Release 4.11 net/core/flow.c

/* flow.c: Generic flow cache.
 *
 * Copyright (C) 2003 Alexey N. Kuznetsov (kuznet@ms2.inr.ac.ru)
 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/jhash.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/completion.h>
#include <linux/percpu.h>
#include <linux/bitops.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/mutex.h>
#include <net/flow.h>
#include <linux/atomic.h>
#include <linux/security.h>
#include <net/net_namespace.h>


struct flow_cache_entry {
	union {
		
struct hlist_node	hlist;
		
struct list_head	gc_list;
	} 
u;
	
struct net			*net;
	
u16				family;
	
u8				dir;
	
u32				genid;
	
struct flowi			key;
	
struct flow_cache_object	*object;
};


struct flow_flush_info {
	
struct flow_cache		*cache;
	
atomic_t			cpuleft;
	
struct completion		completion;
};


static struct kmem_cache *flow_cachep __read_mostly;


#define flow_cache_hash_size(cache)	(1 << (cache)->hash_shift)

#define FLOW_HASH_RND_PERIOD		(10 * 60 * HZ)



static void flow_cache_new_hashrnd(unsigned long arg)
{
	struct flow_cache *fc = (void *) arg;
	int i;

	for_each_possible_cpu(i)
		per_cpu_ptr(fc->percpu, i)->hash_rnd_recalc = 1;

	fc->rnd_timer.expires = jiffies + FLOW_HASH_RND_PERIOD;
	add_timer(&fc->rnd_timer);
}

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David S. Miller
31
52.54%
2
33.33%
Timo Teräs
24
40.68%
1
16.67%
Herbert Xu
2
3.39%
1
16.67%
Kamezawa Hiroyuki
1
1.69%
1
16.67%
Rusty Russell
1
1.69%
1
16.67%
Total
59
100.00%
6
100.00%



static int flow_entry_valid(struct flow_cache_entry *fle,
				struct netns_xfrm *xfrm)
{
	if (atomic_read(&xfrm->flow_cache_genid) != fle->genid)
		return 0;
	if (fle->object && !fle->object->ops->check(fle->object))
		return 0;
	return 1;
}

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52
88.14%
1
50.00%
Fan Du
7
11.86%
1
50.00%
Total
59
100.00%
2
100.00%



static void flow_entry_kill(struct flow_cache_entry *fle,
				struct netns_xfrm *xfrm)
{
	if (fle->object)
		fle->object->ops->delete(fle->object);
	kmem_cache_free(flow_cachep, fle);
}

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James Morris
27
64.29%
1
20.00%
Timo Teräs
10
23.81%
3
60.00%
Fan Du
5
11.90%
1
20.00%
Total
42
100.00%
5
100.00%



static void flow_cache_gc_task(struct work_struct *work)
{
	struct list_head gc_list;
	struct flow_cache_entry *fce, *n;
	struct netns_xfrm *xfrm = container_of(work, struct netns_xfrm,
						flow_cache_gc_work);

	INIT_LIST_HEAD(&gc_list);
	spin_lock_bh(&xfrm->flow_cache_gc_lock);
	list_splice_tail_init(&xfrm->flow_cache_gc_list, &gc_list);
	spin_unlock_bh(&xfrm->flow_cache_gc_lock);

	list_for_each_entry_safe(fce, n, &gc_list, u.gc_list) {
		flow_entry_kill(fce, xfrm);
		atomic_dec(&xfrm->flow_cache_gc_count);
	}
}

Contributors
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Timo Teräs
65
66.33%
1
33.33%
Fan Du
23
23.47%
1
33.33%
Steffen Klassert
10
10.20%
1
33.33%
Total
98
100.00%
3
100.00%



static void flow_cache_queue_garbage(struct flow_cache_percpu *fcp,
				     int deleted, struct list_head *gc_list,
				     struct netns_xfrm *xfrm)
{
	if (deleted) {
		atomic_add(deleted, &xfrm->flow_cache_gc_count);
		fcp->hash_count -= deleted;
		spin_lock_bh(&xfrm->flow_cache_gc_lock);
		list_splice_tail(gc_list, &xfrm->flow_cache_gc_list);
		spin_unlock_bh(&xfrm->flow_cache_gc_lock);
		schedule_work(&xfrm->flow_cache_gc_work);
	}
}

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Timo Teräs
55
68.75%
2
40.00%
Fan Du
13
16.25%
1
20.00%
Steffen Klassert
10
12.50%
1
20.00%
James Morris
2
2.50%
1
20.00%
Total
80
100.00%
5
100.00%



static void __flow_cache_shrink(struct flow_cache *fc,
				struct flow_cache_percpu *fcp,
				int shrink_to)
{
	struct flow_cache_entry *fle;
	struct hlist_node *tmp;
	LIST_HEAD(gc_list);
	int i, deleted = 0;
	struct netns_xfrm *xfrm = container_of(fc, struct netns_xfrm,
						flow_cache_global);

	for (i = 0; i < flow_cache_hash_size(fc); i++) {
		int saved = 0;

		hlist_for_each_entry_safe(fle, tmp,
					  &fcp->hash_table[i], u.hlist) {
			if (saved < shrink_to &&
			    flow_entry_valid(fle, xfrm)) {
				saved++;
			} else {
				deleted++;
				hlist_del(&fle->u.hlist);
				list_add_tail(&fle->u.gc_list, &gc_list);
			}
		}
	}

	flow_cache_queue_garbage(fcp, deleted, &gc_list, xfrm);
}

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Timo Teräs
78
52.00%
3
50.00%
David S. Miller
53
35.33%
2
33.33%
Fan Du
19
12.67%
1
16.67%
Total
150
100.00%
6
100.00%



static void flow_cache_shrink(struct flow_cache *fc,
			      struct flow_cache_percpu *fcp)
{
	int shrink_to = fc->low_watermark / flow_cache_hash_size(fc);

	__flow_cache_shrink(fc, fcp, shrink_to);
}

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Timo Teräs
19
51.35%
1
50.00%
David S. Miller
18
48.65%
1
50.00%
Total
37
100.00%
2
100.00%



static void flow_new_hash_rnd(struct flow_cache *fc,
			      struct flow_cache_percpu *fcp)
{
	get_random_bytes(&fcp->hash_rnd, sizeof(u32));
	fcp->hash_rnd_recalc = 0;
	__flow_cache_shrink(fc, fcp, 0);
}

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David S. Miller
26
59.09%
1
50.00%
Timo Teräs
18
40.91%
1
50.00%
Total
44
100.00%
2
100.00%



static u32 flow_hash_code(struct flow_cache *fc,
			  struct flow_cache_percpu *fcp,
			  const struct flowi *key,
			  size_t keysize)
{
	const u32 *k = (const u32 *) key;
	const u32 length = keysize * sizeof(flow_compare_t) / sizeof(u32);

	return jhash2(k, length, fcp->hash_rnd)
		& (flow_cache_hash_size(fc) - 1);
}

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David S. Miller
40
54.05%
2
50.00%
Timo Teräs
17
22.97%
1
25.00%
David Ward
17
22.97%
1
25.00%
Total
74
100.00%
4
100.00%

/* I hear what you're saying, use memcmp.  But memcmp cannot make
 * important assumptions that we can here, such as alignment.
 */


static int flow_key_compare(const struct flowi *key1, const struct flowi *key2,
			    size_t keysize)
{
	const flow_compare_t *k1, *k1_lim, *k2;

	k1 = (const flow_compare_t *) key1;
	k1_lim = k1 + keysize;

	k2 = (const flow_compare_t *) key2;

	do {
		if (*k1++ != *k2++)
			return 1;
	} while (k1 < k1_lim);

	return 0;
}

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David S. Miller
78
95.12%
2
66.67%
David Ward
4
4.88%
1
33.33%
Total
82
100.00%
3
100.00%


struct flow_cache_object *

flow_cache_lookup(struct net *net, const struct flowi *key, u16 family, u8 dir,
		  flow_resolve_t resolver, void *ctx)
{
	struct flow_cache *fc = &net->xfrm.flow_cache_global;
	struct flow_cache_percpu *fcp;
	struct flow_cache_entry *fle, *tfle;
	struct flow_cache_object *flo;
	size_t keysize;
	unsigned int hash;

	local_bh_disable();
	fcp = this_cpu_ptr(fc->percpu);

	fle = NULL;
	flo = NULL;

	keysize = flow_key_size(family);
	if (!keysize)
		goto nocache;

	/* Packet really early in init?  Making flow_cache_init a
         * pre-smp initcall would solve this.  --RR */
	if (!fcp->hash_table)
		goto nocache;

	if (fcp->hash_rnd_recalc)
		flow_new_hash_rnd(fc, fcp);

	hash = flow_hash_code(fc, fcp, key, keysize);
	hlist_for_each_entry(tfle, &fcp->hash_table[hash], u.hlist) {
		if (tfle->net == net &&
		    tfle->family == family &&
		    tfle->dir == dir &&
		    flow_key_compare(key, &tfle->key, keysize) == 0) {
			fle = tfle;
			break;
		}
	}

	if (unlikely(!fle)) {
		if (fcp->hash_count > fc->high_watermark)
			flow_cache_shrink(fc, fcp);

		if (atomic_read(&net->xfrm.flow_cache_gc_count) >
		    2 * num_online_cpus() * fc->high_watermark) {
			flo = ERR_PTR(-ENOBUFS);
			goto ret_object;
		}

		fle = kmem_cache_alloc(flow_cachep, GFP_ATOMIC);
		if (fle) {
			fle->net = net;
			fle->family = family;
			fle->dir = dir;
			memcpy(&fle->key, key, keysize * sizeof(flow_compare_t));
			fle->object = NULL;
			hlist_add_head(&fle->u.hlist, &fcp->hash_table[hash]);
			fcp->hash_count++;
		}
	} else if (likely(fle->genid == atomic_read(&net->xfrm.flow_cache_genid))) {
		flo = fle->object;
		if (!flo)
			goto ret_object;
		flo = flo->ops->get(flo);
		if (flo)
			goto ret_object;
	} else if (fle->object) {
	        flo = fle->object;
	        flo->ops->delete(flo);
	        fle->object = NULL;
	}

nocache:
	flo = NULL;
	if (fle) {
		flo = fle->object;
		fle->object = NULL;
	}
	flo = resolver(net, key, family, dir, flo, ctx);
	if (fle) {
		fle->genid = atomic_read(&net->xfrm.flow_cache_genid);
		if (!IS_ERR(flo))
			fle->object = flo;
		else
			fle->genid--;
	} else {
		if (!IS_ERR_OR_NULL(flo))
			flo->ops->delete(flo);
	}
ret_object:
	local_bh_enable();
	return flo;
}
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Timo Teräs
227
43.32%
3
15.79%
David S. Miller
118
22.52%
3
15.79%
Herbert Xu
82
15.65%
2
10.53%
David Ward
37
7.06%
2
10.53%
Steffen Klassert
29
5.53%
1
5.26%
Fan Du
12
2.29%
1
5.26%
Alexey Dobriyan
7
1.34%
1
5.26%
Miroslav Urbanek
5
0.95%
1
5.26%
James Morris
3
0.57%
1
5.26%
Eric Dumazet
1
0.19%
1
5.26%
Christoph Lameter
1
0.19%
1
5.26%
Rusty Russell
1
0.19%
1
5.26%
Hideaki Yoshifuji / 吉藤英明
1
0.19%
1
5.26%
Total
524
100.00%
19
100.00%


EXPORT_SYMBOL(flow_cache_lookup);



static void flow_cache_flush_tasklet(unsigned long data)
{
	struct flow_flush_info *info = (void *)data;
	struct flow_cache *fc = info->cache;
	struct flow_cache_percpu *fcp;
	struct flow_cache_entry *fle;
	struct hlist_node *tmp;
	LIST_HEAD(gc_list);
	int i, deleted = 0;
	struct netns_xfrm *xfrm = container_of(fc, struct netns_xfrm,
						flow_cache_global);

	fcp = this_cpu_ptr(fc->percpu);
	for (i = 0; i < flow_cache_hash_size(fc); i++) {
		hlist_for_each_entry_safe(fle, tmp,
					  &fcp->hash_table[i], u.hlist) {
			if (flow_entry_valid(fle, xfrm))
				continue;

			deleted++;
			hlist_del(&fle->u.hlist);
			list_add_tail(&fle->u.gc_list, &gc_list);
		}
	}

	flow_cache_queue_garbage(fcp, deleted, &gc_list, xfrm);

	if (atomic_dec_and_test(&info->cpuleft))
		complete(&info->completion);
}

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Timo Teräs
92
51.98%
3
37.50%
Herbert Xu
60
33.90%
2
25.00%
Fan Du
19
10.73%
1
12.50%
David S. Miller
5
2.82%
1
12.50%
Eric Dumazet
1
0.56%
1
12.50%
Total
177
100.00%
8
100.00%

/*
 * Return whether a cpu needs flushing.  Conservatively, we assume
 * the presence of any entries means the core may require flushing,
 * since the flow_cache_ops.check() function may assume it's running
 * on the same core as the per-cpu cache component.
 */


static int flow_cache_percpu_empty(struct flow_cache *fc, int cpu)
{
	struct flow_cache_percpu *fcp;
	int i;

	fcp = per_cpu_ptr(fc->percpu, cpu);
	for (i = 0; i < flow_cache_hash_size(fc); i++)
		if (!hlist_empty(&fcp->hash_table[i]))
			return 0;
	return 1;
}

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Chris Metcalf
68
98.55%
1
50.00%
Li RongQing
1
1.45%
1
50.00%
Total
69
100.00%
2
100.00%



static void flow_cache_flush_per_cpu(void *data)
{
	struct flow_flush_info *info = data;
	struct tasklet_struct *tasklet;

	tasklet = &this_cpu_ptr(info->cache->percpu)->flush_tasklet;
	tasklet->data = (unsigned long)info;
	tasklet_schedule(tasklet);
}

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Herbert Xu
37
72.55%
2
33.33%
Timo Teräs
7
13.73%
1
16.67%
David S. Miller
4
7.84%
1
16.67%
Li RongQing
2
3.92%
1
16.67%
Shan Wei
1
1.96%
1
16.67%
Total
51
100.00%
6
100.00%



void flow_cache_flush(struct net *net)
{
	struct flow_flush_info info;
	cpumask_var_t mask;
	int i, self;

	/* Track which cpus need flushing to avoid disturbing all cores. */
	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
		return;
	cpumask_clear(mask);

	/* Don't want cpus going down or up during this. */
	get_online_cpus();
	mutex_lock(&net->xfrm.flow_flush_sem);
	info.cache = &net->xfrm.flow_cache_global;
	for_each_online_cpu(i)
		if (!flow_cache_percpu_empty(info.cache, i))
			cpumask_set_cpu(i, mask);
	atomic_set(&info.cpuleft, cpumask_weight(mask));
	if (atomic_read(&info.cpuleft) == 0)
		goto done;

	init_completion(&info.completion);

	local_bh_disable();
	self = cpumask_test_and_clear_cpu(smp_processor_id(), mask);
	on_each_cpu_mask(mask, flow_cache_flush_per_cpu, &info, 0);
	if (self)
		flow_cache_flush_tasklet((unsigned long)&info);
	local_bh_enable();

	wait_for_completion(&info.completion);

done:
	mutex_unlock(&net->xfrm.flow_flush_sem);
	put_online_cpus();
	free_cpumask_var(mask);
}

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Chris Metcalf
92
47.42%
1
8.33%
Herbert Xu
50
25.77%
4
33.33%
Fan Du
16
8.25%
1
8.33%
Andrew Morton
13
6.70%
2
16.67%
David S. Miller
12
6.19%
1
8.33%
Timo Teräs
7
3.61%
1
8.33%
Gautham R. Shenoy
2
1.03%
1
8.33%
Arjan van de Ven
2
1.03%
1
8.33%
Total
194
100.00%
12
100.00%



static void flow_cache_flush_task(struct work_struct *work)
{
	struct netns_xfrm *xfrm = container_of(work, struct netns_xfrm,
						flow_cache_flush_work);
	struct net *net = container_of(xfrm, struct net, xfrm);

	flow_cache_flush(net);
}

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Fan Du
31
67.39%
1
33.33%
Steffen Klassert
14
30.43%
1
33.33%
Miroslav Urbanek
1
2.17%
1
33.33%
Total
46
100.00%
3
100.00%



void flow_cache_flush_deferred(struct net *net)
{
	schedule_work(&net->xfrm.flow_cache_flush_work);
}

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12
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8
40.00%
1
50.00%
Total
20
100.00%
2
100.00%



static int flow_cache_cpu_prepare(struct flow_cache *fc, int cpu)
{
	struct flow_cache_percpu *fcp = per_cpu_ptr(fc->percpu, cpu);
	size_t sz = sizeof(struct hlist_head) * flow_cache_hash_size(fc);

	if (!fcp->hash_table) {
		fcp->hash_table = kzalloc_node(sz, GFP_KERNEL, cpu_to_node(cpu));
		if (!fcp->hash_table) {
			pr_err("NET: failed to allocate flow cache sz %zu\n", sz);
			return -ENOMEM;
		}
		fcp->hash_rnd_recalc = 1;
		fcp->hash_count = 0;
		tasklet_init(&fcp->flush_tasklet, flow_cache_flush_tasklet, 0);
	}
	return 0;
}

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56
49.12%
1
14.29%
Timo Teräs
24
21.05%
1
14.29%
Herbert Xu
19
16.67%
2
28.57%
David S. Miller
11
9.65%
2
28.57%
Rusty Russell
4
3.51%
1
14.29%
Total
114
100.00%
7
100.00%



static int flow_cache_cpu_up_prep(unsigned int cpu, struct hlist_node *node)
{
	struct flow_cache *fc = hlist_entry_safe(node, struct flow_cache, node);

	return flow_cache_cpu_prepare(fc, cpu);
}

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Sebastian Andrzej Siewior
18
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1
33.33%
Timo Teräs
12
31.58%
1
33.33%
Rusty Russell
8
21.05%
1
33.33%
Total
38
100.00%
3
100.00%



static int flow_cache_cpu_dead(unsigned int cpu, struct hlist_node *node)
{
	struct flow_cache *fc = hlist_entry_safe(node, struct flow_cache, node);
	struct flow_cache_percpu *fcp = per_cpu_ptr(fc->percpu, cpu);

	__flow_cache_shrink(fc, fcp, 0);
	return 0;
}

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Sebastian Andrzej Siewior
26
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1
33.33%
Timo Teräs
21
37.50%
1
33.33%
Rusty Russell
9
16.07%
1
33.33%
Total
56
100.00%
3
100.00%



int flow_cache_init(struct net *net)
{
	int i;
	struct flow_cache *fc = &net->xfrm.flow_cache_global;

	if (!flow_cachep)
		flow_cachep = kmem_cache_create("flow_cache",
						sizeof(struct flow_cache_entry),
						0, SLAB_PANIC, NULL);
	spin_lock_init(&net->xfrm.flow_cache_gc_lock);
	INIT_LIST_HEAD(&net->xfrm.flow_cache_gc_list);
	INIT_WORK(&net->xfrm.flow_cache_gc_work, flow_cache_gc_task);
	INIT_WORK(&net->xfrm.flow_cache_flush_work, flow_cache_flush_task);
	mutex_init(&net->xfrm.flow_flush_sem);
	atomic_set(&net->xfrm.flow_cache_gc_count, 0);

	fc->hash_shift = 10;
	fc->low_watermark = 2 * flow_cache_hash_size(fc);
	fc->high_watermark = 4 * flow_cache_hash_size(fc);

	fc->percpu = alloc_percpu(struct flow_cache_percpu);
	if (!fc->percpu)
		return -ENOMEM;

	if (cpuhp_state_add_instance(CPUHP_NET_FLOW_PREPARE, &fc->node))
		goto err;

	setup_timer(&fc->rnd_timer, flow_cache_new_hashrnd,
		    (unsigned long) fc);
	fc->rnd_timer.expires = jiffies + FLOW_HASH_RND_PERIOD;
	add_timer(&fc->rnd_timer);

	return 0;

err:
	for_each_possible_cpu(i) {
		struct flow_cache_percpu *fcp = per_cpu_ptr(fc->percpu, i);
		kfree(fcp->hash_table);
		fcp->hash_table = NULL;
	}

	free_percpu(fc->percpu);
	fc->percpu = NULL;

	return -ENOMEM;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Fan Du
87
32.46%
1
9.09%
Huajun Li
55
20.52%
1
9.09%
Timo Teräs
48
17.91%
1
9.09%
Eric Dumazet
26
9.70%
2
18.18%
David S. Miller
22
8.21%
1
9.09%
Steffen Klassert
12
4.48%
1
9.09%
Herbert Xu
8
2.99%
2
18.18%
Sebastian Andrzej Siewior
6
2.24%
1
9.09%
Pavel Emelyanov
4
1.49%
1
9.09%
Total
268
100.00%
11
100.00%


EXPORT_SYMBOL(flow_cache_init);



void flow_cache_fini(struct net *net)
{
	int i;
	struct flow_cache *fc = &net->xfrm.flow_cache_global;

	del_timer_sync(&fc->rnd_timer);

	cpuhp_state_remove_instance_nocalls(CPUHP_NET_FLOW_PREPARE, &fc->node);

	for_each_possible_cpu(i) {
		struct flow_cache_percpu *fcp = per_cpu_ptr(fc->percpu, i);
		kfree(fcp->hash_table);
		fcp->hash_table = NULL;
	}

	free_percpu(fc->percpu);
	fc->percpu = NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Steffen Klassert
85
95.51%
1
50.00%
Sebastian Andrzej Siewior
4
4.49%
1
50.00%
Total
89
100.00%
2
100.00%


EXPORT_SYMBOL(flow_cache_fini);



void __init flow_cache_hp_init(void)
{
	int ret;

	ret = cpuhp_setup_state_multi(CPUHP_NET_FLOW_PREPARE,
				      "net/flow:prepare",
				      flow_cache_cpu_up_prep,
				      flow_cache_cpu_dead);
	WARN_ON(ret < 0);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Sebastian Andrzej Siewior
31
100.00%
1
100.00%
Total
31
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Timo Teräs
801
31.30%
3
6.00%
David S. Miller
468
18.29%
4
8.00%
Herbert Xu
297
11.61%
8
16.00%
Fan Du
245
9.57%
1
2.00%
Steffen Klassert
177
6.92%
3
6.00%
Chris Metcalf
161
6.29%
1
2.00%
Eric Dumazet
99
3.87%
5
10.00%
Sebastian Andrzej Siewior
85
3.32%
1
2.00%
David Ward
64
2.50%
2
4.00%
Huajun Li
55
2.15%
1
2.00%
James Morris
32
1.25%
1
2.00%
Rusty Russell
23
0.90%
2
4.00%
Andrew Morton
13
0.51%
2
4.00%
Alexey Dobriyan
7
0.27%
1
2.00%
Miroslav Urbanek
6
0.23%
2
4.00%
Arjan van de Ven
5
0.20%
1
2.00%
Pavel Emelyanov
4
0.16%
1
2.00%
Arnaldo Carvalho de Melo
3
0.12%
1
2.00%
Linus Torvalds
3
0.12%
1
2.00%
Li RongQing
3
0.12%
2
4.00%
Gautham R. Shenoy
2
0.08%
1
2.00%
Kamezawa Hiroyuki
1
0.04%
1
2.00%
Trent Jaeger
1
0.04%
1
2.00%
Hideaki Yoshifuji / 吉藤英明
1
0.04%
1
2.00%
Shan Wei
1
0.04%
1
2.00%
Christoph Lameter
1
0.04%
1
2.00%
Arun Sharma
1
0.04%
1
2.00%
Total
2559
100.00%
50
100.00%
Directory: net/core

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