[people/ms/linux.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 <linux/if_arp.h>

static unsigned int sample_net_id;
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, sample_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;
	}
}

static 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 && (prandom_u32() % 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 int tcf_sample_walker(struct net *net, struct sk_buff *skb,
			     struct netlink_callback *cb, int type,
			     const struct tc_action_ops *ops,
			     struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, sample_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}

static int tcf_sample_search(struct net *net, struct tc_action **a, u32 index)
{
	struct tc_action_net *tn = net_generic(net, sample_net_id);

	return tcf_idr_search(tn, a, index);
}

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,
	.walk	  = tcf_sample_walker,
	.lookup	  = tcf_sample_search,
	.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, sample_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, sample_net_id);
}

static struct pernet_operations sample_net_ops = {
	.init = sample_init_net,
	.exit_batch = sample_exit_net,
	.id   = &sample_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>
5c5670fa YG	23
	24	#include <linux/if_arp.h>
	25
5c5670fa YG	26	static unsigned int sample_net_id;
	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 YG	40	{
5c5670fa YG	41	struct tc_action_net *tn = net_generic(net, sample_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
	157	static int tcf_sample_act(struct sk_buff skb, const struct tc_action a,
	158	struct tcf_result *res)
	159	{
	160	struct tcf_sample *s = to_sample(a);
	161	struct psample_group *psample_group;
a03e99d3	162	struct psample_metadata md = {};
5c5670fa	163	int retval;
5c5670fa YG	164
5c5670fa YG	165	tcf_lastuse_update(&s->tcf_tm);
50dc9a85	166	bstats_update(this_cpu_ptr(s->common.cpu_bstats), skb);
5c5670fa YG	167	retval = READ_ONCE(s->tcf_action);
5c5670fa YG	168
7fd4b288	169	psample_group = rcu_dereference_bh(s->psample_group);
5c5670fa YG	170
	171	/* randomly sample packets according to rate */
	172	if (psample_group && (prandom_u32() % s->rate == 0)) {
	173	if (!skb_at_tc_ingress(skb)) {
a03e99d3 IS	174	md.in_ifindex = skb->skb_iif;
a03e99d3 IS	175	md.out_ifindex = skb->dev->ifindex;
5c5670fa	176	} else {
a03e99d3	177	md.in_ifindex = skb->dev->ifindex;
5c5670fa YG	178	}
	179
	180	/* on ingress, the mac header gets popped, so push it back */
	181	if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
	182	skb_push(skb, skb->mac_len);
	183
a03e99d3 IS	184	md.trunc_size = s->truncate ? s->trunc_size : skb->len;
a03e99d3 IS	185	psample_sample_packet(psample_group, skb, s->rate, &md);
5c5670fa YG	186
	187	if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
	188	skb_pull(skb, skb->mac_len);
	189	}
	190
5c5670fa YG	191	return retval;
	192	}
	193
58c04397 IS	194	static void tcf_sample_stats_update(struct tc_action *a, u64 bytes, u64 packets,
	195	u64 drops, u64 lastuse, bool hw)
	196	{
	197	struct tcf_sample *s = to_sample(a);
	198	struct tcf_t *tm = &s->tcf_tm;
	199
	200	tcf_action_update_stats(a, bytes, packets, drops, hw);
	201	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
	202	}
	203
5c5670fa YG	204	static int tcf_sample_dump(struct sk_buff skb, struct tc_action a,
	205	int bind, int ref)
	206	{
	207	unsigned char *b = skb_tail_pointer(skb);
	208	struct tcf_sample *s = to_sample(a);
	209	struct tc_sample opt = {
	210	.index = s->tcf_index,
036bb443 VB	211	.refcnt = refcount_read(&s->tcf_refcnt) - ref,
036bb443 VB	212	.bindcnt = atomic_read(&s->tcf_bindcnt) - bind,
5c5670fa YG	213	};
	214	struct tcf_t t;
	215
653cd284	216	spin_lock_bh(&s->tcf_lock);
d7728495	217	opt.action = s->tcf_action;
5c5670fa YG	218	if (nla_put(skb, TCA_SAMPLE_PARMS, sizeof(opt), &opt))
	219	goto nla_put_failure;
	220
	221	tcf_tm_dump(&t, &s->tcf_tm);
	222	if (nla_put_64bit(skb, TCA_SAMPLE_TM, sizeof(t), &t, TCA_SAMPLE_PAD))
	223	goto nla_put_failure;
	224
	225	if (nla_put_u32(skb, TCA_SAMPLE_RATE, s->rate))
	226	goto nla_put_failure;
	227
	228	if (s->truncate)
	229	if (nla_put_u32(skb, TCA_SAMPLE_TRUNC_SIZE, s->trunc_size))
	230	goto nla_put_failure;
	231
	232	if (nla_put_u32(skb, TCA_SAMPLE_PSAMPLE_GROUP, s->psample_group_num))
	233	goto nla_put_failure;
653cd284	234	spin_unlock_bh(&s->tcf_lock);
d7728495	235
5c5670fa YG	236	return skb->len;
	237
	238	nla_put_failure:
653cd284	239	spin_unlock_bh(&s->tcf_lock);
5c5670fa YG	240	nlmsg_trim(skb, b);
	241	return -1;
	242	}
	243
	244	static int tcf_sample_walker(struct net net, struct sk_buff skb,
	245	struct netlink_callback *cb, int type,
41780105 AA	246	const struct tc_action_ops *ops,
41780105 AA	247	struct netlink_ext_ack *extack)
5c5670fa YG	248	{
	249	struct tc_action_net *tn = net_generic(net, sample_net_id);
	250
b3620145	251	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
5c5670fa YG	252	}
5c5670fa YG	253
f061b48c	254	static int tcf_sample_search(struct net net, struct tc_action *a, u32 index)
5c5670fa YG	255	{
	256	struct tc_action_net *tn = net_generic(net, sample_net_id);
	257
65a206c0	258	return tcf_idr_search(tn, a, index);
5c5670fa YG	259	}
5c5670fa YG	260
4a5da47d VB	261	static void tcf_psample_group_put(void *priv)
	262	{
	263	struct psample_group *group = priv;
	264
	265	psample_group_put(group);
	266	}
	267
	268	static struct psample_group *
	269	tcf_sample_get_group(const struct tc_action *a,
	270	tc_action_priv_destructor *destructor)
	271	{
	272	struct tcf_sample *s = to_sample(a);
	273	struct psample_group *group;
	274
4a5da47d VB	275	group = rcu_dereference_protected(s->psample_group,
	276	lockdep_is_held(&s->tcf_lock));
	277	if (group) {
	278	psample_group_take(group);
	279	*destructor = tcf_psample_group_put;
	280	}
4a5da47d VB	281
	282	return group;
	283	}
	284
c54e1d92 BZ	285	static void tcf_offload_sample_get_group(struct flow_action_entry *entry,
	286	const struct tc_action *act)
	287	{
	288	entry->sample.psample_group =
	289	act->ops->get_psample_group(act, &entry->destructor);
	290	entry->destructor_priv = entry->sample.psample_group;
	291	}
	292
	293	static int tcf_sample_offload_act_setup(struct tc_action act, void entry_data,
c2ccf84e IS	294	u32 *index_inc, bool bind,
c2ccf84e IS	295	struct netlink_ext_ack *extack)
c54e1d92 BZ	296	{
	297	if (bind) {
	298	struct flow_action_entry *entry = entry_data;
	299
	300	entry->id = FLOW_ACTION_SAMPLE;
	301	entry->sample.trunc_size = tcf_sample_trunc_size(act);
	302	entry->sample.truncate = tcf_sample_truncate(act);
	303	entry->sample.rate = tcf_sample_rate(act);
	304	tcf_offload_sample_get_group(entry, act);
	305	*index_inc = 1;
	306	} else {
8cbfe939 BZ	307	struct flow_offload_action *fl_action = entry_data;
	308
	309	fl_action->id = FLOW_ACTION_SAMPLE;
c54e1d92 BZ	310	}
	311
	312	return 0;
	313	}
	314
5c5670fa YG	315	static struct tc_action_ops act_sample_ops = {
5c5670fa YG	316	.kind = "sample",
eddd2cf1	317	.id = TCA_ID_SAMPLE,
5c5670fa YG	318	.owner = THIS_MODULE,
5c5670fa YG	319	.act = tcf_sample_act,
58c04397	320	.stats_update = tcf_sample_stats_update,
5c5670fa YG	321	.dump = tcf_sample_dump,
	322	.init = tcf_sample_init,
	323	.cleanup = tcf_sample_cleanup,
	324	.walk = tcf_sample_walker,
	325	.lookup = tcf_sample_search,
4a5da47d	326	.get_psample_group = tcf_sample_get_group,
c54e1d92	327	.offload_act_setup = tcf_sample_offload_act_setup,
5c5670fa YG	328	.size = sizeof(struct tcf_sample),
	329	};
	330
	331	static __net_init int sample_init_net(struct net *net)
	332	{
	333	struct tc_action_net *tn = net_generic(net, sample_net_id);
	334
981471bd	335	return tc_action_net_init(net, tn, &act_sample_ops);
5c5670fa YG	336	}
5c5670fa YG	337
039af9c6	338	static void __net_exit sample_exit_net(struct list_head *net_list)
5c5670fa	339	{
039af9c6	340	tc_action_net_exit(net_list, sample_net_id);
5c5670fa YG	341	}
	342
	343	static struct pernet_operations sample_net_ops = {
	344	.init = sample_init_net,
039af9c6	345	.exit_batch = sample_exit_net,
5c5670fa YG	346	.id = &sample_net_id,
	347	.size = sizeof(struct tc_action_net),
	348	};
	349
	350	static int __init sample_init_module(void)
	351	{
	352	return tcf_register_action(&act_sample_ops, &sample_net_ops);
	353	}
	354
	355	static void __exit sample_cleanup_module(void)
	356	{
	357	tcf_unregister_action(&act_sample_ops, &sample_net_ops);
	358	}
	359
	360	module_init(sample_init_module);
	361	module_exit(sample_cleanup_module);
	362
f1fd20c3	363	MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>");
5c5670fa YG	364	MODULE_DESCRIPTION("Packet sampling action");
5c5670fa YG	365	MODULE_LICENSE("GPL v2");