devlink: push trap related code into separate file

Cut out another chunk from leftover.c and put trap related code
into a separate file.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20230828061657.300667-11-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 1861 insertions, 0 deletions

diff --git a/net/devlink/trap.c b/net/devlink/trap.c
new file mode 100644
index 000000000000..c26bf9b29bca
--- /dev/null
+++ b/net/devlink/trap.c
@@ -0,0 +1,1861 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
+ */
+
+#include <trace/events/devlink.h>
+
+#include "devl_internal.h"
+
+struct devlink_stats {
+	u64_stats_t rx_bytes;
+	u64_stats_t rx_packets;
+	struct u64_stats_sync syncp;
+};
+
+/**
+ * struct devlink_trap_policer_item - Packet trap policer attributes.
+ * @policer: Immutable packet trap policer attributes.
+ * @rate: Rate in packets / sec.
+ * @burst: Burst size in packets.
+ * @list: trap_policer_list member.
+ *
+ * Describes packet trap policer attributes. Created by devlink during trap
+ * policer registration.
+ */
+struct devlink_trap_policer_item {
+	const struct devlink_trap_policer *policer;
+	u64 rate;
+	u64 burst;
+	struct list_head list;
+};
+
+/**
+ * struct devlink_trap_group_item - Packet trap group attributes.
+ * @group: Immutable packet trap group attributes.
+ * @policer_item: Associated policer item. Can be NULL.
+ * @list: trap_group_list member.
+ * @stats: Trap group statistics.
+ *
+ * Describes packet trap group attributes. Created by devlink during trap
+ * group registration.
+ */
+struct devlink_trap_group_item {
+	const struct devlink_trap_group *group;
+	struct devlink_trap_policer_item *policer_item;
+	struct list_head list;
+	struct devlink_stats __percpu *stats;
+};
+
+/**
+ * struct devlink_trap_item - Packet trap attributes.
+ * @trap: Immutable packet trap attributes.
+ * @group_item: Associated group item.
+ * @list: trap_list member.
+ * @action: Trap action.
+ * @stats: Trap statistics.
+ * @priv: Driver private information.
+ *
+ * Describes both mutable and immutable packet trap attributes. Created by
+ * devlink during trap registration and used for all trap related operations.
+ */
+struct devlink_trap_item {
+	const struct devlink_trap *trap;
+	struct devlink_trap_group_item *group_item;
+	struct list_head list;
+	enum devlink_trap_action action;
+	struct devlink_stats __percpu *stats;
+	void *priv;
+};
+
+static struct devlink_trap_policer_item *
+devlink_trap_policer_item_lookup(struct devlink *devlink, u32 id)
+{
+	struct devlink_trap_policer_item *policer_item;
+
+	list_for_each_entry(policer_item, &devlink->trap_policer_list, list) {
+		if (policer_item->policer->id == id)
+			return policer_item;
+	}
+
+	return NULL;
+}
+
+static struct devlink_trap_item *
+devlink_trap_item_lookup(struct devlink *devlink, const char *name)
+{
+	struct devlink_trap_item *trap_item;
+
+	list_for_each_entry(trap_item, &devlink->trap_list, list) {
+		if (!strcmp(trap_item->trap->name, name))
+			return trap_item;
+	}
+
+	return NULL;
+}
+
+static struct devlink_trap_item *
+devlink_trap_item_get_from_info(struct devlink *devlink,
+				struct genl_info *info)
+{
+	struct nlattr *attr;
+
+	if (!info->attrs[DEVLINK_ATTR_TRAP_NAME])
+		return NULL;
+	attr = info->attrs[DEVLINK_ATTR_TRAP_NAME];
+
+	return devlink_trap_item_lookup(devlink, nla_data(attr));
+}
+
+static int
+devlink_trap_action_get_from_info(struct genl_info *info,
+				  enum devlink_trap_action *p_trap_action)
+{
+	u8 val;
+
+	val = nla_get_u8(info->attrs[DEVLINK_ATTR_TRAP_ACTION]);
+	switch (val) {
+	case DEVLINK_TRAP_ACTION_DROP:
+	case DEVLINK_TRAP_ACTION_TRAP:
+	case DEVLINK_TRAP_ACTION_MIRROR:
+		*p_trap_action = val;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int devlink_trap_metadata_put(struct sk_buff *msg,
+				     const struct devlink_trap *trap)
+{
+	struct nlattr *attr;
+
+	attr = nla_nest_start(msg, DEVLINK_ATTR_TRAP_METADATA);
+	if (!attr)
+		return -EMSGSIZE;
+
+	if ((trap->metadata_cap & DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT) &&
+	    nla_put_flag(msg, DEVLINK_ATTR_TRAP_METADATA_TYPE_IN_PORT))
+		goto nla_put_failure;
+	if ((trap->metadata_cap & DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE) &&
+	    nla_put_flag(msg, DEVLINK_ATTR_TRAP_METADATA_TYPE_FA_COOKIE))
+		goto nla_put_failure;
+
+	nla_nest_end(msg, attr);
+
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(msg, attr);
+	return -EMSGSIZE;
+}
+
+static void devlink_trap_stats_read(struct devlink_stats __percpu *trap_stats,
+				    struct devlink_stats *stats)
+{
+	int i;
+
+	memset(stats, 0, sizeof(*stats));
+	for_each_possible_cpu(i) {
+		struct devlink_stats *cpu_stats;
+		u64 rx_packets, rx_bytes;
+		unsigned int start;
+
+		cpu_stats = per_cpu_ptr(trap_stats, i);
+		do {
+			start = u64_stats_fetch_begin(&cpu_stats->syncp);
+			rx_packets = u64_stats_read(&cpu_stats->rx_packets);
+			rx_bytes = u64_stats_read(&cpu_stats->rx_bytes);
+		} while (u64_stats_fetch_retry(&cpu_stats->syncp, start));
+
+		u64_stats_add(&stats->rx_packets, rx_packets);
+		u64_stats_add(&stats->rx_bytes, rx_bytes);
+	}
+}
+
+static int
+devlink_trap_group_stats_put(struct sk_buff *msg,
+			     struct devlink_stats __percpu *trap_stats)
+{
+	struct devlink_stats stats;
+	struct nlattr *attr;
+
+	devlink_trap_stats_read(trap_stats, &stats);
+
+	attr = nla_nest_start(msg, DEVLINK_ATTR_STATS);
+	if (!attr)
+		return -EMSGSIZE;
+
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_PACKETS,
+			      u64_stats_read(&stats.rx_packets),
+			      DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_BYTES,
+			      u64_stats_read(&stats.rx_bytes),
+			      DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+	nla_nest_end(msg, attr);
+
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(msg, attr);
+	return -EMSGSIZE;
+}
+
+static int devlink_trap_stats_put(struct sk_buff *msg, struct devlink *devlink,
+				  const struct devlink_trap_item *trap_item)
+{
+	struct devlink_stats stats;
+	struct nlattr *attr;
+	u64 drops = 0;
+	int err;
+
+	if (devlink->ops->trap_drop_counter_get) {
+		err = devlink->ops->trap_drop_counter_get(devlink,
+							  trap_item->trap,
+							  &drops);
+		if (err)
+			return err;
+	}
+
+	devlink_trap_stats_read(trap_item->stats, &stats);
+
+	attr = nla_nest_start(msg, DEVLINK_ATTR_STATS);
+	if (!attr)
+		return -EMSGSIZE;
+
+	if (devlink->ops->trap_drop_counter_get &&
+	    nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_DROPPED, drops,
+			      DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_PACKETS,
+			      u64_stats_read(&stats.rx_packets),
+			      DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_BYTES,
+			      u64_stats_read(&stats.rx_bytes),
+			      DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+	nla_nest_end(msg, attr);
+
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(msg, attr);
+	return -EMSGSIZE;
+}
+
+static int devlink_nl_trap_fill(struct sk_buff *msg, struct devlink *devlink,
+				const struct devlink_trap_item *trap_item,
+				enum devlink_command cmd, u32 portid, u32 seq,
+				int flags)
+{
+	struct devlink_trap_group_item *group_item = trap_item->group_item;
+	void *hdr;
+	int err;
+
+	hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	if (devlink_nl_put_handle(msg, devlink))
+		goto nla_put_failure;
+
+	if (nla_put_string(msg, DEVLINK_ATTR_TRAP_GROUP_NAME,
+			   group_item->group->name))
+		goto nla_put_failure;
+
+	if (nla_put_string(msg, DEVLINK_ATTR_TRAP_NAME, trap_item->trap->name))
+		goto nla_put_failure;
+
+	if (nla_put_u8(msg, DEVLINK_ATTR_TRAP_TYPE, trap_item->trap->type))
+		goto nla_put_failure;
+
+	if (trap_item->trap->generic &&
+	    nla_put_flag(msg, DEVLINK_ATTR_TRAP_GENERIC))
+		goto nla_put_failure;
+
+	if (nla_put_u8(msg, DEVLINK_ATTR_TRAP_ACTION, trap_item->action))
+		goto nla_put_failure;
+
+	err = devlink_trap_metadata_put(msg, trap_item->trap);
+	if (err)
+		goto nla_put_failure;
+
+	err = devlink_trap_stats_put(msg, devlink, trap_item);
+	if (err)
+		goto nla_put_failure;
+
+	genlmsg_end(msg, hdr);
+
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	return -EMSGSIZE;
+}
+
+int devlink_nl_trap_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	struct netlink_ext_ack *extack = info->extack;
+	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_trap_item *trap_item;
+	struct sk_buff *msg;
+	int err;
+
+	if (list_empty(&devlink->trap_list))
+		return -EOPNOTSUPP;
+
+	trap_item = devlink_trap_item_get_from_info(devlink, info);
+	if (!trap_item) {
+		NL_SET_ERR_MSG(extack, "Device did not register this trap");
+		return -ENOENT;
+	}
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	err = devlink_nl_trap_fill(msg, devlink, trap_item,
+				   DEVLINK_CMD_TRAP_NEW, info->snd_portid,
+				   info->snd_seq, 0);
+	if (err)
+		goto err_trap_fill;
+
+	return genlmsg_reply(msg, info);
+
+err_trap_fill:
+	nlmsg_free(msg);
+	return err;
+}
+
+static int devlink_nl_trap_get_dump_one(struct sk_buff *msg,
+					struct devlink *devlink,
+					struct netlink_callback *cb, int flags)
+{
+	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
+	struct devlink_trap_item *trap_item;
+	int idx = 0;
+	int err = 0;
+
+	list_for_each_entry(trap_item, &devlink->trap_list, list) {
+		if (idx < state->idx) {
+			idx++;
+			continue;
+		}
+		err = devlink_nl_trap_fill(msg, devlink, trap_item,
+					   DEVLINK_CMD_TRAP_NEW,
+					   NETLINK_CB(cb->skb).portid,
+					   cb->nlh->nlmsg_seq, flags);
+		if (err) {
+			state->idx = idx;
+			break;
+		}
+		idx++;
+	}
+
+	return err;
+}
+
+int devlink_nl_trap_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	return devlink_nl_dumpit(skb, cb, devlink_nl_trap_get_dump_one);
+}
+
+static int __devlink_trap_action_set(struct devlink *devlink,
+				     struct devlink_trap_item *trap_item,
+				     enum devlink_trap_action trap_action,
+				     struct netlink_ext_ack *extack)
+{
+	int err;
+
+	if (trap_item->action != trap_action &&
+	    trap_item->trap->type != DEVLINK_TRAP_TYPE_DROP) {
+		NL_SET_ERR_MSG(extack, "Cannot change action of non-drop traps. Skipping");
+		return 0;
+	}
+
+	err = devlink->ops->trap_action_set(devlink, trap_item->trap,
+					    trap_action, extack);
+	if (err)
+		return err;
+
+	trap_item->action = trap_action;
+
+	return 0;
+}
+
+static int devlink_trap_action_set(struct devlink *devlink,
+				   struct devlink_trap_item *trap_item,
+				   struct genl_info *info)
+{
+	enum devlink_trap_action trap_action;
+	int err;
+
+	if (!info->attrs[DEVLINK_ATTR_TRAP_ACTION])
+		return 0;
+
+	err = devlink_trap_action_get_from_info(info, &trap_action);
+	if (err) {
+		NL_SET_ERR_MSG(info->extack, "Invalid trap action");
+		return -EINVAL;
+	}
+
+	return __devlink_trap_action_set(devlink, trap_item, trap_action,
+					 info->extack);
+}
+
+int devlink_nl_cmd_trap_set_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	struct netlink_ext_ack *extack = info->extack;
+	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_trap_item *trap_item;
+
+	if (list_empty(&devlink->trap_list))
+		return -EOPNOTSUPP;
+
+	trap_item = devlink_trap_item_get_from_info(devlink, info);
+	if (!trap_item) {
+		NL_SET_ERR_MSG(extack, "Device did not register this trap");
+		return -ENOENT;
+	}
+
+	return devlink_trap_action_set(devlink, trap_item, info);
+}
+
+static struct devlink_trap_group_item *
+devlink_trap_group_item_lookup(struct devlink *devlink, const char *name)
+{
+	struct devlink_trap_group_item *group_item;
+
+	list_for_each_entry(group_item, &devlink->trap_group_list, list) {
+		if (!strcmp(group_item->group->name, name))
+			return group_item;
+	}
+
+	return NULL;
+}
+
+static struct devlink_trap_group_item *
+devlink_trap_group_item_lookup_by_id(struct devlink *devlink, u16 id)
+{
+	struct devlink_trap_group_item *group_item;
+
+	list_for_each_entry(group_item, &devlink->trap_group_list, list) {
+		if (group_item->group->id == id)
+			return group_item;
+	}
+
+	return NULL;
+}
+
+static struct devlink_trap_group_item *
+devlink_trap_group_item_get_from_info(struct devlink *devlink,
+				      struct genl_info *info)
+{
+	char *name;
+
+	if (!info->attrs[DEVLINK_ATTR_TRAP_GROUP_NAME])
+		return NULL;
+	name = nla_data(info->attrs[DEVLINK_ATTR_TRAP_GROUP_NAME]);
+
+	return devlink_trap_group_item_lookup(devlink, name);
+}
+
+static int
+devlink_nl_trap_group_fill(struct sk_buff *msg, struct devlink *devlink,
+			   const struct devlink_trap_group_item *group_item,
+			   enum devlink_command cmd, u32 portid, u32 seq,
+			   int flags)
+{
+	void *hdr;
+	int err;
+
+	hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	if (devlink_nl_put_handle(msg, devlink))
+		goto nla_put_failure;
+
+	if (nla_put_string(msg, DEVLINK_ATTR_TRAP_GROUP_NAME,
+			   group_item->group->name))
+		goto nla_put_failure;
+
+	if (group_item->group->generic &&
+	    nla_put_flag(msg, DEVLINK_ATTR_TRAP_GENERIC))
+		goto nla_put_failure;
+
+	if (group_item->policer_item &&
+	    nla_put_u32(msg, DEVLINK_ATTR_TRAP_POLICER_ID,
+			group_item->policer_item->policer->id))
+		goto nla_put_failure;
+
+	err = devlink_trap_group_stats_put(msg, group_item->stats);
+	if (err)
+		goto nla_put_failure;
+
+	genlmsg_end(msg, hdr);
+
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	return -EMSGSIZE;
+}
+
+int devlink_nl_trap_group_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	struct netlink_ext_ack *extack = info->extack;
+	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_trap_group_item *group_item;
+	struct sk_buff *msg;
+	int err;
+
+	if (list_empty(&devlink->trap_group_list))
+		return -EOPNOTSUPP;
+
+	group_item = devlink_trap_group_item_get_from_info(devlink, info);
+	if (!group_item) {
+		NL_SET_ERR_MSG(extack, "Device did not register this trap group");
+		return -ENOENT;
+	}
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	err = devlink_nl_trap_group_fill(msg, devlink, group_item,
+					 DEVLINK_CMD_TRAP_GROUP_NEW,
+					 info->snd_portid, info->snd_seq, 0);
+	if (err)
+		goto err_trap_group_fill;
+
+	return genlmsg_reply(msg, info);
+
+err_trap_group_fill:
+	nlmsg_free(msg);
+	return err;
+}
+
+static int devlink_nl_trap_group_get_dump_one(struct sk_buff *msg,
+					      struct devlink *devlink,
+					      struct netlink_callback *cb,
+					      int flags)
+{
+	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
+	struct devlink_trap_group_item *group_item;
+	int idx = 0;
+	int err = 0;
+
+	list_for_each_entry(group_item, &devlink->trap_group_list, list) {
+		if (idx < state->idx) {
+			idx++;
+			continue;
+		}
+		err = devlink_nl_trap_group_fill(msg, devlink, group_item,
+						 DEVLINK_CMD_TRAP_GROUP_NEW,
+						 NETLINK_CB(cb->skb).portid,
+						 cb->nlh->nlmsg_seq, flags);
+		if (err) {
+			state->idx = idx;
+			break;
+		}
+		idx++;
+	}
+
+	return err;
+}
+
+int devlink_nl_trap_group_get_dumpit(struct sk_buff *skb,
+				     struct netlink_callback *cb)
+{
+	return devlink_nl_dumpit(skb, cb, devlink_nl_trap_group_get_dump_one);
+}
+
+static int
+__devlink_trap_group_action_set(struct devlink *devlink,
+				struct devlink_trap_group_item *group_item,
+				enum devlink_trap_action trap_action,
+				struct netlink_ext_ack *extack)
+{
+	const char *group_name = group_item->group->name;
+	struct devlink_trap_item *trap_item;
+	int err;
+
+	if (devlink->ops->trap_group_action_set) {
+		err = devlink->ops->trap_group_action_set(devlink, group_item->group,
+							  trap_action, extack);
+		if (err)
+			return err;
+
+		list_for_each_entry(trap_item, &devlink->trap_list, list) {
+			if (strcmp(trap_item->group_item->group->name, group_name))
+				continue;
+			if (trap_item->action != trap_action &&
+			    trap_item->trap->type != DEVLINK_TRAP_TYPE_DROP)
+				continue;
+			trap_item->action = trap_action;
+		}
+
+		return 0;
+	}
+
+	list_for_each_entry(trap_item, &devlink->trap_list, list) {
+		if (strcmp(trap_item->group_item->group->name, group_name))
+			continue;
+		err = __devlink_trap_action_set(devlink, trap_item,
+						trap_action, extack);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int
+devlink_trap_group_action_set(struct devlink *devlink,
+			      struct devlink_trap_group_item *group_item,
+			      struct genl_info *info, bool *p_modified)
+{
+	enum devlink_trap_action trap_action;
+	int err;
+
+	if (!info->attrs[DEVLINK_ATTR_TRAP_ACTION])
+		return 0;
+
+	err = devlink_trap_action_get_from_info(info, &trap_action);
+	if (err) {
+		NL_SET_ERR_MSG(info->extack, "Invalid trap action");
+		return -EINVAL;
+	}
+
+	err = __devlink_trap_group_action_set(devlink, group_item, trap_action,
+					      info->extack);
+	if (err)
+		return err;
+
+	*p_modified = true;
+
+	return 0;
+}
+
+static int devlink_trap_group_set(struct devlink *devlink,
+				  struct devlink_trap_group_item *group_item,
+				  struct genl_info *info)
+{
+	struct devlink_trap_policer_item *policer_item;
+	struct netlink_ext_ack *extack = info->extack;
+	const struct devlink_trap_policer *policer;
+	struct nlattr **attrs = info->attrs;
+	u32 policer_id;
+	int err;
+
+	if (!attrs[DEVLINK_ATTR_TRAP_POLICER_ID])
+		return 0;
+
+	if (!devlink->ops->trap_group_set)
+		return -EOPNOTSUPP;
+
+	policer_id = nla_get_u32(attrs[DEVLINK_ATTR_TRAP_POLICER_ID]);
+	policer_item = devlink_trap_policer_item_lookup(devlink, policer_id);
+	if (policer_id && !policer_item) {
+		NL_SET_ERR_MSG(extack, "Device did not register this trap policer");
+		return -ENOENT;
+	}
+	policer = policer_item ? policer_item->policer : NULL;
+
+	err = devlink->ops->trap_group_set(devlink, group_item->group, policer,
+					   extack);
+	if (err)
+		return err;
+
+	group_item->policer_item = policer_item;
+
+	return 0;
+}
+
+int devlink_nl_cmd_trap_group_set_doit(struct sk_buff *skb,
+				       struct genl_info *info)
+{
+	struct netlink_ext_ack *extack = info->extack;
+	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_trap_group_item *group_item;
+	bool modified = false;
+	int err;
+
+	if (list_empty(&devlink->trap_group_list))
+		return -EOPNOTSUPP;
+
+	group_item = devlink_trap_group_item_get_from_info(devlink, info);
+	if (!group_item) {
+		NL_SET_ERR_MSG(extack, "Device did not register this trap group");
+		return -ENOENT;
+	}
+
+	err = devlink_trap_group_action_set(devlink, group_item, info,
+					    &modified);
+	if (err)
+		return err;
+
+	err = devlink_trap_group_set(devlink, group_item, info);
+	if (err)
+		goto err_trap_group_set;
+
+	return 0;
+
+err_trap_group_set:
+	if (modified)
+		NL_SET_ERR_MSG(extack, "Trap group set failed, but some changes were committed already");
+	return err;
+}
+
+static struct devlink_trap_policer_item *
+devlink_trap_policer_item_get_from_info(struct devlink *devlink,
+					struct genl_info *info)
+{
+	u32 id;
+
+	if (!info->attrs[DEVLINK_ATTR_TRAP_POLICER_ID])
+		return NULL;
+	id = nla_get_u32(info->attrs[DEVLINK_ATTR_TRAP_POLICER_ID]);
+
+	return devlink_trap_policer_item_lookup(devlink, id);
+}
+
+static int
+devlink_trap_policer_stats_put(struct sk_buff *msg, struct devlink *devlink,
+			       const struct devlink_trap_policer *policer)
+{
+	struct nlattr *attr;
+	u64 drops;
+	int err;
+
+	if (!devlink->ops->trap_policer_counter_get)
+		return 0;
+
+	err = devlink->ops->trap_policer_counter_get(devlink, policer, &drops);
+	if (err)
+		return err;
+
+	attr = nla_nest_start(msg, DEVLINK_ATTR_STATS);
+	if (!attr)
+		return -EMSGSIZE;
+
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_DROPPED, drops,
+			      DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+	nla_nest_end(msg, attr);
+
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(msg, attr);
+	return -EMSGSIZE;
+}
+
+static int
+devlink_nl_trap_policer_fill(struct sk_buff *msg, struct devlink *devlink,
+			     const struct devlink_trap_policer_item *policer_item,
+			     enum devlink_command cmd, u32 portid, u32 seq,
+			     int flags)
+{
+	void *hdr;
+	int err;
+
+	hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	if (devlink_nl_put_handle(msg, devlink))
+		goto nla_put_failure;
+
+	if (nla_put_u32(msg, DEVLINK_ATTR_TRAP_POLICER_ID,
+			policer_item->policer->id))
+		goto nla_put_failure;
+
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_TRAP_POLICER_RATE,
+			      policer_item->rate, DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_TRAP_POLICER_BURST,
+			      policer_item->burst, DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+	err = devlink_trap_policer_stats_put(msg, devlink,
+					     policer_item->policer);
+	if (err)
+		goto nla_put_failure;
+
+	genlmsg_end(msg, hdr);
+
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	return -EMSGSIZE;
+}
+
+int devlink_nl_trap_policer_get_doit(struct sk_buff *skb,
+				     struct genl_info *info)
+{
+	struct devlink_trap_policer_item *policer_item;
+	struct netlink_ext_ack *extack = info->extack;
+	struct devlink *devlink = info->user_ptr[0];
+	struct sk_buff *msg;
+	int err;
+
+	if (list_empty(&devlink->trap_policer_list))
+		return -EOPNOTSUPP;
+
+	policer_item = devlink_trap_policer_item_get_from_info(devlink, info);
+	if (!policer_item) {
+		NL_SET_ERR_MSG(extack, "Device did not register this trap policer");
+		return -ENOENT;
+	}
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	err = devlink_nl_trap_policer_fill(msg, devlink, policer_item,
+					   DEVLINK_CMD_TRAP_POLICER_NEW,
+					   info->snd_portid, info->snd_seq, 0);
+	if (err)
+		goto err_trap_policer_fill;
+
+	return genlmsg_reply(msg, info);
+
+err_trap_policer_fill:
+	nlmsg_free(msg);
+	return err;
+}
+
+static int devlink_nl_trap_policer_get_dump_one(struct sk_buff *msg,
+						struct devlink *devlink,
+						struct netlink_callback *cb,
+						int flags)
+{
+	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
+	struct devlink_trap_policer_item *policer_item;
+	int idx = 0;
+	int err = 0;
+
+	list_for_each_entry(policer_item, &devlink->trap_policer_list, list) {
+		if (idx < state->idx) {
+			idx++;
+			continue;
+		}
+		err = devlink_nl_trap_policer_fill(msg, devlink, policer_item,
+						   DEVLINK_CMD_TRAP_POLICER_NEW,
+						   NETLINK_CB(cb->skb).portid,
+						   cb->nlh->nlmsg_seq, flags);
+		if (err) {
+			state->idx = idx;
+			break;
+		}
+		idx++;
+	}
+
+	return err;
+}
+
+int devlink_nl_trap_policer_get_dumpit(struct sk_buff *skb,
+				       struct netlink_callback *cb)
+{
+	return devlink_nl_dumpit(skb, cb, devlink_nl_trap_policer_get_dump_one);
+}
+
+static int
+devlink_trap_policer_set(struct devlink *devlink,
+			 struct devlink_trap_policer_item *policer_item,
+			 struct genl_info *info)
+{
+	struct netlink_ext_ack *extack = info->extack;
+	struct nlattr **attrs = info->attrs;
+	u64 rate, burst;
+	int err;
+
+	rate = policer_item->rate;
+	burst = policer_item->burst;
+
+	if (attrs[DEVLINK_ATTR_TRAP_POLICER_RATE])
+		rate = nla_get_u64(attrs[DEVLINK_ATTR_TRAP_POLICER_RATE]);
+
+	if (attrs[DEVLINK_ATTR_TRAP_POLICER_BURST])
+		burst = nla_get_u64(attrs[DEVLINK_ATTR_TRAP_POLICER_BURST]);
+
+	if (rate < policer_item->policer->min_rate) {
+		NL_SET_ERR_MSG(extack, "Policer rate lower than limit");
+		return -EINVAL;
+	}
+
+	if (rate > policer_item->policer->max_rate) {
+		NL_SET_ERR_MSG(extack, "Policer rate higher than limit");
+		return -EINVAL;
+	}
+
+	if (burst < policer_item->policer->min_burst) {
+		NL_SET_ERR_MSG(extack, "Policer burst size lower than limit");
+		return -EINVAL;
+	}
+
+	if (burst > policer_item->policer->max_burst) {
+		NL_SET_ERR_MSG(extack, "Policer burst size higher than limit");
+		return -EINVAL;
+	}
+
+	err = devlink->ops->trap_policer_set(devlink, policer_item->policer,
+					     rate, burst, info->extack);
+	if (err)
+		return err;
+
+	policer_item->rate = rate;
+	policer_item->burst = burst;
+
+	return 0;
+}
+
+int devlink_nl_cmd_trap_policer_set_doit(struct sk_buff *skb,
+					 struct genl_info *info)
+{
+	struct devlink_trap_policer_item *policer_item;
+	struct netlink_ext_ack *extack = info->extack;
+	struct devlink *devlink = info->user_ptr[0];
+
+	if (list_empty(&devlink->trap_policer_list))
+		return -EOPNOTSUPP;
+
+	if (!devlink->ops->trap_policer_set)
+		return -EOPNOTSUPP;
+
+	policer_item = devlink_trap_policer_item_get_from_info(devlink, info);
+	if (!policer_item) {
+		NL_SET_ERR_MSG(extack, "Device did not register this trap policer");
+		return -ENOENT;
+	}
+
+	return devlink_trap_policer_set(devlink, policer_item, info);
+}
+
+#define DEVLINK_TRAP(_id, _type)					      \
+	{								      \
+		.type = DEVLINK_TRAP_TYPE_##_type,			      \
+		.id = DEVLINK_TRAP_GENERIC_ID_##_id,			      \
+		.name = DEVLINK_TRAP_GENERIC_NAME_##_id,		      \
+	}
+
+static const struct devlink_trap devlink_trap_generic[] = {
+	DEVLINK_TRAP(SMAC_MC, DROP),
+	DEVLINK_TRAP(VLAN_TAG_MISMATCH, DROP),
+	DEVLINK_TRAP(INGRESS_VLAN_FILTER, DROP),
+	DEVLINK_TRAP(INGRESS_STP_FILTER, DROP),
+	DEVLINK_TRAP(EMPTY_TX_LIST, DROP),
+	DEVLINK_TRAP(PORT_LOOPBACK_FILTER, DROP),
+	DEVLINK_TRAP(BLACKHOLE_ROUTE, DROP),
+	DEVLINK_TRAP(TTL_ERROR, EXCEPTION),
+	DEVLINK_TRAP(TAIL_DROP, DROP),
+	DEVLINK_TRAP(NON_IP_PACKET, DROP),
+	DEVLINK_TRAP(UC_DIP_MC_DMAC, DROP),
+	DEVLINK_TRAP(DIP_LB, DROP),
+	DEVLINK_TRAP(SIP_MC, DROP),
+	DEVLINK_TRAP(SIP_LB, DROP),
+	DEVLINK_TRAP(CORRUPTED_IP_HDR, DROP),
+	DEVLINK_TRAP(IPV4_SIP_BC, DROP),
+	DEVLINK_TRAP(IPV6_MC_DIP_RESERVED_SCOPE, DROP),
+	DEVLINK_TRAP(IPV6_MC_DIP_INTERFACE_LOCAL_SCOPE, DROP),
+	DEVLINK_TRAP(MTU_ERROR, EXCEPTION),
+	DEVLINK_TRAP(UNRESOLVED_NEIGH, EXCEPTION),
+	DEVLINK_TRAP(RPF, EXCEPTION),
+	DEVLINK_TRAP(REJECT_ROUTE, EXCEPTION),
+	DEVLINK_TRAP(IPV4_LPM_UNICAST_MISS, EXCEPTION),
+	DEVLINK_TRAP(IPV6_LPM_UNICAST_MISS, EXCEPTION),
+	DEVLINK_TRAP(NON_ROUTABLE, DROP),
+	DEVLINK_TRAP(DECAP_ERROR, EXCEPTION),
+	DEVLINK_TRAP(OVERLAY_SMAC_MC, DROP),
+	DEVLINK_TRAP(INGRESS_FLOW_ACTION_DROP, DROP),
+	DEVLINK_TRAP(EGRESS_FLOW_ACTION_DROP, DROP),
+	DEVLINK_TRAP(STP, CONTROL),
+	DEVLINK_TRAP(LACP, CONTROL),
+	DEVLINK_TRAP(LLDP, CONTROL),
+	DEVLINK_TRAP(IGMP_QUERY, CONTROL),
+	DEVLINK_TRAP(IGMP_V1_REPORT, CONTROL),
+	DEVLINK_TRAP(IGMP_V2_REPORT, CONTROL),
+	DEVLINK_TRAP(IGMP_V3_REPORT, CONTROL),
+	DEVLINK_TRAP(IGMP_V2_LEAVE, CONTROL),
+	DEVLINK_TRAP(MLD_QUERY, CONTROL),
+	DEVLINK_TRAP(MLD_V1_REPORT, CONTROL),
+	DEVLINK_TRAP(MLD_V2_REPORT, CONTROL),
+	DEVLINK_TRAP(MLD_V1_DONE, CONTROL),
+	DEVLINK_TRAP(IPV4_DHCP, CONTROL),
+	DEVLINK_TRAP(IPV6_DHCP, CONTROL),
+	DEVLINK_TRAP(ARP_REQUEST, CONTROL),
+	DEVLINK_TRAP(ARP_RESPONSE, CONTROL),
+	DEVLINK_TRAP(ARP_OVERLAY, CONTROL),
+	DEVLINK_TRAP(IPV6_NEIGH_SOLICIT, CONTROL),
+	DEVLINK_TRAP(IPV6_NEIGH_ADVERT, CONTROL),
+	DEVLINK_TRAP(IPV4_BFD, CONTROL),
+	DEVLINK_TRAP(IPV6_BFD, CONTROL),
+	DEVLINK_TRAP(IPV4_OSPF, CONTROL),
+	DEVLINK_TRAP(IPV6_OSPF, CONTROL),
+	DEVLINK_TRAP(IPV4_BGP, CONTROL),
+	DEVLINK_TRAP(IPV6_BGP, CONTROL),
+	DEVLINK_TRAP(IPV4_VRRP, CONTROL),
+	DEVLINK_TRAP(IPV6_VRRP, CONTROL),
+	DEVLINK_TRAP(IPV4_PIM, CONTROL),
+	DEVLINK_TRAP(IPV6_PIM, CONTROL),
+	DEVLINK_TRAP(UC_LB, CONTROL),
+	DEVLINK_TRAP(LOCAL_ROUTE, CONTROL),
+	DEVLINK_TRAP(EXTERNAL_ROUTE, CONTROL),
+	DEVLINK_TRAP(IPV6_UC_DIP_LINK_LOCAL_SCOPE, CONTROL),
+	DEVLINK_TRAP(IPV6_DIP_ALL_NODES, CONTROL),
+	DEVLINK_TRAP(IPV6_DIP_ALL_ROUTERS, CONTROL),
+	DEVLINK_TRAP(IPV6_ROUTER_SOLICIT, CONTROL),
+	DEVLINK_TRAP(IPV6_ROUTER_ADVERT, CONTROL),
+	DEVLINK_TRAP(IPV6_REDIRECT, CONTROL),
+	DEVLINK_TRAP(IPV4_ROUTER_ALERT, CONTROL),
+	DEVLINK_TRAP(IPV6_ROUTER_ALERT, CONTROL),
+	DEVLINK_TRAP(PTP_EVENT, CONTROL),
+	DEVLINK_TRAP(PTP_GENERAL, CONTROL),
+	DEVLINK_TRAP(FLOW_ACTION_SAMPLE, CONTROL),
+	DEVLINK_TRAP(FLOW_ACTION_TRAP, CONTROL),
+	DEVLINK_TRAP(EARLY_DROP, DROP),
+	DEVLINK_TRAP(VXLAN_PARSING, DROP),
+	DEVLINK_TRAP(LLC_SNAP_PARSING, DROP),
+	DEVLINK_TRAP(VLAN_PARSING, DROP),
+	DEVLINK_TRAP(PPPOE_PPP_PARSING, DROP),
+	DEVLINK_TRAP(MPLS_PARSING, DROP),
+	DEVLINK_TRAP(ARP_PARSING, DROP),
+	DEVLINK_TRAP(IP_1_PARSING, DROP),
+	DEVLINK_TRAP(IP_N_PARSING, DROP),
+	DEVLINK_TRAP(GRE_PARSING, DROP),
+	DEVLINK_TRAP(UDP_PARSING, DROP),
+	DEVLINK_TRAP(TCP_PARSING, DROP),
+	DEVLINK_TRAP(IPSEC_PARSING, DROP),
+	DEVLINK_TRAP(SCTP_PARSING, DROP),
+	DEVLINK_TRAP(DCCP_PARSING, DROP),
+	DEVLINK_TRAP(GTP_PARSING, DROP),
+	DEVLINK_TRAP(ESP_PARSING, DROP),
+	DEVLINK_TRAP(BLACKHOLE_NEXTHOP, DROP),
+	DEVLINK_TRAP(DMAC_FILTER, DROP),
+	DEVLINK_TRAP(EAPOL, CONTROL),
+	DEVLINK_TRAP(LOCKED_PORT, DROP),
+};
+
+#define DEVLINK_TRAP_GROUP(_id)						      \
+	{								      \
+		.id = DEVLINK_TRAP_GROUP_GENERIC_ID_##_id,		      \
+		.name = DEVLINK_TRAP_GROUP_GENERIC_NAME_##_id,		      \
+	}
+
+static const struct devlink_trap_group devlink_trap_group_generic[] = {
+	DEVLINK_TRAP_GROUP(L2_DROPS),
+	DEVLINK_TRAP_GROUP(L3_DROPS),
+	DEVLINK_TRAP_GROUP(L3_EXCEPTIONS),
+	DEVLINK_TRAP_GROUP(BUFFER_DROPS),
+	DEVLINK_TRAP_GROUP(TUNNEL_DROPS),
+	DEVLINK_TRAP_GROUP(ACL_DROPS),
+	DEVLINK_TRAP_GROUP(STP),
+	DEVLINK_TRAP_GROUP(LACP),
+	DEVLINK_TRAP_GROUP(LLDP),
+	DEVLINK_TRAP_GROUP(MC_SNOOPING),
+	DEVLINK_TRAP_GROUP(DHCP),
+	DEVLINK_TRAP_GROUP(NEIGH_DISCOVERY),
+	DEVLINK_TRAP_GROUP(BFD),
+	DEVLINK_TRAP_GROUP(OSPF),
+	DEVLINK_TRAP_GROUP(BGP),
+	DEVLINK_TRAP_GROUP(VRRP),
+	DEVLINK_TRAP_GROUP(PIM),
+	DEVLINK_TRAP_GROUP(UC_LB),
+	DEVLINK_TRAP_GROUP(LOCAL_DELIVERY),
+	DEVLINK_TRAP_GROUP(EXTERNAL_DELIVERY),
+	DEVLINK_TRAP_GROUP(IPV6),
+	DEVLINK_TRAP_GROUP(PTP_EVENT),
+	DEVLINK_TRAP_GROUP(PTP_GENERAL),
+	DEVLINK_TRAP_GROUP(ACL_SAMPLE),
+	DEVLINK_TRAP_GROUP(ACL_TRAP),
+	DEVLINK_TRAP_GROUP(PARSER_ERROR_DROPS),
+	DEVLINK_TRAP_GROUP(EAPOL),
+};
+
+static int devlink_trap_generic_verify(const struct devlink_trap *trap)
+{
+	if (trap->id > DEVLINK_TRAP_GENERIC_ID_MAX)
+		return -EINVAL;
+
+	if (strcmp(trap->name, devlink_trap_generic[trap->id].name))
+		return -EINVAL;
+
+	if (trap->type != devlink_trap_generic[trap->id].type)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int devlink_trap_driver_verify(const struct devlink_trap *trap)
+{
+	int i;
+
+	if (trap->id <= DEVLINK_TRAP_GENERIC_ID_MAX)
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(devlink_trap_generic); i++) {
+		if (!strcmp(trap->name, devlink_trap_generic[i].name))
+			return -EEXIST;
+	}
+
+	return 0;
+}
+
+static int devlink_trap_verify(const struct devlink_trap *trap)
+{
+	if (!trap || !trap->name)
+		return -EINVAL;
+
+	if (trap->generic)
+		return devlink_trap_generic_verify(trap);
+	else
+		return devlink_trap_driver_verify(trap);
+}
+
+static int
+devlink_trap_group_generic_verify(const struct devlink_trap_group *group)
+{
+	if (group->id > DEVLINK_TRAP_GROUP_GENERIC_ID_MAX)
+		return -EINVAL;
+
+	if (strcmp(group->name, devlink_trap_group_generic[group->id].name))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int
+devlink_trap_group_driver_verify(const struct devlink_trap_group *group)
+{
+	int i;
+
+	if (group->id <= DEVLINK_TRAP_GROUP_GENERIC_ID_MAX)
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(devlink_trap_group_generic); i++) {
+		if (!strcmp(group->name, devlink_trap_group_generic[i].name))
+			return -EEXIST;
+	}
+
+	return 0;
+}
+
+static int devlink_trap_group_verify(const struct devlink_trap_group *group)
+{
+	if (group->generic)
+		return devlink_trap_group_generic_verify(group);
+	else
+		return devlink_trap_group_driver_verify(group);
+}
+
+static void
+devlink_trap_group_notify(struct devlink *devlink,
+			  const struct devlink_trap_group_item *group_item,
+			  enum devlink_command cmd)
+{
+	struct sk_buff *msg;
+	int err;
+
+	WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_GROUP_NEW &&
+		     cmd != DEVLINK_CMD_TRAP_GROUP_DEL);
+	if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+		return;
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return;
+
+	err = devlink_nl_trap_group_fill(msg, devlink, group_item, cmd, 0, 0,
+					 0);
+	if (err) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink),
+				msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+}
+
+void devlink_trap_groups_notify_register(struct devlink *devlink)
+{
+	struct devlink_trap_group_item *group_item;
+
+	list_for_each_entry(group_item, &devlink->trap_group_list, list)
+		devlink_trap_group_notify(devlink, group_item,
+					  DEVLINK_CMD_TRAP_GROUP_NEW);
+}
+
+void devlink_trap_groups_notify_unregister(struct devlink *devlink)
+{
+	struct devlink_trap_group_item *group_item;
+
+	list_for_each_entry_reverse(group_item, &devlink->trap_group_list, list)
+		devlink_trap_group_notify(devlink, group_item,
+					  DEVLINK_CMD_TRAP_GROUP_DEL);
+}
+
+static int
+devlink_trap_item_group_link(struct devlink *devlink,
+			     struct devlink_trap_item *trap_item)
+{
+	u16 group_id = trap_item->trap->init_group_id;
+	struct devlink_trap_group_item *group_item;
+
+	group_item = devlink_trap_group_item_lookup_by_id(devlink, group_id);
+	if (WARN_ON_ONCE(!group_item))
+		return -EINVAL;
+
+	trap_item->group_item = group_item;
+
+	return 0;
+}
+
+static void devlink_trap_notify(struct devlink *devlink,
+				const struct devlink_trap_item *trap_item,
+				enum devlink_command cmd)
+{
+	struct sk_buff *msg;
+	int err;
+
+	WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_NEW &&
+		     cmd != DEVLINK_CMD_TRAP_DEL);
+	if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+		return;
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return;
+
+	err = devlink_nl_trap_fill(msg, devlink, trap_item, cmd, 0, 0, 0);
+	if (err) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink),
+				msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+}
+
+void devlink_traps_notify_register(struct devlink *devlink)
+{
+	struct devlink_trap_item *trap_item;
+
+	list_for_each_entry(trap_item, &devlink->trap_list, list)
+		devlink_trap_notify(devlink, trap_item, DEVLINK_CMD_TRAP_NEW);
+}
+
+void devlink_traps_notify_unregister(struct devlink *devlink)
+{
+	struct devlink_trap_item *trap_item;
+
+	list_for_each_entry_reverse(trap_item, &devlink->trap_list, list)
+		devlink_trap_notify(devlink, trap_item, DEVLINK_CMD_TRAP_DEL);
+}
+
+static int
+devlink_trap_register(struct devlink *devlink,
+		      const struct devlink_trap *trap, void *priv)
+{
+	struct devlink_trap_item *trap_item;
+	int err;
+
+	if (devlink_trap_item_lookup(devlink, trap->name))
+		return -EEXIST;
+
+	trap_item = kzalloc(sizeof(*trap_item), GFP_KERNEL);
+	if (!trap_item)
+		return -ENOMEM;
+
+	trap_item->stats = netdev_alloc_pcpu_stats(struct devlink_stats);
+	if (!trap_item->stats) {
+		err = -ENOMEM;
+		goto err_stats_alloc;
+	}
+
+	trap_item->trap = trap;
+	trap_item->action = trap->init_action;
+	trap_item->priv = priv;
+
+	err = devlink_trap_item_group_link(devlink, trap_item);
+	if (err)
+		goto err_group_link;
+
+	err = devlink->ops->trap_init(devlink, trap, trap_item);
+	if (err)
+		goto err_trap_init;
+
+	list_add_tail(&trap_item->list, &devlink->trap_list);
+	devlink_trap_notify(devlink, trap_item, DEVLINK_CMD_TRAP_NEW);
+
+	return 0;
+
+err_trap_init:
+err_group_link:
+	free_percpu(trap_item->stats);
+err_stats_alloc:
+	kfree(trap_item);
+	return err;
+}
+
+static void devlink_trap_unregister(struct devlink *devlink,
+				    const struct devlink_trap *trap)
+{
+	struct devlink_trap_item *trap_item;
+
+	trap_item = devlink_trap_item_lookup(devlink, trap->name);
+	if (WARN_ON_ONCE(!trap_item))
+		return;
+
+	devlink_trap_notify(devlink, trap_item, DEVLINK_CMD_TRAP_DEL);
+	list_del(&trap_item->list);
+	if (devlink->ops->trap_fini)
+		devlink->ops->trap_fini(devlink, trap, trap_item);
+	free_percpu(trap_item->stats);
+	kfree(trap_item);
+}
+
+static void devlink_trap_disable(struct devlink *devlink,
+				 const struct devlink_trap *trap)
+{
+	struct devlink_trap_item *trap_item;
+
+	trap_item = devlink_trap_item_lookup(devlink, trap->name);
+	if (WARN_ON_ONCE(!trap_item))
+		return;
+
+	devlink->ops->trap_action_set(devlink, trap, DEVLINK_TRAP_ACTION_DROP,
+				      NULL);
+	trap_item->action = DEVLINK_TRAP_ACTION_DROP;
+}
+
+/**
+ * devl_traps_register - Register packet traps with devlink.
+ * @devlink: devlink.
+ * @traps: Packet traps.
+ * @traps_count: Count of provided packet traps.
+ * @priv: Driver private information.
+ *
+ * Return: Non-zero value on failure.
+ */
+int devl_traps_register(struct devlink *devlink,
+			const struct devlink_trap *traps,
+			size_t traps_count, void *priv)
+{
+	int i, err;
+
+	if (!devlink->ops->trap_init || !devlink->ops->trap_action_set)
+		return -EINVAL;
+
+	devl_assert_locked(devlink);
+	for (i = 0; i < traps_count; i++) {
+		const struct devlink_trap *trap = &traps[i];
+
+		err = devlink_trap_verify(trap);
+		if (err)
+			goto err_trap_verify;
+
+		err = devlink_trap_register(devlink, trap, priv);
+		if (err)
+			goto err_trap_register;
+	}
+
+	return 0;
+
+err_trap_register:
+err_trap_verify:
+	for (i--; i >= 0; i--)
+		devlink_trap_unregister(devlink, &traps[i]);
+	return err;
+}
+EXPORT_SYMBOL_GPL(devl_traps_register);
+
+/**
+ * devlink_traps_register - Register packet traps with devlink.
+ * @devlink: devlink.
+ * @traps: Packet traps.
+ * @traps_count: Count of provided packet traps.
+ * @priv: Driver private information.
+ *
+ * Context: Takes and release devlink->lock <mutex>.
+ *
+ * Return: Non-zero value on failure.
+ */
+int devlink_traps_register(struct devlink *devlink,
+			   const struct devlink_trap *traps,
+			   size_t traps_count, void *priv)
+{
+	int err;
+
+	devl_lock(devlink);
+	err = devl_traps_register(devlink, traps, traps_count, priv);
+	devl_unlock(devlink);
+	return err;
+}
+EXPORT_SYMBOL_GPL(devlink_traps_register);
+
+/**
+ * devl_traps_unregister - Unregister packet traps from devlink.
+ * @devlink: devlink.
+ * @traps: Packet traps.
+ * @traps_count: Count of provided packet traps.
+ */
+void devl_traps_unregister(struct devlink *devlink,
+			   const struct devlink_trap *traps,
+			   size_t traps_count)
+{
+	int i;
+
+	devl_assert_locked(devlink);
+	/* Make sure we do not have any packets in-flight while unregistering
+	 * traps by disabling all of them and waiting for a grace period.
+	 */
+	for (i = traps_count - 1; i >= 0; i--)
+		devlink_trap_disable(devlink, &traps[i]);
+	synchronize_rcu();
+	for (i = traps_count - 1; i >= 0; i--)
+		devlink_trap_unregister(devlink, &traps[i]);
+}
+EXPORT_SYMBOL_GPL(devl_traps_unregister);
+
+/**
+ * devlink_traps_unregister - Unregister packet traps from devlink.
+ * @devlink: devlink.
+ * @traps: Packet traps.
+ * @traps_count: Count of provided packet traps.
+ *
+ * Context: Takes and release devlink->lock <mutex>.
+ */
+void devlink_traps_unregister(struct devlink *devlink,
+			      const struct devlink_trap *traps,
+			      size_t traps_count)
+{
+	devl_lock(devlink);
+	devl_traps_unregister(devlink, traps, traps_count);
+	devl_unlock(devlink);
+}
+EXPORT_SYMBOL_GPL(devlink_traps_unregister);
+
+static void
+devlink_trap_stats_update(struct devlink_stats __percpu *trap_stats,
+			  size_t skb_len)
+{
+	struct devlink_stats *stats;
+
+	stats = this_cpu_ptr(trap_stats);
+	u64_stats_update_begin(&stats->syncp);
+	u64_stats_add(&stats->rx_bytes, skb_len);
+	u64_stats_inc(&stats->rx_packets);
+	u64_stats_update_end(&stats->syncp);
+}
+
+static void
+devlink_trap_report_metadata_set(struct devlink_trap_metadata *metadata,
+				 const struct devlink_trap_item *trap_item,
+				 struct devlink_port *in_devlink_port,
+				 const struct flow_action_cookie *fa_cookie)
+{
+	metadata->trap_name = trap_item->trap->name;
+	metadata->trap_group_name = trap_item->group_item->group->name;
+	metadata->fa_cookie = fa_cookie;
+	metadata->trap_type = trap_item->trap->type;
+
+	spin_lock(&in_devlink_port->type_lock);
+	if (in_devlink_port->type == DEVLINK_PORT_TYPE_ETH)
+		metadata->input_dev = in_devlink_port->type_eth.netdev;
+	spin_unlock(&in_devlink_port->type_lock);
+}
+
+/**
+ * devlink_trap_report - Report trapped packet to drop monitor.
+ * @devlink: devlink.
+ * @skb: Trapped packet.
+ * @trap_ctx: Trap context.
+ * @in_devlink_port: Input devlink port.
+ * @fa_cookie: Flow action cookie. Could be NULL.
+ */
+void devlink_trap_report(struct devlink *devlink, struct sk_buff *skb,
+			 void *trap_ctx, struct devlink_port *in_devlink_port,
+			 const struct flow_action_cookie *fa_cookie)
+
+{
+	struct devlink_trap_item *trap_item = trap_ctx;
+
+	devlink_trap_stats_update(trap_item->stats, skb->len);
+	devlink_trap_stats_update(trap_item->group_item->stats, skb->len);
+
+	if (tracepoint_enabled(devlink_trap_report)) {
+		struct devlink_trap_metadata metadata = {};
+
+		devlink_trap_report_metadata_set(&metadata, trap_item,
+						 in_devlink_port, fa_cookie);
+		trace_devlink_trap_report(devlink, skb, &metadata);
+	}
+}
+EXPORT_SYMBOL_GPL(devlink_trap_report);
+
+/**
+ * devlink_trap_ctx_priv - Trap context to driver private information.
+ * @trap_ctx: Trap context.
+ *
+ * Return: Driver private information passed during registration.
+ */
+void *devlink_trap_ctx_priv(void *trap_ctx)
+{
+	struct devlink_trap_item *trap_item = trap_ctx;
+
+	return trap_item->priv;
+}
+EXPORT_SYMBOL_GPL(devlink_trap_ctx_priv);
+
+static int
+devlink_trap_group_item_policer_link(struct devlink *devlink,
+				     struct devlink_trap_group_item *group_item)
+{
+	u32 policer_id = group_item->group->init_policer_id;
+	struct devlink_trap_policer_item *policer_item;
+
+	if (policer_id == 0)
+		return 0;
+
+	policer_item = devlink_trap_policer_item_lookup(devlink, policer_id);
+	if (WARN_ON_ONCE(!policer_item))
+		return -EINVAL;
+
+	group_item->policer_item = policer_item;
+
+	return 0;
+}
+
+static int
+devlink_trap_group_register(struct devlink *devlink,
+			    const struct devlink_trap_group *group)
+{
+	struct devlink_trap_group_item *group_item;
+	int err;
+
+	if (devlink_trap_group_item_lookup(devlink, group->name))
+		return -EEXIST;
+
+	group_item = kzalloc(sizeof(*group_item), GFP_KERNEL);
+	if (!group_item)
+		return -ENOMEM;
+
+	group_item->stats = netdev_alloc_pcpu_stats(struct devlink_stats);
+	if (!group_item->stats) {
+		err = -ENOMEM;
+		goto err_stats_alloc;
+	}
+
+	group_item->group = group;
+
+	err = devlink_trap_group_item_policer_link(devlink, group_item);
+	if (err)
+		goto err_policer_link;
+
+	if (devlink->ops->trap_group_init) {
+		err = devlink->ops->trap_group_init(devlink, group);
+		if (err)
+			goto err_group_init;
+	}
+
+	list_add_tail(&group_item->list, &devlink->trap_group_list);
+	devlink_trap_group_notify(devlink, group_item,
+				  DEVLINK_CMD_TRAP_GROUP_NEW);
+
+	return 0;
+
+err_group_init:
+err_policer_link:
+	free_percpu(group_item->stats);
+err_stats_alloc:
+	kfree(group_item);
+	return err;
+}
+
+static void
+devlink_trap_group_unregister(struct devlink *devlink,
+			      const struct devlink_trap_group *group)
+{
+	struct devlink_trap_group_item *group_item;
+
+	group_item = devlink_trap_group_item_lookup(devlink, group->name);
+	if (WARN_ON_ONCE(!group_item))
+		return;
+
+	devlink_trap_group_notify(devlink, group_item,
+				  DEVLINK_CMD_TRAP_GROUP_DEL);
+	list_del(&group_item->list);
+	free_percpu(group_item->stats);
+	kfree(group_item);
+}
+
+/**
+ * devl_trap_groups_register - Register packet trap groups with devlink.
+ * @devlink: devlink.
+ * @groups: Packet trap groups.
+ * @groups_count: Count of provided packet trap groups.
+ *
+ * Return: Non-zero value on failure.
+ */
+int devl_trap_groups_register(struct devlink *devlink,
+			      const struct devlink_trap_group *groups,
+			      size_t groups_count)
+{
+	int i, err;
+
+	devl_assert_locked(devlink);
+	for (i = 0; i < groups_count; i++) {
+		const struct devlink_trap_group *group = &groups[i];
+
+		err = devlink_trap_group_verify(group);
+		if (err)
+			goto err_trap_group_verify;
+
+		err = devlink_trap_group_register(devlink, group);
+		if (err)
+			goto err_trap_group_register;
+	}
+
+	return 0;
+
+err_trap_group_register:
+err_trap_group_verify:
+	for (i--; i >= 0; i--)
+		devlink_trap_group_unregister(devlink, &groups[i]);
+	return err;
+}
+EXPORT_SYMBOL_GPL(devl_trap_groups_register);
+
+/**
+ * devlink_trap_groups_register - Register packet trap groups with devlink.
+ * @devlink: devlink.
+ * @groups: Packet trap groups.
+ * @groups_count: Count of provided packet trap groups.
+ *
+ * Context: Takes and release devlink->lock <mutex>.
+ *
+ * Return: Non-zero value on failure.
+ */
+int devlink_trap_groups_register(struct devlink *devlink,
+				 const struct devlink_trap_group *groups,
+				 size_t groups_count)
+{
+	int err;
+
+	devl_lock(devlink);
+	err = devl_trap_groups_register(devlink, groups, groups_count);
+	devl_unlock(devlink);
+	return err;
+}
+EXPORT_SYMBOL_GPL(devlink_trap_groups_register);
+
+/**
+ * devl_trap_groups_unregister - Unregister packet trap groups from devlink.
+ * @devlink: devlink.
+ * @groups: Packet trap groups.
+ * @groups_count: Count of provided packet trap groups.
+ */
+void devl_trap_groups_unregister(struct devlink *devlink,
+				 const struct devlink_trap_group *groups,
+				 size_t groups_count)
+{
+	int i;
+
+	devl_assert_locked(devlink);
+	for (i = groups_count - 1; i >= 0; i--)
+		devlink_trap_group_unregister(devlink, &groups[i]);
+}
+EXPORT_SYMBOL_GPL(devl_trap_groups_unregister);
+
+/**
+ * devlink_trap_groups_unregister - Unregister packet trap groups from devlink.
+ * @devlink: devlink.
+ * @groups: Packet trap groups.
+ * @groups_count: Count of provided packet trap groups.
+ *
+ * Context: Takes and release devlink->lock <mutex>.
+ */
+void devlink_trap_groups_unregister(struct devlink *devlink,
+				    const struct devlink_trap_group *groups,
+				    size_t groups_count)
+{
+	devl_lock(devlink);
+	devl_trap_groups_unregister(devlink, groups, groups_count);
+	devl_unlock(devlink);
+}
+EXPORT_SYMBOL_GPL(devlink_trap_groups_unregister);
+
+static void
+devlink_trap_policer_notify(struct devlink *devlink,
+			    const struct devlink_trap_policer_item *policer_item,
+			    enum devlink_command cmd)
+{
+	struct sk_buff *msg;
+	int err;
+
+	WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_POLICER_NEW &&
+		     cmd != DEVLINK_CMD_TRAP_POLICER_DEL);
+	if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+		return;
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return;
+
+	err = devlink_nl_trap_policer_fill(msg, devlink, policer_item, cmd, 0,
+					   0, 0);
+	if (err) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink),
+				msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+}
+
+void devlink_trap_policers_notify_register(struct devlink *devlink)
+{
+	struct devlink_trap_policer_item *policer_item;
+
+	list_for_each_entry(policer_item, &devlink->trap_policer_list, list)
+		devlink_trap_policer_notify(devlink, policer_item,
+					    DEVLINK_CMD_TRAP_POLICER_NEW);
+}
+
+void devlink_trap_policers_notify_unregister(struct devlink *devlink)
+{
+	struct devlink_trap_policer_item *policer_item;
+
+	list_for_each_entry_reverse(policer_item, &devlink->trap_policer_list,
+				    list)
+		devlink_trap_policer_notify(devlink, policer_item,
+					    DEVLINK_CMD_TRAP_POLICER_DEL);
+}
+
+static int
+devlink_trap_policer_register(struct devlink *devlink,
+			      const struct devlink_trap_policer *policer)
+{
+	struct devlink_trap_policer_item *policer_item;
+	int err;
+
+	if (devlink_trap_policer_item_lookup(devlink, policer->id))
+		return -EEXIST;
+
+	policer_item = kzalloc(sizeof(*policer_item), GFP_KERNEL);
+	if (!policer_item)
+		return -ENOMEM;
+
+	policer_item->policer = policer;
+	policer_item->rate = policer->init_rate;
+	policer_item->burst = policer->init_burst;
+
+	if (devlink->ops->trap_policer_init) {
+		err = devlink->ops->trap_policer_init(devlink, policer);
+		if (err)
+			goto err_policer_init;
+	}
+
+	list_add_tail(&policer_item->list, &devlink->trap_policer_list);
+	devlink_trap_policer_notify(devlink, policer_item,
+				    DEVLINK_CMD_TRAP_POLICER_NEW);
+
+	return 0;
+
+err_policer_init:
+	kfree(policer_item);
+	return err;
+}
+
+static void
+devlink_trap_policer_unregister(struct devlink *devlink,
+				const struct devlink_trap_policer *policer)
+{
+	struct devlink_trap_policer_item *policer_item;
+
+	policer_item = devlink_trap_policer_item_lookup(devlink, policer->id);
+	if (WARN_ON_ONCE(!policer_item))
+		return;
+
+	devlink_trap_policer_notify(devlink, policer_item,
+				    DEVLINK_CMD_TRAP_POLICER_DEL);
+	list_del(&policer_item->list);
+	if (devlink->ops->trap_policer_fini)
+		devlink->ops->trap_policer_fini(devlink, policer);
+	kfree(policer_item);
+}
+
+/**
+ * devl_trap_policers_register - Register packet trap policers with devlink.
+ * @devlink: devlink.
+ * @policers: Packet trap policers.
+ * @policers_count: Count of provided packet trap policers.
+ *
+ * Return: Non-zero value on failure.
+ */
+int
+devl_trap_policers_register(struct devlink *devlink,
+			    const struct devlink_trap_policer *policers,
+			    size_t policers_count)
+{
+	int i, err;
+
+	devl_assert_locked(devlink);
+	for (i = 0; i < policers_count; i++) {
+		const struct devlink_trap_policer *policer = &policers[i];
+
+		if (WARN_ON(policer->id == 0 ||
+			    policer->max_rate < policer->min_rate ||
+			    policer->max_burst < policer->min_burst)) {
+			err = -EINVAL;
+			goto err_trap_policer_verify;
+		}
+
+		err = devlink_trap_policer_register(devlink, policer);
+		if (err)
+			goto err_trap_policer_register;
+	}
+	return 0;
+
+err_trap_policer_register:
+err_trap_policer_verify:
+	for (i--; i >= 0; i--)
+		devlink_trap_policer_unregister(devlink, &policers[i]);
+	return err;
+}
+EXPORT_SYMBOL_GPL(devl_trap_policers_register);
+
+/**
+ * devl_trap_policers_unregister - Unregister packet trap policers from devlink.
+ * @devlink: devlink.
+ * @policers: Packet trap policers.
+ * @policers_count: Count of provided packet trap policers.
+ */
+void
+devl_trap_policers_unregister(struct devlink *devlink,
+			      const struct devlink_trap_policer *policers,
+			      size_t policers_count)
+{
+	int i;
+
+	devl_assert_locked(devlink);
+	for (i = policers_count - 1; i >= 0; i--)
+		devlink_trap_policer_unregister(devlink, &policers[i]);
+}
+EXPORT_SYMBOL_GPL(devl_trap_policers_unregister);