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[PKT_SCHED]: Convert sch_red to a classful qdisc
Convert sch_red to a classful qdisc. All qdiscs that maintain accurate backlog counters are eligible as child qdiscs. When a queue limit larger than zero is given, a bfifo qdisc is used for backwards compatibility. Current versions of tc enforce a limit larger than zero, other users can avoid creating the default qdisc by using zero. Signed-off-by: Patrick McHardy <kaber@trash.net> Acked-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
David S. Miller
parent
a70fcb0ba3
commit
f38c39d6ce
@ -44,6 +44,7 @@ struct red_sched_data
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unsigned char flags;
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struct red_parms parms;
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struct red_stats stats;
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struct Qdisc *qdisc;
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};
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static inline int red_use_ecn(struct red_sched_data *q)
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@ -59,8 +60,10 @@ static inline int red_use_harddrop(struct red_sched_data *q)
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static int red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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struct Qdisc *child = q->qdisc;
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int ret;
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q->parms.qavg = red_calc_qavg(&q->parms, sch->qstats.backlog);
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q->parms.qavg = red_calc_qavg(&q->parms, child->qstats.backlog);
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if (red_is_idling(&q->parms))
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red_end_of_idle_period(&q->parms);
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@ -91,11 +94,16 @@ static int red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
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break;
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}
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if (sch->qstats.backlog + skb->len <= q->limit)
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return qdisc_enqueue_tail(skb, sch);
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q->stats.pdrop++;
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return qdisc_drop(skb, sch);
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ret = child->enqueue(skb, child);
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if (likely(ret == NET_XMIT_SUCCESS)) {
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sch->bstats.bytes += skb->len;
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sch->bstats.packets++;
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sch->q.qlen++;
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} else {
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q->stats.pdrop++;
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sch->qstats.drops++;
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}
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return ret;
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congestion_drop:
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qdisc_drop(skb, sch);
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@ -105,21 +113,30 @@ congestion_drop:
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static int red_requeue(struct sk_buff *skb, struct Qdisc* sch)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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struct Qdisc *child = q->qdisc;
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int ret;
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if (red_is_idling(&q->parms))
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red_end_of_idle_period(&q->parms);
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return qdisc_requeue(skb, sch);
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ret = child->ops->requeue(skb, child);
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if (likely(ret == NET_XMIT_SUCCESS)) {
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sch->qstats.requeues++;
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sch->q.qlen++;
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}
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return ret;
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}
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static struct sk_buff * red_dequeue(struct Qdisc* sch)
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{
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struct sk_buff *skb;
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struct red_sched_data *q = qdisc_priv(sch);
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struct Qdisc *child = q->qdisc;
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skb = qdisc_dequeue_head(sch);
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if (skb == NULL && !red_is_idling(&q->parms))
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skb = child->dequeue(child);
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if (skb)
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sch->q.qlen--;
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else if (!red_is_idling(&q->parms))
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red_start_of_idle_period(&q->parms);
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return skb;
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@ -127,14 +144,14 @@ static struct sk_buff * red_dequeue(struct Qdisc* sch)
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static unsigned int red_drop(struct Qdisc* sch)
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{
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struct sk_buff *skb;
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struct red_sched_data *q = qdisc_priv(sch);
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struct Qdisc *child = q->qdisc;
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unsigned int len;
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skb = qdisc_dequeue_tail(sch);
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if (skb) {
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unsigned int len = skb->len;
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if (child->ops->drop && (len = child->ops->drop(child)) > 0) {
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q->stats.other++;
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qdisc_drop(skb, sch);
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sch->qstats.drops++;
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sch->q.qlen--;
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return len;
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}
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@ -148,15 +165,48 @@ static void red_reset(struct Qdisc* sch)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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qdisc_reset_queue(sch);
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qdisc_reset(q->qdisc);
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sch->q.qlen = 0;
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red_restart(&q->parms);
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}
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static void red_destroy(struct Qdisc *sch)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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qdisc_destroy(q->qdisc);
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}
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static struct Qdisc *red_create_dflt(struct net_device *dev, u32 limit)
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{
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struct Qdisc *q = qdisc_create_dflt(dev, &bfifo_qdisc_ops);
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struct rtattr *rta;
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int ret;
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if (q) {
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rta = kmalloc(RTA_LENGTH(sizeof(struct tc_fifo_qopt)),
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GFP_KERNEL);
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if (rta) {
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rta->rta_type = RTM_NEWQDISC;
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rta->rta_len = RTA_LENGTH(sizeof(struct tc_fifo_qopt));
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((struct tc_fifo_qopt *)RTA_DATA(rta))->limit = limit;
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ret = q->ops->change(q, rta);
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kfree(rta);
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if (ret == 0)
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return q;
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}
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qdisc_destroy(q);
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}
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return NULL;
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}
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static int red_change(struct Qdisc *sch, struct rtattr *opt)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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struct rtattr *tb[TCA_RED_MAX];
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struct tc_red_qopt *ctl;
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struct Qdisc *child = NULL;
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if (opt == NULL || rtattr_parse_nested(tb, TCA_RED_MAX, opt))
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return -EINVAL;
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@ -169,9 +219,17 @@ static int red_change(struct Qdisc *sch, struct rtattr *opt)
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ctl = RTA_DATA(tb[TCA_RED_PARMS-1]);
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if (ctl->limit > 0) {
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child = red_create_dflt(sch->dev, ctl->limit);
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if (child == NULL)
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return -ENOMEM;
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}
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sch_tree_lock(sch);
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q->flags = ctl->flags;
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q->limit = ctl->limit;
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if (child)
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qdisc_destroy(xchg(&q->qdisc, child));
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red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog,
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ctl->Plog, ctl->Scell_log,
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@ -186,6 +244,9 @@ static int red_change(struct Qdisc *sch, struct rtattr *opt)
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static int red_init(struct Qdisc* sch, struct rtattr *opt)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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q->qdisc = &noop_qdisc;
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return red_change(sch, opt);
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}
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@ -224,15 +285,101 @@ static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
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return gnet_stats_copy_app(d, &st, sizeof(st));
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}
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static int red_dump_class(struct Qdisc *sch, unsigned long cl,
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struct sk_buff *skb, struct tcmsg *tcm)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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if (cl != 1)
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return -ENOENT;
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tcm->tcm_handle |= TC_H_MIN(1);
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tcm->tcm_info = q->qdisc->handle;
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return 0;
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}
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static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
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struct Qdisc **old)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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if (new == NULL)
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new = &noop_qdisc;
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sch_tree_lock(sch);
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*old = xchg(&q->qdisc, new);
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qdisc_reset(*old);
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sch->q.qlen = 0;
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sch_tree_unlock(sch);
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return 0;
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}
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static struct Qdisc *red_leaf(struct Qdisc *sch, unsigned long arg)
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{
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struct red_sched_data *q = qdisc_priv(sch);
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return q->qdisc;
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}
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static unsigned long red_get(struct Qdisc *sch, u32 classid)
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{
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return 1;
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}
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static void red_put(struct Qdisc *sch, unsigned long arg)
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{
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return;
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}
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static int red_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
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struct rtattr **tca, unsigned long *arg)
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{
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return -ENOSYS;
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}
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static int red_delete(struct Qdisc *sch, unsigned long cl)
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{
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return -ENOSYS;
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}
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static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
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{
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if (!walker->stop) {
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if (walker->count >= walker->skip)
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if (walker->fn(sch, 1, walker) < 0) {
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walker->stop = 1;
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return;
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}
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walker->count++;
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}
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}
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static struct tcf_proto **red_find_tcf(struct Qdisc *sch, unsigned long cl)
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{
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return NULL;
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}
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static struct Qdisc_class_ops red_class_ops = {
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.graft = red_graft,
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.leaf = red_leaf,
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.get = red_get,
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.put = red_put,
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.change = red_change_class,
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.delete = red_delete,
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.walk = red_walk,
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.tcf_chain = red_find_tcf,
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.dump = red_dump_class,
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};
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static struct Qdisc_ops red_qdisc_ops = {
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.id = "red",
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.priv_size = sizeof(struct red_sched_data),
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.cl_ops = &red_class_ops,
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.enqueue = red_enqueue,
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.dequeue = red_dequeue,
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.requeue = red_requeue,
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.drop = red_drop,
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.init = red_init,
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.reset = red_reset,
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.destroy = red_destroy,
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.change = red_change,
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.dump = red_dump,
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.dump_stats = red_dump_stats,
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