cregit-Linux how code gets into the kernel

Release 4.16 net/sched/sch_api.c

Directory: net/sched
/*
 * net/sched/sch_api.c  Packet scheduler API.
 *
 *              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:
 *
 * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired.
 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
 * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/kmod.h>
#include <linux/list.h>
#include <linux/hrtimer.h>
#include <linux/lockdep.h>
#include <linux/slab.h>
#include <linux/hashtable.h>

#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>

/*

   Short review.
   -------------

   This file consists of two interrelated parts:

   1. queueing disciplines manager frontend.
   2. traffic classes manager frontend.

   Generally, queueing discipline ("qdisc") is a black box,
   which is able to enqueue packets and to dequeue them (when
   device is ready to send something) in order and at times
   determined by algorithm hidden in it.

   qdisc's are divided to two categories:
   - "queues", which have no internal structure visible from outside.
   - "schedulers", which split all the packets to "traffic classes",
     using "packet classifiers" (look at cls_api.c)

   In turn, classes may have child qdiscs (as rule, queues)
   attached to them etc. etc. etc.

   The goal of the routines in this file is to translate
   information supplied by user in the form of handles
   to more intelligible for kernel form, to make some sanity
   checks and part of work, which is common to all qdiscs
   and to provide rtnetlink notifications.

   All real intelligent work is done inside qdisc modules.



   Every discipline has two major routines: enqueue and dequeue.

   ---dequeue

   dequeue usually returns a skb to send. It is allowed to return NULL,
   but it does not mean that queue is empty, it just means that
   discipline does not want to send anything this time.
   Queue is really empty if q->q.qlen == 0.
   For complicated disciplines with multiple queues q->q is not
   real packet queue, but however q->q.qlen must be valid.

   ---enqueue

   enqueue returns 0, if packet was enqueued successfully.
   If packet (this one or another one) was dropped, it returns
   not zero error code.
   NET_XMIT_DROP        - this packet dropped
     Expected action: do not backoff, but wait until queue will clear.
   NET_XMIT_CN          - probably this packet enqueued, but another one dropped.
     Expected action: backoff or ignore

   Auxiliary routines:

   ---peek

   like dequeue but without removing a packet from the queue

   ---reset

   returns qdisc to initial state: purge all buffers, clear all
   timers, counters (except for statistics) etc.

   ---init

   initializes newly created qdisc.

   ---destroy

   destroys resources allocated by init and during lifetime of qdisc.

   ---change

   changes qdisc parameters.
 */

/* Protects list of registered TC modules. It is pure SMP lock. */
static DEFINE_RWLOCK(qdisc_mod_lock);


/************************************************
 *      Queueing disciplines manipulation.      *
 ************************************************/


/* The list of all installed queueing disciplines. */


static struct Qdisc_ops *qdisc_base;

/* Register/unregister queueing discipline */




int register_qdisc(struct Qdisc_ops *qops)
{
	struct Qdisc_ops *q, **qp;
	int rc = -EEXIST;

	write_lock(&qdisc_mod_lock);
	for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
		if (!strcmp(qops->id, q->id))
			goto out;

	if (qops->enqueue == NULL)
		qops->enqueue = noop_qdisc_ops.enqueue;
	if (qops->peek == NULL) {
		if (qops->dequeue == NULL)
			qops->peek = noop_qdisc_ops.peek;
		else
			goto out_einval;
	}
	if (qops->dequeue == NULL)
		qops->dequeue = noop_qdisc_ops.dequeue;

	if (qops->cl_ops) {
		const struct Qdisc_class_ops *cops = qops->cl_ops;

		if (!(cops->find && cops->walk && cops->leaf))
			goto out_einval;

		if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf))
			goto out_einval;
	}

	qops->next = NULL;
	*qp = qops;
	rc = 0;
out:
	write_unlock(&qdisc_mod_lock);
	return rc;

out_einval:
	rc = -EINVAL;
	goto out;
}

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Linus Torvalds (pre-git)11249.34%225.00%


Jarek Poplawski9642.29%337.50%


Arnaldo Carvalho de Melo177.49%112.50%


Jiri Pirko10.44%112.50%


Américo Wang10.44%112.50%


Total227100.00%8100.00%



EXPORT_SYMBOL(register_qdisc);




int unregister_qdisc(struct Qdisc_ops *qops)
{
	struct Qdisc_ops *q, **qp;
	int err = -ENOENT;

	write_lock(&qdisc_mod_lock);
	for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
		if (q == qops)
			break;
	if (q) {
		*qp = q->next;
		q->next = NULL;
		err = 0;
	}
	write_unlock(&qdisc_mod_lock);
	return err;
}

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Total93100.00%2100.00%



EXPORT_SYMBOL(unregister_qdisc);

/* Get default qdisc if not otherwise specified */



void qdisc_get_default(char *name, size_t len)
{
	read_lock(&qdisc_mod_lock);
	strlcpy(name, default_qdisc_ops->id, len);
	read_unlock(&qdisc_mod_lock);
}


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Total35100.00%1100.00%






static struct Qdisc_ops *qdisc_lookup_default(const char *name)
{
	struct Qdisc_ops *q = NULL;

	for (q = qdisc_base; q; q = q->next) {
		if (!strcmp(name, q->id)) {
			if (!try_module_get(q->owner))
				q = NULL;
			break;
		}
	}

	return q;
}


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Total68100.00%1100.00%



/* Set new default qdisc to use */



int qdisc_set_default(const char *name)
{
	const struct Qdisc_ops *ops;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	write_lock(&qdisc_mod_lock);
	ops = qdisc_lookup_default(name);
	if (!ops) {
		/* Not found, drop lock and try to load module */
		write_unlock(&qdisc_mod_lock);
		request_module("sch_%s", name);
		write_lock(&qdisc_mod_lock);

		ops = qdisc_lookup_default(name);
	}

	if (ops) {
		/* Set new default */
		module_put(default_qdisc_ops->owner);
		default_qdisc_ops = ops;
	}
	write_unlock(&qdisc_mod_lock);

	return ops ? 0 : -ENOENT;
}


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Stephen Hemminger107100.00%1100.00%


Total107100.00%1100.00%



#ifdef CONFIG_NET_SCH_DEFAULT
/* Set default value from kernel config */



static int __init sch_default_qdisc(void)
{
	return qdisc_set_default(CONFIG_DEFAULT_NET_SCH);
}

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Total15100.00%1100.00%



late_initcall(sch_default_qdisc);
#endif

/* We know handle. Find qdisc among all qdisc's attached to device
 * (root qdisc, all its children, children of children etc.)
 * Note: caller either uses rtnl or rcu_read_lock()
 */




static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
{
	struct Qdisc *q;

	if (!qdisc_dev(root))
		return (root->handle == handle ? root : NULL);

	if (!(root->flags & TCQ_F_BUILTIN) &&
	    root->handle == handle)
		return root;

	hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) {
		if (q->handle == handle)
			return q;
	}
	return NULL;
}


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Jiri Kosina2629.55%250.00%


Hannes Eder11.14%125.00%


Total88100.00%4100.00%






void qdisc_hash_add(struct Qdisc *q, bool invisible)
{
	if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
		ASSERT_RTNL();
		hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle);
		if (invisible)
			q->flags |= TCQ_F_INVISIBLE;
	}
}

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Jiri Kosina2537.88%233.33%


Eric Dumazet2436.36%233.33%


Jarek Poplawski1624.24%116.67%


Patrick McHardy11.52%116.67%


Total66100.00%6100.00%



EXPORT_SYMBOL(qdisc_hash_add);




void qdisc_hash_del(struct Qdisc *q)
{
	if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
		ASSERT_RTNL();
		hash_del_rcu(&q->hash);
	}
}

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Jarek Poplawski3480.95%133.33%


Eric Dumazet511.90%133.33%


Jiri Kosina37.14%133.33%


Total42100.00%3100.00%



EXPORT_SYMBOL(qdisc_hash_del);




struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
{
	struct Qdisc *q;

	if (!handle)
		return NULL;
	q = qdisc_match_from_root(dev->qdisc, handle);
	if (q)
		goto out;

	if (dev_ingress_queue(dev))
		q = qdisc_match_from_root(
			dev_ingress_queue(dev)->qdisc_sleeping,
			handle);
out:
	return q;
}


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David S. Miller1622.22%220.00%


Linus Torvalds (pre-git)1520.83%110.00%


Jarek Poplawski1520.83%220.00%


Eric Dumazet1013.89%110.00%


Patrick McHardy811.11%330.00%


Américo Wang811.11%110.00%


Total72100.00%10100.00%






static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
{
	unsigned long cl;
	struct Qdisc *leaf;
	const struct Qdisc_class_ops *cops = p->ops->cl_ops;

	if (cops == NULL)
		return NULL;
	cl = cops->find(p, classid);

	if (cl == 0)
		return NULL;
	leaf = cops->leaf(p, cl);
	return leaf;
}


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Linus Torvalds (pre-git)7796.25%240.00%


Adrian Bunk11.25%120.00%


Eric Dumazet11.25%120.00%


Américo Wang11.25%120.00%


Total80100.00%5100.00%



/* Find queueing discipline by name */




static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
{
	struct Qdisc_ops *q = NULL;

	if (kind) {
		read_lock(&qdisc_mod_lock);
		for (q = qdisc_base; q; q = q->next) {
			if (nla_strcmp(kind, q->id) == 0) {
				if (!try_module_get(q->owner))
					q = NULL;
				break;
			}
		}
		read_unlock(&qdisc_mod_lock);
	}
	return q;
}


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Linus Torvalds (pre-git)6878.16%240.00%


Patrick McHardy1820.69%240.00%


Adrian Bunk11.15%120.00%


Total87100.00%5100.00%



/* The linklayer setting were not transferred from iproute2, in older
 * versions, and the rate tables lookup systems have been dropped in
 * the kernel. To keep backward compatible with older iproute2 tc
 * utils, we detect the linklayer setting by detecting if the rate
 * table were modified.
 *
 * For linklayer ATM table entries, the rate table will be aligned to
 * 48 bytes, thus some table entries will contain the same value.  The
 * mpu (min packet unit) is also encoded into the old rate table, thus
 * starting from the mpu, we find low and high table entries for
 * mapping this cell.  If these entries contain the same value, when
 * the rate tables have been modified for linklayer ATM.
 *
 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
 * and then roundup to the next cell, calc the table entry one below,
 * and compare.
 */



static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
{
	int low       = roundup(r->mpu, 48);
	int high      = roundup(low+1, 48);
	int cell_low  = low >> r->cell_log;
	int cell_high = (high >> r->cell_log) - 1;

	/* rtab is too inaccurate at rates > 100Mbit/s */
	if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
		pr_debug("TC linklayer: Giving up ATM detection\n");
		return TC_LINKLAYER_ETHERNET;
	}

	if ((cell_high > cell_low) && (cell_high < 256)
	    && (rtab[cell_low] == rtab[cell_high])) {
		pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
			 cell_low, cell_high, rtab[cell_high]);
		return TC_LINKLAYER_ATM;
	}
	return TC_LINKLAYER_ETHERNET;
}


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Total143100.00%1100.00%




static struct qdisc_rate_table *qdisc_rtab_list;




struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
					struct nlattr *tab,
					struct netlink_ext_ack *extack)
{
	struct qdisc_rate_table *rtab;

	if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
	    nla_len(tab) != TC_RTAB_SIZE) {
		NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching");
		return NULL;
	}

	for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
		if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
		    !memcmp(&rtab->data, nla_data(tab), 1024)) {
			rtab->refcnt++;
			return rtab;
		}
	}

	rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
	if (rtab) {
		rtab->rate = *r;
		rtab->refcnt = 1;
		memcpy(rtab->data, nla_data(tab), 1024);
		if (r->linklayer == TC_LINKLAYER_UNAWARE)
			r->linklayer = __detect_linklayer(r, rtab->data);
		rtab->next = qdisc_rtab_list;
		qdisc_rtab_list = rtab;
	} else {
		NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table");
	}
	return rtab;
}

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Linus Torvalds (pre-git)12357.21%120.00%


Eric Dumazet4520.93%120.00%


Alexander Aring2411.16%120.00%


Jesper Dangaard Brouer219.77%120.00%


Patrick McHardy20.93%120.00%


Total215100.00%5100.00%



EXPORT_SYMBOL(qdisc_get_rtab);




void qdisc_put_rtab(struct qdisc_rate_table *tab)
{
	struct qdisc_rate_table *rtab, **rtabp;

	if (!tab || --tab->refcnt)
		return;

	for (rtabp = &qdisc_rtab_list;
	     (rtab = *rtabp) != NULL;
	     rtabp = &rtab->next) {
		if (rtab == tab) {
			*rtabp = rtab->next;
			kfree(rtab);
			return;
		}
	}
}

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Total76100.00%1100.00%



EXPORT_SYMBOL(qdisc_put_rtab);

static LIST_HEAD(qdisc_stab_list);


static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
	[TCA_STAB_BASE]	= { .len = sizeof(struct tc_sizespec) },
	[TCA_STAB_DATA] = { .type = NLA_BINARY },
};




static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
					       struct netlink_ext_ack *extack)
{
	struct nlattr *tb[TCA_STAB_MAX + 1];
	struct qdisc_size_table *stab;
	struct tc_sizespec *s;
	unsigned int tsize = 0;
	u16 *tab = NULL;
	int err;

	err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, extack);
	if (err < 0)
		return ERR_PTR(err);
	if (!tb[TCA_STAB_BASE]) {
		NL_SET_ERR_MSG(extack, "Size table base attribute is missing");
		return ERR_PTR(-EINVAL);
	}

	s = nla_data(tb[TCA_STAB_BASE]);

	if (s->tsize > 0) {
		if (!tb[TCA_STAB_DATA]) {
			NL_SET_ERR_MSG(extack, "Size table data attribute is missing");
			return ERR_PTR(-EINVAL);
		}
		tab = nla_data(tb[TCA_STAB_DATA]);
		tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
	}

	if (tsize != s->tsize || (!tab && tsize > 0)) {
		NL_SET_ERR_MSG(extack, "Invalid size of size table");
		return ERR_PTR(-EINVAL);
	}

	list_for_each_entry(stab, &qdisc_stab_list, list) {
		if (memcmp(&stab->szopts, s, sizeof(*s)))
			continue;
		if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
			continue;
		stab->refcnt++;
		return stab;
	}

	stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
	if (!stab)
		return ERR_PTR(-ENOMEM);

	stab->refcnt = 1;
	stab->szopts = *s;
	if (tsize > 0)
		memcpy(stab->data, tab, tsize * sizeof(u16));

	list_add_tail(&stab->list, &qdisc_stab_list);

	return stab;
}


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Total347100.00%3100.00%






static void stab_kfree_rcu(struct rcu_head *head)
{
	kfree(container_of(head, struct qdisc_size_table, rcu));
}


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void qdisc_put_stab(struct qdisc_size_table *tab)
{
	if (!tab)
		return;

	if (--tab->refcnt == 0) {
		list_del(&tab->list);
		call_rcu_bh(&tab->rcu, stab_kfree_rcu);
	}
}

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Jussi Kivilinna3986.67%150.00%


Eric Dumazet613.33%150.00%


Total45100.00%2100.00%



EXPORT_SYMBOL(qdisc_put_stab);




static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
{
	struct nlattr *nest;

	nest = nla_nest_start(skb, TCA_STAB);
	if (nest == NULL)
		goto nla_put_failure;
	if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
		goto nla_put_failure;
	nla_nest_end(skb, nest);

	return skb->len;

nla_put_failure:
	return -1;
}


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Patrick McHardy911.11%133.33%


David S. Miller78.64%133.33%


Total81100.00%3100.00%






void __qdisc_calculate_pkt_len(struct sk_buff *skb,
			       const struct qdisc_size_table *stab)
{
	int pkt_len, slot;

	pkt_len = skb->len + stab->szopts.overhead;
	if (unlikely(!stab->szopts.tsize))
		goto out;

	slot = pkt_len + stab->szopts.cell_align;
	if (unlikely(slot < 0))
		slot = 0;

	slot >>= stab->szopts.cell_log;
	if (likely(slot < stab->szopts.tsize))
		pkt_len = stab->data[slot];
	else
		pkt_len = stab->data[stab->szopts.tsize - 1] *
				(slot / stab->szopts.tsize) +
				stab->data[slot % stab->szopts.tsize];

	pkt_len <<= stab->szopts.size_log;
out:
	if (unlikely(pkt_len < 1))
		pkt_len = 1;
	qdisc_skb_cb(skb)->pkt_len = pkt_len;
}

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Eric Dumazet21.16%150.00%


Total172100.00%2100.00%



EXPORT_SYMBOL(__qdisc_calculate_pkt_len);




void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
{
	if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
		pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
			txt, qdisc->ops->id, qdisc->handle >> 16);
		qdisc->flags |= TCQ_F_WARN_NONWC;
	}
}

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Florian Westphal11.89%133.33%


Eric Dumazet11.89%133.33%


Total53100.00%3100.00%



EXPORT_SYMBOL(qdisc_warn_nonwc);




static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
{
	struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
						 timer);

	rcu_read_lock();
	__netif_schedule(qdisc_root(wd->qdisc));
	rcu_read_unlock();

	return HRTIMER_NORESTART;
}


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John Fastabend613.04%120.00%


Stephen Hemminger12.17%120.00%


Total46100.00%5100.00%






void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
{
	hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
	wd->timer.function = qdisc_watchdog;
	wd->qdisc = qdisc;
}

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Patrick McHardy3175.61%133.33%


David S. Miller921.95%133.33%


Eric Dumazet12.44%133.33%


Total41100.00%3100.00%



EXPORT_SYMBOL(qdisc_watchdog_init);




void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
{
	if (test_bit(__QDISC_STATE_DEACTIVATED,
		     &qdisc_root_sleeping(wd->qdisc)->state))
		return;

	if (wd->last_expires == expires)
		return;

	wd->last_expires = expires;
	hrtimer_start(&wd->timer,
		      ns_to_ktime(expires),
		      HRTIMER_MODE_ABS_PINNED);
}

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Eric Dumazet2236.07%457.14%


Patrick McHardy1931.15%114.29%


Jarek Poplawski1829.51%114.29%


Jiri Pirko23.28%114.29%


Total61100.00%7100.00%



EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);




void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
{
	hrtimer_cancel(&wd->timer);
}

Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy1794.44%150.00%


David S. Miller15.56%150.00%


Total18100.00%2100.00%



EXPORT_SYMBOL(qdisc_watchdog_cancel);




static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
{
	struct hlist_head *h;
	unsigned int i;

	h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL);

	if (h != NULL) {
		for (i = 0; i < n; i++)
			INIT_HLIST_HEAD(&h[i]);
	}
	return h;
}


Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy5884.06%133.33%


Eric Dumazet1014.49%133.33%


Adrian Bunk11.45%133.33%


Total69100.00%3100.00%






void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
{
	struct Qdisc_class_common *cl;
	struct hlist_node *next;
	struct hlist_head *nhash, *ohash;
	unsigned int nsize, nmask, osize;
	unsigned int i, h;

	/* Rehash when load factor exceeds 0.75 */
	if (clhash->hashelems * 4 <= clhash->hashsize * 3)
		return;
	nsize = clhash->hashsize * 2;
	nmask = nsize - 1;
	nhash = qdisc_class_hash_alloc(nsize);
	if (nhash == NULL)
		return;

	ohash = clhash->hash;
	osize = clhash->hashsize;

	sch_tree_lock(sch);
	for (i = 0; i < osize; i++) {
		hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
			h = qdisc_class_hash(cl->classid, nmask);
			hlist_add_head(&cl->hnode, &nhash[h]);
		}
	}
	clhash->hash     = nhash;
	clhash->hashsize = nsize;
	clhash->hashmask = nmask;
	sch_tree_unlock(sch);

	kvfree(ohash);
}

Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy18799.47%150.00%


Eric Dumazet10.53%150.00%


Total188100.00%2100.00%



EXPORT_SYMBOL(qdisc_class_hash_grow);




int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
{
	unsigned int size = 4;

	clhash->hash = qdisc_class_hash_alloc(size);
	if (!clhash->hash)
		return -ENOMEM;
	clhash->hashsize  = size;
	clhash->hashmask  = size - 1;
	clhash->hashelems = 0;
	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy5898.31%150.00%


Alexander Aring11.69%150.00%


Total59100.00%2100.00%



EXPORT_SYMBOL(qdisc_class_hash_init);




void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
{
	kvfree(clhash->hash);
}

Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy1694.12%150.00%


Eric Dumazet15.88%150.00%


Total17100.00%2100.00%



EXPORT_SYMBOL(qdisc_class_hash_destroy);




void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
			     struct Qdisc_class_common *cl)
{
	unsigned int h;

	INIT_HLIST_NODE(&cl->hnode);
	h = qdisc_class_hash(cl->classid, clhash->hashmask);
	hlist_add_head(&cl->hnode, &clhash->hash[h]);
	clhash->hashelems++;
}

Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy61100.00%1100.00%


Total61100.00%1100.00%



EXPORT_SYMBOL(qdisc_class_hash_insert);




void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
			     struct Qdisc_class_common *cl)
{
	hlist_del(&cl->hnode);
	clhash->hashelems--;
}

Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy28100.00%1100.00%


Total28100.00%1100.00%



EXPORT_SYMBOL(qdisc_class_hash_remove);

/* Allocate an unique handle from space managed by kernel
 * Possible range is [8000-FFFF]:0000 (0x8000 values)
 */



static u32 qdisc_alloc_handle(struct net_device *dev)
{
	int i = 0x8000;
	static u32 autohandle = TC_H_MAKE(0x80000000U, 0);

	do {
		autohandle += TC_H_MAKE(0x10000U, 0);
		if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
			autohandle = TC_H_MAKE(0x80000000U, 0);
		if (!qdisc_lookup(dev, autohandle))
			return autohandle;
		cond_resched();
	} while	(--i > 0);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7283.72%250.00%


Eric Dumazet1315.12%125.00%


Adrian Bunk11.16%125.00%


Total86100.00%4100.00%






void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n,
			       unsigned int len)
{
	const struct Qdisc_class_ops *cops;
	unsigned long cl;
	u32 parentid;
	bool notify;
	int drops;

	if (n == 0 && len == 0)
		return;
	drops = max_t(int, n, 0);
	rcu_read_lock();
	while ((parentid = sch->parent)) {
		if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
			break;

		if (sch->flags & TCQ_F_NOPARENT)
			break;
		/* Notify parent qdisc only if child qdisc becomes empty.
                 *
                 * If child was empty even before update then backlog
                 * counter is screwed and we skip notification because
                 * parent class is already passive.
                 */
		notify = !sch->q.qlen && !WARN_ON_ONCE(!n);
		/* TODO: perform the search on a per txq basis */
		sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
		if (sch == NULL) {
			WARN_ON_ONCE(parentid != TC_H_ROOT);
			break;
		}
		cops = sch->ops->cl_ops;
		if (notify && cops->qlen_notify) {
			cl = cops->find(sch, parentid);
			cops->qlen_notify(sch, cl);
		}
		sch->q.qlen -= n;
		sch->qstats.backlog -= len;
		__qdisc_qstats_drop(sch, drops);
	}
	rcu_read_unlock();
}

Contributors
PersonTokensPropCommitsCommitProp
Patrick McHardy11354.07%325.00%


Eric Dumazet3717.70%325.00%


Konstantin Khlebnikov2210.53%18.33%


Américo Wang188.61%216.67%


Jarek Poplawski125.74%18.33%


John Fastabend41.91%18.33%


David S. Miller31.44%18.33%


Total209100.00%12100.00%



EXPORT_SYMBOL(qdisc_tree_reduce_backlog);




static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
			 u32 portid, u32 seq, u16 flags, int event)
{
	struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
	struct gnet_stats_queue __percpu *cpu_qstats = NULL;
	struct tcmsg *tcm;
	struct nlmsghdr  *nlh;
	unsigned char *b = skb_tail_pointer(skb);
	struct gnet_dump d;
	struct qdisc_size_table *stab;
	u32 block_index;
	__u32 qlen;

	cond_resched();
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
	if (!nlh)
		goto out_nlmsg_trim;
	tcm = nlmsg_data(nlh);
	tcm->tcm_family = AF_UNSPEC;
	tcm->tcm__pad1 = 0;
	tcm->tcm__pad2 = 0;
	tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
	tcm->tcm_parent = clid;
	tcm->tcm_handle = q->handle;
	tcm->tcm_info = refcount_read(&q->refcnt);
	if (nla_put_string(skb, TCA_KIND, q->ops->id))
		goto nla_put_failure;
	if (q->ops->ingress_block_get) {
		block_index = q->ops->ingress_block_get(q);
		if (block_index &&
		    nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index))
			goto nla_put_failure;
	}
	if (q->ops->egress_block_get) {
		block_index = q->ops->egress_block_get(q);
		if (block_index &&
		    nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index))
			goto nla_put_failure;
	}
	if (q->ops->dump && q->ops->dump(q, skb) < 0)
		goto nla_put_failure;
	if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED)))
		goto nla_put_failure;
	qlen = qdisc_qlen_sum(q);

	stab = rtnl_dereference(q->stab);
	if (stab && qdisc_dump_stab(skb, stab) < 0)
		goto nla_put_failure;

	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
					 NULL, &d, TCA_PAD) < 0)
		goto nla_put_failure;

	if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
		goto nla_put_failure;

	if (qdisc_is_percpu_stats(q)) {
		cpu_bstats = q->cpu_bstats;
		cpu_qstats = q->cpu_qstats;
	}

	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q),
				  &d, cpu_bstats, &q->bstats) < 0 ||
	    gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
	    gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
		goto nla_put_failure;

	if (gnet_stats_finish_copy(&d) < 0)
		goto nla_put_failure;

	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
	return skb->len;

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


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang30258.53%214.29%


Jiri Pirko7714.92%17.14%


David S. Miller6111.82%214.29%


Linus Torvalds (pre-git)336.40%214.29%


Nogah Frankel224.26%17.14%


Thomas Goff61.16%17.14%


Jarek Poplawski50.97%17.14%


Eric Dumazet40.78%17.14%


Patrick McHardy30.58%214.29%


John Fastabend30.58%17.14%


Total516100.00%14100.00%






static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
{
	if (q->flags & TCQ_F_BUILTIN)
		return true;
	if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible)
		return true;

	return false;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang4295.45%150.00%


Jarek Poplawski24.55%150.00%


Total44100.00%2100.00%






static int qdisc_notify(struct net *net, struct sk_buff *oskb,
			struct nlmsghdr *n, u32 clid,
			struct Qdisc *old, struct Qdisc *new)
{
	struct sk_buff *skb;
	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb)
		return -ENOBUFS;

	if (old && !tc_qdisc_dump_ignore(old, false)) {
		if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
				  0, RTM_DELQDISC) < 0)
			goto err_out;
	}
	if (new && !tc_qdisc_dump_ignore(new, false)) {
		if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
				  old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
			goto err_out;
	}

	if (skb->len)
		return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
				      n->nlmsg_flags & NLM_F_ECHO);

err_out:
	kfree_skb(skb);
	return -EINVAL;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang12163.68%17.69%


Linus Torvalds (pre-git)3920.53%323.08%


Catalin(ux aka Dino) M. Boie94.74%17.69%


Patrick McHardy73.68%430.77%


Thomas Graf52.63%17.69%


David S. Miller42.11%17.69%


Jarek Poplawski42.11%17.69%


Jussi Kivilinna10.53%17.69%


Total190100.00%13100.00%






static void notify_and_destroy(struct net *net, struct sk_buff *skb,
			       struct nlmsghdr *n, u32 clid,
			       struct Qdisc *old, struct Qdisc *new)
{
	if (new || old)
		qdisc_notify(net, skb, n, clid, old, new);

	if (old)
		qdisc_destroy(old);
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang5179.69%125.00%


Linus Torvalds (pre-git)914.06%125.00%


Jarek Poplawski34.69%125.00%


Patrick McHardy11.56%125.00%


Total64100.00%4100.00%



/* Graft qdisc "new" to class "classid" of qdisc "parent" or
 * to device "dev".
 *
 * When appropriate send a netlink notification using 'skb'
 * and "n".
 *
 * On success, destroy old qdisc.
 */




static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
		       struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
		       struct Qdisc *new, struct Qdisc *old,
		       struct netlink_ext_ack *extack)
{
	struct Qdisc *q = old;
	struct net *net = dev_net(dev);
	int err = 0;

	if (parent == NULL) {
		unsigned int i, num_q, ingress;

		ingress = 0;
		num_q = dev->num_tx_queues;
		if ((q && q->flags & TCQ_F_INGRESS) ||
		    (new && new->flags & TCQ_F_INGRESS)) {
			num_q = 1;
			ingress = 1;
			if (!dev_ingress_queue(dev)) {
				NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
				return -ENOENT;
			}
		}

		if (dev->flags & IFF_UP)
			dev_deactivate(dev);

		if (new && new->ops->attach)
			goto skip;

		for (i = 0; i < num_q; i++) {
			struct netdev_queue *dev_queue = dev_ingress_queue(dev);

			if (!ingress)
				dev_queue = netdev_get_tx_queue(dev, i);

			old = dev_graft_qdisc(dev_queue, new);
			if (new && i > 0)
				qdisc_refcount_inc(new);

			if (!ingress)
				qdisc_destroy(old);
		}

skip:
		if (!ingress) {
			notify_and_destroy(net, skb, n, classid,
					   dev->qdisc, new);
			if (new && !new->ops->attach)
				qdisc_refcount_inc(new);
			dev->qdisc = new ? : &noop_qdisc;

			if (new && new->ops->attach)
				new->ops->attach(new);
		} else {
			notify_and_destroy(net, skb, n, classid, old, new);
		}

		if (dev->flags & IFF_UP)
			dev_activate(dev);
	} else {
		const struct Qdisc_class_ops *cops = parent->ops->cl_ops;

		/* Only support running class lockless if parent is lockless */
		if (new && (new->flags & TCQ_F_NOLOCK) &&
		    parent && !(parent->flags & TCQ_F_NOLOCK))
			new->flags &= ~TCQ_F_NOLOCK;

		err = -EOPNOTSUPP;
		if (cops && cops->graft) {
			unsigned long cl = cops->find(parent, classid);

			if (cl) {
				err = cops->graft(parent, cl, new, &old,
						  extack);
			} else {
				NL_SET_ERR_MSG(extack, "Specified class not found");
				err = -ENOENT;
			}
		}
		if (!err)
			notify_and_destroy(net, skb, n, classid, old, new);
	}
	return err;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang31164.79%28.33%


John Fastabend5010.42%312.50%


Alexander Aring275.62%28.33%


Linus Torvalds (pre-git)163.33%28.33%


Patrick McHardy163.33%28.33%


Jussi Kivilinna153.12%14.17%


Jesper Dangaard Brouer142.92%14.17%


Eric Dumazet102.08%312.50%


Jarek Poplawski71.46%14.17%


David S. Miller51.04%312.50%


Thomas Graf40.83%28.33%


Gao Feng40.83%14.17%


Jiri Kosina10.21%14.17%


Total480100.00%24100.00%






static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca,
				   struct netlink_ext_ack *extack)
{
	u32 block_index;

	if (tca[TCA_INGRESS_BLOCK]) {
		block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]);

		if (!block_index) {
			NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0");
			return -EINVAL;
		}
		if (!sch->ops->ingress_block_set) {
			NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported");
			return -EOPNOTSUPP;
		}
		sch->ops->ingress_block_set(sch, block_index);
	}
	if (tca[TCA_EGRESS_BLOCK]) {
		block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]);

		if (!block_index) {
			NL_SET_ERR_MSG(extack, "Egress block index cannot be 0");
			return -EINVAL;
		}
		if (!sch->ops->egress_block_set) {
			NL_SET_ERR_MSG(extack, "Egress block sharing is not supported");
			return -EOPNOTSUPP;
		}
		sch->ops->egress_block_set(sch, block_index);
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Jiri Pirko168100.00%1100.00%


Total168100.00%1100.00%



/* lockdep annotation is needed for ingress; egress gets it only for name */

static struct lock_class_key qdisc_tx_lock;

static struct lock_class_key qdisc_rx_lock;

/*
   Allocate and initialize new qdisc.

   Parameters are passed via opt.
 */




static struct Qdisc *qdisc_create(struct net_device *dev,
				  struct netdev_queue *dev_queue,
				  struct Qdisc *p, u32 parent, u32 handle,
				  struct nlattr **tca, int *errp,
				  struct netlink_ext_ack *extack)
{
	int err;
	struct nlattr *kind = tca[TCA_KIND];
	struct Qdisc *sch;
	struct Qdisc_ops *ops;
	struct qdisc_size_table *stab;

	ops = qdisc_lookup_ops(kind);
#ifdef CONFIG_MODULES
	if (ops == NULL && kind != NULL) {
		char name[IFNAMSIZ];
		if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
			/* We dropped the RTNL semaphore in order to
                         * perform the module load.  So, even if we
                         * succeeded in loading the module we have to
                         * tell the caller to replay the request.  We
                         * indicate this using -EAGAIN.
                         * We replay the request because the device may
                         * go away in the mean time.
                         */
			rtnl_unlock();
			request_module("sch_%s", name);
			rtnl_lock();
			ops = qdisc_lookup_ops(kind);
			if (ops != NULL) {
				/* We will try again qdisc_lookup_ops,
                                 * so don't keep a reference.
                                 */
				module_put(ops->owner);
				err = -EAGAIN;
				goto err_out;
			}
		}
	}
#endif

	err = -ENOENT;
	if (!ops) {
		NL_SET_ERR_MSG(extack, "Specified qdisc not found");
		goto err_out;
	}

	sch = qdisc_alloc(dev_queue, ops, extack);
	if (IS_ERR(sch)) {
		err = PTR_ERR(sch);
		goto err_out2;
	}

	sch->parent = parent;

	if (handle == TC_H_INGRESS) {
		sch->flags |= TCQ_F_INGRESS;
		handle = TC_H_MAKE(TC_H_INGRESS, 0);
		lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
	} else {
		if (handle == 0) {
			handle = qdisc_alloc_handle(dev);
			err = -ENOMEM;
			if (handle == 0)
				goto err_out3;
		}
		lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
		if (!netif_is_multiqueue(dev))
			sch->flags |= TCQ_F_ONETXQUEUE;
	}

	sch->handle = handle;

	/* This exist to keep backward compatible with a userspace
         * loophole, what allowed userspace to get IFF_NO_QUEUE
         * facility on older kernels by setting tx_queue_len=0 (prior
         * to qdisc init), and then forgot to reinit tx_queue_len
         * before again attaching a qdisc.
         */
	if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) {
		dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
		netdev_info(dev, "Caught tx_queue_len zero misconfig\n");
	}

	err = qdisc_block_indexes_set(sch, tca, extack);
	if (err)
		goto err_out3;

	if (ops->init) {
		err = ops->init(sch, tca[TCA_OPTIONS], extack);
		if (err != 0)
			goto err_out5;
	}

	if (tca[TCA_STAB]) {
		stab = qdisc_get_stab(tca[TCA_STAB], extack);
		if (IS_ERR(stab)) {
			err = PTR_ERR(stab);
			goto err_out4;
		}
		rcu_assign_pointer(sch->stab, stab);
	}
	if (tca[TCA_RATE]) {
		seqcount_t *running;

		err = -EOPNOTSUPP;
		if (sch->flags & TCQ_F_MQROOT) {
			NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
			goto err_out4;
		}

		if (sch->parent != TC_H_ROOT &&
		    !(sch->flags & TCQ_F_INGRESS) &&
		    (!p || !(p->flags & TCQ_F_MQROOT)))
			running = qdisc_root_sleeping_running(sch);
		else
			running = &sch->running;

		err = gen_new_estimator(&sch->bstats,
					sch->cpu_bstats,
					&sch->rate_est,
					NULL,
					running,
					tca[TCA_RATE]);
		if (err) {
			NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
			goto err_out4;
		}
	}

	qdisc_hash_add(sch, false);

	return sch;

err_out5:
	/* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
	if (ops->destroy)
		ops->destroy(sch);
err_out3:
	dev_put(dev);
	qdisc_free(sch);
err_out2:
	module_put(ops->owner);
err_out:
	*errp = err;
	return NULL;

err_out4:
	/*
         * Any broken qdiscs that would require a ops->reset() here?
         * The qdisc was never in action so it shouldn't be necessary.
         */
	qdisc_put_stab(rtnl_dereference(sch->stab));
	if (ops->destroy)
		ops->destroy(sch);
	goto err_out3;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang49774.74%15.56%


Linus Torvalds (pre-git)629.32%211.11%


Alexander Aring527.82%527.78%


Jiri Pirko182.71%15.56%


Jussi Kivilinna162.41%15.56%


Eric Dumazet81.20%211.11%


John Fastabend40.60%15.56%


Patrick McHardy30.45%211.11%


Thomas Graf30.45%15.56%


David S. Miller10.15%15.56%


Daniel Borkmann10.15%15.56%


Total665100.00%18100.00%






static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
			struct netlink_ext_ack *extack)
{
	struct qdisc_size_table *ostab, *stab = NULL;
	int err = 0;

	if (tca[TCA_OPTIONS]) {
		if (!sch->ops->change) {
			NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc");
			return -EINVAL;
		}
		if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
			NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
			return -EOPNOTSUPP;
		}
		err = sch->ops->change(sch, tca[TCA_OPTIONS], extack);
		if (err)
			return err;
	}

	if (tca[TCA_STAB]) {
		stab = qdisc_get_stab(tca[TCA_STAB], extack);
		if (IS_ERR(stab))
			return PTR_ERR(stab);
	}

	ostab = rtnl_dereference(sch->stab);
	rcu_assign_pointer(sch->stab, stab);
	qdisc_put_stab(ostab);

	if (tca[TCA_RATE]) {
		/* NB: ignores errors from replace_estimator
                   because change can't be undone. */
		if (sch->flags & TCQ_F_MQROOT)
			goto out;
		gen_replace_estimator(&sch->bstats,
				      sch->cpu_bstats,
				      &sch->rate_est,
				      NULL,
				      qdisc_root_sleeping_running(sch),
				      tca[TCA_RATE]);
	}
out:
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang11750.87%17.69%


Linus Torvalds (pre-git)3816.52%215.38%


Jiri Pirko2510.87%17.69%


Alexander Aring198.26%323.08%


Patrick McHardy146.09%17.69%


Eric Dumazet83.48%215.38%


Eric W. Biedermann73.04%17.69%


Stéphane Graber10.43%17.69%


David Ahern10.43%17.69%


Total230100.00%13100.00%




struct check_loop_arg {
	
struct qdisc_walker	w;
	
struct Qdisc		*p;
	
int			depth;
};

static int check_loop_fn(struct Qdisc *q, unsigned long cl,
			 struct qdisc_walker *w);




static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
{
	struct check_loop_arg	arg;

	if (q->ops->cl_ops == NULL)
		return 0;

	arg.w.stop = arg.w.skip = arg.w.count = 0;
	arg.w.fn = check_loop_fn;
	arg.depth = depth;
	arg.p = p;
	q->ops->cl_ops->walk(q, &arg.w);
	return arg.w.stop ? -ELOOP : 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang8783.65%133.33%


Linus Torvalds (pre-git)1615.38%133.33%


Eric Dumazet10.96%133.33%


Total104100.00%3100.00%





static int

check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
{
	struct Qdisc *leaf;
	const struct Qdisc_class_ops *cops = q->ops->cl_ops;
	struct check_loop_arg *arg = (struct check_loop_arg *)w;

	leaf = cops->leaf(q, cl);
	if (leaf) {
		if (leaf == arg->p || arg->depth > 7)
			return -ELOOP;
		return check_loop(leaf, arg->p, arg->depth + 1);
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang7673.79%133.33%


Linus Torvalds (pre-git)2726.21%266.67%


Total103100.00%3100.00%



/*
 * Delete/get qdisc.
 */




static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
			struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	struct tcmsg *tcm = nlmsg_data(n);
	struct nlattr *tca[TCA_MAX + 1];
	struct net_device *dev;
	u32 clid;
	struct Qdisc *q = NULL;
	struct Qdisc *p = NULL;
	int err;

	if ((n->nlmsg_type != RTM_GETQDISC) &&
	    !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
		return -EPERM;

	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
	if (err < 0)
		return err;

	dev = __dev_get_by_index(net, tcm->tcm_ifindex);
	if (!dev)
		return -ENODEV;

	clid = tcm->tcm_parent;
	if (clid) {
		if (clid != TC_H_ROOT) {
			if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
				p = qdisc_lookup(dev, TC_H_MAJ(clid));
				if (!p) {
					NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid");
					return -ENOENT;
				}
				q = qdisc_leaf(p, clid);
			} else if (dev_ingress_queue(dev)) {
				q = dev_ingress_queue(dev)->qdisc_sleeping;
			}
		} else {
			q = dev->qdisc;
		}
		if (!q) {
			NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
			return -ENOENT;
		}

		if (tcm->tcm_handle && q->handle != tcm->tcm_handle) {
			NL_SET_ERR_MSG(extack, "Invalid handle");
			return -EINVAL;
		}
	} else {
		q = qdisc_lookup(dev, tcm->tcm_handle);
		if (!q) {
			NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle");
			return -ENOENT;
		}
	}

	if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
		NL_SET_ERR_MSG(extack, "Invalid qdisc name");
		return -EINVAL;
	}

	if (n->nlmsg_type == RTM_DELQDISC) {
		if (!clid) {
			NL_SET_ERR_MSG(extack, "Classid cannot be zero");
			return -EINVAL;
		}
		if (q->handle == 0) {
			NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero");
			return -ENOENT;
		}
		err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack);
		if (err != 0)
			return err;
	} else {
		qdisc_notify(net, skb, n, clid, NULL, q);
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)19742.27%520.00%


Américo Wang10622.75%14.00%


Alexander Aring6513.95%14.00%


Eric Dumazet214.51%28.00%


Hong Zhi Guo204.29%14.00%


Eric W. Biedermann143.00%312.00%


Denis V. Lunev91.93%14.00%


Patrick McHardy81.72%28.00%


David Ahern61.29%14.00%


David S. Miller61.29%28.00%


Stéphane Graber40.86%14.00%


Hideaki Yoshifuji / 吉藤英明30.64%14.00%


Jarek Poplawski30.64%14.00%


Catalin(ux aka Dino) M. Boie20.43%14.00%


Thomas Goff10.21%14.00%


Johannes Berg10.21%14.00%


Total466100.00%25100.00%



/*
 * Create/change qdisc.
 */




static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
			   struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	struct tcmsg *tcm;
	struct nlattr *tca[TCA_MAX + 1];
	struct net_device *dev;
	u32 clid;
	struct Qdisc *q, *p;
	int err;

	if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
		return -EPERM;

replay:
	/* Reinit, just in case something touches this. */
	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
	if (err < 0)
		return err;

	tcm = nlmsg_data(n);
	clid = tcm->tcm_parent;
	q = p = NULL;

	dev = __dev_get_by_index(net, tcm->tcm_ifindex);
	if (!dev)
		return -ENODEV;


	if (clid) {
		if (clid != TC_H_ROOT) {
			if (clid != TC_H_INGRESS) {
				p = qdisc_lookup(dev, TC_H_MAJ(clid));
				if (!p) {
					NL_SET_ERR_MSG(extack, "Failed to find specified qdisc");
					return -ENOENT;
				}
				q = qdisc_leaf(p, clid);
			} else if (dev_ingress_queue_create(dev)) {
				q = dev_ingress_queue(dev)->qdisc_sleeping;
			}
		} else {
			q = dev->qdisc;
		}

		/* It may be default qdisc, ignore it */
		if (q && q->handle == 0)
			q = NULL;

		if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
			if (tcm->tcm_handle) {
				if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) {
					NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override");
					return -EEXIST;
				}
				if (TC_H_MIN(tcm->tcm_handle)) {
					NL_SET_ERR_MSG(extack, "Invalid minor handle");
					return -EINVAL;
				}
				q = qdisc_lookup(dev, tcm->tcm_handle);
				if (!q)
					goto create_n_graft;
				if (n->nlmsg_flags & NLM_F_EXCL) {
					NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override");
					return -EEXIST;
				}
				if (tca[TCA_KIND] &&
				    nla_strcmp(tca[TCA_KIND], q->ops->id)) {
					NL_SET_ERR_MSG(extack, "Invalid qdisc name");
					return -EINVAL;
				}
				if (q == p ||
				    (p && check_loop(q, p, 0))) {
					NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected");
					return -ELOOP;
				}
				qdisc_refcount_inc(q);
				goto graft;
			} else {
				if (!q)
					goto create_n_graft;

				/* This magic test requires explanation.
                                 *
                                 *   We know, that some child q is already
                                 *   attached to this parent and have choice:
                                 *   either to change it or to create/graft new one.
                                 *
                                 *   1. We are allowed to create/graft only
                                 *   if CREATE and REPLACE flags are set.
                                 *
                                 *   2. If EXCL is set, requestor wanted to say,
                                 *   that qdisc tcm_handle is not expected
                                 *   to exist, so that we choose create/graft too.
                                 *
                                 *   3. The last case is when no flags are set.
                                 *   Alas, it is sort of hole in API, we
                                 *   cannot decide what to do unambiguously.
                                 *   For now we select create/graft, if
                                 *   user gave KIND, which does not match existing.
                                 */
				if ((n->nlmsg_flags & NLM_F_CREATE) &&
				    (n->nlmsg_flags & NLM_F_REPLACE) &&
				    ((n->nlmsg_flags & NLM_F_EXCL) ||
				     (tca[TCA_KIND] &&
				      nla_strcmp(tca[TCA_KIND], q->ops->id))))
					goto create_n_graft;
			}
		}
	} else {
		if (!tcm->tcm_handle) {
			NL_SET_ERR_MSG(extack, "Handle cannot be zero");
			return -EINVAL;
		}
		q = qdisc_lookup(dev, tcm->tcm_handle);
	}

	/* Change qdisc parameters */
	if (!q) {
		NL_SET_ERR_MSG(extack, "Specified qdisc not found");
		return -ENOENT;
	}
	if (n->nlmsg_flags & NLM_F_EXCL) {
		NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify");
		return -EEXIST;
	}
	if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
		NL_SET_ERR_MSG(extack, "Invalid qdisc name");
		return -EINVAL;
	}
	err = qdisc_change(q, tca, extack);
	if (err == 0)
		qdisc_notify(net, skb, n, clid, NULL, q);
	return err;

create_n_graft:
	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
		NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag");
		return -ENOENT;
	}
	if (clid == TC_H_INGRESS) {
		if (dev_ingress_queue(dev)) {
			q = qdisc_create(dev, dev_ingress_queue(dev), p,
					 tcm->tcm_parent, tcm->tcm_parent,
					 tca, &err, extack);
		} else {
			NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device");
			err = -ENOENT;
		}
	} else {
		struct netdev_queue *dev_queue;

		if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
			dev_queue = p->ops->cl_ops->select_queue(p, tcm);
		else if (p)
			dev_queue = p->dev_queue;
		else
			dev_queue = netdev_get_tx_queue(dev, 0);

		q = qdisc_create(dev, dev_queue, p,
				 tcm->tcm_parent, tcm->tcm_handle,
				 tca, &err, extack);
	}
	if (q == NULL) {
		if (err == -EAGAIN)
			goto replay;
		return err;
	}

graft:
	err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
	if (err) {
		if (q)
			qdisc_destroy(q);
		return err;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang57864.37%14.17%


Alexander Aring11913.25%28.33%


Linus Torvalds (pre-git)11713.03%312.50%


John Fastabend212.34%312.50%


Eric Dumazet212.34%312.50%


Thomas Graf192.12%28.33%


Jiri Kosina91.00%14.17%


Jussi Kivilinna40.45%14.17%


David S. Miller40.45%416.67%


Jamal Hadi Salim20.22%14.17%


Arnaldo Carvalho de Melo20.22%14.17%


Denis V. Lunev10.11%14.17%


Nicolas Dichtel10.11%14.17%


Total898100.00%24100.00%






static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
			      struct netlink_callback *cb,
			      int *q_idx_p, int s_q_idx, bool recur,
			      bool dump_invisible)
{
	int ret = 0, q_idx = *q_idx_p;
	struct Qdisc *q;
	int b;

	if (!root)
		return 0;

	q = root;
	if (q_idx < s_q_idx) {
		q_idx++;
	} else {
		if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
		    tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
				  cb->nlh->nlmsg_seq, NLM_F_MULTI,
				  RTM_NEWQDISC) <= 0)
			goto done;
		q_idx++;
	}

	/* If dumping singletons, there is no qdisc_dev(root) and the singleton
         * itself has already been dumped.
         *
         * If we've already dumped the top-level (ingress) qdisc above and the global
         * qdisc hashtable, we don't want to hit it again
         */
	if (!qdisc_dev(root) || !recur)
		goto out;

	hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
		if (q_idx < s_q_idx) {
			q_idx++;
			continue;
		}
		if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
		    tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
				  cb->nlh->nlmsg_seq, NLM_F_MULTI,
				  RTM_NEWQDISC) <= 0)
			goto done;
		q_idx++;
	}

out:
	*q_idx_p = q_idx;
	return ret;
done:
	ret = -1;
	goto out;
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller9139.06%16.67%


Linus Torvalds (pre-git)7733.05%320.00%


Jiri Kosina3414.59%426.67%


Patrick McHardy135.58%213.33%


Pavel Emelyanov62.58%16.67%


Denis V. Lunev62.58%16.67%


Eric W. Biedermann31.29%213.33%


Thomas Graf31.29%16.67%


Total233100.00%15100.00%






static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	int idx, q_idx;
	int s_idx, s_q_idx;
	struct net_device *dev;
	const struct nlmsghdr *nlh = cb->nlh;
	struct nlattr *tca[TCA_MAX + 1];
	int err;

	s_idx = cb->args[0];
	s_q_idx = q_idx = cb->args[1];

	idx = 0;
	ASSERT_RTNL();

	err = nlmsg_parse(nlh, sizeof(struct tcmsg), tca, TCA_MAX, NULL, NULL);
	if (err < 0)
		return err;

	for_each_netdev(net, dev) {
		struct netdev_queue *dev_queue;

		if (idx < s_idx)
			goto cont;
		if (idx > s_idx)
			s_q_idx = 0;
		q_idx = 0;

		if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx,
				       true, tca[TCA_DUMP_INVISIBLE]) < 0)
			goto done;

		dev_queue = dev_ingress_queue(dev);
		if (dev_queue &&
		    tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
				       &q_idx, s_q_idx, false,
				       tca[TCA_DUMP_INVISIBLE]) < 0)
			goto done;

cont:
		idx++;
	}

done:
	cb->args[0] = idx;
	cb->args[1] = q_idx;

	return skb->len;
}




Contributors
PersonTokensPropCommitsCommitProp
David S. Miller15660.47%218.18%


Jiri Kosina6324.42%218.18%


Linus Torvalds (pre-git)238.91%19.09%


Eric Dumazet93.49%218.18%


Johannes Berg20.78%19.09%


Colin Ian King20.78%19.09%


Patrick McHardy20.78%19.09%


Thomas Goff10.39%19.09%


Total258100.00%11100.00%



/************************************************
 *      Traffic classes manipulation.           *
 ************************************************/




static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
			  unsigned long cl,
			  u32 portid, u32 seq, u16 flags, int event)
{
	struct tcmsg *tcm;
	struct nlmsghdr  *nlh;
	unsigned char *b = skb_tail_pointer(skb);
	struct gnet_dump d;
	const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;

	cond_resched();
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
	if (!nlh)
		goto out_nlmsg_trim;
	tcm = nlmsg_data(nlh);
	tcm->tcm_family = AF_UNSPEC;
	tcm->tcm__pad1 = 0;
	tcm->tcm__pad2 = 0;
	tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
	tcm->tcm_parent = q->handle;
	tcm->tcm_handle = q->handle;
	tcm->tcm_info = 0;
	if (nla_put_string(skb, TCA_KIND, q->ops->id))
		goto nla_put_failure;
	if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
		goto nla_put_failure;

	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
					 NULL, &d, TCA_PAD) < 0)
		goto nla_put_failure;

	if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
		goto nla_put_failure;

	if (gnet_stats_finish_copy(&d) < 0)
		goto nla_put_failure;

	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
	return skb->len;

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


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang20369.52%111.11%


Linus Torvalds (pre-git)5418.49%111.11%


Hong Zhi Guo165.48%111.11%


Patrick McHardy124.11%111.11%


Eric W. Biedermann41.37%222.22%


Stéphane Graber10.34%111.11%


David Ahern10.34%111.11%


Eric Dumazet10.34%111.11%


Total292100.00%9100.00%






static int tclass_notify(struct net *net, struct sk_buff *oskb,
			 struct nlmsghdr *n, struct Qdisc *q,
			 unsigned long cl, int event)
{
	struct sk_buff *skb;
	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb)
		return -ENOBUFS;

	if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
		kfree_skb(skb);
		return -EINVAL;
	}

	return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
			      n->nlmsg_flags & NLM_F_ECHO);
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang9275.41%133.33%


Linus Torvalds (pre-git)2621.31%133.33%


Eric Dumazet43.28%133.33%


Total122100.00%3100.00%






static int tclass_del_notify(struct net *net,
			     const struct Qdisc_class_ops *cops,
			     struct sk_buff *oskb, struct nlmsghdr *n,
			     struct Qdisc *q, unsigned long cl)
{
	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
	struct sk_buff *skb;
	int err = 0;

	if (!cops->delete)
		return -EOPNOTSUPP;

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb)
		return -ENOBUFS;

	if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
			   RTM_DELTCLASS) < 0) {
		kfree_skb(skb);
		return -EINVAL;
	}

	err = cops->delete(q, cl);
	if (err) {
		kfree_skb(skb);
		return err;
	}

	return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
			      n->nlmsg_flags & NLM_F_ECHO);
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang166100.00%1100.00%


Total166100.00%1100.00%



#ifdef CONFIG_NET_CLS


struct tcf_bind_args {
	
struct tcf_walker w;
	
u32 classid;
	
unsigned long cl;
};




static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
{
	struct tcf_bind_args *a = (void *)arg;

	if (tp->ops->bind_class) {
		struct Qdisc *q = tcf_block_q(tp->chain->block);

		sch_tree_lock(q);
		tp->ops->bind_class(n, a->classid, a->cl);
		sch_tree_unlock(q);
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang6880.00%150.00%


Jiri Pirko1720.00%150.00%


Total85100.00%2100.00%






static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
			   unsigned long new_cl)
{
	const struct Qdisc_class_ops *cops = q->ops->cl_ops;
	struct tcf_block *block;
	struct tcf_chain *chain;
	unsigned long cl;

	cl = cops->find(q, portid);
	if (!cl)
		return;
	block = cops->tcf_block(q, cl, NULL);
	if (!block)
		return;
	list_for_each_entry(chain, &block->chain_list, list) {
		struct tcf_proto *tp;

		for (tp = rtnl_dereference(chain->filter_chain);
		     tp; tp = rtnl_dereference(tp->next)) {
			struct tcf_bind_args arg = {};

			arg.w.fn = tcf_node_bind;
			arg.classid = clid;
			arg.cl = new_cl;
			tp->ops->walk(tp, &arg.w);
		}
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang16098.77%150.00%


Alexander Aring21.23%150.00%


Total162100.00%2100.00%



#else




static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
			   unsigned long new_cl)
{
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang20100.00%1100.00%


Total20100.00%1100.00%



#endif




static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
			 struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	struct tcmsg *tcm = nlmsg_data(n);
	struct nlattr *tca[TCA_MAX + 1];
	struct net_device *dev;
	struct Qdisc *q = NULL;
	const struct Qdisc_class_ops *cops;
	unsigned long cl = 0;
	unsigned long new_cl;
	u32 portid;
	u32 clid;
	u32 qid;
	int err;

	if ((n->nlmsg_type != RTM_GETTCLASS) &&
	    !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
		return -EPERM;

	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
	if (err < 0)
		return err;

	dev = __dev_get_by_index(net, tcm->tcm_ifindex);
	if (!dev)
		return -ENODEV;

	/*
           parent == TC_H_UNSPEC - unspecified parent.
           parent == TC_H_ROOT   - class is root, which has no parent.
           parent == X:0         - parent is root class.
           parent == X:Y         - parent is a node in hierarchy.
           parent == 0:Y         - parent is X:Y, where X:0 is qdisc.

           handle == 0:0         - generate handle from kernel pool.
           handle == 0:Y         - class is X:Y, where X:0 is qdisc.
           handle == X:Y         - clear.
           handle == X:0         - root class.
         */

	/* Step 1. Determine qdisc handle X:0 */

	portid = tcm->tcm_parent;
	clid = tcm->tcm_handle;
	qid = TC_H_MAJ(clid);

	if (portid != TC_H_ROOT) {
		u32 qid1 = TC_H_MAJ(portid);

		if (qid && qid1) {
			/* If both majors are known, they must be identical. */
			if (qid != qid1)
				return -EINVAL;
		} else if (qid1) {
			qid = qid1;
		} else if (qid == 0)
			qid = dev->qdisc->handle;

		/* Now qid is genuine qdisc handle consistent
                 * both with parent and child.
                 *
                 * TC_H_MAJ(portid) still may be unspecified, complete it now.
                 */
		if (portid)
			portid = TC_H_MAKE(qid, portid);
	} else {
		if (qid == 0)
			qid = dev->qdisc->handle;
	}

	/* OK. Locate qdisc */
	q = qdisc_lookup(dev, qid);
	if (!q)
		return -ENOENT;

	/* An check that it supports classes */
	cops = q->ops->cl_ops;
	if (cops == NULL)
		return -EINVAL;

	/* Now try to get class */
	if (clid == 0) {
		if (portid == TC_H_ROOT)
			clid = qid;
	} else
		clid = TC_H_MAKE(qid, clid);

	if (clid)
		cl = cops->find(q, clid);

	if (cl == 0) {
		err = -ENOENT;
		if (n->nlmsg_type != RTM_NEWTCLASS ||
		    !(n->nlmsg_flags & NLM_F_CREATE))
			goto out;
	} else {
		switch (n->nlmsg_type) {
		case RTM_NEWTCLASS:
			err = -EEXIST;
			if (n->nlmsg_flags & NLM_F_EXCL)
				goto out;
			break;
		case RTM_DELTCLASS:
			err = tclass_del_notify(net, cops, skb, n, q, cl);
			/* Unbind the class with flilters with 0 */
			tc_bind_tclass(q, portid, clid, 0);
			goto out;
		case RTM_GETTCLASS:
			err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
			goto out;
		default:
			err = -EINVAL;
			goto out;
		}
	}

	if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
		NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes");
		return -EOPNOTSUPP;
	}

	new_cl = cl;
	err = -EOPNOTSUPP;
	if (cops->change)
		err = cops->change(q, clid, portid, tca, &new_cl, extack);
	if (err == 0) {
		tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
		/* We just create a new class, need to do reverse binding. */
		if (cl != new_cl)
			tc_bind_tclass(q, portid, clid, new_cl);
	}
out:
	return err;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang44473.88%421.05%


Linus Torvalds (pre-git)9916.47%15.26%


Jiri Pirko254.16%15.26%


Thomas Graf71.16%15.26%


David S. Miller71.16%315.79%


Arnaldo Carvalho de Melo40.67%15.26%


Eric Dumazet30.50%210.53%


Patrick McHardy30.50%15.26%


Eric W. Biedermann30.50%15.26%


Thomas Goff20.33%15.26%


Alexander Aring20.33%15.26%


Denis V. Lunev10.17%15.26%


Jamal Hadi Salim10.17%15.26%


Total601100.00%19100.00%




struct qdisc_dump_args {
	
struct qdisc_walker	w;
	
struct sk_buff		*skb;
	
struct netlink_callback	*cb;
};




static int qdisc_class_dump(struct Qdisc *q, unsigned long cl,
			    struct qdisc_walker *arg)
{
	struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;

	return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
			      a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
			      RTM_NEWTCLASS);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6698.51%150.00%


Eric W. Biedermann11.49%150.00%


Total67100.00%2100.00%






static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
				struct tcmsg *tcm, struct netlink_callback *cb,
				int *t_p, int s_t)
{
	struct qdisc_dump_args arg;

	if (tc_qdisc_dump_ignore(q, false) ||
	    *t_p < s_t || !q->ops->cl_ops ||
	    (tcm->tcm_parent &&
	     TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
		(*t_p)++;
		return 0;
	}
	if (*t_p > s_t)
		memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
	arg.w.fn = qdisc_class_dump;
	arg.skb = skb;
	arg.cb = cb;
	arg.w.stop  = 0;
	arg.w.skip = cb->args[1];
	arg.w.count = 0;
	q->ops->cl_ops->walk(q, &arg.w);
	cb->args[1] = arg.w.count;
	if (arg.w.stop)
		return -1;
	(*t_p)++;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)16172.52%233.33%


David S. Miller4721.17%116.67%


Patrick McHardy104.50%116.67%


Denis V. Lunev20.90%116.67%


Jiri Kosina20.90%116.67%


Total222100.00%6100.00%






static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
			       struct tcmsg *tcm, struct netlink_callback *cb,
			       int *t_p, int s_t)
{
	struct Qdisc *q;
	int b;

	if (!root)
		return 0;

	if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
		return -1;

	if (!qdisc_dev(root))
		return 0;

	if (tcm->tcm_parent) {
		q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
		if (q && tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
			return -1;
		return 0;
	}
	hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
		if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
			return -1;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller10058.48%120.00%


Eric Dumazet5029.24%120.00%


Jiri Kosina2011.70%240.00%


Linus Torvalds (pre-git)10.58%120.00%


Total171100.00%5100.00%






static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct tcmsg *tcm = nlmsg_data(cb->nlh);
	struct net *net = sock_net(skb->sk);
	struct netdev_queue *dev_queue;
	struct net_device *dev;
	int t, s_t;

	if (nlmsg_len(cb->nlh) < sizeof(*tcm))
		return 0;
	dev = dev_get_by_index(net, tcm->tcm_ifindex);
	if (!dev)
		return 0;

	s_t = cb->args[0];
	t = 0;

	if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
		goto done;

	dev_queue = dev_ingress_queue(dev);
	if (dev_queue &&
	    tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
				&t, s_t) < 0)
		goto done;

done:
	cb->args[0] = t;

	dev_put(dev);
	return skb->len;
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller14980.54%330.00%


Linus Torvalds (pre-git)2010.81%220.00%


Eric Dumazet105.41%220.00%


Hong Zhi Guo31.62%110.00%


Patrick McHardy21.08%110.00%


Thomas Goff10.54%110.00%


Total185100.00%10100.00%



#ifdef CONFIG_PROC_FS



static int psched_show(struct seq_file *seq, void *v)
{
	seq_printf(seq, "%08x %08x %08x %08x\n",
		   (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
		   1000000,
		   (u32)NSEC_PER_SEC / hrtimer_resolution);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2042.55%228.57%


Patrick McHardy1531.91%228.57%


Stephen Hemminger1021.28%114.29%


Jarek Poplawski12.13%114.29%


Thomas Gleixner12.13%114.29%


Total47100.00%7100.00%






static int psched_open(struct inode *inode, struct file *file)
{
	return single_open(file, psched_show, NULL);
}


Contributors
PersonTokensPropCommitsCommitProp
Stephen Hemminger2284.62%133.33%


Linus Torvalds (pre-git)311.54%133.33%


Thomas Goff13.85%133.33%


Total26100.00%3100.00%




static const struct file_operations psched_fops = {
	.open = psched_open,
	.read  = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};




static int __net_init psched_net_init(struct net *net)
{
	struct proc_dir_entry *e;

	e = proc_create("psched", 0, net->proc_net, &psched_fops);
	if (e == NULL)
		return -ENOMEM;

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Goff4189.13%150.00%


Gao Feng510.87%150.00%


Total46100.00%2100.00%






static void __net_exit psched_net_exit(struct net *net)
{
	remove_proc_entry("psched", net->proc_net);
}

Contributors
PersonTokensPropCommitsCommitProp
Thomas Goff1676.19%150.00%


Gao Feng523.81%150.00%


Total21100.00%2100.00%



#else



static int __net_init psched_net_init(struct net *net)
{
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Goff15100.00%1100.00%


Total15100.00%1100.00%






static void __net_exit psched_net_exit(struct net *net)
{
}

Contributors
PersonTokensPropCommitsCommitProp
Thomas Goff11100.00%1100.00%


Total11100.00%1100.00%



#endif


static struct pernet_operations psched_net_ops = {
	.init = psched_net_init,
	.exit = psched_net_exit,
};




static int __init pktsched_init(void)
{
	int err;

	err = register_pernet_subsys(&psched_net_ops);
	if (err) {
		pr_err("pktsched_init: "
		       "cannot initialize per netns operations\n");
		return err;
	}

	register_qdisc(&pfifo_fast_ops);
	register_qdisc(&pfifo_qdisc_ops);
	register_qdisc(&bfifo_qdisc_ops);
	register_qdisc(&pfifo_head_drop_qdisc_ops);
	register_qdisc(&mq_qdisc_ops);
	register_qdisc(&noqueue_qdisc_ops);

	rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0);
	rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0);
	rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc,
		      0);
	rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0);
	rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0);
	rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass,
		      0);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Graf5536.18%16.67%


Linus Torvalds (pre-git)3422.37%533.33%


Thomas Goff2516.45%16.67%


Florian Westphal63.95%16.67%


Stephen Hemminger63.95%16.67%


Greg Rose63.95%16.67%


Hagen Paul Pfeifer63.95%16.67%


David S. Miller63.95%16.67%


Phil Sutter63.95%16.67%


Eric Dumazet10.66%16.67%


Al Viro10.66%16.67%


Total152100.00%15100.00%



subsys_initcall(pktsched_init);

Overall Contributors
PersonTokensPropCommitsCommitProp
Américo Wang354334.61%74.00%


Linus Torvalds (pre-git)184818.05%105.71%


Patrick McHardy8368.17%2011.43%


David S. Miller7447.27%179.71%


Jussi Kivilinna6776.61%10.57%


Eric Dumazet3613.53%2212.57%


Alexander Aring3443.36%116.29%


Jiri Pirko3343.26%42.29%


Stephen Hemminger3073.00%42.29%


Jarek Poplawski2792.73%137.43%


Jiri Kosina1881.84%42.29%


Jesper Dangaard Brouer1791.75%21.14%


Thomas Goff1391.36%21.14%


Thomas Graf960.94%84.57%


John Fastabend880.86%74.00%


Hong Zhi Guo390.38%21.14%


Eric W. Biedermann350.34%52.86%


Arnaldo Carvalho de Melo260.25%31.71%


Konstantin Khlebnikov220.21%10.57%


Denis V. Lunev220.21%21.14%


Nogah Frankel220.21%10.57%


Gao Feng140.14%31.71%


Catalin(ux aka Dino) M. Boie110.11%10.57%


Florian Westphal80.08%31.71%


David Ahern80.08%10.57%


Pavel Emelyanov60.06%10.57%


Hagen Paul Pfeifer60.06%10.57%


Al Viro60.06%10.57%


Greg Rose60.06%10.57%


Phil Sutter60.06%10.57%


Stéphane Graber60.06%10.57%


Adrian Bunk50.05%31.71%


Thomas Gleixner50.05%21.14%


Johannes Berg40.04%10.57%


Hideaki Yoshifuji / 吉藤英明30.03%10.57%


Jamal Hadi Salim30.03%10.57%


Tejun Heo30.03%10.57%


Colin Ian King20.02%10.57%


Arjan van de Ven10.01%10.57%


Hannes Eder10.01%10.57%


Nicolas Dichtel10.01%10.57%


Daniel Borkmann10.01%10.57%


Zhi Yong Wu10.01%10.57%


Total10236100.00%175100.00%


Directory: net/sched



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