linux/net/devlink/dpipe.c

// 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 "devl_internal.h"

static struct devlink_dpipe_field devlink_dpipe_fields_ethernet[] = {
	{
		.name = "destination mac",
		.id = DEVLINK_DPIPE_FIELD_ETHERNET_DST_MAC,
		.bitwidth = 48,
	},
};

struct devlink_dpipe_header devlink_dpipe_header_ethernet = {
	.name = "ethernet",
	.id = DEVLINK_DPIPE_HEADER_ETHERNET,
	.fields = devlink_dpipe_fields_ethernet,
	.fields_count = ARRAY_SIZE(devlink_dpipe_fields_ethernet),
	.global = true,
};
EXPORT_SYMBOL_GPL(devlink_dpipe_header_ethernet);

static struct devlink_dpipe_field devlink_dpipe_fields_ipv4[] = {
	{
		.name = "destination ip",
		.id = DEVLINK_DPIPE_FIELD_IPV4_DST_IP,
		.bitwidth = 32,
	},
};

struct devlink_dpipe_header devlink_dpipe_header_ipv4 = {
	.name = "ipv4",
	.id = DEVLINK_DPIPE_HEADER_IPV4,
	.fields = devlink_dpipe_fields_ipv4,
	.fields_count = ARRAY_SIZE(devlink_dpipe_fields_ipv4),
	.global = true,
};
EXPORT_SYMBOL_GPL(devlink_dpipe_header_ipv4);

static struct devlink_dpipe_field devlink_dpipe_fields_ipv6[] = {
	{
		.name = "destination ip",
		.id = DEVLINK_DPIPE_FIELD_IPV6_DST_IP,
		.bitwidth = 128,
	},
};

struct devlink_dpipe_header devlink_dpipe_header_ipv6 = {
	.name = "ipv6",
	.id = DEVLINK_DPIPE_HEADER_IPV6,
	.fields = devlink_dpipe_fields_ipv6,
	.fields_count = ARRAY_SIZE(devlink_dpipe_fields_ipv6),
	.global = true,
};
EXPORT_SYMBOL_GPL(devlink_dpipe_header_ipv6);

int devlink_dpipe_match_put(struct sk_buff *skb,
			    struct devlink_dpipe_match *match)
{
	struct devlink_dpipe_header *header = match->header;
	struct devlink_dpipe_field *field = &header->fields[match->field_id];
	struct nlattr *match_attr;

	match_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_DPIPE_MATCH);
	if (!match_attr)
		return -EMSGSIZE;

	if (nla_put_u32(skb, DEVLINK_ATTR_DPIPE_MATCH_TYPE, match->type) ||
	    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_HEADER_INDEX, match->header_index) ||
	    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_HEADER_ID, header->id) ||
	    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_FIELD_ID, field->id) ||
	    nla_put_u8(skb, DEVLINK_ATTR_DPIPE_HEADER_GLOBAL, header->global))
		goto nla_put_failure;

	nla_nest_end(skb, match_attr);
	return 0;

nla_put_failure:
	nla_nest_cancel(skb, match_attr);
	return -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(devlink_dpipe_match_put);

static int devlink_dpipe_matches_put(struct devlink_dpipe_table *table,
				     struct sk_buff *skb)
{
	struct nlattr *matches_attr;

	matches_attr = nla_nest_start_noflag(skb,
					     DEVLINK_ATTR_DPIPE_TABLE_MATCHES);
	if (!matches_attr)
		return -EMSGSIZE;

	if (table->table_ops->matches_dump(table->priv, skb))
		goto nla_put_failure;

	nla_nest_end(skb, matches_attr);
	return 0;

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

int devlink_dpipe_action_put(struct sk_buff *skb,
			     struct devlink_dpipe_action *action)
{
	struct devlink_dpipe_header *header = action->header;
	struct devlink_dpipe_field *field = &header->fields[action->field_id];
	struct nlattr *action_attr;

	action_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_DPIPE_ACTION);
	if (!action_attr)
		return -EMSGSIZE;

	if (nla_put_u32(skb, DEVLINK_ATTR_DPIPE_ACTION_TYPE, action->type) ||
	    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_HEADER_INDEX, action->header_index) ||
	    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_HEADER_ID, header->id) ||
	    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_FIELD_ID, field->id) ||
	    nla_put_u8(skb, DEVLINK_ATTR_DPIPE_HEADER_GLOBAL, header->global))
		goto nla_put_failure;

	nla_nest_end(skb, action_attr);
	return 0;

nla_put_failure:
	nla_nest_cancel(skb, action_attr);
	return -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(devlink_dpipe_action_put);

static int devlink_dpipe_actions_put(struct devlink_dpipe_table *table,
				     struct sk_buff *skb)
{
	struct nlattr *actions_attr;

	actions_attr = nla_nest_start_noflag(skb,
					     DEVLINK_ATTR_DPIPE_TABLE_ACTIONS);
	if (!actions_attr)
		return -EMSGSIZE;

	if (table->table_ops->actions_dump(table->priv, skb))
		goto nla_put_failure;

	nla_nest_end(skb, actions_attr);
	return 0;

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

static int devlink_dpipe_table_put(struct sk_buff *skb,
				   struct devlink_dpipe_table *table)
{
	struct nlattr *table_attr;
	u64 table_size;

	table_size = table->table_ops->size_get(table->priv);
	table_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_DPIPE_TABLE);
	if (!table_attr)
		return -EMSGSIZE;

	if (nla_put_string(skb, DEVLINK_ATTR_DPIPE_TABLE_NAME, table->name) ||
	    nla_put_u64_64bit(skb, DEVLINK_ATTR_DPIPE_TABLE_SIZE, table_size,
			      DEVLINK_ATTR_PAD))
		goto nla_put_failure;
	if (nla_put_u8(skb, DEVLINK_ATTR_DPIPE_TABLE_COUNTERS_ENABLED,
		       table->counters_enabled))
		goto nla_put_failure;

	if (table->resource_valid) {
		if (nla_put_u64_64bit(skb, DEVLINK_ATTR_DPIPE_TABLE_RESOURCE_ID,
				      table->resource_id, DEVLINK_ATTR_PAD) ||
		    nla_put_u64_64bit(skb, DEVLINK_ATTR_DPIPE_TABLE_RESOURCE_UNITS,
				      table->resource_units, DEVLINK_ATTR_PAD))
			goto nla_put_failure;
	}
	if (devlink_dpipe_matches_put(table, skb))
		goto nla_put_failure;

	if (devlink_dpipe_actions_put(table, skb))
		goto nla_put_failure;

	nla_nest_end(skb, table_attr);
	return 0;

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

static int devlink_dpipe_send_and_alloc_skb(struct sk_buff **pskb,
					    struct genl_info *info)
{
	int err;

	if (*pskb) {
		err = genlmsg_reply(*pskb, info);
		if (err)
			return err;
	}
	*pskb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!*pskb)
		return -ENOMEM;
	return 0;
}

static int devlink_dpipe_tables_fill(struct genl_info *info,
				     enum devlink_command cmd, int flags,
				     struct list_head *dpipe_tables,
				     const char *table_name)
{
	struct devlink *devlink = info->user_ptr[0];
	struct devlink_dpipe_table *table;
	struct nlattr *tables_attr;
	struct sk_buff *skb = NULL;
	struct nlmsghdr *nlh;
	bool incomplete;
	void *hdr;
	int i;
	int err;

	table = list_first_entry(dpipe_tables,
				 struct devlink_dpipe_table, list);
start_again:
	err = devlink_dpipe_send_and_alloc_skb(&skb, info);
	if (err)
		return err;

	hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq,
			  &devlink_nl_family, NLM_F_MULTI, cmd);
	if (!hdr) {
		nlmsg_free(skb);
		return -EMSGSIZE;
	}

	if (devlink_nl_put_handle(skb, devlink))
		goto nla_put_failure;
	tables_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_DPIPE_TABLES);
	if (!tables_attr)
		goto nla_put_failure;

	i = 0;
	incomplete = false;
	list_for_each_entry_from(table, dpipe_tables, list) {
		if (!table_name) {
			err = devlink_dpipe_table_put(skb, table);
			if (err) {
				if (!i)
					goto err_table_put;
				incomplete = true;
				break;
			}
		} else {
			if (!strcmp(table->name, table_name)) {
				err = devlink_dpipe_table_put(skb, table);
				if (err)
					break;
			}
		}
		i++;
	}

	nla_nest_end(skb, tables_attr);
	genlmsg_end(skb, hdr);
	if (incomplete)
		goto start_again;

send_done:
	nlh = nlmsg_put(skb, info->snd_portid, info->snd_seq,
			NLMSG_DONE, 0, flags | NLM_F_MULTI);
	if (!nlh) {
		err = devlink_dpipe_send_and_alloc_skb(&skb, info);
		if (err)
			return err;
		goto send_done;
	}

	return genlmsg_reply(skb, info);

nla_put_failure:
	err = -EMSGSIZE;
err_table_put:
	nlmsg_free(skb);
	return err;
}

int devlink_nl_dpipe_table_get_doit(struct sk_buff *skb, struct genl_info *info)
{
	struct devlink *devlink = info->user_ptr[0];
	const char *table_name =  NULL;

	if (info->attrs[DEVLINK_ATTR_DPIPE_TABLE_NAME])
		table_name = nla_data(info->attrs[DEVLINK_ATTR_DPIPE_TABLE_NAME]);

	return devlink_dpipe_tables_fill(info, DEVLINK_CMD_DPIPE_TABLE_GET, 0,
					 &devlink->dpipe_table_list,
					 table_name);
}

static int devlink_dpipe_value_put(struct sk_buff *skb,
				   struct devlink_dpipe_value *value)
{
	if (nla_put(skb, DEVLINK_ATTR_DPIPE_VALUE,
		    value->value_size, value->value))
		return -EMSGSIZE;
	if (value->mask)
		if (nla_put(skb, DEVLINK_ATTR_DPIPE_VALUE_MASK,
			    value->value_size, value->mask))
			return -EMSGSIZE;
	if (value->mapping_valid)
		if (nla_put_u32(skb, DEVLINK_ATTR_DPIPE_VALUE_MAPPING,
				value->mapping_value))
			return -EMSGSIZE;
	return 0;
}

static int devlink_dpipe_action_value_put(struct sk_buff *skb,
					  struct devlink_dpipe_value *value)
{
	if (!value->action)
		return -EINVAL;
	if (devlink_dpipe_action_put(skb, value->action))
		return -EMSGSIZE;
	if (devlink_dpipe_value_put(skb, value))
		return -EMSGSIZE;
	return 0;
}

static int devlink_dpipe_action_values_put(struct sk_buff *skb,
					   struct devlink_dpipe_value *values,
					   unsigned int values_count)
{
	struct nlattr *action_attr;
	int i;
	int err;

	for (i = 0; i < values_count; i++) {
		action_attr = nla_nest_start_noflag(skb,
						    DEVLINK_ATTR_DPIPE_ACTION_VALUE);
		if (!action_attr)
			return -EMSGSIZE;
		err = devlink_dpipe_action_value_put(skb, &values[i]);
		if (err)
			goto err_action_value_put;
		nla_nest_end(skb, action_attr);
	}
	return 0;

err_action_value_put:
	nla_nest_cancel(skb, action_attr);
	return err;
}

static int devlink_dpipe_match_value_put(struct sk_buff *skb,
					 struct devlink_dpipe_value *value)
{
	if (!value->match)
		return -EINVAL;
	if (devlink_dpipe_match_put(skb, value->match))
		return -EMSGSIZE;
	if (devlink_dpipe_value_put(skb, value))
		return -EMSGSIZE;
	return 0;
}

static int devlink_dpipe_match_values_put(struct sk_buff *skb,
					  struct devlink_dpipe_value *values,
					  unsigned int values_count)
{
	struct nlattr *match_attr;
	int i;
	int err;

	for (i = 0; i < values_count; i++) {
		match_attr = nla_nest_start_noflag(skb,
						   DEVLINK_ATTR_DPIPE_MATCH_VALUE);
		if (!match_attr)
			return -EMSGSIZE;
		err = devlink_dpipe_match_value_put(skb, &values[i]);
		if (err)
			goto err_match_value_put;
		nla_nest_end(skb, match_attr);
	}
	return 0;

err_match_value_put:
	nla_nest_cancel(skb, match_attr);
	return err;
}

static int devlink_dpipe_entry_put(struct sk_buff *skb,
				   struct devlink_dpipe_entry *entry)
{
	struct nlattr *entry_attr, *matches_attr, *actions_attr;
	int err;

	entry_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_DPIPE_ENTRY);
	if (!entry_attr)
		return  -EMSGSIZE;

	if (nla_put_u64_64bit(skb, DEVLINK_ATTR_DPIPE_ENTRY_INDEX, entry->index,
			      DEVLINK_ATTR_PAD))
		goto nla_put_failure;
	if (entry->counter_valid)
		if (nla_put_u64_64bit(skb, DEVLINK_ATTR_DPIPE_ENTRY_COUNTER,
				      entry->counter, DEVLINK_ATTR_PAD))
			goto nla_put_failure;

	matches_attr = nla_nest_start_noflag(skb,
					     DEVLINK_ATTR_DPIPE_ENTRY_MATCH_VALUES);
	if (!matches_attr)
		goto nla_put_failure;

	err = devlink_dpipe_match_values_put(skb, entry->match_values,
					     entry->match_values_count);
	if (err) {
		nla_nest_cancel(skb, matches_attr);
		goto err_match_values_put;
	}
	nla_nest_end(skb, matches_attr);

	actions_attr = nla_nest_start_noflag(skb,
					     DEVLINK_ATTR_DPIPE_ENTRY_ACTION_VALUES);
	if (!actions_attr)
		goto nla_put_failure;

	err = devlink_dpipe_action_values_put(skb, entry->action_values,
					      entry->action_values_count);
	if (err) {
		nla_nest_cancel(skb, actions_attr);
		goto err_action_values_put;
	}
	nla_nest_end(skb, actions_attr);

	nla_nest_end(skb, entry_attr);
	return 0;

nla_put_failure:
	err = -EMSGSIZE;
err_match_values_put:
err_action_values_put:
	nla_nest_cancel(skb, entry_attr);
	return err;
}

static struct devlink_dpipe_table *
devlink_dpipe_table_find(struct list_head *dpipe_tables,
			 const char *table_name, struct devlink *devlink)
{
	struct devlink_dpipe_table *table;

	list_for_each_entry_rcu(table, dpipe_tables, list,
				lockdep_is_held(&devlink->lock)) {
		if (!strcmp(table->name, table_name))
			return table;
	}
	return NULL;
}

int devlink_dpipe_entry_ctx_prepare(struct devlink_dpipe_dump_ctx *dump_ctx)
{
	struct devlink *devlink;
	int err;

	err = devlink_dpipe_send_and_alloc_skb(&dump_ctx->skb,
					       dump_ctx->info);
	if (err)
		return err;

	dump_ctx->hdr = genlmsg_put(dump_ctx->skb,
				    dump_ctx->info->snd_portid,
				    dump_ctx->info->snd_seq,
				    &devlink_nl_family, NLM_F_MULTI,
				    dump_ctx->cmd);
	if (!dump_ctx->hdr)
		goto nla_put_failure;

	devlink = dump_ctx->info->user_ptr[0];
	if (devlink_nl_put_handle(dump_ctx->skb, devlink))
		goto nla_put_failure;
	dump_ctx->nest = nla_nest_start_noflag(dump_ctx->skb,
					       DEVLINK_ATTR_DPIPE_ENTRIES);
	if (!dump_ctx->nest)
		goto nla_put_failure;
	return 0;

nla_put_failure:
	nlmsg_free(dump_ctx->skb);
	return -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(devlink_dpipe_entry_ctx_prepare);

int devlink_dpipe_entry_ctx_append(struct devlink_dpipe_dump_ctx *dump_ctx,
				   struct devlink_dpipe_entry *entry)
{
	return devlink_dpipe_entry_put(dump_ctx->skb, entry);
}
EXPORT_SYMBOL_GPL(devlink_dpipe_entry_ctx_append);

int devlink_dpipe_entry_ctx_close(struct devlink_dpipe_dump_ctx *dump_ctx)
{
	nla_nest_end(dump_ctx->skb, dump_ctx->nest);
	genlmsg_end(dump_ctx->skb, dump_ctx->hdr);
	return 0;
}
EXPORT_SYMBOL_GPL(devlink_dpipe_entry_ctx_close);

void devlink_dpipe_entry_clear(struct devlink_dpipe_entry *entry)

{
	unsigned int value_count, value_index;
	struct devlink_dpipe_value *value;

	value = entry->action_values;
	value_count = entry->action_values_count;
	for (value_index = 0; value_index < value_count; value_index++) {
		kfree(value[value_index].value);
		kfree(value[value_index].mask);
	}

	value = entry->match_values;
	value_count = entry->match_values_count;
	for (value_index = 0; value_index < value_count; value_index++) {
		kfree(value[value_index].value);
		kfree(value[value_index].mask);
	}
}
EXPORT_SYMBOL_GPL(devlink_dpipe_entry_clear);

static int devlink_dpipe_entries_fill(struct genl_info *info,
				      enum devlink_command cmd, int flags,
				      struct devlink_dpipe_table *table)
{
	struct devlink_dpipe_dump_ctx dump_ctx;
	struct nlmsghdr *nlh;
	int err;

	dump_ctx.skb = NULL;
	dump_ctx.cmd = cmd;
	dump_ctx.info = info;

	err = table->table_ops->entries_dump(table->priv,
					     table->counters_enabled,
					     &dump_ctx);
	if (err)
		return err;

send_done:
	nlh = nlmsg_put(dump_ctx.skb, info->snd_portid, info->snd_seq,
			NLMSG_DONE, 0, flags | NLM_F_MULTI);
	if (!nlh) {
		err = devlink_dpipe_send_and_alloc_skb(&dump_ctx.skb, info);
		if (err)
			return err;
		goto send_done;
	}
	return genlmsg_reply(dump_ctx.skb, info);
}

int devlink_nl_dpipe_entries_get_doit(struct sk_buff *skb,
				      struct genl_info *info)
{
	struct devlink *devlink = info->user_ptr[0];
	struct devlink_dpipe_table *table;
	const char *table_name;

	if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_DPIPE_TABLE_NAME))
		return -EINVAL;

	table_name = nla_data(info->attrs[DEVLINK_ATTR_DPIPE_TABLE_NAME]);
	table = devlink_dpipe_table_find(&devlink->dpipe_table_list,
					 table_name, devlink);
	if (!table)
		return -EINVAL;

	if (!table->table_ops->entries_dump)
		return -EINVAL;

	return devlink_dpipe_entries_fill(info, DEVLINK_CMD_DPIPE_ENTRIES_GET,
					  0, table);
}

static int devlink_dpipe_fields_put(struct sk_buff *skb,
				    const struct devlink_dpipe_header *header)
{
	struct devlink_dpipe_field *field;
	struct nlattr *field_attr;
	int i;

	for (i = 0; i < header->fields_count; i++) {
		field = &header->fields[i];
		field_attr = nla_nest_start_noflag(skb,
						   DEVLINK_ATTR_DPIPE_FIELD);
		if (!field_attr)
			return -EMSGSIZE;
		if (nla_put_string(skb, DEVLINK_ATTR_DPIPE_FIELD_NAME, field->name) ||
		    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_FIELD_ID, field->id) ||
		    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_FIELD_BITWIDTH, field->bitwidth) ||
		    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_FIELD_MAPPING_TYPE, field->mapping_type))
			goto nla_put_failure;
		nla_nest_end(skb, field_attr);
	}
	return 0;

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

static int devlink_dpipe_header_put(struct sk_buff *skb,
				    struct devlink_dpipe_header *header)
{
	struct nlattr *fields_attr, *header_attr;
	int err;

	header_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_DPIPE_HEADER);
	if (!header_attr)
		return -EMSGSIZE;

	if (nla_put_string(skb, DEVLINK_ATTR_DPIPE_HEADER_NAME, header->name) ||
	    nla_put_u32(skb, DEVLINK_ATTR_DPIPE_HEADER_ID, header->id) ||
	    nla_put_u8(skb, DEVLINK_ATTR_DPIPE_HEADER_GLOBAL, header->global))
		goto nla_put_failure;

	fields_attr = nla_nest_start_noflag(skb,
					    DEVLINK_ATTR_DPIPE_HEADER_FIELDS);
	if (!fields_attr)
		goto nla_put_failure;

	err = devlink_dpipe_fields_put(skb, header);
	if (err) {
		nla_nest_cancel(skb, fields_attr);
		goto nla_put_failure;
	}
	nla_nest_end(skb, fields_attr);
	nla_nest_end(skb, header_attr);
	return 0;

nla_put_failure:
	err = -EMSGSIZE;
	nla_nest_cancel(skb, header_attr);
	return err;
}

static int devlink_dpipe_headers_fill(struct genl_info *info,
				      enum devlink_command cmd, int flags,
				      struct devlink_dpipe_headers *
				      dpipe_headers)
{
	struct devlink *devlink = info->user_ptr[0];
	struct nlattr *headers_attr;
	struct sk_buff *skb = NULL;
	struct nlmsghdr *nlh;
	void *hdr;
	int i, j;
	int err;

	i = 0;
start_again:
	err = devlink_dpipe_send_and_alloc_skb(&skb, info);
	if (err)
		return err;

	hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq,
			  &devlink_nl_family, NLM_F_MULTI, cmd);
	if (!hdr) {
		nlmsg_free(skb);
		return -EMSGSIZE;
	}

	if (devlink_nl_put_handle(skb, devlink))
		goto nla_put_failure;
	headers_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_DPIPE_HEADERS);
	if (!headers_attr)
		goto nla_put_failure;

	j = 0;
	for (; i < dpipe_headers->headers_count; i++) {
		err = devlink_dpipe_header_put(skb, dpipe_headers->headers[i]);
		if (err) {
			if (!j)
				goto err_table_put;
			break;
		}
		j++;
	}
	nla_nest_end(skb, headers_attr);
	genlmsg_end(skb, hdr);
	if (i != dpipe_headers->headers_count)
		goto start_again;

send_done:
	nlh = nlmsg_put(skb, info->snd_portid, info->snd_seq,
			NLMSG_DONE, 0, flags | NLM_F_MULTI);
	if (!nlh) {
		err = devlink_dpipe_send_and_alloc_skb(&skb, info);
		if (err)
			return err;
		goto send_done;
	}
	return genlmsg_reply(skb, info);

nla_put_failure:
	err = -EMSGSIZE;
err_table_put:
	nlmsg_free(skb);
	return err;
}

int devlink_nl_dpipe_headers_get_doit(struct sk_buff *skb,
				      struct genl_info *info)
{
	struct devlink *devlink = info->user_ptr[0];

	if (!devlink->dpipe_headers)
		return -EOPNOTSUPP;
	return devlink_dpipe_headers_fill(info, DEVLINK_CMD_DPIPE_HEADERS_GET,
					  0, devlink->dpipe_headers);
}

static int devlink_dpipe_table_counters_set(struct devlink *devlink,
					    const char *table_name,
					    bool enable)
{
	struct devlink_dpipe_table *table;

	table = devlink_dpipe_table_find(&devlink->dpipe_table_list,
					 table_name, devlink);
	if (!table)
		return -EINVAL;

	if (table->counter_control_extern)
		return -EOPNOTSUPP;

	if (!(table->counters_enabled ^ enable))
		return 0;

	table->counters_enabled = enable;
	if (table->table_ops->counters_set_update)
		table->table_ops->counters_set_update(table->priv, enable);
	return 0;
}

int devlink_nl_dpipe_table_counters_set_doit(struct sk_buff *skb,
					     struct genl_info *info)
{
	struct devlink *devlink = info->user_ptr[0];
	const char *table_name;
	bool counters_enable;

	if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_DPIPE_TABLE_NAME) ||
	    GENL_REQ_ATTR_CHECK(info,
				DEVLINK_ATTR_DPIPE_TABLE_COUNTERS_ENABLED))
		return -EINVAL;

	table_name = nla_data(info->attrs[DEVLINK_ATTR_DPIPE_TABLE_NAME]);
	counters_enable = !!nla_get_u8(info->attrs[DEVLINK_ATTR_DPIPE_TABLE_COUNTERS_ENABLED]);

	return devlink_dpipe_table_counters_set(devlink, table_name,
						counters_enable);
}

/**
 * devl_dpipe_headers_register - register dpipe headers
 *
 * @devlink: devlink
 * @dpipe_headers: dpipe header array
 *
 * Register the headers supported by hardware.
 */
void devl_dpipe_headers_register(struct devlink *devlink,
				 struct devlink_dpipe_headers *dpipe_headers)
{
	lockdep_assert_held(&devlink->lock);

	devlink->dpipe_headers = dpipe_headers;
}
EXPORT_SYMBOL_GPL(devl_dpipe_headers_register);

/**
 * devl_dpipe_headers_unregister - unregister dpipe headers
 *
 * @devlink: devlink
 *
 * Unregister the headers supported by hardware.
 */
void devl_dpipe_headers_unregister(struct devlink *devlink)
{
	lockdep_assert_held(&devlink->lock);

	devlink->dpipe_headers = NULL;
}
EXPORT_SYMBOL_GPL(devl_dpipe_headers_unregister);

/**
 *	devlink_dpipe_table_counter_enabled - check if counter allocation
 *					      required
 *	@devlink: devlink
 *	@table_name: tables name
 *
 *	Used by driver to check if counter allocation is required.
 *	After counter allocation is turned on the table entries
 *	are updated to include counter statistics.
 *
 *	After that point on the driver must respect the counter
 *	state so that each entry added to the table is added
 *	with a counter.
 */
bool devlink_dpipe_table_counter_enabled(struct devlink *devlink,
					 const char *table_name)
{
	struct devlink_dpipe_table *table;
	bool enabled;

	rcu_read_lock();
	table = devlink_dpipe_table_find(&devlink->dpipe_table_list,
					 table_name, devlink);
	enabled = false;
	if (table)
		enabled = table->counters_enabled;
	rcu_read_unlock();
	return enabled;
}
EXPORT_SYMBOL_GPL(devlink_dpipe_table_counter_enabled);

/**
 * devl_dpipe_table_register - register dpipe table
 *
 * @devlink: devlink
 * @table_name: table name
 * @table_ops: table ops
 * @priv: priv
 * @counter_control_extern: external control for counters
 */
int devl_dpipe_table_register(struct devlink *devlink,
			      const char *table_name,
			      const struct devlink_dpipe_table_ops *table_ops,
			      void *priv, bool counter_control_extern)
{
	struct devlink_dpipe_table *table;

	lockdep_assert_held(&devlink->lock);

	if (WARN_ON(!table_ops->size_get))
		return -EINVAL;

	if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name,
				     devlink))
		return -EEXIST;

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
		return -ENOMEM;

	table->name = table_name;
	table->table_ops = table_ops;
	table->priv = priv;
	table->counter_control_extern = counter_control_extern;

	list_add_tail_rcu(&table->list, &devlink->dpipe_table_list);

	return 0;
}
EXPORT_SYMBOL_GPL(devl_dpipe_table_register);

/**
 * devl_dpipe_table_unregister - unregister dpipe table
 *
 * @devlink: devlink
 * @table_name: table name
 */
void devl_dpipe_table_unregister(struct devlink *devlink,
				 const char *table_name)
{
	struct devlink_dpipe_table *table;

	lockdep_assert_held(&devlink->lock);

	table = devlink_dpipe_table_find(&devlink->dpipe_table_list,
					 table_name, devlink);
	if (!table)
		return;
	list_del_rcu(&table->list);
	kfree_rcu(table, rcu);
}
EXPORT_SYMBOL_GPL(devl_dpipe_table_unregister);

/**
 * devl_dpipe_table_resource_set - set the resource id
 *
 * @devlink: devlink
 * @table_name: table name
 * @resource_id: resource id
 * @resource_units: number of resource's units consumed per table's entry
 */
int devl_dpipe_table_resource_set(struct devlink *devlink,
				  const char *table_name, u64 resource_id,
				  u64 resource_units)
{
	struct devlink_dpipe_table *table;

	table = devlink_dpipe_table_find(&devlink->dpipe_table_list,
					 table_name, devlink);
	if (!table)
		return -EINVAL;

	table->resource_id = resource_id;
	table->resource_units = resource_units;
	table->resource_valid = true;
	return 0;
}
EXPORT_SYMBOL_GPL(devl_dpipe_table_resource_set);