Release 4.8 net/sched/sch_prio.c

Directory: net/sched
/*
 * net/sched/sch_prio.c Simple 3-band priority "scheduler".
 *
 *              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>
 * Fixes:       19990609: J Hadi Salim <hadi@nortelnetworks.com>:
 *              Init --  EINVAL when opt undefined
 */

#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>



struct prio_sched_data {
	
int bands;
	
struct tcf_proto __rcu *filter_list;
	
u8  prio2band[TC_PRIO_MAX+1];
	
struct Qdisc *queues[TCQ_PRIO_BANDS];
};



static struct Qdisc *

prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	u32 band = skb->priority;
	struct tcf_result res;
	struct tcf_proto *fl;
	int err;

	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
	if (TC_H_MAJ(skb->priority) != sch->handle) {
		fl = rcu_dereference_bh(q->filter_list);
		err = tc_classify(skb, fl, &res, false);
#ifdef CONFIG_NET_CLS_ACT
		switch (err) {
		case TC_ACT_STOLEN:
		case TC_ACT_QUEUED:
			*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
		case TC_ACT_SHOT:
			return NULL;
		}
#endif
		if (!fl || err < 0) {
			if (TC_H_MAJ(band))
				band = 0;
			return q->queues[q->prio2band[band & TC_PRIO_MAX]];
		}
		band = res.classid;
	}
	band = TC_H_MIN(band) - 1;
	if (band >= q->bands)
		return q->queues[q->prio2band[0]];

	return q->queues[band];
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 91 43.96% 3 18.75%
jamal hadi salim jamal hadi salim 44 21.26% 3 18.75%
patrick mchardy patrick mchardy 30 14.49% 2 12.50%
john fastabend john fastabend 16 7.73% 1 6.25%
david s. miller david s. miller 14 6.76% 1 6.25%
jarek poplawski jarek poplawski 5 2.42% 2 12.50%
stephen hemminger stephen hemminger 3 1.45% 1 6.25%
daniel borkmann daniel borkmann 2 0.97% 1 6.25%
lucas nussbaum lucas nussbaum 1 0.48% 1 6.25%
adrian bunk adrian bunk 1 0.48% 1 6.25%
Total 207 100.00% 16 100.00%


static int

prio_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct sk_buff **to_free)
{
	struct Qdisc *qdisc;
	int ret;

	qdisc = prio_classify(skb, sch, &ret);
#ifdef CONFIG_NET_CLS_ACT
	if (qdisc == NULL) {

		if (ret & __NET_XMIT_BYPASS)
			qdisc_qstats_drop(sch);
		kfree_skb(skb);
		return ret;
	}
#endif

	ret = qdisc_enqueue(skb, qdisc, to_free);
	if (ret == NET_XMIT_SUCCESS) {
		qdisc_qstats_backlog_inc(sch, skb);
		sch->q.qlen++;
		return NET_XMIT_SUCCESS;
	}
	if (net_xmit_drop_count(ret))
		qdisc_qstats_drop(sch);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 50 40.00% 3 25.00%
patrick mchardy patrick mchardy 23 18.40% 1 8.33%
jamal hadi salim jamal hadi salim 17 13.60% 2 16.67%
jarek poplawski jarek poplawski 9 7.20% 2 16.67%
eric dumazet eric dumazet 8 6.40% 1 8.33%
americo wang americo wang 7 5.60% 1 8.33%
john fastabend john fastabend 6 4.80% 1 8.33%
jussi kivilinna jussi kivilinna 5 4.00% 1 8.33%
Total 125 100.00% 12 100.00%



static struct sk_buff *prio_peek(struct Qdisc *sch)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	int prio;

	for (prio = 0; prio < q->bands; prio++) {
		struct Qdisc *qdisc = q->queues[prio];
		struct sk_buff *skb = qdisc->ops->peek(qdisc);
		if (skb)
			return skb;
	}
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 79 100.00% 1 100.00%
Total 79 100.00% 1 100.00%



static struct sk_buff *prio_dequeue(struct Qdisc *sch)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	int prio;

	for (prio = 0; prio < q->bands; prio++) {
		struct Qdisc *qdisc = q->queues[prio];
		struct sk_buff *skb = qdisc_dequeue_peeked(qdisc);
		if (skb) {
			qdisc_bstats_update(sch, skb);
			qdisc_qstats_backlog_dec(sch, skb);
			sch->q.qlen--;
			return skb;
		}
	}
	return NULL;

}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 49 50.00% 1 14.29%
peter p waskiewicz peter p waskiewicz 25 25.51% 1 14.29%
americo wang americo wang 7 7.14% 1 14.29%
eric dumazet eric dumazet 7 7.14% 1 14.29%
david s. miller david s. miller 6 6.12% 1 14.29%
stephen hemminger stephen hemminger 3 3.06% 1 14.29%
florian westphal florian westphal 1 1.02% 1 14.29%
Total 98 100.00% 7 100.00%


static void

prio_reset(struct Qdisc *sch)
{
	int prio;
	struct prio_sched_data *q = qdisc_priv(sch);

	for (prio = 0; prio < q->bands; prio++)
		qdisc_reset(q->queues[prio]);
	sch->qstats.backlog = 0;
	sch->q.qlen = 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 54 83.08% 2 50.00%
americo wang americo wang 8 12.31% 1 25.00%
stephen hemminger stephen hemminger 3 4.62% 1 25.00%
Total 65 100.00% 4 100.00%


static void

prio_destroy(struct Qdisc *sch)
{
	int prio;
	struct prio_sched_data *q = qdisc_priv(sch);

	tcf_destroy_chain(&q->filter_list);
	for (prio = 0; prio < q->bands; prio++)
		qdisc_destroy(q->queues[prio]);
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 46 80.70% 1 20.00%
david s. miller david s. miller 5 8.77% 1 20.00%
patrick mchardy patrick mchardy 3 5.26% 2 40.00%
stephen hemminger stephen hemminger 3 5.26% 1 20.00%
Total 57 100.00% 5 100.00%



static int prio_tune(struct Qdisc *sch, struct nlattr *opt)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	struct Qdisc *queues[TCQ_PRIO_BANDS];
	int oldbands = q->bands, i;
	struct tc_prio_qopt *qopt;

	if (nla_len(opt) < sizeof(*qopt))
		return -EINVAL;
	qopt = nla_data(opt);

	if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2)
		return -EINVAL;

	for (i = 0; i <= TC_PRIO_MAX; i++) {
		if (qopt->priomap[i] >= qopt->bands)
			return -EINVAL;
	}

	/* Before commit, make sure we can allocate all new qdiscs */
	for (i = oldbands; i < qopt->bands; i++) {
		queues[i] = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
					      TC_H_MAKE(sch->handle, i + 1));
		if (!queues[i]) {
			while (i > oldbands)
				qdisc_destroy(queues[--i]);
			return -ENOMEM;
		}
	}

	sch_tree_lock(sch);
	q->bands = qopt->bands;
	memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1);

	for (i = q->bands; i < oldbands; i++) {
		struct Qdisc *child = q->queues[i];

		qdisc_tree_reduce_backlog(child, child->q.qlen,
					  child->qstats.backlog);
		qdisc_destroy(child);
	}

	for (i = oldbands; i < q->bands; i++)
		q->queues[i] = queues[i];

	sch_tree_unlock(sch);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 156 50.49% 4 26.67%
eric dumazet eric dumazet 91 29.45% 1 6.67%
david s. miller david s. miller 21 6.80% 2 13.33%
patrick mchardy patrick mchardy 14 4.53% 4 26.67%
peter p waskiewicz peter p waskiewicz 11 3.56% 1 6.67%
americo wang americo wang 7 2.27% 1 6.67%
amnon aaronsohn amnon aaronsohn 6 1.94% 1 6.67%
stephen hemminger stephen hemminger 3 0.97% 1 6.67%
Total 309 100.00% 15 100.00%



static int prio_init(struct Qdisc *sch, struct nlattr *opt)
{
	if (!opt)
		return -EINVAL;

	return prio_tune(sch, opt);
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 30 90.91% 4 66.67%
eric dumazet eric dumazet 2 6.06% 1 16.67%
patrick mchardy patrick mchardy 1 3.03% 1 16.67%
Total 33 100.00% 6 100.00%



static int prio_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	unsigned char *b = skb_tail_pointer(skb);
	struct tc_prio_qopt opt;

	opt.bands = q->bands;
	memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX + 1);

	if (nla_put(skb, TCA_OPTIONS, 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 87 85.29% 1 16.67%
david s. miller david s. miller 7 6.86% 1 16.67%
arnaldo carvalho de melo arnaldo carvalho de melo 4 3.92% 2 33.33%
stephen hemminger stephen hemminger 3 2.94% 1 16.67%
patrick mchardy patrick mchardy 1 0.98% 1 16.67%
Total 102 100.00% 6 100.00%



static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
		      struct Qdisc **old)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	unsigned long band = arg - 1;

	if (new == NULL)
		new = &noop_qdisc;

	*old = qdisc_replace(sch, new, &q->queues[band]);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 66 86.84% 1 33.33%
americo wang americo wang 7 9.21% 1 33.33%
stephen hemminger stephen hemminger 3 3.95% 1 33.33%
Total 76 100.00% 3 100.00%


static struct Qdisc *

prio_leaf(struct Qdisc *sch, unsigned long arg)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	unsigned long band = arg - 1;

	return q->queues[band];
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 40 93.02% 1 50.00%
stephen hemminger stephen hemminger 3 6.98% 1 50.00%
Total 43 100.00% 2 100.00%



static unsigned long prio_get(struct Qdisc *sch, u32 classid)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	unsigned long band = TC_H_MIN(classid);

	if (band - 1 >= q->bands)
		return 0;
	return band;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 47 94.00% 1 50.00%
stephen hemminger stephen hemminger 3 6.00% 1 50.00%
Total 50 100.00% 2 100.00%



static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid)
{
	return prio_get(sch, classid);
}


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pre-git pre-git 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%



static void prio_put(struct Qdisc *q, unsigned long cl)
{
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 13 92.86% 1 50.00%
joe perches joe perches 1 7.14% 1 50.00%
Total 14 100.00% 2 100.00%



static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb,
			   struct tcmsg *tcm)
{
	struct prio_sched_data *q = qdisc_priv(sch);

	tcm->tcm_handle |= TC_H_MIN(cl);
	tcm->tcm_info = q->queues[cl-1]->handle;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 50 80.65% 2 50.00%
alexey kuznetsov alexey kuznetsov 9 14.52% 1 25.00%
stephen hemminger stephen hemminger 3 4.84% 1 25.00%
Total 62 100.00% 4 100.00%



static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
				 struct gnet_dump *d)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	struct Qdisc *cl_q;

	cl_q = q->queues[cl - 1];
	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
				  d, NULL, &cl_q->bstats) < 0 ||
	    gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
		return -1;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
jarek poplawski jarek poplawski 79 84.04% 1 20.00%
john fastabend john fastabend 10 10.64% 3 60.00%
eric dumazet eric dumazet 5 5.32% 1 20.00%
Total 94 100.00% 5 100.00%



static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
{
	struct prio_sched_data *q = qdisc_priv(sch);
	int prio;

	if (arg->stop)
		return;

	for (prio = 0; prio < q->bands; prio++) {
		if (arg->count < arg->skip) {
			arg->count++;
			continue;
		}
		if (arg->fn(sch, prio + 1, arg) < 0) {
			arg->stop = 1;
			break;
		}
		arg->count++;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 99 97.06% 2 66.67%
stephen hemminger stephen hemminger 3 2.94% 1 33.33%
Total 102 100.00% 3 100.00%



static struct tcf_proto __rcu **prio_find_tcf(struct Qdisc *sch,
					      unsigned long cl)
{
	struct prio_sched_data *q = qdisc_priv(sch);

	if (cl)
		return NULL;
	return &q->filter_list;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 38 90.48% 1 33.33%
stephen hemminger stephen hemminger 3 7.14% 1 33.33%
john fastabend john fastabend 1 2.38% 1 33.33%
Total 42 100.00% 3 100.00%


static const struct Qdisc_class_ops prio_class_ops = {
	.graft		=	prio_graft,
	.leaf		=	prio_leaf,
	.get		=	prio_get,
	.put		=	prio_put,
	.walk		=	prio_walk,
	.tcf_chain	=	prio_find_tcf,
	.bind_tcf	=	prio_bind,
	.unbind_tcf	=	prio_put,
	.dump		=	prio_dump_class,
	.dump_stats	=	prio_dump_class_stats,
};


static struct Qdisc_ops prio_qdisc_ops __read_mostly = {
	.next		=	NULL,
	.cl_ops		=	&prio_class_ops,
	.id		=	"prio",
	.priv_size	=	sizeof(struct prio_sched_data),
	.enqueue	=	prio_enqueue,
	.dequeue	=	prio_dequeue,
	.peek		=	prio_peek,
	.init		=	prio_init,
	.reset		=	prio_reset,
	.destroy	=	prio_destroy,
	.change		=	prio_tune,
	.dump		=	prio_dump,
	.owner		=	THIS_MODULE,
};



static int __init prio_module_init(void)
{
	return register_qdisc(&prio_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 prio_module_exit(void)
{
	unregister_qdisc(&prio_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(prio_module_init)
module_exit(prio_module_exit)

MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 1074 58.91% 6 10.34%
patrick mchardy patrick mchardy 156 8.56% 9 15.52%
eric dumazet eric dumazet 115 6.31% 5 8.62%
jarek poplawski jarek poplawski 98 5.38% 3 5.17%
jamal hadi salim jamal hadi salim 61 3.35% 3 5.17%
david s. miller david s. miller 58 3.18% 5 8.62%
dave jones dave jones 38 2.08% 1 1.72%
stephen hemminger stephen hemminger 36 1.97% 1 1.72%
peter p waskiewicz peter p waskiewicz 36 1.97% 1 1.72%
americo wang americo wang 36 1.97% 3 5.17%
john fastabend john fastabend 34 1.87% 5 8.62%
art haas art haas 22 1.21% 1 1.72%
al viro al viro 15 0.82% 1 1.72%
alexey kuznetsov alexey kuznetsov 9 0.49% 1 1.72%
arnaldo carvalho de melo arnaldo carvalho de melo 7 0.38% 2 3.45%
linus torvalds linus torvalds 7 0.38% 2 3.45%
amnon aaronsohn amnon aaronsohn 6 0.33% 1 1.72%
jussi kivilinna jussi kivilinna 5 0.27% 1 1.72%
tejun heo tejun heo 3 0.16% 1 1.72%
daniel borkmann daniel borkmann 2 0.11% 1 1.72%
joe perches joe perches 1 0.05% 1 1.72%
adrian bunk adrian bunk 1 0.05% 1 1.72%
lucas nussbaum lucas nussbaum 1 0.05% 1 1.72%
hideaki yoshifuji hideaki yoshifuji 1 0.05% 1 1.72%
florian westphal florian westphal 1 0.05% 1 1.72%
Total 1823 100.00% 58 100.00%
  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
pre-git	pre-git	91	43.96%	3	18.75%
jamal hadi salim	jamal hadi salim	44	21.26%	3	18.75%
patrick mchardy	patrick mchardy	30	14.49%	2	12.50%
john fastabend	john fastabend	16	7.73%	1	6.25%
david s. miller	david s. miller	14	6.76%	1	6.25%
jarek poplawski	jarek poplawski	5	2.42%	2	12.50%
stephen hemminger	stephen hemminger	3	1.45%	1	6.25%
daniel borkmann	daniel borkmann	2	0.97%	1	6.25%
lucas nussbaum	lucas nussbaum	1	0.48%	1	6.25%
adrian bunk	adrian bunk	1	0.48%	1	6.25%
	Total	207	100.00%	16	100.00%
cregit-Linux how code gets into the kernel

Release 4.8 net/sched/sch_prio.c

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