Release 4.8 net/sched/sch_cbq.c

Directory: net/sched
/*
 * 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/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>


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

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

                 [2] Sally Floyd, "Notes on CBQ and Guaranteed Service", 1995

                 [3] Sally Floyd, "Notes on Class-Based Queueing: Setting
                 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
        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

        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 {
	
struct Qdisc_class_common common;
	
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 */

	
u32			defmap;

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

	/* 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 */
	
psched_time_t		penalized;
	
struct gnet_stats_basic_packed bstats;
	
struct gnet_stats_queue qstats;
	
struct gnet_stats_rate_est64 rate_est;
	
struct tc_cbq_xstats	xstats;

	
struct tcf_proto __rcu	*filter_list;

	
int			refcnt;
	
int			filters;

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


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

	
struct cbq_class	link;

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

#ifdef CONFIG_NET_CLS_ACT
	
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 */
	
unsigned int		pmask;

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



#define L2T(cl, len)	qdisc_l2t((cl)->R_tab, len)


static inline struct cbq_class *

cbq_class_lookup(struct cbq_sched_data *q, u32 classid)
{
	struct Qdisc_class_common *clc;

	clc = qdisc_class_find(&q->clhash, classid);
	if (clc == NULL)
		return NULL;
	return container_of(clc, struct cbq_class, common);
}

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#ifdef CONFIG_NET_CLS_ACT


static struct cbq_class *

cbq_reclassify(struct sk_buff *skb, struct cbq_class *this)
{
	struct cbq_class *cl;

	for (cl = this->tparent; cl; cl = cl->tparent) {
		struct cbq_class *new = cl->defaults[TC_PRIO_BESTEFFORT];

		if (new != NULL && new != this)
			return new;
	}
	return NULL;
}

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#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_proto *fl;
	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;

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

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

		cl = (void *)res.class;
		if (!cl) {
			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)
				goto fallback;
		}
		if (cl->level >= head->level)
			goto fallback;
#ifdef CONFIG_NET_CLS_ACT
		switch (result) {
		case TC_ACT_QUEUED:
		case TC_ACT_STOLEN:
			*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
		case TC_ACT_SHOT:
			return NULL;
		case TC_ACT_RECLASSIFY:
			return cbq_reclassify(skb, cl);
		}
#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;
}

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/*
 * 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);
	}
}

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/*
 * 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]);
}

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static void

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

	if (toplevel > cl->level) {
		psched_time_t now = psched_get_time();

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

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static int

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

#ifdef CONFIG_NET_CLS_ACT
	q->rx_class = cl;
#endif
	if (cl == NULL) {
		if (ret & __NET_XMIT_BYPASS)
			qdisc_qstats_drop(sch);
		__qdisc_drop(skb, to_free);
		return ret;
	}

	ret = qdisc_enqueue(skb, cl->q, to_free);
	if (ret == NET_XMIT_SUCCESS) {
		sch->q.qlen++;
		cbq_mark_toplevel(q, cl);
		if (!cl->next_alive)
			cbq_activate_class(cl);
		return ret;
	}

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

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/* Overlimit action: penalize leaf class by adding offtime */


static void cbq_overlimit(struct cbq_class *cl)
{
	struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
	psched_tdiff_t delay = cl->undertime - q->now;

	if (!cl->delayed) {
		delay += cl->offtime;

		/*
                 * 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;
		cl->undertime = q->now + delay;

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

		q->wd_expires = base_delay;
	}
}

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static psched_tdiff_t cbq_undelay_prio(struct cbq_sched_data *q, int prio,
				       psched_time_t now)
{
	struct cbq_class *cl;
	struct cbq_class *cl_prev = q->active[prio];
	psched_time_t sched = now;

	if (cl_prev == NULL)
		return 0;

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

	return sched - now;
}

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static enum hrtimer_restart cbq_undelay(struct hrtimer *timer)
{
	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;
	unsigned int pmask;

	now = psched_get_time();

	pmask = q->pmask;
	q->pmask = 0;

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

		pmask &= ~(1<<prio);

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

	if (delay) {
		ktime_t time;

		time = ktime_set(0, 0);
		time = ktime_add_ns(time, PSCHED_TICKS2NS(now + delay));
		hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS_PINNED);
	}

	__netif_schedule(qdisc_root(sch));
	return HRTIMER_NORESTART;
}

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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 {
				if (borrowed->undertime == PSCHED_PASTPERFECT) {
					q->toplevel = borrowed->level;
					return;
				}
			} while ((borrowed = borrowed->borrow) != NULL);
		}
#if 0
	/* It is not necessary now. Uncommenting it
           will save CPU cycles, but decrease fairness.
         */
		q->toplevel = TC_CBQ_MAXLEVEL;
#endif
	}
}

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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;
	psched_time_t now;

	q->tx_class = NULL;
	/* Time integrator. We calculate EOS time
         * by adding expected packet transmission time.
         */
	now = q->now + L2T(&q->link, len);

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

		idle = now - cl->last;
		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);

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

			cl->undertime = PSCHED_PASTPERFECT;
			if (avgidle > cl->maxidle)
				cl->avgidle = cl->maxidle;
			else
				cl->avgidle = avgidle;
		}
		if ((s64)(now - cl->last) > 0)
			cl->last = now;
	}

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

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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;

	if (cl->undertime == PSCHED_PASTPERFECT || q->now >= cl->undertime) {
		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.
                 */
		cl = cl->borrow;
		if (!cl) {
			this_cl->qstats.overlimits++;
			cbq_overlimit(this_cl);
			return NULL;
		}
		if (cl->level > q->toplevel)
			return NULL;
	} while (cl->undertime != PSCHED_PASTPERFECT && q->now < cl->undertime);

	cl->delayed = 0;
	return cl;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 106 74.65% 2 25.00%
eric dumazet eric dumazet 25 17.61% 1 12.50%
patrick mchardy patrick mchardy 6 4.23% 2 25.00%
stephen hemminger stephen hemminger 3 2.11% 1 12.50%
thomas graf thomas graf 1 0.70% 1 12.50%
florian westphal florian westphal 1 0.70% 1 12.50%
Total 142 100.00% 8 100.00%


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 :-(
                         * It could occur even if cl->q->q.qlen != 0
                         * f.e. if cl->q == "tbf"
                         */
			if (skb == NULL)
				goto skip_class;

			cl->deficit -= qdisc_pkt_len(skb);
			q->tx_class = cl;
			q->tx_borrowed = borrow;
			if (borrow != cl) {
#ifndef CBQ_XSTATS_BORROWS_BYTES
				borrow->xstats.borrows++;
				cl->xstats.borrows++;
#else
				borrow->xstats.borrows += qdisc_pkt_len(skb);
				cl->xstats.borrows += qdisc_pkt_len(skb);
#endif
			}
			q->tx_len = qdisc_pkt_len(skb);

			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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 414 95.39% 3 50.00%
jussi kivilinna jussi kivilinna 12 2.76% 1 16.67%
eric dumazet eric dumazet 5 1.15% 1 16.67%
stephen hemminger stephen hemminger 3 0.69% 1 16.67%
Total 434 100.00% 6 100.00%


static inline struct sk_buff *

cbq_dequeue_1(struct Qdisc *sch)
{
	struct cbq_sched_data *q = qdisc_priv(sch);
	struct sk_buff *skb;
	unsigned int 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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 60 71.43% 1 33.33%
eric dumazet eric dumazet 21 25.00% 1 33.33%
stephen hemminger stephen hemminger 3 3.57% 1 33.33%
Total 84 100.00% 3 100.00%


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;

	now = psched_get_time();

	if (q->tx_class)
		cbq_update(q);

	q->now = now;

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

		skb = cbq_dequeue_1(sch);
		if (skb) {
			qdisc_bstats_update(sch, skb);
			sch->q.qlen--;
			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 &&
		    q->link.undertime == PSCHED_PASTPERFECT)
			break;

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

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

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 129 77.25% 2 18.18%
patrick mchardy patrick mchardy 13 7.78% 3 27.27%
eric dumazet eric dumazet 10 5.99% 2 18.18%
vasily averin vasily averin 6 3.59% 1 9.09%
stephen hemminger stephen hemminger 3 1.80% 1 9.09%
john fastabend john fastabend 3 1.80% 1 9.09%
vinay k nallamothu vinay k nallamothu 3 1.80% 1 9.09%
Total 167 100.00% 11 100.00%

/* 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;

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 92 95.83% 1 50.00%
eric dumazet eric dumazet 4 4.17% 1 50.00%
Total 96 100.00% 2 100.00%



static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio)
{
	struct cbq_class *cl;
	unsigned int h;

	if (q->quanta[prio] == 0)
		return;

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 136 85.00% 2 33.33%
patrick mchardy patrick mchardy 16 10.00% 1 16.67%
david s. miller david s. miller 6 3.75% 1 16.67%
yang yingliang yang yingliang 1 0.62% 1 16.67%
eric dumazet eric dumazet 1 0.62% 1 16.67%
Total 160 100.00% 6 100.00%



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 int 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;

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

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 184 91.54% 1 25.00%
patrick mchardy patrick mchardy 13 6.47% 1 25.00%
stephen hemminger stephen hemminger 3 1.49% 1 25.00%
eric dumazet eric dumazet 1 0.50% 1 25.00%
Total 201 100.00% 4 100.00%



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

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

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 154 93.33% 1 33.33%
patrick mchardy patrick mchardy 6 3.64% 1 33.33%
eric dumazet eric dumazet 5 3.03% 1 33.33%
Total 165 100.00% 3 100.00%



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

	qdisc_class_hash_remove(&q->clhash, &this->common);

	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 {
		WARN_ON(this->sibling != this);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 144 92.90% 1 25.00%
patrick mchardy patrick mchardy 6 3.87% 1 25.00%
stephen hemminger stephen hemminger 3 1.94% 1 25.00%
ilpo jarvinen ilpo jarvinen 2 1.29% 1 25.00%
Total 155 100.00% 4 100.00%



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;
	qdisc_class_hash_insert(&q->clhash, &this->common);

	if (parent == NULL)
		return;

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 83 87.37% 2 50.00%
patrick mchardy patrick mchardy 9 9.47% 1 25.00%
stephen hemminger stephen hemminger 3 3.16% 1 25.00%
Total 95 100.00% 4 100.00%


static void

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

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

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

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

			cl->next_alive = NULL;
			cl->undertime = PSCHED_PASTPERFECT;
			cl->avgidle = cl->maxidle;
			cl->deficit = cl->quantum;
			cl->cpriority = cl->priority;
		}
	}
	sch->q.qlen = 0;
}


Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 163 86.70% 3 30.00%
patrick mchardy patrick mchardy 20 10.64% 4 40.00%
stephen hemminger stephen hemminger 3 1.60% 1 10.00%
eric dumazet eric dumazet 1 0.53% 1 10.00%
david s. miller david s. miller 1 0.53% 1 10.00%
Total 188 100.00% 10 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 159 100.00% 2 100.00%
Total 159 100.00% 2 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 63 57.27% 1 33.33%
florian westphal florian westphal 44 40.00% 1 33.33%
stephen hemminger stephen hemminger 3 2.73% 1 33.33%
Total 110 100.00% 3 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%


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) },
};



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

	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy);
	if (err < 0)
		return err;

	if (tb[TCA_CBQ_RTAB] == NULL || tb[TCA_CBQ_RATE] == NULL)
		return -EINVAL;

	r = nla_data(tb[TCA_CBQ_RATE]);

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

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

	q->link.refcnt = 1;
	q->link.sibling = &q->link;
	q->link.common.classid = sch->handle;
	q->link.qdisc = sch;
	q->link.q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
				      sch->handle);
	if (!q->link.q)
		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.allot = psched_mtu(qdisc_dev(sch));
	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;

	qdisc_watchdog_init(&q->watchdog, sch);
	hrtimer_init(&q->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
	q->delay_timer.function = cbq_undelay;
	q->toplevel = TC_CBQ_MAXLEVEL;
	q->now = psched_get_time();

	cbq_link_class(&q->link);

	if (tb[TCA_CBQ_LSSOPT])
		cbq_set_lss(&q->link, nla_data(tb[TCA_CBQ_LSSOPT]));

	cbq_addprio(q, &q->link);
	return 0;

put_rtab:
	qdisc_put_rtab(q->link.R_tab);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 328 77.73% 3 17.65%
patrick mchardy patrick mchardy 73 17.30% 8 47.06%
changli gao changli gao 9 2.13% 1 5.88%
david s. miller david s. miller 8 1.90% 3 17.65%
stephen hemminger stephen hemminger 3 0.71% 1 5.88%
eric dumazet eric dumazet 1 0.24% 1 5.88%
Total 422 100.00% 17 100.00%



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

	if (nla_put(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate))
		goto nla_put_failure;
	return skb->len;

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 60 83.33% 1 20.00%
david s. miller david s. miller 7 9.72% 1 20.00%
arnaldo carvalho de melo arnaldo carvalho de melo 4 5.56% 2 40.00%
patrick mchardy patrick mchardy 1 1.39% 1 20.00%
Total 72 100.00% 5 100.00%



static int cbq_dump_lss(struct sk_buff *skb, struct cbq_class *cl)
{
	unsigned char *b = skb_tail_pointer(skb);
	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;
	if (nla_put(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt))
		goto nla_put_failure;
	return skb->len;

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 151 92.64% 1 20.00%
david s. miller david s. miller 7 4.29% 1 20.00%
arnaldo carvalho de melo arnaldo carvalho de melo 4 2.45% 2 40.00%
patrick mchardy patrick mchardy 1 0.61% 1 20.00%
Total 163 100.00% 5 100.00%



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

	memset(&opt, 0, sizeof(opt));
	opt.flags = 0;
	opt.allot = cl->allot;
	opt.priority = cl->priority + 1;
	opt.cpriority = cl->cpriority + 1;
	opt.weight = cl->weight;
	if (nla_put(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt))
		goto nla_put_failure;
	return skb->len;

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 98 79.67% 1 16.67%
david s. miller david s. miller 20 16.26% 2 33.33%
arnaldo carvalho de melo arnaldo carvalho de melo 4 3.25% 2 33.33%
patrick mchardy patrick mchardy 1 0.81% 1 16.67%
Total 123 100.00% 6 100.00%



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

	if (cl->split || cl->defmap) {
		opt.split = cl->split ? cl->split->common.classid : 0;
		opt.defmap = cl->defmap;
		opt.defchange = ~0;
		if (nla_put(skb, TCA_CBQ_FOPT, sizeof(opt), &opt))
			goto nla_put_failure;
	}
	return skb->len;

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 99 87.61% 1 16.67%
david s. miller david s. miller 7 6.19% 1 16.67%
arnaldo carvalho de melo arnaldo carvalho de melo 4 3.54% 2 33.33%
patrick mchardy patrick mchardy 3 2.65% 2 33.33%
Total 113 100.00% 6 100.00%



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_fopt(skb, cl) < 0)
		return -1;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 61 100.00% 1 100.00%
Total 61 100.00% 1 100.00%



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

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;
	if (cbq_dump_attr(skb, &q->link) < 0)
		goto nla_put_failure;
	return nla_nest_end(skb, nest);

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 51 58.62% 2 25.00%
patrick mchardy patrick mchardy 20 22.99% 2 25.00%
thomas graf thomas graf 10 11.49% 1 12.50%
stephen hemminger stephen hemminger 3 3.45% 1 12.50%
arnaldo carvalho de melo arnaldo carvalho de melo 2 2.30% 1 12.50%
yang yingliang yang yingliang 1 1.15% 1 12.50%
Total 87 100.00% 8 100.00%


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));
}

Contributors
Person Tokens Prop Commits CommitProp
thomas graf thomas graf 34 54.84% 1 33.33%
pre-git pre-git 28 45.16% 2 66.67%
Total 62 100.00% 3 100.00%


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;
	struct nlattr *nest;

	if (cl->tparent)
		tcm->tcm_parent = cl->tparent->common.classid;
	else
		tcm->tcm_parent = TC_H_ROOT;
	tcm->tcm_handle = cl->common.classid;
	tcm->tcm_info = cl->q->handle;

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;
	if (cbq_dump_attr(skb, cl) < 0)
		goto nla_put_failure;
	return nla_nest_end(skb, nest);

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 101 72.14% 2 25.00%
patrick mchardy patrick mchardy 24 17.14% 3 37.50%
thomas graf thomas graf 12 8.57% 1 12.50%
arnaldo carvalho de melo arnaldo carvalho de melo 2 1.43% 1 12.50%
yang yingliang yang yingliang 1 0.71% 1 12.50%
Total 140 100.00% 8 100.00%


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->xstats.avgidle = cl->avgidle;
	cl->xstats.undertime = 0;

	if (cl->undertime != PSCHED_PASTPERFECT)
		cl->xstats.undertime = cl->undertime - q->now;

	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
				  d, NULL, &cl->bstats) < 0 ||
	    gnet_stats_copy_rate_est(d, &cl->bstats, &cl->rate_est) < 0 ||
	    gnet_stats_copy_queue(d, NULL, &cl->qstats, cl->q->q.qlen) < 0)
		return -1;

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

Contributors
Person Tokens Prop Commits CommitProp
thomas graf thomas graf 78 47.56% 1 10.00%
pre-git pre-git 61 37.20% 2 20.00%
john fastabend john fastabend 12 7.32% 3 30.00%
eric dumazet eric dumazet 10 6.10% 2 20.00%
patrick mchardy patrick mchardy 3 1.83% 2 20.00%
Total 164 100.00% 10 100.00%



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 (new == NULL) {
		new = qdisc_create_dflt(sch->dev_queue,
					&pfifo_qdisc_ops, cl->common.classid);
		if (new == NULL)
			return -ENOBUFS;
	}

	*old = qdisc_replace(sch, new, &cl->q);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 68 73.91% 2 25.00%
patrick mchardy patrick mchardy 14 15.22% 4 50.00%
americo wang americo wang 6 6.52% 1 12.50%
david s. miller david s. miller 4 4.35% 1 12.50%
Total 92 100.00% 8 100.00%



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

	return cl->q;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
jarek poplawski jarek poplawski 44 100.00% 1 100.00%
Total 44 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 55 94.83% 1 50.00%
stephen hemminger stephen hemminger 3 5.17% 1 50.00%
Total 58 100.00% 2 100.00%



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

	WARN_ON(cl->filters);

	tcf_destroy_chain(&cl->filter_list);
	qdisc_destroy(cl->q);
	qdisc_put_rtab(cl->R_tab);
	gen_kill_estimator(&cl->bstats, &cl->rate_est);
	if (cl != &q->link)
		kfree(cl);
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 40 48.78% 2 25.00%
patrick mchardy patrick mchardy 28 34.15% 3 37.50%
thomas graf thomas graf 13 15.85% 2 25.00%
ilpo jarvinen ilpo jarvinen 1 1.22% 1 12.50%
Total 82 100.00% 8 100.00%



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

#ifdef CONFIG_NET_CLS_ACT
	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
         */
	for (h = 0; h < q->clhash.hashsize; h++) {
		hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode)
			tcf_destroy_chain(&cl->filter_list);
	}
	for (h = 0; h < q->clhash.hashsize; h++) {
		hlist_for_each_entry_safe(cl, next, &q->clhash.hash[h],
					  common.hnode)
			cbq_destroy_class(sch, cl);
	}
	qdisc_class_hash_destroy(&q->clhash);
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 52 41.27% 7 53.85%
pre-git pre-git 51 40.48% 2 15.38%
thomas graf thomas graf 17 13.49% 1 7.69%
stephen hemminger stephen hemminger 3 2.38% 1 7.69%
linus torvalds linus torvalds 2 1.59% 1 7.69%
eric dumazet eric dumazet 1 0.79% 1 7.69%
Total 126 100.00% 13 100.00%



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

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

		spin_lock_bh(root_lock);
		if (q->rx_class == cl)
			q->rx_class = NULL;
		spin_unlock_bh(root_lock);
#endif

		cbq_destroy_class(sch, cl);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 74 79.57% 4 40.00%
david s. miller david s. miller 10 10.75% 1 10.00%
patrick mchardy patrick mchardy 5 5.38% 3 30.00%
stephen hemminger stephen hemminger 3 3.23% 1 10.00%
jarek poplawski jarek poplawski 1 1.08% 1 10.00%
Total 93 100.00% 10 100.00%


static int

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

	if (opt == NULL)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy);
	if (err < 0)
		return err;

	if (tb[TCA_CBQ_OVL_STRATEGY] || tb[TCA_CBQ_POLICE])
		return -EOPNOTSUPP;

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

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

		if (tca[TCA_RATE]) {
			err = gen_replace_estimator(&cl->bstats, NULL,
						    &cl->rate_est,
						    NULL,
						    qdisc_root_sleeping_running(sch),
						    tca[TCA_RATE]);
			if (err) {
				qdisc_put_rtab(rtab);
				return err;
			}
		}

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

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

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

		if (tb[TCA_CBQ_LSSOPT])
			cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT]));

		if (tb[TCA_CBQ_WRROPT]) {
			cbq_rmprio(q, cl);
			cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT]));
		}

		if (tb[TCA_CBQ_FOPT])
			cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT]));

		if (cl->q->q.qlen)
			cbq_activate_class(cl);

		sch_tree_unlock(sch);

		return 0;
	}

	if (parentid == TC_H_ROOT)
		return -EINVAL;

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

	rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]);
	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;
	cl = kzalloc(sizeof(*cl), GFP_KERNEL);
	if (cl == NULL)
		goto failure;

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

	cl->R_tab = rtab;
	rtab = NULL;
	cl->refcnt = 1;
	cl->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
	if (!cl->q)
		cl->q = &noop_qdisc;
	cl->common.classid = classid;
	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;
	cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT]));
	cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT]));
	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;
	if (tb[TCA_CBQ_FOPT])
		cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT]));
	sch_tree_unlock(sch);

	qdisc_class_hash_grow(sch, &q->clhash);

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

failure:
	qdisc_put_rtab(rtab);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 792 80.98% 5 25.00%
stephen hemminger stephen hemminger 97 9.92% 2 10.00%
patrick mchardy patrick mchardy 51 5.21% 6 30.00%
florian westphal florian westphal 16 1.64% 2 10.00%
changli gao changli gao 7 0.72% 1 5.00%
eric dumazet eric dumazet 6 0.61% 1 5.00%
john fastabend john fastabend 4 0.41% 1 5.00%
david s. miller david s. miller 4 0.41% 1 5.00%
panagiotis issaris* panagiotis issaris* 1 0.10% 1 5.00%
Total 978 100.00% 20 100.00%



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;
	unsigned int qlen, backlog;

	if (cl->filters || cl->children || cl == &q->link)
		return -EBUSY;

	sch_tree_lock(sch);

	qlen = cl->q->q.qlen;
	backlog = cl->q->qstats.backlog;
	qdisc_reset(cl->q);
	qdisc_tree_reduce_backlog(cl->q, qlen, backlog);

	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;
	}
#ifdef CONFIG_NET_CLS_ACT
	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);

	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().
         */

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 171 76.34% 4 40.00%
jarek poplawski jarek poplawski 32 14.29% 2 20.00%
americo wang americo wang 15 6.70% 1 10.00%
patrick mchardy patrick mchardy 3 1.34% 2 20.00%
stephen hemminger stephen hemminger 3 1.34% 1 10.00%
Total 224 100.00% 10 100.00%



static struct tcf_proto __rcu **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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 56 93.33% 2 50.00%
stephen hemminger stephen hemminger 3 5.00% 1 25.00%
john fastabend john fastabend 1 1.67% 1 25.00%
Total 60 100.00% 4 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 86 96.63% 3 75.00%
stephen hemminger stephen hemminger 3 3.37% 1 25.00%
Total 89 100.00% 4 100.00%



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

	cl->filters--;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 32 100.00% 2 100.00%
Total 32 100.00% 2 100.00%



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

	if (arg->stop)
		return;

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 100 81.97% 3 50.00%
patrick mchardy patrick mchardy 18 14.75% 1 16.67%
stephen hemminger stephen hemminger 3 2.46% 1 16.67%
eric dumazet eric dumazet 1 0.82% 1 16.67%
Total 122 100.00% 6 100.00%


static const struct Qdisc_class_ops cbq_class_ops = {
	.graft		=	cbq_graft,
	.leaf		=	cbq_leaf,
	.qlen_notify	=	cbq_qlen_notify,
	.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,
};


static struct Qdisc_ops cbq_qdisc_ops __read_mostly = {
	.next		=	NULL,
	.cl_ops		=	&cbq_class_ops,
	.id		=	"cbq",
	.priv_size	=	sizeof(struct cbq_sched_data),
	.enqueue	=	cbq_enqueue,
	.dequeue	=	cbq_dequeue,
	.peek		=	qdisc_peek_dequeued,
	.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);
}
Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 13 81.25% 2 66.67%
al viro al viro 3 18.75% 1 33.33%
Total 16 100.00% 3 100.00%



static void __exit cbq_module_exit(void)
{
	unregister_qdisc(&cbq_qdisc_ops);
}
Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 12 80.00% 2 66.67%
al viro al viro 3 20.00% 1 33.33%
Total 15 100.00% 3 100.00%

module_init(cbq_module_init)
module_exit(cbq_module_exit)
MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 6500 77.81% 8 8.08%
patrick mchardy patrick mchardy 661 7.91% 25 25.25%
thomas graf thomas graf 186 2.23% 5 5.05%
stephen hemminger stephen hemminger 166 1.99% 2 2.02%
eric dumazet eric dumazet 165 1.98% 10 10.10%
florian westphal florian westphal 165 1.98% 2 2.02%
jarek poplawski jarek poplawski 104 1.24% 7 7.07%
david s. miller david s. miller 86 1.03% 9 9.09%
dave jones dave jones 66 0.79% 1 1.01%
john fastabend john fastabend 47 0.56% 5 5.05%
jamal hadi salim jamal hadi salim 46 0.55% 1 1.01%
vasily averin vasily averin 43 0.51% 3 3.03%
americo wang americo wang 21 0.25% 2 2.02%
arnaldo carvalho de melo arnaldo carvalho de melo 20 0.24% 2 2.02%
jussi kivilinna jussi kivilinna 17 0.20% 2 2.02%
changli gao changli gao 16 0.19% 1 1.01%
al viro al viro 15 0.18% 1 1.01%
linus torvalds linus torvalds 9 0.11% 3 3.03%
vinay k nallamothu vinay k nallamothu 3 0.04% 1 1.01%
satyam sharma satyam sharma 3 0.04% 1 1.01%
tejun heo tejun heo 3 0.04% 1 1.01%
yang yingliang yang yingliang 3 0.04% 2 2.02%
ilpo jarvinen ilpo jarvinen 3 0.04% 1 1.01%
daniel borkmann daniel borkmann 3 0.04% 1 1.01%
panagiotis issaris* panagiotis issaris* 1 0.01% 1 1.01%
hideaki yoshifuji hideaki yoshifuji 1 0.01% 1 1.01%
steven cole steven cole 1 0.01% 1 1.01%
Total 8354 100.00% 99 100.00%
  Directory: net/sched

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
patrick mchardy	patrick mchardy	20	37.04%	1	25.00%
eric dumazet	eric dumazet	18	33.33%	1	25.00%
pre-git	pre-git	16	29.63%	2	50.00%
	Total	54	100.00%	4	100.00%
cregit-Linux how code gets into the kernel

Release 4.8 net/sched/sch_cbq.c

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