.c | 87 |
1 files changed, 65 insertions, 22 deletions
diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c index 25c171c3271..4ced47bf608 100644 --- a/net/sched/sch_gred.c +++ b/net/sched/sch_gred.c @@ -91,16 +91,57 @@ struct gred_sched_data psched_time_t qidlestart; /* Start of idle period */ }; +enum { + GRED_WRED_MODE = 1, +}; + struct gred_sched { struct gred_sched_data *tab[MAX_DPs]; + unsigned long flags; u32 DPs; u32 def; u8 initd; u8 grio; - u8 eqp; }; +static inline int gred_wred_mode(struct gred_sched *table) +{ + return test_bit(GRED_WRED_MODE, &table->flags); +} + +static inline void gred_enable_wred_mode(struct gred_sched *table) +{ + __set_bit(GRED_WRED_MODE, &table->flags); +} + +static inline void gred_disable_wred_mode(struct gred_sched *table) +{ + __clear_bit(GRED_WRED_MODE, &table->flags); +} + +static inline int gred_wred_mode_check(struct Qdisc *sch) +{ + struct gred_sched *table = qdisc_priv(sch); + int i; + + /* Really ugly O(n^2) but shouldn't be necessary too frequent. */ + for (i = 0; i < table->DPs; i++) { + struct gred_sched_data *q = table->tab[i]; + int n; + + if (q == NULL) + continue; + + for (n = 0; n < table->DPs; n++) + if (table->tab[n] && table->tab[n] != q && + table->tab[n]->prio == q->prio) + return 1; + } + + return 0; +} + static int gred_enqueue(struct sk_buff *skb, struct Qdisc* sch) { @@ -132,7 +173,7 @@ gred_enqueue(struct sk_buff *skb, struct Qdisc* sch) "general backlog %d\n",skb->tc_index&0xf,sch->handle,q->backlog, sch->qstats.backlog); /* sum up all the qaves of prios <= to ours to get the new qave*/ - if (!t->eqp && t->grio) { + if (!gred_wred_mode(t) && t->grio) { for (i=0;i<t->DPs;i++) { if ((!t->tab[i]) || (i==q->DP)) continue; @@ -146,7 +187,7 @@ gred_enqueue(struct sk_buff *skb, struct Qdisc* sch) q->packetsin++; q->bytesin+=skb->len; - if (t->eqp && t->grio) { + if (gred_wred_mode(t)) { qave=0; q->qave=t->tab[t->def]->qave; q->qidlestart=t->tab[t->def]->qidlestart; @@ -160,7 +201,7 @@ gred_enqueue(struct sk_buff *skb, struct Qdisc* sch) q->qave >>= q->Stab[(us_idle>>q->Scell_log)&0xFF]; } else { - if (t->eqp) { + if (gred_wred_mode(t)) { q->qave += sch->qstats.backlog - (q->qave >> q->Wlog); } else { q->qave += q->backlog - (q->qave >> q->Wlog); @@ -169,7 +210,7 @@ gred_enqueue(struct sk_buff *skb, struct Qdisc* sch) } - if (t->eqp && t->grio) + if (gred_wred_mode(t)) t->tab[t->def]->qave=q->qave; if ((q->qave+qave) < q->qth_min) { @@ -240,7 +281,7 @@ gred_dequeue(struct Qdisc* sch) q= t->tab[(skb->tc_index&0xf)]; if (q) { q->backlog -= skb->len; - if (!q->backlog && !t->eqp) + if (!q->backlog && !gred_wred_mode(t)) PSCHED_GET_TIME(q->qidlestart); } else { D2PRINTK("gred_dequeue: skb has bad tcindex %x\n",skb->tc_index&0xf); @@ -248,7 +289,7 @@ gred_dequeue(struct Qdisc* sch) return skb; } - if (t->eqp) { + if (gred_wred_mode(t)) { q= t->tab[t->def]; if (!q) D2PRINTK("no default VQ set: Results will be " @@ -276,7 +317,7 @@ static unsigned int gred_drop(struct Qdisc* sch) if (q) { q->backlog -= len; q->other++; - if (!q->backlog && !t->eqp) + if (!q->backlog && !gred_wred_mode(t)) PSCHED_GET_TIME(q->qidlestart); } else { D2PRINTK("gred_dequeue: skb has bad tcindex %x\n",skb->tc_index&0xf); @@ -330,7 +371,6 @@ static int gred_change(struct Qdisc *sch, struct rtattr *opt) struct tc_gred_sopt *sopt; struct rtattr *tb[TCA_GRED_STAB]; struct rtattr *tb2[TCA_GRED_DPS]; - int i; if (opt == NULL || rtattr_parse_nested(tb, TCA_GRED_STAB, opt)) return -EINVAL; @@ -344,7 +384,17 @@ static int gred_change(struct Qdisc *sch, struct rtattr *opt) sopt = RTA_DATA(tb2[TCA_GRED_DPS-1]); table->DPs=sopt->DPs; table->def=sopt->def_DP; - table->grio=sopt->grio; + + if (sopt->grio) { + table->grio = 1; + gred_disable_wred_mode(table); + if (gred_wred_mode_check(sch)) + gred_enable_wred_mode(table); + } else { + table->grio = 0; + gred_disable_wred_mode(table); + } + table->initd=0; /* probably need to clear all the table DP entries as well */ return 0; @@ -413,17 +463,10 @@ static int gred_change(struct Qdisc *sch, struct rtattr *opt) PSCHED_SET_PASTPERFECT(q->qidlestart); memcpy(q->Stab, RTA_DATA(tb[TCA_GRED_STAB-1]), 256); - if ( table->initd && table->grio) { - /* this looks ugly but it's not in the fast path */ - for (i=0;i<table->DPs;i++) { - if ((!table->tab[i]) || (i==q->DP) ) - continue; - if (table->tab[i]->prio == q->prio ){ - /* WRED mode detected */ - table->eqp=1; - break; - } - } + if (table->grio) { + gred_disable_wred_mode(table); + if (gred_wred_mode_check(sch)) + gred_enable_wred_mode(table); } if (!table->initd) { @@ -541,7 +584,7 @@ static int gred_dump(struct Qdisc *sch, struct sk_buff *skb) dst->DP=q->DP; dst->backlog=q->backlog; if (q->qave) { - if (table->eqp && table->grio) { + if (gred_wred_mode(table)) { q->qidlestart=table->tab[table->def]->qidlestart; q->qave=table->tab[table->def]->qave; } |