[linux-block.git] / net / sched / act_sample.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * net/sched/act_sample.c - Packet sampling tc action
 * Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_sample.h>
#include <net/tc_act/tc_sample.h>
#include <net/psample.h>
#include <net/pkt_cls.h>
#include <net/tc_wrapper.h>

#include <linux/if_arp.h>

static struct tc_action_ops act_sample_ops;

static const struct nla_policy sample_policy[TCA_SAMPLE_MAX + 1] = {
	[TCA_SAMPLE_PARMS]		= { .len = sizeof(struct tc_sample) },
	[TCA_SAMPLE_RATE]		= { .type = NLA_U32 },
	[TCA_SAMPLE_TRUNC_SIZE]		= { .type = NLA_U32 },
	[TCA_SAMPLE_PSAMPLE_GROUP]	= { .type = NLA_U32 },
};

static int tcf_sample_init(struct net *net, struct nlattr *nla,
			   struct nlattr *est, struct tc_action **a,
			   struct tcf_proto *tp,
			   u32 flags, struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, act_sample_ops.net_id);
	bool bind = flags & TCA_ACT_FLAGS_BIND;
	struct nlattr *tb[TCA_SAMPLE_MAX + 1];
	struct psample_group *psample_group;
	u32 psample_group_num, rate, index;
	struct tcf_chain *goto_ch = NULL;
	struct tc_sample *parm;
	struct tcf_sample *s;
	bool exists = false;
	int ret, err;

	if (!nla)
		return -EINVAL;
	ret = nla_parse_nested_deprecated(tb, TCA_SAMPLE_MAX, nla,
					  sample_policy, NULL);
	if (ret < 0)
		return ret;
	if (!tb[TCA_SAMPLE_PARMS] || !tb[TCA_SAMPLE_RATE] ||
	    !tb[TCA_SAMPLE_PSAMPLE_GROUP])
		return -EINVAL;

	parm = nla_data(tb[TCA_SAMPLE_PARMS]);
	index = parm->index;
	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
		return err;
	exists = err;
	if (exists && bind)
		return 0;

	if (!exists) {
		ret = tcf_idr_create(tn, index, est, a,
				     &act_sample_ops, bind, true, flags);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}
		ret = ACT_P_CREATED;
	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
		tcf_idr_release(*a, bind);
		return -EEXIST;
	}
	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
		goto release_idr;

	rate = nla_get_u32(tb[TCA_SAMPLE_RATE]);
	if (!rate) {
		NL_SET_ERR_MSG(extack, "invalid sample rate");
		err = -EINVAL;
		goto put_chain;
	}
	psample_group_num = nla_get_u32(tb[TCA_SAMPLE_PSAMPLE_GROUP]);
	psample_group = psample_group_get(net, psample_group_num);
	if (!psample_group) {
		err = -ENOMEM;
		goto put_chain;
	}

	s = to_sample(*a);

	spin_lock_bh(&s->tcf_lock);
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	s->rate = rate;
	s->psample_group_num = psample_group_num;
	psample_group = rcu_replace_pointer(s->psample_group, psample_group,
					    lockdep_is_held(&s->tcf_lock));

	if (tb[TCA_SAMPLE_TRUNC_SIZE]) {
		s->truncate = true;
		s->trunc_size = nla_get_u32(tb[TCA_SAMPLE_TRUNC_SIZE]);
	}
	spin_unlock_bh(&s->tcf_lock);

	if (psample_group)
		psample_group_put(psample_group);
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);

	return ret;
put_chain:
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
release_idr:
	tcf_idr_release(*a, bind);
	return err;
}

static void tcf_sample_cleanup(struct tc_action *a)
{
	struct tcf_sample *s = to_sample(a);
	struct psample_group *psample_group;

	/* last reference to action, no need to lock */
	psample_group = rcu_dereference_protected(s->psample_group, 1);
	RCU_INIT_POINTER(s->psample_group, NULL);
	if (psample_group)
		psample_group_put(psample_group);
}

static bool tcf_sample_dev_ok_push(struct net_device *dev)
{
	switch (dev->type) {
	case ARPHRD_TUNNEL:
	case ARPHRD_TUNNEL6:
	case ARPHRD_SIT:
	case ARPHRD_IPGRE:
	case ARPHRD_IP6GRE:
	case ARPHRD_VOID:
	case ARPHRD_NONE:
		return false;
	default:
		return true;
	}
}

TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb,
				     const struct tc_action *a,
				     struct tcf_result *res)
{
	struct tcf_sample *s = to_sample(a);
	struct psample_group *psample_group;
	struct psample_metadata md = {};
	int retval;

	tcf_lastuse_update(&s->tcf_tm);
	bstats_update(this_cpu_ptr(s->common.cpu_bstats), skb);
	retval = READ_ONCE(s->tcf_action);

	psample_group = rcu_dereference_bh(s->psample_group);

	/* randomly sample packets according to rate */
	if (psample_group && (get_random_u32_below(s->rate) == 0)) {
		if (!skb_at_tc_ingress(skb)) {
			md.in_ifindex = skb->skb_iif;
			md.out_ifindex = skb->dev->ifindex;
		} else {
			md.in_ifindex = skb->dev->ifindex;
		}

		/* on ingress, the mac header gets popped, so push it back */
		if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
			skb_push(skb, skb->mac_len);

		md.trunc_size = s->truncate ? s->trunc_size : skb->len;
		psample_sample_packet(psample_group, skb, s->rate, &md);

		if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
			skb_pull(skb, skb->mac_len);
	}

	return retval;
}

static void tcf_sample_stats_update(struct tc_action *a, u64 bytes, u64 packets,
				    u64 drops, u64 lastuse, bool hw)
{
	struct tcf_sample *s = to_sample(a);
	struct tcf_t *tm = &s->tcf_tm;

	tcf_action_update_stats(a, bytes, packets, drops, hw);
	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
}

static int tcf_sample_dump(struct sk_buff *skb, struct tc_action *a,
			   int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_sample *s = to_sample(a);
	struct tc_sample opt = {
		.index      = s->tcf_index,
		.refcnt     = refcount_read(&s->tcf_refcnt) - ref,
		.bindcnt    = atomic_read(&s->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&s->tcf_lock);
	opt.action = s->tcf_action;
	if (nla_put(skb, TCA_SAMPLE_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	tcf_tm_dump(&t, &s->tcf_tm);
	if (nla_put_64bit(skb, TCA_SAMPLE_TM, sizeof(t), &t, TCA_SAMPLE_PAD))
		goto nla_put_failure;

	if (nla_put_u32(skb, TCA_SAMPLE_RATE, s->rate))
		goto nla_put_failure;

	if (s->truncate)
		if (nla_put_u32(skb, TCA_SAMPLE_TRUNC_SIZE, s->trunc_size))
			goto nla_put_failure;

	if (nla_put_u32(skb, TCA_SAMPLE_PSAMPLE_GROUP, s->psample_group_num))
		goto nla_put_failure;
	spin_unlock_bh(&s->tcf_lock);

	return skb->len;

nla_put_failure:
	spin_unlock_bh(&s->tcf_lock);
	nlmsg_trim(skb, b);
	return -1;
}

static void tcf_psample_group_put(void *priv)
{
	struct psample_group *group = priv;

	psample_group_put(group);
}

static struct psample_group *
tcf_sample_get_group(const struct tc_action *a,
		     tc_action_priv_destructor *destructor)
{
	struct tcf_sample *s = to_sample(a);
	struct psample_group *group;

	group = rcu_dereference_protected(s->psample_group,
					  lockdep_is_held(&s->tcf_lock));
	if (group) {
		psample_group_take(group);
		*destructor = tcf_psample_group_put;
	}

	return group;
}

static void tcf_offload_sample_get_group(struct flow_action_entry *entry,
					 const struct tc_action *act)
{
	entry->sample.psample_group =
		act->ops->get_psample_group(act, &entry->destructor);
	entry->destructor_priv = entry->sample.psample_group;
}

static int tcf_sample_offload_act_setup(struct tc_action *act, void *entry_data,
					u32 *index_inc, bool bind,
					struct netlink_ext_ack *extack)
{
	if (bind) {
		struct flow_action_entry *entry = entry_data;

		entry->id = FLOW_ACTION_SAMPLE;
		entry->sample.trunc_size = tcf_sample_trunc_size(act);
		entry->sample.truncate = tcf_sample_truncate(act);
		entry->sample.rate = tcf_sample_rate(act);
		tcf_offload_sample_get_group(entry, act);
		*index_inc = 1;
	} else {
		struct flow_offload_action *fl_action = entry_data;

		fl_action->id = FLOW_ACTION_SAMPLE;
	}

	return 0;
}

static struct tc_action_ops act_sample_ops = {
	.kind	  = "sample",
	.id	  = TCA_ID_SAMPLE,
	.owner	  = THIS_MODULE,
	.act	  = tcf_sample_act,
	.stats_update = tcf_sample_stats_update,
	.dump	  = tcf_sample_dump,
	.init	  = tcf_sample_init,
	.cleanup  = tcf_sample_cleanup,
	.get_psample_group = tcf_sample_get_group,
	.offload_act_setup    = tcf_sample_offload_act_setup,
	.size	  = sizeof(struct tcf_sample),
};

static __net_init int sample_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, act_sample_ops.net_id);

	return tc_action_net_init(net, tn, &act_sample_ops);
}

static void __net_exit sample_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, act_sample_ops.net_id);
}

static struct pernet_operations sample_net_ops = {
	.init = sample_init_net,
	.exit_batch = sample_exit_net,
	.id   = &act_sample_ops.net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init sample_init_module(void)
{
	return tcf_register_action(&act_sample_ops, &sample_net_ops);
}

static void __exit sample_cleanup_module(void)
{
	tcf_unregister_action(&act_sample_ops, &sample_net_ops);
}

module_init(sample_init_module);
module_exit(sample_cleanup_module);

MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>");
MODULE_DESCRIPTION("Packet sampling action");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
5c5670fa YG	2	/*
	3	* net/sched/act_sample.c - Packet sampling tc action
	4	* Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
5c5670fa YG	5	*/
	6
	7	#include <linux/types.h>
	8	#include <linux/kernel.h>
	9	#include <linux/string.h>
	10	#include <linux/errno.h>
	11	#include <linux/skbuff.h>
	12	#include <linux/rtnetlink.h>
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/gfp.h>
	16	#include <net/net_namespace.h>
	17	#include <net/netlink.h>
	18	#include <net/pkt_sched.h>
	19	#include <linux/tc_act/tc_sample.h>
	20	#include <net/tc_act/tc_sample.h>
	21	#include <net/psample.h>
e8c87c64	22	#include <net/pkt_cls.h>
871cf386	23	#include <net/tc_wrapper.h>
5c5670fa YG	24
	25	#include <linux/if_arp.h>
	26
5c5670fa YG	27	static struct tc_action_ops act_sample_ops;
	28
	29	static const struct nla_policy sample_policy[TCA_SAMPLE_MAX + 1] = {
	30	[TCA_SAMPLE_PARMS] = { .len = sizeof(struct tc_sample) },
	31	[TCA_SAMPLE_RATE] = { .type = NLA_U32 },
	32	[TCA_SAMPLE_TRUNC_SIZE] = { .type = NLA_U32 },
	33	[TCA_SAMPLE_PSAMPLE_GROUP] = { .type = NLA_U32 },
	34	};
	35
	36	static int tcf_sample_init(struct net net, struct nlattr nla,
695176bf CW	37	struct nlattr est, struct tc_action *a,
695176bf CW	38	struct tcf_proto *tp,
abbb0d33	39	u32 flags, struct netlink_ext_ack *extack)
5c5670fa	40	{
acd0a7ab	41	struct tc_action_net *tn = net_generic(net, act_sample_ops.net_id);
695176bf	42	bool bind = flags & TCA_ACT_FLAGS_BIND;
5c5670fa YG	43	struct nlattr *tb[TCA_SAMPLE_MAX + 1];
5c5670fa YG	44	struct psample_group *psample_group;
7be8ef2c	45	u32 psample_group_num, rate, index;
e8c87c64	46	struct tcf_chain *goto_ch = NULL;
5c5670fa YG	47	struct tc_sample *parm;
	48	struct tcf_sample *s;
	49	bool exists = false;
0190c1d4	50	int ret, err;
5c5670fa YG	51
	52	if (!nla)
	53	return -EINVAL;
8cb08174 JB	54	ret = nla_parse_nested_deprecated(tb, TCA_SAMPLE_MAX, nla,
8cb08174 JB	55	sample_policy, NULL);
5c5670fa YG	56	if (ret < 0)
	57	return ret;
	58	if (!tb[TCA_SAMPLE_PARMS] \|\| !tb[TCA_SAMPLE_RATE] \|\|
	59	!tb[TCA_SAMPLE_PSAMPLE_GROUP])
	60	return -EINVAL;
	61
	62	parm = nla_data(tb[TCA_SAMPLE_PARMS]);
7be8ef2c DL	63	index = parm->index;
7be8ef2c DL	64	err = tcf_idr_check_alloc(tn, &index, a, bind);
0190c1d4 VB	65	if (err < 0)
	66	return err;
	67	exists = err;
5c5670fa YG	68	if (exists && bind)
	69	return 0;
	70
	71	if (!exists) {
7be8ef2c	72	ret = tcf_idr_create(tn, index, est, a,
40bd094d	73	&act_sample_ops, bind, true, flags);
0190c1d4	74	if (ret) {
7be8ef2c	75	tcf_idr_cleanup(tn, index);
5c5670fa	76	return ret;
0190c1d4	77	}
5c5670fa	78	ret = ACT_P_CREATED;
695176bf	79	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
65a206c0	80	tcf_idr_release(*a, bind);
4e8ddd7f	81	return -EEXIST;
5c5670fa	82	}
e8c87c64 DC	83	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	84	if (err < 0)
	85	goto release_idr;
5c5670fa	86
fae27081 DC	87	rate = nla_get_u32(tb[TCA_SAMPLE_RATE]);
	88	if (!rate) {
	89	NL_SET_ERR_MSG(extack, "invalid sample rate");
	90	err = -EINVAL;
	91	goto put_chain;
	92	}
653cd284 VB	93	psample_group_num = nla_get_u32(tb[TCA_SAMPLE_PSAMPLE_GROUP]);
653cd284 VB	94	psample_group = psample_group_get(net, psample_group_num);
cadb9c9f	95	if (!psample_group) {
e8c87c64 DC	96	err = -ENOMEM;
e8c87c64 DC	97	goto put_chain;
cadb9c9f	98	}
653cd284 VB	99
	100	s = to_sample(*a);
	101
	102	spin_lock_bh(&s->tcf_lock);
e8c87c64	103	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
fae27081	104	s->rate = rate;
653cd284	105	s->psample_group_num = psample_group_num;
445d3749 PM	106	psample_group = rcu_replace_pointer(s->psample_group, psample_group,
445d3749 PM	107	lockdep_is_held(&s->tcf_lock));
5c5670fa YG	108
	109	if (tb[TCA_SAMPLE_TRUNC_SIZE]) {
	110	s->truncate = true;
	111	s->trunc_size = nla_get_u32(tb[TCA_SAMPLE_TRUNC_SIZE]);
	112	}
653cd284	113	spin_unlock_bh(&s->tcf_lock);
dbf47a2a VB	114
	115	if (psample_group)
	116	psample_group_put(psample_group);
e8c87c64 DC	117	if (goto_ch)
e8c87c64 DC	118	tcf_chain_put_by_act(goto_ch);
5c5670fa	119
5c5670fa	120	return ret;
e8c87c64 DC	121	put_chain:
	122	if (goto_ch)
	123	tcf_chain_put_by_act(goto_ch);
	124	release_idr:
	125	tcf_idr_release(*a, bind);
	126	return err;
5c5670fa YG	127	}
5c5670fa YG	128
9a63b255	129	static void tcf_sample_cleanup(struct tc_action *a)
5c5670fa	130	{
90a6ec85	131	struct tcf_sample *s = to_sample(a);
5c5670fa YG	132	struct psample_group *psample_group;
5c5670fa YG	133
d7728495 VB	134	/* last reference to action, no need to lock */
d7728495 VB	135	psample_group = rcu_dereference_protected(s->psample_group, 1);
5c5670fa	136	RCU_INIT_POINTER(s->psample_group, NULL);
1f110e7c DC	137	if (psample_group)
1f110e7c DC	138	psample_group_put(psample_group);
5c5670fa YG	139	}
5c5670fa YG	140
5c5670fa YG	141	static bool tcf_sample_dev_ok_push(struct net_device *dev)
	142	{
	143	switch (dev->type) {
	144	case ARPHRD_TUNNEL:
	145	case ARPHRD_TUNNEL6:
	146	case ARPHRD_SIT:
	147	case ARPHRD_IPGRE:
92974a1d	148	case ARPHRD_IP6GRE:
5c5670fa YG	149	case ARPHRD_VOID:
	150	case ARPHRD_NONE:
	151	return false;
	152	default:
	153	return true;
	154	}
	155	}
	156
871cf386 PT	157	TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb,
	158	const struct tc_action *a,
	159	struct tcf_result *res)
5c5670fa YG	160	{
	161	struct tcf_sample *s = to_sample(a);
	162	struct psample_group *psample_group;
a03e99d3	163	struct psample_metadata md = {};
5c5670fa	164	int retval;
5c5670fa YG	165
5c5670fa YG	166	tcf_lastuse_update(&s->tcf_tm);
50dc9a85	167	bstats_update(this_cpu_ptr(s->common.cpu_bstats), skb);
5c5670fa YG	168	retval = READ_ONCE(s->tcf_action);
5c5670fa YG	169
7fd4b288	170	psample_group = rcu_dereference_bh(s->psample_group);
5c5670fa YG	171
5c5670fa YG	172	/* randomly sample packets according to rate */
8032bf12	173	if (psample_group && (get_random_u32_below(s->rate) == 0)) {
5c5670fa	174	if (!skb_at_tc_ingress(skb)) {
a03e99d3 IS	175	md.in_ifindex = skb->skb_iif;
a03e99d3 IS	176	md.out_ifindex = skb->dev->ifindex;
5c5670fa	177	} else {
a03e99d3	178	md.in_ifindex = skb->dev->ifindex;
5c5670fa YG	179	}
	180
	181	/* on ingress, the mac header gets popped, so push it back */
	182	if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
	183	skb_push(skb, skb->mac_len);
	184
a03e99d3 IS	185	md.trunc_size = s->truncate ? s->trunc_size : skb->len;
a03e99d3 IS	186	psample_sample_packet(psample_group, skb, s->rate, &md);
5c5670fa YG	187
	188	if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
	189	skb_pull(skb, skb->mac_len);
	190	}
	191
5c5670fa YG	192	return retval;
	193	}
	194
58c04397 IS	195	static void tcf_sample_stats_update(struct tc_action *a, u64 bytes, u64 packets,
	196	u64 drops, u64 lastuse, bool hw)
	197	{
	198	struct tcf_sample *s = to_sample(a);
	199	struct tcf_t *tm = &s->tcf_tm;
	200
	201	tcf_action_update_stats(a, bytes, packets, drops, hw);
	202	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
	203	}
	204
5c5670fa YG	205	static int tcf_sample_dump(struct sk_buff skb, struct tc_action a,
	206	int bind, int ref)
	207	{
	208	unsigned char *b = skb_tail_pointer(skb);
	209	struct tcf_sample *s = to_sample(a);
	210	struct tc_sample opt = {
	211	.index = s->tcf_index,
036bb443 VB	212	.refcnt = refcount_read(&s->tcf_refcnt) - ref,
036bb443 VB	213	.bindcnt = atomic_read(&s->tcf_bindcnt) - bind,
5c5670fa YG	214	};
	215	struct tcf_t t;
	216
653cd284	217	spin_lock_bh(&s->tcf_lock);
d7728495	218	opt.action = s->tcf_action;
5c5670fa YG	219	if (nla_put(skb, TCA_SAMPLE_PARMS, sizeof(opt), &opt))
	220	goto nla_put_failure;
	221
	222	tcf_tm_dump(&t, &s->tcf_tm);
	223	if (nla_put_64bit(skb, TCA_SAMPLE_TM, sizeof(t), &t, TCA_SAMPLE_PAD))
	224	goto nla_put_failure;
	225
	226	if (nla_put_u32(skb, TCA_SAMPLE_RATE, s->rate))
	227	goto nla_put_failure;
	228
	229	if (s->truncate)
	230	if (nla_put_u32(skb, TCA_SAMPLE_TRUNC_SIZE, s->trunc_size))
	231	goto nla_put_failure;
	232
	233	if (nla_put_u32(skb, TCA_SAMPLE_PSAMPLE_GROUP, s->psample_group_num))
	234	goto nla_put_failure;
653cd284	235	spin_unlock_bh(&s->tcf_lock);
d7728495	236
5c5670fa YG	237	return skb->len;
	238
	239	nla_put_failure:
653cd284	240	spin_unlock_bh(&s->tcf_lock);
5c5670fa YG	241	nlmsg_trim(skb, b);
	242	return -1;
	243	}
	244
4a5da47d VB	245	static void tcf_psample_group_put(void *priv)
	246	{
	247	struct psample_group *group = priv;
	248
	249	psample_group_put(group);
	250	}
	251
	252	static struct psample_group *
	253	tcf_sample_get_group(const struct tc_action *a,
	254	tc_action_priv_destructor *destructor)
	255	{
	256	struct tcf_sample *s = to_sample(a);
	257	struct psample_group *group;
	258
4a5da47d VB	259	group = rcu_dereference_protected(s->psample_group,
	260	lockdep_is_held(&s->tcf_lock));
	261	if (group) {
	262	psample_group_take(group);
	263	*destructor = tcf_psample_group_put;
	264	}
4a5da47d VB	265
	266	return group;
	267	}
	268
c54e1d92 BZ	269	static void tcf_offload_sample_get_group(struct flow_action_entry *entry,
	270	const struct tc_action *act)
	271	{
	272	entry->sample.psample_group =
	273	act->ops->get_psample_group(act, &entry->destructor);
	274	entry->destructor_priv = entry->sample.psample_group;
	275	}
	276
	277	static int tcf_sample_offload_act_setup(struct tc_action act, void entry_data,
c2ccf84e IS	278	u32 *index_inc, bool bind,
c2ccf84e IS	279	struct netlink_ext_ack *extack)
c54e1d92 BZ	280	{
	281	if (bind) {
	282	struct flow_action_entry *entry = entry_data;
	283
	284	entry->id = FLOW_ACTION_SAMPLE;
	285	entry->sample.trunc_size = tcf_sample_trunc_size(act);
	286	entry->sample.truncate = tcf_sample_truncate(act);
	287	entry->sample.rate = tcf_sample_rate(act);
	288	tcf_offload_sample_get_group(entry, act);
	289	*index_inc = 1;
	290	} else {
8cbfe939 BZ	291	struct flow_offload_action *fl_action = entry_data;
	292
	293	fl_action->id = FLOW_ACTION_SAMPLE;
c54e1d92 BZ	294	}
	295
	296	return 0;
	297	}
	298
5c5670fa YG	299	static struct tc_action_ops act_sample_ops = {
5c5670fa YG	300	.kind = "sample",
eddd2cf1	301	.id = TCA_ID_SAMPLE,
5c5670fa YG	302	.owner = THIS_MODULE,
5c5670fa YG	303	.act = tcf_sample_act,
58c04397	304	.stats_update = tcf_sample_stats_update,
5c5670fa YG	305	.dump = tcf_sample_dump,
	306	.init = tcf_sample_init,
	307	.cleanup = tcf_sample_cleanup,
4a5da47d	308	.get_psample_group = tcf_sample_get_group,
c54e1d92	309	.offload_act_setup = tcf_sample_offload_act_setup,
5c5670fa YG	310	.size = sizeof(struct tcf_sample),
	311	};
	312
	313	static __net_init int sample_init_net(struct net *net)
	314	{
acd0a7ab	315	struct tc_action_net *tn = net_generic(net, act_sample_ops.net_id);
5c5670fa	316
981471bd	317	return tc_action_net_init(net, tn, &act_sample_ops);
5c5670fa YG	318	}
5c5670fa YG	319
039af9c6	320	static void __net_exit sample_exit_net(struct list_head *net_list)
5c5670fa	321	{
acd0a7ab	322	tc_action_net_exit(net_list, act_sample_ops.net_id);
5c5670fa YG	323	}
	324
	325	static struct pernet_operations sample_net_ops = {
	326	.init = sample_init_net,
039af9c6	327	.exit_batch = sample_exit_net,
acd0a7ab	328	.id = &act_sample_ops.net_id,
5c5670fa YG	329	.size = sizeof(struct tc_action_net),
	330	};
	331
	332	static int __init sample_init_module(void)
	333	{
	334	return tcf_register_action(&act_sample_ops, &sample_net_ops);
	335	}
	336
	337	static void __exit sample_cleanup_module(void)
	338	{
	339	tcf_unregister_action(&act_sample_ops, &sample_net_ops);
	340	}
	341
	342	module_init(sample_init_module);
	343	module_exit(sample_cleanup_module);
	344
f1fd20c3	345	MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>");
5c5670fa YG	346	MODULE_DESCRIPTION("Packet sampling action");
5c5670fa YG	347	MODULE_LICENSE("GPL v2");