sch_cbq.c 47.6 KB
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/*
 * net/sched/sch_cbq.c	Class-Based Queueing discipline.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>


/*	Class-Based Queueing (CBQ) algorithm.
	=======================================

	Sources: [1] Sally Floyd and Van Jacobson, "Link-sharing and Resource
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		 Management Models for Packet Networks",
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		 IEEE/ACM Transactions on Networking, Vol.3, No.4, 1995

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		 [2] Sally Floyd, "Notes on CBQ and Guaranteed Service", 1995
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		 [3] Sally Floyd, "Notes on Class-Based Queueing: Setting
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		 Parameters", 1996

		 [4] Sally Floyd and Michael Speer, "Experimental Results
		 for Class-Based Queueing", 1998, not published.

	-----------------------------------------------------------------------

	Algorithm skeleton was taken from NS simulator cbq.cc.
	If someone wants to check this code against the LBL version,
	he should take into account that ONLY the skeleton was borrowed,
	the implementation is different. Particularly:

	--- The WRR algorithm is different. Our version looks more
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	reasonable (I hope) and works when quanta are allowed to be
	less than MTU, which is always the case when real time classes
	have small rates. Note, that the statement of [3] is
	incomplete, delay may actually be estimated even if class
	per-round allotment is less than MTU. Namely, if per-round
	allotment is W*r_i, and r_1+...+r_k = r < 1
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	delay_i <= ([MTU/(W*r_i)]*W*r + W*r + k*MTU)/B

	In the worst case we have IntServ estimate with D = W*r+k*MTU
	and C = MTU*r. The proof (if correct at all) is trivial.


	--- It seems that cbq-2.0 is not very accurate. At least, I cannot
	interpret some places, which look like wrong translations
	from NS. Anyone is advised to find these differences
	and explain to me, why I am wrong 8).

	--- Linux has no EOI event, so that we cannot estimate true class
	idle time. Workaround is to consider the next dequeue event
	as sign that previous packet is finished. This is wrong because of
	internal device queueing, but on a permanently loaded link it is true.
	Moreover, combined with clock integrator, this scheme looks
	very close to an ideal solution.  */

struct cbq_sched_data;


struct cbq_class
{
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	struct Qdisc_class_common common;
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	struct cbq_class	*next_alive;	/* next class with backlog in this priority band */

/* Parameters */
	unsigned char		priority;	/* class priority */
	unsigned char		priority2;	/* priority to be used after overlimit */
	unsigned char		ewma_log;	/* time constant for idle time calculation */
	unsigned char		ovl_strategy;
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#ifdef CONFIG_NET_CLS_ACT
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	unsigned char		police;
#endif

	u32			defmap;

	/* Link-sharing scheduler parameters */
	long			maxidle;	/* Class parameters: see below. */
	long			offtime;
	long			minidle;
	u32			avpkt;
	struct qdisc_rate_table	*R_tab;

	/* Overlimit strategy parameters */
	void			(*overlimit)(struct cbq_class *cl);
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	psched_tdiff_t		penalty;
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	/* General scheduler (WRR) parameters */
	long			allot;
	long			quantum;	/* Allotment per WRR round */
	long			weight;		/* Relative allotment: see below */

	struct Qdisc		*qdisc;		/* Ptr to CBQ discipline */
	struct cbq_class	*split;		/* Ptr to split node */
	struct cbq_class	*share;		/* Ptr to LS parent in the class tree */
	struct cbq_class	*tparent;	/* Ptr to tree parent in the class tree */
	struct cbq_class	*borrow;	/* NULL if class is bandwidth limited;
						   parent otherwise */
	struct cbq_class	*sibling;	/* Sibling chain */
	struct cbq_class	*children;	/* Pointer to children chain */

	struct Qdisc		*q;		/* Elementary queueing discipline */


/* Variables */
	unsigned char		cpriority;	/* Effective priority */
	unsigned char		delayed;
	unsigned char		level;		/* level of the class in hierarchy:
						   0 for leaf classes, and maximal
						   level of children + 1 for nodes.
						 */

	psched_time_t		last;		/* Last end of service */
	psched_time_t		undertime;
	long			avgidle;
	long			deficit;	/* Saved deficit for WRR */
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	psched_time_t		penalized;
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	struct gnet_stats_basic bstats;
	struct gnet_stats_queue qstats;
	struct gnet_stats_rate_est rate_est;
	struct tc_cbq_xstats	xstats;

	struct tcf_proto	*filter_list;

	int			refcnt;
	int			filters;

	struct cbq_class 	*defaults[TC_PRIO_MAX+1];
};

struct cbq_sched_data
{
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	struct Qdisc_class_hash	clhash;			/* Hash table of all classes */
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	int			nclasses[TC_CBQ_MAXPRIO+1];
	unsigned		quanta[TC_CBQ_MAXPRIO+1];

	struct cbq_class	link;

	unsigned		activemask;
	struct cbq_class	*active[TC_CBQ_MAXPRIO+1];	/* List of all classes
								   with backlog */

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#ifdef CONFIG_NET_CLS_ACT
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	struct cbq_class	*rx_class;
#endif
	struct cbq_class	*tx_class;
	struct cbq_class	*tx_borrowed;
	int			tx_len;
	psched_time_t		now;		/* Cached timestamp */
	psched_time_t		now_rt;		/* Cached real time */
	unsigned		pmask;

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	struct hrtimer		delay_timer;
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	struct qdisc_watchdog	watchdog;	/* Watchdog timer,
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						   started when CBQ has
						   backlog, but cannot
						   transmit just now */
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	psched_tdiff_t		wd_expires;
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	int			toplevel;
	u32			hgenerator;
};


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#define L2T(cl,len)	qdisc_l2t((cl)->R_tab,len)
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static __inline__ struct cbq_class *
cbq_class_lookup(struct cbq_sched_data *q, u32 classid)
{
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	struct Qdisc_class_common *clc;
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	clc = qdisc_class_find(&q->clhash, classid);
	if (clc == NULL)
		return NULL;
	return container_of(clc, struct cbq_class, common);
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}

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#ifdef CONFIG_NET_CLS_ACT
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static struct cbq_class *
cbq_reclassify(struct sk_buff *skb, struct cbq_class *this)
{
	struct cbq_class *cl, *new;

	for (cl = this->tparent; cl; cl = cl->tparent)
		if ((new = cl->defaults[TC_PRIO_BESTEFFORT]) != NULL && new != this)
			return new;

	return NULL;
}

#endif

/* Classify packet. The procedure is pretty complicated, but
   it allows us to combine link sharing and priority scheduling
   transparently.

   Namely, you can put link sharing rules (f.e. route based) at root of CBQ,
   so that it resolves to split nodes. Then packets are classified
   by logical priority, or a more specific classifier may be attached
   to the split node.
 */

static struct cbq_class *
cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *head = &q->link;
	struct cbq_class **defmap;
	struct cbq_class *cl = NULL;
	u32 prio = skb->priority;
	struct tcf_result res;

	/*
	 *  Step 1. If skb->priority points to one of our classes, use it.
	 */
	if (TC_H_MAJ(prio^sch->handle) == 0 &&
	    (cl = cbq_class_lookup(q, prio)) != NULL)
		return cl;

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	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
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	for (;;) {
		int result = 0;
		defmap = head->defaults;

		/*
		 * Step 2+n. Apply classifier.
		 */
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		if (!head->filter_list ||
		    (result = tc_classify_compat(skb, head->filter_list, &res)) < 0)
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			goto fallback;

		if ((cl = (void*)res.class) == NULL) {
			if (TC_H_MAJ(res.classid))
				cl = cbq_class_lookup(q, res.classid);
			else if ((cl = defmap[res.classid&TC_PRIO_MAX]) == NULL)
				cl = defmap[TC_PRIO_BESTEFFORT];

			if (cl == NULL || cl->level >= head->level)
				goto fallback;
		}

#ifdef CONFIG_NET_CLS_ACT
		switch (result) {
		case TC_ACT_QUEUED:
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		case TC_ACT_STOLEN:
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			*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
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		case TC_ACT_SHOT:
			return NULL;
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		case TC_ACT_RECLASSIFY:
			return cbq_reclassify(skb, cl);
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		}
#endif
		if (cl->level == 0)
			return cl;

		/*
		 * Step 3+n. If classifier selected a link sharing class,
		 *	   apply agency specific classifier.
		 *	   Repeat this procdure until we hit a leaf node.
		 */
		head = cl;
	}

fallback:
	cl = head;

	/*
	 * Step 4. No success...
	 */
	if (TC_H_MAJ(prio) == 0 &&
	    !(cl = head->defaults[prio&TC_PRIO_MAX]) &&
	    !(cl = head->defaults[TC_PRIO_BESTEFFORT]))
		return head;

	return cl;
}

/*
   A packet has just been enqueued on the empty class.
   cbq_activate_class adds it to the tail of active class list
   of its priority band.
 */

static __inline__ void cbq_activate_class(struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
	int prio = cl->cpriority;
	struct cbq_class *cl_tail;

	cl_tail = q->active[prio];
	q->active[prio] = cl;

	if (cl_tail != NULL) {
		cl->next_alive = cl_tail->next_alive;
		cl_tail->next_alive = cl;
	} else {
		cl->next_alive = cl;
		q->activemask |= (1<<prio);
	}
}

/*
   Unlink class from active chain.
   Note that this same procedure is done directly in cbq_dequeue*
   during round-robin procedure.
 */

static void cbq_deactivate_class(struct cbq_class *this)
{
	struct cbq_sched_data *q = qdisc_priv(this->qdisc);
	int prio = this->cpriority;
	struct cbq_class *cl;
	struct cbq_class *cl_prev = q->active[prio];

	do {
		cl = cl_prev->next_alive;
		if (cl == this) {
			cl_prev->next_alive = cl->next_alive;
			cl->next_alive = NULL;

			if (cl == q->active[prio]) {
				q->active[prio] = cl_prev;
				if (cl == q->active[prio]) {
					q->active[prio] = NULL;
					q->activemask &= ~(1<<prio);
					return;
				}
			}
			return;
		}
	} while ((cl_prev = cl) != q->active[prio]);
}

static void
cbq_mark_toplevel(struct cbq_sched_data *q, struct cbq_class *cl)
{
	int toplevel = q->toplevel;

	if (toplevel > cl->level && !(cl->q->flags&TCQ_F_THROTTLED)) {
		psched_time_t now;
		psched_tdiff_t incr;

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		now = psched_get_time();
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		incr = now - q->now_rt;
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		now = q->now + incr;
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		do {
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			if (cl->undertime < now) {
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				q->toplevel = cl->level;
				return;
			}
		} while ((cl=cl->borrow) != NULL && toplevel > cl->level);
	}
}

static int
cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
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	int uninitialized_var(ret);
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	struct cbq_class *cl = cbq_classify(skb, sch, &ret);

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	q->rx_class = cl;
#endif
	if (cl == NULL) {
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		if (ret & __NET_XMIT_BYPASS)
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			sch->qstats.drops++;
		kfree_skb(skb);
		return ret;
	}

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	cl->q->__parent = sch;
#endif
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	ret = qdisc_enqueue(skb, cl->q);
	if (ret == NET_XMIT_SUCCESS) {
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		sch->q.qlen++;
		sch->bstats.packets++;
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		sch->bstats.bytes += qdisc_pkt_len(skb);
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		cbq_mark_toplevel(q, cl);
		if (!cl->next_alive)
			cbq_activate_class(cl);
		return ret;
	}

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	if (net_xmit_drop_count(ret)) {
		sch->qstats.drops++;
		cbq_mark_toplevel(q, cl);
		cl->qstats.drops++;
	}
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	return ret;
}

/* Overlimit actions */

/* TC_CBQ_OVL_CLASSIC: (default) penalize leaf class by adding offtime */

static void cbq_ovl_classic(struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
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	psched_tdiff_t delay = cl->undertime - q->now;
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	if (!cl->delayed) {
		delay += cl->offtime;

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		/*
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		   Class goes to sleep, so that it will have no
		   chance to work avgidle. Let's forgive it 8)

		   BTW cbq-2.0 has a crap in this
		   place, apparently they forgot to shift it by cl->ewma_log.
		 */
		if (cl->avgidle < 0)
			delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log);
		if (cl->avgidle < cl->minidle)
			cl->avgidle = cl->minidle;
		if (delay <= 0)
			delay = 1;
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		cl->undertime = q->now + delay;
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		cl->xstats.overactions++;
		cl->delayed = 1;
	}
	if (q->wd_expires == 0 || q->wd_expires > delay)
		q->wd_expires = delay;

	/* Dirty work! We must schedule wakeups based on
	   real available rate, rather than leaf rate,
	   which may be tiny (even zero).
	 */
	if (q->toplevel == TC_CBQ_MAXLEVEL) {
		struct cbq_class *b;
		psched_tdiff_t base_delay = q->wd_expires;

		for (b = cl->borrow; b; b = b->borrow) {
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			delay = b->undertime - q->now;
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			if (delay < base_delay) {
				if (delay <= 0)
					delay = 1;
				base_delay = delay;
			}
		}

		q->wd_expires = base_delay;
	}
}

/* TC_CBQ_OVL_RCLASSIC: penalize by offtime classes in hierarchy, when
   they go overlimit
 */

static void cbq_ovl_rclassic(struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
	struct cbq_class *this = cl;

	do {
		if (cl->level > q->toplevel) {
			cl = NULL;
			break;
		}
	} while ((cl = cl->borrow) != NULL);

	if (cl == NULL)
		cl = this;
	cbq_ovl_classic(cl);
}

/* TC_CBQ_OVL_DELAY: delay until it will go to underlimit */

static void cbq_ovl_delay(struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
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	psched_tdiff_t delay = cl->undertime - q->now;
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	if (test_bit(__QDISC_STATE_DEACTIVATED,
		     &qdisc_root_sleeping(cl->qdisc)->state))
		return;

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	if (!cl->delayed) {
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		psched_time_t sched = q->now;
		ktime_t expires;
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		delay += cl->offtime;
		if (cl->avgidle < 0)
			delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log);
		if (cl->avgidle < cl->minidle)
			cl->avgidle = cl->minidle;
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		cl->undertime = q->now + delay;
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		if (delay > 0) {
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			sched += delay + cl->penalty;
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			cl->penalized = sched;
			cl->cpriority = TC_CBQ_MAXPRIO;
			q->pmask |= (1<<TC_CBQ_MAXPRIO);
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			expires = ktime_set(0, 0);
			expires = ktime_add_ns(expires, PSCHED_US2NS(sched));
			if (hrtimer_try_to_cancel(&q->delay_timer) &&
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			    ktime_to_ns(ktime_sub(
					hrtimer_get_expires(&q->delay_timer),
					expires)) > 0)
				hrtimer_set_expires(&q->delay_timer, expires);
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			hrtimer_restart(&q->delay_timer);
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			cl->delayed = 1;
			cl->xstats.overactions++;
			return;
		}
		delay = 1;
	}
	if (q->wd_expires == 0 || q->wd_expires > delay)
		q->wd_expires = delay;
}

/* TC_CBQ_OVL_LOWPRIO: penalize class by lowering its priority band */

static void cbq_ovl_lowprio(struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);

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	cl->penalized = q->now + cl->penalty;
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	if (cl->cpriority != cl->priority2) {
		cl->cpriority = cl->priority2;
		q->pmask |= (1<<cl->cpriority);
		cl->xstats.overactions++;
	}
	cbq_ovl_classic(cl);
}

/* TC_CBQ_OVL_DROP: penalize class by dropping */

static void cbq_ovl_drop(struct cbq_class *cl)
{
	if (cl->q->ops->drop)
		if (cl->q->ops->drop(cl->q))
			cl->qdisc->q.qlen--;
	cl->xstats.overactions++;
	cbq_ovl_classic(cl);
}

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static psched_tdiff_t cbq_undelay_prio(struct cbq_sched_data *q, int prio,
				       psched_time_t now)
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{
	struct cbq_class *cl;
	struct cbq_class *cl_prev = q->active[prio];
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	psched_time_t sched = now;
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	if (cl_prev == NULL)
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		return 0;
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	do {
		cl = cl_prev->next_alive;
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		if (now - cl->penalized > 0) {
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			cl_prev->next_alive = cl->next_alive;
			cl->next_alive = NULL;
			cl->cpriority = cl->priority;
			cl->delayed = 0;
			cbq_activate_class(cl);

			if (cl == q->active[prio]) {
				q->active[prio] = cl_prev;
				if (cl == q->active[prio]) {
					q->active[prio] = NULL;
					return 0;
				}
			}

			cl = cl_prev->next_alive;
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		} else if (sched - cl->penalized > 0)
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			sched = cl->penalized;
	} while ((cl_prev = cl) != q->active[prio]);

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	return sched - now;
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}

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static enum hrtimer_restart cbq_undelay(struct hrtimer *timer)
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{
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	struct cbq_sched_data *q = container_of(timer, struct cbq_sched_data,
						delay_timer);
	struct Qdisc *sch = q->watchdog.qdisc;
	psched_time_t now;
	psched_tdiff_t delay = 0;
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	unsigned pmask;

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	now = psched_get_time();
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	pmask = q->pmask;
	q->pmask = 0;

	while (pmask) {
		int prio = ffz(~pmask);
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		psched_tdiff_t tmp;
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		pmask &= ~(1<<prio);

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		tmp = cbq_undelay_prio(q, prio, now);
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		if (tmp > 0) {
			q->pmask |= 1<<prio;
			if (tmp < delay || delay == 0)
				delay = tmp;
		}
	}

	if (delay) {
620 621 622 623 624
		ktime_t time;

		time = ktime_set(0, 0);
		time = ktime_add_ns(time, PSCHED_US2NS(now + delay));
		hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS);
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	}

	sch->flags &= ~TCQ_F_THROTTLED;
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	__netif_schedule(qdisc_root(sch));
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	return HRTIMER_NORESTART;
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}

632
#ifdef CONFIG_NET_CLS_ACT
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static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child)
{
	struct Qdisc *sch = child->__parent;
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl = q->rx_class;

	q->rx_class = NULL;

	if (cl && (cl = cbq_reclassify(skb, cl)) != NULL) {
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		int ret;
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		cbq_mark_toplevel(q, cl);

		q->rx_class = cl;
		cl->q->__parent = sch;

649 650
		ret = qdisc_enqueue(skb, cl->q);
		if (ret == NET_XMIT_SUCCESS) {
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			sch->q.qlen++;
			sch->bstats.packets++;
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			sch->bstats.bytes += qdisc_pkt_len(skb);
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			if (!cl->next_alive)
				cbq_activate_class(cl);
			return 0;
		}
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		if (net_xmit_drop_count(ret))
			sch->qstats.drops++;
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		return 0;
	}

	sch->qstats.drops++;
	return -1;
}
#endif

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/*
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   It is mission critical procedure.

   We "regenerate" toplevel cutoff, if transmitting class
   has backlog and it is not regulated. It is not part of
   original CBQ description, but looks more reasonable.
   Probably, it is wrong. This question needs further investigation.
*/

static __inline__ void
cbq_update_toplevel(struct cbq_sched_data *q, struct cbq_class *cl,
		    struct cbq_class *borrowed)
{
	if (cl && q->toplevel >= borrowed->level) {
		if (cl->q->q.qlen > 1) {
			do {
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				if (borrowed->undertime == PSCHED_PASTPERFECT) {
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					q->toplevel = borrowed->level;
					return;
				}
			} while ((borrowed=borrowed->borrow) != NULL);
		}
690
#if 0
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	/* It is not necessary now. Uncommenting it
	   will save CPU cycles, but decrease fairness.
	 */
		q->toplevel = TC_CBQ_MAXLEVEL;
#endif
	}
}

static void
cbq_update(struct cbq_sched_data *q)
{
	struct cbq_class *this = q->tx_class;
	struct cbq_class *cl = this;
	int len = q->tx_len;

	q->tx_class = NULL;

	for ( ; cl; cl = cl->share) {
		long avgidle = cl->avgidle;
		long idle;

		cl->bstats.packets++;
		cl->bstats.bytes += len;

		/*
		   (now - last) is total time between packet right edges.
		   (last_pktlen/rate) is "virtual" busy time, so that

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			 idle = (now - last) - last_pktlen/rate
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		 */

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		idle = q->now - cl->last;
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		if ((unsigned long)idle > 128*1024*1024) {
			avgidle = cl->maxidle;
		} else {
			idle -= L2T(cl, len);

		/* true_avgidle := (1-W)*true_avgidle + W*idle,
		   where W=2^{-ewma_log}. But cl->avgidle is scaled:
		   cl->avgidle == true_avgidle/W,
		   hence:
		 */
			avgidle += idle - (avgidle>>cl->ewma_log);
		}

		if (avgidle <= 0) {
			/* Overlimit or at-limit */

			if (avgidle < cl->minidle)
				avgidle = cl->minidle;

			cl->avgidle = avgidle;

			/* Calculate expected time, when this class
			   will be allowed to send.
			   It will occur, when:
			   (1-W)*true_avgidle + W*delay = 0, i.e.
			   idle = (1/W - 1)*(-true_avgidle)
			   or
			   idle = (1 - W)*(-cl->avgidle);
			 */
			idle = (-avgidle) - ((-avgidle) >> cl->ewma_log);

			/*
			   That is not all.
			   To maintain the rate allocated to the class,
			   we add to undertime virtual clock,
			   necessary to complete transmitted packet.
			   (len/phys_bandwidth has been already passed
			   to the moment of cbq_update)
			 */

			idle -= L2T(&q->link, len);
			idle += L2T(cl, len);

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			cl->undertime = q->now + idle;
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		} else {
			/* Underlimit */

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			cl->undertime = PSCHED_PASTPERFECT;
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			if (avgidle > cl->maxidle)
				cl->avgidle = cl->maxidle;
			else
				cl->avgidle = avgidle;
		}
		cl->last = q->now;
	}

	cbq_update_toplevel(q, this, q->tx_borrowed);
}

static __inline__ struct cbq_class *
cbq_under_limit(struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
	struct cbq_class *this_cl = cl;

	if (cl->tparent == NULL)
		return cl;

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	if (cl->undertime == PSCHED_PASTPERFECT || q->now >= cl->undertime) {
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		cl->delayed = 0;
		return cl;
	}

	do {
		/* It is very suspicious place. Now overlimit
		   action is generated for not bounded classes
		   only if link is completely congested.
		   Though it is in agree with ancestor-only paradigm,
		   it looks very stupid. Particularly,
		   it means that this chunk of code will either
		   never be called or result in strong amplification
		   of burstiness. Dangerous, silly, and, however,
		   no another solution exists.
		 */
		if ((cl = cl->borrow) == NULL) {
			this_cl->qstats.overlimits++;
			this_cl->overlimit(this_cl);
			return NULL;
		}
		if (cl->level > q->toplevel)
			return NULL;
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	} while (cl->undertime != PSCHED_PASTPERFECT && q->now < cl->undertime);
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	cl->delayed = 0;
	return cl;
}

static __inline__ struct sk_buff *
cbq_dequeue_prio(struct Qdisc *sch, int prio)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl_tail, *cl_prev, *cl;
	struct sk_buff *skb;
	int deficit;

	cl_tail = cl_prev = q->active[prio];
	cl = cl_prev->next_alive;

	do {
		deficit = 0;

		/* Start round */
		do {
			struct cbq_class *borrow = cl;

			if (cl->q->q.qlen &&
			    (borrow = cbq_under_limit(cl)) == NULL)
				goto skip_class;

			if (cl->deficit <= 0) {
				/* Class exhausted its allotment per
				   this round. Switch to the next one.
				 */
				deficit = 1;
				cl->deficit += cl->quantum;
				goto next_class;
			}

			skb = cl->q->dequeue(cl->q);

			/* Class did not give us any skb :-(
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			   It could occur even if cl->q->q.qlen != 0
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			   f.e. if cl->q == "tbf"
			 */
			if (skb == NULL)
				goto skip_class;

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			cl->deficit -= qdisc_pkt_len(skb);
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			q->tx_class = cl;
			q->tx_borrowed = borrow;
			if (borrow != cl) {
#ifndef CBQ_XSTATS_BORROWS_BYTES
				borrow->xstats.borrows++;
				cl->xstats.borrows++;
#else
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				borrow->xstats.borrows += qdisc_pkt_len(skb);
				cl->xstats.borrows += qdisc_pkt_len(skb);
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#endif
			}
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			q->tx_len = qdisc_pkt_len(skb);
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			if (cl->deficit <= 0) {
				q->active[prio] = cl;
				cl = cl->next_alive;
				cl->deficit += cl->quantum;
			}
			return skb;

skip_class:
			if (cl->q->q.qlen == 0 || prio != cl->cpriority) {
				/* Class is empty or penalized.
				   Unlink it from active chain.
				 */
				cl_prev->next_alive = cl->next_alive;
				cl->next_alive = NULL;

				/* Did cl_tail point to it? */
				if (cl == cl_tail) {
					/* Repair it! */
					cl_tail = cl_prev;

					/* Was it the last class in this band? */
					if (cl == cl_tail) {
						/* Kill the band! */
						q->active[prio] = NULL;
						q->activemask &= ~(1<<prio);
						if (cl->q->q.qlen)
							cbq_activate_class(cl);
						return NULL;
					}

					q->active[prio] = cl_tail;
				}
				if (cl->q->q.qlen)
					cbq_activate_class(cl);

				cl = cl_prev;
			}

next_class:
			cl_prev = cl;
			cl = cl->next_alive;
		} while (cl_prev != cl_tail);
	} while (deficit);

	q->active[prio] = cl_prev;

	return NULL;
}

static __inline__ struct sk_buff *
cbq_dequeue_1(struct Qdisc *sch)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct sk_buff *skb;
	unsigned activemask;

	activemask = q->activemask&0xFF;
	while (activemask) {
		int prio = ffz(~activemask);
		activemask &= ~(1<<prio);
		skb = cbq_dequeue_prio(sch, prio);
		if (skb)
			return skb;
	}
	return NULL;
}

static struct sk_buff *
cbq_dequeue(struct Qdisc *sch)
{
	struct sk_buff *skb;
	struct cbq_sched_data *q = qdisc_priv(sch);
	psched_time_t now;
	psched_tdiff_t incr;

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	now = psched_get_time();
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	incr = now - q->now_rt;
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	if (q->tx_class) {
		psched_tdiff_t incr2;
		/* Time integrator. We calculate EOS time
		   by adding expected packet transmission time.
		   If real time is greater, we warp artificial clock,
		   so that:

		   cbq_time = max(real_time, work);
		 */
		incr2 = L2T(&q->link, q->tx_len);
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		q->now += incr2;
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		cbq_update(q);
		if ((incr -= incr2) < 0)
			incr = 0;
	}
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	q->now += incr;
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	q->now_rt = now;

	for (;;) {
		q->wd_expires = 0;

		skb = cbq_dequeue_1(sch);
		if (skb) {
			sch->q.qlen--;
			sch->flags &= ~TCQ_F_THROTTLED;
			return skb;
		}

		/* All the classes are overlimit.

		   It is possible, if:

		   1. Scheduler is empty.
		   2. Toplevel cutoff inhibited borrowing.
		   3. Root class is overlimit.

		   Reset 2d and 3d conditions and retry.

		   Note, that NS and cbq-2.0 are buggy, peeking
		   an arbitrary class is appropriate for ancestor-only
		   sharing, but not for toplevel algorithm.

		   Our version is better, but slower, because it requires
		   two passes, but it is unavoidable with top-level sharing.
		*/

		if (q->toplevel == TC_CBQ_MAXLEVEL &&
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		    q->link.undertime == PSCHED_PASTPERFECT)
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			break;

		q->toplevel = TC_CBQ_MAXLEVEL;
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		q->link.undertime = PSCHED_PASTPERFECT;
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	}

	/* No packets in scheduler or nobody wants to give them to us :-(
	   Sigh... start watchdog timer in the last case. */

	if (sch->q.qlen) {
		sch->qstats.overlimits++;
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		if (q->wd_expires)
			qdisc_watchdog_schedule(&q->watchdog,
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						now + q->wd_expires);
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	}
	return NULL;
}

/* CBQ class maintanance routines */

static void cbq_adjust_levels(struct cbq_class *this)
{
	if (this == NULL)
		return;

	do {
		int level = 0;
		struct cbq_class *cl;

		if ((cl = this->children) != NULL) {
			do {
				if (cl->level > level)
					level = cl->level;
			} while ((cl = cl->sibling) != this->children);
		}
		this->level = level+1;
	} while ((this = this->tparent) != NULL);
}

static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio)
{
	struct cbq_class *cl;
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	struct hlist_node *n;
	unsigned int h;
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	if (q->quanta[prio] == 0)
		return;

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	for (h = 0; h < q->clhash.hashsize; h++) {
		hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) {
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			/* BUGGGG... Beware! This expression suffer of
			   arithmetic overflows!
			 */
			if (cl->priority == prio) {
				cl->quantum = (cl->weight*cl->allot*q->nclasses[prio])/
					q->quanta[prio];
			}
1057
			if (cl->quantum <= 0 || cl->quantum>32*qdisc_dev(cl->qdisc)->mtu) {
1058
				printk(KERN_WARNING "CBQ: class %08x has bad quantum==%ld, repaired.\n", cl->common.classid, cl->quantum);
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				cl->quantum = qdisc_dev(cl->qdisc)->mtu/2 + 1;
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			}
		}
	}
}

static void cbq_sync_defmap(struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
	struct cbq_class *split = cl->split;
	unsigned h;
	int i;

	if (split == NULL)
		return;

	for (i=0; i<=TC_PRIO_MAX; i++) {
		if (split->defaults[i] == cl && !(cl->defmap&(1<<i)))
			split->defaults[i] = NULL;
	}

	for (i=0; i<=TC_PRIO_MAX; i++) {
		int level = split->level;

		if (split->defaults[i])
			continue;

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		for (h = 0; h < q->clhash.hashsize; h++) {
			struct hlist_node *n;
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			struct cbq_class *c;

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			hlist_for_each_entry(c, n, &q->clhash.hash[h],
					     common.hnode) {
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				if (c->split == split && c->level < level &&
				    c->defmap&(1<<i)) {
					split->defaults[i] = c;
					level = c->level;
				}
			}
		}
	}
}

static void cbq_change_defmap(struct cbq_class *cl, u32 splitid, u32 def, u32 mask)
{
	struct cbq_class *split = NULL;

	if (splitid == 0) {
		if ((split = cl->split) == NULL)
			return;
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		splitid = split->common.classid;
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	}

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	if (split == NULL || split->common.classid != splitid) {
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		for (split = cl->tparent; split; split = split->tparent)
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			if (split->common.classid == splitid)
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				break;
	}

	if (split == NULL)
		return;

	if (cl->split != split) {
		cl->defmap = 0;
		cbq_sync_defmap(cl);
		cl->split = split;
		cl->defmap = def&mask;
	} else
		cl->defmap = (cl->defmap&~mask)|(def&mask);

	cbq_sync_defmap(cl);
}

static void cbq_unlink_class(struct cbq_class *this)
{
	struct cbq_class *cl, **clp;
	struct cbq_sched_data *q = qdisc_priv(this->qdisc);

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	qdisc_class_hash_remove(&q->clhash, &this->common);
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	if (this->tparent) {
		clp=&this->sibling;
		cl = *clp;
		do {
			if (cl == this) {
				*clp = cl->sibling;
				break;
			}
			clp = &cl->sibling;
		} while ((cl = *clp) != this->sibling);

		if (this->tparent->children == this) {
			this->tparent->children = this->sibling;
			if (this->sibling == this)
				this->tparent->children = NULL;
		}
	} else {
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		WARN_ON(this->sibling != this);
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	}
}

static void cbq_link_class(struct cbq_class *this)
{
	struct cbq_sched_data *q = qdisc_priv(this->qdisc);
	struct cbq_class *parent = this->tparent;

	this->sibling = this;
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	qdisc_class_hash_insert(&q->clhash, &this->common);
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	if (parent == NULL)
		return;

	if (parent->children == NULL) {
		parent->children = this;
	} else {
		this->sibling = parent->children->sibling;
		parent->children->sibling = this;
	}
}

static unsigned int cbq_drop(struct Qdisc* sch)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl, *cl_head;
	int prio;
	unsigned int len;

	for (prio = TC_CBQ_MAXPRIO; prio >= 0; prio--) {
		if ((cl_head = q->active[prio]) == NULL)
			continue;

		cl = cl_head;
		do {
			if (cl->q->ops->drop && (len = cl->q->ops->drop(cl->q))) {
				sch->q.qlen--;
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				if (!cl->q->q.qlen)
					cbq_deactivate_class(cl);
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				return len;
			}
		} while ((cl = cl->next_alive) != cl_head);
	}
	return 0;
}

static void
cbq_reset(struct Qdisc* sch)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl;
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	struct hlist_node *n;
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	int prio;
	unsigned h;

	q->activemask = 0;
	q->pmask = 0;
	q->tx_class = NULL;
	q->tx_borrowed = NULL;
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	qdisc_watchdog_cancel(&q->watchdog);
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	hrtimer_cancel(&q->delay_timer);
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	q->toplevel = TC_CBQ_MAXLEVEL;
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	q->now = psched_get_time();
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	q->now_rt = q->now;

	for (prio = 0; prio <= TC_CBQ_MAXPRIO; prio++)
		q->active[prio] = NULL;

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	for (h = 0; h < q->clhash.hashsize; h++) {
		hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) {
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			qdisc_reset(cl->q);

			cl->next_alive = NULL;
1230
			cl->undertime = PSCHED_PASTPERFECT;
L
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1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
			cl->avgidle = cl->maxidle;
			cl->deficit = cl->quantum;
			cl->cpriority = cl->priority;
		}
	}
	sch->q.qlen = 0;
}


static int cbq_set_lss(struct cbq_class *cl, struct tc_cbq_lssopt *lss)
{
	if (lss->change&TCF_CBQ_LSS_FLAGS) {
		cl->share = (lss->flags&TCF_CBQ_LSS_ISOLATED) ? NULL : cl->tparent;
		cl->borrow = (lss->flags&TCF_CBQ_LSS_BOUNDED) ? NULL : cl->tparent;
	}
	if (lss->change&TCF_CBQ_LSS_EWMA)
		cl->ewma_log = lss->ewma_log;
	if (lss->change&TCF_CBQ_LSS_AVPKT)
		cl->avpkt = lss->avpkt;
	if (lss->change&TCF_CBQ_LSS_MINIDLE)
		cl->minidle = -(long)lss->minidle;
	if (lss->change&TCF_CBQ_LSS_MAXIDLE) {
		cl->maxidle = lss->maxidle;
		cl->avgidle = lss->maxidle;
	}
	if (lss->change&TCF_CBQ_LSS_OFFTIME)
		cl->offtime = lss->offtime;
	return 0;
}

static void cbq_rmprio(struct cbq_sched_data *q, struct cbq_class *cl)
{
	q->nclasses[cl->priority]--;
	q->quanta[cl->priority] -= cl->weight;
	cbq_normalize_quanta(q, cl->priority);
}

static void cbq_addprio(struct cbq_sched_data *q, struct cbq_class *cl)
{
	q->nclasses[cl->priority]++;
	q->quanta[cl->priority] += cl->weight;
	cbq_normalize_quanta(q, cl->priority);
}

static int cbq_set_wrr(struct cbq_class *cl, struct tc_cbq_wrropt *wrr)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);

	if (wrr->allot)
		cl->allot = wrr->allot;
	if (wrr->weight)
		cl->weight = wrr->weight;
	if (wrr->priority) {
		cl->priority = wrr->priority-1;
		cl->cpriority = cl->priority;
		if (cl->priority >= cl->priority2)
			cl->priority2 = TC_CBQ_MAXPRIO-1;
	}

	cbq_addprio(q, cl);
	return 0;
}

static int cbq_set_overlimit(struct cbq_class *cl, struct tc_cbq_ovl *ovl)
{
	switch (ovl->strategy) {
	case TC_CBQ_OVL_CLASSIC:
		cl->overlimit = cbq_ovl_classic;
		break;
	case TC_CBQ_OVL_DELAY:
		cl->overlimit = cbq_ovl_delay;
		break;
	case TC_CBQ_OVL_LOWPRIO:
		if (ovl->priority2-1 >= TC_CBQ_MAXPRIO ||
		    ovl->priority2-1 <= cl->priority)
			return -EINVAL;
		cl->priority2 = ovl->priority2-1;
		cl->overlimit = cbq_ovl_lowprio;
		break;
	case TC_CBQ_OVL_DROP:
		cl->overlimit = cbq_ovl_drop;
		break;
	case TC_CBQ_OVL_RCLASSIC:
		cl->overlimit = cbq_ovl_rclassic;
		break;
	default:
		return -EINVAL;
	}
1319
	cl->penalty = ovl->penalty;
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	return 0;
}

1323
#ifdef CONFIG_NET_CLS_ACT
L
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static int cbq_set_police(struct cbq_class *cl, struct tc_cbq_police *p)
{
	cl->police = p->police;

	if (cl->q->handle) {
		if (p->police == TC_POLICE_RECLASSIFY)
			cl->q->reshape_fail = cbq_reshape_fail;
		else
			cl->q->reshape_fail = NULL;
	}
	return 0;
}
#endif

static int cbq_set_fopt(struct cbq_class *cl, struct tc_cbq_fopt *fopt)
{
	cbq_change_defmap(cl, fopt->split, fopt->defmap, fopt->defchange);
	return 0;
}

1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
static const struct nla_policy cbq_policy[TCA_CBQ_MAX + 1] = {
	[TCA_CBQ_LSSOPT]	= { .len = sizeof(struct tc_cbq_lssopt) },
	[TCA_CBQ_WRROPT]	= { .len = sizeof(struct tc_cbq_wrropt) },
	[TCA_CBQ_FOPT]		= { .len = sizeof(struct tc_cbq_fopt) },
	[TCA_CBQ_OVL_STRATEGY]	= { .len = sizeof(struct tc_cbq_ovl) },
	[TCA_CBQ_RATE]		= { .len = sizeof(struct tc_ratespec) },
	[TCA_CBQ_RTAB]		= { .type = NLA_BINARY, .len = TC_RTAB_SIZE },
	[TCA_CBQ_POLICE]	= { .len = sizeof(struct tc_cbq_police) },
};

1354
static int cbq_init(struct Qdisc *sch, struct nlattr *opt)
L
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{
	struct cbq_sched_data *q = qdisc_priv(sch);
1357
	struct nlattr *tb[TCA_CBQ_MAX + 1];
L
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1358
	struct tc_ratespec *r;
1359 1360
	int err;

1361
	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy);
1362 1363
	if (err < 0)
		return err;
L
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1364

1365
	if (tb[TCA_CBQ_RTAB] == NULL || tb[TCA_CBQ_RATE] == NULL)
L
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1366 1367
		return -EINVAL;

1368
	r = nla_data(tb[TCA_CBQ_RATE]);
L
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1369

1370
	if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB])) == NULL)
L
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1371 1372
		return -EINVAL;

1373 1374 1375 1376
	err = qdisc_class_hash_init(&q->clhash);
	if (err < 0)
		goto put_rtab;

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	q->link.refcnt = 1;
	q->link.sibling = &q->link;
1379
	q->link.common.classid = sch->handle;
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1380
	q->link.qdisc = sch;
1381
	if (!(q->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
1382
					    &pfifo_qdisc_ops,
1383
					    sch->handle)))
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		q->link.q = &noop_qdisc;

	q->link.priority = TC_CBQ_MAXPRIO-1;
	q->link.priority2 = TC_CBQ_MAXPRIO-1;
	q->link.cpriority = TC_CBQ_MAXPRIO-1;
	q->link.ovl_strategy = TC_CBQ_OVL_CLASSIC;
	q->link.overlimit = cbq_ovl_classic;
1391
	q->link.allot = psched_mtu(qdisc_dev(sch));
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1392 1393 1394 1395 1396 1397 1398
	q->link.quantum = q->link.allot;
	q->link.weight = q->link.R_tab->rate.rate;

	q->link.ewma_log = TC_CBQ_DEF_EWMA;
	q->link.avpkt = q->link.allot/2;
	q->link.minidle = -0x7FFFFFFF;

1399
	qdisc_watchdog_init(&q->watchdog, sch);
1400
	hrtimer_init(&q->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
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1401 1402
	q->delay_timer.function = cbq_undelay;
	q->toplevel = TC_CBQ_MAXLEVEL;
1403
	q->now = psched_get_time();
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1404 1405 1406 1407
	q->now_rt = q->now;

	cbq_link_class(&q->link);

1408 1409
	if (tb[TCA_CBQ_LSSOPT])
		cbq_set_lss(&q->link, nla_data(tb[TCA_CBQ_LSSOPT]));
L
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1410 1411 1412

	cbq_addprio(q, &q->link);
	return 0;
1413 1414 1415 1416

put_rtab:
	qdisc_put_rtab(q->link.R_tab);
	return err;
L
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1417 1418 1419 1420
}

static __inline__ int cbq_dump_rate(struct sk_buff *skb, struct cbq_class *cl)
{
1421
	unsigned char *b = skb_tail_pointer(skb);
L
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1422

1423
	NLA_PUT(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate);
L
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1424 1425
	return skb->len;

1426
nla_put_failure:
1427
	nlmsg_trim(skb, b);
L
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1428 1429 1430 1431 1432
	return -1;
}

static __inline__ int cbq_dump_lss(struct sk_buff *skb, struct cbq_class *cl)
{
1433
	unsigned char *b = skb_tail_pointer(skb);
L
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1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
	struct tc_cbq_lssopt opt;

	opt.flags = 0;
	if (cl->borrow == NULL)
		opt.flags |= TCF_CBQ_LSS_BOUNDED;
	if (cl->share == NULL)
		opt.flags |= TCF_CBQ_LSS_ISOLATED;
	opt.ewma_log = cl->ewma_log;
	opt.level = cl->level;
	opt.avpkt = cl->avpkt;
	opt.maxidle = cl->maxidle;
	opt.minidle = (u32)(-cl->minidle);
	opt.offtime = cl->offtime;
	opt.change = ~0;
1448
	NLA_PUT(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt);
L
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1449 1450
	return skb->len;

1451
nla_put_failure:
1452
	nlmsg_trim(skb, b);
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	return -1;
}

static __inline__ int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl)
{
1458
	unsigned char *b = skb_tail_pointer(skb);
L
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	struct tc_cbq_wrropt opt;

	opt.flags = 0;
	opt.allot = cl->allot;
	opt.priority = cl->priority+1;
	opt.cpriority = cl->cpriority+1;
	opt.weight = cl->weight;
1466
	NLA_PUT(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt);
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	return skb->len;

1469
nla_put_failure:
1470
	nlmsg_trim(skb, b);
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	return -1;
}

static __inline__ int cbq_dump_ovl(struct sk_buff *skb, struct cbq_class *cl)
{
1476
	unsigned char *b = skb_tail_pointer(skb);
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	struct tc_cbq_ovl opt;

	opt.strategy = cl->ovl_strategy;
	opt.priority2 = cl->priority2+1;
1481
	opt.pad = 0;
1482
	opt.penalty = cl->penalty;
1483
	NLA_PUT(skb, TCA_CBQ_OVL_STRATEGY, sizeof(opt), &opt);
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	return skb->len;

1486
nla_put_failure:
1487
	nlmsg_trim(skb, b);
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	return -1;
}

static __inline__ int cbq_dump_fopt(struct sk_buff *skb, struct cbq_class *cl)
{
1493
	unsigned char *b = skb_tail_pointer(skb);
L
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	struct tc_cbq_fopt opt;

	if (cl->split || cl->defmap) {
1497
		opt.split = cl->split ? cl->split->common.classid : 0;
L
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		opt.defmap = cl->defmap;
		opt.defchange = ~0;
1500
		NLA_PUT(skb, TCA_CBQ_FOPT, sizeof(opt), &opt);
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1501 1502 1503
	}
	return skb->len;

1504
nla_put_failure:
1505
	nlmsg_trim(skb, b);
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1506 1507 1508
	return -1;
}

1509
#ifdef CONFIG_NET_CLS_ACT
L
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1510 1511
static __inline__ int cbq_dump_police(struct sk_buff *skb, struct cbq_class *cl)
{
1512
	unsigned char *b = skb_tail_pointer(skb);
L
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1513 1514 1515 1516
	struct tc_cbq_police opt;

	if (cl->police) {
		opt.police = cl->police;
1517 1518
		opt.__res1 = 0;
		opt.__res2 = 0;
1519
		NLA_PUT(skb, TCA_CBQ_POLICE, sizeof(opt), &opt);
L
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1520 1521 1522
	}
	return skb->len;

1523
nla_put_failure:
1524
	nlmsg_trim(skb, b);
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1525 1526 1527 1528 1529 1530 1531 1532 1533 1534
	return -1;
}
#endif

static int cbq_dump_attr(struct sk_buff *skb, struct cbq_class *cl)
{
	if (cbq_dump_lss(skb, cl) < 0 ||
	    cbq_dump_rate(skb, cl) < 0 ||
	    cbq_dump_wrr(skb, cl) < 0 ||
	    cbq_dump_ovl(skb, cl) < 0 ||
1535
#ifdef CONFIG_NET_CLS_ACT
L
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	    cbq_dump_police(skb, cl) < 0 ||
#endif
	    cbq_dump_fopt(skb, cl) < 0)
		return -1;
	return 0;
}

static int cbq_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
1546
	struct nlattr *nest;
L
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1547

1548 1549 1550
	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;
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1551
	if (cbq_dump_attr(skb, &q->link) < 0)
1552
		goto nla_put_failure;
1553
	nla_nest_end(skb, nest);
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1554 1555
	return skb->len;

1556
nla_put_failure:
1557
	nla_nest_cancel(skb, nest);
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	return -1;
}

static int
cbq_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
{
	struct cbq_sched_data *q = qdisc_priv(sch);

	q->link.xstats.avgidle = q->link.avgidle;
	return gnet_stats_copy_app(d, &q->link.xstats, sizeof(q->link.xstats));
}

static int
cbq_dump_class(struct Qdisc *sch, unsigned long arg,
	       struct sk_buff *skb, struct tcmsg *tcm)
{
	struct cbq_class *cl = (struct cbq_class*)arg;
1575
	struct nlattr *nest;
L
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	if (cl->tparent)
1578
		tcm->tcm_parent = cl->tparent->common.classid;
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	else
		tcm->tcm_parent = TC_H_ROOT;
1581
	tcm->tcm_handle = cl->common.classid;
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	tcm->tcm_info = cl->q->handle;

1584 1585 1586
	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;
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1587
	if (cbq_dump_attr(skb, cl) < 0)
1588
		goto nla_put_failure;
1589
	nla_nest_end(skb, nest);
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1590 1591
	return skb->len;

1592
nla_put_failure:
1593
	nla_nest_cancel(skb, nest);
L
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1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
	return -1;
}

static int
cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg,
	struct gnet_dump *d)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl = (struct cbq_class*)arg;

	cl->qstats.qlen = cl->q->q.qlen;
	cl->xstats.avgidle = cl->avgidle;
	cl->xstats.undertime = 0;

1608
	if (cl->undertime != PSCHED_PASTPERFECT)
P
Patrick McHardy 已提交
1609
		cl->xstats.undertime = cl->undertime - q->now;
L
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1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625

	if (gnet_stats_copy_basic(d, &cl->bstats) < 0 ||
	    gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
	    gnet_stats_copy_queue(d, &cl->qstats) < 0)
		return -1;

	return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats));
}

static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
		     struct Qdisc **old)
{
	struct cbq_class *cl = (struct cbq_class*)arg;

	if (cl) {
		if (new == NULL) {
1626
			new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
1627
						&pfifo_qdisc_ops,
1628 1629
						cl->common.classid);
			if (new == NULL)
L
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1630 1631
				return -ENOBUFS;
		} else {
1632
#ifdef CONFIG_NET_CLS_ACT
L
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1633 1634 1635 1636 1637
			if (cl->police == TC_POLICE_RECLASSIFY)
				new->reshape_fail = cbq_reshape_fail;
#endif
		}
		sch_tree_lock(sch);
1638 1639
		*old = cl->q;
		cl->q = new;
1640
		qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
L
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1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
		qdisc_reset(*old);
		sch_tree_unlock(sch);

		return 0;
	}
	return -ENOENT;
}

static struct Qdisc *
cbq_leaf(struct Qdisc *sch, unsigned long arg)
{
	struct cbq_class *cl = (struct cbq_class*)arg;

	return cl ? cl->q : NULL;
}

1657 1658 1659 1660 1661 1662 1663 1664
static void cbq_qlen_notify(struct Qdisc *sch, unsigned long arg)
{
	struct cbq_class *cl = (struct cbq_class *)arg;

	if (cl->q->q.qlen == 0)
		cbq_deactivate_class(cl);
}

L
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1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
static unsigned long cbq_get(struct Qdisc *sch, u32 classid)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl = cbq_class_lookup(q, classid);

	if (cl) {
		cl->refcnt++;
		return (unsigned long)cl;
	}
	return 0;
}

static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(sch);

1681
	WARN_ON(cl->filters);
L
Linus Torvalds 已提交
1682

1683
	tcf_destroy_chain(&cl->filter_list);
L
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1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
	qdisc_destroy(cl->q);
	qdisc_put_rtab(cl->R_tab);
	gen_kill_estimator(&cl->bstats, &cl->rate_est);
	if (cl != &q->link)
		kfree(cl);
}

static void
cbq_destroy(struct Qdisc* sch)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
1695
	struct hlist_node *n, *next;
L
Linus Torvalds 已提交
1696 1697 1698
	struct cbq_class *cl;
	unsigned h;

1699
#ifdef CONFIG_NET_CLS_ACT
L
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1700 1701 1702 1703 1704 1705 1706
	q->rx_class = NULL;
#endif
	/*
	 * Filters must be destroyed first because we don't destroy the
	 * classes from root to leafs which means that filters can still
	 * be bound to classes which have been destroyed already. --TGR '04
	 */
1707 1708
	for (h = 0; h < q->clhash.hashsize; h++) {
		hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode)
1709
			tcf_destroy_chain(&cl->filter_list);
1710
	}
1711 1712 1713
	for (h = 0; h < q->clhash.hashsize; h++) {
		hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[h],
					  common.hnode)
L
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1714 1715
			cbq_destroy_class(sch, cl);
	}
1716
	qdisc_class_hash_destroy(&q->clhash);
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1717 1718 1719 1720 1721 1722 1723
}

static void cbq_put(struct Qdisc *sch, unsigned long arg)
{
	struct cbq_class *cl = (struct cbq_class*)arg;

	if (--cl->refcnt == 0) {
1724
#ifdef CONFIG_NET_CLS_ACT
1725
		spinlock_t *root_lock = qdisc_root_sleeping_lock(sch);
L
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1726 1727
		struct cbq_sched_data *q = qdisc_priv(sch);

1728
		spin_lock_bh(root_lock);
L
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1729 1730
		if (q->rx_class == cl)
			q->rx_class = NULL;
1731
		spin_unlock_bh(root_lock);
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#endif

		cbq_destroy_class(sch, cl);
	}
}

static int
1739
cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **tca,
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		 unsigned long *arg)
{
	int err;
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl = (struct cbq_class*)*arg;
1745 1746
	struct nlattr *opt = tca[TCA_OPTIONS];
	struct nlattr *tb[TCA_CBQ_MAX + 1];
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	struct cbq_class *parent;
	struct qdisc_rate_table *rtab = NULL;

1750
	if (opt == NULL)
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		return -EINVAL;

1753
	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy);
1754 1755 1756
	if (err < 0)
		return err;

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	if (cl) {
		/* Check parent */
		if (parentid) {
1760 1761
			if (cl->tparent &&
			    cl->tparent->common.classid != parentid)
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				return -EINVAL;
			if (!cl->tparent && parentid != TC_H_ROOT)
				return -EINVAL;
		}

1767
		if (tb[TCA_CBQ_RATE]) {
1768 1769
			rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]),
					      tb[TCA_CBQ_RTAB]);
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			if (rtab == NULL)
				return -EINVAL;
		}

1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784
		if (tca[TCA_RATE]) {
			err = gen_replace_estimator(&cl->bstats, &cl->rate_est,
						    qdisc_root_sleeping_lock(sch),
						    tca[TCA_RATE]);
			if (err) {
				if (rtab)
					qdisc_put_rtab(rtab);
				return err;
			}
		}

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		/* Change class parameters */
		sch_tree_lock(sch);

		if (cl->next_alive != NULL)
			cbq_deactivate_class(cl);

		if (rtab) {
1792 1793
			qdisc_put_rtab(cl->R_tab);
			cl->R_tab = rtab;
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		}

1796 1797
		if (tb[TCA_CBQ_LSSOPT])
			cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT]));
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1799
		if (tb[TCA_CBQ_WRROPT]) {
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			cbq_rmprio(q, cl);
1801
			cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT]));
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		}

1804 1805
		if (tb[TCA_CBQ_OVL_STRATEGY])
			cbq_set_overlimit(cl, nla_data(tb[TCA_CBQ_OVL_STRATEGY]));
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1807
#ifdef CONFIG_NET_CLS_ACT
1808 1809
		if (tb[TCA_CBQ_POLICE])
			cbq_set_police(cl, nla_data(tb[TCA_CBQ_POLICE]));
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#endif

1812 1813
		if (tb[TCA_CBQ_FOPT])
			cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT]));
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		if (cl->q->q.qlen)
			cbq_activate_class(cl);

		sch_tree_unlock(sch);

		return 0;
	}

	if (parentid == TC_H_ROOT)
		return -EINVAL;

1826 1827
	if (tb[TCA_CBQ_WRROPT] == NULL || tb[TCA_CBQ_RATE] == NULL ||
	    tb[TCA_CBQ_LSSOPT] == NULL)
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		return -EINVAL;

1830
	rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]);
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	if (rtab == NULL)
		return -EINVAL;

	if (classid) {
		err = -EINVAL;
		if (TC_H_MAJ(classid^sch->handle) || cbq_class_lookup(q, classid))
			goto failure;
	} else {
		int i;
		classid = TC_H_MAKE(sch->handle,0x8000);

		for (i=0; i<0x8000; i++) {
			if (++q->hgenerator >= 0x8000)
				q->hgenerator = 1;
			if (cbq_class_lookup(q, classid|q->hgenerator) == NULL)
				break;
		}
		err = -ENOSR;
		if (i >= 0x8000)
			goto failure;
		classid = classid|q->hgenerator;
	}

	parent = &q->link;
	if (parentid) {
		parent = cbq_class_lookup(q, parentid);
		err = -EINVAL;
		if (parent == NULL)
			goto failure;
	}

	err = -ENOBUFS;
1863
	cl = kzalloc(sizeof(*cl), GFP_KERNEL);
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	if (cl == NULL)
		goto failure;
1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876

	if (tca[TCA_RATE]) {
		err = gen_new_estimator(&cl->bstats, &cl->rate_est,
					qdisc_root_sleeping_lock(sch),
					tca[TCA_RATE]);
		if (err) {
			kfree(cl);
			goto failure;
		}
	}

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	cl->R_tab = rtab;
	rtab = NULL;
	cl->refcnt = 1;
1880
	if (!(cl->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
1881
					&pfifo_qdisc_ops, classid)))
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		cl->q = &noop_qdisc;
1883
	cl->common.classid = classid;
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	cl->tparent = parent;
	cl->qdisc = sch;
	cl->allot = parent->allot;
	cl->quantum = cl->allot;
	cl->weight = cl->R_tab->rate.rate;

	sch_tree_lock(sch);
	cbq_link_class(cl);
	cl->borrow = cl->tparent;
	if (cl->tparent != &q->link)
		cl->share = cl->tparent;
	cbq_adjust_levels(parent);
	cl->minidle = -0x7FFFFFFF;
1897 1898
	cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT]));
	cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT]));
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	if (cl->ewma_log==0)
		cl->ewma_log = q->link.ewma_log;
	if (cl->maxidle==0)
		cl->maxidle = q->link.maxidle;
	if (cl->avpkt==0)
		cl->avpkt = q->link.avpkt;
	cl->overlimit = cbq_ovl_classic;
1906 1907
	if (tb[TCA_CBQ_OVL_STRATEGY])
		cbq_set_overlimit(cl, nla_data(tb[TCA_CBQ_OVL_STRATEGY]));
1908
#ifdef CONFIG_NET_CLS_ACT
1909 1910
	if (tb[TCA_CBQ_POLICE])
		cbq_set_police(cl, nla_data(tb[TCA_CBQ_POLICE]));
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#endif
1912 1913
	if (tb[TCA_CBQ_FOPT])
		cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT]));
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	sch_tree_unlock(sch);

1916 1917
	qdisc_class_hash_grow(sch, &q->clhash);

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	*arg = (unsigned long)cl;
	return 0;

failure:
	qdisc_put_rtab(rtab);
	return err;
}

static int cbq_delete(struct Qdisc *sch, unsigned long arg)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl = (struct cbq_class*)arg;
1930
	unsigned int qlen;
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	if (cl->filters || cl->children || cl == &q->link)
		return -EBUSY;

	sch_tree_lock(sch);

1937 1938 1939 1940
	qlen = cl->q->q.qlen;
	qdisc_reset(cl->q);
	qdisc_tree_decrease_qlen(cl->q, qlen);

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	if (cl->next_alive)
		cbq_deactivate_class(cl);

	if (q->tx_borrowed == cl)
		q->tx_borrowed = q->tx_class;
	if (q->tx_class == cl) {
		q->tx_class = NULL;
		q->tx_borrowed = NULL;
	}
1950
#ifdef CONFIG_NET_CLS_ACT
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	if (q->rx_class == cl)
		q->rx_class = NULL;
#endif

	cbq_unlink_class(cl);
	cbq_adjust_levels(cl->tparent);
	cl->defmap = 0;
	cbq_sync_defmap(cl);

	cbq_rmprio(q, cl);
	sch_tree_unlock(sch);

1963 1964 1965 1966 1967
	BUG_ON(--cl->refcnt == 0);
	/*
	 * This shouldn't happen: we "hold" one cops->get() when called
	 * from tc_ctl_tclass; the destroy method is done from cops->put().
	 */
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	return 0;
}

static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *cl = (struct cbq_class *)arg;

	if (cl == NULL)
		cl = &q->link;

	return &cl->filter_list;
}

static unsigned long cbq_bind_filter(struct Qdisc *sch, unsigned long parent,
				     u32 classid)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct cbq_class *p = (struct cbq_class*)parent;
	struct cbq_class *cl = cbq_class_lookup(q, classid);

	if (cl) {
		if (p && p->level <= cl->level)
			return 0;
		cl->filters++;
		return (unsigned long)cl;
	}
	return 0;
}

static void cbq_unbind_filter(struct Qdisc *sch, unsigned long arg)
{
	struct cbq_class *cl = (struct cbq_class*)arg;

	cl->filters--;
}

static void cbq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
2009 2010
	struct cbq_class *cl;
	struct hlist_node *n;
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	unsigned h;

	if (arg->stop)
		return;

2016 2017
	for (h = 0; h < q->clhash.hashsize; h++) {
		hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) {
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			if (arg->count < arg->skip) {
				arg->count++;
				continue;
			}
			if (arg->fn(sch, (unsigned long)cl, arg) < 0) {
				arg->stop = 1;
				return;
			}
			arg->count++;
		}
	}
}

2031
static const struct Qdisc_class_ops cbq_class_ops = {
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	.graft		=	cbq_graft,
	.leaf		=	cbq_leaf,
2034
	.qlen_notify	=	cbq_qlen_notify,
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	.get		=	cbq_get,
	.put		=	cbq_put,
	.change		=	cbq_change_class,
	.delete		=	cbq_delete,
	.walk		=	cbq_walk,
	.tcf_chain	=	cbq_find_tcf,
	.bind_tcf	=	cbq_bind_filter,
	.unbind_tcf	=	cbq_unbind_filter,
	.dump		=	cbq_dump_class,
	.dump_stats	=	cbq_dump_class_stats,
};

2047
static struct Qdisc_ops cbq_qdisc_ops __read_mostly = {
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	.next		=	NULL,
	.cl_ops		=	&cbq_class_ops,
	.id		=	"cbq",
	.priv_size	=	sizeof(struct cbq_sched_data),
	.enqueue	=	cbq_enqueue,
	.dequeue	=	cbq_dequeue,
2054
	.peek		=	qdisc_peek_dequeued,
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	.drop		=	cbq_drop,
	.init		=	cbq_init,
	.reset		=	cbq_reset,
	.destroy	=	cbq_destroy,
	.change		=	NULL,
	.dump		=	cbq_dump,
	.dump_stats	=	cbq_dump_stats,
	.owner		=	THIS_MODULE,
};

static int __init cbq_module_init(void)
{
	return register_qdisc(&cbq_qdisc_ops);
}
2069
static void __exit cbq_module_exit(void)
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{
	unregister_qdisc(&cbq_qdisc_ops);
}
module_init(cbq_module_init)
module_exit(cbq_module_exit)
MODULE_LICENSE("GPL");