Release 4.8 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 <net/net_namespace.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>

static int qdisc_notify(struct net *net, struct sk_buff *oskb,
			struct nlmsghdr *n, u32 clid,
			struct Qdisc *old, struct Qdisc *new);
static int tclass_notify(struct net *net, struct sk_buff *oskb,
			 struct nlmsghdr *n, struct Qdisc *q,
			 unsigned long cl, int event);

/*

   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->get && cops->put && cops->walk && cops->leaf))
			goto out_einval;

		if (cops->tcf_chain && !(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;
}
Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 113 48.92% 2 33.33%
jarek poplawski jarek poplawski 101 43.72% 3 50.00%
arnaldo carvalho de melo arnaldo carvalho de melo 17 7.36% 1 16.67%
Total 231 100.00% 6 100.00%


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;
}
Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 93 100.00% 2 100.00%
Total 93 100.00% 2 100.00%


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);
}

Contributors
Person Tokens Prop Commits CommitProp
stephen hemminger stephen hemminger 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
stephen hemminger stephen hemminger 68 100.00% 1 100.00%
Total 68 100.00% 1 100.00%

/* 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;
}

Contributors
Person Tokens Prop Commits CommitProp
stephen hemminger stephen hemminger 107 100.00% 1 100.00%
Total 107 100.00% 1 100.00%

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

	list_for_each_entry_rcu(q, &root->list, list) {
		if (q->handle == handle)
			return q;
	}
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
david s. miller david s. miller 63 96.92% 1 33.33%
eric dumazet eric dumazet 1 1.54% 1 33.33%
hannes eder hannes eder 1 1.54% 1 33.33%
Total 65 100.00% 3 100.00%



void qdisc_list_add(struct Qdisc *q)
{
	if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
		struct Qdisc *root = qdisc_dev(q)->qdisc;

		WARN_ON_ONCE(root == &noop_qdisc);
		ASSERT_RTNL();
		list_add_tail_rcu(&q->list, &root->list);
	}
}
Contributors
Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 46 68.66% 3 60.00%
jarek poplawski jarek poplawski 20 29.85% 1 20.00%
patrick mchardy patrick mchardy 1 1.49% 1 20.00%
Total 67 100.00% 5 100.00%


EXPORT_SYMBOL(qdisc_list_add);



void qdisc_list_del(struct Qdisc *q)
{
	if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
		ASSERT_RTNL();
		list_del_rcu(&q->list);
	}
}
Contributors
Person Tokens Prop Commits CommitProp
jarek poplawski jarek poplawski 36 85.71% 1 50.00%
eric dumazet eric dumazet 6 14.29% 1 50.00%
Total 42 100.00% 2 100.00%


EXPORT_SYMBOL(qdisc_list_del);



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

	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;
}

Contributors
Person Tokens Prop Commits CommitProp
david s. miller david s. miller 16 25.00% 2 22.22%
jarek poplawski jarek poplawski 15 23.44% 2 22.22%
pre-git pre-git 15 23.44% 1 11.11%
eric dumazet eric dumazet 10 15.62% 1 11.11%
patrick mchardy patrick mchardy 8 12.50% 3 33.33%
Total 64 100.00% 9 100.00%



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->get(p, classid);

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

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 87 97.75% 2 50.00%
eric dumazet eric dumazet 1 1.12% 1 25.00%
adrian bunk adrian bunk 1 1.12% 1 25.00%
Total 89 100.00% 4 100.00%

/* 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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 68 78.16% 2 40.00%
patrick mchardy patrick mchardy 18 20.69% 2 40.00%
adrian bunk adrian bunk 1 1.15% 1 20.00%
Total 87 100.00% 5 100.00%

/* 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;
}

Contributors
Person Tokens Prop Commits CommitProp
jesper dangaard brouer jesper dangaard brouer 143 100.00% 1 100.00%
Total 143 100.00% 1 100.00%


static struct qdisc_rate_table *qdisc_rtab_list;



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

	if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
	    nla_len(tab) != TC_RTAB_SIZE)
		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;
	}
	return rtab;
}
Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 123 64.40% 1 25.00%
eric dumazet eric dumazet 45 23.56% 1 25.00%
jesper dangaard brouer jesper dangaard brouer 21 10.99% 1 25.00%
patrick mchardy patrick mchardy 2 1.05% 1 25.00%
Total 191 100.00% 4 100.00%


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;
		}
	}
}
Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 76 100.00% 1 100.00%
Total 76 100.00% 1 100.00%


EXPORT_SYMBOL(qdisc_put_rtab);

static LIST_HEAD(qdisc_stab_list);
static DEFINE_SPINLOCK(qdisc_stab_lock);


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 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);
	if (err < 0)
		return ERR_PTR(err);
	if (!tb[TCA_STAB_BASE])
		return ERR_PTR(-EINVAL);

	s = nla_data(tb[TCA_STAB_BASE]);

	if (s->tsize > 0) {
		if (!tb[TCA_STAB_DATA])
			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))
		return ERR_PTR(-EINVAL);

	spin_lock(&qdisc_stab_lock);

	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++;
		spin_unlock(&qdisc_stab_lock);
		return stab;
	}

	spin_unlock(&qdisc_stab_lock);

	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));

	spin_lock(&qdisc_stab_lock);
	list_add_tail(&stab->list, &qdisc_stab_list);
	spin_unlock(&qdisc_stab_lock);

	return stab;
}

Contributors
Person Tokens Prop Commits CommitProp
jussi kivilinna jussi kivilinna 338 98.54% 1 50.00%
david s. miller david s. miller 5 1.46% 1 50.00%
Total 343 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



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

	spin_lock(&qdisc_stab_lock);

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

	spin_unlock(&qdisc_stab_lock);
}
Contributors
Person Tokens Prop Commits CommitProp
jussi kivilinna jussi kivilinna 49 85.96% 1 33.33%
eric dumazet eric dumazet 6 10.53% 1 33.33%
david s. miller david s. miller 2 3.51% 1 33.33%
Total 57 100.00% 3 100.00%


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;
}

Contributors
Person Tokens Prop Commits CommitProp
jussi kivilinna jussi kivilinna 65 80.25% 1 33.33%
patrick mchardy patrick mchardy 9 11.11% 1 33.33%
david s. miller david s. miller 7 8.64% 1 33.33%
Total 81 100.00% 3 100.00%



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;
}
Contributors
Person Tokens Prop Commits CommitProp
jussi kivilinna jussi kivilinna 170 98.84% 1 50.00%
eric dumazet eric dumazet 2 1.16% 1 50.00%
Total 172 100.00% 2 100.00%


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;
	}
}
Contributors
Person Tokens Prop Commits CommitProp
jarek poplawski jarek poplawski 51 96.23% 1 33.33%
florian westphal florian westphal 1 1.89% 1 33.33%
eric dumazet eric dumazet 1 1.89% 1 33.33%
Total 53 100.00% 3 100.00%


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;
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 32 69.57% 1 20.00%
david s. miller david s. miller 7 15.22% 2 40.00%
john fastabend john fastabend 6 13.04% 1 20.00%
stephen hemminger stephen hemminger 1 2.17% 1 20.00%
Total 46 100.00% 5 100.00%



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;
}
Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 31 75.61% 1 33.33%
david s. miller david s. miller 9 21.95% 1 33.33%
eric dumazet eric dumazet 1 2.44% 1 33.33%
Total 41 100.00% 3 100.00%


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);
}
Contributors
Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 22 36.07% 4 57.14%
patrick mchardy patrick mchardy 19 31.15% 1 14.29%
jarek poplawski jarek poplawski 18 29.51% 1 14.29%
jiri pirko jiri pirko 2 3.28% 1 14.29%
Total 61 100.00% 7 100.00%


EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);



void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
{
	hrtimer_cancel(&wd->timer);
}
Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 17 94.44% 1 50.00%
david s. miller david s. miller 1 5.56% 1 50.00%
Total 18 100.00% 2 100.00%


EXPORT_SYMBOL(qdisc_watchdog_cancel);



static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
{
	unsigned int size = n * sizeof(struct hlist_head), i;
	struct hlist_head *h;

	if (size <= PAGE_SIZE)
		h = kmalloc(size, GFP_KERNEL);
	else
		h = (struct hlist_head *)
			__get_free_pages(GFP_KERNEL, get_order(size));

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

Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 96 98.97% 1 50.00%
adrian bunk adrian bunk 1 1.03% 1 50.00%
Total 97 100.00% 2 100.00%



static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
{
	unsigned int size = n * sizeof(struct hlist_head);

	if (size <= PAGE_SIZE)
		kfree(h);
	else
		free_pages((unsigned long)h, get_order(size));
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 53 100.00% 1 100.00%
Total 53 100.00% 1 100.00%



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);

	qdisc_class_hash_free(ohash, osize);
}
Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 190 100.00% 1 100.00%
Total 190 100.00% 1 100.00%


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 == NULL)
		return -ENOMEM;
	clhash->hashsize  = size;
	clhash->hashmask  = size - 1;
	clhash->hashelems = 0;
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 60 100.00% 1 100.00%
Total 60 100.00% 1 100.00%


EXPORT_SYMBOL(qdisc_class_hash_init);



void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
{
	qdisc_class_hash_free(clhash->hash, clhash->hashsize);
}
Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%


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
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 61 100.00% 1 100.00%
Total 61 100.00% 1 100.00%


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
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%


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
Person Tokens Prop Commits CommitProp
pre-git pre-git 72 83.72% 2 50.00%
eric dumazet eric dumazet 13 15.12% 1 25.00%
adrian bunk adrian bunk 1 1.16% 1 25.00%
Total 86 100.00% 4 100.00%



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;
	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;
		/* 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 (cops->qlen_notify) {
			cl = cops->get(sch, parentid);
			cops->qlen_notify(sch, cl);
			cops->put(sch, cl);
		}
		sch->q.qlen -= n;
		sch->qstats.backlog -= len;
		__qdisc_qstats_drop(sch, drops);
	}
	rcu_read_unlock();
}
Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 123 62.76% 3 30.00%
eric dumazet eric dumazet 37 18.88% 3 30.00%
americo wang americo wang 17 8.67% 1 10.00%
jarek poplawski jarek poplawski 12 6.12% 1 10.00%
john fastabend john fastabend 4 2.04% 1 10.00%
david s. miller david s. miller 3 1.53% 1 10.00%
Total 196 100.00% 10 100.00%


EXPORT_SYMBOL(qdisc_tree_reduce_backlog);



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
Person Tokens Prop Commits CommitProp
david s. miller david s. miller 57 89.06% 1 50.00%
thomas goff thomas goff 7 10.94% 1 50.00%
Total 64 100.00% 2 100.00%

/* 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 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))
				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)
				atomic_inc(&new->refcnt);

			if (!ingress)
				qdisc_destroy(old);
		}

skip:
		if (!ingress) {
			notify_and_destroy(net, skb, n, classid,
					   dev->qdisc, new);
			if (new && !new->ops->attach)
				atomic_inc(&new->refcnt);
			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;

		err = -EOPNOTSUPP;
		if (cops && cops->graft) {
			unsigned long cl = cops->get(parent, classid);
			if (cl) {
				err = cops->graft(parent, cl, new, &old);
				cops->put(parent, cl);
			} else
				err = -ENOENT;
		}
		if (!err)
			notify_and_destroy(net, skb, n, classid, old, new);
	}
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
david s. miller david s. miller 180 41.00% 3 18.75%
pre-git pre-git 131 29.84% 4 25.00%
patrick mchardy patrick mchardy 42 9.57% 2 12.50%
jarek poplawski jarek poplawski 28 6.38% 1 6.25%
americo wang americo wang 24 5.47% 1 6.25%
eric dumazet eric dumazet 16 3.64% 2 12.50%
thomas goff thomas goff 16 3.64% 1 6.25%
thomas graf thomas graf 1 0.23% 1 6.25%
adrian bunk adrian bunk 1 0.23% 1 6.25%
Total 439 100.00% 16 100.00%

/* 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)
{
	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 == NULL)
		goto err_out;

	sch = qdisc_alloc(dev_queue, ops);
	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;

	if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
		if (qdisc_is_percpu_stats(sch)) {
			sch->cpu_bstats =
				netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
			if (!sch->cpu_bstats)
				goto err_out4;

			sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
			if (!sch->cpu_qstats)
				goto err_out4;
		}

		if (tca[TCA_STAB]) {
			stab = qdisc_get_stab(tca[TCA_STAB]);
			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)
				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)
				goto err_out4;
		}

		qdisc_list_add(sch);

		return sch;
	}
err_out3:
	dev_put(dev);
	kfree((char *) sch - sch->padded);
err_out2:
	module_put(ops->owner);
err_out:
	*errp = err;
	return NULL;

err_out4:
	free_percpu(sch->cpu_bstats);
	free_percpu(sch->cpu_qstats);
	/*
         * 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
Person Tokens Prop Commits CommitProp
pre-git pre-git 222 35.41% 4 11.76%
patrick mchardy patrick mchardy 95 15.15% 8 23.53%
john fastabend john fastabend 66 10.53% 2 5.88%
jarek poplawski jarek poplawski 61 9.73% 4 11.76%
thomas graf thomas graf 53 8.45% 4 11.76%
jussi kivilinna jussi kivilinna 47 7.50% 1 2.94%
catalin boie catalin boie 32 5.10% 1 2.94%
eric dumazet eric dumazet 32 5.10% 3 8.82%
david s. miller david s. miller 15 2.39% 3 8.82%
linus torvalds linus torvalds 1 0.16% 1 2.94%
sabrina dubroca sabrina dubroca 1 0.16% 1 2.94%
jamal hadi salim jamal hadi salim 1 0.16% 1 2.94%
johannes berg johannes berg 1 0.16% 1 2.94%
Total 627 100.00% 34 100.00%



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

	if (tca[TCA_OPTIONS]) {
		if (sch->ops->change == NULL)
			return -EINVAL;
		err = sch->ops->change(sch, tca[TCA_OPTIONS]);
		if (err)
			return err;
	}

	if (tca[TCA_STAB]) {
		stab = qdisc_get_stab(tca[TCA_STAB]);
		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
Person Tokens Prop Commits CommitProp
pre-git pre-git 86 45.74% 2 16.67%
jussi kivilinna jussi kivilinna 55 29.26% 1 8.33%
eric dumazet eric dumazet 18 9.57% 2 16.67%
patrick mchardy patrick mchardy 16 8.51% 2 16.67%
david s. miller david s. miller 4 2.13% 2 16.67%
john fastabend john fastabend 4 2.13% 1 8.33%
thomas graf thomas graf 4 2.13% 1 8.33%
stephen hemminger stephen hemminger 1 0.53% 1 8.33%
Total 188 100.00% 12 100.00%


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
Person Tokens Prop Commits CommitProp
pre-git pre-git 104 100.00% 1 100.00%
Total 104 100.00% 1 100.00%


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
Person Tokens Prop Commits CommitProp
pre-git pre-git 102 99.03% 2 66.67%
eric dumazet eric dumazet 1 0.97% 1 33.33%
Total 103 100.00% 3 100.00%

/*
 * Delete/get qdisc.
 */



static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
{
	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);
	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)
					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)
			return -ENOENT;

		if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
			return -EINVAL;
	} else {
		q = qdisc_lookup(dev, tcm->tcm_handle);
		if (!q)
			return -ENOENT;
	}

	if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
		return -EINVAL;

	if (n->nlmsg_type == RTM_DELQDISC) {
		if (!clid)
			return -EINVAL;
		if (q->handle == 0)
			return -ENOENT;
		err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
		if (err != 0)
			return err;
	} else {
		qdisc_notify(net, skb, n, clid, NULL, q);
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 259 65.74% 3 16.67%
patrick mchardy patrick mchardy 37 9.39% 2 11.11%
eric dumazet eric dumazet 26 6.60% 2 11.11%
hong zhi guo hong zhi guo 26 6.60% 1 5.56%
eric w. biederman eric w. biederman 21 5.33% 2 11.11%
denis v. lunev denis v. lunev 9 2.28% 1 5.56%
david s. miller david s. miller 7 1.78% 4 22.22%
stephane graber stephane graber 4 1.02% 1 5.56%
hideaki yoshifuji hideaki yoshifuji 3 0.76% 1 5.56%
thomas goff thomas goff 2 0.51% 1 5.56%
Total 394 100.00% 18 100.00%

/*
 * Create/change qdisc.
 */



static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
{
	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);
	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)
					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))
					return -EEXIST;
				if (TC_H_MIN(tcm->tcm_handle))
					return -EINVAL;
				q = qdisc_lookup(dev, tcm->tcm_handle);
				if (!q)
					goto create_n_graft;
				if (n->nlmsg_flags & NLM_F_EXCL)
					return -EEXIST;
				if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
					return -EINVAL;
				if (q == p ||
				    (p && check_loop(q, p, 0)))
					return -ELOOP;
				atomic_inc(&q->refcnt);
				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)
			return -EINVAL;
		q = qdisc_lookup(dev, tcm->tcm_handle);
	}

	/* Change qdisc parameters */
	if (q == NULL)
		return -ENOENT;
	if (n->nlmsg_flags & NLM_F_EXCL)
		return -EEXIST;
	if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
		return -EINVAL;
	err = qdisc_change(q, tca);
	if (err == 0)
		qdisc_notify(net, skb, n, clid, NULL, q);
	return err;

create_n_graft:
	if (!(n->nlmsg_flags & NLM_F_CREATE))
		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);
		else
			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);
	}
	if (q == NULL) {
		if (err == -EAGAIN)
			goto replay;
		return err;
	}

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

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 538 69.24% 5 17.86%
david s. miller david s. miller 49 6.31% 7 25.00%
eric dumazet eric dumazet 46 5.92% 2 7.14%
catalin boie catalin boie 34 4.38% 1 3.57%
hong zhi guo hong zhi guo 28 3.60% 1 3.57%
jarek poplawski jarek poplawski 26 3.35% 1 3.57%
patrick mchardy patrick mchardy 23 2.96% 4 14.29%
eric w. biederman eric w. biederman 14 1.80% 3 10.71%
denis v. lunev denis v. lunev 9 1.16% 1 3.57%
stephane graber stephane graber 4 0.51% 1 3.57%
hideaki yoshifuji hideaki yoshifuji 3 0.39% 1 3.57%
thomas goff thomas goff 3 0.39% 1 3.57%
Total 777 100.00% 28 100.00%



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 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 = atomic_read(&q->refcnt);
	if (nla_put_string(skb, TCA_KIND, q->ops->id))
		goto nla_put_failure;
	if (q->ops->dump && q->ops->dump(q, skb) < 0)
		goto nla_put_failure;
	qlen = q->q.qlen;

	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->bstats, &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
Person Tokens Prop Commits CommitProp
pre-git pre-git 191 45.15% 4 16.00%
thomas graf thomas graf 84 19.86% 2 8.00%
john fastabend john fastabend 46 10.87% 3 12.00%
eric dumazet eric dumazet 28 6.62% 4 16.00%
david s. miller david s. miller 25 5.91% 4 16.00%
patrick mchardy patrick mchardy 18 4.26% 2 8.00%
jussi kivilinna jussi kivilinna 17 4.02% 1 4.00%
arnaldo carvalho de melo arnaldo carvalho de melo 7 1.65% 2 8.00%
jamal hadi salim jamal hadi salim 3 0.71% 1 4.00%
eric w. biederman eric w. biederman 2 0.47% 1 4.00%
nicolas dichtel nicolas dichtel 2 0.47% 1 4.00%
Total 423 100.00% 25 100.00%



static bool tc_qdisc_dump_ignore(struct Qdisc *q)
{
	return (q->flags & TCQ_F_BUILTIN) ? true : false;
}

Contributors
Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



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)) {
		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)) {
		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
Person Tokens Prop Commits CommitProp
pre-git pre-git 163 87.63% 3 37.50%
eric dumazet eric dumazet 10 5.38% 1 12.50%
thomas goff thomas goff 6 3.23% 1 12.50%
eric w. biederman eric w. biederman 5 2.69% 1 12.50%
patrick mchardy patrick mchardy 1 0.54% 1 12.50%
denis v. lunev denis v. lunev 1 0.54% 1 12.50%
Total 186 100.00% 8 100.00%



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)
{
	int ret = 0, q_idx = *q_idx_p;
	struct Qdisc *q;

	if (!root)
		return 0;

	q = root;
	if (q_idx < s_q_idx) {
		q_idx++;
	} else {
		if (!tc_qdisc_dump_ignore(q) &&
		    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++;
	}
	list_for_each_entry(q, &root->list, list) {
		if (q_idx < s_q_idx) {
			q_idx++;
			continue;
		}
		if (!tc_qdisc_dump_ignore(q) &&
		    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
Person Tokens Prop Commits CommitProp
david s. miller david s. miller 92 45.32% 1 9.09%
pre-git pre-git 77 37.93% 3 27.27%
patrick mchardy patrick mchardy 16 7.88% 2 18.18%
denis v. lunev denis v. lunev 6 2.96% 1 9.09%
pavel emelianov pavel emelianov 6 2.96% 1 9.09%
eric w. biederman eric w. biederman 3 1.48% 2 18.18%
thomas graf thomas graf 3 1.48% 1 9.09%
Total 203 100.00% 11 100.00%



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;

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

	idx = 0;
	ASSERT_RTNL();
	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) < 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) < 0)
			goto done;

cont:
		idx++;
	}

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

	return skb->len;
}



Contributors
Person Tokens Prop Commits CommitProp
david s. miller david s. miller 157 82.20% 2 28.57%
pre-git pre-git 22 11.52% 1 14.29%
eric dumazet eric dumazet 9 4.71% 2 28.57%
patrick mchardy patrick mchardy 2 1.05% 1 14.29%
thomas goff thomas goff 1 0.52% 1 14.29%
Total 191 100.00% 7 100.00%

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





static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
{
	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);
	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->get(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 = -EOPNOTSUPP;
			if (cops->delete)
				err = cops->delete(q, cl);
			if (err == 0)
				tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
			goto out;
		case RTM_GETTCLASS:
			err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
			goto out;
		default:
			err = -EINVAL;
			goto out;
		}
	}

	new_cl = cl;
	err = -EOPNOTSUPP;
	if (cops->change)
		err = cops->change(q, clid, portid, tca, &new_cl);
	if (err == 0)
		tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);

out:
	if (cl)
		cops->put(q, cl);

	return err;
}


Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 415 72.30% 2 11.76%
patrick mchardy patrick mchardy 60 10.45% 3 17.65%
hong zhi guo hong zhi guo 39 6.79% 1 5.88%
eric w. biederman eric w. biederman 30 5.23% 3 17.65%
denis v. lunev denis v. lunev 9 1.57% 1 5.88%
thomas goff thomas goff 6 1.05% 1 5.88%
eric dumazet eric dumazet 6 1.05% 2 11.76%
stephane graber stephane graber 4 0.70% 1 5.88%
hideaki yoshifuji hideaki yoshifuji 3 0.52% 1 5.88%
david s. miller david s. miller 2 0.35% 2 11.76%
Total 574 100.00% 17 100.00%



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
Person Tokens Prop Commits CommitProp
pre-git pre-git 165 56.51% 2 12.50%
thomas graf thomas graf 70 23.97% 1 6.25%
david s. miller david s. miller 21 7.19% 3 18.75%
eric dumazet eric dumazet 17 5.82% 4 25.00%
arnaldo carvalho de melo arnaldo carvalho de melo 7 2.40% 2 12.50%
patrick mchardy patrick mchardy 5 1.71% 1 6.25%
jamal hadi salim jamal hadi salim 3 1.03% 1 6.25%
nicolas dichtel nicolas dichtel 2 0.68% 1 6.25%
eric w. biederman eric w. biederman 2 0.68% 1 6.25%
Total 292 100.00% 16 100.00%



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
Person Tokens Prop Commits CommitProp
pre-git pre-git 110 90.16% 2 33.33%
thomas goff thomas goff 6 4.92% 1 16.67%
eric w. biederman eric w. biederman 4 3.28% 1 16.67%
denis v. lunev denis v. lunev 1 0.82% 1 16.67%
patrick mchardy patrick mchardy 1 0.82% 1 16.67%
Total 122 100.00% 6 100.00%


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
Person Tokens Prop Commits CommitProp
pre-git pre-git 66 98.51% 1 50.00%
eric w. biederman eric w. biederman 1 1.49% 1 50.00%
Total 67 100.00% 2 100.00%



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) ||
	    *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
Person Tokens Prop Commits CommitProp
pre-git pre-git 161 73.18% 2 40.00%
david s. miller david s. miller 47 21.36% 1 20.00%
patrick mchardy patrick mchardy 10 4.55% 1 20.00%
denis v. lunev denis v. lunev 2 0.91% 1 20.00%
Total 220 100.00% 5 100.00%



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;

	if (!root)
		return 0;

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

	list_for_each_entry(q, &root->list, list) {
		if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
			return -1;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
david s. miller david s. miller 104 99.05% 1 50.00%
pre-git pre-git 1 0.95% 1 50.00%
Total 105 100.00% 2 100.00%



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
Person Tokens Prop Commits CommitProp
david s. miller david s. miller 149 80.54% 3 30.00%
pre-git pre-git 20 10.81% 2 20.00%
eric dumazet eric dumazet 10 5.41% 2 20.00%
hong zhi guo hong zhi guo 3 1.62% 1 10.00%
patrick mchardy patrick mchardy 2 1.08% 1 10.00%
thomas goff thomas goff 1 0.54% 1 10.00%
Total 185 100.00% 10 100.00%

/* Main classifier routine: scans classifier chain attached
 * to this qdisc, (optionally) tests for protocol and asks
 * specific classifiers.
 */


int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
		struct tcf_result *res, bool compat_mode)
{
	__be16 protocol = tc_skb_protocol(skb);
#ifdef CONFIG_NET_CLS_ACT
	const struct tcf_proto *old_tp = tp;
	int limit = 0;

reclassify:
#endif
	for (; tp; tp = rcu_dereference_bh(tp->next)) {
		int err;

		if (tp->protocol != protocol &&
		    tp->protocol != htons(ETH_P_ALL))
			continue;

		err = tp->classify(skb, tp, res);
#ifdef CONFIG_NET_CLS_ACT
		if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode))
			goto reset;
#endif
		if (err >= 0)
			return err;
	}

	return TC_ACT_UNSPEC; /* signal: continue lookup */
#ifdef CONFIG_NET_CLS_ACT
reset:
	if (unlikely(limit++ >= MAX_REC_LOOP)) {
		net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n",
				       tp->q->ops->id, tp->prio & 0xffff,
				       ntohs(tp->protocol));
		return TC_ACT_SHOT;
	}

	tp = old_tp;
	protocol = tc_skb_protocol(skb);
	goto reclassify;
#endif
}
Contributors
Person Tokens Prop Commits CommitProp
thomas graf thomas graf 93 47.21% 1 6.67%
daniel borkmann daniel borkmann 51 25.89% 2 13.33%
patrick mchardy patrick mchardy 13 6.60% 1 6.67%
eric dumazet eric dumazet 10 5.08% 2 13.33%
jamal hadi salim jamal hadi salim 9 4.57% 2 13.33%
stephen hemminger stephen hemminger 8 4.06% 1 6.67%
florian westphal florian westphal 4 2.03% 1 6.67%
john fastabend john fastabend 3 1.52% 1 6.67%
jiri pirko jiri pirko 3 1.52% 1 6.67%
joe perches joe perches 1 0.51% 1 6.67%
al viro al viro 1 0.51% 1 6.67%
hideaki yoshifuji hideaki yoshifuji 1 0.51% 1 6.67%
Total 197 100.00% 15 100.00%


EXPORT_SYMBOL(tc_classify);



bool tcf_destroy(struct tcf_proto *tp, bool force)
{
	if (tp->ops->destroy(tp, force)) {
		module_put(tp->ops->owner);
		kfree_rcu(tp, rcu);
		return true;
	}

	return false;
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 30 60.00% 1 33.33%
cong wang cong wang 17 34.00% 1 33.33%
john fastabend john fastabend 3 6.00% 1 33.33%
Total 50 100.00% 3 100.00%



void tcf_destroy_chain(struct tcf_proto __rcu **fl)
{
	struct tcf_proto *tp;

	while ((tp = rtnl_dereference(*fl)) != NULL) {
		RCU_INIT_POINTER(*fl, tp->next);
		tcf_destroy(tp, true);
	}
}
Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 40 80.00% 2 50.00%
john fastabend john fastabend 8 16.00% 1 25.00%
cong wang cong wang 2 4.00% 1 25.00%
Total 50 100.00% 4 100.00%


EXPORT_SYMBOL(tcf_destroy_chain);

#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
Person Tokens Prop Commits CommitProp
pre-git pre-git 20 42.55% 2 28.57%
patrick mchardy patrick mchardy 15 31.91% 2 28.57%
stephen hemminger stephen hemminger 10 21.28% 1 14.29%
jarek poplawski jarek poplawski 1 2.13% 1 14.29%
thomas gleixner thomas gleixner 1 2.13% 1 14.29%
Total 47 100.00% 7 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
stephen hemminger stephen hemminger 22 84.62% 1 33.33%
pre-git pre-git 3 11.54% 1 33.33%
thomas goff thomas goff 1 3.85% 1 33.33%
Total 26 100.00% 3 100.00%


static const struct file_operations psched_fops = {
	.owner = THIS_MODULE,
	.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
Person Tokens Prop Commits CommitProp
thomas goff thomas goff 41 89.13% 1 50.00%
gao feng gao feng 5 10.87% 1 50.00%
Total 46 100.00% 2 100.00%



static void __net_exit psched_net_exit(struct net *net)
{
	remove_proc_entry("psched", net->proc_net);
}
Contributors
Person Tokens Prop Commits CommitProp
thomas goff thomas goff 16 76.19% 1 50.00%
gao feng gao feng 5 23.81% 1 50.00%
Total 21 100.00% 2 100.00%

#else


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

Contributors
Person Tokens Prop Commits CommitProp
thomas goff thomas goff 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%



static void __net_exit psched_net_exit(struct net *net)
{
}
Contributors
Person Tokens Prop Commits CommitProp
thomas goff thomas goff 11 100.00% 1 100.00%
Total 11 100.00% 1 100.00%

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

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
thomas graf thomas graf 55 36.18% 1 7.14%
pre-git pre-git 34 22.37% 5 35.71%
thomas goff thomas goff 25 16.45% 1 7.14%
greg rose greg rose 12 7.89% 1 7.14%
hagen paul pfeifer hagen paul pfeifer 6 3.95% 1 7.14%
phil sutter phil sutter 6 3.95% 1 7.14%
david s. miller david s. miller 6 3.95% 1 7.14%
stephen hemminger stephen hemminger 6 3.95% 1 7.14%
eric dumazet eric dumazet 1 0.66% 1 7.14%
al viro al viro 1 0.66% 1 7.14%
Total 152 100.00% 14 100.00%


subsys_initcall(pktsched_init);
Overall Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 3701 39.44% 10 5.92%
patrick mchardy patrick mchardy 1274 13.58% 26 15.38%
david s. miller david s. miller 1032 11.00% 20 11.83%
jussi kivilinna jussi kivilinna 801 8.54% 1 0.59%
eric dumazet eric dumazet 479 5.10% 23 13.61%
jarek poplawski jarek poplawski 393 4.19% 14 8.28%
thomas graf thomas graf 363 3.87% 10 5.92%
stephen hemminger stephen hemminger 295 3.14% 5 2.96%
thomas goff thomas goff 186 1.98% 2 1.18%
jesper dangaard brouer jesper dangaard brouer 165 1.76% 1 0.59%
john fastabend john fastabend 140 1.49% 6 3.55%
hong zhi guo hong zhi guo 96 1.02% 2 1.18%
eric w. biederman eric w. biederman 85 0.91% 5 2.96%
catalin boie catalin boie 66 0.70% 1 0.59%
daniel borkmann daniel borkmann 51 0.54% 2 1.18%
americo wang americo wang 42 0.45% 2 1.18%
denis v. lunev denis v. lunev 40 0.43% 2 1.18%
arnaldo carvalho de melo arnaldo carvalho de melo 34 0.36% 3 1.78%
cong wang cong wang 19 0.20% 1 0.59%
jamal hadi salim jamal hadi salim 16 0.17% 4 2.37%
greg rose greg rose 12 0.13% 1 0.59%
stephane graber stephane graber 12 0.13% 1 0.59%
gao feng gao feng 10 0.11% 2 1.18%
hideaki yoshifuji hideaki yoshifuji 10 0.11% 2 1.18%
al viro al viro 7 0.07% 2 1.18%
florian westphal florian westphal 6 0.06% 3 1.78%
jiri pirko jiri pirko 6 0.06% 2 1.18%
hagen paul pfeifer hagen paul pfeifer 6 0.06% 1 0.59%
pavel emelianov pavel emelianov 6 0.06% 1 0.59%
phil sutter phil sutter 6 0.06% 1 0.59%
thomas gleixner thomas gleixner 5 0.05% 2 1.18%
adrian bunk adrian bunk 5 0.05% 2 1.18%
nicolas dichtel nicolas dichtel 4 0.04% 1 0.59%
tejun heo tejun heo 3 0.03% 1 0.59%
joe perches joe perches 1 0.01% 1 0.59%
johannes berg johannes berg 1 0.01% 1 0.59%
hannes eder hannes eder 1 0.01% 1 0.59%
zhi yong wu zhi yong wu 1 0.01% 1 0.59%
sabrina dubroca sabrina dubroca 1 0.01% 1 0.59%
linus torvalds linus torvalds 1 0.01% 1 0.59%
arjan van de ven arjan van de ven 1 0.01% 1 0.59%
Total 9383 100.00% 169 100.00%
  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	113	48.92%	2	33.33%
jarek poplawski	jarek poplawski	101	43.72%	3	50.00%
arnaldo carvalho de melo	arnaldo carvalho de melo	17	7.36%	1	16.67%
	Total	231	100.00%	6	100.00%
cregit-Linux how code gets into the kernel

Release 4.8 net/sched/sch_api.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
