/* 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 <linux/etherdevice.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/xarray.h>
#include <net/devlink.h>
#include <net/net_namespace.h>
#include <net/rtnetlink.h>
#include <rdma/ib_verbs.h>

#include "netlink_gen.h"

#define DEVLINK_REGISTERED XA_MARK_1

#define DEVLINK_RELOAD_STATS_ARRAY_SIZE \
	(__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX)

struct devlink_dev_stats {
	u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
	u32 remote_reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
};

struct devlink {
	u32 index;
	struct xarray ports;
	struct list_head rate_list;
	struct list_head sb_list;
	struct list_head dpipe_table_list;
	struct list_head resource_list;
	struct xarray params;
	struct list_head region_list;
	struct list_head reporter_list;
	struct devlink_dpipe_headers *dpipe_headers;
	struct list_head trap_list;
	struct list_head trap_group_list;
	struct list_head trap_policer_list;
	struct list_head linecard_list;
	const struct devlink_ops *ops;
	struct xarray snapshot_ids;
	struct devlink_dev_stats stats;
	struct device *dev;
	possible_net_t _net;
	/* Serializes access to devlink instance specific objects such as
	 * port, sb, dpipe, resource, params, region, traps and more.
	 */
	struct mutex lock;
	struct lock_class_key lock_key;
	u8 reload_failed:1;
	refcount_t refcount;
	struct rcu_work rwork;
	char priv[] __aligned(NETDEV_ALIGN);
};

extern struct xarray devlinks;
extern struct genl_family devlink_nl_family;

/* devlink instances are open to the access from the user space after
 * devlink_register() call. Such logical barrier allows us to have certain
 * expectations related to locking.
 *
 * Before *_register() - we are in initialization stage and no parallel
 * access possible to the devlink instance. All drivers perform that phase
 * by implicitly holding device_lock.
 *
 * After *_register() - users and driver can access devlink instance at
 * the same time.
 */
#define ASSERT_DEVLINK_REGISTERED(d)                                           \
	WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
#define ASSERT_DEVLINK_NOT_REGISTERED(d)                                       \
	WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))

/* Iterate over devlink pointers which were possible to get reference to.
 * devlink_put() needs to be called for each iterated devlink pointer
 * in loop body in order to release the reference.
 */
#define devlinks_xa_for_each_registered_get(net, index, devlink)	\
	for (index = 0; (devlink = devlinks_xa_find_get(net, &index)); index++)

struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp);

static inline bool devl_is_registered(struct devlink *devlink)
{
	devl_assert_locked(devlink);
	return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
}

/* Netlink */
#define DEVLINK_NL_FLAG_NEED_PORT		BIT(0)
#define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT	BIT(1)

enum devlink_multicast_groups {
	DEVLINK_MCGRP_CONFIG,
};

/* state held across netlink dumps */
struct devlink_nl_dump_state {
	unsigned long instance;
	int idx;
	union {
		/* DEVLINK_CMD_REGION_READ */
		struct {
			u64 start_offset;
		};
		/* DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET */
		struct {
			u64 dump_ts;
		};
	};
};

typedef int devlink_nl_dump_one_func_t(struct sk_buff *msg,
				       struct devlink *devlink,
				       struct netlink_callback *cb,
				       int flags);

struct devlink *
devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs);

int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb,
		      devlink_nl_dump_one_func_t *dump_one);

static inline struct devlink_nl_dump_state *
devlink_dump_state(struct netlink_callback *cb)
{
	NL_ASSERT_DUMP_CTX_FITS(struct devlink_nl_dump_state);

	return (struct devlink_nl_dump_state *)cb->ctx;
}

static inline int
devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
{
	if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name))
		return -EMSGSIZE;
	if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev)))
		return -EMSGSIZE;
	return 0;
}

int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info);

/* Notify */
void devlink_notify_register(struct devlink *devlink);
void devlink_notify_unregister(struct devlink *devlink);
void devlink_ports_notify_register(struct devlink *devlink);
void devlink_ports_notify_unregister(struct devlink *devlink);
void devlink_params_notify_register(struct devlink *devlink);
void devlink_params_notify_unregister(struct devlink *devlink);
void devlink_regions_notify_register(struct devlink *devlink);
void devlink_regions_notify_unregister(struct devlink *devlink);
void devlink_trap_policers_notify_register(struct devlink *devlink);
void devlink_trap_policers_notify_unregister(struct devlink *devlink);
void devlink_trap_groups_notify_register(struct devlink *devlink);
void devlink_trap_groups_notify_unregister(struct devlink *devlink);
void devlink_traps_notify_register(struct devlink *devlink);
void devlink_traps_notify_unregister(struct devlink *devlink);
void devlink_rates_notify_register(struct devlink *devlink);
void devlink_rates_notify_unregister(struct devlink *devlink);
void devlink_linecards_notify_register(struct devlink *devlink);
void devlink_linecards_notify_unregister(struct devlink *devlink);

/* Ports */
#define ASSERT_DEVLINK_PORT_INITIALIZED(devlink_port)				\
	WARN_ON_ONCE(!(devlink_port)->initialized)

struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
					       unsigned int port_index);
int devlink_port_netdevice_event(struct notifier_block *nb,
				 unsigned long event, void *ptr);
struct devlink_port *
devlink_port_get_from_info(struct devlink *devlink, struct genl_info *info);
struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
						 struct nlattr **attrs);

/* Reload */
bool devlink_reload_actions_valid(const struct devlink_ops *ops);
int devlink_reload(struct devlink *devlink, struct net *dest_net,
		   enum devlink_reload_action action,
		   enum devlink_reload_limit limit,
		   u32 *actions_performed, struct netlink_ext_ack *extack);

static inline bool devlink_reload_supported(const struct devlink_ops *ops)
{
	return ops->reload_down && ops->reload_up;
}

/* Params */
void devlink_params_driverinit_load_new(struct devlink *devlink);

/* Resources */
struct devlink_resource;
int devlink_resources_validate(struct devlink *devlink,
			       struct devlink_resource *resource,
			       struct genl_info *info);

/* Rates */
int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
			     struct netlink_ext_ack *extack);

/* Linecards */
struct devlink_linecard {
	struct list_head list;
	struct devlink *devlink;
	unsigned int index;
	const struct devlink_linecard_ops *ops;
	void *priv;
	enum devlink_linecard_state state;
	struct mutex state_lock; /* Protects state */
	const char *type;
	struct devlink_linecard_type *types;
	unsigned int types_count;
	struct devlink *nested_devlink;
};

/* Devlink nl cmds */
int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_eswitch_get_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_eswitch_set_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_flash_update(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_selftests_run(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_port_set_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_port_split_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_port_unsplit_doit(struct sk_buff *skb,
				     struct genl_info *info);
int devlink_nl_cmd_port_new_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_port_del_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_sb_pool_set_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_sb_port_pool_set_doit(struct sk_buff *skb,
					 struct genl_info *info);
int devlink_nl_cmd_sb_tc_pool_bind_set_doit(struct sk_buff *skb,
					    struct genl_info *info);
int devlink_nl_cmd_sb_occ_snapshot_doit(struct sk_buff *skb,
					struct genl_info *info);
int devlink_nl_cmd_sb_occ_max_clear_doit(struct sk_buff *skb,
					 struct genl_info *info);
int devlink_nl_cmd_dpipe_table_get(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_dpipe_entries_get(struct sk_buff *skb,
				     struct genl_info *info);
int devlink_nl_cmd_dpipe_headers_get(struct sk_buff *skb,
				     struct genl_info *info);
int devlink_nl_cmd_dpipe_table_counters_set(struct sk_buff *skb,
					    struct genl_info *info);
int devlink_nl_cmd_resource_set(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_resource_dump(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_param_set_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_port_param_get_dumpit(struct sk_buff *msg,
					 struct netlink_callback *cb);
int devlink_nl_cmd_port_param_get_doit(struct sk_buff *skb,
				       struct genl_info *info);
int devlink_nl_cmd_port_param_set_doit(struct sk_buff *skb,
				       struct genl_info *info);
int devlink_nl_cmd_region_new(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_region_del(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
				      struct netlink_callback *cb);
int devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
					    struct genl_info *info);
int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb,
						struct genl_info *info);
int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
						 struct genl_info *info);
int devlink_nl_cmd_health_reporter_dump_get_dumpit(struct sk_buff *skb,
						   struct netlink_callback *cb);
int devlink_nl_cmd_health_reporter_dump_clear_doit(struct sk_buff *skb,
						   struct genl_info *info);
int devlink_nl_cmd_health_reporter_test_doit(struct sk_buff *skb,
					     struct genl_info *info);
int devlink_nl_cmd_trap_set_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_trap_group_set_doit(struct sk_buff *skb,
				       struct genl_info *info);
int devlink_nl_cmd_trap_policer_set_doit(struct sk_buff *skb,
					 struct genl_info *info);
int devlink_nl_cmd_rate_set_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_rate_new_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_rate_del_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_cmd_linecard_set_doit(struct sk_buff *skb,
				     struct genl_info *info);