diff options
| -rw-r--r-- | include/linux/pkt_sched.h | 9 | ||||
| -rw-r--r-- | net/sched/sch_netem.c | 54 |
2 files changed, 50 insertions, 13 deletions
diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h index 73d84c071cb..1d9da36eb9d 100644 --- a/include/linux/pkt_sched.h +++ b/include/linux/pkt_sched.h @@ -427,6 +427,7 @@ enum TCA_NETEM_UNSPEC, TCA_NETEM_CORR, TCA_NETEM_DELAY_DIST, + TCA_NETEM_REORDER, __TCA_NETEM_MAX, }; @@ -437,7 +438,7 @@ struct tc_netem_qopt __u32 latency; /* added delay (us) */ __u32 limit; /* fifo limit (packets) */ __u32 loss; /* random packet loss (0=none ~0=100%) */ - __u32 gap; /* re-ordering gap (0 for delay all) */ + __u32 gap; /* re-ordering gap (0 for none) */ __u32 duplicate; /* random packet dup (0=none ~0=100%) */ __u32 jitter; /* random jitter in latency (us) */ }; @@ -449,6 +450,12 @@ struct tc_netem_corr __u32 dup_corr; /* duplicate correlation */ }; +struct tc_netem_reorder +{ + __u32 probability; + __u32 correlation; +}; + #define NETEM_DIST_SCALE 8192 #endif diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 48360f7eec5..bb9bf8d5003 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -62,11 +62,12 @@ struct netem_sched_data { u32 gap; u32 jitter; u32 duplicate; + u32 reorder; struct crndstate { unsigned long last; unsigned long rho; - } delay_cor, loss_cor, dup_cor; + } delay_cor, loss_cor, dup_cor, reorder_cor; struct disttable { u32 size; @@ -180,23 +181,23 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch) q->duplicate = dupsave; } - /* - * Do re-ordering by putting one out of N packets at the front - * of the queue. - * gap == 0 is special case for no-reordering. - */ - if (q->gap == 0 || q->counter != q->gap) { + if (q->gap == 0 /* not doing reordering */ + || q->counter < q->gap /* inside last reordering gap */ + || q->reorder < get_crandom(&q->reorder_cor)) { psched_time_t now; PSCHED_GET_TIME(now); - PSCHED_TADD2(now, - tabledist(q->latency, q->jitter, &q->delay_cor, q->delay_dist), + PSCHED_TADD2(now, tabledist(q->latency, q->jitter, + &q->delay_cor, q->delay_dist), cb->time_to_send); - ++q->counter; ret = q->qdisc->enqueue(skb, q->qdisc); } else { - q->counter = 0; + /* + * Do re-ordering by putting one out of N packets at the front + * of the queue. + */ PSCHED_GET_TIME(cb->time_to_send); + q->counter = 0; ret = q->qdisc->ops->requeue(skb, q->qdisc); } @@ -351,6 +352,19 @@ static int get_correlation(struct Qdisc *sch, const struct rtattr *attr) return 0; } +static int get_reorder(struct Qdisc *sch, const struct rtattr *attr) +{ + struct netem_sched_data *q = qdisc_priv(sch); + const struct tc_netem_reorder *r = RTA_DATA(attr); + + if (RTA_PAYLOAD(attr) != sizeof(*r)) + return -EINVAL; + + q->reorder = r->probability; + init_crandom(&q->reorder_cor, r->correlation); + return 0; +} + static int netem_change(struct Qdisc *sch, struct rtattr *opt) { struct netem_sched_data *q = qdisc_priv(sch); @@ -371,9 +385,15 @@ static int netem_change(struct Qdisc *sch, struct rtattr *opt) q->jitter = qopt->jitter; q->limit = qopt->limit; q->gap = qopt->gap; + q->counter = 0; q->loss = qopt->loss; q->duplicate = qopt->duplicate; + /* for compatiablity with earlier versions. + * if gap is set, need to assume 100% probablity + */ + q->reorder = ~0; + /* Handle nested options after initial queue options. * Should have put all options in nested format but too late now. */ @@ -395,6 +415,11 @@ static int netem_change(struct Qdisc *sch, struct rtattr *opt) if (ret) return ret; } + if (tb[TCA_NETEM_REORDER-1]) { + ret = get_reorder(sch, tb[TCA_NETEM_REORDER-1]); + if (ret) + return ret; + } } @@ -412,7 +437,6 @@ static int netem_init(struct Qdisc *sch, struct rtattr *opt) init_timer(&q->timer); q->timer.function = netem_watchdog; q->timer.data = (unsigned long) sch; - q->counter = 0; q->qdisc = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops); if (!q->qdisc) { @@ -444,6 +468,7 @@ static int netem_dump(struct Qdisc *sch, struct sk_buff *skb) struct rtattr *rta = (struct rtattr *) b; struct tc_netem_qopt qopt; struct tc_netem_corr cor; + struct tc_netem_reorder reorder; qopt.latency = q->latency; qopt.jitter = q->jitter; @@ -457,6 +482,11 @@ static int netem_dump(struct Qdisc *sch, struct sk_buff *skb) cor.loss_corr = q->loss_cor.rho; cor.dup_corr = q->dup_cor.rho; RTA_PUT(skb, TCA_NETEM_CORR, sizeof(cor), &cor); + + reorder.probability = q->reorder; + reorder.correlation = q->reorder_cor.rho; + RTA_PUT(skb, TCA_NETEM_REORDER, sizeof(reorder), &reorder); + rta->rta_len = skb->tail - b; return skb->len; |