Release 4.11 net/sched/sch_dsmark.c

/* net/sched/sch_dsmark.c - Differentiated Services field marker */

/* Written 1998-2000 by Werner Almesberger, EPFL ICA */


#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/bitops.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <asm/byteorder.h>

/*
 * classid      class           marking
 * -------      -----           -------
 *   n/a          0             n/a
 *   x:0          1             use entry [0]
 *   ...         ...            ...
 *   x:y y>0     y+1            use entry [y]
 *   ...         ...            ...
 * x:indices-1  indices         use entry [indices-1]
 *   ...         ...            ...
 *   x:y         y+1            use entry [y & (indices-1)]
 *   ...         ...            ...
 * 0xffff       0x10000         use entry [indices-1]
 */



#define NO_DEFAULT_INDEX	(1 << 16)


struct mask_value {
	
u8			mask;
	
u8			value;
};


struct dsmark_qdisc_data {
	
struct Qdisc		*q;
	
struct tcf_proto __rcu	*filter_list;
	
struct mask_value	*mv;
	
u16			indices;
	
u8			set_tc_index;
	
u32			default_index;	/* index range is 0...0xffff */

#define DSMARK_EMBEDDED_SZ	16
	
struct mask_value	embedded[DSMARK_EMBEDDED_SZ];
};



static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
{
	return index <= p->indices && index > 0;
}

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Thomas Graf
26
100.00%
1
100.00%
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26
100.00%
1
100.00%

/* ------------------------- Class/flow operations ------------------------- */



static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
			struct Qdisc *new, struct Qdisc **old)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);

	pr_debug("%s(sch %p,[qdisc %p],new %p,old %p)\n",
		 __func__, sch, p, new, old);

	if (new == NULL) {
		new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
					sch->handle);
		if (new == NULL)
			new = &noop_qdisc;
	}

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

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Linus Torvalds (pre-git)
64
61.54%
1
11.11%
Thomas Graf
18
17.31%
1
11.11%
Patrick McHardy
7
6.73%
3
33.33%
Américo Wang
6
5.77%
1
11.11%
David S. Miller
4
3.85%
1
11.11%
Yang Yingliang
3
2.88%
1
11.11%
Stephen Hemminger
2
1.92%
1
11.11%
Total
104
100.00%
9
100.00%



static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	return p->q;
}

Contributors
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Linus Torvalds (pre-git)
18
56.25%
1
33.33%
Stephen Hemminger
9
28.12%
1
33.33%
Linus Torvalds
5
15.62%
1
33.33%
Total
32
100.00%
3
100.00%



static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
{
	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
		 __func__, sch, qdisc_priv(sch), classid);

	return TC_H_MIN(classid) + 1;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
31
79.49%
1
25.00%
Yang Yingliang
3
7.69%
1
25.00%
Thomas Graf
3
7.69%
1
25.00%
Stephen Hemminger
2
5.13%
1
25.00%
Total
39
100.00%
4
100.00%



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

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Linus Torvalds (pre-git)
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%



static void dsmark_put(struct Qdisc *sch, unsigned long cl)
{
}

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Linus Torvalds (pre-git)
14
100.00%
1
100.00%
Total
14
100.00%
1
100.00%


static const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = {
	[TCA_DSMARK_INDICES]		= { .type = NLA_U16 },
	[TCA_DSMARK_DEFAULT_INDEX]	= { .type = NLA_U16 },
	[TCA_DSMARK_SET_TC_INDEX]	= { .type = NLA_FLAG },
	[TCA_DSMARK_MASK]		= { .type = NLA_U8 },
	[TCA_DSMARK_VALUE]		= { .type = NLA_U8 },
};



static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
			 struct nlattr **tca, unsigned long *arg)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct nlattr *opt = tca[TCA_OPTIONS];
	struct nlattr *tb[TCA_DSMARK_MAX + 1];
	int err = -EINVAL;

	pr_debug("%s(sch %p,[qdisc %p],classid %x,parent %x), arg 0x%lx\n",
		 __func__, sch, p, classid, parent, *arg);

	if (!dsmark_valid_index(p, *arg)) {
		err = -ENOENT;
		goto errout;
	}

	if (!opt)
		goto errout;

	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
	if (err < 0)
		goto errout;

	if (tb[TCA_DSMARK_VALUE])
		p->mv[*arg - 1].value = nla_get_u8(tb[TCA_DSMARK_VALUE]);

	if (tb[TCA_DSMARK_MASK])
		p->mv[*arg - 1].mask = nla_get_u8(tb[TCA_DSMARK_MASK]);

	err = 0;

errout:
	return err;
}

Contributors
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Linus Torvalds (pre-git)
117
59.69%
1
12.50%
Patrick McHardy
33
16.84%
3
37.50%
Thomas Graf
28
14.29%
1
12.50%
Eric Dumazet
13
6.63%
1
12.50%
Yang Yingliang
3
1.53%
1
12.50%
Stephen Hemminger
2
1.02%
1
12.50%
Total
196
100.00%
8
100.00%



static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);

	if (!dsmark_valid_index(p, arg))
		return -EINVAL;

	p->mv[arg - 1].mask = 0xff;
	p->mv[arg - 1].value = 0;

	return 0;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
56
82.35%
1
25.00%
Eric Dumazet
6
8.82%
1
25.00%
Thomas Graf
5
7.35%
1
25.00%
Stephen Hemminger
1
1.47%
1
25.00%
Total
68
100.00%
4
100.00%



static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	int i;

	pr_debug("%s(sch %p,[qdisc %p],walker %p)\n",
		 __func__, sch, p, walker);

	if (walker->stop)
		return;

	for (i = 0; i < p->indices; i++) {
		if (p->mv[i].mask == 0xff && !p->mv[i].value)
			goto ignore;
		if (walker->count >= walker->skip) {
			if (walker->fn(sch, i + 1, walker) < 0) {
				walker->stop = 1;
				break;
			}
		}
ignore:
		walker->count++;
	}
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
121
88.32%
1
20.00%
Eric Dumazet
6
4.38%
1
20.00%
Thomas Graf
5
3.65%
1
20.00%
Yang Yingliang
3
2.19%
1
20.00%
Stephen Hemminger
2
1.46%
1
20.00%
Total
137
100.00%
5
100.00%



static inline struct tcf_proto __rcu **dsmark_find_tcf(struct Qdisc *sch,
						       unsigned long cl)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	return &p->filter_list;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
24
66.67%
1
33.33%
Stephen Hemminger
11
30.56%
1
33.33%
John Fastabend
1
2.78%
1
33.33%
Total
36
100.00%
3
100.00%

/* --------------------------- Qdisc operations ---------------------------- */



static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch,
			  struct sk_buff **to_free)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	int err;

	pr_debug("%s(skb %p,sch %p,[qdisc %p])\n", __func__, skb, sch, p);

	if (p->set_tc_index) {
		int wlen = skb_network_offset(skb);

		switch (tc_skb_protocol(skb)) {
		case htons(ETH_P_IP):
			wlen += sizeof(struct iphdr);
			if (!pskb_may_pull(skb, wlen) ||
			    skb_try_make_writable(skb, wlen))
				goto drop;

			skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
				& ~INET_ECN_MASK;
			break;

		case htons(ETH_P_IPV6):
			wlen += sizeof(struct ipv6hdr);
			if (!pskb_may_pull(skb, wlen) ||
			    skb_try_make_writable(skb, wlen))
				goto drop;

			skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
				& ~INET_ECN_MASK;
			break;
		default:
			skb->tc_index = 0;
			break;
		}
	}

	if (TC_H_MAJ(skb->priority) == sch->handle)
		skb->tc_index = TC_H_MIN(skb->priority);
	else {
		struct tcf_result res;
		struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
		int result = tc_classify(skb, fl, &res, false);

		pr_debug("result %d class 0x%04x\n", result, res.classid);

		switch (result) {
#ifdef CONFIG_NET_CLS_ACT
		case TC_ACT_QUEUED:
		case TC_ACT_STOLEN:
			__qdisc_drop(skb, to_free);
			return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;

		case TC_ACT_SHOT:
			goto drop;
#endif
		case TC_ACT_OK:
			skb->tc_index = TC_H_MIN(res.classid);
			break;

		default:
			if (p->default_index != NO_DEFAULT_INDEX)
				skb->tc_index = p->default_index;
			break;
		}
	}

	err = qdisc_enqueue(skb, p->q, to_free);
	if (err != NET_XMIT_SUCCESS) {
		if (net_xmit_drop_count(err))
			qdisc_qstats_drop(sch);
		return err;
	}

	qdisc_qstats_backlog_inc(sch, skb);
	sch->q.qlen++;

	return NET_XMIT_SUCCESS;

drop:
	qdisc_drop(skb, sch, to_free);
	return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
}

Contributors
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Linus Torvalds (pre-git)
199
51.42%
1
4.35%
Eric Dumazet
58
14.99%
3
13.04%
Stephen Hemminger
36
9.30%
2
8.70%
Thomas Graf
22
5.68%
2
8.70%
Patrick McHardy
18
4.65%
2
8.70%
John Fastabend
16
4.13%
2
8.70%
Jarek Poplawski
12
3.10%
2
8.70%
Arnaldo Carvalho de Melo
8
2.07%
3
13.04%
Américo Wang
7
1.81%
1
4.35%
Yang Yingliang
3
0.78%
1
4.35%
Jiri Pirko
3
0.78%
1
4.35%
Linus Torvalds
2
0.52%
1
4.35%
Daniel Borkmann
2
0.52%
1
4.35%
Jussi Kivilinna
1
0.26%
1
4.35%
Total
387
100.00%
23
100.00%



static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct sk_buff *skb;
	u32 index;

	pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);

	skb = qdisc_dequeue_peeked(p->q);
	if (skb == NULL)
		return NULL;

	qdisc_bstats_update(sch, skb);
	qdisc_qstats_backlog_dec(sch, skb);
	sch->q.qlen--;

	index = skb->tc_index & (p->indices - 1);
	pr_debug("index %d->%d\n", skb->tc_index, index);

	switch (tc_skb_protocol(skb)) {
	case htons(ETH_P_IP):
		ipv4_change_dsfield(ip_hdr(skb), p->mv[index].mask,
				    p->mv[index].value);
			break;
	case htons(ETH_P_IPV6):
		ipv6_change_dsfield(ipv6_hdr(skb), p->mv[index].mask,
				    p->mv[index].value);
			break;
	default:
		/*
                 * Only complain if a change was actually attempted.
                 * This way, we can send non-IP traffic through dsmark
                 * and don't need yet another qdisc as a bypass.
                 */
		if (p->mv[index].mask != 0xff || p->mv[index].value)
			pr_warn("%s: unsupported protocol %d\n",
				__func__, ntohs(tc_skb_protocol(skb)));
		break;
	}

	return skb;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
162
72.32%
1
6.67%
Eric Dumazet
25
11.16%
2
13.33%
Arnaldo Carvalho de Melo
8
3.57%
3
20.00%
Yang Yingliang
7
3.12%
2
13.33%
Américo Wang
7
3.12%
1
6.67%
Jiri Pirko
6
2.68%
1
6.67%
Stephen Hemminger
4
1.79%
2
13.33%
Thomas Graf
3
1.34%
1
6.67%
Kyeong Yoo
1
0.45%
1
6.67%
Al Viro
1
0.45%
1
6.67%
Total
224
100.00%
15
100.00%



static struct sk_buff *dsmark_peek(struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);

	pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);

	return p->q->ops->peek(p->q);
}

Contributors
Person
Tokens
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CommitProp
Jarek Poplawski
45
93.75%
1
50.00%
Yang Yingliang
3
6.25%
1
50.00%
Total
48
100.00%
2
100.00%



static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct nlattr *tb[TCA_DSMARK_MAX + 1];
	int err = -EINVAL;
	u32 default_index = NO_DEFAULT_INDEX;
	u16 indices;
	int i;

	pr_debug("%s(sch %p,[qdisc %p],opt %p)\n", __func__, sch, p, opt);

	if (!opt)
		goto errout;

	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
	if (err < 0)
		goto errout;

	err = -EINVAL;
	indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);

	if (hweight32(indices) != 1)
		goto errout;

	if (tb[TCA_DSMARK_DEFAULT_INDEX])
		default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);

	if (indices <= DSMARK_EMBEDDED_SZ)
		p->mv = p->embedded;
	else
		p->mv = kmalloc_array(indices, sizeof(*p->mv), GFP_KERNEL);
	if (!p->mv) {
		err = -ENOMEM;
		goto errout;
	}
	for (i = 0; i < indices; i++) {
		p->mv[i].mask = 0xff;
		p->mv[i].value = 0;
	}
	p->indices = indices;
	p->default_index = default_index;
	p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);

	p->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, sch->handle);
	if (p->q == NULL)
		p->q = &noop_qdisc;

	pr_debug("%s: qdisc %p\n", __func__, p->q);

	err = 0;
errout:
	return err;
}

Contributors
Person
Tokens
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CommitProp
Linus Torvalds (pre-git)
131
42.95%
1
7.69%
Thomas Graf
69
22.62%
1
7.69%
Eric Dumazet
57
18.69%
1
7.69%
Patrick McHardy
29
9.51%
4
30.77%
David S. Miller
7
2.30%
2
15.38%
Yang Yingliang
6
1.97%
1
7.69%
Stephen Hemminger
3
0.98%
1
7.69%
Jamal Hadi Salim
2
0.66%
1
7.69%
Adrian Bunk
1
0.33%
1
7.69%
Total
305
100.00%
13
100.00%



static void dsmark_reset(struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);

	pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
	qdisc_reset(p->q);
	sch->qstats.backlog = 0;
	sch->q.qlen = 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
42
76.36%
1
25.00%
Américo Wang
8
14.55%
1
25.00%
Yang Yingliang
3
5.45%
1
25.00%
Stephen Hemminger
2
3.64%
1
25.00%
Total
55
100.00%
4
100.00%



static void dsmark_destroy(struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);

	pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);

	tcf_destroy_chain(&p->filter_list);
	qdisc_destroy(p->q);
	if (p->mv != p->embedded)
		kfree(p->mv);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
45
70.31%
1
16.67%
Eric Dumazet
11
17.19%
1
16.67%
Patrick McHardy
3
4.69%
2
33.33%
Yang Yingliang
3
4.69%
1
16.67%
Stephen Hemminger
2
3.12%
1
16.67%
Total
64
100.00%
6
100.00%



static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
			     struct sk_buff *skb, struct tcmsg *tcm)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct nlattr *opts = NULL;

	pr_debug("%s(sch %p,[qdisc %p],class %ld\n", __func__, sch, p, cl);

	if (!dsmark_valid_index(p, cl))
		return -EINVAL;

	tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl - 1);
	tcm->tcm_info = p->q->handle;

	opts = nla_nest_start(skb, TCA_OPTIONS);
	if (opts == NULL)
		goto nla_put_failure;
	if (nla_put_u8(skb, TCA_DSMARK_MASK, p->mv[cl - 1].mask) ||
	    nla_put_u8(skb, TCA_DSMARK_VALUE, p->mv[cl - 1].value))
		goto nla_put_failure;

	return nla_nest_end(skb, opts);

nla_put_failure:
	nla_nest_cancel(skb, opts);
	return -EMSGSIZE;
}

Contributors
Person
Tokens
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Commits
CommitProp
Linus Torvalds (pre-git)
115
64.97%
1
11.11%
Patrick McHardy
24
13.56%
2
22.22%
Thomas Graf
18
10.17%
2
22.22%
David S. Miller
9
5.08%
1
11.11%
Eric Dumazet
6
3.39%
1
11.11%
Yang Yingliang
3
1.69%
1
11.11%
Stephen Hemminger
2
1.13%
1
11.11%
Total
177
100.00%
9
100.00%



static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct nlattr *opts = NULL;

	opts = nla_nest_start(skb, TCA_OPTIONS);
	if (opts == NULL)
		goto nla_put_failure;
	if (nla_put_u16(skb, TCA_DSMARK_INDICES, p->indices))
		goto nla_put_failure;

	if (p->default_index != NO_DEFAULT_INDEX &&
	    nla_put_u16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index))
		goto nla_put_failure;

	if (p->set_tc_index &&
	    nla_put_flag(skb, TCA_DSMARK_SET_TC_INDEX))
		goto nla_put_failure;

	return nla_nest_end(skb, opts);

nla_put_failure:
	nla_nest_cancel(skb, opts);
	return -EMSGSIZE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
74
58.73%
1
14.29%
David S. Miller
19
15.08%
1
14.29%
Thomas Graf
16
12.70%
2
28.57%
Patrick McHardy
14
11.11%
1
14.29%
Linus Torvalds
2
1.59%
1
14.29%
Stephen Hemminger
1
0.79%
1
14.29%
Total
126
100.00%
7
100.00%


static const struct Qdisc_class_ops dsmark_class_ops = {
	.graft		=	dsmark_graft,
	.leaf		=	dsmark_leaf,
	.get		=	dsmark_get,
	.put		=	dsmark_put,
	.change		=	dsmark_change,
	.delete		=	dsmark_delete,
	.walk		=	dsmark_walk,
	.tcf_chain	=	dsmark_find_tcf,
	.bind_tcf	=	dsmark_bind_filter,
	.unbind_tcf	=	dsmark_put,
	.dump		=	dsmark_dump_class,
};


static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
	.next		=	NULL,
	.cl_ops		=	&dsmark_class_ops,
	.id		=	"dsmark",
	.priv_size	=	sizeof(struct dsmark_qdisc_data),
	.enqueue	=	dsmark_enqueue,
	.dequeue	=	dsmark_dequeue,
	.peek		=	dsmark_peek,
	.init		=	dsmark_init,
	.reset		=	dsmark_reset,
	.destroy	=	dsmark_destroy,
	.change		=	NULL,
	.dump		=	dsmark_dump,
	.owner		=	THIS_MODULE,
};



static int __init dsmark_module_init(void)
{
	return register_qdisc(&dsmark_qdisc_ops);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
13
81.25%
1
50.00%
Al Viro
3
18.75%
1
50.00%
Total
16
100.00%
2
100.00%



static void __exit dsmark_module_exit(void)
{
	unregister_qdisc(&dsmark_qdisc_ops);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
12
80.00%
1
50.00%
Al Viro
3
20.00%
1
50.00%
Total
15
100.00%
2
100.00%

module_init(dsmark_module_init)
module_exit(dsmark_module_exit)

MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
1372
56.65%
2
3.28%
Thomas Graf
218
9.00%
7
11.48%
Eric Dumazet
211
8.71%
6
9.84%
Patrick McHardy
196
8.09%
11
18.03%
Stephen Hemminger
79
3.26%
3
4.92%
Dave Jones
67
2.77%
1
1.64%
Jarek Poplawski
62
2.56%
3
4.92%
David S. Miller
51
2.11%
5
8.20%
Yang Yingliang
40
1.65%
2
3.28%
Américo Wang
28
1.16%
2
3.28%
Linus Torvalds
26
1.07%
4
6.56%
John Fastabend
18
0.74%
2
3.28%
Al Viro
16
0.66%
2
3.28%
Arnaldo Carvalho de Melo
16
0.66%
3
4.92%
Jiri Pirko
12
0.50%
2
3.28%
Tejun Heo
3
0.12%
1
1.64%
Daniel Borkmann
2
0.08%
1
1.64%
Jamal Hadi Salim
2
0.08%
1
1.64%
Jussi Kivilinna
1
0.04%
1
1.64%
Kyeong Yoo
1
0.04%
1
1.64%
Adrian Bunk
1
0.04%
1
1.64%
Total
2422
100.00%
61
100.00%
Directory: net/sched

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